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|
/* $OpenBSD: interface.c,v 1.3 2007/10/09 06:33:17 claudio Exp $ */
/*
* Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
* Copyright (c) 2004, 2005, 2007 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 <ctype.h>
#include <err.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <event.h>
#include "ospf6d.h"
#include "ospf6.h"
#include "log.h"
#include "ospfe.h"
void if_hello_timer(int, short, void *);
void if_start_hello_timer(struct iface *);
void if_stop_hello_timer(struct iface *);
void if_stop_wait_timer(struct iface *);
void if_wait_timer(int, short, void *);
void if_start_wait_timer(struct iface *);
void if_stop_wait_timer(struct iface *);
struct nbr *if_elect(struct nbr *, struct nbr *);
struct {
int state;
enum iface_event event;
enum iface_action action;
int new_state;
} iface_fsm[] = {
/* current state event that happened action to take resulting state */
{IF_STA_DOWN, IF_EVT_UP, IF_ACT_STRT, 0},
{IF_STA_WAITING, IF_EVT_BACKUP_SEEN, IF_ACT_ELECT, 0},
{IF_STA_WAITING, IF_EVT_WTIMER, IF_ACT_ELECT, 0},
{IF_STA_ANY, IF_EVT_WTIMER, IF_ACT_NOTHING, 0},
{IF_STA_WAITING, IF_EVT_NBR_CHNG, IF_ACT_NOTHING, 0},
{IF_STA_MULTI, IF_EVT_NBR_CHNG, IF_ACT_ELECT, 0},
{IF_STA_ANY, IF_EVT_NBR_CHNG, IF_ACT_NOTHING, 0},
{IF_STA_ANY, IF_EVT_DOWN, IF_ACT_RST, IF_STA_DOWN},
{IF_STA_ANY, IF_EVT_LOOP, IF_ACT_RST, IF_STA_LOOPBACK},
{IF_STA_LOOPBACK, IF_EVT_UNLOOP, IF_ACT_NOTHING, IF_STA_DOWN},
{-1, IF_EVT_NOTHING, IF_ACT_NOTHING, 0},
};
static int vlink_cnt = 0;
const char * const if_event_names[] = {
"NOTHING",
"UP",
"WAITTIMER",
"BACKUPSEEN",
"NEIGHBORCHANGE",
"LOOP",
"UNLOOP",
"DOWN"
};
const char * const if_action_names[] = {
"NOTHING",
"START",
"ELECT",
"RESET"
};
int
if_fsm(struct iface *iface, enum iface_event event)
{
int old_state;
int new_state = 0;
int i, ret = 0;
old_state = iface->state;
for (i = 0; iface_fsm[i].state != -1; i++)
if ((iface_fsm[i].state & old_state) &&
(iface_fsm[i].event == event)) {
new_state = iface_fsm[i].new_state;
break;
}
if (iface_fsm[i].state == -1) {
/* event outside of the defined fsm, ignore it. */
log_debug("if_fsm: interface %s, "
"event %s not expected in state %s", iface->name,
if_event_names[event], if_state_name(old_state));
return (0);
}
switch (iface_fsm[i].action) {
case IF_ACT_STRT:
ret = if_act_start(iface);
break;
case IF_ACT_ELECT:
ret = if_act_elect(iface);
break;
case IF_ACT_RST:
ret = if_act_reset(iface);
break;
case IF_ACT_NOTHING:
/* do nothing */
break;
}
if (ret) {
log_debug("if_fsm: error changing state for interface %s, "
"event %s, state %s", iface->name, if_event_names[event],
if_state_name(old_state));
return (-1);
}
if (new_state != 0)
iface->state = new_state;
if (iface->state != old_state)
orig_rtr_lsa(iface->area);
if (old_state & (IF_STA_MULTI | IF_STA_POINTTOPOINT) &&
(iface->state & (IF_STA_MULTI | IF_STA_POINTTOPOINT)) == 0)
ospfe_demote_iface(iface, 0);
if ((old_state & (IF_STA_MULTI | IF_STA_POINTTOPOINT)) == 0 &&
iface->state & (IF_STA_MULTI | IF_STA_POINTTOPOINT))
ospfe_demote_iface(iface, 1);
log_debug("if_fsm: event %s resulted in action %s and changing "
"state for interface %s from %s to %s",
if_event_names[event], if_action_names[iface_fsm[i].action],
iface->name, if_state_name(old_state), if_state_name(iface->state));
return (ret);
}
struct iface *
if_new(struct kif *kif, struct kif_addr *ka)
{
struct iface *iface;
if ((iface = calloc(1, sizeof(*iface))) == NULL)
err(1, "if_new: calloc");
iface->state = IF_STA_DOWN;
LIST_INIT(&iface->nbr_list);
TAILQ_INIT(&iface->ls_ack_list);
iface->crypt_seq_num = arc4random() & 0x0fffffff;
if (kif == NULL) {
iface->type = IF_TYPE_VIRTUALLINK;
snprintf(iface->name, sizeof(iface->name), "vlink%d",
vlink_cnt++);
iface->flags |= IFF_UP;
iface->mtu = IP_MSS;
return (iface);
}
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;
if (kif->flags & IFF_LOOPBACK) {
iface->type = IF_TYPE_POINTOPOINT;
iface->state = IF_STA_LOOPBACK;
}
/* get mtu, index and flags */
iface->mtu = kif->mtu;
iface->ifindex = kif->ifindex;
iface->flags = kif->flags;
iface->linkstate = kif->link_state;
iface->media_type = kif->media_type;
iface->baudrate = kif->baudrate;
/* set address, mask and p2p addr */
iface->addr = ka->addr;
iface->mask = ka->mask;
if (kif->flags & IFF_POINTOPOINT) {
iface->dst = ka->dstbrd;
}
return (iface);
}
void
if_del(struct iface *iface)
{
struct nbr *nbr = NULL;
log_debug("if_del: interface %s", iface->name);
/* revert the demotion when the interface is deleted */
if ((iface->state & (IF_STA_MULTI | IF_STA_POINTTOPOINT)) == 0)
ospfe_demote_iface(iface, 1);
/* clear lists etc */
while ((nbr = LIST_FIRST(&iface->nbr_list)) != NULL)
nbr_del(nbr);
if (evtimer_pending(&iface->hello_timer, NULL))
evtimer_del(&iface->hello_timer);
if (evtimer_pending(&iface->wait_timer, NULL))
evtimer_del(&iface->wait_timer);
if (evtimer_pending(&iface->lsack_tx_timer, NULL))
evtimer_del(&iface->lsack_tx_timer);
ls_ack_list_clr(iface);
free(iface);
}
void
if_init(struct ospfd_conf *xconf, struct iface *iface)
{
/* init the dummy local neighbor */
iface->self = nbr_new(ospfe_router_id(), iface, 1);
/* set event handlers for interface */
evtimer_set(&iface->lsack_tx_timer, ls_ack_tx_timer, iface);
evtimer_set(&iface->hello_timer, if_hello_timer, iface);
evtimer_set(&iface->wait_timer, if_wait_timer, iface);
iface->fd = xconf->ospf_socket;
ospfe_demote_iface(iface, 0);
}
/* timers */
/* ARGSUSED */
void
if_hello_timer(int fd, short event, void *arg)
{
struct iface *iface = arg;
struct timeval tv;
send_hello(iface);
/* 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;
timerclear(&tv);
if (evtimer_add(&iface->hello_timer, &tv) == -1)
fatal("if_start_hello_timer");
}
void
if_stop_hello_timer(struct iface *iface)
{
if (evtimer_del(&iface->hello_timer) == -1)
fatal("if_stop_hello_timer");
}
/* ARGSUSED */
void
if_wait_timer(int fd, short event, void *arg)
{
struct iface *iface = arg;
if_fsm(iface, IF_EVT_WTIMER);
}
void
if_start_wait_timer(struct iface *iface)
{
struct timeval tv;
timerclear(&tv);
tv.tv_sec = iface->dead_interval;
if (evtimer_add(&iface->wait_timer, &tv) == -1)
fatal("if_start_wait_timer");
}
void
if_stop_wait_timer(struct iface *iface)
{
if (evtimer_del(&iface->wait_timer) == -1)
fatal("if_stop_wait_timer");
}
/* actions */
int
if_act_start(struct iface *iface)
{
struct in6_addr addr;
struct timeval now;
if (!((iface->flags & IFF_UP) &&
(LINK_STATE_IS_UP(iface->linkstate) ||
(iface->linkstate == LINK_STATE_UNKNOWN &&
iface->media_type != IFT_CARP)))) {
log_debug("if_act_start: interface %s link down",
iface->name);
return (0);
}
if (iface->media_type == IFT_CARP && iface->passive == 0) {
/* force passive mode on carp interfaces */
log_warnx("if_act_start: forcing interface %s to passive",
iface->name);
iface->passive = 1;
}
if (iface->passive) {
/* for an update of stub network entries */
orig_rtr_lsa(iface->area);
return (0);
}
gettimeofday(&now, NULL);
iface->uptime = now.tv_sec;
switch (iface->type) {
case IF_TYPE_POINTOPOINT:
inet_pton(AF_INET6, AllSPFRouters, &addr);
if (if_join_group(iface, &addr))
return (-1);
iface->state = IF_STA_POINTTOPOINT;
break;
case IF_TYPE_VIRTUALLINK:
iface->state = IF_STA_POINTTOPOINT;
break;
case IF_TYPE_POINTOMULTIPOINT:
case IF_TYPE_NBMA:
log_debug("if_act_start: type %s not supported, interface %s",
if_type_name(iface->type), iface->name);
return (-1);
case IF_TYPE_BROADCAST:
inet_pton(AF_INET6, AllSPFRouters, &addr);
if (if_join_group(iface, &addr))
return (-1);
if (iface->priority == 0) {
iface->state = IF_STA_DROTHER;
} else {
iface->state = IF_STA_WAITING;
if_start_wait_timer(iface);
}
break;
default:
fatalx("if_act_start: unknown interface type");
}
/* hello timer needs to be started in any case */
if_start_hello_timer(iface);
return (0);
}
struct nbr *
if_elect(struct nbr *a, struct nbr *b)
{
if (a->priority > b->priority)
return (a);
if (a->priority < b->priority)
return (b);
if (ntohl(a->id.s_addr) > ntohl(b->id.s_addr))
return (a);
return (b);
}
int
if_act_elect(struct iface *iface)
{
struct in6_addr addr;
struct nbr *nbr, *bdr = NULL, *dr = NULL;
int round = 0;
int changed = 0;
int old_state;
char b1[16], b2[16], b3[16], b4[16];
start:
/* elect backup designated router */
LIST_FOREACH(nbr, &iface->nbr_list, entry) {
if (nbr->priority == 0 || nbr == dr || /* not electable */
nbr->state & NBR_STA_PRELIM || /* not available */
nbr->dr.s_addr == nbr->id.s_addr) /* don't elect DR */
continue;
if (bdr != NULL) {
/*
* routers announcing themselves as BDR have higher
* precedence over those routers announcing a
* different BDR.
*/
if (nbr->bdr.s_addr == nbr->id.s_addr) {
if (bdr->bdr.s_addr == bdr->id.s_addr)
bdr = if_elect(bdr, nbr);
else
bdr = nbr;
} else if (bdr->bdr.s_addr != bdr->id.s_addr)
bdr = if_elect(bdr, nbr);
} else
bdr = nbr;
}
/* elect designated router */
LIST_FOREACH(nbr, &iface->nbr_list, entry) {
if (nbr->priority == 0 || nbr->state & NBR_STA_PRELIM ||
(nbr != dr && nbr->dr.s_addr != nbr->id.s_addr))
/* only DR may be elected check priority too */
continue;
if (dr == NULL)
dr = nbr;
else
dr = if_elect(dr, nbr);
}
if (dr == NULL) {
/* no designate router found use backup DR */
dr = bdr;
bdr = NULL;
}
/*
* if we are involved in the election (e.g. new DR or no
* longer BDR) redo the election
*/
if (round == 0 &&
((iface->self == dr && iface->self != iface->dr) ||
(iface->self != dr && iface->self == iface->dr) ||
(iface->self == bdr && iface->self != iface->bdr) ||
(iface->self != bdr && iface->self == iface->bdr))) {
/*
* Reset announced DR/BDR to calculated one, so
* that we may get elected in the second round.
* This is needed to drop from a DR to a BDR.
*/
iface->self->dr.s_addr = dr->id.s_addr;
if (bdr)
iface->self->bdr.s_addr = bdr->id.s_addr;
round = 1;
goto start;
}
log_debug("if_act_elect: interface %s old dr %s new dr %s, "
"old bdr %s new bdr %s", iface->name,
iface->dr ? inet_ntop(AF_INET, &iface->dr->addr, b1, sizeof(b1)) :
"none", dr ? inet_ntop(AF_INET, &dr->addr, b2, sizeof(b2)) : "none",
iface->bdr ? inet_ntop(AF_INET, &iface->bdr->addr, b3, sizeof(b3)) :
"none", bdr ? inet_ntop(AF_INET, &bdr->addr, b4, sizeof(b4)) :
"none");
/*
* After the second round still DR or BDR change state to DR or BDR,
* etc.
*/
old_state = iface->state;
if (dr == iface->self)
iface->state = IF_STA_DR;
else if (bdr == iface->self)
iface->state = IF_STA_BACKUP;
else
iface->state = IF_STA_DROTHER;
/* TODO if iface is NBMA send all non eligible neighbors event Start */
/*
* if DR or BDR changed issue a AdjOK? event for all neighbors > 2-Way
*/
if (iface->dr != dr || iface->bdr != bdr)
changed = 1;
iface->dr = dr;
iface->bdr = bdr;
if (changed) {
inet_pton(AF_INET6, AllDRouters, &addr);
if (old_state & IF_STA_DRORBDR &&
(iface->state & IF_STA_DRORBDR) == 0) {
if (if_leave_group(iface, &addr))
return (-1);
} else if ((old_state & IF_STA_DRORBDR) == 0 &&
iface->state & IF_STA_DRORBDR) {
if (if_join_group(iface, &addr))
return (-1);
}
LIST_FOREACH(nbr, &iface->nbr_list, entry) {
if (nbr->state & NBR_STA_BIDIR)
nbr_fsm(nbr, NBR_EVT_ADJ_OK);
}
orig_rtr_lsa(iface->area);
if (iface->state & IF_STA_DR || old_state & IF_STA_DR)
orig_net_lsa(iface);
}
if_start_hello_timer(iface);
return (0);
}
int
if_act_reset(struct iface *iface)
{
struct nbr *nbr = NULL;
struct in6_addr addr;
if (iface->passive) {
/* for an update of stub network entries */
orig_rtr_lsa(iface->area);
return (0);
}
switch (iface->type) {
case IF_TYPE_POINTOPOINT:
case IF_TYPE_BROADCAST:
inet_pton(AF_INET6, AllSPFRouters, &addr);
if (if_leave_group(iface, &addr)) {
log_warnx("if_act_reset: error leaving group %s, "
"interface %s", log_in6addr(&addr), iface->name);
}
if (iface->state & IF_STA_DRORBDR) {
inet_pton(AF_INET6, AllDRouters, &addr);
if (if_leave_group(iface, &addr)) {
log_warnx("if_act_reset: "
"error leaving group %s, interface %s",
log_in6addr(&addr), iface->name);
}
}
break;
case IF_TYPE_VIRTUALLINK:
/* nothing */
break;
case IF_TYPE_NBMA:
case IF_TYPE_POINTOMULTIPOINT:
log_debug("if_act_reset: type %s not supported, interface %s",
if_type_name(iface->type), iface->name);
return (-1);
default:
fatalx("if_act_reset: unknown interface type");
}
LIST_FOREACH(nbr, &iface->nbr_list, entry) {
if (nbr_fsm(nbr, NBR_EVT_KILL_NBR)) {
log_debug("if_act_reset: error killing neighbor %s",
inet_ntoa(nbr->id));
}
}
iface->dr = NULL;
iface->bdr = NULL;
ls_ack_list_clr(iface);
stop_ls_ack_tx_timer(iface);
if_stop_hello_timer(iface);
if_stop_wait_timer(iface);
/* send empty hello to tell everybody that we are going down */
send_hello(iface);
return (0);
}
struct ctl_iface *
if_to_ctl(struct iface *iface)
{
static struct ctl_iface ictl;
struct timeval tv, now, res;
struct nbr *nbr;
memcpy(ictl.name, iface->name, sizeof(ictl.name));
memcpy(&ictl.addr, &iface->addr, sizeof(ictl.addr));
memcpy(&ictl.mask, &iface->mask, sizeof(ictl.mask));
ictl.rtr_id.s_addr = ospfe_router_id();
memcpy(&ictl.area, &iface->area->id, sizeof(ictl.area));
if (iface->dr) {
memcpy(&ictl.dr_id, &iface->dr->id, sizeof(ictl.dr_id));
memcpy(&ictl.dr_addr, &iface->dr->addr, sizeof(ictl.dr_addr));
} else {
bzero(&ictl.dr_id, sizeof(ictl.dr_id));
bzero(&ictl.dr_addr, sizeof(ictl.dr_addr));
}
if (iface->bdr) {
memcpy(&ictl.bdr_id, &iface->bdr->id, sizeof(ictl.bdr_id));
memcpy(&ictl.bdr_addr, &iface->bdr->addr,
sizeof(ictl.bdr_addr));
} else {
bzero(&ictl.bdr_id, sizeof(ictl.bdr_id));
bzero(&ictl.bdr_addr, sizeof(ictl.bdr_addr));
}
ictl.ifindex = iface->ifindex;
ictl.state = iface->state;
ictl.mtu = iface->mtu;
ictl.nbr_cnt = 0;
ictl.adj_cnt = 0;
ictl.baudrate = iface->baudrate;
ictl.dead_interval = iface->dead_interval;
ictl.transmit_delay = iface->transmit_delay;
ictl.hello_interval = iface->hello_interval;
ictl.flags = iface->flags;
ictl.metric = iface->metric;
ictl.rxmt_interval = iface->rxmt_interval;
ictl.type = iface->type;
ictl.linkstate = iface->linkstate;
ictl.mediatype = iface->media_type;
ictl.priority = iface->priority;
ictl.passive = iface->passive;
gettimeofday(&now, NULL);
if (evtimer_pending(&iface->hello_timer, &tv)) {
timersub(&tv, &now, &res);
ictl.hello_timer = res.tv_sec;
} else
ictl.hello_timer = -1;
if (iface->state != IF_STA_DOWN) {
ictl.uptime = now.tv_sec - iface->uptime;
} else
ictl.uptime = 0;
LIST_FOREACH(nbr, &iface->nbr_list, entry) {
if (nbr == iface->self)
continue;
ictl.nbr_cnt++;
if (nbr->state & NBR_STA_ADJFORM)
ictl.adj_cnt++;
}
return (&ictl);
}
/* misc */
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_join_group(struct iface *iface, struct in6_addr *addr)
{
struct ipv6_mreq mreq;
switch (iface->type) {
case IF_TYPE_POINTOPOINT:
case IF_TYPE_BROADCAST:
log_debug("if_join_group: interface %s addr %s",
iface->name, log_in6addr(addr));
mreq.ipv6mr_multiaddr = *addr;
mreq.ipv6mr_interface = iface->ifindex;
if (setsockopt(iface->fd, IPPROTO_IPV6, IPV6_JOIN_GROUP,
&mreq, sizeof(mreq)) < 0) {
log_warn("if_join_group: error IPV6_JOIN_GROUP, "
"interface %s address %s", iface->name,
log_in6addr(addr));
return (-1);
}
break;
case IF_TYPE_POINTOMULTIPOINT:
case IF_TYPE_VIRTUALLINK:
case IF_TYPE_NBMA:
log_debug("if_join_group: type %s not supported, interface %s",
if_type_name(iface->type), iface->name);
return (-1);
default:
fatalx("if_join_group: unknown interface type");
}
return (0);
}
int
if_leave_group(struct iface *iface, struct in6_addr *addr)
{
struct ipv6_mreq mreq;
switch (iface->type) {
case IF_TYPE_POINTOPOINT:
case IF_TYPE_BROADCAST:
log_debug("if_leave_group: interface %s addr %s",
iface->name, log_in6addr(addr));
mreq.ipv6mr_multiaddr = *addr;
mreq.ipv6mr_interface = iface->ifindex;
if (setsockopt(iface->fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP,
(void *)&mreq, sizeof(mreq)) < 0) {
log_warn("if_leave_group: error IPV6_LEAVE_GROUP, "
"interface %s address %s", iface->name,
log_in6addr(addr));
return (-1);
}
break;
case IF_TYPE_POINTOMULTIPOINT:
case IF_TYPE_VIRTUALLINK:
case IF_TYPE_NBMA:
log_debug("if_leave_group: type %s not supported, interface %s",
if_type_name(iface->type), iface->name);
return (-1);
default:
fatalx("if_leave_group: unknown interface type");
}
return (0);
}
int
if_set_mcast(struct iface *iface)
{
switch (iface->type) {
case IF_TYPE_POINTOPOINT:
case IF_TYPE_BROADCAST:
if (setsockopt(iface->fd, IPPROTO_IPV6, IPV6_MULTICAST_IF,
&iface->ifindex, sizeof(iface->ifindex)) < 0) {
log_debug("if_set_mcast: error setting "
"IP_MULTICAST_IF, interface %s", iface->name);
return (-1);
}
break;
case IF_TYPE_POINTOMULTIPOINT:
case IF_TYPE_VIRTUALLINK:
case IF_TYPE_NBMA:
log_debug("if_set_mcast: type %s not supported, interface %s",
if_type_name(iface->type), iface->name);
return (-1);
default:
fatalx("if_set_mcast: unknown interface type");
}
return (0);
}
int
if_set_mcast_loop(int fd)
{
u_int loop = 0;
if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
(u_int *)&loop, sizeof(loop)) < 0) {
log_warn("if_set_mcast_loop: error setting "
"IPV6_MULTICAST_LOOP");
return (-1);
}
return (0);
}
int
if_set_ipv6_pktinfo(int fd, int enable)
{
if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &enable,
sizeof(enable)) < 0) {
log_warn("if_set_ipv6_pktinfo: error setting IPV6_PKTINFO");
return (-1);
}
return (0);
}
int
if_set_ipv6_checksum(int fd)
{
int offset = offsetof(struct ospf_hdr, chksum);
log_debug("if_set_ipv6_checksum setting cksum offset to %i", offset);
if (setsockopt(fd, IPPROTO_IPV6, IPV6_CHECKSUM, &offset,
sizeof(offset)) < 0) {
log_warn("if_set_ipv6_checksum: error setting IPV6_CHECKSUM");
return (-1);
}
return (0);
}
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