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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * PACKET - implements raw packet sockets. | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
11 | * | |
1ce4f28b | 12 | * Fixes: |
1da177e4 LT |
13 | * Alan Cox : verify_area() now used correctly |
14 | * Alan Cox : new skbuff lists, look ma no backlogs! | |
15 | * Alan Cox : tidied skbuff lists. | |
16 | * Alan Cox : Now uses generic datagram routines I | |
17 | * added. Also fixed the peek/read crash | |
18 | * from all old Linux datagram code. | |
19 | * Alan Cox : Uses the improved datagram code. | |
20 | * Alan Cox : Added NULL's for socket options. | |
21 | * Alan Cox : Re-commented the code. | |
22 | * Alan Cox : Use new kernel side addressing | |
23 | * Rob Janssen : Correct MTU usage. | |
24 | * Dave Platt : Counter leaks caused by incorrect | |
25 | * interrupt locking and some slightly | |
26 | * dubious gcc output. Can you read | |
27 | * compiler: it said _VOLATILE_ | |
28 | * Richard Kooijman : Timestamp fixes. | |
29 | * Alan Cox : New buffers. Use sk->mac.raw. | |
30 | * Alan Cox : sendmsg/recvmsg support. | |
31 | * Alan Cox : Protocol setting support | |
32 | * Alexey Kuznetsov : Untied from IPv4 stack. | |
33 | * Cyrus Durgin : Fixed kerneld for kmod. | |
34 | * Michal Ostrowski : Module initialization cleanup. | |
1ce4f28b | 35 | * Ulises Alonso : Frame number limit removal and |
1da177e4 | 36 | * packet_set_ring memory leak. |
0fb375fb EB |
37 | * Eric Biederman : Allow for > 8 byte hardware addresses. |
38 | * The convention is that longer addresses | |
39 | * will simply extend the hardware address | |
1ce4f28b | 40 | * byte arrays at the end of sockaddr_ll |
0fb375fb | 41 | * and packet_mreq. |
69e3c75f | 42 | * Johann Baudy : Added TX RING. |
1da177e4 LT |
43 | * |
44 | * This program is free software; you can redistribute it and/or | |
45 | * modify it under the terms of the GNU General Public License | |
46 | * as published by the Free Software Foundation; either version | |
47 | * 2 of the License, or (at your option) any later version. | |
48 | * | |
49 | */ | |
1ce4f28b | 50 | |
1da177e4 | 51 | #include <linux/types.h> |
1da177e4 | 52 | #include <linux/mm.h> |
4fc268d2 | 53 | #include <linux/capability.h> |
1da177e4 LT |
54 | #include <linux/fcntl.h> |
55 | #include <linux/socket.h> | |
56 | #include <linux/in.h> | |
57 | #include <linux/inet.h> | |
58 | #include <linux/netdevice.h> | |
59 | #include <linux/if_packet.h> | |
60 | #include <linux/wireless.h> | |
ffbc6111 | 61 | #include <linux/kernel.h> |
1da177e4 | 62 | #include <linux/kmod.h> |
457c4cbc | 63 | #include <net/net_namespace.h> |
1da177e4 LT |
64 | #include <net/ip.h> |
65 | #include <net/protocol.h> | |
66 | #include <linux/skbuff.h> | |
67 | #include <net/sock.h> | |
68 | #include <linux/errno.h> | |
69 | #include <linux/timer.h> | |
70 | #include <asm/system.h> | |
71 | #include <asm/uaccess.h> | |
72 | #include <asm/ioctls.h> | |
73 | #include <asm/page.h> | |
a1f8e7f7 | 74 | #include <asm/cacheflush.h> |
1da177e4 LT |
75 | #include <asm/io.h> |
76 | #include <linux/proc_fs.h> | |
77 | #include <linux/seq_file.h> | |
78 | #include <linux/poll.h> | |
79 | #include <linux/module.h> | |
80 | #include <linux/init.h> | |
905db440 | 81 | #include <linux/mutex.h> |
05423b24 | 82 | #include <linux/if_vlan.h> |
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 | ||
3b1e0a65 | 368 | if (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; |
1da177e4 LT |
418 | struct sk_buff *skb; |
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; | |
654d1f8a ED |
440 | rcu_read_lock(); |
441 | dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); | |
1da177e4 LT |
442 | err = -ENODEV; |
443 | if (dev == NULL) | |
444 | goto out_unlock; | |
1ce4f28b | 445 | |
d5e76b0a DM |
446 | err = -ENETDOWN; |
447 | if (!(dev->flags & IFF_UP)) | |
448 | goto out_unlock; | |
449 | ||
1da177e4 | 450 | /* |
40d4e3df ED |
451 | * You may not queue a frame bigger than the mtu. This is the lowest level |
452 | * raw protocol and you must do your own fragmentation at this level. | |
1da177e4 | 453 | */ |
1ce4f28b | 454 | |
1da177e4 | 455 | err = -EMSGSIZE; |
8ae55f04 | 456 | if (len > dev->mtu + dev->hard_header_len) |
1da177e4 LT |
457 | goto out_unlock; |
458 | ||
459 | err = -ENOBUFS; | |
460 | skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL); | |
461 | ||
462 | /* | |
40d4e3df ED |
463 | * If the write buffer is full, then tough. At this level the user |
464 | * gets to deal with the problem - do your own algorithmic backoffs. | |
465 | * That's far more flexible. | |
1da177e4 | 466 | */ |
1ce4f28b YH |
467 | |
468 | if (skb == NULL) | |
1da177e4 LT |
469 | goto out_unlock; |
470 | ||
471 | /* | |
1ce4f28b | 472 | * Fill it in |
1da177e4 | 473 | */ |
1ce4f28b | 474 | |
1da177e4 LT |
475 | /* FIXME: Save some space for broken drivers that write a |
476 | * hard header at transmission time by themselves. PPP is the | |
477 | * notable one here. This should really be fixed at the driver level. | |
478 | */ | |
479 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
c1d2bbe1 | 480 | skb_reset_network_header(skb); |
1da177e4 LT |
481 | |
482 | /* Try to align data part correctly */ | |
3b04ddde | 483 | if (dev->header_ops) { |
1da177e4 LT |
484 | skb->data -= dev->hard_header_len; |
485 | skb->tail -= dev->hard_header_len; | |
486 | if (len < dev->hard_header_len) | |
c1d2bbe1 | 487 | skb_reset_network_header(skb); |
1da177e4 LT |
488 | } |
489 | ||
490 | /* Returns -EFAULT on error */ | |
40d4e3df | 491 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
1da177e4 LT |
492 | skb->protocol = proto; |
493 | skb->dev = dev; | |
494 | skb->priority = sk->sk_priority; | |
2d37a186 | 495 | skb->mark = sk->sk_mark; |
1da177e4 LT |
496 | if (err) |
497 | goto out_free; | |
498 | ||
1da177e4 LT |
499 | /* |
500 | * Now send it | |
501 | */ | |
502 | ||
503 | dev_queue_xmit(skb); | |
654d1f8a | 504 | rcu_read_unlock(); |
40d4e3df | 505 | return len; |
1da177e4 LT |
506 | |
507 | out_free: | |
508 | kfree_skb(skb); | |
509 | out_unlock: | |
654d1f8a | 510 | rcu_read_unlock(); |
1da177e4 LT |
511 | return err; |
512 | } | |
1da177e4 | 513 | |
dbcb5855 DM |
514 | static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk, |
515 | unsigned int res) | |
1da177e4 LT |
516 | { |
517 | struct sk_filter *filter; | |
fda9ef5d DM |
518 | |
519 | rcu_read_lock_bh(); | |
520 | filter = rcu_dereference(sk->sk_filter); | |
dbcb5855 DM |
521 | if (filter != NULL) |
522 | res = sk_run_filter(skb, filter->insns, filter->len); | |
fda9ef5d | 523 | rcu_read_unlock_bh(); |
1da177e4 | 524 | |
dbcb5855 | 525 | return res; |
1da177e4 LT |
526 | } |
527 | ||
528 | /* | |
529 | This function makes lazy skb cloning in hope that most of packets | |
530 | are discarded by BPF. | |
531 | ||
532 | Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
533 | and skb->cb are mangled. It works because (and until) packets | |
534 | falling here are owned by current CPU. Output packets are cloned | |
535 | by dev_queue_xmit_nit(), input packets are processed by net_bh | |
536 | sequencially, so that if we return skb to original state on exit, | |
537 | we will not harm anyone. | |
538 | */ | |
539 | ||
40d4e3df ED |
540 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
541 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
542 | { |
543 | struct sock *sk; | |
544 | struct sockaddr_ll *sll; | |
545 | struct packet_sock *po; | |
40d4e3df | 546 | u8 *skb_head = skb->data; |
1da177e4 | 547 | int skb_len = skb->len; |
dbcb5855 | 548 | unsigned int snaplen, res; |
1da177e4 LT |
549 | |
550 | if (skb->pkt_type == PACKET_LOOPBACK) | |
551 | goto drop; | |
552 | ||
553 | sk = pt->af_packet_priv; | |
554 | po = pkt_sk(sk); | |
555 | ||
3b1e0a65 | 556 | if (dev_net(dev) != sock_net(sk)) |
d12d01d6 DL |
557 | goto drop; |
558 | ||
1da177e4 LT |
559 | skb->dev = dev; |
560 | ||
3b04ddde | 561 | if (dev->header_ops) { |
1da177e4 LT |
562 | /* The device has an explicit notion of ll header, |
563 | exported to higher levels. | |
564 | ||
565 | Otherwise, the device hides datails of it frame | |
566 | structure, so that corresponding packet head | |
567 | never delivered to user. | |
568 | */ | |
569 | if (sk->sk_type != SOCK_DGRAM) | |
98e399f8 | 570 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
571 | else if (skb->pkt_type == PACKET_OUTGOING) { |
572 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 573 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
574 | } |
575 | } | |
576 | ||
577 | snaplen = skb->len; | |
578 | ||
dbcb5855 DM |
579 | res = run_filter(skb, sk, snaplen); |
580 | if (!res) | |
fda9ef5d | 581 | goto drop_n_restore; |
dbcb5855 DM |
582 | if (snaplen > res) |
583 | snaplen = res; | |
1da177e4 LT |
584 | |
585 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
586 | (unsigned)sk->sk_rcvbuf) | |
587 | goto drop_n_acct; | |
588 | ||
589 | if (skb_shared(skb)) { | |
590 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
591 | if (nskb == NULL) | |
592 | goto drop_n_acct; | |
593 | ||
594 | if (skb_head != skb->data) { | |
595 | skb->data = skb_head; | |
596 | skb->len = skb_len; | |
597 | } | |
598 | kfree_skb(skb); | |
599 | skb = nskb; | |
600 | } | |
601 | ||
ffbc6111 HX |
602 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
603 | sizeof(skb->cb)); | |
604 | ||
605 | sll = &PACKET_SKB_CB(skb)->sa.ll; | |
1da177e4 LT |
606 | sll->sll_family = AF_PACKET; |
607 | sll->sll_hatype = dev->type; | |
608 | sll->sll_protocol = skb->protocol; | |
609 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 610 | if (unlikely(po->origdev)) |
80feaacb PWJ |
611 | sll->sll_ifindex = orig_dev->ifindex; |
612 | else | |
613 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 614 | |
b95cce35 | 615 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 | 616 | |
ffbc6111 | 617 | PACKET_SKB_CB(skb)->origlen = skb->len; |
8dc41944 | 618 | |
1da177e4 LT |
619 | if (pskb_trim(skb, snaplen)) |
620 | goto drop_n_acct; | |
621 | ||
622 | skb_set_owner_r(skb, sk); | |
623 | skb->dev = NULL; | |
adf30907 | 624 | skb_dst_drop(skb); |
1da177e4 | 625 | |
84531c24 PO |
626 | /* drop conntrack reference */ |
627 | nf_reset(skb); | |
628 | ||
1da177e4 LT |
629 | spin_lock(&sk->sk_receive_queue.lock); |
630 | po->stats.tp_packets++; | |
3b885787 | 631 | skb->dropcount = atomic_read(&sk->sk_drops); |
1da177e4 LT |
632 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
633 | spin_unlock(&sk->sk_receive_queue.lock); | |
634 | sk->sk_data_ready(sk, skb->len); | |
635 | return 0; | |
636 | ||
637 | drop_n_acct: | |
3b885787 | 638 | po->stats.tp_drops = atomic_inc_return(&sk->sk_drops); |
1da177e4 LT |
639 | |
640 | drop_n_restore: | |
641 | if (skb_head != skb->data && skb_shared(skb)) { | |
642 | skb->data = skb_head; | |
643 | skb->len = skb_len; | |
644 | } | |
645 | drop: | |
ead2ceb0 | 646 | consume_skb(skb); |
1da177e4 LT |
647 | return 0; |
648 | } | |
649 | ||
650 | #ifdef CONFIG_PACKET_MMAP | |
40d4e3df ED |
651 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
652 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
653 | { |
654 | struct sock *sk; | |
655 | struct packet_sock *po; | |
656 | struct sockaddr_ll *sll; | |
bbd6ef87 PM |
657 | union { |
658 | struct tpacket_hdr *h1; | |
659 | struct tpacket2_hdr *h2; | |
660 | void *raw; | |
661 | } h; | |
40d4e3df | 662 | u8 *skb_head = skb->data; |
1da177e4 | 663 | int skb_len = skb->len; |
dbcb5855 | 664 | unsigned int snaplen, res; |
1da177e4 | 665 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
bbd6ef87 | 666 | unsigned short macoff, netoff, hdrlen; |
1da177e4 | 667 | struct sk_buff *copy_skb = NULL; |
b7aa0bf7 | 668 | struct timeval tv; |
bbd6ef87 | 669 | struct timespec ts; |
1da177e4 LT |
670 | |
671 | if (skb->pkt_type == PACKET_LOOPBACK) | |
672 | goto drop; | |
673 | ||
674 | sk = pt->af_packet_priv; | |
675 | po = pkt_sk(sk); | |
676 | ||
3b1e0a65 | 677 | if (dev_net(dev) != sock_net(sk)) |
d12d01d6 DL |
678 | goto drop; |
679 | ||
3b04ddde | 680 | if (dev->header_ops) { |
1da177e4 | 681 | if (sk->sk_type != SOCK_DGRAM) |
98e399f8 | 682 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
683 | else if (skb->pkt_type == PACKET_OUTGOING) { |
684 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 685 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
686 | } |
687 | } | |
688 | ||
8dc41944 HX |
689 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
690 | status |= TP_STATUS_CSUMNOTREADY; | |
691 | ||
1da177e4 LT |
692 | snaplen = skb->len; |
693 | ||
dbcb5855 DM |
694 | res = run_filter(skb, sk, snaplen); |
695 | if (!res) | |
fda9ef5d | 696 | goto drop_n_restore; |
dbcb5855 DM |
697 | if (snaplen > res) |
698 | snaplen = res; | |
1da177e4 LT |
699 | |
700 | if (sk->sk_type == SOCK_DGRAM) { | |
8913336a PM |
701 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
702 | po->tp_reserve; | |
1da177e4 | 703 | } else { |
bbe735e4 | 704 | unsigned maclen = skb_network_offset(skb); |
bbd6ef87 | 705 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
8913336a PM |
706 | (maclen < 16 ? 16 : maclen)) + |
707 | po->tp_reserve; | |
1da177e4 LT |
708 | macoff = netoff - maclen; |
709 | } | |
710 | ||
69e3c75f | 711 | if (macoff + snaplen > po->rx_ring.frame_size) { |
1da177e4 LT |
712 | if (po->copy_thresh && |
713 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < | |
714 | (unsigned)sk->sk_rcvbuf) { | |
715 | if (skb_shared(skb)) { | |
716 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
717 | } else { | |
718 | copy_skb = skb_get(skb); | |
719 | skb_head = skb->data; | |
720 | } | |
721 | if (copy_skb) | |
722 | skb_set_owner_r(copy_skb, sk); | |
723 | } | |
69e3c75f | 724 | snaplen = po->rx_ring.frame_size - macoff; |
1da177e4 LT |
725 | if ((int)snaplen < 0) |
726 | snaplen = 0; | |
727 | } | |
1da177e4 LT |
728 | |
729 | spin_lock(&sk->sk_receive_queue.lock); | |
69e3c75f | 730 | h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL); |
bbd6ef87 | 731 | if (!h.raw) |
1da177e4 | 732 | goto ring_is_full; |
69e3c75f | 733 | packet_increment_head(&po->rx_ring); |
1da177e4 LT |
734 | po->stats.tp_packets++; |
735 | if (copy_skb) { | |
736 | status |= TP_STATUS_COPY; | |
737 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
738 | } | |
739 | if (!po->stats.tp_drops) | |
740 | status &= ~TP_STATUS_LOSING; | |
741 | spin_unlock(&sk->sk_receive_queue.lock); | |
742 | ||
bbd6ef87 | 743 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
1da177e4 | 744 | |
bbd6ef87 PM |
745 | switch (po->tp_version) { |
746 | case TPACKET_V1: | |
747 | h.h1->tp_len = skb->len; | |
748 | h.h1->tp_snaplen = snaplen; | |
749 | h.h1->tp_mac = macoff; | |
750 | h.h1->tp_net = netoff; | |
751 | if (skb->tstamp.tv64) | |
752 | tv = ktime_to_timeval(skb->tstamp); | |
753 | else | |
754 | do_gettimeofday(&tv); | |
755 | h.h1->tp_sec = tv.tv_sec; | |
756 | h.h1->tp_usec = tv.tv_usec; | |
757 | hdrlen = sizeof(*h.h1); | |
758 | break; | |
759 | case TPACKET_V2: | |
760 | h.h2->tp_len = skb->len; | |
761 | h.h2->tp_snaplen = snaplen; | |
762 | h.h2->tp_mac = macoff; | |
763 | h.h2->tp_net = netoff; | |
764 | if (skb->tstamp.tv64) | |
765 | ts = ktime_to_timespec(skb->tstamp); | |
766 | else | |
767 | getnstimeofday(&ts); | |
768 | h.h2->tp_sec = ts.tv_sec; | |
769 | h.h2->tp_nsec = ts.tv_nsec; | |
05423b24 | 770 | h.h2->tp_vlan_tci = vlan_tx_tag_get(skb); |
bbd6ef87 PM |
771 | hdrlen = sizeof(*h.h2); |
772 | break; | |
773 | default: | |
774 | BUG(); | |
775 | } | |
1da177e4 | 776 | |
bbd6ef87 | 777 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
b95cce35 | 778 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 LT |
779 | sll->sll_family = AF_PACKET; |
780 | sll->sll_hatype = dev->type; | |
781 | sll->sll_protocol = skb->protocol; | |
782 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 783 | if (unlikely(po->origdev)) |
80feaacb PWJ |
784 | sll->sll_ifindex = orig_dev->ifindex; |
785 | else | |
786 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 787 | |
bbd6ef87 | 788 | __packet_set_status(po, h.raw, status); |
e16aa207 | 789 | smp_mb(); |
1da177e4 LT |
790 | { |
791 | struct page *p_start, *p_end; | |
bbd6ef87 | 792 | u8 *h_end = h.raw + macoff + snaplen - 1; |
1da177e4 | 793 | |
bbd6ef87 | 794 | p_start = virt_to_page(h.raw); |
1da177e4 LT |
795 | p_end = virt_to_page(h_end); |
796 | while (p_start <= p_end) { | |
797 | flush_dcache_page(p_start); | |
798 | p_start++; | |
799 | } | |
800 | } | |
801 | ||
802 | sk->sk_data_ready(sk, 0); | |
803 | ||
804 | drop_n_restore: | |
805 | if (skb_head != skb->data && skb_shared(skb)) { | |
806 | skb->data = skb_head; | |
807 | skb->len = skb_len; | |
808 | } | |
809 | drop: | |
1ce4f28b | 810 | kfree_skb(skb); |
1da177e4 LT |
811 | return 0; |
812 | ||
813 | ring_is_full: | |
814 | po->stats.tp_drops++; | |
815 | spin_unlock(&sk->sk_receive_queue.lock); | |
816 | ||
817 | sk->sk_data_ready(sk, 0); | |
acb5d75b | 818 | kfree_skb(copy_skb); |
1da177e4 LT |
819 | goto drop_n_restore; |
820 | } | |
821 | ||
69e3c75f JB |
822 | static void tpacket_destruct_skb(struct sk_buff *skb) |
823 | { | |
824 | struct packet_sock *po = pkt_sk(skb->sk); | |
40d4e3df | 825 | void *ph; |
1da177e4 | 826 | |
69e3c75f | 827 | BUG_ON(skb == NULL); |
1da177e4 | 828 | |
69e3c75f JB |
829 | if (likely(po->tx_ring.pg_vec)) { |
830 | ph = skb_shinfo(skb)->destructor_arg; | |
831 | BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING); | |
832 | BUG_ON(atomic_read(&po->tx_ring.pending) == 0); | |
833 | atomic_dec(&po->tx_ring.pending); | |
834 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE); | |
835 | } | |
836 | ||
837 | sock_wfree(skb); | |
838 | } | |
839 | ||
40d4e3df ED |
840 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
841 | void *frame, struct net_device *dev, int size_max, | |
842 | __be16 proto, unsigned char *addr) | |
69e3c75f JB |
843 | { |
844 | union { | |
845 | struct tpacket_hdr *h1; | |
846 | struct tpacket2_hdr *h2; | |
847 | void *raw; | |
848 | } ph; | |
849 | int to_write, offset, len, tp_len, nr_frags, len_max; | |
850 | struct socket *sock = po->sk.sk_socket; | |
851 | struct page *page; | |
852 | void *data; | |
853 | int err; | |
854 | ||
855 | ph.raw = frame; | |
856 | ||
857 | skb->protocol = proto; | |
858 | skb->dev = dev; | |
859 | skb->priority = po->sk.sk_priority; | |
2d37a186 | 860 | skb->mark = po->sk.sk_mark; |
69e3c75f JB |
861 | skb_shinfo(skb)->destructor_arg = ph.raw; |
862 | ||
863 | switch (po->tp_version) { | |
864 | case TPACKET_V2: | |
865 | tp_len = ph.h2->tp_len; | |
866 | break; | |
867 | default: | |
868 | tp_len = ph.h1->tp_len; | |
869 | break; | |
870 | } | |
871 | if (unlikely(tp_len > size_max)) { | |
40d4e3df | 872 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); |
69e3c75f JB |
873 | return -EMSGSIZE; |
874 | } | |
875 | ||
876 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
877 | skb_reset_network_header(skb); | |
878 | ||
879 | data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll); | |
880 | to_write = tp_len; | |
881 | ||
882 | if (sock->type == SOCK_DGRAM) { | |
883 | err = dev_hard_header(skb, dev, ntohs(proto), addr, | |
884 | NULL, tp_len); | |
885 | if (unlikely(err < 0)) | |
886 | return -EINVAL; | |
40d4e3df | 887 | } else if (dev->hard_header_len) { |
69e3c75f JB |
888 | /* net device doesn't like empty head */ |
889 | if (unlikely(tp_len <= dev->hard_header_len)) { | |
40d4e3df ED |
890 | pr_err("packet size is too short (%d < %d)\n", |
891 | tp_len, dev->hard_header_len); | |
69e3c75f JB |
892 | return -EINVAL; |
893 | } | |
894 | ||
895 | skb_push(skb, dev->hard_header_len); | |
896 | err = skb_store_bits(skb, 0, data, | |
897 | dev->hard_header_len); | |
898 | if (unlikely(err)) | |
899 | return err; | |
900 | ||
901 | data += dev->hard_header_len; | |
902 | to_write -= dev->hard_header_len; | |
903 | } | |
904 | ||
905 | err = -EFAULT; | |
906 | page = virt_to_page(data); | |
907 | offset = offset_in_page(data); | |
908 | len_max = PAGE_SIZE - offset; | |
909 | len = ((to_write > len_max) ? len_max : to_write); | |
910 | ||
911 | skb->data_len = to_write; | |
912 | skb->len += to_write; | |
913 | skb->truesize += to_write; | |
914 | atomic_add(to_write, &po->sk.sk_wmem_alloc); | |
915 | ||
916 | while (likely(to_write)) { | |
917 | nr_frags = skb_shinfo(skb)->nr_frags; | |
918 | ||
919 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { | |
40d4e3df ED |
920 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
921 | MAX_SKB_FRAGS); | |
69e3c75f JB |
922 | return -EFAULT; |
923 | } | |
924 | ||
925 | flush_dcache_page(page); | |
926 | get_page(page); | |
927 | skb_fill_page_desc(skb, | |
928 | nr_frags, | |
929 | page++, offset, len); | |
930 | to_write -= len; | |
931 | offset = 0; | |
932 | len_max = PAGE_SIZE; | |
933 | len = ((to_write > len_max) ? len_max : to_write); | |
934 | } | |
935 | ||
936 | return tp_len; | |
937 | } | |
938 | ||
939 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) | |
940 | { | |
941 | struct socket *sock; | |
942 | struct sk_buff *skb; | |
943 | struct net_device *dev; | |
944 | __be16 proto; | |
945 | int ifindex, err, reserve = 0; | |
40d4e3df ED |
946 | void *ph; |
947 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; | |
69e3c75f JB |
948 | int tp_len, size_max; |
949 | unsigned char *addr; | |
950 | int len_sum = 0; | |
951 | int status = 0; | |
952 | ||
953 | sock = po->sk.sk_socket; | |
954 | ||
955 | mutex_lock(&po->pg_vec_lock); | |
956 | ||
957 | err = -EBUSY; | |
958 | if (saddr == NULL) { | |
959 | ifindex = po->ifindex; | |
960 | proto = po->num; | |
961 | addr = NULL; | |
962 | } else { | |
963 | err = -EINVAL; | |
964 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
965 | goto out; | |
966 | if (msg->msg_namelen < (saddr->sll_halen | |
967 | + offsetof(struct sockaddr_ll, | |
968 | sll_addr))) | |
969 | goto out; | |
970 | ifindex = saddr->sll_ifindex; | |
971 | proto = saddr->sll_protocol; | |
972 | addr = saddr->sll_addr; | |
973 | } | |
974 | ||
975 | dev = dev_get_by_index(sock_net(&po->sk), ifindex); | |
976 | err = -ENXIO; | |
977 | if (unlikely(dev == NULL)) | |
978 | goto out; | |
979 | ||
980 | reserve = dev->hard_header_len; | |
981 | ||
982 | err = -ENETDOWN; | |
983 | if (unlikely(!(dev->flags & IFF_UP))) | |
984 | goto out_put; | |
985 | ||
986 | size_max = po->tx_ring.frame_size | |
b5dd884e | 987 | - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
69e3c75f JB |
988 | |
989 | if (size_max > dev->mtu + reserve) | |
990 | size_max = dev->mtu + reserve; | |
991 | ||
992 | do { | |
993 | ph = packet_current_frame(po, &po->tx_ring, | |
994 | TP_STATUS_SEND_REQUEST); | |
995 | ||
996 | if (unlikely(ph == NULL)) { | |
997 | schedule(); | |
998 | continue; | |
999 | } | |
1000 | ||
1001 | status = TP_STATUS_SEND_REQUEST; | |
1002 | skb = sock_alloc_send_skb(&po->sk, | |
1003 | LL_ALLOCATED_SPACE(dev) | |
1004 | + sizeof(struct sockaddr_ll), | |
1005 | 0, &err); | |
1006 | ||
1007 | if (unlikely(skb == NULL)) | |
1008 | goto out_status; | |
1009 | ||
1010 | tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto, | |
1011 | addr); | |
1012 | ||
1013 | if (unlikely(tp_len < 0)) { | |
1014 | if (po->tp_loss) { | |
1015 | __packet_set_status(po, ph, | |
1016 | TP_STATUS_AVAILABLE); | |
1017 | packet_increment_head(&po->tx_ring); | |
1018 | kfree_skb(skb); | |
1019 | continue; | |
1020 | } else { | |
1021 | status = TP_STATUS_WRONG_FORMAT; | |
1022 | err = tp_len; | |
1023 | goto out_status; | |
1024 | } | |
1025 | } | |
1026 | ||
1027 | skb->destructor = tpacket_destruct_skb; | |
1028 | __packet_set_status(po, ph, TP_STATUS_SENDING); | |
1029 | atomic_inc(&po->tx_ring.pending); | |
1030 | ||
1031 | status = TP_STATUS_SEND_REQUEST; | |
1032 | err = dev_queue_xmit(skb); | |
1033 | if (unlikely(err > 0 && (err = net_xmit_errno(err)) != 0)) | |
1034 | goto out_xmit; | |
1035 | packet_increment_head(&po->tx_ring); | |
1036 | len_sum += tp_len; | |
40d4e3df | 1037 | } while (likely((ph != NULL) || ((!(msg->msg_flags & MSG_DONTWAIT)) |
69e3c75f JB |
1038 | && (atomic_read(&po->tx_ring.pending)))) |
1039 | ); | |
1040 | ||
1041 | err = len_sum; | |
1042 | goto out_put; | |
1043 | ||
1044 | out_xmit: | |
1045 | skb->destructor = sock_wfree; | |
1046 | atomic_dec(&po->tx_ring.pending); | |
1047 | out_status: | |
1048 | __packet_set_status(po, ph, status); | |
1049 | kfree_skb(skb); | |
1050 | out_put: | |
1051 | dev_put(dev); | |
1052 | out: | |
1053 | mutex_unlock(&po->pg_vec_lock); | |
1054 | return err; | |
1055 | } | |
1056 | #endif | |
1057 | ||
1058 | static int packet_snd(struct socket *sock, | |
1da177e4 LT |
1059 | struct msghdr *msg, size_t len) |
1060 | { | |
1061 | struct sock *sk = sock->sk; | |
40d4e3df | 1062 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
1da177e4 LT |
1063 | struct sk_buff *skb; |
1064 | struct net_device *dev; | |
0e11c91e | 1065 | __be16 proto; |
1da177e4 LT |
1066 | unsigned char *addr; |
1067 | int ifindex, err, reserve = 0; | |
1068 | ||
1069 | /* | |
1ce4f28b | 1070 | * Get and verify the address. |
1da177e4 | 1071 | */ |
1ce4f28b | 1072 | |
1da177e4 LT |
1073 | if (saddr == NULL) { |
1074 | struct packet_sock *po = pkt_sk(sk); | |
1075 | ||
1076 | ifindex = po->ifindex; | |
1077 | proto = po->num; | |
1078 | addr = NULL; | |
1079 | } else { | |
1080 | err = -EINVAL; | |
1081 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
1082 | goto out; | |
0fb375fb EB |
1083 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
1084 | goto out; | |
1da177e4 LT |
1085 | ifindex = saddr->sll_ifindex; |
1086 | proto = saddr->sll_protocol; | |
1087 | addr = saddr->sll_addr; | |
1088 | } | |
1089 | ||
1090 | ||
3b1e0a65 | 1091 | dev = dev_get_by_index(sock_net(sk), ifindex); |
1da177e4 LT |
1092 | err = -ENXIO; |
1093 | if (dev == NULL) | |
1094 | goto out_unlock; | |
1095 | if (sock->type == SOCK_RAW) | |
1096 | reserve = dev->hard_header_len; | |
1097 | ||
d5e76b0a DM |
1098 | err = -ENETDOWN; |
1099 | if (!(dev->flags & IFF_UP)) | |
1100 | goto out_unlock; | |
1101 | ||
1da177e4 LT |
1102 | err = -EMSGSIZE; |
1103 | if (len > dev->mtu+reserve) | |
1104 | goto out_unlock; | |
1105 | ||
f5184d26 | 1106 | skb = sock_alloc_send_skb(sk, len + LL_ALLOCATED_SPACE(dev), |
1da177e4 | 1107 | msg->msg_flags & MSG_DONTWAIT, &err); |
40d4e3df | 1108 | if (skb == NULL) |
1da177e4 LT |
1109 | goto out_unlock; |
1110 | ||
1111 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
c1d2bbe1 | 1112 | skb_reset_network_header(skb); |
1da177e4 | 1113 | |
0c4e8581 SH |
1114 | err = -EINVAL; |
1115 | if (sock->type == SOCK_DGRAM && | |
1116 | dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len) < 0) | |
1117 | goto out_free; | |
1da177e4 LT |
1118 | |
1119 | /* Returns -EFAULT on error */ | |
40d4e3df | 1120 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
1da177e4 LT |
1121 | if (err) |
1122 | goto out_free; | |
1123 | ||
1124 | skb->protocol = proto; | |
1125 | skb->dev = dev; | |
1126 | skb->priority = sk->sk_priority; | |
2d37a186 | 1127 | skb->mark = sk->sk_mark; |
1da177e4 | 1128 | |
1da177e4 LT |
1129 | /* |
1130 | * Now send it | |
1131 | */ | |
1132 | ||
1133 | err = dev_queue_xmit(skb); | |
1134 | if (err > 0 && (err = net_xmit_errno(err)) != 0) | |
1135 | goto out_unlock; | |
1136 | ||
1137 | dev_put(dev); | |
1138 | ||
40d4e3df | 1139 | return len; |
1da177e4 LT |
1140 | |
1141 | out_free: | |
1142 | kfree_skb(skb); | |
1143 | out_unlock: | |
1144 | if (dev) | |
1145 | dev_put(dev); | |
1146 | out: | |
1147 | return err; | |
1148 | } | |
1149 | ||
69e3c75f JB |
1150 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
1151 | struct msghdr *msg, size_t len) | |
1152 | { | |
1153 | #ifdef CONFIG_PACKET_MMAP | |
1154 | struct sock *sk = sock->sk; | |
1155 | struct packet_sock *po = pkt_sk(sk); | |
1156 | if (po->tx_ring.pg_vec) | |
1157 | return tpacket_snd(po, msg); | |
1158 | else | |
1159 | #endif | |
1160 | return packet_snd(sock, msg, len); | |
1161 | } | |
1162 | ||
1da177e4 LT |
1163 | /* |
1164 | * Close a PACKET socket. This is fairly simple. We immediately go | |
1165 | * to 'closed' state and remove our protocol entry in the device list. | |
1166 | */ | |
1167 | ||
1168 | static int packet_release(struct socket *sock) | |
1169 | { | |
1170 | struct sock *sk = sock->sk; | |
1171 | struct packet_sock *po; | |
d12d01d6 | 1172 | struct net *net; |
69e3c75f JB |
1173 | #ifdef CONFIG_PACKET_MMAP |
1174 | struct tpacket_req req; | |
1175 | #endif | |
1da177e4 LT |
1176 | |
1177 | if (!sk) | |
1178 | return 0; | |
1179 | ||
3b1e0a65 | 1180 | net = sock_net(sk); |
1da177e4 LT |
1181 | po = pkt_sk(sk); |
1182 | ||
2aaef4e4 | 1183 | write_lock_bh(&net->packet.sklist_lock); |
1da177e4 | 1184 | sk_del_node_init(sk); |
920de804 | 1185 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
2aaef4e4 | 1186 | write_unlock_bh(&net->packet.sklist_lock); |
1da177e4 LT |
1187 | |
1188 | /* | |
1189 | * Unhook packet receive handler. | |
1190 | */ | |
1191 | ||
1192 | if (po->running) { | |
1193 | /* | |
1194 | * Remove the protocol hook | |
1195 | */ | |
1196 | dev_remove_pack(&po->prot_hook); | |
1197 | po->running = 0; | |
1198 | po->num = 0; | |
1199 | __sock_put(sk); | |
1200 | } | |
1201 | ||
1da177e4 | 1202 | packet_flush_mclist(sk); |
1da177e4 LT |
1203 | |
1204 | #ifdef CONFIG_PACKET_MMAP | |
69e3c75f JB |
1205 | memset(&req, 0, sizeof(req)); |
1206 | ||
1207 | if (po->rx_ring.pg_vec) | |
1208 | packet_set_ring(sk, &req, 1, 0); | |
1209 | ||
1210 | if (po->tx_ring.pg_vec) | |
1211 | packet_set_ring(sk, &req, 1, 1); | |
1da177e4 LT |
1212 | #endif |
1213 | ||
1214 | /* | |
1215 | * Now the socket is dead. No more input will appear. | |
1216 | */ | |
1217 | ||
1218 | sock_orphan(sk); | |
1219 | sock->sk = NULL; | |
1220 | ||
1221 | /* Purge queues */ | |
1222 | ||
1223 | skb_queue_purge(&sk->sk_receive_queue); | |
17ab56a2 | 1224 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
1225 | |
1226 | sock_put(sk); | |
1227 | return 0; | |
1228 | } | |
1229 | ||
1230 | /* | |
1231 | * Attach a packet hook. | |
1232 | */ | |
1233 | ||
0e11c91e | 1234 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
1da177e4 LT |
1235 | { |
1236 | struct packet_sock *po = pkt_sk(sk); | |
1237 | /* | |
1238 | * Detach an existing hook if present. | |
1239 | */ | |
1240 | ||
1241 | lock_sock(sk); | |
1242 | ||
1243 | spin_lock(&po->bind_lock); | |
1244 | if (po->running) { | |
1245 | __sock_put(sk); | |
1246 | po->running = 0; | |
1247 | po->num = 0; | |
1248 | spin_unlock(&po->bind_lock); | |
1249 | dev_remove_pack(&po->prot_hook); | |
1250 | spin_lock(&po->bind_lock); | |
1251 | } | |
1252 | ||
1253 | po->num = protocol; | |
1254 | po->prot_hook.type = protocol; | |
1255 | po->prot_hook.dev = dev; | |
1256 | ||
1257 | po->ifindex = dev ? dev->ifindex : 0; | |
1258 | ||
1259 | if (protocol == 0) | |
1260 | goto out_unlock; | |
1261 | ||
be85d4ad | 1262 | if (!dev || (dev->flags & IFF_UP)) { |
1da177e4 LT |
1263 | dev_add_pack(&po->prot_hook); |
1264 | sock_hold(sk); | |
1265 | po->running = 1; | |
be85d4ad UT |
1266 | } else { |
1267 | sk->sk_err = ENETDOWN; | |
1268 | if (!sock_flag(sk, SOCK_DEAD)) | |
1269 | sk->sk_error_report(sk); | |
1da177e4 LT |
1270 | } |
1271 | ||
1272 | out_unlock: | |
1273 | spin_unlock(&po->bind_lock); | |
1274 | release_sock(sk); | |
1275 | return 0; | |
1276 | } | |
1277 | ||
1278 | /* | |
1279 | * Bind a packet socket to a device | |
1280 | */ | |
1281 | ||
40d4e3df ED |
1282 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
1283 | int addr_len) | |
1da177e4 | 1284 | { |
40d4e3df | 1285 | struct sock *sk = sock->sk; |
1da177e4 LT |
1286 | char name[15]; |
1287 | struct net_device *dev; | |
1288 | int err = -ENODEV; | |
1ce4f28b | 1289 | |
1da177e4 LT |
1290 | /* |
1291 | * Check legality | |
1292 | */ | |
1ce4f28b | 1293 | |
8ae55f04 | 1294 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 | 1295 | return -EINVAL; |
40d4e3df | 1296 | strlcpy(name, uaddr->sa_data, sizeof(name)); |
1da177e4 | 1297 | |
3b1e0a65 | 1298 | dev = dev_get_by_name(sock_net(sk), name); |
1da177e4 LT |
1299 | if (dev) { |
1300 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); | |
1301 | dev_put(dev); | |
1302 | } | |
1303 | return err; | |
1304 | } | |
1da177e4 LT |
1305 | |
1306 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
1307 | { | |
40d4e3df ED |
1308 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
1309 | struct sock *sk = sock->sk; | |
1da177e4 LT |
1310 | struct net_device *dev = NULL; |
1311 | int err; | |
1312 | ||
1313 | ||
1314 | /* | |
1315 | * Check legality | |
1316 | */ | |
1ce4f28b | 1317 | |
1da177e4 LT |
1318 | if (addr_len < sizeof(struct sockaddr_ll)) |
1319 | return -EINVAL; | |
1320 | if (sll->sll_family != AF_PACKET) | |
1321 | return -EINVAL; | |
1322 | ||
1323 | if (sll->sll_ifindex) { | |
1324 | err = -ENODEV; | |
3b1e0a65 | 1325 | dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex); |
1da177e4 LT |
1326 | if (dev == NULL) |
1327 | goto out; | |
1328 | } | |
1329 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
1330 | if (dev) | |
1331 | dev_put(dev); | |
1332 | ||
1333 | out: | |
1334 | return err; | |
1335 | } | |
1336 | ||
1337 | static struct proto packet_proto = { | |
1338 | .name = "PACKET", | |
1339 | .owner = THIS_MODULE, | |
1340 | .obj_size = sizeof(struct packet_sock), | |
1341 | }; | |
1342 | ||
1343 | /* | |
1ce4f28b | 1344 | * Create a packet of type SOCK_PACKET. |
1da177e4 LT |
1345 | */ |
1346 | ||
3f378b68 EP |
1347 | static int packet_create(struct net *net, struct socket *sock, int protocol, |
1348 | int kern) | |
1da177e4 LT |
1349 | { |
1350 | struct sock *sk; | |
1351 | struct packet_sock *po; | |
0e11c91e | 1352 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1da177e4 LT |
1353 | int err; |
1354 | ||
1355 | if (!capable(CAP_NET_RAW)) | |
1356 | return -EPERM; | |
be02097c DM |
1357 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
1358 | sock->type != SOCK_PACKET) | |
1da177e4 LT |
1359 | return -ESOCKTNOSUPPORT; |
1360 | ||
1361 | sock->state = SS_UNCONNECTED; | |
1362 | ||
1363 | err = -ENOBUFS; | |
6257ff21 | 1364 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto); |
1da177e4 LT |
1365 | if (sk == NULL) |
1366 | goto out; | |
1367 | ||
1368 | sock->ops = &packet_ops; | |
1da177e4 LT |
1369 | if (sock->type == SOCK_PACKET) |
1370 | sock->ops = &packet_ops_spkt; | |
be02097c | 1371 | |
1da177e4 LT |
1372 | sock_init_data(sock, sk); |
1373 | ||
1374 | po = pkt_sk(sk); | |
1375 | sk->sk_family = PF_PACKET; | |
0e11c91e | 1376 | po->num = proto; |
1da177e4 LT |
1377 | |
1378 | sk->sk_destruct = packet_sock_destruct; | |
17ab56a2 | 1379 | sk_refcnt_debug_inc(sk); |
1da177e4 LT |
1380 | |
1381 | /* | |
1382 | * Attach a protocol block | |
1383 | */ | |
1384 | ||
1385 | spin_lock_init(&po->bind_lock); | |
905db440 | 1386 | mutex_init(&po->pg_vec_lock); |
1da177e4 | 1387 | po->prot_hook.func = packet_rcv; |
be02097c | 1388 | |
1da177e4 LT |
1389 | if (sock->type == SOCK_PACKET) |
1390 | po->prot_hook.func = packet_rcv_spkt; | |
be02097c | 1391 | |
1da177e4 LT |
1392 | po->prot_hook.af_packet_priv = sk; |
1393 | ||
0e11c91e AV |
1394 | if (proto) { |
1395 | po->prot_hook.type = proto; | |
1da177e4 LT |
1396 | dev_add_pack(&po->prot_hook); |
1397 | sock_hold(sk); | |
1398 | po->running = 1; | |
1399 | } | |
1400 | ||
2aaef4e4 DL |
1401 | write_lock_bh(&net->packet.sklist_lock); |
1402 | sk_add_node(sk, &net->packet.sklist); | |
3680453c | 1403 | sock_prot_inuse_add(net, &packet_proto, 1); |
920de804 | 1404 | write_unlock_bh(&net->packet.sklist_lock); |
40d4e3df | 1405 | return 0; |
1da177e4 LT |
1406 | out: |
1407 | return err; | |
1408 | } | |
1409 | ||
1410 | /* | |
1411 | * Pull a packet from our receive queue and hand it to the user. | |
1412 | * If necessary we block. | |
1413 | */ | |
1414 | ||
1415 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1416 | struct msghdr *msg, size_t len, int flags) | |
1417 | { | |
1418 | struct sock *sk = sock->sk; | |
1419 | struct sk_buff *skb; | |
1420 | int copied, err; | |
0fb375fb | 1421 | struct sockaddr_ll *sll; |
1da177e4 LT |
1422 | |
1423 | err = -EINVAL; | |
1424 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) | |
1425 | goto out; | |
1426 | ||
1427 | #if 0 | |
1428 | /* What error should we return now? EUNATTACH? */ | |
1429 | if (pkt_sk(sk)->ifindex < 0) | |
1430 | return -ENODEV; | |
1431 | #endif | |
1432 | ||
1da177e4 LT |
1433 | /* |
1434 | * Call the generic datagram receiver. This handles all sorts | |
1435 | * of horrible races and re-entrancy so we can forget about it | |
1436 | * in the protocol layers. | |
1437 | * | |
1438 | * Now it will return ENETDOWN, if device have just gone down, | |
1439 | * but then it will block. | |
1440 | */ | |
1441 | ||
40d4e3df | 1442 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
1da177e4 LT |
1443 | |
1444 | /* | |
1ce4f28b | 1445 | * An error occurred so return it. Because skb_recv_datagram() |
1da177e4 LT |
1446 | * handles the blocking we don't see and worry about blocking |
1447 | * retries. | |
1448 | */ | |
1449 | ||
8ae55f04 | 1450 | if (skb == NULL) |
1da177e4 LT |
1451 | goto out; |
1452 | ||
0fb375fb EB |
1453 | /* |
1454 | * If the address length field is there to be filled in, we fill | |
1455 | * it in now. | |
1456 | */ | |
1457 | ||
ffbc6111 | 1458 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
0fb375fb EB |
1459 | if (sock->type == SOCK_PACKET) |
1460 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
1461 | else | |
1462 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); | |
1463 | ||
1da177e4 LT |
1464 | /* |
1465 | * You lose any data beyond the buffer you gave. If it worries a | |
1466 | * user program they can ask the device for its MTU anyway. | |
1467 | */ | |
1468 | ||
1469 | copied = skb->len; | |
40d4e3df ED |
1470 | if (copied > len) { |
1471 | copied = len; | |
1472 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 LT |
1473 | } |
1474 | ||
1475 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1476 | if (err) | |
1477 | goto out_free; | |
1478 | ||
3b885787 | 1479 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
1480 | |
1481 | if (msg->msg_name) | |
ffbc6111 HX |
1482 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
1483 | msg->msg_namelen); | |
1da177e4 | 1484 | |
8dc41944 | 1485 | if (pkt_sk(sk)->auxdata) { |
ffbc6111 HX |
1486 | struct tpacket_auxdata aux; |
1487 | ||
1488 | aux.tp_status = TP_STATUS_USER; | |
1489 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
1490 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; | |
1491 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; | |
1492 | aux.tp_snaplen = skb->len; | |
1493 | aux.tp_mac = 0; | |
bbe735e4 | 1494 | aux.tp_net = skb_network_offset(skb); |
05423b24 | 1495 | aux.tp_vlan_tci = vlan_tx_tag_get(skb); |
ffbc6111 HX |
1496 | |
1497 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); | |
8dc41944 HX |
1498 | } |
1499 | ||
1da177e4 LT |
1500 | /* |
1501 | * Free or return the buffer as appropriate. Again this | |
1502 | * hides all the races and re-entrancy issues from us. | |
1503 | */ | |
1504 | err = (flags&MSG_TRUNC) ? skb->len : copied; | |
1505 | ||
1506 | out_free: | |
1507 | skb_free_datagram(sk, skb); | |
1508 | out: | |
1509 | return err; | |
1510 | } | |
1511 | ||
1da177e4 LT |
1512 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
1513 | int *uaddr_len, int peer) | |
1514 | { | |
1515 | struct net_device *dev; | |
1516 | struct sock *sk = sock->sk; | |
1517 | ||
1518 | if (peer) | |
1519 | return -EOPNOTSUPP; | |
1520 | ||
1521 | uaddr->sa_family = AF_PACKET; | |
654d1f8a ED |
1522 | rcu_read_lock(); |
1523 | dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); | |
1524 | if (dev) | |
1da177e4 | 1525 | strlcpy(uaddr->sa_data, dev->name, 15); |
654d1f8a | 1526 | else |
1da177e4 | 1527 | memset(uaddr->sa_data, 0, 14); |
654d1f8a | 1528 | rcu_read_unlock(); |
1da177e4 LT |
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); | |
13cfa97b | 1540 | DECLARE_SOCKADDR(struct sockaddr_ll *, sll, 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; | |
654d1f8a ED |
1548 | rcu_read_lock(); |
1549 | dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex); | |
1da177e4 LT |
1550 | if (dev) { |
1551 | sll->sll_hatype = dev->type; | |
1552 | sll->sll_halen = dev->addr_len; | |
1553 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1da177e4 LT |
1554 | } else { |
1555 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
1556 | sll->sll_halen = 0; | |
1557 | } | |
654d1f8a | 1558 | rcu_read_unlock(); |
0fb375fb | 1559 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
1560 | |
1561 | return 0; | |
1562 | } | |
1563 | ||
2aeb0b88 WC |
1564 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
1565 | int what) | |
1da177e4 LT |
1566 | { |
1567 | switch (i->type) { | |
1568 | case PACKET_MR_MULTICAST: | |
1569 | if (what > 0) | |
d95ed927 | 1570 | return dev_mc_add(dev, i->addr, i->alen, 0); |
1da177e4 | 1571 | else |
d95ed927 | 1572 | return dev_mc_delete(dev, i->addr, i->alen, 0); |
1da177e4 LT |
1573 | break; |
1574 | case PACKET_MR_PROMISC: | |
2aeb0b88 | 1575 | return dev_set_promiscuity(dev, what); |
1da177e4 LT |
1576 | break; |
1577 | case PACKET_MR_ALLMULTI: | |
2aeb0b88 | 1578 | return dev_set_allmulti(dev, what); |
1da177e4 | 1579 | break; |
d95ed927 EB |
1580 | case PACKET_MR_UNICAST: |
1581 | if (what > 0) | |
ccffad25 | 1582 | return dev_unicast_add(dev, i->addr); |
d95ed927 | 1583 | else |
ccffad25 | 1584 | return dev_unicast_delete(dev, i->addr); |
d95ed927 | 1585 | break; |
40d4e3df ED |
1586 | default: |
1587 | break; | |
1da177e4 | 1588 | } |
2aeb0b88 | 1589 | return 0; |
1da177e4 LT |
1590 | } |
1591 | ||
1592 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
1593 | { | |
40d4e3df | 1594 | for ( ; i; i = i->next) { |
1da177e4 LT |
1595 | if (i->ifindex == dev->ifindex) |
1596 | packet_dev_mc(dev, i, what); | |
1597 | } | |
1598 | } | |
1599 | ||
0fb375fb | 1600 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1601 | { |
1602 | struct packet_sock *po = pkt_sk(sk); | |
1603 | struct packet_mclist *ml, *i; | |
1604 | struct net_device *dev; | |
1605 | int err; | |
1606 | ||
1607 | rtnl_lock(); | |
1608 | ||
1609 | err = -ENODEV; | |
3b1e0a65 | 1610 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
1da177e4 LT |
1611 | if (!dev) |
1612 | goto done; | |
1613 | ||
1614 | err = -EINVAL; | |
1615 | if (mreq->mr_alen > dev->addr_len) | |
1616 | goto done; | |
1617 | ||
1618 | err = -ENOBUFS; | |
8b3a7005 | 1619 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
1620 | if (i == NULL) |
1621 | goto done; | |
1622 | ||
1623 | err = 0; | |
1624 | for (ml = po->mclist; ml; ml = ml->next) { | |
1625 | if (ml->ifindex == mreq->mr_ifindex && | |
1626 | ml->type == mreq->mr_type && | |
1627 | ml->alen == mreq->mr_alen && | |
1628 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1629 | ml->count++; | |
1630 | /* Free the new element ... */ | |
1631 | kfree(i); | |
1632 | goto done; | |
1633 | } | |
1634 | } | |
1635 | ||
1636 | i->type = mreq->mr_type; | |
1637 | i->ifindex = mreq->mr_ifindex; | |
1638 | i->alen = mreq->mr_alen; | |
1639 | memcpy(i->addr, mreq->mr_address, i->alen); | |
1640 | i->count = 1; | |
1641 | i->next = po->mclist; | |
1642 | po->mclist = i; | |
2aeb0b88 WC |
1643 | err = packet_dev_mc(dev, i, 1); |
1644 | if (err) { | |
1645 | po->mclist = i->next; | |
1646 | kfree(i); | |
1647 | } | |
1da177e4 LT |
1648 | |
1649 | done: | |
1650 | rtnl_unlock(); | |
1651 | return err; | |
1652 | } | |
1653 | ||
0fb375fb | 1654 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1655 | { |
1656 | struct packet_mclist *ml, **mlp; | |
1657 | ||
1658 | rtnl_lock(); | |
1659 | ||
1660 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
1661 | if (ml->ifindex == mreq->mr_ifindex && | |
1662 | ml->type == mreq->mr_type && | |
1663 | ml->alen == mreq->mr_alen && | |
1664 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1665 | if (--ml->count == 0) { | |
1666 | struct net_device *dev; | |
1667 | *mlp = ml->next; | |
ad959e76 ED |
1668 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1669 | if (dev) | |
1da177e4 | 1670 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
1671 | kfree(ml); |
1672 | } | |
1673 | rtnl_unlock(); | |
1674 | return 0; | |
1675 | } | |
1676 | } | |
1677 | rtnl_unlock(); | |
1678 | return -EADDRNOTAVAIL; | |
1679 | } | |
1680 | ||
1681 | static void packet_flush_mclist(struct sock *sk) | |
1682 | { | |
1683 | struct packet_sock *po = pkt_sk(sk); | |
1684 | struct packet_mclist *ml; | |
1685 | ||
1686 | if (!po->mclist) | |
1687 | return; | |
1688 | ||
1689 | rtnl_lock(); | |
1690 | while ((ml = po->mclist) != NULL) { | |
1691 | struct net_device *dev; | |
1692 | ||
1693 | po->mclist = ml->next; | |
ad959e76 ED |
1694 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1695 | if (dev != NULL) | |
1da177e4 | 1696 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
1697 | kfree(ml); |
1698 | } | |
1699 | rtnl_unlock(); | |
1700 | } | |
1da177e4 LT |
1701 | |
1702 | static int | |
b7058842 | 1703 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1704 | { |
1705 | struct sock *sk = sock->sk; | |
8dc41944 | 1706 | struct packet_sock *po = pkt_sk(sk); |
1da177e4 LT |
1707 | int ret; |
1708 | ||
1709 | if (level != SOL_PACKET) | |
1710 | return -ENOPROTOOPT; | |
1711 | ||
69e3c75f | 1712 | switch (optname) { |
1ce4f28b | 1713 | case PACKET_ADD_MEMBERSHIP: |
1da177e4 LT |
1714 | case PACKET_DROP_MEMBERSHIP: |
1715 | { | |
0fb375fb EB |
1716 | struct packet_mreq_max mreq; |
1717 | int len = optlen; | |
1718 | memset(&mreq, 0, sizeof(mreq)); | |
1719 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 1720 | return -EINVAL; |
0fb375fb EB |
1721 | if (len > sizeof(mreq)) |
1722 | len = sizeof(mreq); | |
40d4e3df | 1723 | if (copy_from_user(&mreq, optval, len)) |
1da177e4 | 1724 | return -EFAULT; |
0fb375fb EB |
1725 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
1726 | return -EINVAL; | |
1da177e4 LT |
1727 | if (optname == PACKET_ADD_MEMBERSHIP) |
1728 | ret = packet_mc_add(sk, &mreq); | |
1729 | else | |
1730 | ret = packet_mc_drop(sk, &mreq); | |
1731 | return ret; | |
1732 | } | |
a2efcfa0 | 1733 | |
1da177e4 LT |
1734 | #ifdef CONFIG_PACKET_MMAP |
1735 | case PACKET_RX_RING: | |
69e3c75f | 1736 | case PACKET_TX_RING: |
1da177e4 LT |
1737 | { |
1738 | struct tpacket_req req; | |
1739 | ||
40d4e3df | 1740 | if (optlen < sizeof(req)) |
1da177e4 | 1741 | return -EINVAL; |
40d4e3df | 1742 | if (copy_from_user(&req, optval, sizeof(req))) |
1da177e4 | 1743 | return -EFAULT; |
69e3c75f | 1744 | return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING); |
1da177e4 LT |
1745 | } |
1746 | case PACKET_COPY_THRESH: | |
1747 | { | |
1748 | int val; | |
1749 | ||
40d4e3df | 1750 | if (optlen != sizeof(val)) |
1da177e4 | 1751 | return -EINVAL; |
40d4e3df | 1752 | if (copy_from_user(&val, optval, sizeof(val))) |
1da177e4 LT |
1753 | return -EFAULT; |
1754 | ||
1755 | pkt_sk(sk)->copy_thresh = val; | |
1756 | return 0; | |
1757 | } | |
bbd6ef87 PM |
1758 | case PACKET_VERSION: |
1759 | { | |
1760 | int val; | |
1761 | ||
1762 | if (optlen != sizeof(val)) | |
1763 | return -EINVAL; | |
69e3c75f | 1764 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
bbd6ef87 PM |
1765 | return -EBUSY; |
1766 | if (copy_from_user(&val, optval, sizeof(val))) | |
1767 | return -EFAULT; | |
1768 | switch (val) { | |
1769 | case TPACKET_V1: | |
1770 | case TPACKET_V2: | |
1771 | po->tp_version = val; | |
1772 | return 0; | |
1773 | default: | |
1774 | return -EINVAL; | |
1775 | } | |
1776 | } | |
8913336a PM |
1777 | case PACKET_RESERVE: |
1778 | { | |
1779 | unsigned int val; | |
1780 | ||
1781 | if (optlen != sizeof(val)) | |
1782 | return -EINVAL; | |
69e3c75f | 1783 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
8913336a PM |
1784 | return -EBUSY; |
1785 | if (copy_from_user(&val, optval, sizeof(val))) | |
1786 | return -EFAULT; | |
1787 | po->tp_reserve = val; | |
1788 | return 0; | |
1789 | } | |
69e3c75f JB |
1790 | case PACKET_LOSS: |
1791 | { | |
1792 | unsigned int val; | |
1793 | ||
1794 | if (optlen != sizeof(val)) | |
1795 | return -EINVAL; | |
1796 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
1797 | return -EBUSY; | |
1798 | if (copy_from_user(&val, optval, sizeof(val))) | |
1799 | return -EFAULT; | |
1800 | po->tp_loss = !!val; | |
1801 | return 0; | |
1802 | } | |
1da177e4 | 1803 | #endif |
8dc41944 HX |
1804 | case PACKET_AUXDATA: |
1805 | { | |
1806 | int val; | |
1807 | ||
1808 | if (optlen < sizeof(val)) | |
1809 | return -EINVAL; | |
1810 | if (copy_from_user(&val, optval, sizeof(val))) | |
1811 | return -EFAULT; | |
1812 | ||
1813 | po->auxdata = !!val; | |
1814 | return 0; | |
1815 | } | |
80feaacb PWJ |
1816 | case PACKET_ORIGDEV: |
1817 | { | |
1818 | int val; | |
1819 | ||
1820 | if (optlen < sizeof(val)) | |
1821 | return -EINVAL; | |
1822 | if (copy_from_user(&val, optval, sizeof(val))) | |
1823 | return -EFAULT; | |
1824 | ||
1825 | po->origdev = !!val; | |
1826 | return 0; | |
1827 | } | |
1da177e4 LT |
1828 | default: |
1829 | return -ENOPROTOOPT; | |
1830 | } | |
1831 | } | |
1832 | ||
1833 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
1834 | char __user *optval, int __user *optlen) | |
1835 | { | |
1836 | int len; | |
8dc41944 | 1837 | int val; |
1da177e4 LT |
1838 | struct sock *sk = sock->sk; |
1839 | struct packet_sock *po = pkt_sk(sk); | |
8dc41944 HX |
1840 | void *data; |
1841 | struct tpacket_stats st; | |
1da177e4 LT |
1842 | |
1843 | if (level != SOL_PACKET) | |
1844 | return -ENOPROTOOPT; | |
1845 | ||
8ae55f04 KK |
1846 | if (get_user(len, optlen)) |
1847 | return -EFAULT; | |
1da177e4 LT |
1848 | |
1849 | if (len < 0) | |
1850 | return -EINVAL; | |
1ce4f28b | 1851 | |
69e3c75f | 1852 | switch (optname) { |
1da177e4 | 1853 | case PACKET_STATISTICS: |
1da177e4 LT |
1854 | if (len > sizeof(struct tpacket_stats)) |
1855 | len = sizeof(struct tpacket_stats); | |
1856 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1857 | st = po->stats; | |
1858 | memset(&po->stats, 0, sizeof(st)); | |
1859 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1860 | st.tp_packets += st.tp_drops; | |
1861 | ||
8dc41944 HX |
1862 | data = &st; |
1863 | break; | |
1864 | case PACKET_AUXDATA: | |
1865 | if (len > sizeof(int)) | |
1866 | len = sizeof(int); | |
1867 | val = po->auxdata; | |
1868 | ||
80feaacb PWJ |
1869 | data = &val; |
1870 | break; | |
1871 | case PACKET_ORIGDEV: | |
1872 | if (len > sizeof(int)) | |
1873 | len = sizeof(int); | |
1874 | val = po->origdev; | |
1875 | ||
8dc41944 | 1876 | data = &val; |
1da177e4 | 1877 | break; |
bbd6ef87 PM |
1878 | #ifdef CONFIG_PACKET_MMAP |
1879 | case PACKET_VERSION: | |
1880 | if (len > sizeof(int)) | |
1881 | len = sizeof(int); | |
1882 | val = po->tp_version; | |
1883 | data = &val; | |
1884 | break; | |
1885 | case PACKET_HDRLEN: | |
1886 | if (len > sizeof(int)) | |
1887 | len = sizeof(int); | |
1888 | if (copy_from_user(&val, optval, len)) | |
1889 | return -EFAULT; | |
1890 | switch (val) { | |
1891 | case TPACKET_V1: | |
1892 | val = sizeof(struct tpacket_hdr); | |
1893 | break; | |
1894 | case TPACKET_V2: | |
1895 | val = sizeof(struct tpacket2_hdr); | |
1896 | break; | |
1897 | default: | |
1898 | return -EINVAL; | |
1899 | } | |
1900 | data = &val; | |
1901 | break; | |
8913336a PM |
1902 | case PACKET_RESERVE: |
1903 | if (len > sizeof(unsigned int)) | |
1904 | len = sizeof(unsigned int); | |
1905 | val = po->tp_reserve; | |
1906 | data = &val; | |
1907 | break; | |
69e3c75f JB |
1908 | case PACKET_LOSS: |
1909 | if (len > sizeof(unsigned int)) | |
1910 | len = sizeof(unsigned int); | |
1911 | val = po->tp_loss; | |
1912 | data = &val; | |
1913 | break; | |
bbd6ef87 | 1914 | #endif |
1da177e4 LT |
1915 | default: |
1916 | return -ENOPROTOOPT; | |
1917 | } | |
1918 | ||
8ae55f04 KK |
1919 | if (put_user(len, optlen)) |
1920 | return -EFAULT; | |
8dc41944 HX |
1921 | if (copy_to_user(optval, data, len)) |
1922 | return -EFAULT; | |
8ae55f04 | 1923 | return 0; |
1da177e4 LT |
1924 | } |
1925 | ||
1926 | ||
1927 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) | |
1928 | { | |
1929 | struct sock *sk; | |
1930 | struct hlist_node *node; | |
ad930650 | 1931 | struct net_device *dev = data; |
c346dca1 | 1932 | struct net *net = dev_net(dev); |
1da177e4 | 1933 | |
2aaef4e4 DL |
1934 | read_lock(&net->packet.sklist_lock); |
1935 | sk_for_each(sk, node, &net->packet.sklist) { | |
1da177e4 LT |
1936 | struct packet_sock *po = pkt_sk(sk); |
1937 | ||
1938 | switch (msg) { | |
1939 | case NETDEV_UNREGISTER: | |
1da177e4 LT |
1940 | if (po->mclist) |
1941 | packet_dev_mclist(dev, po->mclist, -1); | |
a2efcfa0 DM |
1942 | /* fallthrough */ |
1943 | ||
1da177e4 LT |
1944 | case NETDEV_DOWN: |
1945 | if (dev->ifindex == po->ifindex) { | |
1946 | spin_lock(&po->bind_lock); | |
1947 | if (po->running) { | |
1948 | __dev_remove_pack(&po->prot_hook); | |
1949 | __sock_put(sk); | |
1950 | po->running = 0; | |
1951 | sk->sk_err = ENETDOWN; | |
1952 | if (!sock_flag(sk, SOCK_DEAD)) | |
1953 | sk->sk_error_report(sk); | |
1954 | } | |
1955 | if (msg == NETDEV_UNREGISTER) { | |
1956 | po->ifindex = -1; | |
1957 | po->prot_hook.dev = NULL; | |
1958 | } | |
1959 | spin_unlock(&po->bind_lock); | |
1960 | } | |
1961 | break; | |
1962 | case NETDEV_UP: | |
1963 | spin_lock(&po->bind_lock); | |
1964 | if (dev->ifindex == po->ifindex && po->num && | |
1965 | !po->running) { | |
1966 | dev_add_pack(&po->prot_hook); | |
1967 | sock_hold(sk); | |
1968 | po->running = 1; | |
1969 | } | |
1970 | spin_unlock(&po->bind_lock); | |
1971 | break; | |
1972 | } | |
1973 | } | |
2aaef4e4 | 1974 | read_unlock(&net->packet.sklist_lock); |
1da177e4 LT |
1975 | return NOTIFY_DONE; |
1976 | } | |
1977 | ||
1978 | ||
1979 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
1980 | unsigned long arg) | |
1981 | { | |
1982 | struct sock *sk = sock->sk; | |
1983 | ||
69e3c75f | 1984 | switch (cmd) { |
40d4e3df ED |
1985 | case SIOCOUTQ: |
1986 | { | |
1987 | int amount = sk_wmem_alloc_get(sk); | |
31e6d363 | 1988 | |
40d4e3df ED |
1989 | return put_user(amount, (int __user *)arg); |
1990 | } | |
1991 | case SIOCINQ: | |
1992 | { | |
1993 | struct sk_buff *skb; | |
1994 | int amount = 0; | |
1995 | ||
1996 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1997 | skb = skb_peek(&sk->sk_receive_queue); | |
1998 | if (skb) | |
1999 | amount = skb->len; | |
2000 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
2001 | return put_user(amount, (int __user *)arg); | |
2002 | } | |
2003 | case SIOCGSTAMP: | |
2004 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
2005 | case SIOCGSTAMPNS: | |
2006 | return sock_get_timestampns(sk, (struct timespec __user *)arg); | |
1ce4f28b | 2007 | |
1da177e4 | 2008 | #ifdef CONFIG_INET |
40d4e3df ED |
2009 | case SIOCADDRT: |
2010 | case SIOCDELRT: | |
2011 | case SIOCDARP: | |
2012 | case SIOCGARP: | |
2013 | case SIOCSARP: | |
2014 | case SIOCGIFADDR: | |
2015 | case SIOCSIFADDR: | |
2016 | case SIOCGIFBRDADDR: | |
2017 | case SIOCSIFBRDADDR: | |
2018 | case SIOCGIFNETMASK: | |
2019 | case SIOCSIFNETMASK: | |
2020 | case SIOCGIFDSTADDR: | |
2021 | case SIOCSIFDSTADDR: | |
2022 | case SIOCSIFFLAGS: | |
2023 | if (!net_eq(sock_net(sk), &init_net)) | |
2024 | return -ENOIOCTLCMD; | |
2025 | return inet_dgram_ops.ioctl(sock, cmd, arg); | |
1da177e4 LT |
2026 | #endif |
2027 | ||
40d4e3df ED |
2028 | default: |
2029 | return -ENOIOCTLCMD; | |
1da177e4 LT |
2030 | } |
2031 | return 0; | |
2032 | } | |
2033 | ||
2034 | #ifndef CONFIG_PACKET_MMAP | |
2035 | #define packet_mmap sock_no_mmap | |
2036 | #define packet_poll datagram_poll | |
2037 | #else | |
2038 | ||
40d4e3df | 2039 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
1da177e4 LT |
2040 | poll_table *wait) |
2041 | { | |
2042 | struct sock *sk = sock->sk; | |
2043 | struct packet_sock *po = pkt_sk(sk); | |
2044 | unsigned int mask = datagram_poll(file, sock, wait); | |
2045 | ||
2046 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2047 | if (po->rx_ring.pg_vec) { |
2048 | if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL)) | |
1da177e4 LT |
2049 | mask |= POLLIN | POLLRDNORM; |
2050 | } | |
2051 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2052 | spin_lock_bh(&sk->sk_write_queue.lock); |
2053 | if (po->tx_ring.pg_vec) { | |
2054 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) | |
2055 | mask |= POLLOUT | POLLWRNORM; | |
2056 | } | |
2057 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
1da177e4 LT |
2058 | return mask; |
2059 | } | |
2060 | ||
2061 | ||
2062 | /* Dirty? Well, I still did not learn better way to account | |
2063 | * for user mmaps. | |
2064 | */ | |
2065 | ||
2066 | static void packet_mm_open(struct vm_area_struct *vma) | |
2067 | { | |
2068 | struct file *file = vma->vm_file; | |
40d4e3df | 2069 | struct socket *sock = file->private_data; |
1da177e4 | 2070 | struct sock *sk = sock->sk; |
1ce4f28b | 2071 | |
1da177e4 LT |
2072 | if (sk) |
2073 | atomic_inc(&pkt_sk(sk)->mapped); | |
2074 | } | |
2075 | ||
2076 | static void packet_mm_close(struct vm_area_struct *vma) | |
2077 | { | |
2078 | struct file *file = vma->vm_file; | |
40d4e3df | 2079 | struct socket *sock = file->private_data; |
1da177e4 | 2080 | struct sock *sk = sock->sk; |
1ce4f28b | 2081 | |
1da177e4 LT |
2082 | if (sk) |
2083 | atomic_dec(&pkt_sk(sk)->mapped); | |
2084 | } | |
2085 | ||
f0f37e2f | 2086 | static const struct vm_operations_struct packet_mmap_ops = { |
40d4e3df ED |
2087 | .open = packet_mm_open, |
2088 | .close = packet_mm_close, | |
1da177e4 LT |
2089 | }; |
2090 | ||
4ebf0ae2 | 2091 | static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len) |
1da177e4 LT |
2092 | { |
2093 | int i; | |
2094 | ||
4ebf0ae2 DM |
2095 | for (i = 0; i < len; i++) { |
2096 | if (likely(pg_vec[i])) | |
2097 | free_pages((unsigned long) pg_vec[i], order); | |
1da177e4 LT |
2098 | } |
2099 | kfree(pg_vec); | |
2100 | } | |
2101 | ||
4ebf0ae2 DM |
2102 | static inline char *alloc_one_pg_vec_page(unsigned long order) |
2103 | { | |
719bfeaa ED |
2104 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN; |
2105 | ||
2106 | return (char *) __get_free_pages(gfp_flags, order); | |
4ebf0ae2 DM |
2107 | } |
2108 | ||
2109 | static char **alloc_pg_vec(struct tpacket_req *req, int order) | |
2110 | { | |
2111 | unsigned int block_nr = req->tp_block_nr; | |
2112 | char **pg_vec; | |
2113 | int i; | |
2114 | ||
2115 | pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL); | |
2116 | if (unlikely(!pg_vec)) | |
2117 | goto out; | |
2118 | ||
2119 | for (i = 0; i < block_nr; i++) { | |
2120 | pg_vec[i] = alloc_one_pg_vec_page(order); | |
2121 | if (unlikely(!pg_vec[i])) | |
2122 | goto out_free_pgvec; | |
2123 | } | |
2124 | ||
2125 | out: | |
2126 | return pg_vec; | |
2127 | ||
2128 | out_free_pgvec: | |
2129 | free_pg_vec(pg_vec, order, block_nr); | |
2130 | pg_vec = NULL; | |
2131 | goto out; | |
2132 | } | |
1da177e4 | 2133 | |
69e3c75f JB |
2134 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
2135 | int closing, int tx_ring) | |
1da177e4 LT |
2136 | { |
2137 | char **pg_vec = NULL; | |
2138 | struct packet_sock *po = pkt_sk(sk); | |
0e11c91e | 2139 | int was_running, order = 0; |
69e3c75f JB |
2140 | struct packet_ring_buffer *rb; |
2141 | struct sk_buff_head *rb_queue; | |
0e11c91e | 2142 | __be16 num; |
69e3c75f | 2143 | int err; |
1ce4f28b | 2144 | |
69e3c75f JB |
2145 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
2146 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; | |
1da177e4 | 2147 | |
69e3c75f JB |
2148 | err = -EBUSY; |
2149 | if (!closing) { | |
2150 | if (atomic_read(&po->mapped)) | |
2151 | goto out; | |
2152 | if (atomic_read(&rb->pending)) | |
2153 | goto out; | |
2154 | } | |
1da177e4 | 2155 | |
69e3c75f JB |
2156 | if (req->tp_block_nr) { |
2157 | /* Sanity tests and some calculations */ | |
2158 | err = -EBUSY; | |
2159 | if (unlikely(rb->pg_vec)) | |
2160 | goto out; | |
1da177e4 | 2161 | |
bbd6ef87 PM |
2162 | switch (po->tp_version) { |
2163 | case TPACKET_V1: | |
2164 | po->tp_hdrlen = TPACKET_HDRLEN; | |
2165 | break; | |
2166 | case TPACKET_V2: | |
2167 | po->tp_hdrlen = TPACKET2_HDRLEN; | |
2168 | break; | |
2169 | } | |
2170 | ||
69e3c75f | 2171 | err = -EINVAL; |
4ebf0ae2 | 2172 | if (unlikely((int)req->tp_block_size <= 0)) |
69e3c75f | 2173 | goto out; |
4ebf0ae2 | 2174 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
69e3c75f | 2175 | goto out; |
8913336a | 2176 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
69e3c75f JB |
2177 | po->tp_reserve)) |
2178 | goto out; | |
4ebf0ae2 | 2179 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
69e3c75f | 2180 | goto out; |
1da177e4 | 2181 | |
69e3c75f JB |
2182 | rb->frames_per_block = req->tp_block_size/req->tp_frame_size; |
2183 | if (unlikely(rb->frames_per_block <= 0)) | |
2184 | goto out; | |
2185 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != | |
2186 | req->tp_frame_nr)) | |
2187 | goto out; | |
1da177e4 LT |
2188 | |
2189 | err = -ENOMEM; | |
4ebf0ae2 DM |
2190 | order = get_order(req->tp_block_size); |
2191 | pg_vec = alloc_pg_vec(req, order); | |
2192 | if (unlikely(!pg_vec)) | |
1da177e4 | 2193 | goto out; |
69e3c75f JB |
2194 | } |
2195 | /* Done */ | |
2196 | else { | |
2197 | err = -EINVAL; | |
4ebf0ae2 | 2198 | if (unlikely(req->tp_frame_nr)) |
69e3c75f | 2199 | goto out; |
1da177e4 LT |
2200 | } |
2201 | ||
2202 | lock_sock(sk); | |
2203 | ||
2204 | /* Detach socket from network */ | |
2205 | spin_lock(&po->bind_lock); | |
2206 | was_running = po->running; | |
2207 | num = po->num; | |
2208 | if (was_running) { | |
2209 | __dev_remove_pack(&po->prot_hook); | |
2210 | po->num = 0; | |
2211 | po->running = 0; | |
2212 | __sock_put(sk); | |
2213 | } | |
2214 | spin_unlock(&po->bind_lock); | |
1ce4f28b | 2215 | |
1da177e4 LT |
2216 | synchronize_net(); |
2217 | ||
2218 | err = -EBUSY; | |
905db440 | 2219 | mutex_lock(&po->pg_vec_lock); |
1da177e4 LT |
2220 | if (closing || atomic_read(&po->mapped) == 0) { |
2221 | err = 0; | |
2222 | #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) | |
69e3c75f JB |
2223 | spin_lock_bh(&rb_queue->lock); |
2224 | pg_vec = XC(rb->pg_vec, pg_vec); | |
2225 | rb->frame_max = (req->tp_frame_nr - 1); | |
2226 | rb->head = 0; | |
2227 | rb->frame_size = req->tp_frame_size; | |
2228 | spin_unlock_bh(&rb_queue->lock); | |
2229 | ||
2230 | order = XC(rb->pg_vec_order, order); | |
2231 | req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr); | |
2232 | ||
2233 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
2234 | po->prot_hook.func = (po->rx_ring.pg_vec) ? | |
2235 | tpacket_rcv : packet_rcv; | |
2236 | skb_queue_purge(rb_queue); | |
1da177e4 LT |
2237 | #undef XC |
2238 | if (atomic_read(&po->mapped)) | |
40d4e3df ED |
2239 | pr_err("packet_mmap: vma is busy: %d\n", |
2240 | atomic_read(&po->mapped)); | |
1da177e4 | 2241 | } |
905db440 | 2242 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2243 | |
2244 | spin_lock(&po->bind_lock); | |
2245 | if (was_running && !po->running) { | |
2246 | sock_hold(sk); | |
2247 | po->running = 1; | |
2248 | po->num = num; | |
2249 | dev_add_pack(&po->prot_hook); | |
2250 | } | |
2251 | spin_unlock(&po->bind_lock); | |
2252 | ||
2253 | release_sock(sk); | |
2254 | ||
1da177e4 LT |
2255 | if (pg_vec) |
2256 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
2257 | out: | |
2258 | return err; | |
2259 | } | |
2260 | ||
69e3c75f JB |
2261 | static int packet_mmap(struct file *file, struct socket *sock, |
2262 | struct vm_area_struct *vma) | |
1da177e4 LT |
2263 | { |
2264 | struct sock *sk = sock->sk; | |
2265 | struct packet_sock *po = pkt_sk(sk); | |
69e3c75f JB |
2266 | unsigned long size, expected_size; |
2267 | struct packet_ring_buffer *rb; | |
1da177e4 LT |
2268 | unsigned long start; |
2269 | int err = -EINVAL; | |
2270 | int i; | |
2271 | ||
2272 | if (vma->vm_pgoff) | |
2273 | return -EINVAL; | |
2274 | ||
905db440 | 2275 | mutex_lock(&po->pg_vec_lock); |
69e3c75f JB |
2276 | |
2277 | expected_size = 0; | |
2278 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { | |
2279 | if (rb->pg_vec) { | |
2280 | expected_size += rb->pg_vec_len | |
2281 | * rb->pg_vec_pages | |
2282 | * PAGE_SIZE; | |
2283 | } | |
2284 | } | |
2285 | ||
2286 | if (expected_size == 0) | |
1da177e4 | 2287 | goto out; |
69e3c75f JB |
2288 | |
2289 | size = vma->vm_end - vma->vm_start; | |
2290 | if (size != expected_size) | |
1da177e4 LT |
2291 | goto out; |
2292 | ||
1da177e4 | 2293 | start = vma->vm_start; |
69e3c75f JB |
2294 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
2295 | if (rb->pg_vec == NULL) | |
2296 | continue; | |
2297 | ||
2298 | for (i = 0; i < rb->pg_vec_len; i++) { | |
2299 | struct page *page = virt_to_page(rb->pg_vec[i]); | |
2300 | int pg_num; | |
2301 | ||
2302 | for (pg_num = 0; pg_num < rb->pg_vec_pages; | |
40d4e3df | 2303 | pg_num++, page++) { |
69e3c75f JB |
2304 | err = vm_insert_page(vma, start, page); |
2305 | if (unlikely(err)) | |
2306 | goto out; | |
2307 | start += PAGE_SIZE; | |
2308 | } | |
4ebf0ae2 | 2309 | } |
1da177e4 | 2310 | } |
69e3c75f | 2311 | |
4ebf0ae2 | 2312 | atomic_inc(&po->mapped); |
1da177e4 LT |
2313 | vma->vm_ops = &packet_mmap_ops; |
2314 | err = 0; | |
2315 | ||
2316 | out: | |
905db440 | 2317 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2318 | return err; |
2319 | } | |
2320 | #endif | |
2321 | ||
2322 | ||
90ddc4f0 | 2323 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
2324 | .family = PF_PACKET, |
2325 | .owner = THIS_MODULE, | |
2326 | .release = packet_release, | |
2327 | .bind = packet_bind_spkt, | |
2328 | .connect = sock_no_connect, | |
2329 | .socketpair = sock_no_socketpair, | |
2330 | .accept = sock_no_accept, | |
2331 | .getname = packet_getname_spkt, | |
2332 | .poll = datagram_poll, | |
2333 | .ioctl = packet_ioctl, | |
2334 | .listen = sock_no_listen, | |
2335 | .shutdown = sock_no_shutdown, | |
2336 | .setsockopt = sock_no_setsockopt, | |
2337 | .getsockopt = sock_no_getsockopt, | |
2338 | .sendmsg = packet_sendmsg_spkt, | |
2339 | .recvmsg = packet_recvmsg, | |
2340 | .mmap = sock_no_mmap, | |
2341 | .sendpage = sock_no_sendpage, | |
2342 | }; | |
1da177e4 | 2343 | |
90ddc4f0 | 2344 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
2345 | .family = PF_PACKET, |
2346 | .owner = THIS_MODULE, | |
2347 | .release = packet_release, | |
2348 | .bind = packet_bind, | |
2349 | .connect = sock_no_connect, | |
2350 | .socketpair = sock_no_socketpair, | |
2351 | .accept = sock_no_accept, | |
1ce4f28b | 2352 | .getname = packet_getname, |
1da177e4 LT |
2353 | .poll = packet_poll, |
2354 | .ioctl = packet_ioctl, | |
2355 | .listen = sock_no_listen, | |
2356 | .shutdown = sock_no_shutdown, | |
2357 | .setsockopt = packet_setsockopt, | |
2358 | .getsockopt = packet_getsockopt, | |
2359 | .sendmsg = packet_sendmsg, | |
2360 | .recvmsg = packet_recvmsg, | |
2361 | .mmap = packet_mmap, | |
2362 | .sendpage = sock_no_sendpage, | |
2363 | }; | |
2364 | ||
ec1b4cf7 | 2365 | static const struct net_proto_family packet_family_ops = { |
1da177e4 LT |
2366 | .family = PF_PACKET, |
2367 | .create = packet_create, | |
2368 | .owner = THIS_MODULE, | |
2369 | }; | |
2370 | ||
2371 | static struct notifier_block packet_netdev_notifier = { | |
40d4e3df | 2372 | .notifier_call = packet_notifier, |
1da177e4 LT |
2373 | }; |
2374 | ||
2375 | #ifdef CONFIG_PROC_FS | |
d12d01d6 | 2376 | static inline struct sock *packet_seq_idx(struct net *net, loff_t off) |
1da177e4 LT |
2377 | { |
2378 | struct sock *s; | |
2379 | struct hlist_node *node; | |
2380 | ||
2aaef4e4 | 2381 | sk_for_each(s, node, &net->packet.sklist) { |
1da177e4 LT |
2382 | if (!off--) |
2383 | return s; | |
2384 | } | |
2385 | return NULL; | |
2386 | } | |
2387 | ||
2388 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
40ccbf52 | 2389 | __acquires(seq_file_net(seq)->packet.sklist_lock) |
1da177e4 | 2390 | { |
e372c414 | 2391 | struct net *net = seq_file_net(seq); |
2aaef4e4 | 2392 | read_lock(&net->packet.sklist_lock); |
d12d01d6 | 2393 | return *pos ? packet_seq_idx(net, *pos - 1) : SEQ_START_TOKEN; |
1da177e4 LT |
2394 | } |
2395 | ||
2396 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2397 | { | |
1bf40954 | 2398 | struct net *net = seq_file_net(seq); |
1da177e4 | 2399 | ++*pos; |
1ce4f28b | 2400 | return (v == SEQ_START_TOKEN) |
2aaef4e4 | 2401 | ? sk_head(&net->packet.sklist) |
40d4e3df | 2402 | : sk_next((struct sock *)v) ; |
1da177e4 LT |
2403 | } |
2404 | ||
2405 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
40ccbf52 | 2406 | __releases(seq_file_net(seq)->packet.sklist_lock) |
1da177e4 | 2407 | { |
1bf40954 | 2408 | struct net *net = seq_file_net(seq); |
2aaef4e4 | 2409 | read_unlock(&net->packet.sklist_lock); |
1da177e4 LT |
2410 | } |
2411 | ||
1ce4f28b | 2412 | static int packet_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
2413 | { |
2414 | if (v == SEQ_START_TOKEN) | |
2415 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
2416 | else { | |
2417 | struct sock *s = v; | |
2418 | const struct packet_sock *po = pkt_sk(s); | |
2419 | ||
2420 | seq_printf(seq, | |
2421 | "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", | |
2422 | s, | |
2423 | atomic_read(&s->sk_refcnt), | |
2424 | s->sk_type, | |
2425 | ntohs(po->num), | |
2426 | po->ifindex, | |
2427 | po->running, | |
2428 | atomic_read(&s->sk_rmem_alloc), | |
2429 | sock_i_uid(s), | |
40d4e3df | 2430 | sock_i_ino(s)); |
1da177e4 LT |
2431 | } |
2432 | ||
2433 | return 0; | |
2434 | } | |
2435 | ||
56b3d975 | 2436 | static const struct seq_operations packet_seq_ops = { |
1da177e4 LT |
2437 | .start = packet_seq_start, |
2438 | .next = packet_seq_next, | |
2439 | .stop = packet_seq_stop, | |
2440 | .show = packet_seq_show, | |
2441 | }; | |
2442 | ||
2443 | static int packet_seq_open(struct inode *inode, struct file *file) | |
2444 | { | |
e372c414 DL |
2445 | return seq_open_net(inode, file, &packet_seq_ops, |
2446 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2447 | } |
2448 | ||
da7071d7 | 2449 | static const struct file_operations packet_seq_fops = { |
1da177e4 LT |
2450 | .owner = THIS_MODULE, |
2451 | .open = packet_seq_open, | |
2452 | .read = seq_read, | |
2453 | .llseek = seq_lseek, | |
e372c414 | 2454 | .release = seq_release_net, |
1da177e4 LT |
2455 | }; |
2456 | ||
2457 | #endif | |
2458 | ||
d12d01d6 DL |
2459 | static int packet_net_init(struct net *net) |
2460 | { | |
2aaef4e4 DL |
2461 | rwlock_init(&net->packet.sklist_lock); |
2462 | INIT_HLIST_HEAD(&net->packet.sklist); | |
d12d01d6 DL |
2463 | |
2464 | if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops)) | |
2465 | return -ENOMEM; | |
2466 | ||
2467 | return 0; | |
2468 | } | |
2469 | ||
2470 | static void packet_net_exit(struct net *net) | |
2471 | { | |
2472 | proc_net_remove(net, "packet"); | |
2473 | } | |
2474 | ||
2475 | static struct pernet_operations packet_net_ops = { | |
2476 | .init = packet_net_init, | |
2477 | .exit = packet_net_exit, | |
2478 | }; | |
2479 | ||
2480 | ||
1da177e4 LT |
2481 | static void __exit packet_exit(void) |
2482 | { | |
1da177e4 | 2483 | unregister_netdevice_notifier(&packet_netdev_notifier); |
d12d01d6 | 2484 | unregister_pernet_subsys(&packet_net_ops); |
1da177e4 LT |
2485 | sock_unregister(PF_PACKET); |
2486 | proto_unregister(&packet_proto); | |
2487 | } | |
2488 | ||
2489 | static int __init packet_init(void) | |
2490 | { | |
2491 | int rc = proto_register(&packet_proto, 0); | |
2492 | ||
2493 | if (rc != 0) | |
2494 | goto out; | |
2495 | ||
2496 | sock_register(&packet_family_ops); | |
d12d01d6 | 2497 | register_pernet_subsys(&packet_net_ops); |
1da177e4 | 2498 | register_netdevice_notifier(&packet_netdev_notifier); |
1da177e4 LT |
2499 | out: |
2500 | return rc; | |
2501 | } | |
2502 | ||
2503 | module_init(packet_init); | |
2504 | module_exit(packet_exit); | |
2505 | MODULE_LICENSE("GPL"); | |
2506 | MODULE_ALIAS_NETPROTO(PF_PACKET); |