/* $OpenBSD: kroute.c,v 1.10 2009/02/03 14:06:18 stsp Exp $ */ /* * 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 #include "ospf6d.h" #include "ospfe.h" #include "log.h" struct { u_int32_t rtseq; pid_t pid; int fib_sync; int fd; struct event ev; } kr_state; struct kroute_node { RB_ENTRY(kroute_node) entry; struct kroute r; struct kroute_node *next; }; void kr_redist_remove(struct kroute_node *, struct kroute_node *); int kr_redist_eval(struct kroute *, struct rroute *); void kr_redistribute(struct kroute_node *); int kroute_compare(struct kroute_node *, struct kroute_node *); struct kroute_node *kroute_find(const struct in6_addr *, u_int8_t); struct kroute_node *kroute_matchgw(struct kroute_node *, struct in6_addr *); int kroute_insert(struct kroute_node *); int kroute_remove(struct kroute_node *); void kroute_clear(void); struct iface *kif_update(u_short, int, struct if_data *, struct sockaddr_dl *); int kif_validate(u_short); struct kroute_node *kroute_match(struct in6_addr *); int protect_lo(void); void get_rtaddrs(int, struct sockaddr *, struct sockaddr **); void if_change(u_short, int, struct if_data *); void if_newaddr(u_short, struct sockaddr_in6 *, struct sockaddr_in6 *, struct sockaddr_in6 *); void if_announce(void *); int send_rtmsg(int, int, struct kroute *); int dispatch_rtmsg(void); int fetchtable(void); 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) 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); 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); return (0); } int kr_change(struct kroute *kroute) { struct kroute_node *kr; int action = RTM_ADD; kroute->rtlabel = rtlabel_tag2id(kroute->ext_tag); if ((kr = kroute_find(&kroute->prefix, kroute->prefixlen)) != NULL) { if (!(kr->r.flags & F_KERNEL)) action = RTM_CHANGE; else { /* a non-ospf route already exists. not a problem */ if (!(kr->r.flags & F_BGPD_INSERTED)) { do { kr->r.flags |= F_OSPFD_INSERTED; kr = kr->next; } while (kr); return (0); } /* * XXX as long as there is no multipath support in * bgpd this is safe else we end up in a bad situation. */ /* * ospf route has higher pref * - reset flags to the ospf ones * - use RTM_CHANGE * - zero out ifindex (this is no longer relevant) */ action = RTM_CHANGE; kr->r.flags = kroute->flags | F_OSPFD_INSERTED; kr->r.ifindex = 0; rtlabel_unref(kr->r.rtlabel); kr->r.ext_tag = kroute->ext_tag; kr->r.rtlabel = kroute->rtlabel; } } /* nexthop within 127/8 -> ignore silently */ if (IN6_IS_ADDR_LOOPBACK(&kr->r.nexthop)) return (0); /* * Ingnore updates that did not change the route. * Currently only the nexthop can change. */ if (kr && IN6_ARE_ADDR_EQUAL(&kr->r.nexthop, &kroute->nexthop)) return (0); if (send_rtmsg(kr_state.fd, action, kroute) == -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 = kroute->prefix; kr->r.prefixlen = kroute->prefixlen; kr->r.nexthop = kroute->nexthop; kr->r.flags = kroute->flags | F_OSPFD_INSERTED; kr->r.ext_tag = kroute->ext_tag; kr->r.rtlabel = kroute->rtlabel; if (kroute_insert(kr) == -1) free(kr); } else kr->r.nexthop = kroute->nexthop; return (0); } int kr_delete(struct kroute *kroute) { struct kroute_node *kr; if ((kr = kroute_find(&kroute->prefix, kroute->prefixlen)) == NULL) return (0); if (!(kr->r.flags & F_OSPFD_INSERTED)) return (0); if (kr->r.flags & F_KERNEL) { /* remove F_OSPFD_INSERTED flag, route still exists in kernel */ do { kr->r.flags &= ~F_OSPFD_INSERTED; kr = kr->next; } while (kr); return (0); } if (send_rtmsg(kr_state.fd, RTM_DELETE, kroute) == -1) return (-1); if (kroute_remove(kr) == -1) return (-1); return (0); } void kr_shutdown(void) { kr_fib_decouple(); kroute_clear(); } void kr_fib_couple(void) { struct kroute_node *kr; 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_KERNEL)) send_rtmsg(kr_state.fd, RTM_ADD, &kr->r); log_info("kernel routing table coupled"); } void kr_fib_decouple(void) { struct kroute_node *kr; if (kr_state.fib_sync == 0) /* already decoupled */ return; RB_FOREACH(kr, kroute_tree, &krt) if (!(kr->r.flags & F_KERNEL)) send_rtmsg(kr_state.fd, RTM_DELETE, &kr->r); kr_state.fib_sync = 0; log_info("kernel routing table decoupled"); } /* ARGSUSED */ void kr_dispatch_msg(int fd, short event, void *bula) { dispatch_rtmsg(); } void kr_show_route(struct imsg *imsg) { struct kroute_node *kr; struct kroute_node *kn; int flags; struct in6_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 in6_addr)) { log_warnx("kr_show_route: wrong imsg len"); return; } memcpy(&addr, imsg->data, sizeof(addr)); kr = NULL; kr = kroute_match(&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_redist_remove(struct kroute_node *kh, struct kroute_node *kn) { struct rroute rr; /* was the route redistributed? */ if ((kn->r.flags & F_REDISTRIBUTED) == 0) return; /* remove redistributed flag */ kn->r.flags &= ~F_REDISTRIBUTED; rr.kr = kn->r; rr.metric = DEFAULT_REDIST_METRIC; /* some dummy value */ /* 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, &rr, sizeof(struct rroute)); } int kr_redist_eval(struct kroute *kr, struct rroute *rr) { u_int32_t 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 unspecified, loopback, multicast, link- and site-local, * IPv4 mapped and IPv4 compatible addresses as not redistributable. */ if (IN6_IS_ADDR_UNSPECIFIED(&kr->prefix) || IN6_IS_ADDR_LOOPBACK(&kr->prefix) || IN6_IS_ADDR_MULTICAST(&kr->prefix) || IN6_IS_ADDR_LINKLOCAL(&kr->prefix) || IN6_IS_ADDR_SITELOCAL(&kr->prefix) || IN6_IS_ADDR_V4MAPPED(&kr->prefix) || IN6_IS_ADDR_V4COMPAT(&kr->prefix)) goto dont_redistribute; /* * Consider networks with nexthop loopback as not redistributable. */ if (IN6_IS_ADDR_LOOPBACK(&kr->nexthop)) goto dont_redistribute; /* Should we redistrubute this route? */ if (!ospf_redistribute(kr, &metric)) goto dont_redistribute; /* prefix should be redistributed */ kr->flags |= F_REDISTRIBUTED; /* * only on of all multipath routes can be redistributed so * redistribute the best one. */ if (rr->metric > metric) { rr->kr = *kr; rr->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 rroute rr; int redistribute = 0; bzero(&rr, sizeof(rr)); rr.metric = UINT_MAX; for (kn = kh; kn; kn = kn->next) if (kr_redist_eval(&kn->r, &rr)) redistribute = 1; if (!redistribute) return; if (rr.kr.flags & F_REDISTRIBUTED) { main_imsg_compose_rde(IMSG_NETWORK_ADD, 0, &rr, sizeof(struct rroute)); } else { rr.metric = DEFAULT_REDIST_METRIC; /* some dummy value */ rr.kr = kh->r; main_imsg_compose_rde(IMSG_NETWORK_DEL, 0, &rr, sizeof(struct rroute)); } } void kr_reload(void) { struct kroute_node *kr, *kn; u_int32_t dummy; int r; 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) { int i; /* XXX maybe switch a & b */ i = memcmp(&a->r.prefix, &b->r.prefix, sizeof(a->r.prefix)); if (i) return (i); if (a->r.prefixlen < b->r.prefixlen) return (-1); if (a->r.prefixlen > b->r.prefixlen) return (1); return (0); } /* tree management */ struct kroute_node * kroute_find(const struct in6_addr *prefix, u_int8_t prefixlen) { struct kroute_node s; s.r.prefix = *prefix; s.r.prefixlen = prefixlen; return (RB_FIND(kroute_tree, &krt, &s)); } struct kroute_node * kroute_matchgw(struct kroute_node *kr, struct in6_addr *nh) { while (kr) { if (IN6_ARE_ADDR_EQUAL(&kr->r.nexthop, nh)) return (kr); kr = kr->next; } return (NULL); } int kroute_insert(struct kroute_node *kr) { struct kroute_node *krm; if ((krm = RB_INSERT(kroute_tree, &krt, kr)) != NULL) { /* * Multipath route, add at end of list and clone the * ospfd inserted flag. */ kr->r.flags |= krm->r.flags & F_OSPFD_INSERTED; while (krm->next != NULL) krm = krm->next; krm->next = kr; kr->next = NULL; /* to be sure */ } else krm = 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(krm); 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", log_in6addr(&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", log_in6addr(&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", log_in6addr(&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", log_in6addr(&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 iface * kif_update(u_short ifindex, int flags, struct if_data *ifd, struct sockaddr_dl *sdl) { struct iface *iface; char ifname[IF_NAMESIZE]; if ((iface = if_find(ifindex)) == NULL) { if (sdl && sdl->sdl_family == AF_LINK) { bzero(ifname, sizeof(ifname)); if (sdl->sdl_nlen >= sizeof(ifname)) memcpy(ifname, sdl->sdl_data, sizeof(ifname) - 1); else if (sdl->sdl_nlen > 0) memcpy(ifname, sdl->sdl_data, sdl->sdl_nlen); } if ((iface = if_new(ifindex, ifname)) == NULL) return (NULL); iface->cflags |= F_IFACE_AVAIL; } if_update(iface, ifd->ifi_mtu, flags, ifd->ifi_type, ifd->ifi_link_state, ifd->ifi_baudrate); return (iface); } int kif_validate(u_short ifindex) { struct iface *iface; if ((iface = if_find(ifindex)) == NULL) { log_warnx("interface with index %u not found", ifindex); return (1); } return (iface->nh_reachable); } struct kroute_node * kroute_match(struct in6_addr *key) { int i; struct kroute_node *kr; struct in6_addr ina; /* we will never match the default route */ for (i = 128; i > 0; i--) { inet6applymask(&ina, key, i); if ((kr = kroute_find(&ina, i)) != NULL) return (kr); } /* if we don't have a match yet, try to find a default route */ if ((kr = kroute_find(&in6addr_any, 0)) != NULL) return (kr); return (NULL); } /* misc */ int protect_lo(void) { struct kroute_node *kr; /* special protection for loopback */ if ((kr = calloc(1, sizeof(struct kroute_node))) == NULL) { log_warn("protect_lo"); return (-1); } memcpy(&kr->r.prefix, &in6addr_loopback, sizeof(kr->r.prefix)); kr->r.prefixlen = 128; 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 mask2prefixlen(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); } struct in6_addr * prefixlen2mask(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 kroute_node *kr, *tkr; struct iface *iface; u_int8_t reachable; if ((iface = kif_update(ifindex, flags, ifd, NULL)) == NULL) { log_warn("if_change: kif_update(%u)", ifindex); return; } reachable = (iface->flags & IFF_UP) && (LINK_STATE_IS_UP(iface->linkstate) || (iface->linkstate == LINK_STATE_UNKNOWN && iface->media_type != IFT_CARP)); if (reachable == iface->nh_reachable) return; /* nothing changed wrt nexthop validity */ iface->nh_reachable = reachable; /* notify ospfe about interface link state */ if (iface->cflags & F_IFACE_CONFIGURED) main_imsg_compose_ospfe(IMSG_IFINFO, 0, iface, sizeof(struct iface)); /* 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_in6 *ifa, struct sockaddr_in6 *mask, struct sockaddr_in6 *brd) { struct iface *iface; struct iface_addr *ia; if (ifa == NULL || ifa->sin6_family != AF_INET6) return; if ((iface = if_find(ifindex)) == NULL) { log_warnx("if_newaddr: corresponding if %i not found", ifindex); return; } /* We only care about link-local and global-scope. */ if (IN6_IS_ADDR_UNSPECIFIED(&ifa->sin6_addr) || IN6_IS_ADDR_LOOPBACK(&ifa->sin6_addr) || IN6_IS_ADDR_MULTICAST(&ifa->sin6_addr) || IN6_IS_ADDR_SITELOCAL(&ifa->sin6_addr) || IN6_IS_ADDR_V4MAPPED(&ifa->sin6_addr) || IN6_IS_ADDR_V4COMPAT(&ifa->sin6_addr)) return; /* XXX thanks, KAME, for this ugliness... adopted from route/show.c */ if (IN6_IS_ADDR_LINKLOCAL(&ifa->sin6_addr)) { ifa->sin6_addr.s6_addr[2] = 0; ifa->sin6_addr.s6_addr[3] = 0; } if (IN6_IS_ADDR_LINKLOCAL(&ifa->sin6_addr)) iface->addr = ifa->sin6_addr; if ((ia = calloc(1, sizeof(struct iface_addr))) == NULL) fatal("if_newaddr"); ia->addr = ifa->sin6_addr; if (mask) ia->prefixlen = mask2prefixlen(mask); else ia->prefixlen = 0; if (brd && brd->sin6_family == AF_INET6) ia->dstbrd = brd->sin6_addr; else bzero(&ia->dstbrd, sizeof(ia->dstbrd)); switch (iface->type) { case IF_TYPE_BROADCAST: case IF_TYPE_NBMA: log_debug("if_newaddr: ifindex %u, addr %s/%d", ifindex, log_in6addr(&ia->addr), ia->prefixlen); break; case IF_TYPE_VIRTUALLINK: /* FIXME */ break; case IF_TYPE_POINTOPOINT: case IF_TYPE_POINTOMULTIPOINT: log_debug("if_newaddr: ifindex %u, addr %s/%d, " "dest %s", ifindex, log_in6addr(&ia->addr), ia->prefixlen, log_in6addr(&ia->dstbrd)); break; default: fatalx("if_newaddr: unknown interface type"); } TAILQ_INSERT_TAIL(&iface->ifa_list, ia, entry); } void if_announce(void *msg) { struct if_announcemsghdr *ifan; struct iface *iface; ifan = msg; switch (ifan->ifan_what) { case IFAN_ARRIVAL: if ((iface = if_new(ifan->ifan_index, ifan->ifan_name)) == NULL) fatal("if_announce failed"); iface->cflags |= F_IFACE_AVAIL; break; case IFAN_DEPARTURE: iface = if_find(ifan->ifan_index); if (iface->cflags & F_IFACE_CONFIGURED) { main_imsg_compose_rde(IMSG_IFDELETE, 0, &iface->ifindex, sizeof(iface->ifindex)); main_imsg_compose_ospfe(IMSG_IFDELETE, 0, &iface->ifindex, sizeof(iface->ifindex)); } if_del(iface); break; } } /* rtsock */ int send_rtmsg(int fd, int action, struct kroute *kroute) { struct iovec iov[5]; struct rt_msghdr hdr; struct sockaddr_in6 prefix; struct sockaddr_in6 nexthop; struct sockaddr_in6 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_flags = RTF_PROTO2; hdr.rtm_priority = RTP_OSPF; if (action == RTM_CHANGE) /* force PROTO2 reset the other flags */ hdr.rtm_fmask = RTF_PROTO2|RTF_PROTO1|RTF_REJECT|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); bzero(&prefix, sizeof(prefix)); prefix.sin6_len = sizeof(prefix); prefix.sin6_family = AF_INET6; prefix.sin6_addr = kroute->prefix; /* 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 (!IN6_IS_ADDR_UNSPECIFIED(&kroute->nexthop)) { bzero(&nexthop, sizeof(nexthop)); nexthop.sin6_len = sizeof(nexthop); nexthop.sin6_family = AF_INET6; nexthop.sin6_addr = kroute->nexthop; /* 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.sin6_len = sizeof(mask); mask.sin6_family = AF_INET6; mask.sin6_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) { switch (errno) { case 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_sockaddr(&prefix), kroute->prefixlen); return (0); } else { log_warn("send_rtmsg: action %u, " "prefix %s/%u", hdr.rtm_type, log_sockaddr(&prefix), kroute->prefixlen); return (0); } break; default: log_warn("send_rtmsg: action %u, prefix %s/%u", hdr.rtm_type, log_sockaddr(&prefix), kroute->prefixlen); return (0); } } return (0); } int fetchtable(void) { size_t len; int mib[7]; char *buf, *next, *lim; struct rt_msghdr *rtm; struct sockaddr *sa, *rti_info[RTAX_MAX]; struct sockaddr_in6 *sa_in6; struct sockaddr_rtlabel *label; struct kroute_node *kr; mib[0] = CTL_NET; mib[1] = AF_ROUTE; mib[2] = 0; mib[3] = AF_INET; mib[4] = NET_RT_DUMP; mib[5] = 0; mib[6] = 0; /* 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); } lim = buf + len; for (next = buf; next < lim; next += rtm->rtm_msglen) { rtm = (struct rt_msghdr *)next; if (rtm->rtm_version != RTM_VERSION) continue; 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; if ((kr = calloc(1, sizeof(struct kroute_node))) == NULL) { log_warn("fetchtable"); free(buf); return (-1); } kr->r.flags = F_KERNEL; switch (sa->sa_family) { case AF_INET6: kr->r.prefix = ((struct sockaddr_in6 *)sa)->sin6_addr; sa_in6 = (struct sockaddr_in6 *)rti_info[RTAX_NETMASK]; if (rtm->rtm_flags & RTF_STATIC) kr->r.flags |= F_STATIC; if (rtm->rtm_flags & RTF_DYNAMIC) kr->r.flags |= F_DYNAMIC; if (rtm->rtm_flags & RTF_PROTO1) kr->r.flags |= F_BGPD_INSERTED; if (sa_in6 != NULL) { if (sa_in6->sin6_len == 0) break; kr->r.prefixlen = mask2prefixlen(sa_in6); } else if (rtm->rtm_flags & RTF_HOST) kr->r.prefixlen = 128; else fatalx("classful IPv6 route?!!"); break; default: free(kr); continue; } kr->r.ifindex = rtm->rtm_index; if ((sa = rti_info[RTAX_GATEWAY]) != NULL) switch (sa->sa_family) { case AF_INET6: kr->r.nexthop = ((struct sockaddr_in6 *)sa)->sin6_addr; break; case AF_LINK: kr->r.flags |= F_CONNECTED; break; } if (rtm->rtm_flags & RTF_PROTO2) { send_rtmsg(kr_state.fd, RTM_DELETE, &kr->r); free(kr); } 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); } } free(buf); return (0); } int fetchifs(u_short ifindex) { size_t len; int mib[6]; char *buf, *next, *lim; struct rt_msghdr *rtm; struct if_msghdr ifm; struct ifa_msghdr *ifam; struct iface *iface; struct sockaddr *sa, *rti_info[RTAX_MAX]; mib[0] = CTL_NET; mib[1] = AF_ROUTE; mib[2] = 0; mib[3] = AF_INET6; 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 += rtm->rtm_msglen) { rtm = (struct rt_msghdr *)next; if (rtm->rtm_version != RTM_VERSION) continue; switch (rtm->rtm_type) { case RTM_IFINFO: bcopy(rtm, &ifm, sizeof ifm); sa = (struct sockaddr *)(next + sizeof(ifm)); get_rtaddrs(ifm.ifm_addrs, sa, rti_info); if ((iface = kif_update(ifm.ifm_index, ifm.ifm_flags, &ifm.ifm_data, (struct sockaddr_dl *)rti_info[RTAX_IFP])) == NULL) fatal("fetchifs"); iface->nh_reachable = (iface->flags & IFF_UP) && (LINK_STATE_IS_UP(ifm.ifm_data.ifi_link_state) || (ifm.ifm_data.ifi_link_state == LINK_STATE_UNKNOWN && ifm.ifm_data.ifi_type != IFT_CARP)); break; case RTM_NEWADDR: ifam = (struct ifa_msghdr *)rtm; if ((ifam->ifam_addrs & (RTA_NETMASK | RTA_IFA | RTA_BRD)) == 0) break; sa = (struct sockaddr *)(ifam + 1); get_rtaddrs(ifam->ifam_addrs, sa, rti_info); if_newaddr(ifam->ifam_index, (struct sockaddr_in6 *)rti_info[RTAX_IFA], (struct sockaddr_in6 *)rti_info[RTAX_NETMASK], (struct sockaddr_in6 *)rti_info[RTAX_BRD]); break; } } 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 ifa_msghdr *ifam; struct sockaddr *sa, *rti_info[RTAX_MAX]; struct sockaddr_in6 *sa_in6; struct sockaddr_rtlabel *label; struct kroute_node *kr, *okr; struct in6_addr prefix, nexthop; u_int8_t prefixlen; int flags, mpath; u_short ifindex = 0; 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; if (rtm->rtm_version != RTM_VERSION) continue; bzero(&prefix, sizeof(prefix)); bzero(&nexthop, sizeof(nexthop)); prefixlen = 0; flags = F_KERNEL; mpath = 0; if (rtm->rtm_type == RTM_ADD || rtm->rtm_type == RTM_CHANGE || rtm->rtm_type == RTM_DELETE) { sa = (struct sockaddr *)(rtm + 1); get_rtaddrs(rtm->rtm_addrs, sa, rti_info); if (rtm->rtm_tableid != 0) continue; if (rtm->rtm_pid == kr_state.pid) /* caused by us */ continue; if (rtm->rtm_errno) /* failed attempts... */ continue; if (rtm->rtm_flags & RTF_LLINFO) /* arp cache */ continue; #ifdef RTF_MPATH if (rtm->rtm_flags & RTF_MPATH) mpath = 1; #endif switch (sa->sa_family) { case AF_INET6: prefix = ((struct sockaddr_in6 *)sa)->sin6_addr; sa_in6 = (struct sockaddr_in6 *) rti_info[RTAX_NETMASK]; if (sa_in6 != NULL) { if (sa_in6->sin6_len != 0) prefixlen = mask2prefixlen( sa_in6); } else if (rtm->rtm_flags & RTF_HOST) prefixlen = 128; else fatalx("classful IPv6 address?!!"); if (rtm->rtm_flags & RTF_STATIC) flags |= F_STATIC; if (rtm->rtm_flags & RTF_DYNAMIC) flags |= F_DYNAMIC; if (rtm->rtm_flags & RTF_PROTO1) flags |= F_BGPD_INSERTED; break; default: continue; } ifindex = rtm->rtm_index; if ((sa = rti_info[RTAX_GATEWAY]) != NULL) { switch (sa->sa_family) { case AF_INET: nexthop = ((struct sockaddr_in6 *) sa)->sin6_addr; break; case AF_LINK: flags |= F_CONNECTED; break; } } } switch (rtm->rtm_type) { case RTM_ADD: case RTM_CHANGE: if (IN6_IS_ADDR_UNSPECIFIED(&nexthop) == 0 && !(flags & F_CONNECTED)) { log_warnx("dispatch_rtmsg no nexthop for %s/%u", log_in6addr(&prefix), prefixlen); continue; } if ((okr = kroute_find(&prefix, prefixlen)) != NULL) { /* just add new multipath routes */ if (mpath && rtm->rtm_type == RTM_ADD) goto add; /* get the correct route */ kr = okr; if (mpath && (kr = kroute_matchgw(okr, &nexthop)) == NULL) { log_warnx("dispatch_rtmsg mpath route" " not found"); /* add routes we missed out earlier */ goto add; } /* * ospf route overridden by kernel. Preference * of the route is not checked because this is * forced -- most probably by a user. */ if (kr->r.flags & F_OSPFD_INSERTED) flags |= F_OSPFD_INSERTED; if (kr->r.flags & F_REDISTRIBUTED) flags |= F_REDISTRIBUTED; kr->r.nexthop = nexthop; 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_redistribute(okr); } else { add: if ((kr = calloc(1, sizeof(struct kroute_node))) == NULL) { log_warn("dispatch_rtmsg"); return (-1); } kr->r.prefix = prefix; kr->r.prefixlen = prefixlen; kr->r.nexthop = nexthop; kr->r.flags = flags; kr->r.ifindex = ifindex; 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, prefixlen)) == 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("dispatch_rtmsg mpath route" " not found"); return (-1); } /* * last route is getting removed request the * ospf route from the RDE to insert instead */ if (okr == kr && kr->next == NULL && kr->r.flags & F_OSPFD_INSERTED) main_imsg_compose_rde(IMSG_KROUTE_GET, 0, &kr->r, sizeof(struct kroute)); 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); break; case RTM_NEWADDR: ifam = (struct ifa_msghdr *)rtm; if ((ifam->ifam_addrs & (RTA_NETMASK | RTA_IFA | RTA_BRD)) == 0) break; sa = (struct sockaddr *)(ifam + 1); get_rtaddrs(ifam->ifam_addrs, sa, rti_info); if_newaddr(ifam->ifam_index, (struct sockaddr_in6 *)rti_info[RTAX_IFA], (struct sockaddr_in6 *)rti_info[RTAX_NETMASK], (struct sockaddr_in6 *)rti_info[RTAX_BRD]); break; case RTM_IFANNOUNCE: if_announce(next); break; default: /* ignore for now */ break; } } return (0); }