3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * Based on linux/ipv4/udp.c
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
14 * a single port at the same time.
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/in6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/ipv6.h>
33 #include <linux/icmpv6.h>
34 #include <linux/init.h>
35 #include <linux/module.h>
36 #include <linux/skbuff.h>
37 #include <asm/uaccess.h>
39 #include <net/ndisc.h>
40 #include <net/protocol.h>
41 #include <net/transp_v6.h>
42 #include <net/ip6_route.h>
44 #include <net/tcp_states.h>
45 #include <net/ip6_checksum.h>
48 #include <linux/proc_fs.h>
49 #include <linux/seq_file.h>
52 int ipv6_rcv_saddr_equal(const struct sock
*sk
, const struct sock
*sk2
)
54 const struct in6_addr
*sk_rcv_saddr6
= &inet6_sk(sk
)->rcv_saddr
;
55 const struct in6_addr
*sk2_rcv_saddr6
= inet6_rcv_saddr(sk2
);
56 __be32 sk_rcv_saddr
= inet_sk(sk
)->rcv_saddr
;
57 __be32 sk2_rcv_saddr
= inet_rcv_saddr(sk2
);
58 int sk_ipv6only
= ipv6_only_sock(sk
);
59 int sk2_ipv6only
= inet_v6_ipv6only(sk2
);
60 int addr_type
= ipv6_addr_type(sk_rcv_saddr6
);
61 int addr_type2
= sk2_rcv_saddr6
? ipv6_addr_type(sk2_rcv_saddr6
) : IPV6_ADDR_MAPPED
;
63 /* if both are mapped, treat as IPv4 */
64 if (addr_type
== IPV6_ADDR_MAPPED
&& addr_type2
== IPV6_ADDR_MAPPED
)
65 return (!sk2_ipv6only
&&
66 (!sk_rcv_saddr
|| !sk2_rcv_saddr
||
67 sk_rcv_saddr
== sk2_rcv_saddr
));
69 if (addr_type2
== IPV6_ADDR_ANY
&&
70 !(sk2_ipv6only
&& addr_type
== IPV6_ADDR_MAPPED
))
73 if (addr_type
== IPV6_ADDR_ANY
&&
74 !(sk_ipv6only
&& addr_type2
== IPV6_ADDR_MAPPED
))
78 ipv6_addr_equal(sk_rcv_saddr6
, sk2_rcv_saddr6
))
84 int udp_v6_get_port(struct sock
*sk
, unsigned short snum
)
86 return udp_lib_get_port(sk
, snum
, ipv6_rcv_saddr_equal
);
89 static inline int compute_score(struct sock
*sk
, struct net
*net
,
91 struct in6_addr
*saddr
, __be16 sport
,
92 struct in6_addr
*daddr
, __be16 dport
,
97 if (net_eq(sock_net(sk
), net
) && sk
->sk_hash
== hnum
&&
98 sk
->sk_family
== PF_INET6
) {
99 struct ipv6_pinfo
*np
= inet6_sk(sk
);
100 struct inet_sock
*inet
= inet_sk(sk
);
104 if (inet
->dport
!= sport
)
108 if (!ipv6_addr_any(&np
->rcv_saddr
)) {
109 if (!ipv6_addr_equal(&np
->rcv_saddr
, daddr
))
113 if (!ipv6_addr_any(&np
->daddr
)) {
114 if (!ipv6_addr_equal(&np
->daddr
, saddr
))
118 if (sk
->sk_bound_dev_if
) {
119 if (sk
->sk_bound_dev_if
!= dif
)
127 static struct sock
*__udp6_lib_lookup(struct net
*net
,
128 struct in6_addr
*saddr
, __be16 sport
,
129 struct in6_addr
*daddr
, __be16 dport
,
130 int dif
, struct udp_table
*udptable
)
132 struct sock
*sk
, *result
;
133 struct hlist_nulls_node
*node
;
134 unsigned short hnum
= ntohs(dport
);
135 unsigned int hash
= udp_hashfn(net
, hnum
);
136 struct udp_hslot
*hslot
= &udptable
->hash
[hash
];
143 sk_nulls_for_each_rcu(sk
, node
, &hslot
->head
) {
144 score
= compute_score(sk
, net
, hnum
, saddr
, sport
, daddr
, dport
, dif
);
145 if (score
> badness
) {
151 * if the nulls value we got at the end of this lookup is
152 * not the expected one, we must restart lookup.
153 * We probably met an item that was moved to another chain.
155 if (get_nulls_value(node
) != hash
)
159 if (unlikely(!atomic_inc_not_zero(&result
->sk_refcnt
)))
161 else if (unlikely(compute_score(result
, net
, hnum
, saddr
, sport
,
162 daddr
, dport
, dif
) < badness
)) {
171 static struct sock
*__udp6_lib_lookup_skb(struct sk_buff
*skb
,
172 __be16 sport
, __be16 dport
,
173 struct udp_table
*udptable
)
176 struct ipv6hdr
*iph
= ipv6_hdr(skb
);
178 if (unlikely(sk
= skb_steal_sock(skb
)))
180 return __udp6_lib_lookup(dev_net(skb_dst(skb
)->dev
), &iph
->saddr
, sport
,
181 &iph
->daddr
, dport
, inet6_iif(skb
),
186 * This should be easy, if there is something there we
187 * return it, otherwise we block.
190 int udpv6_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
191 struct msghdr
*msg
, size_t len
,
192 int noblock
, int flags
, int *addr_len
)
194 struct ipv6_pinfo
*np
= inet6_sk(sk
);
195 struct inet_sock
*inet
= inet_sk(sk
);
197 unsigned int ulen
, copied
;
200 int is_udplite
= IS_UDPLITE(sk
);
204 *addr_len
=sizeof(struct sockaddr_in6
);
206 if (flags
& MSG_ERRQUEUE
)
207 return ipv6_recv_error(sk
, msg
, len
);
210 skb
= __skb_recv_datagram(sk
, flags
| (noblock
? MSG_DONTWAIT
: 0),
215 ulen
= skb
->len
- sizeof(struct udphdr
);
219 else if (copied
< ulen
)
220 msg
->msg_flags
|= MSG_TRUNC
;
222 is_udp4
= (skb
->protocol
== htons(ETH_P_IP
));
225 * If checksum is needed at all, try to do it while copying the
226 * data. If the data is truncated, or if we only want a partial
227 * coverage checksum (UDP-Lite), do it before the copy.
230 if (copied
< ulen
|| UDP_SKB_CB(skb
)->partial_cov
) {
231 if (udp_lib_checksum_complete(skb
))
235 if (skb_csum_unnecessary(skb
))
236 err
= skb_copy_datagram_iovec(skb
, sizeof(struct udphdr
),
237 msg
->msg_iov
, copied
);
239 err
= skb_copy_and_csum_datagram_iovec(skb
, sizeof(struct udphdr
), msg
->msg_iov
);
248 UDP_INC_STATS_USER(sock_net(sk
),
249 UDP_MIB_INDATAGRAMS
, is_udplite
);
251 UDP6_INC_STATS_USER(sock_net(sk
),
252 UDP_MIB_INDATAGRAMS
, is_udplite
);
255 sock_recv_timestamp(msg
, sk
, skb
);
257 /* Copy the address. */
259 struct sockaddr_in6
*sin6
;
261 sin6
= (struct sockaddr_in6
*) msg
->msg_name
;
262 sin6
->sin6_family
= AF_INET6
;
263 sin6
->sin6_port
= udp_hdr(skb
)->source
;
264 sin6
->sin6_flowinfo
= 0;
265 sin6
->sin6_scope_id
= 0;
268 ipv6_addr_set(&sin6
->sin6_addr
, 0, 0,
269 htonl(0xffff), ip_hdr(skb
)->saddr
);
271 ipv6_addr_copy(&sin6
->sin6_addr
,
272 &ipv6_hdr(skb
)->saddr
);
273 if (ipv6_addr_type(&sin6
->sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
274 sin6
->sin6_scope_id
= IP6CB(skb
)->iif
;
279 if (inet
->cmsg_flags
)
280 ip_cmsg_recv(msg
, skb
);
283 datagram_recv_ctl(sk
, msg
, skb
);
287 if (flags
& MSG_TRUNC
)
291 skb_free_datagram_locked(sk
, skb
);
297 if (!skb_kill_datagram(sk
, skb
, flags
)) {
299 UDP_INC_STATS_USER(sock_net(sk
),
300 UDP_MIB_INERRORS
, is_udplite
);
302 UDP6_INC_STATS_USER(sock_net(sk
),
303 UDP_MIB_INERRORS
, is_udplite
);
307 if (flags
& MSG_DONTWAIT
)
312 void __udp6_lib_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
313 u8 type
, u8 code
, int offset
, __be32 info
,
314 struct udp_table
*udptable
)
316 struct ipv6_pinfo
*np
;
317 struct ipv6hdr
*hdr
= (struct ipv6hdr
*)skb
->data
;
318 struct in6_addr
*saddr
= &hdr
->saddr
;
319 struct in6_addr
*daddr
= &hdr
->daddr
;
320 struct udphdr
*uh
= (struct udphdr
*)(skb
->data
+offset
);
324 sk
= __udp6_lib_lookup(dev_net(skb
->dev
), daddr
, uh
->dest
,
325 saddr
, uh
->source
, inet6_iif(skb
), udptable
);
331 if (!icmpv6_err_convert(type
, code
, &err
) && !np
->recverr
)
334 if (sk
->sk_state
!= TCP_ESTABLISHED
&& !np
->recverr
)
338 ipv6_icmp_error(sk
, skb
, err
, uh
->dest
, ntohl(info
), (u8
*)(uh
+1));
341 sk
->sk_error_report(sk
);
346 static __inline__
void udpv6_err(struct sk_buff
*skb
,
347 struct inet6_skb_parm
*opt
, u8 type
,
348 u8 code
, int offset
, __be32 info
)
350 __udp6_lib_err(skb
, opt
, type
, code
, offset
, info
, &udp_table
);
353 int udpv6_queue_rcv_skb(struct sock
* sk
, struct sk_buff
*skb
)
355 struct udp_sock
*up
= udp_sk(sk
);
357 int is_udplite
= IS_UDPLITE(sk
);
359 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
363 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
365 if ((is_udplite
& UDPLITE_RECV_CC
) && UDP_SKB_CB(skb
)->partial_cov
) {
367 if (up
->pcrlen
== 0) { /* full coverage was set */
368 LIMIT_NETDEBUG(KERN_WARNING
"UDPLITE6: partial coverage"
369 " %d while full coverage %d requested\n",
370 UDP_SKB_CB(skb
)->cscov
, skb
->len
);
373 if (UDP_SKB_CB(skb
)->cscov
< up
->pcrlen
) {
374 LIMIT_NETDEBUG(KERN_WARNING
"UDPLITE6: coverage %d "
375 "too small, need min %d\n",
376 UDP_SKB_CB(skb
)->cscov
, up
->pcrlen
);
382 if (udp_lib_checksum_complete(skb
))
386 if ((rc
= sock_queue_rcv_skb(sk
,skb
)) < 0) {
387 /* Note that an ENOMEM error is charged twice */
389 UDP6_INC_STATS_BH(sock_net(sk
),
390 UDP_MIB_RCVBUFERRORS
, is_udplite
);
391 atomic_inc(&sk
->sk_drops
);
398 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
403 static struct sock
*udp_v6_mcast_next(struct net
*net
, struct sock
*sk
,
404 __be16 loc_port
, struct in6_addr
*loc_addr
,
405 __be16 rmt_port
, struct in6_addr
*rmt_addr
,
408 struct hlist_nulls_node
*node
;
410 unsigned short num
= ntohs(loc_port
);
412 sk_nulls_for_each_from(s
, node
) {
413 struct inet_sock
*inet
= inet_sk(s
);
415 if (!net_eq(sock_net(s
), net
))
418 if (s
->sk_hash
== num
&& s
->sk_family
== PF_INET6
) {
419 struct ipv6_pinfo
*np
= inet6_sk(s
);
421 if (inet
->dport
!= rmt_port
)
424 if (!ipv6_addr_any(&np
->daddr
) &&
425 !ipv6_addr_equal(&np
->daddr
, rmt_addr
))
428 if (s
->sk_bound_dev_if
&& s
->sk_bound_dev_if
!= dif
)
431 if (!ipv6_addr_any(&np
->rcv_saddr
)) {
432 if (!ipv6_addr_equal(&np
->rcv_saddr
, loc_addr
))
435 if (!inet6_mc_check(s
, loc_addr
, rmt_addr
))
444 * Note: called only from the BH handler context,
445 * so we don't need to lock the hashes.
447 static int __udp6_lib_mcast_deliver(struct net
*net
, struct sk_buff
*skb
,
448 struct in6_addr
*saddr
, struct in6_addr
*daddr
,
449 struct udp_table
*udptable
)
451 struct sock
*sk
, *sk2
;
452 const struct udphdr
*uh
= udp_hdr(skb
);
453 struct udp_hslot
*hslot
= &udptable
->hash
[udp_hashfn(net
, ntohs(uh
->dest
))];
456 spin_lock(&hslot
->lock
);
457 sk
= sk_nulls_head(&hslot
->head
);
458 dif
= inet6_iif(skb
);
459 sk
= udp_v6_mcast_next(net
, sk
, uh
->dest
, daddr
, uh
->source
, saddr
, dif
);
466 while ((sk2
= udp_v6_mcast_next(net
, sk_nulls_next(sk2
), uh
->dest
, daddr
,
467 uh
->source
, saddr
, dif
))) {
468 struct sk_buff
*buff
= skb_clone(skb
, GFP_ATOMIC
);
471 if (!sock_owned_by_user(sk2
))
472 udpv6_queue_rcv_skb(sk2
, buff
);
474 sk_add_backlog(sk2
, buff
);
479 if (!sock_owned_by_user(sk
))
480 udpv6_queue_rcv_skb(sk
, skb
);
482 sk_add_backlog(sk
, skb
);
485 spin_unlock(&hslot
->lock
);
489 static inline int udp6_csum_init(struct sk_buff
*skb
, struct udphdr
*uh
,
494 UDP_SKB_CB(skb
)->partial_cov
= 0;
495 UDP_SKB_CB(skb
)->cscov
= skb
->len
;
497 if (proto
== IPPROTO_UDPLITE
) {
498 err
= udplite_checksum_init(skb
, uh
);
503 if (uh
->check
== 0) {
504 /* RFC 2460 section 8.1 says that we SHOULD log
505 this error. Well, it is reasonable.
507 LIMIT_NETDEBUG(KERN_INFO
"IPv6: udp checksum is 0\n");
510 if (skb
->ip_summed
== CHECKSUM_COMPLETE
&&
511 !csum_ipv6_magic(&ipv6_hdr(skb
)->saddr
, &ipv6_hdr(skb
)->daddr
,
512 skb
->len
, proto
, skb
->csum
))
513 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
515 if (!skb_csum_unnecessary(skb
))
516 skb
->csum
= ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb
)->saddr
,
517 &ipv6_hdr(skb
)->daddr
,
518 skb
->len
, proto
, 0));
523 int __udp6_lib_rcv(struct sk_buff
*skb
, struct udp_table
*udptable
,
528 struct net_device
*dev
= skb
->dev
;
529 struct in6_addr
*saddr
, *daddr
;
531 struct net
*net
= dev_net(skb
->dev
);
533 if (!pskb_may_pull(skb
, sizeof(struct udphdr
)))
536 saddr
= &ipv6_hdr(skb
)->saddr
;
537 daddr
= &ipv6_hdr(skb
)->daddr
;
540 ulen
= ntohs(uh
->len
);
544 if (proto
== IPPROTO_UDP
) {
545 /* UDP validates ulen. */
547 /* Check for jumbo payload */
551 if (ulen
< sizeof(*uh
))
554 if (ulen
< skb
->len
) {
555 if (pskb_trim_rcsum(skb
, ulen
))
557 saddr
= &ipv6_hdr(skb
)->saddr
;
558 daddr
= &ipv6_hdr(skb
)->daddr
;
563 if (udp6_csum_init(skb
, uh
, proto
))
567 * Multicast receive code
569 if (ipv6_addr_is_multicast(daddr
))
570 return __udp6_lib_mcast_deliver(net
, skb
,
571 saddr
, daddr
, udptable
);
576 * check socket cache ... must talk to Alan about his plans
577 * for sock caches... i'll skip this for now.
579 sk
= __udp6_lib_lookup_skb(skb
, uh
->source
, uh
->dest
, udptable
);
582 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
585 if (udp_lib_checksum_complete(skb
))
587 UDP6_INC_STATS_BH(net
, UDP_MIB_NOPORTS
,
588 proto
== IPPROTO_UDPLITE
);
590 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_PORT_UNREACH
, 0, dev
);
599 if (!sock_owned_by_user(sk
))
600 udpv6_queue_rcv_skb(sk
, skb
);
602 sk_add_backlog(sk
, skb
);
608 LIMIT_NETDEBUG(KERN_DEBUG
"UDP%sv6: short packet: %d/%u\n",
609 proto
== IPPROTO_UDPLITE
? "-Lite" : "",
613 UDP6_INC_STATS_BH(net
, UDP_MIB_INERRORS
, proto
== IPPROTO_UDPLITE
);
618 static __inline__
int udpv6_rcv(struct sk_buff
*skb
)
620 return __udp6_lib_rcv(skb
, &udp_table
, IPPROTO_UDP
);
624 * Throw away all pending data and cancel the corking. Socket is locked.
626 static void udp_v6_flush_pending_frames(struct sock
*sk
)
628 struct udp_sock
*up
= udp_sk(sk
);
630 if (up
->pending
== AF_INET
)
631 udp_flush_pending_frames(sk
);
632 else if (up
->pending
) {
635 ip6_flush_pending_frames(sk
);
643 static int udp_v6_push_pending_frames(struct sock
*sk
)
647 struct udp_sock
*up
= udp_sk(sk
);
648 struct inet_sock
*inet
= inet_sk(sk
);
649 struct flowi
*fl
= &inet
->cork
.fl
;
651 int is_udplite
= IS_UDPLITE(sk
);
654 /* Grab the skbuff where UDP header space exists. */
655 if ((skb
= skb_peek(&sk
->sk_write_queue
)) == NULL
)
659 * Create a UDP header
662 uh
->source
= fl
->fl_ip_sport
;
663 uh
->dest
= fl
->fl_ip_dport
;
664 uh
->len
= htons(up
->len
);
668 csum
= udplite_csum_outgoing(sk
, skb
);
670 csum
= udp_csum_outgoing(sk
, skb
);
672 /* add protocol-dependent pseudo-header */
673 uh
->check
= csum_ipv6_magic(&fl
->fl6_src
, &fl
->fl6_dst
,
674 up
->len
, fl
->proto
, csum
);
676 uh
->check
= CSUM_MANGLED_0
;
678 err
= ip6_push_pending_frames(sk
);
683 UDP6_INC_STATS_USER(sock_net(sk
),
684 UDP_MIB_OUTDATAGRAMS
, is_udplite
);
688 int udpv6_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
689 struct msghdr
*msg
, size_t len
)
691 struct ipv6_txoptions opt_space
;
692 struct udp_sock
*up
= udp_sk(sk
);
693 struct inet_sock
*inet
= inet_sk(sk
);
694 struct ipv6_pinfo
*np
= inet6_sk(sk
);
695 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*) msg
->msg_name
;
696 struct in6_addr
*daddr
, *final_p
= NULL
, final
;
697 struct ipv6_txoptions
*opt
= NULL
;
698 struct ip6_flowlabel
*flowlabel
= NULL
;
700 struct dst_entry
*dst
;
701 int addr_len
= msg
->msg_namelen
;
705 int corkreq
= up
->corkflag
|| msg
->msg_flags
&MSG_MORE
;
708 int is_udplite
= IS_UDPLITE(sk
);
709 int (*getfrag
)(void *, char *, int, int, int, struct sk_buff
*);
711 /* destination address check */
713 if (addr_len
< offsetof(struct sockaddr
, sa_data
))
716 switch (sin6
->sin6_family
) {
718 if (addr_len
< SIN6_LEN_RFC2133
)
720 daddr
= &sin6
->sin6_addr
;
725 msg
->msg_name
= sin6
= NULL
;
726 msg
->msg_namelen
= addr_len
= 0;
732 } else if (!up
->pending
) {
733 if (sk
->sk_state
!= TCP_ESTABLISHED
)
734 return -EDESTADDRREQ
;
740 if (ipv6_addr_v4mapped(daddr
)) {
741 struct sockaddr_in sin
;
742 sin
.sin_family
= AF_INET
;
743 sin
.sin_port
= sin6
? sin6
->sin6_port
: inet
->dport
;
744 sin
.sin_addr
.s_addr
= daddr
->s6_addr32
[3];
745 msg
->msg_name
= &sin
;
746 msg
->msg_namelen
= sizeof(sin
);
748 if (__ipv6_only_sock(sk
))
750 return udp_sendmsg(iocb
, sk
, msg
, len
);
754 if (up
->pending
== AF_INET
)
755 return udp_sendmsg(iocb
, sk
, msg
, len
);
757 /* Rough check on arithmetic overflow,
758 better check is made in ip6_append_data().
760 if (len
> INT_MAX
- sizeof(struct udphdr
))
765 * There are pending frames.
766 * The socket lock must be held while it's corked.
769 if (likely(up
->pending
)) {
770 if (unlikely(up
->pending
!= AF_INET6
)) {
772 return -EAFNOSUPPORT
;
779 ulen
+= sizeof(struct udphdr
);
781 memset(&fl
, 0, sizeof(fl
));
784 if (sin6
->sin6_port
== 0)
787 fl
.fl_ip_dport
= sin6
->sin6_port
;
788 daddr
= &sin6
->sin6_addr
;
791 fl
.fl6_flowlabel
= sin6
->sin6_flowinfo
&IPV6_FLOWINFO_MASK
;
792 if (fl
.fl6_flowlabel
&IPV6_FLOWLABEL_MASK
) {
793 flowlabel
= fl6_sock_lookup(sk
, fl
.fl6_flowlabel
);
794 if (flowlabel
== NULL
)
796 daddr
= &flowlabel
->dst
;
801 * Otherwise it will be difficult to maintain
804 if (sk
->sk_state
== TCP_ESTABLISHED
&&
805 ipv6_addr_equal(daddr
, &np
->daddr
))
808 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
809 sin6
->sin6_scope_id
&&
810 ipv6_addr_type(daddr
)&IPV6_ADDR_LINKLOCAL
)
811 fl
.oif
= sin6
->sin6_scope_id
;
813 if (sk
->sk_state
!= TCP_ESTABLISHED
)
814 return -EDESTADDRREQ
;
816 fl
.fl_ip_dport
= inet
->dport
;
818 fl
.fl6_flowlabel
= np
->flow_label
;
823 fl
.oif
= sk
->sk_bound_dev_if
;
826 fl
.oif
= np
->sticky_pktinfo
.ipi6_ifindex
;
828 if (msg
->msg_controllen
) {
830 memset(opt
, 0, sizeof(struct ipv6_txoptions
));
831 opt
->tot_len
= sizeof(*opt
);
833 err
= datagram_send_ctl(sock_net(sk
), msg
, &fl
, opt
, &hlimit
, &tclass
);
835 fl6_sock_release(flowlabel
);
838 if ((fl
.fl6_flowlabel
&IPV6_FLOWLABEL_MASK
) && !flowlabel
) {
839 flowlabel
= fl6_sock_lookup(sk
, fl
.fl6_flowlabel
);
840 if (flowlabel
== NULL
)
843 if (!(opt
->opt_nflen
|opt
->opt_flen
))
850 opt
= fl6_merge_options(&opt_space
, flowlabel
, opt
);
851 opt
= ipv6_fixup_options(&opt_space
, opt
);
853 fl
.proto
= sk
->sk_protocol
;
854 if (!ipv6_addr_any(daddr
))
855 ipv6_addr_copy(&fl
.fl6_dst
, daddr
);
857 fl
.fl6_dst
.s6_addr
[15] = 0x1; /* :: means loopback (BSD'ism) */
858 if (ipv6_addr_any(&fl
.fl6_src
) && !ipv6_addr_any(&np
->saddr
))
859 ipv6_addr_copy(&fl
.fl6_src
, &np
->saddr
);
860 fl
.fl_ip_sport
= inet
->sport
;
862 /* merge ip6_build_xmit from ip6_output */
863 if (opt
&& opt
->srcrt
) {
864 struct rt0_hdr
*rt0
= (struct rt0_hdr
*) opt
->srcrt
;
865 ipv6_addr_copy(&final
, &fl
.fl6_dst
);
866 ipv6_addr_copy(&fl
.fl6_dst
, rt0
->addr
);
871 if (!fl
.oif
&& ipv6_addr_is_multicast(&fl
.fl6_dst
)) {
872 fl
.oif
= np
->mcast_oif
;
876 security_sk_classify_flow(sk
, &fl
);
878 err
= ip6_sk_dst_lookup(sk
, &dst
, &fl
);
882 ipv6_addr_copy(&fl
.fl6_dst
, final_p
);
884 err
= __xfrm_lookup(sock_net(sk
), &dst
, &fl
, sk
, XFRM_LOOKUP_WAIT
);
887 err
= ip6_dst_blackhole(sk
, &dst
, &fl
);
893 if (ipv6_addr_is_multicast(&fl
.fl6_dst
))
894 hlimit
= np
->mcast_hops
;
896 hlimit
= np
->hop_limit
;
898 hlimit
= ip6_dst_hoplimit(dst
);
907 if (msg
->msg_flags
&MSG_CONFIRM
)
912 if (unlikely(up
->pending
)) {
913 /* The socket is already corked while preparing it. */
914 /* ... which is an evident application bug. --ANK */
917 LIMIT_NETDEBUG(KERN_DEBUG
"udp cork app bug 2\n");
922 up
->pending
= AF_INET6
;
926 getfrag
= is_udplite
? udplite_getfrag
: ip_generic_getfrag
;
927 err
= ip6_append_data(sk
, getfrag
, msg
->msg_iov
, ulen
,
928 sizeof(struct udphdr
), hlimit
, tclass
, opt
, &fl
,
929 (struct rt6_info
*)dst
,
930 corkreq
? msg
->msg_flags
|MSG_MORE
: msg
->msg_flags
);
932 udp_v6_flush_pending_frames(sk
);
934 err
= udp_v6_push_pending_frames(sk
);
935 else if (unlikely(skb_queue_empty(&sk
->sk_write_queue
)))
940 ip6_dst_store(sk
, dst
,
941 ipv6_addr_equal(&fl
.fl6_dst
, &np
->daddr
) ?
943 #ifdef CONFIG_IPV6_SUBTREES
944 ipv6_addr_equal(&fl
.fl6_src
, &np
->saddr
) ?
955 err
= np
->recverr
? net_xmit_errno(err
) : 0;
959 fl6_sock_release(flowlabel
);
963 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
964 * ENOBUFS might not be good (it's not tunable per se), but otherwise
965 * we don't have a good statistic (IpOutDiscards but it can be too many
966 * things). We could add another new stat but at least for now that
967 * seems like overkill.
969 if (err
== -ENOBUFS
|| test_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
)) {
970 UDP6_INC_STATS_USER(sock_net(sk
),
971 UDP_MIB_SNDBUFERRORS
, is_udplite
);
977 if (!(msg
->msg_flags
&MSG_PROBE
) || len
)
978 goto back_from_confirm
;
983 void udpv6_destroy_sock(struct sock
*sk
)
986 udp_v6_flush_pending_frames(sk
);
989 inet6_destroy_sock(sk
);
993 * Socket option code for UDP
995 int udpv6_setsockopt(struct sock
*sk
, int level
, int optname
,
996 char __user
*optval
, int optlen
)
998 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
999 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1000 udp_v6_push_pending_frames
);
1001 return ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
1004 #ifdef CONFIG_COMPAT
1005 int compat_udpv6_setsockopt(struct sock
*sk
, int level
, int optname
,
1006 char __user
*optval
, int optlen
)
1008 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1009 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1010 udp_v6_push_pending_frames
);
1011 return compat_ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
1015 int udpv6_getsockopt(struct sock
*sk
, int level
, int optname
,
1016 char __user
*optval
, int __user
*optlen
)
1018 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1019 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1020 return ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
1023 #ifdef CONFIG_COMPAT
1024 int compat_udpv6_getsockopt(struct sock
*sk
, int level
, int optname
,
1025 char __user
*optval
, int __user
*optlen
)
1027 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1028 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1029 return compat_ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
1033 static struct inet6_protocol udpv6_protocol
= {
1034 .handler
= udpv6_rcv
,
1035 .err_handler
= udpv6_err
,
1036 .flags
= INET6_PROTO_NOPOLICY
|INET6_PROTO_FINAL
,
1039 /* ------------------------------------------------------------------------ */
1040 #ifdef CONFIG_PROC_FS
1042 static void udp6_sock_seq_show(struct seq_file
*seq
, struct sock
*sp
, int bucket
)
1044 struct inet_sock
*inet
= inet_sk(sp
);
1045 struct ipv6_pinfo
*np
= inet6_sk(sp
);
1046 struct in6_addr
*dest
, *src
;
1050 src
= &np
->rcv_saddr
;
1051 destp
= ntohs(inet
->dport
);
1052 srcp
= ntohs(inet
->sport
);
1054 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1055 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1057 src
->s6_addr32
[0], src
->s6_addr32
[1],
1058 src
->s6_addr32
[2], src
->s6_addr32
[3], srcp
,
1059 dest
->s6_addr32
[0], dest
->s6_addr32
[1],
1060 dest
->s6_addr32
[2], dest
->s6_addr32
[3], destp
,
1062 sk_wmem_alloc_get(sp
),
1063 sk_rmem_alloc_get(sp
),
1067 atomic_read(&sp
->sk_refcnt
), sp
,
1068 atomic_read(&sp
->sk_drops
));
1071 int udp6_seq_show(struct seq_file
*seq
, void *v
)
1073 if (v
== SEQ_START_TOKEN
)
1078 "st tx_queue rx_queue tr tm->when retrnsmt"
1079 " uid timeout inode ref pointer drops\n");
1081 udp6_sock_seq_show(seq
, v
, ((struct udp_iter_state
*)seq
->private)->bucket
);
1085 static struct udp_seq_afinfo udp6_seq_afinfo
= {
1088 .udp_table
= &udp_table
,
1090 .owner
= THIS_MODULE
,
1093 .show
= udp6_seq_show
,
1097 int udp6_proc_init(struct net
*net
)
1099 return udp_proc_register(net
, &udp6_seq_afinfo
);
1102 void udp6_proc_exit(struct net
*net
) {
1103 udp_proc_unregister(net
, &udp6_seq_afinfo
);
1105 #endif /* CONFIG_PROC_FS */
1107 /* ------------------------------------------------------------------------ */
1109 struct proto udpv6_prot
= {
1111 .owner
= THIS_MODULE
,
1112 .close
= udp_lib_close
,
1113 .connect
= ip6_datagram_connect
,
1114 .disconnect
= udp_disconnect
,
1116 .destroy
= udpv6_destroy_sock
,
1117 .setsockopt
= udpv6_setsockopt
,
1118 .getsockopt
= udpv6_getsockopt
,
1119 .sendmsg
= udpv6_sendmsg
,
1120 .recvmsg
= udpv6_recvmsg
,
1121 .backlog_rcv
= udpv6_queue_rcv_skb
,
1122 .hash
= udp_lib_hash
,
1123 .unhash
= udp_lib_unhash
,
1124 .get_port
= udp_v6_get_port
,
1125 .memory_allocated
= &udp_memory_allocated
,
1126 .sysctl_mem
= sysctl_udp_mem
,
1127 .sysctl_wmem
= &sysctl_udp_wmem_min
,
1128 .sysctl_rmem
= &sysctl_udp_rmem_min
,
1129 .obj_size
= sizeof(struct udp6_sock
),
1130 .slab_flags
= SLAB_DESTROY_BY_RCU
,
1131 .h
.udp_table
= &udp_table
,
1132 #ifdef CONFIG_COMPAT
1133 .compat_setsockopt
= compat_udpv6_setsockopt
,
1134 .compat_getsockopt
= compat_udpv6_getsockopt
,
1138 static struct inet_protosw udpv6_protosw
= {
1140 .protocol
= IPPROTO_UDP
,
1141 .prot
= &udpv6_prot
,
1142 .ops
= &inet6_dgram_ops
,
1144 .no_check
= UDP_CSUM_DEFAULT
,
1145 .flags
= INET_PROTOSW_PERMANENT
,
1149 int __init
udpv6_init(void)
1153 ret
= inet6_add_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1157 ret
= inet6_register_protosw(&udpv6_protosw
);
1159 goto out_udpv6_protocol
;
1164 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1168 void udpv6_exit(void)
1170 inet6_unregister_protosw(&udpv6_protosw
);
1171 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);