]>
Commit | Line | Data |
---|---|---|
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 */ | |
0e11c91e | 204 | __be16 num; |
1da177e4 LT |
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; | |
0e11c91e | 334 | __be16 proto=0; |
1da177e4 LT |
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 | ||
fda9ef5d DM |
430 | static inline int run_filter(struct sk_buff *skb, struct sock *sk, |
431 | unsigned *snaplen) | |
1da177e4 LT |
432 | { |
433 | struct sk_filter *filter; | |
fda9ef5d DM |
434 | int err = 0; |
435 | ||
436 | rcu_read_lock_bh(); | |
437 | filter = rcu_dereference(sk->sk_filter); | |
438 | if (filter != NULL) { | |
439 | err = sk_run_filter(skb, filter->insns, filter->len); | |
440 | if (!err) | |
441 | err = -EPERM; | |
442 | else if (*snaplen > err) | |
443 | *snaplen = err; | |
444 | } | |
445 | rcu_read_unlock_bh(); | |
1da177e4 | 446 | |
fda9ef5d | 447 | return err; |
1da177e4 LT |
448 | } |
449 | ||
450 | /* | |
451 | This function makes lazy skb cloning in hope that most of packets | |
452 | are discarded by BPF. | |
453 | ||
454 | Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
455 | and skb->cb are mangled. It works because (and until) packets | |
456 | falling here are owned by current CPU. Output packets are cloned | |
457 | by dev_queue_xmit_nit(), input packets are processed by net_bh | |
458 | sequencially, so that if we return skb to original state on exit, | |
459 | we will not harm anyone. | |
460 | */ | |
461 | ||
f2ccd8fa | 462 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
463 | { |
464 | struct sock *sk; | |
465 | struct sockaddr_ll *sll; | |
466 | struct packet_sock *po; | |
467 | u8 * skb_head = skb->data; | |
468 | int skb_len = skb->len; | |
469 | unsigned snaplen; | |
470 | ||
471 | if (skb->pkt_type == PACKET_LOOPBACK) | |
472 | goto drop; | |
473 | ||
474 | sk = pt->af_packet_priv; | |
475 | po = pkt_sk(sk); | |
476 | ||
477 | skb->dev = dev; | |
478 | ||
479 | if (dev->hard_header) { | |
480 | /* The device has an explicit notion of ll header, | |
481 | exported to higher levels. | |
482 | ||
483 | Otherwise, the device hides datails of it frame | |
484 | structure, so that corresponding packet head | |
485 | never delivered to user. | |
486 | */ | |
487 | if (sk->sk_type != SOCK_DGRAM) | |
488 | skb_push(skb, skb->data - skb->mac.raw); | |
489 | else if (skb->pkt_type == PACKET_OUTGOING) { | |
490 | /* Special case: outgoing packets have ll header at head */ | |
491 | skb_pull(skb, skb->nh.raw - skb->data); | |
492 | } | |
493 | } | |
494 | ||
495 | snaplen = skb->len; | |
496 | ||
fda9ef5d DM |
497 | if (run_filter(skb, sk, &snaplen) < 0) |
498 | goto drop_n_restore; | |
1da177e4 LT |
499 | |
500 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
501 | (unsigned)sk->sk_rcvbuf) | |
502 | goto drop_n_acct; | |
503 | ||
504 | if (skb_shared(skb)) { | |
505 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
506 | if (nskb == NULL) | |
507 | goto drop_n_acct; | |
508 | ||
509 | if (skb_head != skb->data) { | |
510 | skb->data = skb_head; | |
511 | skb->len = skb_len; | |
512 | } | |
513 | kfree_skb(skb); | |
514 | skb = nskb; | |
515 | } | |
516 | ||
517 | sll = (struct sockaddr_ll*)skb->cb; | |
518 | sll->sll_family = AF_PACKET; | |
519 | sll->sll_hatype = dev->type; | |
520 | sll->sll_protocol = skb->protocol; | |
521 | sll->sll_pkttype = skb->pkt_type; | |
522 | sll->sll_ifindex = dev->ifindex; | |
523 | sll->sll_halen = 0; | |
524 | ||
525 | if (dev->hard_header_parse) | |
526 | sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); | |
527 | ||
528 | if (pskb_trim(skb, snaplen)) | |
529 | goto drop_n_acct; | |
530 | ||
531 | skb_set_owner_r(skb, sk); | |
532 | skb->dev = NULL; | |
533 | dst_release(skb->dst); | |
534 | skb->dst = NULL; | |
535 | ||
84531c24 PO |
536 | /* drop conntrack reference */ |
537 | nf_reset(skb); | |
538 | ||
1da177e4 LT |
539 | spin_lock(&sk->sk_receive_queue.lock); |
540 | po->stats.tp_packets++; | |
541 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
542 | spin_unlock(&sk->sk_receive_queue.lock); | |
543 | sk->sk_data_ready(sk, skb->len); | |
544 | return 0; | |
545 | ||
546 | drop_n_acct: | |
547 | spin_lock(&sk->sk_receive_queue.lock); | |
548 | po->stats.tp_drops++; | |
549 | spin_unlock(&sk->sk_receive_queue.lock); | |
550 | ||
551 | drop_n_restore: | |
552 | if (skb_head != skb->data && skb_shared(skb)) { | |
553 | skb->data = skb_head; | |
554 | skb->len = skb_len; | |
555 | } | |
556 | drop: | |
557 | kfree_skb(skb); | |
558 | return 0; | |
559 | } | |
560 | ||
561 | #ifdef CONFIG_PACKET_MMAP | |
f2ccd8fa | 562 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
563 | { |
564 | struct sock *sk; | |
565 | struct packet_sock *po; | |
566 | struct sockaddr_ll *sll; | |
567 | struct tpacket_hdr *h; | |
568 | u8 * skb_head = skb->data; | |
569 | int skb_len = skb->len; | |
570 | unsigned snaplen; | |
571 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; | |
572 | unsigned short macoff, netoff; | |
573 | struct sk_buff *copy_skb = NULL; | |
574 | ||
575 | if (skb->pkt_type == PACKET_LOOPBACK) | |
576 | goto drop; | |
577 | ||
578 | sk = pt->af_packet_priv; | |
579 | po = pkt_sk(sk); | |
580 | ||
581 | if (dev->hard_header) { | |
582 | if (sk->sk_type != SOCK_DGRAM) | |
583 | skb_push(skb, skb->data - skb->mac.raw); | |
584 | else if (skb->pkt_type == PACKET_OUTGOING) { | |
585 | /* Special case: outgoing packets have ll header at head */ | |
586 | skb_pull(skb, skb->nh.raw - skb->data); | |
84fa7933 | 587 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
1da177e4 LT |
588 | status |= TP_STATUS_CSUMNOTREADY; |
589 | } | |
590 | } | |
591 | ||
592 | snaplen = skb->len; | |
593 | ||
fda9ef5d DM |
594 | if (run_filter(skb, sk, &snaplen) < 0) |
595 | goto drop_n_restore; | |
1da177e4 LT |
596 | |
597 | if (sk->sk_type == SOCK_DGRAM) { | |
598 | macoff = netoff = TPACKET_ALIGN(TPACKET_HDRLEN) + 16; | |
599 | } else { | |
600 | unsigned maclen = skb->nh.raw - skb->data; | |
601 | netoff = TPACKET_ALIGN(TPACKET_HDRLEN + (maclen < 16 ? 16 : maclen)); | |
602 | macoff = netoff - maclen; | |
603 | } | |
604 | ||
605 | if (macoff + snaplen > po->frame_size) { | |
606 | if (po->copy_thresh && | |
607 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < | |
608 | (unsigned)sk->sk_rcvbuf) { | |
609 | if (skb_shared(skb)) { | |
610 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
611 | } else { | |
612 | copy_skb = skb_get(skb); | |
613 | skb_head = skb->data; | |
614 | } | |
615 | if (copy_skb) | |
616 | skb_set_owner_r(copy_skb, sk); | |
617 | } | |
618 | snaplen = po->frame_size - macoff; | |
619 | if ((int)snaplen < 0) | |
620 | snaplen = 0; | |
621 | } | |
1da177e4 LT |
622 | |
623 | spin_lock(&sk->sk_receive_queue.lock); | |
624 | h = (struct tpacket_hdr *)packet_lookup_frame(po, po->head); | |
625 | ||
626 | if (h->tp_status) | |
627 | goto ring_is_full; | |
628 | po->head = po->head != po->frame_max ? po->head+1 : 0; | |
629 | po->stats.tp_packets++; | |
630 | if (copy_skb) { | |
631 | status |= TP_STATUS_COPY; | |
632 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
633 | } | |
634 | if (!po->stats.tp_drops) | |
635 | status &= ~TP_STATUS_LOSING; | |
636 | spin_unlock(&sk->sk_receive_queue.lock); | |
637 | ||
cbe21d8f | 638 | skb_copy_bits(skb, 0, (u8*)h + macoff, snaplen); |
1da177e4 LT |
639 | |
640 | h->tp_len = skb->len; | |
641 | h->tp_snaplen = snaplen; | |
642 | h->tp_mac = macoff; | |
643 | h->tp_net = netoff; | |
a61bbcf2 PM |
644 | if (skb->tstamp.off_sec == 0) { |
645 | __net_timestamp(skb); | |
1da177e4 LT |
646 | sock_enable_timestamp(sk); |
647 | } | |
325ed823 HX |
648 | h->tp_sec = skb->tstamp.off_sec; |
649 | h->tp_usec = skb->tstamp.off_usec; | |
1da177e4 LT |
650 | |
651 | sll = (struct sockaddr_ll*)((u8*)h + TPACKET_ALIGN(sizeof(*h))); | |
652 | sll->sll_halen = 0; | |
653 | if (dev->hard_header_parse) | |
654 | sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); | |
655 | sll->sll_family = AF_PACKET; | |
656 | sll->sll_hatype = dev->type; | |
657 | sll->sll_protocol = skb->protocol; | |
658 | sll->sll_pkttype = skb->pkt_type; | |
659 | sll->sll_ifindex = dev->ifindex; | |
660 | ||
661 | h->tp_status = status; | |
662 | mb(); | |
663 | ||
664 | { | |
665 | struct page *p_start, *p_end; | |
666 | u8 *h_end = (u8 *)h + macoff + snaplen - 1; | |
667 | ||
668 | p_start = virt_to_page(h); | |
669 | p_end = virt_to_page(h_end); | |
670 | while (p_start <= p_end) { | |
671 | flush_dcache_page(p_start); | |
672 | p_start++; | |
673 | } | |
674 | } | |
675 | ||
676 | sk->sk_data_ready(sk, 0); | |
677 | ||
678 | drop_n_restore: | |
679 | if (skb_head != skb->data && skb_shared(skb)) { | |
680 | skb->data = skb_head; | |
681 | skb->len = skb_len; | |
682 | } | |
683 | drop: | |
684 | kfree_skb(skb); | |
685 | return 0; | |
686 | ||
687 | ring_is_full: | |
688 | po->stats.tp_drops++; | |
689 | spin_unlock(&sk->sk_receive_queue.lock); | |
690 | ||
691 | sk->sk_data_ready(sk, 0); | |
692 | if (copy_skb) | |
693 | kfree_skb(copy_skb); | |
694 | goto drop_n_restore; | |
695 | } | |
696 | ||
697 | #endif | |
698 | ||
699 | ||
700 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, | |
701 | struct msghdr *msg, size_t len) | |
702 | { | |
703 | struct sock *sk = sock->sk; | |
704 | struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name; | |
705 | struct sk_buff *skb; | |
706 | struct net_device *dev; | |
0e11c91e | 707 | __be16 proto; |
1da177e4 LT |
708 | unsigned char *addr; |
709 | int ifindex, err, reserve = 0; | |
710 | ||
711 | /* | |
712 | * Get and verify the address. | |
713 | */ | |
714 | ||
715 | if (saddr == NULL) { | |
716 | struct packet_sock *po = pkt_sk(sk); | |
717 | ||
718 | ifindex = po->ifindex; | |
719 | proto = po->num; | |
720 | addr = NULL; | |
721 | } else { | |
722 | err = -EINVAL; | |
723 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
724 | goto out; | |
0fb375fb EB |
725 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
726 | goto out; | |
1da177e4 LT |
727 | ifindex = saddr->sll_ifindex; |
728 | proto = saddr->sll_protocol; | |
729 | addr = saddr->sll_addr; | |
730 | } | |
731 | ||
732 | ||
733 | dev = dev_get_by_index(ifindex); | |
734 | err = -ENXIO; | |
735 | if (dev == NULL) | |
736 | goto out_unlock; | |
737 | if (sock->type == SOCK_RAW) | |
738 | reserve = dev->hard_header_len; | |
739 | ||
740 | err = -EMSGSIZE; | |
741 | if (len > dev->mtu+reserve) | |
742 | goto out_unlock; | |
743 | ||
744 | skb = sock_alloc_send_skb(sk, len + LL_RESERVED_SPACE(dev), | |
745 | msg->msg_flags & MSG_DONTWAIT, &err); | |
746 | if (skb==NULL) | |
747 | goto out_unlock; | |
748 | ||
749 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
750 | skb->nh.raw = skb->data; | |
751 | ||
752 | if (dev->hard_header) { | |
753 | int res; | |
754 | err = -EINVAL; | |
755 | res = dev->hard_header(skb, dev, ntohs(proto), addr, NULL, len); | |
756 | if (sock->type != SOCK_DGRAM) { | |
757 | skb->tail = skb->data; | |
758 | skb->len = 0; | |
759 | } else if (res < 0) | |
760 | goto out_free; | |
761 | } | |
762 | ||
763 | /* Returns -EFAULT on error */ | |
764 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); | |
765 | if (err) | |
766 | goto out_free; | |
767 | ||
768 | skb->protocol = proto; | |
769 | skb->dev = dev; | |
770 | skb->priority = sk->sk_priority; | |
771 | ||
772 | err = -ENETDOWN; | |
773 | if (!(dev->flags & IFF_UP)) | |
774 | goto out_free; | |
775 | ||
776 | /* | |
777 | * Now send it | |
778 | */ | |
779 | ||
780 | err = dev_queue_xmit(skb); | |
781 | if (err > 0 && (err = net_xmit_errno(err)) != 0) | |
782 | goto out_unlock; | |
783 | ||
784 | dev_put(dev); | |
785 | ||
786 | return(len); | |
787 | ||
788 | out_free: | |
789 | kfree_skb(skb); | |
790 | out_unlock: | |
791 | if (dev) | |
792 | dev_put(dev); | |
793 | out: | |
794 | return err; | |
795 | } | |
796 | ||
797 | /* | |
798 | * Close a PACKET socket. This is fairly simple. We immediately go | |
799 | * to 'closed' state and remove our protocol entry in the device list. | |
800 | */ | |
801 | ||
802 | static int packet_release(struct socket *sock) | |
803 | { | |
804 | struct sock *sk = sock->sk; | |
805 | struct packet_sock *po; | |
806 | ||
807 | if (!sk) | |
808 | return 0; | |
809 | ||
810 | po = pkt_sk(sk); | |
811 | ||
812 | write_lock_bh(&packet_sklist_lock); | |
813 | sk_del_node_init(sk); | |
814 | write_unlock_bh(&packet_sklist_lock); | |
815 | ||
816 | /* | |
817 | * Unhook packet receive handler. | |
818 | */ | |
819 | ||
820 | if (po->running) { | |
821 | /* | |
822 | * Remove the protocol hook | |
823 | */ | |
824 | dev_remove_pack(&po->prot_hook); | |
825 | po->running = 0; | |
826 | po->num = 0; | |
827 | __sock_put(sk); | |
828 | } | |
829 | ||
830 | #ifdef CONFIG_PACKET_MULTICAST | |
831 | packet_flush_mclist(sk); | |
832 | #endif | |
833 | ||
834 | #ifdef CONFIG_PACKET_MMAP | |
835 | if (po->pg_vec) { | |
836 | struct tpacket_req req; | |
837 | memset(&req, 0, sizeof(req)); | |
838 | packet_set_ring(sk, &req, 1); | |
839 | } | |
840 | #endif | |
841 | ||
842 | /* | |
843 | * Now the socket is dead. No more input will appear. | |
844 | */ | |
845 | ||
846 | sock_orphan(sk); | |
847 | sock->sk = NULL; | |
848 | ||
849 | /* Purge queues */ | |
850 | ||
851 | skb_queue_purge(&sk->sk_receive_queue); | |
852 | ||
853 | sock_put(sk); | |
854 | return 0; | |
855 | } | |
856 | ||
857 | /* | |
858 | * Attach a packet hook. | |
859 | */ | |
860 | ||
0e11c91e | 861 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
1da177e4 LT |
862 | { |
863 | struct packet_sock *po = pkt_sk(sk); | |
864 | /* | |
865 | * Detach an existing hook if present. | |
866 | */ | |
867 | ||
868 | lock_sock(sk); | |
869 | ||
870 | spin_lock(&po->bind_lock); | |
871 | if (po->running) { | |
872 | __sock_put(sk); | |
873 | po->running = 0; | |
874 | po->num = 0; | |
875 | spin_unlock(&po->bind_lock); | |
876 | dev_remove_pack(&po->prot_hook); | |
877 | spin_lock(&po->bind_lock); | |
878 | } | |
879 | ||
880 | po->num = protocol; | |
881 | po->prot_hook.type = protocol; | |
882 | po->prot_hook.dev = dev; | |
883 | ||
884 | po->ifindex = dev ? dev->ifindex : 0; | |
885 | ||
886 | if (protocol == 0) | |
887 | goto out_unlock; | |
888 | ||
889 | if (dev) { | |
890 | if (dev->flags&IFF_UP) { | |
891 | dev_add_pack(&po->prot_hook); | |
892 | sock_hold(sk); | |
893 | po->running = 1; | |
894 | } else { | |
895 | sk->sk_err = ENETDOWN; | |
896 | if (!sock_flag(sk, SOCK_DEAD)) | |
897 | sk->sk_error_report(sk); | |
898 | } | |
899 | } else { | |
900 | dev_add_pack(&po->prot_hook); | |
901 | sock_hold(sk); | |
902 | po->running = 1; | |
903 | } | |
904 | ||
905 | out_unlock: | |
906 | spin_unlock(&po->bind_lock); | |
907 | release_sock(sk); | |
908 | return 0; | |
909 | } | |
910 | ||
911 | /* | |
912 | * Bind a packet socket to a device | |
913 | */ | |
914 | ||
915 | #ifdef CONFIG_SOCK_PACKET | |
916 | ||
917 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
918 | { | |
919 | struct sock *sk=sock->sk; | |
920 | char name[15]; | |
921 | struct net_device *dev; | |
922 | int err = -ENODEV; | |
923 | ||
924 | /* | |
925 | * Check legality | |
926 | */ | |
927 | ||
8ae55f04 | 928 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 LT |
929 | return -EINVAL; |
930 | strlcpy(name,uaddr->sa_data,sizeof(name)); | |
931 | ||
932 | dev = dev_get_by_name(name); | |
933 | if (dev) { | |
934 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); | |
935 | dev_put(dev); | |
936 | } | |
937 | return err; | |
938 | } | |
939 | #endif | |
940 | ||
941 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
942 | { | |
943 | struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; | |
944 | struct sock *sk=sock->sk; | |
945 | struct net_device *dev = NULL; | |
946 | int err; | |
947 | ||
948 | ||
949 | /* | |
950 | * Check legality | |
951 | */ | |
952 | ||
953 | if (addr_len < sizeof(struct sockaddr_ll)) | |
954 | return -EINVAL; | |
955 | if (sll->sll_family != AF_PACKET) | |
956 | return -EINVAL; | |
957 | ||
958 | if (sll->sll_ifindex) { | |
959 | err = -ENODEV; | |
960 | dev = dev_get_by_index(sll->sll_ifindex); | |
961 | if (dev == NULL) | |
962 | goto out; | |
963 | } | |
964 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
965 | if (dev) | |
966 | dev_put(dev); | |
967 | ||
968 | out: | |
969 | return err; | |
970 | } | |
971 | ||
972 | static struct proto packet_proto = { | |
973 | .name = "PACKET", | |
974 | .owner = THIS_MODULE, | |
975 | .obj_size = sizeof(struct packet_sock), | |
976 | }; | |
977 | ||
978 | /* | |
979 | * Create a packet of type SOCK_PACKET. | |
980 | */ | |
981 | ||
982 | static int packet_create(struct socket *sock, int protocol) | |
983 | { | |
984 | struct sock *sk; | |
985 | struct packet_sock *po; | |
0e11c91e | 986 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1da177e4 LT |
987 | int err; |
988 | ||
989 | if (!capable(CAP_NET_RAW)) | |
990 | return -EPERM; | |
991 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW | |
992 | #ifdef CONFIG_SOCK_PACKET | |
993 | && sock->type != SOCK_PACKET | |
994 | #endif | |
995 | ) | |
996 | return -ESOCKTNOSUPPORT; | |
997 | ||
998 | sock->state = SS_UNCONNECTED; | |
999 | ||
1000 | err = -ENOBUFS; | |
1001 | sk = sk_alloc(PF_PACKET, GFP_KERNEL, &packet_proto, 1); | |
1002 | if (sk == NULL) | |
1003 | goto out; | |
1004 | ||
1005 | sock->ops = &packet_ops; | |
1006 | #ifdef CONFIG_SOCK_PACKET | |
1007 | if (sock->type == SOCK_PACKET) | |
1008 | sock->ops = &packet_ops_spkt; | |
1009 | #endif | |
1010 | sock_init_data(sock, sk); | |
1011 | ||
1012 | po = pkt_sk(sk); | |
1013 | sk->sk_family = PF_PACKET; | |
0e11c91e | 1014 | po->num = proto; |
1da177e4 LT |
1015 | |
1016 | sk->sk_destruct = packet_sock_destruct; | |
1017 | atomic_inc(&packet_socks_nr); | |
1018 | ||
1019 | /* | |
1020 | * Attach a protocol block | |
1021 | */ | |
1022 | ||
1023 | spin_lock_init(&po->bind_lock); | |
1024 | po->prot_hook.func = packet_rcv; | |
1025 | #ifdef CONFIG_SOCK_PACKET | |
1026 | if (sock->type == SOCK_PACKET) | |
1027 | po->prot_hook.func = packet_rcv_spkt; | |
1028 | #endif | |
1029 | po->prot_hook.af_packet_priv = sk; | |
1030 | ||
0e11c91e AV |
1031 | if (proto) { |
1032 | po->prot_hook.type = proto; | |
1da177e4 LT |
1033 | dev_add_pack(&po->prot_hook); |
1034 | sock_hold(sk); | |
1035 | po->running = 1; | |
1036 | } | |
1037 | ||
1038 | write_lock_bh(&packet_sklist_lock); | |
1039 | sk_add_node(sk, &packet_sklist); | |
1040 | write_unlock_bh(&packet_sklist_lock); | |
1041 | return(0); | |
1042 | out: | |
1043 | return err; | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * Pull a packet from our receive queue and hand it to the user. | |
1048 | * If necessary we block. | |
1049 | */ | |
1050 | ||
1051 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1052 | struct msghdr *msg, size_t len, int flags) | |
1053 | { | |
1054 | struct sock *sk = sock->sk; | |
1055 | struct sk_buff *skb; | |
1056 | int copied, err; | |
0fb375fb | 1057 | struct sockaddr_ll *sll; |
1da177e4 LT |
1058 | |
1059 | err = -EINVAL; | |
1060 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) | |
1061 | goto out; | |
1062 | ||
1063 | #if 0 | |
1064 | /* What error should we return now? EUNATTACH? */ | |
1065 | if (pkt_sk(sk)->ifindex < 0) | |
1066 | return -ENODEV; | |
1067 | #endif | |
1068 | ||
1da177e4 LT |
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 | ||
8ae55f04 | 1086 | if (skb == NULL) |
1da177e4 LT |
1087 | goto out; |
1088 | ||
0fb375fb EB |
1089 | /* |
1090 | * If the address length field is there to be filled in, we fill | |
1091 | * it in now. | |
1092 | */ | |
1093 | ||
1094 | sll = (struct sockaddr_ll*)skb->cb; | |
1095 | if (sock->type == SOCK_PACKET) | |
1096 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
1097 | else | |
1098 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); | |
1099 | ||
1da177e4 LT |
1100 | /* |
1101 | * You lose any data beyond the buffer you gave. If it worries a | |
1102 | * user program they can ask the device for its MTU anyway. | |
1103 | */ | |
1104 | ||
1105 | copied = skb->len; | |
1106 | if (copied > len) | |
1107 | { | |
1108 | copied=len; | |
1109 | msg->msg_flags|=MSG_TRUNC; | |
1110 | } | |
1111 | ||
1112 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1113 | if (err) | |
1114 | goto out_free; | |
1115 | ||
1116 | sock_recv_timestamp(msg, sk, skb); | |
1117 | ||
1118 | if (msg->msg_name) | |
1119 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
1120 | ||
1121 | /* | |
1122 | * Free or return the buffer as appropriate. Again this | |
1123 | * hides all the races and re-entrancy issues from us. | |
1124 | */ | |
1125 | err = (flags&MSG_TRUNC) ? skb->len : copied; | |
1126 | ||
1127 | out_free: | |
1128 | skb_free_datagram(sk, skb); | |
1129 | out: | |
1130 | return err; | |
1131 | } | |
1132 | ||
1133 | #ifdef CONFIG_SOCK_PACKET | |
1134 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, | |
1135 | int *uaddr_len, int peer) | |
1136 | { | |
1137 | struct net_device *dev; | |
1138 | struct sock *sk = sock->sk; | |
1139 | ||
1140 | if (peer) | |
1141 | return -EOPNOTSUPP; | |
1142 | ||
1143 | uaddr->sa_family = AF_PACKET; | |
1144 | dev = dev_get_by_index(pkt_sk(sk)->ifindex); | |
1145 | if (dev) { | |
1146 | strlcpy(uaddr->sa_data, dev->name, 15); | |
1147 | dev_put(dev); | |
1148 | } else | |
1149 | memset(uaddr->sa_data, 0, 14); | |
1150 | *uaddr_len = sizeof(*uaddr); | |
1151 | ||
1152 | return 0; | |
1153 | } | |
1154 | #endif | |
1155 | ||
1156 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
1157 | int *uaddr_len, int peer) | |
1158 | { | |
1159 | struct net_device *dev; | |
1160 | struct sock *sk = sock->sk; | |
1161 | struct packet_sock *po = pkt_sk(sk); | |
1162 | struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; | |
1163 | ||
1164 | if (peer) | |
1165 | return -EOPNOTSUPP; | |
1166 | ||
1167 | sll->sll_family = AF_PACKET; | |
1168 | sll->sll_ifindex = po->ifindex; | |
1169 | sll->sll_protocol = po->num; | |
1170 | dev = dev_get_by_index(po->ifindex); | |
1171 | if (dev) { | |
1172 | sll->sll_hatype = dev->type; | |
1173 | sll->sll_halen = dev->addr_len; | |
1174 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1175 | dev_put(dev); | |
1176 | } else { | |
1177 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
1178 | sll->sll_halen = 0; | |
1179 | } | |
0fb375fb | 1180 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
1181 | |
1182 | return 0; | |
1183 | } | |
1184 | ||
1185 | #ifdef CONFIG_PACKET_MULTICAST | |
1186 | static void packet_dev_mc(struct net_device *dev, struct packet_mclist *i, int what) | |
1187 | { | |
1188 | switch (i->type) { | |
1189 | case PACKET_MR_MULTICAST: | |
1190 | if (what > 0) | |
1191 | dev_mc_add(dev, i->addr, i->alen, 0); | |
1192 | else | |
1193 | dev_mc_delete(dev, i->addr, i->alen, 0); | |
1194 | break; | |
1195 | case PACKET_MR_PROMISC: | |
1196 | dev_set_promiscuity(dev, what); | |
1197 | break; | |
1198 | case PACKET_MR_ALLMULTI: | |
1199 | dev_set_allmulti(dev, what); | |
1200 | break; | |
1201 | default:; | |
1202 | } | |
1203 | } | |
1204 | ||
1205 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
1206 | { | |
1207 | for ( ; i; i=i->next) { | |
1208 | if (i->ifindex == dev->ifindex) | |
1209 | packet_dev_mc(dev, i, what); | |
1210 | } | |
1211 | } | |
1212 | ||
0fb375fb | 1213 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1214 | { |
1215 | struct packet_sock *po = pkt_sk(sk); | |
1216 | struct packet_mclist *ml, *i; | |
1217 | struct net_device *dev; | |
1218 | int err; | |
1219 | ||
1220 | rtnl_lock(); | |
1221 | ||
1222 | err = -ENODEV; | |
1223 | dev = __dev_get_by_index(mreq->mr_ifindex); | |
1224 | if (!dev) | |
1225 | goto done; | |
1226 | ||
1227 | err = -EINVAL; | |
1228 | if (mreq->mr_alen > dev->addr_len) | |
1229 | goto done; | |
1230 | ||
1231 | err = -ENOBUFS; | |
8b3a7005 | 1232 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
1233 | if (i == NULL) |
1234 | goto done; | |
1235 | ||
1236 | err = 0; | |
1237 | for (ml = po->mclist; ml; ml = ml->next) { | |
1238 | if (ml->ifindex == mreq->mr_ifindex && | |
1239 | ml->type == mreq->mr_type && | |
1240 | ml->alen == mreq->mr_alen && | |
1241 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1242 | ml->count++; | |
1243 | /* Free the new element ... */ | |
1244 | kfree(i); | |
1245 | goto done; | |
1246 | } | |
1247 | } | |
1248 | ||
1249 | i->type = mreq->mr_type; | |
1250 | i->ifindex = mreq->mr_ifindex; | |
1251 | i->alen = mreq->mr_alen; | |
1252 | memcpy(i->addr, mreq->mr_address, i->alen); | |
1253 | i->count = 1; | |
1254 | i->next = po->mclist; | |
1255 | po->mclist = i; | |
1256 | packet_dev_mc(dev, i, +1); | |
1257 | ||
1258 | done: | |
1259 | rtnl_unlock(); | |
1260 | return err; | |
1261 | } | |
1262 | ||
0fb375fb | 1263 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1264 | { |
1265 | struct packet_mclist *ml, **mlp; | |
1266 | ||
1267 | rtnl_lock(); | |
1268 | ||
1269 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
1270 | if (ml->ifindex == mreq->mr_ifindex && | |
1271 | ml->type == mreq->mr_type && | |
1272 | ml->alen == mreq->mr_alen && | |
1273 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1274 | if (--ml->count == 0) { | |
1275 | struct net_device *dev; | |
1276 | *mlp = ml->next; | |
1277 | dev = dev_get_by_index(ml->ifindex); | |
1278 | if (dev) { | |
1279 | packet_dev_mc(dev, ml, -1); | |
1280 | dev_put(dev); | |
1281 | } | |
1282 | kfree(ml); | |
1283 | } | |
1284 | rtnl_unlock(); | |
1285 | return 0; | |
1286 | } | |
1287 | } | |
1288 | rtnl_unlock(); | |
1289 | return -EADDRNOTAVAIL; | |
1290 | } | |
1291 | ||
1292 | static void packet_flush_mclist(struct sock *sk) | |
1293 | { | |
1294 | struct packet_sock *po = pkt_sk(sk); | |
1295 | struct packet_mclist *ml; | |
1296 | ||
1297 | if (!po->mclist) | |
1298 | return; | |
1299 | ||
1300 | rtnl_lock(); | |
1301 | while ((ml = po->mclist) != NULL) { | |
1302 | struct net_device *dev; | |
1303 | ||
1304 | po->mclist = ml->next; | |
1305 | if ((dev = dev_get_by_index(ml->ifindex)) != NULL) { | |
1306 | packet_dev_mc(dev, ml, -1); | |
1307 | dev_put(dev); | |
1308 | } | |
1309 | kfree(ml); | |
1310 | } | |
1311 | rtnl_unlock(); | |
1312 | } | |
1313 | #endif | |
1314 | ||
1315 | static int | |
1316 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) | |
1317 | { | |
1318 | struct sock *sk = sock->sk; | |
1319 | int ret; | |
1320 | ||
1321 | if (level != SOL_PACKET) | |
1322 | return -ENOPROTOOPT; | |
1323 | ||
1324 | switch(optname) { | |
1325 | #ifdef CONFIG_PACKET_MULTICAST | |
1326 | case PACKET_ADD_MEMBERSHIP: | |
1327 | case PACKET_DROP_MEMBERSHIP: | |
1328 | { | |
0fb375fb EB |
1329 | struct packet_mreq_max mreq; |
1330 | int len = optlen; | |
1331 | memset(&mreq, 0, sizeof(mreq)); | |
1332 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 1333 | return -EINVAL; |
0fb375fb EB |
1334 | if (len > sizeof(mreq)) |
1335 | len = sizeof(mreq); | |
1336 | if (copy_from_user(&mreq,optval,len)) | |
1da177e4 | 1337 | return -EFAULT; |
0fb375fb EB |
1338 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
1339 | return -EINVAL; | |
1da177e4 LT |
1340 | if (optname == PACKET_ADD_MEMBERSHIP) |
1341 | ret = packet_mc_add(sk, &mreq); | |
1342 | else | |
1343 | ret = packet_mc_drop(sk, &mreq); | |
1344 | return ret; | |
1345 | } | |
1346 | #endif | |
1347 | #ifdef CONFIG_PACKET_MMAP | |
1348 | case PACKET_RX_RING: | |
1349 | { | |
1350 | struct tpacket_req req; | |
1351 | ||
1352 | if (optlen<sizeof(req)) | |
1353 | return -EINVAL; | |
1354 | if (copy_from_user(&req,optval,sizeof(req))) | |
1355 | return -EFAULT; | |
1356 | return packet_set_ring(sk, &req, 0); | |
1357 | } | |
1358 | case PACKET_COPY_THRESH: | |
1359 | { | |
1360 | int val; | |
1361 | ||
1362 | if (optlen!=sizeof(val)) | |
1363 | return -EINVAL; | |
1364 | if (copy_from_user(&val,optval,sizeof(val))) | |
1365 | return -EFAULT; | |
1366 | ||
1367 | pkt_sk(sk)->copy_thresh = val; | |
1368 | return 0; | |
1369 | } | |
1370 | #endif | |
1371 | default: | |
1372 | return -ENOPROTOOPT; | |
1373 | } | |
1374 | } | |
1375 | ||
1376 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
1377 | char __user *optval, int __user *optlen) | |
1378 | { | |
1379 | int len; | |
1380 | struct sock *sk = sock->sk; | |
1381 | struct packet_sock *po = pkt_sk(sk); | |
1382 | ||
1383 | if (level != SOL_PACKET) | |
1384 | return -ENOPROTOOPT; | |
1385 | ||
8ae55f04 KK |
1386 | if (get_user(len, optlen)) |
1387 | return -EFAULT; | |
1da177e4 LT |
1388 | |
1389 | if (len < 0) | |
1390 | return -EINVAL; | |
1391 | ||
1392 | switch(optname) { | |
1393 | case PACKET_STATISTICS: | |
1394 | { | |
1395 | struct tpacket_stats st; | |
1396 | ||
1397 | if (len > sizeof(struct tpacket_stats)) | |
1398 | len = sizeof(struct tpacket_stats); | |
1399 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1400 | st = po->stats; | |
1401 | memset(&po->stats, 0, sizeof(st)); | |
1402 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1403 | st.tp_packets += st.tp_drops; | |
1404 | ||
1405 | if (copy_to_user(optval, &st, len)) | |
1406 | return -EFAULT; | |
1407 | break; | |
1408 | } | |
1409 | default: | |
1410 | return -ENOPROTOOPT; | |
1411 | } | |
1412 | ||
8ae55f04 KK |
1413 | if (put_user(len, optlen)) |
1414 | return -EFAULT; | |
1415 | return 0; | |
1da177e4 LT |
1416 | } |
1417 | ||
1418 | ||
1419 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) | |
1420 | { | |
1421 | struct sock *sk; | |
1422 | struct hlist_node *node; | |
1423 | struct net_device *dev = (struct net_device*)data; | |
1424 | ||
1425 | read_lock(&packet_sklist_lock); | |
1426 | sk_for_each(sk, node, &packet_sklist) { | |
1427 | struct packet_sock *po = pkt_sk(sk); | |
1428 | ||
1429 | switch (msg) { | |
1430 | case NETDEV_UNREGISTER: | |
1431 | #ifdef CONFIG_PACKET_MULTICAST | |
1432 | if (po->mclist) | |
1433 | packet_dev_mclist(dev, po->mclist, -1); | |
1434 | // fallthrough | |
1435 | #endif | |
1436 | case NETDEV_DOWN: | |
1437 | if (dev->ifindex == po->ifindex) { | |
1438 | spin_lock(&po->bind_lock); | |
1439 | if (po->running) { | |
1440 | __dev_remove_pack(&po->prot_hook); | |
1441 | __sock_put(sk); | |
1442 | po->running = 0; | |
1443 | sk->sk_err = ENETDOWN; | |
1444 | if (!sock_flag(sk, SOCK_DEAD)) | |
1445 | sk->sk_error_report(sk); | |
1446 | } | |
1447 | if (msg == NETDEV_UNREGISTER) { | |
1448 | po->ifindex = -1; | |
1449 | po->prot_hook.dev = NULL; | |
1450 | } | |
1451 | spin_unlock(&po->bind_lock); | |
1452 | } | |
1453 | break; | |
1454 | case NETDEV_UP: | |
1455 | spin_lock(&po->bind_lock); | |
1456 | if (dev->ifindex == po->ifindex && po->num && | |
1457 | !po->running) { | |
1458 | dev_add_pack(&po->prot_hook); | |
1459 | sock_hold(sk); | |
1460 | po->running = 1; | |
1461 | } | |
1462 | spin_unlock(&po->bind_lock); | |
1463 | break; | |
1464 | } | |
1465 | } | |
1466 | read_unlock(&packet_sklist_lock); | |
1467 | return NOTIFY_DONE; | |
1468 | } | |
1469 | ||
1470 | ||
1471 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
1472 | unsigned long arg) | |
1473 | { | |
1474 | struct sock *sk = sock->sk; | |
1475 | ||
1476 | switch(cmd) { | |
1477 | case SIOCOUTQ: | |
1478 | { | |
1479 | int amount = atomic_read(&sk->sk_wmem_alloc); | |
1480 | return put_user(amount, (int __user *)arg); | |
1481 | } | |
1482 | case SIOCINQ: | |
1483 | { | |
1484 | struct sk_buff *skb; | |
1485 | int amount = 0; | |
1486 | ||
1487 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1488 | skb = skb_peek(&sk->sk_receive_queue); | |
1489 | if (skb) | |
1490 | amount = skb->len; | |
1491 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1492 | return put_user(amount, (int __user *)arg); | |
1493 | } | |
1494 | case SIOCGSTAMP: | |
1495 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
1496 | ||
1497 | #ifdef CONFIG_INET | |
1498 | case SIOCADDRT: | |
1499 | case SIOCDELRT: | |
1500 | case SIOCDARP: | |
1501 | case SIOCGARP: | |
1502 | case SIOCSARP: | |
1503 | case SIOCGIFADDR: | |
1504 | case SIOCSIFADDR: | |
1505 | case SIOCGIFBRDADDR: | |
1506 | case SIOCSIFBRDADDR: | |
1507 | case SIOCGIFNETMASK: | |
1508 | case SIOCSIFNETMASK: | |
1509 | case SIOCGIFDSTADDR: | |
1510 | case SIOCSIFDSTADDR: | |
1511 | case SIOCSIFFLAGS: | |
1512 | return inet_dgram_ops.ioctl(sock, cmd, arg); | |
1513 | #endif | |
1514 | ||
1515 | default: | |
b5e5fa5e | 1516 | return -ENOIOCTLCMD; |
1da177e4 LT |
1517 | } |
1518 | return 0; | |
1519 | } | |
1520 | ||
1521 | #ifndef CONFIG_PACKET_MMAP | |
1522 | #define packet_mmap sock_no_mmap | |
1523 | #define packet_poll datagram_poll | |
1524 | #else | |
1525 | ||
1526 | static unsigned int packet_poll(struct file * file, struct socket *sock, | |
1527 | poll_table *wait) | |
1528 | { | |
1529 | struct sock *sk = sock->sk; | |
1530 | struct packet_sock *po = pkt_sk(sk); | |
1531 | unsigned int mask = datagram_poll(file, sock, wait); | |
1532 | ||
1533 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1534 | if (po->pg_vec) { | |
1535 | unsigned last = po->head ? po->head-1 : po->frame_max; | |
1536 | struct tpacket_hdr *h; | |
1537 | ||
1538 | h = (struct tpacket_hdr *)packet_lookup_frame(po, last); | |
1539 | ||
1540 | if (h->tp_status) | |
1541 | mask |= POLLIN | POLLRDNORM; | |
1542 | } | |
1543 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1544 | return mask; | |
1545 | } | |
1546 | ||
1547 | ||
1548 | /* Dirty? Well, I still did not learn better way to account | |
1549 | * for user mmaps. | |
1550 | */ | |
1551 | ||
1552 | static void packet_mm_open(struct vm_area_struct *vma) | |
1553 | { | |
1554 | struct file *file = vma->vm_file; | |
b69aee04 | 1555 | struct socket * sock = file->private_data; |
1da177e4 LT |
1556 | struct sock *sk = sock->sk; |
1557 | ||
1558 | if (sk) | |
1559 | atomic_inc(&pkt_sk(sk)->mapped); | |
1560 | } | |
1561 | ||
1562 | static void packet_mm_close(struct vm_area_struct *vma) | |
1563 | { | |
1564 | struct file *file = vma->vm_file; | |
b69aee04 | 1565 | struct socket * sock = file->private_data; |
1da177e4 LT |
1566 | struct sock *sk = sock->sk; |
1567 | ||
1568 | if (sk) | |
1569 | atomic_dec(&pkt_sk(sk)->mapped); | |
1570 | } | |
1571 | ||
1572 | static struct vm_operations_struct packet_mmap_ops = { | |
1573 | .open = packet_mm_open, | |
1574 | .close =packet_mm_close, | |
1575 | }; | |
1576 | ||
1577 | static inline struct page *pg_vec_endpage(char *one_pg_vec, unsigned int order) | |
1578 | { | |
1579 | return virt_to_page(one_pg_vec + (PAGE_SIZE << order) - 1); | |
1580 | } | |
1581 | ||
4ebf0ae2 | 1582 | static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len) |
1da177e4 LT |
1583 | { |
1584 | int i; | |
1585 | ||
4ebf0ae2 DM |
1586 | for (i = 0; i < len; i++) { |
1587 | if (likely(pg_vec[i])) | |
1588 | free_pages((unsigned long) pg_vec[i], order); | |
1da177e4 LT |
1589 | } |
1590 | kfree(pg_vec); | |
1591 | } | |
1592 | ||
4ebf0ae2 DM |
1593 | static inline char *alloc_one_pg_vec_page(unsigned long order) |
1594 | { | |
1595 | return (char *) __get_free_pages(GFP_KERNEL | __GFP_COMP | __GFP_ZERO, | |
1596 | order); | |
1597 | } | |
1598 | ||
1599 | static char **alloc_pg_vec(struct tpacket_req *req, int order) | |
1600 | { | |
1601 | unsigned int block_nr = req->tp_block_nr; | |
1602 | char **pg_vec; | |
1603 | int i; | |
1604 | ||
1605 | pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL); | |
1606 | if (unlikely(!pg_vec)) | |
1607 | goto out; | |
1608 | ||
1609 | for (i = 0; i < block_nr; i++) { | |
1610 | pg_vec[i] = alloc_one_pg_vec_page(order); | |
1611 | if (unlikely(!pg_vec[i])) | |
1612 | goto out_free_pgvec; | |
1613 | } | |
1614 | ||
1615 | out: | |
1616 | return pg_vec; | |
1617 | ||
1618 | out_free_pgvec: | |
1619 | free_pg_vec(pg_vec, order, block_nr); | |
1620 | pg_vec = NULL; | |
1621 | goto out; | |
1622 | } | |
1da177e4 LT |
1623 | |
1624 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing) | |
1625 | { | |
1626 | char **pg_vec = NULL; | |
1627 | struct packet_sock *po = pkt_sk(sk); | |
0e11c91e AV |
1628 | int was_running, order = 0; |
1629 | __be16 num; | |
1da177e4 LT |
1630 | int err = 0; |
1631 | ||
1632 | if (req->tp_block_nr) { | |
1633 | int i, l; | |
1634 | ||
1635 | /* Sanity tests and some calculations */ | |
1636 | ||
4ebf0ae2 | 1637 | if (unlikely(po->pg_vec)) |
1da177e4 LT |
1638 | return -EBUSY; |
1639 | ||
4ebf0ae2 | 1640 | if (unlikely((int)req->tp_block_size <= 0)) |
1da177e4 | 1641 | return -EINVAL; |
4ebf0ae2 | 1642 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
1da177e4 | 1643 | return -EINVAL; |
4ebf0ae2 | 1644 | if (unlikely(req->tp_frame_size < TPACKET_HDRLEN)) |
1da177e4 | 1645 | return -EINVAL; |
4ebf0ae2 | 1646 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
1da177e4 LT |
1647 | return -EINVAL; |
1648 | ||
1649 | po->frames_per_block = req->tp_block_size/req->tp_frame_size; | |
4ebf0ae2 | 1650 | if (unlikely(po->frames_per_block <= 0)) |
1da177e4 | 1651 | return -EINVAL; |
4ebf0ae2 DM |
1652 | if (unlikely((po->frames_per_block * req->tp_block_nr) != |
1653 | req->tp_frame_nr)) | |
1da177e4 | 1654 | return -EINVAL; |
1da177e4 LT |
1655 | |
1656 | err = -ENOMEM; | |
4ebf0ae2 DM |
1657 | order = get_order(req->tp_block_size); |
1658 | pg_vec = alloc_pg_vec(req, order); | |
1659 | if (unlikely(!pg_vec)) | |
1da177e4 | 1660 | goto out; |
1da177e4 LT |
1661 | |
1662 | l = 0; | |
4ebf0ae2 | 1663 | for (i = 0; i < req->tp_block_nr; i++) { |
1da177e4 LT |
1664 | char *ptr = pg_vec[i]; |
1665 | struct tpacket_hdr *header; | |
1666 | int k; | |
1667 | ||
4ebf0ae2 DM |
1668 | for (k = 0; k < po->frames_per_block; k++) { |
1669 | header = (struct tpacket_hdr *) ptr; | |
1da177e4 LT |
1670 | header->tp_status = TP_STATUS_KERNEL; |
1671 | ptr += req->tp_frame_size; | |
1672 | } | |
1673 | } | |
1674 | /* Done */ | |
1675 | } else { | |
4ebf0ae2 | 1676 | if (unlikely(req->tp_frame_nr)) |
1da177e4 LT |
1677 | return -EINVAL; |
1678 | } | |
1679 | ||
1680 | lock_sock(sk); | |
1681 | ||
1682 | /* Detach socket from network */ | |
1683 | spin_lock(&po->bind_lock); | |
1684 | was_running = po->running; | |
1685 | num = po->num; | |
1686 | if (was_running) { | |
1687 | __dev_remove_pack(&po->prot_hook); | |
1688 | po->num = 0; | |
1689 | po->running = 0; | |
1690 | __sock_put(sk); | |
1691 | } | |
1692 | spin_unlock(&po->bind_lock); | |
1693 | ||
1694 | synchronize_net(); | |
1695 | ||
1696 | err = -EBUSY; | |
1697 | if (closing || atomic_read(&po->mapped) == 0) { | |
1698 | err = 0; | |
1699 | #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) | |
1700 | ||
1701 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1702 | pg_vec = XC(po->pg_vec, pg_vec); | |
4ebf0ae2 | 1703 | po->frame_max = (req->tp_frame_nr - 1); |
1da177e4 LT |
1704 | po->head = 0; |
1705 | po->frame_size = req->tp_frame_size; | |
1706 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1707 | ||
1708 | order = XC(po->pg_vec_order, order); | |
1709 | req->tp_block_nr = XC(po->pg_vec_len, req->tp_block_nr); | |
1710 | ||
1711 | po->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
1712 | po->prot_hook.func = po->pg_vec ? tpacket_rcv : packet_rcv; | |
1713 | skb_queue_purge(&sk->sk_receive_queue); | |
1714 | #undef XC | |
1715 | if (atomic_read(&po->mapped)) | |
1716 | printk(KERN_DEBUG "packet_mmap: vma is busy: %d\n", atomic_read(&po->mapped)); | |
1717 | } | |
1718 | ||
1719 | spin_lock(&po->bind_lock); | |
1720 | if (was_running && !po->running) { | |
1721 | sock_hold(sk); | |
1722 | po->running = 1; | |
1723 | po->num = num; | |
1724 | dev_add_pack(&po->prot_hook); | |
1725 | } | |
1726 | spin_unlock(&po->bind_lock); | |
1727 | ||
1728 | release_sock(sk); | |
1729 | ||
1da177e4 LT |
1730 | if (pg_vec) |
1731 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
1732 | out: | |
1733 | return err; | |
1734 | } | |
1735 | ||
1736 | static int packet_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
1737 | { | |
1738 | struct sock *sk = sock->sk; | |
1739 | struct packet_sock *po = pkt_sk(sk); | |
1740 | unsigned long size; | |
1741 | unsigned long start; | |
1742 | int err = -EINVAL; | |
1743 | int i; | |
1744 | ||
1745 | if (vma->vm_pgoff) | |
1746 | return -EINVAL; | |
1747 | ||
1748 | size = vma->vm_end - vma->vm_start; | |
1749 | ||
1750 | lock_sock(sk); | |
1751 | if (po->pg_vec == NULL) | |
1752 | goto out; | |
1753 | if (size != po->pg_vec_len*po->pg_vec_pages*PAGE_SIZE) | |
1754 | goto out; | |
1755 | ||
1da177e4 | 1756 | start = vma->vm_start; |
4ebf0ae2 DM |
1757 | for (i = 0; i < po->pg_vec_len; i++) { |
1758 | struct page *page = virt_to_page(po->pg_vec[i]); | |
1759 | int pg_num; | |
1760 | ||
1761 | for (pg_num = 0; pg_num < po->pg_vec_pages; pg_num++, page++) { | |
1762 | err = vm_insert_page(vma, start, page); | |
1763 | if (unlikely(err)) | |
1764 | goto out; | |
1765 | start += PAGE_SIZE; | |
1766 | } | |
1da177e4 | 1767 | } |
4ebf0ae2 | 1768 | atomic_inc(&po->mapped); |
1da177e4 LT |
1769 | vma->vm_ops = &packet_mmap_ops; |
1770 | err = 0; | |
1771 | ||
1772 | out: | |
1773 | release_sock(sk); | |
1774 | return err; | |
1775 | } | |
1776 | #endif | |
1777 | ||
1778 | ||
1779 | #ifdef CONFIG_SOCK_PACKET | |
90ddc4f0 | 1780 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
1781 | .family = PF_PACKET, |
1782 | .owner = THIS_MODULE, | |
1783 | .release = packet_release, | |
1784 | .bind = packet_bind_spkt, | |
1785 | .connect = sock_no_connect, | |
1786 | .socketpair = sock_no_socketpair, | |
1787 | .accept = sock_no_accept, | |
1788 | .getname = packet_getname_spkt, | |
1789 | .poll = datagram_poll, | |
1790 | .ioctl = packet_ioctl, | |
1791 | .listen = sock_no_listen, | |
1792 | .shutdown = sock_no_shutdown, | |
1793 | .setsockopt = sock_no_setsockopt, | |
1794 | .getsockopt = sock_no_getsockopt, | |
1795 | .sendmsg = packet_sendmsg_spkt, | |
1796 | .recvmsg = packet_recvmsg, | |
1797 | .mmap = sock_no_mmap, | |
1798 | .sendpage = sock_no_sendpage, | |
1799 | }; | |
1800 | #endif | |
1801 | ||
90ddc4f0 | 1802 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
1803 | .family = PF_PACKET, |
1804 | .owner = THIS_MODULE, | |
1805 | .release = packet_release, | |
1806 | .bind = packet_bind, | |
1807 | .connect = sock_no_connect, | |
1808 | .socketpair = sock_no_socketpair, | |
1809 | .accept = sock_no_accept, | |
1810 | .getname = packet_getname, | |
1811 | .poll = packet_poll, | |
1812 | .ioctl = packet_ioctl, | |
1813 | .listen = sock_no_listen, | |
1814 | .shutdown = sock_no_shutdown, | |
1815 | .setsockopt = packet_setsockopt, | |
1816 | .getsockopt = packet_getsockopt, | |
1817 | .sendmsg = packet_sendmsg, | |
1818 | .recvmsg = packet_recvmsg, | |
1819 | .mmap = packet_mmap, | |
1820 | .sendpage = sock_no_sendpage, | |
1821 | }; | |
1822 | ||
1823 | static struct net_proto_family packet_family_ops = { | |
1824 | .family = PF_PACKET, | |
1825 | .create = packet_create, | |
1826 | .owner = THIS_MODULE, | |
1827 | }; | |
1828 | ||
1829 | static struct notifier_block packet_netdev_notifier = { | |
1830 | .notifier_call =packet_notifier, | |
1831 | }; | |
1832 | ||
1833 | #ifdef CONFIG_PROC_FS | |
1834 | static inline struct sock *packet_seq_idx(loff_t off) | |
1835 | { | |
1836 | struct sock *s; | |
1837 | struct hlist_node *node; | |
1838 | ||
1839 | sk_for_each(s, node, &packet_sklist) { | |
1840 | if (!off--) | |
1841 | return s; | |
1842 | } | |
1843 | return NULL; | |
1844 | } | |
1845 | ||
1846 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
1847 | { | |
1848 | read_lock(&packet_sklist_lock); | |
1849 | return *pos ? packet_seq_idx(*pos - 1) : SEQ_START_TOKEN; | |
1850 | } | |
1851 | ||
1852 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1853 | { | |
1854 | ++*pos; | |
1855 | return (v == SEQ_START_TOKEN) | |
1856 | ? sk_head(&packet_sklist) | |
1857 | : sk_next((struct sock*)v) ; | |
1858 | } | |
1859 | ||
1860 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
1861 | { | |
1862 | read_unlock(&packet_sklist_lock); | |
1863 | } | |
1864 | ||
1865 | static int packet_seq_show(struct seq_file *seq, void *v) | |
1866 | { | |
1867 | if (v == SEQ_START_TOKEN) | |
1868 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
1869 | else { | |
1870 | struct sock *s = v; | |
1871 | const struct packet_sock *po = pkt_sk(s); | |
1872 | ||
1873 | seq_printf(seq, | |
1874 | "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", | |
1875 | s, | |
1876 | atomic_read(&s->sk_refcnt), | |
1877 | s->sk_type, | |
1878 | ntohs(po->num), | |
1879 | po->ifindex, | |
1880 | po->running, | |
1881 | atomic_read(&s->sk_rmem_alloc), | |
1882 | sock_i_uid(s), | |
1883 | sock_i_ino(s) ); | |
1884 | } | |
1885 | ||
1886 | return 0; | |
1887 | } | |
1888 | ||
1889 | static struct seq_operations packet_seq_ops = { | |
1890 | .start = packet_seq_start, | |
1891 | .next = packet_seq_next, | |
1892 | .stop = packet_seq_stop, | |
1893 | .show = packet_seq_show, | |
1894 | }; | |
1895 | ||
1896 | static int packet_seq_open(struct inode *inode, struct file *file) | |
1897 | { | |
1898 | return seq_open(file, &packet_seq_ops); | |
1899 | } | |
1900 | ||
1901 | static struct file_operations packet_seq_fops = { | |
1902 | .owner = THIS_MODULE, | |
1903 | .open = packet_seq_open, | |
1904 | .read = seq_read, | |
1905 | .llseek = seq_lseek, | |
1906 | .release = seq_release, | |
1907 | }; | |
1908 | ||
1909 | #endif | |
1910 | ||
1911 | static void __exit packet_exit(void) | |
1912 | { | |
1913 | proc_net_remove("packet"); | |
1914 | unregister_netdevice_notifier(&packet_netdev_notifier); | |
1915 | sock_unregister(PF_PACKET); | |
1916 | proto_unregister(&packet_proto); | |
1917 | } | |
1918 | ||
1919 | static int __init packet_init(void) | |
1920 | { | |
1921 | int rc = proto_register(&packet_proto, 0); | |
1922 | ||
1923 | if (rc != 0) | |
1924 | goto out; | |
1925 | ||
1926 | sock_register(&packet_family_ops); | |
1927 | register_netdevice_notifier(&packet_netdev_notifier); | |
1928 | proc_net_fops_create("packet", 0, &packet_seq_fops); | |
1929 | out: | |
1930 | return rc; | |
1931 | } | |
1932 | ||
1933 | module_init(packet_init); | |
1934 | module_exit(packet_exit); | |
1935 | MODULE_LICENSE("GPL"); | |
1936 | MODULE_ALIAS_NETPROTO(PF_PACKET); |