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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * PACKET - implements raw packet sockets. | |
7 | * | |
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 | ||
1da177e4 LT |
52 | #include <linux/types.h> |
53 | #include <linux/sched.h> | |
54 | #include <linux/mm.h> | |
4fc268d2 | 55 | #include <linux/capability.h> |
1da177e4 LT |
56 | #include <linux/fcntl.h> |
57 | #include <linux/socket.h> | |
58 | #include <linux/in.h> | |
59 | #include <linux/inet.h> | |
60 | #include <linux/netdevice.h> | |
61 | #include <linux/if_packet.h> | |
62 | #include <linux/wireless.h> | |
63 | #include <linux/kmod.h> | |
64 | #include <net/ip.h> | |
65 | #include <net/protocol.h> | |
66 | #include <linux/skbuff.h> | |
67 | #include <net/sock.h> | |
68 | #include <linux/errno.h> | |
69 | #include <linux/timer.h> | |
70 | #include <asm/system.h> | |
71 | #include <asm/uaccess.h> | |
72 | #include <asm/ioctls.h> | |
73 | #include <asm/page.h> | |
74 | #include <asm/io.h> | |
75 | #include <linux/proc_fs.h> | |
76 | #include <linux/seq_file.h> | |
77 | #include <linux/poll.h> | |
78 | #include <linux/module.h> | |
79 | #include <linux/init.h> | |
80 | ||
81 | #ifdef CONFIG_INET | |
82 | #include <net/inet_common.h> | |
83 | #endif | |
84 | ||
85 | #define CONFIG_SOCK_PACKET 1 | |
86 | ||
87 | /* | |
88 | Proposed replacement for SIOC{ADD,DEL}MULTI and | |
89 | IFF_PROMISC, IFF_ALLMULTI flags. | |
90 | ||
91 | It is more expensive, but I believe, | |
92 | it is really correct solution: reentereble, safe and fault tolerant. | |
93 | ||
94 | IFF_PROMISC/IFF_ALLMULTI/SIOC{ADD/DEL}MULTI are faked by keeping | |
95 | reference count and global flag, so that real status is | |
96 | (gflag|(count != 0)), so that we can use obsolete faulty interface | |
97 | not harming clever users. | |
98 | */ | |
99 | #define CONFIG_PACKET_MULTICAST 1 | |
100 | ||
101 | /* | |
102 | Assumptions: | |
103 | - if device has no dev->hard_header routine, it adds and removes ll header | |
104 | inside itself. In this case ll header is invisible outside of device, | |
105 | but higher levels still should reserve dev->hard_header_len. | |
106 | Some devices are enough clever to reallocate skb, when header | |
107 | will not fit to reserved space (tunnel), another ones are silly | |
108 | (PPP). | |
109 | - packet socket receives packets with pulled ll header, | |
110 | so that SOCK_RAW should push it back. | |
111 | ||
112 | On receive: | |
113 | ----------- | |
114 | ||
115 | Incoming, dev->hard_header!=NULL | |
116 | mac.raw -> ll header | |
117 | data -> data | |
118 | ||
119 | Outgoing, dev->hard_header!=NULL | |
120 | mac.raw -> ll header | |
121 | data -> ll header | |
122 | ||
123 | Incoming, dev->hard_header==NULL | |
124 | mac.raw -> UNKNOWN position. It is very likely, that it points to ll header. | |
125 | PPP makes it, that is wrong, because introduce assymetry | |
126 | between rx and tx paths. | |
127 | data -> data | |
128 | ||
129 | Outgoing, dev->hard_header==NULL | |
130 | mac.raw -> data. ll header is still not built! | |
131 | data -> data | |
132 | ||
133 | Resume | |
134 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. | |
135 | ||
136 | ||
137 | On transmit: | |
138 | ------------ | |
139 | ||
140 | dev->hard_header != NULL | |
141 | mac.raw -> ll header | |
142 | data -> ll header | |
143 | ||
144 | dev->hard_header == NULL (ll header is added by device, we cannot control it) | |
145 | mac.raw -> data | |
146 | data -> data | |
147 | ||
148 | We should set nh.raw on output to correct posistion, | |
149 | packet classifier depends on it. | |
150 | */ | |
151 | ||
152 | /* List of all packet sockets. */ | |
153 | static HLIST_HEAD(packet_sklist); | |
154 | static DEFINE_RWLOCK(packet_sklist_lock); | |
155 | ||
156 | static atomic_t packet_socks_nr; | |
157 | ||
158 | ||
159 | /* Private packet socket structures. */ | |
160 | ||
161 | #ifdef CONFIG_PACKET_MULTICAST | |
162 | struct packet_mclist | |
163 | { | |
164 | struct packet_mclist *next; | |
165 | int ifindex; | |
166 | int count; | |
167 | unsigned short type; | |
168 | unsigned short alen; | |
0fb375fb EB |
169 | unsigned char addr[MAX_ADDR_LEN]; |
170 | }; | |
171 | /* identical to struct packet_mreq except it has | |
172 | * a longer address field. | |
173 | */ | |
174 | struct packet_mreq_max | |
175 | { | |
176 | int mr_ifindex; | |
177 | unsigned short mr_type; | |
178 | unsigned short mr_alen; | |
179 | unsigned char mr_address[MAX_ADDR_LEN]; | |
1da177e4 LT |
180 | }; |
181 | #endif | |
182 | #ifdef CONFIG_PACKET_MMAP | |
183 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing); | |
184 | #endif | |
185 | ||
186 | static void packet_flush_mclist(struct sock *sk); | |
187 | ||
188 | struct packet_sock { | |
189 | /* struct sock has to be the first member of packet_sock */ | |
190 | struct sock sk; | |
191 | struct tpacket_stats stats; | |
192 | #ifdef CONFIG_PACKET_MMAP | |
193 | char * *pg_vec; | |
194 | unsigned int head; | |
195 | unsigned int frames_per_block; | |
196 | unsigned int frame_size; | |
197 | unsigned int frame_max; | |
198 | int copy_thresh; | |
199 | #endif | |
200 | struct packet_type prot_hook; | |
201 | spinlock_t bind_lock; | |
202 | char running; /* prot_hook is attached*/ | |
203 | int ifindex; /* bound device */ | |
204 | unsigned short num; | |
205 | #ifdef CONFIG_PACKET_MULTICAST | |
206 | struct packet_mclist *mclist; | |
207 | #endif | |
208 | #ifdef CONFIG_PACKET_MMAP | |
209 | atomic_t mapped; | |
210 | unsigned int pg_vec_order; | |
211 | unsigned int pg_vec_pages; | |
212 | unsigned int pg_vec_len; | |
213 | #endif | |
214 | }; | |
215 | ||
216 | #ifdef CONFIG_PACKET_MMAP | |
217 | ||
218 | static inline char *packet_lookup_frame(struct packet_sock *po, unsigned int position) | |
219 | { | |
220 | unsigned int pg_vec_pos, frame_offset; | |
221 | char *frame; | |
222 | ||
223 | pg_vec_pos = position / po->frames_per_block; | |
224 | frame_offset = position % po->frames_per_block; | |
225 | ||
226 | frame = po->pg_vec[pg_vec_pos] + (frame_offset * po->frame_size); | |
227 | ||
228 | return frame; | |
229 | } | |
230 | #endif | |
231 | ||
232 | static inline struct packet_sock *pkt_sk(struct sock *sk) | |
233 | { | |
234 | return (struct packet_sock *)sk; | |
235 | } | |
236 | ||
237 | static void packet_sock_destruct(struct sock *sk) | |
238 | { | |
239 | BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); | |
240 | BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); | |
241 | ||
242 | if (!sock_flag(sk, SOCK_DEAD)) { | |
243 | printk("Attempt to release alive packet socket: %p\n", sk); | |
244 | return; | |
245 | } | |
246 | ||
247 | atomic_dec(&packet_socks_nr); | |
248 | #ifdef PACKET_REFCNT_DEBUG | |
249 | printk(KERN_DEBUG "PACKET socket %p is free, %d are alive\n", sk, atomic_read(&packet_socks_nr)); | |
250 | #endif | |
251 | } | |
252 | ||
253 | ||
90ddc4f0 | 254 | static const struct proto_ops packet_ops; |
1da177e4 LT |
255 | |
256 | #ifdef CONFIG_SOCK_PACKET | |
90ddc4f0 | 257 | static const struct proto_ops packet_ops_spkt; |
1da177e4 | 258 | |
f2ccd8fa | 259 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
260 | { |
261 | struct sock *sk; | |
262 | struct sockaddr_pkt *spkt; | |
263 | ||
264 | /* | |
265 | * When we registered the protocol we saved the socket in the data | |
266 | * field for just this event. | |
267 | */ | |
268 | ||
269 | sk = pt->af_packet_priv; | |
270 | ||
271 | /* | |
272 | * Yank back the headers [hope the device set this | |
273 | * right or kerboom...] | |
274 | * | |
275 | * Incoming packets have ll header pulled, | |
276 | * push it back. | |
277 | * | |
278 | * For outgoing ones skb->data == skb->mac.raw | |
279 | * so that this procedure is noop. | |
280 | */ | |
281 | ||
282 | if (skb->pkt_type == PACKET_LOOPBACK) | |
283 | goto out; | |
284 | ||
285 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
286 | goto oom; | |
287 | ||
288 | /* drop any routing info */ | |
289 | dst_release(skb->dst); | |
290 | skb->dst = NULL; | |
291 | ||
84531c24 PO |
292 | /* drop conntrack reference */ |
293 | nf_reset(skb); | |
294 | ||
1da177e4 LT |
295 | spkt = (struct sockaddr_pkt*)skb->cb; |
296 | ||
297 | skb_push(skb, skb->data-skb->mac.raw); | |
298 | ||
299 | /* | |
300 | * The SOCK_PACKET socket receives _all_ frames. | |
301 | */ | |
302 | ||
303 | spkt->spkt_family = dev->type; | |
304 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
305 | spkt->spkt_protocol = skb->protocol; | |
306 | ||
307 | /* | |
308 | * Charge the memory to the socket. This is done specifically | |
309 | * to prevent sockets using all the memory up. | |
310 | */ | |
311 | ||
312 | if (sock_queue_rcv_skb(sk,skb) == 0) | |
313 | return 0; | |
314 | ||
315 | out: | |
316 | kfree_skb(skb); | |
317 | oom: | |
318 | return 0; | |
319 | } | |
320 | ||
321 | ||
322 | /* | |
323 | * Output a raw packet to a device layer. This bypasses all the other | |
324 | * protocol layers and you must therefore supply it with a complete frame | |
325 | */ | |
326 | ||
327 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, | |
328 | struct msghdr *msg, size_t len) | |
329 | { | |
330 | struct sock *sk = sock->sk; | |
331 | struct sockaddr_pkt *saddr=(struct sockaddr_pkt *)msg->msg_name; | |
332 | struct sk_buff *skb; | |
333 | struct net_device *dev; | |
334 | unsigned short proto=0; | |
335 | int err; | |
336 | ||
337 | /* | |
338 | * Get and verify the address. | |
339 | */ | |
340 | ||
341 | if (saddr) | |
342 | { | |
343 | if (msg->msg_namelen < sizeof(struct sockaddr)) | |
344 | return(-EINVAL); | |
345 | if (msg->msg_namelen==sizeof(struct sockaddr_pkt)) | |
346 | proto=saddr->spkt_protocol; | |
347 | } | |
348 | else | |
349 | return(-ENOTCONN); /* SOCK_PACKET must be sent giving an address */ | |
350 | ||
351 | /* | |
352 | * Find the device first to size check it | |
353 | */ | |
354 | ||
355 | saddr->spkt_device[13] = 0; | |
356 | dev = dev_get_by_name(saddr->spkt_device); | |
357 | err = -ENODEV; | |
358 | if (dev == NULL) | |
359 | goto out_unlock; | |
360 | ||
361 | /* | |
362 | * You may not queue a frame bigger than the mtu. This is the lowest level | |
363 | * raw protocol and you must do your own fragmentation at this level. | |
364 | */ | |
365 | ||
366 | err = -EMSGSIZE; | |
8ae55f04 | 367 | if (len > dev->mtu + dev->hard_header_len) |
1da177e4 LT |
368 | goto out_unlock; |
369 | ||
370 | err = -ENOBUFS; | |
371 | skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL); | |
372 | ||
373 | /* | |
374 | * If the write buffer is full, then tough. At this level the user gets to | |
375 | * deal with the problem - do your own algorithmic backoffs. That's far | |
376 | * more flexible. | |
377 | */ | |
378 | ||
379 | if (skb == NULL) | |
380 | goto out_unlock; | |
381 | ||
382 | /* | |
383 | * Fill it in | |
384 | */ | |
385 | ||
386 | /* FIXME: Save some space for broken drivers that write a | |
387 | * hard header at transmission time by themselves. PPP is the | |
388 | * notable one here. This should really be fixed at the driver level. | |
389 | */ | |
390 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
391 | skb->nh.raw = skb->data; | |
392 | ||
393 | /* Try to align data part correctly */ | |
394 | if (dev->hard_header) { | |
395 | skb->data -= dev->hard_header_len; | |
396 | skb->tail -= dev->hard_header_len; | |
397 | if (len < dev->hard_header_len) | |
398 | skb->nh.raw = skb->data; | |
399 | } | |
400 | ||
401 | /* Returns -EFAULT on error */ | |
402 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); | |
403 | skb->protocol = proto; | |
404 | skb->dev = dev; | |
405 | skb->priority = sk->sk_priority; | |
406 | if (err) | |
407 | goto out_free; | |
408 | ||
409 | err = -ENETDOWN; | |
410 | if (!(dev->flags & IFF_UP)) | |
411 | goto out_free; | |
412 | ||
413 | /* | |
414 | * Now send it | |
415 | */ | |
416 | ||
417 | dev_queue_xmit(skb); | |
418 | dev_put(dev); | |
419 | return(len); | |
420 | ||
421 | out_free: | |
422 | kfree_skb(skb); | |
423 | out_unlock: | |
424 | if (dev) | |
425 | dev_put(dev); | |
426 | return err; | |
427 | } | |
428 | #endif | |
429 | ||
430 | static inline unsigned run_filter(struct sk_buff *skb, struct sock *sk, unsigned res) | |
431 | { | |
432 | struct sk_filter *filter; | |
433 | ||
434 | bh_lock_sock(sk); | |
435 | filter = sk->sk_filter; | |
436 | /* | |
437 | * Our caller already checked that filter != NULL but we need to | |
438 | * verify that under bh_lock_sock() to be safe | |
439 | */ | |
440 | if (likely(filter != NULL)) | |
441 | res = sk_run_filter(skb, filter->insns, filter->len); | |
442 | bh_unlock_sock(sk); | |
443 | ||
444 | return res; | |
445 | } | |
446 | ||
447 | /* | |
448 | This function makes lazy skb cloning in hope that most of packets | |
449 | are discarded by BPF. | |
450 | ||
451 | Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
452 | and skb->cb are mangled. It works because (and until) packets | |
453 | falling here are owned by current CPU. Output packets are cloned | |
454 | by dev_queue_xmit_nit(), input packets are processed by net_bh | |
455 | sequencially, so that if we return skb to original state on exit, | |
456 | we will not harm anyone. | |
457 | */ | |
458 | ||
f2ccd8fa | 459 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
460 | { |
461 | struct sock *sk; | |
462 | struct sockaddr_ll *sll; | |
463 | struct packet_sock *po; | |
464 | u8 * skb_head = skb->data; | |
465 | int skb_len = skb->len; | |
466 | unsigned snaplen; | |
467 | ||
468 | if (skb->pkt_type == PACKET_LOOPBACK) | |
469 | goto drop; | |
470 | ||
471 | sk = pt->af_packet_priv; | |
472 | po = pkt_sk(sk); | |
473 | ||
474 | skb->dev = dev; | |
475 | ||
476 | if (dev->hard_header) { | |
477 | /* The device has an explicit notion of ll header, | |
478 | exported to higher levels. | |
479 | ||
480 | Otherwise, the device hides datails of it frame | |
481 | structure, so that corresponding packet head | |
482 | never delivered to user. | |
483 | */ | |
484 | if (sk->sk_type != SOCK_DGRAM) | |
485 | skb_push(skb, skb->data - skb->mac.raw); | |
486 | else if (skb->pkt_type == PACKET_OUTGOING) { | |
487 | /* Special case: outgoing packets have ll header at head */ | |
488 | skb_pull(skb, skb->nh.raw - skb->data); | |
489 | } | |
490 | } | |
491 | ||
492 | snaplen = skb->len; | |
493 | ||
494 | if (sk->sk_filter) { | |
495 | unsigned res = run_filter(skb, sk, snaplen); | |
496 | if (res == 0) | |
497 | goto drop_n_restore; | |
498 | if (snaplen > res) | |
499 | snaplen = res; | |
500 | } | |
501 | ||
502 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
503 | (unsigned)sk->sk_rcvbuf) | |
504 | goto drop_n_acct; | |
505 | ||
506 | if (skb_shared(skb)) { | |
507 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
508 | if (nskb == NULL) | |
509 | goto drop_n_acct; | |
510 | ||
511 | if (skb_head != skb->data) { | |
512 | skb->data = skb_head; | |
513 | skb->len = skb_len; | |
514 | } | |
515 | kfree_skb(skb); | |
516 | skb = nskb; | |
517 | } | |
518 | ||
519 | sll = (struct sockaddr_ll*)skb->cb; | |
520 | sll->sll_family = AF_PACKET; | |
521 | sll->sll_hatype = dev->type; | |
522 | sll->sll_protocol = skb->protocol; | |
523 | sll->sll_pkttype = skb->pkt_type; | |
524 | sll->sll_ifindex = dev->ifindex; | |
525 | sll->sll_halen = 0; | |
526 | ||
527 | if (dev->hard_header_parse) | |
528 | sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); | |
529 | ||
530 | if (pskb_trim(skb, snaplen)) | |
531 | goto drop_n_acct; | |
532 | ||
533 | skb_set_owner_r(skb, sk); | |
534 | skb->dev = NULL; | |
535 | dst_release(skb->dst); | |
536 | skb->dst = NULL; | |
537 | ||
84531c24 PO |
538 | /* drop conntrack reference */ |
539 | nf_reset(skb); | |
540 | ||
1da177e4 LT |
541 | spin_lock(&sk->sk_receive_queue.lock); |
542 | po->stats.tp_packets++; | |
543 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
544 | spin_unlock(&sk->sk_receive_queue.lock); | |
545 | sk->sk_data_ready(sk, skb->len); | |
546 | return 0; | |
547 | ||
548 | drop_n_acct: | |
549 | spin_lock(&sk->sk_receive_queue.lock); | |
550 | po->stats.tp_drops++; | |
551 | spin_unlock(&sk->sk_receive_queue.lock); | |
552 | ||
553 | drop_n_restore: | |
554 | if (skb_head != skb->data && skb_shared(skb)) { | |
555 | skb->data = skb_head; | |
556 | skb->len = skb_len; | |
557 | } | |
558 | drop: | |
559 | kfree_skb(skb); | |
560 | return 0; | |
561 | } | |
562 | ||
563 | #ifdef CONFIG_PACKET_MMAP | |
f2ccd8fa | 564 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
565 | { |
566 | struct sock *sk; | |
567 | struct packet_sock *po; | |
568 | struct sockaddr_ll *sll; | |
569 | struct tpacket_hdr *h; | |
570 | u8 * skb_head = skb->data; | |
571 | int skb_len = skb->len; | |
572 | unsigned snaplen; | |
573 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; | |
574 | unsigned short macoff, netoff; | |
575 | struct sk_buff *copy_skb = NULL; | |
576 | ||
577 | if (skb->pkt_type == PACKET_LOOPBACK) | |
578 | goto drop; | |
579 | ||
580 | sk = pt->af_packet_priv; | |
581 | po = pkt_sk(sk); | |
582 | ||
583 | if (dev->hard_header) { | |
584 | if (sk->sk_type != SOCK_DGRAM) | |
585 | skb_push(skb, skb->data - skb->mac.raw); | |
586 | else if (skb->pkt_type == PACKET_OUTGOING) { | |
587 | /* Special case: outgoing packets have ll header at head */ | |
588 | skb_pull(skb, skb->nh.raw - skb->data); | |
84fa7933 | 589 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
1da177e4 LT |
590 | status |= TP_STATUS_CSUMNOTREADY; |
591 | } | |
592 | } | |
593 | ||
594 | snaplen = skb->len; | |
595 | ||
596 | if (sk->sk_filter) { | |
597 | unsigned res = run_filter(skb, sk, snaplen); | |
598 | if (res == 0) | |
599 | goto drop_n_restore; | |
600 | if (snaplen > res) | |
601 | snaplen = res; | |
602 | } | |
603 | ||
604 | if (sk->sk_type == SOCK_DGRAM) { | |
605 | macoff = netoff = TPACKET_ALIGN(TPACKET_HDRLEN) + 16; | |
606 | } else { | |
607 | unsigned maclen = skb->nh.raw - skb->data; | |
608 | netoff = TPACKET_ALIGN(TPACKET_HDRLEN + (maclen < 16 ? 16 : maclen)); | |
609 | macoff = netoff - maclen; | |
610 | } | |
611 | ||
612 | if (macoff + snaplen > po->frame_size) { | |
613 | if (po->copy_thresh && | |
614 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < | |
615 | (unsigned)sk->sk_rcvbuf) { | |
616 | if (skb_shared(skb)) { | |
617 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
618 | } else { | |
619 | copy_skb = skb_get(skb); | |
620 | skb_head = skb->data; | |
621 | } | |
622 | if (copy_skb) | |
623 | skb_set_owner_r(copy_skb, sk); | |
624 | } | |
625 | snaplen = po->frame_size - macoff; | |
626 | if ((int)snaplen < 0) | |
627 | snaplen = 0; | |
628 | } | |
1da177e4 LT |
629 | |
630 | spin_lock(&sk->sk_receive_queue.lock); | |
631 | h = (struct tpacket_hdr *)packet_lookup_frame(po, po->head); | |
632 | ||
633 | if (h->tp_status) | |
634 | goto ring_is_full; | |
635 | po->head = po->head != po->frame_max ? po->head+1 : 0; | |
636 | po->stats.tp_packets++; | |
637 | if (copy_skb) { | |
638 | status |= TP_STATUS_COPY; | |
639 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
640 | } | |
641 | if (!po->stats.tp_drops) | |
642 | status &= ~TP_STATUS_LOSING; | |
643 | spin_unlock(&sk->sk_receive_queue.lock); | |
644 | ||
cbe21d8f | 645 | skb_copy_bits(skb, 0, (u8*)h + macoff, snaplen); |
1da177e4 LT |
646 | |
647 | h->tp_len = skb->len; | |
648 | h->tp_snaplen = snaplen; | |
649 | h->tp_mac = macoff; | |
650 | h->tp_net = netoff; | |
a61bbcf2 PM |
651 | if (skb->tstamp.off_sec == 0) { |
652 | __net_timestamp(skb); | |
1da177e4 LT |
653 | sock_enable_timestamp(sk); |
654 | } | |
325ed823 HX |
655 | h->tp_sec = skb->tstamp.off_sec; |
656 | h->tp_usec = skb->tstamp.off_usec; | |
1da177e4 LT |
657 | |
658 | sll = (struct sockaddr_ll*)((u8*)h + TPACKET_ALIGN(sizeof(*h))); | |
659 | sll->sll_halen = 0; | |
660 | if (dev->hard_header_parse) | |
661 | sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); | |
662 | sll->sll_family = AF_PACKET; | |
663 | sll->sll_hatype = dev->type; | |
664 | sll->sll_protocol = skb->protocol; | |
665 | sll->sll_pkttype = skb->pkt_type; | |
666 | sll->sll_ifindex = dev->ifindex; | |
667 | ||
668 | h->tp_status = status; | |
669 | mb(); | |
670 | ||
671 | { | |
672 | struct page *p_start, *p_end; | |
673 | u8 *h_end = (u8 *)h + macoff + snaplen - 1; | |
674 | ||
675 | p_start = virt_to_page(h); | |
676 | p_end = virt_to_page(h_end); | |
677 | while (p_start <= p_end) { | |
678 | flush_dcache_page(p_start); | |
679 | p_start++; | |
680 | } | |
681 | } | |
682 | ||
683 | sk->sk_data_ready(sk, 0); | |
684 | ||
685 | drop_n_restore: | |
686 | if (skb_head != skb->data && skb_shared(skb)) { | |
687 | skb->data = skb_head; | |
688 | skb->len = skb_len; | |
689 | } | |
690 | drop: | |
691 | kfree_skb(skb); | |
692 | return 0; | |
693 | ||
694 | ring_is_full: | |
695 | po->stats.tp_drops++; | |
696 | spin_unlock(&sk->sk_receive_queue.lock); | |
697 | ||
698 | sk->sk_data_ready(sk, 0); | |
699 | if (copy_skb) | |
700 | kfree_skb(copy_skb); | |
701 | goto drop_n_restore; | |
702 | } | |
703 | ||
704 | #endif | |
705 | ||
706 | ||
707 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, | |
708 | struct msghdr *msg, size_t len) | |
709 | { | |
710 | struct sock *sk = sock->sk; | |
711 | struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name; | |
712 | struct sk_buff *skb; | |
713 | struct net_device *dev; | |
714 | unsigned short proto; | |
715 | unsigned char *addr; | |
716 | int ifindex, err, reserve = 0; | |
717 | ||
718 | /* | |
719 | * Get and verify the address. | |
720 | */ | |
721 | ||
722 | if (saddr == NULL) { | |
723 | struct packet_sock *po = pkt_sk(sk); | |
724 | ||
725 | ifindex = po->ifindex; | |
726 | proto = po->num; | |
727 | addr = NULL; | |
728 | } else { | |
729 | err = -EINVAL; | |
730 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
731 | goto out; | |
0fb375fb EB |
732 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
733 | goto out; | |
1da177e4 LT |
734 | ifindex = saddr->sll_ifindex; |
735 | proto = saddr->sll_protocol; | |
736 | addr = saddr->sll_addr; | |
737 | } | |
738 | ||
739 | ||
740 | dev = dev_get_by_index(ifindex); | |
741 | err = -ENXIO; | |
742 | if (dev == NULL) | |
743 | goto out_unlock; | |
744 | if (sock->type == SOCK_RAW) | |
745 | reserve = dev->hard_header_len; | |
746 | ||
747 | err = -EMSGSIZE; | |
748 | if (len > dev->mtu+reserve) | |
749 | goto out_unlock; | |
750 | ||
751 | skb = sock_alloc_send_skb(sk, len + LL_RESERVED_SPACE(dev), | |
752 | msg->msg_flags & MSG_DONTWAIT, &err); | |
753 | if (skb==NULL) | |
754 | goto out_unlock; | |
755 | ||
756 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
757 | skb->nh.raw = skb->data; | |
758 | ||
759 | if (dev->hard_header) { | |
760 | int res; | |
761 | err = -EINVAL; | |
762 | res = dev->hard_header(skb, dev, ntohs(proto), addr, NULL, len); | |
763 | if (sock->type != SOCK_DGRAM) { | |
764 | skb->tail = skb->data; | |
765 | skb->len = 0; | |
766 | } else if (res < 0) | |
767 | goto out_free; | |
768 | } | |
769 | ||
770 | /* Returns -EFAULT on error */ | |
771 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); | |
772 | if (err) | |
773 | goto out_free; | |
774 | ||
775 | skb->protocol = proto; | |
776 | skb->dev = dev; | |
777 | skb->priority = sk->sk_priority; | |
778 | ||
779 | err = -ENETDOWN; | |
780 | if (!(dev->flags & IFF_UP)) | |
781 | goto out_free; | |
782 | ||
783 | /* | |
784 | * Now send it | |
785 | */ | |
786 | ||
787 | err = dev_queue_xmit(skb); | |
788 | if (err > 0 && (err = net_xmit_errno(err)) != 0) | |
789 | goto out_unlock; | |
790 | ||
791 | dev_put(dev); | |
792 | ||
793 | return(len); | |
794 | ||
795 | out_free: | |
796 | kfree_skb(skb); | |
797 | out_unlock: | |
798 | if (dev) | |
799 | dev_put(dev); | |
800 | out: | |
801 | return err; | |
802 | } | |
803 | ||
804 | /* | |
805 | * Close a PACKET socket. This is fairly simple. We immediately go | |
806 | * to 'closed' state and remove our protocol entry in the device list. | |
807 | */ | |
808 | ||
809 | static int packet_release(struct socket *sock) | |
810 | { | |
811 | struct sock *sk = sock->sk; | |
812 | struct packet_sock *po; | |
813 | ||
814 | if (!sk) | |
815 | return 0; | |
816 | ||
817 | po = pkt_sk(sk); | |
818 | ||
819 | write_lock_bh(&packet_sklist_lock); | |
820 | sk_del_node_init(sk); | |
821 | write_unlock_bh(&packet_sklist_lock); | |
822 | ||
823 | /* | |
824 | * Unhook packet receive handler. | |
825 | */ | |
826 | ||
827 | if (po->running) { | |
828 | /* | |
829 | * Remove the protocol hook | |
830 | */ | |
831 | dev_remove_pack(&po->prot_hook); | |
832 | po->running = 0; | |
833 | po->num = 0; | |
834 | __sock_put(sk); | |
835 | } | |
836 | ||
837 | #ifdef CONFIG_PACKET_MULTICAST | |
838 | packet_flush_mclist(sk); | |
839 | #endif | |
840 | ||
841 | #ifdef CONFIG_PACKET_MMAP | |
842 | if (po->pg_vec) { | |
843 | struct tpacket_req req; | |
844 | memset(&req, 0, sizeof(req)); | |
845 | packet_set_ring(sk, &req, 1); | |
846 | } | |
847 | #endif | |
848 | ||
849 | /* | |
850 | * Now the socket is dead. No more input will appear. | |
851 | */ | |
852 | ||
853 | sock_orphan(sk); | |
854 | sock->sk = NULL; | |
855 | ||
856 | /* Purge queues */ | |
857 | ||
858 | skb_queue_purge(&sk->sk_receive_queue); | |
859 | ||
860 | sock_put(sk); | |
861 | return 0; | |
862 | } | |
863 | ||
864 | /* | |
865 | * Attach a packet hook. | |
866 | */ | |
867 | ||
868 | static int packet_do_bind(struct sock *sk, struct net_device *dev, int protocol) | |
869 | { | |
870 | struct packet_sock *po = pkt_sk(sk); | |
871 | /* | |
872 | * Detach an existing hook if present. | |
873 | */ | |
874 | ||
875 | lock_sock(sk); | |
876 | ||
877 | spin_lock(&po->bind_lock); | |
878 | if (po->running) { | |
879 | __sock_put(sk); | |
880 | po->running = 0; | |
881 | po->num = 0; | |
882 | spin_unlock(&po->bind_lock); | |
883 | dev_remove_pack(&po->prot_hook); | |
884 | spin_lock(&po->bind_lock); | |
885 | } | |
886 | ||
887 | po->num = protocol; | |
888 | po->prot_hook.type = protocol; | |
889 | po->prot_hook.dev = dev; | |
890 | ||
891 | po->ifindex = dev ? dev->ifindex : 0; | |
892 | ||
893 | if (protocol == 0) | |
894 | goto out_unlock; | |
895 | ||
896 | if (dev) { | |
897 | if (dev->flags&IFF_UP) { | |
898 | dev_add_pack(&po->prot_hook); | |
899 | sock_hold(sk); | |
900 | po->running = 1; | |
901 | } else { | |
902 | sk->sk_err = ENETDOWN; | |
903 | if (!sock_flag(sk, SOCK_DEAD)) | |
904 | sk->sk_error_report(sk); | |
905 | } | |
906 | } else { | |
907 | dev_add_pack(&po->prot_hook); | |
908 | sock_hold(sk); | |
909 | po->running = 1; | |
910 | } | |
911 | ||
912 | out_unlock: | |
913 | spin_unlock(&po->bind_lock); | |
914 | release_sock(sk); | |
915 | return 0; | |
916 | } | |
917 | ||
918 | /* | |
919 | * Bind a packet socket to a device | |
920 | */ | |
921 | ||
922 | #ifdef CONFIG_SOCK_PACKET | |
923 | ||
924 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
925 | { | |
926 | struct sock *sk=sock->sk; | |
927 | char name[15]; | |
928 | struct net_device *dev; | |
929 | int err = -ENODEV; | |
930 | ||
931 | /* | |
932 | * Check legality | |
933 | */ | |
934 | ||
8ae55f04 | 935 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 LT |
936 | return -EINVAL; |
937 | strlcpy(name,uaddr->sa_data,sizeof(name)); | |
938 | ||
939 | dev = dev_get_by_name(name); | |
940 | if (dev) { | |
941 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); | |
942 | dev_put(dev); | |
943 | } | |
944 | return err; | |
945 | } | |
946 | #endif | |
947 | ||
948 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
949 | { | |
950 | struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; | |
951 | struct sock *sk=sock->sk; | |
952 | struct net_device *dev = NULL; | |
953 | int err; | |
954 | ||
955 | ||
956 | /* | |
957 | * Check legality | |
958 | */ | |
959 | ||
960 | if (addr_len < sizeof(struct sockaddr_ll)) | |
961 | return -EINVAL; | |
962 | if (sll->sll_family != AF_PACKET) | |
963 | return -EINVAL; | |
964 | ||
965 | if (sll->sll_ifindex) { | |
966 | err = -ENODEV; | |
967 | dev = dev_get_by_index(sll->sll_ifindex); | |
968 | if (dev == NULL) | |
969 | goto out; | |
970 | } | |
971 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
972 | if (dev) | |
973 | dev_put(dev); | |
974 | ||
975 | out: | |
976 | return err; | |
977 | } | |
978 | ||
979 | static struct proto packet_proto = { | |
980 | .name = "PACKET", | |
981 | .owner = THIS_MODULE, | |
982 | .obj_size = sizeof(struct packet_sock), | |
983 | }; | |
984 | ||
985 | /* | |
986 | * Create a packet of type SOCK_PACKET. | |
987 | */ | |
988 | ||
989 | static int packet_create(struct socket *sock, int protocol) | |
990 | { | |
991 | struct sock *sk; | |
992 | struct packet_sock *po; | |
993 | int err; | |
994 | ||
995 | if (!capable(CAP_NET_RAW)) | |
996 | return -EPERM; | |
997 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW | |
998 | #ifdef CONFIG_SOCK_PACKET | |
999 | && sock->type != SOCK_PACKET | |
1000 | #endif | |
1001 | ) | |
1002 | return -ESOCKTNOSUPPORT; | |
1003 | ||
1004 | sock->state = SS_UNCONNECTED; | |
1005 | ||
1006 | err = -ENOBUFS; | |
1007 | sk = sk_alloc(PF_PACKET, GFP_KERNEL, &packet_proto, 1); | |
1008 | if (sk == NULL) | |
1009 | goto out; | |
1010 | ||
1011 | sock->ops = &packet_ops; | |
1012 | #ifdef CONFIG_SOCK_PACKET | |
1013 | if (sock->type == SOCK_PACKET) | |
1014 | sock->ops = &packet_ops_spkt; | |
1015 | #endif | |
1016 | sock_init_data(sock, sk); | |
1017 | ||
1018 | po = pkt_sk(sk); | |
1019 | sk->sk_family = PF_PACKET; | |
1020 | po->num = protocol; | |
1021 | ||
1022 | sk->sk_destruct = packet_sock_destruct; | |
1023 | atomic_inc(&packet_socks_nr); | |
1024 | ||
1025 | /* | |
1026 | * Attach a protocol block | |
1027 | */ | |
1028 | ||
1029 | spin_lock_init(&po->bind_lock); | |
1030 | po->prot_hook.func = packet_rcv; | |
1031 | #ifdef CONFIG_SOCK_PACKET | |
1032 | if (sock->type == SOCK_PACKET) | |
1033 | po->prot_hook.func = packet_rcv_spkt; | |
1034 | #endif | |
1035 | po->prot_hook.af_packet_priv = sk; | |
1036 | ||
1037 | if (protocol) { | |
1038 | po->prot_hook.type = protocol; | |
1039 | dev_add_pack(&po->prot_hook); | |
1040 | sock_hold(sk); | |
1041 | po->running = 1; | |
1042 | } | |
1043 | ||
1044 | write_lock_bh(&packet_sklist_lock); | |
1045 | sk_add_node(sk, &packet_sklist); | |
1046 | write_unlock_bh(&packet_sklist_lock); | |
1047 | return(0); | |
1048 | out: | |
1049 | return err; | |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * Pull a packet from our receive queue and hand it to the user. | |
1054 | * If necessary we block. | |
1055 | */ | |
1056 | ||
1057 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1058 | struct msghdr *msg, size_t len, int flags) | |
1059 | { | |
1060 | struct sock *sk = sock->sk; | |
1061 | struct sk_buff *skb; | |
1062 | int copied, err; | |
0fb375fb | 1063 | struct sockaddr_ll *sll; |
1da177e4 LT |
1064 | |
1065 | err = -EINVAL; | |
1066 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) | |
1067 | goto out; | |
1068 | ||
1069 | #if 0 | |
1070 | /* What error should we return now? EUNATTACH? */ | |
1071 | if (pkt_sk(sk)->ifindex < 0) | |
1072 | return -ENODEV; | |
1073 | #endif | |
1074 | ||
1da177e4 LT |
1075 | /* |
1076 | * Call the generic datagram receiver. This handles all sorts | |
1077 | * of horrible races and re-entrancy so we can forget about it | |
1078 | * in the protocol layers. | |
1079 | * | |
1080 | * Now it will return ENETDOWN, if device have just gone down, | |
1081 | * but then it will block. | |
1082 | */ | |
1083 | ||
1084 | skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&err); | |
1085 | ||
1086 | /* | |
1087 | * An error occurred so return it. Because skb_recv_datagram() | |
1088 | * handles the blocking we don't see and worry about blocking | |
1089 | * retries. | |
1090 | */ | |
1091 | ||
8ae55f04 | 1092 | if (skb == NULL) |
1da177e4 LT |
1093 | goto out; |
1094 | ||
0fb375fb EB |
1095 | /* |
1096 | * If the address length field is there to be filled in, we fill | |
1097 | * it in now. | |
1098 | */ | |
1099 | ||
1100 | sll = (struct sockaddr_ll*)skb->cb; | |
1101 | if (sock->type == SOCK_PACKET) | |
1102 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
1103 | else | |
1104 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); | |
1105 | ||
1da177e4 LT |
1106 | /* |
1107 | * You lose any data beyond the buffer you gave. If it worries a | |
1108 | * user program they can ask the device for its MTU anyway. | |
1109 | */ | |
1110 | ||
1111 | copied = skb->len; | |
1112 | if (copied > len) | |
1113 | { | |
1114 | copied=len; | |
1115 | msg->msg_flags|=MSG_TRUNC; | |
1116 | } | |
1117 | ||
1118 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1119 | if (err) | |
1120 | goto out_free; | |
1121 | ||
1122 | sock_recv_timestamp(msg, sk, skb); | |
1123 | ||
1124 | if (msg->msg_name) | |
1125 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
1126 | ||
1127 | /* | |
1128 | * Free or return the buffer as appropriate. Again this | |
1129 | * hides all the races and re-entrancy issues from us. | |
1130 | */ | |
1131 | err = (flags&MSG_TRUNC) ? skb->len : copied; | |
1132 | ||
1133 | out_free: | |
1134 | skb_free_datagram(sk, skb); | |
1135 | out: | |
1136 | return err; | |
1137 | } | |
1138 | ||
1139 | #ifdef CONFIG_SOCK_PACKET | |
1140 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, | |
1141 | int *uaddr_len, int peer) | |
1142 | { | |
1143 | struct net_device *dev; | |
1144 | struct sock *sk = sock->sk; | |
1145 | ||
1146 | if (peer) | |
1147 | return -EOPNOTSUPP; | |
1148 | ||
1149 | uaddr->sa_family = AF_PACKET; | |
1150 | dev = dev_get_by_index(pkt_sk(sk)->ifindex); | |
1151 | if (dev) { | |
1152 | strlcpy(uaddr->sa_data, dev->name, 15); | |
1153 | dev_put(dev); | |
1154 | } else | |
1155 | memset(uaddr->sa_data, 0, 14); | |
1156 | *uaddr_len = sizeof(*uaddr); | |
1157 | ||
1158 | return 0; | |
1159 | } | |
1160 | #endif | |
1161 | ||
1162 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
1163 | int *uaddr_len, int peer) | |
1164 | { | |
1165 | struct net_device *dev; | |
1166 | struct sock *sk = sock->sk; | |
1167 | struct packet_sock *po = pkt_sk(sk); | |
1168 | struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; | |
1169 | ||
1170 | if (peer) | |
1171 | return -EOPNOTSUPP; | |
1172 | ||
1173 | sll->sll_family = AF_PACKET; | |
1174 | sll->sll_ifindex = po->ifindex; | |
1175 | sll->sll_protocol = po->num; | |
1176 | dev = dev_get_by_index(po->ifindex); | |
1177 | if (dev) { | |
1178 | sll->sll_hatype = dev->type; | |
1179 | sll->sll_halen = dev->addr_len; | |
1180 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1181 | dev_put(dev); | |
1182 | } else { | |
1183 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
1184 | sll->sll_halen = 0; | |
1185 | } | |
0fb375fb | 1186 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
1187 | |
1188 | return 0; | |
1189 | } | |
1190 | ||
1191 | #ifdef CONFIG_PACKET_MULTICAST | |
1192 | static void packet_dev_mc(struct net_device *dev, struct packet_mclist *i, int what) | |
1193 | { | |
1194 | switch (i->type) { | |
1195 | case PACKET_MR_MULTICAST: | |
1196 | if (what > 0) | |
1197 | dev_mc_add(dev, i->addr, i->alen, 0); | |
1198 | else | |
1199 | dev_mc_delete(dev, i->addr, i->alen, 0); | |
1200 | break; | |
1201 | case PACKET_MR_PROMISC: | |
1202 | dev_set_promiscuity(dev, what); | |
1203 | break; | |
1204 | case PACKET_MR_ALLMULTI: | |
1205 | dev_set_allmulti(dev, what); | |
1206 | break; | |
1207 | default:; | |
1208 | } | |
1209 | } | |
1210 | ||
1211 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
1212 | { | |
1213 | for ( ; i; i=i->next) { | |
1214 | if (i->ifindex == dev->ifindex) | |
1215 | packet_dev_mc(dev, i, what); | |
1216 | } | |
1217 | } | |
1218 | ||
0fb375fb | 1219 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1220 | { |
1221 | struct packet_sock *po = pkt_sk(sk); | |
1222 | struct packet_mclist *ml, *i; | |
1223 | struct net_device *dev; | |
1224 | int err; | |
1225 | ||
1226 | rtnl_lock(); | |
1227 | ||
1228 | err = -ENODEV; | |
1229 | dev = __dev_get_by_index(mreq->mr_ifindex); | |
1230 | if (!dev) | |
1231 | goto done; | |
1232 | ||
1233 | err = -EINVAL; | |
1234 | if (mreq->mr_alen > dev->addr_len) | |
1235 | goto done; | |
1236 | ||
1237 | err = -ENOBUFS; | |
8b3a7005 | 1238 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
1239 | if (i == NULL) |
1240 | goto done; | |
1241 | ||
1242 | err = 0; | |
1243 | for (ml = po->mclist; ml; ml = ml->next) { | |
1244 | if (ml->ifindex == mreq->mr_ifindex && | |
1245 | ml->type == mreq->mr_type && | |
1246 | ml->alen == mreq->mr_alen && | |
1247 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1248 | ml->count++; | |
1249 | /* Free the new element ... */ | |
1250 | kfree(i); | |
1251 | goto done; | |
1252 | } | |
1253 | } | |
1254 | ||
1255 | i->type = mreq->mr_type; | |
1256 | i->ifindex = mreq->mr_ifindex; | |
1257 | i->alen = mreq->mr_alen; | |
1258 | memcpy(i->addr, mreq->mr_address, i->alen); | |
1259 | i->count = 1; | |
1260 | i->next = po->mclist; | |
1261 | po->mclist = i; | |
1262 | packet_dev_mc(dev, i, +1); | |
1263 | ||
1264 | done: | |
1265 | rtnl_unlock(); | |
1266 | return err; | |
1267 | } | |
1268 | ||
0fb375fb | 1269 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1270 | { |
1271 | struct packet_mclist *ml, **mlp; | |
1272 | ||
1273 | rtnl_lock(); | |
1274 | ||
1275 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
1276 | if (ml->ifindex == mreq->mr_ifindex && | |
1277 | ml->type == mreq->mr_type && | |
1278 | ml->alen == mreq->mr_alen && | |
1279 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1280 | if (--ml->count == 0) { | |
1281 | struct net_device *dev; | |
1282 | *mlp = ml->next; | |
1283 | dev = dev_get_by_index(ml->ifindex); | |
1284 | if (dev) { | |
1285 | packet_dev_mc(dev, ml, -1); | |
1286 | dev_put(dev); | |
1287 | } | |
1288 | kfree(ml); | |
1289 | } | |
1290 | rtnl_unlock(); | |
1291 | return 0; | |
1292 | } | |
1293 | } | |
1294 | rtnl_unlock(); | |
1295 | return -EADDRNOTAVAIL; | |
1296 | } | |
1297 | ||
1298 | static void packet_flush_mclist(struct sock *sk) | |
1299 | { | |
1300 | struct packet_sock *po = pkt_sk(sk); | |
1301 | struct packet_mclist *ml; | |
1302 | ||
1303 | if (!po->mclist) | |
1304 | return; | |
1305 | ||
1306 | rtnl_lock(); | |
1307 | while ((ml = po->mclist) != NULL) { | |
1308 | struct net_device *dev; | |
1309 | ||
1310 | po->mclist = ml->next; | |
1311 | if ((dev = dev_get_by_index(ml->ifindex)) != NULL) { | |
1312 | packet_dev_mc(dev, ml, -1); | |
1313 | dev_put(dev); | |
1314 | } | |
1315 | kfree(ml); | |
1316 | } | |
1317 | rtnl_unlock(); | |
1318 | } | |
1319 | #endif | |
1320 | ||
1321 | static int | |
1322 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) | |
1323 | { | |
1324 | struct sock *sk = sock->sk; | |
1325 | int ret; | |
1326 | ||
1327 | if (level != SOL_PACKET) | |
1328 | return -ENOPROTOOPT; | |
1329 | ||
1330 | switch(optname) { | |
1331 | #ifdef CONFIG_PACKET_MULTICAST | |
1332 | case PACKET_ADD_MEMBERSHIP: | |
1333 | case PACKET_DROP_MEMBERSHIP: | |
1334 | { | |
0fb375fb EB |
1335 | struct packet_mreq_max mreq; |
1336 | int len = optlen; | |
1337 | memset(&mreq, 0, sizeof(mreq)); | |
1338 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 1339 | return -EINVAL; |
0fb375fb EB |
1340 | if (len > sizeof(mreq)) |
1341 | len = sizeof(mreq); | |
1342 | if (copy_from_user(&mreq,optval,len)) | |
1da177e4 | 1343 | return -EFAULT; |
0fb375fb EB |
1344 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
1345 | return -EINVAL; | |
1da177e4 LT |
1346 | if (optname == PACKET_ADD_MEMBERSHIP) |
1347 | ret = packet_mc_add(sk, &mreq); | |
1348 | else | |
1349 | ret = packet_mc_drop(sk, &mreq); | |
1350 | return ret; | |
1351 | } | |
1352 | #endif | |
1353 | #ifdef CONFIG_PACKET_MMAP | |
1354 | case PACKET_RX_RING: | |
1355 | { | |
1356 | struct tpacket_req req; | |
1357 | ||
1358 | if (optlen<sizeof(req)) | |
1359 | return -EINVAL; | |
1360 | if (copy_from_user(&req,optval,sizeof(req))) | |
1361 | return -EFAULT; | |
1362 | return packet_set_ring(sk, &req, 0); | |
1363 | } | |
1364 | case PACKET_COPY_THRESH: | |
1365 | { | |
1366 | int val; | |
1367 | ||
1368 | if (optlen!=sizeof(val)) | |
1369 | return -EINVAL; | |
1370 | if (copy_from_user(&val,optval,sizeof(val))) | |
1371 | return -EFAULT; | |
1372 | ||
1373 | pkt_sk(sk)->copy_thresh = val; | |
1374 | return 0; | |
1375 | } | |
1376 | #endif | |
1377 | default: | |
1378 | return -ENOPROTOOPT; | |
1379 | } | |
1380 | } | |
1381 | ||
1382 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
1383 | char __user *optval, int __user *optlen) | |
1384 | { | |
1385 | int len; | |
1386 | struct sock *sk = sock->sk; | |
1387 | struct packet_sock *po = pkt_sk(sk); | |
1388 | ||
1389 | if (level != SOL_PACKET) | |
1390 | return -ENOPROTOOPT; | |
1391 | ||
8ae55f04 KK |
1392 | if (get_user(len, optlen)) |
1393 | return -EFAULT; | |
1da177e4 LT |
1394 | |
1395 | if (len < 0) | |
1396 | return -EINVAL; | |
1397 | ||
1398 | switch(optname) { | |
1399 | case PACKET_STATISTICS: | |
1400 | { | |
1401 | struct tpacket_stats st; | |
1402 | ||
1403 | if (len > sizeof(struct tpacket_stats)) | |
1404 | len = sizeof(struct tpacket_stats); | |
1405 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1406 | st = po->stats; | |
1407 | memset(&po->stats, 0, sizeof(st)); | |
1408 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1409 | st.tp_packets += st.tp_drops; | |
1410 | ||
1411 | if (copy_to_user(optval, &st, len)) | |
1412 | return -EFAULT; | |
1413 | break; | |
1414 | } | |
1415 | default: | |
1416 | return -ENOPROTOOPT; | |
1417 | } | |
1418 | ||
8ae55f04 KK |
1419 | if (put_user(len, optlen)) |
1420 | return -EFAULT; | |
1421 | return 0; | |
1da177e4 LT |
1422 | } |
1423 | ||
1424 | ||
1425 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) | |
1426 | { | |
1427 | struct sock *sk; | |
1428 | struct hlist_node *node; | |
1429 | struct net_device *dev = (struct net_device*)data; | |
1430 | ||
1431 | read_lock(&packet_sklist_lock); | |
1432 | sk_for_each(sk, node, &packet_sklist) { | |
1433 | struct packet_sock *po = pkt_sk(sk); | |
1434 | ||
1435 | switch (msg) { | |
1436 | case NETDEV_UNREGISTER: | |
1437 | #ifdef CONFIG_PACKET_MULTICAST | |
1438 | if (po->mclist) | |
1439 | packet_dev_mclist(dev, po->mclist, -1); | |
1440 | // fallthrough | |
1441 | #endif | |
1442 | case NETDEV_DOWN: | |
1443 | if (dev->ifindex == po->ifindex) { | |
1444 | spin_lock(&po->bind_lock); | |
1445 | if (po->running) { | |
1446 | __dev_remove_pack(&po->prot_hook); | |
1447 | __sock_put(sk); | |
1448 | po->running = 0; | |
1449 | sk->sk_err = ENETDOWN; | |
1450 | if (!sock_flag(sk, SOCK_DEAD)) | |
1451 | sk->sk_error_report(sk); | |
1452 | } | |
1453 | if (msg == NETDEV_UNREGISTER) { | |
1454 | po->ifindex = -1; | |
1455 | po->prot_hook.dev = NULL; | |
1456 | } | |
1457 | spin_unlock(&po->bind_lock); | |
1458 | } | |
1459 | break; | |
1460 | case NETDEV_UP: | |
1461 | spin_lock(&po->bind_lock); | |
1462 | if (dev->ifindex == po->ifindex && po->num && | |
1463 | !po->running) { | |
1464 | dev_add_pack(&po->prot_hook); | |
1465 | sock_hold(sk); | |
1466 | po->running = 1; | |
1467 | } | |
1468 | spin_unlock(&po->bind_lock); | |
1469 | break; | |
1470 | } | |
1471 | } | |
1472 | read_unlock(&packet_sklist_lock); | |
1473 | return NOTIFY_DONE; | |
1474 | } | |
1475 | ||
1476 | ||
1477 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
1478 | unsigned long arg) | |
1479 | { | |
1480 | struct sock *sk = sock->sk; | |
1481 | ||
1482 | switch(cmd) { | |
1483 | case SIOCOUTQ: | |
1484 | { | |
1485 | int amount = atomic_read(&sk->sk_wmem_alloc); | |
1486 | return put_user(amount, (int __user *)arg); | |
1487 | } | |
1488 | case SIOCINQ: | |
1489 | { | |
1490 | struct sk_buff *skb; | |
1491 | int amount = 0; | |
1492 | ||
1493 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1494 | skb = skb_peek(&sk->sk_receive_queue); | |
1495 | if (skb) | |
1496 | amount = skb->len; | |
1497 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1498 | return put_user(amount, (int __user *)arg); | |
1499 | } | |
1500 | case SIOCGSTAMP: | |
1501 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
1502 | ||
1503 | #ifdef CONFIG_INET | |
1504 | case SIOCADDRT: | |
1505 | case SIOCDELRT: | |
1506 | case SIOCDARP: | |
1507 | case SIOCGARP: | |
1508 | case SIOCSARP: | |
1509 | case SIOCGIFADDR: | |
1510 | case SIOCSIFADDR: | |
1511 | case SIOCGIFBRDADDR: | |
1512 | case SIOCSIFBRDADDR: | |
1513 | case SIOCGIFNETMASK: | |
1514 | case SIOCSIFNETMASK: | |
1515 | case SIOCGIFDSTADDR: | |
1516 | case SIOCSIFDSTADDR: | |
1517 | case SIOCSIFFLAGS: | |
1518 | return inet_dgram_ops.ioctl(sock, cmd, arg); | |
1519 | #endif | |
1520 | ||
1521 | default: | |
b5e5fa5e | 1522 | return -ENOIOCTLCMD; |
1da177e4 LT |
1523 | } |
1524 | return 0; | |
1525 | } | |
1526 | ||
1527 | #ifndef CONFIG_PACKET_MMAP | |
1528 | #define packet_mmap sock_no_mmap | |
1529 | #define packet_poll datagram_poll | |
1530 | #else | |
1531 | ||
1532 | static unsigned int packet_poll(struct file * file, struct socket *sock, | |
1533 | poll_table *wait) | |
1534 | { | |
1535 | struct sock *sk = sock->sk; | |
1536 | struct packet_sock *po = pkt_sk(sk); | |
1537 | unsigned int mask = datagram_poll(file, sock, wait); | |
1538 | ||
1539 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1540 | if (po->pg_vec) { | |
1541 | unsigned last = po->head ? po->head-1 : po->frame_max; | |
1542 | struct tpacket_hdr *h; | |
1543 | ||
1544 | h = (struct tpacket_hdr *)packet_lookup_frame(po, last); | |
1545 | ||
1546 | if (h->tp_status) | |
1547 | mask |= POLLIN | POLLRDNORM; | |
1548 | } | |
1549 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1550 | return mask; | |
1551 | } | |
1552 | ||
1553 | ||
1554 | /* Dirty? Well, I still did not learn better way to account | |
1555 | * for user mmaps. | |
1556 | */ | |
1557 | ||
1558 | static void packet_mm_open(struct vm_area_struct *vma) | |
1559 | { | |
1560 | struct file *file = vma->vm_file; | |
b69aee04 | 1561 | struct socket * sock = file->private_data; |
1da177e4 LT |
1562 | struct sock *sk = sock->sk; |
1563 | ||
1564 | if (sk) | |
1565 | atomic_inc(&pkt_sk(sk)->mapped); | |
1566 | } | |
1567 | ||
1568 | static void packet_mm_close(struct vm_area_struct *vma) | |
1569 | { | |
1570 | struct file *file = vma->vm_file; | |
b69aee04 | 1571 | struct socket * sock = file->private_data; |
1da177e4 LT |
1572 | struct sock *sk = sock->sk; |
1573 | ||
1574 | if (sk) | |
1575 | atomic_dec(&pkt_sk(sk)->mapped); | |
1576 | } | |
1577 | ||
1578 | static struct vm_operations_struct packet_mmap_ops = { | |
1579 | .open = packet_mm_open, | |
1580 | .close =packet_mm_close, | |
1581 | }; | |
1582 | ||
1583 | static inline struct page *pg_vec_endpage(char *one_pg_vec, unsigned int order) | |
1584 | { | |
1585 | return virt_to_page(one_pg_vec + (PAGE_SIZE << order) - 1); | |
1586 | } | |
1587 | ||
4ebf0ae2 | 1588 | static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len) |
1da177e4 LT |
1589 | { |
1590 | int i; | |
1591 | ||
4ebf0ae2 DM |
1592 | for (i = 0; i < len; i++) { |
1593 | if (likely(pg_vec[i])) | |
1594 | free_pages((unsigned long) pg_vec[i], order); | |
1da177e4 LT |
1595 | } |
1596 | kfree(pg_vec); | |
1597 | } | |
1598 | ||
4ebf0ae2 DM |
1599 | static inline char *alloc_one_pg_vec_page(unsigned long order) |
1600 | { | |
1601 | return (char *) __get_free_pages(GFP_KERNEL | __GFP_COMP | __GFP_ZERO, | |
1602 | order); | |
1603 | } | |
1604 | ||
1605 | static char **alloc_pg_vec(struct tpacket_req *req, int order) | |
1606 | { | |
1607 | unsigned int block_nr = req->tp_block_nr; | |
1608 | char **pg_vec; | |
1609 | int i; | |
1610 | ||
1611 | pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL); | |
1612 | if (unlikely(!pg_vec)) | |
1613 | goto out; | |
1614 | ||
1615 | for (i = 0; i < block_nr; i++) { | |
1616 | pg_vec[i] = alloc_one_pg_vec_page(order); | |
1617 | if (unlikely(!pg_vec[i])) | |
1618 | goto out_free_pgvec; | |
1619 | } | |
1620 | ||
1621 | out: | |
1622 | return pg_vec; | |
1623 | ||
1624 | out_free_pgvec: | |
1625 | free_pg_vec(pg_vec, order, block_nr); | |
1626 | pg_vec = NULL; | |
1627 | goto out; | |
1628 | } | |
1da177e4 LT |
1629 | |
1630 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing) | |
1631 | { | |
1632 | char **pg_vec = NULL; | |
1633 | struct packet_sock *po = pkt_sk(sk); | |
1634 | int was_running, num, order = 0; | |
1635 | int err = 0; | |
1636 | ||
1637 | if (req->tp_block_nr) { | |
1638 | int i, l; | |
1639 | ||
1640 | /* Sanity tests and some calculations */ | |
1641 | ||
4ebf0ae2 | 1642 | if (unlikely(po->pg_vec)) |
1da177e4 LT |
1643 | return -EBUSY; |
1644 | ||
4ebf0ae2 | 1645 | if (unlikely((int)req->tp_block_size <= 0)) |
1da177e4 | 1646 | return -EINVAL; |
4ebf0ae2 | 1647 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
1da177e4 | 1648 | return -EINVAL; |
4ebf0ae2 | 1649 | if (unlikely(req->tp_frame_size < TPACKET_HDRLEN)) |
1da177e4 | 1650 | return -EINVAL; |
4ebf0ae2 | 1651 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
1da177e4 LT |
1652 | return -EINVAL; |
1653 | ||
1654 | po->frames_per_block = req->tp_block_size/req->tp_frame_size; | |
4ebf0ae2 | 1655 | if (unlikely(po->frames_per_block <= 0)) |
1da177e4 | 1656 | return -EINVAL; |
4ebf0ae2 DM |
1657 | if (unlikely((po->frames_per_block * req->tp_block_nr) != |
1658 | req->tp_frame_nr)) | |
1da177e4 | 1659 | return -EINVAL; |
1da177e4 LT |
1660 | |
1661 | err = -ENOMEM; | |
4ebf0ae2 DM |
1662 | order = get_order(req->tp_block_size); |
1663 | pg_vec = alloc_pg_vec(req, order); | |
1664 | if (unlikely(!pg_vec)) | |
1da177e4 | 1665 | goto out; |
1da177e4 LT |
1666 | |
1667 | l = 0; | |
4ebf0ae2 | 1668 | for (i = 0; i < req->tp_block_nr; i++) { |
1da177e4 LT |
1669 | char *ptr = pg_vec[i]; |
1670 | struct tpacket_hdr *header; | |
1671 | int k; | |
1672 | ||
4ebf0ae2 DM |
1673 | for (k = 0; k < po->frames_per_block; k++) { |
1674 | header = (struct tpacket_hdr *) ptr; | |
1da177e4 LT |
1675 | header->tp_status = TP_STATUS_KERNEL; |
1676 | ptr += req->tp_frame_size; | |
1677 | } | |
1678 | } | |
1679 | /* Done */ | |
1680 | } else { | |
4ebf0ae2 | 1681 | if (unlikely(req->tp_frame_nr)) |
1da177e4 LT |
1682 | return -EINVAL; |
1683 | } | |
1684 | ||
1685 | lock_sock(sk); | |
1686 | ||
1687 | /* Detach socket from network */ | |
1688 | spin_lock(&po->bind_lock); | |
1689 | was_running = po->running; | |
1690 | num = po->num; | |
1691 | if (was_running) { | |
1692 | __dev_remove_pack(&po->prot_hook); | |
1693 | po->num = 0; | |
1694 | po->running = 0; | |
1695 | __sock_put(sk); | |
1696 | } | |
1697 | spin_unlock(&po->bind_lock); | |
1698 | ||
1699 | synchronize_net(); | |
1700 | ||
1701 | err = -EBUSY; | |
1702 | if (closing || atomic_read(&po->mapped) == 0) { | |
1703 | err = 0; | |
1704 | #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) | |
1705 | ||
1706 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1707 | pg_vec = XC(po->pg_vec, pg_vec); | |
4ebf0ae2 | 1708 | po->frame_max = (req->tp_frame_nr - 1); |
1da177e4 LT |
1709 | po->head = 0; |
1710 | po->frame_size = req->tp_frame_size; | |
1711 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1712 | ||
1713 | order = XC(po->pg_vec_order, order); | |
1714 | req->tp_block_nr = XC(po->pg_vec_len, req->tp_block_nr); | |
1715 | ||
1716 | po->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
1717 | po->prot_hook.func = po->pg_vec ? tpacket_rcv : packet_rcv; | |
1718 | skb_queue_purge(&sk->sk_receive_queue); | |
1719 | #undef XC | |
1720 | if (atomic_read(&po->mapped)) | |
1721 | printk(KERN_DEBUG "packet_mmap: vma is busy: %d\n", atomic_read(&po->mapped)); | |
1722 | } | |
1723 | ||
1724 | spin_lock(&po->bind_lock); | |
1725 | if (was_running && !po->running) { | |
1726 | sock_hold(sk); | |
1727 | po->running = 1; | |
1728 | po->num = num; | |
1729 | dev_add_pack(&po->prot_hook); | |
1730 | } | |
1731 | spin_unlock(&po->bind_lock); | |
1732 | ||
1733 | release_sock(sk); | |
1734 | ||
1da177e4 LT |
1735 | if (pg_vec) |
1736 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
1737 | out: | |
1738 | return err; | |
1739 | } | |
1740 | ||
1741 | static int packet_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
1742 | { | |
1743 | struct sock *sk = sock->sk; | |
1744 | struct packet_sock *po = pkt_sk(sk); | |
1745 | unsigned long size; | |
1746 | unsigned long start; | |
1747 | int err = -EINVAL; | |
1748 | int i; | |
1749 | ||
1750 | if (vma->vm_pgoff) | |
1751 | return -EINVAL; | |
1752 | ||
1753 | size = vma->vm_end - vma->vm_start; | |
1754 | ||
1755 | lock_sock(sk); | |
1756 | if (po->pg_vec == NULL) | |
1757 | goto out; | |
1758 | if (size != po->pg_vec_len*po->pg_vec_pages*PAGE_SIZE) | |
1759 | goto out; | |
1760 | ||
1da177e4 | 1761 | start = vma->vm_start; |
4ebf0ae2 DM |
1762 | for (i = 0; i < po->pg_vec_len; i++) { |
1763 | struct page *page = virt_to_page(po->pg_vec[i]); | |
1764 | int pg_num; | |
1765 | ||
1766 | for (pg_num = 0; pg_num < po->pg_vec_pages; pg_num++, page++) { | |
1767 | err = vm_insert_page(vma, start, page); | |
1768 | if (unlikely(err)) | |
1769 | goto out; | |
1770 | start += PAGE_SIZE; | |
1771 | } | |
1da177e4 | 1772 | } |
4ebf0ae2 | 1773 | atomic_inc(&po->mapped); |
1da177e4 LT |
1774 | vma->vm_ops = &packet_mmap_ops; |
1775 | err = 0; | |
1776 | ||
1777 | out: | |
1778 | release_sock(sk); | |
1779 | return err; | |
1780 | } | |
1781 | #endif | |
1782 | ||
1783 | ||
1784 | #ifdef CONFIG_SOCK_PACKET | |
90ddc4f0 | 1785 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
1786 | .family = PF_PACKET, |
1787 | .owner = THIS_MODULE, | |
1788 | .release = packet_release, | |
1789 | .bind = packet_bind_spkt, | |
1790 | .connect = sock_no_connect, | |
1791 | .socketpair = sock_no_socketpair, | |
1792 | .accept = sock_no_accept, | |
1793 | .getname = packet_getname_spkt, | |
1794 | .poll = datagram_poll, | |
1795 | .ioctl = packet_ioctl, | |
1796 | .listen = sock_no_listen, | |
1797 | .shutdown = sock_no_shutdown, | |
1798 | .setsockopt = sock_no_setsockopt, | |
1799 | .getsockopt = sock_no_getsockopt, | |
1800 | .sendmsg = packet_sendmsg_spkt, | |
1801 | .recvmsg = packet_recvmsg, | |
1802 | .mmap = sock_no_mmap, | |
1803 | .sendpage = sock_no_sendpage, | |
1804 | }; | |
1805 | #endif | |
1806 | ||
90ddc4f0 | 1807 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
1808 | .family = PF_PACKET, |
1809 | .owner = THIS_MODULE, | |
1810 | .release = packet_release, | |
1811 | .bind = packet_bind, | |
1812 | .connect = sock_no_connect, | |
1813 | .socketpair = sock_no_socketpair, | |
1814 | .accept = sock_no_accept, | |
1815 | .getname = packet_getname, | |
1816 | .poll = packet_poll, | |
1817 | .ioctl = packet_ioctl, | |
1818 | .listen = sock_no_listen, | |
1819 | .shutdown = sock_no_shutdown, | |
1820 | .setsockopt = packet_setsockopt, | |
1821 | .getsockopt = packet_getsockopt, | |
1822 | .sendmsg = packet_sendmsg, | |
1823 | .recvmsg = packet_recvmsg, | |
1824 | .mmap = packet_mmap, | |
1825 | .sendpage = sock_no_sendpage, | |
1826 | }; | |
1827 | ||
1828 | static struct net_proto_family packet_family_ops = { | |
1829 | .family = PF_PACKET, | |
1830 | .create = packet_create, | |
1831 | .owner = THIS_MODULE, | |
1832 | }; | |
1833 | ||
1834 | static struct notifier_block packet_netdev_notifier = { | |
1835 | .notifier_call =packet_notifier, | |
1836 | }; | |
1837 | ||
1838 | #ifdef CONFIG_PROC_FS | |
1839 | static inline struct sock *packet_seq_idx(loff_t off) | |
1840 | { | |
1841 | struct sock *s; | |
1842 | struct hlist_node *node; | |
1843 | ||
1844 | sk_for_each(s, node, &packet_sklist) { | |
1845 | if (!off--) | |
1846 | return s; | |
1847 | } | |
1848 | return NULL; | |
1849 | } | |
1850 | ||
1851 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
1852 | { | |
1853 | read_lock(&packet_sklist_lock); | |
1854 | return *pos ? packet_seq_idx(*pos - 1) : SEQ_START_TOKEN; | |
1855 | } | |
1856 | ||
1857 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1858 | { | |
1859 | ++*pos; | |
1860 | return (v == SEQ_START_TOKEN) | |
1861 | ? sk_head(&packet_sklist) | |
1862 | : sk_next((struct sock*)v) ; | |
1863 | } | |
1864 | ||
1865 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
1866 | { | |
1867 | read_unlock(&packet_sklist_lock); | |
1868 | } | |
1869 | ||
1870 | static int packet_seq_show(struct seq_file *seq, void *v) | |
1871 | { | |
1872 | if (v == SEQ_START_TOKEN) | |
1873 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
1874 | else { | |
1875 | struct sock *s = v; | |
1876 | const struct packet_sock *po = pkt_sk(s); | |
1877 | ||
1878 | seq_printf(seq, | |
1879 | "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", | |
1880 | s, | |
1881 | atomic_read(&s->sk_refcnt), | |
1882 | s->sk_type, | |
1883 | ntohs(po->num), | |
1884 | po->ifindex, | |
1885 | po->running, | |
1886 | atomic_read(&s->sk_rmem_alloc), | |
1887 | sock_i_uid(s), | |
1888 | sock_i_ino(s) ); | |
1889 | } | |
1890 | ||
1891 | return 0; | |
1892 | } | |
1893 | ||
1894 | static struct seq_operations packet_seq_ops = { | |
1895 | .start = packet_seq_start, | |
1896 | .next = packet_seq_next, | |
1897 | .stop = packet_seq_stop, | |
1898 | .show = packet_seq_show, | |
1899 | }; | |
1900 | ||
1901 | static int packet_seq_open(struct inode *inode, struct file *file) | |
1902 | { | |
1903 | return seq_open(file, &packet_seq_ops); | |
1904 | } | |
1905 | ||
1906 | static struct file_operations packet_seq_fops = { | |
1907 | .owner = THIS_MODULE, | |
1908 | .open = packet_seq_open, | |
1909 | .read = seq_read, | |
1910 | .llseek = seq_lseek, | |
1911 | .release = seq_release, | |
1912 | }; | |
1913 | ||
1914 | #endif | |
1915 | ||
1916 | static void __exit packet_exit(void) | |
1917 | { | |
1918 | proc_net_remove("packet"); | |
1919 | unregister_netdevice_notifier(&packet_netdev_notifier); | |
1920 | sock_unregister(PF_PACKET); | |
1921 | proto_unregister(&packet_proto); | |
1922 | } | |
1923 | ||
1924 | static int __init packet_init(void) | |
1925 | { | |
1926 | int rc = proto_register(&packet_proto, 0); | |
1927 | ||
1928 | if (rc != 0) | |
1929 | goto out; | |
1930 | ||
1931 | sock_register(&packet_family_ops); | |
1932 | register_netdevice_notifier(&packet_netdev_notifier); | |
1933 | proc_net_fops_create("packet", 0, &packet_seq_fops); | |
1934 | out: | |
1935 | return rc; | |
1936 | } | |
1937 | ||
1938 | module_init(packet_init); | |
1939 | module_exit(packet_exit); | |
1940 | MODULE_LICENSE("GPL"); | |
1941 | MODULE_ALIAS_NETPROTO(PF_PACKET); |