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 #ifdef CONFIG_IPV6_SUBTREES
 198                       ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
 199                       &np->saddr :
 200 #endif
 201                       NULL);
 202
 203         sk->sk_state = TCP_ESTABLISHED;
 204 out:
 205         fl6_sock_release(flowlabel);
 206         return err;
 207 }
 208
 209 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
 210                      __be16 port, u32 info, u8 *payload)
 211 {
 212         struct ipv6_pinfo *np  = inet6_sk(sk);
 213         struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw;
 214         struct sock_exterr_skb *serr;
 215
 216         if (!np->recverr)
 217                 return;
 218
 219         skb = skb_clone(skb, GFP_ATOMIC);
 220         if (!skb)
 221                 return;
 222
 223         serr = SKB_EXT_ERR(skb);
 224         serr->ee.ee_errno = err;
 225         serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
 226         serr->ee.ee_type = icmph->icmp6_type;
 227         serr->ee.ee_code = icmph->icmp6_code;
 228         serr->ee.ee_pad = 0;
 229         serr->ee.ee_info = info;
 230         serr->ee.ee_data = 0;
 231         serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw;
 232         serr->port = port;
 233
 234         skb->h.raw = payload;
 235         __skb_pull(skb, payload - skb->data);
 236
 237         if (sock_queue_err_skb(sk, skb))
 238                 kfree_skb(skb);
 239 }
 240
 241 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
 242 {
 243         struct ipv6_pinfo *np = inet6_sk(sk);
 244         struct sock_exterr_skb *serr;
 245         struct ipv6hdr *iph;
 246         struct sk_buff *skb;
 247
 248         if (!np->recverr)
 249                 return;
 250
 251         skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
 252         if (!skb)
 253                 return;
 254
 255         iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr));
 256         skb->nh.ipv6h = iph;
 257         ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
 258
 259         serr = SKB_EXT_ERR(skb);
 260         serr->ee.ee_errno = err;
 261         serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
 262         serr->ee.ee_type = 0;
 263         serr->ee.ee_code = 0;
 264         serr->ee.ee_pad = 0;
 265         serr->ee.ee_info = info;
 266         serr->ee.ee_data = 0;
 267         serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
 268         serr->port = fl->fl_ip_dport;
 269
 270         skb->h.raw = skb->tail;
 271         __skb_pull(skb, skb->tail - skb->data);
 272
 273         if (sock_queue_err_skb(sk, skb))
 274                 kfree_skb(skb);
 275 }
 276
 277 /*
 278  *      Handle MSG_ERRQUEUE
 279  */
 280 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
 281 {
 282         struct ipv6_pinfo *np = inet6_sk(sk);
 283         struct sock_exterr_skb *serr;
 284         struct sk_buff *skb, *skb2;
 285         struct sockaddr_in6 *sin;
 286         struct {
 287                 struct sock_extended_err ee;
 288                 struct sockaddr_in6      offender;
 289         } errhdr;
 290         int err;
 291         int copied;
 292
 293         err = -EAGAIN;
 294         skb = skb_dequeue(&sk->sk_error_queue);
 295         if (skb == NULL)
 296                 goto out;
 297
 298         copied = skb->len;
 299         if (copied > len) {
 300                 msg->msg_flags |= MSG_TRUNC;
 301                 copied = len;
 302         }
 303         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 304         if (err)
 305                 goto out_free_skb;
 306
 307         sock_recv_timestamp(msg, sk, skb);
 308
 309         serr = SKB_EXT_ERR(skb);
 310
 311         sin = (struct sockaddr_in6 *)msg->msg_name;
 312         if (sin) {
 313                 sin->sin6_family = AF_INET6;
 314                 sin->sin6_flowinfo = 0;
 315                 sin->sin6_port = serr->port;
 316                 sin->sin6_scope_id = 0;
 317                 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
 318                         ipv6_addr_copy(&sin->sin6_addr,
 319                           (struct in6_addr *)(skb->nh.raw + serr->addr_offset));
 320                         if (np->sndflow)
 321                                 sin->sin6_flowinfo = *(__be32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK;
 322                         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 323                                 sin->sin6_scope_id = IP6CB(skb)->iif;
 324                 } else {
 325                         ipv6_addr_set(&sin->sin6_addr, 0, 0,
 326                                       htonl(0xffff),
 327                                       *(__be32*)(skb->nh.raw + serr->addr_offset));
 328                 }
 329         }
 330
 331         memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
 332         sin = &errhdr.offender;
 333         sin->sin6_family = AF_UNSPEC;
 334         if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
 335                 sin->sin6_family = AF_INET6;
 336                 sin->sin6_flowinfo = 0;
 337                 sin->sin6_scope_id = 0;
 338                 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
 339                         ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr);
 340                         if (np->rxopt.all)
 341                                 datagram_recv_ctl(sk, msg, skb);
 342                         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 343                                 sin->sin6_scope_id = IP6CB(skb)->iif;
 344                 } else {
 345                         struct inet_sock *inet = inet_sk(sk);
 346
 347                         ipv6_addr_set(&sin->sin6_addr, 0, 0,
 348                                       htonl(0xffff),
 349                                       skb->nh.iph->saddr);
 350                         if (inet->cmsg_flags)
 351                                 ip_cmsg_recv(msg, skb);
 352                 }
 353         }
 354
 355         put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
 356
 357         /* Now we could try to dump offended packet options */
 358
 359         msg->msg_flags |= MSG_ERRQUEUE;
 360         err = copied;
 361
 362         /* Reset and regenerate socket error */
 363         spin_lock_bh(&sk->sk_error_queue.lock);
 364         sk->sk_err = 0;
 365         if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
 366                 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
 367                 spin_unlock_bh(&sk->sk_error_queue.lock);
 368                 sk->sk_error_report(sk);
 369         } else {
 370                 spin_unlock_bh(&sk->sk_error_queue.lock);
 371         }
 372
 373 out_free_skb:
 374         kfree_skb(skb);
 375 out:
 376         return err;
 377 }
 378
 379
 380
 381 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
 382 {
 383         struct ipv6_pinfo *np = inet6_sk(sk);
 384         struct inet6_skb_parm *opt = IP6CB(skb);
 385
 386         if (np->rxopt.bits.rxinfo) {
 387                 struct in6_pktinfo src_info;
 388
 389                 src_info.ipi6_ifindex = opt->iif;
 390                 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
 391                 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 392         }
 393
 394         if (np->rxopt.bits.rxhlim) {
 395                 int hlim = skb->nh.ipv6h->hop_limit;
 396                 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 397         }
 398
 399         if (np->rxopt.bits.rxtclass) {
 400                 int tclass = (ntohl(*(__be32 *)skb->nh.ipv6h) >> 20) & 0xff;
 401                 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
 402         }
 403
 404         if (np->rxopt.bits.rxflow && (*(__be32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) {
 405                 __be32 flowinfo = *(__be32*)skb->nh.raw & IPV6_FLOWINFO_MASK;
 406                 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
 407         }
 408
 409         /* HbH is allowed only once */
 410         if (np->rxopt.bits.hopopts && opt->hop) {
 411                 u8 *ptr = skb->nh.raw + opt->hop;
 412                 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
 413         }
 414
 415         if (opt->lastopt &&
 416             (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
 417                 /*
 418                  * Silly enough, but we need to reparse in order to
 419                  * report extension headers (except for HbH)
 420                  * in order.
 421                  *
 422                  * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
 423                  * (and WILL NOT be) defined because
 424                  * IPV6_RECVDSTOPTS is more generic. --yoshfuji
 425                  */
 426                 unsigned int off = sizeof(struct ipv6hdr);
 427                 u8 nexthdr = skb->nh.ipv6h->nexthdr;
 428
 429                 while (off <= opt->lastopt) {
 430                         unsigned len;
 431                         u8 *ptr = skb->nh.raw + off;
 432
 433                         switch(nexthdr) {
 434                         case IPPROTO_DSTOPTS:
 435                                 nexthdr = ptr[0];
 436                                 len = (ptr[1] + 1) << 3;
 437                                 if (np->rxopt.bits.dstopts)
 438                                         put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
 439                                 break;
 440                         case IPPROTO_ROUTING:
 441                                 nexthdr = ptr[0];
 442                                 len = (ptr[1] + 1) << 3;
 443                                 if (np->rxopt.bits.srcrt)
 444                                         put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
 445                                 break;
 446                         case IPPROTO_AH:
 447                                 nexthdr = ptr[0];
 448                                 len = (ptr[1] + 2) << 2;
 449                                 break;
 450                         default:
 451                                 nexthdr = ptr[0];
 452                                 len = (ptr[1] + 1) << 3;
 453                                 break;
 454                         }
 455
 456                         off += len;
 457                 }
 458         }
 459
 460         /* socket options in old style */
 461         if (np->rxopt.bits.rxoinfo) {
 462                 struct in6_pktinfo src_info;
 463
 464                 src_info.ipi6_ifindex = opt->iif;
 465                 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
 466                 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 467         }
 468         if (np->rxopt.bits.rxohlim) {
 469                 int hlim = skb->nh.ipv6h->hop_limit;
 470                 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 471         }
 472         if (np->rxopt.bits.ohopopts && opt->hop) {
 473                 u8 *ptr = skb->nh.raw + opt->hop;
 474                 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
 475         }
 476         if (np->rxopt.bits.odstopts && opt->dst0) {
 477                 u8 *ptr = skb->nh.raw + opt->dst0;
 478                 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
 479         }
 480         if (np->rxopt.bits.osrcrt && opt->srcrt) {
 481                 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt);
 482                 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
 483         }
 484         if (np->rxopt.bits.odstopts && opt->dst1) {
 485                 u8 *ptr = skb->nh.raw + opt->dst1;
 486                 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
 487         }
 488         return 0;
 489 }
 490
 491 int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
 492                       struct ipv6_txoptions *opt,
 493                       int *hlimit, int *tclass)
 494 {
 495         struct in6_pktinfo *src_info;
 496         struct cmsghdr *cmsg;
 497         struct ipv6_rt_hdr *rthdr;
 498         struct ipv6_opt_hdr *hdr;
 499         int len;
 500         int err = 0;
 501
 502         for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
 503                 int addr_type;
 504                 struct net_device *dev = NULL;
 505
 506                 if (!CMSG_OK(msg, cmsg)) {
 507                         err = -EINVAL;
 508                         goto exit_f;
 509                 }
 510
 511                 if (cmsg->cmsg_level != SOL_IPV6)
 512                         continue;
 513
 514                 switch (cmsg->cmsg_type) {
 515                 case IPV6_PKTINFO:
 516                 case IPV6_2292PKTINFO:
 517                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
 518                                 err = -EINVAL;
 519                                 goto exit_f;
 520                         }
 521
 522                         src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
 523
 524                         if (src_info->ipi6_ifindex) {
 525                                 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
 526                                         return -EINVAL;
 527                                 fl->oif = src_info->ipi6_ifindex;
 528                         }
 529
 530                         addr_type = ipv6_addr_type(&src_info->ipi6_addr);
 531
 532                         if (addr_type == IPV6_ADDR_ANY)
 533                                 break;
 534
 535                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 536                                 if (!src_info->ipi6_ifindex)
 537                                         return -EINVAL;
 538                                 else {
 539                                         dev = dev_get_by_index(src_info->ipi6_ifindex);
 540                                         if (!dev)
 541                                                 return -ENODEV;
 542                                 }
 543                         }
 544                         if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) {
 545                                 if (dev)
 546                                         dev_put(dev);
 547                                 err = -EINVAL;
 548                                 goto exit_f;
 549                         }
 550                         if (dev)
 551                                 dev_put(dev);
 552
 553                         ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
 554                         break;
 555
 556                 case IPV6_FLOWINFO:
 557                         if (cmsg->cmsg_len < CMSG_LEN(4)) {
 558                                 err = -EINVAL;
 559                                 goto exit_f;
 560                         }
 561
 562                         if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
 563                                 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
 564                                         err = -EINVAL;
 565                                         goto exit_f;
 566                                 }
 567                         }
 568                         fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
 569                         break;
 570
 571                 case IPV6_2292HOPOPTS:
 572                 case IPV6_HOPOPTS:
 573                         if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
 574                                 err = -EINVAL;
 575                                 goto exit_f;
 576                         }
 577
 578                         hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
 579                         len = ((hdr->hdrlen + 1) << 3);
 580                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
 581                                 err = -EINVAL;
 582                                 goto exit_f;
 583                         }
 584                         if (!capable(CAP_NET_RAW)) {
 585                                 err = -EPERM;
 586                                 goto exit_f;
 587                         }
 588                         opt->opt_nflen += len;
 589                         opt->hopopt = hdr;
 590                         break;
 591
 592                 case IPV6_2292DSTOPTS:
 593                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
 594                                 err = -EINVAL;
 595                                 goto exit_f;
 596                         }
 597
 598                         hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
 599                         len = ((hdr->hdrlen + 1) << 3);
 600                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
 601                                 err = -EINVAL;
 602                                 goto exit_f;
 603                         }
 604                         if (!capable(CAP_NET_RAW)) {
 605                                 err = -EPERM;
 606                                 goto exit_f;
 607                         }
 608                         if (opt->dst1opt) {
 609                                 err = -EINVAL;
 610                                 goto exit_f;
 611                         }
 612                         opt->opt_flen += len;
 613                         opt->dst1opt = hdr;
 614                         break;
 615
 616                 case IPV6_DSTOPTS:
 617                 case IPV6_RTHDRDSTOPTS:
 618                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
 619                                 err = -EINVAL;
 620                                 goto exit_f;
 621                         }
 622
 623                         hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
 624                         len = ((hdr->hdrlen + 1) << 3);
 625                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
 626                                 err = -EINVAL;
 627                                 goto exit_f;
 628                         }
 629                         if (!capable(CAP_NET_RAW)) {
 630                                 err = -EPERM;
 631                                 goto exit_f;
 632                         }
 633                         if (cmsg->cmsg_type == IPV6_DSTOPTS) {
 634                                 opt->opt_flen += len;
 635                                 opt->dst1opt = hdr;
 636                         } else {
 637                                 opt->opt_nflen += len;
 638                                 opt->dst0opt = hdr;
 639                         }
 640                         break;
 641
 642                 case IPV6_2292RTHDR:
 643                 case IPV6_RTHDR:
 644                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
 645                                 err = -EINVAL;
 646                                 goto exit_f;
 647                         }
 648
 649                         rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
 650
 651                         switch (rthdr->type) {
 652                         case IPV6_SRCRT_TYPE_0:
 653 #ifdef CONFIG_IPV6_MIP6
 654                         case IPV6_SRCRT_TYPE_2:
 655 #endif
 656                                 break;
 657                         default:
 658                                 err = -EINVAL;
 659                                 goto exit_f;
 660                         }
 661
 662                         len = ((rthdr->hdrlen + 1) << 3);
 663
 664                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
 665                                 err = -EINVAL;
 666                                 goto exit_f;
 667                         }
 668
 669                         /* segments left must also match */
 670                         if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
 671                                 err = -EINVAL;
 672                                 goto exit_f;
 673                         }
 674
 675                         opt->opt_nflen += len;
 676                         opt->srcrt = rthdr;
 677
 678                         if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
 679                                 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
 680
 681                                 opt->opt_nflen += dsthdrlen;
 682                                 opt->dst0opt = opt->dst1opt;
 683                                 opt->dst1opt = NULL;
 684                                 opt->opt_flen -= dsthdrlen;
 685                         }
 686
 687                         break;
 688
 689                 case IPV6_2292HOPLIMIT:
 690                 case IPV6_HOPLIMIT:
 691                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
 692                                 err = -EINVAL;
 693                                 goto exit_f;
 694                         }
 695
 696                         *hlimit = *(int *)CMSG_DATA(cmsg);
 697                         break;
 698
 699                 case IPV6_TCLASS:
 700                     {
 701                         int tc;
 702
 703                         err = -EINVAL;
 704                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
 705                                 goto exit_f;
 706                         }
 707
 708                         tc = *(int *)CMSG_DATA(cmsg);
 709                         if (tc < -1 || tc > 0xff)
 710                                 goto exit_f;
 711
 712                         err = 0;
 713                         *tclass = tc;
 714
 715                         break;
 716                     }
 717                 default:
 718                         LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
 719                                        cmsg->cmsg_type);
 720                         err = -EINVAL;
 721                         break;
 722                 };
 723         }
 724
 725 exit_f:
 726         return err;
 727 }