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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 | /** @file * @brief IPv6 related functions */ /* * Copyright (c) 2016 Intel Corporation * * SPDX-License-Identifier: Apache-2.0 */ /* By default this prints too much data, set the value to 1 to see * neighbor cache contents. */ #define NET_DEBUG_NBR 0 #include <logging/log.h> LOG_MODULE_REGISTER(net_ipv6, CONFIG_NET_IPV6_LOG_LEVEL); #include <errno.h> #include <stdlib.h> #include <net/net_core.h> #include <net/net_pkt.h> #include <net/net_stats.h> #include <net/net_context.h> #include <net/net_mgmt.h> #include "net_private.h" #include "connection.h" #include "icmpv6.h" #include "udp_internal.h" #include "tcp_internal.h" #include "ipv6.h" #include "nbr.h" #include "6lo.h" #include "route.h" #include "net_stats.h" /* Timeout value to be used when allocating net buffer during various * neighbor discovery procedures. */ #define ND_NET_BUF_TIMEOUT K_MSEC(100) /* Timeout for various buffer allocations in this file. */ #define NET_BUF_TIMEOUT K_MSEC(50) /* Maximum reachable time value specified in RFC 4861 section * 6.2.1. Router Configuration Variables, AdvReachableTime */ #define MAX_REACHABLE_TIME 3600000 /* IPv6 wildcard and loopback address defined by RFC2553 */ const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; const struct in6_addr *net_ipv6_unspecified_address(void) { return &in6addr_any; } int net_ipv6_create(struct net_pkt *pkt, const struct in6_addr *src, const struct in6_addr *dst) { NET_PKT_DATA_ACCESS_CONTIGUOUS_DEFINE(ipv6_access, struct net_ipv6_hdr); struct net_ipv6_hdr *ipv6_hdr; ipv6_hdr = (struct net_ipv6_hdr *)net_pkt_get_data(pkt, &ipv6_access); if (!ipv6_hdr) { return -ENOBUFS; } ipv6_hdr->vtc = 0x60; ipv6_hdr->tcflow = 0U; ipv6_hdr->flow = 0U; ipv6_hdr->len = 0U; ipv6_hdr->nexthdr = 0U; /* User can tweak the default hop limit if needed */ ipv6_hdr->hop_limit = net_pkt_ipv6_hop_limit(pkt); if (ipv6_hdr->hop_limit == 0U) { ipv6_hdr->hop_limit = net_if_ipv6_get_hop_limit(net_pkt_iface(pkt)); } net_ipaddr_copy(&ipv6_hdr->dst, dst); net_ipaddr_copy(&ipv6_hdr->src, src); net_pkt_set_ip_hdr_len(pkt, sizeof(struct net_ipv6_hdr)); net_pkt_set_ipv6_ext_len(pkt, 0); return net_pkt_set_data(pkt, &ipv6_access); } int net_ipv6_finalize(struct net_pkt *pkt, u8_t next_header_proto) { NET_PKT_DATA_ACCESS_CONTIGUOUS_DEFINE(ipv6_access, struct net_ipv6_hdr); struct net_ipv6_hdr *ipv6_hdr; net_pkt_set_overwrite(pkt, true); ipv6_hdr = (struct net_ipv6_hdr *)net_pkt_get_data(pkt, &ipv6_access); if (!ipv6_hdr) { return -ENOBUFS; } ipv6_hdr->len = htons(net_pkt_get_len(pkt) - sizeof(struct net_ipv6_hdr)); if (net_pkt_ipv6_next_hdr(pkt) != 255U) { ipv6_hdr->nexthdr = net_pkt_ipv6_next_hdr(pkt); } else { ipv6_hdr->nexthdr = next_header_proto; } net_pkt_set_data(pkt, &ipv6_access); if (net_pkt_ipv6_next_hdr(pkt) != 255U && net_pkt_skip(pkt, net_pkt_ipv6_ext_len(pkt))) { return -ENOBUFS; } if (IS_ENABLED(CONFIG_NET_UDP) && next_header_proto == IPPROTO_UDP) { return net_udp_finalize(pkt); } else if (IS_ENABLED(CONFIG_NET_TCP) && next_header_proto == IPPROTO_TCP) { return net_tcp_finalize(pkt); } else if (next_header_proto == IPPROTO_ICMPV6) { return net_icmpv6_finalize(pkt); } return 0; } static inline bool ipv6_drop_on_unknown_option(struct net_pkt *pkt, struct net_ipv6_hdr *hdr, u8_t opt_type, u16_t length) { /* RFC 2460 chapter 4.2 tells how to handle the unknown * options by the two highest order bits of the option: * * 00: Skip over this option and continue processing the header. * 01: Discard the packet. * 10: Discard the packet and, regardless of whether or not the * packet's Destination Address was a multicast address, * send an ICMP Parameter Problem, Code 2, message to the packet's * Source Address, pointing to the unrecognized Option Type. * 11: Discard the packet and, only if the packet's Destination * Address was not a multicast address, send an ICMP Parameter * Problem, Code 2, message to the packet's Source Address, * pointing to the unrecognized Option Type. */ NET_DBG("Unknown option %d (0x%02x) MSB %d - 0x%02x", opt_type, opt_type, opt_type >> 6, opt_type & 0xc0); switch (opt_type & 0xc0) { case 0x00: return false; case 0x40: break; case 0xc0: if (net_ipv6_is_addr_mcast(&hdr->dst)) { break; } /* passthrough */ case 0x80: net_icmpv6_send_error(pkt, NET_ICMPV6_PARAM_PROBLEM, NET_ICMPV6_PARAM_PROB_OPTION, (u32_t)length); break; } return true; } static inline int ipv6_handle_ext_hdr_options(struct net_pkt *pkt, struct net_ipv6_hdr *hdr, u16_t pkt_len) { u16_t exthdr_len = 0U; u16_t length = 0U; if (net_pkt_read_u8(pkt, (u8_t *)&exthdr_len)) { return -ENOBUFS; } exthdr_len = exthdr_len * 8U + 8; if (exthdr_len > pkt_len) { NET_DBG("Corrupted packet, extension header %d too long " "(max %d bytes)", exthdr_len, pkt_len); return -EINVAL; } length += 2U; while (length < exthdr_len) { u8_t opt_type, opt_len; /* Each extension option has type and length */ if (net_pkt_read_u8(pkt, &opt_type)) { return -ENOBUFS; } if (opt_type != NET_IPV6_EXT_HDR_OPT_PAD1) { if (net_pkt_read_u8(pkt, &opt_len)) { return -ENOBUFS; } } switch (opt_type) { case NET_IPV6_EXT_HDR_OPT_PAD1: length++; break; case NET_IPV6_EXT_HDR_OPT_PADN: NET_DBG("PADN option"); length += opt_len + 2; break; default: /* Make sure that the option length is not too large. * The former 1 + 1 is the length of extension type + * length fields. * The latter 1 + 1 is the length of the sub-option * type and length fields. */ if (opt_len > (exthdr_len - (1 + 1 + 1 + 1))) { return -EINVAL; } if (ipv6_drop_on_unknown_option(pkt, hdr, opt_type, length)) { return -ENOTSUP; } if (net_pkt_skip(pkt, opt_len)) { return -ENOBUFS; } length += opt_len + 2; break; } } return exthdr_len; } #if defined(CONFIG_NET_ROUTE) static struct net_route_entry *add_route(struct net_if *iface, struct in6_addr *addr, u8_t prefix_len) { struct net_route_entry *route; route = net_route_lookup(iface, addr); if (route) { return route; } route = net_route_add(iface, addr, prefix_len, addr); NET_DBG("%s route to %s/%d iface %p", route ? "Add" : "Cannot add", log_strdup(net_sprint_ipv6_addr(addr)), prefix_len, iface); return route; } #endif /* CONFIG_NET_ROUTE */ static void ipv6_no_route_info(struct net_pkt *pkt, struct in6_addr *src, struct in6_addr *dst) { NET_DBG("Will not route pkt %p ll src %s to dst %s between interfaces", pkt, log_strdup(net_sprint_ipv6_addr(src)), log_strdup(net_sprint_ipv6_addr(dst))); } #if defined(CONFIG_NET_ROUTE) static enum net_verdict ipv6_route_packet(struct net_pkt *pkt, struct net_ipv6_hdr *hdr) { struct net_route_entry *route; struct in6_addr *nexthop; bool found; /* Check if the packet can be routed */ if (IS_ENABLED(CONFIG_NET_ROUTING)) { found = net_route_get_info(NULL, &hdr->dst, &route, &nexthop); } else { found = net_route_get_info(net_pkt_iface(pkt), &hdr->dst, &route, &nexthop); } if (found) { int ret; if (IS_ENABLED(CONFIG_NET_ROUTING) && (net_ipv6_is_ll_addr(&hdr->src) || net_ipv6_is_ll_addr(&hdr->dst))) { /* RFC 4291 ch 2.5.6 */ ipv6_no_route_info(pkt, &hdr->src, &hdr->dst); goto drop; } /* Used when detecting if the original link * layer address length is changed or not. */ net_pkt_set_orig_iface(pkt, net_pkt_iface(pkt)); if (route) { net_pkt_set_iface(pkt, route->iface); } if (IS_ENABLED(CONFIG_NET_ROUTING) && net_pkt_orig_iface(pkt) != net_pkt_iface(pkt)) { /* If the route interface to destination is * different than the original route, then add * route to original source. */ NET_DBG("Route pkt %p from %p to %p", pkt, net_pkt_orig_iface(pkt), net_pkt_iface(pkt)); add_route(net_pkt_orig_iface(pkt), &hdr->src, 128); } ret = net_route_packet(pkt, nexthop); if (ret < 0) { NET_DBG("Cannot re-route pkt %p via %s " "at iface %p (%d)", pkt, log_strdup(net_sprint_ipv6_addr(nexthop)), net_pkt_iface(pkt), ret); } else { return NET_OK; } } else { NET_DBG("No route to %s pkt %p dropped", log_strdup(net_sprint_ipv6_addr(&hdr->dst)), pkt); } drop: return NET_DROP; } #else static inline enum net_verdict ipv6_route_packet(struct net_pkt *pkt, struct net_ipv6_hdr *hdr) { ARG_UNUSED(pkt); ARG_UNUSED(hdr); NET_DBG("DROP: Packet %p not for me", pkt); return NET_DROP; } #endif /* CONFIG_NET_ROUTE */ enum net_verdict net_ipv6_input(struct net_pkt *pkt, bool is_loopback) { NET_PKT_DATA_ACCESS_CONTIGUOUS_DEFINE(ipv6_access, struct net_ipv6_hdr); NET_PKT_DATA_ACCESS_DEFINE(udp_access, struct net_udp_hdr); NET_PKT_DATA_ACCESS_DEFINE(tcp_access, struct net_tcp_hdr); enum net_verdict verdict = NET_DROP; int real_len = net_pkt_get_len(pkt); u8_t ext_bitmap = 0U; u16_t ext_len = 0U; u8_t nexthdr, next_nexthdr, prev_hdr_offset; union net_proto_header proto_hdr; struct net_ipv6_hdr *hdr; union net_ip_header ip; int pkt_len; net_stats_update_ipv6_recv(net_pkt_iface(pkt)); hdr = (struct net_ipv6_hdr *)net_pkt_get_data(pkt, &ipv6_access); if (!hdr) { NET_DBG("DROP: no buffer"); goto drop; } pkt_len = ntohs(hdr->len) + sizeof(struct net_ipv6_hdr); if (real_len < pkt_len) { NET_DBG("DROP: pkt len per hdr %d != pkt real len %d", pkt_len, real_len); goto drop; } else if (real_len > pkt_len) { net_pkt_update_length(pkt, pkt_len); } NET_DBG("IPv6 packet len %d received from %s to %s", pkt_len, log_strdup(net_sprint_ipv6_addr(&hdr->src)), log_strdup(net_sprint_ipv6_addr(&hdr->dst))); if (net_ipv6_is_addr_unspecified(&hdr->src)) { NET_DBG("DROP: src addr is %s", "unspecified"); goto drop; } if (net_ipv6_is_addr_mcast(&hdr->src) || net_ipv6_is_addr_mcast_scope(&hdr->dst, 0)) { NET_DBG("DROP: multicast packet"); goto drop; } if (!is_loopback) { if (net_ipv6_is_addr_loopback(&hdr->dst) || net_ipv6_is_addr_loopback(&hdr->src)) { NET_DBG("DROP: ::1 packet"); goto drop; } if (net_ipv6_is_addr_mcast_iface(&hdr->dst) || (net_ipv6_is_addr_mcast_group( &hdr->dst, net_ipv6_unspecified_address()) && (net_ipv6_is_addr_mcast_site(&hdr->dst) || net_ipv6_is_addr_mcast_org(&hdr->dst)))) { NET_DBG("DROP: invalid scope multicast packet"); goto drop; } } /* Check extension headers */ net_pkt_set_ipv6_next_hdr(pkt, hdr->nexthdr); net_pkt_set_ipv6_ext_len(pkt, 0); net_pkt_set_ip_hdr_len(pkt, sizeof(struct net_ipv6_hdr)); net_pkt_set_ipv6_hop_limit(pkt, NET_IPV6_HDR(pkt)->hop_limit); if (!net_ipv6_is_my_addr(&hdr->dst) && !net_ipv6_is_my_maddr(&hdr->dst) && !net_ipv6_is_addr_mcast(&hdr->dst)) { if (ipv6_route_packet(pkt, hdr) == NET_OK) { return NET_OK; } goto drop; } /* If we receive a packet with ll source address fe80: and destination * address is one of ours, and if the packet would cross interface * boundary, then drop the packet. RFC 4291 ch 2.5.6 */ if (IS_ENABLED(CONFIG_NET_ROUTING) && net_ipv6_is_ll_addr(&hdr->src) && !net_ipv6_is_addr_mcast(&hdr->dst) && !net_if_ipv6_addr_lookup_by_iface(net_pkt_iface(pkt), &hdr->dst)) { ipv6_no_route_info(pkt, &hdr->src, &hdr->dst); goto drop; } net_pkt_acknowledge_data(pkt, &ipv6_access); nexthdr = hdr->nexthdr; prev_hdr_offset = (u8_t *)&hdr->nexthdr - (u8_t *)hdr; while (!net_ipv6_is_nexthdr_upper_layer(nexthdr)) { int exthdr_len; NET_DBG("IPv6 next header %d", nexthdr); if (net_pkt_read_u8(pkt, &next_nexthdr)) { goto drop; } switch (nexthdr) { case NET_IPV6_NEXTHDR_HBHO: if (ext_bitmap & NET_IPV6_EXT_HDR_BITMAP_HBHO) { NET_ERR("DROP: multiple hop-by-hop"); goto drop; } /* HBH option needs to be the first one */ if (nexthdr != hdr->nexthdr) { goto bad_hdr; } ext_bitmap |= NET_IPV6_EXT_HDR_BITMAP_HBHO; break; case NET_IPV6_NEXTHDR_DESTO: if (ext_bitmap & NET_IPV6_EXT_HDR_BITMAP_DESTO2) { /* DESTO option cannot appear more than twice */ goto bad_hdr; } if (ext_bitmap & NET_IPV6_EXT_HDR_BITMAP_DESTO1) { ext_bitmap |= NET_IPV6_EXT_HDR_BITMAP_DESTO2; } else { ext_bitmap |= NET_IPV6_EXT_HDR_BITMAP_DESTO1; } break; case NET_IPV6_NEXTHDR_FRAG: if (IS_ENABLED(CONFIG_NET_IPV6_FRAGMENT)) { net_pkt_set_ipv6_hdr_prev(pkt, prev_hdr_offset); net_pkt_set_ipv6_fragment_start( pkt, net_pkt_get_current_offset(pkt) - 1); return net_ipv6_handle_fragment_hdr(pkt, hdr, nexthdr); } goto bad_hdr; case NET_IPV6_NEXTHDR_NONE: /* There is nothing after this header (see RFC 2460, * ch 4.7), so we can drop the packet now. * This is not an error case so do not update drop * statistics. */ return NET_DROP; default: goto bad_hdr; } exthdr_len = ipv6_handle_ext_hdr_options(pkt, hdr, pkt_len); if (exthdr_len < 0) { goto drop; } ext_len += exthdr_len; nexthdr = next_nexthdr; } net_pkt_set_ipv6_ext_len(pkt, ext_len); net_pkt_set_family(pkt, PF_INET6); switch (nexthdr) { case IPPROTO_ICMPV6: verdict = net_icmpv6_input(pkt, hdr); break; case IPPROTO_TCP: proto_hdr.tcp = net_tcp_input(pkt, &tcp_access); if (proto_hdr.tcp) { verdict = NET_OK; } break; case IPPROTO_UDP: proto_hdr.udp = net_udp_input(pkt, &udp_access); if (proto_hdr.udp) { verdict = NET_OK; } break; } if (verdict == NET_DROP) { goto drop; } else if (nexthdr == IPPROTO_ICMPV6) { return verdict; } ip.ipv6 = hdr; verdict = net_conn_input(pkt, &ip, nexthdr, &proto_hdr); if (verdict != NET_DROP) { return verdict; } drop: net_stats_update_ipv6_drop(net_pkt_iface(pkt)); return NET_DROP; bad_hdr: /* Send error message about parameter problem (RFC 2460) */ net_icmpv6_send_error(pkt, NET_ICMPV6_PARAM_PROBLEM, NET_ICMPV6_PARAM_PROB_NEXTHEADER, net_pkt_get_current_offset(pkt) - 1); NET_DBG("DROP: Unknown/wrong nexthdr type"); net_stats_update_ip_errors_protoerr(net_pkt_iface(pkt)); return NET_DROP; } void net_ipv6_init(void) { net_ipv6_nbr_init(); #if defined(CONFIG_NET_IPV6_MLD) net_ipv6_mld_init(); #endif } |