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. | |
39 | * | |
40 | * This program is free software; you can redistribute it and/or | |
41 | * modify it under the terms of the GNU General Public License | |
42 | * as published by the Free Software Foundation; either version | |
43 | * 2 of the License, or (at your option) any later version. | |
44 | * | |
45 | */ | |
46 | ||
47 | #include <linux/config.h> | |
48 | #include <linux/types.h> | |
49 | #include <linux/sched.h> | |
50 | #include <linux/mm.h> | |
51 | #include <linux/fcntl.h> | |
52 | #include <linux/socket.h> | |
53 | #include <linux/in.h> | |
54 | #include <linux/inet.h> | |
55 | #include <linux/netdevice.h> | |
56 | #include <linux/if_packet.h> | |
57 | #include <linux/wireless.h> | |
58 | #include <linux/kmod.h> | |
59 | #include <net/ip.h> | |
60 | #include <net/protocol.h> | |
61 | #include <linux/skbuff.h> | |
62 | #include <net/sock.h> | |
63 | #include <linux/errno.h> | |
64 | #include <linux/timer.h> | |
65 | #include <asm/system.h> | |
66 | #include <asm/uaccess.h> | |
67 | #include <asm/ioctls.h> | |
68 | #include <asm/page.h> | |
69 | #include <asm/io.h> | |
70 | #include <linux/proc_fs.h> | |
71 | #include <linux/seq_file.h> | |
72 | #include <linux/poll.h> | |
73 | #include <linux/module.h> | |
74 | #include <linux/init.h> | |
75 | ||
76 | #ifdef CONFIG_INET | |
77 | #include <net/inet_common.h> | |
78 | #endif | |
79 | ||
80 | #define CONFIG_SOCK_PACKET 1 | |
81 | ||
82 | /* | |
83 | Proposed replacement for SIOC{ADD,DEL}MULTI and | |
84 | IFF_PROMISC, IFF_ALLMULTI flags. | |
85 | ||
86 | It is more expensive, but I believe, | |
87 | it is really correct solution: reentereble, safe and fault tolerant. | |
88 | ||
89 | IFF_PROMISC/IFF_ALLMULTI/SIOC{ADD/DEL}MULTI are faked by keeping | |
90 | reference count and global flag, so that real status is | |
91 | (gflag|(count != 0)), so that we can use obsolete faulty interface | |
92 | not harming clever users. | |
93 | */ | |
94 | #define CONFIG_PACKET_MULTICAST 1 | |
95 | ||
96 | /* | |
97 | Assumptions: | |
98 | - if device has no dev->hard_header routine, it adds and removes ll header | |
99 | inside itself. In this case ll header is invisible outside of device, | |
100 | but higher levels still should reserve dev->hard_header_len. | |
101 | Some devices are enough clever to reallocate skb, when header | |
102 | will not fit to reserved space (tunnel), another ones are silly | |
103 | (PPP). | |
104 | - packet socket receives packets with pulled ll header, | |
105 | so that SOCK_RAW should push it back. | |
106 | ||
107 | On receive: | |
108 | ----------- | |
109 | ||
110 | Incoming, dev->hard_header!=NULL | |
111 | mac.raw -> ll header | |
112 | data -> data | |
113 | ||
114 | Outgoing, dev->hard_header!=NULL | |
115 | mac.raw -> ll header | |
116 | data -> ll header | |
117 | ||
118 | Incoming, dev->hard_header==NULL | |
119 | mac.raw -> UNKNOWN position. It is very likely, that it points to ll header. | |
120 | PPP makes it, that is wrong, because introduce assymetry | |
121 | between rx and tx paths. | |
122 | data -> data | |
123 | ||
124 | Outgoing, dev->hard_header==NULL | |
125 | mac.raw -> data. ll header is still not built! | |
126 | data -> data | |
127 | ||
128 | Resume | |
129 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. | |
130 | ||
131 | ||
132 | On transmit: | |
133 | ------------ | |
134 | ||
135 | dev->hard_header != NULL | |
136 | mac.raw -> ll header | |
137 | data -> ll header | |
138 | ||
139 | dev->hard_header == NULL (ll header is added by device, we cannot control it) | |
140 | mac.raw -> data | |
141 | data -> data | |
142 | ||
143 | We should set nh.raw on output to correct posistion, | |
144 | packet classifier depends on it. | |
145 | */ | |
146 | ||
147 | /* List of all packet sockets. */ | |
148 | static HLIST_HEAD(packet_sklist); | |
149 | static DEFINE_RWLOCK(packet_sklist_lock); | |
150 | ||
151 | static atomic_t packet_socks_nr; | |
152 | ||
153 | ||
154 | /* Private packet socket structures. */ | |
155 | ||
156 | #ifdef CONFIG_PACKET_MULTICAST | |
157 | struct packet_mclist | |
158 | { | |
159 | struct packet_mclist *next; | |
160 | int ifindex; | |
161 | int count; | |
162 | unsigned short type; | |
163 | unsigned short alen; | |
164 | unsigned char addr[8]; | |
165 | }; | |
166 | #endif | |
167 | #ifdef CONFIG_PACKET_MMAP | |
168 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing); | |
169 | #endif | |
170 | ||
171 | static void packet_flush_mclist(struct sock *sk); | |
172 | ||
173 | struct packet_sock { | |
174 | /* struct sock has to be the first member of packet_sock */ | |
175 | struct sock sk; | |
176 | struct tpacket_stats stats; | |
177 | #ifdef CONFIG_PACKET_MMAP | |
178 | char * *pg_vec; | |
179 | unsigned int head; | |
180 | unsigned int frames_per_block; | |
181 | unsigned int frame_size; | |
182 | unsigned int frame_max; | |
183 | int copy_thresh; | |
184 | #endif | |
185 | struct packet_type prot_hook; | |
186 | spinlock_t bind_lock; | |
187 | char running; /* prot_hook is attached*/ | |
188 | int ifindex; /* bound device */ | |
189 | unsigned short num; | |
190 | #ifdef CONFIG_PACKET_MULTICAST | |
191 | struct packet_mclist *mclist; | |
192 | #endif | |
193 | #ifdef CONFIG_PACKET_MMAP | |
194 | atomic_t mapped; | |
195 | unsigned int pg_vec_order; | |
196 | unsigned int pg_vec_pages; | |
197 | unsigned int pg_vec_len; | |
198 | #endif | |
199 | }; | |
200 | ||
201 | #ifdef CONFIG_PACKET_MMAP | |
202 | ||
203 | static inline char *packet_lookup_frame(struct packet_sock *po, unsigned int position) | |
204 | { | |
205 | unsigned int pg_vec_pos, frame_offset; | |
206 | char *frame; | |
207 | ||
208 | pg_vec_pos = position / po->frames_per_block; | |
209 | frame_offset = position % po->frames_per_block; | |
210 | ||
211 | frame = po->pg_vec[pg_vec_pos] + (frame_offset * po->frame_size); | |
212 | ||
213 | return frame; | |
214 | } | |
215 | #endif | |
216 | ||
217 | static inline struct packet_sock *pkt_sk(struct sock *sk) | |
218 | { | |
219 | return (struct packet_sock *)sk; | |
220 | } | |
221 | ||
222 | static void packet_sock_destruct(struct sock *sk) | |
223 | { | |
224 | BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); | |
225 | BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); | |
226 | ||
227 | if (!sock_flag(sk, SOCK_DEAD)) { | |
228 | printk("Attempt to release alive packet socket: %p\n", sk); | |
229 | return; | |
230 | } | |
231 | ||
232 | atomic_dec(&packet_socks_nr); | |
233 | #ifdef PACKET_REFCNT_DEBUG | |
234 | printk(KERN_DEBUG "PACKET socket %p is free, %d are alive\n", sk, atomic_read(&packet_socks_nr)); | |
235 | #endif | |
236 | } | |
237 | ||
238 | ||
239 | static struct proto_ops packet_ops; | |
240 | ||
241 | #ifdef CONFIG_SOCK_PACKET | |
242 | static struct proto_ops packet_ops_spkt; | |
243 | ||
f2ccd8fa | 244 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
245 | { |
246 | struct sock *sk; | |
247 | struct sockaddr_pkt *spkt; | |
248 | ||
249 | /* | |
250 | * When we registered the protocol we saved the socket in the data | |
251 | * field for just this event. | |
252 | */ | |
253 | ||
254 | sk = pt->af_packet_priv; | |
255 | ||
256 | /* | |
257 | * Yank back the headers [hope the device set this | |
258 | * right or kerboom...] | |
259 | * | |
260 | * Incoming packets have ll header pulled, | |
261 | * push it back. | |
262 | * | |
263 | * For outgoing ones skb->data == skb->mac.raw | |
264 | * so that this procedure is noop. | |
265 | */ | |
266 | ||
267 | if (skb->pkt_type == PACKET_LOOPBACK) | |
268 | goto out; | |
269 | ||
270 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
271 | goto oom; | |
272 | ||
273 | /* drop any routing info */ | |
274 | dst_release(skb->dst); | |
275 | skb->dst = NULL; | |
276 | ||
84531c24 PO |
277 | /* drop conntrack reference */ |
278 | nf_reset(skb); | |
279 | ||
1da177e4 LT |
280 | spkt = (struct sockaddr_pkt*)skb->cb; |
281 | ||
282 | skb_push(skb, skb->data-skb->mac.raw); | |
283 | ||
284 | /* | |
285 | * The SOCK_PACKET socket receives _all_ frames. | |
286 | */ | |
287 | ||
288 | spkt->spkt_family = dev->type; | |
289 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
290 | spkt->spkt_protocol = skb->protocol; | |
291 | ||
292 | /* | |
293 | * Charge the memory to the socket. This is done specifically | |
294 | * to prevent sockets using all the memory up. | |
295 | */ | |
296 | ||
297 | if (sock_queue_rcv_skb(sk,skb) == 0) | |
298 | return 0; | |
299 | ||
300 | out: | |
301 | kfree_skb(skb); | |
302 | oom: | |
303 | return 0; | |
304 | } | |
305 | ||
306 | ||
307 | /* | |
308 | * Output a raw packet to a device layer. This bypasses all the other | |
309 | * protocol layers and you must therefore supply it with a complete frame | |
310 | */ | |
311 | ||
312 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, | |
313 | struct msghdr *msg, size_t len) | |
314 | { | |
315 | struct sock *sk = sock->sk; | |
316 | struct sockaddr_pkt *saddr=(struct sockaddr_pkt *)msg->msg_name; | |
317 | struct sk_buff *skb; | |
318 | struct net_device *dev; | |
319 | unsigned short proto=0; | |
320 | int err; | |
321 | ||
322 | /* | |
323 | * Get and verify the address. | |
324 | */ | |
325 | ||
326 | if (saddr) | |
327 | { | |
328 | if (msg->msg_namelen < sizeof(struct sockaddr)) | |
329 | return(-EINVAL); | |
330 | if (msg->msg_namelen==sizeof(struct sockaddr_pkt)) | |
331 | proto=saddr->spkt_protocol; | |
332 | } | |
333 | else | |
334 | return(-ENOTCONN); /* SOCK_PACKET must be sent giving an address */ | |
335 | ||
336 | /* | |
337 | * Find the device first to size check it | |
338 | */ | |
339 | ||
340 | saddr->spkt_device[13] = 0; | |
341 | dev = dev_get_by_name(saddr->spkt_device); | |
342 | err = -ENODEV; | |
343 | if (dev == NULL) | |
344 | goto out_unlock; | |
345 | ||
346 | /* | |
347 | * You may not queue a frame bigger than the mtu. This is the lowest level | |
348 | * raw protocol and you must do your own fragmentation at this level. | |
349 | */ | |
350 | ||
351 | err = -EMSGSIZE; | |
352 | if(len>dev->mtu+dev->hard_header_len) | |
353 | goto out_unlock; | |
354 | ||
355 | err = -ENOBUFS; | |
356 | skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL); | |
357 | ||
358 | /* | |
359 | * If the write buffer is full, then tough. At this level the user gets to | |
360 | * deal with the problem - do your own algorithmic backoffs. That's far | |
361 | * more flexible. | |
362 | */ | |
363 | ||
364 | if (skb == NULL) | |
365 | goto out_unlock; | |
366 | ||
367 | /* | |
368 | * Fill it in | |
369 | */ | |
370 | ||
371 | /* FIXME: Save some space for broken drivers that write a | |
372 | * hard header at transmission time by themselves. PPP is the | |
373 | * notable one here. This should really be fixed at the driver level. | |
374 | */ | |
375 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
376 | skb->nh.raw = skb->data; | |
377 | ||
378 | /* Try to align data part correctly */ | |
379 | if (dev->hard_header) { | |
380 | skb->data -= dev->hard_header_len; | |
381 | skb->tail -= dev->hard_header_len; | |
382 | if (len < dev->hard_header_len) | |
383 | skb->nh.raw = skb->data; | |
384 | } | |
385 | ||
386 | /* Returns -EFAULT on error */ | |
387 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); | |
388 | skb->protocol = proto; | |
389 | skb->dev = dev; | |
390 | skb->priority = sk->sk_priority; | |
391 | if (err) | |
392 | goto out_free; | |
393 | ||
394 | err = -ENETDOWN; | |
395 | if (!(dev->flags & IFF_UP)) | |
396 | goto out_free; | |
397 | ||
398 | /* | |
399 | * Now send it | |
400 | */ | |
401 | ||
402 | dev_queue_xmit(skb); | |
403 | dev_put(dev); | |
404 | return(len); | |
405 | ||
406 | out_free: | |
407 | kfree_skb(skb); | |
408 | out_unlock: | |
409 | if (dev) | |
410 | dev_put(dev); | |
411 | return err; | |
412 | } | |
413 | #endif | |
414 | ||
415 | static inline unsigned run_filter(struct sk_buff *skb, struct sock *sk, unsigned res) | |
416 | { | |
417 | struct sk_filter *filter; | |
418 | ||
419 | bh_lock_sock(sk); | |
420 | filter = sk->sk_filter; | |
421 | /* | |
422 | * Our caller already checked that filter != NULL but we need to | |
423 | * verify that under bh_lock_sock() to be safe | |
424 | */ | |
425 | if (likely(filter != NULL)) | |
426 | res = sk_run_filter(skb, filter->insns, filter->len); | |
427 | bh_unlock_sock(sk); | |
428 | ||
429 | return res; | |
430 | } | |
431 | ||
432 | /* | |
433 | This function makes lazy skb cloning in hope that most of packets | |
434 | are discarded by BPF. | |
435 | ||
436 | Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
437 | and skb->cb are mangled. It works because (and until) packets | |
438 | falling here are owned by current CPU. Output packets are cloned | |
439 | by dev_queue_xmit_nit(), input packets are processed by net_bh | |
440 | sequencially, so that if we return skb to original state on exit, | |
441 | we will not harm anyone. | |
442 | */ | |
443 | ||
f2ccd8fa | 444 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
445 | { |
446 | struct sock *sk; | |
447 | struct sockaddr_ll *sll; | |
448 | struct packet_sock *po; | |
449 | u8 * skb_head = skb->data; | |
450 | int skb_len = skb->len; | |
451 | unsigned snaplen; | |
452 | ||
453 | if (skb->pkt_type == PACKET_LOOPBACK) | |
454 | goto drop; | |
455 | ||
456 | sk = pt->af_packet_priv; | |
457 | po = pkt_sk(sk); | |
458 | ||
459 | skb->dev = dev; | |
460 | ||
461 | if (dev->hard_header) { | |
462 | /* The device has an explicit notion of ll header, | |
463 | exported to higher levels. | |
464 | ||
465 | Otherwise, the device hides datails of it frame | |
466 | structure, so that corresponding packet head | |
467 | never delivered to user. | |
468 | */ | |
469 | if (sk->sk_type != SOCK_DGRAM) | |
470 | skb_push(skb, skb->data - skb->mac.raw); | |
471 | else if (skb->pkt_type == PACKET_OUTGOING) { | |
472 | /* Special case: outgoing packets have ll header at head */ | |
473 | skb_pull(skb, skb->nh.raw - skb->data); | |
474 | } | |
475 | } | |
476 | ||
477 | snaplen = skb->len; | |
478 | ||
479 | if (sk->sk_filter) { | |
480 | unsigned res = run_filter(skb, sk, snaplen); | |
481 | if (res == 0) | |
482 | goto drop_n_restore; | |
483 | if (snaplen > res) | |
484 | snaplen = res; | |
485 | } | |
486 | ||
487 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
488 | (unsigned)sk->sk_rcvbuf) | |
489 | goto drop_n_acct; | |
490 | ||
491 | if (skb_shared(skb)) { | |
492 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
493 | if (nskb == NULL) | |
494 | goto drop_n_acct; | |
495 | ||
496 | if (skb_head != skb->data) { | |
497 | skb->data = skb_head; | |
498 | skb->len = skb_len; | |
499 | } | |
500 | kfree_skb(skb); | |
501 | skb = nskb; | |
502 | } | |
503 | ||
504 | sll = (struct sockaddr_ll*)skb->cb; | |
505 | sll->sll_family = AF_PACKET; | |
506 | sll->sll_hatype = dev->type; | |
507 | sll->sll_protocol = skb->protocol; | |
508 | sll->sll_pkttype = skb->pkt_type; | |
509 | sll->sll_ifindex = dev->ifindex; | |
510 | sll->sll_halen = 0; | |
511 | ||
512 | if (dev->hard_header_parse) | |
513 | sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); | |
514 | ||
515 | if (pskb_trim(skb, snaplen)) | |
516 | goto drop_n_acct; | |
517 | ||
518 | skb_set_owner_r(skb, sk); | |
519 | skb->dev = NULL; | |
520 | dst_release(skb->dst); | |
521 | skb->dst = NULL; | |
522 | ||
84531c24 PO |
523 | /* drop conntrack reference */ |
524 | nf_reset(skb); | |
525 | ||
1da177e4 LT |
526 | spin_lock(&sk->sk_receive_queue.lock); |
527 | po->stats.tp_packets++; | |
528 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
529 | spin_unlock(&sk->sk_receive_queue.lock); | |
530 | sk->sk_data_ready(sk, skb->len); | |
531 | return 0; | |
532 | ||
533 | drop_n_acct: | |
534 | spin_lock(&sk->sk_receive_queue.lock); | |
535 | po->stats.tp_drops++; | |
536 | spin_unlock(&sk->sk_receive_queue.lock); | |
537 | ||
538 | drop_n_restore: | |
539 | if (skb_head != skb->data && skb_shared(skb)) { | |
540 | skb->data = skb_head; | |
541 | skb->len = skb_len; | |
542 | } | |
543 | drop: | |
544 | kfree_skb(skb); | |
545 | return 0; | |
546 | } | |
547 | ||
548 | #ifdef CONFIG_PACKET_MMAP | |
f2ccd8fa | 549 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
550 | { |
551 | struct sock *sk; | |
552 | struct packet_sock *po; | |
553 | struct sockaddr_ll *sll; | |
554 | struct tpacket_hdr *h; | |
555 | u8 * skb_head = skb->data; | |
556 | int skb_len = skb->len; | |
557 | unsigned snaplen; | |
558 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; | |
559 | unsigned short macoff, netoff; | |
560 | struct sk_buff *copy_skb = NULL; | |
561 | ||
562 | if (skb->pkt_type == PACKET_LOOPBACK) | |
563 | goto drop; | |
564 | ||
565 | sk = pt->af_packet_priv; | |
566 | po = pkt_sk(sk); | |
567 | ||
568 | if (dev->hard_header) { | |
569 | if (sk->sk_type != SOCK_DGRAM) | |
570 | skb_push(skb, skb->data - skb->mac.raw); | |
571 | else if (skb->pkt_type == PACKET_OUTGOING) { | |
572 | /* Special case: outgoing packets have ll header at head */ | |
573 | skb_pull(skb, skb->nh.raw - skb->data); | |
574 | if (skb->ip_summed == CHECKSUM_HW) | |
575 | status |= TP_STATUS_CSUMNOTREADY; | |
576 | } | |
577 | } | |
578 | ||
579 | snaplen = skb->len; | |
580 | ||
581 | if (sk->sk_filter) { | |
582 | unsigned res = run_filter(skb, sk, snaplen); | |
583 | if (res == 0) | |
584 | goto drop_n_restore; | |
585 | if (snaplen > res) | |
586 | snaplen = res; | |
587 | } | |
588 | ||
589 | if (sk->sk_type == SOCK_DGRAM) { | |
590 | macoff = netoff = TPACKET_ALIGN(TPACKET_HDRLEN) + 16; | |
591 | } else { | |
592 | unsigned maclen = skb->nh.raw - skb->data; | |
593 | netoff = TPACKET_ALIGN(TPACKET_HDRLEN + (maclen < 16 ? 16 : maclen)); | |
594 | macoff = netoff - maclen; | |
595 | } | |
596 | ||
597 | if (macoff + snaplen > po->frame_size) { | |
598 | if (po->copy_thresh && | |
599 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < | |
600 | (unsigned)sk->sk_rcvbuf) { | |
601 | if (skb_shared(skb)) { | |
602 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
603 | } else { | |
604 | copy_skb = skb_get(skb); | |
605 | skb_head = skb->data; | |
606 | } | |
607 | if (copy_skb) | |
608 | skb_set_owner_r(copy_skb, sk); | |
609 | } | |
610 | snaplen = po->frame_size - macoff; | |
611 | if ((int)snaplen < 0) | |
612 | snaplen = 0; | |
613 | } | |
614 | if (snaplen > skb->len-skb->data_len) | |
615 | snaplen = skb->len-skb->data_len; | |
616 | ||
617 | spin_lock(&sk->sk_receive_queue.lock); | |
618 | h = (struct tpacket_hdr *)packet_lookup_frame(po, po->head); | |
619 | ||
620 | if (h->tp_status) | |
621 | goto ring_is_full; | |
622 | po->head = po->head != po->frame_max ? po->head+1 : 0; | |
623 | po->stats.tp_packets++; | |
624 | if (copy_skb) { | |
625 | status |= TP_STATUS_COPY; | |
626 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
627 | } | |
628 | if (!po->stats.tp_drops) | |
629 | status &= ~TP_STATUS_LOSING; | |
630 | spin_unlock(&sk->sk_receive_queue.lock); | |
631 | ||
632 | memcpy((u8*)h + macoff, skb->data, snaplen); | |
633 | ||
634 | h->tp_len = skb->len; | |
635 | h->tp_snaplen = snaplen; | |
636 | h->tp_mac = macoff; | |
637 | h->tp_net = netoff; | |
a61bbcf2 PM |
638 | if (skb->tstamp.off_sec == 0) { |
639 | __net_timestamp(skb); | |
1da177e4 LT |
640 | sock_enable_timestamp(sk); |
641 | } | |
a61bbcf2 PM |
642 | h->tp_sec = skb_tv_base.tv_sec + skb->tstamp.off_sec; |
643 | h->tp_usec = skb_tv_base.tv_usec + skb->tstamp.off_usec; | |
1da177e4 LT |
644 | |
645 | sll = (struct sockaddr_ll*)((u8*)h + TPACKET_ALIGN(sizeof(*h))); | |
646 | sll->sll_halen = 0; | |
647 | if (dev->hard_header_parse) | |
648 | sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); | |
649 | sll->sll_family = AF_PACKET; | |
650 | sll->sll_hatype = dev->type; | |
651 | sll->sll_protocol = skb->protocol; | |
652 | sll->sll_pkttype = skb->pkt_type; | |
653 | sll->sll_ifindex = dev->ifindex; | |
654 | ||
655 | h->tp_status = status; | |
656 | mb(); | |
657 | ||
658 | { | |
659 | struct page *p_start, *p_end; | |
660 | u8 *h_end = (u8 *)h + macoff + snaplen - 1; | |
661 | ||
662 | p_start = virt_to_page(h); | |
663 | p_end = virt_to_page(h_end); | |
664 | while (p_start <= p_end) { | |
665 | flush_dcache_page(p_start); | |
666 | p_start++; | |
667 | } | |
668 | } | |
669 | ||
670 | sk->sk_data_ready(sk, 0); | |
671 | ||
672 | drop_n_restore: | |
673 | if (skb_head != skb->data && skb_shared(skb)) { | |
674 | skb->data = skb_head; | |
675 | skb->len = skb_len; | |
676 | } | |
677 | drop: | |
678 | kfree_skb(skb); | |
679 | return 0; | |
680 | ||
681 | ring_is_full: | |
682 | po->stats.tp_drops++; | |
683 | spin_unlock(&sk->sk_receive_queue.lock); | |
684 | ||
685 | sk->sk_data_ready(sk, 0); | |
686 | if (copy_skb) | |
687 | kfree_skb(copy_skb); | |
688 | goto drop_n_restore; | |
689 | } | |
690 | ||
691 | #endif | |
692 | ||
693 | ||
694 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, | |
695 | struct msghdr *msg, size_t len) | |
696 | { | |
697 | struct sock *sk = sock->sk; | |
698 | struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name; | |
699 | struct sk_buff *skb; | |
700 | struct net_device *dev; | |
701 | unsigned short proto; | |
702 | unsigned char *addr; | |
703 | int ifindex, err, reserve = 0; | |
704 | ||
705 | /* | |
706 | * Get and verify the address. | |
707 | */ | |
708 | ||
709 | if (saddr == NULL) { | |
710 | struct packet_sock *po = pkt_sk(sk); | |
711 | ||
712 | ifindex = po->ifindex; | |
713 | proto = po->num; | |
714 | addr = NULL; | |
715 | } else { | |
716 | err = -EINVAL; | |
717 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
718 | goto out; | |
719 | ifindex = saddr->sll_ifindex; | |
720 | proto = saddr->sll_protocol; | |
721 | addr = saddr->sll_addr; | |
722 | } | |
723 | ||
724 | ||
725 | dev = dev_get_by_index(ifindex); | |
726 | err = -ENXIO; | |
727 | if (dev == NULL) | |
728 | goto out_unlock; | |
729 | if (sock->type == SOCK_RAW) | |
730 | reserve = dev->hard_header_len; | |
731 | ||
732 | err = -EMSGSIZE; | |
733 | if (len > dev->mtu+reserve) | |
734 | goto out_unlock; | |
735 | ||
736 | skb = sock_alloc_send_skb(sk, len + LL_RESERVED_SPACE(dev), | |
737 | msg->msg_flags & MSG_DONTWAIT, &err); | |
738 | if (skb==NULL) | |
739 | goto out_unlock; | |
740 | ||
741 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
742 | skb->nh.raw = skb->data; | |
743 | ||
744 | if (dev->hard_header) { | |
745 | int res; | |
746 | err = -EINVAL; | |
747 | res = dev->hard_header(skb, dev, ntohs(proto), addr, NULL, len); | |
748 | if (sock->type != SOCK_DGRAM) { | |
749 | skb->tail = skb->data; | |
750 | skb->len = 0; | |
751 | } else if (res < 0) | |
752 | goto out_free; | |
753 | } | |
754 | ||
755 | /* Returns -EFAULT on error */ | |
756 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); | |
757 | if (err) | |
758 | goto out_free; | |
759 | ||
760 | skb->protocol = proto; | |
761 | skb->dev = dev; | |
762 | skb->priority = sk->sk_priority; | |
763 | ||
764 | err = -ENETDOWN; | |
765 | if (!(dev->flags & IFF_UP)) | |
766 | goto out_free; | |
767 | ||
768 | /* | |
769 | * Now send it | |
770 | */ | |
771 | ||
772 | err = dev_queue_xmit(skb); | |
773 | if (err > 0 && (err = net_xmit_errno(err)) != 0) | |
774 | goto out_unlock; | |
775 | ||
776 | dev_put(dev); | |
777 | ||
778 | return(len); | |
779 | ||
780 | out_free: | |
781 | kfree_skb(skb); | |
782 | out_unlock: | |
783 | if (dev) | |
784 | dev_put(dev); | |
785 | out: | |
786 | return err; | |
787 | } | |
788 | ||
789 | /* | |
790 | * Close a PACKET socket. This is fairly simple. We immediately go | |
791 | * to 'closed' state and remove our protocol entry in the device list. | |
792 | */ | |
793 | ||
794 | static int packet_release(struct socket *sock) | |
795 | { | |
796 | struct sock *sk = sock->sk; | |
797 | struct packet_sock *po; | |
798 | ||
799 | if (!sk) | |
800 | return 0; | |
801 | ||
802 | po = pkt_sk(sk); | |
803 | ||
804 | write_lock_bh(&packet_sklist_lock); | |
805 | sk_del_node_init(sk); | |
806 | write_unlock_bh(&packet_sklist_lock); | |
807 | ||
808 | /* | |
809 | * Unhook packet receive handler. | |
810 | */ | |
811 | ||
812 | if (po->running) { | |
813 | /* | |
814 | * Remove the protocol hook | |
815 | */ | |
816 | dev_remove_pack(&po->prot_hook); | |
817 | po->running = 0; | |
818 | po->num = 0; | |
819 | __sock_put(sk); | |
820 | } | |
821 | ||
822 | #ifdef CONFIG_PACKET_MULTICAST | |
823 | packet_flush_mclist(sk); | |
824 | #endif | |
825 | ||
826 | #ifdef CONFIG_PACKET_MMAP | |
827 | if (po->pg_vec) { | |
828 | struct tpacket_req req; | |
829 | memset(&req, 0, sizeof(req)); | |
830 | packet_set_ring(sk, &req, 1); | |
831 | } | |
832 | #endif | |
833 | ||
834 | /* | |
835 | * Now the socket is dead. No more input will appear. | |
836 | */ | |
837 | ||
838 | sock_orphan(sk); | |
839 | sock->sk = NULL; | |
840 | ||
841 | /* Purge queues */ | |
842 | ||
843 | skb_queue_purge(&sk->sk_receive_queue); | |
844 | ||
845 | sock_put(sk); | |
846 | return 0; | |
847 | } | |
848 | ||
849 | /* | |
850 | * Attach a packet hook. | |
851 | */ | |
852 | ||
853 | static int packet_do_bind(struct sock *sk, struct net_device *dev, int protocol) | |
854 | { | |
855 | struct packet_sock *po = pkt_sk(sk); | |
856 | /* | |
857 | * Detach an existing hook if present. | |
858 | */ | |
859 | ||
860 | lock_sock(sk); | |
861 | ||
862 | spin_lock(&po->bind_lock); | |
863 | if (po->running) { | |
864 | __sock_put(sk); | |
865 | po->running = 0; | |
866 | po->num = 0; | |
867 | spin_unlock(&po->bind_lock); | |
868 | dev_remove_pack(&po->prot_hook); | |
869 | spin_lock(&po->bind_lock); | |
870 | } | |
871 | ||
872 | po->num = protocol; | |
873 | po->prot_hook.type = protocol; | |
874 | po->prot_hook.dev = dev; | |
875 | ||
876 | po->ifindex = dev ? dev->ifindex : 0; | |
877 | ||
878 | if (protocol == 0) | |
879 | goto out_unlock; | |
880 | ||
881 | if (dev) { | |
882 | if (dev->flags&IFF_UP) { | |
883 | dev_add_pack(&po->prot_hook); | |
884 | sock_hold(sk); | |
885 | po->running = 1; | |
886 | } else { | |
887 | sk->sk_err = ENETDOWN; | |
888 | if (!sock_flag(sk, SOCK_DEAD)) | |
889 | sk->sk_error_report(sk); | |
890 | } | |
891 | } else { | |
892 | dev_add_pack(&po->prot_hook); | |
893 | sock_hold(sk); | |
894 | po->running = 1; | |
895 | } | |
896 | ||
897 | out_unlock: | |
898 | spin_unlock(&po->bind_lock); | |
899 | release_sock(sk); | |
900 | return 0; | |
901 | } | |
902 | ||
903 | /* | |
904 | * Bind a packet socket to a device | |
905 | */ | |
906 | ||
907 | #ifdef CONFIG_SOCK_PACKET | |
908 | ||
909 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
910 | { | |
911 | struct sock *sk=sock->sk; | |
912 | char name[15]; | |
913 | struct net_device *dev; | |
914 | int err = -ENODEV; | |
915 | ||
916 | /* | |
917 | * Check legality | |
918 | */ | |
919 | ||
920 | if(addr_len!=sizeof(struct sockaddr)) | |
921 | return -EINVAL; | |
922 | strlcpy(name,uaddr->sa_data,sizeof(name)); | |
923 | ||
924 | dev = dev_get_by_name(name); | |
925 | if (dev) { | |
926 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); | |
927 | dev_put(dev); | |
928 | } | |
929 | return err; | |
930 | } | |
931 | #endif | |
932 | ||
933 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
934 | { | |
935 | struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; | |
936 | struct sock *sk=sock->sk; | |
937 | struct net_device *dev = NULL; | |
938 | int err; | |
939 | ||
940 | ||
941 | /* | |
942 | * Check legality | |
943 | */ | |
944 | ||
945 | if (addr_len < sizeof(struct sockaddr_ll)) | |
946 | return -EINVAL; | |
947 | if (sll->sll_family != AF_PACKET) | |
948 | return -EINVAL; | |
949 | ||
950 | if (sll->sll_ifindex) { | |
951 | err = -ENODEV; | |
952 | dev = dev_get_by_index(sll->sll_ifindex); | |
953 | if (dev == NULL) | |
954 | goto out; | |
955 | } | |
956 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
957 | if (dev) | |
958 | dev_put(dev); | |
959 | ||
960 | out: | |
961 | return err; | |
962 | } | |
963 | ||
964 | static struct proto packet_proto = { | |
965 | .name = "PACKET", | |
966 | .owner = THIS_MODULE, | |
967 | .obj_size = sizeof(struct packet_sock), | |
968 | }; | |
969 | ||
970 | /* | |
971 | * Create a packet of type SOCK_PACKET. | |
972 | */ | |
973 | ||
974 | static int packet_create(struct socket *sock, int protocol) | |
975 | { | |
976 | struct sock *sk; | |
977 | struct packet_sock *po; | |
978 | int err; | |
979 | ||
980 | if (!capable(CAP_NET_RAW)) | |
981 | return -EPERM; | |
982 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW | |
983 | #ifdef CONFIG_SOCK_PACKET | |
984 | && sock->type != SOCK_PACKET | |
985 | #endif | |
986 | ) | |
987 | return -ESOCKTNOSUPPORT; | |
988 | ||
989 | sock->state = SS_UNCONNECTED; | |
990 | ||
991 | err = -ENOBUFS; | |
992 | sk = sk_alloc(PF_PACKET, GFP_KERNEL, &packet_proto, 1); | |
993 | if (sk == NULL) | |
994 | goto out; | |
995 | ||
996 | sock->ops = &packet_ops; | |
997 | #ifdef CONFIG_SOCK_PACKET | |
998 | if (sock->type == SOCK_PACKET) | |
999 | sock->ops = &packet_ops_spkt; | |
1000 | #endif | |
1001 | sock_init_data(sock, sk); | |
1002 | ||
1003 | po = pkt_sk(sk); | |
1004 | sk->sk_family = PF_PACKET; | |
1005 | po->num = protocol; | |
1006 | ||
1007 | sk->sk_destruct = packet_sock_destruct; | |
1008 | atomic_inc(&packet_socks_nr); | |
1009 | ||
1010 | /* | |
1011 | * Attach a protocol block | |
1012 | */ | |
1013 | ||
1014 | spin_lock_init(&po->bind_lock); | |
1015 | po->prot_hook.func = packet_rcv; | |
1016 | #ifdef CONFIG_SOCK_PACKET | |
1017 | if (sock->type == SOCK_PACKET) | |
1018 | po->prot_hook.func = packet_rcv_spkt; | |
1019 | #endif | |
1020 | po->prot_hook.af_packet_priv = sk; | |
1021 | ||
1022 | if (protocol) { | |
1023 | po->prot_hook.type = protocol; | |
1024 | dev_add_pack(&po->prot_hook); | |
1025 | sock_hold(sk); | |
1026 | po->running = 1; | |
1027 | } | |
1028 | ||
1029 | write_lock_bh(&packet_sklist_lock); | |
1030 | sk_add_node(sk, &packet_sklist); | |
1031 | write_unlock_bh(&packet_sklist_lock); | |
1032 | return(0); | |
1033 | out: | |
1034 | return err; | |
1035 | } | |
1036 | ||
1037 | /* | |
1038 | * Pull a packet from our receive queue and hand it to the user. | |
1039 | * If necessary we block. | |
1040 | */ | |
1041 | ||
1042 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1043 | struct msghdr *msg, size_t len, int flags) | |
1044 | { | |
1045 | struct sock *sk = sock->sk; | |
1046 | struct sk_buff *skb; | |
1047 | int copied, err; | |
1048 | ||
1049 | err = -EINVAL; | |
1050 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) | |
1051 | goto out; | |
1052 | ||
1053 | #if 0 | |
1054 | /* What error should we return now? EUNATTACH? */ | |
1055 | if (pkt_sk(sk)->ifindex < 0) | |
1056 | return -ENODEV; | |
1057 | #endif | |
1058 | ||
1059 | /* | |
1060 | * If the address length field is there to be filled in, we fill | |
1061 | * it in now. | |
1062 | */ | |
1063 | ||
1064 | if (sock->type == SOCK_PACKET) | |
1065 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
1066 | else | |
1067 | msg->msg_namelen = sizeof(struct sockaddr_ll); | |
1068 | ||
1069 | /* | |
1070 | * Call the generic datagram receiver. This handles all sorts | |
1071 | * of horrible races and re-entrancy so we can forget about it | |
1072 | * in the protocol layers. | |
1073 | * | |
1074 | * Now it will return ENETDOWN, if device have just gone down, | |
1075 | * but then it will block. | |
1076 | */ | |
1077 | ||
1078 | skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&err); | |
1079 | ||
1080 | /* | |
1081 | * An error occurred so return it. Because skb_recv_datagram() | |
1082 | * handles the blocking we don't see and worry about blocking | |
1083 | * retries. | |
1084 | */ | |
1085 | ||
1086 | if(skb==NULL) | |
1087 | goto out; | |
1088 | ||
1089 | /* | |
1090 | * You lose any data beyond the buffer you gave. If it worries a | |
1091 | * user program they can ask the device for its MTU anyway. | |
1092 | */ | |
1093 | ||
1094 | copied = skb->len; | |
1095 | if (copied > len) | |
1096 | { | |
1097 | copied=len; | |
1098 | msg->msg_flags|=MSG_TRUNC; | |
1099 | } | |
1100 | ||
1101 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1102 | if (err) | |
1103 | goto out_free; | |
1104 | ||
1105 | sock_recv_timestamp(msg, sk, skb); | |
1106 | ||
1107 | if (msg->msg_name) | |
1108 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
1109 | ||
1110 | /* | |
1111 | * Free or return the buffer as appropriate. Again this | |
1112 | * hides all the races and re-entrancy issues from us. | |
1113 | */ | |
1114 | err = (flags&MSG_TRUNC) ? skb->len : copied; | |
1115 | ||
1116 | out_free: | |
1117 | skb_free_datagram(sk, skb); | |
1118 | out: | |
1119 | return err; | |
1120 | } | |
1121 | ||
1122 | #ifdef CONFIG_SOCK_PACKET | |
1123 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, | |
1124 | int *uaddr_len, int peer) | |
1125 | { | |
1126 | struct net_device *dev; | |
1127 | struct sock *sk = sock->sk; | |
1128 | ||
1129 | if (peer) | |
1130 | return -EOPNOTSUPP; | |
1131 | ||
1132 | uaddr->sa_family = AF_PACKET; | |
1133 | dev = dev_get_by_index(pkt_sk(sk)->ifindex); | |
1134 | if (dev) { | |
1135 | strlcpy(uaddr->sa_data, dev->name, 15); | |
1136 | dev_put(dev); | |
1137 | } else | |
1138 | memset(uaddr->sa_data, 0, 14); | |
1139 | *uaddr_len = sizeof(*uaddr); | |
1140 | ||
1141 | return 0; | |
1142 | } | |
1143 | #endif | |
1144 | ||
1145 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
1146 | int *uaddr_len, int peer) | |
1147 | { | |
1148 | struct net_device *dev; | |
1149 | struct sock *sk = sock->sk; | |
1150 | struct packet_sock *po = pkt_sk(sk); | |
1151 | struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; | |
1152 | ||
1153 | if (peer) | |
1154 | return -EOPNOTSUPP; | |
1155 | ||
1156 | sll->sll_family = AF_PACKET; | |
1157 | sll->sll_ifindex = po->ifindex; | |
1158 | sll->sll_protocol = po->num; | |
1159 | dev = dev_get_by_index(po->ifindex); | |
1160 | if (dev) { | |
1161 | sll->sll_hatype = dev->type; | |
1162 | sll->sll_halen = dev->addr_len; | |
1163 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1164 | dev_put(dev); | |
1165 | } else { | |
1166 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
1167 | sll->sll_halen = 0; | |
1168 | } | |
1169 | *uaddr_len = sizeof(*sll); | |
1170 | ||
1171 | return 0; | |
1172 | } | |
1173 | ||
1174 | #ifdef CONFIG_PACKET_MULTICAST | |
1175 | static void packet_dev_mc(struct net_device *dev, struct packet_mclist *i, int what) | |
1176 | { | |
1177 | switch (i->type) { | |
1178 | case PACKET_MR_MULTICAST: | |
1179 | if (what > 0) | |
1180 | dev_mc_add(dev, i->addr, i->alen, 0); | |
1181 | else | |
1182 | dev_mc_delete(dev, i->addr, i->alen, 0); | |
1183 | break; | |
1184 | case PACKET_MR_PROMISC: | |
1185 | dev_set_promiscuity(dev, what); | |
1186 | break; | |
1187 | case PACKET_MR_ALLMULTI: | |
1188 | dev_set_allmulti(dev, what); | |
1189 | break; | |
1190 | default:; | |
1191 | } | |
1192 | } | |
1193 | ||
1194 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
1195 | { | |
1196 | for ( ; i; i=i->next) { | |
1197 | if (i->ifindex == dev->ifindex) | |
1198 | packet_dev_mc(dev, i, what); | |
1199 | } | |
1200 | } | |
1201 | ||
1202 | static int packet_mc_add(struct sock *sk, struct packet_mreq *mreq) | |
1203 | { | |
1204 | struct packet_sock *po = pkt_sk(sk); | |
1205 | struct packet_mclist *ml, *i; | |
1206 | struct net_device *dev; | |
1207 | int err; | |
1208 | ||
1209 | rtnl_lock(); | |
1210 | ||
1211 | err = -ENODEV; | |
1212 | dev = __dev_get_by_index(mreq->mr_ifindex); | |
1213 | if (!dev) | |
1214 | goto done; | |
1215 | ||
1216 | err = -EINVAL; | |
1217 | if (mreq->mr_alen > dev->addr_len) | |
1218 | goto done; | |
1219 | ||
1220 | err = -ENOBUFS; | |
1221 | i = (struct packet_mclist *)kmalloc(sizeof(*i), GFP_KERNEL); | |
1222 | if (i == NULL) | |
1223 | goto done; | |
1224 | ||
1225 | err = 0; | |
1226 | for (ml = po->mclist; ml; ml = ml->next) { | |
1227 | if (ml->ifindex == mreq->mr_ifindex && | |
1228 | ml->type == mreq->mr_type && | |
1229 | ml->alen == mreq->mr_alen && | |
1230 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1231 | ml->count++; | |
1232 | /* Free the new element ... */ | |
1233 | kfree(i); | |
1234 | goto done; | |
1235 | } | |
1236 | } | |
1237 | ||
1238 | i->type = mreq->mr_type; | |
1239 | i->ifindex = mreq->mr_ifindex; | |
1240 | i->alen = mreq->mr_alen; | |
1241 | memcpy(i->addr, mreq->mr_address, i->alen); | |
1242 | i->count = 1; | |
1243 | i->next = po->mclist; | |
1244 | po->mclist = i; | |
1245 | packet_dev_mc(dev, i, +1); | |
1246 | ||
1247 | done: | |
1248 | rtnl_unlock(); | |
1249 | return err; | |
1250 | } | |
1251 | ||
1252 | static int packet_mc_drop(struct sock *sk, struct packet_mreq *mreq) | |
1253 | { | |
1254 | struct packet_mclist *ml, **mlp; | |
1255 | ||
1256 | rtnl_lock(); | |
1257 | ||
1258 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
1259 | if (ml->ifindex == mreq->mr_ifindex && | |
1260 | ml->type == mreq->mr_type && | |
1261 | ml->alen == mreq->mr_alen && | |
1262 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1263 | if (--ml->count == 0) { | |
1264 | struct net_device *dev; | |
1265 | *mlp = ml->next; | |
1266 | dev = dev_get_by_index(ml->ifindex); | |
1267 | if (dev) { | |
1268 | packet_dev_mc(dev, ml, -1); | |
1269 | dev_put(dev); | |
1270 | } | |
1271 | kfree(ml); | |
1272 | } | |
1273 | rtnl_unlock(); | |
1274 | return 0; | |
1275 | } | |
1276 | } | |
1277 | rtnl_unlock(); | |
1278 | return -EADDRNOTAVAIL; | |
1279 | } | |
1280 | ||
1281 | static void packet_flush_mclist(struct sock *sk) | |
1282 | { | |
1283 | struct packet_sock *po = pkt_sk(sk); | |
1284 | struct packet_mclist *ml; | |
1285 | ||
1286 | if (!po->mclist) | |
1287 | return; | |
1288 | ||
1289 | rtnl_lock(); | |
1290 | while ((ml = po->mclist) != NULL) { | |
1291 | struct net_device *dev; | |
1292 | ||
1293 | po->mclist = ml->next; | |
1294 | if ((dev = dev_get_by_index(ml->ifindex)) != NULL) { | |
1295 | packet_dev_mc(dev, ml, -1); | |
1296 | dev_put(dev); | |
1297 | } | |
1298 | kfree(ml); | |
1299 | } | |
1300 | rtnl_unlock(); | |
1301 | } | |
1302 | #endif | |
1303 | ||
1304 | static int | |
1305 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) | |
1306 | { | |
1307 | struct sock *sk = sock->sk; | |
1308 | int ret; | |
1309 | ||
1310 | if (level != SOL_PACKET) | |
1311 | return -ENOPROTOOPT; | |
1312 | ||
1313 | switch(optname) { | |
1314 | #ifdef CONFIG_PACKET_MULTICAST | |
1315 | case PACKET_ADD_MEMBERSHIP: | |
1316 | case PACKET_DROP_MEMBERSHIP: | |
1317 | { | |
1318 | struct packet_mreq mreq; | |
1319 | if (optlen<sizeof(mreq)) | |
1320 | return -EINVAL; | |
1321 | if (copy_from_user(&mreq,optval,sizeof(mreq))) | |
1322 | return -EFAULT; | |
1323 | if (optname == PACKET_ADD_MEMBERSHIP) | |
1324 | ret = packet_mc_add(sk, &mreq); | |
1325 | else | |
1326 | ret = packet_mc_drop(sk, &mreq); | |
1327 | return ret; | |
1328 | } | |
1329 | #endif | |
1330 | #ifdef CONFIG_PACKET_MMAP | |
1331 | case PACKET_RX_RING: | |
1332 | { | |
1333 | struct tpacket_req req; | |
1334 | ||
1335 | if (optlen<sizeof(req)) | |
1336 | return -EINVAL; | |
1337 | if (copy_from_user(&req,optval,sizeof(req))) | |
1338 | return -EFAULT; | |
1339 | return packet_set_ring(sk, &req, 0); | |
1340 | } | |
1341 | case PACKET_COPY_THRESH: | |
1342 | { | |
1343 | int val; | |
1344 | ||
1345 | if (optlen!=sizeof(val)) | |
1346 | return -EINVAL; | |
1347 | if (copy_from_user(&val,optval,sizeof(val))) | |
1348 | return -EFAULT; | |
1349 | ||
1350 | pkt_sk(sk)->copy_thresh = val; | |
1351 | return 0; | |
1352 | } | |
1353 | #endif | |
1354 | default: | |
1355 | return -ENOPROTOOPT; | |
1356 | } | |
1357 | } | |
1358 | ||
1359 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
1360 | char __user *optval, int __user *optlen) | |
1361 | { | |
1362 | int len; | |
1363 | struct sock *sk = sock->sk; | |
1364 | struct packet_sock *po = pkt_sk(sk); | |
1365 | ||
1366 | if (level != SOL_PACKET) | |
1367 | return -ENOPROTOOPT; | |
1368 | ||
1369 | if (get_user(len,optlen)) | |
1370 | return -EFAULT; | |
1371 | ||
1372 | if (len < 0) | |
1373 | return -EINVAL; | |
1374 | ||
1375 | switch(optname) { | |
1376 | case PACKET_STATISTICS: | |
1377 | { | |
1378 | struct tpacket_stats st; | |
1379 | ||
1380 | if (len > sizeof(struct tpacket_stats)) | |
1381 | len = sizeof(struct tpacket_stats); | |
1382 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1383 | st = po->stats; | |
1384 | memset(&po->stats, 0, sizeof(st)); | |
1385 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1386 | st.tp_packets += st.tp_drops; | |
1387 | ||
1388 | if (copy_to_user(optval, &st, len)) | |
1389 | return -EFAULT; | |
1390 | break; | |
1391 | } | |
1392 | default: | |
1393 | return -ENOPROTOOPT; | |
1394 | } | |
1395 | ||
1396 | if (put_user(len, optlen)) | |
1397 | return -EFAULT; | |
1398 | return 0; | |
1399 | } | |
1400 | ||
1401 | ||
1402 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) | |
1403 | { | |
1404 | struct sock *sk; | |
1405 | struct hlist_node *node; | |
1406 | struct net_device *dev = (struct net_device*)data; | |
1407 | ||
1408 | read_lock(&packet_sklist_lock); | |
1409 | sk_for_each(sk, node, &packet_sklist) { | |
1410 | struct packet_sock *po = pkt_sk(sk); | |
1411 | ||
1412 | switch (msg) { | |
1413 | case NETDEV_UNREGISTER: | |
1414 | #ifdef CONFIG_PACKET_MULTICAST | |
1415 | if (po->mclist) | |
1416 | packet_dev_mclist(dev, po->mclist, -1); | |
1417 | // fallthrough | |
1418 | #endif | |
1419 | case NETDEV_DOWN: | |
1420 | if (dev->ifindex == po->ifindex) { | |
1421 | spin_lock(&po->bind_lock); | |
1422 | if (po->running) { | |
1423 | __dev_remove_pack(&po->prot_hook); | |
1424 | __sock_put(sk); | |
1425 | po->running = 0; | |
1426 | sk->sk_err = ENETDOWN; | |
1427 | if (!sock_flag(sk, SOCK_DEAD)) | |
1428 | sk->sk_error_report(sk); | |
1429 | } | |
1430 | if (msg == NETDEV_UNREGISTER) { | |
1431 | po->ifindex = -1; | |
1432 | po->prot_hook.dev = NULL; | |
1433 | } | |
1434 | spin_unlock(&po->bind_lock); | |
1435 | } | |
1436 | break; | |
1437 | case NETDEV_UP: | |
1438 | spin_lock(&po->bind_lock); | |
1439 | if (dev->ifindex == po->ifindex && po->num && | |
1440 | !po->running) { | |
1441 | dev_add_pack(&po->prot_hook); | |
1442 | sock_hold(sk); | |
1443 | po->running = 1; | |
1444 | } | |
1445 | spin_unlock(&po->bind_lock); | |
1446 | break; | |
1447 | } | |
1448 | } | |
1449 | read_unlock(&packet_sklist_lock); | |
1450 | return NOTIFY_DONE; | |
1451 | } | |
1452 | ||
1453 | ||
1454 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
1455 | unsigned long arg) | |
1456 | { | |
1457 | struct sock *sk = sock->sk; | |
1458 | ||
1459 | switch(cmd) { | |
1460 | case SIOCOUTQ: | |
1461 | { | |
1462 | int amount = atomic_read(&sk->sk_wmem_alloc); | |
1463 | return put_user(amount, (int __user *)arg); | |
1464 | } | |
1465 | case SIOCINQ: | |
1466 | { | |
1467 | struct sk_buff *skb; | |
1468 | int amount = 0; | |
1469 | ||
1470 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1471 | skb = skb_peek(&sk->sk_receive_queue); | |
1472 | if (skb) | |
1473 | amount = skb->len; | |
1474 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1475 | return put_user(amount, (int __user *)arg); | |
1476 | } | |
1477 | case SIOCGSTAMP: | |
1478 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
1479 | ||
1480 | #ifdef CONFIG_INET | |
1481 | case SIOCADDRT: | |
1482 | case SIOCDELRT: | |
1483 | case SIOCDARP: | |
1484 | case SIOCGARP: | |
1485 | case SIOCSARP: | |
1486 | case SIOCGIFADDR: | |
1487 | case SIOCSIFADDR: | |
1488 | case SIOCGIFBRDADDR: | |
1489 | case SIOCSIFBRDADDR: | |
1490 | case SIOCGIFNETMASK: | |
1491 | case SIOCSIFNETMASK: | |
1492 | case SIOCGIFDSTADDR: | |
1493 | case SIOCSIFDSTADDR: | |
1494 | case SIOCSIFFLAGS: | |
1495 | return inet_dgram_ops.ioctl(sock, cmd, arg); | |
1496 | #endif | |
1497 | ||
1498 | default: | |
1499 | return dev_ioctl(cmd, (void __user *)arg); | |
1500 | } | |
1501 | return 0; | |
1502 | } | |
1503 | ||
1504 | #ifndef CONFIG_PACKET_MMAP | |
1505 | #define packet_mmap sock_no_mmap | |
1506 | #define packet_poll datagram_poll | |
1507 | #else | |
1508 | ||
1509 | static unsigned int packet_poll(struct file * file, struct socket *sock, | |
1510 | poll_table *wait) | |
1511 | { | |
1512 | struct sock *sk = sock->sk; | |
1513 | struct packet_sock *po = pkt_sk(sk); | |
1514 | unsigned int mask = datagram_poll(file, sock, wait); | |
1515 | ||
1516 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1517 | if (po->pg_vec) { | |
1518 | unsigned last = po->head ? po->head-1 : po->frame_max; | |
1519 | struct tpacket_hdr *h; | |
1520 | ||
1521 | h = (struct tpacket_hdr *)packet_lookup_frame(po, last); | |
1522 | ||
1523 | if (h->tp_status) | |
1524 | mask |= POLLIN | POLLRDNORM; | |
1525 | } | |
1526 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1527 | return mask; | |
1528 | } | |
1529 | ||
1530 | ||
1531 | /* Dirty? Well, I still did not learn better way to account | |
1532 | * for user mmaps. | |
1533 | */ | |
1534 | ||
1535 | static void packet_mm_open(struct vm_area_struct *vma) | |
1536 | { | |
1537 | struct file *file = vma->vm_file; | |
1538 | struct inode *inode = file->f_dentry->d_inode; | |
1539 | struct socket * sock = SOCKET_I(inode); | |
1540 | struct sock *sk = sock->sk; | |
1541 | ||
1542 | if (sk) | |
1543 | atomic_inc(&pkt_sk(sk)->mapped); | |
1544 | } | |
1545 | ||
1546 | static void packet_mm_close(struct vm_area_struct *vma) | |
1547 | { | |
1548 | struct file *file = vma->vm_file; | |
1549 | struct inode *inode = file->f_dentry->d_inode; | |
1550 | struct socket * sock = SOCKET_I(inode); | |
1551 | struct sock *sk = sock->sk; | |
1552 | ||
1553 | if (sk) | |
1554 | atomic_dec(&pkt_sk(sk)->mapped); | |
1555 | } | |
1556 | ||
1557 | static struct vm_operations_struct packet_mmap_ops = { | |
1558 | .open = packet_mm_open, | |
1559 | .close =packet_mm_close, | |
1560 | }; | |
1561 | ||
1562 | static inline struct page *pg_vec_endpage(char *one_pg_vec, unsigned int order) | |
1563 | { | |
1564 | return virt_to_page(one_pg_vec + (PAGE_SIZE << order) - 1); | |
1565 | } | |
1566 | ||
1567 | static void free_pg_vec(char **pg_vec, unsigned order, unsigned len) | |
1568 | { | |
1569 | int i; | |
1570 | ||
1571 | for (i=0; i<len; i++) { | |
1572 | if (pg_vec[i]) { | |
1573 | struct page *page, *pend; | |
1574 | ||
1575 | pend = pg_vec_endpage(pg_vec[i], order); | |
1576 | for (page = virt_to_page(pg_vec[i]); page <= pend; page++) | |
1577 | ClearPageReserved(page); | |
1578 | free_pages((unsigned long)pg_vec[i], order); | |
1579 | } | |
1580 | } | |
1581 | kfree(pg_vec); | |
1582 | } | |
1583 | ||
1584 | ||
1585 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing) | |
1586 | { | |
1587 | char **pg_vec = NULL; | |
1588 | struct packet_sock *po = pkt_sk(sk); | |
1589 | int was_running, num, order = 0; | |
1590 | int err = 0; | |
1591 | ||
1592 | if (req->tp_block_nr) { | |
1593 | int i, l; | |
1594 | ||
1595 | /* Sanity tests and some calculations */ | |
1596 | ||
1597 | if (po->pg_vec) | |
1598 | return -EBUSY; | |
1599 | ||
1600 | if ((int)req->tp_block_size <= 0) | |
1601 | return -EINVAL; | |
1602 | if (req->tp_block_size&(PAGE_SIZE-1)) | |
1603 | return -EINVAL; | |
1604 | if (req->tp_frame_size < TPACKET_HDRLEN) | |
1605 | return -EINVAL; | |
1606 | if (req->tp_frame_size&(TPACKET_ALIGNMENT-1)) | |
1607 | return -EINVAL; | |
1608 | ||
1609 | po->frames_per_block = req->tp_block_size/req->tp_frame_size; | |
1610 | if (po->frames_per_block <= 0) | |
1611 | return -EINVAL; | |
1612 | if (po->frames_per_block*req->tp_block_nr != req->tp_frame_nr) | |
1613 | return -EINVAL; | |
1614 | /* OK! */ | |
1615 | ||
1616 | /* Allocate page vector */ | |
1617 | while ((PAGE_SIZE<<order) < req->tp_block_size) | |
1618 | order++; | |
1619 | ||
1620 | err = -ENOMEM; | |
1621 | ||
1622 | pg_vec = kmalloc(req->tp_block_nr*sizeof(char *), GFP_KERNEL); | |
1623 | if (pg_vec == NULL) | |
1624 | goto out; | |
1625 | memset(pg_vec, 0, req->tp_block_nr*sizeof(char **)); | |
1626 | ||
1627 | for (i=0; i<req->tp_block_nr; i++) { | |
1628 | struct page *page, *pend; | |
1629 | pg_vec[i] = (char *)__get_free_pages(GFP_KERNEL, order); | |
1630 | if (!pg_vec[i]) | |
1631 | goto out_free_pgvec; | |
1632 | ||
1633 | pend = pg_vec_endpage(pg_vec[i], order); | |
1634 | for (page = virt_to_page(pg_vec[i]); page <= pend; page++) | |
1635 | SetPageReserved(page); | |
1636 | } | |
1637 | /* Page vector is allocated */ | |
1638 | ||
1639 | l = 0; | |
1640 | for (i=0; i<req->tp_block_nr; i++) { | |
1641 | char *ptr = pg_vec[i]; | |
1642 | struct tpacket_hdr *header; | |
1643 | int k; | |
1644 | ||
1645 | for (k=0; k<po->frames_per_block; k++) { | |
1646 | ||
1647 | header = (struct tpacket_hdr*)ptr; | |
1648 | header->tp_status = TP_STATUS_KERNEL; | |
1649 | ptr += req->tp_frame_size; | |
1650 | } | |
1651 | } | |
1652 | /* Done */ | |
1653 | } else { | |
1654 | if (req->tp_frame_nr) | |
1655 | return -EINVAL; | |
1656 | } | |
1657 | ||
1658 | lock_sock(sk); | |
1659 | ||
1660 | /* Detach socket from network */ | |
1661 | spin_lock(&po->bind_lock); | |
1662 | was_running = po->running; | |
1663 | num = po->num; | |
1664 | if (was_running) { | |
1665 | __dev_remove_pack(&po->prot_hook); | |
1666 | po->num = 0; | |
1667 | po->running = 0; | |
1668 | __sock_put(sk); | |
1669 | } | |
1670 | spin_unlock(&po->bind_lock); | |
1671 | ||
1672 | synchronize_net(); | |
1673 | ||
1674 | err = -EBUSY; | |
1675 | if (closing || atomic_read(&po->mapped) == 0) { | |
1676 | err = 0; | |
1677 | #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) | |
1678 | ||
1679 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1680 | pg_vec = XC(po->pg_vec, pg_vec); | |
1681 | po->frame_max = req->tp_frame_nr-1; | |
1682 | po->head = 0; | |
1683 | po->frame_size = req->tp_frame_size; | |
1684 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1685 | ||
1686 | order = XC(po->pg_vec_order, order); | |
1687 | req->tp_block_nr = XC(po->pg_vec_len, req->tp_block_nr); | |
1688 | ||
1689 | po->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
1690 | po->prot_hook.func = po->pg_vec ? tpacket_rcv : packet_rcv; | |
1691 | skb_queue_purge(&sk->sk_receive_queue); | |
1692 | #undef XC | |
1693 | if (atomic_read(&po->mapped)) | |
1694 | printk(KERN_DEBUG "packet_mmap: vma is busy: %d\n", atomic_read(&po->mapped)); | |
1695 | } | |
1696 | ||
1697 | spin_lock(&po->bind_lock); | |
1698 | if (was_running && !po->running) { | |
1699 | sock_hold(sk); | |
1700 | po->running = 1; | |
1701 | po->num = num; | |
1702 | dev_add_pack(&po->prot_hook); | |
1703 | } | |
1704 | spin_unlock(&po->bind_lock); | |
1705 | ||
1706 | release_sock(sk); | |
1707 | ||
1708 | out_free_pgvec: | |
1709 | if (pg_vec) | |
1710 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
1711 | out: | |
1712 | return err; | |
1713 | } | |
1714 | ||
1715 | static int packet_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
1716 | { | |
1717 | struct sock *sk = sock->sk; | |
1718 | struct packet_sock *po = pkt_sk(sk); | |
1719 | unsigned long size; | |
1720 | unsigned long start; | |
1721 | int err = -EINVAL; | |
1722 | int i; | |
1723 | ||
1724 | if (vma->vm_pgoff) | |
1725 | return -EINVAL; | |
1726 | ||
1727 | size = vma->vm_end - vma->vm_start; | |
1728 | ||
1729 | lock_sock(sk); | |
1730 | if (po->pg_vec == NULL) | |
1731 | goto out; | |
1732 | if (size != po->pg_vec_len*po->pg_vec_pages*PAGE_SIZE) | |
1733 | goto out; | |
1734 | ||
1735 | atomic_inc(&po->mapped); | |
1736 | start = vma->vm_start; | |
1737 | err = -EAGAIN; | |
1738 | for (i=0; i<po->pg_vec_len; i++) { | |
1739 | if (remap_pfn_range(vma, start, | |
1740 | __pa(po->pg_vec[i]) >> PAGE_SHIFT, | |
1741 | po->pg_vec_pages*PAGE_SIZE, | |
1742 | vma->vm_page_prot)) | |
1743 | goto out; | |
1744 | start += po->pg_vec_pages*PAGE_SIZE; | |
1745 | } | |
1746 | vma->vm_ops = &packet_mmap_ops; | |
1747 | err = 0; | |
1748 | ||
1749 | out: | |
1750 | release_sock(sk); | |
1751 | return err; | |
1752 | } | |
1753 | #endif | |
1754 | ||
1755 | ||
1756 | #ifdef CONFIG_SOCK_PACKET | |
1757 | static struct proto_ops packet_ops_spkt = { | |
1758 | .family = PF_PACKET, | |
1759 | .owner = THIS_MODULE, | |
1760 | .release = packet_release, | |
1761 | .bind = packet_bind_spkt, | |
1762 | .connect = sock_no_connect, | |
1763 | .socketpair = sock_no_socketpair, | |
1764 | .accept = sock_no_accept, | |
1765 | .getname = packet_getname_spkt, | |
1766 | .poll = datagram_poll, | |
1767 | .ioctl = packet_ioctl, | |
1768 | .listen = sock_no_listen, | |
1769 | .shutdown = sock_no_shutdown, | |
1770 | .setsockopt = sock_no_setsockopt, | |
1771 | .getsockopt = sock_no_getsockopt, | |
1772 | .sendmsg = packet_sendmsg_spkt, | |
1773 | .recvmsg = packet_recvmsg, | |
1774 | .mmap = sock_no_mmap, | |
1775 | .sendpage = sock_no_sendpage, | |
1776 | }; | |
1777 | #endif | |
1778 | ||
1779 | static struct proto_ops packet_ops = { | |
1780 | .family = PF_PACKET, | |
1781 | .owner = THIS_MODULE, | |
1782 | .release = packet_release, | |
1783 | .bind = packet_bind, | |
1784 | .connect = sock_no_connect, | |
1785 | .socketpair = sock_no_socketpair, | |
1786 | .accept = sock_no_accept, | |
1787 | .getname = packet_getname, | |
1788 | .poll = packet_poll, | |
1789 | .ioctl = packet_ioctl, | |
1790 | .listen = sock_no_listen, | |
1791 | .shutdown = sock_no_shutdown, | |
1792 | .setsockopt = packet_setsockopt, | |
1793 | .getsockopt = packet_getsockopt, | |
1794 | .sendmsg = packet_sendmsg, | |
1795 | .recvmsg = packet_recvmsg, | |
1796 | .mmap = packet_mmap, | |
1797 | .sendpage = sock_no_sendpage, | |
1798 | }; | |
1799 | ||
1800 | static struct net_proto_family packet_family_ops = { | |
1801 | .family = PF_PACKET, | |
1802 | .create = packet_create, | |
1803 | .owner = THIS_MODULE, | |
1804 | }; | |
1805 | ||
1806 | static struct notifier_block packet_netdev_notifier = { | |
1807 | .notifier_call =packet_notifier, | |
1808 | }; | |
1809 | ||
1810 | #ifdef CONFIG_PROC_FS | |
1811 | static inline struct sock *packet_seq_idx(loff_t off) | |
1812 | { | |
1813 | struct sock *s; | |
1814 | struct hlist_node *node; | |
1815 | ||
1816 | sk_for_each(s, node, &packet_sklist) { | |
1817 | if (!off--) | |
1818 | return s; | |
1819 | } | |
1820 | return NULL; | |
1821 | } | |
1822 | ||
1823 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
1824 | { | |
1825 | read_lock(&packet_sklist_lock); | |
1826 | return *pos ? packet_seq_idx(*pos - 1) : SEQ_START_TOKEN; | |
1827 | } | |
1828 | ||
1829 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1830 | { | |
1831 | ++*pos; | |
1832 | return (v == SEQ_START_TOKEN) | |
1833 | ? sk_head(&packet_sklist) | |
1834 | : sk_next((struct sock*)v) ; | |
1835 | } | |
1836 | ||
1837 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
1838 | { | |
1839 | read_unlock(&packet_sklist_lock); | |
1840 | } | |
1841 | ||
1842 | static int packet_seq_show(struct seq_file *seq, void *v) | |
1843 | { | |
1844 | if (v == SEQ_START_TOKEN) | |
1845 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
1846 | else { | |
1847 | struct sock *s = v; | |
1848 | const struct packet_sock *po = pkt_sk(s); | |
1849 | ||
1850 | seq_printf(seq, | |
1851 | "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", | |
1852 | s, | |
1853 | atomic_read(&s->sk_refcnt), | |
1854 | s->sk_type, | |
1855 | ntohs(po->num), | |
1856 | po->ifindex, | |
1857 | po->running, | |
1858 | atomic_read(&s->sk_rmem_alloc), | |
1859 | sock_i_uid(s), | |
1860 | sock_i_ino(s) ); | |
1861 | } | |
1862 | ||
1863 | return 0; | |
1864 | } | |
1865 | ||
1866 | static struct seq_operations packet_seq_ops = { | |
1867 | .start = packet_seq_start, | |
1868 | .next = packet_seq_next, | |
1869 | .stop = packet_seq_stop, | |
1870 | .show = packet_seq_show, | |
1871 | }; | |
1872 | ||
1873 | static int packet_seq_open(struct inode *inode, struct file *file) | |
1874 | { | |
1875 | return seq_open(file, &packet_seq_ops); | |
1876 | } | |
1877 | ||
1878 | static struct file_operations packet_seq_fops = { | |
1879 | .owner = THIS_MODULE, | |
1880 | .open = packet_seq_open, | |
1881 | .read = seq_read, | |
1882 | .llseek = seq_lseek, | |
1883 | .release = seq_release, | |
1884 | }; | |
1885 | ||
1886 | #endif | |
1887 | ||
1888 | static void __exit packet_exit(void) | |
1889 | { | |
1890 | proc_net_remove("packet"); | |
1891 | unregister_netdevice_notifier(&packet_netdev_notifier); | |
1892 | sock_unregister(PF_PACKET); | |
1893 | proto_unregister(&packet_proto); | |
1894 | } | |
1895 | ||
1896 | static int __init packet_init(void) | |
1897 | { | |
1898 | int rc = proto_register(&packet_proto, 0); | |
1899 | ||
1900 | if (rc != 0) | |
1901 | goto out; | |
1902 | ||
1903 | sock_register(&packet_family_ops); | |
1904 | register_netdevice_notifier(&packet_netdev_notifier); | |
1905 | proc_net_fops_create("packet", 0, &packet_seq_fops); | |
1906 | out: | |
1907 | return rc; | |
1908 | } | |
1909 | ||
1910 | module_init(packet_init); | |
1911 | module_exit(packet_exit); | |
1912 | MODULE_LICENSE("GPL"); | |
1913 | MODULE_ALIAS_NETPROTO(PF_PACKET); |