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 | * | |
8 | * Version: $Id: af_packet.c,v 1.61 2002/02/08 03:57:19 davem Exp $ | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
13 | * | |
14 | * Fixes: | |
15 | * Alan Cox : verify_area() now used correctly | |
16 | * Alan Cox : new skbuff lists, look ma no backlogs! | |
17 | * Alan Cox : tidied skbuff lists. | |
18 | * Alan Cox : Now uses generic datagram routines I | |
19 | * added. Also fixed the peek/read crash | |
20 | * from all old Linux datagram code. | |
21 | * Alan Cox : Uses the improved datagram code. | |
22 | * Alan Cox : Added NULL's for socket options. | |
23 | * Alan Cox : Re-commented the code. | |
24 | * Alan Cox : Use new kernel side addressing | |
25 | * Rob Janssen : Correct MTU usage. | |
26 | * Dave Platt : Counter leaks caused by incorrect | |
27 | * interrupt locking and some slightly | |
28 | * dubious gcc output. Can you read | |
29 | * compiler: it said _VOLATILE_ | |
30 | * Richard Kooijman : Timestamp fixes. | |
31 | * Alan Cox : New buffers. Use sk->mac.raw. | |
32 | * Alan Cox : sendmsg/recvmsg support. | |
33 | * Alan Cox : Protocol setting support | |
34 | * Alexey Kuznetsov : Untied from IPv4 stack. | |
35 | * Cyrus Durgin : Fixed kerneld for kmod. | |
36 | * Michal Ostrowski : Module initialization cleanup. | |
37 | * Ulises Alonso : Frame number limit removal and | |
38 | * packet_set_ring memory leak. | |
0fb375fb EB |
39 | * Eric Biederman : Allow for > 8 byte hardware addresses. |
40 | * The convention is that longer addresses | |
41 | * will simply extend the hardware address | |
42 | * byte arrays at the end of sockaddr_ll | |
43 | * and packet_mreq. | |
1da177e4 LT |
44 | * |
45 | * This program is free software; you can redistribute it and/or | |
46 | * modify it under the terms of the GNU General Public License | |
47 | * as published by the Free Software Foundation; either version | |
48 | * 2 of the License, or (at your option) any later version. | |
49 | * | |
50 | */ | |
51 | ||
52 | #include <linux/config.h> | |
53 | #include <linux/types.h> | |
54 | #include <linux/sched.h> | |
55 | #include <linux/mm.h> | |
4fc268d2 | 56 | #include <linux/capability.h> |
1da177e4 LT |
57 | #include <linux/fcntl.h> |
58 | #include <linux/socket.h> | |
59 | #include <linux/in.h> | |
60 | #include <linux/inet.h> | |
61 | #include <linux/netdevice.h> | |
62 | #include <linux/if_packet.h> | |
63 | #include <linux/wireless.h> | |
64 | #include <linux/kmod.h> | |
65 | #include <net/ip.h> | |
66 | #include <net/protocol.h> | |
67 | #include <linux/skbuff.h> | |
68 | #include <net/sock.h> | |
69 | #include <linux/errno.h> | |
70 | #include <linux/timer.h> | |
71 | #include <asm/system.h> | |
72 | #include <asm/uaccess.h> | |
73 | #include <asm/ioctls.h> | |
74 | #include <asm/page.h> | |
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> | |
81 | ||
82 | #ifdef CONFIG_INET | |
83 | #include <net/inet_common.h> | |
84 | #endif | |
85 | ||
86 | #define CONFIG_SOCK_PACKET 1 | |
87 | ||
88 | /* | |
89 | Proposed replacement for SIOC{ADD,DEL}MULTI and | |
90 | IFF_PROMISC, IFF_ALLMULTI flags. | |
91 | ||
92 | It is more expensive, but I believe, | |
93 | it is really correct solution: reentereble, safe and fault tolerant. | |
94 | ||
95 | IFF_PROMISC/IFF_ALLMULTI/SIOC{ADD/DEL}MULTI are faked by keeping | |
96 | reference count and global flag, so that real status is | |
97 | (gflag|(count != 0)), so that we can use obsolete faulty interface | |
98 | not harming clever users. | |
99 | */ | |
100 | #define CONFIG_PACKET_MULTICAST 1 | |
101 | ||
102 | /* | |
103 | Assumptions: | |
104 | - if device has no dev->hard_header routine, it adds and removes ll header | |
105 | inside itself. In this case ll header is invisible outside of device, | |
106 | but higher levels still should reserve dev->hard_header_len. | |
107 | Some devices are enough clever to reallocate skb, when header | |
108 | will not fit to reserved space (tunnel), another ones are silly | |
109 | (PPP). | |
110 | - packet socket receives packets with pulled ll header, | |
111 | so that SOCK_RAW should push it back. | |
112 | ||
113 | On receive: | |
114 | ----------- | |
115 | ||
116 | Incoming, dev->hard_header!=NULL | |
117 | mac.raw -> ll header | |
118 | data -> data | |
119 | ||
120 | Outgoing, dev->hard_header!=NULL | |
121 | mac.raw -> ll header | |
122 | data -> ll header | |
123 | ||
124 | Incoming, dev->hard_header==NULL | |
125 | mac.raw -> UNKNOWN position. It is very likely, that it points to ll header. | |
126 | PPP makes it, that is wrong, because introduce assymetry | |
127 | between rx and tx paths. | |
128 | data -> data | |
129 | ||
130 | Outgoing, dev->hard_header==NULL | |
131 | mac.raw -> data. ll header is still not built! | |
132 | data -> data | |
133 | ||
134 | Resume | |
135 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. | |
136 | ||
137 | ||
138 | On transmit: | |
139 | ------------ | |
140 | ||
141 | dev->hard_header != NULL | |
142 | mac.raw -> ll header | |
143 | data -> ll header | |
144 | ||
145 | dev->hard_header == NULL (ll header is added by device, we cannot control it) | |
146 | mac.raw -> data | |
147 | data -> data | |
148 | ||
149 | We should set nh.raw on output to correct posistion, | |
150 | packet classifier depends on it. | |
151 | */ | |
152 | ||
153 | /* List of all packet sockets. */ | |
154 | static HLIST_HEAD(packet_sklist); | |
155 | static DEFINE_RWLOCK(packet_sklist_lock); | |
156 | ||
157 | static atomic_t packet_socks_nr; | |
158 | ||
159 | ||
160 | /* Private packet socket structures. */ | |
161 | ||
162 | #ifdef CONFIG_PACKET_MULTICAST | |
163 | struct packet_mclist | |
164 | { | |
165 | struct packet_mclist *next; | |
166 | int ifindex; | |
167 | int count; | |
168 | unsigned short type; | |
169 | unsigned short alen; | |
0fb375fb EB |
170 | unsigned char addr[MAX_ADDR_LEN]; |
171 | }; | |
172 | /* identical to struct packet_mreq except it has | |
173 | * a longer address field. | |
174 | */ | |
175 | struct packet_mreq_max | |
176 | { | |
177 | int mr_ifindex; | |
178 | unsigned short mr_type; | |
179 | unsigned short mr_alen; | |
180 | unsigned char mr_address[MAX_ADDR_LEN]; | |
1da177e4 LT |
181 | }; |
182 | #endif | |
183 | #ifdef CONFIG_PACKET_MMAP | |
184 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing); | |
185 | #endif | |
186 | ||
187 | static void packet_flush_mclist(struct sock *sk); | |
188 | ||
189 | struct packet_sock { | |
190 | /* struct sock has to be the first member of packet_sock */ | |
191 | struct sock sk; | |
192 | struct tpacket_stats stats; | |
193 | #ifdef CONFIG_PACKET_MMAP | |
194 | char * *pg_vec; | |
195 | unsigned int head; | |
196 | unsigned int frames_per_block; | |
197 | unsigned int frame_size; | |
198 | unsigned int frame_max; | |
199 | int copy_thresh; | |
200 | #endif | |
201 | struct packet_type prot_hook; | |
202 | spinlock_t bind_lock; | |
203 | char running; /* prot_hook is attached*/ | |
204 | int ifindex; /* bound device */ | |
205 | unsigned short num; | |
206 | #ifdef CONFIG_PACKET_MULTICAST | |
207 | struct packet_mclist *mclist; | |
208 | #endif | |
209 | #ifdef CONFIG_PACKET_MMAP | |
210 | atomic_t mapped; | |
211 | unsigned int pg_vec_order; | |
212 | unsigned int pg_vec_pages; | |
213 | unsigned int pg_vec_len; | |
214 | #endif | |
215 | }; | |
216 | ||
217 | #ifdef CONFIG_PACKET_MMAP | |
218 | ||
219 | static inline char *packet_lookup_frame(struct packet_sock *po, unsigned int position) | |
220 | { | |
221 | unsigned int pg_vec_pos, frame_offset; | |
222 | char *frame; | |
223 | ||
224 | pg_vec_pos = position / po->frames_per_block; | |
225 | frame_offset = position % po->frames_per_block; | |
226 | ||
227 | frame = po->pg_vec[pg_vec_pos] + (frame_offset * po->frame_size); | |
228 | ||
229 | return frame; | |
230 | } | |
231 | #endif | |
232 | ||
233 | static inline struct packet_sock *pkt_sk(struct sock *sk) | |
234 | { | |
235 | return (struct packet_sock *)sk; | |
236 | } | |
237 | ||
238 | static void packet_sock_destruct(struct sock *sk) | |
239 | { | |
240 | BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); | |
241 | BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); | |
242 | ||
243 | if (!sock_flag(sk, SOCK_DEAD)) { | |
244 | printk("Attempt to release alive packet socket: %p\n", sk); | |
245 | return; | |
246 | } | |
247 | ||
248 | atomic_dec(&packet_socks_nr); | |
249 | #ifdef PACKET_REFCNT_DEBUG | |
250 | printk(KERN_DEBUG "PACKET socket %p is free, %d are alive\n", sk, atomic_read(&packet_socks_nr)); | |
251 | #endif | |
252 | } | |
253 | ||
254 | ||
90ddc4f0 | 255 | static const struct proto_ops packet_ops; |
1da177e4 LT |
256 | |
257 | #ifdef CONFIG_SOCK_PACKET | |
90ddc4f0 | 258 | static const struct proto_ops packet_ops_spkt; |
1da177e4 | 259 | |
f2ccd8fa | 260 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
261 | { |
262 | struct sock *sk; | |
263 | struct sockaddr_pkt *spkt; | |
264 | ||
265 | /* | |
266 | * When we registered the protocol we saved the socket in the data | |
267 | * field for just this event. | |
268 | */ | |
269 | ||
270 | sk = pt->af_packet_priv; | |
271 | ||
272 | /* | |
273 | * Yank back the headers [hope the device set this | |
274 | * right or kerboom...] | |
275 | * | |
276 | * Incoming packets have ll header pulled, | |
277 | * push it back. | |
278 | * | |
279 | * For outgoing ones skb->data == skb->mac.raw | |
280 | * so that this procedure is noop. | |
281 | */ | |
282 | ||
283 | if (skb->pkt_type == PACKET_LOOPBACK) | |
284 | goto out; | |
285 | ||
286 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
287 | goto oom; | |
288 | ||
289 | /* drop any routing info */ | |
290 | dst_release(skb->dst); | |
291 | skb->dst = NULL; | |
292 | ||
84531c24 PO |
293 | /* drop conntrack reference */ |
294 | nf_reset(skb); | |
295 | ||
1da177e4 LT |
296 | spkt = (struct sockaddr_pkt*)skb->cb; |
297 | ||
298 | skb_push(skb, skb->data-skb->mac.raw); | |
299 | ||
300 | /* | |
301 | * The SOCK_PACKET socket receives _all_ frames. | |
302 | */ | |
303 | ||
304 | spkt->spkt_family = dev->type; | |
305 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
306 | spkt->spkt_protocol = skb->protocol; | |
307 | ||
308 | /* | |
309 | * Charge the memory to the socket. This is done specifically | |
310 | * to prevent sockets using all the memory up. | |
311 | */ | |
312 | ||
313 | if (sock_queue_rcv_skb(sk,skb) == 0) | |
314 | return 0; | |
315 | ||
316 | out: | |
317 | kfree_skb(skb); | |
318 | oom: | |
319 | return 0; | |
320 | } | |
321 | ||
322 | ||
323 | /* | |
324 | * Output a raw packet to a device layer. This bypasses all the other | |
325 | * protocol layers and you must therefore supply it with a complete frame | |
326 | */ | |
327 | ||
328 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, | |
329 | struct msghdr *msg, size_t len) | |
330 | { | |
331 | struct sock *sk = sock->sk; | |
332 | struct sockaddr_pkt *saddr=(struct sockaddr_pkt *)msg->msg_name; | |
333 | struct sk_buff *skb; | |
334 | struct net_device *dev; | |
335 | unsigned short proto=0; | |
336 | int err; | |
337 | ||
338 | /* | |
339 | * Get and verify the address. | |
340 | */ | |
341 | ||
342 | if (saddr) | |
343 | { | |
344 | if (msg->msg_namelen < sizeof(struct sockaddr)) | |
345 | return(-EINVAL); | |
346 | if (msg->msg_namelen==sizeof(struct sockaddr_pkt)) | |
347 | proto=saddr->spkt_protocol; | |
348 | } | |
349 | else | |
350 | return(-ENOTCONN); /* SOCK_PACKET must be sent giving an address */ | |
351 | ||
352 | /* | |
353 | * Find the device first to size check it | |
354 | */ | |
355 | ||
356 | saddr->spkt_device[13] = 0; | |
357 | dev = dev_get_by_name(saddr->spkt_device); | |
358 | err = -ENODEV; | |
359 | if (dev == NULL) | |
360 | goto out_unlock; | |
361 | ||
362 | /* | |
363 | * You may not queue a frame bigger than the mtu. This is the lowest level | |
364 | * raw protocol and you must do your own fragmentation at this level. | |
365 | */ | |
366 | ||
367 | err = -EMSGSIZE; | |
368 | if(len>dev->mtu+dev->hard_header_len) | |
369 | goto out_unlock; | |
370 | ||
371 | err = -ENOBUFS; | |
372 | skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL); | |
373 | ||
374 | /* | |
375 | * If the write buffer is full, then tough. At this level the user gets to | |
376 | * deal with the problem - do your own algorithmic backoffs. That's far | |
377 | * more flexible. | |
378 | */ | |
379 | ||
380 | if (skb == NULL) | |
381 | goto out_unlock; | |
382 | ||
383 | /* | |
384 | * Fill it in | |
385 | */ | |
386 | ||
387 | /* FIXME: Save some space for broken drivers that write a | |
388 | * hard header at transmission time by themselves. PPP is the | |
389 | * notable one here. This should really be fixed at the driver level. | |
390 | */ | |
391 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
392 | skb->nh.raw = skb->data; | |
393 | ||
394 | /* Try to align data part correctly */ | |
395 | if (dev->hard_header) { | |
396 | skb->data -= dev->hard_header_len; | |
397 | skb->tail -= dev->hard_header_len; | |
398 | if (len < dev->hard_header_len) | |
399 | skb->nh.raw = skb->data; | |
400 | } | |
401 | ||
402 | /* Returns -EFAULT on error */ | |
403 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); | |
404 | skb->protocol = proto; | |
405 | skb->dev = dev; | |
406 | skb->priority = sk->sk_priority; | |
407 | if (err) | |
408 | goto out_free; | |
409 | ||
410 | err = -ENETDOWN; | |
411 | if (!(dev->flags & IFF_UP)) | |
412 | goto out_free; | |
413 | ||
414 | /* | |
415 | * Now send it | |
416 | */ | |
417 | ||
418 | dev_queue_xmit(skb); | |
419 | dev_put(dev); | |
420 | return(len); | |
421 | ||
422 | out_free: | |
423 | kfree_skb(skb); | |
424 | out_unlock: | |
425 | if (dev) | |
426 | dev_put(dev); | |
427 | return err; | |
428 | } | |
429 | #endif | |
430 | ||
431 | static inline unsigned run_filter(struct sk_buff *skb, struct sock *sk, unsigned res) | |
432 | { | |
433 | struct sk_filter *filter; | |
434 | ||
435 | bh_lock_sock(sk); | |
436 | filter = sk->sk_filter; | |
437 | /* | |
438 | * Our caller already checked that filter != NULL but we need to | |
439 | * verify that under bh_lock_sock() to be safe | |
440 | */ | |
441 | if (likely(filter != NULL)) | |
442 | res = sk_run_filter(skb, filter->insns, filter->len); | |
443 | bh_unlock_sock(sk); | |
444 | ||
445 | return res; | |
446 | } | |
447 | ||
448 | /* | |
449 | This function makes lazy skb cloning in hope that most of packets | |
450 | are discarded by BPF. | |
451 | ||
452 | Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
453 | and skb->cb are mangled. It works because (and until) packets | |
454 | falling here are owned by current CPU. Output packets are cloned | |
455 | by dev_queue_xmit_nit(), input packets are processed by net_bh | |
456 | sequencially, so that if we return skb to original state on exit, | |
457 | we will not harm anyone. | |
458 | */ | |
459 | ||
f2ccd8fa | 460 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
461 | { |
462 | struct sock *sk; | |
463 | struct sockaddr_ll *sll; | |
464 | struct packet_sock *po; | |
465 | u8 * skb_head = skb->data; | |
466 | int skb_len = skb->len; | |
467 | unsigned snaplen; | |
468 | ||
469 | if (skb->pkt_type == PACKET_LOOPBACK) | |
470 | goto drop; | |
471 | ||
472 | sk = pt->af_packet_priv; | |
473 | po = pkt_sk(sk); | |
474 | ||
475 | skb->dev = dev; | |
476 | ||
477 | if (dev->hard_header) { | |
478 | /* The device has an explicit notion of ll header, | |
479 | exported to higher levels. | |
480 | ||
481 | Otherwise, the device hides datails of it frame | |
482 | structure, so that corresponding packet head | |
483 | never delivered to user. | |
484 | */ | |
485 | if (sk->sk_type != SOCK_DGRAM) | |
486 | skb_push(skb, skb->data - skb->mac.raw); | |
487 | else if (skb->pkt_type == PACKET_OUTGOING) { | |
488 | /* Special case: outgoing packets have ll header at head */ | |
489 | skb_pull(skb, skb->nh.raw - skb->data); | |
490 | } | |
491 | } | |
492 | ||
493 | snaplen = skb->len; | |
494 | ||
495 | if (sk->sk_filter) { | |
496 | unsigned res = run_filter(skb, sk, snaplen); | |
497 | if (res == 0) | |
498 | goto drop_n_restore; | |
499 | if (snaplen > res) | |
500 | snaplen = res; | |
501 | } | |
502 | ||
503 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
504 | (unsigned)sk->sk_rcvbuf) | |
505 | goto drop_n_acct; | |
506 | ||
507 | if (skb_shared(skb)) { | |
508 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
509 | if (nskb == NULL) | |
510 | goto drop_n_acct; | |
511 | ||
512 | if (skb_head != skb->data) { | |
513 | skb->data = skb_head; | |
514 | skb->len = skb_len; | |
515 | } | |
516 | kfree_skb(skb); | |
517 | skb = nskb; | |
518 | } | |
519 | ||
520 | sll = (struct sockaddr_ll*)skb->cb; | |
521 | sll->sll_family = AF_PACKET; | |
522 | sll->sll_hatype = dev->type; | |
523 | sll->sll_protocol = skb->protocol; | |
524 | sll->sll_pkttype = skb->pkt_type; | |
525 | sll->sll_ifindex = dev->ifindex; | |
526 | sll->sll_halen = 0; | |
527 | ||
528 | if (dev->hard_header_parse) | |
529 | sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); | |
530 | ||
531 | if (pskb_trim(skb, snaplen)) | |
532 | goto drop_n_acct; | |
533 | ||
534 | skb_set_owner_r(skb, sk); | |
535 | skb->dev = NULL; | |
536 | dst_release(skb->dst); | |
537 | skb->dst = NULL; | |
538 | ||
84531c24 PO |
539 | /* drop conntrack reference */ |
540 | nf_reset(skb); | |
541 | ||
1da177e4 LT |
542 | spin_lock(&sk->sk_receive_queue.lock); |
543 | po->stats.tp_packets++; | |
544 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
545 | spin_unlock(&sk->sk_receive_queue.lock); | |
546 | sk->sk_data_ready(sk, skb->len); | |
547 | return 0; | |
548 | ||
549 | drop_n_acct: | |
550 | spin_lock(&sk->sk_receive_queue.lock); | |
551 | po->stats.tp_drops++; | |
552 | spin_unlock(&sk->sk_receive_queue.lock); | |
553 | ||
554 | drop_n_restore: | |
555 | if (skb_head != skb->data && skb_shared(skb)) { | |
556 | skb->data = skb_head; | |
557 | skb->len = skb_len; | |
558 | } | |
559 | drop: | |
560 | kfree_skb(skb); | |
561 | return 0; | |
562 | } | |
563 | ||
564 | #ifdef CONFIG_PACKET_MMAP | |
f2ccd8fa | 565 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
566 | { |
567 | struct sock *sk; | |
568 | struct packet_sock *po; | |
569 | struct sockaddr_ll *sll; | |
570 | struct tpacket_hdr *h; | |
571 | u8 * skb_head = skb->data; | |
572 | int skb_len = skb->len; | |
573 | unsigned snaplen; | |
574 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; | |
575 | unsigned short macoff, netoff; | |
576 | struct sk_buff *copy_skb = NULL; | |
577 | ||
578 | if (skb->pkt_type == PACKET_LOOPBACK) | |
579 | goto drop; | |
580 | ||
581 | sk = pt->af_packet_priv; | |
582 | po = pkt_sk(sk); | |
583 | ||
584 | if (dev->hard_header) { | |
585 | if (sk->sk_type != SOCK_DGRAM) | |
586 | skb_push(skb, skb->data - skb->mac.raw); | |
587 | else if (skb->pkt_type == PACKET_OUTGOING) { | |
588 | /* Special case: outgoing packets have ll header at head */ | |
589 | skb_pull(skb, skb->nh.raw - skb->data); | |
590 | if (skb->ip_summed == CHECKSUM_HW) | |
591 | status |= TP_STATUS_CSUMNOTREADY; | |
592 | } | |
593 | } | |
594 | ||
595 | snaplen = skb->len; | |
596 | ||
597 | if (sk->sk_filter) { | |
598 | unsigned res = run_filter(skb, sk, snaplen); | |
599 | if (res == 0) | |
600 | goto drop_n_restore; | |
601 | if (snaplen > res) | |
602 | snaplen = res; | |
603 | } | |
604 | ||
605 | if (sk->sk_type == SOCK_DGRAM) { | |
606 | macoff = netoff = TPACKET_ALIGN(TPACKET_HDRLEN) + 16; | |
607 | } else { | |
608 | unsigned maclen = skb->nh.raw - skb->data; | |
609 | netoff = TPACKET_ALIGN(TPACKET_HDRLEN + (maclen < 16 ? 16 : maclen)); | |
610 | macoff = netoff - maclen; | |
611 | } | |
612 | ||
613 | if (macoff + snaplen > po->frame_size) { | |
614 | if (po->copy_thresh && | |
615 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < | |
616 | (unsigned)sk->sk_rcvbuf) { | |
617 | if (skb_shared(skb)) { | |
618 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
619 | } else { | |
620 | copy_skb = skb_get(skb); | |
621 | skb_head = skb->data; | |
622 | } | |
623 | if (copy_skb) | |
624 | skb_set_owner_r(copy_skb, sk); | |
625 | } | |
626 | snaplen = po->frame_size - macoff; | |
627 | if ((int)snaplen < 0) | |
628 | snaplen = 0; | |
629 | } | |
630 | if (snaplen > skb->len-skb->data_len) | |
631 | snaplen = skb->len-skb->data_len; | |
632 | ||
633 | spin_lock(&sk->sk_receive_queue.lock); | |
634 | h = (struct tpacket_hdr *)packet_lookup_frame(po, po->head); | |
635 | ||
636 | if (h->tp_status) | |
637 | goto ring_is_full; | |
638 | po->head = po->head != po->frame_max ? po->head+1 : 0; | |
639 | po->stats.tp_packets++; | |
640 | if (copy_skb) { | |
641 | status |= TP_STATUS_COPY; | |
642 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
643 | } | |
644 | if (!po->stats.tp_drops) | |
645 | status &= ~TP_STATUS_LOSING; | |
646 | spin_unlock(&sk->sk_receive_queue.lock); | |
647 | ||
648 | memcpy((u8*)h + macoff, skb->data, snaplen); | |
649 | ||
650 | h->tp_len = skb->len; | |
651 | h->tp_snaplen = snaplen; | |
652 | h->tp_mac = macoff; | |
653 | h->tp_net = netoff; | |
a61bbcf2 PM |
654 | if (skb->tstamp.off_sec == 0) { |
655 | __net_timestamp(skb); | |
1da177e4 LT |
656 | sock_enable_timestamp(sk); |
657 | } | |
325ed823 HX |
658 | h->tp_sec = skb->tstamp.off_sec; |
659 | h->tp_usec = skb->tstamp.off_usec; | |
1da177e4 LT |
660 | |
661 | sll = (struct sockaddr_ll*)((u8*)h + TPACKET_ALIGN(sizeof(*h))); | |
662 | sll->sll_halen = 0; | |
663 | if (dev->hard_header_parse) | |
664 | sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); | |
665 | sll->sll_family = AF_PACKET; | |
666 | sll->sll_hatype = dev->type; | |
667 | sll->sll_protocol = skb->protocol; | |
668 | sll->sll_pkttype = skb->pkt_type; | |
669 | sll->sll_ifindex = dev->ifindex; | |
670 | ||
671 | h->tp_status = status; | |
672 | mb(); | |
673 | ||
674 | { | |
675 | struct page *p_start, *p_end; | |
676 | u8 *h_end = (u8 *)h + macoff + snaplen - 1; | |
677 | ||
678 | p_start = virt_to_page(h); | |
679 | p_end = virt_to_page(h_end); | |
680 | while (p_start <= p_end) { | |
681 | flush_dcache_page(p_start); | |
682 | p_start++; | |
683 | } | |
684 | } | |
685 | ||
686 | sk->sk_data_ready(sk, 0); | |
687 | ||
688 | drop_n_restore: | |
689 | if (skb_head != skb->data && skb_shared(skb)) { | |
690 | skb->data = skb_head; | |
691 | skb->len = skb_len; | |
692 | } | |
693 | drop: | |
694 | kfree_skb(skb); | |
695 | return 0; | |
696 | ||
697 | ring_is_full: | |
698 | po->stats.tp_drops++; | |
699 | spin_unlock(&sk->sk_receive_queue.lock); | |
700 | ||
701 | sk->sk_data_ready(sk, 0); | |
702 | if (copy_skb) | |
703 | kfree_skb(copy_skb); | |
704 | goto drop_n_restore; | |
705 | } | |
706 | ||
707 | #endif | |
708 | ||
709 | ||
710 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, | |
711 | struct msghdr *msg, size_t len) | |
712 | { | |
713 | struct sock *sk = sock->sk; | |
714 | struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name; | |
715 | struct sk_buff *skb; | |
716 | struct net_device *dev; | |
717 | unsigned short proto; | |
718 | unsigned char *addr; | |
719 | int ifindex, err, reserve = 0; | |
720 | ||
721 | /* | |
722 | * Get and verify the address. | |
723 | */ | |
724 | ||
725 | if (saddr == NULL) { | |
726 | struct packet_sock *po = pkt_sk(sk); | |
727 | ||
728 | ifindex = po->ifindex; | |
729 | proto = po->num; | |
730 | addr = NULL; | |
731 | } else { | |
732 | err = -EINVAL; | |
733 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
734 | goto out; | |
0fb375fb EB |
735 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
736 | goto out; | |
1da177e4 LT |
737 | ifindex = saddr->sll_ifindex; |
738 | proto = saddr->sll_protocol; | |
739 | addr = saddr->sll_addr; | |
740 | } | |
741 | ||
742 | ||
743 | dev = dev_get_by_index(ifindex); | |
744 | err = -ENXIO; | |
745 | if (dev == NULL) | |
746 | goto out_unlock; | |
747 | if (sock->type == SOCK_RAW) | |
748 | reserve = dev->hard_header_len; | |
749 | ||
750 | err = -EMSGSIZE; | |
751 | if (len > dev->mtu+reserve) | |
752 | goto out_unlock; | |
753 | ||
754 | skb = sock_alloc_send_skb(sk, len + LL_RESERVED_SPACE(dev), | |
755 | msg->msg_flags & MSG_DONTWAIT, &err); | |
756 | if (skb==NULL) | |
757 | goto out_unlock; | |
758 | ||
759 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
760 | skb->nh.raw = skb->data; | |
761 | ||
762 | if (dev->hard_header) { | |
763 | int res; | |
764 | err = -EINVAL; | |
765 | res = dev->hard_header(skb, dev, ntohs(proto), addr, NULL, len); | |
766 | if (sock->type != SOCK_DGRAM) { | |
767 | skb->tail = skb->data; | |
768 | skb->len = 0; | |
769 | } else if (res < 0) | |
770 | goto out_free; | |
771 | } | |
772 | ||
773 | /* Returns -EFAULT on error */ | |
774 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); | |
775 | if (err) | |
776 | goto out_free; | |
777 | ||
778 | skb->protocol = proto; | |
779 | skb->dev = dev; | |
780 | skb->priority = sk->sk_priority; | |
781 | ||
782 | err = -ENETDOWN; | |
783 | if (!(dev->flags & IFF_UP)) | |
784 | goto out_free; | |
785 | ||
786 | /* | |
787 | * Now send it | |
788 | */ | |
789 | ||
790 | err = dev_queue_xmit(skb); | |
791 | if (err > 0 && (err = net_xmit_errno(err)) != 0) | |
792 | goto out_unlock; | |
793 | ||
794 | dev_put(dev); | |
795 | ||
796 | return(len); | |
797 | ||
798 | out_free: | |
799 | kfree_skb(skb); | |
800 | out_unlock: | |
801 | if (dev) | |
802 | dev_put(dev); | |
803 | out: | |
804 | return err; | |
805 | } | |
806 | ||
807 | /* | |
808 | * Close a PACKET socket. This is fairly simple. We immediately go | |
809 | * to 'closed' state and remove our protocol entry in the device list. | |
810 | */ | |
811 | ||
812 | static int packet_release(struct socket *sock) | |
813 | { | |
814 | struct sock *sk = sock->sk; | |
815 | struct packet_sock *po; | |
816 | ||
817 | if (!sk) | |
818 | return 0; | |
819 | ||
820 | po = pkt_sk(sk); | |
821 | ||
822 | write_lock_bh(&packet_sklist_lock); | |
823 | sk_del_node_init(sk); | |
824 | write_unlock_bh(&packet_sklist_lock); | |
825 | ||
826 | /* | |
827 | * Unhook packet receive handler. | |
828 | */ | |
829 | ||
830 | if (po->running) { | |
831 | /* | |
832 | * Remove the protocol hook | |
833 | */ | |
834 | dev_remove_pack(&po->prot_hook); | |
835 | po->running = 0; | |
836 | po->num = 0; | |
837 | __sock_put(sk); | |
838 | } | |
839 | ||
840 | #ifdef CONFIG_PACKET_MULTICAST | |
841 | packet_flush_mclist(sk); | |
842 | #endif | |
843 | ||
844 | #ifdef CONFIG_PACKET_MMAP | |
845 | if (po->pg_vec) { | |
846 | struct tpacket_req req; | |
847 | memset(&req, 0, sizeof(req)); | |
848 | packet_set_ring(sk, &req, 1); | |
849 | } | |
850 | #endif | |
851 | ||
852 | /* | |
853 | * Now the socket is dead. No more input will appear. | |
854 | */ | |
855 | ||
856 | sock_orphan(sk); | |
857 | sock->sk = NULL; | |
858 | ||
859 | /* Purge queues */ | |
860 | ||
861 | skb_queue_purge(&sk->sk_receive_queue); | |
862 | ||
863 | sock_put(sk); | |
864 | return 0; | |
865 | } | |
866 | ||
867 | /* | |
868 | * Attach a packet hook. | |
869 | */ | |
870 | ||
871 | static int packet_do_bind(struct sock *sk, struct net_device *dev, int protocol) | |
872 | { | |
873 | struct packet_sock *po = pkt_sk(sk); | |
874 | /* | |
875 | * Detach an existing hook if present. | |
876 | */ | |
877 | ||
878 | lock_sock(sk); | |
879 | ||
880 | spin_lock(&po->bind_lock); | |
881 | if (po->running) { | |
882 | __sock_put(sk); | |
883 | po->running = 0; | |
884 | po->num = 0; | |
885 | spin_unlock(&po->bind_lock); | |
886 | dev_remove_pack(&po->prot_hook); | |
887 | spin_lock(&po->bind_lock); | |
888 | } | |
889 | ||
890 | po->num = protocol; | |
891 | po->prot_hook.type = protocol; | |
892 | po->prot_hook.dev = dev; | |
893 | ||
894 | po->ifindex = dev ? dev->ifindex : 0; | |
895 | ||
896 | if (protocol == 0) | |
897 | goto out_unlock; | |
898 | ||
899 | if (dev) { | |
900 | if (dev->flags&IFF_UP) { | |
901 | dev_add_pack(&po->prot_hook); | |
902 | sock_hold(sk); | |
903 | po->running = 1; | |
904 | } else { | |
905 | sk->sk_err = ENETDOWN; | |
906 | if (!sock_flag(sk, SOCK_DEAD)) | |
907 | sk->sk_error_report(sk); | |
908 | } | |
909 | } else { | |
910 | dev_add_pack(&po->prot_hook); | |
911 | sock_hold(sk); | |
912 | po->running = 1; | |
913 | } | |
914 | ||
915 | out_unlock: | |
916 | spin_unlock(&po->bind_lock); | |
917 | release_sock(sk); | |
918 | return 0; | |
919 | } | |
920 | ||
921 | /* | |
922 | * Bind a packet socket to a device | |
923 | */ | |
924 | ||
925 | #ifdef CONFIG_SOCK_PACKET | |
926 | ||
927 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
928 | { | |
929 | struct sock *sk=sock->sk; | |
930 | char name[15]; | |
931 | struct net_device *dev; | |
932 | int err = -ENODEV; | |
933 | ||
934 | /* | |
935 | * Check legality | |
936 | */ | |
937 | ||
938 | if(addr_len!=sizeof(struct sockaddr)) | |
939 | return -EINVAL; | |
940 | strlcpy(name,uaddr->sa_data,sizeof(name)); | |
941 | ||
942 | dev = dev_get_by_name(name); | |
943 | if (dev) { | |
944 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); | |
945 | dev_put(dev); | |
946 | } | |
947 | return err; | |
948 | } | |
949 | #endif | |
950 | ||
951 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
952 | { | |
953 | struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; | |
954 | struct sock *sk=sock->sk; | |
955 | struct net_device *dev = NULL; | |
956 | int err; | |
957 | ||
958 | ||
959 | /* | |
960 | * Check legality | |
961 | */ | |
962 | ||
963 | if (addr_len < sizeof(struct sockaddr_ll)) | |
964 | return -EINVAL; | |
965 | if (sll->sll_family != AF_PACKET) | |
966 | return -EINVAL; | |
967 | ||
968 | if (sll->sll_ifindex) { | |
969 | err = -ENODEV; | |
970 | dev = dev_get_by_index(sll->sll_ifindex); | |
971 | if (dev == NULL) | |
972 | goto out; | |
973 | } | |
974 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
975 | if (dev) | |
976 | dev_put(dev); | |
977 | ||
978 | out: | |
979 | return err; | |
980 | } | |
981 | ||
982 | static struct proto packet_proto = { | |
983 | .name = "PACKET", | |
984 | .owner = THIS_MODULE, | |
985 | .obj_size = sizeof(struct packet_sock), | |
986 | }; | |
987 | ||
988 | /* | |
989 | * Create a packet of type SOCK_PACKET. | |
990 | */ | |
991 | ||
992 | static int packet_create(struct socket *sock, int protocol) | |
993 | { | |
994 | struct sock *sk; | |
995 | struct packet_sock *po; | |
996 | int err; | |
997 | ||
998 | if (!capable(CAP_NET_RAW)) | |
999 | return -EPERM; | |
1000 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW | |
1001 | #ifdef CONFIG_SOCK_PACKET | |
1002 | && sock->type != SOCK_PACKET | |
1003 | #endif | |
1004 | ) | |
1005 | return -ESOCKTNOSUPPORT; | |
1006 | ||
1007 | sock->state = SS_UNCONNECTED; | |
1008 | ||
1009 | err = -ENOBUFS; | |
1010 | sk = sk_alloc(PF_PACKET, GFP_KERNEL, &packet_proto, 1); | |
1011 | if (sk == NULL) | |
1012 | goto out; | |
1013 | ||
1014 | sock->ops = &packet_ops; | |
1015 | #ifdef CONFIG_SOCK_PACKET | |
1016 | if (sock->type == SOCK_PACKET) | |
1017 | sock->ops = &packet_ops_spkt; | |
1018 | #endif | |
1019 | sock_init_data(sock, sk); | |
1020 | ||
1021 | po = pkt_sk(sk); | |
1022 | sk->sk_family = PF_PACKET; | |
1023 | po->num = protocol; | |
1024 | ||
1025 | sk->sk_destruct = packet_sock_destruct; | |
1026 | atomic_inc(&packet_socks_nr); | |
1027 | ||
1028 | /* | |
1029 | * Attach a protocol block | |
1030 | */ | |
1031 | ||
1032 | spin_lock_init(&po->bind_lock); | |
1033 | po->prot_hook.func = packet_rcv; | |
1034 | #ifdef CONFIG_SOCK_PACKET | |
1035 | if (sock->type == SOCK_PACKET) | |
1036 | po->prot_hook.func = packet_rcv_spkt; | |
1037 | #endif | |
1038 | po->prot_hook.af_packet_priv = sk; | |
1039 | ||
1040 | if (protocol) { | |
1041 | po->prot_hook.type = protocol; | |
1042 | dev_add_pack(&po->prot_hook); | |
1043 | sock_hold(sk); | |
1044 | po->running = 1; | |
1045 | } | |
1046 | ||
1047 | write_lock_bh(&packet_sklist_lock); | |
1048 | sk_add_node(sk, &packet_sklist); | |
1049 | write_unlock_bh(&packet_sklist_lock); | |
1050 | return(0); | |
1051 | out: | |
1052 | return err; | |
1053 | } | |
1054 | ||
1055 | /* | |
1056 | * Pull a packet from our receive queue and hand it to the user. | |
1057 | * If necessary we block. | |
1058 | */ | |
1059 | ||
1060 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1061 | struct msghdr *msg, size_t len, int flags) | |
1062 | { | |
1063 | struct sock *sk = sock->sk; | |
1064 | struct sk_buff *skb; | |
1065 | int copied, err; | |
0fb375fb | 1066 | struct sockaddr_ll *sll; |
1da177e4 LT |
1067 | |
1068 | err = -EINVAL; | |
1069 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) | |
1070 | goto out; | |
1071 | ||
1072 | #if 0 | |
1073 | /* What error should we return now? EUNATTACH? */ | |
1074 | if (pkt_sk(sk)->ifindex < 0) | |
1075 | return -ENODEV; | |
1076 | #endif | |
1077 | ||
1da177e4 LT |
1078 | /* |
1079 | * Call the generic datagram receiver. This handles all sorts | |
1080 | * of horrible races and re-entrancy so we can forget about it | |
1081 | * in the protocol layers. | |
1082 | * | |
1083 | * Now it will return ENETDOWN, if device have just gone down, | |
1084 | * but then it will block. | |
1085 | */ | |
1086 | ||
1087 | skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&err); | |
1088 | ||
1089 | /* | |
1090 | * An error occurred so return it. Because skb_recv_datagram() | |
1091 | * handles the blocking we don't see and worry about blocking | |
1092 | * retries. | |
1093 | */ | |
1094 | ||
1095 | if(skb==NULL) | |
1096 | goto out; | |
1097 | ||
0fb375fb EB |
1098 | /* |
1099 | * If the address length field is there to be filled in, we fill | |
1100 | * it in now. | |
1101 | */ | |
1102 | ||
1103 | sll = (struct sockaddr_ll*)skb->cb; | |
1104 | if (sock->type == SOCK_PACKET) | |
1105 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
1106 | else | |
1107 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); | |
1108 | ||
1da177e4 LT |
1109 | /* |
1110 | * You lose any data beyond the buffer you gave. If it worries a | |
1111 | * user program they can ask the device for its MTU anyway. | |
1112 | */ | |
1113 | ||
1114 | copied = skb->len; | |
1115 | if (copied > len) | |
1116 | { | |
1117 | copied=len; | |
1118 | msg->msg_flags|=MSG_TRUNC; | |
1119 | } | |
1120 | ||
1121 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1122 | if (err) | |
1123 | goto out_free; | |
1124 | ||
1125 | sock_recv_timestamp(msg, sk, skb); | |
1126 | ||
1127 | if (msg->msg_name) | |
1128 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
1129 | ||
1130 | /* | |
1131 | * Free or return the buffer as appropriate. Again this | |
1132 | * hides all the races and re-entrancy issues from us. | |
1133 | */ | |
1134 | err = (flags&MSG_TRUNC) ? skb->len : copied; | |
1135 | ||
1136 | out_free: | |
1137 | skb_free_datagram(sk, skb); | |
1138 | out: | |
1139 | return err; | |
1140 | } | |
1141 | ||
1142 | #ifdef CONFIG_SOCK_PACKET | |
1143 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, | |
1144 | int *uaddr_len, int peer) | |
1145 | { | |
1146 | struct net_device *dev; | |
1147 | struct sock *sk = sock->sk; | |
1148 | ||
1149 | if (peer) | |
1150 | return -EOPNOTSUPP; | |
1151 | ||
1152 | uaddr->sa_family = AF_PACKET; | |
1153 | dev = dev_get_by_index(pkt_sk(sk)->ifindex); | |
1154 | if (dev) { | |
1155 | strlcpy(uaddr->sa_data, dev->name, 15); | |
1156 | dev_put(dev); | |
1157 | } else | |
1158 | memset(uaddr->sa_data, 0, 14); | |
1159 | *uaddr_len = sizeof(*uaddr); | |
1160 | ||
1161 | return 0; | |
1162 | } | |
1163 | #endif | |
1164 | ||
1165 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
1166 | int *uaddr_len, int peer) | |
1167 | { | |
1168 | struct net_device *dev; | |
1169 | struct sock *sk = sock->sk; | |
1170 | struct packet_sock *po = pkt_sk(sk); | |
1171 | struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; | |
1172 | ||
1173 | if (peer) | |
1174 | return -EOPNOTSUPP; | |
1175 | ||
1176 | sll->sll_family = AF_PACKET; | |
1177 | sll->sll_ifindex = po->ifindex; | |
1178 | sll->sll_protocol = po->num; | |
1179 | dev = dev_get_by_index(po->ifindex); | |
1180 | if (dev) { | |
1181 | sll->sll_hatype = dev->type; | |
1182 | sll->sll_halen = dev->addr_len; | |
1183 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1184 | dev_put(dev); | |
1185 | } else { | |
1186 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
1187 | sll->sll_halen = 0; | |
1188 | } | |
0fb375fb | 1189 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
1190 | |
1191 | return 0; | |
1192 | } | |
1193 | ||
1194 | #ifdef CONFIG_PACKET_MULTICAST | |
1195 | static void packet_dev_mc(struct net_device *dev, struct packet_mclist *i, int what) | |
1196 | { | |
1197 | switch (i->type) { | |
1198 | case PACKET_MR_MULTICAST: | |
1199 | if (what > 0) | |
1200 | dev_mc_add(dev, i->addr, i->alen, 0); | |
1201 | else | |
1202 | dev_mc_delete(dev, i->addr, i->alen, 0); | |
1203 | break; | |
1204 | case PACKET_MR_PROMISC: | |
1205 | dev_set_promiscuity(dev, what); | |
1206 | break; | |
1207 | case PACKET_MR_ALLMULTI: | |
1208 | dev_set_allmulti(dev, what); | |
1209 | break; | |
1210 | default:; | |
1211 | } | |
1212 | } | |
1213 | ||
1214 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
1215 | { | |
1216 | for ( ; i; i=i->next) { | |
1217 | if (i->ifindex == dev->ifindex) | |
1218 | packet_dev_mc(dev, i, what); | |
1219 | } | |
1220 | } | |
1221 | ||
0fb375fb | 1222 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1223 | { |
1224 | struct packet_sock *po = pkt_sk(sk); | |
1225 | struct packet_mclist *ml, *i; | |
1226 | struct net_device *dev; | |
1227 | int err; | |
1228 | ||
1229 | rtnl_lock(); | |
1230 | ||
1231 | err = -ENODEV; | |
1232 | dev = __dev_get_by_index(mreq->mr_ifindex); | |
1233 | if (!dev) | |
1234 | goto done; | |
1235 | ||
1236 | err = -EINVAL; | |
1237 | if (mreq->mr_alen > dev->addr_len) | |
1238 | goto done; | |
1239 | ||
1240 | err = -ENOBUFS; | |
8b3a7005 | 1241 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
1242 | if (i == NULL) |
1243 | goto done; | |
1244 | ||
1245 | err = 0; | |
1246 | for (ml = po->mclist; ml; ml = ml->next) { | |
1247 | if (ml->ifindex == mreq->mr_ifindex && | |
1248 | ml->type == mreq->mr_type && | |
1249 | ml->alen == mreq->mr_alen && | |
1250 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1251 | ml->count++; | |
1252 | /* Free the new element ... */ | |
1253 | kfree(i); | |
1254 | goto done; | |
1255 | } | |
1256 | } | |
1257 | ||
1258 | i->type = mreq->mr_type; | |
1259 | i->ifindex = mreq->mr_ifindex; | |
1260 | i->alen = mreq->mr_alen; | |
1261 | memcpy(i->addr, mreq->mr_address, i->alen); | |
1262 | i->count = 1; | |
1263 | i->next = po->mclist; | |
1264 | po->mclist = i; | |
1265 | packet_dev_mc(dev, i, +1); | |
1266 | ||
1267 | done: | |
1268 | rtnl_unlock(); | |
1269 | return err; | |
1270 | } | |
1271 | ||
0fb375fb | 1272 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1273 | { |
1274 | struct packet_mclist *ml, **mlp; | |
1275 | ||
1276 | rtnl_lock(); | |
1277 | ||
1278 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
1279 | if (ml->ifindex == mreq->mr_ifindex && | |
1280 | ml->type == mreq->mr_type && | |
1281 | ml->alen == mreq->mr_alen && | |
1282 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1283 | if (--ml->count == 0) { | |
1284 | struct net_device *dev; | |
1285 | *mlp = ml->next; | |
1286 | dev = dev_get_by_index(ml->ifindex); | |
1287 | if (dev) { | |
1288 | packet_dev_mc(dev, ml, -1); | |
1289 | dev_put(dev); | |
1290 | } | |
1291 | kfree(ml); | |
1292 | } | |
1293 | rtnl_unlock(); | |
1294 | return 0; | |
1295 | } | |
1296 | } | |
1297 | rtnl_unlock(); | |
1298 | return -EADDRNOTAVAIL; | |
1299 | } | |
1300 | ||
1301 | static void packet_flush_mclist(struct sock *sk) | |
1302 | { | |
1303 | struct packet_sock *po = pkt_sk(sk); | |
1304 | struct packet_mclist *ml; | |
1305 | ||
1306 | if (!po->mclist) | |
1307 | return; | |
1308 | ||
1309 | rtnl_lock(); | |
1310 | while ((ml = po->mclist) != NULL) { | |
1311 | struct net_device *dev; | |
1312 | ||
1313 | po->mclist = ml->next; | |
1314 | if ((dev = dev_get_by_index(ml->ifindex)) != NULL) { | |
1315 | packet_dev_mc(dev, ml, -1); | |
1316 | dev_put(dev); | |
1317 | } | |
1318 | kfree(ml); | |
1319 | } | |
1320 | rtnl_unlock(); | |
1321 | } | |
1322 | #endif | |
1323 | ||
1324 | static int | |
1325 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) | |
1326 | { | |
1327 | struct sock *sk = sock->sk; | |
1328 | int ret; | |
1329 | ||
1330 | if (level != SOL_PACKET) | |
1331 | return -ENOPROTOOPT; | |
1332 | ||
1333 | switch(optname) { | |
1334 | #ifdef CONFIG_PACKET_MULTICAST | |
1335 | case PACKET_ADD_MEMBERSHIP: | |
1336 | case PACKET_DROP_MEMBERSHIP: | |
1337 | { | |
0fb375fb EB |
1338 | struct packet_mreq_max mreq; |
1339 | int len = optlen; | |
1340 | memset(&mreq, 0, sizeof(mreq)); | |
1341 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 1342 | return -EINVAL; |
0fb375fb EB |
1343 | if (len > sizeof(mreq)) |
1344 | len = sizeof(mreq); | |
1345 | if (copy_from_user(&mreq,optval,len)) | |
1da177e4 | 1346 | return -EFAULT; |
0fb375fb EB |
1347 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
1348 | return -EINVAL; | |
1da177e4 LT |
1349 | if (optname == PACKET_ADD_MEMBERSHIP) |
1350 | ret = packet_mc_add(sk, &mreq); | |
1351 | else | |
1352 | ret = packet_mc_drop(sk, &mreq); | |
1353 | return ret; | |
1354 | } | |
1355 | #endif | |
1356 | #ifdef CONFIG_PACKET_MMAP | |
1357 | case PACKET_RX_RING: | |
1358 | { | |
1359 | struct tpacket_req req; | |
1360 | ||
1361 | if (optlen<sizeof(req)) | |
1362 | return -EINVAL; | |
1363 | if (copy_from_user(&req,optval,sizeof(req))) | |
1364 | return -EFAULT; | |
1365 | return packet_set_ring(sk, &req, 0); | |
1366 | } | |
1367 | case PACKET_COPY_THRESH: | |
1368 | { | |
1369 | int val; | |
1370 | ||
1371 | if (optlen!=sizeof(val)) | |
1372 | return -EINVAL; | |
1373 | if (copy_from_user(&val,optval,sizeof(val))) | |
1374 | return -EFAULT; | |
1375 | ||
1376 | pkt_sk(sk)->copy_thresh = val; | |
1377 | return 0; | |
1378 | } | |
1379 | #endif | |
1380 | default: | |
1381 | return -ENOPROTOOPT; | |
1382 | } | |
1383 | } | |
1384 | ||
1385 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
1386 | char __user *optval, int __user *optlen) | |
1387 | { | |
1388 | int len; | |
1389 | struct sock *sk = sock->sk; | |
1390 | struct packet_sock *po = pkt_sk(sk); | |
1391 | ||
1392 | if (level != SOL_PACKET) | |
1393 | return -ENOPROTOOPT; | |
1394 | ||
1395 | if (get_user(len,optlen)) | |
1396 | return -EFAULT; | |
1397 | ||
1398 | if (len < 0) | |
1399 | return -EINVAL; | |
1400 | ||
1401 | switch(optname) { | |
1402 | case PACKET_STATISTICS: | |
1403 | { | |
1404 | struct tpacket_stats st; | |
1405 | ||
1406 | if (len > sizeof(struct tpacket_stats)) | |
1407 | len = sizeof(struct tpacket_stats); | |
1408 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1409 | st = po->stats; | |
1410 | memset(&po->stats, 0, sizeof(st)); | |
1411 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1412 | st.tp_packets += st.tp_drops; | |
1413 | ||
1414 | if (copy_to_user(optval, &st, len)) | |
1415 | return -EFAULT; | |
1416 | break; | |
1417 | } | |
1418 | default: | |
1419 | return -ENOPROTOOPT; | |
1420 | } | |
1421 | ||
1422 | if (put_user(len, optlen)) | |
1423 | return -EFAULT; | |
1424 | return 0; | |
1425 | } | |
1426 | ||
1427 | ||
1428 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) | |
1429 | { | |
1430 | struct sock *sk; | |
1431 | struct hlist_node *node; | |
1432 | struct net_device *dev = (struct net_device*)data; | |
1433 | ||
1434 | read_lock(&packet_sklist_lock); | |
1435 | sk_for_each(sk, node, &packet_sklist) { | |
1436 | struct packet_sock *po = pkt_sk(sk); | |
1437 | ||
1438 | switch (msg) { | |
1439 | case NETDEV_UNREGISTER: | |
1440 | #ifdef CONFIG_PACKET_MULTICAST | |
1441 | if (po->mclist) | |
1442 | packet_dev_mclist(dev, po->mclist, -1); | |
1443 | // fallthrough | |
1444 | #endif | |
1445 | case NETDEV_DOWN: | |
1446 | if (dev->ifindex == po->ifindex) { | |
1447 | spin_lock(&po->bind_lock); | |
1448 | if (po->running) { | |
1449 | __dev_remove_pack(&po->prot_hook); | |
1450 | __sock_put(sk); | |
1451 | po->running = 0; | |
1452 | sk->sk_err = ENETDOWN; | |
1453 | if (!sock_flag(sk, SOCK_DEAD)) | |
1454 | sk->sk_error_report(sk); | |
1455 | } | |
1456 | if (msg == NETDEV_UNREGISTER) { | |
1457 | po->ifindex = -1; | |
1458 | po->prot_hook.dev = NULL; | |
1459 | } | |
1460 | spin_unlock(&po->bind_lock); | |
1461 | } | |
1462 | break; | |
1463 | case NETDEV_UP: | |
1464 | spin_lock(&po->bind_lock); | |
1465 | if (dev->ifindex == po->ifindex && po->num && | |
1466 | !po->running) { | |
1467 | dev_add_pack(&po->prot_hook); | |
1468 | sock_hold(sk); | |
1469 | po->running = 1; | |
1470 | } | |
1471 | spin_unlock(&po->bind_lock); | |
1472 | break; | |
1473 | } | |
1474 | } | |
1475 | read_unlock(&packet_sklist_lock); | |
1476 | return NOTIFY_DONE; | |
1477 | } | |
1478 | ||
1479 | ||
1480 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
1481 | unsigned long arg) | |
1482 | { | |
1483 | struct sock *sk = sock->sk; | |
1484 | ||
1485 | switch(cmd) { | |
1486 | case SIOCOUTQ: | |
1487 | { | |
1488 | int amount = atomic_read(&sk->sk_wmem_alloc); | |
1489 | return put_user(amount, (int __user *)arg); | |
1490 | } | |
1491 | case SIOCINQ: | |
1492 | { | |
1493 | struct sk_buff *skb; | |
1494 | int amount = 0; | |
1495 | ||
1496 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1497 | skb = skb_peek(&sk->sk_receive_queue); | |
1498 | if (skb) | |
1499 | amount = skb->len; | |
1500 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1501 | return put_user(amount, (int __user *)arg); | |
1502 | } | |
1503 | case SIOCGSTAMP: | |
1504 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
1505 | ||
1506 | #ifdef CONFIG_INET | |
1507 | case SIOCADDRT: | |
1508 | case SIOCDELRT: | |
1509 | case SIOCDARP: | |
1510 | case SIOCGARP: | |
1511 | case SIOCSARP: | |
1512 | case SIOCGIFADDR: | |
1513 | case SIOCSIFADDR: | |
1514 | case SIOCGIFBRDADDR: | |
1515 | case SIOCSIFBRDADDR: | |
1516 | case SIOCGIFNETMASK: | |
1517 | case SIOCSIFNETMASK: | |
1518 | case SIOCGIFDSTADDR: | |
1519 | case SIOCSIFDSTADDR: | |
1520 | case SIOCSIFFLAGS: | |
1521 | return inet_dgram_ops.ioctl(sock, cmd, arg); | |
1522 | #endif | |
1523 | ||
1524 | default: | |
b5e5fa5e | 1525 | return -ENOIOCTLCMD; |
1da177e4 LT |
1526 | } |
1527 | return 0; | |
1528 | } | |
1529 | ||
1530 | #ifndef CONFIG_PACKET_MMAP | |
1531 | #define packet_mmap sock_no_mmap | |
1532 | #define packet_poll datagram_poll | |
1533 | #else | |
1534 | ||
1535 | static unsigned int packet_poll(struct file * file, struct socket *sock, | |
1536 | poll_table *wait) | |
1537 | { | |
1538 | struct sock *sk = sock->sk; | |
1539 | struct packet_sock *po = pkt_sk(sk); | |
1540 | unsigned int mask = datagram_poll(file, sock, wait); | |
1541 | ||
1542 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1543 | if (po->pg_vec) { | |
1544 | unsigned last = po->head ? po->head-1 : po->frame_max; | |
1545 | struct tpacket_hdr *h; | |
1546 | ||
1547 | h = (struct tpacket_hdr *)packet_lookup_frame(po, last); | |
1548 | ||
1549 | if (h->tp_status) | |
1550 | mask |= POLLIN | POLLRDNORM; | |
1551 | } | |
1552 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1553 | return mask; | |
1554 | } | |
1555 | ||
1556 | ||
1557 | /* Dirty? Well, I still did not learn better way to account | |
1558 | * for user mmaps. | |
1559 | */ | |
1560 | ||
1561 | static void packet_mm_open(struct vm_area_struct *vma) | |
1562 | { | |
1563 | struct file *file = vma->vm_file; | |
b69aee04 | 1564 | struct socket * sock = file->private_data; |
1da177e4 LT |
1565 | struct sock *sk = sock->sk; |
1566 | ||
1567 | if (sk) | |
1568 | atomic_inc(&pkt_sk(sk)->mapped); | |
1569 | } | |
1570 | ||
1571 | static void packet_mm_close(struct vm_area_struct *vma) | |
1572 | { | |
1573 | struct file *file = vma->vm_file; | |
b69aee04 | 1574 | struct socket * sock = file->private_data; |
1da177e4 LT |
1575 | struct sock *sk = sock->sk; |
1576 | ||
1577 | if (sk) | |
1578 | atomic_dec(&pkt_sk(sk)->mapped); | |
1579 | } | |
1580 | ||
1581 | static struct vm_operations_struct packet_mmap_ops = { | |
1582 | .open = packet_mm_open, | |
1583 | .close =packet_mm_close, | |
1584 | }; | |
1585 | ||
1586 | static inline struct page *pg_vec_endpage(char *one_pg_vec, unsigned int order) | |
1587 | { | |
1588 | return virt_to_page(one_pg_vec + (PAGE_SIZE << order) - 1); | |
1589 | } | |
1590 | ||
4ebf0ae2 | 1591 | static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len) |
1da177e4 LT |
1592 | { |
1593 | int i; | |
1594 | ||
4ebf0ae2 DM |
1595 | for (i = 0; i < len; i++) { |
1596 | if (likely(pg_vec[i])) | |
1597 | free_pages((unsigned long) pg_vec[i], order); | |
1da177e4 LT |
1598 | } |
1599 | kfree(pg_vec); | |
1600 | } | |
1601 | ||
4ebf0ae2 DM |
1602 | static inline char *alloc_one_pg_vec_page(unsigned long order) |
1603 | { | |
1604 | return (char *) __get_free_pages(GFP_KERNEL | __GFP_COMP | __GFP_ZERO, | |
1605 | order); | |
1606 | } | |
1607 | ||
1608 | static char **alloc_pg_vec(struct tpacket_req *req, int order) | |
1609 | { | |
1610 | unsigned int block_nr = req->tp_block_nr; | |
1611 | char **pg_vec; | |
1612 | int i; | |
1613 | ||
1614 | pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL); | |
1615 | if (unlikely(!pg_vec)) | |
1616 | goto out; | |
1617 | ||
1618 | for (i = 0; i < block_nr; i++) { | |
1619 | pg_vec[i] = alloc_one_pg_vec_page(order); | |
1620 | if (unlikely(!pg_vec[i])) | |
1621 | goto out_free_pgvec; | |
1622 | } | |
1623 | ||
1624 | out: | |
1625 | return pg_vec; | |
1626 | ||
1627 | out_free_pgvec: | |
1628 | free_pg_vec(pg_vec, order, block_nr); | |
1629 | pg_vec = NULL; | |
1630 | goto out; | |
1631 | } | |
1da177e4 LT |
1632 | |
1633 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing) | |
1634 | { | |
1635 | char **pg_vec = NULL; | |
1636 | struct packet_sock *po = pkt_sk(sk); | |
1637 | int was_running, num, order = 0; | |
1638 | int err = 0; | |
1639 | ||
1640 | if (req->tp_block_nr) { | |
1641 | int i, l; | |
1642 | ||
1643 | /* Sanity tests and some calculations */ | |
1644 | ||
4ebf0ae2 | 1645 | if (unlikely(po->pg_vec)) |
1da177e4 LT |
1646 | return -EBUSY; |
1647 | ||
4ebf0ae2 | 1648 | if (unlikely((int)req->tp_block_size <= 0)) |
1da177e4 | 1649 | return -EINVAL; |
4ebf0ae2 | 1650 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
1da177e4 | 1651 | return -EINVAL; |
4ebf0ae2 | 1652 | if (unlikely(req->tp_frame_size < TPACKET_HDRLEN)) |
1da177e4 | 1653 | return -EINVAL; |
4ebf0ae2 | 1654 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
1da177e4 LT |
1655 | return -EINVAL; |
1656 | ||
1657 | po->frames_per_block = req->tp_block_size/req->tp_frame_size; | |
4ebf0ae2 | 1658 | if (unlikely(po->frames_per_block <= 0)) |
1da177e4 | 1659 | return -EINVAL; |
4ebf0ae2 DM |
1660 | if (unlikely((po->frames_per_block * req->tp_block_nr) != |
1661 | req->tp_frame_nr)) | |
1da177e4 | 1662 | return -EINVAL; |
1da177e4 LT |
1663 | |
1664 | err = -ENOMEM; | |
4ebf0ae2 DM |
1665 | order = get_order(req->tp_block_size); |
1666 | pg_vec = alloc_pg_vec(req, order); | |
1667 | if (unlikely(!pg_vec)) | |
1da177e4 | 1668 | goto out; |
1da177e4 LT |
1669 | |
1670 | l = 0; | |
4ebf0ae2 | 1671 | for (i = 0; i < req->tp_block_nr; i++) { |
1da177e4 LT |
1672 | char *ptr = pg_vec[i]; |
1673 | struct tpacket_hdr *header; | |
1674 | int k; | |
1675 | ||
4ebf0ae2 DM |
1676 | for (k = 0; k < po->frames_per_block; k++) { |
1677 | header = (struct tpacket_hdr *) ptr; | |
1da177e4 LT |
1678 | header->tp_status = TP_STATUS_KERNEL; |
1679 | ptr += req->tp_frame_size; | |
1680 | } | |
1681 | } | |
1682 | /* Done */ | |
1683 | } else { | |
4ebf0ae2 | 1684 | if (unlikely(req->tp_frame_nr)) |
1da177e4 LT |
1685 | return -EINVAL; |
1686 | } | |
1687 | ||
1688 | lock_sock(sk); | |
1689 | ||
1690 | /* Detach socket from network */ | |
1691 | spin_lock(&po->bind_lock); | |
1692 | was_running = po->running; | |
1693 | num = po->num; | |
1694 | if (was_running) { | |
1695 | __dev_remove_pack(&po->prot_hook); | |
1696 | po->num = 0; | |
1697 | po->running = 0; | |
1698 | __sock_put(sk); | |
1699 | } | |
1700 | spin_unlock(&po->bind_lock); | |
1701 | ||
1702 | synchronize_net(); | |
1703 | ||
1704 | err = -EBUSY; | |
1705 | if (closing || atomic_read(&po->mapped) == 0) { | |
1706 | err = 0; | |
1707 | #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) | |
1708 | ||
1709 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1710 | pg_vec = XC(po->pg_vec, pg_vec); | |
4ebf0ae2 | 1711 | po->frame_max = (req->tp_frame_nr - 1); |
1da177e4 LT |
1712 | po->head = 0; |
1713 | po->frame_size = req->tp_frame_size; | |
1714 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1715 | ||
1716 | order = XC(po->pg_vec_order, order); | |
1717 | req->tp_block_nr = XC(po->pg_vec_len, req->tp_block_nr); | |
1718 | ||
1719 | po->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
1720 | po->prot_hook.func = po->pg_vec ? tpacket_rcv : packet_rcv; | |
1721 | skb_queue_purge(&sk->sk_receive_queue); | |
1722 | #undef XC | |
1723 | if (atomic_read(&po->mapped)) | |
1724 | printk(KERN_DEBUG "packet_mmap: vma is busy: %d\n", atomic_read(&po->mapped)); | |
1725 | } | |
1726 | ||
1727 | spin_lock(&po->bind_lock); | |
1728 | if (was_running && !po->running) { | |
1729 | sock_hold(sk); | |
1730 | po->running = 1; | |
1731 | po->num = num; | |
1732 | dev_add_pack(&po->prot_hook); | |
1733 | } | |
1734 | spin_unlock(&po->bind_lock); | |
1735 | ||
1736 | release_sock(sk); | |
1737 | ||
1da177e4 LT |
1738 | if (pg_vec) |
1739 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
1740 | out: | |
1741 | return err; | |
1742 | } | |
1743 | ||
1744 | static int packet_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
1745 | { | |
1746 | struct sock *sk = sock->sk; | |
1747 | struct packet_sock *po = pkt_sk(sk); | |
1748 | unsigned long size; | |
1749 | unsigned long start; | |
1750 | int err = -EINVAL; | |
1751 | int i; | |
1752 | ||
1753 | if (vma->vm_pgoff) | |
1754 | return -EINVAL; | |
1755 | ||
1756 | size = vma->vm_end - vma->vm_start; | |
1757 | ||
1758 | lock_sock(sk); | |
1759 | if (po->pg_vec == NULL) | |
1760 | goto out; | |
1761 | if (size != po->pg_vec_len*po->pg_vec_pages*PAGE_SIZE) | |
1762 | goto out; | |
1763 | ||
1da177e4 | 1764 | start = vma->vm_start; |
4ebf0ae2 DM |
1765 | for (i = 0; i < po->pg_vec_len; i++) { |
1766 | struct page *page = virt_to_page(po->pg_vec[i]); | |
1767 | int pg_num; | |
1768 | ||
1769 | for (pg_num = 0; pg_num < po->pg_vec_pages; pg_num++, page++) { | |
1770 | err = vm_insert_page(vma, start, page); | |
1771 | if (unlikely(err)) | |
1772 | goto out; | |
1773 | start += PAGE_SIZE; | |
1774 | } | |
1da177e4 | 1775 | } |
4ebf0ae2 | 1776 | atomic_inc(&po->mapped); |
1da177e4 LT |
1777 | vma->vm_ops = &packet_mmap_ops; |
1778 | err = 0; | |
1779 | ||
1780 | out: | |
1781 | release_sock(sk); | |
1782 | return err; | |
1783 | } | |
1784 | #endif | |
1785 | ||
1786 | ||
1787 | #ifdef CONFIG_SOCK_PACKET | |
90ddc4f0 | 1788 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
1789 | .family = PF_PACKET, |
1790 | .owner = THIS_MODULE, | |
1791 | .release = packet_release, | |
1792 | .bind = packet_bind_spkt, | |
1793 | .connect = sock_no_connect, | |
1794 | .socketpair = sock_no_socketpair, | |
1795 | .accept = sock_no_accept, | |
1796 | .getname = packet_getname_spkt, | |
1797 | .poll = datagram_poll, | |
1798 | .ioctl = packet_ioctl, | |
1799 | .listen = sock_no_listen, | |
1800 | .shutdown = sock_no_shutdown, | |
1801 | .setsockopt = sock_no_setsockopt, | |
1802 | .getsockopt = sock_no_getsockopt, | |
1803 | .sendmsg = packet_sendmsg_spkt, | |
1804 | .recvmsg = packet_recvmsg, | |
1805 | .mmap = sock_no_mmap, | |
1806 | .sendpage = sock_no_sendpage, | |
1807 | }; | |
1808 | #endif | |
1809 | ||
90ddc4f0 | 1810 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
1811 | .family = PF_PACKET, |
1812 | .owner = THIS_MODULE, | |
1813 | .release = packet_release, | |
1814 | .bind = packet_bind, | |
1815 | .connect = sock_no_connect, | |
1816 | .socketpair = sock_no_socketpair, | |
1817 | .accept = sock_no_accept, | |
1818 | .getname = packet_getname, | |
1819 | .poll = packet_poll, | |
1820 | .ioctl = packet_ioctl, | |
1821 | .listen = sock_no_listen, | |
1822 | .shutdown = sock_no_shutdown, | |
1823 | .setsockopt = packet_setsockopt, | |
1824 | .getsockopt = packet_getsockopt, | |
1825 | .sendmsg = packet_sendmsg, | |
1826 | .recvmsg = packet_recvmsg, | |
1827 | .mmap = packet_mmap, | |
1828 | .sendpage = sock_no_sendpage, | |
1829 | }; | |
1830 | ||
1831 | static struct net_proto_family packet_family_ops = { | |
1832 | .family = PF_PACKET, | |
1833 | .create = packet_create, | |
1834 | .owner = THIS_MODULE, | |
1835 | }; | |
1836 | ||
1837 | static struct notifier_block packet_netdev_notifier = { | |
1838 | .notifier_call =packet_notifier, | |
1839 | }; | |
1840 | ||
1841 | #ifdef CONFIG_PROC_FS | |
1842 | static inline struct sock *packet_seq_idx(loff_t off) | |
1843 | { | |
1844 | struct sock *s; | |
1845 | struct hlist_node *node; | |
1846 | ||
1847 | sk_for_each(s, node, &packet_sklist) { | |
1848 | if (!off--) | |
1849 | return s; | |
1850 | } | |
1851 | return NULL; | |
1852 | } | |
1853 | ||
1854 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
1855 | { | |
1856 | read_lock(&packet_sklist_lock); | |
1857 | return *pos ? packet_seq_idx(*pos - 1) : SEQ_START_TOKEN; | |
1858 | } | |
1859 | ||
1860 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1861 | { | |
1862 | ++*pos; | |
1863 | return (v == SEQ_START_TOKEN) | |
1864 | ? sk_head(&packet_sklist) | |
1865 | : sk_next((struct sock*)v) ; | |
1866 | } | |
1867 | ||
1868 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
1869 | { | |
1870 | read_unlock(&packet_sklist_lock); | |
1871 | } | |
1872 | ||
1873 | static int packet_seq_show(struct seq_file *seq, void *v) | |
1874 | { | |
1875 | if (v == SEQ_START_TOKEN) | |
1876 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
1877 | else { | |
1878 | struct sock *s = v; | |
1879 | const struct packet_sock *po = pkt_sk(s); | |
1880 | ||
1881 | seq_printf(seq, | |
1882 | "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", | |
1883 | s, | |
1884 | atomic_read(&s->sk_refcnt), | |
1885 | s->sk_type, | |
1886 | ntohs(po->num), | |
1887 | po->ifindex, | |
1888 | po->running, | |
1889 | atomic_read(&s->sk_rmem_alloc), | |
1890 | sock_i_uid(s), | |
1891 | sock_i_ino(s) ); | |
1892 | } | |
1893 | ||
1894 | return 0; | |
1895 | } | |
1896 | ||
1897 | static struct seq_operations packet_seq_ops = { | |
1898 | .start = packet_seq_start, | |
1899 | .next = packet_seq_next, | |
1900 | .stop = packet_seq_stop, | |
1901 | .show = packet_seq_show, | |
1902 | }; | |
1903 | ||
1904 | static int packet_seq_open(struct inode *inode, struct file *file) | |
1905 | { | |
1906 | return seq_open(file, &packet_seq_ops); | |
1907 | } | |
1908 | ||
1909 | static struct file_operations packet_seq_fops = { | |
1910 | .owner = THIS_MODULE, | |
1911 | .open = packet_seq_open, | |
1912 | .read = seq_read, | |
1913 | .llseek = seq_lseek, | |
1914 | .release = seq_release, | |
1915 | }; | |
1916 | ||
1917 | #endif | |
1918 | ||
1919 | static void __exit packet_exit(void) | |
1920 | { | |
1921 | proc_net_remove("packet"); | |
1922 | unregister_netdevice_notifier(&packet_netdev_notifier); | |
1923 | sock_unregister(PF_PACKET); | |
1924 | proto_unregister(&packet_proto); | |
1925 | } | |
1926 | ||
1927 | static int __init packet_init(void) | |
1928 | { | |
1929 | int rc = proto_register(&packet_proto, 0); | |
1930 | ||
1931 | if (rc != 0) | |
1932 | goto out; | |
1933 | ||
1934 | sock_register(&packet_family_ops); | |
1935 | register_netdevice_notifier(&packet_netdev_notifier); | |
1936 | proc_net_fops_create("packet", 0, &packet_seq_fops); | |
1937 | out: | |
1938 | return rc; | |
1939 | } | |
1940 | ||
1941 | module_init(packet_init); | |
1942 | module_exit(packet_exit); | |
1943 | MODULE_LICENSE("GPL"); | |
1944 | MODULE_ALIAS_NETPROTO(PF_PACKET); |