2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * PACKET - implements raw packet sockets.
9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Alan Cox, <gw4pts@gw4pts.ampr.org>
13 * Alan Cox : verify_area() now used correctly
14 * Alan Cox : new skbuff lists, look ma no backlogs!
15 * Alan Cox : tidied skbuff lists.
16 * Alan Cox : Now uses generic datagram routines I
17 * added. Also fixed the peek/read crash
18 * from all old Linux datagram code.
19 * Alan Cox : Uses the improved datagram code.
20 * Alan Cox : Added NULL's for socket options.
21 * Alan Cox : Re-commented the code.
22 * Alan Cox : Use new kernel side addressing
23 * Rob Janssen : Correct MTU usage.
24 * Dave Platt : Counter leaks caused by incorrect
25 * interrupt locking and some slightly
26 * dubious gcc output. Can you read
27 * compiler: it said _VOLATILE_
28 * Richard Kooijman : Timestamp fixes.
29 * Alan Cox : New buffers. Use sk->mac.raw.
30 * Alan Cox : sendmsg/recvmsg support.
31 * Alan Cox : Protocol setting support
32 * Alexey Kuznetsov : Untied from IPv4 stack.
33 * Cyrus Durgin : Fixed kerneld for kmod.
34 * Michal Ostrowski : Module initialization cleanup.
35 * Ulises Alonso : Frame number limit removal and
36 * packet_set_ring memory leak.
37 * Eric Biederman : Allow for > 8 byte hardware addresses.
38 * The convention is that longer addresses
39 * will simply extend the hardware address
40 * byte arrays at the end of sockaddr_ll
42 * Johann Baudy : Added TX RING.
43 * Chetan Loke : Implemented TPACKET_V3 block abstraction
45 * Copyright (C) 2011, <lokec@ccs.neu.edu>
48 * This program is free software; you can redistribute it and/or
49 * modify it under the terms of the GNU General Public License
50 * as published by the Free Software Foundation; either version
51 * 2 of the License, or (at your option) any later version.
55 #include <linux/types.h>
57 #include <linux/capability.h>
58 #include <linux/fcntl.h>
59 #include <linux/socket.h>
61 #include <linux/inet.h>
62 #include <linux/netdevice.h>
63 #include <linux/if_packet.h>
64 #include <linux/wireless.h>
65 #include <linux/kernel.h>
66 #include <linux/kmod.h>
67 #include <linux/slab.h>
68 #include <linux/vmalloc.h>
69 #include <net/net_namespace.h>
71 #include <net/protocol.h>
72 #include <linux/skbuff.h>
74 #include <linux/errno.h>
75 #include <linux/timer.h>
76 #include <asm/uaccess.h>
77 #include <asm/ioctls.h>
79 #include <asm/cacheflush.h>
81 #include <linux/proc_fs.h>
82 #include <linux/seq_file.h>
83 #include <linux/poll.h>
84 #include <linux/module.h>
85 #include <linux/init.h>
86 #include <linux/mutex.h>
87 #include <linux/if_vlan.h>
88 #include <linux/virtio_net.h>
89 #include <linux/errqueue.h>
90 #include <linux/net_tstamp.h>
91 #include <linux/percpu.h>
93 #include <net/inet_common.h>
95 #include <linux/bpf.h>
96 #include <net/compat.h>
102 - if device has no dev->hard_header routine, it adds and removes ll header
103 inside itself. In this case ll header is invisible outside of device,
104 but higher levels still should reserve dev->hard_header_len.
105 Some devices are enough clever to reallocate skb, when header
106 will not fit to reserved space (tunnel), another ones are silly
108 - packet socket receives packets with pulled ll header,
109 so that SOCK_RAW should push it back.
114 Incoming, dev->hard_header!=NULL
115 mac_header -> ll header
118 Outgoing, dev->hard_header!=NULL
119 mac_header -> ll header
122 Incoming, dev->hard_header==NULL
123 mac_header -> UNKNOWN position. It is very likely, that it points to ll
124 header. PPP makes it, that is wrong, because introduce
125 assymetry between rx and tx paths.
128 Outgoing, dev->hard_header==NULL
129 mac_header -> data. ll header is still not built!
133 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
139 dev->hard_header != NULL
140 mac_header -> ll header
143 dev->hard_header == NULL (ll header is added by device, we cannot control it)
147 We should set nh.raw on output to correct posistion,
148 packet classifier depends on it.
151 /* Private packet socket structures. */
153 /* identical to struct packet_mreq except it has
154 * a longer address field.
156 struct packet_mreq_max {
158 unsigned short mr_type;
159 unsigned short mr_alen;
160 unsigned char mr_address[MAX_ADDR_LEN];
164 struct tpacket_hdr *h1;
165 struct tpacket2_hdr *h2;
166 struct tpacket3_hdr *h3;
170 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
171 int closing, int tx_ring);
173 #define V3_ALIGNMENT (8)
175 #define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT))
177 #define BLK_PLUS_PRIV(sz_of_priv) \
178 (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT))
180 #define PGV_FROM_VMALLOC 1
182 #define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status)
183 #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts)
184 #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt)
185 #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len)
186 #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num)
187 #define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
188 #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x)))
191 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
192 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
193 struct packet_type *pt, struct net_device *orig_dev);
195 static void *packet_previous_frame(struct packet_sock *po,
196 struct packet_ring_buffer *rb,
198 static void packet_increment_head(struct packet_ring_buffer *buff);
199 static int prb_curr_blk_in_use(struct tpacket_kbdq_core *,
200 struct tpacket_block_desc *);
201 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *,
202 struct packet_sock *);
203 static void prb_retire_current_block(struct tpacket_kbdq_core *,
204 struct packet_sock *, unsigned int status);
205 static int prb_queue_frozen(struct tpacket_kbdq_core *);
206 static void prb_open_block(struct tpacket_kbdq_core *,
207 struct tpacket_block_desc *);
208 static void prb_retire_rx_blk_timer_expired(unsigned long);
209 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *);
210 static void prb_init_blk_timer(struct packet_sock *,
211 struct tpacket_kbdq_core *,
212 void (*func) (unsigned long));
213 static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *);
214 static void prb_clear_rxhash(struct tpacket_kbdq_core *,
215 struct tpacket3_hdr *);
216 static void prb_fill_vlan_info(struct tpacket_kbdq_core *,
217 struct tpacket3_hdr *);
218 static void packet_flush_mclist(struct sock *sk);
220 struct packet_skb_cb {
222 struct sockaddr_pkt pkt;
224 /* Trick: alias skb original length with
225 * ll.sll_family and ll.protocol in order
228 unsigned int origlen;
229 struct sockaddr_ll ll;
234 #define vio_le() virtio_legacy_is_little_endian()
236 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
238 #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
239 #define GET_PBLOCK_DESC(x, bid) \
240 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
241 #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
242 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
243 #define GET_NEXT_PRB_BLK_NUM(x) \
244 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
245 ((x)->kactive_blk_num+1) : 0)
247 static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
248 static void __fanout_link(struct sock *sk, struct packet_sock *po);
250 static int packet_direct_xmit(struct sk_buff *skb)
252 struct net_device *dev = skb->dev;
253 struct sk_buff *orig_skb = skb;
254 struct netdev_queue *txq;
255 int ret = NETDEV_TX_BUSY;
257 if (unlikely(!netif_running(dev) ||
258 !netif_carrier_ok(dev)))
261 skb = validate_xmit_skb_list(skb, dev);
265 txq = skb_get_tx_queue(dev, skb);
269 HARD_TX_LOCK(dev, txq, smp_processor_id());
270 if (!netif_xmit_frozen_or_drv_stopped(txq))
271 ret = netdev_start_xmit(skb, dev, txq, false);
272 HARD_TX_UNLOCK(dev, txq);
276 if (!dev_xmit_complete(ret))
281 atomic_long_inc(&dev->tx_dropped);
283 return NET_XMIT_DROP;
286 static struct net_device *packet_cached_dev_get(struct packet_sock *po)
288 struct net_device *dev;
291 dev = rcu_dereference(po->cached_dev);
299 static void packet_cached_dev_assign(struct packet_sock *po,
300 struct net_device *dev)
302 rcu_assign_pointer(po->cached_dev, dev);
305 static void packet_cached_dev_reset(struct packet_sock *po)
307 RCU_INIT_POINTER(po->cached_dev, NULL);
310 static bool packet_use_direct_xmit(const struct packet_sock *po)
312 return po->xmit == packet_direct_xmit;
315 static u16 __packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
317 return (u16) raw_smp_processor_id() % dev->real_num_tx_queues;
320 static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
322 const struct net_device_ops *ops = dev->netdev_ops;
325 if (ops->ndo_select_queue) {
326 queue_index = ops->ndo_select_queue(dev, skb, NULL,
327 __packet_pick_tx_queue);
328 queue_index = netdev_cap_txqueue(dev, queue_index);
330 queue_index = __packet_pick_tx_queue(dev, skb);
333 skb_set_queue_mapping(skb, queue_index);
336 /* __register_prot_hook must be invoked through register_prot_hook
337 * or from a context in which asynchronous accesses to the packet
338 * socket is not possible (packet_create()).
340 static void __register_prot_hook(struct sock *sk)
342 struct packet_sock *po = pkt_sk(sk);
346 __fanout_link(sk, po);
348 dev_add_pack(&po->prot_hook);
355 static void register_prot_hook(struct sock *sk)
357 lockdep_assert_held_once(&pkt_sk(sk)->bind_lock);
358 __register_prot_hook(sk);
361 /* If the sync parameter is true, we will temporarily drop
362 * the po->bind_lock and do a synchronize_net to make sure no
363 * asynchronous packet processing paths still refer to the elements
364 * of po->prot_hook. If the sync parameter is false, it is the
365 * callers responsibility to take care of this.
367 static void __unregister_prot_hook(struct sock *sk, bool sync)
369 struct packet_sock *po = pkt_sk(sk);
371 lockdep_assert_held_once(&po->bind_lock);
376 __fanout_unlink(sk, po);
378 __dev_remove_pack(&po->prot_hook);
383 spin_unlock(&po->bind_lock);
385 spin_lock(&po->bind_lock);
389 static void unregister_prot_hook(struct sock *sk, bool sync)
391 struct packet_sock *po = pkt_sk(sk);
394 __unregister_prot_hook(sk, sync);
397 static inline struct page * __pure pgv_to_page(void *addr)
399 if (is_vmalloc_addr(addr))
400 return vmalloc_to_page(addr);
401 return virt_to_page(addr);
404 static void __packet_set_status(struct packet_sock *po, void *frame, int status)
406 union tpacket_uhdr h;
409 switch (po->tp_version) {
411 h.h1->tp_status = status;
412 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
415 h.h2->tp_status = status;
416 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
420 WARN(1, "TPACKET version not supported.\n");
427 static int __packet_get_status(struct packet_sock *po, void *frame)
429 union tpacket_uhdr h;
434 switch (po->tp_version) {
436 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
437 return h.h1->tp_status;
439 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
440 return h.h2->tp_status;
443 WARN(1, "TPACKET version not supported.\n");
449 static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts,
452 struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
455 (flags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
456 ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts))
457 return TP_STATUS_TS_RAW_HARDWARE;
459 if (ktime_to_timespec_cond(skb->tstamp, ts))
460 return TP_STATUS_TS_SOFTWARE;
465 static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame,
468 union tpacket_uhdr h;
472 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
476 switch (po->tp_version) {
478 h.h1->tp_sec = ts.tv_sec;
479 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
482 h.h2->tp_sec = ts.tv_sec;
483 h.h2->tp_nsec = ts.tv_nsec;
487 WARN(1, "TPACKET version not supported.\n");
491 /* one flush is safe, as both fields always lie on the same cacheline */
492 flush_dcache_page(pgv_to_page(&h.h1->tp_sec));
498 static void *packet_lookup_frame(struct packet_sock *po,
499 struct packet_ring_buffer *rb,
500 unsigned int position,
503 unsigned int pg_vec_pos, frame_offset;
504 union tpacket_uhdr h;
506 pg_vec_pos = position / rb->frames_per_block;
507 frame_offset = position % rb->frames_per_block;
509 h.raw = rb->pg_vec[pg_vec_pos].buffer +
510 (frame_offset * rb->frame_size);
512 if (status != __packet_get_status(po, h.raw))
518 static void *packet_current_frame(struct packet_sock *po,
519 struct packet_ring_buffer *rb,
522 return packet_lookup_frame(po, rb, rb->head, status);
525 static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc)
527 del_timer_sync(&pkc->retire_blk_timer);
530 static void prb_shutdown_retire_blk_timer(struct packet_sock *po,
531 struct sk_buff_head *rb_queue)
533 struct tpacket_kbdq_core *pkc;
535 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
537 spin_lock_bh(&rb_queue->lock);
538 pkc->delete_blk_timer = 1;
539 spin_unlock_bh(&rb_queue->lock);
541 prb_del_retire_blk_timer(pkc);
544 static void prb_init_blk_timer(struct packet_sock *po,
545 struct tpacket_kbdq_core *pkc,
546 void (*func) (unsigned long))
548 init_timer(&pkc->retire_blk_timer);
549 pkc->retire_blk_timer.data = (long)po;
550 pkc->retire_blk_timer.function = func;
551 pkc->retire_blk_timer.expires = jiffies;
554 static void prb_setup_retire_blk_timer(struct packet_sock *po)
556 struct tpacket_kbdq_core *pkc;
558 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
559 prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired);
562 static int prb_calc_retire_blk_tmo(struct packet_sock *po,
563 int blk_size_in_bytes)
565 struct net_device *dev;
566 unsigned int mbits = 0, msec = 0, div = 0, tmo = 0;
567 struct ethtool_link_ksettings ecmd;
571 dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex);
572 if (unlikely(!dev)) {
574 return DEFAULT_PRB_RETIRE_TOV;
576 err = __ethtool_get_link_ksettings(dev, &ecmd);
580 * If the link speed is so slow you don't really
581 * need to worry about perf anyways
583 if (ecmd.base.speed < SPEED_1000 ||
584 ecmd.base.speed == SPEED_UNKNOWN) {
585 return DEFAULT_PRB_RETIRE_TOV;
588 div = ecmd.base.speed / 1000;
591 return DEFAULT_PRB_RETIRE_TOV;
593 mbits = (blk_size_in_bytes * 8) / (1024 * 1024);
605 static void prb_init_ft_ops(struct tpacket_kbdq_core *p1,
606 union tpacket_req_u *req_u)
608 p1->feature_req_word = req_u->req3.tp_feature_req_word;
611 static void init_prb_bdqc(struct packet_sock *po,
612 struct packet_ring_buffer *rb,
614 union tpacket_req_u *req_u)
616 struct tpacket_kbdq_core *p1 = GET_PBDQC_FROM_RB(rb);
617 struct tpacket_block_desc *pbd;
619 memset(p1, 0x0, sizeof(*p1));
621 p1->knxt_seq_num = 1;
623 pbd = (struct tpacket_block_desc *)pg_vec[0].buffer;
624 p1->pkblk_start = pg_vec[0].buffer;
625 p1->kblk_size = req_u->req3.tp_block_size;
626 p1->knum_blocks = req_u->req3.tp_block_nr;
627 p1->hdrlen = po->tp_hdrlen;
628 p1->version = po->tp_version;
629 p1->last_kactive_blk_num = 0;
630 po->stats.stats3.tp_freeze_q_cnt = 0;
631 if (req_u->req3.tp_retire_blk_tov)
632 p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov;
634 p1->retire_blk_tov = prb_calc_retire_blk_tmo(po,
635 req_u->req3.tp_block_size);
636 p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov);
637 p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv;
639 p1->max_frame_len = p1->kblk_size - BLK_PLUS_PRIV(p1->blk_sizeof_priv);
640 prb_init_ft_ops(p1, req_u);
641 prb_setup_retire_blk_timer(po);
642 prb_open_block(p1, pbd);
645 /* Do NOT update the last_blk_num first.
646 * Assumes sk_buff_head lock is held.
648 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc)
650 mod_timer(&pkc->retire_blk_timer,
651 jiffies + pkc->tov_in_jiffies);
652 pkc->last_kactive_blk_num = pkc->kactive_blk_num;
657 * 1) We refresh the timer only when we open a block.
658 * By doing this we don't waste cycles refreshing the timer
659 * on packet-by-packet basis.
661 * With a 1MB block-size, on a 1Gbps line, it will take
662 * i) ~8 ms to fill a block + ii) memcpy etc.
663 * In this cut we are not accounting for the memcpy time.
665 * So, if the user sets the 'tmo' to 10ms then the timer
666 * will never fire while the block is still getting filled
667 * (which is what we want). However, the user could choose
668 * to close a block early and that's fine.
670 * But when the timer does fire, we check whether or not to refresh it.
671 * Since the tmo granularity is in msecs, it is not too expensive
672 * to refresh the timer, lets say every '8' msecs.
673 * Either the user can set the 'tmo' or we can derive it based on
674 * a) line-speed and b) block-size.
675 * prb_calc_retire_blk_tmo() calculates the tmo.
678 static void prb_retire_rx_blk_timer_expired(unsigned long data)
680 struct packet_sock *po = (struct packet_sock *)data;
681 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
683 struct tpacket_block_desc *pbd;
685 spin_lock(&po->sk.sk_receive_queue.lock);
687 frozen = prb_queue_frozen(pkc);
688 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
690 if (unlikely(pkc->delete_blk_timer))
693 /* We only need to plug the race when the block is partially filled.
695 * lock(); increment BLOCK_NUM_PKTS; unlock()
696 * copy_bits() is in progress ...
697 * timer fires on other cpu:
698 * we can't retire the current block because copy_bits
702 if (BLOCK_NUM_PKTS(pbd)) {
703 while (atomic_read(&pkc->blk_fill_in_prog)) {
704 /* Waiting for skb_copy_bits to finish... */
709 if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) {
711 if (!BLOCK_NUM_PKTS(pbd)) {
712 /* An empty block. Just refresh the timer. */
715 prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO);
716 if (!prb_dispatch_next_block(pkc, po))
721 /* Case 1. Queue was frozen because user-space was
724 if (prb_curr_blk_in_use(pkc, pbd)) {
726 * Ok, user-space is still behind.
727 * So just refresh the timer.
731 /* Case 2. queue was frozen,user-space caught up,
732 * now the link went idle && the timer fired.
733 * We don't have a block to close.So we open this
734 * block and restart the timer.
735 * opening a block thaws the queue,restarts timer
736 * Thawing/timer-refresh is a side effect.
738 prb_open_block(pkc, pbd);
745 _prb_refresh_rx_retire_blk_timer(pkc);
748 spin_unlock(&po->sk.sk_receive_queue.lock);
751 static void prb_flush_block(struct tpacket_kbdq_core *pkc1,
752 struct tpacket_block_desc *pbd1, __u32 status)
754 /* Flush everything minus the block header */
756 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
761 /* Skip the block header(we know header WILL fit in 4K) */
764 end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end);
765 for (; start < end; start += PAGE_SIZE)
766 flush_dcache_page(pgv_to_page(start));
771 /* Now update the block status. */
773 BLOCK_STATUS(pbd1) = status;
775 /* Flush the block header */
777 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
779 flush_dcache_page(pgv_to_page(start));
789 * 2) Increment active_blk_num
791 * Note:We DONT refresh the timer on purpose.
792 * Because almost always the next block will be opened.
794 static void prb_close_block(struct tpacket_kbdq_core *pkc1,
795 struct tpacket_block_desc *pbd1,
796 struct packet_sock *po, unsigned int stat)
798 __u32 status = TP_STATUS_USER | stat;
800 struct tpacket3_hdr *last_pkt;
801 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
802 struct sock *sk = &po->sk;
804 if (po->stats.stats3.tp_drops)
805 status |= TP_STATUS_LOSING;
807 last_pkt = (struct tpacket3_hdr *)pkc1->prev;
808 last_pkt->tp_next_offset = 0;
810 /* Get the ts of the last pkt */
811 if (BLOCK_NUM_PKTS(pbd1)) {
812 h1->ts_last_pkt.ts_sec = last_pkt->tp_sec;
813 h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec;
815 /* Ok, we tmo'd - so get the current time.
817 * It shouldn't really happen as we don't close empty
818 * blocks. See prb_retire_rx_blk_timer_expired().
822 h1->ts_last_pkt.ts_sec = ts.tv_sec;
823 h1->ts_last_pkt.ts_nsec = ts.tv_nsec;
828 /* Flush the block */
829 prb_flush_block(pkc1, pbd1, status);
831 sk->sk_data_ready(sk);
833 pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1);
836 static void prb_thaw_queue(struct tpacket_kbdq_core *pkc)
838 pkc->reset_pending_on_curr_blk = 0;
842 * Side effect of opening a block:
844 * 1) prb_queue is thawed.
845 * 2) retire_blk_timer is refreshed.
848 static void prb_open_block(struct tpacket_kbdq_core *pkc1,
849 struct tpacket_block_desc *pbd1)
852 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
856 /* We could have just memset this but we will lose the
857 * flexibility of making the priv area sticky
860 BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++;
861 BLOCK_NUM_PKTS(pbd1) = 0;
862 BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
866 h1->ts_first_pkt.ts_sec = ts.tv_sec;
867 h1->ts_first_pkt.ts_nsec = ts.tv_nsec;
869 pkc1->pkblk_start = (char *)pbd1;
870 pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
872 BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
873 BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN;
875 pbd1->version = pkc1->version;
876 pkc1->prev = pkc1->nxt_offset;
877 pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size;
879 prb_thaw_queue(pkc1);
880 _prb_refresh_rx_retire_blk_timer(pkc1);
886 * Queue freeze logic:
887 * 1) Assume tp_block_nr = 8 blocks.
888 * 2) At time 't0', user opens Rx ring.
889 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
890 * 4) user-space is either sleeping or processing block '0'.
891 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
892 * it will close block-7,loop around and try to fill block '0'.
894 * __packet_lookup_frame_in_block
895 * prb_retire_current_block()
896 * prb_dispatch_next_block()
897 * |->(BLOCK_STATUS == USER) evaluates to true
898 * 5.1) Since block-0 is currently in-use, we just freeze the queue.
899 * 6) Now there are two cases:
900 * 6.1) Link goes idle right after the queue is frozen.
901 * But remember, the last open_block() refreshed the timer.
902 * When this timer expires,it will refresh itself so that we can
903 * re-open block-0 in near future.
904 * 6.2) Link is busy and keeps on receiving packets. This is a simple
905 * case and __packet_lookup_frame_in_block will check if block-0
906 * is free and can now be re-used.
908 static void prb_freeze_queue(struct tpacket_kbdq_core *pkc,
909 struct packet_sock *po)
911 pkc->reset_pending_on_curr_blk = 1;
912 po->stats.stats3.tp_freeze_q_cnt++;
915 #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
918 * If the next block is free then we will dispatch it
919 * and return a good offset.
920 * Else, we will freeze the queue.
921 * So, caller must check the return value.
923 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc,
924 struct packet_sock *po)
926 struct tpacket_block_desc *pbd;
930 /* 1. Get current block num */
931 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
933 /* 2. If this block is currently in_use then freeze the queue */
934 if (TP_STATUS_USER & BLOCK_STATUS(pbd)) {
935 prb_freeze_queue(pkc, po);
941 * open this block and return the offset where the first packet
942 * needs to get stored.
944 prb_open_block(pkc, pbd);
945 return (void *)pkc->nxt_offset;
948 static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
949 struct packet_sock *po, unsigned int status)
951 struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
953 /* retire/close the current block */
954 if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) {
956 * Plug the case where copy_bits() is in progress on
957 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
958 * have space to copy the pkt in the current block and
959 * called prb_retire_current_block()
961 * We don't need to worry about the TMO case because
962 * the timer-handler already handled this case.
964 if (!(status & TP_STATUS_BLK_TMO)) {
965 while (atomic_read(&pkc->blk_fill_in_prog)) {
966 /* Waiting for skb_copy_bits to finish... */
970 prb_close_block(pkc, pbd, po, status);
975 static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc,
976 struct tpacket_block_desc *pbd)
978 return TP_STATUS_USER & BLOCK_STATUS(pbd);
981 static int prb_queue_frozen(struct tpacket_kbdq_core *pkc)
983 return pkc->reset_pending_on_curr_blk;
986 static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb)
988 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
989 atomic_dec(&pkc->blk_fill_in_prog);
992 static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc,
993 struct tpacket3_hdr *ppd)
995 ppd->hv1.tp_rxhash = skb_get_hash(pkc->skb);
998 static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc,
999 struct tpacket3_hdr *ppd)
1001 ppd->hv1.tp_rxhash = 0;
1004 static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
1005 struct tpacket3_hdr *ppd)
1007 if (skb_vlan_tag_present(pkc->skb)) {
1008 ppd->hv1.tp_vlan_tci = skb_vlan_tag_get(pkc->skb);
1009 ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->vlan_proto);
1010 ppd->tp_status = TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
1012 ppd->hv1.tp_vlan_tci = 0;
1013 ppd->hv1.tp_vlan_tpid = 0;
1014 ppd->tp_status = TP_STATUS_AVAILABLE;
1018 static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc,
1019 struct tpacket3_hdr *ppd)
1021 ppd->hv1.tp_padding = 0;
1022 prb_fill_vlan_info(pkc, ppd);
1024 if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH)
1025 prb_fill_rxhash(pkc, ppd);
1027 prb_clear_rxhash(pkc, ppd);
1030 static void prb_fill_curr_block(char *curr,
1031 struct tpacket_kbdq_core *pkc,
1032 struct tpacket_block_desc *pbd,
1035 struct tpacket3_hdr *ppd;
1037 ppd = (struct tpacket3_hdr *)curr;
1038 ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len);
1040 pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len);
1041 BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len);
1042 BLOCK_NUM_PKTS(pbd) += 1;
1043 atomic_inc(&pkc->blk_fill_in_prog);
1044 prb_run_all_ft_ops(pkc, ppd);
1047 /* Assumes caller has the sk->rx_queue.lock */
1048 static void *__packet_lookup_frame_in_block(struct packet_sock *po,
1049 struct sk_buff *skb,
1054 struct tpacket_kbdq_core *pkc;
1055 struct tpacket_block_desc *pbd;
1058 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
1059 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1061 /* Queue is frozen when user space is lagging behind */
1062 if (prb_queue_frozen(pkc)) {
1064 * Check if that last block which caused the queue to freeze,
1065 * is still in_use by user-space.
1067 if (prb_curr_blk_in_use(pkc, pbd)) {
1068 /* Can't record this packet */
1072 * Ok, the block was released by user-space.
1073 * Now let's open that block.
1074 * opening a block also thaws the queue.
1075 * Thawing is a side effect.
1077 prb_open_block(pkc, pbd);
1082 curr = pkc->nxt_offset;
1084 end = (char *)pbd + pkc->kblk_size;
1086 /* first try the current block */
1087 if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) {
1088 prb_fill_curr_block(curr, pkc, pbd, len);
1089 return (void *)curr;
1092 /* Ok, close the current block */
1093 prb_retire_current_block(pkc, po, 0);
1095 /* Now, try to dispatch the next block */
1096 curr = (char *)prb_dispatch_next_block(pkc, po);
1098 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1099 prb_fill_curr_block(curr, pkc, pbd, len);
1100 return (void *)curr;
1104 * No free blocks are available.user_space hasn't caught up yet.
1105 * Queue was just frozen and now this packet will get dropped.
1110 static void *packet_current_rx_frame(struct packet_sock *po,
1111 struct sk_buff *skb,
1112 int status, unsigned int len)
1115 switch (po->tp_version) {
1118 curr = packet_lookup_frame(po, &po->rx_ring,
1119 po->rx_ring.head, status);
1122 return __packet_lookup_frame_in_block(po, skb, status, len);
1124 WARN(1, "TPACKET version not supported\n");
1130 static void *prb_lookup_block(struct packet_sock *po,
1131 struct packet_ring_buffer *rb,
1135 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
1136 struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx);
1138 if (status != BLOCK_STATUS(pbd))
1143 static int prb_previous_blk_num(struct packet_ring_buffer *rb)
1146 if (rb->prb_bdqc.kactive_blk_num)
1147 prev = rb->prb_bdqc.kactive_blk_num-1;
1149 prev = rb->prb_bdqc.knum_blocks-1;
1153 /* Assumes caller has held the rx_queue.lock */
1154 static void *__prb_previous_block(struct packet_sock *po,
1155 struct packet_ring_buffer *rb,
1158 unsigned int previous = prb_previous_blk_num(rb);
1159 return prb_lookup_block(po, rb, previous, status);
1162 static void *packet_previous_rx_frame(struct packet_sock *po,
1163 struct packet_ring_buffer *rb,
1166 if (po->tp_version <= TPACKET_V2)
1167 return packet_previous_frame(po, rb, status);
1169 return __prb_previous_block(po, rb, status);
1172 static void packet_increment_rx_head(struct packet_sock *po,
1173 struct packet_ring_buffer *rb)
1175 switch (po->tp_version) {
1178 return packet_increment_head(rb);
1181 WARN(1, "TPACKET version not supported.\n");
1187 static void *packet_previous_frame(struct packet_sock *po,
1188 struct packet_ring_buffer *rb,
1191 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
1192 return packet_lookup_frame(po, rb, previous, status);
1195 static void packet_increment_head(struct packet_ring_buffer *buff)
1197 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
1200 static void packet_inc_pending(struct packet_ring_buffer *rb)
1202 this_cpu_inc(*rb->pending_refcnt);
1205 static void packet_dec_pending(struct packet_ring_buffer *rb)
1207 this_cpu_dec(*rb->pending_refcnt);
1210 static unsigned int packet_read_pending(const struct packet_ring_buffer *rb)
1212 unsigned int refcnt = 0;
1215 /* We don't use pending refcount in rx_ring. */
1216 if (rb->pending_refcnt == NULL)
1219 for_each_possible_cpu(cpu)
1220 refcnt += *per_cpu_ptr(rb->pending_refcnt, cpu);
1225 static int packet_alloc_pending(struct packet_sock *po)
1227 po->rx_ring.pending_refcnt = NULL;
1229 po->tx_ring.pending_refcnt = alloc_percpu(unsigned int);
1230 if (unlikely(po->tx_ring.pending_refcnt == NULL))
1236 static void packet_free_pending(struct packet_sock *po)
1238 free_percpu(po->tx_ring.pending_refcnt);
1241 #define ROOM_POW_OFF 2
1242 #define ROOM_NONE 0x0
1243 #define ROOM_LOW 0x1
1244 #define ROOM_NORMAL 0x2
1246 static bool __tpacket_has_room(struct packet_sock *po, int pow_off)
1250 len = po->rx_ring.frame_max + 1;
1251 idx = po->rx_ring.head;
1253 idx += len >> pow_off;
1256 return packet_lookup_frame(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1259 static bool __tpacket_v3_has_room(struct packet_sock *po, int pow_off)
1263 len = po->rx_ring.prb_bdqc.knum_blocks;
1264 idx = po->rx_ring.prb_bdqc.kactive_blk_num;
1266 idx += len >> pow_off;
1269 return prb_lookup_block(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1272 static int __packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
1274 struct sock *sk = &po->sk;
1275 int ret = ROOM_NONE;
1277 if (po->prot_hook.func != tpacket_rcv) {
1278 int avail = sk->sk_rcvbuf - atomic_read(&sk->sk_rmem_alloc)
1279 - (skb ? skb->truesize : 0);
1280 if (avail > (sk->sk_rcvbuf >> ROOM_POW_OFF))
1288 if (po->tp_version == TPACKET_V3) {
1289 if (__tpacket_v3_has_room(po, ROOM_POW_OFF))
1291 else if (__tpacket_v3_has_room(po, 0))
1294 if (__tpacket_has_room(po, ROOM_POW_OFF))
1296 else if (__tpacket_has_room(po, 0))
1303 static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
1308 spin_lock_bh(&po->sk.sk_receive_queue.lock);
1309 ret = __packet_rcv_has_room(po, skb);
1310 has_room = ret == ROOM_NORMAL;
1311 if (po->pressure == has_room)
1312 po->pressure = !has_room;
1313 spin_unlock_bh(&po->sk.sk_receive_queue.lock);
1318 static void packet_sock_destruct(struct sock *sk)
1320 skb_queue_purge(&sk->sk_error_queue);
1322 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
1323 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
1325 if (!sock_flag(sk, SOCK_DEAD)) {
1326 pr_err("Attempt to release alive packet socket: %p\n", sk);
1330 sk_refcnt_debug_dec(sk);
1333 static bool fanout_flow_is_huge(struct packet_sock *po, struct sk_buff *skb)
1335 u32 *history = po->rollover->history;
1339 rxhash = skb_get_hash(skb);
1340 for (i = 0; i < ROLLOVER_HLEN; i++)
1341 if (READ_ONCE(history[i]) == rxhash)
1344 victim = prandom_u32() % ROLLOVER_HLEN;
1346 /* Avoid dirtying the cache line if possible */
1347 if (READ_ONCE(history[victim]) != rxhash)
1348 WRITE_ONCE(history[victim], rxhash);
1350 return count > (ROLLOVER_HLEN >> 1);
1353 static unsigned int fanout_demux_hash(struct packet_fanout *f,
1354 struct sk_buff *skb,
1357 return reciprocal_scale(__skb_get_hash_symmetric(skb), num);
1360 static unsigned int fanout_demux_lb(struct packet_fanout *f,
1361 struct sk_buff *skb,
1364 unsigned int val = atomic_inc_return(&f->rr_cur);
1369 static unsigned int fanout_demux_cpu(struct packet_fanout *f,
1370 struct sk_buff *skb,
1373 return smp_processor_id() % num;
1376 static unsigned int fanout_demux_rnd(struct packet_fanout *f,
1377 struct sk_buff *skb,
1380 return prandom_u32_max(num);
1383 static unsigned int fanout_demux_rollover(struct packet_fanout *f,
1384 struct sk_buff *skb,
1385 unsigned int idx, bool try_self,
1388 struct packet_sock *po, *po_next, *po_skip = NULL;
1389 unsigned int i, j, room = ROOM_NONE;
1391 po = pkt_sk(f->arr[idx]);
1394 room = packet_rcv_has_room(po, skb);
1395 if (room == ROOM_NORMAL ||
1396 (room == ROOM_LOW && !fanout_flow_is_huge(po, skb)))
1401 i = j = min_t(int, po->rollover->sock, num - 1);
1403 po_next = pkt_sk(f->arr[i]);
1404 if (po_next != po_skip && !po_next->pressure &&
1405 packet_rcv_has_room(po_next, skb) == ROOM_NORMAL) {
1407 po->rollover->sock = i;
1408 atomic_long_inc(&po->rollover->num);
1409 if (room == ROOM_LOW)
1410 atomic_long_inc(&po->rollover->num_huge);
1418 atomic_long_inc(&po->rollover->num_failed);
1422 static unsigned int fanout_demux_qm(struct packet_fanout *f,
1423 struct sk_buff *skb,
1426 return skb_get_queue_mapping(skb) % num;
1429 static unsigned int fanout_demux_bpf(struct packet_fanout *f,
1430 struct sk_buff *skb,
1433 struct bpf_prog *prog;
1434 unsigned int ret = 0;
1437 prog = rcu_dereference(f->bpf_prog);
1439 ret = bpf_prog_run_clear_cb(prog, skb) % num;
1445 static bool fanout_has_flag(struct packet_fanout *f, u16 flag)
1447 return f->flags & (flag >> 8);
1450 static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
1451 struct packet_type *pt, struct net_device *orig_dev)
1453 struct packet_fanout *f = pt->af_packet_priv;
1454 unsigned int num = READ_ONCE(f->num_members);
1455 struct net *net = read_pnet(&f->net);
1456 struct packet_sock *po;
1459 if (!net_eq(dev_net(dev), net) || !num) {
1464 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) {
1465 skb = ip_check_defrag(net, skb, IP_DEFRAG_AF_PACKET);
1470 case PACKET_FANOUT_HASH:
1472 idx = fanout_demux_hash(f, skb, num);
1474 case PACKET_FANOUT_LB:
1475 idx = fanout_demux_lb(f, skb, num);
1477 case PACKET_FANOUT_CPU:
1478 idx = fanout_demux_cpu(f, skb, num);
1480 case PACKET_FANOUT_RND:
1481 idx = fanout_demux_rnd(f, skb, num);
1483 case PACKET_FANOUT_QM:
1484 idx = fanout_demux_qm(f, skb, num);
1486 case PACKET_FANOUT_ROLLOVER:
1487 idx = fanout_demux_rollover(f, skb, 0, false, num);
1489 case PACKET_FANOUT_CBPF:
1490 case PACKET_FANOUT_EBPF:
1491 idx = fanout_demux_bpf(f, skb, num);
1495 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER))
1496 idx = fanout_demux_rollover(f, skb, idx, true, num);
1498 po = pkt_sk(f->arr[idx]);
1499 return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
1502 DEFINE_MUTEX(fanout_mutex);
1503 EXPORT_SYMBOL_GPL(fanout_mutex);
1504 static LIST_HEAD(fanout_list);
1506 static void __fanout_link(struct sock *sk, struct packet_sock *po)
1508 struct packet_fanout *f = po->fanout;
1510 spin_lock(&f->lock);
1511 f->arr[f->num_members] = sk;
1514 if (f->num_members == 1)
1515 dev_add_pack(&f->prot_hook);
1516 spin_unlock(&f->lock);
1519 static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
1521 struct packet_fanout *f = po->fanout;
1524 spin_lock(&f->lock);
1525 for (i = 0; i < f->num_members; i++) {
1526 if (f->arr[i] == sk)
1529 BUG_ON(i >= f->num_members);
1530 f->arr[i] = f->arr[f->num_members - 1];
1532 if (f->num_members == 0)
1533 __dev_remove_pack(&f->prot_hook);
1534 spin_unlock(&f->lock);
1537 static bool match_fanout_group(struct packet_type *ptype, struct sock *sk)
1539 if (sk->sk_family != PF_PACKET)
1542 return ptype->af_packet_priv == pkt_sk(sk)->fanout;
1545 static void fanout_init_data(struct packet_fanout *f)
1548 case PACKET_FANOUT_LB:
1549 atomic_set(&f->rr_cur, 0);
1551 case PACKET_FANOUT_CBPF:
1552 case PACKET_FANOUT_EBPF:
1553 RCU_INIT_POINTER(f->bpf_prog, NULL);
1558 static void __fanout_set_data_bpf(struct packet_fanout *f, struct bpf_prog *new)
1560 struct bpf_prog *old;
1562 spin_lock(&f->lock);
1563 old = rcu_dereference_protected(f->bpf_prog, lockdep_is_held(&f->lock));
1564 rcu_assign_pointer(f->bpf_prog, new);
1565 spin_unlock(&f->lock);
1569 bpf_prog_destroy(old);
1573 static int fanout_set_data_cbpf(struct packet_sock *po, char __user *data,
1576 struct bpf_prog *new;
1577 struct sock_fprog fprog;
1580 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1582 if (len != sizeof(fprog))
1584 if (copy_from_user(&fprog, data, len))
1587 ret = bpf_prog_create_from_user(&new, &fprog, NULL, false);
1591 __fanout_set_data_bpf(po->fanout, new);
1595 static int fanout_set_data_ebpf(struct packet_sock *po, char __user *data,
1598 struct bpf_prog *new;
1601 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1603 if (len != sizeof(fd))
1605 if (copy_from_user(&fd, data, len))
1608 new = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER);
1610 return PTR_ERR(new);
1612 __fanout_set_data_bpf(po->fanout, new);
1616 static int fanout_set_data(struct packet_sock *po, char __user *data,
1619 switch (po->fanout->type) {
1620 case PACKET_FANOUT_CBPF:
1621 return fanout_set_data_cbpf(po, data, len);
1622 case PACKET_FANOUT_EBPF:
1623 return fanout_set_data_ebpf(po, data, len);
1629 static void fanout_release_data(struct packet_fanout *f)
1632 case PACKET_FANOUT_CBPF:
1633 case PACKET_FANOUT_EBPF:
1634 __fanout_set_data_bpf(f, NULL);
1638 static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
1640 struct packet_rollover *rollover = NULL;
1641 struct packet_sock *po = pkt_sk(sk);
1642 struct packet_fanout *f, *match;
1643 u8 type = type_flags & 0xff;
1644 u8 flags = type_flags >> 8;
1648 case PACKET_FANOUT_ROLLOVER:
1649 if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)
1651 case PACKET_FANOUT_HASH:
1652 case PACKET_FANOUT_LB:
1653 case PACKET_FANOUT_CPU:
1654 case PACKET_FANOUT_RND:
1655 case PACKET_FANOUT_QM:
1656 case PACKET_FANOUT_CBPF:
1657 case PACKET_FANOUT_EBPF:
1663 mutex_lock(&fanout_mutex);
1669 if (type == PACKET_FANOUT_ROLLOVER ||
1670 (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) {
1672 rollover = kzalloc(sizeof(*rollover), GFP_KERNEL);
1675 atomic_long_set(&rollover->num, 0);
1676 atomic_long_set(&rollover->num_huge, 0);
1677 atomic_long_set(&rollover->num_failed, 0);
1681 list_for_each_entry(f, &fanout_list, list) {
1683 read_pnet(&f->net) == sock_net(sk)) {
1689 if (match && match->flags != flags)
1693 match = kzalloc(sizeof(*match), GFP_KERNEL);
1696 write_pnet(&match->net, sock_net(sk));
1699 match->flags = flags;
1700 INIT_LIST_HEAD(&match->list);
1701 spin_lock_init(&match->lock);
1702 atomic_set(&match->sk_ref, 0);
1703 fanout_init_data(match);
1704 match->prot_hook.type = po->prot_hook.type;
1705 match->prot_hook.dev = po->prot_hook.dev;
1706 match->prot_hook.func = packet_rcv_fanout;
1707 match->prot_hook.af_packet_priv = match;
1708 match->prot_hook.af_packet_net = read_pnet(&match->net);
1709 match->prot_hook.id_match = match_fanout_group;
1710 list_add(&match->list, &fanout_list);
1714 spin_lock(&po->bind_lock);
1716 match->type == type &&
1717 match->prot_hook.type == po->prot_hook.type &&
1718 match->prot_hook.dev == po->prot_hook.dev) {
1720 if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
1721 __dev_remove_pack(&po->prot_hook);
1723 /* Paired with packet_setsockopt(PACKET_FANOUT_DATA) */
1724 WRITE_ONCE(po->fanout, match);
1726 po->rollover = rollover;
1728 atomic_inc(&match->sk_ref);
1729 __fanout_link(sk, po);
1733 spin_unlock(&po->bind_lock);
1735 if (err && !atomic_read(&match->sk_ref)) {
1736 list_del(&match->list);
1742 mutex_unlock(&fanout_mutex);
1746 /* If pkt_sk(sk)->fanout->sk_ref is zero, this function removes
1747 * pkt_sk(sk)->fanout from fanout_list and returns pkt_sk(sk)->fanout.
1748 * It is the responsibility of the caller to call fanout_release_data() and
1749 * free the returned packet_fanout (after synchronize_net())
1751 static struct packet_fanout *fanout_release(struct sock *sk)
1753 struct packet_sock *po = pkt_sk(sk);
1754 struct packet_fanout *f;
1756 mutex_lock(&fanout_mutex);
1761 if (atomic_dec_and_test(&f->sk_ref))
1766 mutex_unlock(&fanout_mutex);
1771 static bool packet_extra_vlan_len_allowed(const struct net_device *dev,
1772 struct sk_buff *skb)
1774 /* Earlier code assumed this would be a VLAN pkt, double-check
1775 * this now that we have the actual packet in hand. We can only
1776 * do this check on Ethernet devices.
1778 if (unlikely(dev->type != ARPHRD_ETHER))
1781 skb_reset_mac_header(skb);
1782 return likely(eth_hdr(skb)->h_proto == htons(ETH_P_8021Q));
1785 static const struct proto_ops packet_ops;
1787 static const struct proto_ops packet_ops_spkt;
1789 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
1790 struct packet_type *pt, struct net_device *orig_dev)
1793 struct sockaddr_pkt *spkt;
1796 * When we registered the protocol we saved the socket in the data
1797 * field for just this event.
1800 sk = pt->af_packet_priv;
1803 * Yank back the headers [hope the device set this
1804 * right or kerboom...]
1806 * Incoming packets have ll header pulled,
1809 * For outgoing ones skb->data == skb_mac_header(skb)
1810 * so that this procedure is noop.
1813 if (skb->pkt_type == PACKET_LOOPBACK)
1816 if (!net_eq(dev_net(dev), sock_net(sk)))
1819 skb = skb_share_check(skb, GFP_ATOMIC);
1823 /* drop any routing info */
1826 /* drop conntrack reference */
1829 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
1831 skb_push(skb, skb->data - skb_mac_header(skb));
1834 * The SOCK_PACKET socket receives _all_ frames.
1837 spkt->spkt_family = dev->type;
1838 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
1839 spkt->spkt_protocol = skb->protocol;
1842 * Charge the memory to the socket. This is done specifically
1843 * to prevent sockets using all the memory up.
1846 if (sock_queue_rcv_skb(sk, skb) == 0)
1857 * Output a raw packet to a device layer. This bypasses all the other
1858 * protocol layers and you must therefore supply it with a complete frame
1861 static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg,
1864 struct sock *sk = sock->sk;
1865 DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name);
1866 struct sk_buff *skb = NULL;
1867 struct net_device *dev;
1868 struct sockcm_cookie sockc;
1874 * Get and verify the address.
1878 if (msg->msg_namelen < sizeof(struct sockaddr))
1880 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
1881 proto = saddr->spkt_protocol;
1883 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
1886 * Find the device first to size check it
1889 saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0;
1892 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
1898 if (!(dev->flags & IFF_UP))
1902 * You may not queue a frame bigger than the mtu. This is the lowest level
1903 * raw protocol and you must do your own fragmentation at this level.
1906 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
1907 if (!netif_supports_nofcs(dev)) {
1908 err = -EPROTONOSUPPORT;
1911 extra_len = 4; /* We're doing our own CRC */
1915 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len)
1919 size_t reserved = LL_RESERVED_SPACE(dev);
1920 int tlen = dev->needed_tailroom;
1921 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
1924 skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL);
1927 /* FIXME: Save some space for broken drivers that write a hard
1928 * header at transmission time by themselves. PPP is the notable
1929 * one here. This should really be fixed at the driver level.
1931 skb_reserve(skb, reserved);
1932 skb_reset_network_header(skb);
1934 /* Try to align data part correctly */
1939 skb_reset_network_header(skb);
1941 err = memcpy_from_msg(skb_put(skb, len), msg, len);
1947 if (!dev_validate_header(dev, skb->data, len)) {
1951 if (len > (dev->mtu + dev->hard_header_len + extra_len) &&
1952 !packet_extra_vlan_len_allowed(dev, skb)) {
1957 sockc.tsflags = sk->sk_tsflags;
1958 if (msg->msg_controllen) {
1959 err = sock_cmsg_send(sk, msg, &sockc);
1964 skb->protocol = proto;
1966 skb->priority = sk->sk_priority;
1967 skb->mark = sk->sk_mark;
1969 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
1971 if (unlikely(extra_len == 4))
1974 skb_probe_transport_header(skb, 0);
1976 dev_queue_xmit(skb);
1987 static unsigned int run_filter(struct sk_buff *skb,
1988 const struct sock *sk,
1991 struct sk_filter *filter;
1994 filter = rcu_dereference(sk->sk_filter);
1996 res = bpf_prog_run_clear_cb(filter->prog, skb);
2002 static int __packet_rcv_vnet(const struct sk_buff *skb,
2003 struct virtio_net_hdr *vnet_hdr)
2005 *vnet_hdr = (const struct virtio_net_hdr) { 0 };
2007 if (virtio_net_hdr_from_skb(skb, vnet_hdr, vio_le(), true))
2013 static int packet_rcv_vnet(struct msghdr *msg, const struct sk_buff *skb,
2016 struct virtio_net_hdr vnet_hdr;
2018 if (*len < sizeof(vnet_hdr))
2020 *len -= sizeof(vnet_hdr);
2022 if (__packet_rcv_vnet(skb, &vnet_hdr))
2025 return memcpy_to_msg(msg, (void *)&vnet_hdr, sizeof(vnet_hdr));
2029 * This function makes lazy skb cloning in hope that most of packets
2030 * are discarded by BPF.
2032 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
2033 * and skb->cb are mangled. It works because (and until) packets
2034 * falling here are owned by current CPU. Output packets are cloned
2035 * by dev_queue_xmit_nit(), input packets are processed by net_bh
2036 * sequencially, so that if we return skb to original state on exit,
2037 * we will not harm anyone.
2040 static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
2041 struct packet_type *pt, struct net_device *orig_dev)
2044 struct sockaddr_ll *sll;
2045 struct packet_sock *po;
2046 u8 *skb_head = skb->data;
2047 int skb_len = skb->len;
2048 unsigned int snaplen, res;
2049 bool is_drop_n_account = false;
2051 if (skb->pkt_type == PACKET_LOOPBACK)
2054 sk = pt->af_packet_priv;
2057 if (!net_eq(dev_net(dev), sock_net(sk)))
2062 if (dev->header_ops) {
2063 /* The device has an explicit notion of ll header,
2064 * exported to higher levels.
2066 * Otherwise, the device hides details of its frame
2067 * structure, so that corresponding packet head is
2068 * never delivered to user.
2070 if (sk->sk_type != SOCK_DGRAM)
2071 skb_push(skb, skb->data - skb_mac_header(skb));
2072 else if (skb->pkt_type == PACKET_OUTGOING) {
2073 /* Special case: outgoing packets have ll header at head */
2074 skb_pull(skb, skb_network_offset(skb));
2080 res = run_filter(skb, sk, snaplen);
2082 goto drop_n_restore;
2086 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
2089 if (skb_shared(skb)) {
2090 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
2094 if (skb_head != skb->data) {
2095 skb->data = skb_head;
2102 sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8);
2104 sll = &PACKET_SKB_CB(skb)->sa.ll;
2105 sll->sll_hatype = dev->type;
2106 sll->sll_pkttype = skb->pkt_type;
2107 if (unlikely(po->origdev))
2108 sll->sll_ifindex = orig_dev->ifindex;
2110 sll->sll_ifindex = dev->ifindex;
2112 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2114 /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg().
2115 * Use their space for storing the original skb length.
2117 PACKET_SKB_CB(skb)->sa.origlen = skb->len;
2119 if (pskb_trim(skb, snaplen))
2122 skb_set_owner_r(skb, sk);
2126 /* drop conntrack reference */
2129 spin_lock(&sk->sk_receive_queue.lock);
2130 po->stats.stats1.tp_packets++;
2131 sock_skb_set_dropcount(sk, skb);
2132 __skb_queue_tail(&sk->sk_receive_queue, skb);
2133 spin_unlock(&sk->sk_receive_queue.lock);
2134 sk->sk_data_ready(sk);
2138 is_drop_n_account = true;
2139 spin_lock(&sk->sk_receive_queue.lock);
2140 po->stats.stats1.tp_drops++;
2141 atomic_inc(&sk->sk_drops);
2142 spin_unlock(&sk->sk_receive_queue.lock);
2145 if (skb_head != skb->data && skb_shared(skb)) {
2146 skb->data = skb_head;
2150 if (!is_drop_n_account)
2157 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
2158 struct packet_type *pt, struct net_device *orig_dev)
2161 struct packet_sock *po;
2162 struct sockaddr_ll *sll;
2163 union tpacket_uhdr h;
2164 u8 *skb_head = skb->data;
2165 int skb_len = skb->len;
2166 unsigned int snaplen, res;
2167 unsigned long status = TP_STATUS_USER;
2168 unsigned short macoff, hdrlen;
2169 unsigned int netoff;
2170 struct sk_buff *copy_skb = NULL;
2173 bool is_drop_n_account = false;
2174 bool do_vnet = false;
2176 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
2177 * We may add members to them until current aligned size without forcing
2178 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
2180 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
2181 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
2183 if (skb->pkt_type == PACKET_LOOPBACK)
2186 sk = pt->af_packet_priv;
2189 if (!net_eq(dev_net(dev), sock_net(sk)))
2192 if (dev->header_ops) {
2193 if (sk->sk_type != SOCK_DGRAM)
2194 skb_push(skb, skb->data - skb_mac_header(skb));
2195 else if (skb->pkt_type == PACKET_OUTGOING) {
2196 /* Special case: outgoing packets have ll header at head */
2197 skb_pull(skb, skb_network_offset(skb));
2203 res = run_filter(skb, sk, snaplen);
2205 goto drop_n_restore;
2207 if (skb->ip_summed == CHECKSUM_PARTIAL)
2208 status |= TP_STATUS_CSUMNOTREADY;
2209 else if (skb->pkt_type != PACKET_OUTGOING &&
2210 (skb->ip_summed == CHECKSUM_COMPLETE ||
2211 skb_csum_unnecessary(skb)))
2212 status |= TP_STATUS_CSUM_VALID;
2217 if (sk->sk_type == SOCK_DGRAM) {
2218 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
2221 unsigned int maclen = skb_network_offset(skb);
2222 netoff = TPACKET_ALIGN(po->tp_hdrlen +
2223 (maclen < 16 ? 16 : maclen)) +
2225 if (po->has_vnet_hdr) {
2226 netoff += sizeof(struct virtio_net_hdr);
2229 macoff = netoff - maclen;
2231 if (netoff > USHRT_MAX) {
2232 spin_lock(&sk->sk_receive_queue.lock);
2233 po->stats.stats1.tp_drops++;
2234 spin_unlock(&sk->sk_receive_queue.lock);
2235 goto drop_n_restore;
2237 if (po->tp_version <= TPACKET_V2) {
2238 if (macoff + snaplen > po->rx_ring.frame_size) {
2239 if (po->copy_thresh &&
2240 atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
2241 if (skb_shared(skb)) {
2242 copy_skb = skb_clone(skb, GFP_ATOMIC);
2244 copy_skb = skb_get(skb);
2245 skb_head = skb->data;
2248 memset(&PACKET_SKB_CB(copy_skb)->sa.ll, 0,
2249 sizeof(PACKET_SKB_CB(copy_skb)->sa.ll));
2250 skb_set_owner_r(copy_skb, sk);
2253 snaplen = po->rx_ring.frame_size - macoff;
2254 if ((int)snaplen < 0) {
2259 } else if (unlikely(macoff + snaplen >
2260 GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) {
2263 nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff;
2264 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
2265 snaplen, nval, macoff);
2267 if (unlikely((int)snaplen < 0)) {
2269 macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len;
2273 spin_lock(&sk->sk_receive_queue.lock);
2274 h.raw = packet_current_rx_frame(po, skb,
2275 TP_STATUS_KERNEL, (macoff+snaplen));
2277 goto drop_n_account;
2278 if (po->tp_version <= TPACKET_V2) {
2279 packet_increment_rx_head(po, &po->rx_ring);
2281 * LOSING will be reported till you read the stats,
2282 * because it's COR - Clear On Read.
2283 * Anyways, moving it for V1/V2 only as V3 doesn't need this
2286 if (po->stats.stats1.tp_drops)
2287 status |= TP_STATUS_LOSING;
2291 __packet_rcv_vnet(skb, h.raw + macoff -
2292 sizeof(struct virtio_net_hdr)))
2293 goto drop_n_account;
2295 po->stats.stats1.tp_packets++;
2297 status |= TP_STATUS_COPY;
2298 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
2300 spin_unlock(&sk->sk_receive_queue.lock);
2302 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
2304 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
2305 getnstimeofday(&ts);
2307 status |= ts_status;
2309 switch (po->tp_version) {
2311 h.h1->tp_len = skb->len;
2312 h.h1->tp_snaplen = snaplen;
2313 h.h1->tp_mac = macoff;
2314 h.h1->tp_net = netoff;
2315 h.h1->tp_sec = ts.tv_sec;
2316 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
2317 hdrlen = sizeof(*h.h1);
2320 h.h2->tp_len = skb->len;
2321 h.h2->tp_snaplen = snaplen;
2322 h.h2->tp_mac = macoff;
2323 h.h2->tp_net = netoff;
2324 h.h2->tp_sec = ts.tv_sec;
2325 h.h2->tp_nsec = ts.tv_nsec;
2326 if (skb_vlan_tag_present(skb)) {
2327 h.h2->tp_vlan_tci = skb_vlan_tag_get(skb);
2328 h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto);
2329 status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
2331 h.h2->tp_vlan_tci = 0;
2332 h.h2->tp_vlan_tpid = 0;
2334 memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding));
2335 hdrlen = sizeof(*h.h2);
2338 /* tp_nxt_offset,vlan are already populated above.
2339 * So DONT clear those fields here
2341 h.h3->tp_status |= status;
2342 h.h3->tp_len = skb->len;
2343 h.h3->tp_snaplen = snaplen;
2344 h.h3->tp_mac = macoff;
2345 h.h3->tp_net = netoff;
2346 h.h3->tp_sec = ts.tv_sec;
2347 h.h3->tp_nsec = ts.tv_nsec;
2348 memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding));
2349 hdrlen = sizeof(*h.h3);
2355 sll = h.raw + TPACKET_ALIGN(hdrlen);
2356 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2357 sll->sll_family = AF_PACKET;
2358 sll->sll_hatype = dev->type;
2359 sll->sll_protocol = skb->protocol;
2360 sll->sll_pkttype = skb->pkt_type;
2361 if (unlikely(po->origdev))
2362 sll->sll_ifindex = orig_dev->ifindex;
2364 sll->sll_ifindex = dev->ifindex;
2368 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
2369 if (po->tp_version <= TPACKET_V2) {
2372 end = (u8 *) PAGE_ALIGN((unsigned long) h.raw +
2375 for (start = h.raw; start < end; start += PAGE_SIZE)
2376 flush_dcache_page(pgv_to_page(start));
2381 if (po->tp_version <= TPACKET_V2) {
2382 __packet_set_status(po, h.raw, status);
2383 sk->sk_data_ready(sk);
2385 prb_clear_blk_fill_status(&po->rx_ring);
2389 if (skb_head != skb->data && skb_shared(skb)) {
2390 skb->data = skb_head;
2394 if (!is_drop_n_account)
2401 is_drop_n_account = true;
2402 po->stats.stats1.tp_drops++;
2403 spin_unlock(&sk->sk_receive_queue.lock);
2405 sk->sk_data_ready(sk);
2406 kfree_skb(copy_skb);
2407 goto drop_n_restore;
2410 static void tpacket_destruct_skb(struct sk_buff *skb)
2412 struct packet_sock *po = pkt_sk(skb->sk);
2414 if (likely(po->tx_ring.pg_vec)) {
2418 ph = skb_shinfo(skb)->destructor_arg;
2419 packet_dec_pending(&po->tx_ring);
2421 ts = __packet_set_timestamp(po, ph, skb);
2422 __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts);
2424 if (!packet_read_pending(&po->tx_ring))
2425 complete(&po->skb_completion);
2431 static void tpacket_set_protocol(const struct net_device *dev,
2432 struct sk_buff *skb)
2434 if (dev->type == ARPHRD_ETHER) {
2435 skb_reset_mac_header(skb);
2436 skb->protocol = eth_hdr(skb)->h_proto;
2440 static int __packet_snd_vnet_parse(struct virtio_net_hdr *vnet_hdr, size_t len)
2442 unsigned short gso_type = 0;
2444 if ((vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
2445 (__virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2446 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2 >
2447 __virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len)))
2448 vnet_hdr->hdr_len = __cpu_to_virtio16(vio_le(),
2449 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2450 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2);
2452 if (__virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len) > len)
2455 if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2456 switch (vnet_hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2457 case VIRTIO_NET_HDR_GSO_TCPV4:
2458 gso_type = SKB_GSO_TCPV4;
2460 case VIRTIO_NET_HDR_GSO_TCPV6:
2461 gso_type = SKB_GSO_TCPV6;
2463 case VIRTIO_NET_HDR_GSO_UDP:
2464 gso_type = SKB_GSO_UDP;
2470 if (vnet_hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
2471 gso_type |= SKB_GSO_TCP_ECN;
2473 if (vnet_hdr->gso_size == 0)
2477 vnet_hdr->gso_type = gso_type; /* changes type, temporary storage */
2481 static int packet_snd_vnet_parse(struct msghdr *msg, size_t *len,
2482 struct virtio_net_hdr *vnet_hdr)
2486 if (*len < sizeof(*vnet_hdr))
2488 *len -= sizeof(*vnet_hdr);
2490 n = copy_from_iter(vnet_hdr, sizeof(*vnet_hdr), &msg->msg_iter);
2491 if (n != sizeof(*vnet_hdr))
2494 return __packet_snd_vnet_parse(vnet_hdr, *len);
2497 static int packet_snd_vnet_gso(struct sk_buff *skb,
2498 struct virtio_net_hdr *vnet_hdr)
2500 if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
2501 u16 s = __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start);
2502 u16 o = __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset);
2504 if (!skb_partial_csum_set(skb, s, o))
2508 skb_shinfo(skb)->gso_size =
2509 __virtio16_to_cpu(vio_le(), vnet_hdr->gso_size);
2510 skb_shinfo(skb)->gso_type = vnet_hdr->gso_type;
2512 /* Header must be checked, and gso_segs computed. */
2513 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2514 skb_shinfo(skb)->gso_segs = 0;
2518 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
2519 void *frame, struct net_device *dev, void *data, int tp_len,
2520 __be16 proto, unsigned char *addr, int hlen, int copylen,
2521 const struct sockcm_cookie *sockc)
2523 union tpacket_uhdr ph;
2524 int to_write, offset, len, nr_frags, len_max;
2525 struct socket *sock = po->sk.sk_socket;
2531 skb->protocol = proto;
2533 skb->priority = po->sk.sk_priority;
2534 skb->mark = po->sk.sk_mark;
2535 sock_tx_timestamp(&po->sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags);
2536 skb_shinfo(skb)->destructor_arg = ph.raw;
2538 skb_reserve(skb, hlen);
2539 skb_reset_network_header(skb);
2543 if (sock->type == SOCK_DGRAM) {
2544 err = dev_hard_header(skb, dev, ntohs(proto), addr,
2546 if (unlikely(err < 0))
2548 } else if (copylen) {
2549 int hdrlen = min_t(int, copylen, tp_len);
2551 skb_push(skb, dev->hard_header_len);
2552 skb_put(skb, copylen - dev->hard_header_len);
2553 err = skb_store_bits(skb, 0, data, hdrlen);
2556 if (!dev_validate_header(dev, skb->data, hdrlen))
2559 tpacket_set_protocol(dev, skb);
2565 offset = offset_in_page(data);
2566 len_max = PAGE_SIZE - offset;
2567 len = ((to_write > len_max) ? len_max : to_write);
2569 skb->data_len = to_write;
2570 skb->len += to_write;
2571 skb->truesize += to_write;
2572 atomic_add(to_write, &po->sk.sk_wmem_alloc);
2574 while (likely(to_write)) {
2575 nr_frags = skb_shinfo(skb)->nr_frags;
2577 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
2578 pr_err("Packet exceed the number of skb frags(%lu)\n",
2583 page = pgv_to_page(data);
2585 flush_dcache_page(page);
2587 skb_fill_page_desc(skb, nr_frags, page, offset, len);
2590 len_max = PAGE_SIZE;
2591 len = ((to_write > len_max) ? len_max : to_write);
2594 skb_probe_transport_header(skb, 0);
2599 static int tpacket_parse_header(struct packet_sock *po, void *frame,
2600 int size_max, void **data)
2602 union tpacket_uhdr ph;
2607 switch (po->tp_version) {
2609 tp_len = ph.h2->tp_len;
2612 tp_len = ph.h1->tp_len;
2615 if (unlikely(tp_len > size_max)) {
2616 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
2620 if (unlikely(po->tp_tx_has_off)) {
2621 int off_min, off_max;
2623 off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2624 off_max = po->tx_ring.frame_size - tp_len;
2625 if (po->sk.sk_type == SOCK_DGRAM) {
2626 switch (po->tp_version) {
2628 off = ph.h2->tp_net;
2631 off = ph.h1->tp_net;
2635 switch (po->tp_version) {
2637 off = ph.h2->tp_mac;
2640 off = ph.h1->tp_mac;
2644 if (unlikely((off < off_min) || (off_max < off)))
2647 off = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2650 *data = frame + off;
2654 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
2656 struct sk_buff *skb = NULL;
2657 struct net_device *dev;
2658 struct virtio_net_hdr *vnet_hdr = NULL;
2659 struct sockcm_cookie sockc;
2661 int err, reserve = 0;
2663 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2664 bool need_wait = !(msg->msg_flags & MSG_DONTWAIT);
2665 unsigned char *addr = NULL;
2666 int tp_len, size_max;
2669 int status = TP_STATUS_AVAILABLE;
2670 int hlen, tlen, copylen = 0;
2673 mutex_lock(&po->pg_vec_lock);
2675 /* packet_sendmsg() check on tx_ring.pg_vec was lockless,
2676 * we need to confirm it under protection of pg_vec_lock.
2678 if (unlikely(!po->tx_ring.pg_vec)) {
2682 if (likely(saddr == NULL)) {
2683 dev = packet_cached_dev_get(po);
2684 proto = READ_ONCE(po->num);
2687 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2689 if (msg->msg_namelen < (saddr->sll_halen
2690 + offsetof(struct sockaddr_ll,
2693 proto = saddr->sll_protocol;
2694 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
2695 if (po->sk.sk_socket->type == SOCK_DGRAM) {
2696 if (dev && msg->msg_namelen < dev->addr_len +
2697 offsetof(struct sockaddr_ll, sll_addr))
2699 addr = saddr->sll_addr;
2704 if (unlikely(dev == NULL))
2707 if (unlikely(!(dev->flags & IFF_UP)))
2710 sockc.tsflags = po->sk.sk_tsflags;
2711 if (msg->msg_controllen) {
2712 err = sock_cmsg_send(&po->sk, msg, &sockc);
2717 if (po->sk.sk_socket->type == SOCK_RAW)
2718 reserve = dev->hard_header_len;
2719 size_max = po->tx_ring.frame_size
2720 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
2722 if ((size_max > dev->mtu + reserve + VLAN_HLEN) && !po->has_vnet_hdr)
2723 size_max = dev->mtu + reserve + VLAN_HLEN;
2725 reinit_completion(&po->skb_completion);
2728 ph = packet_current_frame(po, &po->tx_ring,
2729 TP_STATUS_SEND_REQUEST);
2730 if (unlikely(ph == NULL)) {
2731 if (need_wait && skb) {
2732 timeo = sock_sndtimeo(&po->sk, msg->msg_flags & MSG_DONTWAIT);
2733 timeo = wait_for_completion_interruptible_timeout(&po->skb_completion, timeo);
2735 err = !timeo ? -ETIMEDOUT : -ERESTARTSYS;
2739 /* check for additional frames */
2744 tp_len = tpacket_parse_header(po, ph, size_max, &data);
2748 status = TP_STATUS_SEND_REQUEST;
2749 hlen = LL_RESERVED_SPACE(dev);
2750 tlen = dev->needed_tailroom;
2751 if (po->has_vnet_hdr) {
2753 data += sizeof(*vnet_hdr);
2754 tp_len -= sizeof(*vnet_hdr);
2756 __packet_snd_vnet_parse(vnet_hdr, tp_len)) {
2760 copylen = __virtio16_to_cpu(vio_le(),
2763 copylen = max_t(int, copylen, dev->hard_header_len);
2764 skb = sock_alloc_send_skb(&po->sk,
2765 hlen + tlen + sizeof(struct sockaddr_ll) +
2766 (copylen - dev->hard_header_len),
2769 if (unlikely(skb == NULL)) {
2770 /* we assume the socket was initially writeable ... */
2771 if (likely(len_sum > 0))
2775 tp_len = tpacket_fill_skb(po, skb, ph, dev, data, tp_len, proto,
2776 addr, hlen, copylen, &sockc);
2777 if (likely(tp_len >= 0) &&
2778 tp_len > dev->mtu + reserve &&
2779 !po->has_vnet_hdr &&
2780 !packet_extra_vlan_len_allowed(dev, skb))
2783 if (unlikely(tp_len < 0)) {
2786 __packet_set_status(po, ph,
2787 TP_STATUS_AVAILABLE);
2788 packet_increment_head(&po->tx_ring);
2792 status = TP_STATUS_WRONG_FORMAT;
2798 if (po->has_vnet_hdr && packet_snd_vnet_gso(skb, vnet_hdr)) {
2803 packet_pick_tx_queue(dev, skb);
2805 skb->destructor = tpacket_destruct_skb;
2806 __packet_set_status(po, ph, TP_STATUS_SENDING);
2807 packet_inc_pending(&po->tx_ring);
2809 status = TP_STATUS_SEND_REQUEST;
2810 err = po->xmit(skb);
2811 if (unlikely(err != 0)) {
2813 err = net_xmit_errno(err);
2814 if (err && __packet_get_status(po, ph) ==
2815 TP_STATUS_AVAILABLE) {
2816 /* skb was destructed already */
2821 * skb was dropped but not destructed yet;
2822 * let's treat it like congestion or err < 0
2826 packet_increment_head(&po->tx_ring);
2828 } while (likely((ph != NULL) ||
2829 /* Note: packet_read_pending() might be slow if we have
2830 * to call it as it's per_cpu variable, but in fast-path
2831 * we already short-circuit the loop with the first
2832 * condition, and luckily don't have to go that path
2835 (need_wait && packet_read_pending(&po->tx_ring))));
2841 __packet_set_status(po, ph, status);
2846 mutex_unlock(&po->pg_vec_lock);
2850 static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
2851 size_t reserve, size_t len,
2852 size_t linear, int noblock,
2855 struct sk_buff *skb;
2857 /* Under a page? Don't bother with paged skb. */
2858 if (prepad + len < PAGE_SIZE || !linear)
2861 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
2866 skb_reserve(skb, reserve);
2867 skb_put(skb, linear);
2868 skb->data_len = len - linear;
2869 skb->len += len - linear;
2874 static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
2876 struct sock *sk = sock->sk;
2877 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2878 struct sk_buff *skb;
2879 struct net_device *dev;
2881 unsigned char *addr = NULL;
2882 int err, reserve = 0;
2883 struct sockcm_cookie sockc;
2884 struct virtio_net_hdr vnet_hdr = { 0 };
2886 struct packet_sock *po = pkt_sk(sk);
2887 bool has_vnet_hdr = false;
2888 int hlen, tlen, linear;
2892 * Get and verify the address.
2895 if (likely(saddr == NULL)) {
2896 dev = packet_cached_dev_get(po);
2897 proto = READ_ONCE(po->num);
2900 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2902 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
2904 proto = saddr->sll_protocol;
2905 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
2906 if (sock->type == SOCK_DGRAM) {
2907 if (dev && msg->msg_namelen < dev->addr_len +
2908 offsetof(struct sockaddr_ll, sll_addr))
2910 addr = saddr->sll_addr;
2915 if (unlikely(dev == NULL))
2918 if (unlikely(!(dev->flags & IFF_UP)))
2921 sockc.tsflags = sk->sk_tsflags;
2922 sockc.mark = sk->sk_mark;
2923 if (msg->msg_controllen) {
2924 err = sock_cmsg_send(sk, msg, &sockc);
2929 if (sock->type == SOCK_RAW)
2930 reserve = dev->hard_header_len;
2931 if (po->has_vnet_hdr) {
2932 err = packet_snd_vnet_parse(msg, &len, &vnet_hdr);
2935 has_vnet_hdr = true;
2938 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
2939 if (!netif_supports_nofcs(dev)) {
2940 err = -EPROTONOSUPPORT;
2943 extra_len = 4; /* We're doing our own CRC */
2947 if (!vnet_hdr.gso_type &&
2948 (len > dev->mtu + reserve + VLAN_HLEN + extra_len))
2952 hlen = LL_RESERVED_SPACE(dev);
2953 tlen = dev->needed_tailroom;
2954 linear = __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len);
2955 linear = max(linear, min_t(int, len, dev->hard_header_len));
2956 skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, linear,
2957 msg->msg_flags & MSG_DONTWAIT, &err);
2961 skb_reset_network_header(skb);
2964 if (sock->type == SOCK_DGRAM) {
2965 offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len);
2966 if (unlikely(offset < 0))
2968 } else if (reserve) {
2969 skb_reserve(skb, -reserve);
2971 skb_reset_network_header(skb);
2974 /* Returns -EFAULT on error */
2975 err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len);
2979 if (sock->type == SOCK_RAW &&
2980 !dev_validate_header(dev, skb->data, len)) {
2985 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
2987 if (!vnet_hdr.gso_type && (len > dev->mtu + reserve + extra_len) &&
2988 !packet_extra_vlan_len_allowed(dev, skb)) {
2993 skb->protocol = proto;
2995 skb->priority = sk->sk_priority;
2996 skb->mark = sockc.mark;
2998 packet_pick_tx_queue(dev, skb);
3001 err = packet_snd_vnet_gso(skb, &vnet_hdr);
3004 len += sizeof(vnet_hdr);
3007 skb_probe_transport_header(skb, reserve);
3009 if (unlikely(extra_len == 4))
3012 err = po->xmit(skb);
3013 if (unlikely(err != 0)) {
3015 err = net_xmit_errno(err);
3033 static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3035 struct sock *sk = sock->sk;
3036 struct packet_sock *po = pkt_sk(sk);
3038 if (po->tx_ring.pg_vec)
3039 return tpacket_snd(po, msg);
3041 return packet_snd(sock, msg, len);
3045 * Close a PACKET socket. This is fairly simple. We immediately go
3046 * to 'closed' state and remove our protocol entry in the device list.
3049 static int packet_release(struct socket *sock)
3051 struct sock *sk = sock->sk;
3052 struct packet_sock *po;
3053 struct packet_fanout *f;
3055 union tpacket_req_u req_u;
3063 mutex_lock(&net->packet.sklist_lock);
3064 sk_del_node_init_rcu(sk);
3065 mutex_unlock(&net->packet.sklist_lock);
3068 sock_prot_inuse_add(net, sk->sk_prot, -1);
3071 spin_lock(&po->bind_lock);
3072 unregister_prot_hook(sk, false);
3073 packet_cached_dev_reset(po);
3075 if (po->prot_hook.dev) {
3076 dev_put(po->prot_hook.dev);
3077 po->prot_hook.dev = NULL;
3079 spin_unlock(&po->bind_lock);
3081 packet_flush_mclist(sk);
3084 if (po->rx_ring.pg_vec) {
3085 memset(&req_u, 0, sizeof(req_u));
3086 packet_set_ring(sk, &req_u, 1, 0);
3089 if (po->tx_ring.pg_vec) {
3090 memset(&req_u, 0, sizeof(req_u));
3091 packet_set_ring(sk, &req_u, 1, 1);
3095 f = fanout_release(sk);
3100 kfree(po->rollover);
3101 fanout_release_data(f);
3105 * Now the socket is dead. No more input will appear.
3112 skb_queue_purge(&sk->sk_receive_queue);
3113 packet_free_pending(po);
3114 sk_refcnt_debug_release(sk);
3121 * Attach a packet hook.
3124 static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
3127 struct packet_sock *po = pkt_sk(sk);
3128 struct net_device *dev_curr;
3131 struct net_device *dev = NULL;
3133 bool unlisted = false;
3136 spin_lock(&po->bind_lock);
3145 dev = dev_get_by_name_rcu(sock_net(sk), name);
3150 } else if (ifindex) {
3151 dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
3161 proto_curr = po->prot_hook.type;
3162 dev_curr = po->prot_hook.dev;
3164 need_rehook = proto_curr != proto || dev_curr != dev;
3169 /* prevents packet_notifier() from calling
3170 * register_prot_hook()
3172 WRITE_ONCE(po->num, 0);
3173 __unregister_prot_hook(sk, true);
3175 dev_curr = po->prot_hook.dev;
3177 unlisted = !dev_get_by_index_rcu(sock_net(sk),
3181 BUG_ON(po->running);
3182 WRITE_ONCE(po->num, proto);
3183 po->prot_hook.type = proto;
3185 if (unlikely(unlisted)) {
3187 po->prot_hook.dev = NULL;
3188 WRITE_ONCE(po->ifindex, -1);
3189 packet_cached_dev_reset(po);
3191 po->prot_hook.dev = dev;
3192 WRITE_ONCE(po->ifindex, dev ? dev->ifindex : 0);
3193 packet_cached_dev_assign(po, dev);
3199 if (proto == 0 || !need_rehook)
3202 if (!unlisted && (!dev || (dev->flags & IFF_UP))) {
3203 register_prot_hook(sk);
3205 sk->sk_err = ENETDOWN;
3206 if (!sock_flag(sk, SOCK_DEAD))
3207 sk->sk_error_report(sk);
3212 spin_unlock(&po->bind_lock);
3218 * Bind a packet socket to a device
3221 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
3224 struct sock *sk = sock->sk;
3225 char name[sizeof(uaddr->sa_data) + 1];
3231 if (addr_len != sizeof(struct sockaddr))
3233 /* uaddr->sa_data comes from the userspace, it's not guaranteed to be
3236 memcpy(name, uaddr->sa_data, sizeof(uaddr->sa_data));
3237 name[sizeof(uaddr->sa_data)] = 0;
3239 return packet_do_bind(sk, name, 0, pkt_sk(sk)->num);
3242 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
3244 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
3245 struct sock *sk = sock->sk;
3251 if (addr_len < sizeof(struct sockaddr_ll))
3253 if (sll->sll_family != AF_PACKET)
3256 return packet_do_bind(sk, NULL, sll->sll_ifindex,
3257 sll->sll_protocol ? : pkt_sk(sk)->num);
3260 static struct proto packet_proto = {
3262 .owner = THIS_MODULE,
3263 .obj_size = sizeof(struct packet_sock),
3267 * Create a packet of type SOCK_PACKET.
3270 static int packet_create(struct net *net, struct socket *sock, int protocol,
3274 struct packet_sock *po;
3275 __be16 proto = (__force __be16)protocol; /* weird, but documented */
3278 if (!ns_capable(net->user_ns, CAP_NET_RAW))
3280 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
3281 sock->type != SOCK_PACKET)
3282 return -ESOCKTNOSUPPORT;
3284 sock->state = SS_UNCONNECTED;
3287 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto, kern);
3291 sock->ops = &packet_ops;
3292 if (sock->type == SOCK_PACKET)
3293 sock->ops = &packet_ops_spkt;
3295 sock_init_data(sock, sk);
3298 init_completion(&po->skb_completion);
3299 sk->sk_family = PF_PACKET;
3301 po->xmit = dev_queue_xmit;
3303 err = packet_alloc_pending(po);
3307 packet_cached_dev_reset(po);
3309 sk->sk_destruct = packet_sock_destruct;
3310 sk_refcnt_debug_inc(sk);
3313 * Attach a protocol block
3316 spin_lock_init(&po->bind_lock);
3317 mutex_init(&po->pg_vec_lock);
3318 po->rollover = NULL;
3319 po->prot_hook.func = packet_rcv;
3321 if (sock->type == SOCK_PACKET)
3322 po->prot_hook.func = packet_rcv_spkt;
3324 po->prot_hook.af_packet_priv = sk;
3325 po->prot_hook.af_packet_net = sock_net(sk);
3328 po->prot_hook.type = proto;
3329 __register_prot_hook(sk);
3332 mutex_lock(&net->packet.sklist_lock);
3333 sk_add_node_tail_rcu(sk, &net->packet.sklist);
3334 mutex_unlock(&net->packet.sklist_lock);
3337 sock_prot_inuse_add(net, &packet_proto, 1);
3348 * Pull a packet from our receive queue and hand it to the user.
3349 * If necessary we block.
3352 static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3355 struct sock *sk = sock->sk;
3356 struct sk_buff *skb;
3358 int vnet_hdr_len = 0;
3359 unsigned int origlen = 0;
3362 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
3366 /* What error should we return now? EUNATTACH? */
3367 if (pkt_sk(sk)->ifindex < 0)
3371 if (flags & MSG_ERRQUEUE) {
3372 err = sock_recv_errqueue(sk, msg, len,
3373 SOL_PACKET, PACKET_TX_TIMESTAMP);
3378 * Call the generic datagram receiver. This handles all sorts
3379 * of horrible races and re-entrancy so we can forget about it
3380 * in the protocol layers.
3382 * Now it will return ENETDOWN, if device have just gone down,
3383 * but then it will block.
3386 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3389 * An error occurred so return it. Because skb_recv_datagram()
3390 * handles the blocking we don't see and worry about blocking
3397 if (pkt_sk(sk)->pressure)
3398 packet_rcv_has_room(pkt_sk(sk), NULL);
3400 if (pkt_sk(sk)->has_vnet_hdr) {
3401 err = packet_rcv_vnet(msg, skb, &len);
3404 vnet_hdr_len = sizeof(struct virtio_net_hdr);
3407 /* You lose any data beyond the buffer you gave. If it worries
3408 * a user program they can ask the device for its MTU
3414 msg->msg_flags |= MSG_TRUNC;
3417 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3421 if (sock->type != SOCK_PACKET) {
3422 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3424 /* Original length was stored in sockaddr_ll fields */
3425 origlen = PACKET_SKB_CB(skb)->sa.origlen;
3426 sll->sll_family = AF_PACKET;
3427 sll->sll_protocol = skb->protocol;
3430 sock_recv_ts_and_drops(msg, sk, skb);
3432 if (msg->msg_name) {
3433 const size_t max_len = min(sizeof(skb->cb),
3434 sizeof(struct sockaddr_storage));
3437 /* If the address length field is there to be filled
3438 * in, we fill it in now.
3440 if (sock->type == SOCK_PACKET) {
3441 __sockaddr_check_size(sizeof(struct sockaddr_pkt));
3442 msg->msg_namelen = sizeof(struct sockaddr_pkt);
3443 copy_len = msg->msg_namelen;
3445 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3447 msg->msg_namelen = sll->sll_halen +
3448 offsetof(struct sockaddr_ll, sll_addr);
3449 copy_len = msg->msg_namelen;
3450 if (msg->msg_namelen < sizeof(struct sockaddr_ll)) {
3451 memset(msg->msg_name +
3452 offsetof(struct sockaddr_ll, sll_addr),
3453 0, sizeof(sll->sll_addr));
3454 msg->msg_namelen = sizeof(struct sockaddr_ll);
3457 if (WARN_ON_ONCE(copy_len > max_len)) {
3459 msg->msg_namelen = copy_len;
3461 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, copy_len);
3464 if (pkt_sk(sk)->auxdata) {
3465 struct tpacket_auxdata aux;
3467 aux.tp_status = TP_STATUS_USER;
3468 if (skb->ip_summed == CHECKSUM_PARTIAL)
3469 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
3470 else if (skb->pkt_type != PACKET_OUTGOING &&
3471 (skb->ip_summed == CHECKSUM_COMPLETE ||
3472 skb_csum_unnecessary(skb)))
3473 aux.tp_status |= TP_STATUS_CSUM_VALID;
3475 aux.tp_len = origlen;
3476 aux.tp_snaplen = skb->len;
3478 aux.tp_net = skb_network_offset(skb);
3479 if (skb_vlan_tag_present(skb)) {
3480 aux.tp_vlan_tci = skb_vlan_tag_get(skb);
3481 aux.tp_vlan_tpid = ntohs(skb->vlan_proto);
3482 aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
3484 aux.tp_vlan_tci = 0;
3485 aux.tp_vlan_tpid = 0;
3487 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
3491 * Free or return the buffer as appropriate. Again this
3492 * hides all the races and re-entrancy issues from us.
3494 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
3497 skb_free_datagram(sk, skb);
3502 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
3503 int *uaddr_len, int peer)
3505 struct net_device *dev;
3506 struct sock *sk = sock->sk;
3511 uaddr->sa_family = AF_PACKET;
3512 memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
3514 dev = dev_get_by_index_rcu(sock_net(sk), READ_ONCE(pkt_sk(sk)->ifindex));
3516 strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
3518 *uaddr_len = sizeof(*uaddr);
3523 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
3524 int *uaddr_len, int peer)
3526 struct net_device *dev;
3527 struct sock *sk = sock->sk;
3528 struct packet_sock *po = pkt_sk(sk);
3529 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
3535 ifindex = READ_ONCE(po->ifindex);
3536 sll->sll_family = AF_PACKET;
3537 sll->sll_ifindex = ifindex;
3538 sll->sll_protocol = READ_ONCE(po->num);
3539 sll->sll_pkttype = 0;
3541 dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
3543 sll->sll_hatype = dev->type;
3544 sll->sll_halen = dev->addr_len;
3545 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
3547 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
3551 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
3556 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
3560 case PACKET_MR_MULTICAST:
3561 if (i->alen != dev->addr_len)
3564 return dev_mc_add(dev, i->addr);
3566 return dev_mc_del(dev, i->addr);
3568 case PACKET_MR_PROMISC:
3569 return dev_set_promiscuity(dev, what);
3570 case PACKET_MR_ALLMULTI:
3571 return dev_set_allmulti(dev, what);
3572 case PACKET_MR_UNICAST:
3573 if (i->alen != dev->addr_len)
3576 return dev_uc_add(dev, i->addr);
3578 return dev_uc_del(dev, i->addr);
3586 static void packet_dev_mclist_delete(struct net_device *dev,
3587 struct packet_mclist **mlp)
3589 struct packet_mclist *ml;
3591 while ((ml = *mlp) != NULL) {
3592 if (ml->ifindex == dev->ifindex) {
3593 packet_dev_mc(dev, ml, -1);
3601 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
3603 struct packet_sock *po = pkt_sk(sk);
3604 struct packet_mclist *ml, *i;
3605 struct net_device *dev;
3611 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
3616 if (mreq->mr_alen > dev->addr_len)
3620 i = kmalloc(sizeof(*i), GFP_KERNEL);
3625 for (ml = po->mclist; ml; ml = ml->next) {
3626 if (ml->ifindex == mreq->mr_ifindex &&
3627 ml->type == mreq->mr_type &&
3628 ml->alen == mreq->mr_alen &&
3629 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3631 /* Free the new element ... */
3637 i->type = mreq->mr_type;
3638 i->ifindex = mreq->mr_ifindex;
3639 i->alen = mreq->mr_alen;
3640 memcpy(i->addr, mreq->mr_address, i->alen);
3641 memset(i->addr + i->alen, 0, sizeof(i->addr) - i->alen);
3643 i->next = po->mclist;
3645 err = packet_dev_mc(dev, i, 1);
3647 po->mclist = i->next;
3656 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
3658 struct packet_mclist *ml, **mlp;
3662 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
3663 if (ml->ifindex == mreq->mr_ifindex &&
3664 ml->type == mreq->mr_type &&
3665 ml->alen == mreq->mr_alen &&
3666 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3667 if (--ml->count == 0) {
3668 struct net_device *dev;
3670 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3672 packet_dev_mc(dev, ml, -1);
3682 static void packet_flush_mclist(struct sock *sk)
3684 struct packet_sock *po = pkt_sk(sk);
3685 struct packet_mclist *ml;
3691 while ((ml = po->mclist) != NULL) {
3692 struct net_device *dev;
3694 po->mclist = ml->next;
3695 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3697 packet_dev_mc(dev, ml, -1);
3704 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
3706 struct sock *sk = sock->sk;
3707 struct packet_sock *po = pkt_sk(sk);
3710 if (level != SOL_PACKET)
3711 return -ENOPROTOOPT;
3714 case PACKET_ADD_MEMBERSHIP:
3715 case PACKET_DROP_MEMBERSHIP:
3717 struct packet_mreq_max mreq;
3719 memset(&mreq, 0, sizeof(mreq));
3720 if (len < sizeof(struct packet_mreq))
3722 if (len > sizeof(mreq))
3724 if (copy_from_user(&mreq, optval, len))
3726 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
3728 if (optname == PACKET_ADD_MEMBERSHIP)
3729 ret = packet_mc_add(sk, &mreq);
3731 ret = packet_mc_drop(sk, &mreq);
3735 case PACKET_RX_RING:
3736 case PACKET_TX_RING:
3738 union tpacket_req_u req_u;
3742 switch (po->tp_version) {
3745 len = sizeof(req_u.req);
3749 len = sizeof(req_u.req3);
3755 if (copy_from_user(&req_u.req, optval, len))
3758 ret = packet_set_ring(sk, &req_u, 0,
3759 optname == PACKET_TX_RING);
3764 case PACKET_COPY_THRESH:
3768 if (optlen != sizeof(val))
3770 if (copy_from_user(&val, optval, sizeof(val)))
3773 pkt_sk(sk)->copy_thresh = val;
3776 case PACKET_VERSION:
3780 if (optlen != sizeof(val))
3782 if (copy_from_user(&val, optval, sizeof(val)))
3793 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3796 po->tp_version = val;
3802 case PACKET_RESERVE:
3806 if (optlen != sizeof(val))
3808 if (copy_from_user(&val, optval, sizeof(val)))
3813 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3816 po->tp_reserve = val;
3826 if (optlen != sizeof(val))
3828 if (copy_from_user(&val, optval, sizeof(val)))
3832 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3835 po->tp_loss = !!val;
3841 case PACKET_AUXDATA:
3845 if (optlen < sizeof(val))
3847 if (copy_from_user(&val, optval, sizeof(val)))
3851 po->auxdata = !!val;
3855 case PACKET_ORIGDEV:
3859 if (optlen < sizeof(val))
3861 if (copy_from_user(&val, optval, sizeof(val)))
3865 po->origdev = !!val;
3869 case PACKET_VNET_HDR:
3873 if (sock->type != SOCK_RAW)
3875 if (optlen < sizeof(val))
3877 if (copy_from_user(&val, optval, sizeof(val)))
3881 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3884 po->has_vnet_hdr = !!val;
3890 case PACKET_TIMESTAMP:
3894 if (optlen != sizeof(val))
3896 if (copy_from_user(&val, optval, sizeof(val)))
3899 po->tp_tstamp = val;
3906 if (optlen != sizeof(val))
3908 if (copy_from_user(&val, optval, sizeof(val)))
3911 return fanout_add(sk, val & 0xffff, val >> 16);
3913 case PACKET_FANOUT_DATA:
3915 /* Paired with the WRITE_ONCE() in fanout_add() */
3916 if (!READ_ONCE(po->fanout))
3919 return fanout_set_data(po, optval, optlen);
3921 case PACKET_TX_HAS_OFF:
3925 if (optlen != sizeof(val))
3927 if (copy_from_user(&val, optval, sizeof(val)))
3931 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3934 po->tp_tx_has_off = !!val;
3940 case PACKET_QDISC_BYPASS:
3944 if (optlen != sizeof(val))
3946 if (copy_from_user(&val, optval, sizeof(val)))
3949 po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
3953 return -ENOPROTOOPT;
3957 static int packet_getsockopt(struct socket *sock, int level, int optname,
3958 char __user *optval, int __user *optlen)
3961 int val, lv = sizeof(val);
3962 struct sock *sk = sock->sk;
3963 struct packet_sock *po = pkt_sk(sk);
3965 union tpacket_stats_u st;
3966 struct tpacket_rollover_stats rstats;
3968 if (level != SOL_PACKET)
3969 return -ENOPROTOOPT;
3971 if (get_user(len, optlen))
3978 case PACKET_STATISTICS:
3979 spin_lock_bh(&sk->sk_receive_queue.lock);
3980 memcpy(&st, &po->stats, sizeof(st));
3981 memset(&po->stats, 0, sizeof(po->stats));
3982 spin_unlock_bh(&sk->sk_receive_queue.lock);
3984 if (po->tp_version == TPACKET_V3) {
3985 lv = sizeof(struct tpacket_stats_v3);
3986 st.stats3.tp_packets += st.stats3.tp_drops;
3989 lv = sizeof(struct tpacket_stats);
3990 st.stats1.tp_packets += st.stats1.tp_drops;
3995 case PACKET_AUXDATA:
3998 case PACKET_ORIGDEV:
4001 case PACKET_VNET_HDR:
4002 val = po->has_vnet_hdr;
4004 case PACKET_VERSION:
4005 val = po->tp_version;
4008 if (len > sizeof(int))
4010 if (len < sizeof(int))
4012 if (copy_from_user(&val, optval, len))
4016 val = sizeof(struct tpacket_hdr);
4019 val = sizeof(struct tpacket2_hdr);
4022 val = sizeof(struct tpacket3_hdr);
4028 case PACKET_RESERVE:
4029 val = po->tp_reserve;
4034 case PACKET_TIMESTAMP:
4035 val = po->tp_tstamp;
4039 ((u32)po->fanout->id |
4040 ((u32)po->fanout->type << 16) |
4041 ((u32)po->fanout->flags << 24)) :
4044 case PACKET_ROLLOVER_STATS:
4047 rstats.tp_all = atomic_long_read(&po->rollover->num);
4048 rstats.tp_huge = atomic_long_read(&po->rollover->num_huge);
4049 rstats.tp_failed = atomic_long_read(&po->rollover->num_failed);
4051 lv = sizeof(rstats);
4053 case PACKET_TX_HAS_OFF:
4054 val = po->tp_tx_has_off;
4056 case PACKET_QDISC_BYPASS:
4057 val = packet_use_direct_xmit(po);
4060 return -ENOPROTOOPT;
4065 if (put_user(len, optlen))
4067 if (copy_to_user(optval, data, len))
4073 #ifdef CONFIG_COMPAT
4074 static int compat_packet_setsockopt(struct socket *sock, int level, int optname,
4075 char __user *optval, unsigned int optlen)
4077 struct packet_sock *po = pkt_sk(sock->sk);
4079 if (level != SOL_PACKET)
4080 return -ENOPROTOOPT;
4082 if (optname == PACKET_FANOUT_DATA &&
4083 po->fanout && po->fanout->type == PACKET_FANOUT_CBPF) {
4084 optval = (char __user *)get_compat_bpf_fprog(optval);
4087 optlen = sizeof(struct sock_fprog);
4090 return packet_setsockopt(sock, level, optname, optval, optlen);
4094 static int packet_notifier(struct notifier_block *this,
4095 unsigned long msg, void *ptr)
4098 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4099 struct net *net = dev_net(dev);
4102 sk_for_each_rcu(sk, &net->packet.sklist) {
4103 struct packet_sock *po = pkt_sk(sk);
4106 case NETDEV_UNREGISTER:
4108 packet_dev_mclist_delete(dev, &po->mclist);
4112 if (dev->ifindex == po->ifindex) {
4113 spin_lock(&po->bind_lock);
4115 __unregister_prot_hook(sk, false);
4116 sk->sk_err = ENETDOWN;
4117 if (!sock_flag(sk, SOCK_DEAD))
4118 sk->sk_error_report(sk);
4120 if (msg == NETDEV_UNREGISTER) {
4121 packet_cached_dev_reset(po);
4122 WRITE_ONCE(po->ifindex, -1);
4123 if (po->prot_hook.dev)
4124 dev_put(po->prot_hook.dev);
4125 po->prot_hook.dev = NULL;
4127 spin_unlock(&po->bind_lock);
4131 if (dev->ifindex == po->ifindex) {
4132 spin_lock(&po->bind_lock);
4134 register_prot_hook(sk);
4135 spin_unlock(&po->bind_lock);
4145 static int packet_ioctl(struct socket *sock, unsigned int cmd,
4148 struct sock *sk = sock->sk;
4153 int amount = sk_wmem_alloc_get(sk);
4155 return put_user(amount, (int __user *)arg);
4159 struct sk_buff *skb;
4162 spin_lock_bh(&sk->sk_receive_queue.lock);
4163 skb = skb_peek(&sk->sk_receive_queue);
4166 spin_unlock_bh(&sk->sk_receive_queue.lock);
4167 return put_user(amount, (int __user *)arg);
4170 return sock_get_timestamp(sk, (struct timeval __user *)arg);
4172 return sock_get_timestampns(sk, (struct timespec __user *)arg);
4182 case SIOCGIFBRDADDR:
4183 case SIOCSIFBRDADDR:
4184 case SIOCGIFNETMASK:
4185 case SIOCSIFNETMASK:
4186 case SIOCGIFDSTADDR:
4187 case SIOCSIFDSTADDR:
4189 return inet_dgram_ops.ioctl(sock, cmd, arg);
4193 return -ENOIOCTLCMD;
4198 static unsigned int packet_poll(struct file *file, struct socket *sock,
4201 struct sock *sk = sock->sk;
4202 struct packet_sock *po = pkt_sk(sk);
4203 unsigned int mask = datagram_poll(file, sock, wait);
4205 spin_lock_bh(&sk->sk_receive_queue.lock);
4206 if (po->rx_ring.pg_vec) {
4207 if (!packet_previous_rx_frame(po, &po->rx_ring,
4209 mask |= POLLIN | POLLRDNORM;
4211 if (po->pressure && __packet_rcv_has_room(po, NULL) == ROOM_NORMAL)
4213 spin_unlock_bh(&sk->sk_receive_queue.lock);
4214 spin_lock_bh(&sk->sk_write_queue.lock);
4215 if (po->tx_ring.pg_vec) {
4216 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
4217 mask |= POLLOUT | POLLWRNORM;
4219 spin_unlock_bh(&sk->sk_write_queue.lock);
4224 /* Dirty? Well, I still did not learn better way to account
4228 static void packet_mm_open(struct vm_area_struct *vma)
4230 struct file *file = vma->vm_file;
4231 struct socket *sock = file->private_data;
4232 struct sock *sk = sock->sk;
4235 atomic_inc(&pkt_sk(sk)->mapped);
4238 static void packet_mm_close(struct vm_area_struct *vma)
4240 struct file *file = vma->vm_file;
4241 struct socket *sock = file->private_data;
4242 struct sock *sk = sock->sk;
4245 atomic_dec(&pkt_sk(sk)->mapped);
4248 static const struct vm_operations_struct packet_mmap_ops = {
4249 .open = packet_mm_open,
4250 .close = packet_mm_close,
4253 static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
4258 for (i = 0; i < len; i++) {
4259 if (likely(pg_vec[i].buffer)) {
4260 if (is_vmalloc_addr(pg_vec[i].buffer))
4261 vfree(pg_vec[i].buffer);
4263 free_pages((unsigned long)pg_vec[i].buffer,
4265 pg_vec[i].buffer = NULL;
4271 static char *alloc_one_pg_vec_page(unsigned long order)
4274 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
4275 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
4277 buffer = (char *) __get_free_pages(gfp_flags, order);
4281 /* __get_free_pages failed, fall back to vmalloc */
4282 buffer = vzalloc((1 << order) * PAGE_SIZE);
4286 /* vmalloc failed, lets dig into swap here */
4287 gfp_flags &= ~__GFP_NORETRY;
4288 buffer = (char *) __get_free_pages(gfp_flags, order);
4292 /* complete and utter failure */
4296 static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
4298 unsigned int block_nr = req->tp_block_nr;
4302 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL | __GFP_NOWARN);
4303 if (unlikely(!pg_vec))
4306 for (i = 0; i < block_nr; i++) {
4307 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
4308 if (unlikely(!pg_vec[i].buffer))
4309 goto out_free_pgvec;
4316 free_pg_vec(pg_vec, order, block_nr);
4321 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
4322 int closing, int tx_ring)
4324 struct pgv *pg_vec = NULL;
4325 struct packet_sock *po = pkt_sk(sk);
4326 int was_running, order = 0;
4327 struct packet_ring_buffer *rb;
4328 struct sk_buff_head *rb_queue;
4331 /* Added to avoid minimal code churn */
4332 struct tpacket_req *req = &req_u->req;
4334 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
4335 if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) {
4336 net_warn_ratelimited("Tx-ring is not supported.\n");
4340 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
4341 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
4345 if (atomic_read(&po->mapped))
4347 if (packet_read_pending(rb))
4351 if (req->tp_block_nr) {
4352 unsigned int min_frame_size;
4354 /* Sanity tests and some calculations */
4356 if (unlikely(rb->pg_vec))
4359 switch (po->tp_version) {
4361 po->tp_hdrlen = TPACKET_HDRLEN;
4364 po->tp_hdrlen = TPACKET2_HDRLEN;
4367 po->tp_hdrlen = TPACKET3_HDRLEN;
4372 if (unlikely((int)req->tp_block_size <= 0))
4374 if (unlikely(!PAGE_ALIGNED(req->tp_block_size)))
4376 min_frame_size = po->tp_hdrlen + po->tp_reserve;
4377 if (po->tp_version >= TPACKET_V3 &&
4378 req->tp_block_size <
4379 BLK_PLUS_PRIV((u64)req_u->req3.tp_sizeof_priv) + min_frame_size)
4381 if (unlikely(req->tp_frame_size < min_frame_size))
4383 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
4386 rb->frames_per_block = req->tp_block_size / req->tp_frame_size;
4387 if (unlikely(rb->frames_per_block == 0))
4389 if (unlikely(rb->frames_per_block > UINT_MAX / req->tp_block_nr))
4391 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
4396 order = get_order(req->tp_block_size);
4397 pg_vec = alloc_pg_vec(req, order);
4398 if (unlikely(!pg_vec))
4400 switch (po->tp_version) {
4402 /* Transmit path is not supported. We checked
4403 * it above but just being paranoid
4406 init_prb_bdqc(po, rb, pg_vec, req_u);
4415 if (unlikely(req->tp_frame_nr))
4420 /* Detach socket from network */
4421 spin_lock(&po->bind_lock);
4422 was_running = po->running;
4425 WRITE_ONCE(po->num, 0);
4426 __unregister_prot_hook(sk, false);
4428 spin_unlock(&po->bind_lock);
4433 mutex_lock(&po->pg_vec_lock);
4434 if (closing || atomic_read(&po->mapped) == 0) {
4436 spin_lock_bh(&rb_queue->lock);
4437 swap(rb->pg_vec, pg_vec);
4438 rb->frame_max = (req->tp_frame_nr - 1);
4440 rb->frame_size = req->tp_frame_size;
4441 spin_unlock_bh(&rb_queue->lock);
4443 swap(rb->pg_vec_order, order);
4444 swap(rb->pg_vec_len, req->tp_block_nr);
4446 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
4447 po->prot_hook.func = (po->rx_ring.pg_vec) ?
4448 tpacket_rcv : packet_rcv;
4449 skb_queue_purge(rb_queue);
4450 if (atomic_read(&po->mapped))
4451 pr_err("packet_mmap: vma is busy: %d\n",
4452 atomic_read(&po->mapped));
4454 mutex_unlock(&po->pg_vec_lock);
4456 spin_lock(&po->bind_lock);
4458 WRITE_ONCE(po->num, num);
4459 register_prot_hook(sk);
4461 spin_unlock(&po->bind_lock);
4462 if (pg_vec && (po->tp_version > TPACKET_V2)) {
4463 /* Because we don't support block-based V3 on tx-ring */
4465 prb_shutdown_retire_blk_timer(po, rb_queue);
4469 free_pg_vec(pg_vec, order, req->tp_block_nr);
4474 static int packet_mmap(struct file *file, struct socket *sock,
4475 struct vm_area_struct *vma)
4477 struct sock *sk = sock->sk;
4478 struct packet_sock *po = pkt_sk(sk);
4479 unsigned long size, expected_size;
4480 struct packet_ring_buffer *rb;
4481 unsigned long start;
4488 mutex_lock(&po->pg_vec_lock);
4491 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4493 expected_size += rb->pg_vec_len
4499 if (expected_size == 0)
4502 size = vma->vm_end - vma->vm_start;
4503 if (size != expected_size)
4506 start = vma->vm_start;
4507 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4508 if (rb->pg_vec == NULL)
4511 for (i = 0; i < rb->pg_vec_len; i++) {
4513 void *kaddr = rb->pg_vec[i].buffer;
4516 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
4517 page = pgv_to_page(kaddr);
4518 err = vm_insert_page(vma, start, page);
4527 atomic_inc(&po->mapped);
4528 vma->vm_ops = &packet_mmap_ops;
4532 mutex_unlock(&po->pg_vec_lock);
4536 static const struct proto_ops packet_ops_spkt = {
4537 .family = PF_PACKET,
4538 .owner = THIS_MODULE,
4539 .release = packet_release,
4540 .bind = packet_bind_spkt,
4541 .connect = sock_no_connect,
4542 .socketpair = sock_no_socketpair,
4543 .accept = sock_no_accept,
4544 .getname = packet_getname_spkt,
4545 .poll = datagram_poll,
4546 .ioctl = packet_ioctl,
4547 .listen = sock_no_listen,
4548 .shutdown = sock_no_shutdown,
4549 .setsockopt = sock_no_setsockopt,
4550 .getsockopt = sock_no_getsockopt,
4551 .sendmsg = packet_sendmsg_spkt,
4552 .recvmsg = packet_recvmsg,
4553 .mmap = sock_no_mmap,
4554 .sendpage = sock_no_sendpage,
4557 static const struct proto_ops packet_ops = {
4558 .family = PF_PACKET,
4559 .owner = THIS_MODULE,
4560 .release = packet_release,
4561 .bind = packet_bind,
4562 .connect = sock_no_connect,
4563 .socketpair = sock_no_socketpair,
4564 .accept = sock_no_accept,
4565 .getname = packet_getname,
4566 .poll = packet_poll,
4567 .ioctl = packet_ioctl,
4568 .listen = sock_no_listen,
4569 .shutdown = sock_no_shutdown,
4570 .setsockopt = packet_setsockopt,
4571 .getsockopt = packet_getsockopt,
4572 #ifdef CONFIG_COMPAT
4573 .compat_setsockopt = compat_packet_setsockopt,
4575 .sendmsg = packet_sendmsg,
4576 .recvmsg = packet_recvmsg,
4577 .mmap = packet_mmap,
4578 .sendpage = sock_no_sendpage,
4581 static const struct net_proto_family packet_family_ops = {
4582 .family = PF_PACKET,
4583 .create = packet_create,
4584 .owner = THIS_MODULE,
4587 static struct notifier_block packet_netdev_notifier = {
4588 .notifier_call = packet_notifier,
4591 #ifdef CONFIG_PROC_FS
4593 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
4596 struct net *net = seq_file_net(seq);
4599 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
4602 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4604 struct net *net = seq_file_net(seq);
4605 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
4608 static void packet_seq_stop(struct seq_file *seq, void *v)
4614 static int packet_seq_show(struct seq_file *seq, void *v)
4616 if (v == SEQ_START_TOKEN)
4617 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4619 struct sock *s = sk_entry(v);
4620 const struct packet_sock *po = pkt_sk(s);
4623 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
4625 atomic_read(&s->sk_refcnt),
4627 ntohs(READ_ONCE(po->num)),
4628 READ_ONCE(po->ifindex),
4630 atomic_read(&s->sk_rmem_alloc),
4631 from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)),
4638 static const struct seq_operations packet_seq_ops = {
4639 .start = packet_seq_start,
4640 .next = packet_seq_next,
4641 .stop = packet_seq_stop,
4642 .show = packet_seq_show,
4645 static int packet_seq_open(struct inode *inode, struct file *file)
4647 return seq_open_net(inode, file, &packet_seq_ops,
4648 sizeof(struct seq_net_private));
4651 static const struct file_operations packet_seq_fops = {
4652 .owner = THIS_MODULE,
4653 .open = packet_seq_open,
4655 .llseek = seq_lseek,
4656 .release = seq_release_net,
4661 static int __net_init packet_net_init(struct net *net)
4663 mutex_init(&net->packet.sklist_lock);
4664 INIT_HLIST_HEAD(&net->packet.sklist);
4666 if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops))
4672 static void __net_exit packet_net_exit(struct net *net)
4674 remove_proc_entry("packet", net->proc_net);
4677 static struct pernet_operations packet_net_ops = {
4678 .init = packet_net_init,
4679 .exit = packet_net_exit,
4683 static void __exit packet_exit(void)
4685 unregister_netdevice_notifier(&packet_netdev_notifier);
4686 unregister_pernet_subsys(&packet_net_ops);
4687 sock_unregister(PF_PACKET);
4688 proto_unregister(&packet_proto);
4691 static int __init packet_init(void)
4695 rc = proto_register(&packet_proto, 0);
4698 rc = sock_register(&packet_family_ops);
4701 rc = register_pernet_subsys(&packet_net_ops);
4704 rc = register_netdevice_notifier(&packet_netdev_notifier);
4711 unregister_pernet_subsys(&packet_net_ops);
4713 sock_unregister(PF_PACKET);
4715 proto_unregister(&packet_proto);
4720 module_init(packet_init);
4721 module_exit(packet_exit);
4722 MODULE_LICENSE("GPL");
4723 MODULE_ALIAS_NETPROTO(PF_PACKET);