net/ipv6/udp.c

   1 /*
   2  *      UDP over IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/ipv4/udp.c
   9  *
  10  *      $Id: udp.c,v 1.65 2002/02/01 22:01:04 davem Exp $
  11  *
  12  *      Fixes:
  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.
  19  *
  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.
  24  */
  25
  26 #include <linux/errno.h>
  27 #include <linux/types.h>
  28 #include <linux/socket.h>
  29 #include <linux/sockios.h>
  30 #include <linux/sched.h>
  31 #include <linux/net.h>
  32 #include <linux/in6.h>
  33 #include <linux/netdevice.h>
  34 #include <linux/if_arp.h>
  35 #include <linux/ipv6.h>
  36 #include <linux/icmpv6.h>
  37 #include <linux/init.h>
  38 #include <linux/skbuff.h>
  39 #include <asm/uaccess.h>
  40
  41 #include <net/sock.h>
  42 #include <net/snmp.h>
  43
  44 #include <net/ipv6.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>
  50 #include <net/ip.h>
  51 #include <net/udp.h>
  52 #include <net/raw.h>
  53 #include <net/inet_common.h>
  54 #include <net/tcp_states.h>
  55
  56 #include <net/ip6_checksum.h>
  57 #include <net/xfrm.h>
  58
  59 #include <linux/proc_fs.h>
  60 #include <linux/seq_file.h>
  61
  62 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
  63
  64 /* Grrr, addr_type already calculated by caller, but I don't want
  65  * to add some silly "cookie" argument to this method just for that.
  66  */
  67 static int udp_v6_get_port(struct sock *sk, unsigned short snum)
  68 {
  69         struct sock *sk2;
  70         struct hlist_node *node;
  71
  72         write_lock_bh(&udp_hash_lock);
  73         if (snum == 0) {
  74                 int best_size_so_far, best, result, i;
  75
  76                 if (udp_port_rover > sysctl_local_port_range[1] ||
  77                     udp_port_rover < sysctl_local_port_range[0])
  78                         udp_port_rover = sysctl_local_port_range[0];
  79                 best_size_so_far = 32767;
  80                 best = result = udp_port_rover;
  81                 for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) {
  82                         int size;
  83                         struct hlist_head *list;
  84
  85                         list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)];
  86                         if (hlist_empty(list)) {
  87                                 if (result > sysctl_local_port_range[1])
  88                                         result = sysctl_local_port_range[0] +
  89                                                 ((result - sysctl_local_port_range[0]) &
  90                                                  (UDP_HTABLE_SIZE - 1));
  91                                 goto gotit;
  92                         }
  93                         size = 0;
  94                         sk_for_each(sk2, node, list)
  95                                 if (++size >= best_size_so_far)
  96                                         goto next;
  97                         best_size_so_far = size;
  98                         best = result;
  99                 next:;
 100                 }
 101                 result = best;
 102                 for(i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++, result += UDP_HTABLE_SIZE) {
 103                         if (result > sysctl_local_port_range[1])
 104                                 result = sysctl_local_port_range[0]
 105                                         + ((result - sysctl_local_port_range[0]) &
 106                                            (UDP_HTABLE_SIZE - 1));
 107                         if (!udp_lport_inuse(result))
 108                                 break;
 109                 }
 110                 if (i >= (1 << 16) / UDP_HTABLE_SIZE)
 111                         goto fail;
 112 gotit:
 113                 udp_port_rover = snum = result;
 114         } else {
 115                 sk_for_each(sk2, node,
 116                             &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) {
 117                         if (inet_sk(sk2)->num == snum &&
 118                             sk2 != sk &&
 119                             (!sk2->sk_bound_dev_if ||
 120                              !sk->sk_bound_dev_if ||
 121                              sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
 122                             (!sk2->sk_reuse || !sk->sk_reuse) &&
 123                             ipv6_rcv_saddr_equal(sk, sk2))
 124                                 goto fail;
 125                 }
 126         }
 127
 128         inet_sk(sk)->num = snum;
 129         if (sk_unhashed(sk)) {
 130                 sk_add_node(sk, &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]);
 131                 sock_prot_inc_use(sk->sk_prot);
 132         }
 133         write_unlock_bh(&udp_hash_lock);
 134         return 0;
 135
 136 fail:
 137         write_unlock_bh(&udp_hash_lock);
 138         return 1;
 139 }
 140
 141 static void udp_v6_hash(struct sock *sk)
 142 {
 143         BUG();
 144 }
 145
 146 static void udp_v6_unhash(struct sock *sk)
 147 {
 148         write_lock_bh(&udp_hash_lock);
 149         if (sk_del_node_init(sk)) {
 150                 inet_sk(sk)->num = 0;
 151                 sock_prot_dec_use(sk->sk_prot);
 152         }
 153         write_unlock_bh(&udp_hash_lock);
 154 }
 155
 156 static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport,
 157                                   struct in6_addr *daddr, u16 dport, int dif)
 158 {
 159         struct sock *sk, *result = NULL;
 160         struct hlist_node *node;
 161         unsigned short hnum = ntohs(dport);
 162         int badness = -1;
 163
 164         read_lock(&udp_hash_lock);
 165         sk_for_each(sk, node, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) {
 166                 struct inet_sock *inet = inet_sk(sk);
 167
 168                 if (inet->num == hnum && sk->sk_family == PF_INET6) {
 169                         struct ipv6_pinfo *np = inet6_sk(sk);
 170                         int score = 0;
 171                         if (inet->dport) {
 172                                 if (inet->dport != sport)
 173                                         continue;
 174                                 score++;
 175                         }
 176                         if (!ipv6_addr_any(&np->rcv_saddr)) {
 177                                 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
 178                                         continue;
 179                                 score++;
 180                         }
 181                         if (!ipv6_addr_any(&np->daddr)) {
 182                                 if (!ipv6_addr_equal(&np->daddr, saddr))
 183                                         continue;
 184                                 score++;
 185                         }
 186                         if (sk->sk_bound_dev_if) {
 187                                 if (sk->sk_bound_dev_if != dif)
 188                                         continue;
 189                                 score++;
 190                         }
 191                         if(score == 4) {
 192                                 result = sk;
 193                                 break;
 194                         } else if(score > badness) {
 195                                 result = sk;
 196                                 badness = score;
 197                         }
 198                 }
 199         }
 200         if (result)
 201                 sock_hold(result);
 202         read_unlock(&udp_hash_lock);
 203         return result;
 204 }
 205
 206 /*
 207  *
 208  */
 209
 210 static void udpv6_close(struct sock *sk, long timeout)
 211 {
 212         sk_common_release(sk);
 213 }
 214
 215 /*
 216  *      This should be easy, if there is something there we
 217  *      return it, otherwise we block.
 218  */
 219
 220 static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
 221                   struct msghdr *msg, size_t len,
 222                   int noblock, int flags, int *addr_len)
 223 {
 224         struct ipv6_pinfo *np = inet6_sk(sk);
 225         struct inet_sock *inet = inet_sk(sk);
 226         struct sk_buff *skb;
 227         size_t copied;
 228         int err;
 229
 230         if (addr_len)
 231                 *addr_len=sizeof(struct sockaddr_in6);
 232
 233         if (flags & MSG_ERRQUEUE)
 234                 return ipv6_recv_error(sk, msg, len);
 235
 236 try_again:
 237         skb = skb_recv_datagram(sk, flags, noblock, &err);
 238         if (!skb)
 239                 goto out;
 240
 241         copied = skb->len - sizeof(struct udphdr);
 242         if (copied > len) {
 243                 copied = len;
 244                 msg->msg_flags |= MSG_TRUNC;
 245         }
 246
 247         if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
 248                 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
 249                                               copied);
 250         } else if (msg->msg_flags&MSG_TRUNC) {
 251                 if (__skb_checksum_complete(skb))
 252                         goto csum_copy_err;
 253                 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
 254                                               copied);
 255         } else {
 256                 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
 257                 if (err == -EINVAL)
 258                         goto csum_copy_err;
 259         }
 260         if (err)
 261                 goto out_free;
 262
 263         sock_recv_timestamp(msg, sk, skb);
 264
 265         /* Copy the address. */
 266         if (msg->msg_name) {
 267                 struct sockaddr_in6 *sin6;
 268
 269                 sin6 = (struct sockaddr_in6 *) msg->msg_name;
 270                 sin6->sin6_family = AF_INET6;
 271                 sin6->sin6_port = skb->h.uh->source;
 272                 sin6->sin6_flowinfo = 0;
 273                 sin6->sin6_scope_id = 0;
 274
 275                 if (skb->protocol == htons(ETH_P_IP))
 276                         ipv6_addr_set(&sin6->sin6_addr, 0, 0,
 277                                       htonl(0xffff), skb->nh.iph->saddr);
 278                 else {
 279                         ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
 280                         if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 281                                 sin6->sin6_scope_id = IP6CB(skb)->iif;
 282                 }
 283
 284         }
 285         if (skb->protocol == htons(ETH_P_IP)) {
 286                 if (inet->cmsg_flags)
 287                         ip_cmsg_recv(msg, skb);
 288         } else {
 289                 if (np->rxopt.all)
 290                         datagram_recv_ctl(sk, msg, skb);
 291         }
 292
 293         err = copied;
 294         if (flags & MSG_TRUNC)
 295                 err = skb->len - sizeof(struct udphdr);
 296
 297 out_free:
 298         skb_free_datagram(sk, skb);
 299 out:
 300         return err;
 301
 302 csum_copy_err:
 303         skb_kill_datagram(sk, skb, flags);
 304
 305         if (flags & MSG_DONTWAIT) {
 306                 UDP6_INC_STATS_USER(UDP_MIB_INERRORS);
 307                 return -EAGAIN;
 308         }
 309         goto try_again;
 310 }
 311
 312 static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 313                int type, int code, int offset, __u32 info)
 314 {
 315         struct ipv6_pinfo *np;
 316         struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
 317         struct in6_addr *saddr = &hdr->saddr;
 318         struct in6_addr *daddr = &hdr->daddr;
 319         struct udphdr *uh = (struct udphdr*)(skb->data+offset);
 320         struct sock *sk;
 321         int err;
 322
 323         sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, inet6_iif(skb));
 324
 325         if (sk == NULL)
 326                 return;
 327
 328         np = inet6_sk(sk);
 329
 330         if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
 331                 goto out;
 332
 333         if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
 334                 goto out;
 335
 336         if (np->recverr)
 337                 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
 338
 339         sk->sk_err = err;
 340         sk->sk_error_report(sk);
 341 out:
 342         sock_put(sk);
 343 }
 344
 345 static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
 346 {
 347         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
 348                 kfree_skb(skb);
 349                 return -1;
 350         }
 351
 352         if (skb_checksum_complete(skb)) {
 353                 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
 354                 kfree_skb(skb);
 355                 return 0;
 356         }
 357
 358         if (sock_queue_rcv_skb(sk,skb)<0) {
 359                 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
 360                 kfree_skb(skb);
 361                 return 0;
 362         }
 363         UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
 364         return 0;
 365 }
 366
 367 static struct sock *udp_v6_mcast_next(struct sock *sk,
 368                                       u16 loc_port, struct in6_addr *loc_addr,
 369                                       u16 rmt_port, struct in6_addr *rmt_addr,
 370                                       int dif)
 371 {
 372         struct hlist_node *node;
 373         struct sock *s = sk;
 374         unsigned short num = ntohs(loc_port);
 375
 376         sk_for_each_from(s, node) {
 377                 struct inet_sock *inet = inet_sk(s);
 378
 379                 if (inet->num == num && s->sk_family == PF_INET6) {
 380                         struct ipv6_pinfo *np = inet6_sk(s);
 381                         if (inet->dport) {
 382                                 if (inet->dport != rmt_port)
 383                                         continue;
 384                         }
 385                         if (!ipv6_addr_any(&np->daddr) &&
 386                             !ipv6_addr_equal(&np->daddr, rmt_addr))
 387                                 continue;
 388
 389                         if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
 390                                 continue;
 391
 392                         if (!ipv6_addr_any(&np->rcv_saddr)) {
 393                                 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
 394                                         continue;
 395                         }
 396                         if(!inet6_mc_check(s, loc_addr, rmt_addr))
 397                                 continue;
 398                         return s;
 399                 }
 400         }
 401         return NULL;
 402 }
 403
 404 /*
 405  * Note: called only from the BH handler context,
 406  * so we don't need to lock the hashes.
 407  */
 408 static void udpv6_mcast_deliver(struct udphdr *uh,
 409                                 struct in6_addr *saddr, struct in6_addr *daddr,
 410                                 struct sk_buff *skb)
 411 {
 412         struct sock *sk, *sk2;
 413         int dif;
 414
 415         read_lock(&udp_hash_lock);
 416         sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
 417         dif = inet6_iif(skb);
 418         sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
 419         if (!sk) {
 420                 kfree_skb(skb);
 421                 goto out;
 422         }
 423
 424         sk2 = sk;
 425         while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
 426                                         uh->source, saddr, dif))) {
 427                 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
 428                 if (buff)
 429                         udpv6_queue_rcv_skb(sk2, buff);
 430         }
 431         udpv6_queue_rcv_skb(sk, skb);
 432 out:
 433         read_unlock(&udp_hash_lock);
 434 }
 435
 436 static int udpv6_rcv(struct sk_buff **pskb)
 437 {
 438         struct sk_buff *skb = *pskb;
 439         struct sock *sk;
 440         struct udphdr *uh;
 441         struct net_device *dev = skb->dev;
 442         struct in6_addr *saddr, *daddr;
 443         u32 ulen = 0;
 444
 445         if (!pskb_may_pull(skb, sizeof(struct udphdr)))
 446                 goto short_packet;
 447
 448         saddr = &skb->nh.ipv6h->saddr;
 449         daddr = &skb->nh.ipv6h->daddr;
 450         uh = skb->h.uh;
 451
 452         ulen = ntohs(uh->len);
 453
 454         /* Check for jumbo payload */
 455         if (ulen == 0)
 456                 ulen = skb->len;
 457
 458         if (ulen > skb->len || ulen < sizeof(*uh))
 459                 goto short_packet;
 460
 461         if (uh->check == 0) {
 462                 /* RFC 2460 section 8.1 says that we SHOULD log
 463                    this error. Well, it is reasonable.
 464                  */
 465                 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
 466                 goto discard;
 467         }
 468
 469         if (ulen < skb->len) {
 470                 if (pskb_trim_rcsum(skb, ulen))
 471                         goto discard;
 472                 saddr = &skb->nh.ipv6h->saddr;
 473                 daddr = &skb->nh.ipv6h->daddr;
 474                 uh = skb->h.uh;
 475         }
 476
 477         if (skb->ip_summed == CHECKSUM_HW &&
 478             !csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum))
 479                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 480
 481         if (skb->ip_summed != CHECKSUM_UNNECESSARY)
 482                 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
 483
 484         /*
 485          *      Multicast receive code
 486          */
 487         if (ipv6_addr_is_multicast(daddr)) {
 488                 udpv6_mcast_deliver(uh, saddr, daddr, skb);
 489                 return 0;
 490         }
 491
 492         /* Unicast */
 493
 494         /*
 495          * check socket cache ... must talk to Alan about his plans
 496          * for sock caches... i'll skip this for now.
 497          */
 498         sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, inet6_iif(skb));
 499
 500         if (sk == NULL) {
 501                 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 502                         goto discard;
 503
 504                 if (skb_checksum_complete(skb))
 505                         goto discard;
 506                 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);
 507
 508                 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
 509
 510                 kfree_skb(skb);
 511                 return(0);
 512         }
 513
 514         /* deliver */
 515
 516         udpv6_queue_rcv_skb(sk, skb);
 517         sock_put(sk);
 518         return(0);
 519
 520 short_packet:
 521         if (net_ratelimit())
 522                 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
 523
 524 discard:
 525         UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
 526         kfree_skb(skb);
 527         return(0);
 528 }
 529 /*
 530  * Throw away all pending data and cancel the corking. Socket is locked.
 531  */
 532 static void udp_v6_flush_pending_frames(struct sock *sk)
 533 {
 534         struct udp_sock *up = udp_sk(sk);
 535
 536         if (up->pending) {
 537                 up->len = 0;
 538                 up->pending = 0;
 539                 ip6_flush_pending_frames(sk);
 540         }
 541 }
 542
 543 /*
 544  *      Sending
 545  */
 546
 547 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
 548 {
 549         struct sk_buff *skb;
 550         struct udphdr *uh;
 551         struct inet_sock *inet = inet_sk(sk);
 552         struct flowi *fl = &inet->cork.fl;
 553         int err = 0;
 554
 555         /* Grab the skbuff where UDP header space exists. */
 556         if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
 557                 goto out;
 558
 559         /*
 560          * Create a UDP header
 561          */
 562         uh = skb->h.uh;
 563         uh->source = fl->fl_ip_sport;
 564         uh->dest = fl->fl_ip_dport;
 565         uh->len = htons(up->len);
 566         uh->check = 0;
 567
 568         if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
 569                 skb->ip_summed = CHECKSUM_NONE;
 570                 goto send;
 571         }
 572
 573         if (skb_queue_len(&sk->sk_write_queue) == 1) {
 574                 skb->csum = csum_partial((char *)uh,
 575                                 sizeof(struct udphdr), skb->csum);
 576                 uh->check = csum_ipv6_magic(&fl->fl6_src,
 577                                             &fl->fl6_dst,
 578                                             up->len, fl->proto, skb->csum);
 579         } else {
 580                 u32 tmp_csum = 0;
 581
 582                 skb_queue_walk(&sk->sk_write_queue, skb) {
 583                         tmp_csum = csum_add(tmp_csum, skb->csum);
 584                 }
 585                 tmp_csum = csum_partial((char *)uh,
 586                                 sizeof(struct udphdr), tmp_csum);
 587                 tmp_csum = csum_ipv6_magic(&fl->fl6_src,
 588                                            &fl->fl6_dst,
 589                                            up->len, fl->proto, tmp_csum);
 590                 uh->check = tmp_csum;
 591
 592         }
 593         if (uh->check == 0)
 594                 uh->check = -1;
 595
 596 send:
 597         err = ip6_push_pending_frames(sk);
 598 out:
 599         up->len = 0;
 600         up->pending = 0;
 601         return err;
 602 }
 603
 604 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
 605                   struct msghdr *msg, size_t len)
 606 {
 607         struct ipv6_txoptions opt_space;
 608         struct udp_sock *up = udp_sk(sk);
 609         struct inet_sock *inet = inet_sk(sk);
 610         struct ipv6_pinfo *np = inet6_sk(sk);
 611         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
 612         struct in6_addr *daddr, *final_p = NULL, final;
 613         struct ipv6_txoptions *opt = NULL;
 614         struct ip6_flowlabel *flowlabel = NULL;
 615         struct flowi *fl = &inet->cork.fl;
 616         struct dst_entry *dst;
 617         int addr_len = msg->msg_namelen;
 618         int ulen = len;
 619         int hlimit = -1;
 620         int tclass = -1;
 621         int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
 622         int err;
 623         int connected = 0;
 624
 625         /* destination address check */
 626         if (sin6) {
 627                 if (addr_len < offsetof(struct sockaddr, sa_data))
 628                         return -EINVAL;
 629
 630                 switch (sin6->sin6_family) {
 631                 case AF_INET6:
 632                         if (addr_len < SIN6_LEN_RFC2133)
 633                                 return -EINVAL;
 634                         daddr = &sin6->sin6_addr;
 635                         break;
 636                 case AF_INET:
 637                         goto do_udp_sendmsg;
 638                 case AF_UNSPEC:
 639                         msg->msg_name = sin6 = NULL;
 640                         msg->msg_namelen = addr_len = 0;
 641                         daddr = NULL;
 642                         break;
 643                 default:
 644                         return -EINVAL;
 645                 }
 646         } else if (!up->pending) {
 647                 if (sk->sk_state != TCP_ESTABLISHED)
 648                         return -EDESTADDRREQ;
 649                 daddr = &np->daddr;
 650         } else
 651                 daddr = NULL;
 652
 653         if (daddr) {
 654                 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
 655                         struct sockaddr_in sin;
 656                         sin.sin_family = AF_INET;
 657                         sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
 658                         sin.sin_addr.s_addr = daddr->s6_addr32[3];
 659                         msg->msg_name = &sin;
 660                         msg->msg_namelen = sizeof(sin);
 661 do_udp_sendmsg:
 662                         if (__ipv6_only_sock(sk))
 663                                 return -ENETUNREACH;
 664                         return udp_sendmsg(iocb, sk, msg, len);
 665                 }
 666         }
 667
 668         if (up->pending == AF_INET)
 669                 return udp_sendmsg(iocb, sk, msg, len);
 670
 671         /* Rough check on arithmetic overflow,
 672            better check is made in ip6_build_xmit
 673            */
 674         if (len > INT_MAX - sizeof(struct udphdr))
 675                 return -EMSGSIZE;
 676
 677         if (up->pending) {
 678                 /*
 679                  * There are pending frames.
 680                  * The socket lock must be held while it's corked.
 681                  */
 682                 lock_sock(sk);
 683                 if (likely(up->pending)) {
 684                         if (unlikely(up->pending != AF_INET6)) {
 685                                 release_sock(sk);
 686                                 return -EAFNOSUPPORT;
 687                         }
 688                         dst = NULL;
 689                         goto do_append_data;
 690                 }
 691                 release_sock(sk);
 692         }
 693         ulen += sizeof(struct udphdr);
 694
 695         memset(fl, 0, sizeof(*fl));
 696
 697         if (sin6) {
 698                 if (sin6->sin6_port == 0)
 699                         return -EINVAL;
 700
 701                 fl->fl_ip_dport = sin6->sin6_port;
 702                 daddr = &sin6->sin6_addr;
 703
 704                 if (np->sndflow) {
 705                         fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
 706                         if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
 707                                 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
 708                                 if (flowlabel == NULL)
 709                                         return -EINVAL;
 710                                 daddr = &flowlabel->dst;
 711                         }
 712                 }
 713
 714                 /*
 715                  * Otherwise it will be difficult to maintain
 716                  * sk->sk_dst_cache.
 717                  */
 718                 if (sk->sk_state == TCP_ESTABLISHED &&
 719                     ipv6_addr_equal(daddr, &np->daddr))
 720                         daddr = &np->daddr;
 721
 722                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 723                     sin6->sin6_scope_id &&
 724                     ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
 725                         fl->oif = sin6->sin6_scope_id;
 726         } else {
 727                 if (sk->sk_state != TCP_ESTABLISHED)
 728                         return -EDESTADDRREQ;
 729
 730                 fl->fl_ip_dport = inet->dport;
 731                 daddr = &np->daddr;
 732                 fl->fl6_flowlabel = np->flow_label;
 733                 connected = 1;
 734         }
 735
 736         if (!fl->oif)
 737                 fl->oif = sk->sk_bound_dev_if;
 738
 739         if (msg->msg_controllen) {
 740                 opt = &opt_space;
 741                 memset(opt, 0, sizeof(struct ipv6_txoptions));
 742                 opt->tot_len = sizeof(*opt);
 743
 744                 err = datagram_send_ctl(msg, fl, opt, &hlimit, &tclass);
 745                 if (err < 0) {
 746                         fl6_sock_release(flowlabel);
 747                         return err;
 748                 }
 749                 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
 750                         flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
 751                         if (flowlabel == NULL)
 752                                 return -EINVAL;
 753                 }
 754                 if (!(opt->opt_nflen|opt->opt_flen))
 755                         opt = NULL;
 756                 connected = 0;
 757         }
 758         if (opt == NULL)
 759                 opt = np->opt;
 760         if (flowlabel)
 761                 opt = fl6_merge_options(&opt_space, flowlabel, opt);
 762         opt = ipv6_fixup_options(&opt_space, opt);
 763
 764         fl->proto = IPPROTO_UDP;
 765         ipv6_addr_copy(&fl->fl6_dst, daddr);
 766         if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
 767                 ipv6_addr_copy(&fl->fl6_src, &np->saddr);
 768         fl->fl_ip_sport = inet->sport;
 769
 770         /* merge ip6_build_xmit from ip6_output */
 771         if (opt && opt->srcrt) {
 772                 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
 773                 ipv6_addr_copy(&final, &fl->fl6_dst);
 774                 ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
 775                 final_p = &final;
 776                 connected = 0;
 777         }
 778
 779         if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst)) {
 780                 fl->oif = np->mcast_oif;
 781                 connected = 0;
 782         }
 783
 784         err = ip6_sk_dst_lookup(sk, &dst, fl);
 785         if (err)
 786                 goto out;
 787         if (final_p)
 788                 ipv6_addr_copy(&fl->fl6_dst, final_p);
 789
 790         if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0)
 791                 goto out;
 792
 793         if (hlimit < 0) {
 794                 if (ipv6_addr_is_multicast(&fl->fl6_dst))
 795                         hlimit = np->mcast_hops;
 796                 else
 797                         hlimit = np->hop_limit;
 798                 if (hlimit < 0)
 799                         hlimit = dst_metric(dst, RTAX_HOPLIMIT);
 800                 if (hlimit < 0)
 801                         hlimit = ipv6_get_hoplimit(dst->dev);
 802         }
 803
 804         if (tclass < 0) {
 805                 tclass = np->tclass;
 806                 if (tclass < 0)
 807                         tclass = 0;
 808         }
 809
 810         if (msg->msg_flags&MSG_CONFIRM)
 811                 goto do_confirm;
 812 back_from_confirm:
 813
 814         lock_sock(sk);
 815         if (unlikely(up->pending)) {
 816                 /* The socket is already corked while preparing it. */
 817                 /* ... which is an evident application bug. --ANK */
 818                 release_sock(sk);
 819
 820                 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
 821                 err = -EINVAL;
 822                 goto out;
 823         }
 824
 825         up->pending = AF_INET6;
 826
 827 do_append_data:
 828         up->len += ulen;
 829         err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen,
 830                 sizeof(struct udphdr), hlimit, tclass, opt, fl,
 831                 (struct rt6_info*)dst,
 832                 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
 833         if (err)
 834                 udp_v6_flush_pending_frames(sk);
 835         else if (!corkreq)
 836                 err = udp_v6_push_pending_frames(sk, up);
 837
 838         if (dst) {
 839                 if (connected) {
 840                         ip6_dst_store(sk, dst,
 841                                       ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ?
 842                                       &np->daddr : NULL);
 843                 } else {
 844                         dst_release(dst);
 845                 }
 846         }
 847
 848         if (err > 0)
 849                 err = np->recverr ? net_xmit_errno(err) : 0;
 850         release_sock(sk);
 851 out:
 852         fl6_sock_release(flowlabel);
 853         if (!err) {
 854                 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS);
 855                 return len;
 856         }
 857         return err;
 858
 859 do_confirm:
 860         dst_confirm(dst);
 861         if (!(msg->msg_flags&MSG_PROBE) || len)
 862                 goto back_from_confirm;
 863         err = 0;
 864         goto out;
 865 }
 866
 867 static int udpv6_destroy_sock(struct sock *sk)
 868 {
 869         lock_sock(sk);
 870         udp_v6_flush_pending_frames(sk);
 871         release_sock(sk);
 872
 873         inet6_destroy_sock(sk);
 874
 875         return 0;
 876 }
 877
 878 /*
 879  *      Socket option code for UDP
 880  */
 881 static int do_udpv6_setsockopt(struct sock *sk, int level, int optname,
 882                           char __user *optval, int optlen)
 883 {
 884         struct udp_sock *up = udp_sk(sk);
 885         int val;
 886         int err = 0;
 887
 888         if(optlen<sizeof(int))
 889                 return -EINVAL;
 890
 891         if (get_user(val, (int __user *)optval))
 892                 return -EFAULT;
 893
 894         switch(optname) {
 895         case UDP_CORK:
 896                 if (val != 0) {
 897                         up->corkflag = 1;
 898                 } else {
 899                         up->corkflag = 0;
 900                         lock_sock(sk);
 901                         udp_v6_push_pending_frames(sk, up);
 902                         release_sock(sk);
 903                 }
 904                 break;
 905
 906         case UDP_ENCAP:
 907                 switch (val) {
 908                 case 0:
 909                         up->encap_type = val;
 910                         break;
 911                 default:
 912                         err = -ENOPROTOOPT;
 913                         break;
 914                 }
 915                 break;
 916
 917         default:
 918                 err = -ENOPROTOOPT;
 919                 break;
 920         };
 921
 922         return err;
 923 }
 924
 925 static int udpv6_setsockopt(struct sock *sk, int level, int optname,
 926                           char __user *optval, int optlen)
 927 {
 928         if (level != SOL_UDP)
 929                 return ipv6_setsockopt(sk, level, optname, optval, optlen);
 930         return do_udpv6_setsockopt(sk, level, optname, optval, optlen);
 931 }
 932
 933 #ifdef CONFIG_COMPAT
 934 static int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
 935                                    char __user *optval, int optlen)
 936 {
 937         if (level != SOL_UDP)
 938                 return compat_ipv6_setsockopt(sk, level, optname,
 939                                               optval, optlen);
 940         return do_udpv6_setsockopt(sk, level, optname, optval, optlen);
 941 }
 942 #endif
 943
 944 static int do_udpv6_getsockopt(struct sock *sk, int level, int optname,
 945                           char __user *optval, int __user *optlen)
 946 {
 947         struct udp_sock *up = udp_sk(sk);
 948         int val, len;
 949
 950         if(get_user(len,optlen))
 951                 return -EFAULT;
 952
 953         len = min_t(unsigned int, len, sizeof(int));
 954
 955         if(len < 0)
 956                 return -EINVAL;
 957
 958         switch(optname) {
 959         case UDP_CORK:
 960                 val = up->corkflag;
 961                 break;
 962
 963         case UDP_ENCAP:
 964                 val = up->encap_type;
 965                 break;
 966
 967         default:
 968                 return -ENOPROTOOPT;
 969         };
 970
 971         if(put_user(len, optlen))
 972                 return -EFAULT;
 973         if(copy_to_user(optval, &val,len))
 974                 return -EFAULT;
 975         return 0;
 976 }
 977
 978 static int udpv6_getsockopt(struct sock *sk, int level, int optname,
 979                           char __user *optval, int __user *optlen)
 980 {
 981         if (level != SOL_UDP)
 982                 return ipv6_getsockopt(sk, level, optname, optval, optlen);
 983         return do_udpv6_getsockopt(sk, level, optname, optval, optlen);
 984 }
 985
 986 #ifdef CONFIG_COMPAT
 987 static int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
 988                                    char __user *optval, int __user *optlen)
 989 {
 990         if (level != SOL_UDP)
 991                 return compat_ipv6_getsockopt(sk, level, optname,
 992                                               optval, optlen);
 993         return do_udpv6_getsockopt(sk, level, optname, optval, optlen);
 994 }
 995 #endif
 996
 997 static struct inet6_protocol udpv6_protocol = {
 998         .handler        =       udpv6_rcv,
 999         .err_handler    =       udpv6_err,
1000         .flags          =       INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1001 };
1002
1003 /* ------------------------------------------------------------------------ */
1004 #ifdef CONFIG_PROC_FS
1005
1006 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1007 {
1008         struct inet_sock *inet = inet_sk(sp);
1009         struct ipv6_pinfo *np = inet6_sk(sp);
1010         struct in6_addr *dest, *src;
1011         __u16 destp, srcp;
1012
1013         dest  = &np->daddr;
1014         src   = &np->rcv_saddr;
1015         destp = ntohs(inet->dport);
1016         srcp  = ntohs(inet->sport);
1017         seq_printf(seq,
1018                    "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1019                    "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
1020                    bucket,
1021                    src->s6_addr32[0], src->s6_addr32[1],
1022                    src->s6_addr32[2], src->s6_addr32[3], srcp,
1023                    dest->s6_addr32[0], dest->s6_addr32[1],
1024                    dest->s6_addr32[2], dest->s6_addr32[3], destp,
1025                    sp->sk_state,
1026                    atomic_read(&sp->sk_wmem_alloc),
1027                    atomic_read(&sp->sk_rmem_alloc),
1028                    0, 0L, 0,
1029                    sock_i_uid(sp), 0,
1030                    sock_i_ino(sp),
1031                    atomic_read(&sp->sk_refcnt), sp);
1032 }
1033
1034 static int udp6_seq_show(struct seq_file *seq, void *v)
1035 {
1036         if (v == SEQ_START_TOKEN)
1037                 seq_printf(seq,
1038                            "  sl  "
1039                            "local_address                         "
1040                            "remote_address                        "
1041                            "st tx_queue rx_queue tr tm->when retrnsmt"
1042                            "   uid  timeout inode\n");
1043         else
1044                 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1045         return 0;
1046 }
1047
1048 static struct file_operations udp6_seq_fops;
1049 static struct udp_seq_afinfo udp6_seq_afinfo = {
1050         .owner          = THIS_MODULE,
1051         .name           = "udp6",
1052         .family         = AF_INET6,
1053         .seq_show       = udp6_seq_show,
1054         .seq_fops       = &udp6_seq_fops,
1055 };
1056
1057 int __init udp6_proc_init(void)
1058 {
1059         return udp_proc_register(&udp6_seq_afinfo);
1060 }
1061
1062 void udp6_proc_exit(void) {
1063         udp_proc_unregister(&udp6_seq_afinfo);
1064 }
1065 #endif /* CONFIG_PROC_FS */
1066
1067 /* ------------------------------------------------------------------------ */
1068
1069 struct proto udpv6_prot = {
1070         .name              = "UDPv6",
1071         .owner             = THIS_MODULE,
1072         .close             = udpv6_close,
1073         .connect           = ip6_datagram_connect,
1074         .disconnect        = udp_disconnect,
1075         .ioctl             = udp_ioctl,
1076         .destroy           = udpv6_destroy_sock,
1077         .setsockopt        = udpv6_setsockopt,
1078         .getsockopt        = udpv6_getsockopt,
1079         .sendmsg           = udpv6_sendmsg,
1080         .recvmsg           = udpv6_recvmsg,
1081         .backlog_rcv       = udpv6_queue_rcv_skb,
1082         .hash              = udp_v6_hash,
1083         .unhash            = udp_v6_unhash,
1084         .get_port          = udp_v6_get_port,
1085         .obj_size          = sizeof(struct udp6_sock),
1086 #ifdef CONFIG_COMPAT
1087         .compat_setsockopt = compat_udpv6_setsockopt,
1088         .compat_getsockopt = compat_udpv6_getsockopt,
1089 #endif
1090 };
1091
1092 static struct inet_protosw udpv6_protosw = {
1093         .type =      SOCK_DGRAM,
1094         .protocol =  IPPROTO_UDP,
1095         .prot =      &udpv6_prot,
1096         .ops =       &inet6_dgram_ops,
1097         .capability =-1,
1098         .no_check =  UDP_CSUM_DEFAULT,
1099         .flags =     INET_PROTOSW_PERMANENT,
1100 };
1101
1102
1103 void __init udpv6_init(void)
1104 {
1105         if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1106                 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1107         inet6_register_protosw(&udpv6_protosw);
1108 }