linux/net/ipv4/ip_options.c
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   1/*
   2 * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3 *              operating system.  INET is implemented using the  BSD Socket
   4 *              interface as the means of communication with the user level.
   5 *
   6 *              The options processing module for ip.c
   7 *
   8 * Authors:     A.N.Kuznetsov
   9 *
  10 */
  11
  12#define pr_fmt(fmt) "IPv4: " fmt
  13
  14#include <linux/capability.h>
  15#include <linux/module.h>
  16#include <linux/slab.h>
  17#include <linux/types.h>
  18#include <asm/uaccess.h>
  19#include <asm/unaligned.h>
  20#include <linux/skbuff.h>
  21#include <linux/ip.h>
  22#include <linux/icmp.h>
  23#include <linux/netdevice.h>
  24#include <linux/rtnetlink.h>
  25#include <net/sock.h>
  26#include <net/ip.h>
  27#include <net/icmp.h>
  28#include <net/route.h>
  29#include <net/cipso_ipv4.h>
  30#include <net/ip_fib.h>
  31
  32/*
  33 * Write options to IP header, record destination address to
  34 * source route option, address of outgoing interface
  35 * (we should already know it, so that this  function is allowed be
  36 * called only after routing decision) and timestamp,
  37 * if we originate this datagram.
  38 *
  39 * daddr is real destination address, next hop is recorded in IP header.
  40 * saddr is address of outgoing interface.
  41 */
  42
  43void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
  44                      __be32 daddr, struct rtable *rt, int is_frag)
  45{
  46        unsigned char *iph = skb_network_header(skb);
  47
  48        memcpy(&(IPCB(skb)->opt), opt, sizeof(struct ip_options));
  49        memcpy(iph+sizeof(struct iphdr), opt->__data, opt->optlen);
  50        opt = &(IPCB(skb)->opt);
  51
  52        if (opt->srr)
  53                memcpy(iph+opt->srr+iph[opt->srr+1]-4, &daddr, 4);
  54
  55        if (!is_frag) {
  56                if (opt->rr_needaddr)
  57                        ip_rt_get_source(iph+opt->rr+iph[opt->rr+2]-5, skb, rt);
  58                if (opt->ts_needaddr)
  59                        ip_rt_get_source(iph+opt->ts+iph[opt->ts+2]-9, skb, rt);
  60                if (opt->ts_needtime) {
  61                        struct timespec tv;
  62                        __be32 midtime;
  63                        getnstimeofday(&tv);
  64                        midtime = htonl((tv.tv_sec % 86400) * MSEC_PER_SEC + tv.tv_nsec / NSEC_PER_MSEC);
  65                        memcpy(iph+opt->ts+iph[opt->ts+2]-5, &midtime, 4);
  66                }
  67                return;
  68        }
  69        if (opt->rr) {
  70                memset(iph+opt->rr, IPOPT_NOP, iph[opt->rr+1]);
  71                opt->rr = 0;
  72                opt->rr_needaddr = 0;
  73        }
  74        if (opt->ts) {
  75                memset(iph+opt->ts, IPOPT_NOP, iph[opt->ts+1]);
  76                opt->ts = 0;
  77                opt->ts_needaddr = opt->ts_needtime = 0;
  78        }
  79}
  80
  81/*
  82 * Provided (sopt, skb) points to received options,
  83 * build in dopt compiled option set appropriate for answering.
  84 * i.e. invert SRR option, copy anothers,
  85 * and grab room in RR/TS options.
  86 *
  87 * NOTE: dopt cannot point to skb.
  88 */
  89
  90int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb)
  91{
  92        const struct ip_options *sopt;
  93        unsigned char *sptr, *dptr;
  94        int soffset, doffset;
  95        int     optlen;
  96
  97        memset(dopt, 0, sizeof(struct ip_options));
  98
  99        sopt = &(IPCB(skb)->opt);
 100
 101        if (sopt->optlen == 0)
 102                return 0;
 103
 104        sptr = skb_network_header(skb);
 105        dptr = dopt->__data;
 106
 107        if (sopt->rr) {
 108                optlen  = sptr[sopt->rr+1];
 109                soffset = sptr[sopt->rr+2];
 110                dopt->rr = dopt->optlen + sizeof(struct iphdr);
 111                memcpy(dptr, sptr+sopt->rr, optlen);
 112                if (sopt->rr_needaddr && soffset <= optlen) {
 113                        if (soffset + 3 > optlen)
 114                                return -EINVAL;
 115                        dptr[2] = soffset + 4;
 116                        dopt->rr_needaddr = 1;
 117                }
 118                dptr += optlen;
 119                dopt->optlen += optlen;
 120        }
 121        if (sopt->ts) {
 122                optlen = sptr[sopt->ts+1];
 123                soffset = sptr[sopt->ts+2];
 124                dopt->ts = dopt->optlen + sizeof(struct iphdr);
 125                memcpy(dptr, sptr+sopt->ts, optlen);
 126                if (soffset <= optlen) {
 127                        if (sopt->ts_needaddr) {
 128                                if (soffset + 3 > optlen)
 129                                        return -EINVAL;
 130                                dopt->ts_needaddr = 1;
 131                                soffset += 4;
 132                        }
 133                        if (sopt->ts_needtime) {
 134                                if (soffset + 3 > optlen)
 135                                        return -EINVAL;
 136                                if ((dptr[3]&0xF) != IPOPT_TS_PRESPEC) {
 137                                        dopt->ts_needtime = 1;
 138                                        soffset += 4;
 139                                } else {
 140                                        dopt->ts_needtime = 0;
 141
 142                                        if (soffset + 7 <= optlen) {
 143                                                __be32 addr;
 144
 145                                                memcpy(&addr, dptr+soffset-1, 4);
 146                                                if (inet_addr_type(dev_net(skb_dst(skb)->dev), addr) != RTN_UNICAST) {
 147                                                        dopt->ts_needtime = 1;
 148                                                        soffset += 8;
 149                                                }
 150                                        }
 151                                }
 152                        }
 153                        dptr[2] = soffset;
 154                }
 155                dptr += optlen;
 156                dopt->optlen += optlen;
 157        }
 158        if (sopt->srr) {
 159                unsigned char *start = sptr+sopt->srr;
 160                __be32 faddr;
 161
 162                optlen  = start[1];
 163                soffset = start[2];
 164                doffset = 0;
 165                if (soffset > optlen)
 166                        soffset = optlen + 1;
 167                soffset -= 4;
 168                if (soffset > 3) {
 169                        memcpy(&faddr, &start[soffset-1], 4);
 170                        for (soffset-=4, doffset=4; soffset > 3; soffset-=4, doffset+=4)
 171                                memcpy(&dptr[doffset-1], &start[soffset-1], 4);
 172                        /*
 173                         * RFC1812 requires to fix illegal source routes.
 174                         */
 175                        if (memcmp(&ip_hdr(skb)->saddr,
 176                                   &start[soffset + 3], 4) == 0)
 177                                doffset -= 4;
 178                }
 179                if (doffset > 3) {
 180                        __be32 daddr = fib_compute_spec_dst(skb);
 181
 182                        memcpy(&start[doffset-1], &daddr, 4);
 183                        dopt->faddr = faddr;
 184                        dptr[0] = start[0];
 185                        dptr[1] = doffset+3;
 186                        dptr[2] = 4;
 187                        dptr += doffset+3;
 188                        dopt->srr = dopt->optlen + sizeof(struct iphdr);
 189                        dopt->optlen += doffset+3;
 190                        dopt->is_strictroute = sopt->is_strictroute;
 191                }
 192        }
 193        if (sopt->cipso) {
 194                optlen  = sptr[sopt->cipso+1];
 195                dopt->cipso = dopt->optlen+sizeof(struct iphdr);
 196                memcpy(dptr, sptr+sopt->cipso, optlen);
 197                dptr += optlen;
 198                dopt->optlen += optlen;
 199        }
 200        while (dopt->optlen & 3) {
 201                *dptr++ = IPOPT_END;
 202                dopt->optlen++;
 203        }
 204        return 0;
 205}
 206
 207/*
 208 *      Options "fragmenting", just fill options not
 209 *      allowed in fragments with NOOPs.
 210 *      Simple and stupid 8), but the most efficient way.
 211 */
 212
 213void ip_options_fragment(struct sk_buff *skb)
 214{
 215        unsigned char *optptr = skb_network_header(skb) + sizeof(struct iphdr);
 216        struct ip_options *opt = &(IPCB(skb)->opt);
 217        int  l = opt->optlen;
 218        int  optlen;
 219
 220        while (l > 0) {
 221                switch (*optptr) {
 222                case IPOPT_END:
 223                        return;
 224                case IPOPT_NOOP:
 225                        l--;
 226                        optptr++;
 227                        continue;
 228                }
 229                optlen = optptr[1];
 230                if (optlen<2 || optlen>l)
 231                  return;
 232                if (!IPOPT_COPIED(*optptr))
 233                        memset(optptr, IPOPT_NOOP, optlen);
 234                l -= optlen;
 235                optptr += optlen;
 236        }
 237        opt->ts = 0;
 238        opt->rr = 0;
 239        opt->rr_needaddr = 0;
 240        opt->ts_needaddr = 0;
 241        opt->ts_needtime = 0;
 242}
 243
 244/* helper used by ip_options_compile() to call fib_compute_spec_dst()
 245 * at most one time.
 246 */
 247static void spec_dst_fill(__be32 *spec_dst, struct sk_buff *skb)
 248{
 249        if (*spec_dst == htonl(INADDR_ANY))
 250                *spec_dst = fib_compute_spec_dst(skb);
 251}
 252
 253/*
 254 * Verify options and fill pointers in struct options.
 255 * Caller should clear *opt, and set opt->data.
 256 * If opt == NULL, then skb->data should point to IP header.
 257 */
 258
 259int ip_options_compile(struct net *net,
 260                       struct ip_options *opt, struct sk_buff *skb)
 261{
 262        __be32 spec_dst = htonl(INADDR_ANY);
 263        unsigned char *pp_ptr = NULL;
 264        struct rtable *rt = NULL;
 265        unsigned char *optptr;
 266        unsigned char *iph;
 267        int optlen, l;
 268
 269        if (skb != NULL) {
 270                rt = skb_rtable(skb);
 271                optptr = (unsigned char *)&(ip_hdr(skb)[1]);
 272        } else
 273                optptr = opt->__data;
 274        iph = optptr - sizeof(struct iphdr);
 275
 276        for (l = opt->optlen; l > 0; ) {
 277                switch (*optptr) {
 278                      case IPOPT_END:
 279                        for (optptr++, l--; l>0; optptr++, l--) {
 280                                if (*optptr != IPOPT_END) {
 281                                        *optptr = IPOPT_END;
 282                                        opt->is_changed = 1;
 283                                }
 284                        }
 285                        goto eol;
 286                      case IPOPT_NOOP:
 287                        l--;
 288                        optptr++;
 289                        continue;
 290                }
 291                optlen = optptr[1];
 292                if (optlen<2 || optlen>l) {
 293                        pp_ptr = optptr;
 294                        goto error;
 295                }
 296                switch (*optptr) {
 297                      case IPOPT_SSRR:
 298                      case IPOPT_LSRR:
 299                        if (optlen < 3) {
 300                                pp_ptr = optptr + 1;
 301                                goto error;
 302                        }
 303                        if (optptr[2] < 4) {
 304                                pp_ptr = optptr + 2;
 305                                goto error;
 306                        }
 307                        /* NB: cf RFC-1812 5.2.4.1 */
 308                        if (opt->srr) {
 309                                pp_ptr = optptr;
 310                                goto error;
 311                        }
 312                        if (!skb) {
 313                                if (optptr[2] != 4 || optlen < 7 || ((optlen-3) & 3)) {
 314                                        pp_ptr = optptr + 1;
 315                                        goto error;
 316                                }
 317                                memcpy(&opt->faddr, &optptr[3], 4);
 318                                if (optlen > 7)
 319                                        memmove(&optptr[3], &optptr[7], optlen-7);
 320                        }
 321                        opt->is_strictroute = (optptr[0] == IPOPT_SSRR);
 322                        opt->srr = optptr - iph;
 323                        break;
 324                      case IPOPT_RR:
 325                        if (opt->rr) {
 326                                pp_ptr = optptr;
 327                                goto error;
 328                        }
 329                        if (optlen < 3) {
 330                                pp_ptr = optptr + 1;
 331                                goto error;
 332                        }
 333                        if (optptr[2] < 4) {
 334                                pp_ptr = optptr + 2;
 335                                goto error;
 336                        }
 337                        if (optptr[2] <= optlen) {
 338                                if (optptr[2]+3 > optlen) {
 339                                        pp_ptr = optptr + 2;
 340                                        goto error;
 341                                }
 342                                if (rt) {
 343                                        spec_dst_fill(&spec_dst, skb);
 344                                        memcpy(&optptr[optptr[2]-1], &spec_dst, 4);
 345                                        opt->is_changed = 1;
 346                                }
 347                                optptr[2] += 4;
 348                                opt->rr_needaddr = 1;
 349                        }
 350                        opt->rr = optptr - iph;
 351                        break;
 352                      case IPOPT_TIMESTAMP:
 353                        if (opt->ts) {
 354                                pp_ptr = optptr;
 355                                goto error;
 356                        }
 357                        if (optlen < 4) {
 358                                pp_ptr = optptr + 1;
 359                                goto error;
 360                        }
 361                        if (optptr[2] < 5) {
 362                                pp_ptr = optptr + 2;
 363                                goto error;
 364                        }
 365                        if (optptr[2] <= optlen) {
 366                                unsigned char *timeptr = NULL;
 367                                if (optptr[2]+3 > optptr[1]) {
 368                                        pp_ptr = optptr + 2;
 369                                        goto error;
 370                                }
 371                                switch (optptr[3]&0xF) {
 372                                      case IPOPT_TS_TSONLY:
 373                                        opt->ts = optptr - iph;
 374                                        if (skb)
 375                                                timeptr = &optptr[optptr[2]-1];
 376                                        opt->ts_needtime = 1;
 377                                        optptr[2] += 4;
 378                                        break;
 379                                      case IPOPT_TS_TSANDADDR:
 380                                        if (optptr[2]+7 > optptr[1]) {
 381                                                pp_ptr = optptr + 2;
 382                                                goto error;
 383                                        }
 384                                        opt->ts = optptr - iph;
 385                                        if (rt)  {
 386                                                spec_dst_fill(&spec_dst, skb);
 387                                                memcpy(&optptr[optptr[2]-1], &spec_dst, 4);
 388                                                timeptr = &optptr[optptr[2]+3];
 389                                        }
 390                                        opt->ts_needaddr = 1;
 391                                        opt->ts_needtime = 1;
 392                                        optptr[2] += 8;
 393                                        break;
 394                                      case IPOPT_TS_PRESPEC:
 395                                        if (optptr[2]+7 > optptr[1]) {
 396                                                pp_ptr = optptr + 2;
 397                                                goto error;
 398                                        }
 399                                        opt->ts = optptr - iph;
 400                                        {
 401                                                __be32 addr;
 402                                                memcpy(&addr, &optptr[optptr[2]-1], 4);
 403                                                if (inet_addr_type(net, addr) == RTN_UNICAST)
 404                                                        break;
 405                                                if (skb)
 406                                                        timeptr = &optptr[optptr[2]+3];
 407                                        }
 408                                        opt->ts_needtime = 1;
 409                                        optptr[2] += 8;
 410                                        break;
 411                                      default:
 412                                        if (!skb && !capable(CAP_NET_RAW)) {
 413                                                pp_ptr = optptr + 3;
 414                                                goto error;
 415                                        }
 416                                        break;
 417                                }
 418                                if (timeptr) {
 419                                        struct timespec tv;
 420                                        u32  midtime;
 421                                        getnstimeofday(&tv);
 422                                        midtime = (tv.tv_sec % 86400) * MSEC_PER_SEC + tv.tv_nsec / NSEC_PER_MSEC;
 423                                        put_unaligned_be32(midtime, timeptr);
 424                                        opt->is_changed = 1;
 425                                }
 426                        } else {
 427                                unsigned int overflow = optptr[3]>>4;
 428                                if (overflow == 15) {
 429                                        pp_ptr = optptr + 3;
 430                                        goto error;
 431                                }
 432                                opt->ts = optptr - iph;
 433                                if (skb) {
 434                                        optptr[3] = (optptr[3]&0xF)|((overflow+1)<<4);
 435                                        opt->is_changed = 1;
 436                                }
 437                        }
 438                        break;
 439                      case IPOPT_RA:
 440                        if (optlen < 4) {
 441                                pp_ptr = optptr + 1;
 442                                goto error;
 443                        }
 444                        if (optptr[2] == 0 && optptr[3] == 0)
 445                                opt->router_alert = optptr - iph;
 446                        break;
 447                      case IPOPT_CIPSO:
 448                        if ((!skb && !capable(CAP_NET_RAW)) || opt->cipso) {
 449                                pp_ptr = optptr;
 450                                goto error;
 451                        }
 452                        opt->cipso = optptr - iph;
 453                        if (cipso_v4_validate(skb, &optptr)) {
 454                                pp_ptr = optptr;
 455                                goto error;
 456                        }
 457                        break;
 458                      case IPOPT_SEC:
 459                      case IPOPT_SID:
 460                      default:
 461                        if (!skb && !capable(CAP_NET_RAW)) {
 462                                pp_ptr = optptr;
 463                                goto error;
 464                        }
 465                        break;
 466                }
 467                l -= optlen;
 468                optptr += optlen;
 469        }
 470
 471eol:
 472        if (!pp_ptr)
 473                return 0;
 474
 475error:
 476        if (skb) {
 477                icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl((pp_ptr-iph)<<24));
 478        }
 479        return -EINVAL;
 480}
 481EXPORT_SYMBOL(ip_options_compile);
 482
 483/*
 484 *      Undo all the changes done by ip_options_compile().
 485 */
 486
 487void ip_options_undo(struct ip_options *opt)
 488{
 489        if (opt->srr) {
 490                unsigned  char *optptr = opt->__data+opt->srr-sizeof(struct  iphdr);
 491                memmove(optptr+7, optptr+3, optptr[1]-7);
 492                memcpy(optptr+3, &opt->faddr, 4);
 493        }
 494        if (opt->rr_needaddr) {
 495                unsigned  char *optptr = opt->__data+opt->rr-sizeof(struct  iphdr);
 496                optptr[2] -= 4;
 497                memset(&optptr[optptr[2]-1], 0, 4);
 498        }
 499        if (opt->ts) {
 500                unsigned  char *optptr = opt->__data+opt->ts-sizeof(struct  iphdr);
 501                if (opt->ts_needtime) {
 502                        optptr[2] -= 4;
 503                        memset(&optptr[optptr[2]-1], 0, 4);
 504                        if ((optptr[3]&0xF) == IPOPT_TS_PRESPEC)
 505                                optptr[2] -= 4;
 506                }
 507                if (opt->ts_needaddr) {
 508                        optptr[2] -= 4;
 509                        memset(&optptr[optptr[2]-1], 0, 4);
 510                }
 511        }
 512}
 513
 514static struct ip_options_rcu *ip_options_get_alloc(const int optlen)
 515{
 516        return kzalloc(sizeof(struct ip_options_rcu) + ((optlen + 3) & ~3),
 517                       GFP_KERNEL);
 518}
 519
 520static int ip_options_get_finish(struct net *net, struct ip_options_rcu **optp,
 521                                 struct ip_options_rcu *opt, int optlen)
 522{
 523        while (optlen & 3)
 524                opt->opt.__data[optlen++] = IPOPT_END;
 525        opt->opt.optlen = optlen;
 526        if (optlen && ip_options_compile(net, &opt->opt, NULL)) {
 527                kfree(opt);
 528                return -EINVAL;
 529        }
 530        kfree(*optp);
 531        *optp = opt;
 532        return 0;
 533}
 534
 535int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
 536                             unsigned char __user *data, int optlen)
 537{
 538        struct ip_options_rcu *opt = ip_options_get_alloc(optlen);
 539
 540        if (!opt)
 541                return -ENOMEM;
 542        if (optlen && copy_from_user(opt->opt.__data, data, optlen)) {
 543                kfree(opt);
 544                return -EFAULT;
 545        }
 546        return ip_options_get_finish(net, optp, opt, optlen);
 547}
 548
 549int ip_options_get(struct net *net, struct ip_options_rcu **optp,
 550                   unsigned char *data, int optlen)
 551{
 552        struct ip_options_rcu *opt = ip_options_get_alloc(optlen);
 553
 554        if (!opt)
 555                return -ENOMEM;
 556        if (optlen)
 557                memcpy(opt->opt.__data, data, optlen);
 558        return ip_options_get_finish(net, optp, opt, optlen);
 559}
 560
 561void ip_forward_options(struct sk_buff *skb)
 562{
 563        struct   ip_options *opt        = &(IPCB(skb)->opt);
 564        unsigned char *optptr;
 565        struct rtable *rt = skb_rtable(skb);
 566        unsigned char *raw = skb_network_header(skb);
 567
 568        if (opt->rr_needaddr) {
 569                optptr = (unsigned char *)raw + opt->rr;
 570                ip_rt_get_source(&optptr[optptr[2]-5], skb, rt);
 571                opt->is_changed = 1;
 572        }
 573        if (opt->srr_is_hit) {
 574                int srrptr, srrspace;
 575
 576                optptr = raw + opt->srr;
 577
 578                for ( srrptr=optptr[2], srrspace = optptr[1];
 579                     srrptr <= srrspace;
 580                     srrptr += 4
 581                     ) {
 582                        if (srrptr + 3 > srrspace)
 583                                break;
 584                        if (memcmp(&opt->nexthop, &optptr[srrptr-1], 4) == 0)
 585                                break;
 586                }
 587                if (srrptr + 3 <= srrspace) {
 588                        opt->is_changed = 1;
 589                        ip_hdr(skb)->daddr = opt->nexthop;
 590                        ip_rt_get_source(&optptr[srrptr-1], skb, rt);
 591                        optptr[2] = srrptr+4;
 592                } else {
 593                        net_crit_ratelimited("%s(): Argh! Destination lost!\n",
 594                                             __func__);
 595                }
 596                if (opt->ts_needaddr) {
 597                        optptr = raw + opt->ts;
 598                        ip_rt_get_source(&optptr[optptr[2]-9], skb, rt);
 599                        opt->is_changed = 1;
 600                }
 601        }
 602        if (opt->is_changed) {
 603                opt->is_changed = 0;
 604                ip_send_check(ip_hdr(skb));
 605        }
 606}
 607
 608int ip_options_rcv_srr(struct sk_buff *skb)
 609{
 610        struct ip_options *opt = &(IPCB(skb)->opt);
 611        int srrspace, srrptr;
 612        __be32 nexthop;
 613        struct iphdr *iph = ip_hdr(skb);
 614        unsigned char *optptr = skb_network_header(skb) + opt->srr;
 615        struct rtable *rt = skb_rtable(skb);
 616        struct rtable *rt2;
 617        unsigned long orefdst;
 618        int err;
 619
 620        if (!rt)
 621                return 0;
 622
 623        if (skb->pkt_type != PACKET_HOST)
 624                return -EINVAL;
 625        if (rt->rt_type == RTN_UNICAST) {
 626                if (!opt->is_strictroute)
 627                        return 0;
 628                icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl(16<<24));
 629                return -EINVAL;
 630        }
 631        if (rt->rt_type != RTN_LOCAL)
 632                return -EINVAL;
 633
 634        for (srrptr=optptr[2], srrspace = optptr[1]; srrptr <= srrspace; srrptr += 4) {
 635                if (srrptr + 3 > srrspace) {
 636                        icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl((opt->srr+2)<<24));
 637                        return -EINVAL;
 638                }
 639                memcpy(&nexthop, &optptr[srrptr-1], 4);
 640
 641                orefdst = skb->_skb_refdst;
 642                skb_dst_set(skb, NULL);
 643                err = ip_route_input(skb, nexthop, iph->saddr, iph->tos, skb->dev);
 644                rt2 = skb_rtable(skb);
 645                if (err || (rt2->rt_type != RTN_UNICAST && rt2->rt_type != RTN_LOCAL)) {
 646                        skb_dst_drop(skb);
 647                        skb->_skb_refdst = orefdst;
 648                        return -EINVAL;
 649                }
 650                refdst_drop(orefdst);
 651                if (rt2->rt_type != RTN_LOCAL)
 652                        break;
 653                /* Superfast 8) loopback forward */
 654                iph->daddr = nexthop;
 655                opt->is_changed = 1;
 656        }
 657        if (srrptr <= srrspace) {
 658                opt->srr_is_hit = 1;
 659                opt->nexthop = nexthop;
 660                opt->is_changed = 1;
 661        }
 662        return 0;
 663}
 664EXPORT_SYMBOL(ip_options_rcv_srr);
 665
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