Edit
IABSD.fr/src/usr.sbin/ospfd/kroute.c
jmatthew
- usr.sbin/ospfd/kroute.c
-
/* $OpenBSD: kroute.c,v 1.114 2020/08/20 03:09:28 jmatthew Exp $ */ /* * Copyright (c) 2004 Esben Norby <norby@openbsd.org> * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org> * * 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 <sys/types.h> #include <sys/socket.h> #include <sys/sysctl.h> #include <sys/tree.h> #include <sys/uio.h> #include <netinet/in.h> #include <arpa/inet.h> #include <net/if.h> #include <net/if_dl.h> #include <net/if_types.h> #include <net/route.h> #include <err.h> #include <errno.h> #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <limits.h> #include "ospfd.h" #include "log.h" struct { u_int32_t rtseq; pid_t pid; int fib_sync; int fib_serial; u_int8_t fib_prio; int fd; struct event ev; struct event reload; u_int rdomain; #define KR_RELOAD_IDLE 0 #define KR_RELOAD_FETCH 1 #define KR_RELOAD_HOLD 2 int reload_state; } kr_state; struct kroute_node { RB_ENTRY(kroute_node) entry; struct kroute_node *next; struct kroute r; int serial; }; struct kif_node { RB_ENTRY(kif_node) entry; TAILQ_HEAD(, kif_addr) addrs; struct kif k; }; void kr_redist_remove(struct kroute_node *, struct kroute_node *); int kr_redist_eval(struct kroute *, struct kroute *); void kr_redistribute(struct kroute_node *); int kroute_compare(struct kroute_node *, struct kroute_node *); int kif_compare(struct kif_node *, struct kif_node *); int kr_change_fib(struct kroute_node *, struct kroute *, int, int); int kr_delete_fib(struct kroute_node *); struct kroute_node *kroute_find(in_addr_t, u_int8_t, u_int8_t); struct kroute_node *kroute_matchgw(struct kroute_node *, struct in_addr); int kroute_insert(struct kroute_node *); int kroute_remove(struct kroute_node *); void kroute_clear(void); struct kif_node *kif_find(u_short); struct kif_node *kif_insert(u_short); int kif_remove(struct kif_node *); struct kif *kif_update(u_short, int, struct if_data *, struct sockaddr_dl *); int kif_validate(u_short); struct kroute_node *kroute_match(in_addr_t); int protect_lo(void); u_int8_t prefixlen_classful(in_addr_t); void get_rtaddrs(int, struct sockaddr *, struct sockaddr **); void if_change(u_short, int, struct if_data *, struct sockaddr_dl *); void if_newaddr(u_short, struct sockaddr_in *, struct sockaddr_in *, struct sockaddr_in *); void if_deladdr(u_short, struct sockaddr_in *, struct sockaddr_in *, struct sockaddr_in *); void if_announce(void *); int send_rtmsg(int, int, struct kroute *); int dispatch_rtmsg(void); int fetchtable(void); int fetchifs(u_short); int rtmsg_process(char *, size_t); void kr_fib_reload_timer(int, short, void *); void kr_fib_reload_arm_timer(int); RB_HEAD(kroute_tree, kroute_node) krt = RB_INITIALIZER(&krt); RB_PROTOTYPE(kroute_tree, kroute_node, entry, kroute_compare) RB_GENERATE(kroute_tree, kroute_node, 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(0) == -1) return (-1); return (0); } int kr_init(int fs, u_int rdomain, int redis_label_or_prefix, u_int8_t fib_prio) { int opt = 0, rcvbuf, default_rcvbuf; socklen_t optlen; int filter_prio = fib_prio; int filter_flags = RTF_LLINFO | RTF_BROADCAST; kr_state.fib_sync = fs; kr_state.rdomain = rdomain; kr_state.fib_prio = fib_prio; if ((kr_state.fd = socket(AF_ROUTE, SOCK_RAW | SOCK_CLOEXEC | SOCK_NONBLOCK, AF_INET)) == -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 */ if (redis_label_or_prefix) { filter_prio = 0; log_info("%s: priority filter disabled", __func__); } else log_debug("%s: priority filter enabled", __func__); if (setsockopt(kr_state.fd, AF_ROUTE, ROUTE_PRIOFILTER, &filter_prio, sizeof(filter_prio)) == -1) { log_warn("%s: setsockopt AF_ROUTE ROUTE_PRIOFILTER", __func__); /* not fatal */ } if (setsockopt(kr_state.fd, AF_ROUTE, ROUTE_FLAGFILTER, &filter_flags, sizeof(filter_flags)) == -1) { log_warn("%s: setsockopt AF_ROUTE ROUTE_FLAGFILTER", __func__); /* 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; if (fetchtable() == -1) return (-1); if (protect_lo() == -1) return (-1); event_set(&kr_state.ev, kr_state.fd, EV_READ | EV_PERSIST, kr_dispatch_msg, NULL); event_add(&kr_state.ev, NULL); kr_state.reload_state = KR_RELOAD_IDLE; evtimer_set(&kr_state.reload, kr_fib_reload_timer, NULL); return (0); } int kr_change_fib(struct kroute_node *kr, struct kroute *kroute, int krcount, int action) { int i; struct kroute_node *kn, *nkn; if (action == RTM_ADD) { /* * First remove all stale multipath routes. * This step must be skipped when the action is RTM_CHANGE * because it is already a single path route that will be * changed. */ for (kn = kr; kn != NULL; kn = nkn) { for (i = 0; i < krcount; i++) { if (kn->r.nexthop.s_addr == kroute[i].nexthop.s_addr) break; } nkn = kn->next; if (i == krcount) { /* stale route */ if (kr_delete_fib(kn) == -1) log_warnx("kr_delete_fib failed"); /* * if head element was removed we need to adjust * the head */ if (kr == kn) kr = nkn; } } } /* * now add or change the route */ for (i = 0; i < krcount; i++) { /* nexthop within 127/8 -> ignore silently */ if ((kroute[i].nexthop.s_addr & htonl(IN_CLASSA_NET)) == htonl(INADDR_LOOPBACK & IN_CLASSA_NET)) continue; if (action == RTM_ADD && kr) { for (kn = kr; kn != NULL; kn = kn->next) { if (kn->r.nexthop.s_addr == kroute[i].nexthop.s_addr) break; } if (kn != NULL) /* nexthop already present, skip it */ continue; } else /* modify first entry */ kn = kr; /* send update */ if (send_rtmsg(kr_state.fd, action, &kroute[i]) == -1) return (-1); /* create new entry unless we are changing the first entry */ if (action == RTM_ADD) if ((kn = calloc(1, sizeof(*kn))) == NULL) fatal(NULL); kn->r.prefix.s_addr = kroute[i].prefix.s_addr; kn->r.prefixlen = kroute[i].prefixlen; kn->r.nexthop.s_addr = kroute[i].nexthop.s_addr; kn->r.flags = kroute[i].flags | F_OSPFD_INSERTED; kn->r.priority = kr_state.fib_prio; kn->r.ext_tag = kroute[i].ext_tag; rtlabel_unref(kn->r.rtlabel); /* for RTM_CHANGE */ kn->r.rtlabel = kroute[i].rtlabel; if (action == RTM_ADD) if (kroute_insert(kn) == -1) { log_debug("kr_update_fib: cannot insert %s", inet_ntoa(kn->r.nexthop)); free(kn); } action = RTM_ADD; } return (0); } int kr_change(struct kroute *kroute, int krcount) { struct kroute_node *kr; int action = RTM_ADD; kroute->rtlabel = rtlabel_tag2id(kroute->ext_tag); kr = kroute_find(kroute->prefix.s_addr, kroute->prefixlen, kr_state.fib_prio); if (kr != NULL && kr->next == NULL && krcount == 1) /* single path OSPF route */ action = RTM_CHANGE; return (kr_change_fib(kr, kroute, krcount, action)); } int kr_delete_fib(struct kroute_node *kr) { if (kr->r.priority != kr_state.fib_prio) log_warn("kr_delete_fib: %s/%d has wrong priority %d", inet_ntoa(kr->r.prefix), kr->r.prefixlen, kr->r.priority); if (send_rtmsg(kr_state.fd, RTM_DELETE, &kr->r) == -1) return (-1); if (kroute_remove(kr) == -1) return (-1); return (0); } int kr_delete(struct kroute *kroute) { struct kroute_node *kr, *nkr; if ((kr = kroute_find(kroute->prefix.s_addr, kroute->prefixlen, kr_state.fib_prio)) == NULL) return (0); while (kr != NULL) { nkr = kr->next; if (kr_delete_fib(kr) == -1) return (-1); kr = nkr; } return (0); } void kr_shutdown(void) { kr_fib_decouple(); kroute_clear(); kif_clear(); } void kr_fib_couple(void) { struct kroute_node *kr; struct kroute_node *kn; if (kr_state.fib_sync == 1) /* already coupled */ return; kr_state.fib_sync = 1; RB_FOREACH(kr, kroute_tree, &krt) if (kr->r.priority == kr_state.fib_prio) for (kn = kr; kn != NULL; kn = kn->next) send_rtmsg(kr_state.fd, RTM_ADD, &kn->r); log_info("kernel routing table coupled"); } void kr_fib_decouple(void) { struct kroute_node *kr; struct kroute_node *kn; if (kr_state.fib_sync == 0) /* already decoupled */ return; RB_FOREACH(kr, kroute_tree, &krt) if (kr->r.priority == kr_state.fib_prio) for (kn = kr; kn != NULL; kn = kn->next) send_rtmsg(kr_state.fd, RTM_DELETE, &kn->r); kr_state.fib_sync = 0; log_info("kernel routing table decoupled"); } void kr_fib_reload_timer(int fd, short event, void *bula) { if (kr_state.reload_state == KR_RELOAD_FETCH) { kr_fib_reload(); kr_state.reload_state = KR_RELOAD_HOLD; kr_fib_reload_arm_timer(KR_RELOAD_HOLD_TIMER); } else { kr_state.reload_state = KR_RELOAD_IDLE; } } void kr_fib_reload_arm_timer(int delay) { struct timeval tv; timerclear(&tv); tv.tv_sec = delay / 1000; tv.tv_usec = (delay % 1000) * 1000; if (evtimer_add(&kr_state.reload, &tv) == -1) fatal("add_reload_timer"); } void kr_fib_reload() { struct kroute_node *krn, *kr, *kn; log_info("reloading interface list and routing table"); kr_state.fib_serial++; if (fetchifs(0) == -1 || fetchtable() == -1) return; for (kr = RB_MIN(kroute_tree, &krt); kr != NULL; kr = krn) { krn = RB_NEXT(kroute_tree, &krt, kr); do { kn = kr->next; if (kr->serial != kr_state.fib_serial) { if (kr->r.priority == kr_state.fib_prio) { kr->serial = kr_state.fib_serial; if (send_rtmsg(kr_state.fd, RTM_ADD, &kr->r) != 0) break; } else kroute_remove(kr); } } while ((kr = kn) != NULL); } } void kr_fib_update_prio(u_int8_t fib_prio) { struct kroute_node *kr; RB_FOREACH(kr, kroute_tree, &krt) if ((kr->r.flags & F_OSPFD_INSERTED)) kr->r.priority = fib_prio; log_info("fib priority changed from %hhu to %hhu", kr_state.fib_prio, fib_prio); kr_state.fib_prio = fib_prio; } /* ARGSUSED */ void kr_dispatch_msg(int fd, short event, void *bula) { /* XXX this is stupid */ if (dispatch_rtmsg() == -1) event_loopexit(NULL); } void kr_show_route(struct imsg *imsg) { struct kroute_node *kr; struct kroute_node *kn; int flags; struct in_addr addr; switch (imsg->hdr.type) { case IMSG_CTL_KROUTE: if (imsg->hdr.len != IMSG_HEADER_SIZE + sizeof(flags)) { log_warnx("kr_show_route: wrong imsg len"); return; } memcpy(&flags, imsg->data, sizeof(flags)); RB_FOREACH(kr, kroute_tree, &krt) if (!flags || kr->r.flags & flags) { kn = kr; do { main_imsg_compose_ospfe(IMSG_CTL_KROUTE, imsg->hdr.pid, &kn->r, sizeof(kn->r)); } while ((kn = kn->next) != NULL); } break; case IMSG_CTL_KROUTE_ADDR: if (imsg->hdr.len != IMSG_HEADER_SIZE + sizeof(struct in_addr)) { log_warnx("kr_show_route: wrong imsg len"); return; } memcpy(&addr, imsg->data, sizeof(addr)); kr = NULL; kr = kroute_match(addr.s_addr); if (kr != NULL) main_imsg_compose_ospfe(IMSG_CTL_KROUTE, imsg->hdr.pid, &kr->r, sizeof(kr->r)); break; default: log_debug("kr_show_route: error handling imsg"); break; } main_imsg_compose_ospfe(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_ospfe(IMSG_CTL_IFINFO, pid, &kif->k, sizeof(kif->k)); } main_imsg_compose_ospfe(IMSG_CTL_END, pid, NULL, 0); } void kr_redist_remove(struct kroute_node *kh, struct kroute_node *kn) { struct kroute *kr; /* was the route redistributed? */ if ((kn->r.flags & F_REDISTRIBUTED) == 0) return; /* remove redistributed flag */ kn->r.flags &= ~F_REDISTRIBUTED; kr = &kn->r; /* probably inform the RDE (check if no other path is redistributed) */ for (kn = kh; kn; kn = kn->next) if (kn->r.flags & F_REDISTRIBUTED) break; if (kn == NULL) main_imsg_compose_rde(IMSG_NETWORK_DEL, 0, kr, sizeof(struct kroute)); } int kr_redist_eval(struct kroute *kr, struct kroute *new_kr) { u_int32_t a, metric = 0; /* Only non-ospfd 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; /* interface is not up and running so don't announce */ if (kr->flags & F_DOWN) goto dont_redistribute; /* * 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) goto dont_redistribute; /* * Consider networks with nexthop loopback as not redistributable * unless it is a reject or blackhole route. */ if (kr->nexthop.s_addr == htonl(INADDR_LOOPBACK) && !(kr->flags & (F_BLACKHOLE|F_REJECT))) goto dont_redistribute; /* Should we redistribute this route? */ if (!ospf_redistribute(kr, &metric)) goto dont_redistribute; /* prefix should be redistributed */ kr->flags |= F_REDISTRIBUTED; /* * only one of all multipath routes can be redistributed so * redistribute the best one. */ if (new_kr->metric > metric) { *new_kr = *kr; new_kr->metric = metric; } return (1); dont_redistribute: /* was the route redistributed? */ if ((kr->flags & F_REDISTRIBUTED) == 0) return (0); kr->flags &= ~F_REDISTRIBUTED; return (1); } void kr_redistribute(struct kroute_node *kh) { struct kroute_node *kn; struct kroute kr; int redistribute = 0; /* only the highest prio route can be redistributed */ if (kroute_find(kh->r.prefix.s_addr, kh->r.prefixlen, RTP_ANY) != kh) return; bzero(&kr, sizeof(kr)); kr.metric = UINT_MAX; for (kn = kh; kn; kn = kn->next) if (kr_redist_eval(&kn->r, &kr)) redistribute = 1; if (!redistribute) return; if (kr.flags & F_REDISTRIBUTED) { main_imsg_compose_rde(IMSG_NETWORK_ADD, 0, &kr, sizeof(struct kroute)); } else { kr = kh->r; main_imsg_compose_rde(IMSG_NETWORK_DEL, 0, &kr, sizeof(struct kroute)); } } void kr_reload(int redis_label_or_prefix) { struct kroute_node *kr, *kn; u_int32_t dummy; int r; int filter_prio = kr_state.fib_prio; /* update the priority filter */ if (redis_label_or_prefix) { filter_prio = 0; log_info("%s: priority filter disabled", __func__); } else log_debug("%s: priority filter enabled", __func__); if (setsockopt(kr_state.fd, AF_ROUTE, ROUTE_PRIOFILTER, &filter_prio, sizeof(filter_prio)) == -1) { log_warn("%s: setsockopt AF_ROUTE ROUTE_PRIOFILTER", __func__); /* not fatal */ } /* update redistribute lists */ RB_FOREACH(kr, kroute_tree, &krt) { for (kn = kr; kn; kn = kn->next) { r = ospf_redistribute(&kn->r, &dummy); /* * if it is redistributed, redistribute again metric * may have changed. */ if ((kn->r.flags & F_REDISTRIBUTED && !r) || r) break; } if (kn) { /* * kr_redistribute copes with removes and RDE with * duplicates */ kr_redistribute(kr); } } } /* rb-tree compare */ 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); /* if the priority is RTP_ANY finish on the first address hit */ if (a->r.priority == RTP_ANY || b->r.priority == RTP_ANY) return (0); if (a->r.priority < b->r.priority) return (-1); if (a->r.priority > b->r.priority) return (1); return (0); } int kif_compare(struct kif_node *a, struct kif_node *b) { return (b->k.ifindex - a->k.ifindex); } /* tree management */ struct kroute_node * kroute_find(in_addr_t prefix, u_int8_t prefixlen, u_int8_t prio) { struct kroute_node s; struct kroute_node *kn, *tmp; s.r.prefix.s_addr = prefix; s.r.prefixlen = prefixlen; s.r.priority = prio; kn = RB_FIND(kroute_tree, &krt, &s); if (kn && prio == RTP_ANY) { tmp = RB_PREV(kroute_tree, &krt, kn); while (tmp) { if (kroute_compare(&s, tmp) == 0) kn = tmp; else break; tmp = RB_PREV(kroute_tree, &krt, kn); } } return (kn); } struct kroute_node * kroute_matchgw(struct kroute_node *kr, struct in_addr nh) { in_addr_t nexthop; nexthop = nh.s_addr; while (kr) { if (kr->r.nexthop.s_addr == nexthop) return (kr); kr = kr->next; } return (NULL); } int kroute_insert(struct kroute_node *kr) { struct kroute_node *krm, *krh; kr->serial = kr_state.fib_serial; if ((krh = RB_INSERT(kroute_tree, &krt, kr)) != NULL) { /* * Multipath route, add at end of list. */ krm = krh; while (krm->next != NULL) krm = krm->next; krm->next = kr; kr->next = NULL; /* to be sure */ } else krh = kr; if (!(kr->r.flags & F_KERNEL)) { /* don't validate or redistribute ospf route */ kr->r.flags &= ~F_DOWN; return (0); } if (kif_validate(kr->r.ifindex)) kr->r.flags &= ~F_DOWN; else kr->r.flags |= F_DOWN; kr_redistribute(krh); return (0); } int kroute_remove(struct kroute_node *kr) { struct kroute_node *krm; if ((krm = RB_FIND(kroute_tree, &krt, kr)) == NULL) { log_warnx("kroute_remove failed to find %s/%u", inet_ntoa(kr->r.prefix), kr->r.prefixlen); return (-1); } if (krm == kr) { /* head element */ 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); } if (kr->next != NULL) { if (RB_INSERT(kroute_tree, &krt, kr->next) != NULL) { log_warnx("kroute_remove failed to add %s/%u", inet_ntoa(kr->r.prefix), kr->r.prefixlen); return (-1); } } } else { /* somewhere in the list */ while (krm->next != kr && krm->next != NULL) krm = krm->next; if (krm->next == NULL) { log_warnx("kroute_remove multipath list corrupted " "for %s/%u", inet_ntoa(kr->r.prefix), kr->r.prefixlen); return (-1); } krm->next = kr->next; } kr_redist_remove(krm, kr); rtlabel_unref(kr->r.rtlabel); free(kr); return (0); } void kroute_clear(void) { struct kroute_node *kr; while ((kr = RB_MIN(kroute_tree, &krt)) != NULL) kroute_remove(kr); } struct kif_node * kif_find(u_short ifindex) { struct kif_node s; bzero(&s, sizeof(s)); s.k.ifindex = ifindex; return (RB_FIND(kif_tree, &kit, &s)); } struct kif * kif_findname(char *ifname, struct in_addr addr, struct kif_addr **kap) { struct kif_node *kif; struct kif_addr *ka; RB_FOREACH(kif, kif_tree, &kit) if (!strcmp(ifname, kif->k.ifname)) { ka = TAILQ_FIRST(&kif->addrs); if (addr.s_addr != 0) { TAILQ_FOREACH(ka, &kif->addrs, entry) { if (addr.s_addr == ka->addr.s_addr) break; } } if (kap != NULL) *kap = ka; return (&kif->k); } return (NULL); } struct kif_node * kif_insert(u_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("RB_REMOVE(kif_tree, &kit, kif)"); 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(u_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; kif->k.rdomain = ifd->ifi_rdomain; 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(u_short ifindex) { struct kif_node *kif; if ((kif = kif_find(ifindex)) == NULL) { log_warnx("interface with index %u not found", ifindex); return (1); } return (kif->k.nh_reachable); } struct kroute_node * kroute_match(in_addr_t key) { int i; struct kroute_node *kr; /* we will never match the default route */ for (i = 32; i > 0; i--) if ((kr = kroute_find(key & prefixlen2mask(i), i, RTP_ANY)) != NULL) return (kr); /* if we don't have a match yet, try to find a default route */ if ((kr = kroute_find(0, 0, RTP_ANY)) != NULL) return (kr); return (NULL); } /* misc */ int protect_lo(void) { struct kroute_node *kr; /* 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 & IN_CLASSA_NET); 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 */ 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))); } in_addr_t prefixlen2mask(u_int8_t prefixlen) { if (prefixlen == 0) return (0); return (htonl(0xffffffff << (32 - prefixlen))); } #define ROUNDUP(a) \ ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 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(u_short ifindex, int flags, struct if_data *ifd, struct sockaddr_dl *sdl) { struct kroute_node *kr, *tkr; struct kif *kif; u_int8_t reachable; if ((kif = kif_update(ifindex, flags, ifd, sdl)) == NULL) { log_warn("if_change: kif_update(%u)", ifindex); return; } /* notify ospfe about interface link state */ main_imsg_compose_ospfe(IMSG_IFINFO, 0, kif, sizeof(struct kif)); 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; /* update redistribute list */ RB_FOREACH(kr, kroute_tree, &krt) { for (tkr = kr; tkr != NULL; tkr = tkr->next) { if (tkr->r.ifindex == ifindex) { if (reachable) tkr->r.flags &= ~F_DOWN; else tkr->r.flags |= F_DOWN; } } kr_redistribute(kr); } } void if_newaddr(u_short ifindex, struct sockaddr_in *ifa, struct sockaddr_in *mask, struct sockaddr_in *brd) { struct kif_node *kif; struct kif_addr *ka; struct ifaddrchange ifn; if (ifa == NULL || ifa->sin_family != AF_INET) return; if ((kif = kif_find(ifindex)) == NULL) { log_warnx("if_newaddr: corresponding if %d not found", ifindex); return; } if ((ka = calloc(1, sizeof(struct kif_addr))) == NULL) fatal("if_newaddr"); ka->addr = ifa->sin_addr; if (mask) ka->mask = mask->sin_addr; else ka->mask.s_addr = INADDR_NONE; if (brd) ka->dstbrd = brd->sin_addr; else ka->dstbrd.s_addr = INADDR_NONE; TAILQ_INSERT_TAIL(&kif->addrs, ka, entry); ifn.addr = ka->addr; ifn.mask = ka->mask; ifn.dst = ka->dstbrd; ifn.ifindex = ifindex; main_imsg_compose_ospfe(IMSG_IFADDRADD, 0, &ifn, sizeof(ifn)); } void if_deladdr(u_short ifindex, struct sockaddr_in *ifa, struct sockaddr_in *mask, struct sockaddr_in *brd) { struct kif_node *kif; struct kif_addr *ka, *nka; struct ifaddrchange ifc; if (ifa == NULL || ifa->sin_family != AF_INET) return; if ((kif = kif_find(ifindex)) == NULL) { log_warnx("if_deladdr: corresponding if %d not found", ifindex); return; } for (ka = TAILQ_FIRST(&kif->addrs); ka != NULL; ka = nka) { nka = TAILQ_NEXT(ka, entry); if (ka->addr.s_addr == ifa->sin_addr.s_addr) { TAILQ_REMOVE(&kif->addrs, ka, entry); ifc.addr = ifa->sin_addr; ifc.ifindex = ifindex; main_imsg_compose_ospfe(IMSG_IFADDRDEL, 0, &ifc, sizeof(ifc)); 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); strlcpy(kif->k.ifname, ifan->ifan_name, sizeof(kif->k.ifname)); break; case IFAN_DEPARTURE: kif = kif_find(ifan->ifan_index); kif_remove(kif); break; } } /* rtsock */ int send_rtmsg(int fd, int action, struct kroute *kroute) { struct iovec iov[5]; struct rt_msghdr hdr; struct sockaddr_in prefix; struct sockaddr_in nexthop; struct sockaddr_in mask; struct sockaddr_rtlabel sa_rl; int iovcnt = 0; const char *label; if (kr_state.fib_sync == 0) return (0); /* initialize header */ bzero(&hdr, sizeof(hdr)); hdr.rtm_version = RTM_VERSION; hdr.rtm_type = action; hdr.rtm_priority = kr_state.fib_prio; 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); bzero(&prefix, sizeof(prefix)); prefix.sin_len = sizeof(prefix); prefix.sin_family = AF_INET; prefix.sin_addr.s_addr = kroute->prefix.s_addr; /* 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 (kroute->nexthop.s_addr != 0) { bzero(&nexthop, sizeof(nexthop)); nexthop.sin_len = sizeof(nexthop); nexthop.sin_family = AF_INET; nexthop.sin_addr.s_addr = kroute->nexthop.s_addr; /* 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); } bzero(&mask, sizeof(mask)); mask.sin_len = sizeof(mask); mask.sin_family = AF_INET; mask.sin_addr.s_addr = prefixlen2mask(kroute->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); if (kroute->rtlabel != 0) { sa_rl.sr_len = sizeof(sa_rl); sa_rl.sr_family = AF_UNSPEC; label = rtlabel_id2name(kroute->rtlabel); if (strlcpy(sa_rl.sr_label, label, sizeof(sa_rl.sr_label)) >= sizeof(sa_rl.sr_label)) { log_warnx("send_rtmsg: invalid rtlabel"); return (-1); } /* adjust header */ hdr.rtm_addrs |= RTA_LABEL; hdr.rtm_msglen += sizeof(sa_rl); /* adjust iovec */ iov[iovcnt].iov_base = &sa_rl; iov[iovcnt++].iov_len = sizeof(sa_rl); } 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(kroute->prefix), kroute->prefixlen); return (0); } } log_warn("send_rtmsg: action %u, prefix %s/%u", hdr.rtm_type, inet_ntoa(kroute->prefix), kroute->prefixlen); return (0); } return (0); } 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] = AF_INET; 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("fetchtable"); 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(u_short ifindex) { size_t len; int mib[6]; char *buf; int rv; mib[0] = CTL_NET; mib[1] = PF_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); } 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("dispatch_rtmsg: read error"); 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]; struct sockaddr_in *sa_in; struct sockaddr_rtlabel *label; struct kroute_node *kr, *okr; struct in_addr prefix, nexthop; u_int8_t prefixlen, prio; int flags, mpath; u_short ifindex = 0; int rv, delay; 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(u_short) || len < offset + rtm->rtm_msglen) fatalx("%s: partial rtm in buffer", __func__); if (rtm->rtm_version != RTM_VERSION) continue; prefix.s_addr = 0; prefixlen = 0; nexthop.s_addr = 0; mpath = 0; prio = 0; flags = F_KERNEL; 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; if ((sa = rti_info[RTAX_DST]) == NULL) continue; /* Skip ARP/ND cache and broadcast routes. */ if (rtm->rtm_flags & (RTF_LLINFO|RTF_BROADCAST)) continue; if (rtm->rtm_flags & RTF_MPATH) mpath = 1; prio = rtm->rtm_priority; flags = (prio == kr_state.fib_prio) ? F_OSPFD_INSERTED : F_KERNEL; switch (sa->sa_family) { case AF_INET: prefix.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.s_addr); 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; break; default: continue; } ifindex = rtm->rtm_index; if ((sa = rti_info[RTAX_GATEWAY]) != NULL) { switch (sa->sa_family) { case AF_INET: if (rtm->rtm_flags & RTF_CONNECTED) flags |= F_CONNECTED; nexthop.s_addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr; break; case AF_LINK: /* * Traditional BSD connected routes have * a gateway of type AF_LINK. */ flags |= F_CONNECTED; break; } } } switch (rtm->rtm_type) { case RTM_ADD: case RTM_GET: case RTM_CHANGE: if (nexthop.s_addr == 0 && !(flags & F_CONNECTED)) { log_warnx("no nexthop for %s/%u", inet_ntoa(prefix), prefixlen); continue; } if ((okr = kroute_find(prefix.s_addr, prefixlen, prio)) != NULL) { /* get the correct route */ kr = okr; if ((mpath || prio == kr_state.fib_prio) && (kr = kroute_matchgw(okr, nexthop)) == NULL) { log_warnx("%s: mpath route not found", __func__); /* add routes we missed out earlier */ goto add; } if (kr->r.flags & F_REDISTRIBUTED) flags |= F_REDISTRIBUTED; kr->r.nexthop.s_addr = nexthop.s_addr; kr->r.flags = flags; kr->r.ifindex = ifindex; rtlabel_unref(kr->r.rtlabel); kr->r.rtlabel = 0; kr->r.ext_tag = 0; if ((label = (struct sockaddr_rtlabel *) rti_info[RTAX_LABEL]) != NULL) { kr->r.rtlabel = rtlabel_name2id(label->sr_label); kr->r.ext_tag = rtlabel_id2tag(kr->r.rtlabel); } if (kif_validate(kr->r.ifindex)) kr->r.flags &= ~F_DOWN; else kr->r.flags |= F_DOWN; /* just readd, the RDE will care */ kr->serial = kr_state.fib_serial; kr_redistribute(okr); } else { add: if ((kr = calloc(1, sizeof(struct kroute_node))) == NULL) { log_warn("%s: calloc", __func__); return (-1); } kr->r.prefix.s_addr = prefix.s_addr; kr->r.prefixlen = prefixlen; kr->r.nexthop.s_addr = nexthop.s_addr; kr->r.flags = flags; kr->r.ifindex = ifindex; kr->r.priority = prio; if (rtm->rtm_priority == kr_state.fib_prio) { log_warnx("alien OSPF route %s/%d", inet_ntoa(prefix), prefixlen); rv = send_rtmsg(kr_state.fd, RTM_DELETE, &kr->r); free(kr); if (rv == -1) return (-1); } else { if ((label = (struct sockaddr_rtlabel *) rti_info[RTAX_LABEL]) != NULL) { kr->r.rtlabel = rtlabel_name2id( label->sr_label); kr->r.ext_tag = rtlabel_id2tag( kr->r.rtlabel); } kroute_insert(kr); } } break; case RTM_DELETE: if ((kr = kroute_find(prefix.s_addr, prefixlen, prio)) == NULL) continue; if (!(kr->r.flags & F_KERNEL)) continue; /* get the correct route */ okr = kr; if (mpath && (kr = kroute_matchgw(kr, nexthop)) == NULL) { log_warnx("%s: mpath route not found", __func__); return (-1); } if (kroute_remove(kr) == -1) return (-1); break; 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_in *)rti_info[RTAX_IFA], (struct sockaddr_in *)rti_info[RTAX_NETMASK], (struct sockaddr_in *)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_in *)rti_info[RTAX_IFA], (struct sockaddr_in *)rti_info[RTAX_NETMASK], (struct sockaddr_in *)rti_info[RTAX_BRD]); break; case RTM_IFANNOUNCE: if_announce(next); break; case RTM_DESYNC: /* * We lost some routing packets. Schedule a reload * of the kernel route/interface information. */ if (kr_state.reload_state == KR_RELOAD_IDLE) { delay = KR_RELOAD_TIMER; log_info("desync; scheduling fib reload"); } else { delay = KR_RELOAD_HOLD_TIMER; log_debug("desync during KR_RELOAD_%s", kr_state.reload_state == KR_RELOAD_FETCH ? "FETCH" : "HOLD"); } kr_state.reload_state = KR_RELOAD_FETCH; kr_fib_reload_arm_timer(delay); break; default: /* ignore for now */ break; } } return (offset); }