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 PGV_FROM_VMALLOC 1
182 #define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status)
183 #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts)
184 #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt)
185 #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len)
186 #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num)
187 #define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
188 #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x)))
191 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
192 struct packet_type *pt, struct net_device *orig_dev);
194 static void *packet_previous_frame(struct packet_sock *po,
195 struct packet_ring_buffer *rb,
197 static void packet_increment_head(struct packet_ring_buffer *buff);
198 static int prb_curr_blk_in_use(struct tpacket_block_desc *);
199 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *,
200 struct packet_sock *);
201 static void prb_retire_current_block(struct tpacket_kbdq_core *,
202 struct packet_sock *, unsigned int status);
203 static int prb_queue_frozen(struct tpacket_kbdq_core *);
204 static void prb_open_block(struct tpacket_kbdq_core *,
205 struct tpacket_block_desc *);
206 static void prb_retire_rx_blk_timer_expired(unsigned long);
207 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *);
208 static void prb_init_blk_timer(struct packet_sock *,
209 struct tpacket_kbdq_core *,
210 void (*func) (unsigned long));
211 static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *);
212 static void prb_clear_rxhash(struct tpacket_kbdq_core *,
213 struct tpacket3_hdr *);
214 static void prb_fill_vlan_info(struct tpacket_kbdq_core *,
215 struct tpacket3_hdr *);
216 static void packet_flush_mclist(struct sock *sk);
218 struct packet_skb_cb {
220 struct sockaddr_pkt pkt;
222 /* Trick: alias skb original length with
223 * ll.sll_family and ll.protocol in order
226 unsigned int origlen;
227 struct sockaddr_ll ll;
232 #define vio_le() virtio_legacy_is_little_endian()
234 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
236 #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
237 #define GET_PBLOCK_DESC(x, bid) \
238 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
239 #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
240 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
241 #define GET_NEXT_PRB_BLK_NUM(x) \
242 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
243 ((x)->kactive_blk_num+1) : 0)
245 static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
246 static void __fanout_link(struct sock *sk, struct packet_sock *po);
248 static int packet_direct_xmit(struct sk_buff *skb)
250 struct net_device *dev = skb->dev;
251 struct sk_buff *orig_skb = skb;
252 struct netdev_queue *txq;
253 int ret = NETDEV_TX_BUSY;
255 if (unlikely(!netif_running(dev) ||
256 !netif_carrier_ok(dev)))
259 skb = validate_xmit_skb_list(skb, dev);
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);
1695 if (type == PACKET_FANOUT_ROLLOVER ||
1696 (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) {
1698 rollover = kzalloc(sizeof(*rollover), GFP_KERNEL);
1701 atomic_long_set(&rollover->num, 0);
1702 atomic_long_set(&rollover->num_huge, 0);
1703 atomic_long_set(&rollover->num_failed, 0);
1704 po->rollover = rollover;
1707 if (type_flags & PACKET_FANOUT_FLAG_UNIQUEID) {
1712 if (!fanout_find_new_id(sk, &id)) {
1716 /* ephemeral flag for the first socket in the group: drop it */
1717 flags &= ~(PACKET_FANOUT_FLAG_UNIQUEID >> 8);
1721 list_for_each_entry(f, &fanout_list, list) {
1723 read_pnet(&f->net) == sock_net(sk)) {
1729 if (match && match->flags != flags)
1733 match = kzalloc(sizeof(*match), GFP_KERNEL);
1736 write_pnet(&match->net, sock_net(sk));
1739 match->flags = flags;
1740 INIT_LIST_HEAD(&match->list);
1741 spin_lock_init(&match->lock);
1742 refcount_set(&match->sk_ref, 0);
1743 fanout_init_data(match);
1744 match->prot_hook.type = po->prot_hook.type;
1745 match->prot_hook.dev = po->prot_hook.dev;
1746 match->prot_hook.func = packet_rcv_fanout;
1747 match->prot_hook.af_packet_priv = match;
1748 match->prot_hook.id_match = match_fanout_group;
1749 list_add(&match->list, &fanout_list);
1752 if (match->type == type &&
1753 match->prot_hook.type == po->prot_hook.type &&
1754 match->prot_hook.dev == po->prot_hook.dev) {
1756 if (refcount_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
1757 __dev_remove_pack(&po->prot_hook);
1759 refcount_set(&match->sk_ref, refcount_read(&match->sk_ref) + 1);
1760 __fanout_link(sk, po);
1765 if (err && rollover) {
1767 po->rollover = NULL;
1769 mutex_unlock(&fanout_mutex);
1773 /* If pkt_sk(sk)->fanout->sk_ref is zero, this function removes
1774 * pkt_sk(sk)->fanout from fanout_list and returns pkt_sk(sk)->fanout.
1775 * It is the responsibility of the caller to call fanout_release_data() and
1776 * free the returned packet_fanout (after synchronize_net())
1778 static struct packet_fanout *fanout_release(struct sock *sk)
1780 struct packet_sock *po = pkt_sk(sk);
1781 struct packet_fanout *f;
1783 mutex_lock(&fanout_mutex);
1788 if (refcount_dec_and_test(&f->sk_ref))
1794 kfree_rcu(po->rollover, rcu);
1796 mutex_unlock(&fanout_mutex);
1801 static bool packet_extra_vlan_len_allowed(const struct net_device *dev,
1802 struct sk_buff *skb)
1804 /* Earlier code assumed this would be a VLAN pkt, double-check
1805 * this now that we have the actual packet in hand. We can only
1806 * do this check on Ethernet devices.
1808 if (unlikely(dev->type != ARPHRD_ETHER))
1811 skb_reset_mac_header(skb);
1812 return likely(eth_hdr(skb)->h_proto == htons(ETH_P_8021Q));
1815 static const struct proto_ops packet_ops;
1817 static const struct proto_ops packet_ops_spkt;
1819 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
1820 struct packet_type *pt, struct net_device *orig_dev)
1823 struct sockaddr_pkt *spkt;
1826 * When we registered the protocol we saved the socket in the data
1827 * field for just this event.
1830 sk = pt->af_packet_priv;
1833 * Yank back the headers [hope the device set this
1834 * right or kerboom...]
1836 * Incoming packets have ll header pulled,
1839 * For outgoing ones skb->data == skb_mac_header(skb)
1840 * so that this procedure is noop.
1843 if (skb->pkt_type == PACKET_LOOPBACK)
1846 if (!net_eq(dev_net(dev), sock_net(sk)))
1849 skb = skb_share_check(skb, GFP_ATOMIC);
1853 /* drop any routing info */
1856 /* drop conntrack reference */
1859 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
1861 skb_push(skb, skb->data - skb_mac_header(skb));
1864 * The SOCK_PACKET socket receives _all_ frames.
1867 spkt->spkt_family = dev->type;
1868 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
1869 spkt->spkt_protocol = skb->protocol;
1872 * Charge the memory to the socket. This is done specifically
1873 * to prevent sockets using all the memory up.
1876 if (sock_queue_rcv_skb(sk, skb) == 0)
1887 * Output a raw packet to a device layer. This bypasses all the other
1888 * protocol layers and you must therefore supply it with a complete frame
1891 static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg,
1894 struct sock *sk = sock->sk;
1895 DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name);
1896 struct sk_buff *skb = NULL;
1897 struct net_device *dev;
1898 struct sockcm_cookie sockc;
1904 * Get and verify the address.
1908 if (msg->msg_namelen < sizeof(struct sockaddr))
1910 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
1911 proto = saddr->spkt_protocol;
1913 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
1916 * Find the device first to size check it
1919 saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0;
1922 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
1928 if (!(dev->flags & IFF_UP))
1932 * You may not queue a frame bigger than the mtu. This is the lowest level
1933 * raw protocol and you must do your own fragmentation at this level.
1936 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
1937 if (!netif_supports_nofcs(dev)) {
1938 err = -EPROTONOSUPPORT;
1941 extra_len = 4; /* We're doing our own CRC */
1945 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len)
1949 size_t reserved = LL_RESERVED_SPACE(dev);
1950 int tlen = dev->needed_tailroom;
1951 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
1954 skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL);
1957 /* FIXME: Save some space for broken drivers that write a hard
1958 * header at transmission time by themselves. PPP is the notable
1959 * one here. This should really be fixed at the driver level.
1961 skb_reserve(skb, reserved);
1962 skb_reset_network_header(skb);
1964 /* Try to align data part correctly */
1969 skb_reset_network_header(skb);
1971 err = memcpy_from_msg(skb_put(skb, len), msg, len);
1977 if (!dev_validate_header(dev, skb->data, len)) {
1981 if (len > (dev->mtu + dev->hard_header_len + extra_len) &&
1982 !packet_extra_vlan_len_allowed(dev, skb)) {
1987 sockc.tsflags = sk->sk_tsflags;
1988 if (msg->msg_controllen) {
1989 err = sock_cmsg_send(sk, msg, &sockc);
1994 skb->protocol = proto;
1996 skb->priority = sk->sk_priority;
1997 skb->mark = sk->sk_mark;
1999 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
2001 if (unlikely(extra_len == 4))
2004 skb_probe_transport_header(skb, 0);
2006 dev_queue_xmit(skb);
2017 static unsigned int run_filter(struct sk_buff *skb,
2018 const struct sock *sk,
2021 struct sk_filter *filter;
2024 filter = rcu_dereference(sk->sk_filter);
2026 res = bpf_prog_run_clear_cb(filter->prog, skb);
2032 static int packet_rcv_vnet(struct msghdr *msg, const struct sk_buff *skb,
2035 struct virtio_net_hdr vnet_hdr;
2037 if (*len < sizeof(vnet_hdr))
2039 *len -= sizeof(vnet_hdr);
2041 if (virtio_net_hdr_from_skb(skb, &vnet_hdr, vio_le(), true))
2044 return memcpy_to_msg(msg, (void *)&vnet_hdr, sizeof(vnet_hdr));
2048 * This function makes lazy skb cloning in hope that most of packets
2049 * are discarded by BPF.
2051 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
2052 * and skb->cb are mangled. It works because (and until) packets
2053 * falling here are owned by current CPU. Output packets are cloned
2054 * by dev_queue_xmit_nit(), input packets are processed by net_bh
2055 * sequencially, so that if we return skb to original state on exit,
2056 * we will not harm anyone.
2059 static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
2060 struct packet_type *pt, struct net_device *orig_dev)
2063 struct sockaddr_ll *sll;
2064 struct packet_sock *po;
2065 u8 *skb_head = skb->data;
2066 int skb_len = skb->len;
2067 unsigned int snaplen, res;
2068 bool is_drop_n_account = false;
2070 if (skb->pkt_type == PACKET_LOOPBACK)
2073 sk = pt->af_packet_priv;
2076 if (!net_eq(dev_net(dev), sock_net(sk)))
2081 if (dev->header_ops) {
2082 /* The device has an explicit notion of ll header,
2083 * exported to higher levels.
2085 * Otherwise, the device hides details of its frame
2086 * structure, so that corresponding packet head is
2087 * never delivered to user.
2089 if (sk->sk_type != SOCK_DGRAM)
2090 skb_push(skb, skb->data - skb_mac_header(skb));
2091 else if (skb->pkt_type == PACKET_OUTGOING) {
2092 /* Special case: outgoing packets have ll header at head */
2093 skb_pull(skb, skb_network_offset(skb));
2099 res = run_filter(skb, sk, snaplen);
2101 goto drop_n_restore;
2105 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
2108 if (skb_shared(skb)) {
2109 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
2113 if (skb_head != skb->data) {
2114 skb->data = skb_head;
2121 sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8);
2123 sll = &PACKET_SKB_CB(skb)->sa.ll;
2124 sll->sll_hatype = dev->type;
2125 sll->sll_pkttype = skb->pkt_type;
2126 if (unlikely(po->origdev))
2127 sll->sll_ifindex = orig_dev->ifindex;
2129 sll->sll_ifindex = dev->ifindex;
2131 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2133 /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg().
2134 * Use their space for storing the original skb length.
2136 PACKET_SKB_CB(skb)->sa.origlen = skb->len;
2138 if (pskb_trim(skb, snaplen))
2141 skb_set_owner_r(skb, sk);
2145 /* drop conntrack reference */
2148 spin_lock(&sk->sk_receive_queue.lock);
2149 po->stats.stats1.tp_packets++;
2150 sock_skb_set_dropcount(sk, skb);
2151 __skb_queue_tail(&sk->sk_receive_queue, skb);
2152 spin_unlock(&sk->sk_receive_queue.lock);
2153 sk->sk_data_ready(sk);
2157 is_drop_n_account = true;
2158 spin_lock(&sk->sk_receive_queue.lock);
2159 po->stats.stats1.tp_drops++;
2160 atomic_inc(&sk->sk_drops);
2161 spin_unlock(&sk->sk_receive_queue.lock);
2164 if (skb_head != skb->data && skb_shared(skb)) {
2165 skb->data = skb_head;
2169 if (!is_drop_n_account)
2176 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
2177 struct packet_type *pt, struct net_device *orig_dev)
2180 struct packet_sock *po;
2181 struct sockaddr_ll *sll;
2182 union tpacket_uhdr h;
2183 u8 *skb_head = skb->data;
2184 int skb_len = skb->len;
2185 unsigned int snaplen, res;
2186 unsigned long status = TP_STATUS_USER;
2187 unsigned short macoff, netoff, hdrlen;
2188 struct sk_buff *copy_skb = NULL;
2191 bool is_drop_n_account = false;
2193 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
2194 * We may add members to them until current aligned size without forcing
2195 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
2197 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
2198 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
2200 if (skb->pkt_type == PACKET_LOOPBACK)
2203 sk = pt->af_packet_priv;
2206 if (!net_eq(dev_net(dev), sock_net(sk)))
2209 if (dev->header_ops) {
2210 if (sk->sk_type != SOCK_DGRAM)
2211 skb_push(skb, skb->data - skb_mac_header(skb));
2212 else if (skb->pkt_type == PACKET_OUTGOING) {
2213 /* Special case: outgoing packets have ll header at head */
2214 skb_pull(skb, skb_network_offset(skb));
2220 res = run_filter(skb, sk, snaplen);
2222 goto drop_n_restore;
2224 if (skb->ip_summed == CHECKSUM_PARTIAL)
2225 status |= TP_STATUS_CSUMNOTREADY;
2226 else if (skb->pkt_type != PACKET_OUTGOING &&
2227 (skb->ip_summed == CHECKSUM_COMPLETE ||
2228 skb_csum_unnecessary(skb)))
2229 status |= TP_STATUS_CSUM_VALID;
2234 if (sk->sk_type == SOCK_DGRAM) {
2235 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
2238 unsigned int maclen = skb_network_offset(skb);
2239 netoff = TPACKET_ALIGN(po->tp_hdrlen +
2240 (maclen < 16 ? 16 : maclen)) +
2242 if (po->has_vnet_hdr)
2243 netoff += sizeof(struct virtio_net_hdr);
2244 macoff = netoff - maclen;
2246 if (po->tp_version <= TPACKET_V2) {
2247 if (macoff + snaplen > po->rx_ring.frame_size) {
2248 if (po->copy_thresh &&
2249 atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
2250 if (skb_shared(skb)) {
2251 copy_skb = skb_clone(skb, GFP_ATOMIC);
2253 copy_skb = skb_get(skb);
2254 skb_head = skb->data;
2257 skb_set_owner_r(copy_skb, sk);
2259 snaplen = po->rx_ring.frame_size - macoff;
2260 if ((int)snaplen < 0)
2263 } else if (unlikely(macoff + snaplen >
2264 GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) {
2267 nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff;
2268 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
2269 snaplen, nval, macoff);
2271 if (unlikely((int)snaplen < 0)) {
2273 macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len;
2276 spin_lock(&sk->sk_receive_queue.lock);
2277 h.raw = packet_current_rx_frame(po, skb,
2278 TP_STATUS_KERNEL, (macoff+snaplen));
2280 goto drop_n_account;
2281 if (po->tp_version <= TPACKET_V2) {
2282 packet_increment_rx_head(po, &po->rx_ring);
2284 * LOSING will be reported till you read the stats,
2285 * because it's COR - Clear On Read.
2286 * Anyways, moving it for V1/V2 only as V3 doesn't need this
2289 if (po->stats.stats1.tp_drops)
2290 status |= TP_STATUS_LOSING;
2292 po->stats.stats1.tp_packets++;
2294 status |= TP_STATUS_COPY;
2295 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
2297 spin_unlock(&sk->sk_receive_queue.lock);
2299 if (po->has_vnet_hdr) {
2300 if (virtio_net_hdr_from_skb(skb, h.raw + macoff -
2301 sizeof(struct virtio_net_hdr),
2303 spin_lock(&sk->sk_receive_queue.lock);
2304 goto drop_n_account;
2308 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
2310 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
2311 getnstimeofday(&ts);
2313 status |= ts_status;
2315 switch (po->tp_version) {
2317 h.h1->tp_len = skb->len;
2318 h.h1->tp_snaplen = snaplen;
2319 h.h1->tp_mac = macoff;
2320 h.h1->tp_net = netoff;
2321 h.h1->tp_sec = ts.tv_sec;
2322 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
2323 hdrlen = sizeof(*h.h1);
2326 h.h2->tp_len = skb->len;
2327 h.h2->tp_snaplen = snaplen;
2328 h.h2->tp_mac = macoff;
2329 h.h2->tp_net = netoff;
2330 h.h2->tp_sec = ts.tv_sec;
2331 h.h2->tp_nsec = ts.tv_nsec;
2332 if (skb_vlan_tag_present(skb)) {
2333 h.h2->tp_vlan_tci = skb_vlan_tag_get(skb);
2334 h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto);
2335 status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
2337 h.h2->tp_vlan_tci = 0;
2338 h.h2->tp_vlan_tpid = 0;
2340 memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding));
2341 hdrlen = sizeof(*h.h2);
2344 /* tp_nxt_offset,vlan are already populated above.
2345 * So DONT clear those fields here
2347 h.h3->tp_status |= status;
2348 h.h3->tp_len = skb->len;
2349 h.h3->tp_snaplen = snaplen;
2350 h.h3->tp_mac = macoff;
2351 h.h3->tp_net = netoff;
2352 h.h3->tp_sec = ts.tv_sec;
2353 h.h3->tp_nsec = ts.tv_nsec;
2354 memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding));
2355 hdrlen = sizeof(*h.h3);
2361 sll = h.raw + TPACKET_ALIGN(hdrlen);
2362 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2363 sll->sll_family = AF_PACKET;
2364 sll->sll_hatype = dev->type;
2365 sll->sll_protocol = skb->protocol;
2366 sll->sll_pkttype = skb->pkt_type;
2367 if (unlikely(po->origdev))
2368 sll->sll_ifindex = orig_dev->ifindex;
2370 sll->sll_ifindex = dev->ifindex;
2374 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
2375 if (po->tp_version <= TPACKET_V2) {
2378 end = (u8 *) PAGE_ALIGN((unsigned long) h.raw +
2381 for (start = h.raw; start < end; start += PAGE_SIZE)
2382 flush_dcache_page(pgv_to_page(start));
2387 if (po->tp_version <= TPACKET_V2) {
2388 __packet_set_status(po, h.raw, status);
2389 sk->sk_data_ready(sk);
2391 prb_clear_blk_fill_status(&po->rx_ring);
2395 if (skb_head != skb->data && skb_shared(skb)) {
2396 skb->data = skb_head;
2400 if (!is_drop_n_account)
2407 is_drop_n_account = true;
2408 po->stats.stats1.tp_drops++;
2409 spin_unlock(&sk->sk_receive_queue.lock);
2411 sk->sk_data_ready(sk);
2412 kfree_skb(copy_skb);
2413 goto drop_n_restore;
2416 static void tpacket_destruct_skb(struct sk_buff *skb)
2418 struct packet_sock *po = pkt_sk(skb->sk);
2420 if (likely(po->tx_ring.pg_vec)) {
2424 ph = skb_shinfo(skb)->destructor_arg;
2425 packet_dec_pending(&po->tx_ring);
2427 ts = __packet_set_timestamp(po, ph, skb);
2428 __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts);
2434 static void tpacket_set_protocol(const struct net_device *dev,
2435 struct sk_buff *skb)
2437 if (dev->type == ARPHRD_ETHER) {
2438 skb_reset_mac_header(skb);
2439 skb->protocol = eth_hdr(skb)->h_proto;
2443 static int __packet_snd_vnet_parse(struct virtio_net_hdr *vnet_hdr, size_t len)
2445 if ((vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
2446 (__virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2447 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2 >
2448 __virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len)))
2449 vnet_hdr->hdr_len = __cpu_to_virtio16(vio_le(),
2450 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2451 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2);
2453 if (__virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len) > len)
2459 static int packet_snd_vnet_parse(struct msghdr *msg, size_t *len,
2460 struct virtio_net_hdr *vnet_hdr)
2462 if (*len < sizeof(*vnet_hdr))
2464 *len -= sizeof(*vnet_hdr);
2466 if (!copy_from_iter_full(vnet_hdr, sizeof(*vnet_hdr), &msg->msg_iter))
2469 return __packet_snd_vnet_parse(vnet_hdr, *len);
2472 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
2473 void *frame, struct net_device *dev, void *data, int tp_len,
2474 __be16 proto, unsigned char *addr, int hlen, int copylen,
2475 const struct sockcm_cookie *sockc)
2477 union tpacket_uhdr ph;
2478 int to_write, offset, len, nr_frags, len_max;
2479 struct socket *sock = po->sk.sk_socket;
2485 skb->protocol = proto;
2487 skb->priority = po->sk.sk_priority;
2488 skb->mark = po->sk.sk_mark;
2489 sock_tx_timestamp(&po->sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags);
2490 skb_shinfo(skb)->destructor_arg = ph.raw;
2492 skb_reserve(skb, hlen);
2493 skb_reset_network_header(skb);
2497 if (sock->type == SOCK_DGRAM) {
2498 err = dev_hard_header(skb, dev, ntohs(proto), addr,
2500 if (unlikely(err < 0))
2502 } else if (copylen) {
2503 int hdrlen = min_t(int, copylen, tp_len);
2505 skb_push(skb, dev->hard_header_len);
2506 skb_put(skb, copylen - dev->hard_header_len);
2507 err = skb_store_bits(skb, 0, data, hdrlen);
2510 if (!dev_validate_header(dev, skb->data, hdrlen))
2513 tpacket_set_protocol(dev, skb);
2519 offset = offset_in_page(data);
2520 len_max = PAGE_SIZE - offset;
2521 len = ((to_write > len_max) ? len_max : to_write);
2523 skb->data_len = to_write;
2524 skb->len += to_write;
2525 skb->truesize += to_write;
2526 refcount_add(to_write, &po->sk.sk_wmem_alloc);
2528 while (likely(to_write)) {
2529 nr_frags = skb_shinfo(skb)->nr_frags;
2531 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
2532 pr_err("Packet exceed the number of skb frags(%lu)\n",
2537 page = pgv_to_page(data);
2539 flush_dcache_page(page);
2541 skb_fill_page_desc(skb, nr_frags, page, offset, len);
2544 len_max = PAGE_SIZE;
2545 len = ((to_write > len_max) ? len_max : to_write);
2548 skb_probe_transport_header(skb, 0);
2553 static int tpacket_parse_header(struct packet_sock *po, void *frame,
2554 int size_max, void **data)
2556 union tpacket_uhdr ph;
2561 switch (po->tp_version) {
2563 if (ph.h3->tp_next_offset != 0) {
2564 pr_warn_once("variable sized slot not supported");
2567 tp_len = ph.h3->tp_len;
2570 tp_len = ph.h2->tp_len;
2573 tp_len = ph.h1->tp_len;
2576 if (unlikely(tp_len > size_max)) {
2577 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
2581 if (unlikely(po->tp_tx_has_off)) {
2582 int off_min, off_max;
2584 off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2585 off_max = po->tx_ring.frame_size - tp_len;
2586 if (po->sk.sk_type == SOCK_DGRAM) {
2587 switch (po->tp_version) {
2589 off = ph.h3->tp_net;
2592 off = ph.h2->tp_net;
2595 off = ph.h1->tp_net;
2599 switch (po->tp_version) {
2601 off = ph.h3->tp_mac;
2604 off = ph.h2->tp_mac;
2607 off = ph.h1->tp_mac;
2611 if (unlikely((off < off_min) || (off_max < off)))
2614 off = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2617 *data = frame + off;
2621 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
2623 struct sk_buff *skb;
2624 struct net_device *dev;
2625 struct virtio_net_hdr *vnet_hdr = NULL;
2626 struct sockcm_cookie sockc;
2628 int err, reserve = 0;
2630 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2631 bool need_wait = !(msg->msg_flags & MSG_DONTWAIT);
2632 int tp_len, size_max;
2633 unsigned char *addr;
2636 int status = TP_STATUS_AVAILABLE;
2637 int hlen, tlen, copylen = 0;
2639 mutex_lock(&po->pg_vec_lock);
2641 if (likely(saddr == NULL)) {
2642 dev = packet_cached_dev_get(po);
2647 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2649 if (msg->msg_namelen < (saddr->sll_halen
2650 + offsetof(struct sockaddr_ll,
2653 proto = saddr->sll_protocol;
2654 addr = saddr->sll_addr;
2655 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
2659 if (unlikely(dev == NULL))
2662 if (unlikely(!(dev->flags & IFF_UP)))
2665 sockc.tsflags = po->sk.sk_tsflags;
2666 if (msg->msg_controllen) {
2667 err = sock_cmsg_send(&po->sk, msg, &sockc);
2672 if (po->sk.sk_socket->type == SOCK_RAW)
2673 reserve = dev->hard_header_len;
2674 size_max = po->tx_ring.frame_size
2675 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
2677 if ((size_max > dev->mtu + reserve + VLAN_HLEN) && !po->has_vnet_hdr)
2678 size_max = dev->mtu + reserve + VLAN_HLEN;
2681 ph = packet_current_frame(po, &po->tx_ring,
2682 TP_STATUS_SEND_REQUEST);
2683 if (unlikely(ph == NULL)) {
2684 if (need_wait && need_resched())
2690 tp_len = tpacket_parse_header(po, ph, size_max, &data);
2694 status = TP_STATUS_SEND_REQUEST;
2695 hlen = LL_RESERVED_SPACE(dev);
2696 tlen = dev->needed_tailroom;
2697 if (po->has_vnet_hdr) {
2699 data += sizeof(*vnet_hdr);
2700 tp_len -= sizeof(*vnet_hdr);
2702 __packet_snd_vnet_parse(vnet_hdr, tp_len)) {
2706 copylen = __virtio16_to_cpu(vio_le(),
2709 copylen = max_t(int, copylen, dev->hard_header_len);
2710 skb = sock_alloc_send_skb(&po->sk,
2711 hlen + tlen + sizeof(struct sockaddr_ll) +
2712 (copylen - dev->hard_header_len),
2715 if (unlikely(skb == NULL)) {
2716 /* we assume the socket was initially writeable ... */
2717 if (likely(len_sum > 0))
2721 tp_len = tpacket_fill_skb(po, skb, ph, dev, data, tp_len, proto,
2722 addr, hlen, copylen, &sockc);
2723 if (likely(tp_len >= 0) &&
2724 tp_len > dev->mtu + reserve &&
2725 !po->has_vnet_hdr &&
2726 !packet_extra_vlan_len_allowed(dev, skb))
2729 if (unlikely(tp_len < 0)) {
2732 __packet_set_status(po, ph,
2733 TP_STATUS_AVAILABLE);
2734 packet_increment_head(&po->tx_ring);
2738 status = TP_STATUS_WRONG_FORMAT;
2744 if (po->has_vnet_hdr && virtio_net_hdr_to_skb(skb, vnet_hdr,
2750 packet_pick_tx_queue(dev, skb);
2752 skb->destructor = tpacket_destruct_skb;
2753 __packet_set_status(po, ph, TP_STATUS_SENDING);
2754 packet_inc_pending(&po->tx_ring);
2756 status = TP_STATUS_SEND_REQUEST;
2757 err = po->xmit(skb);
2758 if (unlikely(err > 0)) {
2759 err = net_xmit_errno(err);
2760 if (err && __packet_get_status(po, ph) ==
2761 TP_STATUS_AVAILABLE) {
2762 /* skb was destructed already */
2767 * skb was dropped but not destructed yet;
2768 * let's treat it like congestion or err < 0
2772 packet_increment_head(&po->tx_ring);
2774 } while (likely((ph != NULL) ||
2775 /* Note: packet_read_pending() might be slow if we have
2776 * to call it as it's per_cpu variable, but in fast-path
2777 * we already short-circuit the loop with the first
2778 * condition, and luckily don't have to go that path
2781 (need_wait && packet_read_pending(&po->tx_ring))));
2787 __packet_set_status(po, ph, status);
2792 mutex_unlock(&po->pg_vec_lock);
2796 static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
2797 size_t reserve, size_t len,
2798 size_t linear, int noblock,
2801 struct sk_buff *skb;
2803 /* Under a page? Don't bother with paged skb. */
2804 if (prepad + len < PAGE_SIZE || !linear)
2807 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
2812 skb_reserve(skb, reserve);
2813 skb_put(skb, linear);
2814 skb->data_len = len - linear;
2815 skb->len += len - linear;
2820 static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
2822 struct sock *sk = sock->sk;
2823 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2824 struct sk_buff *skb;
2825 struct net_device *dev;
2827 unsigned char *addr;
2828 int err, reserve = 0;
2829 struct sockcm_cookie sockc;
2830 struct virtio_net_hdr vnet_hdr = { 0 };
2832 struct packet_sock *po = pkt_sk(sk);
2833 int hlen, tlen, linear;
2837 * Get and verify the address.
2840 if (likely(saddr == NULL)) {
2841 dev = packet_cached_dev_get(po);
2846 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2848 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
2850 proto = saddr->sll_protocol;
2851 addr = saddr->sll_addr;
2852 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
2856 if (unlikely(dev == NULL))
2859 if (unlikely(!(dev->flags & IFF_UP)))
2862 sockc.tsflags = sk->sk_tsflags;
2863 sockc.mark = sk->sk_mark;
2864 if (msg->msg_controllen) {
2865 err = sock_cmsg_send(sk, msg, &sockc);
2870 if (sock->type == SOCK_RAW)
2871 reserve = dev->hard_header_len;
2872 if (po->has_vnet_hdr) {
2873 err = packet_snd_vnet_parse(msg, &len, &vnet_hdr);
2878 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
2879 if (!netif_supports_nofcs(dev)) {
2880 err = -EPROTONOSUPPORT;
2883 extra_len = 4; /* We're doing our own CRC */
2887 if (!vnet_hdr.gso_type &&
2888 (len > dev->mtu + reserve + VLAN_HLEN + extra_len))
2892 hlen = LL_RESERVED_SPACE(dev);
2893 tlen = dev->needed_tailroom;
2894 linear = __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len);
2895 linear = max(linear, min_t(int, len, dev->hard_header_len));
2896 skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, linear,
2897 msg->msg_flags & MSG_DONTWAIT, &err);
2901 skb_set_network_header(skb, reserve);
2904 if (sock->type == SOCK_DGRAM) {
2905 offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len);
2906 if (unlikely(offset < 0))
2910 /* Returns -EFAULT on error */
2911 err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len);
2915 if (sock->type == SOCK_RAW &&
2916 !dev_validate_header(dev, skb->data, len)) {
2921 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
2923 if (!vnet_hdr.gso_type && (len > dev->mtu + reserve + extra_len) &&
2924 !packet_extra_vlan_len_allowed(dev, skb)) {
2929 skb->protocol = proto;
2931 skb->priority = sk->sk_priority;
2932 skb->mark = sockc.mark;
2934 packet_pick_tx_queue(dev, skb);
2936 if (po->has_vnet_hdr) {
2937 err = virtio_net_hdr_to_skb(skb, &vnet_hdr, vio_le());
2940 len += sizeof(vnet_hdr);
2943 skb_probe_transport_header(skb, reserve);
2945 if (unlikely(extra_len == 4))
2948 err = po->xmit(skb);
2949 if (err > 0 && (err = net_xmit_errno(err)) != 0)
2965 static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2967 struct sock *sk = sock->sk;
2968 struct packet_sock *po = pkt_sk(sk);
2970 if (po->tx_ring.pg_vec)
2971 return tpacket_snd(po, msg);
2973 return packet_snd(sock, msg, len);
2977 * Close a PACKET socket. This is fairly simple. We immediately go
2978 * to 'closed' state and remove our protocol entry in the device list.
2981 static int packet_release(struct socket *sock)
2983 struct sock *sk = sock->sk;
2984 struct packet_sock *po;
2985 struct packet_fanout *f;
2987 union tpacket_req_u req_u;
2995 mutex_lock(&net->packet.sklist_lock);
2996 sk_del_node_init_rcu(sk);
2997 mutex_unlock(&net->packet.sklist_lock);
3000 sock_prot_inuse_add(net, sk->sk_prot, -1);
3003 spin_lock(&po->bind_lock);
3004 unregister_prot_hook(sk, false);
3005 packet_cached_dev_reset(po);
3007 if (po->prot_hook.dev) {
3008 dev_put(po->prot_hook.dev);
3009 po->prot_hook.dev = NULL;
3011 spin_unlock(&po->bind_lock);
3013 packet_flush_mclist(sk);
3015 if (po->rx_ring.pg_vec) {
3016 memset(&req_u, 0, sizeof(req_u));
3017 packet_set_ring(sk, &req_u, 1, 0);
3020 if (po->tx_ring.pg_vec) {
3021 memset(&req_u, 0, sizeof(req_u));
3022 packet_set_ring(sk, &req_u, 1, 1);
3025 f = fanout_release(sk);
3030 fanout_release_data(f);
3034 * Now the socket is dead. No more input will appear.
3041 skb_queue_purge(&sk->sk_receive_queue);
3042 packet_free_pending(po);
3043 sk_refcnt_debug_release(sk);
3050 * Attach a packet hook.
3053 static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
3056 struct packet_sock *po = pkt_sk(sk);
3057 struct net_device *dev_curr;
3060 struct net_device *dev = NULL;
3062 bool unlisted = false;
3068 spin_lock(&po->bind_lock);
3072 dev = dev_get_by_name_rcu(sock_net(sk), name);
3077 } else if (ifindex) {
3078 dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
3088 proto_curr = po->prot_hook.type;
3089 dev_curr = po->prot_hook.dev;
3091 need_rehook = proto_curr != proto || dev_curr != dev;
3096 __unregister_prot_hook(sk, true);
3098 dev_curr = po->prot_hook.dev;
3100 unlisted = !dev_get_by_index_rcu(sock_net(sk),
3105 po->prot_hook.type = proto;
3107 if (unlikely(unlisted)) {
3109 po->prot_hook.dev = NULL;
3111 packet_cached_dev_reset(po);
3113 po->prot_hook.dev = dev;
3114 po->ifindex = dev ? dev->ifindex : 0;
3115 packet_cached_dev_assign(po, dev);
3121 if (proto == 0 || !need_rehook)
3124 if (!unlisted && (!dev || (dev->flags & IFF_UP))) {
3125 register_prot_hook(sk);
3127 sk->sk_err = ENETDOWN;
3128 if (!sock_flag(sk, SOCK_DEAD))
3129 sk->sk_error_report(sk);
3134 spin_unlock(&po->bind_lock);
3140 * Bind a packet socket to a device
3143 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
3146 struct sock *sk = sock->sk;
3147 char name[sizeof(uaddr->sa_data) + 1];
3153 if (addr_len != sizeof(struct sockaddr))
3155 /* uaddr->sa_data comes from the userspace, it's not guaranteed to be
3158 memcpy(name, uaddr->sa_data, sizeof(uaddr->sa_data));
3159 name[sizeof(uaddr->sa_data)] = 0;
3161 return packet_do_bind(sk, name, 0, pkt_sk(sk)->num);
3164 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
3166 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
3167 struct sock *sk = sock->sk;
3173 if (addr_len < sizeof(struct sockaddr_ll))
3175 if (sll->sll_family != AF_PACKET)
3178 return packet_do_bind(sk, NULL, sll->sll_ifindex,
3179 sll->sll_protocol ? : pkt_sk(sk)->num);
3182 static struct proto packet_proto = {
3184 .owner = THIS_MODULE,
3185 .obj_size = sizeof(struct packet_sock),
3189 * Create a packet of type SOCK_PACKET.
3192 static int packet_create(struct net *net, struct socket *sock, int protocol,
3196 struct packet_sock *po;
3197 __be16 proto = (__force __be16)protocol; /* weird, but documented */
3200 if (!ns_capable(net->user_ns, CAP_NET_RAW))
3202 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
3203 sock->type != SOCK_PACKET)
3204 return -ESOCKTNOSUPPORT;
3206 sock->state = SS_UNCONNECTED;
3209 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto, kern);
3213 sock->ops = &packet_ops;
3214 if (sock->type == SOCK_PACKET)
3215 sock->ops = &packet_ops_spkt;
3217 sock_init_data(sock, sk);
3220 sk->sk_family = PF_PACKET;
3222 po->xmit = dev_queue_xmit;
3224 err = packet_alloc_pending(po);
3228 packet_cached_dev_reset(po);
3230 sk->sk_destruct = packet_sock_destruct;
3231 sk_refcnt_debug_inc(sk);
3234 * Attach a protocol block
3237 spin_lock_init(&po->bind_lock);
3238 mutex_init(&po->pg_vec_lock);
3239 po->rollover = NULL;
3240 po->prot_hook.func = packet_rcv;
3242 if (sock->type == SOCK_PACKET)
3243 po->prot_hook.func = packet_rcv_spkt;
3245 po->prot_hook.af_packet_priv = sk;
3248 po->prot_hook.type = proto;
3249 register_prot_hook(sk);
3252 mutex_lock(&net->packet.sklist_lock);
3253 sk_add_node_rcu(sk, &net->packet.sklist);
3254 mutex_unlock(&net->packet.sklist_lock);
3257 sock_prot_inuse_add(net, &packet_proto, 1);
3268 * Pull a packet from our receive queue and hand it to the user.
3269 * If necessary we block.
3272 static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3275 struct sock *sk = sock->sk;
3276 struct sk_buff *skb;
3278 int vnet_hdr_len = 0;
3279 unsigned int origlen = 0;
3282 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
3286 /* What error should we return now? EUNATTACH? */
3287 if (pkt_sk(sk)->ifindex < 0)
3291 if (flags & MSG_ERRQUEUE) {
3292 err = sock_recv_errqueue(sk, msg, len,
3293 SOL_PACKET, PACKET_TX_TIMESTAMP);
3298 * Call the generic datagram receiver. This handles all sorts
3299 * of horrible races and re-entrancy so we can forget about it
3300 * in the protocol layers.
3302 * Now it will return ENETDOWN, if device have just gone down,
3303 * but then it will block.
3306 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3309 * An error occurred so return it. Because skb_recv_datagram()
3310 * handles the blocking we don't see and worry about blocking
3317 if (pkt_sk(sk)->pressure)
3318 packet_rcv_has_room(pkt_sk(sk), NULL);
3320 if (pkt_sk(sk)->has_vnet_hdr) {
3321 err = packet_rcv_vnet(msg, skb, &len);
3324 vnet_hdr_len = sizeof(struct virtio_net_hdr);
3327 /* You lose any data beyond the buffer you gave. If it worries
3328 * a user program they can ask the device for its MTU
3334 msg->msg_flags |= MSG_TRUNC;
3337 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3341 if (sock->type != SOCK_PACKET) {
3342 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3344 /* Original length was stored in sockaddr_ll fields */
3345 origlen = PACKET_SKB_CB(skb)->sa.origlen;
3346 sll->sll_family = AF_PACKET;
3347 sll->sll_protocol = skb->protocol;
3350 sock_recv_ts_and_drops(msg, sk, skb);
3352 if (msg->msg_name) {
3353 /* If the address length field is there to be filled
3354 * in, we fill it in now.
3356 if (sock->type == SOCK_PACKET) {
3357 __sockaddr_check_size(sizeof(struct sockaddr_pkt));
3358 msg->msg_namelen = sizeof(struct sockaddr_pkt);
3360 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3362 msg->msg_namelen = sll->sll_halen +
3363 offsetof(struct sockaddr_ll, sll_addr);
3365 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
3369 if (pkt_sk(sk)->auxdata) {
3370 struct tpacket_auxdata aux;
3372 aux.tp_status = TP_STATUS_USER;
3373 if (skb->ip_summed == CHECKSUM_PARTIAL)
3374 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
3375 else if (skb->pkt_type != PACKET_OUTGOING &&
3376 (skb->ip_summed == CHECKSUM_COMPLETE ||
3377 skb_csum_unnecessary(skb)))
3378 aux.tp_status |= TP_STATUS_CSUM_VALID;
3380 aux.tp_len = origlen;
3381 aux.tp_snaplen = skb->len;
3383 aux.tp_net = skb_network_offset(skb);
3384 if (skb_vlan_tag_present(skb)) {
3385 aux.tp_vlan_tci = skb_vlan_tag_get(skb);
3386 aux.tp_vlan_tpid = ntohs(skb->vlan_proto);
3387 aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
3389 aux.tp_vlan_tci = 0;
3390 aux.tp_vlan_tpid = 0;
3392 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
3396 * Free or return the buffer as appropriate. Again this
3397 * hides all the races and re-entrancy issues from us.
3399 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
3402 skb_free_datagram(sk, skb);
3407 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
3408 int *uaddr_len, int peer)
3410 struct net_device *dev;
3411 struct sock *sk = sock->sk;
3416 uaddr->sa_family = AF_PACKET;
3417 memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
3419 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
3421 strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
3423 *uaddr_len = sizeof(*uaddr);
3428 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
3429 int *uaddr_len, int peer)
3431 struct net_device *dev;
3432 struct sock *sk = sock->sk;
3433 struct packet_sock *po = pkt_sk(sk);
3434 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
3439 sll->sll_family = AF_PACKET;
3440 sll->sll_ifindex = po->ifindex;
3441 sll->sll_protocol = po->num;
3442 sll->sll_pkttype = 0;
3444 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
3446 sll->sll_hatype = dev->type;
3447 sll->sll_halen = dev->addr_len;
3448 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
3450 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
3454 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
3459 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
3463 case PACKET_MR_MULTICAST:
3464 if (i->alen != dev->addr_len)
3467 return dev_mc_add(dev, i->addr);
3469 return dev_mc_del(dev, i->addr);
3471 case PACKET_MR_PROMISC:
3472 return dev_set_promiscuity(dev, what);
3473 case PACKET_MR_ALLMULTI:
3474 return dev_set_allmulti(dev, what);
3475 case PACKET_MR_UNICAST:
3476 if (i->alen != dev->addr_len)
3479 return dev_uc_add(dev, i->addr);
3481 return dev_uc_del(dev, i->addr);
3489 static void packet_dev_mclist_delete(struct net_device *dev,
3490 struct packet_mclist **mlp)
3492 struct packet_mclist *ml;
3494 while ((ml = *mlp) != NULL) {
3495 if (ml->ifindex == dev->ifindex) {
3496 packet_dev_mc(dev, ml, -1);
3504 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
3506 struct packet_sock *po = pkt_sk(sk);
3507 struct packet_mclist *ml, *i;
3508 struct net_device *dev;
3514 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
3519 if (mreq->mr_alen > dev->addr_len)
3523 i = kmalloc(sizeof(*i), GFP_KERNEL);
3528 for (ml = po->mclist; ml; ml = ml->next) {
3529 if (ml->ifindex == mreq->mr_ifindex &&
3530 ml->type == mreq->mr_type &&
3531 ml->alen == mreq->mr_alen &&
3532 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3534 /* Free the new element ... */
3540 i->type = mreq->mr_type;
3541 i->ifindex = mreq->mr_ifindex;
3542 i->alen = mreq->mr_alen;
3543 memcpy(i->addr, mreq->mr_address, i->alen);
3544 memset(i->addr + i->alen, 0, sizeof(i->addr) - i->alen);
3546 i->next = po->mclist;
3548 err = packet_dev_mc(dev, i, 1);
3550 po->mclist = i->next;
3559 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
3561 struct packet_mclist *ml, **mlp;
3565 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
3566 if (ml->ifindex == mreq->mr_ifindex &&
3567 ml->type == mreq->mr_type &&
3568 ml->alen == mreq->mr_alen &&
3569 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3570 if (--ml->count == 0) {
3571 struct net_device *dev;
3573 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3575 packet_dev_mc(dev, ml, -1);
3585 static void packet_flush_mclist(struct sock *sk)
3587 struct packet_sock *po = pkt_sk(sk);
3588 struct packet_mclist *ml;
3594 while ((ml = po->mclist) != NULL) {
3595 struct net_device *dev;
3597 po->mclist = ml->next;
3598 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3600 packet_dev_mc(dev, ml, -1);
3607 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
3609 struct sock *sk = sock->sk;
3610 struct packet_sock *po = pkt_sk(sk);
3613 if (level != SOL_PACKET)
3614 return -ENOPROTOOPT;
3617 case PACKET_ADD_MEMBERSHIP:
3618 case PACKET_DROP_MEMBERSHIP:
3620 struct packet_mreq_max mreq;
3622 memset(&mreq, 0, sizeof(mreq));
3623 if (len < sizeof(struct packet_mreq))
3625 if (len > sizeof(mreq))
3627 if (copy_from_user(&mreq, optval, len))
3629 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
3631 if (optname == PACKET_ADD_MEMBERSHIP)
3632 ret = packet_mc_add(sk, &mreq);
3634 ret = packet_mc_drop(sk, &mreq);
3638 case PACKET_RX_RING:
3639 case PACKET_TX_RING:
3641 union tpacket_req_u req_u;
3644 switch (po->tp_version) {
3647 len = sizeof(req_u.req);
3651 len = sizeof(req_u.req3);
3656 if (copy_from_user(&req_u.req, optval, len))
3658 return packet_set_ring(sk, &req_u, 0,
3659 optname == PACKET_TX_RING);
3661 case PACKET_COPY_THRESH:
3665 if (optlen != sizeof(val))
3667 if (copy_from_user(&val, optval, sizeof(val)))
3670 pkt_sk(sk)->copy_thresh = val;
3673 case PACKET_VERSION:
3677 if (optlen != sizeof(val))
3679 if (copy_from_user(&val, optval, sizeof(val)))
3690 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3693 po->tp_version = val;
3699 case PACKET_RESERVE:
3703 if (optlen != sizeof(val))
3705 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3707 if (copy_from_user(&val, optval, sizeof(val)))
3711 po->tp_reserve = val;
3718 if (optlen != sizeof(val))
3720 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3722 if (copy_from_user(&val, optval, sizeof(val)))
3724 po->tp_loss = !!val;
3727 case PACKET_AUXDATA:
3731 if (optlen < sizeof(val))
3733 if (copy_from_user(&val, optval, sizeof(val)))
3736 po->auxdata = !!val;
3739 case PACKET_ORIGDEV:
3743 if (optlen < sizeof(val))
3745 if (copy_from_user(&val, optval, sizeof(val)))
3748 po->origdev = !!val;
3751 case PACKET_VNET_HDR:
3755 if (sock->type != SOCK_RAW)
3757 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3759 if (optlen < sizeof(val))
3761 if (copy_from_user(&val, optval, sizeof(val)))
3764 po->has_vnet_hdr = !!val;
3767 case PACKET_TIMESTAMP:
3771 if (optlen != sizeof(val))
3773 if (copy_from_user(&val, optval, sizeof(val)))
3776 po->tp_tstamp = val;
3783 if (optlen != sizeof(val))
3785 if (copy_from_user(&val, optval, sizeof(val)))
3788 return fanout_add(sk, val & 0xffff, val >> 16);
3790 case PACKET_FANOUT_DATA:
3795 return fanout_set_data(po, optval, optlen);
3797 case PACKET_TX_HAS_OFF:
3801 if (optlen != sizeof(val))
3803 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3805 if (copy_from_user(&val, optval, sizeof(val)))
3807 po->tp_tx_has_off = !!val;
3810 case PACKET_QDISC_BYPASS:
3814 if (optlen != sizeof(val))
3816 if (copy_from_user(&val, optval, sizeof(val)))
3819 po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
3823 return -ENOPROTOOPT;
3827 static int packet_getsockopt(struct socket *sock, int level, int optname,
3828 char __user *optval, int __user *optlen)
3831 int val, lv = sizeof(val);
3832 struct sock *sk = sock->sk;
3833 struct packet_sock *po = pkt_sk(sk);
3835 union tpacket_stats_u st;
3836 struct tpacket_rollover_stats rstats;
3838 if (level != SOL_PACKET)
3839 return -ENOPROTOOPT;
3841 if (get_user(len, optlen))
3848 case PACKET_STATISTICS:
3849 spin_lock_bh(&sk->sk_receive_queue.lock);
3850 memcpy(&st, &po->stats, sizeof(st));
3851 memset(&po->stats, 0, sizeof(po->stats));
3852 spin_unlock_bh(&sk->sk_receive_queue.lock);
3854 if (po->tp_version == TPACKET_V3) {
3855 lv = sizeof(struct tpacket_stats_v3);
3856 st.stats3.tp_packets += st.stats3.tp_drops;
3859 lv = sizeof(struct tpacket_stats);
3860 st.stats1.tp_packets += st.stats1.tp_drops;
3865 case PACKET_AUXDATA:
3868 case PACKET_ORIGDEV:
3871 case PACKET_VNET_HDR:
3872 val = po->has_vnet_hdr;
3874 case PACKET_VERSION:
3875 val = po->tp_version;
3878 if (len > sizeof(int))
3880 if (len < sizeof(int))
3882 if (copy_from_user(&val, optval, len))
3886 val = sizeof(struct tpacket_hdr);
3889 val = sizeof(struct tpacket2_hdr);
3892 val = sizeof(struct tpacket3_hdr);
3898 case PACKET_RESERVE:
3899 val = po->tp_reserve;
3904 case PACKET_TIMESTAMP:
3905 val = po->tp_tstamp;
3909 ((u32)po->fanout->id |
3910 ((u32)po->fanout->type << 16) |
3911 ((u32)po->fanout->flags << 24)) :
3914 case PACKET_ROLLOVER_STATS:
3917 rstats.tp_all = atomic_long_read(&po->rollover->num);
3918 rstats.tp_huge = atomic_long_read(&po->rollover->num_huge);
3919 rstats.tp_failed = atomic_long_read(&po->rollover->num_failed);
3921 lv = sizeof(rstats);
3923 case PACKET_TX_HAS_OFF:
3924 val = po->tp_tx_has_off;
3926 case PACKET_QDISC_BYPASS:
3927 val = packet_use_direct_xmit(po);
3930 return -ENOPROTOOPT;
3935 if (put_user(len, optlen))
3937 if (copy_to_user(optval, data, len))
3943 #ifdef CONFIG_COMPAT
3944 static int compat_packet_setsockopt(struct socket *sock, int level, int optname,
3945 char __user *optval, unsigned int optlen)
3947 struct packet_sock *po = pkt_sk(sock->sk);
3949 if (level != SOL_PACKET)
3950 return -ENOPROTOOPT;
3952 if (optname == PACKET_FANOUT_DATA &&
3953 po->fanout && po->fanout->type == PACKET_FANOUT_CBPF) {
3954 optval = (char __user *)get_compat_bpf_fprog(optval);
3957 optlen = sizeof(struct sock_fprog);
3960 return packet_setsockopt(sock, level, optname, optval, optlen);
3964 static int packet_notifier(struct notifier_block *this,
3965 unsigned long msg, void *ptr)
3968 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3969 struct net *net = dev_net(dev);
3972 sk_for_each_rcu(sk, &net->packet.sklist) {
3973 struct packet_sock *po = pkt_sk(sk);
3976 case NETDEV_UNREGISTER:
3978 packet_dev_mclist_delete(dev, &po->mclist);
3982 if (dev->ifindex == po->ifindex) {
3983 spin_lock(&po->bind_lock);
3985 __unregister_prot_hook(sk, false);
3986 sk->sk_err = ENETDOWN;
3987 if (!sock_flag(sk, SOCK_DEAD))
3988 sk->sk_error_report(sk);
3990 if (msg == NETDEV_UNREGISTER) {
3991 packet_cached_dev_reset(po);
3993 if (po->prot_hook.dev)
3994 dev_put(po->prot_hook.dev);
3995 po->prot_hook.dev = NULL;
3997 spin_unlock(&po->bind_lock);
4001 if (dev->ifindex == po->ifindex) {
4002 spin_lock(&po->bind_lock);
4004 register_prot_hook(sk);
4005 spin_unlock(&po->bind_lock);
4015 static int packet_ioctl(struct socket *sock, unsigned int cmd,
4018 struct sock *sk = sock->sk;
4023 int amount = sk_wmem_alloc_get(sk);
4025 return put_user(amount, (int __user *)arg);
4029 struct sk_buff *skb;
4032 spin_lock_bh(&sk->sk_receive_queue.lock);
4033 skb = skb_peek(&sk->sk_receive_queue);
4036 spin_unlock_bh(&sk->sk_receive_queue.lock);
4037 return put_user(amount, (int __user *)arg);
4040 return sock_get_timestamp(sk, (struct timeval __user *)arg);
4042 return sock_get_timestampns(sk, (struct timespec __user *)arg);
4052 case SIOCGIFBRDADDR:
4053 case SIOCSIFBRDADDR:
4054 case SIOCGIFNETMASK:
4055 case SIOCSIFNETMASK:
4056 case SIOCGIFDSTADDR:
4057 case SIOCSIFDSTADDR:
4059 return inet_dgram_ops.ioctl(sock, cmd, arg);
4063 return -ENOIOCTLCMD;
4068 static unsigned int packet_poll(struct file *file, struct socket *sock,
4071 struct sock *sk = sock->sk;
4072 struct packet_sock *po = pkt_sk(sk);
4073 unsigned int mask = datagram_poll(file, sock, wait);
4075 spin_lock_bh(&sk->sk_receive_queue.lock);
4076 if (po->rx_ring.pg_vec) {
4077 if (!packet_previous_rx_frame(po, &po->rx_ring,
4079 mask |= POLLIN | POLLRDNORM;
4081 if (po->pressure && __packet_rcv_has_room(po, NULL) == ROOM_NORMAL)
4083 spin_unlock_bh(&sk->sk_receive_queue.lock);
4084 spin_lock_bh(&sk->sk_write_queue.lock);
4085 if (po->tx_ring.pg_vec) {
4086 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
4087 mask |= POLLOUT | POLLWRNORM;
4089 spin_unlock_bh(&sk->sk_write_queue.lock);
4094 /* Dirty? Well, I still did not learn better way to account
4098 static void packet_mm_open(struct vm_area_struct *vma)
4100 struct file *file = vma->vm_file;
4101 struct socket *sock = file->private_data;
4102 struct sock *sk = sock->sk;
4105 atomic_inc(&pkt_sk(sk)->mapped);
4108 static void packet_mm_close(struct vm_area_struct *vma)
4110 struct file *file = vma->vm_file;
4111 struct socket *sock = file->private_data;
4112 struct sock *sk = sock->sk;
4115 atomic_dec(&pkt_sk(sk)->mapped);
4118 static const struct vm_operations_struct packet_mmap_ops = {
4119 .open = packet_mm_open,
4120 .close = packet_mm_close,
4123 static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
4128 for (i = 0; i < len; i++) {
4129 if (likely(pg_vec[i].buffer)) {
4130 if (is_vmalloc_addr(pg_vec[i].buffer))
4131 vfree(pg_vec[i].buffer);
4133 free_pages((unsigned long)pg_vec[i].buffer,
4135 pg_vec[i].buffer = NULL;
4141 static char *alloc_one_pg_vec_page(unsigned long order)
4144 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
4145 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
4147 buffer = (char *) __get_free_pages(gfp_flags, order);
4151 /* __get_free_pages failed, fall back to vmalloc */
4152 buffer = vzalloc((1 << order) * PAGE_SIZE);
4156 /* vmalloc failed, lets dig into swap here */
4157 gfp_flags &= ~__GFP_NORETRY;
4158 buffer = (char *) __get_free_pages(gfp_flags, order);
4162 /* complete and utter failure */
4166 static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
4168 unsigned int block_nr = req->tp_block_nr;
4172 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
4173 if (unlikely(!pg_vec))
4176 for (i = 0; i < block_nr; i++) {
4177 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
4178 if (unlikely(!pg_vec[i].buffer))
4179 goto out_free_pgvec;
4186 free_pg_vec(pg_vec, order, block_nr);
4191 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
4192 int closing, int tx_ring)
4194 struct pgv *pg_vec = NULL;
4195 struct packet_sock *po = pkt_sk(sk);
4196 int was_running, order = 0;
4197 struct packet_ring_buffer *rb;
4198 struct sk_buff_head *rb_queue;
4201 /* Added to avoid minimal code churn */
4202 struct tpacket_req *req = &req_u->req;
4206 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
4207 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
4211 if (atomic_read(&po->mapped))
4213 if (packet_read_pending(rb))
4217 if (req->tp_block_nr) {
4218 /* Sanity tests and some calculations */
4220 if (unlikely(rb->pg_vec))
4223 switch (po->tp_version) {
4225 po->tp_hdrlen = TPACKET_HDRLEN;
4228 po->tp_hdrlen = TPACKET2_HDRLEN;
4231 po->tp_hdrlen = TPACKET3_HDRLEN;
4236 if (unlikely((int)req->tp_block_size <= 0))
4238 if (unlikely(!PAGE_ALIGNED(req->tp_block_size)))
4240 if (po->tp_version >= TPACKET_V3 &&
4241 req->tp_block_size <=
4242 BLK_PLUS_PRIV((u64)req_u->req3.tp_sizeof_priv))
4244 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
4247 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
4250 rb->frames_per_block = req->tp_block_size / req->tp_frame_size;
4251 if (unlikely(rb->frames_per_block == 0))
4253 if (unlikely(req->tp_block_size > UINT_MAX / req->tp_block_nr))
4255 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
4260 order = get_order(req->tp_block_size);
4261 pg_vec = alloc_pg_vec(req, order);
4262 if (unlikely(!pg_vec))
4264 switch (po->tp_version) {
4266 /* Block transmit is not supported yet */
4268 init_prb_bdqc(po, rb, pg_vec, req_u);
4270 struct tpacket_req3 *req3 = &req_u->req3;
4272 if (req3->tp_retire_blk_tov ||
4273 req3->tp_sizeof_priv ||
4274 req3->tp_feature_req_word) {
4287 if (unlikely(req->tp_frame_nr))
4292 /* Detach socket from network */
4293 spin_lock(&po->bind_lock);
4294 was_running = po->running;
4298 __unregister_prot_hook(sk, false);
4300 spin_unlock(&po->bind_lock);
4305 mutex_lock(&po->pg_vec_lock);
4306 if (closing || atomic_read(&po->mapped) == 0) {
4308 spin_lock_bh(&rb_queue->lock);
4309 swap(rb->pg_vec, pg_vec);
4310 rb->frame_max = (req->tp_frame_nr - 1);
4312 rb->frame_size = req->tp_frame_size;
4313 spin_unlock_bh(&rb_queue->lock);
4315 swap(rb->pg_vec_order, order);
4316 swap(rb->pg_vec_len, req->tp_block_nr);
4318 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
4319 po->prot_hook.func = (po->rx_ring.pg_vec) ?
4320 tpacket_rcv : packet_rcv;
4321 skb_queue_purge(rb_queue);
4322 if (atomic_read(&po->mapped))
4323 pr_err("packet_mmap: vma is busy: %d\n",
4324 atomic_read(&po->mapped));
4326 mutex_unlock(&po->pg_vec_lock);
4328 spin_lock(&po->bind_lock);
4331 register_prot_hook(sk);
4333 spin_unlock(&po->bind_lock);
4334 if (closing && (po->tp_version > TPACKET_V2)) {
4335 /* Because we don't support block-based V3 on tx-ring */
4337 prb_shutdown_retire_blk_timer(po, rb_queue);
4341 free_pg_vec(pg_vec, order, req->tp_block_nr);
4347 static int packet_mmap(struct file *file, struct socket *sock,
4348 struct vm_area_struct *vma)
4350 struct sock *sk = sock->sk;
4351 struct packet_sock *po = pkt_sk(sk);
4352 unsigned long size, expected_size;
4353 struct packet_ring_buffer *rb;
4354 unsigned long start;
4361 mutex_lock(&po->pg_vec_lock);
4364 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4366 expected_size += rb->pg_vec_len
4372 if (expected_size == 0)
4375 size = vma->vm_end - vma->vm_start;
4376 if (size != expected_size)
4379 start = vma->vm_start;
4380 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4381 if (rb->pg_vec == NULL)
4384 for (i = 0; i < rb->pg_vec_len; i++) {
4386 void *kaddr = rb->pg_vec[i].buffer;
4389 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
4390 page = pgv_to_page(kaddr);
4391 err = vm_insert_page(vma, start, page);
4400 atomic_inc(&po->mapped);
4401 vma->vm_ops = &packet_mmap_ops;
4405 mutex_unlock(&po->pg_vec_lock);
4409 static const struct proto_ops packet_ops_spkt = {
4410 .family = PF_PACKET,
4411 .owner = THIS_MODULE,
4412 .release = packet_release,
4413 .bind = packet_bind_spkt,
4414 .connect = sock_no_connect,
4415 .socketpair = sock_no_socketpair,
4416 .accept = sock_no_accept,
4417 .getname = packet_getname_spkt,
4418 .poll = datagram_poll,
4419 .ioctl = packet_ioctl,
4420 .listen = sock_no_listen,
4421 .shutdown = sock_no_shutdown,
4422 .setsockopt = sock_no_setsockopt,
4423 .getsockopt = sock_no_getsockopt,
4424 .sendmsg = packet_sendmsg_spkt,
4425 .recvmsg = packet_recvmsg,
4426 .mmap = sock_no_mmap,
4427 .sendpage = sock_no_sendpage,
4430 static const struct proto_ops packet_ops = {
4431 .family = PF_PACKET,
4432 .owner = THIS_MODULE,
4433 .release = packet_release,
4434 .bind = packet_bind,
4435 .connect = sock_no_connect,
4436 .socketpair = sock_no_socketpair,
4437 .accept = sock_no_accept,
4438 .getname = packet_getname,
4439 .poll = packet_poll,
4440 .ioctl = packet_ioctl,
4441 .listen = sock_no_listen,
4442 .shutdown = sock_no_shutdown,
4443 .setsockopt = packet_setsockopt,
4444 .getsockopt = packet_getsockopt,
4445 #ifdef CONFIG_COMPAT
4446 .compat_setsockopt = compat_packet_setsockopt,
4448 .sendmsg = packet_sendmsg,
4449 .recvmsg = packet_recvmsg,
4450 .mmap = packet_mmap,
4451 .sendpage = sock_no_sendpage,
4454 static const struct net_proto_family packet_family_ops = {
4455 .family = PF_PACKET,
4456 .create = packet_create,
4457 .owner = THIS_MODULE,
4460 static struct notifier_block packet_netdev_notifier = {
4461 .notifier_call = packet_notifier,
4464 #ifdef CONFIG_PROC_FS
4466 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
4469 struct net *net = seq_file_net(seq);
4472 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
4475 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4477 struct net *net = seq_file_net(seq);
4478 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
4481 static void packet_seq_stop(struct seq_file *seq, void *v)
4487 static int packet_seq_show(struct seq_file *seq, void *v)
4489 if (v == SEQ_START_TOKEN)
4490 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4492 struct sock *s = sk_entry(v);
4493 const struct packet_sock *po = pkt_sk(s);
4496 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
4498 refcount_read(&s->sk_refcnt),
4503 atomic_read(&s->sk_rmem_alloc),
4504 from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)),
4511 static const struct seq_operations packet_seq_ops = {
4512 .start = packet_seq_start,
4513 .next = packet_seq_next,
4514 .stop = packet_seq_stop,
4515 .show = packet_seq_show,
4518 static int packet_seq_open(struct inode *inode, struct file *file)
4520 return seq_open_net(inode, file, &packet_seq_ops,
4521 sizeof(struct seq_net_private));
4524 static const struct file_operations packet_seq_fops = {
4525 .owner = THIS_MODULE,
4526 .open = packet_seq_open,
4528 .llseek = seq_lseek,
4529 .release = seq_release_net,
4534 static int __net_init packet_net_init(struct net *net)
4536 mutex_init(&net->packet.sklist_lock);
4537 INIT_HLIST_HEAD(&net->packet.sklist);
4539 if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops))
4545 static void __net_exit packet_net_exit(struct net *net)
4547 remove_proc_entry("packet", net->proc_net);
4550 static struct pernet_operations packet_net_ops = {
4551 .init = packet_net_init,
4552 .exit = packet_net_exit,
4556 static void __exit packet_exit(void)
4558 unregister_netdevice_notifier(&packet_netdev_notifier);
4559 unregister_pernet_subsys(&packet_net_ops);
4560 sock_unregister(PF_PACKET);
4561 proto_unregister(&packet_proto);
4564 static int __init packet_init(void)
4566 int rc = proto_register(&packet_proto, 0);
4571 sock_register(&packet_family_ops);
4572 register_pernet_subsys(&packet_net_ops);
4573 register_netdevice_notifier(&packet_netdev_notifier);
4578 module_init(packet_init);
4579 module_exit(packet_exit);
4580 MODULE_LICENSE("GPL");
4581 MODULE_ALIAS_NETPROTO(PF_PACKET);