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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * PACKET - implements raw packet sockets. | |
7 | * | |
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; | |
170 | unsigned char flags; | |
171 | }; | |
172 | ||
69e3c75f | 173 | struct packet_ring_buffer { |
0e3125c7 | 174 | struct pgv *pg_vec; |
69e3c75f JB |
175 | unsigned int head; |
176 | unsigned int frames_per_block; | |
177 | unsigned int frame_size; | |
178 | unsigned int frame_max; | |
179 | ||
180 | unsigned int pg_vec_order; | |
181 | unsigned int pg_vec_pages; | |
182 | unsigned int pg_vec_len; | |
183 | ||
184 | atomic_t pending; | |
185 | }; | |
186 | ||
187 | struct packet_sock; | |
188 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg); | |
1da177e4 LT |
189 | |
190 | static void packet_flush_mclist(struct sock *sk); | |
191 | ||
192 | struct packet_sock { | |
193 | /* struct sock has to be the first member of packet_sock */ | |
194 | struct sock sk; | |
195 | struct tpacket_stats stats; | |
69e3c75f JB |
196 | struct packet_ring_buffer rx_ring; |
197 | struct packet_ring_buffer tx_ring; | |
1da177e4 | 198 | int copy_thresh; |
1da177e4 | 199 | spinlock_t bind_lock; |
905db440 | 200 | struct mutex pg_vec_lock; |
8dc41944 | 201 | unsigned int running:1, /* prot_hook is attached*/ |
80feaacb | 202 | auxdata:1, |
bfd5f4a3 SS |
203 | origdev:1, |
204 | has_vnet_hdr:1; | |
1da177e4 | 205 | int ifindex; /* bound device */ |
0e11c91e | 206 | __be16 num; |
1da177e4 | 207 | struct packet_mclist *mclist; |
1da177e4 | 208 | atomic_t mapped; |
bbd6ef87 PM |
209 | enum tpacket_versions tp_version; |
210 | unsigned int tp_hdrlen; | |
8913336a | 211 | unsigned int tp_reserve; |
69e3c75f | 212 | unsigned int tp_loss:1; |
614f60fa | 213 | unsigned int tp_tstamp; |
94b05952 | 214 | struct packet_type prot_hook ____cacheline_aligned_in_smp; |
1da177e4 LT |
215 | }; |
216 | ||
ffbc6111 HX |
217 | struct packet_skb_cb { |
218 | unsigned int origlen; | |
219 | union { | |
220 | struct sockaddr_pkt pkt; | |
221 | struct sockaddr_ll ll; | |
222 | } sa; | |
223 | }; | |
224 | ||
225 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) | |
8dc41944 | 226 | |
69e3c75f | 227 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
1da177e4 | 228 | { |
bbd6ef87 PM |
229 | union { |
230 | struct tpacket_hdr *h1; | |
231 | struct tpacket2_hdr *h2; | |
232 | void *raw; | |
233 | } h; | |
1da177e4 | 234 | |
69e3c75f | 235 | h.raw = frame; |
bbd6ef87 PM |
236 | switch (po->tp_version) { |
237 | case TPACKET_V1: | |
69e3c75f JB |
238 | h.h1->tp_status = status; |
239 | flush_dcache_page(virt_to_page(&h.h1->tp_status)); | |
bbd6ef87 PM |
240 | break; |
241 | case TPACKET_V2: | |
69e3c75f JB |
242 | h.h2->tp_status = status; |
243 | flush_dcache_page(virt_to_page(&h.h2->tp_status)); | |
bbd6ef87 | 244 | break; |
69e3c75f | 245 | default: |
40d4e3df | 246 | pr_err("TPACKET version not supported\n"); |
69e3c75f | 247 | BUG(); |
bbd6ef87 | 248 | } |
69e3c75f JB |
249 | |
250 | smp_wmb(); | |
bbd6ef87 PM |
251 | } |
252 | ||
69e3c75f | 253 | static int __packet_get_status(struct packet_sock *po, void *frame) |
bbd6ef87 PM |
254 | { |
255 | union { | |
256 | struct tpacket_hdr *h1; | |
257 | struct tpacket2_hdr *h2; | |
258 | void *raw; | |
259 | } h; | |
260 | ||
69e3c75f JB |
261 | smp_rmb(); |
262 | ||
bbd6ef87 PM |
263 | h.raw = frame; |
264 | switch (po->tp_version) { | |
265 | case TPACKET_V1: | |
69e3c75f JB |
266 | flush_dcache_page(virt_to_page(&h.h1->tp_status)); |
267 | return h.h1->tp_status; | |
bbd6ef87 | 268 | case TPACKET_V2: |
69e3c75f JB |
269 | flush_dcache_page(virt_to_page(&h.h2->tp_status)); |
270 | return h.h2->tp_status; | |
271 | default: | |
40d4e3df | 272 | pr_err("TPACKET version not supported\n"); |
69e3c75f JB |
273 | BUG(); |
274 | return 0; | |
bbd6ef87 | 275 | } |
1da177e4 | 276 | } |
69e3c75f JB |
277 | |
278 | static void *packet_lookup_frame(struct packet_sock *po, | |
279 | struct packet_ring_buffer *rb, | |
280 | unsigned int position, | |
281 | int status) | |
282 | { | |
283 | unsigned int pg_vec_pos, frame_offset; | |
284 | union { | |
285 | struct tpacket_hdr *h1; | |
286 | struct tpacket2_hdr *h2; | |
287 | void *raw; | |
288 | } h; | |
289 | ||
290 | pg_vec_pos = position / rb->frames_per_block; | |
291 | frame_offset = position % rb->frames_per_block; | |
292 | ||
0e3125c7 NH |
293 | h.raw = rb->pg_vec[pg_vec_pos].buffer + |
294 | (frame_offset * rb->frame_size); | |
69e3c75f JB |
295 | |
296 | if (status != __packet_get_status(po, h.raw)) | |
297 | return NULL; | |
298 | ||
299 | return h.raw; | |
300 | } | |
301 | ||
302 | static inline void *packet_current_frame(struct packet_sock *po, | |
303 | struct packet_ring_buffer *rb, | |
304 | int status) | |
305 | { | |
306 | return packet_lookup_frame(po, rb, rb->head, status); | |
307 | } | |
308 | ||
309 | static inline void *packet_previous_frame(struct packet_sock *po, | |
310 | struct packet_ring_buffer *rb, | |
311 | int status) | |
312 | { | |
313 | unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; | |
314 | return packet_lookup_frame(po, rb, previous, status); | |
315 | } | |
316 | ||
317 | static inline void packet_increment_head(struct packet_ring_buffer *buff) | |
318 | { | |
319 | buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; | |
320 | } | |
321 | ||
1da177e4 LT |
322 | static inline struct packet_sock *pkt_sk(struct sock *sk) |
323 | { | |
324 | return (struct packet_sock *)sk; | |
325 | } | |
326 | ||
327 | static void packet_sock_destruct(struct sock *sk) | |
328 | { | |
ed85b565 RC |
329 | skb_queue_purge(&sk->sk_error_queue); |
330 | ||
547b792c IJ |
331 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
332 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); | |
1da177e4 LT |
333 | |
334 | if (!sock_flag(sk, SOCK_DEAD)) { | |
40d4e3df | 335 | pr_err("Attempt to release alive packet socket: %p\n", sk); |
1da177e4 LT |
336 | return; |
337 | } | |
338 | ||
17ab56a2 | 339 | sk_refcnt_debug_dec(sk); |
1da177e4 LT |
340 | } |
341 | ||
342 | ||
90ddc4f0 | 343 | static const struct proto_ops packet_ops; |
1da177e4 | 344 | |
90ddc4f0 | 345 | static const struct proto_ops packet_ops_spkt; |
1da177e4 | 346 | |
40d4e3df ED |
347 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
348 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
349 | { |
350 | struct sock *sk; | |
351 | struct sockaddr_pkt *spkt; | |
352 | ||
353 | /* | |
354 | * When we registered the protocol we saved the socket in the data | |
355 | * field for just this event. | |
356 | */ | |
357 | ||
358 | sk = pt->af_packet_priv; | |
1ce4f28b | 359 | |
1da177e4 LT |
360 | /* |
361 | * Yank back the headers [hope the device set this | |
362 | * right or kerboom...] | |
363 | * | |
364 | * Incoming packets have ll header pulled, | |
365 | * push it back. | |
366 | * | |
98e399f8 | 367 | * For outgoing ones skb->data == skb_mac_header(skb) |
1da177e4 LT |
368 | * so that this procedure is noop. |
369 | */ | |
370 | ||
371 | if (skb->pkt_type == PACKET_LOOPBACK) | |
372 | goto out; | |
373 | ||
09ad9bc7 | 374 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
375 | goto out; |
376 | ||
40d4e3df ED |
377 | skb = skb_share_check(skb, GFP_ATOMIC); |
378 | if (skb == NULL) | |
1da177e4 LT |
379 | goto oom; |
380 | ||
381 | /* drop any routing info */ | |
adf30907 | 382 | skb_dst_drop(skb); |
1da177e4 | 383 | |
84531c24 PO |
384 | /* drop conntrack reference */ |
385 | nf_reset(skb); | |
386 | ||
ffbc6111 | 387 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
1da177e4 | 388 | |
98e399f8 | 389 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
390 | |
391 | /* | |
392 | * The SOCK_PACKET socket receives _all_ frames. | |
393 | */ | |
394 | ||
395 | spkt->spkt_family = dev->type; | |
396 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
397 | spkt->spkt_protocol = skb->protocol; | |
398 | ||
399 | /* | |
400 | * Charge the memory to the socket. This is done specifically | |
401 | * to prevent sockets using all the memory up. | |
402 | */ | |
403 | ||
40d4e3df | 404 | if (sock_queue_rcv_skb(sk, skb) == 0) |
1da177e4 LT |
405 | return 0; |
406 | ||
407 | out: | |
408 | kfree_skb(skb); | |
409 | oom: | |
410 | return 0; | |
411 | } | |
412 | ||
413 | ||
414 | /* | |
415 | * Output a raw packet to a device layer. This bypasses all the other | |
416 | * protocol layers and you must therefore supply it with a complete frame | |
417 | */ | |
1ce4f28b | 418 | |
1da177e4 LT |
419 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, |
420 | struct msghdr *msg, size_t len) | |
421 | { | |
422 | struct sock *sk = sock->sk; | |
40d4e3df | 423 | struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name; |
1a35ca80 | 424 | struct sk_buff *skb = NULL; |
1da177e4 | 425 | struct net_device *dev; |
40d4e3df | 426 | __be16 proto = 0; |
1da177e4 | 427 | int err; |
1ce4f28b | 428 | |
1da177e4 | 429 | /* |
1ce4f28b | 430 | * Get and verify the address. |
1da177e4 LT |
431 | */ |
432 | ||
40d4e3df | 433 | if (saddr) { |
1da177e4 | 434 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
40d4e3df ED |
435 | return -EINVAL; |
436 | if (msg->msg_namelen == sizeof(struct sockaddr_pkt)) | |
437 | proto = saddr->spkt_protocol; | |
438 | } else | |
439 | return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */ | |
1da177e4 LT |
440 | |
441 | /* | |
1ce4f28b | 442 | * Find the device first to size check it |
1da177e4 LT |
443 | */ |
444 | ||
445 | saddr->spkt_device[13] = 0; | |
1a35ca80 | 446 | retry: |
654d1f8a ED |
447 | rcu_read_lock(); |
448 | dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); | |
1da177e4 LT |
449 | err = -ENODEV; |
450 | if (dev == NULL) | |
451 | goto out_unlock; | |
1ce4f28b | 452 | |
d5e76b0a DM |
453 | err = -ENETDOWN; |
454 | if (!(dev->flags & IFF_UP)) | |
455 | goto out_unlock; | |
456 | ||
1da177e4 | 457 | /* |
40d4e3df ED |
458 | * You may not queue a frame bigger than the mtu. This is the lowest level |
459 | * raw protocol and you must do your own fragmentation at this level. | |
1da177e4 | 460 | */ |
1ce4f28b | 461 | |
1da177e4 | 462 | err = -EMSGSIZE; |
8ae55f04 | 463 | if (len > dev->mtu + dev->hard_header_len) |
1da177e4 LT |
464 | goto out_unlock; |
465 | ||
1a35ca80 ED |
466 | if (!skb) { |
467 | size_t reserved = LL_RESERVED_SPACE(dev); | |
468 | unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0; | |
469 | ||
470 | rcu_read_unlock(); | |
471 | skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL); | |
472 | if (skb == NULL) | |
473 | return -ENOBUFS; | |
474 | /* FIXME: Save some space for broken drivers that write a hard | |
475 | * header at transmission time by themselves. PPP is the notable | |
476 | * one here. This should really be fixed at the driver level. | |
477 | */ | |
478 | skb_reserve(skb, reserved); | |
479 | skb_reset_network_header(skb); | |
480 | ||
481 | /* Try to align data part correctly */ | |
482 | if (hhlen) { | |
483 | skb->data -= hhlen; | |
484 | skb->tail -= hhlen; | |
485 | if (len < hhlen) | |
486 | skb_reset_network_header(skb); | |
487 | } | |
488 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
489 | if (err) | |
490 | goto out_free; | |
491 | goto retry; | |
1da177e4 LT |
492 | } |
493 | ||
1a35ca80 | 494 | |
1da177e4 LT |
495 | skb->protocol = proto; |
496 | skb->dev = dev; | |
497 | skb->priority = sk->sk_priority; | |
2d37a186 | 498 | skb->mark = sk->sk_mark; |
2244d07b | 499 | err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
ed85b565 RC |
500 | if (err < 0) |
501 | goto out_unlock; | |
1da177e4 LT |
502 | |
503 | dev_queue_xmit(skb); | |
654d1f8a | 504 | rcu_read_unlock(); |
40d4e3df | 505 | return len; |
1da177e4 | 506 | |
1da177e4 | 507 | out_unlock: |
654d1f8a | 508 | rcu_read_unlock(); |
1a35ca80 ED |
509 | out_free: |
510 | kfree_skb(skb); | |
1da177e4 LT |
511 | return err; |
512 | } | |
1da177e4 | 513 | |
dbcb5855 DM |
514 | static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk, |
515 | unsigned int res) | |
1da177e4 LT |
516 | { |
517 | struct sk_filter *filter; | |
fda9ef5d DM |
518 | |
519 | rcu_read_lock_bh(); | |
a898def2 | 520 | filter = rcu_dereference_bh(sk->sk_filter); |
dbcb5855 | 521 | if (filter != NULL) |
93aaae2e | 522 | res = sk_run_filter(skb, filter->insns); |
fda9ef5d | 523 | rcu_read_unlock_bh(); |
1da177e4 | 524 | |
dbcb5855 | 525 | return res; |
1da177e4 LT |
526 | } |
527 | ||
528 | /* | |
529 | This function makes lazy skb cloning in hope that most of packets | |
530 | are discarded by BPF. | |
531 | ||
532 | Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
533 | and skb->cb are mangled. It works because (and until) packets | |
534 | falling here are owned by current CPU. Output packets are cloned | |
535 | by dev_queue_xmit_nit(), input packets are processed by net_bh | |
536 | sequencially, so that if we return skb to original state on exit, | |
537 | we will not harm anyone. | |
538 | */ | |
539 | ||
40d4e3df ED |
540 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
541 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
542 | { |
543 | struct sock *sk; | |
544 | struct sockaddr_ll *sll; | |
545 | struct packet_sock *po; | |
40d4e3df | 546 | u8 *skb_head = skb->data; |
1da177e4 | 547 | int skb_len = skb->len; |
dbcb5855 | 548 | unsigned int snaplen, res; |
1da177e4 LT |
549 | |
550 | if (skb->pkt_type == PACKET_LOOPBACK) | |
551 | goto drop; | |
552 | ||
553 | sk = pt->af_packet_priv; | |
554 | po = pkt_sk(sk); | |
555 | ||
09ad9bc7 | 556 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
557 | goto drop; |
558 | ||
1da177e4 LT |
559 | skb->dev = dev; |
560 | ||
3b04ddde | 561 | if (dev->header_ops) { |
1da177e4 LT |
562 | /* The device has an explicit notion of ll header, |
563 | exported to higher levels. | |
564 | ||
565 | Otherwise, the device hides datails of it frame | |
566 | structure, so that corresponding packet head | |
567 | never delivered to user. | |
568 | */ | |
569 | if (sk->sk_type != SOCK_DGRAM) | |
98e399f8 | 570 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
571 | else if (skb->pkt_type == PACKET_OUTGOING) { |
572 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 573 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
574 | } |
575 | } | |
576 | ||
577 | snaplen = skb->len; | |
578 | ||
dbcb5855 DM |
579 | res = run_filter(skb, sk, snaplen); |
580 | if (!res) | |
fda9ef5d | 581 | goto drop_n_restore; |
dbcb5855 DM |
582 | if (snaplen > res) |
583 | snaplen = res; | |
1da177e4 LT |
584 | |
585 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
586 | (unsigned)sk->sk_rcvbuf) | |
587 | goto drop_n_acct; | |
588 | ||
589 | if (skb_shared(skb)) { | |
590 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
591 | if (nskb == NULL) | |
592 | goto drop_n_acct; | |
593 | ||
594 | if (skb_head != skb->data) { | |
595 | skb->data = skb_head; | |
596 | skb->len = skb_len; | |
597 | } | |
598 | kfree_skb(skb); | |
599 | skb = nskb; | |
600 | } | |
601 | ||
ffbc6111 HX |
602 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
603 | sizeof(skb->cb)); | |
604 | ||
605 | sll = &PACKET_SKB_CB(skb)->sa.ll; | |
1da177e4 LT |
606 | sll->sll_family = AF_PACKET; |
607 | sll->sll_hatype = dev->type; | |
608 | sll->sll_protocol = skb->protocol; | |
609 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 610 | if (unlikely(po->origdev)) |
80feaacb PWJ |
611 | sll->sll_ifindex = orig_dev->ifindex; |
612 | else | |
613 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 614 | |
b95cce35 | 615 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 | 616 | |
ffbc6111 | 617 | PACKET_SKB_CB(skb)->origlen = skb->len; |
8dc41944 | 618 | |
1da177e4 LT |
619 | if (pskb_trim(skb, snaplen)) |
620 | goto drop_n_acct; | |
621 | ||
622 | skb_set_owner_r(skb, sk); | |
623 | skb->dev = NULL; | |
adf30907 | 624 | skb_dst_drop(skb); |
1da177e4 | 625 | |
84531c24 PO |
626 | /* drop conntrack reference */ |
627 | nf_reset(skb); | |
628 | ||
1da177e4 LT |
629 | spin_lock(&sk->sk_receive_queue.lock); |
630 | po->stats.tp_packets++; | |
3b885787 | 631 | skb->dropcount = atomic_read(&sk->sk_drops); |
1da177e4 LT |
632 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
633 | spin_unlock(&sk->sk_receive_queue.lock); | |
634 | sk->sk_data_ready(sk, skb->len); | |
635 | return 0; | |
636 | ||
637 | drop_n_acct: | |
3b885787 | 638 | po->stats.tp_drops = atomic_inc_return(&sk->sk_drops); |
1da177e4 LT |
639 | |
640 | drop_n_restore: | |
641 | if (skb_head != skb->data && skb_shared(skb)) { | |
642 | skb->data = skb_head; | |
643 | skb->len = skb_len; | |
644 | } | |
645 | drop: | |
ead2ceb0 | 646 | consume_skb(skb); |
1da177e4 LT |
647 | return 0; |
648 | } | |
649 | ||
40d4e3df ED |
650 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
651 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
652 | { |
653 | struct sock *sk; | |
654 | struct packet_sock *po; | |
655 | struct sockaddr_ll *sll; | |
bbd6ef87 PM |
656 | union { |
657 | struct tpacket_hdr *h1; | |
658 | struct tpacket2_hdr *h2; | |
659 | void *raw; | |
660 | } h; | |
40d4e3df | 661 | u8 *skb_head = skb->data; |
1da177e4 | 662 | int skb_len = skb->len; |
dbcb5855 | 663 | unsigned int snaplen, res; |
1da177e4 | 664 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
bbd6ef87 | 665 | unsigned short macoff, netoff, hdrlen; |
1da177e4 | 666 | struct sk_buff *copy_skb = NULL; |
b7aa0bf7 | 667 | struct timeval tv; |
bbd6ef87 | 668 | struct timespec ts; |
614f60fa | 669 | struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb); |
1da177e4 LT |
670 | |
671 | if (skb->pkt_type == PACKET_LOOPBACK) | |
672 | goto drop; | |
673 | ||
674 | sk = pt->af_packet_priv; | |
675 | po = pkt_sk(sk); | |
676 | ||
09ad9bc7 | 677 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
678 | goto drop; |
679 | ||
3b04ddde | 680 | if (dev->header_ops) { |
1da177e4 | 681 | if (sk->sk_type != SOCK_DGRAM) |
98e399f8 | 682 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
683 | else if (skb->pkt_type == PACKET_OUTGOING) { |
684 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 685 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
686 | } |
687 | } | |
688 | ||
8dc41944 HX |
689 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
690 | status |= TP_STATUS_CSUMNOTREADY; | |
691 | ||
1da177e4 LT |
692 | snaplen = skb->len; |
693 | ||
dbcb5855 DM |
694 | res = run_filter(skb, sk, snaplen); |
695 | if (!res) | |
fda9ef5d | 696 | goto drop_n_restore; |
dbcb5855 DM |
697 | if (snaplen > res) |
698 | snaplen = res; | |
1da177e4 LT |
699 | |
700 | if (sk->sk_type == SOCK_DGRAM) { | |
8913336a PM |
701 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
702 | po->tp_reserve; | |
1da177e4 | 703 | } else { |
bbe735e4 | 704 | unsigned maclen = skb_network_offset(skb); |
bbd6ef87 | 705 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
8913336a PM |
706 | (maclen < 16 ? 16 : maclen)) + |
707 | po->tp_reserve; | |
1da177e4 LT |
708 | macoff = netoff - maclen; |
709 | } | |
710 | ||
69e3c75f | 711 | if (macoff + snaplen > po->rx_ring.frame_size) { |
1da177e4 LT |
712 | if (po->copy_thresh && |
713 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < | |
714 | (unsigned)sk->sk_rcvbuf) { | |
715 | if (skb_shared(skb)) { | |
716 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
717 | } else { | |
718 | copy_skb = skb_get(skb); | |
719 | skb_head = skb->data; | |
720 | } | |
721 | if (copy_skb) | |
722 | skb_set_owner_r(copy_skb, sk); | |
723 | } | |
69e3c75f | 724 | snaplen = po->rx_ring.frame_size - macoff; |
1da177e4 LT |
725 | if ((int)snaplen < 0) |
726 | snaplen = 0; | |
727 | } | |
1da177e4 LT |
728 | |
729 | spin_lock(&sk->sk_receive_queue.lock); | |
69e3c75f | 730 | h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL); |
bbd6ef87 | 731 | if (!h.raw) |
1da177e4 | 732 | goto ring_is_full; |
69e3c75f | 733 | packet_increment_head(&po->rx_ring); |
1da177e4 LT |
734 | po->stats.tp_packets++; |
735 | if (copy_skb) { | |
736 | status |= TP_STATUS_COPY; | |
737 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
738 | } | |
739 | if (!po->stats.tp_drops) | |
740 | status &= ~TP_STATUS_LOSING; | |
741 | spin_unlock(&sk->sk_receive_queue.lock); | |
742 | ||
bbd6ef87 | 743 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
1da177e4 | 744 | |
bbd6ef87 PM |
745 | switch (po->tp_version) { |
746 | case TPACKET_V1: | |
747 | h.h1->tp_len = skb->len; | |
748 | h.h1->tp_snaplen = snaplen; | |
749 | h.h1->tp_mac = macoff; | |
750 | h.h1->tp_net = netoff; | |
614f60fa SM |
751 | if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE) |
752 | && shhwtstamps->syststamp.tv64) | |
753 | tv = ktime_to_timeval(shhwtstamps->syststamp); | |
754 | else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE) | |
755 | && shhwtstamps->hwtstamp.tv64) | |
756 | tv = ktime_to_timeval(shhwtstamps->hwtstamp); | |
757 | else if (skb->tstamp.tv64) | |
bbd6ef87 PM |
758 | tv = ktime_to_timeval(skb->tstamp); |
759 | else | |
760 | do_gettimeofday(&tv); | |
761 | h.h1->tp_sec = tv.tv_sec; | |
762 | h.h1->tp_usec = tv.tv_usec; | |
763 | hdrlen = sizeof(*h.h1); | |
764 | break; | |
765 | case TPACKET_V2: | |
766 | h.h2->tp_len = skb->len; | |
767 | h.h2->tp_snaplen = snaplen; | |
768 | h.h2->tp_mac = macoff; | |
769 | h.h2->tp_net = netoff; | |
614f60fa SM |
770 | if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE) |
771 | && shhwtstamps->syststamp.tv64) | |
772 | ts = ktime_to_timespec(shhwtstamps->syststamp); | |
773 | else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE) | |
774 | && shhwtstamps->hwtstamp.tv64) | |
775 | ts = ktime_to_timespec(shhwtstamps->hwtstamp); | |
776 | else if (skb->tstamp.tv64) | |
bbd6ef87 PM |
777 | ts = ktime_to_timespec(skb->tstamp); |
778 | else | |
779 | getnstimeofday(&ts); | |
780 | h.h2->tp_sec = ts.tv_sec; | |
781 | h.h2->tp_nsec = ts.tv_nsec; | |
05423b24 | 782 | h.h2->tp_vlan_tci = vlan_tx_tag_get(skb); |
bbd6ef87 PM |
783 | hdrlen = sizeof(*h.h2); |
784 | break; | |
785 | default: | |
786 | BUG(); | |
787 | } | |
1da177e4 | 788 | |
bbd6ef87 | 789 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
b95cce35 | 790 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 LT |
791 | sll->sll_family = AF_PACKET; |
792 | sll->sll_hatype = dev->type; | |
793 | sll->sll_protocol = skb->protocol; | |
794 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 795 | if (unlikely(po->origdev)) |
80feaacb PWJ |
796 | sll->sll_ifindex = orig_dev->ifindex; |
797 | else | |
798 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 799 | |
bbd6ef87 | 800 | __packet_set_status(po, h.raw, status); |
e16aa207 | 801 | smp_mb(); |
1da177e4 LT |
802 | { |
803 | struct page *p_start, *p_end; | |
bbd6ef87 | 804 | u8 *h_end = h.raw + macoff + snaplen - 1; |
1da177e4 | 805 | |
bbd6ef87 | 806 | p_start = virt_to_page(h.raw); |
1da177e4 LT |
807 | p_end = virt_to_page(h_end); |
808 | while (p_start <= p_end) { | |
809 | flush_dcache_page(p_start); | |
810 | p_start++; | |
811 | } | |
812 | } | |
813 | ||
814 | sk->sk_data_ready(sk, 0); | |
815 | ||
816 | drop_n_restore: | |
817 | if (skb_head != skb->data && skb_shared(skb)) { | |
818 | skb->data = skb_head; | |
819 | skb->len = skb_len; | |
820 | } | |
821 | drop: | |
1ce4f28b | 822 | kfree_skb(skb); |
1da177e4 LT |
823 | return 0; |
824 | ||
825 | ring_is_full: | |
826 | po->stats.tp_drops++; | |
827 | spin_unlock(&sk->sk_receive_queue.lock); | |
828 | ||
829 | sk->sk_data_ready(sk, 0); | |
acb5d75b | 830 | kfree_skb(copy_skb); |
1da177e4 LT |
831 | goto drop_n_restore; |
832 | } | |
833 | ||
69e3c75f JB |
834 | static void tpacket_destruct_skb(struct sk_buff *skb) |
835 | { | |
836 | struct packet_sock *po = pkt_sk(skb->sk); | |
40d4e3df | 837 | void *ph; |
1da177e4 | 838 | |
69e3c75f | 839 | BUG_ON(skb == NULL); |
1da177e4 | 840 | |
69e3c75f JB |
841 | if (likely(po->tx_ring.pg_vec)) { |
842 | ph = skb_shinfo(skb)->destructor_arg; | |
843 | BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING); | |
844 | BUG_ON(atomic_read(&po->tx_ring.pending) == 0); | |
845 | atomic_dec(&po->tx_ring.pending); | |
846 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE); | |
847 | } | |
848 | ||
849 | sock_wfree(skb); | |
850 | } | |
851 | ||
40d4e3df ED |
852 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
853 | void *frame, struct net_device *dev, int size_max, | |
854 | __be16 proto, unsigned char *addr) | |
69e3c75f JB |
855 | { |
856 | union { | |
857 | struct tpacket_hdr *h1; | |
858 | struct tpacket2_hdr *h2; | |
859 | void *raw; | |
860 | } ph; | |
861 | int to_write, offset, len, tp_len, nr_frags, len_max; | |
862 | struct socket *sock = po->sk.sk_socket; | |
863 | struct page *page; | |
864 | void *data; | |
865 | int err; | |
866 | ||
867 | ph.raw = frame; | |
868 | ||
869 | skb->protocol = proto; | |
870 | skb->dev = dev; | |
871 | skb->priority = po->sk.sk_priority; | |
2d37a186 | 872 | skb->mark = po->sk.sk_mark; |
69e3c75f JB |
873 | skb_shinfo(skb)->destructor_arg = ph.raw; |
874 | ||
875 | switch (po->tp_version) { | |
876 | case TPACKET_V2: | |
877 | tp_len = ph.h2->tp_len; | |
878 | break; | |
879 | default: | |
880 | tp_len = ph.h1->tp_len; | |
881 | break; | |
882 | } | |
883 | if (unlikely(tp_len > size_max)) { | |
40d4e3df | 884 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); |
69e3c75f JB |
885 | return -EMSGSIZE; |
886 | } | |
887 | ||
888 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
889 | skb_reset_network_header(skb); | |
890 | ||
891 | data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll); | |
892 | to_write = tp_len; | |
893 | ||
894 | if (sock->type == SOCK_DGRAM) { | |
895 | err = dev_hard_header(skb, dev, ntohs(proto), addr, | |
896 | NULL, tp_len); | |
897 | if (unlikely(err < 0)) | |
898 | return -EINVAL; | |
40d4e3df | 899 | } else if (dev->hard_header_len) { |
69e3c75f JB |
900 | /* net device doesn't like empty head */ |
901 | if (unlikely(tp_len <= dev->hard_header_len)) { | |
40d4e3df ED |
902 | pr_err("packet size is too short (%d < %d)\n", |
903 | tp_len, dev->hard_header_len); | |
69e3c75f JB |
904 | return -EINVAL; |
905 | } | |
906 | ||
907 | skb_push(skb, dev->hard_header_len); | |
908 | err = skb_store_bits(skb, 0, data, | |
909 | dev->hard_header_len); | |
910 | if (unlikely(err)) | |
911 | return err; | |
912 | ||
913 | data += dev->hard_header_len; | |
914 | to_write -= dev->hard_header_len; | |
915 | } | |
916 | ||
917 | err = -EFAULT; | |
918 | page = virt_to_page(data); | |
919 | offset = offset_in_page(data); | |
920 | len_max = PAGE_SIZE - offset; | |
921 | len = ((to_write > len_max) ? len_max : to_write); | |
922 | ||
923 | skb->data_len = to_write; | |
924 | skb->len += to_write; | |
925 | skb->truesize += to_write; | |
926 | atomic_add(to_write, &po->sk.sk_wmem_alloc); | |
927 | ||
928 | while (likely(to_write)) { | |
929 | nr_frags = skb_shinfo(skb)->nr_frags; | |
930 | ||
931 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { | |
40d4e3df ED |
932 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
933 | MAX_SKB_FRAGS); | |
69e3c75f JB |
934 | return -EFAULT; |
935 | } | |
936 | ||
937 | flush_dcache_page(page); | |
938 | get_page(page); | |
939 | skb_fill_page_desc(skb, | |
940 | nr_frags, | |
941 | page++, offset, len); | |
942 | to_write -= len; | |
943 | offset = 0; | |
944 | len_max = PAGE_SIZE; | |
945 | len = ((to_write > len_max) ? len_max : to_write); | |
946 | } | |
947 | ||
948 | return tp_len; | |
949 | } | |
950 | ||
951 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) | |
952 | { | |
953 | struct socket *sock; | |
954 | struct sk_buff *skb; | |
955 | struct net_device *dev; | |
956 | __be16 proto; | |
957 | int ifindex, err, reserve = 0; | |
40d4e3df ED |
958 | void *ph; |
959 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; | |
69e3c75f JB |
960 | int tp_len, size_max; |
961 | unsigned char *addr; | |
962 | int len_sum = 0; | |
963 | int status = 0; | |
964 | ||
965 | sock = po->sk.sk_socket; | |
966 | ||
967 | mutex_lock(&po->pg_vec_lock); | |
968 | ||
969 | err = -EBUSY; | |
970 | if (saddr == NULL) { | |
971 | ifindex = po->ifindex; | |
972 | proto = po->num; | |
973 | addr = NULL; | |
974 | } else { | |
975 | err = -EINVAL; | |
976 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
977 | goto out; | |
978 | if (msg->msg_namelen < (saddr->sll_halen | |
979 | + offsetof(struct sockaddr_ll, | |
980 | sll_addr))) | |
981 | goto out; | |
982 | ifindex = saddr->sll_ifindex; | |
983 | proto = saddr->sll_protocol; | |
984 | addr = saddr->sll_addr; | |
985 | } | |
986 | ||
987 | dev = dev_get_by_index(sock_net(&po->sk), ifindex); | |
988 | err = -ENXIO; | |
989 | if (unlikely(dev == NULL)) | |
990 | goto out; | |
991 | ||
992 | reserve = dev->hard_header_len; | |
993 | ||
994 | err = -ENETDOWN; | |
995 | if (unlikely(!(dev->flags & IFF_UP))) | |
996 | goto out_put; | |
997 | ||
998 | size_max = po->tx_ring.frame_size | |
b5dd884e | 999 | - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
69e3c75f JB |
1000 | |
1001 | if (size_max > dev->mtu + reserve) | |
1002 | size_max = dev->mtu + reserve; | |
1003 | ||
1004 | do { | |
1005 | ph = packet_current_frame(po, &po->tx_ring, | |
1006 | TP_STATUS_SEND_REQUEST); | |
1007 | ||
1008 | if (unlikely(ph == NULL)) { | |
1009 | schedule(); | |
1010 | continue; | |
1011 | } | |
1012 | ||
1013 | status = TP_STATUS_SEND_REQUEST; | |
1014 | skb = sock_alloc_send_skb(&po->sk, | |
1015 | LL_ALLOCATED_SPACE(dev) | |
1016 | + sizeof(struct sockaddr_ll), | |
1017 | 0, &err); | |
1018 | ||
1019 | if (unlikely(skb == NULL)) | |
1020 | goto out_status; | |
1021 | ||
1022 | tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto, | |
1023 | addr); | |
1024 | ||
1025 | if (unlikely(tp_len < 0)) { | |
1026 | if (po->tp_loss) { | |
1027 | __packet_set_status(po, ph, | |
1028 | TP_STATUS_AVAILABLE); | |
1029 | packet_increment_head(&po->tx_ring); | |
1030 | kfree_skb(skb); | |
1031 | continue; | |
1032 | } else { | |
1033 | status = TP_STATUS_WRONG_FORMAT; | |
1034 | err = tp_len; | |
1035 | goto out_status; | |
1036 | } | |
1037 | } | |
1038 | ||
1039 | skb->destructor = tpacket_destruct_skb; | |
1040 | __packet_set_status(po, ph, TP_STATUS_SENDING); | |
1041 | atomic_inc(&po->tx_ring.pending); | |
1042 | ||
1043 | status = TP_STATUS_SEND_REQUEST; | |
1044 | err = dev_queue_xmit(skb); | |
eb70df13 JP |
1045 | if (unlikely(err > 0)) { |
1046 | err = net_xmit_errno(err); | |
1047 | if (err && __packet_get_status(po, ph) == | |
1048 | TP_STATUS_AVAILABLE) { | |
1049 | /* skb was destructed already */ | |
1050 | skb = NULL; | |
1051 | goto out_status; | |
1052 | } | |
1053 | /* | |
1054 | * skb was dropped but not destructed yet; | |
1055 | * let's treat it like congestion or err < 0 | |
1056 | */ | |
1057 | err = 0; | |
1058 | } | |
69e3c75f JB |
1059 | packet_increment_head(&po->tx_ring); |
1060 | len_sum += tp_len; | |
f64f9e71 JP |
1061 | } while (likely((ph != NULL) || |
1062 | ((!(msg->msg_flags & MSG_DONTWAIT)) && | |
1063 | (atomic_read(&po->tx_ring.pending)))) | |
1064 | ); | |
69e3c75f JB |
1065 | |
1066 | err = len_sum; | |
1067 | goto out_put; | |
1068 | ||
69e3c75f JB |
1069 | out_status: |
1070 | __packet_set_status(po, ph, status); | |
1071 | kfree_skb(skb); | |
1072 | out_put: | |
1073 | dev_put(dev); | |
1074 | out: | |
1075 | mutex_unlock(&po->pg_vec_lock); | |
1076 | return err; | |
1077 | } | |
69e3c75f | 1078 | |
bfd5f4a3 SS |
1079 | static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad, |
1080 | size_t reserve, size_t len, | |
1081 | size_t linear, int noblock, | |
1082 | int *err) | |
1083 | { | |
1084 | struct sk_buff *skb; | |
1085 | ||
1086 | /* Under a page? Don't bother with paged skb. */ | |
1087 | if (prepad + len < PAGE_SIZE || !linear) | |
1088 | linear = len; | |
1089 | ||
1090 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, | |
1091 | err); | |
1092 | if (!skb) | |
1093 | return NULL; | |
1094 | ||
1095 | skb_reserve(skb, reserve); | |
1096 | skb_put(skb, linear); | |
1097 | skb->data_len = len - linear; | |
1098 | skb->len += len - linear; | |
1099 | ||
1100 | return skb; | |
1101 | } | |
1102 | ||
69e3c75f | 1103 | static int packet_snd(struct socket *sock, |
1da177e4 LT |
1104 | struct msghdr *msg, size_t len) |
1105 | { | |
1106 | struct sock *sk = sock->sk; | |
40d4e3df | 1107 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
1da177e4 LT |
1108 | struct sk_buff *skb; |
1109 | struct net_device *dev; | |
0e11c91e | 1110 | __be16 proto; |
1da177e4 LT |
1111 | unsigned char *addr; |
1112 | int ifindex, err, reserve = 0; | |
bfd5f4a3 SS |
1113 | struct virtio_net_hdr vnet_hdr = { 0 }; |
1114 | int offset = 0; | |
1115 | int vnet_hdr_len; | |
1116 | struct packet_sock *po = pkt_sk(sk); | |
1117 | unsigned short gso_type = 0; | |
1da177e4 LT |
1118 | |
1119 | /* | |
1ce4f28b | 1120 | * Get and verify the address. |
1da177e4 | 1121 | */ |
1ce4f28b | 1122 | |
1da177e4 | 1123 | if (saddr == NULL) { |
1da177e4 LT |
1124 | ifindex = po->ifindex; |
1125 | proto = po->num; | |
1126 | addr = NULL; | |
1127 | } else { | |
1128 | err = -EINVAL; | |
1129 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
1130 | goto out; | |
0fb375fb EB |
1131 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
1132 | goto out; | |
1da177e4 LT |
1133 | ifindex = saddr->sll_ifindex; |
1134 | proto = saddr->sll_protocol; | |
1135 | addr = saddr->sll_addr; | |
1136 | } | |
1137 | ||
1138 | ||
3b1e0a65 | 1139 | dev = dev_get_by_index(sock_net(sk), ifindex); |
1da177e4 LT |
1140 | err = -ENXIO; |
1141 | if (dev == NULL) | |
1142 | goto out_unlock; | |
1143 | if (sock->type == SOCK_RAW) | |
1144 | reserve = dev->hard_header_len; | |
1145 | ||
d5e76b0a DM |
1146 | err = -ENETDOWN; |
1147 | if (!(dev->flags & IFF_UP)) | |
1148 | goto out_unlock; | |
1149 | ||
bfd5f4a3 SS |
1150 | if (po->has_vnet_hdr) { |
1151 | vnet_hdr_len = sizeof(vnet_hdr); | |
1152 | ||
1153 | err = -EINVAL; | |
1154 | if (len < vnet_hdr_len) | |
1155 | goto out_unlock; | |
1156 | ||
1157 | len -= vnet_hdr_len; | |
1158 | ||
1159 | err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov, | |
1160 | vnet_hdr_len); | |
1161 | if (err < 0) | |
1162 | goto out_unlock; | |
1163 | ||
1164 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && | |
1165 | (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 > | |
1166 | vnet_hdr.hdr_len)) | |
1167 | vnet_hdr.hdr_len = vnet_hdr.csum_start + | |
1168 | vnet_hdr.csum_offset + 2; | |
1169 | ||
1170 | err = -EINVAL; | |
1171 | if (vnet_hdr.hdr_len > len) | |
1172 | goto out_unlock; | |
1173 | ||
1174 | if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
1175 | switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
1176 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
1177 | gso_type = SKB_GSO_TCPV4; | |
1178 | break; | |
1179 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
1180 | gso_type = SKB_GSO_TCPV6; | |
1181 | break; | |
1182 | case VIRTIO_NET_HDR_GSO_UDP: | |
1183 | gso_type = SKB_GSO_UDP; | |
1184 | break; | |
1185 | default: | |
1186 | goto out_unlock; | |
1187 | } | |
1188 | ||
1189 | if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
1190 | gso_type |= SKB_GSO_TCP_ECN; | |
1191 | ||
1192 | if (vnet_hdr.gso_size == 0) | |
1193 | goto out_unlock; | |
1194 | ||
1195 | } | |
1196 | } | |
1197 | ||
1da177e4 | 1198 | err = -EMSGSIZE; |
bfd5f4a3 | 1199 | if (!gso_type && (len > dev->mtu+reserve)) |
1da177e4 LT |
1200 | goto out_unlock; |
1201 | ||
bfd5f4a3 SS |
1202 | err = -ENOBUFS; |
1203 | skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev), | |
1204 | LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len, | |
1205 | msg->msg_flags & MSG_DONTWAIT, &err); | |
40d4e3df | 1206 | if (skb == NULL) |
1da177e4 LT |
1207 | goto out_unlock; |
1208 | ||
bfd5f4a3 | 1209 | skb_set_network_header(skb, reserve); |
1da177e4 | 1210 | |
0c4e8581 SH |
1211 | err = -EINVAL; |
1212 | if (sock->type == SOCK_DGRAM && | |
bfd5f4a3 | 1213 | (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0) |
0c4e8581 | 1214 | goto out_free; |
1da177e4 LT |
1215 | |
1216 | /* Returns -EFAULT on error */ | |
bfd5f4a3 | 1217 | err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len); |
1da177e4 LT |
1218 | if (err) |
1219 | goto out_free; | |
2244d07b | 1220 | err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
ed85b565 RC |
1221 | if (err < 0) |
1222 | goto out_free; | |
1da177e4 LT |
1223 | |
1224 | skb->protocol = proto; | |
1225 | skb->dev = dev; | |
1226 | skb->priority = sk->sk_priority; | |
2d37a186 | 1227 | skb->mark = sk->sk_mark; |
1da177e4 | 1228 | |
bfd5f4a3 SS |
1229 | if (po->has_vnet_hdr) { |
1230 | if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
1231 | if (!skb_partial_csum_set(skb, vnet_hdr.csum_start, | |
1232 | vnet_hdr.csum_offset)) { | |
1233 | err = -EINVAL; | |
1234 | goto out_free; | |
1235 | } | |
1236 | } | |
1237 | ||
1238 | skb_shinfo(skb)->gso_size = vnet_hdr.gso_size; | |
1239 | skb_shinfo(skb)->gso_type = gso_type; | |
1240 | ||
1241 | /* Header must be checked, and gso_segs computed. */ | |
1242 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
1243 | skb_shinfo(skb)->gso_segs = 0; | |
1244 | ||
1245 | len += vnet_hdr_len; | |
1246 | } | |
1247 | ||
1da177e4 LT |
1248 | /* |
1249 | * Now send it | |
1250 | */ | |
1251 | ||
1252 | err = dev_queue_xmit(skb); | |
1253 | if (err > 0 && (err = net_xmit_errno(err)) != 0) | |
1254 | goto out_unlock; | |
1255 | ||
1256 | dev_put(dev); | |
1257 | ||
40d4e3df | 1258 | return len; |
1da177e4 LT |
1259 | |
1260 | out_free: | |
1261 | kfree_skb(skb); | |
1262 | out_unlock: | |
1263 | if (dev) | |
1264 | dev_put(dev); | |
1265 | out: | |
1266 | return err; | |
1267 | } | |
1268 | ||
69e3c75f JB |
1269 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
1270 | struct msghdr *msg, size_t len) | |
1271 | { | |
69e3c75f JB |
1272 | struct sock *sk = sock->sk; |
1273 | struct packet_sock *po = pkt_sk(sk); | |
1274 | if (po->tx_ring.pg_vec) | |
1275 | return tpacket_snd(po, msg); | |
1276 | else | |
69e3c75f JB |
1277 | return packet_snd(sock, msg, len); |
1278 | } | |
1279 | ||
1da177e4 LT |
1280 | /* |
1281 | * Close a PACKET socket. This is fairly simple. We immediately go | |
1282 | * to 'closed' state and remove our protocol entry in the device list. | |
1283 | */ | |
1284 | ||
1285 | static int packet_release(struct socket *sock) | |
1286 | { | |
1287 | struct sock *sk = sock->sk; | |
1288 | struct packet_sock *po; | |
d12d01d6 | 1289 | struct net *net; |
69e3c75f | 1290 | struct tpacket_req req; |
1da177e4 LT |
1291 | |
1292 | if (!sk) | |
1293 | return 0; | |
1294 | ||
3b1e0a65 | 1295 | net = sock_net(sk); |
1da177e4 LT |
1296 | po = pkt_sk(sk); |
1297 | ||
808f5114 | 1298 | spin_lock_bh(&net->packet.sklist_lock); |
1299 | sk_del_node_init_rcu(sk); | |
920de804 | 1300 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
808f5114 | 1301 | spin_unlock_bh(&net->packet.sklist_lock); |
1da177e4 | 1302 | |
808f5114 | 1303 | spin_lock(&po->bind_lock); |
1da177e4 LT |
1304 | if (po->running) { |
1305 | /* | |
808f5114 | 1306 | * Remove from protocol table |
1da177e4 | 1307 | */ |
1da177e4 LT |
1308 | po->running = 0; |
1309 | po->num = 0; | |
808f5114 | 1310 | __dev_remove_pack(&po->prot_hook); |
1da177e4 LT |
1311 | __sock_put(sk); |
1312 | } | |
808f5114 | 1313 | spin_unlock(&po->bind_lock); |
1da177e4 | 1314 | |
1da177e4 | 1315 | packet_flush_mclist(sk); |
1da177e4 | 1316 | |
69e3c75f JB |
1317 | memset(&req, 0, sizeof(req)); |
1318 | ||
1319 | if (po->rx_ring.pg_vec) | |
1320 | packet_set_ring(sk, &req, 1, 0); | |
1321 | ||
1322 | if (po->tx_ring.pg_vec) | |
1323 | packet_set_ring(sk, &req, 1, 1); | |
1da177e4 | 1324 | |
808f5114 | 1325 | synchronize_net(); |
1da177e4 LT |
1326 | /* |
1327 | * Now the socket is dead. No more input will appear. | |
1328 | */ | |
1da177e4 LT |
1329 | sock_orphan(sk); |
1330 | sock->sk = NULL; | |
1331 | ||
1332 | /* Purge queues */ | |
1333 | ||
1334 | skb_queue_purge(&sk->sk_receive_queue); | |
17ab56a2 | 1335 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
1336 | |
1337 | sock_put(sk); | |
1338 | return 0; | |
1339 | } | |
1340 | ||
1341 | /* | |
1342 | * Attach a packet hook. | |
1343 | */ | |
1344 | ||
0e11c91e | 1345 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
1da177e4 LT |
1346 | { |
1347 | struct packet_sock *po = pkt_sk(sk); | |
1348 | /* | |
1349 | * Detach an existing hook if present. | |
1350 | */ | |
1351 | ||
1352 | lock_sock(sk); | |
1353 | ||
1354 | spin_lock(&po->bind_lock); | |
1355 | if (po->running) { | |
1356 | __sock_put(sk); | |
1357 | po->running = 0; | |
1358 | po->num = 0; | |
1359 | spin_unlock(&po->bind_lock); | |
1360 | dev_remove_pack(&po->prot_hook); | |
1361 | spin_lock(&po->bind_lock); | |
1362 | } | |
1363 | ||
1364 | po->num = protocol; | |
1365 | po->prot_hook.type = protocol; | |
1366 | po->prot_hook.dev = dev; | |
1367 | ||
1368 | po->ifindex = dev ? dev->ifindex : 0; | |
1369 | ||
1370 | if (protocol == 0) | |
1371 | goto out_unlock; | |
1372 | ||
be85d4ad | 1373 | if (!dev || (dev->flags & IFF_UP)) { |
1da177e4 LT |
1374 | dev_add_pack(&po->prot_hook); |
1375 | sock_hold(sk); | |
1376 | po->running = 1; | |
be85d4ad UT |
1377 | } else { |
1378 | sk->sk_err = ENETDOWN; | |
1379 | if (!sock_flag(sk, SOCK_DEAD)) | |
1380 | sk->sk_error_report(sk); | |
1da177e4 LT |
1381 | } |
1382 | ||
1383 | out_unlock: | |
1384 | spin_unlock(&po->bind_lock); | |
1385 | release_sock(sk); | |
1386 | return 0; | |
1387 | } | |
1388 | ||
1389 | /* | |
1390 | * Bind a packet socket to a device | |
1391 | */ | |
1392 | ||
40d4e3df ED |
1393 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
1394 | int addr_len) | |
1da177e4 | 1395 | { |
40d4e3df | 1396 | struct sock *sk = sock->sk; |
1da177e4 LT |
1397 | char name[15]; |
1398 | struct net_device *dev; | |
1399 | int err = -ENODEV; | |
1ce4f28b | 1400 | |
1da177e4 LT |
1401 | /* |
1402 | * Check legality | |
1403 | */ | |
1ce4f28b | 1404 | |
8ae55f04 | 1405 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 | 1406 | return -EINVAL; |
40d4e3df | 1407 | strlcpy(name, uaddr->sa_data, sizeof(name)); |
1da177e4 | 1408 | |
3b1e0a65 | 1409 | dev = dev_get_by_name(sock_net(sk), name); |
1da177e4 LT |
1410 | if (dev) { |
1411 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); | |
1412 | dev_put(dev); | |
1413 | } | |
1414 | return err; | |
1415 | } | |
1da177e4 LT |
1416 | |
1417 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
1418 | { | |
40d4e3df ED |
1419 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
1420 | struct sock *sk = sock->sk; | |
1da177e4 LT |
1421 | struct net_device *dev = NULL; |
1422 | int err; | |
1423 | ||
1424 | ||
1425 | /* | |
1426 | * Check legality | |
1427 | */ | |
1ce4f28b | 1428 | |
1da177e4 LT |
1429 | if (addr_len < sizeof(struct sockaddr_ll)) |
1430 | return -EINVAL; | |
1431 | if (sll->sll_family != AF_PACKET) | |
1432 | return -EINVAL; | |
1433 | ||
1434 | if (sll->sll_ifindex) { | |
1435 | err = -ENODEV; | |
3b1e0a65 | 1436 | dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex); |
1da177e4 LT |
1437 | if (dev == NULL) |
1438 | goto out; | |
1439 | } | |
1440 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
1441 | if (dev) | |
1442 | dev_put(dev); | |
1443 | ||
1444 | out: | |
1445 | return err; | |
1446 | } | |
1447 | ||
1448 | static struct proto packet_proto = { | |
1449 | .name = "PACKET", | |
1450 | .owner = THIS_MODULE, | |
1451 | .obj_size = sizeof(struct packet_sock), | |
1452 | }; | |
1453 | ||
1454 | /* | |
1ce4f28b | 1455 | * Create a packet of type SOCK_PACKET. |
1da177e4 LT |
1456 | */ |
1457 | ||
3f378b68 EP |
1458 | static int packet_create(struct net *net, struct socket *sock, int protocol, |
1459 | int kern) | |
1da177e4 LT |
1460 | { |
1461 | struct sock *sk; | |
1462 | struct packet_sock *po; | |
0e11c91e | 1463 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1da177e4 LT |
1464 | int err; |
1465 | ||
1466 | if (!capable(CAP_NET_RAW)) | |
1467 | return -EPERM; | |
be02097c DM |
1468 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
1469 | sock->type != SOCK_PACKET) | |
1da177e4 LT |
1470 | return -ESOCKTNOSUPPORT; |
1471 | ||
1472 | sock->state = SS_UNCONNECTED; | |
1473 | ||
1474 | err = -ENOBUFS; | |
6257ff21 | 1475 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto); |
1da177e4 LT |
1476 | if (sk == NULL) |
1477 | goto out; | |
1478 | ||
1479 | sock->ops = &packet_ops; | |
1da177e4 LT |
1480 | if (sock->type == SOCK_PACKET) |
1481 | sock->ops = &packet_ops_spkt; | |
be02097c | 1482 | |
1da177e4 LT |
1483 | sock_init_data(sock, sk); |
1484 | ||
1485 | po = pkt_sk(sk); | |
1486 | sk->sk_family = PF_PACKET; | |
0e11c91e | 1487 | po->num = proto; |
1da177e4 LT |
1488 | |
1489 | sk->sk_destruct = packet_sock_destruct; | |
17ab56a2 | 1490 | sk_refcnt_debug_inc(sk); |
1da177e4 LT |
1491 | |
1492 | /* | |
1493 | * Attach a protocol block | |
1494 | */ | |
1495 | ||
1496 | spin_lock_init(&po->bind_lock); | |
905db440 | 1497 | mutex_init(&po->pg_vec_lock); |
1da177e4 | 1498 | po->prot_hook.func = packet_rcv; |
be02097c | 1499 | |
1da177e4 LT |
1500 | if (sock->type == SOCK_PACKET) |
1501 | po->prot_hook.func = packet_rcv_spkt; | |
be02097c | 1502 | |
1da177e4 LT |
1503 | po->prot_hook.af_packet_priv = sk; |
1504 | ||
0e11c91e AV |
1505 | if (proto) { |
1506 | po->prot_hook.type = proto; | |
1da177e4 LT |
1507 | dev_add_pack(&po->prot_hook); |
1508 | sock_hold(sk); | |
1509 | po->running = 1; | |
1510 | } | |
1511 | ||
808f5114 | 1512 | spin_lock_bh(&net->packet.sklist_lock); |
1513 | sk_add_node_rcu(sk, &net->packet.sklist); | |
3680453c | 1514 | sock_prot_inuse_add(net, &packet_proto, 1); |
808f5114 | 1515 | spin_unlock_bh(&net->packet.sklist_lock); |
1516 | ||
40d4e3df | 1517 | return 0; |
1da177e4 LT |
1518 | out: |
1519 | return err; | |
1520 | } | |
1521 | ||
ed85b565 RC |
1522 | static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len) |
1523 | { | |
1524 | struct sock_exterr_skb *serr; | |
1525 | struct sk_buff *skb, *skb2; | |
1526 | int copied, err; | |
1527 | ||
1528 | err = -EAGAIN; | |
1529 | skb = skb_dequeue(&sk->sk_error_queue); | |
1530 | if (skb == NULL) | |
1531 | goto out; | |
1532 | ||
1533 | copied = skb->len; | |
1534 | if (copied > len) { | |
1535 | msg->msg_flags |= MSG_TRUNC; | |
1536 | copied = len; | |
1537 | } | |
1538 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1539 | if (err) | |
1540 | goto out_free_skb; | |
1541 | ||
1542 | sock_recv_timestamp(msg, sk, skb); | |
1543 | ||
1544 | serr = SKB_EXT_ERR(skb); | |
1545 | put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP, | |
1546 | sizeof(serr->ee), &serr->ee); | |
1547 | ||
1548 | msg->msg_flags |= MSG_ERRQUEUE; | |
1549 | err = copied; | |
1550 | ||
1551 | /* Reset and regenerate socket error */ | |
1552 | spin_lock_bh(&sk->sk_error_queue.lock); | |
1553 | sk->sk_err = 0; | |
1554 | if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { | |
1555 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; | |
1556 | spin_unlock_bh(&sk->sk_error_queue.lock); | |
1557 | sk->sk_error_report(sk); | |
1558 | } else | |
1559 | spin_unlock_bh(&sk->sk_error_queue.lock); | |
1560 | ||
1561 | out_free_skb: | |
1562 | kfree_skb(skb); | |
1563 | out: | |
1564 | return err; | |
1565 | } | |
1566 | ||
1da177e4 LT |
1567 | /* |
1568 | * Pull a packet from our receive queue and hand it to the user. | |
1569 | * If necessary we block. | |
1570 | */ | |
1571 | ||
1572 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1573 | struct msghdr *msg, size_t len, int flags) | |
1574 | { | |
1575 | struct sock *sk = sock->sk; | |
1576 | struct sk_buff *skb; | |
1577 | int copied, err; | |
0fb375fb | 1578 | struct sockaddr_ll *sll; |
bfd5f4a3 | 1579 | int vnet_hdr_len = 0; |
1da177e4 LT |
1580 | |
1581 | err = -EINVAL; | |
ed85b565 | 1582 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE)) |
1da177e4 LT |
1583 | goto out; |
1584 | ||
1585 | #if 0 | |
1586 | /* What error should we return now? EUNATTACH? */ | |
1587 | if (pkt_sk(sk)->ifindex < 0) | |
1588 | return -ENODEV; | |
1589 | #endif | |
1590 | ||
ed85b565 RC |
1591 | if (flags & MSG_ERRQUEUE) { |
1592 | err = packet_recv_error(sk, msg, len); | |
1593 | goto out; | |
1594 | } | |
1595 | ||
1da177e4 LT |
1596 | /* |
1597 | * Call the generic datagram receiver. This handles all sorts | |
1598 | * of horrible races and re-entrancy so we can forget about it | |
1599 | * in the protocol layers. | |
1600 | * | |
1601 | * Now it will return ENETDOWN, if device have just gone down, | |
1602 | * but then it will block. | |
1603 | */ | |
1604 | ||
40d4e3df | 1605 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
1da177e4 LT |
1606 | |
1607 | /* | |
1ce4f28b | 1608 | * An error occurred so return it. Because skb_recv_datagram() |
1da177e4 LT |
1609 | * handles the blocking we don't see and worry about blocking |
1610 | * retries. | |
1611 | */ | |
1612 | ||
8ae55f04 | 1613 | if (skb == NULL) |
1da177e4 LT |
1614 | goto out; |
1615 | ||
bfd5f4a3 SS |
1616 | if (pkt_sk(sk)->has_vnet_hdr) { |
1617 | struct virtio_net_hdr vnet_hdr = { 0 }; | |
1618 | ||
1619 | err = -EINVAL; | |
1620 | vnet_hdr_len = sizeof(vnet_hdr); | |
1f18b717 | 1621 | if (len < vnet_hdr_len) |
bfd5f4a3 SS |
1622 | goto out_free; |
1623 | ||
1f18b717 MK |
1624 | len -= vnet_hdr_len; |
1625 | ||
bfd5f4a3 SS |
1626 | if (skb_is_gso(skb)) { |
1627 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
1628 | ||
1629 | /* This is a hint as to how much should be linear. */ | |
1630 | vnet_hdr.hdr_len = skb_headlen(skb); | |
1631 | vnet_hdr.gso_size = sinfo->gso_size; | |
1632 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
1633 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
1634 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
1635 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
1636 | else if (sinfo->gso_type & SKB_GSO_UDP) | |
1637 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
1638 | else if (sinfo->gso_type & SKB_GSO_FCOE) | |
1639 | goto out_free; | |
1640 | else | |
1641 | BUG(); | |
1642 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
1643 | vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
1644 | } else | |
1645 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
1646 | ||
1647 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
1648 | vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
1649 | vnet_hdr.csum_start = skb->csum_start - | |
1650 | skb_headroom(skb); | |
1651 | vnet_hdr.csum_offset = skb->csum_offset; | |
1652 | } /* else everything is zero */ | |
1653 | ||
1654 | err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr, | |
1655 | vnet_hdr_len); | |
1656 | if (err < 0) | |
1657 | goto out_free; | |
1658 | } | |
1659 | ||
0fb375fb EB |
1660 | /* |
1661 | * If the address length field is there to be filled in, we fill | |
1662 | * it in now. | |
1663 | */ | |
1664 | ||
ffbc6111 | 1665 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
0fb375fb EB |
1666 | if (sock->type == SOCK_PACKET) |
1667 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
1668 | else | |
1669 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); | |
1670 | ||
1da177e4 LT |
1671 | /* |
1672 | * You lose any data beyond the buffer you gave. If it worries a | |
1673 | * user program they can ask the device for its MTU anyway. | |
1674 | */ | |
1675 | ||
1676 | copied = skb->len; | |
40d4e3df ED |
1677 | if (copied > len) { |
1678 | copied = len; | |
1679 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 LT |
1680 | } |
1681 | ||
1682 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1683 | if (err) | |
1684 | goto out_free; | |
1685 | ||
3b885787 | 1686 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
1687 | |
1688 | if (msg->msg_name) | |
ffbc6111 HX |
1689 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
1690 | msg->msg_namelen); | |
1da177e4 | 1691 | |
8dc41944 | 1692 | if (pkt_sk(sk)->auxdata) { |
ffbc6111 HX |
1693 | struct tpacket_auxdata aux; |
1694 | ||
1695 | aux.tp_status = TP_STATUS_USER; | |
1696 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
1697 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; | |
1698 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; | |
1699 | aux.tp_snaplen = skb->len; | |
1700 | aux.tp_mac = 0; | |
bbe735e4 | 1701 | aux.tp_net = skb_network_offset(skb); |
05423b24 | 1702 | aux.tp_vlan_tci = vlan_tx_tag_get(skb); |
ffbc6111 HX |
1703 | |
1704 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); | |
8dc41944 HX |
1705 | } |
1706 | ||
1da177e4 LT |
1707 | /* |
1708 | * Free or return the buffer as appropriate. Again this | |
1709 | * hides all the races and re-entrancy issues from us. | |
1710 | */ | |
bfd5f4a3 | 1711 | err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied); |
1da177e4 LT |
1712 | |
1713 | out_free: | |
1714 | skb_free_datagram(sk, skb); | |
1715 | out: | |
1716 | return err; | |
1717 | } | |
1718 | ||
1da177e4 LT |
1719 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
1720 | int *uaddr_len, int peer) | |
1721 | { | |
1722 | struct net_device *dev; | |
1723 | struct sock *sk = sock->sk; | |
1724 | ||
1725 | if (peer) | |
1726 | return -EOPNOTSUPP; | |
1727 | ||
1728 | uaddr->sa_family = AF_PACKET; | |
654d1f8a ED |
1729 | rcu_read_lock(); |
1730 | dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); | |
1731 | if (dev) | |
67286640 | 1732 | strncpy(uaddr->sa_data, dev->name, 14); |
654d1f8a | 1733 | else |
1da177e4 | 1734 | memset(uaddr->sa_data, 0, 14); |
654d1f8a | 1735 | rcu_read_unlock(); |
1da177e4 LT |
1736 | *uaddr_len = sizeof(*uaddr); |
1737 | ||
1738 | return 0; | |
1739 | } | |
1da177e4 LT |
1740 | |
1741 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
1742 | int *uaddr_len, int peer) | |
1743 | { | |
1744 | struct net_device *dev; | |
1745 | struct sock *sk = sock->sk; | |
1746 | struct packet_sock *po = pkt_sk(sk); | |
13cfa97b | 1747 | DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr); |
1da177e4 LT |
1748 | |
1749 | if (peer) | |
1750 | return -EOPNOTSUPP; | |
1751 | ||
1752 | sll->sll_family = AF_PACKET; | |
1753 | sll->sll_ifindex = po->ifindex; | |
1754 | sll->sll_protocol = po->num; | |
67286640 | 1755 | sll->sll_pkttype = 0; |
654d1f8a ED |
1756 | rcu_read_lock(); |
1757 | dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex); | |
1da177e4 LT |
1758 | if (dev) { |
1759 | sll->sll_hatype = dev->type; | |
1760 | sll->sll_halen = dev->addr_len; | |
1761 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1da177e4 LT |
1762 | } else { |
1763 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
1764 | sll->sll_halen = 0; | |
1765 | } | |
654d1f8a | 1766 | rcu_read_unlock(); |
0fb375fb | 1767 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
1768 | |
1769 | return 0; | |
1770 | } | |
1771 | ||
2aeb0b88 WC |
1772 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
1773 | int what) | |
1da177e4 LT |
1774 | { |
1775 | switch (i->type) { | |
1776 | case PACKET_MR_MULTICAST: | |
1162563f JP |
1777 | if (i->alen != dev->addr_len) |
1778 | return -EINVAL; | |
1da177e4 | 1779 | if (what > 0) |
22bedad3 | 1780 | return dev_mc_add(dev, i->addr); |
1da177e4 | 1781 | else |
22bedad3 | 1782 | return dev_mc_del(dev, i->addr); |
1da177e4 LT |
1783 | break; |
1784 | case PACKET_MR_PROMISC: | |
2aeb0b88 | 1785 | return dev_set_promiscuity(dev, what); |
1da177e4 LT |
1786 | break; |
1787 | case PACKET_MR_ALLMULTI: | |
2aeb0b88 | 1788 | return dev_set_allmulti(dev, what); |
1da177e4 | 1789 | break; |
d95ed927 | 1790 | case PACKET_MR_UNICAST: |
1162563f JP |
1791 | if (i->alen != dev->addr_len) |
1792 | return -EINVAL; | |
d95ed927 | 1793 | if (what > 0) |
a748ee24 | 1794 | return dev_uc_add(dev, i->addr); |
d95ed927 | 1795 | else |
a748ee24 | 1796 | return dev_uc_del(dev, i->addr); |
d95ed927 | 1797 | break; |
40d4e3df ED |
1798 | default: |
1799 | break; | |
1da177e4 | 1800 | } |
2aeb0b88 | 1801 | return 0; |
1da177e4 LT |
1802 | } |
1803 | ||
1804 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
1805 | { | |
40d4e3df | 1806 | for ( ; i; i = i->next) { |
1da177e4 LT |
1807 | if (i->ifindex == dev->ifindex) |
1808 | packet_dev_mc(dev, i, what); | |
1809 | } | |
1810 | } | |
1811 | ||
0fb375fb | 1812 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1813 | { |
1814 | struct packet_sock *po = pkt_sk(sk); | |
1815 | struct packet_mclist *ml, *i; | |
1816 | struct net_device *dev; | |
1817 | int err; | |
1818 | ||
1819 | rtnl_lock(); | |
1820 | ||
1821 | err = -ENODEV; | |
3b1e0a65 | 1822 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
1da177e4 LT |
1823 | if (!dev) |
1824 | goto done; | |
1825 | ||
1826 | err = -EINVAL; | |
1162563f | 1827 | if (mreq->mr_alen > dev->addr_len) |
1da177e4 LT |
1828 | goto done; |
1829 | ||
1830 | err = -ENOBUFS; | |
8b3a7005 | 1831 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
1832 | if (i == NULL) |
1833 | goto done; | |
1834 | ||
1835 | err = 0; | |
1836 | for (ml = po->mclist; ml; ml = ml->next) { | |
1837 | if (ml->ifindex == mreq->mr_ifindex && | |
1838 | ml->type == mreq->mr_type && | |
1839 | ml->alen == mreq->mr_alen && | |
1840 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1841 | ml->count++; | |
1842 | /* Free the new element ... */ | |
1843 | kfree(i); | |
1844 | goto done; | |
1845 | } | |
1846 | } | |
1847 | ||
1848 | i->type = mreq->mr_type; | |
1849 | i->ifindex = mreq->mr_ifindex; | |
1850 | i->alen = mreq->mr_alen; | |
1851 | memcpy(i->addr, mreq->mr_address, i->alen); | |
1852 | i->count = 1; | |
1853 | i->next = po->mclist; | |
1854 | po->mclist = i; | |
2aeb0b88 WC |
1855 | err = packet_dev_mc(dev, i, 1); |
1856 | if (err) { | |
1857 | po->mclist = i->next; | |
1858 | kfree(i); | |
1859 | } | |
1da177e4 LT |
1860 | |
1861 | done: | |
1862 | rtnl_unlock(); | |
1863 | return err; | |
1864 | } | |
1865 | ||
0fb375fb | 1866 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1867 | { |
1868 | struct packet_mclist *ml, **mlp; | |
1869 | ||
1870 | rtnl_lock(); | |
1871 | ||
1872 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
1873 | if (ml->ifindex == mreq->mr_ifindex && | |
1874 | ml->type == mreq->mr_type && | |
1875 | ml->alen == mreq->mr_alen && | |
1876 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1877 | if (--ml->count == 0) { | |
1878 | struct net_device *dev; | |
1879 | *mlp = ml->next; | |
ad959e76 ED |
1880 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1881 | if (dev) | |
1da177e4 | 1882 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
1883 | kfree(ml); |
1884 | } | |
1885 | rtnl_unlock(); | |
1886 | return 0; | |
1887 | } | |
1888 | } | |
1889 | rtnl_unlock(); | |
1890 | return -EADDRNOTAVAIL; | |
1891 | } | |
1892 | ||
1893 | static void packet_flush_mclist(struct sock *sk) | |
1894 | { | |
1895 | struct packet_sock *po = pkt_sk(sk); | |
1896 | struct packet_mclist *ml; | |
1897 | ||
1898 | if (!po->mclist) | |
1899 | return; | |
1900 | ||
1901 | rtnl_lock(); | |
1902 | while ((ml = po->mclist) != NULL) { | |
1903 | struct net_device *dev; | |
1904 | ||
1905 | po->mclist = ml->next; | |
ad959e76 ED |
1906 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1907 | if (dev != NULL) | |
1da177e4 | 1908 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
1909 | kfree(ml); |
1910 | } | |
1911 | rtnl_unlock(); | |
1912 | } | |
1da177e4 LT |
1913 | |
1914 | static int | |
b7058842 | 1915 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1916 | { |
1917 | struct sock *sk = sock->sk; | |
8dc41944 | 1918 | struct packet_sock *po = pkt_sk(sk); |
1da177e4 LT |
1919 | int ret; |
1920 | ||
1921 | if (level != SOL_PACKET) | |
1922 | return -ENOPROTOOPT; | |
1923 | ||
69e3c75f | 1924 | switch (optname) { |
1ce4f28b | 1925 | case PACKET_ADD_MEMBERSHIP: |
1da177e4 LT |
1926 | case PACKET_DROP_MEMBERSHIP: |
1927 | { | |
0fb375fb EB |
1928 | struct packet_mreq_max mreq; |
1929 | int len = optlen; | |
1930 | memset(&mreq, 0, sizeof(mreq)); | |
1931 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 1932 | return -EINVAL; |
0fb375fb EB |
1933 | if (len > sizeof(mreq)) |
1934 | len = sizeof(mreq); | |
40d4e3df | 1935 | if (copy_from_user(&mreq, optval, len)) |
1da177e4 | 1936 | return -EFAULT; |
0fb375fb EB |
1937 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
1938 | return -EINVAL; | |
1da177e4 LT |
1939 | if (optname == PACKET_ADD_MEMBERSHIP) |
1940 | ret = packet_mc_add(sk, &mreq); | |
1941 | else | |
1942 | ret = packet_mc_drop(sk, &mreq); | |
1943 | return ret; | |
1944 | } | |
a2efcfa0 | 1945 | |
1da177e4 | 1946 | case PACKET_RX_RING: |
69e3c75f | 1947 | case PACKET_TX_RING: |
1da177e4 LT |
1948 | { |
1949 | struct tpacket_req req; | |
1950 | ||
40d4e3df | 1951 | if (optlen < sizeof(req)) |
1da177e4 | 1952 | return -EINVAL; |
bfd5f4a3 SS |
1953 | if (pkt_sk(sk)->has_vnet_hdr) |
1954 | return -EINVAL; | |
40d4e3df | 1955 | if (copy_from_user(&req, optval, sizeof(req))) |
1da177e4 | 1956 | return -EFAULT; |
69e3c75f | 1957 | return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING); |
1da177e4 LT |
1958 | } |
1959 | case PACKET_COPY_THRESH: | |
1960 | { | |
1961 | int val; | |
1962 | ||
40d4e3df | 1963 | if (optlen != sizeof(val)) |
1da177e4 | 1964 | return -EINVAL; |
40d4e3df | 1965 | if (copy_from_user(&val, optval, sizeof(val))) |
1da177e4 LT |
1966 | return -EFAULT; |
1967 | ||
1968 | pkt_sk(sk)->copy_thresh = val; | |
1969 | return 0; | |
1970 | } | |
bbd6ef87 PM |
1971 | case PACKET_VERSION: |
1972 | { | |
1973 | int val; | |
1974 | ||
1975 | if (optlen != sizeof(val)) | |
1976 | return -EINVAL; | |
69e3c75f | 1977 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
bbd6ef87 PM |
1978 | return -EBUSY; |
1979 | if (copy_from_user(&val, optval, sizeof(val))) | |
1980 | return -EFAULT; | |
1981 | switch (val) { | |
1982 | case TPACKET_V1: | |
1983 | case TPACKET_V2: | |
1984 | po->tp_version = val; | |
1985 | return 0; | |
1986 | default: | |
1987 | return -EINVAL; | |
1988 | } | |
1989 | } | |
8913336a PM |
1990 | case PACKET_RESERVE: |
1991 | { | |
1992 | unsigned int val; | |
1993 | ||
1994 | if (optlen != sizeof(val)) | |
1995 | return -EINVAL; | |
69e3c75f | 1996 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
8913336a PM |
1997 | return -EBUSY; |
1998 | if (copy_from_user(&val, optval, sizeof(val))) | |
1999 | return -EFAULT; | |
2000 | po->tp_reserve = val; | |
2001 | return 0; | |
2002 | } | |
69e3c75f JB |
2003 | case PACKET_LOSS: |
2004 | { | |
2005 | unsigned int val; | |
2006 | ||
2007 | if (optlen != sizeof(val)) | |
2008 | return -EINVAL; | |
2009 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
2010 | return -EBUSY; | |
2011 | if (copy_from_user(&val, optval, sizeof(val))) | |
2012 | return -EFAULT; | |
2013 | po->tp_loss = !!val; | |
2014 | return 0; | |
2015 | } | |
8dc41944 HX |
2016 | case PACKET_AUXDATA: |
2017 | { | |
2018 | int val; | |
2019 | ||
2020 | if (optlen < sizeof(val)) | |
2021 | return -EINVAL; | |
2022 | if (copy_from_user(&val, optval, sizeof(val))) | |
2023 | return -EFAULT; | |
2024 | ||
2025 | po->auxdata = !!val; | |
2026 | return 0; | |
2027 | } | |
80feaacb PWJ |
2028 | case PACKET_ORIGDEV: |
2029 | { | |
2030 | int val; | |
2031 | ||
2032 | if (optlen < sizeof(val)) | |
2033 | return -EINVAL; | |
2034 | if (copy_from_user(&val, optval, sizeof(val))) | |
2035 | return -EFAULT; | |
2036 | ||
2037 | po->origdev = !!val; | |
2038 | return 0; | |
2039 | } | |
bfd5f4a3 SS |
2040 | case PACKET_VNET_HDR: |
2041 | { | |
2042 | int val; | |
2043 | ||
2044 | if (sock->type != SOCK_RAW) | |
2045 | return -EINVAL; | |
2046 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
2047 | return -EBUSY; | |
2048 | if (optlen < sizeof(val)) | |
2049 | return -EINVAL; | |
2050 | if (copy_from_user(&val, optval, sizeof(val))) | |
2051 | return -EFAULT; | |
2052 | ||
2053 | po->has_vnet_hdr = !!val; | |
2054 | return 0; | |
2055 | } | |
614f60fa SM |
2056 | case PACKET_TIMESTAMP: |
2057 | { | |
2058 | int val; | |
2059 | ||
2060 | if (optlen != sizeof(val)) | |
2061 | return -EINVAL; | |
2062 | if (copy_from_user(&val, optval, sizeof(val))) | |
2063 | return -EFAULT; | |
2064 | ||
2065 | po->tp_tstamp = val; | |
2066 | return 0; | |
2067 | } | |
1da177e4 LT |
2068 | default: |
2069 | return -ENOPROTOOPT; | |
2070 | } | |
2071 | } | |
2072 | ||
2073 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
2074 | char __user *optval, int __user *optlen) | |
2075 | { | |
2076 | int len; | |
8dc41944 | 2077 | int val; |
1da177e4 LT |
2078 | struct sock *sk = sock->sk; |
2079 | struct packet_sock *po = pkt_sk(sk); | |
8dc41944 HX |
2080 | void *data; |
2081 | struct tpacket_stats st; | |
1da177e4 LT |
2082 | |
2083 | if (level != SOL_PACKET) | |
2084 | return -ENOPROTOOPT; | |
2085 | ||
8ae55f04 KK |
2086 | if (get_user(len, optlen)) |
2087 | return -EFAULT; | |
1da177e4 LT |
2088 | |
2089 | if (len < 0) | |
2090 | return -EINVAL; | |
1ce4f28b | 2091 | |
69e3c75f | 2092 | switch (optname) { |
1da177e4 | 2093 | case PACKET_STATISTICS: |
1da177e4 LT |
2094 | if (len > sizeof(struct tpacket_stats)) |
2095 | len = sizeof(struct tpacket_stats); | |
2096 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
2097 | st = po->stats; | |
2098 | memset(&po->stats, 0, sizeof(st)); | |
2099 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
2100 | st.tp_packets += st.tp_drops; | |
2101 | ||
8dc41944 HX |
2102 | data = &st; |
2103 | break; | |
2104 | case PACKET_AUXDATA: | |
2105 | if (len > sizeof(int)) | |
2106 | len = sizeof(int); | |
2107 | val = po->auxdata; | |
2108 | ||
80feaacb PWJ |
2109 | data = &val; |
2110 | break; | |
2111 | case PACKET_ORIGDEV: | |
2112 | if (len > sizeof(int)) | |
2113 | len = sizeof(int); | |
2114 | val = po->origdev; | |
2115 | ||
bfd5f4a3 SS |
2116 | data = &val; |
2117 | break; | |
2118 | case PACKET_VNET_HDR: | |
2119 | if (len > sizeof(int)) | |
2120 | len = sizeof(int); | |
2121 | val = po->has_vnet_hdr; | |
2122 | ||
8dc41944 | 2123 | data = &val; |
1da177e4 | 2124 | break; |
bbd6ef87 PM |
2125 | case PACKET_VERSION: |
2126 | if (len > sizeof(int)) | |
2127 | len = sizeof(int); | |
2128 | val = po->tp_version; | |
2129 | data = &val; | |
2130 | break; | |
2131 | case PACKET_HDRLEN: | |
2132 | if (len > sizeof(int)) | |
2133 | len = sizeof(int); | |
2134 | if (copy_from_user(&val, optval, len)) | |
2135 | return -EFAULT; | |
2136 | switch (val) { | |
2137 | case TPACKET_V1: | |
2138 | val = sizeof(struct tpacket_hdr); | |
2139 | break; | |
2140 | case TPACKET_V2: | |
2141 | val = sizeof(struct tpacket2_hdr); | |
2142 | break; | |
2143 | default: | |
2144 | return -EINVAL; | |
2145 | } | |
2146 | data = &val; | |
2147 | break; | |
8913336a PM |
2148 | case PACKET_RESERVE: |
2149 | if (len > sizeof(unsigned int)) | |
2150 | len = sizeof(unsigned int); | |
2151 | val = po->tp_reserve; | |
2152 | data = &val; | |
2153 | break; | |
69e3c75f JB |
2154 | case PACKET_LOSS: |
2155 | if (len > sizeof(unsigned int)) | |
2156 | len = sizeof(unsigned int); | |
2157 | val = po->tp_loss; | |
2158 | data = &val; | |
2159 | break; | |
614f60fa SM |
2160 | case PACKET_TIMESTAMP: |
2161 | if (len > sizeof(int)) | |
2162 | len = sizeof(int); | |
2163 | val = po->tp_tstamp; | |
2164 | data = &val; | |
2165 | break; | |
1da177e4 LT |
2166 | default: |
2167 | return -ENOPROTOOPT; | |
2168 | } | |
2169 | ||
8ae55f04 KK |
2170 | if (put_user(len, optlen)) |
2171 | return -EFAULT; | |
8dc41944 HX |
2172 | if (copy_to_user(optval, data, len)) |
2173 | return -EFAULT; | |
8ae55f04 | 2174 | return 0; |
1da177e4 LT |
2175 | } |
2176 | ||
2177 | ||
2178 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) | |
2179 | { | |
2180 | struct sock *sk; | |
2181 | struct hlist_node *node; | |
ad930650 | 2182 | struct net_device *dev = data; |
c346dca1 | 2183 | struct net *net = dev_net(dev); |
1da177e4 | 2184 | |
808f5114 | 2185 | rcu_read_lock(); |
2186 | sk_for_each_rcu(sk, node, &net->packet.sklist) { | |
1da177e4 LT |
2187 | struct packet_sock *po = pkt_sk(sk); |
2188 | ||
2189 | switch (msg) { | |
2190 | case NETDEV_UNREGISTER: | |
1da177e4 LT |
2191 | if (po->mclist) |
2192 | packet_dev_mclist(dev, po->mclist, -1); | |
a2efcfa0 DM |
2193 | /* fallthrough */ |
2194 | ||
1da177e4 LT |
2195 | case NETDEV_DOWN: |
2196 | if (dev->ifindex == po->ifindex) { | |
2197 | spin_lock(&po->bind_lock); | |
2198 | if (po->running) { | |
2199 | __dev_remove_pack(&po->prot_hook); | |
2200 | __sock_put(sk); | |
2201 | po->running = 0; | |
2202 | sk->sk_err = ENETDOWN; | |
2203 | if (!sock_flag(sk, SOCK_DEAD)) | |
2204 | sk->sk_error_report(sk); | |
2205 | } | |
2206 | if (msg == NETDEV_UNREGISTER) { | |
2207 | po->ifindex = -1; | |
2208 | po->prot_hook.dev = NULL; | |
2209 | } | |
2210 | spin_unlock(&po->bind_lock); | |
2211 | } | |
2212 | break; | |
2213 | case NETDEV_UP: | |
808f5114 | 2214 | if (dev->ifindex == po->ifindex) { |
2215 | spin_lock(&po->bind_lock); | |
2216 | if (po->num && !po->running) { | |
2217 | dev_add_pack(&po->prot_hook); | |
2218 | sock_hold(sk); | |
2219 | po->running = 1; | |
2220 | } | |
2221 | spin_unlock(&po->bind_lock); | |
1da177e4 | 2222 | } |
1da177e4 LT |
2223 | break; |
2224 | } | |
2225 | } | |
808f5114 | 2226 | rcu_read_unlock(); |
1da177e4 LT |
2227 | return NOTIFY_DONE; |
2228 | } | |
2229 | ||
2230 | ||
2231 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
2232 | unsigned long arg) | |
2233 | { | |
2234 | struct sock *sk = sock->sk; | |
2235 | ||
69e3c75f | 2236 | switch (cmd) { |
40d4e3df ED |
2237 | case SIOCOUTQ: |
2238 | { | |
2239 | int amount = sk_wmem_alloc_get(sk); | |
31e6d363 | 2240 | |
40d4e3df ED |
2241 | return put_user(amount, (int __user *)arg); |
2242 | } | |
2243 | case SIOCINQ: | |
2244 | { | |
2245 | struct sk_buff *skb; | |
2246 | int amount = 0; | |
2247 | ||
2248 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
2249 | skb = skb_peek(&sk->sk_receive_queue); | |
2250 | if (skb) | |
2251 | amount = skb->len; | |
2252 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
2253 | return put_user(amount, (int __user *)arg); | |
2254 | } | |
2255 | case SIOCGSTAMP: | |
2256 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
2257 | case SIOCGSTAMPNS: | |
2258 | return sock_get_timestampns(sk, (struct timespec __user *)arg); | |
1ce4f28b | 2259 | |
1da177e4 | 2260 | #ifdef CONFIG_INET |
40d4e3df ED |
2261 | case SIOCADDRT: |
2262 | case SIOCDELRT: | |
2263 | case SIOCDARP: | |
2264 | case SIOCGARP: | |
2265 | case SIOCSARP: | |
2266 | case SIOCGIFADDR: | |
2267 | case SIOCSIFADDR: | |
2268 | case SIOCGIFBRDADDR: | |
2269 | case SIOCSIFBRDADDR: | |
2270 | case SIOCGIFNETMASK: | |
2271 | case SIOCSIFNETMASK: | |
2272 | case SIOCGIFDSTADDR: | |
2273 | case SIOCSIFDSTADDR: | |
2274 | case SIOCSIFFLAGS: | |
40d4e3df | 2275 | return inet_dgram_ops.ioctl(sock, cmd, arg); |
1da177e4 LT |
2276 | #endif |
2277 | ||
40d4e3df ED |
2278 | default: |
2279 | return -ENOIOCTLCMD; | |
1da177e4 LT |
2280 | } |
2281 | return 0; | |
2282 | } | |
2283 | ||
40d4e3df | 2284 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
1da177e4 LT |
2285 | poll_table *wait) |
2286 | { | |
2287 | struct sock *sk = sock->sk; | |
2288 | struct packet_sock *po = pkt_sk(sk); | |
2289 | unsigned int mask = datagram_poll(file, sock, wait); | |
2290 | ||
2291 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2292 | if (po->rx_ring.pg_vec) { |
2293 | if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL)) | |
1da177e4 LT |
2294 | mask |= POLLIN | POLLRDNORM; |
2295 | } | |
2296 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2297 | spin_lock_bh(&sk->sk_write_queue.lock); |
2298 | if (po->tx_ring.pg_vec) { | |
2299 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) | |
2300 | mask |= POLLOUT | POLLWRNORM; | |
2301 | } | |
2302 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
1da177e4 LT |
2303 | return mask; |
2304 | } | |
2305 | ||
2306 | ||
2307 | /* Dirty? Well, I still did not learn better way to account | |
2308 | * for user mmaps. | |
2309 | */ | |
2310 | ||
2311 | static void packet_mm_open(struct vm_area_struct *vma) | |
2312 | { | |
2313 | struct file *file = vma->vm_file; | |
40d4e3df | 2314 | struct socket *sock = file->private_data; |
1da177e4 | 2315 | struct sock *sk = sock->sk; |
1ce4f28b | 2316 | |
1da177e4 LT |
2317 | if (sk) |
2318 | atomic_inc(&pkt_sk(sk)->mapped); | |
2319 | } | |
2320 | ||
2321 | static void packet_mm_close(struct vm_area_struct *vma) | |
2322 | { | |
2323 | struct file *file = vma->vm_file; | |
40d4e3df | 2324 | struct socket *sock = file->private_data; |
1da177e4 | 2325 | struct sock *sk = sock->sk; |
1ce4f28b | 2326 | |
1da177e4 LT |
2327 | if (sk) |
2328 | atomic_dec(&pkt_sk(sk)->mapped); | |
2329 | } | |
2330 | ||
f0f37e2f | 2331 | static const struct vm_operations_struct packet_mmap_ops = { |
40d4e3df ED |
2332 | .open = packet_mm_open, |
2333 | .close = packet_mm_close, | |
1da177e4 LT |
2334 | }; |
2335 | ||
0e3125c7 NH |
2336 | static void free_pg_vec(struct pgv *pg_vec, unsigned int order, |
2337 | unsigned int len) | |
1da177e4 LT |
2338 | { |
2339 | int i; | |
2340 | ||
4ebf0ae2 | 2341 | for (i = 0; i < len; i++) { |
0e3125c7 NH |
2342 | if (likely(pg_vec[i].buffer)) { |
2343 | if (pg_vec[i].flags & PGV_FROM_VMALLOC) | |
2344 | vfree(pg_vec[i].buffer); | |
2345 | else | |
2346 | free_pages((unsigned long)pg_vec[i].buffer, | |
2347 | order); | |
2348 | pg_vec[i].buffer = NULL; | |
2349 | } | |
1da177e4 LT |
2350 | } |
2351 | kfree(pg_vec); | |
2352 | } | |
2353 | ||
0e3125c7 NH |
2354 | static inline char *alloc_one_pg_vec_page(unsigned long order, |
2355 | unsigned char *flags) | |
4ebf0ae2 | 2356 | { |
0e3125c7 NH |
2357 | char *buffer = NULL; |
2358 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | | |
2359 | __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY; | |
2360 | ||
2361 | buffer = (char *) __get_free_pages(gfp_flags, order); | |
2362 | ||
2363 | if (buffer) | |
2364 | return buffer; | |
2365 | ||
2366 | /* | |
2367 | * __get_free_pages failed, fall back to vmalloc | |
2368 | */ | |
2369 | *flags |= PGV_FROM_VMALLOC; | |
2370 | buffer = vmalloc((1 << order) * PAGE_SIZE); | |
719bfeaa | 2371 | |
0e3125c7 NH |
2372 | if (buffer) |
2373 | return buffer; | |
2374 | ||
2375 | /* | |
2376 | * vmalloc failed, lets dig into swap here | |
2377 | */ | |
2378 | *flags = 0; | |
2379 | gfp_flags &= ~__GFP_NORETRY; | |
2380 | buffer = (char *)__get_free_pages(gfp_flags, order); | |
2381 | if (buffer) | |
2382 | return buffer; | |
2383 | ||
2384 | /* | |
2385 | * complete and utter failure | |
2386 | */ | |
2387 | return NULL; | |
4ebf0ae2 DM |
2388 | } |
2389 | ||
0e3125c7 | 2390 | static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order) |
4ebf0ae2 DM |
2391 | { |
2392 | unsigned int block_nr = req->tp_block_nr; | |
0e3125c7 | 2393 | struct pgv *pg_vec; |
4ebf0ae2 DM |
2394 | int i; |
2395 | ||
0e3125c7 | 2396 | pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL); |
4ebf0ae2 DM |
2397 | if (unlikely(!pg_vec)) |
2398 | goto out; | |
2399 | ||
2400 | for (i = 0; i < block_nr; i++) { | |
0e3125c7 NH |
2401 | pg_vec[i].buffer = alloc_one_pg_vec_page(order, |
2402 | &pg_vec[i].flags); | |
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); | |
0e3125c7 | 2412 | kfree(pg_vec); |
4ebf0ae2 DM |
2413 | pg_vec = NULL; |
2414 | goto out; | |
2415 | } | |
1da177e4 | 2416 | |
69e3c75f JB |
2417 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
2418 | int closing, int tx_ring) | |
1da177e4 | 2419 | { |
0e3125c7 | 2420 | struct pgv *pg_vec = NULL; |
1da177e4 | 2421 | struct packet_sock *po = pkt_sk(sk); |
0e11c91e | 2422 | int was_running, order = 0; |
69e3c75f JB |
2423 | struct packet_ring_buffer *rb; |
2424 | struct sk_buff_head *rb_queue; | |
0e11c91e | 2425 | __be16 num; |
69e3c75f | 2426 | int err; |
1ce4f28b | 2427 | |
69e3c75f JB |
2428 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
2429 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; | |
1da177e4 | 2430 | |
69e3c75f JB |
2431 | err = -EBUSY; |
2432 | if (!closing) { | |
2433 | if (atomic_read(&po->mapped)) | |
2434 | goto out; | |
2435 | if (atomic_read(&rb->pending)) | |
2436 | goto out; | |
2437 | } | |
1da177e4 | 2438 | |
69e3c75f JB |
2439 | if (req->tp_block_nr) { |
2440 | /* Sanity tests and some calculations */ | |
2441 | err = -EBUSY; | |
2442 | if (unlikely(rb->pg_vec)) | |
2443 | goto out; | |
1da177e4 | 2444 | |
bbd6ef87 PM |
2445 | switch (po->tp_version) { |
2446 | case TPACKET_V1: | |
2447 | po->tp_hdrlen = TPACKET_HDRLEN; | |
2448 | break; | |
2449 | case TPACKET_V2: | |
2450 | po->tp_hdrlen = TPACKET2_HDRLEN; | |
2451 | break; | |
2452 | } | |
2453 | ||
69e3c75f | 2454 | err = -EINVAL; |
4ebf0ae2 | 2455 | if (unlikely((int)req->tp_block_size <= 0)) |
69e3c75f | 2456 | goto out; |
4ebf0ae2 | 2457 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
69e3c75f | 2458 | goto out; |
8913336a | 2459 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
69e3c75f JB |
2460 | po->tp_reserve)) |
2461 | goto out; | |
4ebf0ae2 | 2462 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
69e3c75f | 2463 | goto out; |
1da177e4 | 2464 | |
69e3c75f JB |
2465 | rb->frames_per_block = req->tp_block_size/req->tp_frame_size; |
2466 | if (unlikely(rb->frames_per_block <= 0)) | |
2467 | goto out; | |
2468 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != | |
2469 | req->tp_frame_nr)) | |
2470 | goto out; | |
1da177e4 LT |
2471 | |
2472 | err = -ENOMEM; | |
4ebf0ae2 DM |
2473 | order = get_order(req->tp_block_size); |
2474 | pg_vec = alloc_pg_vec(req, order); | |
2475 | if (unlikely(!pg_vec)) | |
1da177e4 | 2476 | goto out; |
69e3c75f JB |
2477 | } |
2478 | /* Done */ | |
2479 | else { | |
2480 | err = -EINVAL; | |
4ebf0ae2 | 2481 | if (unlikely(req->tp_frame_nr)) |
69e3c75f | 2482 | goto out; |
1da177e4 LT |
2483 | } |
2484 | ||
2485 | lock_sock(sk); | |
2486 | ||
2487 | /* Detach socket from network */ | |
2488 | spin_lock(&po->bind_lock); | |
2489 | was_running = po->running; | |
2490 | num = po->num; | |
2491 | if (was_running) { | |
2492 | __dev_remove_pack(&po->prot_hook); | |
2493 | po->num = 0; | |
2494 | po->running = 0; | |
2495 | __sock_put(sk); | |
2496 | } | |
2497 | spin_unlock(&po->bind_lock); | |
1ce4f28b | 2498 | |
1da177e4 LT |
2499 | synchronize_net(); |
2500 | ||
2501 | err = -EBUSY; | |
905db440 | 2502 | mutex_lock(&po->pg_vec_lock); |
1da177e4 LT |
2503 | if (closing || atomic_read(&po->mapped) == 0) { |
2504 | err = 0; | |
2505 | #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) | |
69e3c75f JB |
2506 | spin_lock_bh(&rb_queue->lock); |
2507 | pg_vec = XC(rb->pg_vec, pg_vec); | |
2508 | rb->frame_max = (req->tp_frame_nr - 1); | |
2509 | rb->head = 0; | |
2510 | rb->frame_size = req->tp_frame_size; | |
2511 | spin_unlock_bh(&rb_queue->lock); | |
2512 | ||
2513 | order = XC(rb->pg_vec_order, order); | |
2514 | req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr); | |
2515 | ||
2516 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
2517 | po->prot_hook.func = (po->rx_ring.pg_vec) ? | |
2518 | tpacket_rcv : packet_rcv; | |
2519 | skb_queue_purge(rb_queue); | |
1da177e4 LT |
2520 | #undef XC |
2521 | if (atomic_read(&po->mapped)) | |
40d4e3df ED |
2522 | pr_err("packet_mmap: vma is busy: %d\n", |
2523 | atomic_read(&po->mapped)); | |
1da177e4 | 2524 | } |
905db440 | 2525 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2526 | |
2527 | spin_lock(&po->bind_lock); | |
2528 | if (was_running && !po->running) { | |
2529 | sock_hold(sk); | |
2530 | po->running = 1; | |
2531 | po->num = num; | |
2532 | dev_add_pack(&po->prot_hook); | |
2533 | } | |
2534 | spin_unlock(&po->bind_lock); | |
2535 | ||
2536 | release_sock(sk); | |
2537 | ||
1da177e4 LT |
2538 | if (pg_vec) |
2539 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
2540 | out: | |
2541 | return err; | |
2542 | } | |
2543 | ||
69e3c75f JB |
2544 | static int packet_mmap(struct file *file, struct socket *sock, |
2545 | struct vm_area_struct *vma) | |
1da177e4 LT |
2546 | { |
2547 | struct sock *sk = sock->sk; | |
2548 | struct packet_sock *po = pkt_sk(sk); | |
69e3c75f JB |
2549 | unsigned long size, expected_size; |
2550 | struct packet_ring_buffer *rb; | |
1da177e4 LT |
2551 | unsigned long start; |
2552 | int err = -EINVAL; | |
2553 | int i; | |
2554 | ||
2555 | if (vma->vm_pgoff) | |
2556 | return -EINVAL; | |
2557 | ||
905db440 | 2558 | mutex_lock(&po->pg_vec_lock); |
69e3c75f JB |
2559 | |
2560 | expected_size = 0; | |
2561 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { | |
2562 | if (rb->pg_vec) { | |
2563 | expected_size += rb->pg_vec_len | |
2564 | * rb->pg_vec_pages | |
2565 | * PAGE_SIZE; | |
2566 | } | |
2567 | } | |
2568 | ||
2569 | if (expected_size == 0) | |
1da177e4 | 2570 | goto out; |
69e3c75f JB |
2571 | |
2572 | size = vma->vm_end - vma->vm_start; | |
2573 | if (size != expected_size) | |
1da177e4 LT |
2574 | goto out; |
2575 | ||
1da177e4 | 2576 | start = vma->vm_start; |
69e3c75f JB |
2577 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
2578 | if (rb->pg_vec == NULL) | |
2579 | continue; | |
2580 | ||
2581 | for (i = 0; i < rb->pg_vec_len; i++) { | |
0e3125c7 NH |
2582 | struct page *page; |
2583 | void *kaddr = rb->pg_vec[i].buffer; | |
69e3c75f JB |
2584 | int pg_num; |
2585 | ||
2586 | for (pg_num = 0; pg_num < rb->pg_vec_pages; | |
0e3125c7 NH |
2587 | pg_num++) { |
2588 | if (rb->pg_vec[i].flags & PGV_FROM_VMALLOC) | |
2589 | page = vmalloc_to_page(kaddr); | |
2590 | else | |
2591 | page = virt_to_page(kaddr); | |
2592 | ||
69e3c75f JB |
2593 | err = vm_insert_page(vma, start, page); |
2594 | if (unlikely(err)) | |
2595 | goto out; | |
2596 | start += PAGE_SIZE; | |
0e3125c7 | 2597 | kaddr += PAGE_SIZE; |
69e3c75f | 2598 | } |
4ebf0ae2 | 2599 | } |
1da177e4 | 2600 | } |
69e3c75f | 2601 | |
4ebf0ae2 | 2602 | atomic_inc(&po->mapped); |
1da177e4 LT |
2603 | vma->vm_ops = &packet_mmap_ops; |
2604 | err = 0; | |
2605 | ||
2606 | out: | |
905db440 | 2607 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2608 | return err; |
2609 | } | |
1da177e4 | 2610 | |
90ddc4f0 | 2611 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
2612 | .family = PF_PACKET, |
2613 | .owner = THIS_MODULE, | |
2614 | .release = packet_release, | |
2615 | .bind = packet_bind_spkt, | |
2616 | .connect = sock_no_connect, | |
2617 | .socketpair = sock_no_socketpair, | |
2618 | .accept = sock_no_accept, | |
2619 | .getname = packet_getname_spkt, | |
2620 | .poll = datagram_poll, | |
2621 | .ioctl = packet_ioctl, | |
2622 | .listen = sock_no_listen, | |
2623 | .shutdown = sock_no_shutdown, | |
2624 | .setsockopt = sock_no_setsockopt, | |
2625 | .getsockopt = sock_no_getsockopt, | |
2626 | .sendmsg = packet_sendmsg_spkt, | |
2627 | .recvmsg = packet_recvmsg, | |
2628 | .mmap = sock_no_mmap, | |
2629 | .sendpage = sock_no_sendpage, | |
2630 | }; | |
1da177e4 | 2631 | |
90ddc4f0 | 2632 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
2633 | .family = PF_PACKET, |
2634 | .owner = THIS_MODULE, | |
2635 | .release = packet_release, | |
2636 | .bind = packet_bind, | |
2637 | .connect = sock_no_connect, | |
2638 | .socketpair = sock_no_socketpair, | |
2639 | .accept = sock_no_accept, | |
1ce4f28b | 2640 | .getname = packet_getname, |
1da177e4 LT |
2641 | .poll = packet_poll, |
2642 | .ioctl = packet_ioctl, | |
2643 | .listen = sock_no_listen, | |
2644 | .shutdown = sock_no_shutdown, | |
2645 | .setsockopt = packet_setsockopt, | |
2646 | .getsockopt = packet_getsockopt, | |
2647 | .sendmsg = packet_sendmsg, | |
2648 | .recvmsg = packet_recvmsg, | |
2649 | .mmap = packet_mmap, | |
2650 | .sendpage = sock_no_sendpage, | |
2651 | }; | |
2652 | ||
ec1b4cf7 | 2653 | static const struct net_proto_family packet_family_ops = { |
1da177e4 LT |
2654 | .family = PF_PACKET, |
2655 | .create = packet_create, | |
2656 | .owner = THIS_MODULE, | |
2657 | }; | |
2658 | ||
2659 | static struct notifier_block packet_netdev_notifier = { | |
40d4e3df | 2660 | .notifier_call = packet_notifier, |
1da177e4 LT |
2661 | }; |
2662 | ||
2663 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
2664 | |
2665 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
808f5114 | 2666 | __acquires(RCU) |
1da177e4 | 2667 | { |
e372c414 | 2668 | struct net *net = seq_file_net(seq); |
808f5114 | 2669 | |
2670 | rcu_read_lock(); | |
2671 | return seq_hlist_start_head_rcu(&net->packet.sklist, *pos); | |
1da177e4 LT |
2672 | } |
2673 | ||
2674 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2675 | { | |
1bf40954 | 2676 | struct net *net = seq_file_net(seq); |
808f5114 | 2677 | return seq_hlist_next_rcu(v, &net->packet.sklist, pos); |
1da177e4 LT |
2678 | } |
2679 | ||
2680 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
808f5114 | 2681 | __releases(RCU) |
1da177e4 | 2682 | { |
808f5114 | 2683 | rcu_read_unlock(); |
1da177e4 LT |
2684 | } |
2685 | ||
1ce4f28b | 2686 | static int packet_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
2687 | { |
2688 | if (v == SEQ_START_TOKEN) | |
2689 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
2690 | else { | |
b7ceabd9 | 2691 | struct sock *s = sk_entry(v); |
1da177e4 LT |
2692 | const struct packet_sock *po = pkt_sk(s); |
2693 | ||
2694 | seq_printf(seq, | |
2695 | "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", | |
2696 | s, | |
2697 | atomic_read(&s->sk_refcnt), | |
2698 | s->sk_type, | |
2699 | ntohs(po->num), | |
2700 | po->ifindex, | |
2701 | po->running, | |
2702 | atomic_read(&s->sk_rmem_alloc), | |
2703 | sock_i_uid(s), | |
40d4e3df | 2704 | sock_i_ino(s)); |
1da177e4 LT |
2705 | } |
2706 | ||
2707 | return 0; | |
2708 | } | |
2709 | ||
56b3d975 | 2710 | static const struct seq_operations packet_seq_ops = { |
1da177e4 LT |
2711 | .start = packet_seq_start, |
2712 | .next = packet_seq_next, | |
2713 | .stop = packet_seq_stop, | |
2714 | .show = packet_seq_show, | |
2715 | }; | |
2716 | ||
2717 | static int packet_seq_open(struct inode *inode, struct file *file) | |
2718 | { | |
e372c414 DL |
2719 | return seq_open_net(inode, file, &packet_seq_ops, |
2720 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2721 | } |
2722 | ||
da7071d7 | 2723 | static const struct file_operations packet_seq_fops = { |
1da177e4 LT |
2724 | .owner = THIS_MODULE, |
2725 | .open = packet_seq_open, | |
2726 | .read = seq_read, | |
2727 | .llseek = seq_lseek, | |
e372c414 | 2728 | .release = seq_release_net, |
1da177e4 LT |
2729 | }; |
2730 | ||
2731 | #endif | |
2732 | ||
2c8c1e72 | 2733 | static int __net_init packet_net_init(struct net *net) |
d12d01d6 | 2734 | { |
808f5114 | 2735 | spin_lock_init(&net->packet.sklist_lock); |
2aaef4e4 | 2736 | INIT_HLIST_HEAD(&net->packet.sklist); |
d12d01d6 DL |
2737 | |
2738 | if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops)) | |
2739 | return -ENOMEM; | |
2740 | ||
2741 | return 0; | |
2742 | } | |
2743 | ||
2c8c1e72 | 2744 | static void __net_exit packet_net_exit(struct net *net) |
d12d01d6 DL |
2745 | { |
2746 | proc_net_remove(net, "packet"); | |
2747 | } | |
2748 | ||
2749 | static struct pernet_operations packet_net_ops = { | |
2750 | .init = packet_net_init, | |
2751 | .exit = packet_net_exit, | |
2752 | }; | |
2753 | ||
2754 | ||
1da177e4 LT |
2755 | static void __exit packet_exit(void) |
2756 | { | |
1da177e4 | 2757 | unregister_netdevice_notifier(&packet_netdev_notifier); |
d12d01d6 | 2758 | unregister_pernet_subsys(&packet_net_ops); |
1da177e4 LT |
2759 | sock_unregister(PF_PACKET); |
2760 | proto_unregister(&packet_proto); | |
2761 | } | |
2762 | ||
2763 | static int __init packet_init(void) | |
2764 | { | |
2765 | int rc = proto_register(&packet_proto, 0); | |
2766 | ||
2767 | if (rc != 0) | |
2768 | goto out; | |
2769 | ||
2770 | sock_register(&packet_family_ops); | |
d12d01d6 | 2771 | register_pernet_subsys(&packet_net_ops); |
1da177e4 | 2772 | register_netdevice_notifier(&packet_netdev_notifier); |
1da177e4 LT |
2773 | out: |
2774 | return rc; | |
2775 | } | |
2776 | ||
2777 | module_init(packet_init); | |
2778 | module_exit(packet_exit); | |
2779 | MODULE_LICENSE("GPL"); | |
2780 | MODULE_ALIAS_NETPROTO(PF_PACKET); |