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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | * |
| 44 | * This program is free software; you can redistribute it and/or |
| 45 | * modify it under the terms of the GNU General Public License |
| 46 | * as published by the Free Software Foundation; either version |
| 47 | * 2 of the License, or (at your option) any later version. |
| 48 | * |
| 49 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | #include <linux/mm.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 53 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #include <linux/fcntl.h> |
| 55 | #include <linux/socket.h> |
| 56 | #include <linux/in.h> |
| 57 | #include <linux/inet.h> |
| 58 | #include <linux/netdevice.h> |
| 59 | #include <linux/if_packet.h> |
| 60 | #include <linux/wireless.h> |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 61 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | #include <linux/kmod.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 63 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | #include <net/ip.h> |
| 65 | #include <net/protocol.h> |
| 66 | #include <linux/skbuff.h> |
| 67 | #include <net/sock.h> |
| 68 | #include <linux/errno.h> |
| 69 | #include <linux/timer.h> |
| 70 | #include <asm/system.h> |
| 71 | #include <asm/uaccess.h> |
| 72 | #include <asm/ioctls.h> |
| 73 | #include <asm/page.h> |
Al Viro | a1f8e7f | 2006-10-19 16:08:53 -0400 | [diff] [blame] | 74 | #include <asm/cacheflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | #include <asm/io.h> |
| 76 | #include <linux/proc_fs.h> |
| 77 | #include <linux/seq_file.h> |
| 78 | #include <linux/poll.h> |
| 79 | #include <linux/module.h> |
| 80 | #include <linux/init.h> |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 81 | #include <linux/mutex.h> |
Eric Dumazet | 05423b2 | 2009-10-26 18:40:35 -0700 | [diff] [blame] | 82 | #include <linux/if_vlan.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
| 84 | #ifdef CONFIG_INET |
| 85 | #include <net/inet_common.h> |
| 86 | #endif |
| 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | Assumptions: |
| 90 | - if device has no dev->hard_header routine, it adds and removes ll header |
| 91 | inside itself. In this case ll header is invisible outside of device, |
| 92 | but higher levels still should reserve dev->hard_header_len. |
| 93 | Some devices are enough clever to reallocate skb, when header |
| 94 | will not fit to reserved space (tunnel), another ones are silly |
| 95 | (PPP). |
| 96 | - packet socket receives packets with pulled ll header, |
| 97 | so that SOCK_RAW should push it back. |
| 98 | |
| 99 | On receive: |
| 100 | ----------- |
| 101 | |
| 102 | Incoming, dev->hard_header!=NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 103 | mac_header -> ll header |
| 104 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | |
| 106 | Outgoing, dev->hard_header!=NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 107 | mac_header -> ll header |
| 108 | data -> ll header |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
| 110 | Incoming, dev->hard_header==NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 111 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
| 112 | header. PPP makes it, that is wrong, because introduce |
YOSHIFUJI Hideaki | db0c58f | 2007-07-19 10:44:35 +0900 | [diff] [blame] | 113 | assymetry between rx and tx paths. |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 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 -> data. ll header is still not built! |
| 118 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
| 120 | Resume |
| 121 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. |
| 122 | |
| 123 | |
| 124 | On transmit: |
| 125 | ------------ |
| 126 | |
| 127 | dev->hard_header != NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 128 | mac_header -> ll header |
| 129 | data -> ll header |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
| 131 | 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] | 132 | mac_header -> data |
| 133 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
| 135 | We should set nh.raw on output to correct posistion, |
| 136 | packet classifier depends on it. |
| 137 | */ |
| 138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | /* Private packet socket structures. */ |
| 140 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 141 | struct packet_mclist { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | struct packet_mclist *next; |
| 143 | int ifindex; |
| 144 | int count; |
| 145 | unsigned short type; |
| 146 | unsigned short alen; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 147 | unsigned char addr[MAX_ADDR_LEN]; |
| 148 | }; |
| 149 | /* identical to struct packet_mreq except it has |
| 150 | * a longer address field. |
| 151 | */ |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 152 | struct packet_mreq_max { |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 153 | int mr_ifindex; |
| 154 | unsigned short mr_type; |
| 155 | unsigned short mr_alen; |
| 156 | unsigned char mr_address[MAX_ADDR_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | }; |
David S. Miller | a2efcfa | 2007-05-29 13:12:50 -0700 | [diff] [blame] | 158 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | #ifdef CONFIG_PACKET_MMAP |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 160 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
| 161 | int closing, int tx_ring); |
| 162 | |
| 163 | struct packet_ring_buffer { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 164 | char **pg_vec; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 165 | unsigned int head; |
| 166 | unsigned int frames_per_block; |
| 167 | unsigned int frame_size; |
| 168 | unsigned int frame_max; |
| 169 | |
| 170 | unsigned int pg_vec_order; |
| 171 | unsigned int pg_vec_pages; |
| 172 | unsigned int pg_vec_len; |
| 173 | |
| 174 | atomic_t pending; |
| 175 | }; |
| 176 | |
| 177 | struct packet_sock; |
| 178 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | #endif |
| 180 | |
| 181 | static void packet_flush_mclist(struct sock *sk); |
| 182 | |
| 183 | struct packet_sock { |
| 184 | /* struct sock has to be the first member of packet_sock */ |
| 185 | struct sock sk; |
| 186 | struct tpacket_stats stats; |
| 187 | #ifdef CONFIG_PACKET_MMAP |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 188 | struct packet_ring_buffer rx_ring; |
| 189 | struct packet_ring_buffer tx_ring; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | int copy_thresh; |
| 191 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | spinlock_t bind_lock; |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 193 | struct mutex pg_vec_lock; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 194 | unsigned int running:1, /* prot_hook is attached*/ |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 195 | auxdata:1, |
| 196 | origdev:1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | int ifindex; /* bound device */ |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 198 | __be16 num; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | struct packet_mclist *mclist; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | #ifdef CONFIG_PACKET_MMAP |
| 201 | atomic_t mapped; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 202 | enum tpacket_versions tp_version; |
| 203 | unsigned int tp_hdrlen; |
Patrick McHardy | 8913336 | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 204 | unsigned int tp_reserve; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 205 | unsigned int tp_loss:1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | #endif |
Eric Dumazet | 94b0595 | 2009-10-16 04:02:20 +0000 | [diff] [blame] | 207 | struct packet_type prot_hook ____cacheline_aligned_in_smp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | }; |
| 209 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 210 | struct packet_skb_cb { |
| 211 | unsigned int origlen; |
| 212 | union { |
| 213 | struct sockaddr_pkt pkt; |
| 214 | struct sockaddr_ll ll; |
| 215 | } sa; |
| 216 | }; |
| 217 | |
| 218 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 219 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | #ifdef CONFIG_PACKET_MMAP |
| 221 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 222 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
| 223 | { |
| 224 | union { |
| 225 | struct tpacket_hdr *h1; |
| 226 | struct tpacket2_hdr *h2; |
| 227 | void *raw; |
| 228 | } h; |
| 229 | |
| 230 | h.raw = frame; |
| 231 | switch (po->tp_version) { |
| 232 | case TPACKET_V1: |
| 233 | h.h1->tp_status = status; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 234 | flush_dcache_page(virt_to_page(&h.h1->tp_status)); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 235 | break; |
| 236 | case TPACKET_V2: |
| 237 | h.h2->tp_status = status; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 238 | flush_dcache_page(virt_to_page(&h.h2->tp_status)); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 239 | break; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 240 | default: |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 241 | pr_err("TPACKET version not supported\n"); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 242 | BUG(); |
| 243 | } |
| 244 | |
| 245 | smp_wmb(); |
| 246 | } |
| 247 | |
| 248 | static int __packet_get_status(struct packet_sock *po, void *frame) |
| 249 | { |
| 250 | union { |
| 251 | struct tpacket_hdr *h1; |
| 252 | struct tpacket2_hdr *h2; |
| 253 | void *raw; |
| 254 | } h; |
| 255 | |
| 256 | smp_rmb(); |
| 257 | |
| 258 | h.raw = frame; |
| 259 | switch (po->tp_version) { |
| 260 | case TPACKET_V1: |
| 261 | flush_dcache_page(virt_to_page(&h.h1->tp_status)); |
| 262 | return h.h1->tp_status; |
| 263 | case TPACKET_V2: |
| 264 | flush_dcache_page(virt_to_page(&h.h2->tp_status)); |
| 265 | return h.h2->tp_status; |
| 266 | default: |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 267 | pr_err("TPACKET version not supported\n"); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 268 | BUG(); |
| 269 | return 0; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 270 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 272 | |
| 273 | static void *packet_lookup_frame(struct packet_sock *po, |
| 274 | struct packet_ring_buffer *rb, |
| 275 | unsigned int position, |
| 276 | int status) |
| 277 | { |
| 278 | unsigned int pg_vec_pos, frame_offset; |
| 279 | union { |
| 280 | struct tpacket_hdr *h1; |
| 281 | struct tpacket2_hdr *h2; |
| 282 | void *raw; |
| 283 | } h; |
| 284 | |
| 285 | pg_vec_pos = position / rb->frames_per_block; |
| 286 | frame_offset = position % rb->frames_per_block; |
| 287 | |
| 288 | h.raw = rb->pg_vec[pg_vec_pos] + (frame_offset * rb->frame_size); |
| 289 | |
| 290 | if (status != __packet_get_status(po, h.raw)) |
| 291 | return NULL; |
| 292 | |
| 293 | return h.raw; |
| 294 | } |
| 295 | |
| 296 | static inline void *packet_current_frame(struct packet_sock *po, |
| 297 | struct packet_ring_buffer *rb, |
| 298 | int status) |
| 299 | { |
| 300 | return packet_lookup_frame(po, rb, rb->head, status); |
| 301 | } |
| 302 | |
| 303 | static inline void *packet_previous_frame(struct packet_sock *po, |
| 304 | struct packet_ring_buffer *rb, |
| 305 | int status) |
| 306 | { |
| 307 | unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; |
| 308 | return packet_lookup_frame(po, rb, previous, status); |
| 309 | } |
| 310 | |
| 311 | static inline void packet_increment_head(struct packet_ring_buffer *buff) |
| 312 | { |
| 313 | buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; |
| 314 | } |
| 315 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | #endif |
| 317 | |
| 318 | static inline struct packet_sock *pkt_sk(struct sock *sk) |
| 319 | { |
| 320 | return (struct packet_sock *)sk; |
| 321 | } |
| 322 | |
| 323 | static void packet_sock_destruct(struct sock *sk) |
| 324 | { |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 325 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
| 326 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | |
| 328 | if (!sock_flag(sk, SOCK_DEAD)) { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 329 | pr_err("Attempt to release alive packet socket: %p\n", sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | return; |
| 331 | } |
| 332 | |
Pavel Emelyanov | 17ab56a | 2007-11-10 21:38:48 -0800 | [diff] [blame] | 333 | sk_refcnt_debug_dec(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | } |
| 335 | |
| 336 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 337 | static const struct proto_ops packet_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 339 | static const struct proto_ops packet_ops_spkt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 341 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
| 342 | struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | { |
| 344 | struct sock *sk; |
| 345 | struct sockaddr_pkt *spkt; |
| 346 | |
| 347 | /* |
| 348 | * When we registered the protocol we saved the socket in the data |
| 349 | * field for just this event. |
| 350 | */ |
| 351 | |
| 352 | sk = pt->af_packet_priv; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 353 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | /* |
| 355 | * Yank back the headers [hope the device set this |
| 356 | * right or kerboom...] |
| 357 | * |
| 358 | * Incoming packets have ll header pulled, |
| 359 | * push it back. |
| 360 | * |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 361 | * For outgoing ones skb->data == skb_mac_header(skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | * so that this procedure is noop. |
| 363 | */ |
| 364 | |
| 365 | if (skb->pkt_type == PACKET_LOOPBACK) |
| 366 | goto out; |
| 367 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 368 | if (!net_eq(dev_net(dev), sock_net(sk))) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 369 | goto out; |
| 370 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 371 | skb = skb_share_check(skb, GFP_ATOMIC); |
| 372 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | goto oom; |
| 374 | |
| 375 | /* drop any routing info */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 376 | skb_dst_drop(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | |
Phil Oester | 84531c2 | 2005-07-12 11:57:52 -0700 | [diff] [blame] | 378 | /* drop conntrack reference */ |
| 379 | nf_reset(skb); |
| 380 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 381 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 383 | skb_push(skb, skb->data - skb_mac_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
| 385 | /* |
| 386 | * The SOCK_PACKET socket receives _all_ frames. |
| 387 | */ |
| 388 | |
| 389 | spkt->spkt_family = dev->type; |
| 390 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); |
| 391 | spkt->spkt_protocol = skb->protocol; |
| 392 | |
| 393 | /* |
| 394 | * Charge the memory to the socket. This is done specifically |
| 395 | * to prevent sockets using all the memory up. |
| 396 | */ |
| 397 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 398 | if (sock_queue_rcv_skb(sk, skb) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | return 0; |
| 400 | |
| 401 | out: |
| 402 | kfree_skb(skb); |
| 403 | oom: |
| 404 | return 0; |
| 405 | } |
| 406 | |
| 407 | |
| 408 | /* |
| 409 | * Output a raw packet to a device layer. This bypasses all the other |
| 410 | * protocol layers and you must therefore supply it with a complete frame |
| 411 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 412 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, |
| 414 | struct msghdr *msg, size_t len) |
| 415 | { |
| 416 | struct sock *sk = sock->sk; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 417 | struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | struct sk_buff *skb; |
| 419 | struct net_device *dev; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 420 | __be16 proto = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | int err; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 422 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 424 | * Get and verify the address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | */ |
| 426 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 427 | if (saddr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 429 | return -EINVAL; |
| 430 | if (msg->msg_namelen == sizeof(struct sockaddr_pkt)) |
| 431 | proto = saddr->spkt_protocol; |
| 432 | } else |
| 433 | return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | |
| 435 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 436 | * Find the device first to size check it |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | */ |
| 438 | |
| 439 | saddr->spkt_device[13] = 0; |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 440 | rcu_read_lock(); |
| 441 | dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | err = -ENODEV; |
| 443 | if (dev == NULL) |
| 444 | goto out_unlock; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 445 | |
David S. Miller | d5e76b0 | 2007-01-25 19:30:36 -0800 | [diff] [blame] | 446 | err = -ENETDOWN; |
| 447 | if (!(dev->flags & IFF_UP)) |
| 448 | goto out_unlock; |
| 449 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | /* |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 451 | * You may not queue a frame bigger than the mtu. This is the lowest level |
| 452 | * raw protocol and you must do your own fragmentation at this level. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 454 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | err = -EMSGSIZE; |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 456 | if (len > dev->mtu + dev->hard_header_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | goto out_unlock; |
| 458 | |
| 459 | err = -ENOBUFS; |
| 460 | skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL); |
| 461 | |
| 462 | /* |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 463 | * If the write buffer is full, then tough. At this level the user |
| 464 | * gets to deal with the problem - do your own algorithmic backoffs. |
| 465 | * That's far more flexible. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 467 | |
| 468 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | goto out_unlock; |
| 470 | |
| 471 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 472 | * Fill it in |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 474 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | /* FIXME: Save some space for broken drivers that write a |
| 476 | * hard header at transmission time by themselves. PPP is the |
| 477 | * notable one here. This should really be fixed at the driver level. |
| 478 | */ |
| 479 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 480 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | |
| 482 | /* Try to align data part correctly */ |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 483 | if (dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | skb->data -= dev->hard_header_len; |
| 485 | skb->tail -= dev->hard_header_len; |
| 486 | if (len < dev->hard_header_len) |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 487 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | } |
| 489 | |
| 490 | /* Returns -EFAULT on error */ |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 491 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | skb->protocol = proto; |
| 493 | skb->dev = dev; |
| 494 | skb->priority = sk->sk_priority; |
Eric Dumazet | 2d37a18 | 2009-10-01 19:14:46 +0000 | [diff] [blame] | 495 | skb->mark = sk->sk_mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | if (err) |
| 497 | goto out_free; |
| 498 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | /* |
| 500 | * Now send it |
| 501 | */ |
| 502 | |
| 503 | dev_queue_xmit(skb); |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 504 | rcu_read_unlock(); |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 505 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
| 507 | out_free: |
| 508 | kfree_skb(skb); |
| 509 | out_unlock: |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 510 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | return err; |
| 512 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 514 | static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk, |
| 515 | unsigned int res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | { |
| 517 | struct sk_filter *filter; |
| 518 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 519 | rcu_read_lock_bh(); |
| 520 | filter = rcu_dereference(sk->sk_filter); |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 521 | if (filter != NULL) |
| 522 | res = sk_run_filter(skb, filter->insns, filter->len); |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 523 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 525 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | } |
| 527 | |
| 528 | /* |
| 529 | This function makes lazy skb cloning in hope that most of packets |
| 530 | are discarded by BPF. |
| 531 | |
| 532 | Note tricky part: we DO mangle shared skb! skb->data, skb->len |
| 533 | and skb->cb are mangled. It works because (and until) packets |
| 534 | falling here are owned by current CPU. Output packets are cloned |
| 535 | by dev_queue_xmit_nit(), input packets are processed by net_bh |
| 536 | sequencially, so that if we return skb to original state on exit, |
| 537 | we will not harm anyone. |
| 538 | */ |
| 539 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 540 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
| 541 | struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | { |
| 543 | struct sock *sk; |
| 544 | struct sockaddr_ll *sll; |
| 545 | struct packet_sock *po; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 546 | u8 *skb_head = skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | int skb_len = skb->len; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 548 | unsigned int snaplen, res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | |
| 550 | if (skb->pkt_type == PACKET_LOOPBACK) |
| 551 | goto drop; |
| 552 | |
| 553 | sk = pt->af_packet_priv; |
| 554 | po = pkt_sk(sk); |
| 555 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 556 | if (!net_eq(dev_net(dev), sock_net(sk))) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 557 | goto drop; |
| 558 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | skb->dev = dev; |
| 560 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 561 | if (dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | /* The device has an explicit notion of ll header, |
| 563 | exported to higher levels. |
| 564 | |
| 565 | Otherwise, the device hides datails of it frame |
| 566 | structure, so that corresponding packet head |
| 567 | never delivered to user. |
| 568 | */ |
| 569 | if (sk->sk_type != SOCK_DGRAM) |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 570 | skb_push(skb, skb->data - skb_mac_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | else if (skb->pkt_type == PACKET_OUTGOING) { |
| 572 | /* Special case: outgoing packets have ll header at head */ |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 573 | skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | } |
| 575 | } |
| 576 | |
| 577 | snaplen = skb->len; |
| 578 | |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 579 | res = run_filter(skb, sk, snaplen); |
| 580 | if (!res) |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 581 | goto drop_n_restore; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 582 | if (snaplen > res) |
| 583 | snaplen = res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | |
| 585 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= |
| 586 | (unsigned)sk->sk_rcvbuf) |
| 587 | goto drop_n_acct; |
| 588 | |
| 589 | if (skb_shared(skb)) { |
| 590 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); |
| 591 | if (nskb == NULL) |
| 592 | goto drop_n_acct; |
| 593 | |
| 594 | if (skb_head != skb->data) { |
| 595 | skb->data = skb_head; |
| 596 | skb->len = skb_len; |
| 597 | } |
| 598 | kfree_skb(skb); |
| 599 | skb = nskb; |
| 600 | } |
| 601 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 602 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
| 603 | sizeof(skb->cb)); |
| 604 | |
| 605 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | sll->sll_family = AF_PACKET; |
| 607 | sll->sll_hatype = dev->type; |
| 608 | sll->sll_protocol = skb->protocol; |
| 609 | sll->sll_pkttype = skb->pkt_type; |
Peter P Waskiewicz Jr | 8032b46 | 2007-11-10 22:03:25 -0800 | [diff] [blame] | 610 | if (unlikely(po->origdev)) |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 611 | sll->sll_ifindex = orig_dev->ifindex; |
| 612 | else |
| 613 | sll->sll_ifindex = dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 615 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 617 | PACKET_SKB_CB(skb)->origlen = skb->len; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 618 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | if (pskb_trim(skb, snaplen)) |
| 620 | goto drop_n_acct; |
| 621 | |
| 622 | skb_set_owner_r(skb, sk); |
| 623 | skb->dev = NULL; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 624 | skb_dst_drop(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
Phil Oester | 84531c2 | 2005-07-12 11:57:52 -0700 | [diff] [blame] | 626 | /* drop conntrack reference */ |
| 627 | nf_reset(skb); |
| 628 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | spin_lock(&sk->sk_receive_queue.lock); |
| 630 | po->stats.tp_packets++; |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 631 | skb->dropcount = atomic_read(&sk->sk_drops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
| 633 | spin_unlock(&sk->sk_receive_queue.lock); |
| 634 | sk->sk_data_ready(sk, skb->len); |
| 635 | return 0; |
| 636 | |
| 637 | drop_n_acct: |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 638 | po->stats.tp_drops = atomic_inc_return(&sk->sk_drops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
| 640 | drop_n_restore: |
| 641 | if (skb_head != skb->data && skb_shared(skb)) { |
| 642 | skb->data = skb_head; |
| 643 | skb->len = skb_len; |
| 644 | } |
| 645 | drop: |
Neil Horman | ead2ceb | 2009-03-11 09:49:55 +0000 | [diff] [blame] | 646 | consume_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | return 0; |
| 648 | } |
| 649 | |
| 650 | #ifdef CONFIG_PACKET_MMAP |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 651 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
| 652 | struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | { |
| 654 | struct sock *sk; |
| 655 | struct packet_sock *po; |
| 656 | struct sockaddr_ll *sll; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 657 | union { |
| 658 | struct tpacket_hdr *h1; |
| 659 | struct tpacket2_hdr *h2; |
| 660 | void *raw; |
| 661 | } h; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 662 | u8 *skb_head = skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | int skb_len = skb->len; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 664 | unsigned int snaplen, res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 666 | unsigned short macoff, netoff, hdrlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | struct sk_buff *copy_skb = NULL; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 668 | struct timeval tv; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 669 | struct timespec ts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | |
| 671 | if (skb->pkt_type == PACKET_LOOPBACK) |
| 672 | goto drop; |
| 673 | |
| 674 | sk = pt->af_packet_priv; |
| 675 | po = pkt_sk(sk); |
| 676 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 677 | if (!net_eq(dev_net(dev), sock_net(sk))) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 678 | goto drop; |
| 679 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 680 | if (dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | if (sk->sk_type != SOCK_DGRAM) |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 682 | skb_push(skb, skb->data - skb_mac_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | else if (skb->pkt_type == PACKET_OUTGOING) { |
| 684 | /* Special case: outgoing packets have ll header at head */ |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 685 | skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | } |
| 687 | } |
| 688 | |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 689 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
| 690 | status |= TP_STATUS_CSUMNOTREADY; |
| 691 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | snaplen = skb->len; |
| 693 | |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 694 | res = run_filter(skb, sk, snaplen); |
| 695 | if (!res) |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 696 | goto drop_n_restore; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 697 | if (snaplen > res) |
| 698 | snaplen = res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | |
| 700 | if (sk->sk_type == SOCK_DGRAM) { |
Patrick McHardy | 8913336 | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 701 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
| 702 | po->tp_reserve; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | } else { |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 704 | unsigned maclen = skb_network_offset(skb); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 705 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
Patrick McHardy | 8913336 | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 706 | (maclen < 16 ? 16 : maclen)) + |
| 707 | po->tp_reserve; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | macoff = netoff - maclen; |
| 709 | } |
| 710 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 711 | if (macoff + snaplen > po->rx_ring.frame_size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | if (po->copy_thresh && |
| 713 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < |
| 714 | (unsigned)sk->sk_rcvbuf) { |
| 715 | if (skb_shared(skb)) { |
| 716 | copy_skb = skb_clone(skb, GFP_ATOMIC); |
| 717 | } else { |
| 718 | copy_skb = skb_get(skb); |
| 719 | skb_head = skb->data; |
| 720 | } |
| 721 | if (copy_skb) |
| 722 | skb_set_owner_r(copy_skb, sk); |
| 723 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 724 | snaplen = po->rx_ring.frame_size - macoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | if ((int)snaplen < 0) |
| 726 | snaplen = 0; |
| 727 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | |
| 729 | spin_lock(&sk->sk_receive_queue.lock); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 730 | h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 731 | if (!h.raw) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | goto ring_is_full; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 733 | packet_increment_head(&po->rx_ring); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | po->stats.tp_packets++; |
| 735 | if (copy_skb) { |
| 736 | status |= TP_STATUS_COPY; |
| 737 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); |
| 738 | } |
| 739 | if (!po->stats.tp_drops) |
| 740 | status &= ~TP_STATUS_LOSING; |
| 741 | spin_unlock(&sk->sk_receive_queue.lock); |
| 742 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 743 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 745 | switch (po->tp_version) { |
| 746 | case TPACKET_V1: |
| 747 | h.h1->tp_len = skb->len; |
| 748 | h.h1->tp_snaplen = snaplen; |
| 749 | h.h1->tp_mac = macoff; |
| 750 | h.h1->tp_net = netoff; |
| 751 | if (skb->tstamp.tv64) |
| 752 | tv = ktime_to_timeval(skb->tstamp); |
| 753 | else |
| 754 | do_gettimeofday(&tv); |
| 755 | h.h1->tp_sec = tv.tv_sec; |
| 756 | h.h1->tp_usec = tv.tv_usec; |
| 757 | hdrlen = sizeof(*h.h1); |
| 758 | break; |
| 759 | case TPACKET_V2: |
| 760 | h.h2->tp_len = skb->len; |
| 761 | h.h2->tp_snaplen = snaplen; |
| 762 | h.h2->tp_mac = macoff; |
| 763 | h.h2->tp_net = netoff; |
| 764 | if (skb->tstamp.tv64) |
| 765 | ts = ktime_to_timespec(skb->tstamp); |
| 766 | else |
| 767 | getnstimeofday(&ts); |
| 768 | h.h2->tp_sec = ts.tv_sec; |
| 769 | h.h2->tp_nsec = ts.tv_nsec; |
Eric Dumazet | 05423b2 | 2009-10-26 18:40:35 -0700 | [diff] [blame] | 770 | h.h2->tp_vlan_tci = vlan_tx_tag_get(skb); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 771 | hdrlen = sizeof(*h.h2); |
| 772 | break; |
| 773 | default: |
| 774 | BUG(); |
| 775 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 777 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 778 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | sll->sll_family = AF_PACKET; |
| 780 | sll->sll_hatype = dev->type; |
| 781 | sll->sll_protocol = skb->protocol; |
| 782 | sll->sll_pkttype = skb->pkt_type; |
Peter P Waskiewicz Jr | 8032b46 | 2007-11-10 22:03:25 -0800 | [diff] [blame] | 783 | if (unlikely(po->origdev)) |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 784 | sll->sll_ifindex = orig_dev->ifindex; |
| 785 | else |
| 786 | sll->sll_ifindex = dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 788 | __packet_set_status(po, h.raw, status); |
Ralf Baechle | e16aa20 | 2006-12-07 00:11:33 -0800 | [diff] [blame] | 789 | smp_mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | { |
| 791 | struct page *p_start, *p_end; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 792 | u8 *h_end = h.raw + macoff + snaplen - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 794 | p_start = virt_to_page(h.raw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | p_end = virt_to_page(h_end); |
| 796 | while (p_start <= p_end) { |
| 797 | flush_dcache_page(p_start); |
| 798 | p_start++; |
| 799 | } |
| 800 | } |
| 801 | |
| 802 | sk->sk_data_ready(sk, 0); |
| 803 | |
| 804 | drop_n_restore: |
| 805 | if (skb_head != skb->data && skb_shared(skb)) { |
| 806 | skb->data = skb_head; |
| 807 | skb->len = skb_len; |
| 808 | } |
| 809 | drop: |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 810 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | return 0; |
| 812 | |
| 813 | ring_is_full: |
| 814 | po->stats.tp_drops++; |
| 815 | spin_unlock(&sk->sk_receive_queue.lock); |
| 816 | |
| 817 | sk->sk_data_ready(sk, 0); |
Wei Yongjun | acb5d75 | 2009-02-25 00:36:42 +0000 | [diff] [blame] | 818 | kfree_skb(copy_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | goto drop_n_restore; |
| 820 | } |
| 821 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 822 | static void tpacket_destruct_skb(struct sk_buff *skb) |
| 823 | { |
| 824 | struct packet_sock *po = pkt_sk(skb->sk); |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 825 | void *ph; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 826 | |
| 827 | BUG_ON(skb == NULL); |
| 828 | |
| 829 | if (likely(po->tx_ring.pg_vec)) { |
| 830 | ph = skb_shinfo(skb)->destructor_arg; |
| 831 | BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING); |
| 832 | BUG_ON(atomic_read(&po->tx_ring.pending) == 0); |
| 833 | atomic_dec(&po->tx_ring.pending); |
| 834 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE); |
| 835 | } |
| 836 | |
| 837 | sock_wfree(skb); |
| 838 | } |
| 839 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 840 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
| 841 | void *frame, struct net_device *dev, int size_max, |
| 842 | __be16 proto, unsigned char *addr) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 843 | { |
| 844 | union { |
| 845 | struct tpacket_hdr *h1; |
| 846 | struct tpacket2_hdr *h2; |
| 847 | void *raw; |
| 848 | } ph; |
| 849 | int to_write, offset, len, tp_len, nr_frags, len_max; |
| 850 | struct socket *sock = po->sk.sk_socket; |
| 851 | struct page *page; |
| 852 | void *data; |
| 853 | int err; |
| 854 | |
| 855 | ph.raw = frame; |
| 856 | |
| 857 | skb->protocol = proto; |
| 858 | skb->dev = dev; |
| 859 | skb->priority = po->sk.sk_priority; |
Eric Dumazet | 2d37a18 | 2009-10-01 19:14:46 +0000 | [diff] [blame] | 860 | skb->mark = po->sk.sk_mark; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 861 | skb_shinfo(skb)->destructor_arg = ph.raw; |
| 862 | |
| 863 | switch (po->tp_version) { |
| 864 | case TPACKET_V2: |
| 865 | tp_len = ph.h2->tp_len; |
| 866 | break; |
| 867 | default: |
| 868 | tp_len = ph.h1->tp_len; |
| 869 | break; |
| 870 | } |
| 871 | if (unlikely(tp_len > size_max)) { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 872 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 873 | return -EMSGSIZE; |
| 874 | } |
| 875 | |
| 876 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
| 877 | skb_reset_network_header(skb); |
| 878 | |
| 879 | data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll); |
| 880 | to_write = tp_len; |
| 881 | |
| 882 | if (sock->type == SOCK_DGRAM) { |
| 883 | err = dev_hard_header(skb, dev, ntohs(proto), addr, |
| 884 | NULL, tp_len); |
| 885 | if (unlikely(err < 0)) |
| 886 | return -EINVAL; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 887 | } else if (dev->hard_header_len) { |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 888 | /* net device doesn't like empty head */ |
| 889 | if (unlikely(tp_len <= dev->hard_header_len)) { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 890 | pr_err("packet size is too short (%d < %d)\n", |
| 891 | tp_len, dev->hard_header_len); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 892 | return -EINVAL; |
| 893 | } |
| 894 | |
| 895 | skb_push(skb, dev->hard_header_len); |
| 896 | err = skb_store_bits(skb, 0, data, |
| 897 | dev->hard_header_len); |
| 898 | if (unlikely(err)) |
| 899 | return err; |
| 900 | |
| 901 | data += dev->hard_header_len; |
| 902 | to_write -= dev->hard_header_len; |
| 903 | } |
| 904 | |
| 905 | err = -EFAULT; |
| 906 | page = virt_to_page(data); |
| 907 | offset = offset_in_page(data); |
| 908 | len_max = PAGE_SIZE - offset; |
| 909 | len = ((to_write > len_max) ? len_max : to_write); |
| 910 | |
| 911 | skb->data_len = to_write; |
| 912 | skb->len += to_write; |
| 913 | skb->truesize += to_write; |
| 914 | atomic_add(to_write, &po->sk.sk_wmem_alloc); |
| 915 | |
| 916 | while (likely(to_write)) { |
| 917 | nr_frags = skb_shinfo(skb)->nr_frags; |
| 918 | |
| 919 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 920 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
| 921 | MAX_SKB_FRAGS); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 922 | return -EFAULT; |
| 923 | } |
| 924 | |
| 925 | flush_dcache_page(page); |
| 926 | get_page(page); |
| 927 | skb_fill_page_desc(skb, |
| 928 | nr_frags, |
| 929 | page++, offset, len); |
| 930 | to_write -= len; |
| 931 | offset = 0; |
| 932 | len_max = PAGE_SIZE; |
| 933 | len = ((to_write > len_max) ? len_max : to_write); |
| 934 | } |
| 935 | |
| 936 | return tp_len; |
| 937 | } |
| 938 | |
| 939 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) |
| 940 | { |
| 941 | struct socket *sock; |
| 942 | struct sk_buff *skb; |
| 943 | struct net_device *dev; |
| 944 | __be16 proto; |
| 945 | int ifindex, err, reserve = 0; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 946 | void *ph; |
| 947 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 948 | int tp_len, size_max; |
| 949 | unsigned char *addr; |
| 950 | int len_sum = 0; |
| 951 | int status = 0; |
| 952 | |
| 953 | sock = po->sk.sk_socket; |
| 954 | |
| 955 | mutex_lock(&po->pg_vec_lock); |
| 956 | |
| 957 | err = -EBUSY; |
| 958 | if (saddr == NULL) { |
| 959 | ifindex = po->ifindex; |
| 960 | proto = po->num; |
| 961 | addr = NULL; |
| 962 | } else { |
| 963 | err = -EINVAL; |
| 964 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) |
| 965 | goto out; |
| 966 | if (msg->msg_namelen < (saddr->sll_halen |
| 967 | + offsetof(struct sockaddr_ll, |
| 968 | sll_addr))) |
| 969 | goto out; |
| 970 | ifindex = saddr->sll_ifindex; |
| 971 | proto = saddr->sll_protocol; |
| 972 | addr = saddr->sll_addr; |
| 973 | } |
| 974 | |
| 975 | dev = dev_get_by_index(sock_net(&po->sk), ifindex); |
| 976 | err = -ENXIO; |
| 977 | if (unlikely(dev == NULL)) |
| 978 | goto out; |
| 979 | |
| 980 | reserve = dev->hard_header_len; |
| 981 | |
| 982 | err = -ENETDOWN; |
| 983 | if (unlikely(!(dev->flags & IFF_UP))) |
| 984 | goto out_put; |
| 985 | |
| 986 | size_max = po->tx_ring.frame_size |
Gabor Gombas | b5dd884 | 2009-10-29 03:19:11 -0700 | [diff] [blame] | 987 | - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 988 | |
| 989 | if (size_max > dev->mtu + reserve) |
| 990 | size_max = dev->mtu + reserve; |
| 991 | |
| 992 | do { |
| 993 | ph = packet_current_frame(po, &po->tx_ring, |
| 994 | TP_STATUS_SEND_REQUEST); |
| 995 | |
| 996 | if (unlikely(ph == NULL)) { |
| 997 | schedule(); |
| 998 | continue; |
| 999 | } |
| 1000 | |
| 1001 | status = TP_STATUS_SEND_REQUEST; |
| 1002 | skb = sock_alloc_send_skb(&po->sk, |
| 1003 | LL_ALLOCATED_SPACE(dev) |
| 1004 | + sizeof(struct sockaddr_ll), |
| 1005 | 0, &err); |
| 1006 | |
| 1007 | if (unlikely(skb == NULL)) |
| 1008 | goto out_status; |
| 1009 | |
| 1010 | tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto, |
| 1011 | addr); |
| 1012 | |
| 1013 | if (unlikely(tp_len < 0)) { |
| 1014 | if (po->tp_loss) { |
| 1015 | __packet_set_status(po, ph, |
| 1016 | TP_STATUS_AVAILABLE); |
| 1017 | packet_increment_head(&po->tx_ring); |
| 1018 | kfree_skb(skb); |
| 1019 | continue; |
| 1020 | } else { |
| 1021 | status = TP_STATUS_WRONG_FORMAT; |
| 1022 | err = tp_len; |
| 1023 | goto out_status; |
| 1024 | } |
| 1025 | } |
| 1026 | |
| 1027 | skb->destructor = tpacket_destruct_skb; |
| 1028 | __packet_set_status(po, ph, TP_STATUS_SENDING); |
| 1029 | atomic_inc(&po->tx_ring.pending); |
| 1030 | |
| 1031 | status = TP_STATUS_SEND_REQUEST; |
| 1032 | err = dev_queue_xmit(skb); |
| 1033 | if (unlikely(err > 0 && (err = net_xmit_errno(err)) != 0)) |
| 1034 | goto out_xmit; |
| 1035 | packet_increment_head(&po->tx_ring); |
| 1036 | len_sum += tp_len; |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame^] | 1037 | } while (likely((ph != NULL) || |
| 1038 | ((!(msg->msg_flags & MSG_DONTWAIT)) && |
| 1039 | (atomic_read(&po->tx_ring.pending)))) |
| 1040 | ); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1041 | |
| 1042 | err = len_sum; |
| 1043 | goto out_put; |
| 1044 | |
| 1045 | out_xmit: |
| 1046 | skb->destructor = sock_wfree; |
| 1047 | atomic_dec(&po->tx_ring.pending); |
| 1048 | out_status: |
| 1049 | __packet_set_status(po, ph, status); |
| 1050 | kfree_skb(skb); |
| 1051 | out_put: |
| 1052 | dev_put(dev); |
| 1053 | out: |
| 1054 | mutex_unlock(&po->pg_vec_lock); |
| 1055 | return err; |
| 1056 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | #endif |
| 1058 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1059 | static int packet_snd(struct socket *sock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | struct msghdr *msg, size_t len) |
| 1061 | { |
| 1062 | struct sock *sk = sock->sk; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1063 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | struct sk_buff *skb; |
| 1065 | struct net_device *dev; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 1066 | __be16 proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | unsigned char *addr; |
| 1068 | int ifindex, err, reserve = 0; |
| 1069 | |
| 1070 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1071 | * Get and verify the address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1073 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | if (saddr == NULL) { |
| 1075 | struct packet_sock *po = pkt_sk(sk); |
| 1076 | |
| 1077 | ifindex = po->ifindex; |
| 1078 | proto = po->num; |
| 1079 | addr = NULL; |
| 1080 | } else { |
| 1081 | err = -EINVAL; |
| 1082 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) |
| 1083 | goto out; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1084 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
| 1085 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | ifindex = saddr->sll_ifindex; |
| 1087 | proto = saddr->sll_protocol; |
| 1088 | addr = saddr->sll_addr; |
| 1089 | } |
| 1090 | |
| 1091 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1092 | dev = dev_get_by_index(sock_net(sk), ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | err = -ENXIO; |
| 1094 | if (dev == NULL) |
| 1095 | goto out_unlock; |
| 1096 | if (sock->type == SOCK_RAW) |
| 1097 | reserve = dev->hard_header_len; |
| 1098 | |
David S. Miller | d5e76b0 | 2007-01-25 19:30:36 -0800 | [diff] [blame] | 1099 | err = -ENETDOWN; |
| 1100 | if (!(dev->flags & IFF_UP)) |
| 1101 | goto out_unlock; |
| 1102 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | err = -EMSGSIZE; |
| 1104 | if (len > dev->mtu+reserve) |
| 1105 | goto out_unlock; |
| 1106 | |
Johannes Berg | f5184d2 | 2008-05-12 20:48:31 -0700 | [diff] [blame] | 1107 | skb = sock_alloc_send_skb(sk, len + LL_ALLOCATED_SPACE(dev), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | msg->msg_flags & MSG_DONTWAIT, &err); |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1109 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | goto out_unlock; |
| 1111 | |
| 1112 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 1113 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 1115 | err = -EINVAL; |
| 1116 | if (sock->type == SOCK_DGRAM && |
| 1117 | dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len) < 0) |
| 1118 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | |
| 1120 | /* Returns -EFAULT on error */ |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1121 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | if (err) |
| 1123 | goto out_free; |
| 1124 | |
| 1125 | skb->protocol = proto; |
| 1126 | skb->dev = dev; |
| 1127 | skb->priority = sk->sk_priority; |
Eric Dumazet | 2d37a18 | 2009-10-01 19:14:46 +0000 | [diff] [blame] | 1128 | skb->mark = sk->sk_mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | /* |
| 1131 | * Now send it |
| 1132 | */ |
| 1133 | |
| 1134 | err = dev_queue_xmit(skb); |
| 1135 | if (err > 0 && (err = net_xmit_errno(err)) != 0) |
| 1136 | goto out_unlock; |
| 1137 | |
| 1138 | dev_put(dev); |
| 1139 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1140 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | |
| 1142 | out_free: |
| 1143 | kfree_skb(skb); |
| 1144 | out_unlock: |
| 1145 | if (dev) |
| 1146 | dev_put(dev); |
| 1147 | out: |
| 1148 | return err; |
| 1149 | } |
| 1150 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1151 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
| 1152 | struct msghdr *msg, size_t len) |
| 1153 | { |
| 1154 | #ifdef CONFIG_PACKET_MMAP |
| 1155 | struct sock *sk = sock->sk; |
| 1156 | struct packet_sock *po = pkt_sk(sk); |
| 1157 | if (po->tx_ring.pg_vec) |
| 1158 | return tpacket_snd(po, msg); |
| 1159 | else |
| 1160 | #endif |
| 1161 | return packet_snd(sock, msg, len); |
| 1162 | } |
| 1163 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | /* |
| 1165 | * Close a PACKET socket. This is fairly simple. We immediately go |
| 1166 | * to 'closed' state and remove our protocol entry in the device list. |
| 1167 | */ |
| 1168 | |
| 1169 | static int packet_release(struct socket *sock) |
| 1170 | { |
| 1171 | struct sock *sk = sock->sk; |
| 1172 | struct packet_sock *po; |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 1173 | struct net *net; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1174 | #ifdef CONFIG_PACKET_MMAP |
| 1175 | struct tpacket_req req; |
| 1176 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | |
| 1178 | if (!sk) |
| 1179 | return 0; |
| 1180 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1181 | net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | po = pkt_sk(sk); |
| 1183 | |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 1184 | write_lock_bh(&net->packet.sklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | sk_del_node_init(sk); |
Eric Dumazet | 920de80 | 2008-11-24 00:09:29 -0800 | [diff] [blame] | 1186 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 1187 | write_unlock_bh(&net->packet.sklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | |
| 1189 | /* |
| 1190 | * Unhook packet receive handler. |
| 1191 | */ |
| 1192 | |
| 1193 | if (po->running) { |
| 1194 | /* |
| 1195 | * Remove the protocol hook |
| 1196 | */ |
| 1197 | dev_remove_pack(&po->prot_hook); |
| 1198 | po->running = 0; |
| 1199 | po->num = 0; |
| 1200 | __sock_put(sk); |
| 1201 | } |
| 1202 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | packet_flush_mclist(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | |
| 1205 | #ifdef CONFIG_PACKET_MMAP |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1206 | memset(&req, 0, sizeof(req)); |
| 1207 | |
| 1208 | if (po->rx_ring.pg_vec) |
| 1209 | packet_set_ring(sk, &req, 1, 0); |
| 1210 | |
| 1211 | if (po->tx_ring.pg_vec) |
| 1212 | packet_set_ring(sk, &req, 1, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | #endif |
| 1214 | |
| 1215 | /* |
| 1216 | * Now the socket is dead. No more input will appear. |
| 1217 | */ |
| 1218 | |
| 1219 | sock_orphan(sk); |
| 1220 | sock->sk = NULL; |
| 1221 | |
| 1222 | /* Purge queues */ |
| 1223 | |
| 1224 | skb_queue_purge(&sk->sk_receive_queue); |
Pavel Emelyanov | 17ab56a | 2007-11-10 21:38:48 -0800 | [diff] [blame] | 1225 | sk_refcnt_debug_release(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | |
| 1227 | sock_put(sk); |
| 1228 | return 0; |
| 1229 | } |
| 1230 | |
| 1231 | /* |
| 1232 | * Attach a packet hook. |
| 1233 | */ |
| 1234 | |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 1235 | 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] | 1236 | { |
| 1237 | struct packet_sock *po = pkt_sk(sk); |
| 1238 | /* |
| 1239 | * Detach an existing hook if present. |
| 1240 | */ |
| 1241 | |
| 1242 | lock_sock(sk); |
| 1243 | |
| 1244 | spin_lock(&po->bind_lock); |
| 1245 | if (po->running) { |
| 1246 | __sock_put(sk); |
| 1247 | po->running = 0; |
| 1248 | po->num = 0; |
| 1249 | spin_unlock(&po->bind_lock); |
| 1250 | dev_remove_pack(&po->prot_hook); |
| 1251 | spin_lock(&po->bind_lock); |
| 1252 | } |
| 1253 | |
| 1254 | po->num = protocol; |
| 1255 | po->prot_hook.type = protocol; |
| 1256 | po->prot_hook.dev = dev; |
| 1257 | |
| 1258 | po->ifindex = dev ? dev->ifindex : 0; |
| 1259 | |
| 1260 | if (protocol == 0) |
| 1261 | goto out_unlock; |
| 1262 | |
Urs Thuermann | be85d4a | 2007-11-12 21:05:20 -0800 | [diff] [blame] | 1263 | if (!dev || (dev->flags & IFF_UP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | dev_add_pack(&po->prot_hook); |
| 1265 | sock_hold(sk); |
| 1266 | po->running = 1; |
Urs Thuermann | be85d4a | 2007-11-12 21:05:20 -0800 | [diff] [blame] | 1267 | } else { |
| 1268 | sk->sk_err = ENETDOWN; |
| 1269 | if (!sock_flag(sk, SOCK_DEAD)) |
| 1270 | sk->sk_error_report(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1271 | } |
| 1272 | |
| 1273 | out_unlock: |
| 1274 | spin_unlock(&po->bind_lock); |
| 1275 | release_sock(sk); |
| 1276 | return 0; |
| 1277 | } |
| 1278 | |
| 1279 | /* |
| 1280 | * Bind a packet socket to a device |
| 1281 | */ |
| 1282 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1283 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
| 1284 | int addr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1286 | struct sock *sk = sock->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | char name[15]; |
| 1288 | struct net_device *dev; |
| 1289 | int err = -ENODEV; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1290 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | /* |
| 1292 | * Check legality |
| 1293 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1294 | |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 1295 | if (addr_len != sizeof(struct sockaddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | return -EINVAL; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1297 | strlcpy(name, uaddr->sa_data, sizeof(name)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1299 | dev = dev_get_by_name(sock_net(sk), name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | if (dev) { |
| 1301 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); |
| 1302 | dev_put(dev); |
| 1303 | } |
| 1304 | return err; |
| 1305 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | |
| 1307 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
| 1308 | { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1309 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
| 1310 | struct sock *sk = sock->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | struct net_device *dev = NULL; |
| 1312 | int err; |
| 1313 | |
| 1314 | |
| 1315 | /* |
| 1316 | * Check legality |
| 1317 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1318 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | if (addr_len < sizeof(struct sockaddr_ll)) |
| 1320 | return -EINVAL; |
| 1321 | if (sll->sll_family != AF_PACKET) |
| 1322 | return -EINVAL; |
| 1323 | |
| 1324 | if (sll->sll_ifindex) { |
| 1325 | err = -ENODEV; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1326 | dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | if (dev == NULL) |
| 1328 | goto out; |
| 1329 | } |
| 1330 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); |
| 1331 | if (dev) |
| 1332 | dev_put(dev); |
| 1333 | |
| 1334 | out: |
| 1335 | return err; |
| 1336 | } |
| 1337 | |
| 1338 | static struct proto packet_proto = { |
| 1339 | .name = "PACKET", |
| 1340 | .owner = THIS_MODULE, |
| 1341 | .obj_size = sizeof(struct packet_sock), |
| 1342 | }; |
| 1343 | |
| 1344 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1345 | * Create a packet of type SOCK_PACKET. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | */ |
| 1347 | |
Eric Paris | 3f378b6 | 2009-11-05 22:18:14 -0800 | [diff] [blame] | 1348 | static int packet_create(struct net *net, struct socket *sock, int protocol, |
| 1349 | int kern) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | { |
| 1351 | struct sock *sk; |
| 1352 | struct packet_sock *po; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 1353 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | int err; |
| 1355 | |
| 1356 | if (!capable(CAP_NET_RAW)) |
| 1357 | return -EPERM; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 1358 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
| 1359 | sock->type != SOCK_PACKET) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | return -ESOCKTNOSUPPORT; |
| 1361 | |
| 1362 | sock->state = SS_UNCONNECTED; |
| 1363 | |
| 1364 | err = -ENOBUFS; |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 1365 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | if (sk == NULL) |
| 1367 | goto out; |
| 1368 | |
| 1369 | sock->ops = &packet_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | if (sock->type == SOCK_PACKET) |
| 1371 | sock->ops = &packet_ops_spkt; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 1372 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | sock_init_data(sock, sk); |
| 1374 | |
| 1375 | po = pkt_sk(sk); |
| 1376 | sk->sk_family = PF_PACKET; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 1377 | po->num = proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | |
| 1379 | sk->sk_destruct = packet_sock_destruct; |
Pavel Emelyanov | 17ab56a | 2007-11-10 21:38:48 -0800 | [diff] [blame] | 1380 | sk_refcnt_debug_inc(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | |
| 1382 | /* |
| 1383 | * Attach a protocol block |
| 1384 | */ |
| 1385 | |
| 1386 | spin_lock_init(&po->bind_lock); |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 1387 | mutex_init(&po->pg_vec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | po->prot_hook.func = packet_rcv; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 1389 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | if (sock->type == SOCK_PACKET) |
| 1391 | po->prot_hook.func = packet_rcv_spkt; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 1392 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | po->prot_hook.af_packet_priv = sk; |
| 1394 | |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 1395 | if (proto) { |
| 1396 | po->prot_hook.type = proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | dev_add_pack(&po->prot_hook); |
| 1398 | sock_hold(sk); |
| 1399 | po->running = 1; |
| 1400 | } |
| 1401 | |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 1402 | write_lock_bh(&net->packet.sklist_lock); |
| 1403 | sk_add_node(sk, &net->packet.sklist); |
Eric Dumazet | 3680453 | 2008-11-19 14:25:35 -0800 | [diff] [blame] | 1404 | sock_prot_inuse_add(net, &packet_proto, 1); |
Eric Dumazet | 920de80 | 2008-11-24 00:09:29 -0800 | [diff] [blame] | 1405 | write_unlock_bh(&net->packet.sklist_lock); |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1406 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | out: |
| 1408 | return err; |
| 1409 | } |
| 1410 | |
| 1411 | /* |
| 1412 | * Pull a packet from our receive queue and hand it to the user. |
| 1413 | * If necessary we block. |
| 1414 | */ |
| 1415 | |
| 1416 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 1417 | struct msghdr *msg, size_t len, int flags) |
| 1418 | { |
| 1419 | struct sock *sk = sock->sk; |
| 1420 | struct sk_buff *skb; |
| 1421 | int copied, err; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1422 | struct sockaddr_ll *sll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | |
| 1424 | err = -EINVAL; |
| 1425 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) |
| 1426 | goto out; |
| 1427 | |
| 1428 | #if 0 |
| 1429 | /* What error should we return now? EUNATTACH? */ |
| 1430 | if (pkt_sk(sk)->ifindex < 0) |
| 1431 | return -ENODEV; |
| 1432 | #endif |
| 1433 | |
| 1434 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | * Call the generic datagram receiver. This handles all sorts |
| 1436 | * of horrible races and re-entrancy so we can forget about it |
| 1437 | * in the protocol layers. |
| 1438 | * |
| 1439 | * Now it will return ENETDOWN, if device have just gone down, |
| 1440 | * but then it will block. |
| 1441 | */ |
| 1442 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1443 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | |
| 1445 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1446 | * An error occurred so return it. Because skb_recv_datagram() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | * handles the blocking we don't see and worry about blocking |
| 1448 | * retries. |
| 1449 | */ |
| 1450 | |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 1451 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | goto out; |
| 1453 | |
| 1454 | /* |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1455 | * If the address length field is there to be filled in, we fill |
| 1456 | * it in now. |
| 1457 | */ |
| 1458 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 1459 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1460 | if (sock->type == SOCK_PACKET) |
| 1461 | msg->msg_namelen = sizeof(struct sockaddr_pkt); |
| 1462 | else |
| 1463 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); |
| 1464 | |
| 1465 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | * You lose any data beyond the buffer you gave. If it worries a |
| 1467 | * user program they can ask the device for its MTU anyway. |
| 1468 | */ |
| 1469 | |
| 1470 | copied = skb->len; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1471 | if (copied > len) { |
| 1472 | copied = len; |
| 1473 | msg->msg_flags |= MSG_TRUNC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | } |
| 1475 | |
| 1476 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
| 1477 | if (err) |
| 1478 | goto out_free; |
| 1479 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 1480 | sock_recv_ts_and_drops(msg, sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | |
| 1482 | if (msg->msg_name) |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 1483 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
| 1484 | msg->msg_namelen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1486 | if (pkt_sk(sk)->auxdata) { |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 1487 | struct tpacket_auxdata aux; |
| 1488 | |
| 1489 | aux.tp_status = TP_STATUS_USER; |
| 1490 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
| 1491 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; |
| 1492 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; |
| 1493 | aux.tp_snaplen = skb->len; |
| 1494 | aux.tp_mac = 0; |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1495 | aux.tp_net = skb_network_offset(skb); |
Eric Dumazet | 05423b2 | 2009-10-26 18:40:35 -0700 | [diff] [blame] | 1496 | aux.tp_vlan_tci = vlan_tx_tag_get(skb); |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 1497 | |
| 1498 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1499 | } |
| 1500 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | /* |
| 1502 | * Free or return the buffer as appropriate. Again this |
| 1503 | * hides all the races and re-entrancy issues from us. |
| 1504 | */ |
| 1505 | err = (flags&MSG_TRUNC) ? skb->len : copied; |
| 1506 | |
| 1507 | out_free: |
| 1508 | skb_free_datagram(sk, skb); |
| 1509 | out: |
| 1510 | return err; |
| 1511 | } |
| 1512 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1513 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
| 1514 | int *uaddr_len, int peer) |
| 1515 | { |
| 1516 | struct net_device *dev; |
| 1517 | struct sock *sk = sock->sk; |
| 1518 | |
| 1519 | if (peer) |
| 1520 | return -EOPNOTSUPP; |
| 1521 | |
| 1522 | uaddr->sa_family = AF_PACKET; |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 1523 | rcu_read_lock(); |
| 1524 | dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); |
| 1525 | if (dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | strlcpy(uaddr->sa_data, dev->name, 15); |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 1527 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | memset(uaddr->sa_data, 0, 14); |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 1529 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | *uaddr_len = sizeof(*uaddr); |
| 1531 | |
| 1532 | return 0; |
| 1533 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1534 | |
| 1535 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, |
| 1536 | int *uaddr_len, int peer) |
| 1537 | { |
| 1538 | struct net_device *dev; |
| 1539 | struct sock *sk = sock->sk; |
| 1540 | struct packet_sock *po = pkt_sk(sk); |
Cyrill Gorcunov | 13cfa97 | 2009-11-08 05:51:19 +0000 | [diff] [blame] | 1541 | DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | |
| 1543 | if (peer) |
| 1544 | return -EOPNOTSUPP; |
| 1545 | |
| 1546 | sll->sll_family = AF_PACKET; |
| 1547 | sll->sll_ifindex = po->ifindex; |
| 1548 | sll->sll_protocol = po->num; |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 1549 | rcu_read_lock(); |
| 1550 | dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | if (dev) { |
| 1552 | sll->sll_hatype = dev->type; |
| 1553 | sll->sll_halen = dev->addr_len; |
| 1554 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | } else { |
| 1556 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ |
| 1557 | sll->sll_halen = 0; |
| 1558 | } |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 1559 | rcu_read_unlock(); |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1560 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | |
| 1562 | return 0; |
| 1563 | } |
| 1564 | |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 1565 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
| 1566 | int what) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | { |
| 1568 | switch (i->type) { |
| 1569 | case PACKET_MR_MULTICAST: |
| 1570 | if (what > 0) |
Eric W. Biederman | d95ed92 | 2009-05-19 18:27:17 +0000 | [diff] [blame] | 1571 | return dev_mc_add(dev, i->addr, i->alen, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | else |
Eric W. Biederman | d95ed92 | 2009-05-19 18:27:17 +0000 | [diff] [blame] | 1573 | return dev_mc_delete(dev, i->addr, i->alen, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | break; |
| 1575 | case PACKET_MR_PROMISC: |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 1576 | return dev_set_promiscuity(dev, what); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | break; |
| 1578 | case PACKET_MR_ALLMULTI: |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 1579 | return dev_set_allmulti(dev, what); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | break; |
Eric W. Biederman | d95ed92 | 2009-05-19 18:27:17 +0000 | [diff] [blame] | 1581 | case PACKET_MR_UNICAST: |
| 1582 | if (what > 0) |
Jiri Pirko | ccffad2 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 1583 | return dev_unicast_add(dev, i->addr); |
Eric W. Biederman | d95ed92 | 2009-05-19 18:27:17 +0000 | [diff] [blame] | 1584 | else |
Jiri Pirko | ccffad2 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 1585 | return dev_unicast_delete(dev, i->addr); |
Eric W. Biederman | d95ed92 | 2009-05-19 18:27:17 +0000 | [diff] [blame] | 1586 | break; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1587 | default: |
| 1588 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1589 | } |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 1590 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | } |
| 1592 | |
| 1593 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) |
| 1594 | { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1595 | for ( ; i; i = i->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | if (i->ifindex == dev->ifindex) |
| 1597 | packet_dev_mc(dev, i, what); |
| 1598 | } |
| 1599 | } |
| 1600 | |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1601 | 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] | 1602 | { |
| 1603 | struct packet_sock *po = pkt_sk(sk); |
| 1604 | struct packet_mclist *ml, *i; |
| 1605 | struct net_device *dev; |
| 1606 | int err; |
| 1607 | |
| 1608 | rtnl_lock(); |
| 1609 | |
| 1610 | err = -ENODEV; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1611 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | if (!dev) |
| 1613 | goto done; |
| 1614 | |
| 1615 | err = -EINVAL; |
| 1616 | if (mreq->mr_alen > dev->addr_len) |
| 1617 | goto done; |
| 1618 | |
| 1619 | err = -ENOBUFS; |
Kris Katterjohn | 8b3a700 | 2006-01-11 15:56:43 -0800 | [diff] [blame] | 1620 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1621 | if (i == NULL) |
| 1622 | goto done; |
| 1623 | |
| 1624 | err = 0; |
| 1625 | for (ml = po->mclist; ml; ml = ml->next) { |
| 1626 | if (ml->ifindex == mreq->mr_ifindex && |
| 1627 | ml->type == mreq->mr_type && |
| 1628 | ml->alen == mreq->mr_alen && |
| 1629 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { |
| 1630 | ml->count++; |
| 1631 | /* Free the new element ... */ |
| 1632 | kfree(i); |
| 1633 | goto done; |
| 1634 | } |
| 1635 | } |
| 1636 | |
| 1637 | i->type = mreq->mr_type; |
| 1638 | i->ifindex = mreq->mr_ifindex; |
| 1639 | i->alen = mreq->mr_alen; |
| 1640 | memcpy(i->addr, mreq->mr_address, i->alen); |
| 1641 | i->count = 1; |
| 1642 | i->next = po->mclist; |
| 1643 | po->mclist = i; |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 1644 | err = packet_dev_mc(dev, i, 1); |
| 1645 | if (err) { |
| 1646 | po->mclist = i->next; |
| 1647 | kfree(i); |
| 1648 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | |
| 1650 | done: |
| 1651 | rtnl_unlock(); |
| 1652 | return err; |
| 1653 | } |
| 1654 | |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1655 | 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] | 1656 | { |
| 1657 | struct packet_mclist *ml, **mlp; |
| 1658 | |
| 1659 | rtnl_lock(); |
| 1660 | |
| 1661 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { |
| 1662 | if (ml->ifindex == mreq->mr_ifindex && |
| 1663 | ml->type == mreq->mr_type && |
| 1664 | ml->alen == mreq->mr_alen && |
| 1665 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { |
| 1666 | if (--ml->count == 0) { |
| 1667 | struct net_device *dev; |
| 1668 | *mlp = ml->next; |
Eric Dumazet | ad959e7 | 2009-10-16 06:38:46 +0000 | [diff] [blame] | 1669 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
| 1670 | if (dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | packet_dev_mc(dev, ml, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1672 | kfree(ml); |
| 1673 | } |
| 1674 | rtnl_unlock(); |
| 1675 | return 0; |
| 1676 | } |
| 1677 | } |
| 1678 | rtnl_unlock(); |
| 1679 | return -EADDRNOTAVAIL; |
| 1680 | } |
| 1681 | |
| 1682 | static void packet_flush_mclist(struct sock *sk) |
| 1683 | { |
| 1684 | struct packet_sock *po = pkt_sk(sk); |
| 1685 | struct packet_mclist *ml; |
| 1686 | |
| 1687 | if (!po->mclist) |
| 1688 | return; |
| 1689 | |
| 1690 | rtnl_lock(); |
| 1691 | while ((ml = po->mclist) != NULL) { |
| 1692 | struct net_device *dev; |
| 1693 | |
| 1694 | po->mclist = ml->next; |
Eric Dumazet | ad959e7 | 2009-10-16 06:38:46 +0000 | [diff] [blame] | 1695 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
| 1696 | if (dev != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1697 | packet_dev_mc(dev, ml, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | kfree(ml); |
| 1699 | } |
| 1700 | rtnl_unlock(); |
| 1701 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1702 | |
| 1703 | static int |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1704 | 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] | 1705 | { |
| 1706 | struct sock *sk = sock->sk; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1707 | struct packet_sock *po = pkt_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | int ret; |
| 1709 | |
| 1710 | if (level != SOL_PACKET) |
| 1711 | return -ENOPROTOOPT; |
| 1712 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1713 | switch (optname) { |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1714 | case PACKET_ADD_MEMBERSHIP: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | case PACKET_DROP_MEMBERSHIP: |
| 1716 | { |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1717 | struct packet_mreq_max mreq; |
| 1718 | int len = optlen; |
| 1719 | memset(&mreq, 0, sizeof(mreq)); |
| 1720 | if (len < sizeof(struct packet_mreq)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1721 | return -EINVAL; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1722 | if (len > sizeof(mreq)) |
| 1723 | len = sizeof(mreq); |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1724 | if (copy_from_user(&mreq, optval, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1725 | return -EFAULT; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1726 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
| 1727 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1728 | if (optname == PACKET_ADD_MEMBERSHIP) |
| 1729 | ret = packet_mc_add(sk, &mreq); |
| 1730 | else |
| 1731 | ret = packet_mc_drop(sk, &mreq); |
| 1732 | return ret; |
| 1733 | } |
David S. Miller | a2efcfa | 2007-05-29 13:12:50 -0700 | [diff] [blame] | 1734 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | #ifdef CONFIG_PACKET_MMAP |
| 1736 | case PACKET_RX_RING: |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1737 | case PACKET_TX_RING: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | { |
| 1739 | struct tpacket_req req; |
| 1740 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1741 | if (optlen < sizeof(req)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | return -EINVAL; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1743 | if (copy_from_user(&req, optval, sizeof(req))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | return -EFAULT; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1745 | return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1746 | } |
| 1747 | case PACKET_COPY_THRESH: |
| 1748 | { |
| 1749 | int val; |
| 1750 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1751 | if (optlen != sizeof(val)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1752 | return -EINVAL; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1753 | if (copy_from_user(&val, optval, sizeof(val))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | return -EFAULT; |
| 1755 | |
| 1756 | pkt_sk(sk)->copy_thresh = val; |
| 1757 | return 0; |
| 1758 | } |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1759 | case PACKET_VERSION: |
| 1760 | { |
| 1761 | int val; |
| 1762 | |
| 1763 | if (optlen != sizeof(val)) |
| 1764 | return -EINVAL; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1765 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1766 | return -EBUSY; |
| 1767 | if (copy_from_user(&val, optval, sizeof(val))) |
| 1768 | return -EFAULT; |
| 1769 | switch (val) { |
| 1770 | case TPACKET_V1: |
| 1771 | case TPACKET_V2: |
| 1772 | po->tp_version = val; |
| 1773 | return 0; |
| 1774 | default: |
| 1775 | return -EINVAL; |
| 1776 | } |
| 1777 | } |
Patrick McHardy | 8913336 | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 1778 | case PACKET_RESERVE: |
| 1779 | { |
| 1780 | unsigned int val; |
| 1781 | |
| 1782 | if (optlen != sizeof(val)) |
| 1783 | return -EINVAL; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1784 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
Patrick McHardy | 8913336 | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 1785 | return -EBUSY; |
| 1786 | if (copy_from_user(&val, optval, sizeof(val))) |
| 1787 | return -EFAULT; |
| 1788 | po->tp_reserve = val; |
| 1789 | return 0; |
| 1790 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1791 | case PACKET_LOSS: |
| 1792 | { |
| 1793 | unsigned int val; |
| 1794 | |
| 1795 | if (optlen != sizeof(val)) |
| 1796 | return -EINVAL; |
| 1797 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
| 1798 | return -EBUSY; |
| 1799 | if (copy_from_user(&val, optval, sizeof(val))) |
| 1800 | return -EFAULT; |
| 1801 | po->tp_loss = !!val; |
| 1802 | return 0; |
| 1803 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1804 | #endif |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1805 | case PACKET_AUXDATA: |
| 1806 | { |
| 1807 | int val; |
| 1808 | |
| 1809 | if (optlen < sizeof(val)) |
| 1810 | return -EINVAL; |
| 1811 | if (copy_from_user(&val, optval, sizeof(val))) |
| 1812 | return -EFAULT; |
| 1813 | |
| 1814 | po->auxdata = !!val; |
| 1815 | return 0; |
| 1816 | } |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 1817 | case PACKET_ORIGDEV: |
| 1818 | { |
| 1819 | int val; |
| 1820 | |
| 1821 | if (optlen < sizeof(val)) |
| 1822 | return -EINVAL; |
| 1823 | if (copy_from_user(&val, optval, sizeof(val))) |
| 1824 | return -EFAULT; |
| 1825 | |
| 1826 | po->origdev = !!val; |
| 1827 | return 0; |
| 1828 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1829 | default: |
| 1830 | return -ENOPROTOOPT; |
| 1831 | } |
| 1832 | } |
| 1833 | |
| 1834 | static int packet_getsockopt(struct socket *sock, int level, int optname, |
| 1835 | char __user *optval, int __user *optlen) |
| 1836 | { |
| 1837 | int len; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1838 | int val; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1839 | struct sock *sk = sock->sk; |
| 1840 | struct packet_sock *po = pkt_sk(sk); |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1841 | void *data; |
| 1842 | struct tpacket_stats st; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | |
| 1844 | if (level != SOL_PACKET) |
| 1845 | return -ENOPROTOOPT; |
| 1846 | |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 1847 | if (get_user(len, optlen)) |
| 1848 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1849 | |
| 1850 | if (len < 0) |
| 1851 | return -EINVAL; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1852 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1853 | switch (optname) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1854 | case PACKET_STATISTICS: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1855 | if (len > sizeof(struct tpacket_stats)) |
| 1856 | len = sizeof(struct tpacket_stats); |
| 1857 | spin_lock_bh(&sk->sk_receive_queue.lock); |
| 1858 | st = po->stats; |
| 1859 | memset(&po->stats, 0, sizeof(st)); |
| 1860 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 1861 | st.tp_packets += st.tp_drops; |
| 1862 | |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1863 | data = &st; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1864 | break; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1865 | case PACKET_AUXDATA: |
| 1866 | if (len > sizeof(int)) |
| 1867 | len = sizeof(int); |
| 1868 | val = po->auxdata; |
| 1869 | |
| 1870 | data = &val; |
| 1871 | break; |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 1872 | case PACKET_ORIGDEV: |
| 1873 | if (len > sizeof(int)) |
| 1874 | len = sizeof(int); |
| 1875 | val = po->origdev; |
| 1876 | |
| 1877 | data = &val; |
| 1878 | break; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1879 | #ifdef CONFIG_PACKET_MMAP |
| 1880 | case PACKET_VERSION: |
| 1881 | if (len > sizeof(int)) |
| 1882 | len = sizeof(int); |
| 1883 | val = po->tp_version; |
| 1884 | data = &val; |
| 1885 | break; |
| 1886 | case PACKET_HDRLEN: |
| 1887 | if (len > sizeof(int)) |
| 1888 | len = sizeof(int); |
| 1889 | if (copy_from_user(&val, optval, len)) |
| 1890 | return -EFAULT; |
| 1891 | switch (val) { |
| 1892 | case TPACKET_V1: |
| 1893 | val = sizeof(struct tpacket_hdr); |
| 1894 | break; |
| 1895 | case TPACKET_V2: |
| 1896 | val = sizeof(struct tpacket2_hdr); |
| 1897 | break; |
| 1898 | default: |
| 1899 | return -EINVAL; |
| 1900 | } |
| 1901 | data = &val; |
| 1902 | break; |
Patrick McHardy | 8913336 | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 1903 | case PACKET_RESERVE: |
| 1904 | if (len > sizeof(unsigned int)) |
| 1905 | len = sizeof(unsigned int); |
| 1906 | val = po->tp_reserve; |
| 1907 | data = &val; |
| 1908 | break; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1909 | case PACKET_LOSS: |
| 1910 | if (len > sizeof(unsigned int)) |
| 1911 | len = sizeof(unsigned int); |
| 1912 | val = po->tp_loss; |
| 1913 | data = &val; |
| 1914 | break; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1915 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | default: |
| 1917 | return -ENOPROTOOPT; |
| 1918 | } |
| 1919 | |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 1920 | if (put_user(len, optlen)) |
| 1921 | return -EFAULT; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1922 | if (copy_to_user(optval, data, len)) |
| 1923 | return -EFAULT; |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 1924 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1925 | } |
| 1926 | |
| 1927 | |
| 1928 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) |
| 1929 | { |
| 1930 | struct sock *sk; |
| 1931 | struct hlist_node *node; |
Jason Lunz | ad93065 | 2007-02-20 23:19:54 -0800 | [diff] [blame] | 1932 | struct net_device *dev = data; |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1933 | struct net *net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1934 | |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 1935 | read_lock(&net->packet.sklist_lock); |
| 1936 | sk_for_each(sk, node, &net->packet.sklist) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1937 | struct packet_sock *po = pkt_sk(sk); |
| 1938 | |
| 1939 | switch (msg) { |
| 1940 | case NETDEV_UNREGISTER: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | if (po->mclist) |
| 1942 | packet_dev_mclist(dev, po->mclist, -1); |
David S. Miller | a2efcfa | 2007-05-29 13:12:50 -0700 | [diff] [blame] | 1943 | /* fallthrough */ |
| 1944 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | case NETDEV_DOWN: |
| 1946 | if (dev->ifindex == po->ifindex) { |
| 1947 | spin_lock(&po->bind_lock); |
| 1948 | if (po->running) { |
| 1949 | __dev_remove_pack(&po->prot_hook); |
| 1950 | __sock_put(sk); |
| 1951 | po->running = 0; |
| 1952 | sk->sk_err = ENETDOWN; |
| 1953 | if (!sock_flag(sk, SOCK_DEAD)) |
| 1954 | sk->sk_error_report(sk); |
| 1955 | } |
| 1956 | if (msg == NETDEV_UNREGISTER) { |
| 1957 | po->ifindex = -1; |
| 1958 | po->prot_hook.dev = NULL; |
| 1959 | } |
| 1960 | spin_unlock(&po->bind_lock); |
| 1961 | } |
| 1962 | break; |
| 1963 | case NETDEV_UP: |
| 1964 | spin_lock(&po->bind_lock); |
| 1965 | if (dev->ifindex == po->ifindex && po->num && |
| 1966 | !po->running) { |
| 1967 | dev_add_pack(&po->prot_hook); |
| 1968 | sock_hold(sk); |
| 1969 | po->running = 1; |
| 1970 | } |
| 1971 | spin_unlock(&po->bind_lock); |
| 1972 | break; |
| 1973 | } |
| 1974 | } |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 1975 | read_unlock(&net->packet.sklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | return NOTIFY_DONE; |
| 1977 | } |
| 1978 | |
| 1979 | |
| 1980 | static int packet_ioctl(struct socket *sock, unsigned int cmd, |
| 1981 | unsigned long arg) |
| 1982 | { |
| 1983 | struct sock *sk = sock->sk; |
| 1984 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1985 | switch (cmd) { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1986 | case SIOCOUTQ: |
| 1987 | { |
| 1988 | int amount = sk_wmem_alloc_get(sk); |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 1989 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1990 | return put_user(amount, (int __user *)arg); |
| 1991 | } |
| 1992 | case SIOCINQ: |
| 1993 | { |
| 1994 | struct sk_buff *skb; |
| 1995 | int amount = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1996 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1997 | spin_lock_bh(&sk->sk_receive_queue.lock); |
| 1998 | skb = skb_peek(&sk->sk_receive_queue); |
| 1999 | if (skb) |
| 2000 | amount = skb->len; |
| 2001 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 2002 | return put_user(amount, (int __user *)arg); |
| 2003 | } |
| 2004 | case SIOCGSTAMP: |
| 2005 | return sock_get_timestamp(sk, (struct timeval __user *)arg); |
| 2006 | case SIOCGSTAMPNS: |
| 2007 | return sock_get_timestampns(sk, (struct timespec __user *)arg); |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2008 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2009 | #ifdef CONFIG_INET |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2010 | case SIOCADDRT: |
| 2011 | case SIOCDELRT: |
| 2012 | case SIOCDARP: |
| 2013 | case SIOCGARP: |
| 2014 | case SIOCSARP: |
| 2015 | case SIOCGIFADDR: |
| 2016 | case SIOCSIFADDR: |
| 2017 | case SIOCGIFBRDADDR: |
| 2018 | case SIOCSIFBRDADDR: |
| 2019 | case SIOCGIFNETMASK: |
| 2020 | case SIOCSIFNETMASK: |
| 2021 | case SIOCGIFDSTADDR: |
| 2022 | case SIOCSIFDSTADDR: |
| 2023 | case SIOCSIFFLAGS: |
| 2024 | if (!net_eq(sock_net(sk), &init_net)) |
| 2025 | return -ENOIOCTLCMD; |
| 2026 | return inet_dgram_ops.ioctl(sock, cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2027 | #endif |
| 2028 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2029 | default: |
| 2030 | return -ENOIOCTLCMD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2031 | } |
| 2032 | return 0; |
| 2033 | } |
| 2034 | |
| 2035 | #ifndef CONFIG_PACKET_MMAP |
| 2036 | #define packet_mmap sock_no_mmap |
| 2037 | #define packet_poll datagram_poll |
| 2038 | #else |
| 2039 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2040 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2041 | poll_table *wait) |
| 2042 | { |
| 2043 | struct sock *sk = sock->sk; |
| 2044 | struct packet_sock *po = pkt_sk(sk); |
| 2045 | unsigned int mask = datagram_poll(file, sock, wait); |
| 2046 | |
| 2047 | spin_lock_bh(&sk->sk_receive_queue.lock); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2048 | if (po->rx_ring.pg_vec) { |
| 2049 | if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | mask |= POLLIN | POLLRDNORM; |
| 2051 | } |
| 2052 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2053 | spin_lock_bh(&sk->sk_write_queue.lock); |
| 2054 | if (po->tx_ring.pg_vec) { |
| 2055 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) |
| 2056 | mask |= POLLOUT | POLLWRNORM; |
| 2057 | } |
| 2058 | spin_unlock_bh(&sk->sk_write_queue.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2059 | return mask; |
| 2060 | } |
| 2061 | |
| 2062 | |
| 2063 | /* Dirty? Well, I still did not learn better way to account |
| 2064 | * for user mmaps. |
| 2065 | */ |
| 2066 | |
| 2067 | static void packet_mm_open(struct vm_area_struct *vma) |
| 2068 | { |
| 2069 | struct file *file = vma->vm_file; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2070 | struct socket *sock = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2071 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2072 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2073 | if (sk) |
| 2074 | atomic_inc(&pkt_sk(sk)->mapped); |
| 2075 | } |
| 2076 | |
| 2077 | static void packet_mm_close(struct vm_area_struct *vma) |
| 2078 | { |
| 2079 | struct file *file = vma->vm_file; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2080 | struct socket *sock = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2081 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2082 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2083 | if (sk) |
| 2084 | atomic_dec(&pkt_sk(sk)->mapped); |
| 2085 | } |
| 2086 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 2087 | static const struct vm_operations_struct packet_mmap_ops = { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2088 | .open = packet_mm_open, |
| 2089 | .close = packet_mm_close, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2090 | }; |
| 2091 | |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 2092 | static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2093 | { |
| 2094 | int i; |
| 2095 | |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 2096 | for (i = 0; i < len; i++) { |
| 2097 | if (likely(pg_vec[i])) |
| 2098 | free_pages((unsigned long) pg_vec[i], order); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2099 | } |
| 2100 | kfree(pg_vec); |
| 2101 | } |
| 2102 | |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 2103 | static inline char *alloc_one_pg_vec_page(unsigned long order) |
| 2104 | { |
Eric Dumazet | 719bfea | 2009-04-15 03:39:52 -0700 | [diff] [blame] | 2105 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN; |
| 2106 | |
| 2107 | return (char *) __get_free_pages(gfp_flags, order); |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 2108 | } |
| 2109 | |
| 2110 | static char **alloc_pg_vec(struct tpacket_req *req, int order) |
| 2111 | { |
| 2112 | unsigned int block_nr = req->tp_block_nr; |
| 2113 | char **pg_vec; |
| 2114 | int i; |
| 2115 | |
| 2116 | pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL); |
| 2117 | if (unlikely(!pg_vec)) |
| 2118 | goto out; |
| 2119 | |
| 2120 | for (i = 0; i < block_nr; i++) { |
| 2121 | pg_vec[i] = alloc_one_pg_vec_page(order); |
| 2122 | if (unlikely(!pg_vec[i])) |
| 2123 | goto out_free_pgvec; |
| 2124 | } |
| 2125 | |
| 2126 | out: |
| 2127 | return pg_vec; |
| 2128 | |
| 2129 | out_free_pgvec: |
| 2130 | free_pg_vec(pg_vec, order, block_nr); |
| 2131 | pg_vec = NULL; |
| 2132 | goto out; |
| 2133 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2134 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2135 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
| 2136 | int closing, int tx_ring) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2137 | { |
| 2138 | char **pg_vec = NULL; |
| 2139 | struct packet_sock *po = pkt_sk(sk); |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 2140 | int was_running, order = 0; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2141 | struct packet_ring_buffer *rb; |
| 2142 | struct sk_buff_head *rb_queue; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 2143 | __be16 num; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2144 | int err; |
| 2145 | |
| 2146 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
| 2147 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; |
| 2148 | |
| 2149 | err = -EBUSY; |
| 2150 | if (!closing) { |
| 2151 | if (atomic_read(&po->mapped)) |
| 2152 | goto out; |
| 2153 | if (atomic_read(&rb->pending)) |
| 2154 | goto out; |
| 2155 | } |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2156 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2157 | if (req->tp_block_nr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2158 | /* Sanity tests and some calculations */ |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2159 | err = -EBUSY; |
| 2160 | if (unlikely(rb->pg_vec)) |
| 2161 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2162 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 2163 | switch (po->tp_version) { |
| 2164 | case TPACKET_V1: |
| 2165 | po->tp_hdrlen = TPACKET_HDRLEN; |
| 2166 | break; |
| 2167 | case TPACKET_V2: |
| 2168 | po->tp_hdrlen = TPACKET2_HDRLEN; |
| 2169 | break; |
| 2170 | } |
| 2171 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2172 | err = -EINVAL; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 2173 | if (unlikely((int)req->tp_block_size <= 0)) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2174 | goto out; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 2175 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2176 | goto out; |
Patrick McHardy | 8913336 | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 2177 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2178 | po->tp_reserve)) |
| 2179 | goto out; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 2180 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2181 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2182 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2183 | rb->frames_per_block = req->tp_block_size/req->tp_frame_size; |
| 2184 | if (unlikely(rb->frames_per_block <= 0)) |
| 2185 | goto out; |
| 2186 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != |
| 2187 | req->tp_frame_nr)) |
| 2188 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2189 | |
| 2190 | err = -ENOMEM; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 2191 | order = get_order(req->tp_block_size); |
| 2192 | pg_vec = alloc_pg_vec(req, order); |
| 2193 | if (unlikely(!pg_vec)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2194 | goto out; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2195 | } |
| 2196 | /* Done */ |
| 2197 | else { |
| 2198 | err = -EINVAL; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 2199 | if (unlikely(req->tp_frame_nr)) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2200 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2201 | } |
| 2202 | |
| 2203 | lock_sock(sk); |
| 2204 | |
| 2205 | /* Detach socket from network */ |
| 2206 | spin_lock(&po->bind_lock); |
| 2207 | was_running = po->running; |
| 2208 | num = po->num; |
| 2209 | if (was_running) { |
| 2210 | __dev_remove_pack(&po->prot_hook); |
| 2211 | po->num = 0; |
| 2212 | po->running = 0; |
| 2213 | __sock_put(sk); |
| 2214 | } |
| 2215 | spin_unlock(&po->bind_lock); |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2216 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2217 | synchronize_net(); |
| 2218 | |
| 2219 | err = -EBUSY; |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 2220 | mutex_lock(&po->pg_vec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | if (closing || atomic_read(&po->mapped) == 0) { |
| 2222 | err = 0; |
| 2223 | #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2224 | spin_lock_bh(&rb_queue->lock); |
| 2225 | pg_vec = XC(rb->pg_vec, pg_vec); |
| 2226 | rb->frame_max = (req->tp_frame_nr - 1); |
| 2227 | rb->head = 0; |
| 2228 | rb->frame_size = req->tp_frame_size; |
| 2229 | spin_unlock_bh(&rb_queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2230 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2231 | order = XC(rb->pg_vec_order, order); |
| 2232 | req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2233 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2234 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; |
| 2235 | po->prot_hook.func = (po->rx_ring.pg_vec) ? |
| 2236 | tpacket_rcv : packet_rcv; |
| 2237 | skb_queue_purge(rb_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2238 | #undef XC |
| 2239 | if (atomic_read(&po->mapped)) |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2240 | pr_err("packet_mmap: vma is busy: %d\n", |
| 2241 | atomic_read(&po->mapped)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2242 | } |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 2243 | mutex_unlock(&po->pg_vec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2244 | |
| 2245 | spin_lock(&po->bind_lock); |
| 2246 | if (was_running && !po->running) { |
| 2247 | sock_hold(sk); |
| 2248 | po->running = 1; |
| 2249 | po->num = num; |
| 2250 | dev_add_pack(&po->prot_hook); |
| 2251 | } |
| 2252 | spin_unlock(&po->bind_lock); |
| 2253 | |
| 2254 | release_sock(sk); |
| 2255 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2256 | if (pg_vec) |
| 2257 | free_pg_vec(pg_vec, order, req->tp_block_nr); |
| 2258 | out: |
| 2259 | return err; |
| 2260 | } |
| 2261 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2262 | static int packet_mmap(struct file *file, struct socket *sock, |
| 2263 | struct vm_area_struct *vma) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2264 | { |
| 2265 | struct sock *sk = sock->sk; |
| 2266 | struct packet_sock *po = pkt_sk(sk); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2267 | unsigned long size, expected_size; |
| 2268 | struct packet_ring_buffer *rb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2269 | unsigned long start; |
| 2270 | int err = -EINVAL; |
| 2271 | int i; |
| 2272 | |
| 2273 | if (vma->vm_pgoff) |
| 2274 | return -EINVAL; |
| 2275 | |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 2276 | mutex_lock(&po->pg_vec_lock); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2277 | |
| 2278 | expected_size = 0; |
| 2279 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
| 2280 | if (rb->pg_vec) { |
| 2281 | expected_size += rb->pg_vec_len |
| 2282 | * rb->pg_vec_pages |
| 2283 | * PAGE_SIZE; |
| 2284 | } |
| 2285 | } |
| 2286 | |
| 2287 | if (expected_size == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2288 | goto out; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2289 | |
| 2290 | size = vma->vm_end - vma->vm_start; |
| 2291 | if (size != expected_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2292 | goto out; |
| 2293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2294 | start = vma->vm_start; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2295 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
| 2296 | if (rb->pg_vec == NULL) |
| 2297 | continue; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 2298 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2299 | for (i = 0; i < rb->pg_vec_len; i++) { |
| 2300 | struct page *page = virt_to_page(rb->pg_vec[i]); |
| 2301 | int pg_num; |
| 2302 | |
| 2303 | for (pg_num = 0; pg_num < rb->pg_vec_pages; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2304 | pg_num++, page++) { |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2305 | err = vm_insert_page(vma, start, page); |
| 2306 | if (unlikely(err)) |
| 2307 | goto out; |
| 2308 | start += PAGE_SIZE; |
| 2309 | } |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 2310 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2311 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2312 | |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 2313 | atomic_inc(&po->mapped); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2314 | vma->vm_ops = &packet_mmap_ops; |
| 2315 | err = 0; |
| 2316 | |
| 2317 | out: |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 2318 | mutex_unlock(&po->pg_vec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2319 | return err; |
| 2320 | } |
| 2321 | #endif |
| 2322 | |
| 2323 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 2324 | static const struct proto_ops packet_ops_spkt = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2325 | .family = PF_PACKET, |
| 2326 | .owner = THIS_MODULE, |
| 2327 | .release = packet_release, |
| 2328 | .bind = packet_bind_spkt, |
| 2329 | .connect = sock_no_connect, |
| 2330 | .socketpair = sock_no_socketpair, |
| 2331 | .accept = sock_no_accept, |
| 2332 | .getname = packet_getname_spkt, |
| 2333 | .poll = datagram_poll, |
| 2334 | .ioctl = packet_ioctl, |
| 2335 | .listen = sock_no_listen, |
| 2336 | .shutdown = sock_no_shutdown, |
| 2337 | .setsockopt = sock_no_setsockopt, |
| 2338 | .getsockopt = sock_no_getsockopt, |
| 2339 | .sendmsg = packet_sendmsg_spkt, |
| 2340 | .recvmsg = packet_recvmsg, |
| 2341 | .mmap = sock_no_mmap, |
| 2342 | .sendpage = sock_no_sendpage, |
| 2343 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2344 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 2345 | static const struct proto_ops packet_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2346 | .family = PF_PACKET, |
| 2347 | .owner = THIS_MODULE, |
| 2348 | .release = packet_release, |
| 2349 | .bind = packet_bind, |
| 2350 | .connect = sock_no_connect, |
| 2351 | .socketpair = sock_no_socketpair, |
| 2352 | .accept = sock_no_accept, |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2353 | .getname = packet_getname, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2354 | .poll = packet_poll, |
| 2355 | .ioctl = packet_ioctl, |
| 2356 | .listen = sock_no_listen, |
| 2357 | .shutdown = sock_no_shutdown, |
| 2358 | .setsockopt = packet_setsockopt, |
| 2359 | .getsockopt = packet_getsockopt, |
| 2360 | .sendmsg = packet_sendmsg, |
| 2361 | .recvmsg = packet_recvmsg, |
| 2362 | .mmap = packet_mmap, |
| 2363 | .sendpage = sock_no_sendpage, |
| 2364 | }; |
| 2365 | |
Stephen Hemminger | ec1b4cf | 2009-10-05 05:58:39 +0000 | [diff] [blame] | 2366 | static const struct net_proto_family packet_family_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2367 | .family = PF_PACKET, |
| 2368 | .create = packet_create, |
| 2369 | .owner = THIS_MODULE, |
| 2370 | }; |
| 2371 | |
| 2372 | static struct notifier_block packet_netdev_notifier = { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2373 | .notifier_call = packet_notifier, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2374 | }; |
| 2375 | |
| 2376 | #ifdef CONFIG_PROC_FS |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 2377 | static inline struct sock *packet_seq_idx(struct net *net, loff_t off) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2378 | { |
| 2379 | struct sock *s; |
| 2380 | struct hlist_node *node; |
| 2381 | |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 2382 | sk_for_each(s, node, &net->packet.sklist) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2383 | if (!off--) |
| 2384 | return s; |
| 2385 | } |
| 2386 | return NULL; |
| 2387 | } |
| 2388 | |
| 2389 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) |
Eric Dumazet | 40ccbf5 | 2008-01-07 22:39:57 -0800 | [diff] [blame] | 2390 | __acquires(seq_file_net(seq)->packet.sklist_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2391 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2392 | struct net *net = seq_file_net(seq); |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 2393 | read_lock(&net->packet.sklist_lock); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 2394 | return *pos ? packet_seq_idx(net, *pos - 1) : SEQ_START_TOKEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2395 | } |
| 2396 | |
| 2397 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2398 | { |
Herbert Xu | 1bf4095 | 2007-12-16 14:04:02 -0800 | [diff] [blame] | 2399 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2400 | ++*pos; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2401 | return (v == SEQ_START_TOKEN) |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 2402 | ? sk_head(&net->packet.sklist) |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2403 | : sk_next((struct sock *)v) ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2404 | } |
| 2405 | |
| 2406 | static void packet_seq_stop(struct seq_file *seq, void *v) |
Eric Dumazet | 40ccbf5 | 2008-01-07 22:39:57 -0800 | [diff] [blame] | 2407 | __releases(seq_file_net(seq)->packet.sklist_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2408 | { |
Herbert Xu | 1bf4095 | 2007-12-16 14:04:02 -0800 | [diff] [blame] | 2409 | struct net *net = seq_file_net(seq); |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 2410 | read_unlock(&net->packet.sklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2411 | } |
| 2412 | |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2413 | static int packet_seq_show(struct seq_file *seq, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2414 | { |
| 2415 | if (v == SEQ_START_TOKEN) |
| 2416 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); |
| 2417 | else { |
| 2418 | struct sock *s = v; |
| 2419 | const struct packet_sock *po = pkt_sk(s); |
| 2420 | |
| 2421 | seq_printf(seq, |
| 2422 | "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", |
| 2423 | s, |
| 2424 | atomic_read(&s->sk_refcnt), |
| 2425 | s->sk_type, |
| 2426 | ntohs(po->num), |
| 2427 | po->ifindex, |
| 2428 | po->running, |
| 2429 | atomic_read(&s->sk_rmem_alloc), |
| 2430 | sock_i_uid(s), |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2431 | sock_i_ino(s)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2432 | } |
| 2433 | |
| 2434 | return 0; |
| 2435 | } |
| 2436 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 2437 | static const struct seq_operations packet_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2438 | .start = packet_seq_start, |
| 2439 | .next = packet_seq_next, |
| 2440 | .stop = packet_seq_stop, |
| 2441 | .show = packet_seq_show, |
| 2442 | }; |
| 2443 | |
| 2444 | static int packet_seq_open(struct inode *inode, struct file *file) |
| 2445 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2446 | return seq_open_net(inode, file, &packet_seq_ops, |
| 2447 | sizeof(struct seq_net_private)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2448 | } |
| 2449 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 2450 | static const struct file_operations packet_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2451 | .owner = THIS_MODULE, |
| 2452 | .open = packet_seq_open, |
| 2453 | .read = seq_read, |
| 2454 | .llseek = seq_lseek, |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2455 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2456 | }; |
| 2457 | |
| 2458 | #endif |
| 2459 | |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 2460 | static int packet_net_init(struct net *net) |
| 2461 | { |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 2462 | rwlock_init(&net->packet.sklist_lock); |
| 2463 | INIT_HLIST_HEAD(&net->packet.sklist); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 2464 | |
| 2465 | if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops)) |
| 2466 | return -ENOMEM; |
| 2467 | |
| 2468 | return 0; |
| 2469 | } |
| 2470 | |
| 2471 | static void packet_net_exit(struct net *net) |
| 2472 | { |
| 2473 | proc_net_remove(net, "packet"); |
| 2474 | } |
| 2475 | |
| 2476 | static struct pernet_operations packet_net_ops = { |
| 2477 | .init = packet_net_init, |
| 2478 | .exit = packet_net_exit, |
| 2479 | }; |
| 2480 | |
| 2481 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2482 | static void __exit packet_exit(void) |
| 2483 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2484 | unregister_netdevice_notifier(&packet_netdev_notifier); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 2485 | unregister_pernet_subsys(&packet_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2486 | sock_unregister(PF_PACKET); |
| 2487 | proto_unregister(&packet_proto); |
| 2488 | } |
| 2489 | |
| 2490 | static int __init packet_init(void) |
| 2491 | { |
| 2492 | int rc = proto_register(&packet_proto, 0); |
| 2493 | |
| 2494 | if (rc != 0) |
| 2495 | goto out; |
| 2496 | |
| 2497 | sock_register(&packet_family_ops); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 2498 | register_pernet_subsys(&packet_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2499 | register_netdevice_notifier(&packet_netdev_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2500 | out: |
| 2501 | return rc; |
| 2502 | } |
| 2503 | |
| 2504 | module_init(packet_init); |
| 2505 | module_exit(packet_exit); |
| 2506 | MODULE_LICENSE("GPL"); |
| 2507 | MODULE_ALIAS_NETPROTO(PF_PACKET); |