/* $OpenBSD: kroute.c,v 1.141 2005/09/21 12:50:20 henning Exp $ */ /* * Copyright (c) 2003, 2004 Henning Brauer * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "bgpd.h" struct { u_int32_t rtseq; pid_t pid; int fib_sync; int fd; } kr_state; struct kroute_node { RB_ENTRY(kroute_node) entry; struct kroute r; }; struct kroute6_node { RB_ENTRY(kroute6_node) entry; struct kroute6 r; }; struct knexthop_node { RB_ENTRY(knexthop_node) entry; struct bgpd_addr nexthop; void *kroute; }; struct kif_kr { LIST_ENTRY(kif_kr) entry; struct kroute_node *kr; }; struct kif_kr6 { LIST_ENTRY(kif_kr6) entry; struct kroute6_node *kr; }; LIST_HEAD(kif_kr_head, kif_kr); LIST_HEAD(kif_kr6_head, kif_kr6); struct kif_node { RB_ENTRY(kif_node) entry; struct kif k; struct kif_kr_head kroute_l; struct kif_kr6_head kroute6_l; }; int kr_redistribute(int, struct kroute *); int kr_redistribute6(int, struct kroute6 *); int kroute_compare(struct kroute_node *, struct kroute_node *); int kroute6_compare(struct kroute6_node *, struct kroute6_node *); int knexthop_compare(struct knexthop_node *, struct knexthop_node *); int kif_compare(struct kif_node *, struct kif_node *); struct kroute_node *kroute_find(in_addr_t, u_int8_t); int kroute_insert(struct kroute_node *); int kroute_remove(struct kroute_node *); void kroute_clear(void); struct kroute6_node *kroute6_find(const struct in6_addr *, u_int8_t); int kroute6_insert(struct kroute6_node *); int kroute6_remove(struct kroute6_node *); void kroute6_clear(void); struct knexthop_node *knexthop_find(struct bgpd_addr *); int knexthop_insert(struct knexthop_node *); int knexthop_remove(struct knexthop_node *); void knexthop_clear(void); struct kif_node *kif_find(int); int kif_insert(struct kif_node *); int kif_remove(struct kif_node *); void kif_clear(void); int kif_kr_insert(struct kroute_node *); int kif_kr_remove(struct kroute_node *); int kif_kr6_insert(struct kroute6_node *); int kif_kr6_remove(struct kroute6_node *); int kif_validate(struct kif *); int kroute_validate(struct kroute *); int kroute6_validate(struct kroute6 *); void knexthop_validate(struct knexthop_node *); struct kroute_node *kroute_match(in_addr_t); struct kroute6_node *kroute6_match(struct in6_addr *); void kroute_detach_nexthop(struct knexthop_node *); int protect_lo(void); u_int8_t prefixlen_classful(in_addr_t); u_int8_t mask2prefixlen(in_addr_t); u_int8_t mask2prefixlen6(struct sockaddr_in6 *); void get_rtaddrs(int, struct sockaddr *, struct sockaddr **); void if_change(u_short, int, struct if_data *); void if_announce(void *); int send_rtmsg(int, int, struct kroute *); int send_rt6msg(int, int, struct kroute6 *); int dispatch_rtmsg(void); int fetchtable(void); int fetchifs(int); int dispatch_rtmsg_addr(struct rt_msghdr *, struct sockaddr *[RTAX_MAX]); RB_HEAD(kroute_tree, kroute_node) krt; RB_PROTOTYPE(kroute_tree, kroute_node, entry, kroute_compare) RB_GENERATE(kroute_tree, kroute_node, entry, kroute_compare) RB_HEAD(kroute6_tree, kroute6_node) krt6; RB_PROTOTYPE(kroute6_tree, kroute6_node, entry, kroute6_compare) RB_GENERATE(kroute6_tree, kroute6_node, entry, kroute6_compare) RB_HEAD(knexthop_tree, knexthop_node) knt; RB_PROTOTYPE(knexthop_tree, knexthop_node, entry, knexthop_compare) RB_GENERATE(knexthop_tree, knexthop_node, entry, knexthop_compare) RB_HEAD(kif_tree, kif_node) kit; RB_PROTOTYPE(kif_tree, kif_node, entry, kif_compare) RB_GENERATE(kif_tree, kif_node, entry, kif_compare) /* * exported functions */ int kr_init(int fs) { int opt = 0, rcvbuf, default_rcvbuf; socklen_t optlen; kr_state.fib_sync = fs; if ((kr_state.fd = socket(AF_ROUTE, SOCK_RAW, 0)) == -1) { log_warn("kr_init: socket"); return (-1); } /* not interested in my own messages */ if (setsockopt(kr_state.fd, SOL_SOCKET, SO_USELOOPBACK, &opt, sizeof(opt)) == -1) log_warn("kr_init: setsockopt"); /* not fatal */ /* grow receive buffer, don't wanna miss messages */ optlen = sizeof(default_rcvbuf); if (getsockopt(kr_state.fd, SOL_SOCKET, SO_RCVBUF, &default_rcvbuf, &optlen) == -1) log_warn("kr_init getsockopt SOL_SOCKET SO_RCVBUF"); else for (rcvbuf = MAX_RTSOCK_BUF; rcvbuf > default_rcvbuf && setsockopt(kr_state.fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, sizeof(rcvbuf)) == -1 && errno == ENOBUFS; rcvbuf /= 2) ; /* nothing */ kr_state.pid = getpid(); kr_state.rtseq = 1; RB_INIT(&krt); RB_INIT(&krt6); RB_INIT(&knt); RB_INIT(&kit); if (fetchifs(0) == -1) return (-1); if (fetchtable() == -1) return (-1); if (protect_lo() == -1) return (-1); return (kr_state.fd); } int kr_change(struct kroute_label *kl) { struct kroute_node *kr; int action = RTM_ADD; if ((kr = kroute_find(kl->kr.prefix.s_addr, kl->kr.prefixlen)) != NULL) { if (kr->r.flags & F_BGPD_INSERTED) action = RTM_CHANGE; else /* a non-bgp route already exists. not a problem */ return (0); } /* nexthop within 127/8 -> ignore silently */ if ((kl->kr.nexthop.s_addr & htonl(IN_CLASSA_NET)) == htonl(INADDR_LOOPBACK & IN_CLASSA_NET)) return (0); if (kr) rtlabel_unref(kr->r.labelid); kl->kr.labelid = rtlabel_name2id(kl->label); if (send_rtmsg(kr_state.fd, action, &kl->kr) == -1) return (-1); if (action == RTM_ADD) { if ((kr = calloc(1, sizeof(struct kroute_node))) == NULL) { log_warn("kr_change"); return (-1); } kr->r.prefix.s_addr = kl->kr.prefix.s_addr; kr->r.prefixlen = kl->kr.prefixlen; kr->r.nexthop.s_addr = kl->kr.nexthop.s_addr; kr->r.flags = kl->kr.flags | F_BGPD_INSERTED; kr->r.labelid = kl->kr.labelid; if (kroute_insert(kr) == -1) free(kr); } else { kr->r.nexthop.s_addr = kl->kr.nexthop.s_addr; kr->r.labelid = kl->kr.labelid; if (kl->kr.flags & F_BLACKHOLE) kr->r.flags |= F_BLACKHOLE; else kr->r.flags &= ~F_BLACKHOLE; if (kl->kr.flags & F_REJECT) kr->r.flags |= F_REJECT; else kr->r.flags &= ~F_REJECT; } return (0); } int kr_delete(struct kroute_label *kl) { struct kroute_node *kr; if ((kr = kroute_find(kl->kr.prefix.s_addr, kl->kr.prefixlen)) == NULL) return (0); if (!(kr->r.flags & F_BGPD_INSERTED)) return (0); /* nexthop within 127/8 -> ignore silently */ if ((kl->kr.nexthop.s_addr & htonl(IN_CLASSA_NET)) == htonl(INADDR_LOOPBACK & IN_CLASSA_NET)) return (0); if (send_rtmsg(kr_state.fd, RTM_DELETE, &kl->kr) == -1) return (-1); rtlabel_unref(kl->kr.labelid); if (kroute_remove(kr) == -1) return (-1); return (0); } int kr6_change(struct kroute6_label *kl) { struct kroute6_node *kr6; int action = RTM_ADD; if ((kr6 = kroute6_find(&kl->kr.prefix, kl->kr.prefixlen)) != NULL) { if (kr6->r.flags & F_BGPD_INSERTED) action = RTM_CHANGE; else /* a non-bgp route already exists. not a problem */ return (0); } /* nexthop to loopback -> ignore silently */ if (IN6_IS_ADDR_LOOPBACK(&kl->kr.nexthop)) return (0); if (kr6) rtlabel_unref(kr6->r.labelid); kl->kr.labelid = rtlabel_name2id(kl->label); if (send_rt6msg(kr_state.fd, action, &kl->kr) == -1) return (-1); if (action == RTM_ADD) { if ((kr6 = calloc(1, sizeof(struct kroute6_node))) == NULL) { log_warn("kr_change"); return (-1); } memcpy(&kr6->r.prefix, &kl->kr.prefix, sizeof(struct in6_addr)); kr6->r.prefixlen = kl->kr.prefixlen; memcpy(&kr6->r.nexthop, &kl->kr.nexthop, sizeof(struct in6_addr)); kr6->r.flags = kl->kr.flags | F_BGPD_INSERTED; kr6->r.labelid = kl->kr.labelid; if (kroute6_insert(kr6) == -1) free(kr6); } else { memcpy(&kr6->r.nexthop, &kl->kr.nexthop, sizeof(struct in6_addr)); kr6->r.labelid = kl->kr.labelid; if (kl->kr.flags & F_BLACKHOLE) kr6->r.flags |= F_BLACKHOLE; else kr6->r.flags &= ~F_BLACKHOLE; if (kl->kr.flags & F_REJECT) kr6->r.flags |= F_REJECT; else kr6->r.flags &= ~F_REJECT; } return (0); } int kr6_delete(struct kroute6_label *kl) { struct kroute6_node *kr6; if ((kr6 = kroute6_find(&kl->kr.prefix, kl->kr.prefixlen)) == NULL) return (0); if (!(kr6->r.flags & F_BGPD_INSERTED)) return (0); /* nexthop to loopback -> ignore silently */ if (IN6_IS_ADDR_LOOPBACK(&kl->kr.nexthop)) return (0); if (send_rt6msg(kr_state.fd, RTM_DELETE, &kl->kr) == -1) return (-1); rtlabel_unref(kl->kr.labelid); if (kroute6_remove(kr6) == -1) return (-1); return (0); } void kr_shutdown(void) { kr_fib_decouple(); knexthop_clear(); kroute_clear(); kroute6_clear(); kif_clear(); } void kr_fib_couple(void) { struct kroute_node *kr; struct kroute6_node *kr6; if (kr_state.fib_sync == 1) /* already coupled */ return; kr_state.fib_sync = 1; RB_FOREACH(kr, kroute_tree, &krt) if ((kr->r.flags & F_BGPD_INSERTED)) send_rtmsg(kr_state.fd, RTM_ADD, &kr->r); RB_FOREACH(kr6, kroute6_tree, &krt6) if ((kr6->r.flags & F_BGPD_INSERTED)) send_rt6msg(kr_state.fd, RTM_ADD, &kr6->r); log_info("kernel routing table coupled"); } void kr_fib_decouple(void) { struct kroute_node *kr; struct kroute6_node *kr6; if (kr_state.fib_sync == 0) /* already decoupled */ return; RB_FOREACH(kr, kroute_tree, &krt) if ((kr->r.flags & F_BGPD_INSERTED)) send_rtmsg(kr_state.fd, RTM_DELETE, &kr->r); RB_FOREACH(kr6, kroute6_tree, &krt6) if ((kr6->r.flags & F_BGPD_INSERTED)) send_rt6msg(kr_state.fd, RTM_DELETE, &kr6->r); kr_state.fib_sync = 0; log_info("kernel routing table decoupled"); } int kr_dispatch_msg(void) { return (dispatch_rtmsg()); } int kr_nexthop_add(struct bgpd_addr *addr) { struct knexthop_node *h; if ((h = knexthop_find(addr)) != NULL) { /* should not happen... this is acctually an error path */ struct kroute_nexthop nh; struct kroute_node *k; struct kroute6_node *k6; bzero(&nh, sizeof(nh)); memcpy(&nh.nexthop, addr, sizeof(nh.nexthop)); nh.valid = 1; if (h->kroute != NULL && addr->af == AF_INET) { k = h->kroute; nh.connected = k->r.flags & F_CONNECTED; if (k->r.nexthop.s_addr != 0) { nh.gateway.af = AF_INET; nh.gateway.v4.s_addr = k->r.nexthop.s_addr; } memcpy(&nh.kr.kr4, &k->r, sizeof(nh.kr.kr4)); } else if (h->kroute != NULL && addr->af == AF_INET6) { k6 = h->kroute; nh.connected = k6->r.flags & F_CONNECTED; if (memcmp(&k6->r.nexthop, &in6addr_any, sizeof(struct in6_addr)) != 0) { nh.gateway.af = AF_INET6; memcpy(&nh.gateway.v6, &k6->r.nexthop, sizeof(struct in6_addr)); } memcpy(&nh.kr.kr6, &k6->r, sizeof(nh.kr.kr6)); } send_nexthop_update(&nh); } else { if ((h = calloc(1, sizeof(struct knexthop_node))) == NULL) { log_warn("kr_nexthop_add"); return (-1); } memcpy(&h->nexthop, addr, sizeof(h->nexthop)); if (knexthop_insert(h) == -1) return (-1); } return (0); } void kr_nexthop_delete(struct bgpd_addr *addr) { struct knexthop_node *kn; if ((kn = knexthop_find(addr)) == NULL) return; knexthop_remove(kn); } void kr_show_route(struct imsg *imsg) { struct kroute_node *kr; struct kroute6_node *kr6; struct bgpd_addr *addr; int flags; sa_family_t af; struct ctl_show_nexthop snh; struct knexthop_node *h; struct kif_node *kif; u_short ifindex = 0; switch (imsg->hdr.type) { case IMSG_CTL_KROUTE: if (imsg->hdr.len != IMSG_HEADER_SIZE + sizeof(flags) + sizeof(af)) { log_warnx("kr_show_route: wrong imsg len"); return; } memcpy(&flags, imsg->data, sizeof(flags)); memcpy(&af, (char *)imsg->data + sizeof(flags), sizeof(af)); if (!af || af == AF_INET) RB_FOREACH(kr, kroute_tree, &krt) if (!flags || kr->r.flags & flags) send_imsg_session(IMSG_CTL_KROUTE, imsg->hdr.pid, &kr->r, sizeof(kr->r)); if (!af || af == AF_INET6) RB_FOREACH(kr6, kroute6_tree, &krt6) if (!flags || kr6->r.flags & flags) send_imsg_session(IMSG_CTL_KROUTE6, imsg->hdr.pid, &kr6->r, sizeof(kr6->r)); break; case IMSG_CTL_KROUTE_ADDR: if (imsg->hdr.len != IMSG_HEADER_SIZE + sizeof(struct bgpd_addr)) { log_warnx("kr_show_route: wrong imsg len"); return; } addr = imsg->data; kr = NULL; switch (addr->af) { case AF_INET: kr = kroute_match(addr->v4.s_addr); if (kr != NULL) send_imsg_session(IMSG_CTL_KROUTE, imsg->hdr.pid, &kr->r, sizeof(kr->r)); break; case AF_INET6: kr6 = kroute6_match(&addr->v6); if (kr6 != NULL) send_imsg_session(IMSG_CTL_KROUTE6, imsg->hdr.pid, &kr6->r, sizeof(kr6->r)); break; } break; case IMSG_CTL_SHOW_NEXTHOP: RB_FOREACH(h, knexthop_tree, &knt) { bzero(&snh, sizeof(snh)); memcpy(&snh.addr, &h->nexthop, sizeof(snh.addr)); if (h->kroute != NULL) { switch (h->nexthop.af) { case AF_INET: kr = h->kroute; snh.valid = kroute_validate(&kr->r); ifindex = kr->r.ifindex; break; case AF_INET6: kr6 = h->kroute; snh.valid = kroute6_validate(&kr6->r); ifindex = kr6->r.ifindex; break; } if ((kif = kif_find(ifindex)) != NULL) memcpy(&snh.kif, &kif->k, sizeof(snh.kif)); } send_imsg_session(IMSG_CTL_SHOW_NEXTHOP, imsg->hdr.pid, &snh, sizeof(snh)); } break; case IMSG_CTL_SHOW_INTERFACE: RB_FOREACH(kif, kif_tree, &kit) send_imsg_session(IMSG_CTL_SHOW_INTERFACE, imsg->hdr.pid, &kif->k, sizeof(kif->k)); break; default: /* nada */ break; } send_imsg_session(IMSG_CTL_END, imsg->hdr.pid, NULL, 0); } void kr_ifinfo(char *ifname) { struct kif_node *kif; RB_FOREACH(kif, kif_tree, &kit) if (!strcmp(ifname, kif->k.ifname)) { send_imsg_session(IMSG_IFINFO, 0, &kif->k, sizeof(kif->k)); return; } } struct redist_node { LIST_ENTRY(redist_node) entry; struct kroute *kr; struct kroute6 *kr6; }; LIST_HEAD(, redist_node) redistlist; int kr_redistribute(int type, struct kroute *kr) { struct redist_node *rn; u_int32_t a; if (!(kr->flags & F_KERNEL)) return (0); /* Dynamic routes are not redistributable. */ if (kr->flags & F_DYNAMIC) return (0); /* * We consider the loopback net, multicast and experimental addresses * as not redistributable. */ a = ntohl(kr->prefix.s_addr); if (IN_MULTICAST(a) || IN_BADCLASS(a) || (a >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) return (0); /* Consider networks with nexthop loopback as not redistributable. */ if (kr->nexthop.s_addr == htonl(INADDR_LOOPBACK)) return (0); /* * never allow 0.0.0.0/0 the default route can only be redistributed * with announce default. */ if (kr->prefix.s_addr == INADDR_ANY && kr->prefixlen == 0) return (0); /* Add or delete kr from list ... */ LIST_FOREACH(rn, &redistlist, entry) if (rn->kr == kr) break; switch (type) { case IMSG_NETWORK_ADD: if (rn == NULL) { if ((rn = calloc(1, sizeof(struct redist_node))) == NULL) { log_warn("kr_redistribute"); return (-1); } rn->kr = kr; LIST_INSERT_HEAD(&redistlist, rn, entry); } break; case IMSG_NETWORK_REMOVE: if (rn != NULL) { LIST_REMOVE(rn, entry); free(rn); } break; default: errno = EINVAL; return (-1); } return (bgpd_redistribute(type, kr, NULL)); } int kr_redistribute6(int type, struct kroute6 *kr6) { struct redist_node *rn; if (!(kr6->flags & F_KERNEL)) return (0); /* * We consider unspecified, loopback, multicast, link- and site-local, * IPv4 mapped and IPv4 compatible addresses as not redistributable. */ if (IN6_IS_ADDR_UNSPECIFIED(&kr6->prefix) || IN6_IS_ADDR_LOOPBACK(&kr6->prefix) || IN6_IS_ADDR_MULTICAST(&kr6->prefix) || IN6_IS_ADDR_LINKLOCAL(&kr6->prefix) || IN6_IS_ADDR_SITELOCAL(&kr6->prefix) || IN6_IS_ADDR_V4MAPPED(&kr6->prefix) || IN6_IS_ADDR_V4COMPAT(&kr6->prefix)) return (0); /* * Consider networks with nexthop loopback as not redistributable. */ if (IN6_IS_ADDR_LOOPBACK(&kr6->nexthop)) return (0); /* * never allow ::/0 the default route can only be redistributed * with announce default. */ if (memcmp(&kr6->prefix, &in6addr_any, sizeof(struct in6_addr)) == 0 && kr6->prefixlen == 0) return (0); /* Add or delete kr from list ... * using a linear list to store the redistributed networks will hurt * as soon as redistribute ospf comes but until then keep it simple. */ LIST_FOREACH(rn, &redistlist, entry) if (rn->kr6 == kr6) break; switch (type) { case IMSG_NETWORK_ADD: if (rn == NULL) { if ((rn = calloc(1, sizeof(struct redist_node))) == NULL) { log_warn("kr_redistribute"); return (-1); } rn->kr6 = kr6; LIST_INSERT_HEAD(&redistlist, rn, entry); } break; case IMSG_NETWORK_REMOVE: if (rn != NULL) { LIST_REMOVE(rn, entry); free(rn); } break; default: errno = EINVAL; return (-1); } return (bgpd_redistribute(type, NULL, kr6)); } int kr_redist_reload(void) { struct redist_node *rn; LIST_FOREACH(rn, &redistlist, entry) if (bgpd_redistribute(IMSG_NETWORK_ADD, rn->kr, rn->kr6) == -1) return (-1); return (0); } /* * RB-tree compare functions */ int kroute_compare(struct kroute_node *a, struct kroute_node *b) { if (ntohl(a->r.prefix.s_addr) < ntohl(b->r.prefix.s_addr)) return (-1); if (ntohl(a->r.prefix.s_addr) > ntohl(b->r.prefix.s_addr)) return (1); if (a->r.prefixlen < b->r.prefixlen) return (-1); if (a->r.prefixlen > b->r.prefixlen) return (1); return (0); } int kroute6_compare(struct kroute6_node *a, struct kroute6_node *b) { int i; for (i = 0; i < 16; i++) { if (a->r.prefix.s6_addr[i] < b->r.prefix.s6_addr[i]) return (-1); if (a->r.prefix.s6_addr[i] > b->r.prefix.s6_addr[i]) return (1); } if (a->r.prefixlen < b->r.prefixlen) return (-1); if (a->r.prefixlen > b->r.prefixlen) return (1); return (0); } int knexthop_compare(struct knexthop_node *a, struct knexthop_node *b) { u_int32_t r; if (a->nexthop.af != b->nexthop.af) return (b->nexthop.af - a->nexthop.af); switch (a->nexthop.af) { case AF_INET: if ((r = b->nexthop.addr32[0] - a->nexthop.addr32[0]) != 0) return (r); break; case AF_INET6: if ((r = b->nexthop.addr32[3] - a->nexthop.addr32[3]) != 0) return (r); if ((r = b->nexthop.addr32[2] - a->nexthop.addr32[2]) != 0) return (r); if ((r = b->nexthop.addr32[1] - a->nexthop.addr32[1]) != 0) return (r); if ((r = b->nexthop.addr32[0] - a->nexthop.addr32[0]) != 0) return (r); break; } return (0); } int kif_compare(struct kif_node *a, struct kif_node *b) { return (b->k.ifindex - a->k.ifindex); } /* * tree management functions */ struct kroute_node * kroute_find(in_addr_t prefix, u_int8_t prefixlen) { struct kroute_node s; s.r.prefix.s_addr = prefix; s.r.prefixlen = prefixlen; return (RB_FIND(kroute_tree, &krt, &s)); } int kroute_insert(struct kroute_node *kr) { struct knexthop_node *h; in_addr_t mask, ina; if (RB_INSERT(kroute_tree, &krt, kr) != NULL) { log_warnx("kroute_tree insert failed for %s/%u", inet_ntoa(kr->r.prefix), kr->r.prefixlen); free(kr); return (-1); } if (kr->r.flags & F_KERNEL) { mask = prefixlen2mask(kr->r.prefixlen); ina = ntohl(kr->r.prefix.s_addr); RB_FOREACH(h, knexthop_tree, &knt) if (h->nexthop.af == AF_INET && (ntohl(h->nexthop.v4.s_addr) & mask) == ina) knexthop_validate(h); if (kr->r.flags & F_CONNECTED) if (kif_kr_insert(kr) == -1) return (-1); kr_redistribute(IMSG_NETWORK_ADD, &kr->r); } return (0); } int kroute_remove(struct kroute_node *kr) { struct knexthop_node *s; if (RB_REMOVE(kroute_tree, &krt, kr) == NULL) { log_warnx("kroute_remove failed for %s/%u", inet_ntoa(kr->r.prefix), kr->r.prefixlen); return (-1); } /* check wether a nexthop depends on this kroute */ if ((kr->r.flags & F_KERNEL) && (kr->r.flags & F_NEXTHOP)) RB_FOREACH(s, knexthop_tree, &knt) if (s->kroute == kr) knexthop_validate(s); if (kr->r.flags & F_KERNEL) kr_redistribute(IMSG_NETWORK_REMOVE, &kr->r); if (kr->r.flags & F_CONNECTED) if (kif_kr_remove(kr) == -1) { free(kr); return (-1); } free(kr); return (0); } void kroute_clear(void) { struct kroute_node *kr; while ((kr = RB_MIN(kroute_tree, &krt)) != NULL) kroute_remove(kr); } struct kroute6_node * kroute6_find(const struct in6_addr *prefix, u_int8_t prefixlen) { struct kroute6_node s; memcpy(&s.r.prefix, prefix, sizeof(struct in6_addr)); s.r.prefixlen = prefixlen; return (RB_FIND(kroute6_tree, &krt6, &s)); } int kroute6_insert(struct kroute6_node *kr) { struct knexthop_node *h; struct in6_addr ina, inb; if (RB_INSERT(kroute6_tree, &krt6, kr) != NULL) { log_warnx("kroute_tree insert failed for %s/%u", log_in6addr(&kr->r.prefix), kr->r.prefixlen); free(kr); return (-1); } if (kr->r.flags & F_KERNEL) { inet6applymask(&ina, &kr->r.prefix, kr->r.prefixlen); RB_FOREACH(h, knexthop_tree, &knt) if (h->nexthop.af == AF_INET6) { inet6applymask(&inb, &h->nexthop.v6, kr->r.prefixlen); if (memcmp(&ina, &inb, sizeof(ina)) == 0) knexthop_validate(h); } if (kr->r.flags & F_CONNECTED) if (kif_kr6_insert(kr) == -1) return (-1); kr_redistribute6(IMSG_NETWORK_ADD, &kr->r); } return (0); } int kroute6_remove(struct kroute6_node *kr) { struct knexthop_node *s; if (RB_REMOVE(kroute6_tree, &krt6, kr) == NULL) { log_warnx("kroute_remove failed for %s/%u", log_in6addr(&kr->r.prefix), kr->r.prefixlen); return (-1); } /* check wether a nexthop depends on this kroute */ if ((kr->r.flags & F_KERNEL) && (kr->r.flags & F_NEXTHOP)) RB_FOREACH(s, knexthop_tree, &knt) if (s->kroute == kr) knexthop_validate(s); if (kr->r.flags & F_KERNEL) kr_redistribute6(IMSG_NETWORK_REMOVE, &kr->r); if (kr->r.flags & F_CONNECTED) if (kif_kr6_remove(kr) == -1) { free(kr); return (-1); } free(kr); return (0); } void kroute6_clear(void) { struct kroute6_node *kr; while ((kr = RB_MIN(kroute6_tree, &krt6)) != NULL) kroute6_remove(kr); } struct knexthop_node * knexthop_find(struct bgpd_addr *addr) { struct knexthop_node s; memcpy(&s.nexthop, addr, sizeof(s.nexthop)); return (RB_FIND(knexthop_tree, &knt, &s)); } int knexthop_insert(struct knexthop_node *kn) { if (RB_INSERT(knexthop_tree, &knt, kn) != NULL) { log_warnx("knexthop_tree insert failed for %s", log_addr(&kn->nexthop)); free(kn); return (-1); } knexthop_validate(kn); return (0); } int knexthop_remove(struct knexthop_node *kn) { kroute_detach_nexthop(kn); if (RB_REMOVE(knexthop_tree, &knt, kn) == NULL) { log_warnx("knexthop_remove failed for %s", log_addr(&kn->nexthop)); return (-1); } free(kn); return (0); } void knexthop_clear(void) { struct knexthop_node *kn; while ((kn = RB_MIN(knexthop_tree, &knt)) != NULL) knexthop_remove(kn); } struct kif_node * kif_find(int ifindex) { struct kif_node s; bzero(&s, sizeof(s)); s.k.ifindex = ifindex; return (RB_FIND(kif_tree, &kit, &s)); } int kif_insert(struct kif_node *kif) { LIST_INIT(&kif->kroute_l); LIST_INIT(&kif->kroute6_l); if (RB_INSERT(kif_tree, &kit, kif) != NULL) { log_warnx("RB_INSERT(kif_tree, &kit, kif)"); free(kif); return (-1); } return (0); } int kif_remove(struct kif_node *kif) { struct kif_kr *kkr; struct kif_kr6 *kkr6; if (RB_REMOVE(kif_tree, &kit, kif) == NULL) { log_warnx("RB_REMOVE(kif_tree, &kit, kif)"); return (-1); } while ((kkr = LIST_FIRST(&kif->kroute_l)) != NULL) { LIST_REMOVE(kkr, entry); kkr->kr->r.flags &= ~F_NEXTHOP; kroute_remove(kkr->kr); free(kkr); } while ((kkr6 = LIST_FIRST(&kif->kroute6_l)) != NULL) { LIST_REMOVE(kkr6, entry); kkr6->kr->r.flags &= ~F_NEXTHOP; kroute6_remove(kkr6->kr); free(kkr6); } free(kif); return (0); } void kif_clear(void) { struct kif_node *kif; while ((kif = RB_MIN(kif_tree, &kit)) != NULL) kif_remove(kif); } int kif_kr_insert(struct kroute_node *kr) { struct kif_node *kif; struct kif_kr *kkr; if ((kif = kif_find(kr->r.ifindex)) == NULL) { if (kr->r.ifindex) log_warnx("interface with index %u not found", kr->r.ifindex); return (0); } if (kif->k.nh_reachable) kr->r.flags &= ~F_DOWN; else kr->r.flags |= F_DOWN; if ((kkr = calloc(1, sizeof(struct kif_kr))) == NULL) { log_warn("kif_kr_insert"); return (-1); } kkr->kr = kr; LIST_INSERT_HEAD(&kif->kroute_l, kkr, entry); return (0); } int kif_kr_remove(struct kroute_node *kr) { struct kif_node *kif; struct kif_kr *kkr; if ((kif = kif_find(kr->r.ifindex)) == NULL) { if (kr->r.ifindex) log_warnx("interface with index %u not found", kr->r.ifindex); return (0); } for (kkr = LIST_FIRST(&kif->kroute_l); kkr != NULL && kkr->kr != kr; kkr = LIST_NEXT(kkr, entry)) ; /* nothing */ if (kkr == NULL) { log_warnx("can't remove connected route from interface " "with index %u: not found", kr->r.ifindex); return (-1); } LIST_REMOVE(kkr, entry); free(kkr); return (0); } int kif_kr6_insert(struct kroute6_node *kr) { struct kif_node *kif; struct kif_kr6 *kkr6; if ((kif = kif_find(kr->r.ifindex)) == NULL) { if (kr->r.ifindex) log_warnx("interface with index %u not found", kr->r.ifindex); return (0); } if (kif->k.nh_reachable) kr->r.flags &= ~F_DOWN; else kr->r.flags |= F_DOWN; if ((kkr6 = calloc(1, sizeof(struct kif_kr6))) == NULL) { log_warn("kif_kr6_insert"); return (-1); } kkr6->kr = kr; LIST_INSERT_HEAD(&kif->kroute6_l, kkr6, entry); return (0); } int kif_kr6_remove(struct kroute6_node *kr) { struct kif_node *kif; struct kif_kr6 *kkr6; if ((kif = kif_find(kr->r.ifindex)) == NULL) { if (kr->r.ifindex) log_warnx("interface with index %u not found", kr->r.ifindex); return (0); } for (kkr6 = LIST_FIRST(&kif->kroute6_l); kkr6 != NULL && kkr6->kr != kr; kkr6 = LIST_NEXT(kkr6, entry)) ; /* nothing */ if (kkr6 == NULL) { log_warnx("can't remove connected route from interface " "with index %u: not found", kr->r.ifindex); return (-1); } LIST_REMOVE(kkr6, entry); free(kkr6); return (0); } /* * nexthop validation */ int kif_validate(struct kif *kif) { if (!(kif->flags & IFF_UP)) return (0); /* * we treat link_state == LINK_STATE_UNKNOWN as valid, * not all interfaces have a concept of "link state" and/or * do not report up */ if (kif->link_state == LINK_STATE_DOWN) return (0); return (1); } int kroute_validate(struct kroute *kr) { struct kif_node *kif; if (kr->flags & (F_REJECT | F_BLACKHOLE)) return (0); if ((kif = kif_find(kr->ifindex)) == NULL) { if (kr->ifindex) log_warnx("interface with index %d not found, " "referenced from route for %s/%u", kr->ifindex, inet_ntoa(kr->prefix), kr->prefixlen); return (1); } return (kif->k.nh_reachable); } int kroute6_validate(struct kroute6 *kr) { struct kif_node *kif; if (kr->flags & (F_REJECT | F_BLACKHOLE)) return (0); if ((kif = kif_find(kr->ifindex)) == NULL) { if (kr->ifindex) log_warnx("interface with index %d not found, " "referenced from route for %s/%u", kr->ifindex, log_in6addr(&kr->prefix), kr->prefixlen); return (1); } return (kif->k.nh_reachable); } void knexthop_validate(struct knexthop_node *kn) { struct kroute_node *kr; struct kroute6_node *kr6; struct kroute_nexthop n; int was_valid = 0; if (kn->nexthop.af == AF_INET && (kr = kn->kroute) != NULL) was_valid = kroute_validate(&kr->r); if (kn->nexthop.af == AF_INET6 && (kr6 = kn->kroute) != NULL) was_valid = kroute6_validate(&kr6->r); bzero(&n, sizeof(n)); memcpy(&n.nexthop, &kn->nexthop, sizeof(n.nexthop)); kroute_detach_nexthop(kn); switch (kn->nexthop.af) { case AF_INET: if ((kr = kroute_match(kn->nexthop.v4.s_addr)) == NULL) { if (was_valid) send_nexthop_update(&n); } else { /* match */ if (kroute_validate(&kr->r)) { /* valid */ n.valid = 1; n.connected = kr->r.flags & F_CONNECTED; if ((n.gateway.v4.s_addr = kr->r.nexthop.s_addr) != 0) n.gateway.af = AF_INET; memcpy(&n.kr.kr4, &kr->r, sizeof(n.kr.kr4)); send_nexthop_update(&n); } else /* down */ if (was_valid) send_nexthop_update(&n); kn->kroute = kr; kr->r.flags |= F_NEXTHOP; } break; case AF_INET6: if ((kr6 = kroute6_match(&kn->nexthop.v6)) == NULL) { if (was_valid) send_nexthop_update(&n); } else { /* match */ if (kroute6_validate(&kr6->r)) { /* valid */ n.valid = 1; n.connected = kr6->r.flags & F_CONNECTED; if (memcmp(&kr6->r.nexthop, &in6addr_any, sizeof(struct in6_addr)) != 0) { n.gateway.af = AF_INET6; memcpy(&n.gateway.v6, &kr6->r.nexthop, sizeof(struct in6_addr)); } memcpy(&n.kr.kr6, &kr6->r, sizeof(n.kr.kr6)); send_nexthop_update(&n); } else /* down */ if (was_valid) send_nexthop_update(&n); kn->kroute = kr6; kr6->r.flags |= F_NEXTHOP; } break; } } struct kroute_node * kroute_match(in_addr_t key) { int i; struct kroute_node *kr; in_addr_t ina; ina = ntohl(key); /* we will never match the default route */ for (i = 32; i > 0; i--) if ((kr = kroute_find(htonl(ina & prefixlen2mask(i)), i)) != NULL) return (kr); /* if we don't have a match yet, try to find a default route */ if ((kr = kroute_find(0, 0)) != NULL) return (kr); return (NULL); } struct kroute6_node * kroute6_match(struct in6_addr *key) { int i; struct kroute6_node *kr6; struct in6_addr ina; /* we will never match the default route */ for (i = 128; i > 0; i--) { inet6applymask(&ina, key, i); if ((kr6 = kroute6_find(&ina, i)) != NULL) return (kr6); } /* if we don't have a match yet, try to find a default route */ if ((kr6 = kroute6_find(&in6addr_any, 0)) != NULL) return (kr6); return (NULL); } void kroute_detach_nexthop(struct knexthop_node *kn) { struct knexthop_node *s; struct kroute_node *k; struct kroute6_node *k6; /* * check wether there's another nexthop depending on this kroute * if not remove the flag */ if (kn->kroute == NULL) return; for (s = RB_MIN(knexthop_tree, &knt); s != NULL && s->kroute != kn->kroute; s = RB_NEXT(knexthop_tree, &knt, s)) ; /* nothing */ if (s == NULL) { switch (kn->nexthop.af) { case AF_INET: k = kn->kroute; k->r.flags &= ~F_NEXTHOP; break; case AF_INET6: k6 = kn->kroute; k6->r.flags &= ~F_NEXTHOP; break; } } kn->kroute = NULL; } /* * misc helpers */ int protect_lo(void) { struct kroute_node *kr; struct kroute6_node *kr6; /* special protection for 127/8 */ if ((kr = calloc(1, sizeof(struct kroute_node))) == NULL) { log_warn("protect_lo"); return (-1); } kr->r.prefix.s_addr = htonl(INADDR_LOOPBACK); kr->r.prefixlen = 8; kr->r.flags = F_KERNEL|F_CONNECTED; if (RB_INSERT(kroute_tree, &krt, kr) != NULL) free(kr); /* kernel route already there, no problem */ /* special protection for loopback */ if ((kr6 = calloc(1, sizeof(struct kroute6_node))) == NULL) { log_warn("protect_lo"); return (-1); } memcpy(&kr6->r.prefix, &in6addr_loopback, sizeof(kr6->r.prefix)); kr6->r.prefixlen = 128; kr->r.flags = F_KERNEL|F_CONNECTED; if (RB_INSERT(kroute6_tree, &krt6, kr6) != NULL) free(kr6); /* kernel route already there, no problem */ return (0); } u_int8_t prefixlen_classful(in_addr_t ina) { /* it hurt to write this. */ if (ina >= 0xf0000000U) /* class E */ return (32); else if (ina >= 0xe0000000U) /* class D */ return (4); else if (ina >= 0xc0000000U) /* class C */ return (24); else if (ina >= 0x80000000U) /* class B */ return (16); else /* class A */ return (8); } u_int8_t mask2prefixlen(in_addr_t ina) { if (ina == 0) return (0); else return (33 - ffs(ntohl(ina))); } u_int8_t mask2prefixlen6(struct sockaddr_in6 *sa_in6) { u_int8_t l = 0, i, len; /* * sin6_len is the size of the sockaddr so substract the offset of * the possibly truncated sin6_addr struct. */ len = sa_in6->sin6_len - (u_int8_t)(&((struct sockaddr_in6 *)NULL)->sin6_addr); for (i = 0; i < len; i++) { /* this "beauty" is adopted from sbin/route/show.c ... */ switch (sa_in6->sin6_addr.s6_addr[i]) { case 0xff: l += 8; break; case 0xfe: l += 7; return (l); case 0xfc: l += 6; return (l); case 0xf8: l += 5; return (l); case 0xf0: l += 4; return (l); case 0xe0: l += 3; return (l); case 0xc0: l += 2; return (l); case 0x80: l += 1; return (l); case 0x00: return (l); default: fatalx("non continguous inet6 netmask"); } } return (l); } in_addr_t prefixlen2mask(u_int8_t prefixlen) { if (prefixlen == 0) return (0); return (0xffffffff << (32 - prefixlen)); } struct in6_addr * prefixlen2mask6(u_int8_t prefixlen) { static struct in6_addr mask; int i; bzero(&mask, sizeof(mask)); for (i = 0; i < prefixlen / 8; i++) mask.s6_addr[i] = 0xff; i = prefixlen % 8; if (i) mask.s6_addr[prefixlen / 8] = 0xff00 >> i; return (&mask); } void inet6applymask(struct in6_addr *dest, const struct in6_addr *src, int prefixlen) { struct in6_addr mask; int i; bzero(&mask, sizeof(mask)); for (i = 0; i < prefixlen / 8; i++) mask.s6_addr[i] = 0xff; i = prefixlen % 8; if (i) mask.s6_addr[prefixlen / 8] = 0xff00 >> i; for (i = 0; i < 16; i++) dest->s6_addr[i] = src->s6_addr[i] & mask.s6_addr[i]; } #define ROUNDUP(a, size) \ (((a) & ((size) - 1)) ? (1 + ((a) | ((size) - 1))) : (a)) void get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info) { int i; for (i = 0; i < RTAX_MAX; i++) { if (addrs & (1 << i)) { rti_info[i] = sa; sa = (struct sockaddr *)((char *)(sa) + ROUNDUP(sa->sa_len, sizeof(long))); } else rti_info[i] = NULL; } } void if_change(u_short ifindex, int flags, struct if_data *ifd) { struct kif_node *kif; struct kif_kr *kkr; struct kif_kr6 *kkr6; struct kroute_nexthop nh; struct knexthop_node *n; u_int8_t reachable; if ((kif = kif_find(ifindex)) == NULL) { log_warnx("interface with index %u not found", ifindex); return; } kif->k.flags = flags; kif->k.link_state = ifd->ifi_link_state; kif->k.media_type = ifd->ifi_type; kif->k.baudrate = ifd->ifi_baudrate; send_imsg_session(IMSG_IFINFO, 0, &kif->k, sizeof(kif->k)); if ((reachable = kif_validate(&kif->k)) == kif->k.nh_reachable) return; /* nothing changed wrt nexthop validity */ kif->k.nh_reachable = reachable; LIST_FOREACH(kkr, &kif->kroute_l, entry) { if (reachable) kkr->kr->r.flags &= ~F_DOWN; else kkr->kr->r.flags |= F_DOWN; RB_FOREACH(n, knexthop_tree, &knt) if (n->kroute == kkr->kr) { bzero(&nh, sizeof(nh)); memcpy(&nh.nexthop, &n->nexthop, sizeof(nh.nexthop)); if (kroute_validate(&kkr->kr->r)) { nh.valid = 1; nh.connected = 1; if ((nh.gateway.v4.s_addr = kkr->kr->r.nexthop.s_addr) != 0) nh.gateway.af = AF_INET; } memcpy(&nh.kr.kr4, &kkr->kr->r, sizeof(nh.kr.kr4)); send_nexthop_update(&nh); } } LIST_FOREACH(kkr6, &kif->kroute6_l, entry) { if (reachable) kkr6->kr->r.flags &= ~F_DOWN; else kkr6->kr->r.flags |= F_DOWN; RB_FOREACH(n, knexthop_tree, &knt) if (n->kroute == kkr6->kr) { bzero(&nh, sizeof(nh)); memcpy(&nh.nexthop, &n->nexthop, sizeof(nh.nexthop)); if (kroute6_validate(&kkr6->kr->r)) { nh.valid = 1; nh.connected = 1; if (memcmp(&kkr6->kr->r.nexthop, &in6addr_any, sizeof(struct in6_addr))) { nh.gateway.af = AF_INET6; memcpy(&nh.gateway.v6, &kkr6->kr->r.nexthop, sizeof(struct in6_addr)); } } memcpy(&nh.kr.kr6, &kkr6->kr->r, sizeof(nh.kr.kr6)); send_nexthop_update(&nh); } } } void if_announce(void *msg) { struct if_announcemsghdr *ifan; struct kif_node *kif; ifan = msg; switch (ifan->ifan_what) { case IFAN_ARRIVAL: if ((kif = calloc(1, sizeof(struct kif_node))) == NULL) { log_warn("if_announce"); return; } kif->k.ifindex = ifan->ifan_index; strlcpy(kif->k.ifname, ifan->ifan_name, sizeof(kif->k.ifname)); kif_insert(kif); break; case IFAN_DEPARTURE: kif = kif_find(ifan->ifan_index); kif_remove(kif); break; } } /* * rtsock related functions */ int send_rtmsg(int fd, int action, struct kroute *kroute) { struct { struct rt_msghdr hdr; struct sockaddr_in prefix; struct sockaddr_in nexthop; struct sockaddr_in mask; struct sockaddr_rtlabel label; } r; if (kr_state.fib_sync == 0) return (0); bzero(&r, sizeof(r)); r.hdr.rtm_msglen = sizeof(r); r.hdr.rtm_version = RTM_VERSION; r.hdr.rtm_type = action; r.hdr.rtm_flags = RTF_PROTO1; if (kroute->flags & F_BLACKHOLE) r.hdr.rtm_flags |= RTF_BLACKHOLE; if (kroute->flags & F_REJECT) r.hdr.rtm_flags |= RTF_REJECT; r.hdr.rtm_seq = kr_state.rtseq++; /* overflow doesn't matter */ r.hdr.rtm_addrs = RTA_DST|RTA_GATEWAY|RTA_NETMASK|RTA_LABEL; r.prefix.sin_len = sizeof(r.prefix); r.prefix.sin_family = AF_INET; r.prefix.sin_addr.s_addr = kroute->prefix.s_addr; r.nexthop.sin_len = sizeof(r.nexthop); r.nexthop.sin_family = AF_INET; r.nexthop.sin_addr.s_addr = kroute->nexthop.s_addr; if (kroute->nexthop.s_addr != 0) r.hdr.rtm_flags |= RTF_GATEWAY; r.mask.sin_len = sizeof(r.mask); r.mask.sin_family = AF_INET; r.mask.sin_addr.s_addr = htonl(prefixlen2mask(kroute->prefixlen)); r.label.sr_len = sizeof(r.label); strlcpy(r.label.sr_label, rtlabel_id2name(kroute->labelid), sizeof(r.label.sr_label)); retry: if (write(fd, &r, sizeof(r)) == -1) { switch (errno) { case ESRCH: if (r.hdr.rtm_type == RTM_CHANGE) { r.hdr.rtm_type = RTM_ADD; goto retry; } else if (r.hdr.rtm_type == RTM_DELETE) { log_info("route %s/%u vanished before delete", inet_ntoa(kroute->prefix), kroute->prefixlen); return (0); } else { log_warnx("send_rtmsg: action %u, " "prefix %s/%u: %s", r.hdr.rtm_type, inet_ntoa(kroute->prefix), kroute->prefixlen, strerror(errno)); return (0); } break; default: log_warnx("send_rtmsg: action %u, prefix %s/%u: %s", r.hdr.rtm_type, inet_ntoa(kroute->prefix), kroute->prefixlen, strerror(errno)); return (0); } } return (0); } int send_rt6msg(int fd, int action, struct kroute6 *kroute) { struct { struct rt_msghdr hdr; struct sockaddr_in6 prefix; struct sockaddr_in6 nexthop; struct sockaddr_in6 mask; struct sockaddr_rtlabel label; } r; if (kr_state.fib_sync == 0) return (0); bzero(&r, sizeof(r)); r.hdr.rtm_msglen = sizeof(r); r.hdr.rtm_version = RTM_VERSION; r.hdr.rtm_type = action; r.hdr.rtm_flags = RTF_PROTO1; if (kroute->flags & F_BLACKHOLE) r.hdr.rtm_flags |= RTF_BLACKHOLE; if (kroute->flags & F_REJECT) r.hdr.rtm_flags |= RTF_REJECT; r.hdr.rtm_seq = kr_state.rtseq++; /* overflow doesn't matter */ r.hdr.rtm_addrs = RTA_DST|RTA_GATEWAY|RTA_NETMASK|RTA_LABEL; r.prefix.sin6_len = sizeof(r.prefix); r.prefix.sin6_family = AF_INET6; memcpy(&r.prefix.sin6_addr, &kroute->prefix, sizeof(struct in6_addr)); /* XXX scope does not matter or? */ r.nexthop.sin6_len = sizeof(r.nexthop); r.nexthop.sin6_family = AF_INET6; memcpy(&r.nexthop.sin6_addr, &kroute->nexthop, sizeof(struct in6_addr)); if (memcmp(&kroute->nexthop, &in6addr_any, sizeof(struct in6_addr))) r.hdr.rtm_flags |= RTF_GATEWAY; r.mask.sin6_len = sizeof(r.mask); r.mask.sin6_family = AF_INET6; memcpy(&r.mask.sin6_addr, prefixlen2mask6(kroute->prefixlen), sizeof(struct in6_addr)); r.label.sr_len = sizeof(r.label); strlcpy(r.label.sr_label, rtlabel_id2name(kroute->labelid), sizeof(r.label.sr_label)); retry: if (write(fd, &r, sizeof(r)) == -1) { switch (errno) { case ESRCH: if (r.hdr.rtm_type == RTM_CHANGE) { r.hdr.rtm_type = RTM_ADD; goto retry; } else if (r.hdr.rtm_type == RTM_DELETE) { log_info("route %s/%u vanished before delete", log_in6addr(&kroute->prefix), kroute->prefixlen); return (0); } else { log_warnx("send_rtmsg: action %u, " "prefix %s/%u: %s", r.hdr.rtm_type, log_in6addr(&kroute->prefix), kroute->prefixlen, strerror(errno)); return (0); } break; default: log_warnx("send_rtmsg: action %u, prefix %s/%u: %s", r.hdr.rtm_type, log_in6addr(&kroute->prefix), kroute->prefixlen, strerror(errno)); return (0); } } return (0); } int fetchtable(void) { size_t len; int mib[6]; char *buf, *next, *lim; struct rt_msghdr *rtm; struct sockaddr *sa, *gw, *rti_info[RTAX_MAX]; struct sockaddr_in *sa_in; struct sockaddr_in6 *sa_in6; struct kroute_node *kr = NULL; struct kroute6_node *kr6 = NULL; mib[0] = CTL_NET; mib[1] = AF_ROUTE; mib[2] = 0; mib[3] = 0; mib[4] = NET_RT_DUMP; mib[5] = 0; if (sysctl(mib, 6, NULL, &len, NULL, 0) == -1) { log_warn("sysctl"); return (-1); } if ((buf = malloc(len)) == NULL) { log_warn("fetchtable"); return (-1); } if (sysctl(mib, 6, buf, &len, NULL, 0) == -1) { log_warn("sysctl"); free(buf); return (-1); } lim = buf + len; for (next = buf; next < lim; next += rtm->rtm_msglen) { rtm = (struct rt_msghdr *)next; sa = (struct sockaddr *)(rtm + 1); get_rtaddrs(rtm->rtm_addrs, sa, rti_info); if ((sa = rti_info[RTAX_DST]) == NULL) continue; if (rtm->rtm_flags & RTF_LLINFO) /* arp cache */ continue; #ifdef RTF_MPATH if (rtm->rtm_flags & RTF_MPATH) /* multipath */ continue; #endif switch (sa->sa_family) { case AF_INET: if ((kr = calloc(1, sizeof(struct kroute_node))) == NULL) { log_warn("fetchtable"); free(buf); return (-1); } kr->r.flags = F_KERNEL; kr->r.ifindex = rtm->rtm_index; kr->r.prefix.s_addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr; sa_in = (struct sockaddr_in *)rti_info[RTAX_NETMASK]; if (rtm->rtm_flags & RTF_STATIC) kr->r.flags |= F_STATIC; if (rtm->rtm_flags & RTF_BLACKHOLE) kr->r.flags |= F_BLACKHOLE; if (rtm->rtm_flags & RTF_REJECT) kr->r.flags |= F_REJECT; if (rtm->rtm_flags & RTF_DYNAMIC) kr->r.flags |= F_DYNAMIC; if (sa_in != NULL) { if (sa_in->sin_len == 0) break; kr->r.prefixlen = mask2prefixlen(sa_in->sin_addr.s_addr); } else if (rtm->rtm_flags & RTF_HOST) kr->r.prefixlen = 32; else kr->r.prefixlen = prefixlen_classful(kr->r.prefix.s_addr); break; case AF_INET6: if ((kr6 = calloc(1, sizeof(struct kroute6_node))) == NULL) { log_warn("fetchtable"); free(buf); return (-1); } kr6->r.flags = F_KERNEL; kr6->r.ifindex = rtm->rtm_index; memcpy(&kr6->r.prefix, &((struct sockaddr_in6 *)sa)->sin6_addr, sizeof(kr6->r.prefix)); sa_in6 = (struct sockaddr_in6 *)rti_info[RTAX_NETMASK]; if (rtm->rtm_flags & RTF_STATIC) kr6->r.flags |= F_STATIC; if (rtm->rtm_flags & RTF_BLACKHOLE) kr6->r.flags |= F_BLACKHOLE; if (rtm->rtm_flags & RTF_REJECT) kr6->r.flags |= F_REJECT; if (rtm->rtm_flags & RTF_DYNAMIC) kr6->r.flags |= F_DYNAMIC; if (sa_in6 != NULL) { if (sa_in6->sin6_len == 0) break; kr6->r.prefixlen = mask2prefixlen6(sa_in6); } else if (rtm->rtm_flags & RTF_HOST) kr6->r.prefixlen = 128; else fatalx("INET6 route without netmask"); break; default: continue; } if ((gw = rti_info[RTAX_GATEWAY]) != NULL) switch (gw->sa_family) { case AF_INET: if (kr == NULL) fatalx("v4 gateway for !v4 dst?!"); kr->r.nexthop.s_addr = ((struct sockaddr_in *)gw)->sin_addr.s_addr; break; case AF_INET6: if (kr6 == NULL) fatalx("v6 gateway for !v6 dst?!"); memcpy(&kr6->r.nexthop, &((struct sockaddr_in6 *)gw)->sin6_addr, sizeof(kr6->r.nexthop)); break; case AF_LINK: if (sa->sa_family == AF_INET) kr->r.flags |= F_CONNECTED; else if (sa->sa_family == AF_INET6) kr6->r.flags |= F_CONNECTED; break; } if (sa->sa_family == AF_INET) kroute_insert(kr); else if (sa->sa_family == AF_INET6) kroute6_insert(kr6); } free(buf); return (0); } int fetchifs(int ifindex) { size_t len; int mib[6]; char *buf, *next, *lim; struct if_msghdr ifm; struct kif_node *kif; struct sockaddr *sa, *rti_info[RTAX_MAX]; struct sockaddr_dl *sdl; mib[0] = CTL_NET; mib[1] = AF_ROUTE; mib[2] = 0; mib[3] = AF_INET; mib[4] = NET_RT_IFLIST; mib[5] = ifindex; if (sysctl(mib, 6, NULL, &len, NULL, 0) == -1) { log_warn("sysctl"); return (-1); } if ((buf = malloc(len)) == NULL) { log_warn("fetchif"); return (-1); } if (sysctl(mib, 6, buf, &len, NULL, 0) == -1) { log_warn("sysctl"); free(buf); return (-1); } lim = buf + len; for (next = buf; next < lim; next += ifm.ifm_msglen) { memcpy(&ifm, next, sizeof(ifm)); if (ifm.ifm_type != RTM_IFINFO) continue; sa = (struct sockaddr *)(next + sizeof(ifm)); get_rtaddrs(ifm.ifm_addrs, sa, rti_info); if ((kif = calloc(1, sizeof(struct kif_node))) == NULL) { log_warn("fetchifs"); free(buf); return (-1); } kif->k.ifindex = ifm.ifm_index; kif->k.flags = ifm.ifm_flags; kif->k.link_state = ifm.ifm_data.ifi_link_state; kif->k.media_type = ifm.ifm_data.ifi_type; kif->k.baudrate = ifm.ifm_data.ifi_baudrate; kif->k.nh_reachable = kif_validate(&kif->k); if ((sa = rti_info[RTAX_IFP]) != NULL) if (sa->sa_family == AF_LINK) { sdl = (struct sockaddr_dl *)sa; if (sdl->sdl_nlen >= sizeof(kif->k.ifname)) strlcpy(kif->k.ifname, sdl->sdl_data, sizeof(kif->k.ifname)); else if (sdl->sdl_nlen > 0) strlcpy(kif->k.ifname, sdl->sdl_data, sdl->sdl_nlen + 1); } kif_insert(kif); } free(buf); return (0); } int dispatch_rtmsg(void) { char buf[RT_BUF_SIZE]; ssize_t n; char *next, *lim; struct rt_msghdr *rtm; struct if_msghdr ifm; struct sockaddr *sa, *rti_info[RTAX_MAX]; if ((n = read(kr_state.fd, &buf, sizeof(buf))) == -1) { log_warn("dispatch_rtmsg: read error"); return (-1); } if (n == 0) { log_warnx("routing socket closed"); return (-1); } lim = buf + n; for (next = buf; next < lim; next += rtm->rtm_msglen) { rtm = (struct rt_msghdr *)next; sa = (struct sockaddr *)(rtm + 1); get_rtaddrs(rtm->rtm_addrs, sa, rti_info); if (rtm->rtm_pid == kr_state.pid) /* cause by us */ continue; if (rtm->rtm_errno) /* failed attempts... */ continue; switch (rtm->rtm_type) { case RTM_ADD: case RTM_CHANGE: case RTM_DELETE: if (rtm->rtm_flags & RTF_LLINFO) /* arp cache */ continue; if (dispatch_rtmsg_addr(rtm, rti_info) == -1) return (-1); break; case RTM_IFINFO: memcpy(&ifm, next, sizeof(ifm)); if_change(ifm.ifm_index, ifm.ifm_flags, &ifm.ifm_data); break; case RTM_IFANNOUNCE: if_announce(next); break; default: /* ignore for now */ break; } } return (0); } int dispatch_rtmsg_addr(struct rt_msghdr *rtm, struct sockaddr *rti_info[RTAX_MAX]) { struct sockaddr *sa; struct sockaddr_in *sa_in; struct sockaddr_in6 *sa_in6; struct kroute_node *kr; struct kroute6_node *kr6; struct bgpd_addr prefix; int flags, oflags; u_int16_t ifindex; u_int8_t prefixlen; flags = F_KERNEL; ifindex = 0; prefixlen = 0; bzero(&prefix, sizeof(prefix)); if ((sa = rti_info[RTAX_DST]) == NULL) return (-1); if (rtm->rtm_flags & RTF_STATIC) flags |= F_STATIC; if (rtm->rtm_flags & RTF_BLACKHOLE) flags |= F_BLACKHOLE; if (rtm->rtm_flags & RTF_REJECT) flags |= F_REJECT; if (rtm->rtm_flags & RTF_DYNAMIC) flags |= F_DYNAMIC; prefix.af = sa->sa_family; switch (prefix.af) { case AF_INET: prefix.v4.s_addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr; sa_in = (struct sockaddr_in *)rti_info[RTAX_NETMASK]; if (sa_in != NULL) { if (sa_in->sin_len != 0) prefixlen = mask2prefixlen( sa_in->sin_addr.s_addr); } else if (rtm->rtm_flags & RTF_HOST) prefixlen = 32; else prefixlen = prefixlen_classful(prefix.v4.s_addr); break; case AF_INET6: memcpy(&prefix.v6, &((struct sockaddr_in6 *)sa)->sin6_addr, sizeof(struct in6_addr)); sa_in6 = (struct sockaddr_in6 *)rti_info[RTAX_NETMASK]; if (sa_in6 != NULL) { if (sa_in6->sin6_len != 0) prefixlen = mask2prefixlen6(sa_in6); } else if (rtm->rtm_flags & RTF_HOST) prefixlen = 128; else fatalx("in6 net addr without netmask"); break; default: return (0); } if (rtm->rtm_type == RTM_DELETE) { switch (prefix.af) { case AF_INET: if ((kr = kroute_find(prefix.v4.s_addr, prefixlen)) == NULL) return (0); if (!(kr->r.flags & F_KERNEL)) return (0); if (kroute_remove(kr) == -1) return (-1); break; case AF_INET6: if ((kr6 = kroute6_find(&prefix.v6, prefixlen)) == NULL) return (0); if (!(kr6->r.flags & F_KERNEL)) return (0); if (kroute6_remove(kr6) == -1) return (-1); break; } return (0); } if ((sa = rti_info[RTAX_GATEWAY]) != NULL) switch (sa->sa_family) { case AF_LINK: flags |= F_CONNECTED; ifindex = rtm->rtm_index; sa = NULL; break; } if (sa == NULL && !(flags & F_CONNECTED)) { log_warnx("dispatch_rtmsg no nexthop for %s/%u", log_addr(&prefix), prefixlen); return (0); } switch (prefix.af) { case AF_INET: sa_in = (struct sockaddr_in *)sa; if ((kr = kroute_find(prefix.v4.s_addr, prefixlen)) != NULL) { if (kr->r.flags & F_KERNEL) { if (sa_in != NULL) kr->r.nexthop.s_addr = sa_in->sin_addr.s_addr; else kr->r.nexthop.s_addr = 0; if (kr->r.flags & F_NEXTHOP) flags |= F_NEXTHOP; oflags = kr->r.flags; kr->r.flags = flags; if ((oflags & F_CONNECTED) && !(flags & F_CONNECTED)) { kif_kr_remove(kr); kr_redistribute(IMSG_NETWORK_REMOVE, &kr->r); } if ((flags & F_CONNECTED) && !(oflags & F_CONNECTED)) { kif_kr_insert(kr); kr_redistribute(IMSG_NETWORK_ADD, &kr->r); } } } else if (rtm->rtm_type == RTM_CHANGE) { log_warnx("change req for %s/%u: not in table", log_addr(&prefix), prefixlen); return (0); } else { if ((kr = calloc(1, sizeof(struct kroute_node))) == NULL) { log_warn("dispatch_rtmsg"); return (-1); } kr->r.prefix.s_addr = prefix.v4.s_addr; kr->r.prefixlen = prefixlen; if (sa_in != NULL) kr->r.nexthop.s_addr = sa_in->sin_addr.s_addr; else kr->r.nexthop.s_addr = 0; kr->r.flags = flags; kr->r.ifindex = ifindex; kroute_insert(kr); } break; case AF_INET6: sa_in6 = (struct sockaddr_in6 *)sa; if ((kr6 = kroute6_find(&prefix.v6, prefixlen)) != NULL) { if (kr6->r.flags & F_KERNEL) { if (sa_in6 != NULL) memcpy(&kr6->r.nexthop, &sa_in6->sin6_addr, sizeof(struct in6_addr)); else memcpy(&kr6->r.nexthop, &in6addr_any, sizeof(struct in6_addr)); if (kr6->r.flags & F_NEXTHOP) flags |= F_NEXTHOP; oflags = kr6->r.flags; kr6->r.flags = flags; if ((oflags & F_CONNECTED) && !(flags & F_CONNECTED)) { kif_kr6_remove(kr6); kr_redistribute6(IMSG_NETWORK_REMOVE, &kr6->r); } if ((flags & F_CONNECTED) && !(oflags & F_CONNECTED)) { kif_kr6_insert(kr6); kr_redistribute6(IMSG_NETWORK_ADD, &kr6->r); } } } else if (rtm->rtm_type == RTM_CHANGE) { log_warnx("change req for %s/%u: not in table", log_addr(&prefix), prefixlen); return (0); } else { if ((kr6 = calloc(1, sizeof(struct kroute6_node))) == NULL) { log_warn("dispatch_rtmsg"); return (-1); } memcpy(&kr6->r.prefix, &prefix.v6, sizeof(struct in6_addr)); kr6->r.prefixlen = prefixlen; if (sa_in6 != NULL) memcpy(&kr6->r.nexthop, &sa_in6->sin6_addr, sizeof(struct in6_addr)); else memcpy(&kr6->r.nexthop, &in6addr_any, sizeof(struct in6_addr)); kr6->r.flags = flags; kr6->r.ifindex = ifindex; kroute6_insert(kr6); } break; } return (0); }