Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * PACKET - implements raw packet sockets. |
| 7 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 8 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> |
| 11 | * |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 12 | * Fixes: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * Alan Cox : verify_area() now used correctly |
| 14 | * Alan Cox : new skbuff lists, look ma no backlogs! |
| 15 | * Alan Cox : tidied skbuff lists. |
| 16 | * Alan Cox : Now uses generic datagram routines I |
| 17 | * added. Also fixed the peek/read crash |
| 18 | * from all old Linux datagram code. |
| 19 | * Alan Cox : Uses the improved datagram code. |
| 20 | * Alan Cox : Added NULL's for socket options. |
| 21 | * Alan Cox : Re-commented the code. |
| 22 | * Alan Cox : Use new kernel side addressing |
| 23 | * Rob Janssen : Correct MTU usage. |
| 24 | * Dave Platt : Counter leaks caused by incorrect |
| 25 | * interrupt locking and some slightly |
| 26 | * dubious gcc output. Can you read |
| 27 | * compiler: it said _VOLATILE_ |
| 28 | * Richard Kooijman : Timestamp fixes. |
| 29 | * Alan Cox : New buffers. Use sk->mac.raw. |
| 30 | * Alan Cox : sendmsg/recvmsg support. |
| 31 | * Alan Cox : Protocol setting support |
| 32 | * Alexey Kuznetsov : Untied from IPv4 stack. |
| 33 | * Cyrus Durgin : Fixed kerneld for kmod. |
| 34 | * Michal Ostrowski : Module initialization cleanup. |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 35 | * Ulises Alonso : Frame number limit removal and |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | * packet_set_ring memory leak. |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 37 | * Eric Biederman : Allow for > 8 byte hardware addresses. |
| 38 | * The convention is that longer addresses |
| 39 | * will simply extend the hardware address |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 40 | * byte arrays at the end of sockaddr_ll |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 41 | * and packet_mreq. |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 42 | * Johann Baudy : Added TX RING. |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 43 | * Chetan Loke : Implemented TPACKET_V3 block abstraction |
| 44 | * layer. |
| 45 | * Copyright (C) 2011, <lokec@ccs.neu.edu> |
| 46 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | * |
| 48 | * This program is free software; you can redistribute it and/or |
| 49 | * modify it under the terms of the GNU General Public License |
| 50 | * as published by the Free Software Foundation; either version |
| 51 | * 2 of the License, or (at your option) any later version. |
| 52 | * |
| 53 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | #include <linux/mm.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 57 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | #include <linux/fcntl.h> |
| 59 | #include <linux/socket.h> |
| 60 | #include <linux/in.h> |
| 61 | #include <linux/inet.h> |
| 62 | #include <linux/netdevice.h> |
| 63 | #include <linux/if_packet.h> |
| 64 | #include <linux/wireless.h> |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 65 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #include <linux/kmod.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 67 | #include <linux/slab.h> |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 68 | #include <linux/vmalloc.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 69 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | #include <net/ip.h> |
| 71 | #include <net/protocol.h> |
| 72 | #include <linux/skbuff.h> |
| 73 | #include <net/sock.h> |
| 74 | #include <linux/errno.h> |
| 75 | #include <linux/timer.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | #include <asm/uaccess.h> |
| 77 | #include <asm/ioctls.h> |
| 78 | #include <asm/page.h> |
Al Viro | a1f8e7f7 | 2006-10-19 16:08:53 -0400 | [diff] [blame] | 79 | #include <asm/cacheflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | #include <asm/io.h> |
| 81 | #include <linux/proc_fs.h> |
| 82 | #include <linux/seq_file.h> |
| 83 | #include <linux/poll.h> |
| 84 | #include <linux/module.h> |
| 85 | #include <linux/init.h> |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 86 | #include <linux/mutex.h> |
Eric Dumazet | 05423b2 | 2009-10-26 18:40:35 -0700 | [diff] [blame] | 87 | #include <linux/if_vlan.h> |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 88 | #include <linux/virtio_net.h> |
Richard Cochran | ed85b56 | 2010-04-07 22:41:28 +0000 | [diff] [blame] | 89 | #include <linux/errqueue.h> |
Scott McMillan | 614f60f | 2010-06-02 05:53:56 -0700 | [diff] [blame] | 90 | #include <linux/net_tstamp.h> |
Daniel Borkmann | b013840 | 2014-01-15 16:25:36 +0100 | [diff] [blame] | 91 | #include <linux/percpu.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | #ifdef CONFIG_INET |
| 93 | #include <net/inet_common.h> |
| 94 | #endif |
Willem de Bruijn | 47dceb8 | 2015-08-14 22:31:34 -0400 | [diff] [blame] | 95 | #include <linux/bpf.h> |
Willem de Bruijn | 719c44d | 2016-06-07 12:06:34 -0400 | [diff] [blame] | 96 | #include <net/compat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Pavel Emelyanov | 2787b04 | 2012-08-13 05:49:39 +0000 | [diff] [blame] | 98 | #include "internal.h" |
| 99 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | Assumptions: |
| 102 | - if device has no dev->hard_header routine, it adds and removes ll header |
| 103 | inside itself. In this case ll header is invisible outside of device, |
| 104 | but higher levels still should reserve dev->hard_header_len. |
| 105 | Some devices are enough clever to reallocate skb, when header |
| 106 | will not fit to reserved space (tunnel), another ones are silly |
| 107 | (PPP). |
| 108 | - packet socket receives packets with pulled ll header, |
| 109 | so that SOCK_RAW should push it back. |
| 110 | |
| 111 | On receive: |
| 112 | ----------- |
| 113 | |
| 114 | Incoming, dev->hard_header!=NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 115 | mac_header -> ll header |
| 116 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | |
| 118 | Outgoing, dev->hard_header!=NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 119 | mac_header -> ll header |
| 120 | data -> ll header |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
| 122 | Incoming, dev->hard_header==NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 123 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
| 124 | header. PPP makes it, that is wrong, because introduce |
YOSHIFUJI Hideaki | db0c58f | 2007-07-19 10:44:35 +0900 | [diff] [blame] | 125 | assymetry between rx and tx paths. |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 126 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
| 128 | Outgoing, dev->hard_header==NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 129 | mac_header -> data. ll header is still not built! |
| 130 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
| 132 | Resume |
| 133 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. |
| 134 | |
| 135 | |
| 136 | On transmit: |
| 137 | ------------ |
| 138 | |
| 139 | dev->hard_header != NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 140 | mac_header -> ll header |
| 141 | data -> ll header |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
| 143 | dev->hard_header == NULL (ll header is added by device, we cannot control it) |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 144 | mac_header -> data |
| 145 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
| 147 | We should set nh.raw on output to correct posistion, |
| 148 | packet classifier depends on it. |
| 149 | */ |
| 150 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | /* Private packet socket structures. */ |
| 152 | |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 153 | /* identical to struct packet_mreq except it has |
| 154 | * a longer address field. |
| 155 | */ |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 156 | struct packet_mreq_max { |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 157 | int mr_ifindex; |
| 158 | unsigned short mr_type; |
| 159 | unsigned short mr_alen; |
| 160 | unsigned char mr_address[MAX_ADDR_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | }; |
David S. Miller | a2efcfa | 2007-05-29 13:12:50 -0700 | [diff] [blame] | 162 | |
Daniel Borkmann | 184f489 | 2013-04-16 01:57:46 +0000 | [diff] [blame] | 163 | union tpacket_uhdr { |
| 164 | struct tpacket_hdr *h1; |
| 165 | struct tpacket2_hdr *h2; |
| 166 | struct tpacket3_hdr *h3; |
| 167 | void *raw; |
| 168 | }; |
| 169 | |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 170 | static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u, |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 171 | int closing, int tx_ring); |
| 172 | |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 173 | #define V3_ALIGNMENT (8) |
| 174 | |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 175 | #define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT)) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 176 | |
| 177 | #define BLK_PLUS_PRIV(sz_of_priv) \ |
| 178 | (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT)) |
| 179 | |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 180 | #define PGV_FROM_VMALLOC 1 |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 181 | |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 182 | #define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status) |
| 183 | #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts) |
| 184 | #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt) |
| 185 | #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len) |
| 186 | #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num) |
| 187 | #define BLOCK_O2PRIV(x) ((x)->offset_to_priv) |
| 188 | #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x))) |
| 189 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 190 | struct packet_sock; |
| 191 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg); |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 192 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
| 193 | struct packet_type *pt, struct net_device *orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 195 | static void *packet_previous_frame(struct packet_sock *po, |
| 196 | struct packet_ring_buffer *rb, |
| 197 | int status); |
| 198 | static void packet_increment_head(struct packet_ring_buffer *buff); |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 199 | static int prb_curr_blk_in_use(struct tpacket_kbdq_core *, |
| 200 | struct tpacket_block_desc *); |
| 201 | static void *prb_dispatch_next_block(struct tpacket_kbdq_core *, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 202 | struct packet_sock *); |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 203 | static void prb_retire_current_block(struct tpacket_kbdq_core *, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 204 | struct packet_sock *, unsigned int status); |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 205 | static int prb_queue_frozen(struct tpacket_kbdq_core *); |
| 206 | static void prb_open_block(struct tpacket_kbdq_core *, |
| 207 | struct tpacket_block_desc *); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 208 | static void prb_retire_rx_blk_timer_expired(unsigned long); |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 209 | static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *); |
| 210 | static void prb_init_blk_timer(struct packet_sock *, |
| 211 | struct tpacket_kbdq_core *, |
| 212 | void (*func) (unsigned long)); |
| 213 | static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *); |
| 214 | static void prb_clear_rxhash(struct tpacket_kbdq_core *, |
| 215 | struct tpacket3_hdr *); |
| 216 | static void prb_fill_vlan_info(struct tpacket_kbdq_core *, |
| 217 | struct tpacket3_hdr *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | static void packet_flush_mclist(struct sock *sk); |
| 219 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 220 | struct packet_skb_cb { |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 221 | union { |
| 222 | struct sockaddr_pkt pkt; |
Eyal Birger | 2472d76 | 2015-03-01 14:58:28 +0200 | [diff] [blame] | 223 | union { |
| 224 | /* Trick: alias skb original length with |
| 225 | * ll.sll_family and ll.protocol in order |
| 226 | * to save room. |
| 227 | */ |
| 228 | unsigned int origlen; |
| 229 | struct sockaddr_ll ll; |
| 230 | }; |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 231 | } sa; |
| 232 | }; |
| 233 | |
David Woodhouse | d3869ef | 2015-09-23 19:45:08 +0100 | [diff] [blame] | 234 | #define vio_le() virtio_legacy_is_little_endian() |
| 235 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 236 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 237 | |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 238 | #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc)) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 239 | #define GET_PBLOCK_DESC(x, bid) \ |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 240 | ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer)) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 241 | #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \ |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 242 | ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer)) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 243 | #define GET_NEXT_PRB_BLK_NUM(x) \ |
| 244 | (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \ |
| 245 | ((x)->kactive_blk_num+1) : 0) |
| 246 | |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 247 | static void __fanout_unlink(struct sock *sk, struct packet_sock *po); |
| 248 | static void __fanout_link(struct sock *sk, struct packet_sock *po); |
| 249 | |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 250 | static int packet_direct_xmit(struct sk_buff *skb) |
| 251 | { |
| 252 | struct net_device *dev = skb->dev; |
Willem de Bruijn | 104ba78 | 2016-10-26 11:23:07 -0400 | [diff] [blame] | 253 | struct sk_buff *orig_skb = skb; |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 254 | struct netdev_queue *txq; |
Daniel Borkmann | 4327950 | 2014-03-27 16:38:30 +0100 | [diff] [blame] | 255 | int ret = NETDEV_TX_BUSY; |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 256 | |
| 257 | if (unlikely(!netif_running(dev) || |
Daniel Borkmann | 4327950 | 2014-03-27 16:38:30 +0100 | [diff] [blame] | 258 | !netif_carrier_ok(dev))) |
| 259 | goto drop; |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 260 | |
Willem de Bruijn | 104ba78 | 2016-10-26 11:23:07 -0400 | [diff] [blame] | 261 | skb = validate_xmit_skb_list(skb, dev); |
| 262 | if (skb != orig_skb) |
Daniel Borkmann | 4327950 | 2014-03-27 16:38:30 +0100 | [diff] [blame] | 263 | goto drop; |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 264 | |
Daniel Borkmann | 10c51b5623 | 2014-08-27 11:11:27 +0200 | [diff] [blame] | 265 | txq = skb_get_tx_queue(dev, skb); |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 266 | |
Daniel Borkmann | 4327950 | 2014-03-27 16:38:30 +0100 | [diff] [blame] | 267 | local_bh_disable(); |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 268 | |
Daniel Borkmann | 4327950 | 2014-03-27 16:38:30 +0100 | [diff] [blame] | 269 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
David S. Miller | 10b3ad8 | 2014-08-29 21:07:24 -0700 | [diff] [blame] | 270 | if (!netif_xmit_frozen_or_drv_stopped(txq)) |
David S. Miller | fa2dbdc | 2014-08-29 21:55:22 -0700 | [diff] [blame] | 271 | ret = netdev_start_xmit(skb, dev, txq, false); |
Daniel Borkmann | 4327950 | 2014-03-27 16:38:30 +0100 | [diff] [blame] | 272 | HARD_TX_UNLOCK(dev, txq); |
| 273 | |
| 274 | local_bh_enable(); |
| 275 | |
| 276 | if (!dev_xmit_complete(ret)) |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 277 | kfree_skb(skb); |
Daniel Borkmann | 4327950 | 2014-03-27 16:38:30 +0100 | [diff] [blame] | 278 | |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 279 | return ret; |
Daniel Borkmann | 4327950 | 2014-03-27 16:38:30 +0100 | [diff] [blame] | 280 | drop: |
Daniel Borkmann | 0f97ede | 2014-04-02 20:52:56 +0200 | [diff] [blame] | 281 | atomic_long_inc(&dev->tx_dropped); |
Willem de Bruijn | 104ba78 | 2016-10-26 11:23:07 -0400 | [diff] [blame] | 282 | kfree_skb_list(skb); |
Daniel Borkmann | 4327950 | 2014-03-27 16:38:30 +0100 | [diff] [blame] | 283 | return NET_XMIT_DROP; |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 284 | } |
| 285 | |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 286 | static struct net_device *packet_cached_dev_get(struct packet_sock *po) |
| 287 | { |
| 288 | struct net_device *dev; |
| 289 | |
| 290 | rcu_read_lock(); |
| 291 | dev = rcu_dereference(po->cached_dev); |
| 292 | if (likely(dev)) |
| 293 | dev_hold(dev); |
| 294 | rcu_read_unlock(); |
| 295 | |
| 296 | return dev; |
| 297 | } |
| 298 | |
| 299 | static void packet_cached_dev_assign(struct packet_sock *po, |
| 300 | struct net_device *dev) |
| 301 | { |
| 302 | rcu_assign_pointer(po->cached_dev, dev); |
| 303 | } |
| 304 | |
| 305 | static void packet_cached_dev_reset(struct packet_sock *po) |
| 306 | { |
| 307 | RCU_INIT_POINTER(po->cached_dev, NULL); |
| 308 | } |
| 309 | |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 310 | static bool packet_use_direct_xmit(const struct packet_sock *po) |
| 311 | { |
| 312 | return po->xmit == packet_direct_xmit; |
| 313 | } |
| 314 | |
Daniel Borkmann | 0fd5d57 | 2014-02-16 15:55:22 +0100 | [diff] [blame] | 315 | static u16 __packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb) |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 316 | { |
Li Zhong | 1cbac01 | 2013-12-12 22:39:55 +0100 | [diff] [blame] | 317 | return (u16) raw_smp_processor_id() % dev->real_num_tx_queues; |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 318 | } |
| 319 | |
Daniel Borkmann | 0fd5d57 | 2014-02-16 15:55:22 +0100 | [diff] [blame] | 320 | static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb) |
| 321 | { |
| 322 | const struct net_device_ops *ops = dev->netdev_ops; |
| 323 | u16 queue_index; |
| 324 | |
| 325 | if (ops->ndo_select_queue) { |
| 326 | queue_index = ops->ndo_select_queue(dev, skb, NULL, |
| 327 | __packet_pick_tx_queue); |
| 328 | queue_index = netdev_cap_txqueue(dev, queue_index); |
| 329 | } else { |
| 330 | queue_index = __packet_pick_tx_queue(dev, skb); |
| 331 | } |
| 332 | |
| 333 | skb_set_queue_mapping(skb, queue_index); |
| 334 | } |
| 335 | |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 336 | /* register_prot_hook must be invoked with the po->bind_lock held, |
| 337 | * or from a context in which asynchronous accesses to the packet |
| 338 | * socket is not possible (packet_create()). |
| 339 | */ |
| 340 | static void register_prot_hook(struct sock *sk) |
| 341 | { |
| 342 | struct packet_sock *po = pkt_sk(sk); |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 343 | |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 344 | if (!po->running) { |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 345 | if (po->fanout) |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 346 | __fanout_link(sk, po); |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 347 | else |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 348 | dev_add_pack(&po->prot_hook); |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 349 | |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 350 | sock_hold(sk); |
| 351 | po->running = 1; |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | /* {,__}unregister_prot_hook() must be invoked with the po->bind_lock |
| 356 | * held. If the sync parameter is true, we will temporarily drop |
| 357 | * the po->bind_lock and do a synchronize_net to make sure no |
| 358 | * asynchronous packet processing paths still refer to the elements |
| 359 | * of po->prot_hook. If the sync parameter is false, it is the |
| 360 | * callers responsibility to take care of this. |
| 361 | */ |
| 362 | static void __unregister_prot_hook(struct sock *sk, bool sync) |
| 363 | { |
| 364 | struct packet_sock *po = pkt_sk(sk); |
| 365 | |
| 366 | po->running = 0; |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 367 | |
| 368 | if (po->fanout) |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 369 | __fanout_unlink(sk, po); |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 370 | else |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 371 | __dev_remove_pack(&po->prot_hook); |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 372 | |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 373 | __sock_put(sk); |
| 374 | |
| 375 | if (sync) { |
| 376 | spin_unlock(&po->bind_lock); |
| 377 | synchronize_net(); |
| 378 | spin_lock(&po->bind_lock); |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | static void unregister_prot_hook(struct sock *sk, bool sync) |
| 383 | { |
| 384 | struct packet_sock *po = pkt_sk(sk); |
| 385 | |
| 386 | if (po->running) |
| 387 | __unregister_prot_hook(sk, sync); |
| 388 | } |
| 389 | |
Michael S. Tsirkin | 6e58040 | 2014-11-24 13:32:16 +0200 | [diff] [blame] | 390 | static inline struct page * __pure pgv_to_page(void *addr) |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 391 | { |
| 392 | if (is_vmalloc_addr(addr)) |
| 393 | return vmalloc_to_page(addr); |
| 394 | return virt_to_page(addr); |
| 395 | } |
| 396 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 397 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
| 398 | { |
Daniel Borkmann | 184f489 | 2013-04-16 01:57:46 +0000 | [diff] [blame] | 399 | union tpacket_uhdr h; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 400 | |
| 401 | h.raw = frame; |
| 402 | switch (po->tp_version) { |
| 403 | case TPACKET_V1: |
| 404 | h.h1->tp_status = status; |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 405 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 406 | break; |
| 407 | case TPACKET_V2: |
| 408 | h.h2->tp_status = status; |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 409 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 410 | break; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 411 | case TPACKET_V3: |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 412 | default: |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 413 | WARN(1, "TPACKET version not supported.\n"); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 414 | BUG(); |
| 415 | } |
| 416 | |
| 417 | smp_wmb(); |
| 418 | } |
| 419 | |
| 420 | static int __packet_get_status(struct packet_sock *po, void *frame) |
| 421 | { |
Daniel Borkmann | 184f489 | 2013-04-16 01:57:46 +0000 | [diff] [blame] | 422 | union tpacket_uhdr h; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 423 | |
| 424 | smp_rmb(); |
| 425 | |
| 426 | h.raw = frame; |
| 427 | switch (po->tp_version) { |
| 428 | case TPACKET_V1: |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 429 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 430 | return h.h1->tp_status; |
| 431 | case TPACKET_V2: |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 432 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 433 | return h.h2->tp_status; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 434 | case TPACKET_V3: |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 435 | default: |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 436 | WARN(1, "TPACKET version not supported.\n"); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 437 | BUG(); |
| 438 | return 0; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 439 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 441 | |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 442 | static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts, |
| 443 | unsigned int flags) |
Daniel Borkmann | 7a51384 | 2013-04-23 00:39:29 +0000 | [diff] [blame] | 444 | { |
| 445 | struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb); |
| 446 | |
Willem de Bruijn | 68a360e | 2014-07-25 18:01:31 -0400 | [diff] [blame] | 447 | if (shhwtstamps && |
| 448 | (flags & SOF_TIMESTAMPING_RAW_HARDWARE) && |
| 449 | ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts)) |
| 450 | return TP_STATUS_TS_RAW_HARDWARE; |
Daniel Borkmann | 7a51384 | 2013-04-23 00:39:29 +0000 | [diff] [blame] | 451 | |
| 452 | if (ktime_to_timespec_cond(skb->tstamp, ts)) |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 453 | return TP_STATUS_TS_SOFTWARE; |
Daniel Borkmann | 7a51384 | 2013-04-23 00:39:29 +0000 | [diff] [blame] | 454 | |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 455 | return 0; |
Daniel Borkmann | 7a51384 | 2013-04-23 00:39:29 +0000 | [diff] [blame] | 456 | } |
| 457 | |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 458 | static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame, |
| 459 | struct sk_buff *skb) |
Willem de Bruijn | 2e31396 | 2013-04-23 00:39:28 +0000 | [diff] [blame] | 460 | { |
| 461 | union tpacket_uhdr h; |
| 462 | struct timespec ts; |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 463 | __u32 ts_status; |
Willem de Bruijn | 2e31396 | 2013-04-23 00:39:28 +0000 | [diff] [blame] | 464 | |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 465 | if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp))) |
| 466 | return 0; |
Willem de Bruijn | 2e31396 | 2013-04-23 00:39:28 +0000 | [diff] [blame] | 467 | |
| 468 | h.raw = frame; |
| 469 | switch (po->tp_version) { |
| 470 | case TPACKET_V1: |
| 471 | h.h1->tp_sec = ts.tv_sec; |
| 472 | h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC; |
| 473 | break; |
| 474 | case TPACKET_V2: |
| 475 | h.h2->tp_sec = ts.tv_sec; |
| 476 | h.h2->tp_nsec = ts.tv_nsec; |
| 477 | break; |
| 478 | case TPACKET_V3: |
| 479 | default: |
| 480 | WARN(1, "TPACKET version not supported.\n"); |
| 481 | BUG(); |
| 482 | } |
| 483 | |
| 484 | /* one flush is safe, as both fields always lie on the same cacheline */ |
| 485 | flush_dcache_page(pgv_to_page(&h.h1->tp_sec)); |
| 486 | smp_wmb(); |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 487 | |
| 488 | return ts_status; |
Willem de Bruijn | 2e31396 | 2013-04-23 00:39:28 +0000 | [diff] [blame] | 489 | } |
| 490 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 491 | static void *packet_lookup_frame(struct packet_sock *po, |
| 492 | struct packet_ring_buffer *rb, |
| 493 | unsigned int position, |
| 494 | int status) |
| 495 | { |
| 496 | unsigned int pg_vec_pos, frame_offset; |
Daniel Borkmann | 184f489 | 2013-04-16 01:57:46 +0000 | [diff] [blame] | 497 | union tpacket_uhdr h; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 498 | |
| 499 | pg_vec_pos = position / rb->frames_per_block; |
| 500 | frame_offset = position % rb->frames_per_block; |
| 501 | |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 502 | h.raw = rb->pg_vec[pg_vec_pos].buffer + |
| 503 | (frame_offset * rb->frame_size); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 504 | |
| 505 | if (status != __packet_get_status(po, h.raw)) |
| 506 | return NULL; |
| 507 | |
| 508 | return h.raw; |
| 509 | } |
| 510 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 511 | static void *packet_current_frame(struct packet_sock *po, |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 512 | struct packet_ring_buffer *rb, |
| 513 | int status) |
| 514 | { |
| 515 | return packet_lookup_frame(po, rb, rb->head, status); |
| 516 | } |
| 517 | |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 518 | static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 519 | { |
| 520 | del_timer_sync(&pkc->retire_blk_timer); |
| 521 | } |
| 522 | |
| 523 | static void prb_shutdown_retire_blk_timer(struct packet_sock *po, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 524 | struct sk_buff_head *rb_queue) |
| 525 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 526 | struct tpacket_kbdq_core *pkc; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 527 | |
Tobias Klauser | 73d0fcf | 2015-07-28 14:21:26 +0200 | [diff] [blame] | 528 | pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 529 | |
Veaceslav Falico | ec6f809 | 2013-11-29 09:53:23 +0100 | [diff] [blame] | 530 | spin_lock_bh(&rb_queue->lock); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 531 | pkc->delete_blk_timer = 1; |
Veaceslav Falico | ec6f809 | 2013-11-29 09:53:23 +0100 | [diff] [blame] | 532 | spin_unlock_bh(&rb_queue->lock); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 533 | |
| 534 | prb_del_retire_blk_timer(pkc); |
| 535 | } |
| 536 | |
| 537 | static void prb_init_blk_timer(struct packet_sock *po, |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 538 | struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 539 | void (*func) (unsigned long)) |
| 540 | { |
| 541 | init_timer(&pkc->retire_blk_timer); |
| 542 | pkc->retire_blk_timer.data = (long)po; |
| 543 | pkc->retire_blk_timer.function = func; |
| 544 | pkc->retire_blk_timer.expires = jiffies; |
| 545 | } |
| 546 | |
Maninder Singh | e8e85cc | 2015-06-22 12:39:16 +0530 | [diff] [blame] | 547 | static void prb_setup_retire_blk_timer(struct packet_sock *po) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 548 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 549 | struct tpacket_kbdq_core *pkc; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 550 | |
Maninder Singh | e8e85cc | 2015-06-22 12:39:16 +0530 | [diff] [blame] | 551 | pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 552 | prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired); |
| 553 | } |
| 554 | |
| 555 | static int prb_calc_retire_blk_tmo(struct packet_sock *po, |
| 556 | int blk_size_in_bytes) |
| 557 | { |
| 558 | struct net_device *dev; |
| 559 | unsigned int mbits = 0, msec = 0, div = 0, tmo = 0; |
David Decotigny | 7cad1ba | 2016-02-24 10:58:10 -0800 | [diff] [blame] | 560 | struct ethtool_link_ksettings ecmd; |
Jiri Pirko | 4bc71cb | 2011-09-03 03:34:30 +0000 | [diff] [blame] | 561 | int err; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 562 | |
Jiri Pirko | 4bc71cb | 2011-09-03 03:34:30 +0000 | [diff] [blame] | 563 | rtnl_lock(); |
| 564 | dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex); |
| 565 | if (unlikely(!dev)) { |
| 566 | rtnl_unlock(); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 567 | return DEFAULT_PRB_RETIRE_TOV; |
Jiri Pirko | 4bc71cb | 2011-09-03 03:34:30 +0000 | [diff] [blame] | 568 | } |
David Decotigny | 7cad1ba | 2016-02-24 10:58:10 -0800 | [diff] [blame] | 569 | err = __ethtool_get_link_ksettings(dev, &ecmd); |
Jiri Pirko | 4bc71cb | 2011-09-03 03:34:30 +0000 | [diff] [blame] | 570 | rtnl_unlock(); |
| 571 | if (!err) { |
Jiri Pirko | 4bc71cb | 2011-09-03 03:34:30 +0000 | [diff] [blame] | 572 | /* |
| 573 | * If the link speed is so slow you don't really |
| 574 | * need to worry about perf anyways |
| 575 | */ |
David Decotigny | 7cad1ba | 2016-02-24 10:58:10 -0800 | [diff] [blame] | 576 | if (ecmd.base.speed < SPEED_1000 || |
| 577 | ecmd.base.speed == SPEED_UNKNOWN) { |
Jiri Pirko | 4bc71cb | 2011-09-03 03:34:30 +0000 | [diff] [blame] | 578 | return DEFAULT_PRB_RETIRE_TOV; |
parav.pandit@emulex.com | e440cf2 | 2012-06-27 03:56:12 +0000 | [diff] [blame] | 579 | } else { |
| 580 | msec = 1; |
David Decotigny | 7cad1ba | 2016-02-24 10:58:10 -0800 | [diff] [blame] | 581 | div = ecmd.base.speed / 1000; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 582 | } |
| 583 | } |
| 584 | |
| 585 | mbits = (blk_size_in_bytes * 8) / (1024 * 1024); |
| 586 | |
| 587 | if (div) |
| 588 | mbits /= div; |
| 589 | |
| 590 | tmo = mbits * msec; |
| 591 | |
| 592 | if (div) |
| 593 | return tmo+1; |
| 594 | return tmo; |
| 595 | } |
| 596 | |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 597 | static void prb_init_ft_ops(struct tpacket_kbdq_core *p1, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 598 | union tpacket_req_u *req_u) |
| 599 | { |
| 600 | p1->feature_req_word = req_u->req3.tp_feature_req_word; |
| 601 | } |
| 602 | |
| 603 | static void init_prb_bdqc(struct packet_sock *po, |
| 604 | struct packet_ring_buffer *rb, |
| 605 | struct pgv *pg_vec, |
Maninder Singh | e8e85cc | 2015-06-22 12:39:16 +0530 | [diff] [blame] | 606 | union tpacket_req_u *req_u) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 607 | { |
Duan Jiong | 22781a5 | 2013-12-06 13:29:36 +0800 | [diff] [blame] | 608 | struct tpacket_kbdq_core *p1 = GET_PBDQC_FROM_RB(rb); |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 609 | struct tpacket_block_desc *pbd; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 610 | |
| 611 | memset(p1, 0x0, sizeof(*p1)); |
| 612 | |
| 613 | p1->knxt_seq_num = 1; |
| 614 | p1->pkbdq = pg_vec; |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 615 | pbd = (struct tpacket_block_desc *)pg_vec[0].buffer; |
Joe Perches | e319269 | 2012-06-03 17:41:40 +0000 | [diff] [blame] | 616 | p1->pkblk_start = pg_vec[0].buffer; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 617 | p1->kblk_size = req_u->req3.tp_block_size; |
| 618 | p1->knum_blocks = req_u->req3.tp_block_nr; |
| 619 | p1->hdrlen = po->tp_hdrlen; |
| 620 | p1->version = po->tp_version; |
| 621 | p1->last_kactive_blk_num = 0; |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 622 | po->stats.stats3.tp_freeze_q_cnt = 0; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 623 | if (req_u->req3.tp_retire_blk_tov) |
| 624 | p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov; |
| 625 | else |
| 626 | p1->retire_blk_tov = prb_calc_retire_blk_tmo(po, |
| 627 | req_u->req3.tp_block_size); |
| 628 | p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov); |
| 629 | p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv; |
| 630 | |
Eric Dumazet | dc80811 | 2014-08-15 09:16:04 -0700 | [diff] [blame] | 631 | p1->max_frame_len = p1->kblk_size - BLK_PLUS_PRIV(p1->blk_sizeof_priv); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 632 | prb_init_ft_ops(p1, req_u); |
Maninder Singh | e8e85cc | 2015-06-22 12:39:16 +0530 | [diff] [blame] | 633 | prb_setup_retire_blk_timer(po); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 634 | prb_open_block(p1, pbd); |
| 635 | } |
| 636 | |
| 637 | /* Do NOT update the last_blk_num first. |
| 638 | * Assumes sk_buff_head lock is held. |
| 639 | */ |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 640 | static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 641 | { |
| 642 | mod_timer(&pkc->retire_blk_timer, |
| 643 | jiffies + pkc->tov_in_jiffies); |
| 644 | pkc->last_kactive_blk_num = pkc->kactive_blk_num; |
| 645 | } |
| 646 | |
| 647 | /* |
| 648 | * Timer logic: |
| 649 | * 1) We refresh the timer only when we open a block. |
| 650 | * By doing this we don't waste cycles refreshing the timer |
| 651 | * on packet-by-packet basis. |
| 652 | * |
| 653 | * With a 1MB block-size, on a 1Gbps line, it will take |
| 654 | * i) ~8 ms to fill a block + ii) memcpy etc. |
| 655 | * In this cut we are not accounting for the memcpy time. |
| 656 | * |
| 657 | * So, if the user sets the 'tmo' to 10ms then the timer |
| 658 | * will never fire while the block is still getting filled |
| 659 | * (which is what we want). However, the user could choose |
| 660 | * to close a block early and that's fine. |
| 661 | * |
| 662 | * But when the timer does fire, we check whether or not to refresh it. |
| 663 | * Since the tmo granularity is in msecs, it is not too expensive |
| 664 | * to refresh the timer, lets say every '8' msecs. |
| 665 | * Either the user can set the 'tmo' or we can derive it based on |
| 666 | * a) line-speed and b) block-size. |
| 667 | * prb_calc_retire_blk_tmo() calculates the tmo. |
| 668 | * |
| 669 | */ |
| 670 | static void prb_retire_rx_blk_timer_expired(unsigned long data) |
| 671 | { |
| 672 | struct packet_sock *po = (struct packet_sock *)data; |
Duan Jiong | 22781a5 | 2013-12-06 13:29:36 +0800 | [diff] [blame] | 673 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 674 | unsigned int frozen; |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 675 | struct tpacket_block_desc *pbd; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 676 | |
| 677 | spin_lock(&po->sk.sk_receive_queue.lock); |
| 678 | |
| 679 | frozen = prb_queue_frozen(pkc); |
| 680 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
| 681 | |
| 682 | if (unlikely(pkc->delete_blk_timer)) |
| 683 | goto out; |
| 684 | |
| 685 | /* We only need to plug the race when the block is partially filled. |
| 686 | * tpacket_rcv: |
| 687 | * lock(); increment BLOCK_NUM_PKTS; unlock() |
| 688 | * copy_bits() is in progress ... |
| 689 | * timer fires on other cpu: |
| 690 | * we can't retire the current block because copy_bits |
| 691 | * is in progress. |
| 692 | * |
| 693 | */ |
| 694 | if (BLOCK_NUM_PKTS(pbd)) { |
| 695 | while (atomic_read(&pkc->blk_fill_in_prog)) { |
| 696 | /* Waiting for skb_copy_bits to finish... */ |
| 697 | cpu_relax(); |
| 698 | } |
| 699 | } |
| 700 | |
| 701 | if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) { |
| 702 | if (!frozen) { |
Alexander Drozdov | 41a50d6 | 2015-02-24 08:18:28 +0300 | [diff] [blame] | 703 | if (!BLOCK_NUM_PKTS(pbd)) { |
| 704 | /* An empty block. Just refresh the timer. */ |
| 705 | goto refresh_timer; |
| 706 | } |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 707 | prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO); |
| 708 | if (!prb_dispatch_next_block(pkc, po)) |
| 709 | goto refresh_timer; |
| 710 | else |
| 711 | goto out; |
| 712 | } else { |
| 713 | /* Case 1. Queue was frozen because user-space was |
| 714 | * lagging behind. |
| 715 | */ |
| 716 | if (prb_curr_blk_in_use(pkc, pbd)) { |
| 717 | /* |
| 718 | * Ok, user-space is still behind. |
| 719 | * So just refresh the timer. |
| 720 | */ |
| 721 | goto refresh_timer; |
| 722 | } else { |
| 723 | /* Case 2. queue was frozen,user-space caught up, |
| 724 | * now the link went idle && the timer fired. |
| 725 | * We don't have a block to close.So we open this |
| 726 | * block and restart the timer. |
| 727 | * opening a block thaws the queue,restarts timer |
| 728 | * Thawing/timer-refresh is a side effect. |
| 729 | */ |
| 730 | prb_open_block(pkc, pbd); |
| 731 | goto out; |
| 732 | } |
| 733 | } |
| 734 | } |
| 735 | |
| 736 | refresh_timer: |
| 737 | _prb_refresh_rx_retire_blk_timer(pkc); |
| 738 | |
| 739 | out: |
| 740 | spin_unlock(&po->sk.sk_receive_queue.lock); |
| 741 | } |
| 742 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 743 | static void prb_flush_block(struct tpacket_kbdq_core *pkc1, |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 744 | struct tpacket_block_desc *pbd1, __u32 status) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 745 | { |
| 746 | /* Flush everything minus the block header */ |
| 747 | |
| 748 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
| 749 | u8 *start, *end; |
| 750 | |
| 751 | start = (u8 *)pbd1; |
| 752 | |
| 753 | /* Skip the block header(we know header WILL fit in 4K) */ |
| 754 | start += PAGE_SIZE; |
| 755 | |
| 756 | end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end); |
| 757 | for (; start < end; start += PAGE_SIZE) |
| 758 | flush_dcache_page(pgv_to_page(start)); |
| 759 | |
| 760 | smp_wmb(); |
| 761 | #endif |
| 762 | |
| 763 | /* Now update the block status. */ |
| 764 | |
| 765 | BLOCK_STATUS(pbd1) = status; |
| 766 | |
| 767 | /* Flush the block header */ |
| 768 | |
| 769 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
| 770 | start = (u8 *)pbd1; |
| 771 | flush_dcache_page(pgv_to_page(start)); |
| 772 | |
| 773 | smp_wmb(); |
| 774 | #endif |
| 775 | } |
| 776 | |
| 777 | /* |
| 778 | * Side effect: |
| 779 | * |
| 780 | * 1) flush the block |
| 781 | * 2) Increment active_blk_num |
| 782 | * |
| 783 | * Note:We DONT refresh the timer on purpose. |
| 784 | * Because almost always the next block will be opened. |
| 785 | */ |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 786 | static void prb_close_block(struct tpacket_kbdq_core *pkc1, |
| 787 | struct tpacket_block_desc *pbd1, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 788 | struct packet_sock *po, unsigned int stat) |
| 789 | { |
| 790 | __u32 status = TP_STATUS_USER | stat; |
| 791 | |
| 792 | struct tpacket3_hdr *last_pkt; |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 793 | struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1; |
Dan Collins | da413ee | 2014-12-19 16:49:25 +1300 | [diff] [blame] | 794 | struct sock *sk = &po->sk; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 795 | |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 796 | if (po->stats.stats3.tp_drops) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 797 | status |= TP_STATUS_LOSING; |
| 798 | |
| 799 | last_pkt = (struct tpacket3_hdr *)pkc1->prev; |
| 800 | last_pkt->tp_next_offset = 0; |
| 801 | |
| 802 | /* Get the ts of the last pkt */ |
| 803 | if (BLOCK_NUM_PKTS(pbd1)) { |
| 804 | h1->ts_last_pkt.ts_sec = last_pkt->tp_sec; |
| 805 | h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec; |
| 806 | } else { |
Alexander Drozdov | 41a50d6 | 2015-02-24 08:18:28 +0300 | [diff] [blame] | 807 | /* Ok, we tmo'd - so get the current time. |
| 808 | * |
| 809 | * It shouldn't really happen as we don't close empty |
| 810 | * blocks. See prb_retire_rx_blk_timer_expired(). |
| 811 | */ |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 812 | struct timespec ts; |
| 813 | getnstimeofday(&ts); |
| 814 | h1->ts_last_pkt.ts_sec = ts.tv_sec; |
| 815 | h1->ts_last_pkt.ts_nsec = ts.tv_nsec; |
| 816 | } |
| 817 | |
| 818 | smp_wmb(); |
| 819 | |
| 820 | /* Flush the block */ |
| 821 | prb_flush_block(pkc1, pbd1, status); |
| 822 | |
Dan Collins | da413ee | 2014-12-19 16:49:25 +1300 | [diff] [blame] | 823 | sk->sk_data_ready(sk); |
| 824 | |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 825 | pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1); |
| 826 | } |
| 827 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 828 | static void prb_thaw_queue(struct tpacket_kbdq_core *pkc) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 829 | { |
| 830 | pkc->reset_pending_on_curr_blk = 0; |
| 831 | } |
| 832 | |
| 833 | /* |
| 834 | * Side effect of opening a block: |
| 835 | * |
| 836 | * 1) prb_queue is thawed. |
| 837 | * 2) retire_blk_timer is refreshed. |
| 838 | * |
| 839 | */ |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 840 | static void prb_open_block(struct tpacket_kbdq_core *pkc1, |
| 841 | struct tpacket_block_desc *pbd1) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 842 | { |
| 843 | struct timespec ts; |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 844 | struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 845 | |
| 846 | smp_rmb(); |
| 847 | |
Daniel Borkmann | 8da3056 | 2013-05-03 02:57:00 +0000 | [diff] [blame] | 848 | /* We could have just memset this but we will lose the |
| 849 | * flexibility of making the priv area sticky |
| 850 | */ |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 851 | |
Daniel Borkmann | 8da3056 | 2013-05-03 02:57:00 +0000 | [diff] [blame] | 852 | BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++; |
| 853 | BLOCK_NUM_PKTS(pbd1) = 0; |
| 854 | BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 855 | |
Daniel Borkmann | 8da3056 | 2013-05-03 02:57:00 +0000 | [diff] [blame] | 856 | getnstimeofday(&ts); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 857 | |
Daniel Borkmann | 8da3056 | 2013-05-03 02:57:00 +0000 | [diff] [blame] | 858 | h1->ts_first_pkt.ts_sec = ts.tv_sec; |
| 859 | h1->ts_first_pkt.ts_nsec = ts.tv_nsec; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 860 | |
Daniel Borkmann | 8da3056 | 2013-05-03 02:57:00 +0000 | [diff] [blame] | 861 | pkc1->pkblk_start = (char *)pbd1; |
| 862 | pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); |
| 863 | |
| 864 | BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); |
| 865 | BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN; |
| 866 | |
| 867 | pbd1->version = pkc1->version; |
| 868 | pkc1->prev = pkc1->nxt_offset; |
| 869 | pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size; |
| 870 | |
| 871 | prb_thaw_queue(pkc1); |
| 872 | _prb_refresh_rx_retire_blk_timer(pkc1); |
| 873 | |
| 874 | smp_wmb(); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 875 | } |
| 876 | |
| 877 | /* |
| 878 | * Queue freeze logic: |
| 879 | * 1) Assume tp_block_nr = 8 blocks. |
| 880 | * 2) At time 't0', user opens Rx ring. |
| 881 | * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7 |
| 882 | * 4) user-space is either sleeping or processing block '0'. |
| 883 | * 5) tpacket_rcv is currently filling block '7', since there is no space left, |
| 884 | * it will close block-7,loop around and try to fill block '0'. |
| 885 | * call-flow: |
| 886 | * __packet_lookup_frame_in_block |
| 887 | * prb_retire_current_block() |
| 888 | * prb_dispatch_next_block() |
| 889 | * |->(BLOCK_STATUS == USER) evaluates to true |
| 890 | * 5.1) Since block-0 is currently in-use, we just freeze the queue. |
| 891 | * 6) Now there are two cases: |
| 892 | * 6.1) Link goes idle right after the queue is frozen. |
| 893 | * But remember, the last open_block() refreshed the timer. |
| 894 | * When this timer expires,it will refresh itself so that we can |
| 895 | * re-open block-0 in near future. |
| 896 | * 6.2) Link is busy and keeps on receiving packets. This is a simple |
| 897 | * case and __packet_lookup_frame_in_block will check if block-0 |
| 898 | * is free and can now be re-used. |
| 899 | */ |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 900 | static void prb_freeze_queue(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 901 | struct packet_sock *po) |
| 902 | { |
| 903 | pkc->reset_pending_on_curr_blk = 1; |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 904 | po->stats.stats3.tp_freeze_q_cnt++; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 905 | } |
| 906 | |
| 907 | #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT)) |
| 908 | |
| 909 | /* |
| 910 | * If the next block is free then we will dispatch it |
| 911 | * and return a good offset. |
| 912 | * Else, we will freeze the queue. |
| 913 | * So, caller must check the return value. |
| 914 | */ |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 915 | static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 916 | struct packet_sock *po) |
| 917 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 918 | struct tpacket_block_desc *pbd; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 919 | |
| 920 | smp_rmb(); |
| 921 | |
| 922 | /* 1. Get current block num */ |
| 923 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
| 924 | |
| 925 | /* 2. If this block is currently in_use then freeze the queue */ |
| 926 | if (TP_STATUS_USER & BLOCK_STATUS(pbd)) { |
| 927 | prb_freeze_queue(pkc, po); |
| 928 | return NULL; |
| 929 | } |
| 930 | |
| 931 | /* |
| 932 | * 3. |
| 933 | * open this block and return the offset where the first packet |
| 934 | * needs to get stored. |
| 935 | */ |
| 936 | prb_open_block(pkc, pbd); |
| 937 | return (void *)pkc->nxt_offset; |
| 938 | } |
| 939 | |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 940 | static void prb_retire_current_block(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 941 | struct packet_sock *po, unsigned int status) |
| 942 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 943 | struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 944 | |
| 945 | /* retire/close the current block */ |
| 946 | if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) { |
| 947 | /* |
| 948 | * Plug the case where copy_bits() is in progress on |
| 949 | * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't |
| 950 | * have space to copy the pkt in the current block and |
| 951 | * called prb_retire_current_block() |
| 952 | * |
| 953 | * We don't need to worry about the TMO case because |
| 954 | * the timer-handler already handled this case. |
| 955 | */ |
| 956 | if (!(status & TP_STATUS_BLK_TMO)) { |
| 957 | while (atomic_read(&pkc->blk_fill_in_prog)) { |
| 958 | /* Waiting for skb_copy_bits to finish... */ |
| 959 | cpu_relax(); |
| 960 | } |
| 961 | } |
| 962 | prb_close_block(pkc, pbd, po, status); |
| 963 | return; |
| 964 | } |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 965 | } |
| 966 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 967 | static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc, |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 968 | struct tpacket_block_desc *pbd) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 969 | { |
| 970 | return TP_STATUS_USER & BLOCK_STATUS(pbd); |
| 971 | } |
| 972 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 973 | static int prb_queue_frozen(struct tpacket_kbdq_core *pkc) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 974 | { |
| 975 | return pkc->reset_pending_on_curr_blk; |
| 976 | } |
| 977 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 978 | static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 979 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 980 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 981 | atomic_dec(&pkc->blk_fill_in_prog); |
| 982 | } |
| 983 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 984 | static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 985 | struct tpacket3_hdr *ppd) |
| 986 | { |
Tom Herbert | 3958afa1b | 2013-12-15 22:12:06 -0800 | [diff] [blame] | 987 | ppd->hv1.tp_rxhash = skb_get_hash(pkc->skb); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 988 | } |
| 989 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 990 | static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 991 | struct tpacket3_hdr *ppd) |
| 992 | { |
| 993 | ppd->hv1.tp_rxhash = 0; |
| 994 | } |
| 995 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 996 | static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 997 | struct tpacket3_hdr *ppd) |
| 998 | { |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 999 | if (skb_vlan_tag_present(pkc->skb)) { |
| 1000 | ppd->hv1.tp_vlan_tci = skb_vlan_tag_get(pkc->skb); |
Atzm Watanabe | a0cdfcf | 2013-12-17 22:53:40 +0900 | [diff] [blame] | 1001 | ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->vlan_proto); |
| 1002 | ppd->tp_status = TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1003 | } else { |
danborkmann@iogearbox.net | 9e67030 | 2012-08-20 03:34:03 +0000 | [diff] [blame] | 1004 | ppd->hv1.tp_vlan_tci = 0; |
Atzm Watanabe | a0cdfcf | 2013-12-17 22:53:40 +0900 | [diff] [blame] | 1005 | ppd->hv1.tp_vlan_tpid = 0; |
danborkmann@iogearbox.net | 9e67030 | 2012-08-20 03:34:03 +0000 | [diff] [blame] | 1006 | ppd->tp_status = TP_STATUS_AVAILABLE; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1007 | } |
| 1008 | } |
| 1009 | |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 1010 | static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1011 | struct tpacket3_hdr *ppd) |
| 1012 | { |
Atzm Watanabe | a0cdfcf | 2013-12-17 22:53:40 +0900 | [diff] [blame] | 1013 | ppd->hv1.tp_padding = 0; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1014 | prb_fill_vlan_info(pkc, ppd); |
| 1015 | |
| 1016 | if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH) |
| 1017 | prb_fill_rxhash(pkc, ppd); |
| 1018 | else |
| 1019 | prb_clear_rxhash(pkc, ppd); |
| 1020 | } |
| 1021 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1022 | static void prb_fill_curr_block(char *curr, |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 1023 | struct tpacket_kbdq_core *pkc, |
| 1024 | struct tpacket_block_desc *pbd, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1025 | unsigned int len) |
| 1026 | { |
| 1027 | struct tpacket3_hdr *ppd; |
| 1028 | |
| 1029 | ppd = (struct tpacket3_hdr *)curr; |
| 1030 | ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len); |
| 1031 | pkc->prev = curr; |
| 1032 | pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len); |
| 1033 | BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len); |
| 1034 | BLOCK_NUM_PKTS(pbd) += 1; |
| 1035 | atomic_inc(&pkc->blk_fill_in_prog); |
| 1036 | prb_run_all_ft_ops(pkc, ppd); |
| 1037 | } |
| 1038 | |
| 1039 | /* Assumes caller has the sk->rx_queue.lock */ |
| 1040 | static void *__packet_lookup_frame_in_block(struct packet_sock *po, |
| 1041 | struct sk_buff *skb, |
| 1042 | int status, |
| 1043 | unsigned int len |
| 1044 | ) |
| 1045 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 1046 | struct tpacket_kbdq_core *pkc; |
| 1047 | struct tpacket_block_desc *pbd; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1048 | char *curr, *end; |
| 1049 | |
Joe Perches | e319269 | 2012-06-03 17:41:40 +0000 | [diff] [blame] | 1050 | pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1051 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
| 1052 | |
| 1053 | /* Queue is frozen when user space is lagging behind */ |
| 1054 | if (prb_queue_frozen(pkc)) { |
| 1055 | /* |
| 1056 | * Check if that last block which caused the queue to freeze, |
| 1057 | * is still in_use by user-space. |
| 1058 | */ |
| 1059 | if (prb_curr_blk_in_use(pkc, pbd)) { |
| 1060 | /* Can't record this packet */ |
| 1061 | return NULL; |
| 1062 | } else { |
| 1063 | /* |
| 1064 | * Ok, the block was released by user-space. |
| 1065 | * Now let's open that block. |
| 1066 | * opening a block also thaws the queue. |
| 1067 | * Thawing is a side effect. |
| 1068 | */ |
| 1069 | prb_open_block(pkc, pbd); |
| 1070 | } |
| 1071 | } |
| 1072 | |
| 1073 | smp_mb(); |
| 1074 | curr = pkc->nxt_offset; |
| 1075 | pkc->skb = skb; |
Joe Perches | e319269 | 2012-06-03 17:41:40 +0000 | [diff] [blame] | 1076 | end = (char *)pbd + pkc->kblk_size; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1077 | |
| 1078 | /* first try the current block */ |
| 1079 | if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) { |
| 1080 | prb_fill_curr_block(curr, pkc, pbd, len); |
| 1081 | return (void *)curr; |
| 1082 | } |
| 1083 | |
| 1084 | /* Ok, close the current block */ |
| 1085 | prb_retire_current_block(pkc, po, 0); |
| 1086 | |
| 1087 | /* Now, try to dispatch the next block */ |
| 1088 | curr = (char *)prb_dispatch_next_block(pkc, po); |
| 1089 | if (curr) { |
| 1090 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
| 1091 | prb_fill_curr_block(curr, pkc, pbd, len); |
| 1092 | return (void *)curr; |
| 1093 | } |
| 1094 | |
| 1095 | /* |
| 1096 | * No free blocks are available.user_space hasn't caught up yet. |
| 1097 | * Queue was just frozen and now this packet will get dropped. |
| 1098 | */ |
| 1099 | return NULL; |
| 1100 | } |
| 1101 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1102 | static void *packet_current_rx_frame(struct packet_sock *po, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1103 | struct sk_buff *skb, |
| 1104 | int status, unsigned int len) |
| 1105 | { |
| 1106 | char *curr = NULL; |
| 1107 | switch (po->tp_version) { |
| 1108 | case TPACKET_V1: |
| 1109 | case TPACKET_V2: |
| 1110 | curr = packet_lookup_frame(po, &po->rx_ring, |
| 1111 | po->rx_ring.head, status); |
| 1112 | return curr; |
| 1113 | case TPACKET_V3: |
| 1114 | return __packet_lookup_frame_in_block(po, skb, status, len); |
| 1115 | default: |
| 1116 | WARN(1, "TPACKET version not supported\n"); |
| 1117 | BUG(); |
Ying Xue | 99aa347 | 2012-08-06 16:27:10 +0000 | [diff] [blame] | 1118 | return NULL; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1119 | } |
| 1120 | } |
| 1121 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1122 | static void *prb_lookup_block(struct packet_sock *po, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1123 | struct packet_ring_buffer *rb, |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1124 | unsigned int idx, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1125 | int status) |
| 1126 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 1127 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb); |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1128 | struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1129 | |
| 1130 | if (status != BLOCK_STATUS(pbd)) |
| 1131 | return NULL; |
| 1132 | return pbd; |
| 1133 | } |
| 1134 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1135 | static int prb_previous_blk_num(struct packet_ring_buffer *rb) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1136 | { |
| 1137 | unsigned int prev; |
| 1138 | if (rb->prb_bdqc.kactive_blk_num) |
| 1139 | prev = rb->prb_bdqc.kactive_blk_num-1; |
| 1140 | else |
| 1141 | prev = rb->prb_bdqc.knum_blocks-1; |
| 1142 | return prev; |
| 1143 | } |
| 1144 | |
| 1145 | /* Assumes caller has held the rx_queue.lock */ |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1146 | static void *__prb_previous_block(struct packet_sock *po, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1147 | struct packet_ring_buffer *rb, |
| 1148 | int status) |
| 1149 | { |
| 1150 | unsigned int previous = prb_previous_blk_num(rb); |
| 1151 | return prb_lookup_block(po, rb, previous, status); |
| 1152 | } |
| 1153 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1154 | static void *packet_previous_rx_frame(struct packet_sock *po, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1155 | struct packet_ring_buffer *rb, |
| 1156 | int status) |
| 1157 | { |
| 1158 | if (po->tp_version <= TPACKET_V2) |
| 1159 | return packet_previous_frame(po, rb, status); |
| 1160 | |
| 1161 | return __prb_previous_block(po, rb, status); |
| 1162 | } |
| 1163 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1164 | static void packet_increment_rx_head(struct packet_sock *po, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1165 | struct packet_ring_buffer *rb) |
| 1166 | { |
| 1167 | switch (po->tp_version) { |
| 1168 | case TPACKET_V1: |
| 1169 | case TPACKET_V2: |
| 1170 | return packet_increment_head(rb); |
| 1171 | case TPACKET_V3: |
| 1172 | default: |
| 1173 | WARN(1, "TPACKET version not supported.\n"); |
| 1174 | BUG(); |
| 1175 | return; |
| 1176 | } |
| 1177 | } |
| 1178 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1179 | static void *packet_previous_frame(struct packet_sock *po, |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1180 | struct packet_ring_buffer *rb, |
| 1181 | int status) |
| 1182 | { |
| 1183 | unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; |
| 1184 | return packet_lookup_frame(po, rb, previous, status); |
| 1185 | } |
| 1186 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1187 | static void packet_increment_head(struct packet_ring_buffer *buff) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1188 | { |
| 1189 | buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; |
| 1190 | } |
| 1191 | |
Daniel Borkmann | b013840 | 2014-01-15 16:25:36 +0100 | [diff] [blame] | 1192 | static void packet_inc_pending(struct packet_ring_buffer *rb) |
| 1193 | { |
| 1194 | this_cpu_inc(*rb->pending_refcnt); |
| 1195 | } |
| 1196 | |
| 1197 | static void packet_dec_pending(struct packet_ring_buffer *rb) |
| 1198 | { |
| 1199 | this_cpu_dec(*rb->pending_refcnt); |
| 1200 | } |
| 1201 | |
| 1202 | static unsigned int packet_read_pending(const struct packet_ring_buffer *rb) |
| 1203 | { |
| 1204 | unsigned int refcnt = 0; |
| 1205 | int cpu; |
| 1206 | |
| 1207 | /* We don't use pending refcount in rx_ring. */ |
| 1208 | if (rb->pending_refcnt == NULL) |
| 1209 | return 0; |
| 1210 | |
| 1211 | for_each_possible_cpu(cpu) |
| 1212 | refcnt += *per_cpu_ptr(rb->pending_refcnt, cpu); |
| 1213 | |
| 1214 | return refcnt; |
| 1215 | } |
| 1216 | |
| 1217 | static int packet_alloc_pending(struct packet_sock *po) |
| 1218 | { |
| 1219 | po->rx_ring.pending_refcnt = NULL; |
| 1220 | |
| 1221 | po->tx_ring.pending_refcnt = alloc_percpu(unsigned int); |
| 1222 | if (unlikely(po->tx_ring.pending_refcnt == NULL)) |
| 1223 | return -ENOBUFS; |
| 1224 | |
| 1225 | return 0; |
| 1226 | } |
| 1227 | |
| 1228 | static void packet_free_pending(struct packet_sock *po) |
| 1229 | { |
| 1230 | free_percpu(po->tx_ring.pending_refcnt); |
| 1231 | } |
| 1232 | |
Willem de Bruijn | 9954729 | 2015-05-12 11:56:47 -0400 | [diff] [blame] | 1233 | #define ROOM_POW_OFF 2 |
| 1234 | #define ROOM_NONE 0x0 |
| 1235 | #define ROOM_LOW 0x1 |
| 1236 | #define ROOM_NORMAL 0x2 |
| 1237 | |
| 1238 | static bool __tpacket_has_room(struct packet_sock *po, int pow_off) |
| 1239 | { |
| 1240 | int idx, len; |
| 1241 | |
| 1242 | len = po->rx_ring.frame_max + 1; |
| 1243 | idx = po->rx_ring.head; |
| 1244 | if (pow_off) |
| 1245 | idx += len >> pow_off; |
| 1246 | if (idx >= len) |
| 1247 | idx -= len; |
| 1248 | return packet_lookup_frame(po, &po->rx_ring, idx, TP_STATUS_KERNEL); |
| 1249 | } |
| 1250 | |
| 1251 | static bool __tpacket_v3_has_room(struct packet_sock *po, int pow_off) |
| 1252 | { |
| 1253 | int idx, len; |
| 1254 | |
| 1255 | len = po->rx_ring.prb_bdqc.knum_blocks; |
| 1256 | idx = po->rx_ring.prb_bdqc.kactive_blk_num; |
| 1257 | if (pow_off) |
| 1258 | idx += len >> pow_off; |
| 1259 | if (idx >= len) |
| 1260 | idx -= len; |
| 1261 | return prb_lookup_block(po, &po->rx_ring, idx, TP_STATUS_KERNEL); |
| 1262 | } |
| 1263 | |
Willem de Bruijn | 2ccdbaa | 2015-05-12 11:56:48 -0400 | [diff] [blame] | 1264 | static int __packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb) |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1265 | { |
| 1266 | struct sock *sk = &po->sk; |
Willem de Bruijn | 9954729 | 2015-05-12 11:56:47 -0400 | [diff] [blame] | 1267 | int ret = ROOM_NONE; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1268 | |
Willem de Bruijn | 9954729 | 2015-05-12 11:56:47 -0400 | [diff] [blame] | 1269 | if (po->prot_hook.func != tpacket_rcv) { |
| 1270 | int avail = sk->sk_rcvbuf - atomic_read(&sk->sk_rmem_alloc) |
Willem de Bruijn | 2ccdbaa | 2015-05-12 11:56:48 -0400 | [diff] [blame] | 1271 | - (skb ? skb->truesize : 0); |
Willem de Bruijn | 9954729 | 2015-05-12 11:56:47 -0400 | [diff] [blame] | 1272 | if (avail > (sk->sk_rcvbuf >> ROOM_POW_OFF)) |
| 1273 | return ROOM_NORMAL; |
| 1274 | else if (avail > 0) |
| 1275 | return ROOM_LOW; |
| 1276 | else |
| 1277 | return ROOM_NONE; |
| 1278 | } |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1279 | |
Willem de Bruijn | 9954729 | 2015-05-12 11:56:47 -0400 | [diff] [blame] | 1280 | if (po->tp_version == TPACKET_V3) { |
| 1281 | if (__tpacket_v3_has_room(po, ROOM_POW_OFF)) |
| 1282 | ret = ROOM_NORMAL; |
| 1283 | else if (__tpacket_v3_has_room(po, 0)) |
| 1284 | ret = ROOM_LOW; |
| 1285 | } else { |
| 1286 | if (__tpacket_has_room(po, ROOM_POW_OFF)) |
| 1287 | ret = ROOM_NORMAL; |
| 1288 | else if (__tpacket_has_room(po, 0)) |
| 1289 | ret = ROOM_LOW; |
| 1290 | } |
Willem de Bruijn | 2ccdbaa | 2015-05-12 11:56:48 -0400 | [diff] [blame] | 1291 | |
| 1292 | return ret; |
| 1293 | } |
| 1294 | |
| 1295 | static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb) |
| 1296 | { |
| 1297 | int ret; |
| 1298 | bool has_room; |
| 1299 | |
Willem de Bruijn | 54d7c01 | 2015-05-14 15:25:02 -0400 | [diff] [blame] | 1300 | spin_lock_bh(&po->sk.sk_receive_queue.lock); |
| 1301 | ret = __packet_rcv_has_room(po, skb); |
Willem de Bruijn | 2ccdbaa | 2015-05-12 11:56:48 -0400 | [diff] [blame] | 1302 | has_room = ret == ROOM_NORMAL; |
| 1303 | if (po->pressure == has_room) |
Willem de Bruijn | 54d7c01 | 2015-05-14 15:25:02 -0400 | [diff] [blame] | 1304 | po->pressure = !has_room; |
| 1305 | spin_unlock_bh(&po->sk.sk_receive_queue.lock); |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1306 | |
Willem de Bruijn | 9954729 | 2015-05-12 11:56:47 -0400 | [diff] [blame] | 1307 | return ret; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1308 | } |
| 1309 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | static void packet_sock_destruct(struct sock *sk) |
| 1311 | { |
Richard Cochran | ed85b56 | 2010-04-07 22:41:28 +0000 | [diff] [blame] | 1312 | skb_queue_purge(&sk->sk_error_queue); |
| 1313 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1314 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
| 1315 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1316 | |
| 1317 | if (!sock_flag(sk, SOCK_DEAD)) { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1318 | pr_err("Attempt to release alive packet socket: %p\n", sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | return; |
| 1320 | } |
| 1321 | |
Pavel Emelyanov | 17ab56a | 2007-11-10 21:38:48 -0800 | [diff] [blame] | 1322 | sk_refcnt_debug_dec(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | } |
| 1324 | |
Willem de Bruijn | 3b3a5b0 | 2015-05-12 11:56:49 -0400 | [diff] [blame] | 1325 | static bool fanout_flow_is_huge(struct packet_sock *po, struct sk_buff *skb) |
| 1326 | { |
| 1327 | u32 rxhash; |
| 1328 | int i, count = 0; |
| 1329 | |
| 1330 | rxhash = skb_get_hash(skb); |
| 1331 | for (i = 0; i < ROLLOVER_HLEN; i++) |
| 1332 | if (po->rollover->history[i] == rxhash) |
| 1333 | count++; |
| 1334 | |
| 1335 | po->rollover->history[prandom_u32() % ROLLOVER_HLEN] = rxhash; |
| 1336 | return count > (ROLLOVER_HLEN >> 1); |
| 1337 | } |
| 1338 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1339 | static unsigned int fanout_demux_hash(struct packet_fanout *f, |
| 1340 | struct sk_buff *skb, |
| 1341 | unsigned int num) |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1342 | { |
David S. Miller | eb70db8 | 2016-07-01 16:07:50 -0400 | [diff] [blame] | 1343 | return reciprocal_scale(__skb_get_hash_symmetric(skb), num); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1344 | } |
| 1345 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1346 | static unsigned int fanout_demux_lb(struct packet_fanout *f, |
| 1347 | struct sk_buff *skb, |
| 1348 | unsigned int num) |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1349 | { |
Willem de Bruijn | 468479e | 2015-06-17 15:59:34 -0400 | [diff] [blame] | 1350 | unsigned int val = atomic_inc_return(&f->rr_cur); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1351 | |
Willem de Bruijn | 468479e | 2015-06-17 15:59:34 -0400 | [diff] [blame] | 1352 | return val % num; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1353 | } |
| 1354 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1355 | static unsigned int fanout_demux_cpu(struct packet_fanout *f, |
| 1356 | struct sk_buff *skb, |
| 1357 | unsigned int num) |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1358 | { |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1359 | return smp_processor_id() % num; |
| 1360 | } |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1361 | |
Daniel Borkmann | 5df0ddf | 2013-08-28 22:13:09 +0200 | [diff] [blame] | 1362 | static unsigned int fanout_demux_rnd(struct packet_fanout *f, |
| 1363 | struct sk_buff *skb, |
| 1364 | unsigned int num) |
| 1365 | { |
Daniel Borkmann | f337db6 | 2014-01-22 02:29:39 +0100 | [diff] [blame] | 1366 | return prandom_u32_max(num); |
Daniel Borkmann | 5df0ddf | 2013-08-28 22:13:09 +0200 | [diff] [blame] | 1367 | } |
| 1368 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1369 | static unsigned int fanout_demux_rollover(struct packet_fanout *f, |
| 1370 | struct sk_buff *skb, |
Willem de Bruijn | ad377ca | 2015-05-12 11:56:45 -0400 | [diff] [blame] | 1371 | unsigned int idx, bool try_self, |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1372 | unsigned int num) |
| 1373 | { |
Willem de Bruijn | 4633c9e | 2015-05-17 19:44:02 -0400 | [diff] [blame] | 1374 | struct packet_sock *po, *po_next, *po_skip = NULL; |
Willem de Bruijn | a9b6391 | 2015-05-12 11:56:50 -0400 | [diff] [blame] | 1375 | unsigned int i, j, room = ROOM_NONE; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1376 | |
Willem de Bruijn | 0648ab7 | 2015-05-12 11:56:46 -0400 | [diff] [blame] | 1377 | po = pkt_sk(f->arr[idx]); |
Willem de Bruijn | 3b3a5b0 | 2015-05-12 11:56:49 -0400 | [diff] [blame] | 1378 | |
| 1379 | if (try_self) { |
| 1380 | room = packet_rcv_has_room(po, skb); |
| 1381 | if (room == ROOM_NORMAL || |
| 1382 | (room == ROOM_LOW && !fanout_flow_is_huge(po, skb))) |
| 1383 | return idx; |
Willem de Bruijn | 4633c9e | 2015-05-17 19:44:02 -0400 | [diff] [blame] | 1384 | po_skip = po; |
Willem de Bruijn | 3b3a5b0 | 2015-05-12 11:56:49 -0400 | [diff] [blame] | 1385 | } |
Willem de Bruijn | ad377ca | 2015-05-12 11:56:45 -0400 | [diff] [blame] | 1386 | |
Willem de Bruijn | 0648ab7 | 2015-05-12 11:56:46 -0400 | [diff] [blame] | 1387 | i = j = min_t(int, po->rollover->sock, num - 1); |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1388 | do { |
Willem de Bruijn | 2ccdbaa | 2015-05-12 11:56:48 -0400 | [diff] [blame] | 1389 | po_next = pkt_sk(f->arr[i]); |
Willem de Bruijn | 4633c9e | 2015-05-17 19:44:02 -0400 | [diff] [blame] | 1390 | if (po_next != po_skip && !po_next->pressure && |
Willem de Bruijn | 2ccdbaa | 2015-05-12 11:56:48 -0400 | [diff] [blame] | 1391 | packet_rcv_has_room(po_next, skb) == ROOM_NORMAL) { |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1392 | if (i != j) |
Willem de Bruijn | 0648ab7 | 2015-05-12 11:56:46 -0400 | [diff] [blame] | 1393 | po->rollover->sock = i; |
Willem de Bruijn | a9b6391 | 2015-05-12 11:56:50 -0400 | [diff] [blame] | 1394 | atomic_long_inc(&po->rollover->num); |
| 1395 | if (room == ROOM_LOW) |
| 1396 | atomic_long_inc(&po->rollover->num_huge); |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1397 | return i; |
| 1398 | } |
Willem de Bruijn | ad377ca | 2015-05-12 11:56:45 -0400 | [diff] [blame] | 1399 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1400 | if (++i == num) |
| 1401 | i = 0; |
| 1402 | } while (i != j); |
| 1403 | |
Willem de Bruijn | a9b6391 | 2015-05-12 11:56:50 -0400 | [diff] [blame] | 1404 | atomic_long_inc(&po->rollover->num_failed); |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1405 | return idx; |
| 1406 | } |
| 1407 | |
Neil Horman | 2d36097 | 2014-01-22 16:01:44 -0500 | [diff] [blame] | 1408 | static unsigned int fanout_demux_qm(struct packet_fanout *f, |
| 1409 | struct sk_buff *skb, |
| 1410 | unsigned int num) |
| 1411 | { |
| 1412 | return skb_get_queue_mapping(skb) % num; |
| 1413 | } |
| 1414 | |
Willem de Bruijn | 47dceb8 | 2015-08-14 22:31:34 -0400 | [diff] [blame] | 1415 | static unsigned int fanout_demux_bpf(struct packet_fanout *f, |
| 1416 | struct sk_buff *skb, |
| 1417 | unsigned int num) |
| 1418 | { |
| 1419 | struct bpf_prog *prog; |
| 1420 | unsigned int ret = 0; |
| 1421 | |
| 1422 | rcu_read_lock(); |
| 1423 | prog = rcu_dereference(f->bpf_prog); |
| 1424 | if (prog) |
Alexei Starovoitov | ff936a0 | 2015-10-07 10:55:41 -0700 | [diff] [blame] | 1425 | ret = bpf_prog_run_clear_cb(prog, skb) % num; |
Willem de Bruijn | 47dceb8 | 2015-08-14 22:31:34 -0400 | [diff] [blame] | 1426 | rcu_read_unlock(); |
| 1427 | |
| 1428 | return ret; |
| 1429 | } |
| 1430 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1431 | static bool fanout_has_flag(struct packet_fanout *f, u16 flag) |
| 1432 | { |
| 1433 | return f->flags & (flag >> 8); |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1434 | } |
| 1435 | |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1436 | static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev, |
| 1437 | struct packet_type *pt, struct net_device *orig_dev) |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1438 | { |
| 1439 | struct packet_fanout *f = pt->af_packet_priv; |
Eric Dumazet | f98f451 | 2015-06-16 07:59:11 -0700 | [diff] [blame] | 1440 | unsigned int num = READ_ONCE(f->num_members); |
Eric W. Biederman | 19bcf9f | 2015-10-09 13:44:54 -0500 | [diff] [blame] | 1441 | struct net *net = read_pnet(&f->net); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1442 | struct packet_sock *po; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1443 | unsigned int idx; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1444 | |
Eric W. Biederman | 19bcf9f | 2015-10-09 13:44:54 -0500 | [diff] [blame] | 1445 | if (!net_eq(dev_net(dev), net) || !num) { |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1446 | kfree_skb(skb); |
| 1447 | return 0; |
| 1448 | } |
| 1449 | |
Alexander Drozdov | 3f34b24 | 2015-02-20 08:24:27 +0300 | [diff] [blame] | 1450 | if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) { |
Eric W. Biederman | 19bcf9f | 2015-10-09 13:44:54 -0500 | [diff] [blame] | 1451 | skb = ip_check_defrag(net, skb, IP_DEFRAG_AF_PACKET); |
Alexander Drozdov | 3f34b24 | 2015-02-20 08:24:27 +0300 | [diff] [blame] | 1452 | if (!skb) |
| 1453 | return 0; |
| 1454 | } |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1455 | switch (f->type) { |
| 1456 | case PACKET_FANOUT_HASH: |
| 1457 | default: |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1458 | idx = fanout_demux_hash(f, skb, num); |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1459 | break; |
| 1460 | case PACKET_FANOUT_LB: |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1461 | idx = fanout_demux_lb(f, skb, num); |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1462 | break; |
| 1463 | case PACKET_FANOUT_CPU: |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1464 | idx = fanout_demux_cpu(f, skb, num); |
| 1465 | break; |
Daniel Borkmann | 5df0ddf | 2013-08-28 22:13:09 +0200 | [diff] [blame] | 1466 | case PACKET_FANOUT_RND: |
| 1467 | idx = fanout_demux_rnd(f, skb, num); |
| 1468 | break; |
Neil Horman | 2d36097 | 2014-01-22 16:01:44 -0500 | [diff] [blame] | 1469 | case PACKET_FANOUT_QM: |
| 1470 | idx = fanout_demux_qm(f, skb, num); |
| 1471 | break; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1472 | case PACKET_FANOUT_ROLLOVER: |
Willem de Bruijn | ad377ca | 2015-05-12 11:56:45 -0400 | [diff] [blame] | 1473 | idx = fanout_demux_rollover(f, skb, 0, false, num); |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1474 | break; |
Willem de Bruijn | 47dceb8 | 2015-08-14 22:31:34 -0400 | [diff] [blame] | 1475 | case PACKET_FANOUT_CBPF: |
Willem de Bruijn | f2e5209 | 2015-08-14 22:31:35 -0400 | [diff] [blame] | 1476 | case PACKET_FANOUT_EBPF: |
Willem de Bruijn | 47dceb8 | 2015-08-14 22:31:34 -0400 | [diff] [blame] | 1477 | idx = fanout_demux_bpf(f, skb, num); |
| 1478 | break; |
David S. Miller | 7736d33 | 2011-07-05 01:43:20 -0700 | [diff] [blame] | 1479 | } |
| 1480 | |
Willem de Bruijn | ad377ca | 2015-05-12 11:56:45 -0400 | [diff] [blame] | 1481 | if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER)) |
| 1482 | idx = fanout_demux_rollover(f, skb, idx, true, num); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1483 | |
Willem de Bruijn | ad377ca | 2015-05-12 11:56:45 -0400 | [diff] [blame] | 1484 | po = pkt_sk(f->arr[idx]); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1485 | return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev); |
| 1486 | } |
| 1487 | |
Pavel Emelyanov | fff3321 | 2012-08-16 05:36:48 +0000 | [diff] [blame] | 1488 | DEFINE_MUTEX(fanout_mutex); |
| 1489 | EXPORT_SYMBOL_GPL(fanout_mutex); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1490 | static LIST_HEAD(fanout_list); |
| 1491 | |
| 1492 | static void __fanout_link(struct sock *sk, struct packet_sock *po) |
| 1493 | { |
| 1494 | struct packet_fanout *f = po->fanout; |
| 1495 | |
| 1496 | spin_lock(&f->lock); |
| 1497 | f->arr[f->num_members] = sk; |
| 1498 | smp_wmb(); |
| 1499 | f->num_members++; |
Anoob Soman | 9206efc | 2017-02-15 20:25:39 +0000 | [diff] [blame] | 1500 | if (f->num_members == 1) |
| 1501 | dev_add_pack(&f->prot_hook); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1502 | spin_unlock(&f->lock); |
| 1503 | } |
| 1504 | |
| 1505 | static void __fanout_unlink(struct sock *sk, struct packet_sock *po) |
| 1506 | { |
| 1507 | struct packet_fanout *f = po->fanout; |
| 1508 | int i; |
| 1509 | |
| 1510 | spin_lock(&f->lock); |
| 1511 | for (i = 0; i < f->num_members; i++) { |
| 1512 | if (f->arr[i] == sk) |
| 1513 | break; |
| 1514 | } |
| 1515 | BUG_ON(i >= f->num_members); |
| 1516 | f->arr[i] = f->arr[f->num_members - 1]; |
| 1517 | f->num_members--; |
Anoob Soman | 9206efc | 2017-02-15 20:25:39 +0000 | [diff] [blame] | 1518 | if (f->num_members == 0) |
| 1519 | __dev_remove_pack(&f->prot_hook); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1520 | spin_unlock(&f->lock); |
| 1521 | } |
| 1522 | |
Weilong Chen | d4dd8ae | 2013-12-23 11:31:38 +0800 | [diff] [blame] | 1523 | static bool match_fanout_group(struct packet_type *ptype, struct sock *sk) |
Eric Leblond | c0de08d | 2012-08-16 22:02:58 +0000 | [diff] [blame] | 1524 | { |
Eric Dumazet | 161642e | 2015-10-09 11:29:32 -0700 | [diff] [blame] | 1525 | if (sk->sk_family != PF_PACKET) |
| 1526 | return false; |
Eric Leblond | c0de08d | 2012-08-16 22:02:58 +0000 | [diff] [blame] | 1527 | |
Eric Dumazet | 161642e | 2015-10-09 11:29:32 -0700 | [diff] [blame] | 1528 | return ptype->af_packet_priv == pkt_sk(sk)->fanout; |
Eric Leblond | c0de08d | 2012-08-16 22:02:58 +0000 | [diff] [blame] | 1529 | } |
| 1530 | |
Willem de Bruijn | 47dceb8 | 2015-08-14 22:31:34 -0400 | [diff] [blame] | 1531 | static void fanout_init_data(struct packet_fanout *f) |
| 1532 | { |
| 1533 | switch (f->type) { |
| 1534 | case PACKET_FANOUT_LB: |
| 1535 | atomic_set(&f->rr_cur, 0); |
| 1536 | break; |
| 1537 | case PACKET_FANOUT_CBPF: |
Willem de Bruijn | f2e5209 | 2015-08-14 22:31:35 -0400 | [diff] [blame] | 1538 | case PACKET_FANOUT_EBPF: |
Willem de Bruijn | 47dceb8 | 2015-08-14 22:31:34 -0400 | [diff] [blame] | 1539 | RCU_INIT_POINTER(f->bpf_prog, NULL); |
| 1540 | break; |
| 1541 | } |
| 1542 | } |
| 1543 | |
| 1544 | static void __fanout_set_data_bpf(struct packet_fanout *f, struct bpf_prog *new) |
| 1545 | { |
| 1546 | struct bpf_prog *old; |
| 1547 | |
| 1548 | spin_lock(&f->lock); |
| 1549 | old = rcu_dereference_protected(f->bpf_prog, lockdep_is_held(&f->lock)); |
| 1550 | rcu_assign_pointer(f->bpf_prog, new); |
| 1551 | spin_unlock(&f->lock); |
| 1552 | |
| 1553 | if (old) { |
| 1554 | synchronize_net(); |
| 1555 | bpf_prog_destroy(old); |
| 1556 | } |
| 1557 | } |
| 1558 | |
| 1559 | static int fanout_set_data_cbpf(struct packet_sock *po, char __user *data, |
| 1560 | unsigned int len) |
| 1561 | { |
| 1562 | struct bpf_prog *new; |
| 1563 | struct sock_fprog fprog; |
| 1564 | int ret; |
| 1565 | |
| 1566 | if (sock_flag(&po->sk, SOCK_FILTER_LOCKED)) |
| 1567 | return -EPERM; |
| 1568 | if (len != sizeof(fprog)) |
| 1569 | return -EINVAL; |
| 1570 | if (copy_from_user(&fprog, data, len)) |
| 1571 | return -EFAULT; |
| 1572 | |
Daniel Borkmann | bab1899 | 2015-10-02 15:17:33 +0200 | [diff] [blame] | 1573 | ret = bpf_prog_create_from_user(&new, &fprog, NULL, false); |
Willem de Bruijn | 47dceb8 | 2015-08-14 22:31:34 -0400 | [diff] [blame] | 1574 | if (ret) |
| 1575 | return ret; |
| 1576 | |
| 1577 | __fanout_set_data_bpf(po->fanout, new); |
| 1578 | return 0; |
| 1579 | } |
| 1580 | |
Willem de Bruijn | f2e5209 | 2015-08-14 22:31:35 -0400 | [diff] [blame] | 1581 | static int fanout_set_data_ebpf(struct packet_sock *po, char __user *data, |
| 1582 | unsigned int len) |
| 1583 | { |
| 1584 | struct bpf_prog *new; |
| 1585 | u32 fd; |
| 1586 | |
| 1587 | if (sock_flag(&po->sk, SOCK_FILTER_LOCKED)) |
| 1588 | return -EPERM; |
| 1589 | if (len != sizeof(fd)) |
| 1590 | return -EINVAL; |
| 1591 | if (copy_from_user(&fd, data, len)) |
| 1592 | return -EFAULT; |
| 1593 | |
Daniel Borkmann | 113214b | 2016-06-30 17:24:44 +0200 | [diff] [blame] | 1594 | new = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER); |
Willem de Bruijn | f2e5209 | 2015-08-14 22:31:35 -0400 | [diff] [blame] | 1595 | if (IS_ERR(new)) |
| 1596 | return PTR_ERR(new); |
Willem de Bruijn | f2e5209 | 2015-08-14 22:31:35 -0400 | [diff] [blame] | 1597 | |
| 1598 | __fanout_set_data_bpf(po->fanout, new); |
| 1599 | return 0; |
| 1600 | } |
| 1601 | |
Willem de Bruijn | 47dceb8 | 2015-08-14 22:31:34 -0400 | [diff] [blame] | 1602 | static int fanout_set_data(struct packet_sock *po, char __user *data, |
| 1603 | unsigned int len) |
| 1604 | { |
| 1605 | switch (po->fanout->type) { |
| 1606 | case PACKET_FANOUT_CBPF: |
| 1607 | return fanout_set_data_cbpf(po, data, len); |
Willem de Bruijn | f2e5209 | 2015-08-14 22:31:35 -0400 | [diff] [blame] | 1608 | case PACKET_FANOUT_EBPF: |
| 1609 | return fanout_set_data_ebpf(po, data, len); |
Willem de Bruijn | 47dceb8 | 2015-08-14 22:31:34 -0400 | [diff] [blame] | 1610 | default: |
| 1611 | return -EINVAL; |
| 1612 | }; |
| 1613 | } |
| 1614 | |
| 1615 | static void fanout_release_data(struct packet_fanout *f) |
| 1616 | { |
| 1617 | switch (f->type) { |
| 1618 | case PACKET_FANOUT_CBPF: |
Willem de Bruijn | f2e5209 | 2015-08-14 22:31:35 -0400 | [diff] [blame] | 1619 | case PACKET_FANOUT_EBPF: |
Willem de Bruijn | 47dceb8 | 2015-08-14 22:31:34 -0400 | [diff] [blame] | 1620 | __fanout_set_data_bpf(f, NULL); |
| 1621 | }; |
| 1622 | } |
| 1623 | |
David S. Miller | 7736d33 | 2011-07-05 01:43:20 -0700 | [diff] [blame] | 1624 | static int fanout_add(struct sock *sk, u16 id, u16 type_flags) |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1625 | { |
Eric Dumazet | 722737f | 2017-02-14 09:03:51 -0800 | [diff] [blame] | 1626 | struct packet_rollover *rollover = NULL; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1627 | struct packet_sock *po = pkt_sk(sk); |
| 1628 | struct packet_fanout *f, *match; |
David S. Miller | 7736d33 | 2011-07-05 01:43:20 -0700 | [diff] [blame] | 1629 | u8 type = type_flags & 0xff; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1630 | u8 flags = type_flags >> 8; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1631 | int err; |
| 1632 | |
| 1633 | switch (type) { |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1634 | case PACKET_FANOUT_ROLLOVER: |
| 1635 | if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER) |
| 1636 | return -EINVAL; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1637 | case PACKET_FANOUT_HASH: |
| 1638 | case PACKET_FANOUT_LB: |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1639 | case PACKET_FANOUT_CPU: |
Daniel Borkmann | 5df0ddf | 2013-08-28 22:13:09 +0200 | [diff] [blame] | 1640 | case PACKET_FANOUT_RND: |
Neil Horman | 2d36097 | 2014-01-22 16:01:44 -0500 | [diff] [blame] | 1641 | case PACKET_FANOUT_QM: |
Willem de Bruijn | 47dceb8 | 2015-08-14 22:31:34 -0400 | [diff] [blame] | 1642 | case PACKET_FANOUT_CBPF: |
Willem de Bruijn | f2e5209 | 2015-08-14 22:31:35 -0400 | [diff] [blame] | 1643 | case PACKET_FANOUT_EBPF: |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1644 | break; |
| 1645 | default: |
| 1646 | return -EINVAL; |
| 1647 | } |
| 1648 | |
Eric Dumazet | 722737f | 2017-02-14 09:03:51 -0800 | [diff] [blame] | 1649 | mutex_lock(&fanout_mutex); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1650 | |
Eric Dumazet | 722737f | 2017-02-14 09:03:51 -0800 | [diff] [blame] | 1651 | err = -EINVAL; |
| 1652 | if (!po->running) |
| 1653 | goto out; |
| 1654 | |
| 1655 | err = -EALREADY; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1656 | if (po->fanout) |
Eric Dumazet | 722737f | 2017-02-14 09:03:51 -0800 | [diff] [blame] | 1657 | goto out; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1658 | |
Willem de Bruijn | 4633c9e | 2015-05-17 19:44:02 -0400 | [diff] [blame] | 1659 | if (type == PACKET_FANOUT_ROLLOVER || |
| 1660 | (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) { |
Eric Dumazet | 722737f | 2017-02-14 09:03:51 -0800 | [diff] [blame] | 1661 | err = -ENOMEM; |
| 1662 | rollover = kzalloc(sizeof(*rollover), GFP_KERNEL); |
| 1663 | if (!rollover) |
| 1664 | goto out; |
| 1665 | atomic_long_set(&rollover->num, 0); |
| 1666 | atomic_long_set(&rollover->num_huge, 0); |
| 1667 | atomic_long_set(&rollover->num_failed, 0); |
| 1668 | po->rollover = rollover; |
Willem de Bruijn | 0648ab7 | 2015-05-12 11:56:46 -0400 | [diff] [blame] | 1669 | } |
| 1670 | |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1671 | match = NULL; |
| 1672 | list_for_each_entry(f, &fanout_list, list) { |
| 1673 | if (f->id == id && |
| 1674 | read_pnet(&f->net) == sock_net(sk)) { |
| 1675 | match = f; |
| 1676 | break; |
| 1677 | } |
| 1678 | } |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1679 | err = -EINVAL; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1680 | if (match && match->flags != flags) |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1681 | goto out; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1682 | if (!match) { |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1683 | err = -ENOMEM; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1684 | match = kzalloc(sizeof(*match), GFP_KERNEL); |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1685 | if (!match) |
| 1686 | goto out; |
| 1687 | write_pnet(&match->net, sock_net(sk)); |
| 1688 | match->id = id; |
| 1689 | match->type = type; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1690 | match->flags = flags; |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1691 | INIT_LIST_HEAD(&match->list); |
| 1692 | spin_lock_init(&match->lock); |
| 1693 | atomic_set(&match->sk_ref, 0); |
Willem de Bruijn | 47dceb8 | 2015-08-14 22:31:34 -0400 | [diff] [blame] | 1694 | fanout_init_data(match); |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1695 | match->prot_hook.type = po->prot_hook.type; |
| 1696 | match->prot_hook.dev = po->prot_hook.dev; |
| 1697 | match->prot_hook.func = packet_rcv_fanout; |
| 1698 | match->prot_hook.af_packet_priv = match; |
Eric Leblond | c0de08d | 2012-08-16 22:02:58 +0000 | [diff] [blame] | 1699 | match->prot_hook.id_match = match_fanout_group; |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1700 | list_add(&match->list, &fanout_list); |
| 1701 | } |
| 1702 | err = -EINVAL; |
| 1703 | if (match->type == type && |
| 1704 | match->prot_hook.type == po->prot_hook.type && |
| 1705 | match->prot_hook.dev == po->prot_hook.dev) { |
| 1706 | err = -ENOSPC; |
| 1707 | if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) { |
| 1708 | __dev_remove_pack(&po->prot_hook); |
| 1709 | po->fanout = match; |
| 1710 | atomic_inc(&match->sk_ref); |
| 1711 | __fanout_link(sk, po); |
| 1712 | err = 0; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1713 | } |
| 1714 | } |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1715 | out: |
Eric Dumazet | 722737f | 2017-02-14 09:03:51 -0800 | [diff] [blame] | 1716 | if (err && rollover) { |
| 1717 | kfree(rollover); |
Willem de Bruijn | 0648ab7 | 2015-05-12 11:56:46 -0400 | [diff] [blame] | 1718 | po->rollover = NULL; |
| 1719 | } |
Eric Dumazet | 722737f | 2017-02-14 09:03:51 -0800 | [diff] [blame] | 1720 | mutex_unlock(&fanout_mutex); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1721 | return err; |
| 1722 | } |
| 1723 | |
Anoob Soman | 9206efc | 2017-02-15 20:25:39 +0000 | [diff] [blame] | 1724 | /* If pkt_sk(sk)->fanout->sk_ref is zero, this function removes |
| 1725 | * pkt_sk(sk)->fanout from fanout_list and returns pkt_sk(sk)->fanout. |
| 1726 | * It is the responsibility of the caller to call fanout_release_data() and |
| 1727 | * free the returned packet_fanout (after synchronize_net()) |
| 1728 | */ |
| 1729 | static struct packet_fanout *fanout_release(struct sock *sk) |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1730 | { |
| 1731 | struct packet_sock *po = pkt_sk(sk); |
| 1732 | struct packet_fanout *f; |
| 1733 | |
Pavel Emelyanov | fff3321 | 2012-08-16 05:36:48 +0000 | [diff] [blame] | 1734 | mutex_lock(&fanout_mutex); |
Eric Dumazet | 722737f | 2017-02-14 09:03:51 -0800 | [diff] [blame] | 1735 | f = po->fanout; |
| 1736 | if (f) { |
| 1737 | po->fanout = NULL; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1738 | |
Anoob Soman | 9206efc | 2017-02-15 20:25:39 +0000 | [diff] [blame] | 1739 | if (atomic_dec_and_test(&f->sk_ref)) |
Eric Dumazet | 722737f | 2017-02-14 09:03:51 -0800 | [diff] [blame] | 1740 | list_del(&f->list); |
Anoob Soman | 9206efc | 2017-02-15 20:25:39 +0000 | [diff] [blame] | 1741 | else |
| 1742 | f = NULL; |
Eric Dumazet | 722737f | 2017-02-14 09:03:51 -0800 | [diff] [blame] | 1743 | |
| 1744 | if (po->rollover) |
| 1745 | kfree_rcu(po->rollover, rcu); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1746 | } |
| 1747 | mutex_unlock(&fanout_mutex); |
Anoob Soman | 9206efc | 2017-02-15 20:25:39 +0000 | [diff] [blame] | 1748 | |
| 1749 | return f; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1750 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1751 | |
Daniel Borkmann | 3c70c13 | 2015-11-11 23:25:42 +0100 | [diff] [blame] | 1752 | static bool packet_extra_vlan_len_allowed(const struct net_device *dev, |
| 1753 | struct sk_buff *skb) |
| 1754 | { |
| 1755 | /* Earlier code assumed this would be a VLAN pkt, double-check |
| 1756 | * this now that we have the actual packet in hand. We can only |
| 1757 | * do this check on Ethernet devices. |
| 1758 | */ |
| 1759 | if (unlikely(dev->type != ARPHRD_ETHER)) |
| 1760 | return false; |
| 1761 | |
| 1762 | skb_reset_mac_header(skb); |
| 1763 | return likely(eth_hdr(skb)->h_proto == htons(ETH_P_8021Q)); |
| 1764 | } |
| 1765 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 1766 | static const struct proto_ops packet_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1767 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 1768 | static const struct proto_ops packet_ops_spkt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1769 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1770 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
| 1771 | struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1772 | { |
| 1773 | struct sock *sk; |
| 1774 | struct sockaddr_pkt *spkt; |
| 1775 | |
| 1776 | /* |
| 1777 | * When we registered the protocol we saved the socket in the data |
| 1778 | * field for just this event. |
| 1779 | */ |
| 1780 | |
| 1781 | sk = pt->af_packet_priv; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1782 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1783 | /* |
| 1784 | * Yank back the headers [hope the device set this |
| 1785 | * right or kerboom...] |
| 1786 | * |
| 1787 | * Incoming packets have ll header pulled, |
| 1788 | * push it back. |
| 1789 | * |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1790 | * For outgoing ones skb->data == skb_mac_header(skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | * so that this procedure is noop. |
| 1792 | */ |
| 1793 | |
| 1794 | if (skb->pkt_type == PACKET_LOOPBACK) |
| 1795 | goto out; |
| 1796 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 1797 | if (!net_eq(dev_net(dev), sock_net(sk))) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 1798 | goto out; |
| 1799 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1800 | skb = skb_share_check(skb, GFP_ATOMIC); |
| 1801 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | goto oom; |
| 1803 | |
| 1804 | /* drop any routing info */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1805 | skb_dst_drop(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1806 | |
Phil Oester | 84531c2 | 2005-07-12 11:57:52 -0700 | [diff] [blame] | 1807 | /* drop conntrack reference */ |
| 1808 | nf_reset(skb); |
| 1809 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 1810 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1812 | skb_push(skb, skb->data - skb_mac_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1813 | |
| 1814 | /* |
| 1815 | * The SOCK_PACKET socket receives _all_ frames. |
| 1816 | */ |
| 1817 | |
| 1818 | spkt->spkt_family = dev->type; |
| 1819 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); |
| 1820 | spkt->spkt_protocol = skb->protocol; |
| 1821 | |
| 1822 | /* |
| 1823 | * Charge the memory to the socket. This is done specifically |
| 1824 | * to prevent sockets using all the memory up. |
| 1825 | */ |
| 1826 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1827 | if (sock_queue_rcv_skb(sk, skb) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1828 | return 0; |
| 1829 | |
| 1830 | out: |
| 1831 | kfree_skb(skb); |
| 1832 | oom: |
| 1833 | return 0; |
| 1834 | } |
| 1835 | |
| 1836 | |
| 1837 | /* |
| 1838 | * Output a raw packet to a device layer. This bypasses all the other |
| 1839 | * protocol layers and you must therefore supply it with a complete frame |
| 1840 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1841 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1842 | static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg, |
| 1843 | size_t len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1844 | { |
| 1845 | struct sock *sk = sock->sk; |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 1846 | DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name); |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1847 | struct sk_buff *skb = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1848 | struct net_device *dev; |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 1849 | struct sockcm_cookie sockc; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1850 | __be16 proto = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | int err; |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 1852 | int extra_len = 0; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1853 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1854 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1855 | * Get and verify the address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1856 | */ |
| 1857 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1858 | if (saddr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1859 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1860 | return -EINVAL; |
| 1861 | if (msg->msg_namelen == sizeof(struct sockaddr_pkt)) |
| 1862 | proto = saddr->spkt_protocol; |
| 1863 | } else |
| 1864 | return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1865 | |
| 1866 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1867 | * Find the device first to size check it |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1868 | */ |
| 1869 | |
danborkmann@iogearbox.net | de74e92 | 2012-06-10 08:59:28 +0000 | [diff] [blame] | 1870 | saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0; |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1871 | retry: |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 1872 | rcu_read_lock(); |
| 1873 | dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | err = -ENODEV; |
| 1875 | if (dev == NULL) |
| 1876 | goto out_unlock; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1877 | |
David S. Miller | d5e76b0 | 2007-01-25 19:30:36 -0800 | [diff] [blame] | 1878 | err = -ENETDOWN; |
| 1879 | if (!(dev->flags & IFF_UP)) |
| 1880 | goto out_unlock; |
| 1881 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1882 | /* |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1883 | * You may not queue a frame bigger than the mtu. This is the lowest level |
| 1884 | * raw protocol and you must do your own fragmentation at this level. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1886 | |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 1887 | if (unlikely(sock_flag(sk, SOCK_NOFCS))) { |
| 1888 | if (!netif_supports_nofcs(dev)) { |
| 1889 | err = -EPROTONOSUPPORT; |
| 1890 | goto out_unlock; |
| 1891 | } |
| 1892 | extra_len = 4; /* We're doing our own CRC */ |
| 1893 | } |
| 1894 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1895 | err = -EMSGSIZE; |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 1896 | if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1897 | goto out_unlock; |
| 1898 | |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1899 | if (!skb) { |
| 1900 | size_t reserved = LL_RESERVED_SPACE(dev); |
Herbert Xu | 4ce4091 | 2011-11-18 02:20:05 +0000 | [diff] [blame] | 1901 | int tlen = dev->needed_tailroom; |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1902 | unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1903 | |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1904 | rcu_read_unlock(); |
Herbert Xu | 4ce4091 | 2011-11-18 02:20:05 +0000 | [diff] [blame] | 1905 | skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL); |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1906 | if (skb == NULL) |
| 1907 | return -ENOBUFS; |
| 1908 | /* FIXME: Save some space for broken drivers that write a hard |
| 1909 | * header at transmission time by themselves. PPP is the notable |
| 1910 | * one here. This should really be fixed at the driver level. |
| 1911 | */ |
| 1912 | skb_reserve(skb, reserved); |
| 1913 | skb_reset_network_header(skb); |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1914 | |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1915 | /* Try to align data part correctly */ |
| 1916 | if (hhlen) { |
| 1917 | skb->data -= hhlen; |
| 1918 | skb->tail -= hhlen; |
| 1919 | if (len < hhlen) |
| 1920 | skb_reset_network_header(skb); |
| 1921 | } |
Al Viro | 6ce8e9c | 2014-04-06 21:25:44 -0400 | [diff] [blame] | 1922 | err = memcpy_from_msg(skb_put(skb, len), msg, len); |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1923 | if (err) |
| 1924 | goto out_free; |
| 1925 | goto retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1926 | } |
| 1927 | |
Willem de Bruijn | 9ed988c | 2016-03-09 21:58:34 -0500 | [diff] [blame] | 1928 | if (!dev_validate_header(dev, skb->data, len)) { |
| 1929 | err = -EINVAL; |
| 1930 | goto out_unlock; |
| 1931 | } |
Daniel Borkmann | 3c70c13 | 2015-11-11 23:25:42 +0100 | [diff] [blame] | 1932 | if (len > (dev->mtu + dev->hard_header_len + extra_len) && |
| 1933 | !packet_extra_vlan_len_allowed(dev, skb)) { |
| 1934 | err = -EMSGSIZE; |
| 1935 | goto out_unlock; |
Ben Greear | 57f89bf | 2011-02-11 09:35:18 +0000 | [diff] [blame] | 1936 | } |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1937 | |
Yoshihiro Shimoda | edbe774 | 2016-07-19 14:40:51 +0900 | [diff] [blame] | 1938 | sockc.tsflags = sk->sk_tsflags; |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 1939 | if (msg->msg_controllen) { |
| 1940 | err = sock_cmsg_send(sk, msg, &sockc); |
Soheil Hassas Yeganeh | f8e7718 | 2016-07-20 18:01:18 -0400 | [diff] [blame] | 1941 | if (unlikely(err)) |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 1942 | goto out_unlock; |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 1943 | } |
| 1944 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | skb->protocol = proto; |
| 1946 | skb->dev = dev; |
| 1947 | skb->priority = sk->sk_priority; |
Eric Dumazet | 2d37a18 | 2009-10-01 19:14:46 +0000 | [diff] [blame] | 1948 | skb->mark = sk->sk_mark; |
Daniel Borkmann | bf84a01 | 2013-04-14 08:08:13 +0000 | [diff] [blame] | 1949 | |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 1950 | sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1951 | |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 1952 | if (unlikely(extra_len == 4)) |
| 1953 | skb->no_fcs = 1; |
| 1954 | |
Jason Wang | 40893fd | 2013-03-26 23:11:22 +0000 | [diff] [blame] | 1955 | skb_probe_transport_header(skb, 0); |
Jason Wang | c1aad27 | 2013-03-25 20:19:57 +0000 | [diff] [blame] | 1956 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1957 | dev_queue_xmit(skb); |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 1958 | rcu_read_unlock(); |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1959 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1961 | out_unlock: |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 1962 | rcu_read_unlock(); |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1963 | out_free: |
| 1964 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1965 | return err; |
| 1966 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1967 | |
Alexei Starovoitov | ff936a0 | 2015-10-07 10:55:41 -0700 | [diff] [blame] | 1968 | static unsigned int run_filter(struct sk_buff *skb, |
| 1969 | const struct sock *sk, |
| 1970 | unsigned int res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1971 | { |
| 1972 | struct sk_filter *filter; |
| 1973 | |
Eric Dumazet | 80f8f10 | 2011-01-18 07:46:52 +0000 | [diff] [blame] | 1974 | rcu_read_lock(); |
| 1975 | filter = rcu_dereference(sk->sk_filter); |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1976 | if (filter != NULL) |
Alexei Starovoitov | ff936a0 | 2015-10-07 10:55:41 -0700 | [diff] [blame] | 1977 | res = bpf_prog_run_clear_cb(filter->prog, skb); |
Eric Dumazet | 80f8f10 | 2011-01-18 07:46:52 +0000 | [diff] [blame] | 1978 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1979 | |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1980 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1981 | } |
| 1982 | |
Willem de Bruijn | 16cc140 | 2016-02-03 18:02:14 -0500 | [diff] [blame] | 1983 | static int __packet_rcv_vnet(const struct sk_buff *skb, |
| 1984 | struct virtio_net_hdr *vnet_hdr) |
| 1985 | { |
| 1986 | *vnet_hdr = (const struct virtio_net_hdr) { 0 }; |
| 1987 | |
Jason Wang | 1e7cbb4 | 2017-01-20 14:32:42 +0800 | [diff] [blame] | 1988 | if (virtio_net_hdr_from_skb(skb, vnet_hdr, vio_le(), true)) |
Mike Rapoport | 1276f24 | 2016-06-08 16:09:22 +0300 | [diff] [blame] | 1989 | BUG(); |
Willem de Bruijn | 16cc140 | 2016-02-03 18:02:14 -0500 | [diff] [blame] | 1990 | |
| 1991 | return 0; |
| 1992 | } |
| 1993 | |
| 1994 | static int packet_rcv_vnet(struct msghdr *msg, const struct sk_buff *skb, |
| 1995 | size_t *len) |
| 1996 | { |
| 1997 | struct virtio_net_hdr vnet_hdr; |
| 1998 | |
| 1999 | if (*len < sizeof(vnet_hdr)) |
| 2000 | return -EINVAL; |
| 2001 | *len -= sizeof(vnet_hdr); |
| 2002 | |
| 2003 | if (__packet_rcv_vnet(skb, &vnet_hdr)) |
| 2004 | return -EINVAL; |
| 2005 | |
| 2006 | return memcpy_to_msg(msg, (void *)&vnet_hdr, sizeof(vnet_hdr)); |
| 2007 | } |
| 2008 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2009 | /* |
Eric Dumazet | 62ab081 | 2010-12-06 20:50:09 +0000 | [diff] [blame] | 2010 | * This function makes lazy skb cloning in hope that most of packets |
| 2011 | * are discarded by BPF. |
| 2012 | * |
| 2013 | * Note tricky part: we DO mangle shared skb! skb->data, skb->len |
| 2014 | * and skb->cb are mangled. It works because (and until) packets |
| 2015 | * falling here are owned by current CPU. Output packets are cloned |
| 2016 | * by dev_queue_xmit_nit(), input packets are processed by net_bh |
| 2017 | * sequencially, so that if we return skb to original state on exit, |
| 2018 | * we will not harm anyone. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | */ |
| 2020 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2021 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
| 2022 | struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2023 | { |
| 2024 | struct sock *sk; |
| 2025 | struct sockaddr_ll *sll; |
| 2026 | struct packet_sock *po; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2027 | u8 *skb_head = skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | int skb_len = skb->len; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 2029 | unsigned int snaplen, res; |
Weongyo Jeong | da37845 | 2016-04-14 14:10:04 -0700 | [diff] [blame] | 2030 | bool is_drop_n_account = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2031 | |
| 2032 | if (skb->pkt_type == PACKET_LOOPBACK) |
| 2033 | goto drop; |
| 2034 | |
| 2035 | sk = pt->af_packet_priv; |
| 2036 | po = pkt_sk(sk); |
| 2037 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 2038 | if (!net_eq(dev_net(dev), sock_net(sk))) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 2039 | goto drop; |
| 2040 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2041 | skb->dev = dev; |
| 2042 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 2043 | if (dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2044 | /* The device has an explicit notion of ll header, |
Eric Dumazet | 62ab081 | 2010-12-06 20:50:09 +0000 | [diff] [blame] | 2045 | * exported to higher levels. |
| 2046 | * |
| 2047 | * Otherwise, the device hides details of its frame |
| 2048 | * structure, so that corresponding packet head is |
| 2049 | * never delivered to user. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | */ |
| 2051 | if (sk->sk_type != SOCK_DGRAM) |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 2052 | skb_push(skb, skb->data - skb_mac_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2053 | else if (skb->pkt_type == PACKET_OUTGOING) { |
| 2054 | /* Special case: outgoing packets have ll header at head */ |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 2055 | skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2056 | } |
| 2057 | } |
| 2058 | |
| 2059 | snaplen = skb->len; |
| 2060 | |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 2061 | res = run_filter(skb, sk, snaplen); |
| 2062 | if (!res) |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 2063 | goto drop_n_restore; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 2064 | if (snaplen > res) |
| 2065 | snaplen = res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2066 | |
Eric Dumazet | 0fd7bac | 2011-12-21 07:11:44 +0000 | [diff] [blame] | 2067 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2068 | goto drop_n_acct; |
| 2069 | |
| 2070 | if (skb_shared(skb)) { |
| 2071 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); |
| 2072 | if (nskb == NULL) |
| 2073 | goto drop_n_acct; |
| 2074 | |
| 2075 | if (skb_head != skb->data) { |
| 2076 | skb->data = skb_head; |
| 2077 | skb->len = skb_len; |
| 2078 | } |
Eric Dumazet | abc4e4f | 2012-04-19 02:24:42 +0000 | [diff] [blame] | 2079 | consume_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2080 | skb = nskb; |
| 2081 | } |
| 2082 | |
Eyal Birger | b4772ef | 2015-03-01 14:58:29 +0200 | [diff] [blame] | 2083 | sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8); |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 2084 | |
| 2085 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2086 | sll->sll_hatype = dev->type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2087 | sll->sll_pkttype = skb->pkt_type; |
Peter P Waskiewicz Jr | 8032b46 | 2007-11-10 22:03:25 -0800 | [diff] [blame] | 2088 | if (unlikely(po->origdev)) |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 2089 | sll->sll_ifindex = orig_dev->ifindex; |
| 2090 | else |
| 2091 | sll->sll_ifindex = dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2092 | |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 2093 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2094 | |
Eyal Birger | 2472d76 | 2015-03-01 14:58:28 +0200 | [diff] [blame] | 2095 | /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg(). |
| 2096 | * Use their space for storing the original skb length. |
| 2097 | */ |
| 2098 | PACKET_SKB_CB(skb)->sa.origlen = skb->len; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 2099 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2100 | if (pskb_trim(skb, snaplen)) |
| 2101 | goto drop_n_acct; |
| 2102 | |
| 2103 | skb_set_owner_r(skb, sk); |
| 2104 | skb->dev = NULL; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 2105 | skb_dst_drop(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | |
Phil Oester | 84531c2 | 2005-07-12 11:57:52 -0700 | [diff] [blame] | 2107 | /* drop conntrack reference */ |
| 2108 | nf_reset(skb); |
| 2109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2110 | spin_lock(&sk->sk_receive_queue.lock); |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 2111 | po->stats.stats1.tp_packets++; |
Eyal Birger | 3bc3b96 | 2015-03-01 14:58:30 +0200 | [diff] [blame] | 2112 | sock_skb_set_dropcount(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2113 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
| 2114 | spin_unlock(&sk->sk_receive_queue.lock); |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 2115 | sk->sk_data_ready(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2116 | return 0; |
| 2117 | |
| 2118 | drop_n_acct: |
Weongyo Jeong | da37845 | 2016-04-14 14:10:04 -0700 | [diff] [blame] | 2119 | is_drop_n_account = true; |
Willem de Bruijn | 7091fbd | 2011-09-30 10:38:28 +0000 | [diff] [blame] | 2120 | spin_lock(&sk->sk_receive_queue.lock); |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 2121 | po->stats.stats1.tp_drops++; |
Willem de Bruijn | 7091fbd | 2011-09-30 10:38:28 +0000 | [diff] [blame] | 2122 | atomic_inc(&sk->sk_drops); |
| 2123 | spin_unlock(&sk->sk_receive_queue.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2124 | |
| 2125 | drop_n_restore: |
| 2126 | if (skb_head != skb->data && skb_shared(skb)) { |
| 2127 | skb->data = skb_head; |
| 2128 | skb->len = skb_len; |
| 2129 | } |
| 2130 | drop: |
Weongyo Jeong | da37845 | 2016-04-14 14:10:04 -0700 | [diff] [blame] | 2131 | if (!is_drop_n_account) |
| 2132 | consume_skb(skb); |
| 2133 | else |
| 2134 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | return 0; |
| 2136 | } |
| 2137 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2138 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
| 2139 | struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2140 | { |
| 2141 | struct sock *sk; |
| 2142 | struct packet_sock *po; |
| 2143 | struct sockaddr_ll *sll; |
Daniel Borkmann | 184f489 | 2013-04-16 01:57:46 +0000 | [diff] [blame] | 2144 | union tpacket_uhdr h; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2145 | u8 *skb_head = skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2146 | int skb_len = skb->len; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 2147 | unsigned int snaplen, res; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2148 | unsigned long status = TP_STATUS_USER; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 2149 | unsigned short macoff, netoff, hdrlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2150 | struct sk_buff *copy_skb = NULL; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 2151 | struct timespec ts; |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 2152 | __u32 ts_status; |
Weongyo Jeong | da37845 | 2016-04-14 14:10:04 -0700 | [diff] [blame] | 2153 | bool is_drop_n_account = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2154 | |
Atzm Watanabe | 5184635 | 2013-12-17 22:53:32 +0900 | [diff] [blame] | 2155 | /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT. |
| 2156 | * We may add members to them until current aligned size without forcing |
| 2157 | * userspace to call getsockopt(..., PACKET_HDRLEN, ...). |
| 2158 | */ |
| 2159 | BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32); |
| 2160 | BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48); |
| 2161 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2162 | if (skb->pkt_type == PACKET_LOOPBACK) |
| 2163 | goto drop; |
| 2164 | |
| 2165 | sk = pt->af_packet_priv; |
| 2166 | po = pkt_sk(sk); |
| 2167 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 2168 | if (!net_eq(dev_net(dev), sock_net(sk))) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 2169 | goto drop; |
| 2170 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 2171 | if (dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2172 | if (sk->sk_type != SOCK_DGRAM) |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 2173 | skb_push(skb, skb->data - skb_mac_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2174 | else if (skb->pkt_type == PACKET_OUTGOING) { |
| 2175 | /* Special case: outgoing packets have ll header at head */ |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 2176 | skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2177 | } |
| 2178 | } |
| 2179 | |
| 2180 | snaplen = skb->len; |
| 2181 | |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 2182 | res = run_filter(skb, sk, snaplen); |
| 2183 | if (!res) |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 2184 | goto drop_n_restore; |
Alexander Drozdov | 68c2e5d | 2015-03-23 09:11:12 +0300 | [diff] [blame] | 2185 | |
| 2186 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
| 2187 | status |= TP_STATUS_CSUMNOTREADY; |
Alexander Drozdov | 682f048 | 2015-03-23 09:11:13 +0300 | [diff] [blame] | 2188 | else if (skb->pkt_type != PACKET_OUTGOING && |
| 2189 | (skb->ip_summed == CHECKSUM_COMPLETE || |
| 2190 | skb_csum_unnecessary(skb))) |
| 2191 | status |= TP_STATUS_CSUM_VALID; |
Alexander Drozdov | 68c2e5d | 2015-03-23 09:11:12 +0300 | [diff] [blame] | 2192 | |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 2193 | if (snaplen > res) |
| 2194 | snaplen = res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2195 | |
| 2196 | if (sk->sk_type == SOCK_DGRAM) { |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 2197 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
| 2198 | po->tp_reserve; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2199 | } else { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 2200 | unsigned int maclen = skb_network_offset(skb); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 2201 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 2202 | (maclen < 16 ? 16 : maclen)) + |
Willem de Bruijn | 58d19b1 | 2016-02-03 18:02:15 -0500 | [diff] [blame] | 2203 | po->tp_reserve; |
| 2204 | if (po->has_vnet_hdr) |
| 2205 | netoff += sizeof(struct virtio_net_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2206 | macoff = netoff - maclen; |
| 2207 | } |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2208 | if (po->tp_version <= TPACKET_V2) { |
| 2209 | if (macoff + snaplen > po->rx_ring.frame_size) { |
| 2210 | if (po->copy_thresh && |
Eric Dumazet | 0fd7bac | 2011-12-21 07:11:44 +0000 | [diff] [blame] | 2211 | atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2212 | if (skb_shared(skb)) { |
| 2213 | copy_skb = skb_clone(skb, GFP_ATOMIC); |
| 2214 | } else { |
| 2215 | copy_skb = skb_get(skb); |
| 2216 | skb_head = skb->data; |
| 2217 | } |
| 2218 | if (copy_skb) |
| 2219 | skb_set_owner_r(copy_skb, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2220 | } |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2221 | snaplen = po->rx_ring.frame_size - macoff; |
| 2222 | if ((int)snaplen < 0) |
| 2223 | snaplen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2224 | } |
Eric Dumazet | dc80811 | 2014-08-15 09:16:04 -0700 | [diff] [blame] | 2225 | } else if (unlikely(macoff + snaplen > |
| 2226 | GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) { |
| 2227 | u32 nval; |
| 2228 | |
| 2229 | nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff; |
| 2230 | pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n", |
| 2231 | snaplen, nval, macoff); |
| 2232 | snaplen = nval; |
| 2233 | if (unlikely((int)snaplen < 0)) { |
| 2234 | snaplen = 0; |
| 2235 | macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len; |
| 2236 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2237 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2238 | spin_lock(&sk->sk_receive_queue.lock); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2239 | h.raw = packet_current_rx_frame(po, skb, |
| 2240 | TP_STATUS_KERNEL, (macoff+snaplen)); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 2241 | if (!h.raw) |
Willem de Bruijn | 58d19b1 | 2016-02-03 18:02:15 -0500 | [diff] [blame] | 2242 | goto drop_n_account; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2243 | if (po->tp_version <= TPACKET_V2) { |
| 2244 | packet_increment_rx_head(po, &po->rx_ring); |
| 2245 | /* |
| 2246 | * LOSING will be reported till you read the stats, |
| 2247 | * because it's COR - Clear On Read. |
| 2248 | * Anyways, moving it for V1/V2 only as V3 doesn't need this |
| 2249 | * at packet level. |
| 2250 | */ |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 2251 | if (po->stats.stats1.tp_drops) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2252 | status |= TP_STATUS_LOSING; |
| 2253 | } |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 2254 | po->stats.stats1.tp_packets++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2255 | if (copy_skb) { |
| 2256 | status |= TP_STATUS_COPY; |
| 2257 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); |
| 2258 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2259 | spin_unlock(&sk->sk_receive_queue.lock); |
| 2260 | |
Willem de Bruijn | 58d19b1 | 2016-02-03 18:02:15 -0500 | [diff] [blame] | 2261 | if (po->has_vnet_hdr) { |
| 2262 | if (__packet_rcv_vnet(skb, h.raw + macoff - |
| 2263 | sizeof(struct virtio_net_hdr))) { |
| 2264 | spin_lock(&sk->sk_receive_queue.lock); |
| 2265 | goto drop_n_account; |
| 2266 | } |
| 2267 | } |
| 2268 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 2269 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 2270 | |
| 2271 | if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp))) |
Daniel Borkmann | 7a51384 | 2013-04-23 00:39:29 +0000 | [diff] [blame] | 2272 | getnstimeofday(&ts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2273 | |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 2274 | status |= ts_status; |
| 2275 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 2276 | switch (po->tp_version) { |
| 2277 | case TPACKET_V1: |
| 2278 | h.h1->tp_len = skb->len; |
| 2279 | h.h1->tp_snaplen = snaplen; |
| 2280 | h.h1->tp_mac = macoff; |
| 2281 | h.h1->tp_net = netoff; |
Daniel Borkmann | 4b457bd | 2013-04-16 01:29:11 +0000 | [diff] [blame] | 2282 | h.h1->tp_sec = ts.tv_sec; |
| 2283 | h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 2284 | hdrlen = sizeof(*h.h1); |
| 2285 | break; |
| 2286 | case TPACKET_V2: |
| 2287 | h.h2->tp_len = skb->len; |
| 2288 | h.h2->tp_snaplen = snaplen; |
| 2289 | h.h2->tp_mac = macoff; |
| 2290 | h.h2->tp_net = netoff; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 2291 | h.h2->tp_sec = ts.tv_sec; |
| 2292 | h.h2->tp_nsec = ts.tv_nsec; |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 2293 | if (skb_vlan_tag_present(skb)) { |
| 2294 | h.h2->tp_vlan_tci = skb_vlan_tag_get(skb); |
Atzm Watanabe | a0cdfcf | 2013-12-17 22:53:40 +0900 | [diff] [blame] | 2295 | h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto); |
| 2296 | status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID; |
Ben Greear | a3bcc23 | 2011-06-01 06:49:10 +0000 | [diff] [blame] | 2297 | } else { |
| 2298 | h.h2->tp_vlan_tci = 0; |
Atzm Watanabe | a0cdfcf | 2013-12-17 22:53:40 +0900 | [diff] [blame] | 2299 | h.h2->tp_vlan_tpid = 0; |
Ben Greear | a3bcc23 | 2011-06-01 06:49:10 +0000 | [diff] [blame] | 2300 | } |
Atzm Watanabe | e4d26f4 | 2013-12-17 22:53:36 +0900 | [diff] [blame] | 2301 | memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding)); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 2302 | hdrlen = sizeof(*h.h2); |
| 2303 | break; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2304 | case TPACKET_V3: |
| 2305 | /* tp_nxt_offset,vlan are already populated above. |
| 2306 | * So DONT clear those fields here |
| 2307 | */ |
| 2308 | h.h3->tp_status |= status; |
| 2309 | h.h3->tp_len = skb->len; |
| 2310 | h.h3->tp_snaplen = snaplen; |
| 2311 | h.h3->tp_mac = macoff; |
| 2312 | h.h3->tp_net = netoff; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2313 | h.h3->tp_sec = ts.tv_sec; |
| 2314 | h.h3->tp_nsec = ts.tv_nsec; |
Atzm Watanabe | e4d26f4 | 2013-12-17 22:53:36 +0900 | [diff] [blame] | 2315 | memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding)); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2316 | hdrlen = sizeof(*h.h3); |
| 2317 | break; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 2318 | default: |
| 2319 | BUG(); |
| 2320 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2321 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 2322 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 2323 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2324 | sll->sll_family = AF_PACKET; |
| 2325 | sll->sll_hatype = dev->type; |
| 2326 | sll->sll_protocol = skb->protocol; |
| 2327 | sll->sll_pkttype = skb->pkt_type; |
Peter P Waskiewicz Jr | 8032b46 | 2007-11-10 22:03:25 -0800 | [diff] [blame] | 2328 | if (unlikely(po->origdev)) |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 2329 | sll->sll_ifindex = orig_dev->ifindex; |
| 2330 | else |
| 2331 | sll->sll_ifindex = dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2332 | |
Ralf Baechle | e16aa20 | 2006-12-07 00:11:33 -0800 | [diff] [blame] | 2333 | smp_mb(); |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 2334 | |
Changli Gao | f6dafa9 | 2010-12-07 04:26:16 +0000 | [diff] [blame] | 2335 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 2336 | if (po->tp_version <= TPACKET_V2) { |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 2337 | u8 *start, *end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2338 | |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 2339 | end = (u8 *) PAGE_ALIGN((unsigned long) h.raw + |
| 2340 | macoff + snaplen); |
| 2341 | |
| 2342 | for (start = h.raw; start < end; start += PAGE_SIZE) |
| 2343 | flush_dcache_page(pgv_to_page(start)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2344 | } |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 2345 | smp_wmb(); |
Changli Gao | f6dafa9 | 2010-12-07 04:26:16 +0000 | [diff] [blame] | 2346 | #endif |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 2347 | |
Dan Collins | da413ee | 2014-12-19 16:49:25 +1300 | [diff] [blame] | 2348 | if (po->tp_version <= TPACKET_V2) { |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2349 | __packet_set_status(po, h.raw, status); |
Dan Collins | da413ee | 2014-12-19 16:49:25 +1300 | [diff] [blame] | 2350 | sk->sk_data_ready(sk); |
| 2351 | } else { |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2352 | prb_clear_blk_fill_status(&po->rx_ring); |
Dan Collins | da413ee | 2014-12-19 16:49:25 +1300 | [diff] [blame] | 2353 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2354 | |
| 2355 | drop_n_restore: |
| 2356 | if (skb_head != skb->data && skb_shared(skb)) { |
| 2357 | skb->data = skb_head; |
| 2358 | skb->len = skb_len; |
| 2359 | } |
| 2360 | drop: |
Weongyo Jeong | da37845 | 2016-04-14 14:10:04 -0700 | [diff] [blame] | 2361 | if (!is_drop_n_account) |
| 2362 | consume_skb(skb); |
| 2363 | else |
| 2364 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2365 | return 0; |
| 2366 | |
Willem de Bruijn | 58d19b1 | 2016-02-03 18:02:15 -0500 | [diff] [blame] | 2367 | drop_n_account: |
Weongyo Jeong | da37845 | 2016-04-14 14:10:04 -0700 | [diff] [blame] | 2368 | is_drop_n_account = true; |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 2369 | po->stats.stats1.tp_drops++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2370 | spin_unlock(&sk->sk_receive_queue.lock); |
| 2371 | |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 2372 | sk->sk_data_ready(sk); |
Wei Yongjun | acb5d75 | 2009-02-25 00:36:42 +0000 | [diff] [blame] | 2373 | kfree_skb(copy_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2374 | goto drop_n_restore; |
| 2375 | } |
| 2376 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2377 | static void tpacket_destruct_skb(struct sk_buff *skb) |
| 2378 | { |
| 2379 | struct packet_sock *po = pkt_sk(skb->sk); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2380 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2381 | if (likely(po->tx_ring.pg_vec)) { |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 2382 | void *ph; |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 2383 | __u32 ts; |
| 2384 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2385 | ph = skb_shinfo(skb)->destructor_arg; |
Daniel Borkmann | b013840 | 2014-01-15 16:25:36 +0100 | [diff] [blame] | 2386 | packet_dec_pending(&po->tx_ring); |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 2387 | |
| 2388 | ts = __packet_set_timestamp(po, ph, skb); |
| 2389 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2390 | } |
| 2391 | |
| 2392 | sock_wfree(skb); |
| 2393 | } |
| 2394 | |
Daniel Borkmann | c72219b | 2015-11-11 23:25:43 +0100 | [diff] [blame] | 2395 | static void tpacket_set_protocol(const struct net_device *dev, |
| 2396 | struct sk_buff *skb) |
| 2397 | { |
| 2398 | if (dev->type == ARPHRD_ETHER) { |
| 2399 | skb_reset_mac_header(skb); |
| 2400 | skb->protocol = eth_hdr(skb)->h_proto; |
| 2401 | } |
| 2402 | } |
| 2403 | |
Willem de Bruijn | 16cc140 | 2016-02-03 18:02:14 -0500 | [diff] [blame] | 2404 | static int __packet_snd_vnet_parse(struct virtio_net_hdr *vnet_hdr, size_t len) |
| 2405 | { |
| 2406 | unsigned short gso_type = 0; |
| 2407 | |
| 2408 | if ((vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
| 2409 | (__virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) + |
| 2410 | __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2 > |
| 2411 | __virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len))) |
| 2412 | vnet_hdr->hdr_len = __cpu_to_virtio16(vio_le(), |
| 2413 | __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) + |
| 2414 | __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2); |
| 2415 | |
| 2416 | if (__virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len) > len) |
| 2417 | return -EINVAL; |
| 2418 | |
| 2419 | if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
| 2420 | switch (vnet_hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
| 2421 | case VIRTIO_NET_HDR_GSO_TCPV4: |
| 2422 | gso_type = SKB_GSO_TCPV4; |
| 2423 | break; |
| 2424 | case VIRTIO_NET_HDR_GSO_TCPV6: |
| 2425 | gso_type = SKB_GSO_TCPV6; |
| 2426 | break; |
| 2427 | case VIRTIO_NET_HDR_GSO_UDP: |
| 2428 | gso_type = SKB_GSO_UDP; |
| 2429 | break; |
| 2430 | default: |
| 2431 | return -EINVAL; |
| 2432 | } |
| 2433 | |
| 2434 | if (vnet_hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) |
| 2435 | gso_type |= SKB_GSO_TCP_ECN; |
| 2436 | |
| 2437 | if (vnet_hdr->gso_size == 0) |
| 2438 | return -EINVAL; |
| 2439 | } |
| 2440 | |
| 2441 | vnet_hdr->gso_type = gso_type; /* changes type, temporary storage */ |
| 2442 | return 0; |
| 2443 | } |
| 2444 | |
| 2445 | static int packet_snd_vnet_parse(struct msghdr *msg, size_t *len, |
| 2446 | struct virtio_net_hdr *vnet_hdr) |
| 2447 | { |
| 2448 | int n; |
| 2449 | |
| 2450 | if (*len < sizeof(*vnet_hdr)) |
| 2451 | return -EINVAL; |
| 2452 | *len -= sizeof(*vnet_hdr); |
| 2453 | |
| 2454 | n = copy_from_iter(vnet_hdr, sizeof(*vnet_hdr), &msg->msg_iter); |
| 2455 | if (n != sizeof(*vnet_hdr)) |
| 2456 | return -EFAULT; |
| 2457 | |
| 2458 | return __packet_snd_vnet_parse(vnet_hdr, *len); |
| 2459 | } |
| 2460 | |
| 2461 | static int packet_snd_vnet_gso(struct sk_buff *skb, |
| 2462 | struct virtio_net_hdr *vnet_hdr) |
| 2463 | { |
| 2464 | if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
| 2465 | u16 s = __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start); |
| 2466 | u16 o = __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset); |
| 2467 | |
| 2468 | if (!skb_partial_csum_set(skb, s, o)) |
| 2469 | return -EINVAL; |
| 2470 | } |
| 2471 | |
| 2472 | skb_shinfo(skb)->gso_size = |
| 2473 | __virtio16_to_cpu(vio_le(), vnet_hdr->gso_size); |
| 2474 | skb_shinfo(skb)->gso_type = vnet_hdr->gso_type; |
| 2475 | |
| 2476 | /* Header must be checked, and gso_segs computed. */ |
| 2477 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; |
| 2478 | skb_shinfo(skb)->gso_segs = 0; |
| 2479 | return 0; |
| 2480 | } |
| 2481 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2482 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
Willem de Bruijn | 8d39b4a | 2016-02-03 18:02:16 -0500 | [diff] [blame] | 2483 | void *frame, struct net_device *dev, void *data, int tp_len, |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 2484 | __be16 proto, unsigned char *addr, int hlen, int copylen, |
| 2485 | const struct sockcm_cookie *sockc) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2486 | { |
Daniel Borkmann | 184f489 | 2013-04-16 01:57:46 +0000 | [diff] [blame] | 2487 | union tpacket_uhdr ph; |
Willem de Bruijn | 8d39b4a | 2016-02-03 18:02:16 -0500 | [diff] [blame] | 2488 | int to_write, offset, len, nr_frags, len_max; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2489 | struct socket *sock = po->sk.sk_socket; |
| 2490 | struct page *page; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2491 | int err; |
| 2492 | |
| 2493 | ph.raw = frame; |
| 2494 | |
| 2495 | skb->protocol = proto; |
| 2496 | skb->dev = dev; |
| 2497 | skb->priority = po->sk.sk_priority; |
Eric Dumazet | 2d37a18 | 2009-10-01 19:14:46 +0000 | [diff] [blame] | 2498 | skb->mark = po->sk.sk_mark; |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 2499 | sock_tx_timestamp(&po->sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2500 | skb_shinfo(skb)->destructor_arg = ph.raw; |
| 2501 | |
Herbert Xu | ae64194 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 2502 | skb_reserve(skb, hlen); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2503 | skb_reset_network_header(skb); |
Jason Wang | c1aad27 | 2013-03-25 20:19:57 +0000 | [diff] [blame] | 2504 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2505 | to_write = tp_len; |
| 2506 | |
| 2507 | if (sock->type == SOCK_DGRAM) { |
| 2508 | err = dev_hard_header(skb, dev, ntohs(proto), addr, |
| 2509 | NULL, tp_len); |
| 2510 | if (unlikely(err < 0)) |
| 2511 | return -EINVAL; |
Willem de Bruijn | 1d036d2 | 2016-02-03 18:02:17 -0500 | [diff] [blame] | 2512 | } else if (copylen) { |
Willem de Bruijn | 9ed988c | 2016-03-09 21:58:34 -0500 | [diff] [blame] | 2513 | int hdrlen = min_t(int, copylen, tp_len); |
| 2514 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2515 | skb_push(skb, dev->hard_header_len); |
Willem de Bruijn | 1d036d2 | 2016-02-03 18:02:17 -0500 | [diff] [blame] | 2516 | skb_put(skb, copylen - dev->hard_header_len); |
Willem de Bruijn | 9ed988c | 2016-03-09 21:58:34 -0500 | [diff] [blame] | 2517 | err = skb_store_bits(skb, 0, data, hdrlen); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2518 | if (unlikely(err)) |
| 2519 | return err; |
Willem de Bruijn | 9ed988c | 2016-03-09 21:58:34 -0500 | [diff] [blame] | 2520 | if (!dev_validate_header(dev, skb->data, hdrlen)) |
| 2521 | return -EINVAL; |
Daniel Borkmann | c72219b | 2015-11-11 23:25:43 +0100 | [diff] [blame] | 2522 | if (!skb->protocol) |
| 2523 | tpacket_set_protocol(dev, skb); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2524 | |
Willem de Bruijn | 9ed988c | 2016-03-09 21:58:34 -0500 | [diff] [blame] | 2525 | data += hdrlen; |
| 2526 | to_write -= hdrlen; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2527 | } |
| 2528 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2529 | offset = offset_in_page(data); |
| 2530 | len_max = PAGE_SIZE - offset; |
| 2531 | len = ((to_write > len_max) ? len_max : to_write); |
| 2532 | |
| 2533 | skb->data_len = to_write; |
| 2534 | skb->len += to_write; |
| 2535 | skb->truesize += to_write; |
| 2536 | atomic_add(to_write, &po->sk.sk_wmem_alloc); |
| 2537 | |
| 2538 | while (likely(to_write)) { |
| 2539 | nr_frags = skb_shinfo(skb)->nr_frags; |
| 2540 | |
| 2541 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2542 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
| 2543 | MAX_SKB_FRAGS); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2544 | return -EFAULT; |
| 2545 | } |
| 2546 | |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 2547 | page = pgv_to_page(data); |
| 2548 | data += len; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2549 | flush_dcache_page(page); |
| 2550 | get_page(page); |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 2551 | skb_fill_page_desc(skb, nr_frags, page, offset, len); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2552 | to_write -= len; |
| 2553 | offset = 0; |
| 2554 | len_max = PAGE_SIZE; |
| 2555 | len = ((to_write > len_max) ? len_max : to_write); |
| 2556 | } |
| 2557 | |
Daniel Borkmann | 8fd6c80 | 2015-11-11 23:25:41 +0100 | [diff] [blame] | 2558 | skb_probe_transport_header(skb, 0); |
Daniel Borkmann | efdfa2f | 2015-11-11 23:25:40 +0100 | [diff] [blame] | 2559 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2560 | return tp_len; |
| 2561 | } |
| 2562 | |
Willem de Bruijn | 8d39b4a | 2016-02-03 18:02:16 -0500 | [diff] [blame] | 2563 | static int tpacket_parse_header(struct packet_sock *po, void *frame, |
| 2564 | int size_max, void **data) |
| 2565 | { |
| 2566 | union tpacket_uhdr ph; |
| 2567 | int tp_len, off; |
| 2568 | |
| 2569 | ph.raw = frame; |
| 2570 | |
| 2571 | switch (po->tp_version) { |
| 2572 | case TPACKET_V2: |
| 2573 | tp_len = ph.h2->tp_len; |
| 2574 | break; |
| 2575 | default: |
| 2576 | tp_len = ph.h1->tp_len; |
| 2577 | break; |
| 2578 | } |
| 2579 | if (unlikely(tp_len > size_max)) { |
| 2580 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); |
| 2581 | return -EMSGSIZE; |
| 2582 | } |
| 2583 | |
| 2584 | if (unlikely(po->tp_tx_has_off)) { |
| 2585 | int off_min, off_max; |
| 2586 | |
| 2587 | off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll); |
| 2588 | off_max = po->tx_ring.frame_size - tp_len; |
| 2589 | if (po->sk.sk_type == SOCK_DGRAM) { |
| 2590 | switch (po->tp_version) { |
| 2591 | case TPACKET_V2: |
| 2592 | off = ph.h2->tp_net; |
| 2593 | break; |
| 2594 | default: |
| 2595 | off = ph.h1->tp_net; |
| 2596 | break; |
| 2597 | } |
| 2598 | } else { |
| 2599 | switch (po->tp_version) { |
| 2600 | case TPACKET_V2: |
| 2601 | off = ph.h2->tp_mac; |
| 2602 | break; |
| 2603 | default: |
| 2604 | off = ph.h1->tp_mac; |
| 2605 | break; |
| 2606 | } |
| 2607 | } |
| 2608 | if (unlikely((off < off_min) || (off_max < off))) |
| 2609 | return -EINVAL; |
| 2610 | } else { |
| 2611 | off = po->tp_hdrlen - sizeof(struct sockaddr_ll); |
| 2612 | } |
| 2613 | |
| 2614 | *data = frame + off; |
| 2615 | return tp_len; |
| 2616 | } |
| 2617 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2618 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) |
| 2619 | { |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2620 | struct sk_buff *skb; |
| 2621 | struct net_device *dev; |
Willem de Bruijn | 1d036d2 | 2016-02-03 18:02:17 -0500 | [diff] [blame] | 2622 | struct virtio_net_hdr *vnet_hdr = NULL; |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 2623 | struct sockcm_cookie sockc; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2624 | __be16 proto; |
David S. Miller | 09effa6 | 2013-08-07 17:11:00 -0700 | [diff] [blame] | 2625 | int err, reserve = 0; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2626 | void *ph; |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 2627 | DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name); |
Daniel Borkmann | 87a2fd2 | 2014-01-15 16:25:35 +0100 | [diff] [blame] | 2628 | bool need_wait = !(msg->msg_flags & MSG_DONTWAIT); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2629 | int tp_len, size_max; |
| 2630 | unsigned char *addr; |
Willem de Bruijn | 8d39b4a | 2016-02-03 18:02:16 -0500 | [diff] [blame] | 2631 | void *data; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2632 | int len_sum = 0; |
danborkmann@iogearbox.net | 9e67030 | 2012-08-20 03:34:03 +0000 | [diff] [blame] | 2633 | int status = TP_STATUS_AVAILABLE; |
Willem de Bruijn | 1d036d2 | 2016-02-03 18:02:17 -0500 | [diff] [blame] | 2634 | int hlen, tlen, copylen = 0; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2635 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2636 | mutex_lock(&po->pg_vec_lock); |
| 2637 | |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 2638 | if (likely(saddr == NULL)) { |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2639 | dev = packet_cached_dev_get(po); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2640 | proto = po->num; |
| 2641 | addr = NULL; |
| 2642 | } else { |
| 2643 | err = -EINVAL; |
| 2644 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) |
| 2645 | goto out; |
| 2646 | if (msg->msg_namelen < (saddr->sll_halen |
| 2647 | + offsetof(struct sockaddr_ll, |
| 2648 | sll_addr))) |
| 2649 | goto out; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2650 | proto = saddr->sll_protocol; |
| 2651 | addr = saddr->sll_addr; |
Ben Greear | 827d978 | 2011-06-01 07:18:53 +0000 | [diff] [blame] | 2652 | dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2653 | } |
| 2654 | |
Yoshihiro Shimoda | edbe774 | 2016-07-19 14:40:51 +0900 | [diff] [blame] | 2655 | sockc.tsflags = po->sk.sk_tsflags; |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 2656 | if (msg->msg_controllen) { |
| 2657 | err = sock_cmsg_send(&po->sk, msg, &sockc); |
| 2658 | if (unlikely(err)) |
| 2659 | goto out; |
| 2660 | } |
| 2661 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2662 | err = -ENXIO; |
| 2663 | if (unlikely(dev == NULL)) |
| 2664 | goto out; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2665 | err = -ENETDOWN; |
| 2666 | if (unlikely(!(dev->flags & IFF_UP))) |
| 2667 | goto out_put; |
| 2668 | |
Daniel Borkmann | 5cfb4c8 | 2015-11-11 23:25:44 +0100 | [diff] [blame] | 2669 | if (po->sk.sk_socket->type == SOCK_RAW) |
| 2670 | reserve = dev->hard_header_len; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2671 | size_max = po->tx_ring.frame_size |
Gabor Gombas | b5dd884 | 2009-10-29 03:19:11 -0700 | [diff] [blame] | 2672 | - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2673 | |
Willem de Bruijn | 1d036d2 | 2016-02-03 18:02:17 -0500 | [diff] [blame] | 2674 | if ((size_max > dev->mtu + reserve + VLAN_HLEN) && !po->has_vnet_hdr) |
Daniel Borkmann | 5cfb4c8 | 2015-11-11 23:25:44 +0100 | [diff] [blame] | 2675 | size_max = dev->mtu + reserve + VLAN_HLEN; |
David S. Miller | 09effa6 | 2013-08-07 17:11:00 -0700 | [diff] [blame] | 2676 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2677 | do { |
| 2678 | ph = packet_current_frame(po, &po->tx_ring, |
Daniel Borkmann | 87a2fd2 | 2014-01-15 16:25:35 +0100 | [diff] [blame] | 2679 | TP_STATUS_SEND_REQUEST); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2680 | if (unlikely(ph == NULL)) { |
Daniel Borkmann | 87a2fd2 | 2014-01-15 16:25:35 +0100 | [diff] [blame] | 2681 | if (need_wait && need_resched()) |
| 2682 | schedule(); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2683 | continue; |
| 2684 | } |
| 2685 | |
Willem de Bruijn | 8d39b4a | 2016-02-03 18:02:16 -0500 | [diff] [blame] | 2686 | skb = NULL; |
| 2687 | tp_len = tpacket_parse_header(po, ph, size_max, &data); |
| 2688 | if (tp_len < 0) |
| 2689 | goto tpacket_error; |
| 2690 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2691 | status = TP_STATUS_SEND_REQUEST; |
Herbert Xu | ae64194 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 2692 | hlen = LL_RESERVED_SPACE(dev); |
| 2693 | tlen = dev->needed_tailroom; |
Willem de Bruijn | 1d036d2 | 2016-02-03 18:02:17 -0500 | [diff] [blame] | 2694 | if (po->has_vnet_hdr) { |
| 2695 | vnet_hdr = data; |
| 2696 | data += sizeof(*vnet_hdr); |
| 2697 | tp_len -= sizeof(*vnet_hdr); |
| 2698 | if (tp_len < 0 || |
| 2699 | __packet_snd_vnet_parse(vnet_hdr, tp_len)) { |
| 2700 | tp_len = -EINVAL; |
| 2701 | goto tpacket_error; |
| 2702 | } |
| 2703 | copylen = __virtio16_to_cpu(vio_le(), |
| 2704 | vnet_hdr->hdr_len); |
| 2705 | } |
Willem de Bruijn | 9ed988c | 2016-03-09 21:58:34 -0500 | [diff] [blame] | 2706 | copylen = max_t(int, copylen, dev->hard_header_len); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2707 | skb = sock_alloc_send_skb(&po->sk, |
Willem de Bruijn | 1d036d2 | 2016-02-03 18:02:17 -0500 | [diff] [blame] | 2708 | hlen + tlen + sizeof(struct sockaddr_ll) + |
| 2709 | (copylen - dev->hard_header_len), |
Kretschmer, Mathias | fbf33a2 | 2015-05-08 15:44:37 +0200 | [diff] [blame] | 2710 | !need_wait, &err); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2711 | |
Kretschmer, Mathias | fbf33a2 | 2015-05-08 15:44:37 +0200 | [diff] [blame] | 2712 | if (unlikely(skb == NULL)) { |
| 2713 | /* we assume the socket was initially writeable ... */ |
| 2714 | if (likely(len_sum > 0)) |
| 2715 | err = len_sum; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2716 | goto out_status; |
Kretschmer, Mathias | fbf33a2 | 2015-05-08 15:44:37 +0200 | [diff] [blame] | 2717 | } |
Willem de Bruijn | 8d39b4a | 2016-02-03 18:02:16 -0500 | [diff] [blame] | 2718 | tp_len = tpacket_fill_skb(po, skb, ph, dev, data, tp_len, proto, |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 2719 | addr, hlen, copylen, &sockc); |
Alexander Drozdov | dbd46ab | 2015-07-28 13:57:01 +0300 | [diff] [blame] | 2720 | if (likely(tp_len >= 0) && |
Daniel Borkmann | 5cfb4c8 | 2015-11-11 23:25:44 +0100 | [diff] [blame] | 2721 | tp_len > dev->mtu + reserve && |
Willem de Bruijn | 1d036d2 | 2016-02-03 18:02:17 -0500 | [diff] [blame] | 2722 | !po->has_vnet_hdr && |
Daniel Borkmann | 3c70c13 | 2015-11-11 23:25:42 +0100 | [diff] [blame] | 2723 | !packet_extra_vlan_len_allowed(dev, skb)) |
| 2724 | tp_len = -EMSGSIZE; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2725 | |
| 2726 | if (unlikely(tp_len < 0)) { |
Willem de Bruijn | 8d39b4a | 2016-02-03 18:02:16 -0500 | [diff] [blame] | 2727 | tpacket_error: |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2728 | if (po->tp_loss) { |
| 2729 | __packet_set_status(po, ph, |
| 2730 | TP_STATUS_AVAILABLE); |
| 2731 | packet_increment_head(&po->tx_ring); |
| 2732 | kfree_skb(skb); |
| 2733 | continue; |
| 2734 | } else { |
| 2735 | status = TP_STATUS_WRONG_FORMAT; |
| 2736 | err = tp_len; |
| 2737 | goto out_status; |
| 2738 | } |
| 2739 | } |
| 2740 | |
Willem de Bruijn | 1d036d2 | 2016-02-03 18:02:17 -0500 | [diff] [blame] | 2741 | if (po->has_vnet_hdr && packet_snd_vnet_gso(skb, vnet_hdr)) { |
| 2742 | tp_len = -EINVAL; |
| 2743 | goto tpacket_error; |
| 2744 | } |
| 2745 | |
Daniel Borkmann | 0fd5d57 | 2014-02-16 15:55:22 +0100 | [diff] [blame] | 2746 | packet_pick_tx_queue(dev, skb); |
| 2747 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2748 | skb->destructor = tpacket_destruct_skb; |
| 2749 | __packet_set_status(po, ph, TP_STATUS_SENDING); |
Daniel Borkmann | b013840 | 2014-01-15 16:25:36 +0100 | [diff] [blame] | 2750 | packet_inc_pending(&po->tx_ring); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2751 | |
| 2752 | status = TP_STATUS_SEND_REQUEST; |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 2753 | err = po->xmit(skb); |
Jarek Poplawski | eb70df1 | 2010-01-10 22:04:19 +0000 | [diff] [blame] | 2754 | if (unlikely(err > 0)) { |
| 2755 | err = net_xmit_errno(err); |
| 2756 | if (err && __packet_get_status(po, ph) == |
| 2757 | TP_STATUS_AVAILABLE) { |
| 2758 | /* skb was destructed already */ |
| 2759 | skb = NULL; |
| 2760 | goto out_status; |
| 2761 | } |
| 2762 | /* |
| 2763 | * skb was dropped but not destructed yet; |
| 2764 | * let's treat it like congestion or err < 0 |
| 2765 | */ |
| 2766 | err = 0; |
| 2767 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2768 | packet_increment_head(&po->tx_ring); |
| 2769 | len_sum += tp_len; |
Daniel Borkmann | b013840 | 2014-01-15 16:25:36 +0100 | [diff] [blame] | 2770 | } while (likely((ph != NULL) || |
| 2771 | /* Note: packet_read_pending() might be slow if we have |
| 2772 | * to call it as it's per_cpu variable, but in fast-path |
| 2773 | * we already short-circuit the loop with the first |
| 2774 | * condition, and luckily don't have to go that path |
| 2775 | * anyway. |
| 2776 | */ |
| 2777 | (need_wait && packet_read_pending(&po->tx_ring)))); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2778 | |
| 2779 | err = len_sum; |
| 2780 | goto out_put; |
| 2781 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2782 | out_status: |
| 2783 | __packet_set_status(po, ph, status); |
| 2784 | kfree_skb(skb); |
| 2785 | out_put: |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2786 | dev_put(dev); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2787 | out: |
| 2788 | mutex_unlock(&po->pg_vec_lock); |
| 2789 | return err; |
| 2790 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2791 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 2792 | static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad, |
| 2793 | size_t reserve, size_t len, |
| 2794 | size_t linear, int noblock, |
| 2795 | int *err) |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2796 | { |
| 2797 | struct sk_buff *skb; |
| 2798 | |
| 2799 | /* Under a page? Don't bother with paged skb. */ |
| 2800 | if (prepad + len < PAGE_SIZE || !linear) |
| 2801 | linear = len; |
| 2802 | |
| 2803 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
Eric Dumazet | 28d6427 | 2013-08-08 14:38:47 -0700 | [diff] [blame] | 2804 | err, 0); |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2805 | if (!skb) |
| 2806 | return NULL; |
| 2807 | |
| 2808 | skb_reserve(skb, reserve); |
| 2809 | skb_put(skb, linear); |
| 2810 | skb->data_len = len - linear; |
| 2811 | skb->len += len - linear; |
| 2812 | |
| 2813 | return skb; |
| 2814 | } |
| 2815 | |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 2816 | static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2817 | { |
| 2818 | struct sock *sk = sock->sk; |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 2819 | DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2820 | struct sk_buff *skb; |
| 2821 | struct net_device *dev; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 2822 | __be16 proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2823 | unsigned char *addr; |
Ben Greear | 827d978 | 2011-06-01 07:18:53 +0000 | [diff] [blame] | 2824 | int err, reserve = 0; |
Edward Jee | c7d39e3 | 2015-10-08 14:56:49 -0700 | [diff] [blame] | 2825 | struct sockcm_cookie sockc; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2826 | struct virtio_net_hdr vnet_hdr = { 0 }; |
| 2827 | int offset = 0; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2828 | struct packet_sock *po = pkt_sk(sk); |
Willem de Bruijn | 8284954 | 2017-02-07 15:57:21 -0500 | [diff] [blame] | 2829 | int hlen, tlen, linear; |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 2830 | int extra_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2831 | |
| 2832 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2833 | * Get and verify the address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2834 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2835 | |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 2836 | if (likely(saddr == NULL)) { |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2837 | dev = packet_cached_dev_get(po); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2838 | proto = po->num; |
| 2839 | addr = NULL; |
| 2840 | } else { |
| 2841 | err = -EINVAL; |
| 2842 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) |
| 2843 | goto out; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 2844 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
| 2845 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2846 | proto = saddr->sll_protocol; |
| 2847 | addr = saddr->sll_addr; |
Ben Greear | 827d978 | 2011-06-01 07:18:53 +0000 | [diff] [blame] | 2848 | dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2849 | } |
| 2850 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2851 | err = -ENXIO; |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2852 | if (unlikely(dev == NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2853 | goto out_unlock; |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2854 | err = -ENETDOWN; |
| 2855 | if (unlikely(!(dev->flags & IFF_UP))) |
| 2856 | goto out_unlock; |
| 2857 | |
Yoshihiro Shimoda | edbe774 | 2016-07-19 14:40:51 +0900 | [diff] [blame] | 2858 | sockc.tsflags = sk->sk_tsflags; |
Edward Jee | c7d39e3 | 2015-10-08 14:56:49 -0700 | [diff] [blame] | 2859 | sockc.mark = sk->sk_mark; |
| 2860 | if (msg->msg_controllen) { |
| 2861 | err = sock_cmsg_send(sk, msg, &sockc); |
| 2862 | if (unlikely(err)) |
| 2863 | goto out_unlock; |
| 2864 | } |
| 2865 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2866 | if (sock->type == SOCK_RAW) |
| 2867 | reserve = dev->hard_header_len; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2868 | if (po->has_vnet_hdr) { |
Willem de Bruijn | 16cc140 | 2016-02-03 18:02:14 -0500 | [diff] [blame] | 2869 | err = packet_snd_vnet_parse(msg, &len, &vnet_hdr); |
| 2870 | if (err) |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2871 | goto out_unlock; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2872 | } |
| 2873 | |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 2874 | if (unlikely(sock_flag(sk, SOCK_NOFCS))) { |
| 2875 | if (!netif_supports_nofcs(dev)) { |
| 2876 | err = -EPROTONOSUPPORT; |
| 2877 | goto out_unlock; |
| 2878 | } |
| 2879 | extra_len = 4; /* We're doing our own CRC */ |
| 2880 | } |
| 2881 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2882 | err = -EMSGSIZE; |
Willem de Bruijn | 16cc140 | 2016-02-03 18:02:14 -0500 | [diff] [blame] | 2883 | if (!vnet_hdr.gso_type && |
| 2884 | (len > dev->mtu + reserve + VLAN_HLEN + extra_len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2885 | goto out_unlock; |
| 2886 | |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2887 | err = -ENOBUFS; |
Herbert Xu | ae64194 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 2888 | hlen = LL_RESERVED_SPACE(dev); |
| 2889 | tlen = dev->needed_tailroom; |
Willem de Bruijn | 8284954 | 2017-02-07 15:57:21 -0500 | [diff] [blame] | 2890 | linear = __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len); |
| 2891 | linear = max(linear, min_t(int, len, dev->hard_header_len)); |
| 2892 | skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, linear, |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2893 | msg->msg_flags & MSG_DONTWAIT, &err); |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2894 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2895 | goto out_unlock; |
| 2896 | |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2897 | skb_set_network_header(skb, reserve); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2898 | |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 2899 | err = -EINVAL; |
Willem de Bruijn | 9c70776 | 2014-11-19 13:10:16 -0500 | [diff] [blame] | 2900 | if (sock->type == SOCK_DGRAM) { |
| 2901 | offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len); |
Christoph Jaeger | 46d2cfb | 2015-01-11 13:01:16 -0500 | [diff] [blame] | 2902 | if (unlikely(offset < 0)) |
Willem de Bruijn | 9c70776 | 2014-11-19 13:10:16 -0500 | [diff] [blame] | 2903 | goto out_free; |
Willem de Bruijn | 9c70776 | 2014-11-19 13:10:16 -0500 | [diff] [blame] | 2904 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2905 | |
| 2906 | /* Returns -EFAULT on error */ |
Al Viro | c0371da | 2014-11-24 10:42:55 -0500 | [diff] [blame] | 2907 | err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2908 | if (err) |
| 2909 | goto out_free; |
Daniel Borkmann | bf84a01 | 2013-04-14 08:08:13 +0000 | [diff] [blame] | 2910 | |
Willem de Bruijn | 9ed988c | 2016-03-09 21:58:34 -0500 | [diff] [blame] | 2911 | if (sock->type == SOCK_RAW && |
| 2912 | !dev_validate_header(dev, skb->data, len)) { |
| 2913 | err = -EINVAL; |
| 2914 | goto out_free; |
| 2915 | } |
| 2916 | |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 2917 | sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2918 | |
Willem de Bruijn | 16cc140 | 2016-02-03 18:02:14 -0500 | [diff] [blame] | 2919 | if (!vnet_hdr.gso_type && (len > dev->mtu + reserve + extra_len) && |
Daniel Borkmann | 3c70c13 | 2015-11-11 23:25:42 +0100 | [diff] [blame] | 2920 | !packet_extra_vlan_len_allowed(dev, skb)) { |
| 2921 | err = -EMSGSIZE; |
| 2922 | goto out_free; |
Ben Greear | 57f89bf | 2011-02-11 09:35:18 +0000 | [diff] [blame] | 2923 | } |
| 2924 | |
David S. Miller | 09effa6 | 2013-08-07 17:11:00 -0700 | [diff] [blame] | 2925 | skb->protocol = proto; |
| 2926 | skb->dev = dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2927 | skb->priority = sk->sk_priority; |
Edward Jee | c7d39e3 | 2015-10-08 14:56:49 -0700 | [diff] [blame] | 2928 | skb->mark = sockc.mark; |
Daniel Borkmann | 0fd5d57 | 2014-02-16 15:55:22 +0100 | [diff] [blame] | 2929 | |
| 2930 | packet_pick_tx_queue(dev, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2931 | |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2932 | if (po->has_vnet_hdr) { |
Willem de Bruijn | 16cc140 | 2016-02-03 18:02:14 -0500 | [diff] [blame] | 2933 | err = packet_snd_vnet_gso(skb, &vnet_hdr); |
| 2934 | if (err) |
| 2935 | goto out_free; |
| 2936 | len += sizeof(vnet_hdr); |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2937 | } |
| 2938 | |
Daniel Borkmann | 8fd6c80 | 2015-11-11 23:25:41 +0100 | [diff] [blame] | 2939 | skb_probe_transport_header(skb, reserve); |
| 2940 | |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 2941 | if (unlikely(extra_len == 4)) |
| 2942 | skb->no_fcs = 1; |
| 2943 | |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 2944 | err = po->xmit(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2945 | if (err > 0 && (err = net_xmit_errno(err)) != 0) |
| 2946 | goto out_unlock; |
| 2947 | |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2948 | dev_put(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2949 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2950 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2951 | |
| 2952 | out_free: |
| 2953 | kfree_skb(skb); |
| 2954 | out_unlock: |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2955 | if (dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2956 | dev_put(dev); |
| 2957 | out: |
| 2958 | return err; |
| 2959 | } |
| 2960 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 2961 | static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2962 | { |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2963 | struct sock *sk = sock->sk; |
| 2964 | struct packet_sock *po = pkt_sk(sk); |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 2965 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2966 | if (po->tx_ring.pg_vec) |
| 2967 | return tpacket_snd(po, msg); |
| 2968 | else |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2969 | return packet_snd(sock, msg, len); |
| 2970 | } |
| 2971 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2972 | /* |
| 2973 | * Close a PACKET socket. This is fairly simple. We immediately go |
| 2974 | * to 'closed' state and remove our protocol entry in the device list. |
| 2975 | */ |
| 2976 | |
| 2977 | static int packet_release(struct socket *sock) |
| 2978 | { |
| 2979 | struct sock *sk = sock->sk; |
| 2980 | struct packet_sock *po; |
Anoob Soman | 9206efc | 2017-02-15 20:25:39 +0000 | [diff] [blame] | 2981 | struct packet_fanout *f; |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 2982 | struct net *net; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2983 | union tpacket_req_u req_u; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2984 | |
| 2985 | if (!sk) |
| 2986 | return 0; |
| 2987 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2988 | net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2989 | po = pkt_sk(sk); |
| 2990 | |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 2991 | mutex_lock(&net->packet.sklist_lock); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 2992 | sk_del_node_init_rcu(sk); |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 2993 | mutex_unlock(&net->packet.sklist_lock); |
| 2994 | |
| 2995 | preempt_disable(); |
Eric Dumazet | 920de80 | 2008-11-24 00:09:29 -0800 | [diff] [blame] | 2996 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 2997 | preempt_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2998 | |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 2999 | spin_lock(&po->bind_lock); |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 3000 | unregister_prot_hook(sk, false); |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 3001 | packet_cached_dev_reset(po); |
| 3002 | |
Ben Greear | 160ff18 | 2011-06-01 07:18:52 +0000 | [diff] [blame] | 3003 | if (po->prot_hook.dev) { |
| 3004 | dev_put(po->prot_hook.dev); |
| 3005 | po->prot_hook.dev = NULL; |
| 3006 | } |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3007 | spin_unlock(&po->bind_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3008 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3009 | packet_flush_mclist(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3010 | |
Phil Sutter | 9665d5d | 2013-02-01 07:21:41 +0000 | [diff] [blame] | 3011 | if (po->rx_ring.pg_vec) { |
| 3012 | memset(&req_u, 0, sizeof(req_u)); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3013 | packet_set_ring(sk, &req_u, 1, 0); |
Phil Sutter | 9665d5d | 2013-02-01 07:21:41 +0000 | [diff] [blame] | 3014 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3015 | |
Phil Sutter | 9665d5d | 2013-02-01 07:21:41 +0000 | [diff] [blame] | 3016 | if (po->tx_ring.pg_vec) { |
| 3017 | memset(&req_u, 0, sizeof(req_u)); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3018 | packet_set_ring(sk, &req_u, 1, 1); |
Phil Sutter | 9665d5d | 2013-02-01 07:21:41 +0000 | [diff] [blame] | 3019 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3020 | |
Anoob Soman | 9206efc | 2017-02-15 20:25:39 +0000 | [diff] [blame] | 3021 | f = fanout_release(sk); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 3022 | |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3023 | synchronize_net(); |
Anoob Soman | 9206efc | 2017-02-15 20:25:39 +0000 | [diff] [blame] | 3024 | |
| 3025 | if (f) { |
| 3026 | fanout_release_data(f); |
| 3027 | kfree(f); |
| 3028 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3029 | /* |
| 3030 | * Now the socket is dead. No more input will appear. |
| 3031 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3032 | sock_orphan(sk); |
| 3033 | sock->sk = NULL; |
| 3034 | |
| 3035 | /* Purge queues */ |
| 3036 | |
| 3037 | skb_queue_purge(&sk->sk_receive_queue); |
Daniel Borkmann | b013840 | 2014-01-15 16:25:36 +0100 | [diff] [blame] | 3038 | packet_free_pending(po); |
Pavel Emelyanov | 17ab56a | 2007-11-10 21:38:48 -0800 | [diff] [blame] | 3039 | sk_refcnt_debug_release(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3040 | |
| 3041 | sock_put(sk); |
| 3042 | return 0; |
| 3043 | } |
| 3044 | |
| 3045 | /* |
| 3046 | * Attach a packet hook. |
| 3047 | */ |
| 3048 | |
Francesco Ruggeri | 30f7ea1 | 2015-11-05 08:16:14 -0800 | [diff] [blame] | 3049 | static int packet_do_bind(struct sock *sk, const char *name, int ifindex, |
| 3050 | __be16 proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3051 | { |
| 3052 | struct packet_sock *po = pkt_sk(sk); |
Lars Westerhoff | 158cd4a | 2015-07-28 01:32:21 +0300 | [diff] [blame] | 3053 | struct net_device *dev_curr; |
Daniel Borkmann | 902fefb | 2014-01-15 16:25:34 +0100 | [diff] [blame] | 3054 | __be16 proto_curr; |
| 3055 | bool need_rehook; |
Francesco Ruggeri | 30f7ea1 | 2015-11-05 08:16:14 -0800 | [diff] [blame] | 3056 | struct net_device *dev = NULL; |
| 3057 | int ret = 0; |
| 3058 | bool unlisted = false; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 3059 | |
Francesco Ruggeri | 30f7ea1 | 2015-11-05 08:16:14 -0800 | [diff] [blame] | 3060 | if (po->fanout) |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 3061 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3062 | |
| 3063 | lock_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3064 | spin_lock(&po->bind_lock); |
Francesco Ruggeri | 30f7ea1 | 2015-11-05 08:16:14 -0800 | [diff] [blame] | 3065 | rcu_read_lock(); |
| 3066 | |
| 3067 | if (name) { |
| 3068 | dev = dev_get_by_name_rcu(sock_net(sk), name); |
| 3069 | if (!dev) { |
| 3070 | ret = -ENODEV; |
| 3071 | goto out_unlock; |
| 3072 | } |
| 3073 | } else if (ifindex) { |
| 3074 | dev = dev_get_by_index_rcu(sock_net(sk), ifindex); |
| 3075 | if (!dev) { |
| 3076 | ret = -ENODEV; |
| 3077 | goto out_unlock; |
| 3078 | } |
| 3079 | } |
| 3080 | |
| 3081 | if (dev) |
| 3082 | dev_hold(dev); |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 3083 | |
Daniel Borkmann | 902fefb | 2014-01-15 16:25:34 +0100 | [diff] [blame] | 3084 | proto_curr = po->prot_hook.type; |
| 3085 | dev_curr = po->prot_hook.dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3086 | |
Daniel Borkmann | 902fefb | 2014-01-15 16:25:34 +0100 | [diff] [blame] | 3087 | need_rehook = proto_curr != proto || dev_curr != dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3088 | |
Daniel Borkmann | 902fefb | 2014-01-15 16:25:34 +0100 | [diff] [blame] | 3089 | if (need_rehook) { |
Francesco Ruggeri | 30f7ea1 | 2015-11-05 08:16:14 -0800 | [diff] [blame] | 3090 | if (po->running) { |
| 3091 | rcu_read_unlock(); |
| 3092 | __unregister_prot_hook(sk, true); |
| 3093 | rcu_read_lock(); |
| 3094 | dev_curr = po->prot_hook.dev; |
| 3095 | if (dev) |
| 3096 | unlisted = !dev_get_by_index_rcu(sock_net(sk), |
| 3097 | dev->ifindex); |
| 3098 | } |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 3099 | |
Daniel Borkmann | 902fefb | 2014-01-15 16:25:34 +0100 | [diff] [blame] | 3100 | po->num = proto; |
| 3101 | po->prot_hook.type = proto; |
Daniel Borkmann | 902fefb | 2014-01-15 16:25:34 +0100 | [diff] [blame] | 3102 | |
Francesco Ruggeri | 30f7ea1 | 2015-11-05 08:16:14 -0800 | [diff] [blame] | 3103 | if (unlikely(unlisted)) { |
| 3104 | dev_put(dev); |
| 3105 | po->prot_hook.dev = NULL; |
| 3106 | po->ifindex = -1; |
| 3107 | packet_cached_dev_reset(po); |
| 3108 | } else { |
| 3109 | po->prot_hook.dev = dev; |
| 3110 | po->ifindex = dev ? dev->ifindex : 0; |
| 3111 | packet_cached_dev_assign(po, dev); |
| 3112 | } |
Daniel Borkmann | 902fefb | 2014-01-15 16:25:34 +0100 | [diff] [blame] | 3113 | } |
Lars Westerhoff | 158cd4a | 2015-07-28 01:32:21 +0300 | [diff] [blame] | 3114 | if (dev_curr) |
| 3115 | dev_put(dev_curr); |
Daniel Borkmann | 902fefb | 2014-01-15 16:25:34 +0100 | [diff] [blame] | 3116 | |
| 3117 | if (proto == 0 || !need_rehook) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3118 | goto out_unlock; |
| 3119 | |
Francesco Ruggeri | 30f7ea1 | 2015-11-05 08:16:14 -0800 | [diff] [blame] | 3120 | if (!unlisted && (!dev || (dev->flags & IFF_UP))) { |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 3121 | register_prot_hook(sk); |
Urs Thuermann | be85d4a | 2007-11-12 21:05:20 -0800 | [diff] [blame] | 3122 | } else { |
| 3123 | sk->sk_err = ENETDOWN; |
| 3124 | if (!sock_flag(sk, SOCK_DEAD)) |
| 3125 | sk->sk_error_report(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3126 | } |
| 3127 | |
| 3128 | out_unlock: |
Francesco Ruggeri | 30f7ea1 | 2015-11-05 08:16:14 -0800 | [diff] [blame] | 3129 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3130 | spin_unlock(&po->bind_lock); |
| 3131 | release_sock(sk); |
Francesco Ruggeri | 30f7ea1 | 2015-11-05 08:16:14 -0800 | [diff] [blame] | 3132 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3133 | } |
| 3134 | |
| 3135 | /* |
| 3136 | * Bind a packet socket to a device |
| 3137 | */ |
| 3138 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3139 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
| 3140 | int addr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3141 | { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3142 | struct sock *sk = sock->sk; |
Alexander Potapenko | 62fe052 | 2017-03-01 12:57:20 +0100 | [diff] [blame] | 3143 | char name[sizeof(uaddr->sa_data) + 1]; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3144 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3145 | /* |
| 3146 | * Check legality |
| 3147 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3148 | |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 3149 | if (addr_len != sizeof(struct sockaddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3150 | return -EINVAL; |
Alexander Potapenko | 62fe052 | 2017-03-01 12:57:20 +0100 | [diff] [blame] | 3151 | /* uaddr->sa_data comes from the userspace, it's not guaranteed to be |
| 3152 | * zero-terminated. |
| 3153 | */ |
| 3154 | memcpy(name, uaddr->sa_data, sizeof(uaddr->sa_data)); |
| 3155 | name[sizeof(uaddr->sa_data)] = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3156 | |
Francesco Ruggeri | 30f7ea1 | 2015-11-05 08:16:14 -0800 | [diff] [blame] | 3157 | return packet_do_bind(sk, name, 0, pkt_sk(sk)->num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3158 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3159 | |
| 3160 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
| 3161 | { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3162 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
| 3163 | struct sock *sk = sock->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3164 | |
| 3165 | /* |
| 3166 | * Check legality |
| 3167 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3168 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3169 | if (addr_len < sizeof(struct sockaddr_ll)) |
| 3170 | return -EINVAL; |
| 3171 | if (sll->sll_family != AF_PACKET) |
| 3172 | return -EINVAL; |
| 3173 | |
Francesco Ruggeri | 30f7ea1 | 2015-11-05 08:16:14 -0800 | [diff] [blame] | 3174 | return packet_do_bind(sk, NULL, sll->sll_ifindex, |
| 3175 | sll->sll_protocol ? : pkt_sk(sk)->num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3176 | } |
| 3177 | |
| 3178 | static struct proto packet_proto = { |
| 3179 | .name = "PACKET", |
| 3180 | .owner = THIS_MODULE, |
| 3181 | .obj_size = sizeof(struct packet_sock), |
| 3182 | }; |
| 3183 | |
| 3184 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3185 | * Create a packet of type SOCK_PACKET. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3186 | */ |
| 3187 | |
Eric Paris | 3f378b6 | 2009-11-05 22:18:14 -0800 | [diff] [blame] | 3188 | static int packet_create(struct net *net, struct socket *sock, int protocol, |
| 3189 | int kern) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3190 | { |
| 3191 | struct sock *sk; |
| 3192 | struct packet_sock *po; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 3193 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3194 | int err; |
| 3195 | |
Eric W. Biederman | df008c9 | 2012-11-16 03:03:07 +0000 | [diff] [blame] | 3196 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3197 | return -EPERM; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 3198 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
| 3199 | sock->type != SOCK_PACKET) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3200 | return -ESOCKTNOSUPPORT; |
| 3201 | |
| 3202 | sock->state = SS_UNCONNECTED; |
| 3203 | |
| 3204 | err = -ENOBUFS; |
Eric W. Biederman | 11aa9c2 | 2015-05-08 21:09:13 -0500 | [diff] [blame] | 3205 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto, kern); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3206 | if (sk == NULL) |
| 3207 | goto out; |
| 3208 | |
| 3209 | sock->ops = &packet_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3210 | if (sock->type == SOCK_PACKET) |
| 3211 | sock->ops = &packet_ops_spkt; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 3212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3213 | sock_init_data(sock, sk); |
| 3214 | |
| 3215 | po = pkt_sk(sk); |
| 3216 | sk->sk_family = PF_PACKET; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 3217 | po->num = proto; |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 3218 | po->xmit = dev_queue_xmit; |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 3219 | |
Daniel Borkmann | b013840 | 2014-01-15 16:25:36 +0100 | [diff] [blame] | 3220 | err = packet_alloc_pending(po); |
| 3221 | if (err) |
| 3222 | goto out2; |
| 3223 | |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 3224 | packet_cached_dev_reset(po); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3225 | |
| 3226 | sk->sk_destruct = packet_sock_destruct; |
Pavel Emelyanov | 17ab56a | 2007-11-10 21:38:48 -0800 | [diff] [blame] | 3227 | sk_refcnt_debug_inc(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3228 | |
| 3229 | /* |
| 3230 | * Attach a protocol block |
| 3231 | */ |
| 3232 | |
| 3233 | spin_lock_init(&po->bind_lock); |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 3234 | mutex_init(&po->pg_vec_lock); |
Willem de Bruijn | 0648ab7 | 2015-05-12 11:56:46 -0400 | [diff] [blame] | 3235 | po->rollover = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3236 | po->prot_hook.func = packet_rcv; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 3237 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3238 | if (sock->type == SOCK_PACKET) |
| 3239 | po->prot_hook.func = packet_rcv_spkt; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 3240 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3241 | po->prot_hook.af_packet_priv = sk; |
| 3242 | |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 3243 | if (proto) { |
| 3244 | po->prot_hook.type = proto; |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 3245 | register_prot_hook(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3246 | } |
| 3247 | |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 3248 | mutex_lock(&net->packet.sklist_lock); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3249 | sk_add_node_rcu(sk, &net->packet.sklist); |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 3250 | mutex_unlock(&net->packet.sklist_lock); |
| 3251 | |
| 3252 | preempt_disable(); |
Eric Dumazet | 3680453 | 2008-11-19 14:25:35 -0800 | [diff] [blame] | 3253 | sock_prot_inuse_add(net, &packet_proto, 1); |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 3254 | preempt_enable(); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3255 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3256 | return 0; |
Daniel Borkmann | b013840 | 2014-01-15 16:25:36 +0100 | [diff] [blame] | 3257 | out2: |
| 3258 | sk_free(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3259 | out: |
| 3260 | return err; |
| 3261 | } |
| 3262 | |
| 3263 | /* |
| 3264 | * Pull a packet from our receive queue and hand it to the user. |
| 3265 | * If necessary we block. |
| 3266 | */ |
| 3267 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 3268 | static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, |
| 3269 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3270 | { |
| 3271 | struct sock *sk = sock->sk; |
| 3272 | struct sk_buff *skb; |
| 3273 | int copied, err; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3274 | int vnet_hdr_len = 0; |
Eyal Birger | 2472d76 | 2015-03-01 14:58:28 +0200 | [diff] [blame] | 3275 | unsigned int origlen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3276 | |
| 3277 | err = -EINVAL; |
Richard Cochran | ed85b56 | 2010-04-07 22:41:28 +0000 | [diff] [blame] | 3278 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3279 | goto out; |
| 3280 | |
| 3281 | #if 0 |
| 3282 | /* What error should we return now? EUNATTACH? */ |
| 3283 | if (pkt_sk(sk)->ifindex < 0) |
| 3284 | return -ENODEV; |
| 3285 | #endif |
| 3286 | |
Richard Cochran | ed85b56 | 2010-04-07 22:41:28 +0000 | [diff] [blame] | 3287 | if (flags & MSG_ERRQUEUE) { |
Richard Cochran | cb820f8 | 2013-07-19 19:40:09 +0200 | [diff] [blame] | 3288 | err = sock_recv_errqueue(sk, msg, len, |
| 3289 | SOL_PACKET, PACKET_TX_TIMESTAMP); |
Richard Cochran | ed85b56 | 2010-04-07 22:41:28 +0000 | [diff] [blame] | 3290 | goto out; |
| 3291 | } |
| 3292 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3293 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3294 | * Call the generic datagram receiver. This handles all sorts |
| 3295 | * of horrible races and re-entrancy so we can forget about it |
| 3296 | * in the protocol layers. |
| 3297 | * |
| 3298 | * Now it will return ENETDOWN, if device have just gone down, |
| 3299 | * but then it will block. |
| 3300 | */ |
| 3301 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3302 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3303 | |
| 3304 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3305 | * An error occurred so return it. Because skb_recv_datagram() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3306 | * handles the blocking we don't see and worry about blocking |
| 3307 | * retries. |
| 3308 | */ |
| 3309 | |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 3310 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3311 | goto out; |
| 3312 | |
Willem de Bruijn | 2ccdbaa | 2015-05-12 11:56:48 -0400 | [diff] [blame] | 3313 | if (pkt_sk(sk)->pressure) |
| 3314 | packet_rcv_has_room(pkt_sk(sk), NULL); |
| 3315 | |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3316 | if (pkt_sk(sk)->has_vnet_hdr) { |
Willem de Bruijn | 16cc140 | 2016-02-03 18:02:14 -0500 | [diff] [blame] | 3317 | err = packet_rcv_vnet(msg, skb, &len); |
| 3318 | if (err) |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3319 | goto out_free; |
Willem de Bruijn | 16cc140 | 2016-02-03 18:02:14 -0500 | [diff] [blame] | 3320 | vnet_hdr_len = sizeof(struct virtio_net_hdr); |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3321 | } |
| 3322 | |
Hannes Frederic Sowa | f3d3342 | 2013-11-21 03:14:22 +0100 | [diff] [blame] | 3323 | /* You lose any data beyond the buffer you gave. If it worries |
| 3324 | * a user program they can ask the device for its MTU |
| 3325 | * anyway. |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 3326 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3327 | copied = skb->len; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3328 | if (copied > len) { |
| 3329 | copied = len; |
| 3330 | msg->msg_flags |= MSG_TRUNC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3331 | } |
| 3332 | |
David S. Miller | 51f3d02 | 2014-11-05 16:46:40 -0500 | [diff] [blame] | 3333 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3334 | if (err) |
| 3335 | goto out_free; |
| 3336 | |
Eyal Birger | 2472d76 | 2015-03-01 14:58:28 +0200 | [diff] [blame] | 3337 | if (sock->type != SOCK_PACKET) { |
| 3338 | struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll; |
| 3339 | |
| 3340 | /* Original length was stored in sockaddr_ll fields */ |
| 3341 | origlen = PACKET_SKB_CB(skb)->sa.origlen; |
| 3342 | sll->sll_family = AF_PACKET; |
| 3343 | sll->sll_protocol = skb->protocol; |
| 3344 | } |
| 3345 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 3346 | sock_recv_ts_and_drops(msg, sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3347 | |
Hannes Frederic Sowa | f3d3342 | 2013-11-21 03:14:22 +0100 | [diff] [blame] | 3348 | if (msg->msg_name) { |
| 3349 | /* If the address length field is there to be filled |
| 3350 | * in, we fill it in now. |
| 3351 | */ |
| 3352 | if (sock->type == SOCK_PACKET) { |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 3353 | __sockaddr_check_size(sizeof(struct sockaddr_pkt)); |
Hannes Frederic Sowa | f3d3342 | 2013-11-21 03:14:22 +0100 | [diff] [blame] | 3354 | msg->msg_namelen = sizeof(struct sockaddr_pkt); |
| 3355 | } else { |
| 3356 | struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll; |
Eyal Birger | 2472d76 | 2015-03-01 14:58:28 +0200 | [diff] [blame] | 3357 | |
Hannes Frederic Sowa | f3d3342 | 2013-11-21 03:14:22 +0100 | [diff] [blame] | 3358 | msg->msg_namelen = sll->sll_halen + |
| 3359 | offsetof(struct sockaddr_ll, sll_addr); |
| 3360 | } |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 3361 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
| 3362 | msg->msg_namelen); |
Hannes Frederic Sowa | f3d3342 | 2013-11-21 03:14:22 +0100 | [diff] [blame] | 3363 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3364 | |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3365 | if (pkt_sk(sk)->auxdata) { |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 3366 | struct tpacket_auxdata aux; |
| 3367 | |
| 3368 | aux.tp_status = TP_STATUS_USER; |
| 3369 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
| 3370 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; |
Alexander Drozdov | 682f048 | 2015-03-23 09:11:13 +0300 | [diff] [blame] | 3371 | else if (skb->pkt_type != PACKET_OUTGOING && |
| 3372 | (skb->ip_summed == CHECKSUM_COMPLETE || |
| 3373 | skb_csum_unnecessary(skb))) |
| 3374 | aux.tp_status |= TP_STATUS_CSUM_VALID; |
| 3375 | |
Eyal Birger | 2472d76 | 2015-03-01 14:58:28 +0200 | [diff] [blame] | 3376 | aux.tp_len = origlen; |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 3377 | aux.tp_snaplen = skb->len; |
| 3378 | aux.tp_mac = 0; |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 3379 | aux.tp_net = skb_network_offset(skb); |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 3380 | if (skb_vlan_tag_present(skb)) { |
| 3381 | aux.tp_vlan_tci = skb_vlan_tag_get(skb); |
Atzm Watanabe | a0cdfcf | 2013-12-17 22:53:40 +0900 | [diff] [blame] | 3382 | aux.tp_vlan_tpid = ntohs(skb->vlan_proto); |
| 3383 | aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID; |
Ben Greear | a3bcc23 | 2011-06-01 06:49:10 +0000 | [diff] [blame] | 3384 | } else { |
| 3385 | aux.tp_vlan_tci = 0; |
Atzm Watanabe | a0cdfcf | 2013-12-17 22:53:40 +0900 | [diff] [blame] | 3386 | aux.tp_vlan_tpid = 0; |
Ben Greear | a3bcc23 | 2011-06-01 06:49:10 +0000 | [diff] [blame] | 3387 | } |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 3388 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3389 | } |
| 3390 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3391 | /* |
| 3392 | * Free or return the buffer as appropriate. Again this |
| 3393 | * hides all the races and re-entrancy issues from us. |
| 3394 | */ |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3395 | err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3396 | |
| 3397 | out_free: |
| 3398 | skb_free_datagram(sk, skb); |
| 3399 | out: |
| 3400 | return err; |
| 3401 | } |
| 3402 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3403 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
| 3404 | int *uaddr_len, int peer) |
| 3405 | { |
| 3406 | struct net_device *dev; |
| 3407 | struct sock *sk = sock->sk; |
| 3408 | |
| 3409 | if (peer) |
| 3410 | return -EOPNOTSUPP; |
| 3411 | |
| 3412 | uaddr->sa_family = AF_PACKET; |
Daniel Borkmann | 2dc85bf | 2013-06-12 16:02:27 +0200 | [diff] [blame] | 3413 | memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data)); |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 3414 | rcu_read_lock(); |
| 3415 | dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); |
| 3416 | if (dev) |
Daniel Borkmann | 2dc85bf | 2013-06-12 16:02:27 +0200 | [diff] [blame] | 3417 | strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data)); |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 3418 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3419 | *uaddr_len = sizeof(*uaddr); |
| 3420 | |
| 3421 | return 0; |
| 3422 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3423 | |
| 3424 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, |
| 3425 | int *uaddr_len, int peer) |
| 3426 | { |
| 3427 | struct net_device *dev; |
| 3428 | struct sock *sk = sock->sk; |
| 3429 | struct packet_sock *po = pkt_sk(sk); |
Cyrill Gorcunov | 13cfa97 | 2009-11-08 05:51:19 +0000 | [diff] [blame] | 3430 | DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3431 | |
| 3432 | if (peer) |
| 3433 | return -EOPNOTSUPP; |
| 3434 | |
| 3435 | sll->sll_family = AF_PACKET; |
| 3436 | sll->sll_ifindex = po->ifindex; |
| 3437 | sll->sll_protocol = po->num; |
Vasiliy Kulikov | 6728664 | 2010-11-10 12:09:10 -0800 | [diff] [blame] | 3438 | sll->sll_pkttype = 0; |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 3439 | rcu_read_lock(); |
| 3440 | dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3441 | if (dev) { |
| 3442 | sll->sll_hatype = dev->type; |
| 3443 | sll->sll_halen = dev->addr_len; |
| 3444 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3445 | } else { |
| 3446 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ |
| 3447 | sll->sll_halen = 0; |
| 3448 | } |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 3449 | rcu_read_unlock(); |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 3450 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3451 | |
| 3452 | return 0; |
| 3453 | } |
| 3454 | |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 3455 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
| 3456 | int what) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3457 | { |
| 3458 | switch (i->type) { |
| 3459 | case PACKET_MR_MULTICAST: |
Jiri Pirko | 1162563 | 2010-03-02 20:40:01 +0000 | [diff] [blame] | 3460 | if (i->alen != dev->addr_len) |
| 3461 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3462 | if (what > 0) |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 3463 | return dev_mc_add(dev, i->addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3464 | else |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 3465 | return dev_mc_del(dev, i->addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3466 | break; |
| 3467 | case PACKET_MR_PROMISC: |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 3468 | return dev_set_promiscuity(dev, what); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3469 | case PACKET_MR_ALLMULTI: |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 3470 | return dev_set_allmulti(dev, what); |
Eric W. Biederman | d95ed92 | 2009-05-19 18:27:17 +0000 | [diff] [blame] | 3471 | case PACKET_MR_UNICAST: |
Jiri Pirko | 1162563 | 2010-03-02 20:40:01 +0000 | [diff] [blame] | 3472 | if (i->alen != dev->addr_len) |
| 3473 | return -EINVAL; |
Eric W. Biederman | d95ed92 | 2009-05-19 18:27:17 +0000 | [diff] [blame] | 3474 | if (what > 0) |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 3475 | return dev_uc_add(dev, i->addr); |
Eric W. Biederman | d95ed92 | 2009-05-19 18:27:17 +0000 | [diff] [blame] | 3476 | else |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 3477 | return dev_uc_del(dev, i->addr); |
Eric W. Biederman | d95ed92 | 2009-05-19 18:27:17 +0000 | [diff] [blame] | 3478 | break; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3479 | default: |
| 3480 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3481 | } |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 3482 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3483 | } |
| 3484 | |
Francesco Ruggeri | 82f1709 | 2015-03-09 11:51:04 -0700 | [diff] [blame] | 3485 | static void packet_dev_mclist_delete(struct net_device *dev, |
| 3486 | struct packet_mclist **mlp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3487 | { |
Francesco Ruggeri | 82f1709 | 2015-03-09 11:51:04 -0700 | [diff] [blame] | 3488 | struct packet_mclist *ml; |
| 3489 | |
| 3490 | while ((ml = *mlp) != NULL) { |
| 3491 | if (ml->ifindex == dev->ifindex) { |
| 3492 | packet_dev_mc(dev, ml, -1); |
| 3493 | *mlp = ml->next; |
| 3494 | kfree(ml); |
| 3495 | } else |
| 3496 | mlp = &ml->next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3497 | } |
| 3498 | } |
| 3499 | |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 3500 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3501 | { |
| 3502 | struct packet_sock *po = pkt_sk(sk); |
| 3503 | struct packet_mclist *ml, *i; |
| 3504 | struct net_device *dev; |
| 3505 | int err; |
| 3506 | |
| 3507 | rtnl_lock(); |
| 3508 | |
| 3509 | err = -ENODEV; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 3510 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3511 | if (!dev) |
| 3512 | goto done; |
| 3513 | |
| 3514 | err = -EINVAL; |
Jiri Pirko | 1162563 | 2010-03-02 20:40:01 +0000 | [diff] [blame] | 3515 | if (mreq->mr_alen > dev->addr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3516 | goto done; |
| 3517 | |
| 3518 | err = -ENOBUFS; |
Kris Katterjohn | 8b3a700 | 2006-01-11 15:56:43 -0800 | [diff] [blame] | 3519 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3520 | if (i == NULL) |
| 3521 | goto done; |
| 3522 | |
| 3523 | err = 0; |
| 3524 | for (ml = po->mclist; ml; ml = ml->next) { |
| 3525 | if (ml->ifindex == mreq->mr_ifindex && |
| 3526 | ml->type == mreq->mr_type && |
| 3527 | ml->alen == mreq->mr_alen && |
| 3528 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { |
| 3529 | ml->count++; |
| 3530 | /* Free the new element ... */ |
| 3531 | kfree(i); |
| 3532 | goto done; |
| 3533 | } |
| 3534 | } |
| 3535 | |
| 3536 | i->type = mreq->mr_type; |
| 3537 | i->ifindex = mreq->mr_ifindex; |
| 3538 | i->alen = mreq->mr_alen; |
| 3539 | memcpy(i->addr, mreq->mr_address, i->alen); |
Mathias Krause | 309cf37 | 2016-04-10 12:52:28 +0200 | [diff] [blame] | 3540 | memset(i->addr + i->alen, 0, sizeof(i->addr) - i->alen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3541 | i->count = 1; |
| 3542 | i->next = po->mclist; |
| 3543 | po->mclist = i; |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 3544 | err = packet_dev_mc(dev, i, 1); |
| 3545 | if (err) { |
| 3546 | po->mclist = i->next; |
| 3547 | kfree(i); |
| 3548 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3549 | |
| 3550 | done: |
| 3551 | rtnl_unlock(); |
| 3552 | return err; |
| 3553 | } |
| 3554 | |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 3555 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3556 | { |
| 3557 | struct packet_mclist *ml, **mlp; |
| 3558 | |
| 3559 | rtnl_lock(); |
| 3560 | |
| 3561 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { |
| 3562 | if (ml->ifindex == mreq->mr_ifindex && |
| 3563 | ml->type == mreq->mr_type && |
| 3564 | ml->alen == mreq->mr_alen && |
| 3565 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { |
| 3566 | if (--ml->count == 0) { |
| 3567 | struct net_device *dev; |
| 3568 | *mlp = ml->next; |
Eric Dumazet | ad959e7 | 2009-10-16 06:38:46 +0000 | [diff] [blame] | 3569 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
| 3570 | if (dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3571 | packet_dev_mc(dev, ml, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3572 | kfree(ml); |
| 3573 | } |
Francesco Ruggeri | 82f1709 | 2015-03-09 11:51:04 -0700 | [diff] [blame] | 3574 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3575 | } |
| 3576 | } |
| 3577 | rtnl_unlock(); |
Francesco Ruggeri | 82f1709 | 2015-03-09 11:51:04 -0700 | [diff] [blame] | 3578 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3579 | } |
| 3580 | |
| 3581 | static void packet_flush_mclist(struct sock *sk) |
| 3582 | { |
| 3583 | struct packet_sock *po = pkt_sk(sk); |
| 3584 | struct packet_mclist *ml; |
| 3585 | |
| 3586 | if (!po->mclist) |
| 3587 | return; |
| 3588 | |
| 3589 | rtnl_lock(); |
| 3590 | while ((ml = po->mclist) != NULL) { |
| 3591 | struct net_device *dev; |
| 3592 | |
| 3593 | po->mclist = ml->next; |
Eric Dumazet | ad959e7 | 2009-10-16 06:38:46 +0000 | [diff] [blame] | 3594 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
| 3595 | if (dev != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3596 | packet_dev_mc(dev, ml, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3597 | kfree(ml); |
| 3598 | } |
| 3599 | rtnl_unlock(); |
| 3600 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3601 | |
| 3602 | static int |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 3603 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3604 | { |
| 3605 | struct sock *sk = sock->sk; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3606 | struct packet_sock *po = pkt_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3607 | int ret; |
| 3608 | |
| 3609 | if (level != SOL_PACKET) |
| 3610 | return -ENOPROTOOPT; |
| 3611 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3612 | switch (optname) { |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3613 | case PACKET_ADD_MEMBERSHIP: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3614 | case PACKET_DROP_MEMBERSHIP: |
| 3615 | { |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 3616 | struct packet_mreq_max mreq; |
| 3617 | int len = optlen; |
| 3618 | memset(&mreq, 0, sizeof(mreq)); |
| 3619 | if (len < sizeof(struct packet_mreq)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3620 | return -EINVAL; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 3621 | if (len > sizeof(mreq)) |
| 3622 | len = sizeof(mreq); |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3623 | if (copy_from_user(&mreq, optval, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3624 | return -EFAULT; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 3625 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
| 3626 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3627 | if (optname == PACKET_ADD_MEMBERSHIP) |
| 3628 | ret = packet_mc_add(sk, &mreq); |
| 3629 | else |
| 3630 | ret = packet_mc_drop(sk, &mreq); |
| 3631 | return ret; |
| 3632 | } |
David S. Miller | a2efcfa | 2007-05-29 13:12:50 -0700 | [diff] [blame] | 3633 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3634 | case PACKET_RX_RING: |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3635 | case PACKET_TX_RING: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3636 | { |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3637 | union tpacket_req_u req_u; |
| 3638 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3639 | |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3640 | switch (po->tp_version) { |
| 3641 | case TPACKET_V1: |
| 3642 | case TPACKET_V2: |
| 3643 | len = sizeof(req_u.req); |
| 3644 | break; |
| 3645 | case TPACKET_V3: |
| 3646 | default: |
| 3647 | len = sizeof(req_u.req3); |
| 3648 | break; |
| 3649 | } |
| 3650 | if (optlen < len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3651 | return -EINVAL; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3652 | if (copy_from_user(&req_u.req, optval, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3653 | return -EFAULT; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3654 | return packet_set_ring(sk, &req_u, 0, |
| 3655 | optname == PACKET_TX_RING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3656 | } |
| 3657 | case PACKET_COPY_THRESH: |
| 3658 | { |
| 3659 | int val; |
| 3660 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3661 | if (optlen != sizeof(val)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3662 | return -EINVAL; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3663 | if (copy_from_user(&val, optval, sizeof(val))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3664 | return -EFAULT; |
| 3665 | |
| 3666 | pkt_sk(sk)->copy_thresh = val; |
| 3667 | return 0; |
| 3668 | } |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3669 | case PACKET_VERSION: |
| 3670 | { |
| 3671 | int val; |
| 3672 | |
| 3673 | if (optlen != sizeof(val)) |
| 3674 | return -EINVAL; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3675 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3676 | return -EFAULT; |
| 3677 | switch (val) { |
| 3678 | case TPACKET_V1: |
| 3679 | case TPACKET_V2: |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3680 | case TPACKET_V3: |
Philip Pettersson | 84ac726 | 2016-11-30 14:55:36 -0800 | [diff] [blame] | 3681 | break; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3682 | default: |
| 3683 | return -EINVAL; |
| 3684 | } |
Philip Pettersson | 84ac726 | 2016-11-30 14:55:36 -0800 | [diff] [blame] | 3685 | lock_sock(sk); |
| 3686 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) { |
| 3687 | ret = -EBUSY; |
| 3688 | } else { |
| 3689 | po->tp_version = val; |
| 3690 | ret = 0; |
| 3691 | } |
| 3692 | release_sock(sk); |
| 3693 | return ret; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3694 | } |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 3695 | case PACKET_RESERVE: |
| 3696 | { |
| 3697 | unsigned int val; |
| 3698 | |
| 3699 | if (optlen != sizeof(val)) |
| 3700 | return -EINVAL; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3701 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 3702 | return -EBUSY; |
| 3703 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3704 | return -EFAULT; |
| 3705 | po->tp_reserve = val; |
| 3706 | return 0; |
| 3707 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3708 | case PACKET_LOSS: |
| 3709 | { |
| 3710 | unsigned int val; |
| 3711 | |
| 3712 | if (optlen != sizeof(val)) |
| 3713 | return -EINVAL; |
| 3714 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
| 3715 | return -EBUSY; |
| 3716 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3717 | return -EFAULT; |
| 3718 | po->tp_loss = !!val; |
| 3719 | return 0; |
| 3720 | } |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3721 | case PACKET_AUXDATA: |
| 3722 | { |
| 3723 | int val; |
| 3724 | |
| 3725 | if (optlen < sizeof(val)) |
| 3726 | return -EINVAL; |
| 3727 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3728 | return -EFAULT; |
| 3729 | |
| 3730 | po->auxdata = !!val; |
| 3731 | return 0; |
| 3732 | } |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 3733 | case PACKET_ORIGDEV: |
| 3734 | { |
| 3735 | int val; |
| 3736 | |
| 3737 | if (optlen < sizeof(val)) |
| 3738 | return -EINVAL; |
| 3739 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3740 | return -EFAULT; |
| 3741 | |
| 3742 | po->origdev = !!val; |
| 3743 | return 0; |
| 3744 | } |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3745 | case PACKET_VNET_HDR: |
| 3746 | { |
| 3747 | int val; |
| 3748 | |
| 3749 | if (sock->type != SOCK_RAW) |
| 3750 | return -EINVAL; |
| 3751 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
| 3752 | return -EBUSY; |
| 3753 | if (optlen < sizeof(val)) |
| 3754 | return -EINVAL; |
| 3755 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3756 | return -EFAULT; |
| 3757 | |
| 3758 | po->has_vnet_hdr = !!val; |
| 3759 | return 0; |
| 3760 | } |
Scott McMillan | 614f60f | 2010-06-02 05:53:56 -0700 | [diff] [blame] | 3761 | case PACKET_TIMESTAMP: |
| 3762 | { |
| 3763 | int val; |
| 3764 | |
| 3765 | if (optlen != sizeof(val)) |
| 3766 | return -EINVAL; |
| 3767 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3768 | return -EFAULT; |
| 3769 | |
| 3770 | po->tp_tstamp = val; |
| 3771 | return 0; |
| 3772 | } |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 3773 | case PACKET_FANOUT: |
| 3774 | { |
| 3775 | int val; |
| 3776 | |
| 3777 | if (optlen != sizeof(val)) |
| 3778 | return -EINVAL; |
| 3779 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3780 | return -EFAULT; |
| 3781 | |
| 3782 | return fanout_add(sk, val & 0xffff, val >> 16); |
| 3783 | } |
Willem de Bruijn | 47dceb8 | 2015-08-14 22:31:34 -0400 | [diff] [blame] | 3784 | case PACKET_FANOUT_DATA: |
| 3785 | { |
| 3786 | if (!po->fanout) |
| 3787 | return -EINVAL; |
| 3788 | |
| 3789 | return fanout_set_data(po, optval, optlen); |
| 3790 | } |
Paul Chavent | 5920cd3a | 2012-11-06 23:10:47 +0000 | [diff] [blame] | 3791 | case PACKET_TX_HAS_OFF: |
| 3792 | { |
| 3793 | unsigned int val; |
| 3794 | |
| 3795 | if (optlen != sizeof(val)) |
| 3796 | return -EINVAL; |
| 3797 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
| 3798 | return -EBUSY; |
| 3799 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3800 | return -EFAULT; |
| 3801 | po->tp_tx_has_off = !!val; |
| 3802 | return 0; |
| 3803 | } |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 3804 | case PACKET_QDISC_BYPASS: |
| 3805 | { |
| 3806 | int val; |
| 3807 | |
| 3808 | if (optlen != sizeof(val)) |
| 3809 | return -EINVAL; |
| 3810 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3811 | return -EFAULT; |
| 3812 | |
| 3813 | po->xmit = val ? packet_direct_xmit : dev_queue_xmit; |
| 3814 | return 0; |
| 3815 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3816 | default: |
| 3817 | return -ENOPROTOOPT; |
| 3818 | } |
| 3819 | } |
| 3820 | |
| 3821 | static int packet_getsockopt(struct socket *sock, int level, int optname, |
| 3822 | char __user *optval, int __user *optlen) |
| 3823 | { |
| 3824 | int len; |
Eric Dumazet | c06fff6 | 2012-04-19 21:56:11 +0000 | [diff] [blame] | 3825 | int val, lv = sizeof(val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3826 | struct sock *sk = sock->sk; |
| 3827 | struct packet_sock *po = pkt_sk(sk); |
Eric Dumazet | c06fff6 | 2012-04-19 21:56:11 +0000 | [diff] [blame] | 3828 | void *data = &val; |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 3829 | union tpacket_stats_u st; |
Willem de Bruijn | a9b6391 | 2015-05-12 11:56:50 -0400 | [diff] [blame] | 3830 | struct tpacket_rollover_stats rstats; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3831 | |
| 3832 | if (level != SOL_PACKET) |
| 3833 | return -ENOPROTOOPT; |
| 3834 | |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 3835 | if (get_user(len, optlen)) |
| 3836 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3837 | |
| 3838 | if (len < 0) |
| 3839 | return -EINVAL; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3840 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3841 | switch (optname) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3842 | case PACKET_STATISTICS: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3843 | spin_lock_bh(&sk->sk_receive_queue.lock); |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 3844 | memcpy(&st, &po->stats, sizeof(st)); |
| 3845 | memset(&po->stats, 0, sizeof(po->stats)); |
| 3846 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 3847 | |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3848 | if (po->tp_version == TPACKET_V3) { |
Eric Dumazet | c06fff6 | 2012-04-19 21:56:11 +0000 | [diff] [blame] | 3849 | lv = sizeof(struct tpacket_stats_v3); |
Willem de Bruijn | 8bcdeaf | 2013-08-19 16:40:22 -0400 | [diff] [blame] | 3850 | st.stats3.tp_packets += st.stats3.tp_drops; |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 3851 | data = &st.stats3; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3852 | } else { |
Eric Dumazet | c06fff6 | 2012-04-19 21:56:11 +0000 | [diff] [blame] | 3853 | lv = sizeof(struct tpacket_stats); |
Willem de Bruijn | 8bcdeaf | 2013-08-19 16:40:22 -0400 | [diff] [blame] | 3854 | st.stats1.tp_packets += st.stats1.tp_drops; |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 3855 | data = &st.stats1; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3856 | } |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 3857 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3858 | break; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3859 | case PACKET_AUXDATA: |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3860 | val = po->auxdata; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3861 | break; |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 3862 | case PACKET_ORIGDEV: |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 3863 | val = po->origdev; |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 3864 | break; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3865 | case PACKET_VNET_HDR: |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3866 | val = po->has_vnet_hdr; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3867 | break; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3868 | case PACKET_VERSION: |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3869 | val = po->tp_version; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3870 | break; |
| 3871 | case PACKET_HDRLEN: |
| 3872 | if (len > sizeof(int)) |
| 3873 | len = sizeof(int); |
| 3874 | if (copy_from_user(&val, optval, len)) |
| 3875 | return -EFAULT; |
| 3876 | switch (val) { |
| 3877 | case TPACKET_V1: |
| 3878 | val = sizeof(struct tpacket_hdr); |
| 3879 | break; |
| 3880 | case TPACKET_V2: |
| 3881 | val = sizeof(struct tpacket2_hdr); |
| 3882 | break; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3883 | case TPACKET_V3: |
| 3884 | val = sizeof(struct tpacket3_hdr); |
| 3885 | break; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3886 | default: |
| 3887 | return -EINVAL; |
| 3888 | } |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3889 | break; |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 3890 | case PACKET_RESERVE: |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 3891 | val = po->tp_reserve; |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 3892 | break; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3893 | case PACKET_LOSS: |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3894 | val = po->tp_loss; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3895 | break; |
Scott McMillan | 614f60f | 2010-06-02 05:53:56 -0700 | [diff] [blame] | 3896 | case PACKET_TIMESTAMP: |
Scott McMillan | 614f60f | 2010-06-02 05:53:56 -0700 | [diff] [blame] | 3897 | val = po->tp_tstamp; |
Scott McMillan | 614f60f | 2010-06-02 05:53:56 -0700 | [diff] [blame] | 3898 | break; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 3899 | case PACKET_FANOUT: |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 3900 | val = (po->fanout ? |
| 3901 | ((u32)po->fanout->id | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 3902 | ((u32)po->fanout->type << 16) | |
| 3903 | ((u32)po->fanout->flags << 24)) : |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 3904 | 0); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 3905 | break; |
Willem de Bruijn | a9b6391 | 2015-05-12 11:56:50 -0400 | [diff] [blame] | 3906 | case PACKET_ROLLOVER_STATS: |
| 3907 | if (!po->rollover) |
| 3908 | return -EINVAL; |
| 3909 | rstats.tp_all = atomic_long_read(&po->rollover->num); |
| 3910 | rstats.tp_huge = atomic_long_read(&po->rollover->num_huge); |
| 3911 | rstats.tp_failed = atomic_long_read(&po->rollover->num_failed); |
| 3912 | data = &rstats; |
| 3913 | lv = sizeof(rstats); |
| 3914 | break; |
Paul Chavent | 5920cd3a | 2012-11-06 23:10:47 +0000 | [diff] [blame] | 3915 | case PACKET_TX_HAS_OFF: |
| 3916 | val = po->tp_tx_has_off; |
| 3917 | break; |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 3918 | case PACKET_QDISC_BYPASS: |
| 3919 | val = packet_use_direct_xmit(po); |
| 3920 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3921 | default: |
| 3922 | return -ENOPROTOOPT; |
| 3923 | } |
| 3924 | |
Eric Dumazet | c06fff6 | 2012-04-19 21:56:11 +0000 | [diff] [blame] | 3925 | if (len > lv) |
| 3926 | len = lv; |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 3927 | if (put_user(len, optlen)) |
| 3928 | return -EFAULT; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3929 | if (copy_to_user(optval, data, len)) |
| 3930 | return -EFAULT; |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 3931 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3932 | } |
| 3933 | |
| 3934 | |
Willem de Bruijn | 719c44d | 2016-06-07 12:06:34 -0400 | [diff] [blame] | 3935 | #ifdef CONFIG_COMPAT |
| 3936 | static int compat_packet_setsockopt(struct socket *sock, int level, int optname, |
| 3937 | char __user *optval, unsigned int optlen) |
| 3938 | { |
| 3939 | struct packet_sock *po = pkt_sk(sock->sk); |
| 3940 | |
| 3941 | if (level != SOL_PACKET) |
| 3942 | return -ENOPROTOOPT; |
| 3943 | |
| 3944 | if (optname == PACKET_FANOUT_DATA && |
| 3945 | po->fanout && po->fanout->type == PACKET_FANOUT_CBPF) { |
| 3946 | optval = (char __user *)get_compat_bpf_fprog(optval); |
| 3947 | if (!optval) |
| 3948 | return -EFAULT; |
| 3949 | optlen = sizeof(struct sock_fprog); |
| 3950 | } |
| 3951 | |
| 3952 | return packet_setsockopt(sock, level, optname, optval, optlen); |
| 3953 | } |
| 3954 | #endif |
| 3955 | |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 3956 | static int packet_notifier(struct notifier_block *this, |
| 3957 | unsigned long msg, void *ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3958 | { |
| 3959 | struct sock *sk; |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 3960 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 3961 | struct net *net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3962 | |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3963 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 3964 | sk_for_each_rcu(sk, &net->packet.sklist) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3965 | struct packet_sock *po = pkt_sk(sk); |
| 3966 | |
| 3967 | switch (msg) { |
| 3968 | case NETDEV_UNREGISTER: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3969 | if (po->mclist) |
Francesco Ruggeri | 82f1709 | 2015-03-09 11:51:04 -0700 | [diff] [blame] | 3970 | packet_dev_mclist_delete(dev, &po->mclist); |
David S. Miller | a2efcfa | 2007-05-29 13:12:50 -0700 | [diff] [blame] | 3971 | /* fallthrough */ |
| 3972 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3973 | case NETDEV_DOWN: |
| 3974 | if (dev->ifindex == po->ifindex) { |
| 3975 | spin_lock(&po->bind_lock); |
| 3976 | if (po->running) { |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 3977 | __unregister_prot_hook(sk, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3978 | sk->sk_err = ENETDOWN; |
| 3979 | if (!sock_flag(sk, SOCK_DEAD)) |
| 3980 | sk->sk_error_report(sk); |
| 3981 | } |
| 3982 | if (msg == NETDEV_UNREGISTER) { |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 3983 | packet_cached_dev_reset(po); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3984 | po->ifindex = -1; |
Ben Greear | 160ff18 | 2011-06-01 07:18:52 +0000 | [diff] [blame] | 3985 | if (po->prot_hook.dev) |
| 3986 | dev_put(po->prot_hook.dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3987 | po->prot_hook.dev = NULL; |
| 3988 | } |
| 3989 | spin_unlock(&po->bind_lock); |
| 3990 | } |
| 3991 | break; |
| 3992 | case NETDEV_UP: |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3993 | if (dev->ifindex == po->ifindex) { |
| 3994 | spin_lock(&po->bind_lock); |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 3995 | if (po->num) |
| 3996 | register_prot_hook(sk); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3997 | spin_unlock(&po->bind_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3998 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3999 | break; |
| 4000 | } |
| 4001 | } |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 4002 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4003 | return NOTIFY_DONE; |
| 4004 | } |
| 4005 | |
| 4006 | |
| 4007 | static int packet_ioctl(struct socket *sock, unsigned int cmd, |
| 4008 | unsigned long arg) |
| 4009 | { |
| 4010 | struct sock *sk = sock->sk; |
| 4011 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4012 | switch (cmd) { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 4013 | case SIOCOUTQ: |
| 4014 | { |
| 4015 | int amount = sk_wmem_alloc_get(sk); |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 4016 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 4017 | return put_user(amount, (int __user *)arg); |
| 4018 | } |
| 4019 | case SIOCINQ: |
| 4020 | { |
| 4021 | struct sk_buff *skb; |
| 4022 | int amount = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4023 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 4024 | spin_lock_bh(&sk->sk_receive_queue.lock); |
| 4025 | skb = skb_peek(&sk->sk_receive_queue); |
| 4026 | if (skb) |
| 4027 | amount = skb->len; |
| 4028 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 4029 | return put_user(amount, (int __user *)arg); |
| 4030 | } |
| 4031 | case SIOCGSTAMP: |
| 4032 | return sock_get_timestamp(sk, (struct timeval __user *)arg); |
| 4033 | case SIOCGSTAMPNS: |
| 4034 | return sock_get_timestampns(sk, (struct timespec __user *)arg); |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 4035 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4036 | #ifdef CONFIG_INET |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 4037 | case SIOCADDRT: |
| 4038 | case SIOCDELRT: |
| 4039 | case SIOCDARP: |
| 4040 | case SIOCGARP: |
| 4041 | case SIOCSARP: |
| 4042 | case SIOCGIFADDR: |
| 4043 | case SIOCSIFADDR: |
| 4044 | case SIOCGIFBRDADDR: |
| 4045 | case SIOCSIFBRDADDR: |
| 4046 | case SIOCGIFNETMASK: |
| 4047 | case SIOCSIFNETMASK: |
| 4048 | case SIOCGIFDSTADDR: |
| 4049 | case SIOCSIFDSTADDR: |
| 4050 | case SIOCSIFFLAGS: |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 4051 | return inet_dgram_ops.ioctl(sock, cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4052 | #endif |
| 4053 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 4054 | default: |
| 4055 | return -ENOIOCTLCMD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4056 | } |
| 4057 | return 0; |
| 4058 | } |
| 4059 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 4060 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4061 | poll_table *wait) |
| 4062 | { |
| 4063 | struct sock *sk = sock->sk; |
| 4064 | struct packet_sock *po = pkt_sk(sk); |
| 4065 | unsigned int mask = datagram_poll(file, sock, wait); |
| 4066 | |
| 4067 | spin_lock_bh(&sk->sk_receive_queue.lock); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4068 | if (po->rx_ring.pg_vec) { |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 4069 | if (!packet_previous_rx_frame(po, &po->rx_ring, |
| 4070 | TP_STATUS_KERNEL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4071 | mask |= POLLIN | POLLRDNORM; |
| 4072 | } |
Willem de Bruijn | 2ccdbaa | 2015-05-12 11:56:48 -0400 | [diff] [blame] | 4073 | if (po->pressure && __packet_rcv_has_room(po, NULL) == ROOM_NORMAL) |
Willem de Bruijn | 54d7c01 | 2015-05-14 15:25:02 -0400 | [diff] [blame] | 4074 | po->pressure = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4075 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4076 | spin_lock_bh(&sk->sk_write_queue.lock); |
| 4077 | if (po->tx_ring.pg_vec) { |
| 4078 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) |
| 4079 | mask |= POLLOUT | POLLWRNORM; |
| 4080 | } |
| 4081 | spin_unlock_bh(&sk->sk_write_queue.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4082 | return mask; |
| 4083 | } |
| 4084 | |
| 4085 | |
| 4086 | /* Dirty? Well, I still did not learn better way to account |
| 4087 | * for user mmaps. |
| 4088 | */ |
| 4089 | |
| 4090 | static void packet_mm_open(struct vm_area_struct *vma) |
| 4091 | { |
| 4092 | struct file *file = vma->vm_file; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 4093 | struct socket *sock = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4094 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 4095 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4096 | if (sk) |
| 4097 | atomic_inc(&pkt_sk(sk)->mapped); |
| 4098 | } |
| 4099 | |
| 4100 | static void packet_mm_close(struct vm_area_struct *vma) |
| 4101 | { |
| 4102 | struct file *file = vma->vm_file; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 4103 | struct socket *sock = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4104 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 4105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4106 | if (sk) |
| 4107 | atomic_dec(&pkt_sk(sk)->mapped); |
| 4108 | } |
| 4109 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 4110 | static const struct vm_operations_struct packet_mmap_ops = { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 4111 | .open = packet_mm_open, |
| 4112 | .close = packet_mm_close, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4113 | }; |
| 4114 | |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 4115 | static void free_pg_vec(struct pgv *pg_vec, unsigned int order, |
| 4116 | unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4117 | { |
| 4118 | int i; |
| 4119 | |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 4120 | for (i = 0; i < len; i++) { |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 4121 | if (likely(pg_vec[i].buffer)) { |
Changli Gao | c56b4d9 | 2010-12-01 02:52:57 +0000 | [diff] [blame] | 4122 | if (is_vmalloc_addr(pg_vec[i].buffer)) |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 4123 | vfree(pg_vec[i].buffer); |
| 4124 | else |
| 4125 | free_pages((unsigned long)pg_vec[i].buffer, |
| 4126 | order); |
| 4127 | pg_vec[i].buffer = NULL; |
| 4128 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4129 | } |
| 4130 | kfree(pg_vec); |
| 4131 | } |
| 4132 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 4133 | static char *alloc_one_pg_vec_page(unsigned long order) |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 4134 | { |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 4135 | char *buffer; |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 4136 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | |
| 4137 | __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY; |
Eric Dumazet | 719bfea | 2009-04-15 03:39:52 -0700 | [diff] [blame] | 4138 | |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 4139 | buffer = (char *) __get_free_pages(gfp_flags, order); |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 4140 | if (buffer) |
| 4141 | return buffer; |
| 4142 | |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 4143 | /* __get_free_pages failed, fall back to vmalloc */ |
Eric Dumazet | bbce5a5 | 2010-11-20 07:31:54 +0000 | [diff] [blame] | 4144 | buffer = vzalloc((1 << order) * PAGE_SIZE); |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 4145 | if (buffer) |
| 4146 | return buffer; |
| 4147 | |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 4148 | /* vmalloc failed, lets dig into swap here */ |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 4149 | gfp_flags &= ~__GFP_NORETRY; |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 4150 | buffer = (char *) __get_free_pages(gfp_flags, order); |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 4151 | if (buffer) |
| 4152 | return buffer; |
| 4153 | |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 4154 | /* complete and utter failure */ |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 4155 | return NULL; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 4156 | } |
| 4157 | |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 4158 | static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order) |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 4159 | { |
| 4160 | unsigned int block_nr = req->tp_block_nr; |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 4161 | struct pgv *pg_vec; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 4162 | int i; |
| 4163 | |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 4164 | pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL); |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 4165 | if (unlikely(!pg_vec)) |
| 4166 | goto out; |
| 4167 | |
| 4168 | for (i = 0; i < block_nr; i++) { |
Changli Gao | c56b4d9 | 2010-12-01 02:52:57 +0000 | [diff] [blame] | 4169 | pg_vec[i].buffer = alloc_one_pg_vec_page(order); |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 4170 | if (unlikely(!pg_vec[i].buffer)) |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 4171 | goto out_free_pgvec; |
| 4172 | } |
| 4173 | |
| 4174 | out: |
| 4175 | return pg_vec; |
| 4176 | |
| 4177 | out_free_pgvec: |
| 4178 | free_pg_vec(pg_vec, order, block_nr); |
| 4179 | pg_vec = NULL; |
| 4180 | goto out; |
| 4181 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4182 | |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 4183 | static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u, |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4184 | int closing, int tx_ring) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4185 | { |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 4186 | struct pgv *pg_vec = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4187 | struct packet_sock *po = pkt_sk(sk); |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 4188 | int was_running, order = 0; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4189 | struct packet_ring_buffer *rb; |
| 4190 | struct sk_buff_head *rb_queue; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 4191 | __be16 num; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 4192 | int err = -EINVAL; |
| 4193 | /* Added to avoid minimal code churn */ |
| 4194 | struct tpacket_req *req = &req_u->req; |
| 4195 | |
Philip Pettersson | 84ac726 | 2016-11-30 14:55:36 -0800 | [diff] [blame] | 4196 | lock_sock(sk); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 4197 | /* Opening a Tx-ring is NOT supported in TPACKET_V3 */ |
| 4198 | if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) { |
Dave Jones | 6ae81ce | 2016-04-04 15:11:50 -0400 | [diff] [blame] | 4199 | net_warn_ratelimited("Tx-ring is not supported.\n"); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 4200 | goto out; |
| 4201 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4202 | |
| 4203 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
| 4204 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; |
| 4205 | |
| 4206 | err = -EBUSY; |
| 4207 | if (!closing) { |
| 4208 | if (atomic_read(&po->mapped)) |
| 4209 | goto out; |
Daniel Borkmann | b013840 | 2014-01-15 16:25:36 +0100 | [diff] [blame] | 4210 | if (packet_read_pending(rb)) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4211 | goto out; |
| 4212 | } |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 4213 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4214 | if (req->tp_block_nr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4215 | /* Sanity tests and some calculations */ |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4216 | err = -EBUSY; |
| 4217 | if (unlikely(rb->pg_vec)) |
| 4218 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4219 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 4220 | switch (po->tp_version) { |
| 4221 | case TPACKET_V1: |
| 4222 | po->tp_hdrlen = TPACKET_HDRLEN; |
| 4223 | break; |
| 4224 | case TPACKET_V2: |
| 4225 | po->tp_hdrlen = TPACKET2_HDRLEN; |
| 4226 | break; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 4227 | case TPACKET_V3: |
| 4228 | po->tp_hdrlen = TPACKET3_HDRLEN; |
| 4229 | break; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 4230 | } |
| 4231 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4232 | err = -EINVAL; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 4233 | if (unlikely((int)req->tp_block_size <= 0)) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4234 | goto out; |
Tobias Klauser | 90836b6 | 2015-11-17 10:40:21 +0100 | [diff] [blame] | 4235 | if (unlikely(!PAGE_ALIGNED(req->tp_block_size))) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4236 | goto out; |
Eric Dumazet | dc80811 | 2014-08-15 09:16:04 -0700 | [diff] [blame] | 4237 | if (po->tp_version >= TPACKET_V3 && |
| 4238 | (int)(req->tp_block_size - |
| 4239 | BLK_PLUS_PRIV(req_u->req3.tp_sizeof_priv)) <= 0) |
| 4240 | goto out; |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 4241 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4242 | po->tp_reserve)) |
| 4243 | goto out; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 4244 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4245 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4246 | |
Tobias Klauser | 4194b49 | 2015-11-17 10:38:36 +0100 | [diff] [blame] | 4247 | rb->frames_per_block = req->tp_block_size / req->tp_frame_size; |
| 4248 | if (unlikely(rb->frames_per_block == 0)) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4249 | goto out; |
| 4250 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != |
| 4251 | req->tp_frame_nr)) |
| 4252 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4253 | |
| 4254 | err = -ENOMEM; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 4255 | order = get_order(req->tp_block_size); |
| 4256 | pg_vec = alloc_pg_vec(req, order); |
| 4257 | if (unlikely(!pg_vec)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4258 | goto out; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 4259 | switch (po->tp_version) { |
| 4260 | case TPACKET_V3: |
| 4261 | /* Transmit path is not supported. We checked |
| 4262 | * it above but just being paranoid |
| 4263 | */ |
| 4264 | if (!tx_ring) |
Maninder Singh | e8e85cc | 2015-06-22 12:39:16 +0530 | [diff] [blame] | 4265 | init_prb_bdqc(po, rb, pg_vec, req_u); |
Dan Carpenter | d7cf0c3 | 2014-02-18 15:20:51 +0300 | [diff] [blame] | 4266 | break; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 4267 | default: |
| 4268 | break; |
| 4269 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4270 | } |
| 4271 | /* Done */ |
| 4272 | else { |
| 4273 | err = -EINVAL; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 4274 | if (unlikely(req->tp_frame_nr)) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4275 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4276 | } |
| 4277 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4278 | |
| 4279 | /* Detach socket from network */ |
| 4280 | spin_lock(&po->bind_lock); |
| 4281 | was_running = po->running; |
| 4282 | num = po->num; |
| 4283 | if (was_running) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4284 | po->num = 0; |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 4285 | __unregister_prot_hook(sk, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4286 | } |
| 4287 | spin_unlock(&po->bind_lock); |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 4288 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4289 | synchronize_net(); |
| 4290 | |
| 4291 | err = -EBUSY; |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 4292 | mutex_lock(&po->pg_vec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4293 | if (closing || atomic_read(&po->mapped) == 0) { |
| 4294 | err = 0; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4295 | spin_lock_bh(&rb_queue->lock); |
Changli Gao | c053fd9 | 2010-12-10 16:02:20 -0800 | [diff] [blame] | 4296 | swap(rb->pg_vec, pg_vec); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4297 | rb->frame_max = (req->tp_frame_nr - 1); |
| 4298 | rb->head = 0; |
| 4299 | rb->frame_size = req->tp_frame_size; |
| 4300 | spin_unlock_bh(&rb_queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4301 | |
Changli Gao | c053fd9 | 2010-12-10 16:02:20 -0800 | [diff] [blame] | 4302 | swap(rb->pg_vec_order, order); |
| 4303 | swap(rb->pg_vec_len, req->tp_block_nr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4304 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4305 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; |
| 4306 | po->prot_hook.func = (po->rx_ring.pg_vec) ? |
| 4307 | tpacket_rcv : packet_rcv; |
| 4308 | skb_queue_purge(rb_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4309 | if (atomic_read(&po->mapped)) |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 4310 | pr_err("packet_mmap: vma is busy: %d\n", |
| 4311 | atomic_read(&po->mapped)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4312 | } |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 4313 | mutex_unlock(&po->pg_vec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4314 | |
| 4315 | spin_lock(&po->bind_lock); |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 4316 | if (was_running) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4317 | po->num = num; |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 4318 | register_prot_hook(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4319 | } |
| 4320 | spin_unlock(&po->bind_lock); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 4321 | if (closing && (po->tp_version > TPACKET_V2)) { |
| 4322 | /* Because we don't support block-based V3 on tx-ring */ |
| 4323 | if (!tx_ring) |
Tobias Klauser | 73d0fcf | 2015-07-28 14:21:26 +0200 | [diff] [blame] | 4324 | prb_shutdown_retire_blk_timer(po, rb_queue); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 4325 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4326 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4327 | if (pg_vec) |
| 4328 | free_pg_vec(pg_vec, order, req->tp_block_nr); |
| 4329 | out: |
Philip Pettersson | 84ac726 | 2016-11-30 14:55:36 -0800 | [diff] [blame] | 4330 | release_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4331 | return err; |
| 4332 | } |
| 4333 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4334 | static int packet_mmap(struct file *file, struct socket *sock, |
| 4335 | struct vm_area_struct *vma) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4336 | { |
| 4337 | struct sock *sk = sock->sk; |
| 4338 | struct packet_sock *po = pkt_sk(sk); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4339 | unsigned long size, expected_size; |
| 4340 | struct packet_ring_buffer *rb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4341 | unsigned long start; |
| 4342 | int err = -EINVAL; |
| 4343 | int i; |
| 4344 | |
| 4345 | if (vma->vm_pgoff) |
| 4346 | return -EINVAL; |
| 4347 | |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 4348 | mutex_lock(&po->pg_vec_lock); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4349 | |
| 4350 | expected_size = 0; |
| 4351 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
| 4352 | if (rb->pg_vec) { |
| 4353 | expected_size += rb->pg_vec_len |
| 4354 | * rb->pg_vec_pages |
| 4355 | * PAGE_SIZE; |
| 4356 | } |
| 4357 | } |
| 4358 | |
| 4359 | if (expected_size == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4360 | goto out; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4361 | |
| 4362 | size = vma->vm_end - vma->vm_start; |
| 4363 | if (size != expected_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4364 | goto out; |
| 4365 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4366 | start = vma->vm_start; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4367 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
| 4368 | if (rb->pg_vec == NULL) |
| 4369 | continue; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 4370 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4371 | for (i = 0; i < rb->pg_vec_len; i++) { |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 4372 | struct page *page; |
| 4373 | void *kaddr = rb->pg_vec[i].buffer; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4374 | int pg_num; |
| 4375 | |
Changli Gao | c56b4d9 | 2010-12-01 02:52:57 +0000 | [diff] [blame] | 4376 | for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) { |
| 4377 | page = pgv_to_page(kaddr); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4378 | err = vm_insert_page(vma, start, page); |
| 4379 | if (unlikely(err)) |
| 4380 | goto out; |
| 4381 | start += PAGE_SIZE; |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 4382 | kaddr += PAGE_SIZE; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4383 | } |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 4384 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4385 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 4386 | |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 4387 | atomic_inc(&po->mapped); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4388 | vma->vm_ops = &packet_mmap_ops; |
| 4389 | err = 0; |
| 4390 | |
| 4391 | out: |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 4392 | mutex_unlock(&po->pg_vec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4393 | return err; |
| 4394 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4395 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 4396 | static const struct proto_ops packet_ops_spkt = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4397 | .family = PF_PACKET, |
| 4398 | .owner = THIS_MODULE, |
| 4399 | .release = packet_release, |
| 4400 | .bind = packet_bind_spkt, |
| 4401 | .connect = sock_no_connect, |
| 4402 | .socketpair = sock_no_socketpair, |
| 4403 | .accept = sock_no_accept, |
| 4404 | .getname = packet_getname_spkt, |
| 4405 | .poll = datagram_poll, |
| 4406 | .ioctl = packet_ioctl, |
| 4407 | .listen = sock_no_listen, |
| 4408 | .shutdown = sock_no_shutdown, |
| 4409 | .setsockopt = sock_no_setsockopt, |
| 4410 | .getsockopt = sock_no_getsockopt, |
| 4411 | .sendmsg = packet_sendmsg_spkt, |
| 4412 | .recvmsg = packet_recvmsg, |
| 4413 | .mmap = sock_no_mmap, |
| 4414 | .sendpage = sock_no_sendpage, |
| 4415 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4416 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 4417 | static const struct proto_ops packet_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4418 | .family = PF_PACKET, |
| 4419 | .owner = THIS_MODULE, |
| 4420 | .release = packet_release, |
| 4421 | .bind = packet_bind, |
| 4422 | .connect = sock_no_connect, |
| 4423 | .socketpair = sock_no_socketpair, |
| 4424 | .accept = sock_no_accept, |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 4425 | .getname = packet_getname, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4426 | .poll = packet_poll, |
| 4427 | .ioctl = packet_ioctl, |
| 4428 | .listen = sock_no_listen, |
| 4429 | .shutdown = sock_no_shutdown, |
| 4430 | .setsockopt = packet_setsockopt, |
| 4431 | .getsockopt = packet_getsockopt, |
Willem de Bruijn | 719c44d | 2016-06-07 12:06:34 -0400 | [diff] [blame] | 4432 | #ifdef CONFIG_COMPAT |
| 4433 | .compat_setsockopt = compat_packet_setsockopt, |
| 4434 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4435 | .sendmsg = packet_sendmsg, |
| 4436 | .recvmsg = packet_recvmsg, |
| 4437 | .mmap = packet_mmap, |
| 4438 | .sendpage = sock_no_sendpage, |
| 4439 | }; |
| 4440 | |
Stephen Hemminger | ec1b4cf | 2009-10-05 05:58:39 +0000 | [diff] [blame] | 4441 | static const struct net_proto_family packet_family_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4442 | .family = PF_PACKET, |
| 4443 | .create = packet_create, |
| 4444 | .owner = THIS_MODULE, |
| 4445 | }; |
| 4446 | |
| 4447 | static struct notifier_block packet_netdev_notifier = { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 4448 | .notifier_call = packet_notifier, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4449 | }; |
| 4450 | |
| 4451 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4452 | |
| 4453 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 4454 | __acquires(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4455 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 4456 | struct net *net = seq_file_net(seq); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 4457 | |
| 4458 | rcu_read_lock(); |
| 4459 | return seq_hlist_start_head_rcu(&net->packet.sklist, *pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4460 | } |
| 4461 | |
| 4462 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 4463 | { |
Herbert Xu | 1bf4095 | 2007-12-16 14:04:02 -0800 | [diff] [blame] | 4464 | struct net *net = seq_file_net(seq); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 4465 | return seq_hlist_next_rcu(v, &net->packet.sklist, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4466 | } |
| 4467 | |
| 4468 | static void packet_seq_stop(struct seq_file *seq, void *v) |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 4469 | __releases(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4470 | { |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 4471 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4472 | } |
| 4473 | |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 4474 | static int packet_seq_show(struct seq_file *seq, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4475 | { |
| 4476 | if (v == SEQ_START_TOKEN) |
| 4477 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); |
| 4478 | else { |
Li Zefan | b7ceabd | 2010-02-08 23:19:29 +0000 | [diff] [blame] | 4479 | struct sock *s = sk_entry(v); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4480 | const struct packet_sock *po = pkt_sk(s); |
| 4481 | |
| 4482 | seq_printf(seq, |
Dan Rosenberg | 71338aa | 2011-05-23 12:17:35 +0000 | [diff] [blame] | 4483 | "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4484 | s, |
| 4485 | atomic_read(&s->sk_refcnt), |
| 4486 | s->sk_type, |
| 4487 | ntohs(po->num), |
| 4488 | po->ifindex, |
| 4489 | po->running, |
| 4490 | atomic_read(&s->sk_rmem_alloc), |
Eric W. Biederman | a7cb5a4 | 2012-05-24 01:10:10 -0600 | [diff] [blame] | 4491 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)), |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 4492 | sock_i_ino(s)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4493 | } |
| 4494 | |
| 4495 | return 0; |
| 4496 | } |
| 4497 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 4498 | static const struct seq_operations packet_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4499 | .start = packet_seq_start, |
| 4500 | .next = packet_seq_next, |
| 4501 | .stop = packet_seq_stop, |
| 4502 | .show = packet_seq_show, |
| 4503 | }; |
| 4504 | |
| 4505 | static int packet_seq_open(struct inode *inode, struct file *file) |
| 4506 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 4507 | return seq_open_net(inode, file, &packet_seq_ops, |
| 4508 | sizeof(struct seq_net_private)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4509 | } |
| 4510 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 4511 | static const struct file_operations packet_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4512 | .owner = THIS_MODULE, |
| 4513 | .open = packet_seq_open, |
| 4514 | .read = seq_read, |
| 4515 | .llseek = seq_lseek, |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 4516 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4517 | }; |
| 4518 | |
| 4519 | #endif |
| 4520 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 4521 | static int __net_init packet_net_init(struct net *net) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 4522 | { |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 4523 | mutex_init(&net->packet.sklist_lock); |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 4524 | INIT_HLIST_HEAD(&net->packet.sklist); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 4525 | |
Gao feng | d4beaa6 | 2013-02-18 01:34:54 +0000 | [diff] [blame] | 4526 | if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops)) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 4527 | return -ENOMEM; |
| 4528 | |
| 4529 | return 0; |
| 4530 | } |
| 4531 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 4532 | static void __net_exit packet_net_exit(struct net *net) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 4533 | { |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 4534 | remove_proc_entry("packet", net->proc_net); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 4535 | } |
| 4536 | |
| 4537 | static struct pernet_operations packet_net_ops = { |
| 4538 | .init = packet_net_init, |
| 4539 | .exit = packet_net_exit, |
| 4540 | }; |
| 4541 | |
| 4542 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4543 | static void __exit packet_exit(void) |
| 4544 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4545 | unregister_netdevice_notifier(&packet_netdev_notifier); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 4546 | unregister_pernet_subsys(&packet_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4547 | sock_unregister(PF_PACKET); |
| 4548 | proto_unregister(&packet_proto); |
| 4549 | } |
| 4550 | |
| 4551 | static int __init packet_init(void) |
| 4552 | { |
| 4553 | int rc = proto_register(&packet_proto, 0); |
| 4554 | |
| 4555 | if (rc != 0) |
| 4556 | goto out; |
| 4557 | |
| 4558 | sock_register(&packet_family_ops); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 4559 | register_pernet_subsys(&packet_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4560 | register_netdevice_notifier(&packet_netdev_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4561 | out: |
| 4562 | return rc; |
| 4563 | } |
| 4564 | |
| 4565 | module_init(packet_init); |
| 4566 | module_exit(packet_exit); |
| 4567 | MODULE_LICENSE("GPL"); |
| 4568 | MODULE_ALIAS_NETPROTO(PF_PACKET); |