Annotation of embedaddon/bird2/sysdep/linux/netlink.c, revision 1.1
1.1 ! misho 1: /*
! 2: * BIRD -- Linux Netlink Interface
! 3: *
! 4: * (c) 1999--2000 Martin Mares <mj@ucw.cz>
! 5: *
! 6: * Can be freely distributed and used under the terms of the GNU GPL.
! 7: */
! 8:
! 9: #include <alloca.h>
! 10: #include <stdio.h>
! 11: #include <unistd.h>
! 12: #include <fcntl.h>
! 13: #include <sys/socket.h>
! 14: #include <sys/uio.h>
! 15: #include <errno.h>
! 16:
! 17: #undef LOCAL_DEBUG
! 18:
! 19: #include "nest/bird.h"
! 20: #include "nest/route.h"
! 21: #include "nest/protocol.h"
! 22: #include "nest/iface.h"
! 23: #include "lib/alloca.h"
! 24: #include "sysdep/unix/unix.h"
! 25: #include "sysdep/unix/krt.h"
! 26: #include "lib/socket.h"
! 27: #include "lib/string.h"
! 28: #include "lib/hash.h"
! 29: #include "conf/conf.h"
! 30:
! 31: #include <asm/types.h>
! 32: #include <linux/if.h>
! 33: #include <linux/netlink.h>
! 34: #include <linux/rtnetlink.h>
! 35:
! 36: #ifdef HAVE_MPLS_KERNEL
! 37: #include <linux/lwtunnel.h>
! 38: #endif
! 39:
! 40: #ifndef MSG_TRUNC /* Hack: Several versions of glibc miss this one :( */
! 41: #define MSG_TRUNC 0x20
! 42: #endif
! 43:
! 44: #ifndef IFA_FLAGS
! 45: #define IFA_FLAGS 8
! 46: #endif
! 47:
! 48: #ifndef IFF_LOWER_UP
! 49: #define IFF_LOWER_UP 0x10000
! 50: #endif
! 51:
! 52: #ifndef RTA_TABLE
! 53: #define RTA_TABLE 15
! 54: #endif
! 55:
! 56: #ifndef RTA_VIA
! 57: #define RTA_VIA 18
! 58: #endif
! 59:
! 60: #ifndef RTA_NEWDST
! 61: #define RTA_NEWDST 19
! 62: #endif
! 63:
! 64: #ifndef RTA_ENCAP_TYPE
! 65: #define RTA_ENCAP_TYPE 21
! 66: #endif
! 67:
! 68: #ifndef RTA_ENCAP
! 69: #define RTA_ENCAP 22
! 70: #endif
! 71:
! 72: #define krt_ipv4(p) ((p)->af == AF_INET)
! 73: #define krt_ecmp6(p) ((p)->af == AF_INET6)
! 74:
! 75: const int rt_default_ecmp = 16;
! 76:
! 77: /*
! 78: * Structure nl_parse_state keeps state of received route processing. Ideally,
! 79: * we could just independently parse received Netlink messages and immediately
! 80: * propagate received routes to the rest of BIRD, but older Linux kernel (before
! 81: * version 4.11) represents and announces IPv6 ECMP routes not as one route with
! 82: * multiple next hops (like RTA_MULTIPATH in IPv4 ECMP), but as a sequence of
! 83: * routes with the same prefix. More recent kernels work as with IPv4.
! 84: *
! 85: * Therefore, BIRD keeps currently processed route in nl_parse_state structure
! 86: * and postpones its propagation until we expect it to be final; i.e., when
! 87: * non-matching route is received or when the scan ends. When another matching
! 88: * route is received, it is merged with the already processed route to form an
! 89: * ECMP route. Note that merging is done only for IPv6 (merge == 1), but the
! 90: * postponing is done in both cases (for simplicity). All IPv4 routes or IPv6
! 91: * routes with RTA_MULTIPATH set are just considered non-matching.
! 92: *
! 93: * This is ignored for asynchronous notifications (every notification is handled
! 94: * as a separate route). It is not an issue for our routes, as we ignore such
! 95: * notifications anyways. But importing alien IPv6 ECMP routes does not work
! 96: * properly with older kernels.
! 97: *
! 98: * Whatever the kernel version is, IPv6 ECMP routes are sent as multiple routes
! 99: * for the same prefix.
! 100: */
! 101:
! 102: struct nl_parse_state
! 103: {
! 104: struct linpool *pool;
! 105: int scan;
! 106: int merge;
! 107:
! 108: net *net;
! 109: rta *attrs;
! 110: struct krt_proto *proto;
! 111: s8 new;
! 112: s8 krt_src;
! 113: u8 krt_type;
! 114: u8 krt_proto;
! 115: u32 krt_metric;
! 116: };
! 117:
! 118: /*
! 119: * Synchronous Netlink interface
! 120: */
! 121:
! 122: struct nl_sock
! 123: {
! 124: int fd;
! 125: u32 seq;
! 126: byte *rx_buffer; /* Receive buffer */
! 127: struct nlmsghdr *last_hdr; /* Recently received packet */
! 128: uint last_size;
! 129: };
! 130:
! 131: #define NL_RX_SIZE 8192
! 132:
! 133: #define NL_OP_DELETE 0
! 134: #define NL_OP_ADD (NLM_F_CREATE|NLM_F_EXCL)
! 135: #define NL_OP_REPLACE (NLM_F_CREATE|NLM_F_REPLACE)
! 136: #define NL_OP_APPEND (NLM_F_CREATE|NLM_F_APPEND)
! 137:
! 138: static linpool *nl_linpool;
! 139:
! 140: static struct nl_sock nl_scan = {.fd = -1}; /* Netlink socket for synchronous scan */
! 141: static struct nl_sock nl_req = {.fd = -1}; /* Netlink socket for requests */
! 142:
! 143: static void
! 144: nl_open_sock(struct nl_sock *nl)
! 145: {
! 146: if (nl->fd < 0)
! 147: {
! 148: nl->fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
! 149: if (nl->fd < 0)
! 150: die("Unable to open rtnetlink socket: %m");
! 151: nl->seq = (u32) (current_time() TO_S); /* Or perhaps random_u32() ? */
! 152: nl->rx_buffer = xmalloc(NL_RX_SIZE);
! 153: nl->last_hdr = NULL;
! 154: nl->last_size = 0;
! 155: }
! 156: }
! 157:
! 158: static void
! 159: nl_open(void)
! 160: {
! 161: nl_open_sock(&nl_scan);
! 162: nl_open_sock(&nl_req);
! 163: }
! 164:
! 165: static void
! 166: nl_send(struct nl_sock *nl, struct nlmsghdr *nh)
! 167: {
! 168: struct sockaddr_nl sa;
! 169:
! 170: memset(&sa, 0, sizeof(sa));
! 171: sa.nl_family = AF_NETLINK;
! 172: nh->nlmsg_pid = 0;
! 173: nh->nlmsg_seq = ++(nl->seq);
! 174: if (sendto(nl->fd, nh, nh->nlmsg_len, 0, (struct sockaddr *)&sa, sizeof(sa)) < 0)
! 175: die("rtnetlink sendto: %m");
! 176: nl->last_hdr = NULL;
! 177: }
! 178:
! 179: static void
! 180: nl_request_dump(int af, int cmd)
! 181: {
! 182: struct {
! 183: struct nlmsghdr nh;
! 184: struct rtgenmsg g;
! 185: } req = {
! 186: .nh.nlmsg_type = cmd,
! 187: .nh.nlmsg_len = sizeof(req),
! 188: .nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP,
! 189: .g.rtgen_family = af
! 190: };
! 191: nl_send(&nl_scan, &req.nh);
! 192: }
! 193:
! 194: static struct nlmsghdr *
! 195: nl_get_reply(struct nl_sock *nl)
! 196: {
! 197: for(;;)
! 198: {
! 199: if (!nl->last_hdr)
! 200: {
! 201: struct iovec iov = { nl->rx_buffer, NL_RX_SIZE };
! 202: struct sockaddr_nl sa;
! 203: struct msghdr m = {
! 204: .msg_name = &sa,
! 205: .msg_namelen = sizeof(sa),
! 206: .msg_iov = &iov,
! 207: .msg_iovlen = 1,
! 208: };
! 209: int x = recvmsg(nl->fd, &m, 0);
! 210: if (x < 0)
! 211: die("nl_get_reply: %m");
! 212: if (sa.nl_pid) /* It isn't from the kernel */
! 213: {
! 214: DBG("Non-kernel packet\n");
! 215: continue;
! 216: }
! 217: nl->last_size = x;
! 218: nl->last_hdr = (void *) nl->rx_buffer;
! 219: if (m.msg_flags & MSG_TRUNC)
! 220: bug("nl_get_reply: got truncated reply which should be impossible");
! 221: }
! 222: if (NLMSG_OK(nl->last_hdr, nl->last_size))
! 223: {
! 224: struct nlmsghdr *h = nl->last_hdr;
! 225: nl->last_hdr = NLMSG_NEXT(h, nl->last_size);
! 226: if (h->nlmsg_seq != nl->seq)
! 227: {
! 228: log(L_WARN "nl_get_reply: Ignoring out of sequence netlink packet (%x != %x)",
! 229: h->nlmsg_seq, nl->seq);
! 230: continue;
! 231: }
! 232: return h;
! 233: }
! 234: if (nl->last_size)
! 235: log(L_WARN "nl_get_reply: Found packet remnant of size %d", nl->last_size);
! 236: nl->last_hdr = NULL;
! 237: }
! 238: }
! 239:
! 240: static struct tbf rl_netlink_err = TBF_DEFAULT_LOG_LIMITS;
! 241:
! 242: static int
! 243: nl_error(struct nlmsghdr *h, int ignore_esrch)
! 244: {
! 245: struct nlmsgerr *e;
! 246: int ec;
! 247:
! 248: if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
! 249: {
! 250: log(L_WARN "Netlink: Truncated error message received");
! 251: return ENOBUFS;
! 252: }
! 253: e = (struct nlmsgerr *) NLMSG_DATA(h);
! 254: ec = -e->error;
! 255: if (ec && !(ignore_esrch && (ec == ESRCH)))
! 256: log_rl(&rl_netlink_err, L_WARN "Netlink: %s", strerror(ec));
! 257: return ec;
! 258: }
! 259:
! 260: static struct nlmsghdr *
! 261: nl_get_scan(void)
! 262: {
! 263: struct nlmsghdr *h = nl_get_reply(&nl_scan);
! 264:
! 265: if (h->nlmsg_type == NLMSG_DONE)
! 266: return NULL;
! 267: if (h->nlmsg_type == NLMSG_ERROR)
! 268: {
! 269: nl_error(h, 0);
! 270: return NULL;
! 271: }
! 272: return h;
! 273: }
! 274:
! 275: static int
! 276: nl_exchange(struct nlmsghdr *pkt, int ignore_esrch)
! 277: {
! 278: struct nlmsghdr *h;
! 279:
! 280: nl_send(&nl_req, pkt);
! 281: for(;;)
! 282: {
! 283: h = nl_get_reply(&nl_req);
! 284: if (h->nlmsg_type == NLMSG_ERROR)
! 285: break;
! 286: log(L_WARN "nl_exchange: Unexpected reply received");
! 287: }
! 288: return nl_error(h, ignore_esrch) ? -1 : 0;
! 289: }
! 290:
! 291: /*
! 292: * Netlink attributes
! 293: */
! 294:
! 295: static int nl_attr_len;
! 296:
! 297: static void *
! 298: nl_checkin(struct nlmsghdr *h, int lsize)
! 299: {
! 300: nl_attr_len = h->nlmsg_len - NLMSG_LENGTH(lsize);
! 301: if (nl_attr_len < 0)
! 302: {
! 303: log(L_ERR "nl_checkin: underrun by %d bytes", -nl_attr_len);
! 304: return NULL;
! 305: }
! 306: return NLMSG_DATA(h);
! 307: }
! 308:
! 309: struct nl_want_attrs {
! 310: u8 defined:1;
! 311: u8 checksize:1;
! 312: u8 size;
! 313: };
! 314:
! 315:
! 316: #define BIRD_IFLA_MAX (IFLA_WIRELESS+1)
! 317:
! 318: static struct nl_want_attrs ifla_attr_want[BIRD_IFLA_MAX] = {
! 319: [IFLA_IFNAME] = { 1, 0, 0 },
! 320: [IFLA_MTU] = { 1, 1, sizeof(u32) },
! 321: [IFLA_MASTER] = { 1, 1, sizeof(u32) },
! 322: [IFLA_WIRELESS] = { 1, 0, 0 },
! 323: };
! 324:
! 325:
! 326: #define BIRD_IFA_MAX (IFA_FLAGS+1)
! 327:
! 328: static struct nl_want_attrs ifa_attr_want4[BIRD_IFA_MAX] = {
! 329: [IFA_ADDRESS] = { 1, 1, sizeof(ip4_addr) },
! 330: [IFA_LOCAL] = { 1, 1, sizeof(ip4_addr) },
! 331: [IFA_BROADCAST] = { 1, 1, sizeof(ip4_addr) },
! 332: [IFA_FLAGS] = { 1, 1, sizeof(u32) },
! 333: };
! 334:
! 335: static struct nl_want_attrs ifa_attr_want6[BIRD_IFA_MAX] = {
! 336: [IFA_ADDRESS] = { 1, 1, sizeof(ip6_addr) },
! 337: [IFA_LOCAL] = { 1, 1, sizeof(ip6_addr) },
! 338: [IFA_FLAGS] = { 1, 1, sizeof(u32) },
! 339: };
! 340:
! 341:
! 342: #define BIRD_RTA_MAX (RTA_ENCAP+1)
! 343:
! 344: static struct nl_want_attrs nexthop_attr_want4[BIRD_RTA_MAX] = {
! 345: [RTA_GATEWAY] = { 1, 1, sizeof(ip4_addr) },
! 346: [RTA_ENCAP_TYPE]= { 1, 1, sizeof(u16) },
! 347: [RTA_ENCAP] = { 1, 0, 0 },
! 348: };
! 349:
! 350: static struct nl_want_attrs nexthop_attr_want6[BIRD_RTA_MAX] = {
! 351: [RTA_GATEWAY] = { 1, 1, sizeof(ip6_addr) },
! 352: [RTA_ENCAP_TYPE]= { 1, 1, sizeof(u16) },
! 353: [RTA_ENCAP] = { 1, 0, 0 },
! 354: };
! 355:
! 356: #ifdef HAVE_MPLS_KERNEL
! 357: static struct nl_want_attrs encap_mpls_want[BIRD_RTA_MAX] = {
! 358: [RTA_DST] = { 1, 0, 0 },
! 359: };
! 360: #endif
! 361:
! 362: static struct nl_want_attrs rtm_attr_want4[BIRD_RTA_MAX] = {
! 363: [RTA_DST] = { 1, 1, sizeof(ip4_addr) },
! 364: [RTA_OIF] = { 1, 1, sizeof(u32) },
! 365: [RTA_GATEWAY] = { 1, 1, sizeof(ip4_addr) },
! 366: [RTA_PRIORITY] = { 1, 1, sizeof(u32) },
! 367: [RTA_PREFSRC] = { 1, 1, sizeof(ip4_addr) },
! 368: [RTA_METRICS] = { 1, 0, 0 },
! 369: [RTA_MULTIPATH] = { 1, 0, 0 },
! 370: [RTA_FLOW] = { 1, 1, sizeof(u32) },
! 371: [RTA_TABLE] = { 1, 1, sizeof(u32) },
! 372: [RTA_ENCAP_TYPE]= { 1, 1, sizeof(u16) },
! 373: [RTA_ENCAP] = { 1, 0, 0 },
! 374: };
! 375:
! 376: static struct nl_want_attrs rtm_attr_want6[BIRD_RTA_MAX] = {
! 377: [RTA_DST] = { 1, 1, sizeof(ip6_addr) },
! 378: [RTA_SRC] = { 1, 1, sizeof(ip6_addr) },
! 379: [RTA_IIF] = { 1, 1, sizeof(u32) },
! 380: [RTA_OIF] = { 1, 1, sizeof(u32) },
! 381: [RTA_GATEWAY] = { 1, 1, sizeof(ip6_addr) },
! 382: [RTA_PRIORITY] = { 1, 1, sizeof(u32) },
! 383: [RTA_PREFSRC] = { 1, 1, sizeof(ip6_addr) },
! 384: [RTA_METRICS] = { 1, 0, 0 },
! 385: [RTA_MULTIPATH] = { 1, 0, 0 },
! 386: [RTA_FLOW] = { 1, 1, sizeof(u32) },
! 387: [RTA_TABLE] = { 1, 1, sizeof(u32) },
! 388: [RTA_ENCAP_TYPE]= { 1, 1, sizeof(u16) },
! 389: [RTA_ENCAP] = { 1, 0, 0 },
! 390: };
! 391:
! 392: #ifdef HAVE_MPLS_KERNEL
! 393: static struct nl_want_attrs rtm_attr_want_mpls[BIRD_RTA_MAX] = {
! 394: [RTA_DST] = { 1, 1, sizeof(u32) },
! 395: [RTA_IIF] = { 1, 1, sizeof(u32) },
! 396: [RTA_OIF] = { 1, 1, sizeof(u32) },
! 397: [RTA_PRIORITY] = { 1, 1, sizeof(u32) },
! 398: [RTA_METRICS] = { 1, 0, 0 },
! 399: [RTA_FLOW] = { 1, 1, sizeof(u32) },
! 400: [RTA_TABLE] = { 1, 1, sizeof(u32) },
! 401: [RTA_VIA] = { 1, 0, 0 },
! 402: [RTA_NEWDST] = { 1, 0, 0 },
! 403: };
! 404: #endif
! 405:
! 406:
! 407: static int
! 408: nl_parse_attrs(struct rtattr *a, struct nl_want_attrs *want, struct rtattr **k, int ksize)
! 409: {
! 410: int max = ksize / sizeof(struct rtattr *);
! 411: bzero(k, ksize);
! 412:
! 413: for ( ; RTA_OK(a, nl_attr_len); a = RTA_NEXT(a, nl_attr_len))
! 414: {
! 415: if ((a->rta_type >= max) || !want[a->rta_type].defined)
! 416: continue;
! 417:
! 418: if (want[a->rta_type].checksize && (RTA_PAYLOAD(a) != want[a->rta_type].size))
! 419: {
! 420: log(L_ERR "nl_parse_attrs: Malformed attribute received");
! 421: return 0;
! 422: }
! 423:
! 424: k[a->rta_type] = a;
! 425: }
! 426:
! 427: if (nl_attr_len)
! 428: {
! 429: log(L_ERR "nl_parse_attrs: remnant of size %d", nl_attr_len);
! 430: return 0;
! 431: }
! 432:
! 433: return 1;
! 434: }
! 435:
! 436: static inline u16 rta_get_u16(struct rtattr *a)
! 437: { return *(u16 *) RTA_DATA(a); }
! 438:
! 439: static inline u32 rta_get_u32(struct rtattr *a)
! 440: { return *(u32 *) RTA_DATA(a); }
! 441:
! 442: static inline ip4_addr rta_get_ip4(struct rtattr *a)
! 443: { return ip4_ntoh(*(ip4_addr *) RTA_DATA(a)); }
! 444:
! 445: static inline ip6_addr rta_get_ip6(struct rtattr *a)
! 446: { return ip6_ntoh(*(ip6_addr *) RTA_DATA(a)); }
! 447:
! 448: static inline ip_addr rta_get_ipa(struct rtattr *a)
! 449: {
! 450: if (RTA_PAYLOAD(a) == sizeof(ip4_addr))
! 451: return ipa_from_ip4(rta_get_ip4(a));
! 452: else
! 453: return ipa_from_ip6(rta_get_ip6(a));
! 454: }
! 455:
! 456: #ifdef HAVE_MPLS_KERNEL
! 457: static inline ip_addr rta_get_via(struct rtattr *a)
! 458: {
! 459: struct rtvia *v = RTA_DATA(a);
! 460: switch(v->rtvia_family) {
! 461: case AF_INET: return ipa_from_ip4(ip4_ntoh(*(ip4_addr *) v->rtvia_addr));
! 462: case AF_INET6: return ipa_from_ip6(ip6_ntoh(*(ip6_addr *) v->rtvia_addr));
! 463: }
! 464: return IPA_NONE;
! 465: }
! 466:
! 467: static u32 rta_mpls_stack[MPLS_MAX_LABEL_STACK];
! 468: static inline int rta_get_mpls(struct rtattr *a, u32 *stack)
! 469: {
! 470: if (!a)
! 471: return 0;
! 472:
! 473: if (RTA_PAYLOAD(a) % 4)
! 474: log(L_WARN "KRT: Strange length of received MPLS stack: %u", RTA_PAYLOAD(a));
! 475:
! 476: int labels = mpls_get(RTA_DATA(a), RTA_PAYLOAD(a) & ~0x3, stack);
! 477:
! 478: if (labels < 0)
! 479: {
! 480: log(L_WARN "KRT: Too long MPLS stack received, ignoring");
! 481: labels = 0;
! 482: }
! 483:
! 484: return labels;
! 485: }
! 486: #endif
! 487:
! 488: struct rtattr *
! 489: nl_add_attr(struct nlmsghdr *h, uint bufsize, uint code, const void *data, uint dlen)
! 490: {
! 491: uint pos = NLMSG_ALIGN(h->nlmsg_len);
! 492: uint len = RTA_LENGTH(dlen);
! 493:
! 494: if (pos + len > bufsize)
! 495: bug("nl_add_attr: packet buffer overflow");
! 496:
! 497: struct rtattr *a = (struct rtattr *)((char *)h + pos);
! 498: a->rta_type = code;
! 499: a->rta_len = len;
! 500: h->nlmsg_len = pos + len;
! 501:
! 502: if (dlen > 0)
! 503: memcpy(RTA_DATA(a), data, dlen);
! 504:
! 505: return a;
! 506: }
! 507:
! 508: static inline struct rtattr *
! 509: nl_open_attr(struct nlmsghdr *h, uint bufsize, uint code)
! 510: {
! 511: return nl_add_attr(h, bufsize, code, NULL, 0);
! 512: }
! 513:
! 514: static inline void
! 515: nl_close_attr(struct nlmsghdr *h, struct rtattr *a)
! 516: {
! 517: a->rta_len = (void *)h + NLMSG_ALIGN(h->nlmsg_len) - (void *)a;
! 518: }
! 519:
! 520: static inline void
! 521: nl_add_attr_u16(struct nlmsghdr *h, uint bufsize, int code, u16 data)
! 522: {
! 523: nl_add_attr(h, bufsize, code, &data, 2);
! 524: }
! 525:
! 526: static inline void
! 527: nl_add_attr_u32(struct nlmsghdr *h, uint bufsize, int code, u32 data)
! 528: {
! 529: nl_add_attr(h, bufsize, code, &data, 4);
! 530: }
! 531:
! 532: static inline void
! 533: nl_add_attr_ip4(struct nlmsghdr *h, uint bufsize, int code, ip4_addr ip4)
! 534: {
! 535: ip4 = ip4_hton(ip4);
! 536: nl_add_attr(h, bufsize, code, &ip4, sizeof(ip4));
! 537: }
! 538:
! 539: static inline void
! 540: nl_add_attr_ip6(struct nlmsghdr *h, uint bufsize, int code, ip6_addr ip6)
! 541: {
! 542: ip6 = ip6_hton(ip6);
! 543: nl_add_attr(h, bufsize, code, &ip6, sizeof(ip6));
! 544: }
! 545:
! 546: static inline void
! 547: nl_add_attr_ipa(struct nlmsghdr *h, uint bufsize, int code, ip_addr ipa)
! 548: {
! 549: if (ipa_is_ip4(ipa))
! 550: nl_add_attr_ip4(h, bufsize, code, ipa_to_ip4(ipa));
! 551: else
! 552: nl_add_attr_ip6(h, bufsize, code, ipa_to_ip6(ipa));
! 553: }
! 554:
! 555: #ifdef HAVE_MPLS_KERNEL
! 556: static inline void
! 557: nl_add_attr_mpls(struct nlmsghdr *h, uint bufsize, int code, int len, u32 *stack)
! 558: {
! 559: char buf[len*4];
! 560: mpls_put(buf, len, stack);
! 561: nl_add_attr(h, bufsize, code, buf, len*4);
! 562: }
! 563:
! 564: static inline void
! 565: nl_add_attr_mpls_encap(struct nlmsghdr *h, uint bufsize, int len, u32 *stack)
! 566: {
! 567: nl_add_attr_u16(h, bufsize, RTA_ENCAP_TYPE, LWTUNNEL_ENCAP_MPLS);
! 568:
! 569: struct rtattr *nest = nl_open_attr(h, bufsize, RTA_ENCAP);
! 570: nl_add_attr_mpls(h, bufsize, RTA_DST, len, stack);
! 571: nl_close_attr(h, nest);
! 572: }
! 573:
! 574: static inline void
! 575: nl_add_attr_via(struct nlmsghdr *h, uint bufsize, ip_addr ipa)
! 576: {
! 577: struct rtvia *via = alloca(sizeof(struct rtvia) + 16);
! 578:
! 579: if (ipa_is_ip4(ipa))
! 580: {
! 581: via->rtvia_family = AF_INET;
! 582: put_ip4(via->rtvia_addr, ipa_to_ip4(ipa));
! 583: nl_add_attr(h, bufsize, RTA_VIA, via, sizeof(struct rtvia) + 4);
! 584: }
! 585: else
! 586: {
! 587: via->rtvia_family = AF_INET6;
! 588: put_ip6(via->rtvia_addr, ipa_to_ip6(ipa));
! 589: nl_add_attr(h, bufsize, RTA_VIA, via, sizeof(struct rtvia) + 16);
! 590: }
! 591: }
! 592: #endif
! 593:
! 594: static inline struct rtnexthop *
! 595: nl_open_nexthop(struct nlmsghdr *h, uint bufsize)
! 596: {
! 597: uint pos = NLMSG_ALIGN(h->nlmsg_len);
! 598: uint len = RTNH_LENGTH(0);
! 599:
! 600: if (pos + len > bufsize)
! 601: bug("nl_open_nexthop: packet buffer overflow");
! 602:
! 603: h->nlmsg_len = pos + len;
! 604:
! 605: return (void *)h + pos;
! 606: }
! 607:
! 608: static inline void
! 609: nl_close_nexthop(struct nlmsghdr *h, struct rtnexthop *nh)
! 610: {
! 611: nh->rtnh_len = (void *)h + NLMSG_ALIGN(h->nlmsg_len) - (void *)nh;
! 612: }
! 613:
! 614: static inline void
! 615: nl_add_nexthop(struct nlmsghdr *h, uint bufsize, struct nexthop *nh, int af UNUSED)
! 616: {
! 617: #ifdef HAVE_MPLS_KERNEL
! 618: if (nh->labels > 0)
! 619: if (af == AF_MPLS)
! 620: nl_add_attr_mpls(h, bufsize, RTA_NEWDST, nh->labels, nh->label);
! 621: else
! 622: nl_add_attr_mpls_encap(h, bufsize, nh->labels, nh->label);
! 623:
! 624: if (ipa_nonzero(nh->gw))
! 625: if (af == AF_MPLS)
! 626: nl_add_attr_via(h, bufsize, nh->gw);
! 627: else
! 628: nl_add_attr_ipa(h, bufsize, RTA_GATEWAY, nh->gw);
! 629: #else
! 630:
! 631: if (ipa_nonzero(nh->gw))
! 632: nl_add_attr_ipa(h, bufsize, RTA_GATEWAY, nh->gw);
! 633: #endif
! 634: }
! 635:
! 636: static void
! 637: nl_add_multipath(struct nlmsghdr *h, uint bufsize, struct nexthop *nh, int af)
! 638: {
! 639: struct rtattr *a = nl_open_attr(h, bufsize, RTA_MULTIPATH);
! 640:
! 641: for (; nh; nh = nh->next)
! 642: {
! 643: struct rtnexthop *rtnh = nl_open_nexthop(h, bufsize);
! 644:
! 645: rtnh->rtnh_flags = 0;
! 646: rtnh->rtnh_hops = nh->weight;
! 647: rtnh->rtnh_ifindex = nh->iface->index;
! 648:
! 649: nl_add_nexthop(h, bufsize, nh, af);
! 650:
! 651: if (nh->flags & RNF_ONLINK)
! 652: rtnh->rtnh_flags |= RTNH_F_ONLINK;
! 653:
! 654: nl_close_nexthop(h, rtnh);
! 655: }
! 656:
! 657: nl_close_attr(h, a);
! 658: }
! 659:
! 660: static struct nexthop *
! 661: nl_parse_multipath(struct nl_parse_state *s, struct krt_proto *p, struct rtattr *ra, int af)
! 662: {
! 663: struct rtattr *a[BIRD_RTA_MAX];
! 664: struct rtnexthop *nh = RTA_DATA(ra);
! 665: struct nexthop *rv, *first, **last;
! 666: unsigned len = RTA_PAYLOAD(ra);
! 667:
! 668: first = NULL;
! 669: last = &first;
! 670:
! 671: while (len)
! 672: {
! 673: /* Use RTNH_OK(nh,len) ?? */
! 674: if ((len < sizeof(*nh)) || (len < nh->rtnh_len))
! 675: return NULL;
! 676:
! 677: *last = rv = lp_allocz(s->pool, NEXTHOP_MAX_SIZE);
! 678: last = &(rv->next);
! 679:
! 680: rv->weight = nh->rtnh_hops;
! 681: rv->iface = if_find_by_index(nh->rtnh_ifindex);
! 682: if (!rv->iface)
! 683: return NULL;
! 684:
! 685: /* Nonexistent RTNH_PAYLOAD ?? */
! 686: nl_attr_len = nh->rtnh_len - RTNH_LENGTH(0);
! 687: switch (af)
! 688: {
! 689: case AF_INET:
! 690: if (!nl_parse_attrs(RTNH_DATA(nh), nexthop_attr_want4, a, sizeof(a)))
! 691: return NULL;
! 692: break;
! 693:
! 694: case AF_INET6:
! 695: if (!nl_parse_attrs(RTNH_DATA(nh), nexthop_attr_want6, a, sizeof(a)))
! 696: return NULL;
! 697: break;
! 698:
! 699: default:
! 700: return NULL;
! 701: }
! 702:
! 703: if (a[RTA_GATEWAY])
! 704: {
! 705: rv->gw = rta_get_ipa(a[RTA_GATEWAY]);
! 706:
! 707: if (nh->rtnh_flags & RTNH_F_ONLINK)
! 708: rv->flags |= RNF_ONLINK;
! 709:
! 710: neighbor *nbr;
! 711: nbr = neigh_find(&p->p, rv->gw, rv->iface,
! 712: (rv->flags & RNF_ONLINK) ? NEF_ONLINK : 0);
! 713: if (!nbr || (nbr->scope == SCOPE_HOST))
! 714: return NULL;
! 715: }
! 716: else
! 717: rv->gw = IPA_NONE;
! 718:
! 719: #ifdef HAVE_MPLS_KERNEL
! 720: if (a[RTA_ENCAP] && a[RTA_ENCAP_TYPE])
! 721: {
! 722: if (rta_get_u16(a[RTA_ENCAP_TYPE]) != LWTUNNEL_ENCAP_MPLS) {
! 723: log(L_WARN "KRT: Unknown encapsulation method %d in multipath", rta_get_u16(a[RTA_ENCAP_TYPE]));
! 724: return NULL;
! 725: }
! 726:
! 727: struct rtattr *enca[BIRD_RTA_MAX];
! 728: nl_attr_len = RTA_PAYLOAD(a[RTA_ENCAP]);
! 729: nl_parse_attrs(RTA_DATA(a[RTA_ENCAP]), encap_mpls_want, enca, sizeof(enca));
! 730: rv->labels = rta_get_mpls(enca[RTA_DST], rv->label);
! 731: }
! 732: #endif
! 733:
! 734:
! 735: len -= NLMSG_ALIGN(nh->rtnh_len);
! 736: nh = RTNH_NEXT(nh);
! 737: }
! 738:
! 739: /* Ensure nexthops are sorted to satisfy nest invariant */
! 740: if (!nexthop_is_sorted(first))
! 741: first = nexthop_sort(first);
! 742:
! 743: return first;
! 744: }
! 745:
! 746: static void
! 747: nl_add_metrics(struct nlmsghdr *h, uint bufsize, u32 *metrics, int max)
! 748: {
! 749: struct rtattr *a = nl_open_attr(h, bufsize, RTA_METRICS);
! 750: int t;
! 751:
! 752: for (t = 1; t < max; t++)
! 753: if (metrics[0] & (1 << t))
! 754: nl_add_attr_u32(h, bufsize, t, metrics[t]);
! 755:
! 756: nl_close_attr(h, a);
! 757: }
! 758:
! 759: static int
! 760: nl_parse_metrics(struct rtattr *hdr, u32 *metrics, int max)
! 761: {
! 762: struct rtattr *a = RTA_DATA(hdr);
! 763: int len = RTA_PAYLOAD(hdr);
! 764:
! 765: metrics[0] = 0;
! 766: for (; RTA_OK(a, len); a = RTA_NEXT(a, len))
! 767: {
! 768: if (a->rta_type == RTA_UNSPEC)
! 769: continue;
! 770:
! 771: if (a->rta_type >= max)
! 772: continue;
! 773:
! 774: if (RTA_PAYLOAD(a) != 4)
! 775: return -1;
! 776:
! 777: metrics[0] |= 1 << a->rta_type;
! 778: metrics[a->rta_type] = rta_get_u32(a);
! 779: }
! 780:
! 781: if (len > 0)
! 782: return -1;
! 783:
! 784: return 0;
! 785: }
! 786:
! 787:
! 788: /*
! 789: * Scanning of interfaces
! 790: */
! 791:
! 792: static void
! 793: nl_parse_link(struct nlmsghdr *h, int scan)
! 794: {
! 795: struct ifinfomsg *i;
! 796: struct rtattr *a[BIRD_IFLA_MAX];
! 797: int new = h->nlmsg_type == RTM_NEWLINK;
! 798: struct iface f = {};
! 799: struct iface *ifi;
! 800: char *name;
! 801: u32 mtu, master = 0;
! 802: uint fl;
! 803:
! 804: if (!(i = nl_checkin(h, sizeof(*i))) || !nl_parse_attrs(IFLA_RTA(i), ifla_attr_want, a, sizeof(a)))
! 805: return;
! 806: if (!a[IFLA_IFNAME] || (RTA_PAYLOAD(a[IFLA_IFNAME]) < 2) || !a[IFLA_MTU])
! 807: {
! 808: /*
! 809: * IFLA_IFNAME and IFLA_MTU are required, in fact, but there may also come
! 810: * a message with IFLA_WIRELESS set, where (e.g.) no IFLA_IFNAME exists.
! 811: * We simply ignore all such messages with IFLA_WIRELESS without notice.
! 812: */
! 813:
! 814: if (a[IFLA_WIRELESS])
! 815: return;
! 816:
! 817: log(L_ERR "KIF: Malformed message received");
! 818: return;
! 819: }
! 820:
! 821: name = RTA_DATA(a[IFLA_IFNAME]);
! 822: mtu = rta_get_u32(a[IFLA_MTU]);
! 823:
! 824: if (a[IFLA_MASTER])
! 825: master = rta_get_u32(a[IFLA_MASTER]);
! 826:
! 827: ifi = if_find_by_index(i->ifi_index);
! 828: if (!new)
! 829: {
! 830: DBG("KIF: IF%d(%s) goes down\n", i->ifi_index, name);
! 831: if (!ifi)
! 832: return;
! 833:
! 834: if_delete(ifi);
! 835: }
! 836: else
! 837: {
! 838: DBG("KIF: IF%d(%s) goes up (mtu=%d,flg=%x)\n", i->ifi_index, name, mtu, i->ifi_flags);
! 839: if (ifi && strncmp(ifi->name, name, sizeof(ifi->name)-1))
! 840: if_delete(ifi);
! 841:
! 842: strncpy(f.name, name, sizeof(f.name)-1);
! 843: f.index = i->ifi_index;
! 844: f.mtu = mtu;
! 845:
! 846: f.master_index = master;
! 847: f.master = if_find_by_index(master);
! 848:
! 849: fl = i->ifi_flags;
! 850: if (fl & IFF_UP)
! 851: f.flags |= IF_ADMIN_UP;
! 852: if (fl & IFF_LOWER_UP)
! 853: f.flags |= IF_LINK_UP;
! 854: if (fl & IFF_LOOPBACK) /* Loopback */
! 855: f.flags |= IF_MULTIACCESS | IF_LOOPBACK | IF_IGNORE;
! 856: else if (fl & IFF_POINTOPOINT) /* PtP */
! 857: f.flags |= IF_MULTICAST;
! 858: else if (fl & IFF_BROADCAST) /* Broadcast */
! 859: f.flags |= IF_MULTIACCESS | IF_BROADCAST | IF_MULTICAST;
! 860: else
! 861: f.flags |= IF_MULTIACCESS; /* NBMA */
! 862:
! 863: if (fl & IFF_MULTICAST)
! 864: f.flags |= IF_MULTICAST;
! 865:
! 866: ifi = if_update(&f);
! 867:
! 868: if (!scan)
! 869: if_end_partial_update(ifi);
! 870: }
! 871: }
! 872:
! 873: static void
! 874: nl_parse_addr4(struct ifaddrmsg *i, int scan, int new)
! 875: {
! 876: struct rtattr *a[BIRD_IFA_MAX];
! 877: struct iface *ifi;
! 878: u32 ifa_flags;
! 879: int scope;
! 880:
! 881: if (!nl_parse_attrs(IFA_RTA(i), ifa_attr_want4, a, sizeof(a)))
! 882: return;
! 883:
! 884: if (!a[IFA_LOCAL])
! 885: {
! 886: log(L_ERR "KIF: Malformed message received (missing IFA_LOCAL)");
! 887: return;
! 888: }
! 889: if (!a[IFA_ADDRESS])
! 890: {
! 891: log(L_ERR "KIF: Malformed message received (missing IFA_ADDRESS)");
! 892: return;
! 893: }
! 894:
! 895: ifi = if_find_by_index(i->ifa_index);
! 896: if (!ifi)
! 897: {
! 898: log(L_ERR "KIF: Received address message for unknown interface %d", i->ifa_index);
! 899: return;
! 900: }
! 901:
! 902: if (a[IFA_FLAGS])
! 903: ifa_flags = rta_get_u32(a[IFA_FLAGS]);
! 904: else
! 905: ifa_flags = i->ifa_flags;
! 906:
! 907: struct ifa ifa;
! 908: bzero(&ifa, sizeof(ifa));
! 909: ifa.iface = ifi;
! 910: if (ifa_flags & IFA_F_SECONDARY)
! 911: ifa.flags |= IA_SECONDARY;
! 912:
! 913: ifa.ip = rta_get_ipa(a[IFA_LOCAL]);
! 914:
! 915: if (i->ifa_prefixlen > IP4_MAX_PREFIX_LENGTH)
! 916: {
! 917: log(L_ERR "KIF: Invalid prefix length for interface %s: %d", ifi->name, i->ifa_prefixlen);
! 918: new = 0;
! 919: }
! 920: if (i->ifa_prefixlen == IP4_MAX_PREFIX_LENGTH)
! 921: {
! 922: ifa.brd = rta_get_ipa(a[IFA_ADDRESS]);
! 923: net_fill_ip4(&ifa.prefix, rta_get_ip4(a[IFA_ADDRESS]), i->ifa_prefixlen);
! 924:
! 925: /* It is either a host address or a peer address */
! 926: if (ipa_equal(ifa.ip, ifa.brd))
! 927: ifa.flags |= IA_HOST;
! 928: else
! 929: {
! 930: ifa.flags |= IA_PEER;
! 931: ifa.opposite = ifa.brd;
! 932: }
! 933: }
! 934: else
! 935: {
! 936: net_fill_ip4(&ifa.prefix, ipa_to_ip4(ifa.ip), i->ifa_prefixlen);
! 937: net_normalize(&ifa.prefix);
! 938:
! 939: if (i->ifa_prefixlen == IP4_MAX_PREFIX_LENGTH - 1)
! 940: ifa.opposite = ipa_opposite_m1(ifa.ip);
! 941:
! 942: if (i->ifa_prefixlen == IP4_MAX_PREFIX_LENGTH - 2)
! 943: ifa.opposite = ipa_opposite_m2(ifa.ip);
! 944:
! 945: if ((ifi->flags & IF_BROADCAST) && a[IFA_BROADCAST])
! 946: {
! 947: ip4_addr xbrd = rta_get_ip4(a[IFA_BROADCAST]);
! 948: ip4_addr ybrd = ip4_or(ipa_to_ip4(ifa.ip), ip4_not(ip4_mkmask(i->ifa_prefixlen)));
! 949:
! 950: if (ip4_equal(xbrd, net4_prefix(&ifa.prefix)) || ip4_equal(xbrd, ybrd))
! 951: ifa.brd = ipa_from_ip4(xbrd);
! 952: else if (ifi->flags & IF_TMP_DOWN) /* Complain only during the first scan */
! 953: {
! 954: log(L_ERR "KIF: Invalid broadcast address %I4 for %s", xbrd, ifi->name);
! 955: ifa.brd = ipa_from_ip4(ybrd);
! 956: }
! 957: }
! 958: }
! 959:
! 960: scope = ipa_classify(ifa.ip);
! 961: if (scope < 0)
! 962: {
! 963: log(L_ERR "KIF: Invalid interface address %I for %s", ifa.ip, ifi->name);
! 964: return;
! 965: }
! 966: ifa.scope = scope & IADDR_SCOPE_MASK;
! 967:
! 968: DBG("KIF: IF%d(%s): %s IPA %I, flg %x, net %N, brd %I, opp %I\n",
! 969: ifi->index, ifi->name,
! 970: new ? "added" : "removed",
! 971: ifa.ip, ifa.flags, &ifa.prefix, ifa.brd, ifa.opposite);
! 972:
! 973: if (new)
! 974: ifa_update(&ifa);
! 975: else
! 976: ifa_delete(&ifa);
! 977:
! 978: if (!scan)
! 979: if_end_partial_update(ifi);
! 980: }
! 981:
! 982: static void
! 983: nl_parse_addr6(struct ifaddrmsg *i, int scan, int new)
! 984: {
! 985: struct rtattr *a[BIRD_IFA_MAX];
! 986: struct iface *ifi;
! 987: u32 ifa_flags;
! 988: int scope;
! 989:
! 990: if (!nl_parse_attrs(IFA_RTA(i), ifa_attr_want6, a, sizeof(a)))
! 991: return;
! 992:
! 993: if (!a[IFA_ADDRESS])
! 994: {
! 995: log(L_ERR "KIF: Malformed message received (missing IFA_ADDRESS)");
! 996: return;
! 997: }
! 998:
! 999: ifi = if_find_by_index(i->ifa_index);
! 1000: if (!ifi)
! 1001: {
! 1002: log(L_ERR "KIF: Received address message for unknown interface %d", i->ifa_index);
! 1003: return;
! 1004: }
! 1005:
! 1006: if (a[IFA_FLAGS])
! 1007: ifa_flags = rta_get_u32(a[IFA_FLAGS]);
! 1008: else
! 1009: ifa_flags = i->ifa_flags;
! 1010:
! 1011: struct ifa ifa;
! 1012: bzero(&ifa, sizeof(ifa));
! 1013: ifa.iface = ifi;
! 1014: if (ifa_flags & IFA_F_SECONDARY)
! 1015: ifa.flags |= IA_SECONDARY;
! 1016:
! 1017: /* Ignore tentative addresses silently */
! 1018: if (ifa_flags & IFA_F_TENTATIVE)
! 1019: return;
! 1020:
! 1021: /* IFA_LOCAL can be unset for IPv6 interfaces */
! 1022: ifa.ip = rta_get_ipa(a[IFA_LOCAL] ? : a[IFA_ADDRESS]);
! 1023:
! 1024: if (i->ifa_prefixlen > IP6_MAX_PREFIX_LENGTH)
! 1025: {
! 1026: log(L_ERR "KIF: Invalid prefix length for interface %s: %d", ifi->name, i->ifa_prefixlen);
! 1027: new = 0;
! 1028: }
! 1029: if (i->ifa_prefixlen == IP6_MAX_PREFIX_LENGTH)
! 1030: {
! 1031: ifa.brd = rta_get_ipa(a[IFA_ADDRESS]);
! 1032: net_fill_ip6(&ifa.prefix, rta_get_ip6(a[IFA_ADDRESS]), i->ifa_prefixlen);
! 1033:
! 1034: /* It is either a host address or a peer address */
! 1035: if (ipa_equal(ifa.ip, ifa.brd))
! 1036: ifa.flags |= IA_HOST;
! 1037: else
! 1038: {
! 1039: ifa.flags |= IA_PEER;
! 1040: ifa.opposite = ifa.brd;
! 1041: }
! 1042: }
! 1043: else
! 1044: {
! 1045: net_fill_ip6(&ifa.prefix, ipa_to_ip6(ifa.ip), i->ifa_prefixlen);
! 1046: net_normalize(&ifa.prefix);
! 1047:
! 1048: if (i->ifa_prefixlen == IP6_MAX_PREFIX_LENGTH - 1)
! 1049: ifa.opposite = ipa_opposite_m1(ifa.ip);
! 1050: }
! 1051:
! 1052: scope = ipa_classify(ifa.ip);
! 1053: if (scope < 0)
! 1054: {
! 1055: log(L_ERR "KIF: Invalid interface address %I for %s", ifa.ip, ifi->name);
! 1056: return;
! 1057: }
! 1058: ifa.scope = scope & IADDR_SCOPE_MASK;
! 1059:
! 1060: DBG("KIF: IF%d(%s): %s IPA %I, flg %x, net %N, brd %I, opp %I\n",
! 1061: ifi->index, ifi->name,
! 1062: new ? "added" : "removed",
! 1063: ifa.ip, ifa.flags, &ifa.prefix, ifa.brd, ifa.opposite);
! 1064:
! 1065: if (new)
! 1066: ifa_update(&ifa);
! 1067: else
! 1068: ifa_delete(&ifa);
! 1069:
! 1070: if (!scan)
! 1071: if_end_partial_update(ifi);
! 1072: }
! 1073:
! 1074: static void
! 1075: nl_parse_addr(struct nlmsghdr *h, int scan)
! 1076: {
! 1077: struct ifaddrmsg *i;
! 1078:
! 1079: if (!(i = nl_checkin(h, sizeof(*i))))
! 1080: return;
! 1081:
! 1082: int new = (h->nlmsg_type == RTM_NEWADDR);
! 1083:
! 1084: switch (i->ifa_family)
! 1085: {
! 1086: case AF_INET:
! 1087: return nl_parse_addr4(i, scan, new);
! 1088:
! 1089: case AF_INET6:
! 1090: return nl_parse_addr6(i, scan, new);
! 1091: }
! 1092: }
! 1093:
! 1094: void
! 1095: kif_do_scan(struct kif_proto *p UNUSED)
! 1096: {
! 1097: struct nlmsghdr *h;
! 1098:
! 1099: if_start_update();
! 1100:
! 1101: nl_request_dump(AF_UNSPEC, RTM_GETLINK);
! 1102: while (h = nl_get_scan())
! 1103: if (h->nlmsg_type == RTM_NEWLINK || h->nlmsg_type == RTM_DELLINK)
! 1104: nl_parse_link(h, 1);
! 1105: else
! 1106: log(L_DEBUG "nl_scan_ifaces: Unknown packet received (type=%d)", h->nlmsg_type);
! 1107:
! 1108: /* Re-resolve master interface for slaves */
! 1109: struct iface *i;
! 1110: WALK_LIST(i, iface_list)
! 1111: if (i->master_index)
! 1112: {
! 1113: struct iface f = {
! 1114: .flags = i->flags,
! 1115: .mtu = i->mtu,
! 1116: .index = i->index,
! 1117: .master_index = i->master_index,
! 1118: .master = if_find_by_index(i->master_index)
! 1119: };
! 1120:
! 1121: if (f.master != i->master)
! 1122: {
! 1123: memcpy(f.name, i->name, sizeof(f.name));
! 1124: if_update(&f);
! 1125: }
! 1126: }
! 1127:
! 1128: nl_request_dump(AF_INET, RTM_GETADDR);
! 1129: while (h = nl_get_scan())
! 1130: if (h->nlmsg_type == RTM_NEWADDR || h->nlmsg_type == RTM_DELADDR)
! 1131: nl_parse_addr(h, 1);
! 1132: else
! 1133: log(L_DEBUG "nl_scan_ifaces: Unknown packet received (type=%d)", h->nlmsg_type);
! 1134:
! 1135: nl_request_dump(AF_INET6, RTM_GETADDR);
! 1136: while (h = nl_get_scan())
! 1137: if (h->nlmsg_type == RTM_NEWADDR || h->nlmsg_type == RTM_DELADDR)
! 1138: nl_parse_addr(h, 1);
! 1139: else
! 1140: log(L_DEBUG "nl_scan_ifaces: Unknown packet received (type=%d)", h->nlmsg_type);
! 1141:
! 1142: if_end_update();
! 1143: }
! 1144:
! 1145: /*
! 1146: * Routes
! 1147: */
! 1148:
! 1149: static inline u32
! 1150: krt_table_id(struct krt_proto *p)
! 1151: {
! 1152: return KRT_CF->sys.table_id;
! 1153: }
! 1154:
! 1155: static HASH(struct krt_proto) nl_table_map;
! 1156:
! 1157: #define RTH_KEY(p) p->af, krt_table_id(p)
! 1158: #define RTH_NEXT(p) p->sys.hash_next
! 1159: #define RTH_EQ(a1,i1,a2,i2) a1 == a2 && i1 == i2
! 1160: #define RTH_FN(a,i) a ^ u32_hash(i)
! 1161:
! 1162: #define RTH_REHASH rth_rehash
! 1163: #define RTH_PARAMS /8, *2, 2, 2, 6, 20
! 1164:
! 1165: HASH_DEFINE_REHASH_FN(RTH, struct krt_proto)
! 1166:
! 1167: int
! 1168: krt_capable(rte *e)
! 1169: {
! 1170: rta *a = e->attrs;
! 1171:
! 1172: switch (a->dest)
! 1173: {
! 1174: case RTD_UNICAST:
! 1175: case RTD_BLACKHOLE:
! 1176: case RTD_UNREACHABLE:
! 1177: case RTD_PROHIBIT:
! 1178: return 1;
! 1179:
! 1180: default:
! 1181: return 0;
! 1182: }
! 1183: }
! 1184:
! 1185: static inline int
! 1186: nh_bufsize(struct nexthop *nh)
! 1187: {
! 1188: int rv = 0;
! 1189: for (; nh != NULL; nh = nh->next)
! 1190: rv += RTNH_LENGTH(RTA_LENGTH(sizeof(ip_addr)));
! 1191: return rv;
! 1192: }
! 1193:
! 1194: static int
! 1195: nl_send_route(struct krt_proto *p, rte *e, int op, int dest, struct nexthop *nh)
! 1196: {
! 1197: eattr *ea;
! 1198: net *net = e->net;
! 1199: rta *a = e->attrs;
! 1200: ea_list *eattrs = a->eattrs;
! 1201: int bufsize = 128 + KRT_METRICS_MAX*8 + nh_bufsize(&(a->nh));
! 1202: u32 priority = 0;
! 1203:
! 1204: struct {
! 1205: struct nlmsghdr h;
! 1206: struct rtmsg r;
! 1207: char buf[0];
! 1208: } *r;
! 1209:
! 1210: int rsize = sizeof(*r) + bufsize;
! 1211: r = alloca(rsize);
! 1212:
! 1213: DBG("nl_send_route(%N,op=%x)\n", net->n.addr, op);
! 1214:
! 1215: bzero(&r->h, sizeof(r->h));
! 1216: bzero(&r->r, sizeof(r->r));
! 1217: r->h.nlmsg_type = op ? RTM_NEWROUTE : RTM_DELROUTE;
! 1218: r->h.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
! 1219: r->h.nlmsg_flags = op | NLM_F_REQUEST | NLM_F_ACK;
! 1220:
! 1221: r->r.rtm_family = p->af;
! 1222: r->r.rtm_dst_len = net_pxlen(net->n.addr);
! 1223: r->r.rtm_protocol = RTPROT_BIRD;
! 1224: r->r.rtm_scope = RT_SCOPE_NOWHERE;
! 1225: #ifdef HAVE_MPLS_KERNEL
! 1226: if (p->af == AF_MPLS)
! 1227: {
! 1228: /*
! 1229: * Kernel MPLS code is a bit picky. We must:
! 1230: * 1) Always set RT_SCOPE_UNIVERSE and RTN_UNICAST (even for RTM_DELROUTE)
! 1231: * 2) Never use RTA_PRIORITY
! 1232: */
! 1233:
! 1234: u32 label = net_mpls(net->n.addr);
! 1235: nl_add_attr_mpls(&r->h, rsize, RTA_DST, 1, &label);
! 1236: r->r.rtm_scope = RT_SCOPE_UNIVERSE;
! 1237: r->r.rtm_type = RTN_UNICAST;
! 1238: }
! 1239: else
! 1240: #endif
! 1241: {
! 1242: nl_add_attr_ipa(&r->h, rsize, RTA_DST, net_prefix(net->n.addr));
! 1243:
! 1244: /* Add source address for IPv6 SADR routes */
! 1245: if (net->n.addr->type == NET_IP6_SADR)
! 1246: {
! 1247: net_addr_ip6_sadr *a = (void *) &net->n.addr;
! 1248: nl_add_attr_ip6(&r->h, rsize, RTA_SRC, a->src_prefix);
! 1249: r->r.rtm_src_len = a->src_pxlen;
! 1250: }
! 1251: }
! 1252:
! 1253: /*
! 1254: * Strange behavior for RTM_DELROUTE:
! 1255: * 1) rtm_family is ignored in IPv6, works for IPv4
! 1256: * 2) not setting RTA_PRIORITY is different from setting default value (on IPv6)
! 1257: * 3) not setting RTA_PRIORITY is equivalent to setting 0, which is wildcard
! 1258: */
! 1259:
! 1260: if (krt_table_id(p) < 256)
! 1261: r->r.rtm_table = krt_table_id(p);
! 1262: else
! 1263: nl_add_attr_u32(&r->h, rsize, RTA_TABLE, krt_table_id(p));
! 1264:
! 1265: if (p->af == AF_MPLS)
! 1266: priority = 0;
! 1267: else if (a->source == RTS_DUMMY)
! 1268: priority = e->u.krt.metric;
! 1269: else if (KRT_CF->sys.metric)
! 1270: priority = KRT_CF->sys.metric;
! 1271: else if ((op != NL_OP_DELETE) && (ea = ea_find(eattrs, EA_KRT_METRIC)))
! 1272: priority = ea->u.data;
! 1273:
! 1274: if (priority)
! 1275: nl_add_attr_u32(&r->h, rsize, RTA_PRIORITY, priority);
! 1276:
! 1277: /* For route delete, we do not specify remaining route attributes */
! 1278: if (op == NL_OP_DELETE)
! 1279: goto dest;
! 1280:
! 1281: /* Default scope is LINK for device routes, UNIVERSE otherwise */
! 1282: if (p->af == AF_MPLS)
! 1283: r->r.rtm_scope = RT_SCOPE_UNIVERSE;
! 1284: else if (ea = ea_find(eattrs, EA_KRT_SCOPE))
! 1285: r->r.rtm_scope = ea->u.data;
! 1286: else
! 1287: r->r.rtm_scope = (dest == RTD_UNICAST && ipa_zero(nh->gw)) ? RT_SCOPE_LINK : RT_SCOPE_UNIVERSE;
! 1288:
! 1289: if (ea = ea_find(eattrs, EA_KRT_PREFSRC))
! 1290: nl_add_attr_ipa(&r->h, rsize, RTA_PREFSRC, *(ip_addr *)ea->u.ptr->data);
! 1291:
! 1292: if (ea = ea_find(eattrs, EA_KRT_REALM))
! 1293: nl_add_attr_u32(&r->h, rsize, RTA_FLOW, ea->u.data);
! 1294:
! 1295:
! 1296: u32 metrics[KRT_METRICS_MAX];
! 1297: metrics[0] = 0;
! 1298:
! 1299: struct ea_walk_state ews = { .eattrs = eattrs };
! 1300: while (ea = ea_walk(&ews, EA_KRT_METRICS, KRT_METRICS_MAX))
! 1301: {
! 1302: int id = ea->id - EA_KRT_METRICS;
! 1303: metrics[0] |= 1 << id;
! 1304: metrics[id] = ea->u.data;
! 1305: }
! 1306:
! 1307: if (metrics[0])
! 1308: nl_add_metrics(&r->h, rsize, metrics, KRT_METRICS_MAX);
! 1309:
! 1310:
! 1311: dest:
! 1312: switch (dest)
! 1313: {
! 1314: case RTD_UNICAST:
! 1315: r->r.rtm_type = RTN_UNICAST;
! 1316: if (nh->next && !krt_ecmp6(p))
! 1317: nl_add_multipath(&r->h, rsize, nh, p->af);
! 1318: else
! 1319: {
! 1320: nl_add_attr_u32(&r->h, rsize, RTA_OIF, nh->iface->index);
! 1321: nl_add_nexthop(&r->h, rsize, nh, p->af);
! 1322:
! 1323: if (nh->flags & RNF_ONLINK)
! 1324: r->r.rtm_flags |= RTNH_F_ONLINK;
! 1325: }
! 1326: break;
! 1327: case RTD_BLACKHOLE:
! 1328: r->r.rtm_type = RTN_BLACKHOLE;
! 1329: break;
! 1330: case RTD_UNREACHABLE:
! 1331: r->r.rtm_type = RTN_UNREACHABLE;
! 1332: break;
! 1333: case RTD_PROHIBIT:
! 1334: r->r.rtm_type = RTN_PROHIBIT;
! 1335: break;
! 1336: case RTD_NONE:
! 1337: break;
! 1338: default:
! 1339: bug("krt_capable inconsistent with nl_send_route");
! 1340: }
! 1341:
! 1342: /* Ignore missing for DELETE */
! 1343: return nl_exchange(&r->h, (op == NL_OP_DELETE));
! 1344: }
! 1345:
! 1346: static inline int
! 1347: nl_add_rte(struct krt_proto *p, rte *e)
! 1348: {
! 1349: rta *a = e->attrs;
! 1350: int err = 0;
! 1351:
! 1352: if (krt_ecmp6(p) && a->nh.next)
! 1353: {
! 1354: struct nexthop *nh = &(a->nh);
! 1355:
! 1356: err = nl_send_route(p, e, NL_OP_ADD, RTD_UNICAST, nh);
! 1357: if (err < 0)
! 1358: return err;
! 1359:
! 1360: for (nh = nh->next; nh; nh = nh->next)
! 1361: err += nl_send_route(p, e, NL_OP_APPEND, RTD_UNICAST, nh);
! 1362:
! 1363: return err;
! 1364: }
! 1365:
! 1366: return nl_send_route(p, e, NL_OP_ADD, a->dest, &(a->nh));
! 1367: }
! 1368:
! 1369: static inline int
! 1370: nl_delete_rte(struct krt_proto *p, rte *e)
! 1371: {
! 1372: int err = 0;
! 1373:
! 1374: /* For IPv6, we just repeatedly request DELETE until we get error */
! 1375: do
! 1376: err = nl_send_route(p, e, NL_OP_DELETE, RTD_NONE, NULL);
! 1377: while (krt_ecmp6(p) && !err);
! 1378:
! 1379: return err;
! 1380: }
! 1381:
! 1382: static inline int
! 1383: nl_replace_rte(struct krt_proto *p, rte *e)
! 1384: {
! 1385: rta *a = e->attrs;
! 1386: return nl_send_route(p, e, NL_OP_REPLACE, a->dest, &(a->nh));
! 1387: }
! 1388:
! 1389:
! 1390: void
! 1391: krt_replace_rte(struct krt_proto *p, net *n, rte *new, rte *old)
! 1392: {
! 1393: int err = 0;
! 1394:
! 1395: /*
! 1396: * We use NL_OP_REPLACE for IPv4, it has an issue with not checking for
! 1397: * matching rtm_protocol, but that is OK when dedicated priority is used.
! 1398: *
! 1399: * We do not use NL_OP_REPLACE for IPv6, as it has broken semantics for ECMP
! 1400: * and with some kernel versions ECMP replace crashes kernel. Would need more
! 1401: * testing and checks for kernel versions.
! 1402: *
! 1403: * For IPv6, we use NL_OP_DELETE and then NL_OP_ADD. We also do not trust the
! 1404: * old route value, so we do not try to optimize IPv6 ECMP reconfigurations.
! 1405: */
! 1406:
! 1407: if (krt_ipv4(p) && old && new)
! 1408: {
! 1409: err = nl_replace_rte(p, new);
! 1410: }
! 1411: else
! 1412: {
! 1413: if (old)
! 1414: nl_delete_rte(p, old);
! 1415:
! 1416: if (new)
! 1417: err = nl_add_rte(p, new);
! 1418: }
! 1419:
! 1420: if (err < 0)
! 1421: n->n.flags |= KRF_SYNC_ERROR;
! 1422: else
! 1423: n->n.flags &= ~KRF_SYNC_ERROR;
! 1424: }
! 1425:
! 1426: static int
! 1427: nl_mergable_route(struct nl_parse_state *s, net *net, struct krt_proto *p, uint priority, uint krt_type, uint rtm_family)
! 1428: {
! 1429: /* Route merging is used for IPv6 scans */
! 1430: if (!s->scan || (rtm_family != AF_INET6))
! 1431: return 0;
! 1432:
! 1433: /* Saved and new route must have same network, proto/table, and priority */
! 1434: if ((s->net != net) || (s->proto != p) || (s->krt_metric != priority))
! 1435: return 0;
! 1436:
! 1437: /* Both must be regular unicast routes */
! 1438: if ((s->krt_type != RTN_UNICAST) || (krt_type != RTN_UNICAST))
! 1439: return 0;
! 1440:
! 1441: return 1;
! 1442: }
! 1443:
! 1444: static void
! 1445: nl_announce_route(struct nl_parse_state *s)
! 1446: {
! 1447: rte *e = rte_get_temp(s->attrs);
! 1448: e->net = s->net;
! 1449: e->u.krt.src = s->krt_src;
! 1450: e->u.krt.proto = s->krt_proto;
! 1451: e->u.krt.seen = 0;
! 1452: e->u.krt.best = 0;
! 1453: e->u.krt.metric = s->krt_metric;
! 1454:
! 1455: if (s->scan)
! 1456: krt_got_route(s->proto, e);
! 1457: else
! 1458: krt_got_route_async(s->proto, e, s->new);
! 1459:
! 1460: s->net = NULL;
! 1461: s->attrs = NULL;
! 1462: s->proto = NULL;
! 1463: lp_flush(s->pool);
! 1464: }
! 1465:
! 1466: static inline void
! 1467: nl_parse_begin(struct nl_parse_state *s, int scan)
! 1468: {
! 1469: memset(s, 0, sizeof (struct nl_parse_state));
! 1470: s->pool = nl_linpool;
! 1471: s->scan = scan;
! 1472: }
! 1473:
! 1474: static inline void
! 1475: nl_parse_end(struct nl_parse_state *s)
! 1476: {
! 1477: if (s->net)
! 1478: nl_announce_route(s);
! 1479: }
! 1480:
! 1481:
! 1482: #define SKIP(ARG...) do { DBG("KRT: Ignoring route - " ARG); return; } while(0)
! 1483:
! 1484: static void
! 1485: nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
! 1486: {
! 1487: struct krt_proto *p;
! 1488: struct rtmsg *i;
! 1489: struct rtattr *a[BIRD_RTA_MAX];
! 1490: int new = h->nlmsg_type == RTM_NEWROUTE;
! 1491:
! 1492: net_addr dst, src = {};
! 1493: u32 oif = ~0;
! 1494: u32 table_id;
! 1495: u32 priority = 0;
! 1496: u32 def_scope = RT_SCOPE_UNIVERSE;
! 1497: int krt_src;
! 1498:
! 1499: if (!(i = nl_checkin(h, sizeof(*i))))
! 1500: return;
! 1501:
! 1502: switch (i->rtm_family)
! 1503: {
! 1504: case AF_INET:
! 1505: if (!nl_parse_attrs(RTM_RTA(i), rtm_attr_want4, a, sizeof(a)))
! 1506: return;
! 1507:
! 1508: if (a[RTA_DST])
! 1509: net_fill_ip4(&dst, rta_get_ip4(a[RTA_DST]), i->rtm_dst_len);
! 1510: else
! 1511: net_fill_ip4(&dst, IP4_NONE, 0);
! 1512: break;
! 1513:
! 1514: case AF_INET6:
! 1515: if (!nl_parse_attrs(RTM_RTA(i), rtm_attr_want6, a, sizeof(a)))
! 1516: return;
! 1517:
! 1518: if (a[RTA_DST])
! 1519: net_fill_ip6(&dst, rta_get_ip6(a[RTA_DST]), i->rtm_dst_len);
! 1520: else
! 1521: net_fill_ip6(&dst, IP6_NONE, 0);
! 1522:
! 1523: if (a[RTA_SRC])
! 1524: net_fill_ip6(&src, rta_get_ip6(a[RTA_SRC]), i->rtm_src_len);
! 1525: else
! 1526: net_fill_ip6(&src, IP6_NONE, 0);
! 1527: break;
! 1528:
! 1529: #ifdef HAVE_MPLS_KERNEL
! 1530: case AF_MPLS:
! 1531: if (!nl_parse_attrs(RTM_RTA(i), rtm_attr_want_mpls, a, sizeof(a)))
! 1532: return;
! 1533:
! 1534: if (!a[RTA_DST])
! 1535: SKIP("MPLS route without RTA_DST");
! 1536:
! 1537: if (rta_get_mpls(a[RTA_DST], rta_mpls_stack) != 1)
! 1538: SKIP("MPLS route with multi-label RTA_DST");
! 1539:
! 1540: net_fill_mpls(&dst, rta_mpls_stack[0]);
! 1541: break;
! 1542: #endif
! 1543:
! 1544: default:
! 1545: return;
! 1546: }
! 1547:
! 1548: if (a[RTA_OIF])
! 1549: oif = rta_get_u32(a[RTA_OIF]);
! 1550:
! 1551: if (a[RTA_TABLE])
! 1552: table_id = rta_get_u32(a[RTA_TABLE]);
! 1553: else
! 1554: table_id = i->rtm_table;
! 1555:
! 1556: /* Do we know this table? */
! 1557: p = HASH_FIND(nl_table_map, RTH, i->rtm_family, table_id);
! 1558: if (!p)
! 1559: SKIP("unknown table %u\n", table_id);
! 1560:
! 1561: if (a[RTA_SRC] && (p->p.net_type != NET_IP6_SADR))
! 1562: SKIP("src prefix for non-SADR channel\n");
! 1563:
! 1564: if (a[RTA_IIF])
! 1565: SKIP("IIF set\n");
! 1566:
! 1567: if (i->rtm_tos != 0) /* We don't support TOS */
! 1568: SKIP("TOS %02x\n", i->rtm_tos);
! 1569:
! 1570: if (s->scan && !new)
! 1571: SKIP("RTM_DELROUTE in scan\n");
! 1572:
! 1573: if (a[RTA_PRIORITY])
! 1574: priority = rta_get_u32(a[RTA_PRIORITY]);
! 1575:
! 1576: int c = net_classify(&dst);
! 1577: if ((c < 0) || !(c & IADDR_HOST) || ((c & IADDR_SCOPE_MASK) <= SCOPE_LINK))
! 1578: SKIP("strange class/scope\n");
! 1579:
! 1580: switch (i->rtm_protocol)
! 1581: {
! 1582: case RTPROT_UNSPEC:
! 1583: SKIP("proto unspec\n");
! 1584:
! 1585: case RTPROT_REDIRECT:
! 1586: krt_src = KRT_SRC_REDIRECT;
! 1587: break;
! 1588:
! 1589: case RTPROT_KERNEL:
! 1590: krt_src = KRT_SRC_KERNEL;
! 1591: return;
! 1592:
! 1593: case RTPROT_BIRD:
! 1594: if (!s->scan)
! 1595: SKIP("echo\n");
! 1596: krt_src = KRT_SRC_BIRD;
! 1597: break;
! 1598:
! 1599: case RTPROT_BOOT:
! 1600: default:
! 1601: krt_src = KRT_SRC_ALIEN;
! 1602: }
! 1603:
! 1604: net_addr *n = &dst;
! 1605: if (p->p.net_type == NET_IP6_SADR)
! 1606: {
! 1607: n = alloca(sizeof(net_addr_ip6_sadr));
! 1608: net_fill_ip6_sadr(n, net6_prefix(&dst), net6_pxlen(&dst),
! 1609: net6_prefix(&src), net6_pxlen(&src));
! 1610: }
! 1611:
! 1612: net *net = net_get(p->p.main_channel->table, n);
! 1613:
! 1614: if (s->net && !nl_mergable_route(s, net, p, priority, i->rtm_type, i->rtm_family))
! 1615: nl_announce_route(s);
! 1616:
! 1617: rta *ra = lp_allocz(s->pool, RTA_MAX_SIZE);
! 1618: ra->src = p->p.main_source;
! 1619: ra->source = RTS_INHERIT;
! 1620: ra->scope = SCOPE_UNIVERSE;
! 1621:
! 1622: switch (i->rtm_type)
! 1623: {
! 1624: case RTN_UNICAST:
! 1625: ra->dest = RTD_UNICAST;
! 1626:
! 1627: if (a[RTA_MULTIPATH])
! 1628: {
! 1629: struct nexthop *nh = nl_parse_multipath(s, p, a[RTA_MULTIPATH], i->rtm_family);
! 1630: if (!nh)
! 1631: {
! 1632: log(L_ERR "KRT: Received strange multipath route %N", net->n.addr);
! 1633: return;
! 1634: }
! 1635:
! 1636: nexthop_link(ra, nh);
! 1637: break;
! 1638: }
! 1639:
! 1640: ra->nh.iface = if_find_by_index(oif);
! 1641: if (!ra->nh.iface)
! 1642: {
! 1643: log(L_ERR "KRT: Received route %N with unknown ifindex %u", net->n.addr, oif);
! 1644: return;
! 1645: }
! 1646:
! 1647: if ((i->rtm_family != AF_MPLS) && a[RTA_GATEWAY]
! 1648: #ifdef HAVE_MPLS_KERNEL
! 1649: || (i->rtm_family == AF_MPLS) && a[RTA_VIA]
! 1650: #endif
! 1651: )
! 1652: {
! 1653: #ifdef HAVE_MPLS_KERNEL
! 1654: if (i->rtm_family == AF_MPLS)
! 1655: ra->nh.gw = rta_get_via(a[RTA_VIA]);
! 1656: else
! 1657: #endif
! 1658: ra->nh.gw = rta_get_ipa(a[RTA_GATEWAY]);
! 1659:
! 1660: /* Silently skip strange 6to4 routes */
! 1661: const net_addr_ip6 sit = NET_ADDR_IP6(IP6_NONE, 96);
! 1662: if ((i->rtm_family == AF_INET6) && ipa_in_netX(ra->nh.gw, (net_addr *) &sit))
! 1663: return;
! 1664:
! 1665: if (i->rtm_flags & RTNH_F_ONLINK)
! 1666: ra->nh.flags |= RNF_ONLINK;
! 1667:
! 1668: neighbor *nbr;
! 1669: nbr = neigh_find(&p->p, ra->nh.gw, ra->nh.iface,
! 1670: (ra->nh.flags & RNF_ONLINK) ? NEF_ONLINK : 0);
! 1671: if (!nbr || (nbr->scope == SCOPE_HOST))
! 1672: {
! 1673: log(L_ERR "KRT: Received route %N with strange next-hop %I", net->n.addr,
! 1674: ra->nh.gw);
! 1675: return;
! 1676: }
! 1677: }
! 1678:
! 1679: break;
! 1680: case RTN_BLACKHOLE:
! 1681: ra->dest = RTD_BLACKHOLE;
! 1682: break;
! 1683: case RTN_UNREACHABLE:
! 1684: ra->dest = RTD_UNREACHABLE;
! 1685: break;
! 1686: case RTN_PROHIBIT:
! 1687: ra->dest = RTD_PROHIBIT;
! 1688: break;
! 1689: /* FIXME: What about RTN_THROW? */
! 1690: default:
! 1691: SKIP("type %d\n", i->rtm_type);
! 1692: return;
! 1693: }
! 1694:
! 1695: #ifdef HAVE_MPLS_KERNEL
! 1696: if ((i->rtm_family == AF_MPLS) && a[RTA_NEWDST] && !ra->nh.next)
! 1697: ra->nh.labels = rta_get_mpls(a[RTA_NEWDST], ra->nh.label);
! 1698:
! 1699: if (a[RTA_ENCAP] && a[RTA_ENCAP_TYPE] && !ra->nh.next)
! 1700: {
! 1701: switch (rta_get_u16(a[RTA_ENCAP_TYPE]))
! 1702: {
! 1703: case LWTUNNEL_ENCAP_MPLS:
! 1704: {
! 1705: struct rtattr *enca[BIRD_RTA_MAX];
! 1706: nl_attr_len = RTA_PAYLOAD(a[RTA_ENCAP]);
! 1707: nl_parse_attrs(RTA_DATA(a[RTA_ENCAP]), encap_mpls_want, enca, sizeof(enca));
! 1708: ra->nh.labels = rta_get_mpls(enca[RTA_DST], ra->nh.label);
! 1709: break;
! 1710: }
! 1711: default:
! 1712: SKIP("unknown encapsulation method %d\n", rta_get_u16(a[RTA_ENCAP_TYPE]));
! 1713: break;
! 1714: }
! 1715: }
! 1716: #endif
! 1717:
! 1718: if (i->rtm_scope != def_scope)
! 1719: {
! 1720: ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + sizeof(eattr));
! 1721: ea->next = ra->eattrs;
! 1722: ra->eattrs = ea;
! 1723: ea->flags = EALF_SORTED;
! 1724: ea->count = 1;
! 1725: ea->attrs[0].id = EA_KRT_SCOPE;
! 1726: ea->attrs[0].flags = 0;
! 1727: ea->attrs[0].type = EAF_TYPE_INT;
! 1728: ea->attrs[0].u.data = i->rtm_scope;
! 1729: }
! 1730:
! 1731: if (a[RTA_PREFSRC])
! 1732: {
! 1733: ip_addr ps = rta_get_ipa(a[RTA_PREFSRC]);
! 1734:
! 1735: ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + sizeof(eattr));
! 1736: ea->next = ra->eattrs;
! 1737: ra->eattrs = ea;
! 1738: ea->flags = EALF_SORTED;
! 1739: ea->count = 1;
! 1740: ea->attrs[0].id = EA_KRT_PREFSRC;
! 1741: ea->attrs[0].flags = 0;
! 1742: ea->attrs[0].type = EAF_TYPE_IP_ADDRESS;
! 1743:
! 1744: struct adata *ad = lp_alloc(s->pool, sizeof(struct adata) + sizeof(ps));
! 1745: ad->length = sizeof(ps);
! 1746: memcpy(ad->data, &ps, sizeof(ps));
! 1747:
! 1748: ea->attrs[0].u.ptr = ad;
! 1749: }
! 1750:
! 1751: if (a[RTA_FLOW])
! 1752: {
! 1753: ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + sizeof(eattr));
! 1754: ea->next = ra->eattrs;
! 1755: ra->eattrs = ea;
! 1756: ea->flags = EALF_SORTED;
! 1757: ea->count = 1;
! 1758: ea->attrs[0].id = EA_KRT_REALM;
! 1759: ea->attrs[0].flags = 0;
! 1760: ea->attrs[0].type = EAF_TYPE_INT;
! 1761: ea->attrs[0].u.data = rta_get_u32(a[RTA_FLOW]);
! 1762: }
! 1763:
! 1764: if (a[RTA_METRICS])
! 1765: {
! 1766: u32 metrics[KRT_METRICS_MAX];
! 1767: ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + KRT_METRICS_MAX * sizeof(eattr));
! 1768: int t, n = 0;
! 1769:
! 1770: if (nl_parse_metrics(a[RTA_METRICS], metrics, ARRAY_SIZE(metrics)) < 0)
! 1771: {
! 1772: log(L_ERR "KRT: Received route %N with strange RTA_METRICS attribute", net->n.addr);
! 1773: return;
! 1774: }
! 1775:
! 1776: for (t = 1; t < KRT_METRICS_MAX; t++)
! 1777: if (metrics[0] & (1 << t))
! 1778: {
! 1779: ea->attrs[n].id = EA_CODE(PROTOCOL_KERNEL, KRT_METRICS_OFFSET + t);
! 1780: ea->attrs[n].flags = 0;
! 1781: ea->attrs[n].type = EAF_TYPE_INT; /* FIXME: Some are EAF_TYPE_BITFIELD */
! 1782: ea->attrs[n].u.data = metrics[t];
! 1783: n++;
! 1784: }
! 1785:
! 1786: if (n > 0)
! 1787: {
! 1788: ea->next = ra->eattrs;
! 1789: ea->flags = EALF_SORTED;
! 1790: ea->count = n;
! 1791: ra->eattrs = ea;
! 1792: }
! 1793: }
! 1794:
! 1795: /*
! 1796: * Ideally, now we would send the received route to the rest of kernel code.
! 1797: * But IPv6 ECMP routes before 4.11 are sent as a sequence of routes, so we
! 1798: * postpone it and merge next hops until the end of the sequence. Note that
! 1799: * when doing merging of next hops, we expect the new route to be unipath.
! 1800: * Otherwise, we ignore additional next hops in nexthop_insert().
! 1801: */
! 1802:
! 1803: if (!s->net)
! 1804: {
! 1805: /* Store the new route */
! 1806: s->net = net;
! 1807: s->attrs = ra;
! 1808: s->proto = p;
! 1809: s->new = new;
! 1810: s->krt_src = krt_src;
! 1811: s->krt_type = i->rtm_type;
! 1812: s->krt_proto = i->rtm_protocol;
! 1813: s->krt_metric = priority;
! 1814: }
! 1815: else
! 1816: {
! 1817: /* Merge next hops with the stored route */
! 1818: rta *oa = s->attrs;
! 1819:
! 1820: struct nexthop *nhs = &oa->nh;
! 1821: nexthop_insert(&nhs, &ra->nh);
! 1822:
! 1823: /* Perhaps new nexthop is inserted at the first position */
! 1824: if (nhs == &ra->nh)
! 1825: {
! 1826: /* Swap rtas */
! 1827: s->attrs = ra;
! 1828:
! 1829: /* Keep old eattrs */
! 1830: ra->eattrs = oa->eattrs;
! 1831: }
! 1832: }
! 1833: }
! 1834:
! 1835: void
! 1836: krt_do_scan(struct krt_proto *p UNUSED) /* CONFIG_ALL_TABLES_AT_ONCE => p is NULL */
! 1837: {
! 1838: struct nlmsghdr *h;
! 1839: struct nl_parse_state s;
! 1840:
! 1841: nl_parse_begin(&s, 1);
! 1842: nl_request_dump(AF_UNSPEC, RTM_GETROUTE);
! 1843: while (h = nl_get_scan())
! 1844: if (h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE)
! 1845: nl_parse_route(&s, h);
! 1846: else
! 1847: log(L_DEBUG "nl_scan_fire: Unknown packet received (type=%d)", h->nlmsg_type);
! 1848: nl_parse_end(&s);
! 1849: }
! 1850:
! 1851: /*
! 1852: * Asynchronous Netlink interface
! 1853: */
! 1854:
! 1855: static sock *nl_async_sk; /* BIRD socket for asynchronous notifications */
! 1856: static byte *nl_async_rx_buffer; /* Receive buffer */
! 1857:
! 1858: static void
! 1859: nl_async_msg(struct nlmsghdr *h)
! 1860: {
! 1861: struct nl_parse_state s;
! 1862:
! 1863: switch (h->nlmsg_type)
! 1864: {
! 1865: case RTM_NEWROUTE:
! 1866: case RTM_DELROUTE:
! 1867: DBG("KRT: Received async route notification (%d)\n", h->nlmsg_type);
! 1868: nl_parse_begin(&s, 0);
! 1869: nl_parse_route(&s, h);
! 1870: nl_parse_end(&s);
! 1871: break;
! 1872: case RTM_NEWLINK:
! 1873: case RTM_DELLINK:
! 1874: DBG("KRT: Received async link notification (%d)\n", h->nlmsg_type);
! 1875: if (kif_proto)
! 1876: nl_parse_link(h, 0);
! 1877: break;
! 1878: case RTM_NEWADDR:
! 1879: case RTM_DELADDR:
! 1880: DBG("KRT: Received async address notification (%d)\n", h->nlmsg_type);
! 1881: if (kif_proto)
! 1882: nl_parse_addr(h, 0);
! 1883: break;
! 1884: default:
! 1885: DBG("KRT: Received unknown async notification (%d)\n", h->nlmsg_type);
! 1886: }
! 1887: }
! 1888:
! 1889: static int
! 1890: nl_async_hook(sock *sk, uint size UNUSED)
! 1891: {
! 1892: struct iovec iov = { nl_async_rx_buffer, NL_RX_SIZE };
! 1893: struct sockaddr_nl sa;
! 1894: struct msghdr m = {
! 1895: .msg_name = &sa,
! 1896: .msg_namelen = sizeof(sa),
! 1897: .msg_iov = &iov,
! 1898: .msg_iovlen = 1,
! 1899: };
! 1900: struct nlmsghdr *h;
! 1901: int x;
! 1902: uint len;
! 1903:
! 1904: x = recvmsg(sk->fd, &m, 0);
! 1905: if (x < 0)
! 1906: {
! 1907: if (errno == ENOBUFS)
! 1908: {
! 1909: /*
! 1910: * Netlink reports some packets have been thrown away.
! 1911: * One day we might react to it by asking for route table
! 1912: * scan in near future.
! 1913: */
! 1914: log(L_WARN "Kernel dropped some netlink messages, will resync on next scan.");
! 1915: return 1; /* More data are likely to be ready */
! 1916: }
! 1917: else if (errno != EWOULDBLOCK)
! 1918: log(L_ERR "Netlink recvmsg: %m");
! 1919: return 0;
! 1920: }
! 1921: if (sa.nl_pid) /* It isn't from the kernel */
! 1922: {
! 1923: DBG("Non-kernel packet\n");
! 1924: return 1;
! 1925: }
! 1926: h = (void *) nl_async_rx_buffer;
! 1927: len = x;
! 1928: if (m.msg_flags & MSG_TRUNC)
! 1929: {
! 1930: log(L_WARN "Netlink got truncated asynchronous message");
! 1931: return 1;
! 1932: }
! 1933: while (NLMSG_OK(h, len))
! 1934: {
! 1935: nl_async_msg(h);
! 1936: h = NLMSG_NEXT(h, len);
! 1937: }
! 1938: if (len)
! 1939: log(L_WARN "nl_async_hook: Found packet remnant of size %d", len);
! 1940: return 1;
! 1941: }
! 1942:
! 1943: static void
! 1944: nl_async_err_hook(sock *sk, int e UNUSED)
! 1945: {
! 1946: nl_async_hook(sk, 0);
! 1947: }
! 1948:
! 1949: static void
! 1950: nl_open_async(void)
! 1951: {
! 1952: sock *sk;
! 1953: struct sockaddr_nl sa;
! 1954: int fd;
! 1955:
! 1956: if (nl_async_sk)
! 1957: return;
! 1958:
! 1959: DBG("KRT: Opening async netlink socket\n");
! 1960:
! 1961: fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
! 1962: if (fd < 0)
! 1963: {
! 1964: log(L_ERR "Unable to open asynchronous rtnetlink socket: %m");
! 1965: return;
! 1966: }
! 1967:
! 1968: bzero(&sa, sizeof(sa));
! 1969: sa.nl_family = AF_NETLINK;
! 1970: sa.nl_groups = RTMGRP_LINK |
! 1971: RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE |
! 1972: RTMGRP_IPV6_IFADDR | RTMGRP_IPV6_ROUTE;
! 1973:
! 1974: if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) < 0)
! 1975: {
! 1976: log(L_ERR "Unable to bind asynchronous rtnetlink socket: %m");
! 1977: close(fd);
! 1978: return;
! 1979: }
! 1980:
! 1981: nl_async_rx_buffer = xmalloc(NL_RX_SIZE);
! 1982:
! 1983: sk = nl_async_sk = sk_new(krt_pool);
! 1984: sk->type = SK_MAGIC;
! 1985: sk->rx_hook = nl_async_hook;
! 1986: sk->err_hook = nl_async_err_hook;
! 1987: sk->fd = fd;
! 1988: if (sk_open(sk) < 0)
! 1989: bug("Netlink: sk_open failed");
! 1990: }
! 1991:
! 1992:
! 1993: /*
! 1994: * Interface to the UNIX krt module
! 1995: */
! 1996:
! 1997: void
! 1998: krt_sys_io_init(void)
! 1999: {
! 2000: nl_linpool = lp_new_default(krt_pool);
! 2001: HASH_INIT(nl_table_map, krt_pool, 6);
! 2002: }
! 2003:
! 2004: int
! 2005: krt_sys_start(struct krt_proto *p)
! 2006: {
! 2007: struct krt_proto *old = HASH_FIND(nl_table_map, RTH, p->af, krt_table_id(p));
! 2008:
! 2009: if (old)
! 2010: {
! 2011: log(L_ERR "%s: Kernel table %u already registered by %s",
! 2012: p->p.name, krt_table_id(p), old->p.name);
! 2013: return 0;
! 2014: }
! 2015:
! 2016: HASH_INSERT2(nl_table_map, RTH, krt_pool, p);
! 2017:
! 2018: nl_open();
! 2019: nl_open_async();
! 2020:
! 2021: return 1;
! 2022: }
! 2023:
! 2024: void
! 2025: krt_sys_shutdown(struct krt_proto *p)
! 2026: {
! 2027: HASH_REMOVE2(nl_table_map, RTH, krt_pool, p);
! 2028: }
! 2029:
! 2030: int
! 2031: krt_sys_reconfigure(struct krt_proto *p UNUSED, struct krt_config *n, struct krt_config *o)
! 2032: {
! 2033: return (n->sys.table_id == o->sys.table_id) && (n->sys.metric == o->sys.metric);
! 2034: }
! 2035:
! 2036: void
! 2037: krt_sys_init_config(struct krt_config *cf)
! 2038: {
! 2039: cf->sys.table_id = RT_TABLE_MAIN;
! 2040: cf->sys.metric = 32;
! 2041: }
! 2042:
! 2043: void
! 2044: krt_sys_copy_config(struct krt_config *d, struct krt_config *s)
! 2045: {
! 2046: d->sys.table_id = s->sys.table_id;
! 2047: d->sys.metric = s->sys.metric;
! 2048: }
! 2049:
! 2050: static const char *krt_metrics_names[KRT_METRICS_MAX] = {
! 2051: NULL, "lock", "mtu", "window", "rtt", "rttvar", "sstresh", "cwnd", "advmss",
! 2052: "reordering", "hoplimit", "initcwnd", "features", "rto_min", "initrwnd", "quickack"
! 2053: };
! 2054:
! 2055: static const char *krt_features_names[KRT_FEATURES_MAX] = {
! 2056: "ecn", NULL, NULL, "allfrag"
! 2057: };
! 2058:
! 2059: int
! 2060: krt_sys_get_attr(eattr *a, byte *buf, int buflen UNUSED)
! 2061: {
! 2062: switch (a->id)
! 2063: {
! 2064: case EA_KRT_PREFSRC:
! 2065: bsprintf(buf, "prefsrc");
! 2066: return GA_NAME;
! 2067:
! 2068: case EA_KRT_REALM:
! 2069: bsprintf(buf, "realm");
! 2070: return GA_NAME;
! 2071:
! 2072: case EA_KRT_SCOPE:
! 2073: bsprintf(buf, "scope");
! 2074: return GA_NAME;
! 2075:
! 2076: case EA_KRT_LOCK:
! 2077: buf += bsprintf(buf, "lock:");
! 2078: ea_format_bitfield(a, buf, buflen, krt_metrics_names, 2, KRT_METRICS_MAX);
! 2079: return GA_FULL;
! 2080:
! 2081: case EA_KRT_FEATURES:
! 2082: buf += bsprintf(buf, "features:");
! 2083: ea_format_bitfield(a, buf, buflen, krt_features_names, 0, KRT_FEATURES_MAX);
! 2084: return GA_FULL;
! 2085:
! 2086: default:;
! 2087: int id = (int)EA_ID(a->id) - KRT_METRICS_OFFSET;
! 2088: if (id > 0 && id < KRT_METRICS_MAX)
! 2089: {
! 2090: bsprintf(buf, "%s", krt_metrics_names[id]);
! 2091: return GA_NAME;
! 2092: }
! 2093:
! 2094: return GA_UNKNOWN;
! 2095: }
! 2096: }
! 2097:
! 2098:
! 2099:
! 2100: void
! 2101: kif_sys_start(struct kif_proto *p UNUSED)
! 2102: {
! 2103: nl_open();
! 2104: nl_open_async();
! 2105: }
! 2106:
! 2107: void
! 2108: kif_sys_shutdown(struct kif_proto *p UNUSED)
! 2109: {
! 2110: }
! 2111:
! 2112: int
! 2113: kif_update_sysdep_addr(struct iface *i UNUSED)
! 2114: {
! 2115: return 0;
! 2116: }
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