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|
/* $OpenBSD: interface.c,v 1.22 2015/03/21 18:32:01 renato Exp $ */
/*
* 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 <net/if_types.h>
#include <fcntl.h>
#include <ctype.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <event.h>
#include "ldpd.h"
#include "ldp.h"
#include "log.h"
#include "ldpe.h"
extern struct ldpd_conf *leconf;
void if_hello_timer(int, short, void *);
void if_start_hello_timer(struct iface *);
void if_stop_hello_timer(struct iface *);
struct iface *
if_new(struct kif *kif)
{
struct iface *iface;
if ((iface = calloc(1, sizeof(*iface))) == NULL)
err(1, "if_new: calloc");
iface->state = IF_STA_DOWN;
strlcpy(iface->name, kif->ifname, sizeof(iface->name));
/* get type */
if (kif->flags & IFF_POINTOPOINT)
iface->type = IF_TYPE_POINTOPOINT;
if (kif->flags & IFF_BROADCAST &&
kif->flags & IFF_MULTICAST)
iface->type = IF_TYPE_BROADCAST;
/* get index and flags */
iface->ifindex = kif->ifindex;
iface->flags = kif->flags;
iface->linkstate = kif->link_state;
iface->media_type = kif->media_type;
return (iface);
}
void
if_del(struct iface *iface)
{
struct if_addr *if_addr;
if (iface->state == IF_STA_ACTIVE)
if_reset(iface);
log_debug("if_del: interface %s", iface->name);
while ((if_addr = LIST_FIRST(&iface->addr_list)) != NULL)
LIST_REMOVE(if_addr, iface_entry);
free(iface);
}
void
if_init(struct ldpd_conf *xconf, struct iface *iface)
{
/* set event handlers for interface */
evtimer_set(&iface->hello_timer, if_hello_timer, iface);
iface->discovery_fd = xconf->ldp_discovery_socket;
}
struct iface *
if_lookup(u_short ifindex)
{
struct iface *iface;
LIST_FOREACH(iface, &leconf->iface_list, entry)
if (iface->ifindex == ifindex)
return (iface);
return (NULL);
}
/* timers */
/* ARGSUSED */
void
if_hello_timer(int fd, short event, void *arg)
{
struct iface *iface = arg;
struct timeval tv;
send_hello(HELLO_LINK, iface, NULL);
/* reschedule hello_timer */
timerclear(&tv);
tv.tv_sec = iface->hello_interval;
if (evtimer_add(&iface->hello_timer, &tv) == -1)
fatal("if_hello_timer");
}
void
if_start_hello_timer(struct iface *iface)
{
struct timeval tv;
send_hello(HELLO_LINK, iface, NULL);
timerclear(&tv);
tv.tv_sec = iface->hello_interval;
if (evtimer_add(&iface->hello_timer, &tv) == -1)
fatal("if_start_hello_timer");
}
void
if_stop_hello_timer(struct iface *iface)
{
if (evtimer_pending(&iface->hello_timer, NULL) &&
evtimer_del(&iface->hello_timer) == -1)
fatal("if_stop_hello_timer");
}
int
if_start(struct iface *iface)
{
struct in_addr addr;
struct timeval now;
log_debug("if_start: %s", iface->name);
gettimeofday(&now, NULL);
iface->uptime = now.tv_sec;
inet_aton(AllRouters, &addr);
if (if_join_group(iface, &addr))
return (-1);
/* hello timer needs to be started in any case */
if_start_hello_timer(iface);
return (0);
}
int
if_reset(struct iface *iface)
{
struct in_addr addr;
struct adj *adj;
log_debug("if_reset: %s", iface->name);
while ((adj = LIST_FIRST(&iface->adj_list)) != NULL) {
LIST_REMOVE(adj, iface_entry);
adj_del(adj);
}
if_stop_hello_timer(iface);
/* try to cleanup */
inet_aton(AllRouters, &addr);
if_leave_group(iface, &addr);
return (0);
}
int
if_update(struct iface *iface)
{
int ret;
if (iface->state == IF_STA_DOWN) {
if (!(iface->flags & IFF_UP) ||
!LINK_STATE_IS_UP(iface->linkstate) ||
LIST_EMPTY(&iface->addr_list))
return (0);
iface->state = IF_STA_ACTIVE;
ret = if_start(iface);
} else {
if ((iface->flags & IFF_UP) &&
LINK_STATE_IS_UP(iface->linkstate) &&
!LIST_EMPTY(&iface->addr_list))
return (0);
iface->state = IF_STA_DOWN;
ret = if_reset(iface);
}
return (ret);
}
struct ctl_iface *
if_to_ctl(struct iface *iface)
{
static struct ctl_iface ictl;
struct timeval now;
struct adj *adj;
memcpy(ictl.name, iface->name, sizeof(ictl.name));
ictl.ifindex = iface->ifindex;
ictl.state = iface->state;
ictl.hello_holdtime = iface->hello_holdtime;
ictl.hello_interval = iface->hello_interval;
ictl.flags = iface->flags;
ictl.type = iface->type;
ictl.linkstate = iface->linkstate;
ictl.mediatype = iface->media_type;
gettimeofday(&now, NULL);
if (iface->state != IF_STA_DOWN &&
iface->uptime != 0) {
ictl.uptime = now.tv_sec - iface->uptime;
} else
ictl.uptime = 0;
ictl.adj_cnt = 0;
LIST_FOREACH(adj, &iface->adj_list, iface_entry)
ictl.adj_cnt++;
return (&ictl);
}
/* misc */
int
if_set_mcast_ttl(int fd, u_int8_t ttl)
{
if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL,
(char *)&ttl, sizeof(ttl)) < 0) {
log_warn("if_set_mcast_ttl: error setting "
"IP_MULTICAST_TTL to %d", ttl);
return (-1);
}
return (0);
}
int
if_set_tos(int fd, int tos)
{
if (setsockopt(fd, IPPROTO_IP, IP_TOS, (int *)&tos, sizeof(tos)) < 0) {
log_warn("if_set_tos: error setting IP_TOS to 0x%x", tos);
return (-1);
}
return (0);
}
int
if_set_recvif(int fd, int enable)
{
if (setsockopt(fd, IPPROTO_IP, IP_RECVIF, &enable,
sizeof(enable)) < 0) {
log_warn("if_set_recvif: error setting IP_RECVIF");
return (-1);
}
return (0);
}
void
if_set_recvbuf(int fd)
{
int bsize;
bsize = 65535;
while (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &bsize,
sizeof(bsize)) == -1)
bsize /= 2;
}
int
if_set_reuse(int fd, int enable)
{
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &enable,
sizeof(int)) < 0) {
log_warn("if_set_reuse: error setting SO_REUSEADDR");
return (-1);
}
return (0);
}
/*
* only one JOIN or DROP per interface and address is allowed so we need
* to keep track of what is added and removed.
*/
struct if_group_count {
LIST_ENTRY(if_group_count) entry;
struct in_addr addr;
unsigned int ifindex;
int count;
};
LIST_HEAD(,if_group_count) ifglist = LIST_HEAD_INITIALIZER(ifglist);
int
if_join_group(struct iface *iface, struct in_addr *addr)
{
struct ip_mreq mreq;
struct if_group_count *ifg;
struct if_addr *if_addr;
LIST_FOREACH(ifg, &ifglist, entry)
if (iface->ifindex == ifg->ifindex &&
addr->s_addr == ifg->addr.s_addr)
break;
if (ifg == NULL) {
if ((ifg = calloc(1, sizeof(*ifg))) == NULL)
fatal("if_join_group");
ifg->addr.s_addr = addr->s_addr;
ifg->ifindex = iface->ifindex;
LIST_INSERT_HEAD(&ifglist, ifg, entry);
}
if (ifg->count++ != 0)
/* already joined */
return (0);
if_addr = LIST_FIRST(&iface->addr_list);
mreq.imr_multiaddr.s_addr = addr->s_addr;
mreq.imr_interface.s_addr = if_addr->addr.s_addr;
if (setsockopt(iface->discovery_fd, IPPROTO_IP,
IP_ADD_MEMBERSHIP, (void *)&mreq, sizeof(mreq)) < 0) {
log_warn("if_join_group: error IP_ADD_MEMBERSHIP, "
"interface %s address %s", iface->name,
inet_ntoa(*addr));
LIST_REMOVE(ifg, entry);
free(ifg);
return (-1);
}
return (0);
}
int
if_leave_group(struct iface *iface, struct in_addr *addr)
{
struct ip_mreq mreq;
struct if_group_count *ifg;
struct if_addr *if_addr;
LIST_FOREACH(ifg, &ifglist, entry)
if (iface->ifindex == ifg->ifindex &&
addr->s_addr == ifg->addr.s_addr)
break;
/* if interface is not found just try to drop membership */
if (ifg) {
if (--ifg->count != 0)
/* others still joined */
return (0);
LIST_REMOVE(ifg, entry);
free(ifg);
}
if_addr = LIST_FIRST(&iface->addr_list);
if (!if_addr)
return (0);
mreq.imr_multiaddr.s_addr = addr->s_addr;
mreq.imr_interface.s_addr = if_addr->addr.s_addr;
if (setsockopt(iface->discovery_fd, IPPROTO_IP,
IP_DROP_MEMBERSHIP, (void *)&mreq, sizeof(mreq)) < 0) {
log_warn("if_leave_group: error IP_DROP_MEMBERSHIP, "
"interface %s address %s", iface->name,
inet_ntoa(*addr));
return (-1);
}
return (0);
}
int
if_set_mcast(struct iface *iface)
{
struct if_addr *if_addr;
if_addr = LIST_FIRST(&iface->addr_list);
if (setsockopt(iface->discovery_fd, IPPROTO_IP, IP_MULTICAST_IF,
&if_addr->addr.s_addr, sizeof(if_addr->addr.s_addr)) < 0) {
log_debug("if_set_mcast: error setting "
"IP_MULTICAST_IF, interface %s", iface->name);
return (-1);
}
return (0);
}
int
if_set_mcast_loop(int fd)
{
u_int8_t loop = 0;
if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
(char *)&loop, sizeof(loop)) < 0) {
log_warn("if_set_mcast_loop: error setting IP_MULTICAST_LOOP");
return (-1);
}
return (0);
}
|