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.
6 * PACKET - implements raw packet sockets.
9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Alan Cox, <gw4pts@gw4pts.ampr.org>
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.
35 * Ulises Alonso : Frame number limit removal and
36 * packet_set_ring memory leak.
37 * Eric Biederman : Allow for > 8 byte hardware addresses.
38 * The convention is that longer addresses
39 * will simply extend the hardware address
40 * byte arrays at the end of sockaddr_ll
42 * Johann Baudy : Added TX RING.
43 * Chetan Loke : Implemented TPACKET_V3 block abstraction
45 * Copyright (C) 2011, <lokec@ccs.neu.edu>
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.
55 #include <linux/types.h>
57 #include <linux/capability.h>
58 #include <linux/fcntl.h>
59 #include <linux/socket.h>
61 #include <linux/inet.h>
62 #include <linux/netdevice.h>
63 #include <linux/if_packet.h>
64 #include <linux/wireless.h>
65 #include <linux/kernel.h>
66 #include <linux/kmod.h>
67 #include <linux/slab.h>
68 #include <linux/vmalloc.h>
69 #include <net/net_namespace.h>
71 #include <net/protocol.h>
72 #include <linux/skbuff.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>
80 #include <asm/cacheflush.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>
87 #include <linux/mutex.h>
88 #include <linux/if_vlan.h>
89 #include <linux/virtio_net.h>
90 #include <linux/errqueue.h>
91 #include <linux/net_tstamp.h>
94 #include <net/inet_common.h>
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
105 - packet socket receives packets with pulled ll header,
106 so that SOCK_RAW should push it back.
111 Incoming, dev->hard_header!=NULL
112 mac_header -> ll header
115 Outgoing, dev->hard_header!=NULL
116 mac_header -> ll header
119 Incoming, dev->hard_header==NULL
120 mac_header -> UNKNOWN position. It is very likely, that it points to ll
121 header. PPP makes it, that is wrong, because introduce
122 assymetry between rx and tx paths.
125 Outgoing, dev->hard_header==NULL
126 mac_header -> data. ll header is still not built!
130 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
136 dev->hard_header != NULL
137 mac_header -> ll header
140 dev->hard_header == NULL (ll header is added by device, we cannot control it)
144 We should set nh.raw on output to correct posistion,
145 packet classifier depends on it.
148 /* Private packet socket structures. */
150 struct packet_mclist {
151 struct packet_mclist *next;
156 unsigned char addr[MAX_ADDR_LEN];
158 /* identical to struct packet_mreq except it has
159 * a longer address field.
161 struct packet_mreq_max {
163 unsigned short mr_type;
164 unsigned short mr_alen;
165 unsigned char mr_address[MAX_ADDR_LEN];
168 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
169 int closing, int tx_ring);
172 #define V3_ALIGNMENT (8)
174 #define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT))
176 #define BLK_PLUS_PRIV(sz_of_priv) \
177 (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT))
179 /* kbdq - kernel block descriptor queue */
180 struct tpacket_kbdq_core {
182 unsigned int feature_req_word;
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;
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.
193 unsigned short last_kactive_blk_num;
198 unsigned int knum_blocks;
199 uint64_t knxt_seq_num;
204 atomic_t blk_fill_in_prog;
206 /* Default is set to 8ms */
207 #define DEFAULT_PRB_RETIRE_TOV (8)
209 unsigned short retire_blk_tov;
210 unsigned short version;
211 unsigned long tov_in_jiffies;
213 /* timer to retire an outstanding block */
214 struct timer_list retire_blk_timer;
217 #define PGV_FROM_VMALLOC 1
222 struct packet_ring_buffer {
225 unsigned int frames_per_block;
226 unsigned int frame_size;
227 unsigned int frame_max;
229 unsigned int pg_vec_order;
230 unsigned int pg_vec_pages;
231 unsigned int pg_vec_len;
233 struct tpacket_kbdq_core prb_bdqc;
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)))
246 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
248 static void *packet_previous_frame(struct packet_sock *po,
249 struct packet_ring_buffer *rb,
251 static void packet_increment_head(struct packet_ring_buffer *buff);
252 static int prb_curr_blk_in_use(struct tpacket_kbdq_core *,
253 struct tpacket_block_desc *);
254 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *,
255 struct packet_sock *);
256 static void prb_retire_current_block(struct tpacket_kbdq_core *,
257 struct packet_sock *, unsigned int status);
258 static int prb_queue_frozen(struct tpacket_kbdq_core *);
259 static void prb_open_block(struct tpacket_kbdq_core *,
260 struct tpacket_block_desc *);
261 static void prb_retire_rx_blk_timer_expired(unsigned long);
262 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *);
263 static void prb_init_blk_timer(struct packet_sock *,
264 struct tpacket_kbdq_core *,
265 void (*func) (unsigned long));
266 static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *);
267 static void prb_clear_rxhash(struct tpacket_kbdq_core *,
268 struct tpacket3_hdr *);
269 static void prb_fill_vlan_info(struct tpacket_kbdq_core *,
270 struct tpacket3_hdr *);
271 static void packet_flush_mclist(struct sock *sk);
273 struct packet_fanout;
275 /* struct sock has to be the first member of packet_sock */
277 struct packet_fanout *fanout;
278 struct tpacket_stats stats;
279 union tpacket_stats_u stats_u;
280 struct packet_ring_buffer rx_ring;
281 struct packet_ring_buffer tx_ring;
283 spinlock_t bind_lock;
284 struct mutex pg_vec_lock;
285 unsigned int running:1, /* prot_hook is attached*/
289 int ifindex; /* bound device */
291 struct packet_mclist *mclist;
293 enum tpacket_versions tp_version;
294 unsigned int tp_hdrlen;
295 unsigned int tp_reserve;
296 unsigned int tp_loss:1;
297 unsigned int tp_tstamp;
298 struct packet_type prot_hook ____cacheline_aligned_in_smp;
301 #define PACKET_FANOUT_MAX 256
303 struct packet_fanout {
307 unsigned int num_members;
312 struct list_head list;
313 struct sock *arr[PACKET_FANOUT_MAX];
316 struct packet_type prot_hook ____cacheline_aligned_in_smp;
319 struct packet_skb_cb {
320 unsigned int origlen;
322 struct sockaddr_pkt pkt;
323 struct sockaddr_ll ll;
327 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
329 #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
330 #define GET_PBLOCK_DESC(x, bid) \
331 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
332 #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
333 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
334 #define GET_NEXT_PRB_BLK_NUM(x) \
335 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
336 ((x)->kactive_blk_num+1) : 0)
338 static inline struct packet_sock *pkt_sk(struct sock *sk)
340 return (struct packet_sock *)sk;
343 static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
344 static void __fanout_link(struct sock *sk, struct packet_sock *po);
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()).
350 static void register_prot_hook(struct sock *sk)
352 struct packet_sock *po = pkt_sk(sk);
355 __fanout_link(sk, po);
357 dev_add_pack(&po->prot_hook);
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.
370 static void __unregister_prot_hook(struct sock *sk, bool sync)
372 struct packet_sock *po = pkt_sk(sk);
376 __fanout_unlink(sk, po);
378 __dev_remove_pack(&po->prot_hook);
382 spin_unlock(&po->bind_lock);
384 spin_lock(&po->bind_lock);
388 static void unregister_prot_hook(struct sock *sk, bool sync)
390 struct packet_sock *po = pkt_sk(sk);
393 __unregister_prot_hook(sk, sync);
396 static inline __pure struct page *pgv_to_page(void *addr)
398 if (is_vmalloc_addr(addr))
399 return vmalloc_to_page(addr);
400 return virt_to_page(addr);
403 static void __packet_set_status(struct packet_sock *po, void *frame, int status)
406 struct tpacket_hdr *h1;
407 struct tpacket2_hdr *h2;
412 switch (po->tp_version) {
414 h.h1->tp_status = status;
415 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
418 h.h2->tp_status = status;
419 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
423 WARN(1, "TPACKET version not supported.\n");
430 static int __packet_get_status(struct packet_sock *po, void *frame)
433 struct tpacket_hdr *h1;
434 struct tpacket2_hdr *h2;
441 switch (po->tp_version) {
443 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
444 return h.h1->tp_status;
446 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
447 return h.h2->tp_status;
450 WARN(1, "TPACKET version not supported.\n");
456 static void *packet_lookup_frame(struct packet_sock *po,
457 struct packet_ring_buffer *rb,
458 unsigned int position,
461 unsigned int pg_vec_pos, frame_offset;
463 struct tpacket_hdr *h1;
464 struct tpacket2_hdr *h2;
468 pg_vec_pos = position / rb->frames_per_block;
469 frame_offset = position % rb->frames_per_block;
471 h.raw = rb->pg_vec[pg_vec_pos].buffer +
472 (frame_offset * rb->frame_size);
474 if (status != __packet_get_status(po, h.raw))
480 static inline void *packet_current_frame(struct packet_sock *po,
481 struct packet_ring_buffer *rb,
484 return packet_lookup_frame(po, rb, rb->head, status);
487 static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc)
489 del_timer_sync(&pkc->retire_blk_timer);
492 static void prb_shutdown_retire_blk_timer(struct packet_sock *po,
494 struct sk_buff_head *rb_queue)
496 struct tpacket_kbdq_core *pkc;
498 pkc = tx_ring ? &po->tx_ring.prb_bdqc : &po->rx_ring.prb_bdqc;
500 spin_lock(&rb_queue->lock);
501 pkc->delete_blk_timer = 1;
502 spin_unlock(&rb_queue->lock);
504 prb_del_retire_blk_timer(pkc);
507 static void prb_init_blk_timer(struct packet_sock *po,
508 struct tpacket_kbdq_core *pkc,
509 void (*func) (unsigned long))
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;
517 static void prb_setup_retire_blk_timer(struct packet_sock *po, int tx_ring)
519 struct tpacket_kbdq_core *pkc;
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);
528 static int prb_calc_retire_blk_tmo(struct packet_sock *po,
529 int blk_size_in_bytes)
531 struct net_device *dev;
532 unsigned int mbits = 0, msec = 0, div = 0, tmo = 0;
533 struct ethtool_cmd ecmd;
537 dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex);
538 if (unlikely(!dev)) {
540 return DEFAULT_PRB_RETIRE_TOV;
542 err = __ethtool_get_settings(dev, &ecmd);
545 switch (ecmd.speed) {
555 * If the link speed is so slow you don't really
556 * need to worry about perf anyways
561 return DEFAULT_PRB_RETIRE_TOV;
565 mbits = (blk_size_in_bytes * 8) / (1024 * 1024);
577 static void prb_init_ft_ops(struct tpacket_kbdq_core *p1,
578 union tpacket_req_u *req_u)
580 p1->feature_req_word = req_u->req3.tp_feature_req_word;
583 static void init_prb_bdqc(struct packet_sock *po,
584 struct packet_ring_buffer *rb,
586 union tpacket_req_u *req_u, int tx_ring)
588 struct tpacket_kbdq_core *p1 = &rb->prb_bdqc;
589 struct tpacket_block_desc *pbd;
591 memset(p1, 0x0, sizeof(*p1));
593 p1->knxt_seq_num = 1;
595 pbd = (struct tpacket_block_desc *)pg_vec[0].buffer;
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;
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;
611 prb_init_ft_ops(p1, req_u);
612 prb_setup_retire_blk_timer(po, tx_ring);
613 prb_open_block(p1, pbd);
616 /* Do NOT update the last_blk_num first.
617 * Assumes sk_buff_head lock is held.
619 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc)
621 mod_timer(&pkc->retire_blk_timer,
622 jiffies + pkc->tov_in_jiffies);
623 pkc->last_kactive_blk_num = pkc->kactive_blk_num;
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.
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.
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.
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.
649 static void prb_retire_rx_blk_timer_expired(unsigned long data)
651 struct packet_sock *po = (struct packet_sock *)data;
652 struct tpacket_kbdq_core *pkc = &po->rx_ring.prb_bdqc;
654 struct tpacket_block_desc *pbd;
656 spin_lock(&po->sk.sk_receive_queue.lock);
658 frozen = prb_queue_frozen(pkc);
659 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
661 if (unlikely(pkc->delete_blk_timer))
664 /* We only need to plug the race when the block is partially filled.
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
673 if (BLOCK_NUM_PKTS(pbd)) {
674 while (atomic_read(&pkc->blk_fill_in_prog)) {
675 /* Waiting for skb_copy_bits to finish... */
680 if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) {
682 prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO);
683 if (!prb_dispatch_next_block(pkc, po))
688 /* Case 1. Queue was frozen because user-space was
691 if (prb_curr_blk_in_use(pkc, pbd)) {
693 * Ok, user-space is still behind.
694 * So just refresh the timer.
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.
705 prb_open_block(pkc, pbd);
712 _prb_refresh_rx_retire_blk_timer(pkc);
715 spin_unlock(&po->sk.sk_receive_queue.lock);
718 static inline void prb_flush_block(struct tpacket_kbdq_core *pkc1,
719 struct tpacket_block_desc *pbd1, __u32 status)
721 /* Flush everything minus the block header */
723 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
728 /* Skip the block header(we know header WILL fit in 4K) */
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));
738 /* Now update the block status. */
740 BLOCK_STATUS(pbd1) = status;
742 /* Flush the block header */
744 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
746 flush_dcache_page(pgv_to_page(start));
756 * 2) Increment active_blk_num
758 * Note:We DONT refresh the timer on purpose.
759 * Because almost always the next block will be opened.
761 static void prb_close_block(struct tpacket_kbdq_core *pkc1,
762 struct tpacket_block_desc *pbd1,
763 struct packet_sock *po, unsigned int stat)
765 __u32 status = TP_STATUS_USER | stat;
767 struct tpacket3_hdr *last_pkt;
768 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
770 if (po->stats.tp_drops)
771 status |= TP_STATUS_LOSING;
773 last_pkt = (struct tpacket3_hdr *)pkc1->prev;
774 last_pkt->tp_next_offset = 0;
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;
781 /* Ok, we tmo'd - so get the current time */
784 h1->ts_last_pkt.ts_sec = ts.tv_sec;
785 h1->ts_last_pkt.ts_nsec = ts.tv_nsec;
790 /* Flush the block */
791 prb_flush_block(pkc1, pbd1, status);
793 pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1);
796 static inline void prb_thaw_queue(struct tpacket_kbdq_core *pkc)
798 pkc->reset_pending_on_curr_blk = 0;
802 * Side effect of opening a block:
804 * 1) prb_queue is thawed.
805 * 2) retire_blk_timer is refreshed.
808 static void prb_open_block(struct tpacket_kbdq_core *pkc1,
809 struct tpacket_block_desc *pbd1)
812 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
816 if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd1))) {
818 /* We could have just memset this but we will lose the
819 * flexibility of making the priv area sticky
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);
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);
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);
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'.
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.
872 static inline void prb_freeze_queue(struct tpacket_kbdq_core *pkc,
873 struct packet_sock *po)
875 pkc->reset_pending_on_curr_blk = 1;
876 po->stats_u.stats3.tp_freeze_q_cnt++;
879 #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
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.
887 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc,
888 struct packet_sock *po)
890 struct tpacket_block_desc *pbd;
894 /* 1. Get current block num */
895 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
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);
905 * open this block and return the offset where the first packet
906 * needs to get stored.
908 prb_open_block(pkc, pbd);
909 return (void *)pkc->nxt_offset;
912 static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
913 struct packet_sock *po, unsigned int status)
915 struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
917 /* retire/close the current block */
918 if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) {
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()
925 * We don't need to worry about the TMO case because
926 * the timer-handler already handled this case.
928 if (!(status & TP_STATUS_BLK_TMO)) {
929 while (atomic_read(&pkc->blk_fill_in_prog)) {
930 /* Waiting for skb_copy_bits to finish... */
934 prb_close_block(pkc, pbd, po, status);
938 WARN(1, "ERROR-pbd[%d]:%p\n", pkc->kactive_blk_num, pbd);
943 static inline int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc,
944 struct tpacket_block_desc *pbd)
946 return TP_STATUS_USER & BLOCK_STATUS(pbd);
949 static inline int prb_queue_frozen(struct tpacket_kbdq_core *pkc)
951 return pkc->reset_pending_on_curr_blk;
954 static inline void prb_clear_blk_fill_status(struct packet_ring_buffer *rb)
956 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
957 atomic_dec(&pkc->blk_fill_in_prog);
960 static inline void prb_fill_rxhash(struct tpacket_kbdq_core *pkc,
961 struct tpacket3_hdr *ppd)
963 ppd->hv1.tp_rxhash = skb_get_rxhash(pkc->skb);
966 static inline void prb_clear_rxhash(struct tpacket_kbdq_core *pkc,
967 struct tpacket3_hdr *ppd)
969 ppd->hv1.tp_rxhash = 0;
972 static inline void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
973 struct tpacket3_hdr *ppd)
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;
979 ppd->hv1.tp_vlan_tci = ppd->tp_status = 0;
983 static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc,
984 struct tpacket3_hdr *ppd)
986 prb_fill_vlan_info(pkc, ppd);
988 if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH)
989 prb_fill_rxhash(pkc, ppd);
991 prb_clear_rxhash(pkc, ppd);
994 static inline void prb_fill_curr_block(char *curr,
995 struct tpacket_kbdq_core *pkc,
996 struct tpacket_block_desc *pbd,
999 struct tpacket3_hdr *ppd;
1001 ppd = (struct tpacket3_hdr *)curr;
1002 ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len);
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);
1011 /* Assumes caller has the sk->rx_queue.lock */
1012 static void *__packet_lookup_frame_in_block(struct packet_sock *po,
1013 struct sk_buff *skb,
1018 struct tpacket_kbdq_core *pkc;
1019 struct tpacket_block_desc *pbd;
1022 pkc = GET_PBDQC_FROM_RB(((struct packet_ring_buffer *)&po->rx_ring));
1023 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1025 /* Queue is frozen when user space is lagging behind */
1026 if (prb_queue_frozen(pkc)) {
1028 * Check if that last block which caused the queue to freeze,
1029 * is still in_use by user-space.
1031 if (prb_curr_blk_in_use(pkc, pbd)) {
1032 /* Can't record this packet */
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.
1041 prb_open_block(pkc, pbd);
1046 curr = pkc->nxt_offset;
1048 end = (char *) ((char *)pbd + pkc->kblk_size);
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;
1056 /* Ok, close the current block */
1057 prb_retire_current_block(pkc, po, 0);
1059 /* Now, try to dispatch the next block */
1060 curr = (char *)prb_dispatch_next_block(pkc, po);
1062 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1063 prb_fill_curr_block(curr, pkc, pbd, len);
1064 return (void *)curr;
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.
1074 static inline void *packet_current_rx_frame(struct packet_sock *po,
1075 struct sk_buff *skb,
1076 int status, unsigned int len)
1079 switch (po->tp_version) {
1082 curr = packet_lookup_frame(po, &po->rx_ring,
1083 po->rx_ring.head, status);
1086 return __packet_lookup_frame_in_block(po, skb, status, len);
1088 WARN(1, "TPACKET version not supported\n");
1094 static inline void *prb_lookup_block(struct packet_sock *po,
1095 struct packet_ring_buffer *rb,
1096 unsigned int previous,
1099 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
1100 struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, previous);
1102 if (status != BLOCK_STATUS(pbd))
1107 static inline int prb_previous_blk_num(struct packet_ring_buffer *rb)
1110 if (rb->prb_bdqc.kactive_blk_num)
1111 prev = rb->prb_bdqc.kactive_blk_num-1;
1113 prev = rb->prb_bdqc.knum_blocks-1;
1117 /* Assumes caller has held the rx_queue.lock */
1118 static inline void *__prb_previous_block(struct packet_sock *po,
1119 struct packet_ring_buffer *rb,
1122 unsigned int previous = prb_previous_blk_num(rb);
1123 return prb_lookup_block(po, rb, previous, status);
1126 static inline void *packet_previous_rx_frame(struct packet_sock *po,
1127 struct packet_ring_buffer *rb,
1130 if (po->tp_version <= TPACKET_V2)
1131 return packet_previous_frame(po, rb, status);
1133 return __prb_previous_block(po, rb, status);
1136 static inline void packet_increment_rx_head(struct packet_sock *po,
1137 struct packet_ring_buffer *rb)
1139 switch (po->tp_version) {
1142 return packet_increment_head(rb);
1145 WARN(1, "TPACKET version not supported.\n");
1151 static inline void *packet_previous_frame(struct packet_sock *po,
1152 struct packet_ring_buffer *rb,
1155 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
1156 return packet_lookup_frame(po, rb, previous, status);
1159 static inline void packet_increment_head(struct packet_ring_buffer *buff)
1161 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
1164 static void packet_sock_destruct(struct sock *sk)
1166 skb_queue_purge(&sk->sk_error_queue);
1168 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
1169 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
1171 if (!sock_flag(sk, SOCK_DEAD)) {
1172 pr_err("Attempt to release alive packet socket: %p\n", sk);
1176 sk_refcnt_debug_dec(sk);
1179 static int fanout_rr_next(struct packet_fanout *f, unsigned int num)
1181 int x = atomic_read(&f->rr_cur) + 1;
1189 static struct sock *fanout_demux_hash(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
1191 u32 idx, hash = skb->rxhash;
1193 idx = ((u64)hash * num) >> 32;
1198 static struct sock *fanout_demux_lb(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
1202 cur = atomic_read(&f->rr_cur);
1203 while ((old = atomic_cmpxchg(&f->rr_cur, cur,
1204 fanout_rr_next(f, num))) != cur)
1209 static struct sock *fanout_demux_cpu(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
1211 unsigned int cpu = smp_processor_id();
1213 return f->arr[cpu % num];
1216 static struct sk_buff *fanout_check_defrag(struct sk_buff *skb)
1219 const struct iphdr *iph;
1222 if (skb->protocol != htons(ETH_P_IP))
1225 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1229 if (iph->ihl < 5 || iph->version != 4)
1231 if (!pskb_may_pull(skb, iph->ihl*4))
1234 len = ntohs(iph->tot_len);
1235 if (skb->len < len || len < (iph->ihl * 4))
1238 if (ip_is_fragment(ip_hdr(skb))) {
1239 skb = skb_share_check(skb, GFP_ATOMIC);
1241 if (pskb_trim_rcsum(skb, len))
1243 memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
1244 if (ip_defrag(skb, IP_DEFRAG_AF_PACKET))
1253 static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
1254 struct packet_type *pt, struct net_device *orig_dev)
1256 struct packet_fanout *f = pt->af_packet_priv;
1257 unsigned int num = f->num_members;
1258 struct packet_sock *po;
1261 if (!net_eq(dev_net(dev), read_pnet(&f->net)) ||
1268 case PACKET_FANOUT_HASH:
1271 skb = fanout_check_defrag(skb);
1275 skb_get_rxhash(skb);
1276 sk = fanout_demux_hash(f, skb, num);
1278 case PACKET_FANOUT_LB:
1279 sk = fanout_demux_lb(f, skb, num);
1281 case PACKET_FANOUT_CPU:
1282 sk = fanout_demux_cpu(f, skb, num);
1288 return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
1291 static DEFINE_MUTEX(fanout_mutex);
1292 static LIST_HEAD(fanout_list);
1294 static void __fanout_link(struct sock *sk, struct packet_sock *po)
1296 struct packet_fanout *f = po->fanout;
1298 spin_lock(&f->lock);
1299 f->arr[f->num_members] = sk;
1302 spin_unlock(&f->lock);
1305 static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
1307 struct packet_fanout *f = po->fanout;
1310 spin_lock(&f->lock);
1311 for (i = 0; i < f->num_members; i++) {
1312 if (f->arr[i] == sk)
1315 BUG_ON(i >= f->num_members);
1316 f->arr[i] = f->arr[f->num_members - 1];
1318 spin_unlock(&f->lock);
1321 static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
1323 struct packet_sock *po = pkt_sk(sk);
1324 struct packet_fanout *f, *match;
1325 u8 type = type_flags & 0xff;
1326 u8 defrag = (type_flags & PACKET_FANOUT_FLAG_DEFRAG) ? 1 : 0;
1330 case PACKET_FANOUT_HASH:
1331 case PACKET_FANOUT_LB:
1332 case PACKET_FANOUT_CPU:
1344 mutex_lock(&fanout_mutex);
1346 list_for_each_entry(f, &fanout_list, list) {
1348 read_pnet(&f->net) == sock_net(sk)) {
1354 if (match && match->defrag != defrag)
1358 match = kzalloc(sizeof(*match), GFP_KERNEL);
1361 write_pnet(&match->net, sock_net(sk));
1364 match->defrag = defrag;
1365 atomic_set(&match->rr_cur, 0);
1366 INIT_LIST_HEAD(&match->list);
1367 spin_lock_init(&match->lock);
1368 atomic_set(&match->sk_ref, 0);
1369 match->prot_hook.type = po->prot_hook.type;
1370 match->prot_hook.dev = po->prot_hook.dev;
1371 match->prot_hook.func = packet_rcv_fanout;
1372 match->prot_hook.af_packet_priv = match;
1373 dev_add_pack(&match->prot_hook);
1374 list_add(&match->list, &fanout_list);
1377 if (match->type == type &&
1378 match->prot_hook.type == po->prot_hook.type &&
1379 match->prot_hook.dev == po->prot_hook.dev) {
1381 if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
1382 __dev_remove_pack(&po->prot_hook);
1384 atomic_inc(&match->sk_ref);
1385 __fanout_link(sk, po);
1390 mutex_unlock(&fanout_mutex);
1394 static void fanout_release(struct sock *sk)
1396 struct packet_sock *po = pkt_sk(sk);
1397 struct packet_fanout *f;
1405 mutex_lock(&fanout_mutex);
1406 if (atomic_dec_and_test(&f->sk_ref)) {
1408 dev_remove_pack(&f->prot_hook);
1411 mutex_unlock(&fanout_mutex);
1414 static const struct proto_ops packet_ops;
1416 static const struct proto_ops packet_ops_spkt;
1418 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
1419 struct packet_type *pt, struct net_device *orig_dev)
1422 struct sockaddr_pkt *spkt;
1425 * When we registered the protocol we saved the socket in the data
1426 * field for just this event.
1429 sk = pt->af_packet_priv;
1432 * Yank back the headers [hope the device set this
1433 * right or kerboom...]
1435 * Incoming packets have ll header pulled,
1438 * For outgoing ones skb->data == skb_mac_header(skb)
1439 * so that this procedure is noop.
1442 if (skb->pkt_type == PACKET_LOOPBACK)
1445 if (!net_eq(dev_net(dev), sock_net(sk)))
1448 skb = skb_share_check(skb, GFP_ATOMIC);
1452 /* drop any routing info */
1455 /* drop conntrack reference */
1458 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
1460 skb_push(skb, skb->data - skb_mac_header(skb));
1463 * The SOCK_PACKET socket receives _all_ frames.
1466 spkt->spkt_family = dev->type;
1467 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
1468 spkt->spkt_protocol = skb->protocol;
1471 * Charge the memory to the socket. This is done specifically
1472 * to prevent sockets using all the memory up.
1475 if (sock_queue_rcv_skb(sk, skb) == 0)
1486 * Output a raw packet to a device layer. This bypasses all the other
1487 * protocol layers and you must therefore supply it with a complete frame
1490 static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
1491 struct msghdr *msg, size_t len)
1493 struct sock *sk = sock->sk;
1494 struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
1495 struct sk_buff *skb = NULL;
1496 struct net_device *dev;
1501 * Get and verify the address.
1505 if (msg->msg_namelen < sizeof(struct sockaddr))
1507 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
1508 proto = saddr->spkt_protocol;
1510 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
1513 * Find the device first to size check it
1516 saddr->spkt_device[13] = 0;
1519 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
1525 if (!(dev->flags & IFF_UP))
1529 * You may not queue a frame bigger than the mtu. This is the lowest level
1530 * raw protocol and you must do your own fragmentation at this level.
1534 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN)
1538 size_t reserved = LL_RESERVED_SPACE(dev);
1539 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
1542 skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL);
1545 /* FIXME: Save some space for broken drivers that write a hard
1546 * header at transmission time by themselves. PPP is the notable
1547 * one here. This should really be fixed at the driver level.
1549 skb_reserve(skb, reserved);
1550 skb_reset_network_header(skb);
1552 /* Try to align data part correctly */
1557 skb_reset_network_header(skb);
1559 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1565 if (len > (dev->mtu + dev->hard_header_len)) {
1566 /* Earlier code assumed this would be a VLAN pkt,
1567 * double-check this now that we have the actual
1570 struct ethhdr *ehdr;
1571 skb_reset_mac_header(skb);
1572 ehdr = eth_hdr(skb);
1573 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
1579 skb->protocol = proto;
1581 skb->priority = sk->sk_priority;
1582 skb->mark = sk->sk_mark;
1583 err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
1587 dev_queue_xmit(skb);
1598 static inline unsigned int run_filter(const struct sk_buff *skb,
1599 const struct sock *sk,
1602 struct sk_filter *filter;
1605 filter = rcu_dereference(sk->sk_filter);
1607 res = SK_RUN_FILTER(filter, skb);
1614 * This function makes lazy skb cloning in hope that most of packets
1615 * are discarded by BPF.
1617 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
1618 * and skb->cb are mangled. It works because (and until) packets
1619 * falling here are owned by current CPU. Output packets are cloned
1620 * by dev_queue_xmit_nit(), input packets are processed by net_bh
1621 * sequencially, so that if we return skb to original state on exit,
1622 * we will not harm anyone.
1625 static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
1626 struct packet_type *pt, struct net_device *orig_dev)
1629 struct sockaddr_ll *sll;
1630 struct packet_sock *po;
1631 u8 *skb_head = skb->data;
1632 int skb_len = skb->len;
1633 unsigned int snaplen, res;
1635 if (skb->pkt_type == PACKET_LOOPBACK)
1638 sk = pt->af_packet_priv;
1641 if (!net_eq(dev_net(dev), sock_net(sk)))
1646 if (dev->header_ops) {
1647 /* The device has an explicit notion of ll header,
1648 * exported to higher levels.
1650 * Otherwise, the device hides details of its frame
1651 * structure, so that corresponding packet head is
1652 * never delivered to user.
1654 if (sk->sk_type != SOCK_DGRAM)
1655 skb_push(skb, skb->data - skb_mac_header(skb));
1656 else if (skb->pkt_type == PACKET_OUTGOING) {
1657 /* Special case: outgoing packets have ll header at head */
1658 skb_pull(skb, skb_network_offset(skb));
1664 res = run_filter(skb, sk, snaplen);
1666 goto drop_n_restore;
1670 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
1671 (unsigned)sk->sk_rcvbuf)
1674 if (skb_shared(skb)) {
1675 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
1679 if (skb_head != skb->data) {
1680 skb->data = skb_head;
1687 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
1690 sll = &PACKET_SKB_CB(skb)->sa.ll;
1691 sll->sll_family = AF_PACKET;
1692 sll->sll_hatype = dev->type;
1693 sll->sll_protocol = skb->protocol;
1694 sll->sll_pkttype = skb->pkt_type;
1695 if (unlikely(po->origdev))
1696 sll->sll_ifindex = orig_dev->ifindex;
1698 sll->sll_ifindex = dev->ifindex;
1700 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
1702 PACKET_SKB_CB(skb)->origlen = skb->len;
1704 if (pskb_trim(skb, snaplen))
1707 skb_set_owner_r(skb, sk);
1711 /* drop conntrack reference */
1714 spin_lock(&sk->sk_receive_queue.lock);
1715 po->stats.tp_packets++;
1716 skb->dropcount = atomic_read(&sk->sk_drops);
1717 __skb_queue_tail(&sk->sk_receive_queue, skb);
1718 spin_unlock(&sk->sk_receive_queue.lock);
1719 sk->sk_data_ready(sk, skb->len);
1723 po->stats.tp_drops = atomic_inc_return(&sk->sk_drops);
1726 if (skb_head != skb->data && skb_shared(skb)) {
1727 skb->data = skb_head;
1735 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
1736 struct packet_type *pt, struct net_device *orig_dev)
1739 struct packet_sock *po;
1740 struct sockaddr_ll *sll;
1742 struct tpacket_hdr *h1;
1743 struct tpacket2_hdr *h2;
1744 struct tpacket3_hdr *h3;
1747 u8 *skb_head = skb->data;
1748 int skb_len = skb->len;
1749 unsigned int snaplen, res;
1750 unsigned long status = TP_STATUS_USER;
1751 unsigned short macoff, netoff, hdrlen;
1752 struct sk_buff *copy_skb = NULL;
1755 struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
1757 if (skb->pkt_type == PACKET_LOOPBACK)
1760 sk = pt->af_packet_priv;
1763 if (!net_eq(dev_net(dev), sock_net(sk)))
1766 if (dev->header_ops) {
1767 if (sk->sk_type != SOCK_DGRAM)
1768 skb_push(skb, skb->data - skb_mac_header(skb));
1769 else if (skb->pkt_type == PACKET_OUTGOING) {
1770 /* Special case: outgoing packets have ll header at head */
1771 skb_pull(skb, skb_network_offset(skb));
1775 if (skb->ip_summed == CHECKSUM_PARTIAL)
1776 status |= TP_STATUS_CSUMNOTREADY;
1780 res = run_filter(skb, sk, snaplen);
1782 goto drop_n_restore;
1786 if (sk->sk_type == SOCK_DGRAM) {
1787 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
1790 unsigned maclen = skb_network_offset(skb);
1791 netoff = TPACKET_ALIGN(po->tp_hdrlen +
1792 (maclen < 16 ? 16 : maclen)) +
1794 macoff = netoff - maclen;
1796 if (po->tp_version <= TPACKET_V2) {
1797 if (macoff + snaplen > po->rx_ring.frame_size) {
1798 if (po->copy_thresh &&
1799 atomic_read(&sk->sk_rmem_alloc) + skb->truesize
1800 < (unsigned)sk->sk_rcvbuf) {
1801 if (skb_shared(skb)) {
1802 copy_skb = skb_clone(skb, GFP_ATOMIC);
1804 copy_skb = skb_get(skb);
1805 skb_head = skb->data;
1808 skb_set_owner_r(copy_skb, sk);
1810 snaplen = po->rx_ring.frame_size - macoff;
1811 if ((int)snaplen < 0)
1815 spin_lock(&sk->sk_receive_queue.lock);
1816 h.raw = packet_current_rx_frame(po, skb,
1817 TP_STATUS_KERNEL, (macoff+snaplen));
1820 if (po->tp_version <= TPACKET_V2) {
1821 packet_increment_rx_head(po, &po->rx_ring);
1823 * LOSING will be reported till you read the stats,
1824 * because it's COR - Clear On Read.
1825 * Anyways, moving it for V1/V2 only as V3 doesn't need this
1828 if (po->stats.tp_drops)
1829 status |= TP_STATUS_LOSING;
1831 po->stats.tp_packets++;
1833 status |= TP_STATUS_COPY;
1834 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
1836 spin_unlock(&sk->sk_receive_queue.lock);
1838 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
1840 switch (po->tp_version) {
1842 h.h1->tp_len = skb->len;
1843 h.h1->tp_snaplen = snaplen;
1844 h.h1->tp_mac = macoff;
1845 h.h1->tp_net = netoff;
1846 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
1847 && shhwtstamps->syststamp.tv64)
1848 tv = ktime_to_timeval(shhwtstamps->syststamp);
1849 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
1850 && shhwtstamps->hwtstamp.tv64)
1851 tv = ktime_to_timeval(shhwtstamps->hwtstamp);
1852 else if (skb->tstamp.tv64)
1853 tv = ktime_to_timeval(skb->tstamp);
1855 do_gettimeofday(&tv);
1856 h.h1->tp_sec = tv.tv_sec;
1857 h.h1->tp_usec = tv.tv_usec;
1858 hdrlen = sizeof(*h.h1);
1861 h.h2->tp_len = skb->len;
1862 h.h2->tp_snaplen = snaplen;
1863 h.h2->tp_mac = macoff;
1864 h.h2->tp_net = netoff;
1865 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
1866 && shhwtstamps->syststamp.tv64)
1867 ts = ktime_to_timespec(shhwtstamps->syststamp);
1868 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
1869 && shhwtstamps->hwtstamp.tv64)
1870 ts = ktime_to_timespec(shhwtstamps->hwtstamp);
1871 else if (skb->tstamp.tv64)
1872 ts = ktime_to_timespec(skb->tstamp);
1874 getnstimeofday(&ts);
1875 h.h2->tp_sec = ts.tv_sec;
1876 h.h2->tp_nsec = ts.tv_nsec;
1877 if (vlan_tx_tag_present(skb)) {
1878 h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
1879 status |= TP_STATUS_VLAN_VALID;
1881 h.h2->tp_vlan_tci = 0;
1883 h.h2->tp_padding = 0;
1884 hdrlen = sizeof(*h.h2);
1887 /* tp_nxt_offset,vlan are already populated above.
1888 * So DONT clear those fields here
1890 h.h3->tp_status |= status;
1891 h.h3->tp_len = skb->len;
1892 h.h3->tp_snaplen = snaplen;
1893 h.h3->tp_mac = macoff;
1894 h.h3->tp_net = netoff;
1895 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
1896 && shhwtstamps->syststamp.tv64)
1897 ts = ktime_to_timespec(shhwtstamps->syststamp);
1898 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
1899 && shhwtstamps->hwtstamp.tv64)
1900 ts = ktime_to_timespec(shhwtstamps->hwtstamp);
1901 else if (skb->tstamp.tv64)
1902 ts = ktime_to_timespec(skb->tstamp);
1904 getnstimeofday(&ts);
1905 h.h3->tp_sec = ts.tv_sec;
1906 h.h3->tp_nsec = ts.tv_nsec;
1907 hdrlen = sizeof(*h.h3);
1913 sll = h.raw + TPACKET_ALIGN(hdrlen);
1914 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
1915 sll->sll_family = AF_PACKET;
1916 sll->sll_hatype = dev->type;
1917 sll->sll_protocol = skb->protocol;
1918 sll->sll_pkttype = skb->pkt_type;
1919 if (unlikely(po->origdev))
1920 sll->sll_ifindex = orig_dev->ifindex;
1922 sll->sll_ifindex = dev->ifindex;
1925 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
1929 if (po->tp_version <= TPACKET_V2) {
1930 end = (u8 *)PAGE_ALIGN((unsigned long)h.raw
1931 + macoff + snaplen);
1932 for (start = h.raw; start < end; start += PAGE_SIZE)
1933 flush_dcache_page(pgv_to_page(start));
1938 if (po->tp_version <= TPACKET_V2)
1939 __packet_set_status(po, h.raw, status);
1941 prb_clear_blk_fill_status(&po->rx_ring);
1943 sk->sk_data_ready(sk, 0);
1946 if (skb_head != skb->data && skb_shared(skb)) {
1947 skb->data = skb_head;
1955 po->stats.tp_drops++;
1956 spin_unlock(&sk->sk_receive_queue.lock);
1958 sk->sk_data_ready(sk, 0);
1959 kfree_skb(copy_skb);
1960 goto drop_n_restore;
1963 static void tpacket_destruct_skb(struct sk_buff *skb)
1965 struct packet_sock *po = pkt_sk(skb->sk);
1968 BUG_ON(skb == NULL);
1970 if (likely(po->tx_ring.pg_vec)) {
1971 ph = skb_shinfo(skb)->destructor_arg;
1972 BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING);
1973 BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
1974 atomic_dec(&po->tx_ring.pending);
1975 __packet_set_status(po, ph, TP_STATUS_AVAILABLE);
1981 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
1982 void *frame, struct net_device *dev, int size_max,
1983 __be16 proto, unsigned char *addr)
1986 struct tpacket_hdr *h1;
1987 struct tpacket2_hdr *h2;
1990 int to_write, offset, len, tp_len, nr_frags, len_max;
1991 struct socket *sock = po->sk.sk_socket;
1998 skb->protocol = proto;
2000 skb->priority = po->sk.sk_priority;
2001 skb->mark = po->sk.sk_mark;
2002 skb_shinfo(skb)->destructor_arg = ph.raw;
2004 switch (po->tp_version) {
2006 tp_len = ph.h2->tp_len;
2009 tp_len = ph.h1->tp_len;
2012 if (unlikely(tp_len > size_max)) {
2013 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
2017 skb_reserve(skb, LL_RESERVED_SPACE(dev));
2018 skb_reset_network_header(skb);
2020 data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
2023 if (sock->type == SOCK_DGRAM) {
2024 err = dev_hard_header(skb, dev, ntohs(proto), addr,
2026 if (unlikely(err < 0))
2028 } else if (dev->hard_header_len) {
2029 /* net device doesn't like empty head */
2030 if (unlikely(tp_len <= dev->hard_header_len)) {
2031 pr_err("packet size is too short (%d < %d)\n",
2032 tp_len, dev->hard_header_len);
2036 skb_push(skb, dev->hard_header_len);
2037 err = skb_store_bits(skb, 0, data,
2038 dev->hard_header_len);
2042 data += dev->hard_header_len;
2043 to_write -= dev->hard_header_len;
2047 offset = offset_in_page(data);
2048 len_max = PAGE_SIZE - offset;
2049 len = ((to_write > len_max) ? len_max : to_write);
2051 skb->data_len = to_write;
2052 skb->len += to_write;
2053 skb->truesize += to_write;
2054 atomic_add(to_write, &po->sk.sk_wmem_alloc);
2056 while (likely(to_write)) {
2057 nr_frags = skb_shinfo(skb)->nr_frags;
2059 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
2060 pr_err("Packet exceed the number of skb frags(%lu)\n",
2065 page = pgv_to_page(data);
2067 flush_dcache_page(page);
2069 skb_fill_page_desc(skb, nr_frags, page, offset, len);
2072 len_max = PAGE_SIZE;
2073 len = ((to_write > len_max) ? len_max : to_write);
2079 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
2081 struct sk_buff *skb;
2082 struct net_device *dev;
2084 bool need_rls_dev = false;
2085 int err, reserve = 0;
2087 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
2088 int tp_len, size_max;
2089 unsigned char *addr;
2093 mutex_lock(&po->pg_vec_lock);
2096 if (saddr == NULL) {
2097 dev = po->prot_hook.dev;
2102 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2104 if (msg->msg_namelen < (saddr->sll_halen
2105 + offsetof(struct sockaddr_ll,
2108 proto = saddr->sll_protocol;
2109 addr = saddr->sll_addr;
2110 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
2111 need_rls_dev = true;
2115 if (unlikely(dev == NULL))
2118 reserve = dev->hard_header_len;
2121 if (unlikely(!(dev->flags & IFF_UP)))
2124 size_max = po->tx_ring.frame_size
2125 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
2127 if (size_max > dev->mtu + reserve)
2128 size_max = dev->mtu + reserve;
2131 ph = packet_current_frame(po, &po->tx_ring,
2132 TP_STATUS_SEND_REQUEST);
2134 if (unlikely(ph == NULL)) {
2139 status = TP_STATUS_SEND_REQUEST;
2140 skb = sock_alloc_send_skb(&po->sk,
2141 LL_ALLOCATED_SPACE(dev)
2142 + sizeof(struct sockaddr_ll),
2145 if (unlikely(skb == NULL))
2148 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
2151 if (unlikely(tp_len < 0)) {
2153 __packet_set_status(po, ph,
2154 TP_STATUS_AVAILABLE);
2155 packet_increment_head(&po->tx_ring);
2159 status = TP_STATUS_WRONG_FORMAT;
2165 skb->destructor = tpacket_destruct_skb;
2166 __packet_set_status(po, ph, TP_STATUS_SENDING);
2167 atomic_inc(&po->tx_ring.pending);
2169 status = TP_STATUS_SEND_REQUEST;
2170 err = dev_queue_xmit(skb);
2171 if (unlikely(err > 0)) {
2172 err = net_xmit_errno(err);
2173 if (err && __packet_get_status(po, ph) ==
2174 TP_STATUS_AVAILABLE) {
2175 /* skb was destructed already */
2180 * skb was dropped but not destructed yet;
2181 * let's treat it like congestion or err < 0
2185 packet_increment_head(&po->tx_ring);
2187 } while (likely((ph != NULL) ||
2188 ((!(msg->msg_flags & MSG_DONTWAIT)) &&
2189 (atomic_read(&po->tx_ring.pending))))
2196 __packet_set_status(po, ph, status);
2202 mutex_unlock(&po->pg_vec_lock);
2206 static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
2207 size_t reserve, size_t len,
2208 size_t linear, int noblock,
2211 struct sk_buff *skb;
2213 /* Under a page? Don't bother with paged skb. */
2214 if (prepad + len < PAGE_SIZE || !linear)
2217 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
2222 skb_reserve(skb, reserve);
2223 skb_put(skb, linear);
2224 skb->data_len = len - linear;
2225 skb->len += len - linear;
2230 static int packet_snd(struct socket *sock,
2231 struct msghdr *msg, size_t len)
2233 struct sock *sk = sock->sk;
2234 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
2235 struct sk_buff *skb;
2236 struct net_device *dev;
2238 bool need_rls_dev = false;
2239 unsigned char *addr;
2240 int err, reserve = 0;
2241 struct virtio_net_hdr vnet_hdr = { 0 };
2244 struct packet_sock *po = pkt_sk(sk);
2245 unsigned short gso_type = 0;
2248 * Get and verify the address.
2251 if (saddr == NULL) {
2252 dev = po->prot_hook.dev;
2257 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2259 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
2261 proto = saddr->sll_protocol;
2262 addr = saddr->sll_addr;
2263 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
2264 need_rls_dev = true;
2270 if (sock->type == SOCK_RAW)
2271 reserve = dev->hard_header_len;
2274 if (!(dev->flags & IFF_UP))
2277 if (po->has_vnet_hdr) {
2278 vnet_hdr_len = sizeof(vnet_hdr);
2281 if (len < vnet_hdr_len)
2284 len -= vnet_hdr_len;
2286 err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov,
2291 if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
2292 (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 >
2294 vnet_hdr.hdr_len = vnet_hdr.csum_start +
2295 vnet_hdr.csum_offset + 2;
2298 if (vnet_hdr.hdr_len > len)
2301 if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2302 switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2303 case VIRTIO_NET_HDR_GSO_TCPV4:
2304 gso_type = SKB_GSO_TCPV4;
2306 case VIRTIO_NET_HDR_GSO_TCPV6:
2307 gso_type = SKB_GSO_TCPV6;
2309 case VIRTIO_NET_HDR_GSO_UDP:
2310 gso_type = SKB_GSO_UDP;
2316 if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
2317 gso_type |= SKB_GSO_TCP_ECN;
2319 if (vnet_hdr.gso_size == 0)
2326 if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN))
2330 skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev),
2331 LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len,
2332 msg->msg_flags & MSG_DONTWAIT, &err);
2336 skb_set_network_header(skb, reserve);
2339 if (sock->type == SOCK_DGRAM &&
2340 (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0)
2343 /* Returns -EFAULT on error */
2344 err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len);
2347 err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
2351 if (!gso_type && (len > dev->mtu + reserve)) {
2352 /* Earlier code assumed this would be a VLAN pkt,
2353 * double-check this now that we have the actual
2356 struct ethhdr *ehdr;
2357 skb_reset_mac_header(skb);
2358 ehdr = eth_hdr(skb);
2359 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
2365 skb->protocol = proto;
2367 skb->priority = sk->sk_priority;
2368 skb->mark = sk->sk_mark;
2370 if (po->has_vnet_hdr) {
2371 if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
2372 if (!skb_partial_csum_set(skb, vnet_hdr.csum_start,
2373 vnet_hdr.csum_offset)) {
2379 skb_shinfo(skb)->gso_size = vnet_hdr.gso_size;
2380 skb_shinfo(skb)->gso_type = gso_type;
2382 /* Header must be checked, and gso_segs computed. */
2383 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2384 skb_shinfo(skb)->gso_segs = 0;
2386 len += vnet_hdr_len;
2393 err = dev_queue_xmit(skb);
2394 if (err > 0 && (err = net_xmit_errno(err)) != 0)
2405 if (dev && need_rls_dev)
2411 static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
2412 struct msghdr *msg, size_t len)
2414 struct sock *sk = sock->sk;
2415 struct packet_sock *po = pkt_sk(sk);
2416 if (po->tx_ring.pg_vec)
2417 return tpacket_snd(po, msg);
2419 return packet_snd(sock, msg, len);
2423 * Close a PACKET socket. This is fairly simple. We immediately go
2424 * to 'closed' state and remove our protocol entry in the device list.
2427 static int packet_release(struct socket *sock)
2429 struct sock *sk = sock->sk;
2430 struct packet_sock *po;
2432 union tpacket_req_u req_u;
2440 spin_lock_bh(&net->packet.sklist_lock);
2441 sk_del_node_init_rcu(sk);
2442 sock_prot_inuse_add(net, sk->sk_prot, -1);
2443 spin_unlock_bh(&net->packet.sklist_lock);
2445 spin_lock(&po->bind_lock);
2446 unregister_prot_hook(sk, false);
2447 if (po->prot_hook.dev) {
2448 dev_put(po->prot_hook.dev);
2449 po->prot_hook.dev = NULL;
2451 spin_unlock(&po->bind_lock);
2453 packet_flush_mclist(sk);
2455 memset(&req_u, 0, sizeof(req_u));
2457 if (po->rx_ring.pg_vec)
2458 packet_set_ring(sk, &req_u, 1, 0);
2460 if (po->tx_ring.pg_vec)
2461 packet_set_ring(sk, &req_u, 1, 1);
2467 * Now the socket is dead. No more input will appear.
2474 skb_queue_purge(&sk->sk_receive_queue);
2475 sk_refcnt_debug_release(sk);
2482 * Attach a packet hook.
2485 static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
2487 struct packet_sock *po = pkt_sk(sk);
2494 spin_lock(&po->bind_lock);
2495 unregister_prot_hook(sk, true);
2497 po->prot_hook.type = protocol;
2498 if (po->prot_hook.dev)
2499 dev_put(po->prot_hook.dev);
2500 po->prot_hook.dev = dev;
2502 po->ifindex = dev ? dev->ifindex : 0;
2507 if (!dev || (dev->flags & IFF_UP)) {
2508 register_prot_hook(sk);
2510 sk->sk_err = ENETDOWN;
2511 if (!sock_flag(sk, SOCK_DEAD))
2512 sk->sk_error_report(sk);
2516 spin_unlock(&po->bind_lock);
2522 * Bind a packet socket to a device
2525 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
2528 struct sock *sk = sock->sk;
2530 struct net_device *dev;
2537 if (addr_len != sizeof(struct sockaddr))
2539 strlcpy(name, uaddr->sa_data, sizeof(name));
2541 dev = dev_get_by_name(sock_net(sk), name);
2543 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
2547 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
2549 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
2550 struct sock *sk = sock->sk;
2551 struct net_device *dev = NULL;
2559 if (addr_len < sizeof(struct sockaddr_ll))
2561 if (sll->sll_family != AF_PACKET)
2564 if (sll->sll_ifindex) {
2566 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
2570 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
2576 static struct proto packet_proto = {
2578 .owner = THIS_MODULE,
2579 .obj_size = sizeof(struct packet_sock),
2583 * Create a packet of type SOCK_PACKET.
2586 static int packet_create(struct net *net, struct socket *sock, int protocol,
2590 struct packet_sock *po;
2591 __be16 proto = (__force __be16)protocol; /* weird, but documented */
2594 if (!capable(CAP_NET_RAW))
2596 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
2597 sock->type != SOCK_PACKET)
2598 return -ESOCKTNOSUPPORT;
2600 sock->state = SS_UNCONNECTED;
2603 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
2607 sock->ops = &packet_ops;
2608 if (sock->type == SOCK_PACKET)
2609 sock->ops = &packet_ops_spkt;
2611 sock_init_data(sock, sk);
2614 sk->sk_family = PF_PACKET;
2617 sk->sk_destruct = packet_sock_destruct;
2618 sk_refcnt_debug_inc(sk);
2621 * Attach a protocol block
2624 spin_lock_init(&po->bind_lock);
2625 mutex_init(&po->pg_vec_lock);
2626 po->prot_hook.func = packet_rcv;
2628 if (sock->type == SOCK_PACKET)
2629 po->prot_hook.func = packet_rcv_spkt;
2631 po->prot_hook.af_packet_priv = sk;
2634 po->prot_hook.type = proto;
2635 register_prot_hook(sk);
2638 spin_lock_bh(&net->packet.sklist_lock);
2639 sk_add_node_rcu(sk, &net->packet.sklist);
2640 sock_prot_inuse_add(net, &packet_proto, 1);
2641 spin_unlock_bh(&net->packet.sklist_lock);
2648 static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len)
2650 struct sock_exterr_skb *serr;
2651 struct sk_buff *skb, *skb2;
2655 skb = skb_dequeue(&sk->sk_error_queue);
2661 msg->msg_flags |= MSG_TRUNC;
2664 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2668 sock_recv_timestamp(msg, sk, skb);
2670 serr = SKB_EXT_ERR(skb);
2671 put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP,
2672 sizeof(serr->ee), &serr->ee);
2674 msg->msg_flags |= MSG_ERRQUEUE;
2677 /* Reset and regenerate socket error */
2678 spin_lock_bh(&sk->sk_error_queue.lock);
2680 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
2681 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
2682 spin_unlock_bh(&sk->sk_error_queue.lock);
2683 sk->sk_error_report(sk);
2685 spin_unlock_bh(&sk->sk_error_queue.lock);
2694 * Pull a packet from our receive queue and hand it to the user.
2695 * If necessary we block.
2698 static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
2699 struct msghdr *msg, size_t len, int flags)
2701 struct sock *sk = sock->sk;
2702 struct sk_buff *skb;
2704 struct sockaddr_ll *sll;
2705 int vnet_hdr_len = 0;
2708 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
2712 /* What error should we return now? EUNATTACH? */
2713 if (pkt_sk(sk)->ifindex < 0)
2717 if (flags & MSG_ERRQUEUE) {
2718 err = packet_recv_error(sk, msg, len);
2723 * Call the generic datagram receiver. This handles all sorts
2724 * of horrible races and re-entrancy so we can forget about it
2725 * in the protocol layers.
2727 * Now it will return ENETDOWN, if device have just gone down,
2728 * but then it will block.
2731 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
2734 * An error occurred so return it. Because skb_recv_datagram()
2735 * handles the blocking we don't see and worry about blocking
2742 if (pkt_sk(sk)->has_vnet_hdr) {
2743 struct virtio_net_hdr vnet_hdr = { 0 };
2746 vnet_hdr_len = sizeof(vnet_hdr);
2747 if (len < vnet_hdr_len)
2750 len -= vnet_hdr_len;
2752 if (skb_is_gso(skb)) {
2753 struct skb_shared_info *sinfo = skb_shinfo(skb);
2755 /* This is a hint as to how much should be linear. */
2756 vnet_hdr.hdr_len = skb_headlen(skb);
2757 vnet_hdr.gso_size = sinfo->gso_size;
2758 if (sinfo->gso_type & SKB_GSO_TCPV4)
2759 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
2760 else if (sinfo->gso_type & SKB_GSO_TCPV6)
2761 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
2762 else if (sinfo->gso_type & SKB_GSO_UDP)
2763 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
2764 else if (sinfo->gso_type & SKB_GSO_FCOE)
2768 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
2769 vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
2771 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
2773 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2774 vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
2775 vnet_hdr.csum_start = skb_checksum_start_offset(skb);
2776 vnet_hdr.csum_offset = skb->csum_offset;
2777 } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
2778 vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID;
2779 } /* else everything is zero */
2781 err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr,
2788 * If the address length field is there to be filled in, we fill
2792 sll = &PACKET_SKB_CB(skb)->sa.ll;
2793 if (sock->type == SOCK_PACKET)
2794 msg->msg_namelen = sizeof(struct sockaddr_pkt);
2796 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
2799 * You lose any data beyond the buffer you gave. If it worries a
2800 * user program they can ask the device for its MTU anyway.
2806 msg->msg_flags |= MSG_TRUNC;
2809 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2813 sock_recv_ts_and_drops(msg, sk, skb);
2816 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
2819 if (pkt_sk(sk)->auxdata) {
2820 struct tpacket_auxdata aux;
2822 aux.tp_status = TP_STATUS_USER;
2823 if (skb->ip_summed == CHECKSUM_PARTIAL)
2824 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
2825 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
2826 aux.tp_snaplen = skb->len;
2828 aux.tp_net = skb_network_offset(skb);
2829 if (vlan_tx_tag_present(skb)) {
2830 aux.tp_vlan_tci = vlan_tx_tag_get(skb);
2831 aux.tp_status |= TP_STATUS_VLAN_VALID;
2833 aux.tp_vlan_tci = 0;
2836 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
2840 * Free or return the buffer as appropriate. Again this
2841 * hides all the races and re-entrancy issues from us.
2843 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
2846 skb_free_datagram(sk, skb);
2851 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
2852 int *uaddr_len, int peer)
2854 struct net_device *dev;
2855 struct sock *sk = sock->sk;
2860 uaddr->sa_family = AF_PACKET;
2862 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
2864 strncpy(uaddr->sa_data, dev->name, 14);
2866 memset(uaddr->sa_data, 0, 14);
2868 *uaddr_len = sizeof(*uaddr);
2873 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
2874 int *uaddr_len, int peer)
2876 struct net_device *dev;
2877 struct sock *sk = sock->sk;
2878 struct packet_sock *po = pkt_sk(sk);
2879 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
2884 sll->sll_family = AF_PACKET;
2885 sll->sll_ifindex = po->ifindex;
2886 sll->sll_protocol = po->num;
2887 sll->sll_pkttype = 0;
2889 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
2891 sll->sll_hatype = dev->type;
2892 sll->sll_halen = dev->addr_len;
2893 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
2895 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
2899 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
2904 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
2908 case PACKET_MR_MULTICAST:
2909 if (i->alen != dev->addr_len)
2912 return dev_mc_add(dev, i->addr);
2914 return dev_mc_del(dev, i->addr);
2916 case PACKET_MR_PROMISC:
2917 return dev_set_promiscuity(dev, what);
2919 case PACKET_MR_ALLMULTI:
2920 return dev_set_allmulti(dev, what);
2922 case PACKET_MR_UNICAST:
2923 if (i->alen != dev->addr_len)
2926 return dev_uc_add(dev, i->addr);
2928 return dev_uc_del(dev, i->addr);
2936 static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
2938 for ( ; i; i = i->next) {
2939 if (i->ifindex == dev->ifindex)
2940 packet_dev_mc(dev, i, what);
2944 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
2946 struct packet_sock *po = pkt_sk(sk);
2947 struct packet_mclist *ml, *i;
2948 struct net_device *dev;
2954 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
2959 if (mreq->mr_alen > dev->addr_len)
2963 i = kmalloc(sizeof(*i), GFP_KERNEL);
2968 for (ml = po->mclist; ml; ml = 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) {
2974 /* Free the new element ... */
2980 i->type = mreq->mr_type;
2981 i->ifindex = mreq->mr_ifindex;
2982 i->alen = mreq->mr_alen;
2983 memcpy(i->addr, mreq->mr_address, i->alen);
2985 i->next = po->mclist;
2987 err = packet_dev_mc(dev, i, 1);
2989 po->mclist = i->next;
2998 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
3000 struct packet_mclist *ml, **mlp;
3004 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
3005 if (ml->ifindex == mreq->mr_ifindex &&
3006 ml->type == mreq->mr_type &&
3007 ml->alen == mreq->mr_alen &&
3008 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3009 if (--ml->count == 0) {
3010 struct net_device *dev;
3012 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3014 packet_dev_mc(dev, ml, -1);
3022 return -EADDRNOTAVAIL;
3025 static void packet_flush_mclist(struct sock *sk)
3027 struct packet_sock *po = pkt_sk(sk);
3028 struct packet_mclist *ml;
3034 while ((ml = po->mclist) != NULL) {
3035 struct net_device *dev;
3037 po->mclist = ml->next;
3038 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3040 packet_dev_mc(dev, ml, -1);
3047 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
3049 struct sock *sk = sock->sk;
3050 struct packet_sock *po = pkt_sk(sk);
3053 if (level != SOL_PACKET)
3054 return -ENOPROTOOPT;
3057 case PACKET_ADD_MEMBERSHIP:
3058 case PACKET_DROP_MEMBERSHIP:
3060 struct packet_mreq_max mreq;
3062 memset(&mreq, 0, sizeof(mreq));
3063 if (len < sizeof(struct packet_mreq))
3065 if (len > sizeof(mreq))
3067 if (copy_from_user(&mreq, optval, len))
3069 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
3071 if (optname == PACKET_ADD_MEMBERSHIP)
3072 ret = packet_mc_add(sk, &mreq);
3074 ret = packet_mc_drop(sk, &mreq);
3078 case PACKET_RX_RING:
3079 case PACKET_TX_RING:
3081 union tpacket_req_u req_u;
3084 switch (po->tp_version) {
3087 len = sizeof(req_u.req);
3091 len = sizeof(req_u.req3);
3096 if (pkt_sk(sk)->has_vnet_hdr)
3098 if (copy_from_user(&req_u.req, optval, len))
3100 return packet_set_ring(sk, &req_u, 0,
3101 optname == PACKET_TX_RING);
3103 case PACKET_COPY_THRESH:
3107 if (optlen != sizeof(val))
3109 if (copy_from_user(&val, optval, sizeof(val)))
3112 pkt_sk(sk)->copy_thresh = val;
3115 case PACKET_VERSION:
3119 if (optlen != sizeof(val))
3121 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3123 if (copy_from_user(&val, optval, sizeof(val)))
3129 po->tp_version = val;
3135 case PACKET_RESERVE:
3139 if (optlen != sizeof(val))
3141 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3143 if (copy_from_user(&val, optval, sizeof(val)))
3145 po->tp_reserve = val;
3152 if (optlen != sizeof(val))
3154 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3156 if (copy_from_user(&val, optval, sizeof(val)))
3158 po->tp_loss = !!val;
3161 case PACKET_AUXDATA:
3165 if (optlen < sizeof(val))
3167 if (copy_from_user(&val, optval, sizeof(val)))
3170 po->auxdata = !!val;
3173 case PACKET_ORIGDEV:
3177 if (optlen < sizeof(val))
3179 if (copy_from_user(&val, optval, sizeof(val)))
3182 po->origdev = !!val;
3185 case PACKET_VNET_HDR:
3189 if (sock->type != SOCK_RAW)
3191 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3193 if (optlen < sizeof(val))
3195 if (copy_from_user(&val, optval, sizeof(val)))
3198 po->has_vnet_hdr = !!val;
3201 case PACKET_TIMESTAMP:
3205 if (optlen != sizeof(val))
3207 if (copy_from_user(&val, optval, sizeof(val)))
3210 po->tp_tstamp = val;
3217 if (optlen != sizeof(val))
3219 if (copy_from_user(&val, optval, sizeof(val)))
3222 return fanout_add(sk, val & 0xffff, val >> 16);
3225 return -ENOPROTOOPT;
3229 static int packet_getsockopt(struct socket *sock, int level, int optname,
3230 char __user *optval, int __user *optlen)
3234 struct sock *sk = sock->sk;
3235 struct packet_sock *po = pkt_sk(sk);
3237 struct tpacket_stats st;
3238 union tpacket_stats_u st_u;
3240 if (level != SOL_PACKET)
3241 return -ENOPROTOOPT;
3243 if (get_user(len, optlen))
3250 case PACKET_STATISTICS:
3251 if (po->tp_version == TPACKET_V3) {
3252 len = sizeof(struct tpacket_stats_v3);
3254 if (len > sizeof(struct tpacket_stats))
3255 len = sizeof(struct tpacket_stats);
3257 spin_lock_bh(&sk->sk_receive_queue.lock);
3258 if (po->tp_version == TPACKET_V3) {
3259 memcpy(&st_u.stats3, &po->stats,
3260 sizeof(struct tpacket_stats));
3261 st_u.stats3.tp_freeze_q_cnt =
3262 po->stats_u.stats3.tp_freeze_q_cnt;
3263 st_u.stats3.tp_packets += po->stats.tp_drops;
3264 data = &st_u.stats3;
3267 st.tp_packets += st.tp_drops;
3270 memset(&po->stats, 0, sizeof(st));
3271 spin_unlock_bh(&sk->sk_receive_queue.lock);
3273 case PACKET_AUXDATA:
3274 if (len > sizeof(int))
3280 case PACKET_ORIGDEV:
3281 if (len > sizeof(int))
3287 case PACKET_VNET_HDR:
3288 if (len > sizeof(int))
3290 val = po->has_vnet_hdr;
3294 case PACKET_VERSION:
3295 if (len > sizeof(int))
3297 val = po->tp_version;
3301 if (len > sizeof(int))
3303 if (copy_from_user(&val, optval, len))
3307 val = sizeof(struct tpacket_hdr);
3310 val = sizeof(struct tpacket2_hdr);
3313 val = sizeof(struct tpacket3_hdr);
3320 case PACKET_RESERVE:
3321 if (len > sizeof(unsigned int))
3322 len = sizeof(unsigned int);
3323 val = po->tp_reserve;
3327 if (len > sizeof(unsigned int))
3328 len = sizeof(unsigned int);
3332 case PACKET_TIMESTAMP:
3333 if (len > sizeof(int))
3335 val = po->tp_tstamp;
3339 if (len > sizeof(int))
3342 ((u32)po->fanout->id |
3343 ((u32)po->fanout->type << 16)) :
3348 return -ENOPROTOOPT;
3351 if (put_user(len, optlen))
3353 if (copy_to_user(optval, data, len))
3359 static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
3362 struct hlist_node *node;
3363 struct net_device *dev = data;
3364 struct net *net = dev_net(dev);
3367 sk_for_each_rcu(sk, node, &net->packet.sklist) {
3368 struct packet_sock *po = pkt_sk(sk);
3371 case NETDEV_UNREGISTER:
3373 packet_dev_mclist(dev, po->mclist, -1);
3377 if (dev->ifindex == po->ifindex) {
3378 spin_lock(&po->bind_lock);
3380 __unregister_prot_hook(sk, false);
3381 sk->sk_err = ENETDOWN;
3382 if (!sock_flag(sk, SOCK_DEAD))
3383 sk->sk_error_report(sk);
3385 if (msg == NETDEV_UNREGISTER) {
3387 if (po->prot_hook.dev)
3388 dev_put(po->prot_hook.dev);
3389 po->prot_hook.dev = NULL;
3391 spin_unlock(&po->bind_lock);
3395 if (dev->ifindex == po->ifindex) {
3396 spin_lock(&po->bind_lock);
3398 register_prot_hook(sk);
3399 spin_unlock(&po->bind_lock);
3409 static int packet_ioctl(struct socket *sock, unsigned int cmd,
3412 struct sock *sk = sock->sk;
3417 int amount = sk_wmem_alloc_get(sk);
3419 return put_user(amount, (int __user *)arg);
3423 struct sk_buff *skb;
3426 spin_lock_bh(&sk->sk_receive_queue.lock);
3427 skb = skb_peek(&sk->sk_receive_queue);
3430 spin_unlock_bh(&sk->sk_receive_queue.lock);
3431 return put_user(amount, (int __user *)arg);
3434 return sock_get_timestamp(sk, (struct timeval __user *)arg);
3436 return sock_get_timestampns(sk, (struct timespec __user *)arg);
3446 case SIOCGIFBRDADDR:
3447 case SIOCSIFBRDADDR:
3448 case SIOCGIFNETMASK:
3449 case SIOCSIFNETMASK:
3450 case SIOCGIFDSTADDR:
3451 case SIOCSIFDSTADDR:
3453 return inet_dgram_ops.ioctl(sock, cmd, arg);
3457 return -ENOIOCTLCMD;
3462 static unsigned int packet_poll(struct file *file, struct socket *sock,
3465 struct sock *sk = sock->sk;
3466 struct packet_sock *po = pkt_sk(sk);
3467 unsigned int mask = datagram_poll(file, sock, wait);
3469 spin_lock_bh(&sk->sk_receive_queue.lock);
3470 if (po->rx_ring.pg_vec) {
3471 if (!packet_previous_rx_frame(po, &po->rx_ring,
3473 mask |= POLLIN | POLLRDNORM;
3475 spin_unlock_bh(&sk->sk_receive_queue.lock);
3476 spin_lock_bh(&sk->sk_write_queue.lock);
3477 if (po->tx_ring.pg_vec) {
3478 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
3479 mask |= POLLOUT | POLLWRNORM;
3481 spin_unlock_bh(&sk->sk_write_queue.lock);
3486 /* Dirty? Well, I still did not learn better way to account
3490 static void packet_mm_open(struct vm_area_struct *vma)
3492 struct file *file = vma->vm_file;
3493 struct socket *sock = file->private_data;
3494 struct sock *sk = sock->sk;
3497 atomic_inc(&pkt_sk(sk)->mapped);
3500 static void packet_mm_close(struct vm_area_struct *vma)
3502 struct file *file = vma->vm_file;
3503 struct socket *sock = file->private_data;
3504 struct sock *sk = sock->sk;
3507 atomic_dec(&pkt_sk(sk)->mapped);
3510 static const struct vm_operations_struct packet_mmap_ops = {
3511 .open = packet_mm_open,
3512 .close = packet_mm_close,
3515 static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
3520 for (i = 0; i < len; i++) {
3521 if (likely(pg_vec[i].buffer)) {
3522 if (is_vmalloc_addr(pg_vec[i].buffer))
3523 vfree(pg_vec[i].buffer);
3525 free_pages((unsigned long)pg_vec[i].buffer,
3527 pg_vec[i].buffer = NULL;
3533 static inline char *alloc_one_pg_vec_page(unsigned long order)
3535 char *buffer = NULL;
3536 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
3537 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
3539 buffer = (char *) __get_free_pages(gfp_flags, order);
3545 * __get_free_pages failed, fall back to vmalloc
3547 buffer = vzalloc((1 << order) * PAGE_SIZE);
3553 * vmalloc failed, lets dig into swap here
3555 gfp_flags &= ~__GFP_NORETRY;
3556 buffer = (char *)__get_free_pages(gfp_flags, order);
3561 * complete and utter failure
3566 static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
3568 unsigned int block_nr = req->tp_block_nr;
3572 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
3573 if (unlikely(!pg_vec))
3576 for (i = 0; i < block_nr; i++) {
3577 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
3578 if (unlikely(!pg_vec[i].buffer))
3579 goto out_free_pgvec;
3586 free_pg_vec(pg_vec, order, block_nr);
3591 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
3592 int closing, int tx_ring)
3594 struct pgv *pg_vec = NULL;
3595 struct packet_sock *po = pkt_sk(sk);
3596 int was_running, order = 0;
3597 struct packet_ring_buffer *rb;
3598 struct sk_buff_head *rb_queue;
3601 /* Added to avoid minimal code churn */
3602 struct tpacket_req *req = &req_u->req;
3604 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
3605 if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) {
3606 WARN(1, "Tx-ring is not supported.\n");
3610 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
3611 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
3615 if (atomic_read(&po->mapped))
3617 if (atomic_read(&rb->pending))
3621 if (req->tp_block_nr) {
3622 /* Sanity tests and some calculations */
3624 if (unlikely(rb->pg_vec))
3627 switch (po->tp_version) {
3629 po->tp_hdrlen = TPACKET_HDRLEN;
3632 po->tp_hdrlen = TPACKET2_HDRLEN;
3635 po->tp_hdrlen = TPACKET3_HDRLEN;
3640 if (unlikely((int)req->tp_block_size <= 0))
3642 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
3644 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
3647 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
3650 rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
3651 if (unlikely(rb->frames_per_block <= 0))
3653 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
3658 order = get_order(req->tp_block_size);
3659 pg_vec = alloc_pg_vec(req, order);
3660 if (unlikely(!pg_vec))
3662 switch (po->tp_version) {
3664 /* Transmit path is not supported. We checked
3665 * it above but just being paranoid
3668 init_prb_bdqc(po, rb, pg_vec, req_u, tx_ring);
3677 if (unlikely(req->tp_frame_nr))
3683 /* Detach socket from network */
3684 spin_lock(&po->bind_lock);
3685 was_running = po->running;
3689 __unregister_prot_hook(sk, false);
3691 spin_unlock(&po->bind_lock);
3696 mutex_lock(&po->pg_vec_lock);
3697 if (closing || atomic_read(&po->mapped) == 0) {
3699 spin_lock_bh(&rb_queue->lock);
3700 swap(rb->pg_vec, pg_vec);
3701 rb->frame_max = (req->tp_frame_nr - 1);
3703 rb->frame_size = req->tp_frame_size;
3704 spin_unlock_bh(&rb_queue->lock);
3706 swap(rb->pg_vec_order, order);
3707 swap(rb->pg_vec_len, req->tp_block_nr);
3709 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
3710 po->prot_hook.func = (po->rx_ring.pg_vec) ?
3711 tpacket_rcv : packet_rcv;
3712 skb_queue_purge(rb_queue);
3713 if (atomic_read(&po->mapped))
3714 pr_err("packet_mmap: vma is busy: %d\n",
3715 atomic_read(&po->mapped));
3717 mutex_unlock(&po->pg_vec_lock);
3719 spin_lock(&po->bind_lock);
3722 register_prot_hook(sk);
3724 spin_unlock(&po->bind_lock);
3725 if (closing && (po->tp_version > TPACKET_V2)) {
3726 /* Because we don't support block-based V3 on tx-ring */
3728 prb_shutdown_retire_blk_timer(po, tx_ring, rb_queue);
3733 free_pg_vec(pg_vec, order, req->tp_block_nr);
3738 static int packet_mmap(struct file *file, struct socket *sock,
3739 struct vm_area_struct *vma)
3741 struct sock *sk = sock->sk;
3742 struct packet_sock *po = pkt_sk(sk);
3743 unsigned long size, expected_size;
3744 struct packet_ring_buffer *rb;
3745 unsigned long start;
3752 mutex_lock(&po->pg_vec_lock);
3755 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
3757 expected_size += rb->pg_vec_len
3763 if (expected_size == 0)
3766 size = vma->vm_end - vma->vm_start;
3767 if (size != expected_size)
3770 start = vma->vm_start;
3771 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
3772 if (rb->pg_vec == NULL)
3775 for (i = 0; i < rb->pg_vec_len; i++) {
3777 void *kaddr = rb->pg_vec[i].buffer;
3780 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
3781 page = pgv_to_page(kaddr);
3782 err = vm_insert_page(vma, start, page);
3791 atomic_inc(&po->mapped);
3792 vma->vm_ops = &packet_mmap_ops;
3796 mutex_unlock(&po->pg_vec_lock);
3800 static const struct proto_ops packet_ops_spkt = {
3801 .family = PF_PACKET,
3802 .owner = THIS_MODULE,
3803 .release = packet_release,
3804 .bind = packet_bind_spkt,
3805 .connect = sock_no_connect,
3806 .socketpair = sock_no_socketpair,
3807 .accept = sock_no_accept,
3808 .getname = packet_getname_spkt,
3809 .poll = datagram_poll,
3810 .ioctl = packet_ioctl,
3811 .listen = sock_no_listen,
3812 .shutdown = sock_no_shutdown,
3813 .setsockopt = sock_no_setsockopt,
3814 .getsockopt = sock_no_getsockopt,
3815 .sendmsg = packet_sendmsg_spkt,
3816 .recvmsg = packet_recvmsg,
3817 .mmap = sock_no_mmap,
3818 .sendpage = sock_no_sendpage,
3821 static const struct proto_ops packet_ops = {
3822 .family = PF_PACKET,
3823 .owner = THIS_MODULE,
3824 .release = packet_release,
3825 .bind = packet_bind,
3826 .connect = sock_no_connect,
3827 .socketpair = sock_no_socketpair,
3828 .accept = sock_no_accept,
3829 .getname = packet_getname,
3830 .poll = packet_poll,
3831 .ioctl = packet_ioctl,
3832 .listen = sock_no_listen,
3833 .shutdown = sock_no_shutdown,
3834 .setsockopt = packet_setsockopt,
3835 .getsockopt = packet_getsockopt,
3836 .sendmsg = packet_sendmsg,
3837 .recvmsg = packet_recvmsg,
3838 .mmap = packet_mmap,
3839 .sendpage = sock_no_sendpage,
3842 static const struct net_proto_family packet_family_ops = {
3843 .family = PF_PACKET,
3844 .create = packet_create,
3845 .owner = THIS_MODULE,
3848 static struct notifier_block packet_netdev_notifier = {
3849 .notifier_call = packet_notifier,
3852 #ifdef CONFIG_PROC_FS
3854 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
3857 struct net *net = seq_file_net(seq);
3860 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
3863 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3865 struct net *net = seq_file_net(seq);
3866 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
3869 static void packet_seq_stop(struct seq_file *seq, void *v)
3875 static int packet_seq_show(struct seq_file *seq, void *v)
3877 if (v == SEQ_START_TOKEN)
3878 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
3880 struct sock *s = sk_entry(v);
3881 const struct packet_sock *po = pkt_sk(s);
3884 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
3886 atomic_read(&s->sk_refcnt),
3891 atomic_read(&s->sk_rmem_alloc),
3899 static const struct seq_operations packet_seq_ops = {
3900 .start = packet_seq_start,
3901 .next = packet_seq_next,
3902 .stop = packet_seq_stop,
3903 .show = packet_seq_show,
3906 static int packet_seq_open(struct inode *inode, struct file *file)
3908 return seq_open_net(inode, file, &packet_seq_ops,
3909 sizeof(struct seq_net_private));
3912 static const struct file_operations packet_seq_fops = {
3913 .owner = THIS_MODULE,
3914 .open = packet_seq_open,
3916 .llseek = seq_lseek,
3917 .release = seq_release_net,
3922 static int __net_init packet_net_init(struct net *net)
3924 spin_lock_init(&net->packet.sklist_lock);
3925 INIT_HLIST_HEAD(&net->packet.sklist);
3927 if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
3933 static void __net_exit packet_net_exit(struct net *net)
3935 proc_net_remove(net, "packet");
3938 static struct pernet_operations packet_net_ops = {
3939 .init = packet_net_init,
3940 .exit = packet_net_exit,
3944 static void __exit packet_exit(void)
3946 unregister_netdevice_notifier(&packet_netdev_notifier);
3947 unregister_pernet_subsys(&packet_net_ops);
3948 sock_unregister(PF_PACKET);
3949 proto_unregister(&packet_proto);
3952 static int __init packet_init(void)
3954 int rc = proto_register(&packet_proto, 0);
3959 sock_register(&packet_family_ops);
3960 register_pernet_subsys(&packet_net_ops);
3961 register_netdevice_notifier(&packet_netdev_notifier);
3966 module_init(packet_init);
3967 module_exit(packet_exit);
3968 MODULE_LICENSE("GPL");
3969 MODULE_ALIAS_NETPROTO(PF_PACKET);