Root/
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 | * Authors: Ross Biro |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> |
11 | * |
12 | * Fixes: |
13 | * Alan Cox : verify_area() now used correctly |
14 | * Alan Cox : new skbuff lists, look ma no backlogs! |
15 | * Alan Cox : tidied skbuff lists. |
16 | * Alan Cox : Now uses generic datagram routines I |
17 | * added. Also fixed the peek/read crash |
18 | * from all old Linux datagram code. |
19 | * Alan Cox : Uses the improved datagram code. |
20 | * Alan Cox : Added NULL's for socket options. |
21 | * Alan Cox : Re-commented the code. |
22 | * Alan Cox : Use new kernel side addressing |
23 | * Rob Janssen : Correct MTU usage. |
24 | * Dave Platt : Counter leaks caused by incorrect |
25 | * interrupt locking and some slightly |
26 | * dubious gcc output. Can you read |
27 | * compiler: it said _VOLATILE_ |
28 | * Richard Kooijman : Timestamp fixes. |
29 | * Alan Cox : New buffers. Use sk->mac.raw. |
30 | * Alan Cox : sendmsg/recvmsg support. |
31 | * Alan Cox : Protocol setting support |
32 | * Alexey Kuznetsov : Untied from IPv4 stack. |
33 | * Cyrus Durgin : Fixed kerneld for kmod. |
34 | * Michal Ostrowski : Module initialization cleanup. |
35 | * Ulises Alonso : Frame number limit removal and |
36 | * packet_set_ring memory leak. |
37 | * Eric Biederman : Allow for > 8 byte hardware addresses. |
38 | * The convention is that longer addresses |
39 | * will simply extend the hardware address |
40 | * byte arrays at the end of sockaddr_ll |
41 | * and packet_mreq. |
42 | * Johann Baudy : Added TX RING. |
43 | * |
44 | * This program is free software; you can redistribute it and/or |
45 | * modify it under the terms of the GNU General Public License |
46 | * as published by the Free Software Foundation; either version |
47 | * 2 of the License, or (at your option) any later version. |
48 | * |
49 | */ |
50 | |
51 | #include <linux/types.h> |
52 | #include <linux/mm.h> |
53 | #include <linux/capability.h> |
54 | #include <linux/fcntl.h> |
55 | #include <linux/socket.h> |
56 | #include <linux/in.h> |
57 | #include <linux/inet.h> |
58 | #include <linux/netdevice.h> |
59 | #include <linux/if_packet.h> |
60 | #include <linux/wireless.h> |
61 | #include <linux/kernel.h> |
62 | #include <linux/kmod.h> |
63 | #include <linux/slab.h> |
64 | #include <net/net_namespace.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> |
75 | #include <asm/cacheflush.h> |
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 | #include <linux/mutex.h> |
83 | #include <linux/if_vlan.h> |
84 | #include <linux/virtio_net.h> |
85 | |
86 | #ifdef CONFIG_INET |
87 | #include <net/inet_common.h> |
88 | #endif |
89 | |
90 | /* |
91 | Assumptions: |
92 | - if device has no dev->hard_header routine, it adds and removes ll header |
93 | inside itself. In this case ll header is invisible outside of device, |
94 | but higher levels still should reserve dev->hard_header_len. |
95 | Some devices are enough clever to reallocate skb, when header |
96 | will not fit to reserved space (tunnel), another ones are silly |
97 | (PPP). |
98 | - packet socket receives packets with pulled ll header, |
99 | so that SOCK_RAW should push it back. |
100 | |
101 | On receive: |
102 | ----------- |
103 | |
104 | Incoming, dev->hard_header!=NULL |
105 | mac_header -> ll header |
106 | data -> data |
107 | |
108 | Outgoing, dev->hard_header!=NULL |
109 | mac_header -> ll header |
110 | data -> ll header |
111 | |
112 | Incoming, dev->hard_header==NULL |
113 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
114 | header. PPP makes it, that is wrong, because introduce |
115 | assymetry between rx and tx paths. |
116 | data -> data |
117 | |
118 | Outgoing, dev->hard_header==NULL |
119 | mac_header -> data. ll header is still not built! |
120 | data -> data |
121 | |
122 | Resume |
123 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. |
124 | |
125 | |
126 | On transmit: |
127 | ------------ |
128 | |
129 | dev->hard_header != NULL |
130 | mac_header -> ll header |
131 | data -> ll header |
132 | |
133 | dev->hard_header == NULL (ll header is added by device, we cannot control it) |
134 | mac_header -> data |
135 | data -> data |
136 | |
137 | We should set nh.raw on output to correct posistion, |
138 | packet classifier depends on it. |
139 | */ |
140 | |
141 | /* Private packet socket structures. */ |
142 | |
143 | struct packet_mclist { |
144 | struct packet_mclist *next; |
145 | int ifindex; |
146 | int count; |
147 | unsigned short type; |
148 | unsigned short alen; |
149 | unsigned char addr[MAX_ADDR_LEN]; |
150 | }; |
151 | /* identical to struct packet_mreq except it has |
152 | * a longer address field. |
153 | */ |
154 | struct packet_mreq_max { |
155 | int mr_ifindex; |
156 | unsigned short mr_type; |
157 | unsigned short mr_alen; |
158 | unsigned char mr_address[MAX_ADDR_LEN]; |
159 | }; |
160 | |
161 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
162 | int closing, int tx_ring); |
163 | |
164 | struct packet_ring_buffer { |
165 | char **pg_vec; |
166 | unsigned int head; |
167 | unsigned int frames_per_block; |
168 | unsigned int frame_size; |
169 | unsigned int frame_max; |
170 | |
171 | unsigned int pg_vec_order; |
172 | unsigned int pg_vec_pages; |
173 | unsigned int pg_vec_len; |
174 | |
175 | atomic_t pending; |
176 | }; |
177 | |
178 | struct packet_sock; |
179 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg); |
180 | |
181 | static void packet_flush_mclist(struct sock *sk); |
182 | |
183 | struct packet_sock { |
184 | /* struct sock has to be the first member of packet_sock */ |
185 | struct sock sk; |
186 | struct tpacket_stats stats; |
187 | struct packet_ring_buffer rx_ring; |
188 | struct packet_ring_buffer tx_ring; |
189 | int copy_thresh; |
190 | spinlock_t bind_lock; |
191 | struct mutex pg_vec_lock; |
192 | unsigned int running:1, /* prot_hook is attached*/ |
193 | auxdata:1, |
194 | origdev:1, |
195 | has_vnet_hdr:1; |
196 | int ifindex; /* bound device */ |
197 | __be16 num; |
198 | struct packet_mclist *mclist; |
199 | atomic_t mapped; |
200 | enum tpacket_versions tp_version; |
201 | unsigned int tp_hdrlen; |
202 | unsigned int tp_reserve; |
203 | unsigned int tp_loss:1; |
204 | struct packet_type prot_hook ____cacheline_aligned_in_smp; |
205 | }; |
206 | |
207 | struct packet_skb_cb { |
208 | unsigned int origlen; |
209 | union { |
210 | struct sockaddr_pkt pkt; |
211 | struct sockaddr_ll ll; |
212 | } sa; |
213 | }; |
214 | |
215 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) |
216 | |
217 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
218 | { |
219 | union { |
220 | struct tpacket_hdr *h1; |
221 | struct tpacket2_hdr *h2; |
222 | void *raw; |
223 | } h; |
224 | |
225 | h.raw = frame; |
226 | switch (po->tp_version) { |
227 | case TPACKET_V1: |
228 | h.h1->tp_status = status; |
229 | flush_dcache_page(virt_to_page(&h.h1->tp_status)); |
230 | break; |
231 | case TPACKET_V2: |
232 | h.h2->tp_status = status; |
233 | flush_dcache_page(virt_to_page(&h.h2->tp_status)); |
234 | break; |
235 | default: |
236 | pr_err("TPACKET version not supported\n"); |
237 | BUG(); |
238 | } |
239 | |
240 | smp_wmb(); |
241 | } |
242 | |
243 | static int __packet_get_status(struct packet_sock *po, void *frame) |
244 | { |
245 | union { |
246 | struct tpacket_hdr *h1; |
247 | struct tpacket2_hdr *h2; |
248 | void *raw; |
249 | } h; |
250 | |
251 | smp_rmb(); |
252 | |
253 | h.raw = frame; |
254 | switch (po->tp_version) { |
255 | case TPACKET_V1: |
256 | flush_dcache_page(virt_to_page(&h.h1->tp_status)); |
257 | return h.h1->tp_status; |
258 | case TPACKET_V2: |
259 | flush_dcache_page(virt_to_page(&h.h2->tp_status)); |
260 | return h.h2->tp_status; |
261 | default: |
262 | pr_err("TPACKET version not supported\n"); |
263 | BUG(); |
264 | return 0; |
265 | } |
266 | } |
267 | |
268 | static void *packet_lookup_frame(struct packet_sock *po, |
269 | struct packet_ring_buffer *rb, |
270 | unsigned int position, |
271 | int status) |
272 | { |
273 | unsigned int pg_vec_pos, frame_offset; |
274 | union { |
275 | struct tpacket_hdr *h1; |
276 | struct tpacket2_hdr *h2; |
277 | void *raw; |
278 | } h; |
279 | |
280 | pg_vec_pos = position / rb->frames_per_block; |
281 | frame_offset = position % rb->frames_per_block; |
282 | |
283 | h.raw = rb->pg_vec[pg_vec_pos] + (frame_offset * rb->frame_size); |
284 | |
285 | if (status != __packet_get_status(po, h.raw)) |
286 | return NULL; |
287 | |
288 | return h.raw; |
289 | } |
290 | |
291 | static inline void *packet_current_frame(struct packet_sock *po, |
292 | struct packet_ring_buffer *rb, |
293 | int status) |
294 | { |
295 | return packet_lookup_frame(po, rb, rb->head, status); |
296 | } |
297 | |
298 | static inline void *packet_previous_frame(struct packet_sock *po, |
299 | struct packet_ring_buffer *rb, |
300 | int status) |
301 | { |
302 | unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; |
303 | return packet_lookup_frame(po, rb, previous, status); |
304 | } |
305 | |
306 | static inline void packet_increment_head(struct packet_ring_buffer *buff) |
307 | { |
308 | buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; |
309 | } |
310 | |
311 | static inline struct packet_sock *pkt_sk(struct sock *sk) |
312 | { |
313 | return (struct packet_sock *)sk; |
314 | } |
315 | |
316 | static void packet_sock_destruct(struct sock *sk) |
317 | { |
318 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
319 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
320 | |
321 | if (!sock_flag(sk, SOCK_DEAD)) { |
322 | pr_err("Attempt to release alive packet socket: %p\n", sk); |
323 | return; |
324 | } |
325 | |
326 | sk_refcnt_debug_dec(sk); |
327 | } |
328 | |
329 | |
330 | static const struct proto_ops packet_ops; |
331 | |
332 | static const struct proto_ops packet_ops_spkt; |
333 | |
334 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
335 | struct packet_type *pt, struct net_device *orig_dev) |
336 | { |
337 | struct sock *sk; |
338 | struct sockaddr_pkt *spkt; |
339 | |
340 | /* |
341 | * When we registered the protocol we saved the socket in the data |
342 | * field for just this event. |
343 | */ |
344 | |
345 | sk = pt->af_packet_priv; |
346 | |
347 | /* |
348 | * Yank back the headers [hope the device set this |
349 | * right or kerboom...] |
350 | * |
351 | * Incoming packets have ll header pulled, |
352 | * push it back. |
353 | * |
354 | * For outgoing ones skb->data == skb_mac_header(skb) |
355 | * so that this procedure is noop. |
356 | */ |
357 | |
358 | if (skb->pkt_type == PACKET_LOOPBACK) |
359 | goto out; |
360 | |
361 | if (!net_eq(dev_net(dev), sock_net(sk))) |
362 | goto out; |
363 | |
364 | skb = skb_share_check(skb, GFP_ATOMIC); |
365 | if (skb == NULL) |
366 | goto oom; |
367 | |
368 | /* drop any routing info */ |
369 | skb_dst_drop(skb); |
370 | |
371 | /* drop conntrack reference */ |
372 | nf_reset(skb); |
373 | |
374 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
375 | |
376 | skb_push(skb, skb->data - skb_mac_header(skb)); |
377 | |
378 | /* |
379 | * The SOCK_PACKET socket receives _all_ frames. |
380 | */ |
381 | |
382 | spkt->spkt_family = dev->type; |
383 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); |
384 | spkt->spkt_protocol = skb->protocol; |
385 | |
386 | /* |
387 | * Charge the memory to the socket. This is done specifically |
388 | * to prevent sockets using all the memory up. |
389 | */ |
390 | |
391 | if (sock_queue_rcv_skb(sk, skb) == 0) |
392 | return 0; |
393 | |
394 | out: |
395 | kfree_skb(skb); |
396 | oom: |
397 | return 0; |
398 | } |
399 | |
400 | |
401 | /* |
402 | * Output a raw packet to a device layer. This bypasses all the other |
403 | * protocol layers and you must therefore supply it with a complete frame |
404 | */ |
405 | |
406 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, |
407 | struct msghdr *msg, size_t len) |
408 | { |
409 | struct sock *sk = sock->sk; |
410 | struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name; |
411 | struct sk_buff *skb = NULL; |
412 | struct net_device *dev; |
413 | __be16 proto = 0; |
414 | int err; |
415 | |
416 | /* |
417 | * Get and verify the address. |
418 | */ |
419 | |
420 | if (saddr) { |
421 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
422 | return -EINVAL; |
423 | if (msg->msg_namelen == sizeof(struct sockaddr_pkt)) |
424 | proto = saddr->spkt_protocol; |
425 | } else |
426 | return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */ |
427 | |
428 | /* |
429 | * Find the device first to size check it |
430 | */ |
431 | |
432 | saddr->spkt_device[13] = 0; |
433 | retry: |
434 | rcu_read_lock(); |
435 | dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); |
436 | err = -ENODEV; |
437 | if (dev == NULL) |
438 | goto out_unlock; |
439 | |
440 | err = -ENETDOWN; |
441 | if (!(dev->flags & IFF_UP)) |
442 | goto out_unlock; |
443 | |
444 | /* |
445 | * You may not queue a frame bigger than the mtu. This is the lowest level |
446 | * raw protocol and you must do your own fragmentation at this level. |
447 | */ |
448 | |
449 | err = -EMSGSIZE; |
450 | if (len > dev->mtu + dev->hard_header_len) |
451 | goto out_unlock; |
452 | |
453 | if (!skb) { |
454 | size_t reserved = LL_RESERVED_SPACE(dev); |
455 | unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0; |
456 | |
457 | rcu_read_unlock(); |
458 | skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL); |
459 | if (skb == NULL) |
460 | return -ENOBUFS; |
461 | /* FIXME: Save some space for broken drivers that write a hard |
462 | * header at transmission time by themselves. PPP is the notable |
463 | * one here. This should really be fixed at the driver level. |
464 | */ |
465 | skb_reserve(skb, reserved); |
466 | skb_reset_network_header(skb); |
467 | |
468 | /* Try to align data part correctly */ |
469 | if (hhlen) { |
470 | skb->data -= hhlen; |
471 | skb->tail -= hhlen; |
472 | if (len < hhlen) |
473 | skb_reset_network_header(skb); |
474 | } |
475 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
476 | if (err) |
477 | goto out_free; |
478 | goto retry; |
479 | } |
480 | |
481 | |
482 | skb->protocol = proto; |
483 | skb->dev = dev; |
484 | skb->priority = sk->sk_priority; |
485 | skb->mark = sk->sk_mark; |
486 | |
487 | dev_queue_xmit(skb); |
488 | rcu_read_unlock(); |
489 | return len; |
490 | |
491 | out_unlock: |
492 | rcu_read_unlock(); |
493 | out_free: |
494 | kfree_skb(skb); |
495 | return err; |
496 | } |
497 | |
498 | static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk, |
499 | unsigned int res) |
500 | { |
501 | struct sk_filter *filter; |
502 | |
503 | rcu_read_lock_bh(); |
504 | filter = rcu_dereference_bh(sk->sk_filter); |
505 | if (filter != NULL) |
506 | res = sk_run_filter(skb, filter->insns, filter->len); |
507 | rcu_read_unlock_bh(); |
508 | |
509 | return res; |
510 | } |
511 | |
512 | /* |
513 | This function makes lazy skb cloning in hope that most of packets |
514 | are discarded by BPF. |
515 | |
516 | Note tricky part: we DO mangle shared skb! skb->data, skb->len |
517 | and skb->cb are mangled. It works because (and until) packets |
518 | falling here are owned by current CPU. Output packets are cloned |
519 | by dev_queue_xmit_nit(), input packets are processed by net_bh |
520 | sequencially, so that if we return skb to original state on exit, |
521 | we will not harm anyone. |
522 | */ |
523 | |
524 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
525 | struct packet_type *pt, struct net_device *orig_dev) |
526 | { |
527 | struct sock *sk; |
528 | struct sockaddr_ll *sll; |
529 | struct packet_sock *po; |
530 | u8 *skb_head = skb->data; |
531 | int skb_len = skb->len; |
532 | unsigned int snaplen, res; |
533 | |
534 | if (skb->pkt_type == PACKET_LOOPBACK) |
535 | goto drop; |
536 | |
537 | sk = pt->af_packet_priv; |
538 | po = pkt_sk(sk); |
539 | |
540 | if (!net_eq(dev_net(dev), sock_net(sk))) |
541 | goto drop; |
542 | |
543 | skb->dev = dev; |
544 | |
545 | if (dev->header_ops) { |
546 | /* The device has an explicit notion of ll header, |
547 | exported to higher levels. |
548 | |
549 | Otherwise, the device hides datails of it frame |
550 | structure, so that corresponding packet head |
551 | never delivered to user. |
552 | */ |
553 | if (sk->sk_type != SOCK_DGRAM) |
554 | skb_push(skb, skb->data - skb_mac_header(skb)); |
555 | else if (skb->pkt_type == PACKET_OUTGOING) { |
556 | /* Special case: outgoing packets have ll header at head */ |
557 | skb_pull(skb, skb_network_offset(skb)); |
558 | } |
559 | } |
560 | |
561 | snaplen = skb->len; |
562 | |
563 | res = run_filter(skb, sk, snaplen); |
564 | if (!res) |
565 | goto drop_n_restore; |
566 | if (snaplen > res) |
567 | snaplen = res; |
568 | |
569 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= |
570 | (unsigned)sk->sk_rcvbuf) |
571 | goto drop_n_acct; |
572 | |
573 | if (skb_shared(skb)) { |
574 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); |
575 | if (nskb == NULL) |
576 | goto drop_n_acct; |
577 | |
578 | if (skb_head != skb->data) { |
579 | skb->data = skb_head; |
580 | skb->len = skb_len; |
581 | } |
582 | kfree_skb(skb); |
583 | skb = nskb; |
584 | } |
585 | |
586 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
587 | sizeof(skb->cb)); |
588 | |
589 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
590 | sll->sll_family = AF_PACKET; |
591 | sll->sll_hatype = dev->type; |
592 | sll->sll_protocol = skb->protocol; |
593 | sll->sll_pkttype = skb->pkt_type; |
594 | if (unlikely(po->origdev)) |
595 | sll->sll_ifindex = orig_dev->ifindex; |
596 | else |
597 | sll->sll_ifindex = dev->ifindex; |
598 | |
599 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
600 | |
601 | PACKET_SKB_CB(skb)->origlen = skb->len; |
602 | |
603 | if (pskb_trim(skb, snaplen)) |
604 | goto drop_n_acct; |
605 | |
606 | skb_set_owner_r(skb, sk); |
607 | skb->dev = NULL; |
608 | skb_dst_drop(skb); |
609 | |
610 | /* drop conntrack reference */ |
611 | nf_reset(skb); |
612 | |
613 | spin_lock(&sk->sk_receive_queue.lock); |
614 | po->stats.tp_packets++; |
615 | skb->dropcount = atomic_read(&sk->sk_drops); |
616 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
617 | spin_unlock(&sk->sk_receive_queue.lock); |
618 | sk->sk_data_ready(sk, skb->len); |
619 | return 0; |
620 | |
621 | drop_n_acct: |
622 | po->stats.tp_drops = atomic_inc_return(&sk->sk_drops); |
623 | |
624 | drop_n_restore: |
625 | if (skb_head != skb->data && skb_shared(skb)) { |
626 | skb->data = skb_head; |
627 | skb->len = skb_len; |
628 | } |
629 | drop: |
630 | consume_skb(skb); |
631 | return 0; |
632 | } |
633 | |
634 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
635 | struct packet_type *pt, struct net_device *orig_dev) |
636 | { |
637 | struct sock *sk; |
638 | struct packet_sock *po; |
639 | struct sockaddr_ll *sll; |
640 | union { |
641 | struct tpacket_hdr *h1; |
642 | struct tpacket2_hdr *h2; |
643 | void *raw; |
644 | } h; |
645 | u8 *skb_head = skb->data; |
646 | int skb_len = skb->len; |
647 | unsigned int snaplen, res; |
648 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
649 | unsigned short macoff, netoff, hdrlen; |
650 | struct sk_buff *copy_skb = NULL; |
651 | struct timeval tv; |
652 | struct timespec ts; |
653 | |
654 | if (skb->pkt_type == PACKET_LOOPBACK) |
655 | goto drop; |
656 | |
657 | sk = pt->af_packet_priv; |
658 | po = pkt_sk(sk); |
659 | |
660 | if (!net_eq(dev_net(dev), sock_net(sk))) |
661 | goto drop; |
662 | |
663 | if (dev->header_ops) { |
664 | if (sk->sk_type != SOCK_DGRAM) |
665 | skb_push(skb, skb->data - skb_mac_header(skb)); |
666 | else if (skb->pkt_type == PACKET_OUTGOING) { |
667 | /* Special case: outgoing packets have ll header at head */ |
668 | skb_pull(skb, skb_network_offset(skb)); |
669 | } |
670 | } |
671 | |
672 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
673 | status |= TP_STATUS_CSUMNOTREADY; |
674 | |
675 | snaplen = skb->len; |
676 | |
677 | res = run_filter(skb, sk, snaplen); |
678 | if (!res) |
679 | goto drop_n_restore; |
680 | if (snaplen > res) |
681 | snaplen = res; |
682 | |
683 | if (sk->sk_type == SOCK_DGRAM) { |
684 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
685 | po->tp_reserve; |
686 | } else { |
687 | unsigned maclen = skb_network_offset(skb); |
688 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
689 | (maclen < 16 ? 16 : maclen)) + |
690 | po->tp_reserve; |
691 | macoff = netoff - maclen; |
692 | } |
693 | |
694 | if (macoff + snaplen > po->rx_ring.frame_size) { |
695 | if (po->copy_thresh && |
696 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < |
697 | (unsigned)sk->sk_rcvbuf) { |
698 | if (skb_shared(skb)) { |
699 | copy_skb = skb_clone(skb, GFP_ATOMIC); |
700 | } else { |
701 | copy_skb = skb_get(skb); |
702 | skb_head = skb->data; |
703 | } |
704 | if (copy_skb) |
705 | skb_set_owner_r(copy_skb, sk); |
706 | } |
707 | snaplen = po->rx_ring.frame_size - macoff; |
708 | if ((int)snaplen < 0) |
709 | snaplen = 0; |
710 | } |
711 | |
712 | spin_lock(&sk->sk_receive_queue.lock); |
713 | h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL); |
714 | if (!h.raw) |
715 | goto ring_is_full; |
716 | packet_increment_head(&po->rx_ring); |
717 | po->stats.tp_packets++; |
718 | if (copy_skb) { |
719 | status |= TP_STATUS_COPY; |
720 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); |
721 | } |
722 | if (!po->stats.tp_drops) |
723 | status &= ~TP_STATUS_LOSING; |
724 | spin_unlock(&sk->sk_receive_queue.lock); |
725 | |
726 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
727 | |
728 | switch (po->tp_version) { |
729 | case TPACKET_V1: |
730 | h.h1->tp_len = skb->len; |
731 | h.h1->tp_snaplen = snaplen; |
732 | h.h1->tp_mac = macoff; |
733 | h.h1->tp_net = netoff; |
734 | if (skb->tstamp.tv64) |
735 | tv = ktime_to_timeval(skb->tstamp); |
736 | else |
737 | do_gettimeofday(&tv); |
738 | h.h1->tp_sec = tv.tv_sec; |
739 | h.h1->tp_usec = tv.tv_usec; |
740 | hdrlen = sizeof(*h.h1); |
741 | break; |
742 | case TPACKET_V2: |
743 | h.h2->tp_len = skb->len; |
744 | h.h2->tp_snaplen = snaplen; |
745 | h.h2->tp_mac = macoff; |
746 | h.h2->tp_net = netoff; |
747 | if (skb->tstamp.tv64) |
748 | ts = ktime_to_timespec(skb->tstamp); |
749 | else |
750 | getnstimeofday(&ts); |
751 | h.h2->tp_sec = ts.tv_sec; |
752 | h.h2->tp_nsec = ts.tv_nsec; |
753 | h.h2->tp_vlan_tci = vlan_tx_tag_get(skb); |
754 | hdrlen = sizeof(*h.h2); |
755 | break; |
756 | default: |
757 | BUG(); |
758 | } |
759 | |
760 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
761 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
762 | sll->sll_family = AF_PACKET; |
763 | sll->sll_hatype = dev->type; |
764 | sll->sll_protocol = skb->protocol; |
765 | sll->sll_pkttype = skb->pkt_type; |
766 | if (unlikely(po->origdev)) |
767 | sll->sll_ifindex = orig_dev->ifindex; |
768 | else |
769 | sll->sll_ifindex = dev->ifindex; |
770 | |
771 | __packet_set_status(po, h.raw, status); |
772 | smp_mb(); |
773 | { |
774 | struct page *p_start, *p_end; |
775 | u8 *h_end = h.raw + macoff + snaplen - 1; |
776 | |
777 | p_start = virt_to_page(h.raw); |
778 | p_end = virt_to_page(h_end); |
779 | while (p_start <= p_end) { |
780 | flush_dcache_page(p_start); |
781 | p_start++; |
782 | } |
783 | } |
784 | |
785 | sk->sk_data_ready(sk, 0); |
786 | |
787 | drop_n_restore: |
788 | if (skb_head != skb->data && skb_shared(skb)) { |
789 | skb->data = skb_head; |
790 | skb->len = skb_len; |
791 | } |
792 | drop: |
793 | kfree_skb(skb); |
794 | return 0; |
795 | |
796 | ring_is_full: |
797 | po->stats.tp_drops++; |
798 | spin_unlock(&sk->sk_receive_queue.lock); |
799 | |
800 | sk->sk_data_ready(sk, 0); |
801 | kfree_skb(copy_skb); |
802 | goto drop_n_restore; |
803 | } |
804 | |
805 | static void tpacket_destruct_skb(struct sk_buff *skb) |
806 | { |
807 | struct packet_sock *po = pkt_sk(skb->sk); |
808 | void *ph; |
809 | |
810 | BUG_ON(skb == NULL); |
811 | |
812 | if (likely(po->tx_ring.pg_vec)) { |
813 | ph = skb_shinfo(skb)->destructor_arg; |
814 | BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING); |
815 | BUG_ON(atomic_read(&po->tx_ring.pending) == 0); |
816 | atomic_dec(&po->tx_ring.pending); |
817 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE); |
818 | } |
819 | |
820 | sock_wfree(skb); |
821 | } |
822 | |
823 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
824 | void *frame, struct net_device *dev, int size_max, |
825 | __be16 proto, unsigned char *addr) |
826 | { |
827 | union { |
828 | struct tpacket_hdr *h1; |
829 | struct tpacket2_hdr *h2; |
830 | void *raw; |
831 | } ph; |
832 | int to_write, offset, len, tp_len, nr_frags, len_max; |
833 | struct socket *sock = po->sk.sk_socket; |
834 | struct page *page; |
835 | void *data; |
836 | int err; |
837 | |
838 | ph.raw = frame; |
839 | |
840 | skb->protocol = proto; |
841 | skb->dev = dev; |
842 | skb->priority = po->sk.sk_priority; |
843 | skb->mark = po->sk.sk_mark; |
844 | skb_shinfo(skb)->destructor_arg = ph.raw; |
845 | |
846 | switch (po->tp_version) { |
847 | case TPACKET_V2: |
848 | tp_len = ph.h2->tp_len; |
849 | break; |
850 | default: |
851 | tp_len = ph.h1->tp_len; |
852 | break; |
853 | } |
854 | if (unlikely(tp_len > size_max)) { |
855 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); |
856 | return -EMSGSIZE; |
857 | } |
858 | |
859 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
860 | skb_reset_network_header(skb); |
861 | |
862 | data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll); |
863 | to_write = tp_len; |
864 | |
865 | if (sock->type == SOCK_DGRAM) { |
866 | err = dev_hard_header(skb, dev, ntohs(proto), addr, |
867 | NULL, tp_len); |
868 | if (unlikely(err < 0)) |
869 | return -EINVAL; |
870 | } else if (dev->hard_header_len) { |
871 | /* net device doesn't like empty head */ |
872 | if (unlikely(tp_len <= dev->hard_header_len)) { |
873 | pr_err("packet size is too short (%d < %d)\n", |
874 | tp_len, dev->hard_header_len); |
875 | return -EINVAL; |
876 | } |
877 | |
878 | skb_push(skb, dev->hard_header_len); |
879 | err = skb_store_bits(skb, 0, data, |
880 | dev->hard_header_len); |
881 | if (unlikely(err)) |
882 | return err; |
883 | |
884 | data += dev->hard_header_len; |
885 | to_write -= dev->hard_header_len; |
886 | } |
887 | |
888 | err = -EFAULT; |
889 | page = virt_to_page(data); |
890 | offset = offset_in_page(data); |
891 | len_max = PAGE_SIZE - offset; |
892 | len = ((to_write > len_max) ? len_max : to_write); |
893 | |
894 | skb->data_len = to_write; |
895 | skb->len += to_write; |
896 | skb->truesize += to_write; |
897 | atomic_add(to_write, &po->sk.sk_wmem_alloc); |
898 | |
899 | while (likely(to_write)) { |
900 | nr_frags = skb_shinfo(skb)->nr_frags; |
901 | |
902 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { |
903 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
904 | MAX_SKB_FRAGS); |
905 | return -EFAULT; |
906 | } |
907 | |
908 | flush_dcache_page(page); |
909 | get_page(page); |
910 | skb_fill_page_desc(skb, |
911 | nr_frags, |
912 | page++, offset, len); |
913 | to_write -= len; |
914 | offset = 0; |
915 | len_max = PAGE_SIZE; |
916 | len = ((to_write > len_max) ? len_max : to_write); |
917 | } |
918 | |
919 | return tp_len; |
920 | } |
921 | |
922 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) |
923 | { |
924 | struct socket *sock; |
925 | struct sk_buff *skb; |
926 | struct net_device *dev; |
927 | __be16 proto; |
928 | int ifindex, err, reserve = 0; |
929 | void *ph; |
930 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
931 | int tp_len, size_max; |
932 | unsigned char *addr; |
933 | int len_sum = 0; |
934 | int status = 0; |
935 | |
936 | sock = po->sk.sk_socket; |
937 | |
938 | mutex_lock(&po->pg_vec_lock); |
939 | |
940 | err = -EBUSY; |
941 | if (saddr == NULL) { |
942 | ifindex = po->ifindex; |
943 | proto = po->num; |
944 | addr = NULL; |
945 | } else { |
946 | err = -EINVAL; |
947 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) |
948 | goto out; |
949 | if (msg->msg_namelen < (saddr->sll_halen |
950 | + offsetof(struct sockaddr_ll, |
951 | sll_addr))) |
952 | goto out; |
953 | ifindex = saddr->sll_ifindex; |
954 | proto = saddr->sll_protocol; |
955 | addr = saddr->sll_addr; |
956 | } |
957 | |
958 | dev = dev_get_by_index(sock_net(&po->sk), ifindex); |
959 | err = -ENXIO; |
960 | if (unlikely(dev == NULL)) |
961 | goto out; |
962 | |
963 | reserve = dev->hard_header_len; |
964 | |
965 | err = -ENETDOWN; |
966 | if (unlikely(!(dev->flags & IFF_UP))) |
967 | goto out_put; |
968 | |
969 | size_max = po->tx_ring.frame_size |
970 | - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
971 | |
972 | if (size_max > dev->mtu + reserve) |
973 | size_max = dev->mtu + reserve; |
974 | |
975 | do { |
976 | ph = packet_current_frame(po, &po->tx_ring, |
977 | TP_STATUS_SEND_REQUEST); |
978 | |
979 | if (unlikely(ph == NULL)) { |
980 | schedule(); |
981 | continue; |
982 | } |
983 | |
984 | status = TP_STATUS_SEND_REQUEST; |
985 | skb = sock_alloc_send_skb(&po->sk, |
986 | LL_ALLOCATED_SPACE(dev) |
987 | + sizeof(struct sockaddr_ll), |
988 | 0, &err); |
989 | |
990 | if (unlikely(skb == NULL)) |
991 | goto out_status; |
992 | |
993 | tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto, |
994 | addr); |
995 | |
996 | if (unlikely(tp_len < 0)) { |
997 | if (po->tp_loss) { |
998 | __packet_set_status(po, ph, |
999 | TP_STATUS_AVAILABLE); |
1000 | packet_increment_head(&po->tx_ring); |
1001 | kfree_skb(skb); |
1002 | continue; |
1003 | } else { |
1004 | status = TP_STATUS_WRONG_FORMAT; |
1005 | err = tp_len; |
1006 | goto out_status; |
1007 | } |
1008 | } |
1009 | |
1010 | skb->destructor = tpacket_destruct_skb; |
1011 | __packet_set_status(po, ph, TP_STATUS_SENDING); |
1012 | atomic_inc(&po->tx_ring.pending); |
1013 | |
1014 | status = TP_STATUS_SEND_REQUEST; |
1015 | err = dev_queue_xmit(skb); |
1016 | if (unlikely(err > 0)) { |
1017 | err = net_xmit_errno(err); |
1018 | if (err && __packet_get_status(po, ph) == |
1019 | TP_STATUS_AVAILABLE) { |
1020 | /* skb was destructed already */ |
1021 | skb = NULL; |
1022 | goto out_status; |
1023 | } |
1024 | /* |
1025 | * skb was dropped but not destructed yet; |
1026 | * let's treat it like congestion or err < 0 |
1027 | */ |
1028 | err = 0; |
1029 | } |
1030 | packet_increment_head(&po->tx_ring); |
1031 | len_sum += tp_len; |
1032 | } while (likely((ph != NULL) || |
1033 | ((!(msg->msg_flags & MSG_DONTWAIT)) && |
1034 | (atomic_read(&po->tx_ring.pending)))) |
1035 | ); |
1036 | |
1037 | err = len_sum; |
1038 | goto out_put; |
1039 | |
1040 | out_status: |
1041 | __packet_set_status(po, ph, status); |
1042 | kfree_skb(skb); |
1043 | out_put: |
1044 | dev_put(dev); |
1045 | out: |
1046 | mutex_unlock(&po->pg_vec_lock); |
1047 | return err; |
1048 | } |
1049 | |
1050 | static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad, |
1051 | size_t reserve, size_t len, |
1052 | size_t linear, int noblock, |
1053 | int *err) |
1054 | { |
1055 | struct sk_buff *skb; |
1056 | |
1057 | /* Under a page? Don't bother with paged skb. */ |
1058 | if (prepad + len < PAGE_SIZE || !linear) |
1059 | linear = len; |
1060 | |
1061 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
1062 | err); |
1063 | if (!skb) |
1064 | return NULL; |
1065 | |
1066 | skb_reserve(skb, reserve); |
1067 | skb_put(skb, linear); |
1068 | skb->data_len = len - linear; |
1069 | skb->len += len - linear; |
1070 | |
1071 | return skb; |
1072 | } |
1073 | |
1074 | static int packet_snd(struct socket *sock, |
1075 | struct msghdr *msg, size_t len) |
1076 | { |
1077 | struct sock *sk = sock->sk; |
1078 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
1079 | struct sk_buff *skb; |
1080 | struct net_device *dev; |
1081 | __be16 proto; |
1082 | unsigned char *addr; |
1083 | int ifindex, err, reserve = 0; |
1084 | struct virtio_net_hdr vnet_hdr = { 0 }; |
1085 | int offset = 0; |
1086 | int vnet_hdr_len; |
1087 | struct packet_sock *po = pkt_sk(sk); |
1088 | unsigned short gso_type = 0; |
1089 | |
1090 | /* |
1091 | * Get and verify the address. |
1092 | */ |
1093 | |
1094 | if (saddr == NULL) { |
1095 | ifindex = po->ifindex; |
1096 | proto = po->num; |
1097 | addr = NULL; |
1098 | } else { |
1099 | err = -EINVAL; |
1100 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) |
1101 | goto out; |
1102 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
1103 | goto out; |
1104 | ifindex = saddr->sll_ifindex; |
1105 | proto = saddr->sll_protocol; |
1106 | addr = saddr->sll_addr; |
1107 | } |
1108 | |
1109 | |
1110 | dev = dev_get_by_index(sock_net(sk), ifindex); |
1111 | err = -ENXIO; |
1112 | if (dev == NULL) |
1113 | goto out_unlock; |
1114 | if (sock->type == SOCK_RAW) |
1115 | reserve = dev->hard_header_len; |
1116 | |
1117 | err = -ENETDOWN; |
1118 | if (!(dev->flags & IFF_UP)) |
1119 | goto out_unlock; |
1120 | |
1121 | if (po->has_vnet_hdr) { |
1122 | vnet_hdr_len = sizeof(vnet_hdr); |
1123 | |
1124 | err = -EINVAL; |
1125 | if (len < vnet_hdr_len) |
1126 | goto out_unlock; |
1127 | |
1128 | len -= vnet_hdr_len; |
1129 | |
1130 | err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov, |
1131 | vnet_hdr_len); |
1132 | if (err < 0) |
1133 | goto out_unlock; |
1134 | |
1135 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
1136 | (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 > |
1137 | vnet_hdr.hdr_len)) |
1138 | vnet_hdr.hdr_len = vnet_hdr.csum_start + |
1139 | vnet_hdr.csum_offset + 2; |
1140 | |
1141 | err = -EINVAL; |
1142 | if (vnet_hdr.hdr_len > len) |
1143 | goto out_unlock; |
1144 | |
1145 | if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
1146 | switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
1147 | case VIRTIO_NET_HDR_GSO_TCPV4: |
1148 | gso_type = SKB_GSO_TCPV4; |
1149 | break; |
1150 | case VIRTIO_NET_HDR_GSO_TCPV6: |
1151 | gso_type = SKB_GSO_TCPV6; |
1152 | break; |
1153 | case VIRTIO_NET_HDR_GSO_UDP: |
1154 | gso_type = SKB_GSO_UDP; |
1155 | break; |
1156 | default: |
1157 | goto out_unlock; |
1158 | } |
1159 | |
1160 | if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
1161 | gso_type |= SKB_GSO_TCP_ECN; |
1162 | |
1163 | if (vnet_hdr.gso_size == 0) |
1164 | goto out_unlock; |
1165 | |
1166 | } |
1167 | } |
1168 | |
1169 | err = -EMSGSIZE; |
1170 | if (!gso_type && (len > dev->mtu+reserve)) |
1171 | goto out_unlock; |
1172 | |
1173 | err = -ENOBUFS; |
1174 | skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev), |
1175 | LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len, |
1176 | msg->msg_flags & MSG_DONTWAIT, &err); |
1177 | if (skb == NULL) |
1178 | goto out_unlock; |
1179 | |
1180 | skb_set_network_header(skb, reserve); |
1181 | |
1182 | err = -EINVAL; |
1183 | if (sock->type == SOCK_DGRAM && |
1184 | (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0) |
1185 | goto out_free; |
1186 | |
1187 | /* Returns -EFAULT on error */ |
1188 | err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len); |
1189 | if (err) |
1190 | goto out_free; |
1191 | |
1192 | skb->protocol = proto; |
1193 | skb->dev = dev; |
1194 | skb->priority = sk->sk_priority; |
1195 | skb->mark = sk->sk_mark; |
1196 | |
1197 | if (po->has_vnet_hdr) { |
1198 | if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
1199 | if (!skb_partial_csum_set(skb, vnet_hdr.csum_start, |
1200 | vnet_hdr.csum_offset)) { |
1201 | err = -EINVAL; |
1202 | goto out_free; |
1203 | } |
1204 | } |
1205 | |
1206 | skb_shinfo(skb)->gso_size = vnet_hdr.gso_size; |
1207 | skb_shinfo(skb)->gso_type = gso_type; |
1208 | |
1209 | /* Header must be checked, and gso_segs computed. */ |
1210 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; |
1211 | skb_shinfo(skb)->gso_segs = 0; |
1212 | |
1213 | len += vnet_hdr_len; |
1214 | } |
1215 | |
1216 | /* |
1217 | * Now send it |
1218 | */ |
1219 | |
1220 | err = dev_queue_xmit(skb); |
1221 | if (err > 0 && (err = net_xmit_errno(err)) != 0) |
1222 | goto out_unlock; |
1223 | |
1224 | dev_put(dev); |
1225 | |
1226 | return len; |
1227 | |
1228 | out_free: |
1229 | kfree_skb(skb); |
1230 | out_unlock: |
1231 | if (dev) |
1232 | dev_put(dev); |
1233 | out: |
1234 | return err; |
1235 | } |
1236 | |
1237 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
1238 | struct msghdr *msg, size_t len) |
1239 | { |
1240 | struct sock *sk = sock->sk; |
1241 | struct packet_sock *po = pkt_sk(sk); |
1242 | if (po->tx_ring.pg_vec) |
1243 | return tpacket_snd(po, msg); |
1244 | else |
1245 | return packet_snd(sock, msg, len); |
1246 | } |
1247 | |
1248 | /* |
1249 | * Close a PACKET socket. This is fairly simple. We immediately go |
1250 | * to 'closed' state and remove our protocol entry in the device list. |
1251 | */ |
1252 | |
1253 | static int packet_release(struct socket *sock) |
1254 | { |
1255 | struct sock *sk = sock->sk; |
1256 | struct packet_sock *po; |
1257 | struct net *net; |
1258 | struct tpacket_req req; |
1259 | |
1260 | if (!sk) |
1261 | return 0; |
1262 | |
1263 | net = sock_net(sk); |
1264 | po = pkt_sk(sk); |
1265 | |
1266 | spin_lock_bh(&net->packet.sklist_lock); |
1267 | sk_del_node_init_rcu(sk); |
1268 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
1269 | spin_unlock_bh(&net->packet.sklist_lock); |
1270 | |
1271 | spin_lock(&po->bind_lock); |
1272 | if (po->running) { |
1273 | /* |
1274 | * Remove from protocol table |
1275 | */ |
1276 | po->running = 0; |
1277 | po->num = 0; |
1278 | __dev_remove_pack(&po->prot_hook); |
1279 | __sock_put(sk); |
1280 | } |
1281 | spin_unlock(&po->bind_lock); |
1282 | |
1283 | packet_flush_mclist(sk); |
1284 | |
1285 | memset(&req, 0, sizeof(req)); |
1286 | |
1287 | if (po->rx_ring.pg_vec) |
1288 | packet_set_ring(sk, &req, 1, 0); |
1289 | |
1290 | if (po->tx_ring.pg_vec) |
1291 | packet_set_ring(sk, &req, 1, 1); |
1292 | |
1293 | synchronize_net(); |
1294 | /* |
1295 | * Now the socket is dead. No more input will appear. |
1296 | */ |
1297 | sock_orphan(sk); |
1298 | sock->sk = NULL; |
1299 | |
1300 | /* Purge queues */ |
1301 | |
1302 | skb_queue_purge(&sk->sk_receive_queue); |
1303 | sk_refcnt_debug_release(sk); |
1304 | |
1305 | sock_put(sk); |
1306 | return 0; |
1307 | } |
1308 | |
1309 | /* |
1310 | * Attach a packet hook. |
1311 | */ |
1312 | |
1313 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
1314 | { |
1315 | struct packet_sock *po = pkt_sk(sk); |
1316 | /* |
1317 | * Detach an existing hook if present. |
1318 | */ |
1319 | |
1320 | lock_sock(sk); |
1321 | |
1322 | spin_lock(&po->bind_lock); |
1323 | if (po->running) { |
1324 | __sock_put(sk); |
1325 | po->running = 0; |
1326 | po->num = 0; |
1327 | spin_unlock(&po->bind_lock); |
1328 | dev_remove_pack(&po->prot_hook); |
1329 | spin_lock(&po->bind_lock); |
1330 | } |
1331 | |
1332 | po->num = protocol; |
1333 | po->prot_hook.type = protocol; |
1334 | po->prot_hook.dev = dev; |
1335 | |
1336 | po->ifindex = dev ? dev->ifindex : 0; |
1337 | |
1338 | if (protocol == 0) |
1339 | goto out_unlock; |
1340 | |
1341 | if (!dev || (dev->flags & IFF_UP)) { |
1342 | dev_add_pack(&po->prot_hook); |
1343 | sock_hold(sk); |
1344 | po->running = 1; |
1345 | } else { |
1346 | sk->sk_err = ENETDOWN; |
1347 | if (!sock_flag(sk, SOCK_DEAD)) |
1348 | sk->sk_error_report(sk); |
1349 | } |
1350 | |
1351 | out_unlock: |
1352 | spin_unlock(&po->bind_lock); |
1353 | release_sock(sk); |
1354 | return 0; |
1355 | } |
1356 | |
1357 | /* |
1358 | * Bind a packet socket to a device |
1359 | */ |
1360 | |
1361 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
1362 | int addr_len) |
1363 | { |
1364 | struct sock *sk = sock->sk; |
1365 | char name[15]; |
1366 | struct net_device *dev; |
1367 | int err = -ENODEV; |
1368 | |
1369 | /* |
1370 | * Check legality |
1371 | */ |
1372 | |
1373 | if (addr_len != sizeof(struct sockaddr)) |
1374 | return -EINVAL; |
1375 | strlcpy(name, uaddr->sa_data, sizeof(name)); |
1376 | |
1377 | dev = dev_get_by_name(sock_net(sk), name); |
1378 | if (dev) { |
1379 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); |
1380 | dev_put(dev); |
1381 | } |
1382 | return err; |
1383 | } |
1384 | |
1385 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
1386 | { |
1387 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
1388 | struct sock *sk = sock->sk; |
1389 | struct net_device *dev = NULL; |
1390 | int err; |
1391 | |
1392 | |
1393 | /* |
1394 | * Check legality |
1395 | */ |
1396 | |
1397 | if (addr_len < sizeof(struct sockaddr_ll)) |
1398 | return -EINVAL; |
1399 | if (sll->sll_family != AF_PACKET) |
1400 | return -EINVAL; |
1401 | |
1402 | if (sll->sll_ifindex) { |
1403 | err = -ENODEV; |
1404 | dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex); |
1405 | if (dev == NULL) |
1406 | goto out; |
1407 | } |
1408 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); |
1409 | if (dev) |
1410 | dev_put(dev); |
1411 | |
1412 | out: |
1413 | return err; |
1414 | } |
1415 | |
1416 | static struct proto packet_proto = { |
1417 | .name = "PACKET", |
1418 | .owner = THIS_MODULE, |
1419 | .obj_size = sizeof(struct packet_sock), |
1420 | }; |
1421 | |
1422 | /* |
1423 | * Create a packet of type SOCK_PACKET. |
1424 | */ |
1425 | |
1426 | static int packet_create(struct net *net, struct socket *sock, int protocol, |
1427 | int kern) |
1428 | { |
1429 | struct sock *sk; |
1430 | struct packet_sock *po; |
1431 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1432 | int err; |
1433 | |
1434 | if (!capable(CAP_NET_RAW)) |
1435 | return -EPERM; |
1436 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
1437 | sock->type != SOCK_PACKET) |
1438 | return -ESOCKTNOSUPPORT; |
1439 | |
1440 | sock->state = SS_UNCONNECTED; |
1441 | |
1442 | err = -ENOBUFS; |
1443 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto); |
1444 | if (sk == NULL) |
1445 | goto out; |
1446 | |
1447 | sock->ops = &packet_ops; |
1448 | if (sock->type == SOCK_PACKET) |
1449 | sock->ops = &packet_ops_spkt; |
1450 | |
1451 | sock_init_data(sock, sk); |
1452 | |
1453 | po = pkt_sk(sk); |
1454 | sk->sk_family = PF_PACKET; |
1455 | po->num = proto; |
1456 | |
1457 | sk->sk_destruct = packet_sock_destruct; |
1458 | sk_refcnt_debug_inc(sk); |
1459 | |
1460 | /* |
1461 | * Attach a protocol block |
1462 | */ |
1463 | |
1464 | spin_lock_init(&po->bind_lock); |
1465 | mutex_init(&po->pg_vec_lock); |
1466 | po->prot_hook.func = packet_rcv; |
1467 | |
1468 | if (sock->type == SOCK_PACKET) |
1469 | po->prot_hook.func = packet_rcv_spkt; |
1470 | |
1471 | po->prot_hook.af_packet_priv = sk; |
1472 | |
1473 | if (proto) { |
1474 | po->prot_hook.type = proto; |
1475 | dev_add_pack(&po->prot_hook); |
1476 | sock_hold(sk); |
1477 | po->running = 1; |
1478 | } |
1479 | |
1480 | spin_lock_bh(&net->packet.sklist_lock); |
1481 | sk_add_node_rcu(sk, &net->packet.sklist); |
1482 | sock_prot_inuse_add(net, &packet_proto, 1); |
1483 | spin_unlock_bh(&net->packet.sklist_lock); |
1484 | |
1485 | return 0; |
1486 | out: |
1487 | return err; |
1488 | } |
1489 | |
1490 | /* |
1491 | * Pull a packet from our receive queue and hand it to the user. |
1492 | * If necessary we block. |
1493 | */ |
1494 | |
1495 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, |
1496 | struct msghdr *msg, size_t len, int flags) |
1497 | { |
1498 | struct sock *sk = sock->sk; |
1499 | struct sk_buff *skb; |
1500 | int copied, err; |
1501 | struct sockaddr_ll *sll; |
1502 | int vnet_hdr_len = 0; |
1503 | |
1504 | err = -EINVAL; |
1505 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) |
1506 | goto out; |
1507 | |
1508 | #if 0 |
1509 | /* What error should we return now? EUNATTACH? */ |
1510 | if (pkt_sk(sk)->ifindex < 0) |
1511 | return -ENODEV; |
1512 | #endif |
1513 | |
1514 | /* |
1515 | * Call the generic datagram receiver. This handles all sorts |
1516 | * of horrible races and re-entrancy so we can forget about it |
1517 | * in the protocol layers. |
1518 | * |
1519 | * Now it will return ENETDOWN, if device have just gone down, |
1520 | * but then it will block. |
1521 | */ |
1522 | |
1523 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
1524 | |
1525 | /* |
1526 | * An error occurred so return it. Because skb_recv_datagram() |
1527 | * handles the blocking we don't see and worry about blocking |
1528 | * retries. |
1529 | */ |
1530 | |
1531 | if (skb == NULL) |
1532 | goto out; |
1533 | |
1534 | if (pkt_sk(sk)->has_vnet_hdr) { |
1535 | struct virtio_net_hdr vnet_hdr = { 0 }; |
1536 | |
1537 | err = -EINVAL; |
1538 | vnet_hdr_len = sizeof(vnet_hdr); |
1539 | if ((len -= vnet_hdr_len) < 0) |
1540 | goto out_free; |
1541 | |
1542 | if (skb_is_gso(skb)) { |
1543 | struct skb_shared_info *sinfo = skb_shinfo(skb); |
1544 | |
1545 | /* This is a hint as to how much should be linear. */ |
1546 | vnet_hdr.hdr_len = skb_headlen(skb); |
1547 | vnet_hdr.gso_size = sinfo->gso_size; |
1548 | if (sinfo->gso_type & SKB_GSO_TCPV4) |
1549 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
1550 | else if (sinfo->gso_type & SKB_GSO_TCPV6) |
1551 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
1552 | else if (sinfo->gso_type & SKB_GSO_UDP) |
1553 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
1554 | else if (sinfo->gso_type & SKB_GSO_FCOE) |
1555 | goto out_free; |
1556 | else |
1557 | BUG(); |
1558 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
1559 | vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
1560 | } else |
1561 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
1562 | |
1563 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
1564 | vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
1565 | vnet_hdr.csum_start = skb->csum_start - |
1566 | skb_headroom(skb); |
1567 | vnet_hdr.csum_offset = skb->csum_offset; |
1568 | } /* else everything is zero */ |
1569 | |
1570 | err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr, |
1571 | vnet_hdr_len); |
1572 | if (err < 0) |
1573 | goto out_free; |
1574 | } |
1575 | |
1576 | /* |
1577 | * If the address length field is there to be filled in, we fill |
1578 | * it in now. |
1579 | */ |
1580 | |
1581 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
1582 | if (sock->type == SOCK_PACKET) |
1583 | msg->msg_namelen = sizeof(struct sockaddr_pkt); |
1584 | else |
1585 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); |
1586 | |
1587 | /* |
1588 | * You lose any data beyond the buffer you gave. If it worries a |
1589 | * user program they can ask the device for its MTU anyway. |
1590 | */ |
1591 | |
1592 | copied = skb->len; |
1593 | if (copied > len) { |
1594 | copied = len; |
1595 | msg->msg_flags |= MSG_TRUNC; |
1596 | } |
1597 | |
1598 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
1599 | if (err) |
1600 | goto out_free; |
1601 | |
1602 | sock_recv_ts_and_drops(msg, sk, skb); |
1603 | |
1604 | if (msg->msg_name) |
1605 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
1606 | msg->msg_namelen); |
1607 | |
1608 | if (pkt_sk(sk)->auxdata) { |
1609 | struct tpacket_auxdata aux; |
1610 | |
1611 | aux.tp_status = TP_STATUS_USER; |
1612 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
1613 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; |
1614 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; |
1615 | aux.tp_snaplen = skb->len; |
1616 | aux.tp_mac = 0; |
1617 | aux.tp_net = skb_network_offset(skb); |
1618 | aux.tp_vlan_tci = vlan_tx_tag_get(skb); |
1619 | |
1620 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); |
1621 | } |
1622 | |
1623 | /* |
1624 | * Free or return the buffer as appropriate. Again this |
1625 | * hides all the races and re-entrancy issues from us. |
1626 | */ |
1627 | err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied); |
1628 | |
1629 | out_free: |
1630 | skb_free_datagram(sk, skb); |
1631 | out: |
1632 | return err; |
1633 | } |
1634 | |
1635 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
1636 | int *uaddr_len, int peer) |
1637 | { |
1638 | struct net_device *dev; |
1639 | struct sock *sk = sock->sk; |
1640 | |
1641 | if (peer) |
1642 | return -EOPNOTSUPP; |
1643 | |
1644 | uaddr->sa_family = AF_PACKET; |
1645 | rcu_read_lock(); |
1646 | dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); |
1647 | if (dev) |
1648 | strlcpy(uaddr->sa_data, dev->name, 15); |
1649 | else |
1650 | memset(uaddr->sa_data, 0, 14); |
1651 | rcu_read_unlock(); |
1652 | *uaddr_len = sizeof(*uaddr); |
1653 | |
1654 | return 0; |
1655 | } |
1656 | |
1657 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, |
1658 | int *uaddr_len, int peer) |
1659 | { |
1660 | struct net_device *dev; |
1661 | struct sock *sk = sock->sk; |
1662 | struct packet_sock *po = pkt_sk(sk); |
1663 | DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr); |
1664 | |
1665 | if (peer) |
1666 | return -EOPNOTSUPP; |
1667 | |
1668 | sll->sll_family = AF_PACKET; |
1669 | sll->sll_ifindex = po->ifindex; |
1670 | sll->sll_protocol = po->num; |
1671 | rcu_read_lock(); |
1672 | dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex); |
1673 | if (dev) { |
1674 | sll->sll_hatype = dev->type; |
1675 | sll->sll_halen = dev->addr_len; |
1676 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); |
1677 | } else { |
1678 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ |
1679 | sll->sll_halen = 0; |
1680 | } |
1681 | rcu_read_unlock(); |
1682 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1683 | |
1684 | return 0; |
1685 | } |
1686 | |
1687 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
1688 | int what) |
1689 | { |
1690 | switch (i->type) { |
1691 | case PACKET_MR_MULTICAST: |
1692 | if (i->alen != dev->addr_len) |
1693 | return -EINVAL; |
1694 | if (what > 0) |
1695 | return dev_mc_add(dev, i->addr, i->alen, 0); |
1696 | else |
1697 | return dev_mc_delete(dev, i->addr, i->alen, 0); |
1698 | break; |
1699 | case PACKET_MR_PROMISC: |
1700 | return dev_set_promiscuity(dev, what); |
1701 | break; |
1702 | case PACKET_MR_ALLMULTI: |
1703 | return dev_set_allmulti(dev, what); |
1704 | break; |
1705 | case PACKET_MR_UNICAST: |
1706 | if (i->alen != dev->addr_len) |
1707 | return -EINVAL; |
1708 | if (what > 0) |
1709 | return dev_unicast_add(dev, i->addr); |
1710 | else |
1711 | return dev_unicast_delete(dev, i->addr); |
1712 | break; |
1713 | default: |
1714 | break; |
1715 | } |
1716 | return 0; |
1717 | } |
1718 | |
1719 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) |
1720 | { |
1721 | for ( ; i; i = i->next) { |
1722 | if (i->ifindex == dev->ifindex) |
1723 | packet_dev_mc(dev, i, what); |
1724 | } |
1725 | } |
1726 | |
1727 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1728 | { |
1729 | struct packet_sock *po = pkt_sk(sk); |
1730 | struct packet_mclist *ml, *i; |
1731 | struct net_device *dev; |
1732 | int err; |
1733 | |
1734 | rtnl_lock(); |
1735 | |
1736 | err = -ENODEV; |
1737 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
1738 | if (!dev) |
1739 | goto done; |
1740 | |
1741 | err = -EINVAL; |
1742 | if (mreq->mr_alen > dev->addr_len) |
1743 | goto done; |
1744 | |
1745 | err = -ENOBUFS; |
1746 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1747 | if (i == NULL) |
1748 | goto done; |
1749 | |
1750 | err = 0; |
1751 | for (ml = po->mclist; ml; ml = ml->next) { |
1752 | if (ml->ifindex == mreq->mr_ifindex && |
1753 | ml->type == mreq->mr_type && |
1754 | ml->alen == mreq->mr_alen && |
1755 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { |
1756 | ml->count++; |
1757 | /* Free the new element ... */ |
1758 | kfree(i); |
1759 | goto done; |
1760 | } |
1761 | } |
1762 | |
1763 | i->type = mreq->mr_type; |
1764 | i->ifindex = mreq->mr_ifindex; |
1765 | i->alen = mreq->mr_alen; |
1766 | memcpy(i->addr, mreq->mr_address, i->alen); |
1767 | i->count = 1; |
1768 | i->next = po->mclist; |
1769 | po->mclist = i; |
1770 | err = packet_dev_mc(dev, i, 1); |
1771 | if (err) { |
1772 | po->mclist = i->next; |
1773 | kfree(i); |
1774 | } |
1775 | |
1776 | done: |
1777 | rtnl_unlock(); |
1778 | return err; |
1779 | } |
1780 | |
1781 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1782 | { |
1783 | struct packet_mclist *ml, **mlp; |
1784 | |
1785 | rtnl_lock(); |
1786 | |
1787 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { |
1788 | if (ml->ifindex == mreq->mr_ifindex && |
1789 | ml->type == mreq->mr_type && |
1790 | ml->alen == mreq->mr_alen && |
1791 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { |
1792 | if (--ml->count == 0) { |
1793 | struct net_device *dev; |
1794 | *mlp = ml->next; |
1795 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1796 | if (dev) |
1797 | packet_dev_mc(dev, ml, -1); |
1798 | kfree(ml); |
1799 | } |
1800 | rtnl_unlock(); |
1801 | return 0; |
1802 | } |
1803 | } |
1804 | rtnl_unlock(); |
1805 | return -EADDRNOTAVAIL; |
1806 | } |
1807 | |
1808 | static void packet_flush_mclist(struct sock *sk) |
1809 | { |
1810 | struct packet_sock *po = pkt_sk(sk); |
1811 | struct packet_mclist *ml; |
1812 | |
1813 | if (!po->mclist) |
1814 | return; |
1815 | |
1816 | rtnl_lock(); |
1817 | while ((ml = po->mclist) != NULL) { |
1818 | struct net_device *dev; |
1819 | |
1820 | po->mclist = ml->next; |
1821 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1822 | if (dev != NULL) |
1823 | packet_dev_mc(dev, ml, -1); |
1824 | kfree(ml); |
1825 | } |
1826 | rtnl_unlock(); |
1827 | } |
1828 | |
1829 | static int |
1830 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
1831 | { |
1832 | struct sock *sk = sock->sk; |
1833 | struct packet_sock *po = pkt_sk(sk); |
1834 | int ret; |
1835 | |
1836 | if (level != SOL_PACKET) |
1837 | return -ENOPROTOOPT; |
1838 | |
1839 | switch (optname) { |
1840 | case PACKET_ADD_MEMBERSHIP: |
1841 | case PACKET_DROP_MEMBERSHIP: |
1842 | { |
1843 | struct packet_mreq_max mreq; |
1844 | int len = optlen; |
1845 | memset(&mreq, 0, sizeof(mreq)); |
1846 | if (len < sizeof(struct packet_mreq)) |
1847 | return -EINVAL; |
1848 | if (len > sizeof(mreq)) |
1849 | len = sizeof(mreq); |
1850 | if (copy_from_user(&mreq, optval, len)) |
1851 | return -EFAULT; |
1852 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
1853 | return -EINVAL; |
1854 | if (optname == PACKET_ADD_MEMBERSHIP) |
1855 | ret = packet_mc_add(sk, &mreq); |
1856 | else |
1857 | ret = packet_mc_drop(sk, &mreq); |
1858 | return ret; |
1859 | } |
1860 | |
1861 | case PACKET_RX_RING: |
1862 | case PACKET_TX_RING: |
1863 | { |
1864 | struct tpacket_req req; |
1865 | |
1866 | if (optlen < sizeof(req)) |
1867 | return -EINVAL; |
1868 | if (pkt_sk(sk)->has_vnet_hdr) |
1869 | return -EINVAL; |
1870 | if (copy_from_user(&req, optval, sizeof(req))) |
1871 | return -EFAULT; |
1872 | return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING); |
1873 | } |
1874 | case PACKET_COPY_THRESH: |
1875 | { |
1876 | int val; |
1877 | |
1878 | if (optlen != sizeof(val)) |
1879 | return -EINVAL; |
1880 | if (copy_from_user(&val, optval, sizeof(val))) |
1881 | return -EFAULT; |
1882 | |
1883 | pkt_sk(sk)->copy_thresh = val; |
1884 | return 0; |
1885 | } |
1886 | case PACKET_VERSION: |
1887 | { |
1888 | int val; |
1889 | |
1890 | if (optlen != sizeof(val)) |
1891 | return -EINVAL; |
1892 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
1893 | return -EBUSY; |
1894 | if (copy_from_user(&val, optval, sizeof(val))) |
1895 | return -EFAULT; |
1896 | switch (val) { |
1897 | case TPACKET_V1: |
1898 | case TPACKET_V2: |
1899 | po->tp_version = val; |
1900 | return 0; |
1901 | default: |
1902 | return -EINVAL; |
1903 | } |
1904 | } |
1905 | case PACKET_RESERVE: |
1906 | { |
1907 | unsigned int val; |
1908 | |
1909 | if (optlen != sizeof(val)) |
1910 | return -EINVAL; |
1911 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
1912 | return -EBUSY; |
1913 | if (copy_from_user(&val, optval, sizeof(val))) |
1914 | return -EFAULT; |
1915 | po->tp_reserve = val; |
1916 | return 0; |
1917 | } |
1918 | case PACKET_LOSS: |
1919 | { |
1920 | unsigned int val; |
1921 | |
1922 | if (optlen != sizeof(val)) |
1923 | return -EINVAL; |
1924 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
1925 | return -EBUSY; |
1926 | if (copy_from_user(&val, optval, sizeof(val))) |
1927 | return -EFAULT; |
1928 | po->tp_loss = !!val; |
1929 | return 0; |
1930 | } |
1931 | case PACKET_AUXDATA: |
1932 | { |
1933 | int val; |
1934 | |
1935 | if (optlen < sizeof(val)) |
1936 | return -EINVAL; |
1937 | if (copy_from_user(&val, optval, sizeof(val))) |
1938 | return -EFAULT; |
1939 | |
1940 | po->auxdata = !!val; |
1941 | return 0; |
1942 | } |
1943 | case PACKET_ORIGDEV: |
1944 | { |
1945 | int val; |
1946 | |
1947 | if (optlen < sizeof(val)) |
1948 | return -EINVAL; |
1949 | if (copy_from_user(&val, optval, sizeof(val))) |
1950 | return -EFAULT; |
1951 | |
1952 | po->origdev = !!val; |
1953 | return 0; |
1954 | } |
1955 | case PACKET_VNET_HDR: |
1956 | { |
1957 | int val; |
1958 | |
1959 | if (sock->type != SOCK_RAW) |
1960 | return -EINVAL; |
1961 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
1962 | return -EBUSY; |
1963 | if (optlen < sizeof(val)) |
1964 | return -EINVAL; |
1965 | if (copy_from_user(&val, optval, sizeof(val))) |
1966 | return -EFAULT; |
1967 | |
1968 | po->has_vnet_hdr = !!val; |
1969 | return 0; |
1970 | } |
1971 | default: |
1972 | return -ENOPROTOOPT; |
1973 | } |
1974 | } |
1975 | |
1976 | static int packet_getsockopt(struct socket *sock, int level, int optname, |
1977 | char __user *optval, int __user *optlen) |
1978 | { |
1979 | int len; |
1980 | int val; |
1981 | struct sock *sk = sock->sk; |
1982 | struct packet_sock *po = pkt_sk(sk); |
1983 | void *data; |
1984 | struct tpacket_stats st; |
1985 | |
1986 | if (level != SOL_PACKET) |
1987 | return -ENOPROTOOPT; |
1988 | |
1989 | if (get_user(len, optlen)) |
1990 | return -EFAULT; |
1991 | |
1992 | if (len < 0) |
1993 | return -EINVAL; |
1994 | |
1995 | switch (optname) { |
1996 | case PACKET_STATISTICS: |
1997 | if (len > sizeof(struct tpacket_stats)) |
1998 | len = sizeof(struct tpacket_stats); |
1999 | spin_lock_bh(&sk->sk_receive_queue.lock); |
2000 | st = po->stats; |
2001 | memset(&po->stats, 0, sizeof(st)); |
2002 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
2003 | st.tp_packets += st.tp_drops; |
2004 | |
2005 | data = &st; |
2006 | break; |
2007 | case PACKET_AUXDATA: |
2008 | if (len > sizeof(int)) |
2009 | len = sizeof(int); |
2010 | val = po->auxdata; |
2011 | |
2012 | data = &val; |
2013 | break; |
2014 | case PACKET_ORIGDEV: |
2015 | if (len > sizeof(int)) |
2016 | len = sizeof(int); |
2017 | val = po->origdev; |
2018 | |
2019 | data = &val; |
2020 | break; |
2021 | case PACKET_VNET_HDR: |
2022 | if (len > sizeof(int)) |
2023 | len = sizeof(int); |
2024 | val = po->has_vnet_hdr; |
2025 | |
2026 | data = &val; |
2027 | break; |
2028 | case PACKET_VERSION: |
2029 | if (len > sizeof(int)) |
2030 | len = sizeof(int); |
2031 | val = po->tp_version; |
2032 | data = &val; |
2033 | break; |
2034 | case PACKET_HDRLEN: |
2035 | if (len > sizeof(int)) |
2036 | len = sizeof(int); |
2037 | if (copy_from_user(&val, optval, len)) |
2038 | return -EFAULT; |
2039 | switch (val) { |
2040 | case TPACKET_V1: |
2041 | val = sizeof(struct tpacket_hdr); |
2042 | break; |
2043 | case TPACKET_V2: |
2044 | val = sizeof(struct tpacket2_hdr); |
2045 | break; |
2046 | default: |
2047 | return -EINVAL; |
2048 | } |
2049 | data = &val; |
2050 | break; |
2051 | case PACKET_RESERVE: |
2052 | if (len > sizeof(unsigned int)) |
2053 | len = sizeof(unsigned int); |
2054 | val = po->tp_reserve; |
2055 | data = &val; |
2056 | break; |
2057 | case PACKET_LOSS: |
2058 | if (len > sizeof(unsigned int)) |
2059 | len = sizeof(unsigned int); |
2060 | val = po->tp_loss; |
2061 | data = &val; |
2062 | break; |
2063 | default: |
2064 | return -ENOPROTOOPT; |
2065 | } |
2066 | |
2067 | if (put_user(len, optlen)) |
2068 | return -EFAULT; |
2069 | if (copy_to_user(optval, data, len)) |
2070 | return -EFAULT; |
2071 | return 0; |
2072 | } |
2073 | |
2074 | |
2075 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) |
2076 | { |
2077 | struct sock *sk; |
2078 | struct hlist_node *node; |
2079 | struct net_device *dev = data; |
2080 | struct net *net = dev_net(dev); |
2081 | |
2082 | rcu_read_lock(); |
2083 | sk_for_each_rcu(sk, node, &net->packet.sklist) { |
2084 | struct packet_sock *po = pkt_sk(sk); |
2085 | |
2086 | switch (msg) { |
2087 | case NETDEV_UNREGISTER: |
2088 | if (po->mclist) |
2089 | packet_dev_mclist(dev, po->mclist, -1); |
2090 | /* fallthrough */ |
2091 | |
2092 | case NETDEV_DOWN: |
2093 | if (dev->ifindex == po->ifindex) { |
2094 | spin_lock(&po->bind_lock); |
2095 | if (po->running) { |
2096 | __dev_remove_pack(&po->prot_hook); |
2097 | __sock_put(sk); |
2098 | po->running = 0; |
2099 | sk->sk_err = ENETDOWN; |
2100 | if (!sock_flag(sk, SOCK_DEAD)) |
2101 | sk->sk_error_report(sk); |
2102 | } |
2103 | if (msg == NETDEV_UNREGISTER) { |
2104 | po->ifindex = -1; |
2105 | po->prot_hook.dev = NULL; |
2106 | } |
2107 | spin_unlock(&po->bind_lock); |
2108 | } |
2109 | break; |
2110 | case NETDEV_UP: |
2111 | if (dev->ifindex == po->ifindex) { |
2112 | spin_lock(&po->bind_lock); |
2113 | if (po->num && !po->running) { |
2114 | dev_add_pack(&po->prot_hook); |
2115 | sock_hold(sk); |
2116 | po->running = 1; |
2117 | } |
2118 | spin_unlock(&po->bind_lock); |
2119 | } |
2120 | break; |
2121 | } |
2122 | } |
2123 | rcu_read_unlock(); |
2124 | return NOTIFY_DONE; |
2125 | } |
2126 | |
2127 | |
2128 | static int packet_ioctl(struct socket *sock, unsigned int cmd, |
2129 | unsigned long arg) |
2130 | { |
2131 | struct sock *sk = sock->sk; |
2132 | |
2133 | switch (cmd) { |
2134 | case SIOCOUTQ: |
2135 | { |
2136 | int amount = sk_wmem_alloc_get(sk); |
2137 | |
2138 | return put_user(amount, (int __user *)arg); |
2139 | } |
2140 | case SIOCINQ: |
2141 | { |
2142 | struct sk_buff *skb; |
2143 | int amount = 0; |
2144 | |
2145 | spin_lock_bh(&sk->sk_receive_queue.lock); |
2146 | skb = skb_peek(&sk->sk_receive_queue); |
2147 | if (skb) |
2148 | amount = skb->len; |
2149 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
2150 | return put_user(amount, (int __user *)arg); |
2151 | } |
2152 | case SIOCGSTAMP: |
2153 | return sock_get_timestamp(sk, (struct timeval __user *)arg); |
2154 | case SIOCGSTAMPNS: |
2155 | return sock_get_timestampns(sk, (struct timespec __user *)arg); |
2156 | |
2157 | #ifdef CONFIG_INET |
2158 | case SIOCADDRT: |
2159 | case SIOCDELRT: |
2160 | case SIOCDARP: |
2161 | case SIOCGARP: |
2162 | case SIOCSARP: |
2163 | case SIOCGIFADDR: |
2164 | case SIOCSIFADDR: |
2165 | case SIOCGIFBRDADDR: |
2166 | case SIOCSIFBRDADDR: |
2167 | case SIOCGIFNETMASK: |
2168 | case SIOCSIFNETMASK: |
2169 | case SIOCGIFDSTADDR: |
2170 | case SIOCSIFDSTADDR: |
2171 | case SIOCSIFFLAGS: |
2172 | return inet_dgram_ops.ioctl(sock, cmd, arg); |
2173 | #endif |
2174 | |
2175 | default: |
2176 | return -ENOIOCTLCMD; |
2177 | } |
2178 | return 0; |
2179 | } |
2180 | |
2181 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
2182 | poll_table *wait) |
2183 | { |
2184 | struct sock *sk = sock->sk; |
2185 | struct packet_sock *po = pkt_sk(sk); |
2186 | unsigned int mask = datagram_poll(file, sock, wait); |
2187 | |
2188 | spin_lock_bh(&sk->sk_receive_queue.lock); |
2189 | if (po->rx_ring.pg_vec) { |
2190 | if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL)) |
2191 | mask |= POLLIN | POLLRDNORM; |
2192 | } |
2193 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
2194 | spin_lock_bh(&sk->sk_write_queue.lock); |
2195 | if (po->tx_ring.pg_vec) { |
2196 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) |
2197 | mask |= POLLOUT | POLLWRNORM; |
2198 | } |
2199 | spin_unlock_bh(&sk->sk_write_queue.lock); |
2200 | return mask; |
2201 | } |
2202 | |
2203 | |
2204 | /* Dirty? Well, I still did not learn better way to account |
2205 | * for user mmaps. |
2206 | */ |
2207 | |
2208 | static void packet_mm_open(struct vm_area_struct *vma) |
2209 | { |
2210 | struct file *file = vma->vm_file; |
2211 | struct socket *sock = file->private_data; |
2212 | struct sock *sk = sock->sk; |
2213 | |
2214 | if (sk) |
2215 | atomic_inc(&pkt_sk(sk)->mapped); |
2216 | } |
2217 | |
2218 | static void packet_mm_close(struct vm_area_struct *vma) |
2219 | { |
2220 | struct file *file = vma->vm_file; |
2221 | struct socket *sock = file->private_data; |
2222 | struct sock *sk = sock->sk; |
2223 | |
2224 | if (sk) |
2225 | atomic_dec(&pkt_sk(sk)->mapped); |
2226 | } |
2227 | |
2228 | static const struct vm_operations_struct packet_mmap_ops = { |
2229 | .open = packet_mm_open, |
2230 | .close = packet_mm_close, |
2231 | }; |
2232 | |
2233 | static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len) |
2234 | { |
2235 | int i; |
2236 | |
2237 | for (i = 0; i < len; i++) { |
2238 | if (likely(pg_vec[i])) |
2239 | free_pages((unsigned long) pg_vec[i], order); |
2240 | } |
2241 | kfree(pg_vec); |
2242 | } |
2243 | |
2244 | static inline char *alloc_one_pg_vec_page(unsigned long order) |
2245 | { |
2246 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN; |
2247 | |
2248 | return (char *) __get_free_pages(gfp_flags, order); |
2249 | } |
2250 | |
2251 | static char **alloc_pg_vec(struct tpacket_req *req, int order) |
2252 | { |
2253 | unsigned int block_nr = req->tp_block_nr; |
2254 | char **pg_vec; |
2255 | int i; |
2256 | |
2257 | pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL); |
2258 | if (unlikely(!pg_vec)) |
2259 | goto out; |
2260 | |
2261 | for (i = 0; i < block_nr; i++) { |
2262 | pg_vec[i] = alloc_one_pg_vec_page(order); |
2263 | if (unlikely(!pg_vec[i])) |
2264 | goto out_free_pgvec; |
2265 | } |
2266 | |
2267 | out: |
2268 | return pg_vec; |
2269 | |
2270 | out_free_pgvec: |
2271 | free_pg_vec(pg_vec, order, block_nr); |
2272 | pg_vec = NULL; |
2273 | goto out; |
2274 | } |
2275 | |
2276 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
2277 | int closing, int tx_ring) |
2278 | { |
2279 | char **pg_vec = NULL; |
2280 | struct packet_sock *po = pkt_sk(sk); |
2281 | int was_running, order = 0; |
2282 | struct packet_ring_buffer *rb; |
2283 | struct sk_buff_head *rb_queue; |
2284 | __be16 num; |
2285 | int err; |
2286 | |
2287 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
2288 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; |
2289 | |
2290 | err = -EBUSY; |
2291 | if (!closing) { |
2292 | if (atomic_read(&po->mapped)) |
2293 | goto out; |
2294 | if (atomic_read(&rb->pending)) |
2295 | goto out; |
2296 | } |
2297 | |
2298 | if (req->tp_block_nr) { |
2299 | /* Sanity tests and some calculations */ |
2300 | err = -EBUSY; |
2301 | if (unlikely(rb->pg_vec)) |
2302 | goto out; |
2303 | |
2304 | switch (po->tp_version) { |
2305 | case TPACKET_V1: |
2306 | po->tp_hdrlen = TPACKET_HDRLEN; |
2307 | break; |
2308 | case TPACKET_V2: |
2309 | po->tp_hdrlen = TPACKET2_HDRLEN; |
2310 | break; |
2311 | } |
2312 | |
2313 | err = -EINVAL; |
2314 | if (unlikely((int)req->tp_block_size <= 0)) |
2315 | goto out; |
2316 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
2317 | goto out; |
2318 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
2319 | po->tp_reserve)) |
2320 | goto out; |
2321 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
2322 | goto out; |
2323 | |
2324 | rb->frames_per_block = req->tp_block_size/req->tp_frame_size; |
2325 | if (unlikely(rb->frames_per_block <= 0)) |
2326 | goto out; |
2327 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != |
2328 | req->tp_frame_nr)) |
2329 | goto out; |
2330 | |
2331 | err = -ENOMEM; |
2332 | order = get_order(req->tp_block_size); |
2333 | pg_vec = alloc_pg_vec(req, order); |
2334 | if (unlikely(!pg_vec)) |
2335 | goto out; |
2336 | } |
2337 | /* Done */ |
2338 | else { |
2339 | err = -EINVAL; |
2340 | if (unlikely(req->tp_frame_nr)) |
2341 | goto out; |
2342 | } |
2343 | |
2344 | lock_sock(sk); |
2345 | |
2346 | /* Detach socket from network */ |
2347 | spin_lock(&po->bind_lock); |
2348 | was_running = po->running; |
2349 | num = po->num; |
2350 | if (was_running) { |
2351 | __dev_remove_pack(&po->prot_hook); |
2352 | po->num = 0; |
2353 | po->running = 0; |
2354 | __sock_put(sk); |
2355 | } |
2356 | spin_unlock(&po->bind_lock); |
2357 | |
2358 | synchronize_net(); |
2359 | |
2360 | err = -EBUSY; |
2361 | mutex_lock(&po->pg_vec_lock); |
2362 | if (closing || atomic_read(&po->mapped) == 0) { |
2363 | err = 0; |
2364 | #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) |
2365 | spin_lock_bh(&rb_queue->lock); |
2366 | pg_vec = XC(rb->pg_vec, pg_vec); |
2367 | rb->frame_max = (req->tp_frame_nr - 1); |
2368 | rb->head = 0; |
2369 | rb->frame_size = req->tp_frame_size; |
2370 | spin_unlock_bh(&rb_queue->lock); |
2371 | |
2372 | order = XC(rb->pg_vec_order, order); |
2373 | req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr); |
2374 | |
2375 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; |
2376 | po->prot_hook.func = (po->rx_ring.pg_vec) ? |
2377 | tpacket_rcv : packet_rcv; |
2378 | skb_queue_purge(rb_queue); |
2379 | #undef XC |
2380 | if (atomic_read(&po->mapped)) |
2381 | pr_err("packet_mmap: vma is busy: %d\n", |
2382 | atomic_read(&po->mapped)); |
2383 | } |
2384 | mutex_unlock(&po->pg_vec_lock); |
2385 | |
2386 | spin_lock(&po->bind_lock); |
2387 | if (was_running && !po->running) { |
2388 | sock_hold(sk); |
2389 | po->running = 1; |
2390 | po->num = num; |
2391 | dev_add_pack(&po->prot_hook); |
2392 | } |
2393 | spin_unlock(&po->bind_lock); |
2394 | |
2395 | release_sock(sk); |
2396 | |
2397 | if (pg_vec) |
2398 | free_pg_vec(pg_vec, order, req->tp_block_nr); |
2399 | out: |
2400 | return err; |
2401 | } |
2402 | |
2403 | static int packet_mmap(struct file *file, struct socket *sock, |
2404 | struct vm_area_struct *vma) |
2405 | { |
2406 | struct sock *sk = sock->sk; |
2407 | struct packet_sock *po = pkt_sk(sk); |
2408 | unsigned long size, expected_size; |
2409 | struct packet_ring_buffer *rb; |
2410 | unsigned long start; |
2411 | int err = -EINVAL; |
2412 | int i; |
2413 | |
2414 | if (vma->vm_pgoff) |
2415 | return -EINVAL; |
2416 | |
2417 | mutex_lock(&po->pg_vec_lock); |
2418 | |
2419 | expected_size = 0; |
2420 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
2421 | if (rb->pg_vec) { |
2422 | expected_size += rb->pg_vec_len |
2423 | * rb->pg_vec_pages |
2424 | * PAGE_SIZE; |
2425 | } |
2426 | } |
2427 | |
2428 | if (expected_size == 0) |
2429 | goto out; |
2430 | |
2431 | size = vma->vm_end - vma->vm_start; |
2432 | if (size != expected_size) |
2433 | goto out; |
2434 | |
2435 | start = vma->vm_start; |
2436 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
2437 | if (rb->pg_vec == NULL) |
2438 | continue; |
2439 | |
2440 | for (i = 0; i < rb->pg_vec_len; i++) { |
2441 | struct page *page = virt_to_page(rb->pg_vec[i]); |
2442 | int pg_num; |
2443 | |
2444 | for (pg_num = 0; pg_num < rb->pg_vec_pages; |
2445 | pg_num++, page++) { |
2446 | err = vm_insert_page(vma, start, page); |
2447 | if (unlikely(err)) |
2448 | goto out; |
2449 | start += PAGE_SIZE; |
2450 | } |
2451 | } |
2452 | } |
2453 | |
2454 | atomic_inc(&po->mapped); |
2455 | vma->vm_ops = &packet_mmap_ops; |
2456 | err = 0; |
2457 | |
2458 | out: |
2459 | mutex_unlock(&po->pg_vec_lock); |
2460 | return err; |
2461 | } |
2462 | |
2463 | static const struct proto_ops packet_ops_spkt = { |
2464 | .family = PF_PACKET, |
2465 | .owner = THIS_MODULE, |
2466 | .release = packet_release, |
2467 | .bind = packet_bind_spkt, |
2468 | .connect = sock_no_connect, |
2469 | .socketpair = sock_no_socketpair, |
2470 | .accept = sock_no_accept, |
2471 | .getname = packet_getname_spkt, |
2472 | .poll = datagram_poll, |
2473 | .ioctl = packet_ioctl, |
2474 | .listen = sock_no_listen, |
2475 | .shutdown = sock_no_shutdown, |
2476 | .setsockopt = sock_no_setsockopt, |
2477 | .getsockopt = sock_no_getsockopt, |
2478 | .sendmsg = packet_sendmsg_spkt, |
2479 | .recvmsg = packet_recvmsg, |
2480 | .mmap = sock_no_mmap, |
2481 | .sendpage = sock_no_sendpage, |
2482 | }; |
2483 | |
2484 | static const struct proto_ops packet_ops = { |
2485 | .family = PF_PACKET, |
2486 | .owner = THIS_MODULE, |
2487 | .release = packet_release, |
2488 | .bind = packet_bind, |
2489 | .connect = sock_no_connect, |
2490 | .socketpair = sock_no_socketpair, |
2491 | .accept = sock_no_accept, |
2492 | .getname = packet_getname, |
2493 | .poll = packet_poll, |
2494 | .ioctl = packet_ioctl, |
2495 | .listen = sock_no_listen, |
2496 | .shutdown = sock_no_shutdown, |
2497 | .setsockopt = packet_setsockopt, |
2498 | .getsockopt = packet_getsockopt, |
2499 | .sendmsg = packet_sendmsg, |
2500 | .recvmsg = packet_recvmsg, |
2501 | .mmap = packet_mmap, |
2502 | .sendpage = sock_no_sendpage, |
2503 | }; |
2504 | |
2505 | static const struct net_proto_family packet_family_ops = { |
2506 | .family = PF_PACKET, |
2507 | .create = packet_create, |
2508 | .owner = THIS_MODULE, |
2509 | }; |
2510 | |
2511 | static struct notifier_block packet_netdev_notifier = { |
2512 | .notifier_call = packet_notifier, |
2513 | }; |
2514 | |
2515 | #ifdef CONFIG_PROC_FS |
2516 | |
2517 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) |
2518 | __acquires(RCU) |
2519 | { |
2520 | struct net *net = seq_file_net(seq); |
2521 | |
2522 | rcu_read_lock(); |
2523 | return seq_hlist_start_head_rcu(&net->packet.sklist, *pos); |
2524 | } |
2525 | |
2526 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
2527 | { |
2528 | struct net *net = seq_file_net(seq); |
2529 | return seq_hlist_next_rcu(v, &net->packet.sklist, pos); |
2530 | } |
2531 | |
2532 | static void packet_seq_stop(struct seq_file *seq, void *v) |
2533 | __releases(RCU) |
2534 | { |
2535 | rcu_read_unlock(); |
2536 | } |
2537 | |
2538 | static int packet_seq_show(struct seq_file *seq, void *v) |
2539 | { |
2540 | if (v == SEQ_START_TOKEN) |
2541 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); |
2542 | else { |
2543 | struct sock *s = sk_entry(v); |
2544 | const struct packet_sock *po = pkt_sk(s); |
2545 | |
2546 | seq_printf(seq, |
2547 | "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", |
2548 | s, |
2549 | atomic_read(&s->sk_refcnt), |
2550 | s->sk_type, |
2551 | ntohs(po->num), |
2552 | po->ifindex, |
2553 | po->running, |
2554 | atomic_read(&s->sk_rmem_alloc), |
2555 | sock_i_uid(s), |
2556 | sock_i_ino(s)); |
2557 | } |
2558 | |
2559 | return 0; |
2560 | } |
2561 | |
2562 | static const struct seq_operations packet_seq_ops = { |
2563 | .start = packet_seq_start, |
2564 | .next = packet_seq_next, |
2565 | .stop = packet_seq_stop, |
2566 | .show = packet_seq_show, |
2567 | }; |
2568 | |
2569 | static int packet_seq_open(struct inode *inode, struct file *file) |
2570 | { |
2571 | return seq_open_net(inode, file, &packet_seq_ops, |
2572 | sizeof(struct seq_net_private)); |
2573 | } |
2574 | |
2575 | static const struct file_operations packet_seq_fops = { |
2576 | .owner = THIS_MODULE, |
2577 | .open = packet_seq_open, |
2578 | .read = seq_read, |
2579 | .llseek = seq_lseek, |
2580 | .release = seq_release_net, |
2581 | }; |
2582 | |
2583 | #endif |
2584 | |
2585 | static int __net_init packet_net_init(struct net *net) |
2586 | { |
2587 | spin_lock_init(&net->packet.sklist_lock); |
2588 | INIT_HLIST_HEAD(&net->packet.sklist); |
2589 | |
2590 | if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops)) |
2591 | return -ENOMEM; |
2592 | |
2593 | return 0; |
2594 | } |
2595 | |
2596 | static void __net_exit packet_net_exit(struct net *net) |
2597 | { |
2598 | proc_net_remove(net, "packet"); |
2599 | } |
2600 | |
2601 | static struct pernet_operations packet_net_ops = { |
2602 | .init = packet_net_init, |
2603 | .exit = packet_net_exit, |
2604 | }; |
2605 | |
2606 | |
2607 | static void __exit packet_exit(void) |
2608 | { |
2609 | unregister_netdevice_notifier(&packet_netdev_notifier); |
2610 | unregister_pernet_subsys(&packet_net_ops); |
2611 | sock_unregister(PF_PACKET); |
2612 | proto_unregister(&packet_proto); |
2613 | } |
2614 | |
2615 | static int __init packet_init(void) |
2616 | { |
2617 | int rc = proto_register(&packet_proto, 0); |
2618 | |
2619 | if (rc != 0) |
2620 | goto out; |
2621 | |
2622 | sock_register(&packet_family_ops); |
2623 | register_pernet_subsys(&packet_net_ops); |
2624 | register_netdevice_notifier(&packet_netdev_notifier); |
2625 | out: |
2626 | return rc; |
2627 | } |
2628 | |
2629 | module_init(packet_init); |
2630 | module_exit(packet_exit); |
2631 | MODULE_LICENSE("GPL"); |
2632 | MODULE_ALIAS_NETPROTO(PF_PACKET); |
2633 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9