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/config.h>
27 #include <linux/errno.h>
28 #include <linux/types.h>
29 #include <linux/socket.h>
30 #include <linux/sockios.h>
31 #include <linux/sched.h>
32 #include <linux/net.h>
33 #include <linux/in6.h>
34 #include <linux/netdevice.h>
35 #include <linux/if_arp.h>
36 #include <linux/ipv6.h>
37 #include <linux/icmpv6.h>
38 #include <linux/init.h>
39 #include <asm/uaccess.h>
45 #include <net/ndisc.h>
46 #include <net/protocol.h>
47 #include <net/transp_v6.h>
48 #include <net/ip6_route.h>
49 #include <net/addrconf.h>
52 #include <net/inet_common.h>
54 #include <net/checksum.h>
57 #include <linux/proc_fs.h>
58 #include <linux/seq_file.h>
60 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6);
62 /* Grrr, addr_type already calculated by caller, but I don't want
63 * to add some silly "cookie" argument to this method just for that.
65 static int udp_v6_get_port(struct sock *sk, unsigned short snum)
68 struct hlist_node *node;
70 write_lock_bh(&udp_hash_lock);
72 int best_size_so_far, best, result, i;
74 if (udp_port_rover > sysctl_local_port_range[1] ||
75 udp_port_rover < sysctl_local_port_range[0])
76 udp_port_rover = sysctl_local_port_range[0];
77 best_size_so_far = 32767;
78 best = result = udp_port_rover;
79 for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) {
81 struct hlist_head *list;
83 list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)];
84 if (hlist_empty(list)) {
85 if (result > sysctl_local_port_range[1])
86 result = sysctl_local_port_range[0] +
87 ((result - sysctl_local_port_range[0]) &
88 (UDP_HTABLE_SIZE - 1));
92 sk_for_each(sk2, node, list)
93 if (++size >= best_size_so_far)
95 best_size_so_far = size;
100 for(;; result += UDP_HTABLE_SIZE) {
101 if (result > sysctl_local_port_range[1])
102 result = sysctl_local_port_range[0]
103 + ((result - sysctl_local_port_range[0]) &
104 (UDP_HTABLE_SIZE - 1));
105 if (!udp_lport_inuse(result))
109 udp_port_rover = snum = result;
111 sk_for_each(sk2, node,
112 &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) {
113 if (inet_sk(sk2)->num == snum &&
115 (!sk2->sk_bound_dev_if ||
116 !sk->sk_bound_dev_if ||
117 sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
118 (!sk2->sk_reuse || !sk->sk_reuse) &&
119 ipv6_rcv_saddr_equal(sk, sk2))
124 inet_sk(sk)->num = snum;
125 if (sk_unhashed(sk)) {
126 sk_add_node(sk, &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]);
127 sock_prot_inc_use(sk->sk_prot);
129 write_unlock_bh(&udp_hash_lock);
133 write_unlock_bh(&udp_hash_lock);
137 static void udp_v6_hash(struct sock *sk)
142 static void udp_v6_unhash(struct sock *sk)
144 write_lock_bh(&udp_hash_lock);
145 if (sk_del_node_init(sk)) {
146 inet_sk(sk)->num = 0;
147 sock_prot_dec_use(sk->sk_prot);
149 write_unlock_bh(&udp_hash_lock);
152 static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport,
153 struct in6_addr *daddr, u16 dport, int dif)
155 struct sock *sk, *result = NULL;
156 struct hlist_node *node;
157 unsigned short hnum = ntohs(dport);
160 read_lock(&udp_hash_lock);
161 sk_for_each(sk, node, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) {
162 struct inet_opt *inet = inet_sk(sk);
164 if (inet->num == hnum && sk->sk_family == PF_INET6) {
165 struct ipv6_pinfo *np = inet6_sk(sk);
168 if (inet->dport != sport)
172 if (!ipv6_addr_any(&np->rcv_saddr)) {
173 if (ipv6_addr_cmp(&np->rcv_saddr, daddr))
177 if (!ipv6_addr_any(&np->daddr)) {
178 if (ipv6_addr_cmp(&np->daddr, saddr))
182 if (sk->sk_bound_dev_if) {
183 if (sk->sk_bound_dev_if != dif)
190 } else if(score > badness) {
198 read_unlock(&udp_hash_lock);
206 int udpv6_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
208 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
209 struct inet_opt *inet = inet_sk(sk);
210 struct ipv6_pinfo *np = inet6_sk(sk);
211 struct in6_addr *daddr;
212 struct dst_entry *dst;
214 struct ip6_flowlabel *flowlabel = NULL;
218 if (usin->sin6_family == AF_INET) {
219 if (__ipv6_only_sock(sk))
220 return -EAFNOSUPPORT;
221 err = udp_connect(sk, uaddr, addr_len);
225 if (addr_len < SIN6_LEN_RFC2133)
228 if (usin->sin6_family != AF_INET6)
229 return -EAFNOSUPPORT;
231 memset(&fl, 0, sizeof(fl));
233 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
234 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
235 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
236 if (flowlabel == NULL)
238 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
242 addr_type = ipv6_addr_type(&usin->sin6_addr);
244 if (addr_type == IPV6_ADDR_ANY) {
248 usin->sin6_addr.s6_addr[15] = 0x01;
251 daddr = &usin->sin6_addr;
253 if (addr_type == IPV6_ADDR_MAPPED) {
254 struct sockaddr_in sin;
256 if (__ipv6_only_sock(sk)) {
260 sin.sin_family = AF_INET;
261 sin.sin_addr.s_addr = daddr->s6_addr32[3];
262 sin.sin_port = usin->sin6_port;
264 err = udp_connect(sk, (struct sockaddr*) &sin, sizeof(sin));
270 ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr);
272 if (ipv6_addr_any(&np->saddr)) {
273 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff),
277 if (ipv6_addr_any(&np->rcv_saddr)) {
278 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff),
284 if (addr_type&IPV6_ADDR_LINKLOCAL) {
285 if (addr_len >= sizeof(struct sockaddr_in6) &&
286 usin->sin6_scope_id) {
287 if (sk->sk_bound_dev_if &&
288 sk->sk_bound_dev_if != usin->sin6_scope_id) {
292 sk->sk_bound_dev_if = usin->sin6_scope_id;
293 if (!sk->sk_bound_dev_if &&
294 (addr_type & IPV6_ADDR_MULTICAST))
295 fl.oif = np->mcast_oif;
298 /* Connect to link-local address requires an interface */
299 if (!sk->sk_bound_dev_if) {
305 ipv6_addr_copy(&np->daddr, daddr);
306 np->flow_label = fl.fl6_flowlabel;
308 inet->dport = usin->sin6_port;
311 * Check for a route to destination an obtain the
312 * destination cache for it.
315 fl.proto = IPPROTO_UDP;
316 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
317 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
318 fl.oif = sk->sk_bound_dev_if;
319 fl.fl_ip_dport = inet->dport;
320 fl.fl_ip_sport = inet->sport;
322 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
323 fl.oif = np->mcast_oif;
326 if (flowlabel->opt && flowlabel->opt->srcrt) {
327 struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt;
328 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
330 } else if (np->opt && np->opt->srcrt) {
331 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
332 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
335 err = ip6_dst_lookup(sk, &dst, &fl);
339 /* source address lookup done in ip6_dst_lookup */
341 if (ipv6_addr_any(&np->saddr))
342 ipv6_addr_copy(&np->saddr, &fl.fl6_src);
344 if (ipv6_addr_any(&np->rcv_saddr)) {
345 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
346 inet->rcv_saddr = LOOPBACK4_IPV6;
349 ip6_dst_store(sk, dst,
350 !ipv6_addr_cmp(&fl.fl6_dst, &np->daddr) ?
353 sk->sk_state = TCP_ESTABLISHED;
355 fl6_sock_release(flowlabel);
359 static void udpv6_close(struct sock *sk, long timeout)
361 inet_sock_release(sk);
365 * This should be easy, if there is something there we
366 * return it, otherwise we block.
369 static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
370 struct msghdr *msg, size_t len,
371 int noblock, int flags, int *addr_len)
373 struct ipv6_pinfo *np = inet6_sk(sk);
379 *addr_len=sizeof(struct sockaddr_in6);
381 if (flags & MSG_ERRQUEUE)
382 return ipv6_recv_error(sk, msg, len);
385 skb = skb_recv_datagram(sk, flags, noblock, &err);
389 copied = skb->len - sizeof(struct udphdr);
392 msg->msg_flags |= MSG_TRUNC;
395 if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
396 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
398 } else if (msg->msg_flags&MSG_TRUNC) {
399 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
401 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
404 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
411 sock_recv_timestamp(msg, sk, skb);
413 /* Copy the address. */
415 struct sockaddr_in6 *sin6;
417 sin6 = (struct sockaddr_in6 *) msg->msg_name;
418 sin6->sin6_family = AF_INET6;
419 sin6->sin6_port = skb->h.uh->source;
420 sin6->sin6_flowinfo = 0;
421 sin6->sin6_scope_id = 0;
423 if (skb->protocol == htons(ETH_P_IP)) {
424 struct inet_opt *inet = inet_sk(sk);
426 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
427 htonl(0xffff), skb->nh.iph->saddr);
428 if (inet->cmsg_flags)
429 ip_cmsg_recv(msg, skb);
431 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
434 datagram_recv_ctl(sk, msg, skb);
435 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
436 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
437 sin6->sin6_scope_id = opt->iif;
444 skb_free_datagram(sk, skb);
450 if (flags&MSG_PEEK) {
452 spin_lock_irq(&sk->sk_receive_queue.lock);
453 if (skb == skb_peek(&sk->sk_receive_queue)) {
454 __skb_unlink(skb, &sk->sk_receive_queue);
457 spin_unlock_irq(&sk->sk_receive_queue.lock);
462 skb_free_datagram(sk, skb);
464 if (flags & MSG_DONTWAIT) {
465 UDP6_INC_STATS_USER(UdpInErrors);
471 static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
472 int type, int code, int offset, __u32 info)
474 struct ipv6_pinfo *np;
475 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
476 struct net_device *dev = skb->dev;
477 struct in6_addr *saddr = &hdr->saddr;
478 struct in6_addr *daddr = &hdr->daddr;
479 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
483 sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex);
490 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
493 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
497 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
500 sk->sk_error_report(sk);
505 static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
507 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
512 if (sk->sk_filter && skb->ip_summed != CHECKSUM_UNNECESSARY) {
513 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
514 UDP6_INC_STATS_BH(UdpInErrors);
518 skb->ip_summed = CHECKSUM_UNNECESSARY;
521 if (sock_queue_rcv_skb(sk,skb)<0) {
522 UDP6_INC_STATS_BH(UdpInErrors);
526 UDP6_INC_STATS_BH(UdpInDatagrams);
530 static struct sock *udp_v6_mcast_next(struct sock *sk,
531 u16 loc_port, struct in6_addr *loc_addr,
532 u16 rmt_port, struct in6_addr *rmt_addr,
535 struct hlist_node *node;
537 unsigned short num = ntohs(loc_port);
539 sk_for_each_from(s, node) {
540 struct inet_opt *inet = inet_sk(s);
542 if (inet->num == num && s->sk_family == PF_INET6) {
543 struct ipv6_pinfo *np = inet6_sk(s);
545 if (inet->dport != rmt_port)
548 if (!ipv6_addr_any(&np->daddr) &&
549 ipv6_addr_cmp(&np->daddr, rmt_addr))
552 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
555 if (!ipv6_addr_any(&np->rcv_saddr)) {
556 if (!ipv6_addr_cmp(&np->rcv_saddr, loc_addr))
560 if(!inet6_mc_check(s, loc_addr, rmt_addr))
569 * Note: called only from the BH handler context,
570 * so we don't need to lock the hashes.
572 static void udpv6_mcast_deliver(struct udphdr *uh,
573 struct in6_addr *saddr, struct in6_addr *daddr,
576 struct sock *sk, *sk2;
577 struct sk_buff *buff;
580 read_lock(&udp_hash_lock);
581 sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
582 dif = skb->dev->ifindex;
583 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
589 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
590 uh->source, saddr, dif))) {
592 buff = skb_clone(skb, GFP_ATOMIC);
596 if (udpv6_queue_rcv_skb(sk2, buff) >= 0)
601 if (udpv6_queue_rcv_skb(sk, skb) < 0) {
605 read_unlock(&udp_hash_lock);
608 static int udpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
610 struct sk_buff *skb = *pskb;
613 struct net_device *dev = skb->dev;
614 struct in6_addr *saddr, *daddr;
617 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
620 saddr = &skb->nh.ipv6h->saddr;
621 daddr = &skb->nh.ipv6h->daddr;
624 ulen = ntohs(uh->len);
626 /* Check for jumbo payload */
630 if (ulen > skb->len || ulen < sizeof(*uh))
633 if (uh->check == 0) {
634 /* RFC 2460 section 8.1 says that we SHOULD log
635 this error. Well, it is reasonable.
638 printk(KERN_INFO "IPv6: udp checksum is 0\n"));
642 if (ulen < skb->len) {
643 if (__pskb_trim(skb, ulen))
645 saddr = &skb->nh.ipv6h->saddr;
646 daddr = &skb->nh.ipv6h->daddr;
650 if (skb->ip_summed==CHECKSUM_HW) {
651 skb->ip_summed = CHECKSUM_UNNECESSARY;
652 if (csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) {
653 LIMIT_NETDEBUG(printk(KERN_DEBUG "udp v6 hw csum failure.\n"));
654 skb->ip_summed = CHECKSUM_NONE;
657 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
658 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
661 * Multicast receive code
663 if (ipv6_addr_is_multicast(daddr)) {
664 udpv6_mcast_deliver(uh, saddr, daddr, skb);
671 * check socket cache ... must talk to Alan about his plans
672 * for sock caches... i'll skip this for now.
674 sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
677 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
680 if (skb->ip_summed != CHECKSUM_UNNECESSARY &&
681 (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
683 UDP6_INC_STATS_BH(UdpNoPorts);
685 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
693 udpv6_queue_rcv_skb(sk, skb);
699 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
702 UDP6_INC_STATS_BH(UdpInErrors);
707 * Throw away all pending data and cancel the corking. Socket is locked.
709 static void udp_v6_flush_pending_frames(struct sock *sk)
711 struct udp_opt *up = udp_sk(sk);
716 ip6_flush_pending_frames(sk);
724 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_opt *up)
728 struct inet_opt *inet = inet_sk(sk);
729 struct flowi *fl = &inet->cork.fl;
732 /* Grab the skbuff where UDP header space exists. */
733 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
737 * Create a UDP header
740 uh->source = fl->fl_ip_sport;
741 uh->dest = fl->fl_ip_dport;
742 uh->len = htons(up->len);
745 if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
746 skb->ip_summed = CHECKSUM_NONE;
750 if (skb_queue_len(&sk->sk_write_queue) == 1) {
751 skb->csum = csum_partial((char *)uh,
752 sizeof(struct udphdr), skb->csum);
753 uh->check = csum_ipv6_magic(&fl->fl6_src,
755 up->len, fl->proto, skb->csum);
759 skb_queue_walk(&sk->sk_write_queue, skb) {
760 tmp_csum = csum_add(tmp_csum, skb->csum);
762 tmp_csum = csum_partial((char *)uh,
763 sizeof(struct udphdr), tmp_csum);
764 tmp_csum = csum_ipv6_magic(&fl->fl6_src,
766 up->len, fl->proto, tmp_csum);
767 uh->check = tmp_csum;
774 err = ip6_push_pending_frames(sk);
781 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
782 struct msghdr *msg, size_t len)
784 struct ipv6_txoptions opt_space;
785 struct udp_opt *up = udp_sk(sk);
786 struct inet_opt *inet = inet_sk(sk);
787 struct ipv6_pinfo *np = inet6_sk(sk);
788 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
789 struct in6_addr *daddr;
790 struct ipv6_txoptions *opt = NULL;
791 struct ip6_flowlabel *flowlabel = NULL;
792 struct flowi *fl = &inet->cork.fl;
793 struct dst_entry *dst;
794 int addr_len = msg->msg_namelen;
797 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
800 /* destination address check */
802 if (addr_len < offsetof(struct sockaddr, sa_data))
805 switch (sin6->sin6_family) {
807 if (addr_len < SIN6_LEN_RFC2133)
809 daddr = &sin6->sin6_addr;
814 msg->msg_name = sin6 = NULL;
815 msg->msg_namelen = addr_len = 0;
821 } else if (!up->pending) {
822 if (sk->sk_state != TCP_ESTABLISHED)
823 return -EDESTADDRREQ;
829 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
830 struct sockaddr_in sin;
831 sin.sin_family = AF_INET;
832 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
833 sin.sin_addr.s_addr = daddr->s6_addr32[3];
834 msg->msg_name = &sin;
835 msg->msg_namelen = sizeof(sin);
837 if (__ipv6_only_sock(sk))
839 return udp_sendmsg(iocb, sk, msg, len);
843 if (up->pending == AF_INET)
844 return udp_sendmsg(iocb, sk, msg, len);
846 /* Rough check on arithmetic overflow,
847 better check is made in ip6_build_xmit
849 if (len > INT_MAX - sizeof(struct udphdr))
854 * There are pending frames.
855 * The socket lock must be held while it's corked.
858 if (likely(up->pending)) {
859 if (unlikely(up->pending != AF_INET6)) {
868 ulen += sizeof(struct udphdr);
870 memset(fl, 0, sizeof(*fl));
873 if (sin6->sin6_port == 0)
876 fl->fl_ip_dport = sin6->sin6_port;
877 daddr = &sin6->sin6_addr;
880 fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
881 if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
882 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
883 if (flowlabel == NULL)
885 daddr = &flowlabel->dst;
890 * Otherwise it will be difficult to maintain
893 if (sk->sk_state == TCP_ESTABLISHED &&
894 !ipv6_addr_cmp(daddr, &np->daddr))
897 if (addr_len >= sizeof(struct sockaddr_in6) &&
898 sin6->sin6_scope_id &&
899 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
900 fl->oif = sin6->sin6_scope_id;
902 if (sk->sk_state != TCP_ESTABLISHED)
903 return -EDESTADDRREQ;
905 fl->fl_ip_dport = inet->dport;
907 fl->fl6_flowlabel = np->flow_label;
911 fl->oif = sk->sk_bound_dev_if;
913 if (msg->msg_controllen) {
915 memset(opt, 0, sizeof(struct ipv6_txoptions));
916 opt->tot_len = sizeof(*opt);
918 err = datagram_send_ctl(msg, fl, opt, &hlimit);
920 fl6_sock_release(flowlabel);
923 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
924 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
925 if (flowlabel == NULL)
928 if (!(opt->opt_nflen|opt->opt_flen))
934 opt = fl6_merge_options(&opt_space, flowlabel, opt);
936 fl->proto = IPPROTO_UDP;
937 ipv6_addr_copy(&fl->fl6_dst, daddr);
938 if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
939 ipv6_addr_copy(&fl->fl6_src, &np->saddr);
940 fl->fl_ip_sport = inet->sport;
942 /* merge ip6_build_xmit from ip6_output */
943 if (opt && opt->srcrt) {
944 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
945 ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
948 if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst))
949 fl->oif = np->mcast_oif;
951 err = ip6_dst_lookup(sk, &dst, fl);
956 if (ipv6_addr_is_multicast(&fl->fl6_dst))
957 hlimit = np->mcast_hops;
959 hlimit = np->hop_limit;
961 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
964 if (msg->msg_flags&MSG_CONFIRM)
969 if (unlikely(up->pending)) {
970 /* The socket is already corked while preparing it. */
971 /* ... which is an evident application bug. --ANK */
974 LIMIT_NETDEBUG(printk(KERN_DEBUG "udp cork app bug 2\n"));
979 up->pending = AF_INET6;
983 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen, sizeof(struct udphdr),
984 hlimit, opt, fl, (struct rt6_info*)dst,
985 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
987 udp_v6_flush_pending_frames(sk);
989 err = udp_v6_push_pending_frames(sk, up);
992 ip6_dst_store(sk, dst,
993 !ipv6_addr_cmp(&fl->fl6_dst, &np->daddr) ?
996 err = np->recverr ? net_xmit_errno(err) : 0;
999 fl6_sock_release(flowlabel);
1001 UDP6_INC_STATS_USER(UdpOutDatagrams);
1008 if (!(msg->msg_flags&MSG_PROBE) || len)
1009 goto back_from_confirm;
1014 static int udpv6_destroy_sock(struct sock *sk)
1017 udp_v6_flush_pending_frames(sk);
1020 inet6_destroy_sock(sk);
1026 * Socket option code for UDP
1028 static int udpv6_setsockopt(struct sock *sk, int level, int optname,
1029 char *optval, int optlen)
1031 struct udp_opt *up = udp_sk(sk);
1035 if (level != SOL_UDP)
1036 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1038 if(optlen<sizeof(int))
1041 if (get_user(val, (int *)optval))
1051 udp_v6_push_pending_frames(sk, up);
1057 up->encap_type = val;
1068 static int udpv6_getsockopt(struct sock *sk, int level, int optname,
1069 char *optval, int *optlen)
1071 struct udp_opt *up = udp_sk(sk);
1074 if (level != SOL_UDP)
1075 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1077 if(get_user(len,optlen))
1080 len = min_t(unsigned int, len, sizeof(int));
1091 val = up->encap_type;
1095 return -ENOPROTOOPT;
1098 if(put_user(len, optlen))
1100 if(copy_to_user(optval, &val,len))
1105 static struct inet6_protocol udpv6_protocol = {
1106 .handler = udpv6_rcv,
1107 .err_handler = udpv6_err,
1108 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1111 /* ------------------------------------------------------------------------ */
1112 #ifdef CONFIG_PROC_FS
1114 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1116 struct inet_opt *inet = inet_sk(sp);
1117 struct ipv6_pinfo *np = inet6_sk(sp);
1118 struct in6_addr *dest, *src;
1122 src = &np->rcv_saddr;
1123 destp = ntohs(inet->dport);
1124 srcp = ntohs(inet->sport);
1126 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1127 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
1129 src->s6_addr32[0], src->s6_addr32[1],
1130 src->s6_addr32[2], src->s6_addr32[3], srcp,
1131 dest->s6_addr32[0], dest->s6_addr32[1],
1132 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1134 atomic_read(&sp->sk_wmem_alloc),
1135 atomic_read(&sp->sk_rmem_alloc),
1139 atomic_read(&sp->sk_refcnt), sp);
1142 static int udp6_seq_show(struct seq_file *seq, void *v)
1144 if (v == SEQ_START_TOKEN)
1149 "st tx_queue rx_queue tr tm->when retrnsmt"
1150 " uid timeout inode\n");
1152 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1156 static struct file_operations udp6_seq_fops;
1157 static struct udp_seq_afinfo udp6_seq_afinfo = {
1158 .owner = THIS_MODULE,
1161 .seq_show = udp6_seq_show,
1162 .seq_fops = &udp6_seq_fops,
1165 int __init udp6_proc_init(void)
1167 return udp_proc_register(&udp6_seq_afinfo);
1170 void udp6_proc_exit(void) {
1171 udp_proc_unregister(&udp6_seq_afinfo);
1173 #endif /* CONFIG_PROC_FS */
1175 /* ------------------------------------------------------------------------ */
1177 struct proto udpv6_prot = {
1179 .close = udpv6_close,
1180 .connect = udpv6_connect,
1181 .disconnect = udp_disconnect,
1183 .destroy = udpv6_destroy_sock,
1184 .setsockopt = udpv6_setsockopt,
1185 .getsockopt = udpv6_getsockopt,
1186 .sendmsg = udpv6_sendmsg,
1187 .recvmsg = udpv6_recvmsg,
1188 .backlog_rcv = udpv6_queue_rcv_skb,
1189 .hash = udp_v6_hash,
1190 .unhash = udp_v6_unhash,
1191 .get_port = udp_v6_get_port,
1194 extern struct proto_ops inet6_dgram_ops;
1196 static struct inet_protosw udpv6_protosw = {
1198 .protocol = IPPROTO_UDP,
1199 .prot = &udpv6_prot,
1200 .ops = &inet6_dgram_ops,
1202 .no_check = UDP_CSUM_DEFAULT,
1203 .flags = INET_PROTOSW_PERMANENT,
1207 void __init udpv6_init(void)
1209 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1210 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1211 inet6_register_protosw(&udpv6_protosw);