Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * PACKET - implements raw packet sockets. | |
7 | * | |
8 | * Version: $Id: af_packet.c,v 1.61 2002/02/08 03:57:19 davem Exp $ | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
13 | * | |
1ce4f28b | 14 | * Fixes: |
1da177e4 LT |
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. | |
1ce4f28b | 37 | * Ulises Alonso : Frame number limit removal and |
1da177e4 | 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 | |
1ce4f28b | 42 | * byte arrays at the end of sockaddr_ll |
0fb375fb | 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 | */ | |
1ce4f28b | 51 | |
1da177e4 | 52 | #include <linux/types.h> |
1da177e4 | 53 | #include <linux/mm.h> |
4fc268d2 | 54 | #include <linux/capability.h> |
1da177e4 LT |
55 | #include <linux/fcntl.h> |
56 | #include <linux/socket.h> | |
57 | #include <linux/in.h> | |
58 | #include <linux/inet.h> | |
59 | #include <linux/netdevice.h> | |
60 | #include <linux/if_packet.h> | |
61 | #include <linux/wireless.h> | |
ffbc6111 | 62 | #include <linux/kernel.h> |
1da177e4 LT |
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 | ||
1da177e4 LT |
86 | /* |
87 | Assumptions: | |
88 | - if device has no dev->hard_header routine, it adds and removes ll header | |
89 | inside itself. In this case ll header is invisible outside of device, | |
90 | but higher levels still should reserve dev->hard_header_len. | |
91 | Some devices are enough clever to reallocate skb, when header | |
92 | will not fit to reserved space (tunnel), another ones are silly | |
93 | (PPP). | |
94 | - packet socket receives packets with pulled ll header, | |
95 | so that SOCK_RAW should push it back. | |
96 | ||
97 | On receive: | |
98 | ----------- | |
99 | ||
100 | Incoming, dev->hard_header!=NULL | |
b0e380b1 ACM |
101 | mac_header -> ll header |
102 | data -> data | |
1da177e4 LT |
103 | |
104 | Outgoing, dev->hard_header!=NULL | |
b0e380b1 ACM |
105 | mac_header -> ll header |
106 | data -> ll header | |
1da177e4 LT |
107 | |
108 | Incoming, dev->hard_header==NULL | |
b0e380b1 ACM |
109 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
110 | header. PPP makes it, that is wrong, because introduce | |
db0c58f9 | 111 | assymetry between rx and tx paths. |
b0e380b1 | 112 | data -> data |
1da177e4 LT |
113 | |
114 | Outgoing, dev->hard_header==NULL | |
b0e380b1 ACM |
115 | mac_header -> data. ll header is still not built! |
116 | data -> data | |
1da177e4 LT |
117 | |
118 | Resume | |
119 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. | |
120 | ||
121 | ||
122 | On transmit: | |
123 | ------------ | |
124 | ||
125 | dev->hard_header != NULL | |
b0e380b1 ACM |
126 | mac_header -> ll header |
127 | data -> ll header | |
1da177e4 LT |
128 | |
129 | dev->hard_header == NULL (ll header is added by device, we cannot control it) | |
b0e380b1 ACM |
130 | mac_header -> data |
131 | data -> data | |
1da177e4 LT |
132 | |
133 | We should set nh.raw on output to correct posistion, | |
134 | packet classifier depends on it. | |
135 | */ | |
136 | ||
137 | /* List of all packet sockets. */ | |
138 | static HLIST_HEAD(packet_sklist); | |
139 | static DEFINE_RWLOCK(packet_sklist_lock); | |
140 | ||
141 | static atomic_t packet_socks_nr; | |
142 | ||
143 | ||
144 | /* Private packet socket structures. */ | |
145 | ||
1da177e4 LT |
146 | struct packet_mclist |
147 | { | |
148 | struct packet_mclist *next; | |
149 | int ifindex; | |
150 | int count; | |
151 | unsigned short type; | |
152 | unsigned short alen; | |
0fb375fb EB |
153 | unsigned char addr[MAX_ADDR_LEN]; |
154 | }; | |
155 | /* identical to struct packet_mreq except it has | |
156 | * a longer address field. | |
157 | */ | |
158 | struct packet_mreq_max | |
159 | { | |
160 | int mr_ifindex; | |
161 | unsigned short mr_type; | |
162 | unsigned short mr_alen; | |
163 | unsigned char mr_address[MAX_ADDR_LEN]; | |
1da177e4 | 164 | }; |
a2efcfa0 | 165 | |
1da177e4 LT |
166 | #ifdef CONFIG_PACKET_MMAP |
167 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing); | |
168 | #endif | |
169 | ||
170 | static void packet_flush_mclist(struct sock *sk); | |
171 | ||
172 | struct packet_sock { | |
173 | /* struct sock has to be the first member of packet_sock */ | |
174 | struct sock sk; | |
175 | struct tpacket_stats stats; | |
176 | #ifdef CONFIG_PACKET_MMAP | |
177 | char * *pg_vec; | |
178 | unsigned int head; | |
179 | unsigned int frames_per_block; | |
180 | unsigned int frame_size; | |
181 | unsigned int frame_max; | |
182 | int copy_thresh; | |
183 | #endif | |
184 | struct packet_type prot_hook; | |
185 | spinlock_t bind_lock; | |
8dc41944 | 186 | unsigned int running:1, /* prot_hook is attached*/ |
80feaacb PWJ |
187 | auxdata:1, |
188 | origdev:1; | |
1da177e4 | 189 | int ifindex; /* bound device */ |
0e11c91e | 190 | __be16 num; |
1da177e4 | 191 | struct packet_mclist *mclist; |
1da177e4 LT |
192 | #ifdef CONFIG_PACKET_MMAP |
193 | atomic_t mapped; | |
194 | unsigned int pg_vec_order; | |
195 | unsigned int pg_vec_pages; | |
196 | unsigned int pg_vec_len; | |
197 | #endif | |
198 | }; | |
199 | ||
ffbc6111 HX |
200 | struct packet_skb_cb { |
201 | unsigned int origlen; | |
202 | union { | |
203 | struct sockaddr_pkt pkt; | |
204 | struct sockaddr_ll ll; | |
205 | } sa; | |
206 | }; | |
207 | ||
208 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) | |
8dc41944 | 209 | |
1da177e4 LT |
210 | #ifdef CONFIG_PACKET_MMAP |
211 | ||
ad930650 | 212 | static inline struct tpacket_hdr *packet_lookup_frame(struct packet_sock *po, unsigned int position) |
1da177e4 LT |
213 | { |
214 | unsigned int pg_vec_pos, frame_offset; | |
1da177e4 LT |
215 | |
216 | pg_vec_pos = position / po->frames_per_block; | |
217 | frame_offset = position % po->frames_per_block; | |
218 | ||
ad930650 | 219 | return (struct tpacket_hdr *)(po->pg_vec[pg_vec_pos] + (frame_offset * po->frame_size)); |
1da177e4 LT |
220 | } |
221 | #endif | |
222 | ||
223 | static inline struct packet_sock *pkt_sk(struct sock *sk) | |
224 | { | |
225 | return (struct packet_sock *)sk; | |
226 | } | |
227 | ||
228 | static void packet_sock_destruct(struct sock *sk) | |
229 | { | |
230 | BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); | |
231 | BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); | |
232 | ||
233 | if (!sock_flag(sk, SOCK_DEAD)) { | |
234 | printk("Attempt to release alive packet socket: %p\n", sk); | |
235 | return; | |
236 | } | |
237 | ||
238 | atomic_dec(&packet_socks_nr); | |
239 | #ifdef PACKET_REFCNT_DEBUG | |
240 | printk(KERN_DEBUG "PACKET socket %p is free, %d are alive\n", sk, atomic_read(&packet_socks_nr)); | |
241 | #endif | |
242 | } | |
243 | ||
244 | ||
90ddc4f0 | 245 | static const struct proto_ops packet_ops; |
1da177e4 | 246 | |
90ddc4f0 | 247 | static const struct proto_ops packet_ops_spkt; |
1da177e4 | 248 | |
f2ccd8fa | 249 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
250 | { |
251 | struct sock *sk; | |
252 | struct sockaddr_pkt *spkt; | |
253 | ||
254 | /* | |
255 | * When we registered the protocol we saved the socket in the data | |
256 | * field for just this event. | |
257 | */ | |
258 | ||
259 | sk = pt->af_packet_priv; | |
1ce4f28b | 260 | |
1da177e4 LT |
261 | /* |
262 | * Yank back the headers [hope the device set this | |
263 | * right or kerboom...] | |
264 | * | |
265 | * Incoming packets have ll header pulled, | |
266 | * push it back. | |
267 | * | |
98e399f8 | 268 | * For outgoing ones skb->data == skb_mac_header(skb) |
1da177e4 LT |
269 | * so that this procedure is noop. |
270 | */ | |
271 | ||
272 | if (skb->pkt_type == PACKET_LOOPBACK) | |
273 | goto out; | |
274 | ||
275 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
276 | goto oom; | |
277 | ||
278 | /* drop any routing info */ | |
279 | dst_release(skb->dst); | |
280 | skb->dst = NULL; | |
281 | ||
84531c24 PO |
282 | /* drop conntrack reference */ |
283 | nf_reset(skb); | |
284 | ||
ffbc6111 | 285 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
1da177e4 | 286 | |
98e399f8 | 287 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
288 | |
289 | /* | |
290 | * The SOCK_PACKET socket receives _all_ frames. | |
291 | */ | |
292 | ||
293 | spkt->spkt_family = dev->type; | |
294 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
295 | spkt->spkt_protocol = skb->protocol; | |
296 | ||
297 | /* | |
298 | * Charge the memory to the socket. This is done specifically | |
299 | * to prevent sockets using all the memory up. | |
300 | */ | |
301 | ||
302 | if (sock_queue_rcv_skb(sk,skb) == 0) | |
303 | return 0; | |
304 | ||
305 | out: | |
306 | kfree_skb(skb); | |
307 | oom: | |
308 | return 0; | |
309 | } | |
310 | ||
311 | ||
312 | /* | |
313 | * Output a raw packet to a device layer. This bypasses all the other | |
314 | * protocol layers and you must therefore supply it with a complete frame | |
315 | */ | |
1ce4f28b | 316 | |
1da177e4 LT |
317 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, |
318 | struct msghdr *msg, size_t len) | |
319 | { | |
320 | struct sock *sk = sock->sk; | |
321 | struct sockaddr_pkt *saddr=(struct sockaddr_pkt *)msg->msg_name; | |
322 | struct sk_buff *skb; | |
323 | struct net_device *dev; | |
0e11c91e | 324 | __be16 proto=0; |
1da177e4 | 325 | int err; |
1ce4f28b | 326 | |
1da177e4 | 327 | /* |
1ce4f28b | 328 | * Get and verify the address. |
1da177e4 LT |
329 | */ |
330 | ||
331 | if (saddr) | |
332 | { | |
333 | if (msg->msg_namelen < sizeof(struct sockaddr)) | |
334 | return(-EINVAL); | |
335 | if (msg->msg_namelen==sizeof(struct sockaddr_pkt)) | |
336 | proto=saddr->spkt_protocol; | |
337 | } | |
338 | else | |
339 | return(-ENOTCONN); /* SOCK_PACKET must be sent giving an address */ | |
340 | ||
341 | /* | |
1ce4f28b | 342 | * Find the device first to size check it |
1da177e4 LT |
343 | */ |
344 | ||
345 | saddr->spkt_device[13] = 0; | |
346 | dev = dev_get_by_name(saddr->spkt_device); | |
347 | err = -ENODEV; | |
348 | if (dev == NULL) | |
349 | goto out_unlock; | |
1ce4f28b | 350 | |
d5e76b0a DM |
351 | err = -ENETDOWN; |
352 | if (!(dev->flags & IFF_UP)) | |
353 | goto out_unlock; | |
354 | ||
1da177e4 LT |
355 | /* |
356 | * You may not queue a frame bigger than the mtu. This is the lowest level | |
357 | * raw protocol and you must do your own fragmentation at this level. | |
358 | */ | |
1ce4f28b | 359 | |
1da177e4 | 360 | err = -EMSGSIZE; |
8ae55f04 | 361 | if (len > dev->mtu + dev->hard_header_len) |
1da177e4 LT |
362 | goto out_unlock; |
363 | ||
364 | err = -ENOBUFS; | |
365 | skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL); | |
366 | ||
367 | /* | |
368 | * If the write buffer is full, then tough. At this level the user gets to | |
369 | * deal with the problem - do your own algorithmic backoffs. That's far | |
370 | * more flexible. | |
371 | */ | |
1ce4f28b YH |
372 | |
373 | if (skb == NULL) | |
1da177e4 LT |
374 | goto out_unlock; |
375 | ||
376 | /* | |
1ce4f28b | 377 | * Fill it in |
1da177e4 | 378 | */ |
1ce4f28b | 379 | |
1da177e4 LT |
380 | /* FIXME: Save some space for broken drivers that write a |
381 | * hard header at transmission time by themselves. PPP is the | |
382 | * notable one here. This should really be fixed at the driver level. | |
383 | */ | |
384 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
c1d2bbe1 | 385 | skb_reset_network_header(skb); |
1da177e4 LT |
386 | |
387 | /* Try to align data part correctly */ | |
388 | if (dev->hard_header) { | |
389 | skb->data -= dev->hard_header_len; | |
390 | skb->tail -= dev->hard_header_len; | |
391 | if (len < dev->hard_header_len) | |
c1d2bbe1 | 392 | skb_reset_network_header(skb); |
1da177e4 LT |
393 | } |
394 | ||
395 | /* Returns -EFAULT on error */ | |
396 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); | |
397 | skb->protocol = proto; | |
398 | skb->dev = dev; | |
399 | skb->priority = sk->sk_priority; | |
400 | if (err) | |
401 | goto out_free; | |
402 | ||
1da177e4 LT |
403 | /* |
404 | * Now send it | |
405 | */ | |
406 | ||
407 | dev_queue_xmit(skb); | |
408 | dev_put(dev); | |
409 | return(len); | |
410 | ||
411 | out_free: | |
412 | kfree_skb(skb); | |
413 | out_unlock: | |
414 | if (dev) | |
415 | dev_put(dev); | |
416 | return err; | |
417 | } | |
1da177e4 | 418 | |
dbcb5855 DM |
419 | static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk, |
420 | unsigned int res) | |
1da177e4 LT |
421 | { |
422 | struct sk_filter *filter; | |
fda9ef5d DM |
423 | |
424 | rcu_read_lock_bh(); | |
425 | filter = rcu_dereference(sk->sk_filter); | |
dbcb5855 DM |
426 | if (filter != NULL) |
427 | res = sk_run_filter(skb, filter->insns, filter->len); | |
fda9ef5d | 428 | rcu_read_unlock_bh(); |
1da177e4 | 429 | |
dbcb5855 | 430 | return res; |
1da177e4 LT |
431 | } |
432 | ||
433 | /* | |
434 | This function makes lazy skb cloning in hope that most of packets | |
435 | are discarded by BPF. | |
436 | ||
437 | Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
438 | and skb->cb are mangled. It works because (and until) packets | |
439 | falling here are owned by current CPU. Output packets are cloned | |
440 | by dev_queue_xmit_nit(), input packets are processed by net_bh | |
441 | sequencially, so that if we return skb to original state on exit, | |
442 | we will not harm anyone. | |
443 | */ | |
444 | ||
f2ccd8fa | 445 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
446 | { |
447 | struct sock *sk; | |
448 | struct sockaddr_ll *sll; | |
449 | struct packet_sock *po; | |
450 | u8 * skb_head = skb->data; | |
451 | int skb_len = skb->len; | |
dbcb5855 | 452 | unsigned int snaplen, res; |
1da177e4 LT |
453 | |
454 | if (skb->pkt_type == PACKET_LOOPBACK) | |
455 | goto drop; | |
456 | ||
457 | sk = pt->af_packet_priv; | |
458 | po = pkt_sk(sk); | |
459 | ||
460 | skb->dev = dev; | |
461 | ||
462 | if (dev->hard_header) { | |
463 | /* The device has an explicit notion of ll header, | |
464 | exported to higher levels. | |
465 | ||
466 | Otherwise, the device hides datails of it frame | |
467 | structure, so that corresponding packet head | |
468 | never delivered to user. | |
469 | */ | |
470 | if (sk->sk_type != SOCK_DGRAM) | |
98e399f8 | 471 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
472 | else if (skb->pkt_type == PACKET_OUTGOING) { |
473 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 474 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
475 | } |
476 | } | |
477 | ||
478 | snaplen = skb->len; | |
479 | ||
dbcb5855 DM |
480 | res = run_filter(skb, sk, snaplen); |
481 | if (!res) | |
fda9ef5d | 482 | goto drop_n_restore; |
dbcb5855 DM |
483 | if (snaplen > res) |
484 | snaplen = res; | |
1da177e4 LT |
485 | |
486 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
487 | (unsigned)sk->sk_rcvbuf) | |
488 | goto drop_n_acct; | |
489 | ||
490 | if (skb_shared(skb)) { | |
491 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
492 | if (nskb == NULL) | |
493 | goto drop_n_acct; | |
494 | ||
495 | if (skb_head != skb->data) { | |
496 | skb->data = skb_head; | |
497 | skb->len = skb_len; | |
498 | } | |
499 | kfree_skb(skb); | |
500 | skb = nskb; | |
501 | } | |
502 | ||
ffbc6111 HX |
503 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
504 | sizeof(skb->cb)); | |
505 | ||
506 | sll = &PACKET_SKB_CB(skb)->sa.ll; | |
1da177e4 LT |
507 | sll->sll_family = AF_PACKET; |
508 | sll->sll_hatype = dev->type; | |
509 | sll->sll_protocol = skb->protocol; | |
510 | sll->sll_pkttype = skb->pkt_type; | |
80feaacb PWJ |
511 | if (unlikely(po->origdev) && skb->pkt_type == PACKET_HOST) |
512 | sll->sll_ifindex = orig_dev->ifindex; | |
513 | else | |
514 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 LT |
515 | sll->sll_halen = 0; |
516 | ||
517 | if (dev->hard_header_parse) | |
518 | sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); | |
519 | ||
ffbc6111 | 520 | PACKET_SKB_CB(skb)->origlen = skb->len; |
8dc41944 | 521 | |
1da177e4 LT |
522 | if (pskb_trim(skb, snaplen)) |
523 | goto drop_n_acct; | |
524 | ||
525 | skb_set_owner_r(skb, sk); | |
526 | skb->dev = NULL; | |
527 | dst_release(skb->dst); | |
528 | skb->dst = NULL; | |
529 | ||
84531c24 PO |
530 | /* drop conntrack reference */ |
531 | nf_reset(skb); | |
532 | ||
1da177e4 LT |
533 | spin_lock(&sk->sk_receive_queue.lock); |
534 | po->stats.tp_packets++; | |
535 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
536 | spin_unlock(&sk->sk_receive_queue.lock); | |
537 | sk->sk_data_ready(sk, skb->len); | |
538 | return 0; | |
539 | ||
540 | drop_n_acct: | |
541 | spin_lock(&sk->sk_receive_queue.lock); | |
542 | po->stats.tp_drops++; | |
543 | spin_unlock(&sk->sk_receive_queue.lock); | |
544 | ||
545 | drop_n_restore: | |
546 | if (skb_head != skb->data && skb_shared(skb)) { | |
547 | skb->data = skb_head; | |
548 | skb->len = skb_len; | |
549 | } | |
550 | drop: | |
551 | kfree_skb(skb); | |
552 | return 0; | |
553 | } | |
554 | ||
555 | #ifdef CONFIG_PACKET_MMAP | |
f2ccd8fa | 556 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
557 | { |
558 | struct sock *sk; | |
559 | struct packet_sock *po; | |
560 | struct sockaddr_ll *sll; | |
561 | struct tpacket_hdr *h; | |
562 | u8 * skb_head = skb->data; | |
563 | int skb_len = skb->len; | |
dbcb5855 | 564 | unsigned int snaplen, res; |
1da177e4 LT |
565 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
566 | unsigned short macoff, netoff; | |
567 | struct sk_buff *copy_skb = NULL; | |
b7aa0bf7 | 568 | struct timeval tv; |
1da177e4 LT |
569 | |
570 | if (skb->pkt_type == PACKET_LOOPBACK) | |
571 | goto drop; | |
572 | ||
573 | sk = pt->af_packet_priv; | |
574 | po = pkt_sk(sk); | |
575 | ||
576 | if (dev->hard_header) { | |
577 | if (sk->sk_type != SOCK_DGRAM) | |
98e399f8 | 578 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
579 | else if (skb->pkt_type == PACKET_OUTGOING) { |
580 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 581 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
582 | } |
583 | } | |
584 | ||
8dc41944 HX |
585 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
586 | status |= TP_STATUS_CSUMNOTREADY; | |
587 | ||
1da177e4 LT |
588 | snaplen = skb->len; |
589 | ||
dbcb5855 DM |
590 | res = run_filter(skb, sk, snaplen); |
591 | if (!res) | |
fda9ef5d | 592 | goto drop_n_restore; |
dbcb5855 DM |
593 | if (snaplen > res) |
594 | snaplen = res; | |
1da177e4 LT |
595 | |
596 | if (sk->sk_type == SOCK_DGRAM) { | |
597 | macoff = netoff = TPACKET_ALIGN(TPACKET_HDRLEN) + 16; | |
598 | } else { | |
bbe735e4 | 599 | unsigned maclen = skb_network_offset(skb); |
1da177e4 LT |
600 | netoff = TPACKET_ALIGN(TPACKET_HDRLEN + (maclen < 16 ? 16 : maclen)); |
601 | macoff = netoff - maclen; | |
602 | } | |
603 | ||
604 | if (macoff + snaplen > po->frame_size) { | |
605 | if (po->copy_thresh && | |
606 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < | |
607 | (unsigned)sk->sk_rcvbuf) { | |
608 | if (skb_shared(skb)) { | |
609 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
610 | } else { | |
611 | copy_skb = skb_get(skb); | |
612 | skb_head = skb->data; | |
613 | } | |
614 | if (copy_skb) | |
615 | skb_set_owner_r(copy_skb, sk); | |
616 | } | |
617 | snaplen = po->frame_size - macoff; | |
618 | if ((int)snaplen < 0) | |
619 | snaplen = 0; | |
620 | } | |
1da177e4 LT |
621 | |
622 | spin_lock(&sk->sk_receive_queue.lock); | |
ad930650 | 623 | h = packet_lookup_frame(po, po->head); |
1ce4f28b | 624 | |
1da177e4 LT |
625 | if (h->tp_status) |
626 | goto ring_is_full; | |
627 | po->head = po->head != po->frame_max ? po->head+1 : 0; | |
628 | po->stats.tp_packets++; | |
629 | if (copy_skb) { | |
630 | status |= TP_STATUS_COPY; | |
631 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
632 | } | |
633 | if (!po->stats.tp_drops) | |
634 | status &= ~TP_STATUS_LOSING; | |
635 | spin_unlock(&sk->sk_receive_queue.lock); | |
636 | ||
cbe21d8f | 637 | skb_copy_bits(skb, 0, (u8*)h + macoff, snaplen); |
1da177e4 LT |
638 | |
639 | h->tp_len = skb->len; | |
640 | h->tp_snaplen = snaplen; | |
641 | h->tp_mac = macoff; | |
642 | h->tp_net = netoff; | |
50f17787 SH |
643 | if (skb->tstamp.tv64) |
644 | tv = ktime_to_timeval(skb->tstamp); | |
645 | else | |
646 | do_gettimeofday(&tv); | |
b7aa0bf7 ED |
647 | h->tp_sec = tv.tv_sec; |
648 | h->tp_usec = tv.tv_usec; | |
1da177e4 LT |
649 | |
650 | sll = (struct sockaddr_ll*)((u8*)h + TPACKET_ALIGN(sizeof(*h))); | |
651 | sll->sll_halen = 0; | |
652 | if (dev->hard_header_parse) | |
653 | sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); | |
654 | sll->sll_family = AF_PACKET; | |
655 | sll->sll_hatype = dev->type; | |
656 | sll->sll_protocol = skb->protocol; | |
657 | sll->sll_pkttype = skb->pkt_type; | |
80feaacb PWJ |
658 | if (unlikely(po->origdev) && skb->pkt_type == PACKET_HOST) |
659 | sll->sll_ifindex = orig_dev->ifindex; | |
660 | else | |
661 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 LT |
662 | |
663 | h->tp_status = status; | |
e16aa207 | 664 | smp_mb(); |
1da177e4 LT |
665 | |
666 | { | |
667 | struct page *p_start, *p_end; | |
668 | u8 *h_end = (u8 *)h + macoff + snaplen - 1; | |
669 | ||
670 | p_start = virt_to_page(h); | |
671 | p_end = virt_to_page(h_end); | |
672 | while (p_start <= p_end) { | |
673 | flush_dcache_page(p_start); | |
674 | p_start++; | |
675 | } | |
676 | } | |
677 | ||
678 | sk->sk_data_ready(sk, 0); | |
679 | ||
680 | drop_n_restore: | |
681 | if (skb_head != skb->data && skb_shared(skb)) { | |
682 | skb->data = skb_head; | |
683 | skb->len = skb_len; | |
684 | } | |
685 | drop: | |
1ce4f28b | 686 | kfree_skb(skb); |
1da177e4 LT |
687 | return 0; |
688 | ||
689 | ring_is_full: | |
690 | po->stats.tp_drops++; | |
691 | spin_unlock(&sk->sk_receive_queue.lock); | |
692 | ||
693 | sk->sk_data_ready(sk, 0); | |
694 | if (copy_skb) | |
695 | kfree_skb(copy_skb); | |
696 | goto drop_n_restore; | |
697 | } | |
698 | ||
699 | #endif | |
700 | ||
701 | ||
702 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, | |
703 | struct msghdr *msg, size_t len) | |
704 | { | |
705 | struct sock *sk = sock->sk; | |
706 | struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name; | |
707 | struct sk_buff *skb; | |
708 | struct net_device *dev; | |
0e11c91e | 709 | __be16 proto; |
1da177e4 LT |
710 | unsigned char *addr; |
711 | int ifindex, err, reserve = 0; | |
712 | ||
713 | /* | |
1ce4f28b | 714 | * Get and verify the address. |
1da177e4 | 715 | */ |
1ce4f28b | 716 | |
1da177e4 LT |
717 | if (saddr == NULL) { |
718 | struct packet_sock *po = pkt_sk(sk); | |
719 | ||
720 | ifindex = po->ifindex; | |
721 | proto = po->num; | |
722 | addr = NULL; | |
723 | } else { | |
724 | err = -EINVAL; | |
725 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
726 | goto out; | |
0fb375fb EB |
727 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
728 | goto out; | |
1da177e4 LT |
729 | ifindex = saddr->sll_ifindex; |
730 | proto = saddr->sll_protocol; | |
731 | addr = saddr->sll_addr; | |
732 | } | |
733 | ||
734 | ||
735 | dev = dev_get_by_index(ifindex); | |
736 | err = -ENXIO; | |
737 | if (dev == NULL) | |
738 | goto out_unlock; | |
739 | if (sock->type == SOCK_RAW) | |
740 | reserve = dev->hard_header_len; | |
741 | ||
d5e76b0a DM |
742 | err = -ENETDOWN; |
743 | if (!(dev->flags & IFF_UP)) | |
744 | goto out_unlock; | |
745 | ||
1da177e4 LT |
746 | err = -EMSGSIZE; |
747 | if (len > dev->mtu+reserve) | |
748 | goto out_unlock; | |
749 | ||
750 | skb = sock_alloc_send_skb(sk, len + LL_RESERVED_SPACE(dev), | |
751 | msg->msg_flags & MSG_DONTWAIT, &err); | |
752 | if (skb==NULL) | |
753 | goto out_unlock; | |
754 | ||
755 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
c1d2bbe1 | 756 | skb_reset_network_header(skb); |
1da177e4 LT |
757 | |
758 | if (dev->hard_header) { | |
759 | int res; | |
760 | err = -EINVAL; | |
761 | res = dev->hard_header(skb, dev, ntohs(proto), addr, NULL, len); | |
762 | if (sock->type != SOCK_DGRAM) { | |
27a884dc | 763 | skb_reset_tail_pointer(skb); |
1da177e4 LT |
764 | skb->len = 0; |
765 | } else if (res < 0) | |
766 | goto out_free; | |
767 | } | |
768 | ||
769 | /* Returns -EFAULT on error */ | |
770 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); | |
771 | if (err) | |
772 | goto out_free; | |
773 | ||
774 | skb->protocol = proto; | |
775 | skb->dev = dev; | |
776 | skb->priority = sk->sk_priority; | |
777 | ||
1da177e4 LT |
778 | /* |
779 | * Now send it | |
780 | */ | |
781 | ||
782 | err = dev_queue_xmit(skb); | |
783 | if (err > 0 && (err = net_xmit_errno(err)) != 0) | |
784 | goto out_unlock; | |
785 | ||
786 | dev_put(dev); | |
787 | ||
788 | return(len); | |
789 | ||
790 | out_free: | |
791 | kfree_skb(skb); | |
792 | out_unlock: | |
793 | if (dev) | |
794 | dev_put(dev); | |
795 | out: | |
796 | return err; | |
797 | } | |
798 | ||
799 | /* | |
800 | * Close a PACKET socket. This is fairly simple. We immediately go | |
801 | * to 'closed' state and remove our protocol entry in the device list. | |
802 | */ | |
803 | ||
804 | static int packet_release(struct socket *sock) | |
805 | { | |
806 | struct sock *sk = sock->sk; | |
807 | struct packet_sock *po; | |
808 | ||
809 | if (!sk) | |
810 | return 0; | |
811 | ||
812 | po = pkt_sk(sk); | |
813 | ||
814 | write_lock_bh(&packet_sklist_lock); | |
815 | sk_del_node_init(sk); | |
816 | write_unlock_bh(&packet_sklist_lock); | |
817 | ||
818 | /* | |
819 | * Unhook packet receive handler. | |
820 | */ | |
821 | ||
822 | if (po->running) { | |
823 | /* | |
824 | * Remove the protocol hook | |
825 | */ | |
826 | dev_remove_pack(&po->prot_hook); | |
827 | po->running = 0; | |
828 | po->num = 0; | |
829 | __sock_put(sk); | |
830 | } | |
831 | ||
1da177e4 | 832 | packet_flush_mclist(sk); |
1da177e4 LT |
833 | |
834 | #ifdef CONFIG_PACKET_MMAP | |
835 | if (po->pg_vec) { | |
836 | struct tpacket_req req; | |
837 | memset(&req, 0, sizeof(req)); | |
838 | packet_set_ring(sk, &req, 1); | |
839 | } | |
840 | #endif | |
841 | ||
842 | /* | |
843 | * Now the socket is dead. No more input will appear. | |
844 | */ | |
845 | ||
846 | sock_orphan(sk); | |
847 | sock->sk = NULL; | |
848 | ||
849 | /* Purge queues */ | |
850 | ||
851 | skb_queue_purge(&sk->sk_receive_queue); | |
852 | ||
853 | sock_put(sk); | |
854 | return 0; | |
855 | } | |
856 | ||
857 | /* | |
858 | * Attach a packet hook. | |
859 | */ | |
860 | ||
0e11c91e | 861 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
1da177e4 LT |
862 | { |
863 | struct packet_sock *po = pkt_sk(sk); | |
864 | /* | |
865 | * Detach an existing hook if present. | |
866 | */ | |
867 | ||
868 | lock_sock(sk); | |
869 | ||
870 | spin_lock(&po->bind_lock); | |
871 | if (po->running) { | |
872 | __sock_put(sk); | |
873 | po->running = 0; | |
874 | po->num = 0; | |
875 | spin_unlock(&po->bind_lock); | |
876 | dev_remove_pack(&po->prot_hook); | |
877 | spin_lock(&po->bind_lock); | |
878 | } | |
879 | ||
880 | po->num = protocol; | |
881 | po->prot_hook.type = protocol; | |
882 | po->prot_hook.dev = dev; | |
883 | ||
884 | po->ifindex = dev ? dev->ifindex : 0; | |
885 | ||
886 | if (protocol == 0) | |
887 | goto out_unlock; | |
888 | ||
889 | if (dev) { | |
890 | if (dev->flags&IFF_UP) { | |
891 | dev_add_pack(&po->prot_hook); | |
892 | sock_hold(sk); | |
893 | po->running = 1; | |
894 | } else { | |
895 | sk->sk_err = ENETDOWN; | |
896 | if (!sock_flag(sk, SOCK_DEAD)) | |
897 | sk->sk_error_report(sk); | |
898 | } | |
899 | } else { | |
900 | dev_add_pack(&po->prot_hook); | |
901 | sock_hold(sk); | |
902 | po->running = 1; | |
903 | } | |
904 | ||
905 | out_unlock: | |
906 | spin_unlock(&po->bind_lock); | |
907 | release_sock(sk); | |
908 | return 0; | |
909 | } | |
910 | ||
911 | /* | |
912 | * Bind a packet socket to a device | |
913 | */ | |
914 | ||
1da177e4 LT |
915 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
916 | { | |
917 | struct sock *sk=sock->sk; | |
918 | char name[15]; | |
919 | struct net_device *dev; | |
920 | int err = -ENODEV; | |
1ce4f28b | 921 | |
1da177e4 LT |
922 | /* |
923 | * Check legality | |
924 | */ | |
1ce4f28b | 925 | |
8ae55f04 | 926 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 LT |
927 | return -EINVAL; |
928 | strlcpy(name,uaddr->sa_data,sizeof(name)); | |
929 | ||
930 | dev = dev_get_by_name(name); | |
931 | if (dev) { | |
932 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); | |
933 | dev_put(dev); | |
934 | } | |
935 | return err; | |
936 | } | |
1da177e4 LT |
937 | |
938 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
939 | { | |
940 | struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; | |
941 | struct sock *sk=sock->sk; | |
942 | struct net_device *dev = NULL; | |
943 | int err; | |
944 | ||
945 | ||
946 | /* | |
947 | * Check legality | |
948 | */ | |
1ce4f28b | 949 | |
1da177e4 LT |
950 | if (addr_len < sizeof(struct sockaddr_ll)) |
951 | return -EINVAL; | |
952 | if (sll->sll_family != AF_PACKET) | |
953 | return -EINVAL; | |
954 | ||
955 | if (sll->sll_ifindex) { | |
956 | err = -ENODEV; | |
957 | dev = dev_get_by_index(sll->sll_ifindex); | |
958 | if (dev == NULL) | |
959 | goto out; | |
960 | } | |
961 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
962 | if (dev) | |
963 | dev_put(dev); | |
964 | ||
965 | out: | |
966 | return err; | |
967 | } | |
968 | ||
969 | static struct proto packet_proto = { | |
970 | .name = "PACKET", | |
971 | .owner = THIS_MODULE, | |
972 | .obj_size = sizeof(struct packet_sock), | |
973 | }; | |
974 | ||
975 | /* | |
1ce4f28b | 976 | * Create a packet of type SOCK_PACKET. |
1da177e4 LT |
977 | */ |
978 | ||
979 | static int packet_create(struct socket *sock, int protocol) | |
980 | { | |
981 | struct sock *sk; | |
982 | struct packet_sock *po; | |
0e11c91e | 983 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1da177e4 LT |
984 | int err; |
985 | ||
986 | if (!capable(CAP_NET_RAW)) | |
987 | return -EPERM; | |
be02097c DM |
988 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
989 | sock->type != SOCK_PACKET) | |
1da177e4 LT |
990 | return -ESOCKTNOSUPPORT; |
991 | ||
992 | sock->state = SS_UNCONNECTED; | |
993 | ||
994 | err = -ENOBUFS; | |
995 | sk = sk_alloc(PF_PACKET, GFP_KERNEL, &packet_proto, 1); | |
996 | if (sk == NULL) | |
997 | goto out; | |
998 | ||
999 | sock->ops = &packet_ops; | |
1da177e4 LT |
1000 | if (sock->type == SOCK_PACKET) |
1001 | sock->ops = &packet_ops_spkt; | |
be02097c | 1002 | |
1da177e4 LT |
1003 | sock_init_data(sock, sk); |
1004 | ||
1005 | po = pkt_sk(sk); | |
1006 | sk->sk_family = PF_PACKET; | |
0e11c91e | 1007 | po->num = proto; |
1da177e4 LT |
1008 | |
1009 | sk->sk_destruct = packet_sock_destruct; | |
1010 | atomic_inc(&packet_socks_nr); | |
1011 | ||
1012 | /* | |
1013 | * Attach a protocol block | |
1014 | */ | |
1015 | ||
1016 | spin_lock_init(&po->bind_lock); | |
1017 | po->prot_hook.func = packet_rcv; | |
be02097c | 1018 | |
1da177e4 LT |
1019 | if (sock->type == SOCK_PACKET) |
1020 | po->prot_hook.func = packet_rcv_spkt; | |
be02097c | 1021 | |
1da177e4 LT |
1022 | po->prot_hook.af_packet_priv = sk; |
1023 | ||
0e11c91e AV |
1024 | if (proto) { |
1025 | po->prot_hook.type = proto; | |
1da177e4 LT |
1026 | dev_add_pack(&po->prot_hook); |
1027 | sock_hold(sk); | |
1028 | po->running = 1; | |
1029 | } | |
1030 | ||
1031 | write_lock_bh(&packet_sklist_lock); | |
1032 | sk_add_node(sk, &packet_sklist); | |
1033 | write_unlock_bh(&packet_sklist_lock); | |
1034 | return(0); | |
1035 | out: | |
1036 | return err; | |
1037 | } | |
1038 | ||
1039 | /* | |
1040 | * Pull a packet from our receive queue and hand it to the user. | |
1041 | * If necessary we block. | |
1042 | */ | |
1043 | ||
1044 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1045 | struct msghdr *msg, size_t len, int flags) | |
1046 | { | |
1047 | struct sock *sk = sock->sk; | |
1048 | struct sk_buff *skb; | |
1049 | int copied, err; | |
0fb375fb | 1050 | struct sockaddr_ll *sll; |
1da177e4 LT |
1051 | |
1052 | err = -EINVAL; | |
1053 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) | |
1054 | goto out; | |
1055 | ||
1056 | #if 0 | |
1057 | /* What error should we return now? EUNATTACH? */ | |
1058 | if (pkt_sk(sk)->ifindex < 0) | |
1059 | return -ENODEV; | |
1060 | #endif | |
1061 | ||
1da177e4 LT |
1062 | /* |
1063 | * Call the generic datagram receiver. This handles all sorts | |
1064 | * of horrible races and re-entrancy so we can forget about it | |
1065 | * in the protocol layers. | |
1066 | * | |
1067 | * Now it will return ENETDOWN, if device have just gone down, | |
1068 | * but then it will block. | |
1069 | */ | |
1070 | ||
1071 | skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&err); | |
1072 | ||
1073 | /* | |
1ce4f28b | 1074 | * An error occurred so return it. Because skb_recv_datagram() |
1da177e4 LT |
1075 | * handles the blocking we don't see and worry about blocking |
1076 | * retries. | |
1077 | */ | |
1078 | ||
8ae55f04 | 1079 | if (skb == NULL) |
1da177e4 LT |
1080 | goto out; |
1081 | ||
0fb375fb EB |
1082 | /* |
1083 | * If the address length field is there to be filled in, we fill | |
1084 | * it in now. | |
1085 | */ | |
1086 | ||
ffbc6111 | 1087 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
0fb375fb EB |
1088 | if (sock->type == SOCK_PACKET) |
1089 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
1090 | else | |
1091 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); | |
1092 | ||
1da177e4 LT |
1093 | /* |
1094 | * You lose any data beyond the buffer you gave. If it worries a | |
1095 | * user program they can ask the device for its MTU anyway. | |
1096 | */ | |
1097 | ||
1098 | copied = skb->len; | |
1099 | if (copied > len) | |
1100 | { | |
1101 | copied=len; | |
1102 | msg->msg_flags|=MSG_TRUNC; | |
1103 | } | |
1104 | ||
1105 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1106 | if (err) | |
1107 | goto out_free; | |
1108 | ||
1109 | sock_recv_timestamp(msg, sk, skb); | |
1110 | ||
1111 | if (msg->msg_name) | |
ffbc6111 HX |
1112 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
1113 | msg->msg_namelen); | |
1da177e4 | 1114 | |
8dc41944 | 1115 | if (pkt_sk(sk)->auxdata) { |
ffbc6111 HX |
1116 | struct tpacket_auxdata aux; |
1117 | ||
1118 | aux.tp_status = TP_STATUS_USER; | |
1119 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
1120 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; | |
1121 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; | |
1122 | aux.tp_snaplen = skb->len; | |
1123 | aux.tp_mac = 0; | |
bbe735e4 | 1124 | aux.tp_net = skb_network_offset(skb); |
ffbc6111 HX |
1125 | |
1126 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); | |
8dc41944 HX |
1127 | } |
1128 | ||
1da177e4 LT |
1129 | /* |
1130 | * Free or return the buffer as appropriate. Again this | |
1131 | * hides all the races and re-entrancy issues from us. | |
1132 | */ | |
1133 | err = (flags&MSG_TRUNC) ? skb->len : copied; | |
1134 | ||
1135 | out_free: | |
1136 | skb_free_datagram(sk, skb); | |
1137 | out: | |
1138 | return err; | |
1139 | } | |
1140 | ||
1da177e4 LT |
1141 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
1142 | int *uaddr_len, int peer) | |
1143 | { | |
1144 | struct net_device *dev; | |
1145 | struct sock *sk = sock->sk; | |
1146 | ||
1147 | if (peer) | |
1148 | return -EOPNOTSUPP; | |
1149 | ||
1150 | uaddr->sa_family = AF_PACKET; | |
1151 | dev = dev_get_by_index(pkt_sk(sk)->ifindex); | |
1152 | if (dev) { | |
1153 | strlcpy(uaddr->sa_data, dev->name, 15); | |
1154 | dev_put(dev); | |
1155 | } else | |
1156 | memset(uaddr->sa_data, 0, 14); | |
1157 | *uaddr_len = sizeof(*uaddr); | |
1158 | ||
1159 | return 0; | |
1160 | } | |
1da177e4 LT |
1161 | |
1162 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
1163 | int *uaddr_len, int peer) | |
1164 | { | |
1165 | struct net_device *dev; | |
1166 | struct sock *sk = sock->sk; | |
1167 | struct packet_sock *po = pkt_sk(sk); | |
1168 | struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; | |
1169 | ||
1170 | if (peer) | |
1171 | return -EOPNOTSUPP; | |
1172 | ||
1173 | sll->sll_family = AF_PACKET; | |
1174 | sll->sll_ifindex = po->ifindex; | |
1175 | sll->sll_protocol = po->num; | |
1176 | dev = dev_get_by_index(po->ifindex); | |
1177 | if (dev) { | |
1178 | sll->sll_hatype = dev->type; | |
1179 | sll->sll_halen = dev->addr_len; | |
1180 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1181 | dev_put(dev); | |
1182 | } else { | |
1183 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
1184 | sll->sll_halen = 0; | |
1185 | } | |
0fb375fb | 1186 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
1187 | |
1188 | return 0; | |
1189 | } | |
1190 | ||
1da177e4 LT |
1191 | static void packet_dev_mc(struct net_device *dev, struct packet_mclist *i, int what) |
1192 | { | |
1193 | switch (i->type) { | |
1194 | case PACKET_MR_MULTICAST: | |
1195 | if (what > 0) | |
1196 | dev_mc_add(dev, i->addr, i->alen, 0); | |
1197 | else | |
1198 | dev_mc_delete(dev, i->addr, i->alen, 0); | |
1199 | break; | |
1200 | case PACKET_MR_PROMISC: | |
1201 | dev_set_promiscuity(dev, what); | |
1202 | break; | |
1203 | case PACKET_MR_ALLMULTI: | |
1204 | dev_set_allmulti(dev, what); | |
1205 | break; | |
1206 | default:; | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
1211 | { | |
1212 | for ( ; i; i=i->next) { | |
1213 | if (i->ifindex == dev->ifindex) | |
1214 | packet_dev_mc(dev, i, what); | |
1215 | } | |
1216 | } | |
1217 | ||
0fb375fb | 1218 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1219 | { |
1220 | struct packet_sock *po = pkt_sk(sk); | |
1221 | struct packet_mclist *ml, *i; | |
1222 | struct net_device *dev; | |
1223 | int err; | |
1224 | ||
1225 | rtnl_lock(); | |
1226 | ||
1227 | err = -ENODEV; | |
1228 | dev = __dev_get_by_index(mreq->mr_ifindex); | |
1229 | if (!dev) | |
1230 | goto done; | |
1231 | ||
1232 | err = -EINVAL; | |
1233 | if (mreq->mr_alen > dev->addr_len) | |
1234 | goto done; | |
1235 | ||
1236 | err = -ENOBUFS; | |
8b3a7005 | 1237 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
1238 | if (i == NULL) |
1239 | goto done; | |
1240 | ||
1241 | err = 0; | |
1242 | for (ml = po->mclist; ml; ml = ml->next) { | |
1243 | if (ml->ifindex == mreq->mr_ifindex && | |
1244 | ml->type == mreq->mr_type && | |
1245 | ml->alen == mreq->mr_alen && | |
1246 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1247 | ml->count++; | |
1248 | /* Free the new element ... */ | |
1249 | kfree(i); | |
1250 | goto done; | |
1251 | } | |
1252 | } | |
1253 | ||
1254 | i->type = mreq->mr_type; | |
1255 | i->ifindex = mreq->mr_ifindex; | |
1256 | i->alen = mreq->mr_alen; | |
1257 | memcpy(i->addr, mreq->mr_address, i->alen); | |
1258 | i->count = 1; | |
1259 | i->next = po->mclist; | |
1260 | po->mclist = i; | |
1261 | packet_dev_mc(dev, i, +1); | |
1262 | ||
1263 | done: | |
1264 | rtnl_unlock(); | |
1265 | return err; | |
1266 | } | |
1267 | ||
0fb375fb | 1268 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1269 | { |
1270 | struct packet_mclist *ml, **mlp; | |
1271 | ||
1272 | rtnl_lock(); | |
1273 | ||
1274 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
1275 | if (ml->ifindex == mreq->mr_ifindex && | |
1276 | ml->type == mreq->mr_type && | |
1277 | ml->alen == mreq->mr_alen && | |
1278 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1279 | if (--ml->count == 0) { | |
1280 | struct net_device *dev; | |
1281 | *mlp = ml->next; | |
1282 | dev = dev_get_by_index(ml->ifindex); | |
1283 | if (dev) { | |
1284 | packet_dev_mc(dev, ml, -1); | |
1285 | dev_put(dev); | |
1286 | } | |
1287 | kfree(ml); | |
1288 | } | |
1289 | rtnl_unlock(); | |
1290 | return 0; | |
1291 | } | |
1292 | } | |
1293 | rtnl_unlock(); | |
1294 | return -EADDRNOTAVAIL; | |
1295 | } | |
1296 | ||
1297 | static void packet_flush_mclist(struct sock *sk) | |
1298 | { | |
1299 | struct packet_sock *po = pkt_sk(sk); | |
1300 | struct packet_mclist *ml; | |
1301 | ||
1302 | if (!po->mclist) | |
1303 | return; | |
1304 | ||
1305 | rtnl_lock(); | |
1306 | while ((ml = po->mclist) != NULL) { | |
1307 | struct net_device *dev; | |
1308 | ||
1309 | po->mclist = ml->next; | |
1310 | if ((dev = dev_get_by_index(ml->ifindex)) != NULL) { | |
1311 | packet_dev_mc(dev, ml, -1); | |
1312 | dev_put(dev); | |
1313 | } | |
1314 | kfree(ml); | |
1315 | } | |
1316 | rtnl_unlock(); | |
1317 | } | |
1da177e4 LT |
1318 | |
1319 | static int | |
1320 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) | |
1321 | { | |
1322 | struct sock *sk = sock->sk; | |
8dc41944 | 1323 | struct packet_sock *po = pkt_sk(sk); |
1da177e4 LT |
1324 | int ret; |
1325 | ||
1326 | if (level != SOL_PACKET) | |
1327 | return -ENOPROTOOPT; | |
1328 | ||
1329 | switch(optname) { | |
1ce4f28b | 1330 | case PACKET_ADD_MEMBERSHIP: |
1da177e4 LT |
1331 | case PACKET_DROP_MEMBERSHIP: |
1332 | { | |
0fb375fb EB |
1333 | struct packet_mreq_max mreq; |
1334 | int len = optlen; | |
1335 | memset(&mreq, 0, sizeof(mreq)); | |
1336 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 1337 | return -EINVAL; |
0fb375fb EB |
1338 | if (len > sizeof(mreq)) |
1339 | len = sizeof(mreq); | |
1340 | if (copy_from_user(&mreq,optval,len)) | |
1da177e4 | 1341 | return -EFAULT; |
0fb375fb EB |
1342 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
1343 | return -EINVAL; | |
1da177e4 LT |
1344 | if (optname == PACKET_ADD_MEMBERSHIP) |
1345 | ret = packet_mc_add(sk, &mreq); | |
1346 | else | |
1347 | ret = packet_mc_drop(sk, &mreq); | |
1348 | return ret; | |
1349 | } | |
a2efcfa0 | 1350 | |
1da177e4 LT |
1351 | #ifdef CONFIG_PACKET_MMAP |
1352 | case PACKET_RX_RING: | |
1353 | { | |
1354 | struct tpacket_req req; | |
1355 | ||
1356 | if (optlen<sizeof(req)) | |
1357 | return -EINVAL; | |
1358 | if (copy_from_user(&req,optval,sizeof(req))) | |
1359 | return -EFAULT; | |
1360 | return packet_set_ring(sk, &req, 0); | |
1361 | } | |
1362 | case PACKET_COPY_THRESH: | |
1363 | { | |
1364 | int val; | |
1365 | ||
1366 | if (optlen!=sizeof(val)) | |
1367 | return -EINVAL; | |
1368 | if (copy_from_user(&val,optval,sizeof(val))) | |
1369 | return -EFAULT; | |
1370 | ||
1371 | pkt_sk(sk)->copy_thresh = val; | |
1372 | return 0; | |
1373 | } | |
1374 | #endif | |
8dc41944 HX |
1375 | case PACKET_AUXDATA: |
1376 | { | |
1377 | int val; | |
1378 | ||
1379 | if (optlen < sizeof(val)) | |
1380 | return -EINVAL; | |
1381 | if (copy_from_user(&val, optval, sizeof(val))) | |
1382 | return -EFAULT; | |
1383 | ||
1384 | po->auxdata = !!val; | |
1385 | return 0; | |
1386 | } | |
80feaacb PWJ |
1387 | case PACKET_ORIGDEV: |
1388 | { | |
1389 | int val; | |
1390 | ||
1391 | if (optlen < sizeof(val)) | |
1392 | return -EINVAL; | |
1393 | if (copy_from_user(&val, optval, sizeof(val))) | |
1394 | return -EFAULT; | |
1395 | ||
1396 | po->origdev = !!val; | |
1397 | return 0; | |
1398 | } | |
1da177e4 LT |
1399 | default: |
1400 | return -ENOPROTOOPT; | |
1401 | } | |
1402 | } | |
1403 | ||
1404 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
1405 | char __user *optval, int __user *optlen) | |
1406 | { | |
1407 | int len; | |
8dc41944 | 1408 | int val; |
1da177e4 LT |
1409 | struct sock *sk = sock->sk; |
1410 | struct packet_sock *po = pkt_sk(sk); | |
8dc41944 HX |
1411 | void *data; |
1412 | struct tpacket_stats st; | |
1da177e4 LT |
1413 | |
1414 | if (level != SOL_PACKET) | |
1415 | return -ENOPROTOOPT; | |
1416 | ||
8ae55f04 KK |
1417 | if (get_user(len, optlen)) |
1418 | return -EFAULT; | |
1da177e4 LT |
1419 | |
1420 | if (len < 0) | |
1421 | return -EINVAL; | |
1ce4f28b | 1422 | |
1da177e4 LT |
1423 | switch(optname) { |
1424 | case PACKET_STATISTICS: | |
1da177e4 LT |
1425 | if (len > sizeof(struct tpacket_stats)) |
1426 | len = sizeof(struct tpacket_stats); | |
1427 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1428 | st = po->stats; | |
1429 | memset(&po->stats, 0, sizeof(st)); | |
1430 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1431 | st.tp_packets += st.tp_drops; | |
1432 | ||
8dc41944 HX |
1433 | data = &st; |
1434 | break; | |
1435 | case PACKET_AUXDATA: | |
1436 | if (len > sizeof(int)) | |
1437 | len = sizeof(int); | |
1438 | val = po->auxdata; | |
1439 | ||
80feaacb PWJ |
1440 | data = &val; |
1441 | break; | |
1442 | case PACKET_ORIGDEV: | |
1443 | if (len > sizeof(int)) | |
1444 | len = sizeof(int); | |
1445 | val = po->origdev; | |
1446 | ||
8dc41944 | 1447 | data = &val; |
1da177e4 | 1448 | break; |
1da177e4 LT |
1449 | default: |
1450 | return -ENOPROTOOPT; | |
1451 | } | |
1452 | ||
8ae55f04 KK |
1453 | if (put_user(len, optlen)) |
1454 | return -EFAULT; | |
8dc41944 HX |
1455 | if (copy_to_user(optval, data, len)) |
1456 | return -EFAULT; | |
8ae55f04 | 1457 | return 0; |
1da177e4 LT |
1458 | } |
1459 | ||
1460 | ||
1461 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) | |
1462 | { | |
1463 | struct sock *sk; | |
1464 | struct hlist_node *node; | |
ad930650 | 1465 | struct net_device *dev = data; |
1da177e4 LT |
1466 | |
1467 | read_lock(&packet_sklist_lock); | |
1468 | sk_for_each(sk, node, &packet_sklist) { | |
1469 | struct packet_sock *po = pkt_sk(sk); | |
1470 | ||
1471 | switch (msg) { | |
1472 | case NETDEV_UNREGISTER: | |
1da177e4 LT |
1473 | if (po->mclist) |
1474 | packet_dev_mclist(dev, po->mclist, -1); | |
a2efcfa0 DM |
1475 | /* fallthrough */ |
1476 | ||
1da177e4 LT |
1477 | case NETDEV_DOWN: |
1478 | if (dev->ifindex == po->ifindex) { | |
1479 | spin_lock(&po->bind_lock); | |
1480 | if (po->running) { | |
1481 | __dev_remove_pack(&po->prot_hook); | |
1482 | __sock_put(sk); | |
1483 | po->running = 0; | |
1484 | sk->sk_err = ENETDOWN; | |
1485 | if (!sock_flag(sk, SOCK_DEAD)) | |
1486 | sk->sk_error_report(sk); | |
1487 | } | |
1488 | if (msg == NETDEV_UNREGISTER) { | |
1489 | po->ifindex = -1; | |
1490 | po->prot_hook.dev = NULL; | |
1491 | } | |
1492 | spin_unlock(&po->bind_lock); | |
1493 | } | |
1494 | break; | |
1495 | case NETDEV_UP: | |
1496 | spin_lock(&po->bind_lock); | |
1497 | if (dev->ifindex == po->ifindex && po->num && | |
1498 | !po->running) { | |
1499 | dev_add_pack(&po->prot_hook); | |
1500 | sock_hold(sk); | |
1501 | po->running = 1; | |
1502 | } | |
1503 | spin_unlock(&po->bind_lock); | |
1504 | break; | |
1505 | } | |
1506 | } | |
1507 | read_unlock(&packet_sklist_lock); | |
1508 | return NOTIFY_DONE; | |
1509 | } | |
1510 | ||
1511 | ||
1512 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
1513 | unsigned long arg) | |
1514 | { | |
1515 | struct sock *sk = sock->sk; | |
1516 | ||
1517 | switch(cmd) { | |
1518 | case SIOCOUTQ: | |
1519 | { | |
1520 | int amount = atomic_read(&sk->sk_wmem_alloc); | |
1521 | return put_user(amount, (int __user *)arg); | |
1522 | } | |
1523 | case SIOCINQ: | |
1524 | { | |
1525 | struct sk_buff *skb; | |
1526 | int amount = 0; | |
1527 | ||
1528 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1529 | skb = skb_peek(&sk->sk_receive_queue); | |
1530 | if (skb) | |
1531 | amount = skb->len; | |
1532 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1533 | return put_user(amount, (int __user *)arg); | |
1534 | } | |
1535 | case SIOCGSTAMP: | |
1536 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
ae40eb1e ED |
1537 | case SIOCGSTAMPNS: |
1538 | return sock_get_timestampns(sk, (struct timespec __user *)arg); | |
1ce4f28b | 1539 | |
1da177e4 LT |
1540 | #ifdef CONFIG_INET |
1541 | case SIOCADDRT: | |
1542 | case SIOCDELRT: | |
1543 | case SIOCDARP: | |
1544 | case SIOCGARP: | |
1545 | case SIOCSARP: | |
1546 | case SIOCGIFADDR: | |
1547 | case SIOCSIFADDR: | |
1548 | case SIOCGIFBRDADDR: | |
1549 | case SIOCSIFBRDADDR: | |
1550 | case SIOCGIFNETMASK: | |
1551 | case SIOCSIFNETMASK: | |
1552 | case SIOCGIFDSTADDR: | |
1553 | case SIOCSIFDSTADDR: | |
1554 | case SIOCSIFFLAGS: | |
1555 | return inet_dgram_ops.ioctl(sock, cmd, arg); | |
1556 | #endif | |
1557 | ||
1558 | default: | |
b5e5fa5e | 1559 | return -ENOIOCTLCMD; |
1da177e4 LT |
1560 | } |
1561 | return 0; | |
1562 | } | |
1563 | ||
1564 | #ifndef CONFIG_PACKET_MMAP | |
1565 | #define packet_mmap sock_no_mmap | |
1566 | #define packet_poll datagram_poll | |
1567 | #else | |
1568 | ||
1569 | static unsigned int packet_poll(struct file * file, struct socket *sock, | |
1570 | poll_table *wait) | |
1571 | { | |
1572 | struct sock *sk = sock->sk; | |
1573 | struct packet_sock *po = pkt_sk(sk); | |
1574 | unsigned int mask = datagram_poll(file, sock, wait); | |
1575 | ||
1576 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1577 | if (po->pg_vec) { | |
1578 | unsigned last = po->head ? po->head-1 : po->frame_max; | |
1579 | struct tpacket_hdr *h; | |
1580 | ||
ad930650 | 1581 | h = packet_lookup_frame(po, last); |
1da177e4 LT |
1582 | |
1583 | if (h->tp_status) | |
1584 | mask |= POLLIN | POLLRDNORM; | |
1585 | } | |
1586 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1587 | return mask; | |
1588 | } | |
1589 | ||
1590 | ||
1591 | /* Dirty? Well, I still did not learn better way to account | |
1592 | * for user mmaps. | |
1593 | */ | |
1594 | ||
1595 | static void packet_mm_open(struct vm_area_struct *vma) | |
1596 | { | |
1597 | struct file *file = vma->vm_file; | |
b69aee04 | 1598 | struct socket * sock = file->private_data; |
1da177e4 | 1599 | struct sock *sk = sock->sk; |
1ce4f28b | 1600 | |
1da177e4 LT |
1601 | if (sk) |
1602 | atomic_inc(&pkt_sk(sk)->mapped); | |
1603 | } | |
1604 | ||
1605 | static void packet_mm_close(struct vm_area_struct *vma) | |
1606 | { | |
1607 | struct file *file = vma->vm_file; | |
b69aee04 | 1608 | struct socket * sock = file->private_data; |
1da177e4 | 1609 | struct sock *sk = sock->sk; |
1ce4f28b | 1610 | |
1da177e4 LT |
1611 | if (sk) |
1612 | atomic_dec(&pkt_sk(sk)->mapped); | |
1613 | } | |
1614 | ||
1615 | static struct vm_operations_struct packet_mmap_ops = { | |
1616 | .open = packet_mm_open, | |
1617 | .close =packet_mm_close, | |
1618 | }; | |
1619 | ||
1620 | static inline struct page *pg_vec_endpage(char *one_pg_vec, unsigned int order) | |
1621 | { | |
1622 | return virt_to_page(one_pg_vec + (PAGE_SIZE << order) - 1); | |
1623 | } | |
1624 | ||
4ebf0ae2 | 1625 | static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len) |
1da177e4 LT |
1626 | { |
1627 | int i; | |
1628 | ||
4ebf0ae2 DM |
1629 | for (i = 0; i < len; i++) { |
1630 | if (likely(pg_vec[i])) | |
1631 | free_pages((unsigned long) pg_vec[i], order); | |
1da177e4 LT |
1632 | } |
1633 | kfree(pg_vec); | |
1634 | } | |
1635 | ||
4ebf0ae2 DM |
1636 | static inline char *alloc_one_pg_vec_page(unsigned long order) |
1637 | { | |
1638 | return (char *) __get_free_pages(GFP_KERNEL | __GFP_COMP | __GFP_ZERO, | |
1639 | order); | |
1640 | } | |
1641 | ||
1642 | static char **alloc_pg_vec(struct tpacket_req *req, int order) | |
1643 | { | |
1644 | unsigned int block_nr = req->tp_block_nr; | |
1645 | char **pg_vec; | |
1646 | int i; | |
1647 | ||
1648 | pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL); | |
1649 | if (unlikely(!pg_vec)) | |
1650 | goto out; | |
1651 | ||
1652 | for (i = 0; i < block_nr; i++) { | |
1653 | pg_vec[i] = alloc_one_pg_vec_page(order); | |
1654 | if (unlikely(!pg_vec[i])) | |
1655 | goto out_free_pgvec; | |
1656 | } | |
1657 | ||
1658 | out: | |
1659 | return pg_vec; | |
1660 | ||
1661 | out_free_pgvec: | |
1662 | free_pg_vec(pg_vec, order, block_nr); | |
1663 | pg_vec = NULL; | |
1664 | goto out; | |
1665 | } | |
1da177e4 LT |
1666 | |
1667 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing) | |
1668 | { | |
1669 | char **pg_vec = NULL; | |
1670 | struct packet_sock *po = pkt_sk(sk); | |
0e11c91e AV |
1671 | int was_running, order = 0; |
1672 | __be16 num; | |
1da177e4 | 1673 | int err = 0; |
1ce4f28b | 1674 | |
1da177e4 LT |
1675 | if (req->tp_block_nr) { |
1676 | int i, l; | |
1677 | ||
1678 | /* Sanity tests and some calculations */ | |
1679 | ||
4ebf0ae2 | 1680 | if (unlikely(po->pg_vec)) |
1da177e4 LT |
1681 | return -EBUSY; |
1682 | ||
4ebf0ae2 | 1683 | if (unlikely((int)req->tp_block_size <= 0)) |
1da177e4 | 1684 | return -EINVAL; |
4ebf0ae2 | 1685 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
1da177e4 | 1686 | return -EINVAL; |
4ebf0ae2 | 1687 | if (unlikely(req->tp_frame_size < TPACKET_HDRLEN)) |
1da177e4 | 1688 | return -EINVAL; |
4ebf0ae2 | 1689 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
1da177e4 LT |
1690 | return -EINVAL; |
1691 | ||
1692 | po->frames_per_block = req->tp_block_size/req->tp_frame_size; | |
4ebf0ae2 | 1693 | if (unlikely(po->frames_per_block <= 0)) |
1da177e4 | 1694 | return -EINVAL; |
4ebf0ae2 DM |
1695 | if (unlikely((po->frames_per_block * req->tp_block_nr) != |
1696 | req->tp_frame_nr)) | |
1da177e4 | 1697 | return -EINVAL; |
1da177e4 LT |
1698 | |
1699 | err = -ENOMEM; | |
4ebf0ae2 DM |
1700 | order = get_order(req->tp_block_size); |
1701 | pg_vec = alloc_pg_vec(req, order); | |
1702 | if (unlikely(!pg_vec)) | |
1da177e4 | 1703 | goto out; |
1da177e4 LT |
1704 | |
1705 | l = 0; | |
4ebf0ae2 | 1706 | for (i = 0; i < req->tp_block_nr; i++) { |
1da177e4 LT |
1707 | char *ptr = pg_vec[i]; |
1708 | struct tpacket_hdr *header; | |
1709 | int k; | |
1710 | ||
4ebf0ae2 DM |
1711 | for (k = 0; k < po->frames_per_block; k++) { |
1712 | header = (struct tpacket_hdr *) ptr; | |
1da177e4 LT |
1713 | header->tp_status = TP_STATUS_KERNEL; |
1714 | ptr += req->tp_frame_size; | |
1715 | } | |
1716 | } | |
1717 | /* Done */ | |
1718 | } else { | |
4ebf0ae2 | 1719 | if (unlikely(req->tp_frame_nr)) |
1da177e4 LT |
1720 | return -EINVAL; |
1721 | } | |
1722 | ||
1723 | lock_sock(sk); | |
1724 | ||
1725 | /* Detach socket from network */ | |
1726 | spin_lock(&po->bind_lock); | |
1727 | was_running = po->running; | |
1728 | num = po->num; | |
1729 | if (was_running) { | |
1730 | __dev_remove_pack(&po->prot_hook); | |
1731 | po->num = 0; | |
1732 | po->running = 0; | |
1733 | __sock_put(sk); | |
1734 | } | |
1735 | spin_unlock(&po->bind_lock); | |
1ce4f28b | 1736 | |
1da177e4 LT |
1737 | synchronize_net(); |
1738 | ||
1739 | err = -EBUSY; | |
1740 | if (closing || atomic_read(&po->mapped) == 0) { | |
1741 | err = 0; | |
1742 | #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) | |
1743 | ||
1744 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
1745 | pg_vec = XC(po->pg_vec, pg_vec); | |
4ebf0ae2 | 1746 | po->frame_max = (req->tp_frame_nr - 1); |
1da177e4 LT |
1747 | po->head = 0; |
1748 | po->frame_size = req->tp_frame_size; | |
1749 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
1750 | ||
1751 | order = XC(po->pg_vec_order, order); | |
1752 | req->tp_block_nr = XC(po->pg_vec_len, req->tp_block_nr); | |
1753 | ||
1754 | po->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
1755 | po->prot_hook.func = po->pg_vec ? tpacket_rcv : packet_rcv; | |
1756 | skb_queue_purge(&sk->sk_receive_queue); | |
1757 | #undef XC | |
1758 | if (atomic_read(&po->mapped)) | |
1759 | printk(KERN_DEBUG "packet_mmap: vma is busy: %d\n", atomic_read(&po->mapped)); | |
1760 | } | |
1761 | ||
1762 | spin_lock(&po->bind_lock); | |
1763 | if (was_running && !po->running) { | |
1764 | sock_hold(sk); | |
1765 | po->running = 1; | |
1766 | po->num = num; | |
1767 | dev_add_pack(&po->prot_hook); | |
1768 | } | |
1769 | spin_unlock(&po->bind_lock); | |
1770 | ||
1771 | release_sock(sk); | |
1772 | ||
1da177e4 LT |
1773 | if (pg_vec) |
1774 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
1775 | out: | |
1776 | return err; | |
1777 | } | |
1778 | ||
1779 | static int packet_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
1780 | { | |
1781 | struct sock *sk = sock->sk; | |
1782 | struct packet_sock *po = pkt_sk(sk); | |
1783 | unsigned long size; | |
1784 | unsigned long start; | |
1785 | int err = -EINVAL; | |
1786 | int i; | |
1787 | ||
1788 | if (vma->vm_pgoff) | |
1789 | return -EINVAL; | |
1790 | ||
1791 | size = vma->vm_end - vma->vm_start; | |
1792 | ||
1793 | lock_sock(sk); | |
1794 | if (po->pg_vec == NULL) | |
1795 | goto out; | |
1796 | if (size != po->pg_vec_len*po->pg_vec_pages*PAGE_SIZE) | |
1797 | goto out; | |
1798 | ||
1da177e4 | 1799 | start = vma->vm_start; |
4ebf0ae2 DM |
1800 | for (i = 0; i < po->pg_vec_len; i++) { |
1801 | struct page *page = virt_to_page(po->pg_vec[i]); | |
1802 | int pg_num; | |
1803 | ||
1804 | for (pg_num = 0; pg_num < po->pg_vec_pages; pg_num++, page++) { | |
1805 | err = vm_insert_page(vma, start, page); | |
1806 | if (unlikely(err)) | |
1807 | goto out; | |
1808 | start += PAGE_SIZE; | |
1809 | } | |
1da177e4 | 1810 | } |
4ebf0ae2 | 1811 | atomic_inc(&po->mapped); |
1da177e4 LT |
1812 | vma->vm_ops = &packet_mmap_ops; |
1813 | err = 0; | |
1814 | ||
1815 | out: | |
1816 | release_sock(sk); | |
1817 | return err; | |
1818 | } | |
1819 | #endif | |
1820 | ||
1821 | ||
90ddc4f0 | 1822 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
1823 | .family = PF_PACKET, |
1824 | .owner = THIS_MODULE, | |
1825 | .release = packet_release, | |
1826 | .bind = packet_bind_spkt, | |
1827 | .connect = sock_no_connect, | |
1828 | .socketpair = sock_no_socketpair, | |
1829 | .accept = sock_no_accept, | |
1830 | .getname = packet_getname_spkt, | |
1831 | .poll = datagram_poll, | |
1832 | .ioctl = packet_ioctl, | |
1833 | .listen = sock_no_listen, | |
1834 | .shutdown = sock_no_shutdown, | |
1835 | .setsockopt = sock_no_setsockopt, | |
1836 | .getsockopt = sock_no_getsockopt, | |
1837 | .sendmsg = packet_sendmsg_spkt, | |
1838 | .recvmsg = packet_recvmsg, | |
1839 | .mmap = sock_no_mmap, | |
1840 | .sendpage = sock_no_sendpage, | |
1841 | }; | |
1da177e4 | 1842 | |
90ddc4f0 | 1843 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
1844 | .family = PF_PACKET, |
1845 | .owner = THIS_MODULE, | |
1846 | .release = packet_release, | |
1847 | .bind = packet_bind, | |
1848 | .connect = sock_no_connect, | |
1849 | .socketpair = sock_no_socketpair, | |
1850 | .accept = sock_no_accept, | |
1ce4f28b | 1851 | .getname = packet_getname, |
1da177e4 LT |
1852 | .poll = packet_poll, |
1853 | .ioctl = packet_ioctl, | |
1854 | .listen = sock_no_listen, | |
1855 | .shutdown = sock_no_shutdown, | |
1856 | .setsockopt = packet_setsockopt, | |
1857 | .getsockopt = packet_getsockopt, | |
1858 | .sendmsg = packet_sendmsg, | |
1859 | .recvmsg = packet_recvmsg, | |
1860 | .mmap = packet_mmap, | |
1861 | .sendpage = sock_no_sendpage, | |
1862 | }; | |
1863 | ||
1864 | static struct net_proto_family packet_family_ops = { | |
1865 | .family = PF_PACKET, | |
1866 | .create = packet_create, | |
1867 | .owner = THIS_MODULE, | |
1868 | }; | |
1869 | ||
1870 | static struct notifier_block packet_netdev_notifier = { | |
1871 | .notifier_call =packet_notifier, | |
1872 | }; | |
1873 | ||
1874 | #ifdef CONFIG_PROC_FS | |
1875 | static inline struct sock *packet_seq_idx(loff_t off) | |
1876 | { | |
1877 | struct sock *s; | |
1878 | struct hlist_node *node; | |
1879 | ||
1880 | sk_for_each(s, node, &packet_sklist) { | |
1881 | if (!off--) | |
1882 | return s; | |
1883 | } | |
1884 | return NULL; | |
1885 | } | |
1886 | ||
1887 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
1888 | { | |
1889 | read_lock(&packet_sklist_lock); | |
1890 | return *pos ? packet_seq_idx(*pos - 1) : SEQ_START_TOKEN; | |
1891 | } | |
1892 | ||
1893 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1894 | { | |
1895 | ++*pos; | |
1ce4f28b YH |
1896 | return (v == SEQ_START_TOKEN) |
1897 | ? sk_head(&packet_sklist) | |
1da177e4 LT |
1898 | : sk_next((struct sock*)v) ; |
1899 | } | |
1900 | ||
1901 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
1902 | { | |
1ce4f28b | 1903 | read_unlock(&packet_sklist_lock); |
1da177e4 LT |
1904 | } |
1905 | ||
1ce4f28b | 1906 | static int packet_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
1907 | { |
1908 | if (v == SEQ_START_TOKEN) | |
1909 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
1910 | else { | |
1911 | struct sock *s = v; | |
1912 | const struct packet_sock *po = pkt_sk(s); | |
1913 | ||
1914 | seq_printf(seq, | |
1915 | "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", | |
1916 | s, | |
1917 | atomic_read(&s->sk_refcnt), | |
1918 | s->sk_type, | |
1919 | ntohs(po->num), | |
1920 | po->ifindex, | |
1921 | po->running, | |
1922 | atomic_read(&s->sk_rmem_alloc), | |
1923 | sock_i_uid(s), | |
1924 | sock_i_ino(s) ); | |
1925 | } | |
1926 | ||
1927 | return 0; | |
1928 | } | |
1929 | ||
56b3d975 | 1930 | static const struct seq_operations packet_seq_ops = { |
1da177e4 LT |
1931 | .start = packet_seq_start, |
1932 | .next = packet_seq_next, | |
1933 | .stop = packet_seq_stop, | |
1934 | .show = packet_seq_show, | |
1935 | }; | |
1936 | ||
1937 | static int packet_seq_open(struct inode *inode, struct file *file) | |
1938 | { | |
1939 | return seq_open(file, &packet_seq_ops); | |
1940 | } | |
1941 | ||
da7071d7 | 1942 | static const struct file_operations packet_seq_fops = { |
1da177e4 LT |
1943 | .owner = THIS_MODULE, |
1944 | .open = packet_seq_open, | |
1945 | .read = seq_read, | |
1946 | .llseek = seq_lseek, | |
1947 | .release = seq_release, | |
1948 | }; | |
1949 | ||
1950 | #endif | |
1951 | ||
1952 | static void __exit packet_exit(void) | |
1953 | { | |
1954 | proc_net_remove("packet"); | |
1955 | unregister_netdevice_notifier(&packet_netdev_notifier); | |
1956 | sock_unregister(PF_PACKET); | |
1957 | proto_unregister(&packet_proto); | |
1958 | } | |
1959 | ||
1960 | static int __init packet_init(void) | |
1961 | { | |
1962 | int rc = proto_register(&packet_proto, 0); | |
1963 | ||
1964 | if (rc != 0) | |
1965 | goto out; | |
1966 | ||
1967 | sock_register(&packet_family_ops); | |
1968 | register_netdevice_notifier(&packet_netdev_notifier); | |
1969 | proc_net_fops_create("packet", 0, &packet_seq_fops); | |
1970 | out: | |
1971 | return rc; | |
1972 | } | |
1973 | ||
1974 | module_init(packet_init); | |
1975 | module_exit(packet_exit); | |
1976 | MODULE_LICENSE("GPL"); | |
1977 | MODULE_ALIAS_NETPROTO(PF_PACKET); |