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 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
11 | * | |
1ce4f28b | 12 | * Fixes: |
1da177e4 LT |
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. | |
1ce4f28b | 35 | * Ulises Alonso : Frame number limit removal and |
1da177e4 | 36 | * packet_set_ring memory leak. |
0fb375fb EB |
37 | * Eric Biederman : Allow for > 8 byte hardware addresses. |
38 | * The convention is that longer addresses | |
39 | * will simply extend the hardware address | |
1ce4f28b | 40 | * byte arrays at the end of sockaddr_ll |
0fb375fb | 41 | * and packet_mreq. |
69e3c75f | 42 | * Johann Baudy : Added TX RING. |
1da177e4 LT |
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 | */ | |
1ce4f28b | 50 | |
1da177e4 | 51 | #include <linux/types.h> |
1da177e4 | 52 | #include <linux/mm.h> |
4fc268d2 | 53 | #include <linux/capability.h> |
1da177e4 LT |
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> | |
ffbc6111 | 61 | #include <linux/kernel.h> |
1da177e4 | 62 | #include <linux/kmod.h> |
5a0e3ad6 | 63 | #include <linux/slab.h> |
0e3125c7 | 64 | #include <linux/vmalloc.h> |
457c4cbc | 65 | #include <net/net_namespace.h> |
1da177e4 LT |
66 | #include <net/ip.h> |
67 | #include <net/protocol.h> | |
68 | #include <linux/skbuff.h> | |
69 | #include <net/sock.h> | |
70 | #include <linux/errno.h> | |
71 | #include <linux/timer.h> | |
72 | #include <asm/system.h> | |
73 | #include <asm/uaccess.h> | |
74 | #include <asm/ioctls.h> | |
75 | #include <asm/page.h> | |
a1f8e7f7 | 76 | #include <asm/cacheflush.h> |
1da177e4 LT |
77 | #include <asm/io.h> |
78 | #include <linux/proc_fs.h> | |
79 | #include <linux/seq_file.h> | |
80 | #include <linux/poll.h> | |
81 | #include <linux/module.h> | |
82 | #include <linux/init.h> | |
905db440 | 83 | #include <linux/mutex.h> |
05423b24 | 84 | #include <linux/if_vlan.h> |
bfd5f4a3 | 85 | #include <linux/virtio_net.h> |
ed85b565 | 86 | #include <linux/errqueue.h> |
614f60fa | 87 | #include <linux/net_tstamp.h> |
1da177e4 LT |
88 | |
89 | #ifdef CONFIG_INET | |
90 | #include <net/inet_common.h> | |
91 | #endif | |
92 | ||
1da177e4 LT |
93 | /* |
94 | Assumptions: | |
95 | - if device has no dev->hard_header routine, it adds and removes ll header | |
96 | inside itself. In this case ll header is invisible outside of device, | |
97 | but higher levels still should reserve dev->hard_header_len. | |
98 | Some devices are enough clever to reallocate skb, when header | |
99 | will not fit to reserved space (tunnel), another ones are silly | |
100 | (PPP). | |
101 | - packet socket receives packets with pulled ll header, | |
102 | so that SOCK_RAW should push it back. | |
103 | ||
104 | On receive: | |
105 | ----------- | |
106 | ||
107 | Incoming, dev->hard_header!=NULL | |
b0e380b1 ACM |
108 | mac_header -> ll header |
109 | data -> data | |
1da177e4 LT |
110 | |
111 | Outgoing, dev->hard_header!=NULL | |
b0e380b1 ACM |
112 | mac_header -> ll header |
113 | data -> ll header | |
1da177e4 LT |
114 | |
115 | Incoming, dev->hard_header==NULL | |
b0e380b1 ACM |
116 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
117 | header. PPP makes it, that is wrong, because introduce | |
db0c58f9 | 118 | assymetry between rx and tx paths. |
b0e380b1 | 119 | data -> data |
1da177e4 LT |
120 | |
121 | Outgoing, dev->hard_header==NULL | |
b0e380b1 ACM |
122 | mac_header -> data. ll header is still not built! |
123 | data -> data | |
1da177e4 LT |
124 | |
125 | Resume | |
126 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. | |
127 | ||
128 | ||
129 | On transmit: | |
130 | ------------ | |
131 | ||
132 | dev->hard_header != NULL | |
b0e380b1 ACM |
133 | mac_header -> ll header |
134 | data -> ll header | |
1da177e4 LT |
135 | |
136 | dev->hard_header == NULL (ll header is added by device, we cannot control it) | |
b0e380b1 ACM |
137 | mac_header -> data |
138 | data -> data | |
1da177e4 LT |
139 | |
140 | We should set nh.raw on output to correct posistion, | |
141 | packet classifier depends on it. | |
142 | */ | |
143 | ||
1da177e4 LT |
144 | /* Private packet socket structures. */ |
145 | ||
40d4e3df | 146 | struct packet_mclist { |
1da177e4 LT |
147 | struct packet_mclist *next; |
148 | int ifindex; | |
149 | int count; | |
150 | unsigned short type; | |
151 | unsigned short alen; | |
0fb375fb EB |
152 | unsigned char addr[MAX_ADDR_LEN]; |
153 | }; | |
154 | /* identical to struct packet_mreq except it has | |
155 | * a longer address field. | |
156 | */ | |
40d4e3df | 157 | struct packet_mreq_max { |
0fb375fb EB |
158 | int mr_ifindex; |
159 | unsigned short mr_type; | |
160 | unsigned short mr_alen; | |
161 | unsigned char mr_address[MAX_ADDR_LEN]; | |
1da177e4 | 162 | }; |
a2efcfa0 | 163 | |
69e3c75f JB |
164 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
165 | int closing, int tx_ring); | |
166 | ||
0e3125c7 NH |
167 | #define PGV_FROM_VMALLOC 1 |
168 | struct pgv { | |
169 | char *buffer; | |
0e3125c7 NH |
170 | }; |
171 | ||
69e3c75f | 172 | struct packet_ring_buffer { |
0e3125c7 | 173 | struct pgv *pg_vec; |
69e3c75f JB |
174 | unsigned int head; |
175 | unsigned int frames_per_block; | |
176 | unsigned int frame_size; | |
177 | unsigned int frame_max; | |
178 | ||
179 | unsigned int pg_vec_order; | |
180 | unsigned int pg_vec_pages; | |
181 | unsigned int pg_vec_len; | |
182 | ||
183 | atomic_t pending; | |
184 | }; | |
185 | ||
186 | struct packet_sock; | |
187 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg); | |
1da177e4 LT |
188 | |
189 | static void packet_flush_mclist(struct sock *sk); | |
190 | ||
191 | struct packet_sock { | |
192 | /* struct sock has to be the first member of packet_sock */ | |
193 | struct sock sk; | |
194 | struct tpacket_stats stats; | |
69e3c75f JB |
195 | struct packet_ring_buffer rx_ring; |
196 | struct packet_ring_buffer tx_ring; | |
1da177e4 | 197 | int copy_thresh; |
1da177e4 | 198 | spinlock_t bind_lock; |
905db440 | 199 | struct mutex pg_vec_lock; |
8dc41944 | 200 | unsigned int running:1, /* prot_hook is attached*/ |
80feaacb | 201 | auxdata:1, |
bfd5f4a3 SS |
202 | origdev:1, |
203 | has_vnet_hdr:1; | |
1da177e4 | 204 | int ifindex; /* bound device */ |
0e11c91e | 205 | __be16 num; |
1da177e4 | 206 | struct packet_mclist *mclist; |
1da177e4 | 207 | atomic_t mapped; |
bbd6ef87 PM |
208 | enum tpacket_versions tp_version; |
209 | unsigned int tp_hdrlen; | |
8913336a | 210 | unsigned int tp_reserve; |
69e3c75f | 211 | unsigned int tp_loss:1; |
614f60fa | 212 | unsigned int tp_tstamp; |
94b05952 | 213 | struct packet_type prot_hook ____cacheline_aligned_in_smp; |
1da177e4 LT |
214 | }; |
215 | ||
ffbc6111 HX |
216 | struct packet_skb_cb { |
217 | unsigned int origlen; | |
218 | union { | |
219 | struct sockaddr_pkt pkt; | |
220 | struct sockaddr_ll ll; | |
221 | } sa; | |
222 | }; | |
223 | ||
224 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) | |
8dc41944 | 225 | |
f6dafa95 | 226 | static inline __pure struct page *pgv_to_page(void *addr) |
0af55bb5 CG |
227 | { |
228 | if (is_vmalloc_addr(addr)) | |
229 | return vmalloc_to_page(addr); | |
230 | return virt_to_page(addr); | |
231 | } | |
232 | ||
69e3c75f | 233 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
1da177e4 | 234 | { |
bbd6ef87 PM |
235 | union { |
236 | struct tpacket_hdr *h1; | |
237 | struct tpacket2_hdr *h2; | |
238 | void *raw; | |
239 | } h; | |
1da177e4 | 240 | |
69e3c75f | 241 | h.raw = frame; |
bbd6ef87 PM |
242 | switch (po->tp_version) { |
243 | case TPACKET_V1: | |
69e3c75f | 244 | h.h1->tp_status = status; |
0af55bb5 | 245 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
bbd6ef87 PM |
246 | break; |
247 | case TPACKET_V2: | |
69e3c75f | 248 | h.h2->tp_status = status; |
0af55bb5 | 249 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
bbd6ef87 | 250 | break; |
69e3c75f | 251 | default: |
40d4e3df | 252 | pr_err("TPACKET version not supported\n"); |
69e3c75f | 253 | BUG(); |
bbd6ef87 | 254 | } |
69e3c75f JB |
255 | |
256 | smp_wmb(); | |
bbd6ef87 PM |
257 | } |
258 | ||
69e3c75f | 259 | static int __packet_get_status(struct packet_sock *po, void *frame) |
bbd6ef87 PM |
260 | { |
261 | union { | |
262 | struct tpacket_hdr *h1; | |
263 | struct tpacket2_hdr *h2; | |
264 | void *raw; | |
265 | } h; | |
266 | ||
69e3c75f JB |
267 | smp_rmb(); |
268 | ||
bbd6ef87 PM |
269 | h.raw = frame; |
270 | switch (po->tp_version) { | |
271 | case TPACKET_V1: | |
0af55bb5 | 272 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
69e3c75f | 273 | return h.h1->tp_status; |
bbd6ef87 | 274 | case TPACKET_V2: |
0af55bb5 | 275 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
69e3c75f JB |
276 | return h.h2->tp_status; |
277 | default: | |
40d4e3df | 278 | pr_err("TPACKET version not supported\n"); |
69e3c75f JB |
279 | BUG(); |
280 | return 0; | |
bbd6ef87 | 281 | } |
1da177e4 | 282 | } |
69e3c75f JB |
283 | |
284 | static void *packet_lookup_frame(struct packet_sock *po, | |
285 | struct packet_ring_buffer *rb, | |
286 | unsigned int position, | |
287 | int status) | |
288 | { | |
289 | unsigned int pg_vec_pos, frame_offset; | |
290 | union { | |
291 | struct tpacket_hdr *h1; | |
292 | struct tpacket2_hdr *h2; | |
293 | void *raw; | |
294 | } h; | |
295 | ||
296 | pg_vec_pos = position / rb->frames_per_block; | |
297 | frame_offset = position % rb->frames_per_block; | |
298 | ||
0e3125c7 NH |
299 | h.raw = rb->pg_vec[pg_vec_pos].buffer + |
300 | (frame_offset * rb->frame_size); | |
69e3c75f JB |
301 | |
302 | if (status != __packet_get_status(po, h.raw)) | |
303 | return NULL; | |
304 | ||
305 | return h.raw; | |
306 | } | |
307 | ||
308 | static inline void *packet_current_frame(struct packet_sock *po, | |
309 | struct packet_ring_buffer *rb, | |
310 | int status) | |
311 | { | |
312 | return packet_lookup_frame(po, rb, rb->head, status); | |
313 | } | |
314 | ||
315 | static inline void *packet_previous_frame(struct packet_sock *po, | |
316 | struct packet_ring_buffer *rb, | |
317 | int status) | |
318 | { | |
319 | unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; | |
320 | return packet_lookup_frame(po, rb, previous, status); | |
321 | } | |
322 | ||
323 | static inline void packet_increment_head(struct packet_ring_buffer *buff) | |
324 | { | |
325 | buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; | |
326 | } | |
327 | ||
1da177e4 LT |
328 | static inline struct packet_sock *pkt_sk(struct sock *sk) |
329 | { | |
330 | return (struct packet_sock *)sk; | |
331 | } | |
332 | ||
333 | static void packet_sock_destruct(struct sock *sk) | |
334 | { | |
ed85b565 RC |
335 | skb_queue_purge(&sk->sk_error_queue); |
336 | ||
547b792c IJ |
337 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
338 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); | |
1da177e4 LT |
339 | |
340 | if (!sock_flag(sk, SOCK_DEAD)) { | |
40d4e3df | 341 | pr_err("Attempt to release alive packet socket: %p\n", sk); |
1da177e4 LT |
342 | return; |
343 | } | |
344 | ||
17ab56a2 | 345 | sk_refcnt_debug_dec(sk); |
1da177e4 LT |
346 | } |
347 | ||
348 | ||
90ddc4f0 | 349 | static const struct proto_ops packet_ops; |
1da177e4 | 350 | |
90ddc4f0 | 351 | static const struct proto_ops packet_ops_spkt; |
1da177e4 | 352 | |
40d4e3df ED |
353 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
354 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
355 | { |
356 | struct sock *sk; | |
357 | struct sockaddr_pkt *spkt; | |
358 | ||
359 | /* | |
360 | * When we registered the protocol we saved the socket in the data | |
361 | * field for just this event. | |
362 | */ | |
363 | ||
364 | sk = pt->af_packet_priv; | |
1ce4f28b | 365 | |
1da177e4 LT |
366 | /* |
367 | * Yank back the headers [hope the device set this | |
368 | * right or kerboom...] | |
369 | * | |
370 | * Incoming packets have ll header pulled, | |
371 | * push it back. | |
372 | * | |
98e399f8 | 373 | * For outgoing ones skb->data == skb_mac_header(skb) |
1da177e4 LT |
374 | * so that this procedure is noop. |
375 | */ | |
376 | ||
377 | if (skb->pkt_type == PACKET_LOOPBACK) | |
378 | goto out; | |
379 | ||
09ad9bc7 | 380 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
381 | goto out; |
382 | ||
40d4e3df ED |
383 | skb = skb_share_check(skb, GFP_ATOMIC); |
384 | if (skb == NULL) | |
1da177e4 LT |
385 | goto oom; |
386 | ||
387 | /* drop any routing info */ | |
adf30907 | 388 | skb_dst_drop(skb); |
1da177e4 | 389 | |
84531c24 PO |
390 | /* drop conntrack reference */ |
391 | nf_reset(skb); | |
392 | ||
ffbc6111 | 393 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
1da177e4 | 394 | |
98e399f8 | 395 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
396 | |
397 | /* | |
398 | * The SOCK_PACKET socket receives _all_ frames. | |
399 | */ | |
400 | ||
401 | spkt->spkt_family = dev->type; | |
402 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
403 | spkt->spkt_protocol = skb->protocol; | |
404 | ||
405 | /* | |
406 | * Charge the memory to the socket. This is done specifically | |
407 | * to prevent sockets using all the memory up. | |
408 | */ | |
409 | ||
40d4e3df | 410 | if (sock_queue_rcv_skb(sk, skb) == 0) |
1da177e4 LT |
411 | return 0; |
412 | ||
413 | out: | |
414 | kfree_skb(skb); | |
415 | oom: | |
416 | return 0; | |
417 | } | |
418 | ||
419 | ||
420 | /* | |
421 | * Output a raw packet to a device layer. This bypasses all the other | |
422 | * protocol layers and you must therefore supply it with a complete frame | |
423 | */ | |
1ce4f28b | 424 | |
1da177e4 LT |
425 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, |
426 | struct msghdr *msg, size_t len) | |
427 | { | |
428 | struct sock *sk = sock->sk; | |
40d4e3df | 429 | struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name; |
1a35ca80 | 430 | struct sk_buff *skb = NULL; |
1da177e4 | 431 | struct net_device *dev; |
40d4e3df | 432 | __be16 proto = 0; |
1da177e4 | 433 | int err; |
1ce4f28b | 434 | |
1da177e4 | 435 | /* |
1ce4f28b | 436 | * Get and verify the address. |
1da177e4 LT |
437 | */ |
438 | ||
40d4e3df | 439 | if (saddr) { |
1da177e4 | 440 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
40d4e3df ED |
441 | return -EINVAL; |
442 | if (msg->msg_namelen == sizeof(struct sockaddr_pkt)) | |
443 | proto = saddr->spkt_protocol; | |
444 | } else | |
445 | return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */ | |
1da177e4 LT |
446 | |
447 | /* | |
1ce4f28b | 448 | * Find the device first to size check it |
1da177e4 LT |
449 | */ |
450 | ||
451 | saddr->spkt_device[13] = 0; | |
1a35ca80 | 452 | retry: |
654d1f8a ED |
453 | rcu_read_lock(); |
454 | dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); | |
1da177e4 LT |
455 | err = -ENODEV; |
456 | if (dev == NULL) | |
457 | goto out_unlock; | |
1ce4f28b | 458 | |
d5e76b0a DM |
459 | err = -ENETDOWN; |
460 | if (!(dev->flags & IFF_UP)) | |
461 | goto out_unlock; | |
462 | ||
1da177e4 | 463 | /* |
40d4e3df ED |
464 | * You may not queue a frame bigger than the mtu. This is the lowest level |
465 | * raw protocol and you must do your own fragmentation at this level. | |
1da177e4 | 466 | */ |
1ce4f28b | 467 | |
1da177e4 | 468 | err = -EMSGSIZE; |
8ae55f04 | 469 | if (len > dev->mtu + dev->hard_header_len) |
1da177e4 LT |
470 | goto out_unlock; |
471 | ||
1a35ca80 ED |
472 | if (!skb) { |
473 | size_t reserved = LL_RESERVED_SPACE(dev); | |
474 | unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0; | |
475 | ||
476 | rcu_read_unlock(); | |
477 | skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL); | |
478 | if (skb == NULL) | |
479 | return -ENOBUFS; | |
480 | /* FIXME: Save some space for broken drivers that write a hard | |
481 | * header at transmission time by themselves. PPP is the notable | |
482 | * one here. This should really be fixed at the driver level. | |
483 | */ | |
484 | skb_reserve(skb, reserved); | |
485 | skb_reset_network_header(skb); | |
486 | ||
487 | /* Try to align data part correctly */ | |
488 | if (hhlen) { | |
489 | skb->data -= hhlen; | |
490 | skb->tail -= hhlen; | |
491 | if (len < hhlen) | |
492 | skb_reset_network_header(skb); | |
493 | } | |
494 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
495 | if (err) | |
496 | goto out_free; | |
497 | goto retry; | |
1da177e4 LT |
498 | } |
499 | ||
1a35ca80 | 500 | |
1da177e4 LT |
501 | skb->protocol = proto; |
502 | skb->dev = dev; | |
503 | skb->priority = sk->sk_priority; | |
2d37a186 | 504 | skb->mark = sk->sk_mark; |
2244d07b | 505 | err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
ed85b565 RC |
506 | if (err < 0) |
507 | goto out_unlock; | |
1da177e4 LT |
508 | |
509 | dev_queue_xmit(skb); | |
654d1f8a | 510 | rcu_read_unlock(); |
40d4e3df | 511 | return len; |
1da177e4 | 512 | |
1da177e4 | 513 | out_unlock: |
654d1f8a | 514 | rcu_read_unlock(); |
1a35ca80 ED |
515 | out_free: |
516 | kfree_skb(skb); | |
1da177e4 LT |
517 | return err; |
518 | } | |
1da177e4 | 519 | |
62ab0812 ED |
520 | static inline unsigned int run_filter(const struct sk_buff *skb, |
521 | const struct sock *sk, | |
dbcb5855 | 522 | unsigned int res) |
1da177e4 LT |
523 | { |
524 | struct sk_filter *filter; | |
fda9ef5d DM |
525 | |
526 | rcu_read_lock_bh(); | |
a898def2 | 527 | filter = rcu_dereference_bh(sk->sk_filter); |
dbcb5855 | 528 | if (filter != NULL) |
93aaae2e | 529 | res = sk_run_filter(skb, filter->insns); |
fda9ef5d | 530 | rcu_read_unlock_bh(); |
1da177e4 | 531 | |
dbcb5855 | 532 | return res; |
1da177e4 LT |
533 | } |
534 | ||
535 | /* | |
62ab0812 ED |
536 | * This function makes lazy skb cloning in hope that most of packets |
537 | * are discarded by BPF. | |
538 | * | |
539 | * Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
540 | * and skb->cb are mangled. It works because (and until) packets | |
541 | * falling here are owned by current CPU. Output packets are cloned | |
542 | * by dev_queue_xmit_nit(), input packets are processed by net_bh | |
543 | * sequencially, so that if we return skb to original state on exit, | |
544 | * we will not harm anyone. | |
1da177e4 LT |
545 | */ |
546 | ||
40d4e3df ED |
547 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
548 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
549 | { |
550 | struct sock *sk; | |
551 | struct sockaddr_ll *sll; | |
552 | struct packet_sock *po; | |
40d4e3df | 553 | u8 *skb_head = skb->data; |
1da177e4 | 554 | int skb_len = skb->len; |
dbcb5855 | 555 | unsigned int snaplen, res; |
1da177e4 LT |
556 | |
557 | if (skb->pkt_type == PACKET_LOOPBACK) | |
558 | goto drop; | |
559 | ||
560 | sk = pt->af_packet_priv; | |
561 | po = pkt_sk(sk); | |
562 | ||
09ad9bc7 | 563 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
564 | goto drop; |
565 | ||
1da177e4 LT |
566 | skb->dev = dev; |
567 | ||
3b04ddde | 568 | if (dev->header_ops) { |
1da177e4 | 569 | /* The device has an explicit notion of ll header, |
62ab0812 ED |
570 | * exported to higher levels. |
571 | * | |
572 | * Otherwise, the device hides details of its frame | |
573 | * structure, so that corresponding packet head is | |
574 | * never delivered to user. | |
1da177e4 LT |
575 | */ |
576 | if (sk->sk_type != SOCK_DGRAM) | |
98e399f8 | 577 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
578 | else if (skb->pkt_type == PACKET_OUTGOING) { |
579 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 580 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
581 | } |
582 | } | |
583 | ||
584 | snaplen = skb->len; | |
585 | ||
dbcb5855 DM |
586 | res = run_filter(skb, sk, snaplen); |
587 | if (!res) | |
fda9ef5d | 588 | goto drop_n_restore; |
dbcb5855 DM |
589 | if (snaplen > res) |
590 | snaplen = res; | |
1da177e4 LT |
591 | |
592 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
593 | (unsigned)sk->sk_rcvbuf) | |
594 | goto drop_n_acct; | |
595 | ||
596 | if (skb_shared(skb)) { | |
597 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
598 | if (nskb == NULL) | |
599 | goto drop_n_acct; | |
600 | ||
601 | if (skb_head != skb->data) { | |
602 | skb->data = skb_head; | |
603 | skb->len = skb_len; | |
604 | } | |
605 | kfree_skb(skb); | |
606 | skb = nskb; | |
607 | } | |
608 | ||
ffbc6111 HX |
609 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
610 | sizeof(skb->cb)); | |
611 | ||
612 | sll = &PACKET_SKB_CB(skb)->sa.ll; | |
1da177e4 LT |
613 | sll->sll_family = AF_PACKET; |
614 | sll->sll_hatype = dev->type; | |
615 | sll->sll_protocol = skb->protocol; | |
616 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 617 | if (unlikely(po->origdev)) |
80feaacb PWJ |
618 | sll->sll_ifindex = orig_dev->ifindex; |
619 | else | |
620 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 621 | |
b95cce35 | 622 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 | 623 | |
ffbc6111 | 624 | PACKET_SKB_CB(skb)->origlen = skb->len; |
8dc41944 | 625 | |
1da177e4 LT |
626 | if (pskb_trim(skb, snaplen)) |
627 | goto drop_n_acct; | |
628 | ||
629 | skb_set_owner_r(skb, sk); | |
630 | skb->dev = NULL; | |
adf30907 | 631 | skb_dst_drop(skb); |
1da177e4 | 632 | |
84531c24 PO |
633 | /* drop conntrack reference */ |
634 | nf_reset(skb); | |
635 | ||
1da177e4 LT |
636 | spin_lock(&sk->sk_receive_queue.lock); |
637 | po->stats.tp_packets++; | |
3b885787 | 638 | skb->dropcount = atomic_read(&sk->sk_drops); |
1da177e4 LT |
639 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
640 | spin_unlock(&sk->sk_receive_queue.lock); | |
641 | sk->sk_data_ready(sk, skb->len); | |
642 | return 0; | |
643 | ||
644 | drop_n_acct: | |
3b885787 | 645 | po->stats.tp_drops = atomic_inc_return(&sk->sk_drops); |
1da177e4 LT |
646 | |
647 | drop_n_restore: | |
648 | if (skb_head != skb->data && skb_shared(skb)) { | |
649 | skb->data = skb_head; | |
650 | skb->len = skb_len; | |
651 | } | |
652 | drop: | |
ead2ceb0 | 653 | consume_skb(skb); |
1da177e4 LT |
654 | return 0; |
655 | } | |
656 | ||
40d4e3df ED |
657 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
658 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
659 | { |
660 | struct sock *sk; | |
661 | struct packet_sock *po; | |
662 | struct sockaddr_ll *sll; | |
bbd6ef87 PM |
663 | union { |
664 | struct tpacket_hdr *h1; | |
665 | struct tpacket2_hdr *h2; | |
666 | void *raw; | |
667 | } h; | |
40d4e3df | 668 | u8 *skb_head = skb->data; |
1da177e4 | 669 | int skb_len = skb->len; |
dbcb5855 | 670 | unsigned int snaplen, res; |
1da177e4 | 671 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
bbd6ef87 | 672 | unsigned short macoff, netoff, hdrlen; |
1da177e4 | 673 | struct sk_buff *copy_skb = NULL; |
b7aa0bf7 | 674 | struct timeval tv; |
bbd6ef87 | 675 | struct timespec ts; |
614f60fa | 676 | struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb); |
1da177e4 LT |
677 | |
678 | if (skb->pkt_type == PACKET_LOOPBACK) | |
679 | goto drop; | |
680 | ||
681 | sk = pt->af_packet_priv; | |
682 | po = pkt_sk(sk); | |
683 | ||
09ad9bc7 | 684 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
685 | goto drop; |
686 | ||
3b04ddde | 687 | if (dev->header_ops) { |
1da177e4 | 688 | if (sk->sk_type != SOCK_DGRAM) |
98e399f8 | 689 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
690 | else if (skb->pkt_type == PACKET_OUTGOING) { |
691 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 692 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
693 | } |
694 | } | |
695 | ||
8dc41944 HX |
696 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
697 | status |= TP_STATUS_CSUMNOTREADY; | |
698 | ||
1da177e4 LT |
699 | snaplen = skb->len; |
700 | ||
dbcb5855 DM |
701 | res = run_filter(skb, sk, snaplen); |
702 | if (!res) | |
fda9ef5d | 703 | goto drop_n_restore; |
dbcb5855 DM |
704 | if (snaplen > res) |
705 | snaplen = res; | |
1da177e4 LT |
706 | |
707 | if (sk->sk_type == SOCK_DGRAM) { | |
8913336a PM |
708 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
709 | po->tp_reserve; | |
1da177e4 | 710 | } else { |
bbe735e4 | 711 | unsigned maclen = skb_network_offset(skb); |
bbd6ef87 | 712 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
8913336a PM |
713 | (maclen < 16 ? 16 : maclen)) + |
714 | po->tp_reserve; | |
1da177e4 LT |
715 | macoff = netoff - maclen; |
716 | } | |
717 | ||
69e3c75f | 718 | if (macoff + snaplen > po->rx_ring.frame_size) { |
1da177e4 LT |
719 | if (po->copy_thresh && |
720 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < | |
721 | (unsigned)sk->sk_rcvbuf) { | |
722 | if (skb_shared(skb)) { | |
723 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
724 | } else { | |
725 | copy_skb = skb_get(skb); | |
726 | skb_head = skb->data; | |
727 | } | |
728 | if (copy_skb) | |
729 | skb_set_owner_r(copy_skb, sk); | |
730 | } | |
69e3c75f | 731 | snaplen = po->rx_ring.frame_size - macoff; |
1da177e4 LT |
732 | if ((int)snaplen < 0) |
733 | snaplen = 0; | |
734 | } | |
1da177e4 LT |
735 | |
736 | spin_lock(&sk->sk_receive_queue.lock); | |
69e3c75f | 737 | h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL); |
bbd6ef87 | 738 | if (!h.raw) |
1da177e4 | 739 | goto ring_is_full; |
69e3c75f | 740 | packet_increment_head(&po->rx_ring); |
1da177e4 LT |
741 | po->stats.tp_packets++; |
742 | if (copy_skb) { | |
743 | status |= TP_STATUS_COPY; | |
744 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
745 | } | |
746 | if (!po->stats.tp_drops) | |
747 | status &= ~TP_STATUS_LOSING; | |
748 | spin_unlock(&sk->sk_receive_queue.lock); | |
749 | ||
bbd6ef87 | 750 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
1da177e4 | 751 | |
bbd6ef87 PM |
752 | switch (po->tp_version) { |
753 | case TPACKET_V1: | |
754 | h.h1->tp_len = skb->len; | |
755 | h.h1->tp_snaplen = snaplen; | |
756 | h.h1->tp_mac = macoff; | |
757 | h.h1->tp_net = netoff; | |
614f60fa SM |
758 | if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE) |
759 | && shhwtstamps->syststamp.tv64) | |
760 | tv = ktime_to_timeval(shhwtstamps->syststamp); | |
761 | else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE) | |
762 | && shhwtstamps->hwtstamp.tv64) | |
763 | tv = ktime_to_timeval(shhwtstamps->hwtstamp); | |
764 | else if (skb->tstamp.tv64) | |
bbd6ef87 PM |
765 | tv = ktime_to_timeval(skb->tstamp); |
766 | else | |
767 | do_gettimeofday(&tv); | |
768 | h.h1->tp_sec = tv.tv_sec; | |
769 | h.h1->tp_usec = tv.tv_usec; | |
770 | hdrlen = sizeof(*h.h1); | |
771 | break; | |
772 | case TPACKET_V2: | |
773 | h.h2->tp_len = skb->len; | |
774 | h.h2->tp_snaplen = snaplen; | |
775 | h.h2->tp_mac = macoff; | |
776 | h.h2->tp_net = netoff; | |
614f60fa SM |
777 | if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE) |
778 | && shhwtstamps->syststamp.tv64) | |
779 | ts = ktime_to_timespec(shhwtstamps->syststamp); | |
780 | else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE) | |
781 | && shhwtstamps->hwtstamp.tv64) | |
782 | ts = ktime_to_timespec(shhwtstamps->hwtstamp); | |
783 | else if (skb->tstamp.tv64) | |
bbd6ef87 PM |
784 | ts = ktime_to_timespec(skb->tstamp); |
785 | else | |
786 | getnstimeofday(&ts); | |
787 | h.h2->tp_sec = ts.tv_sec; | |
788 | h.h2->tp_nsec = ts.tv_nsec; | |
05423b24 | 789 | h.h2->tp_vlan_tci = vlan_tx_tag_get(skb); |
bbd6ef87 PM |
790 | hdrlen = sizeof(*h.h2); |
791 | break; | |
792 | default: | |
793 | BUG(); | |
794 | } | |
1da177e4 | 795 | |
bbd6ef87 | 796 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
b95cce35 | 797 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 LT |
798 | sll->sll_family = AF_PACKET; |
799 | sll->sll_hatype = dev->type; | |
800 | sll->sll_protocol = skb->protocol; | |
801 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 802 | if (unlikely(po->origdev)) |
80feaacb PWJ |
803 | sll->sll_ifindex = orig_dev->ifindex; |
804 | else | |
805 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 806 | |
bbd6ef87 | 807 | __packet_set_status(po, h.raw, status); |
e16aa207 | 808 | smp_mb(); |
f6dafa95 | 809 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
1da177e4 | 810 | { |
0af55bb5 CG |
811 | u8 *start, *end; |
812 | ||
813 | end = (u8 *)PAGE_ALIGN((unsigned long)h.raw + macoff + snaplen); | |
814 | for (start = h.raw; start < end; start += PAGE_SIZE) | |
815 | flush_dcache_page(pgv_to_page(start)); | |
1da177e4 | 816 | } |
f6dafa95 | 817 | #endif |
1da177e4 LT |
818 | |
819 | sk->sk_data_ready(sk, 0); | |
820 | ||
821 | drop_n_restore: | |
822 | if (skb_head != skb->data && skb_shared(skb)) { | |
823 | skb->data = skb_head; | |
824 | skb->len = skb_len; | |
825 | } | |
826 | drop: | |
1ce4f28b | 827 | kfree_skb(skb); |
1da177e4 LT |
828 | return 0; |
829 | ||
830 | ring_is_full: | |
831 | po->stats.tp_drops++; | |
832 | spin_unlock(&sk->sk_receive_queue.lock); | |
833 | ||
834 | sk->sk_data_ready(sk, 0); | |
acb5d75b | 835 | kfree_skb(copy_skb); |
1da177e4 LT |
836 | goto drop_n_restore; |
837 | } | |
838 | ||
69e3c75f JB |
839 | static void tpacket_destruct_skb(struct sk_buff *skb) |
840 | { | |
841 | struct packet_sock *po = pkt_sk(skb->sk); | |
40d4e3df | 842 | void *ph; |
1da177e4 | 843 | |
69e3c75f | 844 | BUG_ON(skb == NULL); |
1da177e4 | 845 | |
69e3c75f JB |
846 | if (likely(po->tx_ring.pg_vec)) { |
847 | ph = skb_shinfo(skb)->destructor_arg; | |
848 | BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING); | |
849 | BUG_ON(atomic_read(&po->tx_ring.pending) == 0); | |
850 | atomic_dec(&po->tx_ring.pending); | |
851 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE); | |
852 | } | |
853 | ||
854 | sock_wfree(skb); | |
855 | } | |
856 | ||
40d4e3df ED |
857 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
858 | void *frame, struct net_device *dev, int size_max, | |
859 | __be16 proto, unsigned char *addr) | |
69e3c75f JB |
860 | { |
861 | union { | |
862 | struct tpacket_hdr *h1; | |
863 | struct tpacket2_hdr *h2; | |
864 | void *raw; | |
865 | } ph; | |
866 | int to_write, offset, len, tp_len, nr_frags, len_max; | |
867 | struct socket *sock = po->sk.sk_socket; | |
868 | struct page *page; | |
869 | void *data; | |
870 | int err; | |
871 | ||
872 | ph.raw = frame; | |
873 | ||
874 | skb->protocol = proto; | |
875 | skb->dev = dev; | |
876 | skb->priority = po->sk.sk_priority; | |
2d37a186 | 877 | skb->mark = po->sk.sk_mark; |
69e3c75f JB |
878 | skb_shinfo(skb)->destructor_arg = ph.raw; |
879 | ||
880 | switch (po->tp_version) { | |
881 | case TPACKET_V2: | |
882 | tp_len = ph.h2->tp_len; | |
883 | break; | |
884 | default: | |
885 | tp_len = ph.h1->tp_len; | |
886 | break; | |
887 | } | |
888 | if (unlikely(tp_len > size_max)) { | |
40d4e3df | 889 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); |
69e3c75f JB |
890 | return -EMSGSIZE; |
891 | } | |
892 | ||
893 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
894 | skb_reset_network_header(skb); | |
895 | ||
896 | data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll); | |
897 | to_write = tp_len; | |
898 | ||
899 | if (sock->type == SOCK_DGRAM) { | |
900 | err = dev_hard_header(skb, dev, ntohs(proto), addr, | |
901 | NULL, tp_len); | |
902 | if (unlikely(err < 0)) | |
903 | return -EINVAL; | |
40d4e3df | 904 | } else if (dev->hard_header_len) { |
69e3c75f JB |
905 | /* net device doesn't like empty head */ |
906 | if (unlikely(tp_len <= dev->hard_header_len)) { | |
40d4e3df ED |
907 | pr_err("packet size is too short (%d < %d)\n", |
908 | tp_len, dev->hard_header_len); | |
69e3c75f JB |
909 | return -EINVAL; |
910 | } | |
911 | ||
912 | skb_push(skb, dev->hard_header_len); | |
913 | err = skb_store_bits(skb, 0, data, | |
914 | dev->hard_header_len); | |
915 | if (unlikely(err)) | |
916 | return err; | |
917 | ||
918 | data += dev->hard_header_len; | |
919 | to_write -= dev->hard_header_len; | |
920 | } | |
921 | ||
922 | err = -EFAULT; | |
69e3c75f JB |
923 | offset = offset_in_page(data); |
924 | len_max = PAGE_SIZE - offset; | |
925 | len = ((to_write > len_max) ? len_max : to_write); | |
926 | ||
927 | skb->data_len = to_write; | |
928 | skb->len += to_write; | |
929 | skb->truesize += to_write; | |
930 | atomic_add(to_write, &po->sk.sk_wmem_alloc); | |
931 | ||
932 | while (likely(to_write)) { | |
933 | nr_frags = skb_shinfo(skb)->nr_frags; | |
934 | ||
935 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { | |
40d4e3df ED |
936 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
937 | MAX_SKB_FRAGS); | |
69e3c75f JB |
938 | return -EFAULT; |
939 | } | |
940 | ||
0af55bb5 CG |
941 | page = pgv_to_page(data); |
942 | data += len; | |
69e3c75f JB |
943 | flush_dcache_page(page); |
944 | get_page(page); | |
0af55bb5 | 945 | skb_fill_page_desc(skb, nr_frags, page, offset, len); |
69e3c75f JB |
946 | to_write -= len; |
947 | offset = 0; | |
948 | len_max = PAGE_SIZE; | |
949 | len = ((to_write > len_max) ? len_max : to_write); | |
950 | } | |
951 | ||
952 | return tp_len; | |
953 | } | |
954 | ||
955 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) | |
956 | { | |
957 | struct socket *sock; | |
958 | struct sk_buff *skb; | |
959 | struct net_device *dev; | |
960 | __be16 proto; | |
961 | int ifindex, err, reserve = 0; | |
40d4e3df ED |
962 | void *ph; |
963 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; | |
69e3c75f JB |
964 | int tp_len, size_max; |
965 | unsigned char *addr; | |
966 | int len_sum = 0; | |
967 | int status = 0; | |
968 | ||
969 | sock = po->sk.sk_socket; | |
970 | ||
971 | mutex_lock(&po->pg_vec_lock); | |
972 | ||
973 | err = -EBUSY; | |
974 | if (saddr == NULL) { | |
975 | ifindex = po->ifindex; | |
976 | proto = po->num; | |
977 | addr = NULL; | |
978 | } else { | |
979 | err = -EINVAL; | |
980 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
981 | goto out; | |
982 | if (msg->msg_namelen < (saddr->sll_halen | |
983 | + offsetof(struct sockaddr_ll, | |
984 | sll_addr))) | |
985 | goto out; | |
986 | ifindex = saddr->sll_ifindex; | |
987 | proto = saddr->sll_protocol; | |
988 | addr = saddr->sll_addr; | |
989 | } | |
990 | ||
991 | dev = dev_get_by_index(sock_net(&po->sk), ifindex); | |
992 | err = -ENXIO; | |
993 | if (unlikely(dev == NULL)) | |
994 | goto out; | |
995 | ||
996 | reserve = dev->hard_header_len; | |
997 | ||
998 | err = -ENETDOWN; | |
999 | if (unlikely(!(dev->flags & IFF_UP))) | |
1000 | goto out_put; | |
1001 | ||
1002 | size_max = po->tx_ring.frame_size | |
b5dd884e | 1003 | - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
69e3c75f JB |
1004 | |
1005 | if (size_max > dev->mtu + reserve) | |
1006 | size_max = dev->mtu + reserve; | |
1007 | ||
1008 | do { | |
1009 | ph = packet_current_frame(po, &po->tx_ring, | |
1010 | TP_STATUS_SEND_REQUEST); | |
1011 | ||
1012 | if (unlikely(ph == NULL)) { | |
1013 | schedule(); | |
1014 | continue; | |
1015 | } | |
1016 | ||
1017 | status = TP_STATUS_SEND_REQUEST; | |
1018 | skb = sock_alloc_send_skb(&po->sk, | |
1019 | LL_ALLOCATED_SPACE(dev) | |
1020 | + sizeof(struct sockaddr_ll), | |
1021 | 0, &err); | |
1022 | ||
1023 | if (unlikely(skb == NULL)) | |
1024 | goto out_status; | |
1025 | ||
1026 | tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto, | |
1027 | addr); | |
1028 | ||
1029 | if (unlikely(tp_len < 0)) { | |
1030 | if (po->tp_loss) { | |
1031 | __packet_set_status(po, ph, | |
1032 | TP_STATUS_AVAILABLE); | |
1033 | packet_increment_head(&po->tx_ring); | |
1034 | kfree_skb(skb); | |
1035 | continue; | |
1036 | } else { | |
1037 | status = TP_STATUS_WRONG_FORMAT; | |
1038 | err = tp_len; | |
1039 | goto out_status; | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | skb->destructor = tpacket_destruct_skb; | |
1044 | __packet_set_status(po, ph, TP_STATUS_SENDING); | |
1045 | atomic_inc(&po->tx_ring.pending); | |
1046 | ||
1047 | status = TP_STATUS_SEND_REQUEST; | |
1048 | err = dev_queue_xmit(skb); | |
eb70df13 JP |
1049 | if (unlikely(err > 0)) { |
1050 | err = net_xmit_errno(err); | |
1051 | if (err && __packet_get_status(po, ph) == | |
1052 | TP_STATUS_AVAILABLE) { | |
1053 | /* skb was destructed already */ | |
1054 | skb = NULL; | |
1055 | goto out_status; | |
1056 | } | |
1057 | /* | |
1058 | * skb was dropped but not destructed yet; | |
1059 | * let's treat it like congestion or err < 0 | |
1060 | */ | |
1061 | err = 0; | |
1062 | } | |
69e3c75f JB |
1063 | packet_increment_head(&po->tx_ring); |
1064 | len_sum += tp_len; | |
f64f9e71 JP |
1065 | } while (likely((ph != NULL) || |
1066 | ((!(msg->msg_flags & MSG_DONTWAIT)) && | |
1067 | (atomic_read(&po->tx_ring.pending)))) | |
1068 | ); | |
69e3c75f JB |
1069 | |
1070 | err = len_sum; | |
1071 | goto out_put; | |
1072 | ||
69e3c75f JB |
1073 | out_status: |
1074 | __packet_set_status(po, ph, status); | |
1075 | kfree_skb(skb); | |
1076 | out_put: | |
1077 | dev_put(dev); | |
1078 | out: | |
1079 | mutex_unlock(&po->pg_vec_lock); | |
1080 | return err; | |
1081 | } | |
69e3c75f | 1082 | |
bfd5f4a3 SS |
1083 | static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad, |
1084 | size_t reserve, size_t len, | |
1085 | size_t linear, int noblock, | |
1086 | int *err) | |
1087 | { | |
1088 | struct sk_buff *skb; | |
1089 | ||
1090 | /* Under a page? Don't bother with paged skb. */ | |
1091 | if (prepad + len < PAGE_SIZE || !linear) | |
1092 | linear = len; | |
1093 | ||
1094 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, | |
1095 | err); | |
1096 | if (!skb) | |
1097 | return NULL; | |
1098 | ||
1099 | skb_reserve(skb, reserve); | |
1100 | skb_put(skb, linear); | |
1101 | skb->data_len = len - linear; | |
1102 | skb->len += len - linear; | |
1103 | ||
1104 | return skb; | |
1105 | } | |
1106 | ||
69e3c75f | 1107 | static int packet_snd(struct socket *sock, |
1da177e4 LT |
1108 | struct msghdr *msg, size_t len) |
1109 | { | |
1110 | struct sock *sk = sock->sk; | |
40d4e3df | 1111 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
1da177e4 LT |
1112 | struct sk_buff *skb; |
1113 | struct net_device *dev; | |
0e11c91e | 1114 | __be16 proto; |
1da177e4 LT |
1115 | unsigned char *addr; |
1116 | int ifindex, err, reserve = 0; | |
bfd5f4a3 SS |
1117 | struct virtio_net_hdr vnet_hdr = { 0 }; |
1118 | int offset = 0; | |
1119 | int vnet_hdr_len; | |
1120 | struct packet_sock *po = pkt_sk(sk); | |
1121 | unsigned short gso_type = 0; | |
1da177e4 LT |
1122 | |
1123 | /* | |
1ce4f28b | 1124 | * Get and verify the address. |
1da177e4 | 1125 | */ |
1ce4f28b | 1126 | |
1da177e4 | 1127 | if (saddr == NULL) { |
1da177e4 LT |
1128 | ifindex = po->ifindex; |
1129 | proto = po->num; | |
1130 | addr = NULL; | |
1131 | } else { | |
1132 | err = -EINVAL; | |
1133 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
1134 | goto out; | |
0fb375fb EB |
1135 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
1136 | goto out; | |
1da177e4 LT |
1137 | ifindex = saddr->sll_ifindex; |
1138 | proto = saddr->sll_protocol; | |
1139 | addr = saddr->sll_addr; | |
1140 | } | |
1141 | ||
1142 | ||
3b1e0a65 | 1143 | dev = dev_get_by_index(sock_net(sk), ifindex); |
1da177e4 LT |
1144 | err = -ENXIO; |
1145 | if (dev == NULL) | |
1146 | goto out_unlock; | |
1147 | if (sock->type == SOCK_RAW) | |
1148 | reserve = dev->hard_header_len; | |
1149 | ||
d5e76b0a DM |
1150 | err = -ENETDOWN; |
1151 | if (!(dev->flags & IFF_UP)) | |
1152 | goto out_unlock; | |
1153 | ||
bfd5f4a3 SS |
1154 | if (po->has_vnet_hdr) { |
1155 | vnet_hdr_len = sizeof(vnet_hdr); | |
1156 | ||
1157 | err = -EINVAL; | |
1158 | if (len < vnet_hdr_len) | |
1159 | goto out_unlock; | |
1160 | ||
1161 | len -= vnet_hdr_len; | |
1162 | ||
1163 | err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov, | |
1164 | vnet_hdr_len); | |
1165 | if (err < 0) | |
1166 | goto out_unlock; | |
1167 | ||
1168 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && | |
1169 | (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 > | |
1170 | vnet_hdr.hdr_len)) | |
1171 | vnet_hdr.hdr_len = vnet_hdr.csum_start + | |
1172 | vnet_hdr.csum_offset + 2; | |
1173 | ||
1174 | err = -EINVAL; | |
1175 | if (vnet_hdr.hdr_len > len) | |
1176 | goto out_unlock; | |
1177 | ||
1178 | if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
1179 | switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
1180 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
1181 | gso_type = SKB_GSO_TCPV4; | |
1182 | break; | |
1183 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
1184 | gso_type = SKB_GSO_TCPV6; | |
1185 | break; | |
1186 | case VIRTIO_NET_HDR_GSO_UDP: | |
1187 | gso_type = SKB_GSO_UDP; | |
1188 | break; | |
1189 | default: | |
1190 | goto out_unlock; | |
1191 | } | |
1192 | ||
1193 | if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
1194 | gso_type |= SKB_GSO_TCP_ECN; | |
1195 | ||
1196 | if (vnet_hdr.gso_size == 0) | |
1197 | goto out_unlock; | |
1198 | ||
1199 | } | |
1200 | } | |
1201 | ||
1da177e4 | 1202 | err = -EMSGSIZE; |
bfd5f4a3 | 1203 | if (!gso_type && (len > dev->mtu+reserve)) |
1da177e4 LT |
1204 | goto out_unlock; |
1205 | ||
bfd5f4a3 SS |
1206 | err = -ENOBUFS; |
1207 | skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev), | |
1208 | LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len, | |
1209 | msg->msg_flags & MSG_DONTWAIT, &err); | |
40d4e3df | 1210 | if (skb == NULL) |
1da177e4 LT |
1211 | goto out_unlock; |
1212 | ||
bfd5f4a3 | 1213 | skb_set_network_header(skb, reserve); |
1da177e4 | 1214 | |
0c4e8581 SH |
1215 | err = -EINVAL; |
1216 | if (sock->type == SOCK_DGRAM && | |
bfd5f4a3 | 1217 | (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0) |
0c4e8581 | 1218 | goto out_free; |
1da177e4 LT |
1219 | |
1220 | /* Returns -EFAULT on error */ | |
bfd5f4a3 | 1221 | err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len); |
1da177e4 LT |
1222 | if (err) |
1223 | goto out_free; | |
2244d07b | 1224 | err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
ed85b565 RC |
1225 | if (err < 0) |
1226 | goto out_free; | |
1da177e4 LT |
1227 | |
1228 | skb->protocol = proto; | |
1229 | skb->dev = dev; | |
1230 | skb->priority = sk->sk_priority; | |
2d37a186 | 1231 | skb->mark = sk->sk_mark; |
1da177e4 | 1232 | |
bfd5f4a3 SS |
1233 | if (po->has_vnet_hdr) { |
1234 | if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
1235 | if (!skb_partial_csum_set(skb, vnet_hdr.csum_start, | |
1236 | vnet_hdr.csum_offset)) { | |
1237 | err = -EINVAL; | |
1238 | goto out_free; | |
1239 | } | |
1240 | } | |
1241 | ||
1242 | skb_shinfo(skb)->gso_size = vnet_hdr.gso_size; | |
1243 | skb_shinfo(skb)->gso_type = gso_type; | |
1244 | ||
1245 | /* Header must be checked, and gso_segs computed. */ | |
1246 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
1247 | skb_shinfo(skb)->gso_segs = 0; | |
1248 | ||
1249 | len += vnet_hdr_len; | |
1250 | } | |
1251 | ||
1da177e4 LT |
1252 | /* |
1253 | * Now send it | |
1254 | */ | |
1255 | ||
1256 | err = dev_queue_xmit(skb); | |
1257 | if (err > 0 && (err = net_xmit_errno(err)) != 0) | |
1258 | goto out_unlock; | |
1259 | ||
1260 | dev_put(dev); | |
1261 | ||
40d4e3df | 1262 | return len; |
1da177e4 LT |
1263 | |
1264 | out_free: | |
1265 | kfree_skb(skb); | |
1266 | out_unlock: | |
1267 | if (dev) | |
1268 | dev_put(dev); | |
1269 | out: | |
1270 | return err; | |
1271 | } | |
1272 | ||
69e3c75f JB |
1273 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
1274 | struct msghdr *msg, size_t len) | |
1275 | { | |
69e3c75f JB |
1276 | struct sock *sk = sock->sk; |
1277 | struct packet_sock *po = pkt_sk(sk); | |
1278 | if (po->tx_ring.pg_vec) | |
1279 | return tpacket_snd(po, msg); | |
1280 | else | |
69e3c75f JB |
1281 | return packet_snd(sock, msg, len); |
1282 | } | |
1283 | ||
1da177e4 LT |
1284 | /* |
1285 | * Close a PACKET socket. This is fairly simple. We immediately go | |
1286 | * to 'closed' state and remove our protocol entry in the device list. | |
1287 | */ | |
1288 | ||
1289 | static int packet_release(struct socket *sock) | |
1290 | { | |
1291 | struct sock *sk = sock->sk; | |
1292 | struct packet_sock *po; | |
d12d01d6 | 1293 | struct net *net; |
69e3c75f | 1294 | struct tpacket_req req; |
1da177e4 LT |
1295 | |
1296 | if (!sk) | |
1297 | return 0; | |
1298 | ||
3b1e0a65 | 1299 | net = sock_net(sk); |
1da177e4 LT |
1300 | po = pkt_sk(sk); |
1301 | ||
808f5114 | 1302 | spin_lock_bh(&net->packet.sklist_lock); |
1303 | sk_del_node_init_rcu(sk); | |
920de804 | 1304 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
808f5114 | 1305 | spin_unlock_bh(&net->packet.sklist_lock); |
1da177e4 | 1306 | |
808f5114 | 1307 | spin_lock(&po->bind_lock); |
1da177e4 LT |
1308 | if (po->running) { |
1309 | /* | |
808f5114 | 1310 | * Remove from protocol table |
1da177e4 | 1311 | */ |
1da177e4 LT |
1312 | po->running = 0; |
1313 | po->num = 0; | |
808f5114 | 1314 | __dev_remove_pack(&po->prot_hook); |
1da177e4 LT |
1315 | __sock_put(sk); |
1316 | } | |
808f5114 | 1317 | spin_unlock(&po->bind_lock); |
1da177e4 | 1318 | |
1da177e4 | 1319 | packet_flush_mclist(sk); |
1da177e4 | 1320 | |
69e3c75f JB |
1321 | memset(&req, 0, sizeof(req)); |
1322 | ||
1323 | if (po->rx_ring.pg_vec) | |
1324 | packet_set_ring(sk, &req, 1, 0); | |
1325 | ||
1326 | if (po->tx_ring.pg_vec) | |
1327 | packet_set_ring(sk, &req, 1, 1); | |
1da177e4 | 1328 | |
808f5114 | 1329 | synchronize_net(); |
1da177e4 LT |
1330 | /* |
1331 | * Now the socket is dead. No more input will appear. | |
1332 | */ | |
1da177e4 LT |
1333 | sock_orphan(sk); |
1334 | sock->sk = NULL; | |
1335 | ||
1336 | /* Purge queues */ | |
1337 | ||
1338 | skb_queue_purge(&sk->sk_receive_queue); | |
17ab56a2 | 1339 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
1340 | |
1341 | sock_put(sk); | |
1342 | return 0; | |
1343 | } | |
1344 | ||
1345 | /* | |
1346 | * Attach a packet hook. | |
1347 | */ | |
1348 | ||
0e11c91e | 1349 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
1da177e4 LT |
1350 | { |
1351 | struct packet_sock *po = pkt_sk(sk); | |
1352 | /* | |
1353 | * Detach an existing hook if present. | |
1354 | */ | |
1355 | ||
1356 | lock_sock(sk); | |
1357 | ||
1358 | spin_lock(&po->bind_lock); | |
1359 | if (po->running) { | |
1360 | __sock_put(sk); | |
1361 | po->running = 0; | |
1362 | po->num = 0; | |
1363 | spin_unlock(&po->bind_lock); | |
1364 | dev_remove_pack(&po->prot_hook); | |
1365 | spin_lock(&po->bind_lock); | |
1366 | } | |
1367 | ||
1368 | po->num = protocol; | |
1369 | po->prot_hook.type = protocol; | |
1370 | po->prot_hook.dev = dev; | |
1371 | ||
1372 | po->ifindex = dev ? dev->ifindex : 0; | |
1373 | ||
1374 | if (protocol == 0) | |
1375 | goto out_unlock; | |
1376 | ||
be85d4ad | 1377 | if (!dev || (dev->flags & IFF_UP)) { |
1da177e4 LT |
1378 | dev_add_pack(&po->prot_hook); |
1379 | sock_hold(sk); | |
1380 | po->running = 1; | |
be85d4ad UT |
1381 | } else { |
1382 | sk->sk_err = ENETDOWN; | |
1383 | if (!sock_flag(sk, SOCK_DEAD)) | |
1384 | sk->sk_error_report(sk); | |
1da177e4 LT |
1385 | } |
1386 | ||
1387 | out_unlock: | |
1388 | spin_unlock(&po->bind_lock); | |
1389 | release_sock(sk); | |
1390 | return 0; | |
1391 | } | |
1392 | ||
1393 | /* | |
1394 | * Bind a packet socket to a device | |
1395 | */ | |
1396 | ||
40d4e3df ED |
1397 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
1398 | int addr_len) | |
1da177e4 | 1399 | { |
40d4e3df | 1400 | struct sock *sk = sock->sk; |
1da177e4 LT |
1401 | char name[15]; |
1402 | struct net_device *dev; | |
1403 | int err = -ENODEV; | |
1ce4f28b | 1404 | |
1da177e4 LT |
1405 | /* |
1406 | * Check legality | |
1407 | */ | |
1ce4f28b | 1408 | |
8ae55f04 | 1409 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 | 1410 | return -EINVAL; |
40d4e3df | 1411 | strlcpy(name, uaddr->sa_data, sizeof(name)); |
1da177e4 | 1412 | |
3b1e0a65 | 1413 | dev = dev_get_by_name(sock_net(sk), name); |
1da177e4 LT |
1414 | if (dev) { |
1415 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); | |
1416 | dev_put(dev); | |
1417 | } | |
1418 | return err; | |
1419 | } | |
1da177e4 LT |
1420 | |
1421 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
1422 | { | |
40d4e3df ED |
1423 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
1424 | struct sock *sk = sock->sk; | |
1da177e4 LT |
1425 | struct net_device *dev = NULL; |
1426 | int err; | |
1427 | ||
1428 | ||
1429 | /* | |
1430 | * Check legality | |
1431 | */ | |
1ce4f28b | 1432 | |
1da177e4 LT |
1433 | if (addr_len < sizeof(struct sockaddr_ll)) |
1434 | return -EINVAL; | |
1435 | if (sll->sll_family != AF_PACKET) | |
1436 | return -EINVAL; | |
1437 | ||
1438 | if (sll->sll_ifindex) { | |
1439 | err = -ENODEV; | |
3b1e0a65 | 1440 | dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex); |
1da177e4 LT |
1441 | if (dev == NULL) |
1442 | goto out; | |
1443 | } | |
1444 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
1445 | if (dev) | |
1446 | dev_put(dev); | |
1447 | ||
1448 | out: | |
1449 | return err; | |
1450 | } | |
1451 | ||
1452 | static struct proto packet_proto = { | |
1453 | .name = "PACKET", | |
1454 | .owner = THIS_MODULE, | |
1455 | .obj_size = sizeof(struct packet_sock), | |
1456 | }; | |
1457 | ||
1458 | /* | |
1ce4f28b | 1459 | * Create a packet of type SOCK_PACKET. |
1da177e4 LT |
1460 | */ |
1461 | ||
3f378b68 EP |
1462 | static int packet_create(struct net *net, struct socket *sock, int protocol, |
1463 | int kern) | |
1da177e4 LT |
1464 | { |
1465 | struct sock *sk; | |
1466 | struct packet_sock *po; | |
0e11c91e | 1467 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1da177e4 LT |
1468 | int err; |
1469 | ||
1470 | if (!capable(CAP_NET_RAW)) | |
1471 | return -EPERM; | |
be02097c DM |
1472 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
1473 | sock->type != SOCK_PACKET) | |
1da177e4 LT |
1474 | return -ESOCKTNOSUPPORT; |
1475 | ||
1476 | sock->state = SS_UNCONNECTED; | |
1477 | ||
1478 | err = -ENOBUFS; | |
6257ff21 | 1479 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto); |
1da177e4 LT |
1480 | if (sk == NULL) |
1481 | goto out; | |
1482 | ||
1483 | sock->ops = &packet_ops; | |
1da177e4 LT |
1484 | if (sock->type == SOCK_PACKET) |
1485 | sock->ops = &packet_ops_spkt; | |
be02097c | 1486 | |
1da177e4 LT |
1487 | sock_init_data(sock, sk); |
1488 | ||
1489 | po = pkt_sk(sk); | |
1490 | sk->sk_family = PF_PACKET; | |
0e11c91e | 1491 | po->num = proto; |
1da177e4 LT |
1492 | |
1493 | sk->sk_destruct = packet_sock_destruct; | |
17ab56a2 | 1494 | sk_refcnt_debug_inc(sk); |
1da177e4 LT |
1495 | |
1496 | /* | |
1497 | * Attach a protocol block | |
1498 | */ | |
1499 | ||
1500 | spin_lock_init(&po->bind_lock); | |
905db440 | 1501 | mutex_init(&po->pg_vec_lock); |
1da177e4 | 1502 | po->prot_hook.func = packet_rcv; |
be02097c | 1503 | |
1da177e4 LT |
1504 | if (sock->type == SOCK_PACKET) |
1505 | po->prot_hook.func = packet_rcv_spkt; | |
be02097c | 1506 | |
1da177e4 LT |
1507 | po->prot_hook.af_packet_priv = sk; |
1508 | ||
0e11c91e AV |
1509 | if (proto) { |
1510 | po->prot_hook.type = proto; | |
1da177e4 LT |
1511 | dev_add_pack(&po->prot_hook); |
1512 | sock_hold(sk); | |
1513 | po->running = 1; | |
1514 | } | |
1515 | ||
808f5114 | 1516 | spin_lock_bh(&net->packet.sklist_lock); |
1517 | sk_add_node_rcu(sk, &net->packet.sklist); | |
3680453c | 1518 | sock_prot_inuse_add(net, &packet_proto, 1); |
808f5114 | 1519 | spin_unlock_bh(&net->packet.sklist_lock); |
1520 | ||
40d4e3df | 1521 | return 0; |
1da177e4 LT |
1522 | out: |
1523 | return err; | |
1524 | } | |
1525 | ||
ed85b565 RC |
1526 | static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len) |
1527 | { | |
1528 | struct sock_exterr_skb *serr; | |
1529 | struct sk_buff *skb, *skb2; | |
1530 | int copied, err; | |
1531 | ||
1532 | err = -EAGAIN; | |
1533 | skb = skb_dequeue(&sk->sk_error_queue); | |
1534 | if (skb == NULL) | |
1535 | goto out; | |
1536 | ||
1537 | copied = skb->len; | |
1538 | if (copied > len) { | |
1539 | msg->msg_flags |= MSG_TRUNC; | |
1540 | copied = len; | |
1541 | } | |
1542 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1543 | if (err) | |
1544 | goto out_free_skb; | |
1545 | ||
1546 | sock_recv_timestamp(msg, sk, skb); | |
1547 | ||
1548 | serr = SKB_EXT_ERR(skb); | |
1549 | put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP, | |
1550 | sizeof(serr->ee), &serr->ee); | |
1551 | ||
1552 | msg->msg_flags |= MSG_ERRQUEUE; | |
1553 | err = copied; | |
1554 | ||
1555 | /* Reset and regenerate socket error */ | |
1556 | spin_lock_bh(&sk->sk_error_queue.lock); | |
1557 | sk->sk_err = 0; | |
1558 | if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { | |
1559 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; | |
1560 | spin_unlock_bh(&sk->sk_error_queue.lock); | |
1561 | sk->sk_error_report(sk); | |
1562 | } else | |
1563 | spin_unlock_bh(&sk->sk_error_queue.lock); | |
1564 | ||
1565 | out_free_skb: | |
1566 | kfree_skb(skb); | |
1567 | out: | |
1568 | return err; | |
1569 | } | |
1570 | ||
1da177e4 LT |
1571 | /* |
1572 | * Pull a packet from our receive queue and hand it to the user. | |
1573 | * If necessary we block. | |
1574 | */ | |
1575 | ||
1576 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1577 | struct msghdr *msg, size_t len, int flags) | |
1578 | { | |
1579 | struct sock *sk = sock->sk; | |
1580 | struct sk_buff *skb; | |
1581 | int copied, err; | |
0fb375fb | 1582 | struct sockaddr_ll *sll; |
bfd5f4a3 | 1583 | int vnet_hdr_len = 0; |
1da177e4 LT |
1584 | |
1585 | err = -EINVAL; | |
ed85b565 | 1586 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE)) |
1da177e4 LT |
1587 | goto out; |
1588 | ||
1589 | #if 0 | |
1590 | /* What error should we return now? EUNATTACH? */ | |
1591 | if (pkt_sk(sk)->ifindex < 0) | |
1592 | return -ENODEV; | |
1593 | #endif | |
1594 | ||
ed85b565 RC |
1595 | if (flags & MSG_ERRQUEUE) { |
1596 | err = packet_recv_error(sk, msg, len); | |
1597 | goto out; | |
1598 | } | |
1599 | ||
1da177e4 LT |
1600 | /* |
1601 | * Call the generic datagram receiver. This handles all sorts | |
1602 | * of horrible races and re-entrancy so we can forget about it | |
1603 | * in the protocol layers. | |
1604 | * | |
1605 | * Now it will return ENETDOWN, if device have just gone down, | |
1606 | * but then it will block. | |
1607 | */ | |
1608 | ||
40d4e3df | 1609 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
1da177e4 LT |
1610 | |
1611 | /* | |
1ce4f28b | 1612 | * An error occurred so return it. Because skb_recv_datagram() |
1da177e4 LT |
1613 | * handles the blocking we don't see and worry about blocking |
1614 | * retries. | |
1615 | */ | |
1616 | ||
8ae55f04 | 1617 | if (skb == NULL) |
1da177e4 LT |
1618 | goto out; |
1619 | ||
bfd5f4a3 SS |
1620 | if (pkt_sk(sk)->has_vnet_hdr) { |
1621 | struct virtio_net_hdr vnet_hdr = { 0 }; | |
1622 | ||
1623 | err = -EINVAL; | |
1624 | vnet_hdr_len = sizeof(vnet_hdr); | |
1f18b717 | 1625 | if (len < vnet_hdr_len) |
bfd5f4a3 SS |
1626 | goto out_free; |
1627 | ||
1f18b717 MK |
1628 | len -= vnet_hdr_len; |
1629 | ||
bfd5f4a3 SS |
1630 | if (skb_is_gso(skb)) { |
1631 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
1632 | ||
1633 | /* This is a hint as to how much should be linear. */ | |
1634 | vnet_hdr.hdr_len = skb_headlen(skb); | |
1635 | vnet_hdr.gso_size = sinfo->gso_size; | |
1636 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
1637 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
1638 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
1639 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
1640 | else if (sinfo->gso_type & SKB_GSO_UDP) | |
1641 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
1642 | else if (sinfo->gso_type & SKB_GSO_FCOE) | |
1643 | goto out_free; | |
1644 | else | |
1645 | BUG(); | |
1646 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
1647 | vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
1648 | } else | |
1649 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
1650 | ||
1651 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
1652 | vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
1653 | vnet_hdr.csum_start = skb->csum_start - | |
1654 | skb_headroom(skb); | |
1655 | vnet_hdr.csum_offset = skb->csum_offset; | |
1656 | } /* else everything is zero */ | |
1657 | ||
1658 | err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr, | |
1659 | vnet_hdr_len); | |
1660 | if (err < 0) | |
1661 | goto out_free; | |
1662 | } | |
1663 | ||
0fb375fb EB |
1664 | /* |
1665 | * If the address length field is there to be filled in, we fill | |
1666 | * it in now. | |
1667 | */ | |
1668 | ||
ffbc6111 | 1669 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
0fb375fb EB |
1670 | if (sock->type == SOCK_PACKET) |
1671 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
1672 | else | |
1673 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); | |
1674 | ||
1da177e4 LT |
1675 | /* |
1676 | * You lose any data beyond the buffer you gave. If it worries a | |
1677 | * user program they can ask the device for its MTU anyway. | |
1678 | */ | |
1679 | ||
1680 | copied = skb->len; | |
40d4e3df ED |
1681 | if (copied > len) { |
1682 | copied = len; | |
1683 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 LT |
1684 | } |
1685 | ||
1686 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1687 | if (err) | |
1688 | goto out_free; | |
1689 | ||
3b885787 | 1690 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
1691 | |
1692 | if (msg->msg_name) | |
ffbc6111 HX |
1693 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
1694 | msg->msg_namelen); | |
1da177e4 | 1695 | |
8dc41944 | 1696 | if (pkt_sk(sk)->auxdata) { |
ffbc6111 HX |
1697 | struct tpacket_auxdata aux; |
1698 | ||
1699 | aux.tp_status = TP_STATUS_USER; | |
1700 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
1701 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; | |
1702 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; | |
1703 | aux.tp_snaplen = skb->len; | |
1704 | aux.tp_mac = 0; | |
bbe735e4 | 1705 | aux.tp_net = skb_network_offset(skb); |
05423b24 | 1706 | aux.tp_vlan_tci = vlan_tx_tag_get(skb); |
ffbc6111 HX |
1707 | |
1708 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); | |
8dc41944 HX |
1709 | } |
1710 | ||
1da177e4 LT |
1711 | /* |
1712 | * Free or return the buffer as appropriate. Again this | |
1713 | * hides all the races and re-entrancy issues from us. | |
1714 | */ | |
bfd5f4a3 | 1715 | err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied); |
1da177e4 LT |
1716 | |
1717 | out_free: | |
1718 | skb_free_datagram(sk, skb); | |
1719 | out: | |
1720 | return err; | |
1721 | } | |
1722 | ||
1da177e4 LT |
1723 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
1724 | int *uaddr_len, int peer) | |
1725 | { | |
1726 | struct net_device *dev; | |
1727 | struct sock *sk = sock->sk; | |
1728 | ||
1729 | if (peer) | |
1730 | return -EOPNOTSUPP; | |
1731 | ||
1732 | uaddr->sa_family = AF_PACKET; | |
654d1f8a ED |
1733 | rcu_read_lock(); |
1734 | dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); | |
1735 | if (dev) | |
67286640 | 1736 | strncpy(uaddr->sa_data, dev->name, 14); |
654d1f8a | 1737 | else |
1da177e4 | 1738 | memset(uaddr->sa_data, 0, 14); |
654d1f8a | 1739 | rcu_read_unlock(); |
1da177e4 LT |
1740 | *uaddr_len = sizeof(*uaddr); |
1741 | ||
1742 | return 0; | |
1743 | } | |
1da177e4 LT |
1744 | |
1745 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
1746 | int *uaddr_len, int peer) | |
1747 | { | |
1748 | struct net_device *dev; | |
1749 | struct sock *sk = sock->sk; | |
1750 | struct packet_sock *po = pkt_sk(sk); | |
13cfa97b | 1751 | DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr); |
1da177e4 LT |
1752 | |
1753 | if (peer) | |
1754 | return -EOPNOTSUPP; | |
1755 | ||
1756 | sll->sll_family = AF_PACKET; | |
1757 | sll->sll_ifindex = po->ifindex; | |
1758 | sll->sll_protocol = po->num; | |
67286640 | 1759 | sll->sll_pkttype = 0; |
654d1f8a ED |
1760 | rcu_read_lock(); |
1761 | dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex); | |
1da177e4 LT |
1762 | if (dev) { |
1763 | sll->sll_hatype = dev->type; | |
1764 | sll->sll_halen = dev->addr_len; | |
1765 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1da177e4 LT |
1766 | } else { |
1767 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
1768 | sll->sll_halen = 0; | |
1769 | } | |
654d1f8a | 1770 | rcu_read_unlock(); |
0fb375fb | 1771 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
1772 | |
1773 | return 0; | |
1774 | } | |
1775 | ||
2aeb0b88 WC |
1776 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
1777 | int what) | |
1da177e4 LT |
1778 | { |
1779 | switch (i->type) { | |
1780 | case PACKET_MR_MULTICAST: | |
1162563f JP |
1781 | if (i->alen != dev->addr_len) |
1782 | return -EINVAL; | |
1da177e4 | 1783 | if (what > 0) |
22bedad3 | 1784 | return dev_mc_add(dev, i->addr); |
1da177e4 | 1785 | else |
22bedad3 | 1786 | return dev_mc_del(dev, i->addr); |
1da177e4 LT |
1787 | break; |
1788 | case PACKET_MR_PROMISC: | |
2aeb0b88 | 1789 | return dev_set_promiscuity(dev, what); |
1da177e4 LT |
1790 | break; |
1791 | case PACKET_MR_ALLMULTI: | |
2aeb0b88 | 1792 | return dev_set_allmulti(dev, what); |
1da177e4 | 1793 | break; |
d95ed927 | 1794 | case PACKET_MR_UNICAST: |
1162563f JP |
1795 | if (i->alen != dev->addr_len) |
1796 | return -EINVAL; | |
d95ed927 | 1797 | if (what > 0) |
a748ee24 | 1798 | return dev_uc_add(dev, i->addr); |
d95ed927 | 1799 | else |
a748ee24 | 1800 | return dev_uc_del(dev, i->addr); |
d95ed927 | 1801 | break; |
40d4e3df ED |
1802 | default: |
1803 | break; | |
1da177e4 | 1804 | } |
2aeb0b88 | 1805 | return 0; |
1da177e4 LT |
1806 | } |
1807 | ||
1808 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
1809 | { | |
40d4e3df | 1810 | for ( ; i; i = i->next) { |
1da177e4 LT |
1811 | if (i->ifindex == dev->ifindex) |
1812 | packet_dev_mc(dev, i, what); | |
1813 | } | |
1814 | } | |
1815 | ||
0fb375fb | 1816 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1817 | { |
1818 | struct packet_sock *po = pkt_sk(sk); | |
1819 | struct packet_mclist *ml, *i; | |
1820 | struct net_device *dev; | |
1821 | int err; | |
1822 | ||
1823 | rtnl_lock(); | |
1824 | ||
1825 | err = -ENODEV; | |
3b1e0a65 | 1826 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
1da177e4 LT |
1827 | if (!dev) |
1828 | goto done; | |
1829 | ||
1830 | err = -EINVAL; | |
1162563f | 1831 | if (mreq->mr_alen > dev->addr_len) |
1da177e4 LT |
1832 | goto done; |
1833 | ||
1834 | err = -ENOBUFS; | |
8b3a7005 | 1835 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
1836 | if (i == NULL) |
1837 | goto done; | |
1838 | ||
1839 | err = 0; | |
1840 | for (ml = po->mclist; ml; ml = ml->next) { | |
1841 | if (ml->ifindex == mreq->mr_ifindex && | |
1842 | ml->type == mreq->mr_type && | |
1843 | ml->alen == mreq->mr_alen && | |
1844 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1845 | ml->count++; | |
1846 | /* Free the new element ... */ | |
1847 | kfree(i); | |
1848 | goto done; | |
1849 | } | |
1850 | } | |
1851 | ||
1852 | i->type = mreq->mr_type; | |
1853 | i->ifindex = mreq->mr_ifindex; | |
1854 | i->alen = mreq->mr_alen; | |
1855 | memcpy(i->addr, mreq->mr_address, i->alen); | |
1856 | i->count = 1; | |
1857 | i->next = po->mclist; | |
1858 | po->mclist = i; | |
2aeb0b88 WC |
1859 | err = packet_dev_mc(dev, i, 1); |
1860 | if (err) { | |
1861 | po->mclist = i->next; | |
1862 | kfree(i); | |
1863 | } | |
1da177e4 LT |
1864 | |
1865 | done: | |
1866 | rtnl_unlock(); | |
1867 | return err; | |
1868 | } | |
1869 | ||
0fb375fb | 1870 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1871 | { |
1872 | struct packet_mclist *ml, **mlp; | |
1873 | ||
1874 | rtnl_lock(); | |
1875 | ||
1876 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
1877 | if (ml->ifindex == mreq->mr_ifindex && | |
1878 | ml->type == mreq->mr_type && | |
1879 | ml->alen == mreq->mr_alen && | |
1880 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1881 | if (--ml->count == 0) { | |
1882 | struct net_device *dev; | |
1883 | *mlp = ml->next; | |
ad959e76 ED |
1884 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1885 | if (dev) | |
1da177e4 | 1886 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
1887 | kfree(ml); |
1888 | } | |
1889 | rtnl_unlock(); | |
1890 | return 0; | |
1891 | } | |
1892 | } | |
1893 | rtnl_unlock(); | |
1894 | return -EADDRNOTAVAIL; | |
1895 | } | |
1896 | ||
1897 | static void packet_flush_mclist(struct sock *sk) | |
1898 | { | |
1899 | struct packet_sock *po = pkt_sk(sk); | |
1900 | struct packet_mclist *ml; | |
1901 | ||
1902 | if (!po->mclist) | |
1903 | return; | |
1904 | ||
1905 | rtnl_lock(); | |
1906 | while ((ml = po->mclist) != NULL) { | |
1907 | struct net_device *dev; | |
1908 | ||
1909 | po->mclist = ml->next; | |
ad959e76 ED |
1910 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1911 | if (dev != NULL) | |
1da177e4 | 1912 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
1913 | kfree(ml); |
1914 | } | |
1915 | rtnl_unlock(); | |
1916 | } | |
1da177e4 LT |
1917 | |
1918 | static int | |
b7058842 | 1919 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1920 | { |
1921 | struct sock *sk = sock->sk; | |
8dc41944 | 1922 | struct packet_sock *po = pkt_sk(sk); |
1da177e4 LT |
1923 | int ret; |
1924 | ||
1925 | if (level != SOL_PACKET) | |
1926 | return -ENOPROTOOPT; | |
1927 | ||
69e3c75f | 1928 | switch (optname) { |
1ce4f28b | 1929 | case PACKET_ADD_MEMBERSHIP: |
1da177e4 LT |
1930 | case PACKET_DROP_MEMBERSHIP: |
1931 | { | |
0fb375fb EB |
1932 | struct packet_mreq_max mreq; |
1933 | int len = optlen; | |
1934 | memset(&mreq, 0, sizeof(mreq)); | |
1935 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 1936 | return -EINVAL; |
0fb375fb EB |
1937 | if (len > sizeof(mreq)) |
1938 | len = sizeof(mreq); | |
40d4e3df | 1939 | if (copy_from_user(&mreq, optval, len)) |
1da177e4 | 1940 | return -EFAULT; |
0fb375fb EB |
1941 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
1942 | return -EINVAL; | |
1da177e4 LT |
1943 | if (optname == PACKET_ADD_MEMBERSHIP) |
1944 | ret = packet_mc_add(sk, &mreq); | |
1945 | else | |
1946 | ret = packet_mc_drop(sk, &mreq); | |
1947 | return ret; | |
1948 | } | |
a2efcfa0 | 1949 | |
1da177e4 | 1950 | case PACKET_RX_RING: |
69e3c75f | 1951 | case PACKET_TX_RING: |
1da177e4 LT |
1952 | { |
1953 | struct tpacket_req req; | |
1954 | ||
40d4e3df | 1955 | if (optlen < sizeof(req)) |
1da177e4 | 1956 | return -EINVAL; |
bfd5f4a3 SS |
1957 | if (pkt_sk(sk)->has_vnet_hdr) |
1958 | return -EINVAL; | |
40d4e3df | 1959 | if (copy_from_user(&req, optval, sizeof(req))) |
1da177e4 | 1960 | return -EFAULT; |
69e3c75f | 1961 | return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING); |
1da177e4 LT |
1962 | } |
1963 | case PACKET_COPY_THRESH: | |
1964 | { | |
1965 | int val; | |
1966 | ||
40d4e3df | 1967 | if (optlen != sizeof(val)) |
1da177e4 | 1968 | return -EINVAL; |
40d4e3df | 1969 | if (copy_from_user(&val, optval, sizeof(val))) |
1da177e4 LT |
1970 | return -EFAULT; |
1971 | ||
1972 | pkt_sk(sk)->copy_thresh = val; | |
1973 | return 0; | |
1974 | } | |
bbd6ef87 PM |
1975 | case PACKET_VERSION: |
1976 | { | |
1977 | int val; | |
1978 | ||
1979 | if (optlen != sizeof(val)) | |
1980 | return -EINVAL; | |
69e3c75f | 1981 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
bbd6ef87 PM |
1982 | return -EBUSY; |
1983 | if (copy_from_user(&val, optval, sizeof(val))) | |
1984 | return -EFAULT; | |
1985 | switch (val) { | |
1986 | case TPACKET_V1: | |
1987 | case TPACKET_V2: | |
1988 | po->tp_version = val; | |
1989 | return 0; | |
1990 | default: | |
1991 | return -EINVAL; | |
1992 | } | |
1993 | } | |
8913336a PM |
1994 | case PACKET_RESERVE: |
1995 | { | |
1996 | unsigned int val; | |
1997 | ||
1998 | if (optlen != sizeof(val)) | |
1999 | return -EINVAL; | |
69e3c75f | 2000 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
8913336a PM |
2001 | return -EBUSY; |
2002 | if (copy_from_user(&val, optval, sizeof(val))) | |
2003 | return -EFAULT; | |
2004 | po->tp_reserve = val; | |
2005 | return 0; | |
2006 | } | |
69e3c75f JB |
2007 | case PACKET_LOSS: |
2008 | { | |
2009 | unsigned int val; | |
2010 | ||
2011 | if (optlen != sizeof(val)) | |
2012 | return -EINVAL; | |
2013 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
2014 | return -EBUSY; | |
2015 | if (copy_from_user(&val, optval, sizeof(val))) | |
2016 | return -EFAULT; | |
2017 | po->tp_loss = !!val; | |
2018 | return 0; | |
2019 | } | |
8dc41944 HX |
2020 | case PACKET_AUXDATA: |
2021 | { | |
2022 | int val; | |
2023 | ||
2024 | if (optlen < sizeof(val)) | |
2025 | return -EINVAL; | |
2026 | if (copy_from_user(&val, optval, sizeof(val))) | |
2027 | return -EFAULT; | |
2028 | ||
2029 | po->auxdata = !!val; | |
2030 | return 0; | |
2031 | } | |
80feaacb PWJ |
2032 | case PACKET_ORIGDEV: |
2033 | { | |
2034 | int val; | |
2035 | ||
2036 | if (optlen < sizeof(val)) | |
2037 | return -EINVAL; | |
2038 | if (copy_from_user(&val, optval, sizeof(val))) | |
2039 | return -EFAULT; | |
2040 | ||
2041 | po->origdev = !!val; | |
2042 | return 0; | |
2043 | } | |
bfd5f4a3 SS |
2044 | case PACKET_VNET_HDR: |
2045 | { | |
2046 | int val; | |
2047 | ||
2048 | if (sock->type != SOCK_RAW) | |
2049 | return -EINVAL; | |
2050 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
2051 | return -EBUSY; | |
2052 | if (optlen < sizeof(val)) | |
2053 | return -EINVAL; | |
2054 | if (copy_from_user(&val, optval, sizeof(val))) | |
2055 | return -EFAULT; | |
2056 | ||
2057 | po->has_vnet_hdr = !!val; | |
2058 | return 0; | |
2059 | } | |
614f60fa SM |
2060 | case PACKET_TIMESTAMP: |
2061 | { | |
2062 | int val; | |
2063 | ||
2064 | if (optlen != sizeof(val)) | |
2065 | return -EINVAL; | |
2066 | if (copy_from_user(&val, optval, sizeof(val))) | |
2067 | return -EFAULT; | |
2068 | ||
2069 | po->tp_tstamp = val; | |
2070 | return 0; | |
2071 | } | |
1da177e4 LT |
2072 | default: |
2073 | return -ENOPROTOOPT; | |
2074 | } | |
2075 | } | |
2076 | ||
2077 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
2078 | char __user *optval, int __user *optlen) | |
2079 | { | |
2080 | int len; | |
8dc41944 | 2081 | int val; |
1da177e4 LT |
2082 | struct sock *sk = sock->sk; |
2083 | struct packet_sock *po = pkt_sk(sk); | |
8dc41944 HX |
2084 | void *data; |
2085 | struct tpacket_stats st; | |
1da177e4 LT |
2086 | |
2087 | if (level != SOL_PACKET) | |
2088 | return -ENOPROTOOPT; | |
2089 | ||
8ae55f04 KK |
2090 | if (get_user(len, optlen)) |
2091 | return -EFAULT; | |
1da177e4 LT |
2092 | |
2093 | if (len < 0) | |
2094 | return -EINVAL; | |
1ce4f28b | 2095 | |
69e3c75f | 2096 | switch (optname) { |
1da177e4 | 2097 | case PACKET_STATISTICS: |
1da177e4 LT |
2098 | if (len > sizeof(struct tpacket_stats)) |
2099 | len = sizeof(struct tpacket_stats); | |
2100 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
2101 | st = po->stats; | |
2102 | memset(&po->stats, 0, sizeof(st)); | |
2103 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
2104 | st.tp_packets += st.tp_drops; | |
2105 | ||
8dc41944 HX |
2106 | data = &st; |
2107 | break; | |
2108 | case PACKET_AUXDATA: | |
2109 | if (len > sizeof(int)) | |
2110 | len = sizeof(int); | |
2111 | val = po->auxdata; | |
2112 | ||
80feaacb PWJ |
2113 | data = &val; |
2114 | break; | |
2115 | case PACKET_ORIGDEV: | |
2116 | if (len > sizeof(int)) | |
2117 | len = sizeof(int); | |
2118 | val = po->origdev; | |
2119 | ||
bfd5f4a3 SS |
2120 | data = &val; |
2121 | break; | |
2122 | case PACKET_VNET_HDR: | |
2123 | if (len > sizeof(int)) | |
2124 | len = sizeof(int); | |
2125 | val = po->has_vnet_hdr; | |
2126 | ||
8dc41944 | 2127 | data = &val; |
1da177e4 | 2128 | break; |
bbd6ef87 PM |
2129 | case PACKET_VERSION: |
2130 | if (len > sizeof(int)) | |
2131 | len = sizeof(int); | |
2132 | val = po->tp_version; | |
2133 | data = &val; | |
2134 | break; | |
2135 | case PACKET_HDRLEN: | |
2136 | if (len > sizeof(int)) | |
2137 | len = sizeof(int); | |
2138 | if (copy_from_user(&val, optval, len)) | |
2139 | return -EFAULT; | |
2140 | switch (val) { | |
2141 | case TPACKET_V1: | |
2142 | val = sizeof(struct tpacket_hdr); | |
2143 | break; | |
2144 | case TPACKET_V2: | |
2145 | val = sizeof(struct tpacket2_hdr); | |
2146 | break; | |
2147 | default: | |
2148 | return -EINVAL; | |
2149 | } | |
2150 | data = &val; | |
2151 | break; | |
8913336a PM |
2152 | case PACKET_RESERVE: |
2153 | if (len > sizeof(unsigned int)) | |
2154 | len = sizeof(unsigned int); | |
2155 | val = po->tp_reserve; | |
2156 | data = &val; | |
2157 | break; | |
69e3c75f JB |
2158 | case PACKET_LOSS: |
2159 | if (len > sizeof(unsigned int)) | |
2160 | len = sizeof(unsigned int); | |
2161 | val = po->tp_loss; | |
2162 | data = &val; | |
2163 | break; | |
614f60fa SM |
2164 | case PACKET_TIMESTAMP: |
2165 | if (len > sizeof(int)) | |
2166 | len = sizeof(int); | |
2167 | val = po->tp_tstamp; | |
2168 | data = &val; | |
2169 | break; | |
1da177e4 LT |
2170 | default: |
2171 | return -ENOPROTOOPT; | |
2172 | } | |
2173 | ||
8ae55f04 KK |
2174 | if (put_user(len, optlen)) |
2175 | return -EFAULT; | |
8dc41944 HX |
2176 | if (copy_to_user(optval, data, len)) |
2177 | return -EFAULT; | |
8ae55f04 | 2178 | return 0; |
1da177e4 LT |
2179 | } |
2180 | ||
2181 | ||
2182 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) | |
2183 | { | |
2184 | struct sock *sk; | |
2185 | struct hlist_node *node; | |
ad930650 | 2186 | struct net_device *dev = data; |
c346dca1 | 2187 | struct net *net = dev_net(dev); |
1da177e4 | 2188 | |
808f5114 | 2189 | rcu_read_lock(); |
2190 | sk_for_each_rcu(sk, node, &net->packet.sklist) { | |
1da177e4 LT |
2191 | struct packet_sock *po = pkt_sk(sk); |
2192 | ||
2193 | switch (msg) { | |
2194 | case NETDEV_UNREGISTER: | |
1da177e4 LT |
2195 | if (po->mclist) |
2196 | packet_dev_mclist(dev, po->mclist, -1); | |
a2efcfa0 DM |
2197 | /* fallthrough */ |
2198 | ||
1da177e4 LT |
2199 | case NETDEV_DOWN: |
2200 | if (dev->ifindex == po->ifindex) { | |
2201 | spin_lock(&po->bind_lock); | |
2202 | if (po->running) { | |
2203 | __dev_remove_pack(&po->prot_hook); | |
2204 | __sock_put(sk); | |
2205 | po->running = 0; | |
2206 | sk->sk_err = ENETDOWN; | |
2207 | if (!sock_flag(sk, SOCK_DEAD)) | |
2208 | sk->sk_error_report(sk); | |
2209 | } | |
2210 | if (msg == NETDEV_UNREGISTER) { | |
2211 | po->ifindex = -1; | |
2212 | po->prot_hook.dev = NULL; | |
2213 | } | |
2214 | spin_unlock(&po->bind_lock); | |
2215 | } | |
2216 | break; | |
2217 | case NETDEV_UP: | |
808f5114 | 2218 | if (dev->ifindex == po->ifindex) { |
2219 | spin_lock(&po->bind_lock); | |
2220 | if (po->num && !po->running) { | |
2221 | dev_add_pack(&po->prot_hook); | |
2222 | sock_hold(sk); | |
2223 | po->running = 1; | |
2224 | } | |
2225 | spin_unlock(&po->bind_lock); | |
1da177e4 | 2226 | } |
1da177e4 LT |
2227 | break; |
2228 | } | |
2229 | } | |
808f5114 | 2230 | rcu_read_unlock(); |
1da177e4 LT |
2231 | return NOTIFY_DONE; |
2232 | } | |
2233 | ||
2234 | ||
2235 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
2236 | unsigned long arg) | |
2237 | { | |
2238 | struct sock *sk = sock->sk; | |
2239 | ||
69e3c75f | 2240 | switch (cmd) { |
40d4e3df ED |
2241 | case SIOCOUTQ: |
2242 | { | |
2243 | int amount = sk_wmem_alloc_get(sk); | |
31e6d363 | 2244 | |
40d4e3df ED |
2245 | return put_user(amount, (int __user *)arg); |
2246 | } | |
2247 | case SIOCINQ: | |
2248 | { | |
2249 | struct sk_buff *skb; | |
2250 | int amount = 0; | |
2251 | ||
2252 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
2253 | skb = skb_peek(&sk->sk_receive_queue); | |
2254 | if (skb) | |
2255 | amount = skb->len; | |
2256 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
2257 | return put_user(amount, (int __user *)arg); | |
2258 | } | |
2259 | case SIOCGSTAMP: | |
2260 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
2261 | case SIOCGSTAMPNS: | |
2262 | return sock_get_timestampns(sk, (struct timespec __user *)arg); | |
1ce4f28b | 2263 | |
1da177e4 | 2264 | #ifdef CONFIG_INET |
40d4e3df ED |
2265 | case SIOCADDRT: |
2266 | case SIOCDELRT: | |
2267 | case SIOCDARP: | |
2268 | case SIOCGARP: | |
2269 | case SIOCSARP: | |
2270 | case SIOCGIFADDR: | |
2271 | case SIOCSIFADDR: | |
2272 | case SIOCGIFBRDADDR: | |
2273 | case SIOCSIFBRDADDR: | |
2274 | case SIOCGIFNETMASK: | |
2275 | case SIOCSIFNETMASK: | |
2276 | case SIOCGIFDSTADDR: | |
2277 | case SIOCSIFDSTADDR: | |
2278 | case SIOCSIFFLAGS: | |
40d4e3df | 2279 | return inet_dgram_ops.ioctl(sock, cmd, arg); |
1da177e4 LT |
2280 | #endif |
2281 | ||
40d4e3df ED |
2282 | default: |
2283 | return -ENOIOCTLCMD; | |
1da177e4 LT |
2284 | } |
2285 | return 0; | |
2286 | } | |
2287 | ||
40d4e3df | 2288 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
1da177e4 LT |
2289 | poll_table *wait) |
2290 | { | |
2291 | struct sock *sk = sock->sk; | |
2292 | struct packet_sock *po = pkt_sk(sk); | |
2293 | unsigned int mask = datagram_poll(file, sock, wait); | |
2294 | ||
2295 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2296 | if (po->rx_ring.pg_vec) { |
2297 | if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL)) | |
1da177e4 LT |
2298 | mask |= POLLIN | POLLRDNORM; |
2299 | } | |
2300 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2301 | spin_lock_bh(&sk->sk_write_queue.lock); |
2302 | if (po->tx_ring.pg_vec) { | |
2303 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) | |
2304 | mask |= POLLOUT | POLLWRNORM; | |
2305 | } | |
2306 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
1da177e4 LT |
2307 | return mask; |
2308 | } | |
2309 | ||
2310 | ||
2311 | /* Dirty? Well, I still did not learn better way to account | |
2312 | * for user mmaps. | |
2313 | */ | |
2314 | ||
2315 | static void packet_mm_open(struct vm_area_struct *vma) | |
2316 | { | |
2317 | struct file *file = vma->vm_file; | |
40d4e3df | 2318 | struct socket *sock = file->private_data; |
1da177e4 | 2319 | struct sock *sk = sock->sk; |
1ce4f28b | 2320 | |
1da177e4 LT |
2321 | if (sk) |
2322 | atomic_inc(&pkt_sk(sk)->mapped); | |
2323 | } | |
2324 | ||
2325 | static void packet_mm_close(struct vm_area_struct *vma) | |
2326 | { | |
2327 | struct file *file = vma->vm_file; | |
40d4e3df | 2328 | struct socket *sock = file->private_data; |
1da177e4 | 2329 | struct sock *sk = sock->sk; |
1ce4f28b | 2330 | |
1da177e4 LT |
2331 | if (sk) |
2332 | atomic_dec(&pkt_sk(sk)->mapped); | |
2333 | } | |
2334 | ||
f0f37e2f | 2335 | static const struct vm_operations_struct packet_mmap_ops = { |
40d4e3df ED |
2336 | .open = packet_mm_open, |
2337 | .close = packet_mm_close, | |
1da177e4 LT |
2338 | }; |
2339 | ||
0e3125c7 NH |
2340 | static void free_pg_vec(struct pgv *pg_vec, unsigned int order, |
2341 | unsigned int len) | |
1da177e4 LT |
2342 | { |
2343 | int i; | |
2344 | ||
4ebf0ae2 | 2345 | for (i = 0; i < len; i++) { |
0e3125c7 | 2346 | if (likely(pg_vec[i].buffer)) { |
c56b4d90 | 2347 | if (is_vmalloc_addr(pg_vec[i].buffer)) |
0e3125c7 NH |
2348 | vfree(pg_vec[i].buffer); |
2349 | else | |
2350 | free_pages((unsigned long)pg_vec[i].buffer, | |
2351 | order); | |
2352 | pg_vec[i].buffer = NULL; | |
2353 | } | |
1da177e4 LT |
2354 | } |
2355 | kfree(pg_vec); | |
2356 | } | |
2357 | ||
c56b4d90 | 2358 | static inline char *alloc_one_pg_vec_page(unsigned long order) |
4ebf0ae2 | 2359 | { |
0e3125c7 NH |
2360 | char *buffer = NULL; |
2361 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | | |
2362 | __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY; | |
2363 | ||
2364 | buffer = (char *) __get_free_pages(gfp_flags, order); | |
2365 | ||
2366 | if (buffer) | |
2367 | return buffer; | |
2368 | ||
2369 | /* | |
2370 | * __get_free_pages failed, fall back to vmalloc | |
2371 | */ | |
bbce5a59 | 2372 | buffer = vzalloc((1 << order) * PAGE_SIZE); |
719bfeaa | 2373 | |
0e3125c7 NH |
2374 | if (buffer) |
2375 | return buffer; | |
2376 | ||
2377 | /* | |
2378 | * vmalloc failed, lets dig into swap here | |
2379 | */ | |
0e3125c7 NH |
2380 | gfp_flags &= ~__GFP_NORETRY; |
2381 | buffer = (char *)__get_free_pages(gfp_flags, order); | |
2382 | if (buffer) | |
2383 | return buffer; | |
2384 | ||
2385 | /* | |
2386 | * complete and utter failure | |
2387 | */ | |
2388 | return NULL; | |
4ebf0ae2 DM |
2389 | } |
2390 | ||
0e3125c7 | 2391 | static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order) |
4ebf0ae2 DM |
2392 | { |
2393 | unsigned int block_nr = req->tp_block_nr; | |
0e3125c7 | 2394 | struct pgv *pg_vec; |
4ebf0ae2 DM |
2395 | int i; |
2396 | ||
0e3125c7 | 2397 | pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL); |
4ebf0ae2 DM |
2398 | if (unlikely(!pg_vec)) |
2399 | goto out; | |
2400 | ||
2401 | for (i = 0; i < block_nr; i++) { | |
c56b4d90 | 2402 | pg_vec[i].buffer = alloc_one_pg_vec_page(order); |
0e3125c7 | 2403 | if (unlikely(!pg_vec[i].buffer)) |
4ebf0ae2 DM |
2404 | goto out_free_pgvec; |
2405 | } | |
2406 | ||
2407 | out: | |
2408 | return pg_vec; | |
2409 | ||
2410 | out_free_pgvec: | |
2411 | free_pg_vec(pg_vec, order, block_nr); | |
2412 | pg_vec = NULL; | |
2413 | goto out; | |
2414 | } | |
1da177e4 | 2415 | |
69e3c75f JB |
2416 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
2417 | int closing, int tx_ring) | |
1da177e4 | 2418 | { |
0e3125c7 | 2419 | struct pgv *pg_vec = NULL; |
1da177e4 | 2420 | struct packet_sock *po = pkt_sk(sk); |
0e11c91e | 2421 | int was_running, order = 0; |
69e3c75f JB |
2422 | struct packet_ring_buffer *rb; |
2423 | struct sk_buff_head *rb_queue; | |
0e11c91e | 2424 | __be16 num; |
69e3c75f | 2425 | int err; |
1ce4f28b | 2426 | |
69e3c75f JB |
2427 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
2428 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; | |
1da177e4 | 2429 | |
69e3c75f JB |
2430 | err = -EBUSY; |
2431 | if (!closing) { | |
2432 | if (atomic_read(&po->mapped)) | |
2433 | goto out; | |
2434 | if (atomic_read(&rb->pending)) | |
2435 | goto out; | |
2436 | } | |
1da177e4 | 2437 | |
69e3c75f JB |
2438 | if (req->tp_block_nr) { |
2439 | /* Sanity tests and some calculations */ | |
2440 | err = -EBUSY; | |
2441 | if (unlikely(rb->pg_vec)) | |
2442 | goto out; | |
1da177e4 | 2443 | |
bbd6ef87 PM |
2444 | switch (po->tp_version) { |
2445 | case TPACKET_V1: | |
2446 | po->tp_hdrlen = TPACKET_HDRLEN; | |
2447 | break; | |
2448 | case TPACKET_V2: | |
2449 | po->tp_hdrlen = TPACKET2_HDRLEN; | |
2450 | break; | |
2451 | } | |
2452 | ||
69e3c75f | 2453 | err = -EINVAL; |
4ebf0ae2 | 2454 | if (unlikely((int)req->tp_block_size <= 0)) |
69e3c75f | 2455 | goto out; |
4ebf0ae2 | 2456 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
69e3c75f | 2457 | goto out; |
8913336a | 2458 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
69e3c75f JB |
2459 | po->tp_reserve)) |
2460 | goto out; | |
4ebf0ae2 | 2461 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
69e3c75f | 2462 | goto out; |
1da177e4 | 2463 | |
69e3c75f JB |
2464 | rb->frames_per_block = req->tp_block_size/req->tp_frame_size; |
2465 | if (unlikely(rb->frames_per_block <= 0)) | |
2466 | goto out; | |
2467 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != | |
2468 | req->tp_frame_nr)) | |
2469 | goto out; | |
1da177e4 LT |
2470 | |
2471 | err = -ENOMEM; | |
4ebf0ae2 DM |
2472 | order = get_order(req->tp_block_size); |
2473 | pg_vec = alloc_pg_vec(req, order); | |
2474 | if (unlikely(!pg_vec)) | |
1da177e4 | 2475 | goto out; |
69e3c75f JB |
2476 | } |
2477 | /* Done */ | |
2478 | else { | |
2479 | err = -EINVAL; | |
4ebf0ae2 | 2480 | if (unlikely(req->tp_frame_nr)) |
69e3c75f | 2481 | goto out; |
1da177e4 LT |
2482 | } |
2483 | ||
2484 | lock_sock(sk); | |
2485 | ||
2486 | /* Detach socket from network */ | |
2487 | spin_lock(&po->bind_lock); | |
2488 | was_running = po->running; | |
2489 | num = po->num; | |
2490 | if (was_running) { | |
2491 | __dev_remove_pack(&po->prot_hook); | |
2492 | po->num = 0; | |
2493 | po->running = 0; | |
2494 | __sock_put(sk); | |
2495 | } | |
2496 | spin_unlock(&po->bind_lock); | |
1ce4f28b | 2497 | |
1da177e4 LT |
2498 | synchronize_net(); |
2499 | ||
2500 | err = -EBUSY; | |
905db440 | 2501 | mutex_lock(&po->pg_vec_lock); |
1da177e4 LT |
2502 | if (closing || atomic_read(&po->mapped) == 0) { |
2503 | err = 0; | |
2504 | #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) | |
69e3c75f JB |
2505 | spin_lock_bh(&rb_queue->lock); |
2506 | pg_vec = XC(rb->pg_vec, pg_vec); | |
2507 | rb->frame_max = (req->tp_frame_nr - 1); | |
2508 | rb->head = 0; | |
2509 | rb->frame_size = req->tp_frame_size; | |
2510 | spin_unlock_bh(&rb_queue->lock); | |
2511 | ||
2512 | order = XC(rb->pg_vec_order, order); | |
2513 | req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr); | |
2514 | ||
2515 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
2516 | po->prot_hook.func = (po->rx_ring.pg_vec) ? | |
2517 | tpacket_rcv : packet_rcv; | |
2518 | skb_queue_purge(rb_queue); | |
1da177e4 LT |
2519 | #undef XC |
2520 | if (atomic_read(&po->mapped)) | |
40d4e3df ED |
2521 | pr_err("packet_mmap: vma is busy: %d\n", |
2522 | atomic_read(&po->mapped)); | |
1da177e4 | 2523 | } |
905db440 | 2524 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2525 | |
2526 | spin_lock(&po->bind_lock); | |
2527 | if (was_running && !po->running) { | |
2528 | sock_hold(sk); | |
2529 | po->running = 1; | |
2530 | po->num = num; | |
2531 | dev_add_pack(&po->prot_hook); | |
2532 | } | |
2533 | spin_unlock(&po->bind_lock); | |
2534 | ||
2535 | release_sock(sk); | |
2536 | ||
1da177e4 LT |
2537 | if (pg_vec) |
2538 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
2539 | out: | |
2540 | return err; | |
2541 | } | |
2542 | ||
69e3c75f JB |
2543 | static int packet_mmap(struct file *file, struct socket *sock, |
2544 | struct vm_area_struct *vma) | |
1da177e4 LT |
2545 | { |
2546 | struct sock *sk = sock->sk; | |
2547 | struct packet_sock *po = pkt_sk(sk); | |
69e3c75f JB |
2548 | unsigned long size, expected_size; |
2549 | struct packet_ring_buffer *rb; | |
1da177e4 LT |
2550 | unsigned long start; |
2551 | int err = -EINVAL; | |
2552 | int i; | |
2553 | ||
2554 | if (vma->vm_pgoff) | |
2555 | return -EINVAL; | |
2556 | ||
905db440 | 2557 | mutex_lock(&po->pg_vec_lock); |
69e3c75f JB |
2558 | |
2559 | expected_size = 0; | |
2560 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { | |
2561 | if (rb->pg_vec) { | |
2562 | expected_size += rb->pg_vec_len | |
2563 | * rb->pg_vec_pages | |
2564 | * PAGE_SIZE; | |
2565 | } | |
2566 | } | |
2567 | ||
2568 | if (expected_size == 0) | |
1da177e4 | 2569 | goto out; |
69e3c75f JB |
2570 | |
2571 | size = vma->vm_end - vma->vm_start; | |
2572 | if (size != expected_size) | |
1da177e4 LT |
2573 | goto out; |
2574 | ||
1da177e4 | 2575 | start = vma->vm_start; |
69e3c75f JB |
2576 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
2577 | if (rb->pg_vec == NULL) | |
2578 | continue; | |
2579 | ||
2580 | for (i = 0; i < rb->pg_vec_len; i++) { | |
0e3125c7 NH |
2581 | struct page *page; |
2582 | void *kaddr = rb->pg_vec[i].buffer; | |
69e3c75f JB |
2583 | int pg_num; |
2584 | ||
c56b4d90 CG |
2585 | for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) { |
2586 | page = pgv_to_page(kaddr); | |
69e3c75f JB |
2587 | err = vm_insert_page(vma, start, page); |
2588 | if (unlikely(err)) | |
2589 | goto out; | |
2590 | start += PAGE_SIZE; | |
0e3125c7 | 2591 | kaddr += PAGE_SIZE; |
69e3c75f | 2592 | } |
4ebf0ae2 | 2593 | } |
1da177e4 | 2594 | } |
69e3c75f | 2595 | |
4ebf0ae2 | 2596 | atomic_inc(&po->mapped); |
1da177e4 LT |
2597 | vma->vm_ops = &packet_mmap_ops; |
2598 | err = 0; | |
2599 | ||
2600 | out: | |
905db440 | 2601 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2602 | return err; |
2603 | } | |
1da177e4 | 2604 | |
90ddc4f0 | 2605 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
2606 | .family = PF_PACKET, |
2607 | .owner = THIS_MODULE, | |
2608 | .release = packet_release, | |
2609 | .bind = packet_bind_spkt, | |
2610 | .connect = sock_no_connect, | |
2611 | .socketpair = sock_no_socketpair, | |
2612 | .accept = sock_no_accept, | |
2613 | .getname = packet_getname_spkt, | |
2614 | .poll = datagram_poll, | |
2615 | .ioctl = packet_ioctl, | |
2616 | .listen = sock_no_listen, | |
2617 | .shutdown = sock_no_shutdown, | |
2618 | .setsockopt = sock_no_setsockopt, | |
2619 | .getsockopt = sock_no_getsockopt, | |
2620 | .sendmsg = packet_sendmsg_spkt, | |
2621 | .recvmsg = packet_recvmsg, | |
2622 | .mmap = sock_no_mmap, | |
2623 | .sendpage = sock_no_sendpage, | |
2624 | }; | |
1da177e4 | 2625 | |
90ddc4f0 | 2626 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
2627 | .family = PF_PACKET, |
2628 | .owner = THIS_MODULE, | |
2629 | .release = packet_release, | |
2630 | .bind = packet_bind, | |
2631 | .connect = sock_no_connect, | |
2632 | .socketpair = sock_no_socketpair, | |
2633 | .accept = sock_no_accept, | |
1ce4f28b | 2634 | .getname = packet_getname, |
1da177e4 LT |
2635 | .poll = packet_poll, |
2636 | .ioctl = packet_ioctl, | |
2637 | .listen = sock_no_listen, | |
2638 | .shutdown = sock_no_shutdown, | |
2639 | .setsockopt = packet_setsockopt, | |
2640 | .getsockopt = packet_getsockopt, | |
2641 | .sendmsg = packet_sendmsg, | |
2642 | .recvmsg = packet_recvmsg, | |
2643 | .mmap = packet_mmap, | |
2644 | .sendpage = sock_no_sendpage, | |
2645 | }; | |
2646 | ||
ec1b4cf7 | 2647 | static const struct net_proto_family packet_family_ops = { |
1da177e4 LT |
2648 | .family = PF_PACKET, |
2649 | .create = packet_create, | |
2650 | .owner = THIS_MODULE, | |
2651 | }; | |
2652 | ||
2653 | static struct notifier_block packet_netdev_notifier = { | |
40d4e3df | 2654 | .notifier_call = packet_notifier, |
1da177e4 LT |
2655 | }; |
2656 | ||
2657 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
2658 | |
2659 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
808f5114 | 2660 | __acquires(RCU) |
1da177e4 | 2661 | { |
e372c414 | 2662 | struct net *net = seq_file_net(seq); |
808f5114 | 2663 | |
2664 | rcu_read_lock(); | |
2665 | return seq_hlist_start_head_rcu(&net->packet.sklist, *pos); | |
1da177e4 LT |
2666 | } |
2667 | ||
2668 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2669 | { | |
1bf40954 | 2670 | struct net *net = seq_file_net(seq); |
808f5114 | 2671 | return seq_hlist_next_rcu(v, &net->packet.sklist, pos); |
1da177e4 LT |
2672 | } |
2673 | ||
2674 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
808f5114 | 2675 | __releases(RCU) |
1da177e4 | 2676 | { |
808f5114 | 2677 | rcu_read_unlock(); |
1da177e4 LT |
2678 | } |
2679 | ||
1ce4f28b | 2680 | static int packet_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
2681 | { |
2682 | if (v == SEQ_START_TOKEN) | |
2683 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
2684 | else { | |
b7ceabd9 | 2685 | struct sock *s = sk_entry(v); |
1da177e4 LT |
2686 | const struct packet_sock *po = pkt_sk(s); |
2687 | ||
2688 | seq_printf(seq, | |
2689 | "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", | |
2690 | s, | |
2691 | atomic_read(&s->sk_refcnt), | |
2692 | s->sk_type, | |
2693 | ntohs(po->num), | |
2694 | po->ifindex, | |
2695 | po->running, | |
2696 | atomic_read(&s->sk_rmem_alloc), | |
2697 | sock_i_uid(s), | |
40d4e3df | 2698 | sock_i_ino(s)); |
1da177e4 LT |
2699 | } |
2700 | ||
2701 | return 0; | |
2702 | } | |
2703 | ||
56b3d975 | 2704 | static const struct seq_operations packet_seq_ops = { |
1da177e4 LT |
2705 | .start = packet_seq_start, |
2706 | .next = packet_seq_next, | |
2707 | .stop = packet_seq_stop, | |
2708 | .show = packet_seq_show, | |
2709 | }; | |
2710 | ||
2711 | static int packet_seq_open(struct inode *inode, struct file *file) | |
2712 | { | |
e372c414 DL |
2713 | return seq_open_net(inode, file, &packet_seq_ops, |
2714 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2715 | } |
2716 | ||
da7071d7 | 2717 | static const struct file_operations packet_seq_fops = { |
1da177e4 LT |
2718 | .owner = THIS_MODULE, |
2719 | .open = packet_seq_open, | |
2720 | .read = seq_read, | |
2721 | .llseek = seq_lseek, | |
e372c414 | 2722 | .release = seq_release_net, |
1da177e4 LT |
2723 | }; |
2724 | ||
2725 | #endif | |
2726 | ||
2c8c1e72 | 2727 | static int __net_init packet_net_init(struct net *net) |
d12d01d6 | 2728 | { |
808f5114 | 2729 | spin_lock_init(&net->packet.sklist_lock); |
2aaef4e4 | 2730 | INIT_HLIST_HEAD(&net->packet.sklist); |
d12d01d6 DL |
2731 | |
2732 | if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops)) | |
2733 | return -ENOMEM; | |
2734 | ||
2735 | return 0; | |
2736 | } | |
2737 | ||
2c8c1e72 | 2738 | static void __net_exit packet_net_exit(struct net *net) |
d12d01d6 DL |
2739 | { |
2740 | proc_net_remove(net, "packet"); | |
2741 | } | |
2742 | ||
2743 | static struct pernet_operations packet_net_ops = { | |
2744 | .init = packet_net_init, | |
2745 | .exit = packet_net_exit, | |
2746 | }; | |
2747 | ||
2748 | ||
1da177e4 LT |
2749 | static void __exit packet_exit(void) |
2750 | { | |
1da177e4 | 2751 | unregister_netdevice_notifier(&packet_netdev_notifier); |
d12d01d6 | 2752 | unregister_pernet_subsys(&packet_net_ops); |
1da177e4 LT |
2753 | sock_unregister(PF_PACKET); |
2754 | proto_unregister(&packet_proto); | |
2755 | } | |
2756 | ||
2757 | static int __init packet_init(void) | |
2758 | { | |
2759 | int rc = proto_register(&packet_proto, 0); | |
2760 | ||
2761 | if (rc != 0) | |
2762 | goto out; | |
2763 | ||
2764 | sock_register(&packet_family_ops); | |
d12d01d6 | 2765 | register_pernet_subsys(&packet_net_ops); |
1da177e4 | 2766 | register_netdevice_notifier(&packet_netdev_notifier); |
1da177e4 LT |
2767 | out: |
2768 | return rc; | |
2769 | } | |
2770 | ||
2771 | module_init(packet_init); | |
2772 | module_exit(packet_exit); | |
2773 | MODULE_LICENSE("GPL"); | |
2774 | MODULE_ALIAS_NETPROTO(PF_PACKET); |