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>
100 - if device has no dev->hard_header routine, it adds and removes ll header
101 inside itself. In this case ll header is invisible outside of device,
102 but higher levels still should reserve dev->hard_header_len.
103 Some devices are enough clever to reallocate skb, when header
104 will not fit to reserved space (tunnel), another ones are silly
106 - packet socket receives packets with pulled ll header,
107 so that SOCK_RAW should push it back.
112 Incoming, dev->hard_header!=NULL
113 mac_header -> ll header
116 Outgoing, dev->hard_header!=NULL
117 mac_header -> ll header
120 Incoming, dev->hard_header==NULL
121 mac_header -> UNKNOWN position. It is very likely, that it points to ll
122 header. PPP makes it, that is wrong, because introduce
123 assymetry between rx and tx paths.
126 Outgoing, dev->hard_header==NULL
127 mac_header -> data. ll header is still not built!
131 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
137 dev->hard_header != NULL
138 mac_header -> ll header
141 dev->hard_header == NULL (ll header is added by device, we cannot control it)
145 We should set nh.raw on output to correct posistion,
146 packet classifier depends on it.
149 /* Private packet socket structures. */
151 /* identical to struct packet_mreq except it has
152 * a longer address field.
154 struct packet_mreq_max
{
156 unsigned short mr_type
;
157 unsigned short mr_alen
;
158 unsigned char mr_address
[MAX_ADDR_LEN
];
162 struct tpacket_hdr
*h1
;
163 struct tpacket2_hdr
*h2
;
164 struct tpacket3_hdr
*h3
;
168 static int packet_set_ring(struct sock
*sk
, union tpacket_req_u
*req_u
,
169 int closing
, int tx_ring
);
171 #define V3_ALIGNMENT (8)
173 #define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT))
175 #define BLK_PLUS_PRIV(sz_of_priv) \
176 (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT))
178 #define PGV_FROM_VMALLOC 1
180 #define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status)
181 #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts)
182 #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt)
183 #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len)
184 #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num)
185 #define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
186 #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x)))
189 static int tpacket_snd(struct packet_sock
*po
, struct msghdr
*msg
);
190 static int tpacket_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
191 struct packet_type
*pt
, struct net_device
*orig_dev
);
193 static void *packet_previous_frame(struct packet_sock
*po
,
194 struct packet_ring_buffer
*rb
,
196 static void packet_increment_head(struct packet_ring_buffer
*buff
);
197 static int prb_curr_blk_in_use(struct tpacket_kbdq_core
*,
198 struct tpacket_block_desc
*);
199 static void *prb_dispatch_next_block(struct tpacket_kbdq_core
*,
200 struct packet_sock
*);
201 static void prb_retire_current_block(struct tpacket_kbdq_core
*,
202 struct packet_sock
*, unsigned int status
);
203 static int prb_queue_frozen(struct tpacket_kbdq_core
*);
204 static void prb_open_block(struct tpacket_kbdq_core
*,
205 struct tpacket_block_desc
*);
206 static void prb_retire_rx_blk_timer_expired(unsigned long);
207 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core
*);
208 static void prb_init_blk_timer(struct packet_sock
*,
209 struct tpacket_kbdq_core
*,
210 void (*func
) (unsigned long));
211 static void prb_fill_rxhash(struct tpacket_kbdq_core
*, struct tpacket3_hdr
*);
212 static void prb_clear_rxhash(struct tpacket_kbdq_core
*,
213 struct tpacket3_hdr
*);
214 static void prb_fill_vlan_info(struct tpacket_kbdq_core
*,
215 struct tpacket3_hdr
*);
216 static void packet_flush_mclist(struct sock
*sk
);
218 struct packet_skb_cb
{
220 struct sockaddr_pkt pkt
;
222 /* Trick: alias skb original length with
223 * ll.sll_family and ll.protocol in order
226 unsigned int origlen
;
227 struct sockaddr_ll ll
;
232 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
234 #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
235 #define GET_PBLOCK_DESC(x, bid) \
236 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
237 #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
238 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
239 #define GET_NEXT_PRB_BLK_NUM(x) \
240 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
241 ((x)->kactive_blk_num+1) : 0)
243 static void __fanout_unlink(struct sock
*sk
, struct packet_sock
*po
);
244 static void __fanout_link(struct sock
*sk
, struct packet_sock
*po
);
246 static int packet_direct_xmit(struct sk_buff
*skb
)
248 struct net_device
*dev
= skb
->dev
;
249 netdev_features_t features
;
250 struct netdev_queue
*txq
;
251 int ret
= NETDEV_TX_BUSY
;
253 if (unlikely(!netif_running(dev
) ||
254 !netif_carrier_ok(dev
)))
257 features
= netif_skb_features(skb
);
258 if (skb_needs_linearize(skb
, features
) &&
259 __skb_linearize(skb
))
262 txq
= skb_get_tx_queue(dev
, skb
);
266 HARD_TX_LOCK(dev
, txq
, smp_processor_id());
267 if (!netif_xmit_frozen_or_drv_stopped(txq
))
268 ret
= netdev_start_xmit(skb
, dev
, txq
, false);
269 HARD_TX_UNLOCK(dev
, txq
);
273 if (!dev_xmit_complete(ret
))
278 atomic_long_inc(&dev
->tx_dropped
);
280 return NET_XMIT_DROP
;
283 static struct net_device
*packet_cached_dev_get(struct packet_sock
*po
)
285 struct net_device
*dev
;
288 dev
= rcu_dereference(po
->cached_dev
);
296 static void packet_cached_dev_assign(struct packet_sock
*po
,
297 struct net_device
*dev
)
299 rcu_assign_pointer(po
->cached_dev
, dev
);
302 static void packet_cached_dev_reset(struct packet_sock
*po
)
304 RCU_INIT_POINTER(po
->cached_dev
, NULL
);
307 static bool packet_use_direct_xmit(const struct packet_sock
*po
)
309 return po
->xmit
== packet_direct_xmit
;
312 static u16
__packet_pick_tx_queue(struct net_device
*dev
, struct sk_buff
*skb
)
314 return (u16
) raw_smp_processor_id() % dev
->real_num_tx_queues
;
317 static void packet_pick_tx_queue(struct net_device
*dev
, struct sk_buff
*skb
)
319 const struct net_device_ops
*ops
= dev
->netdev_ops
;
322 if (ops
->ndo_select_queue
) {
323 queue_index
= ops
->ndo_select_queue(dev
, skb
, NULL
,
324 __packet_pick_tx_queue
);
325 queue_index
= netdev_cap_txqueue(dev
, queue_index
);
327 queue_index
= __packet_pick_tx_queue(dev
, skb
);
330 skb_set_queue_mapping(skb
, queue_index
);
333 /* register_prot_hook must be invoked with the po->bind_lock held,
334 * or from a context in which asynchronous accesses to the packet
335 * socket is not possible (packet_create()).
337 static void register_prot_hook(struct sock
*sk
)
339 struct packet_sock
*po
= pkt_sk(sk
);
343 __fanout_link(sk
, po
);
345 dev_add_pack(&po
->prot_hook
);
352 /* {,__}unregister_prot_hook() must be invoked with the po->bind_lock
353 * held. If the sync parameter is true, we will temporarily drop
354 * the po->bind_lock and do a synchronize_net to make sure no
355 * asynchronous packet processing paths still refer to the elements
356 * of po->prot_hook. If the sync parameter is false, it is the
357 * callers responsibility to take care of this.
359 static void __unregister_prot_hook(struct sock
*sk
, bool sync
)
361 struct packet_sock
*po
= pkt_sk(sk
);
366 __fanout_unlink(sk
, po
);
368 __dev_remove_pack(&po
->prot_hook
);
373 spin_unlock(&po
->bind_lock
);
375 spin_lock(&po
->bind_lock
);
379 static void unregister_prot_hook(struct sock
*sk
, bool sync
)
381 struct packet_sock
*po
= pkt_sk(sk
);
384 __unregister_prot_hook(sk
, sync
);
387 static inline struct page
* __pure
pgv_to_page(void *addr
)
389 if (is_vmalloc_addr(addr
))
390 return vmalloc_to_page(addr
);
391 return virt_to_page(addr
);
394 static void __packet_set_status(struct packet_sock
*po
, void *frame
, int status
)
396 union tpacket_uhdr h
;
399 switch (po
->tp_version
) {
401 h
.h1
->tp_status
= status
;
402 flush_dcache_page(pgv_to_page(&h
.h1
->tp_status
));
405 h
.h2
->tp_status
= status
;
406 flush_dcache_page(pgv_to_page(&h
.h2
->tp_status
));
410 WARN(1, "TPACKET version not supported.\n");
417 static int __packet_get_status(struct packet_sock
*po
, void *frame
)
419 union tpacket_uhdr h
;
424 switch (po
->tp_version
) {
426 flush_dcache_page(pgv_to_page(&h
.h1
->tp_status
));
427 return h
.h1
->tp_status
;
429 flush_dcache_page(pgv_to_page(&h
.h2
->tp_status
));
430 return h
.h2
->tp_status
;
433 WARN(1, "TPACKET version not supported.\n");
439 static __u32
tpacket_get_timestamp(struct sk_buff
*skb
, struct timespec
*ts
,
442 struct skb_shared_hwtstamps
*shhwtstamps
= skb_hwtstamps(skb
);
445 (flags
& SOF_TIMESTAMPING_RAW_HARDWARE
) &&
446 ktime_to_timespec_cond(shhwtstamps
->hwtstamp
, ts
))
447 return TP_STATUS_TS_RAW_HARDWARE
;
449 if (ktime_to_timespec_cond(skb
->tstamp
, ts
))
450 return TP_STATUS_TS_SOFTWARE
;
455 static __u32
__packet_set_timestamp(struct packet_sock
*po
, void *frame
,
458 union tpacket_uhdr h
;
462 if (!(ts_status
= tpacket_get_timestamp(skb
, &ts
, po
->tp_tstamp
)))
466 switch (po
->tp_version
) {
468 h
.h1
->tp_sec
= ts
.tv_sec
;
469 h
.h1
->tp_usec
= ts
.tv_nsec
/ NSEC_PER_USEC
;
472 h
.h2
->tp_sec
= ts
.tv_sec
;
473 h
.h2
->tp_nsec
= ts
.tv_nsec
;
477 WARN(1, "TPACKET version not supported.\n");
481 /* one flush is safe, as both fields always lie on the same cacheline */
482 flush_dcache_page(pgv_to_page(&h
.h1
->tp_sec
));
488 static void *packet_lookup_frame(struct packet_sock
*po
,
489 struct packet_ring_buffer
*rb
,
490 unsigned int position
,
493 unsigned int pg_vec_pos
, frame_offset
;
494 union tpacket_uhdr h
;
496 pg_vec_pos
= position
/ rb
->frames_per_block
;
497 frame_offset
= position
% rb
->frames_per_block
;
499 h
.raw
= rb
->pg_vec
[pg_vec_pos
].buffer
+
500 (frame_offset
* rb
->frame_size
);
502 if (status
!= __packet_get_status(po
, h
.raw
))
508 static void *packet_current_frame(struct packet_sock
*po
,
509 struct packet_ring_buffer
*rb
,
512 return packet_lookup_frame(po
, rb
, rb
->head
, status
);
515 static void prb_del_retire_blk_timer(struct tpacket_kbdq_core
*pkc
)
517 del_timer_sync(&pkc
->retire_blk_timer
);
520 static void prb_shutdown_retire_blk_timer(struct packet_sock
*po
,
522 struct sk_buff_head
*rb_queue
)
524 struct tpacket_kbdq_core
*pkc
;
526 pkc
= tx_ring
? GET_PBDQC_FROM_RB(&po
->tx_ring
) :
527 GET_PBDQC_FROM_RB(&po
->rx_ring
);
529 spin_lock_bh(&rb_queue
->lock
);
530 pkc
->delete_blk_timer
= 1;
531 spin_unlock_bh(&rb_queue
->lock
);
533 prb_del_retire_blk_timer(pkc
);
536 static void prb_init_blk_timer(struct packet_sock
*po
,
537 struct tpacket_kbdq_core
*pkc
,
538 void (*func
) (unsigned long))
540 init_timer(&pkc
->retire_blk_timer
);
541 pkc
->retire_blk_timer
.data
= (long)po
;
542 pkc
->retire_blk_timer
.function
= func
;
543 pkc
->retire_blk_timer
.expires
= jiffies
;
546 static void prb_setup_retire_blk_timer(struct packet_sock
*po
, int tx_ring
)
548 struct tpacket_kbdq_core
*pkc
;
553 pkc
= tx_ring
? GET_PBDQC_FROM_RB(&po
->tx_ring
) :
554 GET_PBDQC_FROM_RB(&po
->rx_ring
);
555 prb_init_blk_timer(po
, pkc
, prb_retire_rx_blk_timer_expired
);
558 static int prb_calc_retire_blk_tmo(struct packet_sock
*po
,
559 int blk_size_in_bytes
)
561 struct net_device
*dev
;
562 unsigned int mbits
= 0, msec
= 0, div
= 0, tmo
= 0;
563 struct ethtool_cmd ecmd
;
568 dev
= __dev_get_by_index(sock_net(&po
->sk
), po
->ifindex
);
569 if (unlikely(!dev
)) {
571 return DEFAULT_PRB_RETIRE_TOV
;
573 err
= __ethtool_get_settings(dev
, &ecmd
);
574 speed
= ethtool_cmd_speed(&ecmd
);
578 * If the link speed is so slow you don't really
579 * need to worry about perf anyways
581 if (speed
< SPEED_1000
|| speed
== SPEED_UNKNOWN
) {
582 return DEFAULT_PRB_RETIRE_TOV
;
589 mbits
= (blk_size_in_bytes
* 8) / (1024 * 1024);
601 static void prb_init_ft_ops(struct tpacket_kbdq_core
*p1
,
602 union tpacket_req_u
*req_u
)
604 p1
->feature_req_word
= req_u
->req3
.tp_feature_req_word
;
607 static void init_prb_bdqc(struct packet_sock
*po
,
608 struct packet_ring_buffer
*rb
,
610 union tpacket_req_u
*req_u
, int tx_ring
)
612 struct tpacket_kbdq_core
*p1
= GET_PBDQC_FROM_RB(rb
);
613 struct tpacket_block_desc
*pbd
;
615 memset(p1
, 0x0, sizeof(*p1
));
617 p1
->knxt_seq_num
= 1;
619 pbd
= (struct tpacket_block_desc
*)pg_vec
[0].buffer
;
620 p1
->pkblk_start
= pg_vec
[0].buffer
;
621 p1
->kblk_size
= req_u
->req3
.tp_block_size
;
622 p1
->knum_blocks
= req_u
->req3
.tp_block_nr
;
623 p1
->hdrlen
= po
->tp_hdrlen
;
624 p1
->version
= po
->tp_version
;
625 p1
->last_kactive_blk_num
= 0;
626 po
->stats
.stats3
.tp_freeze_q_cnt
= 0;
627 if (req_u
->req3
.tp_retire_blk_tov
)
628 p1
->retire_blk_tov
= req_u
->req3
.tp_retire_blk_tov
;
630 p1
->retire_blk_tov
= prb_calc_retire_blk_tmo(po
,
631 req_u
->req3
.tp_block_size
);
632 p1
->tov_in_jiffies
= msecs_to_jiffies(p1
->retire_blk_tov
);
633 p1
->blk_sizeof_priv
= req_u
->req3
.tp_sizeof_priv
;
635 p1
->max_frame_len
= p1
->kblk_size
- BLK_PLUS_PRIV(p1
->blk_sizeof_priv
);
636 prb_init_ft_ops(p1
, req_u
);
637 prb_setup_retire_blk_timer(po
, tx_ring
);
638 prb_open_block(p1
, pbd
);
641 /* Do NOT update the last_blk_num first.
642 * Assumes sk_buff_head lock is held.
644 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core
*pkc
)
646 mod_timer(&pkc
->retire_blk_timer
,
647 jiffies
+ pkc
->tov_in_jiffies
);
648 pkc
->last_kactive_blk_num
= pkc
->kactive_blk_num
;
653 * 1) We refresh the timer only when we open a block.
654 * By doing this we don't waste cycles refreshing the timer
655 * on packet-by-packet basis.
657 * With a 1MB block-size, on a 1Gbps line, it will take
658 * i) ~8 ms to fill a block + ii) memcpy etc.
659 * In this cut we are not accounting for the memcpy time.
661 * So, if the user sets the 'tmo' to 10ms then the timer
662 * will never fire while the block is still getting filled
663 * (which is what we want). However, the user could choose
664 * to close a block early and that's fine.
666 * But when the timer does fire, we check whether or not to refresh it.
667 * Since the tmo granularity is in msecs, it is not too expensive
668 * to refresh the timer, lets say every '8' msecs.
669 * Either the user can set the 'tmo' or we can derive it based on
670 * a) line-speed and b) block-size.
671 * prb_calc_retire_blk_tmo() calculates the tmo.
674 static void prb_retire_rx_blk_timer_expired(unsigned long data
)
676 struct packet_sock
*po
= (struct packet_sock
*)data
;
677 struct tpacket_kbdq_core
*pkc
= GET_PBDQC_FROM_RB(&po
->rx_ring
);
679 struct tpacket_block_desc
*pbd
;
681 spin_lock(&po
->sk
.sk_receive_queue
.lock
);
683 frozen
= prb_queue_frozen(pkc
);
684 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
686 if (unlikely(pkc
->delete_blk_timer
))
689 /* We only need to plug the race when the block is partially filled.
691 * lock(); increment BLOCK_NUM_PKTS; unlock()
692 * copy_bits() is in progress ...
693 * timer fires on other cpu:
694 * we can't retire the current block because copy_bits
698 if (BLOCK_NUM_PKTS(pbd
)) {
699 while (atomic_read(&pkc
->blk_fill_in_prog
)) {
700 /* Waiting for skb_copy_bits to finish... */
705 if (pkc
->last_kactive_blk_num
== pkc
->kactive_blk_num
) {
707 if (!BLOCK_NUM_PKTS(pbd
)) {
708 /* An empty block. Just refresh the timer. */
711 prb_retire_current_block(pkc
, po
, TP_STATUS_BLK_TMO
);
712 if (!prb_dispatch_next_block(pkc
, po
))
717 /* Case 1. Queue was frozen because user-space was
720 if (prb_curr_blk_in_use(pkc
, pbd
)) {
722 * Ok, user-space is still behind.
723 * So just refresh the timer.
727 /* Case 2. queue was frozen,user-space caught up,
728 * now the link went idle && the timer fired.
729 * We don't have a block to close.So we open this
730 * block and restart the timer.
731 * opening a block thaws the queue,restarts timer
732 * Thawing/timer-refresh is a side effect.
734 prb_open_block(pkc
, pbd
);
741 _prb_refresh_rx_retire_blk_timer(pkc
);
744 spin_unlock(&po
->sk
.sk_receive_queue
.lock
);
747 static void prb_flush_block(struct tpacket_kbdq_core
*pkc1
,
748 struct tpacket_block_desc
*pbd1
, __u32 status
)
750 /* Flush everything minus the block header */
752 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
757 /* Skip the block header(we know header WILL fit in 4K) */
760 end
= (u8
*)PAGE_ALIGN((unsigned long)pkc1
->pkblk_end
);
761 for (; start
< end
; start
+= PAGE_SIZE
)
762 flush_dcache_page(pgv_to_page(start
));
767 /* Now update the block status. */
769 BLOCK_STATUS(pbd1
) = status
;
771 /* Flush the block header */
773 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
775 flush_dcache_page(pgv_to_page(start
));
785 * 2) Increment active_blk_num
787 * Note:We DONT refresh the timer on purpose.
788 * Because almost always the next block will be opened.
790 static void prb_close_block(struct tpacket_kbdq_core
*pkc1
,
791 struct tpacket_block_desc
*pbd1
,
792 struct packet_sock
*po
, unsigned int stat
)
794 __u32 status
= TP_STATUS_USER
| stat
;
796 struct tpacket3_hdr
*last_pkt
;
797 struct tpacket_hdr_v1
*h1
= &pbd1
->hdr
.bh1
;
798 struct sock
*sk
= &po
->sk
;
800 if (po
->stats
.stats3
.tp_drops
)
801 status
|= TP_STATUS_LOSING
;
803 last_pkt
= (struct tpacket3_hdr
*)pkc1
->prev
;
804 last_pkt
->tp_next_offset
= 0;
806 /* Get the ts of the last pkt */
807 if (BLOCK_NUM_PKTS(pbd1
)) {
808 h1
->ts_last_pkt
.ts_sec
= last_pkt
->tp_sec
;
809 h1
->ts_last_pkt
.ts_nsec
= last_pkt
->tp_nsec
;
811 /* Ok, we tmo'd - so get the current time.
813 * It shouldn't really happen as we don't close empty
814 * blocks. See prb_retire_rx_blk_timer_expired().
818 h1
->ts_last_pkt
.ts_sec
= ts
.tv_sec
;
819 h1
->ts_last_pkt
.ts_nsec
= ts
.tv_nsec
;
824 /* Flush the block */
825 prb_flush_block(pkc1
, pbd1
, status
);
827 sk
->sk_data_ready(sk
);
829 pkc1
->kactive_blk_num
= GET_NEXT_PRB_BLK_NUM(pkc1
);
832 static void prb_thaw_queue(struct tpacket_kbdq_core
*pkc
)
834 pkc
->reset_pending_on_curr_blk
= 0;
838 * Side effect of opening a block:
840 * 1) prb_queue is thawed.
841 * 2) retire_blk_timer is refreshed.
844 static void prb_open_block(struct tpacket_kbdq_core
*pkc1
,
845 struct tpacket_block_desc
*pbd1
)
848 struct tpacket_hdr_v1
*h1
= &pbd1
->hdr
.bh1
;
852 /* We could have just memset this but we will lose the
853 * flexibility of making the priv area sticky
856 BLOCK_SNUM(pbd1
) = pkc1
->knxt_seq_num
++;
857 BLOCK_NUM_PKTS(pbd1
) = 0;
858 BLOCK_LEN(pbd1
) = BLK_PLUS_PRIV(pkc1
->blk_sizeof_priv
);
862 h1
->ts_first_pkt
.ts_sec
= ts
.tv_sec
;
863 h1
->ts_first_pkt
.ts_nsec
= ts
.tv_nsec
;
865 pkc1
->pkblk_start
= (char *)pbd1
;
866 pkc1
->nxt_offset
= pkc1
->pkblk_start
+ BLK_PLUS_PRIV(pkc1
->blk_sizeof_priv
);
868 BLOCK_O2FP(pbd1
) = (__u32
)BLK_PLUS_PRIV(pkc1
->blk_sizeof_priv
);
869 BLOCK_O2PRIV(pbd1
) = BLK_HDR_LEN
;
871 pbd1
->version
= pkc1
->version
;
872 pkc1
->prev
= pkc1
->nxt_offset
;
873 pkc1
->pkblk_end
= pkc1
->pkblk_start
+ pkc1
->kblk_size
;
875 prb_thaw_queue(pkc1
);
876 _prb_refresh_rx_retire_blk_timer(pkc1
);
882 * Queue freeze logic:
883 * 1) Assume tp_block_nr = 8 blocks.
884 * 2) At time 't0', user opens Rx ring.
885 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
886 * 4) user-space is either sleeping or processing block '0'.
887 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
888 * it will close block-7,loop around and try to fill block '0'.
890 * __packet_lookup_frame_in_block
891 * prb_retire_current_block()
892 * prb_dispatch_next_block()
893 * |->(BLOCK_STATUS == USER) evaluates to true
894 * 5.1) Since block-0 is currently in-use, we just freeze the queue.
895 * 6) Now there are two cases:
896 * 6.1) Link goes idle right after the queue is frozen.
897 * But remember, the last open_block() refreshed the timer.
898 * When this timer expires,it will refresh itself so that we can
899 * re-open block-0 in near future.
900 * 6.2) Link is busy and keeps on receiving packets. This is a simple
901 * case and __packet_lookup_frame_in_block will check if block-0
902 * is free and can now be re-used.
904 static void prb_freeze_queue(struct tpacket_kbdq_core
*pkc
,
905 struct packet_sock
*po
)
907 pkc
->reset_pending_on_curr_blk
= 1;
908 po
->stats
.stats3
.tp_freeze_q_cnt
++;
911 #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
914 * If the next block is free then we will dispatch it
915 * and return a good offset.
916 * Else, we will freeze the queue.
917 * So, caller must check the return value.
919 static void *prb_dispatch_next_block(struct tpacket_kbdq_core
*pkc
,
920 struct packet_sock
*po
)
922 struct tpacket_block_desc
*pbd
;
926 /* 1. Get current block num */
927 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
929 /* 2. If this block is currently in_use then freeze the queue */
930 if (TP_STATUS_USER
& BLOCK_STATUS(pbd
)) {
931 prb_freeze_queue(pkc
, po
);
937 * open this block and return the offset where the first packet
938 * needs to get stored.
940 prb_open_block(pkc
, pbd
);
941 return (void *)pkc
->nxt_offset
;
944 static void prb_retire_current_block(struct tpacket_kbdq_core
*pkc
,
945 struct packet_sock
*po
, unsigned int status
)
947 struct tpacket_block_desc
*pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
949 /* retire/close the current block */
950 if (likely(TP_STATUS_KERNEL
== BLOCK_STATUS(pbd
))) {
952 * Plug the case where copy_bits() is in progress on
953 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
954 * have space to copy the pkt in the current block and
955 * called prb_retire_current_block()
957 * We don't need to worry about the TMO case because
958 * the timer-handler already handled this case.
960 if (!(status
& TP_STATUS_BLK_TMO
)) {
961 while (atomic_read(&pkc
->blk_fill_in_prog
)) {
962 /* Waiting for skb_copy_bits to finish... */
966 prb_close_block(pkc
, pbd
, po
, status
);
971 static int prb_curr_blk_in_use(struct tpacket_kbdq_core
*pkc
,
972 struct tpacket_block_desc
*pbd
)
974 return TP_STATUS_USER
& BLOCK_STATUS(pbd
);
977 static int prb_queue_frozen(struct tpacket_kbdq_core
*pkc
)
979 return pkc
->reset_pending_on_curr_blk
;
982 static void prb_clear_blk_fill_status(struct packet_ring_buffer
*rb
)
984 struct tpacket_kbdq_core
*pkc
= GET_PBDQC_FROM_RB(rb
);
985 atomic_dec(&pkc
->blk_fill_in_prog
);
988 static void prb_fill_rxhash(struct tpacket_kbdq_core
*pkc
,
989 struct tpacket3_hdr
*ppd
)
991 ppd
->hv1
.tp_rxhash
= skb_get_hash(pkc
->skb
);
994 static void prb_clear_rxhash(struct tpacket_kbdq_core
*pkc
,
995 struct tpacket3_hdr
*ppd
)
997 ppd
->hv1
.tp_rxhash
= 0;
1000 static void prb_fill_vlan_info(struct tpacket_kbdq_core
*pkc
,
1001 struct tpacket3_hdr
*ppd
)
1003 if (skb_vlan_tag_present(pkc
->skb
)) {
1004 ppd
->hv1
.tp_vlan_tci
= skb_vlan_tag_get(pkc
->skb
);
1005 ppd
->hv1
.tp_vlan_tpid
= ntohs(pkc
->skb
->vlan_proto
);
1006 ppd
->tp_status
= TP_STATUS_VLAN_VALID
| TP_STATUS_VLAN_TPID_VALID
;
1008 ppd
->hv1
.tp_vlan_tci
= 0;
1009 ppd
->hv1
.tp_vlan_tpid
= 0;
1010 ppd
->tp_status
= TP_STATUS_AVAILABLE
;
1014 static void prb_run_all_ft_ops(struct tpacket_kbdq_core
*pkc
,
1015 struct tpacket3_hdr
*ppd
)
1017 ppd
->hv1
.tp_padding
= 0;
1018 prb_fill_vlan_info(pkc
, ppd
);
1020 if (pkc
->feature_req_word
& TP_FT_REQ_FILL_RXHASH
)
1021 prb_fill_rxhash(pkc
, ppd
);
1023 prb_clear_rxhash(pkc
, ppd
);
1026 static void prb_fill_curr_block(char *curr
,
1027 struct tpacket_kbdq_core
*pkc
,
1028 struct tpacket_block_desc
*pbd
,
1031 struct tpacket3_hdr
*ppd
;
1033 ppd
= (struct tpacket3_hdr
*)curr
;
1034 ppd
->tp_next_offset
= TOTAL_PKT_LEN_INCL_ALIGN(len
);
1036 pkc
->nxt_offset
+= TOTAL_PKT_LEN_INCL_ALIGN(len
);
1037 BLOCK_LEN(pbd
) += TOTAL_PKT_LEN_INCL_ALIGN(len
);
1038 BLOCK_NUM_PKTS(pbd
) += 1;
1039 atomic_inc(&pkc
->blk_fill_in_prog
);
1040 prb_run_all_ft_ops(pkc
, ppd
);
1043 /* Assumes caller has the sk->rx_queue.lock */
1044 static void *__packet_lookup_frame_in_block(struct packet_sock
*po
,
1045 struct sk_buff
*skb
,
1050 struct tpacket_kbdq_core
*pkc
;
1051 struct tpacket_block_desc
*pbd
;
1054 pkc
= GET_PBDQC_FROM_RB(&po
->rx_ring
);
1055 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
1057 /* Queue is frozen when user space is lagging behind */
1058 if (prb_queue_frozen(pkc
)) {
1060 * Check if that last block which caused the queue to freeze,
1061 * is still in_use by user-space.
1063 if (prb_curr_blk_in_use(pkc
, pbd
)) {
1064 /* Can't record this packet */
1068 * Ok, the block was released by user-space.
1069 * Now let's open that block.
1070 * opening a block also thaws the queue.
1071 * Thawing is a side effect.
1073 prb_open_block(pkc
, pbd
);
1078 curr
= pkc
->nxt_offset
;
1080 end
= (char *)pbd
+ pkc
->kblk_size
;
1082 /* first try the current block */
1083 if (curr
+TOTAL_PKT_LEN_INCL_ALIGN(len
) < end
) {
1084 prb_fill_curr_block(curr
, pkc
, pbd
, len
);
1085 return (void *)curr
;
1088 /* Ok, close the current block */
1089 prb_retire_current_block(pkc
, po
, 0);
1091 /* Now, try to dispatch the next block */
1092 curr
= (char *)prb_dispatch_next_block(pkc
, po
);
1094 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
1095 prb_fill_curr_block(curr
, pkc
, pbd
, len
);
1096 return (void *)curr
;
1100 * No free blocks are available.user_space hasn't caught up yet.
1101 * Queue was just frozen and now this packet will get dropped.
1106 static void *packet_current_rx_frame(struct packet_sock
*po
,
1107 struct sk_buff
*skb
,
1108 int status
, unsigned int len
)
1111 switch (po
->tp_version
) {
1114 curr
= packet_lookup_frame(po
, &po
->rx_ring
,
1115 po
->rx_ring
.head
, status
);
1118 return __packet_lookup_frame_in_block(po
, skb
, status
, len
);
1120 WARN(1, "TPACKET version not supported\n");
1126 static void *prb_lookup_block(struct packet_sock
*po
,
1127 struct packet_ring_buffer
*rb
,
1131 struct tpacket_kbdq_core
*pkc
= GET_PBDQC_FROM_RB(rb
);
1132 struct tpacket_block_desc
*pbd
= GET_PBLOCK_DESC(pkc
, idx
);
1134 if (status
!= BLOCK_STATUS(pbd
))
1139 static int prb_previous_blk_num(struct packet_ring_buffer
*rb
)
1142 if (rb
->prb_bdqc
.kactive_blk_num
)
1143 prev
= rb
->prb_bdqc
.kactive_blk_num
-1;
1145 prev
= rb
->prb_bdqc
.knum_blocks
-1;
1149 /* Assumes caller has held the rx_queue.lock */
1150 static void *__prb_previous_block(struct packet_sock
*po
,
1151 struct packet_ring_buffer
*rb
,
1154 unsigned int previous
= prb_previous_blk_num(rb
);
1155 return prb_lookup_block(po
, rb
, previous
, status
);
1158 static void *packet_previous_rx_frame(struct packet_sock
*po
,
1159 struct packet_ring_buffer
*rb
,
1162 if (po
->tp_version
<= TPACKET_V2
)
1163 return packet_previous_frame(po
, rb
, status
);
1165 return __prb_previous_block(po
, rb
, status
);
1168 static void packet_increment_rx_head(struct packet_sock
*po
,
1169 struct packet_ring_buffer
*rb
)
1171 switch (po
->tp_version
) {
1174 return packet_increment_head(rb
);
1177 WARN(1, "TPACKET version not supported.\n");
1183 static void *packet_previous_frame(struct packet_sock
*po
,
1184 struct packet_ring_buffer
*rb
,
1187 unsigned int previous
= rb
->head
? rb
->head
- 1 : rb
->frame_max
;
1188 return packet_lookup_frame(po
, rb
, previous
, status
);
1191 static void packet_increment_head(struct packet_ring_buffer
*buff
)
1193 buff
->head
= buff
->head
!= buff
->frame_max
? buff
->head
+1 : 0;
1196 static void packet_inc_pending(struct packet_ring_buffer
*rb
)
1198 this_cpu_inc(*rb
->pending_refcnt
);
1201 static void packet_dec_pending(struct packet_ring_buffer
*rb
)
1203 this_cpu_dec(*rb
->pending_refcnt
);
1206 static unsigned int packet_read_pending(const struct packet_ring_buffer
*rb
)
1208 unsigned int refcnt
= 0;
1211 /* We don't use pending refcount in rx_ring. */
1212 if (rb
->pending_refcnt
== NULL
)
1215 for_each_possible_cpu(cpu
)
1216 refcnt
+= *per_cpu_ptr(rb
->pending_refcnt
, cpu
);
1221 static int packet_alloc_pending(struct packet_sock
*po
)
1223 po
->rx_ring
.pending_refcnt
= NULL
;
1225 po
->tx_ring
.pending_refcnt
= alloc_percpu(unsigned int);
1226 if (unlikely(po
->tx_ring
.pending_refcnt
== NULL
))
1232 static void packet_free_pending(struct packet_sock
*po
)
1234 free_percpu(po
->tx_ring
.pending_refcnt
);
1237 static bool packet_rcv_has_room(struct packet_sock
*po
, struct sk_buff
*skb
)
1239 struct sock
*sk
= &po
->sk
;
1242 if (po
->prot_hook
.func
!= tpacket_rcv
)
1243 return (atomic_read(&sk
->sk_rmem_alloc
) + skb
->truesize
)
1246 spin_lock(&sk
->sk_receive_queue
.lock
);
1247 if (po
->tp_version
== TPACKET_V3
)
1248 has_room
= prb_lookup_block(po
, &po
->rx_ring
,
1249 po
->rx_ring
.prb_bdqc
.kactive_blk_num
,
1252 has_room
= packet_lookup_frame(po
, &po
->rx_ring
,
1255 spin_unlock(&sk
->sk_receive_queue
.lock
);
1260 static void packet_sock_destruct(struct sock
*sk
)
1262 skb_queue_purge(&sk
->sk_error_queue
);
1264 WARN_ON(atomic_read(&sk
->sk_rmem_alloc
));
1265 WARN_ON(atomic_read(&sk
->sk_wmem_alloc
));
1267 if (!sock_flag(sk
, SOCK_DEAD
)) {
1268 pr_err("Attempt to release alive packet socket: %p\n", sk
);
1272 sk_refcnt_debug_dec(sk
);
1275 static int fanout_rr_next(struct packet_fanout
*f
, unsigned int num
)
1277 int x
= atomic_read(&f
->rr_cur
) + 1;
1285 static unsigned int fanout_demux_hash(struct packet_fanout
*f
,
1286 struct sk_buff
*skb
,
1289 return reciprocal_scale(skb_get_hash(skb
), num
);
1292 static unsigned int fanout_demux_lb(struct packet_fanout
*f
,
1293 struct sk_buff
*skb
,
1298 cur
= atomic_read(&f
->rr_cur
);
1299 while ((old
= atomic_cmpxchg(&f
->rr_cur
, cur
,
1300 fanout_rr_next(f
, num
))) != cur
)
1305 static unsigned int fanout_demux_cpu(struct packet_fanout
*f
,
1306 struct sk_buff
*skb
,
1309 return smp_processor_id() % num
;
1312 static unsigned int fanout_demux_rnd(struct packet_fanout
*f
,
1313 struct sk_buff
*skb
,
1316 return prandom_u32_max(num
);
1319 static unsigned int fanout_demux_rollover(struct packet_fanout
*f
,
1320 struct sk_buff
*skb
,
1321 unsigned int idx
, unsigned int skip
,
1326 i
= j
= min_t(int, f
->next
[idx
], num
- 1);
1328 if (i
!= skip
&& packet_rcv_has_room(pkt_sk(f
->arr
[i
]), skb
)) {
1340 static unsigned int fanout_demux_qm(struct packet_fanout
*f
,
1341 struct sk_buff
*skb
,
1344 return skb_get_queue_mapping(skb
) % num
;
1347 static bool fanout_has_flag(struct packet_fanout
*f
, u16 flag
)
1349 return f
->flags
& (flag
>> 8);
1352 static int packet_rcv_fanout(struct sk_buff
*skb
, struct net_device
*dev
,
1353 struct packet_type
*pt
, struct net_device
*orig_dev
)
1355 struct packet_fanout
*f
= pt
->af_packet_priv
;
1356 unsigned int num
= f
->num_members
;
1357 struct packet_sock
*po
;
1360 if (!net_eq(dev_net(dev
), read_pnet(&f
->net
)) ||
1366 if (fanout_has_flag(f
, PACKET_FANOUT_FLAG_DEFRAG
)) {
1367 skb
= ip_check_defrag(skb
, IP_DEFRAG_AF_PACKET
);
1372 case PACKET_FANOUT_HASH
:
1374 idx
= fanout_demux_hash(f
, skb
, num
);
1376 case PACKET_FANOUT_LB
:
1377 idx
= fanout_demux_lb(f
, skb
, num
);
1379 case PACKET_FANOUT_CPU
:
1380 idx
= fanout_demux_cpu(f
, skb
, num
);
1382 case PACKET_FANOUT_RND
:
1383 idx
= fanout_demux_rnd(f
, skb
, num
);
1385 case PACKET_FANOUT_QM
:
1386 idx
= fanout_demux_qm(f
, skb
, num
);
1388 case PACKET_FANOUT_ROLLOVER
:
1389 idx
= fanout_demux_rollover(f
, skb
, 0, (unsigned int) -1, num
);
1393 po
= pkt_sk(f
->arr
[idx
]);
1394 if (fanout_has_flag(f
, PACKET_FANOUT_FLAG_ROLLOVER
) &&
1395 unlikely(!packet_rcv_has_room(po
, skb
))) {
1396 idx
= fanout_demux_rollover(f
, skb
, idx
, idx
, num
);
1397 po
= pkt_sk(f
->arr
[idx
]);
1400 return po
->prot_hook
.func(skb
, dev
, &po
->prot_hook
, orig_dev
);
1403 DEFINE_MUTEX(fanout_mutex
);
1404 EXPORT_SYMBOL_GPL(fanout_mutex
);
1405 static LIST_HEAD(fanout_list
);
1407 static void __fanout_link(struct sock
*sk
, struct packet_sock
*po
)
1409 struct packet_fanout
*f
= po
->fanout
;
1411 spin_lock(&f
->lock
);
1412 f
->arr
[f
->num_members
] = sk
;
1415 spin_unlock(&f
->lock
);
1418 static void __fanout_unlink(struct sock
*sk
, struct packet_sock
*po
)
1420 struct packet_fanout
*f
= po
->fanout
;
1423 spin_lock(&f
->lock
);
1424 for (i
= 0; i
< f
->num_members
; i
++) {
1425 if (f
->arr
[i
] == sk
)
1428 BUG_ON(i
>= f
->num_members
);
1429 f
->arr
[i
] = f
->arr
[f
->num_members
- 1];
1431 spin_unlock(&f
->lock
);
1434 static bool match_fanout_group(struct packet_type
*ptype
, struct sock
*sk
)
1436 if (ptype
->af_packet_priv
== (void *)((struct packet_sock
*)sk
)->fanout
)
1442 static int fanout_add(struct sock
*sk
, u16 id
, u16 type_flags
)
1444 struct packet_sock
*po
= pkt_sk(sk
);
1445 struct packet_fanout
*f
, *match
;
1446 u8 type
= type_flags
& 0xff;
1447 u8 flags
= type_flags
>> 8;
1451 case PACKET_FANOUT_ROLLOVER
:
1452 if (type_flags
& PACKET_FANOUT_FLAG_ROLLOVER
)
1454 case PACKET_FANOUT_HASH
:
1455 case PACKET_FANOUT_LB
:
1456 case PACKET_FANOUT_CPU
:
1457 case PACKET_FANOUT_RND
:
1458 case PACKET_FANOUT_QM
:
1470 mutex_lock(&fanout_mutex
);
1472 list_for_each_entry(f
, &fanout_list
, list
) {
1474 read_pnet(&f
->net
) == sock_net(sk
)) {
1480 if (match
&& match
->flags
!= flags
)
1484 match
= kzalloc(sizeof(*match
), GFP_KERNEL
);
1487 write_pnet(&match
->net
, sock_net(sk
));
1490 match
->flags
= flags
;
1491 atomic_set(&match
->rr_cur
, 0);
1492 INIT_LIST_HEAD(&match
->list
);
1493 spin_lock_init(&match
->lock
);
1494 atomic_set(&match
->sk_ref
, 0);
1495 match
->prot_hook
.type
= po
->prot_hook
.type
;
1496 match
->prot_hook
.dev
= po
->prot_hook
.dev
;
1497 match
->prot_hook
.func
= packet_rcv_fanout
;
1498 match
->prot_hook
.af_packet_priv
= match
;
1499 match
->prot_hook
.id_match
= match_fanout_group
;
1500 dev_add_pack(&match
->prot_hook
);
1501 list_add(&match
->list
, &fanout_list
);
1504 if (match
->type
== type
&&
1505 match
->prot_hook
.type
== po
->prot_hook
.type
&&
1506 match
->prot_hook
.dev
== po
->prot_hook
.dev
) {
1508 if (atomic_read(&match
->sk_ref
) < PACKET_FANOUT_MAX
) {
1509 __dev_remove_pack(&po
->prot_hook
);
1511 atomic_inc(&match
->sk_ref
);
1512 __fanout_link(sk
, po
);
1517 mutex_unlock(&fanout_mutex
);
1521 static void fanout_release(struct sock
*sk
)
1523 struct packet_sock
*po
= pkt_sk(sk
);
1524 struct packet_fanout
*f
;
1530 mutex_lock(&fanout_mutex
);
1533 if (atomic_dec_and_test(&f
->sk_ref
)) {
1535 dev_remove_pack(&f
->prot_hook
);
1538 mutex_unlock(&fanout_mutex
);
1541 static const struct proto_ops packet_ops
;
1543 static const struct proto_ops packet_ops_spkt
;
1545 static int packet_rcv_spkt(struct sk_buff
*skb
, struct net_device
*dev
,
1546 struct packet_type
*pt
, struct net_device
*orig_dev
)
1549 struct sockaddr_pkt
*spkt
;
1552 * When we registered the protocol we saved the socket in the data
1553 * field for just this event.
1556 sk
= pt
->af_packet_priv
;
1559 * Yank back the headers [hope the device set this
1560 * right or kerboom...]
1562 * Incoming packets have ll header pulled,
1565 * For outgoing ones skb->data == skb_mac_header(skb)
1566 * so that this procedure is noop.
1569 if (skb
->pkt_type
== PACKET_LOOPBACK
)
1572 if (!net_eq(dev_net(dev
), sock_net(sk
)))
1575 skb
= skb_share_check(skb
, GFP_ATOMIC
);
1579 /* drop any routing info */
1582 /* drop conntrack reference */
1585 spkt
= &PACKET_SKB_CB(skb
)->sa
.pkt
;
1587 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
1590 * The SOCK_PACKET socket receives _all_ frames.
1593 spkt
->spkt_family
= dev
->type
;
1594 strlcpy(spkt
->spkt_device
, dev
->name
, sizeof(spkt
->spkt_device
));
1595 spkt
->spkt_protocol
= skb
->protocol
;
1598 * Charge the memory to the socket. This is done specifically
1599 * to prevent sockets using all the memory up.
1602 if (sock_queue_rcv_skb(sk
, skb
) == 0)
1613 * Output a raw packet to a device layer. This bypasses all the other
1614 * protocol layers and you must therefore supply it with a complete frame
1617 static int packet_sendmsg_spkt(struct socket
*sock
, struct msghdr
*msg
,
1620 struct sock
*sk
= sock
->sk
;
1621 DECLARE_SOCKADDR(struct sockaddr_pkt
*, saddr
, msg
->msg_name
);
1622 struct sk_buff
*skb
= NULL
;
1623 struct net_device
*dev
;
1629 * Get and verify the address.
1633 if (msg
->msg_namelen
< sizeof(struct sockaddr
))
1635 if (msg
->msg_namelen
== sizeof(struct sockaddr_pkt
))
1636 proto
= saddr
->spkt_protocol
;
1638 return -ENOTCONN
; /* SOCK_PACKET must be sent giving an address */
1641 * Find the device first to size check it
1644 saddr
->spkt_device
[sizeof(saddr
->spkt_device
) - 1] = 0;
1647 dev
= dev_get_by_name_rcu(sock_net(sk
), saddr
->spkt_device
);
1653 if (!(dev
->flags
& IFF_UP
))
1657 * You may not queue a frame bigger than the mtu. This is the lowest level
1658 * raw protocol and you must do your own fragmentation at this level.
1661 if (unlikely(sock_flag(sk
, SOCK_NOFCS
))) {
1662 if (!netif_supports_nofcs(dev
)) {
1663 err
= -EPROTONOSUPPORT
;
1666 extra_len
= 4; /* We're doing our own CRC */
1670 if (len
> dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
+ extra_len
)
1674 size_t reserved
= LL_RESERVED_SPACE(dev
);
1675 int tlen
= dev
->needed_tailroom
;
1676 unsigned int hhlen
= dev
->header_ops
? dev
->hard_header_len
: 0;
1679 skb
= sock_wmalloc(sk
, len
+ reserved
+ tlen
, 0, GFP_KERNEL
);
1682 /* FIXME: Save some space for broken drivers that write a hard
1683 * header at transmission time by themselves. PPP is the notable
1684 * one here. This should really be fixed at the driver level.
1686 skb_reserve(skb
, reserved
);
1687 skb_reset_network_header(skb
);
1689 /* Try to align data part correctly */
1694 skb_reset_network_header(skb
);
1696 err
= memcpy_from_msg(skb_put(skb
, len
), msg
, len
);
1702 if (len
> (dev
->mtu
+ dev
->hard_header_len
+ extra_len
)) {
1703 /* Earlier code assumed this would be a VLAN pkt,
1704 * double-check this now that we have the actual
1707 struct ethhdr
*ehdr
;
1708 skb_reset_mac_header(skb
);
1709 ehdr
= eth_hdr(skb
);
1710 if (ehdr
->h_proto
!= htons(ETH_P_8021Q
)) {
1716 skb
->protocol
= proto
;
1718 skb
->priority
= sk
->sk_priority
;
1719 skb
->mark
= sk
->sk_mark
;
1721 sock_tx_timestamp(sk
, &skb_shinfo(skb
)->tx_flags
);
1723 if (unlikely(extra_len
== 4))
1726 skb_probe_transport_header(skb
, 0);
1728 dev_queue_xmit(skb
);
1739 static unsigned int run_filter(const struct sk_buff
*skb
,
1740 const struct sock
*sk
,
1743 struct sk_filter
*filter
;
1746 filter
= rcu_dereference(sk
->sk_filter
);
1748 res
= SK_RUN_FILTER(filter
, skb
);
1755 * This function makes lazy skb cloning in hope that most of packets
1756 * are discarded by BPF.
1758 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
1759 * and skb->cb are mangled. It works because (and until) packets
1760 * falling here are owned by current CPU. Output packets are cloned
1761 * by dev_queue_xmit_nit(), input packets are processed by net_bh
1762 * sequencially, so that if we return skb to original state on exit,
1763 * we will not harm anyone.
1766 static int packet_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
1767 struct packet_type
*pt
, struct net_device
*orig_dev
)
1770 struct sockaddr_ll
*sll
;
1771 struct packet_sock
*po
;
1772 u8
*skb_head
= skb
->data
;
1773 int skb_len
= skb
->len
;
1774 unsigned int snaplen
, res
;
1776 if (skb
->pkt_type
== PACKET_LOOPBACK
)
1779 sk
= pt
->af_packet_priv
;
1782 if (!net_eq(dev_net(dev
), sock_net(sk
)))
1787 if (dev
->header_ops
) {
1788 /* The device has an explicit notion of ll header,
1789 * exported to higher levels.
1791 * Otherwise, the device hides details of its frame
1792 * structure, so that corresponding packet head is
1793 * never delivered to user.
1795 if (sk
->sk_type
!= SOCK_DGRAM
)
1796 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
1797 else if (skb
->pkt_type
== PACKET_OUTGOING
) {
1798 /* Special case: outgoing packets have ll header at head */
1799 skb_pull(skb
, skb_network_offset(skb
));
1805 res
= run_filter(skb
, sk
, snaplen
);
1807 goto drop_n_restore
;
1811 if (atomic_read(&sk
->sk_rmem_alloc
) >= sk
->sk_rcvbuf
)
1814 if (skb_shared(skb
)) {
1815 struct sk_buff
*nskb
= skb_clone(skb
, GFP_ATOMIC
);
1819 if (skb_head
!= skb
->data
) {
1820 skb
->data
= skb_head
;
1827 sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb
)) + MAX_ADDR_LEN
- 8);
1829 sll
= &PACKET_SKB_CB(skb
)->sa
.ll
;
1830 sll
->sll_hatype
= dev
->type
;
1831 sll
->sll_pkttype
= skb
->pkt_type
;
1832 if (unlikely(po
->origdev
))
1833 sll
->sll_ifindex
= orig_dev
->ifindex
;
1835 sll
->sll_ifindex
= dev
->ifindex
;
1837 sll
->sll_halen
= dev_parse_header(skb
, sll
->sll_addr
);
1839 /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg().
1840 * Use their space for storing the original skb length.
1842 PACKET_SKB_CB(skb
)->sa
.origlen
= skb
->len
;
1844 if (pskb_trim(skb
, snaplen
))
1847 skb_set_owner_r(skb
, sk
);
1851 /* drop conntrack reference */
1854 spin_lock(&sk
->sk_receive_queue
.lock
);
1855 po
->stats
.stats1
.tp_packets
++;
1856 sock_skb_set_dropcount(sk
, skb
);
1857 __skb_queue_tail(&sk
->sk_receive_queue
, skb
);
1858 spin_unlock(&sk
->sk_receive_queue
.lock
);
1859 sk
->sk_data_ready(sk
);
1863 spin_lock(&sk
->sk_receive_queue
.lock
);
1864 po
->stats
.stats1
.tp_drops
++;
1865 atomic_inc(&sk
->sk_drops
);
1866 spin_unlock(&sk
->sk_receive_queue
.lock
);
1869 if (skb_head
!= skb
->data
&& skb_shared(skb
)) {
1870 skb
->data
= skb_head
;
1878 static int tpacket_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
1879 struct packet_type
*pt
, struct net_device
*orig_dev
)
1882 struct packet_sock
*po
;
1883 struct sockaddr_ll
*sll
;
1884 union tpacket_uhdr h
;
1885 u8
*skb_head
= skb
->data
;
1886 int skb_len
= skb
->len
;
1887 unsigned int snaplen
, res
;
1888 unsigned long status
= TP_STATUS_USER
;
1889 unsigned short macoff
, netoff
, hdrlen
;
1890 struct sk_buff
*copy_skb
= NULL
;
1894 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
1895 * We may add members to them until current aligned size without forcing
1896 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
1898 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h
.h2
)) != 32);
1899 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h
.h3
)) != 48);
1901 if (skb
->pkt_type
== PACKET_LOOPBACK
)
1904 sk
= pt
->af_packet_priv
;
1907 if (!net_eq(dev_net(dev
), sock_net(sk
)))
1910 if (dev
->header_ops
) {
1911 if (sk
->sk_type
!= SOCK_DGRAM
)
1912 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
1913 else if (skb
->pkt_type
== PACKET_OUTGOING
) {
1914 /* Special case: outgoing packets have ll header at head */
1915 skb_pull(skb
, skb_network_offset(skb
));
1921 res
= run_filter(skb
, sk
, snaplen
);
1923 goto drop_n_restore
;
1925 if (skb
->ip_summed
== CHECKSUM_PARTIAL
)
1926 status
|= TP_STATUS_CSUMNOTREADY
;
1931 if (sk
->sk_type
== SOCK_DGRAM
) {
1932 macoff
= netoff
= TPACKET_ALIGN(po
->tp_hdrlen
) + 16 +
1935 unsigned int maclen
= skb_network_offset(skb
);
1936 netoff
= TPACKET_ALIGN(po
->tp_hdrlen
+
1937 (maclen
< 16 ? 16 : maclen
)) +
1939 macoff
= netoff
- maclen
;
1941 if (po
->tp_version
<= TPACKET_V2
) {
1942 if (macoff
+ snaplen
> po
->rx_ring
.frame_size
) {
1943 if (po
->copy_thresh
&&
1944 atomic_read(&sk
->sk_rmem_alloc
) < sk
->sk_rcvbuf
) {
1945 if (skb_shared(skb
)) {
1946 copy_skb
= skb_clone(skb
, GFP_ATOMIC
);
1948 copy_skb
= skb_get(skb
);
1949 skb_head
= skb
->data
;
1952 skb_set_owner_r(copy_skb
, sk
);
1954 snaplen
= po
->rx_ring
.frame_size
- macoff
;
1955 if ((int)snaplen
< 0)
1958 } else if (unlikely(macoff
+ snaplen
>
1959 GET_PBDQC_FROM_RB(&po
->rx_ring
)->max_frame_len
)) {
1962 nval
= GET_PBDQC_FROM_RB(&po
->rx_ring
)->max_frame_len
- macoff
;
1963 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
1964 snaplen
, nval
, macoff
);
1966 if (unlikely((int)snaplen
< 0)) {
1968 macoff
= GET_PBDQC_FROM_RB(&po
->rx_ring
)->max_frame_len
;
1971 spin_lock(&sk
->sk_receive_queue
.lock
);
1972 h
.raw
= packet_current_rx_frame(po
, skb
,
1973 TP_STATUS_KERNEL
, (macoff
+snaplen
));
1976 if (po
->tp_version
<= TPACKET_V2
) {
1977 packet_increment_rx_head(po
, &po
->rx_ring
);
1979 * LOSING will be reported till you read the stats,
1980 * because it's COR - Clear On Read.
1981 * Anyways, moving it for V1/V2 only as V3 doesn't need this
1984 if (po
->stats
.stats1
.tp_drops
)
1985 status
|= TP_STATUS_LOSING
;
1987 po
->stats
.stats1
.tp_packets
++;
1989 status
|= TP_STATUS_COPY
;
1990 __skb_queue_tail(&sk
->sk_receive_queue
, copy_skb
);
1992 spin_unlock(&sk
->sk_receive_queue
.lock
);
1994 skb_copy_bits(skb
, 0, h
.raw
+ macoff
, snaplen
);
1996 if (!(ts_status
= tpacket_get_timestamp(skb
, &ts
, po
->tp_tstamp
)))
1997 getnstimeofday(&ts
);
1999 status
|= ts_status
;
2001 switch (po
->tp_version
) {
2003 h
.h1
->tp_len
= skb
->len
;
2004 h
.h1
->tp_snaplen
= snaplen
;
2005 h
.h1
->tp_mac
= macoff
;
2006 h
.h1
->tp_net
= netoff
;
2007 h
.h1
->tp_sec
= ts
.tv_sec
;
2008 h
.h1
->tp_usec
= ts
.tv_nsec
/ NSEC_PER_USEC
;
2009 hdrlen
= sizeof(*h
.h1
);
2012 h
.h2
->tp_len
= skb
->len
;
2013 h
.h2
->tp_snaplen
= snaplen
;
2014 h
.h2
->tp_mac
= macoff
;
2015 h
.h2
->tp_net
= netoff
;
2016 h
.h2
->tp_sec
= ts
.tv_sec
;
2017 h
.h2
->tp_nsec
= ts
.tv_nsec
;
2018 if (skb_vlan_tag_present(skb
)) {
2019 h
.h2
->tp_vlan_tci
= skb_vlan_tag_get(skb
);
2020 h
.h2
->tp_vlan_tpid
= ntohs(skb
->vlan_proto
);
2021 status
|= TP_STATUS_VLAN_VALID
| TP_STATUS_VLAN_TPID_VALID
;
2023 h
.h2
->tp_vlan_tci
= 0;
2024 h
.h2
->tp_vlan_tpid
= 0;
2026 memset(h
.h2
->tp_padding
, 0, sizeof(h
.h2
->tp_padding
));
2027 hdrlen
= sizeof(*h
.h2
);
2030 /* tp_nxt_offset,vlan are already populated above.
2031 * So DONT clear those fields here
2033 h
.h3
->tp_status
|= status
;
2034 h
.h3
->tp_len
= skb
->len
;
2035 h
.h3
->tp_snaplen
= snaplen
;
2036 h
.h3
->tp_mac
= macoff
;
2037 h
.h3
->tp_net
= netoff
;
2038 h
.h3
->tp_sec
= ts
.tv_sec
;
2039 h
.h3
->tp_nsec
= ts
.tv_nsec
;
2040 memset(h
.h3
->tp_padding
, 0, sizeof(h
.h3
->tp_padding
));
2041 hdrlen
= sizeof(*h
.h3
);
2047 sll
= h
.raw
+ TPACKET_ALIGN(hdrlen
);
2048 sll
->sll_halen
= dev_parse_header(skb
, sll
->sll_addr
);
2049 sll
->sll_family
= AF_PACKET
;
2050 sll
->sll_hatype
= dev
->type
;
2051 sll
->sll_protocol
= skb
->protocol
;
2052 sll
->sll_pkttype
= skb
->pkt_type
;
2053 if (unlikely(po
->origdev
))
2054 sll
->sll_ifindex
= orig_dev
->ifindex
;
2056 sll
->sll_ifindex
= dev
->ifindex
;
2060 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
2061 if (po
->tp_version
<= TPACKET_V2
) {
2064 end
= (u8
*) PAGE_ALIGN((unsigned long) h
.raw
+
2067 for (start
= h
.raw
; start
< end
; start
+= PAGE_SIZE
)
2068 flush_dcache_page(pgv_to_page(start
));
2073 if (po
->tp_version
<= TPACKET_V2
) {
2074 __packet_set_status(po
, h
.raw
, status
);
2075 sk
->sk_data_ready(sk
);
2077 prb_clear_blk_fill_status(&po
->rx_ring
);
2081 if (skb_head
!= skb
->data
&& skb_shared(skb
)) {
2082 skb
->data
= skb_head
;
2090 po
->stats
.stats1
.tp_drops
++;
2091 spin_unlock(&sk
->sk_receive_queue
.lock
);
2093 sk
->sk_data_ready(sk
);
2094 kfree_skb(copy_skb
);
2095 goto drop_n_restore
;
2098 static void tpacket_destruct_skb(struct sk_buff
*skb
)
2100 struct packet_sock
*po
= pkt_sk(skb
->sk
);
2102 if (likely(po
->tx_ring
.pg_vec
)) {
2106 ph
= skb_shinfo(skb
)->destructor_arg
;
2107 packet_dec_pending(&po
->tx_ring
);
2109 ts
= __packet_set_timestamp(po
, ph
, skb
);
2110 __packet_set_status(po
, ph
, TP_STATUS_AVAILABLE
| ts
);
2116 static bool ll_header_truncated(const struct net_device
*dev
, int len
)
2118 /* net device doesn't like empty head */
2119 if (unlikely(len
<= dev
->hard_header_len
)) {
2120 net_warn_ratelimited("%s: packet size is too short (%d <= %d)\n",
2121 current
->comm
, len
, dev
->hard_header_len
);
2128 static int tpacket_fill_skb(struct packet_sock
*po
, struct sk_buff
*skb
,
2129 void *frame
, struct net_device
*dev
, int size_max
,
2130 __be16 proto
, unsigned char *addr
, int hlen
)
2132 union tpacket_uhdr ph
;
2133 int to_write
, offset
, len
, tp_len
, nr_frags
, len_max
;
2134 struct socket
*sock
= po
->sk
.sk_socket
;
2141 skb
->protocol
= proto
;
2143 skb
->priority
= po
->sk
.sk_priority
;
2144 skb
->mark
= po
->sk
.sk_mark
;
2145 sock_tx_timestamp(&po
->sk
, &skb_shinfo(skb
)->tx_flags
);
2146 skb_shinfo(skb
)->destructor_arg
= ph
.raw
;
2148 switch (po
->tp_version
) {
2150 tp_len
= ph
.h2
->tp_len
;
2153 tp_len
= ph
.h1
->tp_len
;
2156 if (unlikely(tp_len
> size_max
)) {
2157 pr_err("packet size is too long (%d > %d)\n", tp_len
, size_max
);
2161 skb_reserve(skb
, hlen
);
2162 skb_reset_network_header(skb
);
2164 if (!packet_use_direct_xmit(po
))
2165 skb_probe_transport_header(skb
, 0);
2166 if (unlikely(po
->tp_tx_has_off
)) {
2167 int off_min
, off_max
, off
;
2168 off_min
= po
->tp_hdrlen
- sizeof(struct sockaddr_ll
);
2169 off_max
= po
->tx_ring
.frame_size
- tp_len
;
2170 if (sock
->type
== SOCK_DGRAM
) {
2171 switch (po
->tp_version
) {
2173 off
= ph
.h2
->tp_net
;
2176 off
= ph
.h1
->tp_net
;
2180 switch (po
->tp_version
) {
2182 off
= ph
.h2
->tp_mac
;
2185 off
= ph
.h1
->tp_mac
;
2189 if (unlikely((off
< off_min
) || (off_max
< off
)))
2191 data
= ph
.raw
+ off
;
2193 data
= ph
.raw
+ po
->tp_hdrlen
- sizeof(struct sockaddr_ll
);
2197 if (sock
->type
== SOCK_DGRAM
) {
2198 err
= dev_hard_header(skb
, dev
, ntohs(proto
), addr
,
2200 if (unlikely(err
< 0))
2202 } else if (dev
->hard_header_len
) {
2203 if (ll_header_truncated(dev
, tp_len
))
2206 skb_push(skb
, dev
->hard_header_len
);
2207 err
= skb_store_bits(skb
, 0, data
,
2208 dev
->hard_header_len
);
2212 data
+= dev
->hard_header_len
;
2213 to_write
-= dev
->hard_header_len
;
2216 offset
= offset_in_page(data
);
2217 len_max
= PAGE_SIZE
- offset
;
2218 len
= ((to_write
> len_max
) ? len_max
: to_write
);
2220 skb
->data_len
= to_write
;
2221 skb
->len
+= to_write
;
2222 skb
->truesize
+= to_write
;
2223 atomic_add(to_write
, &po
->sk
.sk_wmem_alloc
);
2225 while (likely(to_write
)) {
2226 nr_frags
= skb_shinfo(skb
)->nr_frags
;
2228 if (unlikely(nr_frags
>= MAX_SKB_FRAGS
)) {
2229 pr_err("Packet exceed the number of skb frags(%lu)\n",
2234 page
= pgv_to_page(data
);
2236 flush_dcache_page(page
);
2238 skb_fill_page_desc(skb
, nr_frags
, page
, offset
, len
);
2241 len_max
= PAGE_SIZE
;
2242 len
= ((to_write
> len_max
) ? len_max
: to_write
);
2248 static int tpacket_snd(struct packet_sock
*po
, struct msghdr
*msg
)
2250 struct sk_buff
*skb
;
2251 struct net_device
*dev
;
2253 int err
, reserve
= 0;
2255 DECLARE_SOCKADDR(struct sockaddr_ll
*, saddr
, msg
->msg_name
);
2256 bool need_wait
= !(msg
->msg_flags
& MSG_DONTWAIT
);
2257 int tp_len
, size_max
;
2258 unsigned char *addr
;
2260 int status
= TP_STATUS_AVAILABLE
;
2263 mutex_lock(&po
->pg_vec_lock
);
2265 if (likely(saddr
== NULL
)) {
2266 dev
= packet_cached_dev_get(po
);
2271 if (msg
->msg_namelen
< sizeof(struct sockaddr_ll
))
2273 if (msg
->msg_namelen
< (saddr
->sll_halen
2274 + offsetof(struct sockaddr_ll
,
2277 proto
= saddr
->sll_protocol
;
2278 addr
= saddr
->sll_addr
;
2279 dev
= dev_get_by_index(sock_net(&po
->sk
), saddr
->sll_ifindex
);
2283 if (unlikely(dev
== NULL
))
2286 if (unlikely(!(dev
->flags
& IFF_UP
)))
2289 reserve
= dev
->hard_header_len
+ VLAN_HLEN
;
2290 size_max
= po
->tx_ring
.frame_size
2291 - (po
->tp_hdrlen
- sizeof(struct sockaddr_ll
));
2293 if (size_max
> dev
->mtu
+ reserve
)
2294 size_max
= dev
->mtu
+ reserve
;
2297 ph
= packet_current_frame(po
, &po
->tx_ring
,
2298 TP_STATUS_SEND_REQUEST
);
2299 if (unlikely(ph
== NULL
)) {
2300 if (need_wait
&& need_resched())
2305 status
= TP_STATUS_SEND_REQUEST
;
2306 hlen
= LL_RESERVED_SPACE(dev
);
2307 tlen
= dev
->needed_tailroom
;
2308 skb
= sock_alloc_send_skb(&po
->sk
,
2309 hlen
+ tlen
+ sizeof(struct sockaddr_ll
),
2312 if (unlikely(skb
== NULL
))
2315 tp_len
= tpacket_fill_skb(po
, skb
, ph
, dev
, size_max
, proto
,
2317 if (tp_len
> dev
->mtu
+ dev
->hard_header_len
) {
2318 struct ethhdr
*ehdr
;
2319 /* Earlier code assumed this would be a VLAN pkt,
2320 * double-check this now that we have the actual
2324 skb_reset_mac_header(skb
);
2325 ehdr
= eth_hdr(skb
);
2326 if (ehdr
->h_proto
!= htons(ETH_P_8021Q
))
2329 if (unlikely(tp_len
< 0)) {
2331 __packet_set_status(po
, ph
,
2332 TP_STATUS_AVAILABLE
);
2333 packet_increment_head(&po
->tx_ring
);
2337 status
= TP_STATUS_WRONG_FORMAT
;
2343 packet_pick_tx_queue(dev
, skb
);
2345 skb
->destructor
= tpacket_destruct_skb
;
2346 __packet_set_status(po
, ph
, TP_STATUS_SENDING
);
2347 packet_inc_pending(&po
->tx_ring
);
2349 status
= TP_STATUS_SEND_REQUEST
;
2350 err
= po
->xmit(skb
);
2351 if (unlikely(err
> 0)) {
2352 err
= net_xmit_errno(err
);
2353 if (err
&& __packet_get_status(po
, ph
) ==
2354 TP_STATUS_AVAILABLE
) {
2355 /* skb was destructed already */
2360 * skb was dropped but not destructed yet;
2361 * let's treat it like congestion or err < 0
2365 packet_increment_head(&po
->tx_ring
);
2367 } while (likely((ph
!= NULL
) ||
2368 /* Note: packet_read_pending() might be slow if we have
2369 * to call it as it's per_cpu variable, but in fast-path
2370 * we already short-circuit the loop with the first
2371 * condition, and luckily don't have to go that path
2374 (need_wait
&& packet_read_pending(&po
->tx_ring
))));
2380 __packet_set_status(po
, ph
, status
);
2385 mutex_unlock(&po
->pg_vec_lock
);
2389 static struct sk_buff
*packet_alloc_skb(struct sock
*sk
, size_t prepad
,
2390 size_t reserve
, size_t len
,
2391 size_t linear
, int noblock
,
2394 struct sk_buff
*skb
;
2396 /* Under a page? Don't bother with paged skb. */
2397 if (prepad
+ len
< PAGE_SIZE
|| !linear
)
2400 skb
= sock_alloc_send_pskb(sk
, prepad
+ linear
, len
- linear
, noblock
,
2405 skb_reserve(skb
, reserve
);
2406 skb_put(skb
, linear
);
2407 skb
->data_len
= len
- linear
;
2408 skb
->len
+= len
- linear
;
2413 static int packet_snd(struct socket
*sock
, struct msghdr
*msg
, size_t len
)
2415 struct sock
*sk
= sock
->sk
;
2416 DECLARE_SOCKADDR(struct sockaddr_ll
*, saddr
, msg
->msg_name
);
2417 struct sk_buff
*skb
;
2418 struct net_device
*dev
;
2420 unsigned char *addr
;
2421 int err
, reserve
= 0;
2422 struct virtio_net_hdr vnet_hdr
= { 0 };
2425 struct packet_sock
*po
= pkt_sk(sk
);
2426 unsigned short gso_type
= 0;
2432 * Get and verify the address.
2435 if (likely(saddr
== NULL
)) {
2436 dev
= packet_cached_dev_get(po
);
2441 if (msg
->msg_namelen
< sizeof(struct sockaddr_ll
))
2443 if (msg
->msg_namelen
< (saddr
->sll_halen
+ offsetof(struct sockaddr_ll
, sll_addr
)))
2445 proto
= saddr
->sll_protocol
;
2446 addr
= saddr
->sll_addr
;
2447 dev
= dev_get_by_index(sock_net(sk
), saddr
->sll_ifindex
);
2451 if (unlikely(dev
== NULL
))
2454 if (unlikely(!(dev
->flags
& IFF_UP
)))
2457 if (sock
->type
== SOCK_RAW
)
2458 reserve
= dev
->hard_header_len
;
2459 if (po
->has_vnet_hdr
) {
2460 vnet_hdr_len
= sizeof(vnet_hdr
);
2463 if (len
< vnet_hdr_len
)
2466 len
-= vnet_hdr_len
;
2469 n
= copy_from_iter(&vnet_hdr
, vnet_hdr_len
, &msg
->msg_iter
);
2470 if (n
!= vnet_hdr_len
)
2473 if ((vnet_hdr
.flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) &&
2474 (__virtio16_to_cpu(false, vnet_hdr
.csum_start
) +
2475 __virtio16_to_cpu(false, vnet_hdr
.csum_offset
) + 2 >
2476 __virtio16_to_cpu(false, vnet_hdr
.hdr_len
)))
2477 vnet_hdr
.hdr_len
= __cpu_to_virtio16(false,
2478 __virtio16_to_cpu(false, vnet_hdr
.csum_start
) +
2479 __virtio16_to_cpu(false, vnet_hdr
.csum_offset
) + 2);
2482 if (__virtio16_to_cpu(false, vnet_hdr
.hdr_len
) > len
)
2485 if (vnet_hdr
.gso_type
!= VIRTIO_NET_HDR_GSO_NONE
) {
2486 switch (vnet_hdr
.gso_type
& ~VIRTIO_NET_HDR_GSO_ECN
) {
2487 case VIRTIO_NET_HDR_GSO_TCPV4
:
2488 gso_type
= SKB_GSO_TCPV4
;
2490 case VIRTIO_NET_HDR_GSO_TCPV6
:
2491 gso_type
= SKB_GSO_TCPV6
;
2493 case VIRTIO_NET_HDR_GSO_UDP
:
2494 gso_type
= SKB_GSO_UDP
;
2500 if (vnet_hdr
.gso_type
& VIRTIO_NET_HDR_GSO_ECN
)
2501 gso_type
|= SKB_GSO_TCP_ECN
;
2503 if (vnet_hdr
.gso_size
== 0)
2509 if (unlikely(sock_flag(sk
, SOCK_NOFCS
))) {
2510 if (!netif_supports_nofcs(dev
)) {
2511 err
= -EPROTONOSUPPORT
;
2514 extra_len
= 4; /* We're doing our own CRC */
2518 if (!gso_type
&& (len
> dev
->mtu
+ reserve
+ VLAN_HLEN
+ extra_len
))
2522 hlen
= LL_RESERVED_SPACE(dev
);
2523 tlen
= dev
->needed_tailroom
;
2524 skb
= packet_alloc_skb(sk
, hlen
+ tlen
, hlen
, len
,
2525 __virtio16_to_cpu(false, vnet_hdr
.hdr_len
),
2526 msg
->msg_flags
& MSG_DONTWAIT
, &err
);
2530 skb_set_network_header(skb
, reserve
);
2533 if (sock
->type
== SOCK_DGRAM
) {
2534 offset
= dev_hard_header(skb
, dev
, ntohs(proto
), addr
, NULL
, len
);
2535 if (unlikely(offset
< 0))
2538 if (ll_header_truncated(dev
, len
))
2542 /* Returns -EFAULT on error */
2543 err
= skb_copy_datagram_from_iter(skb
, offset
, &msg
->msg_iter
, len
);
2547 sock_tx_timestamp(sk
, &skb_shinfo(skb
)->tx_flags
);
2549 if (!gso_type
&& (len
> dev
->mtu
+ reserve
+ extra_len
)) {
2550 /* Earlier code assumed this would be a VLAN pkt,
2551 * double-check this now that we have the actual
2554 struct ethhdr
*ehdr
;
2555 skb_reset_mac_header(skb
);
2556 ehdr
= eth_hdr(skb
);
2557 if (ehdr
->h_proto
!= htons(ETH_P_8021Q
)) {
2563 skb
->protocol
= proto
;
2565 skb
->priority
= sk
->sk_priority
;
2566 skb
->mark
= sk
->sk_mark
;
2568 packet_pick_tx_queue(dev
, skb
);
2570 if (po
->has_vnet_hdr
) {
2571 if (vnet_hdr
.flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) {
2572 u16 s
= __virtio16_to_cpu(false, vnet_hdr
.csum_start
);
2573 u16 o
= __virtio16_to_cpu(false, vnet_hdr
.csum_offset
);
2574 if (!skb_partial_csum_set(skb
, s
, o
)) {
2580 skb_shinfo(skb
)->gso_size
=
2581 __virtio16_to_cpu(false, vnet_hdr
.gso_size
);
2582 skb_shinfo(skb
)->gso_type
= gso_type
;
2584 /* Header must be checked, and gso_segs computed. */
2585 skb_shinfo(skb
)->gso_type
|= SKB_GSO_DODGY
;
2586 skb_shinfo(skb
)->gso_segs
= 0;
2588 len
+= vnet_hdr_len
;
2591 if (!packet_use_direct_xmit(po
))
2592 skb_probe_transport_header(skb
, reserve
);
2593 if (unlikely(extra_len
== 4))
2596 err
= po
->xmit(skb
);
2597 if (err
> 0 && (err
= net_xmit_errno(err
)) != 0)
2613 static int packet_sendmsg(struct socket
*sock
, struct msghdr
*msg
, size_t len
)
2615 struct sock
*sk
= sock
->sk
;
2616 struct packet_sock
*po
= pkt_sk(sk
);
2618 if (po
->tx_ring
.pg_vec
)
2619 return tpacket_snd(po
, msg
);
2621 return packet_snd(sock
, msg
, len
);
2625 * Close a PACKET socket. This is fairly simple. We immediately go
2626 * to 'closed' state and remove our protocol entry in the device list.
2629 static int packet_release(struct socket
*sock
)
2631 struct sock
*sk
= sock
->sk
;
2632 struct packet_sock
*po
;
2634 union tpacket_req_u req_u
;
2642 mutex_lock(&net
->packet
.sklist_lock
);
2643 sk_del_node_init_rcu(sk
);
2644 mutex_unlock(&net
->packet
.sklist_lock
);
2647 sock_prot_inuse_add(net
, sk
->sk_prot
, -1);
2650 spin_lock(&po
->bind_lock
);
2651 unregister_prot_hook(sk
, false);
2652 packet_cached_dev_reset(po
);
2654 if (po
->prot_hook
.dev
) {
2655 dev_put(po
->prot_hook
.dev
);
2656 po
->prot_hook
.dev
= NULL
;
2658 spin_unlock(&po
->bind_lock
);
2660 packet_flush_mclist(sk
);
2662 if (po
->rx_ring
.pg_vec
) {
2663 memset(&req_u
, 0, sizeof(req_u
));
2664 packet_set_ring(sk
, &req_u
, 1, 0);
2667 if (po
->tx_ring
.pg_vec
) {
2668 memset(&req_u
, 0, sizeof(req_u
));
2669 packet_set_ring(sk
, &req_u
, 1, 1);
2676 * Now the socket is dead. No more input will appear.
2683 skb_queue_purge(&sk
->sk_receive_queue
);
2684 packet_free_pending(po
);
2685 sk_refcnt_debug_release(sk
);
2692 * Attach a packet hook.
2695 static int packet_do_bind(struct sock
*sk
, struct net_device
*dev
, __be16 proto
)
2697 struct packet_sock
*po
= pkt_sk(sk
);
2698 const struct net_device
*dev_curr
;
2710 spin_lock(&po
->bind_lock
);
2712 proto_curr
= po
->prot_hook
.type
;
2713 dev_curr
= po
->prot_hook
.dev
;
2715 need_rehook
= proto_curr
!= proto
|| dev_curr
!= dev
;
2718 unregister_prot_hook(sk
, true);
2721 po
->prot_hook
.type
= proto
;
2723 if (po
->prot_hook
.dev
)
2724 dev_put(po
->prot_hook
.dev
);
2726 po
->prot_hook
.dev
= dev
;
2728 po
->ifindex
= dev
? dev
->ifindex
: 0;
2729 packet_cached_dev_assign(po
, dev
);
2732 if (proto
== 0 || !need_rehook
)
2735 if (!dev
|| (dev
->flags
& IFF_UP
)) {
2736 register_prot_hook(sk
);
2738 sk
->sk_err
= ENETDOWN
;
2739 if (!sock_flag(sk
, SOCK_DEAD
))
2740 sk
->sk_error_report(sk
);
2744 spin_unlock(&po
->bind_lock
);
2750 * Bind a packet socket to a device
2753 static int packet_bind_spkt(struct socket
*sock
, struct sockaddr
*uaddr
,
2756 struct sock
*sk
= sock
->sk
;
2758 struct net_device
*dev
;
2765 if (addr_len
!= sizeof(struct sockaddr
))
2767 strlcpy(name
, uaddr
->sa_data
, sizeof(name
));
2769 dev
= dev_get_by_name(sock_net(sk
), name
);
2771 err
= packet_do_bind(sk
, dev
, pkt_sk(sk
)->num
);
2775 static int packet_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
)
2777 struct sockaddr_ll
*sll
= (struct sockaddr_ll
*)uaddr
;
2778 struct sock
*sk
= sock
->sk
;
2779 struct net_device
*dev
= NULL
;
2787 if (addr_len
< sizeof(struct sockaddr_ll
))
2789 if (sll
->sll_family
!= AF_PACKET
)
2792 if (sll
->sll_ifindex
) {
2794 dev
= dev_get_by_index(sock_net(sk
), sll
->sll_ifindex
);
2798 err
= packet_do_bind(sk
, dev
, sll
->sll_protocol
? : pkt_sk(sk
)->num
);
2804 static struct proto packet_proto
= {
2806 .owner
= THIS_MODULE
,
2807 .obj_size
= sizeof(struct packet_sock
),
2811 * Create a packet of type SOCK_PACKET.
2814 static int packet_create(struct net
*net
, struct socket
*sock
, int protocol
,
2818 struct packet_sock
*po
;
2819 __be16 proto
= (__force __be16
)protocol
; /* weird, but documented */
2822 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
))
2824 if (sock
->type
!= SOCK_DGRAM
&& sock
->type
!= SOCK_RAW
&&
2825 sock
->type
!= SOCK_PACKET
)
2826 return -ESOCKTNOSUPPORT
;
2828 sock
->state
= SS_UNCONNECTED
;
2831 sk
= sk_alloc(net
, PF_PACKET
, GFP_KERNEL
, &packet_proto
);
2835 sock
->ops
= &packet_ops
;
2836 if (sock
->type
== SOCK_PACKET
)
2837 sock
->ops
= &packet_ops_spkt
;
2839 sock_init_data(sock
, sk
);
2842 sk
->sk_family
= PF_PACKET
;
2844 po
->xmit
= dev_queue_xmit
;
2846 err
= packet_alloc_pending(po
);
2850 packet_cached_dev_reset(po
);
2852 sk
->sk_destruct
= packet_sock_destruct
;
2853 sk_refcnt_debug_inc(sk
);
2856 * Attach a protocol block
2859 spin_lock_init(&po
->bind_lock
);
2860 mutex_init(&po
->pg_vec_lock
);
2861 po
->prot_hook
.func
= packet_rcv
;
2863 if (sock
->type
== SOCK_PACKET
)
2864 po
->prot_hook
.func
= packet_rcv_spkt
;
2866 po
->prot_hook
.af_packet_priv
= sk
;
2869 po
->prot_hook
.type
= proto
;
2870 register_prot_hook(sk
);
2873 mutex_lock(&net
->packet
.sklist_lock
);
2874 sk_add_node_rcu(sk
, &net
->packet
.sklist
);
2875 mutex_unlock(&net
->packet
.sklist_lock
);
2878 sock_prot_inuse_add(net
, &packet_proto
, 1);
2889 * Pull a packet from our receive queue and hand it to the user.
2890 * If necessary we block.
2893 static int packet_recvmsg(struct socket
*sock
, struct msghdr
*msg
, size_t len
,
2896 struct sock
*sk
= sock
->sk
;
2897 struct sk_buff
*skb
;
2899 int vnet_hdr_len
= 0;
2900 unsigned int origlen
= 0;
2903 if (flags
& ~(MSG_PEEK
|MSG_DONTWAIT
|MSG_TRUNC
|MSG_CMSG_COMPAT
|MSG_ERRQUEUE
))
2907 /* What error should we return now? EUNATTACH? */
2908 if (pkt_sk(sk
)->ifindex
< 0)
2912 if (flags
& MSG_ERRQUEUE
) {
2913 err
= sock_recv_errqueue(sk
, msg
, len
,
2914 SOL_PACKET
, PACKET_TX_TIMESTAMP
);
2919 * Call the generic datagram receiver. This handles all sorts
2920 * of horrible races and re-entrancy so we can forget about it
2921 * in the protocol layers.
2923 * Now it will return ENETDOWN, if device have just gone down,
2924 * but then it will block.
2927 skb
= skb_recv_datagram(sk
, flags
, flags
& MSG_DONTWAIT
, &err
);
2930 * An error occurred so return it. Because skb_recv_datagram()
2931 * handles the blocking we don't see and worry about blocking
2938 if (pkt_sk(sk
)->has_vnet_hdr
) {
2939 struct virtio_net_hdr vnet_hdr
= { 0 };
2942 vnet_hdr_len
= sizeof(vnet_hdr
);
2943 if (len
< vnet_hdr_len
)
2946 len
-= vnet_hdr_len
;
2948 if (skb_is_gso(skb
)) {
2949 struct skb_shared_info
*sinfo
= skb_shinfo(skb
);
2951 /* This is a hint as to how much should be linear. */
2953 __cpu_to_virtio16(false, skb_headlen(skb
));
2955 __cpu_to_virtio16(false, sinfo
->gso_size
);
2956 if (sinfo
->gso_type
& SKB_GSO_TCPV4
)
2957 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV4
;
2958 else if (sinfo
->gso_type
& SKB_GSO_TCPV6
)
2959 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV6
;
2960 else if (sinfo
->gso_type
& SKB_GSO_UDP
)
2961 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_UDP
;
2962 else if (sinfo
->gso_type
& SKB_GSO_FCOE
)
2966 if (sinfo
->gso_type
& SKB_GSO_TCP_ECN
)
2967 vnet_hdr
.gso_type
|= VIRTIO_NET_HDR_GSO_ECN
;
2969 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_NONE
;
2971 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2972 vnet_hdr
.flags
= VIRTIO_NET_HDR_F_NEEDS_CSUM
;
2973 vnet_hdr
.csum_start
= __cpu_to_virtio16(false,
2974 skb_checksum_start_offset(skb
));
2975 vnet_hdr
.csum_offset
= __cpu_to_virtio16(false,
2977 } else if (skb
->ip_summed
== CHECKSUM_UNNECESSARY
) {
2978 vnet_hdr
.flags
= VIRTIO_NET_HDR_F_DATA_VALID
;
2979 } /* else everything is zero */
2981 err
= memcpy_to_msg(msg
, (void *)&vnet_hdr
, vnet_hdr_len
);
2986 /* You lose any data beyond the buffer you gave. If it worries
2987 * a user program they can ask the device for its MTU
2993 msg
->msg_flags
|= MSG_TRUNC
;
2996 err
= skb_copy_datagram_msg(skb
, 0, msg
, copied
);
3000 if (sock
->type
!= SOCK_PACKET
) {
3001 struct sockaddr_ll
*sll
= &PACKET_SKB_CB(skb
)->sa
.ll
;
3003 /* Original length was stored in sockaddr_ll fields */
3004 origlen
= PACKET_SKB_CB(skb
)->sa
.origlen
;
3005 sll
->sll_family
= AF_PACKET
;
3006 sll
->sll_protocol
= skb
->protocol
;
3009 sock_recv_ts_and_drops(msg
, sk
, skb
);
3011 if (msg
->msg_name
) {
3012 /* If the address length field is there to be filled
3013 * in, we fill it in now.
3015 if (sock
->type
== SOCK_PACKET
) {
3016 __sockaddr_check_size(sizeof(struct sockaddr_pkt
));
3017 msg
->msg_namelen
= sizeof(struct sockaddr_pkt
);
3019 struct sockaddr_ll
*sll
= &PACKET_SKB_CB(skb
)->sa
.ll
;
3021 msg
->msg_namelen
= sll
->sll_halen
+
3022 offsetof(struct sockaddr_ll
, sll_addr
);
3024 memcpy(msg
->msg_name
, &PACKET_SKB_CB(skb
)->sa
,
3028 if (pkt_sk(sk
)->auxdata
) {
3029 struct tpacket_auxdata aux
;
3031 aux
.tp_status
= TP_STATUS_USER
;
3032 if (skb
->ip_summed
== CHECKSUM_PARTIAL
)
3033 aux
.tp_status
|= TP_STATUS_CSUMNOTREADY
;
3034 aux
.tp_len
= origlen
;
3035 aux
.tp_snaplen
= skb
->len
;
3037 aux
.tp_net
= skb_network_offset(skb
);
3038 if (skb_vlan_tag_present(skb
)) {
3039 aux
.tp_vlan_tci
= skb_vlan_tag_get(skb
);
3040 aux
.tp_vlan_tpid
= ntohs(skb
->vlan_proto
);
3041 aux
.tp_status
|= TP_STATUS_VLAN_VALID
| TP_STATUS_VLAN_TPID_VALID
;
3043 aux
.tp_vlan_tci
= 0;
3044 aux
.tp_vlan_tpid
= 0;
3046 put_cmsg(msg
, SOL_PACKET
, PACKET_AUXDATA
, sizeof(aux
), &aux
);
3050 * Free or return the buffer as appropriate. Again this
3051 * hides all the races and re-entrancy issues from us.
3053 err
= vnet_hdr_len
+ ((flags
&MSG_TRUNC
) ? skb
->len
: copied
);
3056 skb_free_datagram(sk
, skb
);
3061 static int packet_getname_spkt(struct socket
*sock
, struct sockaddr
*uaddr
,
3062 int *uaddr_len
, int peer
)
3064 struct net_device
*dev
;
3065 struct sock
*sk
= sock
->sk
;
3070 uaddr
->sa_family
= AF_PACKET
;
3071 memset(uaddr
->sa_data
, 0, sizeof(uaddr
->sa_data
));
3073 dev
= dev_get_by_index_rcu(sock_net(sk
), pkt_sk(sk
)->ifindex
);
3075 strlcpy(uaddr
->sa_data
, dev
->name
, sizeof(uaddr
->sa_data
));
3077 *uaddr_len
= sizeof(*uaddr
);
3082 static int packet_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
3083 int *uaddr_len
, int peer
)
3085 struct net_device
*dev
;
3086 struct sock
*sk
= sock
->sk
;
3087 struct packet_sock
*po
= pkt_sk(sk
);
3088 DECLARE_SOCKADDR(struct sockaddr_ll
*, sll
, uaddr
);
3093 sll
->sll_family
= AF_PACKET
;
3094 sll
->sll_ifindex
= po
->ifindex
;
3095 sll
->sll_protocol
= po
->num
;
3096 sll
->sll_pkttype
= 0;
3098 dev
= dev_get_by_index_rcu(sock_net(sk
), po
->ifindex
);
3100 sll
->sll_hatype
= dev
->type
;
3101 sll
->sll_halen
= dev
->addr_len
;
3102 memcpy(sll
->sll_addr
, dev
->dev_addr
, dev
->addr_len
);
3104 sll
->sll_hatype
= 0; /* Bad: we have no ARPHRD_UNSPEC */
3108 *uaddr_len
= offsetof(struct sockaddr_ll
, sll_addr
) + sll
->sll_halen
;
3113 static int packet_dev_mc(struct net_device
*dev
, struct packet_mclist
*i
,
3117 case PACKET_MR_MULTICAST
:
3118 if (i
->alen
!= dev
->addr_len
)
3121 return dev_mc_add(dev
, i
->addr
);
3123 return dev_mc_del(dev
, i
->addr
);
3125 case PACKET_MR_PROMISC
:
3126 return dev_set_promiscuity(dev
, what
);
3127 case PACKET_MR_ALLMULTI
:
3128 return dev_set_allmulti(dev
, what
);
3129 case PACKET_MR_UNICAST
:
3130 if (i
->alen
!= dev
->addr_len
)
3133 return dev_uc_add(dev
, i
->addr
);
3135 return dev_uc_del(dev
, i
->addr
);
3143 static void packet_dev_mclist_delete(struct net_device
*dev
,
3144 struct packet_mclist
**mlp
)
3146 struct packet_mclist
*ml
;
3148 while ((ml
= *mlp
) != NULL
) {
3149 if (ml
->ifindex
== dev
->ifindex
) {
3150 packet_dev_mc(dev
, ml
, -1);
3158 static int packet_mc_add(struct sock
*sk
, struct packet_mreq_max
*mreq
)
3160 struct packet_sock
*po
= pkt_sk(sk
);
3161 struct packet_mclist
*ml
, *i
;
3162 struct net_device
*dev
;
3168 dev
= __dev_get_by_index(sock_net(sk
), mreq
->mr_ifindex
);
3173 if (mreq
->mr_alen
> dev
->addr_len
)
3177 i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
3182 for (ml
= po
->mclist
; ml
; ml
= ml
->next
) {
3183 if (ml
->ifindex
== mreq
->mr_ifindex
&&
3184 ml
->type
== mreq
->mr_type
&&
3185 ml
->alen
== mreq
->mr_alen
&&
3186 memcmp(ml
->addr
, mreq
->mr_address
, ml
->alen
) == 0) {
3188 /* Free the new element ... */
3194 i
->type
= mreq
->mr_type
;
3195 i
->ifindex
= mreq
->mr_ifindex
;
3196 i
->alen
= mreq
->mr_alen
;
3197 memcpy(i
->addr
, mreq
->mr_address
, i
->alen
);
3199 i
->next
= po
->mclist
;
3201 err
= packet_dev_mc(dev
, i
, 1);
3203 po
->mclist
= i
->next
;
3212 static int packet_mc_drop(struct sock
*sk
, struct packet_mreq_max
*mreq
)
3214 struct packet_mclist
*ml
, **mlp
;
3218 for (mlp
= &pkt_sk(sk
)->mclist
; (ml
= *mlp
) != NULL
; mlp
= &ml
->next
) {
3219 if (ml
->ifindex
== mreq
->mr_ifindex
&&
3220 ml
->type
== mreq
->mr_type
&&
3221 ml
->alen
== mreq
->mr_alen
&&
3222 memcmp(ml
->addr
, mreq
->mr_address
, ml
->alen
) == 0) {
3223 if (--ml
->count
== 0) {
3224 struct net_device
*dev
;
3226 dev
= __dev_get_by_index(sock_net(sk
), ml
->ifindex
);
3228 packet_dev_mc(dev
, ml
, -1);
3238 static void packet_flush_mclist(struct sock
*sk
)
3240 struct packet_sock
*po
= pkt_sk(sk
);
3241 struct packet_mclist
*ml
;
3247 while ((ml
= po
->mclist
) != NULL
) {
3248 struct net_device
*dev
;
3250 po
->mclist
= ml
->next
;
3251 dev
= __dev_get_by_index(sock_net(sk
), ml
->ifindex
);
3253 packet_dev_mc(dev
, ml
, -1);
3260 packet_setsockopt(struct socket
*sock
, int level
, int optname
, char __user
*optval
, unsigned int optlen
)
3262 struct sock
*sk
= sock
->sk
;
3263 struct packet_sock
*po
= pkt_sk(sk
);
3266 if (level
!= SOL_PACKET
)
3267 return -ENOPROTOOPT
;
3270 case PACKET_ADD_MEMBERSHIP
:
3271 case PACKET_DROP_MEMBERSHIP
:
3273 struct packet_mreq_max mreq
;
3275 memset(&mreq
, 0, sizeof(mreq
));
3276 if (len
< sizeof(struct packet_mreq
))
3278 if (len
> sizeof(mreq
))
3280 if (copy_from_user(&mreq
, optval
, len
))
3282 if (len
< (mreq
.mr_alen
+ offsetof(struct packet_mreq
, mr_address
)))
3284 if (optname
== PACKET_ADD_MEMBERSHIP
)
3285 ret
= packet_mc_add(sk
, &mreq
);
3287 ret
= packet_mc_drop(sk
, &mreq
);
3291 case PACKET_RX_RING
:
3292 case PACKET_TX_RING
:
3294 union tpacket_req_u req_u
;
3297 switch (po
->tp_version
) {
3300 len
= sizeof(req_u
.req
);
3304 len
= sizeof(req_u
.req3
);
3309 if (pkt_sk(sk
)->has_vnet_hdr
)
3311 if (copy_from_user(&req_u
.req
, optval
, len
))
3313 return packet_set_ring(sk
, &req_u
, 0,
3314 optname
== PACKET_TX_RING
);
3316 case PACKET_COPY_THRESH
:
3320 if (optlen
!= sizeof(val
))
3322 if (copy_from_user(&val
, optval
, sizeof(val
)))
3325 pkt_sk(sk
)->copy_thresh
= val
;
3328 case PACKET_VERSION
:
3332 if (optlen
!= sizeof(val
))
3334 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3336 if (copy_from_user(&val
, optval
, sizeof(val
)))
3342 po
->tp_version
= val
;
3348 case PACKET_RESERVE
:
3352 if (optlen
!= sizeof(val
))
3354 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3356 if (copy_from_user(&val
, optval
, sizeof(val
)))
3358 po
->tp_reserve
= val
;
3365 if (optlen
!= sizeof(val
))
3367 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3369 if (copy_from_user(&val
, optval
, sizeof(val
)))
3371 po
->tp_loss
= !!val
;
3374 case PACKET_AUXDATA
:
3378 if (optlen
< sizeof(val
))
3380 if (copy_from_user(&val
, optval
, sizeof(val
)))
3383 po
->auxdata
= !!val
;
3386 case PACKET_ORIGDEV
:
3390 if (optlen
< sizeof(val
))
3392 if (copy_from_user(&val
, optval
, sizeof(val
)))
3395 po
->origdev
= !!val
;
3398 case PACKET_VNET_HDR
:
3402 if (sock
->type
!= SOCK_RAW
)
3404 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3406 if (optlen
< sizeof(val
))
3408 if (copy_from_user(&val
, optval
, sizeof(val
)))
3411 po
->has_vnet_hdr
= !!val
;
3414 case PACKET_TIMESTAMP
:
3418 if (optlen
!= sizeof(val
))
3420 if (copy_from_user(&val
, optval
, sizeof(val
)))
3423 po
->tp_tstamp
= val
;
3430 if (optlen
!= sizeof(val
))
3432 if (copy_from_user(&val
, optval
, sizeof(val
)))
3435 return fanout_add(sk
, val
& 0xffff, val
>> 16);
3437 case PACKET_TX_HAS_OFF
:
3441 if (optlen
!= sizeof(val
))
3443 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3445 if (copy_from_user(&val
, optval
, sizeof(val
)))
3447 po
->tp_tx_has_off
= !!val
;
3450 case PACKET_QDISC_BYPASS
:
3454 if (optlen
!= sizeof(val
))
3456 if (copy_from_user(&val
, optval
, sizeof(val
)))
3459 po
->xmit
= val
? packet_direct_xmit
: dev_queue_xmit
;
3463 return -ENOPROTOOPT
;
3467 static int packet_getsockopt(struct socket
*sock
, int level
, int optname
,
3468 char __user
*optval
, int __user
*optlen
)
3471 int val
, lv
= sizeof(val
);
3472 struct sock
*sk
= sock
->sk
;
3473 struct packet_sock
*po
= pkt_sk(sk
);
3475 union tpacket_stats_u st
;
3477 if (level
!= SOL_PACKET
)
3478 return -ENOPROTOOPT
;
3480 if (get_user(len
, optlen
))
3487 case PACKET_STATISTICS
:
3488 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
3489 memcpy(&st
, &po
->stats
, sizeof(st
));
3490 memset(&po
->stats
, 0, sizeof(po
->stats
));
3491 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
3493 if (po
->tp_version
== TPACKET_V3
) {
3494 lv
= sizeof(struct tpacket_stats_v3
);
3495 st
.stats3
.tp_packets
+= st
.stats3
.tp_drops
;
3498 lv
= sizeof(struct tpacket_stats
);
3499 st
.stats1
.tp_packets
+= st
.stats1
.tp_drops
;
3504 case PACKET_AUXDATA
:
3507 case PACKET_ORIGDEV
:
3510 case PACKET_VNET_HDR
:
3511 val
= po
->has_vnet_hdr
;
3513 case PACKET_VERSION
:
3514 val
= po
->tp_version
;
3517 if (len
> sizeof(int))
3519 if (copy_from_user(&val
, optval
, len
))
3523 val
= sizeof(struct tpacket_hdr
);
3526 val
= sizeof(struct tpacket2_hdr
);
3529 val
= sizeof(struct tpacket3_hdr
);
3535 case PACKET_RESERVE
:
3536 val
= po
->tp_reserve
;
3541 case PACKET_TIMESTAMP
:
3542 val
= po
->tp_tstamp
;
3546 ((u32
)po
->fanout
->id
|
3547 ((u32
)po
->fanout
->type
<< 16) |
3548 ((u32
)po
->fanout
->flags
<< 24)) :
3551 case PACKET_TX_HAS_OFF
:
3552 val
= po
->tp_tx_has_off
;
3554 case PACKET_QDISC_BYPASS
:
3555 val
= packet_use_direct_xmit(po
);
3558 return -ENOPROTOOPT
;
3563 if (put_user(len
, optlen
))
3565 if (copy_to_user(optval
, data
, len
))
3571 static int packet_notifier(struct notifier_block
*this,
3572 unsigned long msg
, void *ptr
)
3575 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
3576 struct net
*net
= dev_net(dev
);
3579 sk_for_each_rcu(sk
, &net
->packet
.sklist
) {
3580 struct packet_sock
*po
= pkt_sk(sk
);
3583 case NETDEV_UNREGISTER
:
3585 packet_dev_mclist_delete(dev
, &po
->mclist
);
3589 if (dev
->ifindex
== po
->ifindex
) {
3590 spin_lock(&po
->bind_lock
);
3592 __unregister_prot_hook(sk
, false);
3593 sk
->sk_err
= ENETDOWN
;
3594 if (!sock_flag(sk
, SOCK_DEAD
))
3595 sk
->sk_error_report(sk
);
3597 if (msg
== NETDEV_UNREGISTER
) {
3598 packet_cached_dev_reset(po
);
3600 if (po
->prot_hook
.dev
)
3601 dev_put(po
->prot_hook
.dev
);
3602 po
->prot_hook
.dev
= NULL
;
3604 spin_unlock(&po
->bind_lock
);
3608 if (dev
->ifindex
== po
->ifindex
) {
3609 spin_lock(&po
->bind_lock
);
3611 register_prot_hook(sk
);
3612 spin_unlock(&po
->bind_lock
);
3622 static int packet_ioctl(struct socket
*sock
, unsigned int cmd
,
3625 struct sock
*sk
= sock
->sk
;
3630 int amount
= sk_wmem_alloc_get(sk
);
3632 return put_user(amount
, (int __user
*)arg
);
3636 struct sk_buff
*skb
;
3639 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
3640 skb
= skb_peek(&sk
->sk_receive_queue
);
3643 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
3644 return put_user(amount
, (int __user
*)arg
);
3647 return sock_get_timestamp(sk
, (struct timeval __user
*)arg
);
3649 return sock_get_timestampns(sk
, (struct timespec __user
*)arg
);
3659 case SIOCGIFBRDADDR
:
3660 case SIOCSIFBRDADDR
:
3661 case SIOCGIFNETMASK
:
3662 case SIOCSIFNETMASK
:
3663 case SIOCGIFDSTADDR
:
3664 case SIOCSIFDSTADDR
:
3666 return inet_dgram_ops
.ioctl(sock
, cmd
, arg
);
3670 return -ENOIOCTLCMD
;
3675 static unsigned int packet_poll(struct file
*file
, struct socket
*sock
,
3678 struct sock
*sk
= sock
->sk
;
3679 struct packet_sock
*po
= pkt_sk(sk
);
3680 unsigned int mask
= datagram_poll(file
, sock
, wait
);
3682 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
3683 if (po
->rx_ring
.pg_vec
) {
3684 if (!packet_previous_rx_frame(po
, &po
->rx_ring
,
3686 mask
|= POLLIN
| POLLRDNORM
;
3688 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
3689 spin_lock_bh(&sk
->sk_write_queue
.lock
);
3690 if (po
->tx_ring
.pg_vec
) {
3691 if (packet_current_frame(po
, &po
->tx_ring
, TP_STATUS_AVAILABLE
))
3692 mask
|= POLLOUT
| POLLWRNORM
;
3694 spin_unlock_bh(&sk
->sk_write_queue
.lock
);
3699 /* Dirty? Well, I still did not learn better way to account
3703 static void packet_mm_open(struct vm_area_struct
*vma
)
3705 struct file
*file
= vma
->vm_file
;
3706 struct socket
*sock
= file
->private_data
;
3707 struct sock
*sk
= sock
->sk
;
3710 atomic_inc(&pkt_sk(sk
)->mapped
);
3713 static void packet_mm_close(struct vm_area_struct
*vma
)
3715 struct file
*file
= vma
->vm_file
;
3716 struct socket
*sock
= file
->private_data
;
3717 struct sock
*sk
= sock
->sk
;
3720 atomic_dec(&pkt_sk(sk
)->mapped
);
3723 static const struct vm_operations_struct packet_mmap_ops
= {
3724 .open
= packet_mm_open
,
3725 .close
= packet_mm_close
,
3728 static void free_pg_vec(struct pgv
*pg_vec
, unsigned int order
,
3733 for (i
= 0; i
< len
; i
++) {
3734 if (likely(pg_vec
[i
].buffer
)) {
3735 if (is_vmalloc_addr(pg_vec
[i
].buffer
))
3736 vfree(pg_vec
[i
].buffer
);
3738 free_pages((unsigned long)pg_vec
[i
].buffer
,
3740 pg_vec
[i
].buffer
= NULL
;
3746 static char *alloc_one_pg_vec_page(unsigned long order
)
3749 gfp_t gfp_flags
= GFP_KERNEL
| __GFP_COMP
|
3750 __GFP_ZERO
| __GFP_NOWARN
| __GFP_NORETRY
;
3752 buffer
= (char *) __get_free_pages(gfp_flags
, order
);
3756 /* __get_free_pages failed, fall back to vmalloc */
3757 buffer
= vzalloc((1 << order
) * PAGE_SIZE
);
3761 /* vmalloc failed, lets dig into swap here */
3762 gfp_flags
&= ~__GFP_NORETRY
;
3763 buffer
= (char *) __get_free_pages(gfp_flags
, order
);
3767 /* complete and utter failure */
3771 static struct pgv
*alloc_pg_vec(struct tpacket_req
*req
, int order
)
3773 unsigned int block_nr
= req
->tp_block_nr
;
3777 pg_vec
= kcalloc(block_nr
, sizeof(struct pgv
), GFP_KERNEL
);
3778 if (unlikely(!pg_vec
))
3781 for (i
= 0; i
< block_nr
; i
++) {
3782 pg_vec
[i
].buffer
= alloc_one_pg_vec_page(order
);
3783 if (unlikely(!pg_vec
[i
].buffer
))
3784 goto out_free_pgvec
;
3791 free_pg_vec(pg_vec
, order
, block_nr
);
3796 static int packet_set_ring(struct sock
*sk
, union tpacket_req_u
*req_u
,
3797 int closing
, int tx_ring
)
3799 struct pgv
*pg_vec
= NULL
;
3800 struct packet_sock
*po
= pkt_sk(sk
);
3801 int was_running
, order
= 0;
3802 struct packet_ring_buffer
*rb
;
3803 struct sk_buff_head
*rb_queue
;
3806 /* Added to avoid minimal code churn */
3807 struct tpacket_req
*req
= &req_u
->req
;
3809 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
3810 if (!closing
&& tx_ring
&& (po
->tp_version
> TPACKET_V2
)) {
3811 WARN(1, "Tx-ring is not supported.\n");
3815 rb
= tx_ring
? &po
->tx_ring
: &po
->rx_ring
;
3816 rb_queue
= tx_ring
? &sk
->sk_write_queue
: &sk
->sk_receive_queue
;
3820 if (atomic_read(&po
->mapped
))
3822 if (packet_read_pending(rb
))
3826 if (req
->tp_block_nr
) {
3827 /* Sanity tests and some calculations */
3829 if (unlikely(rb
->pg_vec
))
3832 switch (po
->tp_version
) {
3834 po
->tp_hdrlen
= TPACKET_HDRLEN
;
3837 po
->tp_hdrlen
= TPACKET2_HDRLEN
;
3840 po
->tp_hdrlen
= TPACKET3_HDRLEN
;
3845 if (unlikely((int)req
->tp_block_size
<= 0))
3847 if (unlikely(req
->tp_block_size
& (PAGE_SIZE
- 1)))
3849 if (po
->tp_version
>= TPACKET_V3
&&
3850 (int)(req
->tp_block_size
-
3851 BLK_PLUS_PRIV(req_u
->req3
.tp_sizeof_priv
)) <= 0)
3853 if (unlikely(req
->tp_frame_size
< po
->tp_hdrlen
+
3856 if (unlikely(req
->tp_frame_size
& (TPACKET_ALIGNMENT
- 1)))
3859 rb
->frames_per_block
= req
->tp_block_size
/req
->tp_frame_size
;
3860 if (unlikely(rb
->frames_per_block
<= 0))
3862 if (unlikely((rb
->frames_per_block
* req
->tp_block_nr
) !=
3867 order
= get_order(req
->tp_block_size
);
3868 pg_vec
= alloc_pg_vec(req
, order
);
3869 if (unlikely(!pg_vec
))
3871 switch (po
->tp_version
) {
3873 /* Transmit path is not supported. We checked
3874 * it above but just being paranoid
3877 init_prb_bdqc(po
, rb
, pg_vec
, req_u
, tx_ring
);
3886 if (unlikely(req
->tp_frame_nr
))
3892 /* Detach socket from network */
3893 spin_lock(&po
->bind_lock
);
3894 was_running
= po
->running
;
3898 __unregister_prot_hook(sk
, false);
3900 spin_unlock(&po
->bind_lock
);
3905 mutex_lock(&po
->pg_vec_lock
);
3906 if (closing
|| atomic_read(&po
->mapped
) == 0) {
3908 spin_lock_bh(&rb_queue
->lock
);
3909 swap(rb
->pg_vec
, pg_vec
);
3910 rb
->frame_max
= (req
->tp_frame_nr
- 1);
3912 rb
->frame_size
= req
->tp_frame_size
;
3913 spin_unlock_bh(&rb_queue
->lock
);
3915 swap(rb
->pg_vec_order
, order
);
3916 swap(rb
->pg_vec_len
, req
->tp_block_nr
);
3918 rb
->pg_vec_pages
= req
->tp_block_size
/PAGE_SIZE
;
3919 po
->prot_hook
.func
= (po
->rx_ring
.pg_vec
) ?
3920 tpacket_rcv
: packet_rcv
;
3921 skb_queue_purge(rb_queue
);
3922 if (atomic_read(&po
->mapped
))
3923 pr_err("packet_mmap: vma is busy: %d\n",
3924 atomic_read(&po
->mapped
));
3926 mutex_unlock(&po
->pg_vec_lock
);
3928 spin_lock(&po
->bind_lock
);
3931 register_prot_hook(sk
);
3933 spin_unlock(&po
->bind_lock
);
3934 if (closing
&& (po
->tp_version
> TPACKET_V2
)) {
3935 /* Because we don't support block-based V3 on tx-ring */
3937 prb_shutdown_retire_blk_timer(po
, tx_ring
, rb_queue
);
3942 free_pg_vec(pg_vec
, order
, req
->tp_block_nr
);
3947 static int packet_mmap(struct file
*file
, struct socket
*sock
,
3948 struct vm_area_struct
*vma
)
3950 struct sock
*sk
= sock
->sk
;
3951 struct packet_sock
*po
= pkt_sk(sk
);
3952 unsigned long size
, expected_size
;
3953 struct packet_ring_buffer
*rb
;
3954 unsigned long start
;
3961 mutex_lock(&po
->pg_vec_lock
);
3964 for (rb
= &po
->rx_ring
; rb
<= &po
->tx_ring
; rb
++) {
3966 expected_size
+= rb
->pg_vec_len
3972 if (expected_size
== 0)
3975 size
= vma
->vm_end
- vma
->vm_start
;
3976 if (size
!= expected_size
)
3979 start
= vma
->vm_start
;
3980 for (rb
= &po
->rx_ring
; rb
<= &po
->tx_ring
; rb
++) {
3981 if (rb
->pg_vec
== NULL
)
3984 for (i
= 0; i
< rb
->pg_vec_len
; i
++) {
3986 void *kaddr
= rb
->pg_vec
[i
].buffer
;
3989 for (pg_num
= 0; pg_num
< rb
->pg_vec_pages
; pg_num
++) {
3990 page
= pgv_to_page(kaddr
);
3991 err
= vm_insert_page(vma
, start
, page
);
4000 atomic_inc(&po
->mapped
);
4001 vma
->vm_ops
= &packet_mmap_ops
;
4005 mutex_unlock(&po
->pg_vec_lock
);
4009 static const struct proto_ops packet_ops_spkt
= {
4010 .family
= PF_PACKET
,
4011 .owner
= THIS_MODULE
,
4012 .release
= packet_release
,
4013 .bind
= packet_bind_spkt
,
4014 .connect
= sock_no_connect
,
4015 .socketpair
= sock_no_socketpair
,
4016 .accept
= sock_no_accept
,
4017 .getname
= packet_getname_spkt
,
4018 .poll
= datagram_poll
,
4019 .ioctl
= packet_ioctl
,
4020 .listen
= sock_no_listen
,
4021 .shutdown
= sock_no_shutdown
,
4022 .setsockopt
= sock_no_setsockopt
,
4023 .getsockopt
= sock_no_getsockopt
,
4024 .sendmsg
= packet_sendmsg_spkt
,
4025 .recvmsg
= packet_recvmsg
,
4026 .mmap
= sock_no_mmap
,
4027 .sendpage
= sock_no_sendpage
,
4030 static const struct proto_ops packet_ops
= {
4031 .family
= PF_PACKET
,
4032 .owner
= THIS_MODULE
,
4033 .release
= packet_release
,
4034 .bind
= packet_bind
,
4035 .connect
= sock_no_connect
,
4036 .socketpair
= sock_no_socketpair
,
4037 .accept
= sock_no_accept
,
4038 .getname
= packet_getname
,
4039 .poll
= packet_poll
,
4040 .ioctl
= packet_ioctl
,
4041 .listen
= sock_no_listen
,
4042 .shutdown
= sock_no_shutdown
,
4043 .setsockopt
= packet_setsockopt
,
4044 .getsockopt
= packet_getsockopt
,
4045 .sendmsg
= packet_sendmsg
,
4046 .recvmsg
= packet_recvmsg
,
4047 .mmap
= packet_mmap
,
4048 .sendpage
= sock_no_sendpage
,
4051 static const struct net_proto_family packet_family_ops
= {
4052 .family
= PF_PACKET
,
4053 .create
= packet_create
,
4054 .owner
= THIS_MODULE
,
4057 static struct notifier_block packet_netdev_notifier
= {
4058 .notifier_call
= packet_notifier
,
4061 #ifdef CONFIG_PROC_FS
4063 static void *packet_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4066 struct net
*net
= seq_file_net(seq
);
4069 return seq_hlist_start_head_rcu(&net
->packet
.sklist
, *pos
);
4072 static void *packet_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4074 struct net
*net
= seq_file_net(seq
);
4075 return seq_hlist_next_rcu(v
, &net
->packet
.sklist
, pos
);
4078 static void packet_seq_stop(struct seq_file
*seq
, void *v
)
4084 static int packet_seq_show(struct seq_file
*seq
, void *v
)
4086 if (v
== SEQ_START_TOKEN
)
4087 seq_puts(seq
, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4089 struct sock
*s
= sk_entry(v
);
4090 const struct packet_sock
*po
= pkt_sk(s
);
4093 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
4095 atomic_read(&s
->sk_refcnt
),
4100 atomic_read(&s
->sk_rmem_alloc
),
4101 from_kuid_munged(seq_user_ns(seq
), sock_i_uid(s
)),
4108 static const struct seq_operations packet_seq_ops
= {
4109 .start
= packet_seq_start
,
4110 .next
= packet_seq_next
,
4111 .stop
= packet_seq_stop
,
4112 .show
= packet_seq_show
,
4115 static int packet_seq_open(struct inode
*inode
, struct file
*file
)
4117 return seq_open_net(inode
, file
, &packet_seq_ops
,
4118 sizeof(struct seq_net_private
));
4121 static const struct file_operations packet_seq_fops
= {
4122 .owner
= THIS_MODULE
,
4123 .open
= packet_seq_open
,
4125 .llseek
= seq_lseek
,
4126 .release
= seq_release_net
,
4131 static int __net_init
packet_net_init(struct net
*net
)
4133 mutex_init(&net
->packet
.sklist_lock
);
4134 INIT_HLIST_HEAD(&net
->packet
.sklist
);
4136 if (!proc_create("packet", 0, net
->proc_net
, &packet_seq_fops
))
4142 static void __net_exit
packet_net_exit(struct net
*net
)
4144 remove_proc_entry("packet", net
->proc_net
);
4147 static struct pernet_operations packet_net_ops
= {
4148 .init
= packet_net_init
,
4149 .exit
= packet_net_exit
,
4153 static void __exit
packet_exit(void)
4155 unregister_netdevice_notifier(&packet_netdev_notifier
);
4156 unregister_pernet_subsys(&packet_net_ops
);
4157 sock_unregister(PF_PACKET
);
4158 proto_unregister(&packet_proto
);
4161 static int __init
packet_init(void)
4163 int rc
= proto_register(&packet_proto
, 0);
4168 sock_register(&packet_family_ops
);
4169 register_pernet_subsys(&packet_net_ops
);
4170 register_netdevice_notifier(&packet_netdev_notifier
);
4175 module_init(packet_init
);
4176 module_exit(packet_exit
);
4177 MODULE_LICENSE("GPL");
4178 MODULE_ALIAS_NETPROTO(PF_PACKET
);