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 <linux/skbuff.h>
  40 #include <asm/uaccess.h>
  41
  42 #include <net/sock.h>
  43 #include <net/snmp.h>
  44
  45 #include <net/ipv6.h>
  46 #include <net/ndisc.h>
  47 #include <net/protocol.h>
  48 #include <net/transp_v6.h>
  49 #include <net/ip6_route.h>
  50 #include <net/addrconf.h>
  51 #include <net/ip.h>
  52 #include <net/udp.h>
  53 #include <net/raw.h>
  54 #include <net/inet_common.h>
  55 #include <net/tcp_states.h>
  56
  57 #include <net/ip6_checksum.h>
  58 #include <net/xfrm.h>
  59
  60 #include <linux/proc_fs.h>
  61 #include <linux/seq_file.h>
  62
  63 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
  64
  65 /* Grrr, addr_type already calculated by caller, but I don't want
  66  * to add some silly "cookie" argument to this method just for that.
  67  */
  68 static int udp_v6_get_port(struct sock *sk, unsigned short snum)
  69 {
  70         struct sock *sk2;
  71         struct hlist_node *node;
  72
  73         write_lock_bh(&udp_hash_lock);
  74         if (snum == 0) {
  75                 int best_size_so_far, best, result, i;
  76
  77                 if (udp_port_rover > sysctl_local_port_range[1] ||
  78                     udp_port_rover < sysctl_local_port_range[0])
  79                         udp_port_rover = sysctl_local_port_range[0];
  80                 best_size_so_far = 32767;
  81                 best = result = udp_port_rover;
  82                 for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) {
  83                         int size;
  84                         struct hlist_head *list;
  85
  86                         list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)];
  87                         if (hlist_empty(list)) {
  88                                 if (result > sysctl_local_port_range[1])
  89                                         result = sysctl_local_port_range[0] +
  90                                                 ((result - sysctl_local_port_range[0]) &
  91                                                  (UDP_HTABLE_SIZE - 1));
  92                                 goto gotit;
  93                         }
  94                         size = 0;
  95                         sk_for_each(sk2, node, list)
  96                                 if (++size >= best_size_so_far)
  97                                         goto next;
  98                         best_size_so_far = size;
  99                         best = result;
 100                 next:;
 101                 }
 102                 result = best;
 103                 for(i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++, result += UDP_HTABLE_SIZE) {
 104                         if (result > sysctl_local_port_range[1])
 105                                 result = sysctl_local_port_range[0]
 106                                         + ((result - sysctl_local_port_range[0]) &
 107                                            (UDP_HTABLE_SIZE - 1));
 108                         if (!udp_lport_inuse(result))
 109                                 break;
 110                 }
 111                 if (i >= (1 << 16) / UDP_HTABLE_SIZE)
 112                         goto fail;
 113 gotit:
 114                 udp_port_rover = snum = result;
 115         } else {
 116                 sk_for_each(sk2, node,
 117                             &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) {
 118                         if (inet_sk(sk2)->num == snum &&
 119                             sk2 != sk &&
 120                             (!sk2->sk_bound_dev_if ||
 121                              !sk->sk_bound_dev_if ||
 122                              sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
 123                             (!sk2->sk_reuse || !sk->sk_reuse) &&
 124                             ipv6_rcv_saddr_equal(sk, sk2))
 125                                 goto fail;
 126                 }
 127         }
 128
 129         inet_sk(sk)->num = snum;
 130         if (sk_unhashed(sk)) {
 131                 sk_add_node(sk, &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]);
 132                 sock_prot_inc_use(sk->sk_prot);
 133         }
 134         write_unlock_bh(&udp_hash_lock);
 135         return 0;
 136
 137 fail:
 138         write_unlock_bh(&udp_hash_lock);
 139         return 1;
 140 }
 141
 142 static void udp_v6_hash(struct sock *sk)
 143 {
 144         BUG();
 145 }
 146
 147 static void udp_v6_unhash(struct sock *sk)
 148 {
 149         write_lock_bh(&udp_hash_lock);
 150         if (sk_del_node_init(sk)) {
 151                 inet_sk(sk)->num = 0;
 152                 sock_prot_dec_use(sk->sk_prot);
 153         }
 154         write_unlock_bh(&udp_hash_lock);
 155 }
 156
 157 static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport,
 158                                   struct in6_addr *daddr, u16 dport, int dif)
 159 {
 160         struct sock *sk, *result = NULL;
 161         struct hlist_node *node;
 162         unsigned short hnum = ntohs(dport);
 163         int badness = -1;
 164
 165         read_lock(&udp_hash_lock);
 166         sk_for_each(sk, node, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) {
 167                 struct inet_sock *inet = inet_sk(sk);
 168
 169                 if (inet->num == hnum && sk->sk_family == PF_INET6) {
 170                         struct ipv6_pinfo *np = inet6_sk(sk);
 171                         int score = 0;
 172                         if (inet->dport) {
 173                                 if (inet->dport != sport)
 174                                         continue;
 175                                 score++;
 176                         }
 177                         if (!ipv6_addr_any(&np->rcv_saddr)) {
 178                                 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
 179                                         continue;
 180                                 score++;
 181                         }
 182                         if (!ipv6_addr_any(&np->daddr)) {
 183                                 if (!ipv6_addr_equal(&np->daddr, saddr))
 184                                         continue;
 185                                 score++;
 186                         }
 187                         if (sk->sk_bound_dev_if) {
 188                                 if (sk->sk_bound_dev_if != dif)
 189                                         continue;
 190                                 score++;
 191                         }
 192                         if(score == 4) {
 193                                 result = sk;
 194                                 break;
 195                         } else if(score > badness) {
 196                                 result = sk;
 197                                 badness = score;
 198                         }
 199                 }
 200         }
 201         if (result)
 202                 sock_hold(result);
 203         read_unlock(&udp_hash_lock);
 204         return result;
 205 }
 206
 207 /*
 208  *
 209  */
 210
 211 static void udpv6_close(struct sock *sk, long timeout)
 212 {
 213         sk_common_release(sk);
 214 }
 215
 216 /*
 217  *      This should be easy, if there is something there we
 218  *      return it, otherwise we block.
 219  */
 220
 221 static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
 222                   struct msghdr *msg, size_t len,
 223                   int noblock, int flags, int *addr_len)
 224 {
 225         struct ipv6_pinfo *np = inet6_sk(sk);
 226         struct inet_sock *inet = inet_sk(sk);
 227         struct sk_buff *skb;
 228         size_t copied;
 229         int err;
 230
 231         if (addr_len)
 232                 *addr_len=sizeof(struct sockaddr_in6);
 233
 234         if (flags & MSG_ERRQUEUE)
 235                 return ipv6_recv_error(sk, msg, len);
 236
 237 try_again:
 238         skb = skb_recv_datagram(sk, flags, noblock, &err);
 239         if (!skb)
 240                 goto out;
 241
 242         copied = skb->len - sizeof(struct udphdr);
 243         if (copied > len) {
 244                 copied = len;
 245                 msg->msg_flags |= MSG_TRUNC;
 246         }
 247
 248         if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
 249                 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
 250                                               copied);
 251         } else if (msg->msg_flags&MSG_TRUNC) {
 252                 if (__skb_checksum_complete(skb))
 253                         goto csum_copy_err;
 254                 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
 255                                               copied);
 256         } else {
 257                 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
 258                 if (err == -EINVAL)
 259                         goto csum_copy_err;
 260         }
 261         if (err)
 262                 goto out_free;
 263
 264         sock_recv_timestamp(msg, sk, skb);
 265
 266         /* Copy the address. */
 267         if (msg->msg_name) {
 268                 struct sockaddr_in6 *sin6;
 269
 270                 sin6 = (struct sockaddr_in6 *) msg->msg_name;
 271                 sin6->sin6_family = AF_INET6;
 272                 sin6->sin6_port = skb->h.uh->source;
 273                 sin6->sin6_flowinfo = 0;
 274                 sin6->sin6_scope_id = 0;
 275
 276                 if (skb->protocol == htons(ETH_P_IP))
 277                         ipv6_addr_set(&sin6->sin6_addr, 0, 0,
 278                                       htonl(0xffff), skb->nh.iph->saddr);
 279                 else {
 280                         ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
 281                         if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 282                                 sin6->sin6_scope_id = IP6CB(skb)->iif;
 283                 }
 284
 285         }
 286         if (skb->protocol == htons(ETH_P_IP)) {
 287                 if (inet->cmsg_flags)
 288                         ip_cmsg_recv(msg, skb);
 289         } else {
 290                 if (np->rxopt.all)
 291                         datagram_recv_ctl(sk, msg, skb);
 292         }
 293
 294         err = copied;
 295         if (flags & MSG_TRUNC)
 296                 err = skb->len - sizeof(struct udphdr);
 297
 298 out_free:
 299         skb_free_datagram(sk, skb);
 300 out:
 301         return err;
 302
 303 csum_copy_err:
 304         skb_kill_datagram(sk, skb, flags);
 305
 306         if (flags & MSG_DONTWAIT) {
 307                 UDP6_INC_STATS_USER(UDP_MIB_INERRORS);
 308                 return -EAGAIN;
 309         }
 310         goto try_again;
 311 }
 312
 313 static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 314                int type, int code, int offset, __u32 info)
 315 {
 316         struct ipv6_pinfo *np;
 317         struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
 318         struct net_device *dev = skb->dev;
 319         struct in6_addr *saddr = &hdr->saddr;
 320         struct in6_addr *daddr = &hdr->daddr;
 321         struct udphdr *uh = (struct udphdr*)(skb->data+offset);
 322         struct sock *sk;
 323         int err;
 324
 325         sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex);
 326
 327         if (sk == NULL)
 328                 return;
 329
 330         np = inet6_sk(sk);
 331
 332         if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
 333                 goto out;
 334
 335         if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
 336                 goto out;
 337
 338         if (np->recverr)
 339                 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
 340
 341         sk->sk_err = err;
 342         sk->sk_error_report(sk);
 343 out:
 344         sock_put(sk);
 345 }
 346
 347 static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
 348 {
 349         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
 350                 kfree_skb(skb);
 351                 return -1;
 352         }
 353
 354         if (skb_checksum_complete(skb)) {
 355                 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
 356                 kfree_skb(skb);
 357                 return 0;
 358         }
 359
 360         if (sock_queue_rcv_skb(sk,skb)<0) {
 361                 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
 362                 kfree_skb(skb);
 363                 return 0;
 364         }
 365         UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
 366         return 0;
 367 }
 368
 369 static struct sock *udp_v6_mcast_next(struct sock *sk,
 370                                       u16 loc_port, struct in6_addr *loc_addr,
 371                                       u16 rmt_port, struct in6_addr *rmt_addr,
 372                                       int dif)
 373 {
 374         struct hlist_node *node;
 375         struct sock *s = sk;
 376         unsigned short num = ntohs(loc_port);
 377
 378         sk_for_each_from(s, node) {
 379                 struct inet_sock *inet = inet_sk(s);
 380
 381                 if (inet->num == num && s->sk_family == PF_INET6) {
 382                         struct ipv6_pinfo *np = inet6_sk(s);
 383                         if (inet->dport) {
 384                                 if (inet->dport != rmt_port)
 385                                         continue;
 386                         }
 387                         if (!ipv6_addr_any(&np->daddr) &&
 388                             !ipv6_addr_equal(&np->daddr, rmt_addr))
 389                                 continue;
 390
 391                         if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
 392                                 continue;
 393
 394                         if (!ipv6_addr_any(&np->rcv_saddr)) {
 395                                 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
 396                                         continue;
 397                         }
 398                         if(!inet6_mc_check(s, loc_addr, rmt_addr))
 399                                 continue;
 400                         return s;
 401                 }
 402         }
 403         return NULL;
 404 }
 405
 406 /*
 407  * Note: called only from the BH handler context,
 408  * so we don't need to lock the hashes.
 409  */
 410 static void udpv6_mcast_deliver(struct udphdr *uh,
 411                                 struct in6_addr *saddr, struct in6_addr *daddr,
 412                                 struct sk_buff *skb)
 413 {
 414         struct sock *sk, *sk2;
 415         int dif;
 416
 417         read_lock(&udp_hash_lock);
 418         sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
 419         dif = skb->dev->ifindex;
 420         sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
 421         if (!sk) {
 422                 kfree_skb(skb);
 423                 goto out;
 424         }
 425
 426         sk2 = sk;
 427         while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
 428                                         uh->source, saddr, dif))) {
 429                 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
 430                 if (buff)
 431                         udpv6_queue_rcv_skb(sk2, buff);
 432         }
 433         udpv6_queue_rcv_skb(sk, skb);
 434 out:
 435         read_unlock(&udp_hash_lock);
 436 }
 437
 438 static int udpv6_rcv(struct sk_buff **pskb)
 439 {
 440         struct sk_buff *skb = *pskb;
 441         struct sock *sk;
 442         struct udphdr *uh;
 443         struct net_device *dev = skb->dev;
 444         struct in6_addr *saddr, *daddr;
 445         u32 ulen = 0;
 446
 447         if (!pskb_may_pull(skb, sizeof(struct udphdr)))
 448                 goto short_packet;
 449
 450         saddr = &skb->nh.ipv6h->saddr;
 451         daddr = &skb->nh.ipv6h->daddr;
 452         uh = skb->h.uh;
 453
 454         ulen = ntohs(uh->len);
 455
 456         /* Check for jumbo payload */
 457         if (ulen == 0)
 458                 ulen = skb->len;
 459
 460         if (ulen > skb->len || ulen < sizeof(*uh))
 461                 goto short_packet;
 462
 463         if (uh->check == 0) {
 464                 /* RFC 2460 section 8.1 says that we SHOULD log
 465                    this error. Well, it is reasonable.
 466                  */
 467                 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
 468                 goto discard;
 469         }
 470
 471         if (ulen < skb->len) {
 472                 if (pskb_trim_rcsum(skb, ulen))
 473                         goto discard;
 474                 saddr = &skb->nh.ipv6h->saddr;
 475                 daddr = &skb->nh.ipv6h->daddr;
 476                 uh = skb->h.uh;
 477         }
 478
 479         if (skb->ip_summed == CHECKSUM_HW &&
 480             !csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum))
 481                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 482
 483         if (skb->ip_summed != CHECKSUM_UNNECESSARY)
 484                 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
 485
 486         /*
 487          *      Multicast receive code
 488          */
 489         if (ipv6_addr_is_multicast(daddr)) {
 490                 udpv6_mcast_deliver(uh, saddr, daddr, skb);
 491                 return 0;
 492         }
 493
 494         /* Unicast */
 495
 496         /*
 497          * check socket cache ... must talk to Alan about his plans
 498          * for sock caches... i'll skip this for now.
 499          */
 500         sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
 501
 502         if (sk == NULL) {
 503                 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 504                         goto discard;
 505
 506                 if (skb_checksum_complete(skb))
 507                         goto discard;
 508                 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);
 509
 510                 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
 511
 512                 kfree_skb(skb);
 513                 return(0);
 514         }
 515
 516         /* deliver */
 517
 518         udpv6_queue_rcv_skb(sk, skb);
 519         sock_put(sk);
 520         return(0);
 521
 522 short_packet:
 523         if (net_ratelimit())
 524                 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
 525
 526 discard:
 527         UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
 528         kfree_skb(skb);
 529         return(0);
 530 }
 531 /*
 532  * Throw away all pending data and cancel the corking. Socket is locked.
 533  */
 534 static void udp_v6_flush_pending_frames(struct sock *sk)
 535 {
 536         struct udp_sock *up = udp_sk(sk);
 537
 538         if (up->pending) {
 539                 up->len = 0;
 540                 up->pending = 0;
 541                 ip6_flush_pending_frames(sk);
 542         }
 543 }
 544
 545 /*
 546  *      Sending
 547  */
 548
 549 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
 550 {
 551         struct sk_buff *skb;
 552         struct udphdr *uh;
 553         struct inet_sock *inet = inet_sk(sk);
 554         struct flowi *fl = &inet->cork.fl;
 555         int err = 0;
 556
 557         /* Grab the skbuff where UDP header space exists. */
 558         if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
 559                 goto out;
 560
 561         /*
 562          * Create a UDP header
 563          */
 564         uh = skb->h.uh;
 565         uh->source = fl->fl_ip_sport;
 566         uh->dest = fl->fl_ip_dport;
 567         uh->len = htons(up->len);
 568         uh->check = 0;
 569
 570         if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
 571                 skb->ip_summed = CHECKSUM_NONE;
 572                 goto send;
 573         }
 574
 575         if (skb_queue_len(&sk->sk_write_queue) == 1) {
 576                 skb->csum = csum_partial((char *)uh,
 577                                 sizeof(struct udphdr), skb->csum);
 578                 uh->check = csum_ipv6_magic(&fl->fl6_src,
 579                                             &fl->fl6_dst,
 580                                             up->len, fl->proto, skb->csum);
 581         } else {
 582                 u32 tmp_csum = 0;
 583
 584                 skb_queue_walk(&sk->sk_write_queue, skb) {
 585                         tmp_csum = csum_add(tmp_csum, skb->csum);
 586                 }
 587                 tmp_csum = csum_partial((char *)uh,
 588                                 sizeof(struct udphdr), tmp_csum);
 589                 tmp_csum = csum_ipv6_magic(&fl->fl6_src,
 590                                            &fl->fl6_dst,
 591                                            up->len, fl->proto, tmp_csum);
 592                 uh->check = tmp_csum;
 593
 594         }
 595         if (uh->check == 0)
 596                 uh->check = -1;
 597
 598 send:
 599         err = ip6_push_pending_frames(sk);
 600 out:
 601         up->len = 0;
 602         up->pending = 0;
 603         return err;
 604 }
 605
 606 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
 607                   struct msghdr *msg, size_t len)
 608 {
 609         struct ipv6_txoptions opt_space;
 610         struct udp_sock *up = udp_sk(sk);
 611         struct inet_sock *inet = inet_sk(sk);
 612         struct ipv6_pinfo *np = inet6_sk(sk);
 613         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
 614         struct in6_addr *daddr, *final_p = NULL, final;
 615         struct ipv6_txoptions *opt = NULL;
 616         struct ip6_flowlabel *flowlabel = NULL;
 617         struct flowi *fl = &inet->cork.fl;
 618         struct dst_entry *dst;
 619         int addr_len = msg->msg_namelen;
 620         int ulen = len;
 621         int hlimit = -1;
 622         int tclass = -1;
 623         int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
 624         int err;
 625         int connected = 0;
 626
 627         /* destination address check */
 628         if (sin6) {
 629                 if (addr_len < offsetof(struct sockaddr, sa_data))
 630                         return -EINVAL;
 631
 632                 switch (sin6->sin6_family) {
 633                 case AF_INET6:
 634                         if (addr_len < SIN6_LEN_RFC2133)
 635                                 return -EINVAL;
 636                         daddr = &sin6->sin6_addr;
 637                         break;
 638                 case AF_INET:
 639                         goto do_udp_sendmsg;
 640                 case AF_UNSPEC:
 641                         msg->msg_name = sin6 = NULL;
 642                         msg->msg_namelen = addr_len = 0;
 643                         daddr = NULL;
 644                         break;
 645                 default:
 646                         return -EINVAL;
 647                 }
 648         } else if (!up->pending) {
 649                 if (sk->sk_state != TCP_ESTABLISHED)
 650                         return -EDESTADDRREQ;
 651                 daddr = &np->daddr;
 652         } else
 653                 daddr = NULL;
 654
 655         if (daddr) {
 656                 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
 657                         struct sockaddr_in sin;
 658                         sin.sin_family = AF_INET;
 659                         sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
 660                         sin.sin_addr.s_addr = daddr->s6_addr32[3];
 661                         msg->msg_name = &sin;
 662                         msg->msg_namelen = sizeof(sin);
 663 do_udp_sendmsg:
 664                         if (__ipv6_only_sock(sk))
 665                                 return -ENETUNREACH;
 666                         return udp_sendmsg(iocb, sk, msg, len);
 667                 }
 668         }
 669
 670         if (up->pending == AF_INET)
 671                 return udp_sendmsg(iocb, sk, msg, len);
 672
 673         /* Rough check on arithmetic overflow,
 674            better check is made in ip6_build_xmit
 675            */
 676         if (len > INT_MAX - sizeof(struct udphdr))
 677                 return -EMSGSIZE;
 678
 679         if (up->pending) {
 680                 /*
 681                  * There are pending frames.
 682                  * The socket lock must be held while it's corked.
 683                  */
 684                 lock_sock(sk);
 685                 if (likely(up->pending)) {
 686                         if (unlikely(up->pending != AF_INET6)) {
 687                                 release_sock(sk);
 688                                 return -EAFNOSUPPORT;
 689                         }
 690                         dst = NULL;
 691                         goto do_append_data;
 692                 }
 693                 release_sock(sk);
 694         }
 695         ulen += sizeof(struct udphdr);
 696
 697         memset(fl, 0, sizeof(*fl));
 698
 699         if (sin6) {
 700                 if (sin6->sin6_port == 0)
 701                         return -EINVAL;
 702
 703                 fl->fl_ip_dport = sin6->sin6_port;
 704                 daddr = &sin6->sin6_addr;
 705
 706                 if (np->sndflow) {
 707                         fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
 708                         if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
 709                                 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
 710                                 if (flowlabel == NULL)
 711                                         return -EINVAL;
 712                                 daddr = &flowlabel->dst;
 713                         }
 714                 }
 715
 716                 /*
 717                  * Otherwise it will be difficult to maintain
 718                  * sk->sk_dst_cache.
 719                  */
 720                 if (sk->sk_state == TCP_ESTABLISHED &&
 721                     ipv6_addr_equal(daddr, &np->daddr))
 722                         daddr = &np->daddr;
 723
 724                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 725                     sin6->sin6_scope_id &&
 726                     ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
 727                         fl->oif = sin6->sin6_scope_id;
 728         } else {
 729                 if (sk->sk_state != TCP_ESTABLISHED)
 730                         return -EDESTADDRREQ;
 731
 732                 fl->fl_ip_dport = inet->dport;
 733                 daddr = &np->daddr;
 734                 fl->fl6_flowlabel = np->flow_label;
 735                 connected = 1;
 736         }
 737
 738         if (!fl->oif)
 739                 fl->oif = sk->sk_bound_dev_if;
 740
 741         if (msg->msg_controllen) {
 742                 opt = &opt_space;
 743                 memset(opt, 0, sizeof(struct ipv6_txoptions));
 744                 opt->tot_len = sizeof(*opt);
 745
 746                 err = datagram_send_ctl(msg, fl, opt, &hlimit, &tclass);
 747                 if (err < 0) {
 748                         fl6_sock_release(flowlabel);
 749                         return err;
 750                 }
 751                 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
 752                         flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
 753                         if (flowlabel == NULL)
 754                                 return -EINVAL;
 755                 }
 756                 if (!(opt->opt_nflen|opt->opt_flen))
 757                         opt = NULL;
 758                 connected = 0;
 759         }
 760         if (opt == NULL)
 761                 opt = np->opt;
 762         if (flowlabel)
 763                 opt = fl6_merge_options(&opt_space, flowlabel, opt);
 764         opt = ipv6_fixup_options(&opt_space, opt);
 765
 766         fl->proto = IPPROTO_UDP;
 767         ipv6_addr_copy(&fl->fl6_dst, daddr);
 768         if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
 769                 ipv6_addr_copy(&fl->fl6_src, &np->saddr);
 770         fl->fl_ip_sport = inet->sport;
 771
 772         /* merge ip6_build_xmit from ip6_output */
 773         if (opt && opt->srcrt) {
 774                 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
 775                 ipv6_addr_copy(&final, &fl->fl6_dst);
 776                 ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
 777                 final_p = &final;
 778                 connected = 0;
 779         }
 780
 781         if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst)) {
 782                 fl->oif = np->mcast_oif;
 783                 connected = 0;
 784         }
 785
 786         err = ip6_dst_lookup(sk, &dst, fl);
 787         if (err)
 788                 goto out;
 789         if (final_p)
 790                 ipv6_addr_copy(&fl->fl6_dst, final_p);
 791
 792         if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0)
 793                 goto out;
 794
 795         if (hlimit < 0) {
 796                 if (ipv6_addr_is_multicast(&fl->fl6_dst))
 797                         hlimit = np->mcast_hops;
 798                 else
 799                         hlimit = np->hop_limit;
 800                 if (hlimit < 0)
 801                         hlimit = dst_metric(dst, RTAX_HOPLIMIT);
 802                 if (hlimit < 0)
 803                         hlimit = ipv6_get_hoplimit(dst->dev);
 804         }
 805
 806         if (tclass < 0) {
 807                 tclass = np->tclass;
 808                 if (tclass < 0)
 809                         tclass = 0;
 810         }
 811
 812         if (msg->msg_flags&MSG_CONFIRM)
 813                 goto do_confirm;
 814 back_from_confirm:
 815
 816         lock_sock(sk);
 817         if (unlikely(up->pending)) {
 818                 /* The socket is already corked while preparing it. */
 819                 /* ... which is an evident application bug. --ANK */
 820                 release_sock(sk);
 821
 822                 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
 823                 err = -EINVAL;
 824                 goto out;
 825         }
 826
 827         up->pending = AF_INET6;
 828
 829 do_append_data:
 830         up->len += ulen;
 831         err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen,
 832                 sizeof(struct udphdr), hlimit, tclass, opt, fl,
 833                 (struct rt6_info*)dst,
 834                 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
 835         if (err)
 836                 udp_v6_flush_pending_frames(sk);
 837         else if (!corkreq)
 838                 err = udp_v6_push_pending_frames(sk, up);
 839
 840         if (dst) {
 841                 if (connected) {
 842                         ip6_dst_store(sk, dst,
 843                                       ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ?
 844                                       &np->daddr : NULL);
 845                 } else {
 846                         dst_release(dst);
 847                 }
 848         }
 849
 850         if (err > 0)
 851                 err = np->recverr ? net_xmit_errno(err) : 0;
 852         release_sock(sk);
 853 out:
 854         fl6_sock_release(flowlabel);
 855         if (!err) {
 856                 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS);
 857                 return len;
 858         }
 859         return err;
 860
 861 do_confirm:
 862         dst_confirm(dst);
 863         if (!(msg->msg_flags&MSG_PROBE) || len)
 864                 goto back_from_confirm;
 865         err = 0;
 866         goto out;
 867 }
 868
 869 static int udpv6_destroy_sock(struct sock *sk)
 870 {
 871         lock_sock(sk);
 872         udp_v6_flush_pending_frames(sk);
 873         release_sock(sk);
 874
 875         inet6_destroy_sock(sk);
 876
 877         return 0;
 878 }
 879
 880 /*
 881  *      Socket option code for UDP
 882  */
 883 static int do_udpv6_setsockopt(struct sock *sk, int level, int optname,
 884                           char __user *optval, int optlen)
 885 {
 886         struct udp_sock *up = udp_sk(sk);
 887         int val;
 888         int err = 0;
 889
 890         if(optlen<sizeof(int))
 891                 return -EINVAL;
 892
 893         if (get_user(val, (int __user *)optval))
 894                 return -EFAULT;
 895
 896         switch(optname) {
 897         case UDP_CORK:
 898                 if (val != 0) {
 899                         up->corkflag = 1;
 900                 } else {
 901                         up->corkflag = 0;
 902                         lock_sock(sk);
 903                         udp_v6_push_pending_frames(sk, up);
 904                         release_sock(sk);
 905                 }
 906                 break;
 907
 908         case UDP_ENCAP:
 909                 switch (val) {
 910                 case 0:
 911                         up->encap_type = val;
 912                         break;
 913                 default:
 914                         err = -ENOPROTOOPT;
 915                         break;
 916                 }
 917                 break;
 918
 919         default:
 920                 err = -ENOPROTOOPT;
 921                 break;
 922         };
 923
 924         return err;
 925 }
 926
 927 static int udpv6_setsockopt(struct sock *sk, int level, int optname,
 928                           char __user *optval, int optlen)
 929 {
 930         if (level != SOL_UDP)
 931                 return ipv6_setsockopt(sk, level, optname, optval, optlen);
 932         return do_udpv6_setsockopt(sk, level, optname, optval, optlen);
 933 }
 934
 935 #ifdef CONFIG_COMPAT
 936 static int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
 937                                    char __user *optval, int optlen)
 938 {
 939         if (level != SOL_UDP)
 940                 return compat_ipv6_setsockopt(sk, level, optname,
 941                                               optval, optlen);
 942         return do_udpv6_setsockopt(sk, level, optname, optval, optlen);
 943 }
 944 #endif
 945
 946 static int do_udpv6_getsockopt(struct sock *sk, int level, int optname,
 947                           char __user *optval, int __user *optlen)
 948 {
 949         struct udp_sock *up = udp_sk(sk);
 950         int val, len;
 951
 952         if(get_user(len,optlen))
 953                 return -EFAULT;
 954
 955         len = min_t(unsigned int, len, sizeof(int));
 956
 957         if(len < 0)
 958                 return -EINVAL;
 959
 960         switch(optname) {
 961         case UDP_CORK:
 962                 val = up->corkflag;
 963                 break;
 964
 965         case UDP_ENCAP:
 966                 val = up->encap_type;
 967                 break;
 968
 969         default:
 970                 return -ENOPROTOOPT;
 971         };
 972
 973         if(put_user(len, optlen))
 974                 return -EFAULT;
 975         if(copy_to_user(optval, &val,len))
 976                 return -EFAULT;
 977         return 0;
 978 }
 979
 980 static int udpv6_getsockopt(struct sock *sk, int level, int optname,
 981                           char __user *optval, int __user *optlen)
 982 {
 983         if (level != SOL_UDP)
 984                 return ipv6_getsockopt(sk, level, optname, optval, optlen);
 985         return do_udpv6_getsockopt(sk, level, optname, optval, optlen);
 986 }
 987
 988 #ifdef CONFIG_COMPAT
 989 static int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
 990                                    char __user *optval, int __user *optlen)
 991 {
 992         if (level != SOL_UDP)
 993                 return compat_ipv6_getsockopt(sk, level, optname,
 994                                               optval, optlen);
 995         return do_udpv6_getsockopt(sk, level, optname, optval, optlen);
 996 }
 997 #endif
 998
 999 static struct inet6_protocol udpv6_protocol = {
1000         .handler        =       udpv6_rcv,
1001         .err_handler    =       udpv6_err,
1002         .flags          =       INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1003 };
1004
1005 /* ------------------------------------------------------------------------ */
1006 #ifdef CONFIG_PROC_FS
1007
1008 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1009 {
1010         struct inet_sock *inet = inet_sk(sp);
1011         struct ipv6_pinfo *np = inet6_sk(sp);
1012         struct in6_addr *dest, *src;
1013         __u16 destp, srcp;
1014
1015         dest  = &np->daddr;
1016         src   = &np->rcv_saddr;
1017         destp = ntohs(inet->dport);
1018         srcp  = ntohs(inet->sport);
1019         seq_printf(seq,
1020                    "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1021                    "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
1022                    bucket,
1023                    src->s6_addr32[0], src->s6_addr32[1],
1024                    src->s6_addr32[2], src->s6_addr32[3], srcp,
1025                    dest->s6_addr32[0], dest->s6_addr32[1],
1026                    dest->s6_addr32[2], dest->s6_addr32[3], destp,
1027                    sp->sk_state,
1028                    atomic_read(&sp->sk_wmem_alloc),
1029                    atomic_read(&sp->sk_rmem_alloc),
1030                    0, 0L, 0,
1031                    sock_i_uid(sp), 0,
1032                    sock_i_ino(sp),
1033                    atomic_read(&sp->sk_refcnt), sp);
1034 }
1035
1036 static int udp6_seq_show(struct seq_file *seq, void *v)
1037 {
1038         if (v == SEQ_START_TOKEN)
1039                 seq_printf(seq,
1040                            "  sl  "
1041                            "local_address                         "
1042                            "remote_address                        "
1043                            "st tx_queue rx_queue tr tm->when retrnsmt"
1044                            "   uid  timeout inode\n");
1045         else
1046                 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1047         return 0;
1048 }
1049
1050 static struct file_operations udp6_seq_fops;
1051 static struct udp_seq_afinfo udp6_seq_afinfo = {
1052         .owner          = THIS_MODULE,
1053         .name           = "udp6",
1054         .family         = AF_INET6,
1055         .seq_show       = udp6_seq_show,
1056         .seq_fops       = &udp6_seq_fops,
1057 };
1058
1059 int __init udp6_proc_init(void)
1060 {
1061         return udp_proc_register(&udp6_seq_afinfo);
1062 }
1063
1064 void udp6_proc_exit(void) {
1065         udp_proc_unregister(&udp6_seq_afinfo);
1066 }
1067 #endif /* CONFIG_PROC_FS */
1068
1069 /* ------------------------------------------------------------------------ */
1070
1071 struct proto udpv6_prot = {
1072         .name              = "UDPv6",
1073         .owner             = THIS_MODULE,
1074         .close             = udpv6_close,
1075         .connect           = ip6_datagram_connect,
1076         .disconnect        = udp_disconnect,
1077         .ioctl             = udp_ioctl,
1078         .destroy           = udpv6_destroy_sock,
1079         .setsockopt        = udpv6_setsockopt,
1080         .getsockopt        = udpv6_getsockopt,
1081         .sendmsg           = udpv6_sendmsg,
1082         .recvmsg           = udpv6_recvmsg,
1083         .backlog_rcv       = udpv6_queue_rcv_skb,
1084         .hash              = udp_v6_hash,
1085         .unhash            = udp_v6_unhash,
1086         .get_port          = udp_v6_get_port,
1087         .obj_size          = sizeof(struct udp6_sock),
1088 #ifdef CONFIG_COMPAT
1089         .compat_setsockopt = compat_udpv6_setsockopt,
1090         .compat_getsockopt = compat_udpv6_getsockopt,
1091 #endif
1092 };
1093
1094 static struct inet_protosw udpv6_protosw = {
1095         .type =      SOCK_DGRAM,
1096         .protocol =  IPPROTO_UDP,
1097         .prot =      &udpv6_prot,
1098         .ops =       &inet6_dgram_ops,
1099         .capability =-1,
1100         .no_check =  UDP_CSUM_DEFAULT,
1101         .flags =     INET_PROTOSW_PERMANENT,
1102 };
1103
1104
1105 void __init udpv6_init(void)
1106 {
1107         if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1108                 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1109         inet6_register_protosw(&udpv6_protosw);
1110 }