| 718e3744 |
1 | /* Kernel routing table updates using netlink over GNU/Linux system. |
| 2 | * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro |
| 3 | * |
| 4 | * This file is part of GNU Zebra. |
| 5 | * |
| 6 | * GNU Zebra is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License as published by the |
| 8 | * Free Software Foundation; either version 2, or (at your option) any |
| 9 | * later version. |
| 10 | * |
| 11 | * GNU Zebra is distributed in the hope that it will be useful, but |
| 12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with GNU Zebra; see the file COPYING. If not, write to the Free |
| 18 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
| 19 | * 02111-1307, USA. |
| 20 | */ |
| 21 | |
| 22 | #include <zebra.h> |
| 23 | |
| 24 | /* Hack for GNU libc version 2. */ |
| 25 | #ifndef MSG_TRUNC |
| 26 | #define MSG_TRUNC 0x20 |
| 27 | #endif /* MSG_TRUNC */ |
| 28 | |
| 29 | #include "linklist.h" |
| 30 | #include "if.h" |
| 31 | #include "log.h" |
| 32 | #include "prefix.h" |
| 33 | #include "connected.h" |
| 34 | #include "table.h" |
| 35 | #include "rib.h" |
| 36 | |
| 37 | #include "zebra/zserv.h" |
| 38 | #include "zebra/redistribute.h" |
| 39 | #include "zebra/interface.h" |
| 40 | #include "zebra/debug.h" |
| 41 | |
| 42 | /* Socket interface to kernel */ |
| 43 | struct nlsock |
| 44 | { |
| 45 | int sock; |
| 46 | int seq; |
| 47 | struct sockaddr_nl snl; |
| 48 | char *name; |
| 49 | } netlink = { -1, 0, {0}, "netlink-listen" }, /* kernel messages */ |
| 50 | netlink_cmd = { -1, 0, {0}, "netlink-cmd" }, /* command channel */ |
| 51 | netlink_addr = {-1, 0, {0}, "netlink-addr" }; /* address channel */ |
| 52 | |
| 53 | struct message nlmsg_str[] = |
| 54 | { |
| 55 | {RTM_NEWROUTE, "RTM_NEWROUTE"}, |
| 56 | {RTM_DELROUTE, "RTM_DELROUTE"}, |
| 57 | {RTM_GETROUTE, "RTM_GETROUTE"}, |
| 58 | {RTM_NEWLINK, "RTM_NEWLINK"}, |
| 59 | {RTM_DELLINK, "RTM_DELLINK"}, |
| 60 | {RTM_GETLINK, "RTM_GETLINK"}, |
| 61 | {RTM_NEWADDR, "RTM_NEWADDR"}, |
| 62 | {RTM_DELADDR, "RTM_DELADDR"}, |
| 63 | {RTM_GETADDR, "RTM_GETADDR"}, |
| 64 | {0, NULL} |
| 65 | }; |
| 66 | |
| 67 | extern int rtm_table_default; |
| 68 | |
| 69 | /* Make socket for Linux netlink interface. */ |
| 70 | static int |
| 71 | netlink_socket (struct nlsock *nl, unsigned long groups) |
| 72 | { |
| 73 | int ret; |
| 74 | struct sockaddr_nl snl; |
| 75 | int sock; |
| 76 | int namelen; |
| 77 | |
| 78 | sock = socket (AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); |
| 79 | if (sock < 0) |
| 80 | { |
| 81 | zlog (NULL, LOG_ERR, "Can't open %s socket: %s", nl->name, |
| 82 | strerror (errno)); |
| 83 | return -1; |
| 84 | } |
| 85 | |
| 86 | ret = fcntl (sock, F_SETFL, O_NONBLOCK); |
| 87 | if (ret < 0) |
| 88 | { |
| 89 | zlog (NULL, LOG_ERR, "Can't set %s socket flags: %s", nl->name, |
| 90 | strerror (errno)); |
| 91 | close (sock); |
| 92 | return -1; |
| 93 | } |
| 94 | |
| 95 | memset (&snl, 0, sizeof snl); |
| 96 | snl.nl_family = AF_NETLINK; |
| 97 | snl.nl_groups = groups; |
| 98 | |
| 99 | /* Bind the socket to the netlink structure for anything. */ |
| 100 | ret = bind (sock, (struct sockaddr *) &snl, sizeof snl); |
| 101 | if (ret < 0) |
| 102 | { |
| 103 | zlog (NULL, LOG_ERR, "Can't bind %s socket to group 0x%x: %s", |
| 104 | nl->name, snl.nl_groups, strerror (errno)); |
| 105 | close (sock); |
| 106 | return -1; |
| 107 | } |
| 108 | |
| 109 | /* multiple netlink sockets will have different nl_pid */ |
| 110 | namelen = sizeof snl; |
| 111 | ret = getsockname (sock, (struct sockaddr *) &snl, &namelen); |
| 112 | if (ret < 0 || namelen != sizeof snl) |
| 113 | { |
| 114 | zlog (NULL, LOG_ERR, "Can't get %s socket name: %s", nl->name, |
| 115 | strerror (errno)); |
| 116 | close (sock); |
| 117 | return -1; |
| 118 | } |
| 119 | |
| 120 | nl->snl = snl; |
| 121 | nl->sock = sock; |
| 122 | return ret; |
| 123 | } |
| 124 | |
| 125 | /* Get type specified information from netlink. */ |
| 126 | static int |
| 127 | netlink_request (int family, int type, struct nlsock *nl) |
| 128 | { |
| 129 | int ret; |
| 130 | struct sockaddr_nl snl; |
| 131 | |
| 132 | struct |
| 133 | { |
| 134 | struct nlmsghdr nlh; |
| 135 | struct rtgenmsg g; |
| 136 | } req; |
| 137 | |
| 138 | |
| 139 | /* Check netlink socket. */ |
| 140 | if (nl->sock < 0) |
| 141 | { |
| 142 | zlog (NULL, LOG_ERR, "%s socket isn't active.", nl->name); |
| 143 | return -1; |
| 144 | } |
| 145 | |
| 146 | memset (&snl, 0, sizeof snl); |
| 147 | snl.nl_family = AF_NETLINK; |
| 148 | |
| 149 | req.nlh.nlmsg_len = sizeof req; |
| 150 | req.nlh.nlmsg_type = type; |
| 151 | req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST; |
| 152 | req.nlh.nlmsg_pid = 0; |
| 153 | req.nlh.nlmsg_seq = ++nl->seq; |
| 154 | req.g.rtgen_family = family; |
| 155 | |
| 156 | ret = sendto (nl->sock, (void*) &req, sizeof req, 0, |
| 157 | (struct sockaddr*) &snl, sizeof snl); |
| 158 | if (ret < 0) |
| 159 | { |
| 160 | zlog (NULL, LOG_ERR, "%s sendto failed: %s", nl->name, strerror (errno)); |
| 161 | return -1; |
| 162 | } |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | /* Receive message from netlink interface and pass those information |
| 167 | to the given function. */ |
| 168 | static int |
| 169 | netlink_parse_info (int (*filter) (struct sockaddr_nl *, struct nlmsghdr *), |
| 170 | struct nlsock *nl) |
| 171 | { |
| 172 | int status; |
| 173 | int ret = 0; |
| 174 | int error; |
| 175 | |
| 176 | while (1) |
| 177 | { |
| 178 | char buf[4096]; |
| 179 | struct iovec iov = { buf, sizeof buf }; |
| 180 | struct sockaddr_nl snl; |
| 181 | struct msghdr msg = { (void*)&snl, sizeof snl, &iov, 1, NULL, 0, 0}; |
| 182 | struct nlmsghdr *h; |
| 183 | |
| 184 | status = recvmsg (nl->sock, &msg, 0); |
| 185 | |
| 186 | if (status < 0) |
| 187 | { |
| 188 | if (errno == EINTR) |
| 189 | continue; |
| 190 | if (errno == EWOULDBLOCK || errno == EAGAIN) |
| 191 | break; |
| 192 | zlog (NULL, LOG_ERR, "%s recvmsg overrun", nl->name); |
| 193 | continue; |
| 194 | } |
| 195 | |
| 196 | if (status == 0) |
| 197 | { |
| 198 | zlog (NULL, LOG_ERR, "%s EOF", nl->name); |
| 199 | return -1; |
| 200 | } |
| 201 | |
| 202 | if (msg.msg_namelen != sizeof snl) |
| 203 | { |
| 204 | zlog (NULL, LOG_ERR, "%s sender address length error: length %d", |
| 205 | nl->name, msg.msg_namelen); |
| 206 | return -1; |
| 207 | } |
| 208 | |
| 209 | for (h = (struct nlmsghdr *) buf; NLMSG_OK (h, status); |
| 210 | h = NLMSG_NEXT (h, status)) |
| 211 | { |
| 212 | /* Finish of reading. */ |
| 213 | if (h->nlmsg_type == NLMSG_DONE) |
| 214 | return ret; |
| 215 | |
| 216 | /* Error handling. */ |
| 217 | if (h->nlmsg_type == NLMSG_ERROR) |
| 218 | { |
| 219 | struct nlmsgerr *err = (struct nlmsgerr *) NLMSG_DATA (h); |
| 220 | |
| 221 | /* If the error field is zero, then this is an ACK */ |
| 222 | if (err->error == 0) |
| 223 | { |
| 224 | if (IS_ZEBRA_DEBUG_KERNEL) |
| 225 | { |
| 226 | zlog_info("%s: %s ACK: type=%s(%u), seq=%u, pid=%d", |
| 227 | __FUNCTION__, nl->name, |
| 228 | lookup (nlmsg_str, err->msg.nlmsg_type), |
| 229 | err->msg.nlmsg_type, err->msg.nlmsg_seq, |
| 230 | err->msg.nlmsg_pid); |
| 231 | } |
| 232 | |
| 233 | /* return if not a multipart message, otherwise continue */ |
| 234 | if(!(h->nlmsg_flags & NLM_F_MULTI)) |
| 235 | { |
| 236 | return 0; |
| 237 | } |
| 238 | continue; |
| 239 | } |
| 240 | |
| 241 | if (h->nlmsg_len < NLMSG_LENGTH (sizeof (struct nlmsgerr))) |
| 242 | { |
| 243 | zlog (NULL, LOG_ERR, "%s error: message truncated", |
| 244 | nl->name); |
| 245 | return -1; |
| 246 | } |
| 247 | zlog (NULL, LOG_ERR, "%s error: %s, type=%s(%u), seq=%u, pid=%d", |
| 248 | nl->name, strerror (-err->error), |
| 249 | lookup (nlmsg_str, err->msg.nlmsg_type), |
| 250 | err->msg.nlmsg_type, err->msg.nlmsg_seq, |
| 251 | err->msg.nlmsg_pid); |
| 252 | /* |
| 253 | ret = -1; |
| 254 | continue; |
| 255 | */ |
| 256 | return -1; |
| 257 | } |
| 258 | |
| 259 | /* OK we got netlink message. */ |
| 260 | if (IS_ZEBRA_DEBUG_KERNEL) |
| 261 | zlog_info ("netlink_parse_info: %s type %s(%u), seq=%u, pid=%d", |
| 262 | nl->name, |
| 263 | lookup (nlmsg_str, h->nlmsg_type), h->nlmsg_type, |
| 264 | h->nlmsg_seq, h->nlmsg_pid); |
| 265 | |
| 266 | /* skip unsolicited messages originating from command socket */ |
| 267 | if (nl != &netlink_cmd && h->nlmsg_pid == netlink_cmd.snl.nl_pid) |
| 268 | { |
| 269 | if (IS_ZEBRA_DEBUG_KERNEL) |
| 270 | zlog_info ("netlink_parse_info: %s packet comes from %s", |
| 271 | nl->name, netlink_cmd.name); |
| 272 | continue; |
| 273 | } |
| 274 | |
| 275 | error = (*filter) (&snl, h); |
| 276 | if (error < 0) |
| 277 | { |
| 278 | zlog (NULL, LOG_ERR, "%s filter function error", nl->name); |
| 279 | ret = error; |
| 280 | } |
| 281 | } |
| 282 | |
| 283 | /* After error care. */ |
| 284 | if (msg.msg_flags & MSG_TRUNC) |
| 285 | { |
| 286 | zlog (NULL, LOG_ERR, "%s error: message truncated", nl->name); |
| 287 | continue; |
| 288 | } |
| 289 | if (status) |
| 290 | { |
| 291 | zlog (NULL, LOG_ERR, "%s error: data remnant size %d", nl->name, |
| 292 | status); |
| 293 | return -1; |
| 294 | } |
| 295 | } |
| 296 | return ret; |
| 297 | } |
| 298 | |
| 299 | /* Utility function for parse rtattr. */ |
| 300 | static void |
| 301 | netlink_parse_rtattr (struct rtattr **tb, int max, struct rtattr *rta, int len) |
| 302 | { |
| 303 | while (RTA_OK(rta, len)) |
| 304 | { |
| 305 | if (rta->rta_type <= max) |
| 306 | tb[rta->rta_type] = rta; |
| 307 | rta = RTA_NEXT(rta,len); |
| 308 | } |
| 309 | } |
| 310 | |
| 311 | /* Called from interface_lookup_netlink(). This function is only used |
| 312 | during bootstrap. */ |
| 313 | int |
| 314 | netlink_interface (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| 315 | { |
| 316 | int len; |
| 317 | struct ifinfomsg *ifi; |
| 318 | struct rtattr *tb[IFLA_MAX + 1]; |
| 319 | struct interface *ifp; |
| 320 | char *name; |
| 321 | int i; |
| 322 | |
| 323 | ifi = NLMSG_DATA (h); |
| 324 | |
| 325 | if (h->nlmsg_type != RTM_NEWLINK) |
| 326 | return 0; |
| 327 | |
| 328 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct ifinfomsg)); |
| 329 | if (len < 0) |
| 330 | return -1; |
| 331 | |
| 332 | /* Looking up interface name. */ |
| 333 | memset (tb, 0, sizeof tb); |
| 334 | netlink_parse_rtattr (tb, IFLA_MAX, IFLA_RTA (ifi), len); |
| 335 | if (tb[IFLA_IFNAME] == NULL) |
| 336 | return -1; |
| 337 | name = (char *)RTA_DATA(tb[IFLA_IFNAME]); |
| 338 | |
| 339 | /* Add interface. */ |
| 340 | ifp = if_get_by_name (name); |
| 341 | |
| 342 | ifp->ifindex = ifi->ifi_index; |
| 343 | ifp->flags = ifi->ifi_flags & 0x0000fffff; |
| 344 | ifp->mtu = *(int *)RTA_DATA (tb[IFLA_MTU]); |
| 345 | ifp->metric = 1; |
| 346 | |
| 347 | /* Hardware type and address. */ |
| 348 | ifp->hw_type = ifi->ifi_type; |
| 349 | |
| 350 | if (tb[IFLA_ADDRESS]) |
| 351 | { |
| 352 | int hw_addr_len; |
| 353 | |
| 354 | hw_addr_len = RTA_PAYLOAD(tb[IFLA_ADDRESS]); |
| 355 | |
| 356 | if (hw_addr_len > INTERFACE_HWADDR_MAX) |
| 357 | zlog_warn ("Hardware address is too large: %d", hw_addr_len); |
| 358 | else |
| 359 | { |
| 360 | ifp->hw_addr_len = hw_addr_len; |
| 361 | memcpy (ifp->hw_addr, RTA_DATA(tb[IFLA_ADDRESS]), hw_addr_len); |
| 362 | |
| 363 | for (i = 0; i < hw_addr_len; i++) |
| 364 | if (ifp->hw_addr[i] != 0) |
| 365 | break; |
| 366 | |
| 367 | if (i == hw_addr_len) |
| 368 | ifp->hw_addr_len = 0; |
| 369 | else |
| 370 | ifp->hw_addr_len = hw_addr_len; |
| 371 | } |
| 372 | } |
| 373 | |
| 374 | if_add_update (ifp); |
| 375 | |
| 376 | return 0; |
| 377 | } |
| 378 | |
| 379 | /* Lookup interface IPv4/IPv6 address. */ |
| 380 | int |
| 381 | netlink_interface_addr (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| 382 | { |
| 383 | int len; |
| 384 | struct ifaddrmsg *ifa; |
| 385 | struct rtattr *tb [IFA_MAX + 1]; |
| 386 | struct interface *ifp; |
| 387 | void *addr = NULL; |
| 388 | void *broad = NULL; |
| 389 | u_char flags = 0; |
| 390 | char *label = NULL; |
| 391 | |
| 392 | ifa = NLMSG_DATA (h); |
| 393 | |
| 394 | if (ifa->ifa_family != AF_INET |
| 395 | #ifdef HAVE_IPV6 |
| 396 | && ifa->ifa_family != AF_INET6 |
| 397 | #endif /* HAVE_IPV6 */ |
| 398 | ) |
| 399 | return 0; |
| 400 | |
| 401 | if (h->nlmsg_type != RTM_NEWADDR && h->nlmsg_type != RTM_DELADDR) |
| 402 | return 0; |
| 403 | |
| 404 | len = h->nlmsg_len - NLMSG_LENGTH(sizeof (struct ifaddrmsg)); |
| 405 | if (len < 0) |
| 406 | return -1; |
| 407 | |
| 408 | memset (tb, 0, sizeof tb); |
| 409 | netlink_parse_rtattr (tb, IFA_MAX, IFA_RTA (ifa), len); |
| 410 | |
| 411 | ifp = if_lookup_by_index (ifa->ifa_index); |
| 412 | if (ifp == NULL) |
| 413 | { |
| 414 | zlog_err ("netlink_interface_addr can't find interface by index %d", |
| 415 | ifa->ifa_index); |
| 416 | return -1; |
| 417 | } |
| 418 | |
| 419 | if (tb[IFA_ADDRESS] == NULL) |
| 420 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; |
| 421 | |
| 422 | if (ifp->flags & IFF_POINTOPOINT) |
| 423 | { |
| 424 | if (tb[IFA_LOCAL]) |
| 425 | { |
| 426 | addr = RTA_DATA (tb[IFA_LOCAL]); |
| 427 | if (tb[IFA_ADDRESS]) |
| 428 | broad = RTA_DATA (tb[IFA_ADDRESS]); |
| 429 | else |
| 430 | broad = NULL; |
| 431 | } |
| 432 | else |
| 433 | { |
| 434 | if (tb[IFA_ADDRESS]) |
| 435 | addr = RTA_DATA (tb[IFA_ADDRESS]); |
| 436 | else |
| 437 | addr = NULL; |
| 438 | } |
| 439 | } |
| 440 | else |
| 441 | { |
| 442 | if (tb[IFA_ADDRESS]) |
| 443 | addr = RTA_DATA (tb[IFA_ADDRESS]); |
| 444 | else |
| 445 | addr = NULL; |
| 446 | |
| 447 | if (tb[IFA_BROADCAST]) |
| 448 | broad = RTA_DATA(tb[IFA_BROADCAST]); |
| 449 | else |
| 450 | broad = NULL; |
| 451 | } |
| 452 | |
| 453 | /* Flags. */ |
| 454 | if (ifa->ifa_flags & IFA_F_SECONDARY) |
| 455 | SET_FLAG (flags, ZEBRA_IFA_SECONDARY); |
| 456 | |
| 457 | /* Label */ |
| 458 | if (tb[IFA_LABEL]) |
| 459 | label = (char *) RTA_DATA (tb[IFA_LABEL]); |
| 460 | |
| 461 | if (ifp && label && strcmp (ifp->name, label) == 0) |
| 462 | label = NULL; |
| 463 | |
| 464 | /* Register interface address to the interface. */ |
| 465 | if (ifa->ifa_family == AF_INET) |
| 466 | { |
| 467 | if (h->nlmsg_type == RTM_NEWADDR) |
| 468 | connected_add_ipv4 (ifp, flags, |
| 469 | (struct in_addr *) addr, ifa->ifa_prefixlen, |
| 470 | (struct in_addr *) broad, label); |
| 471 | else |
| 472 | connected_delete_ipv4 (ifp, flags, |
| 473 | (struct in_addr *) addr, ifa->ifa_prefixlen, |
| 474 | (struct in_addr *) broad, label); |
| 475 | } |
| 476 | #ifdef HAVE_IPV6 |
| 477 | if (ifa->ifa_family == AF_INET6) |
| 478 | { |
| 479 | if (h->nlmsg_type == RTM_NEWADDR) |
| 480 | connected_add_ipv6 (ifp, |
| 481 | (struct in6_addr *) addr, ifa->ifa_prefixlen, |
| 482 | (struct in6_addr *) broad); |
| 483 | else |
| 484 | connected_delete_ipv6 (ifp, |
| 485 | (struct in6_addr *) addr, ifa->ifa_prefixlen, |
| 486 | (struct in6_addr *) broad); |
| 487 | } |
| 488 | #endif /* HAVE_IPV6*/ |
| 489 | |
| 490 | return 0; |
| 491 | } |
| 492 | |
| 493 | /* Looking up routing table by netlink interface. */ |
| 494 | int |
| 495 | netlink_routing_table (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| 496 | { |
| 497 | int len; |
| 498 | struct rtmsg *rtm; |
| 499 | struct rtattr *tb [RTA_MAX + 1]; |
| 500 | u_char flags = 0; |
| 501 | |
| 502 | char anyaddr[16] = {0}; |
| 503 | |
| 504 | int index; |
| 505 | int table; |
| 506 | void *dest; |
| 507 | void *gate; |
| 508 | |
| 509 | rtm = NLMSG_DATA (h); |
| 510 | |
| 511 | if (h->nlmsg_type != RTM_NEWROUTE) |
| 512 | return 0; |
| 513 | if (rtm->rtm_type != RTN_UNICAST) |
| 514 | return 0; |
| 515 | |
| 516 | table = rtm->rtm_table; |
| 517 | #if 0 /* we weed them out later in rib_weed_tables () */ |
| 518 | if (table != RT_TABLE_MAIN && table != rtm_table_default) |
| 519 | return 0; |
| 520 | #endif |
| 521 | |
| 522 | len = h->nlmsg_len - NLMSG_LENGTH(sizeof (struct rtmsg)); |
| 523 | if (len < 0) |
| 524 | return -1; |
| 525 | |
| 526 | memset (tb, 0, sizeof tb); |
| 527 | netlink_parse_rtattr (tb, RTA_MAX, RTM_RTA (rtm), len); |
| 528 | |
| 529 | if (rtm->rtm_flags & RTM_F_CLONED) |
| 530 | return 0; |
| 531 | if (rtm->rtm_protocol == RTPROT_REDIRECT) |
| 532 | return 0; |
| 533 | if (rtm->rtm_protocol == RTPROT_KERNEL) |
| 534 | return 0; |
| 535 | |
| 536 | if (rtm->rtm_src_len != 0) |
| 537 | return 0; |
| 538 | |
| 539 | /* Route which inserted by Zebra. */ |
| 540 | if (rtm->rtm_protocol == RTPROT_ZEBRA) |
| 541 | flags |= ZEBRA_FLAG_SELFROUTE; |
| 542 | |
| 543 | index = 0; |
| 544 | dest = NULL; |
| 545 | gate = NULL; |
| 546 | |
| 547 | if (tb[RTA_OIF]) |
| 548 | index = *(int *) RTA_DATA (tb[RTA_OIF]); |
| 549 | |
| 550 | if (tb[RTA_DST]) |
| 551 | dest = RTA_DATA (tb[RTA_DST]); |
| 552 | else |
| 553 | dest = anyaddr; |
| 554 | |
| 555 | /* Multipath treatment is needed. */ |
| 556 | if (tb[RTA_GATEWAY]) |
| 557 | gate = RTA_DATA (tb[RTA_GATEWAY]); |
| 558 | |
| 559 | if (rtm->rtm_family == AF_INET) |
| 560 | { |
| 561 | struct prefix_ipv4 p; |
| 562 | p.family = AF_INET; |
| 563 | memcpy (&p.prefix, dest, 4); |
| 564 | p.prefixlen = rtm->rtm_dst_len; |
| 565 | |
| 566 | rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, flags, &p, gate, index, table, 0, 0); |
| 567 | } |
| 568 | #ifdef HAVE_IPV6 |
| 569 | if (rtm->rtm_family == AF_INET6) |
| 570 | { |
| 571 | struct prefix_ipv6 p; |
| 572 | p.family = AF_INET6; |
| 573 | memcpy (&p.prefix, dest, 16); |
| 574 | p.prefixlen = rtm->rtm_dst_len; |
| 575 | |
| 576 | rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, flags, &p, gate, index, table); |
| 577 | } |
| 578 | #endif /* HAVE_IPV6 */ |
| 579 | |
| 580 | return 0; |
| 581 | } |
| 582 | |
| 583 | struct message rtproto_str [] = |
| 584 | { |
| 585 | {RTPROT_REDIRECT, "redirect"}, |
| 586 | {RTPROT_KERNEL, "kernel"}, |
| 587 | {RTPROT_BOOT, "boot"}, |
| 588 | {RTPROT_STATIC, "static"}, |
| 589 | {RTPROT_GATED, "GateD"}, |
| 590 | {RTPROT_RA, "router advertisement"}, |
| 591 | {RTPROT_MRT, "MRT"}, |
| 592 | {RTPROT_ZEBRA, "Zebra"}, |
| 593 | #ifdef RTPROT_BIRD |
| 594 | {RTPROT_BIRD, "BIRD"}, |
| 595 | #endif /* RTPROT_BIRD */ |
| 596 | {0, NULL} |
| 597 | }; |
| 598 | |
| 599 | /* Routing information change from the kernel. */ |
| 600 | int |
| 601 | netlink_route_change (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| 602 | { |
| 603 | int len; |
| 604 | struct rtmsg *rtm; |
| 605 | struct rtattr *tb [RTA_MAX + 1]; |
| 606 | |
| 607 | char anyaddr[16] = {0}; |
| 608 | |
| 609 | int index; |
| 610 | int table; |
| 611 | void *dest; |
| 612 | void *gate; |
| 613 | |
| 614 | rtm = NLMSG_DATA (h); |
| 615 | |
| 616 | if (! (h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE)) |
| 617 | { |
| 618 | /* If this is not route add/delete message print warning. */ |
| 619 | zlog_warn ("Kernel message: %d\n", h->nlmsg_type); |
| 620 | return 0; |
| 621 | } |
| 622 | |
| 623 | /* Connected route. */ |
| 624 | if (IS_ZEBRA_DEBUG_KERNEL) |
| 625 | zlog_info ("%s %s %s proto %s", |
| 626 | h->nlmsg_type == RTM_NEWROUTE ? "RTM_NEWROUTE" : "RTM_DELROUTE", |
| 627 | rtm->rtm_family == AF_INET ? "ipv4" : "ipv6", |
| 628 | rtm->rtm_type == RTN_UNICAST ? "unicast" : "multicast", |
| 629 | lookup (rtproto_str, rtm->rtm_protocol)); |
| 630 | |
| 631 | if (rtm->rtm_type != RTN_UNICAST) |
| 632 | { |
| 633 | return 0; |
| 634 | } |
| 635 | |
| 636 | table = rtm->rtm_table; |
| 637 | if (table != RT_TABLE_MAIN && table != rtm_table_default) |
| 638 | { |
| 639 | return 0; |
| 640 | } |
| 641 | |
| 642 | len = h->nlmsg_len - NLMSG_LENGTH(sizeof (struct rtmsg)); |
| 643 | if (len < 0) |
| 644 | return -1; |
| 645 | |
| 646 | memset (tb, 0, sizeof tb); |
| 647 | netlink_parse_rtattr (tb, RTA_MAX, RTM_RTA (rtm), len); |
| 648 | |
| 649 | if (rtm->rtm_flags & RTM_F_CLONED) |
| 650 | return 0; |
| 651 | if (rtm->rtm_protocol == RTPROT_REDIRECT) |
| 652 | return 0; |
| 653 | if (rtm->rtm_protocol == RTPROT_KERNEL) |
| 654 | return 0; |
| 655 | |
| 656 | if (rtm->rtm_protocol == RTPROT_ZEBRA && h->nlmsg_type == RTM_NEWROUTE) |
| 657 | return 0; |
| 658 | |
| 659 | if (rtm->rtm_src_len != 0) |
| 660 | { |
| 661 | zlog_warn ("netlink_route_change(): no src len"); |
| 662 | return 0; |
| 663 | } |
| 664 | |
| 665 | index = 0; |
| 666 | dest = NULL; |
| 667 | gate = NULL; |
| 668 | |
| 669 | if (tb[RTA_OIF]) |
| 670 | index = *(int *) RTA_DATA (tb[RTA_OIF]); |
| 671 | |
| 672 | if (tb[RTA_DST]) |
| 673 | dest = RTA_DATA (tb[RTA_DST]); |
| 674 | else |
| 675 | dest = anyaddr; |
| 676 | |
| 677 | if (tb[RTA_GATEWAY]) |
| 678 | gate = RTA_DATA (tb[RTA_GATEWAY]); |
| 679 | |
| 680 | if (rtm->rtm_family == AF_INET) |
| 681 | { |
| 682 | struct prefix_ipv4 p; |
| 683 | p.family = AF_INET; |
| 684 | memcpy (&p.prefix, dest, 4); |
| 685 | p.prefixlen = rtm->rtm_dst_len; |
| 686 | |
| 687 | if (IS_ZEBRA_DEBUG_KERNEL) |
| 688 | { |
| 689 | if (h->nlmsg_type == RTM_NEWROUTE) |
| 690 | zlog_info ("RTM_NEWROUTE %s/%d", |
| 691 | inet_ntoa (p.prefix), p.prefixlen); |
| 692 | else |
| 693 | zlog_info ("RTM_DELROUTE %s/%d", |
| 694 | inet_ntoa (p.prefix), p.prefixlen); |
| 695 | } |
| 696 | |
| 697 | if (h->nlmsg_type == RTM_NEWROUTE) |
| 698 | rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, table, 0, 0); |
| 699 | else |
| 700 | rib_delete_ipv4 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, table); |
| 701 | } |
| 702 | |
| 703 | #ifdef HAVE_IPV6 |
| 704 | if (rtm->rtm_family == AF_INET6) |
| 705 | { |
| 706 | struct prefix_ipv6 p; |
| 707 | char buf[BUFSIZ]; |
| 708 | |
| 709 | p.family = AF_INET6; |
| 710 | memcpy (&p.prefix, dest, 16); |
| 711 | p.prefixlen = rtm->rtm_dst_len; |
| 712 | |
| 713 | if (IS_ZEBRA_DEBUG_KERNEL) |
| 714 | { |
| 715 | if (h->nlmsg_type == RTM_NEWROUTE) |
| 716 | zlog_info ("RTM_NEWROUTE %s/%d", |
| 717 | inet_ntop (AF_INET6, &p.prefix, buf, BUFSIZ), |
| 718 | p.prefixlen); |
| 719 | else |
| 720 | zlog_info ("RTM_DELROUTE %s/%d", |
| 721 | inet_ntop (AF_INET6, &p.prefix, buf, BUFSIZ), |
| 722 | p.prefixlen); |
| 723 | } |
| 724 | |
| 725 | if (h->nlmsg_type == RTM_NEWROUTE) |
| 726 | rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, 0); |
| 727 | else |
| 728 | rib_delete_ipv6 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, 0); |
| 729 | } |
| 730 | #endif /* HAVE_IPV6 */ |
| 731 | |
| 732 | return 0; |
| 733 | } |
| 734 | |
| 735 | int |
| 736 | netlink_link_change (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| 737 | { |
| 738 | int len; |
| 739 | struct ifinfomsg *ifi; |
| 740 | struct rtattr *tb [IFLA_MAX + 1]; |
| 741 | struct interface *ifp; |
| 742 | char *name; |
| 743 | |
| 744 | ifi = NLMSG_DATA (h); |
| 745 | |
| 746 | if (! (h->nlmsg_type == RTM_NEWLINK || h->nlmsg_type == RTM_DELLINK)) |
| 747 | { |
| 748 | /* If this is not link add/delete message so print warning. */ |
| 749 | zlog_warn ("netlink_link_change: wrong kernel message %d\n", |
| 750 | h->nlmsg_type); |
| 751 | return 0; |
| 752 | } |
| 753 | |
| 754 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct ifinfomsg)); |
| 755 | if (len < 0) |
| 756 | return -1; |
| 757 | |
| 758 | /* Looking up interface name. */ |
| 759 | memset (tb, 0, sizeof tb); |
| 760 | netlink_parse_rtattr (tb, IFLA_MAX, IFLA_RTA (ifi), len); |
| 761 | if (tb[IFLA_IFNAME] == NULL) |
| 762 | return -1; |
| 763 | name = (char *)RTA_DATA(tb[IFLA_IFNAME]); |
| 764 | |
| 765 | /* Add interface. */ |
| 766 | if (h->nlmsg_type == RTM_NEWLINK) |
| 767 | { |
| 768 | ifp = if_lookup_by_name (name); |
| 769 | |
| 770 | if (ifp == NULL || ! CHECK_FLAG (ifp->status, ZEBRA_INTERFACE_ACTIVE)) |
| 771 | { |
| 772 | if (ifp == NULL) |
| 773 | ifp = if_get_by_name (name); |
| 774 | |
| 775 | ifp->ifindex = ifi->ifi_index; |
| 776 | ifp->flags = ifi->ifi_flags & 0x0000fffff; |
| 777 | ifp->mtu = *(int *)RTA_DATA (tb[IFLA_MTU]); |
| 778 | ifp->metric = 1; |
| 779 | |
| 780 | /* If new link is added. */ |
| 781 | if_add_update(ifp); |
| 782 | } |
| 783 | else |
| 784 | { |
| 785 | /* Interface status change. */ |
| 786 | ifp->ifindex = ifi->ifi_index; |
| 787 | ifp->mtu = *(int *)RTA_DATA (tb[IFLA_MTU]); |
| 788 | ifp->metric = 1; |
| 789 | |
| 790 | if (if_is_up (ifp)) |
| 791 | { |
| 792 | ifp->flags = ifi->ifi_flags & 0x0000fffff; |
| 793 | if (! if_is_up (ifp)) |
| 794 | if_down (ifp); |
| 795 | } |
| 796 | else |
| 797 | { |
| 798 | ifp->flags = ifi->ifi_flags & 0x0000fffff; |
| 799 | if (if_is_up (ifp)) |
| 800 | if_up (ifp); |
| 801 | } |
| 802 | } |
| 803 | } |
| 804 | else |
| 805 | { |
| 806 | /* RTM_DELLINK. */ |
| 807 | ifp = if_lookup_by_name (name); |
| 808 | |
| 809 | if (ifp == NULL) |
| 810 | { |
| 811 | zlog (NULL, LOG_WARNING, "interface %s is deleted but can't find", |
| 812 | name); |
| 813 | return 0; |
| 814 | } |
| 815 | |
| 816 | if_delete_update (ifp); |
| 817 | } |
| 818 | |
| 819 | return 0; |
| 820 | } |
| 821 | |
| 822 | int |
| 823 | netlink_information_fetch (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| 824 | { |
| 825 | switch (h->nlmsg_type) |
| 826 | { |
| 827 | case RTM_NEWROUTE: |
| 828 | return netlink_route_change (snl, h); |
| 829 | break; |
| 830 | case RTM_DELROUTE: |
| 831 | return netlink_route_change (snl, h); |
| 832 | break; |
| 833 | case RTM_NEWLINK: |
| 834 | return netlink_link_change (snl, h); |
| 835 | break; |
| 836 | case RTM_DELLINK: |
| 837 | return netlink_link_change (snl, h); |
| 838 | break; |
| 839 | case RTM_NEWADDR: |
| 840 | return netlink_interface_addr (snl, h); |
| 841 | break; |
| 842 | case RTM_DELADDR: |
| 843 | return netlink_interface_addr (snl, h); |
| 844 | break; |
| 845 | default: |
| 846 | zlog_warn ("Unknown netlink nlmsg_type %d\n", h->nlmsg_type); |
| 847 | break; |
| 848 | } |
| 849 | return 0; |
| 850 | } |
| 851 | |
| 852 | /* Interface lookup by netlink socket. */ |
| 853 | int |
| 854 | interface_lookup_netlink () |
| 855 | { |
| 856 | int ret; |
| 857 | |
| 858 | /* Get interface information. */ |
| 859 | ret = netlink_request (AF_PACKET, RTM_GETLINK, &netlink_cmd); |
| 860 | if (ret < 0) |
| 861 | return ret; |
| 862 | ret = netlink_parse_info (netlink_interface, &netlink_cmd); |
| 863 | if (ret < 0) |
| 864 | return ret; |
| 865 | |
| 866 | /* Get IPv4 address of the interfaces. */ |
| 867 | ret = netlink_request (AF_INET, RTM_GETADDR, &netlink_cmd); |
| 868 | if (ret < 0) |
| 869 | return ret; |
| 870 | ret = netlink_parse_info (netlink_interface_addr, &netlink_cmd); |
| 871 | if (ret < 0) |
| 872 | return ret; |
| 873 | |
| 874 | #ifdef HAVE_IPV6 |
| 875 | /* Get IPv6 address of the interfaces. */ |
| 876 | ret = netlink_request (AF_INET6, RTM_GETADDR, &netlink_cmd); |
| 877 | if (ret < 0) |
| 878 | return ret; |
| 879 | ret = netlink_parse_info (netlink_interface_addr, &netlink_cmd); |
| 880 | if (ret < 0) |
| 881 | return ret; |
| 882 | #endif /* HAVE_IPV6 */ |
| 883 | |
| 884 | return 0; |
| 885 | } |
| 886 | |
| 887 | /* Routing table read function using netlink interface. Only called |
| 888 | bootstrap time. */ |
| 889 | int |
| 890 | netlink_route_read () |
| 891 | { |
| 892 | int ret; |
| 893 | |
| 894 | /* Get IPv4 routing table. */ |
| 895 | ret = netlink_request (AF_INET, RTM_GETROUTE, &netlink_cmd); |
| 896 | if (ret < 0) |
| 897 | return ret; |
| 898 | ret = netlink_parse_info (netlink_routing_table, &netlink_cmd); |
| 899 | if (ret < 0) |
| 900 | return ret; |
| 901 | |
| 902 | #ifdef HAVE_IPV6 |
| 903 | /* Get IPv6 routing table. */ |
| 904 | ret = netlink_request (AF_INET6, RTM_GETROUTE, &netlink_cmd); |
| 905 | if (ret < 0) |
| 906 | return ret; |
| 907 | ret = netlink_parse_info (netlink_routing_table, &netlink_cmd); |
| 908 | if (ret < 0) |
| 909 | return ret; |
| 910 | #endif /* HAVE_IPV6 */ |
| 911 | |
| 912 | return 0; |
| 913 | } |
| 914 | |
| 915 | /* Utility function comes from iproute2. |
| 916 | Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> */ |
| 917 | int |
| 918 | addattr_l (struct nlmsghdr *n, int maxlen, int type, void *data, int alen) |
| 919 | { |
| 920 | int len; |
| 921 | struct rtattr *rta; |
| 922 | |
| 923 | len = RTA_LENGTH(alen); |
| 924 | |
| 925 | if (NLMSG_ALIGN(n->nlmsg_len) + len > maxlen) |
| 926 | return -1; |
| 927 | |
| 928 | rta = (struct rtattr*) (((char*)n) + NLMSG_ALIGN (n->nlmsg_len)); |
| 929 | rta->rta_type = type; |
| 930 | rta->rta_len = len; |
| 931 | memcpy (RTA_DATA(rta), data, alen); |
| 932 | n->nlmsg_len = NLMSG_ALIGN (n->nlmsg_len) + len; |
| 933 | |
| 934 | return 0; |
| 935 | } |
| 936 | |
| 937 | int |
| 938 | rta_addattr_l (struct rtattr *rta, int maxlen, int type, void *data, int alen) |
| 939 | { |
| 940 | int len; |
| 941 | struct rtattr *subrta; |
| 942 | |
| 943 | len = RTA_LENGTH(alen); |
| 944 | |
| 945 | if (RTA_ALIGN(rta->rta_len) + len > maxlen) |
| 946 | return -1; |
| 947 | |
| 948 | subrta = (struct rtattr*) (((char*)rta) + RTA_ALIGN (rta->rta_len)); |
| 949 | subrta->rta_type = type; |
| 950 | subrta->rta_len = len; |
| 951 | memcpy (RTA_DATA(subrta), data, alen); |
| 952 | rta->rta_len = NLMSG_ALIGN (rta->rta_len) + len; |
| 953 | |
| 954 | return 0; |
| 955 | } |
| 956 | |
| 957 | /* Utility function comes from iproute2. |
| 958 | Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> */ |
| 959 | int |
| 960 | addattr32 (struct nlmsghdr *n, int maxlen, int type, int data) |
| 961 | { |
| 962 | int len; |
| 963 | struct rtattr *rta; |
| 964 | |
| 965 | len = RTA_LENGTH(4); |
| 966 | |
| 967 | if (NLMSG_ALIGN (n->nlmsg_len) + len > maxlen) |
| 968 | return -1; |
| 969 | |
| 970 | rta = (struct rtattr*) (((char*)n) + NLMSG_ALIGN (n->nlmsg_len)); |
| 971 | rta->rta_type = type; |
| 972 | rta->rta_len = len; |
| 973 | memcpy (RTA_DATA(rta), &data, 4); |
| 974 | n->nlmsg_len = NLMSG_ALIGN (n->nlmsg_len) + len; |
| 975 | |
| 976 | return 0; |
| 977 | } |
| 978 | |
| 979 | static int |
| 980 | netlink_talk_filter (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| 981 | { |
| 982 | zlog_warn ("netlink_talk: ignoring message type 0x%04x", h->nlmsg_type); |
| 983 | return 0; |
| 984 | } |
| 985 | |
| 986 | /* sendmsg() to netlink socket then recvmsg(). */ |
| 987 | int |
| 988 | netlink_talk (struct nlmsghdr *n, struct nlsock *nl) |
| 989 | { |
| 990 | int status; |
| 991 | struct sockaddr_nl snl; |
| 992 | struct iovec iov = { (void*) n, n->nlmsg_len }; |
| 993 | struct msghdr msg = {(void*) &snl, sizeof snl, &iov, 1, NULL, 0, 0}; |
| 994 | int flags = 0; |
| 995 | |
| 996 | memset (&snl, 0, sizeof snl); |
| 997 | snl.nl_family = AF_NETLINK; |
| 998 | |
| 999 | n->nlmsg_seq = ++netlink_cmd.seq; |
| 1000 | |
| 1001 | /* Request an acknowledgement by setting NLM_F_ACK */ |
| 1002 | n->nlmsg_flags |= NLM_F_ACK; |
| 1003 | |
| 1004 | if (IS_ZEBRA_DEBUG_KERNEL) |
| 1005 | zlog_info ("netlink_talk: %s type %s(%u), seq=%u", netlink_cmd.name, |
| 1006 | lookup (nlmsg_str, n->nlmsg_type), n->nlmsg_type, |
| 1007 | n->nlmsg_seq); |
| 1008 | |
| 1009 | /* Send message to netlink interface. */ |
| 1010 | status = sendmsg (nl->sock, &msg, 0); |
| 1011 | if (status < 0) |
| 1012 | { |
| 1013 | zlog (NULL, LOG_ERR, "netlink_talk sendmsg() error: %s", |
| 1014 | strerror (errno)); |
| 1015 | return -1; |
| 1016 | } |
| 1017 | |
| 1018 | /* |
| 1019 | * Change socket flags for blocking I/O. |
| 1020 | * This ensures we wait for a reply in netlink_parse_info(). |
| 1021 | */ |
| 1022 | if((flags = fcntl(nl->sock, F_GETFL, 0)) < 0) |
| 1023 | { |
| 1024 | zlog (NULL, LOG_ERR, "%s:%i F_GETFL error: %s", |
| 1025 | __FUNCTION__, __LINE__, strerror (errno)); |
| 1026 | } |
| 1027 | flags &= ~O_NONBLOCK; |
| 1028 | if(fcntl(nl->sock, F_SETFL, flags) < 0) |
| 1029 | { |
| 1030 | zlog (NULL, LOG_ERR, "%s:%i F_SETFL error: %s", |
| 1031 | __FUNCTION__, __LINE__, strerror (errno)); |
| 1032 | } |
| 1033 | |
| 1034 | /* |
| 1035 | * Get reply from netlink socket. |
| 1036 | * The reply should either be an acknowlegement or an error. |
| 1037 | */ |
| 1038 | status = netlink_parse_info (netlink_talk_filter, nl); |
| 1039 | |
| 1040 | /* Restore socket flags for nonblocking I/O */ |
| 1041 | flags |= O_NONBLOCK; |
| 1042 | if(fcntl(nl->sock, F_SETFL, flags) < 0) |
| 1043 | { |
| 1044 | zlog (NULL, LOG_ERR, "%s:%i F_SETFL error: %s", |
| 1045 | __FUNCTION__, __LINE__, strerror (errno)); |
| 1046 | } |
| 1047 | |
| 1048 | return status; |
| 1049 | } |
| 1050 | |
| 1051 | /* Routing table change via netlink interface. */ |
| 1052 | int |
| 1053 | netlink_route (int cmd, int family, void *dest, int length, void *gate, |
| 1054 | int index, int zebra_flags, int table) |
| 1055 | { |
| 1056 | int ret; |
| 1057 | int bytelen; |
| 1058 | struct sockaddr_nl snl; |
| 1059 | int discard; |
| 1060 | |
| 1061 | struct |
| 1062 | { |
| 1063 | struct nlmsghdr n; |
| 1064 | struct rtmsg r; |
| 1065 | char buf[1024]; |
| 1066 | } req; |
| 1067 | |
| 1068 | memset (&req, 0, sizeof req); |
| 1069 | |
| 1070 | bytelen = (family == AF_INET ? 4 : 16); |
| 1071 | |
| 1072 | req.n.nlmsg_len = NLMSG_LENGTH (sizeof (struct rtmsg)); |
| 1073 | req.n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST; |
| 1074 | req.n.nlmsg_type = cmd; |
| 1075 | req.r.rtm_family = family; |
| 1076 | req.r.rtm_table = table; |
| 1077 | req.r.rtm_dst_len = length; |
| 1078 | |
| 1079 | if (zebra_flags & ZEBRA_FLAG_BLACKHOLE) |
| 1080 | discard = 1; |
| 1081 | else |
| 1082 | discard = 0; |
| 1083 | |
| 1084 | if (cmd == RTM_NEWROUTE) |
| 1085 | { |
| 1086 | req.r.rtm_protocol = RTPROT_ZEBRA; |
| 1087 | req.r.rtm_scope = RT_SCOPE_UNIVERSE; |
| 1088 | |
| 1089 | if (discard) |
| 1090 | req.r.rtm_type = RTN_BLACKHOLE; |
| 1091 | else |
| 1092 | req.r.rtm_type = RTN_UNICAST; |
| 1093 | } |
| 1094 | |
| 1095 | if (dest) |
| 1096 | addattr_l (&req.n, sizeof req, RTA_DST, dest, bytelen); |
| 1097 | |
| 1098 | if (! discard) |
| 1099 | { |
| 1100 | if (gate) |
| 1101 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, gate, bytelen); |
| 1102 | if (index > 0) |
| 1103 | addattr32 (&req.n, sizeof req, RTA_OIF, index); |
| 1104 | } |
| 1105 | |
| 1106 | /* Destination netlink address. */ |
| 1107 | memset (&snl, 0, sizeof snl); |
| 1108 | snl.nl_family = AF_NETLINK; |
| 1109 | |
| 1110 | /* Talk to netlink socket. */ |
| 1111 | ret = netlink_talk (&req.n, &netlink); |
| 1112 | if (ret < 0) |
| 1113 | return -1; |
| 1114 | |
| 1115 | return 0; |
| 1116 | } |
| 1117 | |
| 1118 | /* Routing table change via netlink interface. */ |
| 1119 | int |
| 1120 | netlink_route_multipath (int cmd, struct prefix *p, struct rib *rib, |
| 1121 | int family) |
| 1122 | { |
| 1123 | int bytelen; |
| 1124 | struct sockaddr_nl snl; |
| 1125 | struct nexthop *nexthop = NULL; |
| 1126 | int nexthop_num = 0; |
| 1127 | struct nlsock *nl; |
| 1128 | int discard; |
| 1129 | |
| 1130 | struct |
| 1131 | { |
| 1132 | struct nlmsghdr n; |
| 1133 | struct rtmsg r; |
| 1134 | char buf[1024]; |
| 1135 | } req; |
| 1136 | |
| 1137 | memset (&req, 0, sizeof req); |
| 1138 | |
| 1139 | bytelen = (family == AF_INET ? 4 : 16); |
| 1140 | |
| 1141 | req.n.nlmsg_len = NLMSG_LENGTH (sizeof (struct rtmsg)); |
| 1142 | req.n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST; |
| 1143 | req.n.nlmsg_type = cmd; |
| 1144 | req.r.rtm_family = family; |
| 1145 | req.r.rtm_table = rib->table; |
| 1146 | req.r.rtm_dst_len = p->prefixlen; |
| 1147 | |
| 1148 | if (rib->flags & ZEBRA_FLAG_BLACKHOLE) |
| 1149 | discard = 1; |
| 1150 | else |
| 1151 | discard = 0; |
| 1152 | |
| 1153 | if (cmd == RTM_NEWROUTE) |
| 1154 | { |
| 1155 | req.r.rtm_protocol = RTPROT_ZEBRA; |
| 1156 | req.r.rtm_scope = RT_SCOPE_UNIVERSE; |
| 1157 | |
| 1158 | if (discard) |
| 1159 | req.r.rtm_type = RTN_BLACKHOLE; |
| 1160 | else |
| 1161 | req.r.rtm_type = RTN_UNICAST; |
| 1162 | } |
| 1163 | |
| 1164 | addattr_l (&req.n, sizeof req, RTA_DST, &p->u.prefix, bytelen); |
| 1165 | |
| 1166 | /* Metric. */ |
| 1167 | addattr32 (&req.n, sizeof req, RTA_PRIORITY, rib->metric); |
| 1168 | |
| 1169 | if (discard) |
| 1170 | { |
| 1171 | if (cmd == RTM_NEWROUTE) |
| 1172 | for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next) |
| 1173 | SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB); |
| 1174 | goto skip; |
| 1175 | } |
| 1176 | |
| 1177 | /* Multipath case. */ |
| 1178 | if (rib->nexthop_active_num == 1 || MULTIPATH_NUM == 1) |
| 1179 | { |
| 1180 | for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next) |
| 1181 | { |
| 1182 | if ((cmd == RTM_NEWROUTE |
| 1183 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE)) |
| 1184 | || (cmd == RTM_DELROUTE |
| 1185 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB))) |
| 1186 | { |
| 1187 | if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE)) |
| 1188 | { |
| 1189 | if (nexthop->rtype == NEXTHOP_TYPE_IPV4 |
| 1190 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX) |
| 1191 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, |
| 1192 | &nexthop->rgate.ipv4, bytelen); |
| 1193 | #ifdef HAVE_IPV6 |
| 1194 | if (nexthop->rtype == NEXTHOP_TYPE_IPV6 |
| 1195 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX |
| 1196 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME) |
| 1197 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, |
| 1198 | &nexthop->rgate.ipv6, bytelen); |
| 1199 | #endif /* HAVE_IPV6 */ |
| 1200 | if (nexthop->rtype == NEXTHOP_TYPE_IFINDEX |
| 1201 | || nexthop->rtype == NEXTHOP_TYPE_IFNAME |
| 1202 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX |
| 1203 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX |
| 1204 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME) |
| 1205 | addattr32 (&req.n, sizeof req, RTA_OIF, |
| 1206 | nexthop->rifindex); |
| 1207 | } |
| 1208 | else |
| 1209 | { |
| 1210 | if (nexthop->type == NEXTHOP_TYPE_IPV4 |
| 1211 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) |
| 1212 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, |
| 1213 | &nexthop->gate.ipv4, bytelen); |
| 1214 | #ifdef HAVE_IPV6 |
| 1215 | if (nexthop->type == NEXTHOP_TYPE_IPV6 |
| 1216 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME |
| 1217 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) |
| 1218 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, |
| 1219 | &nexthop->gate.ipv6, bytelen); |
| 1220 | #endif /* HAVE_IPV6 */ |
| 1221 | if (nexthop->type == NEXTHOP_TYPE_IFINDEX |
| 1222 | || nexthop->type == NEXTHOP_TYPE_IFNAME |
| 1223 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX |
| 1224 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX |
| 1225 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME) |
| 1226 | addattr32 (&req.n, sizeof req, RTA_OIF, nexthop->ifindex); |
| 1227 | } |
| 1228 | |
| 1229 | if (cmd == RTM_NEWROUTE) |
| 1230 | SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB); |
| 1231 | |
| 1232 | nexthop_num++; |
| 1233 | break; |
| 1234 | } |
| 1235 | } |
| 1236 | } |
| 1237 | else |
| 1238 | { |
| 1239 | char buf[1024]; |
| 1240 | struct rtattr *rta = (void *) buf; |
| 1241 | struct rtnexthop *rtnh; |
| 1242 | |
| 1243 | rta->rta_type = RTA_MULTIPATH; |
| 1244 | rta->rta_len = RTA_LENGTH(0); |
| 1245 | rtnh = RTA_DATA(rta); |
| 1246 | |
| 1247 | nexthop_num = 0; |
| 1248 | for (nexthop = rib->nexthop; |
| 1249 | nexthop && (MULTIPATH_NUM == 0 || nexthop_num < MULTIPATH_NUM); |
| 1250 | nexthop = nexthop->next) |
| 1251 | { |
| 1252 | if ((cmd == RTM_NEWROUTE |
| 1253 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE)) |
| 1254 | || (cmd == RTM_DELROUTE |
| 1255 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB))) |
| 1256 | { |
| 1257 | nexthop_num++; |
| 1258 | |
| 1259 | rtnh->rtnh_len = sizeof (*rtnh); |
| 1260 | rtnh->rtnh_flags = 0; |
| 1261 | rtnh->rtnh_hops = 0; |
| 1262 | rta->rta_len += rtnh->rtnh_len; |
| 1263 | |
| 1264 | if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE)) |
| 1265 | { |
| 1266 | if (nexthop->rtype == NEXTHOP_TYPE_IPV4 |
| 1267 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX) |
| 1268 | { |
| 1269 | rta_addattr_l (rta, 4096, RTA_GATEWAY, |
| 1270 | &nexthop->rgate.ipv4, bytelen); |
| 1271 | rtnh->rtnh_len += sizeof (struct rtattr) + 4; |
| 1272 | } |
| 1273 | #ifdef HAVE_IPV6 |
| 1274 | if (nexthop->rtype == NEXTHOP_TYPE_IPV6 |
| 1275 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME |
| 1276 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX) |
| 1277 | rta_addattr_l (rta, 4096, RTA_GATEWAY, |
| 1278 | &nexthop->rgate.ipv6, bytelen); |
| 1279 | #endif /* HAVE_IPV6 */ |
| 1280 | /* ifindex */ |
| 1281 | if (nexthop->rtype == NEXTHOP_TYPE_IFINDEX |
| 1282 | || nexthop->rtype == NEXTHOP_TYPE_IFNAME |
| 1283 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX |
| 1284 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX |
| 1285 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME) |
| 1286 | rtnh->rtnh_ifindex = nexthop->rifindex; |
| 1287 | else |
| 1288 | rtnh->rtnh_ifindex = 0; |
| 1289 | } |
| 1290 | else |
| 1291 | { |
| 1292 | if (nexthop->type == NEXTHOP_TYPE_IPV4 |
| 1293 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) |
| 1294 | { |
| 1295 | rta_addattr_l (rta, 4096, RTA_GATEWAY, |
| 1296 | &nexthop->gate.ipv4, bytelen); |
| 1297 | rtnh->rtnh_len += sizeof (struct rtattr) + 4; |
| 1298 | } |
| 1299 | #ifdef HAVE_IPV6 |
| 1300 | if (nexthop->type == NEXTHOP_TYPE_IPV6 |
| 1301 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME |
| 1302 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) |
| 1303 | rta_addattr_l (rta, 4096, RTA_GATEWAY, |
| 1304 | &nexthop->gate.ipv6, bytelen); |
| 1305 | #endif /* HAVE_IPV6 */ |
| 1306 | /* ifindex */ |
| 1307 | if (nexthop->type == NEXTHOP_TYPE_IFINDEX |
| 1308 | || nexthop->type == NEXTHOP_TYPE_IFNAME |
| 1309 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX |
| 1310 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME |
| 1311 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) |
| 1312 | rtnh->rtnh_ifindex = nexthop->ifindex; |
| 1313 | else |
| 1314 | rtnh->rtnh_ifindex = 0; |
| 1315 | } |
| 1316 | rtnh = RTNH_NEXT(rtnh); |
| 1317 | |
| 1318 | if (cmd == RTM_NEWROUTE) |
| 1319 | SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB); |
| 1320 | } |
| 1321 | } |
| 1322 | |
| 1323 | if (rta->rta_len > RTA_LENGTH (0)) |
| 1324 | addattr_l (&req.n, 1024, RTA_MULTIPATH, RTA_DATA(rta), |
| 1325 | RTA_PAYLOAD(rta)); |
| 1326 | } |
| 1327 | |
| 1328 | /* If there is no useful nexthop then return. */ |
| 1329 | if (nexthop_num == 0) |
| 1330 | { |
| 1331 | if (IS_ZEBRA_DEBUG_KERNEL) |
| 1332 | zlog_info ("netlink_route_multipath(): No useful nexthop."); |
| 1333 | return 0; |
| 1334 | } |
| 1335 | |
| 1336 | skip: |
| 1337 | |
| 1338 | /* Destination netlink address. */ |
| 1339 | memset (&snl, 0, sizeof snl); |
| 1340 | snl.nl_family = AF_NETLINK; |
| 1341 | |
| 1342 | if (family == AF_INET) |
| 1343 | nl = &netlink_cmd; |
| 1344 | else |
| 1345 | nl = &netlink; |
| 1346 | |
| 1347 | /* Talk to netlink socket. */ |
| 1348 | return netlink_talk (&req.n, nl); |
| 1349 | } |
| 1350 | |
| 1351 | int |
| 1352 | kernel_add_ipv4 (struct prefix *p, struct rib *rib) |
| 1353 | { |
| 1354 | return netlink_route_multipath (RTM_NEWROUTE, p, rib, AF_INET); |
| 1355 | } |
| 1356 | |
| 1357 | int |
| 1358 | kernel_delete_ipv4 (struct prefix *p, struct rib *rib) |
| 1359 | { |
| 1360 | return netlink_route_multipath (RTM_DELROUTE, p, rib, AF_INET); |
| 1361 | } |
| 1362 | |
| 1363 | #ifdef HAVE_IPV6 |
| 1364 | int |
| 1365 | kernel_add_ipv6 (struct prefix *p, struct rib *rib) |
| 1366 | { |
| 1367 | return netlink_route_multipath (RTM_NEWROUTE, p, rib, AF_INET6); |
| 1368 | } |
| 1369 | |
| 1370 | int |
| 1371 | kernel_delete_ipv6 (struct prefix *p, struct rib *rib) |
| 1372 | { |
| 1373 | return netlink_route_multipath (RTM_DELROUTE, p, rib, AF_INET6); |
| 1374 | } |
| 1375 | |
| 1376 | /* Delete IPv6 route from the kernel. */ |
| 1377 | int |
| 1378 | kernel_delete_ipv6_old (struct prefix_ipv6 *dest, struct in6_addr *gate, |
| 1379 | int index, int flags, int table) |
| 1380 | { |
| 1381 | return netlink_route (RTM_DELROUTE, AF_INET6, &dest->prefix, dest->prefixlen, |
| 1382 | gate, index, flags, table); |
| 1383 | } |
| 1384 | #endif /* HAVE_IPV6 */ |
| 1385 | \f |
| 1386 | /* Interface address modification. */ |
| 1387 | int |
| 1388 | netlink_address (int cmd, int family, struct interface *ifp, |
| 1389 | struct connected *ifc) |
| 1390 | { |
| 1391 | int bytelen; |
| 1392 | struct prefix *p; |
| 1393 | |
| 1394 | struct |
| 1395 | { |
| 1396 | struct nlmsghdr n; |
| 1397 | struct ifaddrmsg ifa; |
| 1398 | char buf[1024]; |
| 1399 | } req; |
| 1400 | |
| 1401 | p = ifc->address; |
| 1402 | memset (&req, 0, sizeof req); |
| 1403 | |
| 1404 | bytelen = (family == AF_INET ? 4 : 16); |
| 1405 | |
| 1406 | req.n.nlmsg_len = NLMSG_LENGTH (sizeof(struct ifaddrmsg)); |
| 1407 | req.n.nlmsg_flags = NLM_F_REQUEST; |
| 1408 | req.n.nlmsg_type = cmd; |
| 1409 | req.ifa.ifa_family = family; |
| 1410 | |
| 1411 | req.ifa.ifa_index = ifp->ifindex; |
| 1412 | req.ifa.ifa_prefixlen = p->prefixlen; |
| 1413 | |
| 1414 | addattr_l (&req.n, sizeof req, IFA_LOCAL, &p->u.prefix, bytelen); |
| 1415 | |
| 1416 | if (family == AF_INET && cmd == RTM_NEWADDR) |
| 1417 | { |
| 1418 | if (if_is_broadcast (ifp) && ifc->destination) |
| 1419 | { |
| 1420 | p = ifc->destination; |
| 1421 | addattr_l(&req.n, sizeof req, IFA_BROADCAST, &p->u.prefix, bytelen); |
| 1422 | } |
| 1423 | } |
| 1424 | |
| 1425 | if (CHECK_FLAG (ifc->flags, ZEBRA_IFA_SECONDARY)) |
| 1426 | SET_FLAG (req.ifa.ifa_flags, IFA_F_SECONDARY); |
| 1427 | |
| 1428 | if (ifc->label) |
| 1429 | addattr_l (&req.n, sizeof req, IFA_LABEL, ifc->label, |
| 1430 | strlen (ifc->label) + 1); |
| 1431 | |
| 1432 | return netlink_talk (&req.n, &netlink_cmd); |
| 1433 | } |
| 1434 | |
| 1435 | int |
| 1436 | kernel_address_add_ipv4 (struct interface *ifp, struct connected *ifc) |
| 1437 | { |
| 1438 | return netlink_address (RTM_NEWADDR, AF_INET, ifp, ifc); |
| 1439 | } |
| 1440 | |
| 1441 | int |
| 1442 | kernel_address_delete_ipv4 (struct interface *ifp, struct connected *ifc) |
| 1443 | { |
| 1444 | return netlink_address (RTM_DELADDR, AF_INET, ifp, ifc); |
| 1445 | } |
| 1446 | |
| 1447 | #include "thread.h" |
| 1448 | |
| 1449 | extern struct thread_master *master; |
| 1450 | |
| 1451 | /* Kernel route reflection. */ |
| 1452 | int |
| 1453 | kernel_read (struct thread *thread) |
| 1454 | { |
| 1455 | int ret; |
| 1456 | int sock; |
| 1457 | |
| 1458 | sock = THREAD_FD (thread); |
| 1459 | ret = netlink_parse_info (netlink_information_fetch, &netlink); |
| 1460 | thread_add_read (master, kernel_read, NULL, netlink.sock); |
| 1461 | |
| 1462 | return 0; |
| 1463 | } |
| 1464 | |
| 1465 | /* Exported interface function. This function simply calls |
| 1466 | netlink_socket (). */ |
| 1467 | void |
| 1468 | kernel_init () |
| 1469 | { |
| 1470 | unsigned long groups; |
| 1471 | |
| 1472 | groups = RTMGRP_LINK|RTMGRP_IPV4_ROUTE|RTMGRP_IPV4_IFADDR; |
| 1473 | #ifdef HAVE_IPV6 |
| 1474 | groups |= RTMGRP_IPV6_ROUTE|RTMGRP_IPV6_IFADDR; |
| 1475 | #endif /* HAVE_IPV6 */ |
| 1476 | netlink_socket (&netlink, groups); |
| 1477 | netlink_socket (&netlink_cmd, 0); |
| 1478 | |
| 1479 | /* Register kernel socket. */ |
| 1480 | if (netlink.sock > 0) |
| 1481 | thread_add_read (master, kernel_read, NULL, netlink.sock); |
| 1482 | } |
projects / mirror_frr.git / blame