net/ipv6/datagram.c

   1 /*
   2  *      common UDP/RAW code
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      $Id: datagram.c,v 1.24 2002/02/01 22:01:04 davem Exp $
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 #include <linux/capability.h>
  17 #include <linux/errno.h>
  18 #include <linux/types.h>
  19 #include <linux/kernel.h>
  20 #include <linux/sched.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/socket.h>
  23 #include <linux/sockios.h>
  24 #include <linux/in6.h>
  25 #include <linux/ipv6.h>
  26 #include <linux/route.h>
  27
  28 #include <net/ipv6.h>
  29 #include <net/ndisc.h>
  30 #include <net/addrconf.h>
  31 #include <net/transp_v6.h>
  32 #include <net/ip6_route.h>
  33 #include <net/tcp_states.h>
  34
  35 #include <linux/errqueue.h>
  36 #include <asm/uaccess.h>
  37
  38 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
  39 {
  40         struct sockaddr_in6     *usin = (struct sockaddr_in6 *) uaddr;
  41         struct inet_sock        *inet = inet_sk(sk);
  42         struct ipv6_pinfo       *np = inet6_sk(sk);
  43         struct in6_addr         *daddr, *final_p = NULL, final;
  44         struct dst_entry        *dst;
  45         struct flowi            fl;
  46         struct ip6_flowlabel    *flowlabel = NULL;
  47         int                     addr_type;
  48         int                     err;
  49
  50         if (usin->sin6_family == AF_INET) {
  51                 if (__ipv6_only_sock(sk))
  52                         return -EAFNOSUPPORT;
  53                 err = ip4_datagram_connect(sk, uaddr, addr_len);
  54                 goto ipv4_connected;
  55         }
  56
  57         if (addr_len < SIN6_LEN_RFC2133)
  58                 return -EINVAL;
  59
  60         if (usin->sin6_family != AF_INET6)
  61                 return -EAFNOSUPPORT;
  62
  63         memset(&fl, 0, sizeof(fl));
  64         if (np->sndflow) {
  65                 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
  66                 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
  67                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
  68                         if (flowlabel == NULL)
  69                                 return -EINVAL;
  70                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
  71                 }
  72         }
  73
  74         addr_type = ipv6_addr_type(&usin->sin6_addr);
  75
  76         if (addr_type == IPV6_ADDR_ANY) {
  77                 /*
  78                  *      connect to self
  79                  */
  80                 usin->sin6_addr.s6_addr[15] = 0x01;
  81         }
  82
  83         daddr = &usin->sin6_addr;
  84
  85         if (addr_type == IPV6_ADDR_MAPPED) {
  86                 struct sockaddr_in sin;
  87
  88                 if (__ipv6_only_sock(sk)) {
  89                         err = -ENETUNREACH;
  90                         goto out;
  91                 }
  92                 sin.sin_family = AF_INET;
  93                 sin.sin_addr.s_addr = daddr->s6_addr32[3];
  94                 sin.sin_port = usin->sin6_port;
  95
  96                 err = ip4_datagram_connect(sk,
  97                                            (struct sockaddr*) &sin,
  98                                            sizeof(sin));
  99
 100 ipv4_connected:
 101                 if (err)
 102                         goto out;
 103
 104                 ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr);
 105
 106                 if (ipv6_addr_any(&np->saddr)) {
 107                         ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff),
 108                                       inet->saddr);
 109                 }
 110
 111                 if (ipv6_addr_any(&np->rcv_saddr)) {
 112                         ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff),
 113                                       inet->rcv_saddr);
 114                 }
 115                 goto out;
 116         }
 117
 118         if (addr_type&IPV6_ADDR_LINKLOCAL) {
 119                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 120                     usin->sin6_scope_id) {
 121                         if (sk->sk_bound_dev_if &&
 122                             sk->sk_bound_dev_if != usin->sin6_scope_id) {
 123                                 err = -EINVAL;
 124                                 goto out;
 125                         }
 126                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 127                         if (!sk->sk_bound_dev_if &&
 128                             (addr_type & IPV6_ADDR_MULTICAST))
 129                                 fl.oif = np->mcast_oif;
 130                 }
 131
 132                 /* Connect to link-local address requires an interface */
 133                 if (!sk->sk_bound_dev_if) {
 134                         err = -EINVAL;
 135                         goto out;
 136                 }
 137         }
 138
 139         ipv6_addr_copy(&np->daddr, daddr);
 140         np->flow_label = fl.fl6_flowlabel;
 141
 142         inet->dport = usin->sin6_port;
 143
 144         /*
 145          *      Check for a route to destination an obtain the
 146          *      destination cache for it.
 147          */
 148
 149         fl.proto = sk->sk_protocol;
 150         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 151         ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 152         fl.oif = sk->sk_bound_dev_if;
 153         fl.fl_ip_dport = inet->dport;
 154         fl.fl_ip_sport = inet->sport;
 155
 156         if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
 157                 fl.oif = np->mcast_oif;
 158
 159         security_sk_classify_flow(sk, &fl);
 160
 161         if (flowlabel) {
 162                 if (flowlabel->opt && flowlabel->opt->srcrt) {
 163                         struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt;
 164                         ipv6_addr_copy(&final, &fl.fl6_dst);
 165                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 166                         final_p = &final;
 167                 }
 168         } else if (np->opt && np->opt->srcrt) {
 169                 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
 170                 ipv6_addr_copy(&final, &fl.fl6_dst);
 171                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 172                 final_p = &final;
 173         }
 174
 175         err = ip6_dst_lookup(sk, &dst, &fl);
 176         if (err)
 177                 goto out;
 178         if (final_p)
 179                 ipv6_addr_copy(&fl.fl6_dst, final_p);
 180
 181         if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
 182                 goto out;
 183
 184         /* source address lookup done in ip6_dst_lookup */
 185
 186         if (ipv6_addr_any(&np->saddr))
 187                 ipv6_addr_copy(&np->saddr, &fl.fl6_src);
 188
 189         if (ipv6_addr_any(&np->rcv_saddr)) {
 190                 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
 191                 inet->rcv_saddr = LOOPBACK4_IPV6;
 192         }
 193
 194         ip6_dst_store(sk, dst,
 195                       ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
 196                       &np->daddr : NULL);
 197
 198         sk->sk_state = TCP_ESTABLISHED;
 199 out:
 200         fl6_sock_release(flowlabel);
 201         return err;
 202 }
 203
 204 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
 205                      u16 port, u32 info, u8 *payload)
 206 {
 207         struct ipv6_pinfo *np  = inet6_sk(sk);
 208         struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw;
 209         struct sock_exterr_skb *serr;
 210
 211         if (!np->recverr)
 212                 return;
 213
 214         skb = skb_clone(skb, GFP_ATOMIC);
 215         if (!skb)
 216                 return;
 217
 218         serr = SKB_EXT_ERR(skb);
 219         serr->ee.ee_errno = err;
 220         serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
 221         serr->ee.ee_type = icmph->icmp6_type;
 222         serr->ee.ee_code = icmph->icmp6_code;
 223         serr->ee.ee_pad = 0;
 224         serr->ee.ee_info = info;
 225         serr->ee.ee_data = 0;
 226         serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw;
 227         serr->port = port;
 228
 229         skb->h.raw = payload;
 230         __skb_pull(skb, payload - skb->data);
 231
 232         if (sock_queue_err_skb(sk, skb))
 233                 kfree_skb(skb);
 234 }
 235
 236 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
 237 {
 238         struct ipv6_pinfo *np = inet6_sk(sk);
 239         struct sock_exterr_skb *serr;
 240         struct ipv6hdr *iph;
 241         struct sk_buff *skb;
 242
 243         if (!np->recverr)
 244                 return;
 245
 246         skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
 247         if (!skb)
 248                 return;
 249
 250         iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr));
 251         skb->nh.ipv6h = iph;
 252         ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
 253
 254         serr = SKB_EXT_ERR(skb);
 255         serr->ee.ee_errno = err;
 256         serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
 257         serr->ee.ee_type = 0;
 258         serr->ee.ee_code = 0;
 259         serr->ee.ee_pad = 0;
 260         serr->ee.ee_info = info;
 261         serr->ee.ee_data = 0;
 262         serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
 263         serr->port = fl->fl_ip_dport;
 264
 265         skb->h.raw = skb->tail;
 266         __skb_pull(skb, skb->tail - skb->data);
 267
 268         if (sock_queue_err_skb(sk, skb))
 269                 kfree_skb(skb);
 270 }
 271
 272 /*
 273  *      Handle MSG_ERRQUEUE
 274  */
 275 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
 276 {
 277         struct ipv6_pinfo *np = inet6_sk(sk);
 278         struct sock_exterr_skb *serr;
 279         struct sk_buff *skb, *skb2;
 280         struct sockaddr_in6 *sin;
 281         struct {
 282                 struct sock_extended_err ee;
 283                 struct sockaddr_in6      offender;
 284         } errhdr;
 285         int err;
 286         int copied;
 287
 288         err = -EAGAIN;
 289         skb = skb_dequeue(&sk->sk_error_queue);
 290         if (skb == NULL)
 291                 goto out;
 292
 293         copied = skb->len;
 294         if (copied > len) {
 295                 msg->msg_flags |= MSG_TRUNC;
 296                 copied = len;
 297         }
 298         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 299         if (err)
 300                 goto out_free_skb;
 301
 302         sock_recv_timestamp(msg, sk, skb);
 303
 304         serr = SKB_EXT_ERR(skb);
 305
 306         sin = (struct sockaddr_in6 *)msg->msg_name;
 307         if (sin) {
 308                 sin->sin6_family = AF_INET6;
 309                 sin->sin6_flowinfo = 0;
 310                 sin->sin6_port = serr->port;
 311                 sin->sin6_scope_id = 0;
 312                 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
 313                         ipv6_addr_copy(&sin->sin6_addr,
 314                           (struct in6_addr *)(skb->nh.raw + serr->addr_offset));
 315                         if (np->sndflow)
 316                                 sin->sin6_flowinfo = *(u32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK;
 317                         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 318                                 sin->sin6_scope_id = IP6CB(skb)->iif;
 319                 } else {
 320                         ipv6_addr_set(&sin->sin6_addr, 0, 0,
 321                                       htonl(0xffff),
 322                                       *(u32*)(skb->nh.raw + serr->addr_offset));
 323                 }
 324         }
 325
 326         memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
 327         sin = &errhdr.offender;
 328         sin->sin6_family = AF_UNSPEC;
 329         if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
 330                 sin->sin6_family = AF_INET6;
 331                 sin->sin6_flowinfo = 0;
 332                 sin->sin6_scope_id = 0;
 333                 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
 334                         ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr);
 335                         if (np->rxopt.all)
 336                                 datagram_recv_ctl(sk, msg, skb);
 337                         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 338                                 sin->sin6_scope_id = IP6CB(skb)->iif;
 339                 } else {
 340                         struct inet_sock *inet = inet_sk(sk);
 341
 342                         ipv6_addr_set(&sin->sin6_addr, 0, 0,
 343                                       htonl(0xffff),
 344                                       skb->nh.iph->saddr);
 345                         if (inet->cmsg_flags)
 346                                 ip_cmsg_recv(msg, skb);
 347                 }
 348         }
 349
 350         put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
 351
 352         /* Now we could try to dump offended packet options */
 353
 354         msg->msg_flags |= MSG_ERRQUEUE;
 355         err = copied;
 356
 357         /* Reset and regenerate socket error */
 358         spin_lock_bh(&sk->sk_error_queue.lock);
 359         sk->sk_err = 0;
 360         if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
 361                 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
 362                 spin_unlock_bh(&sk->sk_error_queue.lock);
 363                 sk->sk_error_report(sk);
 364         } else {
 365                 spin_unlock_bh(&sk->sk_error_queue.lock);
 366         }
 367
 368 out_free_skb:
 369         kfree_skb(skb);
 370 out:
 371         return err;
 372 }
 373
 374
 375
 376 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
 377 {
 378         struct ipv6_pinfo *np = inet6_sk(sk);
 379         struct inet6_skb_parm *opt = IP6CB(skb);
 380
 381         if (np->rxopt.bits.rxinfo) {
 382                 struct in6_pktinfo src_info;
 383
 384                 src_info.ipi6_ifindex = opt->iif;
 385                 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
 386                 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 387         }
 388
 389         if (np->rxopt.bits.rxhlim) {
 390                 int hlim = skb->nh.ipv6h->hop_limit;
 391                 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 392         }
 393
 394         if (np->rxopt.bits.rxtclass) {
 395                 int tclass = (ntohl(*(u32 *)skb->nh.ipv6h) >> 20) & 0xff;
 396                 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
 397         }
 398
 399         if (np->rxopt.bits.rxflow && (*(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) {
 400                 u32 flowinfo = *(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK;
 401                 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
 402         }
 403
 404         /* HbH is allowed only once */
 405         if (np->rxopt.bits.hopopts && opt->hop) {
 406                 u8 *ptr = skb->nh.raw + opt->hop;
 407                 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
 408         }
 409
 410         if (opt->lastopt &&
 411             (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
 412                 /*
 413                  * Silly enough, but we need to reparse in order to
 414                  * report extension headers (except for HbH)
 415                  * in order.
 416                  *
 417                  * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
 418                  * (and WILL NOT be) defined because
 419                  * IPV6_RECVDSTOPTS is more generic. --yoshfuji
 420                  */
 421                 unsigned int off = sizeof(struct ipv6hdr);
 422                 u8 nexthdr = skb->nh.ipv6h->nexthdr;
 423
 424                 while (off <= opt->lastopt) {
 425                         unsigned len;
 426                         u8 *ptr = skb->nh.raw + off;
 427
 428                         switch(nexthdr) {
 429                         case IPPROTO_DSTOPTS:
 430                                 nexthdr = ptr[0];
 431                                 len = (ptr[1] + 1) << 3;
 432                                 if (np->rxopt.bits.dstopts)
 433                                         put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
 434                                 break;
 435                         case IPPROTO_ROUTING:
 436                                 nexthdr = ptr[0];
 437                                 len = (ptr[1] + 1) << 3;
 438                                 if (np->rxopt.bits.srcrt)
 439                                         put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
 440                                 break;
 441                         case IPPROTO_AH:
 442                                 nexthdr = ptr[0];
 443                                 len = (ptr[1] + 2) << 2;
 444                                 break;
 445                         default:
 446                                 nexthdr = ptr[0];
 447                                 len = (ptr[1] + 1) << 3;
 448                                 break;
 449                         }
 450
 451                         off += len;
 452                 }
 453         }
 454
 455         /* socket options in old style */
 456         if (np->rxopt.bits.rxoinfo) {
 457                 struct in6_pktinfo src_info;
 458
 459                 src_info.ipi6_ifindex = opt->iif;
 460                 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
 461                 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 462         }
 463         if (np->rxopt.bits.rxohlim) {
 464                 int hlim = skb->nh.ipv6h->hop_limit;
 465                 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 466         }
 467         if (np->rxopt.bits.ohopopts && opt->hop) {
 468                 u8 *ptr = skb->nh.raw + opt->hop;
 469                 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
 470         }
 471         if (np->rxopt.bits.odstopts && opt->dst0) {
 472                 u8 *ptr = skb->nh.raw + opt->dst0;
 473                 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
 474         }
 475         if (np->rxopt.bits.osrcrt && opt->srcrt) {
 476                 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt);
 477                 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
 478         }
 479         if (np->rxopt.bits.odstopts && opt->dst1) {
 480                 u8 *ptr = skb->nh.raw + opt->dst1;
 481                 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
 482         }
 483         return 0;
 484 }
 485
 486 int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
 487                       struct ipv6_txoptions *opt,
 488                       int *hlimit, int *tclass)
 489 {
 490         struct in6_pktinfo *src_info;
 491         struct cmsghdr *cmsg;
 492         struct ipv6_rt_hdr *rthdr;
 493         struct ipv6_opt_hdr *hdr;
 494         int len;
 495         int err = 0;
 496
 497         for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
 498                 int addr_type;
 499                 struct net_device *dev = NULL;
 500
 501                 if (!CMSG_OK(msg, cmsg)) {
 502                         err = -EINVAL;
 503                         goto exit_f;
 504                 }
 505
 506                 if (cmsg->cmsg_level != SOL_IPV6)
 507                         continue;
 508
 509                 switch (cmsg->cmsg_type) {
 510                 case IPV6_PKTINFO:
 511                 case IPV6_2292PKTINFO:
 512                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
 513                                 err = -EINVAL;
 514                                 goto exit_f;
 515                         }
 516
 517                         src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
 518
 519                         if (src_info->ipi6_ifindex) {
 520                                 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
 521                                         return -EINVAL;
 522                                 fl->oif = src_info->ipi6_ifindex;
 523                         }
 524
 525                         addr_type = ipv6_addr_type(&src_info->ipi6_addr);
 526
 527                         if (addr_type == IPV6_ADDR_ANY)
 528                                 break;
 529
 530                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 531                                 if (!src_info->ipi6_ifindex)
 532                                         return -EINVAL;
 533                                 else {
 534                                         dev = dev_get_by_index(src_info->ipi6_ifindex);
 535                                         if (!dev)
 536                                                 return -ENODEV;
 537                                 }
 538                         }
 539                         if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) {
 540                                 if (dev)
 541                                         dev_put(dev);
 542                                 err = -EINVAL;
 543                                 goto exit_f;
 544                         }
 545                         if (dev)
 546                                 dev_put(dev);
 547
 548                         ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
 549                         break;
 550
 551                 case IPV6_FLOWINFO:
 552                         if (cmsg->cmsg_len < CMSG_LEN(4)) {
 553                                 err = -EINVAL;
 554                                 goto exit_f;
 555                         }
 556
 557                         if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
 558                                 if ((fl->fl6_flowlabel^*(u32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
 559                                         err = -EINVAL;
 560                                         goto exit_f;
 561                                 }
 562                         }
 563                         fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(u32 *)CMSG_DATA(cmsg);
 564                         break;
 565
 566                 case IPV6_2292HOPOPTS:
 567                 case IPV6_HOPOPTS:
 568                         if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
 569                                 err = -EINVAL;
 570                                 goto exit_f;
 571                         }
 572
 573                         hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
 574                         len = ((hdr->hdrlen + 1) << 3);
 575                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
 576                                 err = -EINVAL;
 577                                 goto exit_f;
 578                         }
 579                         if (!capable(CAP_NET_RAW)) {
 580                                 err = -EPERM;
 581                                 goto exit_f;
 582                         }
 583                         opt->opt_nflen += len;
 584                         opt->hopopt = hdr;
 585                         break;
 586
 587                 case IPV6_2292DSTOPTS:
 588                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
 589                                 err = -EINVAL;
 590                                 goto exit_f;
 591                         }
 592
 593                         hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
 594                         len = ((hdr->hdrlen + 1) << 3);
 595                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
 596                                 err = -EINVAL;
 597                                 goto exit_f;
 598                         }
 599                         if (!capable(CAP_NET_RAW)) {
 600                                 err = -EPERM;
 601                                 goto exit_f;
 602                         }
 603                         if (opt->dst1opt) {
 604                                 err = -EINVAL;
 605                                 goto exit_f;
 606                         }
 607                         opt->opt_flen += len;
 608                         opt->dst1opt = hdr;
 609                         break;
 610
 611                 case IPV6_DSTOPTS:
 612                 case IPV6_RTHDRDSTOPTS:
 613                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
 614                                 err = -EINVAL;
 615                                 goto exit_f;
 616                         }
 617
 618                         hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
 619                         len = ((hdr->hdrlen + 1) << 3);
 620                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
 621                                 err = -EINVAL;
 622                                 goto exit_f;
 623                         }
 624                         if (!capable(CAP_NET_RAW)) {
 625                                 err = -EPERM;
 626                                 goto exit_f;
 627                         }
 628                         if (cmsg->cmsg_type == IPV6_DSTOPTS) {
 629                                 opt->opt_flen += len;
 630                                 opt->dst1opt = hdr;
 631                         } else {
 632                                 opt->opt_nflen += len;
 633                                 opt->dst0opt = hdr;
 634                         }
 635                         break;
 636
 637                 case IPV6_2292RTHDR:
 638                 case IPV6_RTHDR:
 639                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
 640                                 err = -EINVAL;
 641                                 goto exit_f;
 642                         }
 643
 644                         rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
 645
 646                         /*
 647                          *      TYPE 0
 648                          */
 649                         if (rthdr->type) {
 650                                 err = -EINVAL;
 651                                 goto exit_f;
 652                         }
 653
 654                         len = ((rthdr->hdrlen + 1) << 3);
 655
 656                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
 657                                 err = -EINVAL;
 658                                 goto exit_f;
 659                         }
 660
 661                         /* segments left must also match */
 662                         if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
 663                                 err = -EINVAL;
 664                                 goto exit_f;
 665                         }
 666
 667                         opt->opt_nflen += len;
 668                         opt->srcrt = rthdr;
 669
 670                         if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
 671                                 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
 672
 673                                 opt->opt_nflen += dsthdrlen;
 674                                 opt->dst0opt = opt->dst1opt;
 675                                 opt->dst1opt = NULL;
 676                                 opt->opt_flen -= dsthdrlen;
 677                         }
 678
 679                         break;
 680
 681                 case IPV6_2292HOPLIMIT:
 682                 case IPV6_HOPLIMIT:
 683                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
 684                                 err = -EINVAL;
 685                                 goto exit_f;
 686                         }
 687
 688                         *hlimit = *(int *)CMSG_DATA(cmsg);
 689                         break;
 690
 691                 case IPV6_TCLASS:
 692                     {
 693                         int tc;
 694
 695                         err = -EINVAL;
 696                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
 697                                 goto exit_f;
 698                         }
 699
 700                         tc = *(int *)CMSG_DATA(cmsg);
 701                         if (tc < -1 || tc > 0xff)
 702                                 goto exit_f;
 703
 704                         err = 0;
 705                         *tclass = tc;
 706
 707                         break;
 708                     }
 709                 default:
 710                         LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
 711                                        cmsg->cmsg_type);
 712                         err = -EINVAL;
 713                         break;
 714                 };
 715         }
 716
 717 exit_f:
 718         return err;
 719 }