diff options
Diffstat (limited to '')
| -rw-r--r-- | ldpd/lde.c | 2535 |
1 files changed, 2535 insertions, 0 deletions
diff --git a/ldpd/lde.c b/ldpd/lde.c new file mode 100644 index 0000000..efc07b4 --- /dev/null +++ b/ldpd/lde.c @@ -0,0 +1,2535 @@ +/* $OpenBSD$ */ + +/* + * Copyright (c) 2013, 2016 Renato Westphal <renato@openbsd.org> + * Copyright (c) 2004, 2005 Claudio Jeker <claudio@openbsd.org> + * 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 <zebra.h> + +#include "ldp.h" +#include "ldpd.h" +#include "ldpe.h" +#include "log.h" +#include "lde.h" +#include "ldp_debug.h" +#include "rlfa.h" + +#include <lib/log.h> +#include "memory.h" +#include "privs.h" +#include "sigevent.h" +#include "mpls.h" +#include <lib/linklist.h> +#include "zclient.h" +#include "stream.h" +#include "network.h" +#include "libfrr.h" + +static void lde_shutdown(void); +static void lde_dispatch_imsg(struct thread *thread); +static void lde_dispatch_parent(struct thread *thread); +static __inline int lde_nbr_compare(const struct lde_nbr *, + const struct lde_nbr *); +static struct lde_nbr *lde_nbr_new(uint32_t, struct lde_nbr *); +static void lde_nbr_del(struct lde_nbr *); +static struct lde_nbr *lde_nbr_find(uint32_t); +static void lde_nbr_clear(void); +static void lde_nbr_addr_update(struct lde_nbr *, + struct lde_addr *, int); +static __inline int lde_map_compare(const struct lde_map *, + const struct lde_map *); +static void lde_map_free(void *); +static int lde_address_add(struct lde_nbr *, struct lde_addr *); +static int lde_address_del(struct lde_nbr *, struct lde_addr *); +static void lde_address_list_free(struct lde_nbr *); +static void zclient_sync_init(void); +static void lde_label_list_init(void); +static int lde_get_label_chunk(void); +static void on_get_label_chunk_response(uint32_t start, uint32_t end); +static uint32_t lde_get_next_label(void); +static bool lde_fec_connected(const struct fec_node *); +static bool lde_fec_outside_mpls_network(const struct fec_node *); +static void lde_check_filter_af(int, struct ldpd_af_conf *, + const char *); + +RB_GENERATE(nbr_tree, lde_nbr, entry, lde_nbr_compare) +RB_GENERATE(lde_map_head, lde_map, entry, lde_map_compare) + +struct ldpd_conf *ldeconf; +struct nbr_tree lde_nbrs = RB_INITIALIZER(&lde_nbrs); + +static struct imsgev *iev_ldpe; +static struct imsgev iev_main_sync_data; +static struct imsgev *iev_main, *iev_main_sync; + +/* lde privileges */ +static zebra_capabilities_t _caps_p [] = +{ + ZCAP_NET_ADMIN +}; + +static struct zebra_privs_t lde_privs = +{ +#if defined(VTY_GROUP) + .vty_group = VTY_GROUP, +#endif + .caps_p = _caps_p, + .cap_num_p = array_size(_caps_p), + .cap_num_i = 0 +}; + +/* List of chunks of labels externally assigned by Zebra */ +static struct list *label_chunk_list; +static struct listnode *current_label_chunk; + +/* Synchronous zclient to request labels */ +static struct zclient *zclient_sync; + +/* SIGINT / SIGTERM handler. */ +static void +sigint(void) +{ + lde_shutdown(); +} + +static struct frr_signal_t lde_signals[] = +{ + { + .signal = SIGHUP, + /* ignore */ + }, + { + .signal = SIGINT, + .handler = &sigint, + }, + { + .signal = SIGTERM, + .handler = &sigint, + }, +}; + +/* label decision engine */ +void +lde(void) +{ +#ifdef HAVE_SETPROCTITLE + setproctitle("label decision engine"); +#endif + ldpd_process = PROC_LDE_ENGINE; + log_procname = log_procnames[PROC_LDE_ENGINE]; + + master = frr_init(); + /* no frr_config_fork() here, allow frr_pthread to create threads */ + frr_is_after_fork = true; + + /* setup signal handler */ + signal_init(master, array_size(lde_signals), lde_signals); + + /* setup pipes and event handlers to the parent process */ + if ((iev_main = calloc(1, sizeof(struct imsgev))) == NULL) + fatal(NULL); + imsg_init(&iev_main->ibuf, LDPD_FD_ASYNC); + iev_main->handler_read = lde_dispatch_parent; + thread_add_read(master, iev_main->handler_read, iev_main, iev_main->ibuf.fd, + &iev_main->ev_read); + iev_main->handler_write = ldp_write_handler; + + memset(&iev_main_sync_data, 0, sizeof(iev_main_sync_data)); + iev_main_sync = &iev_main_sync_data; + imsg_init(&iev_main_sync->ibuf, LDPD_FD_SYNC); + + /* create base configuration */ + ldeconf = config_new_empty(); + + struct thread thread; + while (thread_fetch(master, &thread)) + thread_call(&thread); + + /* NOTREACHED */ + return; +} + +void +lde_init(struct ldpd_init *init) +{ + /* drop privileges */ + lde_privs.user = init->user; + lde_privs.group = init->group; + zprivs_preinit(&lde_privs); + zprivs_init(&lde_privs); + + /* start the LIB garbage collector */ + lde_gc_start_timer(); + + /* Init synchronous zclient and label list */ + frr_zclient_addr(&zclient_addr, &zclient_addr_len, + init->zclient_serv_path); + zclient_sync_init(); +} + +static void +lde_shutdown(void) +{ + /* close pipes */ + if (iev_ldpe) { + msgbuf_clear(&iev_ldpe->ibuf.w); + close(iev_ldpe->ibuf.fd); + iev_ldpe->ibuf.fd = -1; + } + msgbuf_clear(&iev_main->ibuf.w); + close(iev_main->ibuf.fd); + iev_main->ibuf.fd = -1; + msgbuf_clear(&iev_main_sync->ibuf.w); + close(iev_main_sync->ibuf.fd); + iev_main_sync->ibuf.fd = -1; + + lde_gc_stop_timer(); + lde_nbr_clear(); + fec_tree_clear(); + + config_clear(ldeconf); + + if (iev_ldpe) + free(iev_ldpe); + free(iev_main); + + log_info("label decision engine exiting"); + + zlog_fini(); + exit(0); +} + +/* imesg */ +int +lde_imsg_compose_parent(int type, pid_t pid, void *data, uint16_t datalen) +{ + if (iev_main->ibuf.fd == -1) + return (0); + return (imsg_compose_event(iev_main, type, 0, pid, -1, data, datalen)); +} + +void +lde_imsg_compose_parent_sync(int type, pid_t pid, void *data, uint16_t datalen) +{ + if (iev_main_sync->ibuf.fd == -1) + return; + imsg_compose_event(iev_main_sync, type, 0, pid, -1, data, datalen); + imsg_flush(&iev_main_sync->ibuf); +} + +int +lde_imsg_compose_ldpe(int type, uint32_t peerid, pid_t pid, void *data, + uint16_t datalen) +{ + if (iev_ldpe->ibuf.fd == -1) + return (0); + return (imsg_compose_event(iev_ldpe, type, peerid, pid, + -1, data, datalen)); +} + +/* ARGSUSED */ +static void lde_dispatch_imsg(struct thread *thread) +{ + struct imsgev *iev = THREAD_ARG(thread); + struct imsgbuf *ibuf = &iev->ibuf; + struct imsg imsg; + struct lde_nbr *ln; + struct map *map; + struct lde_addr *lde_addr; + struct notify_msg *nm; + ssize_t n; + int shut = 0; + + iev->ev_read = NULL; + + if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN) + fatal("imsg_read error"); + if (n == 0) /* connection closed */ + shut = 1; + + for (;;) { + if ((n = imsg_get(ibuf, &imsg)) == -1) + fatal("lde_dispatch_imsg: imsg_get error"); + if (n == 0) + break; + + switch (imsg.hdr.type) { + case IMSG_LABEL_MAPPING_FULL: + ln = lde_nbr_find(imsg.hdr.peerid); + if (ln == NULL) { + log_debug("%s: cannot find lde neighbor", + __func__); + break; + } + + fec_snap(ln); + break; + case IMSG_LABEL_MAPPING: + case IMSG_LABEL_REQUEST: + case IMSG_LABEL_RELEASE: + case IMSG_LABEL_WITHDRAW: + case IMSG_LABEL_ABORT: + if (imsg.hdr.len - IMSG_HEADER_SIZE != + sizeof(struct map)) + fatalx("lde_dispatch_imsg: wrong imsg len"); + map = imsg.data; + + ln = lde_nbr_find(imsg.hdr.peerid); + if (ln == NULL) { + log_debug("%s: cannot find lde neighbor", + __func__); + break; + } + + switch (imsg.hdr.type) { + case IMSG_LABEL_MAPPING: + lde_check_mapping(map, ln, 1); + break; + case IMSG_LABEL_REQUEST: + lde_check_request(map, ln); + break; + case IMSG_LABEL_RELEASE: + lde_check_release(map, ln); + break; + case IMSG_LABEL_WITHDRAW: + lde_check_withdraw(map, ln); + break; + case IMSG_LABEL_ABORT: + /* not necessary */ + break; + } + break; + case IMSG_ADDRESS_ADD: + if (imsg.hdr.len - IMSG_HEADER_SIZE != + sizeof(struct lde_addr)) + fatalx("lde_dispatch_imsg: wrong imsg len"); + lde_addr = imsg.data; + + ln = lde_nbr_find(imsg.hdr.peerid); + if (ln == NULL) { + log_debug("%s: cannot find lde neighbor", + __func__); + break; + } + if (lde_address_add(ln, lde_addr) < 0) { + log_debug("%s: cannot add address %s, it already exists", __func__, + log_addr(lde_addr->af, &lde_addr->addr)); + } + break; + case IMSG_ADDRESS_DEL: + if (imsg.hdr.len - IMSG_HEADER_SIZE != + sizeof(struct lde_addr)) + fatalx("lde_dispatch_imsg: wrong imsg len"); + lde_addr = imsg.data; + + ln = lde_nbr_find(imsg.hdr.peerid); + if (ln == NULL) { + log_debug("%s: cannot find lde neighbor", + __func__); + break; + } + if (lde_address_del(ln, lde_addr) < 0) { + log_debug("%s: cannot delete address %s, it does not exist", __func__, + log_addr(lde_addr->af, &lde_addr->addr)); + } + break; + case IMSG_NOTIFICATION: + if (imsg.hdr.len - IMSG_HEADER_SIZE != + sizeof(struct notify_msg)) + fatalx("lde_dispatch_imsg: wrong imsg len"); + nm = imsg.data; + + ln = lde_nbr_find(imsg.hdr.peerid); + if (ln == NULL) { + log_debug("%s: cannot find lde neighbor", + __func__); + break; + } + + switch (nm->status_code) { + case S_PW_STATUS: + l2vpn_recv_pw_status(ln, nm); + break; + case S_ENDOFLIB: + /* + * Do nothing for now. Should be useful in + * the future when we implement LDP-IGP + * Synchronization (RFC 5443) and Graceful + * Restart (RFC 3478). + */ + default: + break; + } + break; + case IMSG_NEIGHBOR_UP: + if (imsg.hdr.len - IMSG_HEADER_SIZE != + sizeof(struct lde_nbr)) + fatalx("lde_dispatch_imsg: wrong imsg len"); + + if (lde_nbr_find(imsg.hdr.peerid)) + fatalx("lde_dispatch_imsg: neighbor already exists"); + lde_nbr_new(imsg.hdr.peerid, imsg.data); + break; + case IMSG_NEIGHBOR_DOWN: + lde_nbr_del(lde_nbr_find(imsg.hdr.peerid)); + break; + case IMSG_CTL_SHOW_LIB: + rt_dump(imsg.hdr.pid); + + lde_imsg_compose_ldpe(IMSG_CTL_END, 0, + imsg.hdr.pid, NULL, 0); + break; + case IMSG_CTL_SHOW_L2VPN_PW: + l2vpn_pw_ctl(imsg.hdr.pid); + + lde_imsg_compose_ldpe(IMSG_CTL_END, 0, + imsg.hdr.pid, NULL, 0); + break; + case IMSG_CTL_SHOW_L2VPN_BINDING: + l2vpn_binding_ctl(imsg.hdr.pid); + + lde_imsg_compose_ldpe(IMSG_CTL_END, 0, + imsg.hdr.pid, NULL, 0); + break; + default: + log_debug("%s: unexpected imsg %d", __func__, + imsg.hdr.type); + break; + } + imsg_free(&imsg); + } + if (!shut) + imsg_event_add(iev); + else { + /* this pipe is dead, so remove the event handlers and exit */ + THREAD_OFF(iev->ev_read); + THREAD_OFF(iev->ev_write); + lde_shutdown(); + } +} + +/* ARGSUSED */ +static void lde_dispatch_parent(struct thread *thread) +{ + static struct ldpd_conf *nconf; + struct iface *iface, *niface; + struct tnbr *ntnbr; + struct nbr_params *nnbrp; + static struct l2vpn *l2vpn, *nl2vpn; + struct l2vpn_if *lif, *nlif; + struct l2vpn_pw *pw, *npw; + struct imsg imsg; + struct kif *kif; + struct kroute *kr; + int fd; + struct imsgev *iev = THREAD_ARG(thread); + struct imsgbuf *ibuf = &iev->ibuf; + ssize_t n; + int shut = 0; + struct fec fec; + struct ldp_access *laccess; + struct ldp_rlfa_node *rnode, *rntmp; + struct ldp_rlfa_client *rclient; + struct zapi_rlfa_request *rlfa_req; + struct zapi_rlfa_igp *rlfa_igp; + + iev->ev_read = NULL; + + if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN) + fatal("imsg_read error"); + if (n == 0) /* connection closed */ + shut = 1; + + for (;;) { + if ((n = imsg_get(ibuf, &imsg)) == -1) + fatal("lde_dispatch_parent: imsg_get error"); + if (n == 0) + break; + + switch (imsg.hdr.type) { + case IMSG_IFSTATUS: + if (imsg.hdr.len != IMSG_HEADER_SIZE + + sizeof(struct kif)) + fatalx("IFSTATUS imsg with wrong len"); + kif = imsg.data; + + iface = if_lookup_name(ldeconf, kif->ifname); + if (iface) { + if_update_info(iface, kif); + + /* if up see if any labels need to be updated */ + if (kif->operative) + lde_route_update(iface, AF_UNSPEC); + break; + } + + RB_FOREACH(l2vpn, l2vpn_head, &ldeconf->l2vpn_tree) { + lif = l2vpn_if_find(l2vpn, kif->ifname); + if (lif) { + l2vpn_if_update_info(lif, kif); + break; + } + pw = l2vpn_pw_find(l2vpn, kif->ifname); + if (pw) { + l2vpn_pw_update_info(pw, kif); + break; + } + } + break; + case IMSG_PW_UPDATE: + if (imsg.hdr.len != IMSG_HEADER_SIZE + + sizeof(struct zapi_pw_status)) + fatalx("PW_UPDATE imsg with wrong len"); + + if (l2vpn_pw_status_update(imsg.data) != 0) + log_warnx("%s: error updating PW status", + __func__); + break; + case IMSG_NETWORK_ADD: + case IMSG_NETWORK_UPDATE: + if (imsg.hdr.len != IMSG_HEADER_SIZE + + sizeof(struct kroute)) { + log_warnx("%s: wrong imsg len", __func__); + break; + } + kr = imsg.data; + + switch (kr->af) { + case AF_INET: + fec.type = FEC_TYPE_IPV4; + fec.u.ipv4.prefix = kr->prefix.v4; + fec.u.ipv4.prefixlen = kr->prefixlen; + break; + case AF_INET6: + fec.type = FEC_TYPE_IPV6; + fec.u.ipv6.prefix = kr->prefix.v6; + fec.u.ipv6.prefixlen = kr->prefixlen; + break; + default: + fatalx("lde_dispatch_parent: unknown af"); + } + + switch (imsg.hdr.type) { + case IMSG_NETWORK_ADD: + lde_kernel_insert(&fec, kr->af, &kr->nexthop, + kr->ifindex, kr->route_type, + kr->route_instance, + kr->flags & F_CONNECTED, NULL); + break; + case IMSG_NETWORK_UPDATE: + lde_kernel_update(&fec); + break; + } + break; + case IMSG_SOCKET_IPC: + if (iev_ldpe) { + log_warnx("%s: received unexpected imsg fd to ldpe", __func__); + break; + } + if ((fd = imsg.fd) == -1) { + log_warnx("%s: expected to receive imsg fd to ldpe but didn't receive any", __func__); + break; + } + + if ((iev_ldpe = malloc(sizeof(struct imsgev))) == NULL) + fatal(NULL); + imsg_init(&iev_ldpe->ibuf, fd); + iev_ldpe->handler_read = lde_dispatch_imsg; + thread_add_read(master, iev_ldpe->handler_read, iev_ldpe, iev_ldpe->ibuf.fd, + &iev_ldpe->ev_read); + iev_ldpe->handler_write = ldp_write_handler; + iev_ldpe->ev_write = NULL; + break; + case IMSG_INIT: + if (imsg.hdr.len != IMSG_HEADER_SIZE + + sizeof(struct ldpd_init)) + fatalx("INIT imsg with wrong len"); + + memcpy(&init, imsg.data, sizeof(init)); + lde_init(&init); + break; + case IMSG_AGENTX_ENABLED: + ldp_agentx_enabled(); + break; + case IMSG_RECONF_CONF: + if ((nconf = malloc(sizeof(struct ldpd_conf))) == + NULL) + fatal(NULL); + memcpy(nconf, imsg.data, sizeof(struct ldpd_conf)); + + RB_INIT(iface_head, &nconf->iface_tree); + RB_INIT(tnbr_head, &nconf->tnbr_tree); + RB_INIT(nbrp_head, &nconf->nbrp_tree); + RB_INIT(l2vpn_head, &nconf->l2vpn_tree); + break; + case IMSG_RECONF_IFACE: + if ((niface = malloc(sizeof(struct iface))) == NULL) + fatal(NULL); + memcpy(niface, imsg.data, sizeof(struct iface)); + + RB_INSERT(iface_head, &nconf->iface_tree, niface); + break; + case IMSG_RECONF_TNBR: + if ((ntnbr = malloc(sizeof(struct tnbr))) == NULL) + fatal(NULL); + memcpy(ntnbr, imsg.data, sizeof(struct tnbr)); + + RB_INSERT(tnbr_head, &nconf->tnbr_tree, ntnbr); + break; + case IMSG_RECONF_NBRP: + if ((nnbrp = malloc(sizeof(struct nbr_params))) == NULL) + fatal(NULL); + memcpy(nnbrp, imsg.data, sizeof(struct nbr_params)); + + RB_INSERT(nbrp_head, &nconf->nbrp_tree, nnbrp); + break; + case IMSG_RECONF_L2VPN: + if ((nl2vpn = malloc(sizeof(struct l2vpn))) == NULL) + fatal(NULL); + memcpy(nl2vpn, imsg.data, sizeof(struct l2vpn)); + + RB_INIT(l2vpn_if_head, &nl2vpn->if_tree); + RB_INIT(l2vpn_pw_head, &nl2vpn->pw_tree); + RB_INIT(l2vpn_pw_head, &nl2vpn->pw_inactive_tree); + + RB_INSERT(l2vpn_head, &nconf->l2vpn_tree, nl2vpn); + break; + case IMSG_RECONF_L2VPN_IF: + if ((nlif = malloc(sizeof(struct l2vpn_if))) == NULL) + fatal(NULL); + memcpy(nlif, imsg.data, sizeof(struct l2vpn_if)); + + RB_INSERT(l2vpn_if_head, &nl2vpn->if_tree, nlif); + break; + case IMSG_RECONF_L2VPN_PW: + if ((npw = malloc(sizeof(struct l2vpn_pw))) == NULL) + fatal(NULL); + memcpy(npw, imsg.data, sizeof(struct l2vpn_pw)); + + RB_INSERT(l2vpn_pw_head, &nl2vpn->pw_tree, npw); + break; + case IMSG_RECONF_L2VPN_IPW: + if ((npw = malloc(sizeof(struct l2vpn_pw))) == NULL) + fatal(NULL); + memcpy(npw, imsg.data, sizeof(struct l2vpn_pw)); + + RB_INSERT(l2vpn_pw_head, &nl2vpn->pw_inactive_tree, npw); + break; + case IMSG_RECONF_END: + merge_config(ldeconf, nconf); + ldp_clear_config(nconf); + nconf = NULL; + break; + case IMSG_DEBUG_UPDATE: + if (imsg.hdr.len != IMSG_HEADER_SIZE + + sizeof(ldp_debug)) { + log_warnx("%s: wrong imsg len", __func__); + break; + } + memcpy(&ldp_debug, imsg.data, sizeof(ldp_debug)); + break; + case IMSG_FILTER_UPDATE: + if (imsg.hdr.len != IMSG_HEADER_SIZE + + sizeof(struct ldp_access)) { + log_warnx("%s: wrong imsg len", __func__); + break; + } + laccess = imsg.data; + lde_check_filter_af(AF_INET, &ldeconf->ipv4, + laccess->name); + lde_check_filter_af(AF_INET6, &ldeconf->ipv6, + laccess->name); + break; + case IMSG_RLFA_REG: + if (imsg.hdr.len != IMSG_HEADER_SIZE + + sizeof(struct zapi_rlfa_request)) { + log_warnx("%s: wrong imsg len", __func__); + break; + } + rlfa_req = imsg.data; + rnode = rlfa_node_find(&rlfa_req->destination, + rlfa_req->pq_address); + if (!rnode) + rnode = rlfa_node_new(&rlfa_req->destination, + rlfa_req->pq_address); + rclient = rlfa_client_find(rnode, &rlfa_req->igp); + if (rclient) + /* RLFA already registered - do nothing */ + break; + rclient = rlfa_client_new(rnode, &rlfa_req->igp); + lde_rlfa_check(rclient); + break; + case IMSG_RLFA_UNREG_ALL: + if (imsg.hdr.len != IMSG_HEADER_SIZE + + sizeof(struct zapi_rlfa_igp)) { + log_warnx("%s: wrong imsg len", __func__); + break; + } + rlfa_igp = imsg.data; + + RB_FOREACH_SAFE (rnode, ldp_rlfa_node_head, + &rlfa_node_tree, rntmp) { + rclient = rlfa_client_find(rnode, rlfa_igp); + if (!rclient) + continue; + + rlfa_client_del(rclient); + } + break; + default: + log_debug("%s: unexpected imsg %d", __func__, + imsg.hdr.type); + break; + } + imsg_free(&imsg); + } + if (!shut) + imsg_event_add(iev); + else { + /* this pipe is dead, so remove the event handlers and exit */ + THREAD_OFF(iev->ev_read); + THREAD_OFF(iev->ev_write); + lde_shutdown(); + } +} + +int +lde_acl_check(char *acl_name, int af, union ldpd_addr *addr, uint8_t prefixlen) +{ + return ldp_acl_request(iev_main_sync, acl_name, af, addr, prefixlen); +} + +static bool lde_fec_connected(const struct fec_node *fn) +{ + struct fec_nh *fnh; + + LIST_FOREACH(fnh, &fn->nexthops, entry) + if (fnh->flags & F_FEC_NH_CONNECTED) + return true; + + return false; +} + +static bool lde_fec_outside_mpls_network(const struct fec_node *fn) +{ + struct fec_nh *fnh; + + LIST_FOREACH(fnh, &fn->nexthops, entry) + if (!(fnh->flags & F_FEC_NH_NO_LDP)) + return false; + + return true; +} + +uint32_t +lde_update_label(struct fec_node *fn) +{ + + /* should we allocate a label for this fec? */ + switch (fn->fec.type) { + case FEC_TYPE_IPV4: + if ((ldeconf->ipv4.flags & F_LDPD_AF_ALLOCHOSTONLY) + && fn->fec.u.ipv4.prefixlen != IPV4_MAX_BITLEN) + return (NO_LABEL); + if (lde_acl_check(ldeconf->ipv4.acl_label_allocate_for, + AF_INET, (union ldpd_addr *)&fn->fec.u.ipv4.prefix, + fn->fec.u.ipv4.prefixlen) != FILTER_PERMIT) + return (NO_LABEL); + break; + case FEC_TYPE_IPV6: + if ((ldeconf->ipv6.flags & F_LDPD_AF_ALLOCHOSTONLY) + && fn->fec.u.ipv6.prefixlen != IPV6_MAX_BITLEN) + return (NO_LABEL); + if (lde_acl_check(ldeconf->ipv6.acl_label_allocate_for, + AF_INET6, (union ldpd_addr *)&fn->fec.u.ipv6.prefix, + fn->fec.u.ipv6.prefixlen) != FILTER_PERMIT) + return (NO_LABEL); + break; + default: + break; + } + + /* + * If connected interface act as egress for fec. + * If LDP is not configured on an interface but there + * are other NHs with interfaces configured with LDP + * then don't act as an egress for the fec, otherwise + * act as an egress for the fec + */ + if (lde_fec_connected(fn) || lde_fec_outside_mpls_network(fn)) { + /* choose implicit or explicit-null depending on configuration */ + switch (fn->fec.type) { + case FEC_TYPE_IPV4: + if (!(ldeconf->ipv4.flags & F_LDPD_AF_EXPNULL)) + return (MPLS_LABEL_IMPLICIT_NULL); + if (lde_acl_check(ldeconf->ipv4.acl_label_expnull_for, + AF_INET, (union ldpd_addr *)&fn->fec.u.ipv4.prefix, + fn->fec.u.ipv4.prefixlen) != FILTER_PERMIT) + return (MPLS_LABEL_IMPLICIT_NULL); + return MPLS_LABEL_IPV4_EXPLICIT_NULL; + case FEC_TYPE_IPV6: + if (!(ldeconf->ipv6.flags & F_LDPD_AF_EXPNULL)) + return (MPLS_LABEL_IMPLICIT_NULL); + if (lde_acl_check(ldeconf->ipv6.acl_label_expnull_for, + AF_INET6, (union ldpd_addr *)&fn->fec.u.ipv6.prefix, + fn->fec.u.ipv6.prefixlen) != FILTER_PERMIT) + return (MPLS_LABEL_IMPLICIT_NULL); + return MPLS_LABEL_IPV6_EXPLICIT_NULL; + default: + break; + } + } + + /* preserve current label if there's no need to update it */ + if (fn->local_label != NO_LABEL && + fn->local_label > MPLS_LABEL_RESERVED_MAX) + return (fn->local_label); + + return (lde_get_next_label()); +} + +void +lde_send_change_klabel(struct fec_node *fn, struct fec_nh *fnh) +{ + struct kroute kr; + struct zapi_pw zpw; + struct l2vpn_pw *pw; + + /* + * Ordered Control: don't program label into HW until a + * labelmap msg has been received from upstream router + */ + if (fnh->flags & F_FEC_NH_DEFER) + return; + + switch (fn->fec.type) { + case FEC_TYPE_IPV4: + memset(&kr, 0, sizeof(kr)); + kr.af = AF_INET; + kr.prefix.v4 = fn->fec.u.ipv4.prefix; + kr.prefixlen = fn->fec.u.ipv4.prefixlen; + kr.nexthop.v4 = fnh->nexthop.v4; + kr.ifindex = fnh->ifindex; + kr.local_label = fn->local_label; + kr.remote_label = fnh->remote_label; + kr.route_type = fnh->route_type; + kr.route_instance = fnh->route_instance; + lde_imsg_compose_parent(IMSG_KLABEL_CHANGE, 0, &kr, + sizeof(kr)); + break; + case FEC_TYPE_IPV6: + memset(&kr, 0, sizeof(kr)); + kr.af = AF_INET6; + kr.prefix.v6 = fn->fec.u.ipv6.prefix; + kr.prefixlen = fn->fec.u.ipv6.prefixlen; + kr.nexthop.v6 = fnh->nexthop.v6; + kr.ifindex = fnh->ifindex; + kr.local_label = fn->local_label; + kr.remote_label = fnh->remote_label; + kr.route_type = fnh->route_type; + kr.route_instance = fnh->route_instance; + + lde_imsg_compose_parent(IMSG_KLABEL_CHANGE, 0, &kr, + sizeof(kr)); + break; + case FEC_TYPE_PWID: + pw = (struct l2vpn_pw *) fn->data; + if (!pw || fn->local_label == NO_LABEL || + fnh->remote_label == NO_LABEL) + return; + + pw->enabled = true; + pw2zpw(pw, &zpw); + zpw.local_label = fn->local_label; + zpw.remote_label = fnh->remote_label; + lde_imsg_compose_parent(IMSG_KPW_SET, 0, &zpw, sizeof(zpw)); + break; + } +} + +void +lde_send_delete_klabel(struct fec_node *fn, struct fec_nh *fnh) +{ + struct kroute kr; + struct zapi_pw zpw; + struct l2vpn_pw *pw; + + switch (fn->fec.type) { + case FEC_TYPE_IPV4: + memset(&kr, 0, sizeof(kr)); + kr.af = AF_INET; + kr.prefix.v4 = fn->fec.u.ipv4.prefix; + kr.prefixlen = fn->fec.u.ipv4.prefixlen; + kr.nexthop.v4 = fnh->nexthop.v4; + kr.ifindex = fnh->ifindex; + kr.local_label = fn->local_label; + kr.remote_label = fnh->remote_label; + kr.route_type = fnh->route_type; + kr.route_instance = fnh->route_instance; + + lde_imsg_compose_parent(IMSG_KLABEL_DELETE, 0, &kr, + sizeof(kr)); + break; + case FEC_TYPE_IPV6: + memset(&kr, 0, sizeof(kr)); + kr.af = AF_INET6; + kr.prefix.v6 = fn->fec.u.ipv6.prefix; + kr.prefixlen = fn->fec.u.ipv6.prefixlen; + kr.nexthop.v6 = fnh->nexthop.v6; + kr.ifindex = fnh->ifindex; + kr.local_label = fn->local_label; + kr.remote_label = fnh->remote_label; + kr.route_type = fnh->route_type; + kr.route_instance = fnh->route_instance; + + lde_imsg_compose_parent(IMSG_KLABEL_DELETE, 0, &kr, + sizeof(kr)); + break; + case FEC_TYPE_PWID: + pw = (struct l2vpn_pw *) fn->data; + if (!pw) + return; + + pw->enabled = false; + pw2zpw(pw, &zpw); + zpw.local_label = fn->local_label; + zpw.remote_label = fnh->remote_label; + lde_imsg_compose_parent(IMSG_KPW_UNSET, 0, &zpw, sizeof(zpw)); + break; + } +} + +void +lde_fec2prefix(const struct fec *fec, struct prefix *prefix) +{ + memset(prefix, 0, sizeof(*prefix)); + switch (fec->type) { + case FEC_TYPE_IPV4: + prefix->family = AF_INET; + prefix->u.prefix4 = fec->u.ipv4.prefix; + prefix->prefixlen = fec->u.ipv4.prefixlen; + break; + case FEC_TYPE_IPV6: + prefix->family = AF_INET6; + prefix->u.prefix6 = fec->u.ipv6.prefix; + prefix->prefixlen = fec->u.ipv6.prefixlen; + break; + default: + prefix->family = AF_UNSPEC; + break; + } +} + +void +lde_prefix2fec(const struct prefix *prefix, struct fec *fec) +{ + memset(fec, 0, sizeof(*fec)); + switch (prefix->family) { + case AF_INET: + fec->type = FEC_TYPE_IPV4; + fec->u.ipv4.prefix = prefix->u.prefix4; + fec->u.ipv4.prefixlen = prefix->prefixlen; + break; + case AF_INET6: + fec->type = FEC_TYPE_IPV6; + fec->u.ipv6.prefix = prefix->u.prefix6; + fec->u.ipv6.prefixlen = prefix->prefixlen; + break; + default: + fatalx("lde_prefix2fec: unknown af"); + break; + } +} + +void +lde_fec2map(struct fec *fec, struct map *map) +{ + memset(map, 0, sizeof(*map)); + + switch (fec->type) { + case FEC_TYPE_IPV4: + map->type = MAP_TYPE_PREFIX; + map->fec.prefix.af = AF_INET; + map->fec.prefix.prefix.v4 = fec->u.ipv4.prefix; + map->fec.prefix.prefixlen = fec->u.ipv4.prefixlen; + break; + case FEC_TYPE_IPV6: + map->type = MAP_TYPE_PREFIX; + map->fec.prefix.af = AF_INET6; + map->fec.prefix.prefix.v6 = fec->u.ipv6.prefix; + map->fec.prefix.prefixlen = fec->u.ipv6.prefixlen; + break; + case FEC_TYPE_PWID: + map->type = MAP_TYPE_PWID; + map->fec.pwid.type = fec->u.pwid.type; + map->fec.pwid.group_id = 0; + map->flags |= F_MAP_PW_ID; + map->fec.pwid.pwid = fec->u.pwid.pwid; + break; + } +} + +void +lde_map2fec(struct map *map, struct in_addr lsr_id, struct fec *fec) +{ + memset(fec, 0, sizeof(*fec)); + + switch (map->type) { + case MAP_TYPE_PREFIX: + switch (map->fec.prefix.af) { + case AF_INET: + fec->type = FEC_TYPE_IPV4; + fec->u.ipv4.prefix = map->fec.prefix.prefix.v4; + fec->u.ipv4.prefixlen = map->fec.prefix.prefixlen; + break; + case AF_INET6: + fec->type = FEC_TYPE_IPV6; + fec->u.ipv6.prefix = map->fec.prefix.prefix.v6; + fec->u.ipv6.prefixlen = map->fec.prefix.prefixlen; + break; + default: + fatalx("lde_map2fec: unknown af"); + break; + } + break; + case MAP_TYPE_PWID: + fec->type = FEC_TYPE_PWID; + fec->u.pwid.type = map->fec.pwid.type; + fec->u.pwid.pwid = map->fec.pwid.pwid; + fec->u.pwid.lsr_id = lsr_id; + break; + } +} + +void +lde_send_labelmapping(struct lde_nbr *ln, struct fec_node *fn, int single) +{ + struct lde_wdraw *lw; + struct lde_map *me; + struct lde_req *lre; + struct map map; + struct l2vpn_pw *pw; + struct fec_nh *fnh; + bool allow = false; + + /* + * Ordered Control: do not send a labelmap msg until + * a labelmap message is received from downstream router + * and don't send labelmap back to downstream router + */ + if (ldeconf->flags & F_LDPD_ORDERED_CONTROL) { + LIST_FOREACH(fnh, &fn->nexthops, entry) { + if (fnh->flags & F_FEC_NH_DEFER) + continue; + + if (lde_address_find(ln, fnh->af, &fnh->nexthop)) + return; + allow = true; + break; + } + if (!allow) + return; + } + + /* + * We shouldn't send a new label mapping if we have a pending + * label release to receive. In this case, schedule to send a + * label mapping as soon as a label release is received. + */ + lw = (struct lde_wdraw *)fec_find(&ln->sent_wdraw, &fn->fec); + if (lw) { + if (!fec_find(&ln->sent_map_pending, &fn->fec)) { + debug_evt("%s: FEC %s: scheduling to send label mapping later (waiting for pending label release)", + __func__, log_fec(&fn->fec)); + lde_map_pending_add(ln, fn); + } + return; + } + + /* + * This function skips SL.1 - 3 and SL.9 - 14 because the label + * allocation is done way earlier (because of the merging nature of + * ldpd). + */ + + lde_fec2map(&fn->fec, &map); + switch (fn->fec.type) { + case FEC_TYPE_IPV4: + if (!ln->v4_enabled) + return; + if (lde_acl_check(ldeconf->ipv4.acl_label_advertise_to, + AF_INET, (union ldpd_addr *)&ln->id, 32) != FILTER_PERMIT) + return; + if (lde_acl_check(ldeconf->ipv4.acl_label_advertise_for, + AF_INET, (union ldpd_addr *)&fn->fec.u.ipv4.prefix, + fn->fec.u.ipv4.prefixlen) != FILTER_PERMIT) + return; + break; + case FEC_TYPE_IPV6: + if (!ln->v6_enabled) + return; + if (lde_acl_check(ldeconf->ipv6.acl_label_advertise_to, + AF_INET, (union ldpd_addr *)&ln->id, 32) != FILTER_PERMIT) + return; + if (lde_acl_check(ldeconf->ipv6.acl_label_advertise_for, + AF_INET6, (union ldpd_addr *)&fn->fec.u.ipv6.prefix, + fn->fec.u.ipv6.prefixlen) != FILTER_PERMIT) + return; + break; + case FEC_TYPE_PWID: + pw = (struct l2vpn_pw *) fn->data; + if (pw == NULL || pw->lsr_id.s_addr != ln->id.s_addr) + /* not the remote end of the pseudowire */ + return; + + map.flags |= F_MAP_PW_IFMTU; + map.fec.pwid.ifmtu = pw->l2vpn->mtu; + if (pw->flags & F_PW_CWORD) + map.flags |= F_MAP_PW_CWORD; + if (pw->flags & F_PW_STATUSTLV) { + map.flags |= F_MAP_PW_STATUS; + map.pw_status = pw->local_status; + } + break; + } + map.label = fn->local_label; + + /* SL.6: is there a pending request for this mapping? */ + lre = (struct lde_req *)fec_find(&ln->recv_req, &fn->fec); + if (lre) { + /* set label request msg id in the mapping response. */ + map.requestid = lre->msg_id; + map.flags = F_MAP_REQ_ID; + + /* SL.7: delete record of pending request */ + lde_req_del(ln, lre, 0); + } + + /* SL.4: send label mapping */ + lde_imsg_compose_ldpe(IMSG_MAPPING_ADD, ln->peerid, 0, + &map, sizeof(map)); + if (single) + lde_imsg_compose_ldpe(IMSG_MAPPING_ADD_END, ln->peerid, 0, + NULL, 0); + + /* SL.5: record sent label mapping */ + me = (struct lde_map *)fec_find(&ln->sent_map, &fn->fec); + if (me == NULL) + me = lde_map_add(ln, fn, 1); + me->map = map; +} + +void +lde_send_labelwithdraw(struct lde_nbr *ln, struct fec_node *fn, + struct map *wcard, struct status_tlv *st) +{ + struct lde_wdraw *lw; + struct map map; + struct fec *f; + struct l2vpn_pw *pw; + + if (fn) { + lde_fec2map(&fn->fec, &map); + switch (fn->fec.type) { + case FEC_TYPE_IPV4: + if (!ln->v4_enabled) + return; + break; + case FEC_TYPE_IPV6: + if (!ln->v6_enabled) + return; + break; + case FEC_TYPE_PWID: + pw = (struct l2vpn_pw *) fn->data; + if (pw == NULL || pw->lsr_id.s_addr != ln->id.s_addr) + /* not the remote end of the pseudowire */ + return; + + if (pw->flags & F_PW_CWORD) + map.flags |= F_MAP_PW_CWORD; + break; + } + map.label = fn->local_label; + } else + memcpy(&map, wcard, sizeof(map)); + + if (st) { + map.st.status_code = st->status_code; + map.st.msg_id = st->msg_id; + map.st.msg_type = st->msg_type; + map.flags |= F_MAP_STATUS; + } + + /* SWd.1: send label withdraw. */ + lde_imsg_compose_ldpe(IMSG_WITHDRAW_ADD, ln->peerid, 0, + &map, sizeof(map)); + lde_imsg_compose_ldpe(IMSG_WITHDRAW_ADD_END, ln->peerid, 0, NULL, 0); + + /* SWd.2: record label withdraw. */ + if (fn) { + lw = (struct lde_wdraw *)fec_find(&ln->sent_wdraw, &fn->fec); + if (lw == NULL) + lw = lde_wdraw_add(ln, fn); + lw->label = map.label; + } else { + struct lde_map *me; + + RB_FOREACH(f, fec_tree, &ft) { + fn = (struct fec_node *)f; + me = (struct lde_map *)fec_find(&ln->sent_map, &fn->fec); + if (lde_wildcard_apply(wcard, &fn->fec, me) == 0) + continue; + + lw = (struct lde_wdraw *)fec_find(&ln->sent_wdraw, + &fn->fec); + if (lw == NULL) + lw = lde_wdraw_add(ln, fn); + lw->label = map.label; + } + } +} + +void +lde_send_labelwithdraw_wcard(struct lde_nbr *ln, uint32_t label) +{ + struct map wcard; + + memset(&wcard, 0, sizeof(wcard)); + wcard.type = MAP_TYPE_WILDCARD; + wcard.label = label; + lde_send_labelwithdraw(ln, NULL, &wcard, NULL); +} + +void +lde_send_labelwithdraw_twcard_prefix(struct lde_nbr *ln, uint16_t af, + uint32_t label) +{ + struct map wcard; + + memset(&wcard, 0, sizeof(wcard)); + wcard.type = MAP_TYPE_TYPED_WCARD; + wcard.fec.twcard.type = MAP_TYPE_PREFIX; + wcard.fec.twcard.u.prefix_af = af; + wcard.label = label; + lde_send_labelwithdraw(ln, NULL, &wcard, NULL); +} + +void +lde_send_labelwithdraw_twcard_pwid(struct lde_nbr *ln, uint16_t pw_type, + uint32_t label) +{ + struct map wcard; + + memset(&wcard, 0, sizeof(wcard)); + wcard.type = MAP_TYPE_TYPED_WCARD; + wcard.fec.twcard.type = MAP_TYPE_PWID; + wcard.fec.twcard.u.pw_type = pw_type; + wcard.label = label; + lde_send_labelwithdraw(ln, NULL, &wcard, NULL); +} + +void +lde_send_labelwithdraw_pwid_wcard(struct lde_nbr *ln, uint16_t pw_type, + uint32_t group_id) +{ + struct map wcard; + + memset(&wcard, 0, sizeof(wcard)); + wcard.type = MAP_TYPE_PWID; + wcard.fec.pwid.type = pw_type; + wcard.fec.pwid.group_id = group_id; + /* we can not append a Label TLV when using PWid group wildcards. */ + wcard.label = NO_LABEL; + lde_send_labelwithdraw(ln, NULL, &wcard, NULL); +} + +void +lde_send_labelrelease(struct lde_nbr *ln, struct fec_node *fn, + struct map *wcard, uint32_t label) +{ + struct map map; + struct l2vpn_pw *pw; + + if (fn) { + lde_fec2map(&fn->fec, &map); + switch (fn->fec.type) { + case FEC_TYPE_IPV4: + if (!ln->v4_enabled) + return; + break; + case FEC_TYPE_IPV6: + if (!ln->v6_enabled) + return; + break; + case FEC_TYPE_PWID: + pw = (struct l2vpn_pw *) fn->data; + if (pw == NULL || pw->lsr_id.s_addr != ln->id.s_addr) + /* not the remote end of the pseudowire */ + return; + + if (pw->flags & F_PW_CWORD) + map.flags |= F_MAP_PW_CWORD; + break; + } + } else + memcpy(&map, wcard, sizeof(map)); + map.label = label; + + lde_imsg_compose_ldpe(IMSG_RELEASE_ADD, ln->peerid, 0, + &map, sizeof(map)); + lde_imsg_compose_ldpe(IMSG_RELEASE_ADD_END, ln->peerid, 0, NULL, 0); +} + +void +lde_send_labelrequest(struct lde_nbr *ln, struct fec_node *fn, + struct map *wcard, int single) +{ + struct map map; + struct fec *f; + struct lde_req *lre; + + if (fn) { + lde_fec2map(&fn->fec, &map); + switch (fn->fec.type) { + case FEC_TYPE_IPV4: + if (!ln->v4_enabled) + return; + break; + case FEC_TYPE_IPV6: + if (!ln->v6_enabled) + return; + break; + default: + fatalx("lde_send_labelrequest: unknown af"); + } + } else + memcpy(&map, wcard, sizeof(map)); + + map.label = NO_LABEL; + + if (fn) { + /* SLR1.1: has label request for FEC been previously sent + * and still outstanding just return, + */ + lre = (struct lde_req *)fec_find(&ln->sent_req, &fn->fec); + if (lre == NULL) { + /* SLRq.3: send label request */ + lde_imsg_compose_ldpe(IMSG_REQUEST_ADD, ln->peerid, 0, + &map, sizeof(map)); + if (single) + lde_imsg_compose_ldpe(IMSG_REQUEST_ADD_END, + ln->peerid, 0, NULL, 0); + + /* SLRq.4: record sent request */ + lde_req_add(ln, &fn->fec, 1); + } + } else { + /* if Wilcard just send label request */ + /* SLRq.3: send label request */ + lde_imsg_compose_ldpe(IMSG_REQUEST_ADD, + ln->peerid, 0, &map, sizeof(map)); + if (single) + lde_imsg_compose_ldpe(IMSG_REQUEST_ADD_END, + ln->peerid, 0, NULL, 0); + + /* SLRq.4: record sent request */ + RB_FOREACH(f, fec_tree, &ft) { + fn = (struct fec_node *)f; + lre = (struct lde_req *)fec_find(&ln->sent_req, &fn->fec); + if (lde_wildcard_apply(wcard, &fn->fec, NULL) == 0) + continue; + if (lre == NULL) + lde_req_add(ln, f, 1); + } + } +} + +void +lde_send_labelrequest_wcard(struct lde_nbr *ln, uint16_t af) +{ + struct map wcard; + + memset(&wcard, 0, sizeof(wcard)); + wcard.type = MAP_TYPE_TYPED_WCARD; + wcard.fec.twcard.type = MAP_TYPE_PREFIX; + wcard.fec.twcard.u.prefix_af = af; + lde_send_labelrequest(ln, NULL, &wcard, 1); +} + +void +lde_send_notification(struct lde_nbr *ln, uint32_t status_code, uint32_t msg_id, + uint16_t msg_type) +{ + struct notify_msg nm; + + memset(&nm, 0, sizeof(nm)); + nm.status_code = status_code; + /* 'msg_id' and 'msg_type' should be in network byte order */ + nm.msg_id = msg_id; + nm.msg_type = msg_type; + + lde_imsg_compose_ldpe(IMSG_NOTIFICATION_SEND, ln->peerid, 0, + &nm, sizeof(nm)); +} + +void +lde_send_notification_eol_prefix(struct lde_nbr *ln, int af) +{ + struct notify_msg nm; + + memset(&nm, 0, sizeof(nm)); + nm.status_code = S_ENDOFLIB; + nm.fec.type = MAP_TYPE_TYPED_WCARD; + nm.fec.fec.twcard.type = MAP_TYPE_PREFIX; + nm.fec.fec.twcard.u.prefix_af = af; + nm.flags |= F_NOTIF_FEC; + + lde_imsg_compose_ldpe(IMSG_NOTIFICATION_SEND, ln->peerid, 0, + &nm, sizeof(nm)); +} + +void +lde_send_notification_eol_pwid(struct lde_nbr *ln, uint16_t pw_type) +{ + struct notify_msg nm; + + memset(&nm, 0, sizeof(nm)); + nm.status_code = S_ENDOFLIB; + nm.fec.type = MAP_TYPE_TYPED_WCARD; + nm.fec.fec.twcard.type = MAP_TYPE_PWID; + nm.fec.fec.twcard.u.pw_type = pw_type; + nm.flags |= F_NOTIF_FEC; + + lde_imsg_compose_ldpe(IMSG_NOTIFICATION_SEND, ln->peerid, 0, + &nm, sizeof(nm)); +} + +static __inline int +lde_nbr_compare(const struct lde_nbr *a, const struct lde_nbr *b) +{ + return (a->peerid - b->peerid); +} + +static struct lde_nbr * +lde_nbr_new(uint32_t peerid, struct lde_nbr *new) +{ + struct lde_nbr *ln; + + if ((ln = calloc(1, sizeof(*ln))) == NULL) + fatal(__func__); + + ln->id = new->id; + ln->v4_enabled = new->v4_enabled; + ln->v6_enabled = new->v6_enabled; + ln->flags = new->flags; + ln->peerid = peerid; + fec_init(&ln->recv_map); + fec_init(&ln->sent_map); + fec_init(&ln->sent_map_pending); + fec_init(&ln->recv_req); + fec_init(&ln->sent_req); + fec_init(&ln->sent_wdraw); + + TAILQ_INIT(&ln->addr_list); + + if (RB_INSERT(nbr_tree, &lde_nbrs, ln) != NULL) + fatalx("lde_nbr_new: RB_INSERT failed"); + + return (ln); +} + +static void +lde_nbr_del(struct lde_nbr *ln) +{ + struct fec *f; + struct fec_node *fn; + struct fec_nh *fnh; + struct l2vpn_pw *pw; + struct lde_nbr *lnbr; + + if (ln == NULL) + return; + + /* uninstall received mappings */ + RB_FOREACH(f, fec_tree, &ft) { + fn = (struct fec_node *)f; + + /* Update RLFA clients. */ + lde_rlfa_update_clients(f, ln, MPLS_INVALID_LABEL); + + LIST_FOREACH(fnh, &fn->nexthops, entry) { + switch (f->type) { + case FEC_TYPE_IPV4: + case FEC_TYPE_IPV6: + if (!lde_address_find(ln, fnh->af, + &fnh->nexthop)) + continue; + + /* + * Ordered Control: must mark any non-connected + * NH to wait until we receive a labelmap msg + * before installing in kernel and sending to + * peer, must do this as NHs are not removed + * when lsps go down. Also send label withdraw + * to other neighbors for all fecs from neighbor + * going down + */ + if (ldeconf->flags & F_LDPD_ORDERED_CONTROL) { + fnh->flags |= F_FEC_NH_DEFER; + + RB_FOREACH(lnbr, nbr_tree, &lde_nbrs) { + if (ln->peerid == lnbr->peerid) + continue; + lde_send_labelwithdraw(lnbr, fn, NULL, NULL); + } + } + break; + case FEC_TYPE_PWID: + if (f->u.pwid.lsr_id.s_addr != ln->id.s_addr) + continue; + pw = (struct l2vpn_pw *) fn->data; + if (pw) { + pw->reason = F_PW_NO_REMOTE_LABEL; + l2vpn_pw_reset(pw); + } + break; + default: + break; + } + + lde_send_delete_klabel(fn, fnh); + fnh->remote_label = NO_LABEL; + } + } + + lde_address_list_free(ln); + + fec_clear(&ln->recv_map, lde_map_free); + fec_clear(&ln->sent_map, lde_map_free); + fec_clear(&ln->sent_map_pending, free); + fec_clear(&ln->recv_req, free); + fec_clear(&ln->sent_req, free); + fec_clear(&ln->sent_wdraw, free); + + RB_REMOVE(nbr_tree, &lde_nbrs, ln); + + free(ln); +} + +static struct lde_nbr * +lde_nbr_find(uint32_t peerid) +{ + struct lde_nbr ln; + + ln.peerid = peerid; + + return (RB_FIND(nbr_tree, &lde_nbrs, &ln)); +} + +struct lde_nbr * +lde_nbr_find_by_lsrid(struct in_addr addr) +{ + struct lde_nbr *ln; + + RB_FOREACH(ln, nbr_tree, &lde_nbrs) + if (ln->id.s_addr == addr.s_addr) + return (ln); + + return (NULL); +} + +struct lde_nbr * +lde_nbr_find_by_addr(int af, union ldpd_addr *addr) +{ + struct lde_nbr *ln; + + RB_FOREACH(ln, nbr_tree, &lde_nbrs) + if (lde_address_find(ln, af, addr) != NULL) + return (ln); + + return (NULL); +} + +static void +lde_nbr_clear(void) +{ + struct lde_nbr *ln; + + while (!RB_EMPTY(nbr_tree, &lde_nbrs)) { + ln = RB_ROOT(nbr_tree, &lde_nbrs); + + lde_nbr_del(ln); + } +} + +static void +lde_nbr_addr_update(struct lde_nbr *ln, struct lde_addr *lde_addr, int removed) +{ + struct fec *fec; + struct fec_node *fn; + struct fec_nh *fnh; + struct lde_map *me; + + RB_FOREACH(fec, fec_tree, &ln->recv_map) { + switch (fec->type) { + case FEC_TYPE_IPV4: + if (lde_addr->af != AF_INET) + continue; + break; + case FEC_TYPE_IPV6: + if (lde_addr->af != AF_INET6) + continue; + break; + default: + continue; + } + + fn = (struct fec_node *)fec_find(&ft, fec); + if (fn == NULL) + /* shouldn't happen */ + continue; + + LIST_FOREACH(fnh, &fn->nexthops, entry) { + if (ldp_addrcmp(fnh->af, &fnh->nexthop, + &lde_addr->addr)) + continue; + + if (removed) { + lde_send_delete_klabel(fn, fnh); + fnh->remote_label = NO_LABEL; + } else { + me = (struct lde_map *)fec; + fnh->remote_label = me->map.label; + lde_send_change_klabel(fn, fnh); + } + break; + } + } +} + +void +lde_allow_broken_lsp_update(int new_config) +{ + struct fec_node *fn; + struct fec_nh *fnh; + struct fec *f; + + RB_FOREACH(f, fec_tree, &ft) { + fn = (struct fec_node *)f; + + LIST_FOREACH(fnh, &fn->nexthops, entry) { + /* allow-broken-lsp config is changing so + * we need to reprogram labeled routes to + * have proper top-level label + */ + if (!(new_config & F_LDPD_ALLOW_BROKEN_LSP)) + lde_send_delete_klabel(fn, fnh); + + if (fn->local_label != NO_LABEL) + lde_send_change_klabel(fn, fnh); + } + } +} + +static __inline int +lde_map_compare(const struct lde_map *a, const struct lde_map *b) +{ + return (ldp_addrcmp(AF_INET, (union ldpd_addr *)&a->nexthop->id, + (union ldpd_addr *)&b->nexthop->id)); +} + +struct lde_map * +lde_map_add(struct lde_nbr *ln, struct fec_node *fn, int sent) +{ + struct lde_map *me; + + me = calloc(1, sizeof(*me)); + if (me == NULL) + fatal(__func__); + + me->fec = fn->fec; + me->nexthop = ln; + + if (sent) { + RB_INSERT(lde_map_head, &fn->upstream, me); + me->head = &fn->upstream; + if (fec_insert(&ln->sent_map, &me->fec)) + log_warnx("failed to add %s to sent map", + log_fec(&me->fec)); + /* XXX on failure more cleanup is needed */ + } else { + RB_INSERT(lde_map_head, &fn->downstream, me); + me->head = &fn->downstream; + if (fec_insert(&ln->recv_map, &me->fec)) + log_warnx("failed to add %s to recv map", + log_fec(&me->fec)); + } + + return (me); +} + +void +lde_map_del(struct lde_nbr *ln, struct lde_map *me, int sent) +{ + if (sent) + fec_remove(&ln->sent_map, &me->fec); + else + fec_remove(&ln->recv_map, &me->fec); + + lde_map_free(me); +} + +static void +lde_map_free(void *ptr) +{ + struct lde_map *map = ptr; + + RB_REMOVE(lde_map_head, map->head, map); + free(map); +} + +struct fec * +lde_map_pending_add(struct lde_nbr *ln, struct fec_node *fn) +{ + struct fec *map; + + map = calloc(1, sizeof(*map)); + if (map == NULL) + fatal(__func__); + + *map = fn->fec; + if (fec_insert(&ln->sent_map_pending, map)) + log_warnx("failed to add %s to sent map (pending)", + log_fec(map)); + + return (map); +} + +void +lde_map_pending_del(struct lde_nbr *ln, struct fec *map) +{ + fec_remove(&ln->sent_map_pending, map); + free(map); +} + +struct lde_req * +lde_req_add(struct lde_nbr *ln, struct fec *fec, int sent) +{ + struct fec_tree *t; + struct lde_req *lre; + + t = sent ? &ln->sent_req : &ln->recv_req; + + lre = calloc(1, sizeof(*lre)); + if (lre != NULL) { + lre->fec = *fec; + + if (fec_insert(t, &lre->fec)) { + log_warnx("failed to add %s to %s req", + log_fec(&lre->fec), sent ? "sent" : "recv"); + free(lre); + return (NULL); + } + } + + return (lre); +} + +void +lde_req_del(struct lde_nbr *ln, struct lde_req *lre, int sent) +{ + if (sent) + fec_remove(&ln->sent_req, &lre->fec); + else + fec_remove(&ln->recv_req, &lre->fec); + + free(lre); +} + +struct lde_wdraw * +lde_wdraw_add(struct lde_nbr *ln, struct fec_node *fn) +{ + struct lde_wdraw *lw; + + lw = calloc(1, sizeof(*lw)); + if (lw == NULL) + fatal(__func__); + + lw->fec = fn->fec; + + if (fec_insert(&ln->sent_wdraw, &lw->fec)) + log_warnx("failed to add %s to sent wdraw", + log_fec(&lw->fec)); + + return (lw); +} + +void +lde_wdraw_del(struct lde_nbr *ln, struct lde_wdraw *lw) +{ + fec_remove(&ln->sent_wdraw, &lw->fec); + free(lw); +} + +void +lde_change_egress_label(int af) +{ + struct lde_nbr *ln; + struct fec *f; + struct fec_node *fn; + + /* explicitly withdraw all null labels */ + RB_FOREACH(ln, nbr_tree, &lde_nbrs) { + lde_send_labelwithdraw_wcard(ln, MPLS_LABEL_IMPLICIT_NULL); + if (ln->v4_enabled) + lde_send_labelwithdraw_wcard( + ln, + MPLS_LABEL_IPV4_EXPLICIT_NULL); + if (ln->v6_enabled) + lde_send_labelwithdraw_wcard( + ln, + MPLS_LABEL_IPV6_EXPLICIT_NULL); + } + + /* update label of connected routes */ + RB_FOREACH(f, fec_tree, &ft) { + fn = (struct fec_node *)f; + if (fn->local_label > MPLS_LABEL_RESERVED_MAX) + continue; + + switch (af) { + case AF_INET: + if (fn->fec.type != FEC_TYPE_IPV4) + continue; + break; + case AF_INET6: + if (fn->fec.type != FEC_TYPE_IPV6) + continue; + break; + default: + fatalx("lde_change_egress_label: unknown af"); + } + + fn->local_label = lde_update_label(fn); + if (fn->local_label != NO_LABEL) + RB_FOREACH(ln, nbr_tree, &lde_nbrs) + lde_send_labelmapping(ln, fn, 0); + } + RB_FOREACH(ln, nbr_tree, &lde_nbrs) + lde_imsg_compose_ldpe(IMSG_MAPPING_ADD_END, ln->peerid, 0, + NULL, 0); +} + +void +lde_change_allocate_filter(int af) +{ + struct lde_nbr *ln; + struct fec *f; + struct fec_node *fn; + uint32_t new_label; + + /* reallocate labels for fecs that match this filter */ + RB_FOREACH(f, fec_tree, &ft) { + fn = (struct fec_node *)f; + + switch (af) { + case AF_INET: + if (fn->fec.type != FEC_TYPE_IPV4) + continue; + break; + case AF_INET6: + if (fn->fec.type != FEC_TYPE_IPV6) + continue; + break; + default: + fatalx("lde_change_allocate_filter: unknown af"); + } + + /* + * If the local label has changed to NO_LABEL, send a label + * withdraw to all peers. + * If the local label has changed and it's different from + * NO_LABEL, send a label mapping to all peers advertising + * the new label. + * If the local label hasn't changed, do nothing + */ + new_label = lde_update_label(fn); + if (fn->local_label != new_label) { + if (new_label == NO_LABEL) + RB_FOREACH(ln, nbr_tree, &lde_nbrs) + lde_send_labelwithdraw(ln, fn, + NULL, NULL); + + fn->local_label = new_label; + if (fn->local_label != NO_LABEL) + RB_FOREACH(ln, nbr_tree, &lde_nbrs) + lde_send_labelmapping(ln, fn, 0); + } + } + RB_FOREACH(ln, nbr_tree, &lde_nbrs) + lde_imsg_compose_ldpe(IMSG_MAPPING_ADD_END, ln->peerid, 0, + NULL, 0); +} + +void +lde_change_advertise_filter(int af) +{ + struct lde_nbr *ln; + struct fec *f; + struct fec_node *fn; + char *acl_to_filter; + char *acl_for_filter; + union ldpd_addr *prefix; + uint8_t plen; + struct lde_map *me; + + /* advertise label for fecs to neighbors if matches advertise filters */ + switch (af) { + case AF_INET: + acl_to_filter = ldeconf->ipv4.acl_label_advertise_to; + acl_for_filter = ldeconf->ipv4.acl_label_advertise_for; + break; + case AF_INET6: + acl_to_filter = ldeconf->ipv6.acl_label_advertise_to; + acl_for_filter = ldeconf->ipv6.acl_label_advertise_for; + break; + default: + fatalx("lde_change_advertise_filter: unknown af"); + } + + RB_FOREACH(ln, nbr_tree, &lde_nbrs) { + if (lde_acl_check(acl_to_filter, af, (union ldpd_addr *)&ln->id, + IPV4_MAX_BITLEN) != FILTER_PERMIT) + lde_send_labelwithdraw_wcard(ln, NO_LABEL); + else { + /* This neighbor is allowed in to_filter, so + * send labels if fec also matches for_filter + */ + RB_FOREACH(f, fec_tree, &ft) { + fn = (struct fec_node *)f; + switch (af) { + case AF_INET: + if (fn->fec.type != FEC_TYPE_IPV4) + continue; + prefix = (union ldpd_addr *) + &fn->fec.u.ipv4.prefix; + plen = fn->fec.u.ipv4.prefixlen; + break; + case FEC_TYPE_IPV6: + if (fn->fec.type != FEC_TYPE_IPV6) + continue; + prefix = (union ldpd_addr *) + &fn->fec.u.ipv6.prefix; + plen = fn->fec.u.ipv6.prefixlen; + break; + default: + continue; + } + if (lde_acl_check(acl_for_filter, af, + prefix, plen) != FILTER_PERMIT) { + me = (struct lde_map *)fec_find( + &ln->sent_map, &fn->fec); + if (me) + /* fec filtered withdraw */ + lde_send_labelwithdraw(ln, fn, + NULL, NULL); + } else + /* fec allowed send map */ + lde_send_labelmapping(ln, fn, 0); + } + lde_imsg_compose_ldpe(IMSG_MAPPING_ADD_END, + ln->peerid, 0, NULL, 0); + } + } +} + + +void +lde_change_accept_filter(int af) +{ + struct lde_nbr *ln; + struct fec *f; + struct fec_node *fn; + char *acl_for_filter; + char *acl_from_filter; + union ldpd_addr *prefix; + uint8_t plen; + struct lde_map *me; + enum fec_type type; + + /* accept labels from neighbors specified in the from_filter and for + * fecs defined in the for_filter + */ + switch (af) { + case AF_INET: + acl_for_filter = ldeconf->ipv4.acl_label_accept_for; + acl_from_filter = ldeconf->ipv4.acl_label_accept_from; + type = FEC_TYPE_IPV4; + break; + case AF_INET6: + acl_for_filter = ldeconf->ipv6.acl_label_accept_for; + acl_from_filter = ldeconf->ipv6.acl_label_accept_from; + type = FEC_TYPE_IPV6; + break; + default: + fatalx("lde_change_accept_filter: unknown af"); + } + + RB_FOREACH(ln, nbr_tree, &lde_nbrs) { + if (lde_acl_check(acl_from_filter, AF_INET, (union ldpd_addr *) + &ln->id, IPV4_MAX_BITLEN) != FILTER_PERMIT) { + /* This neighbor is now filtered so remove fecs from + * recv list + */ + RB_FOREACH(f, fec_tree, &ft) { + fn = (struct fec_node *)f; + if (fn->fec.type == type) { + me = (struct lde_map *)fec_find( + &ln->recv_map, &fn->fec); + if (me) + lde_map_del(ln, me, 0); + } + } + } else if (ln->flags & F_NBR_CAP_TWCARD) { + /* This neighbor is allowed and supports type + * wildcard so send a labelrequest + * to get any new labels from neighbor + * and make sure any fecs we currently have + * match for_filter. + */ + RB_FOREACH(f, fec_tree, &ft) { + fn = (struct fec_node *)f; + switch (af) { + case AF_INET: + if (fn->fec.type != FEC_TYPE_IPV4) + continue; + prefix = (union ldpd_addr *) + &fn->fec.u.ipv4.prefix; + plen = fn->fec.u.ipv4.prefixlen; + break; + case AF_INET6: + if (fn->fec.type != FEC_TYPE_IPV6) + continue; + prefix = (union ldpd_addr *) + &fn->fec.u.ipv6.prefix; + plen = fn->fec.u.ipv6.prefixlen; + break; + default: + continue; + } + if (lde_acl_check(acl_for_filter, af, + prefix, plen) != FILTER_PERMIT) { + me = (struct lde_map *)fec_find( + &ln->recv_map, &fn->fec); + if (me) + lde_map_del(ln, me, 0); + } + } + lde_send_labelrequest_wcard(ln, af); + } else + /* Type Wildcard is not supported so restart session */ + lde_imsg_compose_ldpe(IMSG_NBR_SHUTDOWN, ln->peerid, 0, + NULL, 0); + } +} + +void +lde_change_expnull_for_filter(int af) +{ + struct lde_nbr *ln; + struct fec *f; + struct fec_node *fn; + char *acl_name; + uint32_t exp_label; + union ldpd_addr *prefix; + uint8_t plen; + + /* Configure explicit-null advertisement for all fecs in this filter */ + RB_FOREACH(f, fec_tree, &ft) { + fn = (struct fec_node *)f; + + switch (af) { + case AF_INET: + if (fn->fec.type != FEC_TYPE_IPV4) + continue; + acl_name = ldeconf->ipv4.acl_label_expnull_for; + prefix = (union ldpd_addr *)&fn->fec.u.ipv4.prefix; + plen = fn->fec.u.ipv4.prefixlen; + exp_label = MPLS_LABEL_IPV4_EXPLICIT_NULL; + break; + case AF_INET6: + if (fn->fec.type != FEC_TYPE_IPV6) + continue; + acl_name = ldeconf->ipv6.acl_label_expnull_for; + prefix = (union ldpd_addr *)&fn->fec.u.ipv6.prefix; + plen = fn->fec.u.ipv6.prefixlen; + exp_label = MPLS_LABEL_IPV6_EXPLICIT_NULL; + break; + default: + fatalx("lde_change_expnull_for_filter: unknown af"); + } + + if (lde_acl_check(acl_name, af, prefix, plen) == FILTER_PERMIT) { + /* for this fec change any imp-null to exp-null */ + if (fn->local_label == MPLS_LABEL_IMPLICIT_NULL) { + fn->local_label= lde_update_label(fn); + RB_FOREACH(ln, nbr_tree, &lde_nbrs) + lde_send_labelmapping(ln, fn, 0); + } + } else { + /* for this fec change any exp-null back to imp-null */ + if (fn->local_label == exp_label) { + fn->local_label = lde_update_label(fn); + RB_FOREACH(ln, nbr_tree, &lde_nbrs) + lde_send_labelmapping(ln, fn, 0); + } + } + } + RB_FOREACH(ln, nbr_tree, &lde_nbrs) + lde_imsg_compose_ldpe(IMSG_MAPPING_ADD_END, ln->peerid, 0, + NULL, 0); +} + +static int +lde_address_add(struct lde_nbr *ln, struct lde_addr *lde_addr) +{ + struct lde_addr *new; + + if (lde_address_find(ln, lde_addr->af, &lde_addr->addr) != NULL) + return (-1); + + if ((new = calloc(1, sizeof(*new))) == NULL) + fatal(__func__); + + new->af = lde_addr->af; + new->addr = lde_addr->addr; + TAILQ_INSERT_TAIL(&ln->addr_list, new, entry); + + /* reevaluate the previously received mappings from this neighbor */ + lde_nbr_addr_update(ln, lde_addr, 0); + + return (0); +} + +static int +lde_address_del(struct lde_nbr *ln, struct lde_addr *lde_addr) +{ + lde_addr = lde_address_find(ln, lde_addr->af, &lde_addr->addr); + if (lde_addr == NULL) + return (-1); + + /* reevaluate the previously received mappings from this neighbor */ + lde_nbr_addr_update(ln, lde_addr, 1); + + TAILQ_REMOVE(&ln->addr_list, lde_addr, entry); + free(lde_addr); + + return (0); +} + +struct lde_addr * +lde_address_find(struct lde_nbr *ln, int af, union ldpd_addr *addr) +{ + struct lde_addr *lde_addr; + + TAILQ_FOREACH(lde_addr, &ln->addr_list, entry) + if (lde_addr->af == af && + ldp_addrcmp(af, &lde_addr->addr, addr) == 0) + return (lde_addr); + + return (NULL); +} + +static void +lde_address_list_free(struct lde_nbr *ln) +{ + struct lde_addr *lde_addr; + + while ((lde_addr = TAILQ_POP_FIRST(&ln->addr_list, entry)) != NULL) + free(lde_addr); +} + +/* + * Event callback used to retry the label-manager sync zapi session. + */ +static void zclient_sync_retry(struct thread *thread) +{ + zclient_sync_init(); +} + +/* + * Initialize and open a synchronous zapi session. This is used by label chunk + * management code, which acquires and releases blocks of labels from the + * zebra label-manager module. + */ +static void zclient_sync_init(void) +{ + struct zclient_options options = zclient_options_default; + + options.synchronous = true; + + /* Initialize special zclient for synchronous message exchanges. */ + zclient_sync = zclient_new(master, &options, NULL, 0); + zclient_sync->sock = -1; + zclient_sync->redist_default = ZEBRA_ROUTE_LDP; + zclient_sync->session_id = 1; /* Distinguish from main session */ + zclient_sync->privs = &lde_privs; + + if (zclient_socket_connect(zclient_sync) < 0) { + log_warnx("Error connecting synchronous zclient!"); + goto retry; + } + /* make socket non-blocking */ + sock_set_nonblock(zclient_sync->sock); + + /* Send hello to notify zebra this is a synchronous client */ + if (zclient_send_hello(zclient_sync) == ZCLIENT_SEND_FAILURE) { + log_warnx("Error sending hello for synchronous zclient!"); + goto retry; + } + + /* Connect to label manager */ + if (lm_label_manager_connect(zclient_sync, 0) != 0) { + log_warnx("Error connecting to label manager!"); + goto retry; + } + + /* Finish label-manager init once the LM session is running */ + lde_label_list_init(); + + return; + +retry: + + /* Discard failed zclient object */ + zclient_stop(zclient_sync); + zclient_free(zclient_sync); + zclient_sync = NULL; + + /* Retry using a timer */ + thread_add_timer(master, zclient_sync_retry, NULL, 1, NULL); +} + +static void +lde_del_label_chunk(void *val) +{ + free(val); +} + +static int +lde_release_label_chunk(uint32_t start, uint32_t end) +{ + int ret; + + ret = lm_release_label_chunk(zclient_sync, start, end); + if (ret < 0) { + log_warnx("Error releasing label chunk!"); + return (-1); + } + return (0); +} + +static int +lde_get_label_chunk(void) +{ + int ret; + uint32_t start, end; + + debug_labels("getting label chunk (size %u)", CHUNK_SIZE); + ret = lm_get_label_chunk(zclient_sync, 0, MPLS_LABEL_BASE_ANY, + CHUNK_SIZE, &start, &end); + if (ret < 0) { + log_warnx("Error getting label chunk!"); + return -1; + } + + on_get_label_chunk_response(start, end); + + return (0); +} + +static void +lde_label_list_init(void) +{ + label_chunk_list = list_new(); + label_chunk_list->del = lde_del_label_chunk; + + /* get first chunk */ + while (lde_get_label_chunk () != 0) { + log_warnx("Error getting first label chunk!"); + sleep(1); + } +} + +static void +on_get_label_chunk_response(uint32_t start, uint32_t end) +{ + struct label_chunk *new_label_chunk; + + debug_labels("label chunk assign: %u - %u", start, end); + + new_label_chunk = calloc(1, sizeof(struct label_chunk)); + if (!new_label_chunk) { + log_warn("Error trying to allocate label chunk %u - %u", start, end); + return; + } + + new_label_chunk->start = start; + new_label_chunk->end = end; + new_label_chunk->used_mask = 0; + + listnode_add(label_chunk_list, (void *)new_label_chunk); + + /* let's update current if needed */ + if (!current_label_chunk) + current_label_chunk = listtail(label_chunk_list); +} + +void +lde_free_label(uint32_t label) +{ + struct listnode *node; + struct label_chunk *label_chunk; + uint64_t pos; + + for (ALL_LIST_ELEMENTS_RO(label_chunk_list, node, label_chunk)) { + if (label <= label_chunk->end && label >= label_chunk->start) { + pos = 1ULL << (label - label_chunk->start); + label_chunk->used_mask &= ~pos; + /* if nobody is using this chunk and it's not current_label_chunk, then free it */ + if (!label_chunk->used_mask && (current_label_chunk != node)) { + if (lde_release_label_chunk(label_chunk->start, label_chunk->end) != 0) + log_warnx("%s: Error releasing label chunk!", __func__); + else { + listnode_delete(label_chunk_list, label_chunk); + lde_del_label_chunk(label_chunk); + } + } + break; + } + } + return; +} + +static uint32_t +lde_get_next_label(void) +{ + struct label_chunk *label_chunk; + uint32_t i, size; + uint64_t pos; + uint32_t label = NO_LABEL; + + while (current_label_chunk) { + label_chunk = listgetdata(current_label_chunk); + if (!label_chunk) + goto end; + + /* try to get next free label in currently used label chunk */ + size = label_chunk->end - label_chunk->start + 1; + for (i = 0, pos = 1; i < size; i++, pos <<= 1) { + if (!(pos & label_chunk->used_mask)) { + label_chunk->used_mask |= pos; + label = label_chunk->start + i; + goto end; + } + } + current_label_chunk = listnextnode(current_label_chunk); + } + +end: + /* we moved till the last chunk, or were not able to find a label, + so let's ask for another one */ + if (!current_label_chunk || + current_label_chunk == listtail(label_chunk_list) || + label == NO_LABEL) { + if (lde_get_label_chunk() != 0) + log_warn("%s: Error getting label chunk!", __func__); + + } + + return (label); +} + +static void +lde_check_filter_af(int af, struct ldpd_af_conf *af_conf, + const char *filter_name) +{ + if (strcmp(af_conf->acl_label_allocate_for, filter_name) == 0) + lde_change_allocate_filter(af); + if ((strcmp(af_conf->acl_label_advertise_to, filter_name) == 0) + || (strcmp(af_conf->acl_label_advertise_for, filter_name) == 0)) + lde_change_advertise_filter(af); + if ((strcmp(af_conf->acl_label_accept_for, filter_name) == 0) + || (strcmp(af_conf->acl_label_accept_from, filter_name) == 0)) + lde_change_accept_filter(af); + if (strcmp(af_conf->acl_label_expnull_for, filter_name) == 0) + lde_change_expnull_for_filter(af); +} + +void lde_route_update(struct iface *iface, int af) +{ + struct fec *f; + struct fec_node *fn; + struct fec_nh *fnh; + struct lde_nbr *ln; + + /* update label of non-connected routes */ + log_debug("update labels for interface %s", iface->name); + RB_FOREACH(f, fec_tree, &ft) { + fn = (struct fec_node *)f; + if (IS_MPLS_UNRESERVED_LABEL(fn->local_label)) + continue; + + switch (af) { + case AF_INET: + if (fn->fec.type != FEC_TYPE_IPV4) + continue; + break; + case AF_INET6: + if (fn->fec.type != FEC_TYPE_IPV6) + continue; + break; + default: + /* unspecified so process both address families */ + break; + } + + LIST_FOREACH(fnh, &fn->nexthops, entry) { + /* + * If connected leave existing label. If LDP + * configured on interface or a static route + * may need new label. If no LDP configured + * treat fec as a connected route + */ + if (fnh->flags & F_FEC_NH_CONNECTED) + break; + + if (fnh->ifindex != iface->ifindex) + continue; + + fnh->flags &= ~F_FEC_NH_NO_LDP; + if (IS_MPLS_RESERVED_LABEL(fn->local_label)) { + fn->local_label = NO_LABEL; + fn->local_label = lde_update_label(fn); + if (fn->local_label != NO_LABEL) + RB_FOREACH(ln, nbr_tree, &lde_nbrs) + lde_send_labelmapping( + ln, fn, 0); + } + break; + } + } + RB_FOREACH(ln, nbr_tree, &lde_nbrs) + lde_imsg_compose_ldpe(IMSG_MAPPING_ADD_END, ln->peerid, + 0, NULL, 0); +} + +void lde_route_update_release(struct iface *iface, int af) +{ + struct lde_nbr *ln; + struct fec *f; + struct fec_node *fn; + struct fec_nh *fnh; + + /* update label of interfaces no longer running LDP */ + log_debug("release all labels for interface %s af %s", iface->name, + af == AF_INET ? "ipv4" : "ipv6"); + RB_FOREACH(f, fec_tree, &ft) { + fn = (struct fec_node *)f; + + switch (af) { + case AF_INET: + if (fn->fec.type != FEC_TYPE_IPV4) + continue; + break; + case AF_INET6: + if (fn->fec.type != FEC_TYPE_IPV6) + continue; + break; + default: + fatalx("lde_route_update_release: unknown af"); + } + + if (fn->local_label == NO_LABEL) + continue; + + LIST_FOREACH(fnh, &fn->nexthops, entry) { + /* + * If connected leave existing label. If LDP + * removed from interface may need new label + * and would be treated as a connected route + */ + if (fnh->flags & F_FEC_NH_CONNECTED) + break; + + if (fnh->ifindex != iface->ifindex) + continue; + + fnh->flags |= F_FEC_NH_NO_LDP; + RB_FOREACH(ln, nbr_tree, &lde_nbrs) + lde_send_labelwithdraw(ln, fn, NULL, NULL); + lde_free_label(fn->local_label); + fn->local_label = NO_LABEL; + fn->local_label = lde_update_label(fn); + if (fn->local_label != NO_LABEL) + RB_FOREACH(ln, nbr_tree, &lde_nbrs) + lde_send_labelmapping(ln, fn, 0); + break; + } + } + RB_FOREACH(ln, nbr_tree, &lde_nbrs) + lde_imsg_compose_ldpe(IMSG_MAPPING_ADD_END, ln->peerid, + 0, NULL, 0); +} + +void lde_route_update_release_all(int af) +{ + struct lde_nbr *ln; + struct fec *f; + struct fec_node *fn; + struct fec_nh *fnh; + + /* remove labels from all interfaces as LDP is no longer running for + * this address family + */ + log_debug("release all labels for address family %s", + af == AF_INET ? "ipv4" : "ipv6"); + RB_FOREACH(f, fec_tree, &ft) { + fn = (struct fec_node *)f; + switch (af) { + case AF_INET: + if (fn->fec.type != FEC_TYPE_IPV4) + continue; + break; + case AF_INET6: + if (fn->fec.type != FEC_TYPE_IPV6) + continue; + break; + default: + fatalx("lde_route_update_release: unknown af"); + } + + RB_FOREACH(ln, nbr_tree, &lde_nbrs) + lde_send_labelwithdraw(ln, fn, NULL, NULL); + + LIST_FOREACH(fnh, &fn->nexthops, entry) { + fnh->flags |= F_FEC_NH_NO_LDP; + lde_send_delete_klabel(fn, fnh); + } + } +} |