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/* $OpenBSD: neighbor.c,v 1.79 2017/03/04 00:15:35 renato Exp $ */ |
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/* |
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* Copyright (c) 2013, 2016 Renato Westphal <renato@openbsd.org> |
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* Copyright (c) 2009 Michele Marchetto <michele@openbsd.org> |
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* Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org> |
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* Copyright (c) 2004, 2005, 2008 Esben Norby <norby@openbsd.org> |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <sys/types.h> |
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#include <sys/time.h> |
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#include <netinet/tcp.h> |
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#include <arpa/inet.h> |
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#include <errno.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include "ldpd.h" |
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#include "ldpe.h" |
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#include "lde.h" |
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#include "log.h" |
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static __inline int nbr_id_compare(struct nbr *, struct nbr *); |
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static __inline int nbr_addr_compare(struct nbr *, struct nbr *); |
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static __inline int nbr_pid_compare(struct nbr *, struct nbr *); |
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static void nbr_update_peerid(struct nbr *); |
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static void nbr_ktimer(int, short, void *); |
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static void nbr_start_ktimer(struct nbr *); |
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static void nbr_ktimeout(int, short, void *); |
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static void nbr_start_ktimeout(struct nbr *); |
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static void nbr_itimeout(int, short, void *); |
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static void nbr_start_itimeout(struct nbr *); |
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static void nbr_idtimer(int, short, void *); |
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static int nbr_act_session_operational(struct nbr *); |
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static void nbr_send_labelmappings(struct nbr *); |
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RB_GENERATE(nbr_id_head, nbr, id_tree, nbr_id_compare) |
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RB_GENERATE(nbr_addr_head, nbr, addr_tree, nbr_addr_compare) |
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RB_GENERATE(nbr_pid_head, nbr, pid_tree, nbr_pid_compare) |
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struct { |
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int state; |
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enum nbr_event event; |
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enum nbr_action action; |
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int new_state; |
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} nbr_fsm_tbl[] = { |
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/* current state event that happened action to take resulting state */ |
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/* Passive Role */ |
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{NBR_STA_PRESENT, NBR_EVT_MATCH_ADJ, NBR_ACT_NOTHING, NBR_STA_INITIAL}, |
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{NBR_STA_INITIAL, NBR_EVT_INIT_RCVD, NBR_ACT_PASSIVE_INIT, NBR_STA_OPENREC}, |
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{NBR_STA_OPENREC, NBR_EVT_KEEPALIVE_RCVD, NBR_ACT_SESSION_EST, NBR_STA_OPER}, |
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/* Active Role */ |
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{NBR_STA_PRESENT, NBR_EVT_CONNECT_UP, NBR_ACT_CONNECT_SETUP, NBR_STA_INITIAL}, |
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{NBR_STA_INITIAL, NBR_EVT_INIT_SENT, NBR_ACT_NOTHING, NBR_STA_OPENSENT}, |
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{NBR_STA_OPENSENT, NBR_EVT_INIT_RCVD, NBR_ACT_KEEPALIVE_SEND, NBR_STA_OPENREC}, |
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/* Session Maintenance */ |
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{NBR_STA_OPER, NBR_EVT_PDU_RCVD, NBR_ACT_RST_KTIMEOUT, 0}, |
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{NBR_STA_SESSION, NBR_EVT_PDU_RCVD, NBR_ACT_NOTHING, 0}, |
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{NBR_STA_OPER, NBR_EVT_PDU_SENT, NBR_ACT_RST_KTIMER, 0}, |
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{NBR_STA_SESSION, NBR_EVT_PDU_SENT, NBR_ACT_NOTHING, 0}, |
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/* Session Close */ |
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{NBR_STA_PRESENT, NBR_EVT_CLOSE_SESSION, NBR_ACT_NOTHING, 0}, |
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{NBR_STA_SESSION, NBR_EVT_CLOSE_SESSION, NBR_ACT_CLOSE_SESSION, NBR_STA_PRESENT}, |
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{-1, NBR_EVT_NOTHING, NBR_ACT_NOTHING, 0}, |
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}; |
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const char * const nbr_event_names[] = { |
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"NOTHING", |
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"ADJACENCY MATCHED", |
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"CONNECTION UP", |
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"SESSION CLOSE", |
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"INIT RECEIVED", |
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"KEEPALIVE RECEIVED", |
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"PDU RECEIVED", |
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"PDU SENT", |
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"INIT SENT" |
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}; |
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const char * const nbr_action_names[] = { |
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"NOTHING", |
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"RESET KEEPALIVE TIMEOUT", |
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"START NEIGHBOR SESSION", |
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"RESET KEEPALIVE TIMER", |
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"SETUP NEIGHBOR CONNECTION", |
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"SEND INIT AND KEEPALIVE", |
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"SEND KEEPALIVE", |
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"CLOSE SESSION" |
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}; |
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struct nbr_id_head nbrs_by_id = RB_INITIALIZER(&nbrs_by_id); |
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struct nbr_addr_head nbrs_by_addr = RB_INITIALIZER(&nbrs_by_addr); |
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struct nbr_pid_head nbrs_by_pid = RB_INITIALIZER(&nbrs_by_pid); |
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static __inline int |
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nbr_id_compare(struct nbr *a, struct nbr *b) |
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{ |
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return (ntohl(a->id.s_addr) - ntohl(b->id.s_addr)); |
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} |
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static __inline int |
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nbr_addr_compare(struct nbr *a, struct nbr *b) |
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{ |
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if (a->af < b->af) |
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return (-1); |
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if (a->af > b->af) |
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return (1); |
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return (ldp_addrcmp(a->af, &a->raddr, &b->raddr)); |
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} |
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static __inline int |
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nbr_pid_compare(struct nbr *a, struct nbr *b) |
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{ |
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return (a->peerid - b->peerid); |
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} |
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int |
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nbr_fsm(struct nbr *nbr, enum nbr_event event) |
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{ |
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struct timeval now; |
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int old_state; |
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int new_state = 0; |
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int i; |
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old_state = nbr->state; |
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for (i = 0; nbr_fsm_tbl[i].state != -1; i++) |
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if ((nbr_fsm_tbl[i].state & old_state) && |
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(nbr_fsm_tbl[i].event == event)) { |
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new_state = nbr_fsm_tbl[i].new_state; |
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break; |
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} |
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if (nbr_fsm_tbl[i].state == -1) { |
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/* event outside of the defined fsm, ignore it. */ |
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log_warnx("%s: lsr-id %s, event %s not expected in " |
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"state %s", __func__, inet_ntoa(nbr->id), |
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nbr_event_names[event], nbr_state_name(old_state)); |
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return (0); |
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} |
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if (new_state != 0) |
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nbr->state = new_state; |
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if (old_state != nbr->state) { |
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log_debug("%s: event %s resulted in action %s and " |
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"changing state for lsr-id %s from %s to %s", |
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__func__, nbr_event_names[event], |
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nbr_action_names[nbr_fsm_tbl[i].action], |
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inet_ntoa(nbr->id), nbr_state_name(old_state), |
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nbr_state_name(nbr->state)); |
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if (nbr->state == NBR_STA_OPER) { |
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gettimeofday(&now, NULL); |
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nbr->uptime = now.tv_sec; |
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} |
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} |
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if (nbr->state == NBR_STA_OPER || nbr->state == NBR_STA_PRESENT) |
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nbr_stop_itimeout(nbr); |
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else |
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nbr_start_itimeout(nbr); |
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switch (nbr_fsm_tbl[i].action) { |
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case NBR_ACT_RST_KTIMEOUT: |
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nbr_start_ktimeout(nbr); |
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break; |
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case NBR_ACT_RST_KTIMER: |
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nbr_start_ktimer(nbr); |
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break; |
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case NBR_ACT_SESSION_EST: |
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nbr_act_session_operational(nbr); |
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nbr_start_ktimer(nbr); |
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nbr_start_ktimeout(nbr); |
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if (nbr->v4_enabled) |
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send_address_all(nbr, AF_INET); |
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if (nbr->v6_enabled) |
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send_address_all(nbr, AF_INET6); |
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nbr_send_labelmappings(nbr); |
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break; |
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case NBR_ACT_CONNECT_SETUP: |
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nbr->tcp = tcp_new(nbr->fd, nbr); |
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/* trigger next state */ |
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send_init(nbr); |
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nbr_fsm(nbr, NBR_EVT_INIT_SENT); |
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break; |
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case NBR_ACT_PASSIVE_INIT: |
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send_init(nbr); |
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send_keepalive(nbr); |
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break; |
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case NBR_ACT_KEEPALIVE_SEND: |
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nbr_start_ktimeout(nbr); |
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send_keepalive(nbr); |
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break; |
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case NBR_ACT_CLOSE_SESSION: |
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ldpe_imsg_compose_lde(IMSG_NEIGHBOR_DOWN, nbr->peerid, 0, |
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NULL, 0); |
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session_close(nbr); |
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break; |
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case NBR_ACT_NOTHING: |
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/* do nothing */ |
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break; |
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} |
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return (0); |
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} |
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struct nbr * |
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nbr_new(struct in_addr id, int af, int ds_tlv, union ldpd_addr *addr, |
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uint32_t scope_id) |
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{ |
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struct nbr *nbr; |
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struct nbr_params *nbrp; |
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struct adj *adj; |
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struct pending_conn *pconn; |
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log_debug("%s: lsr-id %s transport-address %s", __func__, |
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inet_ntoa(id), log_addr(af, addr)); |
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if ((nbr = calloc(1, sizeof(*nbr))) == NULL) |
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fatal(__func__); |
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LIST_INIT(&nbr->adj_list); |
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nbr->state = NBR_STA_PRESENT; |
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nbr->peerid = 0; |
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nbr->af = af; |
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nbr->ds_tlv = ds_tlv; |
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if (af == AF_INET || ds_tlv) |
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nbr->v4_enabled = 1; |
243 |
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if (af == AF_INET6 || ds_tlv) |
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nbr->v6_enabled = 1; |
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nbr->id = id; |
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nbr->laddr = (ldp_af_conf_get(leconf, af))->trans_addr; |
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nbr->raddr = *addr; |
248 |
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nbr->raddr_scope = scope_id; |
249 |
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nbr->conf_seqnum = 0; |
250 |
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251 |
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LIST_FOREACH(adj, &global.adj_list, global_entry) { |
252 |
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if (adj->lsr_id.s_addr == nbr->id.s_addr) { |
253 |
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adj->nbr = nbr; |
254 |
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LIST_INSERT_HEAD(&nbr->adj_list, adj, nbr_entry); |
255 |
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} |
256 |
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} |
257 |
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258 |
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if (RB_INSERT(nbr_id_head, &nbrs_by_id, nbr) != NULL) |
259 |
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fatalx("nbr_new: RB_INSERT(nbrs_by_id) failed"); |
260 |
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if (RB_INSERT(nbr_addr_head, &nbrs_by_addr, nbr) != NULL) |
261 |
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fatalx("nbr_new: RB_INSERT(nbrs_by_addr) failed"); |
262 |
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263 |
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TAILQ_INIT(&nbr->mapping_list); |
264 |
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TAILQ_INIT(&nbr->withdraw_list); |
265 |
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TAILQ_INIT(&nbr->request_list); |
266 |
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TAILQ_INIT(&nbr->release_list); |
267 |
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TAILQ_INIT(&nbr->abortreq_list); |
268 |
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269 |
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/* set event structures */ |
270 |
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evtimer_set(&nbr->keepalive_timeout, nbr_ktimeout, nbr); |
271 |
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evtimer_set(&nbr->keepalive_timer, nbr_ktimer, nbr); |
272 |
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evtimer_set(&nbr->init_timeout, nbr_itimeout, nbr); |
273 |
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evtimer_set(&nbr->initdelay_timer, nbr_idtimer, nbr); |
274 |
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275 |
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nbrp = nbr_params_find(leconf, nbr->id); |
276 |
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if (nbrp && pfkey_establish(nbr, nbrp) == -1) |
277 |
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fatalx("pfkey setup failed"); |
278 |
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279 |
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pconn = pending_conn_find(nbr->af, &nbr->raddr); |
280 |
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if (pconn) { |
281 |
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session_accept_nbr(nbr, pconn->fd); |
282 |
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pending_conn_del(pconn); |
283 |
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} |
284 |
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285 |
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return (nbr); |
286 |
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} |
287 |
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288 |
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void |
289 |
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nbr_del(struct nbr *nbr) |
290 |
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{ |
291 |
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log_debug("%s: lsr-id %s", __func__, inet_ntoa(nbr->id)); |
292 |
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293 |
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nbr_fsm(nbr, NBR_EVT_CLOSE_SESSION); |
294 |
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pfkey_remove(nbr); |
295 |
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296 |
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if (nbr_pending_connect(nbr)) |
297 |
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event_del(&nbr->ev_connect); |
298 |
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nbr_stop_ktimer(nbr); |
299 |
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nbr_stop_ktimeout(nbr); |
300 |
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nbr_stop_itimeout(nbr); |
301 |
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nbr_stop_idtimer(nbr); |
302 |
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303 |
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mapping_list_clr(&nbr->mapping_list); |
304 |
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mapping_list_clr(&nbr->withdraw_list); |
305 |
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mapping_list_clr(&nbr->request_list); |
306 |
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mapping_list_clr(&nbr->release_list); |
307 |
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mapping_list_clr(&nbr->abortreq_list); |
308 |
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309 |
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if (nbr->peerid) |
310 |
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RB_REMOVE(nbr_pid_head, &nbrs_by_pid, nbr); |
311 |
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RB_REMOVE(nbr_id_head, &nbrs_by_id, nbr); |
312 |
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RB_REMOVE(nbr_addr_head, &nbrs_by_addr, nbr); |
313 |
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314 |
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free(nbr); |
315 |
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} |
316 |
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317 |
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static void |
318 |
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nbr_update_peerid(struct nbr *nbr) |
319 |
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{ |
320 |
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static uint32_t peercnt = 1; |
321 |
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322 |
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if (nbr->peerid) |
323 |
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RB_REMOVE(nbr_pid_head, &nbrs_by_pid, nbr); |
324 |
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325 |
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/* get next unused peerid */ |
326 |
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while (nbr_find_peerid(++peercnt)) |
327 |
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; |
328 |
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nbr->peerid = peercnt; |
329 |
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330 |
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if (RB_INSERT(nbr_pid_head, &nbrs_by_pid, nbr) != NULL) |
331 |
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fatalx("nbr_update_peerid: RB_INSERT(nbrs_by_pid) failed"); |
332 |
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} |
333 |
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|
334 |
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struct nbr * |
335 |
|
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nbr_find_ldpid(uint32_t lsr_id) |
336 |
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{ |
337 |
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struct nbr n; |
338 |
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n.id.s_addr = lsr_id; |
339 |
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return (RB_FIND(nbr_id_head, &nbrs_by_id, &n)); |
340 |
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} |
341 |
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342 |
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struct nbr * |
343 |
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nbr_find_addr(int af, union ldpd_addr *addr) |
344 |
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{ |
345 |
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struct nbr n; |
346 |
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n.af = af; |
347 |
|
|
n.raddr = *addr; |
348 |
|
|
return (RB_FIND(nbr_addr_head, &nbrs_by_addr, &n)); |
349 |
|
|
} |
350 |
|
|
|
351 |
|
|
struct nbr * |
352 |
|
|
nbr_find_peerid(uint32_t peerid) |
353 |
|
|
{ |
354 |
|
|
struct nbr n; |
355 |
|
|
n.peerid = peerid; |
356 |
|
|
return (RB_FIND(nbr_pid_head, &nbrs_by_pid, &n)); |
357 |
|
|
} |
358 |
|
|
|
359 |
|
|
int |
360 |
|
|
nbr_adj_count(struct nbr *nbr, int af) |
361 |
|
|
{ |
362 |
|
|
struct adj *adj; |
363 |
|
|
int total = 0; |
364 |
|
|
|
365 |
|
|
LIST_FOREACH(adj, &nbr->adj_list, nbr_entry) |
366 |
|
|
if (adj_get_af(adj) == af) |
367 |
|
|
total++; |
368 |
|
|
|
369 |
|
|
return (total); |
370 |
|
|
} |
371 |
|
|
|
372 |
|
|
int |
373 |
|
|
nbr_session_active_role(struct nbr *nbr) |
374 |
|
|
{ |
375 |
|
|
if (ldp_addrcmp(nbr->af, &nbr->laddr, &nbr->raddr) > 0) |
376 |
|
|
return (1); |
377 |
|
|
|
378 |
|
|
return (0); |
379 |
|
|
} |
380 |
|
|
|
381 |
|
|
/* timers */ |
382 |
|
|
|
383 |
|
|
/* Keepalive timer: timer to send keepalive message to neighbors */ |
384 |
|
|
|
385 |
|
|
static void |
386 |
|
|
nbr_ktimer(int fd, short event, void *arg) |
387 |
|
|
{ |
388 |
|
|
struct nbr *nbr = arg; |
389 |
|
|
|
390 |
|
|
send_keepalive(nbr); |
391 |
|
|
nbr_start_ktimer(nbr); |
392 |
|
|
} |
393 |
|
|
|
394 |
|
|
static void |
395 |
|
|
nbr_start_ktimer(struct nbr *nbr) |
396 |
|
|
{ |
397 |
|
|
struct timeval tv; |
398 |
|
|
|
399 |
|
|
/* send three keepalives per period */ |
400 |
|
|
timerclear(&tv); |
401 |
|
|
tv.tv_sec = (time_t)(nbr->keepalive / KEEPALIVE_PER_PERIOD); |
402 |
|
|
if (evtimer_add(&nbr->keepalive_timer, &tv) == -1) |
403 |
|
|
fatal(__func__); |
404 |
|
|
} |
405 |
|
|
|
406 |
|
|
void |
407 |
|
|
nbr_stop_ktimer(struct nbr *nbr) |
408 |
|
|
{ |
409 |
|
|
if (evtimer_pending(&nbr->keepalive_timer, NULL) && |
410 |
|
|
evtimer_del(&nbr->keepalive_timer) == -1) |
411 |
|
|
fatal(__func__); |
412 |
|
|
} |
413 |
|
|
|
414 |
|
|
/* Keepalive timeout: if the nbr hasn't sent keepalive */ |
415 |
|
|
|
416 |
|
|
static void |
417 |
|
|
nbr_ktimeout(int fd, short event, void *arg) |
418 |
|
|
{ |
419 |
|
|
struct nbr *nbr = arg; |
420 |
|
|
|
421 |
|
|
log_debug("%s: lsr-id %s", __func__, inet_ntoa(nbr->id)); |
422 |
|
|
|
423 |
|
|
session_shutdown(nbr, S_KEEPALIVE_TMR, 0, 0); |
424 |
|
|
} |
425 |
|
|
|
426 |
|
|
static void |
427 |
|
|
nbr_start_ktimeout(struct nbr *nbr) |
428 |
|
|
{ |
429 |
|
|
struct timeval tv; |
430 |
|
|
|
431 |
|
|
timerclear(&tv); |
432 |
|
|
tv.tv_sec = nbr->keepalive; |
433 |
|
|
|
434 |
|
|
if (evtimer_add(&nbr->keepalive_timeout, &tv) == -1) |
435 |
|
|
fatal(__func__); |
436 |
|
|
} |
437 |
|
|
|
438 |
|
|
void |
439 |
|
|
nbr_stop_ktimeout(struct nbr *nbr) |
440 |
|
|
{ |
441 |
|
|
if (evtimer_pending(&nbr->keepalive_timeout, NULL) && |
442 |
|
|
evtimer_del(&nbr->keepalive_timeout) == -1) |
443 |
|
|
fatal(__func__); |
444 |
|
|
} |
445 |
|
|
|
446 |
|
|
/* Session initialization timeout: if nbr got stuck in the initialization FSM */ |
447 |
|
|
|
448 |
|
|
static void |
449 |
|
|
nbr_itimeout(int fd, short event, void *arg) |
450 |
|
|
{ |
451 |
|
|
struct nbr *nbr = arg; |
452 |
|
|
|
453 |
|
|
log_debug("%s: lsr-id %s", __func__, inet_ntoa(nbr->id)); |
454 |
|
|
|
455 |
|
|
nbr_fsm(nbr, NBR_EVT_CLOSE_SESSION); |
456 |
|
|
} |
457 |
|
|
|
458 |
|
|
static void |
459 |
|
|
nbr_start_itimeout(struct nbr *nbr) |
460 |
|
|
{ |
461 |
|
|
struct timeval tv; |
462 |
|
|
|
463 |
|
|
timerclear(&tv); |
464 |
|
|
tv.tv_sec = INIT_FSM_TIMEOUT; |
465 |
|
|
if (evtimer_add(&nbr->init_timeout, &tv) == -1) |
466 |
|
|
fatal(__func__); |
467 |
|
|
} |
468 |
|
|
|
469 |
|
|
void |
470 |
|
|
nbr_stop_itimeout(struct nbr *nbr) |
471 |
|
|
{ |
472 |
|
|
if (evtimer_pending(&nbr->init_timeout, NULL) && |
473 |
|
|
evtimer_del(&nbr->init_timeout) == -1) |
474 |
|
|
fatal(__func__); |
475 |
|
|
} |
476 |
|
|
|
477 |
|
|
/* Init delay timer: timer to retry to iniziatize session */ |
478 |
|
|
|
479 |
|
|
static void |
480 |
|
|
nbr_idtimer(int fd, short event, void *arg) |
481 |
|
|
{ |
482 |
|
|
struct nbr *nbr = arg; |
483 |
|
|
|
484 |
|
|
log_debug("%s: lsr-id %s", __func__, inet_ntoa(nbr->id)); |
485 |
|
|
|
486 |
|
|
nbr_establish_connection(nbr); |
487 |
|
|
} |
488 |
|
|
|
489 |
|
|
void |
490 |
|
|
nbr_start_idtimer(struct nbr *nbr) |
491 |
|
|
{ |
492 |
|
|
struct timeval tv; |
493 |
|
|
|
494 |
|
|
timerclear(&tv); |
495 |
|
|
|
496 |
|
|
tv.tv_sec = INIT_DELAY_TMR; |
497 |
|
|
switch(nbr->idtimer_cnt) { |
498 |
|
|
default: |
499 |
|
|
/* do not further increase the counter */ |
500 |
|
|
tv.tv_sec = MAX_DELAY_TMR; |
501 |
|
|
break; |
502 |
|
|
case 2: |
503 |
|
|
tv.tv_sec *= 2; |
504 |
|
|
/* FALLTHROUGH */ |
505 |
|
|
case 1: |
506 |
|
|
tv.tv_sec *= 2; |
507 |
|
|
/* FALLTHROUGH */ |
508 |
|
|
case 0: |
509 |
|
|
nbr->idtimer_cnt++; |
510 |
|
|
break; |
511 |
|
|
} |
512 |
|
|
|
513 |
|
|
if (evtimer_add(&nbr->initdelay_timer, &tv) == -1) |
514 |
|
|
fatal(__func__); |
515 |
|
|
} |
516 |
|
|
|
517 |
|
|
void |
518 |
|
|
nbr_stop_idtimer(struct nbr *nbr) |
519 |
|
|
{ |
520 |
|
|
if (evtimer_pending(&nbr->initdelay_timer, NULL) && |
521 |
|
|
evtimer_del(&nbr->initdelay_timer) == -1) |
522 |
|
|
fatal(__func__); |
523 |
|
|
} |
524 |
|
|
|
525 |
|
|
int |
526 |
|
|
nbr_pending_idtimer(struct nbr *nbr) |
527 |
|
|
{ |
528 |
|
|
if (evtimer_pending(&nbr->initdelay_timer, NULL)) |
529 |
|
|
return (1); |
530 |
|
|
|
531 |
|
|
return (0); |
532 |
|
|
} |
533 |
|
|
|
534 |
|
|
int |
535 |
|
|
nbr_pending_connect(struct nbr *nbr) |
536 |
|
|
{ |
537 |
|
|
if (event_initialized(&nbr->ev_connect) && |
538 |
|
|
event_pending(&nbr->ev_connect, EV_WRITE, NULL)) |
539 |
|
|
return (1); |
540 |
|
|
|
541 |
|
|
return (0); |
542 |
|
|
} |
543 |
|
|
|
544 |
|
|
static void |
545 |
|
|
nbr_connect_cb(int fd, short event, void *arg) |
546 |
|
|
{ |
547 |
|
|
struct nbr *nbr = arg; |
548 |
|
|
int error; |
549 |
|
|
socklen_t len; |
550 |
|
|
|
551 |
|
|
len = sizeof(error); |
552 |
|
|
if (getsockopt(nbr->fd, SOL_SOCKET, SO_ERROR, &error, &len) < 0) { |
553 |
|
|
log_warn("%s: getsockopt SOL_SOCKET SO_ERROR", __func__); |
554 |
|
|
return; |
555 |
|
|
} |
556 |
|
|
|
557 |
|
|
if (error) { |
558 |
|
|
close(nbr->fd); |
559 |
|
|
errno = error; |
560 |
|
|
log_debug("%s: error while connecting to %s: %s", __func__, |
561 |
|
|
log_addr(nbr->af, &nbr->raddr), strerror(errno)); |
562 |
|
|
return; |
563 |
|
|
} |
564 |
|
|
|
565 |
|
|
nbr_fsm(nbr, NBR_EVT_CONNECT_UP); |
566 |
|
|
} |
567 |
|
|
|
568 |
|
|
int |
569 |
|
|
nbr_establish_connection(struct nbr *nbr) |
570 |
|
|
{ |
571 |
|
|
struct sockaddr_storage local_sa; |
572 |
|
|
struct sockaddr_storage remote_sa; |
573 |
|
|
struct adj *adj; |
574 |
|
|
struct nbr_params *nbrp; |
575 |
|
|
int opt = 1; |
576 |
|
|
|
577 |
|
|
nbr->fd = socket(nbr->af, |
578 |
|
|
SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0); |
579 |
|
|
if (nbr->fd == -1) { |
580 |
|
|
log_warn("%s: error while creating socket", __func__); |
581 |
|
|
return (-1); |
582 |
|
|
} |
583 |
|
|
|
584 |
|
|
nbrp = nbr_params_find(leconf, nbr->id); |
585 |
|
|
if (nbrp && nbrp->auth.method == AUTH_MD5SIG) { |
586 |
|
|
if (sysdep.no_pfkey || sysdep.no_md5sig) { |
587 |
|
|
log_warnx("md5sig configured but not available"); |
588 |
|
|
close(nbr->fd); |
589 |
|
|
return (-1); |
590 |
|
|
} |
591 |
|
|
if (setsockopt(nbr->fd, IPPROTO_TCP, TCP_MD5SIG, |
592 |
|
|
&opt, sizeof(opt)) == -1) { |
593 |
|
|
log_warn("setsockopt md5sig"); |
594 |
|
|
close(nbr->fd); |
595 |
|
|
return (-1); |
596 |
|
|
} |
597 |
|
|
} |
598 |
|
|
|
599 |
|
|
memcpy(&local_sa, addr2sa(nbr->af, &nbr->laddr, 0), sizeof(local_sa)); |
600 |
|
|
memcpy(&remote_sa, addr2sa(nbr->af, &nbr->raddr, LDP_PORT), |
601 |
|
|
sizeof(local_sa)); |
602 |
|
|
if (nbr->af == AF_INET6 && nbr->raddr_scope) |
603 |
|
|
addscope((struct sockaddr_in6 *)&remote_sa, nbr->raddr_scope); |
604 |
|
|
|
605 |
|
|
if (bind(nbr->fd, (struct sockaddr *)&local_sa, |
606 |
|
|
local_sa.ss_len) == -1) { |
607 |
|
|
log_warn("%s: error while binding socket to %s", __func__, |
608 |
|
|
log_sockaddr((struct sockaddr *)&local_sa)); |
609 |
|
|
close(nbr->fd); |
610 |
|
|
return (-1); |
611 |
|
|
} |
612 |
|
|
|
613 |
|
|
if (nbr_gtsm_check(nbr->fd, nbr, nbrp)) { |
614 |
|
|
close(nbr->fd); |
615 |
|
|
return (-1); |
616 |
|
|
} |
617 |
|
|
|
618 |
|
|
/* |
619 |
|
|
* Send an extra hello to guarantee that the remote peer has formed |
620 |
|
|
* an adjacency as well. |
621 |
|
|
*/ |
622 |
|
|
LIST_FOREACH(adj, &nbr->adj_list, nbr_entry) |
623 |
|
|
send_hello(adj->source.type, adj->source.link.ia, |
624 |
|
|
adj->source.target); |
625 |
|
|
|
626 |
|
|
if (connect(nbr->fd, (struct sockaddr *)&remote_sa, |
627 |
|
|
remote_sa.ss_len) == -1) { |
628 |
|
|
if (errno == EINPROGRESS) { |
629 |
|
|
event_set(&nbr->ev_connect, nbr->fd, EV_WRITE, |
630 |
|
|
nbr_connect_cb, nbr); |
631 |
|
|
event_add(&nbr->ev_connect, NULL); |
632 |
|
|
return (0); |
633 |
|
|
} |
634 |
|
|
log_warn("%s: error while connecting to %s", __func__, |
635 |
|
|
log_sockaddr((struct sockaddr *)&remote_sa)); |
636 |
|
|
close(nbr->fd); |
637 |
|
|
return (-1); |
638 |
|
|
} |
639 |
|
|
|
640 |
|
|
/* connection completed immediately */ |
641 |
|
|
nbr_fsm(nbr, NBR_EVT_CONNECT_UP); |
642 |
|
|
|
643 |
|
|
return (0); |
644 |
|
|
} |
645 |
|
|
|
646 |
|
|
int |
647 |
|
|
nbr_gtsm_enabled(struct nbr *nbr, struct nbr_params *nbrp) |
648 |
|
|
{ |
649 |
|
|
/* |
650 |
|
|
* RFC 6720 - Section 3: |
651 |
|
|
* "This document allows for the implementation to provide an option to |
652 |
|
|
* statically (e.g., via configuration) and/or dynamically override the |
653 |
|
|
* default behavior and enable/disable GTSM on a per-peer basis". |
654 |
|
|
*/ |
655 |
|
|
if (nbrp && (nbrp->flags & F_NBRP_GTSM)) |
656 |
|
|
return (nbrp->gtsm_enabled); |
657 |
|
|
|
658 |
|
|
if ((ldp_af_conf_get(leconf, nbr->af))->flags & F_LDPD_AF_NO_GTSM) |
659 |
|
|
return (0); |
660 |
|
|
|
661 |
|
|
/* By default, GTSM support has to be negotiated for LDPv4 */ |
662 |
|
|
if (nbr->af == AF_INET && !(nbr->flags & F_NBR_GTSM_NEGOTIATED)) |
663 |
|
|
return (0); |
664 |
|
|
|
665 |
|
|
return (1); |
666 |
|
|
} |
667 |
|
|
|
668 |
|
|
int |
669 |
|
|
nbr_gtsm_setup(int fd, int af, struct nbr_params *nbrp) |
670 |
|
|
{ |
671 |
|
|
int ttl = 255; |
672 |
|
|
|
673 |
|
|
if (nbrp && (nbrp->flags & F_NBRP_GTSM_HOPS)) |
674 |
|
|
ttl = 256 - nbrp->gtsm_hops; |
675 |
|
|
|
676 |
|
|
switch (af) { |
677 |
|
|
case AF_INET: |
678 |
|
|
if (sock_set_ipv4_minttl(fd, ttl) == -1) |
679 |
|
|
return (-1); |
680 |
|
|
ttl = 255; |
681 |
|
|
if (sock_set_ipv4_ucast_ttl(fd, ttl) == -1) |
682 |
|
|
return (-1); |
683 |
|
|
break; |
684 |
|
|
case AF_INET6: |
685 |
|
|
if (sock_set_ipv6_minhopcount(fd, ttl) == -1) |
686 |
|
|
return (-1); |
687 |
|
|
ttl = 255; |
688 |
|
|
if (sock_set_ipv6_ucast_hops(fd, ttl) == -1) |
689 |
|
|
return (-1); |
690 |
|
|
break; |
691 |
|
|
default: |
692 |
|
|
fatalx("nbr_gtsm_setup: unknown af"); |
693 |
|
|
} |
694 |
|
|
|
695 |
|
|
return (0); |
696 |
|
|
} |
697 |
|
|
|
698 |
|
|
int |
699 |
|
|
nbr_gtsm_check(int fd, struct nbr *nbr, struct nbr_params *nbrp) |
700 |
|
|
{ |
701 |
|
|
if (!nbr_gtsm_enabled(nbr, nbrp)) { |
702 |
|
|
switch (nbr->af) { |
703 |
|
|
case AF_INET: |
704 |
|
|
sock_set_ipv4_ucast_ttl(fd, -1); |
705 |
|
|
break; |
706 |
|
|
case AF_INET6: |
707 |
|
|
/* |
708 |
|
|
* Send packets with a Hop Limit of 255 even when GSTM |
709 |
|
|
* is disabled to guarantee interoperability. |
710 |
|
|
*/ |
711 |
|
|
sock_set_ipv6_ucast_hops(fd, 255); |
712 |
|
|
break; |
713 |
|
|
default: |
714 |
|
|
fatalx("nbr_gtsm_check: unknown af"); |
715 |
|
|
break; |
716 |
|
|
} |
717 |
|
|
return (0); |
718 |
|
|
} |
719 |
|
|
|
720 |
|
|
if (nbr_gtsm_setup(fd, nbr->af, nbrp) == -1) { |
721 |
|
|
log_warnx("%s: error enabling GTSM for lsr-id %s", __func__, |
722 |
|
|
inet_ntoa(nbr->id)); |
723 |
|
|
return (-1); |
724 |
|
|
} |
725 |
|
|
|
726 |
|
|
return (0); |
727 |
|
|
} |
728 |
|
|
|
729 |
|
|
static int |
730 |
|
|
nbr_act_session_operational(struct nbr *nbr) |
731 |
|
|
{ |
732 |
|
|
struct lde_nbr lde_nbr; |
733 |
|
|
|
734 |
|
|
nbr->idtimer_cnt = 0; |
735 |
|
|
|
736 |
|
|
/* this is necessary to avoid ipc synchronization issues */ |
737 |
|
|
nbr_update_peerid(nbr); |
738 |
|
|
|
739 |
|
|
memset(&lde_nbr, 0, sizeof(lde_nbr)); |
740 |
|
|
lde_nbr.id = nbr->id; |
741 |
|
|
lde_nbr.v4_enabled = nbr->v4_enabled; |
742 |
|
|
lde_nbr.v6_enabled = nbr->v6_enabled; |
743 |
|
|
lde_nbr.flags = nbr->flags; |
744 |
|
|
return (ldpe_imsg_compose_lde(IMSG_NEIGHBOR_UP, nbr->peerid, 0, |
745 |
|
|
&lde_nbr, sizeof(lde_nbr))); |
746 |
|
|
} |
747 |
|
|
|
748 |
|
|
static void |
749 |
|
|
nbr_send_labelmappings(struct nbr *nbr) |
750 |
|
|
{ |
751 |
|
|
ldpe_imsg_compose_lde(IMSG_LABEL_MAPPING_FULL, nbr->peerid, 0, |
752 |
|
|
NULL, 0); |
753 |
|
|
} |
754 |
|
|
|
755 |
|
|
struct nbr_params * |
756 |
|
|
nbr_params_new(struct in_addr lsr_id) |
757 |
|
|
{ |
758 |
|
|
struct nbr_params *nbrp; |
759 |
|
|
|
760 |
|
|
if ((nbrp = calloc(1, sizeof(*nbrp))) == NULL) |
761 |
|
|
fatal(__func__); |
762 |
|
|
|
763 |
|
|
nbrp->lsr_id = lsr_id; |
764 |
|
|
nbrp->auth.method = AUTH_NONE; |
765 |
|
|
|
766 |
|
|
return (nbrp); |
767 |
|
|
} |
768 |
|
|
|
769 |
|
|
struct nbr_params * |
770 |
|
|
nbr_params_find(struct ldpd_conf *xconf, struct in_addr lsr_id) |
771 |
|
|
{ |
772 |
|
|
struct nbr_params *nbrp; |
773 |
|
|
|
774 |
|
|
LIST_FOREACH(nbrp, &xconf->nbrp_list, entry) |
775 |
|
|
if (nbrp->lsr_id.s_addr == lsr_id.s_addr) |
776 |
|
|
return (nbrp); |
777 |
|
|
|
778 |
|
|
return (NULL); |
779 |
|
|
} |
780 |
|
|
|
781 |
|
|
uint16_t |
782 |
|
|
nbr_get_keepalive(int af, struct in_addr lsr_id) |
783 |
|
|
{ |
784 |
|
|
struct nbr_params *nbrp; |
785 |
|
|
|
786 |
|
|
nbrp = nbr_params_find(leconf, lsr_id); |
787 |
|
|
if (nbrp && (nbrp->flags & F_NBRP_KEEPALIVE)) |
788 |
|
|
return (nbrp->keepalive); |
789 |
|
|
|
790 |
|
|
return ((ldp_af_conf_get(leconf, af))->keepalive); |
791 |
|
|
} |
792 |
|
|
|
793 |
|
|
struct ctl_nbr * |
794 |
|
|
nbr_to_ctl(struct nbr *nbr) |
795 |
|
|
{ |
796 |
|
|
static struct ctl_nbr nctl; |
797 |
|
|
struct timeval now; |
798 |
|
|
|
799 |
|
|
nctl.af = nbr->af; |
800 |
|
|
nctl.id = nbr->id; |
801 |
|
|
nctl.laddr = nbr->laddr; |
802 |
|
|
nctl.raddr = nbr->raddr; |
803 |
|
|
nctl.nbr_state = nbr->state; |
804 |
|
|
|
805 |
|
|
gettimeofday(&now, NULL); |
806 |
|
|
if (nbr->state == NBR_STA_OPER) { |
807 |
|
|
nctl.uptime = now.tv_sec - nbr->uptime; |
808 |
|
|
} else |
809 |
|
|
nctl.uptime = 0; |
810 |
|
|
|
811 |
|
|
return (&nctl); |
812 |
|
|
} |
813 |
|
|
|
814 |
|
|
void |
815 |
|
|
nbr_clear_ctl(struct ctl_nbr *nctl) |
816 |
|
|
{ |
817 |
|
|
struct nbr *nbr; |
818 |
|
|
|
819 |
|
|
RB_FOREACH(nbr, nbr_addr_head, &nbrs_by_addr) { |
820 |
|
|
if (ldp_addrisset(nctl->af, &nctl->raddr) && |
821 |
|
|
ldp_addrcmp(nctl->af, &nctl->raddr, &nbr->raddr)) |
822 |
|
|
continue; |
823 |
|
|
|
824 |
|
|
log_debug("%s: neighbor %s manually cleared", __func__, |
825 |
|
|
log_addr(nbr->af, &nbr->raddr)); |
826 |
|
|
session_shutdown(nbr, S_SHUTDOWN, 0, 0); |
827 |
|
|
} |
828 |
|
|
} |