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 (inet_sk(sk
)->num
== 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
; i
++, result
+= UDP_HTABLE_SIZE
) {
179 if (result
> sysctl_local_port_range
[1])
180 result
= sysctl_local_port_range
[0]
181 + ((result
- sysctl_local_port_range
[0]) &
182 (UDP_HTABLE_SIZE
- 1));
183 if (! __udp_lib_lport_inuse(result
, udptable
))
186 if (i
>= (1 << 16) / UDP_HTABLE_SIZE
)
189 *port_rover
= snum
= result
;
191 head
= &udptable
[snum
& (UDP_HTABLE_SIZE
- 1)];
193 sk_for_each(sk2
, node
, head
)
194 if (inet_sk(sk2
)->num
== snum
&&
196 (!sk2
->sk_reuse
|| !sk
->sk_reuse
) &&
197 (!sk2
->sk_bound_dev_if
|| !sk
->sk_bound_dev_if
198 || sk2
->sk_bound_dev_if
== sk
->sk_bound_dev_if
) &&
199 (*saddr_comp
)(sk
, sk2
) )
202 inet_sk(sk
)->num
= snum
;
203 if (sk_unhashed(sk
)) {
204 head
= &udptable
[snum
& (UDP_HTABLE_SIZE
- 1)];
205 sk_add_node(sk
, head
);
206 sock_prot_inc_use(sk
->sk_prot
);
210 write_unlock_bh(&udp_hash_lock
);
214 __inline__
int udp_get_port(struct sock
*sk
, unsigned short snum
,
215 int (*scmp
)(const struct sock
*, const struct sock
*))
217 return __udp_lib_get_port(sk
, snum
, udp_hash
, &udp_port_rover
, scmp
);
220 inline int ipv4_rcv_saddr_equal(const struct sock
*sk1
, const struct sock
*sk2
)
222 struct inet_sock
*inet1
= inet_sk(sk1
), *inet2
= inet_sk(sk2
);
224 return ( !ipv6_only_sock(sk2
) &&
225 (!inet1
->rcv_saddr
|| !inet2
->rcv_saddr
||
226 inet1
->rcv_saddr
== inet2
->rcv_saddr
));
229 static inline int udp_v4_get_port(struct sock
*sk
, unsigned short snum
)
231 return udp_get_port(sk
, snum
, ipv4_rcv_saddr_equal
);
234 /* UDP is nearly always wildcards out the wazoo, it makes no sense to try
235 * harder than this. -DaveM
237 static struct sock
*__udp4_lib_lookup(__be32 saddr
, __be16 sport
,
238 __be32 daddr
, __be16 dport
,
239 int dif
, struct hlist_head udptable
[])
241 struct sock
*sk
, *result
= NULL
;
242 struct hlist_node
*node
;
243 unsigned short hnum
= ntohs(dport
);
246 read_lock(&udp_hash_lock
);
247 sk_for_each(sk
, node
, &udptable
[hnum
& (UDP_HTABLE_SIZE
- 1)]) {
248 struct inet_sock
*inet
= inet_sk(sk
);
250 if (inet
->num
== hnum
&& !ipv6_only_sock(sk
)) {
251 int score
= (sk
->sk_family
== PF_INET
? 1 : 0);
252 if (inet
->rcv_saddr
) {
253 if (inet
->rcv_saddr
!= daddr
)
258 if (inet
->daddr
!= saddr
)
263 if (inet
->dport
!= sport
)
267 if (sk
->sk_bound_dev_if
) {
268 if (sk
->sk_bound_dev_if
!= dif
)
275 } else if(score
> badness
) {
283 read_unlock(&udp_hash_lock
);
287 static inline struct sock
*udp_v4_mcast_next(struct sock
*sk
,
288 __be16 loc_port
, __be32 loc_addr
,
289 __be16 rmt_port
, __be32 rmt_addr
,
292 struct hlist_node
*node
;
294 unsigned short hnum
= ntohs(loc_port
);
296 sk_for_each_from(s
, node
) {
297 struct inet_sock
*inet
= inet_sk(s
);
299 if (inet
->num
!= hnum
||
300 (inet
->daddr
&& inet
->daddr
!= rmt_addr
) ||
301 (inet
->dport
!= rmt_port
&& inet
->dport
) ||
302 (inet
->rcv_saddr
&& inet
->rcv_saddr
!= loc_addr
) ||
304 (s
->sk_bound_dev_if
&& s
->sk_bound_dev_if
!= dif
))
306 if (!ip_mc_sf_allow(s
, loc_addr
, rmt_addr
, dif
))
316 * This routine is called by the ICMP module when it gets some
317 * sort of error condition. If err < 0 then the socket should
318 * be closed and the error returned to the user. If err > 0
319 * it's just the icmp type << 8 | icmp code.
320 * Header points to the ip header of the error packet. We move
321 * on past this. Then (as it used to claim before adjustment)
322 * header points to the first 8 bytes of the udp header. We need
323 * to find the appropriate port.
326 void __udp4_lib_err(struct sk_buff
*skb
, u32 info
, struct hlist_head udptable
[])
328 struct inet_sock
*inet
;
329 struct iphdr
*iph
= (struct iphdr
*)skb
->data
;
330 struct udphdr
*uh
= (struct udphdr
*)(skb
->data
+(iph
->ihl
<<2));
331 int type
= skb
->h
.icmph
->type
;
332 int code
= skb
->h
.icmph
->code
;
337 sk
= __udp4_lib_lookup(iph
->daddr
, uh
->dest
, iph
->saddr
, uh
->source
,
338 skb
->dev
->ifindex
, udptable
);
340 ICMP_INC_STATS_BH(ICMP_MIB_INERRORS
);
341 return; /* No socket for error */
350 case ICMP_TIME_EXCEEDED
:
353 case ICMP_SOURCE_QUENCH
:
355 case ICMP_PARAMETERPROB
:
359 case ICMP_DEST_UNREACH
:
360 if (code
== ICMP_FRAG_NEEDED
) { /* Path MTU discovery */
361 if (inet
->pmtudisc
!= IP_PMTUDISC_DONT
) {
369 if (code
<= NR_ICMP_UNREACH
) {
370 harderr
= icmp_err_convert
[code
].fatal
;
371 err
= icmp_err_convert
[code
].errno
;
377 * RFC1122: OK. Passes ICMP errors back to application, as per
380 if (!inet
->recverr
) {
381 if (!harderr
|| sk
->sk_state
!= TCP_ESTABLISHED
)
384 ip_icmp_error(sk
, skb
, err
, uh
->dest
, info
, (u8
*)(uh
+1));
387 sk
->sk_error_report(sk
);
392 __inline__
void udp_err(struct sk_buff
*skb
, u32 info
)
394 return __udp4_lib_err(skb
, info
, udp_hash
);
398 * Throw away all pending data and cancel the corking. Socket is locked.
400 static void udp_flush_pending_frames(struct sock
*sk
)
402 struct udp_sock
*up
= udp_sk(sk
);
407 ip_flush_pending_frames(sk
);
412 * udp4_hwcsum_outgoing - handle outgoing HW checksumming
413 * @sk: socket we are sending on
414 * @skb: sk_buff containing the filled-in UDP header
415 * (checksum field must be zeroed out)
417 static void udp4_hwcsum_outgoing(struct sock
*sk
, struct sk_buff
*skb
,
418 __be32 src
, __be32 dst
, int len
)
421 struct udphdr
*uh
= skb
->h
.uh
;
424 if (skb_queue_len(&sk
->sk_write_queue
) == 1) {
426 * Only one fragment on the socket.
428 skb
->csum_offset
= offsetof(struct udphdr
, check
);
429 uh
->check
= ~csum_tcpudp_magic(src
, dst
, len
, IPPROTO_UDP
, 0);
432 * HW-checksum won't work as there are two or more
433 * fragments on the socket so that all csums of sk_buffs
436 offset
= skb
->h
.raw
- skb
->data
;
437 skb
->csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
439 skb
->ip_summed
= CHECKSUM_NONE
;
441 skb_queue_walk(&sk
->sk_write_queue
, skb
) {
442 csum
= csum_add(csum
, skb
->csum
);
445 uh
->check
= csum_tcpudp_magic(src
, dst
, len
, IPPROTO_UDP
, csum
);
447 uh
->check
= CSUM_MANGLED_0
;
452 * Push out all pending data as one UDP datagram. Socket is locked.
454 static int udp_push_pending_frames(struct sock
*sk
)
456 struct udp_sock
*up
= udp_sk(sk
);
457 struct inet_sock
*inet
= inet_sk(sk
);
458 struct flowi
*fl
= &inet
->cork
.fl
;
464 /* Grab the skbuff where UDP header space exists. */
465 if ((skb
= skb_peek(&sk
->sk_write_queue
)) == NULL
)
469 * Create a UDP header
472 uh
->source
= fl
->fl_ip_sport
;
473 uh
->dest
= fl
->fl_ip_dport
;
474 uh
->len
= htons(up
->len
);
477 if (up
->pcflag
) /* UDP-Lite */
478 csum
= udplite_csum_outgoing(sk
, skb
);
480 else if (sk
->sk_no_check
== UDP_CSUM_NOXMIT
) { /* UDP csum disabled */
482 skb
->ip_summed
= CHECKSUM_NONE
;
485 } else if (skb
->ip_summed
== CHECKSUM_PARTIAL
) { /* UDP hardware csum */
487 udp4_hwcsum_outgoing(sk
, skb
, fl
->fl4_src
,fl
->fl4_dst
, up
->len
);
490 } else /* `normal' UDP */
491 csum
= udp_csum_outgoing(sk
, skb
);
493 /* add protocol-dependent pseudo-header */
494 uh
->check
= csum_tcpudp_magic(fl
->fl4_src
, fl
->fl4_dst
, up
->len
,
495 sk
->sk_protocol
, csum
);
497 uh
->check
= CSUM_MANGLED_0
;
500 err
= ip_push_pending_frames(sk
);
507 int udp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
, struct msghdr
*msg
,
510 struct inet_sock
*inet
= inet_sk(sk
);
511 struct udp_sock
*up
= udp_sk(sk
);
513 struct ipcm_cookie ipc
;
514 struct rtable
*rt
= NULL
;
517 __be32 daddr
, faddr
, saddr
;
520 int err
, is_udplite
= up
->pcflag
;
521 int corkreq
= up
->corkflag
|| msg
->msg_flags
&MSG_MORE
;
522 int (*getfrag
)(void *, char *, int, int, int, struct sk_buff
*);
531 if (msg
->msg_flags
&MSG_OOB
) /* Mirror BSD error message compatibility */
538 * There are pending frames.
539 * The socket lock must be held while it's corked.
542 if (likely(up
->pending
)) {
543 if (unlikely(up
->pending
!= AF_INET
)) {
551 ulen
+= sizeof(struct udphdr
);
554 * Get and verify the address.
557 struct sockaddr_in
* usin
= (struct sockaddr_in
*)msg
->msg_name
;
558 if (msg
->msg_namelen
< sizeof(*usin
))
560 if (usin
->sin_family
!= AF_INET
) {
561 if (usin
->sin_family
!= AF_UNSPEC
)
562 return -EAFNOSUPPORT
;
565 daddr
= usin
->sin_addr
.s_addr
;
566 dport
= usin
->sin_port
;
570 if (sk
->sk_state
!= TCP_ESTABLISHED
)
571 return -EDESTADDRREQ
;
574 /* Open fast path for connected socket.
575 Route will not be used, if at least one option is set.
579 ipc
.addr
= inet
->saddr
;
581 ipc
.oif
= sk
->sk_bound_dev_if
;
582 if (msg
->msg_controllen
) {
583 err
= ip_cmsg_send(msg
, &ipc
);
594 ipc
.addr
= faddr
= daddr
;
596 if (ipc
.opt
&& ipc
.opt
->srr
) {
599 faddr
= ipc
.opt
->faddr
;
602 tos
= RT_TOS(inet
->tos
);
603 if (sock_flag(sk
, SOCK_LOCALROUTE
) ||
604 (msg
->msg_flags
& MSG_DONTROUTE
) ||
605 (ipc
.opt
&& ipc
.opt
->is_strictroute
)) {
610 if (MULTICAST(daddr
)) {
612 ipc
.oif
= inet
->mc_index
;
614 saddr
= inet
->mc_addr
;
619 rt
= (struct rtable
*)sk_dst_check(sk
, 0);
622 struct flowi fl
= { .oif
= ipc
.oif
,
627 .proto
= sk
->sk_protocol
,
629 { .sport
= inet
->sport
,
630 .dport
= dport
} } };
631 security_sk_classify_flow(sk
, &fl
);
632 err
= ip_route_output_flow(&rt
, &fl
, sk
, 1);
637 if ((rt
->rt_flags
& RTCF_BROADCAST
) &&
638 !sock_flag(sk
, SOCK_BROADCAST
))
641 sk_dst_set(sk
, dst_clone(&rt
->u
.dst
));
644 if (msg
->msg_flags
&MSG_CONFIRM
)
650 daddr
= ipc
.addr
= rt
->rt_dst
;
653 if (unlikely(up
->pending
)) {
654 /* The socket is already corked while preparing it. */
655 /* ... which is an evident application bug. --ANK */
658 LIMIT_NETDEBUG(KERN_DEBUG
"udp cork app bug 2\n");
663 * Now cork the socket to pend data.
665 inet
->cork
.fl
.fl4_dst
= daddr
;
666 inet
->cork
.fl
.fl_ip_dport
= dport
;
667 inet
->cork
.fl
.fl4_src
= saddr
;
668 inet
->cork
.fl
.fl_ip_sport
= inet
->sport
;
669 up
->pending
= AF_INET
;
673 getfrag
= is_udplite
? udplite_getfrag
: ip_generic_getfrag
;
674 err
= ip_append_data(sk
, getfrag
, msg
->msg_iov
, ulen
,
675 sizeof(struct udphdr
), &ipc
, rt
,
676 corkreq
? msg
->msg_flags
|MSG_MORE
: msg
->msg_flags
);
678 udp_flush_pending_frames(sk
);
680 err
= udp_push_pending_frames(sk
);
681 else if (unlikely(skb_queue_empty(&sk
->sk_write_queue
)))
690 UDP_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS
, is_udplite
);
694 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
695 * ENOBUFS might not be good (it's not tunable per se), but otherwise
696 * we don't have a good statistic (IpOutDiscards but it can be too many
697 * things). We could add another new stat but at least for now that
698 * seems like overkill.
700 if (err
== -ENOBUFS
|| test_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
)) {
701 UDP_INC_STATS_USER(UDP_MIB_SNDBUFERRORS
, is_udplite
);
706 dst_confirm(&rt
->u
.dst
);
707 if (!(msg
->msg_flags
&MSG_PROBE
) || len
)
708 goto back_from_confirm
;
713 int udp_sendpage(struct sock
*sk
, struct page
*page
, int offset
,
714 size_t size
, int flags
)
716 struct udp_sock
*up
= udp_sk(sk
);
720 struct msghdr msg
= { .msg_flags
= flags
|MSG_MORE
};
722 /* Call udp_sendmsg to specify destination address which
723 * sendpage interface can't pass.
724 * This will succeed only when the socket is connected.
726 ret
= udp_sendmsg(NULL
, sk
, &msg
, 0);
733 if (unlikely(!up
->pending
)) {
736 LIMIT_NETDEBUG(KERN_DEBUG
"udp cork app bug 3\n");
740 ret
= ip_append_page(sk
, page
, offset
, size
, flags
);
741 if (ret
== -EOPNOTSUPP
) {
743 return sock_no_sendpage(sk
->sk_socket
, page
, offset
,
747 udp_flush_pending_frames(sk
);
752 if (!(up
->corkflag
|| (flags
&MSG_MORE
)))
753 ret
= udp_push_pending_frames(sk
);
762 * IOCTL requests applicable to the UDP protocol
765 int udp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
771 int amount
= atomic_read(&sk
->sk_wmem_alloc
);
772 return put_user(amount
, (int __user
*)arg
);
778 unsigned long amount
;
781 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
782 skb
= skb_peek(&sk
->sk_receive_queue
);
785 * We will only return the amount
786 * of this packet since that is all
789 amount
= skb
->len
- sizeof(struct udphdr
);
791 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
792 return put_user(amount
, (int __user
*)arg
);
802 * This should be easy, if there is something there we
803 * return it, otherwise we block.
806 int udp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
, struct msghdr
*msg
,
807 size_t len
, int noblock
, int flags
, int *addr_len
)
809 struct inet_sock
*inet
= inet_sk(sk
);
810 struct sockaddr_in
*sin
= (struct sockaddr_in
*)msg
->msg_name
;
812 int copied
, err
, copy_only
, is_udplite
= IS_UDPLITE(sk
);
815 * Check any passed addresses
818 *addr_len
=sizeof(*sin
);
820 if (flags
& MSG_ERRQUEUE
)
821 return ip_recv_error(sk
, msg
, len
);
824 skb
= skb_recv_datagram(sk
, flags
, noblock
, &err
);
828 copied
= skb
->len
- sizeof(struct udphdr
);
831 msg
->msg_flags
|= MSG_TRUNC
;
835 * Decide whether to checksum and/or copy data.
837 * UDP: checksum may have been computed in HW,
838 * (re-)compute it if message is truncated.
839 * UDP-Lite: always needs to checksum, no HW support.
841 copy_only
= (skb
->ip_summed
==CHECKSUM_UNNECESSARY
);
843 if (is_udplite
|| (!copy_only
&& msg
->msg_flags
&MSG_TRUNC
)) {
844 if (__udp_lib_checksum_complete(skb
))
850 err
= skb_copy_datagram_iovec(skb
, sizeof(struct udphdr
),
851 msg
->msg_iov
, copied
);
853 err
= skb_copy_and_csum_datagram_iovec(skb
, sizeof(struct udphdr
), msg
->msg_iov
);
862 sock_recv_timestamp(msg
, sk
, skb
);
864 /* Copy the address. */
867 sin
->sin_family
= AF_INET
;
868 sin
->sin_port
= skb
->h
.uh
->source
;
869 sin
->sin_addr
.s_addr
= skb
->nh
.iph
->saddr
;
870 memset(sin
->sin_zero
, 0, sizeof(sin
->sin_zero
));
872 if (inet
->cmsg_flags
)
873 ip_cmsg_recv(msg
, skb
);
876 if (flags
& MSG_TRUNC
)
877 err
= skb
->len
- sizeof(struct udphdr
);
880 skb_free_datagram(sk
, skb
);
885 UDP_INC_STATS_BH(UDP_MIB_INERRORS
, is_udplite
);
887 skb_kill_datagram(sk
, skb
, flags
);
895 int udp_disconnect(struct sock
*sk
, int flags
)
897 struct inet_sock
*inet
= inet_sk(sk
);
899 * 1003.1g - break association.
902 sk
->sk_state
= TCP_CLOSE
;
905 sk
->sk_bound_dev_if
= 0;
906 if (!(sk
->sk_userlocks
& SOCK_BINDADDR_LOCK
))
907 inet_reset_saddr(sk
);
909 if (!(sk
->sk_userlocks
& SOCK_BINDPORT_LOCK
)) {
910 sk
->sk_prot
->unhash(sk
);
918 * 1 if the the UDP system should process it
919 * 0 if we should drop this packet
920 * -1 if it should get processed by xfrm4_rcv_encap
922 static int udp_encap_rcv(struct sock
* sk
, struct sk_buff
*skb
)
927 struct udp_sock
*up
= udp_sk(sk
);
934 __u16 encap_type
= up
->encap_type
;
936 /* if we're overly short, let UDP handle it */
937 len
= skb
->len
- sizeof(struct udphdr
);
941 /* if this is not encapsulated socket, then just return now */
945 /* If this is a paged skb, make sure we pull up
946 * whatever data we need to look at. */
947 if (!pskb_may_pull(skb
, sizeof(struct udphdr
) + min(len
, 8)))
950 /* Now we can get the pointers */
952 udpdata
= (__u8
*)uh
+ sizeof(struct udphdr
);
953 udpdata32
= (__be32
*)udpdata
;
955 switch (encap_type
) {
957 case UDP_ENCAP_ESPINUDP
:
958 /* Check if this is a keepalive packet. If so, eat it. */
959 if (len
== 1 && udpdata
[0] == 0xff) {
961 } else if (len
> sizeof(struct ip_esp_hdr
) && udpdata32
[0] != 0 ) {
962 /* ESP Packet without Non-ESP header */
963 len
= sizeof(struct udphdr
);
965 /* Must be an IKE packet.. pass it through */
968 case UDP_ENCAP_ESPINUDP_NON_IKE
:
969 /* Check if this is a keepalive packet. If so, eat it. */
970 if (len
== 1 && udpdata
[0] == 0xff) {
972 } else if (len
> 2 * sizeof(u32
) + sizeof(struct ip_esp_hdr
) &&
973 udpdata32
[0] == 0 && udpdata32
[1] == 0) {
975 /* ESP Packet with Non-IKE marker */
976 len
= sizeof(struct udphdr
) + 2 * sizeof(u32
);
978 /* Must be an IKE packet.. pass it through */
983 /* At this point we are sure that this is an ESPinUDP packet,
984 * so we need to remove 'len' bytes from the packet (the UDP
985 * header and optional ESP marker bytes) and then modify the
986 * protocol to ESP, and then call into the transform receiver.
988 if (skb_cloned(skb
) && pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
))
991 /* Now we can update and verify the packet length... */
993 iphlen
= iph
->ihl
<< 2;
994 iph
->tot_len
= htons(ntohs(iph
->tot_len
) - len
);
995 if (skb
->len
< iphlen
+ len
) {
996 /* packet is too small!?! */
1000 /* pull the data buffer up to the ESP header and set the
1001 * transport header to point to ESP. Keep UDP on the stack
1004 skb
->h
.raw
= skb_pull(skb
, len
);
1006 /* modify the protocol (it's ESP!) */
1007 iph
->protocol
= IPPROTO_ESP
;
1009 /* and let the caller know to send this into the ESP processor... */
1017 * >0: "udp encap" protocol resubmission
1019 * Note that in the success and error cases, the skb is assumed to
1020 * have either been requeued or freed.
1022 int udp_queue_rcv_skb(struct sock
* sk
, struct sk_buff
*skb
)
1024 struct udp_sock
*up
= udp_sk(sk
);
1028 * Charge it to the socket, dropping if the queue is full.
1030 if (!xfrm4_policy_check(sk
, XFRM_POLICY_IN
, skb
))
1034 if (up
->encap_type
) {
1036 * This is an encapsulation socket, so let's see if this is
1037 * an encapsulated packet.
1038 * If it's a keepalive packet, then just eat it.
1039 * If it's an encapsulateed packet, then pass it to the
1040 * IPsec xfrm input and return the response
1041 * appropriately. Otherwise, just fall through and
1042 * pass this up the UDP socket.
1046 ret
= udp_encap_rcv(sk
, skb
);
1048 /* Eat the packet .. */
1053 /* process the ESP packet */
1054 ret
= xfrm4_rcv_encap(skb
, up
->encap_type
);
1055 UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS
, up
->pcflag
);
1058 /* FALLTHROUGH -- it's a UDP Packet */
1062 * UDP-Lite specific tests, ignored on UDP sockets
1064 if ((up
->pcflag
& UDPLITE_RECV_CC
) && UDP_SKB_CB(skb
)->partial_cov
) {
1067 * MIB statistics other than incrementing the error count are
1068 * disabled for the following two types of errors: these depend
1069 * on the application settings, not on the functioning of the
1070 * protocol stack as such.
1072 * RFC 3828 here recommends (sec 3.3): "There should also be a
1073 * way ... to ... at least let the receiving application block
1074 * delivery of packets with coverage values less than a value
1075 * provided by the application."
1077 if (up
->pcrlen
== 0) { /* full coverage was set */
1078 LIMIT_NETDEBUG(KERN_WARNING
"UDPLITE: partial coverage "
1079 "%d while full coverage %d requested\n",
1080 UDP_SKB_CB(skb
)->cscov
, skb
->len
);
1083 /* The next case involves violating the min. coverage requested
1084 * by the receiver. This is subtle: if receiver wants x and x is
1085 * greater than the buffersize/MTU then receiver will complain
1086 * that it wants x while sender emits packets of smaller size y.
1087 * Therefore the above ...()->partial_cov statement is essential.
1089 if (UDP_SKB_CB(skb
)->cscov
< up
->pcrlen
) {
1090 LIMIT_NETDEBUG(KERN_WARNING
1091 "UDPLITE: coverage %d too small, need min %d\n",
1092 UDP_SKB_CB(skb
)->cscov
, up
->pcrlen
);
1097 if (sk
->sk_filter
&& skb
->ip_summed
!= CHECKSUM_UNNECESSARY
) {
1098 if (__udp_lib_checksum_complete(skb
))
1100 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
1103 if ((rc
= sock_queue_rcv_skb(sk
,skb
)) < 0) {
1104 /* Note that an ENOMEM error is charged twice */
1106 UDP_INC_STATS_BH(UDP_MIB_RCVBUFERRORS
, up
->pcflag
);
1110 UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS
, up
->pcflag
);
1114 UDP_INC_STATS_BH(UDP_MIB_INERRORS
, up
->pcflag
);
1120 * Multicasts and broadcasts go to each listener.
1122 * Note: called only from the BH handler context,
1123 * so we don't need to lock the hashes.
1125 static int __udp4_lib_mcast_deliver(struct sk_buff
*skb
,
1127 __be32 saddr
, __be32 daddr
,
1128 struct hlist_head udptable
[])
1133 read_lock(&udp_hash_lock
);
1134 sk
= sk_head(&udptable
[ntohs(uh
->dest
) & (UDP_HTABLE_SIZE
- 1)]);
1135 dif
= skb
->dev
->ifindex
;
1136 sk
= udp_v4_mcast_next(sk
, uh
->dest
, daddr
, uh
->source
, saddr
, dif
);
1138 struct sock
*sknext
= NULL
;
1141 struct sk_buff
*skb1
= skb
;
1143 sknext
= udp_v4_mcast_next(sk_next(sk
), uh
->dest
, daddr
,
1144 uh
->source
, saddr
, dif
);
1146 skb1
= skb_clone(skb
, GFP_ATOMIC
);
1149 int ret
= udp_queue_rcv_skb(sk
, skb1
);
1151 /* we should probably re-process instead
1152 * of dropping packets here. */
1159 read_unlock(&udp_hash_lock
);
1163 /* Initialize UDP checksum. If exited with zero value (success),
1164 * CHECKSUM_UNNECESSARY means, that no more checks are required.
1165 * Otherwise, csum completion requires chacksumming packet body,
1166 * including udp header and folding it to skb->csum.
1168 static inline void udp4_csum_init(struct sk_buff
*skb
, struct udphdr
*uh
)
1170 if (uh
->check
== 0) {
1171 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
1172 } else if (skb
->ip_summed
== CHECKSUM_COMPLETE
) {
1173 if (!csum_tcpudp_magic(skb
->nh
.iph
->saddr
, skb
->nh
.iph
->daddr
,
1174 skb
->len
, IPPROTO_UDP
, skb
->csum
))
1175 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
1177 if (skb
->ip_summed
!= CHECKSUM_UNNECESSARY
)
1178 skb
->csum
= csum_tcpudp_nofold(skb
->nh
.iph
->saddr
,
1180 skb
->len
, IPPROTO_UDP
, 0);
1181 /* Probably, we should checksum udp header (it should be in cache
1182 * in any case) and data in tiny packets (< rx copybreak).
1185 /* UDP = UDP-Lite with a non-partial checksum coverage */
1186 UDP_SKB_CB(skb
)->partial_cov
= 0;
1190 * All we need to do is get the socket, and then do a checksum.
1193 int __udp4_lib_rcv(struct sk_buff
*skb
, struct hlist_head udptable
[],
1197 struct udphdr
*uh
= skb
->h
.uh
;
1198 unsigned short ulen
;
1199 struct rtable
*rt
= (struct rtable
*)skb
->dst
;
1200 __be32 saddr
= skb
->nh
.iph
->saddr
;
1201 __be32 daddr
= skb
->nh
.iph
->daddr
;
1204 * Validate the packet.
1206 if (!pskb_may_pull(skb
, sizeof(struct udphdr
)))
1207 goto drop
; /* No space for header. */
1209 ulen
= ntohs(uh
->len
);
1210 if (ulen
> skb
->len
)
1213 if(! is_udplite
) { /* UDP validates ulen. */
1215 if (ulen
< sizeof(*uh
) || pskb_trim_rcsum(skb
, ulen
))
1218 udp4_csum_init(skb
, uh
);
1220 } else { /* UDP-Lite validates cscov. */
1221 if (udplite4_csum_init(skb
, uh
))
1225 if(rt
->rt_flags
& (RTCF_BROADCAST
|RTCF_MULTICAST
))
1226 return __udp4_lib_mcast_deliver(skb
, uh
, saddr
, daddr
, udptable
);
1228 sk
= __udp4_lib_lookup(saddr
, uh
->source
, daddr
, uh
->dest
,
1229 skb
->dev
->ifindex
, udptable
);
1232 int ret
= udp_queue_rcv_skb(sk
, skb
);
1235 /* a return value > 0 means to resubmit the input, but
1236 * it wants the return to be -protocol, or 0
1243 if (!xfrm4_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
1247 /* No socket. Drop packet silently, if checksum is wrong */
1248 if (udp_lib_checksum_complete(skb
))
1251 UDP_INC_STATS_BH(UDP_MIB_NOPORTS
, is_udplite
);
1252 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_PORT_UNREACH
, 0);
1255 * Hmm. We got an UDP packet to a port to which we
1256 * don't wanna listen. Ignore it.
1262 LIMIT_NETDEBUG(KERN_DEBUG
"UDP%s: short packet: From %u.%u.%u.%u:%u %d/%d to %u.%u.%u.%u:%u\n",
1263 is_udplite
? "-Lite" : "",
1274 * RFC1122: OK. Discards the bad packet silently (as far as
1275 * the network is concerned, anyway) as per 4.1.3.4 (MUST).
1277 LIMIT_NETDEBUG(KERN_DEBUG
"UDP%s: bad checksum. From %d.%d.%d.%d:%d to %d.%d.%d.%d:%d ulen %d\n",
1278 is_udplite
? "-Lite" : "",
1285 UDP_INC_STATS_BH(UDP_MIB_INERRORS
, is_udplite
);
1290 __inline__
int udp_rcv(struct sk_buff
*skb
)
1292 return __udp4_lib_rcv(skb
, udp_hash
, 0);
1295 int udp_destroy_sock(struct sock
*sk
)
1298 udp_flush_pending_frames(sk
);
1304 * Socket option code for UDP
1306 int udp_lib_setsockopt(struct sock
*sk
, int level
, int optname
,
1307 char __user
*optval
, int optlen
,
1308 int (*push_pending_frames
)(struct sock
*))
1310 struct udp_sock
*up
= udp_sk(sk
);
1314 if(optlen
<sizeof(int))
1317 if (get_user(val
, (int __user
*)optval
))
1327 (*push_pending_frames
)(sk
);
1335 case UDP_ENCAP_ESPINUDP
:
1336 case UDP_ENCAP_ESPINUDP_NON_IKE
:
1337 up
->encap_type
= val
;
1346 * UDP-Lite's partial checksum coverage (RFC 3828).
1348 /* The sender sets actual checksum coverage length via this option.
1349 * The case coverage > packet length is handled by send module. */
1350 case UDPLITE_SEND_CSCOV
:
1351 if (!up
->pcflag
) /* Disable the option on UDP sockets */
1352 return -ENOPROTOOPT
;
1353 if (val
!= 0 && val
< 8) /* Illegal coverage: use default (8) */
1356 up
->pcflag
|= UDPLITE_SEND_CC
;
1359 /* The receiver specifies a minimum checksum coverage value. To make
1360 * sense, this should be set to at least 8 (as done below). If zero is
1361 * used, this again means full checksum coverage. */
1362 case UDPLITE_RECV_CSCOV
:
1363 if (!up
->pcflag
) /* Disable the option on UDP sockets */
1364 return -ENOPROTOOPT
;
1365 if (val
!= 0 && val
< 8) /* Avoid silly minimal values. */
1368 up
->pcflag
|= UDPLITE_RECV_CC
;
1379 int udp_setsockopt(struct sock
*sk
, int level
, int optname
,
1380 char __user
*optval
, int optlen
)
1382 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1383 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1384 udp_push_pending_frames
);
1385 return ip_setsockopt(sk
, level
, optname
, optval
, optlen
);
1388 #ifdef CONFIG_COMPAT
1389 int compat_udp_setsockopt(struct sock
*sk
, int level
, int optname
,
1390 char __user
*optval
, int optlen
)
1392 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1393 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1394 udp_push_pending_frames
);
1395 return compat_ip_setsockopt(sk
, level
, optname
, optval
, optlen
);
1399 int udp_lib_getsockopt(struct sock
*sk
, int level
, int optname
,
1400 char __user
*optval
, int __user
*optlen
)
1402 struct udp_sock
*up
= udp_sk(sk
);
1405 if(get_user(len
,optlen
))
1408 len
= min_t(unsigned int, len
, sizeof(int));
1419 val
= up
->encap_type
;
1422 /* The following two cannot be changed on UDP sockets, the return is
1423 * always 0 (which corresponds to the full checksum coverage of UDP). */
1424 case UDPLITE_SEND_CSCOV
:
1428 case UDPLITE_RECV_CSCOV
:
1433 return -ENOPROTOOPT
;
1436 if(put_user(len
, optlen
))
1438 if(copy_to_user(optval
, &val
,len
))
1443 int udp_getsockopt(struct sock
*sk
, int level
, int optname
,
1444 char __user
*optval
, int __user
*optlen
)
1446 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1447 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1448 return ip_getsockopt(sk
, level
, optname
, optval
, optlen
);
1451 #ifdef CONFIG_COMPAT
1452 int compat_udp_getsockopt(struct sock
*sk
, int level
, int optname
,
1453 char __user
*optval
, int __user
*optlen
)
1455 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1456 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1457 return compat_ip_getsockopt(sk
, level
, optname
, optval
, optlen
);
1461 * udp_poll - wait for a UDP event.
1462 * @file - file struct
1464 * @wait - poll table
1466 * This is same as datagram poll, except for the special case of
1467 * blocking sockets. If application is using a blocking fd
1468 * and a packet with checksum error is in the queue;
1469 * then it could get return from select indicating data available
1470 * but then block when reading it. Add special case code
1471 * to work around these arguably broken applications.
1473 unsigned int udp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
1475 unsigned int mask
= datagram_poll(file
, sock
, wait
);
1476 struct sock
*sk
= sock
->sk
;
1477 int is_lite
= IS_UDPLITE(sk
);
1479 /* Check for false positives due to checksum errors */
1480 if ( (mask
& POLLRDNORM
) &&
1481 !(file
->f_flags
& O_NONBLOCK
) &&
1482 !(sk
->sk_shutdown
& RCV_SHUTDOWN
)){
1483 struct sk_buff_head
*rcvq
= &sk
->sk_receive_queue
;
1484 struct sk_buff
*skb
;
1486 spin_lock_bh(&rcvq
->lock
);
1487 while ((skb
= skb_peek(rcvq
)) != NULL
) {
1488 if (udp_lib_checksum_complete(skb
)) {
1489 UDP_INC_STATS_BH(UDP_MIB_INERRORS
, is_lite
);
1490 __skb_unlink(skb
, rcvq
);
1493 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
1497 spin_unlock_bh(&rcvq
->lock
);
1499 /* nothing to see, move along */
1501 mask
&= ~(POLLIN
| POLLRDNORM
);
1508 struct proto udp_prot
= {
1510 .owner
= THIS_MODULE
,
1511 .close
= udp_lib_close
,
1512 .connect
= ip4_datagram_connect
,
1513 .disconnect
= udp_disconnect
,
1515 .destroy
= udp_destroy_sock
,
1516 .setsockopt
= udp_setsockopt
,
1517 .getsockopt
= udp_getsockopt
,
1518 .sendmsg
= udp_sendmsg
,
1519 .recvmsg
= udp_recvmsg
,
1520 .sendpage
= udp_sendpage
,
1521 .backlog_rcv
= udp_queue_rcv_skb
,
1522 .hash
= udp_lib_hash
,
1523 .unhash
= udp_lib_unhash
,
1524 .get_port
= udp_v4_get_port
,
1525 .obj_size
= sizeof(struct udp_sock
),
1526 #ifdef CONFIG_COMPAT
1527 .compat_setsockopt
= compat_udp_setsockopt
,
1528 .compat_getsockopt
= compat_udp_getsockopt
,
1532 /* ------------------------------------------------------------------------ */
1533 #ifdef CONFIG_PROC_FS
1535 static struct sock
*udp_get_first(struct seq_file
*seq
)
1538 struct udp_iter_state
*state
= seq
->private;
1540 for (state
->bucket
= 0; state
->bucket
< UDP_HTABLE_SIZE
; ++state
->bucket
) {
1541 struct hlist_node
*node
;
1542 sk_for_each(sk
, node
, state
->hashtable
+ state
->bucket
) {
1543 if (sk
->sk_family
== state
->family
)
1552 static struct sock
*udp_get_next(struct seq_file
*seq
, struct sock
*sk
)
1554 struct udp_iter_state
*state
= seq
->private;
1560 } while (sk
&& sk
->sk_family
!= state
->family
);
1562 if (!sk
&& ++state
->bucket
< UDP_HTABLE_SIZE
) {
1563 sk
= sk_head(state
->hashtable
+ state
->bucket
);
1569 static struct sock
*udp_get_idx(struct seq_file
*seq
, loff_t pos
)
1571 struct sock
*sk
= udp_get_first(seq
);
1574 while(pos
&& (sk
= udp_get_next(seq
, sk
)) != NULL
)
1576 return pos
? NULL
: sk
;
1579 static void *udp_seq_start(struct seq_file
*seq
, loff_t
*pos
)
1581 read_lock(&udp_hash_lock
);
1582 return *pos
? udp_get_idx(seq
, *pos
-1) : (void *)1;
1585 static void *udp_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
1590 sk
= udp_get_idx(seq
, 0);
1592 sk
= udp_get_next(seq
, v
);
1598 static void udp_seq_stop(struct seq_file
*seq
, void *v
)
1600 read_unlock(&udp_hash_lock
);
1603 static int udp_seq_open(struct inode
*inode
, struct file
*file
)
1605 struct udp_seq_afinfo
*afinfo
= PDE(inode
)->data
;
1606 struct seq_file
*seq
;
1608 struct udp_iter_state
*s
= kzalloc(sizeof(*s
), GFP_KERNEL
);
1612 s
->family
= afinfo
->family
;
1613 s
->hashtable
= afinfo
->hashtable
;
1614 s
->seq_ops
.start
= udp_seq_start
;
1615 s
->seq_ops
.next
= udp_seq_next
;
1616 s
->seq_ops
.show
= afinfo
->seq_show
;
1617 s
->seq_ops
.stop
= udp_seq_stop
;
1619 rc
= seq_open(file
, &s
->seq_ops
);
1623 seq
= file
->private_data
;
1632 /* ------------------------------------------------------------------------ */
1633 int udp_proc_register(struct udp_seq_afinfo
*afinfo
)
1635 struct proc_dir_entry
*p
;
1640 afinfo
->seq_fops
->owner
= afinfo
->owner
;
1641 afinfo
->seq_fops
->open
= udp_seq_open
;
1642 afinfo
->seq_fops
->read
= seq_read
;
1643 afinfo
->seq_fops
->llseek
= seq_lseek
;
1644 afinfo
->seq_fops
->release
= seq_release_private
;
1646 p
= proc_net_fops_create(afinfo
->name
, S_IRUGO
, afinfo
->seq_fops
);
1654 void udp_proc_unregister(struct udp_seq_afinfo
*afinfo
)
1658 proc_net_remove(afinfo
->name
);
1659 memset(afinfo
->seq_fops
, 0, sizeof(*afinfo
->seq_fops
));
1662 /* ------------------------------------------------------------------------ */
1663 static void udp4_format_sock(struct sock
*sp
, char *tmpbuf
, int bucket
)
1665 struct inet_sock
*inet
= inet_sk(sp
);
1666 __be32 dest
= inet
->daddr
;
1667 __be32 src
= inet
->rcv_saddr
;
1668 __u16 destp
= ntohs(inet
->dport
);
1669 __u16 srcp
= ntohs(inet
->sport
);
1671 sprintf(tmpbuf
, "%4d: %08X:%04X %08X:%04X"
1672 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
1673 bucket
, src
, srcp
, dest
, destp
, sp
->sk_state
,
1674 atomic_read(&sp
->sk_wmem_alloc
),
1675 atomic_read(&sp
->sk_rmem_alloc
),
1676 0, 0L, 0, sock_i_uid(sp
), 0, sock_i_ino(sp
),
1677 atomic_read(&sp
->sk_refcnt
), sp
);
1680 int udp4_seq_show(struct seq_file
*seq
, void *v
)
1682 if (v
== SEQ_START_TOKEN
)
1683 seq_printf(seq
, "%-127s\n",
1684 " sl local_address rem_address st tx_queue "
1685 "rx_queue tr tm->when retrnsmt uid timeout "
1689 struct udp_iter_state
*state
= seq
->private;
1691 udp4_format_sock(v
, tmpbuf
, state
->bucket
);
1692 seq_printf(seq
, "%-127s\n", tmpbuf
);
1697 /* ------------------------------------------------------------------------ */
1698 static struct file_operations udp4_seq_fops
;
1699 static struct udp_seq_afinfo udp4_seq_afinfo
= {
1700 .owner
= THIS_MODULE
,
1703 .hashtable
= udp_hash
,
1704 .seq_show
= udp4_seq_show
,
1705 .seq_fops
= &udp4_seq_fops
,
1708 int __init
udp4_proc_init(void)
1710 return udp_proc_register(&udp4_seq_afinfo
);
1713 void udp4_proc_exit(void)
1715 udp_proc_unregister(&udp4_seq_afinfo
);
1717 #endif /* CONFIG_PROC_FS */
1719 EXPORT_SYMBOL(udp_disconnect
);
1720 EXPORT_SYMBOL(udp_hash
);
1721 EXPORT_SYMBOL(udp_hash_lock
);
1722 EXPORT_SYMBOL(udp_ioctl
);
1723 EXPORT_SYMBOL(udp_get_port
);
1724 EXPORT_SYMBOL(udp_prot
);
1725 EXPORT_SYMBOL(udp_sendmsg
);
1726 EXPORT_SYMBOL(udp_lib_getsockopt
);
1727 EXPORT_SYMBOL(udp_lib_setsockopt
);
1728 EXPORT_SYMBOL(udp_poll
);
1730 #ifdef CONFIG_PROC_FS
1731 EXPORT_SYMBOL(udp_proc_register
);
1732 EXPORT_SYMBOL(udp_proc_unregister
);