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/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>
  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
  55 #include <net/ip6_checksum.h>
  56 #include <net/xfrm.h>
  57
  58 #include <linux/proc_fs.h>
  59 #include <linux/seq_file.h>
  60
  61 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6);
  62
  63 /* Grrr, addr_type already calculated by caller, but I don't want
  64  * to add some silly "cookie" argument to this method just for that.
  65  */
  66 static int udp_v6_get_port(struct sock *sk, unsigned short snum)
  67 {
  68         struct sock *sk2;
  69         struct hlist_node *node;
  70
  71         write_lock_bh(&udp_hash_lock);
  72         if (snum == 0) {
  73                 int best_size_so_far, best, result, i;
  74
  75                 if (udp_port_rover > sysctl_local_port_range[1] ||
  76                     udp_port_rover < sysctl_local_port_range[0])
  77                         udp_port_rover = sysctl_local_port_range[0];
  78                 best_size_so_far = 32767;
  79                 best = result = udp_port_rover;
  80                 for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) {
  81                         int size;
  82                         struct hlist_head *list;
  83
  84                         list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)];
  85                         if (hlist_empty(list)) {
  86                                 if (result > sysctl_local_port_range[1])
  87                                         result = sysctl_local_port_range[0] +
  88                                                 ((result - sysctl_local_port_range[0]) &
  89                                                  (UDP_HTABLE_SIZE - 1));
  90                                 goto gotit;
  91                         }
  92                         size = 0;
  93                         sk_for_each(sk2, node, list)
  94                                 if (++size >= best_size_so_far)
  95                                         goto next;
  96                         best_size_so_far = size;
  97                         best = result;
  98                 next:;
  99                 }
 100                 result = best;
 101                 for(;; result += UDP_HTABLE_SIZE) {
 102                         if (result > sysctl_local_port_range[1])
 103                                 result = sysctl_local_port_range[0]
 104                                         + ((result - sysctl_local_port_range[0]) &
 105                                            (UDP_HTABLE_SIZE - 1));
 106                         if (!udp_lport_inuse(result))
 107                                 break;
 108                 }
 109 gotit:
 110                 udp_port_rover = snum = result;
 111         } else {
 112                 sk_for_each(sk2, node,
 113                             &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) {
 114                         if (inet_sk(sk2)->num == snum &&
 115                             sk2 != sk &&
 116                             (!sk2->sk_bound_dev_if ||
 117                              !sk->sk_bound_dev_if ||
 118                              sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
 119                             (!sk2->sk_reuse || !sk->sk_reuse) &&
 120                             ipv6_rcv_saddr_equal(sk, sk2))
 121                                 goto fail;
 122                 }
 123         }
 124
 125         inet_sk(sk)->num = snum;
 126         if (sk_unhashed(sk)) {
 127                 sk_add_node(sk, &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]);
 128                 sock_prot_inc_use(sk->sk_prot);
 129         }
 130         write_unlock_bh(&udp_hash_lock);
 131         return 0;
 132
 133 fail:
 134         write_unlock_bh(&udp_hash_lock);
 135         return 1;
 136 }
 137
 138 static void udp_v6_hash(struct sock *sk)
 139 {
 140         BUG();
 141 }
 142
 143 static void udp_v6_unhash(struct sock *sk)
 144 {
 145         write_lock_bh(&udp_hash_lock);
 146         if (sk_del_node_init(sk)) {
 147                 inet_sk(sk)->num = 0;
 148                 sock_prot_dec_use(sk->sk_prot);
 149         }
 150         write_unlock_bh(&udp_hash_lock);
 151 }
 152
 153 static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport,
 154                                   struct in6_addr *daddr, u16 dport, int dif)
 155 {
 156         struct sock *sk, *result = NULL;
 157         struct hlist_node *node;
 158         unsigned short hnum = ntohs(dport);
 159         int badness = -1;
 160
 161         read_lock(&udp_hash_lock);
 162         sk_for_each(sk, node, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) {
 163                 struct inet_opt *inet = inet_sk(sk);
 164
 165                 if (inet->num == hnum && sk->sk_family == PF_INET6) {
 166                         struct ipv6_pinfo *np = inet6_sk(sk);
 167                         int score = 0;
 168                         if (inet->dport) {
 169                                 if (inet->dport != sport)
 170                                         continue;
 171                                 score++;
 172                         }
 173                         if (!ipv6_addr_any(&np->rcv_saddr)) {
 174                                 if (ipv6_addr_cmp(&np->rcv_saddr, daddr))
 175                                         continue;
 176                                 score++;
 177                         }
 178                         if (!ipv6_addr_any(&np->daddr)) {
 179                                 if (ipv6_addr_cmp(&np->daddr, saddr))
 180                                         continue;
 181                                 score++;
 182                         }
 183                         if (sk->sk_bound_dev_if) {
 184                                 if (sk->sk_bound_dev_if != dif)
 185                                         continue;
 186                                 score++;
 187                         }
 188                         if(score == 4) {
 189                                 result = sk;
 190                                 break;
 191                         } else if(score > badness) {
 192                                 result = sk;
 193                                 badness = score;
 194                         }
 195                 }
 196         }
 197         if (result)
 198                 sock_hold(result);
 199         read_unlock(&udp_hash_lock);
 200         return result;
 201 }
 202
 203 /*
 204  *
 205  */
 206
 207 static void udpv6_close(struct sock *sk, long timeout)
 208 {
 209         sk_common_release(sk);
 210 }
 211
 212 /*
 213  *      This should be easy, if there is something there we
 214  *      return it, otherwise we block.
 215  */
 216
 217 static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
 218                   struct msghdr *msg, size_t len,
 219                   int noblock, int flags, int *addr_len)
 220 {
 221         struct ipv6_pinfo *np = inet6_sk(sk);
 222         struct sk_buff *skb;
 223         size_t copied;
 224         int err;
 225
 226         if (addr_len)
 227                 *addr_len=sizeof(struct sockaddr_in6);
 228
 229         if (flags & MSG_ERRQUEUE)
 230                 return ipv6_recv_error(sk, msg, len);
 231
 232 try_again:
 233         skb = skb_recv_datagram(sk, flags, noblock, &err);
 234         if (!skb)
 235                 goto out;
 236
 237         copied = skb->len - sizeof(struct udphdr);
 238         if (copied > len) {
 239                 copied = len;
 240                 msg->msg_flags |= MSG_TRUNC;
 241         }
 242
 243         if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
 244                 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
 245                                               copied);
 246         } else if (msg->msg_flags&MSG_TRUNC) {
 247                 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
 248                         goto csum_copy_err;
 249                 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
 250                                               copied);
 251         } else {
 252                 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
 253                 if (err == -EINVAL)
 254                         goto csum_copy_err;
 255         }
 256         if (err)
 257                 goto out_free;
 258
 259         sock_recv_timestamp(msg, sk, skb);
 260
 261         /* Copy the address. */
 262         if (msg->msg_name) {
 263                 struct sockaddr_in6 *sin6;
 264
 265                 sin6 = (struct sockaddr_in6 *) msg->msg_name;
 266                 sin6->sin6_family = AF_INET6;
 267                 sin6->sin6_port = skb->h.uh->source;
 268                 sin6->sin6_flowinfo = 0;
 269                 sin6->sin6_scope_id = 0;
 270
 271                 if (skb->protocol == htons(ETH_P_IP)) {
 272                         struct inet_opt *inet = inet_sk(sk);
 273
 274                         ipv6_addr_set(&sin6->sin6_addr, 0, 0,
 275                                       htonl(0xffff), skb->nh.iph->saddr);
 276                         if (inet->cmsg_flags)
 277                                 ip_cmsg_recv(msg, skb);
 278                 } else {
 279                         ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
 280
 281                         if (np->rxopt.all)
 282                                 datagram_recv_ctl(sk, msg, skb);
 283                         if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 284                                 sin6->sin6_scope_id = IP6CB(skb)->iif;
 285                 }
 286         }
 287
 288         err = copied;
 289         if (flags & MSG_TRUNC)
 290                 err = skb->len - sizeof(struct udphdr);
 291
 292 out_free:
 293         skb_free_datagram(sk, skb);
 294 out:
 295         return err;
 296
 297 csum_copy_err:
 298         /* Clear queue. */
 299         if (flags&MSG_PEEK) {
 300                 int clear = 0;
 301                 spin_lock_irq(&sk->sk_receive_queue.lock);
 302                 if (skb == skb_peek(&sk->sk_receive_queue)) {
 303                         __skb_unlink(skb, &sk->sk_receive_queue);
 304                         clear = 1;
 305                 }
 306                 spin_unlock_irq(&sk->sk_receive_queue.lock);
 307                 if (clear)
 308                         kfree_skb(skb);
 309         }
 310
 311         skb_free_datagram(sk, skb);
 312
 313         if (flags & MSG_DONTWAIT) {
 314                 UDP6_INC_STATS_USER(UDP_MIB_INERRORS);
 315                 return -EAGAIN;
 316         }
 317         goto try_again;
 318 }
 319
 320 static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 321                int type, int code, int offset, __u32 info)
 322 {
 323         struct ipv6_pinfo *np;
 324         struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
 325         struct net_device *dev = skb->dev;
 326         struct in6_addr *saddr = &hdr->saddr;
 327         struct in6_addr *daddr = &hdr->daddr;
 328         struct udphdr *uh = (struct udphdr*)(skb->data+offset);
 329         struct sock *sk;
 330         int err;
 331
 332         sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex);
 333
 334         if (sk == NULL)
 335                 return;
 336
 337         np = inet6_sk(sk);
 338
 339         if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
 340                 goto out;
 341
 342         if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
 343                 goto out;
 344
 345         if (np->recverr)
 346                 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
 347
 348         sk->sk_err = err;
 349         sk->sk_error_report(sk);
 350 out:
 351         sock_put(sk);
 352 }
 353
 354 static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
 355 {
 356         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
 357                 kfree_skb(skb);
 358                 return -1;
 359         }
 360
 361         if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
 362                 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
 363                         UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
 364                         kfree_skb(skb);
 365                         return 0;
 366                 }
 367                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 368         }
 369
 370         if (sock_queue_rcv_skb(sk,skb)<0) {
 371                 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
 372                 kfree_skb(skb);
 373                 return 0;
 374         }
 375         UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
 376         return 0;
 377 }
 378
 379 static struct sock *udp_v6_mcast_next(struct sock *sk,
 380                                       u16 loc_port, struct in6_addr *loc_addr,
 381                                       u16 rmt_port, struct in6_addr *rmt_addr,
 382                                       int dif)
 383 {
 384         struct hlist_node *node;
 385         struct sock *s = sk;
 386         unsigned short num = ntohs(loc_port);
 387
 388         sk_for_each_from(s, node) {
 389                 struct inet_opt *inet = inet_sk(s);
 390
 391                 if (inet->num == num && s->sk_family == PF_INET6) {
 392                         struct ipv6_pinfo *np = inet6_sk(s);
 393                         if (inet->dport) {
 394                                 if (inet->dport != rmt_port)
 395                                         continue;
 396                         }
 397                         if (!ipv6_addr_any(&np->daddr) &&
 398                             ipv6_addr_cmp(&np->daddr, rmt_addr))
 399                                 continue;
 400
 401                         if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
 402                                 continue;
 403
 404                         if (!ipv6_addr_any(&np->rcv_saddr)) {
 405                                 if (!ipv6_addr_cmp(&np->rcv_saddr, loc_addr))
 406                                         return s;
 407                                 continue;
 408                         }
 409                         if(!inet6_mc_check(s, loc_addr, rmt_addr))
 410                                 continue;
 411                         return s;
 412                 }
 413         }
 414         return NULL;
 415 }
 416
 417 /*
 418  * Note: called only from the BH handler context,
 419  * so we don't need to lock the hashes.
 420  */
 421 static void udpv6_mcast_deliver(struct udphdr *uh,
 422                                 struct in6_addr *saddr, struct in6_addr *daddr,
 423                                 struct sk_buff *skb)
 424 {
 425         struct sock *sk, *sk2;
 426         int dif;
 427
 428         read_lock(&udp_hash_lock);
 429         sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
 430         dif = skb->dev->ifindex;
 431         sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
 432         if (!sk) {
 433                 kfree_skb(skb);
 434                 goto out;
 435         }
 436
 437         sk2 = sk;
 438         while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
 439                                         uh->source, saddr, dif))) {
 440                 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
 441                 if (buff)
 442                         udpv6_queue_rcv_skb(sk2, buff);
 443         }
 444         udpv6_queue_rcv_skb(sk, skb);
 445 out:
 446         read_unlock(&udp_hash_lock);
 447 }
 448
 449 static int udpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
 450 {
 451         struct sk_buff *skb = *pskb;
 452         struct sock *sk;
 453         struct udphdr *uh;
 454         struct net_device *dev = skb->dev;
 455         struct in6_addr *saddr, *daddr;
 456         u32 ulen = 0;
 457
 458         if (!pskb_may_pull(skb, sizeof(struct udphdr)))
 459                 goto short_packet;
 460
 461         saddr = &skb->nh.ipv6h->saddr;
 462         daddr = &skb->nh.ipv6h->daddr;
 463         uh = skb->h.uh;
 464
 465         ulen = ntohs(uh->len);
 466
 467         /* Check for jumbo payload */
 468         if (ulen == 0)
 469                 ulen = skb->len;
 470
 471         if (ulen > skb->len || ulen < sizeof(*uh))
 472                 goto short_packet;
 473
 474         if (uh->check == 0) {
 475                 /* RFC 2460 section 8.1 says that we SHOULD log
 476                    this error. Well, it is reasonable.
 477                  */
 478                 LIMIT_NETDEBUG(
 479                         printk(KERN_INFO "IPv6: udp checksum is 0\n"));
 480                 goto discard;
 481         }
 482
 483         if (ulen < skb->len) {
 484                 if (__pskb_trim(skb, ulen))
 485                         goto discard;
 486                 saddr = &skb->nh.ipv6h->saddr;
 487                 daddr = &skb->nh.ipv6h->daddr;
 488                 uh = skb->h.uh;
 489         }
 490
 491         if (skb->ip_summed==CHECKSUM_HW) {
 492                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 493                 if (csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) {
 494                         LIMIT_NETDEBUG(printk(KERN_DEBUG "udp v6 hw csum failure.\n"));
 495                         skb->ip_summed = CHECKSUM_NONE;
 496                 }
 497         }
 498         if (skb->ip_summed != CHECKSUM_UNNECESSARY)
 499                 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
 500
 501         /*
 502          *      Multicast receive code
 503          */
 504         if (ipv6_addr_is_multicast(daddr)) {
 505                 udpv6_mcast_deliver(uh, saddr, daddr, skb);
 506                 return 0;
 507         }
 508
 509         /* Unicast */
 510
 511         /*
 512          * check socket cache ... must talk to Alan about his plans
 513          * for sock caches... i'll skip this for now.
 514          */
 515         sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
 516
 517         if (sk == NULL) {
 518                 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 519                         goto discard;
 520
 521                 if (skb->ip_summed != CHECKSUM_UNNECESSARY &&
 522                     (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
 523                         goto discard;
 524                 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);
 525
 526                 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
 527
 528                 kfree_skb(skb);
 529                 return(0);
 530         }
 531
 532         /* deliver */
 533
 534         udpv6_queue_rcv_skb(sk, skb);
 535         sock_put(sk);
 536         return(0);
 537
 538 short_packet:
 539         if (net_ratelimit())
 540                 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
 541
 542 discard:
 543         UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
 544         kfree_skb(skb);
 545         return(0);
 546 }
 547 /*
 548  * Throw away all pending data and cancel the corking. Socket is locked.
 549  */
 550 static void udp_v6_flush_pending_frames(struct sock *sk)
 551 {
 552         struct udp_opt *up = udp_sk(sk);
 553
 554         if (up->pending) {
 555                 up->len = 0;
 556                 up->pending = 0;
 557                 ip6_flush_pending_frames(sk);
 558         }
 559 }
 560
 561 /*
 562  *      Sending
 563  */
 564
 565 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_opt *up)
 566 {
 567         struct sk_buff *skb;
 568         struct udphdr *uh;
 569         struct inet_opt *inet = inet_sk(sk);
 570         struct flowi *fl = &inet->cork.fl;
 571         int err = 0;
 572
 573         /* Grab the skbuff where UDP header space exists. */
 574         if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
 575                 goto out;
 576
 577         /*
 578          * Create a UDP header
 579          */
 580         uh = skb->h.uh;
 581         uh->source = fl->fl_ip_sport;
 582         uh->dest = fl->fl_ip_dport;
 583         uh->len = htons(up->len);
 584         uh->check = 0;
 585
 586         if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
 587                 skb->ip_summed = CHECKSUM_NONE;
 588                 goto send;
 589         }
 590
 591         if (skb_queue_len(&sk->sk_write_queue) == 1) {
 592                 skb->csum = csum_partial((char *)uh,
 593                                 sizeof(struct udphdr), skb->csum);
 594                 uh->check = csum_ipv6_magic(&fl->fl6_src,
 595                                             &fl->fl6_dst,
 596                                             up->len, fl->proto, skb->csum);
 597         } else {
 598                 u32 tmp_csum = 0;
 599
 600                 skb_queue_walk(&sk->sk_write_queue, skb) {
 601                         tmp_csum = csum_add(tmp_csum, skb->csum);
 602                 }
 603                 tmp_csum = csum_partial((char *)uh,
 604                                 sizeof(struct udphdr), tmp_csum);
 605                 tmp_csum = csum_ipv6_magic(&fl->fl6_src,
 606                                            &fl->fl6_dst,
 607                                            up->len, fl->proto, tmp_csum);
 608                 uh->check = tmp_csum;
 609
 610         }
 611         if (uh->check == 0)
 612                 uh->check = -1;
 613
 614 send:
 615         err = ip6_push_pending_frames(sk);
 616 out:
 617         up->len = 0;
 618         up->pending = 0;
 619         return err;
 620 }
 621
 622 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
 623                   struct msghdr *msg, size_t len)
 624 {
 625         struct ipv6_txoptions opt_space;
 626         struct udp_opt *up = udp_sk(sk);
 627         struct inet_opt *inet = inet_sk(sk);
 628         struct ipv6_pinfo *np = inet6_sk(sk);
 629         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
 630         struct in6_addr *daddr;
 631         struct ipv6_txoptions *opt = NULL;
 632         struct ip6_flowlabel *flowlabel = NULL;
 633         struct flowi *fl = &inet->cork.fl;
 634         struct dst_entry *dst;
 635         int addr_len = msg->msg_namelen;
 636         int ulen = len;
 637         int hlimit = -1;
 638         int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
 639         int err;
 640
 641         /* destination address check */
 642         if (sin6) {
 643                 if (addr_len < offsetof(struct sockaddr, sa_data))
 644                         return -EINVAL;
 645
 646                 switch (sin6->sin6_family) {
 647                 case AF_INET6:
 648                         if (addr_len < SIN6_LEN_RFC2133)
 649                                 return -EINVAL;
 650                         daddr = &sin6->sin6_addr;
 651                         break;
 652                 case AF_INET:
 653                         goto do_udp_sendmsg;
 654                 case AF_UNSPEC:
 655                         msg->msg_name = sin6 = NULL;
 656                         msg->msg_namelen = addr_len = 0;
 657                         daddr = NULL;
 658                         break;
 659                 default:
 660                         return -EINVAL;
 661                 }
 662         } else if (!up->pending) {
 663                 if (sk->sk_state != TCP_ESTABLISHED)
 664                         return -EDESTADDRREQ;
 665                 daddr = &np->daddr;
 666         } else
 667                 daddr = NULL;
 668
 669         if (daddr) {
 670                 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
 671                         struct sockaddr_in sin;
 672                         sin.sin_family = AF_INET;
 673                         sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
 674                         sin.sin_addr.s_addr = daddr->s6_addr32[3];
 675                         msg->msg_name = &sin;
 676                         msg->msg_namelen = sizeof(sin);
 677 do_udp_sendmsg:
 678                         if (__ipv6_only_sock(sk))
 679                                 return -ENETUNREACH;
 680                         return udp_sendmsg(iocb, sk, msg, len);
 681                 }
 682         }
 683
 684         if (up->pending == AF_INET)
 685                 return udp_sendmsg(iocb, sk, msg, len);
 686
 687         /* Rough check on arithmetic overflow,
 688            better check is made in ip6_build_xmit
 689            */
 690         if (len > INT_MAX - sizeof(struct udphdr))
 691                 return -EMSGSIZE;
 692
 693         if (up->pending) {
 694                 /*
 695                  * There are pending frames.
 696                  * The socket lock must be held while it's corked.
 697                  */
 698                 lock_sock(sk);
 699                 if (likely(up->pending)) {
 700                         if (unlikely(up->pending != AF_INET6)) {
 701                                 release_sock(sk);
 702                                 return -EINVAL;
 703                         }
 704                         dst = NULL;
 705                         goto do_append_data;
 706                 }
 707                 release_sock(sk);
 708         }
 709         ulen += sizeof(struct udphdr);
 710
 711         memset(fl, 0, sizeof(*fl));
 712
 713         if (sin6) {
 714                 if (sin6->sin6_port == 0)
 715                         return -EINVAL;
 716
 717                 fl->fl_ip_dport = sin6->sin6_port;
 718                 daddr = &sin6->sin6_addr;
 719
 720                 if (np->sndflow) {
 721                         fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
 722                         if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
 723                                 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
 724                                 if (flowlabel == NULL)
 725                                         return -EINVAL;
 726                                 daddr = &flowlabel->dst;
 727                         }
 728                 }
 729
 730                 /*
 731                  * Otherwise it will be difficult to maintain
 732                  * sk->sk_dst_cache.
 733                  */
 734                 if (sk->sk_state == TCP_ESTABLISHED &&
 735                     !ipv6_addr_cmp(daddr, &np->daddr))
 736                         daddr = &np->daddr;
 737
 738                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 739                     sin6->sin6_scope_id &&
 740                     ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
 741                         fl->oif = sin6->sin6_scope_id;
 742         } else {
 743                 if (sk->sk_state != TCP_ESTABLISHED)
 744                         return -EDESTADDRREQ;
 745
 746                 fl->fl_ip_dport = inet->dport;
 747                 daddr = &np->daddr;
 748                 fl->fl6_flowlabel = np->flow_label;
 749         }
 750
 751         if (!fl->oif)
 752                 fl->oif = sk->sk_bound_dev_if;
 753
 754         if (msg->msg_controllen) {
 755                 opt = &opt_space;
 756                 memset(opt, 0, sizeof(struct ipv6_txoptions));
 757                 opt->tot_len = sizeof(*opt);
 758
 759                 err = datagram_send_ctl(msg, fl, opt, &hlimit);
 760                 if (err < 0) {
 761                         fl6_sock_release(flowlabel);
 762                         return err;
 763                 }
 764                 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
 765                         flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
 766                         if (flowlabel == NULL)
 767                                 return -EINVAL;
 768                 }
 769                 if (!(opt->opt_nflen|opt->opt_flen))
 770                         opt = NULL;
 771         }
 772         if (opt == NULL)
 773                 opt = np->opt;
 774         if (flowlabel)
 775                 opt = fl6_merge_options(&opt_space, flowlabel, opt);
 776
 777         fl->proto = IPPROTO_UDP;
 778         ipv6_addr_copy(&fl->fl6_dst, daddr);
 779         if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
 780                 ipv6_addr_copy(&fl->fl6_src, &np->saddr);
 781         fl->fl_ip_sport = inet->sport;
 782
 783         /* merge ip6_build_xmit from ip6_output */
 784         if (opt && opt->srcrt) {
 785                 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
 786                 ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
 787         }
 788
 789         if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst))
 790                 fl->oif = np->mcast_oif;
 791
 792         err = ip6_dst_lookup(sk, &dst, fl);
 793         if (err)
 794                 goto out;
 795
 796         if (hlimit < 0) {
 797                 if (ipv6_addr_is_multicast(&fl->fl6_dst))
 798                         hlimit = np->mcast_hops;
 799                 else
 800                         hlimit = np->hop_limit;
 801                 if (hlimit < 0)
 802                         hlimit = dst_metric(dst, RTAX_HOPLIMIT);
 803         }
 804
 805         if (msg->msg_flags&MSG_CONFIRM)
 806                 goto do_confirm;
 807 back_from_confirm:
 808
 809         lock_sock(sk);
 810         if (unlikely(up->pending)) {
 811                 /* The socket is already corked while preparing it. */
 812                 /* ... which is an evident application bug. --ANK */
 813                 release_sock(sk);
 814
 815                 LIMIT_NETDEBUG(printk(KERN_DEBUG "udp cork app bug 2\n"));
 816                 err = -EINVAL;
 817                 goto out;
 818         }
 819
 820         up->pending = AF_INET6;
 821
 822 do_append_data:
 823         up->len += ulen;
 824         err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen, sizeof(struct udphdr),
 825                               hlimit, opt, fl, (struct rt6_info*)dst,
 826                               corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
 827         if (err)
 828                 udp_v6_flush_pending_frames(sk);
 829         else if (!corkreq)
 830                 err = udp_v6_push_pending_frames(sk, up);
 831
 832         if (dst)
 833                 ip6_dst_store(sk, dst,
 834                               !ipv6_addr_cmp(&fl->fl6_dst, &np->daddr) ?
 835                               &np->daddr : NULL);
 836         if (err > 0)
 837                 err = np->recverr ? net_xmit_errno(err) : 0;
 838         release_sock(sk);
 839 out:
 840         fl6_sock_release(flowlabel);
 841         if (!err) {
 842                 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS);
 843                 return len;
 844         }
 845         return err;
 846
 847 do_confirm:
 848         dst_confirm(dst);
 849         if (!(msg->msg_flags&MSG_PROBE) || len)
 850                 goto back_from_confirm;
 851         err = 0;
 852         goto out;
 853 }
 854
 855 static int udpv6_destroy_sock(struct sock *sk)
 856 {
 857         lock_sock(sk);
 858         udp_v6_flush_pending_frames(sk);
 859         release_sock(sk);
 860
 861         inet6_destroy_sock(sk);
 862
 863         return 0;
 864 }
 865
 866 /*
 867  *      Socket option code for UDP
 868  */
 869 static int udpv6_setsockopt(struct sock *sk, int level, int optname,
 870                           char __user *optval, int optlen)
 871 {
 872         struct udp_opt *up = udp_sk(sk);
 873         int val;
 874         int err = 0;
 875
 876         if (level != SOL_UDP)
 877                 return ipv6_setsockopt(sk, level, optname, optval, optlen);
 878
 879         if(optlen<sizeof(int))
 880                 return -EINVAL;
 881
 882         if (get_user(val, (int __user *)optval))
 883                 return -EFAULT;
 884
 885         switch(optname) {
 886         case UDP_CORK:
 887                 if (val != 0) {
 888                         up->corkflag = 1;
 889                 } else {
 890                         up->corkflag = 0;
 891                         lock_sock(sk);
 892                         udp_v6_push_pending_frames(sk, up);
 893                         release_sock(sk);
 894                 }
 895                 break;
 896
 897         case UDP_ENCAP:
 898                 switch (val) {
 899                 case 0:
 900                         up->encap_type = val;
 901                         break;
 902                 default:
 903                         err = -ENOPROTOOPT;
 904                         break;
 905                 }
 906                 break;
 907
 908         default:
 909                 err = -ENOPROTOOPT;
 910                 break;
 911         };
 912
 913         return err;
 914 }
 915
 916 static int udpv6_getsockopt(struct sock *sk, int level, int optname,
 917                           char __user *optval, int __user *optlen)
 918 {
 919         struct udp_opt *up = udp_sk(sk);
 920         int val, len;
 921
 922         if (level != SOL_UDP)
 923                 return ipv6_getsockopt(sk, level, optname, optval, optlen);
 924
 925         if(get_user(len,optlen))
 926                 return -EFAULT;
 927
 928         len = min_t(unsigned int, len, sizeof(int));
 929
 930         if(len < 0)
 931                 return -EINVAL;
 932
 933         switch(optname) {
 934         case UDP_CORK:
 935                 val = up->corkflag;
 936                 break;
 937
 938         case UDP_ENCAP:
 939                 val = up->encap_type;
 940                 break;
 941
 942         default:
 943                 return -ENOPROTOOPT;
 944         };
 945
 946         if(put_user(len, optlen))
 947                 return -EFAULT;
 948         if(copy_to_user(optval, &val,len))
 949                 return -EFAULT;
 950         return 0;
 951 }
 952
 953 static struct inet6_protocol udpv6_protocol = {
 954         .handler        =       udpv6_rcv,
 955         .err_handler    =       udpv6_err,
 956         .flags          =       INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
 957 };
 958
 959 /* ------------------------------------------------------------------------ */
 960 #ifdef CONFIG_PROC_FS
 961
 962 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
 963 {
 964         struct inet_opt *inet = inet_sk(sp);
 965         struct ipv6_pinfo *np = inet6_sk(sp);
 966         struct in6_addr *dest, *src;
 967         __u16 destp, srcp;
 968
 969         dest  = &np->daddr;
 970         src   = &np->rcv_saddr;
 971         destp = ntohs(inet->dport);
 972         srcp  = ntohs(inet->sport);
 973         seq_printf(seq,
 974                    "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
 975                    "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
 976                    bucket,
 977                    src->s6_addr32[0], src->s6_addr32[1],
 978                    src->s6_addr32[2], src->s6_addr32[3], srcp,
 979                    dest->s6_addr32[0], dest->s6_addr32[1],
 980                    dest->s6_addr32[2], dest->s6_addr32[3], destp,
 981                    sp->sk_state,
 982                    atomic_read(&sp->sk_wmem_alloc),
 983                    atomic_read(&sp->sk_rmem_alloc),
 984                    0, 0L, 0,
 985                    sock_i_uid(sp), 0,
 986                    sock_i_ino(sp),
 987                    atomic_read(&sp->sk_refcnt), sp);
 988 }
 989
 990 static int udp6_seq_show(struct seq_file *seq, void *v)
 991 {
 992         if (v == SEQ_START_TOKEN)
 993                 seq_printf(seq,
 994                            "  sl  "
 995                            "local_address                         "
 996                            "remote_address                        "
 997                            "st tx_queue rx_queue tr tm->when retrnsmt"
 998                            "   uid  timeout inode\n");
 999         else
1000                 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1001         return 0;
1002 }
1003
1004 static struct file_operations udp6_seq_fops;
1005 static struct udp_seq_afinfo udp6_seq_afinfo = {
1006         .owner          = THIS_MODULE,
1007         .name           = "udp6",
1008         .family         = AF_INET6,
1009         .seq_show       = udp6_seq_show,
1010         .seq_fops       = &udp6_seq_fops,
1011 };
1012
1013 int __init udp6_proc_init(void)
1014 {
1015         return udp_proc_register(&udp6_seq_afinfo);
1016 }
1017
1018 void udp6_proc_exit(void) {
1019         udp_proc_unregister(&udp6_seq_afinfo);
1020 }
1021 #endif /* CONFIG_PROC_FS */
1022
1023 /* ------------------------------------------------------------------------ */
1024
1025 struct proto udpv6_prot = {
1026         .name =         "UDP",
1027         .close =        udpv6_close,
1028         .connect =      ip6_datagram_connect,
1029         .disconnect =   udp_disconnect,
1030         .ioctl =        udp_ioctl,
1031         .destroy =      udpv6_destroy_sock,
1032         .setsockopt =   udpv6_setsockopt,
1033         .getsockopt =   udpv6_getsockopt,
1034         .sendmsg =      udpv6_sendmsg,
1035         .recvmsg =      udpv6_recvmsg,
1036         .backlog_rcv =  udpv6_queue_rcv_skb,
1037         .hash =         udp_v6_hash,
1038         .unhash =       udp_v6_unhash,
1039         .get_port =     udp_v6_get_port,
1040 };
1041
1042 extern struct proto_ops inet6_dgram_ops;
1043
1044 static struct inet_protosw udpv6_protosw = {
1045         .type =      SOCK_DGRAM,
1046         .protocol =  IPPROTO_UDP,
1047         .prot =      &udpv6_prot,
1048         .ops =       &inet6_dgram_ops,
1049         .capability =-1,
1050         .no_check =  UDP_CSUM_DEFAULT,
1051         .flags =     INET_PROTOSW_PERMANENT,
1052 };
1053
1054
1055 void __init udpv6_init(void)
1056 {
1057         if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1058                 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1059         inet6_register_protosw(&udpv6_protosw);
1060 }