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)
292 skb_free_datagram(sk, skb);
299 if (!skb_kill_datagram(sk, skb, flags)) {
301 UDP_INC_STATS_USER(sock_net(sk),
302 UDP_MIB_INERRORS, is_udplite);
304 UDP6_INC_STATS_USER(sock_net(sk),
305 UDP_MIB_INERRORS, is_udplite);
309 if (flags & MSG_DONTWAIT)
314 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
315 u8 type, u8 code, int offset, __be32 info,
316 struct udp_table *udptable)
318 struct ipv6_pinfo *np;
319 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
320 struct in6_addr *saddr = &hdr->saddr;
321 struct in6_addr *daddr = &hdr->daddr;
322 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
326 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
327 saddr, uh->source, inet6_iif(skb), udptable);
333 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
336 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
340 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
343 sk->sk_error_report(sk);
348 static __inline__ void udpv6_err(struct sk_buff *skb,
349 struct inet6_skb_parm *opt, u8 type,
350 u8 code, int offset, __be32 info )
352 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
355 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
357 struct udp_sock *up = udp_sk(sk);
359 int is_udplite = IS_UDPLITE(sk);
361 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
365 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
367 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
369 if (up->pcrlen == 0) { /* full coverage was set */
370 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
371 " %d while full coverage %d requested\n",
372 UDP_SKB_CB(skb)->cscov, skb->len);
375 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
376 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
377 "too small, need min %d\n",
378 UDP_SKB_CB(skb)->cscov, up->pcrlen);
384 if (udp_lib_checksum_complete(skb))
388 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
389 /* Note that an ENOMEM error is charged twice */
391 UDP6_INC_STATS_BH(sock_net(sk),
392 UDP_MIB_RCVBUFERRORS, is_udplite);
393 atomic_inc(&sk->sk_drops);
400 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
405 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
406 __be16 loc_port, struct in6_addr *loc_addr,
407 __be16 rmt_port, struct in6_addr *rmt_addr,
410 struct hlist_nulls_node *node;
412 unsigned short num = ntohs(loc_port);
414 sk_nulls_for_each_from(s, node) {
415 struct inet_sock *inet = inet_sk(s);
417 if (!net_eq(sock_net(s), net))
420 if (s->sk_hash == num && s->sk_family == PF_INET6) {
421 struct ipv6_pinfo *np = inet6_sk(s);
423 if (inet->dport != rmt_port)
426 if (!ipv6_addr_any(&np->daddr) &&
427 !ipv6_addr_equal(&np->daddr, rmt_addr))
430 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
433 if (!ipv6_addr_any(&np->rcv_saddr)) {
434 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
437 if (!inet6_mc_check(s, loc_addr, rmt_addr))
446 * Note: called only from the BH handler context,
447 * so we don't need to lock the hashes.
449 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
450 struct in6_addr *saddr, struct in6_addr *daddr,
451 struct udp_table *udptable)
453 struct sock *sk, *sk2;
454 const struct udphdr *uh = udp_hdr(skb);
455 struct udp_hslot *hslot = &udptable->hash[udp_hashfn(net, ntohs(uh->dest))];
458 spin_lock(&hslot->lock);
459 sk = sk_nulls_head(&hslot->head);
460 dif = inet6_iif(skb);
461 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
468 while ((sk2 = udp_v6_mcast_next(net, sk_nulls_next(sk2), uh->dest, daddr,
469 uh->source, saddr, dif))) {
470 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
473 if (!sock_owned_by_user(sk2))
474 udpv6_queue_rcv_skb(sk2, buff);
476 sk_add_backlog(sk2, buff);
481 if (!sock_owned_by_user(sk))
482 udpv6_queue_rcv_skb(sk, skb);
484 sk_add_backlog(sk, skb);
487 spin_unlock(&hslot->lock);
491 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
496 UDP_SKB_CB(skb)->partial_cov = 0;
497 UDP_SKB_CB(skb)->cscov = skb->len;
499 if (proto == IPPROTO_UDPLITE) {
500 err = udplite_checksum_init(skb, uh);
505 if (uh->check == 0) {
506 /* RFC 2460 section 8.1 says that we SHOULD log
507 this error. Well, it is reasonable.
509 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
512 if (skb->ip_summed == CHECKSUM_COMPLETE &&
513 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
514 skb->len, proto, skb->csum))
515 skb->ip_summed = CHECKSUM_UNNECESSARY;
517 if (!skb_csum_unnecessary(skb))
518 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
519 &ipv6_hdr(skb)->daddr,
520 skb->len, proto, 0));
525 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
530 struct net_device *dev = skb->dev;
531 struct in6_addr *saddr, *daddr;
533 struct net *net = dev_net(skb->dev);
535 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
538 saddr = &ipv6_hdr(skb)->saddr;
539 daddr = &ipv6_hdr(skb)->daddr;
542 ulen = ntohs(uh->len);
546 if (proto == IPPROTO_UDP) {
547 /* UDP validates ulen. */
549 /* Check for jumbo payload */
553 if (ulen < sizeof(*uh))
556 if (ulen < skb->len) {
557 if (pskb_trim_rcsum(skb, ulen))
559 saddr = &ipv6_hdr(skb)->saddr;
560 daddr = &ipv6_hdr(skb)->daddr;
565 if (udp6_csum_init(skb, uh, proto))
569 * Multicast receive code
571 if (ipv6_addr_is_multicast(daddr))
572 return __udp6_lib_mcast_deliver(net, skb,
573 saddr, daddr, udptable);
578 * check socket cache ... must talk to Alan about his plans
579 * for sock caches... i'll skip this for now.
581 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
584 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
587 if (udp_lib_checksum_complete(skb))
589 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS,
590 proto == IPPROTO_UDPLITE);
592 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
601 if (!sock_owned_by_user(sk))
602 udpv6_queue_rcv_skb(sk, skb);
604 sk_add_backlog(sk, skb);
610 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
611 proto == IPPROTO_UDPLITE ? "-Lite" : "",
615 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
620 static __inline__ int udpv6_rcv(struct sk_buff *skb)
622 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
626 * Throw away all pending data and cancel the corking. Socket is locked.
628 static void udp_v6_flush_pending_frames(struct sock *sk)
630 struct udp_sock *up = udp_sk(sk);
632 if (up->pending == AF_INET)
633 udp_flush_pending_frames(sk);
634 else if (up->pending) {
637 ip6_flush_pending_frames(sk);
642 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
643 * @sk: socket we are sending on
644 * @skb: sk_buff containing the filled-in UDP header
645 * (checksum field must be zeroed out)
647 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
648 const struct in6_addr *saddr,
649 const struct in6_addr *daddr, int len)
652 struct udphdr *uh = udp_hdr(skb);
655 if (skb_queue_len(&sk->sk_write_queue) == 1) {
656 /* Only one fragment on the socket. */
657 skb->csum_start = skb_transport_header(skb) - skb->head;
658 skb->csum_offset = offsetof(struct udphdr, check);
659 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
662 * HW-checksum won't work as there are two or more
663 * fragments on the socket so that all csums of sk_buffs
666 offset = skb_transport_offset(skb);
667 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
669 skb->ip_summed = CHECKSUM_NONE;
671 skb_queue_walk(&sk->sk_write_queue, skb) {
672 csum = csum_add(csum, skb->csum);
675 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
678 uh->check = CSUM_MANGLED_0;
686 static int udp_v6_push_pending_frames(struct sock *sk)
690 struct udp_sock *up = udp_sk(sk);
691 struct inet_sock *inet = inet_sk(sk);
692 struct flowi *fl = &inet->cork.fl;
694 int is_udplite = IS_UDPLITE(sk);
697 /* Grab the skbuff where UDP header space exists. */
698 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
702 * Create a UDP header
705 uh->source = fl->fl_ip_sport;
706 uh->dest = fl->fl_ip_dport;
707 uh->len = htons(up->len);
711 csum = udplite_csum_outgoing(sk, skb);
712 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
713 udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst,
717 csum = udp_csum_outgoing(sk, skb);
719 /* add protocol-dependent pseudo-header */
720 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
721 up->len, fl->proto, csum );
723 uh->check = CSUM_MANGLED_0;
726 err = ip6_push_pending_frames(sk);
731 UDP6_INC_STATS_USER(sock_net(sk),
732 UDP_MIB_OUTDATAGRAMS, is_udplite);
736 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
737 struct msghdr *msg, size_t len)
739 struct ipv6_txoptions opt_space;
740 struct udp_sock *up = udp_sk(sk);
741 struct inet_sock *inet = inet_sk(sk);
742 struct ipv6_pinfo *np = inet6_sk(sk);
743 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
744 struct in6_addr *daddr, *final_p = NULL, final;
745 struct ipv6_txoptions *opt = NULL;
746 struct ip6_flowlabel *flowlabel = NULL;
748 struct dst_entry *dst;
749 int addr_len = msg->msg_namelen;
753 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
756 int is_udplite = IS_UDPLITE(sk);
757 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
759 /* destination address check */
761 if (addr_len < offsetof(struct sockaddr, sa_data))
764 switch (sin6->sin6_family) {
766 if (addr_len < SIN6_LEN_RFC2133)
768 daddr = &sin6->sin6_addr;
773 msg->msg_name = sin6 = NULL;
774 msg->msg_namelen = addr_len = 0;
780 } else if (!up->pending) {
781 if (sk->sk_state != TCP_ESTABLISHED)
782 return -EDESTADDRREQ;
788 if (ipv6_addr_v4mapped(daddr)) {
789 struct sockaddr_in sin;
790 sin.sin_family = AF_INET;
791 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
792 sin.sin_addr.s_addr = daddr->s6_addr32[3];
793 msg->msg_name = &sin;
794 msg->msg_namelen = sizeof(sin);
796 if (__ipv6_only_sock(sk))
798 return udp_sendmsg(iocb, sk, msg, len);
802 if (up->pending == AF_INET)
803 return udp_sendmsg(iocb, sk, msg, len);
805 /* Rough check on arithmetic overflow,
806 better check is made in ip6_append_data().
808 if (len > INT_MAX - sizeof(struct udphdr))
813 * There are pending frames.
814 * The socket lock must be held while it's corked.
817 if (likely(up->pending)) {
818 if (unlikely(up->pending != AF_INET6)) {
820 return -EAFNOSUPPORT;
827 ulen += sizeof(struct udphdr);
829 memset(&fl, 0, sizeof(fl));
832 if (sin6->sin6_port == 0)
835 fl.fl_ip_dport = sin6->sin6_port;
836 daddr = &sin6->sin6_addr;
839 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
840 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
841 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
842 if (flowlabel == NULL)
844 daddr = &flowlabel->dst;
849 * Otherwise it will be difficult to maintain
852 if (sk->sk_state == TCP_ESTABLISHED &&
853 ipv6_addr_equal(daddr, &np->daddr))
856 if (addr_len >= sizeof(struct sockaddr_in6) &&
857 sin6->sin6_scope_id &&
858 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
859 fl.oif = sin6->sin6_scope_id;
861 if (sk->sk_state != TCP_ESTABLISHED)
862 return -EDESTADDRREQ;
864 fl.fl_ip_dport = inet->dport;
866 fl.fl6_flowlabel = np->flow_label;
871 fl.oif = sk->sk_bound_dev_if;
874 fl.oif = np->sticky_pktinfo.ipi6_ifindex;
876 if (msg->msg_controllen) {
878 memset(opt, 0, sizeof(struct ipv6_txoptions));
879 opt->tot_len = sizeof(*opt);
881 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass);
883 fl6_sock_release(flowlabel);
886 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
887 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
888 if (flowlabel == NULL)
891 if (!(opt->opt_nflen|opt->opt_flen))
898 opt = fl6_merge_options(&opt_space, flowlabel, opt);
899 opt = ipv6_fixup_options(&opt_space, opt);
901 fl.proto = sk->sk_protocol;
902 if (!ipv6_addr_any(daddr))
903 ipv6_addr_copy(&fl.fl6_dst, daddr);
905 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
906 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
907 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
908 fl.fl_ip_sport = inet->sport;
910 /* merge ip6_build_xmit from ip6_output */
911 if (opt && opt->srcrt) {
912 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
913 ipv6_addr_copy(&final, &fl.fl6_dst);
914 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
919 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
920 fl.oif = np->mcast_oif;
924 security_sk_classify_flow(sk, &fl);
926 err = ip6_sk_dst_lookup(sk, &dst, &fl);
930 ipv6_addr_copy(&fl.fl6_dst, final_p);
932 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
935 err = ip6_dst_blackhole(sk, &dst, &fl);
941 if (ipv6_addr_is_multicast(&fl.fl6_dst))
942 hlimit = np->mcast_hops;
944 hlimit = np->hop_limit;
946 hlimit = ip6_dst_hoplimit(dst);
955 if (msg->msg_flags&MSG_CONFIRM)
960 if (unlikely(up->pending)) {
961 /* The socket is already corked while preparing it. */
962 /* ... which is an evident application bug. --ANK */
965 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
970 up->pending = AF_INET6;
974 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
975 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
976 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
977 (struct rt6_info*)dst,
978 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
980 udp_v6_flush_pending_frames(sk);
982 err = udp_v6_push_pending_frames(sk);
983 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
988 ip6_dst_store(sk, dst,
989 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
991 #ifdef CONFIG_IPV6_SUBTREES
992 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
1003 err = np->recverr ? net_xmit_errno(err) : 0;
1007 fl6_sock_release(flowlabel);
1011 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1012 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1013 * we don't have a good statistic (IpOutDiscards but it can be too many
1014 * things). We could add another new stat but at least for now that
1015 * seems like overkill.
1017 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1018 UDP6_INC_STATS_USER(sock_net(sk),
1019 UDP_MIB_SNDBUFERRORS, is_udplite);
1025 if (!(msg->msg_flags&MSG_PROBE) || len)
1026 goto back_from_confirm;
1031 void udpv6_destroy_sock(struct sock *sk)
1034 udp_v6_flush_pending_frames(sk);
1037 inet6_destroy_sock(sk);
1041 * Socket option code for UDP
1043 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1044 char __user *optval, int optlen)
1046 if (level == SOL_UDP || level == SOL_UDPLITE)
1047 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1048 udp_v6_push_pending_frames);
1049 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1052 #ifdef CONFIG_COMPAT
1053 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1054 char __user *optval, int optlen)
1056 if (level == SOL_UDP || level == SOL_UDPLITE)
1057 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1058 udp_v6_push_pending_frames);
1059 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1063 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1064 char __user *optval, int __user *optlen)
1066 if (level == SOL_UDP || level == SOL_UDPLITE)
1067 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1068 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1071 #ifdef CONFIG_COMPAT
1072 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1073 char __user *optval, int __user *optlen)
1075 if (level == SOL_UDP || level == SOL_UDPLITE)
1076 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1077 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1081 static int udp6_ufo_send_check(struct sk_buff *skb)
1083 struct ipv6hdr *ipv6h;
1086 if (!pskb_may_pull(skb, sizeof(*uh)))
1089 ipv6h = ipv6_hdr(skb);
1092 uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
1094 skb->csum_start = skb_transport_header(skb) - skb->head;
1095 skb->csum_offset = offsetof(struct udphdr, check);
1096 skb->ip_summed = CHECKSUM_PARTIAL;
1100 static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, int features)
1102 struct sk_buff *segs = ERR_PTR(-EINVAL);
1104 unsigned int unfrag_ip6hlen, unfrag_len;
1105 struct frag_hdr *fptr;
1106 u8 *mac_start, *prevhdr;
1108 u8 frag_hdr_sz = sizeof(struct frag_hdr);
1112 mss = skb_shinfo(skb)->gso_size;
1113 if (unlikely(skb->len <= mss))
1116 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
1117 /* Packet is from an untrusted source, reset gso_segs. */
1118 int type = skb_shinfo(skb)->gso_type;
1120 if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) ||
1121 !(type & (SKB_GSO_UDP))))
1124 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
1130 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
1131 * do checksum of UDP packets sent as multiple IP fragments.
1133 offset = skb->csum_start - skb_headroom(skb);
1134 csum = skb_checksum(skb, offset, skb->len- offset, 0);
1135 offset += skb->csum_offset;
1136 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1137 skb->ip_summed = CHECKSUM_NONE;
1139 /* Check if there is enough headroom to insert fragment header. */
1140 if ((skb_headroom(skb) < frag_hdr_sz) &&
1141 pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC))
1144 /* Find the unfragmentable header and shift it left by frag_hdr_sz
1145 * bytes to insert fragment header.
1147 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
1149 *prevhdr = NEXTHDR_FRAGMENT;
1150 unfrag_len = skb_network_header(skb) - skb_mac_header(skb) +
1152 mac_start = skb_mac_header(skb);
1153 memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len);
1155 skb->mac_header -= frag_hdr_sz;
1156 skb->network_header -= frag_hdr_sz;
1158 fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
1159 fptr->nexthdr = nexthdr;
1161 ipv6_select_ident(fptr);
1163 /* Fragment the skb. ipv6 header and the remaining fields of the
1164 * fragment header are updated in ipv6_gso_segment()
1166 segs = skb_segment(skb, features);
1172 static struct inet6_protocol udpv6_protocol = {
1173 .handler = udpv6_rcv,
1174 .err_handler = udpv6_err,
1175 .gso_send_check = udp6_ufo_send_check,
1176 .gso_segment = udp6_ufo_fragment,
1177 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1180 /* ------------------------------------------------------------------------ */
1181 #ifdef CONFIG_PROC_FS
1183 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1185 struct inet_sock *inet = inet_sk(sp);
1186 struct ipv6_pinfo *np = inet6_sk(sp);
1187 struct in6_addr *dest, *src;
1191 src = &np->rcv_saddr;
1192 destp = ntohs(inet->dport);
1193 srcp = ntohs(inet->sport);
1195 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1196 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1198 src->s6_addr32[0], src->s6_addr32[1],
1199 src->s6_addr32[2], src->s6_addr32[3], srcp,
1200 dest->s6_addr32[0], dest->s6_addr32[1],
1201 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1203 sk_wmem_alloc_get(sp),
1204 sk_rmem_alloc_get(sp),
1208 atomic_read(&sp->sk_refcnt), sp,
1209 atomic_read(&sp->sk_drops));
1212 int udp6_seq_show(struct seq_file *seq, void *v)
1214 if (v == SEQ_START_TOKEN)
1219 "st tx_queue rx_queue tr tm->when retrnsmt"
1220 " uid timeout inode ref pointer drops\n");
1222 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1226 static struct udp_seq_afinfo udp6_seq_afinfo = {
1229 .udp_table = &udp_table,
1231 .owner = THIS_MODULE,
1234 .show = udp6_seq_show,
1238 int udp6_proc_init(struct net *net)
1240 return udp_proc_register(net, &udp6_seq_afinfo);
1243 void udp6_proc_exit(struct net *net) {
1244 udp_proc_unregister(net, &udp6_seq_afinfo);
1246 #endif /* CONFIG_PROC_FS */
1248 /* ------------------------------------------------------------------------ */
1250 struct proto udpv6_prot = {
1252 .owner = THIS_MODULE,
1253 .close = udp_lib_close,
1254 .connect = ip6_datagram_connect,
1255 .disconnect = udp_disconnect,
1257 .destroy = udpv6_destroy_sock,
1258 .setsockopt = udpv6_setsockopt,
1259 .getsockopt = udpv6_getsockopt,
1260 .sendmsg = udpv6_sendmsg,
1261 .recvmsg = udpv6_recvmsg,
1262 .backlog_rcv = udpv6_queue_rcv_skb,
1263 .hash = udp_lib_hash,
1264 .unhash = udp_lib_unhash,
1265 .get_port = udp_v6_get_port,
1266 .memory_allocated = &udp_memory_allocated,
1267 .sysctl_mem = sysctl_udp_mem,
1268 .sysctl_wmem = &sysctl_udp_wmem_min,
1269 .sysctl_rmem = &sysctl_udp_rmem_min,
1270 .obj_size = sizeof(struct udp6_sock),
1271 .slab_flags = SLAB_DESTROY_BY_RCU,
1272 .h.udp_table = &udp_table,
1273 #ifdef CONFIG_COMPAT
1274 .compat_setsockopt = compat_udpv6_setsockopt,
1275 .compat_getsockopt = compat_udpv6_getsockopt,
1279 static struct inet_protosw udpv6_protosw = {
1281 .protocol = IPPROTO_UDP,
1282 .prot = &udpv6_prot,
1283 .ops = &inet6_dgram_ops,
1285 .no_check = UDP_CSUM_DEFAULT,
1286 .flags = INET_PROTOSW_PERMANENT,
1290 int __init udpv6_init(void)
1294 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1298 ret = inet6_register_protosw(&udpv6_protosw);
1300 goto out_udpv6_protocol;
1305 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1309 void udpv6_exit(void)
1311 inet6_unregister_protosw(&udpv6_protosw);
1312 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);