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   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 #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 ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
 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         /* Clear queue. */
 304         if (flags&MSG_PEEK) {
 305                 int clear = 0;
 306                 spin_lock_bh(&sk->sk_receive_queue.lock);
 307                 if (skb == skb_peek(&sk->sk_receive_queue)) {
 308                         __skb_unlink(skb, &sk->sk_receive_queue);
 309                         clear = 1;
 310                 }
 311                 spin_unlock_bh(&sk->sk_receive_queue.lock);
 312                 if (clear)
 313                         kfree_skb(skb);
 314         }
 315
 316         skb_free_datagram(sk, skb);
 317
 318         if (flags & MSG_DONTWAIT) {
 319                 UDP6_INC_STATS_USER(UDP_MIB_INERRORS);
 320                 return -EAGAIN;
 321         }
 322         goto try_again;
 323 }
 324
 325 static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 326                int type, int code, int offset, __u32 info)
 327 {
 328         struct ipv6_pinfo *np;
 329         struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
 330         struct net_device *dev = skb->dev;
 331         struct in6_addr *saddr = &hdr->saddr;
 332         struct in6_addr *daddr = &hdr->daddr;
 333         struct udphdr *uh = (struct udphdr*)(skb->data+offset);
 334         struct sock *sk;
 335         int err;
 336
 337         sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex);
 338
 339         if (sk == NULL)
 340                 return;
 341
 342         np = inet6_sk(sk);
 343
 344         if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
 345                 goto out;
 346
 347         if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
 348                 goto out;
 349
 350         if (np->recverr)
 351                 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
 352
 353         sk->sk_err = err;
 354         sk->sk_error_report(sk);
 355 out:
 356         sock_put(sk);
 357 }
 358
 359 static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
 360 {
 361         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
 362                 kfree_skb(skb);
 363                 return -1;
 364         }
 365
 366         if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
 367                 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
 368                         UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
 369                         kfree_skb(skb);
 370                         return 0;
 371                 }
 372                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 373         }
 374
 375         if (sock_queue_rcv_skb(sk,skb)<0) {
 376                 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
 377                 kfree_skb(skb);
 378                 return 0;
 379         }
 380         UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
 381         return 0;
 382 }
 383
 384 static struct sock *udp_v6_mcast_next(struct sock *sk,
 385                                       u16 loc_port, struct in6_addr *loc_addr,
 386                                       u16 rmt_port, struct in6_addr *rmt_addr,
 387                                       int dif)
 388 {
 389         struct hlist_node *node;
 390         struct sock *s = sk;
 391         unsigned short num = ntohs(loc_port);
 392
 393         sk_for_each_from(s, node) {
 394                 struct inet_sock *inet = inet_sk(s);
 395
 396                 if (inet->num == num && s->sk_family == PF_INET6) {
 397                         struct ipv6_pinfo *np = inet6_sk(s);
 398                         if (inet->dport) {
 399                                 if (inet->dport != rmt_port)
 400                                         continue;
 401                         }
 402                         if (!ipv6_addr_any(&np->daddr) &&
 403                             !ipv6_addr_equal(&np->daddr, rmt_addr))
 404                                 continue;
 405
 406                         if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
 407                                 continue;
 408
 409                         if (!ipv6_addr_any(&np->rcv_saddr)) {
 410                                 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
 411                                         continue;
 412                         }
 413                         if(!inet6_mc_check(s, loc_addr, rmt_addr))
 414                                 continue;
 415                         return s;
 416                 }
 417         }
 418         return NULL;
 419 }
 420
 421 /*
 422  * Note: called only from the BH handler context,
 423  * so we don't need to lock the hashes.
 424  */
 425 static void udpv6_mcast_deliver(struct udphdr *uh,
 426                                 struct in6_addr *saddr, struct in6_addr *daddr,
 427                                 struct sk_buff *skb)
 428 {
 429         struct sock *sk, *sk2;
 430         int dif;
 431
 432         read_lock(&udp_hash_lock);
 433         sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
 434         dif = skb->dev->ifindex;
 435         sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
 436         if (!sk) {
 437                 kfree_skb(skb);
 438                 goto out;
 439         }
 440
 441         sk2 = sk;
 442         while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
 443                                         uh->source, saddr, dif))) {
 444                 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
 445                 if (buff)
 446                         udpv6_queue_rcv_skb(sk2, buff);
 447         }
 448         udpv6_queue_rcv_skb(sk, skb);
 449 out:
 450         read_unlock(&udp_hash_lock);
 451 }
 452
 453 static int udpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
 454 {
 455         struct sk_buff *skb = *pskb;
 456         struct sock *sk;
 457         struct udphdr *uh;
 458         struct net_device *dev = skb->dev;
 459         struct in6_addr *saddr, *daddr;
 460         u32 ulen = 0;
 461
 462         if (!pskb_may_pull(skb, sizeof(struct udphdr)))
 463                 goto short_packet;
 464
 465         saddr = &skb->nh.ipv6h->saddr;
 466         daddr = &skb->nh.ipv6h->daddr;
 467         uh = skb->h.uh;
 468
 469         ulen = ntohs(uh->len);
 470
 471         /* Check for jumbo payload */
 472         if (ulen == 0)
 473                 ulen = skb->len;
 474
 475         if (ulen > skb->len || ulen < sizeof(*uh))
 476                 goto short_packet;
 477
 478         if (uh->check == 0) {
 479                 /* RFC 2460 section 8.1 says that we SHOULD log
 480                    this error. Well, it is reasonable.
 481                  */
 482                 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
 483                 goto discard;
 484         }
 485
 486         if (ulen < skb->len) {
 487                 if (pskb_trim_rcsum(skb, ulen))
 488                         goto discard;
 489                 saddr = &skb->nh.ipv6h->saddr;
 490                 daddr = &skb->nh.ipv6h->daddr;
 491                 uh = skb->h.uh;
 492         }
 493
 494         if (skb->ip_summed==CHECKSUM_HW) {
 495                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 496                 if (csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) {
 497                         LIMIT_NETDEBUG(KERN_DEBUG "udp v6 hw csum failure.\n");
 498                         skb->ip_summed = CHECKSUM_NONE;
 499                 }
 500         }
 501         if (skb->ip_summed != CHECKSUM_UNNECESSARY)
 502                 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
 503
 504         /*
 505          *      Multicast receive code
 506          */
 507         if (ipv6_addr_is_multicast(daddr)) {
 508                 udpv6_mcast_deliver(uh, saddr, daddr, skb);
 509                 return 0;
 510         }
 511
 512         /* Unicast */
 513
 514         /*
 515          * check socket cache ... must talk to Alan about his plans
 516          * for sock caches... i'll skip this for now.
 517          */
 518         sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
 519
 520         if (sk == NULL) {
 521                 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 522                         goto discard;
 523
 524                 if (skb->ip_summed != CHECKSUM_UNNECESSARY &&
 525                     (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
 526                         goto discard;
 527                 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);
 528
 529                 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
 530
 531                 kfree_skb(skb);
 532                 return(0);
 533         }
 534
 535         /* deliver */
 536
 537         udpv6_queue_rcv_skb(sk, skb);
 538         sock_put(sk);
 539         return(0);
 540
 541 short_packet:
 542         if (net_ratelimit())
 543                 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
 544
 545 discard:
 546         UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
 547         kfree_skb(skb);
 548         return(0);
 549 }
 550 /*
 551  * Throw away all pending data and cancel the corking. Socket is locked.
 552  */
 553 static void udp_v6_flush_pending_frames(struct sock *sk)
 554 {
 555         struct udp_sock *up = udp_sk(sk);
 556
 557         if (up->pending) {
 558                 up->len = 0;
 559                 up->pending = 0;
 560                 ip6_flush_pending_frames(sk);
 561         }
 562 }
 563
 564 /*
 565  *      Sending
 566  */
 567
 568 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
 569 {
 570         struct sk_buff *skb;
 571         struct udphdr *uh;
 572         struct inet_sock *inet = inet_sk(sk);
 573         struct flowi *fl = &inet->cork.fl;
 574         int err = 0;
 575
 576         /* Grab the skbuff where UDP header space exists. */
 577         if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
 578                 goto out;
 579
 580         /*
 581          * Create a UDP header
 582          */
 583         uh = skb->h.uh;
 584         uh->source = fl->fl_ip_sport;
 585         uh->dest = fl->fl_ip_dport;
 586         uh->len = htons(up->len);
 587         uh->check = 0;
 588
 589         if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
 590                 skb->ip_summed = CHECKSUM_NONE;
 591                 goto send;
 592         }
 593
 594         if (skb_queue_len(&sk->sk_write_queue) == 1) {
 595                 skb->csum = csum_partial((char *)uh,
 596                                 sizeof(struct udphdr), skb->csum);
 597                 uh->check = csum_ipv6_magic(&fl->fl6_src,
 598                                             &fl->fl6_dst,
 599                                             up->len, fl->proto, skb->csum);
 600         } else {
 601                 u32 tmp_csum = 0;
 602
 603                 skb_queue_walk(&sk->sk_write_queue, skb) {
 604                         tmp_csum = csum_add(tmp_csum, skb->csum);
 605                 }
 606                 tmp_csum = csum_partial((char *)uh,
 607                                 sizeof(struct udphdr), tmp_csum);
 608                 tmp_csum = csum_ipv6_magic(&fl->fl6_src,
 609                                            &fl->fl6_dst,
 610                                            up->len, fl->proto, tmp_csum);
 611                 uh->check = tmp_csum;
 612
 613         }
 614         if (uh->check == 0)
 615                 uh->check = -1;
 616
 617 send:
 618         err = ip6_push_pending_frames(sk);
 619 out:
 620         up->len = 0;
 621         up->pending = 0;
 622         return err;
 623 }
 624
 625 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
 626                   struct msghdr *msg, size_t len)
 627 {
 628         struct ipv6_txoptions opt_space;
 629         struct udp_sock *up = udp_sk(sk);
 630         struct inet_sock *inet = inet_sk(sk);
 631         struct ipv6_pinfo *np = inet6_sk(sk);
 632         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
 633         struct in6_addr *daddr, *final_p = NULL, final;
 634         struct ipv6_txoptions *opt = NULL;
 635         struct ip6_flowlabel *flowlabel = NULL;
 636         struct flowi *fl = &inet->cork.fl;
 637         struct dst_entry *dst;
 638         int addr_len = msg->msg_namelen;
 639         int ulen = len;
 640         int hlimit = -1;
 641         int tclass = -1;
 642         int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
 643         int err;
 644         int connected = 0;
 645
 646         /* destination address check */
 647         if (sin6) {
 648                 if (addr_len < offsetof(struct sockaddr, sa_data))
 649                         return -EINVAL;
 650
 651                 switch (sin6->sin6_family) {
 652                 case AF_INET6:
 653                         if (addr_len < SIN6_LEN_RFC2133)
 654                                 return -EINVAL;
 655                         daddr = &sin6->sin6_addr;
 656                         break;
 657                 case AF_INET:
 658                         goto do_udp_sendmsg;
 659                 case AF_UNSPEC:
 660                         msg->msg_name = sin6 = NULL;
 661                         msg->msg_namelen = addr_len = 0;
 662                         daddr = NULL;
 663                         break;
 664                 default:
 665                         return -EINVAL;
 666                 }
 667         } else if (!up->pending) {
 668                 if (sk->sk_state != TCP_ESTABLISHED)
 669                         return -EDESTADDRREQ;
 670                 daddr = &np->daddr;
 671         } else
 672                 daddr = NULL;
 673
 674         if (daddr) {
 675                 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
 676                         struct sockaddr_in sin;
 677                         sin.sin_family = AF_INET;
 678                         sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
 679                         sin.sin_addr.s_addr = daddr->s6_addr32[3];
 680                         msg->msg_name = &sin;
 681                         msg->msg_namelen = sizeof(sin);
 682 do_udp_sendmsg:
 683                         if (__ipv6_only_sock(sk))
 684                                 return -ENETUNREACH;
 685                         return udp_sendmsg(iocb, sk, msg, len);
 686                 }
 687         }
 688
 689         if (up->pending == AF_INET)
 690                 return udp_sendmsg(iocb, sk, msg, len);
 691
 692         /* Rough check on arithmetic overflow,
 693            better check is made in ip6_build_xmit
 694            */
 695         if (len > INT_MAX - sizeof(struct udphdr))
 696                 return -EMSGSIZE;
 697
 698         if (up->pending) {
 699                 /*
 700                  * There are pending frames.
 701                  * The socket lock must be held while it's corked.
 702                  */
 703                 lock_sock(sk);
 704                 if (likely(up->pending)) {
 705                         if (unlikely(up->pending != AF_INET6)) {
 706                                 release_sock(sk);
 707                                 return -EAFNOSUPPORT;
 708                         }
 709                         dst = NULL;
 710                         goto do_append_data;
 711                 }
 712                 release_sock(sk);
 713         }
 714         ulen += sizeof(struct udphdr);
 715
 716         memset(fl, 0, sizeof(*fl));
 717
 718         if (sin6) {
 719                 if (sin6->sin6_port == 0)
 720                         return -EINVAL;
 721
 722                 fl->fl_ip_dport = sin6->sin6_port;
 723                 daddr = &sin6->sin6_addr;
 724
 725                 if (np->sndflow) {
 726                         fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
 727                         if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
 728                                 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
 729                                 if (flowlabel == NULL)
 730                                         return -EINVAL;
 731                                 daddr = &flowlabel->dst;
 732                         }
 733                 }
 734
 735                 /*
 736                  * Otherwise it will be difficult to maintain
 737                  * sk->sk_dst_cache.
 738                  */
 739                 if (sk->sk_state == TCP_ESTABLISHED &&
 740                     ipv6_addr_equal(daddr, &np->daddr))
 741                         daddr = &np->daddr;
 742
 743                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 744                     sin6->sin6_scope_id &&
 745                     ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
 746                         fl->oif = sin6->sin6_scope_id;
 747         } else {
 748                 if (sk->sk_state != TCP_ESTABLISHED)
 749                         return -EDESTADDRREQ;
 750
 751                 fl->fl_ip_dport = inet->dport;
 752                 daddr = &np->daddr;
 753                 fl->fl6_flowlabel = np->flow_label;
 754                 connected = 1;
 755         }
 756
 757         if (!fl->oif)
 758                 fl->oif = sk->sk_bound_dev_if;
 759
 760         if (msg->msg_controllen) {
 761                 opt = &opt_space;
 762                 memset(opt, 0, sizeof(struct ipv6_txoptions));
 763                 opt->tot_len = sizeof(*opt);
 764
 765                 err = datagram_send_ctl(msg, fl, opt, &hlimit, &tclass);
 766                 if (err < 0) {
 767                         fl6_sock_release(flowlabel);
 768                         return err;
 769                 }
 770                 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
 771                         flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
 772                         if (flowlabel == NULL)
 773                                 return -EINVAL;
 774                 }
 775                 if (!(opt->opt_nflen|opt->opt_flen))
 776                         opt = NULL;
 777                 connected = 0;
 778         }
 779         if (opt == NULL)
 780                 opt = np->opt;
 781         opt = fl6_merge_options(&opt_space, flowlabel, opt);
 782
 783         fl->proto = IPPROTO_UDP;
 784         ipv6_addr_copy(&fl->fl6_dst, daddr);
 785         if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
 786                 ipv6_addr_copy(&fl->fl6_src, &np->saddr);
 787         fl->fl_ip_sport = inet->sport;
 788
 789         /* merge ip6_build_xmit from ip6_output */
 790         if (opt && opt->srcrt) {
 791                 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
 792                 ipv6_addr_copy(&final, &fl->fl6_dst);
 793                 ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
 794                 final_p = &final;
 795                 connected = 0;
 796         }
 797
 798         if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst)) {
 799                 fl->oif = np->mcast_oif;
 800                 connected = 0;
 801         }
 802
 803         err = ip6_dst_lookup(sk, &dst, fl);
 804         if (err)
 805                 goto out;
 806         if (final_p)
 807                 ipv6_addr_copy(&fl->fl6_dst, final_p);
 808
 809         if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0)
 810                 goto out;
 811
 812         if (hlimit < 0) {
 813                 if (ipv6_addr_is_multicast(&fl->fl6_dst))
 814                         hlimit = np->mcast_hops;
 815                 else
 816                         hlimit = np->hop_limit;
 817                 if (hlimit < 0)
 818                         hlimit = dst_metric(dst, RTAX_HOPLIMIT);
 819                 if (hlimit < 0)
 820                         hlimit = ipv6_get_hoplimit(dst->dev);
 821         }
 822
 823         if (tclass < 0) {
 824                 tclass = np->tclass;
 825                 if (tclass < 0)
 826                         tclass = 0;
 827         }
 828
 829         if (msg->msg_flags&MSG_CONFIRM)
 830                 goto do_confirm;
 831 back_from_confirm:
 832
 833         lock_sock(sk);
 834         if (unlikely(up->pending)) {
 835                 /* The socket is already corked while preparing it. */
 836                 /* ... which is an evident application bug. --ANK */
 837                 release_sock(sk);
 838
 839                 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
 840                 err = -EINVAL;
 841                 goto out;
 842         }
 843
 844         up->pending = AF_INET6;
 845
 846 do_append_data:
 847         up->len += ulen;
 848         err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen,
 849                 sizeof(struct udphdr), hlimit, tclass, opt, fl,
 850                 (struct rt6_info*)dst,
 851                 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
 852         if (err)
 853                 udp_v6_flush_pending_frames(sk);
 854         else if (!corkreq)
 855                 err = udp_v6_push_pending_frames(sk, up);
 856
 857         if (dst) {
 858                 if (connected) {
 859                         ip6_dst_store(sk, dst,
 860                                       ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ?
 861                                       &np->daddr : NULL);
 862                 } else {
 863                         dst_release(dst);
 864                 }
 865         }
 866
 867         if (err > 0)
 868                 err = np->recverr ? net_xmit_errno(err) : 0;
 869         release_sock(sk);
 870 out:
 871         fl6_sock_release(flowlabel);
 872         if (!err) {
 873                 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS);
 874                 return len;
 875         }
 876         return err;
 877
 878 do_confirm:
 879         dst_confirm(dst);
 880         if (!(msg->msg_flags&MSG_PROBE) || len)
 881                 goto back_from_confirm;
 882         err = 0;
 883         goto out;
 884 }
 885
 886 static int udpv6_destroy_sock(struct sock *sk)
 887 {
 888         lock_sock(sk);
 889         udp_v6_flush_pending_frames(sk);
 890         release_sock(sk);
 891
 892         inet6_destroy_sock(sk);
 893
 894         return 0;
 895 }
 896
 897 /*
 898  *      Socket option code for UDP
 899  */
 900 static int udpv6_setsockopt(struct sock *sk, int level, int optname,
 901                           char __user *optval, int optlen)
 902 {
 903         struct udp_sock *up = udp_sk(sk);
 904         int val;
 905         int err = 0;
 906
 907         if (level != SOL_UDP)
 908                 return ipv6_setsockopt(sk, level, optname, optval, optlen);
 909
 910         if(optlen<sizeof(int))
 911                 return -EINVAL;
 912
 913         if (get_user(val, (int __user *)optval))
 914                 return -EFAULT;
 915
 916         switch(optname) {
 917         case UDP_CORK:
 918                 if (val != 0) {
 919                         up->corkflag = 1;
 920                 } else {
 921                         up->corkflag = 0;
 922                         lock_sock(sk);
 923                         udp_v6_push_pending_frames(sk, up);
 924                         release_sock(sk);
 925                 }
 926                 break;
 927
 928         case UDP_ENCAP:
 929                 switch (val) {
 930                 case 0:
 931                         up->encap_type = val;
 932                         break;
 933                 default:
 934                         err = -ENOPROTOOPT;
 935                         break;
 936                 }
 937                 break;
 938
 939         default:
 940                 err = -ENOPROTOOPT;
 941                 break;
 942         };
 943
 944         return err;
 945 }
 946
 947 static int udpv6_getsockopt(struct sock *sk, int level, int optname,
 948                           char __user *optval, int __user *optlen)
 949 {
 950         struct udp_sock *up = udp_sk(sk);
 951         int val, len;
 952
 953         if (level != SOL_UDP)
 954                 return ipv6_getsockopt(sk, level, optname, optval, optlen);
 955
 956         if(get_user(len,optlen))
 957                 return -EFAULT;
 958
 959         len = min_t(unsigned int, len, sizeof(int));
 960
 961         if(len < 0)
 962                 return -EINVAL;
 963
 964         switch(optname) {
 965         case UDP_CORK:
 966                 val = up->corkflag;
 967                 break;
 968
 969         case UDP_ENCAP:
 970                 val = up->encap_type;
 971                 break;
 972
 973         default:
 974                 return -ENOPROTOOPT;
 975         };
 976
 977         if(put_user(len, optlen))
 978                 return -EFAULT;
 979         if(copy_to_user(optval, &val,len))
 980                 return -EFAULT;
 981         return 0;
 982 }
 983
 984 static struct inet6_protocol udpv6_protocol = {
 985         .handler        =       udpv6_rcv,
 986         .err_handler    =       udpv6_err,
 987         .flags          =       INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
 988 };
 989
 990 /* ------------------------------------------------------------------------ */
 991 #ifdef CONFIG_PROC_FS
 992
 993 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
 994 {
 995         struct inet_sock *inet = inet_sk(sp);
 996         struct ipv6_pinfo *np = inet6_sk(sp);
 997         struct in6_addr *dest, *src;
 998         __u16 destp, srcp;
 999
1000         dest  = &np->daddr;
1001         src   = &np->rcv_saddr;
1002         destp = ntohs(inet->dport);
1003         srcp  = ntohs(inet->sport);
1004         seq_printf(seq,
1005                    "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1006                    "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
1007                    bucket,
1008                    src->s6_addr32[0], src->s6_addr32[1],
1009                    src->s6_addr32[2], src->s6_addr32[3], srcp,
1010                    dest->s6_addr32[0], dest->s6_addr32[1],
1011                    dest->s6_addr32[2], dest->s6_addr32[3], destp,
1012                    sp->sk_state,
1013                    atomic_read(&sp->sk_wmem_alloc),
1014                    atomic_read(&sp->sk_rmem_alloc),
1015                    0, 0L, 0,
1016                    sock_i_uid(sp), 0,
1017                    sock_i_ino(sp),
1018                    atomic_read(&sp->sk_refcnt), sp);
1019 }
1020
1021 static int udp6_seq_show(struct seq_file *seq, void *v)
1022 {
1023         if (v == SEQ_START_TOKEN)
1024                 seq_printf(seq,
1025                            "  sl  "
1026                            "local_address                         "
1027                            "remote_address                        "
1028                            "st tx_queue rx_queue tr tm->when retrnsmt"
1029                            "   uid  timeout inode\n");
1030         else
1031                 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1032         return 0;
1033 }
1034
1035 static struct file_operations udp6_seq_fops;
1036 static struct udp_seq_afinfo udp6_seq_afinfo = {
1037         .owner          = THIS_MODULE,
1038         .name           = "udp6",
1039         .family         = AF_INET6,
1040         .seq_show       = udp6_seq_show,
1041         .seq_fops       = &udp6_seq_fops,
1042 };
1043
1044 int __init udp6_proc_init(void)
1045 {
1046         return udp_proc_register(&udp6_seq_afinfo);
1047 }
1048
1049 void udp6_proc_exit(void) {
1050         udp_proc_unregister(&udp6_seq_afinfo);
1051 }
1052 #endif /* CONFIG_PROC_FS */
1053
1054 /* ------------------------------------------------------------------------ */
1055
1056 struct proto udpv6_prot = {
1057         .name =         "UDPv6",
1058         .owner =        THIS_MODULE,
1059         .close =        udpv6_close,
1060         .connect =      ip6_datagram_connect,
1061         .disconnect =   udp_disconnect,
1062         .ioctl =        udp_ioctl,
1063         .destroy =      udpv6_destroy_sock,
1064         .setsockopt =   udpv6_setsockopt,
1065         .getsockopt =   udpv6_getsockopt,
1066         .sendmsg =      udpv6_sendmsg,
1067         .recvmsg =      udpv6_recvmsg,
1068         .backlog_rcv =  udpv6_queue_rcv_skb,
1069         .hash =         udp_v6_hash,
1070         .unhash =       udp_v6_unhash,
1071         .get_port =     udp_v6_get_port,
1072         .obj_size =     sizeof(struct udp6_sock),
1073 };
1074
1075 static struct inet_protosw udpv6_protosw = {
1076         .type =      SOCK_DGRAM,
1077         .protocol =  IPPROTO_UDP,
1078         .prot =      &udpv6_prot,
1079         .ops =       &inet6_dgram_ops,
1080         .capability =-1,
1081         .no_check =  UDP_CSUM_DEFAULT,
1082         .flags =     INET_PROTOSW_PERMANENT,
1083 };
1084
1085
1086 void __init udpv6_init(void)
1087 {
1088         if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1089                 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1090         inet6_register_protosw(&udpv6_protosw);
1091 }