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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 | /** @file * @brief Network initialization * * Initialize the network IP stack. Create one thread for reading data * from IP stack and passing that data to applications (Rx thread). */ /* * Copyright (c) 2016 Intel Corporation * * SPDX-License-Identifier: Apache-2.0 */ #include <zephyr/logging/log.h> LOG_MODULE_REGISTER(net_core, CONFIG_NET_CORE_LOG_LEVEL); #include <zephyr/init.h> #include <zephyr/kernel.h> #include <zephyr/tracing/tracing.h> #include <zephyr/toolchain.h> #include <zephyr/linker/sections.h> #include <string.h> #include <errno.h> #include <zephyr/net/ipv4_autoconf.h> #include <zephyr/net/net_if.h> #include <zephyr/net/net_mgmt.h> #include <zephyr/net/net_pkt.h> #include <zephyr/net/net_core.h> #include <zephyr/net/dns_resolve.h> #include <zephyr/net/gptp.h> #include <zephyr/net/websocket.h> #include <zephyr/net/ethernet.h> #include <zephyr/net/capture.h> #if defined(CONFIG_NET_LLDP) #include <zephyr/net/lldp.h> #endif #include "net_private.h" #include "shell/net_shell.h" #include "icmpv6.h" #include "ipv6.h" #include "icmpv4.h" #include "ipv4.h" #include "dhcpv4/dhcpv4_internal.h" #include "dhcpv6/dhcpv6_internal.h" #include "route.h" #include "packet_socket.h" #include "canbus_socket.h" #include "connection.h" #include "udp_internal.h" #include "tcp_internal.h" #include "net_stats.h" #if defined(CONFIG_NET_NATIVE) static inline enum net_verdict process_data(struct net_pkt *pkt, bool is_loopback) { int ret; bool locally_routed = false; net_pkt_set_l2_processed(pkt, false); /* Initial call will forward packets to SOCK_RAW packet sockets. */ ret = net_packet_socket_input(pkt, ETH_P_ALL); if (ret != NET_CONTINUE) { return ret; } /* If the packet is routed back to us when we have reassembled an IPv4 or IPv6 packet, * then do not pass it to L2 as the packet does not have link layer headers in it. */ if (net_pkt_is_ip_reassembled(pkt)) { locally_routed = true; } /* If there is no data, then drop the packet. */ if (!pkt->frags) { NET_DBG("Corrupted packet (frags %p)", pkt->frags); net_stats_update_processing_error(net_pkt_iface(pkt)); return NET_DROP; } if (!is_loopback && !locally_routed) { ret = net_if_recv_data(net_pkt_iface(pkt), pkt); if (ret != NET_CONTINUE) { if (ret == NET_DROP) { NET_DBG("Packet %p discarded by L2", pkt); net_stats_update_processing_error( net_pkt_iface(pkt)); } return ret; } } net_pkt_set_l2_processed(pkt, true); /* L2 has modified the buffer starting point, it is easier * to re-initialize the cursor rather than updating it. */ net_pkt_cursor_init(pkt); if (IS_ENABLED(CONFIG_NET_SOCKETS_PACKET_DGRAM)) { /* Consecutive call will forward packets to SOCK_DGRAM packet sockets * (after L2 removed header). */ ret = net_packet_socket_input(pkt, ETH_P_ALL); if (ret != NET_CONTINUE) { return ret; } } uint8_t family = net_pkt_family(pkt); if (IS_ENABLED(CONFIG_NET_IP) && (family == AF_INET || family == AF_INET6 || family == AF_UNSPEC || family == AF_PACKET)) { /* L2 processed, now we can pass IPPROTO_RAW to packet socket: */ ret = net_packet_socket_input(pkt, IPPROTO_RAW); if (ret != NET_CONTINUE) { return ret; } /* IP version and header length. */ uint8_t vtc_vhl = NET_IPV6_HDR(pkt)->vtc & 0xf0; if (IS_ENABLED(CONFIG_NET_IPV6) && vtc_vhl == 0x60) { return net_ipv6_input(pkt, is_loopback); } else if (IS_ENABLED(CONFIG_NET_IPV4) && vtc_vhl == 0x40) { return net_ipv4_input(pkt, is_loopback); } NET_DBG("Unknown IP family packet (0x%x)", NET_IPV6_HDR(pkt)->vtc & 0xf0); net_stats_update_ip_errors_protoerr(net_pkt_iface(pkt)); net_stats_update_ip_errors_vhlerr(net_pkt_iface(pkt)); return NET_DROP; } else if (IS_ENABLED(CONFIG_NET_SOCKETS_CAN) && family == AF_CAN) { return net_canbus_socket_input(pkt); } NET_DBG("Unknown protocol family packet (0x%x)", family); return NET_DROP; } static void processing_data(struct net_pkt *pkt, bool is_loopback) { again: switch (process_data(pkt, is_loopback)) { case NET_CONTINUE: if (IS_ENABLED(CONFIG_NET_L2_VIRTUAL)) { /* If we have a tunneling packet, feed it back * to the stack in this case. */ goto again; } else { NET_DBG("Dropping pkt %p", pkt); net_pkt_unref(pkt); } break; case NET_OK: NET_DBG("Consumed pkt %p", pkt); break; case NET_DROP: default: NET_DBG("Dropping pkt %p", pkt); net_pkt_unref(pkt); break; } } /* Things to setup after we are able to RX and TX */ static void net_post_init(void) { #if defined(CONFIG_NET_LLDP) net_lldp_init(); #endif #if defined(CONFIG_NET_GPTP) net_gptp_init(); #endif } static inline void copy_ll_addr(struct net_pkt *pkt) { memcpy(net_pkt_lladdr_src(pkt), net_pkt_lladdr_if(pkt), sizeof(struct net_linkaddr)); memcpy(net_pkt_lladdr_dst(pkt), net_pkt_lladdr_if(pkt), sizeof(struct net_linkaddr)); } /* Check if the IPv{4|6} addresses are proper. As this can be expensive, * make this optional. We still check the IPv4 TTL and IPv6 hop limit * if the corresponding protocol family is enabled. */ static inline int check_ip(struct net_pkt *pkt) { uint8_t family; int ret; if (!IS_ENABLED(CONFIG_NET_IP)) { return 0; } family = net_pkt_family(pkt); ret = 0; if (IS_ENABLED(CONFIG_NET_IPV6) && family == AF_INET6) { /* Drop IPv6 packet if hop limit is 0 */ if (NET_IPV6_HDR(pkt)->hop_limit == 0) { NET_DBG("DROP: IPv6 hop limit"); ret = -ENOMSG; /* silently drop the pkt, not an error */ goto drop; } if (!IS_ENABLED(CONFIG_NET_IP_ADDR_CHECK)) { return 0; } #if defined(CONFIG_NET_LOOPBACK) /* If loopback driver is enabled, then send packets to it * as the address check is not needed. */ if (net_if_l2(net_pkt_iface(pkt)) == &NET_L2_GET_NAME(DUMMY)) { return 0; } #endif if (net_ipv6_addr_cmp((struct in6_addr *)NET_IPV6_HDR(pkt)->dst, net_ipv6_unspecified_address())) { NET_DBG("DROP: IPv6 dst address missing"); ret = -EADDRNOTAVAIL; goto drop; } /* If the destination address is our own, then route it * back to us (if it is not already forwarded). */ if ((net_ipv6_is_addr_loopback( (struct in6_addr *)NET_IPV6_HDR(pkt)->dst) || net_ipv6_is_my_addr( (struct in6_addr *)NET_IPV6_HDR(pkt)->dst)) && !net_pkt_forwarding(pkt)) { struct in6_addr addr; /* Swap the addresses so that in receiving side * the packet is accepted. */ net_ipv6_addr_copy_raw((uint8_t *)&addr, NET_IPV6_HDR(pkt)->src); net_ipv6_addr_copy_raw(NET_IPV6_HDR(pkt)->src, NET_IPV6_HDR(pkt)->dst); net_ipv6_addr_copy_raw(NET_IPV6_HDR(pkt)->dst, (uint8_t *)&addr); net_pkt_set_ll_proto_type(pkt, ETH_P_IPV6); copy_ll_addr(pkt); return 1; } /* If the destination address is interface local scope * multicast address, then loop the data back to us. * The FF01:: multicast addresses are only meant to be used * in local host, so this is similar as how ::1 unicast * addresses are handled. See RFC 3513 ch 2.7 for details. */ if (net_ipv6_is_addr_mcast_iface( (struct in6_addr *)NET_IPV6_HDR(pkt)->dst)) { NET_DBG("IPv6 interface scope mcast dst address"); return 1; } /* The source check must be done after the destination check * as having src ::1 is perfectly ok if dst is ::1 too. */ if (net_ipv6_is_addr_loopback( (struct in6_addr *)NET_IPV6_HDR(pkt)->src)) { NET_DBG("DROP: IPv6 loopback src address"); ret = -EADDRNOTAVAIL; goto drop; } } else if (IS_ENABLED(CONFIG_NET_IPV4) && family == AF_INET) { /* Drop IPv4 packet if ttl is 0 */ if (NET_IPV4_HDR(pkt)->ttl == 0) { NET_DBG("DROP: IPv4 ttl"); ret = -ENOMSG; /* silently drop the pkt, not an error */ goto drop; } if (!IS_ENABLED(CONFIG_NET_IP_ADDR_CHECK)) { return 0; } #if defined(CONFIG_NET_LOOPBACK) /* If loopback driver is enabled, then send packets to it * as the address check is not needed. */ if (net_if_l2(net_pkt_iface(pkt)) == &NET_L2_GET_NAME(DUMMY)) { return 0; } #endif if (net_ipv4_addr_cmp((struct in_addr *)NET_IPV4_HDR(pkt)->dst, net_ipv4_unspecified_address())) { NET_DBG("DROP: IPv4 dst address missing"); ret = -EADDRNOTAVAIL; goto drop; } /* If the destination address is our own, then route it * back to us. */ if (net_ipv4_is_addr_loopback((struct in_addr *)NET_IPV4_HDR(pkt)->dst) || (net_ipv4_is_addr_bcast(net_pkt_iface(pkt), (struct in_addr *)NET_IPV4_HDR(pkt)->dst) == false && net_ipv4_is_my_addr((struct in_addr *)NET_IPV4_HDR(pkt)->dst))) { struct in_addr addr; /* Swap the addresses so that in receiving side * the packet is accepted. */ net_ipv4_addr_copy_raw((uint8_t *)&addr, NET_IPV4_HDR(pkt)->src); net_ipv4_addr_copy_raw(NET_IPV4_HDR(pkt)->src, NET_IPV4_HDR(pkt)->dst); net_ipv4_addr_copy_raw(NET_IPV4_HDR(pkt)->dst, (uint8_t *)&addr); net_pkt_set_ll_proto_type(pkt, ETH_P_IP); copy_ll_addr(pkt); return 1; } /* The source check must be done after the destination check * as having src 127.0.0.0/8 is perfectly ok if dst is in * localhost subnet too. */ if (net_ipv4_is_addr_loopback((struct in_addr *)NET_IPV4_HDR(pkt)->src)) { NET_DBG("DROP: IPv4 loopback src address"); ret = -EADDRNOTAVAIL; goto drop; } } return ret; drop: if (IS_ENABLED(CONFIG_NET_STATISTICS)) { if (family == AF_INET6) { net_stats_update_ipv6_drop(net_pkt_iface(pkt)); } else { net_stats_update_ipv4_drop(net_pkt_iface(pkt)); } } return ret; } /* Called when data needs to be sent to network */ int net_send_data(struct net_pkt *pkt) { int status; int ret; SYS_PORT_TRACING_FUNC_ENTER(net, send_data, pkt); if (!pkt || !pkt->frags) { ret = -ENODATA; goto err; } if (!net_pkt_iface(pkt)) { ret = -EINVAL; goto err; } net_pkt_trim_buffer(pkt); net_pkt_cursor_init(pkt); status = check_ip(pkt); if (status < 0) { /* Special handling for ENOMSG which is returned if packet * TTL is 0 or hop limit is 0. This is not an error as it is * perfectly valid case to set the limit to 0. In this case * we just silently drop the packet by returning 0. */ if (status == -ENOMSG) { ret = 0; goto err; } return status; } else if (status > 0) { /* Packet is destined back to us so send it directly * to RX processing. */ NET_DBG("Loopback pkt %p back to us", pkt); processing_data(pkt, true); ret = 0; goto err; } if (net_if_send_data(net_pkt_iface(pkt), pkt) == NET_DROP) { ret = -EIO; goto err; } if (IS_ENABLED(CONFIG_NET_STATISTICS)) { switch (net_pkt_family(pkt)) { case AF_INET: net_stats_update_ipv4_sent(net_pkt_iface(pkt)); break; case AF_INET6: net_stats_update_ipv6_sent(net_pkt_iface(pkt)); break; } } ret = 0; err: SYS_PORT_TRACING_FUNC_EXIT(net, send_data, pkt, ret); return ret; } static void net_rx(struct net_if *iface, struct net_pkt *pkt) { bool is_loopback = false; size_t pkt_len; pkt_len = net_pkt_get_len(pkt); NET_DBG("Received pkt %p len %zu", pkt, pkt_len); net_stats_update_bytes_recv(iface, pkt_len); if (IS_ENABLED(CONFIG_NET_LOOPBACK)) { #ifdef CONFIG_NET_L2_DUMMY if (net_if_l2(iface) == &NET_L2_GET_NAME(DUMMY)) { is_loopback = true; } #endif } processing_data(pkt, is_loopback); net_print_statistics(); net_pkt_print(); } void net_process_rx_packet(struct net_pkt *pkt) { net_pkt_set_rx_stats_tick(pkt, k_cycle_get_32()); net_capture_pkt(net_pkt_iface(pkt), pkt); net_rx(net_pkt_iface(pkt), pkt); } static void net_queue_rx(struct net_if *iface, struct net_pkt *pkt) { uint8_t prio = net_pkt_priority(pkt); uint8_t tc = net_rx_priority2tc(prio); #if defined(CONFIG_NET_STATISTICS) net_stats_update_tc_recv_pkt(iface, tc); net_stats_update_tc_recv_bytes(iface, tc, net_pkt_get_len(pkt)); net_stats_update_tc_recv_priority(iface, tc, prio); #endif #if NET_TC_RX_COUNT > 1 NET_DBG("TC %d with prio %d pkt %p", tc, prio, pkt); #endif if (NET_TC_RX_COUNT == 0) { net_process_rx_packet(pkt); } else { net_tc_submit_to_rx_queue(tc, pkt); } } /* Called by driver when a packet has been received */ int net_recv_data(struct net_if *iface, struct net_pkt *pkt) { int ret; SYS_PORT_TRACING_FUNC_ENTER(net, recv_data, iface, pkt); if (!pkt || !iface) { ret = -EINVAL; goto err; } if (net_pkt_is_empty(pkt)) { ret = -ENODATA; goto err; } if (!net_if_flag_is_set(iface, NET_IF_UP)) { ret = -ENETDOWN; goto err; } net_pkt_set_overwrite(pkt, true); net_pkt_cursor_init(pkt); NET_DBG("prio %d iface %p pkt %p len %zu", net_pkt_priority(pkt), iface, pkt, net_pkt_get_len(pkt)); if (IS_ENABLED(CONFIG_NET_ROUTING)) { net_pkt_set_orig_iface(pkt, iface); } net_pkt_set_iface(pkt, iface); if (!net_pkt_filter_recv_ok(pkt)) { /* silently drop the packet */ net_pkt_unref(pkt); } else { net_queue_rx(iface, pkt); } ret = 0; err: SYS_PORT_TRACING_FUNC_EXIT(net, recv_data, iface, pkt, ret); return ret; } static inline void l3_init(void) { net_icmpv4_init(); net_icmpv6_init(); net_ipv4_init(); net_ipv6_init(); net_ipv4_autoconf_init(); if (IS_ENABLED(CONFIG_NET_UDP) || IS_ENABLED(CONFIG_NET_TCP) || IS_ENABLED(CONFIG_NET_SOCKETS_PACKET) || IS_ENABLED(CONFIG_NET_SOCKETS_CAN)) { net_conn_init(); } net_tcp_init(); net_route_init(); NET_DBG("Network L3 init done"); } #else /* CONFIG_NET_NATIVE */ #define l3_init(...) #define net_post_init(...) int net_send_data(struct net_pkt *pkt) { ARG_UNUSED(pkt); return -ENOTSUP; } int net_recv_data(struct net_if *iface, struct net_pkt *pkt) { ARG_UNUSED(iface); ARG_UNUSED(pkt); return -ENOTSUP; } #endif /* CONFIG_NET_NATIVE */ static void init_rx_queues(void) { /* Starting TX side. The ordering is important here and the TX * can only be started when RX side is ready to receive packets. */ net_if_init(); net_tc_rx_init(); /* This will take the interface up and start everything. */ net_if_post_init(); /* Things to init after network interface is working */ net_post_init(); } static inline int services_init(void) { int status; socket_service_init(); status = net_dhcpv4_init(); if (status) { return status; } status = net_dhcpv6_init(); if (status != 0) { return status; } net_dhcpv4_server_init(); dns_dispatcher_init(); dns_init_resolver(); mdns_init_responder(); websocket_init(); net_coap_init(); net_shell_init(); return status; } static int net_init(void) { net_hostname_init(); NET_DBG("Priority %d", CONFIG_NET_INIT_PRIO); net_pkt_init(); net_context_init(); l3_init(); net_mgmt_event_init(); init_rx_queues(); return services_init(); } SYS_INIT(net_init, POST_KERNEL, CONFIG_NET_INIT_PRIO); |