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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> |
1da177e4 LT |
82 | |
83 | #ifdef CONFIG_INET | |
84 | #include <net/inet_common.h> | |
85 | #endif | |
86 | ||
1da177e4 LT |
87 | /* |
88 | Assumptions: | |
89 | - if device has no dev->hard_header routine, it adds and removes ll header | |
90 | inside itself. In this case ll header is invisible outside of device, | |
91 | but higher levels still should reserve dev->hard_header_len. | |
92 | Some devices are enough clever to reallocate skb, when header | |
93 | will not fit to reserved space (tunnel), another ones are silly | |
94 | (PPP). | |
95 | - packet socket receives packets with pulled ll header, | |
96 | so that SOCK_RAW should push it back. | |
97 | ||
98 | On receive: | |
99 | ----------- | |
100 | ||
101 | Incoming, dev->hard_header!=NULL | |
b0e380b1 ACM |
102 | mac_header -> ll header |
103 | data -> data | |
1da177e4 LT |
104 | |
105 | Outgoing, dev->hard_header!=NULL | |
b0e380b1 ACM |
106 | mac_header -> ll header |
107 | data -> ll header | |
1da177e4 LT |
108 | |
109 | Incoming, dev->hard_header==NULL | |
b0e380b1 ACM |
110 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
111 | header. PPP makes it, that is wrong, because introduce | |
db0c58f9 | 112 | assymetry between rx and tx paths. |
b0e380b1 | 113 | data -> data |
1da177e4 LT |
114 | |
115 | Outgoing, dev->hard_header==NULL | |
b0e380b1 ACM |
116 | mac_header -> data. ll header is still not built! |
117 | data -> data | |
1da177e4 LT |
118 | |
119 | Resume | |
120 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. | |
121 | ||
122 | ||
123 | On transmit: | |
124 | ------------ | |
125 | ||
126 | dev->hard_header != NULL | |
b0e380b1 ACM |
127 | mac_header -> ll header |
128 | data -> ll header | |
1da177e4 LT |
129 | |
130 | dev->hard_header == NULL (ll header is added by device, we cannot control it) | |
b0e380b1 ACM |
131 | mac_header -> data |
132 | data -> data | |
1da177e4 LT |
133 | |
134 | We should set nh.raw on output to correct posistion, | |
135 | packet classifier depends on it. | |
136 | */ | |
137 | ||
1da177e4 LT |
138 | /* Private packet socket structures. */ |
139 | ||
40d4e3df | 140 | struct packet_mclist { |
1da177e4 LT |
141 | struct packet_mclist *next; |
142 | int ifindex; | |
143 | int count; | |
144 | unsigned short type; | |
145 | unsigned short alen; | |
0fb375fb EB |
146 | unsigned char addr[MAX_ADDR_LEN]; |
147 | }; | |
148 | /* identical to struct packet_mreq except it has | |
149 | * a longer address field. | |
150 | */ | |
40d4e3df | 151 | struct packet_mreq_max { |
0fb375fb EB |
152 | int mr_ifindex; |
153 | unsigned short mr_type; | |
154 | unsigned short mr_alen; | |
155 | unsigned char mr_address[MAX_ADDR_LEN]; | |
1da177e4 | 156 | }; |
a2efcfa0 | 157 | |
1da177e4 | 158 | #ifdef CONFIG_PACKET_MMAP |
69e3c75f JB |
159 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
160 | int closing, int tx_ring); | |
161 | ||
162 | struct packet_ring_buffer { | |
40d4e3df | 163 | char **pg_vec; |
69e3c75f JB |
164 | unsigned int head; |
165 | unsigned int frames_per_block; | |
166 | unsigned int frame_size; | |
167 | unsigned int frame_max; | |
168 | ||
169 | unsigned int pg_vec_order; | |
170 | unsigned int pg_vec_pages; | |
171 | unsigned int pg_vec_len; | |
172 | ||
173 | atomic_t pending; | |
174 | }; | |
175 | ||
176 | struct packet_sock; | |
177 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg); | |
1da177e4 LT |
178 | #endif |
179 | ||
180 | static void packet_flush_mclist(struct sock *sk); | |
181 | ||
182 | struct packet_sock { | |
183 | /* struct sock has to be the first member of packet_sock */ | |
184 | struct sock sk; | |
185 | struct tpacket_stats stats; | |
186 | #ifdef CONFIG_PACKET_MMAP | |
69e3c75f JB |
187 | struct packet_ring_buffer rx_ring; |
188 | struct packet_ring_buffer tx_ring; | |
1da177e4 LT |
189 | int copy_thresh; |
190 | #endif | |
1da177e4 | 191 | spinlock_t bind_lock; |
905db440 | 192 | struct mutex pg_vec_lock; |
8dc41944 | 193 | unsigned int running:1, /* prot_hook is attached*/ |
80feaacb PWJ |
194 | auxdata:1, |
195 | origdev:1; | |
1da177e4 | 196 | int ifindex; /* bound device */ |
0e11c91e | 197 | __be16 num; |
1da177e4 | 198 | struct packet_mclist *mclist; |
1da177e4 LT |
199 | #ifdef CONFIG_PACKET_MMAP |
200 | atomic_t mapped; | |
bbd6ef87 PM |
201 | enum tpacket_versions tp_version; |
202 | unsigned int tp_hdrlen; | |
8913336a | 203 | unsigned int tp_reserve; |
69e3c75f | 204 | unsigned int tp_loss:1; |
1da177e4 | 205 | #endif |
94b05952 | 206 | struct packet_type prot_hook ____cacheline_aligned_in_smp; |
1da177e4 LT |
207 | }; |
208 | ||
ffbc6111 HX |
209 | struct packet_skb_cb { |
210 | unsigned int origlen; | |
211 | union { | |
212 | struct sockaddr_pkt pkt; | |
213 | struct sockaddr_ll ll; | |
214 | } sa; | |
215 | }; | |
216 | ||
217 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) | |
8dc41944 | 218 | |
1da177e4 LT |
219 | #ifdef CONFIG_PACKET_MMAP |
220 | ||
69e3c75f | 221 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
1da177e4 | 222 | { |
bbd6ef87 PM |
223 | union { |
224 | struct tpacket_hdr *h1; | |
225 | struct tpacket2_hdr *h2; | |
226 | void *raw; | |
227 | } h; | |
1da177e4 | 228 | |
69e3c75f | 229 | h.raw = frame; |
bbd6ef87 PM |
230 | switch (po->tp_version) { |
231 | case TPACKET_V1: | |
69e3c75f JB |
232 | h.h1->tp_status = status; |
233 | flush_dcache_page(virt_to_page(&h.h1->tp_status)); | |
bbd6ef87 PM |
234 | break; |
235 | case TPACKET_V2: | |
69e3c75f JB |
236 | h.h2->tp_status = status; |
237 | flush_dcache_page(virt_to_page(&h.h2->tp_status)); | |
bbd6ef87 | 238 | break; |
69e3c75f | 239 | default: |
40d4e3df | 240 | pr_err("TPACKET version not supported\n"); |
69e3c75f | 241 | BUG(); |
bbd6ef87 | 242 | } |
69e3c75f JB |
243 | |
244 | smp_wmb(); | |
bbd6ef87 PM |
245 | } |
246 | ||
69e3c75f | 247 | static int __packet_get_status(struct packet_sock *po, void *frame) |
bbd6ef87 PM |
248 | { |
249 | union { | |
250 | struct tpacket_hdr *h1; | |
251 | struct tpacket2_hdr *h2; | |
252 | void *raw; | |
253 | } h; | |
254 | ||
69e3c75f JB |
255 | smp_rmb(); |
256 | ||
bbd6ef87 PM |
257 | h.raw = frame; |
258 | switch (po->tp_version) { | |
259 | case TPACKET_V1: | |
69e3c75f JB |
260 | flush_dcache_page(virt_to_page(&h.h1->tp_status)); |
261 | return h.h1->tp_status; | |
bbd6ef87 | 262 | case TPACKET_V2: |
69e3c75f JB |
263 | flush_dcache_page(virt_to_page(&h.h2->tp_status)); |
264 | return h.h2->tp_status; | |
265 | default: | |
40d4e3df | 266 | pr_err("TPACKET version not supported\n"); |
69e3c75f JB |
267 | BUG(); |
268 | return 0; | |
bbd6ef87 | 269 | } |
1da177e4 | 270 | } |
69e3c75f JB |
271 | |
272 | static void *packet_lookup_frame(struct packet_sock *po, | |
273 | struct packet_ring_buffer *rb, | |
274 | unsigned int position, | |
275 | int status) | |
276 | { | |
277 | unsigned int pg_vec_pos, frame_offset; | |
278 | union { | |
279 | struct tpacket_hdr *h1; | |
280 | struct tpacket2_hdr *h2; | |
281 | void *raw; | |
282 | } h; | |
283 | ||
284 | pg_vec_pos = position / rb->frames_per_block; | |
285 | frame_offset = position % rb->frames_per_block; | |
286 | ||
287 | h.raw = rb->pg_vec[pg_vec_pos] + (frame_offset * rb->frame_size); | |
288 | ||
289 | if (status != __packet_get_status(po, h.raw)) | |
290 | return NULL; | |
291 | ||
292 | return h.raw; | |
293 | } | |
294 | ||
295 | static inline void *packet_current_frame(struct packet_sock *po, | |
296 | struct packet_ring_buffer *rb, | |
297 | int status) | |
298 | { | |
299 | return packet_lookup_frame(po, rb, rb->head, status); | |
300 | } | |
301 | ||
302 | static inline void *packet_previous_frame(struct packet_sock *po, | |
303 | struct packet_ring_buffer *rb, | |
304 | int status) | |
305 | { | |
306 | unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; | |
307 | return packet_lookup_frame(po, rb, previous, status); | |
308 | } | |
309 | ||
310 | static inline void packet_increment_head(struct packet_ring_buffer *buff) | |
311 | { | |
312 | buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; | |
313 | } | |
314 | ||
1da177e4 LT |
315 | #endif |
316 | ||
317 | static inline struct packet_sock *pkt_sk(struct sock *sk) | |
318 | { | |
319 | return (struct packet_sock *)sk; | |
320 | } | |
321 | ||
322 | static void packet_sock_destruct(struct sock *sk) | |
323 | { | |
547b792c IJ |
324 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
325 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); | |
1da177e4 LT |
326 | |
327 | if (!sock_flag(sk, SOCK_DEAD)) { | |
40d4e3df | 328 | pr_err("Attempt to release alive packet socket: %p\n", sk); |
1da177e4 LT |
329 | return; |
330 | } | |
331 | ||
17ab56a2 | 332 | sk_refcnt_debug_dec(sk); |
1da177e4 LT |
333 | } |
334 | ||
335 | ||
90ddc4f0 | 336 | static const struct proto_ops packet_ops; |
1da177e4 | 337 | |
90ddc4f0 | 338 | static const struct proto_ops packet_ops_spkt; |
1da177e4 | 339 | |
40d4e3df ED |
340 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
341 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
342 | { |
343 | struct sock *sk; | |
344 | struct sockaddr_pkt *spkt; | |
345 | ||
346 | /* | |
347 | * When we registered the protocol we saved the socket in the data | |
348 | * field for just this event. | |
349 | */ | |
350 | ||
351 | sk = pt->af_packet_priv; | |
1ce4f28b | 352 | |
1da177e4 LT |
353 | /* |
354 | * Yank back the headers [hope the device set this | |
355 | * right or kerboom...] | |
356 | * | |
357 | * Incoming packets have ll header pulled, | |
358 | * push it back. | |
359 | * | |
98e399f8 | 360 | * For outgoing ones skb->data == skb_mac_header(skb) |
1da177e4 LT |
361 | * so that this procedure is noop. |
362 | */ | |
363 | ||
364 | if (skb->pkt_type == PACKET_LOOPBACK) | |
365 | goto out; | |
366 | ||
3b1e0a65 | 367 | if (dev_net(dev) != sock_net(sk)) |
d12d01d6 DL |
368 | goto out; |
369 | ||
40d4e3df ED |
370 | skb = skb_share_check(skb, GFP_ATOMIC); |
371 | if (skb == NULL) | |
1da177e4 LT |
372 | goto oom; |
373 | ||
374 | /* drop any routing info */ | |
adf30907 | 375 | skb_dst_drop(skb); |
1da177e4 | 376 | |
84531c24 PO |
377 | /* drop conntrack reference */ |
378 | nf_reset(skb); | |
379 | ||
ffbc6111 | 380 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
1da177e4 | 381 | |
98e399f8 | 382 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
383 | |
384 | /* | |
385 | * The SOCK_PACKET socket receives _all_ frames. | |
386 | */ | |
387 | ||
388 | spkt->spkt_family = dev->type; | |
389 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
390 | spkt->spkt_protocol = skb->protocol; | |
391 | ||
392 | /* | |
393 | * Charge the memory to the socket. This is done specifically | |
394 | * to prevent sockets using all the memory up. | |
395 | */ | |
396 | ||
40d4e3df | 397 | if (sock_queue_rcv_skb(sk, skb) == 0) |
1da177e4 LT |
398 | return 0; |
399 | ||
400 | out: | |
401 | kfree_skb(skb); | |
402 | oom: | |
403 | return 0; | |
404 | } | |
405 | ||
406 | ||
407 | /* | |
408 | * Output a raw packet to a device layer. This bypasses all the other | |
409 | * protocol layers and you must therefore supply it with a complete frame | |
410 | */ | |
1ce4f28b | 411 | |
1da177e4 LT |
412 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, |
413 | struct msghdr *msg, size_t len) | |
414 | { | |
415 | struct sock *sk = sock->sk; | |
40d4e3df | 416 | struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name; |
1da177e4 LT |
417 | struct sk_buff *skb; |
418 | struct net_device *dev; | |
40d4e3df | 419 | __be16 proto = 0; |
1da177e4 | 420 | int err; |
1ce4f28b | 421 | |
1da177e4 | 422 | /* |
1ce4f28b | 423 | * Get and verify the address. |
1da177e4 LT |
424 | */ |
425 | ||
40d4e3df | 426 | if (saddr) { |
1da177e4 | 427 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
40d4e3df ED |
428 | return -EINVAL; |
429 | if (msg->msg_namelen == sizeof(struct sockaddr_pkt)) | |
430 | proto = saddr->spkt_protocol; | |
431 | } else | |
432 | return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */ | |
1da177e4 LT |
433 | |
434 | /* | |
1ce4f28b | 435 | * Find the device first to size check it |
1da177e4 LT |
436 | */ |
437 | ||
438 | saddr->spkt_device[13] = 0; | |
3b1e0a65 | 439 | dev = dev_get_by_name(sock_net(sk), saddr->spkt_device); |
1da177e4 LT |
440 | err = -ENODEV; |
441 | if (dev == NULL) | |
442 | goto out_unlock; | |
1ce4f28b | 443 | |
d5e76b0a DM |
444 | err = -ENETDOWN; |
445 | if (!(dev->flags & IFF_UP)) | |
446 | goto out_unlock; | |
447 | ||
1da177e4 | 448 | /* |
40d4e3df ED |
449 | * You may not queue a frame bigger than the mtu. This is the lowest level |
450 | * raw protocol and you must do your own fragmentation at this level. | |
1da177e4 | 451 | */ |
1ce4f28b | 452 | |
1da177e4 | 453 | err = -EMSGSIZE; |
8ae55f04 | 454 | if (len > dev->mtu + dev->hard_header_len) |
1da177e4 LT |
455 | goto out_unlock; |
456 | ||
457 | err = -ENOBUFS; | |
458 | skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL); | |
459 | ||
460 | /* | |
40d4e3df ED |
461 | * If the write buffer is full, then tough. At this level the user |
462 | * gets to deal with the problem - do your own algorithmic backoffs. | |
463 | * That's far more flexible. | |
1da177e4 | 464 | */ |
1ce4f28b YH |
465 | |
466 | if (skb == NULL) | |
1da177e4 LT |
467 | goto out_unlock; |
468 | ||
469 | /* | |
1ce4f28b | 470 | * Fill it in |
1da177e4 | 471 | */ |
1ce4f28b | 472 | |
1da177e4 LT |
473 | /* FIXME: Save some space for broken drivers that write a |
474 | * hard header at transmission time by themselves. PPP is the | |
475 | * notable one here. This should really be fixed at the driver level. | |
476 | */ | |
477 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
c1d2bbe1 | 478 | skb_reset_network_header(skb); |
1da177e4 LT |
479 | |
480 | /* Try to align data part correctly */ | |
3b04ddde | 481 | if (dev->header_ops) { |
1da177e4 LT |
482 | skb->data -= dev->hard_header_len; |
483 | skb->tail -= dev->hard_header_len; | |
484 | if (len < dev->hard_header_len) | |
c1d2bbe1 | 485 | skb_reset_network_header(skb); |
1da177e4 LT |
486 | } |
487 | ||
488 | /* Returns -EFAULT on error */ | |
40d4e3df | 489 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
1da177e4 LT |
490 | skb->protocol = proto; |
491 | skb->dev = dev; | |
492 | skb->priority = sk->sk_priority; | |
2d37a186 | 493 | skb->mark = sk->sk_mark; |
1da177e4 LT |
494 | if (err) |
495 | goto out_free; | |
496 | ||
1da177e4 LT |
497 | /* |
498 | * Now send it | |
499 | */ | |
500 | ||
501 | dev_queue_xmit(skb); | |
502 | dev_put(dev); | |
40d4e3df | 503 | return len; |
1da177e4 LT |
504 | |
505 | out_free: | |
506 | kfree_skb(skb); | |
507 | out_unlock: | |
508 | if (dev) | |
509 | dev_put(dev); | |
510 | return err; | |
511 | } | |
1da177e4 | 512 | |
dbcb5855 DM |
513 | static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk, |
514 | unsigned int res) | |
1da177e4 LT |
515 | { |
516 | struct sk_filter *filter; | |
fda9ef5d DM |
517 | |
518 | rcu_read_lock_bh(); | |
519 | filter = rcu_dereference(sk->sk_filter); | |
dbcb5855 DM |
520 | if (filter != NULL) |
521 | res = sk_run_filter(skb, filter->insns, filter->len); | |
fda9ef5d | 522 | rcu_read_unlock_bh(); |
1da177e4 | 523 | |
dbcb5855 | 524 | return res; |
1da177e4 LT |
525 | } |
526 | ||
527 | /* | |
528 | This function makes lazy skb cloning in hope that most of packets | |
529 | are discarded by BPF. | |
530 | ||
531 | Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
532 | and skb->cb are mangled. It works because (and until) packets | |
533 | falling here are owned by current CPU. Output packets are cloned | |
534 | by dev_queue_xmit_nit(), input packets are processed by net_bh | |
535 | sequencially, so that if we return skb to original state on exit, | |
536 | we will not harm anyone. | |
537 | */ | |
538 | ||
40d4e3df ED |
539 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
540 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
541 | { |
542 | struct sock *sk; | |
543 | struct sockaddr_ll *sll; | |
544 | struct packet_sock *po; | |
40d4e3df | 545 | u8 *skb_head = skb->data; |
1da177e4 | 546 | int skb_len = skb->len; |
dbcb5855 | 547 | unsigned int snaplen, res; |
1da177e4 LT |
548 | |
549 | if (skb->pkt_type == PACKET_LOOPBACK) | |
550 | goto drop; | |
551 | ||
552 | sk = pt->af_packet_priv; | |
553 | po = pkt_sk(sk); | |
554 | ||
3b1e0a65 | 555 | if (dev_net(dev) != sock_net(sk)) |
d12d01d6 DL |
556 | goto drop; |
557 | ||
1da177e4 LT |
558 | skb->dev = dev; |
559 | ||
3b04ddde | 560 | if (dev->header_ops) { |
1da177e4 LT |
561 | /* The device has an explicit notion of ll header, |
562 | exported to higher levels. | |
563 | ||
564 | Otherwise, the device hides datails of it frame | |
565 | structure, so that corresponding packet head | |
566 | never delivered to user. | |
567 | */ | |
568 | if (sk->sk_type != SOCK_DGRAM) | |
98e399f8 | 569 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
570 | else if (skb->pkt_type == PACKET_OUTGOING) { |
571 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 572 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
573 | } |
574 | } | |
575 | ||
576 | snaplen = skb->len; | |
577 | ||
dbcb5855 DM |
578 | res = run_filter(skb, sk, snaplen); |
579 | if (!res) | |
fda9ef5d | 580 | goto drop_n_restore; |
dbcb5855 DM |
581 | if (snaplen > res) |
582 | snaplen = res; | |
1da177e4 LT |
583 | |
584 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
585 | (unsigned)sk->sk_rcvbuf) | |
586 | goto drop_n_acct; | |
587 | ||
588 | if (skb_shared(skb)) { | |
589 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
590 | if (nskb == NULL) | |
591 | goto drop_n_acct; | |
592 | ||
593 | if (skb_head != skb->data) { | |
594 | skb->data = skb_head; | |
595 | skb->len = skb_len; | |
596 | } | |
597 | kfree_skb(skb); | |
598 | skb = nskb; | |
599 | } | |
600 | ||
ffbc6111 HX |
601 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
602 | sizeof(skb->cb)); | |
603 | ||
604 | sll = &PACKET_SKB_CB(skb)->sa.ll; | |
1da177e4 LT |
605 | sll->sll_family = AF_PACKET; |
606 | sll->sll_hatype = dev->type; | |
607 | sll->sll_protocol = skb->protocol; | |
608 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 609 | if (unlikely(po->origdev)) |
80feaacb PWJ |
610 | sll->sll_ifindex = orig_dev->ifindex; |
611 | else | |
612 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 613 | |
b95cce35 | 614 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 | 615 | |
ffbc6111 | 616 | PACKET_SKB_CB(skb)->origlen = skb->len; |
8dc41944 | 617 | |
1da177e4 LT |
618 | if (pskb_trim(skb, snaplen)) |
619 | goto drop_n_acct; | |
620 | ||
621 | skb_set_owner_r(skb, sk); | |
622 | skb->dev = NULL; | |
adf30907 | 623 | skb_dst_drop(skb); |
1da177e4 | 624 | |
84531c24 PO |
625 | /* drop conntrack reference */ |
626 | nf_reset(skb); | |
627 | ||
1da177e4 LT |
628 | spin_lock(&sk->sk_receive_queue.lock); |
629 | po->stats.tp_packets++; | |
3b885787 | 630 | skb->dropcount = atomic_read(&sk->sk_drops); |
1da177e4 LT |
631 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
632 | spin_unlock(&sk->sk_receive_queue.lock); | |
633 | sk->sk_data_ready(sk, skb->len); | |
634 | return 0; | |
635 | ||
636 | drop_n_acct: | |
3b885787 | 637 | po->stats.tp_drops = atomic_inc_return(&sk->sk_drops); |
1da177e4 LT |
638 | |
639 | drop_n_restore: | |
640 | if (skb_head != skb->data && skb_shared(skb)) { | |
641 | skb->data = skb_head; | |
642 | skb->len = skb_len; | |
643 | } | |
644 | drop: | |
ead2ceb0 | 645 | consume_skb(skb); |
1da177e4 LT |
646 | return 0; |
647 | } | |
648 | ||
649 | #ifdef CONFIG_PACKET_MMAP | |
40d4e3df ED |
650 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
651 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
652 | { |
653 | struct sock *sk; | |
654 | struct packet_sock *po; | |
655 | struct sockaddr_ll *sll; | |
bbd6ef87 PM |
656 | union { |
657 | struct tpacket_hdr *h1; | |
658 | struct tpacket2_hdr *h2; | |
659 | void *raw; | |
660 | } h; | |
40d4e3df | 661 | u8 *skb_head = skb->data; |
1da177e4 | 662 | int skb_len = skb->len; |
dbcb5855 | 663 | unsigned int snaplen, res; |
1da177e4 | 664 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
bbd6ef87 | 665 | unsigned short macoff, netoff, hdrlen; |
1da177e4 | 666 | struct sk_buff *copy_skb = NULL; |
b7aa0bf7 | 667 | struct timeval tv; |
bbd6ef87 | 668 | struct timespec ts; |
1da177e4 LT |
669 | |
670 | if (skb->pkt_type == PACKET_LOOPBACK) | |
671 | goto drop; | |
672 | ||
673 | sk = pt->af_packet_priv; | |
674 | po = pkt_sk(sk); | |
675 | ||
3b1e0a65 | 676 | if (dev_net(dev) != sock_net(sk)) |
d12d01d6 DL |
677 | goto drop; |
678 | ||
3b04ddde | 679 | if (dev->header_ops) { |
1da177e4 | 680 | if (sk->sk_type != SOCK_DGRAM) |
98e399f8 | 681 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
682 | else if (skb->pkt_type == PACKET_OUTGOING) { |
683 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 684 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
685 | } |
686 | } | |
687 | ||
8dc41944 HX |
688 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
689 | status |= TP_STATUS_CSUMNOTREADY; | |
690 | ||
1da177e4 LT |
691 | snaplen = skb->len; |
692 | ||
dbcb5855 DM |
693 | res = run_filter(skb, sk, snaplen); |
694 | if (!res) | |
fda9ef5d | 695 | goto drop_n_restore; |
dbcb5855 DM |
696 | if (snaplen > res) |
697 | snaplen = res; | |
1da177e4 LT |
698 | |
699 | if (sk->sk_type == SOCK_DGRAM) { | |
8913336a PM |
700 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
701 | po->tp_reserve; | |
1da177e4 | 702 | } else { |
bbe735e4 | 703 | unsigned maclen = skb_network_offset(skb); |
bbd6ef87 | 704 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
8913336a PM |
705 | (maclen < 16 ? 16 : maclen)) + |
706 | po->tp_reserve; | |
1da177e4 LT |
707 | macoff = netoff - maclen; |
708 | } | |
709 | ||
69e3c75f | 710 | if (macoff + snaplen > po->rx_ring.frame_size) { |
1da177e4 LT |
711 | if (po->copy_thresh && |
712 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < | |
713 | (unsigned)sk->sk_rcvbuf) { | |
714 | if (skb_shared(skb)) { | |
715 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
716 | } else { | |
717 | copy_skb = skb_get(skb); | |
718 | skb_head = skb->data; | |
719 | } | |
720 | if (copy_skb) | |
721 | skb_set_owner_r(copy_skb, sk); | |
722 | } | |
69e3c75f | 723 | snaplen = po->rx_ring.frame_size - macoff; |
1da177e4 LT |
724 | if ((int)snaplen < 0) |
725 | snaplen = 0; | |
726 | } | |
1da177e4 LT |
727 | |
728 | spin_lock(&sk->sk_receive_queue.lock); | |
69e3c75f | 729 | h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL); |
bbd6ef87 | 730 | if (!h.raw) |
1da177e4 | 731 | goto ring_is_full; |
69e3c75f | 732 | packet_increment_head(&po->rx_ring); |
1da177e4 LT |
733 | po->stats.tp_packets++; |
734 | if (copy_skb) { | |
735 | status |= TP_STATUS_COPY; | |
736 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
737 | } | |
738 | if (!po->stats.tp_drops) | |
739 | status &= ~TP_STATUS_LOSING; | |
740 | spin_unlock(&sk->sk_receive_queue.lock); | |
741 | ||
bbd6ef87 | 742 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
1da177e4 | 743 | |
bbd6ef87 PM |
744 | switch (po->tp_version) { |
745 | case TPACKET_V1: | |
746 | h.h1->tp_len = skb->len; | |
747 | h.h1->tp_snaplen = snaplen; | |
748 | h.h1->tp_mac = macoff; | |
749 | h.h1->tp_net = netoff; | |
750 | if (skb->tstamp.tv64) | |
751 | tv = ktime_to_timeval(skb->tstamp); | |
752 | else | |
753 | do_gettimeofday(&tv); | |
754 | h.h1->tp_sec = tv.tv_sec; | |
755 | h.h1->tp_usec = tv.tv_usec; | |
756 | hdrlen = sizeof(*h.h1); | |
757 | break; | |
758 | case TPACKET_V2: | |
759 | h.h2->tp_len = skb->len; | |
760 | h.h2->tp_snaplen = snaplen; | |
761 | h.h2->tp_mac = macoff; | |
762 | h.h2->tp_net = netoff; | |
763 | if (skb->tstamp.tv64) | |
764 | ts = ktime_to_timespec(skb->tstamp); | |
765 | else | |
766 | getnstimeofday(&ts); | |
767 | h.h2->tp_sec = ts.tv_sec; | |
768 | h.h2->tp_nsec = ts.tv_nsec; | |
393e52e3 | 769 | h.h2->tp_vlan_tci = skb->vlan_tci; |
bbd6ef87 PM |
770 | hdrlen = sizeof(*h.h2); |
771 | break; | |
772 | default: | |
773 | BUG(); | |
774 | } | |
1da177e4 | 775 | |
bbd6ef87 | 776 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
b95cce35 | 777 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 LT |
778 | sll->sll_family = AF_PACKET; |
779 | sll->sll_hatype = dev->type; | |
780 | sll->sll_protocol = skb->protocol; | |
781 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 782 | if (unlikely(po->origdev)) |
80feaacb PWJ |
783 | sll->sll_ifindex = orig_dev->ifindex; |
784 | else | |
785 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 786 | |
bbd6ef87 | 787 | __packet_set_status(po, h.raw, status); |
e16aa207 | 788 | smp_mb(); |
1da177e4 LT |
789 | { |
790 | struct page *p_start, *p_end; | |
bbd6ef87 | 791 | u8 *h_end = h.raw + macoff + snaplen - 1; |
1da177e4 | 792 | |
bbd6ef87 | 793 | p_start = virt_to_page(h.raw); |
1da177e4 LT |
794 | p_end = virt_to_page(h_end); |
795 | while (p_start <= p_end) { | |
796 | flush_dcache_page(p_start); | |
797 | p_start++; | |
798 | } | |
799 | } | |
800 | ||
801 | sk->sk_data_ready(sk, 0); | |
802 | ||
803 | drop_n_restore: | |
804 | if (skb_head != skb->data && skb_shared(skb)) { | |
805 | skb->data = skb_head; | |
806 | skb->len = skb_len; | |
807 | } | |
808 | drop: | |
1ce4f28b | 809 | kfree_skb(skb); |
1da177e4 LT |
810 | return 0; |
811 | ||
812 | ring_is_full: | |
813 | po->stats.tp_drops++; | |
814 | spin_unlock(&sk->sk_receive_queue.lock); | |
815 | ||
816 | sk->sk_data_ready(sk, 0); | |
acb5d75b | 817 | kfree_skb(copy_skb); |
1da177e4 LT |
818 | goto drop_n_restore; |
819 | } | |
820 | ||
69e3c75f JB |
821 | static void tpacket_destruct_skb(struct sk_buff *skb) |
822 | { | |
823 | struct packet_sock *po = pkt_sk(skb->sk); | |
40d4e3df | 824 | void *ph; |
1da177e4 | 825 | |
69e3c75f | 826 | BUG_ON(skb == NULL); |
1da177e4 | 827 | |
69e3c75f JB |
828 | if (likely(po->tx_ring.pg_vec)) { |
829 | ph = skb_shinfo(skb)->destructor_arg; | |
830 | BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING); | |
831 | BUG_ON(atomic_read(&po->tx_ring.pending) == 0); | |
832 | atomic_dec(&po->tx_ring.pending); | |
833 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE); | |
834 | } | |
835 | ||
836 | sock_wfree(skb); | |
837 | } | |
838 | ||
40d4e3df ED |
839 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
840 | void *frame, struct net_device *dev, int size_max, | |
841 | __be16 proto, unsigned char *addr) | |
69e3c75f JB |
842 | { |
843 | union { | |
844 | struct tpacket_hdr *h1; | |
845 | struct tpacket2_hdr *h2; | |
846 | void *raw; | |
847 | } ph; | |
848 | int to_write, offset, len, tp_len, nr_frags, len_max; | |
849 | struct socket *sock = po->sk.sk_socket; | |
850 | struct page *page; | |
851 | void *data; | |
852 | int err; | |
853 | ||
854 | ph.raw = frame; | |
855 | ||
856 | skb->protocol = proto; | |
857 | skb->dev = dev; | |
858 | skb->priority = po->sk.sk_priority; | |
2d37a186 | 859 | skb->mark = po->sk.sk_mark; |
69e3c75f JB |
860 | skb_shinfo(skb)->destructor_arg = ph.raw; |
861 | ||
862 | switch (po->tp_version) { | |
863 | case TPACKET_V2: | |
864 | tp_len = ph.h2->tp_len; | |
865 | break; | |
866 | default: | |
867 | tp_len = ph.h1->tp_len; | |
868 | break; | |
869 | } | |
870 | if (unlikely(tp_len > size_max)) { | |
40d4e3df | 871 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); |
69e3c75f JB |
872 | return -EMSGSIZE; |
873 | } | |
874 | ||
875 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
876 | skb_reset_network_header(skb); | |
877 | ||
878 | data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll); | |
879 | to_write = tp_len; | |
880 | ||
881 | if (sock->type == SOCK_DGRAM) { | |
882 | err = dev_hard_header(skb, dev, ntohs(proto), addr, | |
883 | NULL, tp_len); | |
884 | if (unlikely(err < 0)) | |
885 | return -EINVAL; | |
40d4e3df | 886 | } else if (dev->hard_header_len) { |
69e3c75f JB |
887 | /* net device doesn't like empty head */ |
888 | if (unlikely(tp_len <= dev->hard_header_len)) { | |
40d4e3df ED |
889 | pr_err("packet size is too short (%d < %d)\n", |
890 | tp_len, dev->hard_header_len); | |
69e3c75f JB |
891 | return -EINVAL; |
892 | } | |
893 | ||
894 | skb_push(skb, dev->hard_header_len); | |
895 | err = skb_store_bits(skb, 0, data, | |
896 | dev->hard_header_len); | |
897 | if (unlikely(err)) | |
898 | return err; | |
899 | ||
900 | data += dev->hard_header_len; | |
901 | to_write -= dev->hard_header_len; | |
902 | } | |
903 | ||
904 | err = -EFAULT; | |
905 | page = virt_to_page(data); | |
906 | offset = offset_in_page(data); | |
907 | len_max = PAGE_SIZE - offset; | |
908 | len = ((to_write > len_max) ? len_max : to_write); | |
909 | ||
910 | skb->data_len = to_write; | |
911 | skb->len += to_write; | |
912 | skb->truesize += to_write; | |
913 | atomic_add(to_write, &po->sk.sk_wmem_alloc); | |
914 | ||
915 | while (likely(to_write)) { | |
916 | nr_frags = skb_shinfo(skb)->nr_frags; | |
917 | ||
918 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { | |
40d4e3df ED |
919 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
920 | MAX_SKB_FRAGS); | |
69e3c75f JB |
921 | return -EFAULT; |
922 | } | |
923 | ||
924 | flush_dcache_page(page); | |
925 | get_page(page); | |
926 | skb_fill_page_desc(skb, | |
927 | nr_frags, | |
928 | page++, offset, len); | |
929 | to_write -= len; | |
930 | offset = 0; | |
931 | len_max = PAGE_SIZE; | |
932 | len = ((to_write > len_max) ? len_max : to_write); | |
933 | } | |
934 | ||
935 | return tp_len; | |
936 | } | |
937 | ||
938 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) | |
939 | { | |
940 | struct socket *sock; | |
941 | struct sk_buff *skb; | |
942 | struct net_device *dev; | |
943 | __be16 proto; | |
944 | int ifindex, err, reserve = 0; | |
40d4e3df ED |
945 | void *ph; |
946 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; | |
69e3c75f JB |
947 | int tp_len, size_max; |
948 | unsigned char *addr; | |
949 | int len_sum = 0; | |
950 | int status = 0; | |
951 | ||
952 | sock = po->sk.sk_socket; | |
953 | ||
954 | mutex_lock(&po->pg_vec_lock); | |
955 | ||
956 | err = -EBUSY; | |
957 | if (saddr == NULL) { | |
958 | ifindex = po->ifindex; | |
959 | proto = po->num; | |
960 | addr = NULL; | |
961 | } else { | |
962 | err = -EINVAL; | |
963 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
964 | goto out; | |
965 | if (msg->msg_namelen < (saddr->sll_halen | |
966 | + offsetof(struct sockaddr_ll, | |
967 | sll_addr))) | |
968 | goto out; | |
969 | ifindex = saddr->sll_ifindex; | |
970 | proto = saddr->sll_protocol; | |
971 | addr = saddr->sll_addr; | |
972 | } | |
973 | ||
974 | dev = dev_get_by_index(sock_net(&po->sk), ifindex); | |
975 | err = -ENXIO; | |
976 | if (unlikely(dev == NULL)) | |
977 | goto out; | |
978 | ||
979 | reserve = dev->hard_header_len; | |
980 | ||
981 | err = -ENETDOWN; | |
982 | if (unlikely(!(dev->flags & IFF_UP))) | |
983 | goto out_put; | |
984 | ||
985 | size_max = po->tx_ring.frame_size | |
986 | - sizeof(struct skb_shared_info) | |
987 | - po->tp_hdrlen | |
988 | - LL_ALLOCATED_SPACE(dev) | |
989 | - sizeof(struct sockaddr_ll); | |
990 | ||
991 | if (size_max > dev->mtu + reserve) | |
992 | size_max = dev->mtu + reserve; | |
993 | ||
994 | do { | |
995 | ph = packet_current_frame(po, &po->tx_ring, | |
996 | TP_STATUS_SEND_REQUEST); | |
997 | ||
998 | if (unlikely(ph == NULL)) { | |
999 | schedule(); | |
1000 | continue; | |
1001 | } | |
1002 | ||
1003 | status = TP_STATUS_SEND_REQUEST; | |
1004 | skb = sock_alloc_send_skb(&po->sk, | |
1005 | LL_ALLOCATED_SPACE(dev) | |
1006 | + sizeof(struct sockaddr_ll), | |
1007 | 0, &err); | |
1008 | ||
1009 | if (unlikely(skb == NULL)) | |
1010 | goto out_status; | |
1011 | ||
1012 | tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto, | |
1013 | addr); | |
1014 | ||
1015 | if (unlikely(tp_len < 0)) { | |
1016 | if (po->tp_loss) { | |
1017 | __packet_set_status(po, ph, | |
1018 | TP_STATUS_AVAILABLE); | |
1019 | packet_increment_head(&po->tx_ring); | |
1020 | kfree_skb(skb); | |
1021 | continue; | |
1022 | } else { | |
1023 | status = TP_STATUS_WRONG_FORMAT; | |
1024 | err = tp_len; | |
1025 | goto out_status; | |
1026 | } | |
1027 | } | |
1028 | ||
1029 | skb->destructor = tpacket_destruct_skb; | |
1030 | __packet_set_status(po, ph, TP_STATUS_SENDING); | |
1031 | atomic_inc(&po->tx_ring.pending); | |
1032 | ||
1033 | status = TP_STATUS_SEND_REQUEST; | |
1034 | err = dev_queue_xmit(skb); | |
1035 | if (unlikely(err > 0 && (err = net_xmit_errno(err)) != 0)) | |
1036 | goto out_xmit; | |
1037 | packet_increment_head(&po->tx_ring); | |
1038 | len_sum += tp_len; | |
40d4e3df | 1039 | } while (likely((ph != NULL) || ((!(msg->msg_flags & MSG_DONTWAIT)) |
69e3c75f JB |
1040 | && (atomic_read(&po->tx_ring.pending)))) |
1041 | ); | |
1042 | ||
1043 | err = len_sum; | |
1044 | goto out_put; | |
1045 | ||
1046 | out_xmit: | |
1047 | skb->destructor = sock_wfree; | |
1048 | atomic_dec(&po->tx_ring.pending); | |
1049 | out_status: | |
1050 | __packet_set_status(po, ph, status); | |
1051 | kfree_skb(skb); | |
1052 | out_put: | |
1053 | dev_put(dev); | |
1054 | out: | |
1055 | mutex_unlock(&po->pg_vec_lock); | |
1056 | return err; | |
1057 | } | |
1058 | #endif | |
1059 | ||
1060 | static int packet_snd(struct socket *sock, | |
1da177e4 LT |
1061 | struct msghdr *msg, size_t len) |
1062 | { | |
1063 | struct sock *sk = sock->sk; | |
40d4e3df | 1064 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
1da177e4 LT |
1065 | struct sk_buff *skb; |
1066 | struct net_device *dev; | |
0e11c91e | 1067 | __be16 proto; |
1da177e4 LT |
1068 | unsigned char *addr; |
1069 | int ifindex, err, reserve = 0; | |
1070 | ||
1071 | /* | |
1ce4f28b | 1072 | * Get and verify the address. |
1da177e4 | 1073 | */ |
1ce4f28b | 1074 | |
1da177e4 LT |
1075 | if (saddr == NULL) { |
1076 | struct packet_sock *po = pkt_sk(sk); | |
1077 | ||
1078 | ifindex = po->ifindex; | |
1079 | proto = po->num; | |
1080 | addr = NULL; | |
1081 | } else { | |
1082 | err = -EINVAL; | |
1083 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
1084 | goto out; | |
0fb375fb EB |
1085 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
1086 | goto out; | |
1da177e4 LT |
1087 | ifindex = saddr->sll_ifindex; |
1088 | proto = saddr->sll_protocol; | |
1089 | addr = saddr->sll_addr; | |
1090 | } | |
1091 | ||
1092 | ||
3b1e0a65 | 1093 | dev = dev_get_by_index(sock_net(sk), ifindex); |
1da177e4 LT |
1094 | err = -ENXIO; |
1095 | if (dev == NULL) | |
1096 | goto out_unlock; | |
1097 | if (sock->type == SOCK_RAW) | |
1098 | reserve = dev->hard_header_len; | |
1099 | ||
d5e76b0a DM |
1100 | err = -ENETDOWN; |
1101 | if (!(dev->flags & IFF_UP)) | |
1102 | goto out_unlock; | |
1103 | ||
1da177e4 LT |
1104 | err = -EMSGSIZE; |
1105 | if (len > dev->mtu+reserve) | |
1106 | goto out_unlock; | |
1107 | ||
f5184d26 | 1108 | skb = sock_alloc_send_skb(sk, len + LL_ALLOCATED_SPACE(dev), |
1da177e4 | 1109 | msg->msg_flags & MSG_DONTWAIT, &err); |
40d4e3df | 1110 | if (skb == NULL) |
1da177e4 LT |
1111 | goto out_unlock; |
1112 | ||
1113 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
c1d2bbe1 | 1114 | skb_reset_network_header(skb); |
1da177e4 | 1115 | |
0c4e8581 SH |
1116 | err = -EINVAL; |
1117 | if (sock->type == SOCK_DGRAM && | |
1118 | dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len) < 0) | |
1119 | goto out_free; | |
1da177e4 LT |
1120 | |
1121 | /* Returns -EFAULT on error */ | |
40d4e3df | 1122 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
1da177e4 LT |
1123 | if (err) |
1124 | goto out_free; | |
1125 | ||
1126 | skb->protocol = proto; | |
1127 | skb->dev = dev; | |
1128 | skb->priority = sk->sk_priority; | |
2d37a186 | 1129 | skb->mark = sk->sk_mark; |
1da177e4 | 1130 | |
1da177e4 LT |
1131 | /* |
1132 | * Now send it | |
1133 | */ | |
1134 | ||
1135 | err = dev_queue_xmit(skb); | |
1136 | if (err > 0 && (err = net_xmit_errno(err)) != 0) | |
1137 | goto out_unlock; | |
1138 | ||
1139 | dev_put(dev); | |
1140 | ||
40d4e3df | 1141 | return len; |
1da177e4 LT |
1142 | |
1143 | out_free: | |
1144 | kfree_skb(skb); | |
1145 | out_unlock: | |
1146 | if (dev) | |
1147 | dev_put(dev); | |
1148 | out: | |
1149 | return err; | |
1150 | } | |
1151 | ||
69e3c75f JB |
1152 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
1153 | struct msghdr *msg, size_t len) | |
1154 | { | |
1155 | #ifdef CONFIG_PACKET_MMAP | |
1156 | struct sock *sk = sock->sk; | |
1157 | struct packet_sock *po = pkt_sk(sk); | |
1158 | if (po->tx_ring.pg_vec) | |
1159 | return tpacket_snd(po, msg); | |
1160 | else | |
1161 | #endif | |
1162 | return packet_snd(sock, msg, len); | |
1163 | } | |
1164 | ||
1da177e4 LT |
1165 | /* |
1166 | * Close a PACKET socket. This is fairly simple. We immediately go | |
1167 | * to 'closed' state and remove our protocol entry in the device list. | |
1168 | */ | |
1169 | ||
1170 | static int packet_release(struct socket *sock) | |
1171 | { | |
1172 | struct sock *sk = sock->sk; | |
1173 | struct packet_sock *po; | |
d12d01d6 | 1174 | struct net *net; |
69e3c75f JB |
1175 | #ifdef CONFIG_PACKET_MMAP |
1176 | struct tpacket_req req; | |
1177 | #endif | |
1da177e4 LT |
1178 | |
1179 | if (!sk) | |
1180 | return 0; | |
1181 | ||
3b1e0a65 | 1182 | net = sock_net(sk); |
1da177e4 LT |
1183 | po = pkt_sk(sk); |
1184 | ||
2aaef4e4 | 1185 | write_lock_bh(&net->packet.sklist_lock); |
1da177e4 | 1186 | sk_del_node_init(sk); |
920de804 | 1187 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
2aaef4e4 | 1188 | write_unlock_bh(&net->packet.sklist_lock); |
1da177e4 LT |
1189 | |
1190 | /* | |
1191 | * Unhook packet receive handler. | |
1192 | */ | |
1193 | ||
1194 | if (po->running) { | |
1195 | /* | |
1196 | * Remove the protocol hook | |
1197 | */ | |
1198 | dev_remove_pack(&po->prot_hook); | |
1199 | po->running = 0; | |
1200 | po->num = 0; | |
1201 | __sock_put(sk); | |
1202 | } | |
1203 | ||
1da177e4 | 1204 | packet_flush_mclist(sk); |
1da177e4 LT |
1205 | |
1206 | #ifdef CONFIG_PACKET_MMAP | |
69e3c75f JB |
1207 | memset(&req, 0, sizeof(req)); |
1208 | ||
1209 | if (po->rx_ring.pg_vec) | |
1210 | packet_set_ring(sk, &req, 1, 0); | |
1211 | ||
1212 | if (po->tx_ring.pg_vec) | |
1213 | packet_set_ring(sk, &req, 1, 1); | |
1da177e4 LT |
1214 | #endif |
1215 | ||
1216 | /* | |
1217 | * Now the socket is dead. No more input will appear. | |
1218 | */ | |
1219 | ||
1220 | sock_orphan(sk); | |
1221 | sock->sk = NULL; | |
1222 | ||
1223 | /* Purge queues */ | |
1224 | ||
1225 | skb_queue_purge(&sk->sk_receive_queue); | |
17ab56a2 | 1226 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
1227 | |
1228 | sock_put(sk); | |
1229 | return 0; | |
1230 | } | |
1231 | ||
1232 | /* | |
1233 | * Attach a packet hook. | |
1234 | */ | |
1235 | ||
0e11c91e | 1236 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
1da177e4 LT |
1237 | { |
1238 | struct packet_sock *po = pkt_sk(sk); | |
1239 | /* | |
1240 | * Detach an existing hook if present. | |
1241 | */ | |
1242 | ||
1243 | lock_sock(sk); | |
1244 | ||
1245 | spin_lock(&po->bind_lock); | |
1246 | if (po->running) { | |
1247 | __sock_put(sk); | |
1248 | po->running = 0; | |
1249 | po->num = 0; | |
1250 | spin_unlock(&po->bind_lock); | |
1251 | dev_remove_pack(&po->prot_hook); | |
1252 | spin_lock(&po->bind_lock); | |
1253 | } | |
1254 | ||
1255 | po->num = protocol; | |
1256 | po->prot_hook.type = protocol; | |
1257 | po->prot_hook.dev = dev; | |
1258 | ||
1259 | po->ifindex = dev ? dev->ifindex : 0; | |
1260 | ||
1261 | if (protocol == 0) | |
1262 | goto out_unlock; | |
1263 | ||
be85d4ad | 1264 | if (!dev || (dev->flags & IFF_UP)) { |
1da177e4 LT |
1265 | dev_add_pack(&po->prot_hook); |
1266 | sock_hold(sk); | |
1267 | po->running = 1; | |
be85d4ad UT |
1268 | } else { |
1269 | sk->sk_err = ENETDOWN; | |
1270 | if (!sock_flag(sk, SOCK_DEAD)) | |
1271 | sk->sk_error_report(sk); | |
1da177e4 LT |
1272 | } |
1273 | ||
1274 | out_unlock: | |
1275 | spin_unlock(&po->bind_lock); | |
1276 | release_sock(sk); | |
1277 | return 0; | |
1278 | } | |
1279 | ||
1280 | /* | |
1281 | * Bind a packet socket to a device | |
1282 | */ | |
1283 | ||
40d4e3df ED |
1284 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
1285 | int addr_len) | |
1da177e4 | 1286 | { |
40d4e3df | 1287 | struct sock *sk = sock->sk; |
1da177e4 LT |
1288 | char name[15]; |
1289 | struct net_device *dev; | |
1290 | int err = -ENODEV; | |
1ce4f28b | 1291 | |
1da177e4 LT |
1292 | /* |
1293 | * Check legality | |
1294 | */ | |
1ce4f28b | 1295 | |
8ae55f04 | 1296 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 | 1297 | return -EINVAL; |
40d4e3df | 1298 | strlcpy(name, uaddr->sa_data, sizeof(name)); |
1da177e4 | 1299 | |
3b1e0a65 | 1300 | dev = dev_get_by_name(sock_net(sk), name); |
1da177e4 LT |
1301 | if (dev) { |
1302 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); | |
1303 | dev_put(dev); | |
1304 | } | |
1305 | return err; | |
1306 | } | |
1da177e4 LT |
1307 | |
1308 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
1309 | { | |
40d4e3df ED |
1310 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
1311 | struct sock *sk = sock->sk; | |
1da177e4 LT |
1312 | struct net_device *dev = NULL; |
1313 | int err; | |
1314 | ||
1315 | ||
1316 | /* | |
1317 | * Check legality | |
1318 | */ | |
1ce4f28b | 1319 | |
1da177e4 LT |
1320 | if (addr_len < sizeof(struct sockaddr_ll)) |
1321 | return -EINVAL; | |
1322 | if (sll->sll_family != AF_PACKET) | |
1323 | return -EINVAL; | |
1324 | ||
1325 | if (sll->sll_ifindex) { | |
1326 | err = -ENODEV; | |
3b1e0a65 | 1327 | dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex); |
1da177e4 LT |
1328 | if (dev == NULL) |
1329 | goto out; | |
1330 | } | |
1331 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
1332 | if (dev) | |
1333 | dev_put(dev); | |
1334 | ||
1335 | out: | |
1336 | return err; | |
1337 | } | |
1338 | ||
1339 | static struct proto packet_proto = { | |
1340 | .name = "PACKET", | |
1341 | .owner = THIS_MODULE, | |
1342 | .obj_size = sizeof(struct packet_sock), | |
1343 | }; | |
1344 | ||
1345 | /* | |
1ce4f28b | 1346 | * Create a packet of type SOCK_PACKET. |
1da177e4 LT |
1347 | */ |
1348 | ||
1b8d7ae4 | 1349 | static int packet_create(struct net *net, struct socket *sock, int protocol) |
1da177e4 LT |
1350 | { |
1351 | struct sock *sk; | |
1352 | struct packet_sock *po; | |
0e11c91e | 1353 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1da177e4 LT |
1354 | int err; |
1355 | ||
1356 | if (!capable(CAP_NET_RAW)) | |
1357 | return -EPERM; | |
be02097c DM |
1358 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
1359 | sock->type != SOCK_PACKET) | |
1da177e4 LT |
1360 | return -ESOCKTNOSUPPORT; |
1361 | ||
1362 | sock->state = SS_UNCONNECTED; | |
1363 | ||
1364 | err = -ENOBUFS; | |
6257ff21 | 1365 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto); |
1da177e4 LT |
1366 | if (sk == NULL) |
1367 | goto out; | |
1368 | ||
1369 | sock->ops = &packet_ops; | |
1da177e4 LT |
1370 | if (sock->type == SOCK_PACKET) |
1371 | sock->ops = &packet_ops_spkt; | |
be02097c | 1372 | |
1da177e4 LT |
1373 | sock_init_data(sock, sk); |
1374 | ||
1375 | po = pkt_sk(sk); | |
1376 | sk->sk_family = PF_PACKET; | |
0e11c91e | 1377 | po->num = proto; |
1da177e4 LT |
1378 | |
1379 | sk->sk_destruct = packet_sock_destruct; | |
17ab56a2 | 1380 | sk_refcnt_debug_inc(sk); |
1da177e4 LT |
1381 | |
1382 | /* | |
1383 | * Attach a protocol block | |
1384 | */ | |
1385 | ||
1386 | spin_lock_init(&po->bind_lock); | |
905db440 | 1387 | mutex_init(&po->pg_vec_lock); |
1da177e4 | 1388 | po->prot_hook.func = packet_rcv; |
be02097c | 1389 | |
1da177e4 LT |
1390 | if (sock->type == SOCK_PACKET) |
1391 | po->prot_hook.func = packet_rcv_spkt; | |
be02097c | 1392 | |
1da177e4 LT |
1393 | po->prot_hook.af_packet_priv = sk; |
1394 | ||
0e11c91e AV |
1395 | if (proto) { |
1396 | po->prot_hook.type = proto; | |
1da177e4 LT |
1397 | dev_add_pack(&po->prot_hook); |
1398 | sock_hold(sk); | |
1399 | po->running = 1; | |
1400 | } | |
1401 | ||
2aaef4e4 DL |
1402 | write_lock_bh(&net->packet.sklist_lock); |
1403 | sk_add_node(sk, &net->packet.sklist); | |
3680453c | 1404 | sock_prot_inuse_add(net, &packet_proto, 1); |
920de804 | 1405 | write_unlock_bh(&net->packet.sklist_lock); |
40d4e3df | 1406 | return 0; |
1da177e4 LT |
1407 | out: |
1408 | return err; | |
1409 | } | |
1410 | ||
1411 | /* | |
1412 | * Pull a packet from our receive queue and hand it to the user. | |
1413 | * If necessary we block. | |
1414 | */ | |
1415 | ||
1416 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1417 | struct msghdr *msg, size_t len, int flags) | |
1418 | { | |
1419 | struct sock *sk = sock->sk; | |
1420 | struct sk_buff *skb; | |
1421 | int copied, err; | |
0fb375fb | 1422 | struct sockaddr_ll *sll; |
1da177e4 LT |
1423 | |
1424 | err = -EINVAL; | |
1425 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) | |
1426 | goto out; | |
1427 | ||
1428 | #if 0 | |
1429 | /* What error should we return now? EUNATTACH? */ | |
1430 | if (pkt_sk(sk)->ifindex < 0) | |
1431 | return -ENODEV; | |
1432 | #endif | |
1433 | ||
1da177e4 LT |
1434 | /* |
1435 | * Call the generic datagram receiver. This handles all sorts | |
1436 | * of horrible races and re-entrancy so we can forget about it | |
1437 | * in the protocol layers. | |
1438 | * | |
1439 | * Now it will return ENETDOWN, if device have just gone down, | |
1440 | * but then it will block. | |
1441 | */ | |
1442 | ||
40d4e3df | 1443 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
1da177e4 LT |
1444 | |
1445 | /* | |
1ce4f28b | 1446 | * An error occurred so return it. Because skb_recv_datagram() |
1da177e4 LT |
1447 | * handles the blocking we don't see and worry about blocking |
1448 | * retries. | |
1449 | */ | |
1450 | ||
8ae55f04 | 1451 | if (skb == NULL) |
1da177e4 LT |
1452 | goto out; |
1453 | ||
0fb375fb EB |
1454 | /* |
1455 | * If the address length field is there to be filled in, we fill | |
1456 | * it in now. | |
1457 | */ | |
1458 | ||
ffbc6111 | 1459 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
0fb375fb EB |
1460 | if (sock->type == SOCK_PACKET) |
1461 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
1462 | else | |
1463 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); | |
1464 | ||
1da177e4 LT |
1465 | /* |
1466 | * You lose any data beyond the buffer you gave. If it worries a | |
1467 | * user program they can ask the device for its MTU anyway. | |
1468 | */ | |
1469 | ||
1470 | copied = skb->len; | |
40d4e3df ED |
1471 | if (copied > len) { |
1472 | copied = len; | |
1473 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 LT |
1474 | } |
1475 | ||
1476 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1477 | if (err) | |
1478 | goto out_free; | |
1479 | ||
3b885787 | 1480 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
1481 | |
1482 | if (msg->msg_name) | |
ffbc6111 HX |
1483 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
1484 | msg->msg_namelen); | |
1da177e4 | 1485 | |
8dc41944 | 1486 | if (pkt_sk(sk)->auxdata) { |
ffbc6111 HX |
1487 | struct tpacket_auxdata aux; |
1488 | ||
1489 | aux.tp_status = TP_STATUS_USER; | |
1490 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
1491 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; | |
1492 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; | |
1493 | aux.tp_snaplen = skb->len; | |
1494 | aux.tp_mac = 0; | |
bbe735e4 | 1495 | aux.tp_net = skb_network_offset(skb); |
393e52e3 | 1496 | aux.tp_vlan_tci = skb->vlan_tci; |
ffbc6111 HX |
1497 | |
1498 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); | |
8dc41944 HX |
1499 | } |
1500 | ||
1da177e4 LT |
1501 | /* |
1502 | * Free or return the buffer as appropriate. Again this | |
1503 | * hides all the races and re-entrancy issues from us. | |
1504 | */ | |
1505 | err = (flags&MSG_TRUNC) ? skb->len : copied; | |
1506 | ||
1507 | out_free: | |
1508 | skb_free_datagram(sk, skb); | |
1509 | out: | |
1510 | return err; | |
1511 | } | |
1512 | ||
1da177e4 LT |
1513 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
1514 | int *uaddr_len, int peer) | |
1515 | { | |
1516 | struct net_device *dev; | |
1517 | struct sock *sk = sock->sk; | |
1518 | ||
1519 | if (peer) | |
1520 | return -EOPNOTSUPP; | |
1521 | ||
1522 | uaddr->sa_family = AF_PACKET; | |
3b1e0a65 | 1523 | dev = dev_get_by_index(sock_net(sk), pkt_sk(sk)->ifindex); |
1da177e4 LT |
1524 | if (dev) { |
1525 | strlcpy(uaddr->sa_data, dev->name, 15); | |
1526 | dev_put(dev); | |
1527 | } else | |
1528 | memset(uaddr->sa_data, 0, 14); | |
1529 | *uaddr_len = sizeof(*uaddr); | |
1530 | ||
1531 | return 0; | |
1532 | } | |
1da177e4 LT |
1533 | |
1534 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
1535 | int *uaddr_len, int peer) | |
1536 | { | |
1537 | struct net_device *dev; | |
1538 | struct sock *sk = sock->sk; | |
1539 | struct packet_sock *po = pkt_sk(sk); | |
40d4e3df | 1540 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
1da177e4 LT |
1541 | |
1542 | if (peer) | |
1543 | return -EOPNOTSUPP; | |
1544 | ||
1545 | sll->sll_family = AF_PACKET; | |
1546 | sll->sll_ifindex = po->ifindex; | |
1547 | sll->sll_protocol = po->num; | |
3b1e0a65 | 1548 | dev = dev_get_by_index(sock_net(sk), po->ifindex); |
1da177e4 LT |
1549 | if (dev) { |
1550 | sll->sll_hatype = dev->type; | |
1551 | sll->sll_halen = dev->addr_len; | |
1552 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1553 | dev_put(dev); | |
1554 | } else { | |
1555 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
1556 | sll->sll_halen = 0; | |
1557 | } | |
0fb375fb | 1558 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
1559 | |
1560 | return 0; | |
1561 | } | |
1562 | ||
2aeb0b88 WC |
1563 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
1564 | int what) | |
1da177e4 LT |
1565 | { |
1566 | switch (i->type) { | |
1567 | case PACKET_MR_MULTICAST: | |
1568 | if (what > 0) | |
d95ed927 | 1569 | return dev_mc_add(dev, i->addr, i->alen, 0); |
1da177e4 | 1570 | else |
d95ed927 | 1571 | return dev_mc_delete(dev, i->addr, i->alen, 0); |
1da177e4 LT |
1572 | break; |
1573 | case PACKET_MR_PROMISC: | |
2aeb0b88 | 1574 | return dev_set_promiscuity(dev, what); |
1da177e4 LT |
1575 | break; |
1576 | case PACKET_MR_ALLMULTI: | |
2aeb0b88 | 1577 | return dev_set_allmulti(dev, what); |
1da177e4 | 1578 | break; |
d95ed927 EB |
1579 | case PACKET_MR_UNICAST: |
1580 | if (what > 0) | |
ccffad25 | 1581 | return dev_unicast_add(dev, i->addr); |
d95ed927 | 1582 | else |
ccffad25 | 1583 | return dev_unicast_delete(dev, i->addr); |
d95ed927 | 1584 | break; |
40d4e3df ED |
1585 | default: |
1586 | break; | |
1da177e4 | 1587 | } |
2aeb0b88 | 1588 | return 0; |
1da177e4 LT |
1589 | } |
1590 | ||
1591 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
1592 | { | |
40d4e3df | 1593 | for ( ; i; i = i->next) { |
1da177e4 LT |
1594 | if (i->ifindex == dev->ifindex) |
1595 | packet_dev_mc(dev, i, what); | |
1596 | } | |
1597 | } | |
1598 | ||
0fb375fb | 1599 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1600 | { |
1601 | struct packet_sock *po = pkt_sk(sk); | |
1602 | struct packet_mclist *ml, *i; | |
1603 | struct net_device *dev; | |
1604 | int err; | |
1605 | ||
1606 | rtnl_lock(); | |
1607 | ||
1608 | err = -ENODEV; | |
3b1e0a65 | 1609 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
1da177e4 LT |
1610 | if (!dev) |
1611 | goto done; | |
1612 | ||
1613 | err = -EINVAL; | |
1614 | if (mreq->mr_alen > dev->addr_len) | |
1615 | goto done; | |
1616 | ||
1617 | err = -ENOBUFS; | |
8b3a7005 | 1618 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
1619 | if (i == NULL) |
1620 | goto done; | |
1621 | ||
1622 | err = 0; | |
1623 | for (ml = po->mclist; ml; ml = ml->next) { | |
1624 | if (ml->ifindex == mreq->mr_ifindex && | |
1625 | ml->type == mreq->mr_type && | |
1626 | ml->alen == mreq->mr_alen && | |
1627 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1628 | ml->count++; | |
1629 | /* Free the new element ... */ | |
1630 | kfree(i); | |
1631 | goto done; | |
1632 | } | |
1633 | } | |
1634 | ||
1635 | i->type = mreq->mr_type; | |
1636 | i->ifindex = mreq->mr_ifindex; | |
1637 | i->alen = mreq->mr_alen; | |
1638 | memcpy(i->addr, mreq->mr_address, i->alen); | |
1639 | i->count = 1; | |
1640 | i->next = po->mclist; | |
1641 | po->mclist = i; | |
2aeb0b88 WC |
1642 | err = packet_dev_mc(dev, i, 1); |
1643 | if (err) { | |
1644 | po->mclist = i->next; | |
1645 | kfree(i); | |
1646 | } | |
1da177e4 LT |
1647 | |
1648 | done: | |
1649 | rtnl_unlock(); | |
1650 | return err; | |
1651 | } | |
1652 | ||
0fb375fb | 1653 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1654 | { |
1655 | struct packet_mclist *ml, **mlp; | |
1656 | ||
1657 | rtnl_lock(); | |
1658 | ||
1659 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
1660 | if (ml->ifindex == mreq->mr_ifindex && | |
1661 | ml->type == mreq->mr_type && | |
1662 | ml->alen == mreq->mr_alen && | |
1663 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1664 | if (--ml->count == 0) { | |
1665 | struct net_device *dev; | |
1666 | *mlp = ml->next; | |
ad959e76 ED |
1667 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1668 | if (dev) | |
1da177e4 | 1669 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
1670 | kfree(ml); |
1671 | } | |
1672 | rtnl_unlock(); | |
1673 | return 0; | |
1674 | } | |
1675 | } | |
1676 | rtnl_unlock(); | |
1677 | return -EADDRNOTAVAIL; | |
1678 | } | |
1679 | ||
1680 | static void packet_flush_mclist(struct sock *sk) | |
1681 | { | |
1682 | struct packet_sock *po = pkt_sk(sk); | |
1683 | struct packet_mclist *ml; | |
1684 | ||
1685 | if (!po->mclist) | |
1686 | return; | |
1687 | ||
1688 | rtnl_lock(); | |
1689 | while ((ml = po->mclist) != NULL) { | |
1690 | struct net_device *dev; | |
1691 | ||
1692 | po->mclist = ml->next; | |
ad959e76 ED |
1693 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1694 | if (dev != NULL) | |
1da177e4 | 1695 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
1696 | kfree(ml); |
1697 | } | |
1698 | rtnl_unlock(); | |
1699 | } | |
1da177e4 LT |
1700 | |
1701 | static int | |
b7058842 | 1702 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1703 | { |
1704 | struct sock *sk = sock->sk; | |
8dc41944 | 1705 | struct packet_sock *po = pkt_sk(sk); |
1da177e4 LT |
1706 | int ret; |
1707 | ||
1708 | if (level != SOL_PACKET) | |
1709 | return -ENOPROTOOPT; | |
1710 | ||
69e3c75f | 1711 | switch (optname) { |
1ce4f28b | 1712 | case PACKET_ADD_MEMBERSHIP: |
1da177e4 LT |
1713 | case PACKET_DROP_MEMBERSHIP: |
1714 | { | |
0fb375fb EB |
1715 | struct packet_mreq_max mreq; |
1716 | int len = optlen; | |
1717 | memset(&mreq, 0, sizeof(mreq)); | |
1718 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 1719 | return -EINVAL; |
0fb375fb EB |
1720 | if (len > sizeof(mreq)) |
1721 | len = sizeof(mreq); | |
40d4e3df | 1722 | if (copy_from_user(&mreq, optval, len)) |
1da177e4 | 1723 | return -EFAULT; |
0fb375fb EB |
1724 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
1725 | return -EINVAL; | |
1da177e4 LT |
1726 | if (optname == PACKET_ADD_MEMBERSHIP) |
1727 | ret = packet_mc_add(sk, &mreq); | |
1728 | else | |
1729 | ret = packet_mc_drop(sk, &mreq); | |
1730 | return ret; | |
1731 | } | |
a2efcfa0 | 1732 | |
1da177e4 LT |
1733 | #ifdef CONFIG_PACKET_MMAP |
1734 | case PACKET_RX_RING: | |
69e3c75f | 1735 | case PACKET_TX_RING: |
1da177e4 LT |
1736 | { |
1737 | struct tpacket_req req; | |
1738 | ||
40d4e3df | 1739 | if (optlen < sizeof(req)) |
1da177e4 | 1740 | return -EINVAL; |
40d4e3df | 1741 | if (copy_from_user(&req, optval, sizeof(req))) |
1da177e4 | 1742 | return -EFAULT; |
69e3c75f | 1743 | return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING); |
1da177e4 LT |
1744 | } |
1745 | case PACKET_COPY_THRESH: | |
1746 | { | |
1747 | int val; | |
1748 | ||
40d4e3df | 1749 | if (optlen != sizeof(val)) |
1da177e4 | 1750 | return -EINVAL; |
40d4e3df | 1751 | if (copy_from_user(&val, optval, sizeof(val))) |
1da177e4 LT |
1752 | return -EFAULT; |
1753 | ||
1754 | pkt_sk(sk)->copy_thresh = val; | |
1755 | return 0; | |
1756 | } | |
bbd6ef87 PM |
1757 | case PACKET_VERSION: |
1758 | { | |
1759 | int val; | |
1760 | ||
1761 | if (optlen != sizeof(val)) | |
1762 | return -EINVAL; | |
69e3c75f | 1763 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
bbd6ef87 PM |
1764 | return -EBUSY; |
1765 | if (copy_from_user(&val, optval, sizeof(val))) | |
1766 | return -EFAULT; | |
1767 | switch (val) { | |
1768 | case TPACKET_V1: | |
1769 | case TPACKET_V2: | |
1770 | po->tp_version = val; | |
1771 | return 0; | |
1772 | default: | |
1773 | return -EINVAL; | |
1774 | } | |
1775 | } | |
8913336a PM |
1776 | case PACKET_RESERVE: |
1777 | { | |
1778 | unsigned int val; | |
1779 | ||
1780 | if (optlen != sizeof(val)) | |
1781 | return -EINVAL; | |
69e3c75f | 1782 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
8913336a PM |
1783 | return -EBUSY; |
1784 | if (copy_from_user(&val, optval, sizeof(val))) | |
1785 | return -EFAULT; | |
1786 | po->tp_reserve = val; | |
1787 | return 0; | |
1788 | } | |
69e3c75f JB |
1789 | case PACKET_LOSS: |
1790 | { | |
1791 | unsigned int val; | |
1792 | ||
1793 | if (optlen != sizeof(val)) | |
1794 | return -EINVAL; | |
1795 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
1796 | return -EBUSY; | |
1797 | if (copy_from_user(&val, optval, sizeof(val))) | |
1798 | return -EFAULT; | |
1799 | po->tp_loss = !!val; | |
1800 | return 0; | |
1801 | } | |
1da177e4 | 1802 | #endif |
8dc41944 HX |
1803 | case PACKET_AUXDATA: |
1804 | { | |
1805 | int val; | |
1806 | ||
1807 | if (optlen < sizeof(val)) | |
1808 | return -EINVAL; | |
1809 | if (copy_from_user(&val, optval, sizeof(val))) | |
1810 | return -EFAULT; | |
1811 | ||
1812 | po->auxdata = !!val; | |
1813 | return 0; | |
1814 | } | |
80feaacb PWJ |
1815 | case PACKET_ORIGDEV: |
1816 | { | |
1817 | int val; | |
1818 | ||
1819 | if (optlen < sizeof(val)) | |
1820 | return -EINVAL; | |
1821 | if (copy_from_user(&val, optval, sizeof(val))) | |
1822 | return -EFAULT; | |
1823 | ||
1824 | po->origdev = !!val; | |
1825 | return 0; | |
1826 | } | |
1da177e4 LT |
1827 | default: |
1828 | return -ENOPROTOOPT; | |
1829 | } | |
1830 | } | |
1831 | ||
1832 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
1833 | char __user *optval, int __user *optlen) | |
1834 | { | |
1835 | int len; | |
8dc41944 | 1836 | int val; |
1da177e4 LT |
1837 | struct sock *sk = sock->sk; |
1838 | struct packet_sock *po = pkt_sk(sk); | |
8dc41944 HX |
1839 | void *data; |
1840 | struct tpacket_stats st; | |
1da177e4 LT |
1841 | |
1842 | if (level != SOL_PACKET) | |
1843 | return -ENOPROTOOPT; | |
1844 | ||
8ae55f04 KK |
1845 | if (get_user(len, optlen)) |
1846 | return -EFAULT; | |
1da177e4 LT |
1847 | |
1848 | if (len < 0) | |
1849 | return -EINVAL; | |
1ce4f28b | 1850 | |
69e3c75f | 1851 | switch (optname) { |
1da177e4 | 1852 | case PACKET_STATISTICS: |
1da177e4 LT |
1853 | if (len > sizeof(struct tpacket_stats)) |
1854 | len = sizeof(struct tpacket_stats); | |
1855 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1856 | st = po->stats; | |
1857 | memset(&po->stats, 0, sizeof(st)); | |
1858 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1859 | st.tp_packets += st.tp_drops; | |
1860 | ||
8dc41944 HX |
1861 | data = &st; |
1862 | break; | |
1863 | case PACKET_AUXDATA: | |
1864 | if (len > sizeof(int)) | |
1865 | len = sizeof(int); | |
1866 | val = po->auxdata; | |
1867 | ||
80feaacb PWJ |
1868 | data = &val; |
1869 | break; | |
1870 | case PACKET_ORIGDEV: | |
1871 | if (len > sizeof(int)) | |
1872 | len = sizeof(int); | |
1873 | val = po->origdev; | |
1874 | ||
8dc41944 | 1875 | data = &val; |
1da177e4 | 1876 | break; |
bbd6ef87 PM |
1877 | #ifdef CONFIG_PACKET_MMAP |
1878 | case PACKET_VERSION: | |
1879 | if (len > sizeof(int)) | |
1880 | len = sizeof(int); | |
1881 | val = po->tp_version; | |
1882 | data = &val; | |
1883 | break; | |
1884 | case PACKET_HDRLEN: | |
1885 | if (len > sizeof(int)) | |
1886 | len = sizeof(int); | |
1887 | if (copy_from_user(&val, optval, len)) | |
1888 | return -EFAULT; | |
1889 | switch (val) { | |
1890 | case TPACKET_V1: | |
1891 | val = sizeof(struct tpacket_hdr); | |
1892 | break; | |
1893 | case TPACKET_V2: | |
1894 | val = sizeof(struct tpacket2_hdr); | |
1895 | break; | |
1896 | default: | |
1897 | return -EINVAL; | |
1898 | } | |
1899 | data = &val; | |
1900 | break; | |
8913336a PM |
1901 | case PACKET_RESERVE: |
1902 | if (len > sizeof(unsigned int)) | |
1903 | len = sizeof(unsigned int); | |
1904 | val = po->tp_reserve; | |
1905 | data = &val; | |
1906 | break; | |
69e3c75f JB |
1907 | case PACKET_LOSS: |
1908 | if (len > sizeof(unsigned int)) | |
1909 | len = sizeof(unsigned int); | |
1910 | val = po->tp_loss; | |
1911 | data = &val; | |
1912 | break; | |
bbd6ef87 | 1913 | #endif |
1da177e4 LT |
1914 | default: |
1915 | return -ENOPROTOOPT; | |
1916 | } | |
1917 | ||
8ae55f04 KK |
1918 | if (put_user(len, optlen)) |
1919 | return -EFAULT; | |
8dc41944 HX |
1920 | if (copy_to_user(optval, data, len)) |
1921 | return -EFAULT; | |
8ae55f04 | 1922 | return 0; |
1da177e4 LT |
1923 | } |
1924 | ||
1925 | ||
1926 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) | |
1927 | { | |
1928 | struct sock *sk; | |
1929 | struct hlist_node *node; | |
ad930650 | 1930 | struct net_device *dev = data; |
c346dca1 | 1931 | struct net *net = dev_net(dev); |
1da177e4 | 1932 | |
2aaef4e4 DL |
1933 | read_lock(&net->packet.sklist_lock); |
1934 | sk_for_each(sk, node, &net->packet.sklist) { | |
1da177e4 LT |
1935 | struct packet_sock *po = pkt_sk(sk); |
1936 | ||
1937 | switch (msg) { | |
1938 | case NETDEV_UNREGISTER: | |
1da177e4 LT |
1939 | if (po->mclist) |
1940 | packet_dev_mclist(dev, po->mclist, -1); | |
a2efcfa0 DM |
1941 | /* fallthrough */ |
1942 | ||
1da177e4 LT |
1943 | case NETDEV_DOWN: |
1944 | if (dev->ifindex == po->ifindex) { | |
1945 | spin_lock(&po->bind_lock); | |
1946 | if (po->running) { | |
1947 | __dev_remove_pack(&po->prot_hook); | |
1948 | __sock_put(sk); | |
1949 | po->running = 0; | |
1950 | sk->sk_err = ENETDOWN; | |
1951 | if (!sock_flag(sk, SOCK_DEAD)) | |
1952 | sk->sk_error_report(sk); | |
1953 | } | |
1954 | if (msg == NETDEV_UNREGISTER) { | |
1955 | po->ifindex = -1; | |
1956 | po->prot_hook.dev = NULL; | |
1957 | } | |
1958 | spin_unlock(&po->bind_lock); | |
1959 | } | |
1960 | break; | |
1961 | case NETDEV_UP: | |
1962 | spin_lock(&po->bind_lock); | |
1963 | if (dev->ifindex == po->ifindex && po->num && | |
1964 | !po->running) { | |
1965 | dev_add_pack(&po->prot_hook); | |
1966 | sock_hold(sk); | |
1967 | po->running = 1; | |
1968 | } | |
1969 | spin_unlock(&po->bind_lock); | |
1970 | break; | |
1971 | } | |
1972 | } | |
2aaef4e4 | 1973 | read_unlock(&net->packet.sklist_lock); |
1da177e4 LT |
1974 | return NOTIFY_DONE; |
1975 | } | |
1976 | ||
1977 | ||
1978 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
1979 | unsigned long arg) | |
1980 | { | |
1981 | struct sock *sk = sock->sk; | |
1982 | ||
69e3c75f | 1983 | switch (cmd) { |
40d4e3df ED |
1984 | case SIOCOUTQ: |
1985 | { | |
1986 | int amount = sk_wmem_alloc_get(sk); | |
31e6d363 | 1987 | |
40d4e3df ED |
1988 | return put_user(amount, (int __user *)arg); |
1989 | } | |
1990 | case SIOCINQ: | |
1991 | { | |
1992 | struct sk_buff *skb; | |
1993 | int amount = 0; | |
1994 | ||
1995 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1996 | skb = skb_peek(&sk->sk_receive_queue); | |
1997 | if (skb) | |
1998 | amount = skb->len; | |
1999 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
2000 | return put_user(amount, (int __user *)arg); | |
2001 | } | |
2002 | case SIOCGSTAMP: | |
2003 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
2004 | case SIOCGSTAMPNS: | |
2005 | return sock_get_timestampns(sk, (struct timespec __user *)arg); | |
1ce4f28b | 2006 | |
1da177e4 | 2007 | #ifdef CONFIG_INET |
40d4e3df ED |
2008 | case SIOCADDRT: |
2009 | case SIOCDELRT: | |
2010 | case SIOCDARP: | |
2011 | case SIOCGARP: | |
2012 | case SIOCSARP: | |
2013 | case SIOCGIFADDR: | |
2014 | case SIOCSIFADDR: | |
2015 | case SIOCGIFBRDADDR: | |
2016 | case SIOCSIFBRDADDR: | |
2017 | case SIOCGIFNETMASK: | |
2018 | case SIOCSIFNETMASK: | |
2019 | case SIOCGIFDSTADDR: | |
2020 | case SIOCSIFDSTADDR: | |
2021 | case SIOCSIFFLAGS: | |
2022 | if (!net_eq(sock_net(sk), &init_net)) | |
2023 | return -ENOIOCTLCMD; | |
2024 | return inet_dgram_ops.ioctl(sock, cmd, arg); | |
1da177e4 LT |
2025 | #endif |
2026 | ||
40d4e3df ED |
2027 | default: |
2028 | return -ENOIOCTLCMD; | |
1da177e4 LT |
2029 | } |
2030 | return 0; | |
2031 | } | |
2032 | ||
2033 | #ifndef CONFIG_PACKET_MMAP | |
2034 | #define packet_mmap sock_no_mmap | |
2035 | #define packet_poll datagram_poll | |
2036 | #else | |
2037 | ||
40d4e3df | 2038 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
1da177e4 LT |
2039 | poll_table *wait) |
2040 | { | |
2041 | struct sock *sk = sock->sk; | |
2042 | struct packet_sock *po = pkt_sk(sk); | |
2043 | unsigned int mask = datagram_poll(file, sock, wait); | |
2044 | ||
2045 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2046 | if (po->rx_ring.pg_vec) { |
2047 | if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL)) | |
1da177e4 LT |
2048 | mask |= POLLIN | POLLRDNORM; |
2049 | } | |
2050 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2051 | spin_lock_bh(&sk->sk_write_queue.lock); |
2052 | if (po->tx_ring.pg_vec) { | |
2053 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) | |
2054 | mask |= POLLOUT | POLLWRNORM; | |
2055 | } | |
2056 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
1da177e4 LT |
2057 | return mask; |
2058 | } | |
2059 | ||
2060 | ||
2061 | /* Dirty? Well, I still did not learn better way to account | |
2062 | * for user mmaps. | |
2063 | */ | |
2064 | ||
2065 | static void packet_mm_open(struct vm_area_struct *vma) | |
2066 | { | |
2067 | struct file *file = vma->vm_file; | |
40d4e3df | 2068 | struct socket *sock = file->private_data; |
1da177e4 | 2069 | struct sock *sk = sock->sk; |
1ce4f28b | 2070 | |
1da177e4 LT |
2071 | if (sk) |
2072 | atomic_inc(&pkt_sk(sk)->mapped); | |
2073 | } | |
2074 | ||
2075 | static void packet_mm_close(struct vm_area_struct *vma) | |
2076 | { | |
2077 | struct file *file = vma->vm_file; | |
40d4e3df | 2078 | struct socket *sock = file->private_data; |
1da177e4 | 2079 | struct sock *sk = sock->sk; |
1ce4f28b | 2080 | |
1da177e4 LT |
2081 | if (sk) |
2082 | atomic_dec(&pkt_sk(sk)->mapped); | |
2083 | } | |
2084 | ||
f0f37e2f | 2085 | static const struct vm_operations_struct packet_mmap_ops = { |
40d4e3df ED |
2086 | .open = packet_mm_open, |
2087 | .close = packet_mm_close, | |
1da177e4 LT |
2088 | }; |
2089 | ||
4ebf0ae2 | 2090 | static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len) |
1da177e4 LT |
2091 | { |
2092 | int i; | |
2093 | ||
4ebf0ae2 DM |
2094 | for (i = 0; i < len; i++) { |
2095 | if (likely(pg_vec[i])) | |
2096 | free_pages((unsigned long) pg_vec[i], order); | |
1da177e4 LT |
2097 | } |
2098 | kfree(pg_vec); | |
2099 | } | |
2100 | ||
4ebf0ae2 DM |
2101 | static inline char *alloc_one_pg_vec_page(unsigned long order) |
2102 | { | |
719bfeaa ED |
2103 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN; |
2104 | ||
2105 | return (char *) __get_free_pages(gfp_flags, order); | |
4ebf0ae2 DM |
2106 | } |
2107 | ||
2108 | static char **alloc_pg_vec(struct tpacket_req *req, int order) | |
2109 | { | |
2110 | unsigned int block_nr = req->tp_block_nr; | |
2111 | char **pg_vec; | |
2112 | int i; | |
2113 | ||
2114 | pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL); | |
2115 | if (unlikely(!pg_vec)) | |
2116 | goto out; | |
2117 | ||
2118 | for (i = 0; i < block_nr; i++) { | |
2119 | pg_vec[i] = alloc_one_pg_vec_page(order); | |
2120 | if (unlikely(!pg_vec[i])) | |
2121 | goto out_free_pgvec; | |
2122 | } | |
2123 | ||
2124 | out: | |
2125 | return pg_vec; | |
2126 | ||
2127 | out_free_pgvec: | |
2128 | free_pg_vec(pg_vec, order, block_nr); | |
2129 | pg_vec = NULL; | |
2130 | goto out; | |
2131 | } | |
1da177e4 | 2132 | |
69e3c75f JB |
2133 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
2134 | int closing, int tx_ring) | |
1da177e4 LT |
2135 | { |
2136 | char **pg_vec = NULL; | |
2137 | struct packet_sock *po = pkt_sk(sk); | |
0e11c91e | 2138 | int was_running, order = 0; |
69e3c75f JB |
2139 | struct packet_ring_buffer *rb; |
2140 | struct sk_buff_head *rb_queue; | |
0e11c91e | 2141 | __be16 num; |
69e3c75f | 2142 | int err; |
1ce4f28b | 2143 | |
69e3c75f JB |
2144 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
2145 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; | |
1da177e4 | 2146 | |
69e3c75f JB |
2147 | err = -EBUSY; |
2148 | if (!closing) { | |
2149 | if (atomic_read(&po->mapped)) | |
2150 | goto out; | |
2151 | if (atomic_read(&rb->pending)) | |
2152 | goto out; | |
2153 | } | |
1da177e4 | 2154 | |
69e3c75f JB |
2155 | if (req->tp_block_nr) { |
2156 | /* Sanity tests and some calculations */ | |
2157 | err = -EBUSY; | |
2158 | if (unlikely(rb->pg_vec)) | |
2159 | goto out; | |
1da177e4 | 2160 | |
bbd6ef87 PM |
2161 | switch (po->tp_version) { |
2162 | case TPACKET_V1: | |
2163 | po->tp_hdrlen = TPACKET_HDRLEN; | |
2164 | break; | |
2165 | case TPACKET_V2: | |
2166 | po->tp_hdrlen = TPACKET2_HDRLEN; | |
2167 | break; | |
2168 | } | |
2169 | ||
69e3c75f | 2170 | err = -EINVAL; |
4ebf0ae2 | 2171 | if (unlikely((int)req->tp_block_size <= 0)) |
69e3c75f | 2172 | goto out; |
4ebf0ae2 | 2173 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
69e3c75f | 2174 | goto out; |
8913336a | 2175 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
69e3c75f JB |
2176 | po->tp_reserve)) |
2177 | goto out; | |
4ebf0ae2 | 2178 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
69e3c75f | 2179 | goto out; |
1da177e4 | 2180 | |
69e3c75f JB |
2181 | rb->frames_per_block = req->tp_block_size/req->tp_frame_size; |
2182 | if (unlikely(rb->frames_per_block <= 0)) | |
2183 | goto out; | |
2184 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != | |
2185 | req->tp_frame_nr)) | |
2186 | goto out; | |
1da177e4 LT |
2187 | |
2188 | err = -ENOMEM; | |
4ebf0ae2 DM |
2189 | order = get_order(req->tp_block_size); |
2190 | pg_vec = alloc_pg_vec(req, order); | |
2191 | if (unlikely(!pg_vec)) | |
1da177e4 | 2192 | goto out; |
69e3c75f JB |
2193 | } |
2194 | /* Done */ | |
2195 | else { | |
2196 | err = -EINVAL; | |
4ebf0ae2 | 2197 | if (unlikely(req->tp_frame_nr)) |
69e3c75f | 2198 | goto out; |
1da177e4 LT |
2199 | } |
2200 | ||
2201 | lock_sock(sk); | |
2202 | ||
2203 | /* Detach socket from network */ | |
2204 | spin_lock(&po->bind_lock); | |
2205 | was_running = po->running; | |
2206 | num = po->num; | |
2207 | if (was_running) { | |
2208 | __dev_remove_pack(&po->prot_hook); | |
2209 | po->num = 0; | |
2210 | po->running = 0; | |
2211 | __sock_put(sk); | |
2212 | } | |
2213 | spin_unlock(&po->bind_lock); | |
1ce4f28b | 2214 | |
1da177e4 LT |
2215 | synchronize_net(); |
2216 | ||
2217 | err = -EBUSY; | |
905db440 | 2218 | mutex_lock(&po->pg_vec_lock); |
1da177e4 LT |
2219 | if (closing || atomic_read(&po->mapped) == 0) { |
2220 | err = 0; | |
2221 | #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) | |
69e3c75f JB |
2222 | spin_lock_bh(&rb_queue->lock); |
2223 | pg_vec = XC(rb->pg_vec, pg_vec); | |
2224 | rb->frame_max = (req->tp_frame_nr - 1); | |
2225 | rb->head = 0; | |
2226 | rb->frame_size = req->tp_frame_size; | |
2227 | spin_unlock_bh(&rb_queue->lock); | |
2228 | ||
2229 | order = XC(rb->pg_vec_order, order); | |
2230 | req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr); | |
2231 | ||
2232 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
2233 | po->prot_hook.func = (po->rx_ring.pg_vec) ? | |
2234 | tpacket_rcv : packet_rcv; | |
2235 | skb_queue_purge(rb_queue); | |
1da177e4 LT |
2236 | #undef XC |
2237 | if (atomic_read(&po->mapped)) | |
40d4e3df ED |
2238 | pr_err("packet_mmap: vma is busy: %d\n", |
2239 | atomic_read(&po->mapped)); | |
1da177e4 | 2240 | } |
905db440 | 2241 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2242 | |
2243 | spin_lock(&po->bind_lock); | |
2244 | if (was_running && !po->running) { | |
2245 | sock_hold(sk); | |
2246 | po->running = 1; | |
2247 | po->num = num; | |
2248 | dev_add_pack(&po->prot_hook); | |
2249 | } | |
2250 | spin_unlock(&po->bind_lock); | |
2251 | ||
2252 | release_sock(sk); | |
2253 | ||
1da177e4 LT |
2254 | if (pg_vec) |
2255 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
2256 | out: | |
2257 | return err; | |
2258 | } | |
2259 | ||
69e3c75f JB |
2260 | static int packet_mmap(struct file *file, struct socket *sock, |
2261 | struct vm_area_struct *vma) | |
1da177e4 LT |
2262 | { |
2263 | struct sock *sk = sock->sk; | |
2264 | struct packet_sock *po = pkt_sk(sk); | |
69e3c75f JB |
2265 | unsigned long size, expected_size; |
2266 | struct packet_ring_buffer *rb; | |
1da177e4 LT |
2267 | unsigned long start; |
2268 | int err = -EINVAL; | |
2269 | int i; | |
2270 | ||
2271 | if (vma->vm_pgoff) | |
2272 | return -EINVAL; | |
2273 | ||
905db440 | 2274 | mutex_lock(&po->pg_vec_lock); |
69e3c75f JB |
2275 | |
2276 | expected_size = 0; | |
2277 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { | |
2278 | if (rb->pg_vec) { | |
2279 | expected_size += rb->pg_vec_len | |
2280 | * rb->pg_vec_pages | |
2281 | * PAGE_SIZE; | |
2282 | } | |
2283 | } | |
2284 | ||
2285 | if (expected_size == 0) | |
1da177e4 | 2286 | goto out; |
69e3c75f JB |
2287 | |
2288 | size = vma->vm_end - vma->vm_start; | |
2289 | if (size != expected_size) | |
1da177e4 LT |
2290 | goto out; |
2291 | ||
1da177e4 | 2292 | start = vma->vm_start; |
69e3c75f JB |
2293 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
2294 | if (rb->pg_vec == NULL) | |
2295 | continue; | |
2296 | ||
2297 | for (i = 0; i < rb->pg_vec_len; i++) { | |
2298 | struct page *page = virt_to_page(rb->pg_vec[i]); | |
2299 | int pg_num; | |
2300 | ||
2301 | for (pg_num = 0; pg_num < rb->pg_vec_pages; | |
40d4e3df | 2302 | pg_num++, page++) { |
69e3c75f JB |
2303 | err = vm_insert_page(vma, start, page); |
2304 | if (unlikely(err)) | |
2305 | goto out; | |
2306 | start += PAGE_SIZE; | |
2307 | } | |
4ebf0ae2 | 2308 | } |
1da177e4 | 2309 | } |
69e3c75f | 2310 | |
4ebf0ae2 | 2311 | atomic_inc(&po->mapped); |
1da177e4 LT |
2312 | vma->vm_ops = &packet_mmap_ops; |
2313 | err = 0; | |
2314 | ||
2315 | out: | |
905db440 | 2316 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2317 | return err; |
2318 | } | |
2319 | #endif | |
2320 | ||
2321 | ||
90ddc4f0 | 2322 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
2323 | .family = PF_PACKET, |
2324 | .owner = THIS_MODULE, | |
2325 | .release = packet_release, | |
2326 | .bind = packet_bind_spkt, | |
2327 | .connect = sock_no_connect, | |
2328 | .socketpair = sock_no_socketpair, | |
2329 | .accept = sock_no_accept, | |
2330 | .getname = packet_getname_spkt, | |
2331 | .poll = datagram_poll, | |
2332 | .ioctl = packet_ioctl, | |
2333 | .listen = sock_no_listen, | |
2334 | .shutdown = sock_no_shutdown, | |
2335 | .setsockopt = sock_no_setsockopt, | |
2336 | .getsockopt = sock_no_getsockopt, | |
2337 | .sendmsg = packet_sendmsg_spkt, | |
2338 | .recvmsg = packet_recvmsg, | |
2339 | .mmap = sock_no_mmap, | |
2340 | .sendpage = sock_no_sendpage, | |
2341 | }; | |
1da177e4 | 2342 | |
90ddc4f0 | 2343 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
2344 | .family = PF_PACKET, |
2345 | .owner = THIS_MODULE, | |
2346 | .release = packet_release, | |
2347 | .bind = packet_bind, | |
2348 | .connect = sock_no_connect, | |
2349 | .socketpair = sock_no_socketpair, | |
2350 | .accept = sock_no_accept, | |
1ce4f28b | 2351 | .getname = packet_getname, |
1da177e4 LT |
2352 | .poll = packet_poll, |
2353 | .ioctl = packet_ioctl, | |
2354 | .listen = sock_no_listen, | |
2355 | .shutdown = sock_no_shutdown, | |
2356 | .setsockopt = packet_setsockopt, | |
2357 | .getsockopt = packet_getsockopt, | |
2358 | .sendmsg = packet_sendmsg, | |
2359 | .recvmsg = packet_recvmsg, | |
2360 | .mmap = packet_mmap, | |
2361 | .sendpage = sock_no_sendpage, | |
2362 | }; | |
2363 | ||
ec1b4cf7 | 2364 | static const struct net_proto_family packet_family_ops = { |
1da177e4 LT |
2365 | .family = PF_PACKET, |
2366 | .create = packet_create, | |
2367 | .owner = THIS_MODULE, | |
2368 | }; | |
2369 | ||
2370 | static struct notifier_block packet_netdev_notifier = { | |
40d4e3df | 2371 | .notifier_call = packet_notifier, |
1da177e4 LT |
2372 | }; |
2373 | ||
2374 | #ifdef CONFIG_PROC_FS | |
d12d01d6 | 2375 | static inline struct sock *packet_seq_idx(struct net *net, loff_t off) |
1da177e4 LT |
2376 | { |
2377 | struct sock *s; | |
2378 | struct hlist_node *node; | |
2379 | ||
2aaef4e4 | 2380 | sk_for_each(s, node, &net->packet.sklist) { |
1da177e4 LT |
2381 | if (!off--) |
2382 | return s; | |
2383 | } | |
2384 | return NULL; | |
2385 | } | |
2386 | ||
2387 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
40ccbf52 | 2388 | __acquires(seq_file_net(seq)->packet.sklist_lock) |
1da177e4 | 2389 | { |
e372c414 | 2390 | struct net *net = seq_file_net(seq); |
2aaef4e4 | 2391 | read_lock(&net->packet.sklist_lock); |
d12d01d6 | 2392 | return *pos ? packet_seq_idx(net, *pos - 1) : SEQ_START_TOKEN; |
1da177e4 LT |
2393 | } |
2394 | ||
2395 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2396 | { | |
1bf40954 | 2397 | struct net *net = seq_file_net(seq); |
1da177e4 | 2398 | ++*pos; |
1ce4f28b | 2399 | return (v == SEQ_START_TOKEN) |
2aaef4e4 | 2400 | ? sk_head(&net->packet.sklist) |
40d4e3df | 2401 | : sk_next((struct sock *)v) ; |
1da177e4 LT |
2402 | } |
2403 | ||
2404 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
40ccbf52 | 2405 | __releases(seq_file_net(seq)->packet.sklist_lock) |
1da177e4 | 2406 | { |
1bf40954 | 2407 | struct net *net = seq_file_net(seq); |
2aaef4e4 | 2408 | read_unlock(&net->packet.sklist_lock); |
1da177e4 LT |
2409 | } |
2410 | ||
1ce4f28b | 2411 | static int packet_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
2412 | { |
2413 | if (v == SEQ_START_TOKEN) | |
2414 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
2415 | else { | |
2416 | struct sock *s = v; | |
2417 | const struct packet_sock *po = pkt_sk(s); | |
2418 | ||
2419 | seq_printf(seq, | |
2420 | "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", | |
2421 | s, | |
2422 | atomic_read(&s->sk_refcnt), | |
2423 | s->sk_type, | |
2424 | ntohs(po->num), | |
2425 | po->ifindex, | |
2426 | po->running, | |
2427 | atomic_read(&s->sk_rmem_alloc), | |
2428 | sock_i_uid(s), | |
40d4e3df | 2429 | sock_i_ino(s)); |
1da177e4 LT |
2430 | } |
2431 | ||
2432 | return 0; | |
2433 | } | |
2434 | ||
56b3d975 | 2435 | static const struct seq_operations packet_seq_ops = { |
1da177e4 LT |
2436 | .start = packet_seq_start, |
2437 | .next = packet_seq_next, | |
2438 | .stop = packet_seq_stop, | |
2439 | .show = packet_seq_show, | |
2440 | }; | |
2441 | ||
2442 | static int packet_seq_open(struct inode *inode, struct file *file) | |
2443 | { | |
e372c414 DL |
2444 | return seq_open_net(inode, file, &packet_seq_ops, |
2445 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2446 | } |
2447 | ||
da7071d7 | 2448 | static const struct file_operations packet_seq_fops = { |
1da177e4 LT |
2449 | .owner = THIS_MODULE, |
2450 | .open = packet_seq_open, | |
2451 | .read = seq_read, | |
2452 | .llseek = seq_lseek, | |
e372c414 | 2453 | .release = seq_release_net, |
1da177e4 LT |
2454 | }; |
2455 | ||
2456 | #endif | |
2457 | ||
d12d01d6 DL |
2458 | static int packet_net_init(struct net *net) |
2459 | { | |
2aaef4e4 DL |
2460 | rwlock_init(&net->packet.sklist_lock); |
2461 | INIT_HLIST_HEAD(&net->packet.sklist); | |
d12d01d6 DL |
2462 | |
2463 | if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops)) | |
2464 | return -ENOMEM; | |
2465 | ||
2466 | return 0; | |
2467 | } | |
2468 | ||
2469 | static void packet_net_exit(struct net *net) | |
2470 | { | |
2471 | proc_net_remove(net, "packet"); | |
2472 | } | |
2473 | ||
2474 | static struct pernet_operations packet_net_ops = { | |
2475 | .init = packet_net_init, | |
2476 | .exit = packet_net_exit, | |
2477 | }; | |
2478 | ||
2479 | ||
1da177e4 LT |
2480 | static void __exit packet_exit(void) |
2481 | { | |
1da177e4 | 2482 | unregister_netdevice_notifier(&packet_netdev_notifier); |
d12d01d6 | 2483 | unregister_pernet_subsys(&packet_net_ops); |
1da177e4 LT |
2484 | sock_unregister(PF_PACKET); |
2485 | proto_unregister(&packet_proto); | |
2486 | } | |
2487 | ||
2488 | static int __init packet_init(void) | |
2489 | { | |
2490 | int rc = proto_register(&packet_proto, 0); | |
2491 | ||
2492 | if (rc != 0) | |
2493 | goto out; | |
2494 | ||
2495 | sock_register(&packet_family_ops); | |
d12d01d6 | 2496 | register_pernet_subsys(&packet_net_ops); |
1da177e4 | 2497 | register_netdevice_notifier(&packet_netdev_notifier); |
1da177e4 LT |
2498 | out: |
2499 | return rc; | |
2500 | } | |
2501 | ||
2502 | module_init(packet_init); | |
2503 | module_exit(packet_exit); | |
2504 | MODULE_LICENSE("GPL"); | |
2505 | MODULE_ALIAS_NETPROTO(PF_PACKET); |