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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> |
457c4cbc | 63 | #include <net/net_namespace.h> |
1da177e4 LT |
64 | #include <net/ip.h> |
65 | #include <net/protocol.h> | |
66 | #include <linux/skbuff.h> | |
67 | #include <net/sock.h> | |
68 | #include <linux/errno.h> | |
69 | #include <linux/timer.h> | |
70 | #include <asm/system.h> | |
71 | #include <asm/uaccess.h> | |
72 | #include <asm/ioctls.h> | |
73 | #include <asm/page.h> | |
a1f8e7f7 | 74 | #include <asm/cacheflush.h> |
1da177e4 LT |
75 | #include <asm/io.h> |
76 | #include <linux/proc_fs.h> | |
77 | #include <linux/seq_file.h> | |
78 | #include <linux/poll.h> | |
79 | #include <linux/module.h> | |
80 | #include <linux/init.h> | |
905db440 | 81 | #include <linux/mutex.h> |
05423b24 | 82 | #include <linux/if_vlan.h> |
bfd5f4a3 | 83 | #include <linux/virtio_net.h> |
1da177e4 LT |
84 | |
85 | #ifdef CONFIG_INET | |
86 | #include <net/inet_common.h> | |
87 | #endif | |
88 | ||
1da177e4 LT |
89 | /* |
90 | Assumptions: | |
91 | - if device has no dev->hard_header routine, it adds and removes ll header | |
92 | inside itself. In this case ll header is invisible outside of device, | |
93 | but higher levels still should reserve dev->hard_header_len. | |
94 | Some devices are enough clever to reallocate skb, when header | |
95 | will not fit to reserved space (tunnel), another ones are silly | |
96 | (PPP). | |
97 | - packet socket receives packets with pulled ll header, | |
98 | so that SOCK_RAW should push it back. | |
99 | ||
100 | On receive: | |
101 | ----------- | |
102 | ||
103 | Incoming, dev->hard_header!=NULL | |
b0e380b1 ACM |
104 | mac_header -> ll header |
105 | data -> data | |
1da177e4 LT |
106 | |
107 | Outgoing, dev->hard_header!=NULL | |
b0e380b1 ACM |
108 | mac_header -> ll header |
109 | data -> ll header | |
1da177e4 LT |
110 | |
111 | Incoming, dev->hard_header==NULL | |
b0e380b1 ACM |
112 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
113 | header. PPP makes it, that is wrong, because introduce | |
db0c58f9 | 114 | assymetry between rx and tx paths. |
b0e380b1 | 115 | data -> data |
1da177e4 LT |
116 | |
117 | Outgoing, dev->hard_header==NULL | |
b0e380b1 ACM |
118 | mac_header -> data. ll header is still not built! |
119 | data -> data | |
1da177e4 LT |
120 | |
121 | Resume | |
122 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. | |
123 | ||
124 | ||
125 | On transmit: | |
126 | ------------ | |
127 | ||
128 | dev->hard_header != NULL | |
b0e380b1 ACM |
129 | mac_header -> ll header |
130 | data -> ll header | |
1da177e4 LT |
131 | |
132 | dev->hard_header == NULL (ll header is added by device, we cannot control it) | |
b0e380b1 ACM |
133 | mac_header -> data |
134 | data -> data | |
1da177e4 LT |
135 | |
136 | We should set nh.raw on output to correct posistion, | |
137 | packet classifier depends on it. | |
138 | */ | |
139 | ||
1da177e4 LT |
140 | /* Private packet socket structures. */ |
141 | ||
40d4e3df | 142 | struct packet_mclist { |
1da177e4 LT |
143 | struct packet_mclist *next; |
144 | int ifindex; | |
145 | int count; | |
146 | unsigned short type; | |
147 | unsigned short alen; | |
0fb375fb EB |
148 | unsigned char addr[MAX_ADDR_LEN]; |
149 | }; | |
150 | /* identical to struct packet_mreq except it has | |
151 | * a longer address field. | |
152 | */ | |
40d4e3df | 153 | struct packet_mreq_max { |
0fb375fb EB |
154 | int mr_ifindex; |
155 | unsigned short mr_type; | |
156 | unsigned short mr_alen; | |
157 | unsigned char mr_address[MAX_ADDR_LEN]; | |
1da177e4 | 158 | }; |
a2efcfa0 | 159 | |
1da177e4 | 160 | #ifdef CONFIG_PACKET_MMAP |
69e3c75f JB |
161 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
162 | int closing, int tx_ring); | |
163 | ||
164 | struct packet_ring_buffer { | |
40d4e3df | 165 | char **pg_vec; |
69e3c75f JB |
166 | unsigned int head; |
167 | unsigned int frames_per_block; | |
168 | unsigned int frame_size; | |
169 | unsigned int frame_max; | |
170 | ||
171 | unsigned int pg_vec_order; | |
172 | unsigned int pg_vec_pages; | |
173 | unsigned int pg_vec_len; | |
174 | ||
175 | atomic_t pending; | |
176 | }; | |
177 | ||
178 | struct packet_sock; | |
179 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg); | |
1da177e4 LT |
180 | #endif |
181 | ||
182 | static void packet_flush_mclist(struct sock *sk); | |
183 | ||
184 | struct packet_sock { | |
185 | /* struct sock has to be the first member of packet_sock */ | |
186 | struct sock sk; | |
187 | struct tpacket_stats stats; | |
188 | #ifdef CONFIG_PACKET_MMAP | |
69e3c75f JB |
189 | struct packet_ring_buffer rx_ring; |
190 | struct packet_ring_buffer tx_ring; | |
1da177e4 LT |
191 | int copy_thresh; |
192 | #endif | |
1da177e4 | 193 | spinlock_t bind_lock; |
905db440 | 194 | struct mutex pg_vec_lock; |
8dc41944 | 195 | unsigned int running:1, /* prot_hook is attached*/ |
80feaacb | 196 | auxdata:1, |
bfd5f4a3 SS |
197 | origdev:1, |
198 | has_vnet_hdr:1; | |
1da177e4 | 199 | int ifindex; /* bound device */ |
0e11c91e | 200 | __be16 num; |
1da177e4 | 201 | struct packet_mclist *mclist; |
1da177e4 LT |
202 | #ifdef CONFIG_PACKET_MMAP |
203 | atomic_t mapped; | |
bbd6ef87 PM |
204 | enum tpacket_versions tp_version; |
205 | unsigned int tp_hdrlen; | |
8913336a | 206 | unsigned int tp_reserve; |
69e3c75f | 207 | unsigned int tp_loss:1; |
1da177e4 | 208 | #endif |
94b05952 | 209 | struct packet_type prot_hook ____cacheline_aligned_in_smp; |
1da177e4 LT |
210 | }; |
211 | ||
ffbc6111 HX |
212 | struct packet_skb_cb { |
213 | unsigned int origlen; | |
214 | union { | |
215 | struct sockaddr_pkt pkt; | |
216 | struct sockaddr_ll ll; | |
217 | } sa; | |
218 | }; | |
219 | ||
220 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) | |
8dc41944 | 221 | |
1da177e4 LT |
222 | #ifdef CONFIG_PACKET_MMAP |
223 | ||
69e3c75f | 224 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
1da177e4 | 225 | { |
bbd6ef87 PM |
226 | union { |
227 | struct tpacket_hdr *h1; | |
228 | struct tpacket2_hdr *h2; | |
229 | void *raw; | |
230 | } h; | |
1da177e4 | 231 | |
69e3c75f | 232 | h.raw = frame; |
bbd6ef87 PM |
233 | switch (po->tp_version) { |
234 | case TPACKET_V1: | |
69e3c75f JB |
235 | h.h1->tp_status = status; |
236 | flush_dcache_page(virt_to_page(&h.h1->tp_status)); | |
bbd6ef87 PM |
237 | break; |
238 | case TPACKET_V2: | |
69e3c75f JB |
239 | h.h2->tp_status = status; |
240 | flush_dcache_page(virt_to_page(&h.h2->tp_status)); | |
bbd6ef87 | 241 | break; |
69e3c75f | 242 | default: |
40d4e3df | 243 | pr_err("TPACKET version not supported\n"); |
69e3c75f | 244 | BUG(); |
bbd6ef87 | 245 | } |
69e3c75f JB |
246 | |
247 | smp_wmb(); | |
bbd6ef87 PM |
248 | } |
249 | ||
69e3c75f | 250 | static int __packet_get_status(struct packet_sock *po, void *frame) |
bbd6ef87 PM |
251 | { |
252 | union { | |
253 | struct tpacket_hdr *h1; | |
254 | struct tpacket2_hdr *h2; | |
255 | void *raw; | |
256 | } h; | |
257 | ||
69e3c75f JB |
258 | smp_rmb(); |
259 | ||
bbd6ef87 PM |
260 | h.raw = frame; |
261 | switch (po->tp_version) { | |
262 | case TPACKET_V1: | |
69e3c75f JB |
263 | flush_dcache_page(virt_to_page(&h.h1->tp_status)); |
264 | return h.h1->tp_status; | |
bbd6ef87 | 265 | case TPACKET_V2: |
69e3c75f JB |
266 | flush_dcache_page(virt_to_page(&h.h2->tp_status)); |
267 | return h.h2->tp_status; | |
268 | default: | |
40d4e3df | 269 | pr_err("TPACKET version not supported\n"); |
69e3c75f JB |
270 | BUG(); |
271 | return 0; | |
bbd6ef87 | 272 | } |
1da177e4 | 273 | } |
69e3c75f JB |
274 | |
275 | static void *packet_lookup_frame(struct packet_sock *po, | |
276 | struct packet_ring_buffer *rb, | |
277 | unsigned int position, | |
278 | int status) | |
279 | { | |
280 | unsigned int pg_vec_pos, frame_offset; | |
281 | union { | |
282 | struct tpacket_hdr *h1; | |
283 | struct tpacket2_hdr *h2; | |
284 | void *raw; | |
285 | } h; | |
286 | ||
287 | pg_vec_pos = position / rb->frames_per_block; | |
288 | frame_offset = position % rb->frames_per_block; | |
289 | ||
290 | h.raw = rb->pg_vec[pg_vec_pos] + (frame_offset * rb->frame_size); | |
291 | ||
292 | if (status != __packet_get_status(po, h.raw)) | |
293 | return NULL; | |
294 | ||
295 | return h.raw; | |
296 | } | |
297 | ||
298 | static inline void *packet_current_frame(struct packet_sock *po, | |
299 | struct packet_ring_buffer *rb, | |
300 | int status) | |
301 | { | |
302 | return packet_lookup_frame(po, rb, rb->head, status); | |
303 | } | |
304 | ||
305 | static inline void *packet_previous_frame(struct packet_sock *po, | |
306 | struct packet_ring_buffer *rb, | |
307 | int status) | |
308 | { | |
309 | unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; | |
310 | return packet_lookup_frame(po, rb, previous, status); | |
311 | } | |
312 | ||
313 | static inline void packet_increment_head(struct packet_ring_buffer *buff) | |
314 | { | |
315 | buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; | |
316 | } | |
317 | ||
1da177e4 LT |
318 | #endif |
319 | ||
320 | static inline struct packet_sock *pkt_sk(struct sock *sk) | |
321 | { | |
322 | return (struct packet_sock *)sk; | |
323 | } | |
324 | ||
325 | static void packet_sock_destruct(struct sock *sk) | |
326 | { | |
547b792c IJ |
327 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
328 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); | |
1da177e4 LT |
329 | |
330 | if (!sock_flag(sk, SOCK_DEAD)) { | |
40d4e3df | 331 | pr_err("Attempt to release alive packet socket: %p\n", sk); |
1da177e4 LT |
332 | return; |
333 | } | |
334 | ||
17ab56a2 | 335 | sk_refcnt_debug_dec(sk); |
1da177e4 LT |
336 | } |
337 | ||
338 | ||
90ddc4f0 | 339 | static const struct proto_ops packet_ops; |
1da177e4 | 340 | |
90ddc4f0 | 341 | static const struct proto_ops packet_ops_spkt; |
1da177e4 | 342 | |
40d4e3df ED |
343 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
344 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
345 | { |
346 | struct sock *sk; | |
347 | struct sockaddr_pkt *spkt; | |
348 | ||
349 | /* | |
350 | * When we registered the protocol we saved the socket in the data | |
351 | * field for just this event. | |
352 | */ | |
353 | ||
354 | sk = pt->af_packet_priv; | |
1ce4f28b | 355 | |
1da177e4 LT |
356 | /* |
357 | * Yank back the headers [hope the device set this | |
358 | * right or kerboom...] | |
359 | * | |
360 | * Incoming packets have ll header pulled, | |
361 | * push it back. | |
362 | * | |
98e399f8 | 363 | * For outgoing ones skb->data == skb_mac_header(skb) |
1da177e4 LT |
364 | * so that this procedure is noop. |
365 | */ | |
366 | ||
367 | if (skb->pkt_type == PACKET_LOOPBACK) | |
368 | goto out; | |
369 | ||
09ad9bc7 | 370 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
371 | goto out; |
372 | ||
40d4e3df ED |
373 | skb = skb_share_check(skb, GFP_ATOMIC); |
374 | if (skb == NULL) | |
1da177e4 LT |
375 | goto oom; |
376 | ||
377 | /* drop any routing info */ | |
adf30907 | 378 | skb_dst_drop(skb); |
1da177e4 | 379 | |
84531c24 PO |
380 | /* drop conntrack reference */ |
381 | nf_reset(skb); | |
382 | ||
ffbc6111 | 383 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
1da177e4 | 384 | |
98e399f8 | 385 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
386 | |
387 | /* | |
388 | * The SOCK_PACKET socket receives _all_ frames. | |
389 | */ | |
390 | ||
391 | spkt->spkt_family = dev->type; | |
392 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
393 | spkt->spkt_protocol = skb->protocol; | |
394 | ||
395 | /* | |
396 | * Charge the memory to the socket. This is done specifically | |
397 | * to prevent sockets using all the memory up. | |
398 | */ | |
399 | ||
40d4e3df | 400 | if (sock_queue_rcv_skb(sk, skb) == 0) |
1da177e4 LT |
401 | return 0; |
402 | ||
403 | out: | |
404 | kfree_skb(skb); | |
405 | oom: | |
406 | return 0; | |
407 | } | |
408 | ||
409 | ||
410 | /* | |
411 | * Output a raw packet to a device layer. This bypasses all the other | |
412 | * protocol layers and you must therefore supply it with a complete frame | |
413 | */ | |
1ce4f28b | 414 | |
1da177e4 LT |
415 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, |
416 | struct msghdr *msg, size_t len) | |
417 | { | |
418 | struct sock *sk = sock->sk; | |
40d4e3df | 419 | struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name; |
1a35ca80 | 420 | struct sk_buff *skb = NULL; |
1da177e4 | 421 | struct net_device *dev; |
40d4e3df | 422 | __be16 proto = 0; |
1da177e4 | 423 | int err; |
1ce4f28b | 424 | |
1da177e4 | 425 | /* |
1ce4f28b | 426 | * Get and verify the address. |
1da177e4 LT |
427 | */ |
428 | ||
40d4e3df | 429 | if (saddr) { |
1da177e4 | 430 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
40d4e3df ED |
431 | return -EINVAL; |
432 | if (msg->msg_namelen == sizeof(struct sockaddr_pkt)) | |
433 | proto = saddr->spkt_protocol; | |
434 | } else | |
435 | return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */ | |
1da177e4 LT |
436 | |
437 | /* | |
1ce4f28b | 438 | * Find the device first to size check it |
1da177e4 LT |
439 | */ |
440 | ||
441 | saddr->spkt_device[13] = 0; | |
1a35ca80 | 442 | retry: |
654d1f8a ED |
443 | rcu_read_lock(); |
444 | dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); | |
1da177e4 LT |
445 | err = -ENODEV; |
446 | if (dev == NULL) | |
447 | goto out_unlock; | |
1ce4f28b | 448 | |
d5e76b0a DM |
449 | err = -ENETDOWN; |
450 | if (!(dev->flags & IFF_UP)) | |
451 | goto out_unlock; | |
452 | ||
1da177e4 | 453 | /* |
40d4e3df ED |
454 | * You may not queue a frame bigger than the mtu. This is the lowest level |
455 | * raw protocol and you must do your own fragmentation at this level. | |
1da177e4 | 456 | */ |
1ce4f28b | 457 | |
1da177e4 | 458 | err = -EMSGSIZE; |
8ae55f04 | 459 | if (len > dev->mtu + dev->hard_header_len) |
1da177e4 LT |
460 | goto out_unlock; |
461 | ||
1a35ca80 ED |
462 | if (!skb) { |
463 | size_t reserved = LL_RESERVED_SPACE(dev); | |
464 | unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0; | |
465 | ||
466 | rcu_read_unlock(); | |
467 | skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL); | |
468 | if (skb == NULL) | |
469 | return -ENOBUFS; | |
470 | /* FIXME: Save some space for broken drivers that write a hard | |
471 | * header at transmission time by themselves. PPP is the notable | |
472 | * one here. This should really be fixed at the driver level. | |
473 | */ | |
474 | skb_reserve(skb, reserved); | |
475 | skb_reset_network_header(skb); | |
476 | ||
477 | /* Try to align data part correctly */ | |
478 | if (hhlen) { | |
479 | skb->data -= hhlen; | |
480 | skb->tail -= hhlen; | |
481 | if (len < hhlen) | |
482 | skb_reset_network_header(skb); | |
483 | } | |
484 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
485 | if (err) | |
486 | goto out_free; | |
487 | goto retry; | |
1da177e4 LT |
488 | } |
489 | ||
1a35ca80 | 490 | |
1da177e4 LT |
491 | skb->protocol = proto; |
492 | skb->dev = dev; | |
493 | skb->priority = sk->sk_priority; | |
2d37a186 | 494 | skb->mark = sk->sk_mark; |
1da177e4 LT |
495 | |
496 | dev_queue_xmit(skb); | |
654d1f8a | 497 | rcu_read_unlock(); |
40d4e3df | 498 | return len; |
1da177e4 | 499 | |
1da177e4 | 500 | out_unlock: |
654d1f8a | 501 | rcu_read_unlock(); |
1a35ca80 ED |
502 | out_free: |
503 | kfree_skb(skb); | |
1da177e4 LT |
504 | return err; |
505 | } | |
1da177e4 | 506 | |
dbcb5855 DM |
507 | static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk, |
508 | unsigned int res) | |
1da177e4 LT |
509 | { |
510 | struct sk_filter *filter; | |
fda9ef5d DM |
511 | |
512 | rcu_read_lock_bh(); | |
513 | filter = rcu_dereference(sk->sk_filter); | |
dbcb5855 DM |
514 | if (filter != NULL) |
515 | res = sk_run_filter(skb, filter->insns, filter->len); | |
fda9ef5d | 516 | rcu_read_unlock_bh(); |
1da177e4 | 517 | |
dbcb5855 | 518 | return res; |
1da177e4 LT |
519 | } |
520 | ||
521 | /* | |
522 | This function makes lazy skb cloning in hope that most of packets | |
523 | are discarded by BPF. | |
524 | ||
525 | Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
526 | and skb->cb are mangled. It works because (and until) packets | |
527 | falling here are owned by current CPU. Output packets are cloned | |
528 | by dev_queue_xmit_nit(), input packets are processed by net_bh | |
529 | sequencially, so that if we return skb to original state on exit, | |
530 | we will not harm anyone. | |
531 | */ | |
532 | ||
40d4e3df ED |
533 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
534 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
535 | { |
536 | struct sock *sk; | |
537 | struct sockaddr_ll *sll; | |
538 | struct packet_sock *po; | |
40d4e3df | 539 | u8 *skb_head = skb->data; |
1da177e4 | 540 | int skb_len = skb->len; |
dbcb5855 | 541 | unsigned int snaplen, res; |
1da177e4 LT |
542 | |
543 | if (skb->pkt_type == PACKET_LOOPBACK) | |
544 | goto drop; | |
545 | ||
546 | sk = pt->af_packet_priv; | |
547 | po = pkt_sk(sk); | |
548 | ||
09ad9bc7 | 549 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
550 | goto drop; |
551 | ||
1da177e4 LT |
552 | skb->dev = dev; |
553 | ||
3b04ddde | 554 | if (dev->header_ops) { |
1da177e4 LT |
555 | /* The device has an explicit notion of ll header, |
556 | exported to higher levels. | |
557 | ||
558 | Otherwise, the device hides datails of it frame | |
559 | structure, so that corresponding packet head | |
560 | never delivered to user. | |
561 | */ | |
562 | if (sk->sk_type != SOCK_DGRAM) | |
98e399f8 | 563 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
564 | else if (skb->pkt_type == PACKET_OUTGOING) { |
565 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 566 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
567 | } |
568 | } | |
569 | ||
570 | snaplen = skb->len; | |
571 | ||
dbcb5855 DM |
572 | res = run_filter(skb, sk, snaplen); |
573 | if (!res) | |
fda9ef5d | 574 | goto drop_n_restore; |
dbcb5855 DM |
575 | if (snaplen > res) |
576 | snaplen = res; | |
1da177e4 LT |
577 | |
578 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
579 | (unsigned)sk->sk_rcvbuf) | |
580 | goto drop_n_acct; | |
581 | ||
582 | if (skb_shared(skb)) { | |
583 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
584 | if (nskb == NULL) | |
585 | goto drop_n_acct; | |
586 | ||
587 | if (skb_head != skb->data) { | |
588 | skb->data = skb_head; | |
589 | skb->len = skb_len; | |
590 | } | |
591 | kfree_skb(skb); | |
592 | skb = nskb; | |
593 | } | |
594 | ||
ffbc6111 HX |
595 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
596 | sizeof(skb->cb)); | |
597 | ||
598 | sll = &PACKET_SKB_CB(skb)->sa.ll; | |
1da177e4 LT |
599 | sll->sll_family = AF_PACKET; |
600 | sll->sll_hatype = dev->type; | |
601 | sll->sll_protocol = skb->protocol; | |
602 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 603 | if (unlikely(po->origdev)) |
80feaacb PWJ |
604 | sll->sll_ifindex = orig_dev->ifindex; |
605 | else | |
606 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 607 | |
b95cce35 | 608 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 | 609 | |
ffbc6111 | 610 | PACKET_SKB_CB(skb)->origlen = skb->len; |
8dc41944 | 611 | |
1da177e4 LT |
612 | if (pskb_trim(skb, snaplen)) |
613 | goto drop_n_acct; | |
614 | ||
615 | skb_set_owner_r(skb, sk); | |
616 | skb->dev = NULL; | |
adf30907 | 617 | skb_dst_drop(skb); |
1da177e4 | 618 | |
84531c24 PO |
619 | /* drop conntrack reference */ |
620 | nf_reset(skb); | |
621 | ||
1da177e4 LT |
622 | spin_lock(&sk->sk_receive_queue.lock); |
623 | po->stats.tp_packets++; | |
3b885787 | 624 | skb->dropcount = atomic_read(&sk->sk_drops); |
1da177e4 LT |
625 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
626 | spin_unlock(&sk->sk_receive_queue.lock); | |
627 | sk->sk_data_ready(sk, skb->len); | |
628 | return 0; | |
629 | ||
630 | drop_n_acct: | |
3b885787 | 631 | po->stats.tp_drops = atomic_inc_return(&sk->sk_drops); |
1da177e4 LT |
632 | |
633 | drop_n_restore: | |
634 | if (skb_head != skb->data && skb_shared(skb)) { | |
635 | skb->data = skb_head; | |
636 | skb->len = skb_len; | |
637 | } | |
638 | drop: | |
ead2ceb0 | 639 | consume_skb(skb); |
1da177e4 LT |
640 | return 0; |
641 | } | |
642 | ||
643 | #ifdef CONFIG_PACKET_MMAP | |
40d4e3df ED |
644 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
645 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
646 | { |
647 | struct sock *sk; | |
648 | struct packet_sock *po; | |
649 | struct sockaddr_ll *sll; | |
bbd6ef87 PM |
650 | union { |
651 | struct tpacket_hdr *h1; | |
652 | struct tpacket2_hdr *h2; | |
653 | void *raw; | |
654 | } h; | |
40d4e3df | 655 | u8 *skb_head = skb->data; |
1da177e4 | 656 | int skb_len = skb->len; |
dbcb5855 | 657 | unsigned int snaplen, res; |
1da177e4 | 658 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
bbd6ef87 | 659 | unsigned short macoff, netoff, hdrlen; |
1da177e4 | 660 | struct sk_buff *copy_skb = NULL; |
b7aa0bf7 | 661 | struct timeval tv; |
bbd6ef87 | 662 | struct timespec ts; |
1da177e4 LT |
663 | |
664 | if (skb->pkt_type == PACKET_LOOPBACK) | |
665 | goto drop; | |
666 | ||
667 | sk = pt->af_packet_priv; | |
668 | po = pkt_sk(sk); | |
669 | ||
09ad9bc7 | 670 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
671 | goto drop; |
672 | ||
3b04ddde | 673 | if (dev->header_ops) { |
1da177e4 | 674 | if (sk->sk_type != SOCK_DGRAM) |
98e399f8 | 675 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
676 | else if (skb->pkt_type == PACKET_OUTGOING) { |
677 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 678 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
679 | } |
680 | } | |
681 | ||
8dc41944 HX |
682 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
683 | status |= TP_STATUS_CSUMNOTREADY; | |
684 | ||
1da177e4 LT |
685 | snaplen = skb->len; |
686 | ||
dbcb5855 DM |
687 | res = run_filter(skb, sk, snaplen); |
688 | if (!res) | |
fda9ef5d | 689 | goto drop_n_restore; |
dbcb5855 DM |
690 | if (snaplen > res) |
691 | snaplen = res; | |
1da177e4 LT |
692 | |
693 | if (sk->sk_type == SOCK_DGRAM) { | |
8913336a PM |
694 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
695 | po->tp_reserve; | |
1da177e4 | 696 | } else { |
bbe735e4 | 697 | unsigned maclen = skb_network_offset(skb); |
bbd6ef87 | 698 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
8913336a PM |
699 | (maclen < 16 ? 16 : maclen)) + |
700 | po->tp_reserve; | |
1da177e4 LT |
701 | macoff = netoff - maclen; |
702 | } | |
703 | ||
69e3c75f | 704 | if (macoff + snaplen > po->rx_ring.frame_size) { |
1da177e4 LT |
705 | if (po->copy_thresh && |
706 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < | |
707 | (unsigned)sk->sk_rcvbuf) { | |
708 | if (skb_shared(skb)) { | |
709 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
710 | } else { | |
711 | copy_skb = skb_get(skb); | |
712 | skb_head = skb->data; | |
713 | } | |
714 | if (copy_skb) | |
715 | skb_set_owner_r(copy_skb, sk); | |
716 | } | |
69e3c75f | 717 | snaplen = po->rx_ring.frame_size - macoff; |
1da177e4 LT |
718 | if ((int)snaplen < 0) |
719 | snaplen = 0; | |
720 | } | |
1da177e4 LT |
721 | |
722 | spin_lock(&sk->sk_receive_queue.lock); | |
69e3c75f | 723 | h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL); |
bbd6ef87 | 724 | if (!h.raw) |
1da177e4 | 725 | goto ring_is_full; |
69e3c75f | 726 | packet_increment_head(&po->rx_ring); |
1da177e4 LT |
727 | po->stats.tp_packets++; |
728 | if (copy_skb) { | |
729 | status |= TP_STATUS_COPY; | |
730 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
731 | } | |
732 | if (!po->stats.tp_drops) | |
733 | status &= ~TP_STATUS_LOSING; | |
734 | spin_unlock(&sk->sk_receive_queue.lock); | |
735 | ||
bbd6ef87 | 736 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
1da177e4 | 737 | |
bbd6ef87 PM |
738 | switch (po->tp_version) { |
739 | case TPACKET_V1: | |
740 | h.h1->tp_len = skb->len; | |
741 | h.h1->tp_snaplen = snaplen; | |
742 | h.h1->tp_mac = macoff; | |
743 | h.h1->tp_net = netoff; | |
744 | if (skb->tstamp.tv64) | |
745 | tv = ktime_to_timeval(skb->tstamp); | |
746 | else | |
747 | do_gettimeofday(&tv); | |
748 | h.h1->tp_sec = tv.tv_sec; | |
749 | h.h1->tp_usec = tv.tv_usec; | |
750 | hdrlen = sizeof(*h.h1); | |
751 | break; | |
752 | case TPACKET_V2: | |
753 | h.h2->tp_len = skb->len; | |
754 | h.h2->tp_snaplen = snaplen; | |
755 | h.h2->tp_mac = macoff; | |
756 | h.h2->tp_net = netoff; | |
757 | if (skb->tstamp.tv64) | |
758 | ts = ktime_to_timespec(skb->tstamp); | |
759 | else | |
760 | getnstimeofday(&ts); | |
761 | h.h2->tp_sec = ts.tv_sec; | |
762 | h.h2->tp_nsec = ts.tv_nsec; | |
05423b24 | 763 | h.h2->tp_vlan_tci = vlan_tx_tag_get(skb); |
bbd6ef87 PM |
764 | hdrlen = sizeof(*h.h2); |
765 | break; | |
766 | default: | |
767 | BUG(); | |
768 | } | |
1da177e4 | 769 | |
bbd6ef87 | 770 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
b95cce35 | 771 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 LT |
772 | sll->sll_family = AF_PACKET; |
773 | sll->sll_hatype = dev->type; | |
774 | sll->sll_protocol = skb->protocol; | |
775 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 776 | if (unlikely(po->origdev)) |
80feaacb PWJ |
777 | sll->sll_ifindex = orig_dev->ifindex; |
778 | else | |
779 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 780 | |
bbd6ef87 | 781 | __packet_set_status(po, h.raw, status); |
e16aa207 | 782 | smp_mb(); |
1da177e4 LT |
783 | { |
784 | struct page *p_start, *p_end; | |
bbd6ef87 | 785 | u8 *h_end = h.raw + macoff + snaplen - 1; |
1da177e4 | 786 | |
bbd6ef87 | 787 | p_start = virt_to_page(h.raw); |
1da177e4 LT |
788 | p_end = virt_to_page(h_end); |
789 | while (p_start <= p_end) { | |
790 | flush_dcache_page(p_start); | |
791 | p_start++; | |
792 | } | |
793 | } | |
794 | ||
795 | sk->sk_data_ready(sk, 0); | |
796 | ||
797 | drop_n_restore: | |
798 | if (skb_head != skb->data && skb_shared(skb)) { | |
799 | skb->data = skb_head; | |
800 | skb->len = skb_len; | |
801 | } | |
802 | drop: | |
1ce4f28b | 803 | kfree_skb(skb); |
1da177e4 LT |
804 | return 0; |
805 | ||
806 | ring_is_full: | |
807 | po->stats.tp_drops++; | |
808 | spin_unlock(&sk->sk_receive_queue.lock); | |
809 | ||
810 | sk->sk_data_ready(sk, 0); | |
acb5d75b | 811 | kfree_skb(copy_skb); |
1da177e4 LT |
812 | goto drop_n_restore; |
813 | } | |
814 | ||
69e3c75f JB |
815 | static void tpacket_destruct_skb(struct sk_buff *skb) |
816 | { | |
817 | struct packet_sock *po = pkt_sk(skb->sk); | |
40d4e3df | 818 | void *ph; |
1da177e4 | 819 | |
69e3c75f | 820 | BUG_ON(skb == NULL); |
1da177e4 | 821 | |
69e3c75f JB |
822 | if (likely(po->tx_ring.pg_vec)) { |
823 | ph = skb_shinfo(skb)->destructor_arg; | |
824 | BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING); | |
825 | BUG_ON(atomic_read(&po->tx_ring.pending) == 0); | |
826 | atomic_dec(&po->tx_ring.pending); | |
827 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE); | |
828 | } | |
829 | ||
830 | sock_wfree(skb); | |
831 | } | |
832 | ||
40d4e3df ED |
833 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
834 | void *frame, struct net_device *dev, int size_max, | |
835 | __be16 proto, unsigned char *addr) | |
69e3c75f JB |
836 | { |
837 | union { | |
838 | struct tpacket_hdr *h1; | |
839 | struct tpacket2_hdr *h2; | |
840 | void *raw; | |
841 | } ph; | |
842 | int to_write, offset, len, tp_len, nr_frags, len_max; | |
843 | struct socket *sock = po->sk.sk_socket; | |
844 | struct page *page; | |
845 | void *data; | |
846 | int err; | |
847 | ||
848 | ph.raw = frame; | |
849 | ||
850 | skb->protocol = proto; | |
851 | skb->dev = dev; | |
852 | skb->priority = po->sk.sk_priority; | |
2d37a186 | 853 | skb->mark = po->sk.sk_mark; |
69e3c75f JB |
854 | skb_shinfo(skb)->destructor_arg = ph.raw; |
855 | ||
856 | switch (po->tp_version) { | |
857 | case TPACKET_V2: | |
858 | tp_len = ph.h2->tp_len; | |
859 | break; | |
860 | default: | |
861 | tp_len = ph.h1->tp_len; | |
862 | break; | |
863 | } | |
864 | if (unlikely(tp_len > size_max)) { | |
40d4e3df | 865 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); |
69e3c75f JB |
866 | return -EMSGSIZE; |
867 | } | |
868 | ||
869 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
870 | skb_reset_network_header(skb); | |
871 | ||
872 | data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll); | |
873 | to_write = tp_len; | |
874 | ||
875 | if (sock->type == SOCK_DGRAM) { | |
876 | err = dev_hard_header(skb, dev, ntohs(proto), addr, | |
877 | NULL, tp_len); | |
878 | if (unlikely(err < 0)) | |
879 | return -EINVAL; | |
40d4e3df | 880 | } else if (dev->hard_header_len) { |
69e3c75f JB |
881 | /* net device doesn't like empty head */ |
882 | if (unlikely(tp_len <= dev->hard_header_len)) { | |
40d4e3df ED |
883 | pr_err("packet size is too short (%d < %d)\n", |
884 | tp_len, dev->hard_header_len); | |
69e3c75f JB |
885 | return -EINVAL; |
886 | } | |
887 | ||
888 | skb_push(skb, dev->hard_header_len); | |
889 | err = skb_store_bits(skb, 0, data, | |
890 | dev->hard_header_len); | |
891 | if (unlikely(err)) | |
892 | return err; | |
893 | ||
894 | data += dev->hard_header_len; | |
895 | to_write -= dev->hard_header_len; | |
896 | } | |
897 | ||
898 | err = -EFAULT; | |
899 | page = virt_to_page(data); | |
900 | offset = offset_in_page(data); | |
901 | len_max = PAGE_SIZE - offset; | |
902 | len = ((to_write > len_max) ? len_max : to_write); | |
903 | ||
904 | skb->data_len = to_write; | |
905 | skb->len += to_write; | |
906 | skb->truesize += to_write; | |
907 | atomic_add(to_write, &po->sk.sk_wmem_alloc); | |
908 | ||
909 | while (likely(to_write)) { | |
910 | nr_frags = skb_shinfo(skb)->nr_frags; | |
911 | ||
912 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { | |
40d4e3df ED |
913 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
914 | MAX_SKB_FRAGS); | |
69e3c75f JB |
915 | return -EFAULT; |
916 | } | |
917 | ||
918 | flush_dcache_page(page); | |
919 | get_page(page); | |
920 | skb_fill_page_desc(skb, | |
921 | nr_frags, | |
922 | page++, offset, len); | |
923 | to_write -= len; | |
924 | offset = 0; | |
925 | len_max = PAGE_SIZE; | |
926 | len = ((to_write > len_max) ? len_max : to_write); | |
927 | } | |
928 | ||
929 | return tp_len; | |
930 | } | |
931 | ||
932 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) | |
933 | { | |
934 | struct socket *sock; | |
935 | struct sk_buff *skb; | |
936 | struct net_device *dev; | |
937 | __be16 proto; | |
938 | int ifindex, err, reserve = 0; | |
40d4e3df ED |
939 | void *ph; |
940 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; | |
69e3c75f JB |
941 | int tp_len, size_max; |
942 | unsigned char *addr; | |
943 | int len_sum = 0; | |
944 | int status = 0; | |
945 | ||
946 | sock = po->sk.sk_socket; | |
947 | ||
948 | mutex_lock(&po->pg_vec_lock); | |
949 | ||
950 | err = -EBUSY; | |
951 | if (saddr == NULL) { | |
952 | ifindex = po->ifindex; | |
953 | proto = po->num; | |
954 | addr = NULL; | |
955 | } else { | |
956 | err = -EINVAL; | |
957 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
958 | goto out; | |
959 | if (msg->msg_namelen < (saddr->sll_halen | |
960 | + offsetof(struct sockaddr_ll, | |
961 | sll_addr))) | |
962 | goto out; | |
963 | ifindex = saddr->sll_ifindex; | |
964 | proto = saddr->sll_protocol; | |
965 | addr = saddr->sll_addr; | |
966 | } | |
967 | ||
968 | dev = dev_get_by_index(sock_net(&po->sk), ifindex); | |
969 | err = -ENXIO; | |
970 | if (unlikely(dev == NULL)) | |
971 | goto out; | |
972 | ||
973 | reserve = dev->hard_header_len; | |
974 | ||
975 | err = -ENETDOWN; | |
976 | if (unlikely(!(dev->flags & IFF_UP))) | |
977 | goto out_put; | |
978 | ||
979 | size_max = po->tx_ring.frame_size | |
b5dd884e | 980 | - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
69e3c75f JB |
981 | |
982 | if (size_max > dev->mtu + reserve) | |
983 | size_max = dev->mtu + reserve; | |
984 | ||
985 | do { | |
986 | ph = packet_current_frame(po, &po->tx_ring, | |
987 | TP_STATUS_SEND_REQUEST); | |
988 | ||
989 | if (unlikely(ph == NULL)) { | |
990 | schedule(); | |
991 | continue; | |
992 | } | |
993 | ||
994 | status = TP_STATUS_SEND_REQUEST; | |
995 | skb = sock_alloc_send_skb(&po->sk, | |
996 | LL_ALLOCATED_SPACE(dev) | |
997 | + sizeof(struct sockaddr_ll), | |
998 | 0, &err); | |
999 | ||
1000 | if (unlikely(skb == NULL)) | |
1001 | goto out_status; | |
1002 | ||
1003 | tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto, | |
1004 | addr); | |
1005 | ||
1006 | if (unlikely(tp_len < 0)) { | |
1007 | if (po->tp_loss) { | |
1008 | __packet_set_status(po, ph, | |
1009 | TP_STATUS_AVAILABLE); | |
1010 | packet_increment_head(&po->tx_ring); | |
1011 | kfree_skb(skb); | |
1012 | continue; | |
1013 | } else { | |
1014 | status = TP_STATUS_WRONG_FORMAT; | |
1015 | err = tp_len; | |
1016 | goto out_status; | |
1017 | } | |
1018 | } | |
1019 | ||
1020 | skb->destructor = tpacket_destruct_skb; | |
1021 | __packet_set_status(po, ph, TP_STATUS_SENDING); | |
1022 | atomic_inc(&po->tx_ring.pending); | |
1023 | ||
1024 | status = TP_STATUS_SEND_REQUEST; | |
1025 | err = dev_queue_xmit(skb); | |
eb70df13 JP |
1026 | if (unlikely(err > 0)) { |
1027 | err = net_xmit_errno(err); | |
1028 | if (err && __packet_get_status(po, ph) == | |
1029 | TP_STATUS_AVAILABLE) { | |
1030 | /* skb was destructed already */ | |
1031 | skb = NULL; | |
1032 | goto out_status; | |
1033 | } | |
1034 | /* | |
1035 | * skb was dropped but not destructed yet; | |
1036 | * let's treat it like congestion or err < 0 | |
1037 | */ | |
1038 | err = 0; | |
1039 | } | |
69e3c75f JB |
1040 | packet_increment_head(&po->tx_ring); |
1041 | len_sum += tp_len; | |
f64f9e71 JP |
1042 | } while (likely((ph != NULL) || |
1043 | ((!(msg->msg_flags & MSG_DONTWAIT)) && | |
1044 | (atomic_read(&po->tx_ring.pending)))) | |
1045 | ); | |
69e3c75f JB |
1046 | |
1047 | err = len_sum; | |
1048 | goto out_put; | |
1049 | ||
69e3c75f JB |
1050 | out_status: |
1051 | __packet_set_status(po, ph, status); | |
1052 | kfree_skb(skb); | |
1053 | out_put: | |
1054 | dev_put(dev); | |
1055 | out: | |
1056 | mutex_unlock(&po->pg_vec_lock); | |
1057 | return err; | |
1058 | } | |
1059 | #endif | |
1060 | ||
bfd5f4a3 SS |
1061 | static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad, |
1062 | size_t reserve, size_t len, | |
1063 | size_t linear, int noblock, | |
1064 | int *err) | |
1065 | { | |
1066 | struct sk_buff *skb; | |
1067 | ||
1068 | /* Under a page? Don't bother with paged skb. */ | |
1069 | if (prepad + len < PAGE_SIZE || !linear) | |
1070 | linear = len; | |
1071 | ||
1072 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, | |
1073 | err); | |
1074 | if (!skb) | |
1075 | return NULL; | |
1076 | ||
1077 | skb_reserve(skb, reserve); | |
1078 | skb_put(skb, linear); | |
1079 | skb->data_len = len - linear; | |
1080 | skb->len += len - linear; | |
1081 | ||
1082 | return skb; | |
1083 | } | |
1084 | ||
69e3c75f | 1085 | static int packet_snd(struct socket *sock, |
1da177e4 LT |
1086 | struct msghdr *msg, size_t len) |
1087 | { | |
1088 | struct sock *sk = sock->sk; | |
40d4e3df | 1089 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
1da177e4 LT |
1090 | struct sk_buff *skb; |
1091 | struct net_device *dev; | |
0e11c91e | 1092 | __be16 proto; |
1da177e4 LT |
1093 | unsigned char *addr; |
1094 | int ifindex, err, reserve = 0; | |
bfd5f4a3 SS |
1095 | struct virtio_net_hdr vnet_hdr = { 0 }; |
1096 | int offset = 0; | |
1097 | int vnet_hdr_len; | |
1098 | struct packet_sock *po = pkt_sk(sk); | |
1099 | unsigned short gso_type = 0; | |
1da177e4 LT |
1100 | |
1101 | /* | |
1ce4f28b | 1102 | * Get and verify the address. |
1da177e4 | 1103 | */ |
1ce4f28b | 1104 | |
1da177e4 | 1105 | if (saddr == NULL) { |
1da177e4 LT |
1106 | ifindex = po->ifindex; |
1107 | proto = po->num; | |
1108 | addr = NULL; | |
1109 | } else { | |
1110 | err = -EINVAL; | |
1111 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
1112 | goto out; | |
0fb375fb EB |
1113 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
1114 | goto out; | |
1da177e4 LT |
1115 | ifindex = saddr->sll_ifindex; |
1116 | proto = saddr->sll_protocol; | |
1117 | addr = saddr->sll_addr; | |
1118 | } | |
1119 | ||
1120 | ||
3b1e0a65 | 1121 | dev = dev_get_by_index(sock_net(sk), ifindex); |
1da177e4 LT |
1122 | err = -ENXIO; |
1123 | if (dev == NULL) | |
1124 | goto out_unlock; | |
1125 | if (sock->type == SOCK_RAW) | |
1126 | reserve = dev->hard_header_len; | |
1127 | ||
d5e76b0a DM |
1128 | err = -ENETDOWN; |
1129 | if (!(dev->flags & IFF_UP)) | |
1130 | goto out_unlock; | |
1131 | ||
bfd5f4a3 SS |
1132 | if (po->has_vnet_hdr) { |
1133 | vnet_hdr_len = sizeof(vnet_hdr); | |
1134 | ||
1135 | err = -EINVAL; | |
1136 | if (len < vnet_hdr_len) | |
1137 | goto out_unlock; | |
1138 | ||
1139 | len -= vnet_hdr_len; | |
1140 | ||
1141 | err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov, | |
1142 | vnet_hdr_len); | |
1143 | if (err < 0) | |
1144 | goto out_unlock; | |
1145 | ||
1146 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && | |
1147 | (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 > | |
1148 | vnet_hdr.hdr_len)) | |
1149 | vnet_hdr.hdr_len = vnet_hdr.csum_start + | |
1150 | vnet_hdr.csum_offset + 2; | |
1151 | ||
1152 | err = -EINVAL; | |
1153 | if (vnet_hdr.hdr_len > len) | |
1154 | goto out_unlock; | |
1155 | ||
1156 | if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
1157 | switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
1158 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
1159 | gso_type = SKB_GSO_TCPV4; | |
1160 | break; | |
1161 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
1162 | gso_type = SKB_GSO_TCPV6; | |
1163 | break; | |
1164 | case VIRTIO_NET_HDR_GSO_UDP: | |
1165 | gso_type = SKB_GSO_UDP; | |
1166 | break; | |
1167 | default: | |
1168 | goto out_unlock; | |
1169 | } | |
1170 | ||
1171 | if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
1172 | gso_type |= SKB_GSO_TCP_ECN; | |
1173 | ||
1174 | if (vnet_hdr.gso_size == 0) | |
1175 | goto out_unlock; | |
1176 | ||
1177 | } | |
1178 | } | |
1179 | ||
1da177e4 | 1180 | err = -EMSGSIZE; |
bfd5f4a3 | 1181 | if (!gso_type && (len > dev->mtu+reserve)) |
1da177e4 LT |
1182 | goto out_unlock; |
1183 | ||
bfd5f4a3 SS |
1184 | err = -ENOBUFS; |
1185 | skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev), | |
1186 | LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len, | |
1187 | msg->msg_flags & MSG_DONTWAIT, &err); | |
40d4e3df | 1188 | if (skb == NULL) |
1da177e4 LT |
1189 | goto out_unlock; |
1190 | ||
bfd5f4a3 | 1191 | skb_set_network_header(skb, reserve); |
1da177e4 | 1192 | |
0c4e8581 SH |
1193 | err = -EINVAL; |
1194 | if (sock->type == SOCK_DGRAM && | |
bfd5f4a3 | 1195 | (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0) |
0c4e8581 | 1196 | goto out_free; |
1da177e4 LT |
1197 | |
1198 | /* Returns -EFAULT on error */ | |
bfd5f4a3 | 1199 | err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len); |
1da177e4 LT |
1200 | if (err) |
1201 | goto out_free; | |
1202 | ||
1203 | skb->protocol = proto; | |
1204 | skb->dev = dev; | |
1205 | skb->priority = sk->sk_priority; | |
2d37a186 | 1206 | skb->mark = sk->sk_mark; |
1da177e4 | 1207 | |
bfd5f4a3 SS |
1208 | if (po->has_vnet_hdr) { |
1209 | if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
1210 | if (!skb_partial_csum_set(skb, vnet_hdr.csum_start, | |
1211 | vnet_hdr.csum_offset)) { | |
1212 | err = -EINVAL; | |
1213 | goto out_free; | |
1214 | } | |
1215 | } | |
1216 | ||
1217 | skb_shinfo(skb)->gso_size = vnet_hdr.gso_size; | |
1218 | skb_shinfo(skb)->gso_type = gso_type; | |
1219 | ||
1220 | /* Header must be checked, and gso_segs computed. */ | |
1221 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
1222 | skb_shinfo(skb)->gso_segs = 0; | |
1223 | ||
1224 | len += vnet_hdr_len; | |
1225 | } | |
1226 | ||
1da177e4 LT |
1227 | /* |
1228 | * Now send it | |
1229 | */ | |
1230 | ||
1231 | err = dev_queue_xmit(skb); | |
1232 | if (err > 0 && (err = net_xmit_errno(err)) != 0) | |
1233 | goto out_unlock; | |
1234 | ||
1235 | dev_put(dev); | |
1236 | ||
40d4e3df | 1237 | return len; |
1da177e4 LT |
1238 | |
1239 | out_free: | |
1240 | kfree_skb(skb); | |
1241 | out_unlock: | |
1242 | if (dev) | |
1243 | dev_put(dev); | |
1244 | out: | |
1245 | return err; | |
1246 | } | |
1247 | ||
69e3c75f JB |
1248 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
1249 | struct msghdr *msg, size_t len) | |
1250 | { | |
1251 | #ifdef CONFIG_PACKET_MMAP | |
1252 | struct sock *sk = sock->sk; | |
1253 | struct packet_sock *po = pkt_sk(sk); | |
1254 | if (po->tx_ring.pg_vec) | |
1255 | return tpacket_snd(po, msg); | |
1256 | else | |
1257 | #endif | |
1258 | return packet_snd(sock, msg, len); | |
1259 | } | |
1260 | ||
1da177e4 LT |
1261 | /* |
1262 | * Close a PACKET socket. This is fairly simple. We immediately go | |
1263 | * to 'closed' state and remove our protocol entry in the device list. | |
1264 | */ | |
1265 | ||
1266 | static int packet_release(struct socket *sock) | |
1267 | { | |
1268 | struct sock *sk = sock->sk; | |
1269 | struct packet_sock *po; | |
d12d01d6 | 1270 | struct net *net; |
69e3c75f JB |
1271 | #ifdef CONFIG_PACKET_MMAP |
1272 | struct tpacket_req req; | |
1273 | #endif | |
1da177e4 LT |
1274 | |
1275 | if (!sk) | |
1276 | return 0; | |
1277 | ||
3b1e0a65 | 1278 | net = sock_net(sk); |
1da177e4 LT |
1279 | po = pkt_sk(sk); |
1280 | ||
2aaef4e4 | 1281 | write_lock_bh(&net->packet.sklist_lock); |
1da177e4 | 1282 | sk_del_node_init(sk); |
920de804 | 1283 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
2aaef4e4 | 1284 | write_unlock_bh(&net->packet.sklist_lock); |
1da177e4 LT |
1285 | |
1286 | /* | |
1287 | * Unhook packet receive handler. | |
1288 | */ | |
1289 | ||
1290 | if (po->running) { | |
1291 | /* | |
1292 | * Remove the protocol hook | |
1293 | */ | |
1294 | dev_remove_pack(&po->prot_hook); | |
1295 | po->running = 0; | |
1296 | po->num = 0; | |
1297 | __sock_put(sk); | |
1298 | } | |
1299 | ||
1da177e4 | 1300 | packet_flush_mclist(sk); |
1da177e4 LT |
1301 | |
1302 | #ifdef CONFIG_PACKET_MMAP | |
69e3c75f JB |
1303 | memset(&req, 0, sizeof(req)); |
1304 | ||
1305 | if (po->rx_ring.pg_vec) | |
1306 | packet_set_ring(sk, &req, 1, 0); | |
1307 | ||
1308 | if (po->tx_ring.pg_vec) | |
1309 | packet_set_ring(sk, &req, 1, 1); | |
1da177e4 LT |
1310 | #endif |
1311 | ||
1312 | /* | |
1313 | * Now the socket is dead. No more input will appear. | |
1314 | */ | |
1315 | ||
1316 | sock_orphan(sk); | |
1317 | sock->sk = NULL; | |
1318 | ||
1319 | /* Purge queues */ | |
1320 | ||
1321 | skb_queue_purge(&sk->sk_receive_queue); | |
17ab56a2 | 1322 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
1323 | |
1324 | sock_put(sk); | |
1325 | return 0; | |
1326 | } | |
1327 | ||
1328 | /* | |
1329 | * Attach a packet hook. | |
1330 | */ | |
1331 | ||
0e11c91e | 1332 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
1da177e4 LT |
1333 | { |
1334 | struct packet_sock *po = pkt_sk(sk); | |
1335 | /* | |
1336 | * Detach an existing hook if present. | |
1337 | */ | |
1338 | ||
1339 | lock_sock(sk); | |
1340 | ||
1341 | spin_lock(&po->bind_lock); | |
1342 | if (po->running) { | |
1343 | __sock_put(sk); | |
1344 | po->running = 0; | |
1345 | po->num = 0; | |
1346 | spin_unlock(&po->bind_lock); | |
1347 | dev_remove_pack(&po->prot_hook); | |
1348 | spin_lock(&po->bind_lock); | |
1349 | } | |
1350 | ||
1351 | po->num = protocol; | |
1352 | po->prot_hook.type = protocol; | |
1353 | po->prot_hook.dev = dev; | |
1354 | ||
1355 | po->ifindex = dev ? dev->ifindex : 0; | |
1356 | ||
1357 | if (protocol == 0) | |
1358 | goto out_unlock; | |
1359 | ||
be85d4ad | 1360 | if (!dev || (dev->flags & IFF_UP)) { |
1da177e4 LT |
1361 | dev_add_pack(&po->prot_hook); |
1362 | sock_hold(sk); | |
1363 | po->running = 1; | |
be85d4ad UT |
1364 | } else { |
1365 | sk->sk_err = ENETDOWN; | |
1366 | if (!sock_flag(sk, SOCK_DEAD)) | |
1367 | sk->sk_error_report(sk); | |
1da177e4 LT |
1368 | } |
1369 | ||
1370 | out_unlock: | |
1371 | spin_unlock(&po->bind_lock); | |
1372 | release_sock(sk); | |
1373 | return 0; | |
1374 | } | |
1375 | ||
1376 | /* | |
1377 | * Bind a packet socket to a device | |
1378 | */ | |
1379 | ||
40d4e3df ED |
1380 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
1381 | int addr_len) | |
1da177e4 | 1382 | { |
40d4e3df | 1383 | struct sock *sk = sock->sk; |
1da177e4 LT |
1384 | char name[15]; |
1385 | struct net_device *dev; | |
1386 | int err = -ENODEV; | |
1ce4f28b | 1387 | |
1da177e4 LT |
1388 | /* |
1389 | * Check legality | |
1390 | */ | |
1ce4f28b | 1391 | |
8ae55f04 | 1392 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 | 1393 | return -EINVAL; |
40d4e3df | 1394 | strlcpy(name, uaddr->sa_data, sizeof(name)); |
1da177e4 | 1395 | |
3b1e0a65 | 1396 | dev = dev_get_by_name(sock_net(sk), name); |
1da177e4 LT |
1397 | if (dev) { |
1398 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); | |
1399 | dev_put(dev); | |
1400 | } | |
1401 | return err; | |
1402 | } | |
1da177e4 LT |
1403 | |
1404 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
1405 | { | |
40d4e3df ED |
1406 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
1407 | struct sock *sk = sock->sk; | |
1da177e4 LT |
1408 | struct net_device *dev = NULL; |
1409 | int err; | |
1410 | ||
1411 | ||
1412 | /* | |
1413 | * Check legality | |
1414 | */ | |
1ce4f28b | 1415 | |
1da177e4 LT |
1416 | if (addr_len < sizeof(struct sockaddr_ll)) |
1417 | return -EINVAL; | |
1418 | if (sll->sll_family != AF_PACKET) | |
1419 | return -EINVAL; | |
1420 | ||
1421 | if (sll->sll_ifindex) { | |
1422 | err = -ENODEV; | |
3b1e0a65 | 1423 | dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex); |
1da177e4 LT |
1424 | if (dev == NULL) |
1425 | goto out; | |
1426 | } | |
1427 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
1428 | if (dev) | |
1429 | dev_put(dev); | |
1430 | ||
1431 | out: | |
1432 | return err; | |
1433 | } | |
1434 | ||
1435 | static struct proto packet_proto = { | |
1436 | .name = "PACKET", | |
1437 | .owner = THIS_MODULE, | |
1438 | .obj_size = sizeof(struct packet_sock), | |
1439 | }; | |
1440 | ||
1441 | /* | |
1ce4f28b | 1442 | * Create a packet of type SOCK_PACKET. |
1da177e4 LT |
1443 | */ |
1444 | ||
3f378b68 EP |
1445 | static int packet_create(struct net *net, struct socket *sock, int protocol, |
1446 | int kern) | |
1da177e4 LT |
1447 | { |
1448 | struct sock *sk; | |
1449 | struct packet_sock *po; | |
0e11c91e | 1450 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1da177e4 LT |
1451 | int err; |
1452 | ||
1453 | if (!capable(CAP_NET_RAW)) | |
1454 | return -EPERM; | |
be02097c DM |
1455 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
1456 | sock->type != SOCK_PACKET) | |
1da177e4 LT |
1457 | return -ESOCKTNOSUPPORT; |
1458 | ||
1459 | sock->state = SS_UNCONNECTED; | |
1460 | ||
1461 | err = -ENOBUFS; | |
6257ff21 | 1462 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto); |
1da177e4 LT |
1463 | if (sk == NULL) |
1464 | goto out; | |
1465 | ||
1466 | sock->ops = &packet_ops; | |
1da177e4 LT |
1467 | if (sock->type == SOCK_PACKET) |
1468 | sock->ops = &packet_ops_spkt; | |
be02097c | 1469 | |
1da177e4 LT |
1470 | sock_init_data(sock, sk); |
1471 | ||
1472 | po = pkt_sk(sk); | |
1473 | sk->sk_family = PF_PACKET; | |
0e11c91e | 1474 | po->num = proto; |
1da177e4 LT |
1475 | |
1476 | sk->sk_destruct = packet_sock_destruct; | |
17ab56a2 | 1477 | sk_refcnt_debug_inc(sk); |
1da177e4 LT |
1478 | |
1479 | /* | |
1480 | * Attach a protocol block | |
1481 | */ | |
1482 | ||
1483 | spin_lock_init(&po->bind_lock); | |
905db440 | 1484 | mutex_init(&po->pg_vec_lock); |
1da177e4 | 1485 | po->prot_hook.func = packet_rcv; |
be02097c | 1486 | |
1da177e4 LT |
1487 | if (sock->type == SOCK_PACKET) |
1488 | po->prot_hook.func = packet_rcv_spkt; | |
be02097c | 1489 | |
1da177e4 LT |
1490 | po->prot_hook.af_packet_priv = sk; |
1491 | ||
0e11c91e AV |
1492 | if (proto) { |
1493 | po->prot_hook.type = proto; | |
1da177e4 LT |
1494 | dev_add_pack(&po->prot_hook); |
1495 | sock_hold(sk); | |
1496 | po->running = 1; | |
1497 | } | |
1498 | ||
2aaef4e4 DL |
1499 | write_lock_bh(&net->packet.sklist_lock); |
1500 | sk_add_node(sk, &net->packet.sklist); | |
3680453c | 1501 | sock_prot_inuse_add(net, &packet_proto, 1); |
920de804 | 1502 | write_unlock_bh(&net->packet.sklist_lock); |
40d4e3df | 1503 | return 0; |
1da177e4 LT |
1504 | out: |
1505 | return err; | |
1506 | } | |
1507 | ||
1508 | /* | |
1509 | * Pull a packet from our receive queue and hand it to the user. | |
1510 | * If necessary we block. | |
1511 | */ | |
1512 | ||
1513 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1514 | struct msghdr *msg, size_t len, int flags) | |
1515 | { | |
1516 | struct sock *sk = sock->sk; | |
1517 | struct sk_buff *skb; | |
1518 | int copied, err; | |
0fb375fb | 1519 | struct sockaddr_ll *sll; |
bfd5f4a3 | 1520 | int vnet_hdr_len = 0; |
1da177e4 LT |
1521 | |
1522 | err = -EINVAL; | |
1523 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) | |
1524 | goto out; | |
1525 | ||
1526 | #if 0 | |
1527 | /* What error should we return now? EUNATTACH? */ | |
1528 | if (pkt_sk(sk)->ifindex < 0) | |
1529 | return -ENODEV; | |
1530 | #endif | |
1531 | ||
1da177e4 LT |
1532 | /* |
1533 | * Call the generic datagram receiver. This handles all sorts | |
1534 | * of horrible races and re-entrancy so we can forget about it | |
1535 | * in the protocol layers. | |
1536 | * | |
1537 | * Now it will return ENETDOWN, if device have just gone down, | |
1538 | * but then it will block. | |
1539 | */ | |
1540 | ||
40d4e3df | 1541 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
1da177e4 LT |
1542 | |
1543 | /* | |
1ce4f28b | 1544 | * An error occurred so return it. Because skb_recv_datagram() |
1da177e4 LT |
1545 | * handles the blocking we don't see and worry about blocking |
1546 | * retries. | |
1547 | */ | |
1548 | ||
8ae55f04 | 1549 | if (skb == NULL) |
1da177e4 LT |
1550 | goto out; |
1551 | ||
bfd5f4a3 SS |
1552 | if (pkt_sk(sk)->has_vnet_hdr) { |
1553 | struct virtio_net_hdr vnet_hdr = { 0 }; | |
1554 | ||
1555 | err = -EINVAL; | |
1556 | vnet_hdr_len = sizeof(vnet_hdr); | |
1557 | if ((len -= vnet_hdr_len) < 0) | |
1558 | goto out_free; | |
1559 | ||
1560 | if (skb_is_gso(skb)) { | |
1561 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
1562 | ||
1563 | /* This is a hint as to how much should be linear. */ | |
1564 | vnet_hdr.hdr_len = skb_headlen(skb); | |
1565 | vnet_hdr.gso_size = sinfo->gso_size; | |
1566 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
1567 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
1568 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
1569 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
1570 | else if (sinfo->gso_type & SKB_GSO_UDP) | |
1571 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
1572 | else if (sinfo->gso_type & SKB_GSO_FCOE) | |
1573 | goto out_free; | |
1574 | else | |
1575 | BUG(); | |
1576 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
1577 | vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
1578 | } else | |
1579 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
1580 | ||
1581 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
1582 | vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
1583 | vnet_hdr.csum_start = skb->csum_start - | |
1584 | skb_headroom(skb); | |
1585 | vnet_hdr.csum_offset = skb->csum_offset; | |
1586 | } /* else everything is zero */ | |
1587 | ||
1588 | err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr, | |
1589 | vnet_hdr_len); | |
1590 | if (err < 0) | |
1591 | goto out_free; | |
1592 | } | |
1593 | ||
0fb375fb EB |
1594 | /* |
1595 | * If the address length field is there to be filled in, we fill | |
1596 | * it in now. | |
1597 | */ | |
1598 | ||
ffbc6111 | 1599 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
0fb375fb EB |
1600 | if (sock->type == SOCK_PACKET) |
1601 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
1602 | else | |
1603 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); | |
1604 | ||
1da177e4 LT |
1605 | /* |
1606 | * You lose any data beyond the buffer you gave. If it worries a | |
1607 | * user program they can ask the device for its MTU anyway. | |
1608 | */ | |
1609 | ||
1610 | copied = skb->len; | |
40d4e3df ED |
1611 | if (copied > len) { |
1612 | copied = len; | |
1613 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 LT |
1614 | } |
1615 | ||
1616 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1617 | if (err) | |
1618 | goto out_free; | |
1619 | ||
3b885787 | 1620 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
1621 | |
1622 | if (msg->msg_name) | |
ffbc6111 HX |
1623 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
1624 | msg->msg_namelen); | |
1da177e4 | 1625 | |
8dc41944 | 1626 | if (pkt_sk(sk)->auxdata) { |
ffbc6111 HX |
1627 | struct tpacket_auxdata aux; |
1628 | ||
1629 | aux.tp_status = TP_STATUS_USER; | |
1630 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
1631 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; | |
1632 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; | |
1633 | aux.tp_snaplen = skb->len; | |
1634 | aux.tp_mac = 0; | |
bbe735e4 | 1635 | aux.tp_net = skb_network_offset(skb); |
05423b24 | 1636 | aux.tp_vlan_tci = vlan_tx_tag_get(skb); |
ffbc6111 HX |
1637 | |
1638 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); | |
8dc41944 HX |
1639 | } |
1640 | ||
1da177e4 LT |
1641 | /* |
1642 | * Free or return the buffer as appropriate. Again this | |
1643 | * hides all the races and re-entrancy issues from us. | |
1644 | */ | |
bfd5f4a3 | 1645 | err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied); |
1da177e4 LT |
1646 | |
1647 | out_free: | |
1648 | skb_free_datagram(sk, skb); | |
1649 | out: | |
1650 | return err; | |
1651 | } | |
1652 | ||
1da177e4 LT |
1653 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
1654 | int *uaddr_len, int peer) | |
1655 | { | |
1656 | struct net_device *dev; | |
1657 | struct sock *sk = sock->sk; | |
1658 | ||
1659 | if (peer) | |
1660 | return -EOPNOTSUPP; | |
1661 | ||
1662 | uaddr->sa_family = AF_PACKET; | |
654d1f8a ED |
1663 | rcu_read_lock(); |
1664 | dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); | |
1665 | if (dev) | |
1da177e4 | 1666 | strlcpy(uaddr->sa_data, dev->name, 15); |
654d1f8a | 1667 | else |
1da177e4 | 1668 | memset(uaddr->sa_data, 0, 14); |
654d1f8a | 1669 | rcu_read_unlock(); |
1da177e4 LT |
1670 | *uaddr_len = sizeof(*uaddr); |
1671 | ||
1672 | return 0; | |
1673 | } | |
1da177e4 LT |
1674 | |
1675 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
1676 | int *uaddr_len, int peer) | |
1677 | { | |
1678 | struct net_device *dev; | |
1679 | struct sock *sk = sock->sk; | |
1680 | struct packet_sock *po = pkt_sk(sk); | |
13cfa97b | 1681 | DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr); |
1da177e4 LT |
1682 | |
1683 | if (peer) | |
1684 | return -EOPNOTSUPP; | |
1685 | ||
1686 | sll->sll_family = AF_PACKET; | |
1687 | sll->sll_ifindex = po->ifindex; | |
1688 | sll->sll_protocol = po->num; | |
654d1f8a ED |
1689 | rcu_read_lock(); |
1690 | dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex); | |
1da177e4 LT |
1691 | if (dev) { |
1692 | sll->sll_hatype = dev->type; | |
1693 | sll->sll_halen = dev->addr_len; | |
1694 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1da177e4 LT |
1695 | } else { |
1696 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
1697 | sll->sll_halen = 0; | |
1698 | } | |
654d1f8a | 1699 | rcu_read_unlock(); |
0fb375fb | 1700 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
1701 | |
1702 | return 0; | |
1703 | } | |
1704 | ||
2aeb0b88 WC |
1705 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
1706 | int what) | |
1da177e4 LT |
1707 | { |
1708 | switch (i->type) { | |
1709 | case PACKET_MR_MULTICAST: | |
1710 | if (what > 0) | |
d95ed927 | 1711 | return dev_mc_add(dev, i->addr, i->alen, 0); |
1da177e4 | 1712 | else |
d95ed927 | 1713 | return dev_mc_delete(dev, i->addr, i->alen, 0); |
1da177e4 LT |
1714 | break; |
1715 | case PACKET_MR_PROMISC: | |
2aeb0b88 | 1716 | return dev_set_promiscuity(dev, what); |
1da177e4 LT |
1717 | break; |
1718 | case PACKET_MR_ALLMULTI: | |
2aeb0b88 | 1719 | return dev_set_allmulti(dev, what); |
1da177e4 | 1720 | break; |
d95ed927 EB |
1721 | case PACKET_MR_UNICAST: |
1722 | if (what > 0) | |
ccffad25 | 1723 | return dev_unicast_add(dev, i->addr); |
d95ed927 | 1724 | else |
ccffad25 | 1725 | return dev_unicast_delete(dev, i->addr); |
d95ed927 | 1726 | break; |
40d4e3df ED |
1727 | default: |
1728 | break; | |
1da177e4 | 1729 | } |
2aeb0b88 | 1730 | return 0; |
1da177e4 LT |
1731 | } |
1732 | ||
1733 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
1734 | { | |
40d4e3df | 1735 | for ( ; i; i = i->next) { |
1da177e4 LT |
1736 | if (i->ifindex == dev->ifindex) |
1737 | packet_dev_mc(dev, i, what); | |
1738 | } | |
1739 | } | |
1740 | ||
0fb375fb | 1741 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1742 | { |
1743 | struct packet_sock *po = pkt_sk(sk); | |
1744 | struct packet_mclist *ml, *i; | |
1745 | struct net_device *dev; | |
1746 | int err; | |
1747 | ||
1748 | rtnl_lock(); | |
1749 | ||
1750 | err = -ENODEV; | |
3b1e0a65 | 1751 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
1da177e4 LT |
1752 | if (!dev) |
1753 | goto done; | |
1754 | ||
1755 | err = -EINVAL; | |
1756 | if (mreq->mr_alen > dev->addr_len) | |
1757 | goto done; | |
1758 | ||
1759 | err = -ENOBUFS; | |
8b3a7005 | 1760 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
1761 | if (i == NULL) |
1762 | goto done; | |
1763 | ||
1764 | err = 0; | |
1765 | for (ml = po->mclist; ml; ml = ml->next) { | |
1766 | if (ml->ifindex == mreq->mr_ifindex && | |
1767 | ml->type == mreq->mr_type && | |
1768 | ml->alen == mreq->mr_alen && | |
1769 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1770 | ml->count++; | |
1771 | /* Free the new element ... */ | |
1772 | kfree(i); | |
1773 | goto done; | |
1774 | } | |
1775 | } | |
1776 | ||
1777 | i->type = mreq->mr_type; | |
1778 | i->ifindex = mreq->mr_ifindex; | |
1779 | i->alen = mreq->mr_alen; | |
1780 | memcpy(i->addr, mreq->mr_address, i->alen); | |
1781 | i->count = 1; | |
1782 | i->next = po->mclist; | |
1783 | po->mclist = i; | |
2aeb0b88 WC |
1784 | err = packet_dev_mc(dev, i, 1); |
1785 | if (err) { | |
1786 | po->mclist = i->next; | |
1787 | kfree(i); | |
1788 | } | |
1da177e4 LT |
1789 | |
1790 | done: | |
1791 | rtnl_unlock(); | |
1792 | return err; | |
1793 | } | |
1794 | ||
0fb375fb | 1795 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1796 | { |
1797 | struct packet_mclist *ml, **mlp; | |
1798 | ||
1799 | rtnl_lock(); | |
1800 | ||
1801 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
1802 | if (ml->ifindex == mreq->mr_ifindex && | |
1803 | ml->type == mreq->mr_type && | |
1804 | ml->alen == mreq->mr_alen && | |
1805 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1806 | if (--ml->count == 0) { | |
1807 | struct net_device *dev; | |
1808 | *mlp = ml->next; | |
ad959e76 ED |
1809 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1810 | if (dev) | |
1da177e4 | 1811 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
1812 | kfree(ml); |
1813 | } | |
1814 | rtnl_unlock(); | |
1815 | return 0; | |
1816 | } | |
1817 | } | |
1818 | rtnl_unlock(); | |
1819 | return -EADDRNOTAVAIL; | |
1820 | } | |
1821 | ||
1822 | static void packet_flush_mclist(struct sock *sk) | |
1823 | { | |
1824 | struct packet_sock *po = pkt_sk(sk); | |
1825 | struct packet_mclist *ml; | |
1826 | ||
1827 | if (!po->mclist) | |
1828 | return; | |
1829 | ||
1830 | rtnl_lock(); | |
1831 | while ((ml = po->mclist) != NULL) { | |
1832 | struct net_device *dev; | |
1833 | ||
1834 | po->mclist = ml->next; | |
ad959e76 ED |
1835 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1836 | if (dev != NULL) | |
1da177e4 | 1837 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
1838 | kfree(ml); |
1839 | } | |
1840 | rtnl_unlock(); | |
1841 | } | |
1da177e4 LT |
1842 | |
1843 | static int | |
b7058842 | 1844 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1845 | { |
1846 | struct sock *sk = sock->sk; | |
8dc41944 | 1847 | struct packet_sock *po = pkt_sk(sk); |
1da177e4 LT |
1848 | int ret; |
1849 | ||
1850 | if (level != SOL_PACKET) | |
1851 | return -ENOPROTOOPT; | |
1852 | ||
69e3c75f | 1853 | switch (optname) { |
1ce4f28b | 1854 | case PACKET_ADD_MEMBERSHIP: |
1da177e4 LT |
1855 | case PACKET_DROP_MEMBERSHIP: |
1856 | { | |
0fb375fb EB |
1857 | struct packet_mreq_max mreq; |
1858 | int len = optlen; | |
1859 | memset(&mreq, 0, sizeof(mreq)); | |
1860 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 1861 | return -EINVAL; |
0fb375fb EB |
1862 | if (len > sizeof(mreq)) |
1863 | len = sizeof(mreq); | |
40d4e3df | 1864 | if (copy_from_user(&mreq, optval, len)) |
1da177e4 | 1865 | return -EFAULT; |
0fb375fb EB |
1866 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
1867 | return -EINVAL; | |
1da177e4 LT |
1868 | if (optname == PACKET_ADD_MEMBERSHIP) |
1869 | ret = packet_mc_add(sk, &mreq); | |
1870 | else | |
1871 | ret = packet_mc_drop(sk, &mreq); | |
1872 | return ret; | |
1873 | } | |
a2efcfa0 | 1874 | |
1da177e4 LT |
1875 | #ifdef CONFIG_PACKET_MMAP |
1876 | case PACKET_RX_RING: | |
69e3c75f | 1877 | case PACKET_TX_RING: |
1da177e4 LT |
1878 | { |
1879 | struct tpacket_req req; | |
1880 | ||
40d4e3df | 1881 | if (optlen < sizeof(req)) |
1da177e4 | 1882 | return -EINVAL; |
bfd5f4a3 SS |
1883 | if (pkt_sk(sk)->has_vnet_hdr) |
1884 | return -EINVAL; | |
40d4e3df | 1885 | if (copy_from_user(&req, optval, sizeof(req))) |
1da177e4 | 1886 | return -EFAULT; |
69e3c75f | 1887 | return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING); |
1da177e4 LT |
1888 | } |
1889 | case PACKET_COPY_THRESH: | |
1890 | { | |
1891 | int val; | |
1892 | ||
40d4e3df | 1893 | if (optlen != sizeof(val)) |
1da177e4 | 1894 | return -EINVAL; |
40d4e3df | 1895 | if (copy_from_user(&val, optval, sizeof(val))) |
1da177e4 LT |
1896 | return -EFAULT; |
1897 | ||
1898 | pkt_sk(sk)->copy_thresh = val; | |
1899 | return 0; | |
1900 | } | |
bbd6ef87 PM |
1901 | case PACKET_VERSION: |
1902 | { | |
1903 | int val; | |
1904 | ||
1905 | if (optlen != sizeof(val)) | |
1906 | return -EINVAL; | |
69e3c75f | 1907 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
bbd6ef87 PM |
1908 | return -EBUSY; |
1909 | if (copy_from_user(&val, optval, sizeof(val))) | |
1910 | return -EFAULT; | |
1911 | switch (val) { | |
1912 | case TPACKET_V1: | |
1913 | case TPACKET_V2: | |
1914 | po->tp_version = val; | |
1915 | return 0; | |
1916 | default: | |
1917 | return -EINVAL; | |
1918 | } | |
1919 | } | |
8913336a PM |
1920 | case PACKET_RESERVE: |
1921 | { | |
1922 | unsigned int val; | |
1923 | ||
1924 | if (optlen != sizeof(val)) | |
1925 | return -EINVAL; | |
69e3c75f | 1926 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
8913336a PM |
1927 | return -EBUSY; |
1928 | if (copy_from_user(&val, optval, sizeof(val))) | |
1929 | return -EFAULT; | |
1930 | po->tp_reserve = val; | |
1931 | return 0; | |
1932 | } | |
69e3c75f JB |
1933 | case PACKET_LOSS: |
1934 | { | |
1935 | unsigned int val; | |
1936 | ||
1937 | if (optlen != sizeof(val)) | |
1938 | return -EINVAL; | |
1939 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
1940 | return -EBUSY; | |
1941 | if (copy_from_user(&val, optval, sizeof(val))) | |
1942 | return -EFAULT; | |
1943 | po->tp_loss = !!val; | |
1944 | return 0; | |
1945 | } | |
1da177e4 | 1946 | #endif |
8dc41944 HX |
1947 | case PACKET_AUXDATA: |
1948 | { | |
1949 | int val; | |
1950 | ||
1951 | if (optlen < sizeof(val)) | |
1952 | return -EINVAL; | |
1953 | if (copy_from_user(&val, optval, sizeof(val))) | |
1954 | return -EFAULT; | |
1955 | ||
1956 | po->auxdata = !!val; | |
1957 | return 0; | |
1958 | } | |
80feaacb PWJ |
1959 | case PACKET_ORIGDEV: |
1960 | { | |
1961 | int val; | |
1962 | ||
1963 | if (optlen < sizeof(val)) | |
1964 | return -EINVAL; | |
1965 | if (copy_from_user(&val, optval, sizeof(val))) | |
1966 | return -EFAULT; | |
1967 | ||
1968 | po->origdev = !!val; | |
1969 | return 0; | |
1970 | } | |
bfd5f4a3 SS |
1971 | case PACKET_VNET_HDR: |
1972 | { | |
1973 | int val; | |
1974 | ||
1975 | if (sock->type != SOCK_RAW) | |
1976 | return -EINVAL; | |
1977 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
1978 | return -EBUSY; | |
1979 | if (optlen < sizeof(val)) | |
1980 | return -EINVAL; | |
1981 | if (copy_from_user(&val, optval, sizeof(val))) | |
1982 | return -EFAULT; | |
1983 | ||
1984 | po->has_vnet_hdr = !!val; | |
1985 | return 0; | |
1986 | } | |
1da177e4 LT |
1987 | default: |
1988 | return -ENOPROTOOPT; | |
1989 | } | |
1990 | } | |
1991 | ||
1992 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
1993 | char __user *optval, int __user *optlen) | |
1994 | { | |
1995 | int len; | |
8dc41944 | 1996 | int val; |
1da177e4 LT |
1997 | struct sock *sk = sock->sk; |
1998 | struct packet_sock *po = pkt_sk(sk); | |
8dc41944 HX |
1999 | void *data; |
2000 | struct tpacket_stats st; | |
1da177e4 LT |
2001 | |
2002 | if (level != SOL_PACKET) | |
2003 | return -ENOPROTOOPT; | |
2004 | ||
8ae55f04 KK |
2005 | if (get_user(len, optlen)) |
2006 | return -EFAULT; | |
1da177e4 LT |
2007 | |
2008 | if (len < 0) | |
2009 | return -EINVAL; | |
1ce4f28b | 2010 | |
69e3c75f | 2011 | switch (optname) { |
1da177e4 | 2012 | case PACKET_STATISTICS: |
1da177e4 LT |
2013 | if (len > sizeof(struct tpacket_stats)) |
2014 | len = sizeof(struct tpacket_stats); | |
2015 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
2016 | st = po->stats; | |
2017 | memset(&po->stats, 0, sizeof(st)); | |
2018 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
2019 | st.tp_packets += st.tp_drops; | |
2020 | ||
8dc41944 HX |
2021 | data = &st; |
2022 | break; | |
2023 | case PACKET_AUXDATA: | |
2024 | if (len > sizeof(int)) | |
2025 | len = sizeof(int); | |
2026 | val = po->auxdata; | |
2027 | ||
80feaacb PWJ |
2028 | data = &val; |
2029 | break; | |
2030 | case PACKET_ORIGDEV: | |
2031 | if (len > sizeof(int)) | |
2032 | len = sizeof(int); | |
2033 | val = po->origdev; | |
2034 | ||
bfd5f4a3 SS |
2035 | data = &val; |
2036 | break; | |
2037 | case PACKET_VNET_HDR: | |
2038 | if (len > sizeof(int)) | |
2039 | len = sizeof(int); | |
2040 | val = po->has_vnet_hdr; | |
2041 | ||
8dc41944 | 2042 | data = &val; |
1da177e4 | 2043 | break; |
bbd6ef87 PM |
2044 | #ifdef CONFIG_PACKET_MMAP |
2045 | case PACKET_VERSION: | |
2046 | if (len > sizeof(int)) | |
2047 | len = sizeof(int); | |
2048 | val = po->tp_version; | |
2049 | data = &val; | |
2050 | break; | |
2051 | case PACKET_HDRLEN: | |
2052 | if (len > sizeof(int)) | |
2053 | len = sizeof(int); | |
2054 | if (copy_from_user(&val, optval, len)) | |
2055 | return -EFAULT; | |
2056 | switch (val) { | |
2057 | case TPACKET_V1: | |
2058 | val = sizeof(struct tpacket_hdr); | |
2059 | break; | |
2060 | case TPACKET_V2: | |
2061 | val = sizeof(struct tpacket2_hdr); | |
2062 | break; | |
2063 | default: | |
2064 | return -EINVAL; | |
2065 | } | |
2066 | data = &val; | |
2067 | break; | |
8913336a PM |
2068 | case PACKET_RESERVE: |
2069 | if (len > sizeof(unsigned int)) | |
2070 | len = sizeof(unsigned int); | |
2071 | val = po->tp_reserve; | |
2072 | data = &val; | |
2073 | break; | |
69e3c75f JB |
2074 | case PACKET_LOSS: |
2075 | if (len > sizeof(unsigned int)) | |
2076 | len = sizeof(unsigned int); | |
2077 | val = po->tp_loss; | |
2078 | data = &val; | |
2079 | break; | |
bbd6ef87 | 2080 | #endif |
1da177e4 LT |
2081 | default: |
2082 | return -ENOPROTOOPT; | |
2083 | } | |
2084 | ||
8ae55f04 KK |
2085 | if (put_user(len, optlen)) |
2086 | return -EFAULT; | |
8dc41944 HX |
2087 | if (copy_to_user(optval, data, len)) |
2088 | return -EFAULT; | |
8ae55f04 | 2089 | return 0; |
1da177e4 LT |
2090 | } |
2091 | ||
2092 | ||
2093 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) | |
2094 | { | |
2095 | struct sock *sk; | |
2096 | struct hlist_node *node; | |
ad930650 | 2097 | struct net_device *dev = data; |
c346dca1 | 2098 | struct net *net = dev_net(dev); |
1da177e4 | 2099 | |
2aaef4e4 DL |
2100 | read_lock(&net->packet.sklist_lock); |
2101 | sk_for_each(sk, node, &net->packet.sklist) { | |
1da177e4 LT |
2102 | struct packet_sock *po = pkt_sk(sk); |
2103 | ||
2104 | switch (msg) { | |
2105 | case NETDEV_UNREGISTER: | |
1da177e4 LT |
2106 | if (po->mclist) |
2107 | packet_dev_mclist(dev, po->mclist, -1); | |
a2efcfa0 DM |
2108 | /* fallthrough */ |
2109 | ||
1da177e4 LT |
2110 | case NETDEV_DOWN: |
2111 | if (dev->ifindex == po->ifindex) { | |
2112 | spin_lock(&po->bind_lock); | |
2113 | if (po->running) { | |
2114 | __dev_remove_pack(&po->prot_hook); | |
2115 | __sock_put(sk); | |
2116 | po->running = 0; | |
2117 | sk->sk_err = ENETDOWN; | |
2118 | if (!sock_flag(sk, SOCK_DEAD)) | |
2119 | sk->sk_error_report(sk); | |
2120 | } | |
2121 | if (msg == NETDEV_UNREGISTER) { | |
2122 | po->ifindex = -1; | |
2123 | po->prot_hook.dev = NULL; | |
2124 | } | |
2125 | spin_unlock(&po->bind_lock); | |
2126 | } | |
2127 | break; | |
2128 | case NETDEV_UP: | |
2129 | spin_lock(&po->bind_lock); | |
2130 | if (dev->ifindex == po->ifindex && po->num && | |
2131 | !po->running) { | |
2132 | dev_add_pack(&po->prot_hook); | |
2133 | sock_hold(sk); | |
2134 | po->running = 1; | |
2135 | } | |
2136 | spin_unlock(&po->bind_lock); | |
2137 | break; | |
2138 | } | |
2139 | } | |
2aaef4e4 | 2140 | read_unlock(&net->packet.sklist_lock); |
1da177e4 LT |
2141 | return NOTIFY_DONE; |
2142 | } | |
2143 | ||
2144 | ||
2145 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
2146 | unsigned long arg) | |
2147 | { | |
2148 | struct sock *sk = sock->sk; | |
2149 | ||
69e3c75f | 2150 | switch (cmd) { |
40d4e3df ED |
2151 | case SIOCOUTQ: |
2152 | { | |
2153 | int amount = sk_wmem_alloc_get(sk); | |
31e6d363 | 2154 | |
40d4e3df ED |
2155 | return put_user(amount, (int __user *)arg); |
2156 | } | |
2157 | case SIOCINQ: | |
2158 | { | |
2159 | struct sk_buff *skb; | |
2160 | int amount = 0; | |
2161 | ||
2162 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
2163 | skb = skb_peek(&sk->sk_receive_queue); | |
2164 | if (skb) | |
2165 | amount = skb->len; | |
2166 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
2167 | return put_user(amount, (int __user *)arg); | |
2168 | } | |
2169 | case SIOCGSTAMP: | |
2170 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
2171 | case SIOCGSTAMPNS: | |
2172 | return sock_get_timestampns(sk, (struct timespec __user *)arg); | |
1ce4f28b | 2173 | |
1da177e4 | 2174 | #ifdef CONFIG_INET |
40d4e3df ED |
2175 | case SIOCADDRT: |
2176 | case SIOCDELRT: | |
2177 | case SIOCDARP: | |
2178 | case SIOCGARP: | |
2179 | case SIOCSARP: | |
2180 | case SIOCGIFADDR: | |
2181 | case SIOCSIFADDR: | |
2182 | case SIOCGIFBRDADDR: | |
2183 | case SIOCSIFBRDADDR: | |
2184 | case SIOCGIFNETMASK: | |
2185 | case SIOCSIFNETMASK: | |
2186 | case SIOCGIFDSTADDR: | |
2187 | case SIOCSIFDSTADDR: | |
2188 | case SIOCSIFFLAGS: | |
2189 | if (!net_eq(sock_net(sk), &init_net)) | |
2190 | return -ENOIOCTLCMD; | |
2191 | return inet_dgram_ops.ioctl(sock, cmd, arg); | |
1da177e4 LT |
2192 | #endif |
2193 | ||
40d4e3df ED |
2194 | default: |
2195 | return -ENOIOCTLCMD; | |
1da177e4 LT |
2196 | } |
2197 | return 0; | |
2198 | } | |
2199 | ||
2200 | #ifndef CONFIG_PACKET_MMAP | |
2201 | #define packet_mmap sock_no_mmap | |
2202 | #define packet_poll datagram_poll | |
2203 | #else | |
2204 | ||
40d4e3df | 2205 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
1da177e4 LT |
2206 | poll_table *wait) |
2207 | { | |
2208 | struct sock *sk = sock->sk; | |
2209 | struct packet_sock *po = pkt_sk(sk); | |
2210 | unsigned int mask = datagram_poll(file, sock, wait); | |
2211 | ||
2212 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2213 | if (po->rx_ring.pg_vec) { |
2214 | if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL)) | |
1da177e4 LT |
2215 | mask |= POLLIN | POLLRDNORM; |
2216 | } | |
2217 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2218 | spin_lock_bh(&sk->sk_write_queue.lock); |
2219 | if (po->tx_ring.pg_vec) { | |
2220 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) | |
2221 | mask |= POLLOUT | POLLWRNORM; | |
2222 | } | |
2223 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
1da177e4 LT |
2224 | return mask; |
2225 | } | |
2226 | ||
2227 | ||
2228 | /* Dirty? Well, I still did not learn better way to account | |
2229 | * for user mmaps. | |
2230 | */ | |
2231 | ||
2232 | static void packet_mm_open(struct vm_area_struct *vma) | |
2233 | { | |
2234 | struct file *file = vma->vm_file; | |
40d4e3df | 2235 | struct socket *sock = file->private_data; |
1da177e4 | 2236 | struct sock *sk = sock->sk; |
1ce4f28b | 2237 | |
1da177e4 LT |
2238 | if (sk) |
2239 | atomic_inc(&pkt_sk(sk)->mapped); | |
2240 | } | |
2241 | ||
2242 | static void packet_mm_close(struct vm_area_struct *vma) | |
2243 | { | |
2244 | struct file *file = vma->vm_file; | |
40d4e3df | 2245 | struct socket *sock = file->private_data; |
1da177e4 | 2246 | struct sock *sk = sock->sk; |
1ce4f28b | 2247 | |
1da177e4 LT |
2248 | if (sk) |
2249 | atomic_dec(&pkt_sk(sk)->mapped); | |
2250 | } | |
2251 | ||
f0f37e2f | 2252 | static const struct vm_operations_struct packet_mmap_ops = { |
40d4e3df ED |
2253 | .open = packet_mm_open, |
2254 | .close = packet_mm_close, | |
1da177e4 LT |
2255 | }; |
2256 | ||
4ebf0ae2 | 2257 | static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len) |
1da177e4 LT |
2258 | { |
2259 | int i; | |
2260 | ||
4ebf0ae2 DM |
2261 | for (i = 0; i < len; i++) { |
2262 | if (likely(pg_vec[i])) | |
2263 | free_pages((unsigned long) pg_vec[i], order); | |
1da177e4 LT |
2264 | } |
2265 | kfree(pg_vec); | |
2266 | } | |
2267 | ||
4ebf0ae2 DM |
2268 | static inline char *alloc_one_pg_vec_page(unsigned long order) |
2269 | { | |
719bfeaa ED |
2270 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN; |
2271 | ||
2272 | return (char *) __get_free_pages(gfp_flags, order); | |
4ebf0ae2 DM |
2273 | } |
2274 | ||
2275 | static char **alloc_pg_vec(struct tpacket_req *req, int order) | |
2276 | { | |
2277 | unsigned int block_nr = req->tp_block_nr; | |
2278 | char **pg_vec; | |
2279 | int i; | |
2280 | ||
2281 | pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL); | |
2282 | if (unlikely(!pg_vec)) | |
2283 | goto out; | |
2284 | ||
2285 | for (i = 0; i < block_nr; i++) { | |
2286 | pg_vec[i] = alloc_one_pg_vec_page(order); | |
2287 | if (unlikely(!pg_vec[i])) | |
2288 | goto out_free_pgvec; | |
2289 | } | |
2290 | ||
2291 | out: | |
2292 | return pg_vec; | |
2293 | ||
2294 | out_free_pgvec: | |
2295 | free_pg_vec(pg_vec, order, block_nr); | |
2296 | pg_vec = NULL; | |
2297 | goto out; | |
2298 | } | |
1da177e4 | 2299 | |
69e3c75f JB |
2300 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
2301 | int closing, int tx_ring) | |
1da177e4 LT |
2302 | { |
2303 | char **pg_vec = NULL; | |
2304 | struct packet_sock *po = pkt_sk(sk); | |
0e11c91e | 2305 | int was_running, order = 0; |
69e3c75f JB |
2306 | struct packet_ring_buffer *rb; |
2307 | struct sk_buff_head *rb_queue; | |
0e11c91e | 2308 | __be16 num; |
69e3c75f | 2309 | int err; |
1ce4f28b | 2310 | |
69e3c75f JB |
2311 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
2312 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; | |
1da177e4 | 2313 | |
69e3c75f JB |
2314 | err = -EBUSY; |
2315 | if (!closing) { | |
2316 | if (atomic_read(&po->mapped)) | |
2317 | goto out; | |
2318 | if (atomic_read(&rb->pending)) | |
2319 | goto out; | |
2320 | } | |
1da177e4 | 2321 | |
69e3c75f JB |
2322 | if (req->tp_block_nr) { |
2323 | /* Sanity tests and some calculations */ | |
2324 | err = -EBUSY; | |
2325 | if (unlikely(rb->pg_vec)) | |
2326 | goto out; | |
1da177e4 | 2327 | |
bbd6ef87 PM |
2328 | switch (po->tp_version) { |
2329 | case TPACKET_V1: | |
2330 | po->tp_hdrlen = TPACKET_HDRLEN; | |
2331 | break; | |
2332 | case TPACKET_V2: | |
2333 | po->tp_hdrlen = TPACKET2_HDRLEN; | |
2334 | break; | |
2335 | } | |
2336 | ||
69e3c75f | 2337 | err = -EINVAL; |
4ebf0ae2 | 2338 | if (unlikely((int)req->tp_block_size <= 0)) |
69e3c75f | 2339 | goto out; |
4ebf0ae2 | 2340 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
69e3c75f | 2341 | goto out; |
8913336a | 2342 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
69e3c75f JB |
2343 | po->tp_reserve)) |
2344 | goto out; | |
4ebf0ae2 | 2345 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
69e3c75f | 2346 | goto out; |
1da177e4 | 2347 | |
69e3c75f JB |
2348 | rb->frames_per_block = req->tp_block_size/req->tp_frame_size; |
2349 | if (unlikely(rb->frames_per_block <= 0)) | |
2350 | goto out; | |
2351 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != | |
2352 | req->tp_frame_nr)) | |
2353 | goto out; | |
1da177e4 LT |
2354 | |
2355 | err = -ENOMEM; | |
4ebf0ae2 DM |
2356 | order = get_order(req->tp_block_size); |
2357 | pg_vec = alloc_pg_vec(req, order); | |
2358 | if (unlikely(!pg_vec)) | |
1da177e4 | 2359 | goto out; |
69e3c75f JB |
2360 | } |
2361 | /* Done */ | |
2362 | else { | |
2363 | err = -EINVAL; | |
4ebf0ae2 | 2364 | if (unlikely(req->tp_frame_nr)) |
69e3c75f | 2365 | goto out; |
1da177e4 LT |
2366 | } |
2367 | ||
2368 | lock_sock(sk); | |
2369 | ||
2370 | /* Detach socket from network */ | |
2371 | spin_lock(&po->bind_lock); | |
2372 | was_running = po->running; | |
2373 | num = po->num; | |
2374 | if (was_running) { | |
2375 | __dev_remove_pack(&po->prot_hook); | |
2376 | po->num = 0; | |
2377 | po->running = 0; | |
2378 | __sock_put(sk); | |
2379 | } | |
2380 | spin_unlock(&po->bind_lock); | |
1ce4f28b | 2381 | |
1da177e4 LT |
2382 | synchronize_net(); |
2383 | ||
2384 | err = -EBUSY; | |
905db440 | 2385 | mutex_lock(&po->pg_vec_lock); |
1da177e4 LT |
2386 | if (closing || atomic_read(&po->mapped) == 0) { |
2387 | err = 0; | |
2388 | #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) | |
69e3c75f JB |
2389 | spin_lock_bh(&rb_queue->lock); |
2390 | pg_vec = XC(rb->pg_vec, pg_vec); | |
2391 | rb->frame_max = (req->tp_frame_nr - 1); | |
2392 | rb->head = 0; | |
2393 | rb->frame_size = req->tp_frame_size; | |
2394 | spin_unlock_bh(&rb_queue->lock); | |
2395 | ||
2396 | order = XC(rb->pg_vec_order, order); | |
2397 | req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr); | |
2398 | ||
2399 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
2400 | po->prot_hook.func = (po->rx_ring.pg_vec) ? | |
2401 | tpacket_rcv : packet_rcv; | |
2402 | skb_queue_purge(rb_queue); | |
1da177e4 LT |
2403 | #undef XC |
2404 | if (atomic_read(&po->mapped)) | |
40d4e3df ED |
2405 | pr_err("packet_mmap: vma is busy: %d\n", |
2406 | atomic_read(&po->mapped)); | |
1da177e4 | 2407 | } |
905db440 | 2408 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2409 | |
2410 | spin_lock(&po->bind_lock); | |
2411 | if (was_running && !po->running) { | |
2412 | sock_hold(sk); | |
2413 | po->running = 1; | |
2414 | po->num = num; | |
2415 | dev_add_pack(&po->prot_hook); | |
2416 | } | |
2417 | spin_unlock(&po->bind_lock); | |
2418 | ||
2419 | release_sock(sk); | |
2420 | ||
1da177e4 LT |
2421 | if (pg_vec) |
2422 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
2423 | out: | |
2424 | return err; | |
2425 | } | |
2426 | ||
69e3c75f JB |
2427 | static int packet_mmap(struct file *file, struct socket *sock, |
2428 | struct vm_area_struct *vma) | |
1da177e4 LT |
2429 | { |
2430 | struct sock *sk = sock->sk; | |
2431 | struct packet_sock *po = pkt_sk(sk); | |
69e3c75f JB |
2432 | unsigned long size, expected_size; |
2433 | struct packet_ring_buffer *rb; | |
1da177e4 LT |
2434 | unsigned long start; |
2435 | int err = -EINVAL; | |
2436 | int i; | |
2437 | ||
2438 | if (vma->vm_pgoff) | |
2439 | return -EINVAL; | |
2440 | ||
905db440 | 2441 | mutex_lock(&po->pg_vec_lock); |
69e3c75f JB |
2442 | |
2443 | expected_size = 0; | |
2444 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { | |
2445 | if (rb->pg_vec) { | |
2446 | expected_size += rb->pg_vec_len | |
2447 | * rb->pg_vec_pages | |
2448 | * PAGE_SIZE; | |
2449 | } | |
2450 | } | |
2451 | ||
2452 | if (expected_size == 0) | |
1da177e4 | 2453 | goto out; |
69e3c75f JB |
2454 | |
2455 | size = vma->vm_end - vma->vm_start; | |
2456 | if (size != expected_size) | |
1da177e4 LT |
2457 | goto out; |
2458 | ||
1da177e4 | 2459 | start = vma->vm_start; |
69e3c75f JB |
2460 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
2461 | if (rb->pg_vec == NULL) | |
2462 | continue; | |
2463 | ||
2464 | for (i = 0; i < rb->pg_vec_len; i++) { | |
2465 | struct page *page = virt_to_page(rb->pg_vec[i]); | |
2466 | int pg_num; | |
2467 | ||
2468 | for (pg_num = 0; pg_num < rb->pg_vec_pages; | |
40d4e3df | 2469 | pg_num++, page++) { |
69e3c75f JB |
2470 | err = vm_insert_page(vma, start, page); |
2471 | if (unlikely(err)) | |
2472 | goto out; | |
2473 | start += PAGE_SIZE; | |
2474 | } | |
4ebf0ae2 | 2475 | } |
1da177e4 | 2476 | } |
69e3c75f | 2477 | |
4ebf0ae2 | 2478 | atomic_inc(&po->mapped); |
1da177e4 LT |
2479 | vma->vm_ops = &packet_mmap_ops; |
2480 | err = 0; | |
2481 | ||
2482 | out: | |
905db440 | 2483 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2484 | return err; |
2485 | } | |
2486 | #endif | |
2487 | ||
2488 | ||
90ddc4f0 | 2489 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
2490 | .family = PF_PACKET, |
2491 | .owner = THIS_MODULE, | |
2492 | .release = packet_release, | |
2493 | .bind = packet_bind_spkt, | |
2494 | .connect = sock_no_connect, | |
2495 | .socketpair = sock_no_socketpair, | |
2496 | .accept = sock_no_accept, | |
2497 | .getname = packet_getname_spkt, | |
2498 | .poll = datagram_poll, | |
2499 | .ioctl = packet_ioctl, | |
2500 | .listen = sock_no_listen, | |
2501 | .shutdown = sock_no_shutdown, | |
2502 | .setsockopt = sock_no_setsockopt, | |
2503 | .getsockopt = sock_no_getsockopt, | |
2504 | .sendmsg = packet_sendmsg_spkt, | |
2505 | .recvmsg = packet_recvmsg, | |
2506 | .mmap = sock_no_mmap, | |
2507 | .sendpage = sock_no_sendpage, | |
2508 | }; | |
1da177e4 | 2509 | |
90ddc4f0 | 2510 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
2511 | .family = PF_PACKET, |
2512 | .owner = THIS_MODULE, | |
2513 | .release = packet_release, | |
2514 | .bind = packet_bind, | |
2515 | .connect = sock_no_connect, | |
2516 | .socketpair = sock_no_socketpair, | |
2517 | .accept = sock_no_accept, | |
1ce4f28b | 2518 | .getname = packet_getname, |
1da177e4 LT |
2519 | .poll = packet_poll, |
2520 | .ioctl = packet_ioctl, | |
2521 | .listen = sock_no_listen, | |
2522 | .shutdown = sock_no_shutdown, | |
2523 | .setsockopt = packet_setsockopt, | |
2524 | .getsockopt = packet_getsockopt, | |
2525 | .sendmsg = packet_sendmsg, | |
2526 | .recvmsg = packet_recvmsg, | |
2527 | .mmap = packet_mmap, | |
2528 | .sendpage = sock_no_sendpage, | |
2529 | }; | |
2530 | ||
ec1b4cf7 | 2531 | static const struct net_proto_family packet_family_ops = { |
1da177e4 LT |
2532 | .family = PF_PACKET, |
2533 | .create = packet_create, | |
2534 | .owner = THIS_MODULE, | |
2535 | }; | |
2536 | ||
2537 | static struct notifier_block packet_netdev_notifier = { | |
40d4e3df | 2538 | .notifier_call = packet_notifier, |
1da177e4 LT |
2539 | }; |
2540 | ||
2541 | #ifdef CONFIG_PROC_FS | |
d12d01d6 | 2542 | static inline struct sock *packet_seq_idx(struct net *net, loff_t off) |
1da177e4 LT |
2543 | { |
2544 | struct sock *s; | |
2545 | struct hlist_node *node; | |
2546 | ||
2aaef4e4 | 2547 | sk_for_each(s, node, &net->packet.sklist) { |
1da177e4 LT |
2548 | if (!off--) |
2549 | return s; | |
2550 | } | |
2551 | return NULL; | |
2552 | } | |
2553 | ||
2554 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
40ccbf52 | 2555 | __acquires(seq_file_net(seq)->packet.sklist_lock) |
1da177e4 | 2556 | { |
e372c414 | 2557 | struct net *net = seq_file_net(seq); |
2aaef4e4 | 2558 | read_lock(&net->packet.sklist_lock); |
d12d01d6 | 2559 | return *pos ? packet_seq_idx(net, *pos - 1) : SEQ_START_TOKEN; |
1da177e4 LT |
2560 | } |
2561 | ||
2562 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2563 | { | |
1bf40954 | 2564 | struct net *net = seq_file_net(seq); |
1da177e4 | 2565 | ++*pos; |
1ce4f28b | 2566 | return (v == SEQ_START_TOKEN) |
2aaef4e4 | 2567 | ? sk_head(&net->packet.sklist) |
40d4e3df | 2568 | : sk_next((struct sock *)v) ; |
1da177e4 LT |
2569 | } |
2570 | ||
2571 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
40ccbf52 | 2572 | __releases(seq_file_net(seq)->packet.sklist_lock) |
1da177e4 | 2573 | { |
1bf40954 | 2574 | struct net *net = seq_file_net(seq); |
2aaef4e4 | 2575 | read_unlock(&net->packet.sklist_lock); |
1da177e4 LT |
2576 | } |
2577 | ||
1ce4f28b | 2578 | static int packet_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
2579 | { |
2580 | if (v == SEQ_START_TOKEN) | |
2581 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
2582 | else { | |
2583 | struct sock *s = v; | |
2584 | const struct packet_sock *po = pkt_sk(s); | |
2585 | ||
2586 | seq_printf(seq, | |
2587 | "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", | |
2588 | s, | |
2589 | atomic_read(&s->sk_refcnt), | |
2590 | s->sk_type, | |
2591 | ntohs(po->num), | |
2592 | po->ifindex, | |
2593 | po->running, | |
2594 | atomic_read(&s->sk_rmem_alloc), | |
2595 | sock_i_uid(s), | |
40d4e3df | 2596 | sock_i_ino(s)); |
1da177e4 LT |
2597 | } |
2598 | ||
2599 | return 0; | |
2600 | } | |
2601 | ||
56b3d975 | 2602 | static const struct seq_operations packet_seq_ops = { |
1da177e4 LT |
2603 | .start = packet_seq_start, |
2604 | .next = packet_seq_next, | |
2605 | .stop = packet_seq_stop, | |
2606 | .show = packet_seq_show, | |
2607 | }; | |
2608 | ||
2609 | static int packet_seq_open(struct inode *inode, struct file *file) | |
2610 | { | |
e372c414 DL |
2611 | return seq_open_net(inode, file, &packet_seq_ops, |
2612 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2613 | } |
2614 | ||
da7071d7 | 2615 | static const struct file_operations packet_seq_fops = { |
1da177e4 LT |
2616 | .owner = THIS_MODULE, |
2617 | .open = packet_seq_open, | |
2618 | .read = seq_read, | |
2619 | .llseek = seq_lseek, | |
e372c414 | 2620 | .release = seq_release_net, |
1da177e4 LT |
2621 | }; |
2622 | ||
2623 | #endif | |
2624 | ||
2c8c1e72 | 2625 | static int __net_init packet_net_init(struct net *net) |
d12d01d6 | 2626 | { |
2aaef4e4 DL |
2627 | rwlock_init(&net->packet.sklist_lock); |
2628 | INIT_HLIST_HEAD(&net->packet.sklist); | |
d12d01d6 DL |
2629 | |
2630 | if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops)) | |
2631 | return -ENOMEM; | |
2632 | ||
2633 | return 0; | |
2634 | } | |
2635 | ||
2c8c1e72 | 2636 | static void __net_exit packet_net_exit(struct net *net) |
d12d01d6 DL |
2637 | { |
2638 | proc_net_remove(net, "packet"); | |
2639 | } | |
2640 | ||
2641 | static struct pernet_operations packet_net_ops = { | |
2642 | .init = packet_net_init, | |
2643 | .exit = packet_net_exit, | |
2644 | }; | |
2645 | ||
2646 | ||
1da177e4 LT |
2647 | static void __exit packet_exit(void) |
2648 | { | |
1da177e4 | 2649 | unregister_netdevice_notifier(&packet_netdev_notifier); |
d12d01d6 | 2650 | unregister_pernet_subsys(&packet_net_ops); |
1da177e4 LT |
2651 | sock_unregister(PF_PACKET); |
2652 | proto_unregister(&packet_proto); | |
2653 | } | |
2654 | ||
2655 | static int __init packet_init(void) | |
2656 | { | |
2657 | int rc = proto_register(&packet_proto, 0); | |
2658 | ||
2659 | if (rc != 0) | |
2660 | goto out; | |
2661 | ||
2662 | sock_register(&packet_family_ops); | |
d12d01d6 | 2663 | register_pernet_subsys(&packet_net_ops); |
1da177e4 | 2664 | register_netdevice_notifier(&packet_netdev_notifier); |
1da177e4 LT |
2665 | out: |
2666 | return rc; | |
2667 | } | |
2668 | ||
2669 | module_init(packet_init); | |
2670 | module_exit(packet_exit); | |
2671 | MODULE_LICENSE("GPL"); | |
2672 | MODULE_ALIAS_NETPROTO(PF_PACKET); |