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
,
521 struct sk_buff_head
*rb_queue
)
523 struct tpacket_kbdq_core
*pkc
;
525 pkc
= GET_PBDQC_FROM_RB(&po
->rx_ring
);
527 spin_lock_bh(&rb_queue
->lock
);
528 pkc
->delete_blk_timer
= 1;
529 spin_unlock_bh(&rb_queue
->lock
);
531 prb_del_retire_blk_timer(pkc
);
534 static void prb_init_blk_timer(struct packet_sock
*po
,
535 struct tpacket_kbdq_core
*pkc
,
536 void (*func
) (unsigned long))
538 init_timer(&pkc
->retire_blk_timer
);
539 pkc
->retire_blk_timer
.data
= (long)po
;
540 pkc
->retire_blk_timer
.function
= func
;
541 pkc
->retire_blk_timer
.expires
= jiffies
;
544 static void prb_setup_retire_blk_timer(struct packet_sock
*po
)
546 struct tpacket_kbdq_core
*pkc
;
548 pkc
= 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
)
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
);
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 if (!BLOCK_NUM_PKTS(pbd
)) {
702 /* An empty block. Just refresh the timer. */
705 prb_retire_current_block(pkc
, po
, TP_STATUS_BLK_TMO
);
706 if (!prb_dispatch_next_block(pkc
, po
))
711 /* Case 1. Queue was frozen because user-space was
714 if (prb_curr_blk_in_use(pkc
, pbd
)) {
716 * Ok, user-space is still behind.
717 * So just refresh the timer.
721 /* Case 2. queue was frozen,user-space caught up,
722 * now the link went idle && the timer fired.
723 * We don't have a block to close.So we open this
724 * block and restart the timer.
725 * opening a block thaws the queue,restarts timer
726 * Thawing/timer-refresh is a side effect.
728 prb_open_block(pkc
, pbd
);
735 _prb_refresh_rx_retire_blk_timer(pkc
);
738 spin_unlock(&po
->sk
.sk_receive_queue
.lock
);
741 static void prb_flush_block(struct tpacket_kbdq_core
*pkc1
,
742 struct tpacket_block_desc
*pbd1
, __u32 status
)
744 /* Flush everything minus the block header */
746 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
751 /* Skip the block header(we know header WILL fit in 4K) */
754 end
= (u8
*)PAGE_ALIGN((unsigned long)pkc1
->pkblk_end
);
755 for (; start
< end
; start
+= PAGE_SIZE
)
756 flush_dcache_page(pgv_to_page(start
));
761 /* Now update the block status. */
763 BLOCK_STATUS(pbd1
) = status
;
765 /* Flush the block header */
767 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
769 flush_dcache_page(pgv_to_page(start
));
779 * 2) Increment active_blk_num
781 * Note:We DONT refresh the timer on purpose.
782 * Because almost always the next block will be opened.
784 static void prb_close_block(struct tpacket_kbdq_core
*pkc1
,
785 struct tpacket_block_desc
*pbd1
,
786 struct packet_sock
*po
, unsigned int stat
)
788 __u32 status
= TP_STATUS_USER
| stat
;
790 struct tpacket3_hdr
*last_pkt
;
791 struct tpacket_hdr_v1
*h1
= &pbd1
->hdr
.bh1
;
792 struct sock
*sk
= &po
->sk
;
794 if (po
->stats
.stats3
.tp_drops
)
795 status
|= TP_STATUS_LOSING
;
797 last_pkt
= (struct tpacket3_hdr
*)pkc1
->prev
;
798 last_pkt
->tp_next_offset
= 0;
800 /* Get the ts of the last pkt */
801 if (BLOCK_NUM_PKTS(pbd1
)) {
802 h1
->ts_last_pkt
.ts_sec
= last_pkt
->tp_sec
;
803 h1
->ts_last_pkt
.ts_nsec
= last_pkt
->tp_nsec
;
805 /* Ok, we tmo'd - so get the current time.
807 * It shouldn't really happen as we don't close empty
808 * blocks. See prb_retire_rx_blk_timer_expired().
812 h1
->ts_last_pkt
.ts_sec
= ts
.tv_sec
;
813 h1
->ts_last_pkt
.ts_nsec
= ts
.tv_nsec
;
818 /* Flush the block */
819 prb_flush_block(pkc1
, pbd1
, status
);
821 sk
->sk_data_ready(sk
);
823 pkc1
->kactive_blk_num
= GET_NEXT_PRB_BLK_NUM(pkc1
);
826 static void prb_thaw_queue(struct tpacket_kbdq_core
*pkc
)
828 pkc
->reset_pending_on_curr_blk
= 0;
832 * Side effect of opening a block:
834 * 1) prb_queue is thawed.
835 * 2) retire_blk_timer is refreshed.
838 static void prb_open_block(struct tpacket_kbdq_core
*pkc1
,
839 struct tpacket_block_desc
*pbd1
)
842 struct tpacket_hdr_v1
*h1
= &pbd1
->hdr
.bh1
;
846 /* We could have just memset this but we will lose the
847 * flexibility of making the priv area sticky
850 BLOCK_SNUM(pbd1
) = pkc1
->knxt_seq_num
++;
851 BLOCK_NUM_PKTS(pbd1
) = 0;
852 BLOCK_LEN(pbd1
) = BLK_PLUS_PRIV(pkc1
->blk_sizeof_priv
);
856 h1
->ts_first_pkt
.ts_sec
= ts
.tv_sec
;
857 h1
->ts_first_pkt
.ts_nsec
= ts
.tv_nsec
;
859 pkc1
->pkblk_start
= (char *)pbd1
;
860 pkc1
->nxt_offset
= pkc1
->pkblk_start
+ BLK_PLUS_PRIV(pkc1
->blk_sizeof_priv
);
862 BLOCK_O2FP(pbd1
) = (__u32
)BLK_PLUS_PRIV(pkc1
->blk_sizeof_priv
);
863 BLOCK_O2PRIV(pbd1
) = BLK_HDR_LEN
;
865 pbd1
->version
= pkc1
->version
;
866 pkc1
->prev
= pkc1
->nxt_offset
;
867 pkc1
->pkblk_end
= pkc1
->pkblk_start
+ pkc1
->kblk_size
;
869 prb_thaw_queue(pkc1
);
870 _prb_refresh_rx_retire_blk_timer(pkc1
);
876 * Queue freeze logic:
877 * 1) Assume tp_block_nr = 8 blocks.
878 * 2) At time 't0', user opens Rx ring.
879 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
880 * 4) user-space is either sleeping or processing block '0'.
881 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
882 * it will close block-7,loop around and try to fill block '0'.
884 * __packet_lookup_frame_in_block
885 * prb_retire_current_block()
886 * prb_dispatch_next_block()
887 * |->(BLOCK_STATUS == USER) evaluates to true
888 * 5.1) Since block-0 is currently in-use, we just freeze the queue.
889 * 6) Now there are two cases:
890 * 6.1) Link goes idle right after the queue is frozen.
891 * But remember, the last open_block() refreshed the timer.
892 * When this timer expires,it will refresh itself so that we can
893 * re-open block-0 in near future.
894 * 6.2) Link is busy and keeps on receiving packets. This is a simple
895 * case and __packet_lookup_frame_in_block will check if block-0
896 * is free and can now be re-used.
898 static void prb_freeze_queue(struct tpacket_kbdq_core
*pkc
,
899 struct packet_sock
*po
)
901 pkc
->reset_pending_on_curr_blk
= 1;
902 po
->stats
.stats3
.tp_freeze_q_cnt
++;
905 #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
908 * If the next block is free then we will dispatch it
909 * and return a good offset.
910 * Else, we will freeze the queue.
911 * So, caller must check the return value.
913 static void *prb_dispatch_next_block(struct tpacket_kbdq_core
*pkc
,
914 struct packet_sock
*po
)
916 struct tpacket_block_desc
*pbd
;
920 /* 1. Get current block num */
921 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
923 /* 2. If this block is currently in_use then freeze the queue */
924 if (TP_STATUS_USER
& BLOCK_STATUS(pbd
)) {
925 prb_freeze_queue(pkc
, po
);
931 * open this block and return the offset where the first packet
932 * needs to get stored.
934 prb_open_block(pkc
, pbd
);
935 return (void *)pkc
->nxt_offset
;
938 static void prb_retire_current_block(struct tpacket_kbdq_core
*pkc
,
939 struct packet_sock
*po
, unsigned int status
)
941 struct tpacket_block_desc
*pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
943 /* retire/close the current block */
944 if (likely(TP_STATUS_KERNEL
== BLOCK_STATUS(pbd
))) {
946 * Plug the case where copy_bits() is in progress on
947 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
948 * have space to copy the pkt in the current block and
949 * called prb_retire_current_block()
951 * We don't need to worry about the TMO case because
952 * the timer-handler already handled this case.
954 if (!(status
& TP_STATUS_BLK_TMO
)) {
955 while (atomic_read(&pkc
->blk_fill_in_prog
)) {
956 /* Waiting for skb_copy_bits to finish... */
960 prb_close_block(pkc
, pbd
, po
, status
);
965 static int prb_curr_blk_in_use(struct tpacket_kbdq_core
*pkc
,
966 struct tpacket_block_desc
*pbd
)
968 return TP_STATUS_USER
& BLOCK_STATUS(pbd
);
971 static int prb_queue_frozen(struct tpacket_kbdq_core
*pkc
)
973 return pkc
->reset_pending_on_curr_blk
;
976 static void prb_clear_blk_fill_status(struct packet_ring_buffer
*rb
)
978 struct tpacket_kbdq_core
*pkc
= GET_PBDQC_FROM_RB(rb
);
979 atomic_dec(&pkc
->blk_fill_in_prog
);
982 static void prb_fill_rxhash(struct tpacket_kbdq_core
*pkc
,
983 struct tpacket3_hdr
*ppd
)
985 ppd
->hv1
.tp_rxhash
= skb_get_hash(pkc
->skb
);
988 static void prb_clear_rxhash(struct tpacket_kbdq_core
*pkc
,
989 struct tpacket3_hdr
*ppd
)
991 ppd
->hv1
.tp_rxhash
= 0;
994 static void prb_fill_vlan_info(struct tpacket_kbdq_core
*pkc
,
995 struct tpacket3_hdr
*ppd
)
997 if (skb_vlan_tag_present(pkc
->skb
)) {
998 ppd
->hv1
.tp_vlan_tci
= skb_vlan_tag_get(pkc
->skb
);
999 ppd
->hv1
.tp_vlan_tpid
= ntohs(pkc
->skb
->vlan_proto
);
1000 ppd
->tp_status
= TP_STATUS_VLAN_VALID
| TP_STATUS_VLAN_TPID_VALID
;
1002 ppd
->hv1
.tp_vlan_tci
= 0;
1003 ppd
->hv1
.tp_vlan_tpid
= 0;
1004 ppd
->tp_status
= TP_STATUS_AVAILABLE
;
1008 static void prb_run_all_ft_ops(struct tpacket_kbdq_core
*pkc
,
1009 struct tpacket3_hdr
*ppd
)
1011 ppd
->hv1
.tp_padding
= 0;
1012 prb_fill_vlan_info(pkc
, ppd
);
1014 if (pkc
->feature_req_word
& TP_FT_REQ_FILL_RXHASH
)
1015 prb_fill_rxhash(pkc
, ppd
);
1017 prb_clear_rxhash(pkc
, ppd
);
1020 static void prb_fill_curr_block(char *curr
,
1021 struct tpacket_kbdq_core
*pkc
,
1022 struct tpacket_block_desc
*pbd
,
1025 struct tpacket3_hdr
*ppd
;
1027 ppd
= (struct tpacket3_hdr
*)curr
;
1028 ppd
->tp_next_offset
= TOTAL_PKT_LEN_INCL_ALIGN(len
);
1030 pkc
->nxt_offset
+= TOTAL_PKT_LEN_INCL_ALIGN(len
);
1031 BLOCK_LEN(pbd
) += TOTAL_PKT_LEN_INCL_ALIGN(len
);
1032 BLOCK_NUM_PKTS(pbd
) += 1;
1033 atomic_inc(&pkc
->blk_fill_in_prog
);
1034 prb_run_all_ft_ops(pkc
, ppd
);
1037 /* Assumes caller has the sk->rx_queue.lock */
1038 static void *__packet_lookup_frame_in_block(struct packet_sock
*po
,
1039 struct sk_buff
*skb
,
1044 struct tpacket_kbdq_core
*pkc
;
1045 struct tpacket_block_desc
*pbd
;
1048 pkc
= GET_PBDQC_FROM_RB(&po
->rx_ring
);
1049 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
1051 /* Queue is frozen when user space is lagging behind */
1052 if (prb_queue_frozen(pkc
)) {
1054 * Check if that last block which caused the queue to freeze,
1055 * is still in_use by user-space.
1057 if (prb_curr_blk_in_use(pkc
, pbd
)) {
1058 /* Can't record this packet */
1062 * Ok, the block was released by user-space.
1063 * Now let's open that block.
1064 * opening a block also thaws the queue.
1065 * Thawing is a side effect.
1067 prb_open_block(pkc
, pbd
);
1072 curr
= pkc
->nxt_offset
;
1074 end
= (char *)pbd
+ pkc
->kblk_size
;
1076 /* first try the current block */
1077 if (curr
+TOTAL_PKT_LEN_INCL_ALIGN(len
) < end
) {
1078 prb_fill_curr_block(curr
, pkc
, pbd
, len
);
1079 return (void *)curr
;
1082 /* Ok, close the current block */
1083 prb_retire_current_block(pkc
, po
, 0);
1085 /* Now, try to dispatch the next block */
1086 curr
= (char *)prb_dispatch_next_block(pkc
, po
);
1088 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
1089 prb_fill_curr_block(curr
, pkc
, pbd
, len
);
1090 return (void *)curr
;
1094 * No free blocks are available.user_space hasn't caught up yet.
1095 * Queue was just frozen and now this packet will get dropped.
1100 static void *packet_current_rx_frame(struct packet_sock
*po
,
1101 struct sk_buff
*skb
,
1102 int status
, unsigned int len
)
1105 switch (po
->tp_version
) {
1108 curr
= packet_lookup_frame(po
, &po
->rx_ring
,
1109 po
->rx_ring
.head
, status
);
1112 return __packet_lookup_frame_in_block(po
, skb
, status
, len
);
1114 WARN(1, "TPACKET version not supported\n");
1120 static void *prb_lookup_block(struct packet_sock
*po
,
1121 struct packet_ring_buffer
*rb
,
1125 struct tpacket_kbdq_core
*pkc
= GET_PBDQC_FROM_RB(rb
);
1126 struct tpacket_block_desc
*pbd
= GET_PBLOCK_DESC(pkc
, idx
);
1128 if (status
!= BLOCK_STATUS(pbd
))
1133 static int prb_previous_blk_num(struct packet_ring_buffer
*rb
)
1136 if (rb
->prb_bdqc
.kactive_blk_num
)
1137 prev
= rb
->prb_bdqc
.kactive_blk_num
-1;
1139 prev
= rb
->prb_bdqc
.knum_blocks
-1;
1143 /* Assumes caller has held the rx_queue.lock */
1144 static void *__prb_previous_block(struct packet_sock
*po
,
1145 struct packet_ring_buffer
*rb
,
1148 unsigned int previous
= prb_previous_blk_num(rb
);
1149 return prb_lookup_block(po
, rb
, previous
, status
);
1152 static void *packet_previous_rx_frame(struct packet_sock
*po
,
1153 struct packet_ring_buffer
*rb
,
1156 if (po
->tp_version
<= TPACKET_V2
)
1157 return packet_previous_frame(po
, rb
, status
);
1159 return __prb_previous_block(po
, rb
, status
);
1162 static void packet_increment_rx_head(struct packet_sock
*po
,
1163 struct packet_ring_buffer
*rb
)
1165 switch (po
->tp_version
) {
1168 return packet_increment_head(rb
);
1171 WARN(1, "TPACKET version not supported.\n");
1177 static void *packet_previous_frame(struct packet_sock
*po
,
1178 struct packet_ring_buffer
*rb
,
1181 unsigned int previous
= rb
->head
? rb
->head
- 1 : rb
->frame_max
;
1182 return packet_lookup_frame(po
, rb
, previous
, status
);
1185 static void packet_increment_head(struct packet_ring_buffer
*buff
)
1187 buff
->head
= buff
->head
!= buff
->frame_max
? buff
->head
+1 : 0;
1190 static void packet_inc_pending(struct packet_ring_buffer
*rb
)
1192 this_cpu_inc(*rb
->pending_refcnt
);
1195 static void packet_dec_pending(struct packet_ring_buffer
*rb
)
1197 this_cpu_dec(*rb
->pending_refcnt
);
1200 static unsigned int packet_read_pending(const struct packet_ring_buffer
*rb
)
1202 unsigned int refcnt
= 0;
1205 /* We don't use pending refcount in rx_ring. */
1206 if (rb
->pending_refcnt
== NULL
)
1209 for_each_possible_cpu(cpu
)
1210 refcnt
+= *per_cpu_ptr(rb
->pending_refcnt
, cpu
);
1215 static int packet_alloc_pending(struct packet_sock
*po
)
1217 po
->rx_ring
.pending_refcnt
= NULL
;
1219 po
->tx_ring
.pending_refcnt
= alloc_percpu(unsigned int);
1220 if (unlikely(po
->tx_ring
.pending_refcnt
== NULL
))
1226 static void packet_free_pending(struct packet_sock
*po
)
1228 free_percpu(po
->tx_ring
.pending_refcnt
);
1231 #define ROOM_POW_OFF 2
1232 #define ROOM_NONE 0x0
1233 #define ROOM_LOW 0x1
1234 #define ROOM_NORMAL 0x2
1236 static bool __tpacket_has_room(struct packet_sock
*po
, int pow_off
)
1240 len
= po
->rx_ring
.frame_max
+ 1;
1241 idx
= po
->rx_ring
.head
;
1243 idx
+= len
>> pow_off
;
1246 return packet_lookup_frame(po
, &po
->rx_ring
, idx
, TP_STATUS_KERNEL
);
1249 static bool __tpacket_v3_has_room(struct packet_sock
*po
, int pow_off
)
1253 len
= po
->rx_ring
.prb_bdqc
.knum_blocks
;
1254 idx
= po
->rx_ring
.prb_bdqc
.kactive_blk_num
;
1256 idx
+= len
>> pow_off
;
1259 return prb_lookup_block(po
, &po
->rx_ring
, idx
, TP_STATUS_KERNEL
);
1262 static int __packet_rcv_has_room(struct packet_sock
*po
, struct sk_buff
*skb
)
1264 struct sock
*sk
= &po
->sk
;
1265 int ret
= ROOM_NONE
;
1267 if (po
->prot_hook
.func
!= tpacket_rcv
) {
1268 int avail
= sk
->sk_rcvbuf
- atomic_read(&sk
->sk_rmem_alloc
)
1269 - (skb
? skb
->truesize
: 0);
1270 if (avail
> (sk
->sk_rcvbuf
>> ROOM_POW_OFF
))
1278 if (po
->tp_version
== TPACKET_V3
) {
1279 if (__tpacket_v3_has_room(po
, ROOM_POW_OFF
))
1281 else if (__tpacket_v3_has_room(po
, 0))
1284 if (__tpacket_has_room(po
, ROOM_POW_OFF
))
1286 else if (__tpacket_has_room(po
, 0))
1293 static int packet_rcv_has_room(struct packet_sock
*po
, struct sk_buff
*skb
)
1298 spin_lock_bh(&po
->sk
.sk_receive_queue
.lock
);
1299 ret
= __packet_rcv_has_room(po
, skb
);
1300 has_room
= ret
== ROOM_NORMAL
;
1301 if (po
->pressure
== has_room
)
1302 po
->pressure
= !has_room
;
1303 spin_unlock_bh(&po
->sk
.sk_receive_queue
.lock
);
1308 static void packet_sock_destruct(struct sock
*sk
)
1310 skb_queue_purge(&sk
->sk_error_queue
);
1312 WARN_ON(atomic_read(&sk
->sk_rmem_alloc
));
1313 WARN_ON(atomic_read(&sk
->sk_wmem_alloc
));
1315 if (!sock_flag(sk
, SOCK_DEAD
)) {
1316 pr_err("Attempt to release alive packet socket: %p\n", sk
);
1320 sk_refcnt_debug_dec(sk
);
1323 static bool fanout_flow_is_huge(struct packet_sock
*po
, struct sk_buff
*skb
)
1328 rxhash
= skb_get_hash(skb
);
1329 for (i
= 0; i
< ROLLOVER_HLEN
; i
++)
1330 if (po
->rollover
->history
[i
] == rxhash
)
1333 po
->rollover
->history
[prandom_u32() % ROLLOVER_HLEN
] = rxhash
;
1334 return count
> (ROLLOVER_HLEN
>> 1);
1337 static unsigned int fanout_demux_hash(struct packet_fanout
*f
,
1338 struct sk_buff
*skb
,
1341 return reciprocal_scale(skb_get_hash(skb
), num
);
1344 static unsigned int fanout_demux_lb(struct packet_fanout
*f
,
1345 struct sk_buff
*skb
,
1348 unsigned int val
= atomic_inc_return(&f
->rr_cur
);
1353 static unsigned int fanout_demux_cpu(struct packet_fanout
*f
,
1354 struct sk_buff
*skb
,
1357 return smp_processor_id() % num
;
1360 static unsigned int fanout_demux_rnd(struct packet_fanout
*f
,
1361 struct sk_buff
*skb
,
1364 return prandom_u32_max(num
);
1367 static unsigned int fanout_demux_rollover(struct packet_fanout
*f
,
1368 struct sk_buff
*skb
,
1369 unsigned int idx
, bool try_self
,
1372 struct packet_sock
*po
, *po_next
, *po_skip
= NULL
;
1373 unsigned int i
, j
, room
= ROOM_NONE
;
1375 po
= pkt_sk(f
->arr
[idx
]);
1378 room
= packet_rcv_has_room(po
, skb
);
1379 if (room
== ROOM_NORMAL
||
1380 (room
== ROOM_LOW
&& !fanout_flow_is_huge(po
, skb
)))
1385 i
= j
= min_t(int, po
->rollover
->sock
, num
- 1);
1387 po_next
= pkt_sk(f
->arr
[i
]);
1388 if (po_next
!= po_skip
&& !po_next
->pressure
&&
1389 packet_rcv_has_room(po_next
, skb
) == ROOM_NORMAL
) {
1391 po
->rollover
->sock
= i
;
1392 atomic_long_inc(&po
->rollover
->num
);
1393 if (room
== ROOM_LOW
)
1394 atomic_long_inc(&po
->rollover
->num_huge
);
1402 atomic_long_inc(&po
->rollover
->num_failed
);
1406 static unsigned int fanout_demux_qm(struct packet_fanout
*f
,
1407 struct sk_buff
*skb
,
1410 return skb_get_queue_mapping(skb
) % num
;
1413 static bool fanout_has_flag(struct packet_fanout
*f
, u16 flag
)
1415 return f
->flags
& (flag
>> 8);
1418 static int packet_rcv_fanout(struct sk_buff
*skb
, struct net_device
*dev
,
1419 struct packet_type
*pt
, struct net_device
*orig_dev
)
1421 struct packet_fanout
*f
= pt
->af_packet_priv
;
1422 unsigned int num
= READ_ONCE(f
->num_members
);
1423 struct packet_sock
*po
;
1426 if (!net_eq(dev_net(dev
), read_pnet(&f
->net
)) ||
1432 if (fanout_has_flag(f
, PACKET_FANOUT_FLAG_DEFRAG
)) {
1433 skb
= ip_check_defrag(skb
, IP_DEFRAG_AF_PACKET
);
1438 case PACKET_FANOUT_HASH
:
1440 idx
= fanout_demux_hash(f
, skb
, num
);
1442 case PACKET_FANOUT_LB
:
1443 idx
= fanout_demux_lb(f
, skb
, num
);
1445 case PACKET_FANOUT_CPU
:
1446 idx
= fanout_demux_cpu(f
, skb
, num
);
1448 case PACKET_FANOUT_RND
:
1449 idx
= fanout_demux_rnd(f
, skb
, num
);
1451 case PACKET_FANOUT_QM
:
1452 idx
= fanout_demux_qm(f
, skb
, num
);
1454 case PACKET_FANOUT_ROLLOVER
:
1455 idx
= fanout_demux_rollover(f
, skb
, 0, false, num
);
1459 if (fanout_has_flag(f
, PACKET_FANOUT_FLAG_ROLLOVER
))
1460 idx
= fanout_demux_rollover(f
, skb
, idx
, true, num
);
1462 po
= pkt_sk(f
->arr
[idx
]);
1463 return po
->prot_hook
.func(skb
, dev
, &po
->prot_hook
, orig_dev
);
1466 DEFINE_MUTEX(fanout_mutex
);
1467 EXPORT_SYMBOL_GPL(fanout_mutex
);
1468 static LIST_HEAD(fanout_list
);
1470 static void __fanout_link(struct sock
*sk
, struct packet_sock
*po
)
1472 struct packet_fanout
*f
= po
->fanout
;
1474 spin_lock(&f
->lock
);
1475 f
->arr
[f
->num_members
] = sk
;
1478 spin_unlock(&f
->lock
);
1481 static void __fanout_unlink(struct sock
*sk
, struct packet_sock
*po
)
1483 struct packet_fanout
*f
= po
->fanout
;
1486 spin_lock(&f
->lock
);
1487 for (i
= 0; i
< f
->num_members
; i
++) {
1488 if (f
->arr
[i
] == sk
)
1491 BUG_ON(i
>= f
->num_members
);
1492 f
->arr
[i
] = f
->arr
[f
->num_members
- 1];
1494 spin_unlock(&f
->lock
);
1497 static bool match_fanout_group(struct packet_type
*ptype
, struct sock
*sk
)
1499 if (ptype
->af_packet_priv
== (void *)((struct packet_sock
*)sk
)->fanout
)
1505 static int fanout_add(struct sock
*sk
, u16 id
, u16 type_flags
)
1507 struct packet_sock
*po
= pkt_sk(sk
);
1508 struct packet_fanout
*f
, *match
;
1509 u8 type
= type_flags
& 0xff;
1510 u8 flags
= type_flags
>> 8;
1514 case PACKET_FANOUT_ROLLOVER
:
1515 if (type_flags
& PACKET_FANOUT_FLAG_ROLLOVER
)
1517 case PACKET_FANOUT_HASH
:
1518 case PACKET_FANOUT_LB
:
1519 case PACKET_FANOUT_CPU
:
1520 case PACKET_FANOUT_RND
:
1521 case PACKET_FANOUT_QM
:
1533 if (type
== PACKET_FANOUT_ROLLOVER
||
1534 (type_flags
& PACKET_FANOUT_FLAG_ROLLOVER
)) {
1535 po
->rollover
= kzalloc(sizeof(*po
->rollover
), GFP_KERNEL
);
1538 atomic_long_set(&po
->rollover
->num
, 0);
1539 atomic_long_set(&po
->rollover
->num_huge
, 0);
1540 atomic_long_set(&po
->rollover
->num_failed
, 0);
1543 mutex_lock(&fanout_mutex
);
1545 list_for_each_entry(f
, &fanout_list
, list
) {
1547 read_pnet(&f
->net
) == sock_net(sk
)) {
1553 if (match
&& match
->flags
!= flags
)
1557 match
= kzalloc(sizeof(*match
), GFP_KERNEL
);
1560 write_pnet(&match
->net
, sock_net(sk
));
1563 match
->flags
= flags
;
1564 atomic_set(&match
->rr_cur
, 0);
1565 INIT_LIST_HEAD(&match
->list
);
1566 spin_lock_init(&match
->lock
);
1567 atomic_set(&match
->sk_ref
, 0);
1568 match
->prot_hook
.type
= po
->prot_hook
.type
;
1569 match
->prot_hook
.dev
= po
->prot_hook
.dev
;
1570 match
->prot_hook
.func
= packet_rcv_fanout
;
1571 match
->prot_hook
.af_packet_priv
= match
;
1572 match
->prot_hook
.id_match
= match_fanout_group
;
1573 dev_add_pack(&match
->prot_hook
);
1574 list_add(&match
->list
, &fanout_list
);
1577 if (match
->type
== type
&&
1578 match
->prot_hook
.type
== po
->prot_hook
.type
&&
1579 match
->prot_hook
.dev
== po
->prot_hook
.dev
) {
1581 if (atomic_read(&match
->sk_ref
) < PACKET_FANOUT_MAX
) {
1582 __dev_remove_pack(&po
->prot_hook
);
1584 atomic_inc(&match
->sk_ref
);
1585 __fanout_link(sk
, po
);
1590 mutex_unlock(&fanout_mutex
);
1592 kfree(po
->rollover
);
1593 po
->rollover
= NULL
;
1598 static void fanout_release(struct sock
*sk
)
1600 struct packet_sock
*po
= pkt_sk(sk
);
1601 struct packet_fanout
*f
;
1607 mutex_lock(&fanout_mutex
);
1610 if (atomic_dec_and_test(&f
->sk_ref
)) {
1612 dev_remove_pack(&f
->prot_hook
);
1615 mutex_unlock(&fanout_mutex
);
1618 kfree_rcu(po
->rollover
, rcu
);
1621 static const struct proto_ops packet_ops
;
1623 static const struct proto_ops packet_ops_spkt
;
1625 static int packet_rcv_spkt(struct sk_buff
*skb
, struct net_device
*dev
,
1626 struct packet_type
*pt
, struct net_device
*orig_dev
)
1629 struct sockaddr_pkt
*spkt
;
1632 * When we registered the protocol we saved the socket in the data
1633 * field for just this event.
1636 sk
= pt
->af_packet_priv
;
1639 * Yank back the headers [hope the device set this
1640 * right or kerboom...]
1642 * Incoming packets have ll header pulled,
1645 * For outgoing ones skb->data == skb_mac_header(skb)
1646 * so that this procedure is noop.
1649 if (skb
->pkt_type
== PACKET_LOOPBACK
)
1652 if (!net_eq(dev_net(dev
), sock_net(sk
)))
1655 skb
= skb_share_check(skb
, GFP_ATOMIC
);
1659 /* drop any routing info */
1662 /* drop conntrack reference */
1665 spkt
= &PACKET_SKB_CB(skb
)->sa
.pkt
;
1667 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
1670 * The SOCK_PACKET socket receives _all_ frames.
1673 spkt
->spkt_family
= dev
->type
;
1674 strlcpy(spkt
->spkt_device
, dev
->name
, sizeof(spkt
->spkt_device
));
1675 spkt
->spkt_protocol
= skb
->protocol
;
1678 * Charge the memory to the socket. This is done specifically
1679 * to prevent sockets using all the memory up.
1682 if (sock_queue_rcv_skb(sk
, skb
) == 0)
1693 * Output a raw packet to a device layer. This bypasses all the other
1694 * protocol layers and you must therefore supply it with a complete frame
1697 static int packet_sendmsg_spkt(struct socket
*sock
, struct msghdr
*msg
,
1700 struct sock
*sk
= sock
->sk
;
1701 DECLARE_SOCKADDR(struct sockaddr_pkt
*, saddr
, msg
->msg_name
);
1702 struct sk_buff
*skb
= NULL
;
1703 struct net_device
*dev
;
1709 * Get and verify the address.
1713 if (msg
->msg_namelen
< sizeof(struct sockaddr
))
1715 if (msg
->msg_namelen
== sizeof(struct sockaddr_pkt
))
1716 proto
= saddr
->spkt_protocol
;
1718 return -ENOTCONN
; /* SOCK_PACKET must be sent giving an address */
1721 * Find the device first to size check it
1724 saddr
->spkt_device
[sizeof(saddr
->spkt_device
) - 1] = 0;
1727 dev
= dev_get_by_name_rcu(sock_net(sk
), saddr
->spkt_device
);
1733 if (!(dev
->flags
& IFF_UP
))
1737 * You may not queue a frame bigger than the mtu. This is the lowest level
1738 * raw protocol and you must do your own fragmentation at this level.
1741 if (unlikely(sock_flag(sk
, SOCK_NOFCS
))) {
1742 if (!netif_supports_nofcs(dev
)) {
1743 err
= -EPROTONOSUPPORT
;
1746 extra_len
= 4; /* We're doing our own CRC */
1750 if (len
> dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
+ extra_len
)
1754 size_t reserved
= LL_RESERVED_SPACE(dev
);
1755 int tlen
= dev
->needed_tailroom
;
1756 unsigned int hhlen
= dev
->header_ops
? dev
->hard_header_len
: 0;
1759 skb
= sock_wmalloc(sk
, len
+ reserved
+ tlen
, 0, GFP_KERNEL
);
1762 /* FIXME: Save some space for broken drivers that write a hard
1763 * header at transmission time by themselves. PPP is the notable
1764 * one here. This should really be fixed at the driver level.
1766 skb_reserve(skb
, reserved
);
1767 skb_reset_network_header(skb
);
1769 /* Try to align data part correctly */
1774 skb_reset_network_header(skb
);
1776 err
= memcpy_from_msg(skb_put(skb
, len
), msg
, len
);
1782 if (len
> (dev
->mtu
+ dev
->hard_header_len
+ extra_len
)) {
1783 /* Earlier code assumed this would be a VLAN pkt,
1784 * double-check this now that we have the actual
1787 struct ethhdr
*ehdr
;
1788 skb_reset_mac_header(skb
);
1789 ehdr
= eth_hdr(skb
);
1790 if (ehdr
->h_proto
!= htons(ETH_P_8021Q
)) {
1796 skb
->protocol
= proto
;
1798 skb
->priority
= sk
->sk_priority
;
1799 skb
->mark
= sk
->sk_mark
;
1801 sock_tx_timestamp(sk
, &skb_shinfo(skb
)->tx_flags
);
1803 if (unlikely(extra_len
== 4))
1806 skb_probe_transport_header(skb
, 0);
1808 dev_queue_xmit(skb
);
1819 static unsigned int run_filter(const struct sk_buff
*skb
,
1820 const struct sock
*sk
,
1823 struct sk_filter
*filter
;
1826 filter
= rcu_dereference(sk
->sk_filter
);
1828 res
= SK_RUN_FILTER(filter
, skb
);
1835 * This function makes lazy skb cloning in hope that most of packets
1836 * are discarded by BPF.
1838 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
1839 * and skb->cb are mangled. It works because (and until) packets
1840 * falling here are owned by current CPU. Output packets are cloned
1841 * by dev_queue_xmit_nit(), input packets are processed by net_bh
1842 * sequencially, so that if we return skb to original state on exit,
1843 * we will not harm anyone.
1846 static int packet_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
1847 struct packet_type
*pt
, struct net_device
*orig_dev
)
1850 struct sockaddr_ll
*sll
;
1851 struct packet_sock
*po
;
1852 u8
*skb_head
= skb
->data
;
1853 int skb_len
= skb
->len
;
1854 unsigned int snaplen
, res
;
1856 if (skb
->pkt_type
== PACKET_LOOPBACK
)
1859 sk
= pt
->af_packet_priv
;
1862 if (!net_eq(dev_net(dev
), sock_net(sk
)))
1867 if (dev
->header_ops
) {
1868 /* The device has an explicit notion of ll header,
1869 * exported to higher levels.
1871 * Otherwise, the device hides details of its frame
1872 * structure, so that corresponding packet head is
1873 * never delivered to user.
1875 if (sk
->sk_type
!= SOCK_DGRAM
)
1876 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
1877 else if (skb
->pkt_type
== PACKET_OUTGOING
) {
1878 /* Special case: outgoing packets have ll header at head */
1879 skb_pull(skb
, skb_network_offset(skb
));
1885 res
= run_filter(skb
, sk
, snaplen
);
1887 goto drop_n_restore
;
1891 if (atomic_read(&sk
->sk_rmem_alloc
) >= sk
->sk_rcvbuf
)
1894 if (skb_shared(skb
)) {
1895 struct sk_buff
*nskb
= skb_clone(skb
, GFP_ATOMIC
);
1899 if (skb_head
!= skb
->data
) {
1900 skb
->data
= skb_head
;
1907 sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb
)) + MAX_ADDR_LEN
- 8);
1909 sll
= &PACKET_SKB_CB(skb
)->sa
.ll
;
1910 sll
->sll_hatype
= dev
->type
;
1911 sll
->sll_pkttype
= skb
->pkt_type
;
1912 if (unlikely(po
->origdev
))
1913 sll
->sll_ifindex
= orig_dev
->ifindex
;
1915 sll
->sll_ifindex
= dev
->ifindex
;
1917 sll
->sll_halen
= dev_parse_header(skb
, sll
->sll_addr
);
1919 /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg().
1920 * Use their space for storing the original skb length.
1922 PACKET_SKB_CB(skb
)->sa
.origlen
= skb
->len
;
1924 if (pskb_trim(skb
, snaplen
))
1927 skb_set_owner_r(skb
, sk
);
1931 /* drop conntrack reference */
1934 spin_lock(&sk
->sk_receive_queue
.lock
);
1935 po
->stats
.stats1
.tp_packets
++;
1936 sock_skb_set_dropcount(sk
, skb
);
1937 __skb_queue_tail(&sk
->sk_receive_queue
, skb
);
1938 spin_unlock(&sk
->sk_receive_queue
.lock
);
1939 sk
->sk_data_ready(sk
);
1943 spin_lock(&sk
->sk_receive_queue
.lock
);
1944 po
->stats
.stats1
.tp_drops
++;
1945 atomic_inc(&sk
->sk_drops
);
1946 spin_unlock(&sk
->sk_receive_queue
.lock
);
1949 if (skb_head
!= skb
->data
&& skb_shared(skb
)) {
1950 skb
->data
= skb_head
;
1958 static int tpacket_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
1959 struct packet_type
*pt
, struct net_device
*orig_dev
)
1962 struct packet_sock
*po
;
1963 struct sockaddr_ll
*sll
;
1964 union tpacket_uhdr h
;
1965 u8
*skb_head
= skb
->data
;
1966 int skb_len
= skb
->len
;
1967 unsigned int snaplen
, res
;
1968 unsigned long status
= TP_STATUS_USER
;
1969 unsigned short macoff
, netoff
, hdrlen
;
1970 struct sk_buff
*copy_skb
= NULL
;
1974 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
1975 * We may add members to them until current aligned size without forcing
1976 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
1978 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h
.h2
)) != 32);
1979 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h
.h3
)) != 48);
1981 if (skb
->pkt_type
== PACKET_LOOPBACK
)
1984 sk
= pt
->af_packet_priv
;
1987 if (!net_eq(dev_net(dev
), sock_net(sk
)))
1990 if (dev
->header_ops
) {
1991 if (sk
->sk_type
!= SOCK_DGRAM
)
1992 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
1993 else if (skb
->pkt_type
== PACKET_OUTGOING
) {
1994 /* Special case: outgoing packets have ll header at head */
1995 skb_pull(skb
, skb_network_offset(skb
));
2001 res
= run_filter(skb
, sk
, snaplen
);
2003 goto drop_n_restore
;
2005 if (skb
->ip_summed
== CHECKSUM_PARTIAL
)
2006 status
|= TP_STATUS_CSUMNOTREADY
;
2007 else if (skb
->pkt_type
!= PACKET_OUTGOING
&&
2008 (skb
->ip_summed
== CHECKSUM_COMPLETE
||
2009 skb_csum_unnecessary(skb
)))
2010 status
|= TP_STATUS_CSUM_VALID
;
2015 if (sk
->sk_type
== SOCK_DGRAM
) {
2016 macoff
= netoff
= TPACKET_ALIGN(po
->tp_hdrlen
) + 16 +
2019 unsigned int maclen
= skb_network_offset(skb
);
2020 netoff
= TPACKET_ALIGN(po
->tp_hdrlen
+
2021 (maclen
< 16 ? 16 : maclen
)) +
2023 macoff
= netoff
- maclen
;
2025 if (po
->tp_version
<= TPACKET_V2
) {
2026 if (macoff
+ snaplen
> po
->rx_ring
.frame_size
) {
2027 if (po
->copy_thresh
&&
2028 atomic_read(&sk
->sk_rmem_alloc
) < sk
->sk_rcvbuf
) {
2029 if (skb_shared(skb
)) {
2030 copy_skb
= skb_clone(skb
, GFP_ATOMIC
);
2032 copy_skb
= skb_get(skb
);
2033 skb_head
= skb
->data
;
2036 skb_set_owner_r(copy_skb
, sk
);
2038 snaplen
= po
->rx_ring
.frame_size
- macoff
;
2039 if ((int)snaplen
< 0)
2042 } else if (unlikely(macoff
+ snaplen
>
2043 GET_PBDQC_FROM_RB(&po
->rx_ring
)->max_frame_len
)) {
2046 nval
= GET_PBDQC_FROM_RB(&po
->rx_ring
)->max_frame_len
- macoff
;
2047 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
2048 snaplen
, nval
, macoff
);
2050 if (unlikely((int)snaplen
< 0)) {
2052 macoff
= GET_PBDQC_FROM_RB(&po
->rx_ring
)->max_frame_len
;
2055 spin_lock(&sk
->sk_receive_queue
.lock
);
2056 h
.raw
= packet_current_rx_frame(po
, skb
,
2057 TP_STATUS_KERNEL
, (macoff
+snaplen
));
2060 if (po
->tp_version
<= TPACKET_V2
) {
2061 packet_increment_rx_head(po
, &po
->rx_ring
);
2063 * LOSING will be reported till you read the stats,
2064 * because it's COR - Clear On Read.
2065 * Anyways, moving it for V1/V2 only as V3 doesn't need this
2068 if (po
->stats
.stats1
.tp_drops
)
2069 status
|= TP_STATUS_LOSING
;
2071 po
->stats
.stats1
.tp_packets
++;
2073 status
|= TP_STATUS_COPY
;
2074 __skb_queue_tail(&sk
->sk_receive_queue
, copy_skb
);
2076 spin_unlock(&sk
->sk_receive_queue
.lock
);
2078 skb_copy_bits(skb
, 0, h
.raw
+ macoff
, snaplen
);
2080 if (!(ts_status
= tpacket_get_timestamp(skb
, &ts
, po
->tp_tstamp
)))
2081 getnstimeofday(&ts
);
2083 status
|= ts_status
;
2085 switch (po
->tp_version
) {
2087 h
.h1
->tp_len
= skb
->len
;
2088 h
.h1
->tp_snaplen
= snaplen
;
2089 h
.h1
->tp_mac
= macoff
;
2090 h
.h1
->tp_net
= netoff
;
2091 h
.h1
->tp_sec
= ts
.tv_sec
;
2092 h
.h1
->tp_usec
= ts
.tv_nsec
/ NSEC_PER_USEC
;
2093 hdrlen
= sizeof(*h
.h1
);
2096 h
.h2
->tp_len
= skb
->len
;
2097 h
.h2
->tp_snaplen
= snaplen
;
2098 h
.h2
->tp_mac
= macoff
;
2099 h
.h2
->tp_net
= netoff
;
2100 h
.h2
->tp_sec
= ts
.tv_sec
;
2101 h
.h2
->tp_nsec
= ts
.tv_nsec
;
2102 if (skb_vlan_tag_present(skb
)) {
2103 h
.h2
->tp_vlan_tci
= skb_vlan_tag_get(skb
);
2104 h
.h2
->tp_vlan_tpid
= ntohs(skb
->vlan_proto
);
2105 status
|= TP_STATUS_VLAN_VALID
| TP_STATUS_VLAN_TPID_VALID
;
2107 h
.h2
->tp_vlan_tci
= 0;
2108 h
.h2
->tp_vlan_tpid
= 0;
2110 memset(h
.h2
->tp_padding
, 0, sizeof(h
.h2
->tp_padding
));
2111 hdrlen
= sizeof(*h
.h2
);
2114 /* tp_nxt_offset,vlan are already populated above.
2115 * So DONT clear those fields here
2117 h
.h3
->tp_status
|= status
;
2118 h
.h3
->tp_len
= skb
->len
;
2119 h
.h3
->tp_snaplen
= snaplen
;
2120 h
.h3
->tp_mac
= macoff
;
2121 h
.h3
->tp_net
= netoff
;
2122 h
.h3
->tp_sec
= ts
.tv_sec
;
2123 h
.h3
->tp_nsec
= ts
.tv_nsec
;
2124 memset(h
.h3
->tp_padding
, 0, sizeof(h
.h3
->tp_padding
));
2125 hdrlen
= sizeof(*h
.h3
);
2131 sll
= h
.raw
+ TPACKET_ALIGN(hdrlen
);
2132 sll
->sll_halen
= dev_parse_header(skb
, sll
->sll_addr
);
2133 sll
->sll_family
= AF_PACKET
;
2134 sll
->sll_hatype
= dev
->type
;
2135 sll
->sll_protocol
= skb
->protocol
;
2136 sll
->sll_pkttype
= skb
->pkt_type
;
2137 if (unlikely(po
->origdev
))
2138 sll
->sll_ifindex
= orig_dev
->ifindex
;
2140 sll
->sll_ifindex
= dev
->ifindex
;
2144 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
2145 if (po
->tp_version
<= TPACKET_V2
) {
2148 end
= (u8
*) PAGE_ALIGN((unsigned long) h
.raw
+
2151 for (start
= h
.raw
; start
< end
; start
+= PAGE_SIZE
)
2152 flush_dcache_page(pgv_to_page(start
));
2157 if (po
->tp_version
<= TPACKET_V2
) {
2158 __packet_set_status(po
, h
.raw
, status
);
2159 sk
->sk_data_ready(sk
);
2161 prb_clear_blk_fill_status(&po
->rx_ring
);
2165 if (skb_head
!= skb
->data
&& skb_shared(skb
)) {
2166 skb
->data
= skb_head
;
2174 po
->stats
.stats1
.tp_drops
++;
2175 spin_unlock(&sk
->sk_receive_queue
.lock
);
2177 sk
->sk_data_ready(sk
);
2178 kfree_skb(copy_skb
);
2179 goto drop_n_restore
;
2182 static void tpacket_destruct_skb(struct sk_buff
*skb
)
2184 struct packet_sock
*po
= pkt_sk(skb
->sk
);
2186 if (likely(po
->tx_ring
.pg_vec
)) {
2190 ph
= skb_shinfo(skb
)->destructor_arg
;
2191 packet_dec_pending(&po
->tx_ring
);
2193 ts
= __packet_set_timestamp(po
, ph
, skb
);
2194 __packet_set_status(po
, ph
, TP_STATUS_AVAILABLE
| ts
);
2200 static bool ll_header_truncated(const struct net_device
*dev
, int len
)
2202 /* net device doesn't like empty head */
2203 if (unlikely(len
<= dev
->hard_header_len
)) {
2204 net_warn_ratelimited("%s: packet size is too short (%d <= %d)\n",
2205 current
->comm
, len
, dev
->hard_header_len
);
2212 static int tpacket_fill_skb(struct packet_sock
*po
, struct sk_buff
*skb
,
2213 void *frame
, struct net_device
*dev
, int size_max
,
2214 __be16 proto
, unsigned char *addr
, int hlen
)
2216 union tpacket_uhdr ph
;
2217 int to_write
, offset
, len
, tp_len
, nr_frags
, len_max
;
2218 struct socket
*sock
= po
->sk
.sk_socket
;
2225 skb
->protocol
= proto
;
2227 skb
->priority
= po
->sk
.sk_priority
;
2228 skb
->mark
= po
->sk
.sk_mark
;
2229 sock_tx_timestamp(&po
->sk
, &skb_shinfo(skb
)->tx_flags
);
2230 skb_shinfo(skb
)->destructor_arg
= ph
.raw
;
2232 switch (po
->tp_version
) {
2234 tp_len
= ph
.h2
->tp_len
;
2237 tp_len
= ph
.h1
->tp_len
;
2240 if (unlikely(tp_len
> size_max
)) {
2241 pr_err("packet size is too long (%d > %d)\n", tp_len
, size_max
);
2245 skb_reserve(skb
, hlen
);
2246 skb_reset_network_header(skb
);
2248 if (!packet_use_direct_xmit(po
))
2249 skb_probe_transport_header(skb
, 0);
2250 if (unlikely(po
->tp_tx_has_off
)) {
2251 int off_min
, off_max
, off
;
2252 off_min
= po
->tp_hdrlen
- sizeof(struct sockaddr_ll
);
2253 off_max
= po
->tx_ring
.frame_size
- tp_len
;
2254 if (sock
->type
== SOCK_DGRAM
) {
2255 switch (po
->tp_version
) {
2257 off
= ph
.h2
->tp_net
;
2260 off
= ph
.h1
->tp_net
;
2264 switch (po
->tp_version
) {
2266 off
= ph
.h2
->tp_mac
;
2269 off
= ph
.h1
->tp_mac
;
2273 if (unlikely((off
< off_min
) || (off_max
< off
)))
2275 data
= ph
.raw
+ off
;
2277 data
= ph
.raw
+ po
->tp_hdrlen
- sizeof(struct sockaddr_ll
);
2281 if (sock
->type
== SOCK_DGRAM
) {
2282 err
= dev_hard_header(skb
, dev
, ntohs(proto
), addr
,
2284 if (unlikely(err
< 0))
2286 } else if (dev
->hard_header_len
) {
2287 if (ll_header_truncated(dev
, tp_len
))
2290 skb_push(skb
, dev
->hard_header_len
);
2291 err
= skb_store_bits(skb
, 0, data
,
2292 dev
->hard_header_len
);
2296 data
+= dev
->hard_header_len
;
2297 to_write
-= dev
->hard_header_len
;
2300 offset
= offset_in_page(data
);
2301 len_max
= PAGE_SIZE
- offset
;
2302 len
= ((to_write
> len_max
) ? len_max
: to_write
);
2304 skb
->data_len
= to_write
;
2305 skb
->len
+= to_write
;
2306 skb
->truesize
+= to_write
;
2307 atomic_add(to_write
, &po
->sk
.sk_wmem_alloc
);
2309 while (likely(to_write
)) {
2310 nr_frags
= skb_shinfo(skb
)->nr_frags
;
2312 if (unlikely(nr_frags
>= MAX_SKB_FRAGS
)) {
2313 pr_err("Packet exceed the number of skb frags(%lu)\n",
2318 page
= pgv_to_page(data
);
2320 flush_dcache_page(page
);
2322 skb_fill_page_desc(skb
, nr_frags
, page
, offset
, len
);
2325 len_max
= PAGE_SIZE
;
2326 len
= ((to_write
> len_max
) ? len_max
: to_write
);
2332 static int tpacket_snd(struct packet_sock
*po
, struct msghdr
*msg
)
2334 struct sk_buff
*skb
;
2335 struct net_device
*dev
;
2337 int err
, reserve
= 0;
2339 DECLARE_SOCKADDR(struct sockaddr_ll
*, saddr
, msg
->msg_name
);
2340 bool need_wait
= !(msg
->msg_flags
& MSG_DONTWAIT
);
2341 int tp_len
, size_max
;
2342 unsigned char *addr
;
2344 int status
= TP_STATUS_AVAILABLE
;
2347 mutex_lock(&po
->pg_vec_lock
);
2349 if (likely(saddr
== NULL
)) {
2350 dev
= packet_cached_dev_get(po
);
2355 if (msg
->msg_namelen
< sizeof(struct sockaddr_ll
))
2357 if (msg
->msg_namelen
< (saddr
->sll_halen
2358 + offsetof(struct sockaddr_ll
,
2361 proto
= saddr
->sll_protocol
;
2362 addr
= saddr
->sll_addr
;
2363 dev
= dev_get_by_index(sock_net(&po
->sk
), saddr
->sll_ifindex
);
2367 if (unlikely(dev
== NULL
))
2370 if (unlikely(!(dev
->flags
& IFF_UP
)))
2373 reserve
= dev
->hard_header_len
+ VLAN_HLEN
;
2374 size_max
= po
->tx_ring
.frame_size
2375 - (po
->tp_hdrlen
- sizeof(struct sockaddr_ll
));
2377 if (size_max
> dev
->mtu
+ reserve
)
2378 size_max
= dev
->mtu
+ reserve
;
2381 ph
= packet_current_frame(po
, &po
->tx_ring
,
2382 TP_STATUS_SEND_REQUEST
);
2383 if (unlikely(ph
== NULL
)) {
2384 if (need_wait
&& need_resched())
2389 status
= TP_STATUS_SEND_REQUEST
;
2390 hlen
= LL_RESERVED_SPACE(dev
);
2391 tlen
= dev
->needed_tailroom
;
2392 skb
= sock_alloc_send_skb(&po
->sk
,
2393 hlen
+ tlen
+ sizeof(struct sockaddr_ll
),
2396 if (unlikely(skb
== NULL
)) {
2397 /* we assume the socket was initially writeable ... */
2398 if (likely(len_sum
> 0))
2402 tp_len
= tpacket_fill_skb(po
, skb
, ph
, dev
, size_max
, proto
,
2404 if (likely(tp_len
>= 0) &&
2405 tp_len
> dev
->mtu
+ dev
->hard_header_len
) {
2406 struct ethhdr
*ehdr
;
2407 /* Earlier code assumed this would be a VLAN pkt,
2408 * double-check this now that we have the actual
2412 skb_reset_mac_header(skb
);
2413 ehdr
= eth_hdr(skb
);
2414 if (ehdr
->h_proto
!= htons(ETH_P_8021Q
))
2417 if (unlikely(tp_len
< 0)) {
2419 __packet_set_status(po
, ph
,
2420 TP_STATUS_AVAILABLE
);
2421 packet_increment_head(&po
->tx_ring
);
2425 status
= TP_STATUS_WRONG_FORMAT
;
2431 packet_pick_tx_queue(dev
, skb
);
2433 skb
->destructor
= tpacket_destruct_skb
;
2434 __packet_set_status(po
, ph
, TP_STATUS_SENDING
);
2435 packet_inc_pending(&po
->tx_ring
);
2437 status
= TP_STATUS_SEND_REQUEST
;
2438 err
= po
->xmit(skb
);
2439 if (unlikely(err
> 0)) {
2440 err
= net_xmit_errno(err
);
2441 if (err
&& __packet_get_status(po
, ph
) ==
2442 TP_STATUS_AVAILABLE
) {
2443 /* skb was destructed already */
2448 * skb was dropped but not destructed yet;
2449 * let's treat it like congestion or err < 0
2453 packet_increment_head(&po
->tx_ring
);
2455 } while (likely((ph
!= NULL
) ||
2456 /* Note: packet_read_pending() might be slow if we have
2457 * to call it as it's per_cpu variable, but in fast-path
2458 * we already short-circuit the loop with the first
2459 * condition, and luckily don't have to go that path
2462 (need_wait
&& packet_read_pending(&po
->tx_ring
))));
2468 __packet_set_status(po
, ph
, status
);
2473 mutex_unlock(&po
->pg_vec_lock
);
2477 static struct sk_buff
*packet_alloc_skb(struct sock
*sk
, size_t prepad
,
2478 size_t reserve
, size_t len
,
2479 size_t linear
, int noblock
,
2482 struct sk_buff
*skb
;
2484 /* Under a page? Don't bother with paged skb. */
2485 if (prepad
+ len
< PAGE_SIZE
|| !linear
)
2488 skb
= sock_alloc_send_pskb(sk
, prepad
+ linear
, len
- linear
, noblock
,
2493 skb_reserve(skb
, reserve
);
2494 skb_put(skb
, linear
);
2495 skb
->data_len
= len
- linear
;
2496 skb
->len
+= len
- linear
;
2501 static int packet_snd(struct socket
*sock
, struct msghdr
*msg
, size_t len
)
2503 struct sock
*sk
= sock
->sk
;
2504 DECLARE_SOCKADDR(struct sockaddr_ll
*, saddr
, msg
->msg_name
);
2505 struct sk_buff
*skb
;
2506 struct net_device
*dev
;
2508 unsigned char *addr
;
2509 int err
, reserve
= 0;
2510 struct virtio_net_hdr vnet_hdr
= { 0 };
2513 struct packet_sock
*po
= pkt_sk(sk
);
2514 unsigned short gso_type
= 0;
2520 * Get and verify the address.
2523 if (likely(saddr
== NULL
)) {
2524 dev
= packet_cached_dev_get(po
);
2529 if (msg
->msg_namelen
< sizeof(struct sockaddr_ll
))
2531 if (msg
->msg_namelen
< (saddr
->sll_halen
+ offsetof(struct sockaddr_ll
, sll_addr
)))
2533 proto
= saddr
->sll_protocol
;
2534 addr
= saddr
->sll_addr
;
2535 dev
= dev_get_by_index(sock_net(sk
), saddr
->sll_ifindex
);
2539 if (unlikely(dev
== NULL
))
2542 if (unlikely(!(dev
->flags
& IFF_UP
)))
2545 if (sock
->type
== SOCK_RAW
)
2546 reserve
= dev
->hard_header_len
;
2547 if (po
->has_vnet_hdr
) {
2548 vnet_hdr_len
= sizeof(vnet_hdr
);
2551 if (len
< vnet_hdr_len
)
2554 len
-= vnet_hdr_len
;
2557 n
= copy_from_iter(&vnet_hdr
, vnet_hdr_len
, &msg
->msg_iter
);
2558 if (n
!= vnet_hdr_len
)
2561 if ((vnet_hdr
.flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) &&
2562 (__virtio16_to_cpu(false, vnet_hdr
.csum_start
) +
2563 __virtio16_to_cpu(false, vnet_hdr
.csum_offset
) + 2 >
2564 __virtio16_to_cpu(false, vnet_hdr
.hdr_len
)))
2565 vnet_hdr
.hdr_len
= __cpu_to_virtio16(false,
2566 __virtio16_to_cpu(false, vnet_hdr
.csum_start
) +
2567 __virtio16_to_cpu(false, vnet_hdr
.csum_offset
) + 2);
2570 if (__virtio16_to_cpu(false, vnet_hdr
.hdr_len
) > len
)
2573 if (vnet_hdr
.gso_type
!= VIRTIO_NET_HDR_GSO_NONE
) {
2574 switch (vnet_hdr
.gso_type
& ~VIRTIO_NET_HDR_GSO_ECN
) {
2575 case VIRTIO_NET_HDR_GSO_TCPV4
:
2576 gso_type
= SKB_GSO_TCPV4
;
2578 case VIRTIO_NET_HDR_GSO_TCPV6
:
2579 gso_type
= SKB_GSO_TCPV6
;
2581 case VIRTIO_NET_HDR_GSO_UDP
:
2582 gso_type
= SKB_GSO_UDP
;
2588 if (vnet_hdr
.gso_type
& VIRTIO_NET_HDR_GSO_ECN
)
2589 gso_type
|= SKB_GSO_TCP_ECN
;
2591 if (vnet_hdr
.gso_size
== 0)
2597 if (unlikely(sock_flag(sk
, SOCK_NOFCS
))) {
2598 if (!netif_supports_nofcs(dev
)) {
2599 err
= -EPROTONOSUPPORT
;
2602 extra_len
= 4; /* We're doing our own CRC */
2606 if (!gso_type
&& (len
> dev
->mtu
+ reserve
+ VLAN_HLEN
+ extra_len
))
2610 hlen
= LL_RESERVED_SPACE(dev
);
2611 tlen
= dev
->needed_tailroom
;
2612 skb
= packet_alloc_skb(sk
, hlen
+ tlen
, hlen
, len
,
2613 __virtio16_to_cpu(false, vnet_hdr
.hdr_len
),
2614 msg
->msg_flags
& MSG_DONTWAIT
, &err
);
2618 skb_set_network_header(skb
, reserve
);
2621 if (sock
->type
== SOCK_DGRAM
) {
2622 offset
= dev_hard_header(skb
, dev
, ntohs(proto
), addr
, NULL
, len
);
2623 if (unlikely(offset
< 0))
2626 if (ll_header_truncated(dev
, len
))
2630 /* Returns -EFAULT on error */
2631 err
= skb_copy_datagram_from_iter(skb
, offset
, &msg
->msg_iter
, len
);
2635 sock_tx_timestamp(sk
, &skb_shinfo(skb
)->tx_flags
);
2637 if (!gso_type
&& (len
> dev
->mtu
+ reserve
+ extra_len
)) {
2638 /* Earlier code assumed this would be a VLAN pkt,
2639 * double-check this now that we have the actual
2642 struct ethhdr
*ehdr
;
2643 skb_reset_mac_header(skb
);
2644 ehdr
= eth_hdr(skb
);
2645 if (ehdr
->h_proto
!= htons(ETH_P_8021Q
)) {
2651 skb
->protocol
= proto
;
2653 skb
->priority
= sk
->sk_priority
;
2654 skb
->mark
= sk
->sk_mark
;
2656 packet_pick_tx_queue(dev
, skb
);
2658 if (po
->has_vnet_hdr
) {
2659 if (vnet_hdr
.flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) {
2660 u16 s
= __virtio16_to_cpu(false, vnet_hdr
.csum_start
);
2661 u16 o
= __virtio16_to_cpu(false, vnet_hdr
.csum_offset
);
2662 if (!skb_partial_csum_set(skb
, s
, o
)) {
2668 skb_shinfo(skb
)->gso_size
=
2669 __virtio16_to_cpu(false, vnet_hdr
.gso_size
);
2670 skb_shinfo(skb
)->gso_type
= gso_type
;
2672 /* Header must be checked, and gso_segs computed. */
2673 skb_shinfo(skb
)->gso_type
|= SKB_GSO_DODGY
;
2674 skb_shinfo(skb
)->gso_segs
= 0;
2676 len
+= vnet_hdr_len
;
2679 if (!packet_use_direct_xmit(po
))
2680 skb_probe_transport_header(skb
, reserve
);
2681 if (unlikely(extra_len
== 4))
2684 err
= po
->xmit(skb
);
2685 if (err
> 0 && (err
= net_xmit_errno(err
)) != 0)
2701 static int packet_sendmsg(struct socket
*sock
, struct msghdr
*msg
, size_t len
)
2703 struct sock
*sk
= sock
->sk
;
2704 struct packet_sock
*po
= pkt_sk(sk
);
2706 if (po
->tx_ring
.pg_vec
)
2707 return tpacket_snd(po
, msg
);
2709 return packet_snd(sock
, msg
, len
);
2713 * Close a PACKET socket. This is fairly simple. We immediately go
2714 * to 'closed' state and remove our protocol entry in the device list.
2717 static int packet_release(struct socket
*sock
)
2719 struct sock
*sk
= sock
->sk
;
2720 struct packet_sock
*po
;
2722 union tpacket_req_u req_u
;
2730 mutex_lock(&net
->packet
.sklist_lock
);
2731 sk_del_node_init_rcu(sk
);
2732 mutex_unlock(&net
->packet
.sklist_lock
);
2735 sock_prot_inuse_add(net
, sk
->sk_prot
, -1);
2738 spin_lock(&po
->bind_lock
);
2739 unregister_prot_hook(sk
, false);
2740 packet_cached_dev_reset(po
);
2742 if (po
->prot_hook
.dev
) {
2743 dev_put(po
->prot_hook
.dev
);
2744 po
->prot_hook
.dev
= NULL
;
2746 spin_unlock(&po
->bind_lock
);
2748 packet_flush_mclist(sk
);
2750 if (po
->rx_ring
.pg_vec
) {
2751 memset(&req_u
, 0, sizeof(req_u
));
2752 packet_set_ring(sk
, &req_u
, 1, 0);
2755 if (po
->tx_ring
.pg_vec
) {
2756 memset(&req_u
, 0, sizeof(req_u
));
2757 packet_set_ring(sk
, &req_u
, 1, 1);
2764 * Now the socket is dead. No more input will appear.
2771 skb_queue_purge(&sk
->sk_receive_queue
);
2772 packet_free_pending(po
);
2773 sk_refcnt_debug_release(sk
);
2780 * Attach a packet hook.
2783 static int packet_do_bind(struct sock
*sk
, struct net_device
*dev
, __be16 proto
)
2785 struct packet_sock
*po
= pkt_sk(sk
);
2786 struct net_device
*dev_curr
;
2798 spin_lock(&po
->bind_lock
);
2800 proto_curr
= po
->prot_hook
.type
;
2801 dev_curr
= po
->prot_hook
.dev
;
2803 need_rehook
= proto_curr
!= proto
|| dev_curr
!= dev
;
2806 unregister_prot_hook(sk
, true);
2809 po
->prot_hook
.type
= proto
;
2810 po
->prot_hook
.dev
= dev
;
2812 po
->ifindex
= dev
? dev
->ifindex
: 0;
2813 packet_cached_dev_assign(po
, dev
);
2818 if (proto
== 0 || !need_rehook
)
2821 if (!dev
|| (dev
->flags
& IFF_UP
)) {
2822 register_prot_hook(sk
);
2824 sk
->sk_err
= ENETDOWN
;
2825 if (!sock_flag(sk
, SOCK_DEAD
))
2826 sk
->sk_error_report(sk
);
2830 spin_unlock(&po
->bind_lock
);
2836 * Bind a packet socket to a device
2839 static int packet_bind_spkt(struct socket
*sock
, struct sockaddr
*uaddr
,
2842 struct sock
*sk
= sock
->sk
;
2844 struct net_device
*dev
;
2851 if (addr_len
!= sizeof(struct sockaddr
))
2853 strlcpy(name
, uaddr
->sa_data
, sizeof(name
));
2855 dev
= dev_get_by_name(sock_net(sk
), name
);
2857 err
= packet_do_bind(sk
, dev
, pkt_sk(sk
)->num
);
2861 static int packet_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
)
2863 struct sockaddr_ll
*sll
= (struct sockaddr_ll
*)uaddr
;
2864 struct sock
*sk
= sock
->sk
;
2865 struct net_device
*dev
= NULL
;
2873 if (addr_len
< sizeof(struct sockaddr_ll
))
2875 if (sll
->sll_family
!= AF_PACKET
)
2878 if (sll
->sll_ifindex
) {
2880 dev
= dev_get_by_index(sock_net(sk
), sll
->sll_ifindex
);
2884 err
= packet_do_bind(sk
, dev
, sll
->sll_protocol
? : pkt_sk(sk
)->num
);
2890 static struct proto packet_proto
= {
2892 .owner
= THIS_MODULE
,
2893 .obj_size
= sizeof(struct packet_sock
),
2897 * Create a packet of type SOCK_PACKET.
2900 static int packet_create(struct net
*net
, struct socket
*sock
, int protocol
,
2904 struct packet_sock
*po
;
2905 __be16 proto
= (__force __be16
)protocol
; /* weird, but documented */
2908 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
))
2910 if (sock
->type
!= SOCK_DGRAM
&& sock
->type
!= SOCK_RAW
&&
2911 sock
->type
!= SOCK_PACKET
)
2912 return -ESOCKTNOSUPPORT
;
2914 sock
->state
= SS_UNCONNECTED
;
2917 sk
= sk_alloc(net
, PF_PACKET
, GFP_KERNEL
, &packet_proto
, kern
);
2921 sock
->ops
= &packet_ops
;
2922 if (sock
->type
== SOCK_PACKET
)
2923 sock
->ops
= &packet_ops_spkt
;
2925 sock_init_data(sock
, sk
);
2928 sk
->sk_family
= PF_PACKET
;
2930 po
->xmit
= dev_queue_xmit
;
2932 err
= packet_alloc_pending(po
);
2936 packet_cached_dev_reset(po
);
2938 sk
->sk_destruct
= packet_sock_destruct
;
2939 sk_refcnt_debug_inc(sk
);
2942 * Attach a protocol block
2945 spin_lock_init(&po
->bind_lock
);
2946 mutex_init(&po
->pg_vec_lock
);
2947 po
->rollover
= NULL
;
2948 po
->prot_hook
.func
= packet_rcv
;
2950 if (sock
->type
== SOCK_PACKET
)
2951 po
->prot_hook
.func
= packet_rcv_spkt
;
2953 po
->prot_hook
.af_packet_priv
= sk
;
2956 po
->prot_hook
.type
= proto
;
2957 register_prot_hook(sk
);
2960 mutex_lock(&net
->packet
.sklist_lock
);
2961 sk_add_node_rcu(sk
, &net
->packet
.sklist
);
2962 mutex_unlock(&net
->packet
.sklist_lock
);
2965 sock_prot_inuse_add(net
, &packet_proto
, 1);
2976 * Pull a packet from our receive queue and hand it to the user.
2977 * If necessary we block.
2980 static int packet_recvmsg(struct socket
*sock
, struct msghdr
*msg
, size_t len
,
2983 struct sock
*sk
= sock
->sk
;
2984 struct sk_buff
*skb
;
2986 int vnet_hdr_len
= 0;
2987 unsigned int origlen
= 0;
2990 if (flags
& ~(MSG_PEEK
|MSG_DONTWAIT
|MSG_TRUNC
|MSG_CMSG_COMPAT
|MSG_ERRQUEUE
))
2994 /* What error should we return now? EUNATTACH? */
2995 if (pkt_sk(sk
)->ifindex
< 0)
2999 if (flags
& MSG_ERRQUEUE
) {
3000 err
= sock_recv_errqueue(sk
, msg
, len
,
3001 SOL_PACKET
, PACKET_TX_TIMESTAMP
);
3006 * Call the generic datagram receiver. This handles all sorts
3007 * of horrible races and re-entrancy so we can forget about it
3008 * in the protocol layers.
3010 * Now it will return ENETDOWN, if device have just gone down,
3011 * but then it will block.
3014 skb
= skb_recv_datagram(sk
, flags
, flags
& MSG_DONTWAIT
, &err
);
3017 * An error occurred so return it. Because skb_recv_datagram()
3018 * handles the blocking we don't see and worry about blocking
3025 if (pkt_sk(sk
)->pressure
)
3026 packet_rcv_has_room(pkt_sk(sk
), NULL
);
3028 if (pkt_sk(sk
)->has_vnet_hdr
) {
3029 struct virtio_net_hdr vnet_hdr
= { 0 };
3032 vnet_hdr_len
= sizeof(vnet_hdr
);
3033 if (len
< vnet_hdr_len
)
3036 len
-= vnet_hdr_len
;
3038 if (skb_is_gso(skb
)) {
3039 struct skb_shared_info
*sinfo
= skb_shinfo(skb
);
3041 /* This is a hint as to how much should be linear. */
3043 __cpu_to_virtio16(false, skb_headlen(skb
));
3045 __cpu_to_virtio16(false, sinfo
->gso_size
);
3046 if (sinfo
->gso_type
& SKB_GSO_TCPV4
)
3047 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV4
;
3048 else if (sinfo
->gso_type
& SKB_GSO_TCPV6
)
3049 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV6
;
3050 else if (sinfo
->gso_type
& SKB_GSO_UDP
)
3051 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_UDP
;
3052 else if (sinfo
->gso_type
& SKB_GSO_FCOE
)
3056 if (sinfo
->gso_type
& SKB_GSO_TCP_ECN
)
3057 vnet_hdr
.gso_type
|= VIRTIO_NET_HDR_GSO_ECN
;
3059 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_NONE
;
3061 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
3062 vnet_hdr
.flags
= VIRTIO_NET_HDR_F_NEEDS_CSUM
;
3063 vnet_hdr
.csum_start
= __cpu_to_virtio16(false,
3064 skb_checksum_start_offset(skb
));
3065 vnet_hdr
.csum_offset
= __cpu_to_virtio16(false,
3067 } else if (skb
->ip_summed
== CHECKSUM_UNNECESSARY
) {
3068 vnet_hdr
.flags
= VIRTIO_NET_HDR_F_DATA_VALID
;
3069 } /* else everything is zero */
3071 err
= memcpy_to_msg(msg
, (void *)&vnet_hdr
, vnet_hdr_len
);
3076 /* You lose any data beyond the buffer you gave. If it worries
3077 * a user program they can ask the device for its MTU
3083 msg
->msg_flags
|= MSG_TRUNC
;
3086 err
= skb_copy_datagram_msg(skb
, 0, msg
, copied
);
3090 if (sock
->type
!= SOCK_PACKET
) {
3091 struct sockaddr_ll
*sll
= &PACKET_SKB_CB(skb
)->sa
.ll
;
3093 /* Original length was stored in sockaddr_ll fields */
3094 origlen
= PACKET_SKB_CB(skb
)->sa
.origlen
;
3095 sll
->sll_family
= AF_PACKET
;
3096 sll
->sll_protocol
= skb
->protocol
;
3099 sock_recv_ts_and_drops(msg
, sk
, skb
);
3101 if (msg
->msg_name
) {
3102 /* If the address length field is there to be filled
3103 * in, we fill it in now.
3105 if (sock
->type
== SOCK_PACKET
) {
3106 __sockaddr_check_size(sizeof(struct sockaddr_pkt
));
3107 msg
->msg_namelen
= sizeof(struct sockaddr_pkt
);
3109 struct sockaddr_ll
*sll
= &PACKET_SKB_CB(skb
)->sa
.ll
;
3111 msg
->msg_namelen
= sll
->sll_halen
+
3112 offsetof(struct sockaddr_ll
, sll_addr
);
3114 memcpy(msg
->msg_name
, &PACKET_SKB_CB(skb
)->sa
,
3118 if (pkt_sk(sk
)->auxdata
) {
3119 struct tpacket_auxdata aux
;
3121 aux
.tp_status
= TP_STATUS_USER
;
3122 if (skb
->ip_summed
== CHECKSUM_PARTIAL
)
3123 aux
.tp_status
|= TP_STATUS_CSUMNOTREADY
;
3124 else if (skb
->pkt_type
!= PACKET_OUTGOING
&&
3125 (skb
->ip_summed
== CHECKSUM_COMPLETE
||
3126 skb_csum_unnecessary(skb
)))
3127 aux
.tp_status
|= TP_STATUS_CSUM_VALID
;
3129 aux
.tp_len
= origlen
;
3130 aux
.tp_snaplen
= skb
->len
;
3132 aux
.tp_net
= skb_network_offset(skb
);
3133 if (skb_vlan_tag_present(skb
)) {
3134 aux
.tp_vlan_tci
= skb_vlan_tag_get(skb
);
3135 aux
.tp_vlan_tpid
= ntohs(skb
->vlan_proto
);
3136 aux
.tp_status
|= TP_STATUS_VLAN_VALID
| TP_STATUS_VLAN_TPID_VALID
;
3138 aux
.tp_vlan_tci
= 0;
3139 aux
.tp_vlan_tpid
= 0;
3141 put_cmsg(msg
, SOL_PACKET
, PACKET_AUXDATA
, sizeof(aux
), &aux
);
3145 * Free or return the buffer as appropriate. Again this
3146 * hides all the races and re-entrancy issues from us.
3148 err
= vnet_hdr_len
+ ((flags
&MSG_TRUNC
) ? skb
->len
: copied
);
3151 skb_free_datagram(sk
, skb
);
3156 static int packet_getname_spkt(struct socket
*sock
, struct sockaddr
*uaddr
,
3157 int *uaddr_len
, int peer
)
3159 struct net_device
*dev
;
3160 struct sock
*sk
= sock
->sk
;
3165 uaddr
->sa_family
= AF_PACKET
;
3166 memset(uaddr
->sa_data
, 0, sizeof(uaddr
->sa_data
));
3168 dev
= dev_get_by_index_rcu(sock_net(sk
), pkt_sk(sk
)->ifindex
);
3170 strlcpy(uaddr
->sa_data
, dev
->name
, sizeof(uaddr
->sa_data
));
3172 *uaddr_len
= sizeof(*uaddr
);
3177 static int packet_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
3178 int *uaddr_len
, int peer
)
3180 struct net_device
*dev
;
3181 struct sock
*sk
= sock
->sk
;
3182 struct packet_sock
*po
= pkt_sk(sk
);
3183 DECLARE_SOCKADDR(struct sockaddr_ll
*, sll
, uaddr
);
3188 sll
->sll_family
= AF_PACKET
;
3189 sll
->sll_ifindex
= po
->ifindex
;
3190 sll
->sll_protocol
= po
->num
;
3191 sll
->sll_pkttype
= 0;
3193 dev
= dev_get_by_index_rcu(sock_net(sk
), po
->ifindex
);
3195 sll
->sll_hatype
= dev
->type
;
3196 sll
->sll_halen
= dev
->addr_len
;
3197 memcpy(sll
->sll_addr
, dev
->dev_addr
, dev
->addr_len
);
3199 sll
->sll_hatype
= 0; /* Bad: we have no ARPHRD_UNSPEC */
3203 *uaddr_len
= offsetof(struct sockaddr_ll
, sll_addr
) + sll
->sll_halen
;
3208 static int packet_dev_mc(struct net_device
*dev
, struct packet_mclist
*i
,
3212 case PACKET_MR_MULTICAST
:
3213 if (i
->alen
!= dev
->addr_len
)
3216 return dev_mc_add(dev
, i
->addr
);
3218 return dev_mc_del(dev
, i
->addr
);
3220 case PACKET_MR_PROMISC
:
3221 return dev_set_promiscuity(dev
, what
);
3222 case PACKET_MR_ALLMULTI
:
3223 return dev_set_allmulti(dev
, what
);
3224 case PACKET_MR_UNICAST
:
3225 if (i
->alen
!= dev
->addr_len
)
3228 return dev_uc_add(dev
, i
->addr
);
3230 return dev_uc_del(dev
, i
->addr
);
3238 static void packet_dev_mclist_delete(struct net_device
*dev
,
3239 struct packet_mclist
**mlp
)
3241 struct packet_mclist
*ml
;
3243 while ((ml
= *mlp
) != NULL
) {
3244 if (ml
->ifindex
== dev
->ifindex
) {
3245 packet_dev_mc(dev
, ml
, -1);
3253 static int packet_mc_add(struct sock
*sk
, struct packet_mreq_max
*mreq
)
3255 struct packet_sock
*po
= pkt_sk(sk
);
3256 struct packet_mclist
*ml
, *i
;
3257 struct net_device
*dev
;
3263 dev
= __dev_get_by_index(sock_net(sk
), mreq
->mr_ifindex
);
3268 if (mreq
->mr_alen
> dev
->addr_len
)
3272 i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
3277 for (ml
= po
->mclist
; ml
; ml
= ml
->next
) {
3278 if (ml
->ifindex
== mreq
->mr_ifindex
&&
3279 ml
->type
== mreq
->mr_type
&&
3280 ml
->alen
== mreq
->mr_alen
&&
3281 memcmp(ml
->addr
, mreq
->mr_address
, ml
->alen
) == 0) {
3283 /* Free the new element ... */
3289 i
->type
= mreq
->mr_type
;
3290 i
->ifindex
= mreq
->mr_ifindex
;
3291 i
->alen
= mreq
->mr_alen
;
3292 memcpy(i
->addr
, mreq
->mr_address
, i
->alen
);
3294 i
->next
= po
->mclist
;
3296 err
= packet_dev_mc(dev
, i
, 1);
3298 po
->mclist
= i
->next
;
3307 static int packet_mc_drop(struct sock
*sk
, struct packet_mreq_max
*mreq
)
3309 struct packet_mclist
*ml
, **mlp
;
3313 for (mlp
= &pkt_sk(sk
)->mclist
; (ml
= *mlp
) != NULL
; mlp
= &ml
->next
) {
3314 if (ml
->ifindex
== mreq
->mr_ifindex
&&
3315 ml
->type
== mreq
->mr_type
&&
3316 ml
->alen
== mreq
->mr_alen
&&
3317 memcmp(ml
->addr
, mreq
->mr_address
, ml
->alen
) == 0) {
3318 if (--ml
->count
== 0) {
3319 struct net_device
*dev
;
3321 dev
= __dev_get_by_index(sock_net(sk
), ml
->ifindex
);
3323 packet_dev_mc(dev
, ml
, -1);
3333 static void packet_flush_mclist(struct sock
*sk
)
3335 struct packet_sock
*po
= pkt_sk(sk
);
3336 struct packet_mclist
*ml
;
3342 while ((ml
= po
->mclist
) != NULL
) {
3343 struct net_device
*dev
;
3345 po
->mclist
= ml
->next
;
3346 dev
= __dev_get_by_index(sock_net(sk
), ml
->ifindex
);
3348 packet_dev_mc(dev
, ml
, -1);
3355 packet_setsockopt(struct socket
*sock
, int level
, int optname
, char __user
*optval
, unsigned int optlen
)
3357 struct sock
*sk
= sock
->sk
;
3358 struct packet_sock
*po
= pkt_sk(sk
);
3361 if (level
!= SOL_PACKET
)
3362 return -ENOPROTOOPT
;
3365 case PACKET_ADD_MEMBERSHIP
:
3366 case PACKET_DROP_MEMBERSHIP
:
3368 struct packet_mreq_max mreq
;
3370 memset(&mreq
, 0, sizeof(mreq
));
3371 if (len
< sizeof(struct packet_mreq
))
3373 if (len
> sizeof(mreq
))
3375 if (copy_from_user(&mreq
, optval
, len
))
3377 if (len
< (mreq
.mr_alen
+ offsetof(struct packet_mreq
, mr_address
)))
3379 if (optname
== PACKET_ADD_MEMBERSHIP
)
3380 ret
= packet_mc_add(sk
, &mreq
);
3382 ret
= packet_mc_drop(sk
, &mreq
);
3386 case PACKET_RX_RING
:
3387 case PACKET_TX_RING
:
3389 union tpacket_req_u req_u
;
3392 switch (po
->tp_version
) {
3395 len
= sizeof(req_u
.req
);
3399 len
= sizeof(req_u
.req3
);
3404 if (pkt_sk(sk
)->has_vnet_hdr
)
3406 if (copy_from_user(&req_u
.req
, optval
, len
))
3408 return packet_set_ring(sk
, &req_u
, 0,
3409 optname
== PACKET_TX_RING
);
3411 case PACKET_COPY_THRESH
:
3415 if (optlen
!= sizeof(val
))
3417 if (copy_from_user(&val
, optval
, sizeof(val
)))
3420 pkt_sk(sk
)->copy_thresh
= val
;
3423 case PACKET_VERSION
:
3427 if (optlen
!= sizeof(val
))
3429 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3431 if (copy_from_user(&val
, optval
, sizeof(val
)))
3437 po
->tp_version
= val
;
3443 case PACKET_RESERVE
:
3447 if (optlen
!= sizeof(val
))
3449 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3451 if (copy_from_user(&val
, optval
, sizeof(val
)))
3453 po
->tp_reserve
= val
;
3460 if (optlen
!= sizeof(val
))
3462 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3464 if (copy_from_user(&val
, optval
, sizeof(val
)))
3466 po
->tp_loss
= !!val
;
3469 case PACKET_AUXDATA
:
3473 if (optlen
< sizeof(val
))
3475 if (copy_from_user(&val
, optval
, sizeof(val
)))
3478 po
->auxdata
= !!val
;
3481 case PACKET_ORIGDEV
:
3485 if (optlen
< sizeof(val
))
3487 if (copy_from_user(&val
, optval
, sizeof(val
)))
3490 po
->origdev
= !!val
;
3493 case PACKET_VNET_HDR
:
3497 if (sock
->type
!= SOCK_RAW
)
3499 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3501 if (optlen
< sizeof(val
))
3503 if (copy_from_user(&val
, optval
, sizeof(val
)))
3506 po
->has_vnet_hdr
= !!val
;
3509 case PACKET_TIMESTAMP
:
3513 if (optlen
!= sizeof(val
))
3515 if (copy_from_user(&val
, optval
, sizeof(val
)))
3518 po
->tp_tstamp
= val
;
3525 if (optlen
!= sizeof(val
))
3527 if (copy_from_user(&val
, optval
, sizeof(val
)))
3530 return fanout_add(sk
, val
& 0xffff, val
>> 16);
3532 case PACKET_TX_HAS_OFF
:
3536 if (optlen
!= sizeof(val
))
3538 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3540 if (copy_from_user(&val
, optval
, sizeof(val
)))
3542 po
->tp_tx_has_off
= !!val
;
3545 case PACKET_QDISC_BYPASS
:
3549 if (optlen
!= sizeof(val
))
3551 if (copy_from_user(&val
, optval
, sizeof(val
)))
3554 po
->xmit
= val
? packet_direct_xmit
: dev_queue_xmit
;
3558 return -ENOPROTOOPT
;
3562 static int packet_getsockopt(struct socket
*sock
, int level
, int optname
,
3563 char __user
*optval
, int __user
*optlen
)
3566 int val
, lv
= sizeof(val
);
3567 struct sock
*sk
= sock
->sk
;
3568 struct packet_sock
*po
= pkt_sk(sk
);
3570 union tpacket_stats_u st
;
3571 struct tpacket_rollover_stats rstats
;
3573 if (level
!= SOL_PACKET
)
3574 return -ENOPROTOOPT
;
3576 if (get_user(len
, optlen
))
3583 case PACKET_STATISTICS
:
3584 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
3585 memcpy(&st
, &po
->stats
, sizeof(st
));
3586 memset(&po
->stats
, 0, sizeof(po
->stats
));
3587 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
3589 if (po
->tp_version
== TPACKET_V3
) {
3590 lv
= sizeof(struct tpacket_stats_v3
);
3591 st
.stats3
.tp_packets
+= st
.stats3
.tp_drops
;
3594 lv
= sizeof(struct tpacket_stats
);
3595 st
.stats1
.tp_packets
+= st
.stats1
.tp_drops
;
3600 case PACKET_AUXDATA
:
3603 case PACKET_ORIGDEV
:
3606 case PACKET_VNET_HDR
:
3607 val
= po
->has_vnet_hdr
;
3609 case PACKET_VERSION
:
3610 val
= po
->tp_version
;
3613 if (len
> sizeof(int))
3615 if (copy_from_user(&val
, optval
, len
))
3619 val
= sizeof(struct tpacket_hdr
);
3622 val
= sizeof(struct tpacket2_hdr
);
3625 val
= sizeof(struct tpacket3_hdr
);
3631 case PACKET_RESERVE
:
3632 val
= po
->tp_reserve
;
3637 case PACKET_TIMESTAMP
:
3638 val
= po
->tp_tstamp
;
3642 ((u32
)po
->fanout
->id
|
3643 ((u32
)po
->fanout
->type
<< 16) |
3644 ((u32
)po
->fanout
->flags
<< 24)) :
3647 case PACKET_ROLLOVER_STATS
:
3650 rstats
.tp_all
= atomic_long_read(&po
->rollover
->num
);
3651 rstats
.tp_huge
= atomic_long_read(&po
->rollover
->num_huge
);
3652 rstats
.tp_failed
= atomic_long_read(&po
->rollover
->num_failed
);
3654 lv
= sizeof(rstats
);
3656 case PACKET_TX_HAS_OFF
:
3657 val
= po
->tp_tx_has_off
;
3659 case PACKET_QDISC_BYPASS
:
3660 val
= packet_use_direct_xmit(po
);
3663 return -ENOPROTOOPT
;
3668 if (put_user(len
, optlen
))
3670 if (copy_to_user(optval
, data
, len
))
3676 static int packet_notifier(struct notifier_block
*this,
3677 unsigned long msg
, void *ptr
)
3680 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
3681 struct net
*net
= dev_net(dev
);
3684 sk_for_each_rcu(sk
, &net
->packet
.sklist
) {
3685 struct packet_sock
*po
= pkt_sk(sk
);
3688 case NETDEV_UNREGISTER
:
3690 packet_dev_mclist_delete(dev
, &po
->mclist
);
3694 if (dev
->ifindex
== po
->ifindex
) {
3695 spin_lock(&po
->bind_lock
);
3697 __unregister_prot_hook(sk
, false);
3698 sk
->sk_err
= ENETDOWN
;
3699 if (!sock_flag(sk
, SOCK_DEAD
))
3700 sk
->sk_error_report(sk
);
3702 if (msg
== NETDEV_UNREGISTER
) {
3703 packet_cached_dev_reset(po
);
3705 if (po
->prot_hook
.dev
)
3706 dev_put(po
->prot_hook
.dev
);
3707 po
->prot_hook
.dev
= NULL
;
3709 spin_unlock(&po
->bind_lock
);
3713 if (dev
->ifindex
== po
->ifindex
) {
3714 spin_lock(&po
->bind_lock
);
3716 register_prot_hook(sk
);
3717 spin_unlock(&po
->bind_lock
);
3727 static int packet_ioctl(struct socket
*sock
, unsigned int cmd
,
3730 struct sock
*sk
= sock
->sk
;
3735 int amount
= sk_wmem_alloc_get(sk
);
3737 return put_user(amount
, (int __user
*)arg
);
3741 struct sk_buff
*skb
;
3744 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
3745 skb
= skb_peek(&sk
->sk_receive_queue
);
3748 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
3749 return put_user(amount
, (int __user
*)arg
);
3752 return sock_get_timestamp(sk
, (struct timeval __user
*)arg
);
3754 return sock_get_timestampns(sk
, (struct timespec __user
*)arg
);
3764 case SIOCGIFBRDADDR
:
3765 case SIOCSIFBRDADDR
:
3766 case SIOCGIFNETMASK
:
3767 case SIOCSIFNETMASK
:
3768 case SIOCGIFDSTADDR
:
3769 case SIOCSIFDSTADDR
:
3771 return inet_dgram_ops
.ioctl(sock
, cmd
, arg
);
3775 return -ENOIOCTLCMD
;
3780 static unsigned int packet_poll(struct file
*file
, struct socket
*sock
,
3783 struct sock
*sk
= sock
->sk
;
3784 struct packet_sock
*po
= pkt_sk(sk
);
3785 unsigned int mask
= datagram_poll(file
, sock
, wait
);
3787 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
3788 if (po
->rx_ring
.pg_vec
) {
3789 if (!packet_previous_rx_frame(po
, &po
->rx_ring
,
3791 mask
|= POLLIN
| POLLRDNORM
;
3793 if (po
->pressure
&& __packet_rcv_has_room(po
, NULL
) == ROOM_NORMAL
)
3795 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
3796 spin_lock_bh(&sk
->sk_write_queue
.lock
);
3797 if (po
->tx_ring
.pg_vec
) {
3798 if (packet_current_frame(po
, &po
->tx_ring
, TP_STATUS_AVAILABLE
))
3799 mask
|= POLLOUT
| POLLWRNORM
;
3801 spin_unlock_bh(&sk
->sk_write_queue
.lock
);
3806 /* Dirty? Well, I still did not learn better way to account
3810 static void packet_mm_open(struct vm_area_struct
*vma
)
3812 struct file
*file
= vma
->vm_file
;
3813 struct socket
*sock
= file
->private_data
;
3814 struct sock
*sk
= sock
->sk
;
3817 atomic_inc(&pkt_sk(sk
)->mapped
);
3820 static void packet_mm_close(struct vm_area_struct
*vma
)
3822 struct file
*file
= vma
->vm_file
;
3823 struct socket
*sock
= file
->private_data
;
3824 struct sock
*sk
= sock
->sk
;
3827 atomic_dec(&pkt_sk(sk
)->mapped
);
3830 static const struct vm_operations_struct packet_mmap_ops
= {
3831 .open
= packet_mm_open
,
3832 .close
= packet_mm_close
,
3835 static void free_pg_vec(struct pgv
*pg_vec
, unsigned int order
,
3840 for (i
= 0; i
< len
; i
++) {
3841 if (likely(pg_vec
[i
].buffer
)) {
3842 if (is_vmalloc_addr(pg_vec
[i
].buffer
))
3843 vfree(pg_vec
[i
].buffer
);
3845 free_pages((unsigned long)pg_vec
[i
].buffer
,
3847 pg_vec
[i
].buffer
= NULL
;
3853 static char *alloc_one_pg_vec_page(unsigned long order
)
3856 gfp_t gfp_flags
= GFP_KERNEL
| __GFP_COMP
|
3857 __GFP_ZERO
| __GFP_NOWARN
| __GFP_NORETRY
;
3859 buffer
= (char *) __get_free_pages(gfp_flags
, order
);
3863 /* __get_free_pages failed, fall back to vmalloc */
3864 buffer
= vzalloc((1 << order
) * PAGE_SIZE
);
3868 /* vmalloc failed, lets dig into swap here */
3869 gfp_flags
&= ~__GFP_NORETRY
;
3870 buffer
= (char *) __get_free_pages(gfp_flags
, order
);
3874 /* complete and utter failure */
3878 static struct pgv
*alloc_pg_vec(struct tpacket_req
*req
, int order
)
3880 unsigned int block_nr
= req
->tp_block_nr
;
3884 pg_vec
= kcalloc(block_nr
, sizeof(struct pgv
), GFP_KERNEL
);
3885 if (unlikely(!pg_vec
))
3888 for (i
= 0; i
< block_nr
; i
++) {
3889 pg_vec
[i
].buffer
= alloc_one_pg_vec_page(order
);
3890 if (unlikely(!pg_vec
[i
].buffer
))
3891 goto out_free_pgvec
;
3898 free_pg_vec(pg_vec
, order
, block_nr
);
3903 static int packet_set_ring(struct sock
*sk
, union tpacket_req_u
*req_u
,
3904 int closing
, int tx_ring
)
3906 struct pgv
*pg_vec
= NULL
;
3907 struct packet_sock
*po
= pkt_sk(sk
);
3908 int was_running
, order
= 0;
3909 struct packet_ring_buffer
*rb
;
3910 struct sk_buff_head
*rb_queue
;
3913 /* Added to avoid minimal code churn */
3914 struct tpacket_req
*req
= &req_u
->req
;
3916 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
3917 if (!closing
&& tx_ring
&& (po
->tp_version
> TPACKET_V2
)) {
3918 WARN(1, "Tx-ring is not supported.\n");
3922 rb
= tx_ring
? &po
->tx_ring
: &po
->rx_ring
;
3923 rb_queue
= tx_ring
? &sk
->sk_write_queue
: &sk
->sk_receive_queue
;
3927 if (atomic_read(&po
->mapped
))
3929 if (packet_read_pending(rb
))
3933 if (req
->tp_block_nr
) {
3934 /* Sanity tests and some calculations */
3936 if (unlikely(rb
->pg_vec
))
3939 switch (po
->tp_version
) {
3941 po
->tp_hdrlen
= TPACKET_HDRLEN
;
3944 po
->tp_hdrlen
= TPACKET2_HDRLEN
;
3947 po
->tp_hdrlen
= TPACKET3_HDRLEN
;
3952 if (unlikely((int)req
->tp_block_size
<= 0))
3954 if (unlikely(req
->tp_block_size
& (PAGE_SIZE
- 1)))
3956 if (po
->tp_version
>= TPACKET_V3
&&
3957 (int)(req
->tp_block_size
-
3958 BLK_PLUS_PRIV(req_u
->req3
.tp_sizeof_priv
)) <= 0)
3960 if (unlikely(req
->tp_frame_size
< po
->tp_hdrlen
+
3963 if (unlikely(req
->tp_frame_size
& (TPACKET_ALIGNMENT
- 1)))
3966 rb
->frames_per_block
= req
->tp_block_size
/req
->tp_frame_size
;
3967 if (unlikely(rb
->frames_per_block
<= 0))
3969 if (unlikely((rb
->frames_per_block
* req
->tp_block_nr
) !=
3974 order
= get_order(req
->tp_block_size
);
3975 pg_vec
= alloc_pg_vec(req
, order
);
3976 if (unlikely(!pg_vec
))
3978 switch (po
->tp_version
) {
3980 /* Transmit path is not supported. We checked
3981 * it above but just being paranoid
3984 init_prb_bdqc(po
, rb
, pg_vec
, req_u
);
3993 if (unlikely(req
->tp_frame_nr
))
3999 /* Detach socket from network */
4000 spin_lock(&po
->bind_lock
);
4001 was_running
= po
->running
;
4005 __unregister_prot_hook(sk
, false);
4007 spin_unlock(&po
->bind_lock
);
4012 mutex_lock(&po
->pg_vec_lock
);
4013 if (closing
|| atomic_read(&po
->mapped
) == 0) {
4015 spin_lock_bh(&rb_queue
->lock
);
4016 swap(rb
->pg_vec
, pg_vec
);
4017 rb
->frame_max
= (req
->tp_frame_nr
- 1);
4019 rb
->frame_size
= req
->tp_frame_size
;
4020 spin_unlock_bh(&rb_queue
->lock
);
4022 swap(rb
->pg_vec_order
, order
);
4023 swap(rb
->pg_vec_len
, req
->tp_block_nr
);
4025 rb
->pg_vec_pages
= req
->tp_block_size
/PAGE_SIZE
;
4026 po
->prot_hook
.func
= (po
->rx_ring
.pg_vec
) ?
4027 tpacket_rcv
: packet_rcv
;
4028 skb_queue_purge(rb_queue
);
4029 if (atomic_read(&po
->mapped
))
4030 pr_err("packet_mmap: vma is busy: %d\n",
4031 atomic_read(&po
->mapped
));
4033 mutex_unlock(&po
->pg_vec_lock
);
4035 spin_lock(&po
->bind_lock
);
4038 register_prot_hook(sk
);
4040 spin_unlock(&po
->bind_lock
);
4041 if (closing
&& (po
->tp_version
> TPACKET_V2
)) {
4042 /* Because we don't support block-based V3 on tx-ring */
4044 prb_shutdown_retire_blk_timer(po
, rb_queue
);
4049 free_pg_vec(pg_vec
, order
, req
->tp_block_nr
);
4054 static int packet_mmap(struct file
*file
, struct socket
*sock
,
4055 struct vm_area_struct
*vma
)
4057 struct sock
*sk
= sock
->sk
;
4058 struct packet_sock
*po
= pkt_sk(sk
);
4059 unsigned long size
, expected_size
;
4060 struct packet_ring_buffer
*rb
;
4061 unsigned long start
;
4068 mutex_lock(&po
->pg_vec_lock
);
4071 for (rb
= &po
->rx_ring
; rb
<= &po
->tx_ring
; rb
++) {
4073 expected_size
+= rb
->pg_vec_len
4079 if (expected_size
== 0)
4082 size
= vma
->vm_end
- vma
->vm_start
;
4083 if (size
!= expected_size
)
4086 start
= vma
->vm_start
;
4087 for (rb
= &po
->rx_ring
; rb
<= &po
->tx_ring
; rb
++) {
4088 if (rb
->pg_vec
== NULL
)
4091 for (i
= 0; i
< rb
->pg_vec_len
; i
++) {
4093 void *kaddr
= rb
->pg_vec
[i
].buffer
;
4096 for (pg_num
= 0; pg_num
< rb
->pg_vec_pages
; pg_num
++) {
4097 page
= pgv_to_page(kaddr
);
4098 err
= vm_insert_page(vma
, start
, page
);
4107 atomic_inc(&po
->mapped
);
4108 vma
->vm_ops
= &packet_mmap_ops
;
4112 mutex_unlock(&po
->pg_vec_lock
);
4116 static const struct proto_ops packet_ops_spkt
= {
4117 .family
= PF_PACKET
,
4118 .owner
= THIS_MODULE
,
4119 .release
= packet_release
,
4120 .bind
= packet_bind_spkt
,
4121 .connect
= sock_no_connect
,
4122 .socketpair
= sock_no_socketpair
,
4123 .accept
= sock_no_accept
,
4124 .getname
= packet_getname_spkt
,
4125 .poll
= datagram_poll
,
4126 .ioctl
= packet_ioctl
,
4127 .listen
= sock_no_listen
,
4128 .shutdown
= sock_no_shutdown
,
4129 .setsockopt
= sock_no_setsockopt
,
4130 .getsockopt
= sock_no_getsockopt
,
4131 .sendmsg
= packet_sendmsg_spkt
,
4132 .recvmsg
= packet_recvmsg
,
4133 .mmap
= sock_no_mmap
,
4134 .sendpage
= sock_no_sendpage
,
4137 static const struct proto_ops packet_ops
= {
4138 .family
= PF_PACKET
,
4139 .owner
= THIS_MODULE
,
4140 .release
= packet_release
,
4141 .bind
= packet_bind
,
4142 .connect
= sock_no_connect
,
4143 .socketpair
= sock_no_socketpair
,
4144 .accept
= sock_no_accept
,
4145 .getname
= packet_getname
,
4146 .poll
= packet_poll
,
4147 .ioctl
= packet_ioctl
,
4148 .listen
= sock_no_listen
,
4149 .shutdown
= sock_no_shutdown
,
4150 .setsockopt
= packet_setsockopt
,
4151 .getsockopt
= packet_getsockopt
,
4152 .sendmsg
= packet_sendmsg
,
4153 .recvmsg
= packet_recvmsg
,
4154 .mmap
= packet_mmap
,
4155 .sendpage
= sock_no_sendpage
,
4158 static const struct net_proto_family packet_family_ops
= {
4159 .family
= PF_PACKET
,
4160 .create
= packet_create
,
4161 .owner
= THIS_MODULE
,
4164 static struct notifier_block packet_netdev_notifier
= {
4165 .notifier_call
= packet_notifier
,
4168 #ifdef CONFIG_PROC_FS
4170 static void *packet_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4173 struct net
*net
= seq_file_net(seq
);
4176 return seq_hlist_start_head_rcu(&net
->packet
.sklist
, *pos
);
4179 static void *packet_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4181 struct net
*net
= seq_file_net(seq
);
4182 return seq_hlist_next_rcu(v
, &net
->packet
.sklist
, pos
);
4185 static void packet_seq_stop(struct seq_file
*seq
, void *v
)
4191 static int packet_seq_show(struct seq_file
*seq
, void *v
)
4193 if (v
== SEQ_START_TOKEN
)
4194 seq_puts(seq
, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4196 struct sock
*s
= sk_entry(v
);
4197 const struct packet_sock
*po
= pkt_sk(s
);
4200 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
4202 atomic_read(&s
->sk_refcnt
),
4207 atomic_read(&s
->sk_rmem_alloc
),
4208 from_kuid_munged(seq_user_ns(seq
), sock_i_uid(s
)),
4215 static const struct seq_operations packet_seq_ops
= {
4216 .start
= packet_seq_start
,
4217 .next
= packet_seq_next
,
4218 .stop
= packet_seq_stop
,
4219 .show
= packet_seq_show
,
4222 static int packet_seq_open(struct inode
*inode
, struct file
*file
)
4224 return seq_open_net(inode
, file
, &packet_seq_ops
,
4225 sizeof(struct seq_net_private
));
4228 static const struct file_operations packet_seq_fops
= {
4229 .owner
= THIS_MODULE
,
4230 .open
= packet_seq_open
,
4232 .llseek
= seq_lseek
,
4233 .release
= seq_release_net
,
4238 static int __net_init
packet_net_init(struct net
*net
)
4240 mutex_init(&net
->packet
.sklist_lock
);
4241 INIT_HLIST_HEAD(&net
->packet
.sklist
);
4243 if (!proc_create("packet", 0, net
->proc_net
, &packet_seq_fops
))
4249 static void __net_exit
packet_net_exit(struct net
*net
)
4251 remove_proc_entry("packet", net
->proc_net
);
4254 static struct pernet_operations packet_net_ops
= {
4255 .init
= packet_net_init
,
4256 .exit
= packet_net_exit
,
4260 static void __exit
packet_exit(void)
4262 unregister_netdevice_notifier(&packet_netdev_notifier
);
4263 unregister_pernet_subsys(&packet_net_ops
);
4264 sock_unregister(PF_PACKET
);
4265 proto_unregister(&packet_proto
);
4268 static int __init
packet_init(void)
4270 int rc
= proto_register(&packet_proto
, 0);
4275 sock_register(&packet_family_ops
);
4276 register_pernet_subsys(&packet_net_ops
);
4277 register_netdevice_notifier(&packet_netdev_notifier
);
4282 module_init(packet_init
);
4283 module_exit(packet_exit
);
4284 MODULE_LICENSE("GPL");
4285 MODULE_ALIAS_NETPROTO(PF_PACKET
);