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/uaccess.h>
77 #include <asm/ioctls.h>
79 #include <asm/cacheflush.h>
81 #include <linux/proc_fs.h>
82 #include <linux/seq_file.h>
83 #include <linux/poll.h>
84 #include <linux/module.h>
85 #include <linux/init.h>
86 #include <linux/mutex.h>
87 #include <linux/if_vlan.h>
88 #include <linux/virtio_net.h>
89 #include <linux/errqueue.h>
90 #include <linux/net_tstamp.h>
91 #include <linux/percpu.h>
93 #include <net/inet_common.h>
95 #include <linux/bpf.h>
96 #include <net/compat.h>
102 - if device has no dev->hard_header routine, it adds and removes ll header
103 inside itself. In this case ll header is invisible outside of device,
104 but higher levels still should reserve dev->hard_header_len.
105 Some devices are enough clever to reallocate skb, when header
106 will not fit to reserved space (tunnel), another ones are silly
108 - packet socket receives packets with pulled ll header,
109 so that SOCK_RAW should push it back.
114 Incoming, dev->hard_header!=NULL
115 mac_header -> ll header
118 Outgoing, dev->hard_header!=NULL
119 mac_header -> ll header
122 Incoming, dev->hard_header==NULL
123 mac_header -> UNKNOWN position. It is very likely, that it points to ll
124 header. PPP makes it, that is wrong, because introduce
125 assymetry between rx and tx paths.
128 Outgoing, dev->hard_header==NULL
129 mac_header -> data. ll header is still not built!
133 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
139 dev->hard_header != NULL
140 mac_header -> ll header
143 dev->hard_header == NULL (ll header is added by device, we cannot control it)
147 We should set nh.raw on output to correct posistion,
148 packet classifier depends on it.
151 /* Private packet socket structures. */
153 /* identical to struct packet_mreq except it has
154 * a longer address field.
156 struct packet_mreq_max {
158 unsigned short mr_type;
159 unsigned short mr_alen;
160 unsigned char mr_address[MAX_ADDR_LEN];
164 struct tpacket_hdr *h1;
165 struct tpacket2_hdr *h2;
166 struct tpacket3_hdr *h3;
170 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
171 int closing, int tx_ring);
173 #define V3_ALIGNMENT (8)
175 #define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT))
177 #define BLK_PLUS_PRIV(sz_of_priv) \
178 (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT))
180 #define PGV_FROM_VMALLOC 1
182 #define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status)
183 #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts)
184 #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt)
185 #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len)
186 #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num)
187 #define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
188 #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x)))
191 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
192 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
193 struct packet_type *pt, struct net_device *orig_dev);
195 static void *packet_previous_frame(struct packet_sock *po,
196 struct packet_ring_buffer *rb,
198 static void packet_increment_head(struct packet_ring_buffer *buff);
199 static int prb_curr_blk_in_use(struct tpacket_kbdq_core *,
200 struct tpacket_block_desc *);
201 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *,
202 struct packet_sock *);
203 static void prb_retire_current_block(struct tpacket_kbdq_core *,
204 struct packet_sock *, unsigned int status);
205 static int prb_queue_frozen(struct tpacket_kbdq_core *);
206 static void prb_open_block(struct tpacket_kbdq_core *,
207 struct tpacket_block_desc *);
208 static void prb_retire_rx_blk_timer_expired(unsigned long);
209 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *);
210 static void prb_init_blk_timer(struct packet_sock *,
211 struct tpacket_kbdq_core *,
212 void (*func) (unsigned long));
213 static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *);
214 static void prb_clear_rxhash(struct tpacket_kbdq_core *,
215 struct tpacket3_hdr *);
216 static void prb_fill_vlan_info(struct tpacket_kbdq_core *,
217 struct tpacket3_hdr *);
218 static void packet_flush_mclist(struct sock *sk);
220 struct packet_skb_cb {
222 struct sockaddr_pkt pkt;
224 /* Trick: alias skb original length with
225 * ll.sll_family and ll.protocol in order
228 unsigned int origlen;
229 struct sockaddr_ll ll;
234 #define vio_le() virtio_legacy_is_little_endian()
236 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
238 #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
239 #define GET_PBLOCK_DESC(x, bid) \
240 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
241 #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
242 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
243 #define GET_NEXT_PRB_BLK_NUM(x) \
244 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
245 ((x)->kactive_blk_num+1) : 0)
247 static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
248 static void __fanout_link(struct sock *sk, struct packet_sock *po);
250 static int packet_direct_xmit(struct sk_buff *skb)
252 struct net_device *dev = skb->dev;
253 struct sk_buff *orig_skb = skb;
254 struct netdev_queue *txq;
255 int ret = NETDEV_TX_BUSY;
257 if (unlikely(!netif_running(dev) ||
258 !netif_carrier_ok(dev)))
261 skb = validate_xmit_skb_list(skb, dev);
265 txq = skb_get_tx_queue(dev, skb);
269 HARD_TX_LOCK(dev, txq, smp_processor_id());
270 if (!netif_xmit_frozen_or_drv_stopped(txq))
271 ret = netdev_start_xmit(skb, dev, txq, false);
272 HARD_TX_UNLOCK(dev, txq);
276 if (!dev_xmit_complete(ret))
281 atomic_long_inc(&dev->tx_dropped);
283 return NET_XMIT_DROP;
286 static struct net_device *packet_cached_dev_get(struct packet_sock *po)
288 struct net_device *dev;
291 dev = rcu_dereference(po->cached_dev);
299 static void packet_cached_dev_assign(struct packet_sock *po,
300 struct net_device *dev)
302 rcu_assign_pointer(po->cached_dev, dev);
305 static void packet_cached_dev_reset(struct packet_sock *po)
307 RCU_INIT_POINTER(po->cached_dev, NULL);
310 static bool packet_use_direct_xmit(const struct packet_sock *po)
312 return po->xmit == packet_direct_xmit;
315 static u16 __packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
317 return (u16) raw_smp_processor_id() % dev->real_num_tx_queues;
320 static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
322 const struct net_device_ops *ops = dev->netdev_ops;
325 if (ops->ndo_select_queue) {
326 queue_index = ops->ndo_select_queue(dev, skb, NULL,
327 __packet_pick_tx_queue);
328 queue_index = netdev_cap_txqueue(dev, queue_index);
330 queue_index = __packet_pick_tx_queue(dev, skb);
333 skb_set_queue_mapping(skb, queue_index);
336 /* register_prot_hook must be invoked with the po->bind_lock held,
337 * or from a context in which asynchronous accesses to the packet
338 * socket is not possible (packet_create()).
340 static void register_prot_hook(struct sock *sk)
342 struct packet_sock *po = pkt_sk(sk);
346 __fanout_link(sk, po);
348 dev_add_pack(&po->prot_hook);
355 /* {,__}unregister_prot_hook() must be invoked with the po->bind_lock
356 * held. If the sync parameter is true, we will temporarily drop
357 * the po->bind_lock and do a synchronize_net to make sure no
358 * asynchronous packet processing paths still refer to the elements
359 * of po->prot_hook. If the sync parameter is false, it is the
360 * callers responsibility to take care of this.
362 static void __unregister_prot_hook(struct sock *sk, bool sync)
364 struct packet_sock *po = pkt_sk(sk);
369 __fanout_unlink(sk, po);
371 __dev_remove_pack(&po->prot_hook);
376 spin_unlock(&po->bind_lock);
378 spin_lock(&po->bind_lock);
382 static void unregister_prot_hook(struct sock *sk, bool sync)
384 struct packet_sock *po = pkt_sk(sk);
387 __unregister_prot_hook(sk, sync);
390 static inline struct page * __pure pgv_to_page(void *addr)
392 if (is_vmalloc_addr(addr))
393 return vmalloc_to_page(addr);
394 return virt_to_page(addr);
397 static void __packet_set_status(struct packet_sock *po, void *frame, int status)
399 union tpacket_uhdr h;
402 switch (po->tp_version) {
404 h.h1->tp_status = status;
405 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
408 h.h2->tp_status = status;
409 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
413 WARN(1, "TPACKET version not supported.\n");
420 static int __packet_get_status(struct packet_sock *po, void *frame)
422 union tpacket_uhdr h;
427 switch (po->tp_version) {
429 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
430 return h.h1->tp_status;
432 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
433 return h.h2->tp_status;
436 WARN(1, "TPACKET version not supported.\n");
442 static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts,
445 struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
448 (flags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
449 ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts))
450 return TP_STATUS_TS_RAW_HARDWARE;
452 if (ktime_to_timespec_cond(skb->tstamp, ts))
453 return TP_STATUS_TS_SOFTWARE;
458 static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame,
461 union tpacket_uhdr h;
465 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
469 switch (po->tp_version) {
471 h.h1->tp_sec = ts.tv_sec;
472 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
475 h.h2->tp_sec = ts.tv_sec;
476 h.h2->tp_nsec = ts.tv_nsec;
480 WARN(1, "TPACKET version not supported.\n");
484 /* one flush is safe, as both fields always lie on the same cacheline */
485 flush_dcache_page(pgv_to_page(&h.h1->tp_sec));
491 static void *packet_lookup_frame(struct packet_sock *po,
492 struct packet_ring_buffer *rb,
493 unsigned int position,
496 unsigned int pg_vec_pos, frame_offset;
497 union tpacket_uhdr h;
499 pg_vec_pos = position / rb->frames_per_block;
500 frame_offset = position % rb->frames_per_block;
502 h.raw = rb->pg_vec[pg_vec_pos].buffer +
503 (frame_offset * rb->frame_size);
505 if (status != __packet_get_status(po, h.raw))
511 static void *packet_current_frame(struct packet_sock *po,
512 struct packet_ring_buffer *rb,
515 return packet_lookup_frame(po, rb, rb->head, status);
518 static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc)
520 del_timer_sync(&pkc->retire_blk_timer);
523 static void prb_shutdown_retire_blk_timer(struct packet_sock *po,
524 struct sk_buff_head *rb_queue)
526 struct tpacket_kbdq_core *pkc;
528 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
530 spin_lock_bh(&rb_queue->lock);
531 pkc->delete_blk_timer = 1;
532 spin_unlock_bh(&rb_queue->lock);
534 prb_del_retire_blk_timer(pkc);
537 static void prb_init_blk_timer(struct packet_sock *po,
538 struct tpacket_kbdq_core *pkc,
539 void (*func) (unsigned long))
541 init_timer(&pkc->retire_blk_timer);
542 pkc->retire_blk_timer.data = (long)po;
543 pkc->retire_blk_timer.function = func;
544 pkc->retire_blk_timer.expires = jiffies;
547 static void prb_setup_retire_blk_timer(struct packet_sock *po)
549 struct tpacket_kbdq_core *pkc;
551 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
552 prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired);
555 static int prb_calc_retire_blk_tmo(struct packet_sock *po,
556 int blk_size_in_bytes)
558 struct net_device *dev;
559 unsigned int mbits = 0, msec = 0, div = 0, tmo = 0;
560 struct ethtool_link_ksettings ecmd;
564 dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex);
565 if (unlikely(!dev)) {
567 return DEFAULT_PRB_RETIRE_TOV;
569 err = __ethtool_get_link_ksettings(dev, &ecmd);
573 * If the link speed is so slow you don't really
574 * need to worry about perf anyways
576 if (ecmd.base.speed < SPEED_1000 ||
577 ecmd.base.speed == SPEED_UNKNOWN) {
578 return DEFAULT_PRB_RETIRE_TOV;
581 div = ecmd.base.speed / 1000;
585 mbits = (blk_size_in_bytes * 8) / (1024 * 1024);
597 static void prb_init_ft_ops(struct tpacket_kbdq_core *p1,
598 union tpacket_req_u *req_u)
600 p1->feature_req_word = req_u->req3.tp_feature_req_word;
603 static void init_prb_bdqc(struct packet_sock *po,
604 struct packet_ring_buffer *rb,
606 union tpacket_req_u *req_u)
608 struct tpacket_kbdq_core *p1 = GET_PBDQC_FROM_RB(rb);
609 struct tpacket_block_desc *pbd;
611 memset(p1, 0x0, sizeof(*p1));
613 p1->knxt_seq_num = 1;
615 pbd = (struct tpacket_block_desc *)pg_vec[0].buffer;
616 p1->pkblk_start = pg_vec[0].buffer;
617 p1->kblk_size = req_u->req3.tp_block_size;
618 p1->knum_blocks = req_u->req3.tp_block_nr;
619 p1->hdrlen = po->tp_hdrlen;
620 p1->version = po->tp_version;
621 p1->last_kactive_blk_num = 0;
622 po->stats.stats3.tp_freeze_q_cnt = 0;
623 if (req_u->req3.tp_retire_blk_tov)
624 p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov;
626 p1->retire_blk_tov = prb_calc_retire_blk_tmo(po,
627 req_u->req3.tp_block_size);
628 p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov);
629 p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv;
631 p1->max_frame_len = p1->kblk_size - BLK_PLUS_PRIV(p1->blk_sizeof_priv);
632 prb_init_ft_ops(p1, req_u);
633 prb_setup_retire_blk_timer(po);
634 prb_open_block(p1, pbd);
637 /* Do NOT update the last_blk_num first.
638 * Assumes sk_buff_head lock is held.
640 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc)
642 mod_timer(&pkc->retire_blk_timer,
643 jiffies + pkc->tov_in_jiffies);
644 pkc->last_kactive_blk_num = pkc->kactive_blk_num;
649 * 1) We refresh the timer only when we open a block.
650 * By doing this we don't waste cycles refreshing the timer
651 * on packet-by-packet basis.
653 * With a 1MB block-size, on a 1Gbps line, it will take
654 * i) ~8 ms to fill a block + ii) memcpy etc.
655 * In this cut we are not accounting for the memcpy time.
657 * So, if the user sets the 'tmo' to 10ms then the timer
658 * will never fire while the block is still getting filled
659 * (which is what we want). However, the user could choose
660 * to close a block early and that's fine.
662 * But when the timer does fire, we check whether or not to refresh it.
663 * Since the tmo granularity is in msecs, it is not too expensive
664 * to refresh the timer, lets say every '8' msecs.
665 * Either the user can set the 'tmo' or we can derive it based on
666 * a) line-speed and b) block-size.
667 * prb_calc_retire_blk_tmo() calculates the tmo.
670 static void prb_retire_rx_blk_timer_expired(unsigned long data)
672 struct packet_sock *po = (struct packet_sock *)data;
673 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
675 struct tpacket_block_desc *pbd;
677 spin_lock(&po->sk.sk_receive_queue.lock);
679 frozen = prb_queue_frozen(pkc);
680 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
682 if (unlikely(pkc->delete_blk_timer))
685 /* We only need to plug the race when the block is partially filled.
687 * lock(); increment BLOCK_NUM_PKTS; unlock()
688 * copy_bits() is in progress ...
689 * timer fires on other cpu:
690 * we can't retire the current block because copy_bits
694 if (BLOCK_NUM_PKTS(pbd)) {
695 while (atomic_read(&pkc->blk_fill_in_prog)) {
696 /* Waiting for skb_copy_bits to finish... */
701 if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) {
703 if (!BLOCK_NUM_PKTS(pbd)) {
704 /* An empty block. Just refresh the timer. */
707 prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO);
708 if (!prb_dispatch_next_block(pkc, po))
713 /* Case 1. Queue was frozen because user-space was
716 if (prb_curr_blk_in_use(pkc, pbd)) {
718 * Ok, user-space is still behind.
719 * So just refresh the timer.
723 /* Case 2. queue was frozen,user-space caught up,
724 * now the link went idle && the timer fired.
725 * We don't have a block to close.So we open this
726 * block and restart the timer.
727 * opening a block thaws the queue,restarts timer
728 * Thawing/timer-refresh is a side effect.
730 prb_open_block(pkc, pbd);
737 _prb_refresh_rx_retire_blk_timer(pkc);
740 spin_unlock(&po->sk.sk_receive_queue.lock);
743 static void prb_flush_block(struct tpacket_kbdq_core *pkc1,
744 struct tpacket_block_desc *pbd1, __u32 status)
746 /* Flush everything minus the block header */
748 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
753 /* Skip the block header(we know header WILL fit in 4K) */
756 end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end);
757 for (; start < end; start += PAGE_SIZE)
758 flush_dcache_page(pgv_to_page(start));
763 /* Now update the block status. */
765 BLOCK_STATUS(pbd1) = status;
767 /* Flush the block header */
769 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
771 flush_dcache_page(pgv_to_page(start));
781 * 2) Increment active_blk_num
783 * Note:We DONT refresh the timer on purpose.
784 * Because almost always the next block will be opened.
786 static void prb_close_block(struct tpacket_kbdq_core *pkc1,
787 struct tpacket_block_desc *pbd1,
788 struct packet_sock *po, unsigned int stat)
790 __u32 status = TP_STATUS_USER | stat;
792 struct tpacket3_hdr *last_pkt;
793 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
794 struct sock *sk = &po->sk;
796 if (po->stats.stats3.tp_drops)
797 status |= TP_STATUS_LOSING;
799 last_pkt = (struct tpacket3_hdr *)pkc1->prev;
800 last_pkt->tp_next_offset = 0;
802 /* Get the ts of the last pkt */
803 if (BLOCK_NUM_PKTS(pbd1)) {
804 h1->ts_last_pkt.ts_sec = last_pkt->tp_sec;
805 h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec;
807 /* Ok, we tmo'd - so get the current time.
809 * It shouldn't really happen as we don't close empty
810 * blocks. See prb_retire_rx_blk_timer_expired().
814 h1->ts_last_pkt.ts_sec = ts.tv_sec;
815 h1->ts_last_pkt.ts_nsec = ts.tv_nsec;
820 /* Flush the block */
821 prb_flush_block(pkc1, pbd1, status);
823 sk->sk_data_ready(sk);
825 pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1);
828 static void prb_thaw_queue(struct tpacket_kbdq_core *pkc)
830 pkc->reset_pending_on_curr_blk = 0;
834 * Side effect of opening a block:
836 * 1) prb_queue is thawed.
837 * 2) retire_blk_timer is refreshed.
840 static void prb_open_block(struct tpacket_kbdq_core *pkc1,
841 struct tpacket_block_desc *pbd1)
844 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
848 /* We could have just memset this but we will lose the
849 * flexibility of making the priv area sticky
852 BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++;
853 BLOCK_NUM_PKTS(pbd1) = 0;
854 BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
858 h1->ts_first_pkt.ts_sec = ts.tv_sec;
859 h1->ts_first_pkt.ts_nsec = ts.tv_nsec;
861 pkc1->pkblk_start = (char *)pbd1;
862 pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
864 BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
865 BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN;
867 pbd1->version = pkc1->version;
868 pkc1->prev = pkc1->nxt_offset;
869 pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size;
871 prb_thaw_queue(pkc1);
872 _prb_refresh_rx_retire_blk_timer(pkc1);
878 * Queue freeze logic:
879 * 1) Assume tp_block_nr = 8 blocks.
880 * 2) At time 't0', user opens Rx ring.
881 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
882 * 4) user-space is either sleeping or processing block '0'.
883 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
884 * it will close block-7,loop around and try to fill block '0'.
886 * __packet_lookup_frame_in_block
887 * prb_retire_current_block()
888 * prb_dispatch_next_block()
889 * |->(BLOCK_STATUS == USER) evaluates to true
890 * 5.1) Since block-0 is currently in-use, we just freeze the queue.
891 * 6) Now there are two cases:
892 * 6.1) Link goes idle right after the queue is frozen.
893 * But remember, the last open_block() refreshed the timer.
894 * When this timer expires,it will refresh itself so that we can
895 * re-open block-0 in near future.
896 * 6.2) Link is busy and keeps on receiving packets. This is a simple
897 * case and __packet_lookup_frame_in_block will check if block-0
898 * is free and can now be re-used.
900 static void prb_freeze_queue(struct tpacket_kbdq_core *pkc,
901 struct packet_sock *po)
903 pkc->reset_pending_on_curr_blk = 1;
904 po->stats.stats3.tp_freeze_q_cnt++;
907 #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
910 * If the next block is free then we will dispatch it
911 * and return a good offset.
912 * Else, we will freeze the queue.
913 * So, caller must check the return value.
915 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc,
916 struct packet_sock *po)
918 struct tpacket_block_desc *pbd;
922 /* 1. Get current block num */
923 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
925 /* 2. If this block is currently in_use then freeze the queue */
926 if (TP_STATUS_USER & BLOCK_STATUS(pbd)) {
927 prb_freeze_queue(pkc, po);
933 * open this block and return the offset where the first packet
934 * needs to get stored.
936 prb_open_block(pkc, pbd);
937 return (void *)pkc->nxt_offset;
940 static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
941 struct packet_sock *po, unsigned int status)
943 struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
945 /* retire/close the current block */
946 if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) {
948 * Plug the case where copy_bits() is in progress on
949 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
950 * have space to copy the pkt in the current block and
951 * called prb_retire_current_block()
953 * We don't need to worry about the TMO case because
954 * the timer-handler already handled this case.
956 if (!(status & TP_STATUS_BLK_TMO)) {
957 while (atomic_read(&pkc->blk_fill_in_prog)) {
958 /* Waiting for skb_copy_bits to finish... */
962 prb_close_block(pkc, pbd, po, status);
967 static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc,
968 struct tpacket_block_desc *pbd)
970 return TP_STATUS_USER & BLOCK_STATUS(pbd);
973 static int prb_queue_frozen(struct tpacket_kbdq_core *pkc)
975 return pkc->reset_pending_on_curr_blk;
978 static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb)
980 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
981 atomic_dec(&pkc->blk_fill_in_prog);
984 static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc,
985 struct tpacket3_hdr *ppd)
987 ppd->hv1.tp_rxhash = skb_get_hash(pkc->skb);
990 static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc,
991 struct tpacket3_hdr *ppd)
993 ppd->hv1.tp_rxhash = 0;
996 static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
997 struct tpacket3_hdr *ppd)
999 if (skb_vlan_tag_present(pkc->skb)) {
1000 ppd->hv1.tp_vlan_tci = skb_vlan_tag_get(pkc->skb);
1001 ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->vlan_proto);
1002 ppd->tp_status = TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
1004 ppd->hv1.tp_vlan_tci = 0;
1005 ppd->hv1.tp_vlan_tpid = 0;
1006 ppd->tp_status = TP_STATUS_AVAILABLE;
1010 static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc,
1011 struct tpacket3_hdr *ppd)
1013 ppd->hv1.tp_padding = 0;
1014 prb_fill_vlan_info(pkc, ppd);
1016 if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH)
1017 prb_fill_rxhash(pkc, ppd);
1019 prb_clear_rxhash(pkc, ppd);
1022 static void prb_fill_curr_block(char *curr,
1023 struct tpacket_kbdq_core *pkc,
1024 struct tpacket_block_desc *pbd,
1027 struct tpacket3_hdr *ppd;
1029 ppd = (struct tpacket3_hdr *)curr;
1030 ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len);
1032 pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len);
1033 BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len);
1034 BLOCK_NUM_PKTS(pbd) += 1;
1035 atomic_inc(&pkc->blk_fill_in_prog);
1036 prb_run_all_ft_ops(pkc, ppd);
1039 /* Assumes caller has the sk->rx_queue.lock */
1040 static void *__packet_lookup_frame_in_block(struct packet_sock *po,
1041 struct sk_buff *skb,
1046 struct tpacket_kbdq_core *pkc;
1047 struct tpacket_block_desc *pbd;
1050 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
1051 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1053 /* Queue is frozen when user space is lagging behind */
1054 if (prb_queue_frozen(pkc)) {
1056 * Check if that last block which caused the queue to freeze,
1057 * is still in_use by user-space.
1059 if (prb_curr_blk_in_use(pkc, pbd)) {
1060 /* Can't record this packet */
1064 * Ok, the block was released by user-space.
1065 * Now let's open that block.
1066 * opening a block also thaws the queue.
1067 * Thawing is a side effect.
1069 prb_open_block(pkc, pbd);
1074 curr = pkc->nxt_offset;
1076 end = (char *)pbd + pkc->kblk_size;
1078 /* first try the current block */
1079 if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) {
1080 prb_fill_curr_block(curr, pkc, pbd, len);
1081 return (void *)curr;
1084 /* Ok, close the current block */
1085 prb_retire_current_block(pkc, po, 0);
1087 /* Now, try to dispatch the next block */
1088 curr = (char *)prb_dispatch_next_block(pkc, po);
1090 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1091 prb_fill_curr_block(curr, pkc, pbd, len);
1092 return (void *)curr;
1096 * No free blocks are available.user_space hasn't caught up yet.
1097 * Queue was just frozen and now this packet will get dropped.
1102 static void *packet_current_rx_frame(struct packet_sock *po,
1103 struct sk_buff *skb,
1104 int status, unsigned int len)
1107 switch (po->tp_version) {
1110 curr = packet_lookup_frame(po, &po->rx_ring,
1111 po->rx_ring.head, status);
1114 return __packet_lookup_frame_in_block(po, skb, status, len);
1116 WARN(1, "TPACKET version not supported\n");
1122 static void *prb_lookup_block(struct packet_sock *po,
1123 struct packet_ring_buffer *rb,
1127 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
1128 struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx);
1130 if (status != BLOCK_STATUS(pbd))
1135 static int prb_previous_blk_num(struct packet_ring_buffer *rb)
1138 if (rb->prb_bdqc.kactive_blk_num)
1139 prev = rb->prb_bdqc.kactive_blk_num-1;
1141 prev = rb->prb_bdqc.knum_blocks-1;
1145 /* Assumes caller has held the rx_queue.lock */
1146 static void *__prb_previous_block(struct packet_sock *po,
1147 struct packet_ring_buffer *rb,
1150 unsigned int previous = prb_previous_blk_num(rb);
1151 return prb_lookup_block(po, rb, previous, status);
1154 static void *packet_previous_rx_frame(struct packet_sock *po,
1155 struct packet_ring_buffer *rb,
1158 if (po->tp_version <= TPACKET_V2)
1159 return packet_previous_frame(po, rb, status);
1161 return __prb_previous_block(po, rb, status);
1164 static void packet_increment_rx_head(struct packet_sock *po,
1165 struct packet_ring_buffer *rb)
1167 switch (po->tp_version) {
1170 return packet_increment_head(rb);
1173 WARN(1, "TPACKET version not supported.\n");
1179 static void *packet_previous_frame(struct packet_sock *po,
1180 struct packet_ring_buffer *rb,
1183 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
1184 return packet_lookup_frame(po, rb, previous, status);
1187 static void packet_increment_head(struct packet_ring_buffer *buff)
1189 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
1192 static void packet_inc_pending(struct packet_ring_buffer *rb)
1194 this_cpu_inc(*rb->pending_refcnt);
1197 static void packet_dec_pending(struct packet_ring_buffer *rb)
1199 this_cpu_dec(*rb->pending_refcnt);
1202 static unsigned int packet_read_pending(const struct packet_ring_buffer *rb)
1204 unsigned int refcnt = 0;
1207 /* We don't use pending refcount in rx_ring. */
1208 if (rb->pending_refcnt == NULL)
1211 for_each_possible_cpu(cpu)
1212 refcnt += *per_cpu_ptr(rb->pending_refcnt, cpu);
1217 static int packet_alloc_pending(struct packet_sock *po)
1219 po->rx_ring.pending_refcnt = NULL;
1221 po->tx_ring.pending_refcnt = alloc_percpu(unsigned int);
1222 if (unlikely(po->tx_ring.pending_refcnt == NULL))
1228 static void packet_free_pending(struct packet_sock *po)
1230 free_percpu(po->tx_ring.pending_refcnt);
1233 #define ROOM_POW_OFF 2
1234 #define ROOM_NONE 0x0
1235 #define ROOM_LOW 0x1
1236 #define ROOM_NORMAL 0x2
1238 static bool __tpacket_has_room(struct packet_sock *po, int pow_off)
1242 len = po->rx_ring.frame_max + 1;
1243 idx = po->rx_ring.head;
1245 idx += len >> pow_off;
1248 return packet_lookup_frame(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1251 static bool __tpacket_v3_has_room(struct packet_sock *po, int pow_off)
1255 len = po->rx_ring.prb_bdqc.knum_blocks;
1256 idx = po->rx_ring.prb_bdqc.kactive_blk_num;
1258 idx += len >> pow_off;
1261 return prb_lookup_block(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1264 static int __packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
1266 struct sock *sk = &po->sk;
1267 int ret = ROOM_NONE;
1269 if (po->prot_hook.func != tpacket_rcv) {
1270 int avail = sk->sk_rcvbuf - atomic_read(&sk->sk_rmem_alloc)
1271 - (skb ? skb->truesize : 0);
1272 if (avail > (sk->sk_rcvbuf >> ROOM_POW_OFF))
1280 if (po->tp_version == TPACKET_V3) {
1281 if (__tpacket_v3_has_room(po, ROOM_POW_OFF))
1283 else if (__tpacket_v3_has_room(po, 0))
1286 if (__tpacket_has_room(po, ROOM_POW_OFF))
1288 else if (__tpacket_has_room(po, 0))
1295 static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
1300 spin_lock_bh(&po->sk.sk_receive_queue.lock);
1301 ret = __packet_rcv_has_room(po, skb);
1302 has_room = ret == ROOM_NORMAL;
1303 if (po->pressure == has_room)
1304 po->pressure = !has_room;
1305 spin_unlock_bh(&po->sk.sk_receive_queue.lock);
1310 static void packet_sock_destruct(struct sock *sk)
1312 skb_queue_purge(&sk->sk_error_queue);
1314 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
1315 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
1317 if (!sock_flag(sk, SOCK_DEAD)) {
1318 pr_err("Attempt to release alive packet socket: %p\n", sk);
1322 sk_refcnt_debug_dec(sk);
1325 static bool fanout_flow_is_huge(struct packet_sock *po, struct sk_buff *skb)
1330 rxhash = skb_get_hash(skb);
1331 for (i = 0; i < ROLLOVER_HLEN; i++)
1332 if (po->rollover->history[i] == rxhash)
1335 po->rollover->history[prandom_u32() % ROLLOVER_HLEN] = rxhash;
1336 return count > (ROLLOVER_HLEN >> 1);
1339 static unsigned int fanout_demux_hash(struct packet_fanout *f,
1340 struct sk_buff *skb,
1343 return reciprocal_scale(__skb_get_hash_symmetric(skb), num);
1346 static unsigned int fanout_demux_lb(struct packet_fanout *f,
1347 struct sk_buff *skb,
1350 unsigned int val = atomic_inc_return(&f->rr_cur);
1355 static unsigned int fanout_demux_cpu(struct packet_fanout *f,
1356 struct sk_buff *skb,
1359 return smp_processor_id() % num;
1362 static unsigned int fanout_demux_rnd(struct packet_fanout *f,
1363 struct sk_buff *skb,
1366 return prandom_u32_max(num);
1369 static unsigned int fanout_demux_rollover(struct packet_fanout *f,
1370 struct sk_buff *skb,
1371 unsigned int idx, bool try_self,
1374 struct packet_sock *po, *po_next, *po_skip = NULL;
1375 unsigned int i, j, room = ROOM_NONE;
1377 po = pkt_sk(f->arr[idx]);
1380 room = packet_rcv_has_room(po, skb);
1381 if (room == ROOM_NORMAL ||
1382 (room == ROOM_LOW && !fanout_flow_is_huge(po, skb)))
1387 i = j = min_t(int, po->rollover->sock, num - 1);
1389 po_next = pkt_sk(f->arr[i]);
1390 if (po_next != po_skip && !po_next->pressure &&
1391 packet_rcv_has_room(po_next, skb) == ROOM_NORMAL) {
1393 po->rollover->sock = i;
1394 atomic_long_inc(&po->rollover->num);
1395 if (room == ROOM_LOW)
1396 atomic_long_inc(&po->rollover->num_huge);
1404 atomic_long_inc(&po->rollover->num_failed);
1408 static unsigned int fanout_demux_qm(struct packet_fanout *f,
1409 struct sk_buff *skb,
1412 return skb_get_queue_mapping(skb) % num;
1415 static unsigned int fanout_demux_bpf(struct packet_fanout *f,
1416 struct sk_buff *skb,
1419 struct bpf_prog *prog;
1420 unsigned int ret = 0;
1423 prog = rcu_dereference(f->bpf_prog);
1425 ret = bpf_prog_run_clear_cb(prog, skb) % num;
1431 static bool fanout_has_flag(struct packet_fanout *f, u16 flag)
1433 return f->flags & (flag >> 8);
1436 static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
1437 struct packet_type *pt, struct net_device *orig_dev)
1439 struct packet_fanout *f = pt->af_packet_priv;
1440 unsigned int num = READ_ONCE(f->num_members);
1441 struct net *net = read_pnet(&f->net);
1442 struct packet_sock *po;
1445 if (!net_eq(dev_net(dev), net) || !num) {
1450 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) {
1451 skb = ip_check_defrag(net, skb, IP_DEFRAG_AF_PACKET);
1456 case PACKET_FANOUT_HASH:
1458 idx = fanout_demux_hash(f, skb, num);
1460 case PACKET_FANOUT_LB:
1461 idx = fanout_demux_lb(f, skb, num);
1463 case PACKET_FANOUT_CPU:
1464 idx = fanout_demux_cpu(f, skb, num);
1466 case PACKET_FANOUT_RND:
1467 idx = fanout_demux_rnd(f, skb, num);
1469 case PACKET_FANOUT_QM:
1470 idx = fanout_demux_qm(f, skb, num);
1472 case PACKET_FANOUT_ROLLOVER:
1473 idx = fanout_demux_rollover(f, skb, 0, false, num);
1475 case PACKET_FANOUT_CBPF:
1476 case PACKET_FANOUT_EBPF:
1477 idx = fanout_demux_bpf(f, skb, num);
1481 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER))
1482 idx = fanout_demux_rollover(f, skb, idx, true, num);
1484 po = pkt_sk(f->arr[idx]);
1485 return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
1488 DEFINE_MUTEX(fanout_mutex);
1489 EXPORT_SYMBOL_GPL(fanout_mutex);
1490 static LIST_HEAD(fanout_list);
1492 static void __fanout_link(struct sock *sk, struct packet_sock *po)
1494 struct packet_fanout *f = po->fanout;
1496 spin_lock(&f->lock);
1497 f->arr[f->num_members] = sk;
1500 spin_unlock(&f->lock);
1503 static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
1505 struct packet_fanout *f = po->fanout;
1508 spin_lock(&f->lock);
1509 for (i = 0; i < f->num_members; i++) {
1510 if (f->arr[i] == sk)
1513 BUG_ON(i >= f->num_members);
1514 f->arr[i] = f->arr[f->num_members - 1];
1516 spin_unlock(&f->lock);
1519 static bool match_fanout_group(struct packet_type *ptype, struct sock *sk)
1521 if (sk->sk_family != PF_PACKET)
1524 return ptype->af_packet_priv == pkt_sk(sk)->fanout;
1527 static void fanout_init_data(struct packet_fanout *f)
1530 case PACKET_FANOUT_LB:
1531 atomic_set(&f->rr_cur, 0);
1533 case PACKET_FANOUT_CBPF:
1534 case PACKET_FANOUT_EBPF:
1535 RCU_INIT_POINTER(f->bpf_prog, NULL);
1540 static void __fanout_set_data_bpf(struct packet_fanout *f, struct bpf_prog *new)
1542 struct bpf_prog *old;
1544 spin_lock(&f->lock);
1545 old = rcu_dereference_protected(f->bpf_prog, lockdep_is_held(&f->lock));
1546 rcu_assign_pointer(f->bpf_prog, new);
1547 spin_unlock(&f->lock);
1551 bpf_prog_destroy(old);
1555 static int fanout_set_data_cbpf(struct packet_sock *po, char __user *data,
1558 struct bpf_prog *new;
1559 struct sock_fprog fprog;
1562 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1564 if (len != sizeof(fprog))
1566 if (copy_from_user(&fprog, data, len))
1569 ret = bpf_prog_create_from_user(&new, &fprog, NULL, false);
1573 __fanout_set_data_bpf(po->fanout, new);
1577 static int fanout_set_data_ebpf(struct packet_sock *po, char __user *data,
1580 struct bpf_prog *new;
1583 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1585 if (len != sizeof(fd))
1587 if (copy_from_user(&fd, data, len))
1590 new = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER);
1592 return PTR_ERR(new);
1594 __fanout_set_data_bpf(po->fanout, new);
1598 static int fanout_set_data(struct packet_sock *po, char __user *data,
1601 switch (po->fanout->type) {
1602 case PACKET_FANOUT_CBPF:
1603 return fanout_set_data_cbpf(po, data, len);
1604 case PACKET_FANOUT_EBPF:
1605 return fanout_set_data_ebpf(po, data, len);
1611 static void fanout_release_data(struct packet_fanout *f)
1614 case PACKET_FANOUT_CBPF:
1615 case PACKET_FANOUT_EBPF:
1616 __fanout_set_data_bpf(f, NULL);
1620 static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
1622 struct packet_sock *po = pkt_sk(sk);
1623 struct packet_fanout *f, *match;
1624 u8 type = type_flags & 0xff;
1625 u8 flags = type_flags >> 8;
1629 case PACKET_FANOUT_ROLLOVER:
1630 if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)
1632 case PACKET_FANOUT_HASH:
1633 case PACKET_FANOUT_LB:
1634 case PACKET_FANOUT_CPU:
1635 case PACKET_FANOUT_RND:
1636 case PACKET_FANOUT_QM:
1637 case PACKET_FANOUT_CBPF:
1638 case PACKET_FANOUT_EBPF:
1650 if (type == PACKET_FANOUT_ROLLOVER ||
1651 (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) {
1652 po->rollover = kzalloc(sizeof(*po->rollover), GFP_KERNEL);
1655 atomic_long_set(&po->rollover->num, 0);
1656 atomic_long_set(&po->rollover->num_huge, 0);
1657 atomic_long_set(&po->rollover->num_failed, 0);
1660 mutex_lock(&fanout_mutex);
1662 list_for_each_entry(f, &fanout_list, list) {
1664 read_pnet(&f->net) == sock_net(sk)) {
1670 if (match && match->flags != flags)
1674 match = kzalloc(sizeof(*match), GFP_KERNEL);
1677 write_pnet(&match->net, sock_net(sk));
1680 match->flags = flags;
1681 INIT_LIST_HEAD(&match->list);
1682 spin_lock_init(&match->lock);
1683 atomic_set(&match->sk_ref, 0);
1684 fanout_init_data(match);
1685 match->prot_hook.type = po->prot_hook.type;
1686 match->prot_hook.dev = po->prot_hook.dev;
1687 match->prot_hook.func = packet_rcv_fanout;
1688 match->prot_hook.af_packet_priv = match;
1689 match->prot_hook.id_match = match_fanout_group;
1690 dev_add_pack(&match->prot_hook);
1691 list_add(&match->list, &fanout_list);
1694 if (match->type == type &&
1695 match->prot_hook.type == po->prot_hook.type &&
1696 match->prot_hook.dev == po->prot_hook.dev) {
1698 if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
1699 __dev_remove_pack(&po->prot_hook);
1701 atomic_inc(&match->sk_ref);
1702 __fanout_link(sk, po);
1707 mutex_unlock(&fanout_mutex);
1709 kfree(po->rollover);
1710 po->rollover = NULL;
1715 static void fanout_release(struct sock *sk)
1717 struct packet_sock *po = pkt_sk(sk);
1718 struct packet_fanout *f;
1724 mutex_lock(&fanout_mutex);
1727 if (atomic_dec_and_test(&f->sk_ref)) {
1729 dev_remove_pack(&f->prot_hook);
1730 fanout_release_data(f);
1733 mutex_unlock(&fanout_mutex);
1736 kfree_rcu(po->rollover, rcu);
1739 static bool packet_extra_vlan_len_allowed(const struct net_device *dev,
1740 struct sk_buff *skb)
1742 /* Earlier code assumed this would be a VLAN pkt, double-check
1743 * this now that we have the actual packet in hand. We can only
1744 * do this check on Ethernet devices.
1746 if (unlikely(dev->type != ARPHRD_ETHER))
1749 skb_reset_mac_header(skb);
1750 return likely(eth_hdr(skb)->h_proto == htons(ETH_P_8021Q));
1753 static const struct proto_ops packet_ops;
1755 static const struct proto_ops packet_ops_spkt;
1757 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
1758 struct packet_type *pt, struct net_device *orig_dev)
1761 struct sockaddr_pkt *spkt;
1764 * When we registered the protocol we saved the socket in the data
1765 * field for just this event.
1768 sk = pt->af_packet_priv;
1771 * Yank back the headers [hope the device set this
1772 * right or kerboom...]
1774 * Incoming packets have ll header pulled,
1777 * For outgoing ones skb->data == skb_mac_header(skb)
1778 * so that this procedure is noop.
1781 if (skb->pkt_type == PACKET_LOOPBACK)
1784 if (!net_eq(dev_net(dev), sock_net(sk)))
1787 skb = skb_share_check(skb, GFP_ATOMIC);
1791 /* drop any routing info */
1794 /* drop conntrack reference */
1797 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
1799 skb_push(skb, skb->data - skb_mac_header(skb));
1802 * The SOCK_PACKET socket receives _all_ frames.
1805 spkt->spkt_family = dev->type;
1806 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
1807 spkt->spkt_protocol = skb->protocol;
1810 * Charge the memory to the socket. This is done specifically
1811 * to prevent sockets using all the memory up.
1814 if (sock_queue_rcv_skb(sk, skb) == 0)
1825 * Output a raw packet to a device layer. This bypasses all the other
1826 * protocol layers and you must therefore supply it with a complete frame
1829 static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg,
1832 struct sock *sk = sock->sk;
1833 DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name);
1834 struct sk_buff *skb = NULL;
1835 struct net_device *dev;
1836 struct sockcm_cookie sockc;
1842 * Get and verify the address.
1846 if (msg->msg_namelen < sizeof(struct sockaddr))
1848 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
1849 proto = saddr->spkt_protocol;
1851 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
1854 * Find the device first to size check it
1857 saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0;
1860 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
1866 if (!(dev->flags & IFF_UP))
1870 * You may not queue a frame bigger than the mtu. This is the lowest level
1871 * raw protocol and you must do your own fragmentation at this level.
1874 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
1875 if (!netif_supports_nofcs(dev)) {
1876 err = -EPROTONOSUPPORT;
1879 extra_len = 4; /* We're doing our own CRC */
1883 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len)
1887 size_t reserved = LL_RESERVED_SPACE(dev);
1888 int tlen = dev->needed_tailroom;
1889 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
1892 skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL);
1895 /* FIXME: Save some space for broken drivers that write a hard
1896 * header at transmission time by themselves. PPP is the notable
1897 * one here. This should really be fixed at the driver level.
1899 skb_reserve(skb, reserved);
1900 skb_reset_network_header(skb);
1902 /* Try to align data part correctly */
1907 skb_reset_network_header(skb);
1909 err = memcpy_from_msg(skb_put(skb, len), msg, len);
1915 if (!dev_validate_header(dev, skb->data, len)) {
1919 if (len > (dev->mtu + dev->hard_header_len + extra_len) &&
1920 !packet_extra_vlan_len_allowed(dev, skb)) {
1925 sockc.tsflags = sk->sk_tsflags;
1926 if (msg->msg_controllen) {
1927 err = sock_cmsg_send(sk, msg, &sockc);
1932 skb->protocol = proto;
1934 skb->priority = sk->sk_priority;
1935 skb->mark = sk->sk_mark;
1937 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
1939 if (unlikely(extra_len == 4))
1942 skb_probe_transport_header(skb, 0);
1944 dev_queue_xmit(skb);
1955 static unsigned int run_filter(struct sk_buff *skb,
1956 const struct sock *sk,
1959 struct sk_filter *filter;
1962 filter = rcu_dereference(sk->sk_filter);
1964 res = bpf_prog_run_clear_cb(filter->prog, skb);
1970 static int __packet_rcv_vnet(const struct sk_buff *skb,
1971 struct virtio_net_hdr *vnet_hdr)
1973 *vnet_hdr = (const struct virtio_net_hdr) { 0 };
1975 if (virtio_net_hdr_from_skb(skb, vnet_hdr, vio_le()))
1981 static int packet_rcv_vnet(struct msghdr *msg, const struct sk_buff *skb,
1984 struct virtio_net_hdr vnet_hdr;
1986 if (*len < sizeof(vnet_hdr))
1988 *len -= sizeof(vnet_hdr);
1990 if (__packet_rcv_vnet(skb, &vnet_hdr))
1993 return memcpy_to_msg(msg, (void *)&vnet_hdr, sizeof(vnet_hdr));
1997 * This function makes lazy skb cloning in hope that most of packets
1998 * are discarded by BPF.
2000 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
2001 * and skb->cb are mangled. It works because (and until) packets
2002 * falling here are owned by current CPU. Output packets are cloned
2003 * by dev_queue_xmit_nit(), input packets are processed by net_bh
2004 * sequencially, so that if we return skb to original state on exit,
2005 * we will not harm anyone.
2008 static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
2009 struct packet_type *pt, struct net_device *orig_dev)
2012 struct sockaddr_ll *sll;
2013 struct packet_sock *po;
2014 u8 *skb_head = skb->data;
2015 int skb_len = skb->len;
2016 unsigned int snaplen, res;
2017 bool is_drop_n_account = false;
2019 if (skb->pkt_type == PACKET_LOOPBACK)
2022 sk = pt->af_packet_priv;
2025 if (!net_eq(dev_net(dev), sock_net(sk)))
2030 if (dev->header_ops) {
2031 /* The device has an explicit notion of ll header,
2032 * exported to higher levels.
2034 * Otherwise, the device hides details of its frame
2035 * structure, so that corresponding packet head is
2036 * never delivered to user.
2038 if (sk->sk_type != SOCK_DGRAM)
2039 skb_push(skb, skb->data - skb_mac_header(skb));
2040 else if (skb->pkt_type == PACKET_OUTGOING) {
2041 /* Special case: outgoing packets have ll header at head */
2042 skb_pull(skb, skb_network_offset(skb));
2048 res = run_filter(skb, sk, snaplen);
2050 goto drop_n_restore;
2054 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
2057 if (skb_shared(skb)) {
2058 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
2062 if (skb_head != skb->data) {
2063 skb->data = skb_head;
2070 sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8);
2072 sll = &PACKET_SKB_CB(skb)->sa.ll;
2073 sll->sll_hatype = dev->type;
2074 sll->sll_pkttype = skb->pkt_type;
2075 if (unlikely(po->origdev))
2076 sll->sll_ifindex = orig_dev->ifindex;
2078 sll->sll_ifindex = dev->ifindex;
2080 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2082 /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg().
2083 * Use their space for storing the original skb length.
2085 PACKET_SKB_CB(skb)->sa.origlen = skb->len;
2087 if (pskb_trim(skb, snaplen))
2090 skb_set_owner_r(skb, sk);
2094 /* drop conntrack reference */
2097 spin_lock(&sk->sk_receive_queue.lock);
2098 po->stats.stats1.tp_packets++;
2099 sock_skb_set_dropcount(sk, skb);
2100 __skb_queue_tail(&sk->sk_receive_queue, skb);
2101 spin_unlock(&sk->sk_receive_queue.lock);
2102 sk->sk_data_ready(sk);
2106 is_drop_n_account = true;
2107 spin_lock(&sk->sk_receive_queue.lock);
2108 po->stats.stats1.tp_drops++;
2109 atomic_inc(&sk->sk_drops);
2110 spin_unlock(&sk->sk_receive_queue.lock);
2113 if (skb_head != skb->data && skb_shared(skb)) {
2114 skb->data = skb_head;
2118 if (!is_drop_n_account)
2125 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
2126 struct packet_type *pt, struct net_device *orig_dev)
2129 struct packet_sock *po;
2130 struct sockaddr_ll *sll;
2131 union tpacket_uhdr h;
2132 u8 *skb_head = skb->data;
2133 int skb_len = skb->len;
2134 unsigned int snaplen, res;
2135 unsigned long status = TP_STATUS_USER;
2136 unsigned short macoff, netoff, hdrlen;
2137 struct sk_buff *copy_skb = NULL;
2140 bool is_drop_n_account = false;
2142 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
2143 * We may add members to them until current aligned size without forcing
2144 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
2146 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
2147 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
2149 if (skb->pkt_type == PACKET_LOOPBACK)
2152 sk = pt->af_packet_priv;
2155 if (!net_eq(dev_net(dev), sock_net(sk)))
2158 if (dev->header_ops) {
2159 if (sk->sk_type != SOCK_DGRAM)
2160 skb_push(skb, skb->data - skb_mac_header(skb));
2161 else if (skb->pkt_type == PACKET_OUTGOING) {
2162 /* Special case: outgoing packets have ll header at head */
2163 skb_pull(skb, skb_network_offset(skb));
2169 res = run_filter(skb, sk, snaplen);
2171 goto drop_n_restore;
2173 if (skb->ip_summed == CHECKSUM_PARTIAL)
2174 status |= TP_STATUS_CSUMNOTREADY;
2175 else if (skb->pkt_type != PACKET_OUTGOING &&
2176 (skb->ip_summed == CHECKSUM_COMPLETE ||
2177 skb_csum_unnecessary(skb)))
2178 status |= TP_STATUS_CSUM_VALID;
2183 if (sk->sk_type == SOCK_DGRAM) {
2184 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
2187 unsigned int maclen = skb_network_offset(skb);
2188 netoff = TPACKET_ALIGN(po->tp_hdrlen +
2189 (maclen < 16 ? 16 : maclen)) +
2191 if (po->has_vnet_hdr)
2192 netoff += sizeof(struct virtio_net_hdr);
2193 macoff = netoff - maclen;
2195 if (po->tp_version <= TPACKET_V2) {
2196 if (macoff + snaplen > po->rx_ring.frame_size) {
2197 if (po->copy_thresh &&
2198 atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
2199 if (skb_shared(skb)) {
2200 copy_skb = skb_clone(skb, GFP_ATOMIC);
2202 copy_skb = skb_get(skb);
2203 skb_head = skb->data;
2206 skb_set_owner_r(copy_skb, sk);
2208 snaplen = po->rx_ring.frame_size - macoff;
2209 if ((int)snaplen < 0)
2212 } else if (unlikely(macoff + snaplen >
2213 GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) {
2216 nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff;
2217 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
2218 snaplen, nval, macoff);
2220 if (unlikely((int)snaplen < 0)) {
2222 macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len;
2225 spin_lock(&sk->sk_receive_queue.lock);
2226 h.raw = packet_current_rx_frame(po, skb,
2227 TP_STATUS_KERNEL, (macoff+snaplen));
2229 goto drop_n_account;
2230 if (po->tp_version <= TPACKET_V2) {
2231 packet_increment_rx_head(po, &po->rx_ring);
2233 * LOSING will be reported till you read the stats,
2234 * because it's COR - Clear On Read.
2235 * Anyways, moving it for V1/V2 only as V3 doesn't need this
2238 if (po->stats.stats1.tp_drops)
2239 status |= TP_STATUS_LOSING;
2241 po->stats.stats1.tp_packets++;
2243 status |= TP_STATUS_COPY;
2244 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
2246 spin_unlock(&sk->sk_receive_queue.lock);
2248 if (po->has_vnet_hdr) {
2249 if (__packet_rcv_vnet(skb, h.raw + macoff -
2250 sizeof(struct virtio_net_hdr))) {
2251 spin_lock(&sk->sk_receive_queue.lock);
2252 goto drop_n_account;
2256 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
2258 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
2259 getnstimeofday(&ts);
2261 status |= ts_status;
2263 switch (po->tp_version) {
2265 h.h1->tp_len = skb->len;
2266 h.h1->tp_snaplen = snaplen;
2267 h.h1->tp_mac = macoff;
2268 h.h1->tp_net = netoff;
2269 h.h1->tp_sec = ts.tv_sec;
2270 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
2271 hdrlen = sizeof(*h.h1);
2274 h.h2->tp_len = skb->len;
2275 h.h2->tp_snaplen = snaplen;
2276 h.h2->tp_mac = macoff;
2277 h.h2->tp_net = netoff;
2278 h.h2->tp_sec = ts.tv_sec;
2279 h.h2->tp_nsec = ts.tv_nsec;
2280 if (skb_vlan_tag_present(skb)) {
2281 h.h2->tp_vlan_tci = skb_vlan_tag_get(skb);
2282 h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto);
2283 status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
2285 h.h2->tp_vlan_tci = 0;
2286 h.h2->tp_vlan_tpid = 0;
2288 memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding));
2289 hdrlen = sizeof(*h.h2);
2292 /* tp_nxt_offset,vlan are already populated above.
2293 * So DONT clear those fields here
2295 h.h3->tp_status |= status;
2296 h.h3->tp_len = skb->len;
2297 h.h3->tp_snaplen = snaplen;
2298 h.h3->tp_mac = macoff;
2299 h.h3->tp_net = netoff;
2300 h.h3->tp_sec = ts.tv_sec;
2301 h.h3->tp_nsec = ts.tv_nsec;
2302 memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding));
2303 hdrlen = sizeof(*h.h3);
2309 sll = h.raw + TPACKET_ALIGN(hdrlen);
2310 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2311 sll->sll_family = AF_PACKET;
2312 sll->sll_hatype = dev->type;
2313 sll->sll_protocol = skb->protocol;
2314 sll->sll_pkttype = skb->pkt_type;
2315 if (unlikely(po->origdev))
2316 sll->sll_ifindex = orig_dev->ifindex;
2318 sll->sll_ifindex = dev->ifindex;
2322 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
2323 if (po->tp_version <= TPACKET_V2) {
2326 end = (u8 *) PAGE_ALIGN((unsigned long) h.raw +
2329 for (start = h.raw; start < end; start += PAGE_SIZE)
2330 flush_dcache_page(pgv_to_page(start));
2335 if (po->tp_version <= TPACKET_V2) {
2336 __packet_set_status(po, h.raw, status);
2337 sk->sk_data_ready(sk);
2339 prb_clear_blk_fill_status(&po->rx_ring);
2343 if (skb_head != skb->data && skb_shared(skb)) {
2344 skb->data = skb_head;
2348 if (!is_drop_n_account)
2355 is_drop_n_account = true;
2356 po->stats.stats1.tp_drops++;
2357 spin_unlock(&sk->sk_receive_queue.lock);
2359 sk->sk_data_ready(sk);
2360 kfree_skb(copy_skb);
2361 goto drop_n_restore;
2364 static void tpacket_destruct_skb(struct sk_buff *skb)
2366 struct packet_sock *po = pkt_sk(skb->sk);
2368 if (likely(po->tx_ring.pg_vec)) {
2372 ph = skb_shinfo(skb)->destructor_arg;
2373 packet_dec_pending(&po->tx_ring);
2375 ts = __packet_set_timestamp(po, ph, skb);
2376 __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts);
2382 static void tpacket_set_protocol(const struct net_device *dev,
2383 struct sk_buff *skb)
2385 if (dev->type == ARPHRD_ETHER) {
2386 skb_reset_mac_header(skb);
2387 skb->protocol = eth_hdr(skb)->h_proto;
2391 static int __packet_snd_vnet_parse(struct virtio_net_hdr *vnet_hdr, size_t len)
2393 unsigned short gso_type = 0;
2395 if ((vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
2396 (__virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2397 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2 >
2398 __virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len)))
2399 vnet_hdr->hdr_len = __cpu_to_virtio16(vio_le(),
2400 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2401 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2);
2403 if (__virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len) > len)
2406 if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2407 switch (vnet_hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2408 case VIRTIO_NET_HDR_GSO_TCPV4:
2409 gso_type = SKB_GSO_TCPV4;
2411 case VIRTIO_NET_HDR_GSO_TCPV6:
2412 gso_type = SKB_GSO_TCPV6;
2414 case VIRTIO_NET_HDR_GSO_UDP:
2415 gso_type = SKB_GSO_UDP;
2421 if (vnet_hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
2422 gso_type |= SKB_GSO_TCP_ECN;
2424 if (vnet_hdr->gso_size == 0)
2428 vnet_hdr->gso_type = gso_type; /* changes type, temporary storage */
2432 static int packet_snd_vnet_parse(struct msghdr *msg, size_t *len,
2433 struct virtio_net_hdr *vnet_hdr)
2437 if (*len < sizeof(*vnet_hdr))
2439 *len -= sizeof(*vnet_hdr);
2441 n = copy_from_iter(vnet_hdr, sizeof(*vnet_hdr), &msg->msg_iter);
2442 if (n != sizeof(*vnet_hdr))
2445 return __packet_snd_vnet_parse(vnet_hdr, *len);
2448 static int packet_snd_vnet_gso(struct sk_buff *skb,
2449 struct virtio_net_hdr *vnet_hdr)
2451 if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
2452 u16 s = __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start);
2453 u16 o = __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset);
2455 if (!skb_partial_csum_set(skb, s, o))
2459 skb_shinfo(skb)->gso_size =
2460 __virtio16_to_cpu(vio_le(), vnet_hdr->gso_size);
2461 skb_shinfo(skb)->gso_type = vnet_hdr->gso_type;
2463 /* Header must be checked, and gso_segs computed. */
2464 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2465 skb_shinfo(skb)->gso_segs = 0;
2469 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
2470 void *frame, struct net_device *dev, void *data, int tp_len,
2471 __be16 proto, unsigned char *addr, int hlen, int copylen,
2472 const struct sockcm_cookie *sockc)
2474 union tpacket_uhdr ph;
2475 int to_write, offset, len, nr_frags, len_max;
2476 struct socket *sock = po->sk.sk_socket;
2482 skb->protocol = proto;
2484 skb->priority = po->sk.sk_priority;
2485 skb->mark = po->sk.sk_mark;
2486 sock_tx_timestamp(&po->sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags);
2487 skb_shinfo(skb)->destructor_arg = ph.raw;
2489 skb_reserve(skb, hlen);
2490 skb_reset_network_header(skb);
2494 if (sock->type == SOCK_DGRAM) {
2495 err = dev_hard_header(skb, dev, ntohs(proto), addr,
2497 if (unlikely(err < 0))
2499 } else if (copylen) {
2500 int hdrlen = min_t(int, copylen, tp_len);
2502 skb_push(skb, dev->hard_header_len);
2503 skb_put(skb, copylen - dev->hard_header_len);
2504 err = skb_store_bits(skb, 0, data, hdrlen);
2507 if (!dev_validate_header(dev, skb->data, hdrlen))
2510 tpacket_set_protocol(dev, skb);
2516 offset = offset_in_page(data);
2517 len_max = PAGE_SIZE - offset;
2518 len = ((to_write > len_max) ? len_max : to_write);
2520 skb->data_len = to_write;
2521 skb->len += to_write;
2522 skb->truesize += to_write;
2523 atomic_add(to_write, &po->sk.sk_wmem_alloc);
2525 while (likely(to_write)) {
2526 nr_frags = skb_shinfo(skb)->nr_frags;
2528 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
2529 pr_err("Packet exceed the number of skb frags(%lu)\n",
2534 page = pgv_to_page(data);
2536 flush_dcache_page(page);
2538 skb_fill_page_desc(skb, nr_frags, page, offset, len);
2541 len_max = PAGE_SIZE;
2542 len = ((to_write > len_max) ? len_max : to_write);
2545 skb_probe_transport_header(skb, 0);
2550 static int tpacket_parse_header(struct packet_sock *po, void *frame,
2551 int size_max, void **data)
2553 union tpacket_uhdr ph;
2558 switch (po->tp_version) {
2560 tp_len = ph.h2->tp_len;
2563 tp_len = ph.h1->tp_len;
2566 if (unlikely(tp_len > size_max)) {
2567 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
2571 if (unlikely(po->tp_tx_has_off)) {
2572 int off_min, off_max;
2574 off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2575 off_max = po->tx_ring.frame_size - tp_len;
2576 if (po->sk.sk_type == SOCK_DGRAM) {
2577 switch (po->tp_version) {
2579 off = ph.h2->tp_net;
2582 off = ph.h1->tp_net;
2586 switch (po->tp_version) {
2588 off = ph.h2->tp_mac;
2591 off = ph.h1->tp_mac;
2595 if (unlikely((off < off_min) || (off_max < off)))
2598 off = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2601 *data = frame + off;
2605 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
2607 struct sk_buff *skb;
2608 struct net_device *dev;
2609 struct virtio_net_hdr *vnet_hdr = NULL;
2610 struct sockcm_cookie sockc;
2612 int err, reserve = 0;
2614 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2615 bool need_wait = !(msg->msg_flags & MSG_DONTWAIT);
2616 int tp_len, size_max;
2617 unsigned char *addr;
2620 int status = TP_STATUS_AVAILABLE;
2621 int hlen, tlen, copylen = 0;
2623 mutex_lock(&po->pg_vec_lock);
2625 if (likely(saddr == NULL)) {
2626 dev = packet_cached_dev_get(po);
2631 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2633 if (msg->msg_namelen < (saddr->sll_halen
2634 + offsetof(struct sockaddr_ll,
2637 proto = saddr->sll_protocol;
2638 addr = saddr->sll_addr;
2639 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
2642 sockc.tsflags = po->sk.sk_tsflags;
2643 if (msg->msg_controllen) {
2644 err = sock_cmsg_send(&po->sk, msg, &sockc);
2650 if (unlikely(dev == NULL))
2653 if (unlikely(!(dev->flags & IFF_UP)))
2656 if (po->sk.sk_socket->type == SOCK_RAW)
2657 reserve = dev->hard_header_len;
2658 size_max = po->tx_ring.frame_size
2659 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
2661 if ((size_max > dev->mtu + reserve + VLAN_HLEN) && !po->has_vnet_hdr)
2662 size_max = dev->mtu + reserve + VLAN_HLEN;
2665 ph = packet_current_frame(po, &po->tx_ring,
2666 TP_STATUS_SEND_REQUEST);
2667 if (unlikely(ph == NULL)) {
2668 if (need_wait && need_resched())
2674 tp_len = tpacket_parse_header(po, ph, size_max, &data);
2678 status = TP_STATUS_SEND_REQUEST;
2679 hlen = LL_RESERVED_SPACE(dev);
2680 tlen = dev->needed_tailroom;
2681 if (po->has_vnet_hdr) {
2683 data += sizeof(*vnet_hdr);
2684 tp_len -= sizeof(*vnet_hdr);
2686 __packet_snd_vnet_parse(vnet_hdr, tp_len)) {
2690 copylen = __virtio16_to_cpu(vio_le(),
2693 copylen = max_t(int, copylen, dev->hard_header_len);
2694 skb = sock_alloc_send_skb(&po->sk,
2695 hlen + tlen + sizeof(struct sockaddr_ll) +
2696 (copylen - dev->hard_header_len),
2699 if (unlikely(skb == NULL)) {
2700 /* we assume the socket was initially writeable ... */
2701 if (likely(len_sum > 0))
2705 tp_len = tpacket_fill_skb(po, skb, ph, dev, data, tp_len, proto,
2706 addr, hlen, copylen, &sockc);
2707 if (likely(tp_len >= 0) &&
2708 tp_len > dev->mtu + reserve &&
2709 !po->has_vnet_hdr &&
2710 !packet_extra_vlan_len_allowed(dev, skb))
2713 if (unlikely(tp_len < 0)) {
2716 __packet_set_status(po, ph,
2717 TP_STATUS_AVAILABLE);
2718 packet_increment_head(&po->tx_ring);
2722 status = TP_STATUS_WRONG_FORMAT;
2728 if (po->has_vnet_hdr && packet_snd_vnet_gso(skb, vnet_hdr)) {
2733 packet_pick_tx_queue(dev, skb);
2735 skb->destructor = tpacket_destruct_skb;
2736 __packet_set_status(po, ph, TP_STATUS_SENDING);
2737 packet_inc_pending(&po->tx_ring);
2739 status = TP_STATUS_SEND_REQUEST;
2740 err = po->xmit(skb);
2741 if (unlikely(err > 0)) {
2742 err = net_xmit_errno(err);
2743 if (err && __packet_get_status(po, ph) ==
2744 TP_STATUS_AVAILABLE) {
2745 /* skb was destructed already */
2750 * skb was dropped but not destructed yet;
2751 * let's treat it like congestion or err < 0
2755 packet_increment_head(&po->tx_ring);
2757 } while (likely((ph != NULL) ||
2758 /* Note: packet_read_pending() might be slow if we have
2759 * to call it as it's per_cpu variable, but in fast-path
2760 * we already short-circuit the loop with the first
2761 * condition, and luckily don't have to go that path
2764 (need_wait && packet_read_pending(&po->tx_ring))));
2770 __packet_set_status(po, ph, status);
2775 mutex_unlock(&po->pg_vec_lock);
2779 static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
2780 size_t reserve, size_t len,
2781 size_t linear, int noblock,
2784 struct sk_buff *skb;
2786 /* Under a page? Don't bother with paged skb. */
2787 if (prepad + len < PAGE_SIZE || !linear)
2790 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
2795 skb_reserve(skb, reserve);
2796 skb_put(skb, linear);
2797 skb->data_len = len - linear;
2798 skb->len += len - linear;
2803 static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
2805 struct sock *sk = sock->sk;
2806 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2807 struct sk_buff *skb;
2808 struct net_device *dev;
2810 unsigned char *addr;
2811 int err, reserve = 0;
2812 struct sockcm_cookie sockc;
2813 struct virtio_net_hdr vnet_hdr = { 0 };
2815 struct packet_sock *po = pkt_sk(sk);
2820 * Get and verify the address.
2823 if (likely(saddr == NULL)) {
2824 dev = packet_cached_dev_get(po);
2829 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2831 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
2833 proto = saddr->sll_protocol;
2834 addr = saddr->sll_addr;
2835 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
2839 if (unlikely(dev == NULL))
2842 if (unlikely(!(dev->flags & IFF_UP)))
2845 sockc.tsflags = sk->sk_tsflags;
2846 sockc.mark = sk->sk_mark;
2847 if (msg->msg_controllen) {
2848 err = sock_cmsg_send(sk, msg, &sockc);
2853 if (sock->type == SOCK_RAW)
2854 reserve = dev->hard_header_len;
2855 if (po->has_vnet_hdr) {
2856 err = packet_snd_vnet_parse(msg, &len, &vnet_hdr);
2861 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
2862 if (!netif_supports_nofcs(dev)) {
2863 err = -EPROTONOSUPPORT;
2866 extra_len = 4; /* We're doing our own CRC */
2870 if (!vnet_hdr.gso_type &&
2871 (len > dev->mtu + reserve + VLAN_HLEN + extra_len))
2875 hlen = LL_RESERVED_SPACE(dev);
2876 tlen = dev->needed_tailroom;
2877 skb = packet_alloc_skb(sk, hlen + tlen, hlen, len,
2878 __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len),
2879 msg->msg_flags & MSG_DONTWAIT, &err);
2883 skb_set_network_header(skb, reserve);
2886 if (sock->type == SOCK_DGRAM) {
2887 offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len);
2888 if (unlikely(offset < 0))
2892 /* Returns -EFAULT on error */
2893 err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len);
2897 if (sock->type == SOCK_RAW &&
2898 !dev_validate_header(dev, skb->data, len)) {
2903 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
2905 if (!vnet_hdr.gso_type && (len > dev->mtu + reserve + extra_len) &&
2906 !packet_extra_vlan_len_allowed(dev, skb)) {
2911 skb->protocol = proto;
2913 skb->priority = sk->sk_priority;
2914 skb->mark = sockc.mark;
2916 packet_pick_tx_queue(dev, skb);
2918 if (po->has_vnet_hdr) {
2919 err = packet_snd_vnet_gso(skb, &vnet_hdr);
2922 len += sizeof(vnet_hdr);
2925 skb_probe_transport_header(skb, reserve);
2927 if (unlikely(extra_len == 4))
2930 err = po->xmit(skb);
2931 if (err > 0 && (err = net_xmit_errno(err)) != 0)
2947 static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2949 struct sock *sk = sock->sk;
2950 struct packet_sock *po = pkt_sk(sk);
2952 if (po->tx_ring.pg_vec)
2953 return tpacket_snd(po, msg);
2955 return packet_snd(sock, msg, len);
2959 * Close a PACKET socket. This is fairly simple. We immediately go
2960 * to 'closed' state and remove our protocol entry in the device list.
2963 static int packet_release(struct socket *sock)
2965 struct sock *sk = sock->sk;
2966 struct packet_sock *po;
2968 union tpacket_req_u req_u;
2976 mutex_lock(&net->packet.sklist_lock);
2977 sk_del_node_init_rcu(sk);
2978 mutex_unlock(&net->packet.sklist_lock);
2981 sock_prot_inuse_add(net, sk->sk_prot, -1);
2984 spin_lock(&po->bind_lock);
2985 unregister_prot_hook(sk, false);
2986 packet_cached_dev_reset(po);
2988 if (po->prot_hook.dev) {
2989 dev_put(po->prot_hook.dev);
2990 po->prot_hook.dev = NULL;
2992 spin_unlock(&po->bind_lock);
2994 packet_flush_mclist(sk);
2996 if (po->rx_ring.pg_vec) {
2997 memset(&req_u, 0, sizeof(req_u));
2998 packet_set_ring(sk, &req_u, 1, 0);
3001 if (po->tx_ring.pg_vec) {
3002 memset(&req_u, 0, sizeof(req_u));
3003 packet_set_ring(sk, &req_u, 1, 1);
3010 * Now the socket is dead. No more input will appear.
3017 skb_queue_purge(&sk->sk_receive_queue);
3018 packet_free_pending(po);
3019 sk_refcnt_debug_release(sk);
3026 * Attach a packet hook.
3029 static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
3032 struct packet_sock *po = pkt_sk(sk);
3033 struct net_device *dev_curr;
3036 struct net_device *dev = NULL;
3038 bool unlisted = false;
3044 spin_lock(&po->bind_lock);
3048 dev = dev_get_by_name_rcu(sock_net(sk), name);
3053 } else if (ifindex) {
3054 dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
3064 proto_curr = po->prot_hook.type;
3065 dev_curr = po->prot_hook.dev;
3067 need_rehook = proto_curr != proto || dev_curr != dev;
3072 __unregister_prot_hook(sk, true);
3074 dev_curr = po->prot_hook.dev;
3076 unlisted = !dev_get_by_index_rcu(sock_net(sk),
3081 po->prot_hook.type = proto;
3083 if (unlikely(unlisted)) {
3085 po->prot_hook.dev = NULL;
3087 packet_cached_dev_reset(po);
3089 po->prot_hook.dev = dev;
3090 po->ifindex = dev ? dev->ifindex : 0;
3091 packet_cached_dev_assign(po, dev);
3097 if (proto == 0 || !need_rehook)
3100 if (!unlisted && (!dev || (dev->flags & IFF_UP))) {
3101 register_prot_hook(sk);
3103 sk->sk_err = ENETDOWN;
3104 if (!sock_flag(sk, SOCK_DEAD))
3105 sk->sk_error_report(sk);
3110 spin_unlock(&po->bind_lock);
3116 * Bind a packet socket to a device
3119 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
3122 struct sock *sk = sock->sk;
3129 if (addr_len != sizeof(struct sockaddr))
3131 strlcpy(name, uaddr->sa_data, sizeof(name));
3133 return packet_do_bind(sk, name, 0, pkt_sk(sk)->num);
3136 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
3138 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
3139 struct sock *sk = sock->sk;
3145 if (addr_len < sizeof(struct sockaddr_ll))
3147 if (sll->sll_family != AF_PACKET)
3150 return packet_do_bind(sk, NULL, sll->sll_ifindex,
3151 sll->sll_protocol ? : pkt_sk(sk)->num);
3154 static struct proto packet_proto = {
3156 .owner = THIS_MODULE,
3157 .obj_size = sizeof(struct packet_sock),
3161 * Create a packet of type SOCK_PACKET.
3164 static int packet_create(struct net *net, struct socket *sock, int protocol,
3168 struct packet_sock *po;
3169 __be16 proto = (__force __be16)protocol; /* weird, but documented */
3172 if (!ns_capable(net->user_ns, CAP_NET_RAW))
3174 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
3175 sock->type != SOCK_PACKET)
3176 return -ESOCKTNOSUPPORT;
3178 sock->state = SS_UNCONNECTED;
3181 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto, kern);
3185 sock->ops = &packet_ops;
3186 if (sock->type == SOCK_PACKET)
3187 sock->ops = &packet_ops_spkt;
3189 sock_init_data(sock, sk);
3192 sk->sk_family = PF_PACKET;
3194 po->xmit = dev_queue_xmit;
3196 err = packet_alloc_pending(po);
3200 packet_cached_dev_reset(po);
3202 sk->sk_destruct = packet_sock_destruct;
3203 sk_refcnt_debug_inc(sk);
3206 * Attach a protocol block
3209 spin_lock_init(&po->bind_lock);
3210 mutex_init(&po->pg_vec_lock);
3211 po->rollover = NULL;
3212 po->prot_hook.func = packet_rcv;
3214 if (sock->type == SOCK_PACKET)
3215 po->prot_hook.func = packet_rcv_spkt;
3217 po->prot_hook.af_packet_priv = sk;
3220 po->prot_hook.type = proto;
3221 register_prot_hook(sk);
3224 mutex_lock(&net->packet.sklist_lock);
3225 sk_add_node_rcu(sk, &net->packet.sklist);
3226 mutex_unlock(&net->packet.sklist_lock);
3229 sock_prot_inuse_add(net, &packet_proto, 1);
3240 * Pull a packet from our receive queue and hand it to the user.
3241 * If necessary we block.
3244 static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3247 struct sock *sk = sock->sk;
3248 struct sk_buff *skb;
3250 int vnet_hdr_len = 0;
3251 unsigned int origlen = 0;
3254 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
3258 /* What error should we return now? EUNATTACH? */
3259 if (pkt_sk(sk)->ifindex < 0)
3263 if (flags & MSG_ERRQUEUE) {
3264 err = sock_recv_errqueue(sk, msg, len,
3265 SOL_PACKET, PACKET_TX_TIMESTAMP);
3270 * Call the generic datagram receiver. This handles all sorts
3271 * of horrible races and re-entrancy so we can forget about it
3272 * in the protocol layers.
3274 * Now it will return ENETDOWN, if device have just gone down,
3275 * but then it will block.
3278 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3281 * An error occurred so return it. Because skb_recv_datagram()
3282 * handles the blocking we don't see and worry about blocking
3289 if (pkt_sk(sk)->pressure)
3290 packet_rcv_has_room(pkt_sk(sk), NULL);
3292 if (pkt_sk(sk)->has_vnet_hdr) {
3293 err = packet_rcv_vnet(msg, skb, &len);
3296 vnet_hdr_len = sizeof(struct virtio_net_hdr);
3299 /* You lose any data beyond the buffer you gave. If it worries
3300 * a user program they can ask the device for its MTU
3306 msg->msg_flags |= MSG_TRUNC;
3309 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3313 if (sock->type != SOCK_PACKET) {
3314 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3316 /* Original length was stored in sockaddr_ll fields */
3317 origlen = PACKET_SKB_CB(skb)->sa.origlen;
3318 sll->sll_family = AF_PACKET;
3319 sll->sll_protocol = skb->protocol;
3322 sock_recv_ts_and_drops(msg, sk, skb);
3324 if (msg->msg_name) {
3325 /* If the address length field is there to be filled
3326 * in, we fill it in now.
3328 if (sock->type == SOCK_PACKET) {
3329 __sockaddr_check_size(sizeof(struct sockaddr_pkt));
3330 msg->msg_namelen = sizeof(struct sockaddr_pkt);
3332 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3334 msg->msg_namelen = sll->sll_halen +
3335 offsetof(struct sockaddr_ll, sll_addr);
3337 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
3341 if (pkt_sk(sk)->auxdata) {
3342 struct tpacket_auxdata aux;
3344 aux.tp_status = TP_STATUS_USER;
3345 if (skb->ip_summed == CHECKSUM_PARTIAL)
3346 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
3347 else if (skb->pkt_type != PACKET_OUTGOING &&
3348 (skb->ip_summed == CHECKSUM_COMPLETE ||
3349 skb_csum_unnecessary(skb)))
3350 aux.tp_status |= TP_STATUS_CSUM_VALID;
3352 aux.tp_len = origlen;
3353 aux.tp_snaplen = skb->len;
3355 aux.tp_net = skb_network_offset(skb);
3356 if (skb_vlan_tag_present(skb)) {
3357 aux.tp_vlan_tci = skb_vlan_tag_get(skb);
3358 aux.tp_vlan_tpid = ntohs(skb->vlan_proto);
3359 aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
3361 aux.tp_vlan_tci = 0;
3362 aux.tp_vlan_tpid = 0;
3364 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
3368 * Free or return the buffer as appropriate. Again this
3369 * hides all the races and re-entrancy issues from us.
3371 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
3374 skb_free_datagram(sk, skb);
3379 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
3380 int *uaddr_len, int peer)
3382 struct net_device *dev;
3383 struct sock *sk = sock->sk;
3388 uaddr->sa_family = AF_PACKET;
3389 memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
3391 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
3393 strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
3395 *uaddr_len = sizeof(*uaddr);
3400 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
3401 int *uaddr_len, int peer)
3403 struct net_device *dev;
3404 struct sock *sk = sock->sk;
3405 struct packet_sock *po = pkt_sk(sk);
3406 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
3411 sll->sll_family = AF_PACKET;
3412 sll->sll_ifindex = po->ifindex;
3413 sll->sll_protocol = po->num;
3414 sll->sll_pkttype = 0;
3416 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
3418 sll->sll_hatype = dev->type;
3419 sll->sll_halen = dev->addr_len;
3420 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
3422 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
3426 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
3431 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
3435 case PACKET_MR_MULTICAST:
3436 if (i->alen != dev->addr_len)
3439 return dev_mc_add(dev, i->addr);
3441 return dev_mc_del(dev, i->addr);
3443 case PACKET_MR_PROMISC:
3444 return dev_set_promiscuity(dev, what);
3445 case PACKET_MR_ALLMULTI:
3446 return dev_set_allmulti(dev, what);
3447 case PACKET_MR_UNICAST:
3448 if (i->alen != dev->addr_len)
3451 return dev_uc_add(dev, i->addr);
3453 return dev_uc_del(dev, i->addr);
3461 static void packet_dev_mclist_delete(struct net_device *dev,
3462 struct packet_mclist **mlp)
3464 struct packet_mclist *ml;
3466 while ((ml = *mlp) != NULL) {
3467 if (ml->ifindex == dev->ifindex) {
3468 packet_dev_mc(dev, ml, -1);
3476 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
3478 struct packet_sock *po = pkt_sk(sk);
3479 struct packet_mclist *ml, *i;
3480 struct net_device *dev;
3486 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
3491 if (mreq->mr_alen > dev->addr_len)
3495 i = kmalloc(sizeof(*i), GFP_KERNEL);
3500 for (ml = po->mclist; ml; ml = ml->next) {
3501 if (ml->ifindex == mreq->mr_ifindex &&
3502 ml->type == mreq->mr_type &&
3503 ml->alen == mreq->mr_alen &&
3504 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3506 /* Free the new element ... */
3512 i->type = mreq->mr_type;
3513 i->ifindex = mreq->mr_ifindex;
3514 i->alen = mreq->mr_alen;
3515 memcpy(i->addr, mreq->mr_address, i->alen);
3516 memset(i->addr + i->alen, 0, sizeof(i->addr) - i->alen);
3518 i->next = po->mclist;
3520 err = packet_dev_mc(dev, i, 1);
3522 po->mclist = i->next;
3531 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
3533 struct packet_mclist *ml, **mlp;
3537 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
3538 if (ml->ifindex == mreq->mr_ifindex &&
3539 ml->type == mreq->mr_type &&
3540 ml->alen == mreq->mr_alen &&
3541 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3542 if (--ml->count == 0) {
3543 struct net_device *dev;
3545 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3547 packet_dev_mc(dev, ml, -1);
3557 static void packet_flush_mclist(struct sock *sk)
3559 struct packet_sock *po = pkt_sk(sk);
3560 struct packet_mclist *ml;
3566 while ((ml = po->mclist) != NULL) {
3567 struct net_device *dev;
3569 po->mclist = ml->next;
3570 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3572 packet_dev_mc(dev, ml, -1);
3579 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
3581 struct sock *sk = sock->sk;
3582 struct packet_sock *po = pkt_sk(sk);
3585 if (level != SOL_PACKET)
3586 return -ENOPROTOOPT;
3589 case PACKET_ADD_MEMBERSHIP:
3590 case PACKET_DROP_MEMBERSHIP:
3592 struct packet_mreq_max mreq;
3594 memset(&mreq, 0, sizeof(mreq));
3595 if (len < sizeof(struct packet_mreq))
3597 if (len > sizeof(mreq))
3599 if (copy_from_user(&mreq, optval, len))
3601 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
3603 if (optname == PACKET_ADD_MEMBERSHIP)
3604 ret = packet_mc_add(sk, &mreq);
3606 ret = packet_mc_drop(sk, &mreq);
3610 case PACKET_RX_RING:
3611 case PACKET_TX_RING:
3613 union tpacket_req_u req_u;
3616 switch (po->tp_version) {
3619 len = sizeof(req_u.req);
3623 len = sizeof(req_u.req3);
3628 if (copy_from_user(&req_u.req, optval, len))
3630 return packet_set_ring(sk, &req_u, 0,
3631 optname == PACKET_TX_RING);
3633 case PACKET_COPY_THRESH:
3637 if (optlen != sizeof(val))
3639 if (copy_from_user(&val, optval, sizeof(val)))
3642 pkt_sk(sk)->copy_thresh = val;
3645 case PACKET_VERSION:
3649 if (optlen != sizeof(val))
3651 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3653 if (copy_from_user(&val, optval, sizeof(val)))
3659 po->tp_version = val;
3665 case PACKET_RESERVE:
3669 if (optlen != sizeof(val))
3671 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3673 if (copy_from_user(&val, optval, sizeof(val)))
3675 po->tp_reserve = val;
3682 if (optlen != sizeof(val))
3684 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3686 if (copy_from_user(&val, optval, sizeof(val)))
3688 po->tp_loss = !!val;
3691 case PACKET_AUXDATA:
3695 if (optlen < sizeof(val))
3697 if (copy_from_user(&val, optval, sizeof(val)))
3700 po->auxdata = !!val;
3703 case PACKET_ORIGDEV:
3707 if (optlen < sizeof(val))
3709 if (copy_from_user(&val, optval, sizeof(val)))
3712 po->origdev = !!val;
3715 case PACKET_VNET_HDR:
3719 if (sock->type != SOCK_RAW)
3721 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3723 if (optlen < sizeof(val))
3725 if (copy_from_user(&val, optval, sizeof(val)))
3728 po->has_vnet_hdr = !!val;
3731 case PACKET_TIMESTAMP:
3735 if (optlen != sizeof(val))
3737 if (copy_from_user(&val, optval, sizeof(val)))
3740 po->tp_tstamp = val;
3747 if (optlen != sizeof(val))
3749 if (copy_from_user(&val, optval, sizeof(val)))
3752 return fanout_add(sk, val & 0xffff, val >> 16);
3754 case PACKET_FANOUT_DATA:
3759 return fanout_set_data(po, optval, optlen);
3761 case PACKET_TX_HAS_OFF:
3765 if (optlen != sizeof(val))
3767 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3769 if (copy_from_user(&val, optval, sizeof(val)))
3771 po->tp_tx_has_off = !!val;
3774 case PACKET_QDISC_BYPASS:
3778 if (optlen != sizeof(val))
3780 if (copy_from_user(&val, optval, sizeof(val)))
3783 po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
3787 return -ENOPROTOOPT;
3791 static int packet_getsockopt(struct socket *sock, int level, int optname,
3792 char __user *optval, int __user *optlen)
3795 int val, lv = sizeof(val);
3796 struct sock *sk = sock->sk;
3797 struct packet_sock *po = pkt_sk(sk);
3799 union tpacket_stats_u st;
3800 struct tpacket_rollover_stats rstats;
3802 if (level != SOL_PACKET)
3803 return -ENOPROTOOPT;
3805 if (get_user(len, optlen))
3812 case PACKET_STATISTICS:
3813 spin_lock_bh(&sk->sk_receive_queue.lock);
3814 memcpy(&st, &po->stats, sizeof(st));
3815 memset(&po->stats, 0, sizeof(po->stats));
3816 spin_unlock_bh(&sk->sk_receive_queue.lock);
3818 if (po->tp_version == TPACKET_V3) {
3819 lv = sizeof(struct tpacket_stats_v3);
3820 st.stats3.tp_packets += st.stats3.tp_drops;
3823 lv = sizeof(struct tpacket_stats);
3824 st.stats1.tp_packets += st.stats1.tp_drops;
3829 case PACKET_AUXDATA:
3832 case PACKET_ORIGDEV:
3835 case PACKET_VNET_HDR:
3836 val = po->has_vnet_hdr;
3838 case PACKET_VERSION:
3839 val = po->tp_version;
3842 if (len > sizeof(int))
3844 if (copy_from_user(&val, optval, len))
3848 val = sizeof(struct tpacket_hdr);
3851 val = sizeof(struct tpacket2_hdr);
3854 val = sizeof(struct tpacket3_hdr);
3860 case PACKET_RESERVE:
3861 val = po->tp_reserve;
3866 case PACKET_TIMESTAMP:
3867 val = po->tp_tstamp;
3871 ((u32)po->fanout->id |
3872 ((u32)po->fanout->type << 16) |
3873 ((u32)po->fanout->flags << 24)) :
3876 case PACKET_ROLLOVER_STATS:
3879 rstats.tp_all = atomic_long_read(&po->rollover->num);
3880 rstats.tp_huge = atomic_long_read(&po->rollover->num_huge);
3881 rstats.tp_failed = atomic_long_read(&po->rollover->num_failed);
3883 lv = sizeof(rstats);
3885 case PACKET_TX_HAS_OFF:
3886 val = po->tp_tx_has_off;
3888 case PACKET_QDISC_BYPASS:
3889 val = packet_use_direct_xmit(po);
3892 return -ENOPROTOOPT;
3897 if (put_user(len, optlen))
3899 if (copy_to_user(optval, data, len))
3905 #ifdef CONFIG_COMPAT
3906 static int compat_packet_setsockopt(struct socket *sock, int level, int optname,
3907 char __user *optval, unsigned int optlen)
3909 struct packet_sock *po = pkt_sk(sock->sk);
3911 if (level != SOL_PACKET)
3912 return -ENOPROTOOPT;
3914 if (optname == PACKET_FANOUT_DATA &&
3915 po->fanout && po->fanout->type == PACKET_FANOUT_CBPF) {
3916 optval = (char __user *)get_compat_bpf_fprog(optval);
3919 optlen = sizeof(struct sock_fprog);
3922 return packet_setsockopt(sock, level, optname, optval, optlen);
3926 static int packet_notifier(struct notifier_block *this,
3927 unsigned long msg, void *ptr)
3930 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3931 struct net *net = dev_net(dev);
3934 sk_for_each_rcu(sk, &net->packet.sklist) {
3935 struct packet_sock *po = pkt_sk(sk);
3938 case NETDEV_UNREGISTER:
3940 packet_dev_mclist_delete(dev, &po->mclist);
3944 if (dev->ifindex == po->ifindex) {
3945 spin_lock(&po->bind_lock);
3947 __unregister_prot_hook(sk, false);
3948 sk->sk_err = ENETDOWN;
3949 if (!sock_flag(sk, SOCK_DEAD))
3950 sk->sk_error_report(sk);
3952 if (msg == NETDEV_UNREGISTER) {
3953 packet_cached_dev_reset(po);
3956 if (po->prot_hook.dev)
3957 dev_put(po->prot_hook.dev);
3958 po->prot_hook.dev = NULL;
3960 spin_unlock(&po->bind_lock);
3964 if (dev->ifindex == po->ifindex) {
3965 spin_lock(&po->bind_lock);
3967 register_prot_hook(sk);
3968 spin_unlock(&po->bind_lock);
3978 static int packet_ioctl(struct socket *sock, unsigned int cmd,
3981 struct sock *sk = sock->sk;
3986 int amount = sk_wmem_alloc_get(sk);
3988 return put_user(amount, (int __user *)arg);
3992 struct sk_buff *skb;
3995 spin_lock_bh(&sk->sk_receive_queue.lock);
3996 skb = skb_peek(&sk->sk_receive_queue);
3999 spin_unlock_bh(&sk->sk_receive_queue.lock);
4000 return put_user(amount, (int __user *)arg);
4003 return sock_get_timestamp(sk, (struct timeval __user *)arg);
4005 return sock_get_timestampns(sk, (struct timespec __user *)arg);
4015 case SIOCGIFBRDADDR:
4016 case SIOCSIFBRDADDR:
4017 case SIOCGIFNETMASK:
4018 case SIOCSIFNETMASK:
4019 case SIOCGIFDSTADDR:
4020 case SIOCSIFDSTADDR:
4022 return inet_dgram_ops.ioctl(sock, cmd, arg);
4026 return -ENOIOCTLCMD;
4031 static unsigned int packet_poll(struct file *file, struct socket *sock,
4034 struct sock *sk = sock->sk;
4035 struct packet_sock *po = pkt_sk(sk);
4036 unsigned int mask = datagram_poll(file, sock, wait);
4038 spin_lock_bh(&sk->sk_receive_queue.lock);
4039 if (po->rx_ring.pg_vec) {
4040 if (!packet_previous_rx_frame(po, &po->rx_ring,
4042 mask |= POLLIN | POLLRDNORM;
4044 if (po->pressure && __packet_rcv_has_room(po, NULL) == ROOM_NORMAL)
4046 spin_unlock_bh(&sk->sk_receive_queue.lock);
4047 spin_lock_bh(&sk->sk_write_queue.lock);
4048 if (po->tx_ring.pg_vec) {
4049 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
4050 mask |= POLLOUT | POLLWRNORM;
4052 spin_unlock_bh(&sk->sk_write_queue.lock);
4057 /* Dirty? Well, I still did not learn better way to account
4061 static void packet_mm_open(struct vm_area_struct *vma)
4063 struct file *file = vma->vm_file;
4064 struct socket *sock = file->private_data;
4065 struct sock *sk = sock->sk;
4068 atomic_inc(&pkt_sk(sk)->mapped);
4071 static void packet_mm_close(struct vm_area_struct *vma)
4073 struct file *file = vma->vm_file;
4074 struct socket *sock = file->private_data;
4075 struct sock *sk = sock->sk;
4078 atomic_dec(&pkt_sk(sk)->mapped);
4081 static const struct vm_operations_struct packet_mmap_ops = {
4082 .open = packet_mm_open,
4083 .close = packet_mm_close,
4086 static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
4091 for (i = 0; i < len; i++) {
4092 if (likely(pg_vec[i].buffer)) {
4093 if (is_vmalloc_addr(pg_vec[i].buffer))
4094 vfree(pg_vec[i].buffer);
4096 free_pages((unsigned long)pg_vec[i].buffer,
4098 pg_vec[i].buffer = NULL;
4104 static char *alloc_one_pg_vec_page(unsigned long order)
4107 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
4108 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
4110 buffer = (char *) __get_free_pages(gfp_flags, order);
4114 /* __get_free_pages failed, fall back to vmalloc */
4115 buffer = vzalloc((1 << order) * PAGE_SIZE);
4119 /* vmalloc failed, lets dig into swap here */
4120 gfp_flags &= ~__GFP_NORETRY;
4121 buffer = (char *) __get_free_pages(gfp_flags, order);
4125 /* complete and utter failure */
4129 static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
4131 unsigned int block_nr = req->tp_block_nr;
4135 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
4136 if (unlikely(!pg_vec))
4139 for (i = 0; i < block_nr; i++) {
4140 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
4141 if (unlikely(!pg_vec[i].buffer))
4142 goto out_free_pgvec;
4149 free_pg_vec(pg_vec, order, block_nr);
4154 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
4155 int closing, int tx_ring)
4157 struct pgv *pg_vec = NULL;
4158 struct packet_sock *po = pkt_sk(sk);
4159 int was_running, order = 0;
4160 struct packet_ring_buffer *rb;
4161 struct sk_buff_head *rb_queue;
4164 /* Added to avoid minimal code churn */
4165 struct tpacket_req *req = &req_u->req;
4167 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
4168 if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) {
4169 net_warn_ratelimited("Tx-ring is not supported.\n");
4173 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
4174 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
4178 if (atomic_read(&po->mapped))
4180 if (packet_read_pending(rb))
4184 if (req->tp_block_nr) {
4185 /* Sanity tests and some calculations */
4187 if (unlikely(rb->pg_vec))
4190 switch (po->tp_version) {
4192 po->tp_hdrlen = TPACKET_HDRLEN;
4195 po->tp_hdrlen = TPACKET2_HDRLEN;
4198 po->tp_hdrlen = TPACKET3_HDRLEN;
4203 if (unlikely((int)req->tp_block_size <= 0))
4205 if (unlikely(!PAGE_ALIGNED(req->tp_block_size)))
4207 if (po->tp_version >= TPACKET_V3 &&
4208 (int)(req->tp_block_size -
4209 BLK_PLUS_PRIV(req_u->req3.tp_sizeof_priv)) <= 0)
4211 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
4214 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
4217 rb->frames_per_block = req->tp_block_size / req->tp_frame_size;
4218 if (unlikely(rb->frames_per_block == 0))
4220 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
4225 order = get_order(req->tp_block_size);
4226 pg_vec = alloc_pg_vec(req, order);
4227 if (unlikely(!pg_vec))
4229 switch (po->tp_version) {
4231 /* Transmit path is not supported. We checked
4232 * it above but just being paranoid
4235 init_prb_bdqc(po, rb, pg_vec, req_u);
4244 if (unlikely(req->tp_frame_nr))
4250 /* Detach socket from network */
4251 spin_lock(&po->bind_lock);
4252 was_running = po->running;
4256 __unregister_prot_hook(sk, false);
4258 spin_unlock(&po->bind_lock);
4263 mutex_lock(&po->pg_vec_lock);
4264 if (closing || atomic_read(&po->mapped) == 0) {
4266 spin_lock_bh(&rb_queue->lock);
4267 swap(rb->pg_vec, pg_vec);
4268 rb->frame_max = (req->tp_frame_nr - 1);
4270 rb->frame_size = req->tp_frame_size;
4271 spin_unlock_bh(&rb_queue->lock);
4273 swap(rb->pg_vec_order, order);
4274 swap(rb->pg_vec_len, req->tp_block_nr);
4276 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
4277 po->prot_hook.func = (po->rx_ring.pg_vec) ?
4278 tpacket_rcv : packet_rcv;
4279 skb_queue_purge(rb_queue);
4280 if (atomic_read(&po->mapped))
4281 pr_err("packet_mmap: vma is busy: %d\n",
4282 atomic_read(&po->mapped));
4284 mutex_unlock(&po->pg_vec_lock);
4286 spin_lock(&po->bind_lock);
4289 register_prot_hook(sk);
4291 spin_unlock(&po->bind_lock);
4292 if (closing && (po->tp_version > TPACKET_V2)) {
4293 /* Because we don't support block-based V3 on tx-ring */
4295 prb_shutdown_retire_blk_timer(po, rb_queue);
4300 free_pg_vec(pg_vec, order, req->tp_block_nr);
4305 static int packet_mmap(struct file *file, struct socket *sock,
4306 struct vm_area_struct *vma)
4308 struct sock *sk = sock->sk;
4309 struct packet_sock *po = pkt_sk(sk);
4310 unsigned long size, expected_size;
4311 struct packet_ring_buffer *rb;
4312 unsigned long start;
4319 mutex_lock(&po->pg_vec_lock);
4322 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4324 expected_size += rb->pg_vec_len
4330 if (expected_size == 0)
4333 size = vma->vm_end - vma->vm_start;
4334 if (size != expected_size)
4337 start = vma->vm_start;
4338 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4339 if (rb->pg_vec == NULL)
4342 for (i = 0; i < rb->pg_vec_len; i++) {
4344 void *kaddr = rb->pg_vec[i].buffer;
4347 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
4348 page = pgv_to_page(kaddr);
4349 err = vm_insert_page(vma, start, page);
4358 atomic_inc(&po->mapped);
4359 vma->vm_ops = &packet_mmap_ops;
4363 mutex_unlock(&po->pg_vec_lock);
4367 static const struct proto_ops packet_ops_spkt = {
4368 .family = PF_PACKET,
4369 .owner = THIS_MODULE,
4370 .release = packet_release,
4371 .bind = packet_bind_spkt,
4372 .connect = sock_no_connect,
4373 .socketpair = sock_no_socketpair,
4374 .accept = sock_no_accept,
4375 .getname = packet_getname_spkt,
4376 .poll = datagram_poll,
4377 .ioctl = packet_ioctl,
4378 .listen = sock_no_listen,
4379 .shutdown = sock_no_shutdown,
4380 .setsockopt = sock_no_setsockopt,
4381 .getsockopt = sock_no_getsockopt,
4382 .sendmsg = packet_sendmsg_spkt,
4383 .recvmsg = packet_recvmsg,
4384 .mmap = sock_no_mmap,
4385 .sendpage = sock_no_sendpage,
4388 static const struct proto_ops packet_ops = {
4389 .family = PF_PACKET,
4390 .owner = THIS_MODULE,
4391 .release = packet_release,
4392 .bind = packet_bind,
4393 .connect = sock_no_connect,
4394 .socketpair = sock_no_socketpair,
4395 .accept = sock_no_accept,
4396 .getname = packet_getname,
4397 .poll = packet_poll,
4398 .ioctl = packet_ioctl,
4399 .listen = sock_no_listen,
4400 .shutdown = sock_no_shutdown,
4401 .setsockopt = packet_setsockopt,
4402 .getsockopt = packet_getsockopt,
4403 #ifdef CONFIG_COMPAT
4404 .compat_setsockopt = compat_packet_setsockopt,
4406 .sendmsg = packet_sendmsg,
4407 .recvmsg = packet_recvmsg,
4408 .mmap = packet_mmap,
4409 .sendpage = sock_no_sendpage,
4412 static const struct net_proto_family packet_family_ops = {
4413 .family = PF_PACKET,
4414 .create = packet_create,
4415 .owner = THIS_MODULE,
4418 static struct notifier_block packet_netdev_notifier = {
4419 .notifier_call = packet_notifier,
4422 #ifdef CONFIG_PROC_FS
4424 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
4427 struct net *net = seq_file_net(seq);
4430 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
4433 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4435 struct net *net = seq_file_net(seq);
4436 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
4439 static void packet_seq_stop(struct seq_file *seq, void *v)
4445 static int packet_seq_show(struct seq_file *seq, void *v)
4447 if (v == SEQ_START_TOKEN)
4448 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4450 struct sock *s = sk_entry(v);
4451 const struct packet_sock *po = pkt_sk(s);
4454 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
4456 atomic_read(&s->sk_refcnt),
4461 atomic_read(&s->sk_rmem_alloc),
4462 from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)),
4469 static const struct seq_operations packet_seq_ops = {
4470 .start = packet_seq_start,
4471 .next = packet_seq_next,
4472 .stop = packet_seq_stop,
4473 .show = packet_seq_show,
4476 static int packet_seq_open(struct inode *inode, struct file *file)
4478 return seq_open_net(inode, file, &packet_seq_ops,
4479 sizeof(struct seq_net_private));
4482 static const struct file_operations packet_seq_fops = {
4483 .owner = THIS_MODULE,
4484 .open = packet_seq_open,
4486 .llseek = seq_lseek,
4487 .release = seq_release_net,
4492 static int __net_init packet_net_init(struct net *net)
4494 mutex_init(&net->packet.sklist_lock);
4495 INIT_HLIST_HEAD(&net->packet.sklist);
4497 if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops))
4503 static void __net_exit packet_net_exit(struct net *net)
4505 remove_proc_entry("packet", net->proc_net);
4508 static struct pernet_operations packet_net_ops = {
4509 .init = packet_net_init,
4510 .exit = packet_net_exit,
4514 static void __exit packet_exit(void)
4516 unregister_netdevice_notifier(&packet_netdev_notifier);
4517 unregister_pernet_subsys(&packet_net_ops);
4518 sock_unregister(PF_PACKET);
4519 proto_unregister(&packet_proto);
4522 static int __init packet_init(void)
4524 int rc = proto_register(&packet_proto, 0);
4529 sock_register(&packet_family_ops);
4530 register_pernet_subsys(&packet_net_ops);
4531 register_netdevice_notifier(&packet_netdev_notifier);
4536 module_init(packet_init);
4537 module_exit(packet_exit);
4538 MODULE_LICENSE("GPL");
4539 MODULE_ALIAS_NETPROTO(PF_PACKET);