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
{
219 unsigned int origlen
;
221 struct sockaddr_pkt pkt
;
222 struct sockaddr_ll ll
;
226 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
228 #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
229 #define GET_PBLOCK_DESC(x, bid) \
230 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
231 #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
232 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
233 #define GET_NEXT_PRB_BLK_NUM(x) \
234 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
235 ((x)->kactive_blk_num+1) : 0)
237 static void __fanout_unlink(struct sock
*sk
, struct packet_sock
*po
);
238 static void __fanout_link(struct sock
*sk
, struct packet_sock
*po
);
240 static int packet_direct_xmit(struct sk_buff
*skb
)
242 struct net_device
*dev
= skb
->dev
;
243 netdev_features_t features
;
244 struct netdev_queue
*txq
;
245 int ret
= NETDEV_TX_BUSY
;
247 if (unlikely(!netif_running(dev
) ||
248 !netif_carrier_ok(dev
)))
251 features
= netif_skb_features(skb
);
252 if (skb_needs_linearize(skb
, features
) &&
253 __skb_linearize(skb
))
256 txq
= skb_get_tx_queue(dev
, skb
);
260 HARD_TX_LOCK(dev
, txq
, smp_processor_id());
261 if (!netif_xmit_frozen_or_drv_stopped(txq
))
262 ret
= netdev_start_xmit(skb
, dev
, txq
, false);
263 HARD_TX_UNLOCK(dev
, txq
);
267 if (!dev_xmit_complete(ret
))
272 atomic_long_inc(&dev
->tx_dropped
);
274 return NET_XMIT_DROP
;
277 static struct net_device
*packet_cached_dev_get(struct packet_sock
*po
)
279 struct net_device
*dev
;
282 dev
= rcu_dereference(po
->cached_dev
);
290 static void packet_cached_dev_assign(struct packet_sock
*po
,
291 struct net_device
*dev
)
293 rcu_assign_pointer(po
->cached_dev
, dev
);
296 static void packet_cached_dev_reset(struct packet_sock
*po
)
298 RCU_INIT_POINTER(po
->cached_dev
, NULL
);
301 static bool packet_use_direct_xmit(const struct packet_sock
*po
)
303 return po
->xmit
== packet_direct_xmit
;
306 static u16
__packet_pick_tx_queue(struct net_device
*dev
, struct sk_buff
*skb
)
308 return (u16
) raw_smp_processor_id() % dev
->real_num_tx_queues
;
311 static void packet_pick_tx_queue(struct net_device
*dev
, struct sk_buff
*skb
)
313 const struct net_device_ops
*ops
= dev
->netdev_ops
;
316 if (ops
->ndo_select_queue
) {
317 queue_index
= ops
->ndo_select_queue(dev
, skb
, NULL
,
318 __packet_pick_tx_queue
);
319 queue_index
= netdev_cap_txqueue(dev
, queue_index
);
321 queue_index
= __packet_pick_tx_queue(dev
, skb
);
324 skb_set_queue_mapping(skb
, queue_index
);
327 /* register_prot_hook must be invoked with the po->bind_lock held,
328 * or from a context in which asynchronous accesses to the packet
329 * socket is not possible (packet_create()).
331 static void register_prot_hook(struct sock
*sk
)
333 struct packet_sock
*po
= pkt_sk(sk
);
337 __fanout_link(sk
, po
);
339 dev_add_pack(&po
->prot_hook
);
346 /* {,__}unregister_prot_hook() must be invoked with the po->bind_lock
347 * held. If the sync parameter is true, we will temporarily drop
348 * the po->bind_lock and do a synchronize_net to make sure no
349 * asynchronous packet processing paths still refer to the elements
350 * of po->prot_hook. If the sync parameter is false, it is the
351 * callers responsibility to take care of this.
353 static void __unregister_prot_hook(struct sock
*sk
, bool sync
)
355 struct packet_sock
*po
= pkt_sk(sk
);
360 __fanout_unlink(sk
, po
);
362 __dev_remove_pack(&po
->prot_hook
);
367 spin_unlock(&po
->bind_lock
);
369 spin_lock(&po
->bind_lock
);
373 static void unregister_prot_hook(struct sock
*sk
, bool sync
)
375 struct packet_sock
*po
= pkt_sk(sk
);
378 __unregister_prot_hook(sk
, sync
);
381 static inline struct page
* __pure
pgv_to_page(void *addr
)
383 if (is_vmalloc_addr(addr
))
384 return vmalloc_to_page(addr
);
385 return virt_to_page(addr
);
388 static void __packet_set_status(struct packet_sock
*po
, void *frame
, int status
)
390 union tpacket_uhdr h
;
393 switch (po
->tp_version
) {
395 h
.h1
->tp_status
= status
;
396 flush_dcache_page(pgv_to_page(&h
.h1
->tp_status
));
399 h
.h2
->tp_status
= status
;
400 flush_dcache_page(pgv_to_page(&h
.h2
->tp_status
));
404 WARN(1, "TPACKET version not supported.\n");
411 static int __packet_get_status(struct packet_sock
*po
, void *frame
)
413 union tpacket_uhdr h
;
418 switch (po
->tp_version
) {
420 flush_dcache_page(pgv_to_page(&h
.h1
->tp_status
));
421 return h
.h1
->tp_status
;
423 flush_dcache_page(pgv_to_page(&h
.h2
->tp_status
));
424 return h
.h2
->tp_status
;
427 WARN(1, "TPACKET version not supported.\n");
433 static __u32
tpacket_get_timestamp(struct sk_buff
*skb
, struct timespec
*ts
,
436 struct skb_shared_hwtstamps
*shhwtstamps
= skb_hwtstamps(skb
);
439 (flags
& SOF_TIMESTAMPING_RAW_HARDWARE
) &&
440 ktime_to_timespec_cond(shhwtstamps
->hwtstamp
, ts
))
441 return TP_STATUS_TS_RAW_HARDWARE
;
443 if (ktime_to_timespec_cond(skb
->tstamp
, ts
))
444 return TP_STATUS_TS_SOFTWARE
;
449 static __u32
__packet_set_timestamp(struct packet_sock
*po
, void *frame
,
452 union tpacket_uhdr h
;
456 if (!(ts_status
= tpacket_get_timestamp(skb
, &ts
, po
->tp_tstamp
)))
460 switch (po
->tp_version
) {
462 h
.h1
->tp_sec
= ts
.tv_sec
;
463 h
.h1
->tp_usec
= ts
.tv_nsec
/ NSEC_PER_USEC
;
466 h
.h2
->tp_sec
= ts
.tv_sec
;
467 h
.h2
->tp_nsec
= ts
.tv_nsec
;
471 WARN(1, "TPACKET version not supported.\n");
475 /* one flush is safe, as both fields always lie on the same cacheline */
476 flush_dcache_page(pgv_to_page(&h
.h1
->tp_sec
));
482 static void *packet_lookup_frame(struct packet_sock
*po
,
483 struct packet_ring_buffer
*rb
,
484 unsigned int position
,
487 unsigned int pg_vec_pos
, frame_offset
;
488 union tpacket_uhdr h
;
490 pg_vec_pos
= position
/ rb
->frames_per_block
;
491 frame_offset
= position
% rb
->frames_per_block
;
493 h
.raw
= rb
->pg_vec
[pg_vec_pos
].buffer
+
494 (frame_offset
* rb
->frame_size
);
496 if (status
!= __packet_get_status(po
, h
.raw
))
502 static void *packet_current_frame(struct packet_sock
*po
,
503 struct packet_ring_buffer
*rb
,
506 return packet_lookup_frame(po
, rb
, rb
->head
, status
);
509 static void prb_del_retire_blk_timer(struct tpacket_kbdq_core
*pkc
)
511 del_timer_sync(&pkc
->retire_blk_timer
);
514 static void prb_shutdown_retire_blk_timer(struct packet_sock
*po
,
516 struct sk_buff_head
*rb_queue
)
518 struct tpacket_kbdq_core
*pkc
;
520 pkc
= tx_ring
? GET_PBDQC_FROM_RB(&po
->tx_ring
) :
521 GET_PBDQC_FROM_RB(&po
->rx_ring
);
523 spin_lock_bh(&rb_queue
->lock
);
524 pkc
->delete_blk_timer
= 1;
525 spin_unlock_bh(&rb_queue
->lock
);
527 prb_del_retire_blk_timer(pkc
);
530 static void prb_init_blk_timer(struct packet_sock
*po
,
531 struct tpacket_kbdq_core
*pkc
,
532 void (*func
) (unsigned long))
534 init_timer(&pkc
->retire_blk_timer
);
535 pkc
->retire_blk_timer
.data
= (long)po
;
536 pkc
->retire_blk_timer
.function
= func
;
537 pkc
->retire_blk_timer
.expires
= jiffies
;
540 static void prb_setup_retire_blk_timer(struct packet_sock
*po
, int tx_ring
)
542 struct tpacket_kbdq_core
*pkc
;
547 pkc
= tx_ring
? GET_PBDQC_FROM_RB(&po
->tx_ring
) :
548 GET_PBDQC_FROM_RB(&po
->rx_ring
);
549 prb_init_blk_timer(po
, pkc
, prb_retire_rx_blk_timer_expired
);
552 static int prb_calc_retire_blk_tmo(struct packet_sock
*po
,
553 int blk_size_in_bytes
)
555 struct net_device
*dev
;
556 unsigned int mbits
= 0, msec
= 0, div
= 0, tmo
= 0;
557 struct ethtool_cmd ecmd
;
562 dev
= __dev_get_by_index(sock_net(&po
->sk
), po
->ifindex
);
563 if (unlikely(!dev
)) {
565 return DEFAULT_PRB_RETIRE_TOV
;
567 err
= __ethtool_get_settings(dev
, &ecmd
);
568 speed
= ethtool_cmd_speed(&ecmd
);
572 * If the link speed is so slow you don't really
573 * need to worry about perf anyways
575 if (speed
< SPEED_1000
|| speed
== SPEED_UNKNOWN
) {
576 return DEFAULT_PRB_RETIRE_TOV
;
583 mbits
= (blk_size_in_bytes
* 8) / (1024 * 1024);
595 static void prb_init_ft_ops(struct tpacket_kbdq_core
*p1
,
596 union tpacket_req_u
*req_u
)
598 p1
->feature_req_word
= req_u
->req3
.tp_feature_req_word
;
601 static void init_prb_bdqc(struct packet_sock
*po
,
602 struct packet_ring_buffer
*rb
,
604 union tpacket_req_u
*req_u
, int tx_ring
)
606 struct tpacket_kbdq_core
*p1
= GET_PBDQC_FROM_RB(rb
);
607 struct tpacket_block_desc
*pbd
;
609 memset(p1
, 0x0, sizeof(*p1
));
611 p1
->knxt_seq_num
= 1;
613 pbd
= (struct tpacket_block_desc
*)pg_vec
[0].buffer
;
614 p1
->pkblk_start
= pg_vec
[0].buffer
;
615 p1
->kblk_size
= req_u
->req3
.tp_block_size
;
616 p1
->knum_blocks
= req_u
->req3
.tp_block_nr
;
617 p1
->hdrlen
= po
->tp_hdrlen
;
618 p1
->version
= po
->tp_version
;
619 p1
->last_kactive_blk_num
= 0;
620 po
->stats
.stats3
.tp_freeze_q_cnt
= 0;
621 if (req_u
->req3
.tp_retire_blk_tov
)
622 p1
->retire_blk_tov
= req_u
->req3
.tp_retire_blk_tov
;
624 p1
->retire_blk_tov
= prb_calc_retire_blk_tmo(po
,
625 req_u
->req3
.tp_block_size
);
626 p1
->tov_in_jiffies
= msecs_to_jiffies(p1
->retire_blk_tov
);
627 p1
->blk_sizeof_priv
= req_u
->req3
.tp_sizeof_priv
;
629 p1
->max_frame_len
= p1
->kblk_size
- BLK_PLUS_PRIV(p1
->blk_sizeof_priv
);
630 prb_init_ft_ops(p1
, req_u
);
631 prb_setup_retire_blk_timer(po
, tx_ring
);
632 prb_open_block(p1
, pbd
);
635 /* Do NOT update the last_blk_num first.
636 * Assumes sk_buff_head lock is held.
638 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core
*pkc
)
640 mod_timer(&pkc
->retire_blk_timer
,
641 jiffies
+ pkc
->tov_in_jiffies
);
642 pkc
->last_kactive_blk_num
= pkc
->kactive_blk_num
;
647 * 1) We refresh the timer only when we open a block.
648 * By doing this we don't waste cycles refreshing the timer
649 * on packet-by-packet basis.
651 * With a 1MB block-size, on a 1Gbps line, it will take
652 * i) ~8 ms to fill a block + ii) memcpy etc.
653 * In this cut we are not accounting for the memcpy time.
655 * So, if the user sets the 'tmo' to 10ms then the timer
656 * will never fire while the block is still getting filled
657 * (which is what we want). However, the user could choose
658 * to close a block early and that's fine.
660 * But when the timer does fire, we check whether or not to refresh it.
661 * Since the tmo granularity is in msecs, it is not too expensive
662 * to refresh the timer, lets say every '8' msecs.
663 * Either the user can set the 'tmo' or we can derive it based on
664 * a) line-speed and b) block-size.
665 * prb_calc_retire_blk_tmo() calculates the tmo.
668 static void prb_retire_rx_blk_timer_expired(unsigned long data
)
670 struct packet_sock
*po
= (struct packet_sock
*)data
;
671 struct tpacket_kbdq_core
*pkc
= GET_PBDQC_FROM_RB(&po
->rx_ring
);
673 struct tpacket_block_desc
*pbd
;
675 spin_lock(&po
->sk
.sk_receive_queue
.lock
);
677 frozen
= prb_queue_frozen(pkc
);
678 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
680 if (unlikely(pkc
->delete_blk_timer
))
683 /* We only need to plug the race when the block is partially filled.
685 * lock(); increment BLOCK_NUM_PKTS; unlock()
686 * copy_bits() is in progress ...
687 * timer fires on other cpu:
688 * we can't retire the current block because copy_bits
692 if (BLOCK_NUM_PKTS(pbd
)) {
693 while (atomic_read(&pkc
->blk_fill_in_prog
)) {
694 /* Waiting for skb_copy_bits to finish... */
699 if (pkc
->last_kactive_blk_num
== pkc
->kactive_blk_num
) {
701 prb_retire_current_block(pkc
, po
, TP_STATUS_BLK_TMO
);
702 if (!prb_dispatch_next_block(pkc
, po
))
707 /* Case 1. Queue was frozen because user-space was
710 if (prb_curr_blk_in_use(pkc
, pbd
)) {
712 * Ok, user-space is still behind.
713 * So just refresh the timer.
717 /* Case 2. queue was frozen,user-space caught up,
718 * now the link went idle && the timer fired.
719 * We don't have a block to close.So we open this
720 * block and restart the timer.
721 * opening a block thaws the queue,restarts timer
722 * Thawing/timer-refresh is a side effect.
724 prb_open_block(pkc
, pbd
);
731 _prb_refresh_rx_retire_blk_timer(pkc
);
734 spin_unlock(&po
->sk
.sk_receive_queue
.lock
);
737 static void prb_flush_block(struct tpacket_kbdq_core
*pkc1
,
738 struct tpacket_block_desc
*pbd1
, __u32 status
)
740 /* Flush everything minus the block header */
742 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
747 /* Skip the block header(we know header WILL fit in 4K) */
750 end
= (u8
*)PAGE_ALIGN((unsigned long)pkc1
->pkblk_end
);
751 for (; start
< end
; start
+= PAGE_SIZE
)
752 flush_dcache_page(pgv_to_page(start
));
757 /* Now update the block status. */
759 BLOCK_STATUS(pbd1
) = status
;
761 /* Flush the block header */
763 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
765 flush_dcache_page(pgv_to_page(start
));
775 * 2) Increment active_blk_num
777 * Note:We DONT refresh the timer on purpose.
778 * Because almost always the next block will be opened.
780 static void prb_close_block(struct tpacket_kbdq_core
*pkc1
,
781 struct tpacket_block_desc
*pbd1
,
782 struct packet_sock
*po
, unsigned int stat
)
784 __u32 status
= TP_STATUS_USER
| stat
;
786 struct tpacket3_hdr
*last_pkt
;
787 struct tpacket_hdr_v1
*h1
= &pbd1
->hdr
.bh1
;
789 if (po
->stats
.stats3
.tp_drops
)
790 status
|= TP_STATUS_LOSING
;
792 last_pkt
= (struct tpacket3_hdr
*)pkc1
->prev
;
793 last_pkt
->tp_next_offset
= 0;
795 /* Get the ts of the last pkt */
796 if (BLOCK_NUM_PKTS(pbd1
)) {
797 h1
->ts_last_pkt
.ts_sec
= last_pkt
->tp_sec
;
798 h1
->ts_last_pkt
.ts_nsec
= last_pkt
->tp_nsec
;
800 /* Ok, we tmo'd - so get the current time */
803 h1
->ts_last_pkt
.ts_sec
= ts
.tv_sec
;
804 h1
->ts_last_pkt
.ts_nsec
= ts
.tv_nsec
;
809 /* Flush the block */
810 prb_flush_block(pkc1
, pbd1
, status
);
812 pkc1
->kactive_blk_num
= GET_NEXT_PRB_BLK_NUM(pkc1
);
815 static void prb_thaw_queue(struct tpacket_kbdq_core
*pkc
)
817 pkc
->reset_pending_on_curr_blk
= 0;
821 * Side effect of opening a block:
823 * 1) prb_queue is thawed.
824 * 2) retire_blk_timer is refreshed.
827 static void prb_open_block(struct tpacket_kbdq_core
*pkc1
,
828 struct tpacket_block_desc
*pbd1
)
831 struct tpacket_hdr_v1
*h1
= &pbd1
->hdr
.bh1
;
835 /* We could have just memset this but we will lose the
836 * flexibility of making the priv area sticky
839 BLOCK_SNUM(pbd1
) = pkc1
->knxt_seq_num
++;
840 BLOCK_NUM_PKTS(pbd1
) = 0;
841 BLOCK_LEN(pbd1
) = BLK_PLUS_PRIV(pkc1
->blk_sizeof_priv
);
845 h1
->ts_first_pkt
.ts_sec
= ts
.tv_sec
;
846 h1
->ts_first_pkt
.ts_nsec
= ts
.tv_nsec
;
848 pkc1
->pkblk_start
= (char *)pbd1
;
849 pkc1
->nxt_offset
= pkc1
->pkblk_start
+ BLK_PLUS_PRIV(pkc1
->blk_sizeof_priv
);
851 BLOCK_O2FP(pbd1
) = (__u32
)BLK_PLUS_PRIV(pkc1
->blk_sizeof_priv
);
852 BLOCK_O2PRIV(pbd1
) = BLK_HDR_LEN
;
854 pbd1
->version
= pkc1
->version
;
855 pkc1
->prev
= pkc1
->nxt_offset
;
856 pkc1
->pkblk_end
= pkc1
->pkblk_start
+ pkc1
->kblk_size
;
858 prb_thaw_queue(pkc1
);
859 _prb_refresh_rx_retire_blk_timer(pkc1
);
865 * Queue freeze logic:
866 * 1) Assume tp_block_nr = 8 blocks.
867 * 2) At time 't0', user opens Rx ring.
868 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
869 * 4) user-space is either sleeping or processing block '0'.
870 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
871 * it will close block-7,loop around and try to fill block '0'.
873 * __packet_lookup_frame_in_block
874 * prb_retire_current_block()
875 * prb_dispatch_next_block()
876 * |->(BLOCK_STATUS == USER) evaluates to true
877 * 5.1) Since block-0 is currently in-use, we just freeze the queue.
878 * 6) Now there are two cases:
879 * 6.1) Link goes idle right after the queue is frozen.
880 * But remember, the last open_block() refreshed the timer.
881 * When this timer expires,it will refresh itself so that we can
882 * re-open block-0 in near future.
883 * 6.2) Link is busy and keeps on receiving packets. This is a simple
884 * case and __packet_lookup_frame_in_block will check if block-0
885 * is free and can now be re-used.
887 static void prb_freeze_queue(struct tpacket_kbdq_core
*pkc
,
888 struct packet_sock
*po
)
890 pkc
->reset_pending_on_curr_blk
= 1;
891 po
->stats
.stats3
.tp_freeze_q_cnt
++;
894 #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
897 * If the next block is free then we will dispatch it
898 * and return a good offset.
899 * Else, we will freeze the queue.
900 * So, caller must check the return value.
902 static void *prb_dispatch_next_block(struct tpacket_kbdq_core
*pkc
,
903 struct packet_sock
*po
)
905 struct tpacket_block_desc
*pbd
;
909 /* 1. Get current block num */
910 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
912 /* 2. If this block is currently in_use then freeze the queue */
913 if (TP_STATUS_USER
& BLOCK_STATUS(pbd
)) {
914 prb_freeze_queue(pkc
, po
);
920 * open this block and return the offset where the first packet
921 * needs to get stored.
923 prb_open_block(pkc
, pbd
);
924 return (void *)pkc
->nxt_offset
;
927 static void prb_retire_current_block(struct tpacket_kbdq_core
*pkc
,
928 struct packet_sock
*po
, unsigned int status
)
930 struct tpacket_block_desc
*pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
932 /* retire/close the current block */
933 if (likely(TP_STATUS_KERNEL
== BLOCK_STATUS(pbd
))) {
935 * Plug the case where copy_bits() is in progress on
936 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
937 * have space to copy the pkt in the current block and
938 * called prb_retire_current_block()
940 * We don't need to worry about the TMO case because
941 * the timer-handler already handled this case.
943 if (!(status
& TP_STATUS_BLK_TMO
)) {
944 while (atomic_read(&pkc
->blk_fill_in_prog
)) {
945 /* Waiting for skb_copy_bits to finish... */
949 prb_close_block(pkc
, pbd
, po
, status
);
954 static int prb_curr_blk_in_use(struct tpacket_kbdq_core
*pkc
,
955 struct tpacket_block_desc
*pbd
)
957 return TP_STATUS_USER
& BLOCK_STATUS(pbd
);
960 static int prb_queue_frozen(struct tpacket_kbdq_core
*pkc
)
962 return pkc
->reset_pending_on_curr_blk
;
965 static void prb_clear_blk_fill_status(struct packet_ring_buffer
*rb
)
967 struct tpacket_kbdq_core
*pkc
= GET_PBDQC_FROM_RB(rb
);
968 atomic_dec(&pkc
->blk_fill_in_prog
);
971 static void prb_fill_rxhash(struct tpacket_kbdq_core
*pkc
,
972 struct tpacket3_hdr
*ppd
)
974 ppd
->hv1
.tp_rxhash
= skb_get_hash(pkc
->skb
);
977 static void prb_clear_rxhash(struct tpacket_kbdq_core
*pkc
,
978 struct tpacket3_hdr
*ppd
)
980 ppd
->hv1
.tp_rxhash
= 0;
983 static void prb_fill_vlan_info(struct tpacket_kbdq_core
*pkc
,
984 struct tpacket3_hdr
*ppd
)
986 if (vlan_tx_tag_present(pkc
->skb
)) {
987 ppd
->hv1
.tp_vlan_tci
= vlan_tx_tag_get(pkc
->skb
);
988 ppd
->hv1
.tp_vlan_tpid
= ntohs(pkc
->skb
->vlan_proto
);
989 ppd
->tp_status
= TP_STATUS_VLAN_VALID
| TP_STATUS_VLAN_TPID_VALID
;
991 ppd
->hv1
.tp_vlan_tci
= 0;
992 ppd
->hv1
.tp_vlan_tpid
= 0;
993 ppd
->tp_status
= TP_STATUS_AVAILABLE
;
997 static void prb_run_all_ft_ops(struct tpacket_kbdq_core
*pkc
,
998 struct tpacket3_hdr
*ppd
)
1000 ppd
->hv1
.tp_padding
= 0;
1001 prb_fill_vlan_info(pkc
, ppd
);
1003 if (pkc
->feature_req_word
& TP_FT_REQ_FILL_RXHASH
)
1004 prb_fill_rxhash(pkc
, ppd
);
1006 prb_clear_rxhash(pkc
, ppd
);
1009 static void prb_fill_curr_block(char *curr
,
1010 struct tpacket_kbdq_core
*pkc
,
1011 struct tpacket_block_desc
*pbd
,
1014 struct tpacket3_hdr
*ppd
;
1016 ppd
= (struct tpacket3_hdr
*)curr
;
1017 ppd
->tp_next_offset
= TOTAL_PKT_LEN_INCL_ALIGN(len
);
1019 pkc
->nxt_offset
+= TOTAL_PKT_LEN_INCL_ALIGN(len
);
1020 BLOCK_LEN(pbd
) += TOTAL_PKT_LEN_INCL_ALIGN(len
);
1021 BLOCK_NUM_PKTS(pbd
) += 1;
1022 atomic_inc(&pkc
->blk_fill_in_prog
);
1023 prb_run_all_ft_ops(pkc
, ppd
);
1026 /* Assumes caller has the sk->rx_queue.lock */
1027 static void *__packet_lookup_frame_in_block(struct packet_sock
*po
,
1028 struct sk_buff
*skb
,
1033 struct tpacket_kbdq_core
*pkc
;
1034 struct tpacket_block_desc
*pbd
;
1037 pkc
= GET_PBDQC_FROM_RB(&po
->rx_ring
);
1038 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
1040 /* Queue is frozen when user space is lagging behind */
1041 if (prb_queue_frozen(pkc
)) {
1043 * Check if that last block which caused the queue to freeze,
1044 * is still in_use by user-space.
1046 if (prb_curr_blk_in_use(pkc
, pbd
)) {
1047 /* Can't record this packet */
1051 * Ok, the block was released by user-space.
1052 * Now let's open that block.
1053 * opening a block also thaws the queue.
1054 * Thawing is a side effect.
1056 prb_open_block(pkc
, pbd
);
1061 curr
= pkc
->nxt_offset
;
1063 end
= (char *)pbd
+ pkc
->kblk_size
;
1065 /* first try the current block */
1066 if (curr
+TOTAL_PKT_LEN_INCL_ALIGN(len
) < end
) {
1067 prb_fill_curr_block(curr
, pkc
, pbd
, len
);
1068 return (void *)curr
;
1071 /* Ok, close the current block */
1072 prb_retire_current_block(pkc
, po
, 0);
1074 /* Now, try to dispatch the next block */
1075 curr
= (char *)prb_dispatch_next_block(pkc
, po
);
1077 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
1078 prb_fill_curr_block(curr
, pkc
, pbd
, len
);
1079 return (void *)curr
;
1083 * No free blocks are available.user_space hasn't caught up yet.
1084 * Queue was just frozen and now this packet will get dropped.
1089 static void *packet_current_rx_frame(struct packet_sock
*po
,
1090 struct sk_buff
*skb
,
1091 int status
, unsigned int len
)
1094 switch (po
->tp_version
) {
1097 curr
= packet_lookup_frame(po
, &po
->rx_ring
,
1098 po
->rx_ring
.head
, status
);
1101 return __packet_lookup_frame_in_block(po
, skb
, status
, len
);
1103 WARN(1, "TPACKET version not supported\n");
1109 static void *prb_lookup_block(struct packet_sock
*po
,
1110 struct packet_ring_buffer
*rb
,
1114 struct tpacket_kbdq_core
*pkc
= GET_PBDQC_FROM_RB(rb
);
1115 struct tpacket_block_desc
*pbd
= GET_PBLOCK_DESC(pkc
, idx
);
1117 if (status
!= BLOCK_STATUS(pbd
))
1122 static int prb_previous_blk_num(struct packet_ring_buffer
*rb
)
1125 if (rb
->prb_bdqc
.kactive_blk_num
)
1126 prev
= rb
->prb_bdqc
.kactive_blk_num
-1;
1128 prev
= rb
->prb_bdqc
.knum_blocks
-1;
1132 /* Assumes caller has held the rx_queue.lock */
1133 static void *__prb_previous_block(struct packet_sock
*po
,
1134 struct packet_ring_buffer
*rb
,
1137 unsigned int previous
= prb_previous_blk_num(rb
);
1138 return prb_lookup_block(po
, rb
, previous
, status
);
1141 static void *packet_previous_rx_frame(struct packet_sock
*po
,
1142 struct packet_ring_buffer
*rb
,
1145 if (po
->tp_version
<= TPACKET_V2
)
1146 return packet_previous_frame(po
, rb
, status
);
1148 return __prb_previous_block(po
, rb
, status
);
1151 static void packet_increment_rx_head(struct packet_sock
*po
,
1152 struct packet_ring_buffer
*rb
)
1154 switch (po
->tp_version
) {
1157 return packet_increment_head(rb
);
1160 WARN(1, "TPACKET version not supported.\n");
1166 static void *packet_previous_frame(struct packet_sock
*po
,
1167 struct packet_ring_buffer
*rb
,
1170 unsigned int previous
= rb
->head
? rb
->head
- 1 : rb
->frame_max
;
1171 return packet_lookup_frame(po
, rb
, previous
, status
);
1174 static void packet_increment_head(struct packet_ring_buffer
*buff
)
1176 buff
->head
= buff
->head
!= buff
->frame_max
? buff
->head
+1 : 0;
1179 static void packet_inc_pending(struct packet_ring_buffer
*rb
)
1181 this_cpu_inc(*rb
->pending_refcnt
);
1184 static void packet_dec_pending(struct packet_ring_buffer
*rb
)
1186 this_cpu_dec(*rb
->pending_refcnt
);
1189 static unsigned int packet_read_pending(const struct packet_ring_buffer
*rb
)
1191 unsigned int refcnt
= 0;
1194 /* We don't use pending refcount in rx_ring. */
1195 if (rb
->pending_refcnt
== NULL
)
1198 for_each_possible_cpu(cpu
)
1199 refcnt
+= *per_cpu_ptr(rb
->pending_refcnt
, cpu
);
1204 static int packet_alloc_pending(struct packet_sock
*po
)
1206 po
->rx_ring
.pending_refcnt
= NULL
;
1208 po
->tx_ring
.pending_refcnt
= alloc_percpu(unsigned int);
1209 if (unlikely(po
->tx_ring
.pending_refcnt
== NULL
))
1215 static void packet_free_pending(struct packet_sock
*po
)
1217 free_percpu(po
->tx_ring
.pending_refcnt
);
1220 static bool packet_rcv_has_room(struct packet_sock
*po
, struct sk_buff
*skb
)
1222 struct sock
*sk
= &po
->sk
;
1225 if (po
->prot_hook
.func
!= tpacket_rcv
)
1226 return (atomic_read(&sk
->sk_rmem_alloc
) + skb
->truesize
)
1229 spin_lock(&sk
->sk_receive_queue
.lock
);
1230 if (po
->tp_version
== TPACKET_V3
)
1231 has_room
= prb_lookup_block(po
, &po
->rx_ring
,
1232 po
->rx_ring
.prb_bdqc
.kactive_blk_num
,
1235 has_room
= packet_lookup_frame(po
, &po
->rx_ring
,
1238 spin_unlock(&sk
->sk_receive_queue
.lock
);
1243 static void packet_sock_destruct(struct sock
*sk
)
1245 skb_queue_purge(&sk
->sk_error_queue
);
1247 WARN_ON(atomic_read(&sk
->sk_rmem_alloc
));
1248 WARN_ON(atomic_read(&sk
->sk_wmem_alloc
));
1250 if (!sock_flag(sk
, SOCK_DEAD
)) {
1251 pr_err("Attempt to release alive packet socket: %p\n", sk
);
1255 sk_refcnt_debug_dec(sk
);
1258 static int fanout_rr_next(struct packet_fanout
*f
, unsigned int num
)
1260 int x
= atomic_read(&f
->rr_cur
) + 1;
1268 static unsigned int fanout_demux_hash(struct packet_fanout
*f
,
1269 struct sk_buff
*skb
,
1272 return reciprocal_scale(skb_get_hash(skb
), num
);
1275 static unsigned int fanout_demux_lb(struct packet_fanout
*f
,
1276 struct sk_buff
*skb
,
1281 cur
= atomic_read(&f
->rr_cur
);
1282 while ((old
= atomic_cmpxchg(&f
->rr_cur
, cur
,
1283 fanout_rr_next(f
, num
))) != cur
)
1288 static unsigned int fanout_demux_cpu(struct packet_fanout
*f
,
1289 struct sk_buff
*skb
,
1292 return smp_processor_id() % num
;
1295 static unsigned int fanout_demux_rnd(struct packet_fanout
*f
,
1296 struct sk_buff
*skb
,
1299 return prandom_u32_max(num
);
1302 static unsigned int fanout_demux_rollover(struct packet_fanout
*f
,
1303 struct sk_buff
*skb
,
1304 unsigned int idx
, unsigned int skip
,
1309 i
= j
= min_t(int, f
->next
[idx
], num
- 1);
1311 if (i
!= skip
&& packet_rcv_has_room(pkt_sk(f
->arr
[i
]), skb
)) {
1323 static unsigned int fanout_demux_qm(struct packet_fanout
*f
,
1324 struct sk_buff
*skb
,
1327 return skb_get_queue_mapping(skb
) % num
;
1330 static bool fanout_has_flag(struct packet_fanout
*f
, u16 flag
)
1332 return f
->flags
& (flag
>> 8);
1335 static int packet_rcv_fanout(struct sk_buff
*skb
, struct net_device
*dev
,
1336 struct packet_type
*pt
, struct net_device
*orig_dev
)
1338 struct packet_fanout
*f
= pt
->af_packet_priv
;
1339 unsigned int num
= f
->num_members
;
1340 struct packet_sock
*po
;
1343 if (!net_eq(dev_net(dev
), read_pnet(&f
->net
)) ||
1350 case PACKET_FANOUT_HASH
:
1352 if (fanout_has_flag(f
, PACKET_FANOUT_FLAG_DEFRAG
)) {
1353 skb
= ip_check_defrag(skb
, IP_DEFRAG_AF_PACKET
);
1357 idx
= fanout_demux_hash(f
, skb
, num
);
1359 case PACKET_FANOUT_LB
:
1360 idx
= fanout_demux_lb(f
, skb
, num
);
1362 case PACKET_FANOUT_CPU
:
1363 idx
= fanout_demux_cpu(f
, skb
, num
);
1365 case PACKET_FANOUT_RND
:
1366 idx
= fanout_demux_rnd(f
, skb
, num
);
1368 case PACKET_FANOUT_QM
:
1369 idx
= fanout_demux_qm(f
, skb
, num
);
1371 case PACKET_FANOUT_ROLLOVER
:
1372 idx
= fanout_demux_rollover(f
, skb
, 0, (unsigned int) -1, num
);
1376 po
= pkt_sk(f
->arr
[idx
]);
1377 if (fanout_has_flag(f
, PACKET_FANOUT_FLAG_ROLLOVER
) &&
1378 unlikely(!packet_rcv_has_room(po
, skb
))) {
1379 idx
= fanout_demux_rollover(f
, skb
, idx
, idx
, num
);
1380 po
= pkt_sk(f
->arr
[idx
]);
1383 return po
->prot_hook
.func(skb
, dev
, &po
->prot_hook
, orig_dev
);
1386 DEFINE_MUTEX(fanout_mutex
);
1387 EXPORT_SYMBOL_GPL(fanout_mutex
);
1388 static LIST_HEAD(fanout_list
);
1390 static void __fanout_link(struct sock
*sk
, struct packet_sock
*po
)
1392 struct packet_fanout
*f
= po
->fanout
;
1394 spin_lock(&f
->lock
);
1395 f
->arr
[f
->num_members
] = sk
;
1398 spin_unlock(&f
->lock
);
1401 static void __fanout_unlink(struct sock
*sk
, struct packet_sock
*po
)
1403 struct packet_fanout
*f
= po
->fanout
;
1406 spin_lock(&f
->lock
);
1407 for (i
= 0; i
< f
->num_members
; i
++) {
1408 if (f
->arr
[i
] == sk
)
1411 BUG_ON(i
>= f
->num_members
);
1412 f
->arr
[i
] = f
->arr
[f
->num_members
- 1];
1414 spin_unlock(&f
->lock
);
1417 static bool match_fanout_group(struct packet_type
*ptype
, struct sock
*sk
)
1419 if (ptype
->af_packet_priv
== (void *)((struct packet_sock
*)sk
)->fanout
)
1425 static int fanout_add(struct sock
*sk
, u16 id
, u16 type_flags
)
1427 struct packet_sock
*po
= pkt_sk(sk
);
1428 struct packet_fanout
*f
, *match
;
1429 u8 type
= type_flags
& 0xff;
1430 u8 flags
= type_flags
>> 8;
1434 case PACKET_FANOUT_ROLLOVER
:
1435 if (type_flags
& PACKET_FANOUT_FLAG_ROLLOVER
)
1437 case PACKET_FANOUT_HASH
:
1438 case PACKET_FANOUT_LB
:
1439 case PACKET_FANOUT_CPU
:
1440 case PACKET_FANOUT_RND
:
1441 case PACKET_FANOUT_QM
:
1453 mutex_lock(&fanout_mutex
);
1455 list_for_each_entry(f
, &fanout_list
, list
) {
1457 read_pnet(&f
->net
) == sock_net(sk
)) {
1463 if (match
&& match
->flags
!= flags
)
1467 match
= kzalloc(sizeof(*match
), GFP_KERNEL
);
1470 write_pnet(&match
->net
, sock_net(sk
));
1473 match
->flags
= flags
;
1474 atomic_set(&match
->rr_cur
, 0);
1475 INIT_LIST_HEAD(&match
->list
);
1476 spin_lock_init(&match
->lock
);
1477 atomic_set(&match
->sk_ref
, 0);
1478 match
->prot_hook
.type
= po
->prot_hook
.type
;
1479 match
->prot_hook
.dev
= po
->prot_hook
.dev
;
1480 match
->prot_hook
.func
= packet_rcv_fanout
;
1481 match
->prot_hook
.af_packet_priv
= match
;
1482 match
->prot_hook
.id_match
= match_fanout_group
;
1483 dev_add_pack(&match
->prot_hook
);
1484 list_add(&match
->list
, &fanout_list
);
1487 if (match
->type
== type
&&
1488 match
->prot_hook
.type
== po
->prot_hook
.type
&&
1489 match
->prot_hook
.dev
== po
->prot_hook
.dev
) {
1491 if (atomic_read(&match
->sk_ref
) < PACKET_FANOUT_MAX
) {
1492 __dev_remove_pack(&po
->prot_hook
);
1494 atomic_inc(&match
->sk_ref
);
1495 __fanout_link(sk
, po
);
1500 mutex_unlock(&fanout_mutex
);
1504 static void fanout_release(struct sock
*sk
)
1506 struct packet_sock
*po
= pkt_sk(sk
);
1507 struct packet_fanout
*f
;
1513 mutex_lock(&fanout_mutex
);
1516 if (atomic_dec_and_test(&f
->sk_ref
)) {
1518 dev_remove_pack(&f
->prot_hook
);
1521 mutex_unlock(&fanout_mutex
);
1524 static const struct proto_ops packet_ops
;
1526 static const struct proto_ops packet_ops_spkt
;
1528 static int packet_rcv_spkt(struct sk_buff
*skb
, struct net_device
*dev
,
1529 struct packet_type
*pt
, struct net_device
*orig_dev
)
1532 struct sockaddr_pkt
*spkt
;
1535 * When we registered the protocol we saved the socket in the data
1536 * field for just this event.
1539 sk
= pt
->af_packet_priv
;
1542 * Yank back the headers [hope the device set this
1543 * right or kerboom...]
1545 * Incoming packets have ll header pulled,
1548 * For outgoing ones skb->data == skb_mac_header(skb)
1549 * so that this procedure is noop.
1552 if (skb
->pkt_type
== PACKET_LOOPBACK
)
1555 if (!net_eq(dev_net(dev
), sock_net(sk
)))
1558 skb
= skb_share_check(skb
, GFP_ATOMIC
);
1562 /* drop any routing info */
1565 /* drop conntrack reference */
1568 spkt
= &PACKET_SKB_CB(skb
)->sa
.pkt
;
1570 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
1573 * The SOCK_PACKET socket receives _all_ frames.
1576 spkt
->spkt_family
= dev
->type
;
1577 strlcpy(spkt
->spkt_device
, dev
->name
, sizeof(spkt
->spkt_device
));
1578 spkt
->spkt_protocol
= skb
->protocol
;
1581 * Charge the memory to the socket. This is done specifically
1582 * to prevent sockets using all the memory up.
1585 if (sock_queue_rcv_skb(sk
, skb
) == 0)
1596 * Output a raw packet to a device layer. This bypasses all the other
1597 * protocol layers and you must therefore supply it with a complete frame
1600 static int packet_sendmsg_spkt(struct kiocb
*iocb
, struct socket
*sock
,
1601 struct msghdr
*msg
, size_t len
)
1603 struct sock
*sk
= sock
->sk
;
1604 DECLARE_SOCKADDR(struct sockaddr_pkt
*, saddr
, msg
->msg_name
);
1605 struct sk_buff
*skb
= NULL
;
1606 struct net_device
*dev
;
1612 * Get and verify the address.
1616 if (msg
->msg_namelen
< sizeof(struct sockaddr
))
1618 if (msg
->msg_namelen
== sizeof(struct sockaddr_pkt
))
1619 proto
= saddr
->spkt_protocol
;
1621 return -ENOTCONN
; /* SOCK_PACKET must be sent giving an address */
1624 * Find the device first to size check it
1627 saddr
->spkt_device
[sizeof(saddr
->spkt_device
) - 1] = 0;
1630 dev
= dev_get_by_name_rcu(sock_net(sk
), saddr
->spkt_device
);
1636 if (!(dev
->flags
& IFF_UP
))
1640 * You may not queue a frame bigger than the mtu. This is the lowest level
1641 * raw protocol and you must do your own fragmentation at this level.
1644 if (unlikely(sock_flag(sk
, SOCK_NOFCS
))) {
1645 if (!netif_supports_nofcs(dev
)) {
1646 err
= -EPROTONOSUPPORT
;
1649 extra_len
= 4; /* We're doing our own CRC */
1653 if (len
> dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
+ extra_len
)
1657 size_t reserved
= LL_RESERVED_SPACE(dev
);
1658 int tlen
= dev
->needed_tailroom
;
1659 unsigned int hhlen
= dev
->header_ops
? dev
->hard_header_len
: 0;
1662 skb
= sock_wmalloc(sk
, len
+ reserved
+ tlen
, 0, GFP_KERNEL
);
1665 /* FIXME: Save some space for broken drivers that write a hard
1666 * header at transmission time by themselves. PPP is the notable
1667 * one here. This should really be fixed at the driver level.
1669 skb_reserve(skb
, reserved
);
1670 skb_reset_network_header(skb
);
1672 /* Try to align data part correctly */
1677 skb_reset_network_header(skb
);
1679 err
= memcpy_from_msg(skb_put(skb
, len
), msg
, len
);
1685 if (len
> (dev
->mtu
+ dev
->hard_header_len
+ extra_len
)) {
1686 /* Earlier code assumed this would be a VLAN pkt,
1687 * double-check this now that we have the actual
1690 struct ethhdr
*ehdr
;
1691 skb_reset_mac_header(skb
);
1692 ehdr
= eth_hdr(skb
);
1693 if (ehdr
->h_proto
!= htons(ETH_P_8021Q
)) {
1699 skb
->protocol
= proto
;
1701 skb
->priority
= sk
->sk_priority
;
1702 skb
->mark
= sk
->sk_mark
;
1704 sock_tx_timestamp(sk
, &skb_shinfo(skb
)->tx_flags
);
1706 if (unlikely(extra_len
== 4))
1709 skb_probe_transport_header(skb
, 0);
1711 dev_queue_xmit(skb
);
1722 static unsigned int run_filter(const struct sk_buff
*skb
,
1723 const struct sock
*sk
,
1726 struct sk_filter
*filter
;
1729 filter
= rcu_dereference(sk
->sk_filter
);
1731 res
= SK_RUN_FILTER(filter
, skb
);
1738 * This function makes lazy skb cloning in hope that most of packets
1739 * are discarded by BPF.
1741 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
1742 * and skb->cb are mangled. It works because (and until) packets
1743 * falling here are owned by current CPU. Output packets are cloned
1744 * by dev_queue_xmit_nit(), input packets are processed by net_bh
1745 * sequencially, so that if we return skb to original state on exit,
1746 * we will not harm anyone.
1749 static int packet_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
1750 struct packet_type
*pt
, struct net_device
*orig_dev
)
1753 struct sockaddr_ll
*sll
;
1754 struct packet_sock
*po
;
1755 u8
*skb_head
= skb
->data
;
1756 int skb_len
= skb
->len
;
1757 unsigned int snaplen
, res
;
1759 if (skb
->pkt_type
== PACKET_LOOPBACK
)
1762 sk
= pt
->af_packet_priv
;
1765 if (!net_eq(dev_net(dev
), sock_net(sk
)))
1770 if (dev
->header_ops
) {
1771 /* The device has an explicit notion of ll header,
1772 * exported to higher levels.
1774 * Otherwise, the device hides details of its frame
1775 * structure, so that corresponding packet head is
1776 * never delivered to user.
1778 if (sk
->sk_type
!= SOCK_DGRAM
)
1779 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
1780 else if (skb
->pkt_type
== PACKET_OUTGOING
) {
1781 /* Special case: outgoing packets have ll header at head */
1782 skb_pull(skb
, skb_network_offset(skb
));
1788 res
= run_filter(skb
, sk
, snaplen
);
1790 goto drop_n_restore
;
1794 if (atomic_read(&sk
->sk_rmem_alloc
) >= sk
->sk_rcvbuf
)
1797 if (skb_shared(skb
)) {
1798 struct sk_buff
*nskb
= skb_clone(skb
, GFP_ATOMIC
);
1802 if (skb_head
!= skb
->data
) {
1803 skb
->data
= skb_head
;
1810 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb
)) + MAX_ADDR_LEN
- 8 >
1813 sll
= &PACKET_SKB_CB(skb
)->sa
.ll
;
1814 sll
->sll_family
= AF_PACKET
;
1815 sll
->sll_hatype
= dev
->type
;
1816 sll
->sll_protocol
= skb
->protocol
;
1817 sll
->sll_pkttype
= skb
->pkt_type
;
1818 if (unlikely(po
->origdev
))
1819 sll
->sll_ifindex
= orig_dev
->ifindex
;
1821 sll
->sll_ifindex
= dev
->ifindex
;
1823 sll
->sll_halen
= dev_parse_header(skb
, sll
->sll_addr
);
1825 PACKET_SKB_CB(skb
)->origlen
= skb
->len
;
1827 if (pskb_trim(skb
, snaplen
))
1830 skb_set_owner_r(skb
, sk
);
1834 /* drop conntrack reference */
1837 spin_lock(&sk
->sk_receive_queue
.lock
);
1838 po
->stats
.stats1
.tp_packets
++;
1839 skb
->dropcount
= atomic_read(&sk
->sk_drops
);
1840 __skb_queue_tail(&sk
->sk_receive_queue
, skb
);
1841 spin_unlock(&sk
->sk_receive_queue
.lock
);
1842 sk
->sk_data_ready(sk
);
1846 spin_lock(&sk
->sk_receive_queue
.lock
);
1847 po
->stats
.stats1
.tp_drops
++;
1848 atomic_inc(&sk
->sk_drops
);
1849 spin_unlock(&sk
->sk_receive_queue
.lock
);
1852 if (skb_head
!= skb
->data
&& skb_shared(skb
)) {
1853 skb
->data
= skb_head
;
1861 static int tpacket_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
1862 struct packet_type
*pt
, struct net_device
*orig_dev
)
1865 struct packet_sock
*po
;
1866 struct sockaddr_ll
*sll
;
1867 union tpacket_uhdr h
;
1868 u8
*skb_head
= skb
->data
;
1869 int skb_len
= skb
->len
;
1870 unsigned int snaplen
, res
;
1871 unsigned long status
= TP_STATUS_USER
;
1872 unsigned short macoff
, netoff
, hdrlen
;
1873 struct sk_buff
*copy_skb
= NULL
;
1877 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
1878 * We may add members to them until current aligned size without forcing
1879 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
1881 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h
.h2
)) != 32);
1882 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h
.h3
)) != 48);
1884 if (skb
->pkt_type
== PACKET_LOOPBACK
)
1887 sk
= pt
->af_packet_priv
;
1890 if (!net_eq(dev_net(dev
), sock_net(sk
)))
1893 if (dev
->header_ops
) {
1894 if (sk
->sk_type
!= SOCK_DGRAM
)
1895 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
1896 else if (skb
->pkt_type
== PACKET_OUTGOING
) {
1897 /* Special case: outgoing packets have ll header at head */
1898 skb_pull(skb
, skb_network_offset(skb
));
1902 if (skb
->ip_summed
== CHECKSUM_PARTIAL
)
1903 status
|= TP_STATUS_CSUMNOTREADY
;
1907 res
= run_filter(skb
, sk
, snaplen
);
1909 goto drop_n_restore
;
1913 if (sk
->sk_type
== SOCK_DGRAM
) {
1914 macoff
= netoff
= TPACKET_ALIGN(po
->tp_hdrlen
) + 16 +
1917 unsigned int maclen
= skb_network_offset(skb
);
1918 netoff
= TPACKET_ALIGN(po
->tp_hdrlen
+
1919 (maclen
< 16 ? 16 : maclen
)) +
1921 macoff
= netoff
- maclen
;
1923 if (po
->tp_version
<= TPACKET_V2
) {
1924 if (macoff
+ snaplen
> po
->rx_ring
.frame_size
) {
1925 if (po
->copy_thresh
&&
1926 atomic_read(&sk
->sk_rmem_alloc
) < sk
->sk_rcvbuf
) {
1927 if (skb_shared(skb
)) {
1928 copy_skb
= skb_clone(skb
, GFP_ATOMIC
);
1930 copy_skb
= skb_get(skb
);
1931 skb_head
= skb
->data
;
1934 skb_set_owner_r(copy_skb
, sk
);
1936 snaplen
= po
->rx_ring
.frame_size
- macoff
;
1937 if ((int)snaplen
< 0)
1940 } else if (unlikely(macoff
+ snaplen
>
1941 GET_PBDQC_FROM_RB(&po
->rx_ring
)->max_frame_len
)) {
1944 nval
= GET_PBDQC_FROM_RB(&po
->rx_ring
)->max_frame_len
- macoff
;
1945 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
1946 snaplen
, nval
, macoff
);
1948 if (unlikely((int)snaplen
< 0)) {
1950 macoff
= GET_PBDQC_FROM_RB(&po
->rx_ring
)->max_frame_len
;
1953 spin_lock(&sk
->sk_receive_queue
.lock
);
1954 h
.raw
= packet_current_rx_frame(po
, skb
,
1955 TP_STATUS_KERNEL
, (macoff
+snaplen
));
1958 if (po
->tp_version
<= TPACKET_V2
) {
1959 packet_increment_rx_head(po
, &po
->rx_ring
);
1961 * LOSING will be reported till you read the stats,
1962 * because it's COR - Clear On Read.
1963 * Anyways, moving it for V1/V2 only as V3 doesn't need this
1966 if (po
->stats
.stats1
.tp_drops
)
1967 status
|= TP_STATUS_LOSING
;
1969 po
->stats
.stats1
.tp_packets
++;
1971 status
|= TP_STATUS_COPY
;
1972 __skb_queue_tail(&sk
->sk_receive_queue
, copy_skb
);
1974 spin_unlock(&sk
->sk_receive_queue
.lock
);
1976 skb_copy_bits(skb
, 0, h
.raw
+ macoff
, snaplen
);
1978 if (!(ts_status
= tpacket_get_timestamp(skb
, &ts
, po
->tp_tstamp
)))
1979 getnstimeofday(&ts
);
1981 status
|= ts_status
;
1983 switch (po
->tp_version
) {
1985 h
.h1
->tp_len
= skb
->len
;
1986 h
.h1
->tp_snaplen
= snaplen
;
1987 h
.h1
->tp_mac
= macoff
;
1988 h
.h1
->tp_net
= netoff
;
1989 h
.h1
->tp_sec
= ts
.tv_sec
;
1990 h
.h1
->tp_usec
= ts
.tv_nsec
/ NSEC_PER_USEC
;
1991 hdrlen
= sizeof(*h
.h1
);
1994 h
.h2
->tp_len
= skb
->len
;
1995 h
.h2
->tp_snaplen
= snaplen
;
1996 h
.h2
->tp_mac
= macoff
;
1997 h
.h2
->tp_net
= netoff
;
1998 h
.h2
->tp_sec
= ts
.tv_sec
;
1999 h
.h2
->tp_nsec
= ts
.tv_nsec
;
2000 if (vlan_tx_tag_present(skb
)) {
2001 h
.h2
->tp_vlan_tci
= vlan_tx_tag_get(skb
);
2002 h
.h2
->tp_vlan_tpid
= ntohs(skb
->vlan_proto
);
2003 status
|= TP_STATUS_VLAN_VALID
| TP_STATUS_VLAN_TPID_VALID
;
2005 h
.h2
->tp_vlan_tci
= 0;
2006 h
.h2
->tp_vlan_tpid
= 0;
2008 memset(h
.h2
->tp_padding
, 0, sizeof(h
.h2
->tp_padding
));
2009 hdrlen
= sizeof(*h
.h2
);
2012 /* tp_nxt_offset,vlan are already populated above.
2013 * So DONT clear those fields here
2015 h
.h3
->tp_status
|= status
;
2016 h
.h3
->tp_len
= skb
->len
;
2017 h
.h3
->tp_snaplen
= snaplen
;
2018 h
.h3
->tp_mac
= macoff
;
2019 h
.h3
->tp_net
= netoff
;
2020 h
.h3
->tp_sec
= ts
.tv_sec
;
2021 h
.h3
->tp_nsec
= ts
.tv_nsec
;
2022 memset(h
.h3
->tp_padding
, 0, sizeof(h
.h3
->tp_padding
));
2023 hdrlen
= sizeof(*h
.h3
);
2029 sll
= h
.raw
+ TPACKET_ALIGN(hdrlen
);
2030 sll
->sll_halen
= dev_parse_header(skb
, sll
->sll_addr
);
2031 sll
->sll_family
= AF_PACKET
;
2032 sll
->sll_hatype
= dev
->type
;
2033 sll
->sll_protocol
= skb
->protocol
;
2034 sll
->sll_pkttype
= skb
->pkt_type
;
2035 if (unlikely(po
->origdev
))
2036 sll
->sll_ifindex
= orig_dev
->ifindex
;
2038 sll
->sll_ifindex
= dev
->ifindex
;
2042 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
2043 if (po
->tp_version
<= TPACKET_V2
) {
2046 end
= (u8
*) PAGE_ALIGN((unsigned long) h
.raw
+
2049 for (start
= h
.raw
; start
< end
; start
+= PAGE_SIZE
)
2050 flush_dcache_page(pgv_to_page(start
));
2055 if (po
->tp_version
<= TPACKET_V2
)
2056 __packet_set_status(po
, h
.raw
, status
);
2058 prb_clear_blk_fill_status(&po
->rx_ring
);
2060 sk
->sk_data_ready(sk
);
2063 if (skb_head
!= skb
->data
&& skb_shared(skb
)) {
2064 skb
->data
= skb_head
;
2072 po
->stats
.stats1
.tp_drops
++;
2073 spin_unlock(&sk
->sk_receive_queue
.lock
);
2075 sk
->sk_data_ready(sk
);
2076 kfree_skb(copy_skb
);
2077 goto drop_n_restore
;
2080 static void tpacket_destruct_skb(struct sk_buff
*skb
)
2082 struct packet_sock
*po
= pkt_sk(skb
->sk
);
2084 if (likely(po
->tx_ring
.pg_vec
)) {
2088 ph
= skb_shinfo(skb
)->destructor_arg
;
2089 packet_dec_pending(&po
->tx_ring
);
2091 ts
= __packet_set_timestamp(po
, ph
, skb
);
2092 __packet_set_status(po
, ph
, TP_STATUS_AVAILABLE
| ts
);
2098 static bool ll_header_truncated(const struct net_device
*dev
, int len
)
2100 /* net device doesn't like empty head */
2101 if (unlikely(len
<= dev
->hard_header_len
)) {
2102 net_warn_ratelimited("%s: packet size is too short (%d < %d)\n",
2103 current
->comm
, len
, dev
->hard_header_len
);
2110 static int tpacket_fill_skb(struct packet_sock
*po
, struct sk_buff
*skb
,
2111 void *frame
, struct net_device
*dev
, int size_max
,
2112 __be16 proto
, unsigned char *addr
, int hlen
)
2114 union tpacket_uhdr ph
;
2115 int to_write
, offset
, len
, tp_len
, nr_frags
, len_max
;
2116 struct socket
*sock
= po
->sk
.sk_socket
;
2123 skb
->protocol
= proto
;
2125 skb
->priority
= po
->sk
.sk_priority
;
2126 skb
->mark
= po
->sk
.sk_mark
;
2127 sock_tx_timestamp(&po
->sk
, &skb_shinfo(skb
)->tx_flags
);
2128 skb_shinfo(skb
)->destructor_arg
= ph
.raw
;
2130 switch (po
->tp_version
) {
2132 tp_len
= ph
.h2
->tp_len
;
2135 tp_len
= ph
.h1
->tp_len
;
2138 if (unlikely(tp_len
> size_max
)) {
2139 pr_err("packet size is too long (%d > %d)\n", tp_len
, size_max
);
2143 skb_reserve(skb
, hlen
);
2144 skb_reset_network_header(skb
);
2146 if (!packet_use_direct_xmit(po
))
2147 skb_probe_transport_header(skb
, 0);
2148 if (unlikely(po
->tp_tx_has_off
)) {
2149 int off_min
, off_max
, off
;
2150 off_min
= po
->tp_hdrlen
- sizeof(struct sockaddr_ll
);
2151 off_max
= po
->tx_ring
.frame_size
- tp_len
;
2152 if (sock
->type
== SOCK_DGRAM
) {
2153 switch (po
->tp_version
) {
2155 off
= ph
.h2
->tp_net
;
2158 off
= ph
.h1
->tp_net
;
2162 switch (po
->tp_version
) {
2164 off
= ph
.h2
->tp_mac
;
2167 off
= ph
.h1
->tp_mac
;
2171 if (unlikely((off
< off_min
) || (off_max
< off
)))
2173 data
= ph
.raw
+ off
;
2175 data
= ph
.raw
+ po
->tp_hdrlen
- sizeof(struct sockaddr_ll
);
2179 if (sock
->type
== SOCK_DGRAM
) {
2180 err
= dev_hard_header(skb
, dev
, ntohs(proto
), addr
,
2182 if (unlikely(err
< 0))
2184 } else if (dev
->hard_header_len
) {
2185 if (ll_header_truncated(dev
, tp_len
))
2188 skb_push(skb
, dev
->hard_header_len
);
2189 err
= skb_store_bits(skb
, 0, data
,
2190 dev
->hard_header_len
);
2194 data
+= dev
->hard_header_len
;
2195 to_write
-= dev
->hard_header_len
;
2198 offset
= offset_in_page(data
);
2199 len_max
= PAGE_SIZE
- offset
;
2200 len
= ((to_write
> len_max
) ? len_max
: to_write
);
2202 skb
->data_len
= to_write
;
2203 skb
->len
+= to_write
;
2204 skb
->truesize
+= to_write
;
2205 atomic_add(to_write
, &po
->sk
.sk_wmem_alloc
);
2207 while (likely(to_write
)) {
2208 nr_frags
= skb_shinfo(skb
)->nr_frags
;
2210 if (unlikely(nr_frags
>= MAX_SKB_FRAGS
)) {
2211 pr_err("Packet exceed the number of skb frags(%lu)\n",
2216 page
= pgv_to_page(data
);
2218 flush_dcache_page(page
);
2220 skb_fill_page_desc(skb
, nr_frags
, page
, offset
, len
);
2223 len_max
= PAGE_SIZE
;
2224 len
= ((to_write
> len_max
) ? len_max
: to_write
);
2230 static int tpacket_snd(struct packet_sock
*po
, struct msghdr
*msg
)
2232 struct sk_buff
*skb
;
2233 struct net_device
*dev
;
2235 int err
, reserve
= 0;
2237 DECLARE_SOCKADDR(struct sockaddr_ll
*, saddr
, msg
->msg_name
);
2238 bool need_wait
= !(msg
->msg_flags
& MSG_DONTWAIT
);
2239 int tp_len
, size_max
;
2240 unsigned char *addr
;
2242 int status
= TP_STATUS_AVAILABLE
;
2245 mutex_lock(&po
->pg_vec_lock
);
2247 if (likely(saddr
== NULL
)) {
2248 dev
= packet_cached_dev_get(po
);
2253 if (msg
->msg_namelen
< sizeof(struct sockaddr_ll
))
2255 if (msg
->msg_namelen
< (saddr
->sll_halen
2256 + offsetof(struct sockaddr_ll
,
2259 proto
= saddr
->sll_protocol
;
2260 addr
= saddr
->sll_addr
;
2261 dev
= dev_get_by_index(sock_net(&po
->sk
), saddr
->sll_ifindex
);
2265 if (unlikely(dev
== NULL
))
2268 if (unlikely(!(dev
->flags
& IFF_UP
)))
2271 reserve
= dev
->hard_header_len
+ VLAN_HLEN
;
2272 size_max
= po
->tx_ring
.frame_size
2273 - (po
->tp_hdrlen
- sizeof(struct sockaddr_ll
));
2275 if (size_max
> dev
->mtu
+ reserve
)
2276 size_max
= dev
->mtu
+ reserve
;
2279 ph
= packet_current_frame(po
, &po
->tx_ring
,
2280 TP_STATUS_SEND_REQUEST
);
2281 if (unlikely(ph
== NULL
)) {
2282 if (need_wait
&& need_resched())
2287 status
= TP_STATUS_SEND_REQUEST
;
2288 hlen
= LL_RESERVED_SPACE(dev
);
2289 tlen
= dev
->needed_tailroom
;
2290 skb
= sock_alloc_send_skb(&po
->sk
,
2291 hlen
+ tlen
+ sizeof(struct sockaddr_ll
),
2294 if (unlikely(skb
== NULL
))
2297 tp_len
= tpacket_fill_skb(po
, skb
, ph
, dev
, size_max
, proto
,
2299 if (tp_len
> dev
->mtu
+ dev
->hard_header_len
) {
2300 struct ethhdr
*ehdr
;
2301 /* Earlier code assumed this would be a VLAN pkt,
2302 * double-check this now that we have the actual
2306 skb_reset_mac_header(skb
);
2307 ehdr
= eth_hdr(skb
);
2308 if (ehdr
->h_proto
!= htons(ETH_P_8021Q
))
2311 if (unlikely(tp_len
< 0)) {
2313 __packet_set_status(po
, ph
,
2314 TP_STATUS_AVAILABLE
);
2315 packet_increment_head(&po
->tx_ring
);
2319 status
= TP_STATUS_WRONG_FORMAT
;
2325 packet_pick_tx_queue(dev
, skb
);
2327 skb
->destructor
= tpacket_destruct_skb
;
2328 __packet_set_status(po
, ph
, TP_STATUS_SENDING
);
2329 packet_inc_pending(&po
->tx_ring
);
2331 status
= TP_STATUS_SEND_REQUEST
;
2332 err
= po
->xmit(skb
);
2333 if (unlikely(err
> 0)) {
2334 err
= net_xmit_errno(err
);
2335 if (err
&& __packet_get_status(po
, ph
) ==
2336 TP_STATUS_AVAILABLE
) {
2337 /* skb was destructed already */
2342 * skb was dropped but not destructed yet;
2343 * let's treat it like congestion or err < 0
2347 packet_increment_head(&po
->tx_ring
);
2349 } while (likely((ph
!= NULL
) ||
2350 /* Note: packet_read_pending() might be slow if we have
2351 * to call it as it's per_cpu variable, but in fast-path
2352 * we already short-circuit the loop with the first
2353 * condition, and luckily don't have to go that path
2356 (need_wait
&& packet_read_pending(&po
->tx_ring
))));
2362 __packet_set_status(po
, ph
, status
);
2367 mutex_unlock(&po
->pg_vec_lock
);
2371 static struct sk_buff
*packet_alloc_skb(struct sock
*sk
, size_t prepad
,
2372 size_t reserve
, size_t len
,
2373 size_t linear
, int noblock
,
2376 struct sk_buff
*skb
;
2378 /* Under a page? Don't bother with paged skb. */
2379 if (prepad
+ len
< PAGE_SIZE
|| !linear
)
2382 skb
= sock_alloc_send_pskb(sk
, prepad
+ linear
, len
- linear
, noblock
,
2387 skb_reserve(skb
, reserve
);
2388 skb_put(skb
, linear
);
2389 skb
->data_len
= len
- linear
;
2390 skb
->len
+= len
- linear
;
2395 static int packet_snd(struct socket
*sock
, struct msghdr
*msg
, size_t len
)
2397 struct sock
*sk
= sock
->sk
;
2398 DECLARE_SOCKADDR(struct sockaddr_ll
*, saddr
, msg
->msg_name
);
2399 struct sk_buff
*skb
;
2400 struct net_device
*dev
;
2402 unsigned char *addr
;
2403 int err
, reserve
= 0;
2404 struct virtio_net_hdr vnet_hdr
= { 0 };
2407 struct packet_sock
*po
= pkt_sk(sk
);
2408 unsigned short gso_type
= 0;
2414 * Get and verify the address.
2417 if (likely(saddr
== NULL
)) {
2418 dev
= packet_cached_dev_get(po
);
2423 if (msg
->msg_namelen
< sizeof(struct sockaddr_ll
))
2425 if (msg
->msg_namelen
< (saddr
->sll_halen
+ offsetof(struct sockaddr_ll
, sll_addr
)))
2427 proto
= saddr
->sll_protocol
;
2428 addr
= saddr
->sll_addr
;
2429 dev
= dev_get_by_index(sock_net(sk
), saddr
->sll_ifindex
);
2433 if (unlikely(dev
== NULL
))
2436 if (unlikely(!(dev
->flags
& IFF_UP
)))
2439 if (sock
->type
== SOCK_RAW
)
2440 reserve
= dev
->hard_header_len
;
2441 if (po
->has_vnet_hdr
) {
2442 vnet_hdr_len
= sizeof(vnet_hdr
);
2445 if (len
< vnet_hdr_len
)
2448 len
-= vnet_hdr_len
;
2451 n
= copy_from_iter(&vnet_hdr
, vnet_hdr_len
, &msg
->msg_iter
);
2452 if (n
!= vnet_hdr_len
)
2455 if ((vnet_hdr
.flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) &&
2456 (vnet_hdr
.csum_start
+ vnet_hdr
.csum_offset
+ 2 >
2458 vnet_hdr
.hdr_len
= vnet_hdr
.csum_start
+
2459 vnet_hdr
.csum_offset
+ 2;
2462 if (vnet_hdr
.hdr_len
> len
)
2465 if (vnet_hdr
.gso_type
!= VIRTIO_NET_HDR_GSO_NONE
) {
2466 switch (vnet_hdr
.gso_type
& ~VIRTIO_NET_HDR_GSO_ECN
) {
2467 case VIRTIO_NET_HDR_GSO_TCPV4
:
2468 gso_type
= SKB_GSO_TCPV4
;
2470 case VIRTIO_NET_HDR_GSO_TCPV6
:
2471 gso_type
= SKB_GSO_TCPV6
;
2473 case VIRTIO_NET_HDR_GSO_UDP
:
2474 gso_type
= SKB_GSO_UDP
;
2480 if (vnet_hdr
.gso_type
& VIRTIO_NET_HDR_GSO_ECN
)
2481 gso_type
|= SKB_GSO_TCP_ECN
;
2483 if (vnet_hdr
.gso_size
== 0)
2489 if (unlikely(sock_flag(sk
, SOCK_NOFCS
))) {
2490 if (!netif_supports_nofcs(dev
)) {
2491 err
= -EPROTONOSUPPORT
;
2494 extra_len
= 4; /* We're doing our own CRC */
2498 if (!gso_type
&& (len
> dev
->mtu
+ reserve
+ VLAN_HLEN
+ extra_len
))
2502 hlen
= LL_RESERVED_SPACE(dev
);
2503 tlen
= dev
->needed_tailroom
;
2504 skb
= packet_alloc_skb(sk
, hlen
+ tlen
, hlen
, len
, vnet_hdr
.hdr_len
,
2505 msg
->msg_flags
& MSG_DONTWAIT
, &err
);
2509 skb_set_network_header(skb
, reserve
);
2512 if (sock
->type
== SOCK_DGRAM
) {
2513 offset
= dev_hard_header(skb
, dev
, ntohs(proto
), addr
, NULL
, len
);
2514 if (unlikely(offset
) < 0)
2517 if (ll_header_truncated(dev
, len
))
2521 /* Returns -EFAULT on error */
2522 err
= skb_copy_datagram_from_iter(skb
, offset
, &msg
->msg_iter
, len
);
2526 sock_tx_timestamp(sk
, &skb_shinfo(skb
)->tx_flags
);
2528 if (!gso_type
&& (len
> dev
->mtu
+ reserve
+ extra_len
)) {
2529 /* Earlier code assumed this would be a VLAN pkt,
2530 * double-check this now that we have the actual
2533 struct ethhdr
*ehdr
;
2534 skb_reset_mac_header(skb
);
2535 ehdr
= eth_hdr(skb
);
2536 if (ehdr
->h_proto
!= htons(ETH_P_8021Q
)) {
2542 skb
->protocol
= proto
;
2544 skb
->priority
= sk
->sk_priority
;
2545 skb
->mark
= sk
->sk_mark
;
2547 packet_pick_tx_queue(dev
, skb
);
2549 if (po
->has_vnet_hdr
) {
2550 if (vnet_hdr
.flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) {
2551 if (!skb_partial_csum_set(skb
, vnet_hdr
.csum_start
,
2552 vnet_hdr
.csum_offset
)) {
2558 skb_shinfo(skb
)->gso_size
= vnet_hdr
.gso_size
;
2559 skb_shinfo(skb
)->gso_type
= gso_type
;
2561 /* Header must be checked, and gso_segs computed. */
2562 skb_shinfo(skb
)->gso_type
|= SKB_GSO_DODGY
;
2563 skb_shinfo(skb
)->gso_segs
= 0;
2565 len
+= vnet_hdr_len
;
2568 if (!packet_use_direct_xmit(po
))
2569 skb_probe_transport_header(skb
, reserve
);
2570 if (unlikely(extra_len
== 4))
2573 err
= po
->xmit(skb
);
2574 if (err
> 0 && (err
= net_xmit_errno(err
)) != 0)
2590 static int packet_sendmsg(struct kiocb
*iocb
, struct socket
*sock
,
2591 struct msghdr
*msg
, size_t len
)
2593 struct sock
*sk
= sock
->sk
;
2594 struct packet_sock
*po
= pkt_sk(sk
);
2596 if (po
->tx_ring
.pg_vec
)
2597 return tpacket_snd(po
, msg
);
2599 return packet_snd(sock
, msg
, len
);
2603 * Close a PACKET socket. This is fairly simple. We immediately go
2604 * to 'closed' state and remove our protocol entry in the device list.
2607 static int packet_release(struct socket
*sock
)
2609 struct sock
*sk
= sock
->sk
;
2610 struct packet_sock
*po
;
2612 union tpacket_req_u req_u
;
2620 mutex_lock(&net
->packet
.sklist_lock
);
2621 sk_del_node_init_rcu(sk
);
2622 mutex_unlock(&net
->packet
.sklist_lock
);
2625 sock_prot_inuse_add(net
, sk
->sk_prot
, -1);
2628 spin_lock(&po
->bind_lock
);
2629 unregister_prot_hook(sk
, false);
2630 packet_cached_dev_reset(po
);
2632 if (po
->prot_hook
.dev
) {
2633 dev_put(po
->prot_hook
.dev
);
2634 po
->prot_hook
.dev
= NULL
;
2636 spin_unlock(&po
->bind_lock
);
2638 packet_flush_mclist(sk
);
2640 if (po
->rx_ring
.pg_vec
) {
2641 memset(&req_u
, 0, sizeof(req_u
));
2642 packet_set_ring(sk
, &req_u
, 1, 0);
2645 if (po
->tx_ring
.pg_vec
) {
2646 memset(&req_u
, 0, sizeof(req_u
));
2647 packet_set_ring(sk
, &req_u
, 1, 1);
2654 * Now the socket is dead. No more input will appear.
2661 skb_queue_purge(&sk
->sk_receive_queue
);
2662 packet_free_pending(po
);
2663 sk_refcnt_debug_release(sk
);
2670 * Attach a packet hook.
2673 static int packet_do_bind(struct sock
*sk
, struct net_device
*dev
, __be16 proto
)
2675 struct packet_sock
*po
= pkt_sk(sk
);
2676 const struct net_device
*dev_curr
;
2688 spin_lock(&po
->bind_lock
);
2690 proto_curr
= po
->prot_hook
.type
;
2691 dev_curr
= po
->prot_hook
.dev
;
2693 need_rehook
= proto_curr
!= proto
|| dev_curr
!= dev
;
2696 unregister_prot_hook(sk
, true);
2699 po
->prot_hook
.type
= proto
;
2701 if (po
->prot_hook
.dev
)
2702 dev_put(po
->prot_hook
.dev
);
2704 po
->prot_hook
.dev
= dev
;
2706 po
->ifindex
= dev
? dev
->ifindex
: 0;
2707 packet_cached_dev_assign(po
, dev
);
2710 if (proto
== 0 || !need_rehook
)
2713 if (!dev
|| (dev
->flags
& IFF_UP
)) {
2714 register_prot_hook(sk
);
2716 sk
->sk_err
= ENETDOWN
;
2717 if (!sock_flag(sk
, SOCK_DEAD
))
2718 sk
->sk_error_report(sk
);
2722 spin_unlock(&po
->bind_lock
);
2728 * Bind a packet socket to a device
2731 static int packet_bind_spkt(struct socket
*sock
, struct sockaddr
*uaddr
,
2734 struct sock
*sk
= sock
->sk
;
2736 struct net_device
*dev
;
2743 if (addr_len
!= sizeof(struct sockaddr
))
2745 strlcpy(name
, uaddr
->sa_data
, sizeof(name
));
2747 dev
= dev_get_by_name(sock_net(sk
), name
);
2749 err
= packet_do_bind(sk
, dev
, pkt_sk(sk
)->num
);
2753 static int packet_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
)
2755 struct sockaddr_ll
*sll
= (struct sockaddr_ll
*)uaddr
;
2756 struct sock
*sk
= sock
->sk
;
2757 struct net_device
*dev
= NULL
;
2765 if (addr_len
< sizeof(struct sockaddr_ll
))
2767 if (sll
->sll_family
!= AF_PACKET
)
2770 if (sll
->sll_ifindex
) {
2772 dev
= dev_get_by_index(sock_net(sk
), sll
->sll_ifindex
);
2776 err
= packet_do_bind(sk
, dev
, sll
->sll_protocol
? : pkt_sk(sk
)->num
);
2782 static struct proto packet_proto
= {
2784 .owner
= THIS_MODULE
,
2785 .obj_size
= sizeof(struct packet_sock
),
2789 * Create a packet of type SOCK_PACKET.
2792 static int packet_create(struct net
*net
, struct socket
*sock
, int protocol
,
2796 struct packet_sock
*po
;
2797 __be16 proto
= (__force __be16
)protocol
; /* weird, but documented */
2800 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
))
2802 if (sock
->type
!= SOCK_DGRAM
&& sock
->type
!= SOCK_RAW
&&
2803 sock
->type
!= SOCK_PACKET
)
2804 return -ESOCKTNOSUPPORT
;
2806 sock
->state
= SS_UNCONNECTED
;
2809 sk
= sk_alloc(net
, PF_PACKET
, GFP_KERNEL
, &packet_proto
);
2813 sock
->ops
= &packet_ops
;
2814 if (sock
->type
== SOCK_PACKET
)
2815 sock
->ops
= &packet_ops_spkt
;
2817 sock_init_data(sock
, sk
);
2820 sk
->sk_family
= PF_PACKET
;
2822 po
->xmit
= dev_queue_xmit
;
2824 err
= packet_alloc_pending(po
);
2828 packet_cached_dev_reset(po
);
2830 sk
->sk_destruct
= packet_sock_destruct
;
2831 sk_refcnt_debug_inc(sk
);
2834 * Attach a protocol block
2837 spin_lock_init(&po
->bind_lock
);
2838 mutex_init(&po
->pg_vec_lock
);
2839 po
->prot_hook
.func
= packet_rcv
;
2841 if (sock
->type
== SOCK_PACKET
)
2842 po
->prot_hook
.func
= packet_rcv_spkt
;
2844 po
->prot_hook
.af_packet_priv
= sk
;
2847 po
->prot_hook
.type
= proto
;
2848 register_prot_hook(sk
);
2851 mutex_lock(&net
->packet
.sklist_lock
);
2852 sk_add_node_rcu(sk
, &net
->packet
.sklist
);
2853 mutex_unlock(&net
->packet
.sklist_lock
);
2856 sock_prot_inuse_add(net
, &packet_proto
, 1);
2867 * Pull a packet from our receive queue and hand it to the user.
2868 * If necessary we block.
2871 static int packet_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
2872 struct msghdr
*msg
, size_t len
, int flags
)
2874 struct sock
*sk
= sock
->sk
;
2875 struct sk_buff
*skb
;
2877 int vnet_hdr_len
= 0;
2880 if (flags
& ~(MSG_PEEK
|MSG_DONTWAIT
|MSG_TRUNC
|MSG_CMSG_COMPAT
|MSG_ERRQUEUE
))
2884 /* What error should we return now? EUNATTACH? */
2885 if (pkt_sk(sk
)->ifindex
< 0)
2889 if (flags
& MSG_ERRQUEUE
) {
2890 err
= sock_recv_errqueue(sk
, msg
, len
,
2891 SOL_PACKET
, PACKET_TX_TIMESTAMP
);
2896 * Call the generic datagram receiver. This handles all sorts
2897 * of horrible races and re-entrancy so we can forget about it
2898 * in the protocol layers.
2900 * Now it will return ENETDOWN, if device have just gone down,
2901 * but then it will block.
2904 skb
= skb_recv_datagram(sk
, flags
, flags
& MSG_DONTWAIT
, &err
);
2907 * An error occurred so return it. Because skb_recv_datagram()
2908 * handles the blocking we don't see and worry about blocking
2915 if (pkt_sk(sk
)->has_vnet_hdr
) {
2916 struct virtio_net_hdr vnet_hdr
= { 0 };
2919 vnet_hdr_len
= sizeof(vnet_hdr
);
2920 if (len
< vnet_hdr_len
)
2923 len
-= vnet_hdr_len
;
2925 if (skb_is_gso(skb
)) {
2926 struct skb_shared_info
*sinfo
= skb_shinfo(skb
);
2928 /* This is a hint as to how much should be linear. */
2929 vnet_hdr
.hdr_len
= skb_headlen(skb
);
2930 vnet_hdr
.gso_size
= sinfo
->gso_size
;
2931 if (sinfo
->gso_type
& SKB_GSO_TCPV4
)
2932 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV4
;
2933 else if (sinfo
->gso_type
& SKB_GSO_TCPV6
)
2934 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV6
;
2935 else if (sinfo
->gso_type
& SKB_GSO_UDP
)
2936 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_UDP
;
2937 else if (sinfo
->gso_type
& SKB_GSO_FCOE
)
2941 if (sinfo
->gso_type
& SKB_GSO_TCP_ECN
)
2942 vnet_hdr
.gso_type
|= VIRTIO_NET_HDR_GSO_ECN
;
2944 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_NONE
;
2946 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2947 vnet_hdr
.flags
= VIRTIO_NET_HDR_F_NEEDS_CSUM
;
2948 vnet_hdr
.csum_start
= skb_checksum_start_offset(skb
);
2949 vnet_hdr
.csum_offset
= skb
->csum_offset
;
2950 } else if (skb
->ip_summed
== CHECKSUM_UNNECESSARY
) {
2951 vnet_hdr
.flags
= VIRTIO_NET_HDR_F_DATA_VALID
;
2952 } /* else everything is zero */
2954 err
= memcpy_to_msg(msg
, (void *)&vnet_hdr
, vnet_hdr_len
);
2959 /* You lose any data beyond the buffer you gave. If it worries
2960 * a user program they can ask the device for its MTU
2966 msg
->msg_flags
|= MSG_TRUNC
;
2969 err
= skb_copy_datagram_msg(skb
, 0, msg
, copied
);
2973 sock_recv_ts_and_drops(msg
, sk
, skb
);
2975 if (msg
->msg_name
) {
2976 /* If the address length field is there to be filled
2977 * in, we fill it in now.
2979 if (sock
->type
== SOCK_PACKET
) {
2980 __sockaddr_check_size(sizeof(struct sockaddr_pkt
));
2981 msg
->msg_namelen
= sizeof(struct sockaddr_pkt
);
2983 struct sockaddr_ll
*sll
= &PACKET_SKB_CB(skb
)->sa
.ll
;
2984 msg
->msg_namelen
= sll
->sll_halen
+
2985 offsetof(struct sockaddr_ll
, sll_addr
);
2987 memcpy(msg
->msg_name
, &PACKET_SKB_CB(skb
)->sa
,
2991 if (pkt_sk(sk
)->auxdata
) {
2992 struct tpacket_auxdata aux
;
2994 aux
.tp_status
= TP_STATUS_USER
;
2995 if (skb
->ip_summed
== CHECKSUM_PARTIAL
)
2996 aux
.tp_status
|= TP_STATUS_CSUMNOTREADY
;
2997 aux
.tp_len
= PACKET_SKB_CB(skb
)->origlen
;
2998 aux
.tp_snaplen
= skb
->len
;
3000 aux
.tp_net
= skb_network_offset(skb
);
3001 if (vlan_tx_tag_present(skb
)) {
3002 aux
.tp_vlan_tci
= vlan_tx_tag_get(skb
);
3003 aux
.tp_vlan_tpid
= ntohs(skb
->vlan_proto
);
3004 aux
.tp_status
|= TP_STATUS_VLAN_VALID
| TP_STATUS_VLAN_TPID_VALID
;
3006 aux
.tp_vlan_tci
= 0;
3007 aux
.tp_vlan_tpid
= 0;
3009 put_cmsg(msg
, SOL_PACKET
, PACKET_AUXDATA
, sizeof(aux
), &aux
);
3013 * Free or return the buffer as appropriate. Again this
3014 * hides all the races and re-entrancy issues from us.
3016 err
= vnet_hdr_len
+ ((flags
&MSG_TRUNC
) ? skb
->len
: copied
);
3019 skb_free_datagram(sk
, skb
);
3024 static int packet_getname_spkt(struct socket
*sock
, struct sockaddr
*uaddr
,
3025 int *uaddr_len
, int peer
)
3027 struct net_device
*dev
;
3028 struct sock
*sk
= sock
->sk
;
3033 uaddr
->sa_family
= AF_PACKET
;
3034 memset(uaddr
->sa_data
, 0, sizeof(uaddr
->sa_data
));
3036 dev
= dev_get_by_index_rcu(sock_net(sk
), pkt_sk(sk
)->ifindex
);
3038 strlcpy(uaddr
->sa_data
, dev
->name
, sizeof(uaddr
->sa_data
));
3040 *uaddr_len
= sizeof(*uaddr
);
3045 static int packet_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
3046 int *uaddr_len
, int peer
)
3048 struct net_device
*dev
;
3049 struct sock
*sk
= sock
->sk
;
3050 struct packet_sock
*po
= pkt_sk(sk
);
3051 DECLARE_SOCKADDR(struct sockaddr_ll
*, sll
, uaddr
);
3056 sll
->sll_family
= AF_PACKET
;
3057 sll
->sll_ifindex
= po
->ifindex
;
3058 sll
->sll_protocol
= po
->num
;
3059 sll
->sll_pkttype
= 0;
3061 dev
= dev_get_by_index_rcu(sock_net(sk
), po
->ifindex
);
3063 sll
->sll_hatype
= dev
->type
;
3064 sll
->sll_halen
= dev
->addr_len
;
3065 memcpy(sll
->sll_addr
, dev
->dev_addr
, dev
->addr_len
);
3067 sll
->sll_hatype
= 0; /* Bad: we have no ARPHRD_UNSPEC */
3071 *uaddr_len
= offsetof(struct sockaddr_ll
, sll_addr
) + sll
->sll_halen
;
3076 static int packet_dev_mc(struct net_device
*dev
, struct packet_mclist
*i
,
3080 case PACKET_MR_MULTICAST
:
3081 if (i
->alen
!= dev
->addr_len
)
3084 return dev_mc_add(dev
, i
->addr
);
3086 return dev_mc_del(dev
, i
->addr
);
3088 case PACKET_MR_PROMISC
:
3089 return dev_set_promiscuity(dev
, what
);
3090 case PACKET_MR_ALLMULTI
:
3091 return dev_set_allmulti(dev
, what
);
3092 case PACKET_MR_UNICAST
:
3093 if (i
->alen
!= dev
->addr_len
)
3096 return dev_uc_add(dev
, i
->addr
);
3098 return dev_uc_del(dev
, i
->addr
);
3106 static void packet_dev_mclist(struct net_device
*dev
, struct packet_mclist
*i
, int what
)
3108 for ( ; i
; i
= i
->next
) {
3109 if (i
->ifindex
== dev
->ifindex
)
3110 packet_dev_mc(dev
, i
, what
);
3114 static int packet_mc_add(struct sock
*sk
, struct packet_mreq_max
*mreq
)
3116 struct packet_sock
*po
= pkt_sk(sk
);
3117 struct packet_mclist
*ml
, *i
;
3118 struct net_device
*dev
;
3124 dev
= __dev_get_by_index(sock_net(sk
), mreq
->mr_ifindex
);
3129 if (mreq
->mr_alen
> dev
->addr_len
)
3133 i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
3138 for (ml
= po
->mclist
; ml
; ml
= ml
->next
) {
3139 if (ml
->ifindex
== mreq
->mr_ifindex
&&
3140 ml
->type
== mreq
->mr_type
&&
3141 ml
->alen
== mreq
->mr_alen
&&
3142 memcmp(ml
->addr
, mreq
->mr_address
, ml
->alen
) == 0) {
3144 /* Free the new element ... */
3150 i
->type
= mreq
->mr_type
;
3151 i
->ifindex
= mreq
->mr_ifindex
;
3152 i
->alen
= mreq
->mr_alen
;
3153 memcpy(i
->addr
, mreq
->mr_address
, i
->alen
);
3155 i
->next
= po
->mclist
;
3157 err
= packet_dev_mc(dev
, i
, 1);
3159 po
->mclist
= i
->next
;
3168 static int packet_mc_drop(struct sock
*sk
, struct packet_mreq_max
*mreq
)
3170 struct packet_mclist
*ml
, **mlp
;
3174 for (mlp
= &pkt_sk(sk
)->mclist
; (ml
= *mlp
) != NULL
; mlp
= &ml
->next
) {
3175 if (ml
->ifindex
== mreq
->mr_ifindex
&&
3176 ml
->type
== mreq
->mr_type
&&
3177 ml
->alen
== mreq
->mr_alen
&&
3178 memcmp(ml
->addr
, mreq
->mr_address
, ml
->alen
) == 0) {
3179 if (--ml
->count
== 0) {
3180 struct net_device
*dev
;
3182 dev
= __dev_get_by_index(sock_net(sk
), ml
->ifindex
);
3184 packet_dev_mc(dev
, ml
, -1);
3192 return -EADDRNOTAVAIL
;
3195 static void packet_flush_mclist(struct sock
*sk
)
3197 struct packet_sock
*po
= pkt_sk(sk
);
3198 struct packet_mclist
*ml
;
3204 while ((ml
= po
->mclist
) != NULL
) {
3205 struct net_device
*dev
;
3207 po
->mclist
= ml
->next
;
3208 dev
= __dev_get_by_index(sock_net(sk
), ml
->ifindex
);
3210 packet_dev_mc(dev
, ml
, -1);
3217 packet_setsockopt(struct socket
*sock
, int level
, int optname
, char __user
*optval
, unsigned int optlen
)
3219 struct sock
*sk
= sock
->sk
;
3220 struct packet_sock
*po
= pkt_sk(sk
);
3223 if (level
!= SOL_PACKET
)
3224 return -ENOPROTOOPT
;
3227 case PACKET_ADD_MEMBERSHIP
:
3228 case PACKET_DROP_MEMBERSHIP
:
3230 struct packet_mreq_max mreq
;
3232 memset(&mreq
, 0, sizeof(mreq
));
3233 if (len
< sizeof(struct packet_mreq
))
3235 if (len
> sizeof(mreq
))
3237 if (copy_from_user(&mreq
, optval
, len
))
3239 if (len
< (mreq
.mr_alen
+ offsetof(struct packet_mreq
, mr_address
)))
3241 if (optname
== PACKET_ADD_MEMBERSHIP
)
3242 ret
= packet_mc_add(sk
, &mreq
);
3244 ret
= packet_mc_drop(sk
, &mreq
);
3248 case PACKET_RX_RING
:
3249 case PACKET_TX_RING
:
3251 union tpacket_req_u req_u
;
3254 switch (po
->tp_version
) {
3257 len
= sizeof(req_u
.req
);
3261 len
= sizeof(req_u
.req3
);
3266 if (pkt_sk(sk
)->has_vnet_hdr
)
3268 if (copy_from_user(&req_u
.req
, optval
, len
))
3270 return packet_set_ring(sk
, &req_u
, 0,
3271 optname
== PACKET_TX_RING
);
3273 case PACKET_COPY_THRESH
:
3277 if (optlen
!= sizeof(val
))
3279 if (copy_from_user(&val
, optval
, sizeof(val
)))
3282 pkt_sk(sk
)->copy_thresh
= val
;
3285 case PACKET_VERSION
:
3289 if (optlen
!= sizeof(val
))
3291 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3293 if (copy_from_user(&val
, optval
, sizeof(val
)))
3299 po
->tp_version
= val
;
3305 case PACKET_RESERVE
:
3309 if (optlen
!= sizeof(val
))
3311 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3313 if (copy_from_user(&val
, optval
, sizeof(val
)))
3315 po
->tp_reserve
= val
;
3322 if (optlen
!= sizeof(val
))
3324 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3326 if (copy_from_user(&val
, optval
, sizeof(val
)))
3328 po
->tp_loss
= !!val
;
3331 case PACKET_AUXDATA
:
3335 if (optlen
< sizeof(val
))
3337 if (copy_from_user(&val
, optval
, sizeof(val
)))
3340 po
->auxdata
= !!val
;
3343 case PACKET_ORIGDEV
:
3347 if (optlen
< sizeof(val
))
3349 if (copy_from_user(&val
, optval
, sizeof(val
)))
3352 po
->origdev
= !!val
;
3355 case PACKET_VNET_HDR
:
3359 if (sock
->type
!= SOCK_RAW
)
3361 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3363 if (optlen
< sizeof(val
))
3365 if (copy_from_user(&val
, optval
, sizeof(val
)))
3368 po
->has_vnet_hdr
= !!val
;
3371 case PACKET_TIMESTAMP
:
3375 if (optlen
!= sizeof(val
))
3377 if (copy_from_user(&val
, optval
, sizeof(val
)))
3380 po
->tp_tstamp
= val
;
3387 if (optlen
!= sizeof(val
))
3389 if (copy_from_user(&val
, optval
, sizeof(val
)))
3392 return fanout_add(sk
, val
& 0xffff, val
>> 16);
3394 case PACKET_TX_HAS_OFF
:
3398 if (optlen
!= sizeof(val
))
3400 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3402 if (copy_from_user(&val
, optval
, sizeof(val
)))
3404 po
->tp_tx_has_off
= !!val
;
3407 case PACKET_QDISC_BYPASS
:
3411 if (optlen
!= sizeof(val
))
3413 if (copy_from_user(&val
, optval
, sizeof(val
)))
3416 po
->xmit
= val
? packet_direct_xmit
: dev_queue_xmit
;
3420 return -ENOPROTOOPT
;
3424 static int packet_getsockopt(struct socket
*sock
, int level
, int optname
,
3425 char __user
*optval
, int __user
*optlen
)
3428 int val
, lv
= sizeof(val
);
3429 struct sock
*sk
= sock
->sk
;
3430 struct packet_sock
*po
= pkt_sk(sk
);
3432 union tpacket_stats_u st
;
3434 if (level
!= SOL_PACKET
)
3435 return -ENOPROTOOPT
;
3437 if (get_user(len
, optlen
))
3444 case PACKET_STATISTICS
:
3445 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
3446 memcpy(&st
, &po
->stats
, sizeof(st
));
3447 memset(&po
->stats
, 0, sizeof(po
->stats
));
3448 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
3450 if (po
->tp_version
== TPACKET_V3
) {
3451 lv
= sizeof(struct tpacket_stats_v3
);
3452 st
.stats3
.tp_packets
+= st
.stats3
.tp_drops
;
3455 lv
= sizeof(struct tpacket_stats
);
3456 st
.stats1
.tp_packets
+= st
.stats1
.tp_drops
;
3461 case PACKET_AUXDATA
:
3464 case PACKET_ORIGDEV
:
3467 case PACKET_VNET_HDR
:
3468 val
= po
->has_vnet_hdr
;
3470 case PACKET_VERSION
:
3471 val
= po
->tp_version
;
3474 if (len
> sizeof(int))
3476 if (copy_from_user(&val
, optval
, len
))
3480 val
= sizeof(struct tpacket_hdr
);
3483 val
= sizeof(struct tpacket2_hdr
);
3486 val
= sizeof(struct tpacket3_hdr
);
3492 case PACKET_RESERVE
:
3493 val
= po
->tp_reserve
;
3498 case PACKET_TIMESTAMP
:
3499 val
= po
->tp_tstamp
;
3503 ((u32
)po
->fanout
->id
|
3504 ((u32
)po
->fanout
->type
<< 16) |
3505 ((u32
)po
->fanout
->flags
<< 24)) :
3508 case PACKET_TX_HAS_OFF
:
3509 val
= po
->tp_tx_has_off
;
3511 case PACKET_QDISC_BYPASS
:
3512 val
= packet_use_direct_xmit(po
);
3515 return -ENOPROTOOPT
;
3520 if (put_user(len
, optlen
))
3522 if (copy_to_user(optval
, data
, len
))
3528 static int packet_notifier(struct notifier_block
*this,
3529 unsigned long msg
, void *ptr
)
3532 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
3533 struct net
*net
= dev_net(dev
);
3536 sk_for_each_rcu(sk
, &net
->packet
.sklist
) {
3537 struct packet_sock
*po
= pkt_sk(sk
);
3540 case NETDEV_UNREGISTER
:
3542 packet_dev_mclist(dev
, po
->mclist
, -1);
3546 if (dev
->ifindex
== po
->ifindex
) {
3547 spin_lock(&po
->bind_lock
);
3549 __unregister_prot_hook(sk
, false);
3550 sk
->sk_err
= ENETDOWN
;
3551 if (!sock_flag(sk
, SOCK_DEAD
))
3552 sk
->sk_error_report(sk
);
3554 if (msg
== NETDEV_UNREGISTER
) {
3555 packet_cached_dev_reset(po
);
3557 if (po
->prot_hook
.dev
)
3558 dev_put(po
->prot_hook
.dev
);
3559 po
->prot_hook
.dev
= NULL
;
3561 spin_unlock(&po
->bind_lock
);
3565 if (dev
->ifindex
== po
->ifindex
) {
3566 spin_lock(&po
->bind_lock
);
3568 register_prot_hook(sk
);
3569 spin_unlock(&po
->bind_lock
);
3579 static int packet_ioctl(struct socket
*sock
, unsigned int cmd
,
3582 struct sock
*sk
= sock
->sk
;
3587 int amount
= sk_wmem_alloc_get(sk
);
3589 return put_user(amount
, (int __user
*)arg
);
3593 struct sk_buff
*skb
;
3596 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
3597 skb
= skb_peek(&sk
->sk_receive_queue
);
3600 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
3601 return put_user(amount
, (int __user
*)arg
);
3604 return sock_get_timestamp(sk
, (struct timeval __user
*)arg
);
3606 return sock_get_timestampns(sk
, (struct timespec __user
*)arg
);
3616 case SIOCGIFBRDADDR
:
3617 case SIOCSIFBRDADDR
:
3618 case SIOCGIFNETMASK
:
3619 case SIOCSIFNETMASK
:
3620 case SIOCGIFDSTADDR
:
3621 case SIOCSIFDSTADDR
:
3623 return inet_dgram_ops
.ioctl(sock
, cmd
, arg
);
3627 return -ENOIOCTLCMD
;
3632 static unsigned int packet_poll(struct file
*file
, struct socket
*sock
,
3635 struct sock
*sk
= sock
->sk
;
3636 struct packet_sock
*po
= pkt_sk(sk
);
3637 unsigned int mask
= datagram_poll(file
, sock
, wait
);
3639 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
3640 if (po
->rx_ring
.pg_vec
) {
3641 if (!packet_previous_rx_frame(po
, &po
->rx_ring
,
3643 mask
|= POLLIN
| POLLRDNORM
;
3645 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
3646 spin_lock_bh(&sk
->sk_write_queue
.lock
);
3647 if (po
->tx_ring
.pg_vec
) {
3648 if (packet_current_frame(po
, &po
->tx_ring
, TP_STATUS_AVAILABLE
))
3649 mask
|= POLLOUT
| POLLWRNORM
;
3651 spin_unlock_bh(&sk
->sk_write_queue
.lock
);
3656 /* Dirty? Well, I still did not learn better way to account
3660 static void packet_mm_open(struct vm_area_struct
*vma
)
3662 struct file
*file
= vma
->vm_file
;
3663 struct socket
*sock
= file
->private_data
;
3664 struct sock
*sk
= sock
->sk
;
3667 atomic_inc(&pkt_sk(sk
)->mapped
);
3670 static void packet_mm_close(struct vm_area_struct
*vma
)
3672 struct file
*file
= vma
->vm_file
;
3673 struct socket
*sock
= file
->private_data
;
3674 struct sock
*sk
= sock
->sk
;
3677 atomic_dec(&pkt_sk(sk
)->mapped
);
3680 static const struct vm_operations_struct packet_mmap_ops
= {
3681 .open
= packet_mm_open
,
3682 .close
= packet_mm_close
,
3685 static void free_pg_vec(struct pgv
*pg_vec
, unsigned int order
,
3690 for (i
= 0; i
< len
; i
++) {
3691 if (likely(pg_vec
[i
].buffer
)) {
3692 if (is_vmalloc_addr(pg_vec
[i
].buffer
))
3693 vfree(pg_vec
[i
].buffer
);
3695 free_pages((unsigned long)pg_vec
[i
].buffer
,
3697 pg_vec
[i
].buffer
= NULL
;
3703 static char *alloc_one_pg_vec_page(unsigned long order
)
3706 gfp_t gfp_flags
= GFP_KERNEL
| __GFP_COMP
|
3707 __GFP_ZERO
| __GFP_NOWARN
| __GFP_NORETRY
;
3709 buffer
= (char *) __get_free_pages(gfp_flags
, order
);
3713 /* __get_free_pages failed, fall back to vmalloc */
3714 buffer
= vzalloc((1 << order
) * PAGE_SIZE
);
3718 /* vmalloc failed, lets dig into swap here */
3719 gfp_flags
&= ~__GFP_NORETRY
;
3720 buffer
= (char *) __get_free_pages(gfp_flags
, order
);
3724 /* complete and utter failure */
3728 static struct pgv
*alloc_pg_vec(struct tpacket_req
*req
, int order
)
3730 unsigned int block_nr
= req
->tp_block_nr
;
3734 pg_vec
= kcalloc(block_nr
, sizeof(struct pgv
), GFP_KERNEL
);
3735 if (unlikely(!pg_vec
))
3738 for (i
= 0; i
< block_nr
; i
++) {
3739 pg_vec
[i
].buffer
= alloc_one_pg_vec_page(order
);
3740 if (unlikely(!pg_vec
[i
].buffer
))
3741 goto out_free_pgvec
;
3748 free_pg_vec(pg_vec
, order
, block_nr
);
3753 static int packet_set_ring(struct sock
*sk
, union tpacket_req_u
*req_u
,
3754 int closing
, int tx_ring
)
3756 struct pgv
*pg_vec
= NULL
;
3757 struct packet_sock
*po
= pkt_sk(sk
);
3758 int was_running
, order
= 0;
3759 struct packet_ring_buffer
*rb
;
3760 struct sk_buff_head
*rb_queue
;
3763 /* Added to avoid minimal code churn */
3764 struct tpacket_req
*req
= &req_u
->req
;
3766 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
3767 if (!closing
&& tx_ring
&& (po
->tp_version
> TPACKET_V2
)) {
3768 WARN(1, "Tx-ring is not supported.\n");
3772 rb
= tx_ring
? &po
->tx_ring
: &po
->rx_ring
;
3773 rb_queue
= tx_ring
? &sk
->sk_write_queue
: &sk
->sk_receive_queue
;
3777 if (atomic_read(&po
->mapped
))
3779 if (packet_read_pending(rb
))
3783 if (req
->tp_block_nr
) {
3784 /* Sanity tests and some calculations */
3786 if (unlikely(rb
->pg_vec
))
3789 switch (po
->tp_version
) {
3791 po
->tp_hdrlen
= TPACKET_HDRLEN
;
3794 po
->tp_hdrlen
= TPACKET2_HDRLEN
;
3797 po
->tp_hdrlen
= TPACKET3_HDRLEN
;
3802 if (unlikely((int)req
->tp_block_size
<= 0))
3804 if (unlikely(req
->tp_block_size
& (PAGE_SIZE
- 1)))
3806 if (po
->tp_version
>= TPACKET_V3
&&
3807 (int)(req
->tp_block_size
-
3808 BLK_PLUS_PRIV(req_u
->req3
.tp_sizeof_priv
)) <= 0)
3810 if (unlikely(req
->tp_frame_size
< po
->tp_hdrlen
+
3813 if (unlikely(req
->tp_frame_size
& (TPACKET_ALIGNMENT
- 1)))
3816 rb
->frames_per_block
= req
->tp_block_size
/req
->tp_frame_size
;
3817 if (unlikely(rb
->frames_per_block
<= 0))
3819 if (unlikely((rb
->frames_per_block
* req
->tp_block_nr
) !=
3824 order
= get_order(req
->tp_block_size
);
3825 pg_vec
= alloc_pg_vec(req
, order
);
3826 if (unlikely(!pg_vec
))
3828 switch (po
->tp_version
) {
3830 /* Transmit path is not supported. We checked
3831 * it above but just being paranoid
3834 init_prb_bdqc(po
, rb
, pg_vec
, req_u
, tx_ring
);
3843 if (unlikely(req
->tp_frame_nr
))
3849 /* Detach socket from network */
3850 spin_lock(&po
->bind_lock
);
3851 was_running
= po
->running
;
3855 __unregister_prot_hook(sk
, false);
3857 spin_unlock(&po
->bind_lock
);
3862 mutex_lock(&po
->pg_vec_lock
);
3863 if (closing
|| atomic_read(&po
->mapped
) == 0) {
3865 spin_lock_bh(&rb_queue
->lock
);
3866 swap(rb
->pg_vec
, pg_vec
);
3867 rb
->frame_max
= (req
->tp_frame_nr
- 1);
3869 rb
->frame_size
= req
->tp_frame_size
;
3870 spin_unlock_bh(&rb_queue
->lock
);
3872 swap(rb
->pg_vec_order
, order
);
3873 swap(rb
->pg_vec_len
, req
->tp_block_nr
);
3875 rb
->pg_vec_pages
= req
->tp_block_size
/PAGE_SIZE
;
3876 po
->prot_hook
.func
= (po
->rx_ring
.pg_vec
) ?
3877 tpacket_rcv
: packet_rcv
;
3878 skb_queue_purge(rb_queue
);
3879 if (atomic_read(&po
->mapped
))
3880 pr_err("packet_mmap: vma is busy: %d\n",
3881 atomic_read(&po
->mapped
));
3883 mutex_unlock(&po
->pg_vec_lock
);
3885 spin_lock(&po
->bind_lock
);
3888 register_prot_hook(sk
);
3890 spin_unlock(&po
->bind_lock
);
3891 if (closing
&& (po
->tp_version
> TPACKET_V2
)) {
3892 /* Because we don't support block-based V3 on tx-ring */
3894 prb_shutdown_retire_blk_timer(po
, tx_ring
, rb_queue
);
3899 free_pg_vec(pg_vec
, order
, req
->tp_block_nr
);
3904 static int packet_mmap(struct file
*file
, struct socket
*sock
,
3905 struct vm_area_struct
*vma
)
3907 struct sock
*sk
= sock
->sk
;
3908 struct packet_sock
*po
= pkt_sk(sk
);
3909 unsigned long size
, expected_size
;
3910 struct packet_ring_buffer
*rb
;
3911 unsigned long start
;
3918 mutex_lock(&po
->pg_vec_lock
);
3921 for (rb
= &po
->rx_ring
; rb
<= &po
->tx_ring
; rb
++) {
3923 expected_size
+= rb
->pg_vec_len
3929 if (expected_size
== 0)
3932 size
= vma
->vm_end
- vma
->vm_start
;
3933 if (size
!= expected_size
)
3936 start
= vma
->vm_start
;
3937 for (rb
= &po
->rx_ring
; rb
<= &po
->tx_ring
; rb
++) {
3938 if (rb
->pg_vec
== NULL
)
3941 for (i
= 0; i
< rb
->pg_vec_len
; i
++) {
3943 void *kaddr
= rb
->pg_vec
[i
].buffer
;
3946 for (pg_num
= 0; pg_num
< rb
->pg_vec_pages
; pg_num
++) {
3947 page
= pgv_to_page(kaddr
);
3948 err
= vm_insert_page(vma
, start
, page
);
3957 atomic_inc(&po
->mapped
);
3958 vma
->vm_ops
= &packet_mmap_ops
;
3962 mutex_unlock(&po
->pg_vec_lock
);
3966 static const struct proto_ops packet_ops_spkt
= {
3967 .family
= PF_PACKET
,
3968 .owner
= THIS_MODULE
,
3969 .release
= packet_release
,
3970 .bind
= packet_bind_spkt
,
3971 .connect
= sock_no_connect
,
3972 .socketpair
= sock_no_socketpair
,
3973 .accept
= sock_no_accept
,
3974 .getname
= packet_getname_spkt
,
3975 .poll
= datagram_poll
,
3976 .ioctl
= packet_ioctl
,
3977 .listen
= sock_no_listen
,
3978 .shutdown
= sock_no_shutdown
,
3979 .setsockopt
= sock_no_setsockopt
,
3980 .getsockopt
= sock_no_getsockopt
,
3981 .sendmsg
= packet_sendmsg_spkt
,
3982 .recvmsg
= packet_recvmsg
,
3983 .mmap
= sock_no_mmap
,
3984 .sendpage
= sock_no_sendpage
,
3987 static const struct proto_ops packet_ops
= {
3988 .family
= PF_PACKET
,
3989 .owner
= THIS_MODULE
,
3990 .release
= packet_release
,
3991 .bind
= packet_bind
,
3992 .connect
= sock_no_connect
,
3993 .socketpair
= sock_no_socketpair
,
3994 .accept
= sock_no_accept
,
3995 .getname
= packet_getname
,
3996 .poll
= packet_poll
,
3997 .ioctl
= packet_ioctl
,
3998 .listen
= sock_no_listen
,
3999 .shutdown
= sock_no_shutdown
,
4000 .setsockopt
= packet_setsockopt
,
4001 .getsockopt
= packet_getsockopt
,
4002 .sendmsg
= packet_sendmsg
,
4003 .recvmsg
= packet_recvmsg
,
4004 .mmap
= packet_mmap
,
4005 .sendpage
= sock_no_sendpage
,
4008 static const struct net_proto_family packet_family_ops
= {
4009 .family
= PF_PACKET
,
4010 .create
= packet_create
,
4011 .owner
= THIS_MODULE
,
4014 static struct notifier_block packet_netdev_notifier
= {
4015 .notifier_call
= packet_notifier
,
4018 #ifdef CONFIG_PROC_FS
4020 static void *packet_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4023 struct net
*net
= seq_file_net(seq
);
4026 return seq_hlist_start_head_rcu(&net
->packet
.sklist
, *pos
);
4029 static void *packet_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4031 struct net
*net
= seq_file_net(seq
);
4032 return seq_hlist_next_rcu(v
, &net
->packet
.sklist
, pos
);
4035 static void packet_seq_stop(struct seq_file
*seq
, void *v
)
4041 static int packet_seq_show(struct seq_file
*seq
, void *v
)
4043 if (v
== SEQ_START_TOKEN
)
4044 seq_puts(seq
, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4046 struct sock
*s
= sk_entry(v
);
4047 const struct packet_sock
*po
= pkt_sk(s
);
4050 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
4052 atomic_read(&s
->sk_refcnt
),
4057 atomic_read(&s
->sk_rmem_alloc
),
4058 from_kuid_munged(seq_user_ns(seq
), sock_i_uid(s
)),
4065 static const struct seq_operations packet_seq_ops
= {
4066 .start
= packet_seq_start
,
4067 .next
= packet_seq_next
,
4068 .stop
= packet_seq_stop
,
4069 .show
= packet_seq_show
,
4072 static int packet_seq_open(struct inode
*inode
, struct file
*file
)
4074 return seq_open_net(inode
, file
, &packet_seq_ops
,
4075 sizeof(struct seq_net_private
));
4078 static const struct file_operations packet_seq_fops
= {
4079 .owner
= THIS_MODULE
,
4080 .open
= packet_seq_open
,
4082 .llseek
= seq_lseek
,
4083 .release
= seq_release_net
,
4088 static int __net_init
packet_net_init(struct net
*net
)
4090 mutex_init(&net
->packet
.sklist_lock
);
4091 INIT_HLIST_HEAD(&net
->packet
.sklist
);
4093 if (!proc_create("packet", 0, net
->proc_net
, &packet_seq_fops
))
4099 static void __net_exit
packet_net_exit(struct net
*net
)
4101 remove_proc_entry("packet", net
->proc_net
);
4104 static struct pernet_operations packet_net_ops
= {
4105 .init
= packet_net_init
,
4106 .exit
= packet_net_exit
,
4110 static void __exit
packet_exit(void)
4112 unregister_netdevice_notifier(&packet_netdev_notifier
);
4113 unregister_pernet_subsys(&packet_net_ops
);
4114 sock_unregister(PF_PACKET
);
4115 proto_unregister(&packet_proto
);
4118 static int __init
packet_init(void)
4120 int rc
= proto_register(&packet_proto
, 0);
4125 sock_register(&packet_family_ops
);
4126 register_pernet_subsys(&packet_net_ops
);
4127 register_netdevice_notifier(&packet_netdev_notifier
);
4132 module_init(packet_init
);
4133 module_exit(packet_exit
);
4134 MODULE_LICENSE("GPL");
4135 MODULE_ALIAS_NETPROTO(PF_PACKET
);