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|
/* $OpenBSD: neighbor.c,v 1.13 2010/05/19 15:28:51 claudio Exp $ */
/*
* Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
* Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
* Copyright (c) 2004, 2005, 2008 Esben Norby <norby@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <ctype.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <event.h>
#include <unistd.h>
#include "ldpd.h"
#include "ldp.h"
#include "ldpe.h"
#include "log.h"
#include "lde.h"
int nbr_establish_connection(struct nbr *);
void nbr_send_labelmappings(struct nbr *);
LIST_HEAD(nbr_head, nbr);
struct nbr_table {
struct nbr_head *hashtbl;
u_int32_t hashmask;
} nbrtable;
#define NBR_HASH(x) \
&nbrtable.hashtbl[(x) & nbrtable.hashmask]
u_int32_t peercnt = NBR_CNTSTART;
extern struct ldpd_conf *leconf;
struct {
int state;
enum nbr_event event;
enum nbr_action action;
int new_state;
} nbr_fsm_tbl[] = {
/* current state event that happened action to take resulting state */
/* Discovery States */
{NBR_STA_DOWN, NBR_EVT_HELLO_RCVD, NBR_ACT_STRT_ITIMER, NBR_STA_PRESENT},
{NBR_STA_UP, NBR_EVT_HELLO_RCVD, NBR_ACT_RST_ITIMER, 0},
/* Passive Role */
{NBR_STA_PRESENT, NBR_EVT_SESSION_UP, NBR_ACT_SESSION_EST, NBR_STA_INITIAL},
{NBR_STA_INITIAL, NBR_EVT_INIT_RCVD, NBR_ACT_INIT_SEND, NBR_STA_OPENREC},
{NBR_STA_OPENREC, NBR_EVT_KEEPALIVE_RCVD, NBR_ACT_STRT_KTIMER, NBR_STA_OPER},
/* Active Role */
{NBR_STA_PRESENT, NBR_EVT_INIT_SENT, NBR_ACT_NOTHING, NBR_STA_OPENSENT},
{NBR_STA_OPENSENT, NBR_EVT_INIT_RCVD, NBR_ACT_KEEPALIVE_SEND, NBR_STA_OPER},
/* Session Maintenance */
{NBR_STA_OPER, NBR_EVT_PDU_RCVD, NBR_ACT_RST_KTIMEOUT, 0},
/* Session Close */
{NBR_STA_SESSION, NBR_EVT_CLOSE_SESSION, NBR_ACT_CLOSE_SESSION, NBR_STA_PRESENT},
{NBR_STA_UP, NBR_EVT_DOWN, NBR_ACT_CLOSE_SESSION, },
{-1, NBR_EVT_NOTHING, NBR_ACT_NOTHING, 0},
};
const char * const nbr_event_names[] = {
"NOTHING",
"HELLO RECEIVED",
"SESSION UP",
"SESSION CLOSE",
"INIT RECEIVED",
"KEEPALIVE RECEIVED",
"PDU RECEIVED",
"INIT SENT",
"DOWN"
};
const char * const nbr_action_names[] = {
"NOTHING",
"START INACTIVITY TIMER",
"RESET INACTIVITY TIMER",
"RESET KEEPALIVE TIMEOUT",
"START KEEPALIVE TIMER",
"RESET KEEPALIVE TIMER",
"START NEIGHBOR SESSION",
"SEND INIT",
"SEND KEEPALIVE",
"CLOSE SESSION"
};
int
nbr_fsm(struct nbr *nbr, enum nbr_event event)
{
struct timeval now;
int old_state;
int new_state = 0;
int i, ret = 0;
old_state = nbr->state;
for (i = 0; nbr_fsm_tbl[i].state != -1; i++)
if ((nbr_fsm_tbl[i].state & old_state) &&
(nbr_fsm_tbl[i].event == event)) {
new_state = nbr_fsm_tbl[i].new_state;
break;
}
if (nbr_fsm_tbl[i].state == -1) {
/* event outside of the defined fsm, ignore it. */
log_warnx("nbr_fsm: neighbor ID %s, "
"event %s not expected in state %s",
inet_ntoa(nbr->id), nbr_event_names[event],
nbr_state_name(old_state));
return (0);
}
ret = 0;
switch (nbr_fsm_tbl[i].action) {
case NBR_ACT_RST_ITIMER:
nbr_reset_itimer(nbr);
break;
case NBR_ACT_STRT_ITIMER:
nbr_start_itimer(nbr);
break;
case NBR_ACT_RST_KTIMEOUT:
nbr_reset_ktimeout(nbr);
break;
case NBR_ACT_RST_KTIMER:
nbr_reset_ktimer(nbr);
break;
case NBR_ACT_STRT_KTIMER:
nbr_start_ktimer(nbr);
nbr_start_ktimeout(nbr);
send_address(nbr, NULL);
nbr_send_labelmappings(nbr);
break;
case NBR_ACT_SESSION_EST:
ret = nbr_act_session_establish(nbr, 0);
break;
case NBR_ACT_INIT_SEND:
send_init(nbr);
send_keepalive(nbr);
break;
case NBR_ACT_KEEPALIVE_SEND:
nbr_start_ktimer(nbr);
nbr_start_ktimeout(nbr);
send_keepalive(nbr);
send_address(nbr, NULL);
nbr_send_labelmappings(nbr);
break;
case NBR_ACT_CLOSE_SESSION:
session_close(nbr);
nbr_start_idtimer(nbr);
break;
case NBR_ACT_NOTHING:
/* do nothing */
break;
}
if (ret) {
log_warnx("nbr_fsm: error changing state for neighbor ID %s, "
"event %s, state %s", inet_ntoa(nbr->id),
nbr_event_names[event], nbr_state_name(old_state));
return (-1);
}
if (new_state != 0)
nbr->state = new_state;
if (old_state != nbr->state) {
log_debug("nbr_fsm: event %s resulted in action %s and "
"changing state for neighbor ID %s from %s to %s",
nbr_event_names[event],
nbr_action_names[nbr_fsm_tbl[i].action],
inet_ntoa(nbr->id), nbr_state_name(old_state),
nbr_state_name(nbr->state));
if (nbr->state == NBR_STA_OPER) {
gettimeofday(&now, NULL);
nbr->uptime = now.tv_sec;
}
}
return (ret);
}
void
nbr_init(u_int32_t hashsize)
{
u_int32_t hs, i;
for (hs = 1; hs < hashsize; hs <<= 1)
;
nbrtable.hashtbl = calloc(hs, sizeof(struct nbr_head));
if (nbrtable.hashtbl == NULL)
fatal("nbr_init");
for (i = 0; i < hs; i++)
LIST_INIT(&nbrtable.hashtbl[i]);
nbrtable.hashmask = hs - 1;
}
struct nbr *
nbr_new(u_int32_t nbr_id, u_int16_t lspace, struct iface *iface)
{
struct nbr_head *head;
struct nbr *nbr;
struct lde_nbr rn;
if ((nbr = calloc(1, sizeof(*nbr))) == NULL)
fatal("nbr_new");
nbr->state = NBR_STA_DOWN;
nbr->id.s_addr = nbr_id;
nbr->lspace = lspace;
/* get next unused peerid */
while (nbr_find_peerid(++peercnt))
;
nbr->peerid = peercnt;
head = NBR_HASH(nbr->peerid);
LIST_INSERT_HEAD(head, nbr, hash);
/* add to peer list */
nbr->iface = iface;
LIST_INSERT_HEAD(&iface->nbr_list, nbr, entry);
TAILQ_INIT(&nbr->mapping_list);
TAILQ_INIT(&nbr->withdraw_list);
TAILQ_INIT(&nbr->request_list);
TAILQ_INIT(&nbr->release_list);
TAILQ_INIT(&nbr->abortreq_list);
/* set event structures */
evtimer_set(&nbr->inactivity_timer, nbr_itimer, nbr);
evtimer_set(&nbr->keepalive_timeout, nbr_ktimeout, nbr);
evtimer_set(&nbr->keepalive_timer, nbr_ktimer, nbr);
evtimer_set(&nbr->initdelay_timer, nbr_idtimer, nbr);
bzero(&rn, sizeof(rn));
rn.id.s_addr = nbr->id.s_addr;
rn.lspace = nbr->lspace;
rn.ifindex = nbr->iface->ifindex;
ldpe_imsg_compose_lde(IMSG_NEIGHBOR_UP, nbr->peerid, 0, &rn,
sizeof(rn));
return (nbr);
}
void
nbr_del(struct nbr *nbr)
{
ldpe_imsg_compose_lde(IMSG_NEIGHBOR_DOWN, nbr->peerid, 0, NULL, 0);
session_close(nbr);
if (evtimer_pending(&nbr->inactivity_timer, NULL))
evtimer_del(&nbr->inactivity_timer);
if (evtimer_pending(&nbr->keepalive_timer, NULL))
evtimer_del(&nbr->keepalive_timer);
if (evtimer_pending(&nbr->keepalive_timeout, NULL))
evtimer_del(&nbr->keepalive_timeout);
if (evtimer_pending(&nbr->initdelay_timer, NULL))
evtimer_del(&nbr->initdelay_timer);
nbr_mapping_list_clr(nbr, &nbr->mapping_list);
LIST_REMOVE(nbr, entry);
LIST_REMOVE(nbr, hash);
free(nbr->rbuf);
free(nbr);
}
struct nbr *
nbr_find_peerid(u_int32_t peerid)
{
struct nbr_head *head;
struct nbr *nbr;
head = NBR_HASH(peerid);
LIST_FOREACH(nbr, head, hash) {
if (nbr->peerid == peerid)
return (nbr);
}
return (NULL);
}
struct nbr *
nbr_find_ip(struct iface *iface, u_int32_t rtr_id)
{
struct nbr *nbr = NULL;
LIST_FOREACH(nbr, &iface->nbr_list, entry) {
if (nbr->addr.s_addr == rtr_id)
return (nbr);
}
return (NULL);
}
struct nbr *
nbr_find_ldpid(struct iface *iface, u_int32_t rtr_id, u_int16_t lspace)
{
struct nbr *nbr = NULL;
LIST_FOREACH(nbr, &iface->nbr_list, entry) {
if (nbr->id.s_addr == rtr_id && nbr->lspace == lspace)
return (nbr);
}
return (NULL);
}
/* timers */
/* Inactivity timer: timeout based on hellos */
/* ARGSUSED */
void
nbr_itimer(int fd, short event, void *arg)
{
struct nbr *nbr = arg;
log_debug("nbr_itimer: neighbor ID %s peerid %lu", inet_ntoa(nbr->id),
nbr->peerid);
nbr_del(nbr);
}
void
nbr_start_itimer(struct nbr *nbr)
{
struct timeval tv;
timerclear(&tv);
tv.tv_sec = nbr->holdtime;
if (evtimer_add(&nbr->inactivity_timer, &tv) == -1)
fatal("nbr_start_itimer");
}
void
nbr_stop_itimer(struct nbr *nbr)
{
if (evtimer_del(&nbr->inactivity_timer) == -1)
fatal("nbr_stop_itimer");
}
void
nbr_reset_itimer(struct nbr *nbr)
{
struct timeval tv;
timerclear(&tv);
tv.tv_sec = nbr->holdtime;
if (evtimer_add(&nbr->inactivity_timer, &tv) == -1)
fatal("nbr_reset_itimer");
}
/* Keepalive timer: timer to send keepalive message to neighbors */
void
nbr_ktimer(int fd, short event, void *arg)
{
struct nbr *nbr = arg;
struct timeval tv;
send_keepalive(nbr);
timerclear(&tv);
tv.tv_sec = (time_t)(nbr->keepalive / KEEPALIVE_PER_PERIOD);
if (evtimer_add(&nbr->keepalive_timer, &tv) == -1)
fatal("nbr_ktimer");
}
void
nbr_start_ktimer(struct nbr *nbr)
{
struct timeval tv;
timerclear(&tv);
/* XXX: just to be sure it will send three keepalives per period */
tv.tv_sec = (time_t)(nbr->keepalive / KEEPALIVE_PER_PERIOD);
if (evtimer_add(&nbr->keepalive_timer, &tv) == -1)
fatal("nbr_start_ktimer");
}
void
nbr_stop_ktimer(struct nbr *nbr)
{
if (evtimer_del(&nbr->keepalive_timer) == -1)
fatal("nbr_stop_ktimer");
}
void
nbr_reset_ktimer(struct nbr *nbr)
{
struct timeval tv;
timerclear(&tv);
/* XXX: just to be sure it will send three keepalives per period */
tv.tv_sec = (time_t)(nbr->keepalive / KEEPALIVE_PER_PERIOD);
if (evtimer_add(&nbr->keepalive_timer, &tv) == -1)
fatal("nbr_reset_ktimer");
}
/* Keepalive timeout: if the nbr hasn't sent keepalive */
void
nbr_ktimeout(int fd, short event, void *arg)
{
struct nbr *nbr = arg;
log_debug("nbr_ktimeout: neighbor ID %s peerid %lu", inet_ntoa(nbr->id),
nbr->peerid);
send_notification_nbr(nbr, S_KEEPALIVE_TMR, 0, 0);
/* XXX race, send_notification_nbr() has no chance to be sent */
session_close(nbr);
}
void
nbr_start_ktimeout(struct nbr *nbr)
{
struct timeval tv;
timerclear(&tv);
tv.tv_sec = nbr->keepalive;
if (evtimer_add(&nbr->keepalive_timeout, &tv) == -1)
fatal("nbr_start_ktimeout");
}
void
nbr_stop_ktimeout(struct nbr *nbr)
{
if (evtimer_del(&nbr->keepalive_timeout) == -1)
fatal("nbr_stop_ktimeout");
}
void
nbr_reset_ktimeout(struct nbr *nbr)
{
struct timeval tv;
timerclear(&tv);
tv.tv_sec = nbr->keepalive;
if (evtimer_add(&nbr->keepalive_timeout, &tv) == -1)
fatal("nbr_reset_ktimeout");
}
/* Init delay timer: timer to retry to iniziatize session */
void
nbr_idtimer(int fd, short event, void *arg)
{
struct nbr *nbr = arg;
log_debug("nbr_idtimer: neighbor ID %s peerid %lu", inet_ntoa(nbr->id),
nbr->peerid);
nbr_act_session_establish(nbr, 1);
}
void
nbr_start_idtimer(struct nbr *nbr)
{
struct timeval tv;
timerclear(&tv);
tv.tv_sec = INIT_DELAY_TMR;
if (evtimer_add(&nbr->initdelay_timer, &tv) == -1)
fatal("nbr_start_idtimer");
}
void
nbr_stop_idtimer(struct nbr *nbr)
{
if (evtimer_del(&nbr->initdelay_timer) == -1)
fatal("nbr_stop_idtimer");
}
int
nbr_pending_idtimer(struct nbr *nbr)
{
if (evtimer_pending(&nbr->initdelay_timer, NULL))
return (1);
return (0);
}
void
nbr_reset_idtimer(struct nbr *nbr)
{
struct timeval tv;
timerclear(&tv);
tv.tv_sec = INIT_DELAY_TMR;
if (evtimer_add(&nbr->initdelay_timer, &tv) == -1)
fatal("nbr_reset_idtimer");
}
int
nbr_establish_connection(struct nbr *nbr)
{
struct sockaddr_in in;
bzero(&in, sizeof(in));
in.sin_family = AF_INET;
in.sin_port = htons(LDP_PORT);
in.sin_addr.s_addr = nbr->addr.s_addr;
nbr->fd = socket(AF_INET, SOCK_STREAM, 0);
if (nbr->fd == -1) {
log_debug("nbr_establish_connection: error while "
"creating socket");
return (-1);
}
if (connect(nbr->fd, (struct sockaddr *)&in, sizeof(in)) == -1) {
log_debug("nbr_establish_connection: error while "
"connecting to %s", inet_ntoa(nbr->addr));
nbr_start_idtimer(nbr);
close(nbr->fd);
return (-1);
}
return (0);
}
int
nbr_act_session_establish(struct nbr *nbr, int active)
{
if (active) {
if (nbr_establish_connection(nbr) < 0)
return (-1);
}
evbuf_init(&nbr->wbuf, nbr->fd, session_write, nbr);
event_set(&nbr->rev, nbr->fd, EV_READ | EV_PERSIST, session_read, nbr);
event_add(&nbr->rev, NULL);
if (active) {
send_init(nbr);
nbr_fsm(nbr, NBR_EVT_INIT_SENT);
}
return (0);
}
void
nbr_send_labelmappings(struct nbr *nbr)
{
if (leconf->mode & MODE_ADV_UNSOLICITED) {
ldpe_imsg_compose_lde(IMSG_LABEL_MAPPING_FULL, nbr->peerid, 0,
NULL, 0);
}
}
void
nbr_mapping_add(struct nbr *nbr, struct mapping_head *mh, struct map *map)
{
struct mapping_entry *me;
me = calloc(1, sizeof(*me));
if (me == NULL)
fatal("nbr_mapping_add");
me->prefix = map->prefix;
me->prefixlen = map->prefixlen;
me->label = map->label;
TAILQ_INSERT_TAIL(mh, me, entry);
}
struct mapping_entry *
nbr_mapping_find(struct nbr *nbr, struct mapping_head *mh, struct map *map)
{
struct mapping_entry *me = NULL;
TAILQ_FOREACH(me, mh, entry) {
if (me->prefix == map->prefix &&
me->prefixlen == map->prefixlen)
return (me);
}
return (NULL);
}
void
nbr_mapping_del(struct nbr *nbr, struct mapping_head *mh, struct map *map)
{
struct mapping_entry *me;
me = nbr_mapping_find(nbr, mh, map);
if (me == NULL)
return;
TAILQ_REMOVE(mh, me, entry);
free(me);
}
void
nbr_mapping_list_clr(struct nbr *nbr, struct mapping_head *mh)
{
struct mapping_entry *me;
while ((me = TAILQ_FIRST(mh)) != NULL) {
TAILQ_REMOVE(mh, me, entry);
free(me);
}
}
struct ctl_nbr *
nbr_to_ctl(struct nbr *nbr)
{
static struct ctl_nbr nctl;
struct timeval tv, now, res;
memcpy(nctl.name, nbr->iface->name, sizeof(nctl.name));
memcpy(&nctl.id, &nbr->id, sizeof(nctl.id));
memcpy(&nctl.addr, &nbr->addr, sizeof(nctl.addr));
nctl.nbr_state = nbr->state;
nctl.iface_state = nbr->iface->state;
gettimeofday(&now, NULL);
if (evtimer_pending(&nbr->inactivity_timer, &tv)) {
timersub(&tv, &now, &res);
if (nbr->state & NBR_STA_DOWN)
nctl.dead_timer = DEFAULT_NBR_TMOUT - res.tv_sec;
else
nctl.dead_timer = res.tv_sec;
} else
nctl.dead_timer = 0;
if (nbr->state == NBR_STA_OPER) {
nctl.uptime = now.tv_sec - nbr->uptime;
} else
nctl.uptime = 0;
return (&nctl);
}
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