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/* $OpenBSD: rde_mfc.c,v 1.2 2006/12/03 20:14:37 michele Exp $ */
/*
* Copyright (c) 2006 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/socket.h>
#include <sys/tree.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <err.h>
#include <stdlib.h>
#include "igmp.h"
#include "dvmrp.h"
#include "dvmrpd.h"
#include "log.h"
#include "dvmrpe.h"
#include "rde.h"
/* multicast forwarding cache */
void mfc_invalidate(void);
void mfc_expire_timer(int, short, void *);
int mfc_start_expire_timer(struct mfc_node *);
int mfc_compare(struct mfc_node *, struct mfc_node *);
RB_HEAD(mfc_tree, mfc_node) mfc;
RB_PROTOTYPE(mfc_tree, mfc_node, entry, mfc_compare)
RB_GENERATE(mfc_tree, mfc_node, entry, mfc_compare)
extern struct dvmrpd_conf *rdeconf;
/* timers */
void
mfc_expire_timer(int fd, short event, void *arg)
{
struct mfc_node *mn = arg;
struct mfc nmfc;
log_debug("mfc_expire_timer: group %s", inet_ntoa(mn->group));
/* remove route entry */
nmfc.origin = mn->origin;
nmfc.group = mn->group;
rde_imsg_compose_parent(IMSG_MFC_DEL, 0, &nmfc, sizeof(nmfc));
event_del(&mn->expiration_timer);
mfc_remove(mn);
}
int
mfc_start_expire_timer(struct mfc_node *mn)
{
struct timeval tv;
timerclear(&tv);
tv.tv_sec = ROUTE_EXPIRATION_TIME;
return (evtimer_add(&mn->expiration_timer, &tv));
}
/* route table */
void
mfc_init(void)
{
RB_INIT(&mfc);
}
int
mfc_compare(struct mfc_node *a, struct mfc_node *b)
{
if (ntohl(a->origin.s_addr) < ntohl(b->origin.s_addr))
return (-1);
if (ntohl(a->origin.s_addr) > ntohl(b->origin.s_addr))
return (1);
if (ntohl(a->group.s_addr) < ntohl(b->group.s_addr))
return (-1);
if (ntohl(a->group.s_addr) > ntohl(b->group.s_addr))
return (1);
return (0);
}
struct mfc_node *
mfc_find(in_addr_t origin, in_addr_t group)
{
struct mfc_node s;
s.origin.s_addr = origin;
s.group.s_addr = group;
return (RB_FIND(mfc_tree, &mfc, &s));
}
int
mfc_insert(struct mfc_node *m)
{
if (RB_INSERT(mfc_tree, &mfc, m) != NULL) {
log_warnx("mfc_insert failed for group %s",
inet_ntoa(m->group));
free(m);
return (-1);
}
return (0);
}
int
mfc_remove(struct mfc_node *m)
{
if (RB_REMOVE(mfc_tree, &mfc, m) == NULL) {
log_warnx("mfc_remove failed for group %s",
inet_ntoa(m->group));
return (-1);
}
free(m);
return (0);
}
void
mfc_clear(void)
{
struct mfc_node *m;
while ((m = RB_MIN(mfc_tree, &mfc)) != NULL)
mfc_remove(m);
}
void
mfc_dump(pid_t pid)
{
static struct ctl_mfc mfcctl;
struct timespec now;
struct timeval tv, now2, res;
struct mfc_node *mn;
int i;
clock_gettime(CLOCK_MONOTONIC, &now);
RB_FOREACH(mn, mfc_tree, &mfc) {
mfcctl.origin.s_addr = mn->origin.s_addr;
mfcctl.group.s_addr = mn->group.s_addr;
mfcctl.uptime = now.tv_sec - mn->uptime;
mfcctl.ifindex = mn->ifindex;
for (i = 0; i < MAXVIFS; i ++) {
mfcctl.ttls[i] = mn->ttls[i];
}
gettimeofday(&now2, NULL);
if (evtimer_pending(&mn->expiration_timer, &tv)) {
timersub(&tv, &now2, &res);
mfcctl.expire = res.tv_sec;
} else
mfcctl.expire = -1;
rde_imsg_compose_dvmrpe(IMSG_CTL_SHOW_MFC, 0, pid, &mfcctl,
sizeof(mfcctl));
}
}
void
mfc_update(struct mfc *nmfc)
{
struct timespec now;
struct mfc_node *mn;
int i;
clock_gettime(CLOCK_MONOTONIC, &now);
if ((mn = mfc_find(nmfc->origin.s_addr, nmfc->group.s_addr)) == NULL) {
if ((mn = calloc(1, sizeof(struct mfc_node))) == NULL)
fatalx("mfc_update");
mn->origin.s_addr = nmfc->origin.s_addr;
mn->group.s_addr = nmfc->group.s_addr;
mn->ifindex = nmfc->ifindex;
mn->uptime = now.tv_sec;
for (i = 0; i < MAXVIFS; i++)
mn->ttls[i] = nmfc->ttls[i];
if (mfc_insert(mn) == 0) {
if (nmfc->origin.s_addr != 0)
rde_imsg_compose_parent(IMSG_MFC_ADD, 0, nmfc,
sizeof(*nmfc));
}
evtimer_set(&mn->expiration_timer, mfc_expire_timer, mn);
mfc_start_expire_timer(mn);
}
}
void
mfc_delete(struct mfc *nmfc)
{
struct mfc_node *mn;
if ((mn = mfc_find(nmfc->origin.s_addr, nmfc->group.s_addr)) == NULL)
return;
/* XXX decide if it should really be removed */
mfc_remove(mn);
/* XXX notify parent */
}
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