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 | 5df0ddf | 2013-08-28 22:13:09 +0200 | [diff] [blame] | 91 | #include <linux/reciprocal_div.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 |
| 95 | |
Pavel Emelyanov | 2787b04 | 2012-08-13 05:49:39 +0000 | [diff] [blame] | 96 | #include "internal.h" |
| 97 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | Assumptions: |
| 100 | - if device has no dev->hard_header routine, it adds and removes ll header |
| 101 | inside itself. In this case ll header is invisible outside of device, |
| 102 | but higher levels still should reserve dev->hard_header_len. |
| 103 | Some devices are enough clever to reallocate skb, when header |
| 104 | will not fit to reserved space (tunnel), another ones are silly |
| 105 | (PPP). |
| 106 | - packet socket receives packets with pulled ll header, |
| 107 | so that SOCK_RAW should push it back. |
| 108 | |
| 109 | On receive: |
| 110 | ----------- |
| 111 | |
| 112 | Incoming, dev->hard_header!=NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 113 | mac_header -> ll header |
| 114 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
| 116 | Outgoing, dev->hard_header!=NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 117 | mac_header -> ll header |
| 118 | data -> ll header |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
| 120 | Incoming, dev->hard_header==NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 121 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
| 122 | header. PPP makes it, that is wrong, because introduce |
YOSHIFUJI Hideaki | db0c58f | 2007-07-19 10:44:35 +0900 | [diff] [blame] | 123 | assymetry between rx and tx paths. |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 124 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
| 126 | Outgoing, dev->hard_header==NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 127 | mac_header -> data. ll header is still not built! |
| 128 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
| 130 | Resume |
| 131 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. |
| 132 | |
| 133 | |
| 134 | On transmit: |
| 135 | ------------ |
| 136 | |
| 137 | dev->hard_header != NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 138 | mac_header -> ll header |
| 139 | data -> ll header |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
| 141 | 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] | 142 | mac_header -> data |
| 143 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
| 145 | We should set nh.raw on output to correct posistion, |
| 146 | packet classifier depends on it. |
| 147 | */ |
| 148 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | /* Private packet socket structures. */ |
| 150 | |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 151 | /* identical to struct packet_mreq except it has |
| 152 | * a longer address field. |
| 153 | */ |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 154 | struct packet_mreq_max { |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 155 | int mr_ifindex; |
| 156 | unsigned short mr_type; |
| 157 | unsigned short mr_alen; |
| 158 | unsigned char mr_address[MAX_ADDR_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | }; |
David S. Miller | a2efcfa | 2007-05-29 13:12:50 -0700 | [diff] [blame] | 160 | |
Daniel Borkmann | 184f489 | 2013-04-16 01:57:46 +0000 | [diff] [blame] | 161 | union tpacket_uhdr { |
| 162 | struct tpacket_hdr *h1; |
| 163 | struct tpacket2_hdr *h2; |
| 164 | struct tpacket3_hdr *h3; |
| 165 | void *raw; |
| 166 | }; |
| 167 | |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 168 | 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] | 169 | int closing, int tx_ring); |
| 170 | |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 171 | #define V3_ALIGNMENT (8) |
| 172 | |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 173 | #define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT)) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 174 | |
| 175 | #define BLK_PLUS_PRIV(sz_of_priv) \ |
| 176 | (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT)) |
| 177 | |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 178 | #define PGV_FROM_VMALLOC 1 |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 179 | |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 180 | #define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status) |
| 181 | #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts) |
| 182 | #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt) |
| 183 | #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len) |
| 184 | #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num) |
| 185 | #define BLOCK_O2PRIV(x) ((x)->offset_to_priv) |
| 186 | #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x))) |
| 187 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 188 | struct packet_sock; |
| 189 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg); |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 190 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
| 191 | struct packet_type *pt, struct net_device *orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 193 | static void *packet_previous_frame(struct packet_sock *po, |
| 194 | struct packet_ring_buffer *rb, |
| 195 | int status); |
| 196 | static void packet_increment_head(struct packet_ring_buffer *buff); |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 197 | static int prb_curr_blk_in_use(struct tpacket_kbdq_core *, |
| 198 | struct tpacket_block_desc *); |
| 199 | static void *prb_dispatch_next_block(struct tpacket_kbdq_core *, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 200 | struct packet_sock *); |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 201 | static void prb_retire_current_block(struct tpacket_kbdq_core *, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 202 | struct packet_sock *, unsigned int status); |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 203 | static int prb_queue_frozen(struct tpacket_kbdq_core *); |
| 204 | static void prb_open_block(struct tpacket_kbdq_core *, |
| 205 | struct tpacket_block_desc *); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 206 | static void prb_retire_rx_blk_timer_expired(unsigned long); |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 207 | static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *); |
| 208 | static void prb_init_blk_timer(struct packet_sock *, |
| 209 | struct tpacket_kbdq_core *, |
| 210 | void (*func) (unsigned long)); |
| 211 | static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *); |
| 212 | static void prb_clear_rxhash(struct tpacket_kbdq_core *, |
| 213 | struct tpacket3_hdr *); |
| 214 | static void prb_fill_vlan_info(struct tpacket_kbdq_core *, |
| 215 | struct tpacket3_hdr *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | static void packet_flush_mclist(struct sock *sk); |
| 217 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 218 | struct packet_skb_cb { |
| 219 | unsigned int origlen; |
| 220 | union { |
| 221 | struct sockaddr_pkt pkt; |
| 222 | struct sockaddr_ll ll; |
| 223 | } sa; |
| 224 | }; |
| 225 | |
| 226 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 227 | |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 228 | #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] | 229 | #define GET_PBLOCK_DESC(x, bid) \ |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 230 | ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer)) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 231 | #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \ |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 232 | ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer)) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 233 | #define GET_NEXT_PRB_BLK_NUM(x) \ |
| 234 | (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \ |
| 235 | ((x)->kactive_blk_num+1) : 0) |
| 236 | |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 237 | static void __fanout_unlink(struct sock *sk, struct packet_sock *po); |
| 238 | static void __fanout_link(struct sock *sk, struct packet_sock *po); |
| 239 | |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 240 | /* register_prot_hook must be invoked with the po->bind_lock held, |
| 241 | * or from a context in which asynchronous accesses to the packet |
| 242 | * socket is not possible (packet_create()). |
| 243 | */ |
| 244 | static void register_prot_hook(struct sock *sk) |
| 245 | { |
| 246 | struct packet_sock *po = pkt_sk(sk); |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 247 | |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 248 | if (!po->running) { |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 249 | if (po->fanout) { |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 250 | __fanout_link(sk, po); |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 251 | } else { |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 252 | dev_add_pack(&po->prot_hook); |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 253 | rcu_assign_pointer(po->cached_dev, po->prot_hook.dev); |
| 254 | } |
| 255 | |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 256 | sock_hold(sk); |
| 257 | po->running = 1; |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | /* {,__}unregister_prot_hook() must be invoked with the po->bind_lock |
| 262 | * held. If the sync parameter is true, we will temporarily drop |
| 263 | * the po->bind_lock and do a synchronize_net to make sure no |
| 264 | * asynchronous packet processing paths still refer to the elements |
| 265 | * of po->prot_hook. If the sync parameter is false, it is the |
| 266 | * callers responsibility to take care of this. |
| 267 | */ |
| 268 | static void __unregister_prot_hook(struct sock *sk, bool sync) |
| 269 | { |
| 270 | struct packet_sock *po = pkt_sk(sk); |
| 271 | |
| 272 | po->running = 0; |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 273 | if (po->fanout) { |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 274 | __fanout_unlink(sk, po); |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 275 | } else { |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 276 | __dev_remove_pack(&po->prot_hook); |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 277 | RCU_INIT_POINTER(po->cached_dev, NULL); |
| 278 | } |
| 279 | |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 280 | __sock_put(sk); |
| 281 | |
| 282 | if (sync) { |
| 283 | spin_unlock(&po->bind_lock); |
| 284 | synchronize_net(); |
| 285 | spin_lock(&po->bind_lock); |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | static void unregister_prot_hook(struct sock *sk, bool sync) |
| 290 | { |
| 291 | struct packet_sock *po = pkt_sk(sk); |
| 292 | |
| 293 | if (po->running) |
| 294 | __unregister_prot_hook(sk, sync); |
| 295 | } |
| 296 | |
Changli Gao | f6dafa9 | 2010-12-07 04:26:16 +0000 | [diff] [blame] | 297 | static inline __pure struct page *pgv_to_page(void *addr) |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 298 | { |
| 299 | if (is_vmalloc_addr(addr)) |
| 300 | return vmalloc_to_page(addr); |
| 301 | return virt_to_page(addr); |
| 302 | } |
| 303 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 304 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
| 305 | { |
Daniel Borkmann | 184f489 | 2013-04-16 01:57:46 +0000 | [diff] [blame] | 306 | union tpacket_uhdr h; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 307 | |
| 308 | h.raw = frame; |
| 309 | switch (po->tp_version) { |
| 310 | case TPACKET_V1: |
| 311 | h.h1->tp_status = status; |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 312 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 313 | break; |
| 314 | case TPACKET_V2: |
| 315 | h.h2->tp_status = status; |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 316 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 317 | break; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 318 | case TPACKET_V3: |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 319 | default: |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 320 | WARN(1, "TPACKET version not supported.\n"); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 321 | BUG(); |
| 322 | } |
| 323 | |
| 324 | smp_wmb(); |
| 325 | } |
| 326 | |
| 327 | static int __packet_get_status(struct packet_sock *po, void *frame) |
| 328 | { |
Daniel Borkmann | 184f489 | 2013-04-16 01:57:46 +0000 | [diff] [blame] | 329 | union tpacket_uhdr h; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 330 | |
| 331 | smp_rmb(); |
| 332 | |
| 333 | h.raw = frame; |
| 334 | switch (po->tp_version) { |
| 335 | case TPACKET_V1: |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 336 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 337 | return h.h1->tp_status; |
| 338 | case TPACKET_V2: |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 339 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 340 | return h.h2->tp_status; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 341 | case TPACKET_V3: |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 342 | default: |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 343 | WARN(1, "TPACKET version not supported.\n"); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 344 | BUG(); |
| 345 | return 0; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 346 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 348 | |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 349 | static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts, |
| 350 | unsigned int flags) |
Daniel Borkmann | 7a51384 | 2013-04-23 00:39:29 +0000 | [diff] [blame] | 351 | { |
| 352 | struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb); |
| 353 | |
| 354 | if (shhwtstamps) { |
| 355 | if ((flags & SOF_TIMESTAMPING_SYS_HARDWARE) && |
| 356 | ktime_to_timespec_cond(shhwtstamps->syststamp, ts)) |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 357 | return TP_STATUS_TS_SYS_HARDWARE; |
Daniel Borkmann | 7a51384 | 2013-04-23 00:39:29 +0000 | [diff] [blame] | 358 | if ((flags & SOF_TIMESTAMPING_RAW_HARDWARE) && |
| 359 | ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts)) |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 360 | return TP_STATUS_TS_RAW_HARDWARE; |
Daniel Borkmann | 7a51384 | 2013-04-23 00:39:29 +0000 | [diff] [blame] | 361 | } |
| 362 | |
| 363 | if (ktime_to_timespec_cond(skb->tstamp, ts)) |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 364 | return TP_STATUS_TS_SOFTWARE; |
Daniel Borkmann | 7a51384 | 2013-04-23 00:39:29 +0000 | [diff] [blame] | 365 | |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 366 | return 0; |
Daniel Borkmann | 7a51384 | 2013-04-23 00:39:29 +0000 | [diff] [blame] | 367 | } |
| 368 | |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 369 | static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame, |
| 370 | struct sk_buff *skb) |
Willem de Bruijn | 2e31396 | 2013-04-23 00:39:28 +0000 | [diff] [blame] | 371 | { |
| 372 | union tpacket_uhdr h; |
| 373 | struct timespec ts; |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 374 | __u32 ts_status; |
Willem de Bruijn | 2e31396 | 2013-04-23 00:39:28 +0000 | [diff] [blame] | 375 | |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 376 | if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp))) |
| 377 | return 0; |
Willem de Bruijn | 2e31396 | 2013-04-23 00:39:28 +0000 | [diff] [blame] | 378 | |
| 379 | h.raw = frame; |
| 380 | switch (po->tp_version) { |
| 381 | case TPACKET_V1: |
| 382 | h.h1->tp_sec = ts.tv_sec; |
| 383 | h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC; |
| 384 | break; |
| 385 | case TPACKET_V2: |
| 386 | h.h2->tp_sec = ts.tv_sec; |
| 387 | h.h2->tp_nsec = ts.tv_nsec; |
| 388 | break; |
| 389 | case TPACKET_V3: |
| 390 | default: |
| 391 | WARN(1, "TPACKET version not supported.\n"); |
| 392 | BUG(); |
| 393 | } |
| 394 | |
| 395 | /* one flush is safe, as both fields always lie on the same cacheline */ |
| 396 | flush_dcache_page(pgv_to_page(&h.h1->tp_sec)); |
| 397 | smp_wmb(); |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 398 | |
| 399 | return ts_status; |
Willem de Bruijn | 2e31396 | 2013-04-23 00:39:28 +0000 | [diff] [blame] | 400 | } |
| 401 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 402 | static void *packet_lookup_frame(struct packet_sock *po, |
| 403 | struct packet_ring_buffer *rb, |
| 404 | unsigned int position, |
| 405 | int status) |
| 406 | { |
| 407 | unsigned int pg_vec_pos, frame_offset; |
Daniel Borkmann | 184f489 | 2013-04-16 01:57:46 +0000 | [diff] [blame] | 408 | union tpacket_uhdr h; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 409 | |
| 410 | pg_vec_pos = position / rb->frames_per_block; |
| 411 | frame_offset = position % rb->frames_per_block; |
| 412 | |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 413 | h.raw = rb->pg_vec[pg_vec_pos].buffer + |
| 414 | (frame_offset * rb->frame_size); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 415 | |
| 416 | if (status != __packet_get_status(po, h.raw)) |
| 417 | return NULL; |
| 418 | |
| 419 | return h.raw; |
| 420 | } |
| 421 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 422 | static void *packet_current_frame(struct packet_sock *po, |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 423 | struct packet_ring_buffer *rb, |
| 424 | int status) |
| 425 | { |
| 426 | return packet_lookup_frame(po, rb, rb->head, status); |
| 427 | } |
| 428 | |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 429 | static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 430 | { |
| 431 | del_timer_sync(&pkc->retire_blk_timer); |
| 432 | } |
| 433 | |
| 434 | static void prb_shutdown_retire_blk_timer(struct packet_sock *po, |
| 435 | int tx_ring, |
| 436 | struct sk_buff_head *rb_queue) |
| 437 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 438 | struct tpacket_kbdq_core *pkc; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 439 | |
| 440 | pkc = tx_ring ? &po->tx_ring.prb_bdqc : &po->rx_ring.prb_bdqc; |
| 441 | |
| 442 | spin_lock(&rb_queue->lock); |
| 443 | pkc->delete_blk_timer = 1; |
| 444 | spin_unlock(&rb_queue->lock); |
| 445 | |
| 446 | prb_del_retire_blk_timer(pkc); |
| 447 | } |
| 448 | |
| 449 | static void prb_init_blk_timer(struct packet_sock *po, |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 450 | struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 451 | void (*func) (unsigned long)) |
| 452 | { |
| 453 | init_timer(&pkc->retire_blk_timer); |
| 454 | pkc->retire_blk_timer.data = (long)po; |
| 455 | pkc->retire_blk_timer.function = func; |
| 456 | pkc->retire_blk_timer.expires = jiffies; |
| 457 | } |
| 458 | |
| 459 | static void prb_setup_retire_blk_timer(struct packet_sock *po, int tx_ring) |
| 460 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 461 | struct tpacket_kbdq_core *pkc; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 462 | |
| 463 | if (tx_ring) |
| 464 | BUG(); |
| 465 | |
| 466 | pkc = tx_ring ? &po->tx_ring.prb_bdqc : &po->rx_ring.prb_bdqc; |
| 467 | prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired); |
| 468 | } |
| 469 | |
| 470 | static int prb_calc_retire_blk_tmo(struct packet_sock *po, |
| 471 | int blk_size_in_bytes) |
| 472 | { |
| 473 | struct net_device *dev; |
| 474 | unsigned int mbits = 0, msec = 0, div = 0, tmo = 0; |
Jiri Pirko | 4bc71cb | 2011-09-03 03:34:30 +0000 | [diff] [blame] | 475 | struct ethtool_cmd ecmd; |
| 476 | int err; |
parav.pandit@emulex.com | e440cf2 | 2012-06-27 03:56:12 +0000 | [diff] [blame] | 477 | u32 speed; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 478 | |
Jiri Pirko | 4bc71cb | 2011-09-03 03:34:30 +0000 | [diff] [blame] | 479 | rtnl_lock(); |
| 480 | dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex); |
| 481 | if (unlikely(!dev)) { |
| 482 | rtnl_unlock(); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 483 | return DEFAULT_PRB_RETIRE_TOV; |
Jiri Pirko | 4bc71cb | 2011-09-03 03:34:30 +0000 | [diff] [blame] | 484 | } |
| 485 | err = __ethtool_get_settings(dev, &ecmd); |
parav.pandit@emulex.com | e440cf2 | 2012-06-27 03:56:12 +0000 | [diff] [blame] | 486 | speed = ethtool_cmd_speed(&ecmd); |
Jiri Pirko | 4bc71cb | 2011-09-03 03:34:30 +0000 | [diff] [blame] | 487 | rtnl_unlock(); |
| 488 | if (!err) { |
Jiri Pirko | 4bc71cb | 2011-09-03 03:34:30 +0000 | [diff] [blame] | 489 | /* |
| 490 | * If the link speed is so slow you don't really |
| 491 | * need to worry about perf anyways |
| 492 | */ |
parav.pandit@emulex.com | e440cf2 | 2012-06-27 03:56:12 +0000 | [diff] [blame] | 493 | if (speed < SPEED_1000 || speed == SPEED_UNKNOWN) { |
Jiri Pirko | 4bc71cb | 2011-09-03 03:34:30 +0000 | [diff] [blame] | 494 | return DEFAULT_PRB_RETIRE_TOV; |
parav.pandit@emulex.com | e440cf2 | 2012-06-27 03:56:12 +0000 | [diff] [blame] | 495 | } else { |
| 496 | msec = 1; |
| 497 | div = speed / 1000; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 498 | } |
| 499 | } |
| 500 | |
| 501 | mbits = (blk_size_in_bytes * 8) / (1024 * 1024); |
| 502 | |
| 503 | if (div) |
| 504 | mbits /= div; |
| 505 | |
| 506 | tmo = mbits * msec; |
| 507 | |
| 508 | if (div) |
| 509 | return tmo+1; |
| 510 | return tmo; |
| 511 | } |
| 512 | |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 513 | static void prb_init_ft_ops(struct tpacket_kbdq_core *p1, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 514 | union tpacket_req_u *req_u) |
| 515 | { |
| 516 | p1->feature_req_word = req_u->req3.tp_feature_req_word; |
| 517 | } |
| 518 | |
| 519 | static void init_prb_bdqc(struct packet_sock *po, |
| 520 | struct packet_ring_buffer *rb, |
| 521 | struct pgv *pg_vec, |
| 522 | union tpacket_req_u *req_u, int tx_ring) |
| 523 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 524 | struct tpacket_kbdq_core *p1 = &rb->prb_bdqc; |
| 525 | struct tpacket_block_desc *pbd; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 526 | |
| 527 | memset(p1, 0x0, sizeof(*p1)); |
| 528 | |
| 529 | p1->knxt_seq_num = 1; |
| 530 | p1->pkbdq = pg_vec; |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 531 | pbd = (struct tpacket_block_desc *)pg_vec[0].buffer; |
Joe Perches | e319269 | 2012-06-03 17:41:40 +0000 | [diff] [blame] | 532 | p1->pkblk_start = pg_vec[0].buffer; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 533 | p1->kblk_size = req_u->req3.tp_block_size; |
| 534 | p1->knum_blocks = req_u->req3.tp_block_nr; |
| 535 | p1->hdrlen = po->tp_hdrlen; |
| 536 | p1->version = po->tp_version; |
| 537 | p1->last_kactive_blk_num = 0; |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 538 | po->stats.stats3.tp_freeze_q_cnt = 0; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 539 | if (req_u->req3.tp_retire_blk_tov) |
| 540 | p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov; |
| 541 | else |
| 542 | p1->retire_blk_tov = prb_calc_retire_blk_tmo(po, |
| 543 | req_u->req3.tp_block_size); |
| 544 | p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov); |
| 545 | p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv; |
| 546 | |
| 547 | prb_init_ft_ops(p1, req_u); |
| 548 | prb_setup_retire_blk_timer(po, tx_ring); |
| 549 | prb_open_block(p1, pbd); |
| 550 | } |
| 551 | |
| 552 | /* Do NOT update the last_blk_num first. |
| 553 | * Assumes sk_buff_head lock is held. |
| 554 | */ |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 555 | 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] | 556 | { |
| 557 | mod_timer(&pkc->retire_blk_timer, |
| 558 | jiffies + pkc->tov_in_jiffies); |
| 559 | pkc->last_kactive_blk_num = pkc->kactive_blk_num; |
| 560 | } |
| 561 | |
| 562 | /* |
| 563 | * Timer logic: |
| 564 | * 1) We refresh the timer only when we open a block. |
| 565 | * By doing this we don't waste cycles refreshing the timer |
| 566 | * on packet-by-packet basis. |
| 567 | * |
| 568 | * With a 1MB block-size, on a 1Gbps line, it will take |
| 569 | * i) ~8 ms to fill a block + ii) memcpy etc. |
| 570 | * In this cut we are not accounting for the memcpy time. |
| 571 | * |
| 572 | * So, if the user sets the 'tmo' to 10ms then the timer |
| 573 | * will never fire while the block is still getting filled |
| 574 | * (which is what we want). However, the user could choose |
| 575 | * to close a block early and that's fine. |
| 576 | * |
| 577 | * But when the timer does fire, we check whether or not to refresh it. |
| 578 | * Since the tmo granularity is in msecs, it is not too expensive |
| 579 | * to refresh the timer, lets say every '8' msecs. |
| 580 | * Either the user can set the 'tmo' or we can derive it based on |
| 581 | * a) line-speed and b) block-size. |
| 582 | * prb_calc_retire_blk_tmo() calculates the tmo. |
| 583 | * |
| 584 | */ |
| 585 | static void prb_retire_rx_blk_timer_expired(unsigned long data) |
| 586 | { |
| 587 | struct packet_sock *po = (struct packet_sock *)data; |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 588 | struct tpacket_kbdq_core *pkc = &po->rx_ring.prb_bdqc; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 589 | unsigned int frozen; |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 590 | struct tpacket_block_desc *pbd; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 591 | |
| 592 | spin_lock(&po->sk.sk_receive_queue.lock); |
| 593 | |
| 594 | frozen = prb_queue_frozen(pkc); |
| 595 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
| 596 | |
| 597 | if (unlikely(pkc->delete_blk_timer)) |
| 598 | goto out; |
| 599 | |
| 600 | /* We only need to plug the race when the block is partially filled. |
| 601 | * tpacket_rcv: |
| 602 | * lock(); increment BLOCK_NUM_PKTS; unlock() |
| 603 | * copy_bits() is in progress ... |
| 604 | * timer fires on other cpu: |
| 605 | * we can't retire the current block because copy_bits |
| 606 | * is in progress. |
| 607 | * |
| 608 | */ |
| 609 | if (BLOCK_NUM_PKTS(pbd)) { |
| 610 | while (atomic_read(&pkc->blk_fill_in_prog)) { |
| 611 | /* Waiting for skb_copy_bits to finish... */ |
| 612 | cpu_relax(); |
| 613 | } |
| 614 | } |
| 615 | |
| 616 | if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) { |
| 617 | if (!frozen) { |
| 618 | prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO); |
| 619 | if (!prb_dispatch_next_block(pkc, po)) |
| 620 | goto refresh_timer; |
| 621 | else |
| 622 | goto out; |
| 623 | } else { |
| 624 | /* Case 1. Queue was frozen because user-space was |
| 625 | * lagging behind. |
| 626 | */ |
| 627 | if (prb_curr_blk_in_use(pkc, pbd)) { |
| 628 | /* |
| 629 | * Ok, user-space is still behind. |
| 630 | * So just refresh the timer. |
| 631 | */ |
| 632 | goto refresh_timer; |
| 633 | } else { |
| 634 | /* Case 2. queue was frozen,user-space caught up, |
| 635 | * now the link went idle && the timer fired. |
| 636 | * We don't have a block to close.So we open this |
| 637 | * block and restart the timer. |
| 638 | * opening a block thaws the queue,restarts timer |
| 639 | * Thawing/timer-refresh is a side effect. |
| 640 | */ |
| 641 | prb_open_block(pkc, pbd); |
| 642 | goto out; |
| 643 | } |
| 644 | } |
| 645 | } |
| 646 | |
| 647 | refresh_timer: |
| 648 | _prb_refresh_rx_retire_blk_timer(pkc); |
| 649 | |
| 650 | out: |
| 651 | spin_unlock(&po->sk.sk_receive_queue.lock); |
| 652 | } |
| 653 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 654 | static void prb_flush_block(struct tpacket_kbdq_core *pkc1, |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 655 | struct tpacket_block_desc *pbd1, __u32 status) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 656 | { |
| 657 | /* Flush everything minus the block header */ |
| 658 | |
| 659 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
| 660 | u8 *start, *end; |
| 661 | |
| 662 | start = (u8 *)pbd1; |
| 663 | |
| 664 | /* Skip the block header(we know header WILL fit in 4K) */ |
| 665 | start += PAGE_SIZE; |
| 666 | |
| 667 | end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end); |
| 668 | for (; start < end; start += PAGE_SIZE) |
| 669 | flush_dcache_page(pgv_to_page(start)); |
| 670 | |
| 671 | smp_wmb(); |
| 672 | #endif |
| 673 | |
| 674 | /* Now update the block status. */ |
| 675 | |
| 676 | BLOCK_STATUS(pbd1) = status; |
| 677 | |
| 678 | /* Flush the block header */ |
| 679 | |
| 680 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
| 681 | start = (u8 *)pbd1; |
| 682 | flush_dcache_page(pgv_to_page(start)); |
| 683 | |
| 684 | smp_wmb(); |
| 685 | #endif |
| 686 | } |
| 687 | |
| 688 | /* |
| 689 | * Side effect: |
| 690 | * |
| 691 | * 1) flush the block |
| 692 | * 2) Increment active_blk_num |
| 693 | * |
| 694 | * Note:We DONT refresh the timer on purpose. |
| 695 | * Because almost always the next block will be opened. |
| 696 | */ |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 697 | static void prb_close_block(struct tpacket_kbdq_core *pkc1, |
| 698 | struct tpacket_block_desc *pbd1, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 699 | struct packet_sock *po, unsigned int stat) |
| 700 | { |
| 701 | __u32 status = TP_STATUS_USER | stat; |
| 702 | |
| 703 | struct tpacket3_hdr *last_pkt; |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 704 | struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 705 | |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 706 | if (po->stats.stats3.tp_drops) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 707 | status |= TP_STATUS_LOSING; |
| 708 | |
| 709 | last_pkt = (struct tpacket3_hdr *)pkc1->prev; |
| 710 | last_pkt->tp_next_offset = 0; |
| 711 | |
| 712 | /* Get the ts of the last pkt */ |
| 713 | if (BLOCK_NUM_PKTS(pbd1)) { |
| 714 | h1->ts_last_pkt.ts_sec = last_pkt->tp_sec; |
| 715 | h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec; |
| 716 | } else { |
| 717 | /* Ok, we tmo'd - so get the current time */ |
| 718 | struct timespec ts; |
| 719 | getnstimeofday(&ts); |
| 720 | h1->ts_last_pkt.ts_sec = ts.tv_sec; |
| 721 | h1->ts_last_pkt.ts_nsec = ts.tv_nsec; |
| 722 | } |
| 723 | |
| 724 | smp_wmb(); |
| 725 | |
| 726 | /* Flush the block */ |
| 727 | prb_flush_block(pkc1, pbd1, status); |
| 728 | |
| 729 | pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1); |
| 730 | } |
| 731 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 732 | static void prb_thaw_queue(struct tpacket_kbdq_core *pkc) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 733 | { |
| 734 | pkc->reset_pending_on_curr_blk = 0; |
| 735 | } |
| 736 | |
| 737 | /* |
| 738 | * Side effect of opening a block: |
| 739 | * |
| 740 | * 1) prb_queue is thawed. |
| 741 | * 2) retire_blk_timer is refreshed. |
| 742 | * |
| 743 | */ |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 744 | static void prb_open_block(struct tpacket_kbdq_core *pkc1, |
| 745 | struct tpacket_block_desc *pbd1) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 746 | { |
| 747 | struct timespec ts; |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 748 | struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 749 | |
| 750 | smp_rmb(); |
| 751 | |
Daniel Borkmann | 8da3056 | 2013-05-03 02:57:00 +0000 | [diff] [blame] | 752 | /* We could have just memset this but we will lose the |
| 753 | * flexibility of making the priv area sticky |
| 754 | */ |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 755 | |
Daniel Borkmann | 8da3056 | 2013-05-03 02:57:00 +0000 | [diff] [blame] | 756 | BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++; |
| 757 | BLOCK_NUM_PKTS(pbd1) = 0; |
| 758 | BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 759 | |
Daniel Borkmann | 8da3056 | 2013-05-03 02:57:00 +0000 | [diff] [blame] | 760 | getnstimeofday(&ts); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 761 | |
Daniel Borkmann | 8da3056 | 2013-05-03 02:57:00 +0000 | [diff] [blame] | 762 | h1->ts_first_pkt.ts_sec = ts.tv_sec; |
| 763 | h1->ts_first_pkt.ts_nsec = ts.tv_nsec; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 764 | |
Daniel Borkmann | 8da3056 | 2013-05-03 02:57:00 +0000 | [diff] [blame] | 765 | pkc1->pkblk_start = (char *)pbd1; |
| 766 | pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); |
| 767 | |
| 768 | BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); |
| 769 | BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN; |
| 770 | |
| 771 | pbd1->version = pkc1->version; |
| 772 | pkc1->prev = pkc1->nxt_offset; |
| 773 | pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size; |
| 774 | |
| 775 | prb_thaw_queue(pkc1); |
| 776 | _prb_refresh_rx_retire_blk_timer(pkc1); |
| 777 | |
| 778 | smp_wmb(); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 779 | } |
| 780 | |
| 781 | /* |
| 782 | * Queue freeze logic: |
| 783 | * 1) Assume tp_block_nr = 8 blocks. |
| 784 | * 2) At time 't0', user opens Rx ring. |
| 785 | * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7 |
| 786 | * 4) user-space is either sleeping or processing block '0'. |
| 787 | * 5) tpacket_rcv is currently filling block '7', since there is no space left, |
| 788 | * it will close block-7,loop around and try to fill block '0'. |
| 789 | * call-flow: |
| 790 | * __packet_lookup_frame_in_block |
| 791 | * prb_retire_current_block() |
| 792 | * prb_dispatch_next_block() |
| 793 | * |->(BLOCK_STATUS == USER) evaluates to true |
| 794 | * 5.1) Since block-0 is currently in-use, we just freeze the queue. |
| 795 | * 6) Now there are two cases: |
| 796 | * 6.1) Link goes idle right after the queue is frozen. |
| 797 | * But remember, the last open_block() refreshed the timer. |
| 798 | * When this timer expires,it will refresh itself so that we can |
| 799 | * re-open block-0 in near future. |
| 800 | * 6.2) Link is busy and keeps on receiving packets. This is a simple |
| 801 | * case and __packet_lookup_frame_in_block will check if block-0 |
| 802 | * is free and can now be re-used. |
| 803 | */ |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 804 | static void prb_freeze_queue(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 805 | struct packet_sock *po) |
| 806 | { |
| 807 | pkc->reset_pending_on_curr_blk = 1; |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 808 | po->stats.stats3.tp_freeze_q_cnt++; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 809 | } |
| 810 | |
| 811 | #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT)) |
| 812 | |
| 813 | /* |
| 814 | * If the next block is free then we will dispatch it |
| 815 | * and return a good offset. |
| 816 | * Else, we will freeze the queue. |
| 817 | * So, caller must check the return value. |
| 818 | */ |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 819 | static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 820 | struct packet_sock *po) |
| 821 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 822 | struct tpacket_block_desc *pbd; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 823 | |
| 824 | smp_rmb(); |
| 825 | |
| 826 | /* 1. Get current block num */ |
| 827 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
| 828 | |
| 829 | /* 2. If this block is currently in_use then freeze the queue */ |
| 830 | if (TP_STATUS_USER & BLOCK_STATUS(pbd)) { |
| 831 | prb_freeze_queue(pkc, po); |
| 832 | return NULL; |
| 833 | } |
| 834 | |
| 835 | /* |
| 836 | * 3. |
| 837 | * open this block and return the offset where the first packet |
| 838 | * needs to get stored. |
| 839 | */ |
| 840 | prb_open_block(pkc, pbd); |
| 841 | return (void *)pkc->nxt_offset; |
| 842 | } |
| 843 | |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 844 | static void prb_retire_current_block(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 845 | struct packet_sock *po, unsigned int status) |
| 846 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 847 | struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 848 | |
| 849 | /* retire/close the current block */ |
| 850 | if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) { |
| 851 | /* |
| 852 | * Plug the case where copy_bits() is in progress on |
| 853 | * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't |
| 854 | * have space to copy the pkt in the current block and |
| 855 | * called prb_retire_current_block() |
| 856 | * |
| 857 | * We don't need to worry about the TMO case because |
| 858 | * the timer-handler already handled this case. |
| 859 | */ |
| 860 | if (!(status & TP_STATUS_BLK_TMO)) { |
| 861 | while (atomic_read(&pkc->blk_fill_in_prog)) { |
| 862 | /* Waiting for skb_copy_bits to finish... */ |
| 863 | cpu_relax(); |
| 864 | } |
| 865 | } |
| 866 | prb_close_block(pkc, pbd, po, status); |
| 867 | return; |
| 868 | } |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 869 | } |
| 870 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 871 | static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc, |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 872 | struct tpacket_block_desc *pbd) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 873 | { |
| 874 | return TP_STATUS_USER & BLOCK_STATUS(pbd); |
| 875 | } |
| 876 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 877 | static int prb_queue_frozen(struct tpacket_kbdq_core *pkc) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 878 | { |
| 879 | return pkc->reset_pending_on_curr_blk; |
| 880 | } |
| 881 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 882 | static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 883 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 884 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 885 | atomic_dec(&pkc->blk_fill_in_prog); |
| 886 | } |
| 887 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 888 | static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 889 | struct tpacket3_hdr *ppd) |
| 890 | { |
| 891 | ppd->hv1.tp_rxhash = skb_get_rxhash(pkc->skb); |
| 892 | } |
| 893 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 894 | static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 895 | struct tpacket3_hdr *ppd) |
| 896 | { |
| 897 | ppd->hv1.tp_rxhash = 0; |
| 898 | } |
| 899 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 900 | static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 901 | struct tpacket3_hdr *ppd) |
| 902 | { |
| 903 | if (vlan_tx_tag_present(pkc->skb)) { |
| 904 | ppd->hv1.tp_vlan_tci = vlan_tx_tag_get(pkc->skb); |
| 905 | ppd->tp_status = TP_STATUS_VLAN_VALID; |
| 906 | } else { |
danborkmann@iogearbox.net | 9e67030 | 2012-08-20 03:34:03 +0000 | [diff] [blame] | 907 | ppd->hv1.tp_vlan_tci = 0; |
| 908 | ppd->tp_status = TP_STATUS_AVAILABLE; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 909 | } |
| 910 | } |
| 911 | |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 912 | static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 913 | struct tpacket3_hdr *ppd) |
| 914 | { |
| 915 | prb_fill_vlan_info(pkc, ppd); |
| 916 | |
| 917 | if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH) |
| 918 | prb_fill_rxhash(pkc, ppd); |
| 919 | else |
| 920 | prb_clear_rxhash(pkc, ppd); |
| 921 | } |
| 922 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 923 | static void prb_fill_curr_block(char *curr, |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 924 | struct tpacket_kbdq_core *pkc, |
| 925 | struct tpacket_block_desc *pbd, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 926 | unsigned int len) |
| 927 | { |
| 928 | struct tpacket3_hdr *ppd; |
| 929 | |
| 930 | ppd = (struct tpacket3_hdr *)curr; |
| 931 | ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len); |
| 932 | pkc->prev = curr; |
| 933 | pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len); |
| 934 | BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len); |
| 935 | BLOCK_NUM_PKTS(pbd) += 1; |
| 936 | atomic_inc(&pkc->blk_fill_in_prog); |
| 937 | prb_run_all_ft_ops(pkc, ppd); |
| 938 | } |
| 939 | |
| 940 | /* Assumes caller has the sk->rx_queue.lock */ |
| 941 | static void *__packet_lookup_frame_in_block(struct packet_sock *po, |
| 942 | struct sk_buff *skb, |
| 943 | int status, |
| 944 | unsigned int len |
| 945 | ) |
| 946 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 947 | struct tpacket_kbdq_core *pkc; |
| 948 | struct tpacket_block_desc *pbd; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 949 | char *curr, *end; |
| 950 | |
Joe Perches | e319269 | 2012-06-03 17:41:40 +0000 | [diff] [blame] | 951 | pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 952 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
| 953 | |
| 954 | /* Queue is frozen when user space is lagging behind */ |
| 955 | if (prb_queue_frozen(pkc)) { |
| 956 | /* |
| 957 | * Check if that last block which caused the queue to freeze, |
| 958 | * is still in_use by user-space. |
| 959 | */ |
| 960 | if (prb_curr_blk_in_use(pkc, pbd)) { |
| 961 | /* Can't record this packet */ |
| 962 | return NULL; |
| 963 | } else { |
| 964 | /* |
| 965 | * Ok, the block was released by user-space. |
| 966 | * Now let's open that block. |
| 967 | * opening a block also thaws the queue. |
| 968 | * Thawing is a side effect. |
| 969 | */ |
| 970 | prb_open_block(pkc, pbd); |
| 971 | } |
| 972 | } |
| 973 | |
| 974 | smp_mb(); |
| 975 | curr = pkc->nxt_offset; |
| 976 | pkc->skb = skb; |
Joe Perches | e319269 | 2012-06-03 17:41:40 +0000 | [diff] [blame] | 977 | end = (char *)pbd + pkc->kblk_size; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 978 | |
| 979 | /* first try the current block */ |
| 980 | if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) { |
| 981 | prb_fill_curr_block(curr, pkc, pbd, len); |
| 982 | return (void *)curr; |
| 983 | } |
| 984 | |
| 985 | /* Ok, close the current block */ |
| 986 | prb_retire_current_block(pkc, po, 0); |
| 987 | |
| 988 | /* Now, try to dispatch the next block */ |
| 989 | curr = (char *)prb_dispatch_next_block(pkc, po); |
| 990 | if (curr) { |
| 991 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
| 992 | prb_fill_curr_block(curr, pkc, pbd, len); |
| 993 | return (void *)curr; |
| 994 | } |
| 995 | |
| 996 | /* |
| 997 | * No free blocks are available.user_space hasn't caught up yet. |
| 998 | * Queue was just frozen and now this packet will get dropped. |
| 999 | */ |
| 1000 | return NULL; |
| 1001 | } |
| 1002 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1003 | static void *packet_current_rx_frame(struct packet_sock *po, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1004 | struct sk_buff *skb, |
| 1005 | int status, unsigned int len) |
| 1006 | { |
| 1007 | char *curr = NULL; |
| 1008 | switch (po->tp_version) { |
| 1009 | case TPACKET_V1: |
| 1010 | case TPACKET_V2: |
| 1011 | curr = packet_lookup_frame(po, &po->rx_ring, |
| 1012 | po->rx_ring.head, status); |
| 1013 | return curr; |
| 1014 | case TPACKET_V3: |
| 1015 | return __packet_lookup_frame_in_block(po, skb, status, len); |
| 1016 | default: |
| 1017 | WARN(1, "TPACKET version not supported\n"); |
| 1018 | BUG(); |
Ying Xue | 99aa347 | 2012-08-06 16:27:10 +0000 | [diff] [blame] | 1019 | return NULL; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1020 | } |
| 1021 | } |
| 1022 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1023 | static void *prb_lookup_block(struct packet_sock *po, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1024 | struct packet_ring_buffer *rb, |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1025 | unsigned int idx, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1026 | int status) |
| 1027 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 1028 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb); |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1029 | struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1030 | |
| 1031 | if (status != BLOCK_STATUS(pbd)) |
| 1032 | return NULL; |
| 1033 | return pbd; |
| 1034 | } |
| 1035 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1036 | static int prb_previous_blk_num(struct packet_ring_buffer *rb) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1037 | { |
| 1038 | unsigned int prev; |
| 1039 | if (rb->prb_bdqc.kactive_blk_num) |
| 1040 | prev = rb->prb_bdqc.kactive_blk_num-1; |
| 1041 | else |
| 1042 | prev = rb->prb_bdqc.knum_blocks-1; |
| 1043 | return prev; |
| 1044 | } |
| 1045 | |
| 1046 | /* Assumes caller has held the rx_queue.lock */ |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1047 | static void *__prb_previous_block(struct packet_sock *po, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1048 | struct packet_ring_buffer *rb, |
| 1049 | int status) |
| 1050 | { |
| 1051 | unsigned int previous = prb_previous_blk_num(rb); |
| 1052 | return prb_lookup_block(po, rb, previous, status); |
| 1053 | } |
| 1054 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1055 | static void *packet_previous_rx_frame(struct packet_sock *po, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1056 | struct packet_ring_buffer *rb, |
| 1057 | int status) |
| 1058 | { |
| 1059 | if (po->tp_version <= TPACKET_V2) |
| 1060 | return packet_previous_frame(po, rb, status); |
| 1061 | |
| 1062 | return __prb_previous_block(po, rb, status); |
| 1063 | } |
| 1064 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1065 | static void packet_increment_rx_head(struct packet_sock *po, |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1066 | struct packet_ring_buffer *rb) |
| 1067 | { |
| 1068 | switch (po->tp_version) { |
| 1069 | case TPACKET_V1: |
| 1070 | case TPACKET_V2: |
| 1071 | return packet_increment_head(rb); |
| 1072 | case TPACKET_V3: |
| 1073 | default: |
| 1074 | WARN(1, "TPACKET version not supported.\n"); |
| 1075 | BUG(); |
| 1076 | return; |
| 1077 | } |
| 1078 | } |
| 1079 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1080 | static void *packet_previous_frame(struct packet_sock *po, |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1081 | struct packet_ring_buffer *rb, |
| 1082 | int status) |
| 1083 | { |
| 1084 | unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; |
| 1085 | return packet_lookup_frame(po, rb, previous, status); |
| 1086 | } |
| 1087 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1088 | static void packet_increment_head(struct packet_ring_buffer *buff) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1089 | { |
| 1090 | buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; |
| 1091 | } |
| 1092 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1093 | static bool packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb) |
| 1094 | { |
| 1095 | struct sock *sk = &po->sk; |
| 1096 | bool has_room; |
| 1097 | |
| 1098 | if (po->prot_hook.func != tpacket_rcv) |
| 1099 | return (atomic_read(&sk->sk_rmem_alloc) + skb->truesize) |
| 1100 | <= sk->sk_rcvbuf; |
| 1101 | |
| 1102 | spin_lock(&sk->sk_receive_queue.lock); |
| 1103 | if (po->tp_version == TPACKET_V3) |
| 1104 | has_room = prb_lookup_block(po, &po->rx_ring, |
| 1105 | po->rx_ring.prb_bdqc.kactive_blk_num, |
| 1106 | TP_STATUS_KERNEL); |
| 1107 | else |
| 1108 | has_room = packet_lookup_frame(po, &po->rx_ring, |
| 1109 | po->rx_ring.head, |
| 1110 | TP_STATUS_KERNEL); |
| 1111 | spin_unlock(&sk->sk_receive_queue.lock); |
| 1112 | |
| 1113 | return has_room; |
| 1114 | } |
| 1115 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | static void packet_sock_destruct(struct sock *sk) |
| 1117 | { |
Richard Cochran | ed85b56 | 2010-04-07 22:41:28 +0000 | [diff] [blame] | 1118 | skb_queue_purge(&sk->sk_error_queue); |
| 1119 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1120 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
| 1121 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | |
| 1123 | if (!sock_flag(sk, SOCK_DEAD)) { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1124 | pr_err("Attempt to release alive packet socket: %p\n", sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | return; |
| 1126 | } |
| 1127 | |
Pavel Emelyanov | 17ab56a | 2007-11-10 21:38:48 -0800 | [diff] [blame] | 1128 | sk_refcnt_debug_dec(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | } |
| 1130 | |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1131 | static int fanout_rr_next(struct packet_fanout *f, unsigned int num) |
| 1132 | { |
| 1133 | int x = atomic_read(&f->rr_cur) + 1; |
| 1134 | |
| 1135 | if (x >= num) |
| 1136 | x = 0; |
| 1137 | |
| 1138 | return x; |
| 1139 | } |
| 1140 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1141 | static unsigned int fanout_demux_hash(struct packet_fanout *f, |
| 1142 | struct sk_buff *skb, |
| 1143 | unsigned int num) |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1144 | { |
Daniel Borkmann | f55d112e | 2013-08-28 22:13:10 +0200 | [diff] [blame] | 1145 | return reciprocal_divide(skb->rxhash, num); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1146 | } |
| 1147 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1148 | static unsigned int fanout_demux_lb(struct packet_fanout *f, |
| 1149 | struct sk_buff *skb, |
| 1150 | unsigned int num) |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1151 | { |
| 1152 | int cur, old; |
| 1153 | |
| 1154 | cur = atomic_read(&f->rr_cur); |
| 1155 | while ((old = atomic_cmpxchg(&f->rr_cur, cur, |
| 1156 | fanout_rr_next(f, num))) != cur) |
| 1157 | cur = old; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1158 | return cur; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1159 | } |
| 1160 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1161 | static unsigned int fanout_demux_cpu(struct packet_fanout *f, |
| 1162 | struct sk_buff *skb, |
| 1163 | unsigned int num) |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1164 | { |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1165 | return smp_processor_id() % num; |
| 1166 | } |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1167 | |
Daniel Borkmann | 5df0ddf | 2013-08-28 22:13:09 +0200 | [diff] [blame] | 1168 | static unsigned int fanout_demux_rnd(struct packet_fanout *f, |
| 1169 | struct sk_buff *skb, |
| 1170 | unsigned int num) |
| 1171 | { |
| 1172 | return reciprocal_divide(prandom_u32(), num); |
| 1173 | } |
| 1174 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1175 | static unsigned int fanout_demux_rollover(struct packet_fanout *f, |
| 1176 | struct sk_buff *skb, |
| 1177 | unsigned int idx, unsigned int skip, |
| 1178 | unsigned int num) |
| 1179 | { |
| 1180 | unsigned int i, j; |
| 1181 | |
| 1182 | i = j = min_t(int, f->next[idx], num - 1); |
| 1183 | do { |
| 1184 | if (i != skip && packet_rcv_has_room(pkt_sk(f->arr[i]), skb)) { |
| 1185 | if (i != j) |
| 1186 | f->next[idx] = i; |
| 1187 | return i; |
| 1188 | } |
| 1189 | if (++i == num) |
| 1190 | i = 0; |
| 1191 | } while (i != j); |
| 1192 | |
| 1193 | return idx; |
| 1194 | } |
| 1195 | |
| 1196 | static bool fanout_has_flag(struct packet_fanout *f, u16 flag) |
| 1197 | { |
| 1198 | return f->flags & (flag >> 8); |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1199 | } |
| 1200 | |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1201 | static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev, |
| 1202 | struct packet_type *pt, struct net_device *orig_dev) |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1203 | { |
| 1204 | struct packet_fanout *f = pt->af_packet_priv; |
| 1205 | unsigned int num = f->num_members; |
| 1206 | struct packet_sock *po; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1207 | unsigned int idx; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1208 | |
| 1209 | if (!net_eq(dev_net(dev), read_pnet(&f->net)) || |
| 1210 | !num) { |
| 1211 | kfree_skb(skb); |
| 1212 | return 0; |
| 1213 | } |
| 1214 | |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1215 | switch (f->type) { |
| 1216 | case PACKET_FANOUT_HASH: |
| 1217 | default: |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1218 | if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) { |
Eric Dumazet | bc416d9 | 2011-10-06 10:28:31 +0000 | [diff] [blame] | 1219 | skb = ip_check_defrag(skb, IP_DEFRAG_AF_PACKET); |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1220 | if (!skb) |
| 1221 | return 0; |
| 1222 | } |
| 1223 | skb_get_rxhash(skb); |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1224 | idx = fanout_demux_hash(f, skb, num); |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1225 | break; |
| 1226 | case PACKET_FANOUT_LB: |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1227 | idx = fanout_demux_lb(f, skb, num); |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1228 | break; |
| 1229 | case PACKET_FANOUT_CPU: |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1230 | idx = fanout_demux_cpu(f, skb, num); |
| 1231 | break; |
Daniel Borkmann | 5df0ddf | 2013-08-28 22:13:09 +0200 | [diff] [blame] | 1232 | case PACKET_FANOUT_RND: |
| 1233 | idx = fanout_demux_rnd(f, skb, num); |
| 1234 | break; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1235 | case PACKET_FANOUT_ROLLOVER: |
| 1236 | idx = fanout_demux_rollover(f, skb, 0, (unsigned int) -1, num); |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1237 | break; |
David S. Miller | 7736d33 | 2011-07-05 01:43:20 -0700 | [diff] [blame] | 1238 | } |
| 1239 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1240 | po = pkt_sk(f->arr[idx]); |
| 1241 | if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER) && |
| 1242 | unlikely(!packet_rcv_has_room(po, skb))) { |
| 1243 | idx = fanout_demux_rollover(f, skb, idx, idx, num); |
| 1244 | po = pkt_sk(f->arr[idx]); |
| 1245 | } |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1246 | |
| 1247 | return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev); |
| 1248 | } |
| 1249 | |
Pavel Emelyanov | fff3321 | 2012-08-16 05:36:48 +0000 | [diff] [blame] | 1250 | DEFINE_MUTEX(fanout_mutex); |
| 1251 | EXPORT_SYMBOL_GPL(fanout_mutex); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1252 | static LIST_HEAD(fanout_list); |
| 1253 | |
| 1254 | static void __fanout_link(struct sock *sk, struct packet_sock *po) |
| 1255 | { |
| 1256 | struct packet_fanout *f = po->fanout; |
| 1257 | |
| 1258 | spin_lock(&f->lock); |
| 1259 | f->arr[f->num_members] = sk; |
| 1260 | smp_wmb(); |
| 1261 | f->num_members++; |
| 1262 | spin_unlock(&f->lock); |
| 1263 | } |
| 1264 | |
| 1265 | static void __fanout_unlink(struct sock *sk, struct packet_sock *po) |
| 1266 | { |
| 1267 | struct packet_fanout *f = po->fanout; |
| 1268 | int i; |
| 1269 | |
| 1270 | spin_lock(&f->lock); |
| 1271 | for (i = 0; i < f->num_members; i++) { |
| 1272 | if (f->arr[i] == sk) |
| 1273 | break; |
| 1274 | } |
| 1275 | BUG_ON(i >= f->num_members); |
| 1276 | f->arr[i] = f->arr[f->num_members - 1]; |
| 1277 | f->num_members--; |
| 1278 | spin_unlock(&f->lock); |
| 1279 | } |
| 1280 | |
Fengguang Wu | a0dfb26 | 2012-08-23 19:51:21 +0800 | [diff] [blame] | 1281 | static bool match_fanout_group(struct packet_type *ptype, struct sock * sk) |
Eric Leblond | c0de08d | 2012-08-16 22:02:58 +0000 | [diff] [blame] | 1282 | { |
| 1283 | if (ptype->af_packet_priv == (void*)((struct packet_sock *)sk)->fanout) |
| 1284 | return true; |
| 1285 | |
| 1286 | return false; |
| 1287 | } |
| 1288 | |
David S. Miller | 7736d33 | 2011-07-05 01:43:20 -0700 | [diff] [blame] | 1289 | 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] | 1290 | { |
| 1291 | struct packet_sock *po = pkt_sk(sk); |
| 1292 | struct packet_fanout *f, *match; |
David S. Miller | 7736d33 | 2011-07-05 01:43:20 -0700 | [diff] [blame] | 1293 | u8 type = type_flags & 0xff; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1294 | u8 flags = type_flags >> 8; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1295 | int err; |
| 1296 | |
| 1297 | switch (type) { |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1298 | case PACKET_FANOUT_ROLLOVER: |
| 1299 | if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER) |
| 1300 | return -EINVAL; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1301 | case PACKET_FANOUT_HASH: |
| 1302 | case PACKET_FANOUT_LB: |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1303 | case PACKET_FANOUT_CPU: |
Daniel Borkmann | 5df0ddf | 2013-08-28 22:13:09 +0200 | [diff] [blame] | 1304 | case PACKET_FANOUT_RND: |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1305 | break; |
| 1306 | default: |
| 1307 | return -EINVAL; |
| 1308 | } |
| 1309 | |
| 1310 | if (!po->running) |
| 1311 | return -EINVAL; |
| 1312 | |
| 1313 | if (po->fanout) |
| 1314 | return -EALREADY; |
| 1315 | |
| 1316 | mutex_lock(&fanout_mutex); |
| 1317 | match = NULL; |
| 1318 | list_for_each_entry(f, &fanout_list, list) { |
| 1319 | if (f->id == id && |
| 1320 | read_pnet(&f->net) == sock_net(sk)) { |
| 1321 | match = f; |
| 1322 | break; |
| 1323 | } |
| 1324 | } |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1325 | err = -EINVAL; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1326 | if (match && match->flags != flags) |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1327 | goto out; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1328 | if (!match) { |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1329 | err = -ENOMEM; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1330 | match = kzalloc(sizeof(*match), GFP_KERNEL); |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1331 | if (!match) |
| 1332 | goto out; |
| 1333 | write_pnet(&match->net, sock_net(sk)); |
| 1334 | match->id = id; |
| 1335 | match->type = type; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1336 | match->flags = flags; |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1337 | atomic_set(&match->rr_cur, 0); |
| 1338 | INIT_LIST_HEAD(&match->list); |
| 1339 | spin_lock_init(&match->lock); |
| 1340 | atomic_set(&match->sk_ref, 0); |
| 1341 | match->prot_hook.type = po->prot_hook.type; |
| 1342 | match->prot_hook.dev = po->prot_hook.dev; |
| 1343 | match->prot_hook.func = packet_rcv_fanout; |
| 1344 | match->prot_hook.af_packet_priv = match; |
Eric Leblond | c0de08d | 2012-08-16 22:02:58 +0000 | [diff] [blame] | 1345 | match->prot_hook.id_match = match_fanout_group; |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1346 | dev_add_pack(&match->prot_hook); |
| 1347 | list_add(&match->list, &fanout_list); |
| 1348 | } |
| 1349 | err = -EINVAL; |
| 1350 | if (match->type == type && |
| 1351 | match->prot_hook.type == po->prot_hook.type && |
| 1352 | match->prot_hook.dev == po->prot_hook.dev) { |
| 1353 | err = -ENOSPC; |
| 1354 | if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) { |
| 1355 | __dev_remove_pack(&po->prot_hook); |
| 1356 | po->fanout = match; |
| 1357 | atomic_inc(&match->sk_ref); |
| 1358 | __fanout_link(sk, po); |
| 1359 | err = 0; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1360 | } |
| 1361 | } |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1362 | out: |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1363 | mutex_unlock(&fanout_mutex); |
| 1364 | return err; |
| 1365 | } |
| 1366 | |
| 1367 | static void fanout_release(struct sock *sk) |
| 1368 | { |
| 1369 | struct packet_sock *po = pkt_sk(sk); |
| 1370 | struct packet_fanout *f; |
| 1371 | |
| 1372 | f = po->fanout; |
| 1373 | if (!f) |
| 1374 | return; |
| 1375 | |
Pavel Emelyanov | fff3321 | 2012-08-16 05:36:48 +0000 | [diff] [blame] | 1376 | mutex_lock(&fanout_mutex); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1377 | po->fanout = NULL; |
| 1378 | |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1379 | if (atomic_dec_and_test(&f->sk_ref)) { |
| 1380 | list_del(&f->list); |
| 1381 | dev_remove_pack(&f->prot_hook); |
| 1382 | kfree(f); |
| 1383 | } |
| 1384 | mutex_unlock(&fanout_mutex); |
| 1385 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 1387 | static const struct proto_ops packet_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 1389 | static const struct proto_ops packet_ops_spkt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1391 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
| 1392 | struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | { |
| 1394 | struct sock *sk; |
| 1395 | struct sockaddr_pkt *spkt; |
| 1396 | |
| 1397 | /* |
| 1398 | * When we registered the protocol we saved the socket in the data |
| 1399 | * field for just this event. |
| 1400 | */ |
| 1401 | |
| 1402 | sk = pt->af_packet_priv; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1403 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | /* |
| 1405 | * Yank back the headers [hope the device set this |
| 1406 | * right or kerboom...] |
| 1407 | * |
| 1408 | * Incoming packets have ll header pulled, |
| 1409 | * push it back. |
| 1410 | * |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1411 | * For outgoing ones skb->data == skb_mac_header(skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | * so that this procedure is noop. |
| 1413 | */ |
| 1414 | |
| 1415 | if (skb->pkt_type == PACKET_LOOPBACK) |
| 1416 | goto out; |
| 1417 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 1418 | if (!net_eq(dev_net(dev), sock_net(sk))) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 1419 | goto out; |
| 1420 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1421 | skb = skb_share_check(skb, GFP_ATOMIC); |
| 1422 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | goto oom; |
| 1424 | |
| 1425 | /* drop any routing info */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1426 | skb_dst_drop(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | |
Phil Oester | 84531c2 | 2005-07-12 11:57:52 -0700 | [diff] [blame] | 1428 | /* drop conntrack reference */ |
| 1429 | nf_reset(skb); |
| 1430 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 1431 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1433 | skb_push(skb, skb->data - skb_mac_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | |
| 1435 | /* |
| 1436 | * The SOCK_PACKET socket receives _all_ frames. |
| 1437 | */ |
| 1438 | |
| 1439 | spkt->spkt_family = dev->type; |
| 1440 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); |
| 1441 | spkt->spkt_protocol = skb->protocol; |
| 1442 | |
| 1443 | /* |
| 1444 | * Charge the memory to the socket. This is done specifically |
| 1445 | * to prevent sockets using all the memory up. |
| 1446 | */ |
| 1447 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1448 | if (sock_queue_rcv_skb(sk, skb) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | return 0; |
| 1450 | |
| 1451 | out: |
| 1452 | kfree_skb(skb); |
| 1453 | oom: |
| 1454 | return 0; |
| 1455 | } |
| 1456 | |
| 1457 | |
| 1458 | /* |
| 1459 | * Output a raw packet to a device layer. This bypasses all the other |
| 1460 | * protocol layers and you must therefore supply it with a complete frame |
| 1461 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, |
| 1464 | struct msghdr *msg, size_t len) |
| 1465 | { |
| 1466 | struct sock *sk = sock->sk; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1467 | struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name; |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1468 | struct sk_buff *skb = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | struct net_device *dev; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1470 | __be16 proto = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | int err; |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 1472 | int extra_len = 0; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1473 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1475 | * Get and verify the address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | */ |
| 1477 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1478 | if (saddr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1480 | return -EINVAL; |
| 1481 | if (msg->msg_namelen == sizeof(struct sockaddr_pkt)) |
| 1482 | proto = saddr->spkt_protocol; |
| 1483 | } else |
| 1484 | return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | |
| 1486 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1487 | * Find the device first to size check it |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | */ |
| 1489 | |
danborkmann@iogearbox.net | de74e92 | 2012-06-10 08:59:28 +0000 | [diff] [blame] | 1490 | saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0; |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1491 | retry: |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 1492 | rcu_read_lock(); |
| 1493 | dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | err = -ENODEV; |
| 1495 | if (dev == NULL) |
| 1496 | goto out_unlock; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1497 | |
David S. Miller | d5e76b0 | 2007-01-25 19:30:36 -0800 | [diff] [blame] | 1498 | err = -ENETDOWN; |
| 1499 | if (!(dev->flags & IFF_UP)) |
| 1500 | goto out_unlock; |
| 1501 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | /* |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1503 | * You may not queue a frame bigger than the mtu. This is the lowest level |
| 1504 | * raw protocol and you must do your own fragmentation at this level. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1506 | |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 1507 | if (unlikely(sock_flag(sk, SOCK_NOFCS))) { |
| 1508 | if (!netif_supports_nofcs(dev)) { |
| 1509 | err = -EPROTONOSUPPORT; |
| 1510 | goto out_unlock; |
| 1511 | } |
| 1512 | extra_len = 4; /* We're doing our own CRC */ |
| 1513 | } |
| 1514 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | err = -EMSGSIZE; |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 1516 | if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | goto out_unlock; |
| 1518 | |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1519 | if (!skb) { |
| 1520 | size_t reserved = LL_RESERVED_SPACE(dev); |
Herbert Xu | 4ce4091 | 2011-11-18 02:20:05 +0000 | [diff] [blame] | 1521 | int tlen = dev->needed_tailroom; |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1522 | unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1524 | rcu_read_unlock(); |
Herbert Xu | 4ce4091 | 2011-11-18 02:20:05 +0000 | [diff] [blame] | 1525 | skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL); |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1526 | if (skb == NULL) |
| 1527 | return -ENOBUFS; |
| 1528 | /* FIXME: Save some space for broken drivers that write a hard |
| 1529 | * header at transmission time by themselves. PPP is the notable |
| 1530 | * one here. This should really be fixed at the driver level. |
| 1531 | */ |
| 1532 | skb_reserve(skb, reserved); |
| 1533 | skb_reset_network_header(skb); |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1534 | |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1535 | /* Try to align data part correctly */ |
| 1536 | if (hhlen) { |
| 1537 | skb->data -= hhlen; |
| 1538 | skb->tail -= hhlen; |
| 1539 | if (len < hhlen) |
| 1540 | skb_reset_network_header(skb); |
| 1541 | } |
| 1542 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
| 1543 | if (err) |
| 1544 | goto out_free; |
| 1545 | goto retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1546 | } |
| 1547 | |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 1548 | if (len > (dev->mtu + dev->hard_header_len + extra_len)) { |
Ben Greear | 57f89bf | 2011-02-11 09:35:18 +0000 | [diff] [blame] | 1549 | /* Earlier code assumed this would be a VLAN pkt, |
| 1550 | * double-check this now that we have the actual |
| 1551 | * packet in hand. |
| 1552 | */ |
| 1553 | struct ethhdr *ehdr; |
| 1554 | skb_reset_mac_header(skb); |
| 1555 | ehdr = eth_hdr(skb); |
| 1556 | if (ehdr->h_proto != htons(ETH_P_8021Q)) { |
| 1557 | err = -EMSGSIZE; |
| 1558 | goto out_unlock; |
| 1559 | } |
| 1560 | } |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1561 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | skb->protocol = proto; |
| 1563 | skb->dev = dev; |
| 1564 | skb->priority = sk->sk_priority; |
Eric Dumazet | 2d37a18 | 2009-10-01 19:14:46 +0000 | [diff] [blame] | 1565 | skb->mark = sk->sk_mark; |
Daniel Borkmann | bf84a01 | 2013-04-14 08:08:13 +0000 | [diff] [blame] | 1566 | |
| 1567 | sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 1569 | if (unlikely(extra_len == 4)) |
| 1570 | skb->no_fcs = 1; |
| 1571 | |
Jason Wang | 40893fd | 2013-03-26 23:11:22 +0000 | [diff] [blame] | 1572 | skb_probe_transport_header(skb, 0); |
Jason Wang | c1aad27 | 2013-03-25 20:19:57 +0000 | [diff] [blame] | 1573 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | dev_queue_xmit(skb); |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 1575 | rcu_read_unlock(); |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1576 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | out_unlock: |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 1579 | rcu_read_unlock(); |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1580 | out_free: |
| 1581 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | return err; |
| 1583 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1585 | static unsigned int run_filter(const struct sk_buff *skb, |
Eric Dumazet | 62ab081 | 2010-12-06 20:50:09 +0000 | [diff] [blame] | 1586 | const struct sock *sk, |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1587 | unsigned int res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | { |
| 1589 | struct sk_filter *filter; |
| 1590 | |
Eric Dumazet | 80f8f10 | 2011-01-18 07:46:52 +0000 | [diff] [blame] | 1591 | rcu_read_lock(); |
| 1592 | filter = rcu_dereference(sk->sk_filter); |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1593 | if (filter != NULL) |
Eric Dumazet | 0a14842 | 2011-04-20 09:27:32 +0000 | [diff] [blame] | 1594 | res = SK_RUN_FILTER(filter, skb); |
Eric Dumazet | 80f8f10 | 2011-01-18 07:46:52 +0000 | [diff] [blame] | 1595 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1597 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1598 | } |
| 1599 | |
| 1600 | /* |
Eric Dumazet | 62ab081 | 2010-12-06 20:50:09 +0000 | [diff] [blame] | 1601 | * This function makes lazy skb cloning in hope that most of packets |
| 1602 | * are discarded by BPF. |
| 1603 | * |
| 1604 | * Note tricky part: we DO mangle shared skb! skb->data, skb->len |
| 1605 | * and skb->cb are mangled. It works because (and until) packets |
| 1606 | * falling here are owned by current CPU. Output packets are cloned |
| 1607 | * by dev_queue_xmit_nit(), input packets are processed by net_bh |
| 1608 | * sequencially, so that if we return skb to original state on exit, |
| 1609 | * we will not harm anyone. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | */ |
| 1611 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1612 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
| 1613 | struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | { |
| 1615 | struct sock *sk; |
| 1616 | struct sockaddr_ll *sll; |
| 1617 | struct packet_sock *po; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1618 | u8 *skb_head = skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1619 | int skb_len = skb->len; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1620 | unsigned int snaplen, res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1621 | |
| 1622 | if (skb->pkt_type == PACKET_LOOPBACK) |
| 1623 | goto drop; |
| 1624 | |
| 1625 | sk = pt->af_packet_priv; |
| 1626 | po = pkt_sk(sk); |
| 1627 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 1628 | if (!net_eq(dev_net(dev), sock_net(sk))) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 1629 | goto drop; |
| 1630 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | skb->dev = dev; |
| 1632 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1633 | if (dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | /* The device has an explicit notion of ll header, |
Eric Dumazet | 62ab081 | 2010-12-06 20:50:09 +0000 | [diff] [blame] | 1635 | * exported to higher levels. |
| 1636 | * |
| 1637 | * Otherwise, the device hides details of its frame |
| 1638 | * structure, so that corresponding packet head is |
| 1639 | * never delivered to user. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | */ |
| 1641 | if (sk->sk_type != SOCK_DGRAM) |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1642 | skb_push(skb, skb->data - skb_mac_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | else if (skb->pkt_type == PACKET_OUTGOING) { |
| 1644 | /* Special case: outgoing packets have ll header at head */ |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1645 | skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | } |
| 1647 | } |
| 1648 | |
| 1649 | snaplen = skb->len; |
| 1650 | |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1651 | res = run_filter(skb, sk, snaplen); |
| 1652 | if (!res) |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 1653 | goto drop_n_restore; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1654 | if (snaplen > res) |
| 1655 | snaplen = res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | |
Eric Dumazet | 0fd7bac | 2011-12-21 07:11:44 +0000 | [diff] [blame] | 1657 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1658 | goto drop_n_acct; |
| 1659 | |
| 1660 | if (skb_shared(skb)) { |
| 1661 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); |
| 1662 | if (nskb == NULL) |
| 1663 | goto drop_n_acct; |
| 1664 | |
| 1665 | if (skb_head != skb->data) { |
| 1666 | skb->data = skb_head; |
| 1667 | skb->len = skb_len; |
| 1668 | } |
Eric Dumazet | abc4e4f | 2012-04-19 02:24:42 +0000 | [diff] [blame] | 1669 | consume_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | skb = nskb; |
| 1671 | } |
| 1672 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 1673 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
| 1674 | sizeof(skb->cb)); |
| 1675 | |
| 1676 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | sll->sll_family = AF_PACKET; |
| 1678 | sll->sll_hatype = dev->type; |
| 1679 | sll->sll_protocol = skb->protocol; |
| 1680 | sll->sll_pkttype = skb->pkt_type; |
Peter P Waskiewicz Jr | 8032b46 | 2007-11-10 22:03:25 -0800 | [diff] [blame] | 1681 | if (unlikely(po->origdev)) |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 1682 | sll->sll_ifindex = orig_dev->ifindex; |
| 1683 | else |
| 1684 | sll->sll_ifindex = dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1685 | |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 1686 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1687 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 1688 | PACKET_SKB_CB(skb)->origlen = skb->len; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1689 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | if (pskb_trim(skb, snaplen)) |
| 1691 | goto drop_n_acct; |
| 1692 | |
| 1693 | skb_set_owner_r(skb, sk); |
| 1694 | skb->dev = NULL; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1695 | skb_dst_drop(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | |
Phil Oester | 84531c2 | 2005-07-12 11:57:52 -0700 | [diff] [blame] | 1697 | /* drop conntrack reference */ |
| 1698 | nf_reset(skb); |
| 1699 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1700 | spin_lock(&sk->sk_receive_queue.lock); |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 1701 | po->stats.stats1.tp_packets++; |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 1702 | skb->dropcount = atomic_read(&sk->sk_drops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
| 1704 | spin_unlock(&sk->sk_receive_queue.lock); |
| 1705 | sk->sk_data_ready(sk, skb->len); |
| 1706 | return 0; |
| 1707 | |
| 1708 | drop_n_acct: |
Willem de Bruijn | 7091fbd | 2011-09-30 10:38:28 +0000 | [diff] [blame] | 1709 | spin_lock(&sk->sk_receive_queue.lock); |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 1710 | po->stats.stats1.tp_drops++; |
Willem de Bruijn | 7091fbd | 2011-09-30 10:38:28 +0000 | [diff] [blame] | 1711 | atomic_inc(&sk->sk_drops); |
| 1712 | spin_unlock(&sk->sk_receive_queue.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | |
| 1714 | drop_n_restore: |
| 1715 | if (skb_head != skb->data && skb_shared(skb)) { |
| 1716 | skb->data = skb_head; |
| 1717 | skb->len = skb_len; |
| 1718 | } |
| 1719 | drop: |
Neil Horman | ead2ceb | 2009-03-11 09:49:55 +0000 | [diff] [blame] | 1720 | consume_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1721 | return 0; |
| 1722 | } |
| 1723 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1724 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
| 1725 | struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1726 | { |
| 1727 | struct sock *sk; |
| 1728 | struct packet_sock *po; |
| 1729 | struct sockaddr_ll *sll; |
Daniel Borkmann | 184f489 | 2013-04-16 01:57:46 +0000 | [diff] [blame] | 1730 | union tpacket_uhdr h; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1731 | u8 *skb_head = skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | int skb_len = skb->len; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1733 | unsigned int snaplen, res; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1734 | unsigned long status = TP_STATUS_USER; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1735 | unsigned short macoff, netoff, hdrlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | struct sk_buff *copy_skb = NULL; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1737 | struct timespec ts; |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 1738 | __u32 ts_status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | |
| 1740 | if (skb->pkt_type == PACKET_LOOPBACK) |
| 1741 | goto drop; |
| 1742 | |
| 1743 | sk = pt->af_packet_priv; |
| 1744 | po = pkt_sk(sk); |
| 1745 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 1746 | if (!net_eq(dev_net(dev), sock_net(sk))) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 1747 | goto drop; |
| 1748 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1749 | if (dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1750 | if (sk->sk_type != SOCK_DGRAM) |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1751 | skb_push(skb, skb->data - skb_mac_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1752 | else if (skb->pkt_type == PACKET_OUTGOING) { |
| 1753 | /* Special case: outgoing packets have ll header at head */ |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1754 | skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | } |
| 1756 | } |
| 1757 | |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1758 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
| 1759 | status |= TP_STATUS_CSUMNOTREADY; |
| 1760 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1761 | snaplen = skb->len; |
| 1762 | |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1763 | res = run_filter(skb, sk, snaplen); |
| 1764 | if (!res) |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 1765 | goto drop_n_restore; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1766 | if (snaplen > res) |
| 1767 | snaplen = res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1768 | |
| 1769 | if (sk->sk_type == SOCK_DGRAM) { |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 1770 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
| 1771 | po->tp_reserve; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1772 | } else { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1773 | unsigned int maclen = skb_network_offset(skb); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1774 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 1775 | (maclen < 16 ? 16 : maclen)) + |
| 1776 | po->tp_reserve; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | macoff = netoff - maclen; |
| 1778 | } |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1779 | if (po->tp_version <= TPACKET_V2) { |
| 1780 | if (macoff + snaplen > po->rx_ring.frame_size) { |
| 1781 | if (po->copy_thresh && |
Eric Dumazet | 0fd7bac | 2011-12-21 07:11:44 +0000 | [diff] [blame] | 1782 | atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1783 | if (skb_shared(skb)) { |
| 1784 | copy_skb = skb_clone(skb, GFP_ATOMIC); |
| 1785 | } else { |
| 1786 | copy_skb = skb_get(skb); |
| 1787 | skb_head = skb->data; |
| 1788 | } |
| 1789 | if (copy_skb) |
| 1790 | skb_set_owner_r(copy_skb, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | } |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1792 | snaplen = po->rx_ring.frame_size - macoff; |
| 1793 | if ((int)snaplen < 0) |
| 1794 | snaplen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1795 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1796 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1797 | spin_lock(&sk->sk_receive_queue.lock); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1798 | h.raw = packet_current_rx_frame(po, skb, |
| 1799 | TP_STATUS_KERNEL, (macoff+snaplen)); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1800 | if (!h.raw) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1801 | goto ring_is_full; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1802 | if (po->tp_version <= TPACKET_V2) { |
| 1803 | packet_increment_rx_head(po, &po->rx_ring); |
| 1804 | /* |
| 1805 | * LOSING will be reported till you read the stats, |
| 1806 | * because it's COR - Clear On Read. |
| 1807 | * Anyways, moving it for V1/V2 only as V3 doesn't need this |
| 1808 | * at packet level. |
| 1809 | */ |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 1810 | if (po->stats.stats1.tp_drops) |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1811 | status |= TP_STATUS_LOSING; |
| 1812 | } |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 1813 | po->stats.stats1.tp_packets++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | if (copy_skb) { |
| 1815 | status |= TP_STATUS_COPY; |
| 1816 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); |
| 1817 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1818 | spin_unlock(&sk->sk_receive_queue.lock); |
| 1819 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1820 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 1821 | |
| 1822 | if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp))) |
Daniel Borkmann | 7a51384 | 2013-04-23 00:39:29 +0000 | [diff] [blame] | 1823 | getnstimeofday(&ts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 1825 | status |= ts_status; |
| 1826 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1827 | switch (po->tp_version) { |
| 1828 | case TPACKET_V1: |
| 1829 | h.h1->tp_len = skb->len; |
| 1830 | h.h1->tp_snaplen = snaplen; |
| 1831 | h.h1->tp_mac = macoff; |
| 1832 | h.h1->tp_net = netoff; |
Daniel Borkmann | 4b457bd | 2013-04-16 01:29:11 +0000 | [diff] [blame] | 1833 | h.h1->tp_sec = ts.tv_sec; |
| 1834 | h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1835 | hdrlen = sizeof(*h.h1); |
| 1836 | break; |
| 1837 | case TPACKET_V2: |
| 1838 | h.h2->tp_len = skb->len; |
| 1839 | h.h2->tp_snaplen = snaplen; |
| 1840 | h.h2->tp_mac = macoff; |
| 1841 | h.h2->tp_net = netoff; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1842 | h.h2->tp_sec = ts.tv_sec; |
| 1843 | h.h2->tp_nsec = ts.tv_nsec; |
Ben Greear | a3bcc23 | 2011-06-01 06:49:10 +0000 | [diff] [blame] | 1844 | if (vlan_tx_tag_present(skb)) { |
| 1845 | h.h2->tp_vlan_tci = vlan_tx_tag_get(skb); |
| 1846 | status |= TP_STATUS_VLAN_VALID; |
| 1847 | } else { |
| 1848 | h.h2->tp_vlan_tci = 0; |
| 1849 | } |
Eric Dumazet | 13fcb7b | 2011-06-06 22:42:06 -0700 | [diff] [blame] | 1850 | h.h2->tp_padding = 0; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1851 | hdrlen = sizeof(*h.h2); |
| 1852 | break; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1853 | case TPACKET_V3: |
| 1854 | /* tp_nxt_offset,vlan are already populated above. |
| 1855 | * So DONT clear those fields here |
| 1856 | */ |
| 1857 | h.h3->tp_status |= status; |
| 1858 | h.h3->tp_len = skb->len; |
| 1859 | h.h3->tp_snaplen = snaplen; |
| 1860 | h.h3->tp_mac = macoff; |
| 1861 | h.h3->tp_net = netoff; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1862 | h.h3->tp_sec = ts.tv_sec; |
| 1863 | h.h3->tp_nsec = ts.tv_nsec; |
| 1864 | hdrlen = sizeof(*h.h3); |
| 1865 | break; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1866 | default: |
| 1867 | BUG(); |
| 1868 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1870 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 1871 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | sll->sll_family = AF_PACKET; |
| 1873 | sll->sll_hatype = dev->type; |
| 1874 | sll->sll_protocol = skb->protocol; |
| 1875 | sll->sll_pkttype = skb->pkt_type; |
Peter P Waskiewicz Jr | 8032b46 | 2007-11-10 22:03:25 -0800 | [diff] [blame] | 1876 | if (unlikely(po->origdev)) |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 1877 | sll->sll_ifindex = orig_dev->ifindex; |
| 1878 | else |
| 1879 | sll->sll_ifindex = dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1880 | |
Ralf Baechle | e16aa20 | 2006-12-07 00:11:33 -0800 | [diff] [blame] | 1881 | smp_mb(); |
Changli Gao | f6dafa9 | 2010-12-07 04:26:16 +0000 | [diff] [blame] | 1882 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1883 | { |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 1884 | u8 *start, *end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1886 | if (po->tp_version <= TPACKET_V2) { |
| 1887 | end = (u8 *)PAGE_ALIGN((unsigned long)h.raw |
| 1888 | + macoff + snaplen); |
| 1889 | for (start = h.raw; start < end; start += PAGE_SIZE) |
| 1890 | flush_dcache_page(pgv_to_page(start)); |
| 1891 | } |
Chetan Loke | cc9f01b | 2011-07-14 08:36:33 -0700 | [diff] [blame] | 1892 | smp_wmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1893 | } |
Changli Gao | f6dafa9 | 2010-12-07 04:26:16 +0000 | [diff] [blame] | 1894 | #endif |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1895 | if (po->tp_version <= TPACKET_V2) |
| 1896 | __packet_set_status(po, h.raw, status); |
| 1897 | else |
| 1898 | prb_clear_blk_fill_status(&po->rx_ring); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1899 | |
| 1900 | sk->sk_data_ready(sk, 0); |
| 1901 | |
| 1902 | drop_n_restore: |
| 1903 | if (skb_head != skb->data && skb_shared(skb)) { |
| 1904 | skb->data = skb_head; |
| 1905 | skb->len = skb_len; |
| 1906 | } |
| 1907 | drop: |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1908 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1909 | return 0; |
| 1910 | |
| 1911 | ring_is_full: |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 1912 | po->stats.stats1.tp_drops++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | spin_unlock(&sk->sk_receive_queue.lock); |
| 1914 | |
| 1915 | sk->sk_data_ready(sk, 0); |
Wei Yongjun | acb5d75 | 2009-02-25 00:36:42 +0000 | [diff] [blame] | 1916 | kfree_skb(copy_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1917 | goto drop_n_restore; |
| 1918 | } |
| 1919 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1920 | static void tpacket_destruct_skb(struct sk_buff *skb) |
| 1921 | { |
| 1922 | struct packet_sock *po = pkt_sk(skb->sk); |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1923 | void *ph; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1924 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1925 | if (likely(po->tx_ring.pg_vec)) { |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 1926 | __u32 ts; |
| 1927 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1928 | ph = skb_shinfo(skb)->destructor_arg; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1929 | BUG_ON(atomic_read(&po->tx_ring.pending) == 0); |
| 1930 | atomic_dec(&po->tx_ring.pending); |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 1931 | |
| 1932 | ts = __packet_set_timestamp(po, ph, skb); |
| 1933 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1934 | } |
| 1935 | |
| 1936 | sock_wfree(skb); |
| 1937 | } |
| 1938 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1939 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
| 1940 | void *frame, struct net_device *dev, int size_max, |
Herbert Xu | ae64194 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 1941 | __be16 proto, unsigned char *addr, int hlen) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1942 | { |
Daniel Borkmann | 184f489 | 2013-04-16 01:57:46 +0000 | [diff] [blame] | 1943 | union tpacket_uhdr ph; |
David S. Miller | 09effa6 | 2013-08-07 17:11:00 -0700 | [diff] [blame] | 1944 | int to_write, offset, len, tp_len, nr_frags, len_max; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1945 | struct socket *sock = po->sk.sk_socket; |
| 1946 | struct page *page; |
| 1947 | void *data; |
| 1948 | int err; |
| 1949 | |
| 1950 | ph.raw = frame; |
| 1951 | |
| 1952 | skb->protocol = proto; |
| 1953 | skb->dev = dev; |
| 1954 | skb->priority = po->sk.sk_priority; |
Eric Dumazet | 2d37a18 | 2009-10-01 19:14:46 +0000 | [diff] [blame] | 1955 | skb->mark = po->sk.sk_mark; |
Willem de Bruijn | 2e31396 | 2013-04-23 00:39:28 +0000 | [diff] [blame] | 1956 | sock_tx_timestamp(&po->sk, &skb_shinfo(skb)->tx_flags); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1957 | skb_shinfo(skb)->destructor_arg = ph.raw; |
| 1958 | |
| 1959 | switch (po->tp_version) { |
| 1960 | case TPACKET_V2: |
| 1961 | tp_len = ph.h2->tp_len; |
| 1962 | break; |
| 1963 | default: |
| 1964 | tp_len = ph.h1->tp_len; |
| 1965 | break; |
| 1966 | } |
David S. Miller | 09effa6 | 2013-08-07 17:11:00 -0700 | [diff] [blame] | 1967 | if (unlikely(tp_len > size_max)) { |
| 1968 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); |
| 1969 | return -EMSGSIZE; |
| 1970 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1971 | |
Herbert Xu | ae64194 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 1972 | skb_reserve(skb, hlen); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1973 | skb_reset_network_header(skb); |
Jason Wang | 40893fd | 2013-03-26 23:11:22 +0000 | [diff] [blame] | 1974 | skb_probe_transport_header(skb, 0); |
Jason Wang | c1aad27 | 2013-03-25 20:19:57 +0000 | [diff] [blame] | 1975 | |
Paul Chavent | 5920cd3a | 2012-11-06 23:10:47 +0000 | [diff] [blame] | 1976 | if (po->tp_tx_has_off) { |
| 1977 | int off_min, off_max, off; |
| 1978 | off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll); |
| 1979 | off_max = po->tx_ring.frame_size - tp_len; |
| 1980 | if (sock->type == SOCK_DGRAM) { |
| 1981 | switch (po->tp_version) { |
| 1982 | case TPACKET_V2: |
| 1983 | off = ph.h2->tp_net; |
| 1984 | break; |
| 1985 | default: |
| 1986 | off = ph.h1->tp_net; |
| 1987 | break; |
| 1988 | } |
| 1989 | } else { |
| 1990 | switch (po->tp_version) { |
| 1991 | case TPACKET_V2: |
| 1992 | off = ph.h2->tp_mac; |
| 1993 | break; |
| 1994 | default: |
| 1995 | off = ph.h1->tp_mac; |
| 1996 | break; |
| 1997 | } |
| 1998 | } |
| 1999 | if (unlikely((off < off_min) || (off_max < off))) |
| 2000 | return -EINVAL; |
| 2001 | data = ph.raw + off; |
| 2002 | } else { |
| 2003 | data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll); |
| 2004 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2005 | to_write = tp_len; |
| 2006 | |
| 2007 | if (sock->type == SOCK_DGRAM) { |
| 2008 | err = dev_hard_header(skb, dev, ntohs(proto), addr, |
| 2009 | NULL, tp_len); |
| 2010 | if (unlikely(err < 0)) |
| 2011 | return -EINVAL; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2012 | } else if (dev->hard_header_len) { |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2013 | /* net device doesn't like empty head */ |
| 2014 | if (unlikely(tp_len <= dev->hard_header_len)) { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2015 | pr_err("packet size is too short (%d < %d)\n", |
| 2016 | tp_len, dev->hard_header_len); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2017 | return -EINVAL; |
| 2018 | } |
| 2019 | |
| 2020 | skb_push(skb, dev->hard_header_len); |
| 2021 | err = skb_store_bits(skb, 0, data, |
| 2022 | dev->hard_header_len); |
| 2023 | if (unlikely(err)) |
| 2024 | return err; |
| 2025 | |
| 2026 | data += dev->hard_header_len; |
| 2027 | to_write -= dev->hard_header_len; |
| 2028 | } |
| 2029 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2030 | offset = offset_in_page(data); |
| 2031 | len_max = PAGE_SIZE - offset; |
| 2032 | len = ((to_write > len_max) ? len_max : to_write); |
| 2033 | |
| 2034 | skb->data_len = to_write; |
| 2035 | skb->len += to_write; |
| 2036 | skb->truesize += to_write; |
| 2037 | atomic_add(to_write, &po->sk.sk_wmem_alloc); |
| 2038 | |
| 2039 | while (likely(to_write)) { |
| 2040 | nr_frags = skb_shinfo(skb)->nr_frags; |
| 2041 | |
| 2042 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2043 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
| 2044 | MAX_SKB_FRAGS); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2045 | return -EFAULT; |
| 2046 | } |
| 2047 | |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 2048 | page = pgv_to_page(data); |
| 2049 | data += len; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2050 | flush_dcache_page(page); |
| 2051 | get_page(page); |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 2052 | skb_fill_page_desc(skb, nr_frags, page, offset, len); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2053 | to_write -= len; |
| 2054 | offset = 0; |
| 2055 | len_max = PAGE_SIZE; |
| 2056 | len = ((to_write > len_max) ? len_max : to_write); |
| 2057 | } |
| 2058 | |
| 2059 | return tp_len; |
| 2060 | } |
| 2061 | |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2062 | static struct net_device *packet_cached_dev_get(struct packet_sock *po) |
| 2063 | { |
| 2064 | struct net_device *dev; |
| 2065 | |
| 2066 | rcu_read_lock(); |
| 2067 | dev = rcu_dereference(po->cached_dev); |
| 2068 | if (dev) |
| 2069 | dev_hold(dev); |
| 2070 | rcu_read_unlock(); |
| 2071 | |
| 2072 | return dev; |
| 2073 | } |
| 2074 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2075 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) |
| 2076 | { |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2077 | struct sk_buff *skb; |
| 2078 | struct net_device *dev; |
| 2079 | __be16 proto; |
David S. Miller | 09effa6 | 2013-08-07 17:11:00 -0700 | [diff] [blame] | 2080 | int err, reserve = 0; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2081 | void *ph; |
| 2082 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2083 | int tp_len, size_max; |
| 2084 | unsigned char *addr; |
| 2085 | int len_sum = 0; |
danborkmann@iogearbox.net | 9e67030 | 2012-08-20 03:34:03 +0000 | [diff] [blame] | 2086 | int status = TP_STATUS_AVAILABLE; |
Herbert Xu | ae64194 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 2087 | int hlen, tlen; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2088 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2089 | mutex_lock(&po->pg_vec_lock); |
| 2090 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2091 | if (saddr == NULL) { |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2092 | dev = packet_cached_dev_get(po); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2093 | proto = po->num; |
| 2094 | addr = NULL; |
| 2095 | } else { |
| 2096 | err = -EINVAL; |
| 2097 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) |
| 2098 | goto out; |
| 2099 | if (msg->msg_namelen < (saddr->sll_halen |
| 2100 | + offsetof(struct sockaddr_ll, |
| 2101 | sll_addr))) |
| 2102 | goto out; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2103 | proto = saddr->sll_protocol; |
| 2104 | addr = saddr->sll_addr; |
Ben Greear | 827d978 | 2011-06-01 07:18:53 +0000 | [diff] [blame] | 2105 | dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2106 | } |
| 2107 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2108 | err = -ENXIO; |
| 2109 | if (unlikely(dev == NULL)) |
| 2110 | goto out; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2111 | err = -ENETDOWN; |
| 2112 | if (unlikely(!(dev->flags & IFF_UP))) |
| 2113 | goto out_put; |
| 2114 | |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2115 | reserve = dev->hard_header_len; |
| 2116 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2117 | size_max = po->tx_ring.frame_size |
Gabor Gombas | b5dd884 | 2009-10-29 03:19:11 -0700 | [diff] [blame] | 2118 | - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2119 | |
David S. Miller | 09effa6 | 2013-08-07 17:11:00 -0700 | [diff] [blame] | 2120 | if (size_max > dev->mtu + reserve) |
| 2121 | size_max = dev->mtu + reserve; |
| 2122 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2123 | do { |
| 2124 | ph = packet_current_frame(po, &po->tx_ring, |
| 2125 | TP_STATUS_SEND_REQUEST); |
| 2126 | |
| 2127 | if (unlikely(ph == NULL)) { |
| 2128 | schedule(); |
| 2129 | continue; |
| 2130 | } |
| 2131 | |
| 2132 | status = TP_STATUS_SEND_REQUEST; |
Herbert Xu | ae64194 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 2133 | hlen = LL_RESERVED_SPACE(dev); |
| 2134 | tlen = dev->needed_tailroom; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2135 | skb = sock_alloc_send_skb(&po->sk, |
Herbert Xu | ae64194 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 2136 | hlen + tlen + sizeof(struct sockaddr_ll), |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2137 | 0, &err); |
| 2138 | |
| 2139 | if (unlikely(skb == NULL)) |
| 2140 | goto out_status; |
| 2141 | |
| 2142 | tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto, |
Herbert Xu | ae64194 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 2143 | addr, hlen); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2144 | |
| 2145 | if (unlikely(tp_len < 0)) { |
| 2146 | if (po->tp_loss) { |
| 2147 | __packet_set_status(po, ph, |
| 2148 | TP_STATUS_AVAILABLE); |
| 2149 | packet_increment_head(&po->tx_ring); |
| 2150 | kfree_skb(skb); |
| 2151 | continue; |
| 2152 | } else { |
| 2153 | status = TP_STATUS_WRONG_FORMAT; |
| 2154 | err = tp_len; |
| 2155 | goto out_status; |
| 2156 | } |
| 2157 | } |
| 2158 | |
| 2159 | skb->destructor = tpacket_destruct_skb; |
| 2160 | __packet_set_status(po, ph, TP_STATUS_SENDING); |
| 2161 | atomic_inc(&po->tx_ring.pending); |
| 2162 | |
| 2163 | status = TP_STATUS_SEND_REQUEST; |
| 2164 | err = dev_queue_xmit(skb); |
Jarek Poplawski | eb70df1 | 2010-01-10 22:04:19 +0000 | [diff] [blame] | 2165 | if (unlikely(err > 0)) { |
| 2166 | err = net_xmit_errno(err); |
| 2167 | if (err && __packet_get_status(po, ph) == |
| 2168 | TP_STATUS_AVAILABLE) { |
| 2169 | /* skb was destructed already */ |
| 2170 | skb = NULL; |
| 2171 | goto out_status; |
| 2172 | } |
| 2173 | /* |
| 2174 | * skb was dropped but not destructed yet; |
| 2175 | * let's treat it like congestion or err < 0 |
| 2176 | */ |
| 2177 | err = 0; |
| 2178 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2179 | packet_increment_head(&po->tx_ring); |
| 2180 | len_sum += tp_len; |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 2181 | } while (likely((ph != NULL) || |
| 2182 | ((!(msg->msg_flags & MSG_DONTWAIT)) && |
| 2183 | (atomic_read(&po->tx_ring.pending)))) |
| 2184 | ); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2185 | |
| 2186 | err = len_sum; |
| 2187 | goto out_put; |
| 2188 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2189 | out_status: |
| 2190 | __packet_set_status(po, ph, status); |
| 2191 | kfree_skb(skb); |
| 2192 | out_put: |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2193 | dev_put(dev); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2194 | out: |
| 2195 | mutex_unlock(&po->pg_vec_lock); |
| 2196 | return err; |
| 2197 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2198 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 2199 | static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad, |
| 2200 | size_t reserve, size_t len, |
| 2201 | size_t linear, int noblock, |
| 2202 | int *err) |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2203 | { |
| 2204 | struct sk_buff *skb; |
| 2205 | |
| 2206 | /* Under a page? Don't bother with paged skb. */ |
| 2207 | if (prepad + len < PAGE_SIZE || !linear) |
| 2208 | linear = len; |
| 2209 | |
| 2210 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
Eric Dumazet | 28d6427 | 2013-08-08 14:38:47 -0700 | [diff] [blame] | 2211 | err, 0); |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2212 | if (!skb) |
| 2213 | return NULL; |
| 2214 | |
| 2215 | skb_reserve(skb, reserve); |
| 2216 | skb_put(skb, linear); |
| 2217 | skb->data_len = len - linear; |
| 2218 | skb->len += len - linear; |
| 2219 | |
| 2220 | return skb; |
| 2221 | } |
| 2222 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2223 | static int packet_snd(struct socket *sock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2224 | struct msghdr *msg, size_t len) |
| 2225 | { |
| 2226 | struct sock *sk = sock->sk; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2227 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2228 | struct sk_buff *skb; |
| 2229 | struct net_device *dev; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 2230 | __be16 proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2231 | unsigned char *addr; |
Ben Greear | 827d978 | 2011-06-01 07:18:53 +0000 | [diff] [blame] | 2232 | int err, reserve = 0; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2233 | struct virtio_net_hdr vnet_hdr = { 0 }; |
| 2234 | int offset = 0; |
| 2235 | int vnet_hdr_len; |
| 2236 | struct packet_sock *po = pkt_sk(sk); |
| 2237 | unsigned short gso_type = 0; |
Herbert Xu | ae64194 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 2238 | int hlen, tlen; |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 2239 | int extra_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2240 | |
| 2241 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2242 | * Get and verify the address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2243 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2245 | if (saddr == NULL) { |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2246 | dev = packet_cached_dev_get(po); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2247 | proto = po->num; |
| 2248 | addr = NULL; |
| 2249 | } else { |
| 2250 | err = -EINVAL; |
| 2251 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) |
| 2252 | goto out; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 2253 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
| 2254 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2255 | proto = saddr->sll_protocol; |
| 2256 | addr = saddr->sll_addr; |
Ben Greear | 827d978 | 2011-06-01 07:18:53 +0000 | [diff] [blame] | 2257 | dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2258 | } |
| 2259 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2260 | err = -ENXIO; |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2261 | if (unlikely(dev == NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2262 | goto out_unlock; |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2263 | err = -ENETDOWN; |
| 2264 | if (unlikely(!(dev->flags & IFF_UP))) |
| 2265 | goto out_unlock; |
| 2266 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2267 | if (sock->type == SOCK_RAW) |
| 2268 | reserve = dev->hard_header_len; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2269 | if (po->has_vnet_hdr) { |
| 2270 | vnet_hdr_len = sizeof(vnet_hdr); |
| 2271 | |
| 2272 | err = -EINVAL; |
| 2273 | if (len < vnet_hdr_len) |
| 2274 | goto out_unlock; |
| 2275 | |
| 2276 | len -= vnet_hdr_len; |
| 2277 | |
| 2278 | err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov, |
| 2279 | vnet_hdr_len); |
| 2280 | if (err < 0) |
| 2281 | goto out_unlock; |
| 2282 | |
| 2283 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
| 2284 | (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 > |
| 2285 | vnet_hdr.hdr_len)) |
| 2286 | vnet_hdr.hdr_len = vnet_hdr.csum_start + |
| 2287 | vnet_hdr.csum_offset + 2; |
| 2288 | |
| 2289 | err = -EINVAL; |
| 2290 | if (vnet_hdr.hdr_len > len) |
| 2291 | goto out_unlock; |
| 2292 | |
| 2293 | if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
| 2294 | switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
| 2295 | case VIRTIO_NET_HDR_GSO_TCPV4: |
| 2296 | gso_type = SKB_GSO_TCPV4; |
| 2297 | break; |
| 2298 | case VIRTIO_NET_HDR_GSO_TCPV6: |
| 2299 | gso_type = SKB_GSO_TCPV6; |
| 2300 | break; |
| 2301 | case VIRTIO_NET_HDR_GSO_UDP: |
| 2302 | gso_type = SKB_GSO_UDP; |
| 2303 | break; |
| 2304 | default: |
| 2305 | goto out_unlock; |
| 2306 | } |
| 2307 | |
| 2308 | if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
| 2309 | gso_type |= SKB_GSO_TCP_ECN; |
| 2310 | |
| 2311 | if (vnet_hdr.gso_size == 0) |
| 2312 | goto out_unlock; |
| 2313 | |
| 2314 | } |
| 2315 | } |
| 2316 | |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 2317 | if (unlikely(sock_flag(sk, SOCK_NOFCS))) { |
| 2318 | if (!netif_supports_nofcs(dev)) { |
| 2319 | err = -EPROTONOSUPPORT; |
| 2320 | goto out_unlock; |
| 2321 | } |
| 2322 | extra_len = 4; /* We're doing our own CRC */ |
| 2323 | } |
| 2324 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2325 | err = -EMSGSIZE; |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 2326 | if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN + extra_len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2327 | goto out_unlock; |
| 2328 | |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2329 | err = -ENOBUFS; |
Herbert Xu | ae64194 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 2330 | hlen = LL_RESERVED_SPACE(dev); |
| 2331 | tlen = dev->needed_tailroom; |
| 2332 | skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, vnet_hdr.hdr_len, |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2333 | msg->msg_flags & MSG_DONTWAIT, &err); |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2334 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2335 | goto out_unlock; |
| 2336 | |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2337 | skb_set_network_header(skb, reserve); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2338 | |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 2339 | err = -EINVAL; |
| 2340 | if (sock->type == SOCK_DGRAM && |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2341 | (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0) |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 2342 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2343 | |
| 2344 | /* Returns -EFAULT on error */ |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2345 | err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2346 | if (err) |
| 2347 | goto out_free; |
Daniel Borkmann | bf84a01 | 2013-04-14 08:08:13 +0000 | [diff] [blame] | 2348 | |
| 2349 | sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2350 | |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 2351 | if (!gso_type && (len > dev->mtu + reserve + extra_len)) { |
David S. Miller | 09effa6 | 2013-08-07 17:11:00 -0700 | [diff] [blame] | 2352 | /* Earlier code assumed this would be a VLAN pkt, |
| 2353 | * double-check this now that we have the actual |
| 2354 | * packet in hand. |
| 2355 | */ |
| 2356 | struct ethhdr *ehdr; |
| 2357 | skb_reset_mac_header(skb); |
| 2358 | ehdr = eth_hdr(skb); |
| 2359 | if (ehdr->h_proto != htons(ETH_P_8021Q)) { |
| 2360 | err = -EMSGSIZE; |
| 2361 | goto out_free; |
| 2362 | } |
Ben Greear | 57f89bf | 2011-02-11 09:35:18 +0000 | [diff] [blame] | 2363 | } |
| 2364 | |
David S. Miller | 09effa6 | 2013-08-07 17:11:00 -0700 | [diff] [blame] | 2365 | skb->protocol = proto; |
| 2366 | skb->dev = dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2367 | skb->priority = sk->sk_priority; |
Eric Dumazet | 2d37a18 | 2009-10-01 19:14:46 +0000 | [diff] [blame] | 2368 | skb->mark = sk->sk_mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2369 | |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2370 | if (po->has_vnet_hdr) { |
| 2371 | if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
| 2372 | if (!skb_partial_csum_set(skb, vnet_hdr.csum_start, |
| 2373 | vnet_hdr.csum_offset)) { |
| 2374 | err = -EINVAL; |
| 2375 | goto out_free; |
| 2376 | } |
| 2377 | } |
| 2378 | |
| 2379 | skb_shinfo(skb)->gso_size = vnet_hdr.gso_size; |
| 2380 | skb_shinfo(skb)->gso_type = gso_type; |
| 2381 | |
| 2382 | /* Header must be checked, and gso_segs computed. */ |
| 2383 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; |
| 2384 | skb_shinfo(skb)->gso_segs = 0; |
| 2385 | |
| 2386 | len += vnet_hdr_len; |
| 2387 | } |
| 2388 | |
Jason Wang | 40893fd | 2013-03-26 23:11:22 +0000 | [diff] [blame] | 2389 | skb_probe_transport_header(skb, reserve); |
Jason Wang | c1aad27 | 2013-03-25 20:19:57 +0000 | [diff] [blame] | 2390 | |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 2391 | if (unlikely(extra_len == 4)) |
| 2392 | skb->no_fcs = 1; |
| 2393 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2394 | /* |
| 2395 | * Now send it |
| 2396 | */ |
| 2397 | |
| 2398 | err = dev_queue_xmit(skb); |
| 2399 | if (err > 0 && (err = net_xmit_errno(err)) != 0) |
| 2400 | goto out_unlock; |
| 2401 | |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2402 | dev_put(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2403 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2404 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2405 | |
| 2406 | out_free: |
| 2407 | kfree_skb(skb); |
| 2408 | out_unlock: |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2409 | if (dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2410 | dev_put(dev); |
| 2411 | out: |
| 2412 | return err; |
| 2413 | } |
| 2414 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2415 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
| 2416 | struct msghdr *msg, size_t len) |
| 2417 | { |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2418 | struct sock *sk = sock->sk; |
| 2419 | struct packet_sock *po = pkt_sk(sk); |
| 2420 | if (po->tx_ring.pg_vec) |
| 2421 | return tpacket_snd(po, msg); |
| 2422 | else |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2423 | return packet_snd(sock, msg, len); |
| 2424 | } |
| 2425 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2426 | /* |
| 2427 | * Close a PACKET socket. This is fairly simple. We immediately go |
| 2428 | * to 'closed' state and remove our protocol entry in the device list. |
| 2429 | */ |
| 2430 | |
| 2431 | static int packet_release(struct socket *sock) |
| 2432 | { |
| 2433 | struct sock *sk = sock->sk; |
| 2434 | struct packet_sock *po; |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 2435 | struct net *net; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2436 | union tpacket_req_u req_u; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2437 | |
| 2438 | if (!sk) |
| 2439 | return 0; |
| 2440 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2441 | net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2442 | po = pkt_sk(sk); |
| 2443 | |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 2444 | mutex_lock(&net->packet.sklist_lock); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 2445 | sk_del_node_init_rcu(sk); |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 2446 | mutex_unlock(&net->packet.sklist_lock); |
| 2447 | |
| 2448 | preempt_disable(); |
Eric Dumazet | 920de80 | 2008-11-24 00:09:29 -0800 | [diff] [blame] | 2449 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 2450 | preempt_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2451 | |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 2452 | spin_lock(&po->bind_lock); |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 2453 | unregister_prot_hook(sk, false); |
Ben Greear | 160ff18 | 2011-06-01 07:18:52 +0000 | [diff] [blame] | 2454 | if (po->prot_hook.dev) { |
| 2455 | dev_put(po->prot_hook.dev); |
| 2456 | po->prot_hook.dev = NULL; |
| 2457 | } |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 2458 | spin_unlock(&po->bind_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2459 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2460 | packet_flush_mclist(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2461 | |
Phil Sutter | 9665d5d | 2013-02-01 07:21:41 +0000 | [diff] [blame] | 2462 | if (po->rx_ring.pg_vec) { |
| 2463 | memset(&req_u, 0, sizeof(req_u)); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2464 | packet_set_ring(sk, &req_u, 1, 0); |
Phil Sutter | 9665d5d | 2013-02-01 07:21:41 +0000 | [diff] [blame] | 2465 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2466 | |
Phil Sutter | 9665d5d | 2013-02-01 07:21:41 +0000 | [diff] [blame] | 2467 | if (po->tx_ring.pg_vec) { |
| 2468 | memset(&req_u, 0, sizeof(req_u)); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2469 | packet_set_ring(sk, &req_u, 1, 1); |
Phil Sutter | 9665d5d | 2013-02-01 07:21:41 +0000 | [diff] [blame] | 2470 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2471 | |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 2472 | fanout_release(sk); |
| 2473 | |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 2474 | synchronize_net(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2475 | /* |
| 2476 | * Now the socket is dead. No more input will appear. |
| 2477 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2478 | sock_orphan(sk); |
| 2479 | sock->sk = NULL; |
| 2480 | |
| 2481 | /* Purge queues */ |
| 2482 | |
| 2483 | skb_queue_purge(&sk->sk_receive_queue); |
Pavel Emelyanov | 17ab56a | 2007-11-10 21:38:48 -0800 | [diff] [blame] | 2484 | sk_refcnt_debug_release(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2485 | |
| 2486 | sock_put(sk); |
| 2487 | return 0; |
| 2488 | } |
| 2489 | |
| 2490 | /* |
| 2491 | * Attach a packet hook. |
| 2492 | */ |
| 2493 | |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 2494 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2495 | { |
| 2496 | struct packet_sock *po = pkt_sk(sk); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 2497 | |
Wei Yongjun | aef950b | 2011-12-27 22:32:41 -0500 | [diff] [blame] | 2498 | if (po->fanout) { |
| 2499 | if (dev) |
| 2500 | dev_put(dev); |
| 2501 | |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 2502 | return -EINVAL; |
Wei Yongjun | aef950b | 2011-12-27 22:32:41 -0500 | [diff] [blame] | 2503 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2504 | |
| 2505 | lock_sock(sk); |
| 2506 | |
| 2507 | spin_lock(&po->bind_lock); |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 2508 | unregister_prot_hook(sk, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2509 | po->num = protocol; |
| 2510 | po->prot_hook.type = protocol; |
Ben Greear | 160ff18 | 2011-06-01 07:18:52 +0000 | [diff] [blame] | 2511 | if (po->prot_hook.dev) |
| 2512 | dev_put(po->prot_hook.dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2513 | po->prot_hook.dev = dev; |
| 2514 | |
| 2515 | po->ifindex = dev ? dev->ifindex : 0; |
| 2516 | |
| 2517 | if (protocol == 0) |
| 2518 | goto out_unlock; |
| 2519 | |
Urs Thuermann | be85d4a | 2007-11-12 21:05:20 -0800 | [diff] [blame] | 2520 | if (!dev || (dev->flags & IFF_UP)) { |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 2521 | register_prot_hook(sk); |
Urs Thuermann | be85d4a | 2007-11-12 21:05:20 -0800 | [diff] [blame] | 2522 | } else { |
| 2523 | sk->sk_err = ENETDOWN; |
| 2524 | if (!sock_flag(sk, SOCK_DEAD)) |
| 2525 | sk->sk_error_report(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2526 | } |
| 2527 | |
| 2528 | out_unlock: |
| 2529 | spin_unlock(&po->bind_lock); |
| 2530 | release_sock(sk); |
| 2531 | return 0; |
| 2532 | } |
| 2533 | |
| 2534 | /* |
| 2535 | * Bind a packet socket to a device |
| 2536 | */ |
| 2537 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2538 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
| 2539 | int addr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2540 | { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2541 | struct sock *sk = sock->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2542 | char name[15]; |
| 2543 | struct net_device *dev; |
| 2544 | int err = -ENODEV; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2545 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2546 | /* |
| 2547 | * Check legality |
| 2548 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2549 | |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 2550 | if (addr_len != sizeof(struct sockaddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2551 | return -EINVAL; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2552 | strlcpy(name, uaddr->sa_data, sizeof(name)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2553 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2554 | dev = dev_get_by_name(sock_net(sk), name); |
Ben Greear | 160ff18 | 2011-06-01 07:18:52 +0000 | [diff] [blame] | 2555 | if (dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2556 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2557 | return err; |
| 2558 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2559 | |
| 2560 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
| 2561 | { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2562 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
| 2563 | struct sock *sk = sock->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2564 | struct net_device *dev = NULL; |
| 2565 | int err; |
| 2566 | |
| 2567 | |
| 2568 | /* |
| 2569 | * Check legality |
| 2570 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2571 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2572 | if (addr_len < sizeof(struct sockaddr_ll)) |
| 2573 | return -EINVAL; |
| 2574 | if (sll->sll_family != AF_PACKET) |
| 2575 | return -EINVAL; |
| 2576 | |
| 2577 | if (sll->sll_ifindex) { |
| 2578 | err = -ENODEV; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2579 | dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2580 | if (dev == NULL) |
| 2581 | goto out; |
| 2582 | } |
| 2583 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2584 | |
| 2585 | out: |
| 2586 | return err; |
| 2587 | } |
| 2588 | |
| 2589 | static struct proto packet_proto = { |
| 2590 | .name = "PACKET", |
| 2591 | .owner = THIS_MODULE, |
| 2592 | .obj_size = sizeof(struct packet_sock), |
| 2593 | }; |
| 2594 | |
| 2595 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2596 | * Create a packet of type SOCK_PACKET. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2597 | */ |
| 2598 | |
Eric Paris | 3f378b6 | 2009-11-05 22:18:14 -0800 | [diff] [blame] | 2599 | static int packet_create(struct net *net, struct socket *sock, int protocol, |
| 2600 | int kern) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2601 | { |
| 2602 | struct sock *sk; |
| 2603 | struct packet_sock *po; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 2604 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2605 | int err; |
| 2606 | |
Eric W. Biederman | df008c9 | 2012-11-16 03:03:07 +0000 | [diff] [blame] | 2607 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2608 | return -EPERM; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 2609 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
| 2610 | sock->type != SOCK_PACKET) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2611 | return -ESOCKTNOSUPPORT; |
| 2612 | |
| 2613 | sock->state = SS_UNCONNECTED; |
| 2614 | |
| 2615 | err = -ENOBUFS; |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 2616 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2617 | if (sk == NULL) |
| 2618 | goto out; |
| 2619 | |
| 2620 | sock->ops = &packet_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2621 | if (sock->type == SOCK_PACKET) |
| 2622 | sock->ops = &packet_ops_spkt; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 2623 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2624 | sock_init_data(sock, sk); |
| 2625 | |
| 2626 | po = pkt_sk(sk); |
| 2627 | sk->sk_family = PF_PACKET; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 2628 | po->num = proto; |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2629 | RCU_INIT_POINTER(po->cached_dev, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2630 | |
| 2631 | sk->sk_destruct = packet_sock_destruct; |
Pavel Emelyanov | 17ab56a | 2007-11-10 21:38:48 -0800 | [diff] [blame] | 2632 | sk_refcnt_debug_inc(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2633 | |
| 2634 | /* |
| 2635 | * Attach a protocol block |
| 2636 | */ |
| 2637 | |
| 2638 | spin_lock_init(&po->bind_lock); |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 2639 | mutex_init(&po->pg_vec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2640 | po->prot_hook.func = packet_rcv; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 2641 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2642 | if (sock->type == SOCK_PACKET) |
| 2643 | po->prot_hook.func = packet_rcv_spkt; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 2644 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2645 | po->prot_hook.af_packet_priv = sk; |
| 2646 | |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 2647 | if (proto) { |
| 2648 | po->prot_hook.type = proto; |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 2649 | register_prot_hook(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2650 | } |
| 2651 | |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 2652 | mutex_lock(&net->packet.sklist_lock); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 2653 | sk_add_node_rcu(sk, &net->packet.sklist); |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 2654 | mutex_unlock(&net->packet.sklist_lock); |
| 2655 | |
| 2656 | preempt_disable(); |
Eric Dumazet | 3680453 | 2008-11-19 14:25:35 -0800 | [diff] [blame] | 2657 | sock_prot_inuse_add(net, &packet_proto, 1); |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 2658 | preempt_enable(); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 2659 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2660 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2661 | out: |
| 2662 | return err; |
| 2663 | } |
| 2664 | |
| 2665 | /* |
| 2666 | * Pull a packet from our receive queue and hand it to the user. |
| 2667 | * If necessary we block. |
| 2668 | */ |
| 2669 | |
| 2670 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 2671 | struct msghdr *msg, size_t len, int flags) |
| 2672 | { |
| 2673 | struct sock *sk = sock->sk; |
| 2674 | struct sk_buff *skb; |
| 2675 | int copied, err; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2676 | int vnet_hdr_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2677 | |
| 2678 | err = -EINVAL; |
Richard Cochran | ed85b56 | 2010-04-07 22:41:28 +0000 | [diff] [blame] | 2679 | 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] | 2680 | goto out; |
| 2681 | |
| 2682 | #if 0 |
| 2683 | /* What error should we return now? EUNATTACH? */ |
| 2684 | if (pkt_sk(sk)->ifindex < 0) |
| 2685 | return -ENODEV; |
| 2686 | #endif |
| 2687 | |
Richard Cochran | ed85b56 | 2010-04-07 22:41:28 +0000 | [diff] [blame] | 2688 | if (flags & MSG_ERRQUEUE) { |
Richard Cochran | cb820f8 | 2013-07-19 19:40:09 +0200 | [diff] [blame] | 2689 | err = sock_recv_errqueue(sk, msg, len, |
| 2690 | SOL_PACKET, PACKET_TX_TIMESTAMP); |
Richard Cochran | ed85b56 | 2010-04-07 22:41:28 +0000 | [diff] [blame] | 2691 | goto out; |
| 2692 | } |
| 2693 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2694 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2695 | * Call the generic datagram receiver. This handles all sorts |
| 2696 | * of horrible races and re-entrancy so we can forget about it |
| 2697 | * in the protocol layers. |
| 2698 | * |
| 2699 | * Now it will return ENETDOWN, if device have just gone down, |
| 2700 | * but then it will block. |
| 2701 | */ |
| 2702 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2703 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2704 | |
| 2705 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2706 | * An error occurred so return it. Because skb_recv_datagram() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2707 | * handles the blocking we don't see and worry about blocking |
| 2708 | * retries. |
| 2709 | */ |
| 2710 | |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 2711 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2712 | goto out; |
| 2713 | |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2714 | if (pkt_sk(sk)->has_vnet_hdr) { |
| 2715 | struct virtio_net_hdr vnet_hdr = { 0 }; |
| 2716 | |
| 2717 | err = -EINVAL; |
| 2718 | vnet_hdr_len = sizeof(vnet_hdr); |
Mariusz Kozlowski | 1f18b71 | 2010-11-08 11:58:45 +0000 | [diff] [blame] | 2719 | if (len < vnet_hdr_len) |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2720 | goto out_free; |
| 2721 | |
Mariusz Kozlowski | 1f18b71 | 2010-11-08 11:58:45 +0000 | [diff] [blame] | 2722 | len -= vnet_hdr_len; |
| 2723 | |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2724 | if (skb_is_gso(skb)) { |
| 2725 | struct skb_shared_info *sinfo = skb_shinfo(skb); |
| 2726 | |
| 2727 | /* This is a hint as to how much should be linear. */ |
| 2728 | vnet_hdr.hdr_len = skb_headlen(skb); |
| 2729 | vnet_hdr.gso_size = sinfo->gso_size; |
| 2730 | if (sinfo->gso_type & SKB_GSO_TCPV4) |
| 2731 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
| 2732 | else if (sinfo->gso_type & SKB_GSO_TCPV6) |
| 2733 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
| 2734 | else if (sinfo->gso_type & SKB_GSO_UDP) |
| 2735 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
| 2736 | else if (sinfo->gso_type & SKB_GSO_FCOE) |
| 2737 | goto out_free; |
| 2738 | else |
| 2739 | BUG(); |
| 2740 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
| 2741 | vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
| 2742 | } else |
| 2743 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
| 2744 | |
| 2745 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 2746 | vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
Michał Mirosław | 55508d6 | 2010-12-14 15:24:08 +0000 | [diff] [blame] | 2747 | vnet_hdr.csum_start = skb_checksum_start_offset(skb); |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2748 | vnet_hdr.csum_offset = skb->csum_offset; |
Jason Wang | 10a8d94 | 2011-06-10 00:56:17 +0000 | [diff] [blame] | 2749 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
| 2750 | vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2751 | } /* else everything is zero */ |
| 2752 | |
| 2753 | err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr, |
| 2754 | vnet_hdr_len); |
| 2755 | if (err < 0) |
| 2756 | goto out_free; |
| 2757 | } |
| 2758 | |
Hannes Frederic Sowa | f3d3342 | 2013-11-21 03:14:22 +0100 | [diff] [blame] | 2759 | /* You lose any data beyond the buffer you gave. If it worries |
| 2760 | * a user program they can ask the device for its MTU |
| 2761 | * anyway. |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 2762 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2763 | copied = skb->len; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2764 | if (copied > len) { |
| 2765 | copied = len; |
| 2766 | msg->msg_flags |= MSG_TRUNC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2767 | } |
| 2768 | |
| 2769 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
| 2770 | if (err) |
| 2771 | goto out_free; |
| 2772 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 2773 | sock_recv_ts_and_drops(msg, sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2774 | |
Hannes Frederic Sowa | f3d3342 | 2013-11-21 03:14:22 +0100 | [diff] [blame] | 2775 | if (msg->msg_name) { |
| 2776 | /* If the address length field is there to be filled |
| 2777 | * in, we fill it in now. |
| 2778 | */ |
| 2779 | if (sock->type == SOCK_PACKET) { |
| 2780 | msg->msg_namelen = sizeof(struct sockaddr_pkt); |
| 2781 | } else { |
| 2782 | struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll; |
| 2783 | msg->msg_namelen = sll->sll_halen + |
| 2784 | offsetof(struct sockaddr_ll, sll_addr); |
| 2785 | } |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 2786 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
| 2787 | msg->msg_namelen); |
Hannes Frederic Sowa | f3d3342 | 2013-11-21 03:14:22 +0100 | [diff] [blame] | 2788 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2789 | |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 2790 | if (pkt_sk(sk)->auxdata) { |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 2791 | struct tpacket_auxdata aux; |
| 2792 | |
| 2793 | aux.tp_status = TP_STATUS_USER; |
| 2794 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
| 2795 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; |
| 2796 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; |
| 2797 | aux.tp_snaplen = skb->len; |
| 2798 | aux.tp_mac = 0; |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 2799 | aux.tp_net = skb_network_offset(skb); |
Ben Greear | a3bcc23 | 2011-06-01 06:49:10 +0000 | [diff] [blame] | 2800 | if (vlan_tx_tag_present(skb)) { |
| 2801 | aux.tp_vlan_tci = vlan_tx_tag_get(skb); |
| 2802 | aux.tp_status |= TP_STATUS_VLAN_VALID; |
| 2803 | } else { |
| 2804 | aux.tp_vlan_tci = 0; |
| 2805 | } |
Eric Dumazet | 13fcb7b | 2011-06-06 22:42:06 -0700 | [diff] [blame] | 2806 | aux.tp_padding = 0; |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 2807 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 2808 | } |
| 2809 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2810 | /* |
| 2811 | * Free or return the buffer as appropriate. Again this |
| 2812 | * hides all the races and re-entrancy issues from us. |
| 2813 | */ |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2814 | err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2815 | |
| 2816 | out_free: |
| 2817 | skb_free_datagram(sk, skb); |
| 2818 | out: |
| 2819 | return err; |
| 2820 | } |
| 2821 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2822 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
| 2823 | int *uaddr_len, int peer) |
| 2824 | { |
| 2825 | struct net_device *dev; |
| 2826 | struct sock *sk = sock->sk; |
| 2827 | |
| 2828 | if (peer) |
| 2829 | return -EOPNOTSUPP; |
| 2830 | |
| 2831 | uaddr->sa_family = AF_PACKET; |
Daniel Borkmann | 2dc85bf | 2013-06-12 16:02:27 +0200 | [diff] [blame] | 2832 | memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data)); |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 2833 | rcu_read_lock(); |
| 2834 | dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); |
| 2835 | if (dev) |
Daniel Borkmann | 2dc85bf | 2013-06-12 16:02:27 +0200 | [diff] [blame] | 2836 | strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data)); |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 2837 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2838 | *uaddr_len = sizeof(*uaddr); |
| 2839 | |
| 2840 | return 0; |
| 2841 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2842 | |
| 2843 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, |
| 2844 | int *uaddr_len, int peer) |
| 2845 | { |
| 2846 | struct net_device *dev; |
| 2847 | struct sock *sk = sock->sk; |
| 2848 | struct packet_sock *po = pkt_sk(sk); |
Cyrill Gorcunov | 13cfa97 | 2009-11-08 05:51:19 +0000 | [diff] [blame] | 2849 | DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2850 | |
| 2851 | if (peer) |
| 2852 | return -EOPNOTSUPP; |
| 2853 | |
| 2854 | sll->sll_family = AF_PACKET; |
| 2855 | sll->sll_ifindex = po->ifindex; |
| 2856 | sll->sll_protocol = po->num; |
Vasiliy Kulikov | 6728664 | 2010-11-10 12:09:10 -0800 | [diff] [blame] | 2857 | sll->sll_pkttype = 0; |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 2858 | rcu_read_lock(); |
| 2859 | dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2860 | if (dev) { |
| 2861 | sll->sll_hatype = dev->type; |
| 2862 | sll->sll_halen = dev->addr_len; |
| 2863 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2864 | } else { |
| 2865 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ |
| 2866 | sll->sll_halen = 0; |
| 2867 | } |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 2868 | rcu_read_unlock(); |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 2869 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2870 | |
| 2871 | return 0; |
| 2872 | } |
| 2873 | |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 2874 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
| 2875 | int what) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2876 | { |
| 2877 | switch (i->type) { |
| 2878 | case PACKET_MR_MULTICAST: |
Jiri Pirko | 1162563 | 2010-03-02 20:40:01 +0000 | [diff] [blame] | 2879 | if (i->alen != dev->addr_len) |
| 2880 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2881 | if (what > 0) |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 2882 | return dev_mc_add(dev, i->addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2883 | else |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 2884 | return dev_mc_del(dev, i->addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2885 | break; |
| 2886 | case PACKET_MR_PROMISC: |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 2887 | return dev_set_promiscuity(dev, what); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2888 | break; |
| 2889 | case PACKET_MR_ALLMULTI: |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 2890 | return dev_set_allmulti(dev, what); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2891 | break; |
Eric W. Biederman | d95ed92 | 2009-05-19 18:27:17 +0000 | [diff] [blame] | 2892 | case PACKET_MR_UNICAST: |
Jiri Pirko | 1162563 | 2010-03-02 20:40:01 +0000 | [diff] [blame] | 2893 | if (i->alen != dev->addr_len) |
| 2894 | return -EINVAL; |
Eric W. Biederman | d95ed92 | 2009-05-19 18:27:17 +0000 | [diff] [blame] | 2895 | if (what > 0) |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 2896 | return dev_uc_add(dev, i->addr); |
Eric W. Biederman | d95ed92 | 2009-05-19 18:27:17 +0000 | [diff] [blame] | 2897 | else |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 2898 | return dev_uc_del(dev, i->addr); |
Eric W. Biederman | d95ed92 | 2009-05-19 18:27:17 +0000 | [diff] [blame] | 2899 | break; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2900 | default: |
| 2901 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2902 | } |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 2903 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2904 | } |
| 2905 | |
| 2906 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) |
| 2907 | { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2908 | for ( ; i; i = i->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2909 | if (i->ifindex == dev->ifindex) |
| 2910 | packet_dev_mc(dev, i, what); |
| 2911 | } |
| 2912 | } |
| 2913 | |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 2914 | 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] | 2915 | { |
| 2916 | struct packet_sock *po = pkt_sk(sk); |
| 2917 | struct packet_mclist *ml, *i; |
| 2918 | struct net_device *dev; |
| 2919 | int err; |
| 2920 | |
| 2921 | rtnl_lock(); |
| 2922 | |
| 2923 | err = -ENODEV; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2924 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2925 | if (!dev) |
| 2926 | goto done; |
| 2927 | |
| 2928 | err = -EINVAL; |
Jiri Pirko | 1162563 | 2010-03-02 20:40:01 +0000 | [diff] [blame] | 2929 | if (mreq->mr_alen > dev->addr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2930 | goto done; |
| 2931 | |
| 2932 | err = -ENOBUFS; |
Kris Katterjohn | 8b3a700 | 2006-01-11 15:56:43 -0800 | [diff] [blame] | 2933 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2934 | if (i == NULL) |
| 2935 | goto done; |
| 2936 | |
| 2937 | err = 0; |
| 2938 | for (ml = po->mclist; ml; ml = ml->next) { |
| 2939 | if (ml->ifindex == mreq->mr_ifindex && |
| 2940 | ml->type == mreq->mr_type && |
| 2941 | ml->alen == mreq->mr_alen && |
| 2942 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { |
| 2943 | ml->count++; |
| 2944 | /* Free the new element ... */ |
| 2945 | kfree(i); |
| 2946 | goto done; |
| 2947 | } |
| 2948 | } |
| 2949 | |
| 2950 | i->type = mreq->mr_type; |
| 2951 | i->ifindex = mreq->mr_ifindex; |
| 2952 | i->alen = mreq->mr_alen; |
| 2953 | memcpy(i->addr, mreq->mr_address, i->alen); |
| 2954 | i->count = 1; |
| 2955 | i->next = po->mclist; |
| 2956 | po->mclist = i; |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 2957 | err = packet_dev_mc(dev, i, 1); |
| 2958 | if (err) { |
| 2959 | po->mclist = i->next; |
| 2960 | kfree(i); |
| 2961 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2962 | |
| 2963 | done: |
| 2964 | rtnl_unlock(); |
| 2965 | return err; |
| 2966 | } |
| 2967 | |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 2968 | 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] | 2969 | { |
| 2970 | struct packet_mclist *ml, **mlp; |
| 2971 | |
| 2972 | rtnl_lock(); |
| 2973 | |
| 2974 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { |
| 2975 | if (ml->ifindex == mreq->mr_ifindex && |
| 2976 | ml->type == mreq->mr_type && |
| 2977 | ml->alen == mreq->mr_alen && |
| 2978 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { |
| 2979 | if (--ml->count == 0) { |
| 2980 | struct net_device *dev; |
| 2981 | *mlp = ml->next; |
Eric Dumazet | ad959e7 | 2009-10-16 06:38:46 +0000 | [diff] [blame] | 2982 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
| 2983 | if (dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2984 | packet_dev_mc(dev, ml, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2985 | kfree(ml); |
| 2986 | } |
| 2987 | rtnl_unlock(); |
| 2988 | return 0; |
| 2989 | } |
| 2990 | } |
| 2991 | rtnl_unlock(); |
| 2992 | return -EADDRNOTAVAIL; |
| 2993 | } |
| 2994 | |
| 2995 | static void packet_flush_mclist(struct sock *sk) |
| 2996 | { |
| 2997 | struct packet_sock *po = pkt_sk(sk); |
| 2998 | struct packet_mclist *ml; |
| 2999 | |
| 3000 | if (!po->mclist) |
| 3001 | return; |
| 3002 | |
| 3003 | rtnl_lock(); |
| 3004 | while ((ml = po->mclist) != NULL) { |
| 3005 | struct net_device *dev; |
| 3006 | |
| 3007 | po->mclist = ml->next; |
Eric Dumazet | ad959e7 | 2009-10-16 06:38:46 +0000 | [diff] [blame] | 3008 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
| 3009 | if (dev != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3010 | packet_dev_mc(dev, ml, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3011 | kfree(ml); |
| 3012 | } |
| 3013 | rtnl_unlock(); |
| 3014 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3015 | |
| 3016 | static int |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 3017 | 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] | 3018 | { |
| 3019 | struct sock *sk = sock->sk; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3020 | struct packet_sock *po = pkt_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3021 | int ret; |
| 3022 | |
| 3023 | if (level != SOL_PACKET) |
| 3024 | return -ENOPROTOOPT; |
| 3025 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3026 | switch (optname) { |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3027 | case PACKET_ADD_MEMBERSHIP: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3028 | case PACKET_DROP_MEMBERSHIP: |
| 3029 | { |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 3030 | struct packet_mreq_max mreq; |
| 3031 | int len = optlen; |
| 3032 | memset(&mreq, 0, sizeof(mreq)); |
| 3033 | if (len < sizeof(struct packet_mreq)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3034 | return -EINVAL; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 3035 | if (len > sizeof(mreq)) |
| 3036 | len = sizeof(mreq); |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3037 | if (copy_from_user(&mreq, optval, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3038 | return -EFAULT; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 3039 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
| 3040 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3041 | if (optname == PACKET_ADD_MEMBERSHIP) |
| 3042 | ret = packet_mc_add(sk, &mreq); |
| 3043 | else |
| 3044 | ret = packet_mc_drop(sk, &mreq); |
| 3045 | return ret; |
| 3046 | } |
David S. Miller | a2efcfa | 2007-05-29 13:12:50 -0700 | [diff] [blame] | 3047 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3048 | case PACKET_RX_RING: |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3049 | case PACKET_TX_RING: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3050 | { |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3051 | union tpacket_req_u req_u; |
| 3052 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3053 | |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3054 | switch (po->tp_version) { |
| 3055 | case TPACKET_V1: |
| 3056 | case TPACKET_V2: |
| 3057 | len = sizeof(req_u.req); |
| 3058 | break; |
| 3059 | case TPACKET_V3: |
| 3060 | default: |
| 3061 | len = sizeof(req_u.req3); |
| 3062 | break; |
| 3063 | } |
| 3064 | if (optlen < len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3065 | return -EINVAL; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3066 | if (pkt_sk(sk)->has_vnet_hdr) |
| 3067 | return -EINVAL; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3068 | if (copy_from_user(&req_u.req, optval, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3069 | return -EFAULT; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3070 | return packet_set_ring(sk, &req_u, 0, |
| 3071 | optname == PACKET_TX_RING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3072 | } |
| 3073 | case PACKET_COPY_THRESH: |
| 3074 | { |
| 3075 | int val; |
| 3076 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3077 | if (optlen != sizeof(val)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3078 | return -EINVAL; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3079 | if (copy_from_user(&val, optval, sizeof(val))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3080 | return -EFAULT; |
| 3081 | |
| 3082 | pkt_sk(sk)->copy_thresh = val; |
| 3083 | return 0; |
| 3084 | } |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3085 | case PACKET_VERSION: |
| 3086 | { |
| 3087 | int val; |
| 3088 | |
| 3089 | if (optlen != sizeof(val)) |
| 3090 | return -EINVAL; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3091 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3092 | return -EBUSY; |
| 3093 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3094 | return -EFAULT; |
| 3095 | switch (val) { |
| 3096 | case TPACKET_V1: |
| 3097 | case TPACKET_V2: |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3098 | case TPACKET_V3: |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3099 | po->tp_version = val; |
| 3100 | return 0; |
| 3101 | default: |
| 3102 | return -EINVAL; |
| 3103 | } |
| 3104 | } |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 3105 | case PACKET_RESERVE: |
| 3106 | { |
| 3107 | unsigned int val; |
| 3108 | |
| 3109 | if (optlen != sizeof(val)) |
| 3110 | return -EINVAL; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3111 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 3112 | return -EBUSY; |
| 3113 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3114 | return -EFAULT; |
| 3115 | po->tp_reserve = val; |
| 3116 | return 0; |
| 3117 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3118 | case PACKET_LOSS: |
| 3119 | { |
| 3120 | unsigned int val; |
| 3121 | |
| 3122 | if (optlen != sizeof(val)) |
| 3123 | return -EINVAL; |
| 3124 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
| 3125 | return -EBUSY; |
| 3126 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3127 | return -EFAULT; |
| 3128 | po->tp_loss = !!val; |
| 3129 | return 0; |
| 3130 | } |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3131 | case PACKET_AUXDATA: |
| 3132 | { |
| 3133 | int val; |
| 3134 | |
| 3135 | if (optlen < sizeof(val)) |
| 3136 | return -EINVAL; |
| 3137 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3138 | return -EFAULT; |
| 3139 | |
| 3140 | po->auxdata = !!val; |
| 3141 | return 0; |
| 3142 | } |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 3143 | case PACKET_ORIGDEV: |
| 3144 | { |
| 3145 | int val; |
| 3146 | |
| 3147 | if (optlen < sizeof(val)) |
| 3148 | return -EINVAL; |
| 3149 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3150 | return -EFAULT; |
| 3151 | |
| 3152 | po->origdev = !!val; |
| 3153 | return 0; |
| 3154 | } |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3155 | case PACKET_VNET_HDR: |
| 3156 | { |
| 3157 | int val; |
| 3158 | |
| 3159 | if (sock->type != SOCK_RAW) |
| 3160 | return -EINVAL; |
| 3161 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
| 3162 | return -EBUSY; |
| 3163 | if (optlen < sizeof(val)) |
| 3164 | return -EINVAL; |
| 3165 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3166 | return -EFAULT; |
| 3167 | |
| 3168 | po->has_vnet_hdr = !!val; |
| 3169 | return 0; |
| 3170 | } |
Scott McMillan | 614f60f | 2010-06-02 05:53:56 -0700 | [diff] [blame] | 3171 | case PACKET_TIMESTAMP: |
| 3172 | { |
| 3173 | int val; |
| 3174 | |
| 3175 | if (optlen != sizeof(val)) |
| 3176 | return -EINVAL; |
| 3177 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3178 | return -EFAULT; |
| 3179 | |
| 3180 | po->tp_tstamp = val; |
| 3181 | return 0; |
| 3182 | } |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 3183 | case PACKET_FANOUT: |
| 3184 | { |
| 3185 | int val; |
| 3186 | |
| 3187 | if (optlen != sizeof(val)) |
| 3188 | return -EINVAL; |
| 3189 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3190 | return -EFAULT; |
| 3191 | |
| 3192 | return fanout_add(sk, val & 0xffff, val >> 16); |
| 3193 | } |
Paul Chavent | 5920cd3a | 2012-11-06 23:10:47 +0000 | [diff] [blame] | 3194 | case PACKET_TX_HAS_OFF: |
| 3195 | { |
| 3196 | unsigned int val; |
| 3197 | |
| 3198 | if (optlen != sizeof(val)) |
| 3199 | return -EINVAL; |
| 3200 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
| 3201 | return -EBUSY; |
| 3202 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3203 | return -EFAULT; |
| 3204 | po->tp_tx_has_off = !!val; |
| 3205 | return 0; |
| 3206 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3207 | default: |
| 3208 | return -ENOPROTOOPT; |
| 3209 | } |
| 3210 | } |
| 3211 | |
| 3212 | static int packet_getsockopt(struct socket *sock, int level, int optname, |
| 3213 | char __user *optval, int __user *optlen) |
| 3214 | { |
| 3215 | int len; |
Eric Dumazet | c06fff6 | 2012-04-19 21:56:11 +0000 | [diff] [blame] | 3216 | int val, lv = sizeof(val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3217 | struct sock *sk = sock->sk; |
| 3218 | struct packet_sock *po = pkt_sk(sk); |
Eric Dumazet | c06fff6 | 2012-04-19 21:56:11 +0000 | [diff] [blame] | 3219 | void *data = &val; |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 3220 | union tpacket_stats_u st; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3221 | |
| 3222 | if (level != SOL_PACKET) |
| 3223 | return -ENOPROTOOPT; |
| 3224 | |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 3225 | if (get_user(len, optlen)) |
| 3226 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3227 | |
| 3228 | if (len < 0) |
| 3229 | return -EINVAL; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3230 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3231 | switch (optname) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3232 | case PACKET_STATISTICS: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3233 | spin_lock_bh(&sk->sk_receive_queue.lock); |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 3234 | memcpy(&st, &po->stats, sizeof(st)); |
| 3235 | memset(&po->stats, 0, sizeof(po->stats)); |
| 3236 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 3237 | |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3238 | if (po->tp_version == TPACKET_V3) { |
Eric Dumazet | c06fff6 | 2012-04-19 21:56:11 +0000 | [diff] [blame] | 3239 | lv = sizeof(struct tpacket_stats_v3); |
Willem de Bruijn | 8bcdeaf | 2013-08-19 16:40:22 -0400 | [diff] [blame] | 3240 | st.stats3.tp_packets += st.stats3.tp_drops; |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 3241 | data = &st.stats3; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3242 | } else { |
Eric Dumazet | c06fff6 | 2012-04-19 21:56:11 +0000 | [diff] [blame] | 3243 | lv = sizeof(struct tpacket_stats); |
Willem de Bruijn | 8bcdeaf | 2013-08-19 16:40:22 -0400 | [diff] [blame] | 3244 | st.stats1.tp_packets += st.stats1.tp_drops; |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 3245 | data = &st.stats1; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3246 | } |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 3247 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3248 | break; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3249 | case PACKET_AUXDATA: |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3250 | val = po->auxdata; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3251 | break; |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 3252 | case PACKET_ORIGDEV: |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 3253 | val = po->origdev; |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 3254 | break; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3255 | case PACKET_VNET_HDR: |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3256 | val = po->has_vnet_hdr; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3257 | break; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3258 | case PACKET_VERSION: |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3259 | val = po->tp_version; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3260 | break; |
| 3261 | case PACKET_HDRLEN: |
| 3262 | if (len > sizeof(int)) |
| 3263 | len = sizeof(int); |
| 3264 | if (copy_from_user(&val, optval, len)) |
| 3265 | return -EFAULT; |
| 3266 | switch (val) { |
| 3267 | case TPACKET_V1: |
| 3268 | val = sizeof(struct tpacket_hdr); |
| 3269 | break; |
| 3270 | case TPACKET_V2: |
| 3271 | val = sizeof(struct tpacket2_hdr); |
| 3272 | break; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3273 | case TPACKET_V3: |
| 3274 | val = sizeof(struct tpacket3_hdr); |
| 3275 | break; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3276 | default: |
| 3277 | return -EINVAL; |
| 3278 | } |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3279 | break; |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 3280 | case PACKET_RESERVE: |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 3281 | val = po->tp_reserve; |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 3282 | break; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3283 | case PACKET_LOSS: |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3284 | val = po->tp_loss; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3285 | break; |
Scott McMillan | 614f60f | 2010-06-02 05:53:56 -0700 | [diff] [blame] | 3286 | case PACKET_TIMESTAMP: |
Scott McMillan | 614f60f | 2010-06-02 05:53:56 -0700 | [diff] [blame] | 3287 | val = po->tp_tstamp; |
Scott McMillan | 614f60f | 2010-06-02 05:53:56 -0700 | [diff] [blame] | 3288 | break; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 3289 | case PACKET_FANOUT: |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 3290 | val = (po->fanout ? |
| 3291 | ((u32)po->fanout->id | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 3292 | ((u32)po->fanout->type << 16) | |
| 3293 | ((u32)po->fanout->flags << 24)) : |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 3294 | 0); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 3295 | break; |
Paul Chavent | 5920cd3a | 2012-11-06 23:10:47 +0000 | [diff] [blame] | 3296 | case PACKET_TX_HAS_OFF: |
| 3297 | val = po->tp_tx_has_off; |
| 3298 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3299 | default: |
| 3300 | return -ENOPROTOOPT; |
| 3301 | } |
| 3302 | |
Eric Dumazet | c06fff6 | 2012-04-19 21:56:11 +0000 | [diff] [blame] | 3303 | if (len > lv) |
| 3304 | len = lv; |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 3305 | if (put_user(len, optlen)) |
| 3306 | return -EFAULT; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3307 | if (copy_to_user(optval, data, len)) |
| 3308 | return -EFAULT; |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 3309 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3310 | } |
| 3311 | |
| 3312 | |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 3313 | static int packet_notifier(struct notifier_block *this, |
| 3314 | unsigned long msg, void *ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3315 | { |
| 3316 | struct sock *sk; |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 3317 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 3318 | struct net *net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3319 | |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3320 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 3321 | sk_for_each_rcu(sk, &net->packet.sklist) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3322 | struct packet_sock *po = pkt_sk(sk); |
| 3323 | |
| 3324 | switch (msg) { |
| 3325 | case NETDEV_UNREGISTER: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3326 | if (po->mclist) |
| 3327 | packet_dev_mclist(dev, po->mclist, -1); |
David S. Miller | a2efcfa | 2007-05-29 13:12:50 -0700 | [diff] [blame] | 3328 | /* fallthrough */ |
| 3329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3330 | case NETDEV_DOWN: |
| 3331 | if (dev->ifindex == po->ifindex) { |
| 3332 | spin_lock(&po->bind_lock); |
| 3333 | if (po->running) { |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 3334 | __unregister_prot_hook(sk, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3335 | sk->sk_err = ENETDOWN; |
| 3336 | if (!sock_flag(sk, SOCK_DEAD)) |
| 3337 | sk->sk_error_report(sk); |
| 3338 | } |
| 3339 | if (msg == NETDEV_UNREGISTER) { |
| 3340 | po->ifindex = -1; |
Ben Greear | 160ff18 | 2011-06-01 07:18:52 +0000 | [diff] [blame] | 3341 | if (po->prot_hook.dev) |
| 3342 | dev_put(po->prot_hook.dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3343 | po->prot_hook.dev = NULL; |
| 3344 | } |
| 3345 | spin_unlock(&po->bind_lock); |
| 3346 | } |
| 3347 | break; |
| 3348 | case NETDEV_UP: |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3349 | if (dev->ifindex == po->ifindex) { |
| 3350 | spin_lock(&po->bind_lock); |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 3351 | if (po->num) |
| 3352 | register_prot_hook(sk); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3353 | spin_unlock(&po->bind_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3354 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3355 | break; |
| 3356 | } |
| 3357 | } |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3358 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3359 | return NOTIFY_DONE; |
| 3360 | } |
| 3361 | |
| 3362 | |
| 3363 | static int packet_ioctl(struct socket *sock, unsigned int cmd, |
| 3364 | unsigned long arg) |
| 3365 | { |
| 3366 | struct sock *sk = sock->sk; |
| 3367 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3368 | switch (cmd) { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3369 | case SIOCOUTQ: |
| 3370 | { |
| 3371 | int amount = sk_wmem_alloc_get(sk); |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 3372 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3373 | return put_user(amount, (int __user *)arg); |
| 3374 | } |
| 3375 | case SIOCINQ: |
| 3376 | { |
| 3377 | struct sk_buff *skb; |
| 3378 | int amount = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3379 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3380 | spin_lock_bh(&sk->sk_receive_queue.lock); |
| 3381 | skb = skb_peek(&sk->sk_receive_queue); |
| 3382 | if (skb) |
| 3383 | amount = skb->len; |
| 3384 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 3385 | return put_user(amount, (int __user *)arg); |
| 3386 | } |
| 3387 | case SIOCGSTAMP: |
| 3388 | return sock_get_timestamp(sk, (struct timeval __user *)arg); |
| 3389 | case SIOCGSTAMPNS: |
| 3390 | return sock_get_timestampns(sk, (struct timespec __user *)arg); |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3391 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3392 | #ifdef CONFIG_INET |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3393 | case SIOCADDRT: |
| 3394 | case SIOCDELRT: |
| 3395 | case SIOCDARP: |
| 3396 | case SIOCGARP: |
| 3397 | case SIOCSARP: |
| 3398 | case SIOCGIFADDR: |
| 3399 | case SIOCSIFADDR: |
| 3400 | case SIOCGIFBRDADDR: |
| 3401 | case SIOCSIFBRDADDR: |
| 3402 | case SIOCGIFNETMASK: |
| 3403 | case SIOCSIFNETMASK: |
| 3404 | case SIOCGIFDSTADDR: |
| 3405 | case SIOCSIFDSTADDR: |
| 3406 | case SIOCSIFFLAGS: |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3407 | return inet_dgram_ops.ioctl(sock, cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3408 | #endif |
| 3409 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3410 | default: |
| 3411 | return -ENOIOCTLCMD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3412 | } |
| 3413 | return 0; |
| 3414 | } |
| 3415 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3416 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3417 | poll_table *wait) |
| 3418 | { |
| 3419 | struct sock *sk = sock->sk; |
| 3420 | struct packet_sock *po = pkt_sk(sk); |
| 3421 | unsigned int mask = datagram_poll(file, sock, wait); |
| 3422 | |
| 3423 | spin_lock_bh(&sk->sk_receive_queue.lock); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3424 | if (po->rx_ring.pg_vec) { |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3425 | if (!packet_previous_rx_frame(po, &po->rx_ring, |
| 3426 | TP_STATUS_KERNEL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3427 | mask |= POLLIN | POLLRDNORM; |
| 3428 | } |
| 3429 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3430 | spin_lock_bh(&sk->sk_write_queue.lock); |
| 3431 | if (po->tx_ring.pg_vec) { |
| 3432 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) |
| 3433 | mask |= POLLOUT | POLLWRNORM; |
| 3434 | } |
| 3435 | spin_unlock_bh(&sk->sk_write_queue.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3436 | return mask; |
| 3437 | } |
| 3438 | |
| 3439 | |
| 3440 | /* Dirty? Well, I still did not learn better way to account |
| 3441 | * for user mmaps. |
| 3442 | */ |
| 3443 | |
| 3444 | static void packet_mm_open(struct vm_area_struct *vma) |
| 3445 | { |
| 3446 | struct file *file = vma->vm_file; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3447 | struct socket *sock = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3448 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3449 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3450 | if (sk) |
| 3451 | atomic_inc(&pkt_sk(sk)->mapped); |
| 3452 | } |
| 3453 | |
| 3454 | static void packet_mm_close(struct vm_area_struct *vma) |
| 3455 | { |
| 3456 | struct file *file = vma->vm_file; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3457 | struct socket *sock = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3458 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3459 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3460 | if (sk) |
| 3461 | atomic_dec(&pkt_sk(sk)->mapped); |
| 3462 | } |
| 3463 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 3464 | static const struct vm_operations_struct packet_mmap_ops = { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3465 | .open = packet_mm_open, |
| 3466 | .close = packet_mm_close, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3467 | }; |
| 3468 | |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3469 | static void free_pg_vec(struct pgv *pg_vec, unsigned int order, |
| 3470 | unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3471 | { |
| 3472 | int i; |
| 3473 | |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3474 | for (i = 0; i < len; i++) { |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3475 | if (likely(pg_vec[i].buffer)) { |
Changli Gao | c56b4d9 | 2010-12-01 02:52:57 +0000 | [diff] [blame] | 3476 | if (is_vmalloc_addr(pg_vec[i].buffer)) |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3477 | vfree(pg_vec[i].buffer); |
| 3478 | else |
| 3479 | free_pages((unsigned long)pg_vec[i].buffer, |
| 3480 | order); |
| 3481 | pg_vec[i].buffer = NULL; |
| 3482 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3483 | } |
| 3484 | kfree(pg_vec); |
| 3485 | } |
| 3486 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 3487 | static char *alloc_one_pg_vec_page(unsigned long order) |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3488 | { |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3489 | char *buffer = NULL; |
| 3490 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | |
| 3491 | __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY; |
Eric Dumazet | 719bfea | 2009-04-15 03:39:52 -0700 | [diff] [blame] | 3492 | |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3493 | buffer = (char *) __get_free_pages(gfp_flags, order); |
| 3494 | |
| 3495 | if (buffer) |
| 3496 | return buffer; |
| 3497 | |
| 3498 | /* |
| 3499 | * __get_free_pages failed, fall back to vmalloc |
| 3500 | */ |
Eric Dumazet | bbce5a5 | 2010-11-20 07:31:54 +0000 | [diff] [blame] | 3501 | buffer = vzalloc((1 << order) * PAGE_SIZE); |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3502 | |
| 3503 | if (buffer) |
| 3504 | return buffer; |
| 3505 | |
| 3506 | /* |
| 3507 | * vmalloc failed, lets dig into swap here |
| 3508 | */ |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3509 | gfp_flags &= ~__GFP_NORETRY; |
| 3510 | buffer = (char *)__get_free_pages(gfp_flags, order); |
| 3511 | if (buffer) |
| 3512 | return buffer; |
| 3513 | |
| 3514 | /* |
| 3515 | * complete and utter failure |
| 3516 | */ |
| 3517 | return NULL; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3518 | } |
| 3519 | |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3520 | 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] | 3521 | { |
| 3522 | unsigned int block_nr = req->tp_block_nr; |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3523 | struct pgv *pg_vec; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3524 | int i; |
| 3525 | |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3526 | pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL); |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3527 | if (unlikely(!pg_vec)) |
| 3528 | goto out; |
| 3529 | |
| 3530 | for (i = 0; i < block_nr; i++) { |
Changli Gao | c56b4d9 | 2010-12-01 02:52:57 +0000 | [diff] [blame] | 3531 | pg_vec[i].buffer = alloc_one_pg_vec_page(order); |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3532 | if (unlikely(!pg_vec[i].buffer)) |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3533 | goto out_free_pgvec; |
| 3534 | } |
| 3535 | |
| 3536 | out: |
| 3537 | return pg_vec; |
| 3538 | |
| 3539 | out_free_pgvec: |
| 3540 | free_pg_vec(pg_vec, order, block_nr); |
| 3541 | pg_vec = NULL; |
| 3542 | goto out; |
| 3543 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3544 | |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3545 | 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] | 3546 | int closing, int tx_ring) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3547 | { |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3548 | struct pgv *pg_vec = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3549 | struct packet_sock *po = pkt_sk(sk); |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 3550 | int was_running, order = 0; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3551 | struct packet_ring_buffer *rb; |
| 3552 | struct sk_buff_head *rb_queue; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 3553 | __be16 num; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3554 | int err = -EINVAL; |
| 3555 | /* Added to avoid minimal code churn */ |
| 3556 | struct tpacket_req *req = &req_u->req; |
| 3557 | |
| 3558 | /* Opening a Tx-ring is NOT supported in TPACKET_V3 */ |
| 3559 | if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) { |
| 3560 | WARN(1, "Tx-ring is not supported.\n"); |
| 3561 | goto out; |
| 3562 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3563 | |
| 3564 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
| 3565 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; |
| 3566 | |
| 3567 | err = -EBUSY; |
| 3568 | if (!closing) { |
| 3569 | if (atomic_read(&po->mapped)) |
| 3570 | goto out; |
| 3571 | if (atomic_read(&rb->pending)) |
| 3572 | goto out; |
| 3573 | } |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3574 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3575 | if (req->tp_block_nr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3576 | /* Sanity tests and some calculations */ |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3577 | err = -EBUSY; |
| 3578 | if (unlikely(rb->pg_vec)) |
| 3579 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3580 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3581 | switch (po->tp_version) { |
| 3582 | case TPACKET_V1: |
| 3583 | po->tp_hdrlen = TPACKET_HDRLEN; |
| 3584 | break; |
| 3585 | case TPACKET_V2: |
| 3586 | po->tp_hdrlen = TPACKET2_HDRLEN; |
| 3587 | break; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3588 | case TPACKET_V3: |
| 3589 | po->tp_hdrlen = TPACKET3_HDRLEN; |
| 3590 | break; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3591 | } |
| 3592 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3593 | err = -EINVAL; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3594 | if (unlikely((int)req->tp_block_size <= 0)) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3595 | goto out; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3596 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3597 | goto out; |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 3598 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3599 | po->tp_reserve)) |
| 3600 | goto out; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3601 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3602 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3603 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3604 | rb->frames_per_block = req->tp_block_size/req->tp_frame_size; |
| 3605 | if (unlikely(rb->frames_per_block <= 0)) |
| 3606 | goto out; |
| 3607 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != |
| 3608 | req->tp_frame_nr)) |
| 3609 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3610 | |
| 3611 | err = -ENOMEM; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3612 | order = get_order(req->tp_block_size); |
| 3613 | pg_vec = alloc_pg_vec(req, order); |
| 3614 | if (unlikely(!pg_vec)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3615 | goto out; |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3616 | switch (po->tp_version) { |
| 3617 | case TPACKET_V3: |
| 3618 | /* Transmit path is not supported. We checked |
| 3619 | * it above but just being paranoid |
| 3620 | */ |
| 3621 | if (!tx_ring) |
| 3622 | init_prb_bdqc(po, rb, pg_vec, req_u, tx_ring); |
| 3623 | break; |
| 3624 | default: |
| 3625 | break; |
| 3626 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3627 | } |
| 3628 | /* Done */ |
| 3629 | else { |
| 3630 | err = -EINVAL; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3631 | if (unlikely(req->tp_frame_nr)) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3632 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3633 | } |
| 3634 | |
| 3635 | lock_sock(sk); |
| 3636 | |
| 3637 | /* Detach socket from network */ |
| 3638 | spin_lock(&po->bind_lock); |
| 3639 | was_running = po->running; |
| 3640 | num = po->num; |
| 3641 | if (was_running) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3642 | po->num = 0; |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 3643 | __unregister_prot_hook(sk, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3644 | } |
| 3645 | spin_unlock(&po->bind_lock); |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3646 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3647 | synchronize_net(); |
| 3648 | |
| 3649 | err = -EBUSY; |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 3650 | mutex_lock(&po->pg_vec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3651 | if (closing || atomic_read(&po->mapped) == 0) { |
| 3652 | err = 0; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3653 | spin_lock_bh(&rb_queue->lock); |
Changli Gao | c053fd9 | 2010-12-10 16:02:20 -0800 | [diff] [blame] | 3654 | swap(rb->pg_vec, pg_vec); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3655 | rb->frame_max = (req->tp_frame_nr - 1); |
| 3656 | rb->head = 0; |
| 3657 | rb->frame_size = req->tp_frame_size; |
| 3658 | spin_unlock_bh(&rb_queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3659 | |
Changli Gao | c053fd9 | 2010-12-10 16:02:20 -0800 | [diff] [blame] | 3660 | swap(rb->pg_vec_order, order); |
| 3661 | swap(rb->pg_vec_len, req->tp_block_nr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3662 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3663 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; |
| 3664 | po->prot_hook.func = (po->rx_ring.pg_vec) ? |
| 3665 | tpacket_rcv : packet_rcv; |
| 3666 | skb_queue_purge(rb_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3667 | if (atomic_read(&po->mapped)) |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3668 | pr_err("packet_mmap: vma is busy: %d\n", |
| 3669 | atomic_read(&po->mapped)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3670 | } |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 3671 | mutex_unlock(&po->pg_vec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3672 | |
| 3673 | spin_lock(&po->bind_lock); |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 3674 | if (was_running) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3675 | po->num = num; |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 3676 | register_prot_hook(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3677 | } |
| 3678 | spin_unlock(&po->bind_lock); |
chetan loke | f6fb8f10 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3679 | if (closing && (po->tp_version > TPACKET_V2)) { |
| 3680 | /* Because we don't support block-based V3 on tx-ring */ |
| 3681 | if (!tx_ring) |
| 3682 | prb_shutdown_retire_blk_timer(po, tx_ring, rb_queue); |
| 3683 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3684 | release_sock(sk); |
| 3685 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3686 | if (pg_vec) |
| 3687 | free_pg_vec(pg_vec, order, req->tp_block_nr); |
| 3688 | out: |
| 3689 | return err; |
| 3690 | } |
| 3691 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3692 | static int packet_mmap(struct file *file, struct socket *sock, |
| 3693 | struct vm_area_struct *vma) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3694 | { |
| 3695 | struct sock *sk = sock->sk; |
| 3696 | struct packet_sock *po = pkt_sk(sk); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3697 | unsigned long size, expected_size; |
| 3698 | struct packet_ring_buffer *rb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3699 | unsigned long start; |
| 3700 | int err = -EINVAL; |
| 3701 | int i; |
| 3702 | |
| 3703 | if (vma->vm_pgoff) |
| 3704 | return -EINVAL; |
| 3705 | |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 3706 | mutex_lock(&po->pg_vec_lock); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3707 | |
| 3708 | expected_size = 0; |
| 3709 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
| 3710 | if (rb->pg_vec) { |
| 3711 | expected_size += rb->pg_vec_len |
| 3712 | * rb->pg_vec_pages |
| 3713 | * PAGE_SIZE; |
| 3714 | } |
| 3715 | } |
| 3716 | |
| 3717 | if (expected_size == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3718 | goto out; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3719 | |
| 3720 | size = vma->vm_end - vma->vm_start; |
| 3721 | if (size != expected_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3722 | goto out; |
| 3723 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3724 | start = vma->vm_start; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3725 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
| 3726 | if (rb->pg_vec == NULL) |
| 3727 | continue; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3728 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3729 | for (i = 0; i < rb->pg_vec_len; i++) { |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3730 | struct page *page; |
| 3731 | void *kaddr = rb->pg_vec[i].buffer; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3732 | int pg_num; |
| 3733 | |
Changli Gao | c56b4d9 | 2010-12-01 02:52:57 +0000 | [diff] [blame] | 3734 | for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) { |
| 3735 | page = pgv_to_page(kaddr); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3736 | err = vm_insert_page(vma, start, page); |
| 3737 | if (unlikely(err)) |
| 3738 | goto out; |
| 3739 | start += PAGE_SIZE; |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3740 | kaddr += PAGE_SIZE; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3741 | } |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3742 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3743 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3744 | |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3745 | atomic_inc(&po->mapped); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3746 | vma->vm_ops = &packet_mmap_ops; |
| 3747 | err = 0; |
| 3748 | |
| 3749 | out: |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 3750 | mutex_unlock(&po->pg_vec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3751 | return err; |
| 3752 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3753 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 3754 | static const struct proto_ops packet_ops_spkt = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3755 | .family = PF_PACKET, |
| 3756 | .owner = THIS_MODULE, |
| 3757 | .release = packet_release, |
| 3758 | .bind = packet_bind_spkt, |
| 3759 | .connect = sock_no_connect, |
| 3760 | .socketpair = sock_no_socketpair, |
| 3761 | .accept = sock_no_accept, |
| 3762 | .getname = packet_getname_spkt, |
| 3763 | .poll = datagram_poll, |
| 3764 | .ioctl = packet_ioctl, |
| 3765 | .listen = sock_no_listen, |
| 3766 | .shutdown = sock_no_shutdown, |
| 3767 | .setsockopt = sock_no_setsockopt, |
| 3768 | .getsockopt = sock_no_getsockopt, |
| 3769 | .sendmsg = packet_sendmsg_spkt, |
| 3770 | .recvmsg = packet_recvmsg, |
| 3771 | .mmap = sock_no_mmap, |
| 3772 | .sendpage = sock_no_sendpage, |
| 3773 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3774 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 3775 | static const struct proto_ops packet_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3776 | .family = PF_PACKET, |
| 3777 | .owner = THIS_MODULE, |
| 3778 | .release = packet_release, |
| 3779 | .bind = packet_bind, |
| 3780 | .connect = sock_no_connect, |
| 3781 | .socketpair = sock_no_socketpair, |
| 3782 | .accept = sock_no_accept, |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3783 | .getname = packet_getname, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3784 | .poll = packet_poll, |
| 3785 | .ioctl = packet_ioctl, |
| 3786 | .listen = sock_no_listen, |
| 3787 | .shutdown = sock_no_shutdown, |
| 3788 | .setsockopt = packet_setsockopt, |
| 3789 | .getsockopt = packet_getsockopt, |
| 3790 | .sendmsg = packet_sendmsg, |
| 3791 | .recvmsg = packet_recvmsg, |
| 3792 | .mmap = packet_mmap, |
| 3793 | .sendpage = sock_no_sendpage, |
| 3794 | }; |
| 3795 | |
Stephen Hemminger | ec1b4cf | 2009-10-05 05:58:39 +0000 | [diff] [blame] | 3796 | static const struct net_proto_family packet_family_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3797 | .family = PF_PACKET, |
| 3798 | .create = packet_create, |
| 3799 | .owner = THIS_MODULE, |
| 3800 | }; |
| 3801 | |
| 3802 | static struct notifier_block packet_netdev_notifier = { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3803 | .notifier_call = packet_notifier, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3804 | }; |
| 3805 | |
| 3806 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3807 | |
| 3808 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3809 | __acquires(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3810 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 3811 | struct net *net = seq_file_net(seq); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3812 | |
| 3813 | rcu_read_lock(); |
| 3814 | return seq_hlist_start_head_rcu(&net->packet.sklist, *pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3815 | } |
| 3816 | |
| 3817 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 3818 | { |
Herbert Xu | 1bf4095 | 2007-12-16 14:04:02 -0800 | [diff] [blame] | 3819 | struct net *net = seq_file_net(seq); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3820 | return seq_hlist_next_rcu(v, &net->packet.sklist, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3821 | } |
| 3822 | |
| 3823 | static void packet_seq_stop(struct seq_file *seq, void *v) |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3824 | __releases(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3825 | { |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3826 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3827 | } |
| 3828 | |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3829 | static int packet_seq_show(struct seq_file *seq, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3830 | { |
| 3831 | if (v == SEQ_START_TOKEN) |
| 3832 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); |
| 3833 | else { |
Li Zefan | b7ceabd | 2010-02-08 23:19:29 +0000 | [diff] [blame] | 3834 | struct sock *s = sk_entry(v); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3835 | const struct packet_sock *po = pkt_sk(s); |
| 3836 | |
| 3837 | seq_printf(seq, |
Dan Rosenberg | 71338aa | 2011-05-23 12:17:35 +0000 | [diff] [blame] | 3838 | "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3839 | s, |
| 3840 | atomic_read(&s->sk_refcnt), |
| 3841 | s->sk_type, |
| 3842 | ntohs(po->num), |
| 3843 | po->ifindex, |
| 3844 | po->running, |
| 3845 | atomic_read(&s->sk_rmem_alloc), |
Eric W. Biederman | a7cb5a4 | 2012-05-24 01:10:10 -0600 | [diff] [blame] | 3846 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)), |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3847 | sock_i_ino(s)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3848 | } |
| 3849 | |
| 3850 | return 0; |
| 3851 | } |
| 3852 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 3853 | static const struct seq_operations packet_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3854 | .start = packet_seq_start, |
| 3855 | .next = packet_seq_next, |
| 3856 | .stop = packet_seq_stop, |
| 3857 | .show = packet_seq_show, |
| 3858 | }; |
| 3859 | |
| 3860 | static int packet_seq_open(struct inode *inode, struct file *file) |
| 3861 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 3862 | return seq_open_net(inode, file, &packet_seq_ops, |
| 3863 | sizeof(struct seq_net_private)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3864 | } |
| 3865 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 3866 | static const struct file_operations packet_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3867 | .owner = THIS_MODULE, |
| 3868 | .open = packet_seq_open, |
| 3869 | .read = seq_read, |
| 3870 | .llseek = seq_lseek, |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 3871 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3872 | }; |
| 3873 | |
| 3874 | #endif |
| 3875 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 3876 | static int __net_init packet_net_init(struct net *net) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 3877 | { |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 3878 | mutex_init(&net->packet.sklist_lock); |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 3879 | INIT_HLIST_HEAD(&net->packet.sklist); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 3880 | |
Gao feng | d4beaa6 | 2013-02-18 01:34:54 +0000 | [diff] [blame] | 3881 | if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops)) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 3882 | return -ENOMEM; |
| 3883 | |
| 3884 | return 0; |
| 3885 | } |
| 3886 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 3887 | static void __net_exit packet_net_exit(struct net *net) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 3888 | { |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 3889 | remove_proc_entry("packet", net->proc_net); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 3890 | } |
| 3891 | |
| 3892 | static struct pernet_operations packet_net_ops = { |
| 3893 | .init = packet_net_init, |
| 3894 | .exit = packet_net_exit, |
| 3895 | }; |
| 3896 | |
| 3897 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3898 | static void __exit packet_exit(void) |
| 3899 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3900 | unregister_netdevice_notifier(&packet_netdev_notifier); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 3901 | unregister_pernet_subsys(&packet_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3902 | sock_unregister(PF_PACKET); |
| 3903 | proto_unregister(&packet_proto); |
| 3904 | } |
| 3905 | |
| 3906 | static int __init packet_init(void) |
| 3907 | { |
| 3908 | int rc = proto_register(&packet_proto, 0); |
| 3909 | |
| 3910 | if (rc != 0) |
| 3911 | goto out; |
| 3912 | |
| 3913 | sock_register(&packet_family_ops); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 3914 | register_pernet_subsys(&packet_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3915 | register_netdevice_notifier(&packet_netdev_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3916 | out: |
| 3917 | return rc; |
| 3918 | } |
| 3919 | |
| 3920 | module_init(packet_init); |
| 3921 | module_exit(packet_exit); |
| 3922 | MODULE_LICENSE("GPL"); |
| 3923 | MODULE_ALIAS_NETPROTO(PF_PACKET); |