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sock: support per-packet fwmark
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1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * PACKET - implements raw packet sockets.
7 *
02c30a84 8 * Authors: Ross Biro
1da177e4
LT		 9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Alan Cox, <gw4pts@gw4pts.ampr.org>
11 *
1ce4f28b 12 * Fixes:
1da177e4
LT		 13 * Alan Cox : verify_area() now used correctly
14 * Alan Cox : new skbuff lists, look ma no backlogs!
15 * Alan Cox : tidied skbuff lists.
16 * Alan Cox : Now uses generic datagram routines I
17 * added. Also fixed the peek/read crash
18 * from all old Linux datagram code.
19 * Alan Cox : Uses the improved datagram code.
20 * Alan Cox : Added NULL's for socket options.
21 * Alan Cox : Re-commented the code.
22 * Alan Cox : Use new kernel side addressing
23 * Rob Janssen : Correct MTU usage.
24 * Dave Platt : Counter leaks caused by incorrect
25 * interrupt locking and some slightly
26 * dubious gcc output. Can you read
27 * compiler: it said _VOLATILE_
28 * Richard Kooijman : Timestamp fixes.
29 * Alan Cox : New buffers. Use sk->mac.raw.
30 * Alan Cox : sendmsg/recvmsg support.
31 * Alan Cox : Protocol setting support
32 * Alexey Kuznetsov : Untied from IPv4 stack.
33 * Cyrus Durgin : Fixed kerneld for kmod.
34 * Michal Ostrowski : Module initialization cleanup.
1ce4f28b 35 * Ulises Alonso : Frame number limit removal and
1da177e4 36 * packet_set_ring memory leak.
0fb375fb
EB		 37 * Eric Biederman : Allow for > 8 byte hardware addresses.
38 * The convention is that longer addresses
39 * will simply extend the hardware address
1ce4f28b 40 * byte arrays at the end of sockaddr_ll
0fb375fb 41 * and packet_mreq.
69e3c75f 42 * Johann Baudy : Added TX RING.
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>
b0138408 91#include <linux/percpu.h>
1da177e4
LT		 92#ifdef CONFIG_INET
93#include <net/inet_common.h>
94#endif
47dceb8e 95#include <linux/bpf.h>
1da177e4 96
2787b04b
PE		 97#include "internal.h"
98
1da177e4
LT		 99/*
100 Assumptions:
101 - if device has no dev->hard_header routine, it adds and removes ll header
102 inside itself. In this case ll header is invisible outside of device,
103 but higher levels still should reserve dev->hard_header_len.
104 Some devices are enough clever to reallocate skb, when header
105 will not fit to reserved space (tunnel), another ones are silly
106 (PPP).
107 - packet socket receives packets with pulled ll header,
108 so that SOCK_RAW should push it back.
109
110On receive:
111-----------
112
113Incoming, dev->hard_header!=NULL
b0e380b1
ACM		 114 mac_header -> ll header
115 data -> data
1da177e4
LT		 116
117Outgoing, dev->hard_header!=NULL
b0e380b1
ACM		 118 mac_header -> ll header
119 data -> ll header
1da177e4
LT		 120
121Incoming, dev->hard_header==NULL
b0e380b1
ACM		 122 mac_header -> UNKNOWN position. It is very likely, that it points to ll
123 header. PPP makes it, that is wrong, because introduce
db0c58f9 124 assymetry between rx and tx paths.
b0e380b1 125 data -> data
1da177e4
LT		 126
127Outgoing, dev->hard_header==NULL
b0e380b1
ACM		 128 mac_header -> data. ll header is still not built!
129 data -> data
1da177e4
LT		 130
131Resume
132 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
133
134
135On transmit:
136------------
137
138dev->hard_header != NULL
b0e380b1
ACM		 139 mac_header -> ll header
140 data -> ll header
1da177e4
LT		 141
142dev->hard_header == NULL (ll header is added by device, we cannot control it)
b0e380b1
ACM		 143 mac_header -> data
144 data -> data
1da177e4
LT		 145
146 We should set nh.raw on output to correct posistion,
147 packet classifier depends on it.
148 */
149
1da177e4
LT		 150/* Private packet socket structures. */
151
0fb375fb
EB		 152/* identical to struct packet_mreq except it has
153 * a longer address field.
154 */
40d4e3df 155struct packet_mreq_max {
0fb375fb
EB		 156 int mr_ifindex;
157 unsigned short mr_type;
158 unsigned short mr_alen;
159 unsigned char mr_address[MAX_ADDR_LEN];
1da177e4 160};
a2efcfa0 161
184f489e
DB		 162union tpacket_uhdr {
163 struct tpacket_hdr *h1;
164 struct tpacket2_hdr *h2;
165 struct tpacket3_hdr *h3;
166 void *raw;
167};
168
f6fb8f10 169static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
69e3c75f
JB		 170 int closing, int tx_ring);
171
f6fb8f10 172#define V3_ALIGNMENT (8)
173
bc59ba39 174#define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT))
f6fb8f10 175
176#define BLK_PLUS_PRIV(sz_of_priv) \
177 (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT))
178
f6fb8f10 179#define PGV_FROM_VMALLOC 1
69e3c75f 180
f6fb8f10 181#define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status)
182#define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts)
183#define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt)
184#define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len)
185#define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num)
186#define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
187#define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x)))
188
69e3c75f
JB		 189struct packet_sock;
190static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
77f65ebd
WB		 191static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
192 struct packet_type *pt, struct net_device *orig_dev);
1da177e4 193
f6fb8f10 194static void *packet_previous_frame(struct packet_sock *po,
195 struct packet_ring_buffer *rb,
196 int status);
197static void packet_increment_head(struct packet_ring_buffer *buff);
bc59ba39 198static int prb_curr_blk_in_use(struct tpacket_kbdq_core *,
199 struct tpacket_block_desc *);
200static void *prb_dispatch_next_block(struct tpacket_kbdq_core *,
f6fb8f10 201 struct packet_sock *);
bc59ba39 202static void prb_retire_current_block(struct tpacket_kbdq_core *,
f6fb8f10 203 struct packet_sock *, unsigned int status);
bc59ba39 204static int prb_queue_frozen(struct tpacket_kbdq_core *);
205static void prb_open_block(struct tpacket_kbdq_core *,
206 struct tpacket_block_desc *);
f6fb8f10 207static void prb_retire_rx_blk_timer_expired(unsigned long);
bc59ba39 208static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *);
209static void prb_init_blk_timer(struct packet_sock *,
210 struct tpacket_kbdq_core *,
211 void (*func) (unsigned long));
212static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *);
213static void prb_clear_rxhash(struct tpacket_kbdq_core *,
214 struct tpacket3_hdr *);
215static void prb_fill_vlan_info(struct tpacket_kbdq_core *,
216 struct tpacket3_hdr *);
1da177e4
LT		 217static void packet_flush_mclist(struct sock *sk);
218
ffbc6111 219struct packet_skb_cb {
ffbc6111
HX		 220 union {
221 struct sockaddr_pkt pkt;
2472d761
EB		 222 union {
223 /* Trick: alias skb original length with
224 * ll.sll_family and ll.protocol in order
225 * to save room.
226 */
227 unsigned int origlen;
228 struct sockaddr_ll ll;
229 };
ffbc6111
HX		 230 } sa;
231};
232
d3869efe
DW		 233#define vio_le() virtio_legacy_is_little_endian()
234
ffbc6111 235#define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
8dc41944 236
bc59ba39 237#define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
f6fb8f10 238#define GET_PBLOCK_DESC(x, bid) \
bc59ba39 239 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
f6fb8f10 240#define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
bc59ba39 241 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
f6fb8f10 242#define GET_NEXT_PRB_BLK_NUM(x) \
243 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
244 ((x)->kactive_blk_num+1) : 0)
245
dc99f600
DM		 246static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
247static void __fanout_link(struct sock *sk, struct packet_sock *po);
248
d346a3fa
DB		 249static int packet_direct_xmit(struct sk_buff *skb)
250{
251 struct net_device *dev = skb->dev;
d346a3fa
DB		 252 netdev_features_t features;
253 struct netdev_queue *txq;
43279500 254 int ret = NETDEV_TX_BUSY;
d346a3fa
DB		 255
256 if (unlikely(!netif_running(dev) ||
43279500
DB		 257 !netif_carrier_ok(dev)))
258 goto drop;
d346a3fa
DB		 259
260 features = netif_skb_features(skb);
261 if (skb_needs_linearize(skb, features) &&
43279500
DB		 262 __skb_linearize(skb))
263 goto drop;
d346a3fa 264
10c51b56 265 txq = skb_get_tx_queue(dev, skb);
d346a3fa 266
43279500
DB		 267 local_bh_disable();
268
269 HARD_TX_LOCK(dev, txq, smp_processor_id());
10b3ad8c 270 if (!netif_xmit_frozen_or_drv_stopped(txq))
fa2dbdc2 271 ret = netdev_start_xmit(skb, dev, txq, false);
43279500 272 HARD_TX_UNLOCK(dev, txq);
d346a3fa 273
43279500
DB		 274 local_bh_enable();
275
276 if (!dev_xmit_complete(ret))
d346a3fa 277 kfree_skb(skb);
43279500 278
d346a3fa 279 return ret;
43279500 280drop:
0f97ede4 281 atomic_long_inc(&dev->tx_dropped);
43279500
DB		 282 kfree_skb(skb);
283 return NET_XMIT_DROP;
d346a3fa
DB		 284}
285
66e56cd4
DB		 286static struct net_device *packet_cached_dev_get(struct packet_sock *po)
287{
288 struct net_device *dev;
289
290 rcu_read_lock();
291 dev = rcu_dereference(po->cached_dev);
292 if (likely(dev))
293 dev_hold(dev);
294 rcu_read_unlock();
295
296 return dev;
297}
298
299static void packet_cached_dev_assign(struct packet_sock *po,
300 struct net_device *dev)
301{
302 rcu_assign_pointer(po->cached_dev, dev);
303}
304
305static void packet_cached_dev_reset(struct packet_sock *po)
306{
307 RCU_INIT_POINTER(po->cached_dev, NULL);
308}
309
d346a3fa
DB		 310static bool packet_use_direct_xmit(const struct packet_sock *po)
311{
312 return po->xmit == packet_direct_xmit;
313}
314
0fd5d57b 315static u16 __packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
d346a3fa 316{
1cbac010 317 return (u16) raw_smp_processor_id() % dev->real_num_tx_queues;
d346a3fa
DB		 318}
319
0fd5d57b
DB		 320static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
321{
322 const struct net_device_ops *ops = dev->netdev_ops;
323 u16 queue_index;
324
325 if (ops->ndo_select_queue) {
326 queue_index = ops->ndo_select_queue(dev, skb, NULL,
327 __packet_pick_tx_queue);
328 queue_index = netdev_cap_txqueue(dev, queue_index);
329 } else {
330 queue_index = __packet_pick_tx_queue(dev, skb);
331 }
332
333 skb_set_queue_mapping(skb, queue_index);
334}
335
ce06b03e
DM		 336/* register_prot_hook must be invoked with the po->bind_lock held,
337 * or from a context in which asynchronous accesses to the packet
338 * socket is not possible (packet_create()).
339 */
340static void register_prot_hook(struct sock *sk)
341{
342 struct packet_sock *po = pkt_sk(sk);
e40526cb 343
ce06b03e 344 if (!po->running) {
66e56cd4 345 if (po->fanout)
dc99f600 346 __fanout_link(sk, po);
66e56cd4 347 else
dc99f600 348 dev_add_pack(&po->prot_hook);
e40526cb 349
ce06b03e
DM		 350 sock_hold(sk);
351 po->running = 1;
352 }
353}
354
355/* {,__}unregister_prot_hook() must be invoked with the po->bind_lock
356 * held. If the sync parameter is true, we will temporarily drop
357 * the po->bind_lock and do a synchronize_net to make sure no
358 * asynchronous packet processing paths still refer to the elements
359 * of po->prot_hook. If the sync parameter is false, it is the
360 * callers responsibility to take care of this.
361 */
362static void __unregister_prot_hook(struct sock *sk, bool sync)
363{
364 struct packet_sock *po = pkt_sk(sk);
365
366 po->running = 0;
66e56cd4
DB		 367
368 if (po->fanout)
dc99f600 369 __fanout_unlink(sk, po);
66e56cd4 370 else
dc99f600 371 __dev_remove_pack(&po->prot_hook);
e40526cb 372
ce06b03e
DM		 373 __sock_put(sk);
374
375 if (sync) {
376 spin_unlock(&po->bind_lock);
377 synchronize_net();
378 spin_lock(&po->bind_lock);
379 }
380}
381
382static void unregister_prot_hook(struct sock *sk, bool sync)
383{
384 struct packet_sock *po = pkt_sk(sk);
385
386 if (po->running)
387 __unregister_prot_hook(sk, sync);
388}
389
6e58040b 390static inline struct page * __pure pgv_to_page(void *addr)
0af55bb5
CG		 391{
392 if (is_vmalloc_addr(addr))
393 return vmalloc_to_page(addr);
394 return virt_to_page(addr);
395}
396
69e3c75f 397static void __packet_set_status(struct packet_sock *po, void *frame, int status)
1da177e4 398{
184f489e 399 union tpacket_uhdr h;
1da177e4 400
69e3c75f 401 h.raw = frame;
bbd6ef87
PM		 402 switch (po->tp_version) {
403 case TPACKET_V1:
69e3c75f 404 h.h1->tp_status = status;
0af55bb5 405 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
bbd6ef87
PM		 406 break;
407 case TPACKET_V2:
69e3c75f 408 h.h2->tp_status = status;
0af55bb5 409 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
bbd6ef87 410 break;
f6fb8f10 411 case TPACKET_V3:
69e3c75f 412 default:
f6fb8f10 413 WARN(1, "TPACKET version not supported.\n");
69e3c75f 414 BUG();
bbd6ef87 415 }
69e3c75f
JB		 416
417 smp_wmb();
bbd6ef87
PM		 418}
419
69e3c75f 420static int __packet_get_status(struct packet_sock *po, void *frame)
bbd6ef87 421{
184f489e 422 union tpacket_uhdr h;
bbd6ef87 423
69e3c75f
JB		 424 smp_rmb();
425
bbd6ef87
PM		 426 h.raw = frame;
427 switch (po->tp_version) {
428 case TPACKET_V1:
0af55bb5 429 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
69e3c75f 430 return h.h1->tp_status;
bbd6ef87 431 case TPACKET_V2:
0af55bb5 432 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
69e3c75f 433 return h.h2->tp_status;
f6fb8f10 434 case TPACKET_V3:
69e3c75f 435 default:
f6fb8f10 436 WARN(1, "TPACKET version not supported.\n");
69e3c75f
JB		 437 BUG();
438 return 0;
bbd6ef87 439 }
1da177e4 440}
69e3c75f 441
b9c32fb2
DB		 442static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts,
443 unsigned int flags)
7a51384c
DB		 444{
445 struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
446
68a360e8
WB		 447 if (shhwtstamps &&
448 (flags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
449 ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts))
450 return TP_STATUS_TS_RAW_HARDWARE;
7a51384c
DB		 451
452 if (ktime_to_timespec_cond(skb->tstamp, ts))
b9c32fb2 453 return TP_STATUS_TS_SOFTWARE;
7a51384c 454
b9c32fb2 455 return 0;
7a51384c
DB		 456}
457
b9c32fb2
DB		 458static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame,
459 struct sk_buff *skb)
2e31396f
WB		 460{
461 union tpacket_uhdr h;
462 struct timespec ts;
b9c32fb2 463 __u32 ts_status;
2e31396f 464
b9c32fb2
DB		 465 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
466 return 0;
2e31396f
WB		 467
468 h.raw = frame;
469 switch (po->tp_version) {
470 case TPACKET_V1:
471 h.h1->tp_sec = ts.tv_sec;
472 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
473 break;
474 case TPACKET_V2:
475 h.h2->tp_sec = ts.tv_sec;
476 h.h2->tp_nsec = ts.tv_nsec;
477 break;
478 case TPACKET_V3:
479 default:
480 WARN(1, "TPACKET version not supported.\n");
481 BUG();
482 }
483
484 /* one flush is safe, as both fields always lie on the same cacheline */
485 flush_dcache_page(pgv_to_page(&h.h1->tp_sec));
486 smp_wmb();
b9c32fb2
DB		 487
488 return ts_status;
2e31396f
WB		 489}
490
69e3c75f
JB		 491static void *packet_lookup_frame(struct packet_sock *po,
492 struct packet_ring_buffer *rb,
493 unsigned int position,
494 int status)
495{
496 unsigned int pg_vec_pos, frame_offset;
184f489e 497 union tpacket_uhdr h;
69e3c75f
JB		 498
499 pg_vec_pos = position / rb->frames_per_block;
500 frame_offset = position % rb->frames_per_block;
501
0e3125c7
NH		 502 h.raw = rb->pg_vec[pg_vec_pos].buffer +
503 (frame_offset * rb->frame_size);
69e3c75f
JB		 504
505 if (status != __packet_get_status(po, h.raw))
506 return NULL;
507
508 return h.raw;
509}
510
eea49cc9 511static void *packet_current_frame(struct packet_sock *po,
69e3c75f
JB		 512 struct packet_ring_buffer *rb,
513 int status)
514{
515 return packet_lookup_frame(po, rb, rb->head, status);
516}
517
bc59ba39 518static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc)
f6fb8f10 519{
520 del_timer_sync(&pkc->retire_blk_timer);
521}
522
523static void prb_shutdown_retire_blk_timer(struct packet_sock *po,
f6fb8f10 524 struct sk_buff_head *rb_queue)
525{
bc59ba39 526 struct tpacket_kbdq_core *pkc;
f6fb8f10 527
73d0fcf2 528 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
f6fb8f10 529
ec6f809f 530 spin_lock_bh(&rb_queue->lock);
f6fb8f10 531 pkc->delete_blk_timer = 1;
ec6f809f 532 spin_unlock_bh(&rb_queue->lock);
f6fb8f10 533
534 prb_del_retire_blk_timer(pkc);
535}
536
537static void prb_init_blk_timer(struct packet_sock *po,
bc59ba39 538 struct tpacket_kbdq_core *pkc,
f6fb8f10 539 void (*func) (unsigned long))
540{
541 init_timer(&pkc->retire_blk_timer);
542 pkc->retire_blk_timer.data = (long)po;
543 pkc->retire_blk_timer.function = func;
544 pkc->retire_blk_timer.expires = jiffies;
545}
546
e8e85cc5 547static void prb_setup_retire_blk_timer(struct packet_sock *po)
f6fb8f10 548{
bc59ba39 549 struct tpacket_kbdq_core *pkc;
f6fb8f10 550
e8e85cc5 551 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
f6fb8f10 552 prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired);
553}
554
555static int prb_calc_retire_blk_tmo(struct packet_sock *po,
556 int blk_size_in_bytes)
557{
558 struct net_device *dev;
559 unsigned int mbits = 0, msec = 0, div = 0, tmo = 0;
4bc71cb9
JP		 560 struct ethtool_cmd ecmd;
561 int err;
e440cf2c 562 u32 speed;
f6fb8f10 563
4bc71cb9
JP		 564 rtnl_lock();
565 dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex);
566 if (unlikely(!dev)) {
567 rtnl_unlock();
f6fb8f10 568 return DEFAULT_PRB_RETIRE_TOV;
4bc71cb9
JP		 569 }
570 err = __ethtool_get_settings(dev, &ecmd);
e440cf2c 571 speed = ethtool_cmd_speed(&ecmd);
4bc71cb9
JP		 572 rtnl_unlock();
573 if (!err) {
4bc71cb9
JP		 574 /*
575 * If the link speed is so slow you don't really
576 * need to worry about perf anyways
577 */
e440cf2c 578 if (speed < SPEED_1000 || speed == SPEED_UNKNOWN) {
4bc71cb9 579 return DEFAULT_PRB_RETIRE_TOV;
e440cf2c 580 } else {
581 msec = 1;
582 div = speed / 1000;
f6fb8f10 583 }
584 }
585
586 mbits = (blk_size_in_bytes * 8) / (1024 * 1024);
587
588 if (div)
589 mbits /= div;
590
591 tmo = mbits * msec;
592
593 if (div)
594 return tmo+1;
595 return tmo;
596}
597
bc59ba39 598static void prb_init_ft_ops(struct tpacket_kbdq_core *p1,
f6fb8f10 599 union tpacket_req_u *req_u)
600{
601 p1->feature_req_word = req_u->req3.tp_feature_req_word;
602}
603
604static void init_prb_bdqc(struct packet_sock *po,
605 struct packet_ring_buffer *rb,
606 struct pgv *pg_vec,
e8e85cc5 607 union tpacket_req_u *req_u)
f6fb8f10 608{
22781a5b 609 struct tpacket_kbdq_core *p1 = GET_PBDQC_FROM_RB(rb);
bc59ba39 610 struct tpacket_block_desc *pbd;
f6fb8f10 611
612 memset(p1, 0x0, sizeof(*p1));
613
614 p1->knxt_seq_num = 1;
615 p1->pkbdq = pg_vec;
bc59ba39 616 pbd = (struct tpacket_block_desc *)pg_vec[0].buffer;
e3192690 617 p1->pkblk_start = pg_vec[0].buffer;
f6fb8f10 618 p1->kblk_size = req_u->req3.tp_block_size;
619 p1->knum_blocks = req_u->req3.tp_block_nr;
620 p1->hdrlen = po->tp_hdrlen;
621 p1->version = po->tp_version;
622 p1->last_kactive_blk_num = 0;
ee80fbf3 623 po->stats.stats3.tp_freeze_q_cnt = 0;
f6fb8f10 624 if (req_u->req3.tp_retire_blk_tov)
625 p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov;
626 else
627 p1->retire_blk_tov = prb_calc_retire_blk_tmo(po,
628 req_u->req3.tp_block_size);
629 p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov);
630 p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv;
631
dc808110 632 p1->max_frame_len = p1->kblk_size - BLK_PLUS_PRIV(p1->blk_sizeof_priv);
f6fb8f10 633 prb_init_ft_ops(p1, req_u);
e8e85cc5 634 prb_setup_retire_blk_timer(po);
f6fb8f10 635 prb_open_block(p1, pbd);
636}
637
638/* Do NOT update the last_blk_num first.
639 * Assumes sk_buff_head lock is held.
640 */
bc59ba39 641static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc)
f6fb8f10 642{
643 mod_timer(&pkc->retire_blk_timer,
644 jiffies + pkc->tov_in_jiffies);
645 pkc->last_kactive_blk_num = pkc->kactive_blk_num;
646}
647
648/*
649 * Timer logic:
650 * 1) We refresh the timer only when we open a block.
651 * By doing this we don't waste cycles refreshing the timer
652 * on packet-by-packet basis.
653 *
654 * With a 1MB block-size, on a 1Gbps line, it will take
655 * i) ~8 ms to fill a block + ii) memcpy etc.
656 * In this cut we are not accounting for the memcpy time.
657 *
658 * So, if the user sets the 'tmo' to 10ms then the timer
659 * will never fire while the block is still getting filled
660 * (which is what we want). However, the user could choose
661 * to close a block early and that's fine.
662 *
663 * But when the timer does fire, we check whether or not to refresh it.
664 * Since the tmo granularity is in msecs, it is not too expensive
665 * to refresh the timer, lets say every '8' msecs.
666 * Either the user can set the 'tmo' or we can derive it based on
667 * a) line-speed and b) block-size.
668 * prb_calc_retire_blk_tmo() calculates the tmo.
669 *
670 */
671static void prb_retire_rx_blk_timer_expired(unsigned long data)
672{
673 struct packet_sock *po = (struct packet_sock *)data;
22781a5b 674 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
f6fb8f10 675 unsigned int frozen;
bc59ba39 676 struct tpacket_block_desc *pbd;
f6fb8f10 677
678 spin_lock(&po->sk.sk_receive_queue.lock);
679
680 frozen = prb_queue_frozen(pkc);
681 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
682
683 if (unlikely(pkc->delete_blk_timer))
684 goto out;
685
686 /* We only need to plug the race when the block is partially filled.
687 * tpacket_rcv:
688 * lock(); increment BLOCK_NUM_PKTS; unlock()
689 * copy_bits() is in progress ...
690 * timer fires on other cpu:
691 * we can't retire the current block because copy_bits
692 * is in progress.
693 *
694 */
695 if (BLOCK_NUM_PKTS(pbd)) {
696 while (atomic_read(&pkc->blk_fill_in_prog)) {
697 /* Waiting for skb_copy_bits to finish... */
698 cpu_relax();
699 }
700 }
701
702 if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) {
703 if (!frozen) {
41a50d62
AD		 704 if (!BLOCK_NUM_PKTS(pbd)) {
705 /* An empty block. Just refresh the timer. */
706 goto refresh_timer;
707 }
f6fb8f10 708 prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO);
709 if (!prb_dispatch_next_block(pkc, po))
710 goto refresh_timer;
711 else
712 goto out;
713 } else {
714 /* Case 1. Queue was frozen because user-space was
715 * lagging behind.
716 */
717 if (prb_curr_blk_in_use(pkc, pbd)) {
718 /*
719 * Ok, user-space is still behind.
720 * So just refresh the timer.
721 */
722 goto refresh_timer;
723 } else {
724 /* Case 2. queue was frozen,user-space caught up,
725 * now the link went idle && the timer fired.
726 * We don't have a block to close.So we open this
727 * block and restart the timer.
728 * opening a block thaws the queue,restarts timer
729 * Thawing/timer-refresh is a side effect.
730 */
731 prb_open_block(pkc, pbd);
732 goto out;
733 }
734 }
735 }
736
737refresh_timer:
738 _prb_refresh_rx_retire_blk_timer(pkc);
739
740out:
741 spin_unlock(&po->sk.sk_receive_queue.lock);
742}
743
eea49cc9 744static void prb_flush_block(struct tpacket_kbdq_core *pkc1,
bc59ba39 745 struct tpacket_block_desc *pbd1, __u32 status)
f6fb8f10 746{
747 /* Flush everything minus the block header */
748
749#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
750 u8 *start, *end;
751
752 start = (u8 *)pbd1;
753
754 /* Skip the block header(we know header WILL fit in 4K) */
755 start += PAGE_SIZE;
756
757 end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end);
758 for (; start < end; start += PAGE_SIZE)
759 flush_dcache_page(pgv_to_page(start));
760
761 smp_wmb();
762#endif
763
764 /* Now update the block status. */
765
766 BLOCK_STATUS(pbd1) = status;
767
768 /* Flush the block header */
769
770#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
771 start = (u8 *)pbd1;
772 flush_dcache_page(pgv_to_page(start));
773
774 smp_wmb();
775#endif
776}
777
778/*
779 * Side effect:
780 *
781 * 1) flush the block
782 * 2) Increment active_blk_num
783 *
784 * Note:We DONT refresh the timer on purpose.
785 * Because almost always the next block will be opened.
786 */
bc59ba39 787static void prb_close_block(struct tpacket_kbdq_core *pkc1,
788 struct tpacket_block_desc *pbd1,
f6fb8f10 789 struct packet_sock *po, unsigned int stat)
790{
791 __u32 status = TP_STATUS_USER | stat;
792
793 struct tpacket3_hdr *last_pkt;
bc59ba39 794 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
da413eec 795 struct sock *sk = &po->sk;
f6fb8f10 796
ee80fbf3 797 if (po->stats.stats3.tp_drops)
f6fb8f10 798 status |= TP_STATUS_LOSING;
799
800 last_pkt = (struct tpacket3_hdr *)pkc1->prev;
801 last_pkt->tp_next_offset = 0;
802
803 /* Get the ts of the last pkt */
804 if (BLOCK_NUM_PKTS(pbd1)) {
805 h1->ts_last_pkt.ts_sec = last_pkt->tp_sec;
806 h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec;
807 } else {
41a50d62
AD		 808 /* Ok, we tmo'd - so get the current time.
809 *
810 * It shouldn't really happen as we don't close empty
811 * blocks. See prb_retire_rx_blk_timer_expired().
812 */
f6fb8f10 813 struct timespec ts;
814 getnstimeofday(&ts);
815 h1->ts_last_pkt.ts_sec = ts.tv_sec;
816 h1->ts_last_pkt.ts_nsec = ts.tv_nsec;
817 }
818
819 smp_wmb();
820
821 /* Flush the block */
822 prb_flush_block(pkc1, pbd1, status);
823
da413eec
DC		 824 sk->sk_data_ready(sk);
825
f6fb8f10 826 pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1);
827}
828
eea49cc9 829static void prb_thaw_queue(struct tpacket_kbdq_core *pkc)
f6fb8f10 830{
831 pkc->reset_pending_on_curr_blk = 0;
832}
833
834/*
835 * Side effect of opening a block:
836 *
837 * 1) prb_queue is thawed.
838 * 2) retire_blk_timer is refreshed.
839 *
840 */
bc59ba39 841static void prb_open_block(struct tpacket_kbdq_core *pkc1,
842 struct tpacket_block_desc *pbd1)
f6fb8f10 843{
844 struct timespec ts;
bc59ba39 845 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
f6fb8f10 846
847 smp_rmb();
848
8da3056c
DB		 849 /* We could have just memset this but we will lose the
850 * flexibility of making the priv area sticky
851 */
f6fb8f10 852
8da3056c
DB		 853 BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++;
854 BLOCK_NUM_PKTS(pbd1) = 0;
855 BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
f6fb8f10 856
8da3056c
DB		 857 getnstimeofday(&ts);
858
859 h1->ts_first_pkt.ts_sec = ts.tv_sec;
860 h1->ts_first_pkt.ts_nsec = ts.tv_nsec;
f6fb8f10 861
8da3056c
DB		 862 pkc1->pkblk_start = (char *)pbd1;
863 pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
864
865 BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
866 BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN;
867
868 pbd1->version = pkc1->version;
869 pkc1->prev = pkc1->nxt_offset;
870 pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size;
871
872 prb_thaw_queue(pkc1);
873 _prb_refresh_rx_retire_blk_timer(pkc1);
874
875 smp_wmb();
f6fb8f10 876}
877
878/*
879 * Queue freeze logic:
880 * 1) Assume tp_block_nr = 8 blocks.
881 * 2) At time 't0', user opens Rx ring.
882 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
883 * 4) user-space is either sleeping or processing block '0'.
884 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
885 * it will close block-7,loop around and try to fill block '0'.
886 * call-flow:
887 * __packet_lookup_frame_in_block
888 * prb_retire_current_block()
889 * prb_dispatch_next_block()
890 * |->(BLOCK_STATUS == USER) evaluates to true
891 * 5.1) Since block-0 is currently in-use, we just freeze the queue.
892 * 6) Now there are two cases:
893 * 6.1) Link goes idle right after the queue is frozen.
894 * But remember, the last open_block() refreshed the timer.
895 * When this timer expires,it will refresh itself so that we can
896 * re-open block-0 in near future.
897 * 6.2) Link is busy and keeps on receiving packets. This is a simple
898 * case and __packet_lookup_frame_in_block will check if block-0
899 * is free and can now be re-used.
900 */
eea49cc9 901static void prb_freeze_queue(struct tpacket_kbdq_core *pkc,
f6fb8f10 902 struct packet_sock *po)
903{
904 pkc->reset_pending_on_curr_blk = 1;
ee80fbf3 905 po->stats.stats3.tp_freeze_q_cnt++;
f6fb8f10 906}
907
908#define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
909
910/*
911 * If the next block is free then we will dispatch it
912 * and return a good offset.
913 * Else, we will freeze the queue.
914 * So, caller must check the return value.
915 */
bc59ba39 916static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc,
f6fb8f10 917 struct packet_sock *po)
918{
bc59ba39 919 struct tpacket_block_desc *pbd;
f6fb8f10 920
921 smp_rmb();
922
923 /* 1. Get current block num */
924 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
925
926 /* 2. If this block is currently in_use then freeze the queue */
927 if (TP_STATUS_USER & BLOCK_STATUS(pbd)) {
928 prb_freeze_queue(pkc, po);
929 return NULL;
930 }
931
932 /*
933 * 3.
934 * open this block and return the offset where the first packet
935 * needs to get stored.
936 */
937 prb_open_block(pkc, pbd);
938 return (void *)pkc->nxt_offset;
939}
940
bc59ba39 941static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
f6fb8f10 942 struct packet_sock *po, unsigned int status)
943{
bc59ba39 944 struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
f6fb8f10 945
946 /* retire/close the current block */
947 if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) {
948 /*
949 * Plug the case where copy_bits() is in progress on
950 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
951 * have space to copy the pkt in the current block and
952 * called prb_retire_current_block()
953 *
954 * We don't need to worry about the TMO case because
955 * the timer-handler already handled this case.
956 */
957 if (!(status & TP_STATUS_BLK_TMO)) {
958 while (atomic_read(&pkc->blk_fill_in_prog)) {
959 /* Waiting for skb_copy_bits to finish... */
960 cpu_relax();
961 }
962 }
963 prb_close_block(pkc, pbd, po, status);
964 return;
965 }
f6fb8f10 966}
967
eea49cc9 968static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc,
bc59ba39 969 struct tpacket_block_desc *pbd)
f6fb8f10 970{
971 return TP_STATUS_USER & BLOCK_STATUS(pbd);
972}
973
eea49cc9 974static int prb_queue_frozen(struct tpacket_kbdq_core *pkc)
f6fb8f10 975{
976 return pkc->reset_pending_on_curr_blk;
977}
978
eea49cc9 979static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb)
f6fb8f10 980{
bc59ba39 981 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
f6fb8f10 982 atomic_dec(&pkc->blk_fill_in_prog);
983}
984
eea49cc9 985static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc,
f6fb8f10 986 struct tpacket3_hdr *ppd)
987{
3958afa1 988 ppd->hv1.tp_rxhash = skb_get_hash(pkc->skb);
f6fb8f10 989}
990
eea49cc9 991static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc,
f6fb8f10 992 struct tpacket3_hdr *ppd)
993{
994 ppd->hv1.tp_rxhash = 0;
995}
996
eea49cc9 997static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
f6fb8f10 998 struct tpacket3_hdr *ppd)
999{
df8a39de
JP		 1000 if (skb_vlan_tag_present(pkc->skb)) {
1001 ppd->hv1.tp_vlan_tci = skb_vlan_tag_get(pkc->skb);
a0cdfcf3
AW		 1002 ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->vlan_proto);
1003 ppd->tp_status = TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
f6fb8f10 1004 } else {
9e67030a 1005 ppd->hv1.tp_vlan_tci = 0;
a0cdfcf3 1006 ppd->hv1.tp_vlan_tpid = 0;
9e67030a 1007 ppd->tp_status = TP_STATUS_AVAILABLE;
f6fb8f10 1008 }
1009}
1010
bc59ba39 1011static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc,
f6fb8f10 1012 struct tpacket3_hdr *ppd)
1013{
a0cdfcf3 1014 ppd->hv1.tp_padding = 0;
f6fb8f10 1015 prb_fill_vlan_info(pkc, ppd);
1016
1017 if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH)
1018 prb_fill_rxhash(pkc, ppd);
1019 else
1020 prb_clear_rxhash(pkc, ppd);
1021}
1022
eea49cc9 1023static void prb_fill_curr_block(char *curr,
bc59ba39 1024 struct tpacket_kbdq_core *pkc,
1025 struct tpacket_block_desc *pbd,
f6fb8f10 1026 unsigned int len)
1027{
1028 struct tpacket3_hdr *ppd;
1029
1030 ppd = (struct tpacket3_hdr *)curr;
1031 ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len);
1032 pkc->prev = curr;
1033 pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len);
1034 BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len);
1035 BLOCK_NUM_PKTS(pbd) += 1;
1036 atomic_inc(&pkc->blk_fill_in_prog);
1037 prb_run_all_ft_ops(pkc, ppd);
1038}
1039
1040/* Assumes caller has the sk->rx_queue.lock */
1041static void *__packet_lookup_frame_in_block(struct packet_sock *po,
1042 struct sk_buff *skb,
1043 int status,
1044 unsigned int len
1045 )
1046{
bc59ba39 1047 struct tpacket_kbdq_core *pkc;
1048 struct tpacket_block_desc *pbd;
f6fb8f10 1049 char *curr, *end;
1050
e3192690 1051 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
f6fb8f10 1052 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1053
1054 /* Queue is frozen when user space is lagging behind */
1055 if (prb_queue_frozen(pkc)) {
1056 /*
1057 * Check if that last block which caused the queue to freeze,
1058 * is still in_use by user-space.
1059 */
1060 if (prb_curr_blk_in_use(pkc, pbd)) {
1061 /* Can't record this packet */
1062 return NULL;
1063 } else {
1064 /*
1065 * Ok, the block was released by user-space.
1066 * Now let's open that block.
1067 * opening a block also thaws the queue.
1068 * Thawing is a side effect.
1069 */
1070 prb_open_block(pkc, pbd);
1071 }
1072 }
1073
1074 smp_mb();
1075 curr = pkc->nxt_offset;
1076 pkc->skb = skb;
e3192690 1077 end = (char *)pbd + pkc->kblk_size;
f6fb8f10 1078
1079 /* first try the current block */
1080 if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) {
1081 prb_fill_curr_block(curr, pkc, pbd, len);
1082 return (void *)curr;
1083 }
1084
1085 /* Ok, close the current block */
1086 prb_retire_current_block(pkc, po, 0);
1087
1088 /* Now, try to dispatch the next block */
1089 curr = (char *)prb_dispatch_next_block(pkc, po);
1090 if (curr) {
1091 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1092 prb_fill_curr_block(curr, pkc, pbd, len);
1093 return (void *)curr;
1094 }
1095
1096 /*
1097 * No free blocks are available.user_space hasn't caught up yet.
1098 * Queue was just frozen and now this packet will get dropped.
1099 */
1100 return NULL;
1101}
1102
eea49cc9 1103static void *packet_current_rx_frame(struct packet_sock *po,
f6fb8f10 1104 struct sk_buff *skb,
1105 int status, unsigned int len)
1106{
1107 char *curr = NULL;
1108 switch (po->tp_version) {
1109 case TPACKET_V1:
1110 case TPACKET_V2:
1111 curr = packet_lookup_frame(po, &po->rx_ring,
1112 po->rx_ring.head, status);
1113 return curr;
1114 case TPACKET_V3:
1115 return __packet_lookup_frame_in_block(po, skb, status, len);
1116 default:
1117 WARN(1, "TPACKET version not supported\n");
1118 BUG();
99aa3473 1119 return NULL;
f6fb8f10 1120 }
1121}
1122
eea49cc9 1123static void *prb_lookup_block(struct packet_sock *po,
f6fb8f10 1124 struct packet_ring_buffer *rb,
77f65ebd 1125 unsigned int idx,
f6fb8f10 1126 int status)
1127{
bc59ba39 1128 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
77f65ebd 1129 struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx);
f6fb8f10 1130
1131 if (status != BLOCK_STATUS(pbd))
1132 return NULL;
1133 return pbd;
1134}
1135
eea49cc9 1136static int prb_previous_blk_num(struct packet_ring_buffer *rb)
f6fb8f10 1137{
1138 unsigned int prev;
1139 if (rb->prb_bdqc.kactive_blk_num)
1140 prev = rb->prb_bdqc.kactive_blk_num-1;
1141 else
1142 prev = rb->prb_bdqc.knum_blocks-1;
1143 return prev;
1144}
1145
1146/* Assumes caller has held the rx_queue.lock */
eea49cc9 1147static void *__prb_previous_block(struct packet_sock *po,
f6fb8f10 1148 struct packet_ring_buffer *rb,
1149 int status)
1150{
1151 unsigned int previous = prb_previous_blk_num(rb);
1152 return prb_lookup_block(po, rb, previous, status);
1153}
1154
eea49cc9 1155static void *packet_previous_rx_frame(struct packet_sock *po,
f6fb8f10 1156 struct packet_ring_buffer *rb,
1157 int status)
1158{
1159 if (po->tp_version <= TPACKET_V2)
1160 return packet_previous_frame(po, rb, status);
1161
1162 return __prb_previous_block(po, rb, status);
1163}
1164
eea49cc9 1165static void packet_increment_rx_head(struct packet_sock *po,
f6fb8f10 1166 struct packet_ring_buffer *rb)
1167{
1168 switch (po->tp_version) {
1169 case TPACKET_V1:
1170 case TPACKET_V2:
1171 return packet_increment_head(rb);
1172 case TPACKET_V3:
1173 default:
1174 WARN(1, "TPACKET version not supported.\n");
1175 BUG();
1176 return;
1177 }
1178}
1179
eea49cc9 1180static void *packet_previous_frame(struct packet_sock *po,
69e3c75f
JB		 1181 struct packet_ring_buffer *rb,
1182 int status)
1183{
1184 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
1185 return packet_lookup_frame(po, rb, previous, status);
1186}
1187
eea49cc9 1188static void packet_increment_head(struct packet_ring_buffer *buff)
69e3c75f
JB		 1189{
1190 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
1191}
1192
b0138408
DB		 1193static void packet_inc_pending(struct packet_ring_buffer *rb)
1194{
1195 this_cpu_inc(*rb->pending_refcnt);
1196}
1197
1198static void packet_dec_pending(struct packet_ring_buffer *rb)
1199{
1200 this_cpu_dec(*rb->pending_refcnt);
1201}
1202
1203static unsigned int packet_read_pending(const struct packet_ring_buffer *rb)
1204{
1205 unsigned int refcnt = 0;
1206 int cpu;
1207
1208 /* We don't use pending refcount in rx_ring. */
1209 if (rb->pending_refcnt == NULL)
1210 return 0;
1211
1212 for_each_possible_cpu(cpu)
1213 refcnt += *per_cpu_ptr(rb->pending_refcnt, cpu);
1214
1215 return refcnt;
1216}
1217
1218static int packet_alloc_pending(struct packet_sock *po)
1219{
1220 po->rx_ring.pending_refcnt = NULL;
1221
1222 po->tx_ring.pending_refcnt = alloc_percpu(unsigned int);
1223 if (unlikely(po->tx_ring.pending_refcnt == NULL))
1224 return -ENOBUFS;
1225
1226 return 0;
1227}
1228
1229static void packet_free_pending(struct packet_sock *po)
1230{
1231 free_percpu(po->tx_ring.pending_refcnt);
1232}
1233
9954729b
WB		 1234#define ROOM_POW_OFF 2
1235#define ROOM_NONE 0x0
1236#define ROOM_LOW 0x1
1237#define ROOM_NORMAL 0x2
1238
1239static bool __tpacket_has_room(struct packet_sock *po, int pow_off)
77f65ebd 1240{
9954729b
WB		 1241 int idx, len;
1242
1243 len = po->rx_ring.frame_max + 1;
1244 idx = po->rx_ring.head;
1245 if (pow_off)
1246 idx += len >> pow_off;
1247 if (idx >= len)
1248 idx -= len;
1249 return packet_lookup_frame(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1250}
1251
1252static bool __tpacket_v3_has_room(struct packet_sock *po, int pow_off)
1253{
1254 int idx, len;
1255
1256 len = po->rx_ring.prb_bdqc.knum_blocks;
1257 idx = po->rx_ring.prb_bdqc.kactive_blk_num;
1258 if (pow_off)
1259 idx += len >> pow_off;
1260 if (idx >= len)
1261 idx -= len;
1262 return prb_lookup_block(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1263}
77f65ebd 1264
2ccdbaa6 1265static int __packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
9954729b
WB		 1266{
1267 struct sock *sk = &po->sk;
1268 int ret = ROOM_NONE;
1269
1270 if (po->prot_hook.func != tpacket_rcv) {
1271 int avail = sk->sk_rcvbuf - atomic_read(&sk->sk_rmem_alloc)
2ccdbaa6 1272 - (skb ? skb->truesize : 0);
9954729b
WB		 1273 if (avail > (sk->sk_rcvbuf >> ROOM_POW_OFF))
1274 return ROOM_NORMAL;
1275 else if (avail > 0)
1276 return ROOM_LOW;
1277 else
1278 return ROOM_NONE;
1279 }
77f65ebd 1280
9954729b
WB		 1281 if (po->tp_version == TPACKET_V3) {
1282 if (__tpacket_v3_has_room(po, ROOM_POW_OFF))
1283 ret = ROOM_NORMAL;
1284 else if (__tpacket_v3_has_room(po, 0))
1285 ret = ROOM_LOW;
1286 } else {
1287 if (__tpacket_has_room(po, ROOM_POW_OFF))
1288 ret = ROOM_NORMAL;
1289 else if (__tpacket_has_room(po, 0))
1290 ret = ROOM_LOW;
1291 }
2ccdbaa6
WB		 1292
1293 return ret;
1294}
1295
1296static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
1297{
1298 int ret;
1299 bool has_room;
1300
54d7c01d
WB		 1301 spin_lock_bh(&po->sk.sk_receive_queue.lock);
1302 ret = __packet_rcv_has_room(po, skb);
2ccdbaa6
WB		 1303 has_room = ret == ROOM_NORMAL;
1304 if (po->pressure == has_room)
54d7c01d
WB		 1305 po->pressure = !has_room;
1306 spin_unlock_bh(&po->sk.sk_receive_queue.lock);
77f65ebd 1307
9954729b 1308 return ret;
77f65ebd
WB		 1309}
1310
1da177e4
LT		 1311static void packet_sock_destruct(struct sock *sk)
1312{
ed85b565
RC		 1313 skb_queue_purge(&sk->sk_error_queue);
1314
547b792c
IJ		 1315 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
1316 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
1da177e4
LT		 1317
1318 if (!sock_flag(sk, SOCK_DEAD)) {
40d4e3df 1319 pr_err("Attempt to release alive packet socket: %p\n", sk);
1da177e4
LT		 1320 return;
1321 }
1322
17ab56a2 1323 sk_refcnt_debug_dec(sk);
1da177e4
LT		 1324}
1325
3b3a5b0a
WB		 1326static bool fanout_flow_is_huge(struct packet_sock *po, struct sk_buff *skb)
1327{
1328 u32 rxhash;
1329 int i, count = 0;
1330
1331 rxhash = skb_get_hash(skb);
1332 for (i = 0; i < ROLLOVER_HLEN; i++)
1333 if (po->rollover->history[i] == rxhash)
1334 count++;
1335
1336 po->rollover->history[prandom_u32() % ROLLOVER_HLEN] = rxhash;
1337 return count > (ROLLOVER_HLEN >> 1);
1338}
1339
77f65ebd
WB		 1340static unsigned int fanout_demux_hash(struct packet_fanout *f,
1341 struct sk_buff *skb,
1342 unsigned int num)
dc99f600 1343{
61b905da 1344 return reciprocal_scale(skb_get_hash(skb), num);
dc99f600
DM		 1345}
1346
77f65ebd
WB		 1347static unsigned int fanout_demux_lb(struct packet_fanout *f,
1348 struct sk_buff *skb,
1349 unsigned int num)
dc99f600 1350{
468479e6 1351 unsigned int val = atomic_inc_return(&f->rr_cur);
dc99f600 1352
468479e6 1353 return val % num;
77f65ebd
WB		 1354}
1355
1356static unsigned int fanout_demux_cpu(struct packet_fanout *f,
1357 struct sk_buff *skb,
1358 unsigned int num)
1359{
1360 return smp_processor_id() % num;
dc99f600
DM		 1361}
1362
5df0ddfb
DB		 1363static unsigned int fanout_demux_rnd(struct packet_fanout *f,
1364 struct sk_buff *skb,
1365 unsigned int num)
1366{
f337db64 1367 return prandom_u32_max(num);
5df0ddfb
DB		 1368}
1369
77f65ebd
WB		 1370static unsigned int fanout_demux_rollover(struct packet_fanout *f,
1371 struct sk_buff *skb,
ad377cab 1372 unsigned int idx, bool try_self,
77f65ebd 1373 unsigned int num)
95ec3eb4 1374{
4633c9e0 1375 struct packet_sock *po, *po_next, *po_skip = NULL;
a9b63918 1376 unsigned int i, j, room = ROOM_NONE;
95ec3eb4 1377
0648ab70 1378 po = pkt_sk(f->arr[idx]);
3b3a5b0a
WB		 1379
1380 if (try_self) {
1381 room = packet_rcv_has_room(po, skb);
1382 if (room == ROOM_NORMAL ||
1383 (room == ROOM_LOW && !fanout_flow_is_huge(po, skb)))
1384 return idx;
4633c9e0 1385 po_skip = po;
3b3a5b0a 1386 }
ad377cab 1387
0648ab70 1388 i = j = min_t(int, po->rollover->sock, num - 1);
77f65ebd 1389 do {
2ccdbaa6 1390 po_next = pkt_sk(f->arr[i]);
4633c9e0 1391 if (po_next != po_skip && !po_next->pressure &&
2ccdbaa6 1392 packet_rcv_has_room(po_next, skb) == ROOM_NORMAL) {
77f65ebd 1393 if (i != j)
0648ab70 1394 po->rollover->sock = i;
a9b63918
WB		 1395 atomic_long_inc(&po->rollover->num);
1396 if (room == ROOM_LOW)
1397 atomic_long_inc(&po->rollover->num_huge);
77f65ebd
WB		 1398 return i;
1399 }
ad377cab 1400
77f65ebd
WB		 1401 if (++i == num)
1402 i = 0;
1403 } while (i != j);
1404
a9b63918 1405 atomic_long_inc(&po->rollover->num_failed);
77f65ebd
WB		 1406 return idx;
1407}
1408
2d36097d
NH		 1409static unsigned int fanout_demux_qm(struct packet_fanout *f,
1410 struct sk_buff *skb,
1411 unsigned int num)
1412{
1413 return skb_get_queue_mapping(skb) % num;
1414}
1415
47dceb8e
WB		 1416static unsigned int fanout_demux_bpf(struct packet_fanout *f,
1417 struct sk_buff *skb,
1418 unsigned int num)
1419{
1420 struct bpf_prog *prog;
1421 unsigned int ret = 0;
1422
1423 rcu_read_lock();
1424 prog = rcu_dereference(f->bpf_prog);
1425 if (prog)
ff936a04 1426 ret = bpf_prog_run_clear_cb(prog, skb) % num;
47dceb8e
WB		 1427 rcu_read_unlock();
1428
1429 return ret;
1430}
1431
77f65ebd
WB		 1432static bool fanout_has_flag(struct packet_fanout *f, u16 flag)
1433{
1434 return f->flags & (flag >> 8);
95ec3eb4
DM		 1435}
1436
95ec3eb4
DM		 1437static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
1438 struct packet_type *pt, struct net_device *orig_dev)
dc99f600
DM		 1439{
1440 struct packet_fanout *f = pt->af_packet_priv;
f98f4514 1441 unsigned int num = READ_ONCE(f->num_members);
dc99f600 1442 struct packet_sock *po;
77f65ebd 1443 unsigned int idx;
dc99f600
DM		 1444
1445 if (!net_eq(dev_net(dev), read_pnet(&f->net)) ||
1446 !num) {
1447 kfree_skb(skb);
1448 return 0;
1449 }
1450
3f34b24a
AD		 1451 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) {
1452 skb = ip_check_defrag(skb, IP_DEFRAG_AF_PACKET);
1453 if (!skb)
1454 return 0;
1455 }
95ec3eb4
DM		 1456 switch (f->type) {
1457 case PACKET_FANOUT_HASH:
1458 default:
77f65ebd 1459 idx = fanout_demux_hash(f, skb, num);
95ec3eb4
DM		 1460 break;
1461 case PACKET_FANOUT_LB:
77f65ebd 1462 idx = fanout_demux_lb(f, skb, num);
95ec3eb4
DM		 1463 break;
1464 case PACKET_FANOUT_CPU:
77f65ebd
WB		 1465 idx = fanout_demux_cpu(f, skb, num);
1466 break;
5df0ddfb
DB		 1467 case PACKET_FANOUT_RND:
1468 idx = fanout_demux_rnd(f, skb, num);
1469 break;
2d36097d
NH		 1470 case PACKET_FANOUT_QM:
1471 idx = fanout_demux_qm(f, skb, num);
1472 break;
77f65ebd 1473 case PACKET_FANOUT_ROLLOVER:
ad377cab 1474 idx = fanout_demux_rollover(f, skb, 0, false, num);
95ec3eb4 1475 break;
47dceb8e 1476 case PACKET_FANOUT_CBPF:
f2e52095 1477 case PACKET_FANOUT_EBPF:
47dceb8e
WB		 1478 idx = fanout_demux_bpf(f, skb, num);
1479 break;
dc99f600
DM		 1480 }
1481
ad377cab
WB		 1482 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER))
1483 idx = fanout_demux_rollover(f, skb, idx, true, num);
dc99f600 1484
ad377cab 1485 po = pkt_sk(f->arr[idx]);
dc99f600
DM		 1486 return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
1487}
1488
fff3321d
PE		 1489DEFINE_MUTEX(fanout_mutex);
1490EXPORT_SYMBOL_GPL(fanout_mutex);
dc99f600
DM		 1491static LIST_HEAD(fanout_list);
1492
1493static void __fanout_link(struct sock *sk, struct packet_sock *po)
1494{
1495 struct packet_fanout *f = po->fanout;
1496
1497 spin_lock(&f->lock);
1498 f->arr[f->num_members] = sk;
1499 smp_wmb();
1500 f->num_members++;
1501 spin_unlock(&f->lock);
1502}
1503
1504static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
1505{
1506 struct packet_fanout *f = po->fanout;
1507 int i;
1508
1509 spin_lock(&f->lock);
1510 for (i = 0; i < f->num_members; i++) {
1511 if (f->arr[i] == sk)
1512 break;
1513 }
1514 BUG_ON(i >= f->num_members);
1515 f->arr[i] = f->arr[f->num_members - 1];
1516 f->num_members--;
1517 spin_unlock(&f->lock);
1518}
1519
d4dd8aee 1520static bool match_fanout_group(struct packet_type *ptype, struct sock *sk)
c0de08d0 1521{
d4dd8aee 1522 if (ptype->af_packet_priv == (void *)((struct packet_sock *)sk)->fanout)
c0de08d0
EL		 1523 return true;
1524
1525 return false;
1526}
1527
47dceb8e
WB		 1528static void fanout_init_data(struct packet_fanout *f)
1529{
1530 switch (f->type) {
1531 case PACKET_FANOUT_LB:
1532 atomic_set(&f->rr_cur, 0);
1533 break;
1534 case PACKET_FANOUT_CBPF:
f2e52095 1535 case PACKET_FANOUT_EBPF:
47dceb8e
WB		 1536 RCU_INIT_POINTER(f->bpf_prog, NULL);
1537 break;
1538 }
1539}
1540
1541static void __fanout_set_data_bpf(struct packet_fanout *f, struct bpf_prog *new)
1542{
1543 struct bpf_prog *old;
1544
1545 spin_lock(&f->lock);
1546 old = rcu_dereference_protected(f->bpf_prog, lockdep_is_held(&f->lock));
1547 rcu_assign_pointer(f->bpf_prog, new);
1548 spin_unlock(&f->lock);
1549
1550 if (old) {
1551 synchronize_net();
1552 bpf_prog_destroy(old);
1553 }
1554}
1555
1556static int fanout_set_data_cbpf(struct packet_sock *po, char __user *data,
1557 unsigned int len)
1558{
1559 struct bpf_prog *new;
1560 struct sock_fprog fprog;
1561 int ret;
1562
1563 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1564 return -EPERM;
1565 if (len != sizeof(fprog))
1566 return -EINVAL;
1567 if (copy_from_user(&fprog, data, len))
1568 return -EFAULT;
1569
bab18991 1570 ret = bpf_prog_create_from_user(&new, &fprog, NULL, false);
47dceb8e
WB		 1571 if (ret)
1572 return ret;
1573
1574 __fanout_set_data_bpf(po->fanout, new);
1575 return 0;
1576}
1577
f2e52095
WB		 1578static int fanout_set_data_ebpf(struct packet_sock *po, char __user *data,
1579 unsigned int len)
1580{
1581 struct bpf_prog *new;
1582 u32 fd;
1583
1584 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1585 return -EPERM;
1586 if (len != sizeof(fd))
1587 return -EINVAL;
1588 if (copy_from_user(&fd, data, len))
1589 return -EFAULT;
1590
1591 new = bpf_prog_get(fd);
1592 if (IS_ERR(new))
1593 return PTR_ERR(new);
1594 if (new->type != BPF_PROG_TYPE_SOCKET_FILTER) {
1595 bpf_prog_put(new);
1596 return -EINVAL;
1597 }
1598
1599 __fanout_set_data_bpf(po->fanout, new);
1600 return 0;
1601}
1602
47dceb8e
WB		 1603static int fanout_set_data(struct packet_sock *po, char __user *data,
1604 unsigned int len)
1605{
1606 switch (po->fanout->type) {
1607 case PACKET_FANOUT_CBPF:
1608 return fanout_set_data_cbpf(po, data, len);
f2e52095
WB		 1609 case PACKET_FANOUT_EBPF:
1610 return fanout_set_data_ebpf(po, data, len);
47dceb8e
WB		 1611 default:
1612 return -EINVAL;
1613 };
1614}
1615
1616static void fanout_release_data(struct packet_fanout *f)
1617{
1618 switch (f->type) {
1619 case PACKET_FANOUT_CBPF:
f2e52095 1620 case PACKET_FANOUT_EBPF:
47dceb8e
WB		 1621 __fanout_set_data_bpf(f, NULL);
1622 };
1623}
1624
7736d33f 1625static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
dc99f600
DM		 1626{
1627 struct packet_sock *po = pkt_sk(sk);
1628 struct packet_fanout *f, *match;
7736d33f 1629 u8 type = type_flags & 0xff;
77f65ebd 1630 u8 flags = type_flags >> 8;
dc99f600
DM		 1631 int err;
1632
1633 switch (type) {
77f65ebd
WB		 1634 case PACKET_FANOUT_ROLLOVER:
1635 if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)
1636 return -EINVAL;
dc99f600
DM		 1637 case PACKET_FANOUT_HASH:
1638 case PACKET_FANOUT_LB:
95ec3eb4 1639 case PACKET_FANOUT_CPU:
5df0ddfb 1640 case PACKET_FANOUT_RND:
2d36097d 1641 case PACKET_FANOUT_QM:
47dceb8e 1642 case PACKET_FANOUT_CBPF:
f2e52095 1643 case PACKET_FANOUT_EBPF:
dc99f600
DM		 1644 break;
1645 default:
1646 return -EINVAL;
1647 }
1648
1649 if (!po->running)
1650 return -EINVAL;
1651
1652 if (po->fanout)
1653 return -EALREADY;
1654
4633c9e0
WB		 1655 if (type == PACKET_FANOUT_ROLLOVER ||
1656 (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) {
0648ab70
WB		 1657 po->rollover = kzalloc(sizeof(*po->rollover), GFP_KERNEL);
1658 if (!po->rollover)
1659 return -ENOMEM;
a9b63918
WB		 1660 atomic_long_set(&po->rollover->num, 0);
1661 atomic_long_set(&po->rollover->num_huge, 0);
1662 atomic_long_set(&po->rollover->num_failed, 0);
0648ab70
WB		 1663 }
1664
dc99f600
DM		 1665 mutex_lock(&fanout_mutex);
1666 match = NULL;
1667 list_for_each_entry(f, &fanout_list, list) {
1668 if (f->id == id &&
1669 read_pnet(&f->net) == sock_net(sk)) {
1670 match = f;
1671 break;
1672 }
1673 }
afe62c68 1674 err = -EINVAL;
77f65ebd 1675 if (match && match->flags != flags)
afe62c68 1676 goto out;
dc99f600 1677 if (!match) {
afe62c68 1678 err = -ENOMEM;
dc99f600 1679 match = kzalloc(sizeof(*match), GFP_KERNEL);
afe62c68
ED		 1680 if (!match)
1681 goto out;
1682 write_pnet(&match->net, sock_net(sk));
1683 match->id = id;
1684 match->type = type;
77f65ebd 1685 match->flags = flags;
afe62c68
ED		 1686 INIT_LIST_HEAD(&match->list);
1687 spin_lock_init(&match->lock);
1688 atomic_set(&match->sk_ref, 0);
47dceb8e 1689 fanout_init_data(match);
afe62c68
ED		 1690 match->prot_hook.type = po->prot_hook.type;
1691 match->prot_hook.dev = po->prot_hook.dev;
1692 match->prot_hook.func = packet_rcv_fanout;
1693 match->prot_hook.af_packet_priv = match;
c0de08d0 1694 match->prot_hook.id_match = match_fanout_group;
afe62c68
ED		 1695 dev_add_pack(&match->prot_hook);
1696 list_add(&match->list, &fanout_list);
dc99f600 1697 }
afe62c68
ED		 1698 err = -EINVAL;
1699 if (match->type == type &&
1700 match->prot_hook.type == po->prot_hook.type &&
1701 match->prot_hook.dev == po->prot_hook.dev) {
1702 err = -ENOSPC;
1703 if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
1704 __dev_remove_pack(&po->prot_hook);
1705 po->fanout = match;
1706 atomic_inc(&match->sk_ref);
1707 __fanout_link(sk, po);
1708 err = 0;
dc99f600
DM		 1709 }
1710 }
afe62c68 1711out:
dc99f600 1712 mutex_unlock(&fanout_mutex);
0648ab70
WB		 1713 if (err) {
1714 kfree(po->rollover);
1715 po->rollover = NULL;
1716 }
dc99f600
DM		 1717 return err;
1718}
1719
1720static void fanout_release(struct sock *sk)
1721{
1722 struct packet_sock *po = pkt_sk(sk);
1723 struct packet_fanout *f;
1724
1725 f = po->fanout;
1726 if (!f)
1727 return;
1728
fff3321d 1729 mutex_lock(&fanout_mutex);
dc99f600
DM		 1730 po->fanout = NULL;
1731
dc99f600
DM		 1732 if (atomic_dec_and_test(&f->sk_ref)) {
1733 list_del(&f->list);
1734 dev_remove_pack(&f->prot_hook);
47dceb8e 1735 fanout_release_data(f);
dc99f600
DM		 1736 kfree(f);
1737 }
1738 mutex_unlock(&fanout_mutex);
0648ab70 1739
59f21118
WB		 1740 if (po->rollover)
1741 kfree_rcu(po->rollover, rcu);
dc99f600 1742}
1da177e4 1743
90ddc4f0 1744static const struct proto_ops packet_ops;
1da177e4 1745
90ddc4f0 1746static const struct proto_ops packet_ops_spkt;
1da177e4 1747
40d4e3df
ED		 1748static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
1749 struct packet_type *pt, struct net_device *orig_dev)
1da177e4
LT		 1750{
1751 struct sock *sk;
1752 struct sockaddr_pkt *spkt;
1753
1754 /*
1755 * When we registered the protocol we saved the socket in the data
1756 * field for just this event.
1757 */
1758
1759 sk = pt->af_packet_priv;
1ce4f28b 1760
1da177e4
LT		 1761 /*
1762 * Yank back the headers [hope the device set this
1763 * right or kerboom...]
1764 *
1765 * Incoming packets have ll header pulled,
1766 * push it back.
1767 *
98e399f8 1768 * For outgoing ones skb->data == skb_mac_header(skb)
1da177e4
LT		 1769 * so that this procedure is noop.
1770 */
1771
1772 if (skb->pkt_type == PACKET_LOOPBACK)
1773 goto out;
1774
09ad9bc7 1775 if (!net_eq(dev_net(dev), sock_net(sk)))
d12d01d6
DL		 1776 goto out;
1777
40d4e3df
ED		 1778 skb = skb_share_check(skb, GFP_ATOMIC);
1779 if (skb == NULL)
1da177e4
LT		 1780 goto oom;
1781
1782 /* drop any routing info */
adf30907 1783 skb_dst_drop(skb);
1da177e4 1784
84531c24
PO		 1785 /* drop conntrack reference */
1786 nf_reset(skb);
1787
ffbc6111 1788 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
1da177e4 1789
98e399f8 1790 skb_push(skb, skb->data - skb_mac_header(skb));
1da177e4
LT		 1791
1792 /*
1793 * The SOCK_PACKET socket receives _all_ frames.
1794 */
1795
1796 spkt->spkt_family = dev->type;
1797 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
1798 spkt->spkt_protocol = skb->protocol;
1799
1800 /*
1801 * Charge the memory to the socket. This is done specifically
1802 * to prevent sockets using all the memory up.
1803 */
1804
40d4e3df 1805 if (sock_queue_rcv_skb(sk, skb) == 0)
1da177e4
LT		 1806 return 0;
1807
1808out:
1809 kfree_skb(skb);
1810oom:
1811 return 0;
1812}
1813
1814
1815/*
1816 * Output a raw packet to a device layer. This bypasses all the other
1817 * protocol layers and you must therefore supply it with a complete frame
1818 */
1ce4f28b 1819
1b784140
YX		 1820static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg,
1821 size_t len)
1da177e4
LT		 1822{
1823 struct sock *sk = sock->sk;
342dfc30 1824 DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name);
1a35ca80 1825 struct sk_buff *skb = NULL;
1da177e4 1826 struct net_device *dev;
40d4e3df 1827 __be16 proto = 0;
1da177e4 1828 int err;
3bdc0eba 1829 int extra_len = 0;
1ce4f28b 1830
1da177e4 1831 /*
1ce4f28b 1832 * Get and verify the address.
1da177e4
LT		 1833 */
1834
40d4e3df 1835 if (saddr) {
1da177e4 1836 if (msg->msg_namelen < sizeof(struct sockaddr))
40d4e3df
ED		 1837 return -EINVAL;
1838 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
1839 proto = saddr->spkt_protocol;
1840 } else
1841 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
1da177e4
LT		 1842
1843 /*
1ce4f28b 1844 * Find the device first to size check it
1da177e4
LT		 1845 */
1846
de74e92a 1847 saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0;
1a35ca80 1848retry:
654d1f8a
ED		 1849 rcu_read_lock();
1850 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
1da177e4
LT		 1851 err = -ENODEV;
1852 if (dev == NULL)
1853 goto out_unlock;
1ce4f28b 1854
d5e76b0a
DM		 1855 err = -ENETDOWN;
1856 if (!(dev->flags & IFF_UP))
1857 goto out_unlock;
1858
1da177e4 1859 /*
40d4e3df
ED		 1860 * You may not queue a frame bigger than the mtu. This is the lowest level
1861 * raw protocol and you must do your own fragmentation at this level.
1da177e4 1862 */
1ce4f28b 1863
3bdc0eba
BG		 1864 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
1865 if (!netif_supports_nofcs(dev)) {
1866 err = -EPROTONOSUPPORT;
1867 goto out_unlock;
1868 }
1869 extra_len = 4; /* We're doing our own CRC */
1870 }
1871
1da177e4 1872 err = -EMSGSIZE;
3bdc0eba 1873 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len)
1da177e4
LT		 1874 goto out_unlock;
1875
1a35ca80
ED		 1876 if (!skb) {
1877 size_t reserved = LL_RESERVED_SPACE(dev);
4ce40912 1878 int tlen = dev->needed_tailroom;
1a35ca80
ED		 1879 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
1880
1881 rcu_read_unlock();
4ce40912 1882 skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL);
1a35ca80
ED		 1883 if (skb == NULL)
1884 return -ENOBUFS;
1885 /* FIXME: Save some space for broken drivers that write a hard
1886 * header at transmission time by themselves. PPP is the notable
1887 * one here. This should really be fixed at the driver level.
1888 */
1889 skb_reserve(skb, reserved);
1890 skb_reset_network_header(skb);
1891
1892 /* Try to align data part correctly */
1893 if (hhlen) {
1894 skb->data -= hhlen;
1895 skb->tail -= hhlen;
1896 if (len < hhlen)
1897 skb_reset_network_header(skb);
1898 }
6ce8e9ce 1899 err = memcpy_from_msg(skb_put(skb, len), msg, len);
1a35ca80
ED		 1900 if (err)
1901 goto out_free;
1902 goto retry;
1da177e4
LT		 1903 }
1904
3bdc0eba 1905 if (len > (dev->mtu + dev->hard_header_len + extra_len)) {
57f89bfa
BG		 1906 /* Earlier code assumed this would be a VLAN pkt,
1907 * double-check this now that we have the actual
1908 * packet in hand.
1909 */
1910 struct ethhdr *ehdr;
1911 skb_reset_mac_header(skb);
1912 ehdr = eth_hdr(skb);
1913 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
1914 err = -EMSGSIZE;
1915 goto out_unlock;
1916 }
1917 }
1a35ca80 1918
1da177e4
LT		 1919 skb->protocol = proto;
1920 skb->dev = dev;
1921 skb->priority = sk->sk_priority;
2d37a186 1922 skb->mark = sk->sk_mark;
bf84a010
DB		 1923
1924 sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
1da177e4 1925
3bdc0eba
BG		 1926 if (unlikely(extra_len == 4))
1927 skb->no_fcs = 1;
1928
40893fd0 1929 skb_probe_transport_header(skb, 0);
c1aad275 1930
1da177e4 1931 dev_queue_xmit(skb);
654d1f8a 1932 rcu_read_unlock();
40d4e3df 1933 return len;
1da177e4 1934
1da177e4 1935out_unlock:
654d1f8a 1936 rcu_read_unlock();
1a35ca80
ED		 1937out_free:
1938 kfree_skb(skb);
1da177e4
LT		 1939 return err;
1940}
1da177e4 1941
ff936a04
AS		 1942static unsigned int run_filter(struct sk_buff *skb,
1943 const struct sock *sk,
1944 unsigned int res)
1da177e4
LT		 1945{
1946 struct sk_filter *filter;
fda9ef5d 1947
80f8f102
ED		 1948 rcu_read_lock();
1949 filter = rcu_dereference(sk->sk_filter);
dbcb5855 1950 if (filter != NULL)
ff936a04 1951 res = bpf_prog_run_clear_cb(filter->prog, skb);
80f8f102 1952 rcu_read_unlock();
1da177e4 1953
dbcb5855 1954 return res;
1da177e4
LT		 1955}
1956
1957/*
62ab0812
ED		 1958 * This function makes lazy skb cloning in hope that most of packets
1959 * are discarded by BPF.
1960 *
1961 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
1962 * and skb->cb are mangled. It works because (and until) packets
1963 * falling here are owned by current CPU. Output packets are cloned
1964 * by dev_queue_xmit_nit(), input packets are processed by net_bh
1965 * sequencially, so that if we return skb to original state on exit,
1966 * we will not harm anyone.
1da177e4
LT		 1967 */
1968
40d4e3df
ED		 1969static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
1970 struct packet_type *pt, struct net_device *orig_dev)
1da177e4
LT		 1971{
1972 struct sock *sk;
1973 struct sockaddr_ll *sll;
1974 struct packet_sock *po;
40d4e3df 1975 u8 *skb_head = skb->data;
1da177e4 1976 int skb_len = skb->len;
dbcb5855 1977 unsigned int snaplen, res;
1da177e4
LT		 1978
1979 if (skb->pkt_type == PACKET_LOOPBACK)
1980 goto drop;
1981
1982 sk = pt->af_packet_priv;
1983 po = pkt_sk(sk);
1984
09ad9bc7 1985 if (!net_eq(dev_net(dev), sock_net(sk)))
d12d01d6
DL		 1986 goto drop;
1987
1da177e4
LT		 1988 skb->dev = dev;
1989
3b04ddde 1990 if (dev->header_ops) {
1da177e4 1991 /* The device has an explicit notion of ll header,
62ab0812
ED		 1992 * exported to higher levels.
1993 *
1994 * Otherwise, the device hides details of its frame
1995 * structure, so that corresponding packet head is
1996 * never delivered to user.
1da177e4
LT		 1997 */
1998 if (sk->sk_type != SOCK_DGRAM)
98e399f8 1999 skb_push(skb, skb->data - skb_mac_header(skb));
1da177e4
LT		 2000 else if (skb->pkt_type == PACKET_OUTGOING) {
2001 /* Special case: outgoing packets have ll header at head */
bbe735e4 2002 skb_pull(skb, skb_network_offset(skb));
1da177e4
LT		 2003 }
2004 }
2005
2006 snaplen = skb->len;
2007
dbcb5855
DM		 2008 res = run_filter(skb, sk, snaplen);
2009 if (!res)
fda9ef5d 2010 goto drop_n_restore;
dbcb5855
DM		 2011 if (snaplen > res)
2012 snaplen = res;
1da177e4 2013
0fd7bac6 2014 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
1da177e4
LT		 2015 goto drop_n_acct;
2016
2017 if (skb_shared(skb)) {
2018 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
2019 if (nskb == NULL)
2020 goto drop_n_acct;
2021
2022 if (skb_head != skb->data) {
2023 skb->data = skb_head;
2024 skb->len = skb_len;
2025 }
abc4e4fa 2026 consume_skb(skb);
1da177e4
LT		 2027 skb = nskb;
2028 }
2029
b4772ef8 2030 sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8);
ffbc6111
HX		 2031
2032 sll = &PACKET_SKB_CB(skb)->sa.ll;
1da177e4 2033 sll->sll_hatype = dev->type;
1da177e4 2034 sll->sll_pkttype = skb->pkt_type;
8032b464 2035 if (unlikely(po->origdev))
80feaacb
PWJ		 2036 sll->sll_ifindex = orig_dev->ifindex;
2037 else
2038 sll->sll_ifindex = dev->ifindex;
1da177e4 2039
b95cce35 2040 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
1da177e4 2041
2472d761
EB		 2042 /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg().
2043 * Use their space for storing the original skb length.
2044 */
2045 PACKET_SKB_CB(skb)->sa.origlen = skb->len;
8dc41944 2046
1da177e4
LT		 2047 if (pskb_trim(skb, snaplen))
2048 goto drop_n_acct;
2049
2050 skb_set_owner_r(skb, sk);
2051 skb->dev = NULL;
adf30907 2052 skb_dst_drop(skb);
1da177e4 2053
84531c24
PO		 2054 /* drop conntrack reference */
2055 nf_reset(skb);
2056
1da177e4 2057 spin_lock(&sk->sk_receive_queue.lock);
ee80fbf3 2058 po->stats.stats1.tp_packets++;
3bc3b96f 2059 sock_skb_set_dropcount(sk, skb);
1da177e4
LT		 2060 __skb_queue_tail(&sk->sk_receive_queue, skb);
2061 spin_unlock(&sk->sk_receive_queue.lock);
676d2369 2062 sk->sk_data_ready(sk);
1da177e4
LT		 2063 return 0;
2064
2065drop_n_acct:
7091fbd8 2066 spin_lock(&sk->sk_receive_queue.lock);
ee80fbf3 2067 po->stats.stats1.tp_drops++;
7091fbd8
WB		 2068 atomic_inc(&sk->sk_drops);
2069 spin_unlock(&sk->sk_receive_queue.lock);
1da177e4
LT		 2070
2071drop_n_restore:
2072 if (skb_head != skb->data && skb_shared(skb)) {
2073 skb->data = skb_head;
2074 skb->len = skb_len;
2075 }
2076drop:
ead2ceb0 2077 consume_skb(skb);
1da177e4
LT		 2078 return 0;
2079}
2080
40d4e3df
ED		 2081static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
2082 struct packet_type *pt, struct net_device *orig_dev)
1da177e4
LT		 2083{
2084 struct sock *sk;
2085 struct packet_sock *po;
2086 struct sockaddr_ll *sll;
184f489e 2087 union tpacket_uhdr h;
40d4e3df 2088 u8 *skb_head = skb->data;
1da177e4 2089 int skb_len = skb->len;
dbcb5855 2090 unsigned int snaplen, res;
f6fb8f10 2091 unsigned long status = TP_STATUS_USER;
bbd6ef87 2092 unsigned short macoff, netoff, hdrlen;
1da177e4 2093 struct sk_buff *copy_skb = NULL;
bbd6ef87 2094 struct timespec ts;
b9c32fb2 2095 __u32 ts_status;
1da177e4 2096
51846355
AW		 2097 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
2098 * We may add members to them until current aligned size without forcing
2099 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
2100 */
2101 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
2102 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
2103
1da177e4
LT		 2104 if (skb->pkt_type == PACKET_LOOPBACK)
2105 goto drop;
2106
2107 sk = pt->af_packet_priv;
2108 po = pkt_sk(sk);
2109
09ad9bc7 2110 if (!net_eq(dev_net(dev), sock_net(sk)))
d12d01d6
DL		 2111 goto drop;
2112
3b04ddde 2113 if (dev->header_ops) {
1da177e4 2114 if (sk->sk_type != SOCK_DGRAM)
98e399f8 2115 skb_push(skb, skb->data - skb_mac_header(skb));
1da177e4
LT		 2116 else if (skb->pkt_type == PACKET_OUTGOING) {
2117 /* Special case: outgoing packets have ll header at head */
bbe735e4 2118 skb_pull(skb, skb_network_offset(skb));
1da177e4
LT		 2119 }
2120 }
2121
2122 snaplen = skb->len;
2123
dbcb5855
DM		 2124 res = run_filter(skb, sk, snaplen);
2125 if (!res)
fda9ef5d 2126 goto drop_n_restore;
68c2e5de
AD		 2127
2128 if (skb->ip_summed == CHECKSUM_PARTIAL)
2129 status |= TP_STATUS_CSUMNOTREADY;
682f048b
AD		 2130 else if (skb->pkt_type != PACKET_OUTGOING &&
2131 (skb->ip_summed == CHECKSUM_COMPLETE ||
2132 skb_csum_unnecessary(skb)))
2133 status |= TP_STATUS_CSUM_VALID;
68c2e5de 2134
dbcb5855
DM		 2135 if (snaplen > res)
2136 snaplen = res;
1da177e4
LT		 2137
2138 if (sk->sk_type == SOCK_DGRAM) {
8913336a
PM		 2139 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
2140 po->tp_reserve;
1da177e4 2141 } else {
95c96174 2142 unsigned int maclen = skb_network_offset(skb);
bbd6ef87 2143 netoff = TPACKET_ALIGN(po->tp_hdrlen +
8913336a
PM		 2144 (maclen < 16 ? 16 : maclen)) +
2145 po->tp_reserve;
1da177e4
LT		 2146 macoff = netoff - maclen;
2147 }
f6fb8f10 2148 if (po->tp_version <= TPACKET_V2) {
2149 if (macoff + snaplen > po->rx_ring.frame_size) {
2150 if (po->copy_thresh &&
0fd7bac6 2151 atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
f6fb8f10 2152 if (skb_shared(skb)) {
2153 copy_skb = skb_clone(skb, GFP_ATOMIC);
2154 } else {
2155 copy_skb = skb_get(skb);
2156 skb_head = skb->data;
2157 }
2158 if (copy_skb)
2159 skb_set_owner_r(copy_skb, sk);
1da177e4 2160 }
f6fb8f10 2161 snaplen = po->rx_ring.frame_size - macoff;
2162 if ((int)snaplen < 0)
2163 snaplen = 0;
1da177e4 2164 }
dc808110
ED		 2165 } else if (unlikely(macoff + snaplen >
2166 GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) {
2167 u32 nval;
2168
2169 nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff;
2170 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
2171 snaplen, nval, macoff);
2172 snaplen = nval;
2173 if (unlikely((int)snaplen < 0)) {
2174 snaplen = 0;
2175 macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len;
2176 }
1da177e4 2177 }
1da177e4 2178 spin_lock(&sk->sk_receive_queue.lock);
f6fb8f10 2179 h.raw = packet_current_rx_frame(po, skb,
2180 TP_STATUS_KERNEL, (macoff+snaplen));
bbd6ef87 2181 if (!h.raw)
1da177e4 2182 goto ring_is_full;
f6fb8f10 2183 if (po->tp_version <= TPACKET_V2) {
2184 packet_increment_rx_head(po, &po->rx_ring);
2185 /*
2186 * LOSING will be reported till you read the stats,
2187 * because it's COR - Clear On Read.
2188 * Anyways, moving it for V1/V2 only as V3 doesn't need this
2189 * at packet level.
2190 */
ee80fbf3 2191 if (po->stats.stats1.tp_drops)
f6fb8f10 2192 status |= TP_STATUS_LOSING;
2193 }
ee80fbf3 2194 po->stats.stats1.tp_packets++;
1da177e4
LT		 2195 if (copy_skb) {
2196 status |= TP_STATUS_COPY;
2197 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
2198 }
1da177e4
LT		 2199 spin_unlock(&sk->sk_receive_queue.lock);
2200
bbd6ef87 2201 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
b9c32fb2
DB		 2202
2203 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
7a51384c 2204 getnstimeofday(&ts);
1da177e4 2205
b9c32fb2
DB		 2206 status |= ts_status;
2207
bbd6ef87
PM		 2208 switch (po->tp_version) {
2209 case TPACKET_V1:
2210 h.h1->tp_len = skb->len;
2211 h.h1->tp_snaplen = snaplen;
2212 h.h1->tp_mac = macoff;
2213 h.h1->tp_net = netoff;
4b457bdf
DB		 2214 h.h1->tp_sec = ts.tv_sec;
2215 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
bbd6ef87
PM		 2216 hdrlen = sizeof(*h.h1);
2217 break;
2218 case TPACKET_V2:
2219 h.h2->tp_len = skb->len;
2220 h.h2->tp_snaplen = snaplen;
2221 h.h2->tp_mac = macoff;
2222 h.h2->tp_net = netoff;
bbd6ef87
PM		 2223 h.h2->tp_sec = ts.tv_sec;
2224 h.h2->tp_nsec = ts.tv_nsec;
df8a39de
JP		 2225 if (skb_vlan_tag_present(skb)) {
2226 h.h2->tp_vlan_tci = skb_vlan_tag_get(skb);
a0cdfcf3
AW		 2227 h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto);
2228 status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
a3bcc23e
BG		 2229 } else {
2230 h.h2->tp_vlan_tci = 0;
a0cdfcf3 2231 h.h2->tp_vlan_tpid = 0;
a3bcc23e 2232 }
e4d26f4b 2233 memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding));
bbd6ef87
PM		 2234 hdrlen = sizeof(*h.h2);
2235 break;
f6fb8f10 2236 case TPACKET_V3:
2237 /* tp_nxt_offset,vlan are already populated above.
2238 * So DONT clear those fields here
2239 */
2240 h.h3->tp_status |= status;
2241 h.h3->tp_len = skb->len;
2242 h.h3->tp_snaplen = snaplen;
2243 h.h3->tp_mac = macoff;
2244 h.h3->tp_net = netoff;
f6fb8f10 2245 h.h3->tp_sec = ts.tv_sec;
2246 h.h3->tp_nsec = ts.tv_nsec;
e4d26f4b 2247 memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding));
f6fb8f10 2248 hdrlen = sizeof(*h.h3);
2249 break;
bbd6ef87
PM		 2250 default:
2251 BUG();
2252 }
1da177e4 2253
bbd6ef87 2254 sll = h.raw + TPACKET_ALIGN(hdrlen);
b95cce35 2255 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
1da177e4
LT		 2256 sll->sll_family = AF_PACKET;
2257 sll->sll_hatype = dev->type;
2258 sll->sll_protocol = skb->protocol;
2259 sll->sll_pkttype = skb->pkt_type;
8032b464 2260 if (unlikely(po->origdev))
80feaacb
PWJ		 2261 sll->sll_ifindex = orig_dev->ifindex;
2262 else
2263 sll->sll_ifindex = dev->ifindex;
1da177e4 2264
e16aa207 2265 smp_mb();
f0d4eb29 2266
f6dafa95 2267#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
f0d4eb29 2268 if (po->tp_version <= TPACKET_V2) {
0af55bb5
CG		 2269 u8 *start, *end;
2270
f0d4eb29
DB		 2271 end = (u8 *) PAGE_ALIGN((unsigned long) h.raw +
2272 macoff + snaplen);
2273
2274 for (start = h.raw; start < end; start += PAGE_SIZE)
2275 flush_dcache_page(pgv_to_page(start));
1da177e4 2276 }
f0d4eb29 2277 smp_wmb();
f6dafa95 2278#endif
f0d4eb29 2279
da413eec 2280 if (po->tp_version <= TPACKET_V2) {
f6fb8f10 2281 __packet_set_status(po, h.raw, status);
da413eec
DC		 2282 sk->sk_data_ready(sk);
2283 } else {
f6fb8f10 2284 prb_clear_blk_fill_status(&po->rx_ring);
da413eec 2285 }
1da177e4
LT		 2286
2287drop_n_restore:
2288 if (skb_head != skb->data && skb_shared(skb)) {
2289 skb->data = skb_head;
2290 skb->len = skb_len;
2291 }
2292drop:
1ce4f28b 2293 kfree_skb(skb);
1da177e4
LT		 2294 return 0;
2295
2296ring_is_full:
ee80fbf3 2297 po->stats.stats1.tp_drops++;
1da177e4
LT		 2298 spin_unlock(&sk->sk_receive_queue.lock);
2299
676d2369 2300 sk->sk_data_ready(sk);
acb5d75b 2301 kfree_skb(copy_skb);
1da177e4
LT		 2302 goto drop_n_restore;
2303}
2304
69e3c75f
JB		 2305static void tpacket_destruct_skb(struct sk_buff *skb)
2306{
2307 struct packet_sock *po = pkt_sk(skb->sk);
1da177e4 2308
69e3c75f 2309 if (likely(po->tx_ring.pg_vec)) {
f0d4eb29 2310 void *ph;
b9c32fb2
DB		 2311 __u32 ts;
2312
69e3c75f 2313 ph = skb_shinfo(skb)->destructor_arg;
b0138408 2314 packet_dec_pending(&po->tx_ring);
b9c32fb2
DB		 2315
2316 ts = __packet_set_timestamp(po, ph, skb);
2317 __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts);
69e3c75f
JB		 2318 }
2319
2320 sock_wfree(skb);
2321}
2322
9c707762
WB		 2323static bool ll_header_truncated(const struct net_device *dev, int len)
2324{
2325 /* net device doesn't like empty head */
2326 if (unlikely(len <= dev->hard_header_len)) {
eee2f04b 2327 net_warn_ratelimited("%s: packet size is too short (%d <= %d)\n",
9c707762
WB		 2328 current->comm, len, dev->hard_header_len);
2329 return true;
2330 }
2331
2332 return false;
2333}
2334
40d4e3df
ED		 2335static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
2336 void *frame, struct net_device *dev, int size_max,
ae641949 2337 __be16 proto, unsigned char *addr, int hlen)
69e3c75f 2338{
184f489e 2339 union tpacket_uhdr ph;
09effa67 2340 int to_write, offset, len, tp_len, nr_frags, len_max;
69e3c75f
JB		 2341 struct socket *sock = po->sk.sk_socket;
2342 struct page *page;
2343 void *data;
2344 int err;
2345
2346 ph.raw = frame;
2347
2348 skb->protocol = proto;
2349 skb->dev = dev;
2350 skb->priority = po->sk.sk_priority;
2d37a186 2351 skb->mark = po->sk.sk_mark;
2e31396f 2352 sock_tx_timestamp(&po->sk, &skb_shinfo(skb)->tx_flags);
69e3c75f
JB		 2353 skb_shinfo(skb)->destructor_arg = ph.raw;
2354
2355 switch (po->tp_version) {
2356 case TPACKET_V2:
2357 tp_len = ph.h2->tp_len;
2358 break;
2359 default:
2360 tp_len = ph.h1->tp_len;
2361 break;
2362 }
09effa67
DM		 2363 if (unlikely(tp_len > size_max)) {
2364 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
2365 return -EMSGSIZE;
2366 }
69e3c75f 2367
ae641949 2368 skb_reserve(skb, hlen);
69e3c75f 2369 skb_reset_network_header(skb);
c1aad275 2370
d346a3fa
DB		 2371 if (!packet_use_direct_xmit(po))
2372 skb_probe_transport_header(skb, 0);
2373 if (unlikely(po->tp_tx_has_off)) {
5920cd3a
PC		 2374 int off_min, off_max, off;
2375 off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2376 off_max = po->tx_ring.frame_size - tp_len;
2377 if (sock->type == SOCK_DGRAM) {
2378 switch (po->tp_version) {
2379 case TPACKET_V2:
2380 off = ph.h2->tp_net;
2381 break;
2382 default:
2383 off = ph.h1->tp_net;
2384 break;
2385 }
2386 } else {
2387 switch (po->tp_version) {
2388 case TPACKET_V2:
2389 off = ph.h2->tp_mac;
2390 break;
2391 default:
2392 off = ph.h1->tp_mac;
2393 break;
2394 }
2395 }
2396 if (unlikely((off < off_min) || (off_max < off)))
2397 return -EINVAL;
2398 data = ph.raw + off;
2399 } else {
2400 data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
2401 }
69e3c75f
JB		 2402 to_write = tp_len;
2403
2404 if (sock->type == SOCK_DGRAM) {
2405 err = dev_hard_header(skb, dev, ntohs(proto), addr,
2406 NULL, tp_len);
2407 if (unlikely(err < 0))
2408 return -EINVAL;
40d4e3df 2409 } else if (dev->hard_header_len) {
9c707762 2410 if (ll_header_truncated(dev, tp_len))
69e3c75f 2411 return -EINVAL;
69e3c75f
JB		 2412
2413 skb_push(skb, dev->hard_header_len);
2414 err = skb_store_bits(skb, 0, data,
2415 dev->hard_header_len);
2416 if (unlikely(err))
2417 return err;
2418
2419 data += dev->hard_header_len;
2420 to_write -= dev->hard_header_len;
2421 }
2422
69e3c75f
JB		 2423 offset = offset_in_page(data);
2424 len_max = PAGE_SIZE - offset;
2425 len = ((to_write > len_max) ? len_max : to_write);
2426
2427 skb->data_len = to_write;
2428 skb->len += to_write;
2429 skb->truesize += to_write;
2430 atomic_add(to_write, &po->sk.sk_wmem_alloc);
2431
2432 while (likely(to_write)) {
2433 nr_frags = skb_shinfo(skb)->nr_frags;
2434
2435 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
40d4e3df
ED		 2436 pr_err("Packet exceed the number of skb frags(%lu)\n",
2437 MAX_SKB_FRAGS);
69e3c75f
JB		 2438 return -EFAULT;
2439 }
2440
0af55bb5
CG		 2441 page = pgv_to_page(data);
2442 data += len;
69e3c75f
JB		 2443 flush_dcache_page(page);
2444 get_page(page);
0af55bb5 2445 skb_fill_page_desc(skb, nr_frags, page, offset, len);
69e3c75f
JB		 2446 to_write -= len;
2447 offset = 0;
2448 len_max = PAGE_SIZE;
2449 len = ((to_write > len_max) ? len_max : to_write);
2450 }
2451
2452 return tp_len;
2453}
2454
2455static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
2456{
69e3c75f
JB		 2457 struct sk_buff *skb;
2458 struct net_device *dev;
2459 __be16 proto;
09effa67 2460 int err, reserve = 0;
40d4e3df 2461 void *ph;
342dfc30 2462 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
87a2fd28 2463 bool need_wait = !(msg->msg_flags & MSG_DONTWAIT);
69e3c75f
JB		 2464 int tp_len, size_max;
2465 unsigned char *addr;
2466 int len_sum = 0;
9e67030a 2467 int status = TP_STATUS_AVAILABLE;
ae641949 2468 int hlen, tlen;
69e3c75f 2469
69e3c75f
JB		 2470 mutex_lock(&po->pg_vec_lock);
2471
66e56cd4 2472 if (likely(saddr == NULL)) {
e40526cb 2473 dev = packet_cached_dev_get(po);
69e3c75f
JB		 2474 proto = po->num;
2475 addr = NULL;
2476 } else {
2477 err = -EINVAL;
2478 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2479 goto out;
2480 if (msg->msg_namelen < (saddr->sll_halen
2481 + offsetof(struct sockaddr_ll,
2482 sll_addr)))
2483 goto out;
69e3c75f
JB		 2484 proto = saddr->sll_protocol;
2485 addr = saddr->sll_addr;
827d9780 2486 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
69e3c75f
JB		 2487 }
2488
69e3c75f
JB		 2489 err = -ENXIO;
2490 if (unlikely(dev == NULL))
2491 goto out;
69e3c75f
JB		 2492 err = -ENETDOWN;
2493 if (unlikely(!(dev->flags & IFF_UP)))
2494 goto out_put;
2495
52f1454f 2496 reserve = dev->hard_header_len + VLAN_HLEN;
69e3c75f 2497 size_max = po->tx_ring.frame_size
b5dd884e 2498 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
69e3c75f 2499
09effa67
DM		 2500 if (size_max > dev->mtu + reserve)
2501 size_max = dev->mtu + reserve;
2502
69e3c75f
JB		 2503 do {
2504 ph = packet_current_frame(po, &po->tx_ring,
87a2fd28 2505 TP_STATUS_SEND_REQUEST);
69e3c75f 2506 if (unlikely(ph == NULL)) {
87a2fd28
DB		 2507 if (need_wait && need_resched())
2508 schedule();
69e3c75f
JB		 2509 continue;
2510 }
2511
2512 status = TP_STATUS_SEND_REQUEST;
ae641949
HX		 2513 hlen = LL_RESERVED_SPACE(dev);
2514 tlen = dev->needed_tailroom;
69e3c75f 2515 skb = sock_alloc_send_skb(&po->sk,
ae641949 2516 hlen + tlen + sizeof(struct sockaddr_ll),
fbf33a28 2517 !need_wait, &err);
69e3c75f 2518
fbf33a28
KM		 2519 if (unlikely(skb == NULL)) {
2520 /* we assume the socket was initially writeable ... */
2521 if (likely(len_sum > 0))
2522 err = len_sum;
69e3c75f 2523 goto out_status;
fbf33a28 2524 }
69e3c75f 2525 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
52f1454f 2526 addr, hlen);
dbd46ab4
AD		 2527 if (likely(tp_len >= 0) &&
2528 tp_len > dev->mtu + dev->hard_header_len) {
52f1454f
DB		 2529 struct ethhdr *ehdr;
2530 /* Earlier code assumed this would be a VLAN pkt,
2531 * double-check this now that we have the actual
2532 * packet in hand.
2533 */
69e3c75f 2534
52f1454f
DB		 2535 skb_reset_mac_header(skb);
2536 ehdr = eth_hdr(skb);
2537 if (ehdr->h_proto != htons(ETH_P_8021Q))
2538 tp_len = -EMSGSIZE;
2539 }
69e3c75f
JB		 2540 if (unlikely(tp_len < 0)) {
2541 if (po->tp_loss) {
2542 __packet_set_status(po, ph,
2543 TP_STATUS_AVAILABLE);
2544 packet_increment_head(&po->tx_ring);
2545 kfree_skb(skb);
2546 continue;
2547 } else {
2548 status = TP_STATUS_WRONG_FORMAT;
2549 err = tp_len;
2550 goto out_status;
2551 }
2552 }
2553
0fd5d57b
DB		 2554 packet_pick_tx_queue(dev, skb);
2555
69e3c75f
JB		 2556 skb->destructor = tpacket_destruct_skb;
2557 __packet_set_status(po, ph, TP_STATUS_SENDING);
b0138408 2558 packet_inc_pending(&po->tx_ring);
69e3c75f
JB		 2559
2560 status = TP_STATUS_SEND_REQUEST;
d346a3fa 2561 err = po->xmit(skb);
eb70df13
JP		 2562 if (unlikely(err > 0)) {
2563 err = net_xmit_errno(err);
2564 if (err && __packet_get_status(po, ph) ==
2565 TP_STATUS_AVAILABLE) {
2566 /* skb was destructed already */
2567 skb = NULL;
2568 goto out_status;
2569 }
2570 /*
2571 * skb was dropped but not destructed yet;
2572 * let's treat it like congestion or err < 0
2573 */
2574 err = 0;
2575 }
69e3c75f
JB		 2576 packet_increment_head(&po->tx_ring);
2577 len_sum += tp_len;
b0138408
DB		 2578 } while (likely((ph != NULL) ||
2579 /* Note: packet_read_pending() might be slow if we have
2580 * to call it as it's per_cpu variable, but in fast-path
2581 * we already short-circuit the loop with the first
2582 * condition, and luckily don't have to go that path
2583 * anyway.
2584 */
2585 (need_wait && packet_read_pending(&po->tx_ring))));
69e3c75f
JB		 2586
2587 err = len_sum;
2588 goto out_put;
2589
69e3c75f
JB		 2590out_status:
2591 __packet_set_status(po, ph, status);
2592 kfree_skb(skb);
2593out_put:
e40526cb 2594 dev_put(dev);
69e3c75f
JB		 2595out:
2596 mutex_unlock(&po->pg_vec_lock);
2597 return err;
2598}
69e3c75f 2599
eea49cc9
OJ		 2600static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
2601 size_t reserve, size_t len,
2602 size_t linear, int noblock,
2603 int *err)
bfd5f4a3
SS		 2604{
2605 struct sk_buff *skb;
2606
2607 /* Under a page? Don't bother with paged skb. */
2608 if (prepad + len < PAGE_SIZE || !linear)
2609 linear = len;
2610
2611 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
28d64271 2612 err, 0);
bfd5f4a3
SS		 2613 if (!skb)
2614 return NULL;
2615
2616 skb_reserve(skb, reserve);
2617 skb_put(skb, linear);
2618 skb->data_len = len - linear;
2619 skb->len += len - linear;
2620
2621 return skb;
2622}
2623
d346a3fa 2624static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
1da177e4
LT		 2625{
2626 struct sock *sk = sock->sk;
342dfc30 2627 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
1da177e4
LT		 2628 struct sk_buff *skb;
2629 struct net_device *dev;
0e11c91e 2630 __be16 proto;
1da177e4 2631 unsigned char *addr;
827d9780 2632 int err, reserve = 0;
bfd5f4a3
SS		 2633 struct virtio_net_hdr vnet_hdr = { 0 };
2634 int offset = 0;
2635 int vnet_hdr_len;
2636 struct packet_sock *po = pkt_sk(sk);
2637 unsigned short gso_type = 0;
ae641949 2638 int hlen, tlen;
3bdc0eba 2639 int extra_len = 0;
8feb2fb2 2640 ssize_t n;
1da177e4
LT		 2641
2642 /*
1ce4f28b 2643 * Get and verify the address.
1da177e4 2644 */
1ce4f28b 2645
66e56cd4 2646 if (likely(saddr == NULL)) {
e40526cb 2647 dev = packet_cached_dev_get(po);
1da177e4
LT		 2648 proto = po->num;
2649 addr = NULL;
2650 } else {
2651 err = -EINVAL;
2652 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2653 goto out;
0fb375fb
EB		 2654 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
2655 goto out;
1da177e4
LT		 2656 proto = saddr->sll_protocol;
2657 addr = saddr->sll_addr;
827d9780 2658 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
1da177e4
LT		 2659 }
2660
1da177e4 2661 err = -ENXIO;
e40526cb 2662 if (unlikely(dev == NULL))
1da177e4 2663 goto out_unlock;
d5e76b0a 2664 err = -ENETDOWN;
e40526cb 2665 if (unlikely(!(dev->flags & IFF_UP)))
d5e76b0a
DM		 2666 goto out_unlock;
2667
e40526cb
DB		 2668 if (sock->type == SOCK_RAW)
2669 reserve = dev->hard_header_len;
bfd5f4a3
SS		 2670 if (po->has_vnet_hdr) {
2671 vnet_hdr_len = sizeof(vnet_hdr);
2672
2673 err = -EINVAL;
2674 if (len < vnet_hdr_len)
2675 goto out_unlock;
2676
2677 len -= vnet_hdr_len;
2678
8feb2fb2 2679 err = -EFAULT;
c0371da6 2680 n = copy_from_iter(&vnet_hdr, vnet_hdr_len, &msg->msg_iter);
8feb2fb2 2681 if (n != vnet_hdr_len)
bfd5f4a3
SS		 2682 goto out_unlock;
2683
2684 if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
d3869efe
DW		 2685 (__virtio16_to_cpu(vio_le(), vnet_hdr.csum_start) +
2686 __virtio16_to_cpu(vio_le(), vnet_hdr.csum_offset) + 2 >
2687 __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len)))
2688 vnet_hdr.hdr_len = __cpu_to_virtio16(vio_le(),
2689 __virtio16_to_cpu(vio_le(), vnet_hdr.csum_start) +
2690 __virtio16_to_cpu(vio_le(), vnet_hdr.csum_offset) + 2);
bfd5f4a3
SS		 2691
2692 err = -EINVAL;
d3869efe 2693 if (__virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len) > len)
bfd5f4a3
SS		 2694 goto out_unlock;
2695
2696 if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2697 switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2698 case VIRTIO_NET_HDR_GSO_TCPV4:
2699 gso_type = SKB_GSO_TCPV4;
2700 break;
2701 case VIRTIO_NET_HDR_GSO_TCPV6:
2702 gso_type = SKB_GSO_TCPV6;
2703 break;
2704 case VIRTIO_NET_HDR_GSO_UDP:
2705 gso_type = SKB_GSO_UDP;
2706 break;
2707 default:
2708 goto out_unlock;
2709 }
2710
2711 if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
2712 gso_type |= SKB_GSO_TCP_ECN;
2713
2714 if (vnet_hdr.gso_size == 0)
2715 goto out_unlock;
2716
2717 }
2718 }
2719
3bdc0eba
BG		 2720 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
2721 if (!netif_supports_nofcs(dev)) {
2722 err = -EPROTONOSUPPORT;
2723 goto out_unlock;
2724 }
2725 extra_len = 4; /* We're doing our own CRC */
2726 }
2727
1da177e4 2728 err = -EMSGSIZE;
3bdc0eba 2729 if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN + extra_len))
1da177e4
LT		 2730 goto out_unlock;
2731
bfd5f4a3 2732 err = -ENOBUFS;
ae641949
HX		 2733 hlen = LL_RESERVED_SPACE(dev);
2734 tlen = dev->needed_tailroom;
dc9e5153 2735 skb = packet_alloc_skb(sk, hlen + tlen, hlen, len,
d3869efe 2736 __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len),
bfd5f4a3 2737 msg->msg_flags & MSG_DONTWAIT, &err);
40d4e3df 2738 if (skb == NULL)
1da177e4
LT		 2739 goto out_unlock;
2740
bfd5f4a3 2741 skb_set_network_header(skb, reserve);
1da177e4 2742
0c4e8581 2743 err = -EINVAL;
9c707762
WB		 2744 if (sock->type == SOCK_DGRAM) {
2745 offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len);
46d2cfb1 2746 if (unlikely(offset < 0))
9c707762
WB		 2747 goto out_free;
2748 } else {
2749 if (ll_header_truncated(dev, len))
2750 goto out_free;
2751 }
1da177e4
LT		 2752
2753 /* Returns -EFAULT on error */
c0371da6 2754 err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len);
1da177e4
LT		 2755 if (err)
2756 goto out_free;
bf84a010
DB		 2757
2758 sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
1da177e4 2759
3bdc0eba 2760 if (!gso_type && (len > dev->mtu + reserve + extra_len)) {
09effa67
DM		 2761 /* Earlier code assumed this would be a VLAN pkt,
2762 * double-check this now that we have the actual
2763 * packet in hand.
2764 */
2765 struct ethhdr *ehdr;
2766 skb_reset_mac_header(skb);
2767 ehdr = eth_hdr(skb);
2768 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
2769 err = -EMSGSIZE;
2770 goto out_free;
2771 }
57f89bfa
BG		 2772 }
2773
09effa67
DM		 2774 skb->protocol = proto;
2775 skb->dev = dev;
1da177e4 2776 skb->priority = sk->sk_priority;
2d37a186 2777 skb->mark = sk->sk_mark;
0fd5d57b
DB		 2778
2779 packet_pick_tx_queue(dev, skb);
1da177e4 2780
bfd5f4a3
SS		 2781 if (po->has_vnet_hdr) {
2782 if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
d3869efe
DW		 2783 u16 s = __virtio16_to_cpu(vio_le(), vnet_hdr.csum_start);
2784 u16 o = __virtio16_to_cpu(vio_le(), vnet_hdr.csum_offset);
dc9e5153 2785 if (!skb_partial_csum_set(skb, s, o)) {
bfd5f4a3
SS		 2786 err = -EINVAL;
2787 goto out_free;
2788 }
2789 }
2790
dc9e5153 2791 skb_shinfo(skb)->gso_size =
d3869efe 2792 __virtio16_to_cpu(vio_le(), vnet_hdr.gso_size);
bfd5f4a3
SS		 2793 skb_shinfo(skb)->gso_type = gso_type;
2794
2795 /* Header must be checked, and gso_segs computed. */
2796 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2797 skb_shinfo(skb)->gso_segs = 0;
2798
2799 len += vnet_hdr_len;
2800 }
2801
d346a3fa
DB		 2802 if (!packet_use_direct_xmit(po))
2803 skb_probe_transport_header(skb, reserve);
3bdc0eba
BG		 2804 if (unlikely(extra_len == 4))
2805 skb->no_fcs = 1;
2806
d346a3fa 2807 err = po->xmit(skb);
1da177e4
LT		 2808 if (err > 0 && (err = net_xmit_errno(err)) != 0)
2809 goto out_unlock;
2810
e40526cb 2811 dev_put(dev);
1da177e4 2812
40d4e3df 2813 return len;
1da177e4
LT		 2814
2815out_free:
2816 kfree_skb(skb);
2817out_unlock:
e40526cb 2818 if (dev)
1da177e4
LT		 2819 dev_put(dev);
2820out:
2821 return err;
2822}
2823
1b784140 2824static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
69e3c75f 2825{
69e3c75f
JB		 2826 struct sock *sk = sock->sk;
2827 struct packet_sock *po = pkt_sk(sk);
d346a3fa 2828
69e3c75f
JB		 2829 if (po->tx_ring.pg_vec)
2830 return tpacket_snd(po, msg);
2831 else
69e3c75f
JB		 2832 return packet_snd(sock, msg, len);
2833}
2834
1da177e4
LT		 2835/*
2836 * Close a PACKET socket. This is fairly simple. We immediately go
2837 * to 'closed' state and remove our protocol entry in the device list.
2838 */
2839
2840static int packet_release(struct socket *sock)
2841{
2842 struct sock *sk = sock->sk;
2843 struct packet_sock *po;
d12d01d6 2844 struct net *net;
f6fb8f10 2845 union tpacket_req_u req_u;
1da177e4
LT		 2846
2847 if (!sk)
2848 return 0;
2849
3b1e0a65 2850 net = sock_net(sk);
1da177e4
LT		 2851 po = pkt_sk(sk);
2852
0fa7fa98 2853 mutex_lock(&net->packet.sklist_lock);
808f5114 2854 sk_del_node_init_rcu(sk);
0fa7fa98
PE		 2855 mutex_unlock(&net->packet.sklist_lock);
2856
2857 preempt_disable();
920de804 2858 sock_prot_inuse_add(net, sk->sk_prot, -1);
0fa7fa98 2859 preempt_enable();
1da177e4 2860
808f5114 2861 spin_lock(&po->bind_lock);
ce06b03e 2862 unregister_prot_hook(sk, false);
66e56cd4
DB		 2863 packet_cached_dev_reset(po);
2864
160ff18a
BG		 2865 if (po->prot_hook.dev) {
2866 dev_put(po->prot_hook.dev);
2867 po->prot_hook.dev = NULL;
2868 }
808f5114 2869 spin_unlock(&po->bind_lock);
1da177e4 2870
1da177e4 2871 packet_flush_mclist(sk);
1da177e4 2872
9665d5d6
PS		 2873 if (po->rx_ring.pg_vec) {
2874 memset(&req_u, 0, sizeof(req_u));
f6fb8f10 2875 packet_set_ring(sk, &req_u, 1, 0);
9665d5d6 2876 }
69e3c75f 2877
9665d5d6
PS		 2878 if (po->tx_ring.pg_vec) {
2879 memset(&req_u, 0, sizeof(req_u));
f6fb8f10 2880 packet_set_ring(sk, &req_u, 1, 1);
9665d5d6 2881 }
1da177e4 2882
dc99f600
DM		 2883 fanout_release(sk);
2884
808f5114 2885 synchronize_net();
1da177e4
LT		 2886 /*
2887 * Now the socket is dead. No more input will appear.
2888 */
1da177e4
LT		 2889 sock_orphan(sk);
2890 sock->sk = NULL;
2891
2892 /* Purge queues */
2893
2894 skb_queue_purge(&sk->sk_receive_queue);
b0138408 2895 packet_free_pending(po);
17ab56a2 2896 sk_refcnt_debug_release(sk);
1da177e4
LT		 2897
2898 sock_put(sk);
2899 return 0;
2900}
2901
2902/*
2903 * Attach a packet hook.
2904 */
2905
902fefb8 2906static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 proto)
1da177e4
LT		 2907{
2908 struct packet_sock *po = pkt_sk(sk);
158cd4af 2909 struct net_device *dev_curr;
902fefb8
DB		 2910 __be16 proto_curr;
2911 bool need_rehook;
dc99f600 2912
aef950b4
WY		 2913 if (po->fanout) {
2914 if (dev)
2915 dev_put(dev);
2916
dc99f600 2917 return -EINVAL;
aef950b4 2918 }
1da177e4
LT		 2919
2920 lock_sock(sk);
1da177e4 2921 spin_lock(&po->bind_lock);
66e56cd4 2922
902fefb8
DB		 2923 proto_curr = po->prot_hook.type;
2924 dev_curr = po->prot_hook.dev;
2925
2926 need_rehook = proto_curr != proto || dev_curr != dev;
2927
2928 if (need_rehook) {
2929 unregister_prot_hook(sk, true);
1da177e4 2930
902fefb8
DB		 2931 po->num = proto;
2932 po->prot_hook.type = proto;
902fefb8
DB		 2933 po->prot_hook.dev = dev;
2934
2935 po->ifindex = dev ? dev->ifindex : 0;
2936 packet_cached_dev_assign(po, dev);
2937 }
158cd4af
LW		 2938 if (dev_curr)
2939 dev_put(dev_curr);
66e56cd4 2940
902fefb8 2941 if (proto == 0 || !need_rehook)
1da177e4
LT		 2942 goto out_unlock;
2943
be85d4ad 2944 if (!dev || (dev->flags & IFF_UP)) {
ce06b03e 2945 register_prot_hook(sk);
be85d4ad
UT		 2946 } else {
2947 sk->sk_err = ENETDOWN;
2948 if (!sock_flag(sk, SOCK_DEAD))
2949 sk->sk_error_report(sk);
1da177e4
LT		 2950 }
2951
2952out_unlock:
2953 spin_unlock(&po->bind_lock);
2954 release_sock(sk);
2955 return 0;
2956}
2957
2958/*
2959 * Bind a packet socket to a device
2960 */
2961
40d4e3df
ED		 2962static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
2963 int addr_len)
1da177e4 2964{
40d4e3df 2965 struct sock *sk = sock->sk;
1da177e4
LT		 2966 char name[15];
2967 struct net_device *dev;
2968 int err = -ENODEV;
1ce4f28b 2969
1da177e4
LT		 2970 /*
2971 * Check legality
2972 */
1ce4f28b 2973
8ae55f04 2974 if (addr_len != sizeof(struct sockaddr))
1da177e4 2975 return -EINVAL;
40d4e3df 2976 strlcpy(name, uaddr->sa_data, sizeof(name));
1da177e4 2977
3b1e0a65 2978 dev = dev_get_by_name(sock_net(sk), name);
160ff18a 2979 if (dev)
1da177e4 2980 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
1da177e4
LT		 2981 return err;
2982}
1da177e4
LT		 2983
2984static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
2985{
40d4e3df
ED		 2986 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
2987 struct sock *sk = sock->sk;
1da177e4
LT		 2988 struct net_device *dev = NULL;
2989 int err;
2990
2991
2992 /*
2993 * Check legality
2994 */
1ce4f28b 2995
1da177e4
LT		 2996 if (addr_len < sizeof(struct sockaddr_ll))
2997 return -EINVAL;
2998 if (sll->sll_family != AF_PACKET)
2999 return -EINVAL;
3000
3001 if (sll->sll_ifindex) {
3002 err = -ENODEV;
3b1e0a65 3003 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
1da177e4
LT		 3004 if (dev == NULL)
3005 goto out;
3006 }
3007 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
1da177e4
LT		 3008
3009out:
3010 return err;
3011}
3012
3013static struct proto packet_proto = {
3014 .name = "PACKET",
3015 .owner = THIS_MODULE,
3016 .obj_size = sizeof(struct packet_sock),
3017};
3018
3019/*
1ce4f28b 3020 * Create a packet of type SOCK_PACKET.
1da177e4
LT		 3021 */
3022
3f378b68
EP		 3023static int packet_create(struct net *net, struct socket *sock, int protocol,
3024 int kern)
1da177e4
LT		 3025{
3026 struct sock *sk;
3027 struct packet_sock *po;
0e11c91e 3028 __be16 proto = (__force __be16)protocol; /* weird, but documented */
1da177e4
LT		 3029 int err;
3030
df008c91 3031 if (!ns_capable(net->user_ns, CAP_NET_RAW))
1da177e4 3032 return -EPERM;
be02097c
DM		 3033 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
3034 sock->type != SOCK_PACKET)
1da177e4
LT		 3035 return -ESOCKTNOSUPPORT;
3036
3037 sock->state = SS_UNCONNECTED;
3038
3039 err = -ENOBUFS;
11aa9c28 3040 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto, kern);
1da177e4
LT		 3041 if (sk == NULL)
3042 goto out;
3043
3044 sock->ops = &packet_ops;
1da177e4
LT		 3045 if (sock->type == SOCK_PACKET)
3046 sock->ops = &packet_ops_spkt;
be02097c 3047
1da177e4
LT		 3048 sock_init_data(sock, sk);
3049
3050 po = pkt_sk(sk);
3051 sk->sk_family = PF_PACKET;
0e11c91e 3052 po->num = proto;
d346a3fa 3053 po->xmit = dev_queue_xmit;
66e56cd4 3054
b0138408
DB		 3055 err = packet_alloc_pending(po);
3056 if (err)
3057 goto out2;
3058
66e56cd4 3059 packet_cached_dev_reset(po);
1da177e4
LT		 3060
3061 sk->sk_destruct = packet_sock_destruct;
17ab56a2 3062 sk_refcnt_debug_inc(sk);
1da177e4
LT		 3063
3064 /*
3065 * Attach a protocol block
3066 */
3067
3068 spin_lock_init(&po->bind_lock);
905db440 3069 mutex_init(&po->pg_vec_lock);
0648ab70 3070 po->rollover = NULL;
1da177e4 3071 po->prot_hook.func = packet_rcv;
be02097c 3072
1da177e4
LT		 3073 if (sock->type == SOCK_PACKET)
3074 po->prot_hook.func = packet_rcv_spkt;
be02097c 3075
1da177e4
LT		 3076 po->prot_hook.af_packet_priv = sk;
3077
0e11c91e
AV		 3078 if (proto) {
3079 po->prot_hook.type = proto;
ce06b03e 3080 register_prot_hook(sk);
1da177e4
LT		 3081 }
3082
0fa7fa98 3083 mutex_lock(&net->packet.sklist_lock);
808f5114 3084 sk_add_node_rcu(sk, &net->packet.sklist);
0fa7fa98
PE		 3085 mutex_unlock(&net->packet.sklist_lock);
3086
3087 preempt_disable();
3680453c 3088 sock_prot_inuse_add(net, &packet_proto, 1);
0fa7fa98 3089 preempt_enable();
808f5114 3090
40d4e3df 3091 return 0;
b0138408
DB		 3092out2:
3093 sk_free(sk);
1da177e4
LT		 3094out:
3095 return err;
3096}
3097
3098/*
3099 * Pull a packet from our receive queue and hand it to the user.
3100 * If necessary we block.
3101 */
3102
1b784140
YX		 3103static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3104 int flags)
1da177e4
LT		 3105{
3106 struct sock *sk = sock->sk;
3107 struct sk_buff *skb;
3108 int copied, err;
bfd5f4a3 3109 int vnet_hdr_len = 0;
2472d761 3110 unsigned int origlen = 0;
1da177e4
LT		 3111
3112 err = -EINVAL;
ed85b565 3113 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
1da177e4
LT		 3114 goto out;
3115
3116#if 0
3117 /* What error should we return now? EUNATTACH? */
3118 if (pkt_sk(sk)->ifindex < 0)
3119 return -ENODEV;
3120#endif
3121
ed85b565 3122 if (flags & MSG_ERRQUEUE) {
cb820f8e
RC		 3123 err = sock_recv_errqueue(sk, msg, len,
3124 SOL_PACKET, PACKET_TX_TIMESTAMP);
ed85b565
RC		 3125 goto out;
3126 }
3127
1da177e4
LT		 3128 /*
3129 * Call the generic datagram receiver. This handles all sorts
3130 * of horrible races and re-entrancy so we can forget about it
3131 * in the protocol layers.
3132 *
3133 * Now it will return ENETDOWN, if device have just gone down,
3134 * but then it will block.
3135 */
3136
40d4e3df 3137 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
1da177e4
LT		 3138
3139 /*
1ce4f28b 3140 * An error occurred so return it. Because skb_recv_datagram()
1da177e4
LT		 3141 * handles the blocking we don't see and worry about blocking
3142 * retries.
3143 */
3144
8ae55f04 3145 if (skb == NULL)
1da177e4
LT		 3146 goto out;
3147
2ccdbaa6
WB		 3148 if (pkt_sk(sk)->pressure)
3149 packet_rcv_has_room(pkt_sk(sk), NULL);
3150
bfd5f4a3
SS		 3151 if (pkt_sk(sk)->has_vnet_hdr) {
3152 struct virtio_net_hdr vnet_hdr = { 0 };
3153
3154 err = -EINVAL;
3155 vnet_hdr_len = sizeof(vnet_hdr);
1f18b717 3156 if (len < vnet_hdr_len)
bfd5f4a3
SS		 3157 goto out_free;
3158
1f18b717
MK		 3159 len -= vnet_hdr_len;
3160
bfd5f4a3
SS		 3161 if (skb_is_gso(skb)) {
3162 struct skb_shared_info *sinfo = skb_shinfo(skb);
3163
3164 /* This is a hint as to how much should be linear. */
dc9e5153 3165 vnet_hdr.hdr_len =
d3869efe 3166 __cpu_to_virtio16(vio_le(), skb_headlen(skb));
dc9e5153 3167 vnet_hdr.gso_size =
d3869efe 3168 __cpu_to_virtio16(vio_le(), sinfo->gso_size);
bfd5f4a3
SS		 3169 if (sinfo->gso_type & SKB_GSO_TCPV4)
3170 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
3171 else if (sinfo->gso_type & SKB_GSO_TCPV6)
3172 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
3173 else if (sinfo->gso_type & SKB_GSO_UDP)
3174 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
3175 else if (sinfo->gso_type & SKB_GSO_FCOE)
3176 goto out_free;
3177 else
3178 BUG();
3179 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
3180 vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
3181 } else
3182 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
3183
3184 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3185 vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
d3869efe 3186 vnet_hdr.csum_start = __cpu_to_virtio16(vio_le(),
dc9e5153 3187 skb_checksum_start_offset(skb));
d3869efe 3188 vnet_hdr.csum_offset = __cpu_to_virtio16(vio_le(),
dc9e5153 3189 skb->csum_offset);
10a8d94a
JW		 3190 } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
3191 vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID;
bfd5f4a3
SS		 3192 } /* else everything is zero */
3193
7eab8d9e 3194 err = memcpy_to_msg(msg, (void *)&vnet_hdr, vnet_hdr_len);
bfd5f4a3
SS		 3195 if (err < 0)
3196 goto out_free;
3197 }
3198
f3d33426
HFS		 3199 /* You lose any data beyond the buffer you gave. If it worries
3200 * a user program they can ask the device for its MTU
3201 * anyway.
1da177e4 3202 */
1da177e4 3203 copied = skb->len;
40d4e3df
ED		 3204 if (copied > len) {
3205 copied = len;
3206 msg->msg_flags |= MSG_TRUNC;
1da177e4
LT		 3207 }
3208
51f3d02b 3209 err = skb_copy_datagram_msg(skb, 0, msg, copied);
1da177e4
LT		 3210 if (err)
3211 goto out_free;
3212
2472d761
EB		 3213 if (sock->type != SOCK_PACKET) {
3214 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3215
3216 /* Original length was stored in sockaddr_ll fields */
3217 origlen = PACKET_SKB_CB(skb)->sa.origlen;
3218 sll->sll_family = AF_PACKET;
3219 sll->sll_protocol = skb->protocol;
3220 }
3221
3b885787 3222 sock_recv_ts_and_drops(msg, sk, skb);
1da177e4 3223
f3d33426
HFS		 3224 if (msg->msg_name) {
3225 /* If the address length field is there to be filled
3226 * in, we fill it in now.
3227 */
3228 if (sock->type == SOCK_PACKET) {
342dfc30 3229 __sockaddr_check_size(sizeof(struct sockaddr_pkt));
f3d33426
HFS		 3230 msg->msg_namelen = sizeof(struct sockaddr_pkt);
3231 } else {
3232 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
2472d761 3233
f3d33426
HFS		 3234 msg->msg_namelen = sll->sll_halen +
3235 offsetof(struct sockaddr_ll, sll_addr);
3236 }
ffbc6111
HX		 3237 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
3238 msg->msg_namelen);
f3d33426 3239 }
1da177e4 3240
8dc41944 3241 if (pkt_sk(sk)->auxdata) {
ffbc6111
HX		 3242 struct tpacket_auxdata aux;
3243
3244 aux.tp_status = TP_STATUS_USER;
3245 if (skb->ip_summed == CHECKSUM_PARTIAL)
3246 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
682f048b
AD		 3247 else if (skb->pkt_type != PACKET_OUTGOING &&
3248 (skb->ip_summed == CHECKSUM_COMPLETE ||
3249 skb_csum_unnecessary(skb)))
3250 aux.tp_status |= TP_STATUS_CSUM_VALID;
3251
2472d761 3252 aux.tp_len = origlen;
ffbc6111
HX		 3253 aux.tp_snaplen = skb->len;
3254 aux.tp_mac = 0;
bbe735e4 3255 aux.tp_net = skb_network_offset(skb);
df8a39de
JP		 3256 if (skb_vlan_tag_present(skb)) {
3257 aux.tp_vlan_tci = skb_vlan_tag_get(skb);
a0cdfcf3
AW		 3258 aux.tp_vlan_tpid = ntohs(skb->vlan_proto);
3259 aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
a3bcc23e
BG		 3260 } else {
3261 aux.tp_vlan_tci = 0;
a0cdfcf3 3262 aux.tp_vlan_tpid = 0;
a3bcc23e 3263 }
ffbc6111 3264 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
8dc41944
HX		 3265 }
3266
1da177e4
LT		 3267 /*
3268 * Free or return the buffer as appropriate. Again this
3269 * hides all the races and re-entrancy issues from us.
3270 */
bfd5f4a3 3271 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
1da177e4
LT		 3272
3273out_free:
3274 skb_free_datagram(sk, skb);
3275out:
3276 return err;
3277}
3278
1da177e4
LT		 3279static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
3280 int *uaddr_len, int peer)
3281{
3282 struct net_device *dev;
3283 struct sock *sk = sock->sk;
3284
3285 if (peer)
3286 return -EOPNOTSUPP;
3287
3288 uaddr->sa_family = AF_PACKET;
2dc85bf3 3289 memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
654d1f8a
ED		 3290 rcu_read_lock();
3291 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
3292 if (dev)
2dc85bf3 3293 strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
654d1f8a 3294 rcu_read_unlock();
1da177e4
LT		 3295 *uaddr_len = sizeof(*uaddr);
3296
3297 return 0;
3298}
1da177e4
LT		 3299
3300static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
3301 int *uaddr_len, int peer)
3302{
3303 struct net_device *dev;
3304 struct sock *sk = sock->sk;
3305 struct packet_sock *po = pkt_sk(sk);
13cfa97b 3306 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
1da177e4
LT		 3307
3308 if (peer)
3309 return -EOPNOTSUPP;
3310
3311 sll->sll_family = AF_PACKET;
3312 sll->sll_ifindex = po->ifindex;
3313 sll->sll_protocol = po->num;
67286640 3314 sll->sll_pkttype = 0;
654d1f8a
ED		 3315 rcu_read_lock();
3316 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
1da177e4
LT		 3317 if (dev) {
3318 sll->sll_hatype = dev->type;
3319 sll->sll_halen = dev->addr_len;
3320 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
1da177e4
LT		 3321 } else {
3322 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
3323 sll->sll_halen = 0;
3324 }
654d1f8a 3325 rcu_read_unlock();
0fb375fb 3326 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
1da177e4
LT		 3327
3328 return 0;
3329}
3330
2aeb0b88
WC		 3331static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
3332 int what)
1da177e4
LT		 3333{
3334 switch (i->type) {
3335 case PACKET_MR_MULTICAST:
1162563f
JP		 3336 if (i->alen != dev->addr_len)
3337 return -EINVAL;
1da177e4 3338 if (what > 0)
22bedad3 3339 return dev_mc_add(dev, i->addr);
1da177e4 3340 else
22bedad3 3341 return dev_mc_del(dev, i->addr);
1da177e4
LT		 3342 break;
3343 case PACKET_MR_PROMISC:
2aeb0b88 3344 return dev_set_promiscuity(dev, what);
1da177e4 3345 case PACKET_MR_ALLMULTI:
2aeb0b88 3346 return dev_set_allmulti(dev, what);
d95ed927 3347 case PACKET_MR_UNICAST:
1162563f
JP		 3348 if (i->alen != dev->addr_len)
3349 return -EINVAL;
d95ed927 3350 if (what > 0)
a748ee24 3351 return dev_uc_add(dev, i->addr);
d95ed927 3352 else
a748ee24 3353 return dev_uc_del(dev, i->addr);
d95ed927 3354 break;
40d4e3df
ED		 3355 default:
3356 break;
1da177e4 3357 }
2aeb0b88 3358 return 0;
1da177e4
LT		 3359}
3360
82f17091
FR		 3361static void packet_dev_mclist_delete(struct net_device *dev,
3362 struct packet_mclist **mlp)
1da177e4 3363{
82f17091
FR		 3364 struct packet_mclist *ml;
3365
3366 while ((ml = *mlp) != NULL) {
3367 if (ml->ifindex == dev->ifindex) {
3368 packet_dev_mc(dev, ml, -1);
3369 *mlp = ml->next;
3370 kfree(ml);
3371 } else
3372 mlp = &ml->next;
1da177e4
LT		 3373 }
3374}
3375
0fb375fb 3376static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
1da177e4
LT		 3377{
3378 struct packet_sock *po = pkt_sk(sk);
3379 struct packet_mclist *ml, *i;
3380 struct net_device *dev;
3381 int err;
3382
3383 rtnl_lock();
3384
3385 err = -ENODEV;
3b1e0a65 3386 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
1da177e4
LT		 3387 if (!dev)
3388 goto done;
3389
3390 err = -EINVAL;
1162563f 3391 if (mreq->mr_alen > dev->addr_len)
1da177e4
LT		 3392 goto done;
3393
3394 err = -ENOBUFS;
8b3a7005 3395 i = kmalloc(sizeof(*i), GFP_KERNEL);
1da177e4
LT		 3396 if (i == NULL)
3397 goto done;
3398
3399 err = 0;
3400 for (ml = po->mclist; ml; ml = ml->next) {
3401 if (ml->ifindex == mreq->mr_ifindex &&
3402 ml->type == mreq->mr_type &&
3403 ml->alen == mreq->mr_alen &&
3404 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3405 ml->count++;
3406 /* Free the new element ... */
3407 kfree(i);
3408 goto done;
3409 }
3410 }
3411
3412 i->type = mreq->mr_type;
3413 i->ifindex = mreq->mr_ifindex;
3414 i->alen = mreq->mr_alen;
3415 memcpy(i->addr, mreq->mr_address, i->alen);
3416 i->count = 1;
3417 i->next = po->mclist;
3418 po->mclist = i;
2aeb0b88
WC		 3419 err = packet_dev_mc(dev, i, 1);
3420 if (err) {
3421 po->mclist = i->next;
3422 kfree(i);
3423 }
1da177e4
LT		 3424
3425done:
3426 rtnl_unlock();
3427 return err;
3428}
3429
0fb375fb 3430static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
1da177e4
LT		 3431{
3432 struct packet_mclist *ml, **mlp;
3433
3434 rtnl_lock();
3435
3436 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
3437 if (ml->ifindex == mreq->mr_ifindex &&
3438 ml->type == mreq->mr_type &&
3439 ml->alen == mreq->mr_alen &&
3440 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3441 if (--ml->count == 0) {
3442 struct net_device *dev;
3443 *mlp = ml->next;
ad959e76
ED		 3444 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3445 if (dev)
1da177e4 3446 packet_dev_mc(dev, ml, -1);
1da177e4
LT		 3447 kfree(ml);
3448 }
82f17091 3449 break;
1da177e4
LT		 3450 }
3451 }
3452 rtnl_unlock();
82f17091 3453 return 0;
1da177e4
LT		 3454}
3455
3456static void packet_flush_mclist(struct sock *sk)
3457{
3458 struct packet_sock *po = pkt_sk(sk);
3459 struct packet_mclist *ml;
3460
3461 if (!po->mclist)
3462 return;
3463
3464 rtnl_lock();
3465 while ((ml = po->mclist) != NULL) {
3466 struct net_device *dev;
3467
3468 po->mclist = ml->next;
ad959e76
ED		 3469 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3470 if (dev != NULL)
1da177e4 3471 packet_dev_mc(dev, ml, -1);
1da177e4
LT		 3472 kfree(ml);
3473 }
3474 rtnl_unlock();
3475}
1da177e4
LT		 3476
3477static int
b7058842 3478packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 3479{
3480 struct sock *sk = sock->sk;
8dc41944 3481 struct packet_sock *po = pkt_sk(sk);
1da177e4
LT		 3482 int ret;
3483
3484 if (level != SOL_PACKET)
3485 return -ENOPROTOOPT;
3486
69e3c75f 3487 switch (optname) {
1ce4f28b 3488 case PACKET_ADD_MEMBERSHIP:
1da177e4
LT		 3489 case PACKET_DROP_MEMBERSHIP:
3490 {
0fb375fb
EB		 3491 struct packet_mreq_max mreq;
3492 int len = optlen;
3493 memset(&mreq, 0, sizeof(mreq));
3494 if (len < sizeof(struct packet_mreq))
1da177e4 3495 return -EINVAL;
0fb375fb
EB		 3496 if (len > sizeof(mreq))
3497 len = sizeof(mreq);
40d4e3df 3498 if (copy_from_user(&mreq, optval, len))
1da177e4 3499 return -EFAULT;
0fb375fb
EB		 3500 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
3501 return -EINVAL;
1da177e4
LT		 3502 if (optname == PACKET_ADD_MEMBERSHIP)
3503 ret = packet_mc_add(sk, &mreq);
3504 else
3505 ret = packet_mc_drop(sk, &mreq);
3506 return ret;
3507 }
a2efcfa0 3508
1da177e4 3509 case PACKET_RX_RING:
69e3c75f 3510 case PACKET_TX_RING:
1da177e4 3511 {
f6fb8f10 3512 union tpacket_req_u req_u;
3513 int len;
1da177e4 3514
f6fb8f10 3515 switch (po->tp_version) {
3516 case TPACKET_V1:
3517 case TPACKET_V2:
3518 len = sizeof(req_u.req);
3519 break;
3520 case TPACKET_V3:
3521 default:
3522 len = sizeof(req_u.req3);
3523 break;
3524 }
3525 if (optlen < len)
1da177e4 3526 return -EINVAL;
bfd5f4a3
SS		 3527 if (pkt_sk(sk)->has_vnet_hdr)
3528 return -EINVAL;
f6fb8f10 3529 if (copy_from_user(&req_u.req, optval, len))
1da177e4 3530 return -EFAULT;
f6fb8f10 3531 return packet_set_ring(sk, &req_u, 0,
3532 optname == PACKET_TX_RING);
1da177e4
LT		 3533 }
3534 case PACKET_COPY_THRESH:
3535 {
3536 int val;
3537
40d4e3df 3538 if (optlen != sizeof(val))
1da177e4 3539 return -EINVAL;
40d4e3df 3540 if (copy_from_user(&val, optval, sizeof(val)))
1da177e4
LT		 3541 return -EFAULT;
3542
3543 pkt_sk(sk)->copy_thresh = val;
3544 return 0;
3545 }
bbd6ef87
PM		 3546 case PACKET_VERSION:
3547 {
3548 int val;
3549
3550 if (optlen != sizeof(val))
3551 return -EINVAL;
69e3c75f 3552 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
bbd6ef87
PM		 3553 return -EBUSY;
3554 if (copy_from_user(&val, optval, sizeof(val)))
3555 return -EFAULT;
3556 switch (val) {
3557 case TPACKET_V1:
3558 case TPACKET_V2:
f6fb8f10 3559 case TPACKET_V3:
bbd6ef87
PM		 3560 po->tp_version = val;
3561 return 0;
3562 default:
3563 return -EINVAL;
3564 }
3565 }
8913336a
PM		 3566 case PACKET_RESERVE:
3567 {
3568 unsigned int val;
3569
3570 if (optlen != sizeof(val))
3571 return -EINVAL;
69e3c75f 3572 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
8913336a
PM		 3573 return -EBUSY;
3574 if (copy_from_user(&val, optval, sizeof(val)))
3575 return -EFAULT;
3576 po->tp_reserve = val;
3577 return 0;
3578 }
69e3c75f
JB		 3579 case PACKET_LOSS:
3580 {
3581 unsigned int val;
3582
3583 if (optlen != sizeof(val))
3584 return -EINVAL;
3585 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3586 return -EBUSY;
3587 if (copy_from_user(&val, optval, sizeof(val)))
3588 return -EFAULT;
3589 po->tp_loss = !!val;
3590 return 0;
3591 }
8dc41944
HX		 3592 case PACKET_AUXDATA:
3593 {
3594 int val;
3595
3596 if (optlen < sizeof(val))
3597 return -EINVAL;
3598 if (copy_from_user(&val, optval, sizeof(val)))
3599 return -EFAULT;
3600
3601 po->auxdata = !!val;
3602 return 0;
3603 }
80feaacb
PWJ		 3604 case PACKET_ORIGDEV:
3605 {
3606 int val;
3607
3608 if (optlen < sizeof(val))
3609 return -EINVAL;
3610 if (copy_from_user(&val, optval, sizeof(val)))
3611 return -EFAULT;
3612
3613 po->origdev = !!val;
3614 return 0;
3615 }
bfd5f4a3
SS		 3616 case PACKET_VNET_HDR:
3617 {
3618 int val;
3619
3620 if (sock->type != SOCK_RAW)
3621 return -EINVAL;
3622 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3623 return -EBUSY;
3624 if (optlen < sizeof(val))
3625 return -EINVAL;
3626 if (copy_from_user(&val, optval, sizeof(val)))
3627 return -EFAULT;
3628
3629 po->has_vnet_hdr = !!val;
3630 return 0;
3631 }
614f60fa
SM		 3632 case PACKET_TIMESTAMP:
3633 {
3634 int val;
3635
3636 if (optlen != sizeof(val))
3637 return -EINVAL;
3638 if (copy_from_user(&val, optval, sizeof(val)))
3639 return -EFAULT;
3640
3641 po->tp_tstamp = val;
3642 return 0;
3643 }
dc99f600
DM		 3644 case PACKET_FANOUT:
3645 {
3646 int val;
3647
3648 if (optlen != sizeof(val))
3649 return -EINVAL;
3650 if (copy_from_user(&val, optval, sizeof(val)))
3651 return -EFAULT;
3652
3653 return fanout_add(sk, val & 0xffff, val >> 16);
3654 }
47dceb8e
WB		 3655 case PACKET_FANOUT_DATA:
3656 {
3657 if (!po->fanout)
3658 return -EINVAL;
3659
3660 return fanout_set_data(po, optval, optlen);
3661 }
5920cd3a
PC		 3662 case PACKET_TX_HAS_OFF:
3663 {
3664 unsigned int val;
3665
3666 if (optlen != sizeof(val))
3667 return -EINVAL;
3668 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3669 return -EBUSY;
3670 if (copy_from_user(&val, optval, sizeof(val)))
3671 return -EFAULT;
3672 po->tp_tx_has_off = !!val;
3673 return 0;
3674 }
d346a3fa
DB		 3675 case PACKET_QDISC_BYPASS:
3676 {
3677 int val;
3678
3679 if (optlen != sizeof(val))
3680 return -EINVAL;
3681 if (copy_from_user(&val, optval, sizeof(val)))
3682 return -EFAULT;
3683
3684 po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
3685 return 0;
3686 }
1da177e4
LT		 3687 default:
3688 return -ENOPROTOOPT;
3689 }
3690}
3691
3692static int packet_getsockopt(struct socket *sock, int level, int optname,
3693 char __user *optval, int __user *optlen)
3694{
3695 int len;
c06fff6e 3696 int val, lv = sizeof(val);
1da177e4
LT		 3697 struct sock *sk = sock->sk;
3698 struct packet_sock *po = pkt_sk(sk);
c06fff6e 3699 void *data = &val;
ee80fbf3 3700 union tpacket_stats_u st;
a9b63918 3701 struct tpacket_rollover_stats rstats;
1da177e4
LT		 3702
3703 if (level != SOL_PACKET)
3704 return -ENOPROTOOPT;
3705
8ae55f04
KK		 3706 if (get_user(len, optlen))
3707 return -EFAULT;
1da177e4
LT		 3708
3709 if (len < 0)
3710 return -EINVAL;
1ce4f28b 3711
69e3c75f 3712 switch (optname) {
1da177e4 3713 case PACKET_STATISTICS:
1da177e4 3714 spin_lock_bh(&sk->sk_receive_queue.lock);
ee80fbf3
DB		 3715 memcpy(&st, &po->stats, sizeof(st));
3716 memset(&po->stats, 0, sizeof(po->stats));
3717 spin_unlock_bh(&sk->sk_receive_queue.lock);
3718
f6fb8f10 3719 if (po->tp_version == TPACKET_V3) {
c06fff6e 3720 lv = sizeof(struct tpacket_stats_v3);
8bcdeaff 3721 st.stats3.tp_packets += st.stats3.tp_drops;
ee80fbf3 3722 data = &st.stats3;
f6fb8f10 3723 } else {
c06fff6e 3724 lv = sizeof(struct tpacket_stats);
8bcdeaff 3725 st.stats1.tp_packets += st.stats1.tp_drops;
ee80fbf3 3726 data = &st.stats1;
f6fb8f10 3727 }
ee80fbf3 3728
8dc41944
HX		 3729 break;
3730 case PACKET_AUXDATA:
8dc41944 3731 val = po->auxdata;
80feaacb
PWJ		 3732 break;
3733 case PACKET_ORIGDEV:
80feaacb 3734 val = po->origdev;
bfd5f4a3
SS		 3735 break;
3736 case PACKET_VNET_HDR:
bfd5f4a3 3737 val = po->has_vnet_hdr;
1da177e4 3738 break;
bbd6ef87 3739 case PACKET_VERSION:
bbd6ef87 3740 val = po->tp_version;
bbd6ef87
PM		 3741 break;
3742 case PACKET_HDRLEN:
3743 if (len > sizeof(int))
3744 len = sizeof(int);
3745 if (copy_from_user(&val, optval, len))
3746 return -EFAULT;
3747 switch (val) {
3748 case TPACKET_V1:
3749 val = sizeof(struct tpacket_hdr);
3750 break;
3751 case TPACKET_V2:
3752 val = sizeof(struct tpacket2_hdr);
3753 break;
f6fb8f10 3754 case TPACKET_V3:
3755 val = sizeof(struct tpacket3_hdr);
3756 break;
bbd6ef87
PM		 3757 default:
3758 return -EINVAL;
3759 }
bbd6ef87 3760 break;
8913336a 3761 case PACKET_RESERVE:
8913336a 3762 val = po->tp_reserve;
8913336a 3763 break;
69e3c75f 3764 case PACKET_LOSS:
69e3c75f 3765 val = po->tp_loss;
69e3c75f 3766 break;
614f60fa 3767 case PACKET_TIMESTAMP:
614f60fa 3768 val = po->tp_tstamp;
614f60fa 3769 break;
dc99f600 3770 case PACKET_FANOUT:
dc99f600
DM		 3771 val = (po->fanout ?
3772 ((u32)po->fanout->id |
77f65ebd
WB		 3773 ((u32)po->fanout->type << 16) |
3774 ((u32)po->fanout->flags << 24)) :
dc99f600 3775 0);
dc99f600 3776 break;
a9b63918
WB		 3777 case PACKET_ROLLOVER_STATS:
3778 if (!po->rollover)
3779 return -EINVAL;
3780 rstats.tp_all = atomic_long_read(&po->rollover->num);
3781 rstats.tp_huge = atomic_long_read(&po->rollover->num_huge);
3782 rstats.tp_failed = atomic_long_read(&po->rollover->num_failed);
3783 data = &rstats;
3784 lv = sizeof(rstats);
3785 break;
5920cd3a
PC		 3786 case PACKET_TX_HAS_OFF:
3787 val = po->tp_tx_has_off;
3788 break;
d346a3fa
DB		 3789 case PACKET_QDISC_BYPASS:
3790 val = packet_use_direct_xmit(po);
3791 break;
1da177e4
LT		 3792 default:
3793 return -ENOPROTOOPT;
3794 }
3795
c06fff6e
ED		 3796 if (len > lv)
3797 len = lv;
8ae55f04
KK		 3798 if (put_user(len, optlen))
3799 return -EFAULT;
8dc41944
HX		 3800 if (copy_to_user(optval, data, len))
3801 return -EFAULT;
8ae55f04 3802 return 0;
1da177e4
LT		 3803}
3804
3805
351638e7
JP		 3806static int packet_notifier(struct notifier_block *this,
3807 unsigned long msg, void *ptr)
1da177e4
LT		 3808{
3809 struct sock *sk;
351638e7 3810 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 3811 struct net *net = dev_net(dev);
1da177e4 3812
808f5114 3813 rcu_read_lock();
b67bfe0d 3814 sk_for_each_rcu(sk, &net->packet.sklist) {
1da177e4
LT		 3815 struct packet_sock *po = pkt_sk(sk);
3816
3817 switch (msg) {
3818 case NETDEV_UNREGISTER:
1da177e4 3819 if (po->mclist)
82f17091 3820 packet_dev_mclist_delete(dev, &po->mclist);
a2efcfa0
DM		 3821 /* fallthrough */
3822
1da177e4
LT		 3823 case NETDEV_DOWN:
3824 if (dev->ifindex == po->ifindex) {
3825 spin_lock(&po->bind_lock);
3826 if (po->running) {
ce06b03e 3827 __unregister_prot_hook(sk, false);
1da177e4
LT		 3828 sk->sk_err = ENETDOWN;
3829 if (!sock_flag(sk, SOCK_DEAD))
3830 sk->sk_error_report(sk);
3831 }
3832 if (msg == NETDEV_UNREGISTER) {
66e56cd4 3833 packet_cached_dev_reset(po);
1da177e4 3834 po->ifindex = -1;
160ff18a
BG		 3835 if (po->prot_hook.dev)
3836 dev_put(po->prot_hook.dev);
1da177e4
LT		 3837 po->prot_hook.dev = NULL;
3838 }
3839 spin_unlock(&po->bind_lock);
3840 }
3841 break;
3842 case NETDEV_UP:
808f5114 3843 if (dev->ifindex == po->ifindex) {
3844 spin_lock(&po->bind_lock);
ce06b03e
DM		 3845 if (po->num)
3846 register_prot_hook(sk);
808f5114 3847 spin_unlock(&po->bind_lock);
1da177e4 3848 }
1da177e4
LT		 3849 break;
3850 }
3851 }
808f5114 3852 rcu_read_unlock();
1da177e4
LT		 3853 return NOTIFY_DONE;
3854}
3855
3856
3857static int packet_ioctl(struct socket *sock, unsigned int cmd,
3858 unsigned long arg)
3859{
3860 struct sock *sk = sock->sk;
3861
69e3c75f 3862 switch (cmd) {
40d4e3df
ED		 3863 case SIOCOUTQ:
3864 {
3865 int amount = sk_wmem_alloc_get(sk);
31e6d363 3866
40d4e3df
ED		 3867 return put_user(amount, (int __user *)arg);
3868 }
3869 case SIOCINQ:
3870 {
3871 struct sk_buff *skb;
3872 int amount = 0;
3873
3874 spin_lock_bh(&sk->sk_receive_queue.lock);
3875 skb = skb_peek(&sk->sk_receive_queue);
3876 if (skb)
3877 amount = skb->len;
3878 spin_unlock_bh(&sk->sk_receive_queue.lock);
3879 return put_user(amount, (int __user *)arg);
3880 }
3881 case SIOCGSTAMP:
3882 return sock_get_timestamp(sk, (struct timeval __user *)arg);
3883 case SIOCGSTAMPNS:
3884 return sock_get_timestampns(sk, (struct timespec __user *)arg);
1ce4f28b 3885
1da177e4 3886#ifdef CONFIG_INET
40d4e3df
ED		 3887 case SIOCADDRT:
3888 case SIOCDELRT:
3889 case SIOCDARP:
3890 case SIOCGARP:
3891 case SIOCSARP:
3892 case SIOCGIFADDR:
3893 case SIOCSIFADDR:
3894 case SIOCGIFBRDADDR:
3895 case SIOCSIFBRDADDR:
3896 case SIOCGIFNETMASK:
3897 case SIOCSIFNETMASK:
3898 case SIOCGIFDSTADDR:
3899 case SIOCSIFDSTADDR:
3900 case SIOCSIFFLAGS:
40d4e3df 3901 return inet_dgram_ops.ioctl(sock, cmd, arg);
1da177e4
LT		 3902#endif
3903
40d4e3df
ED		 3904 default:
3905 return -ENOIOCTLCMD;
1da177e4
LT		 3906 }
3907 return 0;
3908}
3909
40d4e3df 3910static unsigned int packet_poll(struct file *file, struct socket *sock,
1da177e4
LT		 3911 poll_table *wait)
3912{
3913 struct sock *sk = sock->sk;
3914 struct packet_sock *po = pkt_sk(sk);
3915 unsigned int mask = datagram_poll(file, sock, wait);
3916
3917 spin_lock_bh(&sk->sk_receive_queue.lock);
69e3c75f 3918 if (po->rx_ring.pg_vec) {
f6fb8f10 3919 if (!packet_previous_rx_frame(po, &po->rx_ring,
3920 TP_STATUS_KERNEL))
1da177e4
LT		 3921 mask |= POLLIN | POLLRDNORM;
3922 }
2ccdbaa6 3923 if (po->pressure && __packet_rcv_has_room(po, NULL) == ROOM_NORMAL)
54d7c01d 3924 po->pressure = 0;
1da177e4 3925 spin_unlock_bh(&sk->sk_receive_queue.lock);
69e3c75f
JB		 3926 spin_lock_bh(&sk->sk_write_queue.lock);
3927 if (po->tx_ring.pg_vec) {
3928 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
3929 mask |= POLLOUT | POLLWRNORM;
3930 }
3931 spin_unlock_bh(&sk->sk_write_queue.lock);
1da177e4
LT		 3932 return mask;
3933}
3934
3935
3936/* Dirty? Well, I still did not learn better way to account
3937 * for user mmaps.
3938 */
3939
3940static void packet_mm_open(struct vm_area_struct *vma)
3941{
3942 struct file *file = vma->vm_file;
40d4e3df 3943 struct socket *sock = file->private_data;
1da177e4 3944 struct sock *sk = sock->sk;
1ce4f28b 3945
1da177e4
LT		 3946 if (sk)
3947 atomic_inc(&pkt_sk(sk)->mapped);
3948}
3949
3950static void packet_mm_close(struct vm_area_struct *vma)
3951{
3952 struct file *file = vma->vm_file;
40d4e3df 3953 struct socket *sock = file->private_data;
1da177e4 3954 struct sock *sk = sock->sk;
1ce4f28b 3955
1da177e4
LT		 3956 if (sk)
3957 atomic_dec(&pkt_sk(sk)->mapped);
3958}
3959
f0f37e2f 3960static const struct vm_operations_struct packet_mmap_ops = {
40d4e3df
ED		 3961 .open = packet_mm_open,
3962 .close = packet_mm_close,
1da177e4
LT		 3963};
3964
0e3125c7
NH		 3965static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
3966 unsigned int len)
1da177e4
LT		 3967{
3968 int i;
3969
4ebf0ae2 3970 for (i = 0; i < len; i++) {
0e3125c7 3971 if (likely(pg_vec[i].buffer)) {
c56b4d90 3972 if (is_vmalloc_addr(pg_vec[i].buffer))
0e3125c7
NH		 3973 vfree(pg_vec[i].buffer);
3974 else
3975 free_pages((unsigned long)pg_vec[i].buffer,
3976 order);
3977 pg_vec[i].buffer = NULL;
3978 }
1da177e4
LT		 3979 }
3980 kfree(pg_vec);
3981}
3982
eea49cc9 3983static char *alloc_one_pg_vec_page(unsigned long order)
4ebf0ae2 3984{
f0d4eb29 3985 char *buffer;
0e3125c7
NH		 3986 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
3987 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
3988
3989 buffer = (char *) __get_free_pages(gfp_flags, order);
0e3125c7
NH		 3990 if (buffer)
3991 return buffer;
3992
f0d4eb29 3993 /* __get_free_pages failed, fall back to vmalloc */
bbce5a59 3994 buffer = vzalloc((1 << order) * PAGE_SIZE);
0e3125c7
NH		 3995 if (buffer)
3996 return buffer;
3997
f0d4eb29 3998 /* vmalloc failed, lets dig into swap here */
0e3125c7 3999 gfp_flags &= ~__GFP_NORETRY;
f0d4eb29 4000 buffer = (char *) __get_free_pages(gfp_flags, order);
0e3125c7
NH		 4001 if (buffer)
4002 return buffer;
4003
f0d4eb29 4004 /* complete and utter failure */
0e3125c7 4005 return NULL;
4ebf0ae2
DM		 4006}
4007
0e3125c7 4008static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
4ebf0ae2
DM		 4009{
4010 unsigned int block_nr = req->tp_block_nr;
0e3125c7 4011 struct pgv *pg_vec;
4ebf0ae2
DM		 4012 int i;
4013
0e3125c7 4014 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
4ebf0ae2
DM		 4015 if (unlikely(!pg_vec))
4016 goto out;
4017
4018 for (i = 0; i < block_nr; i++) {
c56b4d90 4019 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
0e3125c7 4020 if (unlikely(!pg_vec[i].buffer))
4ebf0ae2
DM		 4021 goto out_free_pgvec;
4022 }
4023
4024out:
4025 return pg_vec;
4026
4027out_free_pgvec:
4028 free_pg_vec(pg_vec, order, block_nr);
4029 pg_vec = NULL;
4030 goto out;
4031}
1da177e4 4032
f6fb8f10 4033static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
69e3c75f 4034 int closing, int tx_ring)
1da177e4 4035{
0e3125c7 4036 struct pgv *pg_vec = NULL;
1da177e4 4037 struct packet_sock *po = pkt_sk(sk);
0e11c91e 4038 int was_running, order = 0;
69e3c75f
JB		 4039 struct packet_ring_buffer *rb;
4040 struct sk_buff_head *rb_queue;
0e11c91e 4041 __be16 num;
f6fb8f10 4042 int err = -EINVAL;
4043 /* Added to avoid minimal code churn */
4044 struct tpacket_req *req = &req_u->req;
4045
4046 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
4047 if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) {
4048 WARN(1, "Tx-ring is not supported.\n");
4049 goto out;
4050 }
1ce4f28b 4051
69e3c75f
JB		 4052 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
4053 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
1da177e4 4054
69e3c75f
JB		 4055 err = -EBUSY;
4056 if (!closing) {
4057 if (atomic_read(&po->mapped))
4058 goto out;
b0138408 4059 if (packet_read_pending(rb))
69e3c75f
JB		 4060 goto out;
4061 }
1da177e4 4062
69e3c75f
JB		 4063 if (req->tp_block_nr) {
4064 /* Sanity tests and some calculations */
4065 err = -EBUSY;
4066 if (unlikely(rb->pg_vec))
4067 goto out;
1da177e4 4068
bbd6ef87
PM		 4069 switch (po->tp_version) {
4070 case TPACKET_V1:
4071 po->tp_hdrlen = TPACKET_HDRLEN;
4072 break;
4073 case TPACKET_V2:
4074 po->tp_hdrlen = TPACKET2_HDRLEN;
4075 break;
f6fb8f10 4076 case TPACKET_V3:
4077 po->tp_hdrlen = TPACKET3_HDRLEN;
4078 break;
bbd6ef87
PM		 4079 }
4080
69e3c75f 4081 err = -EINVAL;
4ebf0ae2 4082 if (unlikely((int)req->tp_block_size <= 0))
69e3c75f 4083 goto out;
4ebf0ae2 4084 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
69e3c75f 4085 goto out;
dc808110
ED		 4086 if (po->tp_version >= TPACKET_V3 &&
4087 (int)(req->tp_block_size -
4088 BLK_PLUS_PRIV(req_u->req3.tp_sizeof_priv)) <= 0)
4089 goto out;
8913336a 4090 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
69e3c75f
JB		 4091 po->tp_reserve))
4092 goto out;
4ebf0ae2 4093 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
69e3c75f 4094 goto out;
1da177e4 4095
69e3c75f
JB		 4096 rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
4097 if (unlikely(rb->frames_per_block <= 0))
4098 goto out;
4099 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
4100 req->tp_frame_nr))
4101 goto out;
1da177e4
LT		 4102
4103 err = -ENOMEM;
4ebf0ae2
DM		 4104 order = get_order(req->tp_block_size);
4105 pg_vec = alloc_pg_vec(req, order);
4106 if (unlikely(!pg_vec))
1da177e4 4107 goto out;
f6fb8f10 4108 switch (po->tp_version) {
4109 case TPACKET_V3:
4110 /* Transmit path is not supported. We checked
4111 * it above but just being paranoid
4112 */
4113 if (!tx_ring)
e8e85cc5 4114 init_prb_bdqc(po, rb, pg_vec, req_u);
d7cf0c34 4115 break;
f6fb8f10 4116 default:
4117 break;
4118 }
69e3c75f
JB		 4119 }
4120 /* Done */
4121 else {
4122 err = -EINVAL;
4ebf0ae2 4123 if (unlikely(req->tp_frame_nr))
69e3c75f 4124 goto out;
1da177e4
LT		 4125 }
4126
4127 lock_sock(sk);
4128
4129 /* Detach socket from network */
4130 spin_lock(&po->bind_lock);
4131 was_running = po->running;
4132 num = po->num;
4133 if (was_running) {
1da177e4 4134 po->num = 0;
ce06b03e 4135 __unregister_prot_hook(sk, false);
1da177e4
LT		 4136 }
4137 spin_unlock(&po->bind_lock);
1ce4f28b 4138
1da177e4
LT		 4139 synchronize_net();
4140
4141 err = -EBUSY;
905db440 4142 mutex_lock(&po->pg_vec_lock);
1da177e4
LT		 4143 if (closing || atomic_read(&po->mapped) == 0) {
4144 err = 0;
69e3c75f 4145 spin_lock_bh(&rb_queue->lock);
c053fd96 4146 swap(rb->pg_vec, pg_vec);
69e3c75f
JB		 4147 rb->frame_max = (req->tp_frame_nr - 1);
4148 rb->head = 0;
4149 rb->frame_size = req->tp_frame_size;
4150 spin_unlock_bh(&rb_queue->lock);
4151
c053fd96
CG		 4152 swap(rb->pg_vec_order, order);
4153 swap(rb->pg_vec_len, req->tp_block_nr);
69e3c75f
JB		 4154
4155 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
4156 po->prot_hook.func = (po->rx_ring.pg_vec) ?
4157 tpacket_rcv : packet_rcv;
4158 skb_queue_purge(rb_queue);
1da177e4 4159 if (atomic_read(&po->mapped))
40d4e3df
ED		 4160 pr_err("packet_mmap: vma is busy: %d\n",
4161 atomic_read(&po->mapped));
1da177e4 4162 }
905db440 4163 mutex_unlock(&po->pg_vec_lock);
1da177e4
LT		 4164
4165 spin_lock(&po->bind_lock);
ce06b03e 4166 if (was_running) {
1da177e4 4167 po->num = num;
ce06b03e 4168 register_prot_hook(sk);
1da177e4
LT		 4169 }
4170 spin_unlock(&po->bind_lock);
f6fb8f10 4171 if (closing && (po->tp_version > TPACKET_V2)) {
4172 /* Because we don't support block-based V3 on tx-ring */
4173 if (!tx_ring)
73d0fcf2 4174 prb_shutdown_retire_blk_timer(po, rb_queue);
f6fb8f10 4175 }
1da177e4
LT		 4176 release_sock(sk);
4177
1da177e4
LT		 4178 if (pg_vec)
4179 free_pg_vec(pg_vec, order, req->tp_block_nr);
4180out:
4181 return err;
4182}
4183
69e3c75f
JB		 4184static int packet_mmap(struct file *file, struct socket *sock,
4185 struct vm_area_struct *vma)
1da177e4
LT		 4186{
4187 struct sock *sk = sock->sk;
4188 struct packet_sock *po = pkt_sk(sk);
69e3c75f
JB		 4189 unsigned long size, expected_size;
4190 struct packet_ring_buffer *rb;
1da177e4
LT		 4191 unsigned long start;
4192 int err = -EINVAL;
4193 int i;
4194
4195 if (vma->vm_pgoff)
4196 return -EINVAL;
4197
905db440 4198 mutex_lock(&po->pg_vec_lock);
69e3c75f
JB		 4199
4200 expected_size = 0;
4201 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4202 if (rb->pg_vec) {
4203 expected_size += rb->pg_vec_len
4204 * rb->pg_vec_pages
4205 * PAGE_SIZE;
4206 }
4207 }
4208
4209 if (expected_size == 0)
1da177e4 4210 goto out;
69e3c75f
JB		 4211
4212 size = vma->vm_end - vma->vm_start;
4213 if (size != expected_size)
1da177e4
LT		 4214 goto out;
4215
1da177e4 4216 start = vma->vm_start;
69e3c75f
JB		 4217 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4218 if (rb->pg_vec == NULL)
4219 continue;
4220
4221 for (i = 0; i < rb->pg_vec_len; i++) {
0e3125c7
NH		 4222 struct page *page;
4223 void *kaddr = rb->pg_vec[i].buffer;
69e3c75f
JB		 4224 int pg_num;
4225
c56b4d90
CG		 4226 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
4227 page = pgv_to_page(kaddr);
69e3c75f
JB		 4228 err = vm_insert_page(vma, start, page);
4229 if (unlikely(err))
4230 goto out;
4231 start += PAGE_SIZE;
0e3125c7 4232 kaddr += PAGE_SIZE;
69e3c75f 4233 }
4ebf0ae2 4234 }
1da177e4 4235 }
69e3c75f 4236
4ebf0ae2 4237 atomic_inc(&po->mapped);
1da177e4
LT		 4238 vma->vm_ops = &packet_mmap_ops;
4239 err = 0;
4240
4241out:
905db440 4242 mutex_unlock(&po->pg_vec_lock);
1da177e4
LT		 4243 return err;
4244}
1da177e4 4245
90ddc4f0 4246static const struct proto_ops packet_ops_spkt = {
1da177e4
LT		 4247 .family = PF_PACKET,
4248 .owner = THIS_MODULE,
4249 .release = packet_release,
4250 .bind = packet_bind_spkt,
4251 .connect = sock_no_connect,
4252 .socketpair = sock_no_socketpair,
4253 .accept = sock_no_accept,
4254 .getname = packet_getname_spkt,
4255 .poll = datagram_poll,
4256 .ioctl = packet_ioctl,
4257 .listen = sock_no_listen,
4258 .shutdown = sock_no_shutdown,
4259 .setsockopt = sock_no_setsockopt,
4260 .getsockopt = sock_no_getsockopt,
4261 .sendmsg = packet_sendmsg_spkt,
4262 .recvmsg = packet_recvmsg,
4263 .mmap = sock_no_mmap,
4264 .sendpage = sock_no_sendpage,
4265};
1da177e4 4266
90ddc4f0 4267static const struct proto_ops packet_ops = {
1da177e4
LT		 4268 .family = PF_PACKET,
4269 .owner = THIS_MODULE,
4270 .release = packet_release,
4271 .bind = packet_bind,
4272 .connect = sock_no_connect,
4273 .socketpair = sock_no_socketpair,
4274 .accept = sock_no_accept,
1ce4f28b 4275 .getname = packet_getname,
1da177e4
LT		 4276 .poll = packet_poll,
4277 .ioctl = packet_ioctl,
4278 .listen = sock_no_listen,
4279 .shutdown = sock_no_shutdown,
4280 .setsockopt = packet_setsockopt,
4281 .getsockopt = packet_getsockopt,
4282 .sendmsg = packet_sendmsg,
4283 .recvmsg = packet_recvmsg,
4284 .mmap = packet_mmap,
4285 .sendpage = sock_no_sendpage,
4286};
4287
ec1b4cf7 4288static const struct net_proto_family packet_family_ops = {
1da177e4
LT		 4289 .family = PF_PACKET,
4290 .create = packet_create,
4291 .owner = THIS_MODULE,
4292};
4293
4294static struct notifier_block packet_netdev_notifier = {
40d4e3df 4295 .notifier_call = packet_notifier,
1da177e4
LT		 4296};
4297
4298#ifdef CONFIG_PROC_FS
1da177e4
LT		 4299
4300static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
808f5114 4301 __acquires(RCU)
1da177e4 4302{
e372c414 4303 struct net *net = seq_file_net(seq);
808f5114 4304
4305 rcu_read_lock();
4306 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
1da177e4
LT		 4307}
4308
4309static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4310{
1bf40954 4311 struct net *net = seq_file_net(seq);
808f5114 4312 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
1da177e4
LT		 4313}
4314
4315static void packet_seq_stop(struct seq_file *seq, void *v)
808f5114 4316 __releases(RCU)
1da177e4 4317{
808f5114 4318 rcu_read_unlock();
1da177e4
LT		 4319}
4320
1ce4f28b 4321static int packet_seq_show(struct seq_file *seq, void *v)
1da177e4
LT		 4322{
4323 if (v == SEQ_START_TOKEN)
4324 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4325 else {
b7ceabd9 4326 struct sock *s = sk_entry(v);
1da177e4
LT		 4327 const struct packet_sock *po = pkt_sk(s);
4328
4329 seq_printf(seq,
71338aa7 4330 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
1da177e4
LT		 4331 s,
4332 atomic_read(&s->sk_refcnt),
4333 s->sk_type,
4334 ntohs(po->num),
4335 po->ifindex,
4336 po->running,
4337 atomic_read(&s->sk_rmem_alloc),
a7cb5a49 4338 from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)),
40d4e3df 4339 sock_i_ino(s));
1da177e4
LT		 4340 }
4341
4342 return 0;
4343}
4344
56b3d975 4345static const struct seq_operations packet_seq_ops = {
1da177e4
LT		 4346 .start = packet_seq_start,
4347 .next = packet_seq_next,
4348 .stop = packet_seq_stop,
4349 .show = packet_seq_show,
4350};
4351
4352static int packet_seq_open(struct inode *inode, struct file *file)
4353{
e372c414
DL		 4354 return seq_open_net(inode, file, &packet_seq_ops,
4355 sizeof(struct seq_net_private));
1da177e4
LT		 4356}
4357
da7071d7 4358static const struct file_operations packet_seq_fops = {
1da177e4
LT		 4359 .owner = THIS_MODULE,
4360 .open = packet_seq_open,
4361 .read = seq_read,
4362 .llseek = seq_lseek,
e372c414 4363 .release = seq_release_net,
1da177e4
LT		 4364};
4365
4366#endif
4367
2c8c1e72 4368static int __net_init packet_net_init(struct net *net)
d12d01d6 4369{
0fa7fa98 4370 mutex_init(&net->packet.sklist_lock);
2aaef4e4 4371 INIT_HLIST_HEAD(&net->packet.sklist);
d12d01d6 4372
d4beaa66 4373 if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops))
d12d01d6
DL		 4374 return -ENOMEM;
4375
4376 return 0;
4377}
4378
2c8c1e72 4379static void __net_exit packet_net_exit(struct net *net)
d12d01d6 4380{
ece31ffd 4381 remove_proc_entry("packet", net->proc_net);
d12d01d6
DL		 4382}
4383
4384static struct pernet_operations packet_net_ops = {
4385 .init = packet_net_init,
4386 .exit = packet_net_exit,
4387};
4388
4389
1da177e4
LT		 4390static void __exit packet_exit(void)
4391{
1da177e4 4392 unregister_netdevice_notifier(&packet_netdev_notifier);
d12d01d6 4393 unregister_pernet_subsys(&packet_net_ops);
1da177e4
LT		 4394 sock_unregister(PF_PACKET);
4395 proto_unregister(&packet_proto);
4396}
4397
4398static int __init packet_init(void)
4399{
4400 int rc = proto_register(&packet_proto, 0);
4401
4402 if (rc != 0)
4403 goto out;
4404
4405 sock_register(&packet_family_ops);
d12d01d6 4406 register_pernet_subsys(&packet_net_ops);
1da177e4 4407 register_netdevice_notifier(&packet_netdev_notifier);
1da177e4
LT		 4408out:
4409 return rc;
4410}
4411
4412module_init(packet_init);
4413module_exit(packet_exit);
4414MODULE_LICENSE("GPL");
4415MODULE_ALIAS_NETPROTO(PF_PACKET);
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