2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * PACKET - implements raw packet sockets.
9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Alan Cox, <gw4pts@gw4pts.ampr.org>
13 * Alan Cox : verify_area() now used correctly
14 * Alan Cox : new skbuff lists, look ma no backlogs!
15 * Alan Cox : tidied skbuff lists.
16 * Alan Cox : Now uses generic datagram routines I
17 * added. Also fixed the peek/read crash
18 * from all old Linux datagram code.
19 * Alan Cox : Uses the improved datagram code.
20 * Alan Cox : Added NULL's for socket options.
21 * Alan Cox : Re-commented the code.
22 * Alan Cox : Use new kernel side addressing
23 * Rob Janssen : Correct MTU usage.
24 * Dave Platt : Counter leaks caused by incorrect
25 * interrupt locking and some slightly
26 * dubious gcc output. Can you read
27 * compiler: it said _VOLATILE_
28 * Richard Kooijman : Timestamp fixes.
29 * Alan Cox : New buffers. Use sk->mac.raw.
30 * Alan Cox : sendmsg/recvmsg support.
31 * Alan Cox : Protocol setting support
32 * Alexey Kuznetsov : Untied from IPv4 stack.
33 * Cyrus Durgin : Fixed kerneld for kmod.
34 * Michal Ostrowski : Module initialization cleanup.
35 * Ulises Alonso : Frame number limit removal and
36 * packet_set_ring memory leak.
37 * Eric Biederman : Allow for > 8 byte hardware addresses.
38 * The convention is that longer addresses
39 * will simply extend the hardware address
40 * byte arrays at the end of sockaddr_ll
42 * Johann Baudy : Added TX RING.
43 * Chetan Loke : Implemented TPACKET_V3 block abstraction
45 * Copyright (C) 2011, <lokec@ccs.neu.edu>
48 * This program is free software; you can redistribute it and/or
49 * modify it under the terms of the GNU General Public License
50 * as published by the Free Software Foundation; either version
51 * 2 of the License, or (at your option) any later version.
55 #include <linux/types.h>
57 #include <linux/capability.h>
58 #include <linux/fcntl.h>
59 #include <linux/socket.h>
61 #include <linux/inet.h>
62 #include <linux/netdevice.h>
63 #include <linux/if_packet.h>
64 #include <linux/wireless.h>
65 #include <linux/kernel.h>
66 #include <linux/kmod.h>
67 #include <linux/slab.h>
68 #include <linux/vmalloc.h>
69 #include <net/net_namespace.h>
71 #include <net/protocol.h>
72 #include <linux/skbuff.h>
74 #include <linux/errno.h>
75 #include <linux/timer.h>
76 #include <asm/uaccess.h>
77 #include <asm/ioctls.h>
79 #include <asm/cacheflush.h>
81 #include <linux/proc_fs.h>
82 #include <linux/seq_file.h>
83 #include <linux/poll.h>
84 #include <linux/module.h>
85 #include <linux/init.h>
86 #include <linux/mutex.h>
87 #include <linux/if_vlan.h>
88 #include <linux/virtio_net.h>
89 #include <linux/errqueue.h>
90 #include <linux/net_tstamp.h>
91 #include <linux/percpu.h>
93 #include <net/inet_common.h>
95 #include <linux/bpf.h>
96 #include <net/compat.h>
102 - if device has no dev->hard_header routine, it adds and removes ll header
103 inside itself. In this case ll header is invisible outside of device,
104 but higher levels still should reserve dev->hard_header_len.
105 Some devices are enough clever to reallocate skb, when header
106 will not fit to reserved space (tunnel), another ones are silly
108 - packet socket receives packets with pulled ll header,
109 so that SOCK_RAW should push it back.
114 Incoming, dev->hard_header!=NULL
115 mac_header -> ll header
118 Outgoing, dev->hard_header!=NULL
119 mac_header -> ll header
122 Incoming, dev->hard_header==NULL
123 mac_header -> UNKNOWN position. It is very likely, that it points to ll
124 header. PPP makes it, that is wrong, because introduce
125 assymetry between rx and tx paths.
128 Outgoing, dev->hard_header==NULL
129 mac_header -> data. ll header is still not built!
133 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
139 dev->hard_header != NULL
140 mac_header -> ll header
143 dev->hard_header == NULL (ll header is added by device, we cannot control it)
147 We should set nh.raw on output to correct posistion,
148 packet classifier depends on it.
151 /* Private packet socket structures. */
153 /* identical to struct packet_mreq except it has
154 * a longer address field.
156 struct packet_mreq_max {
158 unsigned short mr_type;
159 unsigned short mr_alen;
160 unsigned char mr_address[MAX_ADDR_LEN];
164 struct tpacket_hdr *h1;
165 struct tpacket2_hdr *h2;
166 struct tpacket3_hdr *h3;
170 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
171 int closing, int tx_ring);
173 #define V3_ALIGNMENT (8)
175 #define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT))
177 #define BLK_PLUS_PRIV(sz_of_priv) \
178 (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT))
180 #define PGV_FROM_VMALLOC 1
182 #define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status)
183 #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts)
184 #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt)
185 #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len)
186 #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num)
187 #define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
188 #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x)))
191 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
192 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
193 struct packet_type *pt, struct net_device *orig_dev);
195 static void *packet_previous_frame(struct packet_sock *po,
196 struct packet_ring_buffer *rb,
198 static void packet_increment_head(struct packet_ring_buffer *buff);
199 static int prb_curr_blk_in_use(struct tpacket_kbdq_core *,
200 struct tpacket_block_desc *);
201 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *,
202 struct packet_sock *);
203 static void prb_retire_current_block(struct tpacket_kbdq_core *,
204 struct packet_sock *, unsigned int status);
205 static int prb_queue_frozen(struct tpacket_kbdq_core *);
206 static void prb_open_block(struct tpacket_kbdq_core *,
207 struct tpacket_block_desc *);
208 static void prb_retire_rx_blk_timer_expired(unsigned long);
209 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *);
210 static void prb_init_blk_timer(struct packet_sock *,
211 struct tpacket_kbdq_core *,
212 void (*func) (unsigned long));
213 static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *);
214 static void prb_clear_rxhash(struct tpacket_kbdq_core *,
215 struct tpacket3_hdr *);
216 static void prb_fill_vlan_info(struct tpacket_kbdq_core *,
217 struct tpacket3_hdr *);
218 static void packet_flush_mclist(struct sock *sk);
220 struct packet_skb_cb {
222 struct sockaddr_pkt pkt;
224 /* Trick: alias skb original length with
225 * ll.sll_family and ll.protocol in order
228 unsigned int origlen;
229 struct sockaddr_ll ll;
234 #define vio_le() virtio_legacy_is_little_endian()
236 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
238 #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
239 #define GET_PBLOCK_DESC(x, bid) \
240 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
241 #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
242 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
243 #define GET_NEXT_PRB_BLK_NUM(x) \
244 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
245 ((x)->kactive_blk_num+1) : 0)
247 static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
248 static void __fanout_link(struct sock *sk, struct packet_sock *po);
250 static int packet_direct_xmit(struct sk_buff *skb)
252 struct net_device *dev = skb->dev;
253 netdev_features_t features;
254 struct netdev_queue *txq;
255 int ret = NETDEV_TX_BUSY;
257 if (unlikely(!netif_running(dev) ||
258 !netif_carrier_ok(dev)))
261 features = netif_skb_features(skb);
262 if (skb_needs_linearize(skb, features) &&
263 __skb_linearize(skb))
266 txq = skb_get_tx_queue(dev, skb);
270 HARD_TX_LOCK(dev, txq, smp_processor_id());
271 if (!netif_xmit_frozen_or_drv_stopped(txq))
272 ret = netdev_start_xmit(skb, dev, txq, false);
273 HARD_TX_UNLOCK(dev, txq);
277 if (!dev_xmit_complete(ret))
282 atomic_long_inc(&dev->tx_dropped);
284 return NET_XMIT_DROP;
287 static struct net_device *packet_cached_dev_get(struct packet_sock *po)
289 struct net_device *dev;
292 dev = rcu_dereference(po->cached_dev);
300 static void packet_cached_dev_assign(struct packet_sock *po,
301 struct net_device *dev)
303 rcu_assign_pointer(po->cached_dev, dev);
306 static void packet_cached_dev_reset(struct packet_sock *po)
308 RCU_INIT_POINTER(po->cached_dev, NULL);
311 static bool packet_use_direct_xmit(const struct packet_sock *po)
313 return po->xmit == packet_direct_xmit;
316 static u16 __packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
318 return (u16) raw_smp_processor_id() % dev->real_num_tx_queues;
321 static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
323 const struct net_device_ops *ops = dev->netdev_ops;
326 if (ops->ndo_select_queue) {
327 queue_index = ops->ndo_select_queue(dev, skb, NULL,
328 __packet_pick_tx_queue);
329 queue_index = netdev_cap_txqueue(dev, queue_index);
331 queue_index = __packet_pick_tx_queue(dev, skb);
334 skb_set_queue_mapping(skb, queue_index);
337 /* register_prot_hook must be invoked with the po->bind_lock held,
338 * or from a context in which asynchronous accesses to the packet
339 * socket is not possible (packet_create()).
341 static void register_prot_hook(struct sock *sk)
343 struct packet_sock *po = pkt_sk(sk);
347 __fanout_link(sk, po);
349 dev_add_pack(&po->prot_hook);
356 /* {,__}unregister_prot_hook() must be invoked with the po->bind_lock
357 * held. If the sync parameter is true, we will temporarily drop
358 * the po->bind_lock and do a synchronize_net to make sure no
359 * asynchronous packet processing paths still refer to the elements
360 * of po->prot_hook. If the sync parameter is false, it is the
361 * callers responsibility to take care of this.
363 static void __unregister_prot_hook(struct sock *sk, bool sync)
365 struct packet_sock *po = pkt_sk(sk);
370 __fanout_unlink(sk, po);
372 __dev_remove_pack(&po->prot_hook);
377 spin_unlock(&po->bind_lock);
379 spin_lock(&po->bind_lock);
383 static void unregister_prot_hook(struct sock *sk, bool sync)
385 struct packet_sock *po = pkt_sk(sk);
388 __unregister_prot_hook(sk, sync);
391 static inline struct page * __pure pgv_to_page(void *addr)
393 if (is_vmalloc_addr(addr))
394 return vmalloc_to_page(addr);
395 return virt_to_page(addr);
398 static void __packet_set_status(struct packet_sock *po, void *frame, int status)
400 union tpacket_uhdr h;
403 switch (po->tp_version) {
405 h.h1->tp_status = status;
406 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
409 h.h2->tp_status = status;
410 flush_dcache_page(pgv_to_page(&h.h2->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;
437 WARN(1, "TPACKET version not supported.\n");
443 static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts,
446 struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
449 (flags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
450 ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts))
451 return TP_STATUS_TS_RAW_HARDWARE;
453 if (ktime_to_timespec_cond(skb->tstamp, ts))
454 return TP_STATUS_TS_SOFTWARE;
459 static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame,
462 union tpacket_uhdr h;
466 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
470 switch (po->tp_version) {
472 h.h1->tp_sec = ts.tv_sec;
473 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
476 h.h2->tp_sec = ts.tv_sec;
477 h.h2->tp_nsec = ts.tv_nsec;
481 WARN(1, "TPACKET version not supported.\n");
485 /* one flush is safe, as both fields always lie on the same cacheline */
486 flush_dcache_page(pgv_to_page(&h.h1->tp_sec));
492 static void *packet_lookup_frame(struct packet_sock *po,
493 struct packet_ring_buffer *rb,
494 unsigned int position,
497 unsigned int pg_vec_pos, frame_offset;
498 union tpacket_uhdr h;
500 pg_vec_pos = position / rb->frames_per_block;
501 frame_offset = position % rb->frames_per_block;
503 h.raw = rb->pg_vec[pg_vec_pos].buffer +
504 (frame_offset * rb->frame_size);
506 if (status != __packet_get_status(po, h.raw))
512 static void *packet_current_frame(struct packet_sock *po,
513 struct packet_ring_buffer *rb,
516 return packet_lookup_frame(po, rb, rb->head, status);
519 static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc)
521 del_timer_sync(&pkc->retire_blk_timer);
524 static void prb_shutdown_retire_blk_timer(struct packet_sock *po,
525 struct sk_buff_head *rb_queue)
527 struct tpacket_kbdq_core *pkc;
529 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
531 spin_lock_bh(&rb_queue->lock);
532 pkc->delete_blk_timer = 1;
533 spin_unlock_bh(&rb_queue->lock);
535 prb_del_retire_blk_timer(pkc);
538 static void prb_init_blk_timer(struct packet_sock *po,
539 struct tpacket_kbdq_core *pkc,
540 void (*func) (unsigned long))
542 init_timer(&pkc->retire_blk_timer);
543 pkc->retire_blk_timer.data = (long)po;
544 pkc->retire_blk_timer.function = func;
545 pkc->retire_blk_timer.expires = jiffies;
548 static void prb_setup_retire_blk_timer(struct packet_sock *po)
550 struct tpacket_kbdq_core *pkc;
552 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
553 prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired);
556 static int prb_calc_retire_blk_tmo(struct packet_sock *po,
557 int blk_size_in_bytes)
559 struct net_device *dev;
560 unsigned int mbits = 0, msec = 0, div = 0, tmo = 0;
561 struct ethtool_link_ksettings ecmd;
565 dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex);
566 if (unlikely(!dev)) {
568 return DEFAULT_PRB_RETIRE_TOV;
570 err = __ethtool_get_link_ksettings(dev, &ecmd);
574 * If the link speed is so slow you don't really
575 * need to worry about perf anyways
577 if (ecmd.base.speed < SPEED_1000 ||
578 ecmd.base.speed == SPEED_UNKNOWN) {
579 return DEFAULT_PRB_RETIRE_TOV;
582 div = ecmd.base.speed / 1000;
586 mbits = (blk_size_in_bytes * 8) / (1024 * 1024);
598 static void prb_init_ft_ops(struct tpacket_kbdq_core *p1,
599 union tpacket_req_u *req_u)
601 p1->feature_req_word = req_u->req3.tp_feature_req_word;
604 static void init_prb_bdqc(struct packet_sock *po,
605 struct packet_ring_buffer *rb,
607 union tpacket_req_u *req_u)
609 struct tpacket_kbdq_core *p1 = GET_PBDQC_FROM_RB(rb);
610 struct tpacket_block_desc *pbd;
612 memset(p1, 0x0, sizeof(*p1));
614 p1->knxt_seq_num = 1;
616 pbd = (struct tpacket_block_desc *)pg_vec[0].buffer;
617 p1->pkblk_start = pg_vec[0].buffer;
618 p1->kblk_size = req_u->req3.tp_block_size;
619 p1->knum_blocks = req_u->req3.tp_block_nr;
620 p1->hdrlen = po->tp_hdrlen;
621 p1->version = po->tp_version;
622 p1->last_kactive_blk_num = 0;
623 po->stats.stats3.tp_freeze_q_cnt = 0;
624 if (req_u->req3.tp_retire_blk_tov)
625 p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov;
627 p1->retire_blk_tov = prb_calc_retire_blk_tmo(po,
628 req_u->req3.tp_block_size);
629 p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov);
630 p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv;
632 p1->max_frame_len = p1->kblk_size - BLK_PLUS_PRIV(p1->blk_sizeof_priv);
633 prb_init_ft_ops(p1, req_u);
634 prb_setup_retire_blk_timer(po);
635 prb_open_block(p1, pbd);
638 /* Do NOT update the last_blk_num first.
639 * Assumes sk_buff_head lock is held.
641 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc)
643 mod_timer(&pkc->retire_blk_timer,
644 jiffies + pkc->tov_in_jiffies);
645 pkc->last_kactive_blk_num = pkc->kactive_blk_num;
650 * 1) We refresh the timer only when we open a block.
651 * By doing this we don't waste cycles refreshing the timer
652 * on packet-by-packet basis.
654 * With a 1MB block-size, on a 1Gbps line, it will take
655 * i) ~8 ms to fill a block + ii) memcpy etc.
656 * In this cut we are not accounting for the memcpy time.
658 * So, if the user sets the 'tmo' to 10ms then the timer
659 * will never fire while the block is still getting filled
660 * (which is what we want). However, the user could choose
661 * to close a block early and that's fine.
663 * But when the timer does fire, we check whether or not to refresh it.
664 * Since the tmo granularity is in msecs, it is not too expensive
665 * to refresh the timer, lets say every '8' msecs.
666 * Either the user can set the 'tmo' or we can derive it based on
667 * a) line-speed and b) block-size.
668 * prb_calc_retire_blk_tmo() calculates the tmo.
671 static void prb_retire_rx_blk_timer_expired(unsigned long data)
673 struct packet_sock *po = (struct packet_sock *)data;
674 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
676 struct tpacket_block_desc *pbd;
678 spin_lock(&po->sk.sk_receive_queue.lock);
680 frozen = prb_queue_frozen(pkc);
681 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
683 if (unlikely(pkc->delete_blk_timer))
686 /* We only need to plug the race when the block is partially filled.
688 * lock(); increment BLOCK_NUM_PKTS; unlock()
689 * copy_bits() is in progress ...
690 * timer fires on other cpu:
691 * we can't retire the current block because copy_bits
695 if (BLOCK_NUM_PKTS(pbd)) {
696 while (atomic_read(&pkc->blk_fill_in_prog)) {
697 /* Waiting for skb_copy_bits to finish... */
702 if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) {
704 if (!BLOCK_NUM_PKTS(pbd)) {
705 /* An empty block. Just refresh the timer. */
708 prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO);
709 if (!prb_dispatch_next_block(pkc, po))
714 /* Case 1. Queue was frozen because user-space was
717 if (prb_curr_blk_in_use(pkc, pbd)) {
719 * Ok, user-space is still behind.
720 * So just refresh the timer.
724 /* Case 2. queue was frozen,user-space caught up,
725 * now the link went idle && the timer fired.
726 * We don't have a block to close.So we open this
727 * block and restart the timer.
728 * opening a block thaws the queue,restarts timer
729 * Thawing/timer-refresh is a side effect.
731 prb_open_block(pkc, pbd);
738 _prb_refresh_rx_retire_blk_timer(pkc);
741 spin_unlock(&po->sk.sk_receive_queue.lock);
744 static void prb_flush_block(struct tpacket_kbdq_core *pkc1,
745 struct tpacket_block_desc *pbd1, __u32 status)
747 /* Flush everything minus the block header */
749 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
754 /* Skip the block header(we know header WILL fit in 4K) */
757 end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end);
758 for (; start < end; start += PAGE_SIZE)
759 flush_dcache_page(pgv_to_page(start));
764 /* Now update the block status. */
766 BLOCK_STATUS(pbd1) = status;
768 /* Flush the block header */
770 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
772 flush_dcache_page(pgv_to_page(start));
782 * 2) Increment active_blk_num
784 * Note:We DONT refresh the timer on purpose.
785 * Because almost always the next block will be opened.
787 static void prb_close_block(struct tpacket_kbdq_core *pkc1,
788 struct tpacket_block_desc *pbd1,
789 struct packet_sock *po, unsigned int stat)
791 __u32 status = TP_STATUS_USER | stat;
793 struct tpacket3_hdr *last_pkt;
794 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
795 struct sock *sk = &po->sk;
797 if (po->stats.stats3.tp_drops)
798 status |= TP_STATUS_LOSING;
800 last_pkt = (struct tpacket3_hdr *)pkc1->prev;
801 last_pkt->tp_next_offset = 0;
803 /* Get the ts of the last pkt */
804 if (BLOCK_NUM_PKTS(pbd1)) {
805 h1->ts_last_pkt.ts_sec = last_pkt->tp_sec;
806 h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec;
808 /* Ok, we tmo'd - so get the current time.
810 * It shouldn't really happen as we don't close empty
811 * blocks. See prb_retire_rx_blk_timer_expired().
815 h1->ts_last_pkt.ts_sec = ts.tv_sec;
816 h1->ts_last_pkt.ts_nsec = ts.tv_nsec;
821 /* Flush the block */
822 prb_flush_block(pkc1, pbd1, status);
824 sk->sk_data_ready(sk);
826 pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1);
829 static void prb_thaw_queue(struct tpacket_kbdq_core *pkc)
831 pkc->reset_pending_on_curr_blk = 0;
835 * Side effect of opening a block:
837 * 1) prb_queue is thawed.
838 * 2) retire_blk_timer is refreshed.
841 static void prb_open_block(struct tpacket_kbdq_core *pkc1,
842 struct tpacket_block_desc *pbd1)
845 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
849 /* We could have just memset this but we will lose the
850 * flexibility of making the priv area sticky
853 BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++;
854 BLOCK_NUM_PKTS(pbd1) = 0;
855 BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
859 h1->ts_first_pkt.ts_sec = ts.tv_sec;
860 h1->ts_first_pkt.ts_nsec = ts.tv_nsec;
862 pkc1->pkblk_start = (char *)pbd1;
863 pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
865 BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
866 BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN;
868 pbd1->version = pkc1->version;
869 pkc1->prev = pkc1->nxt_offset;
870 pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size;
872 prb_thaw_queue(pkc1);
873 _prb_refresh_rx_retire_blk_timer(pkc1);
879 * Queue freeze logic:
880 * 1) Assume tp_block_nr = 8 blocks.
881 * 2) At time 't0', user opens Rx ring.
882 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
883 * 4) user-space is either sleeping or processing block '0'.
884 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
885 * it will close block-7,loop around and try to fill block '0'.
887 * __packet_lookup_frame_in_block
888 * prb_retire_current_block()
889 * prb_dispatch_next_block()
890 * |->(BLOCK_STATUS == USER) evaluates to true
891 * 5.1) Since block-0 is currently in-use, we just freeze the queue.
892 * 6) Now there are two cases:
893 * 6.1) Link goes idle right after the queue is frozen.
894 * But remember, the last open_block() refreshed the timer.
895 * When this timer expires,it will refresh itself so that we can
896 * re-open block-0 in near future.
897 * 6.2) Link is busy and keeps on receiving packets. This is a simple
898 * case and __packet_lookup_frame_in_block will check if block-0
899 * is free and can now be re-used.
901 static void prb_freeze_queue(struct tpacket_kbdq_core *pkc,
902 struct packet_sock *po)
904 pkc->reset_pending_on_curr_blk = 1;
905 po->stats.stats3.tp_freeze_q_cnt++;
908 #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
911 * If the next block is free then we will dispatch it
912 * and return a good offset.
913 * Else, we will freeze the queue.
914 * So, caller must check the return value.
916 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc,
917 struct packet_sock *po)
919 struct tpacket_block_desc *pbd;
923 /* 1. Get current block num */
924 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
926 /* 2. If this block is currently in_use then freeze the queue */
927 if (TP_STATUS_USER & BLOCK_STATUS(pbd)) {
928 prb_freeze_queue(pkc, po);
934 * open this block and return the offset where the first packet
935 * needs to get stored.
937 prb_open_block(pkc, pbd);
938 return (void *)pkc->nxt_offset;
941 static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
942 struct packet_sock *po, unsigned int status)
944 struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
946 /* retire/close the current block */
947 if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) {
949 * Plug the case where copy_bits() is in progress on
950 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
951 * have space to copy the pkt in the current block and
952 * called prb_retire_current_block()
954 * We don't need to worry about the TMO case because
955 * the timer-handler already handled this case.
957 if (!(status & TP_STATUS_BLK_TMO)) {
958 while (atomic_read(&pkc->blk_fill_in_prog)) {
959 /* Waiting for skb_copy_bits to finish... */
963 prb_close_block(pkc, pbd, po, status);
968 static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc,
969 struct tpacket_block_desc *pbd)
971 return TP_STATUS_USER & BLOCK_STATUS(pbd);
974 static int prb_queue_frozen(struct tpacket_kbdq_core *pkc)
976 return pkc->reset_pending_on_curr_blk;
979 static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb)
981 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
982 atomic_dec(&pkc->blk_fill_in_prog);
985 static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc,
986 struct tpacket3_hdr *ppd)
988 ppd->hv1.tp_rxhash = skb_get_hash(pkc->skb);
991 static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc,
992 struct tpacket3_hdr *ppd)
994 ppd->hv1.tp_rxhash = 0;
997 static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
998 struct tpacket3_hdr *ppd)
1000 if (skb_vlan_tag_present(pkc->skb)) {
1001 ppd->hv1.tp_vlan_tci = skb_vlan_tag_get(pkc->skb);
1002 ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->vlan_proto);
1003 ppd->tp_status = TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
1005 ppd->hv1.tp_vlan_tci = 0;
1006 ppd->hv1.tp_vlan_tpid = 0;
1007 ppd->tp_status = TP_STATUS_AVAILABLE;
1011 static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc,
1012 struct tpacket3_hdr *ppd)
1014 ppd->hv1.tp_padding = 0;
1015 prb_fill_vlan_info(pkc, ppd);
1017 if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH)
1018 prb_fill_rxhash(pkc, ppd);
1020 prb_clear_rxhash(pkc, ppd);
1023 static void prb_fill_curr_block(char *curr,
1024 struct tpacket_kbdq_core *pkc,
1025 struct tpacket_block_desc *pbd,
1028 struct tpacket3_hdr *ppd;
1030 ppd = (struct tpacket3_hdr *)curr;
1031 ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len);
1033 pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len);
1034 BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len);
1035 BLOCK_NUM_PKTS(pbd) += 1;
1036 atomic_inc(&pkc->blk_fill_in_prog);
1037 prb_run_all_ft_ops(pkc, ppd);
1040 /* Assumes caller has the sk->rx_queue.lock */
1041 static void *__packet_lookup_frame_in_block(struct packet_sock *po,
1042 struct sk_buff *skb,
1047 struct tpacket_kbdq_core *pkc;
1048 struct tpacket_block_desc *pbd;
1051 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
1052 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1054 /* Queue is frozen when user space is lagging behind */
1055 if (prb_queue_frozen(pkc)) {
1057 * Check if that last block which caused the queue to freeze,
1058 * is still in_use by user-space.
1060 if (prb_curr_blk_in_use(pkc, pbd)) {
1061 /* Can't record this packet */
1065 * Ok, the block was released by user-space.
1066 * Now let's open that block.
1067 * opening a block also thaws the queue.
1068 * Thawing is a side effect.
1070 prb_open_block(pkc, pbd);
1075 curr = pkc->nxt_offset;
1077 end = (char *)pbd + pkc->kblk_size;
1079 /* first try the current block */
1080 if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) {
1081 prb_fill_curr_block(curr, pkc, pbd, len);
1082 return (void *)curr;
1085 /* Ok, close the current block */
1086 prb_retire_current_block(pkc, po, 0);
1088 /* Now, try to dispatch the next block */
1089 curr = (char *)prb_dispatch_next_block(pkc, po);
1091 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1092 prb_fill_curr_block(curr, pkc, pbd, len);
1093 return (void *)curr;
1097 * No free blocks are available.user_space hasn't caught up yet.
1098 * Queue was just frozen and now this packet will get dropped.
1103 static void *packet_current_rx_frame(struct packet_sock *po,
1104 struct sk_buff *skb,
1105 int status, unsigned int len)
1108 switch (po->tp_version) {
1111 curr = packet_lookup_frame(po, &po->rx_ring,
1112 po->rx_ring.head, status);
1115 return __packet_lookup_frame_in_block(po, skb, status, len);
1117 WARN(1, "TPACKET version not supported\n");
1123 static void *prb_lookup_block(struct packet_sock *po,
1124 struct packet_ring_buffer *rb,
1128 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
1129 struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx);
1131 if (status != BLOCK_STATUS(pbd))
1136 static int prb_previous_blk_num(struct packet_ring_buffer *rb)
1139 if (rb->prb_bdqc.kactive_blk_num)
1140 prev = rb->prb_bdqc.kactive_blk_num-1;
1142 prev = rb->prb_bdqc.knum_blocks-1;
1146 /* Assumes caller has held the rx_queue.lock */
1147 static void *__prb_previous_block(struct packet_sock *po,
1148 struct packet_ring_buffer *rb,
1151 unsigned int previous = prb_previous_blk_num(rb);
1152 return prb_lookup_block(po, rb, previous, status);
1155 static void *packet_previous_rx_frame(struct packet_sock *po,
1156 struct packet_ring_buffer *rb,
1159 if (po->tp_version <= TPACKET_V2)
1160 return packet_previous_frame(po, rb, status);
1162 return __prb_previous_block(po, rb, status);
1165 static void packet_increment_rx_head(struct packet_sock *po,
1166 struct packet_ring_buffer *rb)
1168 switch (po->tp_version) {
1171 return packet_increment_head(rb);
1174 WARN(1, "TPACKET version not supported.\n");
1180 static void *packet_previous_frame(struct packet_sock *po,
1181 struct packet_ring_buffer *rb,
1184 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
1185 return packet_lookup_frame(po, rb, previous, status);
1188 static void packet_increment_head(struct packet_ring_buffer *buff)
1190 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
1193 static void packet_inc_pending(struct packet_ring_buffer *rb)
1195 this_cpu_inc(*rb->pending_refcnt);
1198 static void packet_dec_pending(struct packet_ring_buffer *rb)
1200 this_cpu_dec(*rb->pending_refcnt);
1203 static unsigned int packet_read_pending(const struct packet_ring_buffer *rb)
1205 unsigned int refcnt = 0;
1208 /* We don't use pending refcount in rx_ring. */
1209 if (rb->pending_refcnt == NULL)
1212 for_each_possible_cpu(cpu)
1213 refcnt += *per_cpu_ptr(rb->pending_refcnt, cpu);
1218 static int packet_alloc_pending(struct packet_sock *po)
1220 po->rx_ring.pending_refcnt = NULL;
1222 po->tx_ring.pending_refcnt = alloc_percpu(unsigned int);
1223 if (unlikely(po->tx_ring.pending_refcnt == NULL))
1229 static void packet_free_pending(struct packet_sock *po)
1231 free_percpu(po->tx_ring.pending_refcnt);
1234 #define ROOM_POW_OFF 2
1235 #define ROOM_NONE 0x0
1236 #define ROOM_LOW 0x1
1237 #define ROOM_NORMAL 0x2
1239 static bool __tpacket_has_room(struct packet_sock *po, int pow_off)
1243 len = po->rx_ring.frame_max + 1;
1244 idx = po->rx_ring.head;
1246 idx += len >> pow_off;
1249 return packet_lookup_frame(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1252 static bool __tpacket_v3_has_room(struct packet_sock *po, int pow_off)
1256 len = po->rx_ring.prb_bdqc.knum_blocks;
1257 idx = po->rx_ring.prb_bdqc.kactive_blk_num;
1259 idx += len >> pow_off;
1262 return prb_lookup_block(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1265 static int __packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
1267 struct sock *sk = &po->sk;
1268 int ret = ROOM_NONE;
1270 if (po->prot_hook.func != tpacket_rcv) {
1271 int avail = sk->sk_rcvbuf - atomic_read(&sk->sk_rmem_alloc)
1272 - (skb ? skb->truesize : 0);
1273 if (avail > (sk->sk_rcvbuf >> ROOM_POW_OFF))
1281 if (po->tp_version == TPACKET_V3) {
1282 if (__tpacket_v3_has_room(po, ROOM_POW_OFF))
1284 else if (__tpacket_v3_has_room(po, 0))
1287 if (__tpacket_has_room(po, ROOM_POW_OFF))
1289 else if (__tpacket_has_room(po, 0))
1296 static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
1301 spin_lock_bh(&po->sk.sk_receive_queue.lock);
1302 ret = __packet_rcv_has_room(po, skb);
1303 has_room = ret == ROOM_NORMAL;
1304 if (po->pressure == has_room)
1305 po->pressure = !has_room;
1306 spin_unlock_bh(&po->sk.sk_receive_queue.lock);
1311 static void packet_sock_destruct(struct sock *sk)
1313 skb_queue_purge(&sk->sk_error_queue);
1315 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
1316 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
1318 if (!sock_flag(sk, SOCK_DEAD)) {
1319 pr_err("Attempt to release alive packet socket: %p\n", sk);
1323 sk_refcnt_debug_dec(sk);
1326 static bool fanout_flow_is_huge(struct packet_sock *po, struct sk_buff *skb)
1331 rxhash = skb_get_hash(skb);
1332 for (i = 0; i < ROLLOVER_HLEN; i++)
1333 if (po->rollover->history[i] == rxhash)
1336 po->rollover->history[prandom_u32() % ROLLOVER_HLEN] = rxhash;
1337 return count > (ROLLOVER_HLEN >> 1);
1340 static unsigned int fanout_demux_hash(struct packet_fanout *f,
1341 struct sk_buff *skb,
1344 return reciprocal_scale(__skb_get_hash_symmetric(skb), num);
1347 static unsigned int fanout_demux_lb(struct packet_fanout *f,
1348 struct sk_buff *skb,
1351 unsigned int val = atomic_inc_return(&f->rr_cur);
1356 static unsigned int fanout_demux_cpu(struct packet_fanout *f,
1357 struct sk_buff *skb,
1360 return smp_processor_id() % num;
1363 static unsigned int fanout_demux_rnd(struct packet_fanout *f,
1364 struct sk_buff *skb,
1367 return prandom_u32_max(num);
1370 static unsigned int fanout_demux_rollover(struct packet_fanout *f,
1371 struct sk_buff *skb,
1372 unsigned int idx, bool try_self,
1375 struct packet_sock *po, *po_next, *po_skip = NULL;
1376 unsigned int i, j, room = ROOM_NONE;
1378 po = pkt_sk(f->arr[idx]);
1381 room = packet_rcv_has_room(po, skb);
1382 if (room == ROOM_NORMAL ||
1383 (room == ROOM_LOW && !fanout_flow_is_huge(po, skb)))
1388 i = j = min_t(int, po->rollover->sock, num - 1);
1390 po_next = pkt_sk(f->arr[i]);
1391 if (po_next != po_skip && !po_next->pressure &&
1392 packet_rcv_has_room(po_next, skb) == ROOM_NORMAL) {
1394 po->rollover->sock = i;
1395 atomic_long_inc(&po->rollover->num);
1396 if (room == ROOM_LOW)
1397 atomic_long_inc(&po->rollover->num_huge);
1405 atomic_long_inc(&po->rollover->num_failed);
1409 static unsigned int fanout_demux_qm(struct packet_fanout *f,
1410 struct sk_buff *skb,
1413 return skb_get_queue_mapping(skb) % num;
1416 static unsigned int fanout_demux_bpf(struct packet_fanout *f,
1417 struct sk_buff *skb,
1420 struct bpf_prog *prog;
1421 unsigned int ret = 0;
1424 prog = rcu_dereference(f->bpf_prog);
1426 ret = bpf_prog_run_clear_cb(prog, skb) % num;
1432 static bool fanout_has_flag(struct packet_fanout *f, u16 flag)
1434 return f->flags & (flag >> 8);
1437 static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
1438 struct packet_type *pt, struct net_device *orig_dev)
1440 struct packet_fanout *f = pt->af_packet_priv;
1441 unsigned int num = READ_ONCE(f->num_members);
1442 struct net *net = read_pnet(&f->net);
1443 struct packet_sock *po;
1446 if (!net_eq(dev_net(dev), net) || !num) {
1451 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) {
1452 skb = ip_check_defrag(net, skb, IP_DEFRAG_AF_PACKET);
1457 case PACKET_FANOUT_HASH:
1459 idx = fanout_demux_hash(f, skb, num);
1461 case PACKET_FANOUT_LB:
1462 idx = fanout_demux_lb(f, skb, num);
1464 case PACKET_FANOUT_CPU:
1465 idx = fanout_demux_cpu(f, skb, num);
1467 case PACKET_FANOUT_RND:
1468 idx = fanout_demux_rnd(f, skb, num);
1470 case PACKET_FANOUT_QM:
1471 idx = fanout_demux_qm(f, skb, num);
1473 case PACKET_FANOUT_ROLLOVER:
1474 idx = fanout_demux_rollover(f, skb, 0, false, num);
1476 case PACKET_FANOUT_CBPF:
1477 case PACKET_FANOUT_EBPF:
1478 idx = fanout_demux_bpf(f, skb, num);
1482 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER))
1483 idx = fanout_demux_rollover(f, skb, idx, true, num);
1485 po = pkt_sk(f->arr[idx]);
1486 return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
1489 DEFINE_MUTEX(fanout_mutex);
1490 EXPORT_SYMBOL_GPL(fanout_mutex);
1491 static LIST_HEAD(fanout_list);
1493 static void __fanout_link(struct sock *sk, struct packet_sock *po)
1495 struct packet_fanout *f = po->fanout;
1497 spin_lock(&f->lock);
1498 f->arr[f->num_members] = sk;
1501 spin_unlock(&f->lock);
1504 static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
1506 struct packet_fanout *f = po->fanout;
1509 spin_lock(&f->lock);
1510 for (i = 0; i < f->num_members; i++) {
1511 if (f->arr[i] == sk)
1514 BUG_ON(i >= f->num_members);
1515 f->arr[i] = f->arr[f->num_members - 1];
1517 spin_unlock(&f->lock);
1520 static bool match_fanout_group(struct packet_type *ptype, struct sock *sk)
1522 if (sk->sk_family != PF_PACKET)
1525 return ptype->af_packet_priv == pkt_sk(sk)->fanout;
1528 static void fanout_init_data(struct packet_fanout *f)
1531 case PACKET_FANOUT_LB:
1532 atomic_set(&f->rr_cur, 0);
1534 case PACKET_FANOUT_CBPF:
1535 case PACKET_FANOUT_EBPF:
1536 RCU_INIT_POINTER(f->bpf_prog, NULL);
1541 static void __fanout_set_data_bpf(struct packet_fanout *f, struct bpf_prog *new)
1543 struct bpf_prog *old;
1545 spin_lock(&f->lock);
1546 old = rcu_dereference_protected(f->bpf_prog, lockdep_is_held(&f->lock));
1547 rcu_assign_pointer(f->bpf_prog, new);
1548 spin_unlock(&f->lock);
1552 bpf_prog_destroy(old);
1556 static int fanout_set_data_cbpf(struct packet_sock *po, char __user *data,
1559 struct bpf_prog *new;
1560 struct sock_fprog fprog;
1563 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1565 if (len != sizeof(fprog))
1567 if (copy_from_user(&fprog, data, len))
1570 ret = bpf_prog_create_from_user(&new, &fprog, NULL, false);
1574 __fanout_set_data_bpf(po->fanout, new);
1578 static int fanout_set_data_ebpf(struct packet_sock *po, char __user *data,
1581 struct bpf_prog *new;
1584 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1586 if (len != sizeof(fd))
1588 if (copy_from_user(&fd, data, len))
1591 new = bpf_prog_get(fd);
1593 return PTR_ERR(new);
1594 if (new->type != BPF_PROG_TYPE_SOCKET_FILTER) {
1599 __fanout_set_data_bpf(po->fanout, new);
1603 static int fanout_set_data(struct packet_sock *po, char __user *data,
1606 switch (po->fanout->type) {
1607 case PACKET_FANOUT_CBPF:
1608 return fanout_set_data_cbpf(po, data, len);
1609 case PACKET_FANOUT_EBPF:
1610 return fanout_set_data_ebpf(po, data, len);
1616 static void fanout_release_data(struct packet_fanout *f)
1619 case PACKET_FANOUT_CBPF:
1620 case PACKET_FANOUT_EBPF:
1621 __fanout_set_data_bpf(f, NULL);
1625 static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
1627 struct packet_sock *po = pkt_sk(sk);
1628 struct packet_fanout *f, *match;
1629 u8 type = type_flags & 0xff;
1630 u8 flags = type_flags >> 8;
1634 case PACKET_FANOUT_ROLLOVER:
1635 if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)
1637 case PACKET_FANOUT_HASH:
1638 case PACKET_FANOUT_LB:
1639 case PACKET_FANOUT_CPU:
1640 case PACKET_FANOUT_RND:
1641 case PACKET_FANOUT_QM:
1642 case PACKET_FANOUT_CBPF:
1643 case PACKET_FANOUT_EBPF:
1655 if (type == PACKET_FANOUT_ROLLOVER ||
1656 (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) {
1657 po->rollover = kzalloc(sizeof(*po->rollover), GFP_KERNEL);
1660 atomic_long_set(&po->rollover->num, 0);
1661 atomic_long_set(&po->rollover->num_huge, 0);
1662 atomic_long_set(&po->rollover->num_failed, 0);
1665 mutex_lock(&fanout_mutex);
1667 list_for_each_entry(f, &fanout_list, list) {
1669 read_pnet(&f->net) == sock_net(sk)) {
1675 if (match && match->flags != flags)
1679 match = kzalloc(sizeof(*match), GFP_KERNEL);
1682 write_pnet(&match->net, sock_net(sk));
1685 match->flags = flags;
1686 INIT_LIST_HEAD(&match->list);
1687 spin_lock_init(&match->lock);
1688 atomic_set(&match->sk_ref, 0);
1689 fanout_init_data(match);
1690 match->prot_hook.type = po->prot_hook.type;
1691 match->prot_hook.dev = po->prot_hook.dev;
1692 match->prot_hook.func = packet_rcv_fanout;
1693 match->prot_hook.af_packet_priv = match;
1694 match->prot_hook.id_match = match_fanout_group;
1695 dev_add_pack(&match->prot_hook);
1696 list_add(&match->list, &fanout_list);
1699 if (match->type == type &&
1700 match->prot_hook.type == po->prot_hook.type &&
1701 match->prot_hook.dev == po->prot_hook.dev) {
1703 if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
1704 __dev_remove_pack(&po->prot_hook);
1706 atomic_inc(&match->sk_ref);
1707 __fanout_link(sk, po);
1712 mutex_unlock(&fanout_mutex);
1714 kfree(po->rollover);
1715 po->rollover = NULL;
1720 static void fanout_release(struct sock *sk)
1722 struct packet_sock *po = pkt_sk(sk);
1723 struct packet_fanout *f;
1729 mutex_lock(&fanout_mutex);
1732 if (atomic_dec_and_test(&f->sk_ref)) {
1734 dev_remove_pack(&f->prot_hook);
1735 fanout_release_data(f);
1738 mutex_unlock(&fanout_mutex);
1741 kfree_rcu(po->rollover, rcu);
1744 static bool packet_extra_vlan_len_allowed(const struct net_device *dev,
1745 struct sk_buff *skb)
1747 /* Earlier code assumed this would be a VLAN pkt, double-check
1748 * this now that we have the actual packet in hand. We can only
1749 * do this check on Ethernet devices.
1751 if (unlikely(dev->type != ARPHRD_ETHER))
1754 skb_reset_mac_header(skb);
1755 return likely(eth_hdr(skb)->h_proto == htons(ETH_P_8021Q));
1758 static const struct proto_ops packet_ops;
1760 static const struct proto_ops packet_ops_spkt;
1762 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
1763 struct packet_type *pt, struct net_device *orig_dev)
1766 struct sockaddr_pkt *spkt;
1769 * When we registered the protocol we saved the socket in the data
1770 * field for just this event.
1773 sk = pt->af_packet_priv;
1776 * Yank back the headers [hope the device set this
1777 * right or kerboom...]
1779 * Incoming packets have ll header pulled,
1782 * For outgoing ones skb->data == skb_mac_header(skb)
1783 * so that this procedure is noop.
1786 if (skb->pkt_type == PACKET_LOOPBACK)
1789 if (!net_eq(dev_net(dev), sock_net(sk)))
1792 skb = skb_share_check(skb, GFP_ATOMIC);
1796 /* drop any routing info */
1799 /* drop conntrack reference */
1802 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
1804 skb_push(skb, skb->data - skb_mac_header(skb));
1807 * The SOCK_PACKET socket receives _all_ frames.
1810 spkt->spkt_family = dev->type;
1811 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
1812 spkt->spkt_protocol = skb->protocol;
1815 * Charge the memory to the socket. This is done specifically
1816 * to prevent sockets using all the memory up.
1819 if (sock_queue_rcv_skb(sk, skb) == 0)
1830 * Output a raw packet to a device layer. This bypasses all the other
1831 * protocol layers and you must therefore supply it with a complete frame
1834 static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg,
1837 struct sock *sk = sock->sk;
1838 DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name);
1839 struct sk_buff *skb = NULL;
1840 struct net_device *dev;
1841 struct sockcm_cookie sockc;
1847 * Get and verify the address.
1851 if (msg->msg_namelen < sizeof(struct sockaddr))
1853 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
1854 proto = saddr->spkt_protocol;
1856 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
1859 * Find the device first to size check it
1862 saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0;
1865 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
1871 if (!(dev->flags & IFF_UP))
1875 * You may not queue a frame bigger than the mtu. This is the lowest level
1876 * raw protocol and you must do your own fragmentation at this level.
1879 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
1880 if (!netif_supports_nofcs(dev)) {
1881 err = -EPROTONOSUPPORT;
1884 extra_len = 4; /* We're doing our own CRC */
1888 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len)
1892 size_t reserved = LL_RESERVED_SPACE(dev);
1893 int tlen = dev->needed_tailroom;
1894 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
1897 skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL);
1900 /* FIXME: Save some space for broken drivers that write a hard
1901 * header at transmission time by themselves. PPP is the notable
1902 * one here. This should really be fixed at the driver level.
1904 skb_reserve(skb, reserved);
1905 skb_reset_network_header(skb);
1907 /* Try to align data part correctly */
1912 skb_reset_network_header(skb);
1914 err = memcpy_from_msg(skb_put(skb, len), msg, len);
1920 if (!dev_validate_header(dev, skb->data, len)) {
1924 if (len > (dev->mtu + dev->hard_header_len + extra_len) &&
1925 !packet_extra_vlan_len_allowed(dev, skb)) {
1930 sockc.tsflags = sk->sk_tsflags;
1931 if (msg->msg_controllen) {
1932 err = sock_cmsg_send(sk, msg, &sockc);
1937 skb->protocol = proto;
1939 skb->priority = sk->sk_priority;
1940 skb->mark = sk->sk_mark;
1942 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
1944 if (unlikely(extra_len == 4))
1947 skb_probe_transport_header(skb, 0);
1949 dev_queue_xmit(skb);
1960 static unsigned int run_filter(struct sk_buff *skb,
1961 const struct sock *sk,
1964 struct sk_filter *filter;
1967 filter = rcu_dereference(sk->sk_filter);
1969 res = bpf_prog_run_clear_cb(filter->prog, skb);
1975 static int __packet_rcv_vnet(const struct sk_buff *skb,
1976 struct virtio_net_hdr *vnet_hdr)
1978 *vnet_hdr = (const struct virtio_net_hdr) { 0 };
1980 if (skb_is_gso(skb)) {
1981 struct skb_shared_info *sinfo = skb_shinfo(skb);
1983 /* This is a hint as to how much should be linear. */
1985 __cpu_to_virtio16(vio_le(), skb_headlen(skb));
1986 vnet_hdr->gso_size =
1987 __cpu_to_virtio16(vio_le(), sinfo->gso_size);
1989 if (sinfo->gso_type & SKB_GSO_TCPV4)
1990 vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
1991 else if (sinfo->gso_type & SKB_GSO_TCPV6)
1992 vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
1993 else if (sinfo->gso_type & SKB_GSO_UDP)
1994 vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
1995 else if (sinfo->gso_type & SKB_GSO_FCOE)
2000 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
2001 vnet_hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
2003 vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
2005 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2006 vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
2007 vnet_hdr->csum_start = __cpu_to_virtio16(vio_le(),
2008 skb_checksum_start_offset(skb));
2009 vnet_hdr->csum_offset = __cpu_to_virtio16(vio_le(),
2011 } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
2012 vnet_hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID;
2013 } /* else everything is zero */
2018 static int packet_rcv_vnet(struct msghdr *msg, const struct sk_buff *skb,
2021 struct virtio_net_hdr vnet_hdr;
2023 if (*len < sizeof(vnet_hdr))
2025 *len -= sizeof(vnet_hdr);
2027 if (__packet_rcv_vnet(skb, &vnet_hdr))
2030 return memcpy_to_msg(msg, (void *)&vnet_hdr, sizeof(vnet_hdr));
2034 * This function makes lazy skb cloning in hope that most of packets
2035 * are discarded by BPF.
2037 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
2038 * and skb->cb are mangled. It works because (and until) packets
2039 * falling here are owned by current CPU. Output packets are cloned
2040 * by dev_queue_xmit_nit(), input packets are processed by net_bh
2041 * sequencially, so that if we return skb to original state on exit,
2042 * we will not harm anyone.
2045 static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
2046 struct packet_type *pt, struct net_device *orig_dev)
2049 struct sockaddr_ll *sll;
2050 struct packet_sock *po;
2051 u8 *skb_head = skb->data;
2052 int skb_len = skb->len;
2053 unsigned int snaplen, res;
2054 bool is_drop_n_account = false;
2056 if (skb->pkt_type == PACKET_LOOPBACK)
2059 sk = pt->af_packet_priv;
2062 if (!net_eq(dev_net(dev), sock_net(sk)))
2067 if (dev->header_ops) {
2068 /* The device has an explicit notion of ll header,
2069 * exported to higher levels.
2071 * Otherwise, the device hides details of its frame
2072 * structure, so that corresponding packet head is
2073 * never delivered to user.
2075 if (sk->sk_type != SOCK_DGRAM)
2076 skb_push(skb, skb->data - skb_mac_header(skb));
2077 else if (skb->pkt_type == PACKET_OUTGOING) {
2078 /* Special case: outgoing packets have ll header at head */
2079 skb_pull(skb, skb_network_offset(skb));
2085 res = run_filter(skb, sk, snaplen);
2087 goto drop_n_restore;
2091 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
2094 if (skb_shared(skb)) {
2095 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
2099 if (skb_head != skb->data) {
2100 skb->data = skb_head;
2107 sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8);
2109 sll = &PACKET_SKB_CB(skb)->sa.ll;
2110 sll->sll_hatype = dev->type;
2111 sll->sll_pkttype = skb->pkt_type;
2112 if (unlikely(po->origdev))
2113 sll->sll_ifindex = orig_dev->ifindex;
2115 sll->sll_ifindex = dev->ifindex;
2117 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2119 /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg().
2120 * Use their space for storing the original skb length.
2122 PACKET_SKB_CB(skb)->sa.origlen = skb->len;
2124 if (pskb_trim(skb, snaplen))
2127 skb_set_owner_r(skb, sk);
2131 /* drop conntrack reference */
2134 spin_lock(&sk->sk_receive_queue.lock);
2135 po->stats.stats1.tp_packets++;
2136 sock_skb_set_dropcount(sk, skb);
2137 __skb_queue_tail(&sk->sk_receive_queue, skb);
2138 spin_unlock(&sk->sk_receive_queue.lock);
2139 sk->sk_data_ready(sk);
2143 is_drop_n_account = true;
2144 spin_lock(&sk->sk_receive_queue.lock);
2145 po->stats.stats1.tp_drops++;
2146 atomic_inc(&sk->sk_drops);
2147 spin_unlock(&sk->sk_receive_queue.lock);
2150 if (skb_head != skb->data && skb_shared(skb)) {
2151 skb->data = skb_head;
2155 if (!is_drop_n_account)
2162 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
2163 struct packet_type *pt, struct net_device *orig_dev)
2166 struct packet_sock *po;
2167 struct sockaddr_ll *sll;
2168 union tpacket_uhdr h;
2169 u8 *skb_head = skb->data;
2170 int skb_len = skb->len;
2171 unsigned int snaplen, res;
2172 unsigned long status = TP_STATUS_USER;
2173 unsigned short macoff, netoff, hdrlen;
2174 struct sk_buff *copy_skb = NULL;
2177 bool is_drop_n_account = false;
2179 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
2180 * We may add members to them until current aligned size without forcing
2181 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
2183 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
2184 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
2186 if (skb->pkt_type == PACKET_LOOPBACK)
2189 sk = pt->af_packet_priv;
2192 if (!net_eq(dev_net(dev), sock_net(sk)))
2195 if (dev->header_ops) {
2196 if (sk->sk_type != SOCK_DGRAM)
2197 skb_push(skb, skb->data - skb_mac_header(skb));
2198 else if (skb->pkt_type == PACKET_OUTGOING) {
2199 /* Special case: outgoing packets have ll header at head */
2200 skb_pull(skb, skb_network_offset(skb));
2206 res = run_filter(skb, sk, snaplen);
2208 goto drop_n_restore;
2210 if (skb->ip_summed == CHECKSUM_PARTIAL)
2211 status |= TP_STATUS_CSUMNOTREADY;
2212 else if (skb->pkt_type != PACKET_OUTGOING &&
2213 (skb->ip_summed == CHECKSUM_COMPLETE ||
2214 skb_csum_unnecessary(skb)))
2215 status |= TP_STATUS_CSUM_VALID;
2220 if (sk->sk_type == SOCK_DGRAM) {
2221 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
2224 unsigned int maclen = skb_network_offset(skb);
2225 netoff = TPACKET_ALIGN(po->tp_hdrlen +
2226 (maclen < 16 ? 16 : maclen)) +
2228 if (po->has_vnet_hdr)
2229 netoff += sizeof(struct virtio_net_hdr);
2230 macoff = netoff - maclen;
2232 if (po->tp_version <= TPACKET_V2) {
2233 if (macoff + snaplen > po->rx_ring.frame_size) {
2234 if (po->copy_thresh &&
2235 atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
2236 if (skb_shared(skb)) {
2237 copy_skb = skb_clone(skb, GFP_ATOMIC);
2239 copy_skb = skb_get(skb);
2240 skb_head = skb->data;
2243 skb_set_owner_r(copy_skb, sk);
2245 snaplen = po->rx_ring.frame_size - macoff;
2246 if ((int)snaplen < 0)
2249 } else if (unlikely(macoff + snaplen >
2250 GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) {
2253 nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff;
2254 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
2255 snaplen, nval, macoff);
2257 if (unlikely((int)snaplen < 0)) {
2259 macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len;
2262 spin_lock(&sk->sk_receive_queue.lock);
2263 h.raw = packet_current_rx_frame(po, skb,
2264 TP_STATUS_KERNEL, (macoff+snaplen));
2266 goto drop_n_account;
2267 if (po->tp_version <= TPACKET_V2) {
2268 packet_increment_rx_head(po, &po->rx_ring);
2270 * LOSING will be reported till you read the stats,
2271 * because it's COR - Clear On Read.
2272 * Anyways, moving it for V1/V2 only as V3 doesn't need this
2275 if (po->stats.stats1.tp_drops)
2276 status |= TP_STATUS_LOSING;
2278 po->stats.stats1.tp_packets++;
2280 status |= TP_STATUS_COPY;
2281 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
2283 spin_unlock(&sk->sk_receive_queue.lock);
2285 if (po->has_vnet_hdr) {
2286 if (__packet_rcv_vnet(skb, h.raw + macoff -
2287 sizeof(struct virtio_net_hdr))) {
2288 spin_lock(&sk->sk_receive_queue.lock);
2289 goto drop_n_account;
2293 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
2295 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
2296 getnstimeofday(&ts);
2298 status |= ts_status;
2300 switch (po->tp_version) {
2302 h.h1->tp_len = skb->len;
2303 h.h1->tp_snaplen = snaplen;
2304 h.h1->tp_mac = macoff;
2305 h.h1->tp_net = netoff;
2306 h.h1->tp_sec = ts.tv_sec;
2307 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
2308 hdrlen = sizeof(*h.h1);
2311 h.h2->tp_len = skb->len;
2312 h.h2->tp_snaplen = snaplen;
2313 h.h2->tp_mac = macoff;
2314 h.h2->tp_net = netoff;
2315 h.h2->tp_sec = ts.tv_sec;
2316 h.h2->tp_nsec = ts.tv_nsec;
2317 if (skb_vlan_tag_present(skb)) {
2318 h.h2->tp_vlan_tci = skb_vlan_tag_get(skb);
2319 h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto);
2320 status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
2322 h.h2->tp_vlan_tci = 0;
2323 h.h2->tp_vlan_tpid = 0;
2325 memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding));
2326 hdrlen = sizeof(*h.h2);
2329 /* tp_nxt_offset,vlan are already populated above.
2330 * So DONT clear those fields here
2332 h.h3->tp_status |= status;
2333 h.h3->tp_len = skb->len;
2334 h.h3->tp_snaplen = snaplen;
2335 h.h3->tp_mac = macoff;
2336 h.h3->tp_net = netoff;
2337 h.h3->tp_sec = ts.tv_sec;
2338 h.h3->tp_nsec = ts.tv_nsec;
2339 memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding));
2340 hdrlen = sizeof(*h.h3);
2346 sll = h.raw + TPACKET_ALIGN(hdrlen);
2347 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2348 sll->sll_family = AF_PACKET;
2349 sll->sll_hatype = dev->type;
2350 sll->sll_protocol = skb->protocol;
2351 sll->sll_pkttype = skb->pkt_type;
2352 if (unlikely(po->origdev))
2353 sll->sll_ifindex = orig_dev->ifindex;
2355 sll->sll_ifindex = dev->ifindex;
2359 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
2360 if (po->tp_version <= TPACKET_V2) {
2363 end = (u8 *) PAGE_ALIGN((unsigned long) h.raw +
2366 for (start = h.raw; start < end; start += PAGE_SIZE)
2367 flush_dcache_page(pgv_to_page(start));
2372 if (po->tp_version <= TPACKET_V2) {
2373 __packet_set_status(po, h.raw, status);
2374 sk->sk_data_ready(sk);
2376 prb_clear_blk_fill_status(&po->rx_ring);
2380 if (skb_head != skb->data && skb_shared(skb)) {
2381 skb->data = skb_head;
2385 if (!is_drop_n_account)
2392 is_drop_n_account = true;
2393 po->stats.stats1.tp_drops++;
2394 spin_unlock(&sk->sk_receive_queue.lock);
2396 sk->sk_data_ready(sk);
2397 kfree_skb(copy_skb);
2398 goto drop_n_restore;
2401 static void tpacket_destruct_skb(struct sk_buff *skb)
2403 struct packet_sock *po = pkt_sk(skb->sk);
2405 if (likely(po->tx_ring.pg_vec)) {
2409 ph = skb_shinfo(skb)->destructor_arg;
2410 packet_dec_pending(&po->tx_ring);
2412 ts = __packet_set_timestamp(po, ph, skb);
2413 __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts);
2419 static void tpacket_set_protocol(const struct net_device *dev,
2420 struct sk_buff *skb)
2422 if (dev->type == ARPHRD_ETHER) {
2423 skb_reset_mac_header(skb);
2424 skb->protocol = eth_hdr(skb)->h_proto;
2428 static int __packet_snd_vnet_parse(struct virtio_net_hdr *vnet_hdr, size_t len)
2430 unsigned short gso_type = 0;
2432 if ((vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
2433 (__virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2434 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2 >
2435 __virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len)))
2436 vnet_hdr->hdr_len = __cpu_to_virtio16(vio_le(),
2437 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2438 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2);
2440 if (__virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len) > len)
2443 if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2444 switch (vnet_hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2445 case VIRTIO_NET_HDR_GSO_TCPV4:
2446 gso_type = SKB_GSO_TCPV4;
2448 case VIRTIO_NET_HDR_GSO_TCPV6:
2449 gso_type = SKB_GSO_TCPV6;
2451 case VIRTIO_NET_HDR_GSO_UDP:
2452 gso_type = SKB_GSO_UDP;
2458 if (vnet_hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
2459 gso_type |= SKB_GSO_TCP_ECN;
2461 if (vnet_hdr->gso_size == 0)
2465 vnet_hdr->gso_type = gso_type; /* changes type, temporary storage */
2469 static int packet_snd_vnet_parse(struct msghdr *msg, size_t *len,
2470 struct virtio_net_hdr *vnet_hdr)
2474 if (*len < sizeof(*vnet_hdr))
2476 *len -= sizeof(*vnet_hdr);
2478 n = copy_from_iter(vnet_hdr, sizeof(*vnet_hdr), &msg->msg_iter);
2479 if (n != sizeof(*vnet_hdr))
2482 return __packet_snd_vnet_parse(vnet_hdr, *len);
2485 static int packet_snd_vnet_gso(struct sk_buff *skb,
2486 struct virtio_net_hdr *vnet_hdr)
2488 if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
2489 u16 s = __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start);
2490 u16 o = __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset);
2492 if (!skb_partial_csum_set(skb, s, o))
2496 skb_shinfo(skb)->gso_size =
2497 __virtio16_to_cpu(vio_le(), vnet_hdr->gso_size);
2498 skb_shinfo(skb)->gso_type = vnet_hdr->gso_type;
2500 /* Header must be checked, and gso_segs computed. */
2501 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2502 skb_shinfo(skb)->gso_segs = 0;
2506 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
2507 void *frame, struct net_device *dev, void *data, int tp_len,
2508 __be16 proto, unsigned char *addr, int hlen, int copylen,
2509 const struct sockcm_cookie *sockc)
2511 union tpacket_uhdr ph;
2512 int to_write, offset, len, nr_frags, len_max;
2513 struct socket *sock = po->sk.sk_socket;
2519 skb->protocol = proto;
2521 skb->priority = po->sk.sk_priority;
2522 skb->mark = po->sk.sk_mark;
2523 sock_tx_timestamp(&po->sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags);
2524 skb_shinfo(skb)->destructor_arg = ph.raw;
2526 skb_reserve(skb, hlen);
2527 skb_reset_network_header(skb);
2531 if (sock->type == SOCK_DGRAM) {
2532 err = dev_hard_header(skb, dev, ntohs(proto), addr,
2534 if (unlikely(err < 0))
2536 } else if (copylen) {
2537 int hdrlen = min_t(int, copylen, tp_len);
2539 skb_push(skb, dev->hard_header_len);
2540 skb_put(skb, copylen - dev->hard_header_len);
2541 err = skb_store_bits(skb, 0, data, hdrlen);
2544 if (!dev_validate_header(dev, skb->data, hdrlen))
2547 tpacket_set_protocol(dev, skb);
2553 offset = offset_in_page(data);
2554 len_max = PAGE_SIZE - offset;
2555 len = ((to_write > len_max) ? len_max : to_write);
2557 skb->data_len = to_write;
2558 skb->len += to_write;
2559 skb->truesize += to_write;
2560 atomic_add(to_write, &po->sk.sk_wmem_alloc);
2562 while (likely(to_write)) {
2563 nr_frags = skb_shinfo(skb)->nr_frags;
2565 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
2566 pr_err("Packet exceed the number of skb frags(%lu)\n",
2571 page = pgv_to_page(data);
2573 flush_dcache_page(page);
2575 skb_fill_page_desc(skb, nr_frags, page, offset, len);
2578 len_max = PAGE_SIZE;
2579 len = ((to_write > len_max) ? len_max : to_write);
2582 skb_probe_transport_header(skb, 0);
2587 static int tpacket_parse_header(struct packet_sock *po, void *frame,
2588 int size_max, void **data)
2590 union tpacket_uhdr ph;
2595 switch (po->tp_version) {
2597 tp_len = ph.h2->tp_len;
2600 tp_len = ph.h1->tp_len;
2603 if (unlikely(tp_len > size_max)) {
2604 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
2608 if (unlikely(po->tp_tx_has_off)) {
2609 int off_min, off_max;
2611 off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2612 off_max = po->tx_ring.frame_size - tp_len;
2613 if (po->sk.sk_type == SOCK_DGRAM) {
2614 switch (po->tp_version) {
2616 off = ph.h2->tp_net;
2619 off = ph.h1->tp_net;
2623 switch (po->tp_version) {
2625 off = ph.h2->tp_mac;
2628 off = ph.h1->tp_mac;
2632 if (unlikely((off < off_min) || (off_max < off)))
2635 off = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2638 *data = frame + off;
2642 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
2644 struct sk_buff *skb;
2645 struct net_device *dev;
2646 struct virtio_net_hdr *vnet_hdr = NULL;
2647 struct sockcm_cookie sockc;
2649 int err, reserve = 0;
2651 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2652 bool need_wait = !(msg->msg_flags & MSG_DONTWAIT);
2653 int tp_len, size_max;
2654 unsigned char *addr;
2657 int status = TP_STATUS_AVAILABLE;
2658 int hlen, tlen, copylen = 0;
2660 mutex_lock(&po->pg_vec_lock);
2662 if (likely(saddr == NULL)) {
2663 dev = packet_cached_dev_get(po);
2668 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2670 if (msg->msg_namelen < (saddr->sll_halen
2671 + offsetof(struct sockaddr_ll,
2674 proto = saddr->sll_protocol;
2675 addr = saddr->sll_addr;
2676 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
2679 sockc.tsflags = po->sk.sk_tsflags;
2680 if (msg->msg_controllen) {
2681 err = sock_cmsg_send(&po->sk, msg, &sockc);
2687 if (unlikely(dev == NULL))
2690 if (unlikely(!(dev->flags & IFF_UP)))
2693 if (po->sk.sk_socket->type == SOCK_RAW)
2694 reserve = dev->hard_header_len;
2695 size_max = po->tx_ring.frame_size
2696 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
2698 if ((size_max > dev->mtu + reserve + VLAN_HLEN) && !po->has_vnet_hdr)
2699 size_max = dev->mtu + reserve + VLAN_HLEN;
2702 ph = packet_current_frame(po, &po->tx_ring,
2703 TP_STATUS_SEND_REQUEST);
2704 if (unlikely(ph == NULL)) {
2705 if (need_wait && need_resched())
2711 tp_len = tpacket_parse_header(po, ph, size_max, &data);
2715 status = TP_STATUS_SEND_REQUEST;
2716 hlen = LL_RESERVED_SPACE(dev);
2717 tlen = dev->needed_tailroom;
2718 if (po->has_vnet_hdr) {
2720 data += sizeof(*vnet_hdr);
2721 tp_len -= sizeof(*vnet_hdr);
2723 __packet_snd_vnet_parse(vnet_hdr, tp_len)) {
2727 copylen = __virtio16_to_cpu(vio_le(),
2730 copylen = max_t(int, copylen, dev->hard_header_len);
2731 skb = sock_alloc_send_skb(&po->sk,
2732 hlen + tlen + sizeof(struct sockaddr_ll) +
2733 (copylen - dev->hard_header_len),
2736 if (unlikely(skb == NULL)) {
2737 /* we assume the socket was initially writeable ... */
2738 if (likely(len_sum > 0))
2742 tp_len = tpacket_fill_skb(po, skb, ph, dev, data, tp_len, proto,
2743 addr, hlen, copylen, &sockc);
2744 if (likely(tp_len >= 0) &&
2745 tp_len > dev->mtu + reserve &&
2746 !po->has_vnet_hdr &&
2747 !packet_extra_vlan_len_allowed(dev, skb))
2750 if (unlikely(tp_len < 0)) {
2753 __packet_set_status(po, ph,
2754 TP_STATUS_AVAILABLE);
2755 packet_increment_head(&po->tx_ring);
2759 status = TP_STATUS_WRONG_FORMAT;
2765 if (po->has_vnet_hdr && packet_snd_vnet_gso(skb, vnet_hdr)) {
2770 packet_pick_tx_queue(dev, skb);
2772 skb->destructor = tpacket_destruct_skb;
2773 __packet_set_status(po, ph, TP_STATUS_SENDING);
2774 packet_inc_pending(&po->tx_ring);
2776 status = TP_STATUS_SEND_REQUEST;
2777 err = po->xmit(skb);
2778 if (unlikely(err > 0)) {
2779 err = net_xmit_errno(err);
2780 if (err && __packet_get_status(po, ph) ==
2781 TP_STATUS_AVAILABLE) {
2782 /* skb was destructed already */
2787 * skb was dropped but not destructed yet;
2788 * let's treat it like congestion or err < 0
2792 packet_increment_head(&po->tx_ring);
2794 } while (likely((ph != NULL) ||
2795 /* Note: packet_read_pending() might be slow if we have
2796 * to call it as it's per_cpu variable, but in fast-path
2797 * we already short-circuit the loop with the first
2798 * condition, and luckily don't have to go that path
2801 (need_wait && packet_read_pending(&po->tx_ring))));
2807 __packet_set_status(po, ph, status);
2812 mutex_unlock(&po->pg_vec_lock);
2816 static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
2817 size_t reserve, size_t len,
2818 size_t linear, int noblock,
2821 struct sk_buff *skb;
2823 /* Under a page? Don't bother with paged skb. */
2824 if (prepad + len < PAGE_SIZE || !linear)
2827 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
2832 skb_reserve(skb, reserve);
2833 skb_put(skb, linear);
2834 skb->data_len = len - linear;
2835 skb->len += len - linear;
2840 static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
2842 struct sock *sk = sock->sk;
2843 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2844 struct sk_buff *skb;
2845 struct net_device *dev;
2847 unsigned char *addr;
2848 int err, reserve = 0;
2849 struct sockcm_cookie sockc;
2850 struct virtio_net_hdr vnet_hdr = { 0 };
2852 struct packet_sock *po = pkt_sk(sk);
2857 * Get and verify the address.
2860 if (likely(saddr == NULL)) {
2861 dev = packet_cached_dev_get(po);
2866 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2868 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
2870 proto = saddr->sll_protocol;
2871 addr = saddr->sll_addr;
2872 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
2876 if (unlikely(dev == NULL))
2879 if (unlikely(!(dev->flags & IFF_UP)))
2882 sockc.tsflags = sk->sk_tsflags;
2883 sockc.mark = sk->sk_mark;
2884 if (msg->msg_controllen) {
2885 err = sock_cmsg_send(sk, msg, &sockc);
2890 if (sock->type == SOCK_RAW)
2891 reserve = dev->hard_header_len;
2892 if (po->has_vnet_hdr) {
2893 err = packet_snd_vnet_parse(msg, &len, &vnet_hdr);
2898 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
2899 if (!netif_supports_nofcs(dev)) {
2900 err = -EPROTONOSUPPORT;
2903 extra_len = 4; /* We're doing our own CRC */
2907 if (!vnet_hdr.gso_type &&
2908 (len > dev->mtu + reserve + VLAN_HLEN + extra_len))
2912 hlen = LL_RESERVED_SPACE(dev);
2913 tlen = dev->needed_tailroom;
2914 skb = packet_alloc_skb(sk, hlen + tlen, hlen, len,
2915 __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len),
2916 msg->msg_flags & MSG_DONTWAIT, &err);
2920 skb_set_network_header(skb, reserve);
2923 if (sock->type == SOCK_DGRAM) {
2924 offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len);
2925 if (unlikely(offset < 0))
2929 /* Returns -EFAULT on error */
2930 err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len);
2934 if (sock->type == SOCK_RAW &&
2935 !dev_validate_header(dev, skb->data, len)) {
2940 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
2942 if (!vnet_hdr.gso_type && (len > dev->mtu + reserve + extra_len) &&
2943 !packet_extra_vlan_len_allowed(dev, skb)) {
2948 skb->protocol = proto;
2950 skb->priority = sk->sk_priority;
2951 skb->mark = sockc.mark;
2953 packet_pick_tx_queue(dev, skb);
2955 if (po->has_vnet_hdr) {
2956 err = packet_snd_vnet_gso(skb, &vnet_hdr);
2959 len += sizeof(vnet_hdr);
2962 skb_probe_transport_header(skb, reserve);
2964 if (unlikely(extra_len == 4))
2967 err = po->xmit(skb);
2968 if (err > 0 && (err = net_xmit_errno(err)) != 0)
2984 static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2986 struct sock *sk = sock->sk;
2987 struct packet_sock *po = pkt_sk(sk);
2989 if (po->tx_ring.pg_vec)
2990 return tpacket_snd(po, msg);
2992 return packet_snd(sock, msg, len);
2996 * Close a PACKET socket. This is fairly simple. We immediately go
2997 * to 'closed' state and remove our protocol entry in the device list.
3000 static int packet_release(struct socket *sock)
3002 struct sock *sk = sock->sk;
3003 struct packet_sock *po;
3005 union tpacket_req_u req_u;
3013 mutex_lock(&net->packet.sklist_lock);
3014 sk_del_node_init_rcu(sk);
3015 mutex_unlock(&net->packet.sklist_lock);
3018 sock_prot_inuse_add(net, sk->sk_prot, -1);
3021 spin_lock(&po->bind_lock);
3022 unregister_prot_hook(sk, false);
3023 packet_cached_dev_reset(po);
3025 if (po->prot_hook.dev) {
3026 dev_put(po->prot_hook.dev);
3027 po->prot_hook.dev = NULL;
3029 spin_unlock(&po->bind_lock);
3031 packet_flush_mclist(sk);
3033 if (po->rx_ring.pg_vec) {
3034 memset(&req_u, 0, sizeof(req_u));
3035 packet_set_ring(sk, &req_u, 1, 0);
3038 if (po->tx_ring.pg_vec) {
3039 memset(&req_u, 0, sizeof(req_u));
3040 packet_set_ring(sk, &req_u, 1, 1);
3047 * Now the socket is dead. No more input will appear.
3054 skb_queue_purge(&sk->sk_receive_queue);
3055 packet_free_pending(po);
3056 sk_refcnt_debug_release(sk);
3063 * Attach a packet hook.
3066 static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
3069 struct packet_sock *po = pkt_sk(sk);
3070 struct net_device *dev_curr;
3073 struct net_device *dev = NULL;
3075 bool unlisted = false;
3081 spin_lock(&po->bind_lock);
3085 dev = dev_get_by_name_rcu(sock_net(sk), name);
3090 } else if (ifindex) {
3091 dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
3101 proto_curr = po->prot_hook.type;
3102 dev_curr = po->prot_hook.dev;
3104 need_rehook = proto_curr != proto || dev_curr != dev;
3109 __unregister_prot_hook(sk, true);
3111 dev_curr = po->prot_hook.dev;
3113 unlisted = !dev_get_by_index_rcu(sock_net(sk),
3118 po->prot_hook.type = proto;
3120 if (unlikely(unlisted)) {
3122 po->prot_hook.dev = NULL;
3124 packet_cached_dev_reset(po);
3126 po->prot_hook.dev = dev;
3127 po->ifindex = dev ? dev->ifindex : 0;
3128 packet_cached_dev_assign(po, dev);
3134 if (proto == 0 || !need_rehook)
3137 if (!unlisted && (!dev || (dev->flags & IFF_UP))) {
3138 register_prot_hook(sk);
3140 sk->sk_err = ENETDOWN;
3141 if (!sock_flag(sk, SOCK_DEAD))
3142 sk->sk_error_report(sk);
3147 spin_unlock(&po->bind_lock);
3153 * Bind a packet socket to a device
3156 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
3159 struct sock *sk = sock->sk;
3166 if (addr_len != sizeof(struct sockaddr))
3168 strlcpy(name, uaddr->sa_data, sizeof(name));
3170 return packet_do_bind(sk, name, 0, pkt_sk(sk)->num);
3173 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
3175 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
3176 struct sock *sk = sock->sk;
3182 if (addr_len < sizeof(struct sockaddr_ll))
3184 if (sll->sll_family != AF_PACKET)
3187 return packet_do_bind(sk, NULL, sll->sll_ifindex,
3188 sll->sll_protocol ? : pkt_sk(sk)->num);
3191 static struct proto packet_proto = {
3193 .owner = THIS_MODULE,
3194 .obj_size = sizeof(struct packet_sock),
3198 * Create a packet of type SOCK_PACKET.
3201 static int packet_create(struct net *net, struct socket *sock, int protocol,
3205 struct packet_sock *po;
3206 __be16 proto = (__force __be16)protocol; /* weird, but documented */
3209 if (!ns_capable(net->user_ns, CAP_NET_RAW))
3211 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
3212 sock->type != SOCK_PACKET)
3213 return -ESOCKTNOSUPPORT;
3215 sock->state = SS_UNCONNECTED;
3218 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto, kern);
3222 sock->ops = &packet_ops;
3223 if (sock->type == SOCK_PACKET)
3224 sock->ops = &packet_ops_spkt;
3226 sock_init_data(sock, sk);
3229 sk->sk_family = PF_PACKET;
3231 po->xmit = dev_queue_xmit;
3233 err = packet_alloc_pending(po);
3237 packet_cached_dev_reset(po);
3239 sk->sk_destruct = packet_sock_destruct;
3240 sk_refcnt_debug_inc(sk);
3243 * Attach a protocol block
3246 spin_lock_init(&po->bind_lock);
3247 mutex_init(&po->pg_vec_lock);
3248 po->rollover = NULL;
3249 po->prot_hook.func = packet_rcv;
3251 if (sock->type == SOCK_PACKET)
3252 po->prot_hook.func = packet_rcv_spkt;
3254 po->prot_hook.af_packet_priv = sk;
3257 po->prot_hook.type = proto;
3258 register_prot_hook(sk);
3261 mutex_lock(&net->packet.sklist_lock);
3262 sk_add_node_rcu(sk, &net->packet.sklist);
3263 mutex_unlock(&net->packet.sklist_lock);
3266 sock_prot_inuse_add(net, &packet_proto, 1);
3277 * Pull a packet from our receive queue and hand it to the user.
3278 * If necessary we block.
3281 static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3284 struct sock *sk = sock->sk;
3285 struct sk_buff *skb;
3287 int vnet_hdr_len = 0;
3288 unsigned int origlen = 0;
3291 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
3295 /* What error should we return now? EUNATTACH? */
3296 if (pkt_sk(sk)->ifindex < 0)
3300 if (flags & MSG_ERRQUEUE) {
3301 err = sock_recv_errqueue(sk, msg, len,
3302 SOL_PACKET, PACKET_TX_TIMESTAMP);
3307 * Call the generic datagram receiver. This handles all sorts
3308 * of horrible races and re-entrancy so we can forget about it
3309 * in the protocol layers.
3311 * Now it will return ENETDOWN, if device have just gone down,
3312 * but then it will block.
3315 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3318 * An error occurred so return it. Because skb_recv_datagram()
3319 * handles the blocking we don't see and worry about blocking
3326 if (pkt_sk(sk)->pressure)
3327 packet_rcv_has_room(pkt_sk(sk), NULL);
3329 if (pkt_sk(sk)->has_vnet_hdr) {
3330 err = packet_rcv_vnet(msg, skb, &len);
3333 vnet_hdr_len = sizeof(struct virtio_net_hdr);
3336 /* You lose any data beyond the buffer you gave. If it worries
3337 * a user program they can ask the device for its MTU
3343 msg->msg_flags |= MSG_TRUNC;
3346 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3350 if (sock->type != SOCK_PACKET) {
3351 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3353 /* Original length was stored in sockaddr_ll fields */
3354 origlen = PACKET_SKB_CB(skb)->sa.origlen;
3355 sll->sll_family = AF_PACKET;
3356 sll->sll_protocol = skb->protocol;
3359 sock_recv_ts_and_drops(msg, sk, skb);
3361 if (msg->msg_name) {
3362 /* If the address length field is there to be filled
3363 * in, we fill it in now.
3365 if (sock->type == SOCK_PACKET) {
3366 __sockaddr_check_size(sizeof(struct sockaddr_pkt));
3367 msg->msg_namelen = sizeof(struct sockaddr_pkt);
3369 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3371 msg->msg_namelen = sll->sll_halen +
3372 offsetof(struct sockaddr_ll, sll_addr);
3374 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
3378 if (pkt_sk(sk)->auxdata) {
3379 struct tpacket_auxdata aux;
3381 aux.tp_status = TP_STATUS_USER;
3382 if (skb->ip_summed == CHECKSUM_PARTIAL)
3383 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
3384 else if (skb->pkt_type != PACKET_OUTGOING &&
3385 (skb->ip_summed == CHECKSUM_COMPLETE ||
3386 skb_csum_unnecessary(skb)))
3387 aux.tp_status |= TP_STATUS_CSUM_VALID;
3389 aux.tp_len = origlen;
3390 aux.tp_snaplen = skb->len;
3392 aux.tp_net = skb_network_offset(skb);
3393 if (skb_vlan_tag_present(skb)) {
3394 aux.tp_vlan_tci = skb_vlan_tag_get(skb);
3395 aux.tp_vlan_tpid = ntohs(skb->vlan_proto);
3396 aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
3398 aux.tp_vlan_tci = 0;
3399 aux.tp_vlan_tpid = 0;
3401 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
3405 * Free or return the buffer as appropriate. Again this
3406 * hides all the races and re-entrancy issues from us.
3408 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
3411 skb_free_datagram(sk, skb);
3416 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
3417 int *uaddr_len, int peer)
3419 struct net_device *dev;
3420 struct sock *sk = sock->sk;
3425 uaddr->sa_family = AF_PACKET;
3426 memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
3428 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
3430 strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
3432 *uaddr_len = sizeof(*uaddr);
3437 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
3438 int *uaddr_len, int peer)
3440 struct net_device *dev;
3441 struct sock *sk = sock->sk;
3442 struct packet_sock *po = pkt_sk(sk);
3443 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
3448 sll->sll_family = AF_PACKET;
3449 sll->sll_ifindex = po->ifindex;
3450 sll->sll_protocol = po->num;
3451 sll->sll_pkttype = 0;
3453 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
3455 sll->sll_hatype = dev->type;
3456 sll->sll_halen = dev->addr_len;
3457 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
3459 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
3463 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
3468 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
3472 case PACKET_MR_MULTICAST:
3473 if (i->alen != dev->addr_len)
3476 return dev_mc_add(dev, i->addr);
3478 return dev_mc_del(dev, i->addr);
3480 case PACKET_MR_PROMISC:
3481 return dev_set_promiscuity(dev, what);
3482 case PACKET_MR_ALLMULTI:
3483 return dev_set_allmulti(dev, what);
3484 case PACKET_MR_UNICAST:
3485 if (i->alen != dev->addr_len)
3488 return dev_uc_add(dev, i->addr);
3490 return dev_uc_del(dev, i->addr);
3498 static void packet_dev_mclist_delete(struct net_device *dev,
3499 struct packet_mclist **mlp)
3501 struct packet_mclist *ml;
3503 while ((ml = *mlp) != NULL) {
3504 if (ml->ifindex == dev->ifindex) {
3505 packet_dev_mc(dev, ml, -1);
3513 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
3515 struct packet_sock *po = pkt_sk(sk);
3516 struct packet_mclist *ml, *i;
3517 struct net_device *dev;
3523 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
3528 if (mreq->mr_alen > dev->addr_len)
3532 i = kmalloc(sizeof(*i), GFP_KERNEL);
3537 for (ml = po->mclist; ml; ml = ml->next) {
3538 if (ml->ifindex == mreq->mr_ifindex &&
3539 ml->type == mreq->mr_type &&
3540 ml->alen == mreq->mr_alen &&
3541 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3543 /* Free the new element ... */
3549 i->type = mreq->mr_type;
3550 i->ifindex = mreq->mr_ifindex;
3551 i->alen = mreq->mr_alen;
3552 memcpy(i->addr, mreq->mr_address, i->alen);
3553 memset(i->addr + i->alen, 0, sizeof(i->addr) - i->alen);
3555 i->next = po->mclist;
3557 err = packet_dev_mc(dev, i, 1);
3559 po->mclist = i->next;
3568 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
3570 struct packet_mclist *ml, **mlp;
3574 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
3575 if (ml->ifindex == mreq->mr_ifindex &&
3576 ml->type == mreq->mr_type &&
3577 ml->alen == mreq->mr_alen &&
3578 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3579 if (--ml->count == 0) {
3580 struct net_device *dev;
3582 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3584 packet_dev_mc(dev, ml, -1);
3594 static void packet_flush_mclist(struct sock *sk)
3596 struct packet_sock *po = pkt_sk(sk);
3597 struct packet_mclist *ml;
3603 while ((ml = po->mclist) != NULL) {
3604 struct net_device *dev;
3606 po->mclist = ml->next;
3607 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3609 packet_dev_mc(dev, ml, -1);
3616 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
3618 struct sock *sk = sock->sk;
3619 struct packet_sock *po = pkt_sk(sk);
3622 if (level != SOL_PACKET)
3623 return -ENOPROTOOPT;
3626 case PACKET_ADD_MEMBERSHIP:
3627 case PACKET_DROP_MEMBERSHIP:
3629 struct packet_mreq_max mreq;
3631 memset(&mreq, 0, sizeof(mreq));
3632 if (len < sizeof(struct packet_mreq))
3634 if (len > sizeof(mreq))
3636 if (copy_from_user(&mreq, optval, len))
3638 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
3640 if (optname == PACKET_ADD_MEMBERSHIP)
3641 ret = packet_mc_add(sk, &mreq);
3643 ret = packet_mc_drop(sk, &mreq);
3647 case PACKET_RX_RING:
3648 case PACKET_TX_RING:
3650 union tpacket_req_u req_u;
3653 switch (po->tp_version) {
3656 len = sizeof(req_u.req);
3660 len = sizeof(req_u.req3);
3665 if (copy_from_user(&req_u.req, optval, len))
3667 return packet_set_ring(sk, &req_u, 0,
3668 optname == PACKET_TX_RING);
3670 case PACKET_COPY_THRESH:
3674 if (optlen != sizeof(val))
3676 if (copy_from_user(&val, optval, sizeof(val)))
3679 pkt_sk(sk)->copy_thresh = val;
3682 case PACKET_VERSION:
3686 if (optlen != sizeof(val))
3688 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3690 if (copy_from_user(&val, optval, sizeof(val)))
3696 po->tp_version = val;
3702 case PACKET_RESERVE:
3706 if (optlen != sizeof(val))
3708 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3710 if (copy_from_user(&val, optval, sizeof(val)))
3712 po->tp_reserve = val;
3719 if (optlen != sizeof(val))
3721 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3723 if (copy_from_user(&val, optval, sizeof(val)))
3725 po->tp_loss = !!val;
3728 case PACKET_AUXDATA:
3732 if (optlen < sizeof(val))
3734 if (copy_from_user(&val, optval, sizeof(val)))
3737 po->auxdata = !!val;
3740 case PACKET_ORIGDEV:
3744 if (optlen < sizeof(val))
3746 if (copy_from_user(&val, optval, sizeof(val)))
3749 po->origdev = !!val;
3752 case PACKET_VNET_HDR:
3756 if (sock->type != SOCK_RAW)
3758 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3760 if (optlen < sizeof(val))
3762 if (copy_from_user(&val, optval, sizeof(val)))
3765 po->has_vnet_hdr = !!val;
3768 case PACKET_TIMESTAMP:
3772 if (optlen != sizeof(val))
3774 if (copy_from_user(&val, optval, sizeof(val)))
3777 po->tp_tstamp = val;
3784 if (optlen != sizeof(val))
3786 if (copy_from_user(&val, optval, sizeof(val)))
3789 return fanout_add(sk, val & 0xffff, val >> 16);
3791 case PACKET_FANOUT_DATA:
3796 return fanout_set_data(po, optval, optlen);
3798 case PACKET_TX_HAS_OFF:
3802 if (optlen != sizeof(val))
3804 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3806 if (copy_from_user(&val, optval, sizeof(val)))
3808 po->tp_tx_has_off = !!val;
3811 case PACKET_QDISC_BYPASS:
3815 if (optlen != sizeof(val))
3817 if (copy_from_user(&val, optval, sizeof(val)))
3820 po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
3824 return -ENOPROTOOPT;
3828 static int packet_getsockopt(struct socket *sock, int level, int optname,
3829 char __user *optval, int __user *optlen)
3832 int val, lv = sizeof(val);
3833 struct sock *sk = sock->sk;
3834 struct packet_sock *po = pkt_sk(sk);
3836 union tpacket_stats_u st;
3837 struct tpacket_rollover_stats rstats;
3839 if (level != SOL_PACKET)
3840 return -ENOPROTOOPT;
3842 if (get_user(len, optlen))
3849 case PACKET_STATISTICS:
3850 spin_lock_bh(&sk->sk_receive_queue.lock);
3851 memcpy(&st, &po->stats, sizeof(st));
3852 memset(&po->stats, 0, sizeof(po->stats));
3853 spin_unlock_bh(&sk->sk_receive_queue.lock);
3855 if (po->tp_version == TPACKET_V3) {
3856 lv = sizeof(struct tpacket_stats_v3);
3857 st.stats3.tp_packets += st.stats3.tp_drops;
3860 lv = sizeof(struct tpacket_stats);
3861 st.stats1.tp_packets += st.stats1.tp_drops;
3866 case PACKET_AUXDATA:
3869 case PACKET_ORIGDEV:
3872 case PACKET_VNET_HDR:
3873 val = po->has_vnet_hdr;
3875 case PACKET_VERSION:
3876 val = po->tp_version;
3879 if (len > sizeof(int))
3881 if (copy_from_user(&val, optval, len))
3885 val = sizeof(struct tpacket_hdr);
3888 val = sizeof(struct tpacket2_hdr);
3891 val = sizeof(struct tpacket3_hdr);
3897 case PACKET_RESERVE:
3898 val = po->tp_reserve;
3903 case PACKET_TIMESTAMP:
3904 val = po->tp_tstamp;
3908 ((u32)po->fanout->id |
3909 ((u32)po->fanout->type << 16) |
3910 ((u32)po->fanout->flags << 24)) :
3913 case PACKET_ROLLOVER_STATS:
3916 rstats.tp_all = atomic_long_read(&po->rollover->num);
3917 rstats.tp_huge = atomic_long_read(&po->rollover->num_huge);
3918 rstats.tp_failed = atomic_long_read(&po->rollover->num_failed);
3920 lv = sizeof(rstats);
3922 case PACKET_TX_HAS_OFF:
3923 val = po->tp_tx_has_off;
3925 case PACKET_QDISC_BYPASS:
3926 val = packet_use_direct_xmit(po);
3929 return -ENOPROTOOPT;
3934 if (put_user(len, optlen))
3936 if (copy_to_user(optval, data, len))
3942 #ifdef CONFIG_COMPAT
3943 static int compat_packet_setsockopt(struct socket *sock, int level, int optname,
3944 char __user *optval, unsigned int optlen)
3946 struct packet_sock *po = pkt_sk(sock->sk);
3948 if (level != SOL_PACKET)
3949 return -ENOPROTOOPT;
3951 if (optname == PACKET_FANOUT_DATA &&
3952 po->fanout && po->fanout->type == PACKET_FANOUT_CBPF) {
3953 optval = (char __user *)get_compat_bpf_fprog(optval);
3956 optlen = sizeof(struct sock_fprog);
3959 return packet_setsockopt(sock, level, optname, optval, optlen);
3963 static int packet_notifier(struct notifier_block *this,
3964 unsigned long msg, void *ptr)
3967 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3968 struct net *net = dev_net(dev);
3971 sk_for_each_rcu(sk, &net->packet.sklist) {
3972 struct packet_sock *po = pkt_sk(sk);
3975 case NETDEV_UNREGISTER:
3977 packet_dev_mclist_delete(dev, &po->mclist);
3981 if (dev->ifindex == po->ifindex) {
3982 spin_lock(&po->bind_lock);
3984 __unregister_prot_hook(sk, false);
3985 sk->sk_err = ENETDOWN;
3986 if (!sock_flag(sk, SOCK_DEAD))
3987 sk->sk_error_report(sk);
3989 if (msg == NETDEV_UNREGISTER) {
3990 packet_cached_dev_reset(po);
3992 if (po->prot_hook.dev)
3993 dev_put(po->prot_hook.dev);
3994 po->prot_hook.dev = NULL;
3996 spin_unlock(&po->bind_lock);
4000 if (dev->ifindex == po->ifindex) {
4001 spin_lock(&po->bind_lock);
4003 register_prot_hook(sk);
4004 spin_unlock(&po->bind_lock);
4014 static int packet_ioctl(struct socket *sock, unsigned int cmd,
4017 struct sock *sk = sock->sk;
4022 int amount = sk_wmem_alloc_get(sk);
4024 return put_user(amount, (int __user *)arg);
4028 struct sk_buff *skb;
4031 spin_lock_bh(&sk->sk_receive_queue.lock);
4032 skb = skb_peek(&sk->sk_receive_queue);
4035 spin_unlock_bh(&sk->sk_receive_queue.lock);
4036 return put_user(amount, (int __user *)arg);
4039 return sock_get_timestamp(sk, (struct timeval __user *)arg);
4041 return sock_get_timestampns(sk, (struct timespec __user *)arg);
4051 case SIOCGIFBRDADDR:
4052 case SIOCSIFBRDADDR:
4053 case SIOCGIFNETMASK:
4054 case SIOCSIFNETMASK:
4055 case SIOCGIFDSTADDR:
4056 case SIOCSIFDSTADDR:
4058 return inet_dgram_ops.ioctl(sock, cmd, arg);
4062 return -ENOIOCTLCMD;
4067 static unsigned int packet_poll(struct file *file, struct socket *sock,
4070 struct sock *sk = sock->sk;
4071 struct packet_sock *po = pkt_sk(sk);
4072 unsigned int mask = datagram_poll(file, sock, wait);
4074 spin_lock_bh(&sk->sk_receive_queue.lock);
4075 if (po->rx_ring.pg_vec) {
4076 if (!packet_previous_rx_frame(po, &po->rx_ring,
4078 mask |= POLLIN | POLLRDNORM;
4080 if (po->pressure && __packet_rcv_has_room(po, NULL) == ROOM_NORMAL)
4082 spin_unlock_bh(&sk->sk_receive_queue.lock);
4083 spin_lock_bh(&sk->sk_write_queue.lock);
4084 if (po->tx_ring.pg_vec) {
4085 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
4086 mask |= POLLOUT | POLLWRNORM;
4088 spin_unlock_bh(&sk->sk_write_queue.lock);
4093 /* Dirty? Well, I still did not learn better way to account
4097 static void packet_mm_open(struct vm_area_struct *vma)
4099 struct file *file = vma->vm_file;
4100 struct socket *sock = file->private_data;
4101 struct sock *sk = sock->sk;
4104 atomic_inc(&pkt_sk(sk)->mapped);
4107 static void packet_mm_close(struct vm_area_struct *vma)
4109 struct file *file = vma->vm_file;
4110 struct socket *sock = file->private_data;
4111 struct sock *sk = sock->sk;
4114 atomic_dec(&pkt_sk(sk)->mapped);
4117 static const struct vm_operations_struct packet_mmap_ops = {
4118 .open = packet_mm_open,
4119 .close = packet_mm_close,
4122 static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
4127 for (i = 0; i < len; i++) {
4128 if (likely(pg_vec[i].buffer)) {
4129 if (is_vmalloc_addr(pg_vec[i].buffer))
4130 vfree(pg_vec[i].buffer);
4132 free_pages((unsigned long)pg_vec[i].buffer,
4134 pg_vec[i].buffer = NULL;
4140 static char *alloc_one_pg_vec_page(unsigned long order)
4143 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
4144 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
4146 buffer = (char *) __get_free_pages(gfp_flags, order);
4150 /* __get_free_pages failed, fall back to vmalloc */
4151 buffer = vzalloc((1 << order) * PAGE_SIZE);
4155 /* vmalloc failed, lets dig into swap here */
4156 gfp_flags &= ~__GFP_NORETRY;
4157 buffer = (char *) __get_free_pages(gfp_flags, order);
4161 /* complete and utter failure */
4165 static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
4167 unsigned int block_nr = req->tp_block_nr;
4171 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
4172 if (unlikely(!pg_vec))
4175 for (i = 0; i < block_nr; i++) {
4176 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
4177 if (unlikely(!pg_vec[i].buffer))
4178 goto out_free_pgvec;
4185 free_pg_vec(pg_vec, order, block_nr);
4190 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
4191 int closing, int tx_ring)
4193 struct pgv *pg_vec = NULL;
4194 struct packet_sock *po = pkt_sk(sk);
4195 int was_running, order = 0;
4196 struct packet_ring_buffer *rb;
4197 struct sk_buff_head *rb_queue;
4200 /* Added to avoid minimal code churn */
4201 struct tpacket_req *req = &req_u->req;
4203 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
4204 if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) {
4205 net_warn_ratelimited("Tx-ring is not supported.\n");
4209 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
4210 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
4214 if (atomic_read(&po->mapped))
4216 if (packet_read_pending(rb))
4220 if (req->tp_block_nr) {
4221 /* Sanity tests and some calculations */
4223 if (unlikely(rb->pg_vec))
4226 switch (po->tp_version) {
4228 po->tp_hdrlen = TPACKET_HDRLEN;
4231 po->tp_hdrlen = TPACKET2_HDRLEN;
4234 po->tp_hdrlen = TPACKET3_HDRLEN;
4239 if (unlikely((int)req->tp_block_size <= 0))
4241 if (unlikely(!PAGE_ALIGNED(req->tp_block_size)))
4243 if (po->tp_version >= TPACKET_V3 &&
4244 (int)(req->tp_block_size -
4245 BLK_PLUS_PRIV(req_u->req3.tp_sizeof_priv)) <= 0)
4247 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
4250 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
4253 rb->frames_per_block = req->tp_block_size / req->tp_frame_size;
4254 if (unlikely(rb->frames_per_block == 0))
4256 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
4261 order = get_order(req->tp_block_size);
4262 pg_vec = alloc_pg_vec(req, order);
4263 if (unlikely(!pg_vec))
4265 switch (po->tp_version) {
4267 /* Transmit path is not supported. We checked
4268 * it above but just being paranoid
4271 init_prb_bdqc(po, rb, pg_vec, req_u);
4280 if (unlikely(req->tp_frame_nr))
4286 /* Detach socket from network */
4287 spin_lock(&po->bind_lock);
4288 was_running = po->running;
4292 __unregister_prot_hook(sk, false);
4294 spin_unlock(&po->bind_lock);
4299 mutex_lock(&po->pg_vec_lock);
4300 if (closing || atomic_read(&po->mapped) == 0) {
4302 spin_lock_bh(&rb_queue->lock);
4303 swap(rb->pg_vec, pg_vec);
4304 rb->frame_max = (req->tp_frame_nr - 1);
4306 rb->frame_size = req->tp_frame_size;
4307 spin_unlock_bh(&rb_queue->lock);
4309 swap(rb->pg_vec_order, order);
4310 swap(rb->pg_vec_len, req->tp_block_nr);
4312 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
4313 po->prot_hook.func = (po->rx_ring.pg_vec) ?
4314 tpacket_rcv : packet_rcv;
4315 skb_queue_purge(rb_queue);
4316 if (atomic_read(&po->mapped))
4317 pr_err("packet_mmap: vma is busy: %d\n",
4318 atomic_read(&po->mapped));
4320 mutex_unlock(&po->pg_vec_lock);
4322 spin_lock(&po->bind_lock);
4325 register_prot_hook(sk);
4327 spin_unlock(&po->bind_lock);
4328 if (closing && (po->tp_version > TPACKET_V2)) {
4329 /* Because we don't support block-based V3 on tx-ring */
4331 prb_shutdown_retire_blk_timer(po, rb_queue);
4336 free_pg_vec(pg_vec, order, req->tp_block_nr);
4341 static int packet_mmap(struct file *file, struct socket *sock,
4342 struct vm_area_struct *vma)
4344 struct sock *sk = sock->sk;
4345 struct packet_sock *po = pkt_sk(sk);
4346 unsigned long size, expected_size;
4347 struct packet_ring_buffer *rb;
4348 unsigned long start;
4355 mutex_lock(&po->pg_vec_lock);
4358 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4360 expected_size += rb->pg_vec_len
4366 if (expected_size == 0)
4369 size = vma->vm_end - vma->vm_start;
4370 if (size != expected_size)
4373 start = vma->vm_start;
4374 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4375 if (rb->pg_vec == NULL)
4378 for (i = 0; i < rb->pg_vec_len; i++) {
4380 void *kaddr = rb->pg_vec[i].buffer;
4383 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
4384 page = pgv_to_page(kaddr);
4385 err = vm_insert_page(vma, start, page);
4394 atomic_inc(&po->mapped);
4395 vma->vm_ops = &packet_mmap_ops;
4399 mutex_unlock(&po->pg_vec_lock);
4403 static const struct proto_ops packet_ops_spkt = {
4404 .family = PF_PACKET,
4405 .owner = THIS_MODULE,
4406 .release = packet_release,
4407 .bind = packet_bind_spkt,
4408 .connect = sock_no_connect,
4409 .socketpair = sock_no_socketpair,
4410 .accept = sock_no_accept,
4411 .getname = packet_getname_spkt,
4412 .poll = datagram_poll,
4413 .ioctl = packet_ioctl,
4414 .listen = sock_no_listen,
4415 .shutdown = sock_no_shutdown,
4416 .setsockopt = sock_no_setsockopt,
4417 .getsockopt = sock_no_getsockopt,
4418 .sendmsg = packet_sendmsg_spkt,
4419 .recvmsg = packet_recvmsg,
4420 .mmap = sock_no_mmap,
4421 .sendpage = sock_no_sendpage,
4424 static const struct proto_ops packet_ops = {
4425 .family = PF_PACKET,
4426 .owner = THIS_MODULE,
4427 .release = packet_release,
4428 .bind = packet_bind,
4429 .connect = sock_no_connect,
4430 .socketpair = sock_no_socketpair,
4431 .accept = sock_no_accept,
4432 .getname = packet_getname,
4433 .poll = packet_poll,
4434 .ioctl = packet_ioctl,
4435 .listen = sock_no_listen,
4436 .shutdown = sock_no_shutdown,
4437 .setsockopt = packet_setsockopt,
4438 .getsockopt = packet_getsockopt,
4439 #ifdef CONFIG_COMPAT
4440 .compat_setsockopt = compat_packet_setsockopt,
4442 .sendmsg = packet_sendmsg,
4443 .recvmsg = packet_recvmsg,
4444 .mmap = packet_mmap,
4445 .sendpage = sock_no_sendpage,
4448 static const struct net_proto_family packet_family_ops = {
4449 .family = PF_PACKET,
4450 .create = packet_create,
4451 .owner = THIS_MODULE,
4454 static struct notifier_block packet_netdev_notifier = {
4455 .notifier_call = packet_notifier,
4458 #ifdef CONFIG_PROC_FS
4460 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
4463 struct net *net = seq_file_net(seq);
4466 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
4469 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4471 struct net *net = seq_file_net(seq);
4472 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
4475 static void packet_seq_stop(struct seq_file *seq, void *v)
4481 static int packet_seq_show(struct seq_file *seq, void *v)
4483 if (v == SEQ_START_TOKEN)
4484 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4486 struct sock *s = sk_entry(v);
4487 const struct packet_sock *po = pkt_sk(s);
4490 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
4492 atomic_read(&s->sk_refcnt),
4497 atomic_read(&s->sk_rmem_alloc),
4498 from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)),
4505 static const struct seq_operations packet_seq_ops = {
4506 .start = packet_seq_start,
4507 .next = packet_seq_next,
4508 .stop = packet_seq_stop,
4509 .show = packet_seq_show,
4512 static int packet_seq_open(struct inode *inode, struct file *file)
4514 return seq_open_net(inode, file, &packet_seq_ops,
4515 sizeof(struct seq_net_private));
4518 static const struct file_operations packet_seq_fops = {
4519 .owner = THIS_MODULE,
4520 .open = packet_seq_open,
4522 .llseek = seq_lseek,
4523 .release = seq_release_net,
4528 static int __net_init packet_net_init(struct net *net)
4530 mutex_init(&net->packet.sklist_lock);
4531 INIT_HLIST_HEAD(&net->packet.sklist);
4533 if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops))
4539 static void __net_exit packet_net_exit(struct net *net)
4541 remove_proc_entry("packet", net->proc_net);
4544 static struct pernet_operations packet_net_ops = {
4545 .init = packet_net_init,
4546 .exit = packet_net_exit,
4550 static void __exit packet_exit(void)
4552 unregister_netdevice_notifier(&packet_netdev_notifier);
4553 unregister_pernet_subsys(&packet_net_ops);
4554 sock_unregister(PF_PACKET);
4555 proto_unregister(&packet_proto);
4558 static int __init packet_init(void)
4560 int rc = proto_register(&packet_proto, 0);
4565 sock_register(&packet_family_ops);
4566 register_pernet_subsys(&packet_net_ops);
4567 register_netdevice_notifier(&packet_netdev_notifier);
4572 module_init(packet_init);
4573 module_exit(packet_exit);
4574 MODULE_LICENSE("GPL");
4575 MODULE_ALIAS_NETPROTO(PF_PACKET);