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