| 1 | /* $NetBSD: ip6_output.c,v 1.178 2016/11/10 04:13:53 ozaki-r Exp $ */ |
| 2 | /* $KAME: ip6_output.c,v 1.172 2001/03/25 09:55:56 itojun Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. Neither the name of the project nor the names of its contributors |
| 17 | * may be used to endorse or promote products derived from this software |
| 18 | * without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 30 | * SUCH DAMAGE. |
| 31 | */ |
| 32 | |
| 33 | /* |
| 34 | * Copyright (c) 1982, 1986, 1988, 1990, 1993 |
| 35 | * The Regents of the University of California. All rights reserved. |
| 36 | * |
| 37 | * Redistribution and use in source and binary forms, with or without |
| 38 | * modification, are permitted provided that the following conditions |
| 39 | * are met: |
| 40 | * 1. Redistributions of source code must retain the above copyright |
| 41 | * notice, this list of conditions and the following disclaimer. |
| 42 | * 2. Redistributions in binary form must reproduce the above copyright |
| 43 | * notice, this list of conditions and the following disclaimer in the |
| 44 | * documentation and/or other materials provided with the distribution. |
| 45 | * 3. Neither the name of the University nor the names of its contributors |
| 46 | * may be used to endorse or promote products derived from this software |
| 47 | * without specific prior written permission. |
| 48 | * |
| 49 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 50 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 51 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 52 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 53 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 54 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 55 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 56 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 57 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 58 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 59 | * SUCH DAMAGE. |
| 60 | * |
| 61 | * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 |
| 62 | */ |
| 63 | |
| 64 | #include <sys/cdefs.h> |
| 65 | __KERNEL_RCSID(0, "$NetBSD: ip6_output.c,v 1.178 2016/11/10 04:13:53 ozaki-r Exp $" ); |
| 66 | |
| 67 | #ifdef _KERNEL_OPT |
| 68 | #include "opt_inet.h" |
| 69 | #include "opt_inet6.h" |
| 70 | #include "opt_ipsec.h" |
| 71 | #endif |
| 72 | |
| 73 | #include <sys/param.h> |
| 74 | #include <sys/malloc.h> |
| 75 | #include <sys/mbuf.h> |
| 76 | #include <sys/errno.h> |
| 77 | #include <sys/protosw.h> |
| 78 | #include <sys/socket.h> |
| 79 | #include <sys/socketvar.h> |
| 80 | #include <sys/syslog.h> |
| 81 | #include <sys/systm.h> |
| 82 | #include <sys/proc.h> |
| 83 | #include <sys/kauth.h> |
| 84 | |
| 85 | #include <net/if.h> |
| 86 | #include <net/route.h> |
| 87 | #include <net/pfil.h> |
| 88 | |
| 89 | #include <netinet/in.h> |
| 90 | #include <netinet/in_var.h> |
| 91 | #include <netinet/ip6.h> |
| 92 | #include <netinet/ip_var.h> |
| 93 | #include <netinet/icmp6.h> |
| 94 | #include <netinet/in_offload.h> |
| 95 | #include <netinet/portalgo.h> |
| 96 | #include <netinet6/in6_offload.h> |
| 97 | #include <netinet6/ip6_var.h> |
| 98 | #include <netinet6/ip6_private.h> |
| 99 | #include <netinet6/in6_pcb.h> |
| 100 | #include <netinet6/nd6.h> |
| 101 | #include <netinet6/ip6protosw.h> |
| 102 | #include <netinet6/scope6_var.h> |
| 103 | |
| 104 | #ifdef IPSEC |
| 105 | #include <netipsec/ipsec.h> |
| 106 | #include <netipsec/ipsec6.h> |
| 107 | #include <netipsec/key.h> |
| 108 | #include <netipsec/xform.h> |
| 109 | #endif |
| 110 | |
| 111 | |
| 112 | #include <net/net_osdep.h> |
| 113 | |
| 114 | extern pfil_head_t *inet6_pfil_hook; /* XXX */ |
| 115 | |
| 116 | struct ip6_exthdrs { |
| 117 | struct mbuf *ip6e_ip6; |
| 118 | struct mbuf *ip6e_hbh; |
| 119 | struct mbuf *ip6e_dest1; |
| 120 | struct mbuf *ip6e_rthdr; |
| 121 | struct mbuf *ip6e_dest2; |
| 122 | }; |
| 123 | |
| 124 | static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **, |
| 125 | kauth_cred_t, int); |
| 126 | static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); |
| 127 | static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *, kauth_cred_t, |
| 128 | int, int, int); |
| 129 | static int ip6_setmoptions(const struct sockopt *, struct in6pcb *); |
| 130 | static int ip6_getmoptions(struct sockopt *, struct in6pcb *); |
| 131 | static int ip6_copyexthdr(struct mbuf **, void *, int); |
| 132 | static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int, |
| 133 | struct ip6_frag **); |
| 134 | static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); |
| 135 | static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); |
| 136 | static int ip6_getpmtu(struct rtentry *, struct ifnet *, u_long *, int *); |
| 137 | static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); |
| 138 | static int ip6_ifaddrvalid(const struct in6_addr *); |
| 139 | static int ip6_handle_rthdr(struct ip6_rthdr *, struct ip6_hdr *); |
| 140 | |
| 141 | #ifdef RFC2292 |
| 142 | static int ip6_pcbopts(struct ip6_pktopts **, struct socket *, struct sockopt *); |
| 143 | #endif |
| 144 | |
| 145 | static int |
| 146 | ip6_handle_rthdr(struct ip6_rthdr *rh, struct ip6_hdr *ip6) |
| 147 | { |
| 148 | struct ip6_rthdr0 *rh0; |
| 149 | struct in6_addr *addr; |
| 150 | struct sockaddr_in6 sa; |
| 151 | int error = 0; |
| 152 | |
| 153 | switch (rh->ip6r_type) { |
| 154 | case IPV6_RTHDR_TYPE_0: |
| 155 | rh0 = (struct ip6_rthdr0 *)rh; |
| 156 | addr = (struct in6_addr *)(rh0 + 1); |
| 157 | |
| 158 | /* |
| 159 | * construct a sockaddr_in6 form of the first hop. |
| 160 | * |
| 161 | * XXX we may not have enough information about its scope zone; |
| 162 | * there is no standard API to pass the information from the |
| 163 | * application. |
| 164 | */ |
| 165 | sockaddr_in6_init(&sa, addr, 0, 0, 0); |
| 166 | error = sa6_embedscope(&sa, ip6_use_defzone); |
| 167 | if (error != 0) |
| 168 | break; |
| 169 | (void)memmove(&addr[0], &addr[1], |
| 170 | sizeof(struct in6_addr) * (rh0->ip6r0_segleft - 1)); |
| 171 | addr[rh0->ip6r0_segleft - 1] = ip6->ip6_dst; |
| 172 | ip6->ip6_dst = sa.sin6_addr; |
| 173 | /* XXX */ |
| 174 | in6_clearscope(addr + rh0->ip6r0_segleft - 1); |
| 175 | break; |
| 176 | default: /* is it possible? */ |
| 177 | error = EINVAL; |
| 178 | } |
| 179 | |
| 180 | return error; |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * IP6 output. The packet in mbuf chain m contains a skeletal IP6 |
| 185 | * header (with pri, len, nxt, hlim, src, dst). |
| 186 | * This function may modify ver and hlim only. |
| 187 | * The mbuf chain containing the packet will be freed. |
| 188 | * The mbuf opt, if present, will not be freed. |
| 189 | * |
| 190 | * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and |
| 191 | * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, |
| 192 | * which is rt_rmx.rmx_mtu. |
| 193 | */ |
| 194 | int |
| 195 | ip6_output( |
| 196 | struct mbuf *m0, |
| 197 | struct ip6_pktopts *opt, |
| 198 | struct route *ro, |
| 199 | int flags, |
| 200 | struct ip6_moptions *im6o, |
| 201 | struct socket *so, |
| 202 | struct ifnet **ifpp /* XXX: just for statistics */ |
| 203 | ) |
| 204 | { |
| 205 | struct ip6_hdr *ip6, *mhip6; |
| 206 | struct ifnet *ifp = NULL, *origifp = NULL; |
| 207 | struct mbuf *m = m0; |
| 208 | int hlen, tlen, len, off; |
| 209 | bool tso; |
| 210 | struct route ip6route; |
| 211 | struct rtentry *rt = NULL, *rt_pmtu; |
| 212 | const struct sockaddr_in6 *dst; |
| 213 | struct sockaddr_in6 src_sa, dst_sa; |
| 214 | int error = 0; |
| 215 | struct in6_ifaddr *ia = NULL; |
| 216 | u_long mtu; |
| 217 | int alwaysfrag, dontfrag; |
| 218 | u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; |
| 219 | struct ip6_exthdrs exthdrs; |
| 220 | struct in6_addr finaldst, src0, dst0; |
| 221 | u_int32_t zone; |
| 222 | struct route *ro_pmtu = NULL; |
| 223 | int hdrsplit = 0; |
| 224 | int needipsec = 0; |
| 225 | #ifdef IPSEC |
| 226 | struct secpolicy *sp = NULL; |
| 227 | #endif |
| 228 | struct psref psref, psref_ia; |
| 229 | int bound = curlwp_bind(); |
| 230 | bool release_psref_ia = false; |
| 231 | |
| 232 | #ifdef DIAGNOSTIC |
| 233 | if ((m->m_flags & M_PKTHDR) == 0) |
| 234 | panic("ip6_output: no HDR" ); |
| 235 | |
| 236 | if ((m->m_pkthdr.csum_flags & |
| 237 | (M_CSUM_TCPv4|M_CSUM_UDPv4|M_CSUM_TSOv4)) != 0) { |
| 238 | panic("ip6_output: IPv4 checksum offload flags: %d" , |
| 239 | m->m_pkthdr.csum_flags); |
| 240 | } |
| 241 | |
| 242 | if ((m->m_pkthdr.csum_flags & (M_CSUM_TCPv6|M_CSUM_UDPv6)) == |
| 243 | (M_CSUM_TCPv6|M_CSUM_UDPv6)) { |
| 244 | panic("ip6_output: conflicting checksum offload flags: %d" , |
| 245 | m->m_pkthdr.csum_flags); |
| 246 | } |
| 247 | #endif |
| 248 | |
| 249 | M_CSUM_DATA_IPv6_HL_SET(m->m_pkthdr.csum_data, sizeof(struct ip6_hdr)); |
| 250 | |
| 251 | #define MAKE_EXTHDR(hp, mp) \ |
| 252 | do { \ |
| 253 | if (hp) { \ |
| 254 | struct ip6_ext *eh = (struct ip6_ext *)(hp); \ |
| 255 | error = ip6_copyexthdr((mp), (void *)(hp), \ |
| 256 | ((eh)->ip6e_len + 1) << 3); \ |
| 257 | if (error) \ |
| 258 | goto freehdrs; \ |
| 259 | } \ |
| 260 | } while (/*CONSTCOND*/ 0) |
| 261 | |
| 262 | memset(&exthdrs, 0, sizeof(exthdrs)); |
| 263 | if (opt) { |
| 264 | /* Hop-by-Hop options header */ |
| 265 | MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); |
| 266 | /* Destination options header(1st part) */ |
| 267 | MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); |
| 268 | /* Routing header */ |
| 269 | MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); |
| 270 | /* Destination options header(2nd part) */ |
| 271 | MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); |
| 272 | } |
| 273 | |
| 274 | /* |
| 275 | * Calculate the total length of the extension header chain. |
| 276 | * Keep the length of the unfragmentable part for fragmentation. |
| 277 | */ |
| 278 | optlen = 0; |
| 279 | if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; |
| 280 | if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; |
| 281 | if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; |
| 282 | unfragpartlen = optlen + sizeof(struct ip6_hdr); |
| 283 | /* NOTE: we don't add AH/ESP length here. do that later. */ |
| 284 | if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; |
| 285 | |
| 286 | #ifdef IPSEC |
| 287 | if (ipsec_used) { |
| 288 | /* Check the security policy (SP) for the packet */ |
| 289 | |
| 290 | sp = ipsec6_check_policy(m, so, flags, &needipsec, &error); |
| 291 | if (error != 0) { |
| 292 | /* |
| 293 | * Hack: -EINVAL is used to signal that a packet |
| 294 | * should be silently discarded. This is typically |
| 295 | * because we asked key management for an SA and |
| 296 | * it was delayed (e.g. kicked up to IKE). |
| 297 | */ |
| 298 | if (error == -EINVAL) |
| 299 | error = 0; |
| 300 | goto freehdrs; |
| 301 | } |
| 302 | } |
| 303 | #endif /* IPSEC */ |
| 304 | |
| 305 | |
| 306 | if (needipsec && |
| 307 | (m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0) { |
| 308 | in6_delayed_cksum(m); |
| 309 | m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); |
| 310 | } |
| 311 | |
| 312 | |
| 313 | /* |
| 314 | * If we need IPsec, or there is at least one extension header, |
| 315 | * separate IP6 header from the payload. |
| 316 | */ |
| 317 | if ((needipsec || optlen) && !hdrsplit) { |
| 318 | if ((error = ip6_splithdr(m, &exthdrs)) != 0) { |
| 319 | m = NULL; |
| 320 | goto freehdrs; |
| 321 | } |
| 322 | m = exthdrs.ip6e_ip6; |
| 323 | hdrsplit++; |
| 324 | } |
| 325 | |
| 326 | /* adjust pointer */ |
| 327 | ip6 = mtod(m, struct ip6_hdr *); |
| 328 | |
| 329 | /* adjust mbuf packet header length */ |
| 330 | m->m_pkthdr.len += optlen; |
| 331 | plen = m->m_pkthdr.len - sizeof(*ip6); |
| 332 | |
| 333 | /* If this is a jumbo payload, insert a jumbo payload option. */ |
| 334 | if (plen > IPV6_MAXPACKET) { |
| 335 | if (!hdrsplit) { |
| 336 | if ((error = ip6_splithdr(m, &exthdrs)) != 0) { |
| 337 | m = NULL; |
| 338 | goto freehdrs; |
| 339 | } |
| 340 | m = exthdrs.ip6e_ip6; |
| 341 | hdrsplit++; |
| 342 | } |
| 343 | /* adjust pointer */ |
| 344 | ip6 = mtod(m, struct ip6_hdr *); |
| 345 | if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) |
| 346 | goto freehdrs; |
| 347 | optlen += 8; /* XXX JUMBOOPTLEN */ |
| 348 | ip6->ip6_plen = 0; |
| 349 | } else |
| 350 | ip6->ip6_plen = htons(plen); |
| 351 | |
| 352 | /* |
| 353 | * Concatenate headers and fill in next header fields. |
| 354 | * Here we have, on "m" |
| 355 | * IPv6 payload |
| 356 | * and we insert headers accordingly. Finally, we should be getting: |
| 357 | * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] |
| 358 | * |
| 359 | * during the header composing process, "m" points to IPv6 header. |
| 360 | * "mprev" points to an extension header prior to esp. |
| 361 | */ |
| 362 | { |
| 363 | u_char *nexthdrp = &ip6->ip6_nxt; |
| 364 | struct mbuf *mprev = m; |
| 365 | |
| 366 | /* |
| 367 | * we treat dest2 specially. this makes IPsec processing |
| 368 | * much easier. the goal here is to make mprev point the |
| 369 | * mbuf prior to dest2. |
| 370 | * |
| 371 | * result: IPv6 dest2 payload |
| 372 | * m and mprev will point to IPv6 header. |
| 373 | */ |
| 374 | if (exthdrs.ip6e_dest2) { |
| 375 | if (!hdrsplit) |
| 376 | panic("assumption failed: hdr not split" ); |
| 377 | exthdrs.ip6e_dest2->m_next = m->m_next; |
| 378 | m->m_next = exthdrs.ip6e_dest2; |
| 379 | *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; |
| 380 | ip6->ip6_nxt = IPPROTO_DSTOPTS; |
| 381 | } |
| 382 | |
| 383 | #define MAKE_CHAIN(m, mp, p, i)\ |
| 384 | do {\ |
| 385 | if (m) {\ |
| 386 | if (!hdrsplit) \ |
| 387 | panic("assumption failed: hdr not split"); \ |
| 388 | *mtod((m), u_char *) = *(p);\ |
| 389 | *(p) = (i);\ |
| 390 | p = mtod((m), u_char *);\ |
| 391 | (m)->m_next = (mp)->m_next;\ |
| 392 | (mp)->m_next = (m);\ |
| 393 | (mp) = (m);\ |
| 394 | }\ |
| 395 | } while (/*CONSTCOND*/ 0) |
| 396 | /* |
| 397 | * result: IPv6 hbh dest1 rthdr dest2 payload |
| 398 | * m will point to IPv6 header. mprev will point to the |
| 399 | * extension header prior to dest2 (rthdr in the above case). |
| 400 | */ |
| 401 | MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); |
| 402 | MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, |
| 403 | IPPROTO_DSTOPTS); |
| 404 | MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, |
| 405 | IPPROTO_ROUTING); |
| 406 | |
| 407 | M_CSUM_DATA_IPv6_HL_SET(m->m_pkthdr.csum_data, |
| 408 | sizeof(struct ip6_hdr) + optlen); |
| 409 | } |
| 410 | |
| 411 | /* Need to save for pmtu */ |
| 412 | finaldst = ip6->ip6_dst; |
| 413 | |
| 414 | /* |
| 415 | * If there is a routing header, replace destination address field |
| 416 | * with the first hop of the routing header. |
| 417 | */ |
| 418 | if (exthdrs.ip6e_rthdr) { |
| 419 | struct ip6_rthdr *rh; |
| 420 | |
| 421 | rh = (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, |
| 422 | struct ip6_rthdr *)); |
| 423 | |
| 424 | error = ip6_handle_rthdr(rh, ip6); |
| 425 | if (error != 0) |
| 426 | goto bad; |
| 427 | } |
| 428 | |
| 429 | /* Source address validation */ |
| 430 | if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && |
| 431 | (flags & IPV6_UNSPECSRC) == 0) { |
| 432 | error = EOPNOTSUPP; |
| 433 | IP6_STATINC(IP6_STAT_BADSCOPE); |
| 434 | goto bad; |
| 435 | } |
| 436 | if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { |
| 437 | error = EOPNOTSUPP; |
| 438 | IP6_STATINC(IP6_STAT_BADSCOPE); |
| 439 | goto bad; |
| 440 | } |
| 441 | |
| 442 | IP6_STATINC(IP6_STAT_LOCALOUT); |
| 443 | |
| 444 | /* |
| 445 | * Route packet. |
| 446 | */ |
| 447 | /* initialize cached route */ |
| 448 | if (ro == NULL) { |
| 449 | memset(&ip6route, 0, sizeof(ip6route)); |
| 450 | ro = &ip6route; |
| 451 | } |
| 452 | ro_pmtu = ro; |
| 453 | if (opt && opt->ip6po_rthdr) |
| 454 | ro = &opt->ip6po_route; |
| 455 | |
| 456 | /* |
| 457 | * if specified, try to fill in the traffic class field. |
| 458 | * do not override if a non-zero value is already set. |
| 459 | * we check the diffserv field and the ecn field separately. |
| 460 | */ |
| 461 | if (opt && opt->ip6po_tclass >= 0) { |
| 462 | int mask = 0; |
| 463 | |
| 464 | if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) |
| 465 | mask |= 0xfc; |
| 466 | if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) |
| 467 | mask |= 0x03; |
| 468 | if (mask != 0) |
| 469 | ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); |
| 470 | } |
| 471 | |
| 472 | /* fill in or override the hop limit field, if necessary. */ |
| 473 | if (opt && opt->ip6po_hlim != -1) |
| 474 | ip6->ip6_hlim = opt->ip6po_hlim & 0xff; |
| 475 | else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { |
| 476 | if (im6o != NULL) |
| 477 | ip6->ip6_hlim = im6o->im6o_multicast_hlim; |
| 478 | else |
| 479 | ip6->ip6_hlim = ip6_defmcasthlim; |
| 480 | } |
| 481 | |
| 482 | #ifdef IPSEC |
| 483 | if (needipsec) { |
| 484 | int s = splsoftnet(); |
| 485 | error = ipsec6_process_packet(m, sp->req); |
| 486 | |
| 487 | /* |
| 488 | * Preserve KAME behaviour: ENOENT can be returned |
| 489 | * when an SA acquire is in progress. Don't propagate |
| 490 | * this to user-level; it confuses applications. |
| 491 | * XXX this will go away when the SADB is redone. |
| 492 | */ |
| 493 | if (error == ENOENT) |
| 494 | error = 0; |
| 495 | splx(s); |
| 496 | goto done; |
| 497 | } |
| 498 | #endif /* IPSEC */ |
| 499 | |
| 500 | /* adjust pointer */ |
| 501 | ip6 = mtod(m, struct ip6_hdr *); |
| 502 | |
| 503 | sockaddr_in6_init(&dst_sa, &ip6->ip6_dst, 0, 0, 0); |
| 504 | |
| 505 | /* We do not need a route for multicast */ |
| 506 | if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { |
| 507 | struct in6_pktinfo *pi = NULL; |
| 508 | |
| 509 | /* |
| 510 | * If the outgoing interface for the address is specified by |
| 511 | * the caller, use it. |
| 512 | */ |
| 513 | if (opt && (pi = opt->ip6po_pktinfo) != NULL) { |
| 514 | /* XXX boundary check is assumed to be already done. */ |
| 515 | ifp = if_get_byindex(pi->ipi6_ifindex, &psref); |
| 516 | } else if (im6o != NULL) { |
| 517 | ifp = if_get_byindex(im6o->im6o_multicast_if_index, |
| 518 | &psref); |
| 519 | } |
| 520 | } |
| 521 | |
| 522 | if (ifp == NULL) { |
| 523 | error = in6_selectroute(&dst_sa, opt, &ro, &rt, true); |
| 524 | if (error != 0) |
| 525 | goto bad; |
| 526 | ifp = if_get_byindex(rt->rt_ifp->if_index, &psref); |
| 527 | } |
| 528 | |
| 529 | if (rt == NULL) { |
| 530 | /* |
| 531 | * If in6_selectroute() does not return a route entry, |
| 532 | * dst may not have been updated. |
| 533 | */ |
| 534 | error = rtcache_setdst(ro, sin6tosa(&dst_sa)); |
| 535 | if (error) { |
| 536 | goto bad; |
| 537 | } |
| 538 | } |
| 539 | |
| 540 | /* |
| 541 | * then rt (for unicast) and ifp must be non-NULL valid values. |
| 542 | */ |
| 543 | if ((flags & IPV6_FORWARDING) == 0) { |
| 544 | /* XXX: the FORWARDING flag can be set for mrouting. */ |
| 545 | in6_ifstat_inc(ifp, ifs6_out_request); |
| 546 | } |
| 547 | if (rt != NULL) { |
| 548 | ia = (struct in6_ifaddr *)(rt->rt_ifa); |
| 549 | rt->rt_use++; |
| 550 | } |
| 551 | |
| 552 | /* |
| 553 | * The outgoing interface must be in the zone of source and |
| 554 | * destination addresses. We should use ia_ifp to support the |
| 555 | * case of sending packets to an address of our own. |
| 556 | */ |
| 557 | if (ia != NULL && ia->ia_ifp) { |
| 558 | origifp = ia->ia_ifp; |
| 559 | if (if_is_deactivated(origifp)) |
| 560 | goto bad; |
| 561 | if_acquire_NOMPSAFE(origifp, &psref_ia); |
| 562 | release_psref_ia = true; |
| 563 | } else |
| 564 | origifp = ifp; |
| 565 | |
| 566 | src0 = ip6->ip6_src; |
| 567 | if (in6_setscope(&src0, origifp, &zone)) |
| 568 | goto badscope; |
| 569 | sockaddr_in6_init(&src_sa, &ip6->ip6_src, 0, 0, 0); |
| 570 | if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) |
| 571 | goto badscope; |
| 572 | |
| 573 | dst0 = ip6->ip6_dst; |
| 574 | if (in6_setscope(&dst0, origifp, &zone)) |
| 575 | goto badscope; |
| 576 | /* re-initialize to be sure */ |
| 577 | sockaddr_in6_init(&dst_sa, &ip6->ip6_dst, 0, 0, 0); |
| 578 | if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) |
| 579 | goto badscope; |
| 580 | |
| 581 | /* scope check is done. */ |
| 582 | |
| 583 | /* Ensure we only send from a valid address. */ |
| 584 | if ((error = ip6_ifaddrvalid(&src0)) != 0) { |
| 585 | nd6log(LOG_ERR, |
| 586 | "refusing to send from invalid address %s (pid %d)\n" , |
| 587 | ip6_sprintf(&src0), curproc->p_pid); |
| 588 | IP6_STATINC(IP6_STAT_ODROPPED); |
| 589 | in6_ifstat_inc(origifp, ifs6_out_discard); |
| 590 | if (error == 1) |
| 591 | /* |
| 592 | * Address exists, but is tentative or detached. |
| 593 | * We can't send from it because it's invalid, |
| 594 | * so we drop the packet. |
| 595 | */ |
| 596 | error = 0; |
| 597 | else |
| 598 | error = EADDRNOTAVAIL; |
| 599 | goto bad; |
| 600 | } |
| 601 | |
| 602 | if (rt != NULL && (rt->rt_flags & RTF_GATEWAY) && |
| 603 | !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) |
| 604 | dst = satocsin6(rt->rt_gateway); |
| 605 | else |
| 606 | dst = satocsin6(rtcache_getdst(ro)); |
| 607 | |
| 608 | /* |
| 609 | * XXXXXX: original code follows: |
| 610 | */ |
| 611 | if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) |
| 612 | m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ |
| 613 | else { |
| 614 | struct in6_multi *in6m; |
| 615 | |
| 616 | m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; |
| 617 | |
| 618 | in6_ifstat_inc(ifp, ifs6_out_mcast); |
| 619 | |
| 620 | /* |
| 621 | * Confirm that the outgoing interface supports multicast. |
| 622 | */ |
| 623 | if (!(ifp->if_flags & IFF_MULTICAST)) { |
| 624 | IP6_STATINC(IP6_STAT_NOROUTE); |
| 625 | in6_ifstat_inc(ifp, ifs6_out_discard); |
| 626 | error = ENETUNREACH; |
| 627 | goto bad; |
| 628 | } |
| 629 | |
| 630 | IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); |
| 631 | if (in6m != NULL && |
| 632 | (im6o == NULL || im6o->im6o_multicast_loop)) { |
| 633 | /* |
| 634 | * If we belong to the destination multicast group |
| 635 | * on the outgoing interface, and the caller did not |
| 636 | * forbid loopback, loop back a copy. |
| 637 | */ |
| 638 | KASSERT(dst != NULL); |
| 639 | ip6_mloopback(ifp, m, dst); |
| 640 | } else { |
| 641 | /* |
| 642 | * If we are acting as a multicast router, perform |
| 643 | * multicast forwarding as if the packet had just |
| 644 | * arrived on the interface to which we are about |
| 645 | * to send. The multicast forwarding function |
| 646 | * recursively calls this function, using the |
| 647 | * IPV6_FORWARDING flag to prevent infinite recursion. |
| 648 | * |
| 649 | * Multicasts that are looped back by ip6_mloopback(), |
| 650 | * above, will be forwarded by the ip6_input() routine, |
| 651 | * if necessary. |
| 652 | */ |
| 653 | if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { |
| 654 | if (ip6_mforward(ip6, ifp, m) != 0) { |
| 655 | m_freem(m); |
| 656 | goto done; |
| 657 | } |
| 658 | } |
| 659 | } |
| 660 | /* |
| 661 | * Multicasts with a hoplimit of zero may be looped back, |
| 662 | * above, but must not be transmitted on a network. |
| 663 | * Also, multicasts addressed to the loopback interface |
| 664 | * are not sent -- the above call to ip6_mloopback() will |
| 665 | * loop back a copy if this host actually belongs to the |
| 666 | * destination group on the loopback interface. |
| 667 | */ |
| 668 | if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || |
| 669 | IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { |
| 670 | m_freem(m); |
| 671 | goto done; |
| 672 | } |
| 673 | } |
| 674 | |
| 675 | /* |
| 676 | * Fill the outgoing inteface to tell the upper layer |
| 677 | * to increment per-interface statistics. |
| 678 | */ |
| 679 | if (ifpp) |
| 680 | *ifpp = ifp; |
| 681 | |
| 682 | /* Determine path MTU. */ |
| 683 | /* |
| 684 | * ro_pmtu represent final destination while |
| 685 | * ro might represent immediate destination. |
| 686 | * Use ro_pmtu destination since MTU might differ. |
| 687 | */ |
| 688 | if (ro_pmtu != ro) { |
| 689 | union { |
| 690 | struct sockaddr dst; |
| 691 | struct sockaddr_in6 dst6; |
| 692 | } u; |
| 693 | |
| 694 | /* ro_pmtu may not have a cache */ |
| 695 | sockaddr_in6_init(&u.dst6, &finaldst, 0, 0, 0); |
| 696 | rt_pmtu = rtcache_lookup(ro_pmtu, &u.dst); |
| 697 | } else |
| 698 | rt_pmtu = rtcache_validate(ro_pmtu); |
| 699 | error = ip6_getpmtu(rt_pmtu, ifp, &mtu, &alwaysfrag); |
| 700 | if (error != 0) |
| 701 | goto bad; |
| 702 | |
| 703 | /* |
| 704 | * The caller of this function may specify to use the minimum MTU |
| 705 | * in some cases. |
| 706 | * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU |
| 707 | * setting. The logic is a bit complicated; by default, unicast |
| 708 | * packets will follow path MTU while multicast packets will be sent at |
| 709 | * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets |
| 710 | * including unicast ones will be sent at the minimum MTU. Multicast |
| 711 | * packets will always be sent at the minimum MTU unless |
| 712 | * IP6PO_MINMTU_DISABLE is explicitly specified. |
| 713 | * See RFC 3542 for more details. |
| 714 | */ |
| 715 | if (mtu > IPV6_MMTU) { |
| 716 | if ((flags & IPV6_MINMTU)) |
| 717 | mtu = IPV6_MMTU; |
| 718 | else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) |
| 719 | mtu = IPV6_MMTU; |
| 720 | else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && |
| 721 | (opt == NULL || |
| 722 | opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { |
| 723 | mtu = IPV6_MMTU; |
| 724 | } |
| 725 | } |
| 726 | |
| 727 | /* |
| 728 | * clear embedded scope identifiers if necessary. |
| 729 | * in6_clearscope will touch the addresses only when necessary. |
| 730 | */ |
| 731 | in6_clearscope(&ip6->ip6_src); |
| 732 | in6_clearscope(&ip6->ip6_dst); |
| 733 | |
| 734 | /* |
| 735 | * If the outgoing packet contains a hop-by-hop options header, |
| 736 | * it must be examined and processed even by the source node. |
| 737 | * (RFC 2460, section 4.) |
| 738 | */ |
| 739 | if (ip6->ip6_nxt == IPV6_HOPOPTS) { |
| 740 | u_int32_t dummy1; /* XXX unused */ |
| 741 | u_int32_t dummy2; /* XXX unused */ |
| 742 | int hoff = sizeof(struct ip6_hdr); |
| 743 | |
| 744 | if (ip6_hopopts_input(&dummy1, &dummy2, &m, &hoff)) { |
| 745 | /* m was already freed at this point */ |
| 746 | error = EINVAL;/* better error? */ |
| 747 | goto done; |
| 748 | } |
| 749 | |
| 750 | ip6 = mtod(m, struct ip6_hdr *); |
| 751 | } |
| 752 | |
| 753 | /* |
| 754 | * Run through list of hooks for output packets. |
| 755 | */ |
| 756 | if ((error = pfil_run_hooks(inet6_pfil_hook, &m, ifp, PFIL_OUT)) != 0) |
| 757 | goto done; |
| 758 | if (m == NULL) |
| 759 | goto done; |
| 760 | ip6 = mtod(m, struct ip6_hdr *); |
| 761 | |
| 762 | /* |
| 763 | * Send the packet to the outgoing interface. |
| 764 | * If necessary, do IPv6 fragmentation before sending. |
| 765 | * |
| 766 | * the logic here is rather complex: |
| 767 | * 1: normal case (dontfrag == 0, alwaysfrag == 0) |
| 768 | * 1-a: send as is if tlen <= path mtu |
| 769 | * 1-b: fragment if tlen > path mtu |
| 770 | * |
| 771 | * 2: if user asks us not to fragment (dontfrag == 1) |
| 772 | * 2-a: send as is if tlen <= interface mtu |
| 773 | * 2-b: error if tlen > interface mtu |
| 774 | * |
| 775 | * 3: if we always need to attach fragment header (alwaysfrag == 1) |
| 776 | * always fragment |
| 777 | * |
| 778 | * 4: if dontfrag == 1 && alwaysfrag == 1 |
| 779 | * error, as we cannot handle this conflicting request |
| 780 | */ |
| 781 | tlen = m->m_pkthdr.len; |
| 782 | tso = (m->m_pkthdr.csum_flags & M_CSUM_TSOv6) != 0; |
| 783 | if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) |
| 784 | dontfrag = 1; |
| 785 | else |
| 786 | dontfrag = 0; |
| 787 | |
| 788 | if (dontfrag && alwaysfrag) { /* case 4 */ |
| 789 | /* conflicting request - can't transmit */ |
| 790 | error = EMSGSIZE; |
| 791 | goto bad; |
| 792 | } |
| 793 | if (dontfrag && (!tso && tlen > IN6_LINKMTU(ifp))) { /* case 2-b */ |
| 794 | /* |
| 795 | * Even if the DONTFRAG option is specified, we cannot send the |
| 796 | * packet when the data length is larger than the MTU of the |
| 797 | * outgoing interface. |
| 798 | * Notify the error by sending IPV6_PATHMTU ancillary data as |
| 799 | * well as returning an error code (the latter is not described |
| 800 | * in the API spec.) |
| 801 | */ |
| 802 | u_int32_t mtu32; |
| 803 | struct ip6ctlparam ip6cp; |
| 804 | |
| 805 | mtu32 = (u_int32_t)mtu; |
| 806 | memset(&ip6cp, 0, sizeof(ip6cp)); |
| 807 | ip6cp.ip6c_cmdarg = (void *)&mtu32; |
| 808 | pfctlinput2(PRC_MSGSIZE, |
| 809 | rtcache_getdst(ro_pmtu), &ip6cp); |
| 810 | |
| 811 | error = EMSGSIZE; |
| 812 | goto bad; |
| 813 | } |
| 814 | |
| 815 | /* |
| 816 | * transmit packet without fragmentation |
| 817 | */ |
| 818 | if (dontfrag || (!alwaysfrag && (tlen <= mtu || tso))) { |
| 819 | /* case 1-a and 2-a */ |
| 820 | struct in6_ifaddr *ia6; |
| 821 | int sw_csum; |
| 822 | int s; |
| 823 | |
| 824 | ip6 = mtod(m, struct ip6_hdr *); |
| 825 | s = pserialize_read_enter(); |
| 826 | ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); |
| 827 | if (ia6) { |
| 828 | /* Record statistics for this interface address. */ |
| 829 | ia6->ia_ifa.ifa_data.ifad_outbytes += m->m_pkthdr.len; |
| 830 | } |
| 831 | pserialize_read_exit(s); |
| 832 | |
| 833 | sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_csum_flags_tx; |
| 834 | if ((sw_csum & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0) { |
| 835 | if (IN6_NEED_CHECKSUM(ifp, |
| 836 | sw_csum & (M_CSUM_UDPv6|M_CSUM_TCPv6))) { |
| 837 | in6_delayed_cksum(m); |
| 838 | } |
| 839 | m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); |
| 840 | } |
| 841 | |
| 842 | KASSERT(dst != NULL); |
| 843 | if (__predict_true(!tso || |
| 844 | (ifp->if_capenable & IFCAP_TSOv6) != 0)) { |
| 845 | error = nd6_output(ifp, origifp, m, dst, rt); |
| 846 | } else { |
| 847 | error = ip6_tso_output(ifp, origifp, m, dst, rt); |
| 848 | } |
| 849 | goto done; |
| 850 | } |
| 851 | |
| 852 | if (tso) { |
| 853 | error = EINVAL; /* XXX */ |
| 854 | goto bad; |
| 855 | } |
| 856 | |
| 857 | /* |
| 858 | * try to fragment the packet. case 1-b and 3 |
| 859 | */ |
| 860 | if (mtu < IPV6_MMTU) { |
| 861 | /* path MTU cannot be less than IPV6_MMTU */ |
| 862 | error = EMSGSIZE; |
| 863 | in6_ifstat_inc(ifp, ifs6_out_fragfail); |
| 864 | goto bad; |
| 865 | } else if (ip6->ip6_plen == 0) { |
| 866 | /* jumbo payload cannot be fragmented */ |
| 867 | error = EMSGSIZE; |
| 868 | in6_ifstat_inc(ifp, ifs6_out_fragfail); |
| 869 | goto bad; |
| 870 | } else { |
| 871 | struct mbuf **mnext, *m_frgpart; |
| 872 | struct ip6_frag *ip6f; |
| 873 | u_int32_t id = htonl(ip6_randomid()); |
| 874 | u_char nextproto; |
| 875 | #if 0 /* see below */ |
| 876 | struct ip6ctlparam ip6cp; |
| 877 | u_int32_t mtu32; |
| 878 | #endif |
| 879 | |
| 880 | /* |
| 881 | * Too large for the destination or interface; |
| 882 | * fragment if possible. |
| 883 | * Must be able to put at least 8 bytes per fragment. |
| 884 | */ |
| 885 | hlen = unfragpartlen; |
| 886 | if (mtu > IPV6_MAXPACKET) |
| 887 | mtu = IPV6_MAXPACKET; |
| 888 | |
| 889 | #if 0 |
| 890 | /* |
| 891 | * It is believed this code is a leftover from the |
| 892 | * development of the IPV6_RECVPATHMTU sockopt and |
| 893 | * associated work to implement RFC3542. |
| 894 | * It's not entirely clear what the intent of the API |
| 895 | * is at this point, so disable this code for now. |
| 896 | * The IPV6_RECVPATHMTU sockopt and/or IPV6_DONTFRAG |
| 897 | * will send notifications if the application requests. |
| 898 | */ |
| 899 | |
| 900 | /* Notify a proper path MTU to applications. */ |
| 901 | mtu32 = (u_int32_t)mtu; |
| 902 | memset(&ip6cp, 0, sizeof(ip6cp)); |
| 903 | ip6cp.ip6c_cmdarg = (void *)&mtu32; |
| 904 | pfctlinput2(PRC_MSGSIZE, |
| 905 | rtcache_getdst(ro_pmtu), &ip6cp); |
| 906 | #endif |
| 907 | |
| 908 | len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; |
| 909 | if (len < 8) { |
| 910 | error = EMSGSIZE; |
| 911 | in6_ifstat_inc(ifp, ifs6_out_fragfail); |
| 912 | goto bad; |
| 913 | } |
| 914 | |
| 915 | mnext = &m->m_nextpkt; |
| 916 | |
| 917 | /* |
| 918 | * Change the next header field of the last header in the |
| 919 | * unfragmentable part. |
| 920 | */ |
| 921 | if (exthdrs.ip6e_rthdr) { |
| 922 | nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); |
| 923 | *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; |
| 924 | } else if (exthdrs.ip6e_dest1) { |
| 925 | nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); |
| 926 | *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; |
| 927 | } else if (exthdrs.ip6e_hbh) { |
| 928 | nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); |
| 929 | *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; |
| 930 | } else { |
| 931 | nextproto = ip6->ip6_nxt; |
| 932 | ip6->ip6_nxt = IPPROTO_FRAGMENT; |
| 933 | } |
| 934 | |
| 935 | if ((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) |
| 936 | != 0) { |
| 937 | if (IN6_NEED_CHECKSUM(ifp, |
| 938 | m->m_pkthdr.csum_flags & |
| 939 | (M_CSUM_UDPv6|M_CSUM_TCPv6))) { |
| 940 | in6_delayed_cksum(m); |
| 941 | } |
| 942 | m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); |
| 943 | } |
| 944 | |
| 945 | /* |
| 946 | * Loop through length of segment after first fragment, |
| 947 | * make new header and copy data of each part and link onto |
| 948 | * chain. |
| 949 | */ |
| 950 | m0 = m; |
| 951 | for (off = hlen; off < tlen; off += len) { |
| 952 | struct mbuf *mlast; |
| 953 | |
| 954 | MGETHDR(m, M_DONTWAIT, MT_HEADER); |
| 955 | if (!m) { |
| 956 | error = ENOBUFS; |
| 957 | IP6_STATINC(IP6_STAT_ODROPPED); |
| 958 | goto sendorfree; |
| 959 | } |
| 960 | m_reset_rcvif(m); |
| 961 | m->m_flags = m0->m_flags & M_COPYFLAGS; |
| 962 | *mnext = m; |
| 963 | mnext = &m->m_nextpkt; |
| 964 | m->m_data += max_linkhdr; |
| 965 | mhip6 = mtod(m, struct ip6_hdr *); |
| 966 | *mhip6 = *ip6; |
| 967 | m->m_len = sizeof(*mhip6); |
| 968 | /* |
| 969 | * ip6f must be valid if error is 0. But how |
| 970 | * can a compiler be expected to infer this? |
| 971 | */ |
| 972 | ip6f = NULL; |
| 973 | error = ip6_insertfraghdr(m0, m, hlen, &ip6f); |
| 974 | if (error) { |
| 975 | IP6_STATINC(IP6_STAT_ODROPPED); |
| 976 | goto sendorfree; |
| 977 | } |
| 978 | ip6f->ip6f_offlg = htons((u_int16_t)((off - hlen) & ~7)); |
| 979 | if (off + len >= tlen) |
| 980 | len = tlen - off; |
| 981 | else |
| 982 | ip6f->ip6f_offlg |= IP6F_MORE_FRAG; |
| 983 | mhip6->ip6_plen = htons((u_int16_t)(len + hlen + |
| 984 | sizeof(*ip6f) - sizeof(struct ip6_hdr))); |
| 985 | if ((m_frgpart = m_copy(m0, off, len)) == 0) { |
| 986 | error = ENOBUFS; |
| 987 | IP6_STATINC(IP6_STAT_ODROPPED); |
| 988 | goto sendorfree; |
| 989 | } |
| 990 | for (mlast = m; mlast->m_next; mlast = mlast->m_next) |
| 991 | ; |
| 992 | mlast->m_next = m_frgpart; |
| 993 | m->m_pkthdr.len = len + hlen + sizeof(*ip6f); |
| 994 | m_reset_rcvif(m); |
| 995 | ip6f->ip6f_reserved = 0; |
| 996 | ip6f->ip6f_ident = id; |
| 997 | ip6f->ip6f_nxt = nextproto; |
| 998 | IP6_STATINC(IP6_STAT_OFRAGMENTS); |
| 999 | in6_ifstat_inc(ifp, ifs6_out_fragcreat); |
| 1000 | } |
| 1001 | |
| 1002 | in6_ifstat_inc(ifp, ifs6_out_fragok); |
| 1003 | } |
| 1004 | |
| 1005 | /* |
| 1006 | * Remove leading garbages. |
| 1007 | */ |
| 1008 | sendorfree: |
| 1009 | m = m0->m_nextpkt; |
| 1010 | m0->m_nextpkt = 0; |
| 1011 | m_freem(m0); |
| 1012 | for (m0 = m; m; m = m0) { |
| 1013 | m0 = m->m_nextpkt; |
| 1014 | m->m_nextpkt = 0; |
| 1015 | if (error == 0) { |
| 1016 | struct in6_ifaddr *ia6; |
| 1017 | int s; |
| 1018 | ip6 = mtod(m, struct ip6_hdr *); |
| 1019 | s = pserialize_read_enter(); |
| 1020 | ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); |
| 1021 | if (ia6) { |
| 1022 | /* |
| 1023 | * Record statistics for this interface |
| 1024 | * address. |
| 1025 | */ |
| 1026 | ia6->ia_ifa.ifa_data.ifad_outbytes += |
| 1027 | m->m_pkthdr.len; |
| 1028 | } |
| 1029 | pserialize_read_exit(s); |
| 1030 | KASSERT(dst != NULL); |
| 1031 | error = nd6_output(ifp, origifp, m, dst, rt); |
| 1032 | } else |
| 1033 | m_freem(m); |
| 1034 | } |
| 1035 | |
| 1036 | if (error == 0) |
| 1037 | IP6_STATINC(IP6_STAT_FRAGMENTED); |
| 1038 | |
| 1039 | done: |
| 1040 | if (ro == &ip6route) |
| 1041 | rtcache_free(&ip6route); |
| 1042 | |
| 1043 | #ifdef IPSEC |
| 1044 | if (sp != NULL) |
| 1045 | KEY_FREESP(&sp); |
| 1046 | #endif /* IPSEC */ |
| 1047 | |
| 1048 | if_put(ifp, &psref); |
| 1049 | if (release_psref_ia) |
| 1050 | if_put(origifp, &psref_ia); |
| 1051 | curlwp_bindx(bound); |
| 1052 | |
| 1053 | return (error); |
| 1054 | |
| 1055 | freehdrs: |
| 1056 | m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ |
| 1057 | m_freem(exthdrs.ip6e_dest1); |
| 1058 | m_freem(exthdrs.ip6e_rthdr); |
| 1059 | m_freem(exthdrs.ip6e_dest2); |
| 1060 | /* FALLTHROUGH */ |
| 1061 | bad: |
| 1062 | m_freem(m); |
| 1063 | goto done; |
| 1064 | badscope: |
| 1065 | IP6_STATINC(IP6_STAT_BADSCOPE); |
| 1066 | in6_ifstat_inc(origifp, ifs6_out_discard); |
| 1067 | if (error == 0) |
| 1068 | error = EHOSTUNREACH; /* XXX */ |
| 1069 | goto bad; |
| 1070 | } |
| 1071 | |
| 1072 | static int |
| 1073 | ip6_copyexthdr(struct mbuf **mp, void *hdr, int hlen) |
| 1074 | { |
| 1075 | struct mbuf *m; |
| 1076 | |
| 1077 | if (hlen > MCLBYTES) |
| 1078 | return (ENOBUFS); /* XXX */ |
| 1079 | |
| 1080 | MGET(m, M_DONTWAIT, MT_DATA); |
| 1081 | if (!m) |
| 1082 | return (ENOBUFS); |
| 1083 | |
| 1084 | if (hlen > MLEN) { |
| 1085 | MCLGET(m, M_DONTWAIT); |
| 1086 | if ((m->m_flags & M_EXT) == 0) { |
| 1087 | m_free(m); |
| 1088 | return (ENOBUFS); |
| 1089 | } |
| 1090 | } |
| 1091 | m->m_len = hlen; |
| 1092 | if (hdr) |
| 1093 | bcopy(hdr, mtod(m, void *), hlen); |
| 1094 | |
| 1095 | *mp = m; |
| 1096 | return (0); |
| 1097 | } |
| 1098 | |
| 1099 | /* |
| 1100 | * Process a delayed payload checksum calculation. |
| 1101 | */ |
| 1102 | void |
| 1103 | in6_delayed_cksum(struct mbuf *m) |
| 1104 | { |
| 1105 | uint16_t csum, offset; |
| 1106 | |
| 1107 | KASSERT((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0); |
| 1108 | KASSERT((~m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0); |
| 1109 | KASSERT((m->m_pkthdr.csum_flags |
| 1110 | & (M_CSUM_UDPv4|M_CSUM_TCPv4|M_CSUM_TSOv4)) == 0); |
| 1111 | |
| 1112 | offset = M_CSUM_DATA_IPv6_HL(m->m_pkthdr.csum_data); |
| 1113 | csum = in6_cksum(m, 0, offset, m->m_pkthdr.len - offset); |
| 1114 | if (csum == 0 && (m->m_pkthdr.csum_flags & M_CSUM_UDPv6) != 0) { |
| 1115 | csum = 0xffff; |
| 1116 | } |
| 1117 | |
| 1118 | offset += M_CSUM_DATA_IPv6_OFFSET(m->m_pkthdr.csum_data); |
| 1119 | if ((offset + sizeof(csum)) > m->m_len) { |
| 1120 | m_copyback(m, offset, sizeof(csum), &csum); |
| 1121 | } else { |
| 1122 | *(uint16_t *)(mtod(m, char *) + offset) = csum; |
| 1123 | } |
| 1124 | } |
| 1125 | |
| 1126 | /* |
| 1127 | * Insert jumbo payload option. |
| 1128 | */ |
| 1129 | static int |
| 1130 | ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) |
| 1131 | { |
| 1132 | struct mbuf *mopt; |
| 1133 | u_int8_t *optbuf; |
| 1134 | u_int32_t v; |
| 1135 | |
| 1136 | #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ |
| 1137 | |
| 1138 | /* |
| 1139 | * If there is no hop-by-hop options header, allocate new one. |
| 1140 | * If there is one but it doesn't have enough space to store the |
| 1141 | * jumbo payload option, allocate a cluster to store the whole options. |
| 1142 | * Otherwise, use it to store the options. |
| 1143 | */ |
| 1144 | if (exthdrs->ip6e_hbh == 0) { |
| 1145 | MGET(mopt, M_DONTWAIT, MT_DATA); |
| 1146 | if (mopt == 0) |
| 1147 | return (ENOBUFS); |
| 1148 | mopt->m_len = JUMBOOPTLEN; |
| 1149 | optbuf = mtod(mopt, u_int8_t *); |
| 1150 | optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ |
| 1151 | exthdrs->ip6e_hbh = mopt; |
| 1152 | } else { |
| 1153 | struct ip6_hbh *hbh; |
| 1154 | |
| 1155 | mopt = exthdrs->ip6e_hbh; |
| 1156 | if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { |
| 1157 | /* |
| 1158 | * XXX assumption: |
| 1159 | * - exthdrs->ip6e_hbh is not referenced from places |
| 1160 | * other than exthdrs. |
| 1161 | * - exthdrs->ip6e_hbh is not an mbuf chain. |
| 1162 | */ |
| 1163 | int oldoptlen = mopt->m_len; |
| 1164 | struct mbuf *n; |
| 1165 | |
| 1166 | /* |
| 1167 | * XXX: give up if the whole (new) hbh header does |
| 1168 | * not fit even in an mbuf cluster. |
| 1169 | */ |
| 1170 | if (oldoptlen + JUMBOOPTLEN > MCLBYTES) |
| 1171 | return (ENOBUFS); |
| 1172 | |
| 1173 | /* |
| 1174 | * As a consequence, we must always prepare a cluster |
| 1175 | * at this point. |
| 1176 | */ |
| 1177 | MGET(n, M_DONTWAIT, MT_DATA); |
| 1178 | if (n) { |
| 1179 | MCLGET(n, M_DONTWAIT); |
| 1180 | if ((n->m_flags & M_EXT) == 0) { |
| 1181 | m_freem(n); |
| 1182 | n = NULL; |
| 1183 | } |
| 1184 | } |
| 1185 | if (!n) |
| 1186 | return (ENOBUFS); |
| 1187 | n->m_len = oldoptlen + JUMBOOPTLEN; |
| 1188 | bcopy(mtod(mopt, void *), mtod(n, void *), |
| 1189 | oldoptlen); |
| 1190 | optbuf = mtod(n, u_int8_t *) + oldoptlen; |
| 1191 | m_freem(mopt); |
| 1192 | mopt = exthdrs->ip6e_hbh = n; |
| 1193 | } else { |
| 1194 | optbuf = mtod(mopt, u_int8_t *) + mopt->m_len; |
| 1195 | mopt->m_len += JUMBOOPTLEN; |
| 1196 | } |
| 1197 | optbuf[0] = IP6OPT_PADN; |
| 1198 | optbuf[1] = 0; |
| 1199 | |
| 1200 | /* |
| 1201 | * Adjust the header length according to the pad and |
| 1202 | * the jumbo payload option. |
| 1203 | */ |
| 1204 | hbh = mtod(mopt, struct ip6_hbh *); |
| 1205 | hbh->ip6h_len += (JUMBOOPTLEN >> 3); |
| 1206 | } |
| 1207 | |
| 1208 | /* fill in the option. */ |
| 1209 | optbuf[2] = IP6OPT_JUMBO; |
| 1210 | optbuf[3] = 4; |
| 1211 | v = (u_int32_t)htonl(plen + JUMBOOPTLEN); |
| 1212 | bcopy(&v, &optbuf[4], sizeof(u_int32_t)); |
| 1213 | |
| 1214 | /* finally, adjust the packet header length */ |
| 1215 | exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; |
| 1216 | |
| 1217 | return (0); |
| 1218 | #undef JUMBOOPTLEN |
| 1219 | } |
| 1220 | |
| 1221 | /* |
| 1222 | * Insert fragment header and copy unfragmentable header portions. |
| 1223 | * |
| 1224 | * *frghdrp will not be read, and it is guaranteed that either an |
| 1225 | * error is returned or that *frghdrp will point to space allocated |
| 1226 | * for the fragment header. |
| 1227 | */ |
| 1228 | static int |
| 1229 | ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, |
| 1230 | struct ip6_frag **frghdrp) |
| 1231 | { |
| 1232 | struct mbuf *n, *mlast; |
| 1233 | |
| 1234 | if (hlen > sizeof(struct ip6_hdr)) { |
| 1235 | n = m_copym(m0, sizeof(struct ip6_hdr), |
| 1236 | hlen - sizeof(struct ip6_hdr), M_DONTWAIT); |
| 1237 | if (n == 0) |
| 1238 | return (ENOBUFS); |
| 1239 | m->m_next = n; |
| 1240 | } else |
| 1241 | n = m; |
| 1242 | |
| 1243 | /* Search for the last mbuf of unfragmentable part. */ |
| 1244 | for (mlast = n; mlast->m_next; mlast = mlast->m_next) |
| 1245 | ; |
| 1246 | |
| 1247 | if ((mlast->m_flags & M_EXT) == 0 && |
| 1248 | M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { |
| 1249 | /* use the trailing space of the last mbuf for the fragment hdr */ |
| 1250 | *frghdrp = (struct ip6_frag *)(mtod(mlast, char *) + |
| 1251 | mlast->m_len); |
| 1252 | mlast->m_len += sizeof(struct ip6_frag); |
| 1253 | m->m_pkthdr.len += sizeof(struct ip6_frag); |
| 1254 | } else { |
| 1255 | /* allocate a new mbuf for the fragment header */ |
| 1256 | struct mbuf *mfrg; |
| 1257 | |
| 1258 | MGET(mfrg, M_DONTWAIT, MT_DATA); |
| 1259 | if (mfrg == 0) |
| 1260 | return (ENOBUFS); |
| 1261 | mfrg->m_len = sizeof(struct ip6_frag); |
| 1262 | *frghdrp = mtod(mfrg, struct ip6_frag *); |
| 1263 | mlast->m_next = mfrg; |
| 1264 | } |
| 1265 | |
| 1266 | return (0); |
| 1267 | } |
| 1268 | |
| 1269 | static int |
| 1270 | ip6_getpmtu(struct rtentry *rt, struct ifnet *ifp, u_long *mtup, |
| 1271 | int *alwaysfragp) |
| 1272 | { |
| 1273 | u_int32_t mtu = 0; |
| 1274 | int alwaysfrag = 0; |
| 1275 | int error = 0; |
| 1276 | |
| 1277 | if (rt != NULL) { |
| 1278 | u_int32_t ifmtu; |
| 1279 | |
| 1280 | if (ifp == NULL) |
| 1281 | ifp = rt->rt_ifp; |
| 1282 | ifmtu = IN6_LINKMTU(ifp); |
| 1283 | mtu = rt->rt_rmx.rmx_mtu; |
| 1284 | if (mtu == 0) |
| 1285 | mtu = ifmtu; |
| 1286 | else if (mtu < IPV6_MMTU) { |
| 1287 | /* |
| 1288 | * RFC2460 section 5, last paragraph: |
| 1289 | * if we record ICMPv6 too big message with |
| 1290 | * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU |
| 1291 | * or smaller, with fragment header attached. |
| 1292 | * (fragment header is needed regardless from the |
| 1293 | * packet size, for translators to identify packets) |
| 1294 | */ |
| 1295 | alwaysfrag = 1; |
| 1296 | mtu = IPV6_MMTU; |
| 1297 | } else if (mtu > ifmtu) { |
| 1298 | /* |
| 1299 | * The MTU on the route is larger than the MTU on |
| 1300 | * the interface! This shouldn't happen, unless the |
| 1301 | * MTU of the interface has been changed after the |
| 1302 | * interface was brought up. Change the MTU in the |
| 1303 | * route to match the interface MTU (as long as the |
| 1304 | * field isn't locked). |
| 1305 | */ |
| 1306 | mtu = ifmtu; |
| 1307 | if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) |
| 1308 | rt->rt_rmx.rmx_mtu = mtu; |
| 1309 | } |
| 1310 | } else if (ifp) { |
| 1311 | mtu = IN6_LINKMTU(ifp); |
| 1312 | } else |
| 1313 | error = EHOSTUNREACH; /* XXX */ |
| 1314 | |
| 1315 | *mtup = mtu; |
| 1316 | if (alwaysfragp) |
| 1317 | *alwaysfragp = alwaysfrag; |
| 1318 | return (error); |
| 1319 | } |
| 1320 | |
| 1321 | /* |
| 1322 | * IP6 socket option processing. |
| 1323 | */ |
| 1324 | int |
| 1325 | ip6_ctloutput(int op, struct socket *so, struct sockopt *sopt) |
| 1326 | { |
| 1327 | int optdatalen, uproto; |
| 1328 | void *optdata; |
| 1329 | struct in6pcb *in6p = sotoin6pcb(so); |
| 1330 | struct ip_moptions **mopts; |
| 1331 | int error, optval; |
| 1332 | int level, optname; |
| 1333 | |
| 1334 | KASSERT(sopt != NULL); |
| 1335 | |
| 1336 | level = sopt->sopt_level; |
| 1337 | optname = sopt->sopt_name; |
| 1338 | |
| 1339 | error = optval = 0; |
| 1340 | uproto = (int)so->so_proto->pr_protocol; |
| 1341 | |
| 1342 | switch (level) { |
| 1343 | case IPPROTO_IP: |
| 1344 | switch (optname) { |
| 1345 | case IP_ADD_MEMBERSHIP: |
| 1346 | case IP_DROP_MEMBERSHIP: |
| 1347 | case IP_MULTICAST_IF: |
| 1348 | case IP_MULTICAST_LOOP: |
| 1349 | case IP_MULTICAST_TTL: |
| 1350 | mopts = &in6p->in6p_v4moptions; |
| 1351 | switch (op) { |
| 1352 | case PRCO_GETOPT: |
| 1353 | return ip_getmoptions(*mopts, sopt); |
| 1354 | case PRCO_SETOPT: |
| 1355 | return ip_setmoptions(mopts, sopt); |
| 1356 | default: |
| 1357 | return EINVAL; |
| 1358 | } |
| 1359 | default: |
| 1360 | return ENOPROTOOPT; |
| 1361 | } |
| 1362 | case IPPROTO_IPV6: |
| 1363 | break; |
| 1364 | default: |
| 1365 | return ENOPROTOOPT; |
| 1366 | } |
| 1367 | switch (op) { |
| 1368 | case PRCO_SETOPT: |
| 1369 | switch (optname) { |
| 1370 | #ifdef RFC2292 |
| 1371 | case IPV6_2292PKTOPTIONS: |
| 1372 | error = ip6_pcbopts(&in6p->in6p_outputopts, so, sopt); |
| 1373 | break; |
| 1374 | #endif |
| 1375 | |
| 1376 | /* |
| 1377 | * Use of some Hop-by-Hop options or some |
| 1378 | * Destination options, might require special |
| 1379 | * privilege. That is, normal applications |
| 1380 | * (without special privilege) might be forbidden |
| 1381 | * from setting certain options in outgoing packets, |
| 1382 | * and might never see certain options in received |
| 1383 | * packets. [RFC 2292 Section 6] |
| 1384 | * KAME specific note: |
| 1385 | * KAME prevents non-privileged users from sending or |
| 1386 | * receiving ANY hbh/dst options in order to avoid |
| 1387 | * overhead of parsing options in the kernel. |
| 1388 | */ |
| 1389 | case IPV6_RECVHOPOPTS: |
| 1390 | case IPV6_RECVDSTOPTS: |
| 1391 | case IPV6_RECVRTHDRDSTOPTS: |
| 1392 | error = kauth_authorize_network(kauth_cred_get(), |
| 1393 | KAUTH_NETWORK_IPV6, KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, |
| 1394 | NULL, NULL, NULL); |
| 1395 | if (error) |
| 1396 | break; |
| 1397 | /* FALLTHROUGH */ |
| 1398 | case IPV6_UNICAST_HOPS: |
| 1399 | case IPV6_HOPLIMIT: |
| 1400 | case IPV6_FAITH: |
| 1401 | |
| 1402 | case IPV6_RECVPKTINFO: |
| 1403 | case IPV6_RECVHOPLIMIT: |
| 1404 | case IPV6_RECVRTHDR: |
| 1405 | case IPV6_RECVPATHMTU: |
| 1406 | case IPV6_RECVTCLASS: |
| 1407 | case IPV6_V6ONLY: |
| 1408 | error = sockopt_getint(sopt, &optval); |
| 1409 | if (error) |
| 1410 | break; |
| 1411 | switch (optname) { |
| 1412 | case IPV6_UNICAST_HOPS: |
| 1413 | if (optval < -1 || optval >= 256) |
| 1414 | error = EINVAL; |
| 1415 | else { |
| 1416 | /* -1 = kernel default */ |
| 1417 | in6p->in6p_hops = optval; |
| 1418 | } |
| 1419 | break; |
| 1420 | #define OPTSET(bit) \ |
| 1421 | do { \ |
| 1422 | if (optval) \ |
| 1423 | in6p->in6p_flags |= (bit); \ |
| 1424 | else \ |
| 1425 | in6p->in6p_flags &= ~(bit); \ |
| 1426 | } while (/*CONSTCOND*/ 0) |
| 1427 | |
| 1428 | #ifdef RFC2292 |
| 1429 | #define OPTSET2292(bit) \ |
| 1430 | do { \ |
| 1431 | in6p->in6p_flags |= IN6P_RFC2292; \ |
| 1432 | if (optval) \ |
| 1433 | in6p->in6p_flags |= (bit); \ |
| 1434 | else \ |
| 1435 | in6p->in6p_flags &= ~(bit); \ |
| 1436 | } while (/*CONSTCOND*/ 0) |
| 1437 | #endif |
| 1438 | |
| 1439 | #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) |
| 1440 | |
| 1441 | case IPV6_RECVPKTINFO: |
| 1442 | #ifdef RFC2292 |
| 1443 | /* cannot mix with RFC2292 */ |
| 1444 | if (OPTBIT(IN6P_RFC2292)) { |
| 1445 | error = EINVAL; |
| 1446 | break; |
| 1447 | } |
| 1448 | #endif |
| 1449 | OPTSET(IN6P_PKTINFO); |
| 1450 | break; |
| 1451 | |
| 1452 | case IPV6_HOPLIMIT: |
| 1453 | { |
| 1454 | struct ip6_pktopts **optp; |
| 1455 | |
| 1456 | #ifdef RFC2292 |
| 1457 | /* cannot mix with RFC2292 */ |
| 1458 | if (OPTBIT(IN6P_RFC2292)) { |
| 1459 | error = EINVAL; |
| 1460 | break; |
| 1461 | } |
| 1462 | #endif |
| 1463 | optp = &in6p->in6p_outputopts; |
| 1464 | error = ip6_pcbopt(IPV6_HOPLIMIT, |
| 1465 | (u_char *)&optval, |
| 1466 | sizeof(optval), |
| 1467 | optp, |
| 1468 | kauth_cred_get(), uproto); |
| 1469 | break; |
| 1470 | } |
| 1471 | |
| 1472 | case IPV6_RECVHOPLIMIT: |
| 1473 | #ifdef RFC2292 |
| 1474 | /* cannot mix with RFC2292 */ |
| 1475 | if (OPTBIT(IN6P_RFC2292)) { |
| 1476 | error = EINVAL; |
| 1477 | break; |
| 1478 | } |
| 1479 | #endif |
| 1480 | OPTSET(IN6P_HOPLIMIT); |
| 1481 | break; |
| 1482 | |
| 1483 | case IPV6_RECVHOPOPTS: |
| 1484 | #ifdef RFC2292 |
| 1485 | /* cannot mix with RFC2292 */ |
| 1486 | if (OPTBIT(IN6P_RFC2292)) { |
| 1487 | error = EINVAL; |
| 1488 | break; |
| 1489 | } |
| 1490 | #endif |
| 1491 | OPTSET(IN6P_HOPOPTS); |
| 1492 | break; |
| 1493 | |
| 1494 | case IPV6_RECVDSTOPTS: |
| 1495 | #ifdef RFC2292 |
| 1496 | /* cannot mix with RFC2292 */ |
| 1497 | if (OPTBIT(IN6P_RFC2292)) { |
| 1498 | error = EINVAL; |
| 1499 | break; |
| 1500 | } |
| 1501 | #endif |
| 1502 | OPTSET(IN6P_DSTOPTS); |
| 1503 | break; |
| 1504 | |
| 1505 | case IPV6_RECVRTHDRDSTOPTS: |
| 1506 | #ifdef RFC2292 |
| 1507 | /* cannot mix with RFC2292 */ |
| 1508 | if (OPTBIT(IN6P_RFC2292)) { |
| 1509 | error = EINVAL; |
| 1510 | break; |
| 1511 | } |
| 1512 | #endif |
| 1513 | OPTSET(IN6P_RTHDRDSTOPTS); |
| 1514 | break; |
| 1515 | |
| 1516 | case IPV6_RECVRTHDR: |
| 1517 | #ifdef RFC2292 |
| 1518 | /* cannot mix with RFC2292 */ |
| 1519 | if (OPTBIT(IN6P_RFC2292)) { |
| 1520 | error = EINVAL; |
| 1521 | break; |
| 1522 | } |
| 1523 | #endif |
| 1524 | OPTSET(IN6P_RTHDR); |
| 1525 | break; |
| 1526 | |
| 1527 | case IPV6_FAITH: |
| 1528 | OPTSET(IN6P_FAITH); |
| 1529 | break; |
| 1530 | |
| 1531 | case IPV6_RECVPATHMTU: |
| 1532 | /* |
| 1533 | * We ignore this option for TCP |
| 1534 | * sockets. |
| 1535 | * (RFC3542 leaves this case |
| 1536 | * unspecified.) |
| 1537 | */ |
| 1538 | if (uproto != IPPROTO_TCP) |
| 1539 | OPTSET(IN6P_MTU); |
| 1540 | break; |
| 1541 | |
| 1542 | case IPV6_V6ONLY: |
| 1543 | /* |
| 1544 | * make setsockopt(IPV6_V6ONLY) |
| 1545 | * available only prior to bind(2). |
| 1546 | * see ipng mailing list, Jun 22 2001. |
| 1547 | */ |
| 1548 | if (in6p->in6p_lport || |
| 1549 | !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { |
| 1550 | error = EINVAL; |
| 1551 | break; |
| 1552 | } |
| 1553 | #ifdef INET6_BINDV6ONLY |
| 1554 | if (!optval) |
| 1555 | error = EINVAL; |
| 1556 | #else |
| 1557 | OPTSET(IN6P_IPV6_V6ONLY); |
| 1558 | #endif |
| 1559 | break; |
| 1560 | case IPV6_RECVTCLASS: |
| 1561 | #ifdef RFC2292 |
| 1562 | /* cannot mix with RFC2292 XXX */ |
| 1563 | if (OPTBIT(IN6P_RFC2292)) { |
| 1564 | error = EINVAL; |
| 1565 | break; |
| 1566 | } |
| 1567 | #endif |
| 1568 | OPTSET(IN6P_TCLASS); |
| 1569 | break; |
| 1570 | |
| 1571 | } |
| 1572 | break; |
| 1573 | |
| 1574 | case IPV6_OTCLASS: |
| 1575 | { |
| 1576 | struct ip6_pktopts **optp; |
| 1577 | u_int8_t tclass; |
| 1578 | |
| 1579 | error = sockopt_get(sopt, &tclass, sizeof(tclass)); |
| 1580 | if (error) |
| 1581 | break; |
| 1582 | optp = &in6p->in6p_outputopts; |
| 1583 | error = ip6_pcbopt(optname, |
| 1584 | (u_char *)&tclass, |
| 1585 | sizeof(tclass), |
| 1586 | optp, |
| 1587 | kauth_cred_get(), uproto); |
| 1588 | break; |
| 1589 | } |
| 1590 | |
| 1591 | case IPV6_TCLASS: |
| 1592 | case IPV6_DONTFRAG: |
| 1593 | case IPV6_USE_MIN_MTU: |
| 1594 | case IPV6_PREFER_TEMPADDR: |
| 1595 | error = sockopt_getint(sopt, &optval); |
| 1596 | if (error) |
| 1597 | break; |
| 1598 | { |
| 1599 | struct ip6_pktopts **optp; |
| 1600 | optp = &in6p->in6p_outputopts; |
| 1601 | error = ip6_pcbopt(optname, |
| 1602 | (u_char *)&optval, |
| 1603 | sizeof(optval), |
| 1604 | optp, |
| 1605 | kauth_cred_get(), uproto); |
| 1606 | break; |
| 1607 | } |
| 1608 | |
| 1609 | #ifdef RFC2292 |
| 1610 | case IPV6_2292PKTINFO: |
| 1611 | case IPV6_2292HOPLIMIT: |
| 1612 | case IPV6_2292HOPOPTS: |
| 1613 | case IPV6_2292DSTOPTS: |
| 1614 | case IPV6_2292RTHDR: |
| 1615 | /* RFC 2292 */ |
| 1616 | error = sockopt_getint(sopt, &optval); |
| 1617 | if (error) |
| 1618 | break; |
| 1619 | |
| 1620 | switch (optname) { |
| 1621 | case IPV6_2292PKTINFO: |
| 1622 | OPTSET2292(IN6P_PKTINFO); |
| 1623 | break; |
| 1624 | case IPV6_2292HOPLIMIT: |
| 1625 | OPTSET2292(IN6P_HOPLIMIT); |
| 1626 | break; |
| 1627 | case IPV6_2292HOPOPTS: |
| 1628 | /* |
| 1629 | * Check super-user privilege. |
| 1630 | * See comments for IPV6_RECVHOPOPTS. |
| 1631 | */ |
| 1632 | error = |
| 1633 | kauth_authorize_network(kauth_cred_get(), |
| 1634 | KAUTH_NETWORK_IPV6, |
| 1635 | KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, |
| 1636 | NULL, NULL); |
| 1637 | if (error) |
| 1638 | return (error); |
| 1639 | OPTSET2292(IN6P_HOPOPTS); |
| 1640 | break; |
| 1641 | case IPV6_2292DSTOPTS: |
| 1642 | error = |
| 1643 | kauth_authorize_network(kauth_cred_get(), |
| 1644 | KAUTH_NETWORK_IPV6, |
| 1645 | KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, |
| 1646 | NULL, NULL); |
| 1647 | if (error) |
| 1648 | return (error); |
| 1649 | OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ |
| 1650 | break; |
| 1651 | case IPV6_2292RTHDR: |
| 1652 | OPTSET2292(IN6P_RTHDR); |
| 1653 | break; |
| 1654 | } |
| 1655 | break; |
| 1656 | #endif |
| 1657 | case IPV6_PKTINFO: |
| 1658 | case IPV6_HOPOPTS: |
| 1659 | case IPV6_RTHDR: |
| 1660 | case IPV6_DSTOPTS: |
| 1661 | case IPV6_RTHDRDSTOPTS: |
| 1662 | case IPV6_NEXTHOP: { |
| 1663 | /* new advanced API (RFC3542) */ |
| 1664 | void *optbuf; |
| 1665 | int optbuflen; |
| 1666 | struct ip6_pktopts **optp; |
| 1667 | |
| 1668 | #ifdef RFC2292 |
| 1669 | /* cannot mix with RFC2292 */ |
| 1670 | if (OPTBIT(IN6P_RFC2292)) { |
| 1671 | error = EINVAL; |
| 1672 | break; |
| 1673 | } |
| 1674 | #endif |
| 1675 | |
| 1676 | optbuflen = sopt->sopt_size; |
| 1677 | optbuf = malloc(optbuflen, M_IP6OPT, M_NOWAIT); |
| 1678 | if (optbuf == NULL) { |
| 1679 | error = ENOBUFS; |
| 1680 | break; |
| 1681 | } |
| 1682 | |
| 1683 | error = sockopt_get(sopt, optbuf, optbuflen); |
| 1684 | if (error) { |
| 1685 | free(optbuf, M_IP6OPT); |
| 1686 | break; |
| 1687 | } |
| 1688 | optp = &in6p->in6p_outputopts; |
| 1689 | error = ip6_pcbopt(optname, optbuf, optbuflen, |
| 1690 | optp, kauth_cred_get(), uproto); |
| 1691 | |
| 1692 | free(optbuf, M_IP6OPT); |
| 1693 | break; |
| 1694 | } |
| 1695 | #undef OPTSET |
| 1696 | |
| 1697 | case IPV6_MULTICAST_IF: |
| 1698 | case IPV6_MULTICAST_HOPS: |
| 1699 | case IPV6_MULTICAST_LOOP: |
| 1700 | case IPV6_JOIN_GROUP: |
| 1701 | case IPV6_LEAVE_GROUP: |
| 1702 | error = ip6_setmoptions(sopt, in6p); |
| 1703 | break; |
| 1704 | |
| 1705 | case IPV6_PORTRANGE: |
| 1706 | error = sockopt_getint(sopt, &optval); |
| 1707 | if (error) |
| 1708 | break; |
| 1709 | |
| 1710 | switch (optval) { |
| 1711 | case IPV6_PORTRANGE_DEFAULT: |
| 1712 | in6p->in6p_flags &= ~(IN6P_LOWPORT); |
| 1713 | in6p->in6p_flags &= ~(IN6P_HIGHPORT); |
| 1714 | break; |
| 1715 | |
| 1716 | case IPV6_PORTRANGE_HIGH: |
| 1717 | in6p->in6p_flags &= ~(IN6P_LOWPORT); |
| 1718 | in6p->in6p_flags |= IN6P_HIGHPORT; |
| 1719 | break; |
| 1720 | |
| 1721 | case IPV6_PORTRANGE_LOW: |
| 1722 | in6p->in6p_flags &= ~(IN6P_HIGHPORT); |
| 1723 | in6p->in6p_flags |= IN6P_LOWPORT; |
| 1724 | break; |
| 1725 | |
| 1726 | default: |
| 1727 | error = EINVAL; |
| 1728 | break; |
| 1729 | } |
| 1730 | break; |
| 1731 | |
| 1732 | case IPV6_PORTALGO: |
| 1733 | error = sockopt_getint(sopt, &optval); |
| 1734 | if (error) |
| 1735 | break; |
| 1736 | |
| 1737 | error = portalgo_algo_index_select( |
| 1738 | (struct inpcb_hdr *)in6p, optval); |
| 1739 | break; |
| 1740 | |
| 1741 | #if defined(IPSEC) |
| 1742 | case IPV6_IPSEC_POLICY: |
| 1743 | if (ipsec_enabled) { |
| 1744 | error = ipsec6_set_policy(in6p, optname, |
| 1745 | sopt->sopt_data, sopt->sopt_size, |
| 1746 | kauth_cred_get()); |
| 1747 | break; |
| 1748 | } |
| 1749 | /*FALLTHROUGH*/ |
| 1750 | #endif /* IPSEC */ |
| 1751 | |
| 1752 | default: |
| 1753 | error = ENOPROTOOPT; |
| 1754 | break; |
| 1755 | } |
| 1756 | break; |
| 1757 | |
| 1758 | case PRCO_GETOPT: |
| 1759 | switch (optname) { |
| 1760 | #ifdef RFC2292 |
| 1761 | case IPV6_2292PKTOPTIONS: |
| 1762 | /* |
| 1763 | * RFC3542 (effectively) deprecated the |
| 1764 | * semantics of the 2292-style pktoptions. |
| 1765 | * Since it was not reliable in nature (i.e., |
| 1766 | * applications had to expect the lack of some |
| 1767 | * information after all), it would make sense |
| 1768 | * to simplify this part by always returning |
| 1769 | * empty data. |
| 1770 | */ |
| 1771 | break; |
| 1772 | #endif |
| 1773 | |
| 1774 | case IPV6_RECVHOPOPTS: |
| 1775 | case IPV6_RECVDSTOPTS: |
| 1776 | case IPV6_RECVRTHDRDSTOPTS: |
| 1777 | case IPV6_UNICAST_HOPS: |
| 1778 | case IPV6_RECVPKTINFO: |
| 1779 | case IPV6_RECVHOPLIMIT: |
| 1780 | case IPV6_RECVRTHDR: |
| 1781 | case IPV6_RECVPATHMTU: |
| 1782 | |
| 1783 | case IPV6_FAITH: |
| 1784 | case IPV6_V6ONLY: |
| 1785 | case IPV6_PORTRANGE: |
| 1786 | case IPV6_RECVTCLASS: |
| 1787 | switch (optname) { |
| 1788 | |
| 1789 | case IPV6_RECVHOPOPTS: |
| 1790 | optval = OPTBIT(IN6P_HOPOPTS); |
| 1791 | break; |
| 1792 | |
| 1793 | case IPV6_RECVDSTOPTS: |
| 1794 | optval = OPTBIT(IN6P_DSTOPTS); |
| 1795 | break; |
| 1796 | |
| 1797 | case IPV6_RECVRTHDRDSTOPTS: |
| 1798 | optval = OPTBIT(IN6P_RTHDRDSTOPTS); |
| 1799 | break; |
| 1800 | |
| 1801 | case IPV6_UNICAST_HOPS: |
| 1802 | optval = in6p->in6p_hops; |
| 1803 | break; |
| 1804 | |
| 1805 | case IPV6_RECVPKTINFO: |
| 1806 | optval = OPTBIT(IN6P_PKTINFO); |
| 1807 | break; |
| 1808 | |
| 1809 | case IPV6_RECVHOPLIMIT: |
| 1810 | optval = OPTBIT(IN6P_HOPLIMIT); |
| 1811 | break; |
| 1812 | |
| 1813 | case IPV6_RECVRTHDR: |
| 1814 | optval = OPTBIT(IN6P_RTHDR); |
| 1815 | break; |
| 1816 | |
| 1817 | case IPV6_RECVPATHMTU: |
| 1818 | optval = OPTBIT(IN6P_MTU); |
| 1819 | break; |
| 1820 | |
| 1821 | case IPV6_FAITH: |
| 1822 | optval = OPTBIT(IN6P_FAITH); |
| 1823 | break; |
| 1824 | |
| 1825 | case IPV6_V6ONLY: |
| 1826 | optval = OPTBIT(IN6P_IPV6_V6ONLY); |
| 1827 | break; |
| 1828 | |
| 1829 | case IPV6_PORTRANGE: |
| 1830 | { |
| 1831 | int flags; |
| 1832 | flags = in6p->in6p_flags; |
| 1833 | if (flags & IN6P_HIGHPORT) |
| 1834 | optval = IPV6_PORTRANGE_HIGH; |
| 1835 | else if (flags & IN6P_LOWPORT) |
| 1836 | optval = IPV6_PORTRANGE_LOW; |
| 1837 | else |
| 1838 | optval = 0; |
| 1839 | break; |
| 1840 | } |
| 1841 | case IPV6_RECVTCLASS: |
| 1842 | optval = OPTBIT(IN6P_TCLASS); |
| 1843 | break; |
| 1844 | |
| 1845 | } |
| 1846 | if (error) |
| 1847 | break; |
| 1848 | error = sockopt_setint(sopt, optval); |
| 1849 | break; |
| 1850 | |
| 1851 | case IPV6_PATHMTU: |
| 1852 | { |
| 1853 | u_long pmtu = 0; |
| 1854 | struct ip6_mtuinfo mtuinfo; |
| 1855 | struct route *ro = &in6p->in6p_route; |
| 1856 | struct rtentry *rt; |
| 1857 | union { |
| 1858 | struct sockaddr dst; |
| 1859 | struct sockaddr_in6 dst6; |
| 1860 | } u; |
| 1861 | |
| 1862 | if (!(so->so_state & SS_ISCONNECTED)) |
| 1863 | return (ENOTCONN); |
| 1864 | /* |
| 1865 | * XXX: we dot not consider the case of source |
| 1866 | * routing, or optional information to specify |
| 1867 | * the outgoing interface. |
| 1868 | */ |
| 1869 | sockaddr_in6_init(&u.dst6, &in6p->in6p_faddr, 0, 0, 0); |
| 1870 | rt = rtcache_lookup(ro, &u.dst); |
| 1871 | error = ip6_getpmtu(rt, NULL, &pmtu, NULL); |
| 1872 | if (error) |
| 1873 | break; |
| 1874 | if (pmtu > IPV6_MAXPACKET) |
| 1875 | pmtu = IPV6_MAXPACKET; |
| 1876 | |
| 1877 | memset(&mtuinfo, 0, sizeof(mtuinfo)); |
| 1878 | mtuinfo.ip6m_mtu = (u_int32_t)pmtu; |
| 1879 | optdata = (void *)&mtuinfo; |
| 1880 | optdatalen = sizeof(mtuinfo); |
| 1881 | if (optdatalen > MCLBYTES) |
| 1882 | return (EMSGSIZE); /* XXX */ |
| 1883 | error = sockopt_set(sopt, optdata, optdatalen); |
| 1884 | break; |
| 1885 | } |
| 1886 | |
| 1887 | #ifdef RFC2292 |
| 1888 | case IPV6_2292PKTINFO: |
| 1889 | case IPV6_2292HOPLIMIT: |
| 1890 | case IPV6_2292HOPOPTS: |
| 1891 | case IPV6_2292RTHDR: |
| 1892 | case IPV6_2292DSTOPTS: |
| 1893 | switch (optname) { |
| 1894 | case IPV6_2292PKTINFO: |
| 1895 | optval = OPTBIT(IN6P_PKTINFO); |
| 1896 | break; |
| 1897 | case IPV6_2292HOPLIMIT: |
| 1898 | optval = OPTBIT(IN6P_HOPLIMIT); |
| 1899 | break; |
| 1900 | case IPV6_2292HOPOPTS: |
| 1901 | optval = OPTBIT(IN6P_HOPOPTS); |
| 1902 | break; |
| 1903 | case IPV6_2292RTHDR: |
| 1904 | optval = OPTBIT(IN6P_RTHDR); |
| 1905 | break; |
| 1906 | case IPV6_2292DSTOPTS: |
| 1907 | optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); |
| 1908 | break; |
| 1909 | } |
| 1910 | error = sockopt_setint(sopt, optval); |
| 1911 | break; |
| 1912 | #endif |
| 1913 | case IPV6_PKTINFO: |
| 1914 | case IPV6_HOPOPTS: |
| 1915 | case IPV6_RTHDR: |
| 1916 | case IPV6_DSTOPTS: |
| 1917 | case IPV6_RTHDRDSTOPTS: |
| 1918 | case IPV6_NEXTHOP: |
| 1919 | case IPV6_OTCLASS: |
| 1920 | case IPV6_TCLASS: |
| 1921 | case IPV6_DONTFRAG: |
| 1922 | case IPV6_USE_MIN_MTU: |
| 1923 | case IPV6_PREFER_TEMPADDR: |
| 1924 | error = ip6_getpcbopt(in6p->in6p_outputopts, |
| 1925 | optname, sopt); |
| 1926 | break; |
| 1927 | |
| 1928 | case IPV6_MULTICAST_IF: |
| 1929 | case IPV6_MULTICAST_HOPS: |
| 1930 | case IPV6_MULTICAST_LOOP: |
| 1931 | case IPV6_JOIN_GROUP: |
| 1932 | case IPV6_LEAVE_GROUP: |
| 1933 | error = ip6_getmoptions(sopt, in6p); |
| 1934 | break; |
| 1935 | |
| 1936 | case IPV6_PORTALGO: |
| 1937 | optval = ((struct inpcb_hdr *)in6p)->inph_portalgo; |
| 1938 | error = sockopt_setint(sopt, optval); |
| 1939 | break; |
| 1940 | |
| 1941 | #if defined(IPSEC) |
| 1942 | case IPV6_IPSEC_POLICY: |
| 1943 | if (ipsec_used) { |
| 1944 | struct mbuf *m = NULL; |
| 1945 | |
| 1946 | /* |
| 1947 | * XXX: this will return EINVAL as sopt is |
| 1948 | * empty |
| 1949 | */ |
| 1950 | error = ipsec6_get_policy(in6p, sopt->sopt_data, |
| 1951 | sopt->sopt_size, &m); |
| 1952 | if (!error) |
| 1953 | error = sockopt_setmbuf(sopt, m); |
| 1954 | break; |
| 1955 | } |
| 1956 | /*FALLTHROUGH*/ |
| 1957 | #endif /* IPSEC */ |
| 1958 | |
| 1959 | default: |
| 1960 | error = ENOPROTOOPT; |
| 1961 | break; |
| 1962 | } |
| 1963 | break; |
| 1964 | } |
| 1965 | return (error); |
| 1966 | } |
| 1967 | |
| 1968 | int |
| 1969 | ip6_raw_ctloutput(int op, struct socket *so, struct sockopt *sopt) |
| 1970 | { |
| 1971 | int error = 0, optval; |
| 1972 | const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); |
| 1973 | struct in6pcb *in6p = sotoin6pcb(so); |
| 1974 | int level, optname; |
| 1975 | |
| 1976 | KASSERT(sopt != NULL); |
| 1977 | |
| 1978 | level = sopt->sopt_level; |
| 1979 | optname = sopt->sopt_name; |
| 1980 | |
| 1981 | if (level != IPPROTO_IPV6) { |
| 1982 | return ENOPROTOOPT; |
| 1983 | } |
| 1984 | |
| 1985 | switch (optname) { |
| 1986 | case IPV6_CHECKSUM: |
| 1987 | /* |
| 1988 | * For ICMPv6 sockets, no modification allowed for checksum |
| 1989 | * offset, permit "no change" values to help existing apps. |
| 1990 | * |
| 1991 | * XXX RFC3542 says: "An attempt to set IPV6_CHECKSUM |
| 1992 | * for an ICMPv6 socket will fail." The current |
| 1993 | * behavior does not meet RFC3542. |
| 1994 | */ |
| 1995 | switch (op) { |
| 1996 | case PRCO_SETOPT: |
| 1997 | error = sockopt_getint(sopt, &optval); |
| 1998 | if (error) |
| 1999 | break; |
| 2000 | if ((optval % 2) != 0) { |
| 2001 | /* the API assumes even offset values */ |
| 2002 | error = EINVAL; |
| 2003 | } else if (so->so_proto->pr_protocol == |
| 2004 | IPPROTO_ICMPV6) { |
| 2005 | if (optval != icmp6off) |
| 2006 | error = EINVAL; |
| 2007 | } else |
| 2008 | in6p->in6p_cksum = optval; |
| 2009 | break; |
| 2010 | |
| 2011 | case PRCO_GETOPT: |
| 2012 | if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) |
| 2013 | optval = icmp6off; |
| 2014 | else |
| 2015 | optval = in6p->in6p_cksum; |
| 2016 | |
| 2017 | error = sockopt_setint(sopt, optval); |
| 2018 | break; |
| 2019 | |
| 2020 | default: |
| 2021 | error = EINVAL; |
| 2022 | break; |
| 2023 | } |
| 2024 | break; |
| 2025 | |
| 2026 | default: |
| 2027 | error = ENOPROTOOPT; |
| 2028 | break; |
| 2029 | } |
| 2030 | |
| 2031 | return (error); |
| 2032 | } |
| 2033 | |
| 2034 | #ifdef RFC2292 |
| 2035 | /* |
| 2036 | * Set up IP6 options in pcb for insertion in output packets or |
| 2037 | * specifying behavior of outgoing packets. |
| 2038 | */ |
| 2039 | static int |
| 2040 | ip6_pcbopts(struct ip6_pktopts **pktopt, struct socket *so, |
| 2041 | struct sockopt *sopt) |
| 2042 | { |
| 2043 | struct ip6_pktopts *opt = *pktopt; |
| 2044 | struct mbuf *m; |
| 2045 | int error = 0; |
| 2046 | |
| 2047 | /* turn off any old options. */ |
| 2048 | if (opt) { |
| 2049 | #ifdef DIAGNOSTIC |
| 2050 | if (opt->ip6po_pktinfo || opt->ip6po_nexthop || |
| 2051 | opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || |
| 2052 | opt->ip6po_rhinfo.ip6po_rhi_rthdr) |
| 2053 | printf("ip6_pcbopts: all specified options are cleared.\n" ); |
| 2054 | #endif |
| 2055 | ip6_clearpktopts(opt, -1); |
| 2056 | } else { |
| 2057 | opt = malloc(sizeof(*opt), M_IP6OPT, M_NOWAIT); |
| 2058 | if (opt == NULL) |
| 2059 | return (ENOBUFS); |
| 2060 | } |
| 2061 | *pktopt = NULL; |
| 2062 | |
| 2063 | if (sopt == NULL || sopt->sopt_size == 0) { |
| 2064 | /* |
| 2065 | * Only turning off any previous options, regardless of |
| 2066 | * whether the opt is just created or given. |
| 2067 | */ |
| 2068 | free(opt, M_IP6OPT); |
| 2069 | return (0); |
| 2070 | } |
| 2071 | |
| 2072 | /* set options specified by user. */ |
| 2073 | m = sockopt_getmbuf(sopt); |
| 2074 | if (m == NULL) { |
| 2075 | free(opt, M_IP6OPT); |
| 2076 | return (ENOBUFS); |
| 2077 | } |
| 2078 | |
| 2079 | error = ip6_setpktopts(m, opt, NULL, kauth_cred_get(), |
| 2080 | so->so_proto->pr_protocol); |
| 2081 | m_freem(m); |
| 2082 | if (error != 0) { |
| 2083 | ip6_clearpktopts(opt, -1); /* XXX: discard all options */ |
| 2084 | free(opt, M_IP6OPT); |
| 2085 | return (error); |
| 2086 | } |
| 2087 | *pktopt = opt; |
| 2088 | return (0); |
| 2089 | } |
| 2090 | #endif |
| 2091 | |
| 2092 | /* |
| 2093 | * initialize ip6_pktopts. beware that there are non-zero default values in |
| 2094 | * the struct. |
| 2095 | */ |
| 2096 | void |
| 2097 | ip6_initpktopts(struct ip6_pktopts *opt) |
| 2098 | { |
| 2099 | |
| 2100 | memset(opt, 0, sizeof(*opt)); |
| 2101 | opt->ip6po_hlim = -1; /* -1 means default hop limit */ |
| 2102 | opt->ip6po_tclass = -1; /* -1 means default traffic class */ |
| 2103 | opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; |
| 2104 | opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; |
| 2105 | } |
| 2106 | |
| 2107 | #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) /* XXX */ |
| 2108 | static int |
| 2109 | ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, |
| 2110 | kauth_cred_t cred, int uproto) |
| 2111 | { |
| 2112 | struct ip6_pktopts *opt; |
| 2113 | |
| 2114 | if (*pktopt == NULL) { |
| 2115 | *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, |
| 2116 | M_NOWAIT); |
| 2117 | if (*pktopt == NULL) |
| 2118 | return (ENOBUFS); |
| 2119 | |
| 2120 | ip6_initpktopts(*pktopt); |
| 2121 | } |
| 2122 | opt = *pktopt; |
| 2123 | |
| 2124 | return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); |
| 2125 | } |
| 2126 | |
| 2127 | static int |
| 2128 | ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) |
| 2129 | { |
| 2130 | void *optdata = NULL; |
| 2131 | int optdatalen = 0; |
| 2132 | struct ip6_ext *ip6e; |
| 2133 | int error = 0; |
| 2134 | struct in6_pktinfo null_pktinfo; |
| 2135 | int deftclass = 0, on; |
| 2136 | int defminmtu = IP6PO_MINMTU_MCASTONLY; |
| 2137 | int defpreftemp = IP6PO_TEMPADDR_SYSTEM; |
| 2138 | |
| 2139 | switch (optname) { |
| 2140 | case IPV6_PKTINFO: |
| 2141 | if (pktopt && pktopt->ip6po_pktinfo) |
| 2142 | optdata = (void *)pktopt->ip6po_pktinfo; |
| 2143 | else { |
| 2144 | /* XXX: we don't have to do this every time... */ |
| 2145 | memset(&null_pktinfo, 0, sizeof(null_pktinfo)); |
| 2146 | optdata = (void *)&null_pktinfo; |
| 2147 | } |
| 2148 | optdatalen = sizeof(struct in6_pktinfo); |
| 2149 | break; |
| 2150 | case IPV6_OTCLASS: |
| 2151 | /* XXX */ |
| 2152 | return (EINVAL); |
| 2153 | case IPV6_TCLASS: |
| 2154 | if (pktopt && pktopt->ip6po_tclass >= 0) |
| 2155 | optdata = (void *)&pktopt->ip6po_tclass; |
| 2156 | else |
| 2157 | optdata = (void *)&deftclass; |
| 2158 | optdatalen = sizeof(int); |
| 2159 | break; |
| 2160 | case IPV6_HOPOPTS: |
| 2161 | if (pktopt && pktopt->ip6po_hbh) { |
| 2162 | optdata = (void *)pktopt->ip6po_hbh; |
| 2163 | ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; |
| 2164 | optdatalen = (ip6e->ip6e_len + 1) << 3; |
| 2165 | } |
| 2166 | break; |
| 2167 | case IPV6_RTHDR: |
| 2168 | if (pktopt && pktopt->ip6po_rthdr) { |
| 2169 | optdata = (void *)pktopt->ip6po_rthdr; |
| 2170 | ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; |
| 2171 | optdatalen = (ip6e->ip6e_len + 1) << 3; |
| 2172 | } |
| 2173 | break; |
| 2174 | case IPV6_RTHDRDSTOPTS: |
| 2175 | if (pktopt && pktopt->ip6po_dest1) { |
| 2176 | optdata = (void *)pktopt->ip6po_dest1; |
| 2177 | ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; |
| 2178 | optdatalen = (ip6e->ip6e_len + 1) << 3; |
| 2179 | } |
| 2180 | break; |
| 2181 | case IPV6_DSTOPTS: |
| 2182 | if (pktopt && pktopt->ip6po_dest2) { |
| 2183 | optdata = (void *)pktopt->ip6po_dest2; |
| 2184 | ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; |
| 2185 | optdatalen = (ip6e->ip6e_len + 1) << 3; |
| 2186 | } |
| 2187 | break; |
| 2188 | case IPV6_NEXTHOP: |
| 2189 | if (pktopt && pktopt->ip6po_nexthop) { |
| 2190 | optdata = (void *)pktopt->ip6po_nexthop; |
| 2191 | optdatalen = pktopt->ip6po_nexthop->sa_len; |
| 2192 | } |
| 2193 | break; |
| 2194 | case IPV6_USE_MIN_MTU: |
| 2195 | if (pktopt) |
| 2196 | optdata = (void *)&pktopt->ip6po_minmtu; |
| 2197 | else |
| 2198 | optdata = (void *)&defminmtu; |
| 2199 | optdatalen = sizeof(int); |
| 2200 | break; |
| 2201 | case IPV6_DONTFRAG: |
| 2202 | if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) |
| 2203 | on = 1; |
| 2204 | else |
| 2205 | on = 0; |
| 2206 | optdata = (void *)&on; |
| 2207 | optdatalen = sizeof(on); |
| 2208 | break; |
| 2209 | case IPV6_PREFER_TEMPADDR: |
| 2210 | if (pktopt) |
| 2211 | optdata = (void *)&pktopt->ip6po_prefer_tempaddr; |
| 2212 | else |
| 2213 | optdata = (void *)&defpreftemp; |
| 2214 | optdatalen = sizeof(int); |
| 2215 | break; |
| 2216 | default: /* should not happen */ |
| 2217 | #ifdef DIAGNOSTIC |
| 2218 | panic("ip6_getpcbopt: unexpected option\n" ); |
| 2219 | #endif |
| 2220 | return (ENOPROTOOPT); |
| 2221 | } |
| 2222 | |
| 2223 | error = sockopt_set(sopt, optdata, optdatalen); |
| 2224 | |
| 2225 | return (error); |
| 2226 | } |
| 2227 | |
| 2228 | void |
| 2229 | ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) |
| 2230 | { |
| 2231 | if (optname == -1 || optname == IPV6_PKTINFO) { |
| 2232 | if (pktopt->ip6po_pktinfo) |
| 2233 | free(pktopt->ip6po_pktinfo, M_IP6OPT); |
| 2234 | pktopt->ip6po_pktinfo = NULL; |
| 2235 | } |
| 2236 | if (optname == -1 || optname == IPV6_HOPLIMIT) |
| 2237 | pktopt->ip6po_hlim = -1; |
| 2238 | if (optname == -1 || optname == IPV6_TCLASS) |
| 2239 | pktopt->ip6po_tclass = -1; |
| 2240 | if (optname == -1 || optname == IPV6_NEXTHOP) { |
| 2241 | rtcache_free(&pktopt->ip6po_nextroute); |
| 2242 | if (pktopt->ip6po_nexthop) |
| 2243 | free(pktopt->ip6po_nexthop, M_IP6OPT); |
| 2244 | pktopt->ip6po_nexthop = NULL; |
| 2245 | } |
| 2246 | if (optname == -1 || optname == IPV6_HOPOPTS) { |
| 2247 | if (pktopt->ip6po_hbh) |
| 2248 | free(pktopt->ip6po_hbh, M_IP6OPT); |
| 2249 | pktopt->ip6po_hbh = NULL; |
| 2250 | } |
| 2251 | if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { |
| 2252 | if (pktopt->ip6po_dest1) |
| 2253 | free(pktopt->ip6po_dest1, M_IP6OPT); |
| 2254 | pktopt->ip6po_dest1 = NULL; |
| 2255 | } |
| 2256 | if (optname == -1 || optname == IPV6_RTHDR) { |
| 2257 | if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) |
| 2258 | free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); |
| 2259 | pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; |
| 2260 | rtcache_free(&pktopt->ip6po_route); |
| 2261 | } |
| 2262 | if (optname == -1 || optname == IPV6_DSTOPTS) { |
| 2263 | if (pktopt->ip6po_dest2) |
| 2264 | free(pktopt->ip6po_dest2, M_IP6OPT); |
| 2265 | pktopt->ip6po_dest2 = NULL; |
| 2266 | } |
| 2267 | } |
| 2268 | |
| 2269 | #define PKTOPT_EXTHDRCPY(type) \ |
| 2270 | do { \ |
| 2271 | if (src->type) { \ |
| 2272 | int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ |
| 2273 | dst->type = malloc(hlen, M_IP6OPT, canwait); \ |
| 2274 | if (dst->type == NULL) \ |
| 2275 | goto bad; \ |
| 2276 | memcpy(dst->type, src->type, hlen); \ |
| 2277 | } \ |
| 2278 | } while (/*CONSTCOND*/ 0) |
| 2279 | |
| 2280 | static int |
| 2281 | copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) |
| 2282 | { |
| 2283 | dst->ip6po_hlim = src->ip6po_hlim; |
| 2284 | dst->ip6po_tclass = src->ip6po_tclass; |
| 2285 | dst->ip6po_flags = src->ip6po_flags; |
| 2286 | dst->ip6po_minmtu = src->ip6po_minmtu; |
| 2287 | dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; |
| 2288 | if (src->ip6po_pktinfo) { |
| 2289 | dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), |
| 2290 | M_IP6OPT, canwait); |
| 2291 | if (dst->ip6po_pktinfo == NULL) |
| 2292 | goto bad; |
| 2293 | *dst->ip6po_pktinfo = *src->ip6po_pktinfo; |
| 2294 | } |
| 2295 | if (src->ip6po_nexthop) { |
| 2296 | dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, |
| 2297 | M_IP6OPT, canwait); |
| 2298 | if (dst->ip6po_nexthop == NULL) |
| 2299 | goto bad; |
| 2300 | memcpy(dst->ip6po_nexthop, src->ip6po_nexthop, |
| 2301 | src->ip6po_nexthop->sa_len); |
| 2302 | } |
| 2303 | PKTOPT_EXTHDRCPY(ip6po_hbh); |
| 2304 | PKTOPT_EXTHDRCPY(ip6po_dest1); |
| 2305 | PKTOPT_EXTHDRCPY(ip6po_dest2); |
| 2306 | PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ |
| 2307 | return (0); |
| 2308 | |
| 2309 | bad: |
| 2310 | if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT); |
| 2311 | if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT); |
| 2312 | if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT); |
| 2313 | if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT); |
| 2314 | if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT); |
| 2315 | if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT); |
| 2316 | |
| 2317 | return (ENOBUFS); |
| 2318 | } |
| 2319 | #undef PKTOPT_EXTHDRCPY |
| 2320 | |
| 2321 | struct ip6_pktopts * |
| 2322 | ip6_copypktopts(struct ip6_pktopts *src, int canwait) |
| 2323 | { |
| 2324 | int error; |
| 2325 | struct ip6_pktopts *dst; |
| 2326 | |
| 2327 | dst = malloc(sizeof(*dst), M_IP6OPT, canwait); |
| 2328 | if (dst == NULL) |
| 2329 | return (NULL); |
| 2330 | ip6_initpktopts(dst); |
| 2331 | |
| 2332 | if ((error = copypktopts(dst, src, canwait)) != 0) { |
| 2333 | free(dst, M_IP6OPT); |
| 2334 | return (NULL); |
| 2335 | } |
| 2336 | |
| 2337 | return (dst); |
| 2338 | } |
| 2339 | |
| 2340 | void |
| 2341 | ip6_freepcbopts(struct ip6_pktopts *pktopt) |
| 2342 | { |
| 2343 | if (pktopt == NULL) |
| 2344 | return; |
| 2345 | |
| 2346 | ip6_clearpktopts(pktopt, -1); |
| 2347 | |
| 2348 | free(pktopt, M_IP6OPT); |
| 2349 | } |
| 2350 | |
| 2351 | int |
| 2352 | ip6_get_membership(const struct sockopt *sopt, struct ifnet **ifp, void *v, |
| 2353 | size_t l) |
| 2354 | { |
| 2355 | struct ipv6_mreq mreq; |
| 2356 | int error; |
| 2357 | struct in6_addr *ia = &mreq.ipv6mr_multiaddr; |
| 2358 | struct in_addr *ia4 = (void *)&ia->s6_addr32[3]; |
| 2359 | error = sockopt_get(sopt, &mreq, sizeof(mreq)); |
| 2360 | if (error != 0) |
| 2361 | return error; |
| 2362 | |
| 2363 | if (IN6_IS_ADDR_UNSPECIFIED(ia)) { |
| 2364 | /* |
| 2365 | * We use the unspecified address to specify to accept |
| 2366 | * all multicast addresses. Only super user is allowed |
| 2367 | * to do this. |
| 2368 | */ |
| 2369 | if (kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_IPV6, |
| 2370 | KAUTH_REQ_NETWORK_IPV6_JOIN_MULTICAST, NULL, NULL, NULL)) |
| 2371 | return EACCES; |
| 2372 | } else if (IN6_IS_ADDR_V4MAPPED(ia)) { |
| 2373 | // Don't bother if we are not going to use ifp. |
| 2374 | if (l == sizeof(*ia)) { |
| 2375 | memcpy(v, ia, l); |
| 2376 | return 0; |
| 2377 | } |
| 2378 | } else if (!IN6_IS_ADDR_MULTICAST(ia)) { |
| 2379 | return EINVAL; |
| 2380 | } |
| 2381 | |
| 2382 | /* |
| 2383 | * If no interface was explicitly specified, choose an |
| 2384 | * appropriate one according to the given multicast address. |
| 2385 | */ |
| 2386 | if (mreq.ipv6mr_interface == 0) { |
| 2387 | struct rtentry *rt; |
| 2388 | union { |
| 2389 | struct sockaddr dst; |
| 2390 | struct sockaddr_in dst4; |
| 2391 | struct sockaddr_in6 dst6; |
| 2392 | } u; |
| 2393 | struct route ro; |
| 2394 | |
| 2395 | /* |
| 2396 | * Look up the routing table for the |
| 2397 | * address, and choose the outgoing interface. |
| 2398 | * XXX: is it a good approach? |
| 2399 | */ |
| 2400 | memset(&ro, 0, sizeof(ro)); |
| 2401 | if (IN6_IS_ADDR_V4MAPPED(ia)) |
| 2402 | sockaddr_in_init(&u.dst4, ia4, 0); |
| 2403 | else |
| 2404 | sockaddr_in6_init(&u.dst6, ia, 0, 0, 0); |
| 2405 | error = rtcache_setdst(&ro, &u.dst); |
| 2406 | if (error != 0) |
| 2407 | return error; |
| 2408 | *ifp = (rt = rtcache_init(&ro)) != NULL ? rt->rt_ifp : NULL; |
| 2409 | rtcache_free(&ro); |
| 2410 | } else { |
| 2411 | /* |
| 2412 | * If the interface is specified, validate it. |
| 2413 | */ |
| 2414 | if ((*ifp = if_byindex(mreq.ipv6mr_interface)) == NULL) |
| 2415 | return ENXIO; /* XXX EINVAL? */ |
| 2416 | } |
| 2417 | if (sizeof(*ia) == l) |
| 2418 | memcpy(v, ia, l); |
| 2419 | else |
| 2420 | memcpy(v, ia4, l); |
| 2421 | return 0; |
| 2422 | } |
| 2423 | |
| 2424 | /* |
| 2425 | * Set the IP6 multicast options in response to user setsockopt(). |
| 2426 | */ |
| 2427 | static int |
| 2428 | ip6_setmoptions(const struct sockopt *sopt, struct in6pcb *in6p) |
| 2429 | { |
| 2430 | int error = 0; |
| 2431 | u_int loop, ifindex; |
| 2432 | struct ipv6_mreq mreq; |
| 2433 | struct in6_addr ia; |
| 2434 | struct ifnet *ifp; |
| 2435 | struct ip6_moptions *im6o = in6p->in6p_moptions; |
| 2436 | struct in6_multi_mship *imm; |
| 2437 | |
| 2438 | if (im6o == NULL) { |
| 2439 | /* |
| 2440 | * No multicast option buffer attached to the pcb; |
| 2441 | * allocate one and initialize to default values. |
| 2442 | */ |
| 2443 | im6o = malloc(sizeof(*im6o), M_IPMOPTS, M_NOWAIT); |
| 2444 | if (im6o == NULL) |
| 2445 | return (ENOBUFS); |
| 2446 | in6p->in6p_moptions = im6o; |
| 2447 | im6o->im6o_multicast_if_index = 0; |
| 2448 | im6o->im6o_multicast_hlim = ip6_defmcasthlim; |
| 2449 | im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; |
| 2450 | LIST_INIT(&im6o->im6o_memberships); |
| 2451 | } |
| 2452 | |
| 2453 | switch (sopt->sopt_name) { |
| 2454 | |
| 2455 | case IPV6_MULTICAST_IF: |
| 2456 | /* |
| 2457 | * Select the interface for outgoing multicast packets. |
| 2458 | */ |
| 2459 | error = sockopt_get(sopt, &ifindex, sizeof(ifindex)); |
| 2460 | if (error != 0) |
| 2461 | break; |
| 2462 | |
| 2463 | if (ifindex != 0) { |
| 2464 | if ((ifp = if_byindex(ifindex)) == NULL) { |
| 2465 | error = ENXIO; /* XXX EINVAL? */ |
| 2466 | break; |
| 2467 | } |
| 2468 | if ((ifp->if_flags & IFF_MULTICAST) == 0) { |
| 2469 | error = EADDRNOTAVAIL; |
| 2470 | break; |
| 2471 | } |
| 2472 | } else |
| 2473 | ifp = NULL; |
| 2474 | im6o->im6o_multicast_if_index = if_get_index(ifp); |
| 2475 | break; |
| 2476 | |
| 2477 | case IPV6_MULTICAST_HOPS: |
| 2478 | { |
| 2479 | /* |
| 2480 | * Set the IP6 hoplimit for outgoing multicast packets. |
| 2481 | */ |
| 2482 | int optval; |
| 2483 | |
| 2484 | error = sockopt_getint(sopt, &optval); |
| 2485 | if (error != 0) |
| 2486 | break; |
| 2487 | |
| 2488 | if (optval < -1 || optval >= 256) |
| 2489 | error = EINVAL; |
| 2490 | else if (optval == -1) |
| 2491 | im6o->im6o_multicast_hlim = ip6_defmcasthlim; |
| 2492 | else |
| 2493 | im6o->im6o_multicast_hlim = optval; |
| 2494 | break; |
| 2495 | } |
| 2496 | |
| 2497 | case IPV6_MULTICAST_LOOP: |
| 2498 | /* |
| 2499 | * Set the loopback flag for outgoing multicast packets. |
| 2500 | * Must be zero or one. |
| 2501 | */ |
| 2502 | error = sockopt_get(sopt, &loop, sizeof(loop)); |
| 2503 | if (error != 0) |
| 2504 | break; |
| 2505 | if (loop > 1) { |
| 2506 | error = EINVAL; |
| 2507 | break; |
| 2508 | } |
| 2509 | im6o->im6o_multicast_loop = loop; |
| 2510 | break; |
| 2511 | |
| 2512 | case IPV6_JOIN_GROUP: |
| 2513 | /* |
| 2514 | * Add a multicast group membership. |
| 2515 | * Group must be a valid IP6 multicast address. |
| 2516 | */ |
| 2517 | if ((error = ip6_get_membership(sopt, &ifp, &ia, sizeof(ia)))) |
| 2518 | return error; |
| 2519 | |
| 2520 | if (IN6_IS_ADDR_V4MAPPED(&ia)) { |
| 2521 | error = ip_setmoptions(&in6p->in6p_v4moptions, sopt); |
| 2522 | break; |
| 2523 | } |
| 2524 | /* |
| 2525 | * See if we found an interface, and confirm that it |
| 2526 | * supports multicast |
| 2527 | */ |
| 2528 | if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { |
| 2529 | error = EADDRNOTAVAIL; |
| 2530 | break; |
| 2531 | } |
| 2532 | |
| 2533 | if (in6_setscope(&ia, ifp, NULL)) { |
| 2534 | error = EADDRNOTAVAIL; /* XXX: should not happen */ |
| 2535 | break; |
| 2536 | } |
| 2537 | |
| 2538 | /* |
| 2539 | * See if the membership already exists. |
| 2540 | */ |
| 2541 | for (imm = im6o->im6o_memberships.lh_first; |
| 2542 | imm != NULL; imm = imm->i6mm_chain.le_next) |
| 2543 | if (imm->i6mm_maddr->in6m_ifp == ifp && |
| 2544 | IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, |
| 2545 | &ia)) |
| 2546 | break; |
| 2547 | if (imm != NULL) { |
| 2548 | error = EADDRINUSE; |
| 2549 | break; |
| 2550 | } |
| 2551 | /* |
| 2552 | * Everything looks good; add a new record to the multicast |
| 2553 | * address list for the given interface. |
| 2554 | */ |
| 2555 | imm = in6_joingroup(ifp, &ia, &error, 0); |
| 2556 | if (imm == NULL) |
| 2557 | break; |
| 2558 | LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); |
| 2559 | break; |
| 2560 | |
| 2561 | case IPV6_LEAVE_GROUP: |
| 2562 | /* |
| 2563 | * Drop a multicast group membership. |
| 2564 | * Group must be a valid IP6 multicast address. |
| 2565 | */ |
| 2566 | error = sockopt_get(sopt, &mreq, sizeof(mreq)); |
| 2567 | if (error != 0) |
| 2568 | break; |
| 2569 | |
| 2570 | if (IN6_IS_ADDR_V4MAPPED(&mreq.ipv6mr_multiaddr)) { |
| 2571 | error = ip_setmoptions(&in6p->in6p_v4moptions, sopt); |
| 2572 | break; |
| 2573 | } |
| 2574 | /* |
| 2575 | * If an interface address was specified, get a pointer |
| 2576 | * to its ifnet structure. |
| 2577 | */ |
| 2578 | if (mreq.ipv6mr_interface != 0) { |
| 2579 | if ((ifp = if_byindex(mreq.ipv6mr_interface)) == NULL) { |
| 2580 | error = ENXIO; /* XXX EINVAL? */ |
| 2581 | break; |
| 2582 | } |
| 2583 | } else |
| 2584 | ifp = NULL; |
| 2585 | |
| 2586 | /* Fill in the scope zone ID */ |
| 2587 | if (ifp) { |
| 2588 | if (in6_setscope(&mreq.ipv6mr_multiaddr, ifp, NULL)) { |
| 2589 | /* XXX: should not happen */ |
| 2590 | error = EADDRNOTAVAIL; |
| 2591 | break; |
| 2592 | } |
| 2593 | } else if (mreq.ipv6mr_interface != 0) { |
| 2594 | /* |
| 2595 | * XXX: This case would happens when the (positive) |
| 2596 | * index is in the valid range, but the corresponding |
| 2597 | * interface has been detached dynamically. The above |
| 2598 | * check probably avoids such case to happen here, but |
| 2599 | * we check it explicitly for safety. |
| 2600 | */ |
| 2601 | error = EADDRNOTAVAIL; |
| 2602 | break; |
| 2603 | } else { /* ipv6mr_interface == 0 */ |
| 2604 | struct sockaddr_in6 sa6_mc; |
| 2605 | |
| 2606 | /* |
| 2607 | * The API spec says as follows: |
| 2608 | * If the interface index is specified as 0, the |
| 2609 | * system may choose a multicast group membership to |
| 2610 | * drop by matching the multicast address only. |
| 2611 | * On the other hand, we cannot disambiguate the scope |
| 2612 | * zone unless an interface is provided. Thus, we |
| 2613 | * check if there's ambiguity with the default scope |
| 2614 | * zone as the last resort. |
| 2615 | */ |
| 2616 | sockaddr_in6_init(&sa6_mc, &mreq.ipv6mr_multiaddr, |
| 2617 | 0, 0, 0); |
| 2618 | error = sa6_embedscope(&sa6_mc, ip6_use_defzone); |
| 2619 | if (error != 0) |
| 2620 | break; |
| 2621 | mreq.ipv6mr_multiaddr = sa6_mc.sin6_addr; |
| 2622 | } |
| 2623 | |
| 2624 | /* |
| 2625 | * Find the membership in the membership list. |
| 2626 | */ |
| 2627 | for (imm = im6o->im6o_memberships.lh_first; |
| 2628 | imm != NULL; imm = imm->i6mm_chain.le_next) { |
| 2629 | if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && |
| 2630 | IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, |
| 2631 | &mreq.ipv6mr_multiaddr)) |
| 2632 | break; |
| 2633 | } |
| 2634 | if (imm == NULL) { |
| 2635 | /* Unable to resolve interface */ |
| 2636 | error = EADDRNOTAVAIL; |
| 2637 | break; |
| 2638 | } |
| 2639 | /* |
| 2640 | * Give up the multicast address record to which the |
| 2641 | * membership points. |
| 2642 | */ |
| 2643 | LIST_REMOVE(imm, i6mm_chain); |
| 2644 | in6_leavegroup(imm); |
| 2645 | break; |
| 2646 | |
| 2647 | default: |
| 2648 | error = EOPNOTSUPP; |
| 2649 | break; |
| 2650 | } |
| 2651 | |
| 2652 | /* |
| 2653 | * If all options have default values, no need to keep the mbuf. |
| 2654 | */ |
| 2655 | if (im6o->im6o_multicast_if_index == 0 && |
| 2656 | im6o->im6o_multicast_hlim == ip6_defmcasthlim && |
| 2657 | im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && |
| 2658 | im6o->im6o_memberships.lh_first == NULL) { |
| 2659 | free(in6p->in6p_moptions, M_IPMOPTS); |
| 2660 | in6p->in6p_moptions = NULL; |
| 2661 | } |
| 2662 | |
| 2663 | return (error); |
| 2664 | } |
| 2665 | |
| 2666 | /* |
| 2667 | * Return the IP6 multicast options in response to user getsockopt(). |
| 2668 | */ |
| 2669 | static int |
| 2670 | ip6_getmoptions(struct sockopt *sopt, struct in6pcb *in6p) |
| 2671 | { |
| 2672 | u_int optval; |
| 2673 | int error; |
| 2674 | struct ip6_moptions *im6o = in6p->in6p_moptions; |
| 2675 | |
| 2676 | switch (sopt->sopt_name) { |
| 2677 | case IPV6_MULTICAST_IF: |
| 2678 | if (im6o == NULL || im6o->im6o_multicast_if_index == 0) |
| 2679 | optval = 0; |
| 2680 | else |
| 2681 | optval = im6o->im6o_multicast_if_index; |
| 2682 | |
| 2683 | error = sockopt_set(sopt, &optval, sizeof(optval)); |
| 2684 | break; |
| 2685 | |
| 2686 | case IPV6_MULTICAST_HOPS: |
| 2687 | if (im6o == NULL) |
| 2688 | optval = ip6_defmcasthlim; |
| 2689 | else |
| 2690 | optval = im6o->im6o_multicast_hlim; |
| 2691 | |
| 2692 | error = sockopt_set(sopt, &optval, sizeof(optval)); |
| 2693 | break; |
| 2694 | |
| 2695 | case IPV6_MULTICAST_LOOP: |
| 2696 | if (im6o == NULL) |
| 2697 | optval = IPV6_DEFAULT_MULTICAST_LOOP; |
| 2698 | else |
| 2699 | optval = im6o->im6o_multicast_loop; |
| 2700 | |
| 2701 | error = sockopt_set(sopt, &optval, sizeof(optval)); |
| 2702 | break; |
| 2703 | |
| 2704 | default: |
| 2705 | error = EOPNOTSUPP; |
| 2706 | } |
| 2707 | |
| 2708 | return (error); |
| 2709 | } |
| 2710 | |
| 2711 | /* |
| 2712 | * Discard the IP6 multicast options. |
| 2713 | */ |
| 2714 | void |
| 2715 | ip6_freemoptions(struct ip6_moptions *im6o) |
| 2716 | { |
| 2717 | struct in6_multi_mship *imm; |
| 2718 | |
| 2719 | if (im6o == NULL) |
| 2720 | return; |
| 2721 | |
| 2722 | while ((imm = im6o->im6o_memberships.lh_first) != NULL) { |
| 2723 | LIST_REMOVE(imm, i6mm_chain); |
| 2724 | in6_leavegroup(imm); |
| 2725 | } |
| 2726 | free(im6o, M_IPMOPTS); |
| 2727 | } |
| 2728 | |
| 2729 | /* |
| 2730 | * Set IPv6 outgoing packet options based on advanced API. |
| 2731 | */ |
| 2732 | int |
| 2733 | ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, |
| 2734 | struct ip6_pktopts *stickyopt, kauth_cred_t cred, int uproto) |
| 2735 | { |
| 2736 | struct cmsghdr *cm = 0; |
| 2737 | |
| 2738 | if (control == NULL || opt == NULL) |
| 2739 | return (EINVAL); |
| 2740 | |
| 2741 | ip6_initpktopts(opt); |
| 2742 | if (stickyopt) { |
| 2743 | int error; |
| 2744 | |
| 2745 | /* |
| 2746 | * If stickyopt is provided, make a local copy of the options |
| 2747 | * for this particular packet, then override them by ancillary |
| 2748 | * objects. |
| 2749 | * XXX: copypktopts() does not copy the cached route to a next |
| 2750 | * hop (if any). This is not very good in terms of efficiency, |
| 2751 | * but we can allow this since this option should be rarely |
| 2752 | * used. |
| 2753 | */ |
| 2754 | if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) |
| 2755 | return (error); |
| 2756 | } |
| 2757 | |
| 2758 | /* |
| 2759 | * XXX: Currently, we assume all the optional information is stored |
| 2760 | * in a single mbuf. |
| 2761 | */ |
| 2762 | if (control->m_next) |
| 2763 | return (EINVAL); |
| 2764 | |
| 2765 | /* XXX if cm->cmsg_len is not aligned, control->m_len can become <0 */ |
| 2766 | for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), |
| 2767 | control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { |
| 2768 | int error; |
| 2769 | |
| 2770 | if (control->m_len < CMSG_LEN(0)) |
| 2771 | return (EINVAL); |
| 2772 | |
| 2773 | cm = mtod(control, struct cmsghdr *); |
| 2774 | if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) |
| 2775 | return (EINVAL); |
| 2776 | if (cm->cmsg_level != IPPROTO_IPV6) |
| 2777 | continue; |
| 2778 | |
| 2779 | error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), |
| 2780 | cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); |
| 2781 | if (error) |
| 2782 | return (error); |
| 2783 | } |
| 2784 | |
| 2785 | return (0); |
| 2786 | } |
| 2787 | |
| 2788 | /* |
| 2789 | * Set a particular packet option, as a sticky option or an ancillary data |
| 2790 | * item. "len" can be 0 only when it's a sticky option. |
| 2791 | * We have 4 cases of combination of "sticky" and "cmsg": |
| 2792 | * "sticky=0, cmsg=0": impossible |
| 2793 | * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data |
| 2794 | * "sticky=1, cmsg=0": RFC3542 socket option |
| 2795 | * "sticky=1, cmsg=1": RFC2292 socket option |
| 2796 | */ |
| 2797 | static int |
| 2798 | ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, |
| 2799 | kauth_cred_t cred, int sticky, int cmsg, int uproto) |
| 2800 | { |
| 2801 | int minmtupolicy; |
| 2802 | int error; |
| 2803 | |
| 2804 | if (!sticky && !cmsg) { |
| 2805 | #ifdef DIAGNOSTIC |
| 2806 | printf("ip6_setpktopt: impossible case\n" ); |
| 2807 | #endif |
| 2808 | return (EINVAL); |
| 2809 | } |
| 2810 | |
| 2811 | /* |
| 2812 | * IPV6_2292xxx is for backward compatibility to RFC2292, and should |
| 2813 | * not be specified in the context of RFC3542. Conversely, |
| 2814 | * RFC3542 types should not be specified in the context of RFC2292. |
| 2815 | */ |
| 2816 | if (!cmsg) { |
| 2817 | switch (optname) { |
| 2818 | case IPV6_2292PKTINFO: |
| 2819 | case IPV6_2292HOPLIMIT: |
| 2820 | case IPV6_2292NEXTHOP: |
| 2821 | case IPV6_2292HOPOPTS: |
| 2822 | case IPV6_2292DSTOPTS: |
| 2823 | case IPV6_2292RTHDR: |
| 2824 | case IPV6_2292PKTOPTIONS: |
| 2825 | return (ENOPROTOOPT); |
| 2826 | } |
| 2827 | } |
| 2828 | if (sticky && cmsg) { |
| 2829 | switch (optname) { |
| 2830 | case IPV6_PKTINFO: |
| 2831 | case IPV6_HOPLIMIT: |
| 2832 | case IPV6_NEXTHOP: |
| 2833 | case IPV6_HOPOPTS: |
| 2834 | case IPV6_DSTOPTS: |
| 2835 | case IPV6_RTHDRDSTOPTS: |
| 2836 | case IPV6_RTHDR: |
| 2837 | case IPV6_USE_MIN_MTU: |
| 2838 | case IPV6_DONTFRAG: |
| 2839 | case IPV6_OTCLASS: |
| 2840 | case IPV6_TCLASS: |
| 2841 | case IPV6_PREFER_TEMPADDR: /* XXX not an RFC3542 option */ |
| 2842 | return (ENOPROTOOPT); |
| 2843 | } |
| 2844 | } |
| 2845 | |
| 2846 | switch (optname) { |
| 2847 | #ifdef RFC2292 |
| 2848 | case IPV6_2292PKTINFO: |
| 2849 | #endif |
| 2850 | case IPV6_PKTINFO: |
| 2851 | { |
| 2852 | struct in6_pktinfo *pktinfo; |
| 2853 | |
| 2854 | if (len != sizeof(struct in6_pktinfo)) |
| 2855 | return (EINVAL); |
| 2856 | |
| 2857 | pktinfo = (struct in6_pktinfo *)buf; |
| 2858 | |
| 2859 | /* |
| 2860 | * An application can clear any sticky IPV6_PKTINFO option by |
| 2861 | * doing a "regular" setsockopt with ipi6_addr being |
| 2862 | * in6addr_any and ipi6_ifindex being zero. |
| 2863 | * [RFC 3542, Section 6] |
| 2864 | */ |
| 2865 | if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && |
| 2866 | pktinfo->ipi6_ifindex == 0 && |
| 2867 | IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { |
| 2868 | ip6_clearpktopts(opt, optname); |
| 2869 | break; |
| 2870 | } |
| 2871 | |
| 2872 | if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && |
| 2873 | sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { |
| 2874 | return (EINVAL); |
| 2875 | } |
| 2876 | |
| 2877 | /* Validate the interface index if specified. */ |
| 2878 | if (pktinfo->ipi6_ifindex) { |
| 2879 | struct ifnet *ifp; |
| 2880 | int s = pserialize_read_enter(); |
| 2881 | ifp = if_byindex(pktinfo->ipi6_ifindex); |
| 2882 | if (ifp == NULL) { |
| 2883 | pserialize_read_exit(s); |
| 2884 | return ENXIO; |
| 2885 | } |
| 2886 | pserialize_read_exit(s); |
| 2887 | } |
| 2888 | |
| 2889 | /* |
| 2890 | * We store the address anyway, and let in6_selectsrc() |
| 2891 | * validate the specified address. This is because ipi6_addr |
| 2892 | * may not have enough information about its scope zone, and |
| 2893 | * we may need additional information (such as outgoing |
| 2894 | * interface or the scope zone of a destination address) to |
| 2895 | * disambiguate the scope. |
| 2896 | * XXX: the delay of the validation may confuse the |
| 2897 | * application when it is used as a sticky option. |
| 2898 | */ |
| 2899 | if (opt->ip6po_pktinfo == NULL) { |
| 2900 | opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), |
| 2901 | M_IP6OPT, M_NOWAIT); |
| 2902 | if (opt->ip6po_pktinfo == NULL) |
| 2903 | return (ENOBUFS); |
| 2904 | } |
| 2905 | memcpy(opt->ip6po_pktinfo, pktinfo, sizeof(*pktinfo)); |
| 2906 | break; |
| 2907 | } |
| 2908 | |
| 2909 | #ifdef RFC2292 |
| 2910 | case IPV6_2292HOPLIMIT: |
| 2911 | #endif |
| 2912 | case IPV6_HOPLIMIT: |
| 2913 | { |
| 2914 | int *hlimp; |
| 2915 | |
| 2916 | /* |
| 2917 | * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT |
| 2918 | * to simplify the ordering among hoplimit options. |
| 2919 | */ |
| 2920 | if (optname == IPV6_HOPLIMIT && sticky) |
| 2921 | return (ENOPROTOOPT); |
| 2922 | |
| 2923 | if (len != sizeof(int)) |
| 2924 | return (EINVAL); |
| 2925 | hlimp = (int *)buf; |
| 2926 | if (*hlimp < -1 || *hlimp > 255) |
| 2927 | return (EINVAL); |
| 2928 | |
| 2929 | opt->ip6po_hlim = *hlimp; |
| 2930 | break; |
| 2931 | } |
| 2932 | |
| 2933 | case IPV6_OTCLASS: |
| 2934 | if (len != sizeof(u_int8_t)) |
| 2935 | return (EINVAL); |
| 2936 | |
| 2937 | opt->ip6po_tclass = *(u_int8_t *)buf; |
| 2938 | break; |
| 2939 | |
| 2940 | case IPV6_TCLASS: |
| 2941 | { |
| 2942 | int tclass; |
| 2943 | |
| 2944 | if (len != sizeof(int)) |
| 2945 | return (EINVAL); |
| 2946 | tclass = *(int *)buf; |
| 2947 | if (tclass < -1 || tclass > 255) |
| 2948 | return (EINVAL); |
| 2949 | |
| 2950 | opt->ip6po_tclass = tclass; |
| 2951 | break; |
| 2952 | } |
| 2953 | |
| 2954 | #ifdef RFC2292 |
| 2955 | case IPV6_2292NEXTHOP: |
| 2956 | #endif |
| 2957 | case IPV6_NEXTHOP: |
| 2958 | error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6, |
| 2959 | KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); |
| 2960 | if (error) |
| 2961 | return (error); |
| 2962 | |
| 2963 | if (len == 0) { /* just remove the option */ |
| 2964 | ip6_clearpktopts(opt, IPV6_NEXTHOP); |
| 2965 | break; |
| 2966 | } |
| 2967 | |
| 2968 | /* check if cmsg_len is large enough for sa_len */ |
| 2969 | if (len < sizeof(struct sockaddr) || len < *buf) |
| 2970 | return (EINVAL); |
| 2971 | |
| 2972 | switch (((struct sockaddr *)buf)->sa_family) { |
| 2973 | case AF_INET6: |
| 2974 | { |
| 2975 | struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; |
| 2976 | |
| 2977 | if (sa6->sin6_len != sizeof(struct sockaddr_in6)) |
| 2978 | return (EINVAL); |
| 2979 | |
| 2980 | if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || |
| 2981 | IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { |
| 2982 | return (EINVAL); |
| 2983 | } |
| 2984 | if ((error = sa6_embedscope(sa6, ip6_use_defzone)) |
| 2985 | != 0) { |
| 2986 | return (error); |
| 2987 | } |
| 2988 | break; |
| 2989 | } |
| 2990 | case AF_LINK: /* eventually be supported? */ |
| 2991 | default: |
| 2992 | return (EAFNOSUPPORT); |
| 2993 | } |
| 2994 | |
| 2995 | /* turn off the previous option, then set the new option. */ |
| 2996 | ip6_clearpktopts(opt, IPV6_NEXTHOP); |
| 2997 | opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); |
| 2998 | if (opt->ip6po_nexthop == NULL) |
| 2999 | return (ENOBUFS); |
| 3000 | memcpy(opt->ip6po_nexthop, buf, *buf); |
| 3001 | break; |
| 3002 | |
| 3003 | #ifdef RFC2292 |
| 3004 | case IPV6_2292HOPOPTS: |
| 3005 | #endif |
| 3006 | case IPV6_HOPOPTS: |
| 3007 | { |
| 3008 | struct ip6_hbh *hbh; |
| 3009 | int hbhlen; |
| 3010 | |
| 3011 | /* |
| 3012 | * XXX: We don't allow a non-privileged user to set ANY HbH |
| 3013 | * options, since per-option restriction has too much |
| 3014 | * overhead. |
| 3015 | */ |
| 3016 | error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6, |
| 3017 | KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); |
| 3018 | if (error) |
| 3019 | return (error); |
| 3020 | |
| 3021 | if (len == 0) { |
| 3022 | ip6_clearpktopts(opt, IPV6_HOPOPTS); |
| 3023 | break; /* just remove the option */ |
| 3024 | } |
| 3025 | |
| 3026 | /* message length validation */ |
| 3027 | if (len < sizeof(struct ip6_hbh)) |
| 3028 | return (EINVAL); |
| 3029 | hbh = (struct ip6_hbh *)buf; |
| 3030 | hbhlen = (hbh->ip6h_len + 1) << 3; |
| 3031 | if (len != hbhlen) |
| 3032 | return (EINVAL); |
| 3033 | |
| 3034 | /* turn off the previous option, then set the new option. */ |
| 3035 | ip6_clearpktopts(opt, IPV6_HOPOPTS); |
| 3036 | opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); |
| 3037 | if (opt->ip6po_hbh == NULL) |
| 3038 | return (ENOBUFS); |
| 3039 | memcpy(opt->ip6po_hbh, hbh, hbhlen); |
| 3040 | |
| 3041 | break; |
| 3042 | } |
| 3043 | |
| 3044 | #ifdef RFC2292 |
| 3045 | case IPV6_2292DSTOPTS: |
| 3046 | #endif |
| 3047 | case IPV6_DSTOPTS: |
| 3048 | case IPV6_RTHDRDSTOPTS: |
| 3049 | { |
| 3050 | struct ip6_dest *dest, **newdest = NULL; |
| 3051 | int destlen; |
| 3052 | |
| 3053 | /* XXX: see the comment for IPV6_HOPOPTS */ |
| 3054 | error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6, |
| 3055 | KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); |
| 3056 | if (error) |
| 3057 | return (error); |
| 3058 | |
| 3059 | if (len == 0) { |
| 3060 | ip6_clearpktopts(opt, optname); |
| 3061 | break; /* just remove the option */ |
| 3062 | } |
| 3063 | |
| 3064 | /* message length validation */ |
| 3065 | if (len < sizeof(struct ip6_dest)) |
| 3066 | return (EINVAL); |
| 3067 | dest = (struct ip6_dest *)buf; |
| 3068 | destlen = (dest->ip6d_len + 1) << 3; |
| 3069 | if (len != destlen) |
| 3070 | return (EINVAL); |
| 3071 | /* |
| 3072 | * Determine the position that the destination options header |
| 3073 | * should be inserted; before or after the routing header. |
| 3074 | */ |
| 3075 | switch (optname) { |
| 3076 | case IPV6_2292DSTOPTS: |
| 3077 | /* |
| 3078 | * The old advanced API is ambiguous on this point. |
| 3079 | * Our approach is to determine the position based |
| 3080 | * according to the existence of a routing header. |
| 3081 | * Note, however, that this depends on the order of the |
| 3082 | * extension headers in the ancillary data; the 1st |
| 3083 | * part of the destination options header must appear |
| 3084 | * before the routing header in the ancillary data, |
| 3085 | * too. |
| 3086 | * RFC3542 solved the ambiguity by introducing |
| 3087 | * separate ancillary data or option types. |
| 3088 | */ |
| 3089 | if (opt->ip6po_rthdr == NULL) |
| 3090 | newdest = &opt->ip6po_dest1; |
| 3091 | else |
| 3092 | newdest = &opt->ip6po_dest2; |
| 3093 | break; |
| 3094 | case IPV6_RTHDRDSTOPTS: |
| 3095 | newdest = &opt->ip6po_dest1; |
| 3096 | break; |
| 3097 | case IPV6_DSTOPTS: |
| 3098 | newdest = &opt->ip6po_dest2; |
| 3099 | break; |
| 3100 | } |
| 3101 | |
| 3102 | /* turn off the previous option, then set the new option. */ |
| 3103 | ip6_clearpktopts(opt, optname); |
| 3104 | *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); |
| 3105 | if (*newdest == NULL) |
| 3106 | return (ENOBUFS); |
| 3107 | memcpy(*newdest, dest, destlen); |
| 3108 | |
| 3109 | break; |
| 3110 | } |
| 3111 | |
| 3112 | #ifdef RFC2292 |
| 3113 | case IPV6_2292RTHDR: |
| 3114 | #endif |
| 3115 | case IPV6_RTHDR: |
| 3116 | { |
| 3117 | struct ip6_rthdr *rth; |
| 3118 | int rthlen; |
| 3119 | |
| 3120 | if (len == 0) { |
| 3121 | ip6_clearpktopts(opt, IPV6_RTHDR); |
| 3122 | break; /* just remove the option */ |
| 3123 | } |
| 3124 | |
| 3125 | /* message length validation */ |
| 3126 | if (len < sizeof(struct ip6_rthdr)) |
| 3127 | return (EINVAL); |
| 3128 | rth = (struct ip6_rthdr *)buf; |
| 3129 | rthlen = (rth->ip6r_len + 1) << 3; |
| 3130 | if (len != rthlen) |
| 3131 | return (EINVAL); |
| 3132 | switch (rth->ip6r_type) { |
| 3133 | case IPV6_RTHDR_TYPE_0: |
| 3134 | if (rth->ip6r_len == 0) /* must contain one addr */ |
| 3135 | return (EINVAL); |
| 3136 | if (rth->ip6r_len % 2) /* length must be even */ |
| 3137 | return (EINVAL); |
| 3138 | if (rth->ip6r_len / 2 != rth->ip6r_segleft) |
| 3139 | return (EINVAL); |
| 3140 | break; |
| 3141 | default: |
| 3142 | return (EINVAL); /* not supported */ |
| 3143 | } |
| 3144 | /* turn off the previous option */ |
| 3145 | ip6_clearpktopts(opt, IPV6_RTHDR); |
| 3146 | opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); |
| 3147 | if (opt->ip6po_rthdr == NULL) |
| 3148 | return (ENOBUFS); |
| 3149 | memcpy(opt->ip6po_rthdr, rth, rthlen); |
| 3150 | break; |
| 3151 | } |
| 3152 | |
| 3153 | case IPV6_USE_MIN_MTU: |
| 3154 | if (len != sizeof(int)) |
| 3155 | return (EINVAL); |
| 3156 | minmtupolicy = *(int *)buf; |
| 3157 | if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && |
| 3158 | minmtupolicy != IP6PO_MINMTU_DISABLE && |
| 3159 | minmtupolicy != IP6PO_MINMTU_ALL) { |
| 3160 | return (EINVAL); |
| 3161 | } |
| 3162 | opt->ip6po_minmtu = minmtupolicy; |
| 3163 | break; |
| 3164 | |
| 3165 | case IPV6_DONTFRAG: |
| 3166 | if (len != sizeof(int)) |
| 3167 | return (EINVAL); |
| 3168 | |
| 3169 | if (uproto == IPPROTO_TCP || *(int *)buf == 0) { |
| 3170 | /* |
| 3171 | * we ignore this option for TCP sockets. |
| 3172 | * (RFC3542 leaves this case unspecified.) |
| 3173 | */ |
| 3174 | opt->ip6po_flags &= ~IP6PO_DONTFRAG; |
| 3175 | } else |
| 3176 | opt->ip6po_flags |= IP6PO_DONTFRAG; |
| 3177 | break; |
| 3178 | |
| 3179 | case IPV6_PREFER_TEMPADDR: |
| 3180 | { |
| 3181 | int preftemp; |
| 3182 | |
| 3183 | if (len != sizeof(int)) |
| 3184 | return (EINVAL); |
| 3185 | preftemp = *(int *)buf; |
| 3186 | switch (preftemp) { |
| 3187 | case IP6PO_TEMPADDR_SYSTEM: |
| 3188 | case IP6PO_TEMPADDR_NOTPREFER: |
| 3189 | case IP6PO_TEMPADDR_PREFER: |
| 3190 | break; |
| 3191 | default: |
| 3192 | return (EINVAL); |
| 3193 | } |
| 3194 | opt->ip6po_prefer_tempaddr = preftemp; |
| 3195 | break; |
| 3196 | } |
| 3197 | |
| 3198 | default: |
| 3199 | return (ENOPROTOOPT); |
| 3200 | } /* end of switch */ |
| 3201 | |
| 3202 | return (0); |
| 3203 | } |
| 3204 | |
| 3205 | /* |
| 3206 | * Routine called from ip6_output() to loop back a copy of an IP6 multicast |
| 3207 | * packet to the input queue of a specified interface. Note that this |
| 3208 | * calls the output routine of the loopback "driver", but with an interface |
| 3209 | * pointer that might NOT be lo0ifp -- easier than replicating that code here. |
| 3210 | */ |
| 3211 | void |
| 3212 | ip6_mloopback(struct ifnet *ifp, struct mbuf *m, |
| 3213 | const struct sockaddr_in6 *dst) |
| 3214 | { |
| 3215 | struct mbuf *copym; |
| 3216 | struct ip6_hdr *ip6; |
| 3217 | |
| 3218 | copym = m_copy(m, 0, M_COPYALL); |
| 3219 | if (copym == NULL) |
| 3220 | return; |
| 3221 | |
| 3222 | /* |
| 3223 | * Make sure to deep-copy IPv6 header portion in case the data |
| 3224 | * is in an mbuf cluster, so that we can safely override the IPv6 |
| 3225 | * header portion later. |
| 3226 | */ |
| 3227 | if ((copym->m_flags & M_EXT) != 0 || |
| 3228 | copym->m_len < sizeof(struct ip6_hdr)) { |
| 3229 | copym = m_pullup(copym, sizeof(struct ip6_hdr)); |
| 3230 | if (copym == NULL) |
| 3231 | return; |
| 3232 | } |
| 3233 | |
| 3234 | #ifdef DIAGNOSTIC |
| 3235 | if (copym->m_len < sizeof(*ip6)) { |
| 3236 | m_freem(copym); |
| 3237 | return; |
| 3238 | } |
| 3239 | #endif |
| 3240 | |
| 3241 | ip6 = mtod(copym, struct ip6_hdr *); |
| 3242 | /* |
| 3243 | * clear embedded scope identifiers if necessary. |
| 3244 | * in6_clearscope will touch the addresses only when necessary. |
| 3245 | */ |
| 3246 | in6_clearscope(&ip6->ip6_src); |
| 3247 | in6_clearscope(&ip6->ip6_dst); |
| 3248 | |
| 3249 | (void)looutput(ifp, copym, (const struct sockaddr *)dst, NULL); |
| 3250 | } |
| 3251 | |
| 3252 | /* |
| 3253 | * Chop IPv6 header off from the payload. |
| 3254 | */ |
| 3255 | static int |
| 3256 | ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) |
| 3257 | { |
| 3258 | struct mbuf *mh; |
| 3259 | struct ip6_hdr *ip6; |
| 3260 | |
| 3261 | ip6 = mtod(m, struct ip6_hdr *); |
| 3262 | if (m->m_len > sizeof(*ip6)) { |
| 3263 | MGETHDR(mh, M_DONTWAIT, MT_HEADER); |
| 3264 | if (mh == 0) { |
| 3265 | m_freem(m); |
| 3266 | return ENOBUFS; |
| 3267 | } |
| 3268 | M_MOVE_PKTHDR(mh, m); |
| 3269 | MH_ALIGN(mh, sizeof(*ip6)); |
| 3270 | m->m_len -= sizeof(*ip6); |
| 3271 | m->m_data += sizeof(*ip6); |
| 3272 | mh->m_next = m; |
| 3273 | m = mh; |
| 3274 | m->m_len = sizeof(*ip6); |
| 3275 | bcopy((void *)ip6, mtod(m, void *), sizeof(*ip6)); |
| 3276 | } |
| 3277 | exthdrs->ip6e_ip6 = m; |
| 3278 | return 0; |
| 3279 | } |
| 3280 | |
| 3281 | /* |
| 3282 | * Compute IPv6 extension header length. |
| 3283 | */ |
| 3284 | int |
| 3285 | ip6_optlen(struct in6pcb *in6p) |
| 3286 | { |
| 3287 | int len; |
| 3288 | |
| 3289 | if (!in6p->in6p_outputopts) |
| 3290 | return 0; |
| 3291 | |
| 3292 | len = 0; |
| 3293 | #define elen(x) \ |
| 3294 | (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) |
| 3295 | |
| 3296 | len += elen(in6p->in6p_outputopts->ip6po_hbh); |
| 3297 | len += elen(in6p->in6p_outputopts->ip6po_dest1); |
| 3298 | len += elen(in6p->in6p_outputopts->ip6po_rthdr); |
| 3299 | len += elen(in6p->in6p_outputopts->ip6po_dest2); |
| 3300 | return len; |
| 3301 | #undef elen |
| 3302 | } |
| 3303 | |
| 3304 | /* |
| 3305 | * Ensure sending address is valid. |
| 3306 | * Returns 0 on success, -1 if an error should be sent back or 1 |
| 3307 | * if the packet could be dropped without error (protocol dependent). |
| 3308 | */ |
| 3309 | static int |
| 3310 | ip6_ifaddrvalid(const struct in6_addr *addr) |
| 3311 | { |
| 3312 | struct sockaddr_in6 sin6; |
| 3313 | int s, error; |
| 3314 | struct ifaddr *ifa; |
| 3315 | struct in6_ifaddr *ia6; |
| 3316 | |
| 3317 | if (IN6_IS_ADDR_UNSPECIFIED(addr)) |
| 3318 | return 0; |
| 3319 | |
| 3320 | memset(&sin6, 0, sizeof(sin6)); |
| 3321 | sin6.sin6_family = AF_INET6; |
| 3322 | sin6.sin6_len = sizeof(sin6); |
| 3323 | sin6.sin6_addr = *addr; |
| 3324 | |
| 3325 | s = pserialize_read_enter(); |
| 3326 | ifa = ifa_ifwithaddr(sin6tosa(&sin6)); |
| 3327 | if ((ia6 = ifatoia6(ifa)) == NULL || |
| 3328 | ia6->ia6_flags & (IN6_IFF_ANYCAST | IN6_IFF_DUPLICATED)) |
| 3329 | error = -1; |
| 3330 | else if (ia6->ia6_flags & (IN6_IFF_TENTATIVE | IN6_IFF_DETACHED)) |
| 3331 | error = 1; |
| 3332 | else |
| 3333 | error = 0; |
| 3334 | pserialize_read_exit(s); |
| 3335 | |
| 3336 | return error; |
| 3337 | } |
| 3338 | |