lib/libc/net/rthdr.c

   1 /*      $KAME: rthdr.c,v 1.8 2001/08/20 02:32:40 itojun Exp $   */
   2
   3 /*
   4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the project nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  * $FreeBSD: src/lib/libc/net/rthdr.c,v 1.2.2.1 2002/04/28 05:40:24 suz Exp $
  32  * $DragonFly: src/lib/libc/net/rthdr.c,v 1.5 2007/05/29 10:58:11 hasso Exp $
  33  */
  34
  35 #include <sys/param.h>
  36 #include <sys/types.h>
  37 #include <sys/socket.h>
  38
  39 #include <netinet/in.h>
  40 #include <netinet/ip6.h>
  41
  42 #include <string.h>
  43 #include <stdio.h>
  44
  45 size_t
  46 inet6_rthdr_space(int type, int seg)
  47 {
  48     switch(type) {
  49      case IPV6_RTHDR_TYPE_0:
  50          if (seg < 1 || seg > 23)
  51              return(0);
  52          return(CMSG_SPACE(sizeof(struct in6_addr) * (seg - 1)
  53                            + sizeof(struct ip6_rthdr0)));
  54      default:
  55 #ifdef DEBUG
  56          fprintf(stderr, "inet6_rthdr_space: unknown type(%d)\n", type);
  57 #endif
  58          return(0);
  59     }
  60 }
  61
  62 struct cmsghdr *
  63 inet6_rthdr_init(void *bp, int type)
  64 {
  65     struct cmsghdr *ch = (struct cmsghdr *)bp;
  66     struct ip6_rthdr *rthdr;
  67
  68     rthdr = (struct ip6_rthdr *)CMSG_DATA(ch);
  69
  70     ch->cmsg_level = IPPROTO_IPV6;
  71     ch->cmsg_type = IPV6_RTHDR;
  72
  73     switch(type) {
  74      case IPV6_RTHDR_TYPE_0:
  75          ch->cmsg_len = CMSG_LEN(sizeof(struct ip6_rthdr0) - sizeof(struct in6_addr));
  76          bzero(rthdr, sizeof(struct ip6_rthdr0));
  77          rthdr->ip6r_type = IPV6_RTHDR_TYPE_0;
  78          return(ch);
  79      default:
  80 #ifdef DEBUG
  81          fprintf(stderr, "inet6_rthdr_init: unknown type(%d)\n", type);
  82 #endif
  83          return(NULL);
  84     }
  85 }
  86
  87 int
  88 inet6_rthdr_add(struct cmsghdr *cmsg, const struct in6_addr *addr, u_int flags)
  89 {
  90     struct ip6_rthdr *rthdr;
  91
  92     rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
  93
  94     switch(rthdr->ip6r_type) {
  95      case IPV6_RTHDR_TYPE_0:
  96      {
  97          struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
  98          if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT) {
  99 #ifdef DEBUG
 100              fprintf(stderr, "inet6_rthdr_add: unsupported flag(%d)\n", flags);
 101 #endif
 102              return(-1);
 103          }
 104          if (rt0->ip6r0_segleft == 23) {
 105 #ifdef DEBUG
 106              fprintf(stderr, "inet6_rthdr_add: segment overflow\n");
 107 #endif
 108              return(-1);
 109          }
 110          if (flags == IPV6_RTHDR_STRICT) {
 111              int c, b;
 112              c = rt0->ip6r0_segleft / 8;
 113              b = rt0->ip6r0_segleft % 8;
 114              rt0->ip6r0_slmap[c] |= (1 << (7 - b));
 115          }
 116          rt0->ip6r0_segleft++;
 117          bcopy(addr, (caddr_t)rt0 + ((rt0->ip6r0_len + 1) << 3),
 118                sizeof(struct in6_addr));
 119          rt0->ip6r0_len += sizeof(struct in6_addr) >> 3;
 120          cmsg->cmsg_len = CMSG_LEN((rt0->ip6r0_len + 1) << 3);
 121          break;
 122      }
 123      default:
 124 #ifdef DEBUG
 125          fprintf(stderr, "inet6_rthdr_add: unknown type(%d)\n",
 126                  rthdr->ip6r_type);
 127 #endif
 128          return(-1);
 129     }
 130
 131     return(0);
 132 }
 133
 134 int
 135 inet6_rthdr_lasthop(struct cmsghdr *cmsg, unsigned int flags)
 136 {
 137     struct ip6_rthdr *rthdr;
 138
 139     rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
 140
 141     switch(rthdr->ip6r_type) {
 142      case IPV6_RTHDR_TYPE_0:
 143      {
 144          struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
 145          if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT) {
 146 #ifdef DEBUG
 147              fprintf(stderr, "inet6_rthdr_lasthop: unsupported flag(%d)\n", flags);
 148 #endif
 149              return(-1);
 150          }
 151          if (rt0->ip6r0_segleft > 23) {
 152 #ifdef DEBUG
 153              fprintf(stderr, "inet6_rthdr_add: segment overflow\n");
 154 #endif
 155              return(-1);
 156          }
 157          if (flags == IPV6_RTHDR_STRICT) {
 158              int c, b;
 159              c = rt0->ip6r0_segleft / 8;
 160              b = rt0->ip6r0_segleft % 8;
 161              rt0->ip6r0_slmap[c] |= (1 << (7 - b));
 162          }
 163          break;
 164      }
 165      default:
 166 #ifdef DEBUG
 167          fprintf(stderr, "inet6_rthdr_lasthop: unknown type(%d)\n",
 168                  rthdr->ip6r_type);
 169 #endif
 170          return(-1);
 171     }
 172
 173     return(0);
 174 }
 175
 176 #if 0
 177 int
 178 inet6_rthdr_reverse(const struct cmsghdr *in, struct cmsghdr *out)
 179 {
 180 #ifdef DEBUG
 181     fprintf(stderr, "inet6_rthdr_reverse: not implemented yet\n");
 182 #endif
 183     return -1;
 184 }
 185 #endif
 186
 187 int
 188 inet6_rthdr_segments(const struct cmsghdr *cmsg)
 189 {
 190     struct ip6_rthdr *rthdr;
 191
 192     rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
 193
 194     switch(rthdr->ip6r_type) {
 195     case IPV6_RTHDR_TYPE_0:
 196       {
 197         struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
 198
 199         if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) {
 200 #ifdef DEBUG
 201             fprintf(stderr, "inet6_rthdr_segments: invalid size(%d)\n",
 202                 rt0->ip6r0_len);
 203 #endif
 204             return -1;
 205         }
 206
 207         return (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
 208       }
 209
 210     default:
 211 #ifdef DEBUG
 212         fprintf(stderr, "inet6_rthdr_segments: unknown type(%d)\n",
 213             rthdr->ip6r_type);
 214 #endif
 215         return -1;
 216     }
 217 }
 218
 219 struct in6_addr *
 220 inet6_rthdr_getaddr(struct cmsghdr *cmsg, int idx)
 221 {
 222     struct ip6_rthdr *rthdr;
 223
 224     rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
 225
 226     switch(rthdr->ip6r_type) {
 227     case IPV6_RTHDR_TYPE_0:
 228       {
 229         struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
 230         int naddr;
 231
 232         if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) {
 233 #ifdef DEBUG
 234             fprintf(stderr, "inet6_rthdr_getaddr: invalid size(%d)\n",
 235                 rt0->ip6r0_len);
 236 #endif
 237             return NULL;
 238         }
 239         naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
 240         if (idx <= 0 || naddr < idx) {
 241 #ifdef DEBUG
 242             fprintf(stderr, "inet6_rthdr_getaddr: invalid idx(%d)\n", idx);
 243 #endif
 244             return NULL;
 245         }
 246         return &rt0->ip6r0_addr[idx - 1];
 247       }
 248
 249     default:
 250 #ifdef DEBUG
 251         fprintf(stderr, "inet6_rthdr_getaddr: unknown type(%d)\n",
 252             rthdr->ip6r_type);
 253 #endif
 254         return NULL;
 255     }
 256 }
 257
 258 int
 259 inet6_rthdr_getflags(const struct cmsghdr *cmsg, int idx)
 260 {
 261     struct ip6_rthdr *rthdr;
 262
 263     rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
 264
 265     switch(rthdr->ip6r_type) {
 266     case IPV6_RTHDR_TYPE_0:
 267       {
 268         struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
 269         int naddr;
 270
 271         if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) {
 272 #ifdef DEBUG
 273             fprintf(stderr, "inet6_rthdr_getflags: invalid size(%d)\n",
 274                 rt0->ip6r0_len);
 275 #endif
 276             return -1;
 277         }
 278         naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
 279         if (idx < 0 || naddr < idx) {
 280 #ifdef DEBUG
 281             fprintf(stderr, "inet6_rthdr_getflags: invalid idx(%d)\n", idx);
 282 #endif
 283             return -1;
 284         }
 285         if (rt0->ip6r0_slmap[idx / 8] & (0x80 >> (idx % 8)))
 286             return IPV6_RTHDR_STRICT;
 287         else
 288             return IPV6_RTHDR_LOOSE;
 289       }
 290
 291     default:
 292 #ifdef DEBUG
 293         fprintf(stderr, "inet6_rthdr_getflags: unknown type(%d)\n",
 294             rthdr->ip6r_type);
 295 #endif
 296         return -1;
 297     }
 298 }
 299
 300 /*
 301  * RFC3542 (2292bis) API
 302  */
 303
 304 socklen_t
 305 inet6_rth_space(int type __unused, int segments __unused)
 306 {
 307         return (0);     /* type not suppported */
 308 }
 309
 310 void *
 311 inet6_rth_init(void *bp __unused, socklen_t bp_len __unused, int type __unused,
 312                int segments __unused)
 313 {
 314         return (NULL);  /* type not supported */
 315 }
 316
 317 int
 318 inet6_rth_add(void *bp __unused, const struct in6_addr *addr __unused)
 319 {
 320         return (-1);    /* type not supported */
 321 }
 322
 323 int
 324 inet6_rth_reverse(const void *in __unused, void *out __unused)
 325 {
 326         return (-1);    /* type not supported */
 327 }
 328
 329 int
 330 inet6_rth_segments(const void *bp __unused)
 331 {
 332         return (-1);    /* type not supported */
 333 }
 334
 335 struct in6_addr *
 336 inet6_rth_getaddr(const void *bp __unused, int idx __unused)
 337 {
 338         return (NULL);  /* type not supported */
 339 }