Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
11 | * | |
1ce4f28b | 12 | * Fixes: |
1da177e4 LT |
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. | |
1ce4f28b | 35 | * Ulises Alonso : Frame number limit removal and |
1da177e4 | 36 | * packet_set_ring memory leak. |
0fb375fb EB |
37 | * Eric Biederman : Allow for > 8 byte hardware addresses. |
38 | * The convention is that longer addresses | |
39 | * will simply extend the hardware address | |
1ce4f28b | 40 | * byte arrays at the end of sockaddr_ll |
0fb375fb | 41 | * and packet_mreq. |
69e3c75f | 42 | * Johann Baudy : Added TX RING. |
1da177e4 LT |
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 | */ | |
1ce4f28b | 50 | |
1da177e4 | 51 | #include <linux/types.h> |
1da177e4 | 52 | #include <linux/mm.h> |
4fc268d2 | 53 | #include <linux/capability.h> |
1da177e4 LT |
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> | |
ffbc6111 | 61 | #include <linux/kernel.h> |
1da177e4 | 62 | #include <linux/kmod.h> |
5a0e3ad6 | 63 | #include <linux/slab.h> |
0e3125c7 | 64 | #include <linux/vmalloc.h> |
457c4cbc | 65 | #include <net/net_namespace.h> |
1da177e4 LT |
66 | #include <net/ip.h> |
67 | #include <net/protocol.h> | |
68 | #include <linux/skbuff.h> | |
69 | #include <net/sock.h> | |
70 | #include <linux/errno.h> | |
71 | #include <linux/timer.h> | |
72 | #include <asm/system.h> | |
73 | #include <asm/uaccess.h> | |
74 | #include <asm/ioctls.h> | |
75 | #include <asm/page.h> | |
a1f8e7f7 | 76 | #include <asm/cacheflush.h> |
1da177e4 LT |
77 | #include <asm/io.h> |
78 | #include <linux/proc_fs.h> | |
79 | #include <linux/seq_file.h> | |
80 | #include <linux/poll.h> | |
81 | #include <linux/module.h> | |
82 | #include <linux/init.h> | |
905db440 | 83 | #include <linux/mutex.h> |
05423b24 | 84 | #include <linux/if_vlan.h> |
bfd5f4a3 | 85 | #include <linux/virtio_net.h> |
ed85b565 | 86 | #include <linux/errqueue.h> |
614f60fa | 87 | #include <linux/net_tstamp.h> |
1da177e4 LT |
88 | |
89 | #ifdef CONFIG_INET | |
90 | #include <net/inet_common.h> | |
91 | #endif | |
92 | ||
1da177e4 LT |
93 | /* |
94 | Assumptions: | |
95 | - if device has no dev->hard_header routine, it adds and removes ll header | |
96 | inside itself. In this case ll header is invisible outside of device, | |
97 | but higher levels still should reserve dev->hard_header_len. | |
98 | Some devices are enough clever to reallocate skb, when header | |
99 | will not fit to reserved space (tunnel), another ones are silly | |
100 | (PPP). | |
101 | - packet socket receives packets with pulled ll header, | |
102 | so that SOCK_RAW should push it back. | |
103 | ||
104 | On receive: | |
105 | ----------- | |
106 | ||
107 | Incoming, dev->hard_header!=NULL | |
b0e380b1 ACM |
108 | mac_header -> ll header |
109 | data -> data | |
1da177e4 LT |
110 | |
111 | Outgoing, dev->hard_header!=NULL | |
b0e380b1 ACM |
112 | mac_header -> ll header |
113 | data -> ll header | |
1da177e4 LT |
114 | |
115 | Incoming, dev->hard_header==NULL | |
b0e380b1 ACM |
116 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
117 | header. PPP makes it, that is wrong, because introduce | |
db0c58f9 | 118 | assymetry between rx and tx paths. |
b0e380b1 | 119 | data -> data |
1da177e4 LT |
120 | |
121 | Outgoing, dev->hard_header==NULL | |
b0e380b1 ACM |
122 | mac_header -> data. ll header is still not built! |
123 | data -> data | |
1da177e4 LT |
124 | |
125 | Resume | |
126 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. | |
127 | ||
128 | ||
129 | On transmit: | |
130 | ------------ | |
131 | ||
132 | dev->hard_header != NULL | |
b0e380b1 ACM |
133 | mac_header -> ll header |
134 | data -> ll header | |
1da177e4 LT |
135 | |
136 | dev->hard_header == NULL (ll header is added by device, we cannot control it) | |
b0e380b1 ACM |
137 | mac_header -> data |
138 | data -> data | |
1da177e4 LT |
139 | |
140 | We should set nh.raw on output to correct posistion, | |
141 | packet classifier depends on it. | |
142 | */ | |
143 | ||
1da177e4 LT |
144 | /* Private packet socket structures. */ |
145 | ||
40d4e3df | 146 | struct packet_mclist { |
1da177e4 LT |
147 | struct packet_mclist *next; |
148 | int ifindex; | |
149 | int count; | |
150 | unsigned short type; | |
151 | unsigned short alen; | |
0fb375fb EB |
152 | unsigned char addr[MAX_ADDR_LEN]; |
153 | }; | |
154 | /* identical to struct packet_mreq except it has | |
155 | * a longer address field. | |
156 | */ | |
40d4e3df | 157 | struct packet_mreq_max { |
0fb375fb EB |
158 | int mr_ifindex; |
159 | unsigned short mr_type; | |
160 | unsigned short mr_alen; | |
161 | unsigned char mr_address[MAX_ADDR_LEN]; | |
1da177e4 | 162 | }; |
a2efcfa0 | 163 | |
69e3c75f JB |
164 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
165 | int closing, int tx_ring); | |
166 | ||
0e3125c7 NH |
167 | struct pgv { |
168 | char *buffer; | |
0e3125c7 NH |
169 | }; |
170 | ||
69e3c75f | 171 | struct packet_ring_buffer { |
0e3125c7 | 172 | struct pgv *pg_vec; |
69e3c75f JB |
173 | unsigned int head; |
174 | unsigned int frames_per_block; | |
175 | unsigned int frame_size; | |
176 | unsigned int frame_max; | |
177 | ||
178 | unsigned int pg_vec_order; | |
179 | unsigned int pg_vec_pages; | |
180 | unsigned int pg_vec_len; | |
181 | ||
182 | atomic_t pending; | |
183 | }; | |
184 | ||
185 | struct packet_sock; | |
186 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg); | |
1da177e4 LT |
187 | |
188 | static void packet_flush_mclist(struct sock *sk); | |
189 | ||
dc99f600 | 190 | struct packet_fanout; |
1da177e4 LT |
191 | struct packet_sock { |
192 | /* struct sock has to be the first member of packet_sock */ | |
193 | struct sock sk; | |
dc99f600 | 194 | struct packet_fanout *fanout; |
1da177e4 | 195 | struct tpacket_stats stats; |
69e3c75f JB |
196 | struct packet_ring_buffer rx_ring; |
197 | struct packet_ring_buffer tx_ring; | |
1da177e4 | 198 | int copy_thresh; |
1da177e4 | 199 | spinlock_t bind_lock; |
905db440 | 200 | struct mutex pg_vec_lock; |
8dc41944 | 201 | unsigned int running:1, /* prot_hook is attached*/ |
80feaacb | 202 | auxdata:1, |
bfd5f4a3 SS |
203 | origdev:1, |
204 | has_vnet_hdr:1; | |
1da177e4 | 205 | int ifindex; /* bound device */ |
0e11c91e | 206 | __be16 num; |
1da177e4 | 207 | struct packet_mclist *mclist; |
1da177e4 | 208 | atomic_t mapped; |
bbd6ef87 PM |
209 | enum tpacket_versions tp_version; |
210 | unsigned int tp_hdrlen; | |
8913336a | 211 | unsigned int tp_reserve; |
69e3c75f | 212 | unsigned int tp_loss:1; |
614f60fa | 213 | unsigned int tp_tstamp; |
94b05952 | 214 | struct packet_type prot_hook ____cacheline_aligned_in_smp; |
1da177e4 LT |
215 | }; |
216 | ||
dc99f600 DM |
217 | #define PACKET_FANOUT_MAX 256 |
218 | ||
219 | struct packet_fanout { | |
220 | #ifdef CONFIG_NET_NS | |
221 | struct net *net; | |
222 | #endif | |
223 | unsigned int num_members; | |
224 | u16 id; | |
225 | u8 type; | |
7736d33f | 226 | u8 defrag; |
dc99f600 DM |
227 | atomic_t rr_cur; |
228 | struct list_head list; | |
229 | struct sock *arr[PACKET_FANOUT_MAX]; | |
230 | spinlock_t lock; | |
231 | atomic_t sk_ref; | |
232 | struct packet_type prot_hook ____cacheline_aligned_in_smp; | |
233 | }; | |
234 | ||
ffbc6111 HX |
235 | struct packet_skb_cb { |
236 | unsigned int origlen; | |
237 | union { | |
238 | struct sockaddr_pkt pkt; | |
239 | struct sockaddr_ll ll; | |
240 | } sa; | |
241 | }; | |
242 | ||
243 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) | |
8dc41944 | 244 | |
ce06b03e DM |
245 | static inline struct packet_sock *pkt_sk(struct sock *sk) |
246 | { | |
247 | return (struct packet_sock *)sk; | |
248 | } | |
249 | ||
dc99f600 DM |
250 | static void __fanout_unlink(struct sock *sk, struct packet_sock *po); |
251 | static void __fanout_link(struct sock *sk, struct packet_sock *po); | |
252 | ||
ce06b03e DM |
253 | /* register_prot_hook must be invoked with the po->bind_lock held, |
254 | * or from a context in which asynchronous accesses to the packet | |
255 | * socket is not possible (packet_create()). | |
256 | */ | |
257 | static void register_prot_hook(struct sock *sk) | |
258 | { | |
259 | struct packet_sock *po = pkt_sk(sk); | |
260 | if (!po->running) { | |
dc99f600 DM |
261 | if (po->fanout) |
262 | __fanout_link(sk, po); | |
263 | else | |
264 | dev_add_pack(&po->prot_hook); | |
ce06b03e DM |
265 | sock_hold(sk); |
266 | po->running = 1; | |
267 | } | |
268 | } | |
269 | ||
270 | /* {,__}unregister_prot_hook() must be invoked with the po->bind_lock | |
271 | * held. If the sync parameter is true, we will temporarily drop | |
272 | * the po->bind_lock and do a synchronize_net to make sure no | |
273 | * asynchronous packet processing paths still refer to the elements | |
274 | * of po->prot_hook. If the sync parameter is false, it is the | |
275 | * callers responsibility to take care of this. | |
276 | */ | |
277 | static void __unregister_prot_hook(struct sock *sk, bool sync) | |
278 | { | |
279 | struct packet_sock *po = pkt_sk(sk); | |
280 | ||
281 | po->running = 0; | |
dc99f600 DM |
282 | if (po->fanout) |
283 | __fanout_unlink(sk, po); | |
284 | else | |
285 | __dev_remove_pack(&po->prot_hook); | |
ce06b03e DM |
286 | __sock_put(sk); |
287 | ||
288 | if (sync) { | |
289 | spin_unlock(&po->bind_lock); | |
290 | synchronize_net(); | |
291 | spin_lock(&po->bind_lock); | |
292 | } | |
293 | } | |
294 | ||
295 | static void unregister_prot_hook(struct sock *sk, bool sync) | |
296 | { | |
297 | struct packet_sock *po = pkt_sk(sk); | |
298 | ||
299 | if (po->running) | |
300 | __unregister_prot_hook(sk, sync); | |
301 | } | |
302 | ||
f6dafa95 | 303 | static inline __pure struct page *pgv_to_page(void *addr) |
0af55bb5 CG |
304 | { |
305 | if (is_vmalloc_addr(addr)) | |
306 | return vmalloc_to_page(addr); | |
307 | return virt_to_page(addr); | |
308 | } | |
309 | ||
69e3c75f | 310 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
1da177e4 | 311 | { |
bbd6ef87 PM |
312 | union { |
313 | struct tpacket_hdr *h1; | |
314 | struct tpacket2_hdr *h2; | |
315 | void *raw; | |
316 | } h; | |
1da177e4 | 317 | |
69e3c75f | 318 | h.raw = frame; |
bbd6ef87 PM |
319 | switch (po->tp_version) { |
320 | case TPACKET_V1: | |
69e3c75f | 321 | h.h1->tp_status = status; |
0af55bb5 | 322 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
bbd6ef87 PM |
323 | break; |
324 | case TPACKET_V2: | |
69e3c75f | 325 | h.h2->tp_status = status; |
0af55bb5 | 326 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
bbd6ef87 | 327 | break; |
69e3c75f | 328 | default: |
40d4e3df | 329 | pr_err("TPACKET version not supported\n"); |
69e3c75f | 330 | BUG(); |
bbd6ef87 | 331 | } |
69e3c75f JB |
332 | |
333 | smp_wmb(); | |
bbd6ef87 PM |
334 | } |
335 | ||
69e3c75f | 336 | static int __packet_get_status(struct packet_sock *po, void *frame) |
bbd6ef87 PM |
337 | { |
338 | union { | |
339 | struct tpacket_hdr *h1; | |
340 | struct tpacket2_hdr *h2; | |
341 | void *raw; | |
342 | } h; | |
343 | ||
69e3c75f JB |
344 | smp_rmb(); |
345 | ||
bbd6ef87 PM |
346 | h.raw = frame; |
347 | switch (po->tp_version) { | |
348 | case TPACKET_V1: | |
0af55bb5 | 349 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
69e3c75f | 350 | return h.h1->tp_status; |
bbd6ef87 | 351 | case TPACKET_V2: |
0af55bb5 | 352 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
69e3c75f JB |
353 | return h.h2->tp_status; |
354 | default: | |
40d4e3df | 355 | pr_err("TPACKET version not supported\n"); |
69e3c75f JB |
356 | BUG(); |
357 | return 0; | |
bbd6ef87 | 358 | } |
1da177e4 | 359 | } |
69e3c75f JB |
360 | |
361 | static void *packet_lookup_frame(struct packet_sock *po, | |
362 | struct packet_ring_buffer *rb, | |
363 | unsigned int position, | |
364 | int status) | |
365 | { | |
366 | unsigned int pg_vec_pos, frame_offset; | |
367 | union { | |
368 | struct tpacket_hdr *h1; | |
369 | struct tpacket2_hdr *h2; | |
370 | void *raw; | |
371 | } h; | |
372 | ||
373 | pg_vec_pos = position / rb->frames_per_block; | |
374 | frame_offset = position % rb->frames_per_block; | |
375 | ||
0e3125c7 NH |
376 | h.raw = rb->pg_vec[pg_vec_pos].buffer + |
377 | (frame_offset * rb->frame_size); | |
69e3c75f JB |
378 | |
379 | if (status != __packet_get_status(po, h.raw)) | |
380 | return NULL; | |
381 | ||
382 | return h.raw; | |
383 | } | |
384 | ||
385 | static inline void *packet_current_frame(struct packet_sock *po, | |
386 | struct packet_ring_buffer *rb, | |
387 | int status) | |
388 | { | |
389 | return packet_lookup_frame(po, rb, rb->head, status); | |
390 | } | |
391 | ||
392 | static inline void *packet_previous_frame(struct packet_sock *po, | |
393 | struct packet_ring_buffer *rb, | |
394 | int status) | |
395 | { | |
396 | unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; | |
397 | return packet_lookup_frame(po, rb, previous, status); | |
398 | } | |
399 | ||
400 | static inline void packet_increment_head(struct packet_ring_buffer *buff) | |
401 | { | |
402 | buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; | |
403 | } | |
404 | ||
1da177e4 LT |
405 | static void packet_sock_destruct(struct sock *sk) |
406 | { | |
ed85b565 RC |
407 | skb_queue_purge(&sk->sk_error_queue); |
408 | ||
547b792c IJ |
409 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
410 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); | |
1da177e4 LT |
411 | |
412 | if (!sock_flag(sk, SOCK_DEAD)) { | |
40d4e3df | 413 | pr_err("Attempt to release alive packet socket: %p\n", sk); |
1da177e4 LT |
414 | return; |
415 | } | |
416 | ||
17ab56a2 | 417 | sk_refcnt_debug_dec(sk); |
1da177e4 LT |
418 | } |
419 | ||
dc99f600 DM |
420 | static int fanout_rr_next(struct packet_fanout *f, unsigned int num) |
421 | { | |
422 | int x = atomic_read(&f->rr_cur) + 1; | |
423 | ||
424 | if (x >= num) | |
425 | x = 0; | |
426 | ||
427 | return x; | |
428 | } | |
429 | ||
430 | static struct sock *fanout_demux_hash(struct packet_fanout *f, struct sk_buff *skb, unsigned int num) | |
431 | { | |
432 | u32 idx, hash = skb->rxhash; | |
433 | ||
434 | idx = ((u64)hash * num) >> 32; | |
435 | ||
436 | return f->arr[idx]; | |
437 | } | |
438 | ||
439 | static struct sock *fanout_demux_lb(struct packet_fanout *f, struct sk_buff *skb, unsigned int num) | |
440 | { | |
441 | int cur, old; | |
442 | ||
443 | cur = atomic_read(&f->rr_cur); | |
444 | while ((old = atomic_cmpxchg(&f->rr_cur, cur, | |
445 | fanout_rr_next(f, num))) != cur) | |
446 | cur = old; | |
447 | return f->arr[cur]; | |
448 | } | |
449 | ||
95ec3eb4 DM |
450 | static struct sock *fanout_demux_cpu(struct packet_fanout *f, struct sk_buff *skb, unsigned int num) |
451 | { | |
452 | unsigned int cpu = smp_processor_id(); | |
453 | ||
454 | return f->arr[cpu % num]; | |
455 | } | |
456 | ||
7736d33f DM |
457 | static struct sk_buff *fanout_check_defrag(struct sk_buff *skb) |
458 | { | |
31817df0 | 459 | #ifdef CONFIG_INET |
7736d33f DM |
460 | const struct iphdr *iph; |
461 | u32 len; | |
462 | ||
463 | if (skb->protocol != htons(ETH_P_IP)) | |
464 | return skb; | |
465 | ||
466 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
467 | return skb; | |
468 | ||
469 | iph = ip_hdr(skb); | |
470 | if (iph->ihl < 5 || iph->version != 4) | |
471 | return skb; | |
472 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
473 | return skb; | |
474 | iph = ip_hdr(skb); | |
475 | len = ntohs(iph->tot_len); | |
476 | if (skb->len < len || len < (iph->ihl * 4)) | |
477 | return skb; | |
478 | ||
479 | if (ip_is_fragment(ip_hdr(skb))) { | |
aec27311 | 480 | skb = skb_share_check(skb, GFP_ATOMIC); |
7736d33f DM |
481 | if (skb) { |
482 | if (pskb_trim_rcsum(skb, len)) | |
483 | return skb; | |
484 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); | |
485 | if (ip_defrag(skb, IP_DEFRAG_AF_PACKET)) | |
486 | return NULL; | |
487 | skb->rxhash = 0; | |
488 | } | |
489 | } | |
31817df0 | 490 | #endif |
7736d33f DM |
491 | return skb; |
492 | } | |
493 | ||
95ec3eb4 DM |
494 | static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev, |
495 | struct packet_type *pt, struct net_device *orig_dev) | |
dc99f600 DM |
496 | { |
497 | struct packet_fanout *f = pt->af_packet_priv; | |
498 | unsigned int num = f->num_members; | |
499 | struct packet_sock *po; | |
500 | struct sock *sk; | |
501 | ||
502 | if (!net_eq(dev_net(dev), read_pnet(&f->net)) || | |
503 | !num) { | |
504 | kfree_skb(skb); | |
505 | return 0; | |
506 | } | |
507 | ||
95ec3eb4 DM |
508 | switch (f->type) { |
509 | case PACKET_FANOUT_HASH: | |
510 | default: | |
511 | if (f->defrag) { | |
512 | skb = fanout_check_defrag(skb); | |
513 | if (!skb) | |
514 | return 0; | |
515 | } | |
516 | skb_get_rxhash(skb); | |
517 | sk = fanout_demux_hash(f, skb, num); | |
518 | break; | |
519 | case PACKET_FANOUT_LB: | |
520 | sk = fanout_demux_lb(f, skb, num); | |
521 | break; | |
522 | case PACKET_FANOUT_CPU: | |
523 | sk = fanout_demux_cpu(f, skb, num); | |
524 | break; | |
dc99f600 DM |
525 | } |
526 | ||
dc99f600 DM |
527 | po = pkt_sk(sk); |
528 | ||
529 | return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev); | |
530 | } | |
531 | ||
532 | static DEFINE_MUTEX(fanout_mutex); | |
533 | static LIST_HEAD(fanout_list); | |
534 | ||
535 | static void __fanout_link(struct sock *sk, struct packet_sock *po) | |
536 | { | |
537 | struct packet_fanout *f = po->fanout; | |
538 | ||
539 | spin_lock(&f->lock); | |
540 | f->arr[f->num_members] = sk; | |
541 | smp_wmb(); | |
542 | f->num_members++; | |
543 | spin_unlock(&f->lock); | |
544 | } | |
545 | ||
546 | static void __fanout_unlink(struct sock *sk, struct packet_sock *po) | |
547 | { | |
548 | struct packet_fanout *f = po->fanout; | |
549 | int i; | |
550 | ||
551 | spin_lock(&f->lock); | |
552 | for (i = 0; i < f->num_members; i++) { | |
553 | if (f->arr[i] == sk) | |
554 | break; | |
555 | } | |
556 | BUG_ON(i >= f->num_members); | |
557 | f->arr[i] = f->arr[f->num_members - 1]; | |
558 | f->num_members--; | |
559 | spin_unlock(&f->lock); | |
560 | } | |
561 | ||
7736d33f | 562 | static int fanout_add(struct sock *sk, u16 id, u16 type_flags) |
dc99f600 DM |
563 | { |
564 | struct packet_sock *po = pkt_sk(sk); | |
565 | struct packet_fanout *f, *match; | |
7736d33f DM |
566 | u8 type = type_flags & 0xff; |
567 | u8 defrag = (type_flags & PACKET_FANOUT_FLAG_DEFRAG) ? 1 : 0; | |
dc99f600 DM |
568 | int err; |
569 | ||
570 | switch (type) { | |
571 | case PACKET_FANOUT_HASH: | |
572 | case PACKET_FANOUT_LB: | |
95ec3eb4 | 573 | case PACKET_FANOUT_CPU: |
dc99f600 DM |
574 | break; |
575 | default: | |
576 | return -EINVAL; | |
577 | } | |
578 | ||
579 | if (!po->running) | |
580 | return -EINVAL; | |
581 | ||
582 | if (po->fanout) | |
583 | return -EALREADY; | |
584 | ||
585 | mutex_lock(&fanout_mutex); | |
586 | match = NULL; | |
587 | list_for_each_entry(f, &fanout_list, list) { | |
588 | if (f->id == id && | |
589 | read_pnet(&f->net) == sock_net(sk)) { | |
590 | match = f; | |
591 | break; | |
592 | } | |
593 | } | |
afe62c68 | 594 | err = -EINVAL; |
7736d33f | 595 | if (match && match->defrag != defrag) |
afe62c68 | 596 | goto out; |
dc99f600 | 597 | if (!match) { |
afe62c68 | 598 | err = -ENOMEM; |
dc99f600 | 599 | match = kzalloc(sizeof(*match), GFP_KERNEL); |
afe62c68 ED |
600 | if (!match) |
601 | goto out; | |
602 | write_pnet(&match->net, sock_net(sk)); | |
603 | match->id = id; | |
604 | match->type = type; | |
605 | match->defrag = defrag; | |
606 | atomic_set(&match->rr_cur, 0); | |
607 | INIT_LIST_HEAD(&match->list); | |
608 | spin_lock_init(&match->lock); | |
609 | atomic_set(&match->sk_ref, 0); | |
610 | match->prot_hook.type = po->prot_hook.type; | |
611 | match->prot_hook.dev = po->prot_hook.dev; | |
612 | match->prot_hook.func = packet_rcv_fanout; | |
613 | match->prot_hook.af_packet_priv = match; | |
614 | dev_add_pack(&match->prot_hook); | |
615 | list_add(&match->list, &fanout_list); | |
dc99f600 | 616 | } |
afe62c68 ED |
617 | err = -EINVAL; |
618 | if (match->type == type && | |
619 | match->prot_hook.type == po->prot_hook.type && | |
620 | match->prot_hook.dev == po->prot_hook.dev) { | |
621 | err = -ENOSPC; | |
622 | if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) { | |
623 | __dev_remove_pack(&po->prot_hook); | |
624 | po->fanout = match; | |
625 | atomic_inc(&match->sk_ref); | |
626 | __fanout_link(sk, po); | |
627 | err = 0; | |
dc99f600 DM |
628 | } |
629 | } | |
afe62c68 | 630 | out: |
dc99f600 DM |
631 | mutex_unlock(&fanout_mutex); |
632 | return err; | |
633 | } | |
634 | ||
635 | static void fanout_release(struct sock *sk) | |
636 | { | |
637 | struct packet_sock *po = pkt_sk(sk); | |
638 | struct packet_fanout *f; | |
639 | ||
640 | f = po->fanout; | |
641 | if (!f) | |
642 | return; | |
643 | ||
644 | po->fanout = NULL; | |
645 | ||
646 | mutex_lock(&fanout_mutex); | |
647 | if (atomic_dec_and_test(&f->sk_ref)) { | |
648 | list_del(&f->list); | |
649 | dev_remove_pack(&f->prot_hook); | |
650 | kfree(f); | |
651 | } | |
652 | mutex_unlock(&fanout_mutex); | |
653 | } | |
1da177e4 | 654 | |
90ddc4f0 | 655 | static const struct proto_ops packet_ops; |
1da177e4 | 656 | |
90ddc4f0 | 657 | static const struct proto_ops packet_ops_spkt; |
1da177e4 | 658 | |
40d4e3df ED |
659 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
660 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
661 | { |
662 | struct sock *sk; | |
663 | struct sockaddr_pkt *spkt; | |
664 | ||
665 | /* | |
666 | * When we registered the protocol we saved the socket in the data | |
667 | * field for just this event. | |
668 | */ | |
669 | ||
670 | sk = pt->af_packet_priv; | |
1ce4f28b | 671 | |
1da177e4 LT |
672 | /* |
673 | * Yank back the headers [hope the device set this | |
674 | * right or kerboom...] | |
675 | * | |
676 | * Incoming packets have ll header pulled, | |
677 | * push it back. | |
678 | * | |
98e399f8 | 679 | * For outgoing ones skb->data == skb_mac_header(skb) |
1da177e4 LT |
680 | * so that this procedure is noop. |
681 | */ | |
682 | ||
683 | if (skb->pkt_type == PACKET_LOOPBACK) | |
684 | goto out; | |
685 | ||
09ad9bc7 | 686 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
687 | goto out; |
688 | ||
40d4e3df ED |
689 | skb = skb_share_check(skb, GFP_ATOMIC); |
690 | if (skb == NULL) | |
1da177e4 LT |
691 | goto oom; |
692 | ||
693 | /* drop any routing info */ | |
adf30907 | 694 | skb_dst_drop(skb); |
1da177e4 | 695 | |
84531c24 PO |
696 | /* drop conntrack reference */ |
697 | nf_reset(skb); | |
698 | ||
ffbc6111 | 699 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
1da177e4 | 700 | |
98e399f8 | 701 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
702 | |
703 | /* | |
704 | * The SOCK_PACKET socket receives _all_ frames. | |
705 | */ | |
706 | ||
707 | spkt->spkt_family = dev->type; | |
708 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
709 | spkt->spkt_protocol = skb->protocol; | |
710 | ||
711 | /* | |
712 | * Charge the memory to the socket. This is done specifically | |
713 | * to prevent sockets using all the memory up. | |
714 | */ | |
715 | ||
40d4e3df | 716 | if (sock_queue_rcv_skb(sk, skb) == 0) |
1da177e4 LT |
717 | return 0; |
718 | ||
719 | out: | |
720 | kfree_skb(skb); | |
721 | oom: | |
722 | return 0; | |
723 | } | |
724 | ||
725 | ||
726 | /* | |
727 | * Output a raw packet to a device layer. This bypasses all the other | |
728 | * protocol layers and you must therefore supply it with a complete frame | |
729 | */ | |
1ce4f28b | 730 | |
1da177e4 LT |
731 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, |
732 | struct msghdr *msg, size_t len) | |
733 | { | |
734 | struct sock *sk = sock->sk; | |
40d4e3df | 735 | struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name; |
1a35ca80 | 736 | struct sk_buff *skb = NULL; |
1da177e4 | 737 | struct net_device *dev; |
40d4e3df | 738 | __be16 proto = 0; |
1da177e4 | 739 | int err; |
1ce4f28b | 740 | |
1da177e4 | 741 | /* |
1ce4f28b | 742 | * Get and verify the address. |
1da177e4 LT |
743 | */ |
744 | ||
40d4e3df | 745 | if (saddr) { |
1da177e4 | 746 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
40d4e3df ED |
747 | return -EINVAL; |
748 | if (msg->msg_namelen == sizeof(struct sockaddr_pkt)) | |
749 | proto = saddr->spkt_protocol; | |
750 | } else | |
751 | return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */ | |
1da177e4 LT |
752 | |
753 | /* | |
1ce4f28b | 754 | * Find the device first to size check it |
1da177e4 LT |
755 | */ |
756 | ||
757 | saddr->spkt_device[13] = 0; | |
1a35ca80 | 758 | retry: |
654d1f8a ED |
759 | rcu_read_lock(); |
760 | dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); | |
1da177e4 LT |
761 | err = -ENODEV; |
762 | if (dev == NULL) | |
763 | goto out_unlock; | |
1ce4f28b | 764 | |
d5e76b0a DM |
765 | err = -ENETDOWN; |
766 | if (!(dev->flags & IFF_UP)) | |
767 | goto out_unlock; | |
768 | ||
1da177e4 | 769 | /* |
40d4e3df ED |
770 | * You may not queue a frame bigger than the mtu. This is the lowest level |
771 | * raw protocol and you must do your own fragmentation at this level. | |
1da177e4 | 772 | */ |
1ce4f28b | 773 | |
1da177e4 | 774 | err = -EMSGSIZE; |
57f89bfa | 775 | if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN) |
1da177e4 LT |
776 | goto out_unlock; |
777 | ||
1a35ca80 ED |
778 | if (!skb) { |
779 | size_t reserved = LL_RESERVED_SPACE(dev); | |
780 | unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0; | |
781 | ||
782 | rcu_read_unlock(); | |
783 | skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL); | |
784 | if (skb == NULL) | |
785 | return -ENOBUFS; | |
786 | /* FIXME: Save some space for broken drivers that write a hard | |
787 | * header at transmission time by themselves. PPP is the notable | |
788 | * one here. This should really be fixed at the driver level. | |
789 | */ | |
790 | skb_reserve(skb, reserved); | |
791 | skb_reset_network_header(skb); | |
792 | ||
793 | /* Try to align data part correctly */ | |
794 | if (hhlen) { | |
795 | skb->data -= hhlen; | |
796 | skb->tail -= hhlen; | |
797 | if (len < hhlen) | |
798 | skb_reset_network_header(skb); | |
799 | } | |
800 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
801 | if (err) | |
802 | goto out_free; | |
803 | goto retry; | |
1da177e4 LT |
804 | } |
805 | ||
57f89bfa BG |
806 | if (len > (dev->mtu + dev->hard_header_len)) { |
807 | /* Earlier code assumed this would be a VLAN pkt, | |
808 | * double-check this now that we have the actual | |
809 | * packet in hand. | |
810 | */ | |
811 | struct ethhdr *ehdr; | |
812 | skb_reset_mac_header(skb); | |
813 | ehdr = eth_hdr(skb); | |
814 | if (ehdr->h_proto != htons(ETH_P_8021Q)) { | |
815 | err = -EMSGSIZE; | |
816 | goto out_unlock; | |
817 | } | |
818 | } | |
1a35ca80 | 819 | |
1da177e4 LT |
820 | skb->protocol = proto; |
821 | skb->dev = dev; | |
822 | skb->priority = sk->sk_priority; | |
2d37a186 | 823 | skb->mark = sk->sk_mark; |
2244d07b | 824 | err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
ed85b565 RC |
825 | if (err < 0) |
826 | goto out_unlock; | |
1da177e4 LT |
827 | |
828 | dev_queue_xmit(skb); | |
654d1f8a | 829 | rcu_read_unlock(); |
40d4e3df | 830 | return len; |
1da177e4 | 831 | |
1da177e4 | 832 | out_unlock: |
654d1f8a | 833 | rcu_read_unlock(); |
1a35ca80 ED |
834 | out_free: |
835 | kfree_skb(skb); | |
1da177e4 LT |
836 | return err; |
837 | } | |
1da177e4 | 838 | |
62ab0812 ED |
839 | static inline unsigned int run_filter(const struct sk_buff *skb, |
840 | const struct sock *sk, | |
dbcb5855 | 841 | unsigned int res) |
1da177e4 LT |
842 | { |
843 | struct sk_filter *filter; | |
fda9ef5d | 844 | |
80f8f102 ED |
845 | rcu_read_lock(); |
846 | filter = rcu_dereference(sk->sk_filter); | |
dbcb5855 | 847 | if (filter != NULL) |
0a14842f | 848 | res = SK_RUN_FILTER(filter, skb); |
80f8f102 | 849 | rcu_read_unlock(); |
1da177e4 | 850 | |
dbcb5855 | 851 | return res; |
1da177e4 LT |
852 | } |
853 | ||
854 | /* | |
62ab0812 ED |
855 | * This function makes lazy skb cloning in hope that most of packets |
856 | * are discarded by BPF. | |
857 | * | |
858 | * Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
859 | * and skb->cb are mangled. It works because (and until) packets | |
860 | * falling here are owned by current CPU. Output packets are cloned | |
861 | * by dev_queue_xmit_nit(), input packets are processed by net_bh | |
862 | * sequencially, so that if we return skb to original state on exit, | |
863 | * we will not harm anyone. | |
1da177e4 LT |
864 | */ |
865 | ||
40d4e3df ED |
866 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
867 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
868 | { |
869 | struct sock *sk; | |
870 | struct sockaddr_ll *sll; | |
871 | struct packet_sock *po; | |
40d4e3df | 872 | u8 *skb_head = skb->data; |
1da177e4 | 873 | int skb_len = skb->len; |
dbcb5855 | 874 | unsigned int snaplen, res; |
1da177e4 LT |
875 | |
876 | if (skb->pkt_type == PACKET_LOOPBACK) | |
877 | goto drop; | |
878 | ||
879 | sk = pt->af_packet_priv; | |
880 | po = pkt_sk(sk); | |
881 | ||
09ad9bc7 | 882 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
883 | goto drop; |
884 | ||
1da177e4 LT |
885 | skb->dev = dev; |
886 | ||
3b04ddde | 887 | if (dev->header_ops) { |
1da177e4 | 888 | /* The device has an explicit notion of ll header, |
62ab0812 ED |
889 | * exported to higher levels. |
890 | * | |
891 | * Otherwise, the device hides details of its frame | |
892 | * structure, so that corresponding packet head is | |
893 | * never delivered to user. | |
1da177e4 LT |
894 | */ |
895 | if (sk->sk_type != SOCK_DGRAM) | |
98e399f8 | 896 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
897 | else if (skb->pkt_type == PACKET_OUTGOING) { |
898 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 899 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
900 | } |
901 | } | |
902 | ||
903 | snaplen = skb->len; | |
904 | ||
dbcb5855 DM |
905 | res = run_filter(skb, sk, snaplen); |
906 | if (!res) | |
fda9ef5d | 907 | goto drop_n_restore; |
dbcb5855 DM |
908 | if (snaplen > res) |
909 | snaplen = res; | |
1da177e4 LT |
910 | |
911 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
912 | (unsigned)sk->sk_rcvbuf) | |
913 | goto drop_n_acct; | |
914 | ||
915 | if (skb_shared(skb)) { | |
916 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
917 | if (nskb == NULL) | |
918 | goto drop_n_acct; | |
919 | ||
920 | if (skb_head != skb->data) { | |
921 | skb->data = skb_head; | |
922 | skb->len = skb_len; | |
923 | } | |
924 | kfree_skb(skb); | |
925 | skb = nskb; | |
926 | } | |
927 | ||
ffbc6111 HX |
928 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
929 | sizeof(skb->cb)); | |
930 | ||
931 | sll = &PACKET_SKB_CB(skb)->sa.ll; | |
1da177e4 LT |
932 | sll->sll_family = AF_PACKET; |
933 | sll->sll_hatype = dev->type; | |
934 | sll->sll_protocol = skb->protocol; | |
935 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 936 | if (unlikely(po->origdev)) |
80feaacb PWJ |
937 | sll->sll_ifindex = orig_dev->ifindex; |
938 | else | |
939 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 940 | |
b95cce35 | 941 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 | 942 | |
ffbc6111 | 943 | PACKET_SKB_CB(skb)->origlen = skb->len; |
8dc41944 | 944 | |
1da177e4 LT |
945 | if (pskb_trim(skb, snaplen)) |
946 | goto drop_n_acct; | |
947 | ||
948 | skb_set_owner_r(skb, sk); | |
949 | skb->dev = NULL; | |
adf30907 | 950 | skb_dst_drop(skb); |
1da177e4 | 951 | |
84531c24 PO |
952 | /* drop conntrack reference */ |
953 | nf_reset(skb); | |
954 | ||
1da177e4 LT |
955 | spin_lock(&sk->sk_receive_queue.lock); |
956 | po->stats.tp_packets++; | |
3b885787 | 957 | skb->dropcount = atomic_read(&sk->sk_drops); |
1da177e4 LT |
958 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
959 | spin_unlock(&sk->sk_receive_queue.lock); | |
960 | sk->sk_data_ready(sk, skb->len); | |
961 | return 0; | |
962 | ||
963 | drop_n_acct: | |
3b885787 | 964 | po->stats.tp_drops = atomic_inc_return(&sk->sk_drops); |
1da177e4 LT |
965 | |
966 | drop_n_restore: | |
967 | if (skb_head != skb->data && skb_shared(skb)) { | |
968 | skb->data = skb_head; | |
969 | skb->len = skb_len; | |
970 | } | |
971 | drop: | |
ead2ceb0 | 972 | consume_skb(skb); |
1da177e4 LT |
973 | return 0; |
974 | } | |
975 | ||
40d4e3df ED |
976 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
977 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
978 | { |
979 | struct sock *sk; | |
980 | struct packet_sock *po; | |
981 | struct sockaddr_ll *sll; | |
bbd6ef87 PM |
982 | union { |
983 | struct tpacket_hdr *h1; | |
984 | struct tpacket2_hdr *h2; | |
985 | void *raw; | |
986 | } h; | |
40d4e3df | 987 | u8 *skb_head = skb->data; |
1da177e4 | 988 | int skb_len = skb->len; |
dbcb5855 | 989 | unsigned int snaplen, res; |
1da177e4 | 990 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
bbd6ef87 | 991 | unsigned short macoff, netoff, hdrlen; |
1da177e4 | 992 | struct sk_buff *copy_skb = NULL; |
b7aa0bf7 | 993 | struct timeval tv; |
bbd6ef87 | 994 | struct timespec ts; |
614f60fa | 995 | struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb); |
1da177e4 LT |
996 | |
997 | if (skb->pkt_type == PACKET_LOOPBACK) | |
998 | goto drop; | |
999 | ||
1000 | sk = pt->af_packet_priv; | |
1001 | po = pkt_sk(sk); | |
1002 | ||
09ad9bc7 | 1003 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
1004 | goto drop; |
1005 | ||
3b04ddde | 1006 | if (dev->header_ops) { |
1da177e4 | 1007 | if (sk->sk_type != SOCK_DGRAM) |
98e399f8 | 1008 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
1009 | else if (skb->pkt_type == PACKET_OUTGOING) { |
1010 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 1011 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
1012 | } |
1013 | } | |
1014 | ||
8dc41944 HX |
1015 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
1016 | status |= TP_STATUS_CSUMNOTREADY; | |
1017 | ||
1da177e4 LT |
1018 | snaplen = skb->len; |
1019 | ||
dbcb5855 DM |
1020 | res = run_filter(skb, sk, snaplen); |
1021 | if (!res) | |
fda9ef5d | 1022 | goto drop_n_restore; |
dbcb5855 DM |
1023 | if (snaplen > res) |
1024 | snaplen = res; | |
1da177e4 LT |
1025 | |
1026 | if (sk->sk_type == SOCK_DGRAM) { | |
8913336a PM |
1027 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
1028 | po->tp_reserve; | |
1da177e4 | 1029 | } else { |
bbe735e4 | 1030 | unsigned maclen = skb_network_offset(skb); |
bbd6ef87 | 1031 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
8913336a PM |
1032 | (maclen < 16 ? 16 : maclen)) + |
1033 | po->tp_reserve; | |
1da177e4 LT |
1034 | macoff = netoff - maclen; |
1035 | } | |
1036 | ||
69e3c75f | 1037 | if (macoff + snaplen > po->rx_ring.frame_size) { |
1da177e4 LT |
1038 | if (po->copy_thresh && |
1039 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < | |
1040 | (unsigned)sk->sk_rcvbuf) { | |
1041 | if (skb_shared(skb)) { | |
1042 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
1043 | } else { | |
1044 | copy_skb = skb_get(skb); | |
1045 | skb_head = skb->data; | |
1046 | } | |
1047 | if (copy_skb) | |
1048 | skb_set_owner_r(copy_skb, sk); | |
1049 | } | |
69e3c75f | 1050 | snaplen = po->rx_ring.frame_size - macoff; |
1da177e4 LT |
1051 | if ((int)snaplen < 0) |
1052 | snaplen = 0; | |
1053 | } | |
1da177e4 LT |
1054 | |
1055 | spin_lock(&sk->sk_receive_queue.lock); | |
69e3c75f | 1056 | h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL); |
bbd6ef87 | 1057 | if (!h.raw) |
1da177e4 | 1058 | goto ring_is_full; |
69e3c75f | 1059 | packet_increment_head(&po->rx_ring); |
1da177e4 LT |
1060 | po->stats.tp_packets++; |
1061 | if (copy_skb) { | |
1062 | status |= TP_STATUS_COPY; | |
1063 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
1064 | } | |
1065 | if (!po->stats.tp_drops) | |
1066 | status &= ~TP_STATUS_LOSING; | |
1067 | spin_unlock(&sk->sk_receive_queue.lock); | |
1068 | ||
bbd6ef87 | 1069 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
1da177e4 | 1070 | |
bbd6ef87 PM |
1071 | switch (po->tp_version) { |
1072 | case TPACKET_V1: | |
1073 | h.h1->tp_len = skb->len; | |
1074 | h.h1->tp_snaplen = snaplen; | |
1075 | h.h1->tp_mac = macoff; | |
1076 | h.h1->tp_net = netoff; | |
614f60fa SM |
1077 | if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE) |
1078 | && shhwtstamps->syststamp.tv64) | |
1079 | tv = ktime_to_timeval(shhwtstamps->syststamp); | |
1080 | else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE) | |
1081 | && shhwtstamps->hwtstamp.tv64) | |
1082 | tv = ktime_to_timeval(shhwtstamps->hwtstamp); | |
1083 | else if (skb->tstamp.tv64) | |
bbd6ef87 PM |
1084 | tv = ktime_to_timeval(skb->tstamp); |
1085 | else | |
1086 | do_gettimeofday(&tv); | |
1087 | h.h1->tp_sec = tv.tv_sec; | |
1088 | h.h1->tp_usec = tv.tv_usec; | |
1089 | hdrlen = sizeof(*h.h1); | |
1090 | break; | |
1091 | case TPACKET_V2: | |
1092 | h.h2->tp_len = skb->len; | |
1093 | h.h2->tp_snaplen = snaplen; | |
1094 | h.h2->tp_mac = macoff; | |
1095 | h.h2->tp_net = netoff; | |
614f60fa SM |
1096 | if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE) |
1097 | && shhwtstamps->syststamp.tv64) | |
1098 | ts = ktime_to_timespec(shhwtstamps->syststamp); | |
1099 | else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE) | |
1100 | && shhwtstamps->hwtstamp.tv64) | |
1101 | ts = ktime_to_timespec(shhwtstamps->hwtstamp); | |
1102 | else if (skb->tstamp.tv64) | |
bbd6ef87 PM |
1103 | ts = ktime_to_timespec(skb->tstamp); |
1104 | else | |
1105 | getnstimeofday(&ts); | |
1106 | h.h2->tp_sec = ts.tv_sec; | |
1107 | h.h2->tp_nsec = ts.tv_nsec; | |
a3bcc23e BG |
1108 | if (vlan_tx_tag_present(skb)) { |
1109 | h.h2->tp_vlan_tci = vlan_tx_tag_get(skb); | |
1110 | status |= TP_STATUS_VLAN_VALID; | |
1111 | } else { | |
1112 | h.h2->tp_vlan_tci = 0; | |
1113 | } | |
13fcb7bd | 1114 | h.h2->tp_padding = 0; |
bbd6ef87 PM |
1115 | hdrlen = sizeof(*h.h2); |
1116 | break; | |
1117 | default: | |
1118 | BUG(); | |
1119 | } | |
1da177e4 | 1120 | |
bbd6ef87 | 1121 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
b95cce35 | 1122 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 LT |
1123 | sll->sll_family = AF_PACKET; |
1124 | sll->sll_hatype = dev->type; | |
1125 | sll->sll_protocol = skb->protocol; | |
1126 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 1127 | if (unlikely(po->origdev)) |
80feaacb PWJ |
1128 | sll->sll_ifindex = orig_dev->ifindex; |
1129 | else | |
1130 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 1131 | |
e16aa207 | 1132 | smp_mb(); |
f6dafa95 | 1133 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
1da177e4 | 1134 | { |
0af55bb5 CG |
1135 | u8 *start, *end; |
1136 | ||
1137 | end = (u8 *)PAGE_ALIGN((unsigned long)h.raw + macoff + snaplen); | |
1138 | for (start = h.raw; start < end; start += PAGE_SIZE) | |
1139 | flush_dcache_page(pgv_to_page(start)); | |
cc9f01b2 | 1140 | smp_wmb(); |
1da177e4 | 1141 | } |
f6dafa95 | 1142 | #endif |
cc9f01b2 | 1143 | __packet_set_status(po, h.raw, status); |
1da177e4 LT |
1144 | |
1145 | sk->sk_data_ready(sk, 0); | |
1146 | ||
1147 | drop_n_restore: | |
1148 | if (skb_head != skb->data && skb_shared(skb)) { | |
1149 | skb->data = skb_head; | |
1150 | skb->len = skb_len; | |
1151 | } | |
1152 | drop: | |
1ce4f28b | 1153 | kfree_skb(skb); |
1da177e4 LT |
1154 | return 0; |
1155 | ||
1156 | ring_is_full: | |
1157 | po->stats.tp_drops++; | |
1158 | spin_unlock(&sk->sk_receive_queue.lock); | |
1159 | ||
1160 | sk->sk_data_ready(sk, 0); | |
acb5d75b | 1161 | kfree_skb(copy_skb); |
1da177e4 LT |
1162 | goto drop_n_restore; |
1163 | } | |
1164 | ||
69e3c75f JB |
1165 | static void tpacket_destruct_skb(struct sk_buff *skb) |
1166 | { | |
1167 | struct packet_sock *po = pkt_sk(skb->sk); | |
40d4e3df | 1168 | void *ph; |
1da177e4 | 1169 | |
69e3c75f | 1170 | BUG_ON(skb == NULL); |
1da177e4 | 1171 | |
69e3c75f JB |
1172 | if (likely(po->tx_ring.pg_vec)) { |
1173 | ph = skb_shinfo(skb)->destructor_arg; | |
1174 | BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING); | |
1175 | BUG_ON(atomic_read(&po->tx_ring.pending) == 0); | |
1176 | atomic_dec(&po->tx_ring.pending); | |
1177 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE); | |
1178 | } | |
1179 | ||
1180 | sock_wfree(skb); | |
1181 | } | |
1182 | ||
40d4e3df ED |
1183 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
1184 | void *frame, struct net_device *dev, int size_max, | |
1185 | __be16 proto, unsigned char *addr) | |
69e3c75f JB |
1186 | { |
1187 | union { | |
1188 | struct tpacket_hdr *h1; | |
1189 | struct tpacket2_hdr *h2; | |
1190 | void *raw; | |
1191 | } ph; | |
1192 | int to_write, offset, len, tp_len, nr_frags, len_max; | |
1193 | struct socket *sock = po->sk.sk_socket; | |
1194 | struct page *page; | |
1195 | void *data; | |
1196 | int err; | |
1197 | ||
1198 | ph.raw = frame; | |
1199 | ||
1200 | skb->protocol = proto; | |
1201 | skb->dev = dev; | |
1202 | skb->priority = po->sk.sk_priority; | |
2d37a186 | 1203 | skb->mark = po->sk.sk_mark; |
69e3c75f JB |
1204 | skb_shinfo(skb)->destructor_arg = ph.raw; |
1205 | ||
1206 | switch (po->tp_version) { | |
1207 | case TPACKET_V2: | |
1208 | tp_len = ph.h2->tp_len; | |
1209 | break; | |
1210 | default: | |
1211 | tp_len = ph.h1->tp_len; | |
1212 | break; | |
1213 | } | |
1214 | if (unlikely(tp_len > size_max)) { | |
40d4e3df | 1215 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); |
69e3c75f JB |
1216 | return -EMSGSIZE; |
1217 | } | |
1218 | ||
1219 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
1220 | skb_reset_network_header(skb); | |
1221 | ||
1222 | data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll); | |
1223 | to_write = tp_len; | |
1224 | ||
1225 | if (sock->type == SOCK_DGRAM) { | |
1226 | err = dev_hard_header(skb, dev, ntohs(proto), addr, | |
1227 | NULL, tp_len); | |
1228 | if (unlikely(err < 0)) | |
1229 | return -EINVAL; | |
40d4e3df | 1230 | } else if (dev->hard_header_len) { |
69e3c75f JB |
1231 | /* net device doesn't like empty head */ |
1232 | if (unlikely(tp_len <= dev->hard_header_len)) { | |
40d4e3df ED |
1233 | pr_err("packet size is too short (%d < %d)\n", |
1234 | tp_len, dev->hard_header_len); | |
69e3c75f JB |
1235 | return -EINVAL; |
1236 | } | |
1237 | ||
1238 | skb_push(skb, dev->hard_header_len); | |
1239 | err = skb_store_bits(skb, 0, data, | |
1240 | dev->hard_header_len); | |
1241 | if (unlikely(err)) | |
1242 | return err; | |
1243 | ||
1244 | data += dev->hard_header_len; | |
1245 | to_write -= dev->hard_header_len; | |
1246 | } | |
1247 | ||
1248 | err = -EFAULT; | |
69e3c75f JB |
1249 | offset = offset_in_page(data); |
1250 | len_max = PAGE_SIZE - offset; | |
1251 | len = ((to_write > len_max) ? len_max : to_write); | |
1252 | ||
1253 | skb->data_len = to_write; | |
1254 | skb->len += to_write; | |
1255 | skb->truesize += to_write; | |
1256 | atomic_add(to_write, &po->sk.sk_wmem_alloc); | |
1257 | ||
1258 | while (likely(to_write)) { | |
1259 | nr_frags = skb_shinfo(skb)->nr_frags; | |
1260 | ||
1261 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { | |
40d4e3df ED |
1262 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
1263 | MAX_SKB_FRAGS); | |
69e3c75f JB |
1264 | return -EFAULT; |
1265 | } | |
1266 | ||
0af55bb5 CG |
1267 | page = pgv_to_page(data); |
1268 | data += len; | |
69e3c75f JB |
1269 | flush_dcache_page(page); |
1270 | get_page(page); | |
0af55bb5 | 1271 | skb_fill_page_desc(skb, nr_frags, page, offset, len); |
69e3c75f JB |
1272 | to_write -= len; |
1273 | offset = 0; | |
1274 | len_max = PAGE_SIZE; | |
1275 | len = ((to_write > len_max) ? len_max : to_write); | |
1276 | } | |
1277 | ||
1278 | return tp_len; | |
1279 | } | |
1280 | ||
1281 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) | |
1282 | { | |
69e3c75f JB |
1283 | struct sk_buff *skb; |
1284 | struct net_device *dev; | |
1285 | __be16 proto; | |
827d9780 BG |
1286 | bool need_rls_dev = false; |
1287 | int err, reserve = 0; | |
40d4e3df ED |
1288 | void *ph; |
1289 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; | |
69e3c75f JB |
1290 | int tp_len, size_max; |
1291 | unsigned char *addr; | |
1292 | int len_sum = 0; | |
1293 | int status = 0; | |
1294 | ||
69e3c75f JB |
1295 | mutex_lock(&po->pg_vec_lock); |
1296 | ||
1297 | err = -EBUSY; | |
1298 | if (saddr == NULL) { | |
827d9780 | 1299 | dev = po->prot_hook.dev; |
69e3c75f JB |
1300 | proto = po->num; |
1301 | addr = NULL; | |
1302 | } else { | |
1303 | err = -EINVAL; | |
1304 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
1305 | goto out; | |
1306 | if (msg->msg_namelen < (saddr->sll_halen | |
1307 | + offsetof(struct sockaddr_ll, | |
1308 | sll_addr))) | |
1309 | goto out; | |
69e3c75f JB |
1310 | proto = saddr->sll_protocol; |
1311 | addr = saddr->sll_addr; | |
827d9780 BG |
1312 | dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex); |
1313 | need_rls_dev = true; | |
69e3c75f JB |
1314 | } |
1315 | ||
69e3c75f JB |
1316 | err = -ENXIO; |
1317 | if (unlikely(dev == NULL)) | |
1318 | goto out; | |
1319 | ||
1320 | reserve = dev->hard_header_len; | |
1321 | ||
1322 | err = -ENETDOWN; | |
1323 | if (unlikely(!(dev->flags & IFF_UP))) | |
1324 | goto out_put; | |
1325 | ||
1326 | size_max = po->tx_ring.frame_size | |
b5dd884e | 1327 | - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
69e3c75f JB |
1328 | |
1329 | if (size_max > dev->mtu + reserve) | |
1330 | size_max = dev->mtu + reserve; | |
1331 | ||
1332 | do { | |
1333 | ph = packet_current_frame(po, &po->tx_ring, | |
1334 | TP_STATUS_SEND_REQUEST); | |
1335 | ||
1336 | if (unlikely(ph == NULL)) { | |
1337 | schedule(); | |
1338 | continue; | |
1339 | } | |
1340 | ||
1341 | status = TP_STATUS_SEND_REQUEST; | |
1342 | skb = sock_alloc_send_skb(&po->sk, | |
1343 | LL_ALLOCATED_SPACE(dev) | |
1344 | + sizeof(struct sockaddr_ll), | |
1345 | 0, &err); | |
1346 | ||
1347 | if (unlikely(skb == NULL)) | |
1348 | goto out_status; | |
1349 | ||
1350 | tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto, | |
1351 | addr); | |
1352 | ||
1353 | if (unlikely(tp_len < 0)) { | |
1354 | if (po->tp_loss) { | |
1355 | __packet_set_status(po, ph, | |
1356 | TP_STATUS_AVAILABLE); | |
1357 | packet_increment_head(&po->tx_ring); | |
1358 | kfree_skb(skb); | |
1359 | continue; | |
1360 | } else { | |
1361 | status = TP_STATUS_WRONG_FORMAT; | |
1362 | err = tp_len; | |
1363 | goto out_status; | |
1364 | } | |
1365 | } | |
1366 | ||
1367 | skb->destructor = tpacket_destruct_skb; | |
1368 | __packet_set_status(po, ph, TP_STATUS_SENDING); | |
1369 | atomic_inc(&po->tx_ring.pending); | |
1370 | ||
1371 | status = TP_STATUS_SEND_REQUEST; | |
1372 | err = dev_queue_xmit(skb); | |
eb70df13 JP |
1373 | if (unlikely(err > 0)) { |
1374 | err = net_xmit_errno(err); | |
1375 | if (err && __packet_get_status(po, ph) == | |
1376 | TP_STATUS_AVAILABLE) { | |
1377 | /* skb was destructed already */ | |
1378 | skb = NULL; | |
1379 | goto out_status; | |
1380 | } | |
1381 | /* | |
1382 | * skb was dropped but not destructed yet; | |
1383 | * let's treat it like congestion or err < 0 | |
1384 | */ | |
1385 | err = 0; | |
1386 | } | |
69e3c75f JB |
1387 | packet_increment_head(&po->tx_ring); |
1388 | len_sum += tp_len; | |
f64f9e71 JP |
1389 | } while (likely((ph != NULL) || |
1390 | ((!(msg->msg_flags & MSG_DONTWAIT)) && | |
1391 | (atomic_read(&po->tx_ring.pending)))) | |
1392 | ); | |
69e3c75f JB |
1393 | |
1394 | err = len_sum; | |
1395 | goto out_put; | |
1396 | ||
69e3c75f JB |
1397 | out_status: |
1398 | __packet_set_status(po, ph, status); | |
1399 | kfree_skb(skb); | |
1400 | out_put: | |
827d9780 BG |
1401 | if (need_rls_dev) |
1402 | dev_put(dev); | |
69e3c75f JB |
1403 | out: |
1404 | mutex_unlock(&po->pg_vec_lock); | |
1405 | return err; | |
1406 | } | |
69e3c75f | 1407 | |
bfd5f4a3 SS |
1408 | static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad, |
1409 | size_t reserve, size_t len, | |
1410 | size_t linear, int noblock, | |
1411 | int *err) | |
1412 | { | |
1413 | struct sk_buff *skb; | |
1414 | ||
1415 | /* Under a page? Don't bother with paged skb. */ | |
1416 | if (prepad + len < PAGE_SIZE || !linear) | |
1417 | linear = len; | |
1418 | ||
1419 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, | |
1420 | err); | |
1421 | if (!skb) | |
1422 | return NULL; | |
1423 | ||
1424 | skb_reserve(skb, reserve); | |
1425 | skb_put(skb, linear); | |
1426 | skb->data_len = len - linear; | |
1427 | skb->len += len - linear; | |
1428 | ||
1429 | return skb; | |
1430 | } | |
1431 | ||
69e3c75f | 1432 | static int packet_snd(struct socket *sock, |
1da177e4 LT |
1433 | struct msghdr *msg, size_t len) |
1434 | { | |
1435 | struct sock *sk = sock->sk; | |
40d4e3df | 1436 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
1da177e4 LT |
1437 | struct sk_buff *skb; |
1438 | struct net_device *dev; | |
0e11c91e | 1439 | __be16 proto; |
827d9780 | 1440 | bool need_rls_dev = false; |
1da177e4 | 1441 | unsigned char *addr; |
827d9780 | 1442 | int err, reserve = 0; |
bfd5f4a3 SS |
1443 | struct virtio_net_hdr vnet_hdr = { 0 }; |
1444 | int offset = 0; | |
1445 | int vnet_hdr_len; | |
1446 | struct packet_sock *po = pkt_sk(sk); | |
1447 | unsigned short gso_type = 0; | |
1da177e4 LT |
1448 | |
1449 | /* | |
1ce4f28b | 1450 | * Get and verify the address. |
1da177e4 | 1451 | */ |
1ce4f28b | 1452 | |
1da177e4 | 1453 | if (saddr == NULL) { |
827d9780 | 1454 | dev = po->prot_hook.dev; |
1da177e4 LT |
1455 | proto = po->num; |
1456 | addr = NULL; | |
1457 | } else { | |
1458 | err = -EINVAL; | |
1459 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
1460 | goto out; | |
0fb375fb EB |
1461 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
1462 | goto out; | |
1da177e4 LT |
1463 | proto = saddr->sll_protocol; |
1464 | addr = saddr->sll_addr; | |
827d9780 BG |
1465 | dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex); |
1466 | need_rls_dev = true; | |
1da177e4 LT |
1467 | } |
1468 | ||
1da177e4 LT |
1469 | err = -ENXIO; |
1470 | if (dev == NULL) | |
1471 | goto out_unlock; | |
1472 | if (sock->type == SOCK_RAW) | |
1473 | reserve = dev->hard_header_len; | |
1474 | ||
d5e76b0a DM |
1475 | err = -ENETDOWN; |
1476 | if (!(dev->flags & IFF_UP)) | |
1477 | goto out_unlock; | |
1478 | ||
bfd5f4a3 SS |
1479 | if (po->has_vnet_hdr) { |
1480 | vnet_hdr_len = sizeof(vnet_hdr); | |
1481 | ||
1482 | err = -EINVAL; | |
1483 | if (len < vnet_hdr_len) | |
1484 | goto out_unlock; | |
1485 | ||
1486 | len -= vnet_hdr_len; | |
1487 | ||
1488 | err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov, | |
1489 | vnet_hdr_len); | |
1490 | if (err < 0) | |
1491 | goto out_unlock; | |
1492 | ||
1493 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && | |
1494 | (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 > | |
1495 | vnet_hdr.hdr_len)) | |
1496 | vnet_hdr.hdr_len = vnet_hdr.csum_start + | |
1497 | vnet_hdr.csum_offset + 2; | |
1498 | ||
1499 | err = -EINVAL; | |
1500 | if (vnet_hdr.hdr_len > len) | |
1501 | goto out_unlock; | |
1502 | ||
1503 | if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
1504 | switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
1505 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
1506 | gso_type = SKB_GSO_TCPV4; | |
1507 | break; | |
1508 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
1509 | gso_type = SKB_GSO_TCPV6; | |
1510 | break; | |
1511 | case VIRTIO_NET_HDR_GSO_UDP: | |
1512 | gso_type = SKB_GSO_UDP; | |
1513 | break; | |
1514 | default: | |
1515 | goto out_unlock; | |
1516 | } | |
1517 | ||
1518 | if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
1519 | gso_type |= SKB_GSO_TCP_ECN; | |
1520 | ||
1521 | if (vnet_hdr.gso_size == 0) | |
1522 | goto out_unlock; | |
1523 | ||
1524 | } | |
1525 | } | |
1526 | ||
1da177e4 | 1527 | err = -EMSGSIZE; |
57f89bfa | 1528 | if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN)) |
1da177e4 LT |
1529 | goto out_unlock; |
1530 | ||
bfd5f4a3 SS |
1531 | err = -ENOBUFS; |
1532 | skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev), | |
1533 | LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len, | |
1534 | msg->msg_flags & MSG_DONTWAIT, &err); | |
40d4e3df | 1535 | if (skb == NULL) |
1da177e4 LT |
1536 | goto out_unlock; |
1537 | ||
bfd5f4a3 | 1538 | skb_set_network_header(skb, reserve); |
1da177e4 | 1539 | |
0c4e8581 SH |
1540 | err = -EINVAL; |
1541 | if (sock->type == SOCK_DGRAM && | |
bfd5f4a3 | 1542 | (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0) |
0c4e8581 | 1543 | goto out_free; |
1da177e4 LT |
1544 | |
1545 | /* Returns -EFAULT on error */ | |
bfd5f4a3 | 1546 | err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len); |
1da177e4 LT |
1547 | if (err) |
1548 | goto out_free; | |
2244d07b | 1549 | err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
ed85b565 RC |
1550 | if (err < 0) |
1551 | goto out_free; | |
1da177e4 | 1552 | |
57f89bfa BG |
1553 | if (!gso_type && (len > dev->mtu + reserve)) { |
1554 | /* Earlier code assumed this would be a VLAN pkt, | |
1555 | * double-check this now that we have the actual | |
1556 | * packet in hand. | |
1557 | */ | |
1558 | struct ethhdr *ehdr; | |
1559 | skb_reset_mac_header(skb); | |
1560 | ehdr = eth_hdr(skb); | |
1561 | if (ehdr->h_proto != htons(ETH_P_8021Q)) { | |
1562 | err = -EMSGSIZE; | |
1563 | goto out_free; | |
1564 | } | |
1565 | } | |
1566 | ||
1da177e4 LT |
1567 | skb->protocol = proto; |
1568 | skb->dev = dev; | |
1569 | skb->priority = sk->sk_priority; | |
2d37a186 | 1570 | skb->mark = sk->sk_mark; |
1da177e4 | 1571 | |
bfd5f4a3 SS |
1572 | if (po->has_vnet_hdr) { |
1573 | if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
1574 | if (!skb_partial_csum_set(skb, vnet_hdr.csum_start, | |
1575 | vnet_hdr.csum_offset)) { | |
1576 | err = -EINVAL; | |
1577 | goto out_free; | |
1578 | } | |
1579 | } | |
1580 | ||
1581 | skb_shinfo(skb)->gso_size = vnet_hdr.gso_size; | |
1582 | skb_shinfo(skb)->gso_type = gso_type; | |
1583 | ||
1584 | /* Header must be checked, and gso_segs computed. */ | |
1585 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
1586 | skb_shinfo(skb)->gso_segs = 0; | |
1587 | ||
1588 | len += vnet_hdr_len; | |
1589 | } | |
1590 | ||
1da177e4 LT |
1591 | /* |
1592 | * Now send it | |
1593 | */ | |
1594 | ||
1595 | err = dev_queue_xmit(skb); | |
1596 | if (err > 0 && (err = net_xmit_errno(err)) != 0) | |
1597 | goto out_unlock; | |
1598 | ||
827d9780 BG |
1599 | if (need_rls_dev) |
1600 | dev_put(dev); | |
1da177e4 | 1601 | |
40d4e3df | 1602 | return len; |
1da177e4 LT |
1603 | |
1604 | out_free: | |
1605 | kfree_skb(skb); | |
1606 | out_unlock: | |
827d9780 | 1607 | if (dev && need_rls_dev) |
1da177e4 LT |
1608 | dev_put(dev); |
1609 | out: | |
1610 | return err; | |
1611 | } | |
1612 | ||
69e3c75f JB |
1613 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
1614 | struct msghdr *msg, size_t len) | |
1615 | { | |
69e3c75f JB |
1616 | struct sock *sk = sock->sk; |
1617 | struct packet_sock *po = pkt_sk(sk); | |
1618 | if (po->tx_ring.pg_vec) | |
1619 | return tpacket_snd(po, msg); | |
1620 | else | |
69e3c75f JB |
1621 | return packet_snd(sock, msg, len); |
1622 | } | |
1623 | ||
1da177e4 LT |
1624 | /* |
1625 | * Close a PACKET socket. This is fairly simple. We immediately go | |
1626 | * to 'closed' state and remove our protocol entry in the device list. | |
1627 | */ | |
1628 | ||
1629 | static int packet_release(struct socket *sock) | |
1630 | { | |
1631 | struct sock *sk = sock->sk; | |
1632 | struct packet_sock *po; | |
d12d01d6 | 1633 | struct net *net; |
69e3c75f | 1634 | struct tpacket_req req; |
1da177e4 LT |
1635 | |
1636 | if (!sk) | |
1637 | return 0; | |
1638 | ||
3b1e0a65 | 1639 | net = sock_net(sk); |
1da177e4 LT |
1640 | po = pkt_sk(sk); |
1641 | ||
808f5114 | 1642 | spin_lock_bh(&net->packet.sklist_lock); |
1643 | sk_del_node_init_rcu(sk); | |
920de804 | 1644 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
808f5114 | 1645 | spin_unlock_bh(&net->packet.sklist_lock); |
1da177e4 | 1646 | |
808f5114 | 1647 | spin_lock(&po->bind_lock); |
ce06b03e | 1648 | unregister_prot_hook(sk, false); |
160ff18a BG |
1649 | if (po->prot_hook.dev) { |
1650 | dev_put(po->prot_hook.dev); | |
1651 | po->prot_hook.dev = NULL; | |
1652 | } | |
808f5114 | 1653 | spin_unlock(&po->bind_lock); |
1da177e4 | 1654 | |
1da177e4 | 1655 | packet_flush_mclist(sk); |
1da177e4 | 1656 | |
69e3c75f JB |
1657 | memset(&req, 0, sizeof(req)); |
1658 | ||
1659 | if (po->rx_ring.pg_vec) | |
1660 | packet_set_ring(sk, &req, 1, 0); | |
1661 | ||
1662 | if (po->tx_ring.pg_vec) | |
1663 | packet_set_ring(sk, &req, 1, 1); | |
1da177e4 | 1664 | |
dc99f600 DM |
1665 | fanout_release(sk); |
1666 | ||
808f5114 | 1667 | synchronize_net(); |
1da177e4 LT |
1668 | /* |
1669 | * Now the socket is dead. No more input will appear. | |
1670 | */ | |
1da177e4 LT |
1671 | sock_orphan(sk); |
1672 | sock->sk = NULL; | |
1673 | ||
1674 | /* Purge queues */ | |
1675 | ||
1676 | skb_queue_purge(&sk->sk_receive_queue); | |
17ab56a2 | 1677 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
1678 | |
1679 | sock_put(sk); | |
1680 | return 0; | |
1681 | } | |
1682 | ||
1683 | /* | |
1684 | * Attach a packet hook. | |
1685 | */ | |
1686 | ||
0e11c91e | 1687 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
1da177e4 LT |
1688 | { |
1689 | struct packet_sock *po = pkt_sk(sk); | |
dc99f600 DM |
1690 | |
1691 | if (po->fanout) | |
1692 | return -EINVAL; | |
1da177e4 LT |
1693 | |
1694 | lock_sock(sk); | |
1695 | ||
1696 | spin_lock(&po->bind_lock); | |
ce06b03e | 1697 | unregister_prot_hook(sk, true); |
1da177e4 LT |
1698 | po->num = protocol; |
1699 | po->prot_hook.type = protocol; | |
160ff18a BG |
1700 | if (po->prot_hook.dev) |
1701 | dev_put(po->prot_hook.dev); | |
1da177e4 LT |
1702 | po->prot_hook.dev = dev; |
1703 | ||
1704 | po->ifindex = dev ? dev->ifindex : 0; | |
1705 | ||
1706 | if (protocol == 0) | |
1707 | goto out_unlock; | |
1708 | ||
be85d4ad | 1709 | if (!dev || (dev->flags & IFF_UP)) { |
ce06b03e | 1710 | register_prot_hook(sk); |
be85d4ad UT |
1711 | } else { |
1712 | sk->sk_err = ENETDOWN; | |
1713 | if (!sock_flag(sk, SOCK_DEAD)) | |
1714 | sk->sk_error_report(sk); | |
1da177e4 LT |
1715 | } |
1716 | ||
1717 | out_unlock: | |
1718 | spin_unlock(&po->bind_lock); | |
1719 | release_sock(sk); | |
1720 | return 0; | |
1721 | } | |
1722 | ||
1723 | /* | |
1724 | * Bind a packet socket to a device | |
1725 | */ | |
1726 | ||
40d4e3df ED |
1727 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
1728 | int addr_len) | |
1da177e4 | 1729 | { |
40d4e3df | 1730 | struct sock *sk = sock->sk; |
1da177e4 LT |
1731 | char name[15]; |
1732 | struct net_device *dev; | |
1733 | int err = -ENODEV; | |
1ce4f28b | 1734 | |
1da177e4 LT |
1735 | /* |
1736 | * Check legality | |
1737 | */ | |
1ce4f28b | 1738 | |
8ae55f04 | 1739 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 | 1740 | return -EINVAL; |
40d4e3df | 1741 | strlcpy(name, uaddr->sa_data, sizeof(name)); |
1da177e4 | 1742 | |
3b1e0a65 | 1743 | dev = dev_get_by_name(sock_net(sk), name); |
160ff18a | 1744 | if (dev) |
1da177e4 | 1745 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); |
1da177e4 LT |
1746 | return err; |
1747 | } | |
1da177e4 LT |
1748 | |
1749 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
1750 | { | |
40d4e3df ED |
1751 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
1752 | struct sock *sk = sock->sk; | |
1da177e4 LT |
1753 | struct net_device *dev = NULL; |
1754 | int err; | |
1755 | ||
1756 | ||
1757 | /* | |
1758 | * Check legality | |
1759 | */ | |
1ce4f28b | 1760 | |
1da177e4 LT |
1761 | if (addr_len < sizeof(struct sockaddr_ll)) |
1762 | return -EINVAL; | |
1763 | if (sll->sll_family != AF_PACKET) | |
1764 | return -EINVAL; | |
1765 | ||
1766 | if (sll->sll_ifindex) { | |
1767 | err = -ENODEV; | |
3b1e0a65 | 1768 | dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex); |
1da177e4 LT |
1769 | if (dev == NULL) |
1770 | goto out; | |
1771 | } | |
1772 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
1da177e4 LT |
1773 | |
1774 | out: | |
1775 | return err; | |
1776 | } | |
1777 | ||
1778 | static struct proto packet_proto = { | |
1779 | .name = "PACKET", | |
1780 | .owner = THIS_MODULE, | |
1781 | .obj_size = sizeof(struct packet_sock), | |
1782 | }; | |
1783 | ||
1784 | /* | |
1ce4f28b | 1785 | * Create a packet of type SOCK_PACKET. |
1da177e4 LT |
1786 | */ |
1787 | ||
3f378b68 EP |
1788 | static int packet_create(struct net *net, struct socket *sock, int protocol, |
1789 | int kern) | |
1da177e4 LT |
1790 | { |
1791 | struct sock *sk; | |
1792 | struct packet_sock *po; | |
0e11c91e | 1793 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1da177e4 LT |
1794 | int err; |
1795 | ||
1796 | if (!capable(CAP_NET_RAW)) | |
1797 | return -EPERM; | |
be02097c DM |
1798 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
1799 | sock->type != SOCK_PACKET) | |
1da177e4 LT |
1800 | return -ESOCKTNOSUPPORT; |
1801 | ||
1802 | sock->state = SS_UNCONNECTED; | |
1803 | ||
1804 | err = -ENOBUFS; | |
6257ff21 | 1805 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto); |
1da177e4 LT |
1806 | if (sk == NULL) |
1807 | goto out; | |
1808 | ||
1809 | sock->ops = &packet_ops; | |
1da177e4 LT |
1810 | if (sock->type == SOCK_PACKET) |
1811 | sock->ops = &packet_ops_spkt; | |
be02097c | 1812 | |
1da177e4 LT |
1813 | sock_init_data(sock, sk); |
1814 | ||
1815 | po = pkt_sk(sk); | |
1816 | sk->sk_family = PF_PACKET; | |
0e11c91e | 1817 | po->num = proto; |
1da177e4 LT |
1818 | |
1819 | sk->sk_destruct = packet_sock_destruct; | |
17ab56a2 | 1820 | sk_refcnt_debug_inc(sk); |
1da177e4 LT |
1821 | |
1822 | /* | |
1823 | * Attach a protocol block | |
1824 | */ | |
1825 | ||
1826 | spin_lock_init(&po->bind_lock); | |
905db440 | 1827 | mutex_init(&po->pg_vec_lock); |
1da177e4 | 1828 | po->prot_hook.func = packet_rcv; |
be02097c | 1829 | |
1da177e4 LT |
1830 | if (sock->type == SOCK_PACKET) |
1831 | po->prot_hook.func = packet_rcv_spkt; | |
be02097c | 1832 | |
1da177e4 LT |
1833 | po->prot_hook.af_packet_priv = sk; |
1834 | ||
0e11c91e AV |
1835 | if (proto) { |
1836 | po->prot_hook.type = proto; | |
ce06b03e | 1837 | register_prot_hook(sk); |
1da177e4 LT |
1838 | } |
1839 | ||
808f5114 | 1840 | spin_lock_bh(&net->packet.sklist_lock); |
1841 | sk_add_node_rcu(sk, &net->packet.sklist); | |
3680453c | 1842 | sock_prot_inuse_add(net, &packet_proto, 1); |
808f5114 | 1843 | spin_unlock_bh(&net->packet.sklist_lock); |
1844 | ||
40d4e3df | 1845 | return 0; |
1da177e4 LT |
1846 | out: |
1847 | return err; | |
1848 | } | |
1849 | ||
ed85b565 RC |
1850 | static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len) |
1851 | { | |
1852 | struct sock_exterr_skb *serr; | |
1853 | struct sk_buff *skb, *skb2; | |
1854 | int copied, err; | |
1855 | ||
1856 | err = -EAGAIN; | |
1857 | skb = skb_dequeue(&sk->sk_error_queue); | |
1858 | if (skb == NULL) | |
1859 | goto out; | |
1860 | ||
1861 | copied = skb->len; | |
1862 | if (copied > len) { | |
1863 | msg->msg_flags |= MSG_TRUNC; | |
1864 | copied = len; | |
1865 | } | |
1866 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1867 | if (err) | |
1868 | goto out_free_skb; | |
1869 | ||
1870 | sock_recv_timestamp(msg, sk, skb); | |
1871 | ||
1872 | serr = SKB_EXT_ERR(skb); | |
1873 | put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP, | |
1874 | sizeof(serr->ee), &serr->ee); | |
1875 | ||
1876 | msg->msg_flags |= MSG_ERRQUEUE; | |
1877 | err = copied; | |
1878 | ||
1879 | /* Reset and regenerate socket error */ | |
1880 | spin_lock_bh(&sk->sk_error_queue.lock); | |
1881 | sk->sk_err = 0; | |
1882 | if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { | |
1883 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; | |
1884 | spin_unlock_bh(&sk->sk_error_queue.lock); | |
1885 | sk->sk_error_report(sk); | |
1886 | } else | |
1887 | spin_unlock_bh(&sk->sk_error_queue.lock); | |
1888 | ||
1889 | out_free_skb: | |
1890 | kfree_skb(skb); | |
1891 | out: | |
1892 | return err; | |
1893 | } | |
1894 | ||
1da177e4 LT |
1895 | /* |
1896 | * Pull a packet from our receive queue and hand it to the user. | |
1897 | * If necessary we block. | |
1898 | */ | |
1899 | ||
1900 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1901 | struct msghdr *msg, size_t len, int flags) | |
1902 | { | |
1903 | struct sock *sk = sock->sk; | |
1904 | struct sk_buff *skb; | |
1905 | int copied, err; | |
0fb375fb | 1906 | struct sockaddr_ll *sll; |
bfd5f4a3 | 1907 | int vnet_hdr_len = 0; |
1da177e4 LT |
1908 | |
1909 | err = -EINVAL; | |
ed85b565 | 1910 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE)) |
1da177e4 LT |
1911 | goto out; |
1912 | ||
1913 | #if 0 | |
1914 | /* What error should we return now? EUNATTACH? */ | |
1915 | if (pkt_sk(sk)->ifindex < 0) | |
1916 | return -ENODEV; | |
1917 | #endif | |
1918 | ||
ed85b565 RC |
1919 | if (flags & MSG_ERRQUEUE) { |
1920 | err = packet_recv_error(sk, msg, len); | |
1921 | goto out; | |
1922 | } | |
1923 | ||
1da177e4 LT |
1924 | /* |
1925 | * Call the generic datagram receiver. This handles all sorts | |
1926 | * of horrible races and re-entrancy so we can forget about it | |
1927 | * in the protocol layers. | |
1928 | * | |
1929 | * Now it will return ENETDOWN, if device have just gone down, | |
1930 | * but then it will block. | |
1931 | */ | |
1932 | ||
40d4e3df | 1933 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
1da177e4 LT |
1934 | |
1935 | /* | |
1ce4f28b | 1936 | * An error occurred so return it. Because skb_recv_datagram() |
1da177e4 LT |
1937 | * handles the blocking we don't see and worry about blocking |
1938 | * retries. | |
1939 | */ | |
1940 | ||
8ae55f04 | 1941 | if (skb == NULL) |
1da177e4 LT |
1942 | goto out; |
1943 | ||
bfd5f4a3 SS |
1944 | if (pkt_sk(sk)->has_vnet_hdr) { |
1945 | struct virtio_net_hdr vnet_hdr = { 0 }; | |
1946 | ||
1947 | err = -EINVAL; | |
1948 | vnet_hdr_len = sizeof(vnet_hdr); | |
1f18b717 | 1949 | if (len < vnet_hdr_len) |
bfd5f4a3 SS |
1950 | goto out_free; |
1951 | ||
1f18b717 MK |
1952 | len -= vnet_hdr_len; |
1953 | ||
bfd5f4a3 SS |
1954 | if (skb_is_gso(skb)) { |
1955 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
1956 | ||
1957 | /* This is a hint as to how much should be linear. */ | |
1958 | vnet_hdr.hdr_len = skb_headlen(skb); | |
1959 | vnet_hdr.gso_size = sinfo->gso_size; | |
1960 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
1961 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
1962 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
1963 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
1964 | else if (sinfo->gso_type & SKB_GSO_UDP) | |
1965 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
1966 | else if (sinfo->gso_type & SKB_GSO_FCOE) | |
1967 | goto out_free; | |
1968 | else | |
1969 | BUG(); | |
1970 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
1971 | vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
1972 | } else | |
1973 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
1974 | ||
1975 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
1976 | vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
55508d60 | 1977 | vnet_hdr.csum_start = skb_checksum_start_offset(skb); |
bfd5f4a3 | 1978 | vnet_hdr.csum_offset = skb->csum_offset; |
10a8d94a JW |
1979 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
1980 | vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
bfd5f4a3 SS |
1981 | } /* else everything is zero */ |
1982 | ||
1983 | err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr, | |
1984 | vnet_hdr_len); | |
1985 | if (err < 0) | |
1986 | goto out_free; | |
1987 | } | |
1988 | ||
0fb375fb EB |
1989 | /* |
1990 | * If the address length field is there to be filled in, we fill | |
1991 | * it in now. | |
1992 | */ | |
1993 | ||
ffbc6111 | 1994 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
0fb375fb EB |
1995 | if (sock->type == SOCK_PACKET) |
1996 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
1997 | else | |
1998 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); | |
1999 | ||
1da177e4 LT |
2000 | /* |
2001 | * You lose any data beyond the buffer you gave. If it worries a | |
2002 | * user program they can ask the device for its MTU anyway. | |
2003 | */ | |
2004 | ||
2005 | copied = skb->len; | |
40d4e3df ED |
2006 | if (copied > len) { |
2007 | copied = len; | |
2008 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 LT |
2009 | } |
2010 | ||
2011 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
2012 | if (err) | |
2013 | goto out_free; | |
2014 | ||
3b885787 | 2015 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
2016 | |
2017 | if (msg->msg_name) | |
ffbc6111 HX |
2018 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
2019 | msg->msg_namelen); | |
1da177e4 | 2020 | |
8dc41944 | 2021 | if (pkt_sk(sk)->auxdata) { |
ffbc6111 HX |
2022 | struct tpacket_auxdata aux; |
2023 | ||
2024 | aux.tp_status = TP_STATUS_USER; | |
2025 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
2026 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; | |
2027 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; | |
2028 | aux.tp_snaplen = skb->len; | |
2029 | aux.tp_mac = 0; | |
bbe735e4 | 2030 | aux.tp_net = skb_network_offset(skb); |
a3bcc23e BG |
2031 | if (vlan_tx_tag_present(skb)) { |
2032 | aux.tp_vlan_tci = vlan_tx_tag_get(skb); | |
2033 | aux.tp_status |= TP_STATUS_VLAN_VALID; | |
2034 | } else { | |
2035 | aux.tp_vlan_tci = 0; | |
2036 | } | |
13fcb7bd | 2037 | aux.tp_padding = 0; |
ffbc6111 | 2038 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); |
8dc41944 HX |
2039 | } |
2040 | ||
1da177e4 LT |
2041 | /* |
2042 | * Free or return the buffer as appropriate. Again this | |
2043 | * hides all the races and re-entrancy issues from us. | |
2044 | */ | |
bfd5f4a3 | 2045 | err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied); |
1da177e4 LT |
2046 | |
2047 | out_free: | |
2048 | skb_free_datagram(sk, skb); | |
2049 | out: | |
2050 | return err; | |
2051 | } | |
2052 | ||
1da177e4 LT |
2053 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
2054 | int *uaddr_len, int peer) | |
2055 | { | |
2056 | struct net_device *dev; | |
2057 | struct sock *sk = sock->sk; | |
2058 | ||
2059 | if (peer) | |
2060 | return -EOPNOTSUPP; | |
2061 | ||
2062 | uaddr->sa_family = AF_PACKET; | |
654d1f8a ED |
2063 | rcu_read_lock(); |
2064 | dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); | |
2065 | if (dev) | |
67286640 | 2066 | strncpy(uaddr->sa_data, dev->name, 14); |
654d1f8a | 2067 | else |
1da177e4 | 2068 | memset(uaddr->sa_data, 0, 14); |
654d1f8a | 2069 | rcu_read_unlock(); |
1da177e4 LT |
2070 | *uaddr_len = sizeof(*uaddr); |
2071 | ||
2072 | return 0; | |
2073 | } | |
1da177e4 LT |
2074 | |
2075 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
2076 | int *uaddr_len, int peer) | |
2077 | { | |
2078 | struct net_device *dev; | |
2079 | struct sock *sk = sock->sk; | |
2080 | struct packet_sock *po = pkt_sk(sk); | |
13cfa97b | 2081 | DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr); |
1da177e4 LT |
2082 | |
2083 | if (peer) | |
2084 | return -EOPNOTSUPP; | |
2085 | ||
2086 | sll->sll_family = AF_PACKET; | |
2087 | sll->sll_ifindex = po->ifindex; | |
2088 | sll->sll_protocol = po->num; | |
67286640 | 2089 | sll->sll_pkttype = 0; |
654d1f8a ED |
2090 | rcu_read_lock(); |
2091 | dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex); | |
1da177e4 LT |
2092 | if (dev) { |
2093 | sll->sll_hatype = dev->type; | |
2094 | sll->sll_halen = dev->addr_len; | |
2095 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1da177e4 LT |
2096 | } else { |
2097 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
2098 | sll->sll_halen = 0; | |
2099 | } | |
654d1f8a | 2100 | rcu_read_unlock(); |
0fb375fb | 2101 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
2102 | |
2103 | return 0; | |
2104 | } | |
2105 | ||
2aeb0b88 WC |
2106 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
2107 | int what) | |
1da177e4 LT |
2108 | { |
2109 | switch (i->type) { | |
2110 | case PACKET_MR_MULTICAST: | |
1162563f JP |
2111 | if (i->alen != dev->addr_len) |
2112 | return -EINVAL; | |
1da177e4 | 2113 | if (what > 0) |
22bedad3 | 2114 | return dev_mc_add(dev, i->addr); |
1da177e4 | 2115 | else |
22bedad3 | 2116 | return dev_mc_del(dev, i->addr); |
1da177e4 LT |
2117 | break; |
2118 | case PACKET_MR_PROMISC: | |
2aeb0b88 | 2119 | return dev_set_promiscuity(dev, what); |
1da177e4 LT |
2120 | break; |
2121 | case PACKET_MR_ALLMULTI: | |
2aeb0b88 | 2122 | return dev_set_allmulti(dev, what); |
1da177e4 | 2123 | break; |
d95ed927 | 2124 | case PACKET_MR_UNICAST: |
1162563f JP |
2125 | if (i->alen != dev->addr_len) |
2126 | return -EINVAL; | |
d95ed927 | 2127 | if (what > 0) |
a748ee24 | 2128 | return dev_uc_add(dev, i->addr); |
d95ed927 | 2129 | else |
a748ee24 | 2130 | return dev_uc_del(dev, i->addr); |
d95ed927 | 2131 | break; |
40d4e3df ED |
2132 | default: |
2133 | break; | |
1da177e4 | 2134 | } |
2aeb0b88 | 2135 | return 0; |
1da177e4 LT |
2136 | } |
2137 | ||
2138 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
2139 | { | |
40d4e3df | 2140 | for ( ; i; i = i->next) { |
1da177e4 LT |
2141 | if (i->ifindex == dev->ifindex) |
2142 | packet_dev_mc(dev, i, what); | |
2143 | } | |
2144 | } | |
2145 | ||
0fb375fb | 2146 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
2147 | { |
2148 | struct packet_sock *po = pkt_sk(sk); | |
2149 | struct packet_mclist *ml, *i; | |
2150 | struct net_device *dev; | |
2151 | int err; | |
2152 | ||
2153 | rtnl_lock(); | |
2154 | ||
2155 | err = -ENODEV; | |
3b1e0a65 | 2156 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
1da177e4 LT |
2157 | if (!dev) |
2158 | goto done; | |
2159 | ||
2160 | err = -EINVAL; | |
1162563f | 2161 | if (mreq->mr_alen > dev->addr_len) |
1da177e4 LT |
2162 | goto done; |
2163 | ||
2164 | err = -ENOBUFS; | |
8b3a7005 | 2165 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
2166 | if (i == NULL) |
2167 | goto done; | |
2168 | ||
2169 | err = 0; | |
2170 | for (ml = po->mclist; ml; ml = ml->next) { | |
2171 | if (ml->ifindex == mreq->mr_ifindex && | |
2172 | ml->type == mreq->mr_type && | |
2173 | ml->alen == mreq->mr_alen && | |
2174 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
2175 | ml->count++; | |
2176 | /* Free the new element ... */ | |
2177 | kfree(i); | |
2178 | goto done; | |
2179 | } | |
2180 | } | |
2181 | ||
2182 | i->type = mreq->mr_type; | |
2183 | i->ifindex = mreq->mr_ifindex; | |
2184 | i->alen = mreq->mr_alen; | |
2185 | memcpy(i->addr, mreq->mr_address, i->alen); | |
2186 | i->count = 1; | |
2187 | i->next = po->mclist; | |
2188 | po->mclist = i; | |
2aeb0b88 WC |
2189 | err = packet_dev_mc(dev, i, 1); |
2190 | if (err) { | |
2191 | po->mclist = i->next; | |
2192 | kfree(i); | |
2193 | } | |
1da177e4 LT |
2194 | |
2195 | done: | |
2196 | rtnl_unlock(); | |
2197 | return err; | |
2198 | } | |
2199 | ||
0fb375fb | 2200 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
2201 | { |
2202 | struct packet_mclist *ml, **mlp; | |
2203 | ||
2204 | rtnl_lock(); | |
2205 | ||
2206 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
2207 | if (ml->ifindex == mreq->mr_ifindex && | |
2208 | ml->type == mreq->mr_type && | |
2209 | ml->alen == mreq->mr_alen && | |
2210 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
2211 | if (--ml->count == 0) { | |
2212 | struct net_device *dev; | |
2213 | *mlp = ml->next; | |
ad959e76 ED |
2214 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
2215 | if (dev) | |
1da177e4 | 2216 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
2217 | kfree(ml); |
2218 | } | |
2219 | rtnl_unlock(); | |
2220 | return 0; | |
2221 | } | |
2222 | } | |
2223 | rtnl_unlock(); | |
2224 | return -EADDRNOTAVAIL; | |
2225 | } | |
2226 | ||
2227 | static void packet_flush_mclist(struct sock *sk) | |
2228 | { | |
2229 | struct packet_sock *po = pkt_sk(sk); | |
2230 | struct packet_mclist *ml; | |
2231 | ||
2232 | if (!po->mclist) | |
2233 | return; | |
2234 | ||
2235 | rtnl_lock(); | |
2236 | while ((ml = po->mclist) != NULL) { | |
2237 | struct net_device *dev; | |
2238 | ||
2239 | po->mclist = ml->next; | |
ad959e76 ED |
2240 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
2241 | if (dev != NULL) | |
1da177e4 | 2242 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
2243 | kfree(ml); |
2244 | } | |
2245 | rtnl_unlock(); | |
2246 | } | |
1da177e4 LT |
2247 | |
2248 | static int | |
b7058842 | 2249 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2250 | { |
2251 | struct sock *sk = sock->sk; | |
8dc41944 | 2252 | struct packet_sock *po = pkt_sk(sk); |
1da177e4 LT |
2253 | int ret; |
2254 | ||
2255 | if (level != SOL_PACKET) | |
2256 | return -ENOPROTOOPT; | |
2257 | ||
69e3c75f | 2258 | switch (optname) { |
1ce4f28b | 2259 | case PACKET_ADD_MEMBERSHIP: |
1da177e4 LT |
2260 | case PACKET_DROP_MEMBERSHIP: |
2261 | { | |
0fb375fb EB |
2262 | struct packet_mreq_max mreq; |
2263 | int len = optlen; | |
2264 | memset(&mreq, 0, sizeof(mreq)); | |
2265 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 2266 | return -EINVAL; |
0fb375fb EB |
2267 | if (len > sizeof(mreq)) |
2268 | len = sizeof(mreq); | |
40d4e3df | 2269 | if (copy_from_user(&mreq, optval, len)) |
1da177e4 | 2270 | return -EFAULT; |
0fb375fb EB |
2271 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
2272 | return -EINVAL; | |
1da177e4 LT |
2273 | if (optname == PACKET_ADD_MEMBERSHIP) |
2274 | ret = packet_mc_add(sk, &mreq); | |
2275 | else | |
2276 | ret = packet_mc_drop(sk, &mreq); | |
2277 | return ret; | |
2278 | } | |
a2efcfa0 | 2279 | |
1da177e4 | 2280 | case PACKET_RX_RING: |
69e3c75f | 2281 | case PACKET_TX_RING: |
1da177e4 LT |
2282 | { |
2283 | struct tpacket_req req; | |
2284 | ||
40d4e3df | 2285 | if (optlen < sizeof(req)) |
1da177e4 | 2286 | return -EINVAL; |
bfd5f4a3 SS |
2287 | if (pkt_sk(sk)->has_vnet_hdr) |
2288 | return -EINVAL; | |
40d4e3df | 2289 | if (copy_from_user(&req, optval, sizeof(req))) |
1da177e4 | 2290 | return -EFAULT; |
69e3c75f | 2291 | return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING); |
1da177e4 LT |
2292 | } |
2293 | case PACKET_COPY_THRESH: | |
2294 | { | |
2295 | int val; | |
2296 | ||
40d4e3df | 2297 | if (optlen != sizeof(val)) |
1da177e4 | 2298 | return -EINVAL; |
40d4e3df | 2299 | if (copy_from_user(&val, optval, sizeof(val))) |
1da177e4 LT |
2300 | return -EFAULT; |
2301 | ||
2302 | pkt_sk(sk)->copy_thresh = val; | |
2303 | return 0; | |
2304 | } | |
bbd6ef87 PM |
2305 | case PACKET_VERSION: |
2306 | { | |
2307 | int val; | |
2308 | ||
2309 | if (optlen != sizeof(val)) | |
2310 | return -EINVAL; | |
69e3c75f | 2311 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
bbd6ef87 PM |
2312 | return -EBUSY; |
2313 | if (copy_from_user(&val, optval, sizeof(val))) | |
2314 | return -EFAULT; | |
2315 | switch (val) { | |
2316 | case TPACKET_V1: | |
2317 | case TPACKET_V2: | |
2318 | po->tp_version = val; | |
2319 | return 0; | |
2320 | default: | |
2321 | return -EINVAL; | |
2322 | } | |
2323 | } | |
8913336a PM |
2324 | case PACKET_RESERVE: |
2325 | { | |
2326 | unsigned int val; | |
2327 | ||
2328 | if (optlen != sizeof(val)) | |
2329 | return -EINVAL; | |
69e3c75f | 2330 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
8913336a PM |
2331 | return -EBUSY; |
2332 | if (copy_from_user(&val, optval, sizeof(val))) | |
2333 | return -EFAULT; | |
2334 | po->tp_reserve = val; | |
2335 | return 0; | |
2336 | } | |
69e3c75f JB |
2337 | case PACKET_LOSS: |
2338 | { | |
2339 | unsigned int val; | |
2340 | ||
2341 | if (optlen != sizeof(val)) | |
2342 | return -EINVAL; | |
2343 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
2344 | return -EBUSY; | |
2345 | if (copy_from_user(&val, optval, sizeof(val))) | |
2346 | return -EFAULT; | |
2347 | po->tp_loss = !!val; | |
2348 | return 0; | |
2349 | } | |
8dc41944 HX |
2350 | case PACKET_AUXDATA: |
2351 | { | |
2352 | int val; | |
2353 | ||
2354 | if (optlen < sizeof(val)) | |
2355 | return -EINVAL; | |
2356 | if (copy_from_user(&val, optval, sizeof(val))) | |
2357 | return -EFAULT; | |
2358 | ||
2359 | po->auxdata = !!val; | |
2360 | return 0; | |
2361 | } | |
80feaacb PWJ |
2362 | case PACKET_ORIGDEV: |
2363 | { | |
2364 | int val; | |
2365 | ||
2366 | if (optlen < sizeof(val)) | |
2367 | return -EINVAL; | |
2368 | if (copy_from_user(&val, optval, sizeof(val))) | |
2369 | return -EFAULT; | |
2370 | ||
2371 | po->origdev = !!val; | |
2372 | return 0; | |
2373 | } | |
bfd5f4a3 SS |
2374 | case PACKET_VNET_HDR: |
2375 | { | |
2376 | int val; | |
2377 | ||
2378 | if (sock->type != SOCK_RAW) | |
2379 | return -EINVAL; | |
2380 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
2381 | return -EBUSY; | |
2382 | if (optlen < sizeof(val)) | |
2383 | return -EINVAL; | |
2384 | if (copy_from_user(&val, optval, sizeof(val))) | |
2385 | return -EFAULT; | |
2386 | ||
2387 | po->has_vnet_hdr = !!val; | |
2388 | return 0; | |
2389 | } | |
614f60fa SM |
2390 | case PACKET_TIMESTAMP: |
2391 | { | |
2392 | int val; | |
2393 | ||
2394 | if (optlen != sizeof(val)) | |
2395 | return -EINVAL; | |
2396 | if (copy_from_user(&val, optval, sizeof(val))) | |
2397 | return -EFAULT; | |
2398 | ||
2399 | po->tp_tstamp = val; | |
2400 | return 0; | |
2401 | } | |
dc99f600 DM |
2402 | case PACKET_FANOUT: |
2403 | { | |
2404 | int val; | |
2405 | ||
2406 | if (optlen != sizeof(val)) | |
2407 | return -EINVAL; | |
2408 | if (copy_from_user(&val, optval, sizeof(val))) | |
2409 | return -EFAULT; | |
2410 | ||
2411 | return fanout_add(sk, val & 0xffff, val >> 16); | |
2412 | } | |
1da177e4 LT |
2413 | default: |
2414 | return -ENOPROTOOPT; | |
2415 | } | |
2416 | } | |
2417 | ||
2418 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
2419 | char __user *optval, int __user *optlen) | |
2420 | { | |
2421 | int len; | |
8dc41944 | 2422 | int val; |
1da177e4 LT |
2423 | struct sock *sk = sock->sk; |
2424 | struct packet_sock *po = pkt_sk(sk); | |
8dc41944 HX |
2425 | void *data; |
2426 | struct tpacket_stats st; | |
1da177e4 LT |
2427 | |
2428 | if (level != SOL_PACKET) | |
2429 | return -ENOPROTOOPT; | |
2430 | ||
8ae55f04 KK |
2431 | if (get_user(len, optlen)) |
2432 | return -EFAULT; | |
1da177e4 LT |
2433 | |
2434 | if (len < 0) | |
2435 | return -EINVAL; | |
1ce4f28b | 2436 | |
69e3c75f | 2437 | switch (optname) { |
1da177e4 | 2438 | case PACKET_STATISTICS: |
1da177e4 LT |
2439 | if (len > sizeof(struct tpacket_stats)) |
2440 | len = sizeof(struct tpacket_stats); | |
2441 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
2442 | st = po->stats; | |
2443 | memset(&po->stats, 0, sizeof(st)); | |
2444 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
2445 | st.tp_packets += st.tp_drops; | |
2446 | ||
8dc41944 HX |
2447 | data = &st; |
2448 | break; | |
2449 | case PACKET_AUXDATA: | |
2450 | if (len > sizeof(int)) | |
2451 | len = sizeof(int); | |
2452 | val = po->auxdata; | |
2453 | ||
80feaacb PWJ |
2454 | data = &val; |
2455 | break; | |
2456 | case PACKET_ORIGDEV: | |
2457 | if (len > sizeof(int)) | |
2458 | len = sizeof(int); | |
2459 | val = po->origdev; | |
2460 | ||
bfd5f4a3 SS |
2461 | data = &val; |
2462 | break; | |
2463 | case PACKET_VNET_HDR: | |
2464 | if (len > sizeof(int)) | |
2465 | len = sizeof(int); | |
2466 | val = po->has_vnet_hdr; | |
2467 | ||
8dc41944 | 2468 | data = &val; |
1da177e4 | 2469 | break; |
bbd6ef87 PM |
2470 | case PACKET_VERSION: |
2471 | if (len > sizeof(int)) | |
2472 | len = sizeof(int); | |
2473 | val = po->tp_version; | |
2474 | data = &val; | |
2475 | break; | |
2476 | case PACKET_HDRLEN: | |
2477 | if (len > sizeof(int)) | |
2478 | len = sizeof(int); | |
2479 | if (copy_from_user(&val, optval, len)) | |
2480 | return -EFAULT; | |
2481 | switch (val) { | |
2482 | case TPACKET_V1: | |
2483 | val = sizeof(struct tpacket_hdr); | |
2484 | break; | |
2485 | case TPACKET_V2: | |
2486 | val = sizeof(struct tpacket2_hdr); | |
2487 | break; | |
2488 | default: | |
2489 | return -EINVAL; | |
2490 | } | |
2491 | data = &val; | |
2492 | break; | |
8913336a PM |
2493 | case PACKET_RESERVE: |
2494 | if (len > sizeof(unsigned int)) | |
2495 | len = sizeof(unsigned int); | |
2496 | val = po->tp_reserve; | |
2497 | data = &val; | |
2498 | break; | |
69e3c75f JB |
2499 | case PACKET_LOSS: |
2500 | if (len > sizeof(unsigned int)) | |
2501 | len = sizeof(unsigned int); | |
2502 | val = po->tp_loss; | |
2503 | data = &val; | |
2504 | break; | |
614f60fa SM |
2505 | case PACKET_TIMESTAMP: |
2506 | if (len > sizeof(int)) | |
2507 | len = sizeof(int); | |
2508 | val = po->tp_tstamp; | |
2509 | data = &val; | |
2510 | break; | |
dc99f600 DM |
2511 | case PACKET_FANOUT: |
2512 | if (len > sizeof(int)) | |
2513 | len = sizeof(int); | |
2514 | val = (po->fanout ? | |
2515 | ((u32)po->fanout->id | | |
2516 | ((u32)po->fanout->type << 16)) : | |
2517 | 0); | |
2518 | data = &val; | |
2519 | break; | |
1da177e4 LT |
2520 | default: |
2521 | return -ENOPROTOOPT; | |
2522 | } | |
2523 | ||
8ae55f04 KK |
2524 | if (put_user(len, optlen)) |
2525 | return -EFAULT; | |
8dc41944 HX |
2526 | if (copy_to_user(optval, data, len)) |
2527 | return -EFAULT; | |
8ae55f04 | 2528 | return 0; |
1da177e4 LT |
2529 | } |
2530 | ||
2531 | ||
2532 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) | |
2533 | { | |
2534 | struct sock *sk; | |
2535 | struct hlist_node *node; | |
ad930650 | 2536 | struct net_device *dev = data; |
c346dca1 | 2537 | struct net *net = dev_net(dev); |
1da177e4 | 2538 | |
808f5114 | 2539 | rcu_read_lock(); |
2540 | sk_for_each_rcu(sk, node, &net->packet.sklist) { | |
1da177e4 LT |
2541 | struct packet_sock *po = pkt_sk(sk); |
2542 | ||
2543 | switch (msg) { | |
2544 | case NETDEV_UNREGISTER: | |
1da177e4 LT |
2545 | if (po->mclist) |
2546 | packet_dev_mclist(dev, po->mclist, -1); | |
a2efcfa0 DM |
2547 | /* fallthrough */ |
2548 | ||
1da177e4 LT |
2549 | case NETDEV_DOWN: |
2550 | if (dev->ifindex == po->ifindex) { | |
2551 | spin_lock(&po->bind_lock); | |
2552 | if (po->running) { | |
ce06b03e | 2553 | __unregister_prot_hook(sk, false); |
1da177e4 LT |
2554 | sk->sk_err = ENETDOWN; |
2555 | if (!sock_flag(sk, SOCK_DEAD)) | |
2556 | sk->sk_error_report(sk); | |
2557 | } | |
2558 | if (msg == NETDEV_UNREGISTER) { | |
2559 | po->ifindex = -1; | |
160ff18a BG |
2560 | if (po->prot_hook.dev) |
2561 | dev_put(po->prot_hook.dev); | |
1da177e4 LT |
2562 | po->prot_hook.dev = NULL; |
2563 | } | |
2564 | spin_unlock(&po->bind_lock); | |
2565 | } | |
2566 | break; | |
2567 | case NETDEV_UP: | |
808f5114 | 2568 | if (dev->ifindex == po->ifindex) { |
2569 | spin_lock(&po->bind_lock); | |
ce06b03e DM |
2570 | if (po->num) |
2571 | register_prot_hook(sk); | |
808f5114 | 2572 | spin_unlock(&po->bind_lock); |
1da177e4 | 2573 | } |
1da177e4 LT |
2574 | break; |
2575 | } | |
2576 | } | |
808f5114 | 2577 | rcu_read_unlock(); |
1da177e4 LT |
2578 | return NOTIFY_DONE; |
2579 | } | |
2580 | ||
2581 | ||
2582 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
2583 | unsigned long arg) | |
2584 | { | |
2585 | struct sock *sk = sock->sk; | |
2586 | ||
69e3c75f | 2587 | switch (cmd) { |
40d4e3df ED |
2588 | case SIOCOUTQ: |
2589 | { | |
2590 | int amount = sk_wmem_alloc_get(sk); | |
31e6d363 | 2591 | |
40d4e3df ED |
2592 | return put_user(amount, (int __user *)arg); |
2593 | } | |
2594 | case SIOCINQ: | |
2595 | { | |
2596 | struct sk_buff *skb; | |
2597 | int amount = 0; | |
2598 | ||
2599 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
2600 | skb = skb_peek(&sk->sk_receive_queue); | |
2601 | if (skb) | |
2602 | amount = skb->len; | |
2603 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
2604 | return put_user(amount, (int __user *)arg); | |
2605 | } | |
2606 | case SIOCGSTAMP: | |
2607 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
2608 | case SIOCGSTAMPNS: | |
2609 | return sock_get_timestampns(sk, (struct timespec __user *)arg); | |
1ce4f28b | 2610 | |
1da177e4 | 2611 | #ifdef CONFIG_INET |
40d4e3df ED |
2612 | case SIOCADDRT: |
2613 | case SIOCDELRT: | |
2614 | case SIOCDARP: | |
2615 | case SIOCGARP: | |
2616 | case SIOCSARP: | |
2617 | case SIOCGIFADDR: | |
2618 | case SIOCSIFADDR: | |
2619 | case SIOCGIFBRDADDR: | |
2620 | case SIOCSIFBRDADDR: | |
2621 | case SIOCGIFNETMASK: | |
2622 | case SIOCSIFNETMASK: | |
2623 | case SIOCGIFDSTADDR: | |
2624 | case SIOCSIFDSTADDR: | |
2625 | case SIOCSIFFLAGS: | |
40d4e3df | 2626 | return inet_dgram_ops.ioctl(sock, cmd, arg); |
1da177e4 LT |
2627 | #endif |
2628 | ||
40d4e3df ED |
2629 | default: |
2630 | return -ENOIOCTLCMD; | |
1da177e4 LT |
2631 | } |
2632 | return 0; | |
2633 | } | |
2634 | ||
40d4e3df | 2635 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
1da177e4 LT |
2636 | poll_table *wait) |
2637 | { | |
2638 | struct sock *sk = sock->sk; | |
2639 | struct packet_sock *po = pkt_sk(sk); | |
2640 | unsigned int mask = datagram_poll(file, sock, wait); | |
2641 | ||
2642 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2643 | if (po->rx_ring.pg_vec) { |
2644 | if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL)) | |
1da177e4 LT |
2645 | mask |= POLLIN | POLLRDNORM; |
2646 | } | |
2647 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2648 | spin_lock_bh(&sk->sk_write_queue.lock); |
2649 | if (po->tx_ring.pg_vec) { | |
2650 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) | |
2651 | mask |= POLLOUT | POLLWRNORM; | |
2652 | } | |
2653 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
1da177e4 LT |
2654 | return mask; |
2655 | } | |
2656 | ||
2657 | ||
2658 | /* Dirty? Well, I still did not learn better way to account | |
2659 | * for user mmaps. | |
2660 | */ | |
2661 | ||
2662 | static void packet_mm_open(struct vm_area_struct *vma) | |
2663 | { | |
2664 | struct file *file = vma->vm_file; | |
40d4e3df | 2665 | struct socket *sock = file->private_data; |
1da177e4 | 2666 | struct sock *sk = sock->sk; |
1ce4f28b | 2667 | |
1da177e4 LT |
2668 | if (sk) |
2669 | atomic_inc(&pkt_sk(sk)->mapped); | |
2670 | } | |
2671 | ||
2672 | static void packet_mm_close(struct vm_area_struct *vma) | |
2673 | { | |
2674 | struct file *file = vma->vm_file; | |
40d4e3df | 2675 | struct socket *sock = file->private_data; |
1da177e4 | 2676 | struct sock *sk = sock->sk; |
1ce4f28b | 2677 | |
1da177e4 LT |
2678 | if (sk) |
2679 | atomic_dec(&pkt_sk(sk)->mapped); | |
2680 | } | |
2681 | ||
f0f37e2f | 2682 | static const struct vm_operations_struct packet_mmap_ops = { |
40d4e3df ED |
2683 | .open = packet_mm_open, |
2684 | .close = packet_mm_close, | |
1da177e4 LT |
2685 | }; |
2686 | ||
0e3125c7 NH |
2687 | static void free_pg_vec(struct pgv *pg_vec, unsigned int order, |
2688 | unsigned int len) | |
1da177e4 LT |
2689 | { |
2690 | int i; | |
2691 | ||
4ebf0ae2 | 2692 | for (i = 0; i < len; i++) { |
0e3125c7 | 2693 | if (likely(pg_vec[i].buffer)) { |
c56b4d90 | 2694 | if (is_vmalloc_addr(pg_vec[i].buffer)) |
0e3125c7 NH |
2695 | vfree(pg_vec[i].buffer); |
2696 | else | |
2697 | free_pages((unsigned long)pg_vec[i].buffer, | |
2698 | order); | |
2699 | pg_vec[i].buffer = NULL; | |
2700 | } | |
1da177e4 LT |
2701 | } |
2702 | kfree(pg_vec); | |
2703 | } | |
2704 | ||
c56b4d90 | 2705 | static inline char *alloc_one_pg_vec_page(unsigned long order) |
4ebf0ae2 | 2706 | { |
0e3125c7 NH |
2707 | char *buffer = NULL; |
2708 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | | |
2709 | __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY; | |
2710 | ||
2711 | buffer = (char *) __get_free_pages(gfp_flags, order); | |
2712 | ||
2713 | if (buffer) | |
2714 | return buffer; | |
2715 | ||
2716 | /* | |
2717 | * __get_free_pages failed, fall back to vmalloc | |
2718 | */ | |
bbce5a59 | 2719 | buffer = vzalloc((1 << order) * PAGE_SIZE); |
719bfeaa | 2720 | |
0e3125c7 NH |
2721 | if (buffer) |
2722 | return buffer; | |
2723 | ||
2724 | /* | |
2725 | * vmalloc failed, lets dig into swap here | |
2726 | */ | |
0e3125c7 NH |
2727 | gfp_flags &= ~__GFP_NORETRY; |
2728 | buffer = (char *)__get_free_pages(gfp_flags, order); | |
2729 | if (buffer) | |
2730 | return buffer; | |
2731 | ||
2732 | /* | |
2733 | * complete and utter failure | |
2734 | */ | |
2735 | return NULL; | |
4ebf0ae2 DM |
2736 | } |
2737 | ||
0e3125c7 | 2738 | static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order) |
4ebf0ae2 DM |
2739 | { |
2740 | unsigned int block_nr = req->tp_block_nr; | |
0e3125c7 | 2741 | struct pgv *pg_vec; |
4ebf0ae2 DM |
2742 | int i; |
2743 | ||
0e3125c7 | 2744 | pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL); |
4ebf0ae2 DM |
2745 | if (unlikely(!pg_vec)) |
2746 | goto out; | |
2747 | ||
2748 | for (i = 0; i < block_nr; i++) { | |
c56b4d90 | 2749 | pg_vec[i].buffer = alloc_one_pg_vec_page(order); |
0e3125c7 | 2750 | if (unlikely(!pg_vec[i].buffer)) |
4ebf0ae2 DM |
2751 | goto out_free_pgvec; |
2752 | } | |
2753 | ||
2754 | out: | |
2755 | return pg_vec; | |
2756 | ||
2757 | out_free_pgvec: | |
2758 | free_pg_vec(pg_vec, order, block_nr); | |
2759 | pg_vec = NULL; | |
2760 | goto out; | |
2761 | } | |
1da177e4 | 2762 | |
69e3c75f JB |
2763 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
2764 | int closing, int tx_ring) | |
1da177e4 | 2765 | { |
0e3125c7 | 2766 | struct pgv *pg_vec = NULL; |
1da177e4 | 2767 | struct packet_sock *po = pkt_sk(sk); |
0e11c91e | 2768 | int was_running, order = 0; |
69e3c75f JB |
2769 | struct packet_ring_buffer *rb; |
2770 | struct sk_buff_head *rb_queue; | |
0e11c91e | 2771 | __be16 num; |
69e3c75f | 2772 | int err; |
1ce4f28b | 2773 | |
69e3c75f JB |
2774 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
2775 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; | |
1da177e4 | 2776 | |
69e3c75f JB |
2777 | err = -EBUSY; |
2778 | if (!closing) { | |
2779 | if (atomic_read(&po->mapped)) | |
2780 | goto out; | |
2781 | if (atomic_read(&rb->pending)) | |
2782 | goto out; | |
2783 | } | |
1da177e4 | 2784 | |
69e3c75f JB |
2785 | if (req->tp_block_nr) { |
2786 | /* Sanity tests and some calculations */ | |
2787 | err = -EBUSY; | |
2788 | if (unlikely(rb->pg_vec)) | |
2789 | goto out; | |
1da177e4 | 2790 | |
bbd6ef87 PM |
2791 | switch (po->tp_version) { |
2792 | case TPACKET_V1: | |
2793 | po->tp_hdrlen = TPACKET_HDRLEN; | |
2794 | break; | |
2795 | case TPACKET_V2: | |
2796 | po->tp_hdrlen = TPACKET2_HDRLEN; | |
2797 | break; | |
2798 | } | |
2799 | ||
69e3c75f | 2800 | err = -EINVAL; |
4ebf0ae2 | 2801 | if (unlikely((int)req->tp_block_size <= 0)) |
69e3c75f | 2802 | goto out; |
4ebf0ae2 | 2803 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
69e3c75f | 2804 | goto out; |
8913336a | 2805 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
69e3c75f JB |
2806 | po->tp_reserve)) |
2807 | goto out; | |
4ebf0ae2 | 2808 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
69e3c75f | 2809 | goto out; |
1da177e4 | 2810 | |
69e3c75f JB |
2811 | rb->frames_per_block = req->tp_block_size/req->tp_frame_size; |
2812 | if (unlikely(rb->frames_per_block <= 0)) | |
2813 | goto out; | |
2814 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != | |
2815 | req->tp_frame_nr)) | |
2816 | goto out; | |
1da177e4 LT |
2817 | |
2818 | err = -ENOMEM; | |
4ebf0ae2 DM |
2819 | order = get_order(req->tp_block_size); |
2820 | pg_vec = alloc_pg_vec(req, order); | |
2821 | if (unlikely(!pg_vec)) | |
1da177e4 | 2822 | goto out; |
69e3c75f JB |
2823 | } |
2824 | /* Done */ | |
2825 | else { | |
2826 | err = -EINVAL; | |
4ebf0ae2 | 2827 | if (unlikely(req->tp_frame_nr)) |
69e3c75f | 2828 | goto out; |
1da177e4 LT |
2829 | } |
2830 | ||
2831 | lock_sock(sk); | |
2832 | ||
2833 | /* Detach socket from network */ | |
2834 | spin_lock(&po->bind_lock); | |
2835 | was_running = po->running; | |
2836 | num = po->num; | |
2837 | if (was_running) { | |
1da177e4 | 2838 | po->num = 0; |
ce06b03e | 2839 | __unregister_prot_hook(sk, false); |
1da177e4 LT |
2840 | } |
2841 | spin_unlock(&po->bind_lock); | |
1ce4f28b | 2842 | |
1da177e4 LT |
2843 | synchronize_net(); |
2844 | ||
2845 | err = -EBUSY; | |
905db440 | 2846 | mutex_lock(&po->pg_vec_lock); |
1da177e4 LT |
2847 | if (closing || atomic_read(&po->mapped) == 0) { |
2848 | err = 0; | |
69e3c75f | 2849 | spin_lock_bh(&rb_queue->lock); |
c053fd96 | 2850 | swap(rb->pg_vec, pg_vec); |
69e3c75f JB |
2851 | rb->frame_max = (req->tp_frame_nr - 1); |
2852 | rb->head = 0; | |
2853 | rb->frame_size = req->tp_frame_size; | |
2854 | spin_unlock_bh(&rb_queue->lock); | |
2855 | ||
c053fd96 CG |
2856 | swap(rb->pg_vec_order, order); |
2857 | swap(rb->pg_vec_len, req->tp_block_nr); | |
69e3c75f JB |
2858 | |
2859 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
2860 | po->prot_hook.func = (po->rx_ring.pg_vec) ? | |
2861 | tpacket_rcv : packet_rcv; | |
2862 | skb_queue_purge(rb_queue); | |
1da177e4 | 2863 | if (atomic_read(&po->mapped)) |
40d4e3df ED |
2864 | pr_err("packet_mmap: vma is busy: %d\n", |
2865 | atomic_read(&po->mapped)); | |
1da177e4 | 2866 | } |
905db440 | 2867 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2868 | |
2869 | spin_lock(&po->bind_lock); | |
ce06b03e | 2870 | if (was_running) { |
1da177e4 | 2871 | po->num = num; |
ce06b03e | 2872 | register_prot_hook(sk); |
1da177e4 LT |
2873 | } |
2874 | spin_unlock(&po->bind_lock); | |
2875 | ||
2876 | release_sock(sk); | |
2877 | ||
1da177e4 LT |
2878 | if (pg_vec) |
2879 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
2880 | out: | |
2881 | return err; | |
2882 | } | |
2883 | ||
69e3c75f JB |
2884 | static int packet_mmap(struct file *file, struct socket *sock, |
2885 | struct vm_area_struct *vma) | |
1da177e4 LT |
2886 | { |
2887 | struct sock *sk = sock->sk; | |
2888 | struct packet_sock *po = pkt_sk(sk); | |
69e3c75f JB |
2889 | unsigned long size, expected_size; |
2890 | struct packet_ring_buffer *rb; | |
1da177e4 LT |
2891 | unsigned long start; |
2892 | int err = -EINVAL; | |
2893 | int i; | |
2894 | ||
2895 | if (vma->vm_pgoff) | |
2896 | return -EINVAL; | |
2897 | ||
905db440 | 2898 | mutex_lock(&po->pg_vec_lock); |
69e3c75f JB |
2899 | |
2900 | expected_size = 0; | |
2901 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { | |
2902 | if (rb->pg_vec) { | |
2903 | expected_size += rb->pg_vec_len | |
2904 | * rb->pg_vec_pages | |
2905 | * PAGE_SIZE; | |
2906 | } | |
2907 | } | |
2908 | ||
2909 | if (expected_size == 0) | |
1da177e4 | 2910 | goto out; |
69e3c75f JB |
2911 | |
2912 | size = vma->vm_end - vma->vm_start; | |
2913 | if (size != expected_size) | |
1da177e4 LT |
2914 | goto out; |
2915 | ||
1da177e4 | 2916 | start = vma->vm_start; |
69e3c75f JB |
2917 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
2918 | if (rb->pg_vec == NULL) | |
2919 | continue; | |
2920 | ||
2921 | for (i = 0; i < rb->pg_vec_len; i++) { | |
0e3125c7 NH |
2922 | struct page *page; |
2923 | void *kaddr = rb->pg_vec[i].buffer; | |
69e3c75f JB |
2924 | int pg_num; |
2925 | ||
c56b4d90 CG |
2926 | for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) { |
2927 | page = pgv_to_page(kaddr); | |
69e3c75f JB |
2928 | err = vm_insert_page(vma, start, page); |
2929 | if (unlikely(err)) | |
2930 | goto out; | |
2931 | start += PAGE_SIZE; | |
0e3125c7 | 2932 | kaddr += PAGE_SIZE; |
69e3c75f | 2933 | } |
4ebf0ae2 | 2934 | } |
1da177e4 | 2935 | } |
69e3c75f | 2936 | |
4ebf0ae2 | 2937 | atomic_inc(&po->mapped); |
1da177e4 LT |
2938 | vma->vm_ops = &packet_mmap_ops; |
2939 | err = 0; | |
2940 | ||
2941 | out: | |
905db440 | 2942 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2943 | return err; |
2944 | } | |
1da177e4 | 2945 | |
90ddc4f0 | 2946 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
2947 | .family = PF_PACKET, |
2948 | .owner = THIS_MODULE, | |
2949 | .release = packet_release, | |
2950 | .bind = packet_bind_spkt, | |
2951 | .connect = sock_no_connect, | |
2952 | .socketpair = sock_no_socketpair, | |
2953 | .accept = sock_no_accept, | |
2954 | .getname = packet_getname_spkt, | |
2955 | .poll = datagram_poll, | |
2956 | .ioctl = packet_ioctl, | |
2957 | .listen = sock_no_listen, | |
2958 | .shutdown = sock_no_shutdown, | |
2959 | .setsockopt = sock_no_setsockopt, | |
2960 | .getsockopt = sock_no_getsockopt, | |
2961 | .sendmsg = packet_sendmsg_spkt, | |
2962 | .recvmsg = packet_recvmsg, | |
2963 | .mmap = sock_no_mmap, | |
2964 | .sendpage = sock_no_sendpage, | |
2965 | }; | |
1da177e4 | 2966 | |
90ddc4f0 | 2967 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
2968 | .family = PF_PACKET, |
2969 | .owner = THIS_MODULE, | |
2970 | .release = packet_release, | |
2971 | .bind = packet_bind, | |
2972 | .connect = sock_no_connect, | |
2973 | .socketpair = sock_no_socketpair, | |
2974 | .accept = sock_no_accept, | |
1ce4f28b | 2975 | .getname = packet_getname, |
1da177e4 LT |
2976 | .poll = packet_poll, |
2977 | .ioctl = packet_ioctl, | |
2978 | .listen = sock_no_listen, | |
2979 | .shutdown = sock_no_shutdown, | |
2980 | .setsockopt = packet_setsockopt, | |
2981 | .getsockopt = packet_getsockopt, | |
2982 | .sendmsg = packet_sendmsg, | |
2983 | .recvmsg = packet_recvmsg, | |
2984 | .mmap = packet_mmap, | |
2985 | .sendpage = sock_no_sendpage, | |
2986 | }; | |
2987 | ||
ec1b4cf7 | 2988 | static const struct net_proto_family packet_family_ops = { |
1da177e4 LT |
2989 | .family = PF_PACKET, |
2990 | .create = packet_create, | |
2991 | .owner = THIS_MODULE, | |
2992 | }; | |
2993 | ||
2994 | static struct notifier_block packet_netdev_notifier = { | |
40d4e3df | 2995 | .notifier_call = packet_notifier, |
1da177e4 LT |
2996 | }; |
2997 | ||
2998 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
2999 | |
3000 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
808f5114 | 3001 | __acquires(RCU) |
1da177e4 | 3002 | { |
e372c414 | 3003 | struct net *net = seq_file_net(seq); |
808f5114 | 3004 | |
3005 | rcu_read_lock(); | |
3006 | return seq_hlist_start_head_rcu(&net->packet.sklist, *pos); | |
1da177e4 LT |
3007 | } |
3008 | ||
3009 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3010 | { | |
1bf40954 | 3011 | struct net *net = seq_file_net(seq); |
808f5114 | 3012 | return seq_hlist_next_rcu(v, &net->packet.sklist, pos); |
1da177e4 LT |
3013 | } |
3014 | ||
3015 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
808f5114 | 3016 | __releases(RCU) |
1da177e4 | 3017 | { |
808f5114 | 3018 | rcu_read_unlock(); |
1da177e4 LT |
3019 | } |
3020 | ||
1ce4f28b | 3021 | static int packet_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
3022 | { |
3023 | if (v == SEQ_START_TOKEN) | |
3024 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
3025 | else { | |
b7ceabd9 | 3026 | struct sock *s = sk_entry(v); |
1da177e4 LT |
3027 | const struct packet_sock *po = pkt_sk(s); |
3028 | ||
3029 | seq_printf(seq, | |
71338aa7 | 3030 | "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", |
1da177e4 LT |
3031 | s, |
3032 | atomic_read(&s->sk_refcnt), | |
3033 | s->sk_type, | |
3034 | ntohs(po->num), | |
3035 | po->ifindex, | |
3036 | po->running, | |
3037 | atomic_read(&s->sk_rmem_alloc), | |
3038 | sock_i_uid(s), | |
40d4e3df | 3039 | sock_i_ino(s)); |
1da177e4 LT |
3040 | } |
3041 | ||
3042 | return 0; | |
3043 | } | |
3044 | ||
56b3d975 | 3045 | static const struct seq_operations packet_seq_ops = { |
1da177e4 LT |
3046 | .start = packet_seq_start, |
3047 | .next = packet_seq_next, | |
3048 | .stop = packet_seq_stop, | |
3049 | .show = packet_seq_show, | |
3050 | }; | |
3051 | ||
3052 | static int packet_seq_open(struct inode *inode, struct file *file) | |
3053 | { | |
e372c414 DL |
3054 | return seq_open_net(inode, file, &packet_seq_ops, |
3055 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
3056 | } |
3057 | ||
da7071d7 | 3058 | static const struct file_operations packet_seq_fops = { |
1da177e4 LT |
3059 | .owner = THIS_MODULE, |
3060 | .open = packet_seq_open, | |
3061 | .read = seq_read, | |
3062 | .llseek = seq_lseek, | |
e372c414 | 3063 | .release = seq_release_net, |
1da177e4 LT |
3064 | }; |
3065 | ||
3066 | #endif | |
3067 | ||
2c8c1e72 | 3068 | static int __net_init packet_net_init(struct net *net) |
d12d01d6 | 3069 | { |
808f5114 | 3070 | spin_lock_init(&net->packet.sklist_lock); |
2aaef4e4 | 3071 | INIT_HLIST_HEAD(&net->packet.sklist); |
d12d01d6 DL |
3072 | |
3073 | if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops)) | |
3074 | return -ENOMEM; | |
3075 | ||
3076 | return 0; | |
3077 | } | |
3078 | ||
2c8c1e72 | 3079 | static void __net_exit packet_net_exit(struct net *net) |
d12d01d6 DL |
3080 | { |
3081 | proc_net_remove(net, "packet"); | |
3082 | } | |
3083 | ||
3084 | static struct pernet_operations packet_net_ops = { | |
3085 | .init = packet_net_init, | |
3086 | .exit = packet_net_exit, | |
3087 | }; | |
3088 | ||
3089 | ||
1da177e4 LT |
3090 | static void __exit packet_exit(void) |
3091 | { | |
1da177e4 | 3092 | unregister_netdevice_notifier(&packet_netdev_notifier); |
d12d01d6 | 3093 | unregister_pernet_subsys(&packet_net_ops); |
1da177e4 LT |
3094 | sock_unregister(PF_PACKET); |
3095 | proto_unregister(&packet_proto); | |
3096 | } | |
3097 | ||
3098 | static int __init packet_init(void) | |
3099 | { | |
3100 | int rc = proto_register(&packet_proto, 0); | |
3101 | ||
3102 | if (rc != 0) | |
3103 | goto out; | |
3104 | ||
3105 | sock_register(&packet_family_ops); | |
d12d01d6 | 3106 | register_pernet_subsys(&packet_net_ops); |
1da177e4 | 3107 | register_netdevice_notifier(&packet_netdev_notifier); |
1da177e4 LT |
3108 | out: |
3109 | return rc; | |
3110 | } | |
3111 | ||
3112 | module_init(packet_init); | |
3113 | module_exit(packet_exit); | |
3114 | MODULE_LICENSE("GPL"); | |
3115 | MODULE_ALIAS_NETPROTO(PF_PACKET); |