git.oblomov.eu Git - linux-2.6/blob - 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_sock *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_equal(&np->rcv_saddr, daddr))
 175                                         continue;
 176                                 score++;
 177                         }
 178                         if (!ipv6_addr_any(&np->daddr)) {
 179                                 if (!ipv6_addr_equal(&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 inet_sock *inet = inet_sk(sk);
 223         struct sk_buff *skb;
 224         size_t copied;
 225         int err;
 226
 227         if (addr_len)
 228                 *addr_len=sizeof(struct sockaddr_in6);
 229
 230         if (flags & MSG_ERRQUEUE)
 231                 return ipv6_recv_error(sk, msg, len);
 232
 233 try_again:
 234         skb = skb_recv_datagram(sk, flags, noblock, &err);
 235         if (!skb)
 236                 goto out;
 237
 238         copied = skb->len - sizeof(struct udphdr);
 239         if (copied > len) {
 240                 copied = len;
 241                 msg->msg_flags |= MSG_TRUNC;
 242         }
 243
 244         if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
 245                 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
 246                                               copied);
 247         } else if (msg->msg_flags&MSG_TRUNC) {
 248                 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
 249                         goto csum_copy_err;
 250                 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
 251                                               copied);
 252         } else {
 253                 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
 254                 if (err == -EINVAL)
 255                         goto csum_copy_err;
 256         }
 257         if (err)
 258                 goto out_free;
 259
 260         sock_recv_timestamp(msg, sk, skb);
 261
 262         /* Copy the address. */
 263         if (msg->msg_name) {
 264                 struct sockaddr_in6 *sin6;
 265
 266                 sin6 = (struct sockaddr_in6 *) msg->msg_name;
 267                 sin6->sin6_family = AF_INET6;
 268                 sin6->sin6_port = skb->h.uh->source;
 269                 sin6->sin6_flowinfo = 0;
 270                 sin6->sin6_scope_id = 0;
 271
 272                 if (skb->protocol == htons(ETH_P_IP))
 273                         ipv6_addr_set(&sin6->sin6_addr, 0, 0,
 274                                       htonl(0xffff), skb->nh.iph->saddr);
 275                 else {
 276                         ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
 277                         if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 278                                 sin6->sin6_scope_id = IP6CB(skb)->iif;
 279                 }
 280
 281         }
 282         if (skb->protocol == htons(ETH_P_IP)) {
 283                 if (inet->cmsg_flags)
 284                         ip_cmsg_recv(msg, skb);
 285         } else {
 286                 if (np->rxopt.all)
 287                         datagram_recv_ctl(sk, msg, skb);
 288         }
 289
 290         err = copied;
 291         if (flags & MSG_TRUNC)
 292                 err = skb->len - sizeof(struct udphdr);
 293
 294 out_free:
 295         skb_free_datagram(sk, skb);
 296 out:
 297         return err;
 298
 299 csum_copy_err:
 300         /* Clear queue. */
 301         if (flags&MSG_PEEK) {
 302                 int clear = 0;
 303                 spin_lock_bh(&sk->sk_receive_queue.lock);
 304                 if (skb == skb_peek(&sk->sk_receive_queue)) {
 305                         __skb_unlink(skb, &sk->sk_receive_queue);
 306                         clear = 1;
 307                 }
 308                 spin_unlock_bh(&sk->sk_receive_queue.lock);
 309                 if (clear)
 310                         kfree_skb(skb);
 311         }
 312
 313         skb_free_datagram(sk, skb);
 314
 315         if (flags & MSG_DONTWAIT) {
 316                 UDP6_INC_STATS_USER(UDP_MIB_INERRORS);
 317                 return -EAGAIN;
 318         }
 319         goto try_again;
 320 }
 321
 322 static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 323                int type, int code, int offset, __u32 info)
 324 {
 325         struct ipv6_pinfo *np;
 326         struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
 327         struct net_device *dev = skb->dev;
 328         struct in6_addr *saddr = &hdr->saddr;
 329         struct in6_addr *daddr = &hdr->daddr;
 330         struct udphdr *uh = (struct udphdr*)(skb->data+offset);
 331         struct sock *sk;
 332         int err;
 333
 334         sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex);
 335
 336         if (sk == NULL)
 337                 return;
 338
 339         np = inet6_sk(sk);
 340
 341         if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
 342                 goto out;
 343
 344         if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
 345                 goto out;
 346
 347         if (np->recverr)
 348                 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
 349
 350         sk->sk_err = err;
 351         sk->sk_error_report(sk);
 352 out:
 353         sock_put(sk);
 354 }
 355
 356 static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
 357 {
 358         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
 359                 kfree_skb(skb);
 360                 return -1;
 361         }
 362
 363         if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
 364                 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
 365                         UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
 366                         kfree_skb(skb);
 367                         return 0;
 368                 }
 369                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 370         }
 371
 372         if (sock_queue_rcv_skb(sk,skb)<0) {
 373                 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
 374                 kfree_skb(skb);
 375                 return 0;
 376         }
 377         UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
 378         return 0;
 379 }
 380
 381 static struct sock *udp_v6_mcast_next(struct sock *sk,
 382                                       u16 loc_port, struct in6_addr *loc_addr,
 383                                       u16 rmt_port, struct in6_addr *rmt_addr,
 384                                       int dif)
 385 {
 386         struct hlist_node *node;
 387         struct sock *s = sk;
 388         unsigned short num = ntohs(loc_port);
 389
 390         sk_for_each_from(s, node) {
 391                 struct inet_sock *inet = inet_sk(s);
 392
 393                 if (inet->num == num && s->sk_family == PF_INET6) {
 394                         struct ipv6_pinfo *np = inet6_sk(s);
 395                         if (inet->dport) {
 396                                 if (inet->dport != rmt_port)
 397                                         continue;
 398                         }
 399                         if (!ipv6_addr_any(&np->daddr) &&
 400                             !ipv6_addr_equal(&np->daddr, rmt_addr))
 401                                 continue;
 402
 403                         if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
 404                                 continue;
 405
 406                         if (!ipv6_addr_any(&np->rcv_saddr)) {
 407                                 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
 408                                         return s;
 409                                 continue;
 410                         }
 411                         if(!inet6_mc_check(s, loc_addr, rmt_addr))
 412                                 continue;
 413                         return s;
 414                 }
 415         }
 416         return NULL;
 417 }
 418
 419 /*
 420  * Note: called only from the BH handler context,
 421  * so we don't need to lock the hashes.
 422  */
 423 static void udpv6_mcast_deliver(struct udphdr *uh,
 424                                 struct in6_addr *saddr, struct in6_addr *daddr,
 425                                 struct sk_buff *skb)
 426 {
 427         struct sock *sk, *sk2;
 428         int dif;
 429
 430         read_lock(&udp_hash_lock);
 431         sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
 432         dif = skb->dev->ifindex;
 433         sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
 434         if (!sk) {
 435                 kfree_skb(skb);
 436                 goto out;
 437         }
 438
 439         sk2 = sk;
 440         while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
 441                                         uh->source, saddr, dif))) {
 442                 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
 443                 if (buff)
 444                         udpv6_queue_rcv_skb(sk2, buff);
 445         }
 446         udpv6_queue_rcv_skb(sk, skb);
 447 out:
 448         read_unlock(&udp_hash_lock);
 449 }
 450
 451 static int udpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
 452 {
 453         struct sk_buff *skb = *pskb;
 454         struct sock *sk;
 455         struct udphdr *uh;
 456         struct net_device *dev = skb->dev;
 457         struct in6_addr *saddr, *daddr;
 458         u32 ulen = 0;
 459
 460         if (!pskb_may_pull(skb, sizeof(struct udphdr)))
 461                 goto short_packet;
 462
 463         saddr = &skb->nh.ipv6h->saddr;
 464         daddr = &skb->nh.ipv6h->daddr;
 465         uh = skb->h.uh;
 466
 467         ulen = ntohs(uh->len);
 468
 469         /* Check for jumbo payload */
 470         if (ulen == 0)
 471                 ulen = skb->len;
 472
 473         if (ulen > skb->len || ulen < sizeof(*uh))
 474                 goto short_packet;
 475
 476         if (uh->check == 0) {
 477                 /* RFC 2460 section 8.1 says that we SHOULD log
 478                    this error. Well, it is reasonable.
 479                  */
 480                 LIMIT_NETDEBUG(
 481                         printk(KERN_INFO "IPv6: udp checksum is 0\n"));
 482                 goto discard;
 483         }
 484
 485         if (ulen < skb->len) {
 486                 if (__pskb_trim(skb, ulen))
 487                         goto discard;
 488                 saddr = &skb->nh.ipv6h->saddr;
 489                 daddr = &skb->nh.ipv6h->daddr;
 490                 uh = skb->h.uh;
 491         }
 492
 493         if (skb->ip_summed==CHECKSUM_HW) {
 494                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 495                 if (csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) {
 496                         LIMIT_NETDEBUG(printk(KERN_DEBUG "udp v6 hw csum failure.\n"));
 497                         skb->ip_summed = CHECKSUM_NONE;
 498                 }
 499         }
 500         if (skb->ip_summed != CHECKSUM_UNNECESSARY)
 501                 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
 502
 503         /*
 504          *      Multicast receive code
 505          */
 506         if (ipv6_addr_is_multicast(daddr)) {
 507                 udpv6_mcast_deliver(uh, saddr, daddr, skb);
 508                 return 0;
 509         }
 510
 511         /* Unicast */
 512
 513         /*
 514          * check socket cache ... must talk to Alan about his plans
 515          * for sock caches... i'll skip this for now.
 516          */
 517         sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
 518
 519         if (sk == NULL) {
 520                 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 521                         goto discard;
 522
 523                 if (skb->ip_summed != CHECKSUM_UNNECESSARY &&
 524                     (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
 525                         goto discard;
 526                 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);
 527
 528                 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
 529
 530                 kfree_skb(skb);
 531                 return(0);
 532         }
 533
 534         /* deliver */
 535
 536         udpv6_queue_rcv_skb(sk, skb);
 537         sock_put(sk);
 538         return(0);
 539
 540 short_packet:
 541         if (net_ratelimit())
 542                 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
 543
 544 discard:
 545         UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
 546         kfree_skb(skb);
 547         return(0);
 548 }
 549 /*
 550  * Throw away all pending data and cancel the corking. Socket is locked.
 551  */
 552 static void udp_v6_flush_pending_frames(struct sock *sk)
 553 {
 554         struct udp_sock *up = udp_sk(sk);
 555
 556         if (up->pending) {
 557                 up->len = 0;
 558                 up->pending = 0;
 559                 ip6_flush_pending_frames(sk);
 560         }
 561 }
 562
 563 /*
 564  *      Sending
 565  */
 566
 567 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
 568 {
 569         struct sk_buff *skb;
 570         struct udphdr *uh;
 571         struct inet_sock *inet = inet_sk(sk);
 572         struct flowi *fl = &inet->cork.fl;
 573         int err = 0;
 574
 575         /* Grab the skbuff where UDP header space exists. */
 576         if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
 577                 goto out;
 578
 579         /*
 580          * Create a UDP header
 581          */
 582         uh = skb->h.uh;
 583         uh->source = fl->fl_ip_sport;
 584         uh->dest = fl->fl_ip_dport;
 585         uh->len = htons(up->len);
 586         uh->check = 0;
 587
 588         if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
 589                 skb->ip_summed = CHECKSUM_NONE;
 590                 goto send;
 591         }
 592
 593         if (skb_queue_len(&sk->sk_write_queue) == 1) {
 594                 skb->csum = csum_partial((char *)uh,
 595                                 sizeof(struct udphdr), skb->csum);
 596                 uh->check = csum_ipv6_magic(&fl->fl6_src,
 597                                             &fl->fl6_dst,
 598                                             up->len, fl->proto, skb->csum);
 599         } else {
 600                 u32 tmp_csum = 0;
 601
 602                 skb_queue_walk(&sk->sk_write_queue, skb) {
 603                         tmp_csum = csum_add(tmp_csum, skb->csum);
 604                 }
 605                 tmp_csum = csum_partial((char *)uh,
 606                                 sizeof(struct udphdr), tmp_csum);
 607                 tmp_csum = csum_ipv6_magic(&fl->fl6_src,
 608                                            &fl->fl6_dst,
 609                                            up->len, fl->proto, tmp_csum);
 610                 uh->check = tmp_csum;
 611
 612         }
 613         if (uh->check == 0)
 614                 uh->check = -1;
 615
 616 send:
 617         err = ip6_push_pending_frames(sk);
 618 out:
 619         up->len = 0;
 620         up->pending = 0;
 621         return err;
 622 }
 623
 624 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
 625                   struct msghdr *msg, size_t len)
 626 {
 627         struct ipv6_txoptions opt_space;
 628         struct udp_sock *up = udp_sk(sk);
 629         struct inet_sock *inet = inet_sk(sk);
 630         struct ipv6_pinfo *np = inet6_sk(sk);
 631         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
 632         struct in6_addr *daddr, *final_p = NULL, final;
 633         struct ipv6_txoptions *opt = NULL;
 634         struct ip6_flowlabel *flowlabel = NULL;
 635         struct flowi *fl = &inet->cork.fl;
 636         struct dst_entry *dst;
 637         int addr_len = msg->msg_namelen;
 638         int ulen = len;
 639         int hlimit = -1;
 640         int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
 641         int err;
 642
 643         /* destination address check */
 644         if (sin6) {
 645                 if (addr_len < offsetof(struct sockaddr, sa_data))
 646                         return -EINVAL;
 647
 648                 switch (sin6->sin6_family) {
 649                 case AF_INET6:
 650                         if (addr_len < SIN6_LEN_RFC2133)
 651                                 return -EINVAL;
 652                         daddr = &sin6->sin6_addr;
 653                         break;
 654                 case AF_INET:
 655                         goto do_udp_sendmsg;
 656                 case AF_UNSPEC:
 657                         msg->msg_name = sin6 = NULL;
 658                         msg->msg_namelen = addr_len = 0;
 659                         daddr = NULL;
 660                         break;
 661                 default:
 662                         return -EINVAL;
 663                 }
 664         } else if (!up->pending) {
 665                 if (sk->sk_state != TCP_ESTABLISHED)
 666                         return -EDESTADDRREQ;
 667                 daddr = &np->daddr;
 668         } else
 669                 daddr = NULL;
 670
 671         if (daddr) {
 672                 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
 673                         struct sockaddr_in sin;
 674                         sin.sin_family = AF_INET;
 675                         sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
 676                         sin.sin_addr.s_addr = daddr->s6_addr32[3];
 677                         msg->msg_name = &sin;
 678                         msg->msg_namelen = sizeof(sin);
 679 do_udp_sendmsg:
 680                         if (__ipv6_only_sock(sk))
 681                                 return -ENETUNREACH;
 682                         return udp_sendmsg(iocb, sk, msg, len);
 683                 }
 684         }
 685
 686         if (up->pending == AF_INET)
 687                 return udp_sendmsg(iocb, sk, msg, len);
 688
 689         /* Rough check on arithmetic overflow,
 690            better check is made in ip6_build_xmit
 691            */
 692         if (len > INT_MAX - sizeof(struct udphdr))
 693                 return -EMSGSIZE;
 694
 695         if (up->pending) {
 696                 /*
 697                  * There are pending frames.
 698                  * The socket lock must be held while it's corked.
 699                  */
 700                 lock_sock(sk);
 701                 if (likely(up->pending)) {
 702                         if (unlikely(up->pending != AF_INET6)) {
 703                                 release_sock(sk);
 704                                 return -EAFNOSUPPORT;
 705                         }
 706                         dst = NULL;
 707                         goto do_append_data;
 708                 }
 709                 release_sock(sk);
 710         }
 711         ulen += sizeof(struct udphdr);
 712
 713         memset(fl, 0, sizeof(*fl));
 714
 715         if (sin6) {
 716                 if (sin6->sin6_port == 0)
 717                         return -EINVAL;
 718
 719                 fl->fl_ip_dport = sin6->sin6_port;
 720                 daddr = &sin6->sin6_addr;
 721
 722                 if (np->sndflow) {
 723                         fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
 724                         if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
 725                                 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
 726                                 if (flowlabel == NULL)
 727                                         return -EINVAL;
 728                                 daddr = &flowlabel->dst;
 729                         }
 730                 }
 731
 732                 /*
 733                  * Otherwise it will be difficult to maintain
 734                  * sk->sk_dst_cache.
 735                  */
 736                 if (sk->sk_state == TCP_ESTABLISHED &&
 737                     ipv6_addr_equal(daddr, &np->daddr))
 738                         daddr = &np->daddr;
 739
 740                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 741                     sin6->sin6_scope_id &&
 742                     ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
 743                         fl->oif = sin6->sin6_scope_id;
 744         } else {
 745                 if (sk->sk_state != TCP_ESTABLISHED)
 746                         return -EDESTADDRREQ;
 747
 748                 fl->fl_ip_dport = inet->dport;
 749                 daddr = &np->daddr;
 750                 fl->fl6_flowlabel = np->flow_label;
 751         }
 752
 753         if (!fl->oif)
 754                 fl->oif = sk->sk_bound_dev_if;
 755
 756         if (msg->msg_controllen) {
 757                 opt = &opt_space;
 758                 memset(opt, 0, sizeof(struct ipv6_txoptions));
 759                 opt->tot_len = sizeof(*opt);
 760
 761                 err = datagram_send_ctl(msg, fl, opt, &hlimit);
 762                 if (err < 0) {
 763                         fl6_sock_release(flowlabel);
 764                         return err;
 765                 }
 766                 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
 767                         flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
 768                         if (flowlabel == NULL)
 769                                 return -EINVAL;
 770                 }
 771                 if (!(opt->opt_nflen|opt->opt_flen))
 772                         opt = NULL;
 773         }
 774         if (opt == NULL)
 775                 opt = np->opt;
 776         if (flowlabel)
 777                 opt = fl6_merge_options(&opt_space, flowlabel, opt);
 778
 779         fl->proto = IPPROTO_UDP;
 780         ipv6_addr_copy(&fl->fl6_dst, daddr);
 781         if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
 782                 ipv6_addr_copy(&fl->fl6_src, &np->saddr);
 783         fl->fl_ip_sport = inet->sport;
 784
 785         /* merge ip6_build_xmit from ip6_output */
 786         if (opt && opt->srcrt) {
 787                 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
 788                 ipv6_addr_copy(&final, &fl->fl6_dst);
 789                 ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
 790                 final_p = &final;
 791         }
 792
 793         if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst))
 794                 fl->oif = np->mcast_oif;
 795
 796         err = ip6_dst_lookup(sk, &dst, fl);
 797         if (err)
 798                 goto out;
 799         if (final_p)
 800                 ipv6_addr_copy(&fl->fl6_dst, final_p);
 801
 802         if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0) {
 803                 dst_release(dst);
 804                 goto out;
 805         }
 806
 807         if (hlimit < 0) {
 808                 if (ipv6_addr_is_multicast(&fl->fl6_dst))
 809                         hlimit = np->mcast_hops;
 810                 else
 811                         hlimit = np->hop_limit;
 812                 if (hlimit < 0)
 813                         hlimit = dst_metric(dst, RTAX_HOPLIMIT);
 814                 if (hlimit < 0)
 815                         hlimit = ipv6_get_hoplimit(dst->dev);
 816         }
 817
 818         if (msg->msg_flags&MSG_CONFIRM)
 819                 goto do_confirm;
 820 back_from_confirm:
 821
 822         lock_sock(sk);
 823         if (unlikely(up->pending)) {
 824                 /* The socket is already corked while preparing it. */
 825                 /* ... which is an evident application bug. --ANK */
 826                 release_sock(sk);
 827
 828                 LIMIT_NETDEBUG(printk(KERN_DEBUG "udp cork app bug 2\n"));
 829                 err = -EINVAL;
 830                 goto out;
 831         }
 832
 833         up->pending = AF_INET6;
 834
 835 do_append_data:
 836         up->len += ulen;
 837         err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen, sizeof(struct udphdr),
 838                               hlimit, opt, fl, (struct rt6_info*)dst,
 839                               corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
 840         if (err)
 841                 udp_v6_flush_pending_frames(sk);
 842         else if (!corkreq)
 843                 err = udp_v6_push_pending_frames(sk, up);
 844
 845         if (dst)
 846                 ip6_dst_store(sk, dst,
 847                               ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ?
 848                               &np->daddr : NULL);
 849         if (err > 0)
 850                 err = np->recverr ? net_xmit_errno(err) : 0;
 851         release_sock(sk);
 852 out:
 853         fl6_sock_release(flowlabel);
 854         if (!err) {
 855                 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS);
 856                 return len;
 857         }
 858         return err;
 859
 860 do_confirm:
 861         dst_confirm(dst);
 862         if (!(msg->msg_flags&MSG_PROBE) || len)
 863                 goto back_from_confirm;
 864         err = 0;
 865         goto out;
 866 }
 867
 868 static int udpv6_destroy_sock(struct sock *sk)
 869 {
 870         lock_sock(sk);
 871         udp_v6_flush_pending_frames(sk);
 872         release_sock(sk);
 873
 874         inet6_destroy_sock(sk);
 875
 876         return 0;
 877 }
 878
 879 /*
 880  *      Socket option code for UDP
 881  */
 882 static int udpv6_setsockopt(struct sock *sk, int level, int optname,
 883                           char __user *optval, int optlen)
 884 {
 885         struct udp_sock *up = udp_sk(sk);
 886         int val;
 887         int err = 0;
 888
 889         if (level != SOL_UDP)
 890                 return ipv6_setsockopt(sk, level, optname, optval, optlen);
 891
 892         if(optlen<sizeof(int))
 893                 return -EINVAL;
 894
 895         if (get_user(val, (int __user *)optval))
 896                 return -EFAULT;
 897
 898         switch(optname) {
 899         case UDP_CORK:
 900                 if (val != 0) {
 901                         up->corkflag = 1;
 902                 } else {
 903                         up->corkflag = 0;
 904                         lock_sock(sk);
 905                         udp_v6_push_pending_frames(sk, up);
 906                         release_sock(sk);
 907                 }
 908                 break;
 909
 910         case UDP_ENCAP:
 911                 switch (val) {
 912                 case 0:
 913                         up->encap_type = val;
 914                         break;
 915                 default:
 916                         err = -ENOPROTOOPT;
 917                         break;
 918                 }
 919                 break;
 920
 921         default:
 922                 err = -ENOPROTOOPT;
 923                 break;
 924         };
 925
 926         return err;
 927 }
 928
 929 static int udpv6_getsockopt(struct sock *sk, int level, int optname,
 930                           char __user *optval, int __user *optlen)
 931 {
 932         struct udp_sock *up = udp_sk(sk);
 933         int val, len;
 934
 935         if (level != SOL_UDP)
 936                 return ipv6_getsockopt(sk, level, optname, optval, optlen);
 937
 938         if(get_user(len,optlen))
 939                 return -EFAULT;
 940
 941         len = min_t(unsigned int, len, sizeof(int));
 942
 943         if(len < 0)
 944                 return -EINVAL;
 945
 946         switch(optname) {
 947         case UDP_CORK:
 948                 val = up->corkflag;
 949                 break;
 950
 951         case UDP_ENCAP:
 952                 val = up->encap_type;
 953                 break;
 954
 955         default:
 956                 return -ENOPROTOOPT;
 957         };
 958
 959         if(put_user(len, optlen))
 960                 return -EFAULT;
 961         if(copy_to_user(optval, &val,len))
 962                 return -EFAULT;
 963         return 0;
 964 }
 965
 966 static struct inet6_protocol udpv6_protocol = {
 967         .handler        =       udpv6_rcv,
 968         .err_handler    =       udpv6_err,
 969         .flags          =       INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
 970 };
 971
 972 /* ------------------------------------------------------------------------ */
 973 #ifdef CONFIG_PROC_FS
 974
 975 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
 976 {
 977         struct inet_sock *inet = inet_sk(sp);
 978         struct ipv6_pinfo *np = inet6_sk(sp);
 979         struct in6_addr *dest, *src;
 980         __u16 destp, srcp;
 981
 982         dest  = &np->daddr;
 983         src   = &np->rcv_saddr;
 984         destp = ntohs(inet->dport);
 985         srcp  = ntohs(inet->sport);
 986         seq_printf(seq,
 987                    "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
 988                    "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
 989                    bucket,
 990                    src->s6_addr32[0], src->s6_addr32[1],
 991                    src->s6_addr32[2], src->s6_addr32[3], srcp,
 992                    dest->s6_addr32[0], dest->s6_addr32[1],
 993                    dest->s6_addr32[2], dest->s6_addr32[3], destp,
 994                    sp->sk_state,
 995                    atomic_read(&sp->sk_wmem_alloc),
 996                    atomic_read(&sp->sk_rmem_alloc),
 997                    0, 0L, 0,
 998                    sock_i_uid(sp), 0,
 999                    sock_i_ino(sp),
1000                    atomic_read(&sp->sk_refcnt), sp);
1001 }
1002
1003 static int udp6_seq_show(struct seq_file *seq, void *v)
1004 {
1005         if (v == SEQ_START_TOKEN)
1006                 seq_printf(seq,
1007                            "  sl  "
1008                            "local_address                         "
1009                            "remote_address                        "
1010                            "st tx_queue rx_queue tr tm->when retrnsmt"
1011                            "   uid  timeout inode\n");
1012         else
1013                 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1014         return 0;
1015 }
1016
1017 static struct file_operations udp6_seq_fops;
1018 static struct udp_seq_afinfo udp6_seq_afinfo = {
1019         .owner          = THIS_MODULE,
1020         .name           = "udp6",
1021         .family         = AF_INET6,
1022         .seq_show       = udp6_seq_show,
1023         .seq_fops       = &udp6_seq_fops,
1024 };
1025
1026 int __init udp6_proc_init(void)
1027 {
1028         return udp_proc_register(&udp6_seq_afinfo);
1029 }
1030
1031 void udp6_proc_exit(void) {
1032         udp_proc_unregister(&udp6_seq_afinfo);
1033 }
1034 #endif /* CONFIG_PROC_FS */
1035
1036 /* ------------------------------------------------------------------------ */
1037
1038 struct proto udpv6_prot = {
1039         .name =         "UDPv6",
1040         .owner =        THIS_MODULE,
1041         .close =        udpv6_close,
1042         .connect =      ip6_datagram_connect,
1043         .disconnect =   udp_disconnect,
1044         .ioctl =        udp_ioctl,
1045         .destroy =      udpv6_destroy_sock,
1046         .setsockopt =   udpv6_setsockopt,
1047         .getsockopt =   udpv6_getsockopt,
1048         .sendmsg =      udpv6_sendmsg,
1049         .recvmsg =      udpv6_recvmsg,
1050         .backlog_rcv =  udpv6_queue_rcv_skb,
1051         .hash =         udp_v6_hash,
1052         .unhash =       udp_v6_unhash,
1053         .get_port =     udp_v6_get_port,
1054         .obj_size =     sizeof(struct udp6_sock),
1055 };
1056
1057 extern struct proto_ops inet6_dgram_ops;
1058
1059 static struct inet_protosw udpv6_protosw = {
1060         .type =      SOCK_DGRAM,
1061         .protocol =  IPPROTO_UDP,
1062         .prot =      &udpv6_prot,
1063         .ops =       &inet6_dgram_ops,
1064         .capability =-1,
1065         .no_check =  UDP_CSUM_DEFAULT,
1066         .flags =     INET_PROTOSW_PERMANENT,
1067 };
1068
1069
1070 void __init udpv6_init(void)
1071 {
1072         if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1073                 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1074         inet6_register_protosw(&udpv6_protosw);
1075 }