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 * The User Datagram Protocol (UDP).
8 * Version: $Id: udp.c,v 1.102 2002/02/01 22:01:04 davem Exp $
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Arnt Gulbrandsen, <agulbra@nvg.unit.no>
13 * Alan Cox, <Alan.Cox@linux.org>
14 * Hirokazu Takahashi, <taka@valinux.co.jp>
17 * Alan Cox : verify_area() calls
18 * Alan Cox : stopped close while in use off icmp
19 * messages. Not a fix but a botch that
20 * for udp at least is 'valid'.
21 * Alan Cox : Fixed icmp handling properly
22 * Alan Cox : Correct error for oversized datagrams
23 * Alan Cox : Tidied select() semantics.
24 * Alan Cox : udp_err() fixed properly, also now
25 * select and read wake correctly on errors
26 * Alan Cox : udp_send verify_area moved to avoid mem leak
27 * Alan Cox : UDP can count its memory
28 * Alan Cox : send to an unknown connection causes
29 * an ECONNREFUSED off the icmp, but
31 * Alan Cox : Switched to new sk_buff handlers. No more backlog!
32 * Alan Cox : Using generic datagram code. Even smaller and the PEEK
33 * bug no longer crashes it.
34 * Fred Van Kempen : Net2e support for sk->broadcast.
35 * Alan Cox : Uses skb_free_datagram
36 * Alan Cox : Added get/set sockopt support.
37 * Alan Cox : Broadcasting without option set returns EACCES.
38 * Alan Cox : No wakeup calls. Instead we now use the callbacks.
39 * Alan Cox : Use ip_tos and ip_ttl
40 * Alan Cox : SNMP Mibs
41 * Alan Cox : MSG_DONTROUTE, and 0.0.0.0 support.
42 * Matt Dillon : UDP length checks.
43 * Alan Cox : Smarter af_inet used properly.
44 * Alan Cox : Use new kernel side addressing.
45 * Alan Cox : Incorrect return on truncated datagram receive.
46 * Arnt Gulbrandsen : New udp_send and stuff
47 * Alan Cox : Cache last socket
48 * Alan Cox : Route cache
49 * Jon Peatfield : Minor efficiency fix to sendto().
50 * Mike Shaver : RFC1122 checks.
51 * Alan Cox : Nonblocking error fix.
52 * Willy Konynenberg : Transparent proxying support.
53 * Mike McLagan : Routing by source
54 * David S. Miller : New socket lookup architecture.
55 * Last socket cache retained as it
56 * does have a high hit rate.
57 * Olaf Kirch : Don't linearise iovec on sendmsg.
58 * Andi Kleen : Some cleanups, cache destination entry
60 * Vitaly E. Lavrov : Transparent proxy revived after year coma.
61 * Melvin Smith : Check msg_name not msg_namelen in sendto(),
62 * return ENOTCONN for unconnected sockets (POSIX)
63 * Janos Farkas : don't deliver multi/broadcasts to a different
64 * bound-to-device socket
65 * Hirokazu Takahashi : HW checksumming for outgoing UDP
67 * Hirokazu Takahashi : sendfile() on UDP works now.
68 * Arnaldo C. Melo : convert /proc/net/udp to seq_file
69 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
70 * Alexey Kuznetsov: allow both IPv4 and IPv6 sockets to bind
71 * a single port at the same time.
72 * Derek Atkins <derek@ihtfp.com>: Add Encapulation Support
75 * This program is free software; you can redistribute it and/or
76 * modify it under the terms of the GNU General Public License
77 * as published by the Free Software Foundation; either version
78 * 2 of the License, or (at your option) any later version.
81 #include <asm/system.h>
82 #include <asm/uaccess.h>
83 #include <asm/ioctls.h>
84 #include <linux/types.h>
85 #include <linux/fcntl.h>
86 #include <linux/module.h>
87 #include <linux/socket.h>
88 #include <linux/sockios.h>
89 #include <linux/igmp.h>
91 #include <linux/errno.h>
92 #include <linux/timer.h>
94 #include <linux/inet.h>
95 #include <linux/netdevice.h>
96 #include <net/tcp_states.h>
97 #include <linux/skbuff.h>
98 #include <linux/proc_fs.h>
99 #include <linux/seq_file.h>
100 #include <net/icmp.h>
101 #include <net/route.h>
102 #include <net/checksum.h>
103 #include <net/xfrm.h>
104 #include "udp_impl.h"
107 * Snmp MIB for the UDP layer
110 DEFINE_SNMP_STAT(struct udp_mib
, udp_statistics
) __read_mostly
;
112 struct hlist_head udp_hash
[UDP_HTABLE_SIZE
];
113 DEFINE_RWLOCK(udp_hash_lock
);
115 static int udp_port_rover
;
117 static inline int __udp_lib_lport_inuse(__u16 num
, struct hlist_head udptable
[])
120 struct hlist_node
*node
;
122 sk_for_each(sk
, node
, &udptable
[num
& (UDP_HTABLE_SIZE
- 1)])
123 if (sk
->sk_hash
== num
)
129 * __udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6
131 * @sk: socket struct in question
132 * @snum: port number to look up
133 * @udptable: hash list table, must be of UDP_HTABLE_SIZE
134 * @port_rover: pointer to record of last unallocated port
135 * @saddr_comp: AF-dependent comparison of bound local IP addresses
137 int __udp_lib_get_port(struct sock
*sk
, unsigned short snum
,
138 struct hlist_head udptable
[], int *port_rover
,
139 int (*saddr_comp
)(const struct sock
*sk1
,
140 const struct sock
*sk2
) )
142 struct hlist_node
*node
;
143 struct hlist_head
*head
;
147 write_lock_bh(&udp_hash_lock
);
149 int best_size_so_far
, best
, result
, i
;
151 if (*port_rover
> sysctl_local_port_range
[1] ||
152 *port_rover
< sysctl_local_port_range
[0])
153 *port_rover
= sysctl_local_port_range
[0];
154 best_size_so_far
= 32767;
155 best
= result
= *port_rover
;
156 for (i
= 0; i
< UDP_HTABLE_SIZE
; i
++, result
++) {
159 head
= &udptable
[result
& (UDP_HTABLE_SIZE
- 1)];
160 if (hlist_empty(head
)) {
161 if (result
> sysctl_local_port_range
[1])
162 result
= sysctl_local_port_range
[0] +
163 ((result
- sysctl_local_port_range
[0]) &
164 (UDP_HTABLE_SIZE
- 1));
168 sk_for_each(sk2
, node
, head
) {
169 if (++size
>= best_size_so_far
)
172 best_size_so_far
= size
;
178 for (i
= 0; i
< (1 << 16) / UDP_HTABLE_SIZE
;
179 i
++, result
+= UDP_HTABLE_SIZE
) {
180 if (result
> sysctl_local_port_range
[1])
181 result
= sysctl_local_port_range
[0]
182 + ((result
- sysctl_local_port_range
[0]) &
183 (UDP_HTABLE_SIZE
- 1));
184 if (! __udp_lib_lport_inuse(result
, udptable
))
187 if (i
>= (1 << 16) / UDP_HTABLE_SIZE
)
190 *port_rover
= snum
= result
;
192 head
= &udptable
[snum
& (UDP_HTABLE_SIZE
- 1)];
194 sk_for_each(sk2
, node
, head
)
195 if (sk2
->sk_hash
== snum
&&
197 (!sk2
->sk_reuse
|| !sk
->sk_reuse
) &&
198 (!sk2
->sk_bound_dev_if
|| !sk
->sk_bound_dev_if
199 || sk2
->sk_bound_dev_if
== sk
->sk_bound_dev_if
) &&
200 (*saddr_comp
)(sk
, sk2
) )
203 inet_sk(sk
)->num
= snum
;
205 if (sk_unhashed(sk
)) {
206 head
= &udptable
[snum
& (UDP_HTABLE_SIZE
- 1)];
207 sk_add_node(sk
, head
);
208 sock_prot_inc_use(sk
->sk_prot
);
212 write_unlock_bh(&udp_hash_lock
);
216 int udp_get_port(struct sock
*sk
, unsigned short snum
,
217 int (*scmp
)(const struct sock
*, const struct sock
*))
219 return __udp_lib_get_port(sk
, snum
, udp_hash
, &udp_port_rover
, scmp
);
222 int ipv4_rcv_saddr_equal(const struct sock
*sk1
, const struct sock
*sk2
)
224 struct inet_sock
*inet1
= inet_sk(sk1
), *inet2
= inet_sk(sk2
);
226 return ( !ipv6_only_sock(sk2
) &&
227 (!inet1
->rcv_saddr
|| !inet2
->rcv_saddr
||
228 inet1
->rcv_saddr
== inet2
->rcv_saddr
));
231 static inline int udp_v4_get_port(struct sock
*sk
, unsigned short snum
)
233 return udp_get_port(sk
, snum
, ipv4_rcv_saddr_equal
);
236 /* UDP is nearly always wildcards out the wazoo, it makes no sense to try
237 * harder than this. -DaveM
239 static struct sock
*__udp4_lib_lookup(__be32 saddr
, __be16 sport
,
240 __be32 daddr
, __be16 dport
,
241 int dif
, struct hlist_head udptable
[])
243 struct sock
*sk
, *result
= NULL
;
244 struct hlist_node
*node
;
245 unsigned short hnum
= ntohs(dport
);
248 read_lock(&udp_hash_lock
);
249 sk_for_each(sk
, node
, &udptable
[hnum
& (UDP_HTABLE_SIZE
- 1)]) {
250 struct inet_sock
*inet
= inet_sk(sk
);
252 if (sk
->sk_hash
== hnum
&& !ipv6_only_sock(sk
)) {
253 int score
= (sk
->sk_family
== PF_INET
? 1 : 0);
254 if (inet
->rcv_saddr
) {
255 if (inet
->rcv_saddr
!= daddr
)
260 if (inet
->daddr
!= saddr
)
265 if (inet
->dport
!= sport
)
269 if (sk
->sk_bound_dev_if
) {
270 if (sk
->sk_bound_dev_if
!= dif
)
277 } else if (score
> badness
) {
285 read_unlock(&udp_hash_lock
);
289 static inline struct sock
*udp_v4_mcast_next(struct sock
*sk
,
290 __be16 loc_port
, __be32 loc_addr
,
291 __be16 rmt_port
, __be32 rmt_addr
,
294 struct hlist_node
*node
;
296 unsigned short hnum
= ntohs(loc_port
);
298 sk_for_each_from(s
, node
) {
299 struct inet_sock
*inet
= inet_sk(s
);
301 if (s
->sk_hash
!= hnum
||
302 (inet
->daddr
&& inet
->daddr
!= rmt_addr
) ||
303 (inet
->dport
!= rmt_port
&& inet
->dport
) ||
304 (inet
->rcv_saddr
&& inet
->rcv_saddr
!= loc_addr
) ||
306 (s
->sk_bound_dev_if
&& s
->sk_bound_dev_if
!= dif
))
308 if (!ip_mc_sf_allow(s
, loc_addr
, rmt_addr
, dif
))
318 * This routine is called by the ICMP module when it gets some
319 * sort of error condition. If err < 0 then the socket should
320 * be closed and the error returned to the user. If err > 0
321 * it's just the icmp type << 8 | icmp code.
322 * Header points to the ip header of the error packet. We move
323 * on past this. Then (as it used to claim before adjustment)
324 * header points to the first 8 bytes of the udp header. We need
325 * to find the appropriate port.
328 void __udp4_lib_err(struct sk_buff
*skb
, u32 info
, struct hlist_head udptable
[])
330 struct inet_sock
*inet
;
331 struct iphdr
*iph
= (struct iphdr
*)skb
->data
;
332 struct udphdr
*uh
= (struct udphdr
*)(skb
->data
+(iph
->ihl
<<2));
333 const int type
= icmp_hdr(skb
)->type
;
334 const int code
= icmp_hdr(skb
)->code
;
339 sk
= __udp4_lib_lookup(iph
->daddr
, uh
->dest
, iph
->saddr
, uh
->source
,
340 skb
->dev
->ifindex
, udptable
);
342 ICMP_INC_STATS_BH(ICMP_MIB_INERRORS
);
343 return; /* No socket for error */
352 case ICMP_TIME_EXCEEDED
:
355 case ICMP_SOURCE_QUENCH
:
357 case ICMP_PARAMETERPROB
:
361 case ICMP_DEST_UNREACH
:
362 if (code
== ICMP_FRAG_NEEDED
) { /* Path MTU discovery */
363 if (inet
->pmtudisc
!= IP_PMTUDISC_DONT
) {
371 if (code
<= NR_ICMP_UNREACH
) {
372 harderr
= icmp_err_convert
[code
].fatal
;
373 err
= icmp_err_convert
[code
].errno
;
379 * RFC1122: OK. Passes ICMP errors back to application, as per
382 if (!inet
->recverr
) {
383 if (!harderr
|| sk
->sk_state
!= TCP_ESTABLISHED
)
386 ip_icmp_error(sk
, skb
, err
, uh
->dest
, info
, (u8
*)(uh
+1));
389 sk
->sk_error_report(sk
);
394 void udp_err(struct sk_buff
*skb
, u32 info
)
396 return __udp4_lib_err(skb
, info
, udp_hash
);
400 * Throw away all pending data and cancel the corking. Socket is locked.
402 static void udp_flush_pending_frames(struct sock
*sk
)
404 struct udp_sock
*up
= udp_sk(sk
);
409 ip_flush_pending_frames(sk
);
414 * udp4_hwcsum_outgoing - handle outgoing HW checksumming
415 * @sk: socket we are sending on
416 * @skb: sk_buff containing the filled-in UDP header
417 * (checksum field must be zeroed out)
419 static void udp4_hwcsum_outgoing(struct sock
*sk
, struct sk_buff
*skb
,
420 __be32 src
, __be32 dst
, int len
)
423 struct udphdr
*uh
= udp_hdr(skb
);
426 if (skb_queue_len(&sk
->sk_write_queue
) == 1) {
428 * Only one fragment on the socket.
430 skb
->csum_start
= skb_transport_header(skb
) - skb
->head
;
431 skb
->csum_offset
= offsetof(struct udphdr
, check
);
432 uh
->check
= ~csum_tcpudp_magic(src
, dst
, len
, IPPROTO_UDP
, 0);
435 * HW-checksum won't work as there are two or more
436 * fragments on the socket so that all csums of sk_buffs
439 offset
= skb_transport_offset(skb
);
440 skb
->csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
442 skb
->ip_summed
= CHECKSUM_NONE
;
444 skb_queue_walk(&sk
->sk_write_queue
, skb
) {
445 csum
= csum_add(csum
, skb
->csum
);
448 uh
->check
= csum_tcpudp_magic(src
, dst
, len
, IPPROTO_UDP
, csum
);
450 uh
->check
= CSUM_MANGLED_0
;
455 * Push out all pending data as one UDP datagram. Socket is locked.
457 static int udp_push_pending_frames(struct sock
*sk
)
459 struct udp_sock
*up
= udp_sk(sk
);
460 struct inet_sock
*inet
= inet_sk(sk
);
461 struct flowi
*fl
= &inet
->cork
.fl
;
467 /* Grab the skbuff where UDP header space exists. */
468 if ((skb
= skb_peek(&sk
->sk_write_queue
)) == NULL
)
472 * Create a UDP header
475 uh
->source
= fl
->fl_ip_sport
;
476 uh
->dest
= fl
->fl_ip_dport
;
477 uh
->len
= htons(up
->len
);
480 if (up
->pcflag
) /* UDP-Lite */
481 csum
= udplite_csum_outgoing(sk
, skb
);
483 else if (sk
->sk_no_check
== UDP_CSUM_NOXMIT
) { /* UDP csum disabled */
485 skb
->ip_summed
= CHECKSUM_NONE
;
488 } else if (skb
->ip_summed
== CHECKSUM_PARTIAL
) { /* UDP hardware csum */
490 udp4_hwcsum_outgoing(sk
, skb
, fl
->fl4_src
,fl
->fl4_dst
, up
->len
);
493 } else /* `normal' UDP */
494 csum
= udp_csum_outgoing(sk
, skb
);
496 /* add protocol-dependent pseudo-header */
497 uh
->check
= csum_tcpudp_magic(fl
->fl4_src
, fl
->fl4_dst
, up
->len
,
498 sk
->sk_protocol
, csum
);
500 uh
->check
= CSUM_MANGLED_0
;
503 err
= ip_push_pending_frames(sk
);
510 int udp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
, struct msghdr
*msg
,
513 struct inet_sock
*inet
= inet_sk(sk
);
514 struct udp_sock
*up
= udp_sk(sk
);
516 struct ipcm_cookie ipc
;
517 struct rtable
*rt
= NULL
;
520 __be32 daddr
, faddr
, saddr
;
523 int err
, is_udplite
= up
->pcflag
;
524 int corkreq
= up
->corkflag
|| msg
->msg_flags
&MSG_MORE
;
525 int (*getfrag
)(void *, char *, int, int, int, struct sk_buff
*);
534 if (msg
->msg_flags
&MSG_OOB
) /* Mirror BSD error message compatibility */
541 * There are pending frames.
542 * The socket lock must be held while it's corked.
545 if (likely(up
->pending
)) {
546 if (unlikely(up
->pending
!= AF_INET
)) {
554 ulen
+= sizeof(struct udphdr
);
557 * Get and verify the address.
560 struct sockaddr_in
* usin
= (struct sockaddr_in
*)msg
->msg_name
;
561 if (msg
->msg_namelen
< sizeof(*usin
))
563 if (usin
->sin_family
!= AF_INET
) {
564 if (usin
->sin_family
!= AF_UNSPEC
)
565 return -EAFNOSUPPORT
;
568 daddr
= usin
->sin_addr
.s_addr
;
569 dport
= usin
->sin_port
;
573 if (sk
->sk_state
!= TCP_ESTABLISHED
)
574 return -EDESTADDRREQ
;
577 /* Open fast path for connected socket.
578 Route will not be used, if at least one option is set.
582 ipc
.addr
= inet
->saddr
;
584 ipc
.oif
= sk
->sk_bound_dev_if
;
585 if (msg
->msg_controllen
) {
586 err
= ip_cmsg_send(msg
, &ipc
);
597 ipc
.addr
= faddr
= daddr
;
599 if (ipc
.opt
&& ipc
.opt
->srr
) {
602 faddr
= ipc
.opt
->faddr
;
605 tos
= RT_TOS(inet
->tos
);
606 if (sock_flag(sk
, SOCK_LOCALROUTE
) ||
607 (msg
->msg_flags
& MSG_DONTROUTE
) ||
608 (ipc
.opt
&& ipc
.opt
->is_strictroute
)) {
613 if (MULTICAST(daddr
)) {
615 ipc
.oif
= inet
->mc_index
;
617 saddr
= inet
->mc_addr
;
622 rt
= (struct rtable
*)sk_dst_check(sk
, 0);
625 struct flowi fl
= { .oif
= ipc
.oif
,
630 .proto
= sk
->sk_protocol
,
632 { .sport
= inet
->sport
,
633 .dport
= dport
} } };
634 security_sk_classify_flow(sk
, &fl
);
635 err
= ip_route_output_flow(&rt
, &fl
, sk
, 1);
640 if ((rt
->rt_flags
& RTCF_BROADCAST
) &&
641 !sock_flag(sk
, SOCK_BROADCAST
))
644 sk_dst_set(sk
, dst_clone(&rt
->u
.dst
));
647 if (msg
->msg_flags
&MSG_CONFIRM
)
653 daddr
= ipc
.addr
= rt
->rt_dst
;
656 if (unlikely(up
->pending
)) {
657 /* The socket is already corked while preparing it. */
658 /* ... which is an evident application bug. --ANK */
661 LIMIT_NETDEBUG(KERN_DEBUG
"udp cork app bug 2\n");
666 * Now cork the socket to pend data.
668 inet
->cork
.fl
.fl4_dst
= daddr
;
669 inet
->cork
.fl
.fl_ip_dport
= dport
;
670 inet
->cork
.fl
.fl4_src
= saddr
;
671 inet
->cork
.fl
.fl_ip_sport
= inet
->sport
;
672 up
->pending
= AF_INET
;
676 getfrag
= is_udplite
? udplite_getfrag
: ip_generic_getfrag
;
677 err
= ip_append_data(sk
, getfrag
, msg
->msg_iov
, ulen
,
678 sizeof(struct udphdr
), &ipc
, rt
,
679 corkreq
? msg
->msg_flags
|MSG_MORE
: msg
->msg_flags
);
681 udp_flush_pending_frames(sk
);
683 err
= udp_push_pending_frames(sk
);
684 else if (unlikely(skb_queue_empty(&sk
->sk_write_queue
)))
693 UDP_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS
, is_udplite
);
697 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
698 * ENOBUFS might not be good (it's not tunable per se), but otherwise
699 * we don't have a good statistic (IpOutDiscards but it can be too many
700 * things). We could add another new stat but at least for now that
701 * seems like overkill.
703 if (err
== -ENOBUFS
|| test_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
)) {
704 UDP_INC_STATS_USER(UDP_MIB_SNDBUFERRORS
, is_udplite
);
709 dst_confirm(&rt
->u
.dst
);
710 if (!(msg
->msg_flags
&MSG_PROBE
) || len
)
711 goto back_from_confirm
;
716 int udp_sendpage(struct sock
*sk
, struct page
*page
, int offset
,
717 size_t size
, int flags
)
719 struct udp_sock
*up
= udp_sk(sk
);
723 struct msghdr msg
= { .msg_flags
= flags
|MSG_MORE
};
725 /* Call udp_sendmsg to specify destination address which
726 * sendpage interface can't pass.
727 * This will succeed only when the socket is connected.
729 ret
= udp_sendmsg(NULL
, sk
, &msg
, 0);
736 if (unlikely(!up
->pending
)) {
739 LIMIT_NETDEBUG(KERN_DEBUG
"udp cork app bug 3\n");
743 ret
= ip_append_page(sk
, page
, offset
, size
, flags
);
744 if (ret
== -EOPNOTSUPP
) {
746 return sock_no_sendpage(sk
->sk_socket
, page
, offset
,
750 udp_flush_pending_frames(sk
);
755 if (!(up
->corkflag
|| (flags
&MSG_MORE
)))
756 ret
= udp_push_pending_frames(sk
);
765 * IOCTL requests applicable to the UDP protocol
768 int udp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
773 int amount
= atomic_read(&sk
->sk_wmem_alloc
);
774 return put_user(amount
, (int __user
*)arg
);
780 unsigned long amount
;
783 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
784 skb
= skb_peek(&sk
->sk_receive_queue
);
787 * We will only return the amount
788 * of this packet since that is all
791 amount
= skb
->len
- sizeof(struct udphdr
);
793 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
794 return put_user(amount
, (int __user
*)arg
);
805 * This should be easy, if there is something there we
806 * return it, otherwise we block.
809 int udp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
, struct msghdr
*msg
,
810 size_t len
, int noblock
, int flags
, int *addr_len
)
812 struct inet_sock
*inet
= inet_sk(sk
);
813 struct sockaddr_in
*sin
= (struct sockaddr_in
*)msg
->msg_name
;
815 unsigned int ulen
, copied
;
817 int is_udplite
= IS_UDPLITE(sk
);
820 * Check any passed addresses
823 *addr_len
=sizeof(*sin
);
825 if (flags
& MSG_ERRQUEUE
)
826 return ip_recv_error(sk
, msg
, len
);
829 skb
= skb_recv_datagram(sk
, flags
, noblock
, &err
);
833 ulen
= skb
->len
- sizeof(struct udphdr
);
837 else if (copied
< ulen
)
838 msg
->msg_flags
|= MSG_TRUNC
;
841 * If checksum is needed at all, try to do it while copying the
842 * data. If the data is truncated, or if we only want a partial
843 * coverage checksum (UDP-Lite), do it before the copy.
846 if (copied
< ulen
|| UDP_SKB_CB(skb
)->partial_cov
) {
847 if (udp_lib_checksum_complete(skb
))
851 if (skb_csum_unnecessary(skb
))
852 err
= skb_copy_datagram_iovec(skb
, sizeof(struct udphdr
),
853 msg
->msg_iov
, copied
);
855 err
= skb_copy_and_csum_datagram_iovec(skb
, sizeof(struct udphdr
), msg
->msg_iov
);
864 sock_recv_timestamp(msg
, sk
, skb
);
866 /* Copy the address. */
869 sin
->sin_family
= AF_INET
;
870 sin
->sin_port
= udp_hdr(skb
)->source
;
871 sin
->sin_addr
.s_addr
= ip_hdr(skb
)->saddr
;
872 memset(sin
->sin_zero
, 0, sizeof(sin
->sin_zero
));
874 if (inet
->cmsg_flags
)
875 ip_cmsg_recv(msg
, skb
);
878 if (flags
& MSG_TRUNC
)
882 skb_free_datagram(sk
, skb
);
887 UDP_INC_STATS_BH(UDP_MIB_INERRORS
, is_udplite
);
889 skb_kill_datagram(sk
, skb
, flags
);
897 int udp_disconnect(struct sock
*sk
, int flags
)
899 struct inet_sock
*inet
= inet_sk(sk
);
901 * 1003.1g - break association.
904 sk
->sk_state
= TCP_CLOSE
;
907 sk
->sk_bound_dev_if
= 0;
908 if (!(sk
->sk_userlocks
& SOCK_BINDADDR_LOCK
))
909 inet_reset_saddr(sk
);
911 if (!(sk
->sk_userlocks
& SOCK_BINDPORT_LOCK
)) {
912 sk
->sk_prot
->unhash(sk
);
920 * 1 if the the UDP system should process it
921 * 0 if we should drop this packet
922 * -1 if it should get processed by xfrm4_rcv_encap
924 static int udp_encap_rcv(struct sock
* sk
, struct sk_buff
*skb
)
929 struct udp_sock
*up
= udp_sk(sk
);
936 __u16 encap_type
= up
->encap_type
;
938 /* if we're overly short, let UDP handle it */
939 len
= skb
->len
- sizeof(struct udphdr
);
943 /* if this is not encapsulated socket, then just return now */
947 /* If this is a paged skb, make sure we pull up
948 * whatever data we need to look at. */
949 if (!pskb_may_pull(skb
, sizeof(struct udphdr
) + min(len
, 8)))
952 /* Now we can get the pointers */
954 udpdata
= (__u8
*)uh
+ sizeof(struct udphdr
);
955 udpdata32
= (__be32
*)udpdata
;
957 switch (encap_type
) {
959 case UDP_ENCAP_ESPINUDP
:
960 /* Check if this is a keepalive packet. If so, eat it. */
961 if (len
== 1 && udpdata
[0] == 0xff) {
963 } else if (len
> sizeof(struct ip_esp_hdr
) && udpdata32
[0] != 0) {
964 /* ESP Packet without Non-ESP header */
965 len
= sizeof(struct udphdr
);
967 /* Must be an IKE packet.. pass it through */
970 case UDP_ENCAP_ESPINUDP_NON_IKE
:
971 /* Check if this is a keepalive packet. If so, eat it. */
972 if (len
== 1 && udpdata
[0] == 0xff) {
974 } else if (len
> 2 * sizeof(u32
) + sizeof(struct ip_esp_hdr
) &&
975 udpdata32
[0] == 0 && udpdata32
[1] == 0) {
977 /* ESP Packet with Non-IKE marker */
978 len
= sizeof(struct udphdr
) + 2 * sizeof(u32
);
980 /* Must be an IKE packet.. pass it through */
985 /* At this point we are sure that this is an ESPinUDP packet,
986 * so we need to remove 'len' bytes from the packet (the UDP
987 * header and optional ESP marker bytes) and then modify the
988 * protocol to ESP, and then call into the transform receiver.
990 if (skb_cloned(skb
) && pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
))
993 /* Now we can update and verify the packet length... */
995 iphlen
= iph
->ihl
<< 2;
996 iph
->tot_len
= htons(ntohs(iph
->tot_len
) - len
);
997 if (skb
->len
< iphlen
+ len
) {
998 /* packet is too small!?! */
1002 /* pull the data buffer up to the ESP header and set the
1003 * transport header to point to ESP. Keep UDP on the stack
1006 __skb_pull(skb
, len
);
1007 skb_reset_transport_header(skb
);
1009 /* modify the protocol (it's ESP!) */
1010 iph
->protocol
= IPPROTO_ESP
;
1012 /* and let the caller know to send this into the ESP processor... */
1020 * >0: "udp encap" protocol resubmission
1022 * Note that in the success and error cases, the skb is assumed to
1023 * have either been requeued or freed.
1025 int udp_queue_rcv_skb(struct sock
* sk
, struct sk_buff
*skb
)
1027 struct udp_sock
*up
= udp_sk(sk
);
1031 * Charge it to the socket, dropping if the queue is full.
1033 if (!xfrm4_policy_check(sk
, XFRM_POLICY_IN
, skb
))
1037 if (up
->encap_type
) {
1039 * This is an encapsulation socket, so let's see if this is
1040 * an encapsulated packet.
1041 * If it's a keepalive packet, then just eat it.
1042 * If it's an encapsulateed packet, then pass it to the
1043 * IPsec xfrm input and return the response
1044 * appropriately. Otherwise, just fall through and
1045 * pass this up the UDP socket.
1049 ret
= udp_encap_rcv(sk
, skb
);
1051 /* Eat the packet .. */
1056 /* process the ESP packet */
1057 ret
= xfrm4_rcv_encap(skb
, up
->encap_type
);
1058 UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS
, up
->pcflag
);
1061 /* FALLTHROUGH -- it's a UDP Packet */
1065 * UDP-Lite specific tests, ignored on UDP sockets
1067 if ((up
->pcflag
& UDPLITE_RECV_CC
) && UDP_SKB_CB(skb
)->partial_cov
) {
1070 * MIB statistics other than incrementing the error count are
1071 * disabled for the following two types of errors: these depend
1072 * on the application settings, not on the functioning of the
1073 * protocol stack as such.
1075 * RFC 3828 here recommends (sec 3.3): "There should also be a
1076 * way ... to ... at least let the receiving application block
1077 * delivery of packets with coverage values less than a value
1078 * provided by the application."
1080 if (up
->pcrlen
== 0) { /* full coverage was set */
1081 LIMIT_NETDEBUG(KERN_WARNING
"UDPLITE: partial coverage "
1082 "%d while full coverage %d requested\n",
1083 UDP_SKB_CB(skb
)->cscov
, skb
->len
);
1086 /* The next case involves violating the min. coverage requested
1087 * by the receiver. This is subtle: if receiver wants x and x is
1088 * greater than the buffersize/MTU then receiver will complain
1089 * that it wants x while sender emits packets of smaller size y.
1090 * Therefore the above ...()->partial_cov statement is essential.
1092 if (UDP_SKB_CB(skb
)->cscov
< up
->pcrlen
) {
1093 LIMIT_NETDEBUG(KERN_WARNING
1094 "UDPLITE: coverage %d too small, need min %d\n",
1095 UDP_SKB_CB(skb
)->cscov
, up
->pcrlen
);
1100 if (sk
->sk_filter
) {
1101 if (udp_lib_checksum_complete(skb
))
1105 if ((rc
= sock_queue_rcv_skb(sk
,skb
)) < 0) {
1106 /* Note that an ENOMEM error is charged twice */
1108 UDP_INC_STATS_BH(UDP_MIB_RCVBUFERRORS
, up
->pcflag
);
1112 UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS
, up
->pcflag
);
1116 UDP_INC_STATS_BH(UDP_MIB_INERRORS
, up
->pcflag
);
1122 * Multicasts and broadcasts go to each listener.
1124 * Note: called only from the BH handler context,
1125 * so we don't need to lock the hashes.
1127 static int __udp4_lib_mcast_deliver(struct sk_buff
*skb
,
1129 __be32 saddr
, __be32 daddr
,
1130 struct hlist_head udptable
[])
1135 read_lock(&udp_hash_lock
);
1136 sk
= sk_head(&udptable
[ntohs(uh
->dest
) & (UDP_HTABLE_SIZE
- 1)]);
1137 dif
= skb
->dev
->ifindex
;
1138 sk
= udp_v4_mcast_next(sk
, uh
->dest
, daddr
, uh
->source
, saddr
, dif
);
1140 struct sock
*sknext
= NULL
;
1143 struct sk_buff
*skb1
= skb
;
1145 sknext
= udp_v4_mcast_next(sk_next(sk
), uh
->dest
, daddr
,
1146 uh
->source
, saddr
, dif
);
1148 skb1
= skb_clone(skb
, GFP_ATOMIC
);
1151 int ret
= udp_queue_rcv_skb(sk
, skb1
);
1153 /* we should probably re-process instead
1154 * of dropping packets here. */
1161 read_unlock(&udp_hash_lock
);
1165 /* Initialize UDP checksum. If exited with zero value (success),
1166 * CHECKSUM_UNNECESSARY means, that no more checks are required.
1167 * Otherwise, csum completion requires chacksumming packet body,
1168 * including udp header and folding it to skb->csum.
1170 static inline int udp4_csum_init(struct sk_buff
*skb
, struct udphdr
*uh
,
1173 const struct iphdr
*iph
;
1176 UDP_SKB_CB(skb
)->partial_cov
= 0;
1177 UDP_SKB_CB(skb
)->cscov
= skb
->len
;
1179 if (proto
== IPPROTO_UDPLITE
) {
1180 err
= udplite_checksum_init(skb
, uh
);
1186 if (uh
->check
== 0) {
1187 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
1188 } else if (skb
->ip_summed
== CHECKSUM_COMPLETE
) {
1189 if (!csum_tcpudp_magic(iph
->saddr
, iph
->daddr
, skb
->len
,
1191 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
1193 if (!skb_csum_unnecessary(skb
))
1194 skb
->csum
= csum_tcpudp_nofold(iph
->saddr
, iph
->daddr
,
1195 skb
->len
, proto
, 0);
1196 /* Probably, we should checksum udp header (it should be in cache
1197 * in any case) and data in tiny packets (< rx copybreak).
1204 * All we need to do is get the socket, and then do a checksum.
1207 int __udp4_lib_rcv(struct sk_buff
*skb
, struct hlist_head udptable
[],
1211 struct udphdr
*uh
= udp_hdr(skb
);
1212 unsigned short ulen
;
1213 struct rtable
*rt
= (struct rtable
*)skb
->dst
;
1214 __be32 saddr
= ip_hdr(skb
)->saddr
;
1215 __be32 daddr
= ip_hdr(skb
)->daddr
;
1218 * Validate the packet.
1220 if (!pskb_may_pull(skb
, sizeof(struct udphdr
)))
1221 goto drop
; /* No space for header. */
1223 ulen
= ntohs(uh
->len
);
1224 if (ulen
> skb
->len
)
1227 if (proto
== IPPROTO_UDP
) {
1228 /* UDP validates ulen. */
1229 if (ulen
< sizeof(*uh
) || pskb_trim_rcsum(skb
, ulen
))
1234 if (udp4_csum_init(skb
, uh
, proto
))
1237 if (rt
->rt_flags
& (RTCF_BROADCAST
|RTCF_MULTICAST
))
1238 return __udp4_lib_mcast_deliver(skb
, uh
, saddr
, daddr
, udptable
);
1240 sk
= __udp4_lib_lookup(saddr
, uh
->source
, daddr
, uh
->dest
,
1241 skb
->dev
->ifindex
, udptable
);
1244 int ret
= udp_queue_rcv_skb(sk
, skb
);
1247 /* a return value > 0 means to resubmit the input, but
1248 * it wants the return to be -protocol, or 0
1255 if (!xfrm4_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
1259 /* No socket. Drop packet silently, if checksum is wrong */
1260 if (udp_lib_checksum_complete(skb
))
1263 UDP_INC_STATS_BH(UDP_MIB_NOPORTS
, proto
== IPPROTO_UDPLITE
);
1264 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_PORT_UNREACH
, 0);
1267 * Hmm. We got an UDP packet to a port to which we
1268 * don't wanna listen. Ignore it.
1274 LIMIT_NETDEBUG(KERN_DEBUG
"UDP%s: short packet: From %u.%u.%u.%u:%u %d/%d to %u.%u.%u.%u:%u\n",
1275 proto
== IPPROTO_UDPLITE
? "-Lite" : "",
1286 * RFC1122: OK. Discards the bad packet silently (as far as
1287 * the network is concerned, anyway) as per 4.1.3.4 (MUST).
1289 LIMIT_NETDEBUG(KERN_DEBUG
"UDP%s: bad checksum. From %d.%d.%d.%d:%d to %d.%d.%d.%d:%d ulen %d\n",
1290 proto
== IPPROTO_UDPLITE
? "-Lite" : "",
1297 UDP_INC_STATS_BH(UDP_MIB_INERRORS
, proto
== IPPROTO_UDPLITE
);
1302 int udp_rcv(struct sk_buff
*skb
)
1304 return __udp4_lib_rcv(skb
, udp_hash
, IPPROTO_UDP
);
1307 int udp_destroy_sock(struct sock
*sk
)
1310 udp_flush_pending_frames(sk
);
1316 * Socket option code for UDP
1318 int udp_lib_setsockopt(struct sock
*sk
, int level
, int optname
,
1319 char __user
*optval
, int optlen
,
1320 int (*push_pending_frames
)(struct sock
*))
1322 struct udp_sock
*up
= udp_sk(sk
);
1326 if (optlen
<sizeof(int))
1329 if (get_user(val
, (int __user
*)optval
))
1339 (*push_pending_frames
)(sk
);
1347 case UDP_ENCAP_ESPINUDP
:
1348 case UDP_ENCAP_ESPINUDP_NON_IKE
:
1349 up
->encap_type
= val
;
1358 * UDP-Lite's partial checksum coverage (RFC 3828).
1360 /* The sender sets actual checksum coverage length via this option.
1361 * The case coverage > packet length is handled by send module. */
1362 case UDPLITE_SEND_CSCOV
:
1363 if (!up
->pcflag
) /* Disable the option on UDP sockets */
1364 return -ENOPROTOOPT
;
1365 if (val
!= 0 && val
< 8) /* Illegal coverage: use default (8) */
1368 up
->pcflag
|= UDPLITE_SEND_CC
;
1371 /* The receiver specifies a minimum checksum coverage value. To make
1372 * sense, this should be set to at least 8 (as done below). If zero is
1373 * used, this again means full checksum coverage. */
1374 case UDPLITE_RECV_CSCOV
:
1375 if (!up
->pcflag
) /* Disable the option on UDP sockets */
1376 return -ENOPROTOOPT
;
1377 if (val
!= 0 && val
< 8) /* Avoid silly minimal values. */
1380 up
->pcflag
|= UDPLITE_RECV_CC
;
1391 int udp_setsockopt(struct sock
*sk
, int level
, int optname
,
1392 char __user
*optval
, int optlen
)
1394 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1395 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1396 udp_push_pending_frames
);
1397 return ip_setsockopt(sk
, level
, optname
, optval
, optlen
);
1400 #ifdef CONFIG_COMPAT
1401 int compat_udp_setsockopt(struct sock
*sk
, int level
, int optname
,
1402 char __user
*optval
, int optlen
)
1404 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1405 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1406 udp_push_pending_frames
);
1407 return compat_ip_setsockopt(sk
, level
, optname
, optval
, optlen
);
1411 int udp_lib_getsockopt(struct sock
*sk
, int level
, int optname
,
1412 char __user
*optval
, int __user
*optlen
)
1414 struct udp_sock
*up
= udp_sk(sk
);
1417 if (get_user(len
,optlen
))
1420 len
= min_t(unsigned int, len
, sizeof(int));
1431 val
= up
->encap_type
;
1434 /* The following two cannot be changed on UDP sockets, the return is
1435 * always 0 (which corresponds to the full checksum coverage of UDP). */
1436 case UDPLITE_SEND_CSCOV
:
1440 case UDPLITE_RECV_CSCOV
:
1445 return -ENOPROTOOPT
;
1448 if (put_user(len
, optlen
))
1450 if (copy_to_user(optval
, &val
,len
))
1455 int udp_getsockopt(struct sock
*sk
, int level
, int optname
,
1456 char __user
*optval
, int __user
*optlen
)
1458 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1459 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1460 return ip_getsockopt(sk
, level
, optname
, optval
, optlen
);
1463 #ifdef CONFIG_COMPAT
1464 int compat_udp_getsockopt(struct sock
*sk
, int level
, int optname
,
1465 char __user
*optval
, int __user
*optlen
)
1467 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1468 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1469 return compat_ip_getsockopt(sk
, level
, optname
, optval
, optlen
);
1473 * udp_poll - wait for a UDP event.
1474 * @file - file struct
1476 * @wait - poll table
1478 * This is same as datagram poll, except for the special case of
1479 * blocking sockets. If application is using a blocking fd
1480 * and a packet with checksum error is in the queue;
1481 * then it could get return from select indicating data available
1482 * but then block when reading it. Add special case code
1483 * to work around these arguably broken applications.
1485 unsigned int udp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
1487 unsigned int mask
= datagram_poll(file
, sock
, wait
);
1488 struct sock
*sk
= sock
->sk
;
1489 int is_lite
= IS_UDPLITE(sk
);
1491 /* Check for false positives due to checksum errors */
1492 if ( (mask
& POLLRDNORM
) &&
1493 !(file
->f_flags
& O_NONBLOCK
) &&
1494 !(sk
->sk_shutdown
& RCV_SHUTDOWN
)){
1495 struct sk_buff_head
*rcvq
= &sk
->sk_receive_queue
;
1496 struct sk_buff
*skb
;
1498 spin_lock_bh(&rcvq
->lock
);
1499 while ((skb
= skb_peek(rcvq
)) != NULL
&&
1500 udp_lib_checksum_complete(skb
)) {
1501 UDP_INC_STATS_BH(UDP_MIB_INERRORS
, is_lite
);
1502 __skb_unlink(skb
, rcvq
);
1505 spin_unlock_bh(&rcvq
->lock
);
1507 /* nothing to see, move along */
1509 mask
&= ~(POLLIN
| POLLRDNORM
);
1516 struct proto udp_prot
= {
1518 .owner
= THIS_MODULE
,
1519 .close
= udp_lib_close
,
1520 .connect
= ip4_datagram_connect
,
1521 .disconnect
= udp_disconnect
,
1523 .destroy
= udp_destroy_sock
,
1524 .setsockopt
= udp_setsockopt
,
1525 .getsockopt
= udp_getsockopt
,
1526 .sendmsg
= udp_sendmsg
,
1527 .recvmsg
= udp_recvmsg
,
1528 .sendpage
= udp_sendpage
,
1529 .backlog_rcv
= udp_queue_rcv_skb
,
1530 .hash
= udp_lib_hash
,
1531 .unhash
= udp_lib_unhash
,
1532 .get_port
= udp_v4_get_port
,
1533 .obj_size
= sizeof(struct udp_sock
),
1534 #ifdef CONFIG_COMPAT
1535 .compat_setsockopt
= compat_udp_setsockopt
,
1536 .compat_getsockopt
= compat_udp_getsockopt
,
1540 /* ------------------------------------------------------------------------ */
1541 #ifdef CONFIG_PROC_FS
1543 static struct sock
*udp_get_first(struct seq_file
*seq
)
1546 struct udp_iter_state
*state
= seq
->private;
1548 for (state
->bucket
= 0; state
->bucket
< UDP_HTABLE_SIZE
; ++state
->bucket
) {
1549 struct hlist_node
*node
;
1550 sk_for_each(sk
, node
, state
->hashtable
+ state
->bucket
) {
1551 if (sk
->sk_family
== state
->family
)
1560 static struct sock
*udp_get_next(struct seq_file
*seq
, struct sock
*sk
)
1562 struct udp_iter_state
*state
= seq
->private;
1568 } while (sk
&& sk
->sk_family
!= state
->family
);
1570 if (!sk
&& ++state
->bucket
< UDP_HTABLE_SIZE
) {
1571 sk
= sk_head(state
->hashtable
+ state
->bucket
);
1577 static struct sock
*udp_get_idx(struct seq_file
*seq
, loff_t pos
)
1579 struct sock
*sk
= udp_get_first(seq
);
1582 while (pos
&& (sk
= udp_get_next(seq
, sk
)) != NULL
)
1584 return pos
? NULL
: sk
;
1587 static void *udp_seq_start(struct seq_file
*seq
, loff_t
*pos
)
1589 read_lock(&udp_hash_lock
);
1590 return *pos
? udp_get_idx(seq
, *pos
-1) : (void *)1;
1593 static void *udp_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
1598 sk
= udp_get_idx(seq
, 0);
1600 sk
= udp_get_next(seq
, v
);
1606 static void udp_seq_stop(struct seq_file
*seq
, void *v
)
1608 read_unlock(&udp_hash_lock
);
1611 static int udp_seq_open(struct inode
*inode
, struct file
*file
)
1613 struct udp_seq_afinfo
*afinfo
= PDE(inode
)->data
;
1614 struct seq_file
*seq
;
1616 struct udp_iter_state
*s
= kzalloc(sizeof(*s
), GFP_KERNEL
);
1620 s
->family
= afinfo
->family
;
1621 s
->hashtable
= afinfo
->hashtable
;
1622 s
->seq_ops
.start
= udp_seq_start
;
1623 s
->seq_ops
.next
= udp_seq_next
;
1624 s
->seq_ops
.show
= afinfo
->seq_show
;
1625 s
->seq_ops
.stop
= udp_seq_stop
;
1627 rc
= seq_open(file
, &s
->seq_ops
);
1631 seq
= file
->private_data
;
1640 /* ------------------------------------------------------------------------ */
1641 int udp_proc_register(struct udp_seq_afinfo
*afinfo
)
1643 struct proc_dir_entry
*p
;
1648 afinfo
->seq_fops
->owner
= afinfo
->owner
;
1649 afinfo
->seq_fops
->open
= udp_seq_open
;
1650 afinfo
->seq_fops
->read
= seq_read
;
1651 afinfo
->seq_fops
->llseek
= seq_lseek
;
1652 afinfo
->seq_fops
->release
= seq_release_private
;
1654 p
= proc_net_fops_create(afinfo
->name
, S_IRUGO
, afinfo
->seq_fops
);
1662 void udp_proc_unregister(struct udp_seq_afinfo
*afinfo
)
1666 proc_net_remove(afinfo
->name
);
1667 memset(afinfo
->seq_fops
, 0, sizeof(*afinfo
->seq_fops
));
1670 /* ------------------------------------------------------------------------ */
1671 static void udp4_format_sock(struct sock
*sp
, char *tmpbuf
, int bucket
)
1673 struct inet_sock
*inet
= inet_sk(sp
);
1674 __be32 dest
= inet
->daddr
;
1675 __be32 src
= inet
->rcv_saddr
;
1676 __u16 destp
= ntohs(inet
->dport
);
1677 __u16 srcp
= ntohs(inet
->sport
);
1679 sprintf(tmpbuf
, "%4d: %08X:%04X %08X:%04X"
1680 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
1681 bucket
, src
, srcp
, dest
, destp
, sp
->sk_state
,
1682 atomic_read(&sp
->sk_wmem_alloc
),
1683 atomic_read(&sp
->sk_rmem_alloc
),
1684 0, 0L, 0, sock_i_uid(sp
), 0, sock_i_ino(sp
),
1685 atomic_read(&sp
->sk_refcnt
), sp
);
1688 int udp4_seq_show(struct seq_file
*seq
, void *v
)
1690 if (v
== SEQ_START_TOKEN
)
1691 seq_printf(seq
, "%-127s\n",
1692 " sl local_address rem_address st tx_queue "
1693 "rx_queue tr tm->when retrnsmt uid timeout "
1697 struct udp_iter_state
*state
= seq
->private;
1699 udp4_format_sock(v
, tmpbuf
, state
->bucket
);
1700 seq_printf(seq
, "%-127s\n", tmpbuf
);
1705 /* ------------------------------------------------------------------------ */
1706 static struct file_operations udp4_seq_fops
;
1707 static struct udp_seq_afinfo udp4_seq_afinfo
= {
1708 .owner
= THIS_MODULE
,
1711 .hashtable
= udp_hash
,
1712 .seq_show
= udp4_seq_show
,
1713 .seq_fops
= &udp4_seq_fops
,
1716 int __init
udp4_proc_init(void)
1718 return udp_proc_register(&udp4_seq_afinfo
);
1721 void udp4_proc_exit(void)
1723 udp_proc_unregister(&udp4_seq_afinfo
);
1725 #endif /* CONFIG_PROC_FS */
1727 EXPORT_SYMBOL(udp_disconnect
);
1728 EXPORT_SYMBOL(udp_hash
);
1729 EXPORT_SYMBOL(udp_hash_lock
);
1730 EXPORT_SYMBOL(udp_ioctl
);
1731 EXPORT_SYMBOL(udp_get_port
);
1732 EXPORT_SYMBOL(udp_prot
);
1733 EXPORT_SYMBOL(udp_sendmsg
);
1734 EXPORT_SYMBOL(udp_lib_getsockopt
);
1735 EXPORT_SYMBOL(udp_lib_setsockopt
);
1736 EXPORT_SYMBOL(udp_poll
);
1738 #ifdef CONFIG_PROC_FS
1739 EXPORT_SYMBOL(udp_proc_register
);
1740 EXPORT_SYMBOL(udp_proc_unregister
);