Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * PACKET - implements raw packet sockets. | |
7 | * | |
8 | * Version: $Id: af_packet.c,v 1.61 2002/02/08 03:57:19 davem Exp $ | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
13 | * | |
14 | * Fixes: | |
15 | * Alan Cox : verify_area() now used correctly | |
16 | * Alan Cox : new skbuff lists, look ma no backlogs! | |
17 | * Alan Cox : tidied skbuff lists. | |
18 | * Alan Cox : Now uses generic datagram routines I | |
19 | * added. Also fixed the peek/read crash | |
20 | * from all old Linux datagram code. | |
21 | * Alan Cox : Uses the improved datagram code. | |
22 | * Alan Cox : Added NULL's for socket options. | |
23 | * Alan Cox : Re-commented the code. | |
24 | * Alan Cox : Use new kernel side addressing | |
25 | * Rob Janssen : Correct MTU usage. | |
26 | * Dave Platt : Counter leaks caused by incorrect | |
27 | * interrupt locking and some slightly | |
28 | * dubious gcc output. Can you read | |
29 | * compiler: it said _VOLATILE_ | |
30 | * Richard Kooijman : Timestamp fixes. | |
31 | * Alan Cox : New buffers. Use sk->mac.raw. | |
32 | * Alan Cox : sendmsg/recvmsg support. | |
33 | * Alan Cox : Protocol setting support | |
34 | * Alexey Kuznetsov : Untied from IPv4 stack. | |
35 | * Cyrus Durgin : Fixed kerneld for kmod. | |
36 | * Michal Ostrowski : Module initialization cleanup. | |
37 | * Ulises Alonso : Frame number limit removal and | |
38 | * packet_set_ring memory leak. | |
0fb375fb EB |
39 | * Eric Biederman : Allow for > 8 byte hardware addresses. |
40 | * The convention is that longer addresses | |
41 | * will simply extend the hardware address | |
42 | * byte arrays at the end of sockaddr_ll | |
43 | * and packet_mreq. | |
1da177e4 LT |
44 | * |
45 | * This program is free software; you can redistribute it and/or | |
46 | * modify it under the terms of the GNU General Public License | |
47 | * as published by the Free Software Foundation; either version | |
48 | * 2 of the License, or (at your option) any later version. | |
49 | * | |
50 | */ | |
51 | ||
1da177e4 LT |
52 | #include <linux/types.h> |
53 | #include <linux/sched.h> | |
54 | #include <linux/mm.h> | |
4fc268d2 | 55 | #include <linux/capability.h> |
1da177e4 LT |
56 | #include <linux/fcntl.h> |
57 | #include <linux/socket.h> | |
58 | #include <linux/in.h> | |
59 | #include <linux/inet.h> | |
60 | #include <linux/netdevice.h> | |
61 | #include <linux/if_packet.h> | |
62 | #include <linux/wireless.h> | |
ffbc6111 | 63 | #include <linux/kernel.h> |
1da177e4 LT |
64 | #include <linux/kmod.h> |
65 | #include <net/ip.h> | |
66 | #include <net/protocol.h> | |
67 | #include <linux/skbuff.h> | |
68 | #include <net/sock.h> | |
69 | #include <linux/errno.h> | |
70 | #include <linux/timer.h> | |
71 | #include <asm/system.h> | |
72 | #include <asm/uaccess.h> | |
73 | #include <asm/ioctls.h> | |
74 | #include <asm/page.h> | |
a1f8e7f7 | 75 | #include <asm/cacheflush.h> |
1da177e4 LT |
76 | #include <asm/io.h> |
77 | #include <linux/proc_fs.h> | |
78 | #include <linux/seq_file.h> | |
79 | #include <linux/poll.h> | |
80 | #include <linux/module.h> | |
81 | #include <linux/init.h> | |
82 | ||
83 | #ifdef CONFIG_INET | |
84 | #include <net/inet_common.h> | |
85 | #endif | |
86 | ||
87 | #define CONFIG_SOCK_PACKET 1 | |
88 | ||
89 | /* | |
90 | Proposed replacement for SIOC{ADD,DEL}MULTI and | |
91 | IFF_PROMISC, IFF_ALLMULTI flags. | |
92 | ||
93 | It is more expensive, but I believe, | |
94 | it is really correct solution: reentereble, safe and fault tolerant. | |
95 | ||
96 | IFF_PROMISC/IFF_ALLMULTI/SIOC{ADD/DEL}MULTI are faked by keeping | |
97 | reference count and global flag, so that real status is | |
98 | (gflag|(count != 0)), so that we can use obsolete faulty interface | |
99 | not harming clever users. | |
100 | */ | |
101 | #define CONFIG_PACKET_MULTICAST 1 | |
102 | ||
103 | /* | |
104 | Assumptions: | |
105 | - if device has no dev->hard_header routine, it adds and removes ll header | |
106 | inside itself. In this case ll header is invisible outside of device, | |
107 | but higher levels still should reserve dev->hard_header_len. | |
108 | Some devices are enough clever to reallocate skb, when header | |
109 | will not fit to reserved space (tunnel), another ones are silly | |
110 | (PPP). | |
111 | - packet socket receives packets with pulled ll header, | |
112 | so that SOCK_RAW should push it back. | |
113 | ||
114 | On receive: | |
115 | ----------- | |
116 | ||
117 | Incoming, dev->hard_header!=NULL | |
118 | mac.raw -> ll header | |
119 | data -> data | |
120 | ||
121 | Outgoing, dev->hard_header!=NULL | |
122 | mac.raw -> ll header | |
123 | data -> ll header | |
124 | ||
125 | Incoming, dev->hard_header==NULL | |
126 | mac.raw -> UNKNOWN position. It is very likely, that it points to ll header. | |
127 | PPP makes it, that is wrong, because introduce assymetry | |
128 | between rx and tx paths. | |
129 | data -> data | |
130 | ||
131 | Outgoing, dev->hard_header==NULL | |
132 | mac.raw -> data. ll header is still not built! | |
133 | data -> data | |
134 | ||
135 | Resume | |
136 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. | |
137 | ||
138 | ||
139 | On transmit: | |
140 | ------------ | |
141 | ||
142 | dev->hard_header != NULL | |
143 | mac.raw -> ll header | |
144 | data -> ll header | |
145 | ||
146 | dev->hard_header == NULL (ll header is added by device, we cannot control it) | |
147 | mac.raw -> data | |
148 | data -> data | |
149 | ||
150 | We should set nh.raw on output to correct posistion, | |
151 | packet classifier depends on it. | |
152 | */ | |
153 | ||
154 | /* List of all packet sockets. */ | |
155 | static HLIST_HEAD(packet_sklist); | |
156 | static DEFINE_RWLOCK(packet_sklist_lock); | |
157 | ||
158 | static atomic_t packet_socks_nr; | |
159 | ||
160 | ||
161 | /* Private packet socket structures. */ | |
162 | ||
163 | #ifdef CONFIG_PACKET_MULTICAST | |
164 | struct packet_mclist | |
165 | { | |
166 | struct packet_mclist *next; | |
167 | int ifindex; | |
168 | int count; | |
169 | unsigned short type; | |
170 | unsigned short alen; | |
0fb375fb EB |
171 | unsigned char addr[MAX_ADDR_LEN]; |
172 | }; | |
173 | /* identical to struct packet_mreq except it has | |
174 | * a longer address field. | |
175 | */ | |
176 | struct packet_mreq_max | |
177 | { | |
178 | int mr_ifindex; | |
179 | unsigned short mr_type; | |
180 | unsigned short mr_alen; | |
181 | unsigned char mr_address[MAX_ADDR_LEN]; | |
1da177e4 LT |
182 | }; |
183 | #endif | |
184 | #ifdef CONFIG_PACKET_MMAP | |
185 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing); | |
186 | #endif | |
187 | ||
188 | static void packet_flush_mclist(struct sock *sk); | |
189 | ||
190 | struct packet_sock { | |
191 | /* struct sock has to be the first member of packet_sock */ | |
192 | struct sock sk; | |
193 | struct tpacket_stats stats; | |
194 | #ifdef CONFIG_PACKET_MMAP | |
195 | char * *pg_vec; | |
196 | unsigned int head; | |
197 | unsigned int frames_per_block; | |
198 | unsigned int frame_size; | |
199 | unsigned int frame_max; | |
200 | int copy_thresh; | |
201 | #endif | |
202 | struct packet_type prot_hook; | |
203 | spinlock_t bind_lock; | |
8dc41944 HX |
204 | unsigned int running:1, /* prot_hook is attached*/ |
205 | auxdata:1; | |
1da177e4 | 206 | int ifindex; /* bound device */ |
0e11c91e | 207 | __be16 num; |
1da177e4 LT |
208 | #ifdef CONFIG_PACKET_MULTICAST |
209 | struct packet_mclist *mclist; | |
210 | #endif | |
211 | #ifdef CONFIG_PACKET_MMAP | |
212 | atomic_t mapped; | |
213 | unsigned int pg_vec_order; | |
214 | unsigned int pg_vec_pages; | |
215 | unsigned int pg_vec_len; | |
216 | #endif | |
217 | }; | |
218 | ||
ffbc6111 HX |
219 | struct packet_skb_cb { |
220 | unsigned int origlen; | |
221 | union { | |
222 | struct sockaddr_pkt pkt; | |
223 | struct sockaddr_ll ll; | |
224 | } sa; | |
225 | }; | |
226 | ||
227 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) | |
8dc41944 | 228 | |
1da177e4 LT |
229 | #ifdef CONFIG_PACKET_MMAP |
230 | ||
231 | static inline char *packet_lookup_frame(struct packet_sock *po, unsigned int position) | |
232 | { | |
233 | unsigned int pg_vec_pos, frame_offset; | |
234 | char *frame; | |
235 | ||
236 | pg_vec_pos = position / po->frames_per_block; | |
237 | frame_offset = position % po->frames_per_block; | |
238 | ||
239 | frame = po->pg_vec[pg_vec_pos] + (frame_offset * po->frame_size); | |
240 | ||
241 | return frame; | |
242 | } | |
243 | #endif | |
244 | ||
245 | static inline struct packet_sock *pkt_sk(struct sock *sk) | |
246 | { | |
247 | return (struct packet_sock *)sk; | |
248 | } | |
249 | ||
250 | static void packet_sock_destruct(struct sock *sk) | |
251 | { | |
252 | BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); | |
253 | BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); | |
254 | ||
255 | if (!sock_flag(sk, SOCK_DEAD)) { | |
256 | printk("Attempt to release alive packet socket: %p\n", sk); | |
257 | return; | |
258 | } | |
259 | ||
260 | atomic_dec(&packet_socks_nr); | |
261 | #ifdef PACKET_REFCNT_DEBUG | |
262 | printk(KERN_DEBUG "PACKET socket %p is free, %d are alive\n", sk, atomic_read(&packet_socks_nr)); | |
263 | #endif | |
264 | } | |
265 | ||
266 | ||
90ddc4f0 | 267 | static const struct proto_ops packet_ops; |
1da177e4 LT |
268 | |
269 | #ifdef CONFIG_SOCK_PACKET | |
90ddc4f0 | 270 | static const struct proto_ops packet_ops_spkt; |
1da177e4 | 271 | |
f2ccd8fa | 272 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
273 | { |
274 | struct sock *sk; | |
275 | struct sockaddr_pkt *spkt; | |
276 | ||
277 | /* | |
278 | * When we registered the protocol we saved the socket in the data | |
279 | * field for just this event. | |
280 | */ | |
281 | ||
282 | sk = pt->af_packet_priv; | |
283 | ||
284 | /* | |
285 | * Yank back the headers [hope the device set this | |
286 | * right or kerboom...] | |
287 | * | |
288 | * Incoming packets have ll header pulled, | |
289 | * push it back. | |
290 | * | |
291 | * For outgoing ones skb->data == skb->mac.raw | |
292 | * so that this procedure is noop. | |
293 | */ | |
294 | ||
295 | if (skb->pkt_type == PACKET_LOOPBACK) | |
296 | goto out; | |
297 | ||
298 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
299 | goto oom; | |
300 | ||
301 | /* drop any routing info */ | |
302 | dst_release(skb->dst); | |
303 | skb->dst = NULL; | |
304 | ||
84531c24 PO |
305 | /* drop conntrack reference */ |
306 | nf_reset(skb); | |
307 | ||
ffbc6111 | 308 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
1da177e4 LT |
309 | |
310 | skb_push(skb, skb->data-skb->mac.raw); | |
311 | ||
312 | /* | |
313 | * The SOCK_PACKET socket receives _all_ frames. | |
314 | */ | |
315 | ||
316 | spkt->spkt_family = dev->type; | |
317 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
318 | spkt->spkt_protocol = skb->protocol; | |
319 | ||
320 | /* | |
321 | * Charge the memory to the socket. This is done specifically | |
322 | * to prevent sockets using all the memory up. | |
323 | */ | |
324 | ||
325 | if (sock_queue_rcv_skb(sk,skb) == 0) | |
326 | return 0; | |
327 | ||
328 | out: | |
329 | kfree_skb(skb); | |
330 | oom: | |
331 | return 0; | |
332 | } | |
333 | ||
334 | ||
335 | /* | |
336 | * Output a raw packet to a device layer. This bypasses all the other | |
337 | * protocol layers and you must therefore supply it with a complete frame | |
338 | */ | |
339 | ||
340 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, | |
341 | struct msghdr *msg, size_t len) | |
342 | { | |
343 | struct sock *sk = sock->sk; | |
344 | struct sockaddr_pkt *saddr=(struct sockaddr_pkt *)msg->msg_name; | |
345 | struct sk_buff *skb; | |
346 | struct net_device *dev; | |
0e11c91e | 347 | __be16 proto=0; |
1da177e4 LT |
348 | int err; |
349 | ||
350 | /* | |
351 | * Get and verify the address. | |
352 | */ | |
353 | ||
354 | if (saddr) | |
355 | { | |
356 | if (msg->msg_namelen < sizeof(struct sockaddr)) | |
357 | return(-EINVAL); | |
358 | if (msg->msg_namelen==sizeof(struct sockaddr_pkt)) | |
359 | proto=saddr->spkt_protocol; | |
360 | } | |
361 | else | |
362 | return(-ENOTCONN); /* SOCK_PACKET must be sent giving an address */ | |
363 | ||
364 | /* | |
365 | * Find the device first to size check it | |
366 | */ | |
367 | ||
368 | saddr->spkt_device[13] = 0; | |
369 | dev = dev_get_by_name(saddr->spkt_device); | |
370 | err = -ENODEV; | |
371 | if (dev == NULL) | |
372 | goto out_unlock; | |
373 | ||
d5e76b0a DM |
374 | err = -ENETDOWN; |
375 | if (!(dev->flags & IFF_UP)) | |
376 | goto out_unlock; | |
377 | ||
1da177e4 LT |
378 | /* |
379 | * You may not queue a frame bigger than the mtu. This is the lowest level | |
380 | * raw protocol and you must do your own fragmentation at this level. | |
381 | */ | |
382 | ||
383 | err = -EMSGSIZE; | |
8ae55f04 | 384 | if (len > dev->mtu + dev->hard_header_len) |
1da177e4 LT |
385 | goto out_unlock; |
386 | ||
387 | err = -ENOBUFS; | |
388 | skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL); | |
389 | ||
390 | /* | |
391 | * If the write buffer is full, then tough. At this level the user gets to | |
392 | * deal with the problem - do your own algorithmic backoffs. That's far | |
393 | * more flexible. | |
394 | */ | |
395 | ||
396 | if (skb == NULL) | |
397 | goto out_unlock; | |
398 | ||
399 | /* | |
400 | * Fill it in | |
401 | */ | |
402 | ||
403 | /* FIXME: Save some space for broken drivers that write a | |
404 | * hard header at transmission time by themselves. PPP is the | |
405 | * notable one here. This should really be fixed at the driver level. | |
406 | */ | |
407 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
408 | skb->nh.raw = skb->data; | |
409 | ||
410 | /* Try to align data part correctly */ | |
411 | if (dev->hard_header) { | |
412 | skb->data -= dev->hard_header_len; | |
413 | skb->tail -= dev->hard_header_len; | |
414 | if (len < dev->hard_header_len) | |
415 | skb->nh.raw = skb->data; | |
416 | } | |
417 | ||
418 | /* Returns -EFAULT on error */ | |
419 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); | |
420 | skb->protocol = proto; | |
421 | skb->dev = dev; | |
422 | skb->priority = sk->sk_priority; | |
423 | if (err) | |
424 | goto out_free; | |
425 | ||
1da177e4 LT |
426 | /* |
427 | * Now send it | |
428 | */ | |
429 | ||
430 | dev_queue_xmit(skb); | |
431 | dev_put(dev); | |
432 | return(len); | |
433 | ||
434 | out_free: | |
435 | kfree_skb(skb); | |
436 | out_unlock: | |
437 | if (dev) | |
438 | dev_put(dev); | |
439 | return err; | |
440 | } | |
441 | #endif | |
442 | ||
dbcb5855 DM |
443 | static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk, |
444 | unsigned int res) | |
1da177e4 LT |
445 | { |
446 | struct sk_filter *filter; | |
fda9ef5d DM |
447 | |
448 | rcu_read_lock_bh(); | |
449 | filter = rcu_dereference(sk->sk_filter); | |
dbcb5855 DM |
450 | if (filter != NULL) |
451 | res = sk_run_filter(skb, filter->insns, filter->len); | |
fda9ef5d | 452 | rcu_read_unlock_bh(); |
1da177e4 | 453 | |
dbcb5855 | 454 | return res; |
1da177e4 LT |
455 | } |
456 | ||
457 | /* | |
458 | This function makes lazy skb cloning in hope that most of packets | |
459 | are discarded by BPF. | |
460 | ||
461 | Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
462 | and skb->cb are mangled. It works because (and until) packets | |
463 | falling here are owned by current CPU. Output packets are cloned | |
464 | by dev_queue_xmit_nit(), input packets are processed by net_bh | |
465 | sequencially, so that if we return skb to original state on exit, | |
466 | we will not harm anyone. | |
467 | */ | |
468 | ||
f2ccd8fa | 469 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
470 | { |
471 | struct sock *sk; | |
472 | struct sockaddr_ll *sll; | |
473 | struct packet_sock *po; | |
474 | u8 * skb_head = skb->data; | |
475 | int skb_len = skb->len; | |
dbcb5855 | 476 | unsigned int snaplen, res; |
1da177e4 LT |
477 | |
478 | if (skb->pkt_type == PACKET_LOOPBACK) | |
479 | goto drop; | |
480 | ||
481 | sk = pt->af_packet_priv; | |
482 | po = pkt_sk(sk); | |
483 | ||
484 | skb->dev = dev; | |
485 | ||
486 | if (dev->hard_header) { | |
487 | /* The device has an explicit notion of ll header, | |
488 | exported to higher levels. | |
489 | ||
490 | Otherwise, the device hides datails of it frame | |
491 | structure, so that corresponding packet head | |
492 | never delivered to user. | |
493 | */ | |
494 | if (sk->sk_type != SOCK_DGRAM) | |
495 | skb_push(skb, skb->data - skb->mac.raw); | |
496 | else if (skb->pkt_type == PACKET_OUTGOING) { | |
497 | /* Special case: outgoing packets have ll header at head */ | |
498 | skb_pull(skb, skb->nh.raw - skb->data); | |
499 | } | |
500 | } | |
501 | ||
502 | snaplen = skb->len; | |
503 | ||
dbcb5855 DM |
504 | res = run_filter(skb, sk, snaplen); |
505 | if (!res) | |
fda9ef5d | 506 | goto drop_n_restore; |
dbcb5855 DM |
507 | if (snaplen > res) |
508 | snaplen = res; | |
1da177e4 LT |
509 | |
510 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
511 | (unsigned)sk->sk_rcvbuf) | |
512 | goto drop_n_acct; | |
513 | ||
514 | if (skb_shared(skb)) { | |
515 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
516 | if (nskb == NULL) | |
517 | goto drop_n_acct; | |
518 | ||
519 | if (skb_head != skb->data) { | |
520 | skb->data = skb_head; | |
521 | skb->len = skb_len; | |
522 | } | |
523 | kfree_skb(skb); | |
524 | skb = nskb; | |
525 | } | |
526 | ||
ffbc6111 HX |
527 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
528 | sizeof(skb->cb)); | |
529 | ||
530 | sll = &PACKET_SKB_CB(skb)->sa.ll; | |
1da177e4 LT |
531 | sll->sll_family = AF_PACKET; |
532 | sll->sll_hatype = dev->type; | |
533 | sll->sll_protocol = skb->protocol; | |
534 | sll->sll_pkttype = skb->pkt_type; | |
535 | sll->sll_ifindex = dev->ifindex; | |
536 | sll->sll_halen = 0; | |
537 | ||
538 | if (dev->hard_header_parse) | |
539 | sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); | |
540 | ||
ffbc6111 | 541 | PACKET_SKB_CB(skb)->origlen = skb->len; |
8dc41944 | 542 | |
1da177e4 LT |
543 | if (pskb_trim(skb, snaplen)) |
544 | goto drop_n_acct; | |
545 | ||
546 | skb_set_owner_r(skb, sk); | |
547 | skb->dev = NULL; | |
548 | dst_release(skb->dst); | |
549 | skb->dst = NULL; | |
550 | ||
84531c24 PO |
551 | /* drop conntrack reference */ |
552 | nf_reset(skb); | |
553 | ||
1da177e4 LT |
554 | spin_lock(&sk->sk_receive_queue.lock); |
555 | po->stats.tp_packets++; | |
556 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
557 | spin_unlock(&sk->sk_receive_queue.lock); | |
558 | sk->sk_data_ready(sk, skb->len); | |
559 | return 0; | |
560 | ||
561 | drop_n_acct: | |
562 | spin_lock(&sk->sk_receive_queue.lock); | |
563 | po->stats.tp_drops++; | |
564 | spin_unlock(&sk->sk_receive_queue.lock); | |
565 | ||
566 | drop_n_restore: | |
567 | if (skb_head != skb->data && skb_shared(skb)) { | |
568 | skb->data = skb_head; | |
569 | skb->len = skb_len; | |
570 | } | |
571 | drop: | |
572 | kfree_skb(skb); | |
573 | return 0; | |
574 | } | |
575 | ||
576 | #ifdef CONFIG_PACKET_MMAP | |
f2ccd8fa | 577 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
578 | { |
579 | struct sock *sk; | |
580 | struct packet_sock *po; | |
581 | struct sockaddr_ll *sll; | |
582 | struct tpacket_hdr *h; | |
583 | u8 * skb_head = skb->data; | |
584 | int skb_len = skb->len; | |
dbcb5855 | 585 | unsigned int snaplen, res; |
1da177e4 LT |
586 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
587 | unsigned short macoff, netoff; | |
588 | struct sk_buff *copy_skb = NULL; | |
589 | ||
590 | if (skb->pkt_type == PACKET_LOOPBACK) | |
591 | goto drop; | |
592 | ||
593 | sk = pt->af_packet_priv; | |
594 | po = pkt_sk(sk); | |
595 | ||
596 | if (dev->hard_header) { | |
597 | if (sk->sk_type != SOCK_DGRAM) | |
598 | skb_push(skb, skb->data - skb->mac.raw); | |
599 | else if (skb->pkt_type == PACKET_OUTGOING) { | |
600 | /* Special case: outgoing packets have ll header at head */ | |
601 | skb_pull(skb, skb->nh.raw - skb->data); | |
1da177e4 LT |
602 | } |
603 | } | |
604 | ||
8dc41944 HX |
605 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
606 | status |= TP_STATUS_CSUMNOTREADY; | |
607 | ||
1da177e4 LT |
608 | snaplen = skb->len; |
609 | ||
dbcb5855 DM |
610 | res = run_filter(skb, sk, snaplen); |
611 | if (!res) | |
fda9ef5d | 612 | goto drop_n_restore; |
dbcb5855 DM |
613 | if (snaplen > res) |
614 | snaplen = res; | |
1da177e4 LT |
615 | |
616 | if (sk->sk_type == SOCK_DGRAM) { | |
617 | macoff = netoff = TPACKET_ALIGN(TPACKET_HDRLEN) + 16; | |
618 | } else { | |
619 | unsigned maclen = skb->nh.raw - skb->data; | |
620 | netoff = TPACKET_ALIGN(TPACKET_HDRLEN + (maclen < 16 ? 16 : maclen)); | |
621 | macoff = netoff - maclen; | |
622 | } | |
623 | ||
624 | if (macoff + snaplen > po->frame_size) { | |
625 | if (po->copy_thresh && | |
626 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < | |
627 | (unsigned)sk->sk_rcvbuf) { | |
628 | if (skb_shared(skb)) { | |
629 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
630 | } else { | |
631 | copy_skb = skb_get(skb); | |
632 | skb_head = skb->data; | |
633 | } | |
634 | if (copy_skb) | |
635 | skb_set_owner_r(copy_skb, sk); | |
636 | } | |
637 | snaplen = po->frame_size - macoff; | |
638 | if ((int)snaplen < 0) | |
639 | snaplen = 0; | |
640 | } | |
1da177e4 LT |
641 | |
642 | spin_lock(&sk->sk_receive_queue.lock); | |
643 | h = (struct tpacket_hdr *)packet_lookup_frame(po, po->head); | |
644 | ||
645 | if (h->tp_status) | |
646 | goto ring_is_full; | |
647 | po->head = po->head != po->frame_max ? po->head+1 : 0; | |
648 | po->stats.tp_packets++; | |
649 | if (copy_skb) { | |
650 | status |= TP_STATUS_COPY; | |
651 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
652 | } | |
653 | if (!po->stats.tp_drops) | |
654 | status &= ~TP_STATUS_LOSING; | |
655 | spin_unlock(&sk->sk_receive_queue.lock); | |
656 | ||
cbe21d8f | 657 | skb_copy_bits(skb, 0, (u8*)h + macoff, snaplen); |
1da177e4 LT |
658 | |
659 | h->tp_len = skb->len; | |
660 | h->tp_snaplen = snaplen; | |
661 | h->tp_mac = macoff; | |
662 | h->tp_net = netoff; | |
a61bbcf2 PM |
663 | if (skb->tstamp.off_sec == 0) { |
664 | __net_timestamp(skb); | |
1da177e4 LT |
665 | sock_enable_timestamp(sk); |
666 | } | |
325ed823 HX |
667 | h->tp_sec = skb->tstamp.off_sec; |
668 | h->tp_usec = skb->tstamp.off_usec; | |
1da177e4 LT |
669 | |
670 | sll = (struct sockaddr_ll*)((u8*)h + TPACKET_ALIGN(sizeof(*h))); | |
671 | sll->sll_halen = 0; | |
672 | if (dev->hard_header_parse) | |
673 | sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); | |
674 | sll->sll_family = AF_PACKET; | |
675 | sll->sll_hatype = dev->type; | |
676 | sll->sll_protocol = skb->protocol; | |
677 | sll->sll_pkttype = skb->pkt_type; | |
678 | sll->sll_ifindex = dev->ifindex; | |
679 | ||
680 | h->tp_status = status; | |
e16aa207 | 681 | smp_mb(); |
1da177e4 LT |
682 | |
683 | { | |
684 | struct page *p_start, *p_end; | |
685 | u8 *h_end = (u8 *)h + macoff + snaplen - 1; | |
686 | ||
687 | p_start = virt_to_page(h); | |
688 | p_end = virt_to_page(h_end); | |
689 | while (p_start <= p_end) { | |
690 | flush_dcache_page(p_start); | |
691 | p_start++; | |
692 | } | |
693 | } | |
694 | ||
695 | sk->sk_data_ready(sk, 0); | |
696 | ||
697 | drop_n_restore: | |
698 | if (skb_head != skb->data && skb_shared(skb)) { | |
699 | skb->data = skb_head; | |
700 | skb->len = skb_len; | |
701 | } | |
702 | drop: | |
703 | kfree_skb(skb); | |
704 | return 0; | |
705 | ||
706 | ring_is_full: | |
707 | po->stats.tp_drops++; | |
708 | spin_unlock(&sk->sk_receive_queue.lock); | |
709 | ||
710 | sk->sk_data_ready(sk, 0); | |
711 | if (copy_skb) | |
712 | kfree_skb(copy_skb); | |
713 | goto drop_n_restore; | |
714 | } | |
715 | ||
716 | #endif | |
717 | ||
718 | ||
719 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, | |
720 | struct msghdr *msg, size_t len) | |
721 | { | |
722 | struct sock *sk = sock->sk; | |
723 | struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name; | |
724 | struct sk_buff *skb; | |
725 | struct net_device *dev; | |
0e11c91e | 726 | __be16 proto; |
1da177e4 LT |
727 | unsigned char *addr; |
728 | int ifindex, err, reserve = 0; | |
729 | ||
730 | /* | |
731 | * Get and verify the address. | |
732 | */ | |
733 | ||
734 | if (saddr == NULL) { | |
735 | struct packet_sock *po = pkt_sk(sk); | |
736 | ||
737 | ifindex = po->ifindex; | |
738 | proto = po->num; | |
739 | addr = NULL; | |
740 | } else { | |
741 | err = -EINVAL; | |
742 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
743 | goto out; | |
0fb375fb EB |
744 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
745 | goto out; | |
1da177e4 LT |
746 | ifindex = saddr->sll_ifindex; |
747 | proto = saddr->sll_protocol; | |
748 | addr = saddr->sll_addr; | |
749 | } | |
750 | ||
751 | ||
752 | dev = dev_get_by_index(ifindex); | |
753 | err = -ENXIO; | |
754 | if (dev == NULL) | |
755 | goto out_unlock; | |
756 | if (sock->type == SOCK_RAW) | |
757 | reserve = dev->hard_header_len; | |
758 | ||
d5e76b0a DM |
759 | err = -ENETDOWN; |
760 | if (!(dev->flags & IFF_UP)) | |
761 | goto out_unlock; | |
762 | ||
1da177e4 LT |
763 | err = -EMSGSIZE; |
764 | if (len > dev->mtu+reserve) | |
765 | goto out_unlock; | |
766 | ||
767 | skb = sock_alloc_send_skb(sk, len + LL_RESERVED_SPACE(dev), | |
768 | msg->msg_flags & MSG_DONTWAIT, &err); | |
769 | if (skb==NULL) | |
770 | goto out_unlock; | |
771 | ||
772 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
773 | skb->nh.raw = skb->data; | |
774 | ||
775 | if (dev->hard_header) { | |
776 | int res; | |
777 | err = -EINVAL; | |
778 | res = dev->hard_header(skb, dev, ntohs(proto), addr, NULL, len); | |
779 | if (sock->type != SOCK_DGRAM) { | |
780 | skb->tail = skb->data; | |
781 | skb->len = 0; | |
782 | } else if (res < 0) | |
783 | goto out_free; | |
784 | } | |
785 | ||
786 | /* Returns -EFAULT on error */ | |
787 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); | |
788 | if (err) | |
789 | goto out_free; | |
790 | ||
791 | skb->protocol = proto; | |
792 | skb->dev = dev; | |
793 | skb->priority = sk->sk_priority; | |
794 | ||
1da177e4 LT |
795 | /* |
796 | * Now send it | |
797 | */ | |
798 | ||
799 | err = dev_queue_xmit(skb); | |
800 | if (err > 0 && (err = net_xmit_errno(err)) != 0) | |
801 | goto out_unlock; | |
802 | ||
803 | dev_put(dev); | |
804 | ||
805 | return(len); | |
806 | ||
807 | out_free: | |
808 | kfree_skb(skb); | |
809 | out_unlock: | |
810 | if (dev) | |
811 | dev_put(dev); | |
812 | out: | |
813 | return err; | |
814 | } | |
815 | ||
816 | /* | |
817 | * Close a PACKET socket. This is fairly simple. We immediately go | |
818 | * to 'closed' state and remove our protocol entry in the device list. | |
819 | */ | |
820 | ||
821 | static int packet_release(struct socket *sock) | |
822 | { | |
823 | struct sock *sk = sock->sk; | |
824 | struct packet_sock *po; | |
825 | ||
826 | if (!sk) | |
827 | return 0; | |
828 | ||
829 | po = pkt_sk(sk); | |
830 | ||
831 | write_lock_bh(&packet_sklist_lock); | |
832 | sk_del_node_init(sk); | |
833 | write_unlock_bh(&packet_sklist_lock); | |
834 | ||
835 | /* | |
836 | * Unhook packet receive handler. | |
837 | */ | |
838 | ||
839 | if (po->running) { | |
840 | /* | |
841 | * Remove the protocol hook | |
842 | */ | |
843 | dev_remove_pack(&po->prot_hook); | |
844 | po->running = 0; | |
845 | po->num = 0; | |
846 | __sock_put(sk); | |
847 | } | |
848 | ||
849 | #ifdef CONFIG_PACKET_MULTICAST | |
850 | packet_flush_mclist(sk); | |
851 | #endif | |
852 | ||
853 | #ifdef CONFIG_PACKET_MMAP | |
854 | if (po->pg_vec) { | |
855 | struct tpacket_req req; | |
856 | memset(&req, 0, sizeof(req)); | |
857 | packet_set_ring(sk, &req, 1); | |
858 | } | |
859 | #endif | |
860 | ||
861 | /* | |
862 | * Now the socket is dead. No more input will appear. | |
863 | */ | |
864 | ||
865 | sock_orphan(sk); | |
866 | sock->sk = NULL; | |
867 | ||
868 | /* Purge queues */ | |
869 | ||
870 | skb_queue_purge(&sk->sk_receive_queue); | |
871 | ||
872 | sock_put(sk); | |
873 | return 0; | |
874 | } | |
875 | ||
876 | /* | |
877 | * Attach a packet hook. | |
878 | */ | |
879 | ||
0e11c91e | 880 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
1da177e4 LT |
881 | { |
882 | struct packet_sock *po = pkt_sk(sk); | |
883 | /* | |
884 | * Detach an existing hook if present. | |
885 | */ | |
886 | ||
887 | lock_sock(sk); | |
888 | ||
889 | spin_lock(&po->bind_lock); | |
890 | if (po->running) { | |
891 | __sock_put(sk); | |
892 | po->running = 0; | |
893 | po->num = 0; | |
894 | spin_unlock(&po->bind_lock); | |
895 | dev_remove_pack(&po->prot_hook); | |
896 | spin_lock(&po->bind_lock); | |
897 | } | |
898 | ||
899 | po->num = protocol; | |
900 | po->prot_hook.type = protocol; | |
901 | po->prot_hook.dev = dev; | |
902 | ||
903 | po->ifindex = dev ? dev->ifindex : 0; | |
904 | ||
905 | if (protocol == 0) | |
906 | goto out_unlock; | |
907 | ||
908 | if (dev) { | |
909 | if (dev->flags&IFF_UP) { | |
910 | dev_add_pack(&po->prot_hook); | |
911 | sock_hold(sk); | |
912 | po->running = 1; | |
913 | } else { | |
914 | sk->sk_err = ENETDOWN; | |
915 | if (!sock_flag(sk, SOCK_DEAD)) | |
916 | sk->sk_error_report(sk); | |
917 | } | |
918 | } else { | |
919 | dev_add_pack(&po->prot_hook); | |
920 | sock_hold(sk); | |
921 | po->running = 1; | |
922 | } | |
923 | ||
924 | out_unlock: | |
925 | spin_unlock(&po->bind_lock); | |
926 | release_sock(sk); | |
927 | return 0; | |
928 | } | |
929 | ||
930 | /* | |
931 | * Bind a packet socket to a device | |
932 | */ | |
933 | ||
934 | #ifdef CONFIG_SOCK_PACKET | |
935 | ||
936 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
937 | { | |
938 | struct sock *sk=sock->sk; | |
939 | char name[15]; | |
940 | struct net_device *dev; | |
941 | int err = -ENODEV; | |
942 | ||
943 | /* | |
944 | * Check legality | |
945 | */ | |
946 | ||
8ae55f04 | 947 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 LT |
948 | return -EINVAL; |
949 | strlcpy(name,uaddr->sa_data,sizeof(name)); | |
950 | ||
951 | dev = dev_get_by_name(name); | |
952 | if (dev) { | |
953 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); | |
954 | dev_put(dev); | |
955 | } | |
956 | return err; | |
957 | } | |
958 | #endif | |
959 | ||
960 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
961 | { | |
962 | struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; | |
963 | struct sock *sk=sock->sk; | |
964 | struct net_device *dev = NULL; | |
965 | int err; | |
966 | ||
967 | ||
968 | /* | |
969 | * Check legality | |
970 | */ | |
971 | ||
972 | if (addr_len < sizeof(struct sockaddr_ll)) | |
973 | return -EINVAL; | |
974 | if (sll->sll_family != AF_PACKET) | |
975 | return -EINVAL; | |
976 | ||
977 | if (sll->sll_ifindex) { | |
978 | err = -ENODEV; | |
979 | dev = dev_get_by_index(sll->sll_ifindex); | |
980 | if (dev == NULL) | |
981 | goto out; | |
982 | } | |
983 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
984 | if (dev) | |
985 | dev_put(dev); | |
986 | ||
987 | out: | |
988 | return err; | |
989 | } | |
990 | ||
991 | static struct proto packet_proto = { | |
992 | .name = "PACKET", | |
993 | .owner = THIS_MODULE, | |
994 | .obj_size = sizeof(struct packet_sock), | |
995 | }; | |
996 | ||
997 | /* | |
998 | * Create a packet of type SOCK_PACKET. | |
999 | */ | |
1000 | ||
1001 | static int packet_create(struct socket *sock, int protocol) | |
1002 | { | |
1003 | struct sock *sk; | |
1004 | struct packet_sock *po; | |
0e11c91e | 1005 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1da177e4 LT |
1006 | int err; |
1007 | ||
1008 | if (!capable(CAP_NET_RAW)) | |
1009 | return -EPERM; | |
1010 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW | |
1011 | #ifdef CONFIG_SOCK_PACKET | |
1012 | && sock->type != SOCK_PACKET | |
1013 | #endif | |
1014 | ) | |
1015 | return -ESOCKTNOSUPPORT; | |
1016 | ||
1017 | sock->state = SS_UNCONNECTED; | |
1018 | ||
1019 | err = -ENOBUFS; | |
1020 | sk = sk_alloc(PF_PACKET, GFP_KERNEL, &packet_proto, 1); | |
1021 | if (sk == NULL) | |
1022 | goto out; | |
1023 | ||
1024 | sock->ops = &packet_ops; | |
1025 | #ifdef CONFIG_SOCK_PACKET | |
1026 | if (sock->type == SOCK_PACKET) | |
1027 | sock->ops = &packet_ops_spkt; | |
1028 | #endif | |
1029 | sock_init_data(sock, sk); | |
1030 | ||
1031 | po = pkt_sk(sk); | |
1032 | sk->sk_family = PF_PACKET; | |
0e11c91e | 1033 | po->num = proto; |
1da177e4 LT |
1034 | |
1035 | sk->sk_destruct = packet_sock_destruct; | |
1036 | atomic_inc(&packet_socks_nr); | |
1037 | ||
1038 | /* | |
1039 | * Attach a protocol block | |
1040 | */ | |
1041 | ||
1042 | spin_lock_init(&po->bind_lock); | |
1043 | po->prot_hook.func = packet_rcv; | |
1044 | #ifdef CONFIG_SOCK_PACKET | |
1045 | if (sock->type == SOCK_PACKET) | |
1046 | po->prot_hook.func = packet_rcv_spkt; | |
1047 | #endif | |
1048 | po->prot_hook.af_packet_priv = sk; | |
1049 | ||
0e11c91e AV |
1050 | if (proto) { |
1051 | po->prot_hook.type = proto; | |
1da177e4 LT |
1052 | dev_add_pack(&po->prot_hook); |
1053 | sock_hold(sk); | |
1054 | po->running = 1; | |
1055 | } | |
1056 | ||
1057 | write_lock_bh(&packet_sklist_lock); | |
1058 | sk_add_node(sk, &packet_sklist); | |
1059 | write_unlock_bh(&packet_sklist_lock); | |
1060 | return(0); | |
1061 | out: | |
1062 | return err; | |
1063 | } | |
1064 | ||
1065 | /* | |
1066 | * Pull a packet from our receive queue and hand it to the user. | |
1067 | * If necessary we block. | |
1068 | */ | |
1069 | ||
1070 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1071 | struct msghdr *msg, size_t len, int flags) | |
1072 | { | |
1073 | struct sock *sk = sock->sk; | |
1074 | struct sk_buff *skb; | |
1075 | int copied, err; | |
0fb375fb | 1076 | struct sockaddr_ll *sll; |
1da177e4 LT |
1077 | |
1078 | err = -EINVAL; | |
1079 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) | |
1080 | goto out; | |
1081 | ||
1082 | #if 0 | |
1083 | /* What error should we return now? EUNATTACH? */ | |
1084 | if (pkt_sk(sk)->ifindex < 0) | |
1085 | return -ENODEV; | |
1086 | #endif | |
1087 | ||
1da177e4 LT |
1088 | /* |
1089 | * Call the generic datagram receiver. This handles all sorts | |
1090 | * of horrible races and re-entrancy so we can forget about it | |
1091 | * in the protocol layers. | |
1092 | * | |
1093 | * Now it will return ENETDOWN, if device have just gone down, | |
1094 | * but then it will block. | |
1095 | */ | |
1096 | ||
1097 | skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&err); | |
1098 | ||
1099 | /* | |
1100 | * An error occurred so return it. Because skb_recv_datagram() | |
1101 | * handles the blocking we don't see and worry about blocking | |
1102 | * retries. | |
1103 | */ | |
1104 | ||
8ae55f04 | 1105 | if (skb == NULL) |
1da177e4 LT |
1106 | goto out; |
1107 | ||
0fb375fb EB |
1108 | /* |
1109 | * If the address length field is there to be filled in, we fill | |
1110 | * it in now. | |
1111 | */ | |
1112 | ||
ffbc6111 | 1113 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
0fb375fb EB |
1114 | if (sock->type == SOCK_PACKET) |
1115 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
1116 | else | |
1117 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); | |
1118 | ||
1da177e4 LT |
1119 | /* |
1120 | * You lose any data beyond the buffer you gave. If it worries a | |
1121 | * user program they can ask the device for its MTU anyway. | |
1122 | */ | |
1123 | ||
1124 | copied = skb->len; | |
1125 | if (copied > len) | |
1126 | { | |
1127 | copied=len; | |
1128 | msg->msg_flags|=MSG_TRUNC; | |
1129 | } | |
1130 | ||
1131 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1132 | if (err) | |
1133 | goto out_free; | |
1134 | ||
1135 | sock_recv_timestamp(msg, sk, skb); | |
1136 | ||
1137 | if (msg->msg_name) | |
ffbc6111 HX |
1138 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
1139 | msg->msg_namelen); | |
1da177e4 | 1140 | |
8dc41944 | 1141 | if (pkt_sk(sk)->auxdata) { |
ffbc6111 HX |
1142 | struct tpacket_auxdata aux; |
1143 | ||
1144 | aux.tp_status = TP_STATUS_USER; | |
1145 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
1146 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; | |
1147 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; | |
1148 | aux.tp_snaplen = skb->len; | |
1149 | aux.tp_mac = 0; | |
1150 | aux.tp_net = skb->nh.raw - skb->data; | |
1151 | ||
1152 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); | |
8dc41944 HX |
1153 | } |
1154 | ||
1da177e4 LT |
1155 | /* |
1156 | * Free or return the buffer as appropriate. Again this | |
1157 | * hides all the races and re-entrancy issues from us. | |
1158 | */ | |
1159 | err = (flags&MSG_TRUNC) ? skb->len : copied; | |
1160 | ||
1161 | out_free: | |
1162 | skb_free_datagram(sk, skb); | |
1163 | out: | |
1164 | return err; | |
1165 | } | |
1166 | ||
1167 | #ifdef CONFIG_SOCK_PACKET | |
1168 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, | |
1169 | int *uaddr_len, int peer) | |
1170 | { | |
1171 | struct net_device *dev; | |
1172 | struct sock *sk = sock->sk; | |
1173 | ||
1174 | if (peer) | |
1175 | return -EOPNOTSUPP; | |
1176 | ||
1177 | uaddr->sa_family = AF_PACKET; | |
1178 | dev = dev_get_by_index(pkt_sk(sk)->ifindex); | |
1179 | if (dev) { | |
1180 | strlcpy(uaddr->sa_data, dev->name, 15); | |
1181 | dev_put(dev); | |
1182 | } else | |
1183 | memset(uaddr->sa_data, 0, 14); | |
1184 | *uaddr_len = sizeof(*uaddr); | |
1185 | ||
1186 | return 0; | |
1187 | } | |
1188 | #endif | |
1189 | ||
1190 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
1191 | int *uaddr_len, int peer) | |
1192 | { | |
1193 | struct net_device *dev; | |
1194 | struct sock *sk = sock->sk; | |
1195 | struct packet_sock *po = pkt_sk(sk); | |
1196 | struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; | |
1197 | ||
1198 | if (peer) | |
1199 | return -EOPNOTSUPP; | |
1200 | ||
1201 | sll->sll_family = AF_PACKET; | |
1202 | sll->sll_ifindex = po->ifindex; | |
1203 | sll->sll_protocol = po->num; | |
1204 | dev = dev_get_by_index(po->ifindex); | |
1205 | if (dev) { | |
1206 | sll->sll_hatype = dev->type; | |
1207 | sll->sll_halen = dev->addr_len; | |
1208 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1209 | dev_put(dev); | |
1210 | } else { | |
1211 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
1212 | sll->sll_halen = 0; | |
1213 | } | |
0fb375fb | 1214 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
1215 | |
1216 | return 0; | |
1217 | } | |
1218 | ||
1219 | #ifdef CONFIG_PACKET_MULTICAST | |
1220 | static void packet_dev_mc(struct net_device *dev, struct packet_mclist *i, int what) | |
1221 | { | |
1222 | switch (i->type) { | |
1223 | case PACKET_MR_MULTICAST: | |
1224 | if (what > 0) | |
1225 | dev_mc_add(dev, i->addr, i->alen, 0); | |
1226 | else | |
1227 | dev_mc_delete(dev, i->addr, i->alen, 0); | |
1228 | break; | |
1229 | case PACKET_MR_PROMISC: | |
1230 | dev_set_promiscuity(dev, what); | |
1231 | break; | |
1232 | case PACKET_MR_ALLMULTI: | |
1233 | dev_set_allmulti(dev, what); | |
1234 | break; | |
1235 | default:; | |
1236 | } | |
1237 | } | |
1238 | ||
1239 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
1240 | { | |
1241 | for ( ; i; i=i->next) { | |
1242 | if (i->ifindex == dev->ifindex) | |
1243 | packet_dev_mc(dev, i, what); | |
1244 | } | |
1245 | } | |
1246 | ||
0fb375fb | 1247 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1248 | { |
1249 | struct packet_sock *po = pkt_sk(sk); | |
1250 | struct packet_mclist *ml, *i; | |
1251 | struct net_device *dev; | |
1252 | int err; | |
1253 | ||
1254 | rtnl_lock(); | |
1255 | ||
1256 | err = -ENODEV; | |
1257 | dev = __dev_get_by_index(mreq->mr_ifindex); | |
1258 | if (!dev) | |
1259 | goto done; | |
1260 | ||
1261 | err = -EINVAL; | |
1262 | if (mreq->mr_alen > dev->addr_len) | |
1263 | goto done; | |
1264 | ||
1265 | err = -ENOBUFS; | |
8b3a7005 | 1266 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
1267 | if (i == NULL) |
1268 | goto done; | |
1269 | ||
1270 | err = 0; | |
1271 | for (ml = po->mclist; ml; ml = ml->next) { | |
1272 | if (ml->ifindex == mreq->mr_ifindex && | |
1273 | ml->type == mreq->mr_type && | |
1274 | ml->alen == mreq->mr_alen && | |
1275 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1276 | ml->count++; | |
1277 | /* Free the new element ... */ | |
1278 | kfree(i); | |
1279 | goto done; | |
1280 | } | |
1281 | } | |
1282 | ||
1283 | i->type = mreq->mr_type; | |
1284 | i->ifindex = mreq->mr_ifindex; | |
1285 | i->alen = mreq->mr_alen; | |
1286 | memcpy(i->addr, mreq->mr_address, i->alen); | |
1287 | i->count = 1; | |
1288 | i->next = po->mclist; | |
1289 | po->mclist = i; | |
1290 | packet_dev_mc(dev, i, +1); | |
1291 | ||
1292 | done: | |
1293 | rtnl_unlock(); | |
1294 | return err; | |
1295 | } | |
1296 | ||
0fb375fb | 1297 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1298 | { |
1299 | struct packet_mclist *ml, **mlp; | |
1300 | ||
1301 | rtnl_lock(); | |
1302 | ||
1303 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
1304 | if (ml->ifindex == mreq->mr_ifindex && | |
1305 | ml->type == mreq->mr_type && | |
1306 | ml->alen == mreq->mr_alen && | |
1307 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1308 | if (--ml->count == 0) { | |
1309 | struct net_device *dev; | |
1310 | *mlp = ml->next; | |
1311 | dev = dev_get_by_index(ml->ifindex); | |
1312 | if (dev) { | |
1313 | packet_dev_mc(dev, ml, -1); | |
1314 | dev_put(dev); | |
1315 | } | |
1316 | kfree(ml); | |
1317 | } | |
1318 | rtnl_unlock(); | |
1319 | return 0; | |
1320 | } | |
1321 | } | |
1322 | rtnl_unlock(); | |
1323 | return -EADDRNOTAVAIL; | |
1324 | } | |
1325 | ||
1326 | static void packet_flush_mclist(struct sock *sk) | |
1327 | { | |
1328 | struct packet_sock *po = pkt_sk(sk); | |
1329 | struct packet_mclist *ml; | |
1330 | ||
1331 | if (!po->mclist) | |
1332 | return; | |
1333 | ||
1334 | rtnl_lock(); | |
1335 | while ((ml = po->mclist) != NULL) { | |
1336 | struct net_device *dev; | |
1337 | ||
1338 | po->mclist = ml->next; | |
1339 | if ((dev = dev_get_by_index(ml->ifindex)) != NULL) { | |
1340 | packet_dev_mc(dev, ml, -1); | |
1341 | dev_put(dev); | |
1342 | } | |
1343 | kfree(ml); | |
1344 | } | |
1345 | rtnl_unlock(); | |
1346 | } | |
1347 | #endif | |
1348 | ||
1349 | static int | |
1350 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) | |
1351 | { | |
1352 | struct sock *sk = sock->sk; | |
8dc41944 | 1353 | struct packet_sock *po = pkt_sk(sk); |
1da177e4 LT |
1354 | int ret; |
1355 | ||
1356 | if (level != SOL_PACKET) | |
1357 | return -ENOPROTOOPT; | |
1358 | ||
1359 | switch(optname) { | |
1360 | #ifdef CONFIG_PACKET_MULTICAST | |
1361 | case PACKET_ADD_MEMBERSHIP: | |
1362 | case PACKET_DROP_MEMBERSHIP: | |
1363 | { | |
0fb375fb EB |
1364 | struct packet_mreq_max mreq; |
1365 | int len = optlen; | |
1366 | memset(&mreq, 0, sizeof(mreq)); | |
1367 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 1368 | return -EINVAL; |
0fb375fb EB |
1369 | if (len > sizeof(mreq)) |
1370 | len = sizeof(mreq); | |
1371 | if (copy_from_user(&mreq,optval,len)) | |
1da177e4 | 1372 | return -EFAULT; |
0fb375fb EB |
1373 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
1374 | return -EINVAL; | |
1da177e4 LT |
1375 | if (optname == PACKET_ADD_MEMBERSHIP) |
1376 | ret = packet_mc_add(sk, &mreq); | |
1377 | else | |
1378 | ret = packet_mc_drop(sk, &mreq); | |
1379 | return ret; | |
1380 | } | |
1381 | #endif | |
1382 | #ifdef CONFIG_PACKET_MMAP | |
1383 | case PACKET_RX_RING: | |
1384 | { | |
1385 | struct tpacket_req req; | |
1386 | ||
1387 | if (optlen<sizeof(req)) | |
1388 | return -EINVAL; | |
1389 | if (copy_from_user(&req,optval,sizeof(req))) | |
1390 | return -EFAULT; | |
1391 | return packet_set_ring(sk, &req, 0); | |
1392 | } | |
1393 | case PACKET_COPY_THRESH: | |
1394 | { | |
1395 | int val; | |
1396 | ||
1397 | if (optlen!=sizeof(val)) | |
1398 | return -EINVAL; | |
1399 | if (copy_from_user(&val,optval,sizeof(val))) | |
1400 | return -EFAULT; | |
1401 | ||
1402 | pkt_sk(sk)->copy_thresh = val; | |
1403 | return 0; | |
1404 | } | |
1405 | #endif | |
8dc41944 HX |
1406 | case PACKET_AUXDATA: |
1407 | { | |
1408 | int val; | |
1409 | ||
1410 | if (optlen < sizeof(val)) | |
1411 | return -EINVAL; | |
1412 | if (copy_from_user(&val, optval, sizeof(val))) | |
1413 | return -EFAULT; | |
1414 | ||
1415 | po->auxdata = !!val; | |
1416 | return 0; | |
1417 | } | |
1da177e4 LT |
1418 | default: |
1419 | return -ENOPROTOOPT; | |
1420 | } | |
1421 | } | |
1422 | ||
1423 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
1424 | char __user *optval, int __user *optlen) | |
1425 | { | |
1426 | int len; | |
8dc41944 | 1427 | int val; |
1da177e4 LT |
1428 | struct sock *sk = sock->sk; |
1429 | struct packet_sock *po = pkt_sk(sk); | |
8dc41944 HX |
1430 | void *data; |
1431 | struct tpacket_stats st; | |
1da177e4 LT |
1432 | |
1433 | if (level != SOL_PACKET) | |
1434 | return -ENOPROTOOPT; | |
1435 | ||
8ae55f04 KK |
1436 | if (get_user(len, optlen)) |
1437 | return -EFAULT; | |
1da177e4 LT |
1438 | |
1439 | if (len < 0) | |
1440 | return -EINVAL; | |
1441 | ||
1442 | switch(optname) { | |
1443 | case PACKET_STATISTICS: | |
1da177e4 LT |
1444 | if (len > sizeof(struct tpacket_stats)) |
1445 | len = sizeof(struct tpacket_stats); | |
1446 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1447 | st = po->stats; | |
1448 | memset(&po->stats, 0, sizeof(st)); | |
1449 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1450 | st.tp_packets += st.tp_drops; | |
1451 | ||
8dc41944 HX |
1452 | data = &st; |
1453 | break; | |
1454 | case PACKET_AUXDATA: | |
1455 | if (len > sizeof(int)) | |
1456 | len = sizeof(int); | |
1457 | val = po->auxdata; | |
1458 | ||
1459 | data = &val; | |
1da177e4 | 1460 | break; |
1da177e4 LT |
1461 | default: |
1462 | return -ENOPROTOOPT; | |
1463 | } | |
1464 | ||
8ae55f04 KK |
1465 | if (put_user(len, optlen)) |
1466 | return -EFAULT; | |
8dc41944 HX |
1467 | if (copy_to_user(optval, data, len)) |
1468 | return -EFAULT; | |
8ae55f04 | 1469 | return 0; |
1da177e4 LT |
1470 | } |
1471 | ||
1472 | ||
1473 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) | |
1474 | { | |
1475 | struct sock *sk; | |
1476 | struct hlist_node *node; | |
1477 | struct net_device *dev = (struct net_device*)data; | |
1478 | ||
1479 | read_lock(&packet_sklist_lock); | |
1480 | sk_for_each(sk, node, &packet_sklist) { | |
1481 | struct packet_sock *po = pkt_sk(sk); | |
1482 | ||
1483 | switch (msg) { | |
1484 | case NETDEV_UNREGISTER: | |
1485 | #ifdef CONFIG_PACKET_MULTICAST | |
1486 | if (po->mclist) | |
1487 | packet_dev_mclist(dev, po->mclist, -1); | |
1488 | // fallthrough | |
1489 | #endif | |
1490 | case NETDEV_DOWN: | |
1491 | if (dev->ifindex == po->ifindex) { | |
1492 | spin_lock(&po->bind_lock); | |
1493 | if (po->running) { | |
1494 | __dev_remove_pack(&po->prot_hook); | |
1495 | __sock_put(sk); | |
1496 | po->running = 0; | |
1497 | sk->sk_err = ENETDOWN; | |
1498 | if (!sock_flag(sk, SOCK_DEAD)) | |
1499 | sk->sk_error_report(sk); | |
1500 | } | |
1501 | if (msg == NETDEV_UNREGISTER) { | |
1502 | po->ifindex = -1; | |
1503 | po->prot_hook.dev = NULL; | |
1504 | } | |
1505 | spin_unlock(&po->bind_lock); | |
1506 | } | |
1507 | break; | |
1508 | case NETDEV_UP: | |
1509 | spin_lock(&po->bind_lock); | |
1510 | if (dev->ifindex == po->ifindex && po->num && | |
1511 | !po->running) { | |
1512 | dev_add_pack(&po->prot_hook); | |
1513 | sock_hold(sk); | |
1514 | po->running = 1; | |
1515 | } | |
1516 | spin_unlock(&po->bind_lock); | |
1517 | break; | |
1518 | } | |
1519 | } | |
1520 | read_unlock(&packet_sklist_lock); | |
1521 | return NOTIFY_DONE; | |
1522 | } | |
1523 | ||
1524 | ||
1525 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
1526 | unsigned long arg) | |
1527 | { | |
1528 | struct sock *sk = sock->sk; | |
1529 | ||
1530 | switch(cmd) { | |
1531 | case SIOCOUTQ: | |
1532 | { | |
1533 | int amount = atomic_read(&sk->sk_wmem_alloc); | |
1534 | return put_user(amount, (int __user *)arg); | |
1535 | } | |
1536 | case SIOCINQ: | |
1537 | { | |
1538 | struct sk_buff *skb; | |
1539 | int amount = 0; | |
1540 | ||
1541 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1542 | skb = skb_peek(&sk->sk_receive_queue); | |
1543 | if (skb) | |
1544 | amount = skb->len; | |
1545 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1546 | return put_user(amount, (int __user *)arg); | |
1547 | } | |
1548 | case SIOCGSTAMP: | |
1549 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
1550 | ||
1551 | #ifdef CONFIG_INET | |
1552 | case SIOCADDRT: | |
1553 | case SIOCDELRT: | |
1554 | case SIOCDARP: | |
1555 | case SIOCGARP: | |
1556 | case SIOCSARP: | |
1557 | case SIOCGIFADDR: | |
1558 | case SIOCSIFADDR: | |
1559 | case SIOCGIFBRDADDR: | |
1560 | case SIOCSIFBRDADDR: | |
1561 | case SIOCGIFNETMASK: | |
1562 | case SIOCSIFNETMASK: | |
1563 | case SIOCGIFDSTADDR: | |
1564 | case SIOCSIFDSTADDR: | |
1565 | case SIOCSIFFLAGS: | |
1566 | return inet_dgram_ops.ioctl(sock, cmd, arg); | |
1567 | #endif | |
1568 | ||
1569 | default: | |
b5e5fa5e | 1570 | return -ENOIOCTLCMD; |
1da177e4 LT |
1571 | } |
1572 | return 0; | |
1573 | } | |
1574 | ||
1575 | #ifndef CONFIG_PACKET_MMAP | |
1576 | #define packet_mmap sock_no_mmap | |
1577 | #define packet_poll datagram_poll | |
1578 | #else | |
1579 | ||
1580 | static unsigned int packet_poll(struct file * file, struct socket *sock, | |
1581 | poll_table *wait) | |
1582 | { | |
1583 | struct sock *sk = sock->sk; | |
1584 | struct packet_sock *po = pkt_sk(sk); | |
1585 | unsigned int mask = datagram_poll(file, sock, wait); | |
1586 | ||
1587 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1588 | if (po->pg_vec) { | |
1589 | unsigned last = po->head ? po->head-1 : po->frame_max; | |
1590 | struct tpacket_hdr *h; | |
1591 | ||
1592 | h = (struct tpacket_hdr *)packet_lookup_frame(po, last); | |
1593 | ||
1594 | if (h->tp_status) | |
1595 | mask |= POLLIN | POLLRDNORM; | |
1596 | } | |
1597 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1598 | return mask; | |
1599 | } | |
1600 | ||
1601 | ||
1602 | /* Dirty? Well, I still did not learn better way to account | |
1603 | * for user mmaps. | |
1604 | */ | |
1605 | ||
1606 | static void packet_mm_open(struct vm_area_struct *vma) | |
1607 | { | |
1608 | struct file *file = vma->vm_file; | |
b69aee04 | 1609 | struct socket * sock = file->private_data; |
1da177e4 LT |
1610 | struct sock *sk = sock->sk; |
1611 | ||
1612 | if (sk) | |
1613 | atomic_inc(&pkt_sk(sk)->mapped); | |
1614 | } | |
1615 | ||
1616 | static void packet_mm_close(struct vm_area_struct *vma) | |
1617 | { | |
1618 | struct file *file = vma->vm_file; | |
b69aee04 | 1619 | struct socket * sock = file->private_data; |
1da177e4 LT |
1620 | struct sock *sk = sock->sk; |
1621 | ||
1622 | if (sk) | |
1623 | atomic_dec(&pkt_sk(sk)->mapped); | |
1624 | } | |
1625 | ||
1626 | static struct vm_operations_struct packet_mmap_ops = { | |
1627 | .open = packet_mm_open, | |
1628 | .close =packet_mm_close, | |
1629 | }; | |
1630 | ||
1631 | static inline struct page *pg_vec_endpage(char *one_pg_vec, unsigned int order) | |
1632 | { | |
1633 | return virt_to_page(one_pg_vec + (PAGE_SIZE << order) - 1); | |
1634 | } | |
1635 | ||
4ebf0ae2 | 1636 | static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len) |
1da177e4 LT |
1637 | { |
1638 | int i; | |
1639 | ||
4ebf0ae2 DM |
1640 | for (i = 0; i < len; i++) { |
1641 | if (likely(pg_vec[i])) | |
1642 | free_pages((unsigned long) pg_vec[i], order); | |
1da177e4 LT |
1643 | } |
1644 | kfree(pg_vec); | |
1645 | } | |
1646 | ||
4ebf0ae2 DM |
1647 | static inline char *alloc_one_pg_vec_page(unsigned long order) |
1648 | { | |
1649 | return (char *) __get_free_pages(GFP_KERNEL | __GFP_COMP | __GFP_ZERO, | |
1650 | order); | |
1651 | } | |
1652 | ||
1653 | static char **alloc_pg_vec(struct tpacket_req *req, int order) | |
1654 | { | |
1655 | unsigned int block_nr = req->tp_block_nr; | |
1656 | char **pg_vec; | |
1657 | int i; | |
1658 | ||
1659 | pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL); | |
1660 | if (unlikely(!pg_vec)) | |
1661 | goto out; | |
1662 | ||
1663 | for (i = 0; i < block_nr; i++) { | |
1664 | pg_vec[i] = alloc_one_pg_vec_page(order); | |
1665 | if (unlikely(!pg_vec[i])) | |
1666 | goto out_free_pgvec; | |
1667 | } | |
1668 | ||
1669 | out: | |
1670 | return pg_vec; | |
1671 | ||
1672 | out_free_pgvec: | |
1673 | free_pg_vec(pg_vec, order, block_nr); | |
1674 | pg_vec = NULL; | |
1675 | goto out; | |
1676 | } | |
1da177e4 LT |
1677 | |
1678 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing) | |
1679 | { | |
1680 | char **pg_vec = NULL; | |
1681 | struct packet_sock *po = pkt_sk(sk); | |
0e11c91e AV |
1682 | int was_running, order = 0; |
1683 | __be16 num; | |
1da177e4 LT |
1684 | int err = 0; |
1685 | ||
1686 | if (req->tp_block_nr) { | |
1687 | int i, l; | |
1688 | ||
1689 | /* Sanity tests and some calculations */ | |
1690 | ||
4ebf0ae2 | 1691 | if (unlikely(po->pg_vec)) |
1da177e4 LT |
1692 | return -EBUSY; |
1693 | ||
4ebf0ae2 | 1694 | if (unlikely((int)req->tp_block_size <= 0)) |
1da177e4 | 1695 | return -EINVAL; |
4ebf0ae2 | 1696 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
1da177e4 | 1697 | return -EINVAL; |
4ebf0ae2 | 1698 | if (unlikely(req->tp_frame_size < TPACKET_HDRLEN)) |
1da177e4 | 1699 | return -EINVAL; |
4ebf0ae2 | 1700 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
1da177e4 LT |
1701 | return -EINVAL; |
1702 | ||
1703 | po->frames_per_block = req->tp_block_size/req->tp_frame_size; | |
4ebf0ae2 | 1704 | if (unlikely(po->frames_per_block <= 0)) |
1da177e4 | 1705 | return -EINVAL; |
4ebf0ae2 DM |
1706 | if (unlikely((po->frames_per_block * req->tp_block_nr) != |
1707 | req->tp_frame_nr)) | |
1da177e4 | 1708 | return -EINVAL; |
1da177e4 LT |
1709 | |
1710 | err = -ENOMEM; | |
4ebf0ae2 DM |
1711 | order = get_order(req->tp_block_size); |
1712 | pg_vec = alloc_pg_vec(req, order); | |
1713 | if (unlikely(!pg_vec)) | |
1da177e4 | 1714 | goto out; |
1da177e4 LT |
1715 | |
1716 | l = 0; | |
4ebf0ae2 | 1717 | for (i = 0; i < req->tp_block_nr; i++) { |
1da177e4 LT |
1718 | char *ptr = pg_vec[i]; |
1719 | struct tpacket_hdr *header; | |
1720 | int k; | |
1721 | ||
4ebf0ae2 DM |
1722 | for (k = 0; k < po->frames_per_block; k++) { |
1723 | header = (struct tpacket_hdr *) ptr; | |
1da177e4 LT |
1724 | header->tp_status = TP_STATUS_KERNEL; |
1725 | ptr += req->tp_frame_size; | |
1726 | } | |
1727 | } | |
1728 | /* Done */ | |
1729 | } else { | |
4ebf0ae2 | 1730 | if (unlikely(req->tp_frame_nr)) |
1da177e4 LT |
1731 | return -EINVAL; |
1732 | } | |
1733 | ||
1734 | lock_sock(sk); | |
1735 | ||
1736 | /* Detach socket from network */ | |
1737 | spin_lock(&po->bind_lock); | |
1738 | was_running = po->running; | |
1739 | num = po->num; | |
1740 | if (was_running) { | |
1741 | __dev_remove_pack(&po->prot_hook); | |
1742 | po->num = 0; | |
1743 | po->running = 0; | |
1744 | __sock_put(sk); | |
1745 | } | |
1746 | spin_unlock(&po->bind_lock); | |
1747 | ||
1748 | synchronize_net(); | |
1749 | ||
1750 | err = -EBUSY; | |
1751 | if (closing || atomic_read(&po->mapped) == 0) { | |
1752 | err = 0; | |
1753 | #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) | |
1754 | ||
1755 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1756 | pg_vec = XC(po->pg_vec, pg_vec); | |
4ebf0ae2 | 1757 | po->frame_max = (req->tp_frame_nr - 1); |
1da177e4 LT |
1758 | po->head = 0; |
1759 | po->frame_size = req->tp_frame_size; | |
1760 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1761 | ||
1762 | order = XC(po->pg_vec_order, order); | |
1763 | req->tp_block_nr = XC(po->pg_vec_len, req->tp_block_nr); | |
1764 | ||
1765 | po->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
1766 | po->prot_hook.func = po->pg_vec ? tpacket_rcv : packet_rcv; | |
1767 | skb_queue_purge(&sk->sk_receive_queue); | |
1768 | #undef XC | |
1769 | if (atomic_read(&po->mapped)) | |
1770 | printk(KERN_DEBUG "packet_mmap: vma is busy: %d\n", atomic_read(&po->mapped)); | |
1771 | } | |
1772 | ||
1773 | spin_lock(&po->bind_lock); | |
1774 | if (was_running && !po->running) { | |
1775 | sock_hold(sk); | |
1776 | po->running = 1; | |
1777 | po->num = num; | |
1778 | dev_add_pack(&po->prot_hook); | |
1779 | } | |
1780 | spin_unlock(&po->bind_lock); | |
1781 | ||
1782 | release_sock(sk); | |
1783 | ||
1da177e4 LT |
1784 | if (pg_vec) |
1785 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
1786 | out: | |
1787 | return err; | |
1788 | } | |
1789 | ||
1790 | static int packet_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
1791 | { | |
1792 | struct sock *sk = sock->sk; | |
1793 | struct packet_sock *po = pkt_sk(sk); | |
1794 | unsigned long size; | |
1795 | unsigned long start; | |
1796 | int err = -EINVAL; | |
1797 | int i; | |
1798 | ||
1799 | if (vma->vm_pgoff) | |
1800 | return -EINVAL; | |
1801 | ||
1802 | size = vma->vm_end - vma->vm_start; | |
1803 | ||
1804 | lock_sock(sk); | |
1805 | if (po->pg_vec == NULL) | |
1806 | goto out; | |
1807 | if (size != po->pg_vec_len*po->pg_vec_pages*PAGE_SIZE) | |
1808 | goto out; | |
1809 | ||
1da177e4 | 1810 | start = vma->vm_start; |
4ebf0ae2 DM |
1811 | for (i = 0; i < po->pg_vec_len; i++) { |
1812 | struct page *page = virt_to_page(po->pg_vec[i]); | |
1813 | int pg_num; | |
1814 | ||
1815 | for (pg_num = 0; pg_num < po->pg_vec_pages; pg_num++, page++) { | |
1816 | err = vm_insert_page(vma, start, page); | |
1817 | if (unlikely(err)) | |
1818 | goto out; | |
1819 | start += PAGE_SIZE; | |
1820 | } | |
1da177e4 | 1821 | } |
4ebf0ae2 | 1822 | atomic_inc(&po->mapped); |
1da177e4 LT |
1823 | vma->vm_ops = &packet_mmap_ops; |
1824 | err = 0; | |
1825 | ||
1826 | out: | |
1827 | release_sock(sk); | |
1828 | return err; | |
1829 | } | |
1830 | #endif | |
1831 | ||
1832 | ||
1833 | #ifdef CONFIG_SOCK_PACKET | |
90ddc4f0 | 1834 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
1835 | .family = PF_PACKET, |
1836 | .owner = THIS_MODULE, | |
1837 | .release = packet_release, | |
1838 | .bind = packet_bind_spkt, | |
1839 | .connect = sock_no_connect, | |
1840 | .socketpair = sock_no_socketpair, | |
1841 | .accept = sock_no_accept, | |
1842 | .getname = packet_getname_spkt, | |
1843 | .poll = datagram_poll, | |
1844 | .ioctl = packet_ioctl, | |
1845 | .listen = sock_no_listen, | |
1846 | .shutdown = sock_no_shutdown, | |
1847 | .setsockopt = sock_no_setsockopt, | |
1848 | .getsockopt = sock_no_getsockopt, | |
1849 | .sendmsg = packet_sendmsg_spkt, | |
1850 | .recvmsg = packet_recvmsg, | |
1851 | .mmap = sock_no_mmap, | |
1852 | .sendpage = sock_no_sendpage, | |
1853 | }; | |
1854 | #endif | |
1855 | ||
90ddc4f0 | 1856 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
1857 | .family = PF_PACKET, |
1858 | .owner = THIS_MODULE, | |
1859 | .release = packet_release, | |
1860 | .bind = packet_bind, | |
1861 | .connect = sock_no_connect, | |
1862 | .socketpair = sock_no_socketpair, | |
1863 | .accept = sock_no_accept, | |
1864 | .getname = packet_getname, | |
1865 | .poll = packet_poll, | |
1866 | .ioctl = packet_ioctl, | |
1867 | .listen = sock_no_listen, | |
1868 | .shutdown = sock_no_shutdown, | |
1869 | .setsockopt = packet_setsockopt, | |
1870 | .getsockopt = packet_getsockopt, | |
1871 | .sendmsg = packet_sendmsg, | |
1872 | .recvmsg = packet_recvmsg, | |
1873 | .mmap = packet_mmap, | |
1874 | .sendpage = sock_no_sendpage, | |
1875 | }; | |
1876 | ||
1877 | static struct net_proto_family packet_family_ops = { | |
1878 | .family = PF_PACKET, | |
1879 | .create = packet_create, | |
1880 | .owner = THIS_MODULE, | |
1881 | }; | |
1882 | ||
1883 | static struct notifier_block packet_netdev_notifier = { | |
1884 | .notifier_call =packet_notifier, | |
1885 | }; | |
1886 | ||
1887 | #ifdef CONFIG_PROC_FS | |
1888 | static inline struct sock *packet_seq_idx(loff_t off) | |
1889 | { | |
1890 | struct sock *s; | |
1891 | struct hlist_node *node; | |
1892 | ||
1893 | sk_for_each(s, node, &packet_sklist) { | |
1894 | if (!off--) | |
1895 | return s; | |
1896 | } | |
1897 | return NULL; | |
1898 | } | |
1899 | ||
1900 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
1901 | { | |
1902 | read_lock(&packet_sklist_lock); | |
1903 | return *pos ? packet_seq_idx(*pos - 1) : SEQ_START_TOKEN; | |
1904 | } | |
1905 | ||
1906 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1907 | { | |
1908 | ++*pos; | |
1909 | return (v == SEQ_START_TOKEN) | |
1910 | ? sk_head(&packet_sklist) | |
1911 | : sk_next((struct sock*)v) ; | |
1912 | } | |
1913 | ||
1914 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
1915 | { | |
1916 | read_unlock(&packet_sklist_lock); | |
1917 | } | |
1918 | ||
1919 | static int packet_seq_show(struct seq_file *seq, void *v) | |
1920 | { | |
1921 | if (v == SEQ_START_TOKEN) | |
1922 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
1923 | else { | |
1924 | struct sock *s = v; | |
1925 | const struct packet_sock *po = pkt_sk(s); | |
1926 | ||
1927 | seq_printf(seq, | |
1928 | "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", | |
1929 | s, | |
1930 | atomic_read(&s->sk_refcnt), | |
1931 | s->sk_type, | |
1932 | ntohs(po->num), | |
1933 | po->ifindex, | |
1934 | po->running, | |
1935 | atomic_read(&s->sk_rmem_alloc), | |
1936 | sock_i_uid(s), | |
1937 | sock_i_ino(s) ); | |
1938 | } | |
1939 | ||
1940 | return 0; | |
1941 | } | |
1942 | ||
1943 | static struct seq_operations packet_seq_ops = { | |
1944 | .start = packet_seq_start, | |
1945 | .next = packet_seq_next, | |
1946 | .stop = packet_seq_stop, | |
1947 | .show = packet_seq_show, | |
1948 | }; | |
1949 | ||
1950 | static int packet_seq_open(struct inode *inode, struct file *file) | |
1951 | { | |
1952 | return seq_open(file, &packet_seq_ops); | |
1953 | } | |
1954 | ||
1955 | static struct file_operations packet_seq_fops = { | |
1956 | .owner = THIS_MODULE, | |
1957 | .open = packet_seq_open, | |
1958 | .read = seq_read, | |
1959 | .llseek = seq_lseek, | |
1960 | .release = seq_release, | |
1961 | }; | |
1962 | ||
1963 | #endif | |
1964 | ||
1965 | static void __exit packet_exit(void) | |
1966 | { | |
1967 | proc_net_remove("packet"); | |
1968 | unregister_netdevice_notifier(&packet_netdev_notifier); | |
1969 | sock_unregister(PF_PACKET); | |
1970 | proto_unregister(&packet_proto); | |
1971 | } | |
1972 | ||
1973 | static int __init packet_init(void) | |
1974 | { | |
1975 | int rc = proto_register(&packet_proto, 0); | |
1976 | ||
1977 | if (rc != 0) | |
1978 | goto out; | |
1979 | ||
1980 | sock_register(&packet_family_ops); | |
1981 | register_netdevice_notifier(&packet_netdev_notifier); | |
1982 | proc_net_fops_create("packet", 0, &packet_seq_fops); | |
1983 | out: | |
1984 | return rc; | |
1985 | } | |
1986 | ||
1987 | module_init(packet_init); | |
1988 | module_exit(packet_exit); | |
1989 | MODULE_LICENSE("GPL"); | |
1990 | MODULE_ALIAS_NETPROTO(PF_PACKET); |