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/interrupt.h>
  21 #include <linux/socket.h>
  22 #include <linux/sockios.h>
  23 #include <linux/in6.h>
  24 #include <linux/ipv6.h>
  25 #include <linux/route.h>
  26
  27 #include <net/ipv6.h>
  28 #include <net/ndisc.h>
  29 #include <net/addrconf.h>
  30 #include <net/transp_v6.h>
  31 #include <net/ip6_route.h>
  32 #include <net/tcp_states.h>
  33
  34 #include <linux/errqueue.h>
  35 #include <asm/uaccess.h>
  36
  37 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
  38 {
  39         struct sockaddr_in6     *usin = (struct sockaddr_in6 *) uaddr;
  40         struct inet_sock        *inet = inet_sk(sk);
  41         struct ipv6_pinfo       *np = inet6_sk(sk);
  42         struct in6_addr         *daddr, *final_p = NULL, final;
  43         struct dst_entry        *dst;
  44         struct flowi            fl;
  45         struct ip6_flowlabel    *flowlabel = NULL;
  46         int                     addr_type;
  47         int                     err;
  48
  49         if (usin->sin6_family == AF_INET) {
  50                 if (__ipv6_only_sock(sk))
  51                         return -EAFNOSUPPORT;
  52                 err = ip4_datagram_connect(sk, uaddr, addr_len);
  53                 goto ipv4_connected;
  54         }
  55
  56         if (addr_len < SIN6_LEN_RFC2133)
  57                 return -EINVAL;
  58
  59         if (usin->sin6_family != AF_INET6)
  60                 return -EAFNOSUPPORT;
  61
  62         memset(&fl, 0, sizeof(fl));
  63         if (np->sndflow) {
  64                 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
  65                 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
  66                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
  67                         if (flowlabel == NULL)
  68                                 return -EINVAL;
  69                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
  70                 }
  71         }
  72
  73         addr_type = ipv6_addr_type(&usin->sin6_addr);
  74
  75         if (addr_type == IPV6_ADDR_ANY) {
  76                 /*
  77                  *      connect to self
  78                  */
  79                 usin->sin6_addr.s6_addr[15] = 0x01;
  80         }
  81
  82         daddr = &usin->sin6_addr;
  83
  84         if (addr_type == IPV6_ADDR_MAPPED) {
  85                 struct sockaddr_in sin;
  86
  87                 if (__ipv6_only_sock(sk)) {
  88                         err = -ENETUNREACH;
  89                         goto out;
  90                 }
  91                 sin.sin_family = AF_INET;
  92                 sin.sin_addr.s_addr = daddr->s6_addr32[3];
  93                 sin.sin_port = usin->sin6_port;
  94
  95                 err = ip4_datagram_connect(sk,
  96                                            (struct sockaddr*) &sin,
  97                                            sizeof(sin));
  98
  99 ipv4_connected:
 100                 if (err)
 101                         goto out;
 102
 103                 ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr);
 104
 105                 if (ipv6_addr_any(&np->saddr)) {
 106                         ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff),
 107                                       inet->saddr);
 108                 }
 109
 110                 if (ipv6_addr_any(&np->rcv_saddr)) {
 111                         ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff),
 112                                       inet->rcv_saddr);
 113                 }
 114                 goto out;
 115         }
 116
 117         if (addr_type&IPV6_ADDR_LINKLOCAL) {
 118                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 119                     usin->sin6_scope_id) {
 120                         if (sk->sk_bound_dev_if &&
 121                             sk->sk_bound_dev_if != usin->sin6_scope_id) {
 122                                 err = -EINVAL;
 123                                 goto out;
 124                         }
 125                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 126                         if (!sk->sk_bound_dev_if &&
 127                             (addr_type & IPV6_ADDR_MULTICAST))
 128                                 fl.oif = np->mcast_oif;
 129                 }
 130
 131                 /* Connect to link-local address requires an interface */
 132                 if (!sk->sk_bound_dev_if) {
 133                         err = -EINVAL;
 134                         goto out;
 135                 }
 136         }
 137
 138         ipv6_addr_copy(&np->daddr, daddr);
 139         np->flow_label = fl.fl6_flowlabel;
 140
 141         inet->dport = usin->sin6_port;
 142
 143         /*
 144          *      Check for a route to destination an obtain the
 145          *      destination cache for it.
 146          */
 147
 148         fl.proto = sk->sk_protocol;
 149         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 150         ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 151         fl.oif = sk->sk_bound_dev_if;
 152         fl.fl_ip_dport = inet->dport;
 153         fl.fl_ip_sport = inet->sport;
 154
 155         if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
 156                 fl.oif = np->mcast_oif;
 157
 158         security_sk_classify_flow(sk, &fl);
 159
 160         if (flowlabel) {
 161                 if (flowlabel->opt && flowlabel->opt->srcrt) {
 162                         struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt;
 163                         ipv6_addr_copy(&final, &fl.fl6_dst);
 164                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 165                         final_p = &final;
 166                 }
 167         } else if (np->opt && np->opt->srcrt) {
 168                 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
 169                 ipv6_addr_copy(&final, &fl.fl6_dst);
 170                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 171                 final_p = &final;
 172         }
 173
 174         err = ip6_dst_lookup(sk, &dst, &fl);
 175         if (err)
 176                 goto out;
 177         if (final_p)
 178                 ipv6_addr_copy(&fl.fl6_dst, final_p);
 179
 180         if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0)
 181                 goto out;
 182
 183         /* source address lookup done in ip6_dst_lookup */
 184
 185         if (ipv6_addr_any(&np->saddr))
 186                 ipv6_addr_copy(&np->saddr, &fl.fl6_src);
 187
 188         if (ipv6_addr_any(&np->rcv_saddr)) {
 189                 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
 190                 inet->rcv_saddr = LOOPBACK4_IPV6;
 191         }
 192
 193         ip6_dst_store(sk, dst,
 194                       ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
 195                       &np->daddr : NULL,
 196 #ifdef CONFIG_IPV6_SUBTREES
 197                       ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
 198                       &np->saddr :
 199 #endif
 200                       NULL);
 201
 202         sk->sk_state = TCP_ESTABLISHED;
 203 out:
 204         fl6_sock_release(flowlabel);
 205         return err;
 206 }
 207
 208 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
 209                      __be16 port, u32 info, u8 *payload)
 210 {
 211         struct ipv6_pinfo *np  = inet6_sk(sk);
 212         struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw;
 213         struct sock_exterr_skb *serr;
 214
 215         if (!np->recverr)
 216                 return;
 217
 218         skb = skb_clone(skb, GFP_ATOMIC);
 219         if (!skb)
 220                 return;
 221
 222         serr = SKB_EXT_ERR(skb);
 223         serr->ee.ee_errno = err;
 224         serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
 225         serr->ee.ee_type = icmph->icmp6_type;
 226         serr->ee.ee_code = icmph->icmp6_code;
 227         serr->ee.ee_pad = 0;
 228         serr->ee.ee_info = info;
 229         serr->ee.ee_data = 0;
 230         serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw;
 231         serr->port = port;
 232
 233         skb->h.raw = payload;
 234         __skb_pull(skb, payload - skb->data);
 235
 236         if (sock_queue_err_skb(sk, skb))
 237                 kfree_skb(skb);
 238 }
 239
 240 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
 241 {
 242         struct ipv6_pinfo *np = inet6_sk(sk);
 243         struct sock_exterr_skb *serr;
 244         struct ipv6hdr *iph;
 245         struct sk_buff *skb;
 246
 247         if (!np->recverr)
 248                 return;
 249
 250         skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
 251         if (!skb)
 252                 return;
 253
 254         iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr));
 255         skb->nh.ipv6h = iph;
 256         ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
 257
 258         serr = SKB_EXT_ERR(skb);
 259         serr->ee.ee_errno = err;
 260         serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
 261         serr->ee.ee_type = 0;
 262         serr->ee.ee_code = 0;
 263         serr->ee.ee_pad = 0;
 264         serr->ee.ee_info = info;
 265         serr->ee.ee_data = 0;
 266         serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
 267         serr->port = fl->fl_ip_dport;
 268
 269         skb->h.raw = skb->tail;
 270         __skb_pull(skb, skb->tail - skb->data);
 271
 272         if (sock_queue_err_skb(sk, skb))
 273                 kfree_skb(skb);
 274 }
 275
 276 /*
 277  *      Handle MSG_ERRQUEUE
 278  */
 279 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
 280 {
 281         struct ipv6_pinfo *np = inet6_sk(sk);
 282         struct sock_exterr_skb *serr;
 283         struct sk_buff *skb, *skb2;
 284         struct sockaddr_in6 *sin;
 285         struct {
 286                 struct sock_extended_err ee;
 287                 struct sockaddr_in6      offender;
 288         } errhdr;
 289         int err;
 290         int copied;
 291
 292         err = -EAGAIN;
 293         skb = skb_dequeue(&sk->sk_error_queue);
 294         if (skb == NULL)
 295                 goto out;
 296
 297         copied = skb->len;
 298         if (copied > len) {
 299                 msg->msg_flags |= MSG_TRUNC;
 300                 copied = len;
 301         }
 302         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 303         if (err)
 304                 goto out_free_skb;
 305
 306         sock_recv_timestamp(msg, sk, skb);
 307
 308         serr = SKB_EXT_ERR(skb);
 309
 310         sin = (struct sockaddr_in6 *)msg->msg_name;
 311         if (sin) {
 312                 sin->sin6_family = AF_INET6;
 313                 sin->sin6_flowinfo = 0;
 314                 sin->sin6_port = serr->port;
 315                 sin->sin6_scope_id = 0;
 316                 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
 317                         ipv6_addr_copy(&sin->sin6_addr,
 318                           (struct in6_addr *)(skb->nh.raw + serr->addr_offset));
 319                         if (np->sndflow)
 320                                 sin->sin6_flowinfo = *(__be32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK;
 321                         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 322                                 sin->sin6_scope_id = IP6CB(skb)->iif;
 323                 } else {
 324                         ipv6_addr_set(&sin->sin6_addr, 0, 0,
 325                                       htonl(0xffff),
 326                                       *(__be32*)(skb->nh.raw + serr->addr_offset));
 327                 }
 328         }
 329
 330         memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
 331         sin = &errhdr.offender;
 332         sin->sin6_family = AF_UNSPEC;
 333         if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
 334                 sin->sin6_family = AF_INET6;
 335                 sin->sin6_flowinfo = 0;
 336                 sin->sin6_scope_id = 0;
 337                 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
 338                         ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr);
 339                         if (np->rxopt.all)
 340                                 datagram_recv_ctl(sk, msg, skb);
 341                         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 342                                 sin->sin6_scope_id = IP6CB(skb)->iif;
 343                 } else {
 344                         struct inet_sock *inet = inet_sk(sk);
 345
 346                         ipv6_addr_set(&sin->sin6_addr, 0, 0,
 347                                       htonl(0xffff),
 348                                       skb->nh.iph->saddr);
 349                         if (inet->cmsg_flags)
 350                                 ip_cmsg_recv(msg, skb);
 351                 }
 352         }
 353
 354         put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
 355
 356         /* Now we could try to dump offended packet options */
 357
 358         msg->msg_flags |= MSG_ERRQUEUE;
 359         err = copied;
 360
 361         /* Reset and regenerate socket error */
 362         spin_lock_bh(&sk->sk_error_queue.lock);
 363         sk->sk_err = 0;
 364         if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
 365                 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
 366                 spin_unlock_bh(&sk->sk_error_queue.lock);
 367                 sk->sk_error_report(sk);
 368         } else {
 369                 spin_unlock_bh(&sk->sk_error_queue.lock);
 370         }
 371
 372 out_free_skb:
 373         kfree_skb(skb);
 374 out:
 375         return err;
 376 }
 377
 378
 379
 380 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
 381 {
 382         struct ipv6_pinfo *np = inet6_sk(sk);
 383         struct inet6_skb_parm *opt = IP6CB(skb);
 384
 385         if (np->rxopt.bits.rxinfo) {
 386                 struct in6_pktinfo src_info;
 387
 388                 src_info.ipi6_ifindex = opt->iif;
 389                 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
 390                 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 391         }
 392
 393         if (np->rxopt.bits.rxhlim) {
 394                 int hlim = skb->nh.ipv6h->hop_limit;
 395                 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 396         }
 397
 398         if (np->rxopt.bits.rxtclass) {
 399                 int tclass = (ntohl(*(__be32 *)skb->nh.ipv6h) >> 20) & 0xff;
 400                 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
 401         }
 402
 403         if (np->rxopt.bits.rxflow && (*(__be32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) {
 404                 __be32 flowinfo = *(__be32*)skb->nh.raw & IPV6_FLOWINFO_MASK;
 405                 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
 406         }
 407
 408         /* HbH is allowed only once */
 409         if (np->rxopt.bits.hopopts && opt->hop) {
 410                 u8 *ptr = skb->nh.raw + opt->hop;
 411                 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
 412         }
 413
 414         if (opt->lastopt &&
 415             (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
 416                 /*
 417                  * Silly enough, but we need to reparse in order to
 418                  * report extension headers (except for HbH)
 419                  * in order.
 420                  *
 421                  * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
 422                  * (and WILL NOT be) defined because
 423                  * IPV6_RECVDSTOPTS is more generic. --yoshfuji
 424                  */
 425                 unsigned int off = sizeof(struct ipv6hdr);
 426                 u8 nexthdr = skb->nh.ipv6h->nexthdr;
 427
 428                 while (off <= opt->lastopt) {
 429                         unsigned len;
 430                         u8 *ptr = skb->nh.raw + off;
 431
 432                         switch(nexthdr) {
 433                         case IPPROTO_DSTOPTS:
 434                                 nexthdr = ptr[0];
 435                                 len = (ptr[1] + 1) << 3;
 436                                 if (np->rxopt.bits.dstopts)
 437                                         put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
 438                                 break;
 439                         case IPPROTO_ROUTING:
 440                                 nexthdr = ptr[0];
 441                                 len = (ptr[1] + 1) << 3;
 442                                 if (np->rxopt.bits.srcrt)
 443                                         put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
 444                                 break;
 445                         case IPPROTO_AH:
 446                                 nexthdr = ptr[0];
 447                                 len = (ptr[1] + 2) << 2;
 448                                 break;
 449                         default:
 450                                 nexthdr = ptr[0];
 451                                 len = (ptr[1] + 1) << 3;
 452                                 break;
 453                         }
 454
 455                         off += len;
 456                 }
 457         }
 458
 459         /* socket options in old style */
 460         if (np->rxopt.bits.rxoinfo) {
 461                 struct in6_pktinfo src_info;
 462
 463                 src_info.ipi6_ifindex = opt->iif;
 464                 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
 465                 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 466         }
 467         if (np->rxopt.bits.rxohlim) {
 468                 int hlim = skb->nh.ipv6h->hop_limit;
 469                 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 470         }
 471         if (np->rxopt.bits.ohopopts && opt->hop) {
 472                 u8 *ptr = skb->nh.raw + opt->hop;
 473                 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
 474         }
 475         if (np->rxopt.bits.odstopts && opt->dst0) {
 476                 u8 *ptr = skb->nh.raw + opt->dst0;
 477                 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
 478         }
 479         if (np->rxopt.bits.osrcrt && opt->srcrt) {
 480                 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt);
 481                 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
 482         }
 483         if (np->rxopt.bits.odstopts && opt->dst1) {
 484                 u8 *ptr = skb->nh.raw + opt->dst1;
 485                 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
 486         }
 487         return 0;
 488 }
 489
 490 int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
 491                       struct ipv6_txoptions *opt,
 492                       int *hlimit, int *tclass)
 493 {
 494         struct in6_pktinfo *src_info;
 495         struct cmsghdr *cmsg;
 496         struct ipv6_rt_hdr *rthdr;
 497         struct ipv6_opt_hdr *hdr;
 498         int len;
 499         int err = 0;
 500
 501         for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
 502                 int addr_type;
 503                 struct net_device *dev = NULL;
 504
 505                 if (!CMSG_OK(msg, cmsg)) {
 506                         err = -EINVAL;
 507                         goto exit_f;
 508                 }
 509
 510                 if (cmsg->cmsg_level != SOL_IPV6)
 511                         continue;
 512
 513                 switch (cmsg->cmsg_type) {
 514                 case IPV6_PKTINFO:
 515                 case IPV6_2292PKTINFO:
 516                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
 517                                 err = -EINVAL;
 518                                 goto exit_f;
 519                         }
 520
 521                         src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
 522
 523                         if (src_info->ipi6_ifindex) {
 524                                 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
 525                                         return -EINVAL;
 526                                 fl->oif = src_info->ipi6_ifindex;
 527                         }
 528
 529                         addr_type = ipv6_addr_type(&src_info->ipi6_addr);
 530
 531                         if (addr_type == IPV6_ADDR_ANY)
 532                                 break;
 533
 534                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 535                                 if (!src_info->ipi6_ifindex)
 536                                         return -EINVAL;
 537                                 else {
 538                                         dev = dev_get_by_index(src_info->ipi6_ifindex);
 539                                         if (!dev)
 540                                                 return -ENODEV;
 541                                 }
 542                         }
 543                         if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) {
 544                                 if (dev)
 545                                         dev_put(dev);
 546                                 err = -EINVAL;
 547                                 goto exit_f;
 548                         }
 549                         if (dev)
 550                                 dev_put(dev);
 551
 552                         ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
 553                         break;
 554
 555                 case IPV6_FLOWINFO:
 556                         if (cmsg->cmsg_len < CMSG_LEN(4)) {
 557                                 err = -EINVAL;
 558                                 goto exit_f;
 559                         }
 560
 561                         if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
 562                                 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
 563                                         err = -EINVAL;
 564                                         goto exit_f;
 565                                 }
 566                         }
 567                         fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
 568                         break;
 569
 570                 case IPV6_2292HOPOPTS:
 571                 case IPV6_HOPOPTS:
 572                         if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
 573                                 err = -EINVAL;
 574                                 goto exit_f;
 575                         }
 576
 577                         hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
 578                         len = ((hdr->hdrlen + 1) << 3);
 579                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
 580                                 err = -EINVAL;
 581                                 goto exit_f;
 582                         }
 583                         if (!capable(CAP_NET_RAW)) {
 584                                 err = -EPERM;
 585                                 goto exit_f;
 586                         }
 587                         opt->opt_nflen += len;
 588                         opt->hopopt = hdr;
 589                         break;
 590
 591                 case IPV6_2292DSTOPTS:
 592                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
 593                                 err = -EINVAL;
 594                                 goto exit_f;
 595                         }
 596
 597                         hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
 598                         len = ((hdr->hdrlen + 1) << 3);
 599                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
 600                                 err = -EINVAL;
 601                                 goto exit_f;
 602                         }
 603                         if (!capable(CAP_NET_RAW)) {
 604                                 err = -EPERM;
 605                                 goto exit_f;
 606                         }
 607                         if (opt->dst1opt) {
 608                                 err = -EINVAL;
 609                                 goto exit_f;
 610                         }
 611                         opt->opt_flen += len;
 612                         opt->dst1opt = hdr;
 613                         break;
 614
 615                 case IPV6_DSTOPTS:
 616                 case IPV6_RTHDRDSTOPTS:
 617                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
 618                                 err = -EINVAL;
 619                                 goto exit_f;
 620                         }
 621
 622                         hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
 623                         len = ((hdr->hdrlen + 1) << 3);
 624                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
 625                                 err = -EINVAL;
 626                                 goto exit_f;
 627                         }
 628                         if (!capable(CAP_NET_RAW)) {
 629                                 err = -EPERM;
 630                                 goto exit_f;
 631                         }
 632                         if (cmsg->cmsg_type == IPV6_DSTOPTS) {
 633                                 opt->opt_flen += len;
 634                                 opt->dst1opt = hdr;
 635                         } else {
 636                                 opt->opt_nflen += len;
 637                                 opt->dst0opt = hdr;
 638                         }
 639                         break;
 640
 641                 case IPV6_2292RTHDR:
 642                 case IPV6_RTHDR:
 643                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
 644                                 err = -EINVAL;
 645                                 goto exit_f;
 646                         }
 647
 648                         rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
 649
 650                         switch (rthdr->type) {
 651                         case IPV6_SRCRT_TYPE_0:
 652 #ifdef CONFIG_IPV6_MIP6
 653                         case IPV6_SRCRT_TYPE_2:
 654 #endif
 655                                 break;
 656                         default:
 657                                 err = -EINVAL;
 658                                 goto exit_f;
 659                         }
 660
 661                         len = ((rthdr->hdrlen + 1) << 3);
 662
 663                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
 664                                 err = -EINVAL;
 665                                 goto exit_f;
 666                         }
 667
 668                         /* segments left must also match */
 669                         if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
 670                                 err = -EINVAL;
 671                                 goto exit_f;
 672                         }
 673
 674                         opt->opt_nflen += len;
 675                         opt->srcrt = rthdr;
 676
 677                         if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
 678                                 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
 679
 680                                 opt->opt_nflen += dsthdrlen;
 681                                 opt->dst0opt = opt->dst1opt;
 682                                 opt->dst1opt = NULL;
 683                                 opt->opt_flen -= dsthdrlen;
 684                         }
 685
 686                         break;
 687
 688                 case IPV6_2292HOPLIMIT:
 689                 case IPV6_HOPLIMIT:
 690                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
 691                                 err = -EINVAL;
 692                                 goto exit_f;
 693                         }
 694
 695                         *hlimit = *(int *)CMSG_DATA(cmsg);
 696                         break;
 697
 698                 case IPV6_TCLASS:
 699                     {
 700                         int tc;
 701
 702                         err = -EINVAL;
 703                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
 704                                 goto exit_f;
 705                         }
 706
 707                         tc = *(int *)CMSG_DATA(cmsg);
 708                         if (tc < -1 || tc > 0xff)
 709                                 goto exit_f;
 710
 711                         err = 0;
 712                         *tclass = tc;
 713
 714                         break;
 715                     }
 716                 default:
 717                         LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
 718                                        cmsg->cmsg_type);
 719                         err = -EINVAL;
 720                         break;
 721                 };
 722         }
 723
 724 exit_f:
 725         return err;
 726 }