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rps: fix insufficient bounds checking in store_rps_dev_flow_table_cnt()
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / packet / af_packet.c
CommitLineData
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>
76#include <asm/system.h>
77#include <asm/uaccess.h>
78#include <asm/ioctls.h>
79#include <asm/page.h>
a1f8e7f7 80#include <asm/cacheflush.h>
1da177e4
LT		 81#include <asm/io.h>
82#include <linux/proc_fs.h>
83#include <linux/seq_file.h>
84#include <linux/poll.h>
85#include <linux/module.h>
86#include <linux/init.h>
905db440 87#include <linux/mutex.h>
05423b24 88#include <linux/if_vlan.h>
bfd5f4a3 89#include <linux/virtio_net.h>
ed85b565 90#include <linux/errqueue.h>
614f60fa 91#include <linux/net_tstamp.h>
1da177e4
LT		 92
93#ifdef CONFIG_INET
94#include <net/inet_common.h>
95#endif
96
1da177e4
LT		 97/*
98 Assumptions:
99 - if device has no dev->hard_header routine, it adds and removes ll header
100 inside itself. In this case ll header is invisible outside of device,
101 but higher levels still should reserve dev->hard_header_len.
102 Some devices are enough clever to reallocate skb, when header
103 will not fit to reserved space (tunnel), another ones are silly
104 (PPP).
105 - packet socket receives packets with pulled ll header,
106 so that SOCK_RAW should push it back.
107
108On receive:
109-----------
110
111Incoming, dev->hard_header!=NULL
b0e380b1
ACM		 112 mac_header -> ll header
113 data -> data
1da177e4
LT		 114
115Outgoing, dev->hard_header!=NULL
b0e380b1
ACM		 116 mac_header -> ll header
117 data -> ll header
1da177e4
LT		 118
119Incoming, dev->hard_header==NULL
b0e380b1
ACM		 120 mac_header -> UNKNOWN position. It is very likely, that it points to ll
121 header. PPP makes it, that is wrong, because introduce
db0c58f9 122 assymetry between rx and tx paths.
b0e380b1 123 data -> data
1da177e4
LT		 124
125Outgoing, dev->hard_header==NULL
b0e380b1
ACM		 126 mac_header -> data. ll header is still not built!
127 data -> data
1da177e4
LT		 128
129Resume
130 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
131
132
133On transmit:
134------------
135
136dev->hard_header != NULL
b0e380b1
ACM		 137 mac_header -> ll header
138 data -> ll header
1da177e4
LT		 139
140dev->hard_header == NULL (ll header is added by device, we cannot control it)
b0e380b1
ACM		 141 mac_header -> data
142 data -> data
1da177e4
LT		 143
144 We should set nh.raw on output to correct posistion,
145 packet classifier depends on it.
146 */
147
1da177e4
LT		 148/* Private packet socket structures. */
149
40d4e3df 150struct packet_mclist {
1da177e4
LT		 151 struct packet_mclist *next;
152 int ifindex;
153 int count;
154 unsigned short type;
155 unsigned short alen;
0fb375fb
EB		 156 unsigned char addr[MAX_ADDR_LEN];
157};
158/* identical to struct packet_mreq except it has
159 * a longer address field.
160 */
40d4e3df 161struct packet_mreq_max {
0fb375fb
EB		 162 int mr_ifindex;
163 unsigned short mr_type;
164 unsigned short mr_alen;
165 unsigned char mr_address[MAX_ADDR_LEN];
1da177e4 166};
a2efcfa0 167
f6fb8f10 168static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
69e3c75f
JB		 169 int closing, int tx_ring);
170
f6fb8f10 171
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
179/* kbdq - kernel block descriptor queue */
bc59ba39 180struct tpacket_kbdq_core {
f6fb8f10 181 struct pgv *pkbdq;
182 unsigned int feature_req_word;
183 unsigned int hdrlen;
184 unsigned char reset_pending_on_curr_blk;
185 unsigned char delete_blk_timer;
186 unsigned short kactive_blk_num;
187 unsigned short blk_sizeof_priv;
188
189 /* last_kactive_blk_num:
190 * trick to see if user-space has caught up
191 * in order to avoid refreshing timer when every single pkt arrives.
192 */
193 unsigned short last_kactive_blk_num;
194
195 char *pkblk_start;
196 char *pkblk_end;
197 int kblk_size;
198 unsigned int knum_blocks;
199 uint64_t knxt_seq_num;
200 char *prev;
201 char *nxt_offset;
202 struct sk_buff *skb;
203
204 atomic_t blk_fill_in_prog;
205
206 /* Default is set to 8ms */
207#define DEFAULT_PRB_RETIRE_TOV (8)
208
209 unsigned short retire_blk_tov;
210 unsigned short version;
211 unsigned long tov_in_jiffies;
212
213 /* timer to retire an outstanding block */
214 struct timer_list retire_blk_timer;
215};
216
217#define PGV_FROM_VMALLOC 1
0e3125c7
NH		 218struct pgv {
219 char *buffer;
0e3125c7
NH		 220};
221
69e3c75f 222struct packet_ring_buffer {
0e3125c7 223 struct pgv *pg_vec;
69e3c75f
JB		 224 unsigned int head;
225 unsigned int frames_per_block;
226 unsigned int frame_size;
227 unsigned int frame_max;
228
229 unsigned int pg_vec_order;
230 unsigned int pg_vec_pages;
231 unsigned int pg_vec_len;
232
bc59ba39 233 struct tpacket_kbdq_core prb_bdqc;
69e3c75f
JB		 234 atomic_t pending;
235};
236
f6fb8f10 237#define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status)
238#define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts)
239#define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt)
240#define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len)
241#define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num)
242#define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
243#define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x)))
244
69e3c75f
JB		 245struct packet_sock;
246static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
1da177e4 247
f6fb8f10 248static void *packet_previous_frame(struct packet_sock *po,
249 struct packet_ring_buffer *rb,
250 int status);
251static void packet_increment_head(struct packet_ring_buffer *buff);
bc59ba39 252static int prb_curr_blk_in_use(struct tpacket_kbdq_core *,
253 struct tpacket_block_desc *);
254static void *prb_dispatch_next_block(struct tpacket_kbdq_core *,
f6fb8f10 255 struct packet_sock *);
bc59ba39 256static void prb_retire_current_block(struct tpacket_kbdq_core *,
f6fb8f10 257 struct packet_sock *, unsigned int status);
bc59ba39 258static int prb_queue_frozen(struct tpacket_kbdq_core *);
259static void prb_open_block(struct tpacket_kbdq_core *,
260 struct tpacket_block_desc *);
f6fb8f10 261static void prb_retire_rx_blk_timer_expired(unsigned long);
bc59ba39 262static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *);
263static void prb_init_blk_timer(struct packet_sock *,
264 struct tpacket_kbdq_core *,
265 void (*func) (unsigned long));
266static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *);
267static void prb_clear_rxhash(struct tpacket_kbdq_core *,
268 struct tpacket3_hdr *);
269static void prb_fill_vlan_info(struct tpacket_kbdq_core *,
270 struct tpacket3_hdr *);
1da177e4
LT		 271static void packet_flush_mclist(struct sock *sk);
272
dc99f600 273struct packet_fanout;
1da177e4
LT		 274struct packet_sock {
275 /* struct sock has to be the first member of packet_sock */
276 struct sock sk;
dc99f600 277 struct packet_fanout *fanout;
1da177e4 278 struct tpacket_stats stats;
f6fb8f10 279 union tpacket_stats_u stats_u;
69e3c75f
JB		 280 struct packet_ring_buffer rx_ring;
281 struct packet_ring_buffer tx_ring;
1da177e4 282 int copy_thresh;
1da177e4 283 spinlock_t bind_lock;
905db440 284 struct mutex pg_vec_lock;
8dc41944 285 unsigned int running:1, /* prot_hook is attached*/
80feaacb 286 auxdata:1,
bfd5f4a3
SS		 287 origdev:1,
288 has_vnet_hdr:1;
1da177e4 289 int ifindex; /* bound device */
0e11c91e 290 __be16 num;
1da177e4 291 struct packet_mclist *mclist;
1da177e4 292 atomic_t mapped;
bbd6ef87
PM		 293 enum tpacket_versions tp_version;
294 unsigned int tp_hdrlen;
8913336a 295 unsigned int tp_reserve;
69e3c75f 296 unsigned int tp_loss:1;
614f60fa 297 unsigned int tp_tstamp;
94b05952 298 struct packet_type prot_hook ____cacheline_aligned_in_smp;
1da177e4
LT		 299};
300
dc99f600
DM		 301#define PACKET_FANOUT_MAX 256
302
303struct packet_fanout {
304#ifdef CONFIG_NET_NS
305 struct net *net;
306#endif
307 unsigned int num_members;
308 u16 id;
309 u8 type;
7736d33f 310 u8 defrag;
dc99f600
DM		 311 atomic_t rr_cur;
312 struct list_head list;
313 struct sock *arr[PACKET_FANOUT_MAX];
314 spinlock_t lock;
315 atomic_t sk_ref;
316 struct packet_type prot_hook ____cacheline_aligned_in_smp;
317};
318
ffbc6111
HX		 319struct packet_skb_cb {
320 unsigned int origlen;
321 union {
322 struct sockaddr_pkt pkt;
323 struct sockaddr_ll ll;
324 } sa;
325};
326
327#define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
8dc41944 328
bc59ba39 329#define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
f6fb8f10 330#define GET_PBLOCK_DESC(x, bid) \
bc59ba39 331 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
f6fb8f10 332#define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
bc59ba39 333 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
f6fb8f10 334#define GET_NEXT_PRB_BLK_NUM(x) \
335 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
336 ((x)->kactive_blk_num+1) : 0)
337
eea49cc9 338static struct packet_sock *pkt_sk(struct sock *sk)
ce06b03e
DM		 339{
340 return (struct packet_sock *)sk;
341}
342
dc99f600
DM		 343static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
344static void __fanout_link(struct sock *sk, struct packet_sock *po);
345
ce06b03e
DM		 346/* register_prot_hook must be invoked with the po->bind_lock held,
347 * or from a context in which asynchronous accesses to the packet
348 * socket is not possible (packet_create()).
349 */
350static void register_prot_hook(struct sock *sk)
351{
352 struct packet_sock *po = pkt_sk(sk);
353 if (!po->running) {
dc99f600
DM		 354 if (po->fanout)
355 __fanout_link(sk, po);
356 else
357 dev_add_pack(&po->prot_hook);
ce06b03e
DM		 358 sock_hold(sk);
359 po->running = 1;
360 }
361}
362
363/* {,__}unregister_prot_hook() must be invoked with the po->bind_lock
364 * held. If the sync parameter is true, we will temporarily drop
365 * the po->bind_lock and do a synchronize_net to make sure no
366 * asynchronous packet processing paths still refer to the elements
367 * of po->prot_hook. If the sync parameter is false, it is the
368 * callers responsibility to take care of this.
369 */
370static void __unregister_prot_hook(struct sock *sk, bool sync)
371{
372 struct packet_sock *po = pkt_sk(sk);
373
374 po->running = 0;
dc99f600
DM		 375 if (po->fanout)
376 __fanout_unlink(sk, po);
377 else
378 __dev_remove_pack(&po->prot_hook);
ce06b03e
DM		 379 __sock_put(sk);
380
381 if (sync) {
382 spin_unlock(&po->bind_lock);
383 synchronize_net();
384 spin_lock(&po->bind_lock);
385 }
386}
387
388static void unregister_prot_hook(struct sock *sk, bool sync)
389{
390 struct packet_sock *po = pkt_sk(sk);
391
392 if (po->running)
393 __unregister_prot_hook(sk, sync);
394}
395
f6dafa95 396static inline __pure struct page *pgv_to_page(void *addr)
0af55bb5
CG		 397{
398 if (is_vmalloc_addr(addr))
399 return vmalloc_to_page(addr);
400 return virt_to_page(addr);
401}
402
69e3c75f 403static void __packet_set_status(struct packet_sock *po, void *frame, int status)
1da177e4 404{
bbd6ef87
PM		 405 union {
406 struct tpacket_hdr *h1;
407 struct tpacket2_hdr *h2;
408 void *raw;
409 } h;
1da177e4 410
69e3c75f 411 h.raw = frame;
bbd6ef87
PM		 412 switch (po->tp_version) {
413 case TPACKET_V1:
69e3c75f 414 h.h1->tp_status = status;
0af55bb5 415 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
bbd6ef87
PM		 416 break;
417 case TPACKET_V2:
69e3c75f 418 h.h2->tp_status = status;
0af55bb5 419 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
bbd6ef87 420 break;
f6fb8f10 421 case TPACKET_V3:
69e3c75f 422 default:
f6fb8f10 423 WARN(1, "TPACKET version not supported.\n");
69e3c75f 424 BUG();
bbd6ef87 425 }
69e3c75f
JB		 426
427 smp_wmb();
bbd6ef87
PM		 428}
429
69e3c75f 430static int __packet_get_status(struct packet_sock *po, void *frame)
bbd6ef87
PM		 431{
432 union {
433 struct tpacket_hdr *h1;
434 struct tpacket2_hdr *h2;
435 void *raw;
436 } h;
437
69e3c75f
JB		 438 smp_rmb();
439
bbd6ef87
PM		 440 h.raw = frame;
441 switch (po->tp_version) {
442 case TPACKET_V1:
0af55bb5 443 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
69e3c75f 444 return h.h1->tp_status;
bbd6ef87 445 case TPACKET_V2:
0af55bb5 446 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
69e3c75f 447 return h.h2->tp_status;
f6fb8f10 448 case TPACKET_V3:
69e3c75f 449 default:
f6fb8f10 450 WARN(1, "TPACKET version not supported.\n");
69e3c75f
JB		 451 BUG();
452 return 0;
bbd6ef87 453 }
1da177e4 454}
69e3c75f
JB		 455
456static void *packet_lookup_frame(struct packet_sock *po,
457 struct packet_ring_buffer *rb,
458 unsigned int position,
459 int status)
460{
461 unsigned int pg_vec_pos, frame_offset;
462 union {
463 struct tpacket_hdr *h1;
464 struct tpacket2_hdr *h2;
465 void *raw;
466 } h;
467
468 pg_vec_pos = position / rb->frames_per_block;
469 frame_offset = position % rb->frames_per_block;
470
0e3125c7
NH		 471 h.raw = rb->pg_vec[pg_vec_pos].buffer +
472 (frame_offset * rb->frame_size);
69e3c75f
JB		 473
474 if (status != __packet_get_status(po, h.raw))
475 return NULL;
476
477 return h.raw;
478}
479
eea49cc9 480static void *packet_current_frame(struct packet_sock *po,
69e3c75f
JB		 481 struct packet_ring_buffer *rb,
482 int status)
483{
484 return packet_lookup_frame(po, rb, rb->head, status);
485}
486
bc59ba39 487static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc)
f6fb8f10 488{
489 del_timer_sync(&pkc->retire_blk_timer);
490}
491
492static void prb_shutdown_retire_blk_timer(struct packet_sock *po,
493 int tx_ring,
494 struct sk_buff_head *rb_queue)
495{
bc59ba39 496 struct tpacket_kbdq_core *pkc;
f6fb8f10 497
498 pkc = tx_ring ? &po->tx_ring.prb_bdqc : &po->rx_ring.prb_bdqc;
499
500 spin_lock(&rb_queue->lock);
501 pkc->delete_blk_timer = 1;
502 spin_unlock(&rb_queue->lock);
503
504 prb_del_retire_blk_timer(pkc);
505}
506
507static void prb_init_blk_timer(struct packet_sock *po,
bc59ba39 508 struct tpacket_kbdq_core *pkc,
f6fb8f10 509 void (*func) (unsigned long))
510{
511 init_timer(&pkc->retire_blk_timer);
512 pkc->retire_blk_timer.data = (long)po;
513 pkc->retire_blk_timer.function = func;
514 pkc->retire_blk_timer.expires = jiffies;
515}
516
517static void prb_setup_retire_blk_timer(struct packet_sock *po, int tx_ring)
518{
bc59ba39 519 struct tpacket_kbdq_core *pkc;
f6fb8f10 520
521 if (tx_ring)
522 BUG();
523
524 pkc = tx_ring ? &po->tx_ring.prb_bdqc : &po->rx_ring.prb_bdqc;
525 prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired);
526}
527
528static int prb_calc_retire_blk_tmo(struct packet_sock *po,
529 int blk_size_in_bytes)
530{
531 struct net_device *dev;
532 unsigned int mbits = 0, msec = 0, div = 0, tmo = 0;
4bc71cb9
JP		 533 struct ethtool_cmd ecmd;
534 int err;
f6fb8f10 535
4bc71cb9
JP		 536 rtnl_lock();
537 dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex);
538 if (unlikely(!dev)) {
539 rtnl_unlock();
f6fb8f10 540 return DEFAULT_PRB_RETIRE_TOV;
4bc71cb9
JP		 541 }
542 err = __ethtool_get_settings(dev, &ecmd);
543 rtnl_unlock();
544 if (!err) {
545 switch (ecmd.speed) {
546 case SPEED_10000:
547 msec = 1;
548 div = 10000/1000;
549 break;
550 case SPEED_1000:
551 msec = 1;
552 div = 1000/1000;
553 break;
554 /*
555 * If the link speed is so slow you don't really
556 * need to worry about perf anyways
557 */
558 case SPEED_100:
559 case SPEED_10:
560 default:
561 return DEFAULT_PRB_RETIRE_TOV;
f6fb8f10 562 }
563 }
564
565 mbits = (blk_size_in_bytes * 8) / (1024 * 1024);
566
567 if (div)
568 mbits /= div;
569
570 tmo = mbits * msec;
571
572 if (div)
573 return tmo+1;
574 return tmo;
575}
576
bc59ba39 577static void prb_init_ft_ops(struct tpacket_kbdq_core *p1,
f6fb8f10 578 union tpacket_req_u *req_u)
579{
580 p1->feature_req_word = req_u->req3.tp_feature_req_word;
581}
582
583static void init_prb_bdqc(struct packet_sock *po,
584 struct packet_ring_buffer *rb,
585 struct pgv *pg_vec,
586 union tpacket_req_u *req_u, int tx_ring)
587{
bc59ba39 588 struct tpacket_kbdq_core *p1 = &rb->prb_bdqc;
589 struct tpacket_block_desc *pbd;
f6fb8f10 590
591 memset(p1, 0x0, sizeof(*p1));
592
593 p1->knxt_seq_num = 1;
594 p1->pkbdq = pg_vec;
bc59ba39 595 pbd = (struct tpacket_block_desc *)pg_vec[0].buffer;
f6fb8f10 596 p1->pkblk_start = (char *)pg_vec[0].buffer;
597 p1->kblk_size = req_u->req3.tp_block_size;
598 p1->knum_blocks = req_u->req3.tp_block_nr;
599 p1->hdrlen = po->tp_hdrlen;
600 p1->version = po->tp_version;
601 p1->last_kactive_blk_num = 0;
602 po->stats_u.stats3.tp_freeze_q_cnt = 0;
603 if (req_u->req3.tp_retire_blk_tov)
604 p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov;
605 else
606 p1->retire_blk_tov = prb_calc_retire_blk_tmo(po,
607 req_u->req3.tp_block_size);
608 p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov);
609 p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv;
610
611 prb_init_ft_ops(p1, req_u);
612 prb_setup_retire_blk_timer(po, tx_ring);
613 prb_open_block(p1, pbd);
614}
615
616/* Do NOT update the last_blk_num first.
617 * Assumes sk_buff_head lock is held.
618 */
bc59ba39 619static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc)
f6fb8f10 620{
621 mod_timer(&pkc->retire_blk_timer,
622 jiffies + pkc->tov_in_jiffies);
623 pkc->last_kactive_blk_num = pkc->kactive_blk_num;
624}
625
626/*
627 * Timer logic:
628 * 1) We refresh the timer only when we open a block.
629 * By doing this we don't waste cycles refreshing the timer
630 * on packet-by-packet basis.
631 *
632 * With a 1MB block-size, on a 1Gbps line, it will take
633 * i) ~8 ms to fill a block + ii) memcpy etc.
634 * In this cut we are not accounting for the memcpy time.
635 *
636 * So, if the user sets the 'tmo' to 10ms then the timer
637 * will never fire while the block is still getting filled
638 * (which is what we want). However, the user could choose
639 * to close a block early and that's fine.
640 *
641 * But when the timer does fire, we check whether or not to refresh it.
642 * Since the tmo granularity is in msecs, it is not too expensive
643 * to refresh the timer, lets say every '8' msecs.
644 * Either the user can set the 'tmo' or we can derive it based on
645 * a) line-speed and b) block-size.
646 * prb_calc_retire_blk_tmo() calculates the tmo.
647 *
648 */
649static void prb_retire_rx_blk_timer_expired(unsigned long data)
650{
651 struct packet_sock *po = (struct packet_sock *)data;
bc59ba39 652 struct tpacket_kbdq_core *pkc = &po->rx_ring.prb_bdqc;
f6fb8f10 653 unsigned int frozen;
bc59ba39 654 struct tpacket_block_desc *pbd;
f6fb8f10 655
656 spin_lock(&po->sk.sk_receive_queue.lock);
657
658 frozen = prb_queue_frozen(pkc);
659 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
660
661 if (unlikely(pkc->delete_blk_timer))
662 goto out;
663
664 /* We only need to plug the race when the block is partially filled.
665 * tpacket_rcv:
666 * lock(); increment BLOCK_NUM_PKTS; unlock()
667 * copy_bits() is in progress ...
668 * timer fires on other cpu:
669 * we can't retire the current block because copy_bits
670 * is in progress.
671 *
672 */
673 if (BLOCK_NUM_PKTS(pbd)) {
674 while (atomic_read(&pkc->blk_fill_in_prog)) {
675 /* Waiting for skb_copy_bits to finish... */
676 cpu_relax();
677 }
678 }
679
680 if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) {
681 if (!frozen) {
682 prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO);
683 if (!prb_dispatch_next_block(pkc, po))
684 goto refresh_timer;
685 else
686 goto out;
687 } else {
688 /* Case 1. Queue was frozen because user-space was
689 * lagging behind.
690 */
691 if (prb_curr_blk_in_use(pkc, pbd)) {
692 /*
693 * Ok, user-space is still behind.
694 * So just refresh the timer.
695 */
696 goto refresh_timer;
697 } else {
698 /* Case 2. queue was frozen,user-space caught up,
699 * now the link went idle && the timer fired.
700 * We don't have a block to close.So we open this
701 * block and restart the timer.
702 * opening a block thaws the queue,restarts timer
703 * Thawing/timer-refresh is a side effect.
704 */
705 prb_open_block(pkc, pbd);
706 goto out;
707 }
708 }
709 }
710
711refresh_timer:
712 _prb_refresh_rx_retire_blk_timer(pkc);
713
714out:
715 spin_unlock(&po->sk.sk_receive_queue.lock);
716}
717
eea49cc9 718static void prb_flush_block(struct tpacket_kbdq_core *pkc1,
bc59ba39 719 struct tpacket_block_desc *pbd1, __u32 status)
f6fb8f10 720{
721 /* Flush everything minus the block header */
722
723#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
724 u8 *start, *end;
725
726 start = (u8 *)pbd1;
727
728 /* Skip the block header(we know header WILL fit in 4K) */
729 start += PAGE_SIZE;
730
731 end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end);
732 for (; start < end; start += PAGE_SIZE)
733 flush_dcache_page(pgv_to_page(start));
734
735 smp_wmb();
736#endif
737
738 /* Now update the block status. */
739
740 BLOCK_STATUS(pbd1) = status;
741
742 /* Flush the block header */
743
744#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
745 start = (u8 *)pbd1;
746 flush_dcache_page(pgv_to_page(start));
747
748 smp_wmb();
749#endif
750}
751
752/*
753 * Side effect:
754 *
755 * 1) flush the block
756 * 2) Increment active_blk_num
757 *
758 * Note:We DONT refresh the timer on purpose.
759 * Because almost always the next block will be opened.
760 */
bc59ba39 761static void prb_close_block(struct tpacket_kbdq_core *pkc1,
762 struct tpacket_block_desc *pbd1,
f6fb8f10 763 struct packet_sock *po, unsigned int stat)
764{
765 __u32 status = TP_STATUS_USER | stat;
766
767 struct tpacket3_hdr *last_pkt;
bc59ba39 768 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
f6fb8f10 769
770 if (po->stats.tp_drops)
771 status |= TP_STATUS_LOSING;
772
773 last_pkt = (struct tpacket3_hdr *)pkc1->prev;
774 last_pkt->tp_next_offset = 0;
775
776 /* Get the ts of the last pkt */
777 if (BLOCK_NUM_PKTS(pbd1)) {
778 h1->ts_last_pkt.ts_sec = last_pkt->tp_sec;
779 h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec;
780 } else {
781 /* Ok, we tmo'd - so get the current time */
782 struct timespec ts;
783 getnstimeofday(&ts);
784 h1->ts_last_pkt.ts_sec = ts.tv_sec;
785 h1->ts_last_pkt.ts_nsec = ts.tv_nsec;
786 }
787
788 smp_wmb();
789
790 /* Flush the block */
791 prb_flush_block(pkc1, pbd1, status);
792
793 pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1);
794}
795
eea49cc9 796static void prb_thaw_queue(struct tpacket_kbdq_core *pkc)
f6fb8f10 797{
798 pkc->reset_pending_on_curr_blk = 0;
799}
800
801/*
802 * Side effect of opening a block:
803 *
804 * 1) prb_queue is thawed.
805 * 2) retire_blk_timer is refreshed.
806 *
807 */
bc59ba39 808static void prb_open_block(struct tpacket_kbdq_core *pkc1,
809 struct tpacket_block_desc *pbd1)
f6fb8f10 810{
811 struct timespec ts;
bc59ba39 812 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
f6fb8f10 813
814 smp_rmb();
815
816 if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd1))) {
817
818 /* We could have just memset this but we will lose the
819 * flexibility of making the priv area sticky
820 */
821 BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++;
822 BLOCK_NUM_PKTS(pbd1) = 0;
823 BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
824 getnstimeofday(&ts);
825 h1->ts_first_pkt.ts_sec = ts.tv_sec;
826 h1->ts_first_pkt.ts_nsec = ts.tv_nsec;
827 pkc1->pkblk_start = (char *)pbd1;
828 pkc1->nxt_offset = (char *)(pkc1->pkblk_start +
829 BLK_PLUS_PRIV(pkc1->blk_sizeof_priv));
830 BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
831 BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN;
832 pbd1->version = pkc1->version;
833 pkc1->prev = pkc1->nxt_offset;
834 pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size;
835 prb_thaw_queue(pkc1);
836 _prb_refresh_rx_retire_blk_timer(pkc1);
837
838 smp_wmb();
839
840 return;
841 }
842
843 WARN(1, "ERROR block:%p is NOT FREE status:%d kactive_blk_num:%d\n",
844 pbd1, BLOCK_STATUS(pbd1), pkc1->kactive_blk_num);
845 dump_stack();
846 BUG();
847}
848
849/*
850 * Queue freeze logic:
851 * 1) Assume tp_block_nr = 8 blocks.
852 * 2) At time 't0', user opens Rx ring.
853 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
854 * 4) user-space is either sleeping or processing block '0'.
855 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
856 * it will close block-7,loop around and try to fill block '0'.
857 * call-flow:
858 * __packet_lookup_frame_in_block
859 * prb_retire_current_block()
860 * prb_dispatch_next_block()
861 * |->(BLOCK_STATUS == USER) evaluates to true
862 * 5.1) Since block-0 is currently in-use, we just freeze the queue.
863 * 6) Now there are two cases:
864 * 6.1) Link goes idle right after the queue is frozen.
865 * But remember, the last open_block() refreshed the timer.
866 * When this timer expires,it will refresh itself so that we can
867 * re-open block-0 in near future.
868 * 6.2) Link is busy and keeps on receiving packets. This is a simple
869 * case and __packet_lookup_frame_in_block will check if block-0
870 * is free and can now be re-used.
871 */
eea49cc9 872static void prb_freeze_queue(struct tpacket_kbdq_core *pkc,
f6fb8f10 873 struct packet_sock *po)
874{
875 pkc->reset_pending_on_curr_blk = 1;
876 po->stats_u.stats3.tp_freeze_q_cnt++;
877}
878
879#define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
880
881/*
882 * If the next block is free then we will dispatch it
883 * and return a good offset.
884 * Else, we will freeze the queue.
885 * So, caller must check the return value.
886 */
bc59ba39 887static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc,
f6fb8f10 888 struct packet_sock *po)
889{
bc59ba39 890 struct tpacket_block_desc *pbd;
f6fb8f10 891
892 smp_rmb();
893
894 /* 1. Get current block num */
895 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
896
897 /* 2. If this block is currently in_use then freeze the queue */
898 if (TP_STATUS_USER & BLOCK_STATUS(pbd)) {
899 prb_freeze_queue(pkc, po);
900 return NULL;
901 }
902
903 /*
904 * 3.
905 * open this block and return the offset where the first packet
906 * needs to get stored.
907 */
908 prb_open_block(pkc, pbd);
909 return (void *)pkc->nxt_offset;
910}
911
bc59ba39 912static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
f6fb8f10 913 struct packet_sock *po, unsigned int status)
914{
bc59ba39 915 struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
f6fb8f10 916
917 /* retire/close the current block */
918 if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) {
919 /*
920 * Plug the case where copy_bits() is in progress on
921 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
922 * have space to copy the pkt in the current block and
923 * called prb_retire_current_block()
924 *
925 * We don't need to worry about the TMO case because
926 * the timer-handler already handled this case.
927 */
928 if (!(status & TP_STATUS_BLK_TMO)) {
929 while (atomic_read(&pkc->blk_fill_in_prog)) {
930 /* Waiting for skb_copy_bits to finish... */
931 cpu_relax();
932 }
933 }
934 prb_close_block(pkc, pbd, po, status);
935 return;
936 }
937
938 WARN(1, "ERROR-pbd[%d]:%p\n", pkc->kactive_blk_num, pbd);
939 dump_stack();
940 BUG();
941}
942
eea49cc9 943static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc,
bc59ba39 944 struct tpacket_block_desc *pbd)
f6fb8f10 945{
946 return TP_STATUS_USER & BLOCK_STATUS(pbd);
947}
948
eea49cc9 949static int prb_queue_frozen(struct tpacket_kbdq_core *pkc)
f6fb8f10 950{
951 return pkc->reset_pending_on_curr_blk;
952}
953
eea49cc9 954static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb)
f6fb8f10 955{
bc59ba39 956 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
f6fb8f10 957 atomic_dec(&pkc->blk_fill_in_prog);
958}
959
eea49cc9 960static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc,
f6fb8f10 961 struct tpacket3_hdr *ppd)
962{
963 ppd->hv1.tp_rxhash = skb_get_rxhash(pkc->skb);
964}
965
eea49cc9 966static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc,
f6fb8f10 967 struct tpacket3_hdr *ppd)
968{
969 ppd->hv1.tp_rxhash = 0;
970}
971
eea49cc9 972static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
f6fb8f10 973 struct tpacket3_hdr *ppd)
974{
975 if (vlan_tx_tag_present(pkc->skb)) {
976 ppd->hv1.tp_vlan_tci = vlan_tx_tag_get(pkc->skb);
977 ppd->tp_status = TP_STATUS_VLAN_VALID;
978 } else {
979 ppd->hv1.tp_vlan_tci = ppd->tp_status = 0;
980 }
981}
982
bc59ba39 983static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc,
f6fb8f10 984 struct tpacket3_hdr *ppd)
985{
986 prb_fill_vlan_info(pkc, ppd);
987
988 if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH)
989 prb_fill_rxhash(pkc, ppd);
990 else
991 prb_clear_rxhash(pkc, ppd);
992}
993
eea49cc9 994static void prb_fill_curr_block(char *curr,
bc59ba39 995 struct tpacket_kbdq_core *pkc,
996 struct tpacket_block_desc *pbd,
f6fb8f10 997 unsigned int len)
998{
999 struct tpacket3_hdr *ppd;
1000
1001 ppd = (struct tpacket3_hdr *)curr;
1002 ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len);
1003 pkc->prev = curr;
1004 pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len);
1005 BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len);
1006 BLOCK_NUM_PKTS(pbd) += 1;
1007 atomic_inc(&pkc->blk_fill_in_prog);
1008 prb_run_all_ft_ops(pkc, ppd);
1009}
1010
1011/* Assumes caller has the sk->rx_queue.lock */
1012static void *__packet_lookup_frame_in_block(struct packet_sock *po,
1013 struct sk_buff *skb,
1014 int status,
1015 unsigned int len
1016 )
1017{
bc59ba39 1018 struct tpacket_kbdq_core *pkc;
1019 struct tpacket_block_desc *pbd;
f6fb8f10 1020 char *curr, *end;
1021
1022 pkc = GET_PBDQC_FROM_RB(((struct packet_ring_buffer *)&po->rx_ring));
1023 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1024
1025 /* Queue is frozen when user space is lagging behind */
1026 if (prb_queue_frozen(pkc)) {
1027 /*
1028 * Check if that last block which caused the queue to freeze,
1029 * is still in_use by user-space.
1030 */
1031 if (prb_curr_blk_in_use(pkc, pbd)) {
1032 /* Can't record this packet */
1033 return NULL;
1034 } else {
1035 /*
1036 * Ok, the block was released by user-space.
1037 * Now let's open that block.
1038 * opening a block also thaws the queue.
1039 * Thawing is a side effect.
1040 */
1041 prb_open_block(pkc, pbd);
1042 }
1043 }
1044
1045 smp_mb();
1046 curr = pkc->nxt_offset;
1047 pkc->skb = skb;
1048 end = (char *) ((char *)pbd + pkc->kblk_size);
1049
1050 /* first try the current block */
1051 if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) {
1052 prb_fill_curr_block(curr, pkc, pbd, len);
1053 return (void *)curr;
1054 }
1055
1056 /* Ok, close the current block */
1057 prb_retire_current_block(pkc, po, 0);
1058
1059 /* Now, try to dispatch the next block */
1060 curr = (char *)prb_dispatch_next_block(pkc, po);
1061 if (curr) {
1062 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1063 prb_fill_curr_block(curr, pkc, pbd, len);
1064 return (void *)curr;
1065 }
1066
1067 /*
1068 * No free blocks are available.user_space hasn't caught up yet.
1069 * Queue was just frozen and now this packet will get dropped.
1070 */
1071 return NULL;
1072}
1073
eea49cc9 1074static void *packet_current_rx_frame(struct packet_sock *po,
f6fb8f10 1075 struct sk_buff *skb,
1076 int status, unsigned int len)
1077{
1078 char *curr = NULL;
1079 switch (po->tp_version) {
1080 case TPACKET_V1:
1081 case TPACKET_V2:
1082 curr = packet_lookup_frame(po, &po->rx_ring,
1083 po->rx_ring.head, status);
1084 return curr;
1085 case TPACKET_V3:
1086 return __packet_lookup_frame_in_block(po, skb, status, len);
1087 default:
1088 WARN(1, "TPACKET version not supported\n");
1089 BUG();
1090 return 0;
1091 }
1092}
1093
eea49cc9 1094static void *prb_lookup_block(struct packet_sock *po,
f6fb8f10 1095 struct packet_ring_buffer *rb,
1096 unsigned int previous,
1097 int status)
1098{
bc59ba39 1099 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
1100 struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, previous);
f6fb8f10 1101
1102 if (status != BLOCK_STATUS(pbd))
1103 return NULL;
1104 return pbd;
1105}
1106
eea49cc9 1107static int prb_previous_blk_num(struct packet_ring_buffer *rb)
f6fb8f10 1108{
1109 unsigned int prev;
1110 if (rb->prb_bdqc.kactive_blk_num)
1111 prev = rb->prb_bdqc.kactive_blk_num-1;
1112 else
1113 prev = rb->prb_bdqc.knum_blocks-1;
1114 return prev;
1115}
1116
1117/* Assumes caller has held the rx_queue.lock */
eea49cc9 1118static void *__prb_previous_block(struct packet_sock *po,
f6fb8f10 1119 struct packet_ring_buffer *rb,
1120 int status)
1121{
1122 unsigned int previous = prb_previous_blk_num(rb);
1123 return prb_lookup_block(po, rb, previous, status);
1124}
1125
eea49cc9 1126static void *packet_previous_rx_frame(struct packet_sock *po,
f6fb8f10 1127 struct packet_ring_buffer *rb,
1128 int status)
1129{
1130 if (po->tp_version <= TPACKET_V2)
1131 return packet_previous_frame(po, rb, status);
1132
1133 return __prb_previous_block(po, rb, status);
1134}
1135
eea49cc9 1136static void packet_increment_rx_head(struct packet_sock *po,
f6fb8f10 1137 struct packet_ring_buffer *rb)
1138{
1139 switch (po->tp_version) {
1140 case TPACKET_V1:
1141 case TPACKET_V2:
1142 return packet_increment_head(rb);
1143 case TPACKET_V3:
1144 default:
1145 WARN(1, "TPACKET version not supported.\n");
1146 BUG();
1147 return;
1148 }
1149}
1150
eea49cc9 1151static void *packet_previous_frame(struct packet_sock *po,
69e3c75f
JB		 1152 struct packet_ring_buffer *rb,
1153 int status)
1154{
1155 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
1156 return packet_lookup_frame(po, rb, previous, status);
1157}
1158
eea49cc9 1159static void packet_increment_head(struct packet_ring_buffer *buff)
69e3c75f
JB		 1160{
1161 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
1162}
1163
1da177e4
LT		 1164static void packet_sock_destruct(struct sock *sk)
1165{
ed85b565
RC		 1166 skb_queue_purge(&sk->sk_error_queue);
1167
547b792c
IJ		 1168 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
1169 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
1da177e4
LT		 1170
1171 if (!sock_flag(sk, SOCK_DEAD)) {
40d4e3df 1172 pr_err("Attempt to release alive packet socket: %p\n", sk);
1da177e4
LT		 1173 return;
1174 }
1175
17ab56a2 1176 sk_refcnt_debug_dec(sk);
1da177e4
LT		 1177}
1178
dc99f600
DM		 1179static int fanout_rr_next(struct packet_fanout *f, unsigned int num)
1180{
1181 int x = atomic_read(&f->rr_cur) + 1;
1182
1183 if (x >= num)
1184 x = 0;
1185
1186 return x;
1187}
1188
1189static struct sock *fanout_demux_hash(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
1190{
1191 u32 idx, hash = skb->rxhash;
1192
1193 idx = ((u64)hash * num) >> 32;
1194
1195 return f->arr[idx];
1196}
1197
1198static struct sock *fanout_demux_lb(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
1199{
1200 int cur, old;
1201
1202 cur = atomic_read(&f->rr_cur);
1203 while ((old = atomic_cmpxchg(&f->rr_cur, cur,
1204 fanout_rr_next(f, num))) != cur)
1205 cur = old;
1206 return f->arr[cur];
1207}
1208
95ec3eb4
DM		 1209static struct sock *fanout_demux_cpu(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
1210{
1211 unsigned int cpu = smp_processor_id();
1212
1213 return f->arr[cpu % num];
1214}
1215
95ec3eb4
DM		 1216static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
1217 struct packet_type *pt, struct net_device *orig_dev)
dc99f600
DM		 1218{
1219 struct packet_fanout *f = pt->af_packet_priv;
1220 unsigned int num = f->num_members;
1221 struct packet_sock *po;
1222 struct sock *sk;
1223
1224 if (!net_eq(dev_net(dev), read_pnet(&f->net)) ||
1225 !num) {
1226 kfree_skb(skb);
1227 return 0;
1228 }
1229
95ec3eb4
DM		 1230 switch (f->type) {
1231 case PACKET_FANOUT_HASH:
1232 default:
1233 if (f->defrag) {
bc416d97 1234 skb = ip_check_defrag(skb, IP_DEFRAG_AF_PACKET);
95ec3eb4
DM		 1235 if (!skb)
1236 return 0;
1237 }
1238 skb_get_rxhash(skb);
1239 sk = fanout_demux_hash(f, skb, num);
1240 break;
1241 case PACKET_FANOUT_LB:
1242 sk = fanout_demux_lb(f, skb, num);
1243 break;
1244 case PACKET_FANOUT_CPU:
1245 sk = fanout_demux_cpu(f, skb, num);
1246 break;
dc99f600
DM		 1247 }
1248
dc99f600
DM		 1249 po = pkt_sk(sk);
1250
1251 return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
1252}
1253
1254static DEFINE_MUTEX(fanout_mutex);
1255static LIST_HEAD(fanout_list);
1256
1257static void __fanout_link(struct sock *sk, struct packet_sock *po)
1258{
1259 struct packet_fanout *f = po->fanout;
1260
1261 spin_lock(&f->lock);
1262 f->arr[f->num_members] = sk;
1263 smp_wmb();
1264 f->num_members++;
1265 spin_unlock(&f->lock);
1266}
1267
1268static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
1269{
1270 struct packet_fanout *f = po->fanout;
1271 int i;
1272
1273 spin_lock(&f->lock);
1274 for (i = 0; i < f->num_members; i++) {
1275 if (f->arr[i] == sk)
1276 break;
1277 }
1278 BUG_ON(i >= f->num_members);
1279 f->arr[i] = f->arr[f->num_members - 1];
1280 f->num_members--;
1281 spin_unlock(&f->lock);
1282}
1283
7736d33f 1284static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
dc99f600
DM		 1285{
1286 struct packet_sock *po = pkt_sk(sk);
1287 struct packet_fanout *f, *match;
7736d33f
DM		 1288 u8 type = type_flags & 0xff;
1289 u8 defrag = (type_flags & PACKET_FANOUT_FLAG_DEFRAG) ? 1 : 0;
dc99f600
DM		 1290 int err;
1291
1292 switch (type) {
1293 case PACKET_FANOUT_HASH:
1294 case PACKET_FANOUT_LB:
95ec3eb4 1295 case PACKET_FANOUT_CPU:
dc99f600
DM		 1296 break;
1297 default:
1298 return -EINVAL;
1299 }
1300
1301 if (!po->running)
1302 return -EINVAL;
1303
1304 if (po->fanout)
1305 return -EALREADY;
1306
1307 mutex_lock(&fanout_mutex);
1308 match = NULL;
1309 list_for_each_entry(f, &fanout_list, list) {
1310 if (f->id == id &&
1311 read_pnet(&f->net) == sock_net(sk)) {
1312 match = f;
1313 break;
1314 }
1315 }
afe62c68 1316 err = -EINVAL;
7736d33f 1317 if (match && match->defrag != defrag)
afe62c68 1318 goto out;
dc99f600 1319 if (!match) {
afe62c68 1320 err = -ENOMEM;
dc99f600 1321 match = kzalloc(sizeof(*match), GFP_KERNEL);
afe62c68
ED		 1322 if (!match)
1323 goto out;
1324 write_pnet(&match->net, sock_net(sk));
1325 match->id = id;
1326 match->type = type;
1327 match->defrag = defrag;
1328 atomic_set(&match->rr_cur, 0);
1329 INIT_LIST_HEAD(&match->list);
1330 spin_lock_init(&match->lock);
1331 atomic_set(&match->sk_ref, 0);
1332 match->prot_hook.type = po->prot_hook.type;
1333 match->prot_hook.dev = po->prot_hook.dev;
1334 match->prot_hook.func = packet_rcv_fanout;
1335 match->prot_hook.af_packet_priv = match;
1336 dev_add_pack(&match->prot_hook);
1337 list_add(&match->list, &fanout_list);
dc99f600 1338 }
afe62c68
ED		 1339 err = -EINVAL;
1340 if (match->type == type &&
1341 match->prot_hook.type == po->prot_hook.type &&
1342 match->prot_hook.dev == po->prot_hook.dev) {
1343 err = -ENOSPC;
1344 if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
1345 __dev_remove_pack(&po->prot_hook);
1346 po->fanout = match;
1347 atomic_inc(&match->sk_ref);
1348 __fanout_link(sk, po);
1349 err = 0;
dc99f600
DM		 1350 }
1351 }
afe62c68 1352out:
dc99f600
DM		 1353 mutex_unlock(&fanout_mutex);
1354 return err;
1355}
1356
1357static void fanout_release(struct sock *sk)
1358{
1359 struct packet_sock *po = pkt_sk(sk);
1360 struct packet_fanout *f;
1361
1362 f = po->fanout;
1363 if (!f)
1364 return;
1365
1366 po->fanout = NULL;
1367
1368 mutex_lock(&fanout_mutex);
1369 if (atomic_dec_and_test(&f->sk_ref)) {
1370 list_del(&f->list);
1371 dev_remove_pack(&f->prot_hook);
1372 kfree(f);
1373 }
1374 mutex_unlock(&fanout_mutex);
1375}
1da177e4 1376
90ddc4f0 1377static const struct proto_ops packet_ops;
1da177e4 1378
90ddc4f0 1379static const struct proto_ops packet_ops_spkt;
1da177e4 1380
40d4e3df
ED		 1381static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
1382 struct packet_type *pt, struct net_device *orig_dev)
1da177e4
LT		 1383{
1384 struct sock *sk;
1385 struct sockaddr_pkt *spkt;
1386
1387 /*
1388 * When we registered the protocol we saved the socket in the data
1389 * field for just this event.
1390 */
1391
1392 sk = pt->af_packet_priv;
1ce4f28b 1393
1da177e4
LT		 1394 /*
1395 * Yank back the headers [hope the device set this
1396 * right or kerboom...]
1397 *
1398 * Incoming packets have ll header pulled,
1399 * push it back.
1400 *
98e399f8 1401 * For outgoing ones skb->data == skb_mac_header(skb)
1da177e4
LT		 1402 * so that this procedure is noop.
1403 */
1404
1405 if (skb->pkt_type == PACKET_LOOPBACK)
1406 goto out;
1407
09ad9bc7 1408 if (!net_eq(dev_net(dev), sock_net(sk)))
d12d01d6
DL		 1409 goto out;
1410
40d4e3df
ED		 1411 skb = skb_share_check(skb, GFP_ATOMIC);
1412 if (skb == NULL)
1da177e4
LT		 1413 goto oom;
1414
1415 /* drop any routing info */
adf30907 1416 skb_dst_drop(skb);
1da177e4 1417
84531c24
PO		 1418 /* drop conntrack reference */
1419 nf_reset(skb);
1420
ffbc6111 1421 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
1da177e4 1422
98e399f8 1423 skb_push(skb, skb->data - skb_mac_header(skb));
1da177e4
LT		 1424
1425 /*
1426 * The SOCK_PACKET socket receives _all_ frames.
1427 */
1428
1429 spkt->spkt_family = dev->type;
1430 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
1431 spkt->spkt_protocol = skb->protocol;
1432
1433 /*
1434 * Charge the memory to the socket. This is done specifically
1435 * to prevent sockets using all the memory up.
1436 */
1437
40d4e3df 1438 if (sock_queue_rcv_skb(sk, skb) == 0)
1da177e4
LT		 1439 return 0;
1440
1441out:
1442 kfree_skb(skb);
1443oom:
1444 return 0;
1445}
1446
1447
1448/*
1449 * Output a raw packet to a device layer. This bypasses all the other
1450 * protocol layers and you must therefore supply it with a complete frame
1451 */
1ce4f28b 1452
1da177e4
LT		 1453static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
1454 struct msghdr *msg, size_t len)
1455{
1456 struct sock *sk = sock->sk;
40d4e3df 1457 struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
1a35ca80 1458 struct sk_buff *skb = NULL;
1da177e4 1459 struct net_device *dev;
40d4e3df 1460 __be16 proto = 0;
1da177e4 1461 int err;
1ce4f28b 1462
1da177e4 1463 /*
1ce4f28b 1464 * Get and verify the address.
1da177e4
LT		 1465 */
1466
40d4e3df 1467 if (saddr) {
1da177e4 1468 if (msg->msg_namelen < sizeof(struct sockaddr))
40d4e3df
ED		 1469 return -EINVAL;
1470 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
1471 proto = saddr->spkt_protocol;
1472 } else
1473 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
1da177e4
LT		 1474
1475 /*
1ce4f28b 1476 * Find the device first to size check it
1da177e4
LT		 1477 */
1478
1479 saddr->spkt_device[13] = 0;
1a35ca80 1480retry:
654d1f8a
ED		 1481 rcu_read_lock();
1482 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
1da177e4
LT		 1483 err = -ENODEV;
1484 if (dev == NULL)
1485 goto out_unlock;
1ce4f28b 1486
d5e76b0a
DM		 1487 err = -ENETDOWN;
1488 if (!(dev->flags & IFF_UP))
1489 goto out_unlock;
1490
1da177e4 1491 /*
40d4e3df
ED		 1492 * You may not queue a frame bigger than the mtu. This is the lowest level
1493 * raw protocol and you must do your own fragmentation at this level.
1da177e4 1494 */
1ce4f28b 1495
1da177e4 1496 err = -EMSGSIZE;
57f89bfa 1497 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN)
1da177e4
LT		 1498 goto out_unlock;
1499
1a35ca80
ED		 1500 if (!skb) {
1501 size_t reserved = LL_RESERVED_SPACE(dev);
1502 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
1503
1504 rcu_read_unlock();
1505 skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL);
1506 if (skb == NULL)
1507 return -ENOBUFS;
1508 /* FIXME: Save some space for broken drivers that write a hard
1509 * header at transmission time by themselves. PPP is the notable
1510 * one here. This should really be fixed at the driver level.
1511 */
1512 skb_reserve(skb, reserved);
1513 skb_reset_network_header(skb);
1514
1515 /* Try to align data part correctly */
1516 if (hhlen) {
1517 skb->data -= hhlen;
1518 skb->tail -= hhlen;
1519 if (len < hhlen)
1520 skb_reset_network_header(skb);
1521 }
1522 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1523 if (err)
1524 goto out_free;
1525 goto retry;
1da177e4
LT		 1526 }
1527
57f89bfa
BG		 1528 if (len > (dev->mtu + dev->hard_header_len)) {
1529 /* Earlier code assumed this would be a VLAN pkt,
1530 * double-check this now that we have the actual
1531 * packet in hand.
1532 */
1533 struct ethhdr *ehdr;
1534 skb_reset_mac_header(skb);
1535 ehdr = eth_hdr(skb);
1536 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
1537 err = -EMSGSIZE;
1538 goto out_unlock;
1539 }
1540 }
1a35ca80 1541
1da177e4
LT		 1542 skb->protocol = proto;
1543 skb->dev = dev;
1544 skb->priority = sk->sk_priority;
2d37a186 1545 skb->mark = sk->sk_mark;
2244d07b 1546 err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
ed85b565
RC		 1547 if (err < 0)
1548 goto out_unlock;
1da177e4
LT		 1549
1550 dev_queue_xmit(skb);
654d1f8a 1551 rcu_read_unlock();
40d4e3df 1552 return len;
1da177e4 1553
1da177e4 1554out_unlock:
654d1f8a 1555 rcu_read_unlock();
1a35ca80
ED		 1556out_free:
1557 kfree_skb(skb);
1da177e4
LT		 1558 return err;
1559}
1da177e4 1560
eea49cc9 1561static unsigned int run_filter(const struct sk_buff *skb,
62ab0812 1562 const struct sock *sk,
dbcb5855 1563 unsigned int res)
1da177e4
LT		 1564{
1565 struct sk_filter *filter;
fda9ef5d 1566
80f8f102
ED		 1567 rcu_read_lock();
1568 filter = rcu_dereference(sk->sk_filter);
dbcb5855 1569 if (filter != NULL)
0a14842f 1570 res = SK_RUN_FILTER(filter, skb);
80f8f102 1571 rcu_read_unlock();
1da177e4 1572
dbcb5855 1573 return res;
1da177e4
LT		 1574}
1575
1576/*
62ab0812
ED		 1577 * This function makes lazy skb cloning in hope that most of packets
1578 * are discarded by BPF.
1579 *
1580 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
1581 * and skb->cb are mangled. It works because (and until) packets
1582 * falling here are owned by current CPU. Output packets are cloned
1583 * by dev_queue_xmit_nit(), input packets are processed by net_bh
1584 * sequencially, so that if we return skb to original state on exit,
1585 * we will not harm anyone.
1da177e4
LT		 1586 */
1587
40d4e3df
ED		 1588static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
1589 struct packet_type *pt, struct net_device *orig_dev)
1da177e4
LT		 1590{
1591 struct sock *sk;
1592 struct sockaddr_ll *sll;
1593 struct packet_sock *po;
40d4e3df 1594 u8 *skb_head = skb->data;
1da177e4 1595 int skb_len = skb->len;
dbcb5855 1596 unsigned int snaplen, res;
1da177e4
LT		 1597
1598 if (skb->pkt_type == PACKET_LOOPBACK)
1599 goto drop;
1600
1601 sk = pt->af_packet_priv;
1602 po = pkt_sk(sk);
1603
09ad9bc7 1604 if (!net_eq(dev_net(dev), sock_net(sk)))
d12d01d6
DL		 1605 goto drop;
1606
1da177e4
LT		 1607 skb->dev = dev;
1608
3b04ddde 1609 if (dev->header_ops) {
1da177e4 1610 /* The device has an explicit notion of ll header,
62ab0812
ED		 1611 * exported to higher levels.
1612 *
1613 * Otherwise, the device hides details of its frame
1614 * structure, so that corresponding packet head is
1615 * never delivered to user.
1da177e4
LT		 1616 */
1617 if (sk->sk_type != SOCK_DGRAM)
98e399f8 1618 skb_push(skb, skb->data - skb_mac_header(skb));
1da177e4
LT		 1619 else if (skb->pkt_type == PACKET_OUTGOING) {
1620 /* Special case: outgoing packets have ll header at head */
bbe735e4 1621 skb_pull(skb, skb_network_offset(skb));
1da177e4
LT		 1622 }
1623 }
1624
1625 snaplen = skb->len;
1626
dbcb5855
DM		 1627 res = run_filter(skb, sk, snaplen);
1628 if (!res)
fda9ef5d 1629 goto drop_n_restore;
dbcb5855
DM		 1630 if (snaplen > res)
1631 snaplen = res;
1da177e4
LT		 1632
1633 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
1634 (unsigned)sk->sk_rcvbuf)
1635 goto drop_n_acct;
1636
1637 if (skb_shared(skb)) {
1638 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
1639 if (nskb == NULL)
1640 goto drop_n_acct;
1641
1642 if (skb_head != skb->data) {
1643 skb->data = skb_head;
1644 skb->len = skb_len;
1645 }
1646 kfree_skb(skb);
1647 skb = nskb;
1648 }
1649
ffbc6111
HX		 1650 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
1651 sizeof(skb->cb));
1652
1653 sll = &PACKET_SKB_CB(skb)->sa.ll;
1da177e4
LT		 1654 sll->sll_family = AF_PACKET;
1655 sll->sll_hatype = dev->type;
1656 sll->sll_protocol = skb->protocol;
1657 sll->sll_pkttype = skb->pkt_type;
8032b464 1658 if (unlikely(po->origdev))
80feaacb
PWJ		 1659 sll->sll_ifindex = orig_dev->ifindex;
1660 else
1661 sll->sll_ifindex = dev->ifindex;
1da177e4 1662
b95cce35 1663 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
1da177e4 1664
ffbc6111 1665 PACKET_SKB_CB(skb)->origlen = skb->len;
8dc41944 1666
1da177e4
LT		 1667 if (pskb_trim(skb, snaplen))
1668 goto drop_n_acct;
1669
1670 skb_set_owner_r(skb, sk);
1671 skb->dev = NULL;
adf30907 1672 skb_dst_drop(skb);
1da177e4 1673
84531c24
PO		 1674 /* drop conntrack reference */
1675 nf_reset(skb);
1676
1da177e4
LT		 1677 spin_lock(&sk->sk_receive_queue.lock);
1678 po->stats.tp_packets++;
3b885787 1679 skb->dropcount = atomic_read(&sk->sk_drops);
1da177e4
LT		 1680 __skb_queue_tail(&sk->sk_receive_queue, skb);
1681 spin_unlock(&sk->sk_receive_queue.lock);
1682 sk->sk_data_ready(sk, skb->len);
1683 return 0;
1684
1685drop_n_acct:
7091fbd8
WB		 1686 spin_lock(&sk->sk_receive_queue.lock);
1687 po->stats.tp_drops++;
1688 atomic_inc(&sk->sk_drops);
1689 spin_unlock(&sk->sk_receive_queue.lock);
1da177e4
LT		 1690
1691drop_n_restore:
1692 if (skb_head != skb->data && skb_shared(skb)) {
1693 skb->data = skb_head;
1694 skb->len = skb_len;
1695 }
1696drop:
ead2ceb0 1697 consume_skb(skb);
1da177e4
LT		 1698 return 0;
1699}
1700
40d4e3df
ED		 1701static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
1702 struct packet_type *pt, struct net_device *orig_dev)
1da177e4
LT		 1703{
1704 struct sock *sk;
1705 struct packet_sock *po;
1706 struct sockaddr_ll *sll;
bbd6ef87
PM		 1707 union {
1708 struct tpacket_hdr *h1;
1709 struct tpacket2_hdr *h2;
f6fb8f10 1710 struct tpacket3_hdr *h3;
bbd6ef87
PM		 1711 void *raw;
1712 } h;
40d4e3df 1713 u8 *skb_head = skb->data;
1da177e4 1714 int skb_len = skb->len;
dbcb5855 1715 unsigned int snaplen, res;
f6fb8f10 1716 unsigned long status = TP_STATUS_USER;
bbd6ef87 1717 unsigned short macoff, netoff, hdrlen;
1da177e4 1718 struct sk_buff *copy_skb = NULL;
b7aa0bf7 1719 struct timeval tv;
bbd6ef87 1720 struct timespec ts;
614f60fa 1721 struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
1da177e4
LT		 1722
1723 if (skb->pkt_type == PACKET_LOOPBACK)
1724 goto drop;
1725
1726 sk = pt->af_packet_priv;
1727 po = pkt_sk(sk);
1728
09ad9bc7 1729 if (!net_eq(dev_net(dev), sock_net(sk)))
d12d01d6
DL		 1730 goto drop;
1731
3b04ddde 1732 if (dev->header_ops) {
1da177e4 1733 if (sk->sk_type != SOCK_DGRAM)
98e399f8 1734 skb_push(skb, skb->data - skb_mac_header(skb));
1da177e4
LT		 1735 else if (skb->pkt_type == PACKET_OUTGOING) {
1736 /* Special case: outgoing packets have ll header at head */
bbe735e4 1737 skb_pull(skb, skb_network_offset(skb));
1da177e4
LT		 1738 }
1739 }
1740
8dc41944
HX		 1741 if (skb->ip_summed == CHECKSUM_PARTIAL)
1742 status |= TP_STATUS_CSUMNOTREADY;
1743
1da177e4
LT		 1744 snaplen = skb->len;
1745
dbcb5855
DM		 1746 res = run_filter(skb, sk, snaplen);
1747 if (!res)
fda9ef5d 1748 goto drop_n_restore;
dbcb5855
DM		 1749 if (snaplen > res)
1750 snaplen = res;
1da177e4
LT		 1751
1752 if (sk->sk_type == SOCK_DGRAM) {
8913336a
PM		 1753 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
1754 po->tp_reserve;
1da177e4 1755 } else {
bbe735e4 1756 unsigned maclen = skb_network_offset(skb);
bbd6ef87 1757 netoff = TPACKET_ALIGN(po->tp_hdrlen +
8913336a
PM		 1758 (maclen < 16 ? 16 : maclen)) +
1759 po->tp_reserve;
1da177e4
LT		 1760 macoff = netoff - maclen;
1761 }
f6fb8f10 1762 if (po->tp_version <= TPACKET_V2) {
1763 if (macoff + snaplen > po->rx_ring.frame_size) {
1764 if (po->copy_thresh &&
1765 atomic_read(&sk->sk_rmem_alloc) + skb->truesize
1766 < (unsigned)sk->sk_rcvbuf) {
1767 if (skb_shared(skb)) {
1768 copy_skb = skb_clone(skb, GFP_ATOMIC);
1769 } else {
1770 copy_skb = skb_get(skb);
1771 skb_head = skb->data;
1772 }
1773 if (copy_skb)
1774 skb_set_owner_r(copy_skb, sk);
1da177e4 1775 }
f6fb8f10 1776 snaplen = po->rx_ring.frame_size - macoff;
1777 if ((int)snaplen < 0)
1778 snaplen = 0;
1da177e4 1779 }
1da177e4 1780 }
1da177e4 1781 spin_lock(&sk->sk_receive_queue.lock);
f6fb8f10 1782 h.raw = packet_current_rx_frame(po, skb,
1783 TP_STATUS_KERNEL, (macoff+snaplen));
bbd6ef87 1784 if (!h.raw)
1da177e4 1785 goto ring_is_full;
f6fb8f10 1786 if (po->tp_version <= TPACKET_V2) {
1787 packet_increment_rx_head(po, &po->rx_ring);
1788 /*
1789 * LOSING will be reported till you read the stats,
1790 * because it's COR - Clear On Read.
1791 * Anyways, moving it for V1/V2 only as V3 doesn't need this
1792 * at packet level.
1793 */
1794 if (po->stats.tp_drops)
1795 status |= TP_STATUS_LOSING;
1796 }
1da177e4
LT		 1797 po->stats.tp_packets++;
1798 if (copy_skb) {
1799 status |= TP_STATUS_COPY;
1800 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
1801 }
1da177e4
LT		 1802 spin_unlock(&sk->sk_receive_queue.lock);
1803
bbd6ef87 1804 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
1da177e4 1805
bbd6ef87
PM		 1806 switch (po->tp_version) {
1807 case TPACKET_V1:
1808 h.h1->tp_len = skb->len;
1809 h.h1->tp_snaplen = snaplen;
1810 h.h1->tp_mac = macoff;
1811 h.h1->tp_net = netoff;
614f60fa
SM		 1812 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
1813 && shhwtstamps->syststamp.tv64)
1814 tv = ktime_to_timeval(shhwtstamps->syststamp);
1815 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
1816 && shhwtstamps->hwtstamp.tv64)
1817 tv = ktime_to_timeval(shhwtstamps->hwtstamp);
1818 else if (skb->tstamp.tv64)
bbd6ef87
PM		 1819 tv = ktime_to_timeval(skb->tstamp);
1820 else
1821 do_gettimeofday(&tv);
1822 h.h1->tp_sec = tv.tv_sec;
1823 h.h1->tp_usec = tv.tv_usec;
1824 hdrlen = sizeof(*h.h1);
1825 break;
1826 case TPACKET_V2:
1827 h.h2->tp_len = skb->len;
1828 h.h2->tp_snaplen = snaplen;
1829 h.h2->tp_mac = macoff;
1830 h.h2->tp_net = netoff;
614f60fa
SM		 1831 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
1832 && shhwtstamps->syststamp.tv64)
1833 ts = ktime_to_timespec(shhwtstamps->syststamp);
1834 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
1835 && shhwtstamps->hwtstamp.tv64)
1836 ts = ktime_to_timespec(shhwtstamps->hwtstamp);
1837 else if (skb->tstamp.tv64)
bbd6ef87
PM		 1838 ts = ktime_to_timespec(skb->tstamp);
1839 else
1840 getnstimeofday(&ts);
1841 h.h2->tp_sec = ts.tv_sec;
1842 h.h2->tp_nsec = ts.tv_nsec;
a3bcc23e
BG		 1843 if (vlan_tx_tag_present(skb)) {
1844 h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
1845 status |= TP_STATUS_VLAN_VALID;
1846 } else {
1847 h.h2->tp_vlan_tci = 0;
1848 }
13fcb7bd 1849 h.h2->tp_padding = 0;
bbd6ef87
PM		 1850 hdrlen = sizeof(*h.h2);
1851 break;
f6fb8f10 1852 case TPACKET_V3:
1853 /* tp_nxt_offset,vlan are already populated above.
1854 * So DONT clear those fields here
1855 */
1856 h.h3->tp_status |= status;
1857 h.h3->tp_len = skb->len;
1858 h.h3->tp_snaplen = snaplen;
1859 h.h3->tp_mac = macoff;
1860 h.h3->tp_net = netoff;
1861 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
1862 && shhwtstamps->syststamp.tv64)
1863 ts = ktime_to_timespec(shhwtstamps->syststamp);
1864 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
1865 && shhwtstamps->hwtstamp.tv64)
1866 ts = ktime_to_timespec(shhwtstamps->hwtstamp);
1867 else if (skb->tstamp.tv64)
1868 ts = ktime_to_timespec(skb->tstamp);
1869 else
1870 getnstimeofday(&ts);
1871 h.h3->tp_sec = ts.tv_sec;
1872 h.h3->tp_nsec = ts.tv_nsec;
1873 hdrlen = sizeof(*h.h3);
1874 break;
bbd6ef87
PM		 1875 default:
1876 BUG();
1877 }
1da177e4 1878
bbd6ef87 1879 sll = h.raw + TPACKET_ALIGN(hdrlen);
b95cce35 1880 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
1da177e4
LT		 1881 sll->sll_family = AF_PACKET;
1882 sll->sll_hatype = dev->type;
1883 sll->sll_protocol = skb->protocol;
1884 sll->sll_pkttype = skb->pkt_type;
8032b464 1885 if (unlikely(po->origdev))
80feaacb
PWJ		 1886 sll->sll_ifindex = orig_dev->ifindex;
1887 else
1888 sll->sll_ifindex = dev->ifindex;
1da177e4 1889
e16aa207 1890 smp_mb();
f6dafa95 1891#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
1da177e4 1892 {
0af55bb5
CG		 1893 u8 *start, *end;
1894
f6fb8f10 1895 if (po->tp_version <= TPACKET_V2) {
1896 end = (u8 *)PAGE_ALIGN((unsigned long)h.raw
1897 + macoff + snaplen);
1898 for (start = h.raw; start < end; start += PAGE_SIZE)
1899 flush_dcache_page(pgv_to_page(start));
1900 }
cc9f01b2 1901 smp_wmb();
1da177e4 1902 }
f6dafa95 1903#endif
f6fb8f10 1904 if (po->tp_version <= TPACKET_V2)
1905 __packet_set_status(po, h.raw, status);
1906 else
1907 prb_clear_blk_fill_status(&po->rx_ring);
1da177e4
LT		 1908
1909 sk->sk_data_ready(sk, 0);
1910
1911drop_n_restore:
1912 if (skb_head != skb->data && skb_shared(skb)) {
1913 skb->data = skb_head;
1914 skb->len = skb_len;
1915 }
1916drop:
1ce4f28b 1917 kfree_skb(skb);
1da177e4
LT		 1918 return 0;
1919
1920ring_is_full:
1921 po->stats.tp_drops++;
1922 spin_unlock(&sk->sk_receive_queue.lock);
1923
1924 sk->sk_data_ready(sk, 0);
acb5d75b 1925 kfree_skb(copy_skb);
1da177e4
LT		 1926 goto drop_n_restore;
1927}
1928
69e3c75f
JB		 1929static void tpacket_destruct_skb(struct sk_buff *skb)
1930{
1931 struct packet_sock *po = pkt_sk(skb->sk);
40d4e3df 1932 void *ph;
1da177e4 1933
69e3c75f
JB		 1934 if (likely(po->tx_ring.pg_vec)) {
1935 ph = skb_shinfo(skb)->destructor_arg;
1936 BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING);
1937 BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
1938 atomic_dec(&po->tx_ring.pending);
1939 __packet_set_status(po, ph, TP_STATUS_AVAILABLE);
1940 }
1941
1942 sock_wfree(skb);
1943}
1944
40d4e3df
ED		 1945static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
1946 void *frame, struct net_device *dev, int size_max,
1947 __be16 proto, unsigned char *addr)
69e3c75f
JB		 1948{
1949 union {
1950 struct tpacket_hdr *h1;
1951 struct tpacket2_hdr *h2;
1952 void *raw;
1953 } ph;
1954 int to_write, offset, len, tp_len, nr_frags, len_max;
1955 struct socket *sock = po->sk.sk_socket;
1956 struct page *page;
1957 void *data;
1958 int err;
1959
1960 ph.raw = frame;
1961
1962 skb->protocol = proto;
1963 skb->dev = dev;
1964 skb->priority = po->sk.sk_priority;
2d37a186 1965 skb->mark = po->sk.sk_mark;
69e3c75f
JB		 1966 skb_shinfo(skb)->destructor_arg = ph.raw;
1967
1968 switch (po->tp_version) {
1969 case TPACKET_V2:
1970 tp_len = ph.h2->tp_len;
1971 break;
1972 default:
1973 tp_len = ph.h1->tp_len;
1974 break;
1975 }
1976 if (unlikely(tp_len > size_max)) {
40d4e3df 1977 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
69e3c75f
JB		 1978 return -EMSGSIZE;
1979 }
1980
1981 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1982 skb_reset_network_header(skb);
1983
1984 data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
1985 to_write = tp_len;
1986
1987 if (sock->type == SOCK_DGRAM) {
1988 err = dev_hard_header(skb, dev, ntohs(proto), addr,
1989 NULL, tp_len);
1990 if (unlikely(err < 0))
1991 return -EINVAL;
40d4e3df 1992 } else if (dev->hard_header_len) {
69e3c75f
JB		 1993 /* net device doesn't like empty head */
1994 if (unlikely(tp_len <= dev->hard_header_len)) {
40d4e3df
ED		 1995 pr_err("packet size is too short (%d < %d)\n",
1996 tp_len, dev->hard_header_len);
69e3c75f
JB		 1997 return -EINVAL;
1998 }
1999
2000 skb_push(skb, dev->hard_header_len);
2001 err = skb_store_bits(skb, 0, data,
2002 dev->hard_header_len);
2003 if (unlikely(err))
2004 return err;
2005
2006 data += dev->hard_header_len;
2007 to_write -= dev->hard_header_len;
2008 }
2009
2010 err = -EFAULT;
69e3c75f
JB		 2011 offset = offset_in_page(data);
2012 len_max = PAGE_SIZE - offset;
2013 len = ((to_write > len_max) ? len_max : to_write);
2014
2015 skb->data_len = to_write;
2016 skb->len += to_write;
2017 skb->truesize += to_write;
2018 atomic_add(to_write, &po->sk.sk_wmem_alloc);
2019
2020 while (likely(to_write)) {
2021 nr_frags = skb_shinfo(skb)->nr_frags;
2022
2023 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
40d4e3df
ED		 2024 pr_err("Packet exceed the number of skb frags(%lu)\n",
2025 MAX_SKB_FRAGS);
69e3c75f
JB		 2026 return -EFAULT;
2027 }
2028
0af55bb5
CG		 2029 page = pgv_to_page(data);
2030 data += len;
69e3c75f
JB		 2031 flush_dcache_page(page);
2032 get_page(page);
0af55bb5 2033 skb_fill_page_desc(skb, nr_frags, page, offset, len);
69e3c75f
JB		 2034 to_write -= len;
2035 offset = 0;
2036 len_max = PAGE_SIZE;
2037 len = ((to_write > len_max) ? len_max : to_write);
2038 }
2039
2040 return tp_len;
2041}
2042
2043static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
2044{
69e3c75f
JB		 2045 struct sk_buff *skb;
2046 struct net_device *dev;
2047 __be16 proto;
827d9780
BG		 2048 bool need_rls_dev = false;
2049 int err, reserve = 0;
40d4e3df
ED		 2050 void *ph;
2051 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
69e3c75f
JB		 2052 int tp_len, size_max;
2053 unsigned char *addr;
2054 int len_sum = 0;
2055 int status = 0;
2056
69e3c75f
JB		 2057 mutex_lock(&po->pg_vec_lock);
2058
2059 err = -EBUSY;
2060 if (saddr == NULL) {
827d9780 2061 dev = po->prot_hook.dev;
69e3c75f
JB		 2062 proto = po->num;
2063 addr = NULL;
2064 } else {
2065 err = -EINVAL;
2066 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2067 goto out;
2068 if (msg->msg_namelen < (saddr->sll_halen
2069 + offsetof(struct sockaddr_ll,
2070 sll_addr)))
2071 goto out;
69e3c75f
JB		 2072 proto = saddr->sll_protocol;
2073 addr = saddr->sll_addr;
827d9780
BG		 2074 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
2075 need_rls_dev = true;
69e3c75f
JB		 2076 }
2077
69e3c75f
JB		 2078 err = -ENXIO;
2079 if (unlikely(dev == NULL))
2080 goto out;
2081
2082 reserve = dev->hard_header_len;
2083
2084 err = -ENETDOWN;
2085 if (unlikely(!(dev->flags & IFF_UP)))
2086 goto out_put;
2087
2088 size_max = po->tx_ring.frame_size
b5dd884e 2089 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
69e3c75f
JB		 2090
2091 if (size_max > dev->mtu + reserve)
2092 size_max = dev->mtu + reserve;
2093
2094 do {
2095 ph = packet_current_frame(po, &po->tx_ring,
2096 TP_STATUS_SEND_REQUEST);
2097
2098 if (unlikely(ph == NULL)) {
2099 schedule();
2100 continue;
2101 }
2102
2103 status = TP_STATUS_SEND_REQUEST;
2104 skb = sock_alloc_send_skb(&po->sk,
2105 LL_ALLOCATED_SPACE(dev)
2106 + sizeof(struct sockaddr_ll),
2107 0, &err);
2108
2109 if (unlikely(skb == NULL))
2110 goto out_status;
2111
2112 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
2113 addr);
2114
2115 if (unlikely(tp_len < 0)) {
2116 if (po->tp_loss) {
2117 __packet_set_status(po, ph,
2118 TP_STATUS_AVAILABLE);
2119 packet_increment_head(&po->tx_ring);
2120 kfree_skb(skb);
2121 continue;
2122 } else {
2123 status = TP_STATUS_WRONG_FORMAT;
2124 err = tp_len;
2125 goto out_status;
2126 }
2127 }
2128
2129 skb->destructor = tpacket_destruct_skb;
2130 __packet_set_status(po, ph, TP_STATUS_SENDING);
2131 atomic_inc(&po->tx_ring.pending);
2132
2133 status = TP_STATUS_SEND_REQUEST;
2134 err = dev_queue_xmit(skb);
eb70df13
JP		 2135 if (unlikely(err > 0)) {
2136 err = net_xmit_errno(err);
2137 if (err && __packet_get_status(po, ph) ==
2138 TP_STATUS_AVAILABLE) {
2139 /* skb was destructed already */
2140 skb = NULL;
2141 goto out_status;
2142 }
2143 /*
2144 * skb was dropped but not destructed yet;
2145 * let's treat it like congestion or err < 0
2146 */
2147 err = 0;
2148 }
69e3c75f
JB		 2149 packet_increment_head(&po->tx_ring);
2150 len_sum += tp_len;
f64f9e71
JP		 2151 } while (likely((ph != NULL) ||
2152 ((!(msg->msg_flags & MSG_DONTWAIT)) &&
2153 (atomic_read(&po->tx_ring.pending))))
2154 );
69e3c75f
JB		 2155
2156 err = len_sum;
2157 goto out_put;
2158
69e3c75f
JB		 2159out_status:
2160 __packet_set_status(po, ph, status);
2161 kfree_skb(skb);
2162out_put:
827d9780
BG		 2163 if (need_rls_dev)
2164 dev_put(dev);
69e3c75f
JB		 2165out:
2166 mutex_unlock(&po->pg_vec_lock);
2167 return err;
2168}
69e3c75f 2169
eea49cc9
OJ		 2170static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
2171 size_t reserve, size_t len,
2172 size_t linear, int noblock,
2173 int *err)
bfd5f4a3
SS		 2174{
2175 struct sk_buff *skb;
2176
2177 /* Under a page? Don't bother with paged skb. */
2178 if (prepad + len < PAGE_SIZE || !linear)
2179 linear = len;
2180
2181 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
2182 err);
2183 if (!skb)
2184 return NULL;
2185
2186 skb_reserve(skb, reserve);
2187 skb_put(skb, linear);
2188 skb->data_len = len - linear;
2189 skb->len += len - linear;
2190
2191 return skb;
2192}
2193
69e3c75f 2194static int packet_snd(struct socket *sock,
1da177e4
LT		 2195 struct msghdr *msg, size_t len)
2196{
2197 struct sock *sk = sock->sk;
40d4e3df 2198 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
1da177e4
LT		 2199 struct sk_buff *skb;
2200 struct net_device *dev;
0e11c91e 2201 __be16 proto;
827d9780 2202 bool need_rls_dev = false;
1da177e4 2203 unsigned char *addr;
827d9780 2204 int err, reserve = 0;
bfd5f4a3
SS		 2205 struct virtio_net_hdr vnet_hdr = { 0 };
2206 int offset = 0;
2207 int vnet_hdr_len;
2208 struct packet_sock *po = pkt_sk(sk);
2209 unsigned short gso_type = 0;
1da177e4
LT		 2210
2211 /*
1ce4f28b 2212 * Get and verify the address.
1da177e4 2213 */
1ce4f28b 2214
1da177e4 2215 if (saddr == NULL) {
827d9780 2216 dev = po->prot_hook.dev;
1da177e4
LT		 2217 proto = po->num;
2218 addr = NULL;
2219 } else {
2220 err = -EINVAL;
2221 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2222 goto out;
0fb375fb
EB		 2223 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
2224 goto out;
1da177e4
LT		 2225 proto = saddr->sll_protocol;
2226 addr = saddr->sll_addr;
827d9780
BG		 2227 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
2228 need_rls_dev = true;
1da177e4
LT		 2229 }
2230
1da177e4
LT		 2231 err = -ENXIO;
2232 if (dev == NULL)
2233 goto out_unlock;
2234 if (sock->type == SOCK_RAW)
2235 reserve = dev->hard_header_len;
2236
d5e76b0a
DM		 2237 err = -ENETDOWN;
2238 if (!(dev->flags & IFF_UP))
2239 goto out_unlock;
2240
bfd5f4a3
SS		 2241 if (po->has_vnet_hdr) {
2242 vnet_hdr_len = sizeof(vnet_hdr);
2243
2244 err = -EINVAL;
2245 if (len < vnet_hdr_len)
2246 goto out_unlock;
2247
2248 len -= vnet_hdr_len;
2249
2250 err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov,
2251 vnet_hdr_len);
2252 if (err < 0)
2253 goto out_unlock;
2254
2255 if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
2256 (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 >
2257 vnet_hdr.hdr_len))
2258 vnet_hdr.hdr_len = vnet_hdr.csum_start +
2259 vnet_hdr.csum_offset + 2;
2260
2261 err = -EINVAL;
2262 if (vnet_hdr.hdr_len > len)
2263 goto out_unlock;
2264
2265 if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2266 switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2267 case VIRTIO_NET_HDR_GSO_TCPV4:
2268 gso_type = SKB_GSO_TCPV4;
2269 break;
2270 case VIRTIO_NET_HDR_GSO_TCPV6:
2271 gso_type = SKB_GSO_TCPV6;
2272 break;
2273 case VIRTIO_NET_HDR_GSO_UDP:
2274 gso_type = SKB_GSO_UDP;
2275 break;
2276 default:
2277 goto out_unlock;
2278 }
2279
2280 if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
2281 gso_type |= SKB_GSO_TCP_ECN;
2282
2283 if (vnet_hdr.gso_size == 0)
2284 goto out_unlock;
2285
2286 }
2287 }
2288
1da177e4 2289 err = -EMSGSIZE;
57f89bfa 2290 if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN))
1da177e4
LT		 2291 goto out_unlock;
2292
bfd5f4a3
SS		 2293 err = -ENOBUFS;
2294 skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev),
2295 LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len,
2296 msg->msg_flags & MSG_DONTWAIT, &err);
40d4e3df 2297 if (skb == NULL)
1da177e4
LT		 2298 goto out_unlock;
2299
bfd5f4a3 2300 skb_set_network_header(skb, reserve);
1da177e4 2301
0c4e8581
SH		 2302 err = -EINVAL;
2303 if (sock->type == SOCK_DGRAM &&
bfd5f4a3 2304 (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0)
0c4e8581 2305 goto out_free;
1da177e4
LT		 2306
2307 /* Returns -EFAULT on error */
bfd5f4a3 2308 err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len);
1da177e4
LT		 2309 if (err)
2310 goto out_free;
2244d07b 2311 err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
ed85b565
RC		 2312 if (err < 0)
2313 goto out_free;
1da177e4 2314
57f89bfa
BG		 2315 if (!gso_type && (len > dev->mtu + reserve)) {
2316 /* Earlier code assumed this would be a VLAN pkt,
2317 * double-check this now that we have the actual
2318 * packet in hand.
2319 */
2320 struct ethhdr *ehdr;
2321 skb_reset_mac_header(skb);
2322 ehdr = eth_hdr(skb);
2323 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
2324 err = -EMSGSIZE;
2325 goto out_free;
2326 }
2327 }
2328
1da177e4
LT		 2329 skb->protocol = proto;
2330 skb->dev = dev;
2331 skb->priority = sk->sk_priority;
2d37a186 2332 skb->mark = sk->sk_mark;
1da177e4 2333
bfd5f4a3
SS		 2334 if (po->has_vnet_hdr) {
2335 if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
2336 if (!skb_partial_csum_set(skb, vnet_hdr.csum_start,
2337 vnet_hdr.csum_offset)) {
2338 err = -EINVAL;
2339 goto out_free;
2340 }
2341 }
2342
2343 skb_shinfo(skb)->gso_size = vnet_hdr.gso_size;
2344 skb_shinfo(skb)->gso_type = gso_type;
2345
2346 /* Header must be checked, and gso_segs computed. */
2347 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2348 skb_shinfo(skb)->gso_segs = 0;
2349
2350 len += vnet_hdr_len;
2351 }
2352
1da177e4
LT		 2353 /*
2354 * Now send it
2355 */
2356
2357 err = dev_queue_xmit(skb);
2358 if (err > 0 && (err = net_xmit_errno(err)) != 0)
2359 goto out_unlock;
2360
827d9780
BG		 2361 if (need_rls_dev)
2362 dev_put(dev);
1da177e4 2363
40d4e3df 2364 return len;
1da177e4
LT		 2365
2366out_free:
2367 kfree_skb(skb);
2368out_unlock:
827d9780 2369 if (dev && need_rls_dev)
1da177e4
LT		 2370 dev_put(dev);
2371out:
2372 return err;
2373}
2374
69e3c75f
JB		 2375static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
2376 struct msghdr *msg, size_t len)
2377{
69e3c75f
JB		 2378 struct sock *sk = sock->sk;
2379 struct packet_sock *po = pkt_sk(sk);
2380 if (po->tx_ring.pg_vec)
2381 return tpacket_snd(po, msg);
2382 else
69e3c75f
JB		 2383 return packet_snd(sock, msg, len);
2384}
2385
1da177e4
LT		 2386/*
2387 * Close a PACKET socket. This is fairly simple. We immediately go
2388 * to 'closed' state and remove our protocol entry in the device list.
2389 */
2390
2391static int packet_release(struct socket *sock)
2392{
2393 struct sock *sk = sock->sk;
2394 struct packet_sock *po;
d12d01d6 2395 struct net *net;
f6fb8f10 2396 union tpacket_req_u req_u;
1da177e4
LT		 2397
2398 if (!sk)
2399 return 0;
2400
3b1e0a65 2401 net = sock_net(sk);
1da177e4
LT		 2402 po = pkt_sk(sk);
2403
808f5114 2404 spin_lock_bh(&net->packet.sklist_lock);
2405 sk_del_node_init_rcu(sk);
920de804 2406 sock_prot_inuse_add(net, sk->sk_prot, -1);
808f5114 2407 spin_unlock_bh(&net->packet.sklist_lock);
1da177e4 2408
808f5114 2409 spin_lock(&po->bind_lock);
ce06b03e 2410 unregister_prot_hook(sk, false);
160ff18a
BG		 2411 if (po->prot_hook.dev) {
2412 dev_put(po->prot_hook.dev);
2413 po->prot_hook.dev = NULL;
2414 }
808f5114 2415 spin_unlock(&po->bind_lock);
1da177e4 2416
1da177e4 2417 packet_flush_mclist(sk);
1da177e4 2418
f6fb8f10 2419 memset(&req_u, 0, sizeof(req_u));
69e3c75f
JB		 2420
2421 if (po->rx_ring.pg_vec)
f6fb8f10 2422 packet_set_ring(sk, &req_u, 1, 0);
69e3c75f
JB		 2423
2424 if (po->tx_ring.pg_vec)
f6fb8f10 2425 packet_set_ring(sk, &req_u, 1, 1);
1da177e4 2426
dc99f600
DM		 2427 fanout_release(sk);
2428
808f5114 2429 synchronize_net();
1da177e4
LT		 2430 /*
2431 * Now the socket is dead. No more input will appear.
2432 */
1da177e4
LT		 2433 sock_orphan(sk);
2434 sock->sk = NULL;
2435
2436 /* Purge queues */
2437
2438 skb_queue_purge(&sk->sk_receive_queue);
17ab56a2 2439 sk_refcnt_debug_release(sk);
1da177e4
LT		 2440
2441 sock_put(sk);
2442 return 0;
2443}
2444
2445/*
2446 * Attach a packet hook.
2447 */
2448
0e11c91e 2449static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
1da177e4
LT		 2450{
2451 struct packet_sock *po = pkt_sk(sk);
dc99f600
DM		 2452
2453 if (po->fanout)
2454 return -EINVAL;
1da177e4
LT		 2455
2456 lock_sock(sk);
2457
2458 spin_lock(&po->bind_lock);
ce06b03e 2459 unregister_prot_hook(sk, true);
1da177e4
LT		 2460 po->num = protocol;
2461 po->prot_hook.type = protocol;
160ff18a
BG		 2462 if (po->prot_hook.dev)
2463 dev_put(po->prot_hook.dev);
1da177e4
LT		 2464 po->prot_hook.dev = dev;
2465
2466 po->ifindex = dev ? dev->ifindex : 0;
2467
2468 if (protocol == 0)
2469 goto out_unlock;
2470
be85d4ad 2471 if (!dev || (dev->flags & IFF_UP)) {
ce06b03e 2472 register_prot_hook(sk);
be85d4ad
UT		 2473 } else {
2474 sk->sk_err = ENETDOWN;
2475 if (!sock_flag(sk, SOCK_DEAD))
2476 sk->sk_error_report(sk);
1da177e4
LT		 2477 }
2478
2479out_unlock:
2480 spin_unlock(&po->bind_lock);
2481 release_sock(sk);
2482 return 0;
2483}
2484
2485/*
2486 * Bind a packet socket to a device
2487 */
2488
40d4e3df
ED		 2489static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
2490 int addr_len)
1da177e4 2491{
40d4e3df 2492 struct sock *sk = sock->sk;
1da177e4
LT		 2493 char name[15];
2494 struct net_device *dev;
2495 int err = -ENODEV;
1ce4f28b 2496
1da177e4
LT		 2497 /*
2498 * Check legality
2499 */
1ce4f28b 2500
8ae55f04 2501 if (addr_len != sizeof(struct sockaddr))
1da177e4 2502 return -EINVAL;
40d4e3df 2503 strlcpy(name, uaddr->sa_data, sizeof(name));
1da177e4 2504
3b1e0a65 2505 dev = dev_get_by_name(sock_net(sk), name);
160ff18a 2506 if (dev)
1da177e4 2507 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
1da177e4
LT		 2508 return err;
2509}
1da177e4
LT		 2510
2511static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
2512{
40d4e3df
ED		 2513 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
2514 struct sock *sk = sock->sk;
1da177e4
LT		 2515 struct net_device *dev = NULL;
2516 int err;
2517
2518
2519 /*
2520 * Check legality
2521 */
1ce4f28b 2522
1da177e4
LT		 2523 if (addr_len < sizeof(struct sockaddr_ll))
2524 return -EINVAL;
2525 if (sll->sll_family != AF_PACKET)
2526 return -EINVAL;
2527
2528 if (sll->sll_ifindex) {
2529 err = -ENODEV;
3b1e0a65 2530 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
1da177e4
LT		 2531 if (dev == NULL)
2532 goto out;
2533 }
2534 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
1da177e4
LT		 2535
2536out:
2537 return err;
2538}
2539
2540static struct proto packet_proto = {
2541 .name = "PACKET",
2542 .owner = THIS_MODULE,
2543 .obj_size = sizeof(struct packet_sock),
2544};
2545
2546/*
1ce4f28b 2547 * Create a packet of type SOCK_PACKET.
1da177e4
LT		 2548 */
2549
3f378b68
EP		 2550static int packet_create(struct net *net, struct socket *sock, int protocol,
2551 int kern)
1da177e4
LT		 2552{
2553 struct sock *sk;
2554 struct packet_sock *po;
0e11c91e 2555 __be16 proto = (__force __be16)protocol; /* weird, but documented */
1da177e4
LT		 2556 int err;
2557
2558 if (!capable(CAP_NET_RAW))
2559 return -EPERM;
be02097c
DM		 2560 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
2561 sock->type != SOCK_PACKET)
1da177e4
LT		 2562 return -ESOCKTNOSUPPORT;
2563
2564 sock->state = SS_UNCONNECTED;
2565
2566 err = -ENOBUFS;
6257ff21 2567 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
1da177e4
LT		 2568 if (sk == NULL)
2569 goto out;
2570
2571 sock->ops = &packet_ops;
1da177e4
LT		 2572 if (sock->type == SOCK_PACKET)
2573 sock->ops = &packet_ops_spkt;
be02097c 2574
1da177e4
LT		 2575 sock_init_data(sock, sk);
2576
2577 po = pkt_sk(sk);
2578 sk->sk_family = PF_PACKET;
0e11c91e 2579 po->num = proto;
1da177e4
LT		 2580
2581 sk->sk_destruct = packet_sock_destruct;
17ab56a2 2582 sk_refcnt_debug_inc(sk);
1da177e4
LT		 2583
2584 /*
2585 * Attach a protocol block
2586 */
2587
2588 spin_lock_init(&po->bind_lock);
905db440 2589 mutex_init(&po->pg_vec_lock);
1da177e4 2590 po->prot_hook.func = packet_rcv;
be02097c 2591
1da177e4
LT		 2592 if (sock->type == SOCK_PACKET)
2593 po->prot_hook.func = packet_rcv_spkt;
be02097c 2594
1da177e4
LT		 2595 po->prot_hook.af_packet_priv = sk;
2596
0e11c91e
AV		 2597 if (proto) {
2598 po->prot_hook.type = proto;
ce06b03e 2599 register_prot_hook(sk);
1da177e4
LT		 2600 }
2601
808f5114 2602 spin_lock_bh(&net->packet.sklist_lock);
2603 sk_add_node_rcu(sk, &net->packet.sklist);
3680453c 2604 sock_prot_inuse_add(net, &packet_proto, 1);
808f5114 2605 spin_unlock_bh(&net->packet.sklist_lock);
2606
40d4e3df 2607 return 0;
1da177e4
LT		 2608out:
2609 return err;
2610}
2611
ed85b565
RC		 2612static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len)
2613{
2614 struct sock_exterr_skb *serr;
2615 struct sk_buff *skb, *skb2;
2616 int copied, err;
2617
2618 err = -EAGAIN;
2619 skb = skb_dequeue(&sk->sk_error_queue);
2620 if (skb == NULL)
2621 goto out;
2622
2623 copied = skb->len;
2624 if (copied > len) {
2625 msg->msg_flags |= MSG_TRUNC;
2626 copied = len;
2627 }
2628 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2629 if (err)
2630 goto out_free_skb;
2631
2632 sock_recv_timestamp(msg, sk, skb);
2633
2634 serr = SKB_EXT_ERR(skb);
2635 put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP,
2636 sizeof(serr->ee), &serr->ee);
2637
2638 msg->msg_flags |= MSG_ERRQUEUE;
2639 err = copied;
2640
2641 /* Reset and regenerate socket error */
2642 spin_lock_bh(&sk->sk_error_queue.lock);
2643 sk->sk_err = 0;
2644 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
2645 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
2646 spin_unlock_bh(&sk->sk_error_queue.lock);
2647 sk->sk_error_report(sk);
2648 } else
2649 spin_unlock_bh(&sk->sk_error_queue.lock);
2650
2651out_free_skb:
2652 kfree_skb(skb);
2653out:
2654 return err;
2655}
2656
1da177e4
LT		 2657/*
2658 * Pull a packet from our receive queue and hand it to the user.
2659 * If necessary we block.
2660 */
2661
2662static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
2663 struct msghdr *msg, size_t len, int flags)
2664{
2665 struct sock *sk = sock->sk;
2666 struct sk_buff *skb;
2667 int copied, err;
0fb375fb 2668 struct sockaddr_ll *sll;
bfd5f4a3 2669 int vnet_hdr_len = 0;
1da177e4
LT		 2670
2671 err = -EINVAL;
ed85b565 2672 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
1da177e4
LT		 2673 goto out;
2674
2675#if 0
2676 /* What error should we return now? EUNATTACH? */
2677 if (pkt_sk(sk)->ifindex < 0)
2678 return -ENODEV;
2679#endif
2680
ed85b565
RC		 2681 if (flags & MSG_ERRQUEUE) {
2682 err = packet_recv_error(sk, msg, len);
2683 goto out;
2684 }
2685
1da177e4
LT		 2686 /*
2687 * Call the generic datagram receiver. This handles all sorts
2688 * of horrible races and re-entrancy so we can forget about it
2689 * in the protocol layers.
2690 *
2691 * Now it will return ENETDOWN, if device have just gone down,
2692 * but then it will block.
2693 */
2694
40d4e3df 2695 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
1da177e4
LT		 2696
2697 /*
1ce4f28b 2698 * An error occurred so return it. Because skb_recv_datagram()
1da177e4
LT		 2699 * handles the blocking we don't see and worry about blocking
2700 * retries.
2701 */
2702
8ae55f04 2703 if (skb == NULL)
1da177e4
LT		 2704 goto out;
2705
bfd5f4a3
SS		 2706 if (pkt_sk(sk)->has_vnet_hdr) {
2707 struct virtio_net_hdr vnet_hdr = { 0 };
2708
2709 err = -EINVAL;
2710 vnet_hdr_len = sizeof(vnet_hdr);
1f18b717 2711 if (len < vnet_hdr_len)
bfd5f4a3
SS		 2712 goto out_free;
2713
1f18b717
MK		 2714 len -= vnet_hdr_len;
2715
bfd5f4a3
SS		 2716 if (skb_is_gso(skb)) {
2717 struct skb_shared_info *sinfo = skb_shinfo(skb);
2718
2719 /* This is a hint as to how much should be linear. */
2720 vnet_hdr.hdr_len = skb_headlen(skb);
2721 vnet_hdr.gso_size = sinfo->gso_size;
2722 if (sinfo->gso_type & SKB_GSO_TCPV4)
2723 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
2724 else if (sinfo->gso_type & SKB_GSO_TCPV6)
2725 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
2726 else if (sinfo->gso_type & SKB_GSO_UDP)
2727 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
2728 else if (sinfo->gso_type & SKB_GSO_FCOE)
2729 goto out_free;
2730 else
2731 BUG();
2732 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
2733 vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
2734 } else
2735 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
2736
2737 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2738 vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
55508d60 2739 vnet_hdr.csum_start = skb_checksum_start_offset(skb);
bfd5f4a3 2740 vnet_hdr.csum_offset = skb->csum_offset;
10a8d94a
JW		 2741 } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
2742 vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID;
bfd5f4a3
SS		 2743 } /* else everything is zero */
2744
2745 err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr,
2746 vnet_hdr_len);
2747 if (err < 0)
2748 goto out_free;
2749 }
2750
0fb375fb
EB		 2751 /*
2752 * If the address length field is there to be filled in, we fill
2753 * it in now.
2754 */
2755
ffbc6111 2756 sll = &PACKET_SKB_CB(skb)->sa.ll;
0fb375fb
EB		 2757 if (sock->type == SOCK_PACKET)
2758 msg->msg_namelen = sizeof(struct sockaddr_pkt);
2759 else
2760 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
2761
1da177e4
LT		 2762 /*
2763 * You lose any data beyond the buffer you gave. If it worries a
2764 * user program they can ask the device for its MTU anyway.
2765 */
2766
2767 copied = skb->len;
40d4e3df
ED		 2768 if (copied > len) {
2769 copied = len;
2770 msg->msg_flags |= MSG_TRUNC;
1da177e4
LT		 2771 }
2772
2773 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2774 if (err)
2775 goto out_free;
2776
3b885787 2777 sock_recv_ts_and_drops(msg, sk, skb);
1da177e4
LT		 2778
2779 if (msg->msg_name)
ffbc6111
HX		 2780 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
2781 msg->msg_namelen);
1da177e4 2782
8dc41944 2783 if (pkt_sk(sk)->auxdata) {
ffbc6111
HX		 2784 struct tpacket_auxdata aux;
2785
2786 aux.tp_status = TP_STATUS_USER;
2787 if (skb->ip_summed == CHECKSUM_PARTIAL)
2788 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
2789 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
2790 aux.tp_snaplen = skb->len;
2791 aux.tp_mac = 0;
bbe735e4 2792 aux.tp_net = skb_network_offset(skb);
a3bcc23e
BG		 2793 if (vlan_tx_tag_present(skb)) {
2794 aux.tp_vlan_tci = vlan_tx_tag_get(skb);
2795 aux.tp_status |= TP_STATUS_VLAN_VALID;
2796 } else {
2797 aux.tp_vlan_tci = 0;
2798 }
13fcb7bd 2799 aux.tp_padding = 0;
ffbc6111 2800 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
8dc41944
HX		 2801 }
2802
1da177e4
LT		 2803 /*
2804 * Free or return the buffer as appropriate. Again this
2805 * hides all the races and re-entrancy issues from us.
2806 */
bfd5f4a3 2807 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
1da177e4
LT		 2808
2809out_free:
2810 skb_free_datagram(sk, skb);
2811out:
2812 return err;
2813}
2814
1da177e4
LT		 2815static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
2816 int *uaddr_len, int peer)
2817{
2818 struct net_device *dev;
2819 struct sock *sk = sock->sk;
2820
2821 if (peer)
2822 return -EOPNOTSUPP;
2823
2824 uaddr->sa_family = AF_PACKET;
654d1f8a
ED		 2825 rcu_read_lock();
2826 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
2827 if (dev)
67286640 2828 strncpy(uaddr->sa_data, dev->name, 14);
654d1f8a 2829 else
1da177e4 2830 memset(uaddr->sa_data, 0, 14);
654d1f8a 2831 rcu_read_unlock();
1da177e4
LT		 2832 *uaddr_len = sizeof(*uaddr);
2833
2834 return 0;
2835}
1da177e4
LT		 2836
2837static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
2838 int *uaddr_len, int peer)
2839{
2840 struct net_device *dev;
2841 struct sock *sk = sock->sk;
2842 struct packet_sock *po = pkt_sk(sk);
13cfa97b 2843 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
1da177e4
LT		 2844
2845 if (peer)
2846 return -EOPNOTSUPP;
2847
2848 sll->sll_family = AF_PACKET;
2849 sll->sll_ifindex = po->ifindex;
2850 sll->sll_protocol = po->num;
67286640 2851 sll->sll_pkttype = 0;
654d1f8a
ED		 2852 rcu_read_lock();
2853 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
1da177e4
LT		 2854 if (dev) {
2855 sll->sll_hatype = dev->type;
2856 sll->sll_halen = dev->addr_len;
2857 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
1da177e4
LT		 2858 } else {
2859 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
2860 sll->sll_halen = 0;
2861 }
654d1f8a 2862 rcu_read_unlock();
0fb375fb 2863 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
1da177e4
LT		 2864
2865 return 0;
2866}
2867
2aeb0b88
WC		 2868static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
2869 int what)
1da177e4
LT		 2870{
2871 switch (i->type) {
2872 case PACKET_MR_MULTICAST:
1162563f
JP		 2873 if (i->alen != dev->addr_len)
2874 return -EINVAL;
1da177e4 2875 if (what > 0)
22bedad3 2876 return dev_mc_add(dev, i->addr);
1da177e4 2877 else
22bedad3 2878 return dev_mc_del(dev, i->addr);
1da177e4
LT		 2879 break;
2880 case PACKET_MR_PROMISC:
2aeb0b88 2881 return dev_set_promiscuity(dev, what);
1da177e4
LT		 2882 break;
2883 case PACKET_MR_ALLMULTI:
2aeb0b88 2884 return dev_set_allmulti(dev, what);
1da177e4 2885 break;
d95ed927 2886 case PACKET_MR_UNICAST:
1162563f
JP		 2887 if (i->alen != dev->addr_len)
2888 return -EINVAL;
d95ed927 2889 if (what > 0)
a748ee24 2890 return dev_uc_add(dev, i->addr);
d95ed927 2891 else
a748ee24 2892 return dev_uc_del(dev, i->addr);
d95ed927 2893 break;
40d4e3df
ED		 2894 default:
2895 break;
1da177e4 2896 }
2aeb0b88 2897 return 0;
1da177e4
LT		 2898}
2899
2900static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
2901{
40d4e3df 2902 for ( ; i; i = i->next) {
1da177e4
LT		 2903 if (i->ifindex == dev->ifindex)
2904 packet_dev_mc(dev, i, what);
2905 }
2906}
2907
0fb375fb 2908static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
1da177e4
LT		 2909{
2910 struct packet_sock *po = pkt_sk(sk);
2911 struct packet_mclist *ml, *i;
2912 struct net_device *dev;
2913 int err;
2914
2915 rtnl_lock();
2916
2917 err = -ENODEV;
3b1e0a65 2918 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
1da177e4
LT		 2919 if (!dev)
2920 goto done;
2921
2922 err = -EINVAL;
1162563f 2923 if (mreq->mr_alen > dev->addr_len)
1da177e4
LT		 2924 goto done;
2925
2926 err = -ENOBUFS;
8b3a7005 2927 i = kmalloc(sizeof(*i), GFP_KERNEL);
1da177e4
LT		 2928 if (i == NULL)
2929 goto done;
2930
2931 err = 0;
2932 for (ml = po->mclist; ml; ml = ml->next) {
2933 if (ml->ifindex == mreq->mr_ifindex &&
2934 ml->type == mreq->mr_type &&
2935 ml->alen == mreq->mr_alen &&
2936 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
2937 ml->count++;
2938 /* Free the new element ... */
2939 kfree(i);
2940 goto done;
2941 }
2942 }
2943
2944 i->type = mreq->mr_type;
2945 i->ifindex = mreq->mr_ifindex;
2946 i->alen = mreq->mr_alen;
2947 memcpy(i->addr, mreq->mr_address, i->alen);
2948 i->count = 1;
2949 i->next = po->mclist;
2950 po->mclist = i;
2aeb0b88
WC		 2951 err = packet_dev_mc(dev, i, 1);
2952 if (err) {
2953 po->mclist = i->next;
2954 kfree(i);
2955 }
1da177e4
LT		 2956
2957done:
2958 rtnl_unlock();
2959 return err;
2960}
2961
0fb375fb 2962static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
1da177e4
LT		 2963{
2964 struct packet_mclist *ml, **mlp;
2965
2966 rtnl_lock();
2967
2968 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
2969 if (ml->ifindex == mreq->mr_ifindex &&
2970 ml->type == mreq->mr_type &&
2971 ml->alen == mreq->mr_alen &&
2972 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
2973 if (--ml->count == 0) {
2974 struct net_device *dev;
2975 *mlp = ml->next;
ad959e76
ED		 2976 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
2977 if (dev)
1da177e4 2978 packet_dev_mc(dev, ml, -1);
1da177e4
LT		 2979 kfree(ml);
2980 }
2981 rtnl_unlock();
2982 return 0;
2983 }
2984 }
2985 rtnl_unlock();
2986 return -EADDRNOTAVAIL;
2987}
2988
2989static void packet_flush_mclist(struct sock *sk)
2990{
2991 struct packet_sock *po = pkt_sk(sk);
2992 struct packet_mclist *ml;
2993
2994 if (!po->mclist)
2995 return;
2996
2997 rtnl_lock();
2998 while ((ml = po->mclist) != NULL) {
2999 struct net_device *dev;
3000
3001 po->mclist = ml->next;
ad959e76
ED		 3002 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3003 if (dev != NULL)
1da177e4 3004 packet_dev_mc(dev, ml, -1);
1da177e4
LT		 3005 kfree(ml);
3006 }
3007 rtnl_unlock();
3008}
1da177e4
LT		 3009
3010static int
b7058842 3011packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 3012{
3013 struct sock *sk = sock->sk;
8dc41944 3014 struct packet_sock *po = pkt_sk(sk);
1da177e4
LT		 3015 int ret;
3016
3017 if (level != SOL_PACKET)
3018 return -ENOPROTOOPT;
3019
69e3c75f 3020 switch (optname) {
1ce4f28b 3021 case PACKET_ADD_MEMBERSHIP:
1da177e4
LT		 3022 case PACKET_DROP_MEMBERSHIP:
3023 {
0fb375fb
EB		 3024 struct packet_mreq_max mreq;
3025 int len = optlen;
3026 memset(&mreq, 0, sizeof(mreq));
3027 if (len < sizeof(struct packet_mreq))
1da177e4 3028 return -EINVAL;
0fb375fb
EB		 3029 if (len > sizeof(mreq))
3030 len = sizeof(mreq);
40d4e3df 3031 if (copy_from_user(&mreq, optval, len))
1da177e4 3032 return -EFAULT;
0fb375fb
EB		 3033 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
3034 return -EINVAL;
1da177e4
LT		 3035 if (optname == PACKET_ADD_MEMBERSHIP)
3036 ret = packet_mc_add(sk, &mreq);
3037 else
3038 ret = packet_mc_drop(sk, &mreq);
3039 return ret;
3040 }
a2efcfa0 3041
1da177e4 3042 case PACKET_RX_RING:
69e3c75f 3043 case PACKET_TX_RING:
1da177e4 3044 {
f6fb8f10 3045 union tpacket_req_u req_u;
3046 int len;
1da177e4 3047
f6fb8f10 3048 switch (po->tp_version) {
3049 case TPACKET_V1:
3050 case TPACKET_V2:
3051 len = sizeof(req_u.req);
3052 break;
3053 case TPACKET_V3:
3054 default:
3055 len = sizeof(req_u.req3);
3056 break;
3057 }
3058 if (optlen < len)
1da177e4 3059 return -EINVAL;
bfd5f4a3
SS		 3060 if (pkt_sk(sk)->has_vnet_hdr)
3061 return -EINVAL;
f6fb8f10 3062 if (copy_from_user(&req_u.req, optval, len))
1da177e4 3063 return -EFAULT;
f6fb8f10 3064 return packet_set_ring(sk, &req_u, 0,
3065 optname == PACKET_TX_RING);
1da177e4
LT		 3066 }
3067 case PACKET_COPY_THRESH:
3068 {
3069 int val;
3070
40d4e3df 3071 if (optlen != sizeof(val))
1da177e4 3072 return -EINVAL;
40d4e3df 3073 if (copy_from_user(&val, optval, sizeof(val)))
1da177e4
LT		 3074 return -EFAULT;
3075
3076 pkt_sk(sk)->copy_thresh = val;
3077 return 0;
3078 }
bbd6ef87
PM		 3079 case PACKET_VERSION:
3080 {
3081 int val;
3082
3083 if (optlen != sizeof(val))
3084 return -EINVAL;
69e3c75f 3085 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
bbd6ef87
PM		 3086 return -EBUSY;
3087 if (copy_from_user(&val, optval, sizeof(val)))
3088 return -EFAULT;
3089 switch (val) {
3090 case TPACKET_V1:
3091 case TPACKET_V2:
f6fb8f10 3092 case TPACKET_V3:
bbd6ef87
PM		 3093 po->tp_version = val;
3094 return 0;
3095 default:
3096 return -EINVAL;
3097 }
3098 }
8913336a
PM		 3099 case PACKET_RESERVE:
3100 {
3101 unsigned int val;
3102
3103 if (optlen != sizeof(val))
3104 return -EINVAL;
69e3c75f 3105 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
8913336a
PM		 3106 return -EBUSY;
3107 if (copy_from_user(&val, optval, sizeof(val)))
3108 return -EFAULT;
3109 po->tp_reserve = val;
3110 return 0;
3111 }
69e3c75f
JB		 3112 case PACKET_LOSS:
3113 {
3114 unsigned int val;
3115
3116 if (optlen != sizeof(val))
3117 return -EINVAL;
3118 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3119 return -EBUSY;
3120 if (copy_from_user(&val, optval, sizeof(val)))
3121 return -EFAULT;
3122 po->tp_loss = !!val;
3123 return 0;
3124 }
8dc41944
HX		 3125 case PACKET_AUXDATA:
3126 {
3127 int val;
3128
3129 if (optlen < sizeof(val))
3130 return -EINVAL;
3131 if (copy_from_user(&val, optval, sizeof(val)))
3132 return -EFAULT;
3133
3134 po->auxdata = !!val;
3135 return 0;
3136 }
80feaacb
PWJ		 3137 case PACKET_ORIGDEV:
3138 {
3139 int val;
3140
3141 if (optlen < sizeof(val))
3142 return -EINVAL;
3143 if (copy_from_user(&val, optval, sizeof(val)))
3144 return -EFAULT;
3145
3146 po->origdev = !!val;
3147 return 0;
3148 }
bfd5f4a3
SS		 3149 case PACKET_VNET_HDR:
3150 {
3151 int val;
3152
3153 if (sock->type != SOCK_RAW)
3154 return -EINVAL;
3155 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3156 return -EBUSY;
3157 if (optlen < sizeof(val))
3158 return -EINVAL;
3159 if (copy_from_user(&val, optval, sizeof(val)))
3160 return -EFAULT;
3161
3162 po->has_vnet_hdr = !!val;
3163 return 0;
3164 }
614f60fa
SM		 3165 case PACKET_TIMESTAMP:
3166 {
3167 int val;
3168
3169 if (optlen != sizeof(val))
3170 return -EINVAL;
3171 if (copy_from_user(&val, optval, sizeof(val)))
3172 return -EFAULT;
3173
3174 po->tp_tstamp = val;
3175 return 0;
3176 }
dc99f600
DM		 3177 case PACKET_FANOUT:
3178 {
3179 int val;
3180
3181 if (optlen != sizeof(val))
3182 return -EINVAL;
3183 if (copy_from_user(&val, optval, sizeof(val)))
3184 return -EFAULT;
3185
3186 return fanout_add(sk, val & 0xffff, val >> 16);
3187 }
1da177e4
LT		 3188 default:
3189 return -ENOPROTOOPT;
3190 }
3191}
3192
3193static int packet_getsockopt(struct socket *sock, int level, int optname,
3194 char __user *optval, int __user *optlen)
3195{
3196 int len;
8dc41944 3197 int val;
1da177e4
LT		 3198 struct sock *sk = sock->sk;
3199 struct packet_sock *po = pkt_sk(sk);
8dc41944
HX		 3200 void *data;
3201 struct tpacket_stats st;
f6fb8f10 3202 union tpacket_stats_u st_u;
1da177e4
LT		 3203
3204 if (level != SOL_PACKET)
3205 return -ENOPROTOOPT;
3206
8ae55f04
KK		 3207 if (get_user(len, optlen))
3208 return -EFAULT;
1da177e4
LT		 3209
3210 if (len < 0)
3211 return -EINVAL;
1ce4f28b 3212
69e3c75f 3213 switch (optname) {
1da177e4 3214 case PACKET_STATISTICS:
f6fb8f10 3215 if (po->tp_version == TPACKET_V3) {
3216 len = sizeof(struct tpacket_stats_v3);
3217 } else {
3218 if (len > sizeof(struct tpacket_stats))
3219 len = sizeof(struct tpacket_stats);
3220 }
1da177e4 3221 spin_lock_bh(&sk->sk_receive_queue.lock);
f6fb8f10 3222 if (po->tp_version == TPACKET_V3) {
3223 memcpy(&st_u.stats3, &po->stats,
3224 sizeof(struct tpacket_stats));
3225 st_u.stats3.tp_freeze_q_cnt =
3226 po->stats_u.stats3.tp_freeze_q_cnt;
3227 st_u.stats3.tp_packets += po->stats.tp_drops;
3228 data = &st_u.stats3;
3229 } else {
3230 st = po->stats;
3231 st.tp_packets += st.tp_drops;
3232 data = &st;
3233 }
1da177e4
LT		 3234 memset(&po->stats, 0, sizeof(st));
3235 spin_unlock_bh(&sk->sk_receive_queue.lock);
8dc41944
HX		 3236 break;
3237 case PACKET_AUXDATA:
3238 if (len > sizeof(int))
3239 len = sizeof(int);
3240 val = po->auxdata;
3241
80feaacb
PWJ		 3242 data = &val;
3243 break;
3244 case PACKET_ORIGDEV:
3245 if (len > sizeof(int))
3246 len = sizeof(int);
3247 val = po->origdev;
3248
bfd5f4a3
SS		 3249 data = &val;
3250 break;
3251 case PACKET_VNET_HDR:
3252 if (len > sizeof(int))
3253 len = sizeof(int);
3254 val = po->has_vnet_hdr;
3255
8dc41944 3256 data = &val;
1da177e4 3257 break;
bbd6ef87
PM		 3258 case PACKET_VERSION:
3259 if (len > sizeof(int))
3260 len = sizeof(int);
3261 val = po->tp_version;
3262 data = &val;
3263 break;
3264 case PACKET_HDRLEN:
3265 if (len > sizeof(int))
3266 len = sizeof(int);
3267 if (copy_from_user(&val, optval, len))
3268 return -EFAULT;
3269 switch (val) {
3270 case TPACKET_V1:
3271 val = sizeof(struct tpacket_hdr);
3272 break;
3273 case TPACKET_V2:
3274 val = sizeof(struct tpacket2_hdr);
3275 break;
f6fb8f10 3276 case TPACKET_V3:
3277 val = sizeof(struct tpacket3_hdr);
3278 break;
bbd6ef87
PM		 3279 default:
3280 return -EINVAL;
3281 }
3282 data = &val;
3283 break;
8913336a
PM		 3284 case PACKET_RESERVE:
3285 if (len > sizeof(unsigned int))
3286 len = sizeof(unsigned int);
3287 val = po->tp_reserve;
3288 data = &val;
3289 break;
69e3c75f
JB		 3290 case PACKET_LOSS:
3291 if (len > sizeof(unsigned int))
3292 len = sizeof(unsigned int);
3293 val = po->tp_loss;
3294 data = &val;
3295 break;
614f60fa
SM		 3296 case PACKET_TIMESTAMP:
3297 if (len > sizeof(int))
3298 len = sizeof(int);
3299 val = po->tp_tstamp;
3300 data = &val;
3301 break;
dc99f600
DM		 3302 case PACKET_FANOUT:
3303 if (len > sizeof(int))
3304 len = sizeof(int);
3305 val = (po->fanout ?
3306 ((u32)po->fanout->id |
3307 ((u32)po->fanout->type << 16)) :
3308 0);
3309 data = &val;
3310 break;
1da177e4
LT		 3311 default:
3312 return -ENOPROTOOPT;
3313 }
3314
8ae55f04
KK		 3315 if (put_user(len, optlen))
3316 return -EFAULT;
8dc41944
HX		 3317 if (copy_to_user(optval, data, len))
3318 return -EFAULT;
8ae55f04 3319 return 0;
1da177e4
LT		 3320}
3321
3322
3323static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
3324{
3325 struct sock *sk;
3326 struct hlist_node *node;
ad930650 3327 struct net_device *dev = data;
c346dca1 3328 struct net *net = dev_net(dev);
1da177e4 3329
808f5114 3330 rcu_read_lock();
3331 sk_for_each_rcu(sk, node, &net->packet.sklist) {
1da177e4
LT		 3332 struct packet_sock *po = pkt_sk(sk);
3333
3334 switch (msg) {
3335 case NETDEV_UNREGISTER:
1da177e4
LT		 3336 if (po->mclist)
3337 packet_dev_mclist(dev, po->mclist, -1);
a2efcfa0
DM		 3338 /* fallthrough */
3339
1da177e4
LT		 3340 case NETDEV_DOWN:
3341 if (dev->ifindex == po->ifindex) {
3342 spin_lock(&po->bind_lock);
3343 if (po->running) {
ce06b03e 3344 __unregister_prot_hook(sk, false);
1da177e4
LT		 3345 sk->sk_err = ENETDOWN;
3346 if (!sock_flag(sk, SOCK_DEAD))
3347 sk->sk_error_report(sk);
3348 }
3349 if (msg == NETDEV_UNREGISTER) {
3350 po->ifindex = -1;
160ff18a
BG		 3351 if (po->prot_hook.dev)
3352 dev_put(po->prot_hook.dev);
1da177e4
LT		 3353 po->prot_hook.dev = NULL;
3354 }
3355 spin_unlock(&po->bind_lock);
3356 }
3357 break;
3358 case NETDEV_UP:
808f5114 3359 if (dev->ifindex == po->ifindex) {
3360 spin_lock(&po->bind_lock);
ce06b03e
DM		 3361 if (po->num)
3362 register_prot_hook(sk);
808f5114 3363 spin_unlock(&po->bind_lock);
1da177e4 3364 }
1da177e4
LT		 3365 break;
3366 }
3367 }
808f5114 3368 rcu_read_unlock();
1da177e4
LT		 3369 return NOTIFY_DONE;
3370}
3371
3372
3373static int packet_ioctl(struct socket *sock, unsigned int cmd,
3374 unsigned long arg)
3375{
3376 struct sock *sk = sock->sk;
3377
69e3c75f 3378 switch (cmd) {
40d4e3df
ED		 3379 case SIOCOUTQ:
3380 {
3381 int amount = sk_wmem_alloc_get(sk);
31e6d363 3382
40d4e3df
ED		 3383 return put_user(amount, (int __user *)arg);
3384 }
3385 case SIOCINQ:
3386 {
3387 struct sk_buff *skb;
3388 int amount = 0;
3389
3390 spin_lock_bh(&sk->sk_receive_queue.lock);
3391 skb = skb_peek(&sk->sk_receive_queue);
3392 if (skb)
3393 amount = skb->len;
3394 spin_unlock_bh(&sk->sk_receive_queue.lock);
3395 return put_user(amount, (int __user *)arg);
3396 }
3397 case SIOCGSTAMP:
3398 return sock_get_timestamp(sk, (struct timeval __user *)arg);
3399 case SIOCGSTAMPNS:
3400 return sock_get_timestampns(sk, (struct timespec __user *)arg);
1ce4f28b 3401
1da177e4 3402#ifdef CONFIG_INET
40d4e3df
ED		 3403 case SIOCADDRT:
3404 case SIOCDELRT:
3405 case SIOCDARP:
3406 case SIOCGARP:
3407 case SIOCSARP:
3408 case SIOCGIFADDR:
3409 case SIOCSIFADDR:
3410 case SIOCGIFBRDADDR:
3411 case SIOCSIFBRDADDR:
3412 case SIOCGIFNETMASK:
3413 case SIOCSIFNETMASK:
3414 case SIOCGIFDSTADDR:
3415 case SIOCSIFDSTADDR:
3416 case SIOCSIFFLAGS:
40d4e3df 3417 return inet_dgram_ops.ioctl(sock, cmd, arg);
1da177e4
LT		 3418#endif
3419
40d4e3df
ED		 3420 default:
3421 return -ENOIOCTLCMD;
1da177e4
LT		 3422 }
3423 return 0;
3424}
3425
40d4e3df 3426static unsigned int packet_poll(struct file *file, struct socket *sock,
1da177e4
LT		 3427 poll_table *wait)
3428{
3429 struct sock *sk = sock->sk;
3430 struct packet_sock *po = pkt_sk(sk);
3431 unsigned int mask = datagram_poll(file, sock, wait);
3432
3433 spin_lock_bh(&sk->sk_receive_queue.lock);
69e3c75f 3434 if (po->rx_ring.pg_vec) {
f6fb8f10 3435 if (!packet_previous_rx_frame(po, &po->rx_ring,
3436 TP_STATUS_KERNEL))
1da177e4
LT		 3437 mask |= POLLIN | POLLRDNORM;
3438 }
3439 spin_unlock_bh(&sk->sk_receive_queue.lock);
69e3c75f
JB		 3440 spin_lock_bh(&sk->sk_write_queue.lock);
3441 if (po->tx_ring.pg_vec) {
3442 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
3443 mask |= POLLOUT | POLLWRNORM;
3444 }
3445 spin_unlock_bh(&sk->sk_write_queue.lock);
1da177e4
LT		 3446 return mask;
3447}
3448
3449
3450/* Dirty? Well, I still did not learn better way to account
3451 * for user mmaps.
3452 */
3453
3454static void packet_mm_open(struct vm_area_struct *vma)
3455{
3456 struct file *file = vma->vm_file;
40d4e3df 3457 struct socket *sock = file->private_data;
1da177e4 3458 struct sock *sk = sock->sk;
1ce4f28b 3459
1da177e4
LT		 3460 if (sk)
3461 atomic_inc(&pkt_sk(sk)->mapped);
3462}
3463
3464static void packet_mm_close(struct vm_area_struct *vma)
3465{
3466 struct file *file = vma->vm_file;
40d4e3df 3467 struct socket *sock = file->private_data;
1da177e4 3468 struct sock *sk = sock->sk;
1ce4f28b 3469
1da177e4
LT		 3470 if (sk)
3471 atomic_dec(&pkt_sk(sk)->mapped);
3472}
3473
f0f37e2f 3474static const struct vm_operations_struct packet_mmap_ops = {
40d4e3df
ED		 3475 .open = packet_mm_open,
3476 .close = packet_mm_close,
1da177e4
LT		 3477};
3478
0e3125c7
NH		 3479static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
3480 unsigned int len)
1da177e4
LT		 3481{
3482 int i;
3483
4ebf0ae2 3484 for (i = 0; i < len; i++) {
0e3125c7 3485 if (likely(pg_vec[i].buffer)) {
c56b4d90 3486 if (is_vmalloc_addr(pg_vec[i].buffer))
0e3125c7
NH		 3487 vfree(pg_vec[i].buffer);
3488 else
3489 free_pages((unsigned long)pg_vec[i].buffer,
3490 order);
3491 pg_vec[i].buffer = NULL;
3492 }
1da177e4
LT		 3493 }
3494 kfree(pg_vec);
3495}
3496
eea49cc9 3497static char *alloc_one_pg_vec_page(unsigned long order)
4ebf0ae2 3498{
0e3125c7
NH		 3499 char *buffer = NULL;
3500 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
3501 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
3502
3503 buffer = (char *) __get_free_pages(gfp_flags, order);
3504
3505 if (buffer)
3506 return buffer;
3507
3508 /*
3509 * __get_free_pages failed, fall back to vmalloc
3510 */
bbce5a59 3511 buffer = vzalloc((1 << order) * PAGE_SIZE);
719bfeaa 3512
0e3125c7
NH		 3513 if (buffer)
3514 return buffer;
3515
3516 /*
3517 * vmalloc failed, lets dig into swap here
3518 */
0e3125c7
NH		 3519 gfp_flags &= ~__GFP_NORETRY;
3520 buffer = (char *)__get_free_pages(gfp_flags, order);
3521 if (buffer)
3522 return buffer;
3523
3524 /*
3525 * complete and utter failure
3526 */
3527 return NULL;
4ebf0ae2
DM		 3528}
3529
0e3125c7 3530static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
4ebf0ae2
DM		 3531{
3532 unsigned int block_nr = req->tp_block_nr;
0e3125c7 3533 struct pgv *pg_vec;
4ebf0ae2
DM		 3534 int i;
3535
0e3125c7 3536 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
4ebf0ae2
DM		 3537 if (unlikely(!pg_vec))
3538 goto out;
3539
3540 for (i = 0; i < block_nr; i++) {
c56b4d90 3541 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
0e3125c7 3542 if (unlikely(!pg_vec[i].buffer))
4ebf0ae2
DM		 3543 goto out_free_pgvec;
3544 }
3545
3546out:
3547 return pg_vec;
3548
3549out_free_pgvec:
3550 free_pg_vec(pg_vec, order, block_nr);
3551 pg_vec = NULL;
3552 goto out;
3553}
1da177e4 3554
f6fb8f10 3555static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
69e3c75f 3556 int closing, int tx_ring)
1da177e4 3557{
0e3125c7 3558 struct pgv *pg_vec = NULL;
1da177e4 3559 struct packet_sock *po = pkt_sk(sk);
0e11c91e 3560 int was_running, order = 0;
69e3c75f
JB		 3561 struct packet_ring_buffer *rb;
3562 struct sk_buff_head *rb_queue;
0e11c91e 3563 __be16 num;
f6fb8f10 3564 int err = -EINVAL;
3565 /* Added to avoid minimal code churn */
3566 struct tpacket_req *req = &req_u->req;
3567
3568 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
3569 if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) {
3570 WARN(1, "Tx-ring is not supported.\n");
3571 goto out;
3572 }
1ce4f28b 3573
69e3c75f
JB		 3574 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
3575 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
1da177e4 3576
69e3c75f
JB		 3577 err = -EBUSY;
3578 if (!closing) {
3579 if (atomic_read(&po->mapped))
3580 goto out;
3581 if (atomic_read(&rb->pending))
3582 goto out;
3583 }
1da177e4 3584
69e3c75f
JB		 3585 if (req->tp_block_nr) {
3586 /* Sanity tests and some calculations */
3587 err = -EBUSY;
3588 if (unlikely(rb->pg_vec))
3589 goto out;
1da177e4 3590
bbd6ef87
PM		 3591 switch (po->tp_version) {
3592 case TPACKET_V1:
3593 po->tp_hdrlen = TPACKET_HDRLEN;
3594 break;
3595 case TPACKET_V2:
3596 po->tp_hdrlen = TPACKET2_HDRLEN;
3597 break;
f6fb8f10 3598 case TPACKET_V3:
3599 po->tp_hdrlen = TPACKET3_HDRLEN;
3600 break;
bbd6ef87
PM		 3601 }
3602
69e3c75f 3603 err = -EINVAL;
4ebf0ae2 3604 if (unlikely((int)req->tp_block_size <= 0))
69e3c75f 3605 goto out;
4ebf0ae2 3606 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
69e3c75f 3607 goto out;
8913336a 3608 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
69e3c75f
JB		 3609 po->tp_reserve))
3610 goto out;
4ebf0ae2 3611 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
69e3c75f 3612 goto out;
1da177e4 3613
69e3c75f
JB		 3614 rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
3615 if (unlikely(rb->frames_per_block <= 0))
3616 goto out;
3617 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
3618 req->tp_frame_nr))
3619 goto out;
1da177e4
LT		 3620
3621 err = -ENOMEM;
4ebf0ae2
DM		 3622 order = get_order(req->tp_block_size);
3623 pg_vec = alloc_pg_vec(req, order);
3624 if (unlikely(!pg_vec))
1da177e4 3625 goto out;
f6fb8f10 3626 switch (po->tp_version) {
3627 case TPACKET_V3:
3628 /* Transmit path is not supported. We checked
3629 * it above but just being paranoid
3630 */
3631 if (!tx_ring)
3632 init_prb_bdqc(po, rb, pg_vec, req_u, tx_ring);
3633 break;
3634 default:
3635 break;
3636 }
69e3c75f
JB		 3637 }
3638 /* Done */
3639 else {
3640 err = -EINVAL;
4ebf0ae2 3641 if (unlikely(req->tp_frame_nr))
69e3c75f 3642 goto out;
1da177e4
LT		 3643 }
3644
3645 lock_sock(sk);
3646
3647 /* Detach socket from network */
3648 spin_lock(&po->bind_lock);
3649 was_running = po->running;
3650 num = po->num;
3651 if (was_running) {
1da177e4 3652 po->num = 0;
ce06b03e 3653 __unregister_prot_hook(sk, false);
1da177e4
LT		 3654 }
3655 spin_unlock(&po->bind_lock);
1ce4f28b 3656
1da177e4
LT		 3657 synchronize_net();
3658
3659 err = -EBUSY;
905db440 3660 mutex_lock(&po->pg_vec_lock);
1da177e4
LT		 3661 if (closing || atomic_read(&po->mapped) == 0) {
3662 err = 0;
69e3c75f 3663 spin_lock_bh(&rb_queue->lock);
c053fd96 3664 swap(rb->pg_vec, pg_vec);
69e3c75f
JB		 3665 rb->frame_max = (req->tp_frame_nr - 1);
3666 rb->head = 0;
3667 rb->frame_size = req->tp_frame_size;
3668 spin_unlock_bh(&rb_queue->lock);
3669
c053fd96
CG		 3670 swap(rb->pg_vec_order, order);
3671 swap(rb->pg_vec_len, req->tp_block_nr);
69e3c75f
JB		 3672
3673 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
3674 po->prot_hook.func = (po->rx_ring.pg_vec) ?
3675 tpacket_rcv : packet_rcv;
3676 skb_queue_purge(rb_queue);
1da177e4 3677 if (atomic_read(&po->mapped))
40d4e3df
ED		 3678 pr_err("packet_mmap: vma is busy: %d\n",
3679 atomic_read(&po->mapped));
1da177e4 3680 }
905db440 3681 mutex_unlock(&po->pg_vec_lock);
1da177e4
LT		 3682
3683 spin_lock(&po->bind_lock);
ce06b03e 3684 if (was_running) {
1da177e4 3685 po->num = num;
ce06b03e 3686 register_prot_hook(sk);
1da177e4
LT		 3687 }
3688 spin_unlock(&po->bind_lock);
f6fb8f10 3689 if (closing && (po->tp_version > TPACKET_V2)) {
3690 /* Because we don't support block-based V3 on tx-ring */
3691 if (!tx_ring)
3692 prb_shutdown_retire_blk_timer(po, tx_ring, rb_queue);
3693 }
1da177e4
LT		 3694 release_sock(sk);
3695
1da177e4
LT		 3696 if (pg_vec)
3697 free_pg_vec(pg_vec, order, req->tp_block_nr);
3698out:
3699 return err;
3700}
3701
69e3c75f
JB		 3702static int packet_mmap(struct file *file, struct socket *sock,
3703 struct vm_area_struct *vma)
1da177e4
LT		 3704{
3705 struct sock *sk = sock->sk;
3706 struct packet_sock *po = pkt_sk(sk);
69e3c75f
JB		 3707 unsigned long size, expected_size;
3708 struct packet_ring_buffer *rb;
1da177e4
LT		 3709 unsigned long start;
3710 int err = -EINVAL;
3711 int i;
3712
3713 if (vma->vm_pgoff)
3714 return -EINVAL;
3715
905db440 3716 mutex_lock(&po->pg_vec_lock);
69e3c75f
JB		 3717
3718 expected_size = 0;
3719 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
3720 if (rb->pg_vec) {
3721 expected_size += rb->pg_vec_len
3722 * rb->pg_vec_pages
3723 * PAGE_SIZE;
3724 }
3725 }
3726
3727 if (expected_size == 0)
1da177e4 3728 goto out;
69e3c75f
JB		 3729
3730 size = vma->vm_end - vma->vm_start;
3731 if (size != expected_size)
1da177e4
LT		 3732 goto out;
3733
1da177e4 3734 start = vma->vm_start;
69e3c75f
JB		 3735 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
3736 if (rb->pg_vec == NULL)
3737 continue;
3738
3739 for (i = 0; i < rb->pg_vec_len; i++) {
0e3125c7
NH		 3740 struct page *page;
3741 void *kaddr = rb->pg_vec[i].buffer;
69e3c75f
JB		 3742 int pg_num;
3743
c56b4d90
CG		 3744 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
3745 page = pgv_to_page(kaddr);
69e3c75f
JB		 3746 err = vm_insert_page(vma, start, page);
3747 if (unlikely(err))
3748 goto out;
3749 start += PAGE_SIZE;
0e3125c7 3750 kaddr += PAGE_SIZE;
69e3c75f 3751 }
4ebf0ae2 3752 }
1da177e4 3753 }
69e3c75f 3754
4ebf0ae2 3755 atomic_inc(&po->mapped);
1da177e4
LT		 3756 vma->vm_ops = &packet_mmap_ops;
3757 err = 0;
3758
3759out:
905db440 3760 mutex_unlock(&po->pg_vec_lock);
1da177e4
LT		 3761 return err;
3762}
1da177e4 3763
90ddc4f0 3764static const struct proto_ops packet_ops_spkt = {
1da177e4
LT		 3765 .family = PF_PACKET,
3766 .owner = THIS_MODULE,
3767 .release = packet_release,
3768 .bind = packet_bind_spkt,
3769 .connect = sock_no_connect,
3770 .socketpair = sock_no_socketpair,
3771 .accept = sock_no_accept,
3772 .getname = packet_getname_spkt,
3773 .poll = datagram_poll,
3774 .ioctl = packet_ioctl,
3775 .listen = sock_no_listen,
3776 .shutdown = sock_no_shutdown,
3777 .setsockopt = sock_no_setsockopt,
3778 .getsockopt = sock_no_getsockopt,
3779 .sendmsg = packet_sendmsg_spkt,
3780 .recvmsg = packet_recvmsg,
3781 .mmap = sock_no_mmap,
3782 .sendpage = sock_no_sendpage,
3783};
1da177e4 3784
90ddc4f0 3785static const struct proto_ops packet_ops = {
1da177e4
LT		 3786 .family = PF_PACKET,
3787 .owner = THIS_MODULE,
3788 .release = packet_release,
3789 .bind = packet_bind,
3790 .connect = sock_no_connect,
3791 .socketpair = sock_no_socketpair,
3792 .accept = sock_no_accept,
1ce4f28b 3793 .getname = packet_getname,
1da177e4
LT		 3794 .poll = packet_poll,
3795 .ioctl = packet_ioctl,
3796 .listen = sock_no_listen,
3797 .shutdown = sock_no_shutdown,
3798 .setsockopt = packet_setsockopt,
3799 .getsockopt = packet_getsockopt,
3800 .sendmsg = packet_sendmsg,
3801 .recvmsg = packet_recvmsg,
3802 .mmap = packet_mmap,
3803 .sendpage = sock_no_sendpage,
3804};
3805
ec1b4cf7 3806static const struct net_proto_family packet_family_ops = {
1da177e4
LT		 3807 .family = PF_PACKET,
3808 .create = packet_create,
3809 .owner = THIS_MODULE,
3810};
3811
3812static struct notifier_block packet_netdev_notifier = {
40d4e3df 3813 .notifier_call = packet_notifier,
1da177e4
LT		 3814};
3815
3816#ifdef CONFIG_PROC_FS
1da177e4
LT		 3817
3818static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
808f5114 3819 __acquires(RCU)
1da177e4 3820{
e372c414 3821 struct net *net = seq_file_net(seq);
808f5114 3822
3823 rcu_read_lock();
3824 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
1da177e4
LT		 3825}
3826
3827static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3828{
1bf40954 3829 struct net *net = seq_file_net(seq);
808f5114 3830 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
1da177e4
LT		 3831}
3832
3833static void packet_seq_stop(struct seq_file *seq, void *v)
808f5114 3834 __releases(RCU)
1da177e4 3835{
808f5114 3836 rcu_read_unlock();
1da177e4
LT		 3837}
3838
1ce4f28b 3839static int packet_seq_show(struct seq_file *seq, void *v)
1da177e4
LT		 3840{
3841 if (v == SEQ_START_TOKEN)
3842 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
3843 else {
b7ceabd9 3844 struct sock *s = sk_entry(v);
1da177e4
LT		 3845 const struct packet_sock *po = pkt_sk(s);
3846
3847 seq_printf(seq,
71338aa7 3848 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
1da177e4
LT		 3849 s,
3850 atomic_read(&s->sk_refcnt),
3851 s->sk_type,
3852 ntohs(po->num),
3853 po->ifindex,
3854 po->running,
3855 atomic_read(&s->sk_rmem_alloc),
3856 sock_i_uid(s),
40d4e3df 3857 sock_i_ino(s));
1da177e4
LT		 3858 }
3859
3860 return 0;
3861}
3862
56b3d975 3863static const struct seq_operations packet_seq_ops = {
1da177e4
LT		 3864 .start = packet_seq_start,
3865 .next = packet_seq_next,
3866 .stop = packet_seq_stop,
3867 .show = packet_seq_show,
3868};
3869
3870static int packet_seq_open(struct inode *inode, struct file *file)
3871{
e372c414
DL		 3872 return seq_open_net(inode, file, &packet_seq_ops,
3873 sizeof(struct seq_net_private));
1da177e4
LT		 3874}
3875
da7071d7 3876static const struct file_operations packet_seq_fops = {
1da177e4
LT		 3877 .owner = THIS_MODULE,
3878 .open = packet_seq_open,
3879 .read = seq_read,
3880 .llseek = seq_lseek,
e372c414 3881 .release = seq_release_net,
1da177e4
LT		 3882};
3883
3884#endif
3885
2c8c1e72 3886static int __net_init packet_net_init(struct net *net)
d12d01d6 3887{
808f5114 3888 spin_lock_init(&net->packet.sklist_lock);
2aaef4e4 3889 INIT_HLIST_HEAD(&net->packet.sklist);
d12d01d6
DL		 3890
3891 if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
3892 return -ENOMEM;
3893
3894 return 0;
3895}
3896
2c8c1e72 3897static void __net_exit packet_net_exit(struct net *net)
d12d01d6
DL		 3898{
3899 proc_net_remove(net, "packet");
3900}
3901
3902static struct pernet_operations packet_net_ops = {
3903 .init = packet_net_init,
3904 .exit = packet_net_exit,
3905};
3906
3907
1da177e4
LT		 3908static void __exit packet_exit(void)
3909{
1da177e4 3910 unregister_netdevice_notifier(&packet_netdev_notifier);
d12d01d6 3911 unregister_pernet_subsys(&packet_net_ops);
1da177e4
LT		 3912 sock_unregister(PF_PACKET);
3913 proto_unregister(&packet_proto);
3914}
3915
3916static int __init packet_init(void)
3917{
3918 int rc = proto_register(&packet_proto, 0);
3919
3920 if (rc != 0)
3921 goto out;
3922
3923 sock_register(&packet_family_ops);
d12d01d6 3924 register_pernet_subsys(&packet_net_ops);
1da177e4 3925 register_netdevice_notifier(&packet_netdev_notifier);
1da177e4
LT		 3926out:
3927 return rc;
3928}
3929
3930module_init(packet_init);
3931module_exit(packet_exit);
3932MODULE_LICENSE("GPL");
3933MODULE_ALIAS_NETPROTO(PF_PACKET);
kernel source for telekom puls (alcatel/mediatek)