/* $OpenBSD: kroute.c,v 1.14 2016/04/15 13:10:56 renato Exp $ */ /* * Copyright (c) 2015 Renato Westphal * Copyright (c) 2004 Esben Norby * 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 #include "eigrpd.h" #include "log.h" extern struct eigrpd_conf *eigrpd_conf; struct { uint32_t rtseq; pid_t pid; int fib_sync; int fd; struct event ev; unsigned int rdomain; } kr_state; struct kroute_node { TAILQ_ENTRY(kroute_node) entry; struct kroute_priority *kprio; /* back pointer */ struct kroute r; }; struct kroute_priority { TAILQ_ENTRY(kroute_priority) entry; struct kroute_prefix *kp; /* back pointer */ uint8_t priority; TAILQ_HEAD(, kroute_node) nexthops; }; struct kroute_prefix { RB_ENTRY(kroute_prefix) entry; int af; union eigrpd_addr prefix; uint8_t prefixlen; TAILQ_HEAD(plist, kroute_priority) priorities; }; struct kif_addr { TAILQ_ENTRY(kif_addr) entry; struct kaddr a; }; struct kif_node { RB_ENTRY(kif_node) entry; TAILQ_HEAD(, kif_addr) addrs; struct kif k; }; void kr_redist_remove(struct kroute *); int kr_redist_eval(struct kroute *); void kr_redistribute(struct kroute_prefix *); int kroute_compare(struct kroute_prefix *, struct kroute_prefix *); struct kroute_prefix *kroute_find_prefix(int, union eigrpd_addr *, uint8_t); struct kroute_priority *kroute_find_prio(struct kroute_prefix *, uint8_t); struct kroute_node *kroute_find_gw(struct kroute_priority *, union eigrpd_addr *); struct kroute_node *kroute_insert(struct kroute *); int kroute_remove(struct kroute *); void kroute_clear(void); int kif_compare(struct kif_node *, struct kif_node *); struct kif_node *kif_find(unsigned short); struct kif_node *kif_insert(unsigned short); int kif_remove(struct kif_node *); struct kif *kif_update(unsigned short, int, struct if_data *, struct sockaddr_dl *); int kif_validate(unsigned short); void protect_lo(void); uint8_t prefixlen_classful(in_addr_t); void get_rtaddrs(int, struct sockaddr *, struct sockaddr **); void if_change(unsigned short, int, struct if_data *, struct sockaddr_dl *); void if_newaddr(unsigned short, struct sockaddr *, struct sockaddr *, struct sockaddr *); void if_deladdr(unsigned short, struct sockaddr *, struct sockaddr *, struct sockaddr *); void if_announce(void *); int send_rtmsg(int, int, struct kroute *); int dispatch_rtmsg(void); int fetchtable(void); int fetchifs(void); int rtmsg_process(char *, size_t); int rtmsg_process_route(struct rt_msghdr *, struct sockaddr *[RTAX_MAX]); RB_HEAD(kroute_tree, kroute_prefix) krt = RB_INITIALIZER(&krt); RB_PROTOTYPE(kroute_tree, kroute_prefix, entry, kroute_compare) RB_GENERATE(kroute_tree, kroute_prefix, entry, kroute_compare) RB_HEAD(kif_tree, kif_node) kit = RB_INITIALIZER(&kit); RB_PROTOTYPE(kif_tree, kif_node, entry, kif_compare) RB_GENERATE(kif_tree, kif_node, entry, kif_compare) int kif_init(void) { if (fetchifs() == -1) return (-1); return (0); } int kr_init(int fs, unsigned int rdomain) { int opt = 0, rcvbuf, default_rcvbuf; socklen_t optlen; kr_state.fib_sync = fs; kr_state.rdomain = rdomain; if ((kr_state.fd = socket(AF_ROUTE, SOCK_RAW | SOCK_CLOEXEC | SOCK_NONBLOCK, 0)) == -1) { log_warn("%s: socket", __func__); return (-1); } /* not interested in my own messages */ if (setsockopt(kr_state.fd, SOL_SOCKET, SO_USELOOPBACK, &opt, sizeof(opt)) == -1) log_warn("%s: setsockopt(SO_USELOOPBACK)", __func__); /* 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("%s: getsockopt SOL_SOCKET SO_RCVBUF", __func__); 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; if (fetchtable() == -1) return (-1); protect_lo(); event_set(&kr_state.ev, kr_state.fd, EV_READ | EV_PERSIST, kr_dispatch_msg, NULL); event_add(&kr_state.ev, NULL); return (0); } void kif_redistribute(void) { struct kif_node *kif; struct kif_addr *ka; RB_FOREACH(kif, kif_tree, &kit) { main_imsg_compose_eigrpe(IMSG_IFINFO, 0, &kif->k, sizeof(struct kif)); TAILQ_FOREACH(ka, &kif->addrs, entry) { main_imsg_compose_eigrpe(IMSG_NEWADDR, 0, &ka->a, sizeof(ka->a)); } } } int kr_change(struct kroute *kr) { struct kroute_prefix *kp; struct kroute_priority *kprio; struct kroute_node *kn; int action = RTM_ADD; kp = kroute_find_prefix(kr->af, &kr->prefix, kr->prefixlen); if (kp == NULL) kn = kroute_insert(kr); else { kprio = kroute_find_prio(kp, kr->priority); if (kprio == NULL) kn = kroute_insert(kr); else { kn = kroute_find_gw(kprio, &kr->nexthop); if (kn == NULL) kn = kroute_insert(kr); else action = RTM_CHANGE; } } /* send update */ if (send_rtmsg(kr_state.fd, action, kr) == -1) return (-1); kn->r.flags |= F_EIGRPD_INSERTED; return (0); } int kr_delete(struct kroute *kr) { struct kroute_prefix *kp; struct kroute_priority *kprio; struct kroute_node *kn; kp = kroute_find_prefix(kr->af, &kr->prefix, kr->prefixlen); if (kp == NULL) return (0); kprio = kroute_find_prio(kp, kr->priority); if (kprio == NULL) return (0); kn = kroute_find_gw(kprio, &kr->nexthop); if (kn == NULL) return (0); if (!(kn->r.flags & F_EIGRPD_INSERTED)) return (0); if (send_rtmsg(kr_state.fd, RTM_DELETE, &kn->r) == -1) return (-1); if (kroute_remove(kr) == -1) return (-1); return (0); } void kr_shutdown(void) { kr_fib_decouple(); kroute_clear(); kif_clear(); } void kr_fib_couple(void) { struct kroute_prefix *kp; struct kroute_priority *kprio; struct kroute_node *kn; if (kr_state.fib_sync == 1) /* already coupled */ return; kr_state.fib_sync = 1; RB_FOREACH(kp, kroute_tree, &krt) TAILQ_FOREACH(kprio, &kp->priorities, entry) TAILQ_FOREACH(kn, &kprio->nexthops, entry) { if (!(kn->r.flags & F_EIGRPD_INSERTED)) continue; send_rtmsg(kr_state.fd, RTM_ADD, &kn->r); } log_info("kernel routing table coupled"); } void kr_fib_decouple(void) { struct kroute_prefix *kp; struct kroute_priority *kprio; struct kroute_node *kn; if (kr_state.fib_sync == 0) /* already decoupled */ return; RB_FOREACH(kp, kroute_tree, &krt) TAILQ_FOREACH(kprio, &kp->priorities, entry) TAILQ_FOREACH(kn, &kprio->nexthops, entry) { if (!(kn->r.flags & F_EIGRPD_INSERTED)) continue; send_rtmsg(kr_state.fd, RTM_DELETE, &kn->r); } kr_state.fib_sync = 0; log_info("kernel routing table decoupled"); } /* ARGSUSED */ void kr_dispatch_msg(int fd, short event, void *bula) { if (dispatch_rtmsg() == -1) event_loopexit(NULL); } void kr_show_route(struct imsg *imsg) { struct kroute_prefix *kp; struct kroute_priority *kprio; struct kroute_node *kn; struct kroute kr; int flags; if (imsg->hdr.len != IMSG_HEADER_SIZE + sizeof(flags)) { log_warnx("%s: wrong imsg len", __func__); return; } memcpy(&flags, imsg->data, sizeof(flags)); RB_FOREACH(kp, kroute_tree, &krt) TAILQ_FOREACH(kprio, &kp->priorities, entry) TAILQ_FOREACH(kn, &kprio->nexthops, entry) { if (flags && !(kn->r.flags & flags)) continue; kr = kn->r; if (kr.priority == eigrpd_conf->fib_priority_external) kr.flags |= F_CTL_EXTERNAL; main_imsg_compose_eigrpe(IMSG_CTL_KROUTE, imsg->hdr.pid, &kr, sizeof(kr)); } main_imsg_compose_eigrpe(IMSG_CTL_END, imsg->hdr.pid, NULL, 0); } void kr_ifinfo(char *ifname, pid_t pid) { struct kif_node *kif; RB_FOREACH(kif, kif_tree, &kit) if (ifname == NULL || !strcmp(ifname, kif->k.ifname)) { main_imsg_compose_eigrpe(IMSG_CTL_IFINFO, pid, &kif->k, sizeof(kif->k)); } main_imsg_compose_eigrpe(IMSG_CTL_END, pid, NULL, 0); } void kr_redist_remove(struct kroute *kr) { /* was the route redistributed? */ if (!(kr->flags & F_REDISTRIBUTED)) return; /* remove redistributed flag */ kr->flags &= ~F_REDISTRIBUTED; main_imsg_compose_rde(IMSG_NETWORK_DEL, 0, kr, sizeof(*kr)); } int kr_redist_eval(struct kroute *kr) { /* Only non-eigrpd routes are considered for redistribution. */ if (!(kr->flags & F_KERNEL)) goto dont_redistribute; /* Dynamic routes are not redistributable. */ if (kr->flags & F_DYNAMIC) goto dont_redistribute; /* filter-out non-redistributable addresses */ if (bad_addr(kr->af, &kr->prefix) || (kr->af == AF_INET6 && IN6_IS_SCOPE_EMBED(&kr->prefix.v6))) goto dont_redistribute; /* interface is not up and running so don't announce */ if (kr->flags & F_DOWN) goto dont_redistribute; /* * Consider networks with nexthop loopback as not redistributable * unless it is a reject or blackhole route. */ switch (kr->af) { case AF_INET: if (kr->nexthop.v4.s_addr == htonl(INADDR_LOOPBACK) && !(kr->flags & (F_BLACKHOLE|F_REJECT))) goto dont_redistribute; break; case AF_INET6: if (IN6_IS_ADDR_LOOPBACK(&kr->nexthop.v6) && !(kr->flags & (F_BLACKHOLE|F_REJECT))) goto dont_redistribute; break; default: log_debug("%s: unexpected address-family", __func__); break; } /* prefix should be redistributed */ kr->flags |= F_REDISTRIBUTED; main_imsg_compose_rde(IMSG_NETWORK_ADD, 0, kr, sizeof(*kr)); return (1); dont_redistribute: kr_redist_remove(kr); return (0); } void kr_redistribute(struct kroute_prefix *kp) { struct kroute_priority *kprio; struct kroute_node *kn; /* only the highest prio route can be redistributed */ TAILQ_FOREACH_REVERSE(kprio, &kp->priorities, plist, entry) { if (kprio == TAILQ_FIRST(&kp->priorities)) { TAILQ_FOREACH(kn, &kprio->nexthops, entry) /* pick just one entry in case of multipath */ if (kr_redist_eval(&kn->r)) break; } else { TAILQ_FOREACH(kn, &kprio->nexthops, entry) kr_redist_remove(&kn->r); } } } int kroute_compare(struct kroute_prefix *a, struct kroute_prefix *b) { int addrcmp; if (a->af < b->af) return (-1); if (a->af > b->af) return (1); addrcmp = eigrp_addrcmp(a->af, &a->prefix, &b->prefix); if (addrcmp != 0) return (addrcmp); if (a->prefixlen < b->prefixlen) return (-1); if (a->prefixlen > b->prefixlen) return (1); return (0); } /* tree management */ struct kroute_prefix * kroute_find_prefix(int af, union eigrpd_addr *prefix, uint8_t prefixlen) { struct kroute_prefix s; s.af = af; s.prefix = *prefix; s.prefixlen = prefixlen; return (RB_FIND(kroute_tree, &krt, &s)); } struct kroute_priority * kroute_find_prio(struct kroute_prefix *kp, uint8_t prio) { struct kroute_priority *kprio; /* RTP_ANY here picks the lowest priority node */ if (prio == RTP_ANY) return (TAILQ_FIRST(&kp->priorities)); TAILQ_FOREACH(kprio, &kp->priorities, entry) if (kprio->priority == prio) return (kprio); return (NULL); } struct kroute_node * kroute_find_gw(struct kroute_priority *kprio, union eigrpd_addr *nh) { struct kroute_node *kn; TAILQ_FOREACH(kn, &kprio->nexthops, entry) if (eigrp_addrcmp(kprio->kp->af, &kn->r.nexthop, nh) == 0) return (kn); return (NULL); } struct kroute_node * kroute_insert(struct kroute *kr) { struct kroute_prefix *kp; struct kroute_priority *kprio, *tmp; struct kroute_node *kn; kp = kroute_find_prefix(kr->af, &kr->prefix, kr->prefixlen); if (kp == NULL) { kp = calloc(1, sizeof((*kp))); if (kp == NULL) fatal("kroute_insert"); kp->af = kr->af; kp->prefix = kr->prefix; kp->prefixlen = kr->prefixlen; TAILQ_INIT(&kp->priorities); RB_INSERT(kroute_tree, &krt, kp); } kprio = kroute_find_prio(kp, kr->priority); if (kprio == NULL) { kprio = calloc(1, sizeof(*kprio)); if (kprio == NULL) fatal("kroute_insert"); kprio->kp = kp; kprio->priority = kr->priority; TAILQ_INIT(&kprio->nexthops); /* lower priorities first */ TAILQ_FOREACH(tmp, &kp->priorities, entry) if (tmp->priority > kprio->priority) break; if (tmp) TAILQ_INSERT_BEFORE(tmp, kprio, entry); else TAILQ_INSERT_TAIL(&kp->priorities, kprio, entry); } kn = kroute_find_gw(kprio, &kr->nexthop); if (kn == NULL) { kn = calloc(1, sizeof(*kn)); if (kn == NULL) fatal("kroute_insert"); kn->kprio = kprio; kn->r = *kr; TAILQ_INSERT_TAIL(&kprio->nexthops, kn, entry); } if (!(kr->flags & F_KERNEL)) { /* don't validate or redistribute eigrp route */ kr->flags &= ~F_DOWN; return (kn); } if (kif_validate(kr->ifindex)) kr->flags &= ~F_DOWN; else kr->flags |= F_DOWN; kr_redistribute(kp); return (kn); } int kroute_remove(struct kroute *kr) { struct kroute_prefix *kp; struct kroute_priority *kprio; struct kroute_node *kn; kp = kroute_find_prefix(kr->af, &kr->prefix, kr->prefixlen); if (kp == NULL) goto notfound; kprio = kroute_find_prio(kp, kr->priority); if (kprio == NULL) goto notfound; kn = kroute_find_gw(kprio, &kr->nexthop); if (kn == NULL) goto notfound; kr_redist_remove(&kn->r); TAILQ_REMOVE(&kprio->nexthops, kn, entry); free(kn); if (TAILQ_EMPTY(&kprio->nexthops)) { TAILQ_REMOVE(&kp->priorities, kprio, entry); free(kprio); } if (TAILQ_EMPTY(&kp->priorities)) { if (RB_REMOVE(kroute_tree, &krt, kp) == NULL) { log_warnx("%s failed for %s/%u", __func__, log_addr(kr->af, &kr->prefix), kp->prefixlen); return (-1); } free(kp); } else kr_redistribute(kp); return (0); notfound: log_warnx("%s failed to find %s/%u", __func__, log_addr(kr->af, &kr->prefix), kr->prefixlen); return (-1); } void kroute_clear(void) { struct kroute_prefix *kp; struct kroute_priority *kprio; struct kroute_node *kn; while ((kp = RB_MIN(kroute_tree, &krt)) != NULL) { while ((kprio = TAILQ_FIRST(&kp->priorities)) != NULL) { while ((kn = TAILQ_FIRST(&kprio->nexthops)) != NULL) { TAILQ_REMOVE(&kprio->nexthops, kn, entry); free(kn); } TAILQ_REMOVE(&kp->priorities, kprio, entry); free(kprio); } RB_REMOVE(kroute_tree, &krt, kp); free(kp); } } int kif_compare(struct kif_node *a, struct kif_node *b) { return (b->k.ifindex - a->k.ifindex); } /* tree management */ struct kif_node * kif_find(unsigned short ifindex) { struct kif_node s; memset(&s, 0, sizeof(s)); s.k.ifindex = ifindex; return (RB_FIND(kif_tree, &kit, &s)); } struct kif * kif_findname(char *ifname) { struct kif_node *kif; RB_FOREACH(kif, kif_tree, &kit) if (!strcmp(ifname, kif->k.ifname)) return (&kif->k); return (NULL); } struct kif_node * kif_insert(unsigned short ifindex) { struct kif_node *kif; if ((kif = calloc(1, sizeof(struct kif_node))) == NULL) return (NULL); kif->k.ifindex = ifindex; TAILQ_INIT(&kif->addrs); if (RB_INSERT(kif_tree, &kit, kif) != NULL) fatalx("kif_insert: RB_INSERT"); return (kif); } int kif_remove(struct kif_node *kif) { struct kif_addr *ka; if (RB_REMOVE(kif_tree, &kit, kif) == NULL) { log_warnx("%s failed for inteface %s", __func__, kif->k.ifname); return (-1); } while ((ka = TAILQ_FIRST(&kif->addrs)) != NULL) { TAILQ_REMOVE(&kif->addrs, ka, entry); free(ka); } free(kif); return (0); } void kif_clear(void) { struct kif_node *kif; while ((kif = RB_MIN(kif_tree, &kit)) != NULL) kif_remove(kif); } struct kif * kif_update(unsigned short ifindex, int flags, struct if_data *ifd, struct sockaddr_dl *sdl) { struct kif_node *kif; if ((kif = kif_find(ifindex)) == NULL) { if ((kif = kif_insert(ifindex)) == NULL) return (NULL); kif->k.nh_reachable = (flags & IFF_UP) && LINK_STATE_IS_UP(ifd->ifi_link_state); } kif->k.flags = flags; kif->k.link_state = ifd->ifi_link_state; kif->k.if_type = ifd->ifi_type; kif->k.baudrate = ifd->ifi_baudrate; kif->k.mtu = ifd->ifi_mtu; if (sdl && sdl->sdl_family == AF_LINK) { if (sdl->sdl_nlen >= sizeof(kif->k.ifname)) memcpy(kif->k.ifname, sdl->sdl_data, sizeof(kif->k.ifname) - 1); else if (sdl->sdl_nlen > 0) memcpy(kif->k.ifname, sdl->sdl_data, sdl->sdl_nlen); /* string already terminated via calloc() */ } return (&kif->k); } int kif_validate(unsigned short ifindex) { struct kif_node *kif; if ((kif = kif_find(ifindex)) == NULL) return (0); return (kif->k.nh_reachable); } /* misc */ void protect_lo(void) { struct kroute kr4, kr6; /* special protection for 127/8 */ memset(&kr4, 0, sizeof(kr4)); kr4.af = AF_INET; kr4.prefix.v4.s_addr = htonl(INADDR_LOOPBACK & IN_CLASSA_NET); kr4.prefixlen = 8; kr4.flags = F_KERNEL|F_CONNECTED; kroute_insert(&kr4); /* special protection for ::1 */ memset(&kr6, 0, sizeof(kr6)); kr6.af = AF_INET6; kr6.prefix.v6 = in6addr_loopback; kr6.prefixlen = 128; kr6.flags = F_KERNEL|F_CONNECTED; kroute_insert(&kr6); } /* misc */ uint8_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); } #define ROUNDUP(a) \ (((a) & (sizeof(long) - 1)) ? (1 + ((a) | (sizeof(long) - 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)); } else rti_info[i] = NULL; } } void if_change(unsigned short ifindex, int flags, struct if_data *ifd, struct sockaddr_dl *sdl) { struct kroute_prefix *kp; struct kroute_priority *kprio; struct kroute_node *kn; struct kif *kif; uint8_t reachable; if ((kif = kif_update(ifindex, flags, ifd, sdl)) == NULL) { log_warn("%s: kif_update(%u)", __func__, ifindex); return; } reachable = (kif->flags & IFF_UP) && LINK_STATE_IS_UP(kif->link_state); if (reachable == kif->nh_reachable) return; /* nothing changed wrt nexthop validity */ kif->nh_reachable = reachable; /* notify eigrpe about link state */ main_imsg_compose_eigrpe(IMSG_IFINFO, 0, kif, sizeof(struct kif)); /* notify rde about link going down */ if (!kif->nh_reachable) main_imsg_compose_rde(IMSG_IFDOWN, 0, kif, sizeof(struct kif)); /* update redistribute list */ RB_FOREACH(kp, kroute_tree, &krt) { TAILQ_FOREACH(kprio, &kp->priorities, entry) { TAILQ_FOREACH(kn, &kprio->nexthops, entry) { if (kn->r.ifindex != ifindex) continue; if (reachable) kn->r.flags &= ~F_DOWN; else kn->r.flags |= F_DOWN; } } kr_redistribute(kp); } } void if_newaddr(unsigned short ifindex, struct sockaddr *ifa, struct sockaddr *mask, struct sockaddr *brd) { struct kif_node *kif; struct sockaddr_in *ifa4, *mask4, *brd4; struct sockaddr_in6 *ifa6, *mask6, *brd6; struct kif_addr *ka; if (ifa == NULL) return; if ((kif = kif_find(ifindex)) == NULL) { log_warnx("%s: corresponding if %d not found", __func__, ifindex); return; } switch (ifa->sa_family) { case AF_INET: ifa4 = (struct sockaddr_in *) ifa; mask4 = (struct sockaddr_in *) mask; brd4 = (struct sockaddr_in *) brd; /* filter out unwanted addresses */ if (bad_addr_v4(ifa4->sin_addr)) return; if ((ka = calloc(1, sizeof(struct kif_addr))) == NULL) fatal("if_newaddr"); ka->a.addr.v4 = ifa4->sin_addr; if (mask4) ka->a.prefixlen = mask2prefixlen(mask4->sin_addr.s_addr); if (brd4) ka->a.dstbrd.v4 = brd4->sin_addr; break; case AF_INET6: ifa6 = (struct sockaddr_in6 *) ifa; mask6 = (struct sockaddr_in6 *) mask; brd6 = (struct sockaddr_in6 *) brd; /* We only care about link-local and global-scope. */ if (bad_addr_v6(&ifa6->sin6_addr)) return; clearscope(&ifa6->sin6_addr); if ((ka = calloc(1, sizeof(struct kif_addr))) == NULL) fatal("if_newaddr"); ka->a.addr.v6 = ifa6->sin6_addr; if (mask6) ka->a.prefixlen = mask2prefixlen6(mask6); if (brd6) ka->a.dstbrd.v6 = brd6->sin6_addr; break; default: return; } ka->a.ifindex = ifindex; ka->a.af = ifa->sa_family; TAILQ_INSERT_TAIL(&kif->addrs, ka, entry); /* notify eigrpe about new address */ main_imsg_compose_eigrpe(IMSG_NEWADDR, 0, &ka->a, sizeof(ka->a)); } void if_deladdr(unsigned short ifindex, struct sockaddr *ifa, struct sockaddr *mask, struct sockaddr *brd) { struct kif_node *kif; struct sockaddr_in *ifa4, *mask4, *brd4; struct sockaddr_in6 *ifa6, *mask6, *brd6; struct kaddr k; struct kif_addr *ka, *nka; if (ifa == NULL) return; if ((kif = kif_find(ifindex)) == NULL) { log_warnx("%s: corresponding if %d not found", __func__, ifindex); return; } memset(&k, 0, sizeof(k)); k.af = ifa->sa_family; switch (ifa->sa_family) { case AF_INET: ifa4 = (struct sockaddr_in *) ifa; mask4 = (struct sockaddr_in *) mask; brd4 = (struct sockaddr_in *) brd; /* filter out unwanted addresses */ if (bad_addr_v4(ifa4->sin_addr)) return; k.addr.v4 = ifa4->sin_addr; if (mask4) k.prefixlen = mask2prefixlen(mask4->sin_addr.s_addr); if (brd4) k.dstbrd.v4 = brd4->sin_addr; break; case AF_INET6: ifa6 = (struct sockaddr_in6 *) ifa; mask6 = (struct sockaddr_in6 *) mask; brd6 = (struct sockaddr_in6 *) brd; /* We only care about link-local and global-scope. */ if (bad_addr_v6(&ifa6->sin6_addr)) return; clearscope(&ifa6->sin6_addr); k.addr.v6 = ifa6->sin6_addr; if (mask6) k.prefixlen = mask2prefixlen6(mask6); if (brd6) k.dstbrd.v6 = brd6->sin6_addr; break; default: return; } for (ka = TAILQ_FIRST(&kif->addrs); ka != NULL; ka = nka) { nka = TAILQ_NEXT(ka, entry); if (ka->a.af != k.af || ka->a.prefixlen != k.prefixlen || eigrp_addrcmp(ka->a.af, &ka->a.addr, &k.addr) || eigrp_addrcmp(ka->a.af, &ka->a.dstbrd, &k.dstbrd)) continue; /* notify eigrpe about removed address */ main_imsg_compose_eigrpe(IMSG_DELADDR, 0, &ka->a, sizeof(ka->a)); TAILQ_REMOVE(&kif->addrs, ka, entry); free(ka); return; } } void if_announce(void *msg) { struct if_announcemsghdr *ifan; struct kif_node *kif; ifan = msg; switch (ifan->ifan_what) { case IFAN_ARRIVAL: kif = kif_insert(ifan->ifan_index); if (kif) strlcpy(kif->k.ifname, ifan->ifan_name, sizeof(kif->k.ifname)); break; case IFAN_DEPARTURE: kif = kif_find(ifan->ifan_index); if (kif) kif_remove(kif); break; } } /* rtsock */ static int send_rtmsg_v4(int fd, int action, struct kroute *kr) { struct iovec iov[5]; struct rt_msghdr hdr; struct sockaddr_in prefix; struct sockaddr_in nexthop; struct sockaddr_in mask; int iovcnt = 0; if (kr_state.fib_sync == 0) return (0); /* initialize header */ memset(&hdr, 0, sizeof(hdr)); hdr.rtm_version = RTM_VERSION; hdr.rtm_type = action; hdr.rtm_priority = kr->priority; hdr.rtm_tableid = kr_state.rdomain; /* rtableid */ if (action == RTM_CHANGE) hdr.rtm_fmask = RTF_REJECT|RTF_BLACKHOLE; else hdr.rtm_flags = RTF_MPATH; if (kr->flags & F_BLACKHOLE) hdr.rtm_flags |= RTF_BLACKHOLE; hdr.rtm_seq = kr_state.rtseq++; /* overflow doesn't matter */ hdr.rtm_msglen = sizeof(hdr); /* adjust iovec */ iov[iovcnt].iov_base = &hdr; iov[iovcnt++].iov_len = sizeof(hdr); memset(&prefix, 0, sizeof(prefix)); prefix.sin_len = sizeof(prefix); prefix.sin_family = AF_INET; prefix.sin_addr = kr->prefix.v4; /* adjust header */ hdr.rtm_addrs |= RTA_DST; hdr.rtm_msglen += sizeof(prefix); /* adjust iovec */ iov[iovcnt].iov_base = &prefix; iov[iovcnt++].iov_len = sizeof(prefix); if (kr->nexthop.v4.s_addr != 0) { memset(&nexthop, 0, sizeof(nexthop)); nexthop.sin_len = sizeof(nexthop); nexthop.sin_family = AF_INET; nexthop.sin_addr = kr->nexthop.v4; /* adjust header */ hdr.rtm_flags |= RTF_GATEWAY; hdr.rtm_addrs |= RTA_GATEWAY; hdr.rtm_msglen += sizeof(nexthop); /* adjust iovec */ iov[iovcnt].iov_base = &nexthop; iov[iovcnt++].iov_len = sizeof(nexthop); } memset(&mask, 0, sizeof(mask)); mask.sin_len = sizeof(mask); mask.sin_family = AF_INET; mask.sin_addr.s_addr = prefixlen2mask(kr->prefixlen); /* adjust header */ hdr.rtm_addrs |= RTA_NETMASK; hdr.rtm_msglen += sizeof(mask); /* adjust iovec */ iov[iovcnt].iov_base = &mask; iov[iovcnt++].iov_len = sizeof(mask); retry: if (writev(fd, iov, iovcnt) == -1) { if (errno == ESRCH) { if (hdr.rtm_type == RTM_CHANGE) { hdr.rtm_type = RTM_ADD; goto retry; } else if (hdr.rtm_type == RTM_DELETE) { log_info("route %s/%u vanished before delete", inet_ntoa(kr->prefix.v4), kr->prefixlen); return (0); } } log_warn("%s: action %u, prefix %s/%u", __func__, hdr.rtm_type, inet_ntoa(kr->prefix.v4), kr->prefixlen); return (0); } return (0); } static int send_rtmsg_v6(int fd, int action, struct kroute *kr) { struct iovec iov[5]; struct rt_msghdr hdr; struct pad { struct sockaddr_in6 addr; char pad[sizeof(long)]; /* thank you IPv6 */ } prefix, nexthop, mask; int iovcnt = 0; if (kr_state.fib_sync == 0) return (0); /* initialize header */ memset(&hdr, 0, sizeof(hdr)); hdr.rtm_version = RTM_VERSION; hdr.rtm_type = action; hdr.rtm_priority = kr->priority; hdr.rtm_tableid = kr_state.rdomain; /* rtableid */ if (action == RTM_CHANGE) hdr.rtm_fmask = RTF_REJECT|RTF_BLACKHOLE; else hdr.rtm_flags = RTF_MPATH; hdr.rtm_seq = kr_state.rtseq++; /* overflow doesn't matter */ hdr.rtm_msglen = sizeof(hdr); /* adjust iovec */ iov[iovcnt].iov_base = &hdr; iov[iovcnt++].iov_len = sizeof(hdr); memset(&prefix, 0, sizeof(prefix)); prefix.addr.sin6_len = sizeof(struct sockaddr_in6); prefix.addr.sin6_family = AF_INET6; prefix.addr.sin6_addr = kr->prefix.v6; /* adjust header */ hdr.rtm_addrs |= RTA_DST; hdr.rtm_msglen += ROUNDUP(sizeof(struct sockaddr_in6)); /* adjust iovec */ iov[iovcnt].iov_base = &prefix; iov[iovcnt++].iov_len = ROUNDUP(sizeof(struct sockaddr_in6)); if (!IN6_IS_ADDR_UNSPECIFIED(&kr->nexthop.v6)) { memset(&nexthop, 0, sizeof(nexthop)); nexthop.addr.sin6_len = sizeof(struct sockaddr_in6); nexthop.addr.sin6_family = AF_INET6; nexthop.addr.sin6_addr = kr->nexthop.v6; nexthop.addr.sin6_scope_id = kr->ifindex; embedscope(&nexthop.addr); /* adjust header */ hdr.rtm_flags |= RTF_GATEWAY; hdr.rtm_addrs |= RTA_GATEWAY; hdr.rtm_msglen += ROUNDUP(sizeof(struct sockaddr_in6)); /* adjust iovec */ iov[iovcnt].iov_base = &nexthop; iov[iovcnt++].iov_len = ROUNDUP(sizeof(struct sockaddr_in6)); } memset(&mask, 0, sizeof(mask)); mask.addr.sin6_len = sizeof(struct sockaddr_in6); mask.addr.sin6_family = AF_INET6; mask.addr.sin6_addr = *prefixlen2mask6(kr->prefixlen); /* adjust header */ if (kr->prefixlen == 128) hdr.rtm_flags |= RTF_HOST; hdr.rtm_addrs |= RTA_NETMASK; hdr.rtm_msglen += ROUNDUP(sizeof(struct sockaddr_in6)); /* adjust iovec */ iov[iovcnt].iov_base = &mask; iov[iovcnt++].iov_len = ROUNDUP(sizeof(struct sockaddr_in6)); retry: if (writev(fd, iov, iovcnt) == -1) { if (errno == ESRCH) { if (hdr.rtm_type == RTM_CHANGE) { hdr.rtm_type = RTM_ADD; goto retry; } else if (hdr.rtm_type == RTM_DELETE) { log_info("route %s/%u vanished before delete", log_in6addr(&kr->prefix.v6), kr->prefixlen); return (0); } } log_warn("%s: action %u, prefix %s/%u", __func__, hdr.rtm_type, log_in6addr(&kr->prefix.v6), kr->prefixlen); return (0); } return (0); } int send_rtmsg(int fd, int action, struct kroute *kr) { switch (kr->af) { case AF_INET: return (send_rtmsg_v4(fd, action, kr)); case AF_INET6: return (send_rtmsg_v6(fd, action, kr)); default: break; } return (-1); } int fetchtable(void) { size_t len; int mib[7]; char *buf; int rv; mib[0] = CTL_NET; mib[1] = PF_ROUTE; mib[2] = 0; mib[3] = 0; mib[4] = NET_RT_DUMP; mib[5] = 0; mib[6] = kr_state.rdomain; /* rtableid */ if (sysctl(mib, 7, NULL, &len, NULL, 0) == -1) { log_warn("sysctl"); return (-1); } if ((buf = malloc(len)) == NULL) { log_warn("%s", __func__); return (-1); } if (sysctl(mib, 7, buf, &len, NULL, 0) == -1) { log_warn("sysctl"); free(buf); return (-1); } rv = rtmsg_process(buf, len); free(buf); return (rv); } int fetchifs(void) { size_t len; int mib[6]; char *buf; int rv; mib[0] = CTL_NET; mib[1] = PF_ROUTE; mib[2] = 0; mib[3] = 0; /* wildcard */ mib[4] = NET_RT_IFLIST; mib[5] = 0; if (sysctl(mib, 6, NULL, &len, NULL, 0) == -1) { log_warn("sysctl"); return (-1); } if ((buf = malloc(len)) == NULL) { log_warn("%s", __func__); return (-1); } if (sysctl(mib, 6, buf, &len, NULL, 0) == -1) { log_warn("sysctl"); free(buf); return (-1); } rv = rtmsg_process(buf, len); free(buf); return (rv); } int dispatch_rtmsg(void) { char buf[RT_BUF_SIZE]; ssize_t n; if ((n = read(kr_state.fd, &buf, sizeof(buf))) == -1) { if (errno == EAGAIN || errno == EINTR) return (0); log_warn("%s: read error", __func__); return (-1); } if (n == 0) { log_warnx("routing socket closed"); return (-1); } return (rtmsg_process(buf, n)); } int rtmsg_process(char *buf, size_t len) { struct rt_msghdr *rtm; struct if_msghdr ifm; struct ifa_msghdr *ifam; struct sockaddr *sa, *rti_info[RTAX_MAX]; size_t offset; char *next; for (offset = 0; offset < len; offset += rtm->rtm_msglen) { next = buf + offset; rtm = (struct rt_msghdr *)next; if (len < offset + sizeof(unsigned short) || len < offset + rtm->rtm_msglen) fatalx("rtmsg_process: partial rtm in buffer"); if (rtm->rtm_version != RTM_VERSION) continue; sa = (struct sockaddr *)(next + rtm->rtm_hdrlen); get_rtaddrs(rtm->rtm_addrs, sa, rti_info); switch (rtm->rtm_type) { case RTM_ADD: case RTM_GET: case RTM_CHANGE: case RTM_DELETE: if (rtm->rtm_errno) /* failed attempts... */ continue; if (rtm->rtm_tableid != kr_state.rdomain) continue; if (rtm->rtm_type == RTM_GET && rtm->rtm_pid != kr_state.pid) continue; /* Skip ARP/ND cache and broadcast routes. */ if (rtm->rtm_flags & (RTF_LLINFO|RTF_BROADCAST)) continue; if (rtmsg_process_route(rtm, rti_info) == -1) return (-1); } switch (rtm->rtm_type) { case RTM_IFINFO: memcpy(&ifm, next, sizeof(ifm)); if_change(ifm.ifm_index, ifm.ifm_flags, &ifm.ifm_data, (struct sockaddr_dl *)rti_info[RTAX_IFP]); break; case RTM_NEWADDR: ifam = (struct ifa_msghdr *)rtm; if ((ifam->ifam_addrs & (RTA_NETMASK | RTA_IFA | RTA_BRD)) == 0) break; if_newaddr(ifam->ifam_index, (struct sockaddr *)rti_info[RTAX_IFA], (struct sockaddr *)rti_info[RTAX_NETMASK], (struct sockaddr *)rti_info[RTAX_BRD]); break; case RTM_DELADDR: ifam = (struct ifa_msghdr *)rtm; if ((ifam->ifam_addrs & (RTA_NETMASK | RTA_IFA | RTA_BRD)) == 0) break; if_deladdr(ifam->ifam_index, (struct sockaddr *)rti_info[RTAX_IFA], (struct sockaddr *)rti_info[RTAX_NETMASK], (struct sockaddr *)rti_info[RTAX_BRD]); break; case RTM_IFANNOUNCE: if_announce(next); break; default: /* ignore for now */ break; } } return (offset); } int rtmsg_process_route(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 kr; struct kroute_prefix *kp; struct kroute_priority *kprio; struct kroute_node *kn; if ((sa = rti_info[RTAX_DST]) == NULL) return (-1); memset(&kr, 0, sizeof(kr)); kr.af = sa->sa_family; switch (kr.af) { case AF_INET: kr.prefix.v4 = ((struct sockaddr_in *)sa)->sin_addr; sa_in = (struct sockaddr_in *) rti_info[RTAX_NETMASK]; if (sa_in != NULL && sa_in->sin_len != 0) kr.prefixlen = mask2prefixlen(sa_in->sin_addr.s_addr); else if (rtm->rtm_flags & RTF_HOST) kr.prefixlen = 32; else if (kr.prefix.v4.s_addr == INADDR_ANY) kr.prefixlen = 0; else kr.prefixlen = prefixlen_classful(kr.prefix.v4.s_addr); break; case AF_INET6: kr.prefix.v6 = ((struct sockaddr_in6 *)sa)->sin6_addr; sa_in6 = (struct sockaddr_in6 *)rti_info[RTAX_NETMASK]; if (sa_in6 != NULL && sa_in6->sin6_len != 0) kr.prefixlen = mask2prefixlen6(sa_in6); else if (rtm->rtm_flags & RTF_HOST) kr.prefixlen = 128; else if (IN6_IS_ADDR_UNSPECIFIED(&kr.prefix.v6)) kr.prefixlen = 0; else fatalx("in6 net addr without netmask"); break; default: return (0); } kr.ifindex = rtm->rtm_index; if ((sa = rti_info[RTAX_GATEWAY]) != NULL) { switch (sa->sa_family) { case AF_INET: kr.nexthop.v4 = ((struct sockaddr_in *)sa)->sin_addr; break; case AF_INET6: sa_in6 = (struct sockaddr_in6 *)sa; recoverscope(sa_in6); kr.nexthop.v6 = sa_in6->sin6_addr; if (sa_in6->sin6_scope_id) kr.ifindex = sa_in6->sin6_scope_id; break; case AF_LINK: kr.flags |= F_CONNECTED; break; } } kr.flags |= F_KERNEL; if (rtm->rtm_flags & RTF_STATIC) kr.flags |= F_STATIC; if (rtm->rtm_flags & RTF_BLACKHOLE) kr.flags |= F_BLACKHOLE; if (rtm->rtm_flags & RTF_REJECT) kr.flags |= F_REJECT; if (rtm->rtm_flags & RTF_DYNAMIC) kr.flags |= F_DYNAMIC; if (rtm->rtm_flags & RTF_CONNECTED) kr.flags |= F_CONNECTED; kr.priority = rtm->rtm_priority; if (rtm->rtm_type == RTM_CHANGE) { /* * The kernel doesn't allow RTM_CHANGE for multipath routes. * If we got this message we know that the route has only one * nexthop and we should remove it before installing the same * route with the new nexthop. */ kp = kroute_find_prefix(kr.af, &kr.prefix, kr.prefixlen); if (kp) { kprio = kroute_find_prio(kp, kr.priority); if (kprio) { kn = TAILQ_FIRST(&kprio->nexthops); if (kn) kroute_remove(&kn->r); } } } kn = NULL; kp = kroute_find_prefix(kr.af, &kr.prefix, kr.prefixlen); if (kp) { kprio = kroute_find_prio(kp, kr.priority); if (kprio) kn = kroute_find_gw(kprio, &kr.nexthop); } if (rtm->rtm_type == RTM_DELETE) { if (kn == NULL || !(kn->r.flags & F_KERNEL)) return (0); return (kroute_remove(&kr)); } if (!eigrp_addrisset(kr.af, &kr.nexthop) && !(kr.flags & F_CONNECTED)) { log_warnx("%s: no nexthop for %s/%u", __func__, log_addr(kr.af, &kr.prefix), kr.prefixlen); return (-1); } if (kn != NULL) { /* update route */ kn->r = kr; if (kif_validate(kn->r.ifindex)) kn->r.flags &= ~F_DOWN; else kn->r.flags |= F_DOWN; kr_redistribute(kp); } else { if ((rtm->rtm_type == RTM_ADD || rtm->rtm_type == RTM_GET) && (kr.priority == eigrpd_conf->fib_priority_internal || kr.priority == eigrpd_conf->fib_priority_external || kr.priority == eigrpd_conf->fib_priority_summary)) { log_warnx("alien EIGRP route %s/%d", log_addr(kr.af, &kr.prefix), kr.prefixlen); return (send_rtmsg(kr_state.fd, RTM_DELETE, &kr)); } kroute_insert(&kr); } return (0); }