/* $OpenBSD: ospfd.c,v 1.88 2015/12/05 12:20:13 claudio Exp $ */ /* * Copyright (c) 2005 Claudio Jeker * 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 "ospfd.h" #include "ospf.h" #include "ospfe.h" #include "control.h" #include "log.h" #include "rde.h" void main_sig_handler(int, short, void *); __dead void usage(void); void ospfd_shutdown(void); int check_child(pid_t, const char *); void main_dispatch_ospfe(int, short, void *); void main_dispatch_rde(int, short, void *); int ospf_reload(void); int ospf_sendboth(enum imsg_type, void *, u_int16_t); int merge_interfaces(struct area *, struct area *); struct iface *iface_lookup(struct area *, struct iface *); int pipe_parent2ospfe[2]; int pipe_parent2rde[2]; int pipe_ospfe2rde[2]; struct ospfd_conf *ospfd_conf = NULL; struct imsgev *iev_ospfe; struct imsgev *iev_rde; char *conffile; pid_t ospfe_pid = 0; pid_t rde_pid = 0; /* ARGSUSED */ void main_sig_handler(int sig, short event, void *arg) { /* * signal handler rules don't apply, libevent decouples for us */ int die = 0; switch (sig) { case SIGTERM: case SIGINT: die = 1; /* FALLTHROUGH */ case SIGCHLD: if (check_child(ospfe_pid, "ospf engine")) { ospfe_pid = 0; die = 1; } if (check_child(rde_pid, "route decision engine")) { rde_pid = 0; die = 1; } if (die) ospfd_shutdown(); break; case SIGHUP: if (ospf_reload() == -1) log_warnx("configuration reload failed"); else log_debug("configuration reloaded"); break; default: fatalx("unexpected signal"); /* NOTREACHED */ } } __dead void usage(void) { extern char *__progname; fprintf(stderr, "usage: %s [-cdnv] [-D macro=value]" " [-f file] [-s socket]\n", __progname); exit(1); } int main(int argc, char *argv[]) { struct event ev_sigint, ev_sigterm, ev_sigchld, ev_sighup; struct area *a; int ch, opts = 0; int debug = 0; int ipforwarding; int mib[4]; size_t len; char *sockname; conffile = CONF_FILE; ospfd_process = PROC_MAIN; sockname = OSPFD_SOCKET; log_init(1); /* log to stderr until daemonized */ log_verbose(1); while ((ch = getopt(argc, argv, "cdD:f:ns:v")) != -1) { switch (ch) { case 'c': opts |= OSPFD_OPT_FORCE_DEMOTE; break; case 'd': debug = 1; break; case 'D': if (cmdline_symset(optarg) < 0) log_warnx("could not parse macro definition %s", optarg); break; case 'f': conffile = optarg; break; case 'n': opts |= OSPFD_OPT_NOACTION; break; case 's': sockname = optarg; break; case 'v': if (opts & OSPFD_OPT_VERBOSE) opts |= OSPFD_OPT_VERBOSE2; opts |= OSPFD_OPT_VERBOSE; break; default: usage(); /* NOTREACHED */ } } argc -= optind; argv += optind; if (argc > 0) usage(); mib[0] = CTL_NET; mib[1] = PF_INET; mib[2] = IPPROTO_IP; mib[3] = IPCTL_FORWARDING; len = sizeof(ipforwarding); if (sysctl(mib, 4, &ipforwarding, &len, NULL, 0) == -1) err(1, "sysctl"); if (ipforwarding != 1) { log_warnx("WARNING: IP forwarding NOT enabled, " "running as stub router"); opts |= OSPFD_OPT_STUB_ROUTER; } /* fetch interfaces early */ kif_init(); /* parse config file */ if ((ospfd_conf = parse_config(conffile, opts)) == NULL) { kif_clear(); exit(1); } ospfd_conf->csock = sockname; if (ospfd_conf->opts & OSPFD_OPT_NOACTION) { if (ospfd_conf->opts & OSPFD_OPT_VERBOSE) print_config(ospfd_conf); else fprintf(stderr, "configuration OK\n"); kif_clear(); exit(0); } /* check for root privileges */ if (geteuid()) errx(1, "need root privileges"); /* check for ospfd user */ if (getpwnam(OSPFD_USER) == NULL) errx(1, "unknown user %s", OSPFD_USER); log_init(debug); log_verbose(ospfd_conf->opts & OSPFD_OPT_VERBOSE); if (!debug) daemon(1, 0); log_info("startup"); if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, PF_UNSPEC, pipe_parent2ospfe) == -1) fatal("socketpair"); if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, PF_UNSPEC, pipe_parent2rde) == -1) fatal("socketpair"); if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, PF_UNSPEC, pipe_ospfe2rde) == -1) fatal("socketpair"); /* start children */ rde_pid = rde(ospfd_conf, pipe_parent2rde, pipe_ospfe2rde, pipe_parent2ospfe); ospfe_pid = ospfe(ospfd_conf, pipe_parent2ospfe, pipe_ospfe2rde, pipe_parent2rde); /* show who we are */ setproctitle("parent"); event_init(); /* setup signal handler */ signal_set(&ev_sigint, SIGINT, main_sig_handler, NULL); signal_set(&ev_sigterm, SIGTERM, main_sig_handler, NULL); signal_set(&ev_sigchld, SIGCHLD, main_sig_handler, NULL); signal_set(&ev_sighup, SIGHUP, main_sig_handler, NULL); signal_add(&ev_sigint, NULL); signal_add(&ev_sigterm, NULL); signal_add(&ev_sigchld, NULL); signal_add(&ev_sighup, NULL); signal(SIGPIPE, SIG_IGN); /* setup pipes to children */ close(pipe_parent2ospfe[1]); close(pipe_parent2rde[1]); close(pipe_ospfe2rde[0]); close(pipe_ospfe2rde[1]); if ((iev_ospfe = malloc(sizeof(struct imsgev))) == NULL || (iev_rde = malloc(sizeof(struct imsgev))) == NULL) fatal(NULL); imsg_init(&iev_ospfe->ibuf, pipe_parent2ospfe[0]); iev_ospfe->handler = main_dispatch_ospfe; imsg_init(&iev_rde->ibuf, pipe_parent2rde[0]); iev_rde->handler = main_dispatch_rde; /* setup event handler */ iev_ospfe->events = EV_READ; event_set(&iev_ospfe->ev, iev_ospfe->ibuf.fd, iev_ospfe->events, iev_ospfe->handler, iev_ospfe); event_add(&iev_ospfe->ev, NULL); iev_rde->events = EV_READ; event_set(&iev_rde->ev, iev_rde->ibuf.fd, iev_rde->events, iev_rde->handler, iev_rde); event_add(&iev_rde->ev, NULL); if (kr_init(!(ospfd_conf->flags & OSPFD_FLAG_NO_FIB_UPDATE), ospfd_conf->rdomain) == -1) fatalx("kr_init failed"); /* remove unneded stuff from config */ while ((a = LIST_FIRST(&ospfd_conf->area_list)) != NULL) { LIST_REMOVE(a, entry); area_del(a); } event_dispatch(); ospfd_shutdown(); /* NOTREACHED */ return (0); } void ospfd_shutdown(void) { pid_t pid; struct redistribute *r; if (ospfe_pid) kill(ospfe_pid, SIGTERM); if (rde_pid) kill(rde_pid, SIGTERM); control_cleanup(ospfd_conf->csock); while ((r = SIMPLEQ_FIRST(&ospfd_conf->redist_list)) != NULL) { SIMPLEQ_REMOVE_HEAD(&ospfd_conf->redist_list, entry); free(r); } kr_shutdown(); carp_demote_shutdown(); do { if ((pid = wait(NULL)) == -1 && errno != EINTR && errno != ECHILD) fatal("wait"); } while (pid != -1 || (pid == -1 && errno == EINTR)); msgbuf_clear(&iev_ospfe->ibuf.w); free(iev_ospfe); msgbuf_clear(&iev_rde->ibuf.w); free(iev_rde); free(ospfd_conf); log_info("terminating"); exit(0); } int check_child(pid_t pid, const char *pname) { int status; if (waitpid(pid, &status, WNOHANG) > 0) { if (WIFEXITED(status)) { log_warnx("lost child: %s exited", pname); return (1); } if (WIFSIGNALED(status)) { log_warnx("lost child: %s terminated; signal %d", pname, WTERMSIG(status)); return (1); } } return (0); } /* imsg handling */ /* ARGSUSED */ void main_dispatch_ospfe(int fd, short event, void *bula) { struct imsgev *iev = bula; struct imsgbuf *ibuf; struct imsg imsg; struct demote_msg dmsg; ssize_t n; int shut = 0, verbose; ibuf = &iev->ibuf; if (event & EV_READ) { if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN) fatal("imsg_read error"); if (n == 0) /* connection closed */ shut = 1; } if (event & EV_WRITE) { if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN) fatal("msgbuf_write"); if (n == 0) /* connection closed */ shut = 1; } for (;;) { if ((n = imsg_get(ibuf, &imsg)) == -1) fatal("imsg_get"); if (n == 0) break; switch (imsg.hdr.type) { case IMSG_CTL_RELOAD: if (ospf_reload() == -1) log_warnx("configuration reload failed"); else log_debug("configuration reloaded"); break; case IMSG_CTL_FIB_COUPLE: kr_fib_couple(); break; case IMSG_CTL_FIB_DECOUPLE: kr_fib_decouple(); break; case IMSG_CTL_FIB_RELOAD: kr_fib_reload(); break; case IMSG_CTL_KROUTE: case IMSG_CTL_KROUTE_ADDR: kr_show_route(&imsg); break; case IMSG_CTL_IFINFO: if (imsg.hdr.len == IMSG_HEADER_SIZE) kr_ifinfo(NULL, imsg.hdr.pid); else if (imsg.hdr.len == IMSG_HEADER_SIZE + IFNAMSIZ) kr_ifinfo(imsg.data, imsg.hdr.pid); else log_warnx("IFINFO request with wrong len"); break; case IMSG_DEMOTE: if (imsg.hdr.len - IMSG_HEADER_SIZE != sizeof(dmsg)) fatalx("invalid size of OE request"); memcpy(&dmsg, imsg.data, sizeof(dmsg)); carp_demote_set(dmsg.demote_group, dmsg.level); break; case IMSG_CTL_LOG_VERBOSE: /* already checked by ospfe */ memcpy(&verbose, imsg.data, sizeof(verbose)); log_verbose(verbose); break; default: log_debug("main_dispatch_ospfe: error handling imsg %d", imsg.hdr.type); break; } imsg_free(&imsg); } if (!shut) imsg_event_add(iev); else { /* this pipe is dead, so remove the event handler */ event_del(&iev->ev); event_loopexit(NULL); } } /* ARGSUSED */ void main_dispatch_rde(int fd, short event, void *bula) { struct imsgev *iev = bula; struct imsgbuf *ibuf; struct imsg imsg; ssize_t n; int count, shut = 0; ibuf = &iev->ibuf; if (event & EV_READ) { if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN) fatal("imsg_read error"); if (n == 0) /* connection closed */ shut = 1; } if (event & EV_WRITE) { if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN) fatal("msgbuf_write"); if (n == 0) /* connection closed */ shut = 1; } for (;;) { if ((n = imsg_get(ibuf, &imsg)) == -1) fatal("imsg_get"); if (n == 0) break; switch (imsg.hdr.type) { case IMSG_KROUTE_CHANGE: count = (imsg.hdr.len - IMSG_HEADER_SIZE) / sizeof(struct kroute); if (kr_change(imsg.data, count)) log_warn("main_dispatch_rde: error changing " "route"); break; case IMSG_KROUTE_DELETE: if (kr_delete(imsg.data)) log_warn("main_dispatch_rde: error deleting " "route"); break; default: log_debug("main_dispatch_rde: error handling imsg %d", imsg.hdr.type); break; } imsg_free(&imsg); } if (!shut) imsg_event_add(iev); else { /* this pipe is dead, so remove the event handler */ event_del(&iev->ev); event_loopexit(NULL); } } void main_imsg_compose_ospfe(int type, pid_t pid, void *data, u_int16_t datalen) { if (iev_ospfe) imsg_compose_event(iev_ospfe, type, 0, pid, -1, data, datalen); } void main_imsg_compose_rde(int type, pid_t pid, void *data, u_int16_t datalen) { if (iev_rde) imsg_compose_event(iev_rde, type, 0, pid, -1, data, datalen); } void imsg_event_add(struct imsgev *iev) { iev->events = EV_READ; if (iev->ibuf.w.queued) iev->events |= EV_WRITE; event_del(&iev->ev); event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev); event_add(&iev->ev, NULL); } int imsg_compose_event(struct imsgev *iev, u_int16_t type, u_int32_t peerid, pid_t pid, int fd, void *data, u_int16_t datalen) { int ret; if ((ret = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data, datalen)) != -1) imsg_event_add(iev); return (ret); } int ospf_redistribute(struct kroute *kr, u_int32_t *metric) { struct redistribute *r; u_int8_t is_default = 0; /* only allow 0.0.0.0/0 via REDIST_DEFAULT */ if (kr->prefix.s_addr == INADDR_ANY && kr->prefixlen == 0) is_default = 1; SIMPLEQ_FOREACH(r, &ospfd_conf->redist_list, entry) { switch (r->type & ~REDIST_NO) { case REDIST_LABEL: if (kr->rtlabel == r->label) { *metric = r->metric; return (r->type & REDIST_NO ? 0 : 1); } break; case REDIST_STATIC: /* * Dynamic routes are not redistributable. Placed here * so that link local addresses can be redistributed * via a rtlabel. */ if (is_default) continue; if (kr->flags & F_DYNAMIC) continue; if (kr->flags & F_STATIC) { *metric = r->metric; return (r->type & REDIST_NO ? 0 : 1); } break; case REDIST_CONNECTED: if (is_default) continue; if (kr->flags & F_DYNAMIC) continue; if (kr->flags & F_CONNECTED) { *metric = r->metric; return (r->type & REDIST_NO ? 0 : 1); } break; case REDIST_ADDR: if (kr->flags & F_DYNAMIC) continue; if (r->addr.s_addr == INADDR_ANY && r->mask.s_addr == INADDR_ANY) { if (is_default) { *metric = r->metric; return (r->type & REDIST_NO ? 0 : 1); } else return (0); } if ((kr->prefix.s_addr & r->mask.s_addr) == (r->addr.s_addr & r->mask.s_addr) && kr->prefixlen >= mask2prefixlen(r->mask.s_addr)) { *metric = r->metric; return (r->type & REDIST_NO ? 0 : 1); } break; case REDIST_DEFAULT: if (is_default) { *metric = r->metric; return (r->type & REDIST_NO ? 0 : 1); } break; } } return (0); } int ospf_reload(void) { struct area *area; struct iface *iface; struct ospfd_conf *xconf; struct redistribute *r; if ((xconf = parse_config(conffile, ospfd_conf->opts)) == NULL) return (-1); /* send config to childs */ if (ospf_sendboth(IMSG_RECONF_CONF, xconf, sizeof(*xconf)) == -1) return (-1); /* send interfaces */ LIST_FOREACH(area, &xconf->area_list, entry) { if (ospf_sendboth(IMSG_RECONF_AREA, area, sizeof(*area)) == -1) return (-1); SIMPLEQ_FOREACH(r, &area->redist_list, entry) { main_imsg_compose_rde(IMSG_RECONF_REDIST, 0, r, sizeof(*r)); } LIST_FOREACH(iface, &area->iface_list, entry) { if (ospf_sendboth(IMSG_RECONF_IFACE, iface, sizeof(*iface)) == -1) return (-1); if (iface->auth_type == AUTH_CRYPT) if (md_list_send(&iface->auth_md_list, iev_ospfe) == -1) return (-1); } } if (ospf_sendboth(IMSG_RECONF_END, NULL, 0) == -1) return (-1); merge_config(ospfd_conf, xconf); /* update redistribute lists */ kr_reload(); return (0); } int ospf_sendboth(enum imsg_type type, void *buf, u_int16_t len) { if (imsg_compose_event(iev_ospfe, type, 0, 0, -1, buf, len) == -1) return (-1); if (imsg_compose_event(iev_rde, type, 0, 0, -1, buf, len) == -1) return (-1); return (0); } void merge_config(struct ospfd_conf *conf, struct ospfd_conf *xconf) { struct area *a, *xa, *na; struct iface *iface; struct redistribute *r; int rchange = 0; /* change of rtr_id needs a restart */ conf->flags = xconf->flags; conf->spf_delay = xconf->spf_delay; conf->spf_hold_time = xconf->spf_hold_time; if (SIMPLEQ_EMPTY(&conf->redist_list) != SIMPLEQ_EMPTY(&xconf->redist_list)) rchange = 1; conf->rfc1583compat = xconf->rfc1583compat; if (ospfd_process == PROC_MAIN) { /* main process does neither use areas nor interfaces */ while ((r = SIMPLEQ_FIRST(&conf->redist_list)) != NULL) { SIMPLEQ_REMOVE_HEAD(&conf->redist_list, entry); free(r); } while ((r = SIMPLEQ_FIRST(&xconf->redist_list)) != NULL) { SIMPLEQ_REMOVE_HEAD(&xconf->redist_list, entry); SIMPLEQ_INSERT_TAIL(&conf->redist_list, r, entry); } goto done; } /* merge areas and interfaces */ for (a = LIST_FIRST(&conf->area_list); a != NULL; a = na) { na = LIST_NEXT(a, entry); /* find deleted areas */ if ((xa = area_find(xconf, a->id)) == NULL) { if (ospfd_process == PROC_OSPF_ENGINE) { LIST_FOREACH(iface, &a->iface_list, entry) if_fsm(iface, IF_EVT_DOWN); } LIST_REMOVE(a, entry); area_del(a); } } for (xa = LIST_FIRST(&xconf->area_list); xa != NULL; xa = na) { na = LIST_NEXT(xa, entry); if ((a = area_find(conf, xa->id)) == NULL) { LIST_REMOVE(xa, entry); LIST_INSERT_HEAD(&conf->area_list, xa, entry); if (ospfd_process == PROC_OSPF_ENGINE) { /* start interfaces */ ospfe_demote_area(xa, 0); LIST_FOREACH(iface, &xa->iface_list, entry) { if_init(conf, iface); if (if_fsm(iface, IF_EVT_UP)) { log_debug("error starting " "interface %s", iface->name); } } } /* no need to merge interfaces */ continue; } /* * stub is not yet used but switching between stub and normal * will be another painful job. */ if (a->stub != xa->stub && ospfd_process == PROC_OSPF_ENGINE) a->dirty = 1; /* force rtr LSA update */ if (xa->stub && ospfd_process == PROC_RDE_ENGINE) { while ((r = SIMPLEQ_FIRST(&a->redist_list)) != NULL) { SIMPLEQ_REMOVE_HEAD(&a->redist_list, entry); free(r); } while ((r = SIMPLEQ_FIRST(&xa->redist_list)) != NULL) { SIMPLEQ_REMOVE_HEAD(&xa->redist_list, entry); SIMPLEQ_INSERT_TAIL(&a->redist_list, r, entry); } } a->stub = xa->stub; a->stub_default_cost = xa->stub_default_cost; if (ospfd_process == PROC_RDE_ENGINE) a->dirty = 1; /* force SPF tree recalculation */ /* merge interfaces */ if (merge_interfaces(a, xa) && ospfd_process == PROC_OSPF_ENGINE) a->dirty = 1; /* force rtr LSA update */ } if (ospfd_process == PROC_OSPF_ENGINE) { LIST_FOREACH(a, &conf->area_list, entry) { LIST_FOREACH(iface, &a->iface_list, entry) { if (iface->state == IF_STA_NEW) { iface->state = IF_STA_DOWN; if_init(conf, iface); if (if_fsm(iface, IF_EVT_UP)) { log_debug("error starting " "interface %s", iface->name); } } } if (a->dirty || rchange) { a->dirty = 0; orig_rtr_lsa(a); } } } if (ospfd_process == PROC_RDE_ENGINE) { LIST_FOREACH(a, &conf->area_list, entry) { if (a->dirty) { start_spf_timer(); break; } } } done: while ((a = LIST_FIRST(&xconf->area_list)) != NULL) { LIST_REMOVE(a, entry); area_del(a); } free(xconf); } int merge_interfaces(struct area *a, struct area *xa) { struct iface *i, *xi, *ni; int dirty = 0; /* problems: * - new interfaces (easy) * - deleted interfaces (needs to be done via fsm?) * - changing passive (painful?) */ for (i = LIST_FIRST(&a->iface_list); i != NULL; i = ni) { ni = LIST_NEXT(i, entry); if (iface_lookup(xa, i) == NULL) { log_debug("merge_interfaces: proc %d area %s removing " "interface %s", ospfd_process, inet_ntoa(a->id), i->name); if (ospfd_process == PROC_OSPF_ENGINE) if_fsm(i, IF_EVT_DOWN); else if (ospfd_process == PROC_RDE_ENGINE) rde_nbr_iface_del(i); LIST_REMOVE(i, entry); if_del(i); } } for (xi = LIST_FIRST(&xa->iface_list); xi != NULL; xi = ni) { ni = LIST_NEXT(xi, entry); if ((i = iface_lookup(a, xi)) == NULL) { /* new interface but delay initialisation */ log_debug("merge_interfaces: proc %d area %s adding " "interface %s", ospfd_process, inet_ntoa(a->id), xi->name); LIST_REMOVE(xi, entry); LIST_INSERT_HEAD(&a->iface_list, xi, entry); xi->area = a; if (ospfd_process == PROC_OSPF_ENGINE) xi->state = IF_STA_NEW; continue; } log_debug("merge_interfaces: proc %d area %s merging " "interface %s", ospfd_process, inet_ntoa(a->id), i->name); i->dst = xi->dst; i->abr_id = xi->abr_id; i->baudrate = xi->baudrate; i->dead_interval = xi->dead_interval; i->mtu = xi->mtu; i->transmit_delay = xi->transmit_delay; i->hello_interval = xi->hello_interval; i->rxmt_interval = xi->rxmt_interval; if (i->metric != xi->metric) dirty = 1; i->metric = xi->metric; i->priority = xi->priority; if (i->self) i->self->priority = i->priority; i->flags = xi->flags; /* needed? */ i->type = xi->type; /* needed? */ i->if_type = xi->if_type; /* needed? */ i->linkstate = xi->linkstate; /* needed? */ i->auth_type = xi->auth_type; strncpy(i->auth_key, xi->auth_key, MAX_SIMPLE_AUTH_LEN); md_list_clr(&i->auth_md_list); md_list_copy(&i->auth_md_list, &xi->auth_md_list); if (i->passive != xi->passive) { /* need to restart interface to cope with this change */ if (ospfd_process == PROC_OSPF_ENGINE) if_fsm(i, IF_EVT_DOWN); i->passive = xi->passive; if (ospfd_process == PROC_OSPF_ENGINE) if_fsm(i, IF_EVT_UP); } } return (dirty); } struct iface * iface_lookup(struct area *area, struct iface *iface) { struct iface *i; LIST_FOREACH(i, &area->iface_list, entry) if (i->ifindex == iface->ifindex && i->addr.s_addr == iface->addr.s_addr && i->mask.s_addr == iface->mask.s_addr) return (i); return (NULL); }