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/* $OpenBSD: neighbor.c,v 1.10 2016/09/02 16:44:33 renato Exp $ */
/*
* Copyright (c) 2015 Renato Westphal <renato@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 <string.h>
#include <stdlib.h>
#include "eigrpd.h"
#include "eigrpe.h"
#include "rde.h"
#include "log.h"
static __inline int nbr_compare(struct nbr *, struct nbr *);
static __inline int nbr_pid_compare(struct nbr *, struct nbr *);
static void nbr_update_peerid(struct nbr *);
static void nbr_timeout(int, short, void *);
static void nbr_stop_timeout(struct nbr *);
RB_GENERATE(nbr_addr_head, nbr, addr_tree, nbr_compare)
RB_GENERATE(nbr_pid_head, nbr, pid_tree, nbr_pid_compare)
struct nbr_pid_head nbrs_by_pid = RB_INITIALIZER(&nbrs_by_pid);
static __inline int
nbr_compare(struct nbr *a, struct nbr *b)
{
if (a->ei->iface->ifindex < b->ei->iface->ifindex)
return (-1);
if (a->ei->iface->ifindex > b->ei->iface->ifindex)
return (1);
return (eigrp_addrcmp(a->ei->eigrp->af, &a->addr, &b->addr));
}
static __inline int
nbr_pid_compare(struct nbr *a, struct nbr *b)
{
return (a->peerid - b->peerid);
}
struct nbr *
nbr_new(struct eigrp_iface *ei, union eigrpd_addr *addr, uint16_t holdtime,
int self)
{
struct eigrp *eigrp = ei->eigrp;
struct nbr *nbr;
if (!self)
log_debug("%s: interface %s addr %s as %u", __func__,
ei->iface->name, log_addr(eigrp->af, addr), eigrp->as);
if ((nbr = calloc(1, sizeof(*nbr))) == NULL)
fatal("nbr_new");
nbr->ei = ei;
TAILQ_INSERT_TAIL(&ei->nbr_list, nbr, entry);
nbr->addr = *addr;
nbr->peerid = 0;
nbr->hello_holdtime = holdtime;
nbr->flags = F_EIGRP_NBR_PENDING;
if (self)
nbr->flags |= F_EIGRP_NBR_SELF;
TAILQ_INIT(&nbr->update_list);
TAILQ_INIT(&nbr->query_list);
TAILQ_INIT(&nbr->reply_list);
TAILQ_INIT(&nbr->retrans_list);
if (RB_INSERT(nbr_addr_head, &eigrp->nbrs, nbr) != NULL)
fatalx("nbr_new: RB_INSERT(eigrp->nbrs) failed");
/* timeout handling */
if (!self) {
evtimer_set(&nbr->ev_ack, rtp_ack_timer, nbr);
evtimer_set(&nbr->ev_hello_timeout, nbr_timeout, nbr);
nbr_start_timeout(nbr);
}
return (nbr);
}
void
nbr_init(struct nbr *nbr)
{
struct timeval now;
struct rde_nbr rnbr;
nbr->flags &= ~F_EIGRP_NBR_PENDING;
gettimeofday(&now, NULL);
nbr->uptime = now.tv_sec;
nbr_update_peerid(nbr);
memset(&rnbr, 0, sizeof(rnbr));
rnbr.addr = nbr->addr;
rnbr.ifaceid = nbr->ei->ifaceid;
if (nbr->flags & F_EIGRP_NBR_SELF)
rnbr.flags = F_RDE_NBR_SELF|F_RDE_NBR_LOCAL;
/* rde is not aware of pending nbrs */
eigrpe_imsg_compose_rde(IMSG_NEIGHBOR_UP, nbr->peerid, 0, &rnbr,
sizeof(rnbr));
}
void
nbr_del(struct nbr *nbr)
{
struct eigrp *eigrp = nbr->ei->eigrp;
struct packet *pkt;
if (!(nbr->flags & F_EIGRP_NBR_SELF))
log_debug("%s: addr %s", __func__,
log_addr(eigrp->af, &nbr->addr));
eigrpe_imsg_compose_rde(IMSG_NEIGHBOR_DOWN, nbr->peerid, 0, NULL, 0);
nbr_stop_timeout(nbr);
/* clear retransmission list */
while ((pkt = TAILQ_FIRST(&nbr->retrans_list)) != NULL)
rtp_packet_del(pkt);
if (nbr->peerid)
RB_REMOVE(nbr_pid_head, &nbrs_by_pid, nbr);
RB_REMOVE(nbr_addr_head, &eigrp->nbrs, nbr);
TAILQ_REMOVE(&nbr->ei->nbr_list, nbr, entry);
free(nbr);
}
static void
nbr_update_peerid(struct nbr *nbr)
{
static uint32_t peercnt = NBR_CNTSTART;
if (nbr->peerid)
RB_REMOVE(nbr_pid_head, &nbrs_by_pid, nbr);
/* get next unused peerid */
while (nbr_find_peerid(++peercnt))
;
nbr->peerid = peercnt;
if (RB_INSERT(nbr_pid_head, &nbrs_by_pid, nbr) != NULL)
fatalx("nbr_new: RB_INSERT(nbrs_by_pid) failed");
}
struct nbr *
nbr_find(struct eigrp_iface *ei, union eigrpd_addr *addr)
{
struct nbr n;
struct eigrp_iface i;
struct eigrp e;
e.af = ei->eigrp->af;
e.as = ei->eigrp->as;
i.eigrp = &e;
i.iface = ei->iface;
n.ei = &i;
n.addr = *addr;
return (RB_FIND(nbr_addr_head, &ei->eigrp->nbrs, &n));
}
struct nbr *
nbr_find_peerid(uint32_t peerid)
{
struct nbr n;
n.peerid = peerid;
return (RB_FIND(nbr_pid_head, &nbrs_by_pid, &n));
}
struct ctl_nbr *
nbr_to_ctl(struct nbr *nbr)
{
static struct ctl_nbr nctl;
struct timeval now;
nctl.af = nbr->ei->eigrp->af;
nctl.as = nbr->ei->eigrp->as;
memcpy(nctl.ifname, nbr->ei->iface->name, sizeof(nctl.ifname));
nctl.addr = nbr->addr;
nctl.hello_holdtime = nbr->hello_holdtime;
gettimeofday(&now, NULL);
nctl.uptime = now.tv_sec - nbr->uptime;
return (&nctl);
}
void
nbr_clear_ctl(struct ctl_nbr *nctl)
{
struct eigrp *eigrp;
struct nbr *nbr, *safe;
TAILQ_FOREACH(eigrp, &econf->instances, entry) {
if (nctl->af && nctl->af != eigrp->af)
continue;
if (nctl->as && nctl->as != eigrp->as)
continue;
RB_FOREACH_SAFE(nbr, nbr_addr_head, &eigrp->nbrs, safe) {
if (nbr->flags & (F_EIGRP_NBR_PENDING|F_EIGRP_NBR_SELF))
continue;
if (eigrp_addrisset(nctl->af, &nctl->addr) &&
eigrp_addrcmp(nctl->af, &nctl->addr, &nbr->addr))
continue;
log_debug("%s: neighbor %s manually cleared", __func__,
log_addr(nbr->ei->eigrp->af, &nbr->addr));
send_peerterm(nbr);
nbr_del(nbr);
}
}
}
/* timers */
/* ARGSUSED */
static void
nbr_timeout(int fd, short event, void *arg)
{
struct nbr *nbr = arg;
struct eigrp *eigrp = nbr->ei->eigrp;
log_debug("%s: neighbor %s", __func__, log_addr(eigrp->af, &nbr->addr));
nbr_del(nbr);
}
void
nbr_start_timeout(struct nbr *nbr)
{
struct timeval tv;
timerclear(&tv);
tv.tv_sec = nbr->hello_holdtime;
if (evtimer_add(&nbr->ev_hello_timeout, &tv) == -1)
fatal("nbr_start_timeout");
}
static void
nbr_stop_timeout(struct nbr *nbr)
{
if (evtimer_pending(&nbr->ev_hello_timeout, NULL) &&
evtimer_del(&nbr->ev_hello_timeout) == -1)
fatal("nbr_stop_timeout");
}
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