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> | |
a1f8e7f7 | 74 | #include <asm/cacheflush.h> |
1da177e4 LT |
75 | #include <asm/io.h> |
76 | #include <linux/proc_fs.h> | |
77 | #include <linux/seq_file.h> | |
78 | #include <linux/poll.h> | |
79 | #include <linux/module.h> | |
80 | #include <linux/init.h> | |
81 | ||
82 | #ifdef CONFIG_INET | |
83 | #include <net/inet_common.h> | |
84 | #endif | |
85 | ||
86 | #define CONFIG_SOCK_PACKET 1 | |
87 | ||
88 | /* | |
89 | Proposed replacement for SIOC{ADD,DEL}MULTI and | |
90 | IFF_PROMISC, IFF_ALLMULTI flags. | |
91 | ||
92 | It is more expensive, but I believe, | |
93 | it is really correct solution: reentereble, safe and fault tolerant. | |
94 | ||
95 | IFF_PROMISC/IFF_ALLMULTI/SIOC{ADD/DEL}MULTI are faked by keeping | |
96 | reference count and global flag, so that real status is | |
97 | (gflag|(count != 0)), so that we can use obsolete faulty interface | |
98 | not harming clever users. | |
99 | */ | |
100 | #define CONFIG_PACKET_MULTICAST 1 | |
101 | ||
102 | /* | |
103 | Assumptions: | |
104 | - if device has no dev->hard_header routine, it adds and removes ll header | |
105 | inside itself. In this case ll header is invisible outside of device, | |
106 | but higher levels still should reserve dev->hard_header_len. | |
107 | Some devices are enough clever to reallocate skb, when header | |
108 | will not fit to reserved space (tunnel), another ones are silly | |
109 | (PPP). | |
110 | - packet socket receives packets with pulled ll header, | |
111 | so that SOCK_RAW should push it back. | |
112 | ||
113 | On receive: | |
114 | ----------- | |
115 | ||
116 | Incoming, dev->hard_header!=NULL | |
117 | mac.raw -> ll header | |
118 | data -> data | |
119 | ||
120 | Outgoing, dev->hard_header!=NULL | |
121 | mac.raw -> ll header | |
122 | data -> ll header | |
123 | ||
124 | Incoming, dev->hard_header==NULL | |
125 | mac.raw -> UNKNOWN position. It is very likely, that it points to ll header. | |
126 | PPP makes it, that is wrong, because introduce assymetry | |
127 | between rx and tx paths. | |
128 | data -> data | |
129 | ||
130 | Outgoing, dev->hard_header==NULL | |
131 | mac.raw -> data. ll header is still not built! | |
132 | data -> data | |
133 | ||
134 | Resume | |
135 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. | |
136 | ||
137 | ||
138 | On transmit: | |
139 | ------------ | |
140 | ||
141 | dev->hard_header != NULL | |
142 | mac.raw -> ll header | |
143 | data -> ll header | |
144 | ||
145 | dev->hard_header == NULL (ll header is added by device, we cannot control it) | |
146 | mac.raw -> data | |
147 | data -> data | |
148 | ||
149 | We should set nh.raw on output to correct posistion, | |
150 | packet classifier depends on it. | |
151 | */ | |
152 | ||
153 | /* List of all packet sockets. */ | |
154 | static HLIST_HEAD(packet_sklist); | |
155 | static DEFINE_RWLOCK(packet_sklist_lock); | |
156 | ||
157 | static atomic_t packet_socks_nr; | |
158 | ||
159 | ||
160 | /* Private packet socket structures. */ | |
161 | ||
162 | #ifdef CONFIG_PACKET_MULTICAST | |
163 | struct packet_mclist | |
164 | { | |
165 | struct packet_mclist *next; | |
166 | int ifindex; | |
167 | int count; | |
168 | unsigned short type; | |
169 | unsigned short alen; | |
0fb375fb EB |
170 | unsigned char addr[MAX_ADDR_LEN]; |
171 | }; | |
172 | /* identical to struct packet_mreq except it has | |
173 | * a longer address field. | |
174 | */ | |
175 | struct packet_mreq_max | |
176 | { | |
177 | int mr_ifindex; | |
178 | unsigned short mr_type; | |
179 | unsigned short mr_alen; | |
180 | unsigned char mr_address[MAX_ADDR_LEN]; | |
1da177e4 LT |
181 | }; |
182 | #endif | |
183 | #ifdef CONFIG_PACKET_MMAP | |
184 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing); | |
185 | #endif | |
186 | ||
187 | static void packet_flush_mclist(struct sock *sk); | |
188 | ||
189 | struct packet_sock { | |
190 | /* struct sock has to be the first member of packet_sock */ | |
191 | struct sock sk; | |
192 | struct tpacket_stats stats; | |
193 | #ifdef CONFIG_PACKET_MMAP | |
194 | char * *pg_vec; | |
195 | unsigned int head; | |
196 | unsigned int frames_per_block; | |
197 | unsigned int frame_size; | |
198 | unsigned int frame_max; | |
199 | int copy_thresh; | |
200 | #endif | |
201 | struct packet_type prot_hook; | |
202 | spinlock_t bind_lock; | |
203 | char running; /* prot_hook is attached*/ | |
204 | int ifindex; /* bound device */ | |
0e11c91e | 205 | __be16 num; |
1da177e4 LT |
206 | #ifdef CONFIG_PACKET_MULTICAST |
207 | struct packet_mclist *mclist; | |
208 | #endif | |
209 | #ifdef CONFIG_PACKET_MMAP | |
210 | atomic_t mapped; | |
211 | unsigned int pg_vec_order; | |
212 | unsigned int pg_vec_pages; | |
213 | unsigned int pg_vec_len; | |
214 | #endif | |
215 | }; | |
216 | ||
217 | #ifdef CONFIG_PACKET_MMAP | |
218 | ||
219 | static inline char *packet_lookup_frame(struct packet_sock *po, unsigned int position) | |
220 | { | |
221 | unsigned int pg_vec_pos, frame_offset; | |
222 | char *frame; | |
223 | ||
224 | pg_vec_pos = position / po->frames_per_block; | |
225 | frame_offset = position % po->frames_per_block; | |
226 | ||
227 | frame = po->pg_vec[pg_vec_pos] + (frame_offset * po->frame_size); | |
228 | ||
229 | return frame; | |
230 | } | |
231 | #endif | |
232 | ||
233 | static inline struct packet_sock *pkt_sk(struct sock *sk) | |
234 | { | |
235 | return (struct packet_sock *)sk; | |
236 | } | |
237 | ||
238 | static void packet_sock_destruct(struct sock *sk) | |
239 | { | |
240 | BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); | |
241 | BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); | |
242 | ||
243 | if (!sock_flag(sk, SOCK_DEAD)) { | |
244 | printk("Attempt to release alive packet socket: %p\n", sk); | |
245 | return; | |
246 | } | |
247 | ||
248 | atomic_dec(&packet_socks_nr); | |
249 | #ifdef PACKET_REFCNT_DEBUG | |
250 | printk(KERN_DEBUG "PACKET socket %p is free, %d are alive\n", sk, atomic_read(&packet_socks_nr)); | |
251 | #endif | |
252 | } | |
253 | ||
254 | ||
90ddc4f0 | 255 | static const struct proto_ops packet_ops; |
1da177e4 LT |
256 | |
257 | #ifdef CONFIG_SOCK_PACKET | |
90ddc4f0 | 258 | static const struct proto_ops packet_ops_spkt; |
1da177e4 | 259 | |
f2ccd8fa | 260 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
261 | { |
262 | struct sock *sk; | |
263 | struct sockaddr_pkt *spkt; | |
264 | ||
265 | /* | |
266 | * When we registered the protocol we saved the socket in the data | |
267 | * field for just this event. | |
268 | */ | |
269 | ||
270 | sk = pt->af_packet_priv; | |
271 | ||
272 | /* | |
273 | * Yank back the headers [hope the device set this | |
274 | * right or kerboom...] | |
275 | * | |
276 | * Incoming packets have ll header pulled, | |
277 | * push it back. | |
278 | * | |
279 | * For outgoing ones skb->data == skb->mac.raw | |
280 | * so that this procedure is noop. | |
281 | */ | |
282 | ||
283 | if (skb->pkt_type == PACKET_LOOPBACK) | |
284 | goto out; | |
285 | ||
286 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
287 | goto oom; | |
288 | ||
289 | /* drop any routing info */ | |
290 | dst_release(skb->dst); | |
291 | skb->dst = NULL; | |
292 | ||
84531c24 PO |
293 | /* drop conntrack reference */ |
294 | nf_reset(skb); | |
295 | ||
1da177e4 LT |
296 | spkt = (struct sockaddr_pkt*)skb->cb; |
297 | ||
298 | skb_push(skb, skb->data-skb->mac.raw); | |
299 | ||
300 | /* | |
301 | * The SOCK_PACKET socket receives _all_ frames. | |
302 | */ | |
303 | ||
304 | spkt->spkt_family = dev->type; | |
305 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
306 | spkt->spkt_protocol = skb->protocol; | |
307 | ||
308 | /* | |
309 | * Charge the memory to the socket. This is done specifically | |
310 | * to prevent sockets using all the memory up. | |
311 | */ | |
312 | ||
313 | if (sock_queue_rcv_skb(sk,skb) == 0) | |
314 | return 0; | |
315 | ||
316 | out: | |
317 | kfree_skb(skb); | |
318 | oom: | |
319 | return 0; | |
320 | } | |
321 | ||
322 | ||
323 | /* | |
324 | * Output a raw packet to a device layer. This bypasses all the other | |
325 | * protocol layers and you must therefore supply it with a complete frame | |
326 | */ | |
327 | ||
328 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, | |
329 | struct msghdr *msg, size_t len) | |
330 | { | |
331 | struct sock *sk = sock->sk; | |
332 | struct sockaddr_pkt *saddr=(struct sockaddr_pkt *)msg->msg_name; | |
333 | struct sk_buff *skb; | |
334 | struct net_device *dev; | |
0e11c91e | 335 | __be16 proto=0; |
1da177e4 LT |
336 | int err; |
337 | ||
338 | /* | |
339 | * Get and verify the address. | |
340 | */ | |
341 | ||
342 | if (saddr) | |
343 | { | |
344 | if (msg->msg_namelen < sizeof(struct sockaddr)) | |
345 | return(-EINVAL); | |
346 | if (msg->msg_namelen==sizeof(struct sockaddr_pkt)) | |
347 | proto=saddr->spkt_protocol; | |
348 | } | |
349 | else | |
350 | return(-ENOTCONN); /* SOCK_PACKET must be sent giving an address */ | |
351 | ||
352 | /* | |
353 | * Find the device first to size check it | |
354 | */ | |
355 | ||
356 | saddr->spkt_device[13] = 0; | |
357 | dev = dev_get_by_name(saddr->spkt_device); | |
358 | err = -ENODEV; | |
359 | if (dev == NULL) | |
360 | goto out_unlock; | |
361 | ||
d5e76b0a DM |
362 | err = -ENETDOWN; |
363 | if (!(dev->flags & IFF_UP)) | |
364 | goto out_unlock; | |
365 | ||
1da177e4 LT |
366 | /* |
367 | * You may not queue a frame bigger than the mtu. This is the lowest level | |
368 | * raw protocol and you must do your own fragmentation at this level. | |
369 | */ | |
370 | ||
371 | err = -EMSGSIZE; | |
8ae55f04 | 372 | if (len > dev->mtu + dev->hard_header_len) |
1da177e4 LT |
373 | goto out_unlock; |
374 | ||
375 | err = -ENOBUFS; | |
376 | skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL); | |
377 | ||
378 | /* | |
379 | * If the write buffer is full, then tough. At this level the user gets to | |
380 | * deal with the problem - do your own algorithmic backoffs. That's far | |
381 | * more flexible. | |
382 | */ | |
383 | ||
384 | if (skb == NULL) | |
385 | goto out_unlock; | |
386 | ||
387 | /* | |
388 | * Fill it in | |
389 | */ | |
390 | ||
391 | /* FIXME: Save some space for broken drivers that write a | |
392 | * hard header at transmission time by themselves. PPP is the | |
393 | * notable one here. This should really be fixed at the driver level. | |
394 | */ | |
395 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
396 | skb->nh.raw = skb->data; | |
397 | ||
398 | /* Try to align data part correctly */ | |
399 | if (dev->hard_header) { | |
400 | skb->data -= dev->hard_header_len; | |
401 | skb->tail -= dev->hard_header_len; | |
402 | if (len < dev->hard_header_len) | |
403 | skb->nh.raw = skb->data; | |
404 | } | |
405 | ||
406 | /* Returns -EFAULT on error */ | |
407 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); | |
408 | skb->protocol = proto; | |
409 | skb->dev = dev; | |
410 | skb->priority = sk->sk_priority; | |
411 | if (err) | |
412 | goto out_free; | |
413 | ||
1da177e4 LT |
414 | /* |
415 | * Now send it | |
416 | */ | |
417 | ||
418 | dev_queue_xmit(skb); | |
419 | dev_put(dev); | |
420 | return(len); | |
421 | ||
422 | out_free: | |
423 | kfree_skb(skb); | |
424 | out_unlock: | |
425 | if (dev) | |
426 | dev_put(dev); | |
427 | return err; | |
428 | } | |
429 | #endif | |
430 | ||
dbcb5855 DM |
431 | static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk, |
432 | unsigned int res) | |
1da177e4 LT |
433 | { |
434 | struct sk_filter *filter; | |
fda9ef5d DM |
435 | |
436 | rcu_read_lock_bh(); | |
437 | filter = rcu_dereference(sk->sk_filter); | |
dbcb5855 DM |
438 | if (filter != NULL) |
439 | res = sk_run_filter(skb, filter->insns, filter->len); | |
fda9ef5d | 440 | rcu_read_unlock_bh(); |
1da177e4 | 441 | |
dbcb5855 | 442 | return res; |
1da177e4 LT |
443 | } |
444 | ||
445 | /* | |
446 | This function makes lazy skb cloning in hope that most of packets | |
447 | are discarded by BPF. | |
448 | ||
449 | Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
450 | and skb->cb are mangled. It works because (and until) packets | |
451 | falling here are owned by current CPU. Output packets are cloned | |
452 | by dev_queue_xmit_nit(), input packets are processed by net_bh | |
453 | sequencially, so that if we return skb to original state on exit, | |
454 | we will not harm anyone. | |
455 | */ | |
456 | ||
f2ccd8fa | 457 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
458 | { |
459 | struct sock *sk; | |
460 | struct sockaddr_ll *sll; | |
461 | struct packet_sock *po; | |
462 | u8 * skb_head = skb->data; | |
463 | int skb_len = skb->len; | |
dbcb5855 | 464 | unsigned int snaplen, res; |
1da177e4 LT |
465 | |
466 | if (skb->pkt_type == PACKET_LOOPBACK) | |
467 | goto drop; | |
468 | ||
469 | sk = pt->af_packet_priv; | |
470 | po = pkt_sk(sk); | |
471 | ||
472 | skb->dev = dev; | |
473 | ||
474 | if (dev->hard_header) { | |
475 | /* The device has an explicit notion of ll header, | |
476 | exported to higher levels. | |
477 | ||
478 | Otherwise, the device hides datails of it frame | |
479 | structure, so that corresponding packet head | |
480 | never delivered to user. | |
481 | */ | |
482 | if (sk->sk_type != SOCK_DGRAM) | |
483 | skb_push(skb, skb->data - skb->mac.raw); | |
484 | else if (skb->pkt_type == PACKET_OUTGOING) { | |
485 | /* Special case: outgoing packets have ll header at head */ | |
486 | skb_pull(skb, skb->nh.raw - skb->data); | |
487 | } | |
488 | } | |
489 | ||
490 | snaplen = skb->len; | |
491 | ||
dbcb5855 DM |
492 | res = run_filter(skb, sk, snaplen); |
493 | if (!res) | |
fda9ef5d | 494 | goto drop_n_restore; |
dbcb5855 DM |
495 | if (snaplen > res) |
496 | snaplen = res; | |
1da177e4 LT |
497 | |
498 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
499 | (unsigned)sk->sk_rcvbuf) | |
500 | goto drop_n_acct; | |
501 | ||
502 | if (skb_shared(skb)) { | |
503 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
504 | if (nskb == NULL) | |
505 | goto drop_n_acct; | |
506 | ||
507 | if (skb_head != skb->data) { | |
508 | skb->data = skb_head; | |
509 | skb->len = skb_len; | |
510 | } | |
511 | kfree_skb(skb); | |
512 | skb = nskb; | |
513 | } | |
514 | ||
515 | sll = (struct sockaddr_ll*)skb->cb; | |
516 | sll->sll_family = AF_PACKET; | |
517 | sll->sll_hatype = dev->type; | |
518 | sll->sll_protocol = skb->protocol; | |
519 | sll->sll_pkttype = skb->pkt_type; | |
520 | sll->sll_ifindex = dev->ifindex; | |
521 | sll->sll_halen = 0; | |
522 | ||
523 | if (dev->hard_header_parse) | |
524 | sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); | |
525 | ||
526 | if (pskb_trim(skb, snaplen)) | |
527 | goto drop_n_acct; | |
528 | ||
529 | skb_set_owner_r(skb, sk); | |
530 | skb->dev = NULL; | |
531 | dst_release(skb->dst); | |
532 | skb->dst = NULL; | |
533 | ||
84531c24 PO |
534 | /* drop conntrack reference */ |
535 | nf_reset(skb); | |
536 | ||
1da177e4 LT |
537 | spin_lock(&sk->sk_receive_queue.lock); |
538 | po->stats.tp_packets++; | |
539 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
540 | spin_unlock(&sk->sk_receive_queue.lock); | |
541 | sk->sk_data_ready(sk, skb->len); | |
542 | return 0; | |
543 | ||
544 | drop_n_acct: | |
545 | spin_lock(&sk->sk_receive_queue.lock); | |
546 | po->stats.tp_drops++; | |
547 | spin_unlock(&sk->sk_receive_queue.lock); | |
548 | ||
549 | drop_n_restore: | |
550 | if (skb_head != skb->data && skb_shared(skb)) { | |
551 | skb->data = skb_head; | |
552 | skb->len = skb_len; | |
553 | } | |
554 | drop: | |
555 | kfree_skb(skb); | |
556 | return 0; | |
557 | } | |
558 | ||
559 | #ifdef CONFIG_PACKET_MMAP | |
f2ccd8fa | 560 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
561 | { |
562 | struct sock *sk; | |
563 | struct packet_sock *po; | |
564 | struct sockaddr_ll *sll; | |
565 | struct tpacket_hdr *h; | |
566 | u8 * skb_head = skb->data; | |
567 | int skb_len = skb->len; | |
dbcb5855 | 568 | unsigned int snaplen, res; |
1da177e4 LT |
569 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
570 | unsigned short macoff, netoff; | |
571 | struct sk_buff *copy_skb = NULL; | |
572 | ||
573 | if (skb->pkt_type == PACKET_LOOPBACK) | |
574 | goto drop; | |
575 | ||
576 | sk = pt->af_packet_priv; | |
577 | po = pkt_sk(sk); | |
578 | ||
579 | if (dev->hard_header) { | |
580 | if (sk->sk_type != SOCK_DGRAM) | |
581 | skb_push(skb, skb->data - skb->mac.raw); | |
582 | else if (skb->pkt_type == PACKET_OUTGOING) { | |
583 | /* Special case: outgoing packets have ll header at head */ | |
584 | skb_pull(skb, skb->nh.raw - skb->data); | |
84fa7933 | 585 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
1da177e4 LT |
586 | status |= TP_STATUS_CSUMNOTREADY; |
587 | } | |
588 | } | |
589 | ||
590 | snaplen = skb->len; | |
591 | ||
dbcb5855 DM |
592 | res = run_filter(skb, sk, snaplen); |
593 | if (!res) | |
fda9ef5d | 594 | goto drop_n_restore; |
dbcb5855 DM |
595 | if (snaplen > res) |
596 | snaplen = res; | |
1da177e4 LT |
597 | |
598 | if (sk->sk_type == SOCK_DGRAM) { | |
599 | macoff = netoff = TPACKET_ALIGN(TPACKET_HDRLEN) + 16; | |
600 | } else { | |
601 | unsigned maclen = skb->nh.raw - skb->data; | |
602 | netoff = TPACKET_ALIGN(TPACKET_HDRLEN + (maclen < 16 ? 16 : maclen)); | |
603 | macoff = netoff - maclen; | |
604 | } | |
605 | ||
606 | if (macoff + snaplen > po->frame_size) { | |
607 | if (po->copy_thresh && | |
608 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < | |
609 | (unsigned)sk->sk_rcvbuf) { | |
610 | if (skb_shared(skb)) { | |
611 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
612 | } else { | |
613 | copy_skb = skb_get(skb); | |
614 | skb_head = skb->data; | |
615 | } | |
616 | if (copy_skb) | |
617 | skb_set_owner_r(copy_skb, sk); | |
618 | } | |
619 | snaplen = po->frame_size - macoff; | |
620 | if ((int)snaplen < 0) | |
621 | snaplen = 0; | |
622 | } | |
1da177e4 LT |
623 | |
624 | spin_lock(&sk->sk_receive_queue.lock); | |
625 | h = (struct tpacket_hdr *)packet_lookup_frame(po, po->head); | |
626 | ||
627 | if (h->tp_status) | |
628 | goto ring_is_full; | |
629 | po->head = po->head != po->frame_max ? po->head+1 : 0; | |
630 | po->stats.tp_packets++; | |
631 | if (copy_skb) { | |
632 | status |= TP_STATUS_COPY; | |
633 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
634 | } | |
635 | if (!po->stats.tp_drops) | |
636 | status &= ~TP_STATUS_LOSING; | |
637 | spin_unlock(&sk->sk_receive_queue.lock); | |
638 | ||
cbe21d8f | 639 | skb_copy_bits(skb, 0, (u8*)h + macoff, snaplen); |
1da177e4 LT |
640 | |
641 | h->tp_len = skb->len; | |
642 | h->tp_snaplen = snaplen; | |
643 | h->tp_mac = macoff; | |
644 | h->tp_net = netoff; | |
a61bbcf2 PM |
645 | if (skb->tstamp.off_sec == 0) { |
646 | __net_timestamp(skb); | |
1da177e4 LT |
647 | sock_enable_timestamp(sk); |
648 | } | |
325ed823 HX |
649 | h->tp_sec = skb->tstamp.off_sec; |
650 | h->tp_usec = skb->tstamp.off_usec; | |
1da177e4 LT |
651 | |
652 | sll = (struct sockaddr_ll*)((u8*)h + TPACKET_ALIGN(sizeof(*h))); | |
653 | sll->sll_halen = 0; | |
654 | if (dev->hard_header_parse) | |
655 | sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); | |
656 | sll->sll_family = AF_PACKET; | |
657 | sll->sll_hatype = dev->type; | |
658 | sll->sll_protocol = skb->protocol; | |
659 | sll->sll_pkttype = skb->pkt_type; | |
660 | sll->sll_ifindex = dev->ifindex; | |
661 | ||
662 | h->tp_status = status; | |
e16aa207 | 663 | smp_mb(); |
1da177e4 LT |
664 | |
665 | { | |
666 | struct page *p_start, *p_end; | |
667 | u8 *h_end = (u8 *)h + macoff + snaplen - 1; | |
668 | ||
669 | p_start = virt_to_page(h); | |
670 | p_end = virt_to_page(h_end); | |
671 | while (p_start <= p_end) { | |
672 | flush_dcache_page(p_start); | |
673 | p_start++; | |
674 | } | |
675 | } | |
676 | ||
677 | sk->sk_data_ready(sk, 0); | |
678 | ||
679 | drop_n_restore: | |
680 | if (skb_head != skb->data && skb_shared(skb)) { | |
681 | skb->data = skb_head; | |
682 | skb->len = skb_len; | |
683 | } | |
684 | drop: | |
685 | kfree_skb(skb); | |
686 | return 0; | |
687 | ||
688 | ring_is_full: | |
689 | po->stats.tp_drops++; | |
690 | spin_unlock(&sk->sk_receive_queue.lock); | |
691 | ||
692 | sk->sk_data_ready(sk, 0); | |
693 | if (copy_skb) | |
694 | kfree_skb(copy_skb); | |
695 | goto drop_n_restore; | |
696 | } | |
697 | ||
698 | #endif | |
699 | ||
700 | ||
701 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, | |
702 | struct msghdr *msg, size_t len) | |
703 | { | |
704 | struct sock *sk = sock->sk; | |
705 | struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name; | |
706 | struct sk_buff *skb; | |
707 | struct net_device *dev; | |
0e11c91e | 708 | __be16 proto; |
1da177e4 LT |
709 | unsigned char *addr; |
710 | int ifindex, err, reserve = 0; | |
711 | ||
712 | /* | |
713 | * Get and verify the address. | |
714 | */ | |
715 | ||
716 | if (saddr == NULL) { | |
717 | struct packet_sock *po = pkt_sk(sk); | |
718 | ||
719 | ifindex = po->ifindex; | |
720 | proto = po->num; | |
721 | addr = NULL; | |
722 | } else { | |
723 | err = -EINVAL; | |
724 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
725 | goto out; | |
0fb375fb EB |
726 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
727 | goto out; | |
1da177e4 LT |
728 | ifindex = saddr->sll_ifindex; |
729 | proto = saddr->sll_protocol; | |
730 | addr = saddr->sll_addr; | |
731 | } | |
732 | ||
733 | ||
734 | dev = dev_get_by_index(ifindex); | |
735 | err = -ENXIO; | |
736 | if (dev == NULL) | |
737 | goto out_unlock; | |
738 | if (sock->type == SOCK_RAW) | |
739 | reserve = dev->hard_header_len; | |
740 | ||
d5e76b0a DM |
741 | err = -ENETDOWN; |
742 | if (!(dev->flags & IFF_UP)) | |
743 | goto out_unlock; | |
744 | ||
1da177e4 LT |
745 | err = -EMSGSIZE; |
746 | if (len > dev->mtu+reserve) | |
747 | goto out_unlock; | |
748 | ||
749 | skb = sock_alloc_send_skb(sk, len + LL_RESERVED_SPACE(dev), | |
750 | msg->msg_flags & MSG_DONTWAIT, &err); | |
751 | if (skb==NULL) | |
752 | goto out_unlock; | |
753 | ||
754 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
755 | skb->nh.raw = skb->data; | |
756 | ||
757 | if (dev->hard_header) { | |
758 | int res; | |
759 | err = -EINVAL; | |
760 | res = dev->hard_header(skb, dev, ntohs(proto), addr, NULL, len); | |
761 | if (sock->type != SOCK_DGRAM) { | |
762 | skb->tail = skb->data; | |
763 | skb->len = 0; | |
764 | } else if (res < 0) | |
765 | goto out_free; | |
766 | } | |
767 | ||
768 | /* Returns -EFAULT on error */ | |
769 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); | |
770 | if (err) | |
771 | goto out_free; | |
772 | ||
773 | skb->protocol = proto; | |
774 | skb->dev = dev; | |
775 | skb->priority = sk->sk_priority; | |
776 | ||
1da177e4 LT |
777 | /* |
778 | * Now send it | |
779 | */ | |
780 | ||
781 | err = dev_queue_xmit(skb); | |
782 | if (err > 0 && (err = net_xmit_errno(err)) != 0) | |
783 | goto out_unlock; | |
784 | ||
785 | dev_put(dev); | |
786 | ||
787 | return(len); | |
788 | ||
789 | out_free: | |
790 | kfree_skb(skb); | |
791 | out_unlock: | |
792 | if (dev) | |
793 | dev_put(dev); | |
794 | out: | |
795 | return err; | |
796 | } | |
797 | ||
798 | /* | |
799 | * Close a PACKET socket. This is fairly simple. We immediately go | |
800 | * to 'closed' state and remove our protocol entry in the device list. | |
801 | */ | |
802 | ||
803 | static int packet_release(struct socket *sock) | |
804 | { | |
805 | struct sock *sk = sock->sk; | |
806 | struct packet_sock *po; | |
807 | ||
808 | if (!sk) | |
809 | return 0; | |
810 | ||
811 | po = pkt_sk(sk); | |
812 | ||
813 | write_lock_bh(&packet_sklist_lock); | |
814 | sk_del_node_init(sk); | |
815 | write_unlock_bh(&packet_sklist_lock); | |
816 | ||
817 | /* | |
818 | * Unhook packet receive handler. | |
819 | */ | |
820 | ||
821 | if (po->running) { | |
822 | /* | |
823 | * Remove the protocol hook | |
824 | */ | |
825 | dev_remove_pack(&po->prot_hook); | |
826 | po->running = 0; | |
827 | po->num = 0; | |
828 | __sock_put(sk); | |
829 | } | |
830 | ||
831 | #ifdef CONFIG_PACKET_MULTICAST | |
832 | packet_flush_mclist(sk); | |
833 | #endif | |
834 | ||
835 | #ifdef CONFIG_PACKET_MMAP | |
836 | if (po->pg_vec) { | |
837 | struct tpacket_req req; | |
838 | memset(&req, 0, sizeof(req)); | |
839 | packet_set_ring(sk, &req, 1); | |
840 | } | |
841 | #endif | |
842 | ||
843 | /* | |
844 | * Now the socket is dead. No more input will appear. | |
845 | */ | |
846 | ||
847 | sock_orphan(sk); | |
848 | sock->sk = NULL; | |
849 | ||
850 | /* Purge queues */ | |
851 | ||
852 | skb_queue_purge(&sk->sk_receive_queue); | |
853 | ||
854 | sock_put(sk); | |
855 | return 0; | |
856 | } | |
857 | ||
858 | /* | |
859 | * Attach a packet hook. | |
860 | */ | |
861 | ||
0e11c91e | 862 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
1da177e4 LT |
863 | { |
864 | struct packet_sock *po = pkt_sk(sk); | |
865 | /* | |
866 | * Detach an existing hook if present. | |
867 | */ | |
868 | ||
869 | lock_sock(sk); | |
870 | ||
871 | spin_lock(&po->bind_lock); | |
872 | if (po->running) { | |
873 | __sock_put(sk); | |
874 | po->running = 0; | |
875 | po->num = 0; | |
876 | spin_unlock(&po->bind_lock); | |
877 | dev_remove_pack(&po->prot_hook); | |
878 | spin_lock(&po->bind_lock); | |
879 | } | |
880 | ||
881 | po->num = protocol; | |
882 | po->prot_hook.type = protocol; | |
883 | po->prot_hook.dev = dev; | |
884 | ||
885 | po->ifindex = dev ? dev->ifindex : 0; | |
886 | ||
887 | if (protocol == 0) | |
888 | goto out_unlock; | |
889 | ||
890 | if (dev) { | |
891 | if (dev->flags&IFF_UP) { | |
892 | dev_add_pack(&po->prot_hook); | |
893 | sock_hold(sk); | |
894 | po->running = 1; | |
895 | } else { | |
896 | sk->sk_err = ENETDOWN; | |
897 | if (!sock_flag(sk, SOCK_DEAD)) | |
898 | sk->sk_error_report(sk); | |
899 | } | |
900 | } else { | |
901 | dev_add_pack(&po->prot_hook); | |
902 | sock_hold(sk); | |
903 | po->running = 1; | |
904 | } | |
905 | ||
906 | out_unlock: | |
907 | spin_unlock(&po->bind_lock); | |
908 | release_sock(sk); | |
909 | return 0; | |
910 | } | |
911 | ||
912 | /* | |
913 | * Bind a packet socket to a device | |
914 | */ | |
915 | ||
916 | #ifdef CONFIG_SOCK_PACKET | |
917 | ||
918 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
919 | { | |
920 | struct sock *sk=sock->sk; | |
921 | char name[15]; | |
922 | struct net_device *dev; | |
923 | int err = -ENODEV; | |
924 | ||
925 | /* | |
926 | * Check legality | |
927 | */ | |
928 | ||
8ae55f04 | 929 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 LT |
930 | return -EINVAL; |
931 | strlcpy(name,uaddr->sa_data,sizeof(name)); | |
932 | ||
933 | dev = dev_get_by_name(name); | |
934 | if (dev) { | |
935 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); | |
936 | dev_put(dev); | |
937 | } | |
938 | return err; | |
939 | } | |
940 | #endif | |
941 | ||
942 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
943 | { | |
944 | struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; | |
945 | struct sock *sk=sock->sk; | |
946 | struct net_device *dev = NULL; | |
947 | int err; | |
948 | ||
949 | ||
950 | /* | |
951 | * Check legality | |
952 | */ | |
953 | ||
954 | if (addr_len < sizeof(struct sockaddr_ll)) | |
955 | return -EINVAL; | |
956 | if (sll->sll_family != AF_PACKET) | |
957 | return -EINVAL; | |
958 | ||
959 | if (sll->sll_ifindex) { | |
960 | err = -ENODEV; | |
961 | dev = dev_get_by_index(sll->sll_ifindex); | |
962 | if (dev == NULL) | |
963 | goto out; | |
964 | } | |
965 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
966 | if (dev) | |
967 | dev_put(dev); | |
968 | ||
969 | out: | |
970 | return err; | |
971 | } | |
972 | ||
973 | static struct proto packet_proto = { | |
974 | .name = "PACKET", | |
975 | .owner = THIS_MODULE, | |
976 | .obj_size = sizeof(struct packet_sock), | |
977 | }; | |
978 | ||
979 | /* | |
980 | * Create a packet of type SOCK_PACKET. | |
981 | */ | |
982 | ||
983 | static int packet_create(struct socket *sock, int protocol) | |
984 | { | |
985 | struct sock *sk; | |
986 | struct packet_sock *po; | |
0e11c91e | 987 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1da177e4 LT |
988 | int err; |
989 | ||
990 | if (!capable(CAP_NET_RAW)) | |
991 | return -EPERM; | |
992 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW | |
993 | #ifdef CONFIG_SOCK_PACKET | |
994 | && sock->type != SOCK_PACKET | |
995 | #endif | |
996 | ) | |
997 | return -ESOCKTNOSUPPORT; | |
998 | ||
999 | sock->state = SS_UNCONNECTED; | |
1000 | ||
1001 | err = -ENOBUFS; | |
1002 | sk = sk_alloc(PF_PACKET, GFP_KERNEL, &packet_proto, 1); | |
1003 | if (sk == NULL) | |
1004 | goto out; | |
1005 | ||
1006 | sock->ops = &packet_ops; | |
1007 | #ifdef CONFIG_SOCK_PACKET | |
1008 | if (sock->type == SOCK_PACKET) | |
1009 | sock->ops = &packet_ops_spkt; | |
1010 | #endif | |
1011 | sock_init_data(sock, sk); | |
1012 | ||
1013 | po = pkt_sk(sk); | |
1014 | sk->sk_family = PF_PACKET; | |
0e11c91e | 1015 | po->num = proto; |
1da177e4 LT |
1016 | |
1017 | sk->sk_destruct = packet_sock_destruct; | |
1018 | atomic_inc(&packet_socks_nr); | |
1019 | ||
1020 | /* | |
1021 | * Attach a protocol block | |
1022 | */ | |
1023 | ||
1024 | spin_lock_init(&po->bind_lock); | |
1025 | po->prot_hook.func = packet_rcv; | |
1026 | #ifdef CONFIG_SOCK_PACKET | |
1027 | if (sock->type == SOCK_PACKET) | |
1028 | po->prot_hook.func = packet_rcv_spkt; | |
1029 | #endif | |
1030 | po->prot_hook.af_packet_priv = sk; | |
1031 | ||
0e11c91e AV |
1032 | if (proto) { |
1033 | po->prot_hook.type = proto; | |
1da177e4 LT |
1034 | dev_add_pack(&po->prot_hook); |
1035 | sock_hold(sk); | |
1036 | po->running = 1; | |
1037 | } | |
1038 | ||
1039 | write_lock_bh(&packet_sklist_lock); | |
1040 | sk_add_node(sk, &packet_sklist); | |
1041 | write_unlock_bh(&packet_sklist_lock); | |
1042 | return(0); | |
1043 | out: | |
1044 | return err; | |
1045 | } | |
1046 | ||
1047 | /* | |
1048 | * Pull a packet from our receive queue and hand it to the user. | |
1049 | * If necessary we block. | |
1050 | */ | |
1051 | ||
1052 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1053 | struct msghdr *msg, size_t len, int flags) | |
1054 | { | |
1055 | struct sock *sk = sock->sk; | |
1056 | struct sk_buff *skb; | |
1057 | int copied, err; | |
0fb375fb | 1058 | struct sockaddr_ll *sll; |
1da177e4 LT |
1059 | |
1060 | err = -EINVAL; | |
1061 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) | |
1062 | goto out; | |
1063 | ||
1064 | #if 0 | |
1065 | /* What error should we return now? EUNATTACH? */ | |
1066 | if (pkt_sk(sk)->ifindex < 0) | |
1067 | return -ENODEV; | |
1068 | #endif | |
1069 | ||
1da177e4 LT |
1070 | /* |
1071 | * Call the generic datagram receiver. This handles all sorts | |
1072 | * of horrible races and re-entrancy so we can forget about it | |
1073 | * in the protocol layers. | |
1074 | * | |
1075 | * Now it will return ENETDOWN, if device have just gone down, | |
1076 | * but then it will block. | |
1077 | */ | |
1078 | ||
1079 | skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&err); | |
1080 | ||
1081 | /* | |
1082 | * An error occurred so return it. Because skb_recv_datagram() | |
1083 | * handles the blocking we don't see and worry about blocking | |
1084 | * retries. | |
1085 | */ | |
1086 | ||
8ae55f04 | 1087 | if (skb == NULL) |
1da177e4 LT |
1088 | goto out; |
1089 | ||
0fb375fb EB |
1090 | /* |
1091 | * If the address length field is there to be filled in, we fill | |
1092 | * it in now. | |
1093 | */ | |
1094 | ||
1095 | sll = (struct sockaddr_ll*)skb->cb; | |
1096 | if (sock->type == SOCK_PACKET) | |
1097 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
1098 | else | |
1099 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); | |
1100 | ||
1da177e4 LT |
1101 | /* |
1102 | * You lose any data beyond the buffer you gave. If it worries a | |
1103 | * user program they can ask the device for its MTU anyway. | |
1104 | */ | |
1105 | ||
1106 | copied = skb->len; | |
1107 | if (copied > len) | |
1108 | { | |
1109 | copied=len; | |
1110 | msg->msg_flags|=MSG_TRUNC; | |
1111 | } | |
1112 | ||
1113 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1114 | if (err) | |
1115 | goto out_free; | |
1116 | ||
1117 | sock_recv_timestamp(msg, sk, skb); | |
1118 | ||
1119 | if (msg->msg_name) | |
1120 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
1121 | ||
1122 | /* | |
1123 | * Free or return the buffer as appropriate. Again this | |
1124 | * hides all the races and re-entrancy issues from us. | |
1125 | */ | |
1126 | err = (flags&MSG_TRUNC) ? skb->len : copied; | |
1127 | ||
1128 | out_free: | |
1129 | skb_free_datagram(sk, skb); | |
1130 | out: | |
1131 | return err; | |
1132 | } | |
1133 | ||
1134 | #ifdef CONFIG_SOCK_PACKET | |
1135 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, | |
1136 | int *uaddr_len, int peer) | |
1137 | { | |
1138 | struct net_device *dev; | |
1139 | struct sock *sk = sock->sk; | |
1140 | ||
1141 | if (peer) | |
1142 | return -EOPNOTSUPP; | |
1143 | ||
1144 | uaddr->sa_family = AF_PACKET; | |
1145 | dev = dev_get_by_index(pkt_sk(sk)->ifindex); | |
1146 | if (dev) { | |
1147 | strlcpy(uaddr->sa_data, dev->name, 15); | |
1148 | dev_put(dev); | |
1149 | } else | |
1150 | memset(uaddr->sa_data, 0, 14); | |
1151 | *uaddr_len = sizeof(*uaddr); | |
1152 | ||
1153 | return 0; | |
1154 | } | |
1155 | #endif | |
1156 | ||
1157 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
1158 | int *uaddr_len, int peer) | |
1159 | { | |
1160 | struct net_device *dev; | |
1161 | struct sock *sk = sock->sk; | |
1162 | struct packet_sock *po = pkt_sk(sk); | |
1163 | struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; | |
1164 | ||
1165 | if (peer) | |
1166 | return -EOPNOTSUPP; | |
1167 | ||
1168 | sll->sll_family = AF_PACKET; | |
1169 | sll->sll_ifindex = po->ifindex; | |
1170 | sll->sll_protocol = po->num; | |
1171 | dev = dev_get_by_index(po->ifindex); | |
1172 | if (dev) { | |
1173 | sll->sll_hatype = dev->type; | |
1174 | sll->sll_halen = dev->addr_len; | |
1175 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1176 | dev_put(dev); | |
1177 | } else { | |
1178 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
1179 | sll->sll_halen = 0; | |
1180 | } | |
0fb375fb | 1181 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
1182 | |
1183 | return 0; | |
1184 | } | |
1185 | ||
1186 | #ifdef CONFIG_PACKET_MULTICAST | |
1187 | static void packet_dev_mc(struct net_device *dev, struct packet_mclist *i, int what) | |
1188 | { | |
1189 | switch (i->type) { | |
1190 | case PACKET_MR_MULTICAST: | |
1191 | if (what > 0) | |
1192 | dev_mc_add(dev, i->addr, i->alen, 0); | |
1193 | else | |
1194 | dev_mc_delete(dev, i->addr, i->alen, 0); | |
1195 | break; | |
1196 | case PACKET_MR_PROMISC: | |
1197 | dev_set_promiscuity(dev, what); | |
1198 | break; | |
1199 | case PACKET_MR_ALLMULTI: | |
1200 | dev_set_allmulti(dev, what); | |
1201 | break; | |
1202 | default:; | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
1207 | { | |
1208 | for ( ; i; i=i->next) { | |
1209 | if (i->ifindex == dev->ifindex) | |
1210 | packet_dev_mc(dev, i, what); | |
1211 | } | |
1212 | } | |
1213 | ||
0fb375fb | 1214 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1215 | { |
1216 | struct packet_sock *po = pkt_sk(sk); | |
1217 | struct packet_mclist *ml, *i; | |
1218 | struct net_device *dev; | |
1219 | int err; | |
1220 | ||
1221 | rtnl_lock(); | |
1222 | ||
1223 | err = -ENODEV; | |
1224 | dev = __dev_get_by_index(mreq->mr_ifindex); | |
1225 | if (!dev) | |
1226 | goto done; | |
1227 | ||
1228 | err = -EINVAL; | |
1229 | if (mreq->mr_alen > dev->addr_len) | |
1230 | goto done; | |
1231 | ||
1232 | err = -ENOBUFS; | |
8b3a7005 | 1233 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
1234 | if (i == NULL) |
1235 | goto done; | |
1236 | ||
1237 | err = 0; | |
1238 | for (ml = po->mclist; ml; ml = ml->next) { | |
1239 | if (ml->ifindex == mreq->mr_ifindex && | |
1240 | ml->type == mreq->mr_type && | |
1241 | ml->alen == mreq->mr_alen && | |
1242 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1243 | ml->count++; | |
1244 | /* Free the new element ... */ | |
1245 | kfree(i); | |
1246 | goto done; | |
1247 | } | |
1248 | } | |
1249 | ||
1250 | i->type = mreq->mr_type; | |
1251 | i->ifindex = mreq->mr_ifindex; | |
1252 | i->alen = mreq->mr_alen; | |
1253 | memcpy(i->addr, mreq->mr_address, i->alen); | |
1254 | i->count = 1; | |
1255 | i->next = po->mclist; | |
1256 | po->mclist = i; | |
1257 | packet_dev_mc(dev, i, +1); | |
1258 | ||
1259 | done: | |
1260 | rtnl_unlock(); | |
1261 | return err; | |
1262 | } | |
1263 | ||
0fb375fb | 1264 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1265 | { |
1266 | struct packet_mclist *ml, **mlp; | |
1267 | ||
1268 | rtnl_lock(); | |
1269 | ||
1270 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
1271 | if (ml->ifindex == mreq->mr_ifindex && | |
1272 | ml->type == mreq->mr_type && | |
1273 | ml->alen == mreq->mr_alen && | |
1274 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1275 | if (--ml->count == 0) { | |
1276 | struct net_device *dev; | |
1277 | *mlp = ml->next; | |
1278 | dev = dev_get_by_index(ml->ifindex); | |
1279 | if (dev) { | |
1280 | packet_dev_mc(dev, ml, -1); | |
1281 | dev_put(dev); | |
1282 | } | |
1283 | kfree(ml); | |
1284 | } | |
1285 | rtnl_unlock(); | |
1286 | return 0; | |
1287 | } | |
1288 | } | |
1289 | rtnl_unlock(); | |
1290 | return -EADDRNOTAVAIL; | |
1291 | } | |
1292 | ||
1293 | static void packet_flush_mclist(struct sock *sk) | |
1294 | { | |
1295 | struct packet_sock *po = pkt_sk(sk); | |
1296 | struct packet_mclist *ml; | |
1297 | ||
1298 | if (!po->mclist) | |
1299 | return; | |
1300 | ||
1301 | rtnl_lock(); | |
1302 | while ((ml = po->mclist) != NULL) { | |
1303 | struct net_device *dev; | |
1304 | ||
1305 | po->mclist = ml->next; | |
1306 | if ((dev = dev_get_by_index(ml->ifindex)) != NULL) { | |
1307 | packet_dev_mc(dev, ml, -1); | |
1308 | dev_put(dev); | |
1309 | } | |
1310 | kfree(ml); | |
1311 | } | |
1312 | rtnl_unlock(); | |
1313 | } | |
1314 | #endif | |
1315 | ||
1316 | static int | |
1317 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) | |
1318 | { | |
1319 | struct sock *sk = sock->sk; | |
1320 | int ret; | |
1321 | ||
1322 | if (level != SOL_PACKET) | |
1323 | return -ENOPROTOOPT; | |
1324 | ||
1325 | switch(optname) { | |
1326 | #ifdef CONFIG_PACKET_MULTICAST | |
1327 | case PACKET_ADD_MEMBERSHIP: | |
1328 | case PACKET_DROP_MEMBERSHIP: | |
1329 | { | |
0fb375fb EB |
1330 | struct packet_mreq_max mreq; |
1331 | int len = optlen; | |
1332 | memset(&mreq, 0, sizeof(mreq)); | |
1333 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 1334 | return -EINVAL; |
0fb375fb EB |
1335 | if (len > sizeof(mreq)) |
1336 | len = sizeof(mreq); | |
1337 | if (copy_from_user(&mreq,optval,len)) | |
1da177e4 | 1338 | return -EFAULT; |
0fb375fb EB |
1339 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
1340 | return -EINVAL; | |
1da177e4 LT |
1341 | if (optname == PACKET_ADD_MEMBERSHIP) |
1342 | ret = packet_mc_add(sk, &mreq); | |
1343 | else | |
1344 | ret = packet_mc_drop(sk, &mreq); | |
1345 | return ret; | |
1346 | } | |
1347 | #endif | |
1348 | #ifdef CONFIG_PACKET_MMAP | |
1349 | case PACKET_RX_RING: | |
1350 | { | |
1351 | struct tpacket_req req; | |
1352 | ||
1353 | if (optlen<sizeof(req)) | |
1354 | return -EINVAL; | |
1355 | if (copy_from_user(&req,optval,sizeof(req))) | |
1356 | return -EFAULT; | |
1357 | return packet_set_ring(sk, &req, 0); | |
1358 | } | |
1359 | case PACKET_COPY_THRESH: | |
1360 | { | |
1361 | int val; | |
1362 | ||
1363 | if (optlen!=sizeof(val)) | |
1364 | return -EINVAL; | |
1365 | if (copy_from_user(&val,optval,sizeof(val))) | |
1366 | return -EFAULT; | |
1367 | ||
1368 | pkt_sk(sk)->copy_thresh = val; | |
1369 | return 0; | |
1370 | } | |
1371 | #endif | |
1372 | default: | |
1373 | return -ENOPROTOOPT; | |
1374 | } | |
1375 | } | |
1376 | ||
1377 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
1378 | char __user *optval, int __user *optlen) | |
1379 | { | |
1380 | int len; | |
1381 | struct sock *sk = sock->sk; | |
1382 | struct packet_sock *po = pkt_sk(sk); | |
1383 | ||
1384 | if (level != SOL_PACKET) | |
1385 | return -ENOPROTOOPT; | |
1386 | ||
8ae55f04 KK |
1387 | if (get_user(len, optlen)) |
1388 | return -EFAULT; | |
1da177e4 LT |
1389 | |
1390 | if (len < 0) | |
1391 | return -EINVAL; | |
1392 | ||
1393 | switch(optname) { | |
1394 | case PACKET_STATISTICS: | |
1395 | { | |
1396 | struct tpacket_stats st; | |
1397 | ||
1398 | if (len > sizeof(struct tpacket_stats)) | |
1399 | len = sizeof(struct tpacket_stats); | |
1400 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1401 | st = po->stats; | |
1402 | memset(&po->stats, 0, sizeof(st)); | |
1403 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1404 | st.tp_packets += st.tp_drops; | |
1405 | ||
1406 | if (copy_to_user(optval, &st, len)) | |
1407 | return -EFAULT; | |
1408 | break; | |
1409 | } | |
1410 | default: | |
1411 | return -ENOPROTOOPT; | |
1412 | } | |
1413 | ||
8ae55f04 KK |
1414 | if (put_user(len, optlen)) |
1415 | return -EFAULT; | |
1416 | return 0; | |
1da177e4 LT |
1417 | } |
1418 | ||
1419 | ||
1420 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) | |
1421 | { | |
1422 | struct sock *sk; | |
1423 | struct hlist_node *node; | |
1424 | struct net_device *dev = (struct net_device*)data; | |
1425 | ||
1426 | read_lock(&packet_sklist_lock); | |
1427 | sk_for_each(sk, node, &packet_sklist) { | |
1428 | struct packet_sock *po = pkt_sk(sk); | |
1429 | ||
1430 | switch (msg) { | |
1431 | case NETDEV_UNREGISTER: | |
1432 | #ifdef CONFIG_PACKET_MULTICAST | |
1433 | if (po->mclist) | |
1434 | packet_dev_mclist(dev, po->mclist, -1); | |
1435 | // fallthrough | |
1436 | #endif | |
1437 | case NETDEV_DOWN: | |
1438 | if (dev->ifindex == po->ifindex) { | |
1439 | spin_lock(&po->bind_lock); | |
1440 | if (po->running) { | |
1441 | __dev_remove_pack(&po->prot_hook); | |
1442 | __sock_put(sk); | |
1443 | po->running = 0; | |
1444 | sk->sk_err = ENETDOWN; | |
1445 | if (!sock_flag(sk, SOCK_DEAD)) | |
1446 | sk->sk_error_report(sk); | |
1447 | } | |
1448 | if (msg == NETDEV_UNREGISTER) { | |
1449 | po->ifindex = -1; | |
1450 | po->prot_hook.dev = NULL; | |
1451 | } | |
1452 | spin_unlock(&po->bind_lock); | |
1453 | } | |
1454 | break; | |
1455 | case NETDEV_UP: | |
1456 | spin_lock(&po->bind_lock); | |
1457 | if (dev->ifindex == po->ifindex && po->num && | |
1458 | !po->running) { | |
1459 | dev_add_pack(&po->prot_hook); | |
1460 | sock_hold(sk); | |
1461 | po->running = 1; | |
1462 | } | |
1463 | spin_unlock(&po->bind_lock); | |
1464 | break; | |
1465 | } | |
1466 | } | |
1467 | read_unlock(&packet_sklist_lock); | |
1468 | return NOTIFY_DONE; | |
1469 | } | |
1470 | ||
1471 | ||
1472 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
1473 | unsigned long arg) | |
1474 | { | |
1475 | struct sock *sk = sock->sk; | |
1476 | ||
1477 | switch(cmd) { | |
1478 | case SIOCOUTQ: | |
1479 | { | |
1480 | int amount = atomic_read(&sk->sk_wmem_alloc); | |
1481 | return put_user(amount, (int __user *)arg); | |
1482 | } | |
1483 | case SIOCINQ: | |
1484 | { | |
1485 | struct sk_buff *skb; | |
1486 | int amount = 0; | |
1487 | ||
1488 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1489 | skb = skb_peek(&sk->sk_receive_queue); | |
1490 | if (skb) | |
1491 | amount = skb->len; | |
1492 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1493 | return put_user(amount, (int __user *)arg); | |
1494 | } | |
1495 | case SIOCGSTAMP: | |
1496 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
1497 | ||
1498 | #ifdef CONFIG_INET | |
1499 | case SIOCADDRT: | |
1500 | case SIOCDELRT: | |
1501 | case SIOCDARP: | |
1502 | case SIOCGARP: | |
1503 | case SIOCSARP: | |
1504 | case SIOCGIFADDR: | |
1505 | case SIOCSIFADDR: | |
1506 | case SIOCGIFBRDADDR: | |
1507 | case SIOCSIFBRDADDR: | |
1508 | case SIOCGIFNETMASK: | |
1509 | case SIOCSIFNETMASK: | |
1510 | case SIOCGIFDSTADDR: | |
1511 | case SIOCSIFDSTADDR: | |
1512 | case SIOCSIFFLAGS: | |
1513 | return inet_dgram_ops.ioctl(sock, cmd, arg); | |
1514 | #endif | |
1515 | ||
1516 | default: | |
b5e5fa5e | 1517 | return -ENOIOCTLCMD; |
1da177e4 LT |
1518 | } |
1519 | return 0; | |
1520 | } | |
1521 | ||
1522 | #ifndef CONFIG_PACKET_MMAP | |
1523 | #define packet_mmap sock_no_mmap | |
1524 | #define packet_poll datagram_poll | |
1525 | #else | |
1526 | ||
1527 | static unsigned int packet_poll(struct file * file, struct socket *sock, | |
1528 | poll_table *wait) | |
1529 | { | |
1530 | struct sock *sk = sock->sk; | |
1531 | struct packet_sock *po = pkt_sk(sk); | |
1532 | unsigned int mask = datagram_poll(file, sock, wait); | |
1533 | ||
1534 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1535 | if (po->pg_vec) { | |
1536 | unsigned last = po->head ? po->head-1 : po->frame_max; | |
1537 | struct tpacket_hdr *h; | |
1538 | ||
1539 | h = (struct tpacket_hdr *)packet_lookup_frame(po, last); | |
1540 | ||
1541 | if (h->tp_status) | |
1542 | mask |= POLLIN | POLLRDNORM; | |
1543 | } | |
1544 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1545 | return mask; | |
1546 | } | |
1547 | ||
1548 | ||
1549 | /* Dirty? Well, I still did not learn better way to account | |
1550 | * for user mmaps. | |
1551 | */ | |
1552 | ||
1553 | static void packet_mm_open(struct vm_area_struct *vma) | |
1554 | { | |
1555 | struct file *file = vma->vm_file; | |
b69aee04 | 1556 | struct socket * sock = file->private_data; |
1da177e4 LT |
1557 | struct sock *sk = sock->sk; |
1558 | ||
1559 | if (sk) | |
1560 | atomic_inc(&pkt_sk(sk)->mapped); | |
1561 | } | |
1562 | ||
1563 | static void packet_mm_close(struct vm_area_struct *vma) | |
1564 | { | |
1565 | struct file *file = vma->vm_file; | |
b69aee04 | 1566 | struct socket * sock = file->private_data; |
1da177e4 LT |
1567 | struct sock *sk = sock->sk; |
1568 | ||
1569 | if (sk) | |
1570 | atomic_dec(&pkt_sk(sk)->mapped); | |
1571 | } | |
1572 | ||
1573 | static struct vm_operations_struct packet_mmap_ops = { | |
1574 | .open = packet_mm_open, | |
1575 | .close =packet_mm_close, | |
1576 | }; | |
1577 | ||
1578 | static inline struct page *pg_vec_endpage(char *one_pg_vec, unsigned int order) | |
1579 | { | |
1580 | return virt_to_page(one_pg_vec + (PAGE_SIZE << order) - 1); | |
1581 | } | |
1582 | ||
4ebf0ae2 | 1583 | static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len) |
1da177e4 LT |
1584 | { |
1585 | int i; | |
1586 | ||
4ebf0ae2 DM |
1587 | for (i = 0; i < len; i++) { |
1588 | if (likely(pg_vec[i])) | |
1589 | free_pages((unsigned long) pg_vec[i], order); | |
1da177e4 LT |
1590 | } |
1591 | kfree(pg_vec); | |
1592 | } | |
1593 | ||
4ebf0ae2 DM |
1594 | static inline char *alloc_one_pg_vec_page(unsigned long order) |
1595 | { | |
1596 | return (char *) __get_free_pages(GFP_KERNEL | __GFP_COMP | __GFP_ZERO, | |
1597 | order); | |
1598 | } | |
1599 | ||
1600 | static char **alloc_pg_vec(struct tpacket_req *req, int order) | |
1601 | { | |
1602 | unsigned int block_nr = req->tp_block_nr; | |
1603 | char **pg_vec; | |
1604 | int i; | |
1605 | ||
1606 | pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL); | |
1607 | if (unlikely(!pg_vec)) | |
1608 | goto out; | |
1609 | ||
1610 | for (i = 0; i < block_nr; i++) { | |
1611 | pg_vec[i] = alloc_one_pg_vec_page(order); | |
1612 | if (unlikely(!pg_vec[i])) | |
1613 | goto out_free_pgvec; | |
1614 | } | |
1615 | ||
1616 | out: | |
1617 | return pg_vec; | |
1618 | ||
1619 | out_free_pgvec: | |
1620 | free_pg_vec(pg_vec, order, block_nr); | |
1621 | pg_vec = NULL; | |
1622 | goto out; | |
1623 | } | |
1da177e4 LT |
1624 | |
1625 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing) | |
1626 | { | |
1627 | char **pg_vec = NULL; | |
1628 | struct packet_sock *po = pkt_sk(sk); | |
0e11c91e AV |
1629 | int was_running, order = 0; |
1630 | __be16 num; | |
1da177e4 LT |
1631 | int err = 0; |
1632 | ||
1633 | if (req->tp_block_nr) { | |
1634 | int i, l; | |
1635 | ||
1636 | /* Sanity tests and some calculations */ | |
1637 | ||
4ebf0ae2 | 1638 | if (unlikely(po->pg_vec)) |
1da177e4 LT |
1639 | return -EBUSY; |
1640 | ||
4ebf0ae2 | 1641 | if (unlikely((int)req->tp_block_size <= 0)) |
1da177e4 | 1642 | return -EINVAL; |
4ebf0ae2 | 1643 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
1da177e4 | 1644 | return -EINVAL; |
4ebf0ae2 | 1645 | if (unlikely(req->tp_frame_size < TPACKET_HDRLEN)) |
1da177e4 | 1646 | return -EINVAL; |
4ebf0ae2 | 1647 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
1da177e4 LT |
1648 | return -EINVAL; |
1649 | ||
1650 | po->frames_per_block = req->tp_block_size/req->tp_frame_size; | |
4ebf0ae2 | 1651 | if (unlikely(po->frames_per_block <= 0)) |
1da177e4 | 1652 | return -EINVAL; |
4ebf0ae2 DM |
1653 | if (unlikely((po->frames_per_block * req->tp_block_nr) != |
1654 | req->tp_frame_nr)) | |
1da177e4 | 1655 | return -EINVAL; |
1da177e4 LT |
1656 | |
1657 | err = -ENOMEM; | |
4ebf0ae2 DM |
1658 | order = get_order(req->tp_block_size); |
1659 | pg_vec = alloc_pg_vec(req, order); | |
1660 | if (unlikely(!pg_vec)) | |
1da177e4 | 1661 | goto out; |
1da177e4 LT |
1662 | |
1663 | l = 0; | |
4ebf0ae2 | 1664 | for (i = 0; i < req->tp_block_nr; i++) { |
1da177e4 LT |
1665 | char *ptr = pg_vec[i]; |
1666 | struct tpacket_hdr *header; | |
1667 | int k; | |
1668 | ||
4ebf0ae2 DM |
1669 | for (k = 0; k < po->frames_per_block; k++) { |
1670 | header = (struct tpacket_hdr *) ptr; | |
1da177e4 LT |
1671 | header->tp_status = TP_STATUS_KERNEL; |
1672 | ptr += req->tp_frame_size; | |
1673 | } | |
1674 | } | |
1675 | /* Done */ | |
1676 | } else { | |
4ebf0ae2 | 1677 | if (unlikely(req->tp_frame_nr)) |
1da177e4 LT |
1678 | return -EINVAL; |
1679 | } | |
1680 | ||
1681 | lock_sock(sk); | |
1682 | ||
1683 | /* Detach socket from network */ | |
1684 | spin_lock(&po->bind_lock); | |
1685 | was_running = po->running; | |
1686 | num = po->num; | |
1687 | if (was_running) { | |
1688 | __dev_remove_pack(&po->prot_hook); | |
1689 | po->num = 0; | |
1690 | po->running = 0; | |
1691 | __sock_put(sk); | |
1692 | } | |
1693 | spin_unlock(&po->bind_lock); | |
1694 | ||
1695 | synchronize_net(); | |
1696 | ||
1697 | err = -EBUSY; | |
1698 | if (closing || atomic_read(&po->mapped) == 0) { | |
1699 | err = 0; | |
1700 | #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) | |
1701 | ||
1702 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1703 | pg_vec = XC(po->pg_vec, pg_vec); | |
4ebf0ae2 | 1704 | po->frame_max = (req->tp_frame_nr - 1); |
1da177e4 LT |
1705 | po->head = 0; |
1706 | po->frame_size = req->tp_frame_size; | |
1707 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1708 | ||
1709 | order = XC(po->pg_vec_order, order); | |
1710 | req->tp_block_nr = XC(po->pg_vec_len, req->tp_block_nr); | |
1711 | ||
1712 | po->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
1713 | po->prot_hook.func = po->pg_vec ? tpacket_rcv : packet_rcv; | |
1714 | skb_queue_purge(&sk->sk_receive_queue); | |
1715 | #undef XC | |
1716 | if (atomic_read(&po->mapped)) | |
1717 | printk(KERN_DEBUG "packet_mmap: vma is busy: %d\n", atomic_read(&po->mapped)); | |
1718 | } | |
1719 | ||
1720 | spin_lock(&po->bind_lock); | |
1721 | if (was_running && !po->running) { | |
1722 | sock_hold(sk); | |
1723 | po->running = 1; | |
1724 | po->num = num; | |
1725 | dev_add_pack(&po->prot_hook); | |
1726 | } | |
1727 | spin_unlock(&po->bind_lock); | |
1728 | ||
1729 | release_sock(sk); | |
1730 | ||
1da177e4 LT |
1731 | if (pg_vec) |
1732 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
1733 | out: | |
1734 | return err; | |
1735 | } | |
1736 | ||
1737 | static int packet_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
1738 | { | |
1739 | struct sock *sk = sock->sk; | |
1740 | struct packet_sock *po = pkt_sk(sk); | |
1741 | unsigned long size; | |
1742 | unsigned long start; | |
1743 | int err = -EINVAL; | |
1744 | int i; | |
1745 | ||
1746 | if (vma->vm_pgoff) | |
1747 | return -EINVAL; | |
1748 | ||
1749 | size = vma->vm_end - vma->vm_start; | |
1750 | ||
1751 | lock_sock(sk); | |
1752 | if (po->pg_vec == NULL) | |
1753 | goto out; | |
1754 | if (size != po->pg_vec_len*po->pg_vec_pages*PAGE_SIZE) | |
1755 | goto out; | |
1756 | ||
1da177e4 | 1757 | start = vma->vm_start; |
4ebf0ae2 DM |
1758 | for (i = 0; i < po->pg_vec_len; i++) { |
1759 | struct page *page = virt_to_page(po->pg_vec[i]); | |
1760 | int pg_num; | |
1761 | ||
1762 | for (pg_num = 0; pg_num < po->pg_vec_pages; pg_num++, page++) { | |
1763 | err = vm_insert_page(vma, start, page); | |
1764 | if (unlikely(err)) | |
1765 | goto out; | |
1766 | start += PAGE_SIZE; | |
1767 | } | |
1da177e4 | 1768 | } |
4ebf0ae2 | 1769 | atomic_inc(&po->mapped); |
1da177e4 LT |
1770 | vma->vm_ops = &packet_mmap_ops; |
1771 | err = 0; | |
1772 | ||
1773 | out: | |
1774 | release_sock(sk); | |
1775 | return err; | |
1776 | } | |
1777 | #endif | |
1778 | ||
1779 | ||
1780 | #ifdef CONFIG_SOCK_PACKET | |
90ddc4f0 | 1781 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
1782 | .family = PF_PACKET, |
1783 | .owner = THIS_MODULE, | |
1784 | .release = packet_release, | |
1785 | .bind = packet_bind_spkt, | |
1786 | .connect = sock_no_connect, | |
1787 | .socketpair = sock_no_socketpair, | |
1788 | .accept = sock_no_accept, | |
1789 | .getname = packet_getname_spkt, | |
1790 | .poll = datagram_poll, | |
1791 | .ioctl = packet_ioctl, | |
1792 | .listen = sock_no_listen, | |
1793 | .shutdown = sock_no_shutdown, | |
1794 | .setsockopt = sock_no_setsockopt, | |
1795 | .getsockopt = sock_no_getsockopt, | |
1796 | .sendmsg = packet_sendmsg_spkt, | |
1797 | .recvmsg = packet_recvmsg, | |
1798 | .mmap = sock_no_mmap, | |
1799 | .sendpage = sock_no_sendpage, | |
1800 | }; | |
1801 | #endif | |
1802 | ||
90ddc4f0 | 1803 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
1804 | .family = PF_PACKET, |
1805 | .owner = THIS_MODULE, | |
1806 | .release = packet_release, | |
1807 | .bind = packet_bind, | |
1808 | .connect = sock_no_connect, | |
1809 | .socketpair = sock_no_socketpair, | |
1810 | .accept = sock_no_accept, | |
1811 | .getname = packet_getname, | |
1812 | .poll = packet_poll, | |
1813 | .ioctl = packet_ioctl, | |
1814 | .listen = sock_no_listen, | |
1815 | .shutdown = sock_no_shutdown, | |
1816 | .setsockopt = packet_setsockopt, | |
1817 | .getsockopt = packet_getsockopt, | |
1818 | .sendmsg = packet_sendmsg, | |
1819 | .recvmsg = packet_recvmsg, | |
1820 | .mmap = packet_mmap, | |
1821 | .sendpage = sock_no_sendpage, | |
1822 | }; | |
1823 | ||
1824 | static struct net_proto_family packet_family_ops = { | |
1825 | .family = PF_PACKET, | |
1826 | .create = packet_create, | |
1827 | .owner = THIS_MODULE, | |
1828 | }; | |
1829 | ||
1830 | static struct notifier_block packet_netdev_notifier = { | |
1831 | .notifier_call =packet_notifier, | |
1832 | }; | |
1833 | ||
1834 | #ifdef CONFIG_PROC_FS | |
1835 | static inline struct sock *packet_seq_idx(loff_t off) | |
1836 | { | |
1837 | struct sock *s; | |
1838 | struct hlist_node *node; | |
1839 | ||
1840 | sk_for_each(s, node, &packet_sklist) { | |
1841 | if (!off--) | |
1842 | return s; | |
1843 | } | |
1844 | return NULL; | |
1845 | } | |
1846 | ||
1847 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
1848 | { | |
1849 | read_lock(&packet_sklist_lock); | |
1850 | return *pos ? packet_seq_idx(*pos - 1) : SEQ_START_TOKEN; | |
1851 | } | |
1852 | ||
1853 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1854 | { | |
1855 | ++*pos; | |
1856 | return (v == SEQ_START_TOKEN) | |
1857 | ? sk_head(&packet_sklist) | |
1858 | : sk_next((struct sock*)v) ; | |
1859 | } | |
1860 | ||
1861 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
1862 | { | |
1863 | read_unlock(&packet_sklist_lock); | |
1864 | } | |
1865 | ||
1866 | static int packet_seq_show(struct seq_file *seq, void *v) | |
1867 | { | |
1868 | if (v == SEQ_START_TOKEN) | |
1869 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
1870 | else { | |
1871 | struct sock *s = v; | |
1872 | const struct packet_sock *po = pkt_sk(s); | |
1873 | ||
1874 | seq_printf(seq, | |
1875 | "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", | |
1876 | s, | |
1877 | atomic_read(&s->sk_refcnt), | |
1878 | s->sk_type, | |
1879 | ntohs(po->num), | |
1880 | po->ifindex, | |
1881 | po->running, | |
1882 | atomic_read(&s->sk_rmem_alloc), | |
1883 | sock_i_uid(s), | |
1884 | sock_i_ino(s) ); | |
1885 | } | |
1886 | ||
1887 | return 0; | |
1888 | } | |
1889 | ||
1890 | static struct seq_operations packet_seq_ops = { | |
1891 | .start = packet_seq_start, | |
1892 | .next = packet_seq_next, | |
1893 | .stop = packet_seq_stop, | |
1894 | .show = packet_seq_show, | |
1895 | }; | |
1896 | ||
1897 | static int packet_seq_open(struct inode *inode, struct file *file) | |
1898 | { | |
1899 | return seq_open(file, &packet_seq_ops); | |
1900 | } | |
1901 | ||
1902 | static struct file_operations packet_seq_fops = { | |
1903 | .owner = THIS_MODULE, | |
1904 | .open = packet_seq_open, | |
1905 | .read = seq_read, | |
1906 | .llseek = seq_lseek, | |
1907 | .release = seq_release, | |
1908 | }; | |
1909 | ||
1910 | #endif | |
1911 | ||
1912 | static void __exit packet_exit(void) | |
1913 | { | |
1914 | proc_net_remove("packet"); | |
1915 | unregister_netdevice_notifier(&packet_netdev_notifier); | |
1916 | sock_unregister(PF_PACKET); | |
1917 | proto_unregister(&packet_proto); | |
1918 | } | |
1919 | ||
1920 | static int __init packet_init(void) | |
1921 | { | |
1922 | int rc = proto_register(&packet_proto, 0); | |
1923 | ||
1924 | if (rc != 0) | |
1925 | goto out; | |
1926 | ||
1927 | sock_register(&packet_family_ops); | |
1928 | register_netdevice_notifier(&packet_netdev_notifier); | |
1929 | proc_net_fops_create("packet", 0, &packet_seq_fops); | |
1930 | out: | |
1931 | return rc; | |
1932 | } | |
1933 | ||
1934 | module_init(packet_init); | |
1935 | module_exit(packet_exit); | |
1936 | MODULE_LICENSE("GPL"); | |
1937 | MODULE_ALIAS_NETPROTO(PF_PACKET); |