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.
44 * This program is free software; you can redistribute it and/or
45 * modify it under the terms of the GNU General Public License
46 * as published by the Free Software Foundation; either version
47 * 2 of the License, or (at your option) any later version.
51 #include <linux/types.h>
53 #include <linux/capability.h>
54 #include <linux/fcntl.h>
55 #include <linux/socket.h>
57 #include <linux/inet.h>
58 #include <linux/netdevice.h>
59 #include <linux/if_packet.h>
60 #include <linux/wireless.h>
61 #include <linux/kernel.h>
62 #include <linux/kmod.h>
63 #include <net/net_namespace.h>
65 #include <net/protocol.h>
66 #include <linux/skbuff.h>
68 #include <linux/errno.h>
69 #include <linux/timer.h>
70 #include <asm/system.h>
71 #include <asm/uaccess.h>
72 #include <asm/ioctls.h>
74 #include <asm/cacheflush.h>
76 #include <linux/proc_fs.h>
77 #include <linux/seq_file.h>
78 #include <linux/poll.h>
79 #include <linux/module.h>
80 #include <linux/init.h>
81 #include <linux/mutex.h>
84 #include <net/inet_common.h>
89 - if device has no dev->hard_header routine, it adds and removes ll header
90 inside itself. In this case ll header is invisible outside of device,
91 but higher levels still should reserve dev->hard_header_len.
92 Some devices are enough clever to reallocate skb, when header
93 will not fit to reserved space (tunnel), another ones are silly
95 - packet socket receives packets with pulled ll header,
96 so that SOCK_RAW should push it back.
101 Incoming, dev->hard_header!=NULL
102 mac_header -> ll header
105 Outgoing, dev->hard_header!=NULL
106 mac_header -> ll header
109 Incoming, dev->hard_header==NULL
110 mac_header -> UNKNOWN position. It is very likely, that it points to ll
111 header. PPP makes it, that is wrong, because introduce
112 assymetry between rx and tx paths.
115 Outgoing, dev->hard_header==NULL
116 mac_header -> data. ll header is still not built!
120 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
126 dev->hard_header != NULL
127 mac_header -> ll header
130 dev->hard_header == NULL (ll header is added by device, we cannot control it)
134 We should set nh.raw on output to correct posistion,
135 packet classifier depends on it.
138 /* Private packet socket structures. */
140 struct packet_mclist
{
141 struct packet_mclist
*next
;
146 unsigned char addr
[MAX_ADDR_LEN
];
148 /* identical to struct packet_mreq except it has
149 * a longer address field.
151 struct packet_mreq_max
{
153 unsigned short mr_type
;
154 unsigned short mr_alen
;
155 unsigned char mr_address
[MAX_ADDR_LEN
];
158 #ifdef CONFIG_PACKET_MMAP
159 static int packet_set_ring(struct sock
*sk
, struct tpacket_req
*req
,
160 int closing
, int tx_ring
);
162 struct packet_ring_buffer
{
165 unsigned int frames_per_block
;
166 unsigned int frame_size
;
167 unsigned int frame_max
;
169 unsigned int pg_vec_order
;
170 unsigned int pg_vec_pages
;
171 unsigned int pg_vec_len
;
177 static int tpacket_snd(struct packet_sock
*po
, struct msghdr
*msg
);
180 static void packet_flush_mclist(struct sock
*sk
);
183 /* struct sock has to be the first member of packet_sock */
185 struct tpacket_stats stats
;
186 #ifdef CONFIG_PACKET_MMAP
187 struct packet_ring_buffer rx_ring
;
188 struct packet_ring_buffer tx_ring
;
191 struct packet_type prot_hook
;
192 spinlock_t bind_lock
;
193 struct mutex pg_vec_lock
;
194 unsigned int running
:1, /* prot_hook is attached*/
197 int ifindex
; /* bound device */
199 struct packet_mclist
*mclist
;
200 #ifdef CONFIG_PACKET_MMAP
202 enum tpacket_versions tp_version
;
203 unsigned int tp_hdrlen
;
204 unsigned int tp_reserve
;
205 unsigned int tp_loss
:1;
209 struct packet_skb_cb
{
210 unsigned int origlen
;
212 struct sockaddr_pkt pkt
;
213 struct sockaddr_ll ll
;
217 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
219 #ifdef CONFIG_PACKET_MMAP
221 static void __packet_set_status(struct packet_sock
*po
, void *frame
, int status
)
224 struct tpacket_hdr
*h1
;
225 struct tpacket2_hdr
*h2
;
230 switch (po
->tp_version
) {
232 h
.h1
->tp_status
= status
;
233 flush_dcache_page(virt_to_page(&h
.h1
->tp_status
));
236 h
.h2
->tp_status
= status
;
237 flush_dcache_page(virt_to_page(&h
.h2
->tp_status
));
240 pr_err("TPACKET version not supported\n");
247 static int __packet_get_status(struct packet_sock
*po
, void *frame
)
250 struct tpacket_hdr
*h1
;
251 struct tpacket2_hdr
*h2
;
258 switch (po
->tp_version
) {
260 flush_dcache_page(virt_to_page(&h
.h1
->tp_status
));
261 return h
.h1
->tp_status
;
263 flush_dcache_page(virt_to_page(&h
.h2
->tp_status
));
264 return h
.h2
->tp_status
;
266 pr_err("TPACKET version not supported\n");
272 static void *packet_lookup_frame(struct packet_sock
*po
,
273 struct packet_ring_buffer
*rb
,
274 unsigned int position
,
277 unsigned int pg_vec_pos
, frame_offset
;
279 struct tpacket_hdr
*h1
;
280 struct tpacket2_hdr
*h2
;
284 pg_vec_pos
= position
/ rb
->frames_per_block
;
285 frame_offset
= position
% rb
->frames_per_block
;
287 h
.raw
= rb
->pg_vec
[pg_vec_pos
] + (frame_offset
* rb
->frame_size
);
289 if (status
!= __packet_get_status(po
, h
.raw
))
295 static inline void *packet_current_frame(struct packet_sock
*po
,
296 struct packet_ring_buffer
*rb
,
299 return packet_lookup_frame(po
, rb
, rb
->head
, status
);
302 static inline void *packet_previous_frame(struct packet_sock
*po
,
303 struct packet_ring_buffer
*rb
,
306 unsigned int previous
= rb
->head
? rb
->head
- 1 : rb
->frame_max
;
307 return packet_lookup_frame(po
, rb
, previous
, status
);
310 static inline void packet_increment_head(struct packet_ring_buffer
*buff
)
312 buff
->head
= buff
->head
!= buff
->frame_max
? buff
->head
+1 : 0;
317 static inline struct packet_sock
*pkt_sk(struct sock
*sk
)
319 return (struct packet_sock
*)sk
;
322 static void packet_sock_destruct(struct sock
*sk
)
324 WARN_ON(atomic_read(&sk
->sk_rmem_alloc
));
325 WARN_ON(atomic_read(&sk
->sk_wmem_alloc
));
327 if (!sock_flag(sk
, SOCK_DEAD
)) {
328 pr_err("Attempt to release alive packet socket: %p\n", sk
);
332 sk_refcnt_debug_dec(sk
);
336 static const struct proto_ops packet_ops
;
338 static const struct proto_ops packet_ops_spkt
;
340 static int packet_rcv_spkt(struct sk_buff
*skb
, struct net_device
*dev
,
341 struct packet_type
*pt
, struct net_device
*orig_dev
)
344 struct sockaddr_pkt
*spkt
;
347 * When we registered the protocol we saved the socket in the data
348 * field for just this event.
351 sk
= pt
->af_packet_priv
;
354 * Yank back the headers [hope the device set this
355 * right or kerboom...]
357 * Incoming packets have ll header pulled,
360 * For outgoing ones skb->data == skb_mac_header(skb)
361 * so that this procedure is noop.
364 if (skb
->pkt_type
== PACKET_LOOPBACK
)
367 if (dev_net(dev
) != sock_net(sk
))
370 skb
= skb_share_check(skb
, GFP_ATOMIC
);
374 /* drop any routing info */
377 /* drop conntrack reference */
380 spkt
= &PACKET_SKB_CB(skb
)->sa
.pkt
;
382 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
385 * The SOCK_PACKET socket receives _all_ frames.
388 spkt
->spkt_family
= dev
->type
;
389 strlcpy(spkt
->spkt_device
, dev
->name
, sizeof(spkt
->spkt_device
));
390 spkt
->spkt_protocol
= skb
->protocol
;
393 * Charge the memory to the socket. This is done specifically
394 * to prevent sockets using all the memory up.
397 if (sock_queue_rcv_skb(sk
, skb
) == 0)
408 * Output a raw packet to a device layer. This bypasses all the other
409 * protocol layers and you must therefore supply it with a complete frame
412 static int packet_sendmsg_spkt(struct kiocb
*iocb
, struct socket
*sock
,
413 struct msghdr
*msg
, size_t len
)
415 struct sock
*sk
= sock
->sk
;
416 struct sockaddr_pkt
*saddr
= (struct sockaddr_pkt
*)msg
->msg_name
;
418 struct net_device
*dev
;
423 * Get and verify the address.
427 if (msg
->msg_namelen
< sizeof(struct sockaddr
))
429 if (msg
->msg_namelen
== sizeof(struct sockaddr_pkt
))
430 proto
= saddr
->spkt_protocol
;
432 return -ENOTCONN
; /* SOCK_PACKET must be sent giving an address */
435 * Find the device first to size check it
438 saddr
->spkt_device
[13] = 0;
439 dev
= dev_get_by_name(sock_net(sk
), saddr
->spkt_device
);
445 if (!(dev
->flags
& IFF_UP
))
449 * You may not queue a frame bigger than the mtu. This is the lowest level
450 * raw protocol and you must do your own fragmentation at this level.
454 if (len
> dev
->mtu
+ dev
->hard_header_len
)
458 skb
= sock_wmalloc(sk
, len
+ LL_RESERVED_SPACE(dev
), 0, GFP_KERNEL
);
461 * If the write buffer is full, then tough. At this level the user
462 * gets to deal with the problem - do your own algorithmic backoffs.
463 * That's far more flexible.
473 /* FIXME: Save some space for broken drivers that write a
474 * hard header at transmission time by themselves. PPP is the
475 * notable one here. This should really be fixed at the driver level.
477 skb_reserve(skb
, LL_RESERVED_SPACE(dev
));
478 skb_reset_network_header(skb
);
480 /* Try to align data part correctly */
481 if (dev
->header_ops
) {
482 skb
->data
-= dev
->hard_header_len
;
483 skb
->tail
-= dev
->hard_header_len
;
484 if (len
< dev
->hard_header_len
)
485 skb_reset_network_header(skb
);
488 /* Returns -EFAULT on error */
489 err
= memcpy_fromiovec(skb_put(skb
, len
), msg
->msg_iov
, len
);
490 skb
->protocol
= proto
;
492 skb
->priority
= sk
->sk_priority
;
512 static inline unsigned int run_filter(struct sk_buff
*skb
, struct sock
*sk
,
515 struct sk_filter
*filter
;
518 filter
= rcu_dereference(sk
->sk_filter
);
520 res
= sk_run_filter(skb
, filter
->insns
, filter
->len
);
521 rcu_read_unlock_bh();
527 This function makes lazy skb cloning in hope that most of packets
528 are discarded by BPF.
530 Note tricky part: we DO mangle shared skb! skb->data, skb->len
531 and skb->cb are mangled. It works because (and until) packets
532 falling here are owned by current CPU. Output packets are cloned
533 by dev_queue_xmit_nit(), input packets are processed by net_bh
534 sequencially, so that if we return skb to original state on exit,
535 we will not harm anyone.
538 static int packet_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
539 struct packet_type
*pt
, struct net_device
*orig_dev
)
542 struct sockaddr_ll
*sll
;
543 struct packet_sock
*po
;
544 u8
*skb_head
= skb
->data
;
545 int skb_len
= skb
->len
;
546 unsigned int snaplen
, res
;
548 if (skb
->pkt_type
== PACKET_LOOPBACK
)
551 sk
= pt
->af_packet_priv
;
554 if (dev_net(dev
) != sock_net(sk
))
559 if (dev
->header_ops
) {
560 /* The device has an explicit notion of ll header,
561 exported to higher levels.
563 Otherwise, the device hides datails of it frame
564 structure, so that corresponding packet head
565 never delivered to user.
567 if (sk
->sk_type
!= SOCK_DGRAM
)
568 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
569 else if (skb
->pkt_type
== PACKET_OUTGOING
) {
570 /* Special case: outgoing packets have ll header at head */
571 skb_pull(skb
, skb_network_offset(skb
));
577 res
= run_filter(skb
, sk
, snaplen
);
583 if (atomic_read(&sk
->sk_rmem_alloc
) + skb
->truesize
>=
584 (unsigned)sk
->sk_rcvbuf
)
587 if (skb_shared(skb
)) {
588 struct sk_buff
*nskb
= skb_clone(skb
, GFP_ATOMIC
);
592 if (skb_head
!= skb
->data
) {
593 skb
->data
= skb_head
;
600 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb
)) + MAX_ADDR_LEN
- 8 >
603 sll
= &PACKET_SKB_CB(skb
)->sa
.ll
;
604 sll
->sll_family
= AF_PACKET
;
605 sll
->sll_hatype
= dev
->type
;
606 sll
->sll_protocol
= skb
->protocol
;
607 sll
->sll_pkttype
= skb
->pkt_type
;
608 if (unlikely(po
->origdev
))
609 sll
->sll_ifindex
= orig_dev
->ifindex
;
611 sll
->sll_ifindex
= dev
->ifindex
;
613 sll
->sll_halen
= dev_parse_header(skb
, sll
->sll_addr
);
615 PACKET_SKB_CB(skb
)->origlen
= skb
->len
;
617 if (pskb_trim(skb
, snaplen
))
620 skb_set_owner_r(skb
, sk
);
624 /* drop conntrack reference */
627 spin_lock(&sk
->sk_receive_queue
.lock
);
628 po
->stats
.tp_packets
++;
629 __skb_queue_tail(&sk
->sk_receive_queue
, skb
);
630 spin_unlock(&sk
->sk_receive_queue
.lock
);
631 sk
->sk_data_ready(sk
, skb
->len
);
635 spin_lock(&sk
->sk_receive_queue
.lock
);
636 po
->stats
.tp_drops
++;
637 spin_unlock(&sk
->sk_receive_queue
.lock
);
640 if (skb_head
!= skb
->data
&& skb_shared(skb
)) {
641 skb
->data
= skb_head
;
649 #ifdef CONFIG_PACKET_MMAP
650 static int tpacket_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
651 struct packet_type
*pt
, struct net_device
*orig_dev
)
654 struct packet_sock
*po
;
655 struct sockaddr_ll
*sll
;
657 struct tpacket_hdr
*h1
;
658 struct tpacket2_hdr
*h2
;
661 u8
*skb_head
= skb
->data
;
662 int skb_len
= skb
->len
;
663 unsigned int snaplen
, res
;
664 unsigned long status
= TP_STATUS_LOSING
|TP_STATUS_USER
;
665 unsigned short macoff
, netoff
, hdrlen
;
666 struct sk_buff
*copy_skb
= NULL
;
670 if (skb
->pkt_type
== PACKET_LOOPBACK
)
673 sk
= pt
->af_packet_priv
;
676 if (dev_net(dev
) != sock_net(sk
))
679 if (dev
->header_ops
) {
680 if (sk
->sk_type
!= SOCK_DGRAM
)
681 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
682 else if (skb
->pkt_type
== PACKET_OUTGOING
) {
683 /* Special case: outgoing packets have ll header at head */
684 skb_pull(skb
, skb_network_offset(skb
));
688 if (skb
->ip_summed
== CHECKSUM_PARTIAL
)
689 status
|= TP_STATUS_CSUMNOTREADY
;
693 res
= run_filter(skb
, sk
, snaplen
);
699 if (sk
->sk_type
== SOCK_DGRAM
) {
700 macoff
= netoff
= TPACKET_ALIGN(po
->tp_hdrlen
) + 16 +
703 unsigned maclen
= skb_network_offset(skb
);
704 netoff
= TPACKET_ALIGN(po
->tp_hdrlen
+
705 (maclen
< 16 ? 16 : maclen
)) +
707 macoff
= netoff
- maclen
;
710 if (macoff
+ snaplen
> po
->rx_ring
.frame_size
) {
711 if (po
->copy_thresh
&&
712 atomic_read(&sk
->sk_rmem_alloc
) + skb
->truesize
<
713 (unsigned)sk
->sk_rcvbuf
) {
714 if (skb_shared(skb
)) {
715 copy_skb
= skb_clone(skb
, GFP_ATOMIC
);
717 copy_skb
= skb_get(skb
);
718 skb_head
= skb
->data
;
721 skb_set_owner_r(copy_skb
, sk
);
723 snaplen
= po
->rx_ring
.frame_size
- macoff
;
724 if ((int)snaplen
< 0)
728 spin_lock(&sk
->sk_receive_queue
.lock
);
729 h
.raw
= packet_current_frame(po
, &po
->rx_ring
, TP_STATUS_KERNEL
);
732 packet_increment_head(&po
->rx_ring
);
733 po
->stats
.tp_packets
++;
735 status
|= TP_STATUS_COPY
;
736 __skb_queue_tail(&sk
->sk_receive_queue
, copy_skb
);
738 if (!po
->stats
.tp_drops
)
739 status
&= ~TP_STATUS_LOSING
;
740 spin_unlock(&sk
->sk_receive_queue
.lock
);
742 skb_copy_bits(skb
, 0, h
.raw
+ macoff
, snaplen
);
744 switch (po
->tp_version
) {
746 h
.h1
->tp_len
= skb
->len
;
747 h
.h1
->tp_snaplen
= snaplen
;
748 h
.h1
->tp_mac
= macoff
;
749 h
.h1
->tp_net
= netoff
;
750 if (skb
->tstamp
.tv64
)
751 tv
= ktime_to_timeval(skb
->tstamp
);
753 do_gettimeofday(&tv
);
754 h
.h1
->tp_sec
= tv
.tv_sec
;
755 h
.h1
->tp_usec
= tv
.tv_usec
;
756 hdrlen
= sizeof(*h
.h1
);
759 h
.h2
->tp_len
= skb
->len
;
760 h
.h2
->tp_snaplen
= snaplen
;
761 h
.h2
->tp_mac
= macoff
;
762 h
.h2
->tp_net
= netoff
;
763 if (skb
->tstamp
.tv64
)
764 ts
= ktime_to_timespec(skb
->tstamp
);
767 h
.h2
->tp_sec
= ts
.tv_sec
;
768 h
.h2
->tp_nsec
= ts
.tv_nsec
;
769 h
.h2
->tp_vlan_tci
= skb
->vlan_tci
;
770 hdrlen
= sizeof(*h
.h2
);
776 sll
= h
.raw
+ TPACKET_ALIGN(hdrlen
);
777 sll
->sll_halen
= dev_parse_header(skb
, sll
->sll_addr
);
778 sll
->sll_family
= AF_PACKET
;
779 sll
->sll_hatype
= dev
->type
;
780 sll
->sll_protocol
= skb
->protocol
;
781 sll
->sll_pkttype
= skb
->pkt_type
;
782 if (unlikely(po
->origdev
))
783 sll
->sll_ifindex
= orig_dev
->ifindex
;
785 sll
->sll_ifindex
= dev
->ifindex
;
787 __packet_set_status(po
, h
.raw
, status
);
790 struct page
*p_start
, *p_end
;
791 u8
*h_end
= h
.raw
+ macoff
+ snaplen
- 1;
793 p_start
= virt_to_page(h
.raw
);
794 p_end
= virt_to_page(h_end
);
795 while (p_start
<= p_end
) {
796 flush_dcache_page(p_start
);
801 sk
->sk_data_ready(sk
, 0);
804 if (skb_head
!= skb
->data
&& skb_shared(skb
)) {
805 skb
->data
= skb_head
;
813 po
->stats
.tp_drops
++;
814 spin_unlock(&sk
->sk_receive_queue
.lock
);
816 sk
->sk_data_ready(sk
, 0);
821 static void tpacket_destruct_skb(struct sk_buff
*skb
)
823 struct packet_sock
*po
= pkt_sk(skb
->sk
);
828 if (likely(po
->tx_ring
.pg_vec
)) {
829 ph
= skb_shinfo(skb
)->destructor_arg
;
830 BUG_ON(__packet_get_status(po
, ph
) != TP_STATUS_SENDING
);
831 BUG_ON(atomic_read(&po
->tx_ring
.pending
) == 0);
832 atomic_dec(&po
->tx_ring
.pending
);
833 __packet_set_status(po
, ph
, TP_STATUS_AVAILABLE
);
839 static int tpacket_fill_skb(struct packet_sock
*po
, struct sk_buff
*skb
,
840 void *frame
, struct net_device
*dev
, int size_max
,
841 __be16 proto
, unsigned char *addr
)
844 struct tpacket_hdr
*h1
;
845 struct tpacket2_hdr
*h2
;
848 int to_write
, offset
, len
, tp_len
, nr_frags
, len_max
;
849 struct socket
*sock
= po
->sk
.sk_socket
;
856 skb
->protocol
= proto
;
858 skb
->priority
= po
->sk
.sk_priority
;
859 skb_shinfo(skb
)->destructor_arg
= ph
.raw
;
861 switch (po
->tp_version
) {
863 tp_len
= ph
.h2
->tp_len
;
866 tp_len
= ph
.h1
->tp_len
;
869 if (unlikely(tp_len
> size_max
)) {
870 pr_err("packet size is too long (%d > %d)\n", tp_len
, size_max
);
874 skb_reserve(skb
, LL_RESERVED_SPACE(dev
));
875 skb_reset_network_header(skb
);
877 data
= ph
.raw
+ po
->tp_hdrlen
- sizeof(struct sockaddr_ll
);
880 if (sock
->type
== SOCK_DGRAM
) {
881 err
= dev_hard_header(skb
, dev
, ntohs(proto
), addr
,
883 if (unlikely(err
< 0))
885 } else if (dev
->hard_header_len
) {
886 /* net device doesn't like empty head */
887 if (unlikely(tp_len
<= dev
->hard_header_len
)) {
888 pr_err("packet size is too short (%d < %d)\n",
889 tp_len
, dev
->hard_header_len
);
893 skb_push(skb
, dev
->hard_header_len
);
894 err
= skb_store_bits(skb
, 0, data
,
895 dev
->hard_header_len
);
899 data
+= dev
->hard_header_len
;
900 to_write
-= dev
->hard_header_len
;
904 page
= virt_to_page(data
);
905 offset
= offset_in_page(data
);
906 len_max
= PAGE_SIZE
- offset
;
907 len
= ((to_write
> len_max
) ? len_max
: to_write
);
909 skb
->data_len
= to_write
;
910 skb
->len
+= to_write
;
911 skb
->truesize
+= to_write
;
912 atomic_add(to_write
, &po
->sk
.sk_wmem_alloc
);
914 while (likely(to_write
)) {
915 nr_frags
= skb_shinfo(skb
)->nr_frags
;
917 if (unlikely(nr_frags
>= MAX_SKB_FRAGS
)) {
918 pr_err("Packet exceed the number of skb frags(%lu)\n",
923 flush_dcache_page(page
);
925 skb_fill_page_desc(skb
,
927 page
++, offset
, len
);
931 len
= ((to_write
> len_max
) ? len_max
: to_write
);
937 static int tpacket_snd(struct packet_sock
*po
, struct msghdr
*msg
)
941 struct net_device
*dev
;
943 int ifindex
, err
, reserve
= 0;
945 struct sockaddr_ll
*saddr
= (struct sockaddr_ll
*)msg
->msg_name
;
946 int tp_len
, size_max
;
951 sock
= po
->sk
.sk_socket
;
953 mutex_lock(&po
->pg_vec_lock
);
957 ifindex
= po
->ifindex
;
962 if (msg
->msg_namelen
< sizeof(struct sockaddr_ll
))
964 if (msg
->msg_namelen
< (saddr
->sll_halen
965 + offsetof(struct sockaddr_ll
,
968 ifindex
= saddr
->sll_ifindex
;
969 proto
= saddr
->sll_protocol
;
970 addr
= saddr
->sll_addr
;
973 dev
= dev_get_by_index(sock_net(&po
->sk
), ifindex
);
975 if (unlikely(dev
== NULL
))
978 reserve
= dev
->hard_header_len
;
981 if (unlikely(!(dev
->flags
& IFF_UP
)))
984 size_max
= po
->tx_ring
.frame_size
985 - (po
->tp_hdrlen
- sizeof(struct sockaddr_ll
));
987 if (size_max
> dev
->mtu
+ reserve
)
988 size_max
= dev
->mtu
+ reserve
;
991 ph
= packet_current_frame(po
, &po
->tx_ring
,
992 TP_STATUS_SEND_REQUEST
);
994 if (unlikely(ph
== NULL
)) {
999 status
= TP_STATUS_SEND_REQUEST
;
1000 skb
= sock_alloc_send_skb(&po
->sk
,
1001 LL_ALLOCATED_SPACE(dev
)
1002 + sizeof(struct sockaddr_ll
),
1005 if (unlikely(skb
== NULL
))
1008 tp_len
= tpacket_fill_skb(po
, skb
, ph
, dev
, size_max
, proto
,
1011 if (unlikely(tp_len
< 0)) {
1013 __packet_set_status(po
, ph
,
1014 TP_STATUS_AVAILABLE
);
1015 packet_increment_head(&po
->tx_ring
);
1019 status
= TP_STATUS_WRONG_FORMAT
;
1025 skb
->destructor
= tpacket_destruct_skb
;
1026 __packet_set_status(po
, ph
, TP_STATUS_SENDING
);
1027 atomic_inc(&po
->tx_ring
.pending
);
1029 status
= TP_STATUS_SEND_REQUEST
;
1030 err
= dev_queue_xmit(skb
);
1031 if (unlikely(err
> 0 && (err
= net_xmit_errno(err
)) != 0))
1033 packet_increment_head(&po
->tx_ring
);
1035 } while (likely((ph
!= NULL
) || ((!(msg
->msg_flags
& MSG_DONTWAIT
))
1036 && (atomic_read(&po
->tx_ring
.pending
))))
1043 skb
->destructor
= sock_wfree
;
1044 atomic_dec(&po
->tx_ring
.pending
);
1046 __packet_set_status(po
, ph
, status
);
1051 mutex_unlock(&po
->pg_vec_lock
);
1056 static int packet_snd(struct socket
*sock
,
1057 struct msghdr
*msg
, size_t len
)
1059 struct sock
*sk
= sock
->sk
;
1060 struct sockaddr_ll
*saddr
= (struct sockaddr_ll
*)msg
->msg_name
;
1061 struct sk_buff
*skb
;
1062 struct net_device
*dev
;
1064 unsigned char *addr
;
1065 int ifindex
, err
, reserve
= 0;
1068 * Get and verify the address.
1071 if (saddr
== NULL
) {
1072 struct packet_sock
*po
= pkt_sk(sk
);
1074 ifindex
= po
->ifindex
;
1079 if (msg
->msg_namelen
< sizeof(struct sockaddr_ll
))
1081 if (msg
->msg_namelen
< (saddr
->sll_halen
+ offsetof(struct sockaddr_ll
, sll_addr
)))
1083 ifindex
= saddr
->sll_ifindex
;
1084 proto
= saddr
->sll_protocol
;
1085 addr
= saddr
->sll_addr
;
1089 dev
= dev_get_by_index(sock_net(sk
), ifindex
);
1093 if (sock
->type
== SOCK_RAW
)
1094 reserve
= dev
->hard_header_len
;
1097 if (!(dev
->flags
& IFF_UP
))
1101 if (len
> dev
->mtu
+reserve
)
1104 skb
= sock_alloc_send_skb(sk
, len
+ LL_ALLOCATED_SPACE(dev
),
1105 msg
->msg_flags
& MSG_DONTWAIT
, &err
);
1109 skb_reserve(skb
, LL_RESERVED_SPACE(dev
));
1110 skb_reset_network_header(skb
);
1113 if (sock
->type
== SOCK_DGRAM
&&
1114 dev_hard_header(skb
, dev
, ntohs(proto
), addr
, NULL
, len
) < 0)
1117 /* Returns -EFAULT on error */
1118 err
= memcpy_fromiovec(skb_put(skb
, len
), msg
->msg_iov
, len
);
1122 skb
->protocol
= proto
;
1124 skb
->priority
= sk
->sk_priority
;
1130 err
= dev_queue_xmit(skb
);
1131 if (err
> 0 && (err
= net_xmit_errno(err
)) != 0)
1147 static int packet_sendmsg(struct kiocb
*iocb
, struct socket
*sock
,
1148 struct msghdr
*msg
, size_t len
)
1150 #ifdef CONFIG_PACKET_MMAP
1151 struct sock
*sk
= sock
->sk
;
1152 struct packet_sock
*po
= pkt_sk(sk
);
1153 if (po
->tx_ring
.pg_vec
)
1154 return tpacket_snd(po
, msg
);
1157 return packet_snd(sock
, msg
, len
);
1161 * Close a PACKET socket. This is fairly simple. We immediately go
1162 * to 'closed' state and remove our protocol entry in the device list.
1165 static int packet_release(struct socket
*sock
)
1167 struct sock
*sk
= sock
->sk
;
1168 struct packet_sock
*po
;
1170 #ifdef CONFIG_PACKET_MMAP
1171 struct tpacket_req req
;
1180 write_lock_bh(&net
->packet
.sklist_lock
);
1181 sk_del_node_init(sk
);
1182 sock_prot_inuse_add(net
, sk
->sk_prot
, -1);
1183 write_unlock_bh(&net
->packet
.sklist_lock
);
1186 * Unhook packet receive handler.
1191 * Remove the protocol hook
1193 dev_remove_pack(&po
->prot_hook
);
1199 packet_flush_mclist(sk
);
1201 #ifdef CONFIG_PACKET_MMAP
1202 memset(&req
, 0, sizeof(req
));
1204 if (po
->rx_ring
.pg_vec
)
1205 packet_set_ring(sk
, &req
, 1, 0);
1207 if (po
->tx_ring
.pg_vec
)
1208 packet_set_ring(sk
, &req
, 1, 1);
1212 * Now the socket is dead. No more input will appear.
1220 skb_queue_purge(&sk
->sk_receive_queue
);
1221 sk_refcnt_debug_release(sk
);
1228 * Attach a packet hook.
1231 static int packet_do_bind(struct sock
*sk
, struct net_device
*dev
, __be16 protocol
)
1233 struct packet_sock
*po
= pkt_sk(sk
);
1235 * Detach an existing hook if present.
1240 spin_lock(&po
->bind_lock
);
1245 spin_unlock(&po
->bind_lock
);
1246 dev_remove_pack(&po
->prot_hook
);
1247 spin_lock(&po
->bind_lock
);
1251 po
->prot_hook
.type
= protocol
;
1252 po
->prot_hook
.dev
= dev
;
1254 po
->ifindex
= dev
? dev
->ifindex
: 0;
1259 if (!dev
|| (dev
->flags
& IFF_UP
)) {
1260 dev_add_pack(&po
->prot_hook
);
1264 sk
->sk_err
= ENETDOWN
;
1265 if (!sock_flag(sk
, SOCK_DEAD
))
1266 sk
->sk_error_report(sk
);
1270 spin_unlock(&po
->bind_lock
);
1276 * Bind a packet socket to a device
1279 static int packet_bind_spkt(struct socket
*sock
, struct sockaddr
*uaddr
,
1282 struct sock
*sk
= sock
->sk
;
1284 struct net_device
*dev
;
1291 if (addr_len
!= sizeof(struct sockaddr
))
1293 strlcpy(name
, uaddr
->sa_data
, sizeof(name
));
1295 dev
= dev_get_by_name(sock_net(sk
), name
);
1297 err
= packet_do_bind(sk
, dev
, pkt_sk(sk
)->num
);
1303 static int packet_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
)
1305 struct sockaddr_ll
*sll
= (struct sockaddr_ll
*)uaddr
;
1306 struct sock
*sk
= sock
->sk
;
1307 struct net_device
*dev
= NULL
;
1315 if (addr_len
< sizeof(struct sockaddr_ll
))
1317 if (sll
->sll_family
!= AF_PACKET
)
1320 if (sll
->sll_ifindex
) {
1322 dev
= dev_get_by_index(sock_net(sk
), sll
->sll_ifindex
);
1326 err
= packet_do_bind(sk
, dev
, sll
->sll_protocol
? : pkt_sk(sk
)->num
);
1334 static struct proto packet_proto
= {
1336 .owner
= THIS_MODULE
,
1337 .obj_size
= sizeof(struct packet_sock
),
1341 * Create a packet of type SOCK_PACKET.
1344 static int packet_create(struct net
*net
, struct socket
*sock
, int protocol
)
1347 struct packet_sock
*po
;
1348 __be16 proto
= (__force __be16
)protocol
; /* weird, but documented */
1351 if (!capable(CAP_NET_RAW
))
1353 if (sock
->type
!= SOCK_DGRAM
&& sock
->type
!= SOCK_RAW
&&
1354 sock
->type
!= SOCK_PACKET
)
1355 return -ESOCKTNOSUPPORT
;
1357 sock
->state
= SS_UNCONNECTED
;
1360 sk
= sk_alloc(net
, PF_PACKET
, GFP_KERNEL
, &packet_proto
);
1364 sock
->ops
= &packet_ops
;
1365 if (sock
->type
== SOCK_PACKET
)
1366 sock
->ops
= &packet_ops_spkt
;
1368 sock_init_data(sock
, sk
);
1371 sk
->sk_family
= PF_PACKET
;
1374 sk
->sk_destruct
= packet_sock_destruct
;
1375 sk_refcnt_debug_inc(sk
);
1378 * Attach a protocol block
1381 spin_lock_init(&po
->bind_lock
);
1382 mutex_init(&po
->pg_vec_lock
);
1383 po
->prot_hook
.func
= packet_rcv
;
1385 if (sock
->type
== SOCK_PACKET
)
1386 po
->prot_hook
.func
= packet_rcv_spkt
;
1388 po
->prot_hook
.af_packet_priv
= sk
;
1391 po
->prot_hook
.type
= proto
;
1392 dev_add_pack(&po
->prot_hook
);
1397 write_lock_bh(&net
->packet
.sklist_lock
);
1398 sk_add_node(sk
, &net
->packet
.sklist
);
1399 sock_prot_inuse_add(net
, &packet_proto
, 1);
1400 write_unlock_bh(&net
->packet
.sklist_lock
);
1407 * Pull a packet from our receive queue and hand it to the user.
1408 * If necessary we block.
1411 static int packet_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
1412 struct msghdr
*msg
, size_t len
, int flags
)
1414 struct sock
*sk
= sock
->sk
;
1415 struct sk_buff
*skb
;
1417 struct sockaddr_ll
*sll
;
1420 if (flags
& ~(MSG_PEEK
|MSG_DONTWAIT
|MSG_TRUNC
|MSG_CMSG_COMPAT
))
1424 /* What error should we return now? EUNATTACH? */
1425 if (pkt_sk(sk
)->ifindex
< 0)
1430 * Call the generic datagram receiver. This handles all sorts
1431 * of horrible races and re-entrancy so we can forget about it
1432 * in the protocol layers.
1434 * Now it will return ENETDOWN, if device have just gone down,
1435 * but then it will block.
1438 skb
= skb_recv_datagram(sk
, flags
, flags
& MSG_DONTWAIT
, &err
);
1441 * An error occurred so return it. Because skb_recv_datagram()
1442 * handles the blocking we don't see and worry about blocking
1450 * If the address length field is there to be filled in, we fill
1454 sll
= &PACKET_SKB_CB(skb
)->sa
.ll
;
1455 if (sock
->type
== SOCK_PACKET
)
1456 msg
->msg_namelen
= sizeof(struct sockaddr_pkt
);
1458 msg
->msg_namelen
= sll
->sll_halen
+ offsetof(struct sockaddr_ll
, sll_addr
);
1461 * You lose any data beyond the buffer you gave. If it worries a
1462 * user program they can ask the device for its MTU anyway.
1468 msg
->msg_flags
|= MSG_TRUNC
;
1471 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1475 sock_recv_timestamp(msg
, sk
, skb
);
1478 memcpy(msg
->msg_name
, &PACKET_SKB_CB(skb
)->sa
,
1481 if (pkt_sk(sk
)->auxdata
) {
1482 struct tpacket_auxdata aux
;
1484 aux
.tp_status
= TP_STATUS_USER
;
1485 if (skb
->ip_summed
== CHECKSUM_PARTIAL
)
1486 aux
.tp_status
|= TP_STATUS_CSUMNOTREADY
;
1487 aux
.tp_len
= PACKET_SKB_CB(skb
)->origlen
;
1488 aux
.tp_snaplen
= skb
->len
;
1490 aux
.tp_net
= skb_network_offset(skb
);
1491 aux
.tp_vlan_tci
= skb
->vlan_tci
;
1493 put_cmsg(msg
, SOL_PACKET
, PACKET_AUXDATA
, sizeof(aux
), &aux
);
1497 * Free or return the buffer as appropriate. Again this
1498 * hides all the races and re-entrancy issues from us.
1500 err
= (flags
&MSG_TRUNC
) ? skb
->len
: copied
;
1503 skb_free_datagram(sk
, skb
);
1508 static int packet_getname_spkt(struct socket
*sock
, struct sockaddr
*uaddr
,
1509 int *uaddr_len
, int peer
)
1511 struct net_device
*dev
;
1512 struct sock
*sk
= sock
->sk
;
1517 uaddr
->sa_family
= AF_PACKET
;
1518 dev
= dev_get_by_index(sock_net(sk
), pkt_sk(sk
)->ifindex
);
1520 strlcpy(uaddr
->sa_data
, dev
->name
, 15);
1523 memset(uaddr
->sa_data
, 0, 14);
1524 *uaddr_len
= sizeof(*uaddr
);
1529 static int packet_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
1530 int *uaddr_len
, int peer
)
1532 struct net_device
*dev
;
1533 struct sock
*sk
= sock
->sk
;
1534 struct packet_sock
*po
= pkt_sk(sk
);
1535 struct sockaddr_ll
*sll
= (struct sockaddr_ll
*)uaddr
;
1540 sll
->sll_family
= AF_PACKET
;
1541 sll
->sll_ifindex
= po
->ifindex
;
1542 sll
->sll_protocol
= po
->num
;
1543 dev
= dev_get_by_index(sock_net(sk
), po
->ifindex
);
1545 sll
->sll_hatype
= dev
->type
;
1546 sll
->sll_halen
= dev
->addr_len
;
1547 memcpy(sll
->sll_addr
, dev
->dev_addr
, dev
->addr_len
);
1550 sll
->sll_hatype
= 0; /* Bad: we have no ARPHRD_UNSPEC */
1553 *uaddr_len
= offsetof(struct sockaddr_ll
, sll_addr
) + sll
->sll_halen
;
1558 static int packet_dev_mc(struct net_device
*dev
, struct packet_mclist
*i
,
1562 case PACKET_MR_MULTICAST
:
1564 return dev_mc_add(dev
, i
->addr
, i
->alen
, 0);
1566 return dev_mc_delete(dev
, i
->addr
, i
->alen
, 0);
1568 case PACKET_MR_PROMISC
:
1569 return dev_set_promiscuity(dev
, what
);
1571 case PACKET_MR_ALLMULTI
:
1572 return dev_set_allmulti(dev
, what
);
1574 case PACKET_MR_UNICAST
:
1576 return dev_unicast_add(dev
, i
->addr
);
1578 return dev_unicast_delete(dev
, i
->addr
);
1586 static void packet_dev_mclist(struct net_device
*dev
, struct packet_mclist
*i
, int what
)
1588 for ( ; i
; i
= i
->next
) {
1589 if (i
->ifindex
== dev
->ifindex
)
1590 packet_dev_mc(dev
, i
, what
);
1594 static int packet_mc_add(struct sock
*sk
, struct packet_mreq_max
*mreq
)
1596 struct packet_sock
*po
= pkt_sk(sk
);
1597 struct packet_mclist
*ml
, *i
;
1598 struct net_device
*dev
;
1604 dev
= __dev_get_by_index(sock_net(sk
), mreq
->mr_ifindex
);
1609 if (mreq
->mr_alen
> dev
->addr_len
)
1613 i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
1618 for (ml
= po
->mclist
; ml
; ml
= ml
->next
) {
1619 if (ml
->ifindex
== mreq
->mr_ifindex
&&
1620 ml
->type
== mreq
->mr_type
&&
1621 ml
->alen
== mreq
->mr_alen
&&
1622 memcmp(ml
->addr
, mreq
->mr_address
, ml
->alen
) == 0) {
1624 /* Free the new element ... */
1630 i
->type
= mreq
->mr_type
;
1631 i
->ifindex
= mreq
->mr_ifindex
;
1632 i
->alen
= mreq
->mr_alen
;
1633 memcpy(i
->addr
, mreq
->mr_address
, i
->alen
);
1635 i
->next
= po
->mclist
;
1637 err
= packet_dev_mc(dev
, i
, 1);
1639 po
->mclist
= i
->next
;
1648 static int packet_mc_drop(struct sock
*sk
, struct packet_mreq_max
*mreq
)
1650 struct packet_mclist
*ml
, **mlp
;
1654 for (mlp
= &pkt_sk(sk
)->mclist
; (ml
= *mlp
) != NULL
; mlp
= &ml
->next
) {
1655 if (ml
->ifindex
== mreq
->mr_ifindex
&&
1656 ml
->type
== mreq
->mr_type
&&
1657 ml
->alen
== mreq
->mr_alen
&&
1658 memcmp(ml
->addr
, mreq
->mr_address
, ml
->alen
) == 0) {
1659 if (--ml
->count
== 0) {
1660 struct net_device
*dev
;
1662 dev
= dev_get_by_index(sock_net(sk
), ml
->ifindex
);
1664 packet_dev_mc(dev
, ml
, -1);
1674 return -EADDRNOTAVAIL
;
1677 static void packet_flush_mclist(struct sock
*sk
)
1679 struct packet_sock
*po
= pkt_sk(sk
);
1680 struct packet_mclist
*ml
;
1686 while ((ml
= po
->mclist
) != NULL
) {
1687 struct net_device
*dev
;
1689 po
->mclist
= ml
->next
;
1690 dev
= dev_get_by_index(sock_net(sk
), ml
->ifindex
);
1692 packet_dev_mc(dev
, ml
, -1);
1701 packet_setsockopt(struct socket
*sock
, int level
, int optname
, char __user
*optval
, unsigned int optlen
)
1703 struct sock
*sk
= sock
->sk
;
1704 struct packet_sock
*po
= pkt_sk(sk
);
1707 if (level
!= SOL_PACKET
)
1708 return -ENOPROTOOPT
;
1711 case PACKET_ADD_MEMBERSHIP
:
1712 case PACKET_DROP_MEMBERSHIP
:
1714 struct packet_mreq_max mreq
;
1716 memset(&mreq
, 0, sizeof(mreq
));
1717 if (len
< sizeof(struct packet_mreq
))
1719 if (len
> sizeof(mreq
))
1721 if (copy_from_user(&mreq
, optval
, len
))
1723 if (len
< (mreq
.mr_alen
+ offsetof(struct packet_mreq
, mr_address
)))
1725 if (optname
== PACKET_ADD_MEMBERSHIP
)
1726 ret
= packet_mc_add(sk
, &mreq
);
1728 ret
= packet_mc_drop(sk
, &mreq
);
1732 #ifdef CONFIG_PACKET_MMAP
1733 case PACKET_RX_RING
:
1734 case PACKET_TX_RING
:
1736 struct tpacket_req req
;
1738 if (optlen
< sizeof(req
))
1740 if (copy_from_user(&req
, optval
, sizeof(req
)))
1742 return packet_set_ring(sk
, &req
, 0, optname
== PACKET_TX_RING
);
1744 case PACKET_COPY_THRESH
:
1748 if (optlen
!= sizeof(val
))
1750 if (copy_from_user(&val
, optval
, sizeof(val
)))
1753 pkt_sk(sk
)->copy_thresh
= val
;
1756 case PACKET_VERSION
:
1760 if (optlen
!= sizeof(val
))
1762 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
1764 if (copy_from_user(&val
, optval
, sizeof(val
)))
1769 po
->tp_version
= val
;
1775 case PACKET_RESERVE
:
1779 if (optlen
!= sizeof(val
))
1781 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
1783 if (copy_from_user(&val
, optval
, sizeof(val
)))
1785 po
->tp_reserve
= val
;
1792 if (optlen
!= sizeof(val
))
1794 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
1796 if (copy_from_user(&val
, optval
, sizeof(val
)))
1798 po
->tp_loss
= !!val
;
1802 case PACKET_AUXDATA
:
1806 if (optlen
< sizeof(val
))
1808 if (copy_from_user(&val
, optval
, sizeof(val
)))
1811 po
->auxdata
= !!val
;
1814 case PACKET_ORIGDEV
:
1818 if (optlen
< sizeof(val
))
1820 if (copy_from_user(&val
, optval
, sizeof(val
)))
1823 po
->origdev
= !!val
;
1827 return -ENOPROTOOPT
;
1831 static int packet_getsockopt(struct socket
*sock
, int level
, int optname
,
1832 char __user
*optval
, int __user
*optlen
)
1836 struct sock
*sk
= sock
->sk
;
1837 struct packet_sock
*po
= pkt_sk(sk
);
1839 struct tpacket_stats st
;
1841 if (level
!= SOL_PACKET
)
1842 return -ENOPROTOOPT
;
1844 if (get_user(len
, optlen
))
1851 case PACKET_STATISTICS
:
1852 if (len
> sizeof(struct tpacket_stats
))
1853 len
= sizeof(struct tpacket_stats
);
1854 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
1856 memset(&po
->stats
, 0, sizeof(st
));
1857 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
1858 st
.tp_packets
+= st
.tp_drops
;
1862 case PACKET_AUXDATA
:
1863 if (len
> sizeof(int))
1869 case PACKET_ORIGDEV
:
1870 if (len
> sizeof(int))
1876 #ifdef CONFIG_PACKET_MMAP
1877 case PACKET_VERSION
:
1878 if (len
> sizeof(int))
1880 val
= po
->tp_version
;
1884 if (len
> sizeof(int))
1886 if (copy_from_user(&val
, optval
, len
))
1890 val
= sizeof(struct tpacket_hdr
);
1893 val
= sizeof(struct tpacket2_hdr
);
1900 case PACKET_RESERVE
:
1901 if (len
> sizeof(unsigned int))
1902 len
= sizeof(unsigned int);
1903 val
= po
->tp_reserve
;
1907 if (len
> sizeof(unsigned int))
1908 len
= sizeof(unsigned int);
1914 return -ENOPROTOOPT
;
1917 if (put_user(len
, optlen
))
1919 if (copy_to_user(optval
, data
, len
))
1925 static int packet_notifier(struct notifier_block
*this, unsigned long msg
, void *data
)
1928 struct hlist_node
*node
;
1929 struct net_device
*dev
= data
;
1930 struct net
*net
= dev_net(dev
);
1932 read_lock(&net
->packet
.sklist_lock
);
1933 sk_for_each(sk
, node
, &net
->packet
.sklist
) {
1934 struct packet_sock
*po
= pkt_sk(sk
);
1937 case NETDEV_UNREGISTER
:
1939 packet_dev_mclist(dev
, po
->mclist
, -1);
1943 if (dev
->ifindex
== po
->ifindex
) {
1944 spin_lock(&po
->bind_lock
);
1946 __dev_remove_pack(&po
->prot_hook
);
1949 sk
->sk_err
= ENETDOWN
;
1950 if (!sock_flag(sk
, SOCK_DEAD
))
1951 sk
->sk_error_report(sk
);
1953 if (msg
== NETDEV_UNREGISTER
) {
1955 po
->prot_hook
.dev
= NULL
;
1957 spin_unlock(&po
->bind_lock
);
1961 spin_lock(&po
->bind_lock
);
1962 if (dev
->ifindex
== po
->ifindex
&& po
->num
&&
1964 dev_add_pack(&po
->prot_hook
);
1968 spin_unlock(&po
->bind_lock
);
1972 read_unlock(&net
->packet
.sklist_lock
);
1977 static int packet_ioctl(struct socket
*sock
, unsigned int cmd
,
1980 struct sock
*sk
= sock
->sk
;
1985 int amount
= sk_wmem_alloc_get(sk
);
1987 return put_user(amount
, (int __user
*)arg
);
1991 struct sk_buff
*skb
;
1994 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
1995 skb
= skb_peek(&sk
->sk_receive_queue
);
1998 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
1999 return put_user(amount
, (int __user
*)arg
);
2002 return sock_get_timestamp(sk
, (struct timeval __user
*)arg
);
2004 return sock_get_timestampns(sk
, (struct timespec __user
*)arg
);
2014 case SIOCGIFBRDADDR
:
2015 case SIOCSIFBRDADDR
:
2016 case SIOCGIFNETMASK
:
2017 case SIOCSIFNETMASK
:
2018 case SIOCGIFDSTADDR
:
2019 case SIOCSIFDSTADDR
:
2021 if (!net_eq(sock_net(sk
), &init_net
))
2022 return -ENOIOCTLCMD
;
2023 return inet_dgram_ops
.ioctl(sock
, cmd
, arg
);
2027 return -ENOIOCTLCMD
;
2032 #ifndef CONFIG_PACKET_MMAP
2033 #define packet_mmap sock_no_mmap
2034 #define packet_poll datagram_poll
2037 static unsigned int packet_poll(struct file
*file
, struct socket
*sock
,
2040 struct sock
*sk
= sock
->sk
;
2041 struct packet_sock
*po
= pkt_sk(sk
);
2042 unsigned int mask
= datagram_poll(file
, sock
, wait
);
2044 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
2045 if (po
->rx_ring
.pg_vec
) {
2046 if (!packet_previous_frame(po
, &po
->rx_ring
, TP_STATUS_KERNEL
))
2047 mask
|= POLLIN
| POLLRDNORM
;
2049 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
2050 spin_lock_bh(&sk
->sk_write_queue
.lock
);
2051 if (po
->tx_ring
.pg_vec
) {
2052 if (packet_current_frame(po
, &po
->tx_ring
, TP_STATUS_AVAILABLE
))
2053 mask
|= POLLOUT
| POLLWRNORM
;
2055 spin_unlock_bh(&sk
->sk_write_queue
.lock
);
2060 /* Dirty? Well, I still did not learn better way to account
2064 static void packet_mm_open(struct vm_area_struct
*vma
)
2066 struct file
*file
= vma
->vm_file
;
2067 struct socket
*sock
= file
->private_data
;
2068 struct sock
*sk
= sock
->sk
;
2071 atomic_inc(&pkt_sk(sk
)->mapped
);
2074 static void packet_mm_close(struct vm_area_struct
*vma
)
2076 struct file
*file
= vma
->vm_file
;
2077 struct socket
*sock
= file
->private_data
;
2078 struct sock
*sk
= sock
->sk
;
2081 atomic_dec(&pkt_sk(sk
)->mapped
);
2084 static const struct vm_operations_struct packet_mmap_ops
= {
2085 .open
= packet_mm_open
,
2086 .close
= packet_mm_close
,
2089 static void free_pg_vec(char **pg_vec
, unsigned int order
, unsigned int len
)
2093 for (i
= 0; i
< len
; i
++) {
2094 if (likely(pg_vec
[i
]))
2095 free_pages((unsigned long) pg_vec
[i
], order
);
2100 static inline char *alloc_one_pg_vec_page(unsigned long order
)
2102 gfp_t gfp_flags
= GFP_KERNEL
| __GFP_COMP
| __GFP_ZERO
| __GFP_NOWARN
;
2104 return (char *) __get_free_pages(gfp_flags
, order
);
2107 static char **alloc_pg_vec(struct tpacket_req
*req
, int order
)
2109 unsigned int block_nr
= req
->tp_block_nr
;
2113 pg_vec
= kzalloc(block_nr
* sizeof(char *), GFP_KERNEL
);
2114 if (unlikely(!pg_vec
))
2117 for (i
= 0; i
< block_nr
; i
++) {
2118 pg_vec
[i
] = alloc_one_pg_vec_page(order
);
2119 if (unlikely(!pg_vec
[i
]))
2120 goto out_free_pgvec
;
2127 free_pg_vec(pg_vec
, order
, block_nr
);
2132 static int packet_set_ring(struct sock
*sk
, struct tpacket_req
*req
,
2133 int closing
, int tx_ring
)
2135 char **pg_vec
= NULL
;
2136 struct packet_sock
*po
= pkt_sk(sk
);
2137 int was_running
, order
= 0;
2138 struct packet_ring_buffer
*rb
;
2139 struct sk_buff_head
*rb_queue
;
2143 rb
= tx_ring
? &po
->tx_ring
: &po
->rx_ring
;
2144 rb_queue
= tx_ring
? &sk
->sk_write_queue
: &sk
->sk_receive_queue
;
2148 if (atomic_read(&po
->mapped
))
2150 if (atomic_read(&rb
->pending
))
2154 if (req
->tp_block_nr
) {
2155 /* Sanity tests and some calculations */
2157 if (unlikely(rb
->pg_vec
))
2160 switch (po
->tp_version
) {
2162 po
->tp_hdrlen
= TPACKET_HDRLEN
;
2165 po
->tp_hdrlen
= TPACKET2_HDRLEN
;
2170 if (unlikely((int)req
->tp_block_size
<= 0))
2172 if (unlikely(req
->tp_block_size
& (PAGE_SIZE
- 1)))
2174 if (unlikely(req
->tp_frame_size
< po
->tp_hdrlen
+
2177 if (unlikely(req
->tp_frame_size
& (TPACKET_ALIGNMENT
- 1)))
2180 rb
->frames_per_block
= req
->tp_block_size
/req
->tp_frame_size
;
2181 if (unlikely(rb
->frames_per_block
<= 0))
2183 if (unlikely((rb
->frames_per_block
* req
->tp_block_nr
) !=
2188 order
= get_order(req
->tp_block_size
);
2189 pg_vec
= alloc_pg_vec(req
, order
);
2190 if (unlikely(!pg_vec
))
2196 if (unlikely(req
->tp_frame_nr
))
2202 /* Detach socket from network */
2203 spin_lock(&po
->bind_lock
);
2204 was_running
= po
->running
;
2207 __dev_remove_pack(&po
->prot_hook
);
2212 spin_unlock(&po
->bind_lock
);
2217 mutex_lock(&po
->pg_vec_lock
);
2218 if (closing
|| atomic_read(&po
->mapped
) == 0) {
2220 #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; })
2221 spin_lock_bh(&rb_queue
->lock
);
2222 pg_vec
= XC(rb
->pg_vec
, pg_vec
);
2223 rb
->frame_max
= (req
->tp_frame_nr
- 1);
2225 rb
->frame_size
= req
->tp_frame_size
;
2226 spin_unlock_bh(&rb_queue
->lock
);
2228 order
= XC(rb
->pg_vec_order
, order
);
2229 req
->tp_block_nr
= XC(rb
->pg_vec_len
, req
->tp_block_nr
);
2231 rb
->pg_vec_pages
= req
->tp_block_size
/PAGE_SIZE
;
2232 po
->prot_hook
.func
= (po
->rx_ring
.pg_vec
) ?
2233 tpacket_rcv
: packet_rcv
;
2234 skb_queue_purge(rb_queue
);
2236 if (atomic_read(&po
->mapped
))
2237 pr_err("packet_mmap: vma is busy: %d\n",
2238 atomic_read(&po
->mapped
));
2240 mutex_unlock(&po
->pg_vec_lock
);
2242 spin_lock(&po
->bind_lock
);
2243 if (was_running
&& !po
->running
) {
2247 dev_add_pack(&po
->prot_hook
);
2249 spin_unlock(&po
->bind_lock
);
2254 free_pg_vec(pg_vec
, order
, req
->tp_block_nr
);
2259 static int packet_mmap(struct file
*file
, struct socket
*sock
,
2260 struct vm_area_struct
*vma
)
2262 struct sock
*sk
= sock
->sk
;
2263 struct packet_sock
*po
= pkt_sk(sk
);
2264 unsigned long size
, expected_size
;
2265 struct packet_ring_buffer
*rb
;
2266 unsigned long start
;
2273 mutex_lock(&po
->pg_vec_lock
);
2276 for (rb
= &po
->rx_ring
; rb
<= &po
->tx_ring
; rb
++) {
2278 expected_size
+= rb
->pg_vec_len
2284 if (expected_size
== 0)
2287 size
= vma
->vm_end
- vma
->vm_start
;
2288 if (size
!= expected_size
)
2291 start
= vma
->vm_start
;
2292 for (rb
= &po
->rx_ring
; rb
<= &po
->tx_ring
; rb
++) {
2293 if (rb
->pg_vec
== NULL
)
2296 for (i
= 0; i
< rb
->pg_vec_len
; i
++) {
2297 struct page
*page
= virt_to_page(rb
->pg_vec
[i
]);
2300 for (pg_num
= 0; pg_num
< rb
->pg_vec_pages
;
2302 err
= vm_insert_page(vma
, start
, page
);
2310 atomic_inc(&po
->mapped
);
2311 vma
->vm_ops
= &packet_mmap_ops
;
2315 mutex_unlock(&po
->pg_vec_lock
);
2321 static const struct proto_ops packet_ops_spkt
= {
2322 .family
= PF_PACKET
,
2323 .owner
= THIS_MODULE
,
2324 .release
= packet_release
,
2325 .bind
= packet_bind_spkt
,
2326 .connect
= sock_no_connect
,
2327 .socketpair
= sock_no_socketpair
,
2328 .accept
= sock_no_accept
,
2329 .getname
= packet_getname_spkt
,
2330 .poll
= datagram_poll
,
2331 .ioctl
= packet_ioctl
,
2332 .listen
= sock_no_listen
,
2333 .shutdown
= sock_no_shutdown
,
2334 .setsockopt
= sock_no_setsockopt
,
2335 .getsockopt
= sock_no_getsockopt
,
2336 .sendmsg
= packet_sendmsg_spkt
,
2337 .recvmsg
= packet_recvmsg
,
2338 .mmap
= sock_no_mmap
,
2339 .sendpage
= sock_no_sendpage
,
2342 static const struct proto_ops packet_ops
= {
2343 .family
= PF_PACKET
,
2344 .owner
= THIS_MODULE
,
2345 .release
= packet_release
,
2346 .bind
= packet_bind
,
2347 .connect
= sock_no_connect
,
2348 .socketpair
= sock_no_socketpair
,
2349 .accept
= sock_no_accept
,
2350 .getname
= packet_getname
,
2351 .poll
= packet_poll
,
2352 .ioctl
= packet_ioctl
,
2353 .listen
= sock_no_listen
,
2354 .shutdown
= sock_no_shutdown
,
2355 .setsockopt
= packet_setsockopt
,
2356 .getsockopt
= packet_getsockopt
,
2357 .sendmsg
= packet_sendmsg
,
2358 .recvmsg
= packet_recvmsg
,
2359 .mmap
= packet_mmap
,
2360 .sendpage
= sock_no_sendpage
,
2363 static struct net_proto_family packet_family_ops
= {
2364 .family
= PF_PACKET
,
2365 .create
= packet_create
,
2366 .owner
= THIS_MODULE
,
2369 static struct notifier_block packet_netdev_notifier
= {
2370 .notifier_call
= packet_notifier
,
2373 #ifdef CONFIG_PROC_FS
2374 static inline struct sock
*packet_seq_idx(struct net
*net
, loff_t off
)
2377 struct hlist_node
*node
;
2379 sk_for_each(s
, node
, &net
->packet
.sklist
) {
2386 static void *packet_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2387 __acquires(seq_file_net(seq
)->packet
.sklist_lock
)
2389 struct net
*net
= seq_file_net(seq
);
2390 read_lock(&net
->packet
.sklist_lock
);
2391 return *pos
? packet_seq_idx(net
, *pos
- 1) : SEQ_START_TOKEN
;
2394 static void *packet_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2396 struct net
*net
= seq_file_net(seq
);
2398 return (v
== SEQ_START_TOKEN
)
2399 ? sk_head(&net
->packet
.sklist
)
2400 : sk_next((struct sock
*)v
) ;
2403 static void packet_seq_stop(struct seq_file
*seq
, void *v
)
2404 __releases(seq_file_net(seq
)->packet
.sklist_lock
)
2406 struct net
*net
= seq_file_net(seq
);
2407 read_unlock(&net
->packet
.sklist_lock
);
2410 static int packet_seq_show(struct seq_file
*seq
, void *v
)
2412 if (v
== SEQ_START_TOKEN
)
2413 seq_puts(seq
, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
2416 const struct packet_sock
*po
= pkt_sk(s
);
2419 "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
2421 atomic_read(&s
->sk_refcnt
),
2426 atomic_read(&s
->sk_rmem_alloc
),
2434 static const struct seq_operations packet_seq_ops
= {
2435 .start
= packet_seq_start
,
2436 .next
= packet_seq_next
,
2437 .stop
= packet_seq_stop
,
2438 .show
= packet_seq_show
,
2441 static int packet_seq_open(struct inode
*inode
, struct file
*file
)
2443 return seq_open_net(inode
, file
, &packet_seq_ops
,
2444 sizeof(struct seq_net_private
));
2447 static const struct file_operations packet_seq_fops
= {
2448 .owner
= THIS_MODULE
,
2449 .open
= packet_seq_open
,
2451 .llseek
= seq_lseek
,
2452 .release
= seq_release_net
,
2457 static int packet_net_init(struct net
*net
)
2459 rwlock_init(&net
->packet
.sklist_lock
);
2460 INIT_HLIST_HEAD(&net
->packet
.sklist
);
2462 if (!proc_net_fops_create(net
, "packet", 0, &packet_seq_fops
))
2468 static void packet_net_exit(struct net
*net
)
2470 proc_net_remove(net
, "packet");
2473 static struct pernet_operations packet_net_ops
= {
2474 .init
= packet_net_init
,
2475 .exit
= packet_net_exit
,
2479 static void __exit
packet_exit(void)
2481 unregister_netdevice_notifier(&packet_netdev_notifier
);
2482 unregister_pernet_subsys(&packet_net_ops
);
2483 sock_unregister(PF_PACKET
);
2484 proto_unregister(&packet_proto
);
2487 static int __init
packet_init(void)
2489 int rc
= proto_register(&packet_proto
, 0);
2494 sock_register(&packet_family_ops
);
2495 register_pernet_subsys(&packet_net_ops
);
2496 register_netdevice_notifier(&packet_netdev_notifier
);
2501 module_init(packet_init
);
2502 module_exit(packet_exit
);
2503 MODULE_LICENSE("GPL");
2504 MODULE_ALIAS_NETPROTO(PF_PACKET
);