Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * PACKET - implements raw packet sockets. | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
11 | * | |
1ce4f28b | 12 | * Fixes: |
1da177e4 LT |
13 | * Alan Cox : verify_area() now used correctly |
14 | * Alan Cox : new skbuff lists, look ma no backlogs! | |
15 | * Alan Cox : tidied skbuff lists. | |
16 | * Alan Cox : Now uses generic datagram routines I | |
17 | * added. Also fixed the peek/read crash | |
18 | * from all old Linux datagram code. | |
19 | * Alan Cox : Uses the improved datagram code. | |
20 | * Alan Cox : Added NULL's for socket options. | |
21 | * Alan Cox : Re-commented the code. | |
22 | * Alan Cox : Use new kernel side addressing | |
23 | * Rob Janssen : Correct MTU usage. | |
24 | * Dave Platt : Counter leaks caused by incorrect | |
25 | * interrupt locking and some slightly | |
26 | * dubious gcc output. Can you read | |
27 | * compiler: it said _VOLATILE_ | |
28 | * Richard Kooijman : Timestamp fixes. | |
29 | * Alan Cox : New buffers. Use sk->mac.raw. | |
30 | * Alan Cox : sendmsg/recvmsg support. | |
31 | * Alan Cox : Protocol setting support | |
32 | * Alexey Kuznetsov : Untied from IPv4 stack. | |
33 | * Cyrus Durgin : Fixed kerneld for kmod. | |
34 | * Michal Ostrowski : Module initialization cleanup. | |
1ce4f28b | 35 | * Ulises Alonso : Frame number limit removal and |
1da177e4 | 36 | * packet_set_ring memory leak. |
0fb375fb EB |
37 | * Eric Biederman : Allow for > 8 byte hardware addresses. |
38 | * The convention is that longer addresses | |
39 | * will simply extend the hardware address | |
1ce4f28b | 40 | * byte arrays at the end of sockaddr_ll |
0fb375fb | 41 | * and packet_mreq. |
69e3c75f | 42 | * Johann Baudy : Added TX RING. |
f6fb8f10 | 43 | * Chetan Loke : Implemented TPACKET_V3 block abstraction |
44 | * layer. | |
45 | * Copyright (C) 2011, <lokec@ccs.neu.edu> | |
46 | * | |
1da177e4 LT |
47 | * |
48 | * This program is free software; you can redistribute it and/or | |
49 | * modify it under the terms of the GNU General Public License | |
50 | * as published by the Free Software Foundation; either version | |
51 | * 2 of the License, or (at your option) any later version. | |
52 | * | |
53 | */ | |
1ce4f28b | 54 | |
1da177e4 | 55 | #include <linux/types.h> |
1da177e4 | 56 | #include <linux/mm.h> |
4fc268d2 | 57 | #include <linux/capability.h> |
1da177e4 LT |
58 | #include <linux/fcntl.h> |
59 | #include <linux/socket.h> | |
60 | #include <linux/in.h> | |
61 | #include <linux/inet.h> | |
62 | #include <linux/netdevice.h> | |
63 | #include <linux/if_packet.h> | |
64 | #include <linux/wireless.h> | |
ffbc6111 | 65 | #include <linux/kernel.h> |
1da177e4 | 66 | #include <linux/kmod.h> |
5a0e3ad6 | 67 | #include <linux/slab.h> |
0e3125c7 | 68 | #include <linux/vmalloc.h> |
457c4cbc | 69 | #include <net/net_namespace.h> |
1da177e4 LT |
70 | #include <net/ip.h> |
71 | #include <net/protocol.h> | |
72 | #include <linux/skbuff.h> | |
73 | #include <net/sock.h> | |
74 | #include <linux/errno.h> | |
75 | #include <linux/timer.h> | |
1da177e4 LT |
76 | #include <asm/uaccess.h> |
77 | #include <asm/ioctls.h> | |
78 | #include <asm/page.h> | |
a1f8e7f7 | 79 | #include <asm/cacheflush.h> |
1da177e4 LT |
80 | #include <asm/io.h> |
81 | #include <linux/proc_fs.h> | |
82 | #include <linux/seq_file.h> | |
83 | #include <linux/poll.h> | |
84 | #include <linux/module.h> | |
85 | #include <linux/init.h> | |
905db440 | 86 | #include <linux/mutex.h> |
05423b24 | 87 | #include <linux/if_vlan.h> |
bfd5f4a3 | 88 | #include <linux/virtio_net.h> |
ed85b565 | 89 | #include <linux/errqueue.h> |
614f60fa | 90 | #include <linux/net_tstamp.h> |
5df0ddfb | 91 | #include <linux/reciprocal_div.h> |
1da177e4 LT |
92 | #ifdef CONFIG_INET |
93 | #include <net/inet_common.h> | |
94 | #endif | |
95 | ||
2787b04b PE |
96 | #include "internal.h" |
97 | ||
1da177e4 LT |
98 | /* |
99 | Assumptions: | |
100 | - if device has no dev->hard_header routine, it adds and removes ll header | |
101 | inside itself. In this case ll header is invisible outside of device, | |
102 | but higher levels still should reserve dev->hard_header_len. | |
103 | Some devices are enough clever to reallocate skb, when header | |
104 | will not fit to reserved space (tunnel), another ones are silly | |
105 | (PPP). | |
106 | - packet socket receives packets with pulled ll header, | |
107 | so that SOCK_RAW should push it back. | |
108 | ||
109 | On receive: | |
110 | ----------- | |
111 | ||
112 | Incoming, dev->hard_header!=NULL | |
b0e380b1 ACM |
113 | mac_header -> ll header |
114 | data -> data | |
1da177e4 LT |
115 | |
116 | Outgoing, dev->hard_header!=NULL | |
b0e380b1 ACM |
117 | mac_header -> ll header |
118 | data -> ll header | |
1da177e4 LT |
119 | |
120 | Incoming, dev->hard_header==NULL | |
b0e380b1 ACM |
121 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
122 | header. PPP makes it, that is wrong, because introduce | |
db0c58f9 | 123 | assymetry between rx and tx paths. |
b0e380b1 | 124 | data -> data |
1da177e4 LT |
125 | |
126 | Outgoing, dev->hard_header==NULL | |
b0e380b1 ACM |
127 | mac_header -> data. ll header is still not built! |
128 | data -> data | |
1da177e4 LT |
129 | |
130 | Resume | |
131 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. | |
132 | ||
133 | ||
134 | On transmit: | |
135 | ------------ | |
136 | ||
137 | dev->hard_header != NULL | |
b0e380b1 ACM |
138 | mac_header -> ll header |
139 | data -> ll header | |
1da177e4 LT |
140 | |
141 | dev->hard_header == NULL (ll header is added by device, we cannot control it) | |
b0e380b1 ACM |
142 | mac_header -> data |
143 | data -> data | |
1da177e4 LT |
144 | |
145 | We should set nh.raw on output to correct posistion, | |
146 | packet classifier depends on it. | |
147 | */ | |
148 | ||
1da177e4 LT |
149 | /* Private packet socket structures. */ |
150 | ||
0fb375fb EB |
151 | /* identical to struct packet_mreq except it has |
152 | * a longer address field. | |
153 | */ | |
40d4e3df | 154 | struct packet_mreq_max { |
0fb375fb EB |
155 | int mr_ifindex; |
156 | unsigned short mr_type; | |
157 | unsigned short mr_alen; | |
158 | unsigned char mr_address[MAX_ADDR_LEN]; | |
1da177e4 | 159 | }; |
a2efcfa0 | 160 | |
184f489e DB |
161 | union tpacket_uhdr { |
162 | struct tpacket_hdr *h1; | |
163 | struct tpacket2_hdr *h2; | |
164 | struct tpacket3_hdr *h3; | |
165 | void *raw; | |
166 | }; | |
167 | ||
f6fb8f10 | 168 | static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u, |
69e3c75f JB |
169 | int closing, int tx_ring); |
170 | ||
f6fb8f10 | 171 | #define V3_ALIGNMENT (8) |
172 | ||
bc59ba39 | 173 | #define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT)) |
f6fb8f10 | 174 | |
175 | #define BLK_PLUS_PRIV(sz_of_priv) \ | |
176 | (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT)) | |
177 | ||
f6fb8f10 | 178 | #define PGV_FROM_VMALLOC 1 |
69e3c75f | 179 | |
f6fb8f10 | 180 | #define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status) |
181 | #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts) | |
182 | #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt) | |
183 | #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len) | |
184 | #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num) | |
185 | #define BLOCK_O2PRIV(x) ((x)->offset_to_priv) | |
186 | #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x))) | |
187 | ||
69e3c75f JB |
188 | struct packet_sock; |
189 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg); | |
77f65ebd WB |
190 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
191 | struct packet_type *pt, struct net_device *orig_dev); | |
1da177e4 | 192 | |
f6fb8f10 | 193 | static void *packet_previous_frame(struct packet_sock *po, |
194 | struct packet_ring_buffer *rb, | |
195 | int status); | |
196 | static void packet_increment_head(struct packet_ring_buffer *buff); | |
bc59ba39 | 197 | static int prb_curr_blk_in_use(struct tpacket_kbdq_core *, |
198 | struct tpacket_block_desc *); | |
199 | static void *prb_dispatch_next_block(struct tpacket_kbdq_core *, | |
f6fb8f10 | 200 | struct packet_sock *); |
bc59ba39 | 201 | static void prb_retire_current_block(struct tpacket_kbdq_core *, |
f6fb8f10 | 202 | struct packet_sock *, unsigned int status); |
bc59ba39 | 203 | static int prb_queue_frozen(struct tpacket_kbdq_core *); |
204 | static void prb_open_block(struct tpacket_kbdq_core *, | |
205 | struct tpacket_block_desc *); | |
f6fb8f10 | 206 | static void prb_retire_rx_blk_timer_expired(unsigned long); |
bc59ba39 | 207 | static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *); |
208 | static void prb_init_blk_timer(struct packet_sock *, | |
209 | struct tpacket_kbdq_core *, | |
210 | void (*func) (unsigned long)); | |
211 | static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *); | |
212 | static void prb_clear_rxhash(struct tpacket_kbdq_core *, | |
213 | struct tpacket3_hdr *); | |
214 | static void prb_fill_vlan_info(struct tpacket_kbdq_core *, | |
215 | struct tpacket3_hdr *); | |
1da177e4 LT |
216 | static void packet_flush_mclist(struct sock *sk); |
217 | ||
ffbc6111 HX |
218 | struct packet_skb_cb { |
219 | unsigned int origlen; | |
220 | union { | |
221 | struct sockaddr_pkt pkt; | |
222 | struct sockaddr_ll ll; | |
223 | } sa; | |
224 | }; | |
225 | ||
226 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) | |
8dc41944 | 227 | |
bc59ba39 | 228 | #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc)) |
f6fb8f10 | 229 | #define GET_PBLOCK_DESC(x, bid) \ |
bc59ba39 | 230 | ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer)) |
f6fb8f10 | 231 | #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \ |
bc59ba39 | 232 | ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer)) |
f6fb8f10 | 233 | #define GET_NEXT_PRB_BLK_NUM(x) \ |
234 | (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \ | |
235 | ((x)->kactive_blk_num+1) : 0) | |
236 | ||
dc99f600 DM |
237 | static void __fanout_unlink(struct sock *sk, struct packet_sock *po); |
238 | static void __fanout_link(struct sock *sk, struct packet_sock *po); | |
239 | ||
d346a3fa DB |
240 | static int packet_direct_xmit(struct sk_buff *skb) |
241 | { | |
242 | struct net_device *dev = skb->dev; | |
243 | const struct net_device_ops *ops = dev->netdev_ops; | |
244 | netdev_features_t features; | |
245 | struct netdev_queue *txq; | |
246 | u16 queue_map; | |
247 | int ret; | |
248 | ||
249 | if (unlikely(!netif_running(dev) || | |
250 | !netif_carrier_ok(dev))) { | |
251 | kfree_skb(skb); | |
252 | return NET_XMIT_DROP; | |
253 | } | |
254 | ||
255 | features = netif_skb_features(skb); | |
256 | if (skb_needs_linearize(skb, features) && | |
257 | __skb_linearize(skb)) { | |
258 | kfree_skb(skb); | |
259 | return NET_XMIT_DROP; | |
260 | } | |
261 | ||
262 | queue_map = skb_get_queue_mapping(skb); | |
263 | txq = netdev_get_tx_queue(dev, queue_map); | |
264 | ||
265 | __netif_tx_lock_bh(txq); | |
266 | if (unlikely(netif_xmit_frozen_or_stopped(txq))) { | |
267 | ret = NETDEV_TX_BUSY; | |
268 | kfree_skb(skb); | |
269 | goto out; | |
270 | } | |
271 | ||
272 | ret = ops->ndo_start_xmit(skb, dev); | |
273 | if (likely(dev_xmit_complete(ret))) | |
274 | txq_trans_update(txq); | |
275 | else | |
276 | kfree_skb(skb); | |
277 | out: | |
278 | __netif_tx_unlock_bh(txq); | |
279 | return ret; | |
280 | } | |
281 | ||
66e56cd4 DB |
282 | static struct net_device *packet_cached_dev_get(struct packet_sock *po) |
283 | { | |
284 | struct net_device *dev; | |
285 | ||
286 | rcu_read_lock(); | |
287 | dev = rcu_dereference(po->cached_dev); | |
288 | if (likely(dev)) | |
289 | dev_hold(dev); | |
290 | rcu_read_unlock(); | |
291 | ||
292 | return dev; | |
293 | } | |
294 | ||
295 | static void packet_cached_dev_assign(struct packet_sock *po, | |
296 | struct net_device *dev) | |
297 | { | |
298 | rcu_assign_pointer(po->cached_dev, dev); | |
299 | } | |
300 | ||
301 | static void packet_cached_dev_reset(struct packet_sock *po) | |
302 | { | |
303 | RCU_INIT_POINTER(po->cached_dev, NULL); | |
304 | } | |
305 | ||
d346a3fa DB |
306 | static bool packet_use_direct_xmit(const struct packet_sock *po) |
307 | { | |
308 | return po->xmit == packet_direct_xmit; | |
309 | } | |
310 | ||
311 | static u16 packet_pick_tx_queue(struct net_device *dev) | |
312 | { | |
313 | return (u16) smp_processor_id() % dev->real_num_tx_queues; | |
314 | } | |
315 | ||
ce06b03e DM |
316 | /* register_prot_hook must be invoked with the po->bind_lock held, |
317 | * or from a context in which asynchronous accesses to the packet | |
318 | * socket is not possible (packet_create()). | |
319 | */ | |
320 | static void register_prot_hook(struct sock *sk) | |
321 | { | |
322 | struct packet_sock *po = pkt_sk(sk); | |
e40526cb | 323 | |
ce06b03e | 324 | if (!po->running) { |
66e56cd4 | 325 | if (po->fanout) |
dc99f600 | 326 | __fanout_link(sk, po); |
66e56cd4 | 327 | else |
dc99f600 | 328 | dev_add_pack(&po->prot_hook); |
e40526cb | 329 | |
ce06b03e DM |
330 | sock_hold(sk); |
331 | po->running = 1; | |
332 | } | |
333 | } | |
334 | ||
335 | /* {,__}unregister_prot_hook() must be invoked with the po->bind_lock | |
336 | * held. If the sync parameter is true, we will temporarily drop | |
337 | * the po->bind_lock and do a synchronize_net to make sure no | |
338 | * asynchronous packet processing paths still refer to the elements | |
339 | * of po->prot_hook. If the sync parameter is false, it is the | |
340 | * callers responsibility to take care of this. | |
341 | */ | |
342 | static void __unregister_prot_hook(struct sock *sk, bool sync) | |
343 | { | |
344 | struct packet_sock *po = pkt_sk(sk); | |
345 | ||
346 | po->running = 0; | |
66e56cd4 DB |
347 | |
348 | if (po->fanout) | |
dc99f600 | 349 | __fanout_unlink(sk, po); |
66e56cd4 | 350 | else |
dc99f600 | 351 | __dev_remove_pack(&po->prot_hook); |
e40526cb | 352 | |
ce06b03e DM |
353 | __sock_put(sk); |
354 | ||
355 | if (sync) { | |
356 | spin_unlock(&po->bind_lock); | |
357 | synchronize_net(); | |
358 | spin_lock(&po->bind_lock); | |
359 | } | |
360 | } | |
361 | ||
362 | static void unregister_prot_hook(struct sock *sk, bool sync) | |
363 | { | |
364 | struct packet_sock *po = pkt_sk(sk); | |
365 | ||
366 | if (po->running) | |
367 | __unregister_prot_hook(sk, sync); | |
368 | } | |
369 | ||
f6dafa95 | 370 | static inline __pure struct page *pgv_to_page(void *addr) |
0af55bb5 CG |
371 | { |
372 | if (is_vmalloc_addr(addr)) | |
373 | return vmalloc_to_page(addr); | |
374 | return virt_to_page(addr); | |
375 | } | |
376 | ||
69e3c75f | 377 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
1da177e4 | 378 | { |
184f489e | 379 | union tpacket_uhdr h; |
1da177e4 | 380 | |
69e3c75f | 381 | h.raw = frame; |
bbd6ef87 PM |
382 | switch (po->tp_version) { |
383 | case TPACKET_V1: | |
69e3c75f | 384 | h.h1->tp_status = status; |
0af55bb5 | 385 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
bbd6ef87 PM |
386 | break; |
387 | case TPACKET_V2: | |
69e3c75f | 388 | h.h2->tp_status = status; |
0af55bb5 | 389 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
bbd6ef87 | 390 | break; |
f6fb8f10 | 391 | case TPACKET_V3: |
69e3c75f | 392 | default: |
f6fb8f10 | 393 | WARN(1, "TPACKET version not supported.\n"); |
69e3c75f | 394 | BUG(); |
bbd6ef87 | 395 | } |
69e3c75f JB |
396 | |
397 | smp_wmb(); | |
bbd6ef87 PM |
398 | } |
399 | ||
69e3c75f | 400 | static int __packet_get_status(struct packet_sock *po, void *frame) |
bbd6ef87 | 401 | { |
184f489e | 402 | union tpacket_uhdr h; |
bbd6ef87 | 403 | |
69e3c75f JB |
404 | smp_rmb(); |
405 | ||
bbd6ef87 PM |
406 | h.raw = frame; |
407 | switch (po->tp_version) { | |
408 | case TPACKET_V1: | |
0af55bb5 | 409 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
69e3c75f | 410 | return h.h1->tp_status; |
bbd6ef87 | 411 | case TPACKET_V2: |
0af55bb5 | 412 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
69e3c75f | 413 | return h.h2->tp_status; |
f6fb8f10 | 414 | case TPACKET_V3: |
69e3c75f | 415 | default: |
f6fb8f10 | 416 | WARN(1, "TPACKET version not supported.\n"); |
69e3c75f JB |
417 | BUG(); |
418 | return 0; | |
bbd6ef87 | 419 | } |
1da177e4 | 420 | } |
69e3c75f | 421 | |
b9c32fb2 DB |
422 | static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts, |
423 | unsigned int flags) | |
7a51384c DB |
424 | { |
425 | struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb); | |
426 | ||
427 | if (shhwtstamps) { | |
428 | if ((flags & SOF_TIMESTAMPING_SYS_HARDWARE) && | |
429 | ktime_to_timespec_cond(shhwtstamps->syststamp, ts)) | |
b9c32fb2 | 430 | return TP_STATUS_TS_SYS_HARDWARE; |
7a51384c DB |
431 | if ((flags & SOF_TIMESTAMPING_RAW_HARDWARE) && |
432 | ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts)) | |
b9c32fb2 | 433 | return TP_STATUS_TS_RAW_HARDWARE; |
7a51384c DB |
434 | } |
435 | ||
436 | if (ktime_to_timespec_cond(skb->tstamp, ts)) | |
b9c32fb2 | 437 | return TP_STATUS_TS_SOFTWARE; |
7a51384c | 438 | |
b9c32fb2 | 439 | return 0; |
7a51384c DB |
440 | } |
441 | ||
b9c32fb2 DB |
442 | static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame, |
443 | struct sk_buff *skb) | |
2e31396f WB |
444 | { |
445 | union tpacket_uhdr h; | |
446 | struct timespec ts; | |
b9c32fb2 | 447 | __u32 ts_status; |
2e31396f | 448 | |
b9c32fb2 DB |
449 | if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp))) |
450 | return 0; | |
2e31396f WB |
451 | |
452 | h.raw = frame; | |
453 | switch (po->tp_version) { | |
454 | case TPACKET_V1: | |
455 | h.h1->tp_sec = ts.tv_sec; | |
456 | h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC; | |
457 | break; | |
458 | case TPACKET_V2: | |
459 | h.h2->tp_sec = ts.tv_sec; | |
460 | h.h2->tp_nsec = ts.tv_nsec; | |
461 | break; | |
462 | case TPACKET_V3: | |
463 | default: | |
464 | WARN(1, "TPACKET version not supported.\n"); | |
465 | BUG(); | |
466 | } | |
467 | ||
468 | /* one flush is safe, as both fields always lie on the same cacheline */ | |
469 | flush_dcache_page(pgv_to_page(&h.h1->tp_sec)); | |
470 | smp_wmb(); | |
b9c32fb2 DB |
471 | |
472 | return ts_status; | |
2e31396f WB |
473 | } |
474 | ||
69e3c75f JB |
475 | static void *packet_lookup_frame(struct packet_sock *po, |
476 | struct packet_ring_buffer *rb, | |
477 | unsigned int position, | |
478 | int status) | |
479 | { | |
480 | unsigned int pg_vec_pos, frame_offset; | |
184f489e | 481 | union tpacket_uhdr h; |
69e3c75f JB |
482 | |
483 | pg_vec_pos = position / rb->frames_per_block; | |
484 | frame_offset = position % rb->frames_per_block; | |
485 | ||
0e3125c7 NH |
486 | h.raw = rb->pg_vec[pg_vec_pos].buffer + |
487 | (frame_offset * rb->frame_size); | |
69e3c75f JB |
488 | |
489 | if (status != __packet_get_status(po, h.raw)) | |
490 | return NULL; | |
491 | ||
492 | return h.raw; | |
493 | } | |
494 | ||
eea49cc9 | 495 | static void *packet_current_frame(struct packet_sock *po, |
69e3c75f JB |
496 | struct packet_ring_buffer *rb, |
497 | int status) | |
498 | { | |
499 | return packet_lookup_frame(po, rb, rb->head, status); | |
500 | } | |
501 | ||
bc59ba39 | 502 | static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc) |
f6fb8f10 | 503 | { |
504 | del_timer_sync(&pkc->retire_blk_timer); | |
505 | } | |
506 | ||
507 | static void prb_shutdown_retire_blk_timer(struct packet_sock *po, | |
508 | int tx_ring, | |
509 | struct sk_buff_head *rb_queue) | |
510 | { | |
bc59ba39 | 511 | struct tpacket_kbdq_core *pkc; |
f6fb8f10 | 512 | |
22781a5b DJ |
513 | pkc = tx_ring ? GET_PBDQC_FROM_RB(&po->tx_ring) : |
514 | GET_PBDQC_FROM_RB(&po->rx_ring); | |
f6fb8f10 | 515 | |
ec6f809f | 516 | spin_lock_bh(&rb_queue->lock); |
f6fb8f10 | 517 | pkc->delete_blk_timer = 1; |
ec6f809f | 518 | spin_unlock_bh(&rb_queue->lock); |
f6fb8f10 | 519 | |
520 | prb_del_retire_blk_timer(pkc); | |
521 | } | |
522 | ||
523 | static void prb_init_blk_timer(struct packet_sock *po, | |
bc59ba39 | 524 | struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 525 | void (*func) (unsigned long)) |
526 | { | |
527 | init_timer(&pkc->retire_blk_timer); | |
528 | pkc->retire_blk_timer.data = (long)po; | |
529 | pkc->retire_blk_timer.function = func; | |
530 | pkc->retire_blk_timer.expires = jiffies; | |
531 | } | |
532 | ||
533 | static void prb_setup_retire_blk_timer(struct packet_sock *po, int tx_ring) | |
534 | { | |
bc59ba39 | 535 | struct tpacket_kbdq_core *pkc; |
f6fb8f10 | 536 | |
537 | if (tx_ring) | |
538 | BUG(); | |
539 | ||
22781a5b DJ |
540 | pkc = tx_ring ? GET_PBDQC_FROM_RB(&po->tx_ring) : |
541 | GET_PBDQC_FROM_RB(&po->rx_ring); | |
f6fb8f10 | 542 | prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired); |
543 | } | |
544 | ||
545 | static int prb_calc_retire_blk_tmo(struct packet_sock *po, | |
546 | int blk_size_in_bytes) | |
547 | { | |
548 | struct net_device *dev; | |
549 | unsigned int mbits = 0, msec = 0, div = 0, tmo = 0; | |
4bc71cb9 JP |
550 | struct ethtool_cmd ecmd; |
551 | int err; | |
e440cf2c | 552 | u32 speed; |
f6fb8f10 | 553 | |
4bc71cb9 JP |
554 | rtnl_lock(); |
555 | dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex); | |
556 | if (unlikely(!dev)) { | |
557 | rtnl_unlock(); | |
f6fb8f10 | 558 | return DEFAULT_PRB_RETIRE_TOV; |
4bc71cb9 JP |
559 | } |
560 | err = __ethtool_get_settings(dev, &ecmd); | |
e440cf2c | 561 | speed = ethtool_cmd_speed(&ecmd); |
4bc71cb9 JP |
562 | rtnl_unlock(); |
563 | if (!err) { | |
4bc71cb9 JP |
564 | /* |
565 | * If the link speed is so slow you don't really | |
566 | * need to worry about perf anyways | |
567 | */ | |
e440cf2c | 568 | if (speed < SPEED_1000 || speed == SPEED_UNKNOWN) { |
4bc71cb9 | 569 | return DEFAULT_PRB_RETIRE_TOV; |
e440cf2c | 570 | } else { |
571 | msec = 1; | |
572 | div = speed / 1000; | |
f6fb8f10 | 573 | } |
574 | } | |
575 | ||
576 | mbits = (blk_size_in_bytes * 8) / (1024 * 1024); | |
577 | ||
578 | if (div) | |
579 | mbits /= div; | |
580 | ||
581 | tmo = mbits * msec; | |
582 | ||
583 | if (div) | |
584 | return tmo+1; | |
585 | return tmo; | |
586 | } | |
587 | ||
bc59ba39 | 588 | static void prb_init_ft_ops(struct tpacket_kbdq_core *p1, |
f6fb8f10 | 589 | union tpacket_req_u *req_u) |
590 | { | |
591 | p1->feature_req_word = req_u->req3.tp_feature_req_word; | |
592 | } | |
593 | ||
594 | static void init_prb_bdqc(struct packet_sock *po, | |
595 | struct packet_ring_buffer *rb, | |
596 | struct pgv *pg_vec, | |
597 | union tpacket_req_u *req_u, int tx_ring) | |
598 | { | |
22781a5b | 599 | struct tpacket_kbdq_core *p1 = GET_PBDQC_FROM_RB(rb); |
bc59ba39 | 600 | struct tpacket_block_desc *pbd; |
f6fb8f10 | 601 | |
602 | memset(p1, 0x0, sizeof(*p1)); | |
603 | ||
604 | p1->knxt_seq_num = 1; | |
605 | p1->pkbdq = pg_vec; | |
bc59ba39 | 606 | pbd = (struct tpacket_block_desc *)pg_vec[0].buffer; |
e3192690 | 607 | p1->pkblk_start = pg_vec[0].buffer; |
f6fb8f10 | 608 | p1->kblk_size = req_u->req3.tp_block_size; |
609 | p1->knum_blocks = req_u->req3.tp_block_nr; | |
610 | p1->hdrlen = po->tp_hdrlen; | |
611 | p1->version = po->tp_version; | |
612 | p1->last_kactive_blk_num = 0; | |
ee80fbf3 | 613 | po->stats.stats3.tp_freeze_q_cnt = 0; |
f6fb8f10 | 614 | if (req_u->req3.tp_retire_blk_tov) |
615 | p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov; | |
616 | else | |
617 | p1->retire_blk_tov = prb_calc_retire_blk_tmo(po, | |
618 | req_u->req3.tp_block_size); | |
619 | p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov); | |
620 | p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv; | |
621 | ||
622 | prb_init_ft_ops(p1, req_u); | |
623 | prb_setup_retire_blk_timer(po, tx_ring); | |
624 | prb_open_block(p1, pbd); | |
625 | } | |
626 | ||
627 | /* Do NOT update the last_blk_num first. | |
628 | * Assumes sk_buff_head lock is held. | |
629 | */ | |
bc59ba39 | 630 | static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc) |
f6fb8f10 | 631 | { |
632 | mod_timer(&pkc->retire_blk_timer, | |
633 | jiffies + pkc->tov_in_jiffies); | |
634 | pkc->last_kactive_blk_num = pkc->kactive_blk_num; | |
635 | } | |
636 | ||
637 | /* | |
638 | * Timer logic: | |
639 | * 1) We refresh the timer only when we open a block. | |
640 | * By doing this we don't waste cycles refreshing the timer | |
641 | * on packet-by-packet basis. | |
642 | * | |
643 | * With a 1MB block-size, on a 1Gbps line, it will take | |
644 | * i) ~8 ms to fill a block + ii) memcpy etc. | |
645 | * In this cut we are not accounting for the memcpy time. | |
646 | * | |
647 | * So, if the user sets the 'tmo' to 10ms then the timer | |
648 | * will never fire while the block is still getting filled | |
649 | * (which is what we want). However, the user could choose | |
650 | * to close a block early and that's fine. | |
651 | * | |
652 | * But when the timer does fire, we check whether or not to refresh it. | |
653 | * Since the tmo granularity is in msecs, it is not too expensive | |
654 | * to refresh the timer, lets say every '8' msecs. | |
655 | * Either the user can set the 'tmo' or we can derive it based on | |
656 | * a) line-speed and b) block-size. | |
657 | * prb_calc_retire_blk_tmo() calculates the tmo. | |
658 | * | |
659 | */ | |
660 | static void prb_retire_rx_blk_timer_expired(unsigned long data) | |
661 | { | |
662 | struct packet_sock *po = (struct packet_sock *)data; | |
22781a5b | 663 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
f6fb8f10 | 664 | unsigned int frozen; |
bc59ba39 | 665 | struct tpacket_block_desc *pbd; |
f6fb8f10 | 666 | |
667 | spin_lock(&po->sk.sk_receive_queue.lock); | |
668 | ||
669 | frozen = prb_queue_frozen(pkc); | |
670 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); | |
671 | ||
672 | if (unlikely(pkc->delete_blk_timer)) | |
673 | goto out; | |
674 | ||
675 | /* We only need to plug the race when the block is partially filled. | |
676 | * tpacket_rcv: | |
677 | * lock(); increment BLOCK_NUM_PKTS; unlock() | |
678 | * copy_bits() is in progress ... | |
679 | * timer fires on other cpu: | |
680 | * we can't retire the current block because copy_bits | |
681 | * is in progress. | |
682 | * | |
683 | */ | |
684 | if (BLOCK_NUM_PKTS(pbd)) { | |
685 | while (atomic_read(&pkc->blk_fill_in_prog)) { | |
686 | /* Waiting for skb_copy_bits to finish... */ | |
687 | cpu_relax(); | |
688 | } | |
689 | } | |
690 | ||
691 | if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) { | |
692 | if (!frozen) { | |
693 | prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO); | |
694 | if (!prb_dispatch_next_block(pkc, po)) | |
695 | goto refresh_timer; | |
696 | else | |
697 | goto out; | |
698 | } else { | |
699 | /* Case 1. Queue was frozen because user-space was | |
700 | * lagging behind. | |
701 | */ | |
702 | if (prb_curr_blk_in_use(pkc, pbd)) { | |
703 | /* | |
704 | * Ok, user-space is still behind. | |
705 | * So just refresh the timer. | |
706 | */ | |
707 | goto refresh_timer; | |
708 | } else { | |
709 | /* Case 2. queue was frozen,user-space caught up, | |
710 | * now the link went idle && the timer fired. | |
711 | * We don't have a block to close.So we open this | |
712 | * block and restart the timer. | |
713 | * opening a block thaws the queue,restarts timer | |
714 | * Thawing/timer-refresh is a side effect. | |
715 | */ | |
716 | prb_open_block(pkc, pbd); | |
717 | goto out; | |
718 | } | |
719 | } | |
720 | } | |
721 | ||
722 | refresh_timer: | |
723 | _prb_refresh_rx_retire_blk_timer(pkc); | |
724 | ||
725 | out: | |
726 | spin_unlock(&po->sk.sk_receive_queue.lock); | |
727 | } | |
728 | ||
eea49cc9 | 729 | static void prb_flush_block(struct tpacket_kbdq_core *pkc1, |
bc59ba39 | 730 | struct tpacket_block_desc *pbd1, __u32 status) |
f6fb8f10 | 731 | { |
732 | /* Flush everything minus the block header */ | |
733 | ||
734 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 | |
735 | u8 *start, *end; | |
736 | ||
737 | start = (u8 *)pbd1; | |
738 | ||
739 | /* Skip the block header(we know header WILL fit in 4K) */ | |
740 | start += PAGE_SIZE; | |
741 | ||
742 | end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end); | |
743 | for (; start < end; start += PAGE_SIZE) | |
744 | flush_dcache_page(pgv_to_page(start)); | |
745 | ||
746 | smp_wmb(); | |
747 | #endif | |
748 | ||
749 | /* Now update the block status. */ | |
750 | ||
751 | BLOCK_STATUS(pbd1) = status; | |
752 | ||
753 | /* Flush the block header */ | |
754 | ||
755 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 | |
756 | start = (u8 *)pbd1; | |
757 | flush_dcache_page(pgv_to_page(start)); | |
758 | ||
759 | smp_wmb(); | |
760 | #endif | |
761 | } | |
762 | ||
763 | /* | |
764 | * Side effect: | |
765 | * | |
766 | * 1) flush the block | |
767 | * 2) Increment active_blk_num | |
768 | * | |
769 | * Note:We DONT refresh the timer on purpose. | |
770 | * Because almost always the next block will be opened. | |
771 | */ | |
bc59ba39 | 772 | static void prb_close_block(struct tpacket_kbdq_core *pkc1, |
773 | struct tpacket_block_desc *pbd1, | |
f6fb8f10 | 774 | struct packet_sock *po, unsigned int stat) |
775 | { | |
776 | __u32 status = TP_STATUS_USER | stat; | |
777 | ||
778 | struct tpacket3_hdr *last_pkt; | |
bc59ba39 | 779 | struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1; |
f6fb8f10 | 780 | |
ee80fbf3 | 781 | if (po->stats.stats3.tp_drops) |
f6fb8f10 | 782 | status |= TP_STATUS_LOSING; |
783 | ||
784 | last_pkt = (struct tpacket3_hdr *)pkc1->prev; | |
785 | last_pkt->tp_next_offset = 0; | |
786 | ||
787 | /* Get the ts of the last pkt */ | |
788 | if (BLOCK_NUM_PKTS(pbd1)) { | |
789 | h1->ts_last_pkt.ts_sec = last_pkt->tp_sec; | |
790 | h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec; | |
791 | } else { | |
792 | /* Ok, we tmo'd - so get the current time */ | |
793 | struct timespec ts; | |
794 | getnstimeofday(&ts); | |
795 | h1->ts_last_pkt.ts_sec = ts.tv_sec; | |
796 | h1->ts_last_pkt.ts_nsec = ts.tv_nsec; | |
797 | } | |
798 | ||
799 | smp_wmb(); | |
800 | ||
801 | /* Flush the block */ | |
802 | prb_flush_block(pkc1, pbd1, status); | |
803 | ||
804 | pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1); | |
805 | } | |
806 | ||
eea49cc9 | 807 | static void prb_thaw_queue(struct tpacket_kbdq_core *pkc) |
f6fb8f10 | 808 | { |
809 | pkc->reset_pending_on_curr_blk = 0; | |
810 | } | |
811 | ||
812 | /* | |
813 | * Side effect of opening a block: | |
814 | * | |
815 | * 1) prb_queue is thawed. | |
816 | * 2) retire_blk_timer is refreshed. | |
817 | * | |
818 | */ | |
bc59ba39 | 819 | static void prb_open_block(struct tpacket_kbdq_core *pkc1, |
820 | struct tpacket_block_desc *pbd1) | |
f6fb8f10 | 821 | { |
822 | struct timespec ts; | |
bc59ba39 | 823 | struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1; |
f6fb8f10 | 824 | |
825 | smp_rmb(); | |
826 | ||
8da3056c DB |
827 | /* We could have just memset this but we will lose the |
828 | * flexibility of making the priv area sticky | |
829 | */ | |
f6fb8f10 | 830 | |
8da3056c DB |
831 | BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++; |
832 | BLOCK_NUM_PKTS(pbd1) = 0; | |
833 | BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); | |
f6fb8f10 | 834 | |
8da3056c DB |
835 | getnstimeofday(&ts); |
836 | ||
837 | h1->ts_first_pkt.ts_sec = ts.tv_sec; | |
838 | h1->ts_first_pkt.ts_nsec = ts.tv_nsec; | |
f6fb8f10 | 839 | |
8da3056c DB |
840 | pkc1->pkblk_start = (char *)pbd1; |
841 | pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); | |
842 | ||
843 | BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); | |
844 | BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN; | |
845 | ||
846 | pbd1->version = pkc1->version; | |
847 | pkc1->prev = pkc1->nxt_offset; | |
848 | pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size; | |
849 | ||
850 | prb_thaw_queue(pkc1); | |
851 | _prb_refresh_rx_retire_blk_timer(pkc1); | |
852 | ||
853 | smp_wmb(); | |
f6fb8f10 | 854 | } |
855 | ||
856 | /* | |
857 | * Queue freeze logic: | |
858 | * 1) Assume tp_block_nr = 8 blocks. | |
859 | * 2) At time 't0', user opens Rx ring. | |
860 | * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7 | |
861 | * 4) user-space is either sleeping or processing block '0'. | |
862 | * 5) tpacket_rcv is currently filling block '7', since there is no space left, | |
863 | * it will close block-7,loop around and try to fill block '0'. | |
864 | * call-flow: | |
865 | * __packet_lookup_frame_in_block | |
866 | * prb_retire_current_block() | |
867 | * prb_dispatch_next_block() | |
868 | * |->(BLOCK_STATUS == USER) evaluates to true | |
869 | * 5.1) Since block-0 is currently in-use, we just freeze the queue. | |
870 | * 6) Now there are two cases: | |
871 | * 6.1) Link goes idle right after the queue is frozen. | |
872 | * But remember, the last open_block() refreshed the timer. | |
873 | * When this timer expires,it will refresh itself so that we can | |
874 | * re-open block-0 in near future. | |
875 | * 6.2) Link is busy and keeps on receiving packets. This is a simple | |
876 | * case and __packet_lookup_frame_in_block will check if block-0 | |
877 | * is free and can now be re-used. | |
878 | */ | |
eea49cc9 | 879 | static void prb_freeze_queue(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 880 | struct packet_sock *po) |
881 | { | |
882 | pkc->reset_pending_on_curr_blk = 1; | |
ee80fbf3 | 883 | po->stats.stats3.tp_freeze_q_cnt++; |
f6fb8f10 | 884 | } |
885 | ||
886 | #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT)) | |
887 | ||
888 | /* | |
889 | * If the next block is free then we will dispatch it | |
890 | * and return a good offset. | |
891 | * Else, we will freeze the queue. | |
892 | * So, caller must check the return value. | |
893 | */ | |
bc59ba39 | 894 | static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 895 | struct packet_sock *po) |
896 | { | |
bc59ba39 | 897 | struct tpacket_block_desc *pbd; |
f6fb8f10 | 898 | |
899 | smp_rmb(); | |
900 | ||
901 | /* 1. Get current block num */ | |
902 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); | |
903 | ||
904 | /* 2. If this block is currently in_use then freeze the queue */ | |
905 | if (TP_STATUS_USER & BLOCK_STATUS(pbd)) { | |
906 | prb_freeze_queue(pkc, po); | |
907 | return NULL; | |
908 | } | |
909 | ||
910 | /* | |
911 | * 3. | |
912 | * open this block and return the offset where the first packet | |
913 | * needs to get stored. | |
914 | */ | |
915 | prb_open_block(pkc, pbd); | |
916 | return (void *)pkc->nxt_offset; | |
917 | } | |
918 | ||
bc59ba39 | 919 | static void prb_retire_current_block(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 920 | struct packet_sock *po, unsigned int status) |
921 | { | |
bc59ba39 | 922 | struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
f6fb8f10 | 923 | |
924 | /* retire/close the current block */ | |
925 | if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) { | |
926 | /* | |
927 | * Plug the case where copy_bits() is in progress on | |
928 | * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't | |
929 | * have space to copy the pkt in the current block and | |
930 | * called prb_retire_current_block() | |
931 | * | |
932 | * We don't need to worry about the TMO case because | |
933 | * the timer-handler already handled this case. | |
934 | */ | |
935 | if (!(status & TP_STATUS_BLK_TMO)) { | |
936 | while (atomic_read(&pkc->blk_fill_in_prog)) { | |
937 | /* Waiting for skb_copy_bits to finish... */ | |
938 | cpu_relax(); | |
939 | } | |
940 | } | |
941 | prb_close_block(pkc, pbd, po, status); | |
942 | return; | |
943 | } | |
f6fb8f10 | 944 | } |
945 | ||
eea49cc9 | 946 | static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc, |
bc59ba39 | 947 | struct tpacket_block_desc *pbd) |
f6fb8f10 | 948 | { |
949 | return TP_STATUS_USER & BLOCK_STATUS(pbd); | |
950 | } | |
951 | ||
eea49cc9 | 952 | static int prb_queue_frozen(struct tpacket_kbdq_core *pkc) |
f6fb8f10 | 953 | { |
954 | return pkc->reset_pending_on_curr_blk; | |
955 | } | |
956 | ||
eea49cc9 | 957 | static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb) |
f6fb8f10 | 958 | { |
bc59ba39 | 959 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb); |
f6fb8f10 | 960 | atomic_dec(&pkc->blk_fill_in_prog); |
961 | } | |
962 | ||
eea49cc9 | 963 | static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 964 | struct tpacket3_hdr *ppd) |
965 | { | |
966 | ppd->hv1.tp_rxhash = skb_get_rxhash(pkc->skb); | |
967 | } | |
968 | ||
eea49cc9 | 969 | static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 970 | struct tpacket3_hdr *ppd) |
971 | { | |
972 | ppd->hv1.tp_rxhash = 0; | |
973 | } | |
974 | ||
eea49cc9 | 975 | static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 976 | struct tpacket3_hdr *ppd) |
977 | { | |
978 | if (vlan_tx_tag_present(pkc->skb)) { | |
979 | ppd->hv1.tp_vlan_tci = vlan_tx_tag_get(pkc->skb); | |
980 | ppd->tp_status = TP_STATUS_VLAN_VALID; | |
981 | } else { | |
9e67030a | 982 | ppd->hv1.tp_vlan_tci = 0; |
983 | ppd->tp_status = TP_STATUS_AVAILABLE; | |
f6fb8f10 | 984 | } |
985 | } | |
986 | ||
bc59ba39 | 987 | static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 988 | struct tpacket3_hdr *ppd) |
989 | { | |
990 | prb_fill_vlan_info(pkc, ppd); | |
991 | ||
992 | if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH) | |
993 | prb_fill_rxhash(pkc, ppd); | |
994 | else | |
995 | prb_clear_rxhash(pkc, ppd); | |
996 | } | |
997 | ||
eea49cc9 | 998 | static void prb_fill_curr_block(char *curr, |
bc59ba39 | 999 | struct tpacket_kbdq_core *pkc, |
1000 | struct tpacket_block_desc *pbd, | |
f6fb8f10 | 1001 | unsigned int len) |
1002 | { | |
1003 | struct tpacket3_hdr *ppd; | |
1004 | ||
1005 | ppd = (struct tpacket3_hdr *)curr; | |
1006 | ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len); | |
1007 | pkc->prev = curr; | |
1008 | pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len); | |
1009 | BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len); | |
1010 | BLOCK_NUM_PKTS(pbd) += 1; | |
1011 | atomic_inc(&pkc->blk_fill_in_prog); | |
1012 | prb_run_all_ft_ops(pkc, ppd); | |
1013 | } | |
1014 | ||
1015 | /* Assumes caller has the sk->rx_queue.lock */ | |
1016 | static void *__packet_lookup_frame_in_block(struct packet_sock *po, | |
1017 | struct sk_buff *skb, | |
1018 | int status, | |
1019 | unsigned int len | |
1020 | ) | |
1021 | { | |
bc59ba39 | 1022 | struct tpacket_kbdq_core *pkc; |
1023 | struct tpacket_block_desc *pbd; | |
f6fb8f10 | 1024 | char *curr, *end; |
1025 | ||
e3192690 | 1026 | pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
f6fb8f10 | 1027 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
1028 | ||
1029 | /* Queue is frozen when user space is lagging behind */ | |
1030 | if (prb_queue_frozen(pkc)) { | |
1031 | /* | |
1032 | * Check if that last block which caused the queue to freeze, | |
1033 | * is still in_use by user-space. | |
1034 | */ | |
1035 | if (prb_curr_blk_in_use(pkc, pbd)) { | |
1036 | /* Can't record this packet */ | |
1037 | return NULL; | |
1038 | } else { | |
1039 | /* | |
1040 | * Ok, the block was released by user-space. | |
1041 | * Now let's open that block. | |
1042 | * opening a block also thaws the queue. | |
1043 | * Thawing is a side effect. | |
1044 | */ | |
1045 | prb_open_block(pkc, pbd); | |
1046 | } | |
1047 | } | |
1048 | ||
1049 | smp_mb(); | |
1050 | curr = pkc->nxt_offset; | |
1051 | pkc->skb = skb; | |
e3192690 | 1052 | end = (char *)pbd + pkc->kblk_size; |
f6fb8f10 | 1053 | |
1054 | /* first try the current block */ | |
1055 | if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) { | |
1056 | prb_fill_curr_block(curr, pkc, pbd, len); | |
1057 | return (void *)curr; | |
1058 | } | |
1059 | ||
1060 | /* Ok, close the current block */ | |
1061 | prb_retire_current_block(pkc, po, 0); | |
1062 | ||
1063 | /* Now, try to dispatch the next block */ | |
1064 | curr = (char *)prb_dispatch_next_block(pkc, po); | |
1065 | if (curr) { | |
1066 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); | |
1067 | prb_fill_curr_block(curr, pkc, pbd, len); | |
1068 | return (void *)curr; | |
1069 | } | |
1070 | ||
1071 | /* | |
1072 | * No free blocks are available.user_space hasn't caught up yet. | |
1073 | * Queue was just frozen and now this packet will get dropped. | |
1074 | */ | |
1075 | return NULL; | |
1076 | } | |
1077 | ||
eea49cc9 | 1078 | static void *packet_current_rx_frame(struct packet_sock *po, |
f6fb8f10 | 1079 | struct sk_buff *skb, |
1080 | int status, unsigned int len) | |
1081 | { | |
1082 | char *curr = NULL; | |
1083 | switch (po->tp_version) { | |
1084 | case TPACKET_V1: | |
1085 | case TPACKET_V2: | |
1086 | curr = packet_lookup_frame(po, &po->rx_ring, | |
1087 | po->rx_ring.head, status); | |
1088 | return curr; | |
1089 | case TPACKET_V3: | |
1090 | return __packet_lookup_frame_in_block(po, skb, status, len); | |
1091 | default: | |
1092 | WARN(1, "TPACKET version not supported\n"); | |
1093 | BUG(); | |
99aa3473 | 1094 | return NULL; |
f6fb8f10 | 1095 | } |
1096 | } | |
1097 | ||
eea49cc9 | 1098 | static void *prb_lookup_block(struct packet_sock *po, |
f6fb8f10 | 1099 | struct packet_ring_buffer *rb, |
77f65ebd | 1100 | unsigned int idx, |
f6fb8f10 | 1101 | int status) |
1102 | { | |
bc59ba39 | 1103 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb); |
77f65ebd | 1104 | struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx); |
f6fb8f10 | 1105 | |
1106 | if (status != BLOCK_STATUS(pbd)) | |
1107 | return NULL; | |
1108 | return pbd; | |
1109 | } | |
1110 | ||
eea49cc9 | 1111 | static int prb_previous_blk_num(struct packet_ring_buffer *rb) |
f6fb8f10 | 1112 | { |
1113 | unsigned int prev; | |
1114 | if (rb->prb_bdqc.kactive_blk_num) | |
1115 | prev = rb->prb_bdqc.kactive_blk_num-1; | |
1116 | else | |
1117 | prev = rb->prb_bdqc.knum_blocks-1; | |
1118 | return prev; | |
1119 | } | |
1120 | ||
1121 | /* Assumes caller has held the rx_queue.lock */ | |
eea49cc9 | 1122 | static void *__prb_previous_block(struct packet_sock *po, |
f6fb8f10 | 1123 | struct packet_ring_buffer *rb, |
1124 | int status) | |
1125 | { | |
1126 | unsigned int previous = prb_previous_blk_num(rb); | |
1127 | return prb_lookup_block(po, rb, previous, status); | |
1128 | } | |
1129 | ||
eea49cc9 | 1130 | static void *packet_previous_rx_frame(struct packet_sock *po, |
f6fb8f10 | 1131 | struct packet_ring_buffer *rb, |
1132 | int status) | |
1133 | { | |
1134 | if (po->tp_version <= TPACKET_V2) | |
1135 | return packet_previous_frame(po, rb, status); | |
1136 | ||
1137 | return __prb_previous_block(po, rb, status); | |
1138 | } | |
1139 | ||
eea49cc9 | 1140 | static void packet_increment_rx_head(struct packet_sock *po, |
f6fb8f10 | 1141 | struct packet_ring_buffer *rb) |
1142 | { | |
1143 | switch (po->tp_version) { | |
1144 | case TPACKET_V1: | |
1145 | case TPACKET_V2: | |
1146 | return packet_increment_head(rb); | |
1147 | case TPACKET_V3: | |
1148 | default: | |
1149 | WARN(1, "TPACKET version not supported.\n"); | |
1150 | BUG(); | |
1151 | return; | |
1152 | } | |
1153 | } | |
1154 | ||
eea49cc9 | 1155 | static void *packet_previous_frame(struct packet_sock *po, |
69e3c75f JB |
1156 | struct packet_ring_buffer *rb, |
1157 | int status) | |
1158 | { | |
1159 | unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; | |
1160 | return packet_lookup_frame(po, rb, previous, status); | |
1161 | } | |
1162 | ||
eea49cc9 | 1163 | static void packet_increment_head(struct packet_ring_buffer *buff) |
69e3c75f JB |
1164 | { |
1165 | buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; | |
1166 | } | |
1167 | ||
77f65ebd WB |
1168 | static bool packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb) |
1169 | { | |
1170 | struct sock *sk = &po->sk; | |
1171 | bool has_room; | |
1172 | ||
1173 | if (po->prot_hook.func != tpacket_rcv) | |
1174 | return (atomic_read(&sk->sk_rmem_alloc) + skb->truesize) | |
1175 | <= sk->sk_rcvbuf; | |
1176 | ||
1177 | spin_lock(&sk->sk_receive_queue.lock); | |
1178 | if (po->tp_version == TPACKET_V3) | |
1179 | has_room = prb_lookup_block(po, &po->rx_ring, | |
1180 | po->rx_ring.prb_bdqc.kactive_blk_num, | |
1181 | TP_STATUS_KERNEL); | |
1182 | else | |
1183 | has_room = packet_lookup_frame(po, &po->rx_ring, | |
1184 | po->rx_ring.head, | |
1185 | TP_STATUS_KERNEL); | |
1186 | spin_unlock(&sk->sk_receive_queue.lock); | |
1187 | ||
1188 | return has_room; | |
1189 | } | |
1190 | ||
1da177e4 LT |
1191 | static void packet_sock_destruct(struct sock *sk) |
1192 | { | |
ed85b565 RC |
1193 | skb_queue_purge(&sk->sk_error_queue); |
1194 | ||
547b792c IJ |
1195 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
1196 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); | |
1da177e4 LT |
1197 | |
1198 | if (!sock_flag(sk, SOCK_DEAD)) { | |
40d4e3df | 1199 | pr_err("Attempt to release alive packet socket: %p\n", sk); |
1da177e4 LT |
1200 | return; |
1201 | } | |
1202 | ||
17ab56a2 | 1203 | sk_refcnt_debug_dec(sk); |
1da177e4 LT |
1204 | } |
1205 | ||
dc99f600 DM |
1206 | static int fanout_rr_next(struct packet_fanout *f, unsigned int num) |
1207 | { | |
1208 | int x = atomic_read(&f->rr_cur) + 1; | |
1209 | ||
1210 | if (x >= num) | |
1211 | x = 0; | |
1212 | ||
1213 | return x; | |
1214 | } | |
1215 | ||
77f65ebd WB |
1216 | static unsigned int fanout_demux_hash(struct packet_fanout *f, |
1217 | struct sk_buff *skb, | |
1218 | unsigned int num) | |
dc99f600 | 1219 | { |
f55d112e | 1220 | return reciprocal_divide(skb->rxhash, num); |
dc99f600 DM |
1221 | } |
1222 | ||
77f65ebd WB |
1223 | static unsigned int fanout_demux_lb(struct packet_fanout *f, |
1224 | struct sk_buff *skb, | |
1225 | unsigned int num) | |
dc99f600 DM |
1226 | { |
1227 | int cur, old; | |
1228 | ||
1229 | cur = atomic_read(&f->rr_cur); | |
1230 | while ((old = atomic_cmpxchg(&f->rr_cur, cur, | |
1231 | fanout_rr_next(f, num))) != cur) | |
1232 | cur = old; | |
77f65ebd WB |
1233 | return cur; |
1234 | } | |
1235 | ||
1236 | static unsigned int fanout_demux_cpu(struct packet_fanout *f, | |
1237 | struct sk_buff *skb, | |
1238 | unsigned int num) | |
1239 | { | |
1240 | return smp_processor_id() % num; | |
dc99f600 DM |
1241 | } |
1242 | ||
5df0ddfb DB |
1243 | static unsigned int fanout_demux_rnd(struct packet_fanout *f, |
1244 | struct sk_buff *skb, | |
1245 | unsigned int num) | |
1246 | { | |
1247 | return reciprocal_divide(prandom_u32(), num); | |
1248 | } | |
1249 | ||
77f65ebd WB |
1250 | static unsigned int fanout_demux_rollover(struct packet_fanout *f, |
1251 | struct sk_buff *skb, | |
1252 | unsigned int idx, unsigned int skip, | |
1253 | unsigned int num) | |
95ec3eb4 | 1254 | { |
77f65ebd | 1255 | unsigned int i, j; |
95ec3eb4 | 1256 | |
77f65ebd WB |
1257 | i = j = min_t(int, f->next[idx], num - 1); |
1258 | do { | |
1259 | if (i != skip && packet_rcv_has_room(pkt_sk(f->arr[i]), skb)) { | |
1260 | if (i != j) | |
1261 | f->next[idx] = i; | |
1262 | return i; | |
1263 | } | |
1264 | if (++i == num) | |
1265 | i = 0; | |
1266 | } while (i != j); | |
1267 | ||
1268 | return idx; | |
1269 | } | |
1270 | ||
1271 | static bool fanout_has_flag(struct packet_fanout *f, u16 flag) | |
1272 | { | |
1273 | return f->flags & (flag >> 8); | |
95ec3eb4 DM |
1274 | } |
1275 | ||
95ec3eb4 DM |
1276 | static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev, |
1277 | struct packet_type *pt, struct net_device *orig_dev) | |
dc99f600 DM |
1278 | { |
1279 | struct packet_fanout *f = pt->af_packet_priv; | |
1280 | unsigned int num = f->num_members; | |
1281 | struct packet_sock *po; | |
77f65ebd | 1282 | unsigned int idx; |
dc99f600 DM |
1283 | |
1284 | if (!net_eq(dev_net(dev), read_pnet(&f->net)) || | |
1285 | !num) { | |
1286 | kfree_skb(skb); | |
1287 | return 0; | |
1288 | } | |
1289 | ||
95ec3eb4 DM |
1290 | switch (f->type) { |
1291 | case PACKET_FANOUT_HASH: | |
1292 | default: | |
77f65ebd | 1293 | if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) { |
bc416d97 | 1294 | skb = ip_check_defrag(skb, IP_DEFRAG_AF_PACKET); |
95ec3eb4 DM |
1295 | if (!skb) |
1296 | return 0; | |
1297 | } | |
1298 | skb_get_rxhash(skb); | |
77f65ebd | 1299 | idx = fanout_demux_hash(f, skb, num); |
95ec3eb4 DM |
1300 | break; |
1301 | case PACKET_FANOUT_LB: | |
77f65ebd | 1302 | idx = fanout_demux_lb(f, skb, num); |
95ec3eb4 DM |
1303 | break; |
1304 | case PACKET_FANOUT_CPU: | |
77f65ebd WB |
1305 | idx = fanout_demux_cpu(f, skb, num); |
1306 | break; | |
5df0ddfb DB |
1307 | case PACKET_FANOUT_RND: |
1308 | idx = fanout_demux_rnd(f, skb, num); | |
1309 | break; | |
77f65ebd WB |
1310 | case PACKET_FANOUT_ROLLOVER: |
1311 | idx = fanout_demux_rollover(f, skb, 0, (unsigned int) -1, num); | |
95ec3eb4 | 1312 | break; |
dc99f600 DM |
1313 | } |
1314 | ||
77f65ebd WB |
1315 | po = pkt_sk(f->arr[idx]); |
1316 | if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER) && | |
1317 | unlikely(!packet_rcv_has_room(po, skb))) { | |
1318 | idx = fanout_demux_rollover(f, skb, idx, idx, num); | |
1319 | po = pkt_sk(f->arr[idx]); | |
1320 | } | |
dc99f600 DM |
1321 | |
1322 | return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev); | |
1323 | } | |
1324 | ||
fff3321d PE |
1325 | DEFINE_MUTEX(fanout_mutex); |
1326 | EXPORT_SYMBOL_GPL(fanout_mutex); | |
dc99f600 DM |
1327 | static LIST_HEAD(fanout_list); |
1328 | ||
1329 | static void __fanout_link(struct sock *sk, struct packet_sock *po) | |
1330 | { | |
1331 | struct packet_fanout *f = po->fanout; | |
1332 | ||
1333 | spin_lock(&f->lock); | |
1334 | f->arr[f->num_members] = sk; | |
1335 | smp_wmb(); | |
1336 | f->num_members++; | |
1337 | spin_unlock(&f->lock); | |
1338 | } | |
1339 | ||
1340 | static void __fanout_unlink(struct sock *sk, struct packet_sock *po) | |
1341 | { | |
1342 | struct packet_fanout *f = po->fanout; | |
1343 | int i; | |
1344 | ||
1345 | spin_lock(&f->lock); | |
1346 | for (i = 0; i < f->num_members; i++) { | |
1347 | if (f->arr[i] == sk) | |
1348 | break; | |
1349 | } | |
1350 | BUG_ON(i >= f->num_members); | |
1351 | f->arr[i] = f->arr[f->num_members - 1]; | |
1352 | f->num_members--; | |
1353 | spin_unlock(&f->lock); | |
1354 | } | |
1355 | ||
a0dfb263 | 1356 | static bool match_fanout_group(struct packet_type *ptype, struct sock * sk) |
c0de08d0 EL |
1357 | { |
1358 | if (ptype->af_packet_priv == (void*)((struct packet_sock *)sk)->fanout) | |
1359 | return true; | |
1360 | ||
1361 | return false; | |
1362 | } | |
1363 | ||
7736d33f | 1364 | static int fanout_add(struct sock *sk, u16 id, u16 type_flags) |
dc99f600 DM |
1365 | { |
1366 | struct packet_sock *po = pkt_sk(sk); | |
1367 | struct packet_fanout *f, *match; | |
7736d33f | 1368 | u8 type = type_flags & 0xff; |
77f65ebd | 1369 | u8 flags = type_flags >> 8; |
dc99f600 DM |
1370 | int err; |
1371 | ||
1372 | switch (type) { | |
77f65ebd WB |
1373 | case PACKET_FANOUT_ROLLOVER: |
1374 | if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER) | |
1375 | return -EINVAL; | |
dc99f600 DM |
1376 | case PACKET_FANOUT_HASH: |
1377 | case PACKET_FANOUT_LB: | |
95ec3eb4 | 1378 | case PACKET_FANOUT_CPU: |
5df0ddfb | 1379 | case PACKET_FANOUT_RND: |
dc99f600 DM |
1380 | break; |
1381 | default: | |
1382 | return -EINVAL; | |
1383 | } | |
1384 | ||
1385 | if (!po->running) | |
1386 | return -EINVAL; | |
1387 | ||
1388 | if (po->fanout) | |
1389 | return -EALREADY; | |
1390 | ||
1391 | mutex_lock(&fanout_mutex); | |
1392 | match = NULL; | |
1393 | list_for_each_entry(f, &fanout_list, list) { | |
1394 | if (f->id == id && | |
1395 | read_pnet(&f->net) == sock_net(sk)) { | |
1396 | match = f; | |
1397 | break; | |
1398 | } | |
1399 | } | |
afe62c68 | 1400 | err = -EINVAL; |
77f65ebd | 1401 | if (match && match->flags != flags) |
afe62c68 | 1402 | goto out; |
dc99f600 | 1403 | if (!match) { |
afe62c68 | 1404 | err = -ENOMEM; |
dc99f600 | 1405 | match = kzalloc(sizeof(*match), GFP_KERNEL); |
afe62c68 ED |
1406 | if (!match) |
1407 | goto out; | |
1408 | write_pnet(&match->net, sock_net(sk)); | |
1409 | match->id = id; | |
1410 | match->type = type; | |
77f65ebd | 1411 | match->flags = flags; |
afe62c68 ED |
1412 | atomic_set(&match->rr_cur, 0); |
1413 | INIT_LIST_HEAD(&match->list); | |
1414 | spin_lock_init(&match->lock); | |
1415 | atomic_set(&match->sk_ref, 0); | |
1416 | match->prot_hook.type = po->prot_hook.type; | |
1417 | match->prot_hook.dev = po->prot_hook.dev; | |
1418 | match->prot_hook.func = packet_rcv_fanout; | |
1419 | match->prot_hook.af_packet_priv = match; | |
c0de08d0 | 1420 | match->prot_hook.id_match = match_fanout_group; |
afe62c68 ED |
1421 | dev_add_pack(&match->prot_hook); |
1422 | list_add(&match->list, &fanout_list); | |
dc99f600 | 1423 | } |
afe62c68 ED |
1424 | err = -EINVAL; |
1425 | if (match->type == type && | |
1426 | match->prot_hook.type == po->prot_hook.type && | |
1427 | match->prot_hook.dev == po->prot_hook.dev) { | |
1428 | err = -ENOSPC; | |
1429 | if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) { | |
1430 | __dev_remove_pack(&po->prot_hook); | |
1431 | po->fanout = match; | |
1432 | atomic_inc(&match->sk_ref); | |
1433 | __fanout_link(sk, po); | |
1434 | err = 0; | |
dc99f600 DM |
1435 | } |
1436 | } | |
afe62c68 | 1437 | out: |
dc99f600 DM |
1438 | mutex_unlock(&fanout_mutex); |
1439 | return err; | |
1440 | } | |
1441 | ||
1442 | static void fanout_release(struct sock *sk) | |
1443 | { | |
1444 | struct packet_sock *po = pkt_sk(sk); | |
1445 | struct packet_fanout *f; | |
1446 | ||
1447 | f = po->fanout; | |
1448 | if (!f) | |
1449 | return; | |
1450 | ||
fff3321d | 1451 | mutex_lock(&fanout_mutex); |
dc99f600 DM |
1452 | po->fanout = NULL; |
1453 | ||
dc99f600 DM |
1454 | if (atomic_dec_and_test(&f->sk_ref)) { |
1455 | list_del(&f->list); | |
1456 | dev_remove_pack(&f->prot_hook); | |
1457 | kfree(f); | |
1458 | } | |
1459 | mutex_unlock(&fanout_mutex); | |
1460 | } | |
1da177e4 | 1461 | |
90ddc4f0 | 1462 | static const struct proto_ops packet_ops; |
1da177e4 | 1463 | |
90ddc4f0 | 1464 | static const struct proto_ops packet_ops_spkt; |
1da177e4 | 1465 | |
40d4e3df ED |
1466 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
1467 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
1468 | { |
1469 | struct sock *sk; | |
1470 | struct sockaddr_pkt *spkt; | |
1471 | ||
1472 | /* | |
1473 | * When we registered the protocol we saved the socket in the data | |
1474 | * field for just this event. | |
1475 | */ | |
1476 | ||
1477 | sk = pt->af_packet_priv; | |
1ce4f28b | 1478 | |
1da177e4 LT |
1479 | /* |
1480 | * Yank back the headers [hope the device set this | |
1481 | * right or kerboom...] | |
1482 | * | |
1483 | * Incoming packets have ll header pulled, | |
1484 | * push it back. | |
1485 | * | |
98e399f8 | 1486 | * For outgoing ones skb->data == skb_mac_header(skb) |
1da177e4 LT |
1487 | * so that this procedure is noop. |
1488 | */ | |
1489 | ||
1490 | if (skb->pkt_type == PACKET_LOOPBACK) | |
1491 | goto out; | |
1492 | ||
09ad9bc7 | 1493 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
1494 | goto out; |
1495 | ||
40d4e3df ED |
1496 | skb = skb_share_check(skb, GFP_ATOMIC); |
1497 | if (skb == NULL) | |
1da177e4 LT |
1498 | goto oom; |
1499 | ||
1500 | /* drop any routing info */ | |
adf30907 | 1501 | skb_dst_drop(skb); |
1da177e4 | 1502 | |
84531c24 PO |
1503 | /* drop conntrack reference */ |
1504 | nf_reset(skb); | |
1505 | ||
ffbc6111 | 1506 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
1da177e4 | 1507 | |
98e399f8 | 1508 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
1509 | |
1510 | /* | |
1511 | * The SOCK_PACKET socket receives _all_ frames. | |
1512 | */ | |
1513 | ||
1514 | spkt->spkt_family = dev->type; | |
1515 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
1516 | spkt->spkt_protocol = skb->protocol; | |
1517 | ||
1518 | /* | |
1519 | * Charge the memory to the socket. This is done specifically | |
1520 | * to prevent sockets using all the memory up. | |
1521 | */ | |
1522 | ||
40d4e3df | 1523 | if (sock_queue_rcv_skb(sk, skb) == 0) |
1da177e4 LT |
1524 | return 0; |
1525 | ||
1526 | out: | |
1527 | kfree_skb(skb); | |
1528 | oom: | |
1529 | return 0; | |
1530 | } | |
1531 | ||
1532 | ||
1533 | /* | |
1534 | * Output a raw packet to a device layer. This bypasses all the other | |
1535 | * protocol layers and you must therefore supply it with a complete frame | |
1536 | */ | |
1ce4f28b | 1537 | |
1da177e4 LT |
1538 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, |
1539 | struct msghdr *msg, size_t len) | |
1540 | { | |
1541 | struct sock *sk = sock->sk; | |
40d4e3df | 1542 | struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name; |
1a35ca80 | 1543 | struct sk_buff *skb = NULL; |
1da177e4 | 1544 | struct net_device *dev; |
40d4e3df | 1545 | __be16 proto = 0; |
1da177e4 | 1546 | int err; |
3bdc0eba | 1547 | int extra_len = 0; |
1ce4f28b | 1548 | |
1da177e4 | 1549 | /* |
1ce4f28b | 1550 | * Get and verify the address. |
1da177e4 LT |
1551 | */ |
1552 | ||
40d4e3df | 1553 | if (saddr) { |
1da177e4 | 1554 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
40d4e3df ED |
1555 | return -EINVAL; |
1556 | if (msg->msg_namelen == sizeof(struct sockaddr_pkt)) | |
1557 | proto = saddr->spkt_protocol; | |
1558 | } else | |
1559 | return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */ | |
1da177e4 LT |
1560 | |
1561 | /* | |
1ce4f28b | 1562 | * Find the device first to size check it |
1da177e4 LT |
1563 | */ |
1564 | ||
de74e92a | 1565 | saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0; |
1a35ca80 | 1566 | retry: |
654d1f8a ED |
1567 | rcu_read_lock(); |
1568 | dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); | |
1da177e4 LT |
1569 | err = -ENODEV; |
1570 | if (dev == NULL) | |
1571 | goto out_unlock; | |
1ce4f28b | 1572 | |
d5e76b0a DM |
1573 | err = -ENETDOWN; |
1574 | if (!(dev->flags & IFF_UP)) | |
1575 | goto out_unlock; | |
1576 | ||
1da177e4 | 1577 | /* |
40d4e3df ED |
1578 | * You may not queue a frame bigger than the mtu. This is the lowest level |
1579 | * raw protocol and you must do your own fragmentation at this level. | |
1da177e4 | 1580 | */ |
1ce4f28b | 1581 | |
3bdc0eba BG |
1582 | if (unlikely(sock_flag(sk, SOCK_NOFCS))) { |
1583 | if (!netif_supports_nofcs(dev)) { | |
1584 | err = -EPROTONOSUPPORT; | |
1585 | goto out_unlock; | |
1586 | } | |
1587 | extra_len = 4; /* We're doing our own CRC */ | |
1588 | } | |
1589 | ||
1da177e4 | 1590 | err = -EMSGSIZE; |
3bdc0eba | 1591 | if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len) |
1da177e4 LT |
1592 | goto out_unlock; |
1593 | ||
1a35ca80 ED |
1594 | if (!skb) { |
1595 | size_t reserved = LL_RESERVED_SPACE(dev); | |
4ce40912 | 1596 | int tlen = dev->needed_tailroom; |
1a35ca80 ED |
1597 | unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0; |
1598 | ||
1599 | rcu_read_unlock(); | |
4ce40912 | 1600 | skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL); |
1a35ca80 ED |
1601 | if (skb == NULL) |
1602 | return -ENOBUFS; | |
1603 | /* FIXME: Save some space for broken drivers that write a hard | |
1604 | * header at transmission time by themselves. PPP is the notable | |
1605 | * one here. This should really be fixed at the driver level. | |
1606 | */ | |
1607 | skb_reserve(skb, reserved); | |
1608 | skb_reset_network_header(skb); | |
1609 | ||
1610 | /* Try to align data part correctly */ | |
1611 | if (hhlen) { | |
1612 | skb->data -= hhlen; | |
1613 | skb->tail -= hhlen; | |
1614 | if (len < hhlen) | |
1615 | skb_reset_network_header(skb); | |
1616 | } | |
1617 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
1618 | if (err) | |
1619 | goto out_free; | |
1620 | goto retry; | |
1da177e4 LT |
1621 | } |
1622 | ||
3bdc0eba | 1623 | if (len > (dev->mtu + dev->hard_header_len + extra_len)) { |
57f89bfa BG |
1624 | /* Earlier code assumed this would be a VLAN pkt, |
1625 | * double-check this now that we have the actual | |
1626 | * packet in hand. | |
1627 | */ | |
1628 | struct ethhdr *ehdr; | |
1629 | skb_reset_mac_header(skb); | |
1630 | ehdr = eth_hdr(skb); | |
1631 | if (ehdr->h_proto != htons(ETH_P_8021Q)) { | |
1632 | err = -EMSGSIZE; | |
1633 | goto out_unlock; | |
1634 | } | |
1635 | } | |
1a35ca80 | 1636 | |
1da177e4 LT |
1637 | skb->protocol = proto; |
1638 | skb->dev = dev; | |
1639 | skb->priority = sk->sk_priority; | |
2d37a186 | 1640 | skb->mark = sk->sk_mark; |
bf84a010 DB |
1641 | |
1642 | sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); | |
1da177e4 | 1643 | |
3bdc0eba BG |
1644 | if (unlikely(extra_len == 4)) |
1645 | skb->no_fcs = 1; | |
1646 | ||
40893fd0 | 1647 | skb_probe_transport_header(skb, 0); |
c1aad275 | 1648 | |
1da177e4 | 1649 | dev_queue_xmit(skb); |
654d1f8a | 1650 | rcu_read_unlock(); |
40d4e3df | 1651 | return len; |
1da177e4 | 1652 | |
1da177e4 | 1653 | out_unlock: |
654d1f8a | 1654 | rcu_read_unlock(); |
1a35ca80 ED |
1655 | out_free: |
1656 | kfree_skb(skb); | |
1da177e4 LT |
1657 | return err; |
1658 | } | |
1da177e4 | 1659 | |
eea49cc9 | 1660 | static unsigned int run_filter(const struct sk_buff *skb, |
62ab0812 | 1661 | const struct sock *sk, |
dbcb5855 | 1662 | unsigned int res) |
1da177e4 LT |
1663 | { |
1664 | struct sk_filter *filter; | |
fda9ef5d | 1665 | |
80f8f102 ED |
1666 | rcu_read_lock(); |
1667 | filter = rcu_dereference(sk->sk_filter); | |
dbcb5855 | 1668 | if (filter != NULL) |
0a14842f | 1669 | res = SK_RUN_FILTER(filter, skb); |
80f8f102 | 1670 | rcu_read_unlock(); |
1da177e4 | 1671 | |
dbcb5855 | 1672 | return res; |
1da177e4 LT |
1673 | } |
1674 | ||
1675 | /* | |
62ab0812 ED |
1676 | * This function makes lazy skb cloning in hope that most of packets |
1677 | * are discarded by BPF. | |
1678 | * | |
1679 | * Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
1680 | * and skb->cb are mangled. It works because (and until) packets | |
1681 | * falling here are owned by current CPU. Output packets are cloned | |
1682 | * by dev_queue_xmit_nit(), input packets are processed by net_bh | |
1683 | * sequencially, so that if we return skb to original state on exit, | |
1684 | * we will not harm anyone. | |
1da177e4 LT |
1685 | */ |
1686 | ||
40d4e3df ED |
1687 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
1688 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
1689 | { |
1690 | struct sock *sk; | |
1691 | struct sockaddr_ll *sll; | |
1692 | struct packet_sock *po; | |
40d4e3df | 1693 | u8 *skb_head = skb->data; |
1da177e4 | 1694 | int skb_len = skb->len; |
dbcb5855 | 1695 | unsigned int snaplen, res; |
1da177e4 LT |
1696 | |
1697 | if (skb->pkt_type == PACKET_LOOPBACK) | |
1698 | goto drop; | |
1699 | ||
1700 | sk = pt->af_packet_priv; | |
1701 | po = pkt_sk(sk); | |
1702 | ||
09ad9bc7 | 1703 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
1704 | goto drop; |
1705 | ||
1da177e4 LT |
1706 | skb->dev = dev; |
1707 | ||
3b04ddde | 1708 | if (dev->header_ops) { |
1da177e4 | 1709 | /* The device has an explicit notion of ll header, |
62ab0812 ED |
1710 | * exported to higher levels. |
1711 | * | |
1712 | * Otherwise, the device hides details of its frame | |
1713 | * structure, so that corresponding packet head is | |
1714 | * never delivered to user. | |
1da177e4 LT |
1715 | */ |
1716 | if (sk->sk_type != SOCK_DGRAM) | |
98e399f8 | 1717 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
1718 | else if (skb->pkt_type == PACKET_OUTGOING) { |
1719 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 1720 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
1721 | } |
1722 | } | |
1723 | ||
1724 | snaplen = skb->len; | |
1725 | ||
dbcb5855 DM |
1726 | res = run_filter(skb, sk, snaplen); |
1727 | if (!res) | |
fda9ef5d | 1728 | goto drop_n_restore; |
dbcb5855 DM |
1729 | if (snaplen > res) |
1730 | snaplen = res; | |
1da177e4 | 1731 | |
0fd7bac6 | 1732 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) |
1da177e4 LT |
1733 | goto drop_n_acct; |
1734 | ||
1735 | if (skb_shared(skb)) { | |
1736 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
1737 | if (nskb == NULL) | |
1738 | goto drop_n_acct; | |
1739 | ||
1740 | if (skb_head != skb->data) { | |
1741 | skb->data = skb_head; | |
1742 | skb->len = skb_len; | |
1743 | } | |
abc4e4fa | 1744 | consume_skb(skb); |
1da177e4 LT |
1745 | skb = nskb; |
1746 | } | |
1747 | ||
ffbc6111 HX |
1748 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
1749 | sizeof(skb->cb)); | |
1750 | ||
1751 | sll = &PACKET_SKB_CB(skb)->sa.ll; | |
1da177e4 LT |
1752 | sll->sll_family = AF_PACKET; |
1753 | sll->sll_hatype = dev->type; | |
1754 | sll->sll_protocol = skb->protocol; | |
1755 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 1756 | if (unlikely(po->origdev)) |
80feaacb PWJ |
1757 | sll->sll_ifindex = orig_dev->ifindex; |
1758 | else | |
1759 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 1760 | |
b95cce35 | 1761 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 | 1762 | |
ffbc6111 | 1763 | PACKET_SKB_CB(skb)->origlen = skb->len; |
8dc41944 | 1764 | |
1da177e4 LT |
1765 | if (pskb_trim(skb, snaplen)) |
1766 | goto drop_n_acct; | |
1767 | ||
1768 | skb_set_owner_r(skb, sk); | |
1769 | skb->dev = NULL; | |
adf30907 | 1770 | skb_dst_drop(skb); |
1da177e4 | 1771 | |
84531c24 PO |
1772 | /* drop conntrack reference */ |
1773 | nf_reset(skb); | |
1774 | ||
1da177e4 | 1775 | spin_lock(&sk->sk_receive_queue.lock); |
ee80fbf3 | 1776 | po->stats.stats1.tp_packets++; |
3b885787 | 1777 | skb->dropcount = atomic_read(&sk->sk_drops); |
1da177e4 LT |
1778 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
1779 | spin_unlock(&sk->sk_receive_queue.lock); | |
1780 | sk->sk_data_ready(sk, skb->len); | |
1781 | return 0; | |
1782 | ||
1783 | drop_n_acct: | |
7091fbd8 | 1784 | spin_lock(&sk->sk_receive_queue.lock); |
ee80fbf3 | 1785 | po->stats.stats1.tp_drops++; |
7091fbd8 WB |
1786 | atomic_inc(&sk->sk_drops); |
1787 | spin_unlock(&sk->sk_receive_queue.lock); | |
1da177e4 LT |
1788 | |
1789 | drop_n_restore: | |
1790 | if (skb_head != skb->data && skb_shared(skb)) { | |
1791 | skb->data = skb_head; | |
1792 | skb->len = skb_len; | |
1793 | } | |
1794 | drop: | |
ead2ceb0 | 1795 | consume_skb(skb); |
1da177e4 LT |
1796 | return 0; |
1797 | } | |
1798 | ||
40d4e3df ED |
1799 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
1800 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
1801 | { |
1802 | struct sock *sk; | |
1803 | struct packet_sock *po; | |
1804 | struct sockaddr_ll *sll; | |
184f489e | 1805 | union tpacket_uhdr h; |
40d4e3df | 1806 | u8 *skb_head = skb->data; |
1da177e4 | 1807 | int skb_len = skb->len; |
dbcb5855 | 1808 | unsigned int snaplen, res; |
f6fb8f10 | 1809 | unsigned long status = TP_STATUS_USER; |
bbd6ef87 | 1810 | unsigned short macoff, netoff, hdrlen; |
1da177e4 | 1811 | struct sk_buff *copy_skb = NULL; |
bbd6ef87 | 1812 | struct timespec ts; |
b9c32fb2 | 1813 | __u32 ts_status; |
1da177e4 LT |
1814 | |
1815 | if (skb->pkt_type == PACKET_LOOPBACK) | |
1816 | goto drop; | |
1817 | ||
1818 | sk = pt->af_packet_priv; | |
1819 | po = pkt_sk(sk); | |
1820 | ||
09ad9bc7 | 1821 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
1822 | goto drop; |
1823 | ||
3b04ddde | 1824 | if (dev->header_ops) { |
1da177e4 | 1825 | if (sk->sk_type != SOCK_DGRAM) |
98e399f8 | 1826 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
1827 | else if (skb->pkt_type == PACKET_OUTGOING) { |
1828 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 1829 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
1830 | } |
1831 | } | |
1832 | ||
8dc41944 HX |
1833 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
1834 | status |= TP_STATUS_CSUMNOTREADY; | |
1835 | ||
1da177e4 LT |
1836 | snaplen = skb->len; |
1837 | ||
dbcb5855 DM |
1838 | res = run_filter(skb, sk, snaplen); |
1839 | if (!res) | |
fda9ef5d | 1840 | goto drop_n_restore; |
dbcb5855 DM |
1841 | if (snaplen > res) |
1842 | snaplen = res; | |
1da177e4 LT |
1843 | |
1844 | if (sk->sk_type == SOCK_DGRAM) { | |
8913336a PM |
1845 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
1846 | po->tp_reserve; | |
1da177e4 | 1847 | } else { |
95c96174 | 1848 | unsigned int maclen = skb_network_offset(skb); |
bbd6ef87 | 1849 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
8913336a PM |
1850 | (maclen < 16 ? 16 : maclen)) + |
1851 | po->tp_reserve; | |
1da177e4 LT |
1852 | macoff = netoff - maclen; |
1853 | } | |
f6fb8f10 | 1854 | if (po->tp_version <= TPACKET_V2) { |
1855 | if (macoff + snaplen > po->rx_ring.frame_size) { | |
1856 | if (po->copy_thresh && | |
0fd7bac6 | 1857 | atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { |
f6fb8f10 | 1858 | if (skb_shared(skb)) { |
1859 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
1860 | } else { | |
1861 | copy_skb = skb_get(skb); | |
1862 | skb_head = skb->data; | |
1863 | } | |
1864 | if (copy_skb) | |
1865 | skb_set_owner_r(copy_skb, sk); | |
1da177e4 | 1866 | } |
f6fb8f10 | 1867 | snaplen = po->rx_ring.frame_size - macoff; |
1868 | if ((int)snaplen < 0) | |
1869 | snaplen = 0; | |
1da177e4 | 1870 | } |
1da177e4 | 1871 | } |
1da177e4 | 1872 | spin_lock(&sk->sk_receive_queue.lock); |
f6fb8f10 | 1873 | h.raw = packet_current_rx_frame(po, skb, |
1874 | TP_STATUS_KERNEL, (macoff+snaplen)); | |
bbd6ef87 | 1875 | if (!h.raw) |
1da177e4 | 1876 | goto ring_is_full; |
f6fb8f10 | 1877 | if (po->tp_version <= TPACKET_V2) { |
1878 | packet_increment_rx_head(po, &po->rx_ring); | |
1879 | /* | |
1880 | * LOSING will be reported till you read the stats, | |
1881 | * because it's COR - Clear On Read. | |
1882 | * Anyways, moving it for V1/V2 only as V3 doesn't need this | |
1883 | * at packet level. | |
1884 | */ | |
ee80fbf3 | 1885 | if (po->stats.stats1.tp_drops) |
f6fb8f10 | 1886 | status |= TP_STATUS_LOSING; |
1887 | } | |
ee80fbf3 | 1888 | po->stats.stats1.tp_packets++; |
1da177e4 LT |
1889 | if (copy_skb) { |
1890 | status |= TP_STATUS_COPY; | |
1891 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
1892 | } | |
1da177e4 LT |
1893 | spin_unlock(&sk->sk_receive_queue.lock); |
1894 | ||
bbd6ef87 | 1895 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
b9c32fb2 DB |
1896 | |
1897 | if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp))) | |
7a51384c | 1898 | getnstimeofday(&ts); |
1da177e4 | 1899 | |
b9c32fb2 DB |
1900 | status |= ts_status; |
1901 | ||
bbd6ef87 PM |
1902 | switch (po->tp_version) { |
1903 | case TPACKET_V1: | |
1904 | h.h1->tp_len = skb->len; | |
1905 | h.h1->tp_snaplen = snaplen; | |
1906 | h.h1->tp_mac = macoff; | |
1907 | h.h1->tp_net = netoff; | |
4b457bdf DB |
1908 | h.h1->tp_sec = ts.tv_sec; |
1909 | h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC; | |
bbd6ef87 PM |
1910 | hdrlen = sizeof(*h.h1); |
1911 | break; | |
1912 | case TPACKET_V2: | |
1913 | h.h2->tp_len = skb->len; | |
1914 | h.h2->tp_snaplen = snaplen; | |
1915 | h.h2->tp_mac = macoff; | |
1916 | h.h2->tp_net = netoff; | |
bbd6ef87 PM |
1917 | h.h2->tp_sec = ts.tv_sec; |
1918 | h.h2->tp_nsec = ts.tv_nsec; | |
a3bcc23e BG |
1919 | if (vlan_tx_tag_present(skb)) { |
1920 | h.h2->tp_vlan_tci = vlan_tx_tag_get(skb); | |
1921 | status |= TP_STATUS_VLAN_VALID; | |
1922 | } else { | |
1923 | h.h2->tp_vlan_tci = 0; | |
1924 | } | |
13fcb7bd | 1925 | h.h2->tp_padding = 0; |
bbd6ef87 PM |
1926 | hdrlen = sizeof(*h.h2); |
1927 | break; | |
f6fb8f10 | 1928 | case TPACKET_V3: |
1929 | /* tp_nxt_offset,vlan are already populated above. | |
1930 | * So DONT clear those fields here | |
1931 | */ | |
1932 | h.h3->tp_status |= status; | |
1933 | h.h3->tp_len = skb->len; | |
1934 | h.h3->tp_snaplen = snaplen; | |
1935 | h.h3->tp_mac = macoff; | |
1936 | h.h3->tp_net = netoff; | |
f6fb8f10 | 1937 | h.h3->tp_sec = ts.tv_sec; |
1938 | h.h3->tp_nsec = ts.tv_nsec; | |
1939 | hdrlen = sizeof(*h.h3); | |
1940 | break; | |
bbd6ef87 PM |
1941 | default: |
1942 | BUG(); | |
1943 | } | |
1da177e4 | 1944 | |
bbd6ef87 | 1945 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
b95cce35 | 1946 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 LT |
1947 | sll->sll_family = AF_PACKET; |
1948 | sll->sll_hatype = dev->type; | |
1949 | sll->sll_protocol = skb->protocol; | |
1950 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 1951 | if (unlikely(po->origdev)) |
80feaacb PWJ |
1952 | sll->sll_ifindex = orig_dev->ifindex; |
1953 | else | |
1954 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 1955 | |
e16aa207 | 1956 | smp_mb(); |
f6dafa95 | 1957 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
1da177e4 | 1958 | { |
0af55bb5 CG |
1959 | u8 *start, *end; |
1960 | ||
f6fb8f10 | 1961 | if (po->tp_version <= TPACKET_V2) { |
1962 | end = (u8 *)PAGE_ALIGN((unsigned long)h.raw | |
1963 | + macoff + snaplen); | |
1964 | for (start = h.raw; start < end; start += PAGE_SIZE) | |
1965 | flush_dcache_page(pgv_to_page(start)); | |
1966 | } | |
cc9f01b2 | 1967 | smp_wmb(); |
1da177e4 | 1968 | } |
f6dafa95 | 1969 | #endif |
f6fb8f10 | 1970 | if (po->tp_version <= TPACKET_V2) |
1971 | __packet_set_status(po, h.raw, status); | |
1972 | else | |
1973 | prb_clear_blk_fill_status(&po->rx_ring); | |
1da177e4 LT |
1974 | |
1975 | sk->sk_data_ready(sk, 0); | |
1976 | ||
1977 | drop_n_restore: | |
1978 | if (skb_head != skb->data && skb_shared(skb)) { | |
1979 | skb->data = skb_head; | |
1980 | skb->len = skb_len; | |
1981 | } | |
1982 | drop: | |
1ce4f28b | 1983 | kfree_skb(skb); |
1da177e4 LT |
1984 | return 0; |
1985 | ||
1986 | ring_is_full: | |
ee80fbf3 | 1987 | po->stats.stats1.tp_drops++; |
1da177e4 LT |
1988 | spin_unlock(&sk->sk_receive_queue.lock); |
1989 | ||
1990 | sk->sk_data_ready(sk, 0); | |
acb5d75b | 1991 | kfree_skb(copy_skb); |
1da177e4 LT |
1992 | goto drop_n_restore; |
1993 | } | |
1994 | ||
69e3c75f JB |
1995 | static void tpacket_destruct_skb(struct sk_buff *skb) |
1996 | { | |
1997 | struct packet_sock *po = pkt_sk(skb->sk); | |
40d4e3df | 1998 | void *ph; |
1da177e4 | 1999 | |
69e3c75f | 2000 | if (likely(po->tx_ring.pg_vec)) { |
b9c32fb2 DB |
2001 | __u32 ts; |
2002 | ||
69e3c75f | 2003 | ph = skb_shinfo(skb)->destructor_arg; |
69e3c75f JB |
2004 | BUG_ON(atomic_read(&po->tx_ring.pending) == 0); |
2005 | atomic_dec(&po->tx_ring.pending); | |
b9c32fb2 DB |
2006 | |
2007 | ts = __packet_set_timestamp(po, ph, skb); | |
2008 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts); | |
69e3c75f JB |
2009 | } |
2010 | ||
2011 | sock_wfree(skb); | |
2012 | } | |
2013 | ||
40d4e3df ED |
2014 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
2015 | void *frame, struct net_device *dev, int size_max, | |
ae641949 | 2016 | __be16 proto, unsigned char *addr, int hlen) |
69e3c75f | 2017 | { |
184f489e | 2018 | union tpacket_uhdr ph; |
09effa67 | 2019 | int to_write, offset, len, tp_len, nr_frags, len_max; |
69e3c75f JB |
2020 | struct socket *sock = po->sk.sk_socket; |
2021 | struct page *page; | |
2022 | void *data; | |
2023 | int err; | |
2024 | ||
2025 | ph.raw = frame; | |
2026 | ||
2027 | skb->protocol = proto; | |
2028 | skb->dev = dev; | |
2029 | skb->priority = po->sk.sk_priority; | |
2d37a186 | 2030 | skb->mark = po->sk.sk_mark; |
2e31396f | 2031 | sock_tx_timestamp(&po->sk, &skb_shinfo(skb)->tx_flags); |
69e3c75f JB |
2032 | skb_shinfo(skb)->destructor_arg = ph.raw; |
2033 | ||
2034 | switch (po->tp_version) { | |
2035 | case TPACKET_V2: | |
2036 | tp_len = ph.h2->tp_len; | |
2037 | break; | |
2038 | default: | |
2039 | tp_len = ph.h1->tp_len; | |
2040 | break; | |
2041 | } | |
09effa67 DM |
2042 | if (unlikely(tp_len > size_max)) { |
2043 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); | |
2044 | return -EMSGSIZE; | |
2045 | } | |
69e3c75f | 2046 | |
ae641949 | 2047 | skb_reserve(skb, hlen); |
69e3c75f | 2048 | skb_reset_network_header(skb); |
c1aad275 | 2049 | |
d346a3fa DB |
2050 | if (!packet_use_direct_xmit(po)) |
2051 | skb_probe_transport_header(skb, 0); | |
2052 | if (unlikely(po->tp_tx_has_off)) { | |
5920cd3a PC |
2053 | int off_min, off_max, off; |
2054 | off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll); | |
2055 | off_max = po->tx_ring.frame_size - tp_len; | |
2056 | if (sock->type == SOCK_DGRAM) { | |
2057 | switch (po->tp_version) { | |
2058 | case TPACKET_V2: | |
2059 | off = ph.h2->tp_net; | |
2060 | break; | |
2061 | default: | |
2062 | off = ph.h1->tp_net; | |
2063 | break; | |
2064 | } | |
2065 | } else { | |
2066 | switch (po->tp_version) { | |
2067 | case TPACKET_V2: | |
2068 | off = ph.h2->tp_mac; | |
2069 | break; | |
2070 | default: | |
2071 | off = ph.h1->tp_mac; | |
2072 | break; | |
2073 | } | |
2074 | } | |
2075 | if (unlikely((off < off_min) || (off_max < off))) | |
2076 | return -EINVAL; | |
2077 | data = ph.raw + off; | |
2078 | } else { | |
2079 | data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll); | |
2080 | } | |
69e3c75f JB |
2081 | to_write = tp_len; |
2082 | ||
2083 | if (sock->type == SOCK_DGRAM) { | |
2084 | err = dev_hard_header(skb, dev, ntohs(proto), addr, | |
2085 | NULL, tp_len); | |
2086 | if (unlikely(err < 0)) | |
2087 | return -EINVAL; | |
40d4e3df | 2088 | } else if (dev->hard_header_len) { |
69e3c75f JB |
2089 | /* net device doesn't like empty head */ |
2090 | if (unlikely(tp_len <= dev->hard_header_len)) { | |
40d4e3df ED |
2091 | pr_err("packet size is too short (%d < %d)\n", |
2092 | tp_len, dev->hard_header_len); | |
69e3c75f JB |
2093 | return -EINVAL; |
2094 | } | |
2095 | ||
2096 | skb_push(skb, dev->hard_header_len); | |
2097 | err = skb_store_bits(skb, 0, data, | |
2098 | dev->hard_header_len); | |
2099 | if (unlikely(err)) | |
2100 | return err; | |
2101 | ||
2102 | data += dev->hard_header_len; | |
2103 | to_write -= dev->hard_header_len; | |
2104 | } | |
2105 | ||
69e3c75f JB |
2106 | offset = offset_in_page(data); |
2107 | len_max = PAGE_SIZE - offset; | |
2108 | len = ((to_write > len_max) ? len_max : to_write); | |
2109 | ||
2110 | skb->data_len = to_write; | |
2111 | skb->len += to_write; | |
2112 | skb->truesize += to_write; | |
2113 | atomic_add(to_write, &po->sk.sk_wmem_alloc); | |
2114 | ||
2115 | while (likely(to_write)) { | |
2116 | nr_frags = skb_shinfo(skb)->nr_frags; | |
2117 | ||
2118 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { | |
40d4e3df ED |
2119 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
2120 | MAX_SKB_FRAGS); | |
69e3c75f JB |
2121 | return -EFAULT; |
2122 | } | |
2123 | ||
0af55bb5 CG |
2124 | page = pgv_to_page(data); |
2125 | data += len; | |
69e3c75f JB |
2126 | flush_dcache_page(page); |
2127 | get_page(page); | |
0af55bb5 | 2128 | skb_fill_page_desc(skb, nr_frags, page, offset, len); |
69e3c75f JB |
2129 | to_write -= len; |
2130 | offset = 0; | |
2131 | len_max = PAGE_SIZE; | |
2132 | len = ((to_write > len_max) ? len_max : to_write); | |
2133 | } | |
2134 | ||
2135 | return tp_len; | |
2136 | } | |
2137 | ||
2138 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) | |
2139 | { | |
69e3c75f JB |
2140 | struct sk_buff *skb; |
2141 | struct net_device *dev; | |
2142 | __be16 proto; | |
09effa67 | 2143 | int err, reserve = 0; |
40d4e3df ED |
2144 | void *ph; |
2145 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; | |
69e3c75f JB |
2146 | int tp_len, size_max; |
2147 | unsigned char *addr; | |
2148 | int len_sum = 0; | |
9e67030a | 2149 | int status = TP_STATUS_AVAILABLE; |
ae641949 | 2150 | int hlen, tlen; |
69e3c75f | 2151 | |
69e3c75f JB |
2152 | mutex_lock(&po->pg_vec_lock); |
2153 | ||
66e56cd4 | 2154 | if (likely(saddr == NULL)) { |
e40526cb | 2155 | dev = packet_cached_dev_get(po); |
69e3c75f JB |
2156 | proto = po->num; |
2157 | addr = NULL; | |
2158 | } else { | |
2159 | err = -EINVAL; | |
2160 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
2161 | goto out; | |
2162 | if (msg->msg_namelen < (saddr->sll_halen | |
2163 | + offsetof(struct sockaddr_ll, | |
2164 | sll_addr))) | |
2165 | goto out; | |
69e3c75f JB |
2166 | proto = saddr->sll_protocol; |
2167 | addr = saddr->sll_addr; | |
827d9780 | 2168 | dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex); |
69e3c75f JB |
2169 | } |
2170 | ||
69e3c75f JB |
2171 | err = -ENXIO; |
2172 | if (unlikely(dev == NULL)) | |
2173 | goto out; | |
69e3c75f JB |
2174 | err = -ENETDOWN; |
2175 | if (unlikely(!(dev->flags & IFF_UP))) | |
2176 | goto out_put; | |
2177 | ||
e40526cb DB |
2178 | reserve = dev->hard_header_len; |
2179 | ||
69e3c75f | 2180 | size_max = po->tx_ring.frame_size |
b5dd884e | 2181 | - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
69e3c75f | 2182 | |
09effa67 DM |
2183 | if (size_max > dev->mtu + reserve) |
2184 | size_max = dev->mtu + reserve; | |
2185 | ||
69e3c75f JB |
2186 | do { |
2187 | ph = packet_current_frame(po, &po->tx_ring, | |
2188 | TP_STATUS_SEND_REQUEST); | |
2189 | ||
2190 | if (unlikely(ph == NULL)) { | |
2191 | schedule(); | |
2192 | continue; | |
2193 | } | |
2194 | ||
2195 | status = TP_STATUS_SEND_REQUEST; | |
ae641949 HX |
2196 | hlen = LL_RESERVED_SPACE(dev); |
2197 | tlen = dev->needed_tailroom; | |
69e3c75f | 2198 | skb = sock_alloc_send_skb(&po->sk, |
ae641949 | 2199 | hlen + tlen + sizeof(struct sockaddr_ll), |
69e3c75f JB |
2200 | 0, &err); |
2201 | ||
2202 | if (unlikely(skb == NULL)) | |
2203 | goto out_status; | |
2204 | ||
2205 | tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto, | |
ae641949 | 2206 | addr, hlen); |
69e3c75f JB |
2207 | |
2208 | if (unlikely(tp_len < 0)) { | |
2209 | if (po->tp_loss) { | |
2210 | __packet_set_status(po, ph, | |
2211 | TP_STATUS_AVAILABLE); | |
2212 | packet_increment_head(&po->tx_ring); | |
2213 | kfree_skb(skb); | |
2214 | continue; | |
2215 | } else { | |
2216 | status = TP_STATUS_WRONG_FORMAT; | |
2217 | err = tp_len; | |
2218 | goto out_status; | |
2219 | } | |
2220 | } | |
2221 | ||
d346a3fa | 2222 | skb_set_queue_mapping(skb, packet_pick_tx_queue(dev)); |
69e3c75f JB |
2223 | skb->destructor = tpacket_destruct_skb; |
2224 | __packet_set_status(po, ph, TP_STATUS_SENDING); | |
2225 | atomic_inc(&po->tx_ring.pending); | |
2226 | ||
2227 | status = TP_STATUS_SEND_REQUEST; | |
d346a3fa | 2228 | err = po->xmit(skb); |
eb70df13 JP |
2229 | if (unlikely(err > 0)) { |
2230 | err = net_xmit_errno(err); | |
2231 | if (err && __packet_get_status(po, ph) == | |
2232 | TP_STATUS_AVAILABLE) { | |
2233 | /* skb was destructed already */ | |
2234 | skb = NULL; | |
2235 | goto out_status; | |
2236 | } | |
2237 | /* | |
2238 | * skb was dropped but not destructed yet; | |
2239 | * let's treat it like congestion or err < 0 | |
2240 | */ | |
2241 | err = 0; | |
2242 | } | |
69e3c75f JB |
2243 | packet_increment_head(&po->tx_ring); |
2244 | len_sum += tp_len; | |
f64f9e71 JP |
2245 | } while (likely((ph != NULL) || |
2246 | ((!(msg->msg_flags & MSG_DONTWAIT)) && | |
2247 | (atomic_read(&po->tx_ring.pending)))) | |
2248 | ); | |
69e3c75f JB |
2249 | |
2250 | err = len_sum; | |
2251 | goto out_put; | |
2252 | ||
69e3c75f JB |
2253 | out_status: |
2254 | __packet_set_status(po, ph, status); | |
2255 | kfree_skb(skb); | |
2256 | out_put: | |
e40526cb | 2257 | dev_put(dev); |
69e3c75f JB |
2258 | out: |
2259 | mutex_unlock(&po->pg_vec_lock); | |
2260 | return err; | |
2261 | } | |
69e3c75f | 2262 | |
eea49cc9 OJ |
2263 | static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad, |
2264 | size_t reserve, size_t len, | |
2265 | size_t linear, int noblock, | |
2266 | int *err) | |
bfd5f4a3 SS |
2267 | { |
2268 | struct sk_buff *skb; | |
2269 | ||
2270 | /* Under a page? Don't bother with paged skb. */ | |
2271 | if (prepad + len < PAGE_SIZE || !linear) | |
2272 | linear = len; | |
2273 | ||
2274 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, | |
28d64271 | 2275 | err, 0); |
bfd5f4a3 SS |
2276 | if (!skb) |
2277 | return NULL; | |
2278 | ||
2279 | skb_reserve(skb, reserve); | |
2280 | skb_put(skb, linear); | |
2281 | skb->data_len = len - linear; | |
2282 | skb->len += len - linear; | |
2283 | ||
2284 | return skb; | |
2285 | } | |
2286 | ||
d346a3fa | 2287 | static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len) |
1da177e4 LT |
2288 | { |
2289 | struct sock *sk = sock->sk; | |
40d4e3df | 2290 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
1da177e4 LT |
2291 | struct sk_buff *skb; |
2292 | struct net_device *dev; | |
0e11c91e | 2293 | __be16 proto; |
1da177e4 | 2294 | unsigned char *addr; |
827d9780 | 2295 | int err, reserve = 0; |
bfd5f4a3 SS |
2296 | struct virtio_net_hdr vnet_hdr = { 0 }; |
2297 | int offset = 0; | |
2298 | int vnet_hdr_len; | |
2299 | struct packet_sock *po = pkt_sk(sk); | |
2300 | unsigned short gso_type = 0; | |
ae641949 | 2301 | int hlen, tlen; |
3bdc0eba | 2302 | int extra_len = 0; |
1da177e4 LT |
2303 | |
2304 | /* | |
1ce4f28b | 2305 | * Get and verify the address. |
1da177e4 | 2306 | */ |
1ce4f28b | 2307 | |
66e56cd4 | 2308 | if (likely(saddr == NULL)) { |
e40526cb | 2309 | dev = packet_cached_dev_get(po); |
1da177e4 LT |
2310 | proto = po->num; |
2311 | addr = NULL; | |
2312 | } else { | |
2313 | err = -EINVAL; | |
2314 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
2315 | goto out; | |
0fb375fb EB |
2316 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
2317 | goto out; | |
1da177e4 LT |
2318 | proto = saddr->sll_protocol; |
2319 | addr = saddr->sll_addr; | |
827d9780 | 2320 | dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex); |
1da177e4 LT |
2321 | } |
2322 | ||
1da177e4 | 2323 | err = -ENXIO; |
e40526cb | 2324 | if (unlikely(dev == NULL)) |
1da177e4 | 2325 | goto out_unlock; |
d5e76b0a | 2326 | err = -ENETDOWN; |
e40526cb | 2327 | if (unlikely(!(dev->flags & IFF_UP))) |
d5e76b0a DM |
2328 | goto out_unlock; |
2329 | ||
e40526cb DB |
2330 | if (sock->type == SOCK_RAW) |
2331 | reserve = dev->hard_header_len; | |
bfd5f4a3 SS |
2332 | if (po->has_vnet_hdr) { |
2333 | vnet_hdr_len = sizeof(vnet_hdr); | |
2334 | ||
2335 | err = -EINVAL; | |
2336 | if (len < vnet_hdr_len) | |
2337 | goto out_unlock; | |
2338 | ||
2339 | len -= vnet_hdr_len; | |
2340 | ||
2341 | err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov, | |
2342 | vnet_hdr_len); | |
2343 | if (err < 0) | |
2344 | goto out_unlock; | |
2345 | ||
2346 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && | |
2347 | (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 > | |
2348 | vnet_hdr.hdr_len)) | |
2349 | vnet_hdr.hdr_len = vnet_hdr.csum_start + | |
2350 | vnet_hdr.csum_offset + 2; | |
2351 | ||
2352 | err = -EINVAL; | |
2353 | if (vnet_hdr.hdr_len > len) | |
2354 | goto out_unlock; | |
2355 | ||
2356 | if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
2357 | switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
2358 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
2359 | gso_type = SKB_GSO_TCPV4; | |
2360 | break; | |
2361 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
2362 | gso_type = SKB_GSO_TCPV6; | |
2363 | break; | |
2364 | case VIRTIO_NET_HDR_GSO_UDP: | |
2365 | gso_type = SKB_GSO_UDP; | |
2366 | break; | |
2367 | default: | |
2368 | goto out_unlock; | |
2369 | } | |
2370 | ||
2371 | if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
2372 | gso_type |= SKB_GSO_TCP_ECN; | |
2373 | ||
2374 | if (vnet_hdr.gso_size == 0) | |
2375 | goto out_unlock; | |
2376 | ||
2377 | } | |
2378 | } | |
2379 | ||
3bdc0eba BG |
2380 | if (unlikely(sock_flag(sk, SOCK_NOFCS))) { |
2381 | if (!netif_supports_nofcs(dev)) { | |
2382 | err = -EPROTONOSUPPORT; | |
2383 | goto out_unlock; | |
2384 | } | |
2385 | extra_len = 4; /* We're doing our own CRC */ | |
2386 | } | |
2387 | ||
1da177e4 | 2388 | err = -EMSGSIZE; |
3bdc0eba | 2389 | if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN + extra_len)) |
1da177e4 LT |
2390 | goto out_unlock; |
2391 | ||
bfd5f4a3 | 2392 | err = -ENOBUFS; |
ae641949 HX |
2393 | hlen = LL_RESERVED_SPACE(dev); |
2394 | tlen = dev->needed_tailroom; | |
2395 | skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, vnet_hdr.hdr_len, | |
bfd5f4a3 | 2396 | msg->msg_flags & MSG_DONTWAIT, &err); |
40d4e3df | 2397 | if (skb == NULL) |
1da177e4 LT |
2398 | goto out_unlock; |
2399 | ||
bfd5f4a3 | 2400 | skb_set_network_header(skb, reserve); |
1da177e4 | 2401 | |
0c4e8581 SH |
2402 | err = -EINVAL; |
2403 | if (sock->type == SOCK_DGRAM && | |
bfd5f4a3 | 2404 | (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0) |
0c4e8581 | 2405 | goto out_free; |
1da177e4 LT |
2406 | |
2407 | /* Returns -EFAULT on error */ | |
bfd5f4a3 | 2408 | err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len); |
1da177e4 LT |
2409 | if (err) |
2410 | goto out_free; | |
bf84a010 DB |
2411 | |
2412 | sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); | |
1da177e4 | 2413 | |
3bdc0eba | 2414 | if (!gso_type && (len > dev->mtu + reserve + extra_len)) { |
09effa67 DM |
2415 | /* Earlier code assumed this would be a VLAN pkt, |
2416 | * double-check this now that we have the actual | |
2417 | * packet in hand. | |
2418 | */ | |
2419 | struct ethhdr *ehdr; | |
2420 | skb_reset_mac_header(skb); | |
2421 | ehdr = eth_hdr(skb); | |
2422 | if (ehdr->h_proto != htons(ETH_P_8021Q)) { | |
2423 | err = -EMSGSIZE; | |
2424 | goto out_free; | |
2425 | } | |
57f89bfa BG |
2426 | } |
2427 | ||
09effa67 DM |
2428 | skb->protocol = proto; |
2429 | skb->dev = dev; | |
1da177e4 | 2430 | skb->priority = sk->sk_priority; |
2d37a186 | 2431 | skb->mark = sk->sk_mark; |
d346a3fa | 2432 | skb_set_queue_mapping(skb, packet_pick_tx_queue(dev)); |
1da177e4 | 2433 | |
bfd5f4a3 SS |
2434 | if (po->has_vnet_hdr) { |
2435 | if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
2436 | if (!skb_partial_csum_set(skb, vnet_hdr.csum_start, | |
2437 | vnet_hdr.csum_offset)) { | |
2438 | err = -EINVAL; | |
2439 | goto out_free; | |
2440 | } | |
2441 | } | |
2442 | ||
2443 | skb_shinfo(skb)->gso_size = vnet_hdr.gso_size; | |
2444 | skb_shinfo(skb)->gso_type = gso_type; | |
2445 | ||
2446 | /* Header must be checked, and gso_segs computed. */ | |
2447 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
2448 | skb_shinfo(skb)->gso_segs = 0; | |
2449 | ||
2450 | len += vnet_hdr_len; | |
2451 | } | |
2452 | ||
d346a3fa DB |
2453 | if (!packet_use_direct_xmit(po)) |
2454 | skb_probe_transport_header(skb, reserve); | |
3bdc0eba BG |
2455 | if (unlikely(extra_len == 4)) |
2456 | skb->no_fcs = 1; | |
2457 | ||
d346a3fa | 2458 | err = po->xmit(skb); |
1da177e4 LT |
2459 | if (err > 0 && (err = net_xmit_errno(err)) != 0) |
2460 | goto out_unlock; | |
2461 | ||
e40526cb | 2462 | dev_put(dev); |
1da177e4 | 2463 | |
40d4e3df | 2464 | return len; |
1da177e4 LT |
2465 | |
2466 | out_free: | |
2467 | kfree_skb(skb); | |
2468 | out_unlock: | |
e40526cb | 2469 | if (dev) |
1da177e4 LT |
2470 | dev_put(dev); |
2471 | out: | |
2472 | return err; | |
2473 | } | |
2474 | ||
69e3c75f JB |
2475 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
2476 | struct msghdr *msg, size_t len) | |
2477 | { | |
69e3c75f JB |
2478 | struct sock *sk = sock->sk; |
2479 | struct packet_sock *po = pkt_sk(sk); | |
d346a3fa | 2480 | |
69e3c75f JB |
2481 | if (po->tx_ring.pg_vec) |
2482 | return tpacket_snd(po, msg); | |
2483 | else | |
69e3c75f JB |
2484 | return packet_snd(sock, msg, len); |
2485 | } | |
2486 | ||
1da177e4 LT |
2487 | /* |
2488 | * Close a PACKET socket. This is fairly simple. We immediately go | |
2489 | * to 'closed' state and remove our protocol entry in the device list. | |
2490 | */ | |
2491 | ||
2492 | static int packet_release(struct socket *sock) | |
2493 | { | |
2494 | struct sock *sk = sock->sk; | |
2495 | struct packet_sock *po; | |
d12d01d6 | 2496 | struct net *net; |
f6fb8f10 | 2497 | union tpacket_req_u req_u; |
1da177e4 LT |
2498 | |
2499 | if (!sk) | |
2500 | return 0; | |
2501 | ||
3b1e0a65 | 2502 | net = sock_net(sk); |
1da177e4 LT |
2503 | po = pkt_sk(sk); |
2504 | ||
0fa7fa98 | 2505 | mutex_lock(&net->packet.sklist_lock); |
808f5114 | 2506 | sk_del_node_init_rcu(sk); |
0fa7fa98 PE |
2507 | mutex_unlock(&net->packet.sklist_lock); |
2508 | ||
2509 | preempt_disable(); | |
920de804 | 2510 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
0fa7fa98 | 2511 | preempt_enable(); |
1da177e4 | 2512 | |
808f5114 | 2513 | spin_lock(&po->bind_lock); |
ce06b03e | 2514 | unregister_prot_hook(sk, false); |
66e56cd4 DB |
2515 | packet_cached_dev_reset(po); |
2516 | ||
160ff18a BG |
2517 | if (po->prot_hook.dev) { |
2518 | dev_put(po->prot_hook.dev); | |
2519 | po->prot_hook.dev = NULL; | |
2520 | } | |
808f5114 | 2521 | spin_unlock(&po->bind_lock); |
1da177e4 | 2522 | |
1da177e4 | 2523 | packet_flush_mclist(sk); |
1da177e4 | 2524 | |
9665d5d6 PS |
2525 | if (po->rx_ring.pg_vec) { |
2526 | memset(&req_u, 0, sizeof(req_u)); | |
f6fb8f10 | 2527 | packet_set_ring(sk, &req_u, 1, 0); |
9665d5d6 | 2528 | } |
69e3c75f | 2529 | |
9665d5d6 PS |
2530 | if (po->tx_ring.pg_vec) { |
2531 | memset(&req_u, 0, sizeof(req_u)); | |
f6fb8f10 | 2532 | packet_set_ring(sk, &req_u, 1, 1); |
9665d5d6 | 2533 | } |
1da177e4 | 2534 | |
dc99f600 DM |
2535 | fanout_release(sk); |
2536 | ||
808f5114 | 2537 | synchronize_net(); |
1da177e4 LT |
2538 | /* |
2539 | * Now the socket is dead. No more input will appear. | |
2540 | */ | |
1da177e4 LT |
2541 | sock_orphan(sk); |
2542 | sock->sk = NULL; | |
2543 | ||
2544 | /* Purge queues */ | |
2545 | ||
2546 | skb_queue_purge(&sk->sk_receive_queue); | |
17ab56a2 | 2547 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
2548 | |
2549 | sock_put(sk); | |
2550 | return 0; | |
2551 | } | |
2552 | ||
2553 | /* | |
2554 | * Attach a packet hook. | |
2555 | */ | |
2556 | ||
0e11c91e | 2557 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
1da177e4 LT |
2558 | { |
2559 | struct packet_sock *po = pkt_sk(sk); | |
dc99f600 | 2560 | |
aef950b4 WY |
2561 | if (po->fanout) { |
2562 | if (dev) | |
2563 | dev_put(dev); | |
2564 | ||
dc99f600 | 2565 | return -EINVAL; |
aef950b4 | 2566 | } |
1da177e4 LT |
2567 | |
2568 | lock_sock(sk); | |
2569 | ||
2570 | spin_lock(&po->bind_lock); | |
ce06b03e | 2571 | unregister_prot_hook(sk, true); |
66e56cd4 | 2572 | |
1da177e4 LT |
2573 | po->num = protocol; |
2574 | po->prot_hook.type = protocol; | |
160ff18a BG |
2575 | if (po->prot_hook.dev) |
2576 | dev_put(po->prot_hook.dev); | |
1da177e4 | 2577 | |
66e56cd4 | 2578 | po->prot_hook.dev = dev; |
1da177e4 LT |
2579 | po->ifindex = dev ? dev->ifindex : 0; |
2580 | ||
66e56cd4 DB |
2581 | packet_cached_dev_assign(po, dev); |
2582 | ||
1da177e4 LT |
2583 | if (protocol == 0) |
2584 | goto out_unlock; | |
2585 | ||
be85d4ad | 2586 | if (!dev || (dev->flags & IFF_UP)) { |
ce06b03e | 2587 | register_prot_hook(sk); |
be85d4ad UT |
2588 | } else { |
2589 | sk->sk_err = ENETDOWN; | |
2590 | if (!sock_flag(sk, SOCK_DEAD)) | |
2591 | sk->sk_error_report(sk); | |
1da177e4 LT |
2592 | } |
2593 | ||
2594 | out_unlock: | |
2595 | spin_unlock(&po->bind_lock); | |
2596 | release_sock(sk); | |
2597 | return 0; | |
2598 | } | |
2599 | ||
2600 | /* | |
2601 | * Bind a packet socket to a device | |
2602 | */ | |
2603 | ||
40d4e3df ED |
2604 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
2605 | int addr_len) | |
1da177e4 | 2606 | { |
40d4e3df | 2607 | struct sock *sk = sock->sk; |
1da177e4 LT |
2608 | char name[15]; |
2609 | struct net_device *dev; | |
2610 | int err = -ENODEV; | |
1ce4f28b | 2611 | |
1da177e4 LT |
2612 | /* |
2613 | * Check legality | |
2614 | */ | |
1ce4f28b | 2615 | |
8ae55f04 | 2616 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 | 2617 | return -EINVAL; |
40d4e3df | 2618 | strlcpy(name, uaddr->sa_data, sizeof(name)); |
1da177e4 | 2619 | |
3b1e0a65 | 2620 | dev = dev_get_by_name(sock_net(sk), name); |
160ff18a | 2621 | if (dev) |
1da177e4 | 2622 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); |
1da177e4 LT |
2623 | return err; |
2624 | } | |
1da177e4 LT |
2625 | |
2626 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
2627 | { | |
40d4e3df ED |
2628 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
2629 | struct sock *sk = sock->sk; | |
1da177e4 LT |
2630 | struct net_device *dev = NULL; |
2631 | int err; | |
2632 | ||
2633 | ||
2634 | /* | |
2635 | * Check legality | |
2636 | */ | |
1ce4f28b | 2637 | |
1da177e4 LT |
2638 | if (addr_len < sizeof(struct sockaddr_ll)) |
2639 | return -EINVAL; | |
2640 | if (sll->sll_family != AF_PACKET) | |
2641 | return -EINVAL; | |
2642 | ||
2643 | if (sll->sll_ifindex) { | |
2644 | err = -ENODEV; | |
3b1e0a65 | 2645 | dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex); |
1da177e4 LT |
2646 | if (dev == NULL) |
2647 | goto out; | |
2648 | } | |
2649 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
1da177e4 LT |
2650 | |
2651 | out: | |
2652 | return err; | |
2653 | } | |
2654 | ||
2655 | static struct proto packet_proto = { | |
2656 | .name = "PACKET", | |
2657 | .owner = THIS_MODULE, | |
2658 | .obj_size = sizeof(struct packet_sock), | |
2659 | }; | |
2660 | ||
2661 | /* | |
1ce4f28b | 2662 | * Create a packet of type SOCK_PACKET. |
1da177e4 LT |
2663 | */ |
2664 | ||
3f378b68 EP |
2665 | static int packet_create(struct net *net, struct socket *sock, int protocol, |
2666 | int kern) | |
1da177e4 LT |
2667 | { |
2668 | struct sock *sk; | |
2669 | struct packet_sock *po; | |
0e11c91e | 2670 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1da177e4 LT |
2671 | int err; |
2672 | ||
df008c91 | 2673 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
1da177e4 | 2674 | return -EPERM; |
be02097c DM |
2675 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
2676 | sock->type != SOCK_PACKET) | |
1da177e4 LT |
2677 | return -ESOCKTNOSUPPORT; |
2678 | ||
2679 | sock->state = SS_UNCONNECTED; | |
2680 | ||
2681 | err = -ENOBUFS; | |
6257ff21 | 2682 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto); |
1da177e4 LT |
2683 | if (sk == NULL) |
2684 | goto out; | |
2685 | ||
2686 | sock->ops = &packet_ops; | |
1da177e4 LT |
2687 | if (sock->type == SOCK_PACKET) |
2688 | sock->ops = &packet_ops_spkt; | |
be02097c | 2689 | |
1da177e4 LT |
2690 | sock_init_data(sock, sk); |
2691 | ||
2692 | po = pkt_sk(sk); | |
2693 | sk->sk_family = PF_PACKET; | |
0e11c91e | 2694 | po->num = proto; |
d346a3fa | 2695 | po->xmit = dev_queue_xmit; |
66e56cd4 DB |
2696 | |
2697 | packet_cached_dev_reset(po); | |
1da177e4 LT |
2698 | |
2699 | sk->sk_destruct = packet_sock_destruct; | |
17ab56a2 | 2700 | sk_refcnt_debug_inc(sk); |
1da177e4 LT |
2701 | |
2702 | /* | |
2703 | * Attach a protocol block | |
2704 | */ | |
2705 | ||
2706 | spin_lock_init(&po->bind_lock); | |
905db440 | 2707 | mutex_init(&po->pg_vec_lock); |
1da177e4 | 2708 | po->prot_hook.func = packet_rcv; |
be02097c | 2709 | |
1da177e4 LT |
2710 | if (sock->type == SOCK_PACKET) |
2711 | po->prot_hook.func = packet_rcv_spkt; | |
be02097c | 2712 | |
1da177e4 LT |
2713 | po->prot_hook.af_packet_priv = sk; |
2714 | ||
0e11c91e AV |
2715 | if (proto) { |
2716 | po->prot_hook.type = proto; | |
ce06b03e | 2717 | register_prot_hook(sk); |
1da177e4 LT |
2718 | } |
2719 | ||
0fa7fa98 | 2720 | mutex_lock(&net->packet.sklist_lock); |
808f5114 | 2721 | sk_add_node_rcu(sk, &net->packet.sklist); |
0fa7fa98 PE |
2722 | mutex_unlock(&net->packet.sklist_lock); |
2723 | ||
2724 | preempt_disable(); | |
3680453c | 2725 | sock_prot_inuse_add(net, &packet_proto, 1); |
0fa7fa98 | 2726 | preempt_enable(); |
808f5114 | 2727 | |
40d4e3df | 2728 | return 0; |
1da177e4 LT |
2729 | out: |
2730 | return err; | |
2731 | } | |
2732 | ||
2733 | /* | |
2734 | * Pull a packet from our receive queue and hand it to the user. | |
2735 | * If necessary we block. | |
2736 | */ | |
2737 | ||
2738 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
2739 | struct msghdr *msg, size_t len, int flags) | |
2740 | { | |
2741 | struct sock *sk = sock->sk; | |
2742 | struct sk_buff *skb; | |
2743 | int copied, err; | |
bfd5f4a3 | 2744 | int vnet_hdr_len = 0; |
1da177e4 LT |
2745 | |
2746 | err = -EINVAL; | |
ed85b565 | 2747 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE)) |
1da177e4 LT |
2748 | goto out; |
2749 | ||
2750 | #if 0 | |
2751 | /* What error should we return now? EUNATTACH? */ | |
2752 | if (pkt_sk(sk)->ifindex < 0) | |
2753 | return -ENODEV; | |
2754 | #endif | |
2755 | ||
ed85b565 | 2756 | if (flags & MSG_ERRQUEUE) { |
cb820f8e RC |
2757 | err = sock_recv_errqueue(sk, msg, len, |
2758 | SOL_PACKET, PACKET_TX_TIMESTAMP); | |
ed85b565 RC |
2759 | goto out; |
2760 | } | |
2761 | ||
1da177e4 LT |
2762 | /* |
2763 | * Call the generic datagram receiver. This handles all sorts | |
2764 | * of horrible races and re-entrancy so we can forget about it | |
2765 | * in the protocol layers. | |
2766 | * | |
2767 | * Now it will return ENETDOWN, if device have just gone down, | |
2768 | * but then it will block. | |
2769 | */ | |
2770 | ||
40d4e3df | 2771 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
1da177e4 LT |
2772 | |
2773 | /* | |
1ce4f28b | 2774 | * An error occurred so return it. Because skb_recv_datagram() |
1da177e4 LT |
2775 | * handles the blocking we don't see and worry about blocking |
2776 | * retries. | |
2777 | */ | |
2778 | ||
8ae55f04 | 2779 | if (skb == NULL) |
1da177e4 LT |
2780 | goto out; |
2781 | ||
bfd5f4a3 SS |
2782 | if (pkt_sk(sk)->has_vnet_hdr) { |
2783 | struct virtio_net_hdr vnet_hdr = { 0 }; | |
2784 | ||
2785 | err = -EINVAL; | |
2786 | vnet_hdr_len = sizeof(vnet_hdr); | |
1f18b717 | 2787 | if (len < vnet_hdr_len) |
bfd5f4a3 SS |
2788 | goto out_free; |
2789 | ||
1f18b717 MK |
2790 | len -= vnet_hdr_len; |
2791 | ||
bfd5f4a3 SS |
2792 | if (skb_is_gso(skb)) { |
2793 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
2794 | ||
2795 | /* This is a hint as to how much should be linear. */ | |
2796 | vnet_hdr.hdr_len = skb_headlen(skb); | |
2797 | vnet_hdr.gso_size = sinfo->gso_size; | |
2798 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
2799 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
2800 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
2801 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
2802 | else if (sinfo->gso_type & SKB_GSO_UDP) | |
2803 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
2804 | else if (sinfo->gso_type & SKB_GSO_FCOE) | |
2805 | goto out_free; | |
2806 | else | |
2807 | BUG(); | |
2808 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
2809 | vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
2810 | } else | |
2811 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
2812 | ||
2813 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
2814 | vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
55508d60 | 2815 | vnet_hdr.csum_start = skb_checksum_start_offset(skb); |
bfd5f4a3 | 2816 | vnet_hdr.csum_offset = skb->csum_offset; |
10a8d94a JW |
2817 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
2818 | vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
bfd5f4a3 SS |
2819 | } /* else everything is zero */ |
2820 | ||
2821 | err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr, | |
2822 | vnet_hdr_len); | |
2823 | if (err < 0) | |
2824 | goto out_free; | |
2825 | } | |
2826 | ||
f3d33426 HFS |
2827 | /* You lose any data beyond the buffer you gave. If it worries |
2828 | * a user program they can ask the device for its MTU | |
2829 | * anyway. | |
1da177e4 | 2830 | */ |
1da177e4 | 2831 | copied = skb->len; |
40d4e3df ED |
2832 | if (copied > len) { |
2833 | copied = len; | |
2834 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 LT |
2835 | } |
2836 | ||
2837 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
2838 | if (err) | |
2839 | goto out_free; | |
2840 | ||
3b885787 | 2841 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 | 2842 | |
f3d33426 HFS |
2843 | if (msg->msg_name) { |
2844 | /* If the address length field is there to be filled | |
2845 | * in, we fill it in now. | |
2846 | */ | |
2847 | if (sock->type == SOCK_PACKET) { | |
2848 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
2849 | } else { | |
2850 | struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll; | |
2851 | msg->msg_namelen = sll->sll_halen + | |
2852 | offsetof(struct sockaddr_ll, sll_addr); | |
2853 | } | |
ffbc6111 HX |
2854 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
2855 | msg->msg_namelen); | |
f3d33426 | 2856 | } |
1da177e4 | 2857 | |
8dc41944 | 2858 | if (pkt_sk(sk)->auxdata) { |
ffbc6111 HX |
2859 | struct tpacket_auxdata aux; |
2860 | ||
2861 | aux.tp_status = TP_STATUS_USER; | |
2862 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
2863 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; | |
2864 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; | |
2865 | aux.tp_snaplen = skb->len; | |
2866 | aux.tp_mac = 0; | |
bbe735e4 | 2867 | aux.tp_net = skb_network_offset(skb); |
a3bcc23e BG |
2868 | if (vlan_tx_tag_present(skb)) { |
2869 | aux.tp_vlan_tci = vlan_tx_tag_get(skb); | |
2870 | aux.tp_status |= TP_STATUS_VLAN_VALID; | |
2871 | } else { | |
2872 | aux.tp_vlan_tci = 0; | |
2873 | } | |
13fcb7bd | 2874 | aux.tp_padding = 0; |
ffbc6111 | 2875 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); |
8dc41944 HX |
2876 | } |
2877 | ||
1da177e4 LT |
2878 | /* |
2879 | * Free or return the buffer as appropriate. Again this | |
2880 | * hides all the races and re-entrancy issues from us. | |
2881 | */ | |
bfd5f4a3 | 2882 | err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied); |
1da177e4 LT |
2883 | |
2884 | out_free: | |
2885 | skb_free_datagram(sk, skb); | |
2886 | out: | |
2887 | return err; | |
2888 | } | |
2889 | ||
1da177e4 LT |
2890 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
2891 | int *uaddr_len, int peer) | |
2892 | { | |
2893 | struct net_device *dev; | |
2894 | struct sock *sk = sock->sk; | |
2895 | ||
2896 | if (peer) | |
2897 | return -EOPNOTSUPP; | |
2898 | ||
2899 | uaddr->sa_family = AF_PACKET; | |
2dc85bf3 | 2900 | memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data)); |
654d1f8a ED |
2901 | rcu_read_lock(); |
2902 | dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); | |
2903 | if (dev) | |
2dc85bf3 | 2904 | strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data)); |
654d1f8a | 2905 | rcu_read_unlock(); |
1da177e4 LT |
2906 | *uaddr_len = sizeof(*uaddr); |
2907 | ||
2908 | return 0; | |
2909 | } | |
1da177e4 LT |
2910 | |
2911 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
2912 | int *uaddr_len, int peer) | |
2913 | { | |
2914 | struct net_device *dev; | |
2915 | struct sock *sk = sock->sk; | |
2916 | struct packet_sock *po = pkt_sk(sk); | |
13cfa97b | 2917 | DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr); |
1da177e4 LT |
2918 | |
2919 | if (peer) | |
2920 | return -EOPNOTSUPP; | |
2921 | ||
2922 | sll->sll_family = AF_PACKET; | |
2923 | sll->sll_ifindex = po->ifindex; | |
2924 | sll->sll_protocol = po->num; | |
67286640 | 2925 | sll->sll_pkttype = 0; |
654d1f8a ED |
2926 | rcu_read_lock(); |
2927 | dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex); | |
1da177e4 LT |
2928 | if (dev) { |
2929 | sll->sll_hatype = dev->type; | |
2930 | sll->sll_halen = dev->addr_len; | |
2931 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1da177e4 LT |
2932 | } else { |
2933 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
2934 | sll->sll_halen = 0; | |
2935 | } | |
654d1f8a | 2936 | rcu_read_unlock(); |
0fb375fb | 2937 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
2938 | |
2939 | return 0; | |
2940 | } | |
2941 | ||
2aeb0b88 WC |
2942 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
2943 | int what) | |
1da177e4 LT |
2944 | { |
2945 | switch (i->type) { | |
2946 | case PACKET_MR_MULTICAST: | |
1162563f JP |
2947 | if (i->alen != dev->addr_len) |
2948 | return -EINVAL; | |
1da177e4 | 2949 | if (what > 0) |
22bedad3 | 2950 | return dev_mc_add(dev, i->addr); |
1da177e4 | 2951 | else |
22bedad3 | 2952 | return dev_mc_del(dev, i->addr); |
1da177e4 LT |
2953 | break; |
2954 | case PACKET_MR_PROMISC: | |
2aeb0b88 | 2955 | return dev_set_promiscuity(dev, what); |
1da177e4 LT |
2956 | break; |
2957 | case PACKET_MR_ALLMULTI: | |
2aeb0b88 | 2958 | return dev_set_allmulti(dev, what); |
1da177e4 | 2959 | break; |
d95ed927 | 2960 | case PACKET_MR_UNICAST: |
1162563f JP |
2961 | if (i->alen != dev->addr_len) |
2962 | return -EINVAL; | |
d95ed927 | 2963 | if (what > 0) |
a748ee24 | 2964 | return dev_uc_add(dev, i->addr); |
d95ed927 | 2965 | else |
a748ee24 | 2966 | return dev_uc_del(dev, i->addr); |
d95ed927 | 2967 | break; |
40d4e3df ED |
2968 | default: |
2969 | break; | |
1da177e4 | 2970 | } |
2aeb0b88 | 2971 | return 0; |
1da177e4 LT |
2972 | } |
2973 | ||
2974 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
2975 | { | |
40d4e3df | 2976 | for ( ; i; i = i->next) { |
1da177e4 LT |
2977 | if (i->ifindex == dev->ifindex) |
2978 | packet_dev_mc(dev, i, what); | |
2979 | } | |
2980 | } | |
2981 | ||
0fb375fb | 2982 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
2983 | { |
2984 | struct packet_sock *po = pkt_sk(sk); | |
2985 | struct packet_mclist *ml, *i; | |
2986 | struct net_device *dev; | |
2987 | int err; | |
2988 | ||
2989 | rtnl_lock(); | |
2990 | ||
2991 | err = -ENODEV; | |
3b1e0a65 | 2992 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
1da177e4 LT |
2993 | if (!dev) |
2994 | goto done; | |
2995 | ||
2996 | err = -EINVAL; | |
1162563f | 2997 | if (mreq->mr_alen > dev->addr_len) |
1da177e4 LT |
2998 | goto done; |
2999 | ||
3000 | err = -ENOBUFS; | |
8b3a7005 | 3001 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
3002 | if (i == NULL) |
3003 | goto done; | |
3004 | ||
3005 | err = 0; | |
3006 | for (ml = po->mclist; ml; ml = ml->next) { | |
3007 | if (ml->ifindex == mreq->mr_ifindex && | |
3008 | ml->type == mreq->mr_type && | |
3009 | ml->alen == mreq->mr_alen && | |
3010 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
3011 | ml->count++; | |
3012 | /* Free the new element ... */ | |
3013 | kfree(i); | |
3014 | goto done; | |
3015 | } | |
3016 | } | |
3017 | ||
3018 | i->type = mreq->mr_type; | |
3019 | i->ifindex = mreq->mr_ifindex; | |
3020 | i->alen = mreq->mr_alen; | |
3021 | memcpy(i->addr, mreq->mr_address, i->alen); | |
3022 | i->count = 1; | |
3023 | i->next = po->mclist; | |
3024 | po->mclist = i; | |
2aeb0b88 WC |
3025 | err = packet_dev_mc(dev, i, 1); |
3026 | if (err) { | |
3027 | po->mclist = i->next; | |
3028 | kfree(i); | |
3029 | } | |
1da177e4 LT |
3030 | |
3031 | done: | |
3032 | rtnl_unlock(); | |
3033 | return err; | |
3034 | } | |
3035 | ||
0fb375fb | 3036 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
3037 | { |
3038 | struct packet_mclist *ml, **mlp; | |
3039 | ||
3040 | rtnl_lock(); | |
3041 | ||
3042 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
3043 | if (ml->ifindex == mreq->mr_ifindex && | |
3044 | ml->type == mreq->mr_type && | |
3045 | ml->alen == mreq->mr_alen && | |
3046 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
3047 | if (--ml->count == 0) { | |
3048 | struct net_device *dev; | |
3049 | *mlp = ml->next; | |
ad959e76 ED |
3050 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
3051 | if (dev) | |
1da177e4 | 3052 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
3053 | kfree(ml); |
3054 | } | |
3055 | rtnl_unlock(); | |
3056 | return 0; | |
3057 | } | |
3058 | } | |
3059 | rtnl_unlock(); | |
3060 | return -EADDRNOTAVAIL; | |
3061 | } | |
3062 | ||
3063 | static void packet_flush_mclist(struct sock *sk) | |
3064 | { | |
3065 | struct packet_sock *po = pkt_sk(sk); | |
3066 | struct packet_mclist *ml; | |
3067 | ||
3068 | if (!po->mclist) | |
3069 | return; | |
3070 | ||
3071 | rtnl_lock(); | |
3072 | while ((ml = po->mclist) != NULL) { | |
3073 | struct net_device *dev; | |
3074 | ||
3075 | po->mclist = ml->next; | |
ad959e76 ED |
3076 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
3077 | if (dev != NULL) | |
1da177e4 | 3078 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
3079 | kfree(ml); |
3080 | } | |
3081 | rtnl_unlock(); | |
3082 | } | |
1da177e4 LT |
3083 | |
3084 | static int | |
b7058842 | 3085 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
3086 | { |
3087 | struct sock *sk = sock->sk; | |
8dc41944 | 3088 | struct packet_sock *po = pkt_sk(sk); |
1da177e4 LT |
3089 | int ret; |
3090 | ||
3091 | if (level != SOL_PACKET) | |
3092 | return -ENOPROTOOPT; | |
3093 | ||
69e3c75f | 3094 | switch (optname) { |
1ce4f28b | 3095 | case PACKET_ADD_MEMBERSHIP: |
1da177e4 LT |
3096 | case PACKET_DROP_MEMBERSHIP: |
3097 | { | |
0fb375fb EB |
3098 | struct packet_mreq_max mreq; |
3099 | int len = optlen; | |
3100 | memset(&mreq, 0, sizeof(mreq)); | |
3101 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 3102 | return -EINVAL; |
0fb375fb EB |
3103 | if (len > sizeof(mreq)) |
3104 | len = sizeof(mreq); | |
40d4e3df | 3105 | if (copy_from_user(&mreq, optval, len)) |
1da177e4 | 3106 | return -EFAULT; |
0fb375fb EB |
3107 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
3108 | return -EINVAL; | |
1da177e4 LT |
3109 | if (optname == PACKET_ADD_MEMBERSHIP) |
3110 | ret = packet_mc_add(sk, &mreq); | |
3111 | else | |
3112 | ret = packet_mc_drop(sk, &mreq); | |
3113 | return ret; | |
3114 | } | |
a2efcfa0 | 3115 | |
1da177e4 | 3116 | case PACKET_RX_RING: |
69e3c75f | 3117 | case PACKET_TX_RING: |
1da177e4 | 3118 | { |
f6fb8f10 | 3119 | union tpacket_req_u req_u; |
3120 | int len; | |
1da177e4 | 3121 | |
f6fb8f10 | 3122 | switch (po->tp_version) { |
3123 | case TPACKET_V1: | |
3124 | case TPACKET_V2: | |
3125 | len = sizeof(req_u.req); | |
3126 | break; | |
3127 | case TPACKET_V3: | |
3128 | default: | |
3129 | len = sizeof(req_u.req3); | |
3130 | break; | |
3131 | } | |
3132 | if (optlen < len) | |
1da177e4 | 3133 | return -EINVAL; |
bfd5f4a3 SS |
3134 | if (pkt_sk(sk)->has_vnet_hdr) |
3135 | return -EINVAL; | |
f6fb8f10 | 3136 | if (copy_from_user(&req_u.req, optval, len)) |
1da177e4 | 3137 | return -EFAULT; |
f6fb8f10 | 3138 | return packet_set_ring(sk, &req_u, 0, |
3139 | optname == PACKET_TX_RING); | |
1da177e4 LT |
3140 | } |
3141 | case PACKET_COPY_THRESH: | |
3142 | { | |
3143 | int val; | |
3144 | ||
40d4e3df | 3145 | if (optlen != sizeof(val)) |
1da177e4 | 3146 | return -EINVAL; |
40d4e3df | 3147 | if (copy_from_user(&val, optval, sizeof(val))) |
1da177e4 LT |
3148 | return -EFAULT; |
3149 | ||
3150 | pkt_sk(sk)->copy_thresh = val; | |
3151 | return 0; | |
3152 | } | |
bbd6ef87 PM |
3153 | case PACKET_VERSION: |
3154 | { | |
3155 | int val; | |
3156 | ||
3157 | if (optlen != sizeof(val)) | |
3158 | return -EINVAL; | |
69e3c75f | 3159 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
bbd6ef87 PM |
3160 | return -EBUSY; |
3161 | if (copy_from_user(&val, optval, sizeof(val))) | |
3162 | return -EFAULT; | |
3163 | switch (val) { | |
3164 | case TPACKET_V1: | |
3165 | case TPACKET_V2: | |
f6fb8f10 | 3166 | case TPACKET_V3: |
bbd6ef87 PM |
3167 | po->tp_version = val; |
3168 | return 0; | |
3169 | default: | |
3170 | return -EINVAL; | |
3171 | } | |
3172 | } | |
8913336a PM |
3173 | case PACKET_RESERVE: |
3174 | { | |
3175 | unsigned int val; | |
3176 | ||
3177 | if (optlen != sizeof(val)) | |
3178 | return -EINVAL; | |
69e3c75f | 3179 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
8913336a PM |
3180 | return -EBUSY; |
3181 | if (copy_from_user(&val, optval, sizeof(val))) | |
3182 | return -EFAULT; | |
3183 | po->tp_reserve = val; | |
3184 | return 0; | |
3185 | } | |
69e3c75f JB |
3186 | case PACKET_LOSS: |
3187 | { | |
3188 | unsigned int val; | |
3189 | ||
3190 | if (optlen != sizeof(val)) | |
3191 | return -EINVAL; | |
3192 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
3193 | return -EBUSY; | |
3194 | if (copy_from_user(&val, optval, sizeof(val))) | |
3195 | return -EFAULT; | |
3196 | po->tp_loss = !!val; | |
3197 | return 0; | |
3198 | } | |
8dc41944 HX |
3199 | case PACKET_AUXDATA: |
3200 | { | |
3201 | int val; | |
3202 | ||
3203 | if (optlen < sizeof(val)) | |
3204 | return -EINVAL; | |
3205 | if (copy_from_user(&val, optval, sizeof(val))) | |
3206 | return -EFAULT; | |
3207 | ||
3208 | po->auxdata = !!val; | |
3209 | return 0; | |
3210 | } | |
80feaacb PWJ |
3211 | case PACKET_ORIGDEV: |
3212 | { | |
3213 | int val; | |
3214 | ||
3215 | if (optlen < sizeof(val)) | |
3216 | return -EINVAL; | |
3217 | if (copy_from_user(&val, optval, sizeof(val))) | |
3218 | return -EFAULT; | |
3219 | ||
3220 | po->origdev = !!val; | |
3221 | return 0; | |
3222 | } | |
bfd5f4a3 SS |
3223 | case PACKET_VNET_HDR: |
3224 | { | |
3225 | int val; | |
3226 | ||
3227 | if (sock->type != SOCK_RAW) | |
3228 | return -EINVAL; | |
3229 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
3230 | return -EBUSY; | |
3231 | if (optlen < sizeof(val)) | |
3232 | return -EINVAL; | |
3233 | if (copy_from_user(&val, optval, sizeof(val))) | |
3234 | return -EFAULT; | |
3235 | ||
3236 | po->has_vnet_hdr = !!val; | |
3237 | return 0; | |
3238 | } | |
614f60fa SM |
3239 | case PACKET_TIMESTAMP: |
3240 | { | |
3241 | int val; | |
3242 | ||
3243 | if (optlen != sizeof(val)) | |
3244 | return -EINVAL; | |
3245 | if (copy_from_user(&val, optval, sizeof(val))) | |
3246 | return -EFAULT; | |
3247 | ||
3248 | po->tp_tstamp = val; | |
3249 | return 0; | |
3250 | } | |
dc99f600 DM |
3251 | case PACKET_FANOUT: |
3252 | { | |
3253 | int val; | |
3254 | ||
3255 | if (optlen != sizeof(val)) | |
3256 | return -EINVAL; | |
3257 | if (copy_from_user(&val, optval, sizeof(val))) | |
3258 | return -EFAULT; | |
3259 | ||
3260 | return fanout_add(sk, val & 0xffff, val >> 16); | |
3261 | } | |
5920cd3a PC |
3262 | case PACKET_TX_HAS_OFF: |
3263 | { | |
3264 | unsigned int val; | |
3265 | ||
3266 | if (optlen != sizeof(val)) | |
3267 | return -EINVAL; | |
3268 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
3269 | return -EBUSY; | |
3270 | if (copy_from_user(&val, optval, sizeof(val))) | |
3271 | return -EFAULT; | |
3272 | po->tp_tx_has_off = !!val; | |
3273 | return 0; | |
3274 | } | |
d346a3fa DB |
3275 | case PACKET_QDISC_BYPASS: |
3276 | { | |
3277 | int val; | |
3278 | ||
3279 | if (optlen != sizeof(val)) | |
3280 | return -EINVAL; | |
3281 | if (copy_from_user(&val, optval, sizeof(val))) | |
3282 | return -EFAULT; | |
3283 | ||
3284 | po->xmit = val ? packet_direct_xmit : dev_queue_xmit; | |
3285 | return 0; | |
3286 | } | |
1da177e4 LT |
3287 | default: |
3288 | return -ENOPROTOOPT; | |
3289 | } | |
3290 | } | |
3291 | ||
3292 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
3293 | char __user *optval, int __user *optlen) | |
3294 | { | |
3295 | int len; | |
c06fff6e | 3296 | int val, lv = sizeof(val); |
1da177e4 LT |
3297 | struct sock *sk = sock->sk; |
3298 | struct packet_sock *po = pkt_sk(sk); | |
c06fff6e | 3299 | void *data = &val; |
ee80fbf3 | 3300 | union tpacket_stats_u st; |
1da177e4 LT |
3301 | |
3302 | if (level != SOL_PACKET) | |
3303 | return -ENOPROTOOPT; | |
3304 | ||
8ae55f04 KK |
3305 | if (get_user(len, optlen)) |
3306 | return -EFAULT; | |
1da177e4 LT |
3307 | |
3308 | if (len < 0) | |
3309 | return -EINVAL; | |
1ce4f28b | 3310 | |
69e3c75f | 3311 | switch (optname) { |
1da177e4 | 3312 | case PACKET_STATISTICS: |
1da177e4 | 3313 | spin_lock_bh(&sk->sk_receive_queue.lock); |
ee80fbf3 DB |
3314 | memcpy(&st, &po->stats, sizeof(st)); |
3315 | memset(&po->stats, 0, sizeof(po->stats)); | |
3316 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
3317 | ||
f6fb8f10 | 3318 | if (po->tp_version == TPACKET_V3) { |
c06fff6e | 3319 | lv = sizeof(struct tpacket_stats_v3); |
8bcdeaff | 3320 | st.stats3.tp_packets += st.stats3.tp_drops; |
ee80fbf3 | 3321 | data = &st.stats3; |
f6fb8f10 | 3322 | } else { |
c06fff6e | 3323 | lv = sizeof(struct tpacket_stats); |
8bcdeaff | 3324 | st.stats1.tp_packets += st.stats1.tp_drops; |
ee80fbf3 | 3325 | data = &st.stats1; |
f6fb8f10 | 3326 | } |
ee80fbf3 | 3327 | |
8dc41944 HX |
3328 | break; |
3329 | case PACKET_AUXDATA: | |
8dc41944 | 3330 | val = po->auxdata; |
80feaacb PWJ |
3331 | break; |
3332 | case PACKET_ORIGDEV: | |
80feaacb | 3333 | val = po->origdev; |
bfd5f4a3 SS |
3334 | break; |
3335 | case PACKET_VNET_HDR: | |
bfd5f4a3 | 3336 | val = po->has_vnet_hdr; |
1da177e4 | 3337 | break; |
bbd6ef87 | 3338 | case PACKET_VERSION: |
bbd6ef87 | 3339 | val = po->tp_version; |
bbd6ef87 PM |
3340 | break; |
3341 | case PACKET_HDRLEN: | |
3342 | if (len > sizeof(int)) | |
3343 | len = sizeof(int); | |
3344 | if (copy_from_user(&val, optval, len)) | |
3345 | return -EFAULT; | |
3346 | switch (val) { | |
3347 | case TPACKET_V1: | |
3348 | val = sizeof(struct tpacket_hdr); | |
3349 | break; | |
3350 | case TPACKET_V2: | |
3351 | val = sizeof(struct tpacket2_hdr); | |
3352 | break; | |
f6fb8f10 | 3353 | case TPACKET_V3: |
3354 | val = sizeof(struct tpacket3_hdr); | |
3355 | break; | |
bbd6ef87 PM |
3356 | default: |
3357 | return -EINVAL; | |
3358 | } | |
bbd6ef87 | 3359 | break; |
8913336a | 3360 | case PACKET_RESERVE: |
8913336a | 3361 | val = po->tp_reserve; |
8913336a | 3362 | break; |
69e3c75f | 3363 | case PACKET_LOSS: |
69e3c75f | 3364 | val = po->tp_loss; |
69e3c75f | 3365 | break; |
614f60fa | 3366 | case PACKET_TIMESTAMP: |
614f60fa | 3367 | val = po->tp_tstamp; |
614f60fa | 3368 | break; |
dc99f600 | 3369 | case PACKET_FANOUT: |
dc99f600 DM |
3370 | val = (po->fanout ? |
3371 | ((u32)po->fanout->id | | |
77f65ebd WB |
3372 | ((u32)po->fanout->type << 16) | |
3373 | ((u32)po->fanout->flags << 24)) : | |
dc99f600 | 3374 | 0); |
dc99f600 | 3375 | break; |
5920cd3a PC |
3376 | case PACKET_TX_HAS_OFF: |
3377 | val = po->tp_tx_has_off; | |
3378 | break; | |
d346a3fa DB |
3379 | case PACKET_QDISC_BYPASS: |
3380 | val = packet_use_direct_xmit(po); | |
3381 | break; | |
1da177e4 LT |
3382 | default: |
3383 | return -ENOPROTOOPT; | |
3384 | } | |
3385 | ||
c06fff6e ED |
3386 | if (len > lv) |
3387 | len = lv; | |
8ae55f04 KK |
3388 | if (put_user(len, optlen)) |
3389 | return -EFAULT; | |
8dc41944 HX |
3390 | if (copy_to_user(optval, data, len)) |
3391 | return -EFAULT; | |
8ae55f04 | 3392 | return 0; |
1da177e4 LT |
3393 | } |
3394 | ||
3395 | ||
351638e7 JP |
3396 | static int packet_notifier(struct notifier_block *this, |
3397 | unsigned long msg, void *ptr) | |
1da177e4 LT |
3398 | { |
3399 | struct sock *sk; | |
351638e7 | 3400 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 3401 | struct net *net = dev_net(dev); |
1da177e4 | 3402 | |
808f5114 | 3403 | rcu_read_lock(); |
b67bfe0d | 3404 | sk_for_each_rcu(sk, &net->packet.sklist) { |
1da177e4 LT |
3405 | struct packet_sock *po = pkt_sk(sk); |
3406 | ||
3407 | switch (msg) { | |
3408 | case NETDEV_UNREGISTER: | |
1da177e4 LT |
3409 | if (po->mclist) |
3410 | packet_dev_mclist(dev, po->mclist, -1); | |
a2efcfa0 DM |
3411 | /* fallthrough */ |
3412 | ||
1da177e4 LT |
3413 | case NETDEV_DOWN: |
3414 | if (dev->ifindex == po->ifindex) { | |
3415 | spin_lock(&po->bind_lock); | |
3416 | if (po->running) { | |
ce06b03e | 3417 | __unregister_prot_hook(sk, false); |
1da177e4 LT |
3418 | sk->sk_err = ENETDOWN; |
3419 | if (!sock_flag(sk, SOCK_DEAD)) | |
3420 | sk->sk_error_report(sk); | |
3421 | } | |
3422 | if (msg == NETDEV_UNREGISTER) { | |
66e56cd4 | 3423 | packet_cached_dev_reset(po); |
1da177e4 | 3424 | po->ifindex = -1; |
160ff18a BG |
3425 | if (po->prot_hook.dev) |
3426 | dev_put(po->prot_hook.dev); | |
1da177e4 LT |
3427 | po->prot_hook.dev = NULL; |
3428 | } | |
3429 | spin_unlock(&po->bind_lock); | |
3430 | } | |
3431 | break; | |
3432 | case NETDEV_UP: | |
808f5114 | 3433 | if (dev->ifindex == po->ifindex) { |
3434 | spin_lock(&po->bind_lock); | |
ce06b03e DM |
3435 | if (po->num) |
3436 | register_prot_hook(sk); | |
808f5114 | 3437 | spin_unlock(&po->bind_lock); |
1da177e4 | 3438 | } |
1da177e4 LT |
3439 | break; |
3440 | } | |
3441 | } | |
808f5114 | 3442 | rcu_read_unlock(); |
1da177e4 LT |
3443 | return NOTIFY_DONE; |
3444 | } | |
3445 | ||
3446 | ||
3447 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
3448 | unsigned long arg) | |
3449 | { | |
3450 | struct sock *sk = sock->sk; | |
3451 | ||
69e3c75f | 3452 | switch (cmd) { |
40d4e3df ED |
3453 | case SIOCOUTQ: |
3454 | { | |
3455 | int amount = sk_wmem_alloc_get(sk); | |
31e6d363 | 3456 | |
40d4e3df ED |
3457 | return put_user(amount, (int __user *)arg); |
3458 | } | |
3459 | case SIOCINQ: | |
3460 | { | |
3461 | struct sk_buff *skb; | |
3462 | int amount = 0; | |
3463 | ||
3464 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
3465 | skb = skb_peek(&sk->sk_receive_queue); | |
3466 | if (skb) | |
3467 | amount = skb->len; | |
3468 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
3469 | return put_user(amount, (int __user *)arg); | |
3470 | } | |
3471 | case SIOCGSTAMP: | |
3472 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
3473 | case SIOCGSTAMPNS: | |
3474 | return sock_get_timestampns(sk, (struct timespec __user *)arg); | |
1ce4f28b | 3475 | |
1da177e4 | 3476 | #ifdef CONFIG_INET |
40d4e3df ED |
3477 | case SIOCADDRT: |
3478 | case SIOCDELRT: | |
3479 | case SIOCDARP: | |
3480 | case SIOCGARP: | |
3481 | case SIOCSARP: | |
3482 | case SIOCGIFADDR: | |
3483 | case SIOCSIFADDR: | |
3484 | case SIOCGIFBRDADDR: | |
3485 | case SIOCSIFBRDADDR: | |
3486 | case SIOCGIFNETMASK: | |
3487 | case SIOCSIFNETMASK: | |
3488 | case SIOCGIFDSTADDR: | |
3489 | case SIOCSIFDSTADDR: | |
3490 | case SIOCSIFFLAGS: | |
40d4e3df | 3491 | return inet_dgram_ops.ioctl(sock, cmd, arg); |
1da177e4 LT |
3492 | #endif |
3493 | ||
40d4e3df ED |
3494 | default: |
3495 | return -ENOIOCTLCMD; | |
1da177e4 LT |
3496 | } |
3497 | return 0; | |
3498 | } | |
3499 | ||
40d4e3df | 3500 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
1da177e4 LT |
3501 | poll_table *wait) |
3502 | { | |
3503 | struct sock *sk = sock->sk; | |
3504 | struct packet_sock *po = pkt_sk(sk); | |
3505 | unsigned int mask = datagram_poll(file, sock, wait); | |
3506 | ||
3507 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f | 3508 | if (po->rx_ring.pg_vec) { |
f6fb8f10 | 3509 | if (!packet_previous_rx_frame(po, &po->rx_ring, |
3510 | TP_STATUS_KERNEL)) | |
1da177e4 LT |
3511 | mask |= POLLIN | POLLRDNORM; |
3512 | } | |
3513 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
3514 | spin_lock_bh(&sk->sk_write_queue.lock); |
3515 | if (po->tx_ring.pg_vec) { | |
3516 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) | |
3517 | mask |= POLLOUT | POLLWRNORM; | |
3518 | } | |
3519 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
1da177e4 LT |
3520 | return mask; |
3521 | } | |
3522 | ||
3523 | ||
3524 | /* Dirty? Well, I still did not learn better way to account | |
3525 | * for user mmaps. | |
3526 | */ | |
3527 | ||
3528 | static void packet_mm_open(struct vm_area_struct *vma) | |
3529 | { | |
3530 | struct file *file = vma->vm_file; | |
40d4e3df | 3531 | struct socket *sock = file->private_data; |
1da177e4 | 3532 | struct sock *sk = sock->sk; |
1ce4f28b | 3533 | |
1da177e4 LT |
3534 | if (sk) |
3535 | atomic_inc(&pkt_sk(sk)->mapped); | |
3536 | } | |
3537 | ||
3538 | static void packet_mm_close(struct vm_area_struct *vma) | |
3539 | { | |
3540 | struct file *file = vma->vm_file; | |
40d4e3df | 3541 | struct socket *sock = file->private_data; |
1da177e4 | 3542 | struct sock *sk = sock->sk; |
1ce4f28b | 3543 | |
1da177e4 LT |
3544 | if (sk) |
3545 | atomic_dec(&pkt_sk(sk)->mapped); | |
3546 | } | |
3547 | ||
f0f37e2f | 3548 | static const struct vm_operations_struct packet_mmap_ops = { |
40d4e3df ED |
3549 | .open = packet_mm_open, |
3550 | .close = packet_mm_close, | |
1da177e4 LT |
3551 | }; |
3552 | ||
0e3125c7 NH |
3553 | static void free_pg_vec(struct pgv *pg_vec, unsigned int order, |
3554 | unsigned int len) | |
1da177e4 LT |
3555 | { |
3556 | int i; | |
3557 | ||
4ebf0ae2 | 3558 | for (i = 0; i < len; i++) { |
0e3125c7 | 3559 | if (likely(pg_vec[i].buffer)) { |
c56b4d90 | 3560 | if (is_vmalloc_addr(pg_vec[i].buffer)) |
0e3125c7 NH |
3561 | vfree(pg_vec[i].buffer); |
3562 | else | |
3563 | free_pages((unsigned long)pg_vec[i].buffer, | |
3564 | order); | |
3565 | pg_vec[i].buffer = NULL; | |
3566 | } | |
1da177e4 LT |
3567 | } |
3568 | kfree(pg_vec); | |
3569 | } | |
3570 | ||
eea49cc9 | 3571 | static char *alloc_one_pg_vec_page(unsigned long order) |
4ebf0ae2 | 3572 | { |
0e3125c7 NH |
3573 | char *buffer = NULL; |
3574 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | | |
3575 | __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY; | |
3576 | ||
3577 | buffer = (char *) __get_free_pages(gfp_flags, order); | |
3578 | ||
3579 | if (buffer) | |
3580 | return buffer; | |
3581 | ||
3582 | /* | |
3583 | * __get_free_pages failed, fall back to vmalloc | |
3584 | */ | |
bbce5a59 | 3585 | buffer = vzalloc((1 << order) * PAGE_SIZE); |
719bfeaa | 3586 | |
0e3125c7 NH |
3587 | if (buffer) |
3588 | return buffer; | |
3589 | ||
3590 | /* | |
3591 | * vmalloc failed, lets dig into swap here | |
3592 | */ | |
0e3125c7 NH |
3593 | gfp_flags &= ~__GFP_NORETRY; |
3594 | buffer = (char *)__get_free_pages(gfp_flags, order); | |
3595 | if (buffer) | |
3596 | return buffer; | |
3597 | ||
3598 | /* | |
3599 | * complete and utter failure | |
3600 | */ | |
3601 | return NULL; | |
4ebf0ae2 DM |
3602 | } |
3603 | ||
0e3125c7 | 3604 | static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order) |
4ebf0ae2 DM |
3605 | { |
3606 | unsigned int block_nr = req->tp_block_nr; | |
0e3125c7 | 3607 | struct pgv *pg_vec; |
4ebf0ae2 DM |
3608 | int i; |
3609 | ||
0e3125c7 | 3610 | pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL); |
4ebf0ae2 DM |
3611 | if (unlikely(!pg_vec)) |
3612 | goto out; | |
3613 | ||
3614 | for (i = 0; i < block_nr; i++) { | |
c56b4d90 | 3615 | pg_vec[i].buffer = alloc_one_pg_vec_page(order); |
0e3125c7 | 3616 | if (unlikely(!pg_vec[i].buffer)) |
4ebf0ae2 DM |
3617 | goto out_free_pgvec; |
3618 | } | |
3619 | ||
3620 | out: | |
3621 | return pg_vec; | |
3622 | ||
3623 | out_free_pgvec: | |
3624 | free_pg_vec(pg_vec, order, block_nr); | |
3625 | pg_vec = NULL; | |
3626 | goto out; | |
3627 | } | |
1da177e4 | 3628 | |
f6fb8f10 | 3629 | static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u, |
69e3c75f | 3630 | int closing, int tx_ring) |
1da177e4 | 3631 | { |
0e3125c7 | 3632 | struct pgv *pg_vec = NULL; |
1da177e4 | 3633 | struct packet_sock *po = pkt_sk(sk); |
0e11c91e | 3634 | int was_running, order = 0; |
69e3c75f JB |
3635 | struct packet_ring_buffer *rb; |
3636 | struct sk_buff_head *rb_queue; | |
0e11c91e | 3637 | __be16 num; |
f6fb8f10 | 3638 | int err = -EINVAL; |
3639 | /* Added to avoid minimal code churn */ | |
3640 | struct tpacket_req *req = &req_u->req; | |
3641 | ||
3642 | /* Opening a Tx-ring is NOT supported in TPACKET_V3 */ | |
3643 | if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) { | |
3644 | WARN(1, "Tx-ring is not supported.\n"); | |
3645 | goto out; | |
3646 | } | |
1ce4f28b | 3647 | |
69e3c75f JB |
3648 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
3649 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; | |
1da177e4 | 3650 | |
69e3c75f JB |
3651 | err = -EBUSY; |
3652 | if (!closing) { | |
3653 | if (atomic_read(&po->mapped)) | |
3654 | goto out; | |
3655 | if (atomic_read(&rb->pending)) | |
3656 | goto out; | |
3657 | } | |
1da177e4 | 3658 | |
69e3c75f JB |
3659 | if (req->tp_block_nr) { |
3660 | /* Sanity tests and some calculations */ | |
3661 | err = -EBUSY; | |
3662 | if (unlikely(rb->pg_vec)) | |
3663 | goto out; | |
1da177e4 | 3664 | |
bbd6ef87 PM |
3665 | switch (po->tp_version) { |
3666 | case TPACKET_V1: | |
3667 | po->tp_hdrlen = TPACKET_HDRLEN; | |
3668 | break; | |
3669 | case TPACKET_V2: | |
3670 | po->tp_hdrlen = TPACKET2_HDRLEN; | |
3671 | break; | |
f6fb8f10 | 3672 | case TPACKET_V3: |
3673 | po->tp_hdrlen = TPACKET3_HDRLEN; | |
3674 | break; | |
bbd6ef87 PM |
3675 | } |
3676 | ||
69e3c75f | 3677 | err = -EINVAL; |
4ebf0ae2 | 3678 | if (unlikely((int)req->tp_block_size <= 0)) |
69e3c75f | 3679 | goto out; |
4ebf0ae2 | 3680 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
69e3c75f | 3681 | goto out; |
8913336a | 3682 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
69e3c75f JB |
3683 | po->tp_reserve)) |
3684 | goto out; | |
4ebf0ae2 | 3685 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
69e3c75f | 3686 | goto out; |
1da177e4 | 3687 | |
69e3c75f JB |
3688 | rb->frames_per_block = req->tp_block_size/req->tp_frame_size; |
3689 | if (unlikely(rb->frames_per_block <= 0)) | |
3690 | goto out; | |
3691 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != | |
3692 | req->tp_frame_nr)) | |
3693 | goto out; | |
1da177e4 LT |
3694 | |
3695 | err = -ENOMEM; | |
4ebf0ae2 DM |
3696 | order = get_order(req->tp_block_size); |
3697 | pg_vec = alloc_pg_vec(req, order); | |
3698 | if (unlikely(!pg_vec)) | |
1da177e4 | 3699 | goto out; |
f6fb8f10 | 3700 | switch (po->tp_version) { |
3701 | case TPACKET_V3: | |
3702 | /* Transmit path is not supported. We checked | |
3703 | * it above but just being paranoid | |
3704 | */ | |
3705 | if (!tx_ring) | |
3706 | init_prb_bdqc(po, rb, pg_vec, req_u, tx_ring); | |
3707 | break; | |
3708 | default: | |
3709 | break; | |
3710 | } | |
69e3c75f JB |
3711 | } |
3712 | /* Done */ | |
3713 | else { | |
3714 | err = -EINVAL; | |
4ebf0ae2 | 3715 | if (unlikely(req->tp_frame_nr)) |
69e3c75f | 3716 | goto out; |
1da177e4 LT |
3717 | } |
3718 | ||
3719 | lock_sock(sk); | |
3720 | ||
3721 | /* Detach socket from network */ | |
3722 | spin_lock(&po->bind_lock); | |
3723 | was_running = po->running; | |
3724 | num = po->num; | |
3725 | if (was_running) { | |
1da177e4 | 3726 | po->num = 0; |
ce06b03e | 3727 | __unregister_prot_hook(sk, false); |
1da177e4 LT |
3728 | } |
3729 | spin_unlock(&po->bind_lock); | |
1ce4f28b | 3730 | |
1da177e4 LT |
3731 | synchronize_net(); |
3732 | ||
3733 | err = -EBUSY; | |
905db440 | 3734 | mutex_lock(&po->pg_vec_lock); |
1da177e4 LT |
3735 | if (closing || atomic_read(&po->mapped) == 0) { |
3736 | err = 0; | |
69e3c75f | 3737 | spin_lock_bh(&rb_queue->lock); |
c053fd96 | 3738 | swap(rb->pg_vec, pg_vec); |
69e3c75f JB |
3739 | rb->frame_max = (req->tp_frame_nr - 1); |
3740 | rb->head = 0; | |
3741 | rb->frame_size = req->tp_frame_size; | |
3742 | spin_unlock_bh(&rb_queue->lock); | |
3743 | ||
c053fd96 CG |
3744 | swap(rb->pg_vec_order, order); |
3745 | swap(rb->pg_vec_len, req->tp_block_nr); | |
69e3c75f JB |
3746 | |
3747 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
3748 | po->prot_hook.func = (po->rx_ring.pg_vec) ? | |
3749 | tpacket_rcv : packet_rcv; | |
3750 | skb_queue_purge(rb_queue); | |
1da177e4 | 3751 | if (atomic_read(&po->mapped)) |
40d4e3df ED |
3752 | pr_err("packet_mmap: vma is busy: %d\n", |
3753 | atomic_read(&po->mapped)); | |
1da177e4 | 3754 | } |
905db440 | 3755 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
3756 | |
3757 | spin_lock(&po->bind_lock); | |
ce06b03e | 3758 | if (was_running) { |
1da177e4 | 3759 | po->num = num; |
ce06b03e | 3760 | register_prot_hook(sk); |
1da177e4 LT |
3761 | } |
3762 | spin_unlock(&po->bind_lock); | |
f6fb8f10 | 3763 | if (closing && (po->tp_version > TPACKET_V2)) { |
3764 | /* Because we don't support block-based V3 on tx-ring */ | |
3765 | if (!tx_ring) | |
3766 | prb_shutdown_retire_blk_timer(po, tx_ring, rb_queue); | |
3767 | } | |
1da177e4 LT |
3768 | release_sock(sk); |
3769 | ||
1da177e4 LT |
3770 | if (pg_vec) |
3771 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
3772 | out: | |
3773 | return err; | |
3774 | } | |
3775 | ||
69e3c75f JB |
3776 | static int packet_mmap(struct file *file, struct socket *sock, |
3777 | struct vm_area_struct *vma) | |
1da177e4 LT |
3778 | { |
3779 | struct sock *sk = sock->sk; | |
3780 | struct packet_sock *po = pkt_sk(sk); | |
69e3c75f JB |
3781 | unsigned long size, expected_size; |
3782 | struct packet_ring_buffer *rb; | |
1da177e4 LT |
3783 | unsigned long start; |
3784 | int err = -EINVAL; | |
3785 | int i; | |
3786 | ||
3787 | if (vma->vm_pgoff) | |
3788 | return -EINVAL; | |
3789 | ||
905db440 | 3790 | mutex_lock(&po->pg_vec_lock); |
69e3c75f JB |
3791 | |
3792 | expected_size = 0; | |
3793 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { | |
3794 | if (rb->pg_vec) { | |
3795 | expected_size += rb->pg_vec_len | |
3796 | * rb->pg_vec_pages | |
3797 | * PAGE_SIZE; | |
3798 | } | |
3799 | } | |
3800 | ||
3801 | if (expected_size == 0) | |
1da177e4 | 3802 | goto out; |
69e3c75f JB |
3803 | |
3804 | size = vma->vm_end - vma->vm_start; | |
3805 | if (size != expected_size) | |
1da177e4 LT |
3806 | goto out; |
3807 | ||
1da177e4 | 3808 | start = vma->vm_start; |
69e3c75f JB |
3809 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
3810 | if (rb->pg_vec == NULL) | |
3811 | continue; | |
3812 | ||
3813 | for (i = 0; i < rb->pg_vec_len; i++) { | |
0e3125c7 NH |
3814 | struct page *page; |
3815 | void *kaddr = rb->pg_vec[i].buffer; | |
69e3c75f JB |
3816 | int pg_num; |
3817 | ||
c56b4d90 CG |
3818 | for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) { |
3819 | page = pgv_to_page(kaddr); | |
69e3c75f JB |
3820 | err = vm_insert_page(vma, start, page); |
3821 | if (unlikely(err)) | |
3822 | goto out; | |
3823 | start += PAGE_SIZE; | |
0e3125c7 | 3824 | kaddr += PAGE_SIZE; |
69e3c75f | 3825 | } |
4ebf0ae2 | 3826 | } |
1da177e4 | 3827 | } |
69e3c75f | 3828 | |
4ebf0ae2 | 3829 | atomic_inc(&po->mapped); |
1da177e4 LT |
3830 | vma->vm_ops = &packet_mmap_ops; |
3831 | err = 0; | |
3832 | ||
3833 | out: | |
905db440 | 3834 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
3835 | return err; |
3836 | } | |
1da177e4 | 3837 | |
90ddc4f0 | 3838 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
3839 | .family = PF_PACKET, |
3840 | .owner = THIS_MODULE, | |
3841 | .release = packet_release, | |
3842 | .bind = packet_bind_spkt, | |
3843 | .connect = sock_no_connect, | |
3844 | .socketpair = sock_no_socketpair, | |
3845 | .accept = sock_no_accept, | |
3846 | .getname = packet_getname_spkt, | |
3847 | .poll = datagram_poll, | |
3848 | .ioctl = packet_ioctl, | |
3849 | .listen = sock_no_listen, | |
3850 | .shutdown = sock_no_shutdown, | |
3851 | .setsockopt = sock_no_setsockopt, | |
3852 | .getsockopt = sock_no_getsockopt, | |
3853 | .sendmsg = packet_sendmsg_spkt, | |
3854 | .recvmsg = packet_recvmsg, | |
3855 | .mmap = sock_no_mmap, | |
3856 | .sendpage = sock_no_sendpage, | |
3857 | }; | |
1da177e4 | 3858 | |
90ddc4f0 | 3859 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
3860 | .family = PF_PACKET, |
3861 | .owner = THIS_MODULE, | |
3862 | .release = packet_release, | |
3863 | .bind = packet_bind, | |
3864 | .connect = sock_no_connect, | |
3865 | .socketpair = sock_no_socketpair, | |
3866 | .accept = sock_no_accept, | |
1ce4f28b | 3867 | .getname = packet_getname, |
1da177e4 LT |
3868 | .poll = packet_poll, |
3869 | .ioctl = packet_ioctl, | |
3870 | .listen = sock_no_listen, | |
3871 | .shutdown = sock_no_shutdown, | |
3872 | .setsockopt = packet_setsockopt, | |
3873 | .getsockopt = packet_getsockopt, | |
3874 | .sendmsg = packet_sendmsg, | |
3875 | .recvmsg = packet_recvmsg, | |
3876 | .mmap = packet_mmap, | |
3877 | .sendpage = sock_no_sendpage, | |
3878 | }; | |
3879 | ||
ec1b4cf7 | 3880 | static const struct net_proto_family packet_family_ops = { |
1da177e4 LT |
3881 | .family = PF_PACKET, |
3882 | .create = packet_create, | |
3883 | .owner = THIS_MODULE, | |
3884 | }; | |
3885 | ||
3886 | static struct notifier_block packet_netdev_notifier = { | |
40d4e3df | 3887 | .notifier_call = packet_notifier, |
1da177e4 LT |
3888 | }; |
3889 | ||
3890 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
3891 | |
3892 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
808f5114 | 3893 | __acquires(RCU) |
1da177e4 | 3894 | { |
e372c414 | 3895 | struct net *net = seq_file_net(seq); |
808f5114 | 3896 | |
3897 | rcu_read_lock(); | |
3898 | return seq_hlist_start_head_rcu(&net->packet.sklist, *pos); | |
1da177e4 LT |
3899 | } |
3900 | ||
3901 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3902 | { | |
1bf40954 | 3903 | struct net *net = seq_file_net(seq); |
808f5114 | 3904 | return seq_hlist_next_rcu(v, &net->packet.sklist, pos); |
1da177e4 LT |
3905 | } |
3906 | ||
3907 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
808f5114 | 3908 | __releases(RCU) |
1da177e4 | 3909 | { |
808f5114 | 3910 | rcu_read_unlock(); |
1da177e4 LT |
3911 | } |
3912 | ||
1ce4f28b | 3913 | static int packet_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
3914 | { |
3915 | if (v == SEQ_START_TOKEN) | |
3916 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
3917 | else { | |
b7ceabd9 | 3918 | struct sock *s = sk_entry(v); |
1da177e4 LT |
3919 | const struct packet_sock *po = pkt_sk(s); |
3920 | ||
3921 | seq_printf(seq, | |
71338aa7 | 3922 | "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", |
1da177e4 LT |
3923 | s, |
3924 | atomic_read(&s->sk_refcnt), | |
3925 | s->sk_type, | |
3926 | ntohs(po->num), | |
3927 | po->ifindex, | |
3928 | po->running, | |
3929 | atomic_read(&s->sk_rmem_alloc), | |
a7cb5a49 | 3930 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)), |
40d4e3df | 3931 | sock_i_ino(s)); |
1da177e4 LT |
3932 | } |
3933 | ||
3934 | return 0; | |
3935 | } | |
3936 | ||
56b3d975 | 3937 | static const struct seq_operations packet_seq_ops = { |
1da177e4 LT |
3938 | .start = packet_seq_start, |
3939 | .next = packet_seq_next, | |
3940 | .stop = packet_seq_stop, | |
3941 | .show = packet_seq_show, | |
3942 | }; | |
3943 | ||
3944 | static int packet_seq_open(struct inode *inode, struct file *file) | |
3945 | { | |
e372c414 DL |
3946 | return seq_open_net(inode, file, &packet_seq_ops, |
3947 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
3948 | } |
3949 | ||
da7071d7 | 3950 | static const struct file_operations packet_seq_fops = { |
1da177e4 LT |
3951 | .owner = THIS_MODULE, |
3952 | .open = packet_seq_open, | |
3953 | .read = seq_read, | |
3954 | .llseek = seq_lseek, | |
e372c414 | 3955 | .release = seq_release_net, |
1da177e4 LT |
3956 | }; |
3957 | ||
3958 | #endif | |
3959 | ||
2c8c1e72 | 3960 | static int __net_init packet_net_init(struct net *net) |
d12d01d6 | 3961 | { |
0fa7fa98 | 3962 | mutex_init(&net->packet.sklist_lock); |
2aaef4e4 | 3963 | INIT_HLIST_HEAD(&net->packet.sklist); |
d12d01d6 | 3964 | |
d4beaa66 | 3965 | if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops)) |
d12d01d6 DL |
3966 | return -ENOMEM; |
3967 | ||
3968 | return 0; | |
3969 | } | |
3970 | ||
2c8c1e72 | 3971 | static void __net_exit packet_net_exit(struct net *net) |
d12d01d6 | 3972 | { |
ece31ffd | 3973 | remove_proc_entry("packet", net->proc_net); |
d12d01d6 DL |
3974 | } |
3975 | ||
3976 | static struct pernet_operations packet_net_ops = { | |
3977 | .init = packet_net_init, | |
3978 | .exit = packet_net_exit, | |
3979 | }; | |
3980 | ||
3981 | ||
1da177e4 LT |
3982 | static void __exit packet_exit(void) |
3983 | { | |
1da177e4 | 3984 | unregister_netdevice_notifier(&packet_netdev_notifier); |
d12d01d6 | 3985 | unregister_pernet_subsys(&packet_net_ops); |
1da177e4 LT |
3986 | sock_unregister(PF_PACKET); |
3987 | proto_unregister(&packet_proto); | |
3988 | } | |
3989 | ||
3990 | static int __init packet_init(void) | |
3991 | { | |
3992 | int rc = proto_register(&packet_proto, 0); | |
3993 | ||
3994 | if (rc != 0) | |
3995 | goto out; | |
3996 | ||
3997 | sock_register(&packet_family_ops); | |
d12d01d6 | 3998 | register_pernet_subsys(&packet_net_ops); |
1da177e4 | 3999 | register_netdevice_notifier(&packet_netdev_notifier); |
1da177e4 LT |
4000 | out: |
4001 | return rc; | |
4002 | } | |
4003 | ||
4004 | module_init(packet_init); | |
4005 | module_exit(packet_exit); | |
4006 | MODULE_LICENSE("GPL"); | |
4007 | MODULE_ALIAS_NETPROTO(PF_PACKET); |