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_rollover *rollover = NULL;
1623 struct packet_sock *po = pkt_sk(sk);
1624 struct packet_fanout *f, *match;
1625 u8 type = type_flags & 0xff;
1626 u8 flags = type_flags >> 8;
1630 case PACKET_FANOUT_ROLLOVER:
1631 if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)
1633 case PACKET_FANOUT_HASH:
1634 case PACKET_FANOUT_LB:
1635 case PACKET_FANOUT_CPU:
1636 case PACKET_FANOUT_RND:
1637 case PACKET_FANOUT_QM:
1638 case PACKET_FANOUT_CBPF:
1639 case PACKET_FANOUT_EBPF:
1645 mutex_lock(&fanout_mutex);
1655 if (type == PACKET_FANOUT_ROLLOVER ||
1656 (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) {
1658 rollover = kzalloc(sizeof(*rollover), GFP_KERNEL);
1661 atomic_long_set(&rollover->num, 0);
1662 atomic_long_set(&rollover->num_huge, 0);
1663 atomic_long_set(&rollover->num_failed, 0);
1664 po->rollover = rollover;
1668 list_for_each_entry(f, &fanout_list, list) {
1670 read_pnet(&f->net) == sock_net(sk)) {
1676 if (match && match->flags != flags)
1680 match = kzalloc(sizeof(*match), GFP_KERNEL);
1683 write_pnet(&match->net, sock_net(sk));
1686 match->flags = flags;
1687 INIT_LIST_HEAD(&match->list);
1688 spin_lock_init(&match->lock);
1689 atomic_set(&match->sk_ref, 0);
1690 fanout_init_data(match);
1691 match->prot_hook.type = po->prot_hook.type;
1692 match->prot_hook.dev = po->prot_hook.dev;
1693 match->prot_hook.func = packet_rcv_fanout;
1694 match->prot_hook.af_packet_priv = match;
1695 match->prot_hook.id_match = match_fanout_group;
1696 dev_add_pack(&match->prot_hook);
1697 list_add(&match->list, &fanout_list);
1700 if (match->type == type &&
1701 match->prot_hook.type == po->prot_hook.type &&
1702 match->prot_hook.dev == po->prot_hook.dev) {
1704 if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
1705 __dev_remove_pack(&po->prot_hook);
1707 atomic_inc(&match->sk_ref);
1708 __fanout_link(sk, po);
1713 if (err && rollover) {
1715 po->rollover = NULL;
1717 mutex_unlock(&fanout_mutex);
1721 static void fanout_release(struct sock *sk)
1723 struct packet_sock *po = pkt_sk(sk);
1724 struct packet_fanout *f;
1726 mutex_lock(&fanout_mutex);
1731 if (atomic_dec_and_test(&f->sk_ref)) {
1733 dev_remove_pack(&f->prot_hook);
1734 fanout_release_data(f);
1739 kfree_rcu(po->rollover, rcu);
1741 mutex_unlock(&fanout_mutex);
1744 static bool packet_extra_vlan_len_allowed(const struct net_device *dev,
1745 struct sk_buff *skb)
1747 /* Earlier code assumed this would be a VLAN pkt, double-check
1748 * this now that we have the actual packet in hand. We can only
1749 * do this check on Ethernet devices.
1751 if (unlikely(dev->type != ARPHRD_ETHER))
1754 skb_reset_mac_header(skb);
1755 return likely(eth_hdr(skb)->h_proto == htons(ETH_P_8021Q));
1758 static const struct proto_ops packet_ops;
1760 static const struct proto_ops packet_ops_spkt;
1762 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
1763 struct packet_type *pt, struct net_device *orig_dev)
1766 struct sockaddr_pkt *spkt;
1769 * When we registered the protocol we saved the socket in the data
1770 * field for just this event.
1773 sk = pt->af_packet_priv;
1776 * Yank back the headers [hope the device set this
1777 * right or kerboom...]
1779 * Incoming packets have ll header pulled,
1782 * For outgoing ones skb->data == skb_mac_header(skb)
1783 * so that this procedure is noop.
1786 if (skb->pkt_type == PACKET_LOOPBACK)
1789 if (!net_eq(dev_net(dev), sock_net(sk)))
1792 skb = skb_share_check(skb, GFP_ATOMIC);
1796 /* drop any routing info */
1799 /* drop conntrack reference */
1802 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
1804 skb_push(skb, skb->data - skb_mac_header(skb));
1807 * The SOCK_PACKET socket receives _all_ frames.
1810 spkt->spkt_family = dev->type;
1811 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
1812 spkt->spkt_protocol = skb->protocol;
1815 * Charge the memory to the socket. This is done specifically
1816 * to prevent sockets using all the memory up.
1819 if (sock_queue_rcv_skb(sk, skb) == 0)
1830 * Output a raw packet to a device layer. This bypasses all the other
1831 * protocol layers and you must therefore supply it with a complete frame
1834 static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg,
1837 struct sock *sk = sock->sk;
1838 DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name);
1839 struct sk_buff *skb = NULL;
1840 struct net_device *dev;
1841 struct sockcm_cookie sockc;
1847 * Get and verify the address.
1851 if (msg->msg_namelen < sizeof(struct sockaddr))
1853 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
1854 proto = saddr->spkt_protocol;
1856 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
1859 * Find the device first to size check it
1862 saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0;
1865 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
1871 if (!(dev->flags & IFF_UP))
1875 * You may not queue a frame bigger than the mtu. This is the lowest level
1876 * raw protocol and you must do your own fragmentation at this level.
1879 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
1880 if (!netif_supports_nofcs(dev)) {
1881 err = -EPROTONOSUPPORT;
1884 extra_len = 4; /* We're doing our own CRC */
1888 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len)
1892 size_t reserved = LL_RESERVED_SPACE(dev);
1893 int tlen = dev->needed_tailroom;
1894 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
1897 skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL);
1900 /* FIXME: Save some space for broken drivers that write a hard
1901 * header at transmission time by themselves. PPP is the notable
1902 * one here. This should really be fixed at the driver level.
1904 skb_reserve(skb, reserved);
1905 skb_reset_network_header(skb);
1907 /* Try to align data part correctly */
1912 skb_reset_network_header(skb);
1914 err = memcpy_from_msg(skb_put(skb, len), msg, len);
1920 if (!dev_validate_header(dev, skb->data, len)) {
1924 if (len > (dev->mtu + dev->hard_header_len + extra_len) &&
1925 !packet_extra_vlan_len_allowed(dev, skb)) {
1930 sockc.tsflags = sk->sk_tsflags;
1931 if (msg->msg_controllen) {
1932 err = sock_cmsg_send(sk, msg, &sockc);
1937 skb->protocol = proto;
1939 skb->priority = sk->sk_priority;
1940 skb->mark = sk->sk_mark;
1942 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
1944 if (unlikely(extra_len == 4))
1947 skb_probe_transport_header(skb, 0);
1949 dev_queue_xmit(skb);
1960 static unsigned int run_filter(struct sk_buff *skb,
1961 const struct sock *sk,
1964 struct sk_filter *filter;
1967 filter = rcu_dereference(sk->sk_filter);
1969 res = bpf_prog_run_clear_cb(filter->prog, skb);
1975 static int __packet_rcv_vnet(const struct sk_buff *skb,
1976 struct virtio_net_hdr *vnet_hdr)
1978 *vnet_hdr = (const struct virtio_net_hdr) { 0 };
1980 if (virtio_net_hdr_from_skb(skb, vnet_hdr, vio_le(), true))
1986 static int packet_rcv_vnet(struct msghdr *msg, const struct sk_buff *skb,
1989 struct virtio_net_hdr vnet_hdr;
1991 if (*len < sizeof(vnet_hdr))
1993 *len -= sizeof(vnet_hdr);
1995 if (__packet_rcv_vnet(skb, &vnet_hdr))
1998 return memcpy_to_msg(msg, (void *)&vnet_hdr, sizeof(vnet_hdr));
2002 * This function makes lazy skb cloning in hope that most of packets
2003 * are discarded by BPF.
2005 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
2006 * and skb->cb are mangled. It works because (and until) packets
2007 * falling here are owned by current CPU. Output packets are cloned
2008 * by dev_queue_xmit_nit(), input packets are processed by net_bh
2009 * sequencially, so that if we return skb to original state on exit,
2010 * we will not harm anyone.
2013 static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
2014 struct packet_type *pt, struct net_device *orig_dev)
2017 struct sockaddr_ll *sll;
2018 struct packet_sock *po;
2019 u8 *skb_head = skb->data;
2020 int skb_len = skb->len;
2021 unsigned int snaplen, res;
2022 bool is_drop_n_account = false;
2024 if (skb->pkt_type == PACKET_LOOPBACK)
2027 sk = pt->af_packet_priv;
2030 if (!net_eq(dev_net(dev), sock_net(sk)))
2035 if (dev->header_ops) {
2036 /* The device has an explicit notion of ll header,
2037 * exported to higher levels.
2039 * Otherwise, the device hides details of its frame
2040 * structure, so that corresponding packet head is
2041 * never delivered to user.
2043 if (sk->sk_type != SOCK_DGRAM)
2044 skb_push(skb, skb->data - skb_mac_header(skb));
2045 else if (skb->pkt_type == PACKET_OUTGOING) {
2046 /* Special case: outgoing packets have ll header at head */
2047 skb_pull(skb, skb_network_offset(skb));
2053 res = run_filter(skb, sk, snaplen);
2055 goto drop_n_restore;
2059 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
2062 if (skb_shared(skb)) {
2063 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
2067 if (skb_head != skb->data) {
2068 skb->data = skb_head;
2075 sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8);
2077 sll = &PACKET_SKB_CB(skb)->sa.ll;
2078 sll->sll_hatype = dev->type;
2079 sll->sll_pkttype = skb->pkt_type;
2080 if (unlikely(po->origdev))
2081 sll->sll_ifindex = orig_dev->ifindex;
2083 sll->sll_ifindex = dev->ifindex;
2085 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2087 /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg().
2088 * Use their space for storing the original skb length.
2090 PACKET_SKB_CB(skb)->sa.origlen = skb->len;
2092 if (pskb_trim(skb, snaplen))
2095 skb_set_owner_r(skb, sk);
2099 /* drop conntrack reference */
2102 spin_lock(&sk->sk_receive_queue.lock);
2103 po->stats.stats1.tp_packets++;
2104 sock_skb_set_dropcount(sk, skb);
2105 __skb_queue_tail(&sk->sk_receive_queue, skb);
2106 spin_unlock(&sk->sk_receive_queue.lock);
2107 sk->sk_data_ready(sk);
2111 is_drop_n_account = true;
2112 spin_lock(&sk->sk_receive_queue.lock);
2113 po->stats.stats1.tp_drops++;
2114 atomic_inc(&sk->sk_drops);
2115 spin_unlock(&sk->sk_receive_queue.lock);
2118 if (skb_head != skb->data && skb_shared(skb)) {
2119 skb->data = skb_head;
2123 if (!is_drop_n_account)
2130 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
2131 struct packet_type *pt, struct net_device *orig_dev)
2134 struct packet_sock *po;
2135 struct sockaddr_ll *sll;
2136 union tpacket_uhdr h;
2137 u8 *skb_head = skb->data;
2138 int skb_len = skb->len;
2139 unsigned int snaplen, res;
2140 unsigned long status = TP_STATUS_USER;
2141 unsigned short macoff, netoff, hdrlen;
2142 struct sk_buff *copy_skb = NULL;
2145 bool is_drop_n_account = false;
2147 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
2148 * We may add members to them until current aligned size without forcing
2149 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
2151 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
2152 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
2154 if (skb->pkt_type == PACKET_LOOPBACK)
2157 sk = pt->af_packet_priv;
2160 if (!net_eq(dev_net(dev), sock_net(sk)))
2163 if (dev->header_ops) {
2164 if (sk->sk_type != SOCK_DGRAM)
2165 skb_push(skb, skb->data - skb_mac_header(skb));
2166 else if (skb->pkt_type == PACKET_OUTGOING) {
2167 /* Special case: outgoing packets have ll header at head */
2168 skb_pull(skb, skb_network_offset(skb));
2174 res = run_filter(skb, sk, snaplen);
2176 goto drop_n_restore;
2178 if (skb->ip_summed == CHECKSUM_PARTIAL)
2179 status |= TP_STATUS_CSUMNOTREADY;
2180 else if (skb->pkt_type != PACKET_OUTGOING &&
2181 (skb->ip_summed == CHECKSUM_COMPLETE ||
2182 skb_csum_unnecessary(skb)))
2183 status |= TP_STATUS_CSUM_VALID;
2188 if (sk->sk_type == SOCK_DGRAM) {
2189 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
2192 unsigned int maclen = skb_network_offset(skb);
2193 netoff = TPACKET_ALIGN(po->tp_hdrlen +
2194 (maclen < 16 ? 16 : maclen)) +
2196 if (po->has_vnet_hdr)
2197 netoff += sizeof(struct virtio_net_hdr);
2198 macoff = netoff - maclen;
2200 if (po->tp_version <= TPACKET_V2) {
2201 if (macoff + snaplen > po->rx_ring.frame_size) {
2202 if (po->copy_thresh &&
2203 atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
2204 if (skb_shared(skb)) {
2205 copy_skb = skb_clone(skb, GFP_ATOMIC);
2207 copy_skb = skb_get(skb);
2208 skb_head = skb->data;
2211 skb_set_owner_r(copy_skb, sk);
2213 snaplen = po->rx_ring.frame_size - macoff;
2214 if ((int)snaplen < 0)
2217 } else if (unlikely(macoff + snaplen >
2218 GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) {
2221 nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff;
2222 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
2223 snaplen, nval, macoff);
2225 if (unlikely((int)snaplen < 0)) {
2227 macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len;
2230 spin_lock(&sk->sk_receive_queue.lock);
2231 h.raw = packet_current_rx_frame(po, skb,
2232 TP_STATUS_KERNEL, (macoff+snaplen));
2234 goto drop_n_account;
2235 if (po->tp_version <= TPACKET_V2) {
2236 packet_increment_rx_head(po, &po->rx_ring);
2238 * LOSING will be reported till you read the stats,
2239 * because it's COR - Clear On Read.
2240 * Anyways, moving it for V1/V2 only as V3 doesn't need this
2243 if (po->stats.stats1.tp_drops)
2244 status |= TP_STATUS_LOSING;
2246 po->stats.stats1.tp_packets++;
2248 status |= TP_STATUS_COPY;
2249 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
2251 spin_unlock(&sk->sk_receive_queue.lock);
2253 if (po->has_vnet_hdr) {
2254 if (__packet_rcv_vnet(skb, h.raw + macoff -
2255 sizeof(struct virtio_net_hdr))) {
2256 spin_lock(&sk->sk_receive_queue.lock);
2257 goto drop_n_account;
2261 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
2263 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
2264 getnstimeofday(&ts);
2266 status |= ts_status;
2268 switch (po->tp_version) {
2270 h.h1->tp_len = skb->len;
2271 h.h1->tp_snaplen = snaplen;
2272 h.h1->tp_mac = macoff;
2273 h.h1->tp_net = netoff;
2274 h.h1->tp_sec = ts.tv_sec;
2275 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
2276 hdrlen = sizeof(*h.h1);
2279 h.h2->tp_len = skb->len;
2280 h.h2->tp_snaplen = snaplen;
2281 h.h2->tp_mac = macoff;
2282 h.h2->tp_net = netoff;
2283 h.h2->tp_sec = ts.tv_sec;
2284 h.h2->tp_nsec = ts.tv_nsec;
2285 if (skb_vlan_tag_present(skb)) {
2286 h.h2->tp_vlan_tci = skb_vlan_tag_get(skb);
2287 h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto);
2288 status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
2290 h.h2->tp_vlan_tci = 0;
2291 h.h2->tp_vlan_tpid = 0;
2293 memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding));
2294 hdrlen = sizeof(*h.h2);
2297 /* tp_nxt_offset,vlan are already populated above.
2298 * So DONT clear those fields here
2300 h.h3->tp_status |= status;
2301 h.h3->tp_len = skb->len;
2302 h.h3->tp_snaplen = snaplen;
2303 h.h3->tp_mac = macoff;
2304 h.h3->tp_net = netoff;
2305 h.h3->tp_sec = ts.tv_sec;
2306 h.h3->tp_nsec = ts.tv_nsec;
2307 memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding));
2308 hdrlen = sizeof(*h.h3);
2314 sll = h.raw + TPACKET_ALIGN(hdrlen);
2315 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2316 sll->sll_family = AF_PACKET;
2317 sll->sll_hatype = dev->type;
2318 sll->sll_protocol = skb->protocol;
2319 sll->sll_pkttype = skb->pkt_type;
2320 if (unlikely(po->origdev))
2321 sll->sll_ifindex = orig_dev->ifindex;
2323 sll->sll_ifindex = dev->ifindex;
2327 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
2328 if (po->tp_version <= TPACKET_V2) {
2331 end = (u8 *) PAGE_ALIGN((unsigned long) h.raw +
2334 for (start = h.raw; start < end; start += PAGE_SIZE)
2335 flush_dcache_page(pgv_to_page(start));
2340 if (po->tp_version <= TPACKET_V2) {
2341 __packet_set_status(po, h.raw, status);
2342 sk->sk_data_ready(sk);
2344 prb_clear_blk_fill_status(&po->rx_ring);
2348 if (skb_head != skb->data && skb_shared(skb)) {
2349 skb->data = skb_head;
2353 if (!is_drop_n_account)
2360 is_drop_n_account = true;
2361 po->stats.stats1.tp_drops++;
2362 spin_unlock(&sk->sk_receive_queue.lock);
2364 sk->sk_data_ready(sk);
2365 kfree_skb(copy_skb);
2366 goto drop_n_restore;
2369 static void tpacket_destruct_skb(struct sk_buff *skb)
2371 struct packet_sock *po = pkt_sk(skb->sk);
2373 if (likely(po->tx_ring.pg_vec)) {
2377 ph = skb_shinfo(skb)->destructor_arg;
2378 packet_dec_pending(&po->tx_ring);
2380 ts = __packet_set_timestamp(po, ph, skb);
2381 __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts);
2387 static void tpacket_set_protocol(const struct net_device *dev,
2388 struct sk_buff *skb)
2390 if (dev->type == ARPHRD_ETHER) {
2391 skb_reset_mac_header(skb);
2392 skb->protocol = eth_hdr(skb)->h_proto;
2396 static int __packet_snd_vnet_parse(struct virtio_net_hdr *vnet_hdr, size_t len)
2398 unsigned short gso_type = 0;
2400 if ((vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
2401 (__virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2402 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2 >
2403 __virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len)))
2404 vnet_hdr->hdr_len = __cpu_to_virtio16(vio_le(),
2405 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2406 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2);
2408 if (__virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len) > len)
2411 if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2412 switch (vnet_hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2413 case VIRTIO_NET_HDR_GSO_TCPV4:
2414 gso_type = SKB_GSO_TCPV4;
2416 case VIRTIO_NET_HDR_GSO_TCPV6:
2417 gso_type = SKB_GSO_TCPV6;
2419 case VIRTIO_NET_HDR_GSO_UDP:
2420 gso_type = SKB_GSO_UDP;
2426 if (vnet_hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
2427 gso_type |= SKB_GSO_TCP_ECN;
2429 if (vnet_hdr->gso_size == 0)
2433 vnet_hdr->gso_type = gso_type; /* changes type, temporary storage */
2437 static int packet_snd_vnet_parse(struct msghdr *msg, size_t *len,
2438 struct virtio_net_hdr *vnet_hdr)
2442 if (*len < sizeof(*vnet_hdr))
2444 *len -= sizeof(*vnet_hdr);
2446 n = copy_from_iter(vnet_hdr, sizeof(*vnet_hdr), &msg->msg_iter);
2447 if (n != sizeof(*vnet_hdr))
2450 return __packet_snd_vnet_parse(vnet_hdr, *len);
2453 static int packet_snd_vnet_gso(struct sk_buff *skb,
2454 struct virtio_net_hdr *vnet_hdr)
2456 if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
2457 u16 s = __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start);
2458 u16 o = __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset);
2460 if (!skb_partial_csum_set(skb, s, o))
2464 skb_shinfo(skb)->gso_size =
2465 __virtio16_to_cpu(vio_le(), vnet_hdr->gso_size);
2466 skb_shinfo(skb)->gso_type = vnet_hdr->gso_type;
2468 /* Header must be checked, and gso_segs computed. */
2469 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2470 skb_shinfo(skb)->gso_segs = 0;
2474 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
2475 void *frame, struct net_device *dev, void *data, int tp_len,
2476 __be16 proto, unsigned char *addr, int hlen, int copylen,
2477 const struct sockcm_cookie *sockc)
2479 union tpacket_uhdr ph;
2480 int to_write, offset, len, nr_frags, len_max;
2481 struct socket *sock = po->sk.sk_socket;
2487 skb->protocol = proto;
2489 skb->priority = po->sk.sk_priority;
2490 skb->mark = po->sk.sk_mark;
2491 sock_tx_timestamp(&po->sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags);
2492 skb_shinfo(skb)->destructor_arg = ph.raw;
2494 skb_reserve(skb, hlen);
2495 skb_reset_network_header(skb);
2499 if (sock->type == SOCK_DGRAM) {
2500 err = dev_hard_header(skb, dev, ntohs(proto), addr,
2502 if (unlikely(err < 0))
2504 } else if (copylen) {
2505 int hdrlen = min_t(int, copylen, tp_len);
2507 skb_push(skb, dev->hard_header_len);
2508 skb_put(skb, copylen - dev->hard_header_len);
2509 err = skb_store_bits(skb, 0, data, hdrlen);
2512 if (!dev_validate_header(dev, skb->data, hdrlen))
2515 tpacket_set_protocol(dev, skb);
2521 offset = offset_in_page(data);
2522 len_max = PAGE_SIZE - offset;
2523 len = ((to_write > len_max) ? len_max : to_write);
2525 skb->data_len = to_write;
2526 skb->len += to_write;
2527 skb->truesize += to_write;
2528 atomic_add(to_write, &po->sk.sk_wmem_alloc);
2530 while (likely(to_write)) {
2531 nr_frags = skb_shinfo(skb)->nr_frags;
2533 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
2534 pr_err("Packet exceed the number of skb frags(%lu)\n",
2539 page = pgv_to_page(data);
2541 flush_dcache_page(page);
2543 skb_fill_page_desc(skb, nr_frags, page, offset, len);
2546 len_max = PAGE_SIZE;
2547 len = ((to_write > len_max) ? len_max : to_write);
2550 skb_probe_transport_header(skb, 0);
2555 static int tpacket_parse_header(struct packet_sock *po, void *frame,
2556 int size_max, void **data)
2558 union tpacket_uhdr ph;
2563 switch (po->tp_version) {
2565 tp_len = ph.h2->tp_len;
2568 tp_len = ph.h1->tp_len;
2571 if (unlikely(tp_len > size_max)) {
2572 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
2576 if (unlikely(po->tp_tx_has_off)) {
2577 int off_min, off_max;
2579 off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2580 off_max = po->tx_ring.frame_size - tp_len;
2581 if (po->sk.sk_type == SOCK_DGRAM) {
2582 switch (po->tp_version) {
2584 off = ph.h2->tp_net;
2587 off = ph.h1->tp_net;
2591 switch (po->tp_version) {
2593 off = ph.h2->tp_mac;
2596 off = ph.h1->tp_mac;
2600 if (unlikely((off < off_min) || (off_max < off)))
2603 off = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2606 *data = frame + off;
2610 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
2612 struct sk_buff *skb;
2613 struct net_device *dev;
2614 struct virtio_net_hdr *vnet_hdr = NULL;
2615 struct sockcm_cookie sockc;
2617 int err, reserve = 0;
2619 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2620 bool need_wait = !(msg->msg_flags & MSG_DONTWAIT);
2621 int tp_len, size_max;
2622 unsigned char *addr;
2625 int status = TP_STATUS_AVAILABLE;
2626 int hlen, tlen, copylen = 0;
2628 mutex_lock(&po->pg_vec_lock);
2630 if (likely(saddr == NULL)) {
2631 dev = packet_cached_dev_get(po);
2636 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2638 if (msg->msg_namelen < (saddr->sll_halen
2639 + offsetof(struct sockaddr_ll,
2642 proto = saddr->sll_protocol;
2643 addr = saddr->sll_addr;
2644 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
2647 sockc.tsflags = po->sk.sk_tsflags;
2648 if (msg->msg_controllen) {
2649 err = sock_cmsg_send(&po->sk, msg, &sockc);
2655 if (unlikely(dev == NULL))
2658 if (unlikely(!(dev->flags & IFF_UP)))
2661 if (po->sk.sk_socket->type == SOCK_RAW)
2662 reserve = dev->hard_header_len;
2663 size_max = po->tx_ring.frame_size
2664 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
2666 if ((size_max > dev->mtu + reserve + VLAN_HLEN) && !po->has_vnet_hdr)
2667 size_max = dev->mtu + reserve + VLAN_HLEN;
2670 ph = packet_current_frame(po, &po->tx_ring,
2671 TP_STATUS_SEND_REQUEST);
2672 if (unlikely(ph == NULL)) {
2673 if (need_wait && need_resched())
2679 tp_len = tpacket_parse_header(po, ph, size_max, &data);
2683 status = TP_STATUS_SEND_REQUEST;
2684 hlen = LL_RESERVED_SPACE(dev);
2685 tlen = dev->needed_tailroom;
2686 if (po->has_vnet_hdr) {
2688 data += sizeof(*vnet_hdr);
2689 tp_len -= sizeof(*vnet_hdr);
2691 __packet_snd_vnet_parse(vnet_hdr, tp_len)) {
2695 copylen = __virtio16_to_cpu(vio_le(),
2698 copylen = max_t(int, copylen, dev->hard_header_len);
2699 skb = sock_alloc_send_skb(&po->sk,
2700 hlen + tlen + sizeof(struct sockaddr_ll) +
2701 (copylen - dev->hard_header_len),
2704 if (unlikely(skb == NULL)) {
2705 /* we assume the socket was initially writeable ... */
2706 if (likely(len_sum > 0))
2710 tp_len = tpacket_fill_skb(po, skb, ph, dev, data, tp_len, proto,
2711 addr, hlen, copylen, &sockc);
2712 if (likely(tp_len >= 0) &&
2713 tp_len > dev->mtu + reserve &&
2714 !po->has_vnet_hdr &&
2715 !packet_extra_vlan_len_allowed(dev, skb))
2718 if (unlikely(tp_len < 0)) {
2721 __packet_set_status(po, ph,
2722 TP_STATUS_AVAILABLE);
2723 packet_increment_head(&po->tx_ring);
2727 status = TP_STATUS_WRONG_FORMAT;
2733 if (po->has_vnet_hdr && packet_snd_vnet_gso(skb, vnet_hdr)) {
2738 packet_pick_tx_queue(dev, skb);
2740 skb->destructor = tpacket_destruct_skb;
2741 __packet_set_status(po, ph, TP_STATUS_SENDING);
2742 packet_inc_pending(&po->tx_ring);
2744 status = TP_STATUS_SEND_REQUEST;
2745 err = po->xmit(skb);
2746 if (unlikely(err > 0)) {
2747 err = net_xmit_errno(err);
2748 if (err && __packet_get_status(po, ph) ==
2749 TP_STATUS_AVAILABLE) {
2750 /* skb was destructed already */
2755 * skb was dropped but not destructed yet;
2756 * let's treat it like congestion or err < 0
2760 packet_increment_head(&po->tx_ring);
2762 } while (likely((ph != NULL) ||
2763 /* Note: packet_read_pending() might be slow if we have
2764 * to call it as it's per_cpu variable, but in fast-path
2765 * we already short-circuit the loop with the first
2766 * condition, and luckily don't have to go that path
2769 (need_wait && packet_read_pending(&po->tx_ring))));
2775 __packet_set_status(po, ph, status);
2780 mutex_unlock(&po->pg_vec_lock);
2784 static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
2785 size_t reserve, size_t len,
2786 size_t linear, int noblock,
2789 struct sk_buff *skb;
2791 /* Under a page? Don't bother with paged skb. */
2792 if (prepad + len < PAGE_SIZE || !linear)
2795 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
2800 skb_reserve(skb, reserve);
2801 skb_put(skb, linear);
2802 skb->data_len = len - linear;
2803 skb->len += len - linear;
2808 static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
2810 struct sock *sk = sock->sk;
2811 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2812 struct sk_buff *skb;
2813 struct net_device *dev;
2815 unsigned char *addr;
2816 int err, reserve = 0;
2817 struct sockcm_cookie sockc;
2818 struct virtio_net_hdr vnet_hdr = { 0 };
2820 struct packet_sock *po = pkt_sk(sk);
2821 int hlen, tlen, linear;
2825 * Get and verify the address.
2828 if (likely(saddr == NULL)) {
2829 dev = packet_cached_dev_get(po);
2834 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2836 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
2838 proto = saddr->sll_protocol;
2839 addr = saddr->sll_addr;
2840 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
2844 if (unlikely(dev == NULL))
2847 if (unlikely(!(dev->flags & IFF_UP)))
2850 sockc.tsflags = sk->sk_tsflags;
2851 sockc.mark = sk->sk_mark;
2852 if (msg->msg_controllen) {
2853 err = sock_cmsg_send(sk, msg, &sockc);
2858 if (sock->type == SOCK_RAW)
2859 reserve = dev->hard_header_len;
2860 if (po->has_vnet_hdr) {
2861 err = packet_snd_vnet_parse(msg, &len, &vnet_hdr);
2866 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
2867 if (!netif_supports_nofcs(dev)) {
2868 err = -EPROTONOSUPPORT;
2871 extra_len = 4; /* We're doing our own CRC */
2875 if (!vnet_hdr.gso_type &&
2876 (len > dev->mtu + reserve + VLAN_HLEN + extra_len))
2880 hlen = LL_RESERVED_SPACE(dev);
2881 tlen = dev->needed_tailroom;
2882 linear = __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len);
2883 linear = max(linear, min_t(int, len, dev->hard_header_len));
2884 skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, linear,
2885 msg->msg_flags & MSG_DONTWAIT, &err);
2889 skb_set_network_header(skb, reserve);
2892 if (sock->type == SOCK_DGRAM) {
2893 offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len);
2894 if (unlikely(offset < 0))
2898 /* Returns -EFAULT on error */
2899 err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len);
2903 if (sock->type == SOCK_RAW &&
2904 !dev_validate_header(dev, skb->data, len)) {
2909 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
2911 if (!vnet_hdr.gso_type && (len > dev->mtu + reserve + extra_len) &&
2912 !packet_extra_vlan_len_allowed(dev, skb)) {
2917 skb->protocol = proto;
2919 skb->priority = sk->sk_priority;
2920 skb->mark = sockc.mark;
2922 packet_pick_tx_queue(dev, skb);
2924 if (po->has_vnet_hdr) {
2925 err = packet_snd_vnet_gso(skb, &vnet_hdr);
2928 len += sizeof(vnet_hdr);
2931 skb_probe_transport_header(skb, reserve);
2933 if (unlikely(extra_len == 4))
2936 err = po->xmit(skb);
2937 if (err > 0 && (err = net_xmit_errno(err)) != 0)
2953 static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2955 struct sock *sk = sock->sk;
2956 struct packet_sock *po = pkt_sk(sk);
2958 if (po->tx_ring.pg_vec)
2959 return tpacket_snd(po, msg);
2961 return packet_snd(sock, msg, len);
2965 * Close a PACKET socket. This is fairly simple. We immediately go
2966 * to 'closed' state and remove our protocol entry in the device list.
2969 static int packet_release(struct socket *sock)
2971 struct sock *sk = sock->sk;
2972 struct packet_sock *po;
2974 union tpacket_req_u req_u;
2982 mutex_lock(&net->packet.sklist_lock);
2983 sk_del_node_init_rcu(sk);
2984 mutex_unlock(&net->packet.sklist_lock);
2987 sock_prot_inuse_add(net, sk->sk_prot, -1);
2990 spin_lock(&po->bind_lock);
2991 unregister_prot_hook(sk, false);
2992 packet_cached_dev_reset(po);
2994 if (po->prot_hook.dev) {
2995 dev_put(po->prot_hook.dev);
2996 po->prot_hook.dev = NULL;
2998 spin_unlock(&po->bind_lock);
3000 packet_flush_mclist(sk);
3002 if (po->rx_ring.pg_vec) {
3003 memset(&req_u, 0, sizeof(req_u));
3004 packet_set_ring(sk, &req_u, 1, 0);
3007 if (po->tx_ring.pg_vec) {
3008 memset(&req_u, 0, sizeof(req_u));
3009 packet_set_ring(sk, &req_u, 1, 1);
3016 * Now the socket is dead. No more input will appear.
3023 skb_queue_purge(&sk->sk_receive_queue);
3024 packet_free_pending(po);
3025 sk_refcnt_debug_release(sk);
3032 * Attach a packet hook.
3035 static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
3038 struct packet_sock *po = pkt_sk(sk);
3039 struct net_device *dev_curr;
3042 struct net_device *dev = NULL;
3044 bool unlisted = false;
3050 spin_lock(&po->bind_lock);
3054 dev = dev_get_by_name_rcu(sock_net(sk), name);
3059 } else if (ifindex) {
3060 dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
3070 proto_curr = po->prot_hook.type;
3071 dev_curr = po->prot_hook.dev;
3073 need_rehook = proto_curr != proto || dev_curr != dev;
3078 __unregister_prot_hook(sk, true);
3080 dev_curr = po->prot_hook.dev;
3082 unlisted = !dev_get_by_index_rcu(sock_net(sk),
3087 po->prot_hook.type = proto;
3089 if (unlikely(unlisted)) {
3091 po->prot_hook.dev = NULL;
3093 packet_cached_dev_reset(po);
3095 po->prot_hook.dev = dev;
3096 po->ifindex = dev ? dev->ifindex : 0;
3097 packet_cached_dev_assign(po, dev);
3103 if (proto == 0 || !need_rehook)
3106 if (!unlisted && (!dev || (dev->flags & IFF_UP))) {
3107 register_prot_hook(sk);
3109 sk->sk_err = ENETDOWN;
3110 if (!sock_flag(sk, SOCK_DEAD))
3111 sk->sk_error_report(sk);
3116 spin_unlock(&po->bind_lock);
3122 * Bind a packet socket to a device
3125 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
3128 struct sock *sk = sock->sk;
3135 if (addr_len != sizeof(struct sockaddr))
3137 strlcpy(name, uaddr->sa_data, sizeof(name));
3139 return packet_do_bind(sk, name, 0, pkt_sk(sk)->num);
3142 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
3144 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
3145 struct sock *sk = sock->sk;
3151 if (addr_len < sizeof(struct sockaddr_ll))
3153 if (sll->sll_family != AF_PACKET)
3156 return packet_do_bind(sk, NULL, sll->sll_ifindex,
3157 sll->sll_protocol ? : pkt_sk(sk)->num);
3160 static struct proto packet_proto = {
3162 .owner = THIS_MODULE,
3163 .obj_size = sizeof(struct packet_sock),
3167 * Create a packet of type SOCK_PACKET.
3170 static int packet_create(struct net *net, struct socket *sock, int protocol,
3174 struct packet_sock *po;
3175 __be16 proto = (__force __be16)protocol; /* weird, but documented */
3178 if (!ns_capable(net->user_ns, CAP_NET_RAW))
3180 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
3181 sock->type != SOCK_PACKET)
3182 return -ESOCKTNOSUPPORT;
3184 sock->state = SS_UNCONNECTED;
3187 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto, kern);
3191 sock->ops = &packet_ops;
3192 if (sock->type == SOCK_PACKET)
3193 sock->ops = &packet_ops_spkt;
3195 sock_init_data(sock, sk);
3198 sk->sk_family = PF_PACKET;
3200 po->xmit = dev_queue_xmit;
3202 err = packet_alloc_pending(po);
3206 packet_cached_dev_reset(po);
3208 sk->sk_destruct = packet_sock_destruct;
3209 sk_refcnt_debug_inc(sk);
3212 * Attach a protocol block
3215 spin_lock_init(&po->bind_lock);
3216 mutex_init(&po->pg_vec_lock);
3217 po->rollover = NULL;
3218 po->prot_hook.func = packet_rcv;
3220 if (sock->type == SOCK_PACKET)
3221 po->prot_hook.func = packet_rcv_spkt;
3223 po->prot_hook.af_packet_priv = sk;
3226 po->prot_hook.type = proto;
3227 register_prot_hook(sk);
3230 mutex_lock(&net->packet.sklist_lock);
3231 sk_add_node_rcu(sk, &net->packet.sklist);
3232 mutex_unlock(&net->packet.sklist_lock);
3235 sock_prot_inuse_add(net, &packet_proto, 1);
3246 * Pull a packet from our receive queue and hand it to the user.
3247 * If necessary we block.
3250 static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3253 struct sock *sk = sock->sk;
3254 struct sk_buff *skb;
3256 int vnet_hdr_len = 0;
3257 unsigned int origlen = 0;
3260 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
3264 /* What error should we return now? EUNATTACH? */
3265 if (pkt_sk(sk)->ifindex < 0)
3269 if (flags & MSG_ERRQUEUE) {
3270 err = sock_recv_errqueue(sk, msg, len,
3271 SOL_PACKET, PACKET_TX_TIMESTAMP);
3276 * Call the generic datagram receiver. This handles all sorts
3277 * of horrible races and re-entrancy so we can forget about it
3278 * in the protocol layers.
3280 * Now it will return ENETDOWN, if device have just gone down,
3281 * but then it will block.
3284 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3287 * An error occurred so return it. Because skb_recv_datagram()
3288 * handles the blocking we don't see and worry about blocking
3295 if (pkt_sk(sk)->pressure)
3296 packet_rcv_has_room(pkt_sk(sk), NULL);
3298 if (pkt_sk(sk)->has_vnet_hdr) {
3299 err = packet_rcv_vnet(msg, skb, &len);
3302 vnet_hdr_len = sizeof(struct virtio_net_hdr);
3305 /* You lose any data beyond the buffer you gave. If it worries
3306 * a user program they can ask the device for its MTU
3312 msg->msg_flags |= MSG_TRUNC;
3315 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3319 if (sock->type != SOCK_PACKET) {
3320 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3322 /* Original length was stored in sockaddr_ll fields */
3323 origlen = PACKET_SKB_CB(skb)->sa.origlen;
3324 sll->sll_family = AF_PACKET;
3325 sll->sll_protocol = skb->protocol;
3328 sock_recv_ts_and_drops(msg, sk, skb);
3330 if (msg->msg_name) {
3331 /* If the address length field is there to be filled
3332 * in, we fill it in now.
3334 if (sock->type == SOCK_PACKET) {
3335 __sockaddr_check_size(sizeof(struct sockaddr_pkt));
3336 msg->msg_namelen = sizeof(struct sockaddr_pkt);
3338 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3340 msg->msg_namelen = sll->sll_halen +
3341 offsetof(struct sockaddr_ll, sll_addr);
3343 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
3347 if (pkt_sk(sk)->auxdata) {
3348 struct tpacket_auxdata aux;
3350 aux.tp_status = TP_STATUS_USER;
3351 if (skb->ip_summed == CHECKSUM_PARTIAL)
3352 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
3353 else if (skb->pkt_type != PACKET_OUTGOING &&
3354 (skb->ip_summed == CHECKSUM_COMPLETE ||
3355 skb_csum_unnecessary(skb)))
3356 aux.tp_status |= TP_STATUS_CSUM_VALID;
3358 aux.tp_len = origlen;
3359 aux.tp_snaplen = skb->len;
3361 aux.tp_net = skb_network_offset(skb);
3362 if (skb_vlan_tag_present(skb)) {
3363 aux.tp_vlan_tci = skb_vlan_tag_get(skb);
3364 aux.tp_vlan_tpid = ntohs(skb->vlan_proto);
3365 aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
3367 aux.tp_vlan_tci = 0;
3368 aux.tp_vlan_tpid = 0;
3370 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
3374 * Free or return the buffer as appropriate. Again this
3375 * hides all the races and re-entrancy issues from us.
3377 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
3380 skb_free_datagram(sk, skb);
3385 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
3386 int *uaddr_len, int peer)
3388 struct net_device *dev;
3389 struct sock *sk = sock->sk;
3394 uaddr->sa_family = AF_PACKET;
3395 memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
3397 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
3399 strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
3401 *uaddr_len = sizeof(*uaddr);
3406 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
3407 int *uaddr_len, int peer)
3409 struct net_device *dev;
3410 struct sock *sk = sock->sk;
3411 struct packet_sock *po = pkt_sk(sk);
3412 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
3417 sll->sll_family = AF_PACKET;
3418 sll->sll_ifindex = po->ifindex;
3419 sll->sll_protocol = po->num;
3420 sll->sll_pkttype = 0;
3422 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
3424 sll->sll_hatype = dev->type;
3425 sll->sll_halen = dev->addr_len;
3426 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
3428 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
3432 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
3437 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
3441 case PACKET_MR_MULTICAST:
3442 if (i->alen != dev->addr_len)
3445 return dev_mc_add(dev, i->addr);
3447 return dev_mc_del(dev, i->addr);
3449 case PACKET_MR_PROMISC:
3450 return dev_set_promiscuity(dev, what);
3451 case PACKET_MR_ALLMULTI:
3452 return dev_set_allmulti(dev, what);
3453 case PACKET_MR_UNICAST:
3454 if (i->alen != dev->addr_len)
3457 return dev_uc_add(dev, i->addr);
3459 return dev_uc_del(dev, i->addr);
3467 static void packet_dev_mclist_delete(struct net_device *dev,
3468 struct packet_mclist **mlp)
3470 struct packet_mclist *ml;
3472 while ((ml = *mlp) != NULL) {
3473 if (ml->ifindex == dev->ifindex) {
3474 packet_dev_mc(dev, ml, -1);
3482 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
3484 struct packet_sock *po = pkt_sk(sk);
3485 struct packet_mclist *ml, *i;
3486 struct net_device *dev;
3492 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
3497 if (mreq->mr_alen > dev->addr_len)
3501 i = kmalloc(sizeof(*i), GFP_KERNEL);
3506 for (ml = po->mclist; ml; ml = ml->next) {
3507 if (ml->ifindex == mreq->mr_ifindex &&
3508 ml->type == mreq->mr_type &&
3509 ml->alen == mreq->mr_alen &&
3510 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3512 /* Free the new element ... */
3518 i->type = mreq->mr_type;
3519 i->ifindex = mreq->mr_ifindex;
3520 i->alen = mreq->mr_alen;
3521 memcpy(i->addr, mreq->mr_address, i->alen);
3522 memset(i->addr + i->alen, 0, sizeof(i->addr) - i->alen);
3524 i->next = po->mclist;
3526 err = packet_dev_mc(dev, i, 1);
3528 po->mclist = i->next;
3537 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
3539 struct packet_mclist *ml, **mlp;
3543 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
3544 if (ml->ifindex == mreq->mr_ifindex &&
3545 ml->type == mreq->mr_type &&
3546 ml->alen == mreq->mr_alen &&
3547 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3548 if (--ml->count == 0) {
3549 struct net_device *dev;
3551 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3553 packet_dev_mc(dev, ml, -1);
3563 static void packet_flush_mclist(struct sock *sk)
3565 struct packet_sock *po = pkt_sk(sk);
3566 struct packet_mclist *ml;
3572 while ((ml = po->mclist) != NULL) {
3573 struct net_device *dev;
3575 po->mclist = ml->next;
3576 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3578 packet_dev_mc(dev, ml, -1);
3585 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
3587 struct sock *sk = sock->sk;
3588 struct packet_sock *po = pkt_sk(sk);
3591 if (level != SOL_PACKET)
3592 return -ENOPROTOOPT;
3595 case PACKET_ADD_MEMBERSHIP:
3596 case PACKET_DROP_MEMBERSHIP:
3598 struct packet_mreq_max mreq;
3600 memset(&mreq, 0, sizeof(mreq));
3601 if (len < sizeof(struct packet_mreq))
3603 if (len > sizeof(mreq))
3605 if (copy_from_user(&mreq, optval, len))
3607 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
3609 if (optname == PACKET_ADD_MEMBERSHIP)
3610 ret = packet_mc_add(sk, &mreq);
3612 ret = packet_mc_drop(sk, &mreq);
3616 case PACKET_RX_RING:
3617 case PACKET_TX_RING:
3619 union tpacket_req_u req_u;
3622 switch (po->tp_version) {
3625 len = sizeof(req_u.req);
3629 len = sizeof(req_u.req3);
3634 if (copy_from_user(&req_u.req, optval, len))
3636 return packet_set_ring(sk, &req_u, 0,
3637 optname == PACKET_TX_RING);
3639 case PACKET_COPY_THRESH:
3643 if (optlen != sizeof(val))
3645 if (copy_from_user(&val, optval, sizeof(val)))
3648 pkt_sk(sk)->copy_thresh = val;
3651 case PACKET_VERSION:
3655 if (optlen != sizeof(val))
3657 if (copy_from_user(&val, optval, sizeof(val)))
3668 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3671 po->tp_version = val;
3677 case PACKET_RESERVE:
3681 if (optlen != sizeof(val))
3683 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3685 if (copy_from_user(&val, optval, sizeof(val)))
3687 po->tp_reserve = val;
3694 if (optlen != sizeof(val))
3696 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3698 if (copy_from_user(&val, optval, sizeof(val)))
3700 po->tp_loss = !!val;
3703 case PACKET_AUXDATA:
3707 if (optlen < sizeof(val))
3709 if (copy_from_user(&val, optval, sizeof(val)))
3712 po->auxdata = !!val;
3715 case PACKET_ORIGDEV:
3719 if (optlen < sizeof(val))
3721 if (copy_from_user(&val, optval, sizeof(val)))
3724 po->origdev = !!val;
3727 case PACKET_VNET_HDR:
3731 if (sock->type != SOCK_RAW)
3733 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3735 if (optlen < sizeof(val))
3737 if (copy_from_user(&val, optval, sizeof(val)))
3740 po->has_vnet_hdr = !!val;
3743 case PACKET_TIMESTAMP:
3747 if (optlen != sizeof(val))
3749 if (copy_from_user(&val, optval, sizeof(val)))
3752 po->tp_tstamp = val;
3759 if (optlen != sizeof(val))
3761 if (copy_from_user(&val, optval, sizeof(val)))
3764 return fanout_add(sk, val & 0xffff, val >> 16);
3766 case PACKET_FANOUT_DATA:
3771 return fanout_set_data(po, optval, optlen);
3773 case PACKET_TX_HAS_OFF:
3777 if (optlen != sizeof(val))
3779 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3781 if (copy_from_user(&val, optval, sizeof(val)))
3783 po->tp_tx_has_off = !!val;
3786 case PACKET_QDISC_BYPASS:
3790 if (optlen != sizeof(val))
3792 if (copy_from_user(&val, optval, sizeof(val)))
3795 po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
3799 return -ENOPROTOOPT;
3803 static int packet_getsockopt(struct socket *sock, int level, int optname,
3804 char __user *optval, int __user *optlen)
3807 int val, lv = sizeof(val);
3808 struct sock *sk = sock->sk;
3809 struct packet_sock *po = pkt_sk(sk);
3811 union tpacket_stats_u st;
3812 struct tpacket_rollover_stats rstats;
3814 if (level != SOL_PACKET)
3815 return -ENOPROTOOPT;
3817 if (get_user(len, optlen))
3824 case PACKET_STATISTICS:
3825 spin_lock_bh(&sk->sk_receive_queue.lock);
3826 memcpy(&st, &po->stats, sizeof(st));
3827 memset(&po->stats, 0, sizeof(po->stats));
3828 spin_unlock_bh(&sk->sk_receive_queue.lock);
3830 if (po->tp_version == TPACKET_V3) {
3831 lv = sizeof(struct tpacket_stats_v3);
3832 st.stats3.tp_packets += st.stats3.tp_drops;
3835 lv = sizeof(struct tpacket_stats);
3836 st.stats1.tp_packets += st.stats1.tp_drops;
3841 case PACKET_AUXDATA:
3844 case PACKET_ORIGDEV:
3847 case PACKET_VNET_HDR:
3848 val = po->has_vnet_hdr;
3850 case PACKET_VERSION:
3851 val = po->tp_version;
3854 if (len > sizeof(int))
3856 if (copy_from_user(&val, optval, len))
3860 val = sizeof(struct tpacket_hdr);
3863 val = sizeof(struct tpacket2_hdr);
3866 val = sizeof(struct tpacket3_hdr);
3872 case PACKET_RESERVE:
3873 val = po->tp_reserve;
3878 case PACKET_TIMESTAMP:
3879 val = po->tp_tstamp;
3883 ((u32)po->fanout->id |
3884 ((u32)po->fanout->type << 16) |
3885 ((u32)po->fanout->flags << 24)) :
3888 case PACKET_ROLLOVER_STATS:
3891 rstats.tp_all = atomic_long_read(&po->rollover->num);
3892 rstats.tp_huge = atomic_long_read(&po->rollover->num_huge);
3893 rstats.tp_failed = atomic_long_read(&po->rollover->num_failed);
3895 lv = sizeof(rstats);
3897 case PACKET_TX_HAS_OFF:
3898 val = po->tp_tx_has_off;
3900 case PACKET_QDISC_BYPASS:
3901 val = packet_use_direct_xmit(po);
3904 return -ENOPROTOOPT;
3909 if (put_user(len, optlen))
3911 if (copy_to_user(optval, data, len))
3917 #ifdef CONFIG_COMPAT
3918 static int compat_packet_setsockopt(struct socket *sock, int level, int optname,
3919 char __user *optval, unsigned int optlen)
3921 struct packet_sock *po = pkt_sk(sock->sk);
3923 if (level != SOL_PACKET)
3924 return -ENOPROTOOPT;
3926 if (optname == PACKET_FANOUT_DATA &&
3927 po->fanout && po->fanout->type == PACKET_FANOUT_CBPF) {
3928 optval = (char __user *)get_compat_bpf_fprog(optval);
3931 optlen = sizeof(struct sock_fprog);
3934 return packet_setsockopt(sock, level, optname, optval, optlen);
3938 static int packet_notifier(struct notifier_block *this,
3939 unsigned long msg, void *ptr)
3942 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3943 struct net *net = dev_net(dev);
3946 sk_for_each_rcu(sk, &net->packet.sklist) {
3947 struct packet_sock *po = pkt_sk(sk);
3950 case NETDEV_UNREGISTER:
3952 packet_dev_mclist_delete(dev, &po->mclist);
3956 if (dev->ifindex == po->ifindex) {
3957 spin_lock(&po->bind_lock);
3959 __unregister_prot_hook(sk, false);
3960 sk->sk_err = ENETDOWN;
3961 if (!sock_flag(sk, SOCK_DEAD))
3962 sk->sk_error_report(sk);
3964 if (msg == NETDEV_UNREGISTER) {
3965 packet_cached_dev_reset(po);
3968 if (po->prot_hook.dev)
3969 dev_put(po->prot_hook.dev);
3970 po->prot_hook.dev = NULL;
3972 spin_unlock(&po->bind_lock);
3976 if (dev->ifindex == po->ifindex) {
3977 spin_lock(&po->bind_lock);
3979 register_prot_hook(sk);
3980 spin_unlock(&po->bind_lock);
3990 static int packet_ioctl(struct socket *sock, unsigned int cmd,
3993 struct sock *sk = sock->sk;
3998 int amount = sk_wmem_alloc_get(sk);
4000 return put_user(amount, (int __user *)arg);
4004 struct sk_buff *skb;
4007 spin_lock_bh(&sk->sk_receive_queue.lock);
4008 skb = skb_peek(&sk->sk_receive_queue);
4011 spin_unlock_bh(&sk->sk_receive_queue.lock);
4012 return put_user(amount, (int __user *)arg);
4015 return sock_get_timestamp(sk, (struct timeval __user *)arg);
4017 return sock_get_timestampns(sk, (struct timespec __user *)arg);
4027 case SIOCGIFBRDADDR:
4028 case SIOCSIFBRDADDR:
4029 case SIOCGIFNETMASK:
4030 case SIOCSIFNETMASK:
4031 case SIOCGIFDSTADDR:
4032 case SIOCSIFDSTADDR:
4034 return inet_dgram_ops.ioctl(sock, cmd, arg);
4038 return -ENOIOCTLCMD;
4043 static unsigned int packet_poll(struct file *file, struct socket *sock,
4046 struct sock *sk = sock->sk;
4047 struct packet_sock *po = pkt_sk(sk);
4048 unsigned int mask = datagram_poll(file, sock, wait);
4050 spin_lock_bh(&sk->sk_receive_queue.lock);
4051 if (po->rx_ring.pg_vec) {
4052 if (!packet_previous_rx_frame(po, &po->rx_ring,
4054 mask |= POLLIN | POLLRDNORM;
4056 if (po->pressure && __packet_rcv_has_room(po, NULL) == ROOM_NORMAL)
4058 spin_unlock_bh(&sk->sk_receive_queue.lock);
4059 spin_lock_bh(&sk->sk_write_queue.lock);
4060 if (po->tx_ring.pg_vec) {
4061 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
4062 mask |= POLLOUT | POLLWRNORM;
4064 spin_unlock_bh(&sk->sk_write_queue.lock);
4069 /* Dirty? Well, I still did not learn better way to account
4073 static void packet_mm_open(struct vm_area_struct *vma)
4075 struct file *file = vma->vm_file;
4076 struct socket *sock = file->private_data;
4077 struct sock *sk = sock->sk;
4080 atomic_inc(&pkt_sk(sk)->mapped);
4083 static void packet_mm_close(struct vm_area_struct *vma)
4085 struct file *file = vma->vm_file;
4086 struct socket *sock = file->private_data;
4087 struct sock *sk = sock->sk;
4090 atomic_dec(&pkt_sk(sk)->mapped);
4093 static const struct vm_operations_struct packet_mmap_ops = {
4094 .open = packet_mm_open,
4095 .close = packet_mm_close,
4098 static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
4103 for (i = 0; i < len; i++) {
4104 if (likely(pg_vec[i].buffer)) {
4105 if (is_vmalloc_addr(pg_vec[i].buffer))
4106 vfree(pg_vec[i].buffer);
4108 free_pages((unsigned long)pg_vec[i].buffer,
4110 pg_vec[i].buffer = NULL;
4116 static char *alloc_one_pg_vec_page(unsigned long order)
4119 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
4120 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
4122 buffer = (char *) __get_free_pages(gfp_flags, order);
4126 /* __get_free_pages failed, fall back to vmalloc */
4127 buffer = vzalloc((1 << order) * PAGE_SIZE);
4131 /* vmalloc failed, lets dig into swap here */
4132 gfp_flags &= ~__GFP_NORETRY;
4133 buffer = (char *) __get_free_pages(gfp_flags, order);
4137 /* complete and utter failure */
4141 static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
4143 unsigned int block_nr = req->tp_block_nr;
4147 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
4148 if (unlikely(!pg_vec))
4151 for (i = 0; i < block_nr; i++) {
4152 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
4153 if (unlikely(!pg_vec[i].buffer))
4154 goto out_free_pgvec;
4161 free_pg_vec(pg_vec, order, block_nr);
4166 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
4167 int closing, int tx_ring)
4169 struct pgv *pg_vec = NULL;
4170 struct packet_sock *po = pkt_sk(sk);
4171 int was_running, order = 0;
4172 struct packet_ring_buffer *rb;
4173 struct sk_buff_head *rb_queue;
4176 /* Added to avoid minimal code churn */
4177 struct tpacket_req *req = &req_u->req;
4180 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
4181 if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) {
4182 net_warn_ratelimited("Tx-ring is not supported.\n");
4186 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
4187 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
4191 if (atomic_read(&po->mapped))
4193 if (packet_read_pending(rb))
4197 if (req->tp_block_nr) {
4198 /* Sanity tests and some calculations */
4200 if (unlikely(rb->pg_vec))
4203 switch (po->tp_version) {
4205 po->tp_hdrlen = TPACKET_HDRLEN;
4208 po->tp_hdrlen = TPACKET2_HDRLEN;
4211 po->tp_hdrlen = TPACKET3_HDRLEN;
4216 if (unlikely((int)req->tp_block_size <= 0))
4218 if (unlikely(!PAGE_ALIGNED(req->tp_block_size)))
4220 if (po->tp_version >= TPACKET_V3 &&
4221 (int)(req->tp_block_size -
4222 BLK_PLUS_PRIV(req_u->req3.tp_sizeof_priv)) <= 0)
4224 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
4227 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
4230 rb->frames_per_block = req->tp_block_size / req->tp_frame_size;
4231 if (unlikely(rb->frames_per_block == 0))
4233 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
4238 order = get_order(req->tp_block_size);
4239 pg_vec = alloc_pg_vec(req, order);
4240 if (unlikely(!pg_vec))
4242 switch (po->tp_version) {
4244 /* Transmit path is not supported. We checked
4245 * it above but just being paranoid
4248 init_prb_bdqc(po, rb, pg_vec, req_u);
4257 if (unlikely(req->tp_frame_nr))
4262 /* Detach socket from network */
4263 spin_lock(&po->bind_lock);
4264 was_running = po->running;
4268 __unregister_prot_hook(sk, false);
4270 spin_unlock(&po->bind_lock);
4275 mutex_lock(&po->pg_vec_lock);
4276 if (closing || atomic_read(&po->mapped) == 0) {
4278 spin_lock_bh(&rb_queue->lock);
4279 swap(rb->pg_vec, pg_vec);
4280 rb->frame_max = (req->tp_frame_nr - 1);
4282 rb->frame_size = req->tp_frame_size;
4283 spin_unlock_bh(&rb_queue->lock);
4285 swap(rb->pg_vec_order, order);
4286 swap(rb->pg_vec_len, req->tp_block_nr);
4288 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
4289 po->prot_hook.func = (po->rx_ring.pg_vec) ?
4290 tpacket_rcv : packet_rcv;
4291 skb_queue_purge(rb_queue);
4292 if (atomic_read(&po->mapped))
4293 pr_err("packet_mmap: vma is busy: %d\n",
4294 atomic_read(&po->mapped));
4296 mutex_unlock(&po->pg_vec_lock);
4298 spin_lock(&po->bind_lock);
4301 register_prot_hook(sk);
4303 spin_unlock(&po->bind_lock);
4304 if (closing && (po->tp_version > TPACKET_V2)) {
4305 /* Because we don't support block-based V3 on tx-ring */
4307 prb_shutdown_retire_blk_timer(po, rb_queue);
4311 free_pg_vec(pg_vec, order, req->tp_block_nr);
4317 static int packet_mmap(struct file *file, struct socket *sock,
4318 struct vm_area_struct *vma)
4320 struct sock *sk = sock->sk;
4321 struct packet_sock *po = pkt_sk(sk);
4322 unsigned long size, expected_size;
4323 struct packet_ring_buffer *rb;
4324 unsigned long start;
4331 mutex_lock(&po->pg_vec_lock);
4334 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4336 expected_size += rb->pg_vec_len
4342 if (expected_size == 0)
4345 size = vma->vm_end - vma->vm_start;
4346 if (size != expected_size)
4349 start = vma->vm_start;
4350 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4351 if (rb->pg_vec == NULL)
4354 for (i = 0; i < rb->pg_vec_len; i++) {
4356 void *kaddr = rb->pg_vec[i].buffer;
4359 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
4360 page = pgv_to_page(kaddr);
4361 err = vm_insert_page(vma, start, page);
4370 atomic_inc(&po->mapped);
4371 vma->vm_ops = &packet_mmap_ops;
4375 mutex_unlock(&po->pg_vec_lock);
4379 static const struct proto_ops packet_ops_spkt = {
4380 .family = PF_PACKET,
4381 .owner = THIS_MODULE,
4382 .release = packet_release,
4383 .bind = packet_bind_spkt,
4384 .connect = sock_no_connect,
4385 .socketpair = sock_no_socketpair,
4386 .accept = sock_no_accept,
4387 .getname = packet_getname_spkt,
4388 .poll = datagram_poll,
4389 .ioctl = packet_ioctl,
4390 .listen = sock_no_listen,
4391 .shutdown = sock_no_shutdown,
4392 .setsockopt = sock_no_setsockopt,
4393 .getsockopt = sock_no_getsockopt,
4394 .sendmsg = packet_sendmsg_spkt,
4395 .recvmsg = packet_recvmsg,
4396 .mmap = sock_no_mmap,
4397 .sendpage = sock_no_sendpage,
4400 static const struct proto_ops packet_ops = {
4401 .family = PF_PACKET,
4402 .owner = THIS_MODULE,
4403 .release = packet_release,
4404 .bind = packet_bind,
4405 .connect = sock_no_connect,
4406 .socketpair = sock_no_socketpair,
4407 .accept = sock_no_accept,
4408 .getname = packet_getname,
4409 .poll = packet_poll,
4410 .ioctl = packet_ioctl,
4411 .listen = sock_no_listen,
4412 .shutdown = sock_no_shutdown,
4413 .setsockopt = packet_setsockopt,
4414 .getsockopt = packet_getsockopt,
4415 #ifdef CONFIG_COMPAT
4416 .compat_setsockopt = compat_packet_setsockopt,
4418 .sendmsg = packet_sendmsg,
4419 .recvmsg = packet_recvmsg,
4420 .mmap = packet_mmap,
4421 .sendpage = sock_no_sendpage,
4424 static const struct net_proto_family packet_family_ops = {
4425 .family = PF_PACKET,
4426 .create = packet_create,
4427 .owner = THIS_MODULE,
4430 static struct notifier_block packet_netdev_notifier = {
4431 .notifier_call = packet_notifier,
4434 #ifdef CONFIG_PROC_FS
4436 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
4439 struct net *net = seq_file_net(seq);
4442 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
4445 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4447 struct net *net = seq_file_net(seq);
4448 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
4451 static void packet_seq_stop(struct seq_file *seq, void *v)
4457 static int packet_seq_show(struct seq_file *seq, void *v)
4459 if (v == SEQ_START_TOKEN)
4460 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4462 struct sock *s = sk_entry(v);
4463 const struct packet_sock *po = pkt_sk(s);
4466 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
4468 atomic_read(&s->sk_refcnt),
4473 atomic_read(&s->sk_rmem_alloc),
4474 from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)),
4481 static const struct seq_operations packet_seq_ops = {
4482 .start = packet_seq_start,
4483 .next = packet_seq_next,
4484 .stop = packet_seq_stop,
4485 .show = packet_seq_show,
4488 static int packet_seq_open(struct inode *inode, struct file *file)
4490 return seq_open_net(inode, file, &packet_seq_ops,
4491 sizeof(struct seq_net_private));
4494 static const struct file_operations packet_seq_fops = {
4495 .owner = THIS_MODULE,
4496 .open = packet_seq_open,
4498 .llseek = seq_lseek,
4499 .release = seq_release_net,
4504 static int __net_init packet_net_init(struct net *net)
4506 mutex_init(&net->packet.sklist_lock);
4507 INIT_HLIST_HEAD(&net->packet.sklist);
4509 if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops))
4515 static void __net_exit packet_net_exit(struct net *net)
4517 remove_proc_entry("packet", net->proc_net);
4520 static struct pernet_operations packet_net_ops = {
4521 .init = packet_net_init,
4522 .exit = packet_net_exit,
4526 static void __exit packet_exit(void)
4528 unregister_netdevice_notifier(&packet_netdev_notifier);
4529 unregister_pernet_subsys(&packet_net_ops);
4530 sock_unregister(PF_PACKET);
4531 proto_unregister(&packet_proto);
4534 static int __init packet_init(void)
4536 int rc = proto_register(&packet_proto, 0);
4541 sock_register(&packet_family_ops);
4542 register_pernet_subsys(&packet_net_ops);
4543 register_netdevice_notifier(&packet_netdev_notifier);
4548 module_init(packet_init);
4549 module_exit(packet_exit);
4550 MODULE_LICENSE("GPL");
4551 MODULE_ALIAS_NETPROTO(PF_PACKET);