| 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" |
| e04ab74d |
36 | #include "thread.h" |
| edd7c245 |
37 | #include "privs.h" |
| 718e3744 |
38 | |
| 39 | #include "zebra/zserv.h" |
| 40 | #include "zebra/redistribute.h" |
| 41 | #include "zebra/interface.h" |
| 42 | #include "zebra/debug.h" |
| 43 | |
| 44 | /* Socket interface to kernel */ |
| 45 | struct nlsock |
| 46 | { |
| 47 | int sock; |
| 48 | int seq; |
| 49 | struct sockaddr_nl snl; |
| 50 | char *name; |
| 51 | } netlink = { -1, 0, {0}, "netlink-listen" }, /* kernel messages */ |
| 52 | netlink_cmd = { -1, 0, {0}, "netlink-cmd" }, /* command channel */ |
| 53 | netlink_addr = {-1, 0, {0}, "netlink-addr" }; /* address channel */ |
| 54 | |
| 55 | struct message nlmsg_str[] = |
| 56 | { |
| 57 | {RTM_NEWROUTE, "RTM_NEWROUTE"}, |
| 58 | {RTM_DELROUTE, "RTM_DELROUTE"}, |
| 59 | {RTM_GETROUTE, "RTM_GETROUTE"}, |
| 60 | {RTM_NEWLINK, "RTM_NEWLINK"}, |
| 61 | {RTM_DELLINK, "RTM_DELLINK"}, |
| 62 | {RTM_GETLINK, "RTM_GETLINK"}, |
| 63 | {RTM_NEWADDR, "RTM_NEWADDR"}, |
| 64 | {RTM_DELADDR, "RTM_DELADDR"}, |
| 65 | {RTM_GETADDR, "RTM_GETADDR"}, |
| 66 | {0, NULL} |
| 67 | }; |
| 68 | |
| 69 | extern int rtm_table_default; |
| 70 | |
| edd7c245 |
71 | extern struct zebra_privs_t zserv_privs; |
| 72 | |
| 718e3744 |
73 | /* Make socket for Linux netlink interface. */ |
| 74 | static int |
| 75 | netlink_socket (struct nlsock *nl, unsigned long groups) |
| 76 | { |
| 77 | int ret; |
| 78 | struct sockaddr_nl snl; |
| 79 | int sock; |
| 80 | int namelen; |
| 81 | |
| 82 | sock = socket (AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); |
| 83 | if (sock < 0) |
| 84 | { |
| 85 | zlog (NULL, LOG_ERR, "Can't open %s socket: %s", nl->name, |
| 86 | strerror (errno)); |
| 87 | return -1; |
| 88 | } |
| 89 | |
| 90 | ret = fcntl (sock, F_SETFL, O_NONBLOCK); |
| 91 | if (ret < 0) |
| 92 | { |
| 93 | zlog (NULL, LOG_ERR, "Can't set %s socket flags: %s", nl->name, |
| 94 | strerror (errno)); |
| 95 | close (sock); |
| 96 | return -1; |
| 97 | } |
| 98 | |
| 99 | memset (&snl, 0, sizeof snl); |
| 100 | snl.nl_family = AF_NETLINK; |
| 101 | snl.nl_groups = groups; |
| 102 | |
| 103 | /* Bind the socket to the netlink structure for anything. */ |
| edd7c245 |
104 | if ( zserv_privs.change(ZPRIVS_RAISE) ) |
| 105 | { |
| 106 | zlog (NULL, LOG_ERR, "Can't raise privileges"); |
| 107 | return -1; |
| 108 | } |
| 109 | |
| 718e3744 |
110 | ret = bind (sock, (struct sockaddr *) &snl, sizeof snl); |
| 111 | if (ret < 0) |
| 112 | { |
| edd7c245 |
113 | if ( zserv_privs.change(ZPRIVS_LOWER) ) |
| 114 | zlog (NULL, LOG_ERR, "Can't lower privileges"); |
| 718e3744 |
115 | zlog (NULL, LOG_ERR, "Can't bind %s socket to group 0x%x: %s", |
| 116 | nl->name, snl.nl_groups, strerror (errno)); |
| 117 | close (sock); |
| 118 | return -1; |
| 119 | } |
| edd7c245 |
120 | |
| 121 | if ( zserv_privs.change(ZPRIVS_LOWER) ) |
| 122 | zlog (NULL, LOG_ERR, "Can't lower privileges"); |
| 718e3744 |
123 | |
| 124 | /* multiple netlink sockets will have different nl_pid */ |
| 125 | namelen = sizeof snl; |
| 126 | ret = getsockname (sock, (struct sockaddr *) &snl, &namelen); |
| 127 | if (ret < 0 || namelen != sizeof snl) |
| 128 | { |
| 129 | zlog (NULL, LOG_ERR, "Can't get %s socket name: %s", nl->name, |
| 130 | strerror (errno)); |
| 131 | close (sock); |
| 132 | return -1; |
| 133 | } |
| 134 | |
| 135 | nl->snl = snl; |
| 136 | nl->sock = sock; |
| 137 | return ret; |
| 138 | } |
| 139 | |
| 5f37d86f |
140 | int set_netlink_blocking(struct nlsock *nl, int *flags) |
| 141 | { |
| 142 | |
| 143 | /* Change socket flags for blocking I/O. */ |
| 144 | if((*flags = fcntl(nl->sock, F_GETFL, 0)) < 0) |
| 145 | { |
| 146 | zlog (NULL, LOG_ERR, "%s:%i F_GETFL error: %s", |
| 147 | __FUNCTION__, __LINE__, strerror (errno)); |
| 148 | return -1; |
| 149 | } |
| 150 | *flags &= ~O_NONBLOCK; |
| 151 | if(fcntl(nl->sock, F_SETFL, *flags) < 0) |
| 152 | { |
| 153 | zlog (NULL, LOG_ERR, "%s:%i F_SETFL error: %s", |
| 154 | __FUNCTION__, __LINE__, strerror (errno)); |
| 155 | return -1; |
| 156 | } |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | int set_netlink_nonblocking(struct nlsock *nl, int *flags) |
| 161 | { |
| 162 | /* Restore socket flags for nonblocking I/O */ |
| 163 | *flags |= O_NONBLOCK; |
| 164 | if(fcntl(nl->sock, F_SETFL, *flags) < 0) |
| 165 | { |
| 166 | zlog (NULL, LOG_ERR, "%s:%i F_SETFL error: %s", |
| 167 | __FUNCTION__, __LINE__, strerror (errno)); |
| 168 | return -1; |
| 169 | } |
| 170 | return 0; |
| 171 | } |
| 172 | |
| 718e3744 |
173 | /* Get type specified information from netlink. */ |
| 174 | static int |
| 175 | netlink_request (int family, int type, struct nlsock *nl) |
| 176 | { |
| 177 | int ret; |
| 178 | struct sockaddr_nl snl; |
| 179 | |
| 180 | struct |
| 181 | { |
| 182 | struct nlmsghdr nlh; |
| 183 | struct rtgenmsg g; |
| 184 | } req; |
| 185 | |
| 186 | |
| 187 | /* Check netlink socket. */ |
| 188 | if (nl->sock < 0) |
| 189 | { |
| 190 | zlog (NULL, LOG_ERR, "%s socket isn't active.", nl->name); |
| 191 | return -1; |
| 192 | } |
| 193 | |
| 194 | memset (&snl, 0, sizeof snl); |
| 195 | snl.nl_family = AF_NETLINK; |
| 196 | |
| 197 | req.nlh.nlmsg_len = sizeof req; |
| 198 | req.nlh.nlmsg_type = type; |
| 199 | req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST; |
| 200 | req.nlh.nlmsg_pid = 0; |
| 201 | req.nlh.nlmsg_seq = ++nl->seq; |
| 202 | req.g.rtgen_family = family; |
| edd7c245 |
203 | |
| 204 | /* linux appears to check capabilities on every message |
| 205 | * have to raise caps for every message sent |
| 206 | */ |
| 207 | if ( zserv_privs.change(ZPRIVS_RAISE) ) |
| 208 | { |
| 209 | zlog (NULL, LOG_ERR, "Can't raise privileges"); |
| 210 | return -1; |
| 211 | } |
| 718e3744 |
212 | |
| 213 | ret = sendto (nl->sock, (void*) &req, sizeof req, 0, |
| 214 | (struct sockaddr*) &snl, sizeof snl); |
| edd7c245 |
215 | |
| 216 | if ( zserv_privs.change(ZPRIVS_LOWER) ) |
| 217 | zlog (NULL, LOG_ERR, "Can't lower privileges"); |
| 218 | |
| 718e3744 |
219 | if (ret < 0) |
| edd7c245 |
220 | { |
| 718e3744 |
221 | zlog (NULL, LOG_ERR, "%s sendto failed: %s", nl->name, strerror (errno)); |
| 222 | return -1; |
| 223 | } |
| edd7c245 |
224 | |
| 718e3744 |
225 | return 0; |
| 226 | } |
| 227 | |
| 228 | /* Receive message from netlink interface and pass those information |
| 229 | to the given function. */ |
| 230 | static int |
| 231 | netlink_parse_info (int (*filter) (struct sockaddr_nl *, struct nlmsghdr *), |
| 232 | struct nlsock *nl) |
| 233 | { |
| 234 | int status; |
| 235 | int ret = 0; |
| 236 | int error; |
| 237 | |
| 238 | while (1) |
| 239 | { |
| 240 | char buf[4096]; |
| 241 | struct iovec iov = { buf, sizeof buf }; |
| 242 | struct sockaddr_nl snl; |
| 243 | struct msghdr msg = { (void*)&snl, sizeof snl, &iov, 1, NULL, 0, 0}; |
| 244 | struct nlmsghdr *h; |
| 245 | |
| edd7c245 |
246 | if ( zserv_privs.change(ZPRIVS_RAISE) ) |
| 247 | zlog (NULL, LOG_ERR, "Can't raise privileges"); |
| 248 | |
| 718e3744 |
249 | status = recvmsg (nl->sock, &msg, 0); |
| edd7c245 |
250 | |
| 251 | if ( zserv_privs.change(ZPRIVS_LOWER) ) |
| 252 | zlog (NULL, LOG_ERR, "Can't lower privileges"); |
| 718e3744 |
253 | |
| 254 | if (status < 0) |
| 255 | { |
| 256 | if (errno == EINTR) |
| 257 | continue; |
| 258 | if (errno == EWOULDBLOCK || errno == EAGAIN) |
| 259 | break; |
| 260 | zlog (NULL, LOG_ERR, "%s recvmsg overrun", nl->name); |
| 261 | continue; |
| 262 | } |
| 263 | |
| 264 | if (status == 0) |
| 265 | { |
| 266 | zlog (NULL, LOG_ERR, "%s EOF", nl->name); |
| 267 | return -1; |
| 268 | } |
| 269 | |
| 270 | if (msg.msg_namelen != sizeof snl) |
| 271 | { |
| 272 | zlog (NULL, LOG_ERR, "%s sender address length error: length %d", |
| 273 | nl->name, msg.msg_namelen); |
| 274 | return -1; |
| 275 | } |
| 276 | |
| 277 | for (h = (struct nlmsghdr *) buf; NLMSG_OK (h, status); |
| 278 | h = NLMSG_NEXT (h, status)) |
| 279 | { |
| 280 | /* Finish of reading. */ |
| 281 | if (h->nlmsg_type == NLMSG_DONE) |
| 282 | return ret; |
| 283 | |
| 284 | /* Error handling. */ |
| 285 | if (h->nlmsg_type == NLMSG_ERROR) |
| 286 | { |
| 287 | struct nlmsgerr *err = (struct nlmsgerr *) NLMSG_DATA (h); |
| 288 | |
| 289 | /* If the error field is zero, then this is an ACK */ |
| 290 | if (err->error == 0) |
| 291 | { |
| 292 | if (IS_ZEBRA_DEBUG_KERNEL) |
| 293 | { |
| 294 | zlog_info("%s: %s ACK: type=%s(%u), seq=%u, pid=%d", |
| 295 | __FUNCTION__, nl->name, |
| 296 | lookup (nlmsg_str, err->msg.nlmsg_type), |
| 297 | err->msg.nlmsg_type, err->msg.nlmsg_seq, |
| 298 | err->msg.nlmsg_pid); |
| 299 | } |
| 300 | |
| 301 | /* return if not a multipart message, otherwise continue */ |
| 302 | if(!(h->nlmsg_flags & NLM_F_MULTI)) |
| 303 | { |
| 304 | return 0; |
| 305 | } |
| 306 | continue; |
| 307 | } |
| 308 | |
| 309 | if (h->nlmsg_len < NLMSG_LENGTH (sizeof (struct nlmsgerr))) |
| 310 | { |
| 311 | zlog (NULL, LOG_ERR, "%s error: message truncated", |
| 312 | nl->name); |
| 313 | return -1; |
| 314 | } |
| d753e9ee |
315 | |
| 316 | /* Deal with Error Noise - MAG*/ |
| 317 | { |
| 318 | int loglvl = LOG_ERR; |
| 319 | int errnum = err->error; |
| 320 | int msg_type = err->msg.nlmsg_type; |
| 321 | |
| 322 | if (nl == &netlink_cmd |
| 323 | && (-errnum == ENODEV || -errnum == ESRCH) |
| 324 | && (msg_type == RTM_NEWROUTE |
| 325 | || msg_type == RTM_DELROUTE)) |
| 326 | loglvl = LOG_DEBUG; |
| 327 | |
| 328 | zlog (NULL, loglvl, "%s error: %s, type=%s(%u), " |
| 329 | "seq=%u, pid=%d", |
| 330 | nl->name, strerror (-errnum), |
| 331 | lookup (nlmsg_str, msg_type), |
| 332 | msg_type, err->msg.nlmsg_seq, |
| 718e3744 |
333 | err->msg.nlmsg_pid); |
| d753e9ee |
334 | } |
| 718e3744 |
335 | /* |
| 336 | ret = -1; |
| 337 | continue; |
| 338 | */ |
| 339 | return -1; |
| 340 | } |
| 341 | |
| 342 | /* OK we got netlink message. */ |
| 343 | if (IS_ZEBRA_DEBUG_KERNEL) |
| 344 | zlog_info ("netlink_parse_info: %s type %s(%u), seq=%u, pid=%d", |
| 345 | nl->name, |
| 346 | lookup (nlmsg_str, h->nlmsg_type), h->nlmsg_type, |
| 347 | h->nlmsg_seq, h->nlmsg_pid); |
| 348 | |
| 349 | /* skip unsolicited messages originating from command socket */ |
| 350 | if (nl != &netlink_cmd && h->nlmsg_pid == netlink_cmd.snl.nl_pid) |
| 351 | { |
| 352 | if (IS_ZEBRA_DEBUG_KERNEL) |
| 353 | zlog_info ("netlink_parse_info: %s packet comes from %s", |
| 354 | nl->name, netlink_cmd.name); |
| 355 | continue; |
| 356 | } |
| 357 | |
| 358 | error = (*filter) (&snl, h); |
| 359 | if (error < 0) |
| 360 | { |
| 361 | zlog (NULL, LOG_ERR, "%s filter function error", nl->name); |
| 362 | ret = error; |
| 363 | } |
| 364 | } |
| 365 | |
| 366 | /* After error care. */ |
| 367 | if (msg.msg_flags & MSG_TRUNC) |
| 368 | { |
| 369 | zlog (NULL, LOG_ERR, "%s error: message truncated", nl->name); |
| 370 | continue; |
| 371 | } |
| 372 | if (status) |
| 373 | { |
| 374 | zlog (NULL, LOG_ERR, "%s error: data remnant size %d", nl->name, |
| 375 | status); |
| 376 | return -1; |
| 377 | } |
| 378 | } |
| 379 | return ret; |
| 380 | } |
| 381 | |
| 382 | /* Utility function for parse rtattr. */ |
| 383 | static void |
| 384 | netlink_parse_rtattr (struct rtattr **tb, int max, struct rtattr *rta, int len) |
| 385 | { |
| 386 | while (RTA_OK(rta, len)) |
| 387 | { |
| 388 | if (rta->rta_type <= max) |
| 389 | tb[rta->rta_type] = rta; |
| 390 | rta = RTA_NEXT(rta,len); |
| 391 | } |
| 392 | } |
| 393 | |
| 394 | /* Called from interface_lookup_netlink(). This function is only used |
| 395 | during bootstrap. */ |
| 396 | int |
| 397 | netlink_interface (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| 398 | { |
| 399 | int len; |
| 400 | struct ifinfomsg *ifi; |
| 401 | struct rtattr *tb[IFLA_MAX + 1]; |
| 402 | struct interface *ifp; |
| 403 | char *name; |
| 404 | int i; |
| 405 | |
| 406 | ifi = NLMSG_DATA (h); |
| 407 | |
| 408 | if (h->nlmsg_type != RTM_NEWLINK) |
| 409 | return 0; |
| 410 | |
| 411 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct ifinfomsg)); |
| 412 | if (len < 0) |
| 413 | return -1; |
| 414 | |
| 415 | /* Looking up interface name. */ |
| 416 | memset (tb, 0, sizeof tb); |
| 417 | netlink_parse_rtattr (tb, IFLA_MAX, IFLA_RTA (ifi), len); |
| 418 | if (tb[IFLA_IFNAME] == NULL) |
| 419 | return -1; |
| 420 | name = (char *)RTA_DATA(tb[IFLA_IFNAME]); |
| 421 | |
| 422 | /* Add interface. */ |
| 423 | ifp = if_get_by_name (name); |
| 424 | |
| 425 | ifp->ifindex = ifi->ifi_index; |
| 426 | ifp->flags = ifi->ifi_flags & 0x0000fffff; |
| 427 | ifp->mtu = *(int *)RTA_DATA (tb[IFLA_MTU]); |
| 428 | ifp->metric = 1; |
| 429 | |
| 430 | /* Hardware type and address. */ |
| 431 | ifp->hw_type = ifi->ifi_type; |
| 432 | |
| 433 | if (tb[IFLA_ADDRESS]) |
| 434 | { |
| 435 | int hw_addr_len; |
| 436 | |
| 437 | hw_addr_len = RTA_PAYLOAD(tb[IFLA_ADDRESS]); |
| 438 | |
| 439 | if (hw_addr_len > INTERFACE_HWADDR_MAX) |
| 440 | zlog_warn ("Hardware address is too large: %d", hw_addr_len); |
| 441 | else |
| 442 | { |
| 443 | ifp->hw_addr_len = hw_addr_len; |
| 444 | memcpy (ifp->hw_addr, RTA_DATA(tb[IFLA_ADDRESS]), hw_addr_len); |
| 445 | |
| 446 | for (i = 0; i < hw_addr_len; i++) |
| 447 | if (ifp->hw_addr[i] != 0) |
| 448 | break; |
| 449 | |
| 450 | if (i == hw_addr_len) |
| 451 | ifp->hw_addr_len = 0; |
| 452 | else |
| 453 | ifp->hw_addr_len = hw_addr_len; |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | if_add_update (ifp); |
| 458 | |
| 459 | return 0; |
| 460 | } |
| 461 | |
| 462 | /* Lookup interface IPv4/IPv6 address. */ |
| 463 | int |
| 464 | netlink_interface_addr (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| 465 | { |
| 466 | int len; |
| 467 | struct ifaddrmsg *ifa; |
| 468 | struct rtattr *tb [IFA_MAX + 1]; |
| 469 | struct interface *ifp; |
| 470 | void *addr = NULL; |
| 471 | void *broad = NULL; |
| 472 | u_char flags = 0; |
| 473 | char *label = NULL; |
| 00df0c1e |
474 | int peeronly = 0; |
| 718e3744 |
475 | |
| 476 | ifa = NLMSG_DATA (h); |
| 477 | |
| 478 | if (ifa->ifa_family != AF_INET |
| 479 | #ifdef HAVE_IPV6 |
| 480 | && ifa->ifa_family != AF_INET6 |
| 481 | #endif /* HAVE_IPV6 */ |
| 482 | ) |
| 483 | return 0; |
| 484 | |
| 485 | if (h->nlmsg_type != RTM_NEWADDR && h->nlmsg_type != RTM_DELADDR) |
| 486 | return 0; |
| 487 | |
| 488 | len = h->nlmsg_len - NLMSG_LENGTH(sizeof (struct ifaddrmsg)); |
| 489 | if (len < 0) |
| 490 | return -1; |
| 491 | |
| 492 | memset (tb, 0, sizeof tb); |
| 493 | netlink_parse_rtattr (tb, IFA_MAX, IFA_RTA (ifa), len); |
| 494 | |
| 495 | ifp = if_lookup_by_index (ifa->ifa_index); |
| 496 | if (ifp == NULL) |
| 497 | { |
| 498 | zlog_err ("netlink_interface_addr can't find interface by index %d", |
| 499 | ifa->ifa_index); |
| 500 | return -1; |
| 501 | } |
| 502 | |
| 00df0c1e |
503 | if (IS_ZEBRA_DEBUG_KERNEL) /* remove this line to see initial ifcfg */ |
| 718e3744 |
504 | { |
| 00df0c1e |
505 | char buf[BUFSIZ]; |
| 506 | zlog_info ("netlink_interface_addr %s %s/%d:", |
| 507 | lookup (nlmsg_str, h->nlmsg_type), |
| 508 | ifp->name, ifa->ifa_prefixlen); |
| 718e3744 |
509 | if (tb[IFA_LOCAL]) |
| 00df0c1e |
510 | zlog_info (" IFA_LOCAL %s", inet_ntop (ifa->ifa_family, |
| 511 | RTA_DATA (tb[IFA_LOCAL]), buf, BUFSIZ)); |
| 718e3744 |
512 | if (tb[IFA_ADDRESS]) |
| 00df0c1e |
513 | zlog_info (" IFA_ADDRESS %s", inet_ntop (ifa->ifa_family, |
| 514 | RTA_DATA (tb[IFA_ADDRESS]), buf, BUFSIZ)); |
| 718e3744 |
515 | if (tb[IFA_BROADCAST]) |
| 00df0c1e |
516 | zlog_info (" IFA_BROADCAST %s", inet_ntop (ifa->ifa_family, |
| 517 | RTA_DATA (tb[IFA_BROADCAST]), buf, BUFSIZ)); |
| 518 | if (tb[IFA_LABEL] && strcmp (ifp->name, RTA_DATA (tb[IFA_LABEL]))) |
| 519 | zlog_info (" IFA_LABEL %s", RTA_DATA (tb[IFA_LABEL])); |
| 718e3744 |
520 | } |
| 521 | |
| 00df0c1e |
522 | /* peer or broadcast network? */ |
| 523 | if (ifa->ifa_family == AF_INET) |
| 524 | peeronly = if_is_pointopoint (ifp) || |
| 525 | ifa->ifa_prefixlen >= IPV4_MAX_PREFIXLEN - 1; |
| 526 | #ifdef HAVE_IPV6 |
| 8fdcfdec |
527 | if (ifa->ifa_family == AF_INET6) { |
| 00df0c1e |
528 | peeronly = if_is_pointopoint (ifp) || |
| 529 | ifa->ifa_prefixlen >= IPV6_MAX_PREFIXLEN - 1; |
| 8fdcfdec |
530 | } |
| 00df0c1e |
531 | #endif /* HAVE_IPV6*/ |
| 8fdcfdec |
532 | if (!(tb[IFA_LOCAL] && tb[IFA_ADDRESS])) { |
| 533 | /* FIXME: IPv6 Appears to have only IFA_ADDRESS */ |
| 534 | peeronly=0; |
| 535 | } |
| 00df0c1e |
536 | |
| 537 | /* network. prefixlen applies to IFA_ADDRESS rather than IFA_LOCAL */ |
| 538 | if (tb[IFA_ADDRESS] && !peeronly) |
| 539 | addr = RTA_DATA (tb[IFA_ADDRESS]); |
| 540 | else if (tb[IFA_LOCAL]) |
| 541 | addr = RTA_DATA (tb[IFA_LOCAL]); |
| 542 | else |
| 543 | addr = NULL; |
| 544 | |
| 545 | /* broadcast/peer */ |
| 546 | if (tb[IFA_BROADCAST]) |
| 547 | broad = RTA_DATA (tb[IFA_BROADCAST]); |
| 548 | else if (tb[IFA_ADDRESS] && peeronly) |
| 549 | broad = RTA_DATA (tb[IFA_ADDRESS]); /* peer address specified */ |
| 550 | else |
| 551 | broad = NULL; |
| 552 | |
| 718e3744 |
553 | /* Flags. */ |
| 554 | if (ifa->ifa_flags & IFA_F_SECONDARY) |
| 555 | SET_FLAG (flags, ZEBRA_IFA_SECONDARY); |
| 556 | |
| 557 | /* Label */ |
| 558 | if (tb[IFA_LABEL]) |
| 559 | label = (char *) RTA_DATA (tb[IFA_LABEL]); |
| 560 | |
| 561 | if (ifp && label && strcmp (ifp->name, label) == 0) |
| 562 | label = NULL; |
| 563 | |
| 564 | /* Register interface address to the interface. */ |
| 565 | if (ifa->ifa_family == AF_INET) |
| 566 | { |
| 567 | if (h->nlmsg_type == RTM_NEWADDR) |
| 568 | connected_add_ipv4 (ifp, flags, |
| 569 | (struct in_addr *) addr, ifa->ifa_prefixlen, |
| 570 | (struct in_addr *) broad, label); |
| 571 | else |
| 572 | connected_delete_ipv4 (ifp, flags, |
| 573 | (struct in_addr *) addr, ifa->ifa_prefixlen, |
| 574 | (struct in_addr *) broad, label); |
| 575 | } |
| 576 | #ifdef HAVE_IPV6 |
| 577 | if (ifa->ifa_family == AF_INET6) |
| 578 | { |
| 579 | if (h->nlmsg_type == RTM_NEWADDR) |
| 580 | connected_add_ipv6 (ifp, |
| 581 | (struct in6_addr *) addr, ifa->ifa_prefixlen, |
| 582 | (struct in6_addr *) broad); |
| 583 | else |
| 584 | connected_delete_ipv6 (ifp, |
| 585 | (struct in6_addr *) addr, ifa->ifa_prefixlen, |
| 586 | (struct in6_addr *) broad); |
| 587 | } |
| 588 | #endif /* HAVE_IPV6*/ |
| 589 | |
| 590 | return 0; |
| 591 | } |
| 592 | |
| 593 | /* Looking up routing table by netlink interface. */ |
| 594 | int |
| 595 | netlink_routing_table (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| 596 | { |
| 597 | int len; |
| 598 | struct rtmsg *rtm; |
| 599 | struct rtattr *tb [RTA_MAX + 1]; |
| 600 | u_char flags = 0; |
| 601 | |
| 602 | char anyaddr[16] = {0}; |
| 603 | |
| 604 | int index; |
| 605 | int table; |
| 606 | void *dest; |
| 607 | void *gate; |
| 608 | |
| 609 | rtm = NLMSG_DATA (h); |
| 610 | |
| 611 | if (h->nlmsg_type != RTM_NEWROUTE) |
| 612 | return 0; |
| 613 | if (rtm->rtm_type != RTN_UNICAST) |
| 614 | return 0; |
| 615 | |
| 616 | table = rtm->rtm_table; |
| 617 | #if 0 /* we weed them out later in rib_weed_tables () */ |
| 618 | if (table != RT_TABLE_MAIN && table != rtm_table_default) |
| 619 | return 0; |
| 620 | #endif |
| 621 | |
| 622 | len = h->nlmsg_len - NLMSG_LENGTH(sizeof (struct rtmsg)); |
| 623 | if (len < 0) |
| 624 | return -1; |
| 625 | |
| 626 | memset (tb, 0, sizeof tb); |
| 627 | netlink_parse_rtattr (tb, RTA_MAX, RTM_RTA (rtm), len); |
| 628 | |
| 629 | if (rtm->rtm_flags & RTM_F_CLONED) |
| 630 | return 0; |
| 631 | if (rtm->rtm_protocol == RTPROT_REDIRECT) |
| 632 | return 0; |
| 633 | if (rtm->rtm_protocol == RTPROT_KERNEL) |
| 634 | return 0; |
| 635 | |
| 636 | if (rtm->rtm_src_len != 0) |
| 637 | return 0; |
| 638 | |
| 639 | /* Route which inserted by Zebra. */ |
| 640 | if (rtm->rtm_protocol == RTPROT_ZEBRA) |
| 641 | flags |= ZEBRA_FLAG_SELFROUTE; |
| 642 | |
| 643 | index = 0; |
| 644 | dest = NULL; |
| 645 | gate = NULL; |
| 646 | |
| 647 | if (tb[RTA_OIF]) |
| 648 | index = *(int *) RTA_DATA (tb[RTA_OIF]); |
| 649 | |
| 650 | if (tb[RTA_DST]) |
| 651 | dest = RTA_DATA (tb[RTA_DST]); |
| 652 | else |
| 653 | dest = anyaddr; |
| 654 | |
| 655 | /* Multipath treatment is needed. */ |
| 656 | if (tb[RTA_GATEWAY]) |
| 657 | gate = RTA_DATA (tb[RTA_GATEWAY]); |
| 658 | |
| 659 | if (rtm->rtm_family == AF_INET) |
| 660 | { |
| 661 | struct prefix_ipv4 p; |
| 662 | p.family = AF_INET; |
| 663 | memcpy (&p.prefix, dest, 4); |
| 664 | p.prefixlen = rtm->rtm_dst_len; |
| 665 | |
| 666 | rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, flags, &p, gate, index, table, 0, 0); |
| 667 | } |
| 668 | #ifdef HAVE_IPV6 |
| 669 | if (rtm->rtm_family == AF_INET6) |
| 670 | { |
| 671 | struct prefix_ipv6 p; |
| 672 | p.family = AF_INET6; |
| 673 | memcpy (&p.prefix, dest, 16); |
| 674 | p.prefixlen = rtm->rtm_dst_len; |
| 675 | |
| 676 | rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, flags, &p, gate, index, table); |
| 677 | } |
| 678 | #endif /* HAVE_IPV6 */ |
| 679 | |
| 680 | return 0; |
| 681 | } |
| 682 | |
| 683 | struct message rtproto_str [] = |
| 684 | { |
| 685 | {RTPROT_REDIRECT, "redirect"}, |
| 686 | {RTPROT_KERNEL, "kernel"}, |
| 687 | {RTPROT_BOOT, "boot"}, |
| 688 | {RTPROT_STATIC, "static"}, |
| 689 | {RTPROT_GATED, "GateD"}, |
| 690 | {RTPROT_RA, "router advertisement"}, |
| 691 | {RTPROT_MRT, "MRT"}, |
| 692 | {RTPROT_ZEBRA, "Zebra"}, |
| 693 | #ifdef RTPROT_BIRD |
| 694 | {RTPROT_BIRD, "BIRD"}, |
| 695 | #endif /* RTPROT_BIRD */ |
| 696 | {0, NULL} |
| 697 | }; |
| 698 | |
| 699 | /* Routing information change from the kernel. */ |
| 700 | int |
| 701 | netlink_route_change (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| 702 | { |
| 703 | int len; |
| 704 | struct rtmsg *rtm; |
| 705 | struct rtattr *tb [RTA_MAX + 1]; |
| 706 | |
| 707 | char anyaddr[16] = {0}; |
| 708 | |
| 709 | int index; |
| 710 | int table; |
| 711 | void *dest; |
| 712 | void *gate; |
| 713 | |
| 714 | rtm = NLMSG_DATA (h); |
| 715 | |
| 716 | if (! (h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE)) |
| 717 | { |
| 718 | /* If this is not route add/delete message print warning. */ |
| 719 | zlog_warn ("Kernel message: %d\n", h->nlmsg_type); |
| 720 | return 0; |
| 721 | } |
| 722 | |
| 723 | /* Connected route. */ |
| 724 | if (IS_ZEBRA_DEBUG_KERNEL) |
| 725 | zlog_info ("%s %s %s proto %s", |
| 726 | h->nlmsg_type == RTM_NEWROUTE ? "RTM_NEWROUTE" : "RTM_DELROUTE", |
| 727 | rtm->rtm_family == AF_INET ? "ipv4" : "ipv6", |
| 728 | rtm->rtm_type == RTN_UNICAST ? "unicast" : "multicast", |
| 729 | lookup (rtproto_str, rtm->rtm_protocol)); |
| 730 | |
| 731 | if (rtm->rtm_type != RTN_UNICAST) |
| 732 | { |
| 733 | return 0; |
| 734 | } |
| 735 | |
| 736 | table = rtm->rtm_table; |
| 737 | if (table != RT_TABLE_MAIN && table != rtm_table_default) |
| 738 | { |
| 739 | return 0; |
| 740 | } |
| 741 | |
| 742 | len = h->nlmsg_len - NLMSG_LENGTH(sizeof (struct rtmsg)); |
| 743 | if (len < 0) |
| 744 | return -1; |
| 745 | |
| 746 | memset (tb, 0, sizeof tb); |
| 747 | netlink_parse_rtattr (tb, RTA_MAX, RTM_RTA (rtm), len); |
| 748 | |
| 749 | if (rtm->rtm_flags & RTM_F_CLONED) |
| 750 | return 0; |
| 751 | if (rtm->rtm_protocol == RTPROT_REDIRECT) |
| 752 | return 0; |
| 753 | if (rtm->rtm_protocol == RTPROT_KERNEL) |
| 754 | return 0; |
| 755 | |
| 756 | if (rtm->rtm_protocol == RTPROT_ZEBRA && h->nlmsg_type == RTM_NEWROUTE) |
| 757 | return 0; |
| 758 | |
| 759 | if (rtm->rtm_src_len != 0) |
| 760 | { |
| 761 | zlog_warn ("netlink_route_change(): no src len"); |
| 762 | return 0; |
| 763 | } |
| 764 | |
| 765 | index = 0; |
| 766 | dest = NULL; |
| 767 | gate = NULL; |
| 768 | |
| 769 | if (tb[RTA_OIF]) |
| 770 | index = *(int *) RTA_DATA (tb[RTA_OIF]); |
| 771 | |
| 772 | if (tb[RTA_DST]) |
| 773 | dest = RTA_DATA (tb[RTA_DST]); |
| 774 | else |
| 775 | dest = anyaddr; |
| 776 | |
| 777 | if (tb[RTA_GATEWAY]) |
| 778 | gate = RTA_DATA (tb[RTA_GATEWAY]); |
| 779 | |
| 780 | if (rtm->rtm_family == AF_INET) |
| 781 | { |
| 782 | struct prefix_ipv4 p; |
| 783 | p.family = AF_INET; |
| 784 | memcpy (&p.prefix, dest, 4); |
| 785 | p.prefixlen = rtm->rtm_dst_len; |
| 786 | |
| 787 | if (IS_ZEBRA_DEBUG_KERNEL) |
| 788 | { |
| 789 | if (h->nlmsg_type == RTM_NEWROUTE) |
| 790 | zlog_info ("RTM_NEWROUTE %s/%d", |
| 791 | inet_ntoa (p.prefix), p.prefixlen); |
| 792 | else |
| 793 | zlog_info ("RTM_DELROUTE %s/%d", |
| 794 | inet_ntoa (p.prefix), p.prefixlen); |
| 795 | } |
| 796 | |
| 797 | if (h->nlmsg_type == RTM_NEWROUTE) |
| 798 | rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, table, 0, 0); |
| 799 | else |
| 800 | rib_delete_ipv4 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, table); |
| 801 | } |
| 802 | |
| 803 | #ifdef HAVE_IPV6 |
| 804 | if (rtm->rtm_family == AF_INET6) |
| 805 | { |
| 806 | struct prefix_ipv6 p; |
| 807 | char buf[BUFSIZ]; |
| 808 | |
| 809 | p.family = AF_INET6; |
| 810 | memcpy (&p.prefix, dest, 16); |
| 811 | p.prefixlen = rtm->rtm_dst_len; |
| 812 | |
| 813 | if (IS_ZEBRA_DEBUG_KERNEL) |
| 814 | { |
| 815 | if (h->nlmsg_type == RTM_NEWROUTE) |
| 816 | zlog_info ("RTM_NEWROUTE %s/%d", |
| 817 | inet_ntop (AF_INET6, &p.prefix, buf, BUFSIZ), |
| 818 | p.prefixlen); |
| 819 | else |
| 820 | zlog_info ("RTM_DELROUTE %s/%d", |
| 821 | inet_ntop (AF_INET6, &p.prefix, buf, BUFSIZ), |
| 822 | p.prefixlen); |
| 823 | } |
| 824 | |
| 825 | if (h->nlmsg_type == RTM_NEWROUTE) |
| 826 | rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, 0); |
| 827 | else |
| 828 | rib_delete_ipv6 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, 0); |
| 829 | } |
| 830 | #endif /* HAVE_IPV6 */ |
| 831 | |
| 832 | return 0; |
| 833 | } |
| 834 | |
| 835 | int |
| 836 | netlink_link_change (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| 837 | { |
| 838 | int len; |
| 839 | struct ifinfomsg *ifi; |
| 840 | struct rtattr *tb [IFLA_MAX + 1]; |
| 841 | struct interface *ifp; |
| 842 | char *name; |
| 843 | |
| 844 | ifi = NLMSG_DATA (h); |
| 845 | |
| 846 | if (! (h->nlmsg_type == RTM_NEWLINK || h->nlmsg_type == RTM_DELLINK)) |
| 847 | { |
| 848 | /* If this is not link add/delete message so print warning. */ |
| 849 | zlog_warn ("netlink_link_change: wrong kernel message %d\n", |
| 850 | h->nlmsg_type); |
| 851 | return 0; |
| 852 | } |
| 853 | |
| 854 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct ifinfomsg)); |
| 855 | if (len < 0) |
| 856 | return -1; |
| 857 | |
| 858 | /* Looking up interface name. */ |
| 859 | memset (tb, 0, sizeof tb); |
| 860 | netlink_parse_rtattr (tb, IFLA_MAX, IFLA_RTA (ifi), len); |
| 861 | if (tb[IFLA_IFNAME] == NULL) |
| 862 | return -1; |
| 863 | name = (char *)RTA_DATA(tb[IFLA_IFNAME]); |
| 864 | |
| 865 | /* Add interface. */ |
| 866 | if (h->nlmsg_type == RTM_NEWLINK) |
| 867 | { |
| 868 | ifp = if_lookup_by_name (name); |
| 869 | |
| 870 | if (ifp == NULL || ! CHECK_FLAG (ifp->status, ZEBRA_INTERFACE_ACTIVE)) |
| 871 | { |
| 872 | if (ifp == NULL) |
| 873 | ifp = if_get_by_name (name); |
| 874 | |
| 875 | ifp->ifindex = ifi->ifi_index; |
| 876 | ifp->flags = ifi->ifi_flags & 0x0000fffff; |
| 877 | ifp->mtu = *(int *)RTA_DATA (tb[IFLA_MTU]); |
| 878 | ifp->metric = 1; |
| 879 | |
| 880 | /* If new link is added. */ |
| 881 | if_add_update(ifp); |
| 882 | } |
| 883 | else |
| 884 | { |
| 885 | /* Interface status change. */ |
| 886 | ifp->ifindex = ifi->ifi_index; |
| 887 | ifp->mtu = *(int *)RTA_DATA (tb[IFLA_MTU]); |
| 888 | ifp->metric = 1; |
| 889 | |
| 2e3b2e47 |
890 | if (if_is_operative (ifp)) |
| 718e3744 |
891 | { |
| 892 | ifp->flags = ifi->ifi_flags & 0x0000fffff; |
| 2e3b2e47 |
893 | if (! if_is_operative (ifp)) |
| 718e3744 |
894 | if_down (ifp); |
| 895 | } |
| 896 | else |
| 897 | { |
| 898 | ifp->flags = ifi->ifi_flags & 0x0000fffff; |
| 2e3b2e47 |
899 | if (if_is_operative (ifp)) |
| 718e3744 |
900 | if_up (ifp); |
| 901 | } |
| 902 | } |
| 903 | } |
| 904 | else |
| 905 | { |
| 906 | /* RTM_DELLINK. */ |
| 907 | ifp = if_lookup_by_name (name); |
| 908 | |
| 909 | if (ifp == NULL) |
| 910 | { |
| 911 | zlog (NULL, LOG_WARNING, "interface %s is deleted but can't find", |
| 912 | name); |
| 913 | return 0; |
| 914 | } |
| 915 | |
| 916 | if_delete_update (ifp); |
| 917 | } |
| 918 | |
| 919 | return 0; |
| 920 | } |
| 921 | |
| 922 | int |
| 923 | netlink_information_fetch (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| 924 | { |
| 925 | switch (h->nlmsg_type) |
| 926 | { |
| 927 | case RTM_NEWROUTE: |
| 928 | return netlink_route_change (snl, h); |
| 929 | break; |
| 930 | case RTM_DELROUTE: |
| 931 | return netlink_route_change (snl, h); |
| 932 | break; |
| 933 | case RTM_NEWLINK: |
| 934 | return netlink_link_change (snl, h); |
| 935 | break; |
| 936 | case RTM_DELLINK: |
| 937 | return netlink_link_change (snl, h); |
| 938 | break; |
| 939 | case RTM_NEWADDR: |
| 940 | return netlink_interface_addr (snl, h); |
| 941 | break; |
| 942 | case RTM_DELADDR: |
| 943 | return netlink_interface_addr (snl, h); |
| 944 | break; |
| 945 | default: |
| 946 | zlog_warn ("Unknown netlink nlmsg_type %d\n", h->nlmsg_type); |
| 947 | break; |
| 948 | } |
| 949 | return 0; |
| 950 | } |
| 951 | |
| 952 | /* Interface lookup by netlink socket. */ |
| 953 | int |
| 954 | interface_lookup_netlink () |
| 955 | { |
| 956 | int ret; |
| 5f37d86f |
957 | int flags; |
| 958 | int snb_ret; |
| 959 | |
| 960 | /* |
| 961 | * Change netlink socket flags to blocking to ensure we get |
| 962 | * a reply via nelink_parse_info |
| 963 | */ |
| 964 | snb_ret = set_netlink_blocking(&netlink_cmd, &flags); |
| 965 | if(snb_ret < 0) |
| 966 | zlog (NULL, LOG_WARNING, |
| 967 | "%s:%i Warning: Could not set netlink socket to blocking.", |
| 968 | __FUNCTION__, __LINE__); |
| 969 | |
| 718e3744 |
970 | /* Get interface information. */ |
| 971 | ret = netlink_request (AF_PACKET, RTM_GETLINK, &netlink_cmd); |
| 972 | if (ret < 0) |
| 973 | return ret; |
| 974 | ret = netlink_parse_info (netlink_interface, &netlink_cmd); |
| 975 | if (ret < 0) |
| 976 | return ret; |
| 977 | |
| 978 | /* Get IPv4 address of the interfaces. */ |
| 979 | ret = netlink_request (AF_INET, RTM_GETADDR, &netlink_cmd); |
| 980 | if (ret < 0) |
| 981 | return ret; |
| 982 | ret = netlink_parse_info (netlink_interface_addr, &netlink_cmd); |
| 983 | if (ret < 0) |
| 984 | return ret; |
| 985 | |
| 986 | #ifdef HAVE_IPV6 |
| 987 | /* Get IPv6 address of the interfaces. */ |
| 988 | ret = netlink_request (AF_INET6, RTM_GETADDR, &netlink_cmd); |
| 989 | if (ret < 0) |
| 990 | return ret; |
| 991 | ret = netlink_parse_info (netlink_interface_addr, &netlink_cmd); |
| 992 | if (ret < 0) |
| 993 | return ret; |
| 994 | #endif /* HAVE_IPV6 */ |
| 995 | |
| 5f37d86f |
996 | /* restore socket flags */ |
| 997 | if(snb_ret == 0) |
| 998 | set_netlink_nonblocking(&netlink_cmd, &flags); |
| 718e3744 |
999 | return 0; |
| 1000 | } |
| 1001 | |
| 1002 | /* Routing table read function using netlink interface. Only called |
| 1003 | bootstrap time. */ |
| 1004 | int |
| 1005 | netlink_route_read () |
| 1006 | { |
| 1007 | int ret; |
| 5f37d86f |
1008 | int flags; |
| 1009 | int snb_ret; |
| 1010 | |
| 1011 | /* |
| 1012 | * Change netlink socket flags to blocking to ensure we get |
| 1013 | * a reply via nelink_parse_info |
| 1014 | */ |
| 1015 | snb_ret = set_netlink_blocking(&netlink_cmd, &flags); |
| 1016 | if(snb_ret < 0) |
| 1017 | zlog (NULL, LOG_WARNING, |
| 1018 | "%s:%i Warning: Could not set netlink socket to blocking.", |
| 1019 | __FUNCTION__, __LINE__); |
| 1020 | |
| 718e3744 |
1021 | /* Get IPv4 routing table. */ |
| 1022 | ret = netlink_request (AF_INET, RTM_GETROUTE, &netlink_cmd); |
| 1023 | if (ret < 0) |
| 1024 | return ret; |
| 1025 | ret = netlink_parse_info (netlink_routing_table, &netlink_cmd); |
| 1026 | if (ret < 0) |
| 1027 | return ret; |
| 1028 | |
| 1029 | #ifdef HAVE_IPV6 |
| 1030 | /* Get IPv6 routing table. */ |
| 1031 | ret = netlink_request (AF_INET6, RTM_GETROUTE, &netlink_cmd); |
| 1032 | if (ret < 0) |
| 1033 | return ret; |
| 1034 | ret = netlink_parse_info (netlink_routing_table, &netlink_cmd); |
| 1035 | if (ret < 0) |
| 1036 | return ret; |
| 1037 | #endif /* HAVE_IPV6 */ |
| 1038 | |
| 5f37d86f |
1039 | /* restore flags */ |
| 1040 | if(snb_ret == 0) |
| 1041 | set_netlink_nonblocking(&netlink_cmd, &flags); |
| 718e3744 |
1042 | return 0; |
| 1043 | } |
| 1044 | |
| 1045 | /* Utility function comes from iproute2. |
| 1046 | Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> */ |
| 1047 | int |
| 1048 | addattr_l (struct nlmsghdr *n, int maxlen, int type, void *data, int alen) |
| 1049 | { |
| 1050 | int len; |
| 1051 | struct rtattr *rta; |
| 1052 | |
| 1053 | len = RTA_LENGTH(alen); |
| 1054 | |
| 1055 | if (NLMSG_ALIGN(n->nlmsg_len) + len > maxlen) |
| 1056 | return -1; |
| 1057 | |
| 1058 | rta = (struct rtattr*) (((char*)n) + NLMSG_ALIGN (n->nlmsg_len)); |
| 1059 | rta->rta_type = type; |
| 1060 | rta->rta_len = len; |
| 1061 | memcpy (RTA_DATA(rta), data, alen); |
| 1062 | n->nlmsg_len = NLMSG_ALIGN (n->nlmsg_len) + len; |
| 1063 | |
| 1064 | return 0; |
| 1065 | } |
| 1066 | |
| 1067 | int |
| 1068 | rta_addattr_l (struct rtattr *rta, int maxlen, int type, void *data, int alen) |
| 1069 | { |
| 1070 | int len; |
| 1071 | struct rtattr *subrta; |
| 1072 | |
| 1073 | len = RTA_LENGTH(alen); |
| 1074 | |
| 1075 | if (RTA_ALIGN(rta->rta_len) + len > maxlen) |
| 1076 | return -1; |
| 1077 | |
| 1078 | subrta = (struct rtattr*) (((char*)rta) + RTA_ALIGN (rta->rta_len)); |
| 1079 | subrta->rta_type = type; |
| 1080 | subrta->rta_len = len; |
| 1081 | memcpy (RTA_DATA(subrta), data, alen); |
| 1082 | rta->rta_len = NLMSG_ALIGN (rta->rta_len) + len; |
| 1083 | |
| 1084 | return 0; |
| 1085 | } |
| 1086 | |
| 1087 | /* Utility function comes from iproute2. |
| 1088 | Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> */ |
| 1089 | int |
| 1090 | addattr32 (struct nlmsghdr *n, int maxlen, int type, int data) |
| 1091 | { |
| 1092 | int len; |
| 1093 | struct rtattr *rta; |
| 1094 | |
| 1095 | len = RTA_LENGTH(4); |
| 1096 | |
| 1097 | if (NLMSG_ALIGN (n->nlmsg_len) + len > maxlen) |
| 1098 | return -1; |
| 1099 | |
| 1100 | rta = (struct rtattr*) (((char*)n) + NLMSG_ALIGN (n->nlmsg_len)); |
| 1101 | rta->rta_type = type; |
| 1102 | rta->rta_len = len; |
| 1103 | memcpy (RTA_DATA(rta), &data, 4); |
| 1104 | n->nlmsg_len = NLMSG_ALIGN (n->nlmsg_len) + len; |
| 1105 | |
| 1106 | return 0; |
| 1107 | } |
| 1108 | |
| 1109 | static int |
| 1110 | netlink_talk_filter (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| 1111 | { |
| 1112 | zlog_warn ("netlink_talk: ignoring message type 0x%04x", h->nlmsg_type); |
| 1113 | return 0; |
| 1114 | } |
| 1115 | |
| 1116 | /* sendmsg() to netlink socket then recvmsg(). */ |
| 1117 | int |
| 1118 | netlink_talk (struct nlmsghdr *n, struct nlsock *nl) |
| 1119 | { |
| 1120 | int status; |
| 1121 | struct sockaddr_nl snl; |
| 1122 | struct iovec iov = { (void*) n, n->nlmsg_len }; |
| 1123 | struct msghdr msg = {(void*) &snl, sizeof snl, &iov, 1, NULL, 0, 0}; |
| 1124 | int flags = 0; |
| 5f37d86f |
1125 | int snb_ret; |
| 718e3744 |
1126 | |
| 1127 | memset (&snl, 0, sizeof snl); |
| 1128 | snl.nl_family = AF_NETLINK; |
| 1129 | |
| 1130 | n->nlmsg_seq = ++netlink_cmd.seq; |
| 1131 | |
| 1132 | /* Request an acknowledgement by setting NLM_F_ACK */ |
| 1133 | n->nlmsg_flags |= NLM_F_ACK; |
| 1134 | |
| 1135 | if (IS_ZEBRA_DEBUG_KERNEL) |
| 1136 | zlog_info ("netlink_talk: %s type %s(%u), seq=%u", netlink_cmd.name, |
| 1137 | lookup (nlmsg_str, n->nlmsg_type), n->nlmsg_type, |
| 1138 | n->nlmsg_seq); |
| 1139 | |
| 1140 | /* Send message to netlink interface. */ |
| edd7c245 |
1141 | if ( zserv_privs.change(ZPRIVS_RAISE) ) |
| 1142 | zlog (NULL, LOG_ERR, "Can't raise privileges"); |
| 718e3744 |
1143 | status = sendmsg (nl->sock, &msg, 0); |
| edd7c245 |
1144 | if ( zserv_privs.change(ZPRIVS_LOWER) ) |
| 1145 | zlog (NULL, LOG_ERR, "Can't lower privileges"); |
| 1146 | |
| 718e3744 |
1147 | if (status < 0) |
| 1148 | { |
| 1149 | zlog (NULL, LOG_ERR, "netlink_talk sendmsg() error: %s", |
| 1150 | strerror (errno)); |
| 1151 | return -1; |
| 1152 | } |
| 1153 | |
| 1154 | /* |
| 1155 | * Change socket flags for blocking I/O. |
| 1156 | * This ensures we wait for a reply in netlink_parse_info(). |
| 1157 | */ |
| 5f37d86f |
1158 | snb_ret = set_netlink_blocking(nl, &flags); |
| 1159 | if(snb_ret < 0) |
| 1160 | zlog (NULL, LOG_WARNING, |
| 1161 | "%s:%i Warning: Could not set netlink socket to blocking.", |
| 1162 | __FUNCTION__, __LINE__); |
| 718e3744 |
1163 | |
| 1164 | /* |
| 1165 | * Get reply from netlink socket. |
| 1166 | * The reply should either be an acknowlegement or an error. |
| 1167 | */ |
| 1168 | status = netlink_parse_info (netlink_talk_filter, nl); |
| 1169 | |
| 1170 | /* Restore socket flags for nonblocking I/O */ |
| 5f37d86f |
1171 | if(snb_ret == 0) |
| 1172 | set_netlink_nonblocking(nl, &flags); |
| 718e3744 |
1173 | |
| 1174 | return status; |
| 1175 | } |
| 1176 | |
| 1177 | /* Routing table change via netlink interface. */ |
| 1178 | int |
| 1179 | netlink_route (int cmd, int family, void *dest, int length, void *gate, |
| 1180 | int index, int zebra_flags, int table) |
| 1181 | { |
| 1182 | int ret; |
| 1183 | int bytelen; |
| 1184 | struct sockaddr_nl snl; |
| 1185 | int discard; |
| 1186 | |
| 1187 | struct |
| 1188 | { |
| 1189 | struct nlmsghdr n; |
| 1190 | struct rtmsg r; |
| 1191 | char buf[1024]; |
| 1192 | } req; |
| 1193 | |
| 1194 | memset (&req, 0, sizeof req); |
| 1195 | |
| 1196 | bytelen = (family == AF_INET ? 4 : 16); |
| 1197 | |
| 1198 | req.n.nlmsg_len = NLMSG_LENGTH (sizeof (struct rtmsg)); |
| 1199 | req.n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST; |
| 1200 | req.n.nlmsg_type = cmd; |
| 1201 | req.r.rtm_family = family; |
| 1202 | req.r.rtm_table = table; |
| 1203 | req.r.rtm_dst_len = length; |
| 1204 | |
| 81dfcaa2 |
1205 | if ((zebra_flags & ZEBRA_FLAG_BLACKHOLE) |
| 1206 | || (zebra_flags & ZEBRA_FLAG_REJECT)) |
| 718e3744 |
1207 | discard = 1; |
| 1208 | else |
| 1209 | discard = 0; |
| 1210 | |
| 1211 | if (cmd == RTM_NEWROUTE) |
| 1212 | { |
| 1213 | req.r.rtm_protocol = RTPROT_ZEBRA; |
| 1214 | req.r.rtm_scope = RT_SCOPE_UNIVERSE; |
| 1215 | |
| 595db7f1 |
1216 | if (discard) |
| 1217 | { |
| 1218 | if (zebra_flags & ZEBRA_FLAG_BLACKHOLE) |
| 1219 | req.r.rtm_type = RTN_BLACKHOLE; |
| 1220 | else if (zebra_flags & ZEBRA_FLAG_REJECT) |
| 1221 | req.r.rtm_type = RTN_UNREACHABLE; |
| 1222 | else assert(RTN_BLACKHOLE != RTN_UNREACHABLE); /* false */ |
| 1223 | } |
| 1224 | else |
| 1225 | req.r.rtm_type = RTN_UNICAST; |
| 718e3744 |
1226 | } |
| 1227 | |
| 1228 | if (dest) |
| 1229 | addattr_l (&req.n, sizeof req, RTA_DST, dest, bytelen); |
| 1230 | |
| 1231 | if (! discard) |
| 1232 | { |
| 1233 | if (gate) |
| 1234 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, gate, bytelen); |
| 1235 | if (index > 0) |
| 1236 | addattr32 (&req.n, sizeof req, RTA_OIF, index); |
| 1237 | } |
| 1238 | |
| 1239 | /* Destination netlink address. */ |
| 1240 | memset (&snl, 0, sizeof snl); |
| 1241 | snl.nl_family = AF_NETLINK; |
| 1242 | |
| 1243 | /* Talk to netlink socket. */ |
| 1244 | ret = netlink_talk (&req.n, &netlink); |
| 1245 | if (ret < 0) |
| 1246 | return -1; |
| 1247 | |
| 1248 | return 0; |
| 1249 | } |
| 1250 | |
| 1251 | /* Routing table change via netlink interface. */ |
| 1252 | int |
| 1253 | netlink_route_multipath (int cmd, struct prefix *p, struct rib *rib, |
| 1254 | int family) |
| 1255 | { |
| 1256 | int bytelen; |
| 1257 | struct sockaddr_nl snl; |
| 1258 | struct nexthop *nexthop = NULL; |
| 1259 | int nexthop_num = 0; |
| 1260 | struct nlsock *nl; |
| 1261 | int discard; |
| 1262 | |
| 1263 | struct |
| 1264 | { |
| 1265 | struct nlmsghdr n; |
| 1266 | struct rtmsg r; |
| 1267 | char buf[1024]; |
| 1268 | } req; |
| 1269 | |
| 1270 | memset (&req, 0, sizeof req); |
| 1271 | |
| 1272 | bytelen = (family == AF_INET ? 4 : 16); |
| 1273 | |
| 1274 | req.n.nlmsg_len = NLMSG_LENGTH (sizeof (struct rtmsg)); |
| 1275 | req.n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST; |
| 1276 | req.n.nlmsg_type = cmd; |
| 1277 | req.r.rtm_family = family; |
| 1278 | req.r.rtm_table = rib->table; |
| 1279 | req.r.rtm_dst_len = p->prefixlen; |
| 1280 | |
| 13766da4 |
1281 | #ifdef RTM_F_EQUALIZE |
| 1282 | req.r.rtm_flags |= RTM_F_EQUALIZE; |
| 1283 | #endif /* RTM_F_EQUALIZE */ |
| 1284 | |
| 81dfcaa2 |
1285 | if ((rib->flags & ZEBRA_FLAG_BLACKHOLE) |
| 1286 | || (rib->flags & ZEBRA_FLAG_REJECT)) |
| 718e3744 |
1287 | discard = 1; |
| 1288 | else |
| 1289 | discard = 0; |
| 1290 | |
| 1291 | if (cmd == RTM_NEWROUTE) |
| 1292 | { |
| 1293 | req.r.rtm_protocol = RTPROT_ZEBRA; |
| 1294 | req.r.rtm_scope = RT_SCOPE_UNIVERSE; |
| 1295 | |
| 595db7f1 |
1296 | if (discard) |
| 1297 | { |
| 1298 | if (rib->flags & ZEBRA_FLAG_BLACKHOLE) |
| 1299 | req.r.rtm_type = RTN_BLACKHOLE; |
| 1300 | else if (rib->flags & ZEBRA_FLAG_REJECT) |
| 1301 | req.r.rtm_type = RTN_UNREACHABLE; |
| 1302 | else assert(RTN_BLACKHOLE != RTN_UNREACHABLE); /* false */ |
| 1303 | } |
| 1304 | else |
| 1305 | req.r.rtm_type = RTN_UNICAST; |
| 718e3744 |
1306 | } |
| 1307 | |
| 1308 | addattr_l (&req.n, sizeof req, RTA_DST, &p->u.prefix, bytelen); |
| 1309 | |
| 1310 | /* Metric. */ |
| 1311 | addattr32 (&req.n, sizeof req, RTA_PRIORITY, rib->metric); |
| 1312 | |
| 1313 | if (discard) |
| 1314 | { |
| 1315 | if (cmd == RTM_NEWROUTE) |
| 1316 | for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next) |
| 1317 | SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB); |
| 1318 | goto skip; |
| 1319 | } |
| 1320 | |
| 1321 | /* Multipath case. */ |
| 1322 | if (rib->nexthop_active_num == 1 || MULTIPATH_NUM == 1) |
| 1323 | { |
| 1324 | for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next) |
| 1325 | { |
| 1326 | if ((cmd == RTM_NEWROUTE |
| 1327 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE)) |
| 1328 | || (cmd == RTM_DELROUTE |
| 1329 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB))) |
| 1330 | { |
| 1331 | if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE)) |
| 1332 | { |
| 1333 | if (nexthop->rtype == NEXTHOP_TYPE_IPV4 |
| 1334 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX) |
| 1335 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, |
| 1336 | &nexthop->rgate.ipv4, bytelen); |
| 1337 | #ifdef HAVE_IPV6 |
| 1338 | if (nexthop->rtype == NEXTHOP_TYPE_IPV6 |
| 1339 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX |
| 1340 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME) |
| 1341 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, |
| 1342 | &nexthop->rgate.ipv6, bytelen); |
| 1343 | #endif /* HAVE_IPV6 */ |
| 1344 | if (nexthop->rtype == NEXTHOP_TYPE_IFINDEX |
| 1345 | || nexthop->rtype == NEXTHOP_TYPE_IFNAME |
| 1346 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX |
| 1347 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX |
| 1348 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME) |
| 1349 | addattr32 (&req.n, sizeof req, RTA_OIF, |
| 1350 | nexthop->rifindex); |
| 1351 | } |
| 1352 | else |
| 1353 | { |
| 1354 | if (nexthop->type == NEXTHOP_TYPE_IPV4 |
| 1355 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) |
| 1356 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, |
| 1357 | &nexthop->gate.ipv4, bytelen); |
| 1358 | #ifdef HAVE_IPV6 |
| 1359 | if (nexthop->type == NEXTHOP_TYPE_IPV6 |
| 1360 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME |
| 1361 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) |
| 1362 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, |
| 1363 | &nexthop->gate.ipv6, bytelen); |
| 1364 | #endif /* HAVE_IPV6 */ |
| 1365 | if (nexthop->type == NEXTHOP_TYPE_IFINDEX |
| 1366 | || nexthop->type == NEXTHOP_TYPE_IFNAME |
| 1367 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX |
| 1368 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX |
| 1369 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME) |
| 1370 | addattr32 (&req.n, sizeof req, RTA_OIF, nexthop->ifindex); |
| 1371 | } |
| 1372 | |
| 1373 | if (cmd == RTM_NEWROUTE) |
| 1374 | SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB); |
| 1375 | |
| 1376 | nexthop_num++; |
| 1377 | break; |
| 1378 | } |
| 1379 | } |
| 1380 | } |
| 1381 | else |
| 1382 | { |
| 1383 | char buf[1024]; |
| 1384 | struct rtattr *rta = (void *) buf; |
| 1385 | struct rtnexthop *rtnh; |
| 1386 | |
| 1387 | rta->rta_type = RTA_MULTIPATH; |
| 1388 | rta->rta_len = RTA_LENGTH(0); |
| 1389 | rtnh = RTA_DATA(rta); |
| 1390 | |
| 1391 | nexthop_num = 0; |
| 1392 | for (nexthop = rib->nexthop; |
| 1393 | nexthop && (MULTIPATH_NUM == 0 || nexthop_num < MULTIPATH_NUM); |
| 1394 | nexthop = nexthop->next) |
| 1395 | { |
| 1396 | if ((cmd == RTM_NEWROUTE |
| 1397 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE)) |
| 1398 | || (cmd == RTM_DELROUTE |
| 1399 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB))) |
| 1400 | { |
| 1401 | nexthop_num++; |
| 1402 | |
| 1403 | rtnh->rtnh_len = sizeof (*rtnh); |
| 1404 | rtnh->rtnh_flags = 0; |
| 1405 | rtnh->rtnh_hops = 0; |
| 1406 | rta->rta_len += rtnh->rtnh_len; |
| 1407 | |
| 1408 | if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE)) |
| 1409 | { |
| 1410 | if (nexthop->rtype == NEXTHOP_TYPE_IPV4 |
| 1411 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX) |
| 1412 | { |
| 1413 | rta_addattr_l (rta, 4096, RTA_GATEWAY, |
| 1414 | &nexthop->rgate.ipv4, bytelen); |
| 1415 | rtnh->rtnh_len += sizeof (struct rtattr) + 4; |
| 1416 | } |
| 1417 | #ifdef HAVE_IPV6 |
| 1418 | if (nexthop->rtype == NEXTHOP_TYPE_IPV6 |
| 1419 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME |
| 1420 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX) |
| 1421 | rta_addattr_l (rta, 4096, RTA_GATEWAY, |
| 1422 | &nexthop->rgate.ipv6, bytelen); |
| 1423 | #endif /* HAVE_IPV6 */ |
| 1424 | /* ifindex */ |
| 1425 | if (nexthop->rtype == NEXTHOP_TYPE_IFINDEX |
| 1426 | || nexthop->rtype == NEXTHOP_TYPE_IFNAME |
| 1427 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX |
| 1428 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX |
| 1429 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME) |
| 1430 | rtnh->rtnh_ifindex = nexthop->rifindex; |
| 1431 | else |
| 1432 | rtnh->rtnh_ifindex = 0; |
| 1433 | } |
| 1434 | else |
| 1435 | { |
| 1436 | if (nexthop->type == NEXTHOP_TYPE_IPV4 |
| 1437 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) |
| 1438 | { |
| 1439 | rta_addattr_l (rta, 4096, RTA_GATEWAY, |
| 1440 | &nexthop->gate.ipv4, bytelen); |
| 1441 | rtnh->rtnh_len += sizeof (struct rtattr) + 4; |
| 1442 | } |
| 1443 | #ifdef HAVE_IPV6 |
| 1444 | if (nexthop->type == NEXTHOP_TYPE_IPV6 |
| 1445 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME |
| 1446 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) |
| 1447 | rta_addattr_l (rta, 4096, RTA_GATEWAY, |
| 1448 | &nexthop->gate.ipv6, bytelen); |
| 1449 | #endif /* HAVE_IPV6 */ |
| 1450 | /* ifindex */ |
| 1451 | if (nexthop->type == NEXTHOP_TYPE_IFINDEX |
| 1452 | || nexthop->type == NEXTHOP_TYPE_IFNAME |
| 1453 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX |
| 1454 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME |
| 1455 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) |
| 1456 | rtnh->rtnh_ifindex = nexthop->ifindex; |
| 1457 | else |
| 1458 | rtnh->rtnh_ifindex = 0; |
| 1459 | } |
| 1460 | rtnh = RTNH_NEXT(rtnh); |
| 1461 | |
| 1462 | if (cmd == RTM_NEWROUTE) |
| 1463 | SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB); |
| 1464 | } |
| 1465 | } |
| 1466 | |
| 1467 | if (rta->rta_len > RTA_LENGTH (0)) |
| 1468 | addattr_l (&req.n, 1024, RTA_MULTIPATH, RTA_DATA(rta), |
| 1469 | RTA_PAYLOAD(rta)); |
| 1470 | } |
| 1471 | |
| 1472 | /* If there is no useful nexthop then return. */ |
| 1473 | if (nexthop_num == 0) |
| 1474 | { |
| 1475 | if (IS_ZEBRA_DEBUG_KERNEL) |
| 1476 | zlog_info ("netlink_route_multipath(): No useful nexthop."); |
| 1477 | return 0; |
| 1478 | } |
| 1479 | |
| 1480 | skip: |
| 1481 | |
| 1482 | /* Destination netlink address. */ |
| 1483 | memset (&snl, 0, sizeof snl); |
| 1484 | snl.nl_family = AF_NETLINK; |
| 1485 | |
| 1486 | if (family == AF_INET) |
| 1487 | nl = &netlink_cmd; |
| 1488 | else |
| 1489 | nl = &netlink; |
| 1490 | |
| 1491 | /* Talk to netlink socket. */ |
| 1492 | return netlink_talk (&req.n, nl); |
| 1493 | } |
| 1494 | |
| 1495 | int |
| 1496 | kernel_add_ipv4 (struct prefix *p, struct rib *rib) |
| 1497 | { |
| 1498 | return netlink_route_multipath (RTM_NEWROUTE, p, rib, AF_INET); |
| 1499 | } |
| 1500 | |
| 1501 | int |
| 1502 | kernel_delete_ipv4 (struct prefix *p, struct rib *rib) |
| 1503 | { |
| 1504 | return netlink_route_multipath (RTM_DELROUTE, p, rib, AF_INET); |
| 1505 | } |
| 1506 | |
| 1507 | #ifdef HAVE_IPV6 |
| 1508 | int |
| 1509 | kernel_add_ipv6 (struct prefix *p, struct rib *rib) |
| 1510 | { |
| 1511 | return netlink_route_multipath (RTM_NEWROUTE, p, rib, AF_INET6); |
| 1512 | } |
| 1513 | |
| 1514 | int |
| 1515 | kernel_delete_ipv6 (struct prefix *p, struct rib *rib) |
| 1516 | { |
| 1517 | return netlink_route_multipath (RTM_DELROUTE, p, rib, AF_INET6); |
| 1518 | } |
| 1519 | |
| 1520 | /* Delete IPv6 route from the kernel. */ |
| 1521 | int |
| 1522 | kernel_delete_ipv6_old (struct prefix_ipv6 *dest, struct in6_addr *gate, |
| 1523 | int index, int flags, int table) |
| 1524 | { |
| 1525 | return netlink_route (RTM_DELROUTE, AF_INET6, &dest->prefix, dest->prefixlen, |
| 1526 | gate, index, flags, table); |
| 1527 | } |
| 1528 | #endif /* HAVE_IPV6 */ |
| 1529 | \f |
| 1530 | /* Interface address modification. */ |
| 1531 | int |
| 1532 | netlink_address (int cmd, int family, struct interface *ifp, |
| 1533 | struct connected *ifc) |
| 1534 | { |
| 1535 | int bytelen; |
| 1536 | struct prefix *p; |
| 1537 | |
| 1538 | struct |
| 1539 | { |
| 1540 | struct nlmsghdr n; |
| 1541 | struct ifaddrmsg ifa; |
| 1542 | char buf[1024]; |
| 1543 | } req; |
| 1544 | |
| 1545 | p = ifc->address; |
| 1546 | memset (&req, 0, sizeof req); |
| 1547 | |
| 1548 | bytelen = (family == AF_INET ? 4 : 16); |
| 1549 | |
| 1550 | req.n.nlmsg_len = NLMSG_LENGTH (sizeof(struct ifaddrmsg)); |
| 1551 | req.n.nlmsg_flags = NLM_F_REQUEST; |
| 1552 | req.n.nlmsg_type = cmd; |
| 1553 | req.ifa.ifa_family = family; |
| 1554 | |
| 1555 | req.ifa.ifa_index = ifp->ifindex; |
| 1556 | req.ifa.ifa_prefixlen = p->prefixlen; |
| 1557 | |
| 1558 | addattr_l (&req.n, sizeof req, IFA_LOCAL, &p->u.prefix, bytelen); |
| 1559 | |
| 1560 | if (family == AF_INET && cmd == RTM_NEWADDR) |
| 1561 | { |
| 1562 | if (if_is_broadcast (ifp) && ifc->destination) |
| 1563 | { |
| 1564 | p = ifc->destination; |
| 1565 | addattr_l(&req.n, sizeof req, IFA_BROADCAST, &p->u.prefix, bytelen); |
| 1566 | } |
| 1567 | } |
| 1568 | |
| 1569 | if (CHECK_FLAG (ifc->flags, ZEBRA_IFA_SECONDARY)) |
| 1570 | SET_FLAG (req.ifa.ifa_flags, IFA_F_SECONDARY); |
| 1571 | |
| 1572 | if (ifc->label) |
| 1573 | addattr_l (&req.n, sizeof req, IFA_LABEL, ifc->label, |
| 1574 | strlen (ifc->label) + 1); |
| 1575 | |
| 1576 | return netlink_talk (&req.n, &netlink_cmd); |
| 1577 | } |
| 1578 | |
| 1579 | int |
| 1580 | kernel_address_add_ipv4 (struct interface *ifp, struct connected *ifc) |
| 1581 | { |
| 1582 | return netlink_address (RTM_NEWADDR, AF_INET, ifp, ifc); |
| 1583 | } |
| 1584 | |
| 1585 | int |
| 1586 | kernel_address_delete_ipv4 (struct interface *ifp, struct connected *ifc) |
| 1587 | { |
| 1588 | return netlink_address (RTM_DELADDR, AF_INET, ifp, ifc); |
| 1589 | } |
| 1590 | |
| 718e3744 |
1591 | |
| 1592 | extern struct thread_master *master; |
| 1593 | |
| 1594 | /* Kernel route reflection. */ |
| 1595 | int |
| 1596 | kernel_read (struct thread *thread) |
| 1597 | { |
| 1598 | int ret; |
| 1599 | int sock; |
| 1600 | |
| 1601 | sock = THREAD_FD (thread); |
| 1602 | ret = netlink_parse_info (netlink_information_fetch, &netlink); |
| 1603 | thread_add_read (master, kernel_read, NULL, netlink.sock); |
| 1604 | |
| 1605 | return 0; |
| 1606 | } |
| 1607 | |
| 1608 | /* Exported interface function. This function simply calls |
| 1609 | netlink_socket (). */ |
| 1610 | void |
| 1611 | kernel_init () |
| 1612 | { |
| 1613 | unsigned long groups; |
| 1614 | |
| 1615 | groups = RTMGRP_LINK|RTMGRP_IPV4_ROUTE|RTMGRP_IPV4_IFADDR; |
| 1616 | #ifdef HAVE_IPV6 |
| 1617 | groups |= RTMGRP_IPV6_ROUTE|RTMGRP_IPV6_IFADDR; |
| 1618 | #endif /* HAVE_IPV6 */ |
| 1619 | netlink_socket (&netlink, groups); |
| 1620 | netlink_socket (&netlink_cmd, 0); |
| 1621 | |
| 1622 | /* Register kernel socket. */ |
| 1623 | if (netlink.sock > 0) |
| 1624 | thread_add_read (master, kernel_read, NULL, netlink.sock); |
| 1625 | } |
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