]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * PACKET - implements raw packet sockets. | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
11 | * | |
1ce4f28b | 12 | * Fixes: |
1da177e4 LT |
13 | * Alan Cox : verify_area() now used correctly |
14 | * Alan Cox : new skbuff lists, look ma no backlogs! | |
15 | * Alan Cox : tidied skbuff lists. | |
16 | * Alan Cox : Now uses generic datagram routines I | |
17 | * added. Also fixed the peek/read crash | |
18 | * from all old Linux datagram code. | |
19 | * Alan Cox : Uses the improved datagram code. | |
20 | * Alan Cox : Added NULL's for socket options. | |
21 | * Alan Cox : Re-commented the code. | |
22 | * Alan Cox : Use new kernel side addressing | |
23 | * Rob Janssen : Correct MTU usage. | |
24 | * Dave Platt : Counter leaks caused by incorrect | |
25 | * interrupt locking and some slightly | |
26 | * dubious gcc output. Can you read | |
27 | * compiler: it said _VOLATILE_ | |
28 | * Richard Kooijman : Timestamp fixes. | |
29 | * Alan Cox : New buffers. Use sk->mac.raw. | |
30 | * Alan Cox : sendmsg/recvmsg support. | |
31 | * Alan Cox : Protocol setting support | |
32 | * Alexey Kuznetsov : Untied from IPv4 stack. | |
33 | * Cyrus Durgin : Fixed kerneld for kmod. | |
34 | * Michal Ostrowski : Module initialization cleanup. | |
1ce4f28b | 35 | * Ulises Alonso : Frame number limit removal and |
1da177e4 | 36 | * packet_set_ring memory leak. |
0fb375fb EB |
37 | * Eric Biederman : Allow for > 8 byte hardware addresses. |
38 | * The convention is that longer addresses | |
39 | * will simply extend the hardware address | |
1ce4f28b | 40 | * byte arrays at the end of sockaddr_ll |
0fb375fb | 41 | * and packet_mreq. |
69e3c75f | 42 | * Johann Baudy : Added TX RING. |
1da177e4 LT |
43 | * |
44 | * This program is free software; you can redistribute it and/or | |
45 | * modify it under the terms of the GNU General Public License | |
46 | * as published by the Free Software Foundation; either version | |
47 | * 2 of the License, or (at your option) any later version. | |
48 | * | |
49 | */ | |
1ce4f28b | 50 | |
1da177e4 | 51 | #include <linux/types.h> |
1da177e4 | 52 | #include <linux/mm.h> |
4fc268d2 | 53 | #include <linux/capability.h> |
1da177e4 LT |
54 | #include <linux/fcntl.h> |
55 | #include <linux/socket.h> | |
56 | #include <linux/in.h> | |
57 | #include <linux/inet.h> | |
58 | #include <linux/netdevice.h> | |
59 | #include <linux/if_packet.h> | |
60 | #include <linux/wireless.h> | |
ffbc6111 | 61 | #include <linux/kernel.h> |
1da177e4 | 62 | #include <linux/kmod.h> |
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> |
1da177e4 LT |
83 | |
84 | #ifdef CONFIG_INET | |
85 | #include <net/inet_common.h> | |
86 | #endif | |
87 | ||
1da177e4 LT |
88 | /* |
89 | Assumptions: | |
90 | - if device has no dev->hard_header routine, it adds and removes ll header | |
91 | inside itself. In this case ll header is invisible outside of device, | |
92 | but higher levels still should reserve dev->hard_header_len. | |
93 | Some devices are enough clever to reallocate skb, when header | |
94 | will not fit to reserved space (tunnel), another ones are silly | |
95 | (PPP). | |
96 | - packet socket receives packets with pulled ll header, | |
97 | so that SOCK_RAW should push it back. | |
98 | ||
99 | On receive: | |
100 | ----------- | |
101 | ||
102 | Incoming, dev->hard_header!=NULL | |
b0e380b1 ACM |
103 | mac_header -> ll header |
104 | data -> data | |
1da177e4 LT |
105 | |
106 | Outgoing, dev->hard_header!=NULL | |
b0e380b1 ACM |
107 | mac_header -> ll header |
108 | data -> ll header | |
1da177e4 LT |
109 | |
110 | Incoming, dev->hard_header==NULL | |
b0e380b1 ACM |
111 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
112 | header. PPP makes it, that is wrong, because introduce | |
db0c58f9 | 113 | assymetry between rx and tx paths. |
b0e380b1 | 114 | data -> data |
1da177e4 LT |
115 | |
116 | Outgoing, dev->hard_header==NULL | |
b0e380b1 ACM |
117 | mac_header -> data. ll header is still not built! |
118 | data -> data | |
1da177e4 LT |
119 | |
120 | Resume | |
121 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. | |
122 | ||
123 | ||
124 | On transmit: | |
125 | ------------ | |
126 | ||
127 | dev->hard_header != NULL | |
b0e380b1 ACM |
128 | mac_header -> ll header |
129 | data -> ll header | |
1da177e4 LT |
130 | |
131 | dev->hard_header == NULL (ll header is added by device, we cannot control it) | |
b0e380b1 ACM |
132 | mac_header -> data |
133 | data -> data | |
1da177e4 LT |
134 | |
135 | We should set nh.raw on output to correct posistion, | |
136 | packet classifier depends on it. | |
137 | */ | |
138 | ||
1da177e4 LT |
139 | /* Private packet socket structures. */ |
140 | ||
40d4e3df | 141 | struct packet_mclist { |
1da177e4 LT |
142 | struct packet_mclist *next; |
143 | int ifindex; | |
144 | int count; | |
145 | unsigned short type; | |
146 | unsigned short alen; | |
0fb375fb EB |
147 | unsigned char addr[MAX_ADDR_LEN]; |
148 | }; | |
149 | /* identical to struct packet_mreq except it has | |
150 | * a longer address field. | |
151 | */ | |
40d4e3df | 152 | struct packet_mreq_max { |
0fb375fb EB |
153 | int mr_ifindex; |
154 | unsigned short mr_type; | |
155 | unsigned short mr_alen; | |
156 | unsigned char mr_address[MAX_ADDR_LEN]; | |
1da177e4 | 157 | }; |
a2efcfa0 | 158 | |
1da177e4 | 159 | #ifdef CONFIG_PACKET_MMAP |
69e3c75f JB |
160 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
161 | int closing, int tx_ring); | |
162 | ||
163 | struct packet_ring_buffer { | |
40d4e3df | 164 | char **pg_vec; |
69e3c75f JB |
165 | unsigned int head; |
166 | unsigned int frames_per_block; | |
167 | unsigned int frame_size; | |
168 | unsigned int frame_max; | |
169 | ||
170 | unsigned int pg_vec_order; | |
171 | unsigned int pg_vec_pages; | |
172 | unsigned int pg_vec_len; | |
173 | ||
174 | atomic_t pending; | |
175 | }; | |
176 | ||
177 | struct packet_sock; | |
178 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg); | |
1da177e4 LT |
179 | #endif |
180 | ||
181 | static void packet_flush_mclist(struct sock *sk); | |
182 | ||
183 | struct packet_sock { | |
184 | /* struct sock has to be the first member of packet_sock */ | |
185 | struct sock sk; | |
186 | struct tpacket_stats stats; | |
187 | #ifdef CONFIG_PACKET_MMAP | |
69e3c75f JB |
188 | struct packet_ring_buffer rx_ring; |
189 | struct packet_ring_buffer tx_ring; | |
1da177e4 LT |
190 | int copy_thresh; |
191 | #endif | |
1da177e4 | 192 | spinlock_t bind_lock; |
905db440 | 193 | struct mutex pg_vec_lock; |
8dc41944 | 194 | unsigned int running:1, /* prot_hook is attached*/ |
80feaacb PWJ |
195 | auxdata:1, |
196 | origdev:1; | |
1da177e4 | 197 | int ifindex; /* bound device */ |
0e11c91e | 198 | __be16 num; |
1da177e4 | 199 | struct packet_mclist *mclist; |
1da177e4 LT |
200 | #ifdef CONFIG_PACKET_MMAP |
201 | atomic_t mapped; | |
bbd6ef87 PM |
202 | enum tpacket_versions tp_version; |
203 | unsigned int tp_hdrlen; | |
8913336a | 204 | unsigned int tp_reserve; |
69e3c75f | 205 | unsigned int tp_loss:1; |
1da177e4 | 206 | #endif |
94b05952 | 207 | struct packet_type prot_hook ____cacheline_aligned_in_smp; |
1da177e4 LT |
208 | }; |
209 | ||
ffbc6111 HX |
210 | struct packet_skb_cb { |
211 | unsigned int origlen; | |
212 | union { | |
213 | struct sockaddr_pkt pkt; | |
214 | struct sockaddr_ll ll; | |
215 | } sa; | |
216 | }; | |
217 | ||
218 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) | |
8dc41944 | 219 | |
1da177e4 LT |
220 | #ifdef CONFIG_PACKET_MMAP |
221 | ||
69e3c75f | 222 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
1da177e4 | 223 | { |
bbd6ef87 PM |
224 | union { |
225 | struct tpacket_hdr *h1; | |
226 | struct tpacket2_hdr *h2; | |
227 | void *raw; | |
228 | } h; | |
1da177e4 | 229 | |
69e3c75f | 230 | h.raw = frame; |
bbd6ef87 PM |
231 | switch (po->tp_version) { |
232 | case TPACKET_V1: | |
69e3c75f JB |
233 | h.h1->tp_status = status; |
234 | flush_dcache_page(virt_to_page(&h.h1->tp_status)); | |
bbd6ef87 PM |
235 | break; |
236 | case TPACKET_V2: | |
69e3c75f JB |
237 | h.h2->tp_status = status; |
238 | flush_dcache_page(virt_to_page(&h.h2->tp_status)); | |
bbd6ef87 | 239 | break; |
69e3c75f | 240 | default: |
40d4e3df | 241 | pr_err("TPACKET version not supported\n"); |
69e3c75f | 242 | BUG(); |
bbd6ef87 | 243 | } |
69e3c75f JB |
244 | |
245 | smp_wmb(); | |
bbd6ef87 PM |
246 | } |
247 | ||
69e3c75f | 248 | static int __packet_get_status(struct packet_sock *po, void *frame) |
bbd6ef87 PM |
249 | { |
250 | union { | |
251 | struct tpacket_hdr *h1; | |
252 | struct tpacket2_hdr *h2; | |
253 | void *raw; | |
254 | } h; | |
255 | ||
69e3c75f JB |
256 | smp_rmb(); |
257 | ||
bbd6ef87 PM |
258 | h.raw = frame; |
259 | switch (po->tp_version) { | |
260 | case TPACKET_V1: | |
69e3c75f JB |
261 | flush_dcache_page(virt_to_page(&h.h1->tp_status)); |
262 | return h.h1->tp_status; | |
bbd6ef87 | 263 | case TPACKET_V2: |
69e3c75f JB |
264 | flush_dcache_page(virt_to_page(&h.h2->tp_status)); |
265 | return h.h2->tp_status; | |
266 | default: | |
40d4e3df | 267 | pr_err("TPACKET version not supported\n"); |
69e3c75f JB |
268 | BUG(); |
269 | return 0; | |
bbd6ef87 | 270 | } |
1da177e4 | 271 | } |
69e3c75f JB |
272 | |
273 | static void *packet_lookup_frame(struct packet_sock *po, | |
274 | struct packet_ring_buffer *rb, | |
275 | unsigned int position, | |
276 | int status) | |
277 | { | |
278 | unsigned int pg_vec_pos, frame_offset; | |
279 | union { | |
280 | struct tpacket_hdr *h1; | |
281 | struct tpacket2_hdr *h2; | |
282 | void *raw; | |
283 | } h; | |
284 | ||
285 | pg_vec_pos = position / rb->frames_per_block; | |
286 | frame_offset = position % rb->frames_per_block; | |
287 | ||
288 | h.raw = rb->pg_vec[pg_vec_pos] + (frame_offset * rb->frame_size); | |
289 | ||
290 | if (status != __packet_get_status(po, h.raw)) | |
291 | return NULL; | |
292 | ||
293 | return h.raw; | |
294 | } | |
295 | ||
296 | static inline void *packet_current_frame(struct packet_sock *po, | |
297 | struct packet_ring_buffer *rb, | |
298 | int status) | |
299 | { | |
300 | return packet_lookup_frame(po, rb, rb->head, status); | |
301 | } | |
302 | ||
303 | static inline void *packet_previous_frame(struct packet_sock *po, | |
304 | struct packet_ring_buffer *rb, | |
305 | int status) | |
306 | { | |
307 | unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; | |
308 | return packet_lookup_frame(po, rb, previous, status); | |
309 | } | |
310 | ||
311 | static inline void packet_increment_head(struct packet_ring_buffer *buff) | |
312 | { | |
313 | buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; | |
314 | } | |
315 | ||
1da177e4 LT |
316 | #endif |
317 | ||
318 | static inline struct packet_sock *pkt_sk(struct sock *sk) | |
319 | { | |
320 | return (struct packet_sock *)sk; | |
321 | } | |
322 | ||
323 | static void packet_sock_destruct(struct sock *sk) | |
324 | { | |
547b792c IJ |
325 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
326 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); | |
1da177e4 LT |
327 | |
328 | if (!sock_flag(sk, SOCK_DEAD)) { | |
40d4e3df | 329 | pr_err("Attempt to release alive packet socket: %p\n", sk); |
1da177e4 LT |
330 | return; |
331 | } | |
332 | ||
17ab56a2 | 333 | sk_refcnt_debug_dec(sk); |
1da177e4 LT |
334 | } |
335 | ||
336 | ||
90ddc4f0 | 337 | static const struct proto_ops packet_ops; |
1da177e4 | 338 | |
90ddc4f0 | 339 | static const struct proto_ops packet_ops_spkt; |
1da177e4 | 340 | |
40d4e3df ED |
341 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
342 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
343 | { |
344 | struct sock *sk; | |
345 | struct sockaddr_pkt *spkt; | |
346 | ||
347 | /* | |
348 | * When we registered the protocol we saved the socket in the data | |
349 | * field for just this event. | |
350 | */ | |
351 | ||
352 | sk = pt->af_packet_priv; | |
1ce4f28b | 353 | |
1da177e4 LT |
354 | /* |
355 | * Yank back the headers [hope the device set this | |
356 | * right or kerboom...] | |
357 | * | |
358 | * Incoming packets have ll header pulled, | |
359 | * push it back. | |
360 | * | |
98e399f8 | 361 | * For outgoing ones skb->data == skb_mac_header(skb) |
1da177e4 LT |
362 | * so that this procedure is noop. |
363 | */ | |
364 | ||
365 | if (skb->pkt_type == PACKET_LOOPBACK) | |
366 | goto out; | |
367 | ||
09ad9bc7 | 368 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
369 | goto out; |
370 | ||
40d4e3df ED |
371 | skb = skb_share_check(skb, GFP_ATOMIC); |
372 | if (skb == NULL) | |
1da177e4 LT |
373 | goto oom; |
374 | ||
375 | /* drop any routing info */ | |
adf30907 | 376 | skb_dst_drop(skb); |
1da177e4 | 377 | |
84531c24 PO |
378 | /* drop conntrack reference */ |
379 | nf_reset(skb); | |
380 | ||
ffbc6111 | 381 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
1da177e4 | 382 | |
98e399f8 | 383 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
384 | |
385 | /* | |
386 | * The SOCK_PACKET socket receives _all_ frames. | |
387 | */ | |
388 | ||
389 | spkt->spkt_family = dev->type; | |
390 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
391 | spkt->spkt_protocol = skb->protocol; | |
392 | ||
393 | /* | |
394 | * Charge the memory to the socket. This is done specifically | |
395 | * to prevent sockets using all the memory up. | |
396 | */ | |
397 | ||
40d4e3df | 398 | if (sock_queue_rcv_skb(sk, skb) == 0) |
1da177e4 LT |
399 | return 0; |
400 | ||
401 | out: | |
402 | kfree_skb(skb); | |
403 | oom: | |
404 | return 0; | |
405 | } | |
406 | ||
407 | ||
408 | /* | |
409 | * Output a raw packet to a device layer. This bypasses all the other | |
410 | * protocol layers and you must therefore supply it with a complete frame | |
411 | */ | |
1ce4f28b | 412 | |
1da177e4 LT |
413 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, |
414 | struct msghdr *msg, size_t len) | |
415 | { | |
416 | struct sock *sk = sock->sk; | |
40d4e3df | 417 | struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name; |
1a35ca80 | 418 | struct sk_buff *skb = NULL; |
1da177e4 | 419 | struct net_device *dev; |
40d4e3df | 420 | __be16 proto = 0; |
1da177e4 | 421 | int err; |
1ce4f28b | 422 | |
1da177e4 | 423 | /* |
1ce4f28b | 424 | * Get and verify the address. |
1da177e4 LT |
425 | */ |
426 | ||
40d4e3df | 427 | if (saddr) { |
1da177e4 | 428 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
40d4e3df ED |
429 | return -EINVAL; |
430 | if (msg->msg_namelen == sizeof(struct sockaddr_pkt)) | |
431 | proto = saddr->spkt_protocol; | |
432 | } else | |
433 | return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */ | |
1da177e4 LT |
434 | |
435 | /* | |
1ce4f28b | 436 | * Find the device first to size check it |
1da177e4 LT |
437 | */ |
438 | ||
439 | saddr->spkt_device[13] = 0; | |
1a35ca80 | 440 | retry: |
654d1f8a ED |
441 | rcu_read_lock(); |
442 | dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); | |
1da177e4 LT |
443 | err = -ENODEV; |
444 | if (dev == NULL) | |
445 | goto out_unlock; | |
1ce4f28b | 446 | |
d5e76b0a DM |
447 | err = -ENETDOWN; |
448 | if (!(dev->flags & IFF_UP)) | |
449 | goto out_unlock; | |
450 | ||
1da177e4 | 451 | /* |
40d4e3df ED |
452 | * You may not queue a frame bigger than the mtu. This is the lowest level |
453 | * raw protocol and you must do your own fragmentation at this level. | |
1da177e4 | 454 | */ |
1ce4f28b | 455 | |
1da177e4 | 456 | err = -EMSGSIZE; |
8ae55f04 | 457 | if (len > dev->mtu + dev->hard_header_len) |
1da177e4 LT |
458 | goto out_unlock; |
459 | ||
1a35ca80 ED |
460 | if (!skb) { |
461 | size_t reserved = LL_RESERVED_SPACE(dev); | |
462 | unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0; | |
463 | ||
464 | rcu_read_unlock(); | |
465 | skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL); | |
466 | if (skb == NULL) | |
467 | return -ENOBUFS; | |
468 | /* FIXME: Save some space for broken drivers that write a hard | |
469 | * header at transmission time by themselves. PPP is the notable | |
470 | * one here. This should really be fixed at the driver level. | |
471 | */ | |
472 | skb_reserve(skb, reserved); | |
473 | skb_reset_network_header(skb); | |
474 | ||
475 | /* Try to align data part correctly */ | |
476 | if (hhlen) { | |
477 | skb->data -= hhlen; | |
478 | skb->tail -= hhlen; | |
479 | if (len < hhlen) | |
480 | skb_reset_network_header(skb); | |
481 | } | |
482 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
483 | if (err) | |
484 | goto out_free; | |
485 | goto retry; | |
1da177e4 LT |
486 | } |
487 | ||
1a35ca80 | 488 | |
1da177e4 LT |
489 | skb->protocol = proto; |
490 | skb->dev = dev; | |
491 | skb->priority = sk->sk_priority; | |
2d37a186 | 492 | skb->mark = sk->sk_mark; |
1da177e4 LT |
493 | |
494 | dev_queue_xmit(skb); | |
654d1f8a | 495 | rcu_read_unlock(); |
40d4e3df | 496 | return len; |
1da177e4 | 497 | |
1da177e4 | 498 | out_unlock: |
654d1f8a | 499 | rcu_read_unlock(); |
1a35ca80 ED |
500 | out_free: |
501 | kfree_skb(skb); | |
1da177e4 LT |
502 | return err; |
503 | } | |
1da177e4 | 504 | |
dbcb5855 DM |
505 | static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk, |
506 | unsigned int res) | |
1da177e4 LT |
507 | { |
508 | struct sk_filter *filter; | |
fda9ef5d DM |
509 | |
510 | rcu_read_lock_bh(); | |
511 | filter = rcu_dereference(sk->sk_filter); | |
dbcb5855 DM |
512 | if (filter != NULL) |
513 | res = sk_run_filter(skb, filter->insns, filter->len); | |
fda9ef5d | 514 | rcu_read_unlock_bh(); |
1da177e4 | 515 | |
dbcb5855 | 516 | return res; |
1da177e4 LT |
517 | } |
518 | ||
519 | /* | |
520 | This function makes lazy skb cloning in hope that most of packets | |
521 | are discarded by BPF. | |
522 | ||
523 | Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
524 | and skb->cb are mangled. It works because (and until) packets | |
525 | falling here are owned by current CPU. Output packets are cloned | |
526 | by dev_queue_xmit_nit(), input packets are processed by net_bh | |
527 | sequencially, so that if we return skb to original state on exit, | |
528 | we will not harm anyone. | |
529 | */ | |
530 | ||
40d4e3df ED |
531 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
532 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
533 | { |
534 | struct sock *sk; | |
535 | struct sockaddr_ll *sll; | |
536 | struct packet_sock *po; | |
40d4e3df | 537 | u8 *skb_head = skb->data; |
1da177e4 | 538 | int skb_len = skb->len; |
dbcb5855 | 539 | unsigned int snaplen, res; |
1da177e4 LT |
540 | |
541 | if (skb->pkt_type == PACKET_LOOPBACK) | |
542 | goto drop; | |
543 | ||
544 | sk = pt->af_packet_priv; | |
545 | po = pkt_sk(sk); | |
546 | ||
09ad9bc7 | 547 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
548 | goto drop; |
549 | ||
1da177e4 LT |
550 | skb->dev = dev; |
551 | ||
3b04ddde | 552 | if (dev->header_ops) { |
1da177e4 LT |
553 | /* The device has an explicit notion of ll header, |
554 | exported to higher levels. | |
555 | ||
556 | Otherwise, the device hides datails of it frame | |
557 | structure, so that corresponding packet head | |
558 | never delivered to user. | |
559 | */ | |
560 | if (sk->sk_type != SOCK_DGRAM) | |
98e399f8 | 561 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
562 | else if (skb->pkt_type == PACKET_OUTGOING) { |
563 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 564 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
565 | } |
566 | } | |
567 | ||
568 | snaplen = skb->len; | |
569 | ||
dbcb5855 DM |
570 | res = run_filter(skb, sk, snaplen); |
571 | if (!res) | |
fda9ef5d | 572 | goto drop_n_restore; |
dbcb5855 DM |
573 | if (snaplen > res) |
574 | snaplen = res; | |
1da177e4 LT |
575 | |
576 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
577 | (unsigned)sk->sk_rcvbuf) | |
578 | goto drop_n_acct; | |
579 | ||
580 | if (skb_shared(skb)) { | |
581 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
582 | if (nskb == NULL) | |
583 | goto drop_n_acct; | |
584 | ||
585 | if (skb_head != skb->data) { | |
586 | skb->data = skb_head; | |
587 | skb->len = skb_len; | |
588 | } | |
589 | kfree_skb(skb); | |
590 | skb = nskb; | |
591 | } | |
592 | ||
ffbc6111 HX |
593 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
594 | sizeof(skb->cb)); | |
595 | ||
596 | sll = &PACKET_SKB_CB(skb)->sa.ll; | |
1da177e4 LT |
597 | sll->sll_family = AF_PACKET; |
598 | sll->sll_hatype = dev->type; | |
599 | sll->sll_protocol = skb->protocol; | |
600 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 601 | if (unlikely(po->origdev)) |
80feaacb PWJ |
602 | sll->sll_ifindex = orig_dev->ifindex; |
603 | else | |
604 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 605 | |
b95cce35 | 606 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 | 607 | |
ffbc6111 | 608 | PACKET_SKB_CB(skb)->origlen = skb->len; |
8dc41944 | 609 | |
1da177e4 LT |
610 | if (pskb_trim(skb, snaplen)) |
611 | goto drop_n_acct; | |
612 | ||
613 | skb_set_owner_r(skb, sk); | |
614 | skb->dev = NULL; | |
adf30907 | 615 | skb_dst_drop(skb); |
1da177e4 | 616 | |
84531c24 PO |
617 | /* drop conntrack reference */ |
618 | nf_reset(skb); | |
619 | ||
1da177e4 LT |
620 | spin_lock(&sk->sk_receive_queue.lock); |
621 | po->stats.tp_packets++; | |
3b885787 | 622 | skb->dropcount = atomic_read(&sk->sk_drops); |
1da177e4 LT |
623 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
624 | spin_unlock(&sk->sk_receive_queue.lock); | |
625 | sk->sk_data_ready(sk, skb->len); | |
626 | return 0; | |
627 | ||
628 | drop_n_acct: | |
3b885787 | 629 | po->stats.tp_drops = atomic_inc_return(&sk->sk_drops); |
1da177e4 LT |
630 | |
631 | drop_n_restore: | |
632 | if (skb_head != skb->data && skb_shared(skb)) { | |
633 | skb->data = skb_head; | |
634 | skb->len = skb_len; | |
635 | } | |
636 | drop: | |
ead2ceb0 | 637 | consume_skb(skb); |
1da177e4 LT |
638 | return 0; |
639 | } | |
640 | ||
641 | #ifdef CONFIG_PACKET_MMAP | |
40d4e3df ED |
642 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
643 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
644 | { |
645 | struct sock *sk; | |
646 | struct packet_sock *po; | |
647 | struct sockaddr_ll *sll; | |
bbd6ef87 PM |
648 | union { |
649 | struct tpacket_hdr *h1; | |
650 | struct tpacket2_hdr *h2; | |
651 | void *raw; | |
652 | } h; | |
40d4e3df | 653 | u8 *skb_head = skb->data; |
1da177e4 | 654 | int skb_len = skb->len; |
dbcb5855 | 655 | unsigned int snaplen, res; |
1da177e4 | 656 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
bbd6ef87 | 657 | unsigned short macoff, netoff, hdrlen; |
1da177e4 | 658 | struct sk_buff *copy_skb = NULL; |
b7aa0bf7 | 659 | struct timeval tv; |
bbd6ef87 | 660 | struct timespec ts; |
1da177e4 LT |
661 | |
662 | if (skb->pkt_type == PACKET_LOOPBACK) | |
663 | goto drop; | |
664 | ||
665 | sk = pt->af_packet_priv; | |
666 | po = pkt_sk(sk); | |
667 | ||
09ad9bc7 | 668 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
669 | goto drop; |
670 | ||
3b04ddde | 671 | if (dev->header_ops) { |
1da177e4 | 672 | if (sk->sk_type != SOCK_DGRAM) |
98e399f8 | 673 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
674 | else if (skb->pkt_type == PACKET_OUTGOING) { |
675 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 676 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
677 | } |
678 | } | |
679 | ||
8dc41944 HX |
680 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
681 | status |= TP_STATUS_CSUMNOTREADY; | |
682 | ||
1da177e4 LT |
683 | snaplen = skb->len; |
684 | ||
dbcb5855 DM |
685 | res = run_filter(skb, sk, snaplen); |
686 | if (!res) | |
fda9ef5d | 687 | goto drop_n_restore; |
dbcb5855 DM |
688 | if (snaplen > res) |
689 | snaplen = res; | |
1da177e4 LT |
690 | |
691 | if (sk->sk_type == SOCK_DGRAM) { | |
8913336a PM |
692 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
693 | po->tp_reserve; | |
1da177e4 | 694 | } else { |
bbe735e4 | 695 | unsigned maclen = skb_network_offset(skb); |
bbd6ef87 | 696 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
8913336a PM |
697 | (maclen < 16 ? 16 : maclen)) + |
698 | po->tp_reserve; | |
1da177e4 LT |
699 | macoff = netoff - maclen; |
700 | } | |
701 | ||
69e3c75f | 702 | if (macoff + snaplen > po->rx_ring.frame_size) { |
1da177e4 LT |
703 | if (po->copy_thresh && |
704 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < | |
705 | (unsigned)sk->sk_rcvbuf) { | |
706 | if (skb_shared(skb)) { | |
707 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
708 | } else { | |
709 | copy_skb = skb_get(skb); | |
710 | skb_head = skb->data; | |
711 | } | |
712 | if (copy_skb) | |
713 | skb_set_owner_r(copy_skb, sk); | |
714 | } | |
69e3c75f | 715 | snaplen = po->rx_ring.frame_size - macoff; |
1da177e4 LT |
716 | if ((int)snaplen < 0) |
717 | snaplen = 0; | |
718 | } | |
1da177e4 LT |
719 | |
720 | spin_lock(&sk->sk_receive_queue.lock); | |
69e3c75f | 721 | h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL); |
bbd6ef87 | 722 | if (!h.raw) |
1da177e4 | 723 | goto ring_is_full; |
69e3c75f | 724 | packet_increment_head(&po->rx_ring); |
1da177e4 LT |
725 | po->stats.tp_packets++; |
726 | if (copy_skb) { | |
727 | status |= TP_STATUS_COPY; | |
728 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
729 | } | |
730 | if (!po->stats.tp_drops) | |
731 | status &= ~TP_STATUS_LOSING; | |
732 | spin_unlock(&sk->sk_receive_queue.lock); | |
733 | ||
bbd6ef87 | 734 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
1da177e4 | 735 | |
bbd6ef87 PM |
736 | switch (po->tp_version) { |
737 | case TPACKET_V1: | |
738 | h.h1->tp_len = skb->len; | |
739 | h.h1->tp_snaplen = snaplen; | |
740 | h.h1->tp_mac = macoff; | |
741 | h.h1->tp_net = netoff; | |
742 | if (skb->tstamp.tv64) | |
743 | tv = ktime_to_timeval(skb->tstamp); | |
744 | else | |
745 | do_gettimeofday(&tv); | |
746 | h.h1->tp_sec = tv.tv_sec; | |
747 | h.h1->tp_usec = tv.tv_usec; | |
748 | hdrlen = sizeof(*h.h1); | |
749 | break; | |
750 | case TPACKET_V2: | |
751 | h.h2->tp_len = skb->len; | |
752 | h.h2->tp_snaplen = snaplen; | |
753 | h.h2->tp_mac = macoff; | |
754 | h.h2->tp_net = netoff; | |
755 | if (skb->tstamp.tv64) | |
756 | ts = ktime_to_timespec(skb->tstamp); | |
757 | else | |
758 | getnstimeofday(&ts); | |
759 | h.h2->tp_sec = ts.tv_sec; | |
760 | h.h2->tp_nsec = ts.tv_nsec; | |
05423b24 | 761 | h.h2->tp_vlan_tci = vlan_tx_tag_get(skb); |
bbd6ef87 PM |
762 | hdrlen = sizeof(*h.h2); |
763 | break; | |
764 | default: | |
765 | BUG(); | |
766 | } | |
1da177e4 | 767 | |
bbd6ef87 | 768 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
b95cce35 | 769 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 LT |
770 | sll->sll_family = AF_PACKET; |
771 | sll->sll_hatype = dev->type; | |
772 | sll->sll_protocol = skb->protocol; | |
773 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 774 | if (unlikely(po->origdev)) |
80feaacb PWJ |
775 | sll->sll_ifindex = orig_dev->ifindex; |
776 | else | |
777 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 778 | |
bbd6ef87 | 779 | __packet_set_status(po, h.raw, status); |
e16aa207 | 780 | smp_mb(); |
1da177e4 LT |
781 | { |
782 | struct page *p_start, *p_end; | |
bbd6ef87 | 783 | u8 *h_end = h.raw + macoff + snaplen - 1; |
1da177e4 | 784 | |
bbd6ef87 | 785 | p_start = virt_to_page(h.raw); |
1da177e4 LT |
786 | p_end = virt_to_page(h_end); |
787 | while (p_start <= p_end) { | |
788 | flush_dcache_page(p_start); | |
789 | p_start++; | |
790 | } | |
791 | } | |
792 | ||
793 | sk->sk_data_ready(sk, 0); | |
794 | ||
795 | drop_n_restore: | |
796 | if (skb_head != skb->data && skb_shared(skb)) { | |
797 | skb->data = skb_head; | |
798 | skb->len = skb_len; | |
799 | } | |
800 | drop: | |
1ce4f28b | 801 | kfree_skb(skb); |
1da177e4 LT |
802 | return 0; |
803 | ||
804 | ring_is_full: | |
805 | po->stats.tp_drops++; | |
806 | spin_unlock(&sk->sk_receive_queue.lock); | |
807 | ||
808 | sk->sk_data_ready(sk, 0); | |
acb5d75b | 809 | kfree_skb(copy_skb); |
1da177e4 LT |
810 | goto drop_n_restore; |
811 | } | |
812 | ||
69e3c75f JB |
813 | static void tpacket_destruct_skb(struct sk_buff *skb) |
814 | { | |
815 | struct packet_sock *po = pkt_sk(skb->sk); | |
40d4e3df | 816 | void *ph; |
1da177e4 | 817 | |
69e3c75f | 818 | BUG_ON(skb == NULL); |
1da177e4 | 819 | |
69e3c75f JB |
820 | if (likely(po->tx_ring.pg_vec)) { |
821 | ph = skb_shinfo(skb)->destructor_arg; | |
822 | BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING); | |
823 | BUG_ON(atomic_read(&po->tx_ring.pending) == 0); | |
824 | atomic_dec(&po->tx_ring.pending); | |
825 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE); | |
826 | } | |
827 | ||
828 | sock_wfree(skb); | |
829 | } | |
830 | ||
40d4e3df ED |
831 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
832 | void *frame, struct net_device *dev, int size_max, | |
833 | __be16 proto, unsigned char *addr) | |
69e3c75f JB |
834 | { |
835 | union { | |
836 | struct tpacket_hdr *h1; | |
837 | struct tpacket2_hdr *h2; | |
838 | void *raw; | |
839 | } ph; | |
840 | int to_write, offset, len, tp_len, nr_frags, len_max; | |
841 | struct socket *sock = po->sk.sk_socket; | |
842 | struct page *page; | |
843 | void *data; | |
844 | int err; | |
845 | ||
846 | ph.raw = frame; | |
847 | ||
848 | skb->protocol = proto; | |
849 | skb->dev = dev; | |
850 | skb->priority = po->sk.sk_priority; | |
2d37a186 | 851 | skb->mark = po->sk.sk_mark; |
69e3c75f JB |
852 | skb_shinfo(skb)->destructor_arg = ph.raw; |
853 | ||
854 | switch (po->tp_version) { | |
855 | case TPACKET_V2: | |
856 | tp_len = ph.h2->tp_len; | |
857 | break; | |
858 | default: | |
859 | tp_len = ph.h1->tp_len; | |
860 | break; | |
861 | } | |
862 | if (unlikely(tp_len > size_max)) { | |
40d4e3df | 863 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); |
69e3c75f JB |
864 | return -EMSGSIZE; |
865 | } | |
866 | ||
867 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
868 | skb_reset_network_header(skb); | |
869 | ||
870 | data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll); | |
871 | to_write = tp_len; | |
872 | ||
873 | if (sock->type == SOCK_DGRAM) { | |
874 | err = dev_hard_header(skb, dev, ntohs(proto), addr, | |
875 | NULL, tp_len); | |
876 | if (unlikely(err < 0)) | |
877 | return -EINVAL; | |
40d4e3df | 878 | } else if (dev->hard_header_len) { |
69e3c75f JB |
879 | /* net device doesn't like empty head */ |
880 | if (unlikely(tp_len <= dev->hard_header_len)) { | |
40d4e3df ED |
881 | pr_err("packet size is too short (%d < %d)\n", |
882 | tp_len, dev->hard_header_len); | |
69e3c75f JB |
883 | return -EINVAL; |
884 | } | |
885 | ||
886 | skb_push(skb, dev->hard_header_len); | |
887 | err = skb_store_bits(skb, 0, data, | |
888 | dev->hard_header_len); | |
889 | if (unlikely(err)) | |
890 | return err; | |
891 | ||
892 | data += dev->hard_header_len; | |
893 | to_write -= dev->hard_header_len; | |
894 | } | |
895 | ||
896 | err = -EFAULT; | |
897 | page = virt_to_page(data); | |
898 | offset = offset_in_page(data); | |
899 | len_max = PAGE_SIZE - offset; | |
900 | len = ((to_write > len_max) ? len_max : to_write); | |
901 | ||
902 | skb->data_len = to_write; | |
903 | skb->len += to_write; | |
904 | skb->truesize += to_write; | |
905 | atomic_add(to_write, &po->sk.sk_wmem_alloc); | |
906 | ||
907 | while (likely(to_write)) { | |
908 | nr_frags = skb_shinfo(skb)->nr_frags; | |
909 | ||
910 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { | |
40d4e3df ED |
911 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
912 | MAX_SKB_FRAGS); | |
69e3c75f JB |
913 | return -EFAULT; |
914 | } | |
915 | ||
916 | flush_dcache_page(page); | |
917 | get_page(page); | |
918 | skb_fill_page_desc(skb, | |
919 | nr_frags, | |
920 | page++, offset, len); | |
921 | to_write -= len; | |
922 | offset = 0; | |
923 | len_max = PAGE_SIZE; | |
924 | len = ((to_write > len_max) ? len_max : to_write); | |
925 | } | |
926 | ||
927 | return tp_len; | |
928 | } | |
929 | ||
930 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) | |
931 | { | |
932 | struct socket *sock; | |
933 | struct sk_buff *skb; | |
934 | struct net_device *dev; | |
935 | __be16 proto; | |
936 | int ifindex, err, reserve = 0; | |
40d4e3df ED |
937 | void *ph; |
938 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; | |
69e3c75f JB |
939 | int tp_len, size_max; |
940 | unsigned char *addr; | |
941 | int len_sum = 0; | |
942 | int status = 0; | |
943 | ||
944 | sock = po->sk.sk_socket; | |
945 | ||
946 | mutex_lock(&po->pg_vec_lock); | |
947 | ||
948 | err = -EBUSY; | |
949 | if (saddr == NULL) { | |
950 | ifindex = po->ifindex; | |
951 | proto = po->num; | |
952 | addr = NULL; | |
953 | } else { | |
954 | err = -EINVAL; | |
955 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
956 | goto out; | |
957 | if (msg->msg_namelen < (saddr->sll_halen | |
958 | + offsetof(struct sockaddr_ll, | |
959 | sll_addr))) | |
960 | goto out; | |
961 | ifindex = saddr->sll_ifindex; | |
962 | proto = saddr->sll_protocol; | |
963 | addr = saddr->sll_addr; | |
964 | } | |
965 | ||
966 | dev = dev_get_by_index(sock_net(&po->sk), ifindex); | |
967 | err = -ENXIO; | |
968 | if (unlikely(dev == NULL)) | |
969 | goto out; | |
970 | ||
971 | reserve = dev->hard_header_len; | |
972 | ||
973 | err = -ENETDOWN; | |
974 | if (unlikely(!(dev->flags & IFF_UP))) | |
975 | goto out_put; | |
976 | ||
977 | size_max = po->tx_ring.frame_size | |
b5dd884e | 978 | - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
69e3c75f JB |
979 | |
980 | if (size_max > dev->mtu + reserve) | |
981 | size_max = dev->mtu + reserve; | |
982 | ||
983 | do { | |
984 | ph = packet_current_frame(po, &po->tx_ring, | |
985 | TP_STATUS_SEND_REQUEST); | |
986 | ||
987 | if (unlikely(ph == NULL)) { | |
988 | schedule(); | |
989 | continue; | |
990 | } | |
991 | ||
992 | status = TP_STATUS_SEND_REQUEST; | |
993 | skb = sock_alloc_send_skb(&po->sk, | |
994 | LL_ALLOCATED_SPACE(dev) | |
995 | + sizeof(struct sockaddr_ll), | |
996 | 0, &err); | |
997 | ||
998 | if (unlikely(skb == NULL)) | |
999 | goto out_status; | |
1000 | ||
1001 | tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto, | |
1002 | addr); | |
1003 | ||
1004 | if (unlikely(tp_len < 0)) { | |
1005 | if (po->tp_loss) { | |
1006 | __packet_set_status(po, ph, | |
1007 | TP_STATUS_AVAILABLE); | |
1008 | packet_increment_head(&po->tx_ring); | |
1009 | kfree_skb(skb); | |
1010 | continue; | |
1011 | } else { | |
1012 | status = TP_STATUS_WRONG_FORMAT; | |
1013 | err = tp_len; | |
1014 | goto out_status; | |
1015 | } | |
1016 | } | |
1017 | ||
1018 | skb->destructor = tpacket_destruct_skb; | |
1019 | __packet_set_status(po, ph, TP_STATUS_SENDING); | |
1020 | atomic_inc(&po->tx_ring.pending); | |
1021 | ||
1022 | status = TP_STATUS_SEND_REQUEST; | |
1023 | err = dev_queue_xmit(skb); | |
1024 | if (unlikely(err > 0 && (err = net_xmit_errno(err)) != 0)) | |
1025 | goto out_xmit; | |
1026 | packet_increment_head(&po->tx_ring); | |
1027 | len_sum += tp_len; | |
f64f9e71 JP |
1028 | } while (likely((ph != NULL) || |
1029 | ((!(msg->msg_flags & MSG_DONTWAIT)) && | |
1030 | (atomic_read(&po->tx_ring.pending)))) | |
1031 | ); | |
69e3c75f JB |
1032 | |
1033 | err = len_sum; | |
1034 | goto out_put; | |
1035 | ||
1036 | out_xmit: | |
1037 | skb->destructor = sock_wfree; | |
1038 | atomic_dec(&po->tx_ring.pending); | |
1039 | out_status: | |
1040 | __packet_set_status(po, ph, status); | |
1041 | kfree_skb(skb); | |
1042 | out_put: | |
1043 | dev_put(dev); | |
1044 | out: | |
1045 | mutex_unlock(&po->pg_vec_lock); | |
1046 | return err; | |
1047 | } | |
1048 | #endif | |
1049 | ||
1050 | static int packet_snd(struct socket *sock, | |
1da177e4 LT |
1051 | struct msghdr *msg, size_t len) |
1052 | { | |
1053 | struct sock *sk = sock->sk; | |
40d4e3df | 1054 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
1da177e4 LT |
1055 | struct sk_buff *skb; |
1056 | struct net_device *dev; | |
0e11c91e | 1057 | __be16 proto; |
1da177e4 LT |
1058 | unsigned char *addr; |
1059 | int ifindex, err, reserve = 0; | |
1060 | ||
1061 | /* | |
1ce4f28b | 1062 | * Get and verify the address. |
1da177e4 | 1063 | */ |
1ce4f28b | 1064 | |
1da177e4 LT |
1065 | if (saddr == NULL) { |
1066 | struct packet_sock *po = pkt_sk(sk); | |
1067 | ||
1068 | ifindex = po->ifindex; | |
1069 | proto = po->num; | |
1070 | addr = NULL; | |
1071 | } else { | |
1072 | err = -EINVAL; | |
1073 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
1074 | goto out; | |
0fb375fb EB |
1075 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
1076 | goto out; | |
1da177e4 LT |
1077 | ifindex = saddr->sll_ifindex; |
1078 | proto = saddr->sll_protocol; | |
1079 | addr = saddr->sll_addr; | |
1080 | } | |
1081 | ||
1082 | ||
3b1e0a65 | 1083 | dev = dev_get_by_index(sock_net(sk), ifindex); |
1da177e4 LT |
1084 | err = -ENXIO; |
1085 | if (dev == NULL) | |
1086 | goto out_unlock; | |
1087 | if (sock->type == SOCK_RAW) | |
1088 | reserve = dev->hard_header_len; | |
1089 | ||
d5e76b0a DM |
1090 | err = -ENETDOWN; |
1091 | if (!(dev->flags & IFF_UP)) | |
1092 | goto out_unlock; | |
1093 | ||
1da177e4 LT |
1094 | err = -EMSGSIZE; |
1095 | if (len > dev->mtu+reserve) | |
1096 | goto out_unlock; | |
1097 | ||
f5184d26 | 1098 | skb = sock_alloc_send_skb(sk, len + LL_ALLOCATED_SPACE(dev), |
1da177e4 | 1099 | msg->msg_flags & MSG_DONTWAIT, &err); |
40d4e3df | 1100 | if (skb == NULL) |
1da177e4 LT |
1101 | goto out_unlock; |
1102 | ||
1103 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
c1d2bbe1 | 1104 | skb_reset_network_header(skb); |
1da177e4 | 1105 | |
0c4e8581 SH |
1106 | err = -EINVAL; |
1107 | if (sock->type == SOCK_DGRAM && | |
1108 | dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len) < 0) | |
1109 | goto out_free; | |
1da177e4 LT |
1110 | |
1111 | /* Returns -EFAULT on error */ | |
40d4e3df | 1112 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
1da177e4 LT |
1113 | if (err) |
1114 | goto out_free; | |
1115 | ||
1116 | skb->protocol = proto; | |
1117 | skb->dev = dev; | |
1118 | skb->priority = sk->sk_priority; | |
2d37a186 | 1119 | skb->mark = sk->sk_mark; |
1da177e4 | 1120 | |
1da177e4 LT |
1121 | /* |
1122 | * Now send it | |
1123 | */ | |
1124 | ||
1125 | err = dev_queue_xmit(skb); | |
1126 | if (err > 0 && (err = net_xmit_errno(err)) != 0) | |
1127 | goto out_unlock; | |
1128 | ||
1129 | dev_put(dev); | |
1130 | ||
40d4e3df | 1131 | return len; |
1da177e4 LT |
1132 | |
1133 | out_free: | |
1134 | kfree_skb(skb); | |
1135 | out_unlock: | |
1136 | if (dev) | |
1137 | dev_put(dev); | |
1138 | out: | |
1139 | return err; | |
1140 | } | |
1141 | ||
69e3c75f JB |
1142 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
1143 | struct msghdr *msg, size_t len) | |
1144 | { | |
1145 | #ifdef CONFIG_PACKET_MMAP | |
1146 | struct sock *sk = sock->sk; | |
1147 | struct packet_sock *po = pkt_sk(sk); | |
1148 | if (po->tx_ring.pg_vec) | |
1149 | return tpacket_snd(po, msg); | |
1150 | else | |
1151 | #endif | |
1152 | return packet_snd(sock, msg, len); | |
1153 | } | |
1154 | ||
1da177e4 LT |
1155 | /* |
1156 | * Close a PACKET socket. This is fairly simple. We immediately go | |
1157 | * to 'closed' state and remove our protocol entry in the device list. | |
1158 | */ | |
1159 | ||
1160 | static int packet_release(struct socket *sock) | |
1161 | { | |
1162 | struct sock *sk = sock->sk; | |
1163 | struct packet_sock *po; | |
d12d01d6 | 1164 | struct net *net; |
69e3c75f JB |
1165 | #ifdef CONFIG_PACKET_MMAP |
1166 | struct tpacket_req req; | |
1167 | #endif | |
1da177e4 LT |
1168 | |
1169 | if (!sk) | |
1170 | return 0; | |
1171 | ||
3b1e0a65 | 1172 | net = sock_net(sk); |
1da177e4 LT |
1173 | po = pkt_sk(sk); |
1174 | ||
2aaef4e4 | 1175 | write_lock_bh(&net->packet.sklist_lock); |
1da177e4 | 1176 | sk_del_node_init(sk); |
920de804 | 1177 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
2aaef4e4 | 1178 | write_unlock_bh(&net->packet.sklist_lock); |
1da177e4 LT |
1179 | |
1180 | /* | |
1181 | * Unhook packet receive handler. | |
1182 | */ | |
1183 | ||
1184 | if (po->running) { | |
1185 | /* | |
1186 | * Remove the protocol hook | |
1187 | */ | |
1188 | dev_remove_pack(&po->prot_hook); | |
1189 | po->running = 0; | |
1190 | po->num = 0; | |
1191 | __sock_put(sk); | |
1192 | } | |
1193 | ||
1da177e4 | 1194 | packet_flush_mclist(sk); |
1da177e4 LT |
1195 | |
1196 | #ifdef CONFIG_PACKET_MMAP | |
69e3c75f JB |
1197 | memset(&req, 0, sizeof(req)); |
1198 | ||
1199 | if (po->rx_ring.pg_vec) | |
1200 | packet_set_ring(sk, &req, 1, 0); | |
1201 | ||
1202 | if (po->tx_ring.pg_vec) | |
1203 | packet_set_ring(sk, &req, 1, 1); | |
1da177e4 LT |
1204 | #endif |
1205 | ||
1206 | /* | |
1207 | * Now the socket is dead. No more input will appear. | |
1208 | */ | |
1209 | ||
1210 | sock_orphan(sk); | |
1211 | sock->sk = NULL; | |
1212 | ||
1213 | /* Purge queues */ | |
1214 | ||
1215 | skb_queue_purge(&sk->sk_receive_queue); | |
17ab56a2 | 1216 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
1217 | |
1218 | sock_put(sk); | |
1219 | return 0; | |
1220 | } | |
1221 | ||
1222 | /* | |
1223 | * Attach a packet hook. | |
1224 | */ | |
1225 | ||
0e11c91e | 1226 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
1da177e4 LT |
1227 | { |
1228 | struct packet_sock *po = pkt_sk(sk); | |
1229 | /* | |
1230 | * Detach an existing hook if present. | |
1231 | */ | |
1232 | ||
1233 | lock_sock(sk); | |
1234 | ||
1235 | spin_lock(&po->bind_lock); | |
1236 | if (po->running) { | |
1237 | __sock_put(sk); | |
1238 | po->running = 0; | |
1239 | po->num = 0; | |
1240 | spin_unlock(&po->bind_lock); | |
1241 | dev_remove_pack(&po->prot_hook); | |
1242 | spin_lock(&po->bind_lock); | |
1243 | } | |
1244 | ||
1245 | po->num = protocol; | |
1246 | po->prot_hook.type = protocol; | |
1247 | po->prot_hook.dev = dev; | |
1248 | ||
1249 | po->ifindex = dev ? dev->ifindex : 0; | |
1250 | ||
1251 | if (protocol == 0) | |
1252 | goto out_unlock; | |
1253 | ||
be85d4ad | 1254 | if (!dev || (dev->flags & IFF_UP)) { |
1da177e4 LT |
1255 | dev_add_pack(&po->prot_hook); |
1256 | sock_hold(sk); | |
1257 | po->running = 1; | |
be85d4ad UT |
1258 | } else { |
1259 | sk->sk_err = ENETDOWN; | |
1260 | if (!sock_flag(sk, SOCK_DEAD)) | |
1261 | sk->sk_error_report(sk); | |
1da177e4 LT |
1262 | } |
1263 | ||
1264 | out_unlock: | |
1265 | spin_unlock(&po->bind_lock); | |
1266 | release_sock(sk); | |
1267 | return 0; | |
1268 | } | |
1269 | ||
1270 | /* | |
1271 | * Bind a packet socket to a device | |
1272 | */ | |
1273 | ||
40d4e3df ED |
1274 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
1275 | int addr_len) | |
1da177e4 | 1276 | { |
40d4e3df | 1277 | struct sock *sk = sock->sk; |
1da177e4 LT |
1278 | char name[15]; |
1279 | struct net_device *dev; | |
1280 | int err = -ENODEV; | |
1ce4f28b | 1281 | |
1da177e4 LT |
1282 | /* |
1283 | * Check legality | |
1284 | */ | |
1ce4f28b | 1285 | |
8ae55f04 | 1286 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 | 1287 | return -EINVAL; |
40d4e3df | 1288 | strlcpy(name, uaddr->sa_data, sizeof(name)); |
1da177e4 | 1289 | |
3b1e0a65 | 1290 | dev = dev_get_by_name(sock_net(sk), name); |
1da177e4 LT |
1291 | if (dev) { |
1292 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); | |
1293 | dev_put(dev); | |
1294 | } | |
1295 | return err; | |
1296 | } | |
1da177e4 LT |
1297 | |
1298 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
1299 | { | |
40d4e3df ED |
1300 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
1301 | struct sock *sk = sock->sk; | |
1da177e4 LT |
1302 | struct net_device *dev = NULL; |
1303 | int err; | |
1304 | ||
1305 | ||
1306 | /* | |
1307 | * Check legality | |
1308 | */ | |
1ce4f28b | 1309 | |
1da177e4 LT |
1310 | if (addr_len < sizeof(struct sockaddr_ll)) |
1311 | return -EINVAL; | |
1312 | if (sll->sll_family != AF_PACKET) | |
1313 | return -EINVAL; | |
1314 | ||
1315 | if (sll->sll_ifindex) { | |
1316 | err = -ENODEV; | |
3b1e0a65 | 1317 | dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex); |
1da177e4 LT |
1318 | if (dev == NULL) |
1319 | goto out; | |
1320 | } | |
1321 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
1322 | if (dev) | |
1323 | dev_put(dev); | |
1324 | ||
1325 | out: | |
1326 | return err; | |
1327 | } | |
1328 | ||
1329 | static struct proto packet_proto = { | |
1330 | .name = "PACKET", | |
1331 | .owner = THIS_MODULE, | |
1332 | .obj_size = sizeof(struct packet_sock), | |
1333 | }; | |
1334 | ||
1335 | /* | |
1ce4f28b | 1336 | * Create a packet of type SOCK_PACKET. |
1da177e4 LT |
1337 | */ |
1338 | ||
3f378b68 EP |
1339 | static int packet_create(struct net *net, struct socket *sock, int protocol, |
1340 | int kern) | |
1da177e4 LT |
1341 | { |
1342 | struct sock *sk; | |
1343 | struct packet_sock *po; | |
0e11c91e | 1344 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1da177e4 LT |
1345 | int err; |
1346 | ||
1347 | if (!capable(CAP_NET_RAW)) | |
1348 | return -EPERM; | |
be02097c DM |
1349 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
1350 | sock->type != SOCK_PACKET) | |
1da177e4 LT |
1351 | return -ESOCKTNOSUPPORT; |
1352 | ||
1353 | sock->state = SS_UNCONNECTED; | |
1354 | ||
1355 | err = -ENOBUFS; | |
6257ff21 | 1356 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto); |
1da177e4 LT |
1357 | if (sk == NULL) |
1358 | goto out; | |
1359 | ||
1360 | sock->ops = &packet_ops; | |
1da177e4 LT |
1361 | if (sock->type == SOCK_PACKET) |
1362 | sock->ops = &packet_ops_spkt; | |
be02097c | 1363 | |
1da177e4 LT |
1364 | sock_init_data(sock, sk); |
1365 | ||
1366 | po = pkt_sk(sk); | |
1367 | sk->sk_family = PF_PACKET; | |
0e11c91e | 1368 | po->num = proto; |
1da177e4 LT |
1369 | |
1370 | sk->sk_destruct = packet_sock_destruct; | |
17ab56a2 | 1371 | sk_refcnt_debug_inc(sk); |
1da177e4 LT |
1372 | |
1373 | /* | |
1374 | * Attach a protocol block | |
1375 | */ | |
1376 | ||
1377 | spin_lock_init(&po->bind_lock); | |
905db440 | 1378 | mutex_init(&po->pg_vec_lock); |
1da177e4 | 1379 | po->prot_hook.func = packet_rcv; |
be02097c | 1380 | |
1da177e4 LT |
1381 | if (sock->type == SOCK_PACKET) |
1382 | po->prot_hook.func = packet_rcv_spkt; | |
be02097c | 1383 | |
1da177e4 LT |
1384 | po->prot_hook.af_packet_priv = sk; |
1385 | ||
0e11c91e AV |
1386 | if (proto) { |
1387 | po->prot_hook.type = proto; | |
1da177e4 LT |
1388 | dev_add_pack(&po->prot_hook); |
1389 | sock_hold(sk); | |
1390 | po->running = 1; | |
1391 | } | |
1392 | ||
2aaef4e4 DL |
1393 | write_lock_bh(&net->packet.sklist_lock); |
1394 | sk_add_node(sk, &net->packet.sklist); | |
3680453c | 1395 | sock_prot_inuse_add(net, &packet_proto, 1); |
920de804 | 1396 | write_unlock_bh(&net->packet.sklist_lock); |
40d4e3df | 1397 | return 0; |
1da177e4 LT |
1398 | out: |
1399 | return err; | |
1400 | } | |
1401 | ||
1402 | /* | |
1403 | * Pull a packet from our receive queue and hand it to the user. | |
1404 | * If necessary we block. | |
1405 | */ | |
1406 | ||
1407 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1408 | struct msghdr *msg, size_t len, int flags) | |
1409 | { | |
1410 | struct sock *sk = sock->sk; | |
1411 | struct sk_buff *skb; | |
1412 | int copied, err; | |
0fb375fb | 1413 | struct sockaddr_ll *sll; |
1da177e4 LT |
1414 | |
1415 | err = -EINVAL; | |
1416 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) | |
1417 | goto out; | |
1418 | ||
1419 | #if 0 | |
1420 | /* What error should we return now? EUNATTACH? */ | |
1421 | if (pkt_sk(sk)->ifindex < 0) | |
1422 | return -ENODEV; | |
1423 | #endif | |
1424 | ||
1da177e4 LT |
1425 | /* |
1426 | * Call the generic datagram receiver. This handles all sorts | |
1427 | * of horrible races and re-entrancy so we can forget about it | |
1428 | * in the protocol layers. | |
1429 | * | |
1430 | * Now it will return ENETDOWN, if device have just gone down, | |
1431 | * but then it will block. | |
1432 | */ | |
1433 | ||
40d4e3df | 1434 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
1da177e4 LT |
1435 | |
1436 | /* | |
1ce4f28b | 1437 | * An error occurred so return it. Because skb_recv_datagram() |
1da177e4 LT |
1438 | * handles the blocking we don't see and worry about blocking |
1439 | * retries. | |
1440 | */ | |
1441 | ||
8ae55f04 | 1442 | if (skb == NULL) |
1da177e4 LT |
1443 | goto out; |
1444 | ||
0fb375fb EB |
1445 | /* |
1446 | * If the address length field is there to be filled in, we fill | |
1447 | * it in now. | |
1448 | */ | |
1449 | ||
ffbc6111 | 1450 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
0fb375fb EB |
1451 | if (sock->type == SOCK_PACKET) |
1452 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
1453 | else | |
1454 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); | |
1455 | ||
1da177e4 LT |
1456 | /* |
1457 | * You lose any data beyond the buffer you gave. If it worries a | |
1458 | * user program they can ask the device for its MTU anyway. | |
1459 | */ | |
1460 | ||
1461 | copied = skb->len; | |
40d4e3df ED |
1462 | if (copied > len) { |
1463 | copied = len; | |
1464 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 LT |
1465 | } |
1466 | ||
1467 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1468 | if (err) | |
1469 | goto out_free; | |
1470 | ||
3b885787 | 1471 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
1472 | |
1473 | if (msg->msg_name) | |
ffbc6111 HX |
1474 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
1475 | msg->msg_namelen); | |
1da177e4 | 1476 | |
8dc41944 | 1477 | if (pkt_sk(sk)->auxdata) { |
ffbc6111 HX |
1478 | struct tpacket_auxdata aux; |
1479 | ||
1480 | aux.tp_status = TP_STATUS_USER; | |
1481 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
1482 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; | |
1483 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; | |
1484 | aux.tp_snaplen = skb->len; | |
1485 | aux.tp_mac = 0; | |
bbe735e4 | 1486 | aux.tp_net = skb_network_offset(skb); |
05423b24 | 1487 | aux.tp_vlan_tci = vlan_tx_tag_get(skb); |
ffbc6111 HX |
1488 | |
1489 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); | |
8dc41944 HX |
1490 | } |
1491 | ||
1da177e4 LT |
1492 | /* |
1493 | * Free or return the buffer as appropriate. Again this | |
1494 | * hides all the races and re-entrancy issues from us. | |
1495 | */ | |
1496 | err = (flags&MSG_TRUNC) ? skb->len : copied; | |
1497 | ||
1498 | out_free: | |
1499 | skb_free_datagram(sk, skb); | |
1500 | out: | |
1501 | return err; | |
1502 | } | |
1503 | ||
1da177e4 LT |
1504 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
1505 | int *uaddr_len, int peer) | |
1506 | { | |
1507 | struct net_device *dev; | |
1508 | struct sock *sk = sock->sk; | |
1509 | ||
1510 | if (peer) | |
1511 | return -EOPNOTSUPP; | |
1512 | ||
1513 | uaddr->sa_family = AF_PACKET; | |
654d1f8a ED |
1514 | rcu_read_lock(); |
1515 | dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); | |
1516 | if (dev) | |
1da177e4 | 1517 | strlcpy(uaddr->sa_data, dev->name, 15); |
654d1f8a | 1518 | else |
1da177e4 | 1519 | memset(uaddr->sa_data, 0, 14); |
654d1f8a | 1520 | rcu_read_unlock(); |
1da177e4 LT |
1521 | *uaddr_len = sizeof(*uaddr); |
1522 | ||
1523 | return 0; | |
1524 | } | |
1da177e4 LT |
1525 | |
1526 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
1527 | int *uaddr_len, int peer) | |
1528 | { | |
1529 | struct net_device *dev; | |
1530 | struct sock *sk = sock->sk; | |
1531 | struct packet_sock *po = pkt_sk(sk); | |
13cfa97b | 1532 | DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr); |
1da177e4 LT |
1533 | |
1534 | if (peer) | |
1535 | return -EOPNOTSUPP; | |
1536 | ||
1537 | sll->sll_family = AF_PACKET; | |
1538 | sll->sll_ifindex = po->ifindex; | |
1539 | sll->sll_protocol = po->num; | |
654d1f8a ED |
1540 | rcu_read_lock(); |
1541 | dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex); | |
1da177e4 LT |
1542 | if (dev) { |
1543 | sll->sll_hatype = dev->type; | |
1544 | sll->sll_halen = dev->addr_len; | |
1545 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1da177e4 LT |
1546 | } else { |
1547 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
1548 | sll->sll_halen = 0; | |
1549 | } | |
654d1f8a | 1550 | rcu_read_unlock(); |
0fb375fb | 1551 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
1552 | |
1553 | return 0; | |
1554 | } | |
1555 | ||
2aeb0b88 WC |
1556 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
1557 | int what) | |
1da177e4 LT |
1558 | { |
1559 | switch (i->type) { | |
1560 | case PACKET_MR_MULTICAST: | |
1561 | if (what > 0) | |
d95ed927 | 1562 | return dev_mc_add(dev, i->addr, i->alen, 0); |
1da177e4 | 1563 | else |
d95ed927 | 1564 | return dev_mc_delete(dev, i->addr, i->alen, 0); |
1da177e4 LT |
1565 | break; |
1566 | case PACKET_MR_PROMISC: | |
2aeb0b88 | 1567 | return dev_set_promiscuity(dev, what); |
1da177e4 LT |
1568 | break; |
1569 | case PACKET_MR_ALLMULTI: | |
2aeb0b88 | 1570 | return dev_set_allmulti(dev, what); |
1da177e4 | 1571 | break; |
d95ed927 EB |
1572 | case PACKET_MR_UNICAST: |
1573 | if (what > 0) | |
ccffad25 | 1574 | return dev_unicast_add(dev, i->addr); |
d95ed927 | 1575 | else |
ccffad25 | 1576 | return dev_unicast_delete(dev, i->addr); |
d95ed927 | 1577 | break; |
40d4e3df ED |
1578 | default: |
1579 | break; | |
1da177e4 | 1580 | } |
2aeb0b88 | 1581 | return 0; |
1da177e4 LT |
1582 | } |
1583 | ||
1584 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
1585 | { | |
40d4e3df | 1586 | for ( ; i; i = i->next) { |
1da177e4 LT |
1587 | if (i->ifindex == dev->ifindex) |
1588 | packet_dev_mc(dev, i, what); | |
1589 | } | |
1590 | } | |
1591 | ||
0fb375fb | 1592 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1593 | { |
1594 | struct packet_sock *po = pkt_sk(sk); | |
1595 | struct packet_mclist *ml, *i; | |
1596 | struct net_device *dev; | |
1597 | int err; | |
1598 | ||
1599 | rtnl_lock(); | |
1600 | ||
1601 | err = -ENODEV; | |
3b1e0a65 | 1602 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
1da177e4 LT |
1603 | if (!dev) |
1604 | goto done; | |
1605 | ||
1606 | err = -EINVAL; | |
1607 | if (mreq->mr_alen > dev->addr_len) | |
1608 | goto done; | |
1609 | ||
1610 | err = -ENOBUFS; | |
8b3a7005 | 1611 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
1612 | if (i == NULL) |
1613 | goto done; | |
1614 | ||
1615 | err = 0; | |
1616 | for (ml = po->mclist; ml; ml = ml->next) { | |
1617 | if (ml->ifindex == mreq->mr_ifindex && | |
1618 | ml->type == mreq->mr_type && | |
1619 | ml->alen == mreq->mr_alen && | |
1620 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1621 | ml->count++; | |
1622 | /* Free the new element ... */ | |
1623 | kfree(i); | |
1624 | goto done; | |
1625 | } | |
1626 | } | |
1627 | ||
1628 | i->type = mreq->mr_type; | |
1629 | i->ifindex = mreq->mr_ifindex; | |
1630 | i->alen = mreq->mr_alen; | |
1631 | memcpy(i->addr, mreq->mr_address, i->alen); | |
1632 | i->count = 1; | |
1633 | i->next = po->mclist; | |
1634 | po->mclist = i; | |
2aeb0b88 WC |
1635 | err = packet_dev_mc(dev, i, 1); |
1636 | if (err) { | |
1637 | po->mclist = i->next; | |
1638 | kfree(i); | |
1639 | } | |
1da177e4 LT |
1640 | |
1641 | done: | |
1642 | rtnl_unlock(); | |
1643 | return err; | |
1644 | } | |
1645 | ||
0fb375fb | 1646 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1647 | { |
1648 | struct packet_mclist *ml, **mlp; | |
1649 | ||
1650 | rtnl_lock(); | |
1651 | ||
1652 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
1653 | if (ml->ifindex == mreq->mr_ifindex && | |
1654 | ml->type == mreq->mr_type && | |
1655 | ml->alen == mreq->mr_alen && | |
1656 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1657 | if (--ml->count == 0) { | |
1658 | struct net_device *dev; | |
1659 | *mlp = ml->next; | |
ad959e76 ED |
1660 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1661 | if (dev) | |
1da177e4 | 1662 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
1663 | kfree(ml); |
1664 | } | |
1665 | rtnl_unlock(); | |
1666 | return 0; | |
1667 | } | |
1668 | } | |
1669 | rtnl_unlock(); | |
1670 | return -EADDRNOTAVAIL; | |
1671 | } | |
1672 | ||
1673 | static void packet_flush_mclist(struct sock *sk) | |
1674 | { | |
1675 | struct packet_sock *po = pkt_sk(sk); | |
1676 | struct packet_mclist *ml; | |
1677 | ||
1678 | if (!po->mclist) | |
1679 | return; | |
1680 | ||
1681 | rtnl_lock(); | |
1682 | while ((ml = po->mclist) != NULL) { | |
1683 | struct net_device *dev; | |
1684 | ||
1685 | po->mclist = ml->next; | |
ad959e76 ED |
1686 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1687 | if (dev != NULL) | |
1da177e4 | 1688 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
1689 | kfree(ml); |
1690 | } | |
1691 | rtnl_unlock(); | |
1692 | } | |
1da177e4 LT |
1693 | |
1694 | static int | |
b7058842 | 1695 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1696 | { |
1697 | struct sock *sk = sock->sk; | |
8dc41944 | 1698 | struct packet_sock *po = pkt_sk(sk); |
1da177e4 LT |
1699 | int ret; |
1700 | ||
1701 | if (level != SOL_PACKET) | |
1702 | return -ENOPROTOOPT; | |
1703 | ||
69e3c75f | 1704 | switch (optname) { |
1ce4f28b | 1705 | case PACKET_ADD_MEMBERSHIP: |
1da177e4 LT |
1706 | case PACKET_DROP_MEMBERSHIP: |
1707 | { | |
0fb375fb EB |
1708 | struct packet_mreq_max mreq; |
1709 | int len = optlen; | |
1710 | memset(&mreq, 0, sizeof(mreq)); | |
1711 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 1712 | return -EINVAL; |
0fb375fb EB |
1713 | if (len > sizeof(mreq)) |
1714 | len = sizeof(mreq); | |
40d4e3df | 1715 | if (copy_from_user(&mreq, optval, len)) |
1da177e4 | 1716 | return -EFAULT; |
0fb375fb EB |
1717 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
1718 | return -EINVAL; | |
1da177e4 LT |
1719 | if (optname == PACKET_ADD_MEMBERSHIP) |
1720 | ret = packet_mc_add(sk, &mreq); | |
1721 | else | |
1722 | ret = packet_mc_drop(sk, &mreq); | |
1723 | return ret; | |
1724 | } | |
a2efcfa0 | 1725 | |
1da177e4 LT |
1726 | #ifdef CONFIG_PACKET_MMAP |
1727 | case PACKET_RX_RING: | |
69e3c75f | 1728 | case PACKET_TX_RING: |
1da177e4 LT |
1729 | { |
1730 | struct tpacket_req req; | |
1731 | ||
40d4e3df | 1732 | if (optlen < sizeof(req)) |
1da177e4 | 1733 | return -EINVAL; |
40d4e3df | 1734 | if (copy_from_user(&req, optval, sizeof(req))) |
1da177e4 | 1735 | return -EFAULT; |
69e3c75f | 1736 | return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING); |
1da177e4 LT |
1737 | } |
1738 | case PACKET_COPY_THRESH: | |
1739 | { | |
1740 | int val; | |
1741 | ||
40d4e3df | 1742 | if (optlen != sizeof(val)) |
1da177e4 | 1743 | return -EINVAL; |
40d4e3df | 1744 | if (copy_from_user(&val, optval, sizeof(val))) |
1da177e4 LT |
1745 | return -EFAULT; |
1746 | ||
1747 | pkt_sk(sk)->copy_thresh = val; | |
1748 | return 0; | |
1749 | } | |
bbd6ef87 PM |
1750 | case PACKET_VERSION: |
1751 | { | |
1752 | int val; | |
1753 | ||
1754 | if (optlen != sizeof(val)) | |
1755 | return -EINVAL; | |
69e3c75f | 1756 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
bbd6ef87 PM |
1757 | return -EBUSY; |
1758 | if (copy_from_user(&val, optval, sizeof(val))) | |
1759 | return -EFAULT; | |
1760 | switch (val) { | |
1761 | case TPACKET_V1: | |
1762 | case TPACKET_V2: | |
1763 | po->tp_version = val; | |
1764 | return 0; | |
1765 | default: | |
1766 | return -EINVAL; | |
1767 | } | |
1768 | } | |
8913336a PM |
1769 | case PACKET_RESERVE: |
1770 | { | |
1771 | unsigned int val; | |
1772 | ||
1773 | if (optlen != sizeof(val)) | |
1774 | return -EINVAL; | |
69e3c75f | 1775 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
8913336a PM |
1776 | return -EBUSY; |
1777 | if (copy_from_user(&val, optval, sizeof(val))) | |
1778 | return -EFAULT; | |
1779 | po->tp_reserve = val; | |
1780 | return 0; | |
1781 | } | |
69e3c75f JB |
1782 | case PACKET_LOSS: |
1783 | { | |
1784 | unsigned int val; | |
1785 | ||
1786 | if (optlen != sizeof(val)) | |
1787 | return -EINVAL; | |
1788 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
1789 | return -EBUSY; | |
1790 | if (copy_from_user(&val, optval, sizeof(val))) | |
1791 | return -EFAULT; | |
1792 | po->tp_loss = !!val; | |
1793 | return 0; | |
1794 | } | |
1da177e4 | 1795 | #endif |
8dc41944 HX |
1796 | case PACKET_AUXDATA: |
1797 | { | |
1798 | int val; | |
1799 | ||
1800 | if (optlen < sizeof(val)) | |
1801 | return -EINVAL; | |
1802 | if (copy_from_user(&val, optval, sizeof(val))) | |
1803 | return -EFAULT; | |
1804 | ||
1805 | po->auxdata = !!val; | |
1806 | return 0; | |
1807 | } | |
80feaacb PWJ |
1808 | case PACKET_ORIGDEV: |
1809 | { | |
1810 | int val; | |
1811 | ||
1812 | if (optlen < sizeof(val)) | |
1813 | return -EINVAL; | |
1814 | if (copy_from_user(&val, optval, sizeof(val))) | |
1815 | return -EFAULT; | |
1816 | ||
1817 | po->origdev = !!val; | |
1818 | return 0; | |
1819 | } | |
1da177e4 LT |
1820 | default: |
1821 | return -ENOPROTOOPT; | |
1822 | } | |
1823 | } | |
1824 | ||
1825 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
1826 | char __user *optval, int __user *optlen) | |
1827 | { | |
1828 | int len; | |
8dc41944 | 1829 | int val; |
1da177e4 LT |
1830 | struct sock *sk = sock->sk; |
1831 | struct packet_sock *po = pkt_sk(sk); | |
8dc41944 HX |
1832 | void *data; |
1833 | struct tpacket_stats st; | |
1da177e4 LT |
1834 | |
1835 | if (level != SOL_PACKET) | |
1836 | return -ENOPROTOOPT; | |
1837 | ||
8ae55f04 KK |
1838 | if (get_user(len, optlen)) |
1839 | return -EFAULT; | |
1da177e4 LT |
1840 | |
1841 | if (len < 0) | |
1842 | return -EINVAL; | |
1ce4f28b | 1843 | |
69e3c75f | 1844 | switch (optname) { |
1da177e4 | 1845 | case PACKET_STATISTICS: |
1da177e4 LT |
1846 | if (len > sizeof(struct tpacket_stats)) |
1847 | len = sizeof(struct tpacket_stats); | |
1848 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1849 | st = po->stats; | |
1850 | memset(&po->stats, 0, sizeof(st)); | |
1851 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1852 | st.tp_packets += st.tp_drops; | |
1853 | ||
8dc41944 HX |
1854 | data = &st; |
1855 | break; | |
1856 | case PACKET_AUXDATA: | |
1857 | if (len > sizeof(int)) | |
1858 | len = sizeof(int); | |
1859 | val = po->auxdata; | |
1860 | ||
80feaacb PWJ |
1861 | data = &val; |
1862 | break; | |
1863 | case PACKET_ORIGDEV: | |
1864 | if (len > sizeof(int)) | |
1865 | len = sizeof(int); | |
1866 | val = po->origdev; | |
1867 | ||
8dc41944 | 1868 | data = &val; |
1da177e4 | 1869 | break; |
bbd6ef87 PM |
1870 | #ifdef CONFIG_PACKET_MMAP |
1871 | case PACKET_VERSION: | |
1872 | if (len > sizeof(int)) | |
1873 | len = sizeof(int); | |
1874 | val = po->tp_version; | |
1875 | data = &val; | |
1876 | break; | |
1877 | case PACKET_HDRLEN: | |
1878 | if (len > sizeof(int)) | |
1879 | len = sizeof(int); | |
1880 | if (copy_from_user(&val, optval, len)) | |
1881 | return -EFAULT; | |
1882 | switch (val) { | |
1883 | case TPACKET_V1: | |
1884 | val = sizeof(struct tpacket_hdr); | |
1885 | break; | |
1886 | case TPACKET_V2: | |
1887 | val = sizeof(struct tpacket2_hdr); | |
1888 | break; | |
1889 | default: | |
1890 | return -EINVAL; | |
1891 | } | |
1892 | data = &val; | |
1893 | break; | |
8913336a PM |
1894 | case PACKET_RESERVE: |
1895 | if (len > sizeof(unsigned int)) | |
1896 | len = sizeof(unsigned int); | |
1897 | val = po->tp_reserve; | |
1898 | data = &val; | |
1899 | break; | |
69e3c75f JB |
1900 | case PACKET_LOSS: |
1901 | if (len > sizeof(unsigned int)) | |
1902 | len = sizeof(unsigned int); | |
1903 | val = po->tp_loss; | |
1904 | data = &val; | |
1905 | break; | |
bbd6ef87 | 1906 | #endif |
1da177e4 LT |
1907 | default: |
1908 | return -ENOPROTOOPT; | |
1909 | } | |
1910 | ||
8ae55f04 KK |
1911 | if (put_user(len, optlen)) |
1912 | return -EFAULT; | |
8dc41944 HX |
1913 | if (copy_to_user(optval, data, len)) |
1914 | return -EFAULT; | |
8ae55f04 | 1915 | return 0; |
1da177e4 LT |
1916 | } |
1917 | ||
1918 | ||
1919 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) | |
1920 | { | |
1921 | struct sock *sk; | |
1922 | struct hlist_node *node; | |
ad930650 | 1923 | struct net_device *dev = data; |
c346dca1 | 1924 | struct net *net = dev_net(dev); |
1da177e4 | 1925 | |
2aaef4e4 DL |
1926 | read_lock(&net->packet.sklist_lock); |
1927 | sk_for_each(sk, node, &net->packet.sklist) { | |
1da177e4 LT |
1928 | struct packet_sock *po = pkt_sk(sk); |
1929 | ||
1930 | switch (msg) { | |
1931 | case NETDEV_UNREGISTER: | |
1da177e4 LT |
1932 | if (po->mclist) |
1933 | packet_dev_mclist(dev, po->mclist, -1); | |
a2efcfa0 DM |
1934 | /* fallthrough */ |
1935 | ||
1da177e4 LT |
1936 | case NETDEV_DOWN: |
1937 | if (dev->ifindex == po->ifindex) { | |
1938 | spin_lock(&po->bind_lock); | |
1939 | if (po->running) { | |
1940 | __dev_remove_pack(&po->prot_hook); | |
1941 | __sock_put(sk); | |
1942 | po->running = 0; | |
1943 | sk->sk_err = ENETDOWN; | |
1944 | if (!sock_flag(sk, SOCK_DEAD)) | |
1945 | sk->sk_error_report(sk); | |
1946 | } | |
1947 | if (msg == NETDEV_UNREGISTER) { | |
1948 | po->ifindex = -1; | |
1949 | po->prot_hook.dev = NULL; | |
1950 | } | |
1951 | spin_unlock(&po->bind_lock); | |
1952 | } | |
1953 | break; | |
1954 | case NETDEV_UP: | |
1955 | spin_lock(&po->bind_lock); | |
1956 | if (dev->ifindex == po->ifindex && po->num && | |
1957 | !po->running) { | |
1958 | dev_add_pack(&po->prot_hook); | |
1959 | sock_hold(sk); | |
1960 | po->running = 1; | |
1961 | } | |
1962 | spin_unlock(&po->bind_lock); | |
1963 | break; | |
1964 | } | |
1965 | } | |
2aaef4e4 | 1966 | read_unlock(&net->packet.sklist_lock); |
1da177e4 LT |
1967 | return NOTIFY_DONE; |
1968 | } | |
1969 | ||
1970 | ||
1971 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
1972 | unsigned long arg) | |
1973 | { | |
1974 | struct sock *sk = sock->sk; | |
1975 | ||
69e3c75f | 1976 | switch (cmd) { |
40d4e3df ED |
1977 | case SIOCOUTQ: |
1978 | { | |
1979 | int amount = sk_wmem_alloc_get(sk); | |
31e6d363 | 1980 | |
40d4e3df ED |
1981 | return put_user(amount, (int __user *)arg); |
1982 | } | |
1983 | case SIOCINQ: | |
1984 | { | |
1985 | struct sk_buff *skb; | |
1986 | int amount = 0; | |
1987 | ||
1988 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1989 | skb = skb_peek(&sk->sk_receive_queue); | |
1990 | if (skb) | |
1991 | amount = skb->len; | |
1992 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1993 | return put_user(amount, (int __user *)arg); | |
1994 | } | |
1995 | case SIOCGSTAMP: | |
1996 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
1997 | case SIOCGSTAMPNS: | |
1998 | return sock_get_timestampns(sk, (struct timespec __user *)arg); | |
1ce4f28b | 1999 | |
1da177e4 | 2000 | #ifdef CONFIG_INET |
40d4e3df ED |
2001 | case SIOCADDRT: |
2002 | case SIOCDELRT: | |
2003 | case SIOCDARP: | |
2004 | case SIOCGARP: | |
2005 | case SIOCSARP: | |
2006 | case SIOCGIFADDR: | |
2007 | case SIOCSIFADDR: | |
2008 | case SIOCGIFBRDADDR: | |
2009 | case SIOCSIFBRDADDR: | |
2010 | case SIOCGIFNETMASK: | |
2011 | case SIOCSIFNETMASK: | |
2012 | case SIOCGIFDSTADDR: | |
2013 | case SIOCSIFDSTADDR: | |
2014 | case SIOCSIFFLAGS: | |
2015 | if (!net_eq(sock_net(sk), &init_net)) | |
2016 | return -ENOIOCTLCMD; | |
2017 | return inet_dgram_ops.ioctl(sock, cmd, arg); | |
1da177e4 LT |
2018 | #endif |
2019 | ||
40d4e3df ED |
2020 | default: |
2021 | return -ENOIOCTLCMD; | |
1da177e4 LT |
2022 | } |
2023 | return 0; | |
2024 | } | |
2025 | ||
2026 | #ifndef CONFIG_PACKET_MMAP | |
2027 | #define packet_mmap sock_no_mmap | |
2028 | #define packet_poll datagram_poll | |
2029 | #else | |
2030 | ||
40d4e3df | 2031 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
1da177e4 LT |
2032 | poll_table *wait) |
2033 | { | |
2034 | struct sock *sk = sock->sk; | |
2035 | struct packet_sock *po = pkt_sk(sk); | |
2036 | unsigned int mask = datagram_poll(file, sock, wait); | |
2037 | ||
2038 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2039 | if (po->rx_ring.pg_vec) { |
2040 | if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL)) | |
1da177e4 LT |
2041 | mask |= POLLIN | POLLRDNORM; |
2042 | } | |
2043 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2044 | spin_lock_bh(&sk->sk_write_queue.lock); |
2045 | if (po->tx_ring.pg_vec) { | |
2046 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) | |
2047 | mask |= POLLOUT | POLLWRNORM; | |
2048 | } | |
2049 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
1da177e4 LT |
2050 | return mask; |
2051 | } | |
2052 | ||
2053 | ||
2054 | /* Dirty? Well, I still did not learn better way to account | |
2055 | * for user mmaps. | |
2056 | */ | |
2057 | ||
2058 | static void packet_mm_open(struct vm_area_struct *vma) | |
2059 | { | |
2060 | struct file *file = vma->vm_file; | |
40d4e3df | 2061 | struct socket *sock = file->private_data; |
1da177e4 | 2062 | struct sock *sk = sock->sk; |
1ce4f28b | 2063 | |
1da177e4 LT |
2064 | if (sk) |
2065 | atomic_inc(&pkt_sk(sk)->mapped); | |
2066 | } | |
2067 | ||
2068 | static void packet_mm_close(struct vm_area_struct *vma) | |
2069 | { | |
2070 | struct file *file = vma->vm_file; | |
40d4e3df | 2071 | struct socket *sock = file->private_data; |
1da177e4 | 2072 | struct sock *sk = sock->sk; |
1ce4f28b | 2073 | |
1da177e4 LT |
2074 | if (sk) |
2075 | atomic_dec(&pkt_sk(sk)->mapped); | |
2076 | } | |
2077 | ||
f0f37e2f | 2078 | static const struct vm_operations_struct packet_mmap_ops = { |
40d4e3df ED |
2079 | .open = packet_mm_open, |
2080 | .close = packet_mm_close, | |
1da177e4 LT |
2081 | }; |
2082 | ||
4ebf0ae2 | 2083 | static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len) |
1da177e4 LT |
2084 | { |
2085 | int i; | |
2086 | ||
4ebf0ae2 DM |
2087 | for (i = 0; i < len; i++) { |
2088 | if (likely(pg_vec[i])) | |
2089 | free_pages((unsigned long) pg_vec[i], order); | |
1da177e4 LT |
2090 | } |
2091 | kfree(pg_vec); | |
2092 | } | |
2093 | ||
4ebf0ae2 DM |
2094 | static inline char *alloc_one_pg_vec_page(unsigned long order) |
2095 | { | |
719bfeaa ED |
2096 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN; |
2097 | ||
2098 | return (char *) __get_free_pages(gfp_flags, order); | |
4ebf0ae2 DM |
2099 | } |
2100 | ||
2101 | static char **alloc_pg_vec(struct tpacket_req *req, int order) | |
2102 | { | |
2103 | unsigned int block_nr = req->tp_block_nr; | |
2104 | char **pg_vec; | |
2105 | int i; | |
2106 | ||
2107 | pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL); | |
2108 | if (unlikely(!pg_vec)) | |
2109 | goto out; | |
2110 | ||
2111 | for (i = 0; i < block_nr; i++) { | |
2112 | pg_vec[i] = alloc_one_pg_vec_page(order); | |
2113 | if (unlikely(!pg_vec[i])) | |
2114 | goto out_free_pgvec; | |
2115 | } | |
2116 | ||
2117 | out: | |
2118 | return pg_vec; | |
2119 | ||
2120 | out_free_pgvec: | |
2121 | free_pg_vec(pg_vec, order, block_nr); | |
2122 | pg_vec = NULL; | |
2123 | goto out; | |
2124 | } | |
1da177e4 | 2125 | |
69e3c75f JB |
2126 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
2127 | int closing, int tx_ring) | |
1da177e4 LT |
2128 | { |
2129 | char **pg_vec = NULL; | |
2130 | struct packet_sock *po = pkt_sk(sk); | |
0e11c91e | 2131 | int was_running, order = 0; |
69e3c75f JB |
2132 | struct packet_ring_buffer *rb; |
2133 | struct sk_buff_head *rb_queue; | |
0e11c91e | 2134 | __be16 num; |
69e3c75f | 2135 | int err; |
1ce4f28b | 2136 | |
69e3c75f JB |
2137 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
2138 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; | |
1da177e4 | 2139 | |
69e3c75f JB |
2140 | err = -EBUSY; |
2141 | if (!closing) { | |
2142 | if (atomic_read(&po->mapped)) | |
2143 | goto out; | |
2144 | if (atomic_read(&rb->pending)) | |
2145 | goto out; | |
2146 | } | |
1da177e4 | 2147 | |
69e3c75f JB |
2148 | if (req->tp_block_nr) { |
2149 | /* Sanity tests and some calculations */ | |
2150 | err = -EBUSY; | |
2151 | if (unlikely(rb->pg_vec)) | |
2152 | goto out; | |
1da177e4 | 2153 | |
bbd6ef87 PM |
2154 | switch (po->tp_version) { |
2155 | case TPACKET_V1: | |
2156 | po->tp_hdrlen = TPACKET_HDRLEN; | |
2157 | break; | |
2158 | case TPACKET_V2: | |
2159 | po->tp_hdrlen = TPACKET2_HDRLEN; | |
2160 | break; | |
2161 | } | |
2162 | ||
69e3c75f | 2163 | err = -EINVAL; |
4ebf0ae2 | 2164 | if (unlikely((int)req->tp_block_size <= 0)) |
69e3c75f | 2165 | goto out; |
4ebf0ae2 | 2166 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
69e3c75f | 2167 | goto out; |
8913336a | 2168 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
69e3c75f JB |
2169 | po->tp_reserve)) |
2170 | goto out; | |
4ebf0ae2 | 2171 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
69e3c75f | 2172 | goto out; |
1da177e4 | 2173 | |
69e3c75f JB |
2174 | rb->frames_per_block = req->tp_block_size/req->tp_frame_size; |
2175 | if (unlikely(rb->frames_per_block <= 0)) | |
2176 | goto out; | |
2177 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != | |
2178 | req->tp_frame_nr)) | |
2179 | goto out; | |
1da177e4 LT |
2180 | |
2181 | err = -ENOMEM; | |
4ebf0ae2 DM |
2182 | order = get_order(req->tp_block_size); |
2183 | pg_vec = alloc_pg_vec(req, order); | |
2184 | if (unlikely(!pg_vec)) | |
1da177e4 | 2185 | goto out; |
69e3c75f JB |
2186 | } |
2187 | /* Done */ | |
2188 | else { | |
2189 | err = -EINVAL; | |
4ebf0ae2 | 2190 | if (unlikely(req->tp_frame_nr)) |
69e3c75f | 2191 | goto out; |
1da177e4 LT |
2192 | } |
2193 | ||
2194 | lock_sock(sk); | |
2195 | ||
2196 | /* Detach socket from network */ | |
2197 | spin_lock(&po->bind_lock); | |
2198 | was_running = po->running; | |
2199 | num = po->num; | |
2200 | if (was_running) { | |
2201 | __dev_remove_pack(&po->prot_hook); | |
2202 | po->num = 0; | |
2203 | po->running = 0; | |
2204 | __sock_put(sk); | |
2205 | } | |
2206 | spin_unlock(&po->bind_lock); | |
1ce4f28b | 2207 | |
1da177e4 LT |
2208 | synchronize_net(); |
2209 | ||
2210 | err = -EBUSY; | |
905db440 | 2211 | mutex_lock(&po->pg_vec_lock); |
1da177e4 LT |
2212 | if (closing || atomic_read(&po->mapped) == 0) { |
2213 | err = 0; | |
2214 | #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) | |
69e3c75f JB |
2215 | spin_lock_bh(&rb_queue->lock); |
2216 | pg_vec = XC(rb->pg_vec, pg_vec); | |
2217 | rb->frame_max = (req->tp_frame_nr - 1); | |
2218 | rb->head = 0; | |
2219 | rb->frame_size = req->tp_frame_size; | |
2220 | spin_unlock_bh(&rb_queue->lock); | |
2221 | ||
2222 | order = XC(rb->pg_vec_order, order); | |
2223 | req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr); | |
2224 | ||
2225 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
2226 | po->prot_hook.func = (po->rx_ring.pg_vec) ? | |
2227 | tpacket_rcv : packet_rcv; | |
2228 | skb_queue_purge(rb_queue); | |
1da177e4 LT |
2229 | #undef XC |
2230 | if (atomic_read(&po->mapped)) | |
40d4e3df ED |
2231 | pr_err("packet_mmap: vma is busy: %d\n", |
2232 | atomic_read(&po->mapped)); | |
1da177e4 | 2233 | } |
905db440 | 2234 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2235 | |
2236 | spin_lock(&po->bind_lock); | |
2237 | if (was_running && !po->running) { | |
2238 | sock_hold(sk); | |
2239 | po->running = 1; | |
2240 | po->num = num; | |
2241 | dev_add_pack(&po->prot_hook); | |
2242 | } | |
2243 | spin_unlock(&po->bind_lock); | |
2244 | ||
2245 | release_sock(sk); | |
2246 | ||
1da177e4 LT |
2247 | if (pg_vec) |
2248 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
2249 | out: | |
2250 | return err; | |
2251 | } | |
2252 | ||
69e3c75f JB |
2253 | static int packet_mmap(struct file *file, struct socket *sock, |
2254 | struct vm_area_struct *vma) | |
1da177e4 LT |
2255 | { |
2256 | struct sock *sk = sock->sk; | |
2257 | struct packet_sock *po = pkt_sk(sk); | |
69e3c75f JB |
2258 | unsigned long size, expected_size; |
2259 | struct packet_ring_buffer *rb; | |
1da177e4 LT |
2260 | unsigned long start; |
2261 | int err = -EINVAL; | |
2262 | int i; | |
2263 | ||
2264 | if (vma->vm_pgoff) | |
2265 | return -EINVAL; | |
2266 | ||
905db440 | 2267 | mutex_lock(&po->pg_vec_lock); |
69e3c75f JB |
2268 | |
2269 | expected_size = 0; | |
2270 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { | |
2271 | if (rb->pg_vec) { | |
2272 | expected_size += rb->pg_vec_len | |
2273 | * rb->pg_vec_pages | |
2274 | * PAGE_SIZE; | |
2275 | } | |
2276 | } | |
2277 | ||
2278 | if (expected_size == 0) | |
1da177e4 | 2279 | goto out; |
69e3c75f JB |
2280 | |
2281 | size = vma->vm_end - vma->vm_start; | |
2282 | if (size != expected_size) | |
1da177e4 LT |
2283 | goto out; |
2284 | ||
1da177e4 | 2285 | start = vma->vm_start; |
69e3c75f JB |
2286 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
2287 | if (rb->pg_vec == NULL) | |
2288 | continue; | |
2289 | ||
2290 | for (i = 0; i < rb->pg_vec_len; i++) { | |
2291 | struct page *page = virt_to_page(rb->pg_vec[i]); | |
2292 | int pg_num; | |
2293 | ||
2294 | for (pg_num = 0; pg_num < rb->pg_vec_pages; | |
40d4e3df | 2295 | pg_num++, page++) { |
69e3c75f JB |
2296 | err = vm_insert_page(vma, start, page); |
2297 | if (unlikely(err)) | |
2298 | goto out; | |
2299 | start += PAGE_SIZE; | |
2300 | } | |
4ebf0ae2 | 2301 | } |
1da177e4 | 2302 | } |
69e3c75f | 2303 | |
4ebf0ae2 | 2304 | atomic_inc(&po->mapped); |
1da177e4 LT |
2305 | vma->vm_ops = &packet_mmap_ops; |
2306 | err = 0; | |
2307 | ||
2308 | out: | |
905db440 | 2309 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2310 | return err; |
2311 | } | |
2312 | #endif | |
2313 | ||
2314 | ||
90ddc4f0 | 2315 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
2316 | .family = PF_PACKET, |
2317 | .owner = THIS_MODULE, | |
2318 | .release = packet_release, | |
2319 | .bind = packet_bind_spkt, | |
2320 | .connect = sock_no_connect, | |
2321 | .socketpair = sock_no_socketpair, | |
2322 | .accept = sock_no_accept, | |
2323 | .getname = packet_getname_spkt, | |
2324 | .poll = datagram_poll, | |
2325 | .ioctl = packet_ioctl, | |
2326 | .listen = sock_no_listen, | |
2327 | .shutdown = sock_no_shutdown, | |
2328 | .setsockopt = sock_no_setsockopt, | |
2329 | .getsockopt = sock_no_getsockopt, | |
2330 | .sendmsg = packet_sendmsg_spkt, | |
2331 | .recvmsg = packet_recvmsg, | |
2332 | .mmap = sock_no_mmap, | |
2333 | .sendpage = sock_no_sendpage, | |
2334 | }; | |
1da177e4 | 2335 | |
90ddc4f0 | 2336 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
2337 | .family = PF_PACKET, |
2338 | .owner = THIS_MODULE, | |
2339 | .release = packet_release, | |
2340 | .bind = packet_bind, | |
2341 | .connect = sock_no_connect, | |
2342 | .socketpair = sock_no_socketpair, | |
2343 | .accept = sock_no_accept, | |
1ce4f28b | 2344 | .getname = packet_getname, |
1da177e4 LT |
2345 | .poll = packet_poll, |
2346 | .ioctl = packet_ioctl, | |
2347 | .listen = sock_no_listen, | |
2348 | .shutdown = sock_no_shutdown, | |
2349 | .setsockopt = packet_setsockopt, | |
2350 | .getsockopt = packet_getsockopt, | |
2351 | .sendmsg = packet_sendmsg, | |
2352 | .recvmsg = packet_recvmsg, | |
2353 | .mmap = packet_mmap, | |
2354 | .sendpage = sock_no_sendpage, | |
2355 | }; | |
2356 | ||
ec1b4cf7 | 2357 | static const struct net_proto_family packet_family_ops = { |
1da177e4 LT |
2358 | .family = PF_PACKET, |
2359 | .create = packet_create, | |
2360 | .owner = THIS_MODULE, | |
2361 | }; | |
2362 | ||
2363 | static struct notifier_block packet_netdev_notifier = { | |
40d4e3df | 2364 | .notifier_call = packet_notifier, |
1da177e4 LT |
2365 | }; |
2366 | ||
2367 | #ifdef CONFIG_PROC_FS | |
d12d01d6 | 2368 | static inline struct sock *packet_seq_idx(struct net *net, loff_t off) |
1da177e4 LT |
2369 | { |
2370 | struct sock *s; | |
2371 | struct hlist_node *node; | |
2372 | ||
2aaef4e4 | 2373 | sk_for_each(s, node, &net->packet.sklist) { |
1da177e4 LT |
2374 | if (!off--) |
2375 | return s; | |
2376 | } | |
2377 | return NULL; | |
2378 | } | |
2379 | ||
2380 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
40ccbf52 | 2381 | __acquires(seq_file_net(seq)->packet.sklist_lock) |
1da177e4 | 2382 | { |
e372c414 | 2383 | struct net *net = seq_file_net(seq); |
2aaef4e4 | 2384 | read_lock(&net->packet.sklist_lock); |
d12d01d6 | 2385 | return *pos ? packet_seq_idx(net, *pos - 1) : SEQ_START_TOKEN; |
1da177e4 LT |
2386 | } |
2387 | ||
2388 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2389 | { | |
1bf40954 | 2390 | struct net *net = seq_file_net(seq); |
1da177e4 | 2391 | ++*pos; |
1ce4f28b | 2392 | return (v == SEQ_START_TOKEN) |
2aaef4e4 | 2393 | ? sk_head(&net->packet.sklist) |
40d4e3df | 2394 | : sk_next((struct sock *)v) ; |
1da177e4 LT |
2395 | } |
2396 | ||
2397 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
40ccbf52 | 2398 | __releases(seq_file_net(seq)->packet.sklist_lock) |
1da177e4 | 2399 | { |
1bf40954 | 2400 | struct net *net = seq_file_net(seq); |
2aaef4e4 | 2401 | read_unlock(&net->packet.sklist_lock); |
1da177e4 LT |
2402 | } |
2403 | ||
1ce4f28b | 2404 | static int packet_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
2405 | { |
2406 | if (v == SEQ_START_TOKEN) | |
2407 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
2408 | else { | |
2409 | struct sock *s = v; | |
2410 | const struct packet_sock *po = pkt_sk(s); | |
2411 | ||
2412 | seq_printf(seq, | |
2413 | "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", | |
2414 | s, | |
2415 | atomic_read(&s->sk_refcnt), | |
2416 | s->sk_type, | |
2417 | ntohs(po->num), | |
2418 | po->ifindex, | |
2419 | po->running, | |
2420 | atomic_read(&s->sk_rmem_alloc), | |
2421 | sock_i_uid(s), | |
40d4e3df | 2422 | sock_i_ino(s)); |
1da177e4 LT |
2423 | } |
2424 | ||
2425 | return 0; | |
2426 | } | |
2427 | ||
56b3d975 | 2428 | static const struct seq_operations packet_seq_ops = { |
1da177e4 LT |
2429 | .start = packet_seq_start, |
2430 | .next = packet_seq_next, | |
2431 | .stop = packet_seq_stop, | |
2432 | .show = packet_seq_show, | |
2433 | }; | |
2434 | ||
2435 | static int packet_seq_open(struct inode *inode, struct file *file) | |
2436 | { | |
e372c414 DL |
2437 | return seq_open_net(inode, file, &packet_seq_ops, |
2438 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2439 | } |
2440 | ||
da7071d7 | 2441 | static const struct file_operations packet_seq_fops = { |
1da177e4 LT |
2442 | .owner = THIS_MODULE, |
2443 | .open = packet_seq_open, | |
2444 | .read = seq_read, | |
2445 | .llseek = seq_lseek, | |
e372c414 | 2446 | .release = seq_release_net, |
1da177e4 LT |
2447 | }; |
2448 | ||
2449 | #endif | |
2450 | ||
d12d01d6 DL |
2451 | static int packet_net_init(struct net *net) |
2452 | { | |
2aaef4e4 DL |
2453 | rwlock_init(&net->packet.sklist_lock); |
2454 | INIT_HLIST_HEAD(&net->packet.sklist); | |
d12d01d6 DL |
2455 | |
2456 | if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops)) | |
2457 | return -ENOMEM; | |
2458 | ||
2459 | return 0; | |
2460 | } | |
2461 | ||
2462 | static void packet_net_exit(struct net *net) | |
2463 | { | |
2464 | proc_net_remove(net, "packet"); | |
2465 | } | |
2466 | ||
2467 | static struct pernet_operations packet_net_ops = { | |
2468 | .init = packet_net_init, | |
2469 | .exit = packet_net_exit, | |
2470 | }; | |
2471 | ||
2472 | ||
1da177e4 LT |
2473 | static void __exit packet_exit(void) |
2474 | { | |
1da177e4 | 2475 | unregister_netdevice_notifier(&packet_netdev_notifier); |
d12d01d6 | 2476 | unregister_pernet_subsys(&packet_net_ops); |
1da177e4 LT |
2477 | sock_unregister(PF_PACKET); |
2478 | proto_unregister(&packet_proto); | |
2479 | } | |
2480 | ||
2481 | static int __init packet_init(void) | |
2482 | { | |
2483 | int rc = proto_register(&packet_proto, 0); | |
2484 | ||
2485 | if (rc != 0) | |
2486 | goto out; | |
2487 | ||
2488 | sock_register(&packet_family_ops); | |
d12d01d6 | 2489 | register_pernet_subsys(&packet_net_ops); |
1da177e4 | 2490 | register_netdevice_notifier(&packet_netdev_notifier); |
1da177e4 LT |
2491 | out: |
2492 | return rc; | |
2493 | } | |
2494 | ||
2495 | module_init(packet_init); | |
2496 | module_exit(packet_exit); | |
2497 | MODULE_LICENSE("GPL"); | |
2498 | MODULE_ALIAS_NETPROTO(PF_PACKET); |