gen.subproj/rthdr.c

   1 /*
   2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the project nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD: src/lib/libc/net/rthdr.c,v 1.2 2000/03/03 11:12:59 shin Exp $
  30  */
  31
  32 #include <sys/param.h>
  33 #include <sys/types.h>
  34 #include <sys/socket.h>
  35
  36 #include <netinet/in.h>
  37 #include <netinet/ip6.h>
  38
  39 #include <string.h>
  40 #include <stdio.h>
  41
  42 size_t
  43 inet6_rthdr_space(type, seg)
  44     int type, seg;
  45 {
  46     switch(type) {
  47      case IPV6_RTHDR_TYPE_0:
  48          if (seg < 1 || seg > 23)
  49              return(0);
  50          return(CMSG_SPACE(sizeof(struct in6_addr) * (seg - 1)
  51                            + sizeof(struct ip6_rthdr0)));
  52      default:
  53 #ifdef DEBUG
  54          fprintf(stderr, "inet6_rthdr_space: unknown type(%d)\n", type);
  55 #endif
  56          return(0);
  57     }
  58 }
  59
  60 struct cmsghdr *
  61 inet6_rthdr_init(bp, type)
  62     void *bp;
  63     int type;
  64 {
  65     register struct cmsghdr *ch = (struct cmsghdr *)bp;
  66     register 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(cmsg, addr, flags)
  89     struct cmsghdr *cmsg;
  90     const struct in6_addr *addr;
  91     u_int flags;
  92 {
  93     register struct ip6_rthdr *rthdr;
  94
  95     rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
  96
  97     switch(rthdr->ip6r_type) {
  98      case IPV6_RTHDR_TYPE_0:
  99      {
 100          struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
 101          if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT) {
 102 #ifdef DEBUG
 103              fprintf(stderr, "inet6_rthdr_add: unsupported flag(%d)\n", flags);
 104 #endif
 105              return(-1);
 106          }
 107          if (rt0->ip6r0_segleft == 23) {
 108 #ifdef DEBUG
 109              fprintf(stderr, "inet6_rthdr_add: segment overflow\n");
 110 #endif
 111              return(-1);
 112          }
 113          if (flags == IPV6_RTHDR_STRICT) {
 114              int c, b;
 115              c = rt0->ip6r0_segleft / 8;
 116              b = rt0->ip6r0_segleft % 8;
 117              rt0->ip6r0_slmap[c] |= (1 << (7 - b));
 118          }
 119          rt0->ip6r0_segleft++;
 120          bcopy(addr, (caddr_t)rt0 + ((rt0->ip6r0_len + 1) << 3),
 121                sizeof(struct in6_addr));
 122          rt0->ip6r0_len += sizeof(struct in6_addr) >> 3;
 123          cmsg->cmsg_len = CMSG_LEN((rt0->ip6r0_len + 1) << 3);
 124          break;
 125      }
 126      default:
 127 #ifdef DEBUG
 128          fprintf(stderr, "inet6_rthdr_add: unknown type(%d)\n",
 129                  rthdr->ip6r_type);
 130 #endif
 131          return(-1);
 132     }
 133
 134     return(0);
 135 }
 136
 137 int
 138 inet6_rthdr_lasthop(cmsg, flags)
 139     struct cmsghdr *cmsg;
 140     unsigned int flags;
 141 {
 142     register struct ip6_rthdr *rthdr;
 143
 144     rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
 145
 146     switch(rthdr->ip6r_type) {
 147      case IPV6_RTHDR_TYPE_0:
 148      {
 149          struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
 150          if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT) {
 151 #ifdef DEBUG
 152              fprintf(stderr, "inet6_rthdr_lasthop: unsupported flag(%d)\n", flags);
 153 #endif
 154              return(-1);
 155          }
 156          if (rt0->ip6r0_segleft > 23) {
 157 #ifdef DEBUG
 158              fprintf(stderr, "inet6_rthdr_add: segment overflow\n");
 159 #endif
 160              return(-1);
 161          }
 162          if (flags == IPV6_RTHDR_STRICT) {
 163              int c, b;
 164              c = rt0->ip6r0_segleft / 8;
 165              b = rt0->ip6r0_segleft % 8;
 166              rt0->ip6r0_slmap[c] |= (1 << (7 - b));
 167          }
 168          break;
 169      }
 170      default:
 171 #ifdef DEBUG
 172          fprintf(stderr, "inet6_rthdr_lasthop: unknown type(%d)\n",
 173                  rthdr->ip6r_type);
 174 #endif
 175          return(-1);
 176     }
 177
 178     return(0);
 179 }
 180
 181 #if 0
 182 int
 183 inet6_rthdr_reverse(in, out)
 184     const struct cmsghdr *in;
 185     struct cmsghdr *out;
 186 {
 187 #ifdef DEBUG
 188     fprintf(stderr, "inet6_rthdr_reverse: not implemented yet\n");
 189 #endif
 190     return -1;
 191 }
 192 #endif
 193
 194 int
 195 inet6_rthdr_segments(cmsg)
 196     const struct cmsghdr *cmsg;
 197 {
 198     register struct ip6_rthdr *rthdr;
 199
 200     rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
 201
 202     switch(rthdr->ip6r_type) {
 203     case IPV6_RTHDR_TYPE_0:
 204       {
 205         struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
 206
 207         if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) {
 208 #ifdef DEBUG
 209             fprintf(stderr, "inet6_rthdr_segments: invalid size(%d)\n",
 210                 rt0->ip6r0_len);
 211 #endif
 212             return -1;
 213         }
 214
 215         return (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
 216       }
 217
 218     default:
 219 #ifdef DEBUG
 220         fprintf(stderr, "inet6_rthdr_segments: unknown type(%d)\n",
 221             rthdr->ip6r_type);
 222 #endif
 223         return -1;
 224     }
 225 }
 226
 227 struct in6_addr *
 228 inet6_rthdr_getaddr(cmsg, index)
 229     struct cmsghdr *cmsg;
 230     int index;
 231 {
 232     register struct ip6_rthdr *rthdr;
 233
 234     rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
 235
 236     switch(rthdr->ip6r_type) {
 237     case IPV6_RTHDR_TYPE_0:
 238       {
 239         struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
 240         int naddr;
 241
 242         if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) {
 243 #ifdef DEBUG
 244             fprintf(stderr, "inet6_rthdr_getaddr: invalid size(%d)\n",
 245                 rt0->ip6r0_len);
 246 #endif
 247             return NULL;
 248         }
 249         naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
 250         if (index <= 0 || naddr < index) {
 251 #ifdef DEBUG
 252             fprintf(stderr, "inet6_rthdr_getaddr: invalid index(%d)\n", index);
 253 #endif
 254             return NULL;
 255         }
 256         return &rt0->ip6r0_addr[index - 1];
 257       }
 258
 259     default:
 260 #ifdef DEBUG
 261         fprintf(stderr, "inet6_rthdr_getaddr: unknown type(%d)\n",
 262             rthdr->ip6r_type);
 263 #endif
 264         return NULL;
 265     }
 266 }
 267
 268 int
 269 inet6_rthdr_getflags(cmsg, index)
 270     const struct cmsghdr *cmsg;
 271     int index;
 272 {
 273     register struct ip6_rthdr *rthdr;
 274
 275     rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
 276
 277     switch(rthdr->ip6r_type) {
 278     case IPV6_RTHDR_TYPE_0:
 279       {
 280         struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
 281         int naddr;
 282
 283         if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) {
 284 #ifdef DEBUG
 285             fprintf(stderr, "inet6_rthdr_getflags: invalid size(%d)\n",
 286                 rt0->ip6r0_len);
 287 #endif
 288             return -1;
 289         }
 290         naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
 291         if (index < 0 || naddr < index) {
 292 #ifdef DEBUG
 293             fprintf(stderr, "inet6_rthdr_getflags: invalid index(%d)\n", index);
 294 #endif
 295             return -1;
 296         }
 297         if (rt0->ip6r0_slmap[index / 8] & (0x80 >> (index % 8)))
 298             return IPV6_RTHDR_STRICT;
 299         else
 300             return IPV6_RTHDR_LOOSE;
 301       }
 302
 303     default:
 304 #ifdef DEBUG
 305         fprintf(stderr, "inet6_rthdr_getflags: unknown type(%d)\n",
 306             rthdr->ip6r_type);
 307 #endif
 308         return -1;
 309     }
 310 }