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