3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * Based on linux/ipv4/udp.c
10 * $Id: udp.c,v 1.65 2002/02/01 22:01:04 davem Exp $
13 * Hideaki YOSHIFUJI : sin6_scope_id support
14 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
15 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
16 * a single port at the same time.
17 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
18 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
20 * This program is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU General Public License
22 * as published by the Free Software Foundation; either version
23 * 2 of the License, or (at your option) any later version.
26 #include <linux/errno.h>
27 #include <linux/types.h>
28 #include <linux/socket.h>
29 #include <linux/sockios.h>
30 #include <linux/net.h>
31 #include <linux/in6.h>
32 #include <linux/netdevice.h>
33 #include <linux/if_arp.h>
34 #include <linux/ipv6.h>
35 #include <linux/icmpv6.h>
36 #include <linux/init.h>
37 #include <linux/module.h>
38 #include <linux/skbuff.h>
39 #include <asm/uaccess.h>
41 #include <net/ndisc.h>
42 #include <net/protocol.h>
43 #include <net/transp_v6.h>
44 #include <net/ip6_route.h>
46 #include <net/tcp_states.h>
47 #include <net/ip6_checksum.h>
50 #include <linux/proc_fs.h>
51 #include <linux/seq_file.h>
54 DEFINE_SNMP_STAT(struct udp_mib
, udp_stats_in6
) __read_mostly
;
55 EXPORT_SYMBOL(udp_stats_in6
);
57 static inline int udp_v6_get_port(struct sock
*sk
, unsigned short snum
)
59 return udp_get_port(sk
, snum
, ipv6_rcv_saddr_equal
);
62 static struct sock
*__udp6_lib_lookup(struct in6_addr
*saddr
, __be16 sport
,
63 struct in6_addr
*daddr
, __be16 dport
,
64 int dif
, struct hlist_head udptable
[])
66 struct sock
*sk
, *result
= NULL
;
67 struct hlist_node
*node
;
68 unsigned short hnum
= ntohs(dport
);
71 read_lock(&udp_hash_lock
);
72 sk_for_each(sk
, node
, &udptable
[hnum
& (UDP_HTABLE_SIZE
- 1)]) {
73 struct inet_sock
*inet
= inet_sk(sk
);
75 if (sk
->sk_hash
== hnum
&& sk
->sk_family
== PF_INET6
) {
76 struct ipv6_pinfo
*np
= inet6_sk(sk
);
79 if (inet
->dport
!= sport
)
83 if (!ipv6_addr_any(&np
->rcv_saddr
)) {
84 if (!ipv6_addr_equal(&np
->rcv_saddr
, daddr
))
88 if (!ipv6_addr_any(&np
->daddr
)) {
89 if (!ipv6_addr_equal(&np
->daddr
, saddr
))
93 if (sk
->sk_bound_dev_if
) {
94 if (sk
->sk_bound_dev_if
!= dif
)
101 } else if (score
> badness
) {
109 read_unlock(&udp_hash_lock
);
114 * This should be easy, if there is something there we
115 * return it, otherwise we block.
118 int udpv6_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
119 struct msghdr
*msg
, size_t len
,
120 int noblock
, int flags
, int *addr_len
)
122 struct ipv6_pinfo
*np
= inet6_sk(sk
);
123 struct inet_sock
*inet
= inet_sk(sk
);
125 unsigned int ulen
, copied
;
128 int is_udplite
= IS_UDPLITE(sk
);
131 *addr_len
=sizeof(struct sockaddr_in6
);
133 if (flags
& MSG_ERRQUEUE
)
134 return ipv6_recv_error(sk
, msg
, len
);
137 skb
= __skb_recv_datagram(sk
, flags
| (noblock
? MSG_DONTWAIT
: 0),
142 ulen
= skb
->len
- sizeof(struct udphdr
);
146 else if (copied
< ulen
)
147 msg
->msg_flags
|= MSG_TRUNC
;
150 * If checksum is needed at all, try to do it while copying the
151 * data. If the data is truncated, or if we only want a partial
152 * coverage checksum (UDP-Lite), do it before the copy.
155 if (copied
< ulen
|| UDP_SKB_CB(skb
)->partial_cov
) {
156 if (udp_lib_checksum_complete(skb
))
160 if (skb_csum_unnecessary(skb
))
161 err
= skb_copy_datagram_iovec(skb
, sizeof(struct udphdr
),
162 msg
->msg_iov
, copied
);
164 err
= skb_copy_and_csum_datagram_iovec(skb
, sizeof(struct udphdr
), msg
->msg_iov
);
172 UDP6_INC_STATS_USER(UDP_MIB_INDATAGRAMS
, is_udplite
);
174 sock_recv_timestamp(msg
, sk
, skb
);
176 /* Copy the address. */
178 struct sockaddr_in6
*sin6
;
180 sin6
= (struct sockaddr_in6
*) msg
->msg_name
;
181 sin6
->sin6_family
= AF_INET6
;
182 sin6
->sin6_port
= udp_hdr(skb
)->source
;
183 sin6
->sin6_flowinfo
= 0;
184 sin6
->sin6_scope_id
= 0;
186 if (skb
->protocol
== htons(ETH_P_IP
))
187 ipv6_addr_set(&sin6
->sin6_addr
, 0, 0,
188 htonl(0xffff), ip_hdr(skb
)->saddr
);
190 ipv6_addr_copy(&sin6
->sin6_addr
,
191 &ipv6_hdr(skb
)->saddr
);
192 if (ipv6_addr_type(&sin6
->sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
193 sin6
->sin6_scope_id
= IP6CB(skb
)->iif
;
197 if (skb
->protocol
== htons(ETH_P_IP
)) {
198 if (inet
->cmsg_flags
)
199 ip_cmsg_recv(msg
, skb
);
202 datagram_recv_ctl(sk
, msg
, skb
);
206 if (flags
& MSG_TRUNC
)
210 skb_free_datagram(sk
, skb
);
215 if (!skb_kill_datagram(sk
, skb
, flags
))
216 UDP6_INC_STATS_USER(UDP_MIB_INERRORS
, is_udplite
);
218 if (flags
& MSG_DONTWAIT
)
223 void __udp6_lib_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
224 int type
, int code
, int offset
, __be32 info
,
225 struct hlist_head udptable
[] )
227 struct ipv6_pinfo
*np
;
228 struct ipv6hdr
*hdr
= (struct ipv6hdr
*)skb
->data
;
229 struct in6_addr
*saddr
= &hdr
->saddr
;
230 struct in6_addr
*daddr
= &hdr
->daddr
;
231 struct udphdr
*uh
= (struct udphdr
*)(skb
->data
+offset
);
235 sk
= __udp6_lib_lookup(daddr
, uh
->dest
,
236 saddr
, uh
->source
, inet6_iif(skb
), udptable
);
242 if (!icmpv6_err_convert(type
, code
, &err
) && !np
->recverr
)
245 if (sk
->sk_state
!= TCP_ESTABLISHED
&& !np
->recverr
)
249 ipv6_icmp_error(sk
, skb
, err
, uh
->dest
, ntohl(info
), (u8
*)(uh
+1));
252 sk
->sk_error_report(sk
);
257 static __inline__
void udpv6_err(struct sk_buff
*skb
,
258 struct inet6_skb_parm
*opt
, int type
,
259 int code
, int offset
, __be32 info
)
261 return __udp6_lib_err(skb
, opt
, type
, code
, offset
, info
, udp_hash
);
264 int udpv6_queue_rcv_skb(struct sock
* sk
, struct sk_buff
*skb
)
266 struct udp_sock
*up
= udp_sk(sk
);
268 int is_udplite
= IS_UDPLITE(sk
);
270 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
274 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
276 if ((is_udplite
& UDPLITE_RECV_CC
) && UDP_SKB_CB(skb
)->partial_cov
) {
278 if (up
->pcrlen
== 0) { /* full coverage was set */
279 LIMIT_NETDEBUG(KERN_WARNING
"UDPLITE6: partial coverage"
280 " %d while full coverage %d requested\n",
281 UDP_SKB_CB(skb
)->cscov
, skb
->len
);
284 if (UDP_SKB_CB(skb
)->cscov
< up
->pcrlen
) {
285 LIMIT_NETDEBUG(KERN_WARNING
"UDPLITE6: coverage %d "
286 "too small, need min %d\n",
287 UDP_SKB_CB(skb
)->cscov
, up
->pcrlen
);
293 if (udp_lib_checksum_complete(skb
))
297 if ((rc
= sock_queue_rcv_skb(sk
,skb
)) < 0) {
298 /* Note that an ENOMEM error is charged twice */
300 UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS
, is_udplite
);
306 UDP6_INC_STATS_BH(UDP_MIB_INERRORS
, is_udplite
);
311 static struct sock
*udp_v6_mcast_next(struct sock
*sk
,
312 __be16 loc_port
, struct in6_addr
*loc_addr
,
313 __be16 rmt_port
, struct in6_addr
*rmt_addr
,
316 struct hlist_node
*node
;
318 unsigned short num
= ntohs(loc_port
);
320 sk_for_each_from(s
, node
) {
321 struct inet_sock
*inet
= inet_sk(s
);
323 if (s
->sk_hash
== num
&& s
->sk_family
== PF_INET6
) {
324 struct ipv6_pinfo
*np
= inet6_sk(s
);
326 if (inet
->dport
!= rmt_port
)
329 if (!ipv6_addr_any(&np
->daddr
) &&
330 !ipv6_addr_equal(&np
->daddr
, rmt_addr
))
333 if (s
->sk_bound_dev_if
&& s
->sk_bound_dev_if
!= dif
)
336 if (!ipv6_addr_any(&np
->rcv_saddr
)) {
337 if (!ipv6_addr_equal(&np
->rcv_saddr
, loc_addr
))
340 if (!inet6_mc_check(s
, loc_addr
, rmt_addr
))
349 * Note: called only from the BH handler context,
350 * so we don't need to lock the hashes.
352 static int __udp6_lib_mcast_deliver(struct sk_buff
*skb
, struct in6_addr
*saddr
,
353 struct in6_addr
*daddr
, struct hlist_head udptable
[])
355 struct sock
*sk
, *sk2
;
356 const struct udphdr
*uh
= udp_hdr(skb
);
359 read_lock(&udp_hash_lock
);
360 sk
= sk_head(&udptable
[ntohs(uh
->dest
) & (UDP_HTABLE_SIZE
- 1)]);
361 dif
= inet6_iif(skb
);
362 sk
= udp_v6_mcast_next(sk
, uh
->dest
, daddr
, uh
->source
, saddr
, dif
);
369 while ((sk2
= udp_v6_mcast_next(sk_next(sk2
), uh
->dest
, daddr
,
370 uh
->source
, saddr
, dif
))) {
371 struct sk_buff
*buff
= skb_clone(skb
, GFP_ATOMIC
);
373 udpv6_queue_rcv_skb(sk2
, buff
);
375 udpv6_queue_rcv_skb(sk
, skb
);
377 read_unlock(&udp_hash_lock
);
381 static inline int udp6_csum_init(struct sk_buff
*skb
, struct udphdr
*uh
,
386 UDP_SKB_CB(skb
)->partial_cov
= 0;
387 UDP_SKB_CB(skb
)->cscov
= skb
->len
;
389 if (proto
== IPPROTO_UDPLITE
) {
390 err
= udplite_checksum_init(skb
, uh
);
395 if (uh
->check
== 0) {
396 /* RFC 2460 section 8.1 says that we SHOULD log
397 this error. Well, it is reasonable.
399 LIMIT_NETDEBUG(KERN_INFO
"IPv6: udp checksum is 0\n");
402 if (skb
->ip_summed
== CHECKSUM_COMPLETE
&&
403 !csum_ipv6_magic(&ipv6_hdr(skb
)->saddr
, &ipv6_hdr(skb
)->daddr
,
404 skb
->len
, proto
, skb
->csum
))
405 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
407 if (!skb_csum_unnecessary(skb
))
408 skb
->csum
= ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb
)->saddr
,
409 &ipv6_hdr(skb
)->daddr
,
410 skb
->len
, proto
, 0));
415 int __udp6_lib_rcv(struct sk_buff
*skb
, struct hlist_head udptable
[],
420 struct net_device
*dev
= skb
->dev
;
421 struct in6_addr
*saddr
, *daddr
;
424 if (!pskb_may_pull(skb
, sizeof(struct udphdr
)))
427 saddr
= &ipv6_hdr(skb
)->saddr
;
428 daddr
= &ipv6_hdr(skb
)->daddr
;
431 ulen
= ntohs(uh
->len
);
435 if (proto
== IPPROTO_UDP
) {
436 /* UDP validates ulen. */
438 /* Check for jumbo payload */
442 if (ulen
< sizeof(*uh
))
445 if (ulen
< skb
->len
) {
446 if (pskb_trim_rcsum(skb
, ulen
))
448 saddr
= &ipv6_hdr(skb
)->saddr
;
449 daddr
= &ipv6_hdr(skb
)->daddr
;
454 if (udp6_csum_init(skb
, uh
, proto
))
458 * Multicast receive code
460 if (ipv6_addr_is_multicast(daddr
))
461 return __udp6_lib_mcast_deliver(skb
, saddr
, daddr
, udptable
);
466 * check socket cache ... must talk to Alan about his plans
467 * for sock caches... i'll skip this for now.
469 sk
= __udp6_lib_lookup(saddr
, uh
->source
,
470 daddr
, uh
->dest
, inet6_iif(skb
), udptable
);
473 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
476 if (udp_lib_checksum_complete(skb
))
478 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS
, proto
== IPPROTO_UDPLITE
);
480 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_PORT_UNREACH
, 0, dev
);
488 udpv6_queue_rcv_skb(sk
, skb
);
493 LIMIT_NETDEBUG(KERN_DEBUG
"UDP%sv6: short packet: %d/%u\n",
494 proto
== IPPROTO_UDPLITE
? "-Lite" : "",
498 UDP6_INC_STATS_BH(UDP_MIB_INERRORS
, proto
== IPPROTO_UDPLITE
);
503 static __inline__
int udpv6_rcv(struct sk_buff
*skb
)
505 return __udp6_lib_rcv(skb
, udp_hash
, IPPROTO_UDP
);
509 * Throw away all pending data and cancel the corking. Socket is locked.
511 static void udp_v6_flush_pending_frames(struct sock
*sk
)
513 struct udp_sock
*up
= udp_sk(sk
);
518 ip6_flush_pending_frames(sk
);
526 static int udp_v6_push_pending_frames(struct sock
*sk
)
530 struct udp_sock
*up
= udp_sk(sk
);
531 struct inet_sock
*inet
= inet_sk(sk
);
532 struct flowi
*fl
= &inet
->cork
.fl
;
534 int is_udplite
= IS_UDPLITE(sk
);
537 /* Grab the skbuff where UDP header space exists. */
538 if ((skb
= skb_peek(&sk
->sk_write_queue
)) == NULL
)
542 * Create a UDP header
545 uh
->source
= fl
->fl_ip_sport
;
546 uh
->dest
= fl
->fl_ip_dport
;
547 uh
->len
= htons(up
->len
);
551 csum
= udplite_csum_outgoing(sk
, skb
);
553 csum
= udp_csum_outgoing(sk
, skb
);
555 /* add protocol-dependent pseudo-header */
556 uh
->check
= csum_ipv6_magic(&fl
->fl6_src
, &fl
->fl6_dst
,
557 up
->len
, fl
->proto
, csum
);
559 uh
->check
= CSUM_MANGLED_0
;
561 err
= ip6_push_pending_frames(sk
);
566 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS
, is_udplite
);
570 int udpv6_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
571 struct msghdr
*msg
, size_t len
)
573 struct ipv6_txoptions opt_space
;
574 struct udp_sock
*up
= udp_sk(sk
);
575 struct inet_sock
*inet
= inet_sk(sk
);
576 struct ipv6_pinfo
*np
= inet6_sk(sk
);
577 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*) msg
->msg_name
;
578 struct in6_addr
*daddr
, *final_p
= NULL
, final
;
579 struct ipv6_txoptions
*opt
= NULL
;
580 struct ip6_flowlabel
*flowlabel
= NULL
;
582 struct dst_entry
*dst
;
583 int addr_len
= msg
->msg_namelen
;
587 int corkreq
= up
->corkflag
|| msg
->msg_flags
&MSG_MORE
;
590 int is_udplite
= IS_UDPLITE(sk
);
591 int (*getfrag
)(void *, char *, int, int, int, struct sk_buff
*);
593 /* destination address check */
595 if (addr_len
< offsetof(struct sockaddr
, sa_data
))
598 switch (sin6
->sin6_family
) {
600 if (addr_len
< SIN6_LEN_RFC2133
)
602 daddr
= &sin6
->sin6_addr
;
607 msg
->msg_name
= sin6
= NULL
;
608 msg
->msg_namelen
= addr_len
= 0;
614 } else if (!up
->pending
) {
615 if (sk
->sk_state
!= TCP_ESTABLISHED
)
616 return -EDESTADDRREQ
;
622 if (ipv6_addr_v4mapped(daddr
)) {
623 struct sockaddr_in sin
;
624 sin
.sin_family
= AF_INET
;
625 sin
.sin_port
= sin6
? sin6
->sin6_port
: inet
->dport
;
626 sin
.sin_addr
.s_addr
= daddr
->s6_addr32
[3];
627 msg
->msg_name
= &sin
;
628 msg
->msg_namelen
= sizeof(sin
);
630 if (__ipv6_only_sock(sk
))
632 return udp_sendmsg(iocb
, sk
, msg
, len
);
636 if (up
->pending
== AF_INET
)
637 return udp_sendmsg(iocb
, sk
, msg
, len
);
639 /* Rough check on arithmetic overflow,
640 better check is made in ip6_append_data().
642 if (len
> INT_MAX
- sizeof(struct udphdr
))
647 * There are pending frames.
648 * The socket lock must be held while it's corked.
651 if (likely(up
->pending
)) {
652 if (unlikely(up
->pending
!= AF_INET6
)) {
654 return -EAFNOSUPPORT
;
661 ulen
+= sizeof(struct udphdr
);
663 memset(&fl
, 0, sizeof(fl
));
666 if (sin6
->sin6_port
== 0)
669 fl
.fl_ip_dport
= sin6
->sin6_port
;
670 daddr
= &sin6
->sin6_addr
;
673 fl
.fl6_flowlabel
= sin6
->sin6_flowinfo
&IPV6_FLOWINFO_MASK
;
674 if (fl
.fl6_flowlabel
&IPV6_FLOWLABEL_MASK
) {
675 flowlabel
= fl6_sock_lookup(sk
, fl
.fl6_flowlabel
);
676 if (flowlabel
== NULL
)
678 daddr
= &flowlabel
->dst
;
683 * Otherwise it will be difficult to maintain
686 if (sk
->sk_state
== TCP_ESTABLISHED
&&
687 ipv6_addr_equal(daddr
, &np
->daddr
))
690 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
691 sin6
->sin6_scope_id
&&
692 ipv6_addr_type(daddr
)&IPV6_ADDR_LINKLOCAL
)
693 fl
.oif
= sin6
->sin6_scope_id
;
695 if (sk
->sk_state
!= TCP_ESTABLISHED
)
696 return -EDESTADDRREQ
;
698 fl
.fl_ip_dport
= inet
->dport
;
700 fl
.fl6_flowlabel
= np
->flow_label
;
705 fl
.oif
= sk
->sk_bound_dev_if
;
707 if (msg
->msg_controllen
) {
709 memset(opt
, 0, sizeof(struct ipv6_txoptions
));
710 opt
->tot_len
= sizeof(*opt
);
712 err
= datagram_send_ctl(msg
, &fl
, opt
, &hlimit
, &tclass
);
714 fl6_sock_release(flowlabel
);
717 if ((fl
.fl6_flowlabel
&IPV6_FLOWLABEL_MASK
) && !flowlabel
) {
718 flowlabel
= fl6_sock_lookup(sk
, fl
.fl6_flowlabel
);
719 if (flowlabel
== NULL
)
722 if (!(opt
->opt_nflen
|opt
->opt_flen
))
729 opt
= fl6_merge_options(&opt_space
, flowlabel
, opt
);
730 opt
= ipv6_fixup_options(&opt_space
, opt
);
732 fl
.proto
= sk
->sk_protocol
;
733 ipv6_addr_copy(&fl
.fl6_dst
, daddr
);
734 if (ipv6_addr_any(&fl
.fl6_src
) && !ipv6_addr_any(&np
->saddr
))
735 ipv6_addr_copy(&fl
.fl6_src
, &np
->saddr
);
736 fl
.fl_ip_sport
= inet
->sport
;
738 /* merge ip6_build_xmit from ip6_output */
739 if (opt
&& opt
->srcrt
) {
740 struct rt0_hdr
*rt0
= (struct rt0_hdr
*) opt
->srcrt
;
741 ipv6_addr_copy(&final
, &fl
.fl6_dst
);
742 ipv6_addr_copy(&fl
.fl6_dst
, rt0
->addr
);
747 if (!fl
.oif
&& ipv6_addr_is_multicast(&fl
.fl6_dst
)) {
748 fl
.oif
= np
->mcast_oif
;
752 security_sk_classify_flow(sk
, &fl
);
754 err
= ip6_sk_dst_lookup(sk
, &dst
, &fl
);
758 ipv6_addr_copy(&fl
.fl6_dst
, final_p
);
760 if ((err
= __xfrm_lookup(&dst
, &fl
, sk
, 1)) < 0) {
762 err
= ip6_dst_blackhole(sk
, &dst
, &fl
);
768 if (ipv6_addr_is_multicast(&fl
.fl6_dst
))
769 hlimit
= np
->mcast_hops
;
771 hlimit
= np
->hop_limit
;
773 hlimit
= dst_metric(dst
, RTAX_HOPLIMIT
);
775 hlimit
= ipv6_get_hoplimit(dst
->dev
);
784 if (msg
->msg_flags
&MSG_CONFIRM
)
789 if (unlikely(up
->pending
)) {
790 /* The socket is already corked while preparing it. */
791 /* ... which is an evident application bug. --ANK */
794 LIMIT_NETDEBUG(KERN_DEBUG
"udp cork app bug 2\n");
799 up
->pending
= AF_INET6
;
803 getfrag
= is_udplite
? udplite_getfrag
: ip_generic_getfrag
;
804 err
= ip6_append_data(sk
, getfrag
, msg
->msg_iov
, ulen
,
805 sizeof(struct udphdr
), hlimit
, tclass
, opt
, &fl
,
806 (struct rt6_info
*)dst
,
807 corkreq
? msg
->msg_flags
|MSG_MORE
: msg
->msg_flags
);
809 udp_v6_flush_pending_frames(sk
);
811 err
= udp_v6_push_pending_frames(sk
);
812 else if (unlikely(skb_queue_empty(&sk
->sk_write_queue
)))
817 ip6_dst_store(sk
, dst
,
818 ipv6_addr_equal(&fl
.fl6_dst
, &np
->daddr
) ?
820 #ifdef CONFIG_IPV6_SUBTREES
821 ipv6_addr_equal(&fl
.fl6_src
, &np
->saddr
) ?
831 err
= np
->recverr
? net_xmit_errno(err
) : 0;
834 fl6_sock_release(flowlabel
);
838 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
839 * ENOBUFS might not be good (it's not tunable per se), but otherwise
840 * we don't have a good statistic (IpOutDiscards but it can be too many
841 * things). We could add another new stat but at least for now that
842 * seems like overkill.
844 if (err
== -ENOBUFS
|| test_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
)) {
845 UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS
, is_udplite
);
851 if (!(msg
->msg_flags
&MSG_PROBE
) || len
)
852 goto back_from_confirm
;
857 int udpv6_destroy_sock(struct sock
*sk
)
860 udp_v6_flush_pending_frames(sk
);
863 inet6_destroy_sock(sk
);
869 * Socket option code for UDP
871 int udpv6_setsockopt(struct sock
*sk
, int level
, int optname
,
872 char __user
*optval
, int optlen
)
874 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
875 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
876 udp_v6_push_pending_frames
);
877 return ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
881 int compat_udpv6_setsockopt(struct sock
*sk
, int level
, int optname
,
882 char __user
*optval
, int optlen
)
884 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
885 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
886 udp_v6_push_pending_frames
);
887 return compat_ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
891 int udpv6_getsockopt(struct sock
*sk
, int level
, int optname
,
892 char __user
*optval
, int __user
*optlen
)
894 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
895 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
896 return ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
900 int compat_udpv6_getsockopt(struct sock
*sk
, int level
, int optname
,
901 char __user
*optval
, int __user
*optlen
)
903 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
904 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
905 return compat_ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
909 static struct inet6_protocol udpv6_protocol
= {
910 .handler
= udpv6_rcv
,
911 .err_handler
= udpv6_err
,
912 .flags
= INET6_PROTO_NOPOLICY
|INET6_PROTO_FINAL
,
915 /* ------------------------------------------------------------------------ */
916 #ifdef CONFIG_PROC_FS
918 static void udp6_sock_seq_show(struct seq_file
*seq
, struct sock
*sp
, int bucket
)
920 struct inet_sock
*inet
= inet_sk(sp
);
921 struct ipv6_pinfo
*np
= inet6_sk(sp
);
922 struct in6_addr
*dest
, *src
;
926 src
= &np
->rcv_saddr
;
927 destp
= ntohs(inet
->dport
);
928 srcp
= ntohs(inet
->sport
);
930 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
931 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
933 src
->s6_addr32
[0], src
->s6_addr32
[1],
934 src
->s6_addr32
[2], src
->s6_addr32
[3], srcp
,
935 dest
->s6_addr32
[0], dest
->s6_addr32
[1],
936 dest
->s6_addr32
[2], dest
->s6_addr32
[3], destp
,
938 atomic_read(&sp
->sk_wmem_alloc
),
939 atomic_read(&sp
->sk_rmem_alloc
),
943 atomic_read(&sp
->sk_refcnt
), sp
);
946 int udp6_seq_show(struct seq_file
*seq
, void *v
)
948 if (v
== SEQ_START_TOKEN
)
953 "st tx_queue rx_queue tr tm->when retrnsmt"
954 " uid timeout inode\n");
956 udp6_sock_seq_show(seq
, v
, ((struct udp_iter_state
*)seq
->private)->bucket
);
960 static struct file_operations udp6_seq_fops
;
961 static struct udp_seq_afinfo udp6_seq_afinfo
= {
962 .owner
= THIS_MODULE
,
965 .hashtable
= udp_hash
,
966 .seq_show
= udp6_seq_show
,
967 .seq_fops
= &udp6_seq_fops
,
970 int __init
udp6_proc_init(void)
972 return udp_proc_register(&udp6_seq_afinfo
);
975 void udp6_proc_exit(void) {
976 udp_proc_unregister(&udp6_seq_afinfo
);
978 #endif /* CONFIG_PROC_FS */
980 /* ------------------------------------------------------------------------ */
982 DEFINE_PROTO_INUSE(udpv6
)
984 struct proto udpv6_prot
= {
986 .owner
= THIS_MODULE
,
987 .close
= udp_lib_close
,
988 .connect
= ip6_datagram_connect
,
989 .disconnect
= udp_disconnect
,
991 .destroy
= udpv6_destroy_sock
,
992 .setsockopt
= udpv6_setsockopt
,
993 .getsockopt
= udpv6_getsockopt
,
994 .sendmsg
= udpv6_sendmsg
,
995 .recvmsg
= udpv6_recvmsg
,
996 .backlog_rcv
= udpv6_queue_rcv_skb
,
997 .hash
= udp_lib_hash
,
998 .unhash
= udp_lib_unhash
,
999 .get_port
= udp_v6_get_port
,
1000 .obj_size
= sizeof(struct udp6_sock
),
1001 #ifdef CONFIG_COMPAT
1002 .compat_setsockopt
= compat_udpv6_setsockopt
,
1003 .compat_getsockopt
= compat_udpv6_getsockopt
,
1005 REF_PROTO_INUSE(udpv6
)
1008 static struct inet_protosw udpv6_protosw
= {
1010 .protocol
= IPPROTO_UDP
,
1011 .prot
= &udpv6_prot
,
1012 .ops
= &inet6_dgram_ops
,
1014 .no_check
= UDP_CSUM_DEFAULT
,
1015 .flags
= INET_PROTOSW_PERMANENT
,
1019 int __init
udpv6_init(void)
1023 ret
= inet6_add_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1027 ret
= inet6_register_protosw(&udpv6_protosw
);
1029 goto out_udpv6_protocol
;
1034 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1038 void __exit
udpv6_exit(void)
1040 inet6_unregister_protosw(&udpv6_protosw
);
1041 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);