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 <linux/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 BLOCK_STATUS(x) ((x)->hdr.bh1.block_status)
181 #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts)
182 #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt)
183 #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len)
184 #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num)
185 #define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
186 #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x)))
189 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
190 struct packet_type *pt, struct net_device *orig_dev);
192 static void *packet_previous_frame(struct packet_sock *po,
193 struct packet_ring_buffer *rb,
195 static void packet_increment_head(struct packet_ring_buffer *buff);
196 static int prb_curr_blk_in_use(struct tpacket_block_desc *);
197 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *,
198 struct packet_sock *);
199 static void prb_retire_current_block(struct tpacket_kbdq_core *,
200 struct packet_sock *, unsigned int status);
201 static int prb_queue_frozen(struct tpacket_kbdq_core *);
202 static void prb_open_block(struct tpacket_kbdq_core *,
203 struct tpacket_block_desc *);
204 static void prb_retire_rx_blk_timer_expired(unsigned long);
205 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *);
206 static void prb_init_blk_timer(struct packet_sock *,
207 struct tpacket_kbdq_core *,
208 void (*func) (unsigned long));
209 static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *);
210 static void prb_clear_rxhash(struct tpacket_kbdq_core *,
211 struct tpacket3_hdr *);
212 static void prb_fill_vlan_info(struct tpacket_kbdq_core *,
213 struct tpacket3_hdr *);
214 static void packet_flush_mclist(struct sock *sk);
215 static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb);
217 struct packet_skb_cb {
219 struct sockaddr_pkt pkt;
221 /* Trick: alias skb original length with
222 * ll.sll_family and ll.protocol in order
225 unsigned int origlen;
226 struct sockaddr_ll ll;
231 #define vio_le() virtio_legacy_is_little_endian()
233 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
235 #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
236 #define GET_PBLOCK_DESC(x, bid) \
237 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
238 #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
239 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
240 #define GET_NEXT_PRB_BLK_NUM(x) \
241 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
242 ((x)->kactive_blk_num+1) : 0)
244 static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
245 static void __fanout_link(struct sock *sk, struct packet_sock *po);
247 static int packet_direct_xmit(struct sk_buff *skb)
249 struct net_device *dev = skb->dev;
250 struct sk_buff *orig_skb = skb;
251 struct netdev_queue *txq;
252 int ret = NETDEV_TX_BUSY;
254 if (unlikely(!netif_running(dev) ||
255 !netif_carrier_ok(dev)))
258 skb = validate_xmit_skb_list(skb, dev);
262 packet_pick_tx_queue(dev, skb);
263 txq = skb_get_tx_queue(dev, skb);
267 HARD_TX_LOCK(dev, txq, smp_processor_id());
268 if (!netif_xmit_frozen_or_drv_stopped(txq))
269 ret = netdev_start_xmit(skb, dev, txq, false);
270 HARD_TX_UNLOCK(dev, txq);
274 if (!dev_xmit_complete(ret))
279 atomic_long_inc(&dev->tx_dropped);
281 return NET_XMIT_DROP;
284 static struct net_device *packet_cached_dev_get(struct packet_sock *po)
286 struct net_device *dev;
289 dev = rcu_dereference(po->cached_dev);
297 static void packet_cached_dev_assign(struct packet_sock *po,
298 struct net_device *dev)
300 rcu_assign_pointer(po->cached_dev, dev);
303 static void packet_cached_dev_reset(struct packet_sock *po)
305 RCU_INIT_POINTER(po->cached_dev, NULL);
308 static bool packet_use_direct_xmit(const struct packet_sock *po)
310 return po->xmit == packet_direct_xmit;
313 static u16 __packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
315 return (u16) raw_smp_processor_id() % dev->real_num_tx_queues;
318 static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
320 const struct net_device_ops *ops = dev->netdev_ops;
323 if (ops->ndo_select_queue) {
324 queue_index = ops->ndo_select_queue(dev, skb, NULL,
325 __packet_pick_tx_queue);
326 queue_index = netdev_cap_txqueue(dev, queue_index);
328 queue_index = __packet_pick_tx_queue(dev, skb);
331 skb_set_queue_mapping(skb, queue_index);
334 /* register_prot_hook must be invoked with the po->bind_lock held,
335 * or from a context in which asynchronous accesses to the packet
336 * socket is not possible (packet_create()).
338 static void register_prot_hook(struct sock *sk)
340 struct packet_sock *po = pkt_sk(sk);
344 __fanout_link(sk, po);
346 dev_add_pack(&po->prot_hook);
353 /* {,__}unregister_prot_hook() must be invoked with the po->bind_lock
354 * held. If the sync parameter is true, we will temporarily drop
355 * the po->bind_lock and do a synchronize_net to make sure no
356 * asynchronous packet processing paths still refer to the elements
357 * of po->prot_hook. If the sync parameter is false, it is the
358 * callers responsibility to take care of this.
360 static void __unregister_prot_hook(struct sock *sk, bool sync)
362 struct packet_sock *po = pkt_sk(sk);
367 __fanout_unlink(sk, po);
369 __dev_remove_pack(&po->prot_hook);
374 spin_unlock(&po->bind_lock);
376 spin_lock(&po->bind_lock);
380 static void unregister_prot_hook(struct sock *sk, bool sync)
382 struct packet_sock *po = pkt_sk(sk);
385 __unregister_prot_hook(sk, sync);
388 static inline struct page * __pure pgv_to_page(void *addr)
390 if (is_vmalloc_addr(addr))
391 return vmalloc_to_page(addr);
392 return virt_to_page(addr);
395 static void __packet_set_status(struct packet_sock *po, void *frame, int status)
397 union tpacket_uhdr h;
400 switch (po->tp_version) {
402 h.h1->tp_status = status;
403 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
406 h.h2->tp_status = status;
407 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
410 h.h3->tp_status = status;
411 flush_dcache_page(pgv_to_page(&h.h3->tp_status));
414 WARN(1, "TPACKET version not supported.\n");
421 static int __packet_get_status(struct packet_sock *po, void *frame)
423 union tpacket_uhdr h;
428 switch (po->tp_version) {
430 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
431 return h.h1->tp_status;
433 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
434 return h.h2->tp_status;
436 flush_dcache_page(pgv_to_page(&h.h3->tp_status));
437 return h.h3->tp_status;
439 WARN(1, "TPACKET version not supported.\n");
445 static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts,
448 struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
451 (flags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
452 ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts))
453 return TP_STATUS_TS_RAW_HARDWARE;
455 if (ktime_to_timespec_cond(skb->tstamp, ts))
456 return TP_STATUS_TS_SOFTWARE;
461 static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame,
464 union tpacket_uhdr h;
468 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
472 switch (po->tp_version) {
474 h.h1->tp_sec = ts.tv_sec;
475 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
478 h.h2->tp_sec = ts.tv_sec;
479 h.h2->tp_nsec = ts.tv_nsec;
482 h.h3->tp_sec = ts.tv_sec;
483 h.h3->tp_nsec = ts.tv_nsec;
486 WARN(1, "TPACKET version not supported.\n");
490 /* one flush is safe, as both fields always lie on the same cacheline */
491 flush_dcache_page(pgv_to_page(&h.h1->tp_sec));
497 static void *packet_lookup_frame(struct packet_sock *po,
498 struct packet_ring_buffer *rb,
499 unsigned int position,
502 unsigned int pg_vec_pos, frame_offset;
503 union tpacket_uhdr h;
505 pg_vec_pos = position / rb->frames_per_block;
506 frame_offset = position % rb->frames_per_block;
508 h.raw = rb->pg_vec[pg_vec_pos].buffer +
509 (frame_offset * rb->frame_size);
511 if (status != __packet_get_status(po, h.raw))
517 static void *packet_current_frame(struct packet_sock *po,
518 struct packet_ring_buffer *rb,
521 return packet_lookup_frame(po, rb, rb->head, status);
524 static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc)
526 del_timer_sync(&pkc->retire_blk_timer);
529 static void prb_shutdown_retire_blk_timer(struct packet_sock *po,
530 struct sk_buff_head *rb_queue)
532 struct tpacket_kbdq_core *pkc;
534 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
536 spin_lock_bh(&rb_queue->lock);
537 pkc->delete_blk_timer = 1;
538 spin_unlock_bh(&rb_queue->lock);
540 prb_del_retire_blk_timer(pkc);
543 static void prb_init_blk_timer(struct packet_sock *po,
544 struct tpacket_kbdq_core *pkc,
545 void (*func) (unsigned long))
547 init_timer(&pkc->retire_blk_timer);
548 pkc->retire_blk_timer.data = (long)po;
549 pkc->retire_blk_timer.function = func;
550 pkc->retire_blk_timer.expires = jiffies;
553 static void prb_setup_retire_blk_timer(struct packet_sock *po)
555 struct tpacket_kbdq_core *pkc;
557 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
558 prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired);
561 static int prb_calc_retire_blk_tmo(struct packet_sock *po,
562 int blk_size_in_bytes)
564 struct net_device *dev;
565 unsigned int mbits = 0, msec = 0, div = 0, tmo = 0;
566 struct ethtool_link_ksettings ecmd;
570 dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex);
571 if (unlikely(!dev)) {
573 return DEFAULT_PRB_RETIRE_TOV;
575 err = __ethtool_get_link_ksettings(dev, &ecmd);
579 * If the link speed is so slow you don't really
580 * need to worry about perf anyways
582 if (ecmd.base.speed < SPEED_1000 ||
583 ecmd.base.speed == SPEED_UNKNOWN) {
584 return DEFAULT_PRB_RETIRE_TOV;
587 div = ecmd.base.speed / 1000;
591 mbits = (blk_size_in_bytes * 8) / (1024 * 1024);
603 static void prb_init_ft_ops(struct tpacket_kbdq_core *p1,
604 union tpacket_req_u *req_u)
606 p1->feature_req_word = req_u->req3.tp_feature_req_word;
609 static void init_prb_bdqc(struct packet_sock *po,
610 struct packet_ring_buffer *rb,
612 union tpacket_req_u *req_u)
614 struct tpacket_kbdq_core *p1 = GET_PBDQC_FROM_RB(rb);
615 struct tpacket_block_desc *pbd;
617 memset(p1, 0x0, sizeof(*p1));
619 p1->knxt_seq_num = 1;
621 pbd = (struct tpacket_block_desc *)pg_vec[0].buffer;
622 p1->pkblk_start = pg_vec[0].buffer;
623 p1->kblk_size = req_u->req3.tp_block_size;
624 p1->knum_blocks = req_u->req3.tp_block_nr;
625 p1->hdrlen = po->tp_hdrlen;
626 p1->version = po->tp_version;
627 p1->last_kactive_blk_num = 0;
628 po->stats.stats3.tp_freeze_q_cnt = 0;
629 if (req_u->req3.tp_retire_blk_tov)
630 p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov;
632 p1->retire_blk_tov = prb_calc_retire_blk_tmo(po,
633 req_u->req3.tp_block_size);
634 p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov);
635 p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv;
637 p1->max_frame_len = p1->kblk_size - BLK_PLUS_PRIV(p1->blk_sizeof_priv);
638 prb_init_ft_ops(p1, req_u);
639 prb_setup_retire_blk_timer(po);
640 prb_open_block(p1, pbd);
643 /* Do NOT update the last_blk_num first.
644 * Assumes sk_buff_head lock is held.
646 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc)
648 mod_timer(&pkc->retire_blk_timer,
649 jiffies + pkc->tov_in_jiffies);
650 pkc->last_kactive_blk_num = pkc->kactive_blk_num;
655 * 1) We refresh the timer only when we open a block.
656 * By doing this we don't waste cycles refreshing the timer
657 * on packet-by-packet basis.
659 * With a 1MB block-size, on a 1Gbps line, it will take
660 * i) ~8 ms to fill a block + ii) memcpy etc.
661 * In this cut we are not accounting for the memcpy time.
663 * So, if the user sets the 'tmo' to 10ms then the timer
664 * will never fire while the block is still getting filled
665 * (which is what we want). However, the user could choose
666 * to close a block early and that's fine.
668 * But when the timer does fire, we check whether or not to refresh it.
669 * Since the tmo granularity is in msecs, it is not too expensive
670 * to refresh the timer, lets say every '8' msecs.
671 * Either the user can set the 'tmo' or we can derive it based on
672 * a) line-speed and b) block-size.
673 * prb_calc_retire_blk_tmo() calculates the tmo.
676 static void prb_retire_rx_blk_timer_expired(unsigned long data)
678 struct packet_sock *po = (struct packet_sock *)data;
679 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
681 struct tpacket_block_desc *pbd;
683 spin_lock(&po->sk.sk_receive_queue.lock);
685 frozen = prb_queue_frozen(pkc);
686 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
688 if (unlikely(pkc->delete_blk_timer))
691 /* We only need to plug the race when the block is partially filled.
693 * lock(); increment BLOCK_NUM_PKTS; unlock()
694 * copy_bits() is in progress ...
695 * timer fires on other cpu:
696 * we can't retire the current block because copy_bits
700 if (BLOCK_NUM_PKTS(pbd)) {
701 while (atomic_read(&pkc->blk_fill_in_prog)) {
702 /* Waiting for skb_copy_bits to finish... */
707 if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) {
709 if (!BLOCK_NUM_PKTS(pbd)) {
710 /* An empty block. Just refresh the timer. */
713 prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO);
714 if (!prb_dispatch_next_block(pkc, po))
719 /* Case 1. Queue was frozen because user-space was
722 if (prb_curr_blk_in_use(pbd)) {
724 * Ok, user-space is still behind.
725 * So just refresh the timer.
729 /* Case 2. queue was frozen,user-space caught up,
730 * now the link went idle && the timer fired.
731 * We don't have a block to close.So we open this
732 * block and restart the timer.
733 * opening a block thaws the queue,restarts timer
734 * Thawing/timer-refresh is a side effect.
736 prb_open_block(pkc, pbd);
743 _prb_refresh_rx_retire_blk_timer(pkc);
746 spin_unlock(&po->sk.sk_receive_queue.lock);
749 static void prb_flush_block(struct tpacket_kbdq_core *pkc1,
750 struct tpacket_block_desc *pbd1, __u32 status)
752 /* Flush everything minus the block header */
754 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
759 /* Skip the block header(we know header WILL fit in 4K) */
762 end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end);
763 for (; start < end; start += PAGE_SIZE)
764 flush_dcache_page(pgv_to_page(start));
769 /* Now update the block status. */
771 BLOCK_STATUS(pbd1) = status;
773 /* Flush the block header */
775 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
777 flush_dcache_page(pgv_to_page(start));
787 * 2) Increment active_blk_num
789 * Note:We DONT refresh the timer on purpose.
790 * Because almost always the next block will be opened.
792 static void prb_close_block(struct tpacket_kbdq_core *pkc1,
793 struct tpacket_block_desc *pbd1,
794 struct packet_sock *po, unsigned int stat)
796 __u32 status = TP_STATUS_USER | stat;
798 struct tpacket3_hdr *last_pkt;
799 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
800 struct sock *sk = &po->sk;
802 if (po->stats.stats3.tp_drops)
803 status |= TP_STATUS_LOSING;
805 last_pkt = (struct tpacket3_hdr *)pkc1->prev;
806 last_pkt->tp_next_offset = 0;
808 /* Get the ts of the last pkt */
809 if (BLOCK_NUM_PKTS(pbd1)) {
810 h1->ts_last_pkt.ts_sec = last_pkt->tp_sec;
811 h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec;
813 /* Ok, we tmo'd - so get the current time.
815 * It shouldn't really happen as we don't close empty
816 * blocks. See prb_retire_rx_blk_timer_expired().
820 h1->ts_last_pkt.ts_sec = ts.tv_sec;
821 h1->ts_last_pkt.ts_nsec = ts.tv_nsec;
826 /* Flush the block */
827 prb_flush_block(pkc1, pbd1, status);
829 sk->sk_data_ready(sk);
831 pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1);
834 static void prb_thaw_queue(struct tpacket_kbdq_core *pkc)
836 pkc->reset_pending_on_curr_blk = 0;
840 * Side effect of opening a block:
842 * 1) prb_queue is thawed.
843 * 2) retire_blk_timer is refreshed.
846 static void prb_open_block(struct tpacket_kbdq_core *pkc1,
847 struct tpacket_block_desc *pbd1)
850 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
854 /* We could have just memset this but we will lose the
855 * flexibility of making the priv area sticky
858 BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++;
859 BLOCK_NUM_PKTS(pbd1) = 0;
860 BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
864 h1->ts_first_pkt.ts_sec = ts.tv_sec;
865 h1->ts_first_pkt.ts_nsec = ts.tv_nsec;
867 pkc1->pkblk_start = (char *)pbd1;
868 pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
870 BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
871 BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN;
873 pbd1->version = pkc1->version;
874 pkc1->prev = pkc1->nxt_offset;
875 pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size;
877 prb_thaw_queue(pkc1);
878 _prb_refresh_rx_retire_blk_timer(pkc1);
884 * Queue freeze logic:
885 * 1) Assume tp_block_nr = 8 blocks.
886 * 2) At time 't0', user opens Rx ring.
887 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
888 * 4) user-space is either sleeping or processing block '0'.
889 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
890 * it will close block-7,loop around and try to fill block '0'.
892 * __packet_lookup_frame_in_block
893 * prb_retire_current_block()
894 * prb_dispatch_next_block()
895 * |->(BLOCK_STATUS == USER) evaluates to true
896 * 5.1) Since block-0 is currently in-use, we just freeze the queue.
897 * 6) Now there are two cases:
898 * 6.1) Link goes idle right after the queue is frozen.
899 * But remember, the last open_block() refreshed the timer.
900 * When this timer expires,it will refresh itself so that we can
901 * re-open block-0 in near future.
902 * 6.2) Link is busy and keeps on receiving packets. This is a simple
903 * case and __packet_lookup_frame_in_block will check if block-0
904 * is free and can now be re-used.
906 static void prb_freeze_queue(struct tpacket_kbdq_core *pkc,
907 struct packet_sock *po)
909 pkc->reset_pending_on_curr_blk = 1;
910 po->stats.stats3.tp_freeze_q_cnt++;
913 #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
916 * If the next block is free then we will dispatch it
917 * and return a good offset.
918 * Else, we will freeze the queue.
919 * So, caller must check the return value.
921 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc,
922 struct packet_sock *po)
924 struct tpacket_block_desc *pbd;
928 /* 1. Get current block num */
929 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
931 /* 2. If this block is currently in_use then freeze the queue */
932 if (TP_STATUS_USER & BLOCK_STATUS(pbd)) {
933 prb_freeze_queue(pkc, po);
939 * open this block and return the offset where the first packet
940 * needs to get stored.
942 prb_open_block(pkc, pbd);
943 return (void *)pkc->nxt_offset;
946 static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
947 struct packet_sock *po, unsigned int status)
949 struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
951 /* retire/close the current block */
952 if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) {
954 * Plug the case where copy_bits() is in progress on
955 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
956 * have space to copy the pkt in the current block and
957 * called prb_retire_current_block()
959 * We don't need to worry about the TMO case because
960 * the timer-handler already handled this case.
962 if (!(status & TP_STATUS_BLK_TMO)) {
963 while (atomic_read(&pkc->blk_fill_in_prog)) {
964 /* Waiting for skb_copy_bits to finish... */
968 prb_close_block(pkc, pbd, po, status);
973 static int prb_curr_blk_in_use(struct tpacket_block_desc *pbd)
975 return TP_STATUS_USER & BLOCK_STATUS(pbd);
978 static int prb_queue_frozen(struct tpacket_kbdq_core *pkc)
980 return pkc->reset_pending_on_curr_blk;
983 static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb)
985 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
986 atomic_dec(&pkc->blk_fill_in_prog);
989 static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc,
990 struct tpacket3_hdr *ppd)
992 ppd->hv1.tp_rxhash = skb_get_hash(pkc->skb);
995 static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc,
996 struct tpacket3_hdr *ppd)
998 ppd->hv1.tp_rxhash = 0;
1001 static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
1002 struct tpacket3_hdr *ppd)
1004 if (skb_vlan_tag_present(pkc->skb)) {
1005 ppd->hv1.tp_vlan_tci = skb_vlan_tag_get(pkc->skb);
1006 ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->vlan_proto);
1007 ppd->tp_status = TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
1009 ppd->hv1.tp_vlan_tci = 0;
1010 ppd->hv1.tp_vlan_tpid = 0;
1011 ppd->tp_status = TP_STATUS_AVAILABLE;
1015 static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc,
1016 struct tpacket3_hdr *ppd)
1018 ppd->hv1.tp_padding = 0;
1019 prb_fill_vlan_info(pkc, ppd);
1021 if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH)
1022 prb_fill_rxhash(pkc, ppd);
1024 prb_clear_rxhash(pkc, ppd);
1027 static void prb_fill_curr_block(char *curr,
1028 struct tpacket_kbdq_core *pkc,
1029 struct tpacket_block_desc *pbd,
1032 struct tpacket3_hdr *ppd;
1034 ppd = (struct tpacket3_hdr *)curr;
1035 ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len);
1037 pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len);
1038 BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len);
1039 BLOCK_NUM_PKTS(pbd) += 1;
1040 atomic_inc(&pkc->blk_fill_in_prog);
1041 prb_run_all_ft_ops(pkc, ppd);
1044 /* Assumes caller has the sk->rx_queue.lock */
1045 static void *__packet_lookup_frame_in_block(struct packet_sock *po,
1046 struct sk_buff *skb,
1051 struct tpacket_kbdq_core *pkc;
1052 struct tpacket_block_desc *pbd;
1055 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
1056 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1058 /* Queue is frozen when user space is lagging behind */
1059 if (prb_queue_frozen(pkc)) {
1061 * Check if that last block which caused the queue to freeze,
1062 * is still in_use by user-space.
1064 if (prb_curr_blk_in_use(pbd)) {
1065 /* Can't record this packet */
1069 * Ok, the block was released by user-space.
1070 * Now let's open that block.
1071 * opening a block also thaws the queue.
1072 * Thawing is a side effect.
1074 prb_open_block(pkc, pbd);
1079 curr = pkc->nxt_offset;
1081 end = (char *)pbd + pkc->kblk_size;
1083 /* first try the current block */
1084 if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) {
1085 prb_fill_curr_block(curr, pkc, pbd, len);
1086 return (void *)curr;
1089 /* Ok, close the current block */
1090 prb_retire_current_block(pkc, po, 0);
1092 /* Now, try to dispatch the next block */
1093 curr = (char *)prb_dispatch_next_block(pkc, po);
1095 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1096 prb_fill_curr_block(curr, pkc, pbd, len);
1097 return (void *)curr;
1101 * No free blocks are available.user_space hasn't caught up yet.
1102 * Queue was just frozen and now this packet will get dropped.
1107 static void *packet_current_rx_frame(struct packet_sock *po,
1108 struct sk_buff *skb,
1109 int status, unsigned int len)
1112 switch (po->tp_version) {
1115 curr = packet_lookup_frame(po, &po->rx_ring,
1116 po->rx_ring.head, status);
1119 return __packet_lookup_frame_in_block(po, skb, status, len);
1121 WARN(1, "TPACKET version not supported\n");
1127 static void *prb_lookup_block(struct packet_sock *po,
1128 struct packet_ring_buffer *rb,
1132 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
1133 struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx);
1135 if (status != BLOCK_STATUS(pbd))
1140 static int prb_previous_blk_num(struct packet_ring_buffer *rb)
1143 if (rb->prb_bdqc.kactive_blk_num)
1144 prev = rb->prb_bdqc.kactive_blk_num-1;
1146 prev = rb->prb_bdqc.knum_blocks-1;
1150 /* Assumes caller has held the rx_queue.lock */
1151 static void *__prb_previous_block(struct packet_sock *po,
1152 struct packet_ring_buffer *rb,
1155 unsigned int previous = prb_previous_blk_num(rb);
1156 return prb_lookup_block(po, rb, previous, status);
1159 static void *packet_previous_rx_frame(struct packet_sock *po,
1160 struct packet_ring_buffer *rb,
1163 if (po->tp_version <= TPACKET_V2)
1164 return packet_previous_frame(po, rb, status);
1166 return __prb_previous_block(po, rb, status);
1169 static void packet_increment_rx_head(struct packet_sock *po,
1170 struct packet_ring_buffer *rb)
1172 switch (po->tp_version) {
1175 return packet_increment_head(rb);
1178 WARN(1, "TPACKET version not supported.\n");
1184 static void *packet_previous_frame(struct packet_sock *po,
1185 struct packet_ring_buffer *rb,
1188 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
1189 return packet_lookup_frame(po, rb, previous, status);
1192 static void packet_increment_head(struct packet_ring_buffer *buff)
1194 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
1197 static void packet_inc_pending(struct packet_ring_buffer *rb)
1199 this_cpu_inc(*rb->pending_refcnt);
1202 static void packet_dec_pending(struct packet_ring_buffer *rb)
1204 this_cpu_dec(*rb->pending_refcnt);
1207 static unsigned int packet_read_pending(const struct packet_ring_buffer *rb)
1209 unsigned int refcnt = 0;
1212 /* We don't use pending refcount in rx_ring. */
1213 if (rb->pending_refcnt == NULL)
1216 for_each_possible_cpu(cpu)
1217 refcnt += *per_cpu_ptr(rb->pending_refcnt, cpu);
1222 static int packet_alloc_pending(struct packet_sock *po)
1224 po->rx_ring.pending_refcnt = NULL;
1226 po->tx_ring.pending_refcnt = alloc_percpu(unsigned int);
1227 if (unlikely(po->tx_ring.pending_refcnt == NULL))
1233 static void packet_free_pending(struct packet_sock *po)
1235 free_percpu(po->tx_ring.pending_refcnt);
1238 #define ROOM_POW_OFF 2
1239 #define ROOM_NONE 0x0
1240 #define ROOM_LOW 0x1
1241 #define ROOM_NORMAL 0x2
1243 static bool __tpacket_has_room(struct packet_sock *po, int pow_off)
1247 len = po->rx_ring.frame_max + 1;
1248 idx = po->rx_ring.head;
1250 idx += len >> pow_off;
1253 return packet_lookup_frame(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1256 static bool __tpacket_v3_has_room(struct packet_sock *po, int pow_off)
1260 len = po->rx_ring.prb_bdqc.knum_blocks;
1261 idx = po->rx_ring.prb_bdqc.kactive_blk_num;
1263 idx += len >> pow_off;
1266 return prb_lookup_block(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1269 static int __packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
1271 struct sock *sk = &po->sk;
1272 int ret = ROOM_NONE;
1274 if (po->prot_hook.func != tpacket_rcv) {
1275 int avail = sk->sk_rcvbuf - atomic_read(&sk->sk_rmem_alloc)
1276 - (skb ? skb->truesize : 0);
1277 if (avail > (sk->sk_rcvbuf >> ROOM_POW_OFF))
1285 if (po->tp_version == TPACKET_V3) {
1286 if (__tpacket_v3_has_room(po, ROOM_POW_OFF))
1288 else if (__tpacket_v3_has_room(po, 0))
1291 if (__tpacket_has_room(po, ROOM_POW_OFF))
1293 else if (__tpacket_has_room(po, 0))
1300 static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
1305 spin_lock_bh(&po->sk.sk_receive_queue.lock);
1306 ret = __packet_rcv_has_room(po, skb);
1307 has_room = ret == ROOM_NORMAL;
1308 if (po->pressure == has_room)
1309 po->pressure = !has_room;
1310 spin_unlock_bh(&po->sk.sk_receive_queue.lock);
1315 static void packet_sock_destruct(struct sock *sk)
1317 skb_queue_purge(&sk->sk_error_queue);
1319 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
1320 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
1322 if (!sock_flag(sk, SOCK_DEAD)) {
1323 pr_err("Attempt to release alive packet socket: %p\n", sk);
1327 sk_refcnt_debug_dec(sk);
1330 static bool fanout_flow_is_huge(struct packet_sock *po, struct sk_buff *skb)
1335 rxhash = skb_get_hash(skb);
1336 for (i = 0; i < ROLLOVER_HLEN; i++)
1337 if (po->rollover->history[i] == rxhash)
1340 po->rollover->history[prandom_u32() % ROLLOVER_HLEN] = rxhash;
1341 return count > (ROLLOVER_HLEN >> 1);
1344 static unsigned int fanout_demux_hash(struct packet_fanout *f,
1345 struct sk_buff *skb,
1348 return reciprocal_scale(__skb_get_hash_symmetric(skb), num);
1351 static unsigned int fanout_demux_lb(struct packet_fanout *f,
1352 struct sk_buff *skb,
1355 unsigned int val = atomic_inc_return(&f->rr_cur);
1360 static unsigned int fanout_demux_cpu(struct packet_fanout *f,
1361 struct sk_buff *skb,
1364 return smp_processor_id() % num;
1367 static unsigned int fanout_demux_rnd(struct packet_fanout *f,
1368 struct sk_buff *skb,
1371 return prandom_u32_max(num);
1374 static unsigned int fanout_demux_rollover(struct packet_fanout *f,
1375 struct sk_buff *skb,
1376 unsigned int idx, bool try_self,
1379 struct packet_sock *po, *po_next, *po_skip = NULL;
1380 unsigned int i, j, room = ROOM_NONE;
1382 po = pkt_sk(f->arr[idx]);
1385 room = packet_rcv_has_room(po, skb);
1386 if (room == ROOM_NORMAL ||
1387 (room == ROOM_LOW && !fanout_flow_is_huge(po, skb)))
1392 i = j = min_t(int, po->rollover->sock, num - 1);
1394 po_next = pkt_sk(f->arr[i]);
1395 if (po_next != po_skip && !po_next->pressure &&
1396 packet_rcv_has_room(po_next, skb) == ROOM_NORMAL) {
1398 po->rollover->sock = i;
1399 atomic_long_inc(&po->rollover->num);
1400 if (room == ROOM_LOW)
1401 atomic_long_inc(&po->rollover->num_huge);
1409 atomic_long_inc(&po->rollover->num_failed);
1413 static unsigned int fanout_demux_qm(struct packet_fanout *f,
1414 struct sk_buff *skb,
1417 return skb_get_queue_mapping(skb) % num;
1420 static unsigned int fanout_demux_bpf(struct packet_fanout *f,
1421 struct sk_buff *skb,
1424 struct bpf_prog *prog;
1425 unsigned int ret = 0;
1428 prog = rcu_dereference(f->bpf_prog);
1430 ret = bpf_prog_run_clear_cb(prog, skb) % num;
1436 static bool fanout_has_flag(struct packet_fanout *f, u16 flag)
1438 return f->flags & (flag >> 8);
1441 static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
1442 struct packet_type *pt, struct net_device *orig_dev)
1444 struct packet_fanout *f = pt->af_packet_priv;
1445 unsigned int num = READ_ONCE(f->num_members);
1446 struct net *net = read_pnet(&f->net);
1447 struct packet_sock *po;
1450 if (!net_eq(dev_net(dev), net) || !num) {
1455 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) {
1456 skb = ip_check_defrag(net, skb, IP_DEFRAG_AF_PACKET);
1461 case PACKET_FANOUT_HASH:
1463 idx = fanout_demux_hash(f, skb, num);
1465 case PACKET_FANOUT_LB:
1466 idx = fanout_demux_lb(f, skb, num);
1468 case PACKET_FANOUT_CPU:
1469 idx = fanout_demux_cpu(f, skb, num);
1471 case PACKET_FANOUT_RND:
1472 idx = fanout_demux_rnd(f, skb, num);
1474 case PACKET_FANOUT_QM:
1475 idx = fanout_demux_qm(f, skb, num);
1477 case PACKET_FANOUT_ROLLOVER:
1478 idx = fanout_demux_rollover(f, skb, 0, false, num);
1480 case PACKET_FANOUT_CBPF:
1481 case PACKET_FANOUT_EBPF:
1482 idx = fanout_demux_bpf(f, skb, num);
1486 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER))
1487 idx = fanout_demux_rollover(f, skb, idx, true, num);
1489 po = pkt_sk(f->arr[idx]);
1490 return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
1493 DEFINE_MUTEX(fanout_mutex);
1494 EXPORT_SYMBOL_GPL(fanout_mutex);
1495 static LIST_HEAD(fanout_list);
1496 static u16 fanout_next_id;
1498 static void __fanout_link(struct sock *sk, struct packet_sock *po)
1500 struct packet_fanout *f = po->fanout;
1502 spin_lock(&f->lock);
1503 f->arr[f->num_members] = sk;
1506 if (f->num_members == 1)
1507 dev_add_pack(&f->prot_hook);
1508 spin_unlock(&f->lock);
1511 static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
1513 struct packet_fanout *f = po->fanout;
1516 spin_lock(&f->lock);
1517 for (i = 0; i < f->num_members; i++) {
1518 if (f->arr[i] == sk)
1521 BUG_ON(i >= f->num_members);
1522 f->arr[i] = f->arr[f->num_members - 1];
1524 if (f->num_members == 0)
1525 __dev_remove_pack(&f->prot_hook);
1526 spin_unlock(&f->lock);
1529 static bool match_fanout_group(struct packet_type *ptype, struct sock *sk)
1531 if (sk->sk_family != PF_PACKET)
1534 return ptype->af_packet_priv == pkt_sk(sk)->fanout;
1537 static void fanout_init_data(struct packet_fanout *f)
1540 case PACKET_FANOUT_LB:
1541 atomic_set(&f->rr_cur, 0);
1543 case PACKET_FANOUT_CBPF:
1544 case PACKET_FANOUT_EBPF:
1545 RCU_INIT_POINTER(f->bpf_prog, NULL);
1550 static void __fanout_set_data_bpf(struct packet_fanout *f, struct bpf_prog *new)
1552 struct bpf_prog *old;
1554 spin_lock(&f->lock);
1555 old = rcu_dereference_protected(f->bpf_prog, lockdep_is_held(&f->lock));
1556 rcu_assign_pointer(f->bpf_prog, new);
1557 spin_unlock(&f->lock);
1561 bpf_prog_destroy(old);
1565 static int fanout_set_data_cbpf(struct packet_sock *po, char __user *data,
1568 struct bpf_prog *new;
1569 struct sock_fprog fprog;
1572 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1574 if (len != sizeof(fprog))
1576 if (copy_from_user(&fprog, data, len))
1579 ret = bpf_prog_create_from_user(&new, &fprog, NULL, false);
1583 __fanout_set_data_bpf(po->fanout, new);
1587 static int fanout_set_data_ebpf(struct packet_sock *po, char __user *data,
1590 struct bpf_prog *new;
1593 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1595 if (len != sizeof(fd))
1597 if (copy_from_user(&fd, data, len))
1600 new = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER);
1602 return PTR_ERR(new);
1604 __fanout_set_data_bpf(po->fanout, new);
1608 static int fanout_set_data(struct packet_sock *po, char __user *data,
1611 switch (po->fanout->type) {
1612 case PACKET_FANOUT_CBPF:
1613 return fanout_set_data_cbpf(po, data, len);
1614 case PACKET_FANOUT_EBPF:
1615 return fanout_set_data_ebpf(po, data, len);
1621 static void fanout_release_data(struct packet_fanout *f)
1624 case PACKET_FANOUT_CBPF:
1625 case PACKET_FANOUT_EBPF:
1626 __fanout_set_data_bpf(f, NULL);
1630 static bool __fanout_id_is_free(struct sock *sk, u16 candidate_id)
1632 struct packet_fanout *f;
1634 list_for_each_entry(f, &fanout_list, list) {
1635 if (f->id == candidate_id &&
1636 read_pnet(&f->net) == sock_net(sk)) {
1643 static bool fanout_find_new_id(struct sock *sk, u16 *new_id)
1645 u16 id = fanout_next_id;
1648 if (__fanout_id_is_free(sk, id)) {
1650 fanout_next_id = id + 1;
1655 } while (id != fanout_next_id);
1660 static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
1662 struct packet_rollover *rollover = NULL;
1663 struct packet_sock *po = pkt_sk(sk);
1664 struct packet_fanout *f, *match;
1665 u8 type = type_flags & 0xff;
1666 u8 flags = type_flags >> 8;
1670 case PACKET_FANOUT_ROLLOVER:
1671 if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)
1673 case PACKET_FANOUT_HASH:
1674 case PACKET_FANOUT_LB:
1675 case PACKET_FANOUT_CPU:
1676 case PACKET_FANOUT_RND:
1677 case PACKET_FANOUT_QM:
1678 case PACKET_FANOUT_CBPF:
1679 case PACKET_FANOUT_EBPF:
1685 mutex_lock(&fanout_mutex);
1691 if (type == PACKET_FANOUT_ROLLOVER ||
1692 (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) {
1694 rollover = kzalloc(sizeof(*rollover), GFP_KERNEL);
1697 atomic_long_set(&rollover->num, 0);
1698 atomic_long_set(&rollover->num_huge, 0);
1699 atomic_long_set(&rollover->num_failed, 0);
1700 po->rollover = rollover;
1703 if (type_flags & PACKET_FANOUT_FLAG_UNIQUEID) {
1708 if (!fanout_find_new_id(sk, &id)) {
1712 /* ephemeral flag for the first socket in the group: drop it */
1713 flags &= ~(PACKET_FANOUT_FLAG_UNIQUEID >> 8);
1717 list_for_each_entry(f, &fanout_list, list) {
1719 read_pnet(&f->net) == sock_net(sk)) {
1725 if (match && match->flags != flags)
1729 match = kzalloc(sizeof(*match), GFP_KERNEL);
1732 write_pnet(&match->net, sock_net(sk));
1735 match->flags = flags;
1736 INIT_LIST_HEAD(&match->list);
1737 spin_lock_init(&match->lock);
1738 refcount_set(&match->sk_ref, 0);
1739 fanout_init_data(match);
1740 match->prot_hook.type = po->prot_hook.type;
1741 match->prot_hook.dev = po->prot_hook.dev;
1742 match->prot_hook.func = packet_rcv_fanout;
1743 match->prot_hook.af_packet_priv = match;
1744 match->prot_hook.id_match = match_fanout_group;
1745 list_add(&match->list, &fanout_list);
1749 spin_lock(&po->bind_lock);
1751 match->type == type &&
1752 match->prot_hook.type == po->prot_hook.type &&
1753 match->prot_hook.dev == po->prot_hook.dev) {
1755 if (refcount_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
1756 __dev_remove_pack(&po->prot_hook);
1758 refcount_set(&match->sk_ref, refcount_read(&match->sk_ref) + 1);
1759 __fanout_link(sk, po);
1763 spin_unlock(&po->bind_lock);
1765 if (err && !refcount_read(&match->sk_ref)) {
1766 list_del(&match->list);
1771 if (err && rollover) {
1773 po->rollover = NULL;
1775 mutex_unlock(&fanout_mutex);
1779 /* If pkt_sk(sk)->fanout->sk_ref is zero, this function removes
1780 * pkt_sk(sk)->fanout from fanout_list and returns pkt_sk(sk)->fanout.
1781 * It is the responsibility of the caller to call fanout_release_data() and
1782 * free the returned packet_fanout (after synchronize_net())
1784 static struct packet_fanout *fanout_release(struct sock *sk)
1786 struct packet_sock *po = pkt_sk(sk);
1787 struct packet_fanout *f;
1789 mutex_lock(&fanout_mutex);
1794 if (refcount_dec_and_test(&f->sk_ref))
1800 kfree_rcu(po->rollover, rcu);
1802 mutex_unlock(&fanout_mutex);
1807 static bool packet_extra_vlan_len_allowed(const struct net_device *dev,
1808 struct sk_buff *skb)
1810 /* Earlier code assumed this would be a VLAN pkt, double-check
1811 * this now that we have the actual packet in hand. We can only
1812 * do this check on Ethernet devices.
1814 if (unlikely(dev->type != ARPHRD_ETHER))
1817 skb_reset_mac_header(skb);
1818 return likely(eth_hdr(skb)->h_proto == htons(ETH_P_8021Q));
1821 static const struct proto_ops packet_ops;
1823 static const struct proto_ops packet_ops_spkt;
1825 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
1826 struct packet_type *pt, struct net_device *orig_dev)
1829 struct sockaddr_pkt *spkt;
1832 * When we registered the protocol we saved the socket in the data
1833 * field for just this event.
1836 sk = pt->af_packet_priv;
1839 * Yank back the headers [hope the device set this
1840 * right or kerboom...]
1842 * Incoming packets have ll header pulled,
1845 * For outgoing ones skb->data == skb_mac_header(skb)
1846 * so that this procedure is noop.
1849 if (skb->pkt_type == PACKET_LOOPBACK)
1852 if (!net_eq(dev_net(dev), sock_net(sk)))
1855 skb = skb_share_check(skb, GFP_ATOMIC);
1859 /* drop any routing info */
1862 /* drop conntrack reference */
1865 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
1867 skb_push(skb, skb->data - skb_mac_header(skb));
1870 * The SOCK_PACKET socket receives _all_ frames.
1873 spkt->spkt_family = dev->type;
1874 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
1875 spkt->spkt_protocol = skb->protocol;
1878 * Charge the memory to the socket. This is done specifically
1879 * to prevent sockets using all the memory up.
1882 if (sock_queue_rcv_skb(sk, skb) == 0)
1893 * Output a raw packet to a device layer. This bypasses all the other
1894 * protocol layers and you must therefore supply it with a complete frame
1897 static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg,
1900 struct sock *sk = sock->sk;
1901 DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name);
1902 struct sk_buff *skb = NULL;
1903 struct net_device *dev;
1904 struct sockcm_cookie sockc;
1910 * Get and verify the address.
1914 if (msg->msg_namelen < sizeof(struct sockaddr))
1916 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
1917 proto = saddr->spkt_protocol;
1919 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
1922 * Find the device first to size check it
1925 saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0;
1928 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
1934 if (!(dev->flags & IFF_UP))
1938 * You may not queue a frame bigger than the mtu. This is the lowest level
1939 * raw protocol and you must do your own fragmentation at this level.
1942 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
1943 if (!netif_supports_nofcs(dev)) {
1944 err = -EPROTONOSUPPORT;
1947 extra_len = 4; /* We're doing our own CRC */
1951 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len)
1955 size_t reserved = LL_RESERVED_SPACE(dev);
1956 int tlen = dev->needed_tailroom;
1957 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
1960 skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL);
1963 /* FIXME: Save some space for broken drivers that write a hard
1964 * header at transmission time by themselves. PPP is the notable
1965 * one here. This should really be fixed at the driver level.
1967 skb_reserve(skb, reserved);
1968 skb_reset_network_header(skb);
1970 /* Try to align data part correctly */
1975 skb_reset_network_header(skb);
1977 err = memcpy_from_msg(skb_put(skb, len), msg, len);
1983 if (!dev_validate_header(dev, skb->data, len)) {
1987 if (len > (dev->mtu + dev->hard_header_len + extra_len) &&
1988 !packet_extra_vlan_len_allowed(dev, skb)) {
1993 sockc.tsflags = sk->sk_tsflags;
1994 if (msg->msg_controllen) {
1995 err = sock_cmsg_send(sk, msg, &sockc);
2000 skb->protocol = proto;
2002 skb->priority = sk->sk_priority;
2003 skb->mark = sk->sk_mark;
2005 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
2007 if (unlikely(extra_len == 4))
2010 skb_probe_transport_header(skb, 0);
2012 dev_queue_xmit(skb);
2023 static unsigned int run_filter(struct sk_buff *skb,
2024 const struct sock *sk,
2027 struct sk_filter *filter;
2030 filter = rcu_dereference(sk->sk_filter);
2032 res = bpf_prog_run_clear_cb(filter->prog, skb);
2038 static int packet_rcv_vnet(struct msghdr *msg, const struct sk_buff *skb,
2041 struct virtio_net_hdr vnet_hdr;
2043 if (*len < sizeof(vnet_hdr))
2045 *len -= sizeof(vnet_hdr);
2047 if (virtio_net_hdr_from_skb(skb, &vnet_hdr, vio_le(), true))
2050 return memcpy_to_msg(msg, (void *)&vnet_hdr, sizeof(vnet_hdr));
2054 * This function makes lazy skb cloning in hope that most of packets
2055 * are discarded by BPF.
2057 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
2058 * and skb->cb are mangled. It works because (and until) packets
2059 * falling here are owned by current CPU. Output packets are cloned
2060 * by dev_queue_xmit_nit(), input packets are processed by net_bh
2061 * sequencially, so that if we return skb to original state on exit,
2062 * we will not harm anyone.
2065 static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
2066 struct packet_type *pt, struct net_device *orig_dev)
2069 struct sockaddr_ll *sll;
2070 struct packet_sock *po;
2071 u8 *skb_head = skb->data;
2072 int skb_len = skb->len;
2073 unsigned int snaplen, res;
2074 bool is_drop_n_account = false;
2076 if (skb->pkt_type == PACKET_LOOPBACK)
2079 sk = pt->af_packet_priv;
2082 if (!net_eq(dev_net(dev), sock_net(sk)))
2087 if (dev->header_ops) {
2088 /* The device has an explicit notion of ll header,
2089 * exported to higher levels.
2091 * Otherwise, the device hides details of its frame
2092 * structure, so that corresponding packet head is
2093 * never delivered to user.
2095 if (sk->sk_type != SOCK_DGRAM)
2096 skb_push(skb, skb->data - skb_mac_header(skb));
2097 else if (skb->pkt_type == PACKET_OUTGOING) {
2098 /* Special case: outgoing packets have ll header at head */
2099 skb_pull(skb, skb_network_offset(skb));
2105 res = run_filter(skb, sk, snaplen);
2107 goto drop_n_restore;
2111 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
2114 if (skb_shared(skb)) {
2115 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
2119 if (skb_head != skb->data) {
2120 skb->data = skb_head;
2127 sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8);
2129 sll = &PACKET_SKB_CB(skb)->sa.ll;
2130 sll->sll_hatype = dev->type;
2131 sll->sll_pkttype = skb->pkt_type;
2132 if (unlikely(po->origdev))
2133 sll->sll_ifindex = orig_dev->ifindex;
2135 sll->sll_ifindex = dev->ifindex;
2137 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2139 /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg().
2140 * Use their space for storing the original skb length.
2142 PACKET_SKB_CB(skb)->sa.origlen = skb->len;
2144 if (pskb_trim(skb, snaplen))
2147 skb_set_owner_r(skb, sk);
2151 /* drop conntrack reference */
2154 spin_lock(&sk->sk_receive_queue.lock);
2155 po->stats.stats1.tp_packets++;
2156 sock_skb_set_dropcount(sk, skb);
2157 __skb_queue_tail(&sk->sk_receive_queue, skb);
2158 spin_unlock(&sk->sk_receive_queue.lock);
2159 sk->sk_data_ready(sk);
2163 is_drop_n_account = true;
2164 spin_lock(&sk->sk_receive_queue.lock);
2165 po->stats.stats1.tp_drops++;
2166 atomic_inc(&sk->sk_drops);
2167 spin_unlock(&sk->sk_receive_queue.lock);
2170 if (skb_head != skb->data && skb_shared(skb)) {
2171 skb->data = skb_head;
2175 if (!is_drop_n_account)
2182 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
2183 struct packet_type *pt, struct net_device *orig_dev)
2186 struct packet_sock *po;
2187 struct sockaddr_ll *sll;
2188 union tpacket_uhdr h;
2189 u8 *skb_head = skb->data;
2190 int skb_len = skb->len;
2191 unsigned int snaplen, res;
2192 unsigned long status = TP_STATUS_USER;
2193 unsigned short macoff, netoff, hdrlen;
2194 struct sk_buff *copy_skb = NULL;
2197 bool is_drop_n_account = false;
2198 bool do_vnet = false;
2200 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
2201 * We may add members to them until current aligned size without forcing
2202 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
2204 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
2205 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
2207 if (skb->pkt_type == PACKET_LOOPBACK)
2210 sk = pt->af_packet_priv;
2213 if (!net_eq(dev_net(dev), sock_net(sk)))
2216 if (dev->header_ops) {
2217 if (sk->sk_type != SOCK_DGRAM)
2218 skb_push(skb, skb->data - skb_mac_header(skb));
2219 else if (skb->pkt_type == PACKET_OUTGOING) {
2220 /* Special case: outgoing packets have ll header at head */
2221 skb_pull(skb, skb_network_offset(skb));
2227 res = run_filter(skb, sk, snaplen);
2229 goto drop_n_restore;
2231 if (skb->ip_summed == CHECKSUM_PARTIAL)
2232 status |= TP_STATUS_CSUMNOTREADY;
2233 else if (skb->pkt_type != PACKET_OUTGOING &&
2234 (skb->ip_summed == CHECKSUM_COMPLETE ||
2235 skb_csum_unnecessary(skb)))
2236 status |= TP_STATUS_CSUM_VALID;
2241 if (sk->sk_type == SOCK_DGRAM) {
2242 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
2245 unsigned int maclen = skb_network_offset(skb);
2246 netoff = TPACKET_ALIGN(po->tp_hdrlen +
2247 (maclen < 16 ? 16 : maclen)) +
2249 if (po->has_vnet_hdr) {
2250 netoff += sizeof(struct virtio_net_hdr);
2253 macoff = netoff - maclen;
2255 if (po->tp_version <= TPACKET_V2) {
2256 if (macoff + snaplen > po->rx_ring.frame_size) {
2257 if (po->copy_thresh &&
2258 atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
2259 if (skb_shared(skb)) {
2260 copy_skb = skb_clone(skb, GFP_ATOMIC);
2262 copy_skb = skb_get(skb);
2263 skb_head = skb->data;
2266 skb_set_owner_r(copy_skb, sk);
2268 snaplen = po->rx_ring.frame_size - macoff;
2269 if ((int)snaplen < 0) {
2274 } else if (unlikely(macoff + snaplen >
2275 GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) {
2278 nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff;
2279 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
2280 snaplen, nval, macoff);
2282 if (unlikely((int)snaplen < 0)) {
2284 macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len;
2288 spin_lock(&sk->sk_receive_queue.lock);
2289 h.raw = packet_current_rx_frame(po, skb,
2290 TP_STATUS_KERNEL, (macoff+snaplen));
2292 goto drop_n_account;
2293 if (po->tp_version <= TPACKET_V2) {
2294 packet_increment_rx_head(po, &po->rx_ring);
2296 * LOSING will be reported till you read the stats,
2297 * because it's COR - Clear On Read.
2298 * Anyways, moving it for V1/V2 only as V3 doesn't need this
2301 if (po->stats.stats1.tp_drops)
2302 status |= TP_STATUS_LOSING;
2304 po->stats.stats1.tp_packets++;
2306 status |= TP_STATUS_COPY;
2307 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
2309 spin_unlock(&sk->sk_receive_queue.lock);
2312 if (virtio_net_hdr_from_skb(skb, h.raw + macoff -
2313 sizeof(struct virtio_net_hdr),
2315 spin_lock(&sk->sk_receive_queue.lock);
2316 goto drop_n_account;
2320 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
2322 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
2323 getnstimeofday(&ts);
2325 status |= ts_status;
2327 switch (po->tp_version) {
2329 h.h1->tp_len = skb->len;
2330 h.h1->tp_snaplen = snaplen;
2331 h.h1->tp_mac = macoff;
2332 h.h1->tp_net = netoff;
2333 h.h1->tp_sec = ts.tv_sec;
2334 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
2335 hdrlen = sizeof(*h.h1);
2338 h.h2->tp_len = skb->len;
2339 h.h2->tp_snaplen = snaplen;
2340 h.h2->tp_mac = macoff;
2341 h.h2->tp_net = netoff;
2342 h.h2->tp_sec = ts.tv_sec;
2343 h.h2->tp_nsec = ts.tv_nsec;
2344 if (skb_vlan_tag_present(skb)) {
2345 h.h2->tp_vlan_tci = skb_vlan_tag_get(skb);
2346 h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto);
2347 status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
2349 h.h2->tp_vlan_tci = 0;
2350 h.h2->tp_vlan_tpid = 0;
2352 memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding));
2353 hdrlen = sizeof(*h.h2);
2356 /* tp_nxt_offset,vlan are already populated above.
2357 * So DONT clear those fields here
2359 h.h3->tp_status |= status;
2360 h.h3->tp_len = skb->len;
2361 h.h3->tp_snaplen = snaplen;
2362 h.h3->tp_mac = macoff;
2363 h.h3->tp_net = netoff;
2364 h.h3->tp_sec = ts.tv_sec;
2365 h.h3->tp_nsec = ts.tv_nsec;
2366 memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding));
2367 hdrlen = sizeof(*h.h3);
2373 sll = h.raw + TPACKET_ALIGN(hdrlen);
2374 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2375 sll->sll_family = AF_PACKET;
2376 sll->sll_hatype = dev->type;
2377 sll->sll_protocol = skb->protocol;
2378 sll->sll_pkttype = skb->pkt_type;
2379 if (unlikely(po->origdev))
2380 sll->sll_ifindex = orig_dev->ifindex;
2382 sll->sll_ifindex = dev->ifindex;
2386 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
2387 if (po->tp_version <= TPACKET_V2) {
2390 end = (u8 *) PAGE_ALIGN((unsigned long) h.raw +
2393 for (start = h.raw; start < end; start += PAGE_SIZE)
2394 flush_dcache_page(pgv_to_page(start));
2399 if (po->tp_version <= TPACKET_V2) {
2400 __packet_set_status(po, h.raw, status);
2401 sk->sk_data_ready(sk);
2403 prb_clear_blk_fill_status(&po->rx_ring);
2407 if (skb_head != skb->data && skb_shared(skb)) {
2408 skb->data = skb_head;
2412 if (!is_drop_n_account)
2419 is_drop_n_account = true;
2420 po->stats.stats1.tp_drops++;
2421 spin_unlock(&sk->sk_receive_queue.lock);
2423 sk->sk_data_ready(sk);
2424 kfree_skb(copy_skb);
2425 goto drop_n_restore;
2428 static void tpacket_destruct_skb(struct sk_buff *skb)
2430 struct packet_sock *po = pkt_sk(skb->sk);
2432 if (likely(po->tx_ring.pg_vec)) {
2436 ph = skb_shinfo(skb)->destructor_arg;
2437 packet_dec_pending(&po->tx_ring);
2439 ts = __packet_set_timestamp(po, ph, skb);
2440 __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts);
2446 static void tpacket_set_protocol(const struct net_device *dev,
2447 struct sk_buff *skb)
2449 if (dev->type == ARPHRD_ETHER) {
2450 skb_reset_mac_header(skb);
2451 skb->protocol = eth_hdr(skb)->h_proto;
2455 static int __packet_snd_vnet_parse(struct virtio_net_hdr *vnet_hdr, size_t len)
2457 if ((vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
2458 (__virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2459 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2 >
2460 __virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len)))
2461 vnet_hdr->hdr_len = __cpu_to_virtio16(vio_le(),
2462 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2463 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2);
2465 if (__virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len) > len)
2471 static int packet_snd_vnet_parse(struct msghdr *msg, size_t *len,
2472 struct virtio_net_hdr *vnet_hdr)
2474 if (*len < sizeof(*vnet_hdr))
2476 *len -= sizeof(*vnet_hdr);
2478 if (!copy_from_iter_full(vnet_hdr, sizeof(*vnet_hdr), &msg->msg_iter))
2481 return __packet_snd_vnet_parse(vnet_hdr, *len);
2484 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
2485 void *frame, struct net_device *dev, void *data, int tp_len,
2486 __be16 proto, unsigned char *addr, int hlen, int copylen,
2487 const struct sockcm_cookie *sockc)
2489 union tpacket_uhdr ph;
2490 int to_write, offset, len, nr_frags, len_max;
2491 struct socket *sock = po->sk.sk_socket;
2497 skb->protocol = proto;
2499 skb->priority = po->sk.sk_priority;
2500 skb->mark = po->sk.sk_mark;
2501 sock_tx_timestamp(&po->sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags);
2502 skb_shinfo(skb)->destructor_arg = ph.raw;
2504 skb_reserve(skb, hlen);
2505 skb_reset_network_header(skb);
2509 if (sock->type == SOCK_DGRAM) {
2510 err = dev_hard_header(skb, dev, ntohs(proto), addr,
2512 if (unlikely(err < 0))
2514 } else if (copylen) {
2515 int hdrlen = min_t(int, copylen, tp_len);
2517 skb_push(skb, dev->hard_header_len);
2518 skb_put(skb, copylen - dev->hard_header_len);
2519 err = skb_store_bits(skb, 0, data, hdrlen);
2522 if (!dev_validate_header(dev, skb->data, hdrlen))
2525 tpacket_set_protocol(dev, skb);
2531 offset = offset_in_page(data);
2532 len_max = PAGE_SIZE - offset;
2533 len = ((to_write > len_max) ? len_max : to_write);
2535 skb->data_len = to_write;
2536 skb->len += to_write;
2537 skb->truesize += to_write;
2538 refcount_add(to_write, &po->sk.sk_wmem_alloc);
2540 while (likely(to_write)) {
2541 nr_frags = skb_shinfo(skb)->nr_frags;
2543 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
2544 pr_err("Packet exceed the number of skb frags(%lu)\n",
2549 page = pgv_to_page(data);
2551 flush_dcache_page(page);
2553 skb_fill_page_desc(skb, nr_frags, page, offset, len);
2556 len_max = PAGE_SIZE;
2557 len = ((to_write > len_max) ? len_max : to_write);
2560 skb_probe_transport_header(skb, 0);
2565 static int tpacket_parse_header(struct packet_sock *po, void *frame,
2566 int size_max, void **data)
2568 union tpacket_uhdr ph;
2573 switch (po->tp_version) {
2575 if (ph.h3->tp_next_offset != 0) {
2576 pr_warn_once("variable sized slot not supported");
2579 tp_len = ph.h3->tp_len;
2582 tp_len = ph.h2->tp_len;
2585 tp_len = ph.h1->tp_len;
2588 if (unlikely(tp_len > size_max)) {
2589 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
2593 if (unlikely(po->tp_tx_has_off)) {
2594 int off_min, off_max;
2596 off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2597 off_max = po->tx_ring.frame_size - tp_len;
2598 if (po->sk.sk_type == SOCK_DGRAM) {
2599 switch (po->tp_version) {
2601 off = ph.h3->tp_net;
2604 off = ph.h2->tp_net;
2607 off = ph.h1->tp_net;
2611 switch (po->tp_version) {
2613 off = ph.h3->tp_mac;
2616 off = ph.h2->tp_mac;
2619 off = ph.h1->tp_mac;
2623 if (unlikely((off < off_min) || (off_max < off)))
2626 off = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2629 *data = frame + off;
2633 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
2635 struct sk_buff *skb;
2636 struct net_device *dev;
2637 struct virtio_net_hdr *vnet_hdr = NULL;
2638 struct sockcm_cookie sockc;
2640 int err, reserve = 0;
2642 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2643 bool need_wait = !(msg->msg_flags & MSG_DONTWAIT);
2644 int tp_len, size_max;
2645 unsigned char *addr;
2648 int status = TP_STATUS_AVAILABLE;
2649 int hlen, tlen, copylen = 0;
2651 mutex_lock(&po->pg_vec_lock);
2653 if (likely(saddr == NULL)) {
2654 dev = packet_cached_dev_get(po);
2659 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2661 if (msg->msg_namelen < (saddr->sll_halen
2662 + offsetof(struct sockaddr_ll,
2665 proto = saddr->sll_protocol;
2666 addr = saddr->sll_addr;
2667 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
2671 if (unlikely(dev == NULL))
2674 if (unlikely(!(dev->flags & IFF_UP)))
2677 sockc.tsflags = po->sk.sk_tsflags;
2678 if (msg->msg_controllen) {
2679 err = sock_cmsg_send(&po->sk, msg, &sockc);
2684 if (po->sk.sk_socket->type == SOCK_RAW)
2685 reserve = dev->hard_header_len;
2686 size_max = po->tx_ring.frame_size
2687 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
2689 if ((size_max > dev->mtu + reserve + VLAN_HLEN) && !po->has_vnet_hdr)
2690 size_max = dev->mtu + reserve + VLAN_HLEN;
2693 ph = packet_current_frame(po, &po->tx_ring,
2694 TP_STATUS_SEND_REQUEST);
2695 if (unlikely(ph == NULL)) {
2696 if (need_wait && need_resched())
2702 tp_len = tpacket_parse_header(po, ph, size_max, &data);
2706 status = TP_STATUS_SEND_REQUEST;
2707 hlen = LL_RESERVED_SPACE(dev);
2708 tlen = dev->needed_tailroom;
2709 if (po->has_vnet_hdr) {
2711 data += sizeof(*vnet_hdr);
2712 tp_len -= sizeof(*vnet_hdr);
2714 __packet_snd_vnet_parse(vnet_hdr, tp_len)) {
2718 copylen = __virtio16_to_cpu(vio_le(),
2721 copylen = max_t(int, copylen, dev->hard_header_len);
2722 skb = sock_alloc_send_skb(&po->sk,
2723 hlen + tlen + sizeof(struct sockaddr_ll) +
2724 (copylen - dev->hard_header_len),
2727 if (unlikely(skb == NULL)) {
2728 /* we assume the socket was initially writeable ... */
2729 if (likely(len_sum > 0))
2733 tp_len = tpacket_fill_skb(po, skb, ph, dev, data, tp_len, proto,
2734 addr, hlen, copylen, &sockc);
2735 if (likely(tp_len >= 0) &&
2736 tp_len > dev->mtu + reserve &&
2737 !po->has_vnet_hdr &&
2738 !packet_extra_vlan_len_allowed(dev, skb))
2741 if (unlikely(tp_len < 0)) {
2744 __packet_set_status(po, ph,
2745 TP_STATUS_AVAILABLE);
2746 packet_increment_head(&po->tx_ring);
2750 status = TP_STATUS_WRONG_FORMAT;
2756 if (po->has_vnet_hdr && virtio_net_hdr_to_skb(skb, vnet_hdr,
2762 skb->destructor = tpacket_destruct_skb;
2763 __packet_set_status(po, ph, TP_STATUS_SENDING);
2764 packet_inc_pending(&po->tx_ring);
2766 status = TP_STATUS_SEND_REQUEST;
2767 err = po->xmit(skb);
2768 if (unlikely(err > 0)) {
2769 err = net_xmit_errno(err);
2770 if (err && __packet_get_status(po, ph) ==
2771 TP_STATUS_AVAILABLE) {
2772 /* skb was destructed already */
2777 * skb was dropped but not destructed yet;
2778 * let's treat it like congestion or err < 0
2782 packet_increment_head(&po->tx_ring);
2784 } while (likely((ph != NULL) ||
2785 /* Note: packet_read_pending() might be slow if we have
2786 * to call it as it's per_cpu variable, but in fast-path
2787 * we already short-circuit the loop with the first
2788 * condition, and luckily don't have to go that path
2791 (need_wait && packet_read_pending(&po->tx_ring))));
2797 __packet_set_status(po, ph, status);
2802 mutex_unlock(&po->pg_vec_lock);
2806 static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
2807 size_t reserve, size_t len,
2808 size_t linear, int noblock,
2811 struct sk_buff *skb;
2813 /* Under a page? Don't bother with paged skb. */
2814 if (prepad + len < PAGE_SIZE || !linear)
2817 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
2822 skb_reserve(skb, reserve);
2823 skb_put(skb, linear);
2824 skb->data_len = len - linear;
2825 skb->len += len - linear;
2830 static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
2832 struct sock *sk = sock->sk;
2833 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2834 struct sk_buff *skb;
2835 struct net_device *dev;
2837 unsigned char *addr;
2838 int err, reserve = 0;
2839 struct sockcm_cookie sockc;
2840 struct virtio_net_hdr vnet_hdr = { 0 };
2842 struct packet_sock *po = pkt_sk(sk);
2843 bool has_vnet_hdr = false;
2844 int hlen, tlen, linear;
2848 * Get and verify the address.
2851 if (likely(saddr == NULL)) {
2852 dev = packet_cached_dev_get(po);
2857 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2859 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
2861 proto = saddr->sll_protocol;
2862 addr = saddr->sll_addr;
2863 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
2867 if (unlikely(dev == NULL))
2870 if (unlikely(!(dev->flags & IFF_UP)))
2873 sockc.tsflags = sk->sk_tsflags;
2874 sockc.mark = sk->sk_mark;
2875 if (msg->msg_controllen) {
2876 err = sock_cmsg_send(sk, msg, &sockc);
2881 if (sock->type == SOCK_RAW)
2882 reserve = dev->hard_header_len;
2883 if (po->has_vnet_hdr) {
2884 err = packet_snd_vnet_parse(msg, &len, &vnet_hdr);
2887 has_vnet_hdr = true;
2890 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
2891 if (!netif_supports_nofcs(dev)) {
2892 err = -EPROTONOSUPPORT;
2895 extra_len = 4; /* We're doing our own CRC */
2899 if (!vnet_hdr.gso_type &&
2900 (len > dev->mtu + reserve + VLAN_HLEN + extra_len))
2904 hlen = LL_RESERVED_SPACE(dev);
2905 tlen = dev->needed_tailroom;
2906 linear = __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len);
2907 linear = max(linear, min_t(int, len, dev->hard_header_len));
2908 skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, linear,
2909 msg->msg_flags & MSG_DONTWAIT, &err);
2913 skb_set_network_header(skb, reserve);
2916 if (sock->type == SOCK_DGRAM) {
2917 offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len);
2918 if (unlikely(offset < 0))
2922 /* Returns -EFAULT on error */
2923 err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len);
2927 if (sock->type == SOCK_RAW &&
2928 !dev_validate_header(dev, skb->data, len)) {
2933 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
2935 if (!vnet_hdr.gso_type && (len > dev->mtu + reserve + extra_len) &&
2936 !packet_extra_vlan_len_allowed(dev, skb)) {
2941 skb->protocol = proto;
2943 skb->priority = sk->sk_priority;
2944 skb->mark = sockc.mark;
2947 err = virtio_net_hdr_to_skb(skb, &vnet_hdr, vio_le());
2950 len += sizeof(vnet_hdr);
2953 skb_probe_transport_header(skb, reserve);
2955 if (unlikely(extra_len == 4))
2958 err = po->xmit(skb);
2959 if (err > 0 && (err = net_xmit_errno(err)) != 0)
2975 static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2977 struct sock *sk = sock->sk;
2978 struct packet_sock *po = pkt_sk(sk);
2980 if (po->tx_ring.pg_vec)
2981 return tpacket_snd(po, msg);
2983 return packet_snd(sock, msg, len);
2987 * Close a PACKET socket. This is fairly simple. We immediately go
2988 * to 'closed' state and remove our protocol entry in the device list.
2991 static int packet_release(struct socket *sock)
2993 struct sock *sk = sock->sk;
2994 struct packet_sock *po;
2995 struct packet_fanout *f;
2997 union tpacket_req_u req_u;
3005 mutex_lock(&net->packet.sklist_lock);
3006 sk_del_node_init_rcu(sk);
3007 mutex_unlock(&net->packet.sklist_lock);
3010 sock_prot_inuse_add(net, sk->sk_prot, -1);
3013 spin_lock(&po->bind_lock);
3014 unregister_prot_hook(sk, false);
3015 packet_cached_dev_reset(po);
3017 if (po->prot_hook.dev) {
3018 dev_put(po->prot_hook.dev);
3019 po->prot_hook.dev = NULL;
3021 spin_unlock(&po->bind_lock);
3023 packet_flush_mclist(sk);
3025 if (po->rx_ring.pg_vec) {
3026 memset(&req_u, 0, sizeof(req_u));
3027 packet_set_ring(sk, &req_u, 1, 0);
3030 if (po->tx_ring.pg_vec) {
3031 memset(&req_u, 0, sizeof(req_u));
3032 packet_set_ring(sk, &req_u, 1, 1);
3035 f = fanout_release(sk);
3040 fanout_release_data(f);
3044 * Now the socket is dead. No more input will appear.
3051 skb_queue_purge(&sk->sk_receive_queue);
3052 packet_free_pending(po);
3053 sk_refcnt_debug_release(sk);
3060 * Attach a packet hook.
3063 static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
3066 struct packet_sock *po = pkt_sk(sk);
3067 struct net_device *dev_curr;
3070 struct net_device *dev = NULL;
3072 bool unlisted = false;
3075 spin_lock(&po->bind_lock);
3084 dev = dev_get_by_name_rcu(sock_net(sk), name);
3089 } else if (ifindex) {
3090 dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
3100 proto_curr = po->prot_hook.type;
3101 dev_curr = po->prot_hook.dev;
3103 need_rehook = proto_curr != proto || dev_curr != dev;
3108 __unregister_prot_hook(sk, true);
3110 dev_curr = po->prot_hook.dev;
3112 unlisted = !dev_get_by_index_rcu(sock_net(sk),
3117 po->prot_hook.type = proto;
3119 if (unlikely(unlisted)) {
3121 po->prot_hook.dev = NULL;
3123 packet_cached_dev_reset(po);
3125 po->prot_hook.dev = dev;
3126 po->ifindex = dev ? dev->ifindex : 0;
3127 packet_cached_dev_assign(po, dev);
3133 if (proto == 0 || !need_rehook)
3136 if (!unlisted && (!dev || (dev->flags & IFF_UP))) {
3137 register_prot_hook(sk);
3139 sk->sk_err = ENETDOWN;
3140 if (!sock_flag(sk, SOCK_DEAD))
3141 sk->sk_error_report(sk);
3146 spin_unlock(&po->bind_lock);
3152 * Bind a packet socket to a device
3155 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
3158 struct sock *sk = sock->sk;
3159 char name[sizeof(uaddr->sa_data) + 1];
3165 if (addr_len != sizeof(struct sockaddr))
3167 /* uaddr->sa_data comes from the userspace, it's not guaranteed to be
3170 memcpy(name, uaddr->sa_data, sizeof(uaddr->sa_data));
3171 name[sizeof(uaddr->sa_data)] = 0;
3173 return packet_do_bind(sk, name, 0, pkt_sk(sk)->num);
3176 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
3178 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
3179 struct sock *sk = sock->sk;
3185 if (addr_len < sizeof(struct sockaddr_ll))
3187 if (sll->sll_family != AF_PACKET)
3190 return packet_do_bind(sk, NULL, sll->sll_ifindex,
3191 sll->sll_protocol ? : pkt_sk(sk)->num);
3194 static struct proto packet_proto = {
3196 .owner = THIS_MODULE,
3197 .obj_size = sizeof(struct packet_sock),
3201 * Create a packet of type SOCK_PACKET.
3204 static int packet_create(struct net *net, struct socket *sock, int protocol,
3208 struct packet_sock *po;
3209 __be16 proto = (__force __be16)protocol; /* weird, but documented */
3212 if (!ns_capable(net->user_ns, CAP_NET_RAW))
3214 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
3215 sock->type != SOCK_PACKET)
3216 return -ESOCKTNOSUPPORT;
3218 sock->state = SS_UNCONNECTED;
3221 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto, kern);
3225 sock->ops = &packet_ops;
3226 if (sock->type == SOCK_PACKET)
3227 sock->ops = &packet_ops_spkt;
3229 sock_init_data(sock, sk);
3232 sk->sk_family = PF_PACKET;
3234 po->xmit = dev_queue_xmit;
3236 err = packet_alloc_pending(po);
3240 packet_cached_dev_reset(po);
3242 sk->sk_destruct = packet_sock_destruct;
3243 sk_refcnt_debug_inc(sk);
3246 * Attach a protocol block
3249 spin_lock_init(&po->bind_lock);
3250 mutex_init(&po->pg_vec_lock);
3251 po->rollover = NULL;
3252 po->prot_hook.func = packet_rcv;
3254 if (sock->type == SOCK_PACKET)
3255 po->prot_hook.func = packet_rcv_spkt;
3257 po->prot_hook.af_packet_priv = sk;
3260 po->prot_hook.type = proto;
3261 register_prot_hook(sk);
3264 mutex_lock(&net->packet.sklist_lock);
3265 sk_add_node_rcu(sk, &net->packet.sklist);
3266 mutex_unlock(&net->packet.sklist_lock);
3269 sock_prot_inuse_add(net, &packet_proto, 1);
3280 * Pull a packet from our receive queue and hand it to the user.
3281 * If necessary we block.
3284 static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3287 struct sock *sk = sock->sk;
3288 struct sk_buff *skb;
3290 int vnet_hdr_len = 0;
3291 unsigned int origlen = 0;
3294 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
3298 /* What error should we return now? EUNATTACH? */
3299 if (pkt_sk(sk)->ifindex < 0)
3303 if (flags & MSG_ERRQUEUE) {
3304 err = sock_recv_errqueue(sk, msg, len,
3305 SOL_PACKET, PACKET_TX_TIMESTAMP);
3310 * Call the generic datagram receiver. This handles all sorts
3311 * of horrible races and re-entrancy so we can forget about it
3312 * in the protocol layers.
3314 * Now it will return ENETDOWN, if device have just gone down,
3315 * but then it will block.
3318 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3321 * An error occurred so return it. Because skb_recv_datagram()
3322 * handles the blocking we don't see and worry about blocking
3329 if (pkt_sk(sk)->pressure)
3330 packet_rcv_has_room(pkt_sk(sk), NULL);
3332 if (pkt_sk(sk)->has_vnet_hdr) {
3333 err = packet_rcv_vnet(msg, skb, &len);
3336 vnet_hdr_len = sizeof(struct virtio_net_hdr);
3339 /* You lose any data beyond the buffer you gave. If it worries
3340 * a user program they can ask the device for its MTU
3346 msg->msg_flags |= MSG_TRUNC;
3349 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3353 if (sock->type != SOCK_PACKET) {
3354 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3356 /* Original length was stored in sockaddr_ll fields */
3357 origlen = PACKET_SKB_CB(skb)->sa.origlen;
3358 sll->sll_family = AF_PACKET;
3359 sll->sll_protocol = skb->protocol;
3362 sock_recv_ts_and_drops(msg, sk, skb);
3364 if (msg->msg_name) {
3365 /* If the address length field is there to be filled
3366 * in, we fill it in now.
3368 if (sock->type == SOCK_PACKET) {
3369 __sockaddr_check_size(sizeof(struct sockaddr_pkt));
3370 msg->msg_namelen = sizeof(struct sockaddr_pkt);
3372 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3374 msg->msg_namelen = sll->sll_halen +
3375 offsetof(struct sockaddr_ll, sll_addr);
3377 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
3381 if (pkt_sk(sk)->auxdata) {
3382 struct tpacket_auxdata aux;
3384 aux.tp_status = TP_STATUS_USER;
3385 if (skb->ip_summed == CHECKSUM_PARTIAL)
3386 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
3387 else if (skb->pkt_type != PACKET_OUTGOING &&
3388 (skb->ip_summed == CHECKSUM_COMPLETE ||
3389 skb_csum_unnecessary(skb)))
3390 aux.tp_status |= TP_STATUS_CSUM_VALID;
3392 aux.tp_len = origlen;
3393 aux.tp_snaplen = skb->len;
3395 aux.tp_net = skb_network_offset(skb);
3396 if (skb_vlan_tag_present(skb)) {
3397 aux.tp_vlan_tci = skb_vlan_tag_get(skb);
3398 aux.tp_vlan_tpid = ntohs(skb->vlan_proto);
3399 aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
3401 aux.tp_vlan_tci = 0;
3402 aux.tp_vlan_tpid = 0;
3404 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
3408 * Free or return the buffer as appropriate. Again this
3409 * hides all the races and re-entrancy issues from us.
3411 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
3414 skb_free_datagram(sk, skb);
3419 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
3420 int *uaddr_len, int peer)
3422 struct net_device *dev;
3423 struct sock *sk = sock->sk;
3428 uaddr->sa_family = AF_PACKET;
3429 memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
3431 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
3433 strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
3435 *uaddr_len = sizeof(*uaddr);
3440 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
3441 int *uaddr_len, int peer)
3443 struct net_device *dev;
3444 struct sock *sk = sock->sk;
3445 struct packet_sock *po = pkt_sk(sk);
3446 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
3451 sll->sll_family = AF_PACKET;
3452 sll->sll_ifindex = po->ifindex;
3453 sll->sll_protocol = po->num;
3454 sll->sll_pkttype = 0;
3456 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
3458 sll->sll_hatype = dev->type;
3459 sll->sll_halen = dev->addr_len;
3460 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
3462 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
3466 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
3471 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
3475 case PACKET_MR_MULTICAST:
3476 if (i->alen != dev->addr_len)
3479 return dev_mc_add(dev, i->addr);
3481 return dev_mc_del(dev, i->addr);
3483 case PACKET_MR_PROMISC:
3484 return dev_set_promiscuity(dev, what);
3485 case PACKET_MR_ALLMULTI:
3486 return dev_set_allmulti(dev, what);
3487 case PACKET_MR_UNICAST:
3488 if (i->alen != dev->addr_len)
3491 return dev_uc_add(dev, i->addr);
3493 return dev_uc_del(dev, i->addr);
3501 static void packet_dev_mclist_delete(struct net_device *dev,
3502 struct packet_mclist **mlp)
3504 struct packet_mclist *ml;
3506 while ((ml = *mlp) != NULL) {
3507 if (ml->ifindex == dev->ifindex) {
3508 packet_dev_mc(dev, ml, -1);
3516 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
3518 struct packet_sock *po = pkt_sk(sk);
3519 struct packet_mclist *ml, *i;
3520 struct net_device *dev;
3526 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
3531 if (mreq->mr_alen > dev->addr_len)
3535 i = kmalloc(sizeof(*i), GFP_KERNEL);
3540 for (ml = po->mclist; ml; ml = ml->next) {
3541 if (ml->ifindex == mreq->mr_ifindex &&
3542 ml->type == mreq->mr_type &&
3543 ml->alen == mreq->mr_alen &&
3544 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3546 /* Free the new element ... */
3552 i->type = mreq->mr_type;
3553 i->ifindex = mreq->mr_ifindex;
3554 i->alen = mreq->mr_alen;
3555 memcpy(i->addr, mreq->mr_address, i->alen);
3556 memset(i->addr + i->alen, 0, sizeof(i->addr) - i->alen);
3558 i->next = po->mclist;
3560 err = packet_dev_mc(dev, i, 1);
3562 po->mclist = i->next;
3571 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
3573 struct packet_mclist *ml, **mlp;
3577 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
3578 if (ml->ifindex == mreq->mr_ifindex &&
3579 ml->type == mreq->mr_type &&
3580 ml->alen == mreq->mr_alen &&
3581 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3582 if (--ml->count == 0) {
3583 struct net_device *dev;
3585 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3587 packet_dev_mc(dev, ml, -1);
3597 static void packet_flush_mclist(struct sock *sk)
3599 struct packet_sock *po = pkt_sk(sk);
3600 struct packet_mclist *ml;
3606 while ((ml = po->mclist) != NULL) {
3607 struct net_device *dev;
3609 po->mclist = ml->next;
3610 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3612 packet_dev_mc(dev, ml, -1);
3619 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
3621 struct sock *sk = sock->sk;
3622 struct packet_sock *po = pkt_sk(sk);
3625 if (level != SOL_PACKET)
3626 return -ENOPROTOOPT;
3629 case PACKET_ADD_MEMBERSHIP:
3630 case PACKET_DROP_MEMBERSHIP:
3632 struct packet_mreq_max mreq;
3634 memset(&mreq, 0, sizeof(mreq));
3635 if (len < sizeof(struct packet_mreq))
3637 if (len > sizeof(mreq))
3639 if (copy_from_user(&mreq, optval, len))
3641 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
3643 if (optname == PACKET_ADD_MEMBERSHIP)
3644 ret = packet_mc_add(sk, &mreq);
3646 ret = packet_mc_drop(sk, &mreq);
3650 case PACKET_RX_RING:
3651 case PACKET_TX_RING:
3653 union tpacket_req_u req_u;
3656 switch (po->tp_version) {
3659 len = sizeof(req_u.req);
3663 len = sizeof(req_u.req3);
3668 if (copy_from_user(&req_u.req, optval, len))
3670 return packet_set_ring(sk, &req_u, 0,
3671 optname == PACKET_TX_RING);
3673 case PACKET_COPY_THRESH:
3677 if (optlen != sizeof(val))
3679 if (copy_from_user(&val, optval, sizeof(val)))
3682 pkt_sk(sk)->copy_thresh = val;
3685 case PACKET_VERSION:
3689 if (optlen != sizeof(val))
3691 if (copy_from_user(&val, optval, sizeof(val)))
3702 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3705 po->tp_version = val;
3711 case PACKET_RESERVE:
3715 if (optlen != sizeof(val))
3717 if (copy_from_user(&val, optval, sizeof(val)))
3722 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3725 po->tp_reserve = val;
3735 if (optlen != sizeof(val))
3737 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3739 if (copy_from_user(&val, optval, sizeof(val)))
3741 po->tp_loss = !!val;
3744 case PACKET_AUXDATA:
3748 if (optlen < sizeof(val))
3750 if (copy_from_user(&val, optval, sizeof(val)))
3753 po->auxdata = !!val;
3756 case PACKET_ORIGDEV:
3760 if (optlen < sizeof(val))
3762 if (copy_from_user(&val, optval, sizeof(val)))
3765 po->origdev = !!val;
3768 case PACKET_VNET_HDR:
3772 if (sock->type != SOCK_RAW)
3774 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3776 if (optlen < sizeof(val))
3778 if (copy_from_user(&val, optval, sizeof(val)))
3781 po->has_vnet_hdr = !!val;
3784 case PACKET_TIMESTAMP:
3788 if (optlen != sizeof(val))
3790 if (copy_from_user(&val, optval, sizeof(val)))
3793 po->tp_tstamp = val;
3800 if (optlen != sizeof(val))
3802 if (copy_from_user(&val, optval, sizeof(val)))
3805 return fanout_add(sk, val & 0xffff, val >> 16);
3807 case PACKET_FANOUT_DATA:
3812 return fanout_set_data(po, optval, optlen);
3814 case PACKET_TX_HAS_OFF:
3818 if (optlen != sizeof(val))
3820 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3822 if (copy_from_user(&val, optval, sizeof(val)))
3824 po->tp_tx_has_off = !!val;
3827 case PACKET_QDISC_BYPASS:
3831 if (optlen != sizeof(val))
3833 if (copy_from_user(&val, optval, sizeof(val)))
3836 po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
3840 return -ENOPROTOOPT;
3844 static int packet_getsockopt(struct socket *sock, int level, int optname,
3845 char __user *optval, int __user *optlen)
3848 int val, lv = sizeof(val);
3849 struct sock *sk = sock->sk;
3850 struct packet_sock *po = pkt_sk(sk);
3852 union tpacket_stats_u st;
3853 struct tpacket_rollover_stats rstats;
3855 if (level != SOL_PACKET)
3856 return -ENOPROTOOPT;
3858 if (get_user(len, optlen))
3865 case PACKET_STATISTICS:
3866 spin_lock_bh(&sk->sk_receive_queue.lock);
3867 memcpy(&st, &po->stats, sizeof(st));
3868 memset(&po->stats, 0, sizeof(po->stats));
3869 spin_unlock_bh(&sk->sk_receive_queue.lock);
3871 if (po->tp_version == TPACKET_V3) {
3872 lv = sizeof(struct tpacket_stats_v3);
3873 st.stats3.tp_packets += st.stats3.tp_drops;
3876 lv = sizeof(struct tpacket_stats);
3877 st.stats1.tp_packets += st.stats1.tp_drops;
3882 case PACKET_AUXDATA:
3885 case PACKET_ORIGDEV:
3888 case PACKET_VNET_HDR:
3889 val = po->has_vnet_hdr;
3891 case PACKET_VERSION:
3892 val = po->tp_version;
3895 if (len > sizeof(int))
3897 if (len < sizeof(int))
3899 if (copy_from_user(&val, optval, len))
3903 val = sizeof(struct tpacket_hdr);
3906 val = sizeof(struct tpacket2_hdr);
3909 val = sizeof(struct tpacket3_hdr);
3915 case PACKET_RESERVE:
3916 val = po->tp_reserve;
3921 case PACKET_TIMESTAMP:
3922 val = po->tp_tstamp;
3926 ((u32)po->fanout->id |
3927 ((u32)po->fanout->type << 16) |
3928 ((u32)po->fanout->flags << 24)) :
3931 case PACKET_ROLLOVER_STATS:
3934 rstats.tp_all = atomic_long_read(&po->rollover->num);
3935 rstats.tp_huge = atomic_long_read(&po->rollover->num_huge);
3936 rstats.tp_failed = atomic_long_read(&po->rollover->num_failed);
3938 lv = sizeof(rstats);
3940 case PACKET_TX_HAS_OFF:
3941 val = po->tp_tx_has_off;
3943 case PACKET_QDISC_BYPASS:
3944 val = packet_use_direct_xmit(po);
3947 return -ENOPROTOOPT;
3952 if (put_user(len, optlen))
3954 if (copy_to_user(optval, data, len))
3960 #ifdef CONFIG_COMPAT
3961 static int compat_packet_setsockopt(struct socket *sock, int level, int optname,
3962 char __user *optval, unsigned int optlen)
3964 struct packet_sock *po = pkt_sk(sock->sk);
3966 if (level != SOL_PACKET)
3967 return -ENOPROTOOPT;
3969 if (optname == PACKET_FANOUT_DATA &&
3970 po->fanout && po->fanout->type == PACKET_FANOUT_CBPF) {
3971 optval = (char __user *)get_compat_bpf_fprog(optval);
3974 optlen = sizeof(struct sock_fprog);
3977 return packet_setsockopt(sock, level, optname, optval, optlen);
3981 static int packet_notifier(struct notifier_block *this,
3982 unsigned long msg, void *ptr)
3985 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3986 struct net *net = dev_net(dev);
3989 sk_for_each_rcu(sk, &net->packet.sklist) {
3990 struct packet_sock *po = pkt_sk(sk);
3993 case NETDEV_UNREGISTER:
3995 packet_dev_mclist_delete(dev, &po->mclist);
3999 if (dev->ifindex == po->ifindex) {
4000 spin_lock(&po->bind_lock);
4002 __unregister_prot_hook(sk, false);
4003 sk->sk_err = ENETDOWN;
4004 if (!sock_flag(sk, SOCK_DEAD))
4005 sk->sk_error_report(sk);
4007 if (msg == NETDEV_UNREGISTER) {
4008 packet_cached_dev_reset(po);
4010 if (po->prot_hook.dev)
4011 dev_put(po->prot_hook.dev);
4012 po->prot_hook.dev = NULL;
4014 spin_unlock(&po->bind_lock);
4018 if (dev->ifindex == po->ifindex) {
4019 spin_lock(&po->bind_lock);
4021 register_prot_hook(sk);
4022 spin_unlock(&po->bind_lock);
4032 static int packet_ioctl(struct socket *sock, unsigned int cmd,
4035 struct sock *sk = sock->sk;
4040 int amount = sk_wmem_alloc_get(sk);
4042 return put_user(amount, (int __user *)arg);
4046 struct sk_buff *skb;
4049 spin_lock_bh(&sk->sk_receive_queue.lock);
4050 skb = skb_peek(&sk->sk_receive_queue);
4053 spin_unlock_bh(&sk->sk_receive_queue.lock);
4054 return put_user(amount, (int __user *)arg);
4057 return sock_get_timestamp(sk, (struct timeval __user *)arg);
4059 return sock_get_timestampns(sk, (struct timespec __user *)arg);
4069 case SIOCGIFBRDADDR:
4070 case SIOCSIFBRDADDR:
4071 case SIOCGIFNETMASK:
4072 case SIOCSIFNETMASK:
4073 case SIOCGIFDSTADDR:
4074 case SIOCSIFDSTADDR:
4076 return inet_dgram_ops.ioctl(sock, cmd, arg);
4080 return -ENOIOCTLCMD;
4085 static unsigned int packet_poll(struct file *file, struct socket *sock,
4088 struct sock *sk = sock->sk;
4089 struct packet_sock *po = pkt_sk(sk);
4090 unsigned int mask = datagram_poll(file, sock, wait);
4092 spin_lock_bh(&sk->sk_receive_queue.lock);
4093 if (po->rx_ring.pg_vec) {
4094 if (!packet_previous_rx_frame(po, &po->rx_ring,
4096 mask |= POLLIN | POLLRDNORM;
4098 if (po->pressure && __packet_rcv_has_room(po, NULL) == ROOM_NORMAL)
4100 spin_unlock_bh(&sk->sk_receive_queue.lock);
4101 spin_lock_bh(&sk->sk_write_queue.lock);
4102 if (po->tx_ring.pg_vec) {
4103 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
4104 mask |= POLLOUT | POLLWRNORM;
4106 spin_unlock_bh(&sk->sk_write_queue.lock);
4111 /* Dirty? Well, I still did not learn better way to account
4115 static void packet_mm_open(struct vm_area_struct *vma)
4117 struct file *file = vma->vm_file;
4118 struct socket *sock = file->private_data;
4119 struct sock *sk = sock->sk;
4122 atomic_inc(&pkt_sk(sk)->mapped);
4125 static void packet_mm_close(struct vm_area_struct *vma)
4127 struct file *file = vma->vm_file;
4128 struct socket *sock = file->private_data;
4129 struct sock *sk = sock->sk;
4132 atomic_dec(&pkt_sk(sk)->mapped);
4135 static const struct vm_operations_struct packet_mmap_ops = {
4136 .open = packet_mm_open,
4137 .close = packet_mm_close,
4140 static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
4145 for (i = 0; i < len; i++) {
4146 if (likely(pg_vec[i].buffer)) {
4147 if (is_vmalloc_addr(pg_vec[i].buffer))
4148 vfree(pg_vec[i].buffer);
4150 free_pages((unsigned long)pg_vec[i].buffer,
4152 pg_vec[i].buffer = NULL;
4158 static char *alloc_one_pg_vec_page(unsigned long order)
4161 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
4162 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
4164 buffer = (char *) __get_free_pages(gfp_flags, order);
4168 /* __get_free_pages failed, fall back to vmalloc */
4169 buffer = vzalloc((1 << order) * PAGE_SIZE);
4173 /* vmalloc failed, lets dig into swap here */
4174 gfp_flags &= ~__GFP_NORETRY;
4175 buffer = (char *) __get_free_pages(gfp_flags, order);
4179 /* complete and utter failure */
4183 static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
4185 unsigned int block_nr = req->tp_block_nr;
4189 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
4190 if (unlikely(!pg_vec))
4193 for (i = 0; i < block_nr; i++) {
4194 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
4195 if (unlikely(!pg_vec[i].buffer))
4196 goto out_free_pgvec;
4203 free_pg_vec(pg_vec, order, block_nr);
4208 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
4209 int closing, int tx_ring)
4211 struct pgv *pg_vec = NULL;
4212 struct packet_sock *po = pkt_sk(sk);
4213 int was_running, order = 0;
4214 struct packet_ring_buffer *rb;
4215 struct sk_buff_head *rb_queue;
4218 /* Added to avoid minimal code churn */
4219 struct tpacket_req *req = &req_u->req;
4223 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
4224 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
4228 if (atomic_read(&po->mapped))
4230 if (packet_read_pending(rb))
4234 if (req->tp_block_nr) {
4235 /* Sanity tests and some calculations */
4237 if (unlikely(rb->pg_vec))
4240 switch (po->tp_version) {
4242 po->tp_hdrlen = TPACKET_HDRLEN;
4245 po->tp_hdrlen = TPACKET2_HDRLEN;
4248 po->tp_hdrlen = TPACKET3_HDRLEN;
4253 if (unlikely((int)req->tp_block_size <= 0))
4255 if (unlikely(!PAGE_ALIGNED(req->tp_block_size)))
4257 if (po->tp_version >= TPACKET_V3 &&
4258 req->tp_block_size <=
4259 BLK_PLUS_PRIV((u64)req_u->req3.tp_sizeof_priv))
4261 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
4264 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
4267 rb->frames_per_block = req->tp_block_size / req->tp_frame_size;
4268 if (unlikely(rb->frames_per_block == 0))
4270 if (unlikely(req->tp_block_size > UINT_MAX / req->tp_block_nr))
4272 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
4277 order = get_order(req->tp_block_size);
4278 pg_vec = alloc_pg_vec(req, order);
4279 if (unlikely(!pg_vec))
4281 switch (po->tp_version) {
4283 /* Block transmit is not supported yet */
4285 init_prb_bdqc(po, rb, pg_vec, req_u);
4287 struct tpacket_req3 *req3 = &req_u->req3;
4289 if (req3->tp_retire_blk_tov ||
4290 req3->tp_sizeof_priv ||
4291 req3->tp_feature_req_word) {
4304 if (unlikely(req->tp_frame_nr))
4309 /* Detach socket from network */
4310 spin_lock(&po->bind_lock);
4311 was_running = po->running;
4315 __unregister_prot_hook(sk, false);
4317 spin_unlock(&po->bind_lock);
4322 mutex_lock(&po->pg_vec_lock);
4323 if (closing || atomic_read(&po->mapped) == 0) {
4325 spin_lock_bh(&rb_queue->lock);
4326 swap(rb->pg_vec, pg_vec);
4327 rb->frame_max = (req->tp_frame_nr - 1);
4329 rb->frame_size = req->tp_frame_size;
4330 spin_unlock_bh(&rb_queue->lock);
4332 swap(rb->pg_vec_order, order);
4333 swap(rb->pg_vec_len, req->tp_block_nr);
4335 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
4336 po->prot_hook.func = (po->rx_ring.pg_vec) ?
4337 tpacket_rcv : packet_rcv;
4338 skb_queue_purge(rb_queue);
4339 if (atomic_read(&po->mapped))
4340 pr_err("packet_mmap: vma is busy: %d\n",
4341 atomic_read(&po->mapped));
4343 mutex_unlock(&po->pg_vec_lock);
4345 spin_lock(&po->bind_lock);
4348 register_prot_hook(sk);
4350 spin_unlock(&po->bind_lock);
4351 if (pg_vec && (po->tp_version > TPACKET_V2)) {
4352 /* Because we don't support block-based V3 on tx-ring */
4354 prb_shutdown_retire_blk_timer(po, rb_queue);
4358 free_pg_vec(pg_vec, order, req->tp_block_nr);
4364 static int packet_mmap(struct file *file, struct socket *sock,
4365 struct vm_area_struct *vma)
4367 struct sock *sk = sock->sk;
4368 struct packet_sock *po = pkt_sk(sk);
4369 unsigned long size, expected_size;
4370 struct packet_ring_buffer *rb;
4371 unsigned long start;
4378 mutex_lock(&po->pg_vec_lock);
4381 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4383 expected_size += rb->pg_vec_len
4389 if (expected_size == 0)
4392 size = vma->vm_end - vma->vm_start;
4393 if (size != expected_size)
4396 start = vma->vm_start;
4397 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4398 if (rb->pg_vec == NULL)
4401 for (i = 0; i < rb->pg_vec_len; i++) {
4403 void *kaddr = rb->pg_vec[i].buffer;
4406 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
4407 page = pgv_to_page(kaddr);
4408 err = vm_insert_page(vma, start, page);
4417 atomic_inc(&po->mapped);
4418 vma->vm_ops = &packet_mmap_ops;
4422 mutex_unlock(&po->pg_vec_lock);
4426 static const struct proto_ops packet_ops_spkt = {
4427 .family = PF_PACKET,
4428 .owner = THIS_MODULE,
4429 .release = packet_release,
4430 .bind = packet_bind_spkt,
4431 .connect = sock_no_connect,
4432 .socketpair = sock_no_socketpair,
4433 .accept = sock_no_accept,
4434 .getname = packet_getname_spkt,
4435 .poll = datagram_poll,
4436 .ioctl = packet_ioctl,
4437 .listen = sock_no_listen,
4438 .shutdown = sock_no_shutdown,
4439 .setsockopt = sock_no_setsockopt,
4440 .getsockopt = sock_no_getsockopt,
4441 .sendmsg = packet_sendmsg_spkt,
4442 .recvmsg = packet_recvmsg,
4443 .mmap = sock_no_mmap,
4444 .sendpage = sock_no_sendpage,
4447 static const struct proto_ops packet_ops = {
4448 .family = PF_PACKET,
4449 .owner = THIS_MODULE,
4450 .release = packet_release,
4451 .bind = packet_bind,
4452 .connect = sock_no_connect,
4453 .socketpair = sock_no_socketpair,
4454 .accept = sock_no_accept,
4455 .getname = packet_getname,
4456 .poll = packet_poll,
4457 .ioctl = packet_ioctl,
4458 .listen = sock_no_listen,
4459 .shutdown = sock_no_shutdown,
4460 .setsockopt = packet_setsockopt,
4461 .getsockopt = packet_getsockopt,
4462 #ifdef CONFIG_COMPAT
4463 .compat_setsockopt = compat_packet_setsockopt,
4465 .sendmsg = packet_sendmsg,
4466 .recvmsg = packet_recvmsg,
4467 .mmap = packet_mmap,
4468 .sendpage = sock_no_sendpage,
4471 static const struct net_proto_family packet_family_ops = {
4472 .family = PF_PACKET,
4473 .create = packet_create,
4474 .owner = THIS_MODULE,
4477 static struct notifier_block packet_netdev_notifier = {
4478 .notifier_call = packet_notifier,
4481 #ifdef CONFIG_PROC_FS
4483 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
4486 struct net *net = seq_file_net(seq);
4489 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
4492 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4494 struct net *net = seq_file_net(seq);
4495 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
4498 static void packet_seq_stop(struct seq_file *seq, void *v)
4504 static int packet_seq_show(struct seq_file *seq, void *v)
4506 if (v == SEQ_START_TOKEN)
4507 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4509 struct sock *s = sk_entry(v);
4510 const struct packet_sock *po = pkt_sk(s);
4513 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
4515 refcount_read(&s->sk_refcnt),
4520 atomic_read(&s->sk_rmem_alloc),
4521 from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)),
4528 static const struct seq_operations packet_seq_ops = {
4529 .start = packet_seq_start,
4530 .next = packet_seq_next,
4531 .stop = packet_seq_stop,
4532 .show = packet_seq_show,
4535 static int packet_seq_open(struct inode *inode, struct file *file)
4537 return seq_open_net(inode, file, &packet_seq_ops,
4538 sizeof(struct seq_net_private));
4541 static const struct file_operations packet_seq_fops = {
4542 .owner = THIS_MODULE,
4543 .open = packet_seq_open,
4545 .llseek = seq_lseek,
4546 .release = seq_release_net,
4551 static int __net_init packet_net_init(struct net *net)
4553 mutex_init(&net->packet.sklist_lock);
4554 INIT_HLIST_HEAD(&net->packet.sklist);
4556 if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops))
4562 static void __net_exit packet_net_exit(struct net *net)
4564 remove_proc_entry("packet", net->proc_net);
4567 static struct pernet_operations packet_net_ops = {
4568 .init = packet_net_init,
4569 .exit = packet_net_exit,
4573 static void __exit packet_exit(void)
4575 unregister_netdevice_notifier(&packet_netdev_notifier);
4576 unregister_pernet_subsys(&packet_net_ops);
4577 sock_unregister(PF_PACKET);
4578 proto_unregister(&packet_proto);
4581 static int __init packet_init(void)
4583 int rc = proto_register(&packet_proto, 0);
4588 sock_register(&packet_family_ops);
4589 register_pernet_subsys(&packet_net_ops);
4590 register_netdevice_notifier(&packet_netdev_notifier);
4595 module_init(packet_init);
4596 module_exit(packet_exit);
4597 MODULE_LICENSE("GPL");
4598 MODULE_ALIAS_NETPROTO(PF_PACKET);