int
if_route(const char *ifname,
const struct in_addr *destination, const struct in_addr *netmask,
const struct in_addr *gateway, int metric, int action)
{
struct nlmr *nlm;
unsigned int ifindex;
int retval = 0;
if (!(ifindex = if_nametoindex(ifname))) {
errno = ENODEV;
return -1;
}
nlm = xzalloc(sizeof(*nlm));
nlm->hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
nlm->hdr.nlmsg_type = RTM_NEWROUTE;
if (action == 0)
nlm->hdr.nlmsg_flags = NLM_F_REPLACE;
else if (action > 0)
/*
* ers@google:
* commented out NLM_F_EXCL here and below. We
* sometimes keep one interface up while we are
* configuring the other one, and this flag
* causes route addition to fail.
*/
nlm->hdr.nlmsg_flags = NLM_F_CREATE /* | NLM_F_EXCL */;
else
nlm->hdr.nlmsg_type = RTM_DELROUTE;
nlm->hdr.nlmsg_flags |= NLM_F_REQUEST;
nlm->rt.rtm_family = AF_INET;
nlm->rt.rtm_table = RT_TABLE_MAIN;
if (action < 0)
nlm->rt.rtm_scope = RT_SCOPE_NOWHERE;
else {
nlm->hdr.nlmsg_flags |= NLM_F_CREATE /*| NLM_F_EXCL*/;
nlm->rt.rtm_protocol = RTPROT_BOOT;
if (gateway->s_addr == INADDR_ANY)
nlm->rt.rtm_scope = RT_SCOPE_LINK;
else
nlm->rt.rtm_scope = RT_SCOPE_UNIVERSE;
nlm->rt.rtm_type = RTN_UNICAST;
}
nlm->rt.rtm_dst_len = inet_ntocidr(*netmask);
add_attr_l(&nlm->hdr, sizeof(*nlm), RTA_DST,
&destination->s_addr, sizeof(destination->s_addr));
add_attr_l(&nlm->hdr, sizeof(*nlm), RTA_GATEWAY,
&gateway->s_addr, sizeof(gateway->s_addr));
add_attr_32(&nlm->hdr, sizeof(*nlm), RTA_OIF, ifindex);
add_attr_32(&nlm->hdr, sizeof(*nlm), RTA_PRIORITY, metric);
if (send_netlink(&nlm->hdr) == -1)
retval = -1;
free(nlm);
return retval;
}
static int do_route (const char *ifname,
struct in_addr destination,
struct in_addr netmask,
struct in_addr gateway,
int metric, int change, int del)
{
char *dstd;
char *gend;
struct
{
struct nlmsghdr hdr;
struct rtmsg rt;
char buffer[256];
}
nlm;
if (! ifname)
return -1;
dstd = strdup (inet_ntoa (destination));
gend = strdup (inet_ntoa (netmask));
if (gateway.s_addr == destination.s_addr)
logger (LOG_INFO, "%s route to %s (%s) metric %d",
change ? "changing" : del ? "removing" : "adding",
dstd, gend, metric);
else if (destination.s_addr == INADDR_ANY && netmask.s_addr == INADDR_ANY)
logger (LOG_INFO, "%s default route via %s metric %d",
change ? "changing" : del ? "removing" : "adding",
inet_ntoa (gateway), metric);
else
logger (LOG_INFO, "%s route to %s (%s) via %s metric %d",
change ? "changing" : del ? "removing" : "adding",
dstd, gend, inet_ntoa (gateway), metric);
if (dstd)
free (dstd);
if (gend)
free (gend);
memset (&nlm, 0, sizeof (nlm));
nlm.hdr.nlmsg_len = NLMSG_LENGTH (sizeof (struct rtmsg));
if (change)
nlm.hdr.nlmsg_flags = NLM_F_REPLACE;
else if (! del)
nlm.hdr.nlmsg_flags = NLM_F_CREATE | NLM_F_EXCL;
nlm.hdr.nlmsg_flags |= NLM_F_REQUEST;
nlm.hdr.nlmsg_type = del ? RTM_DELROUTE : RTM_NEWROUTE;
nlm.rt.rtm_family = AF_INET;
nlm.rt.rtm_table = RT_TABLE_MAIN;
if (del)
nlm.rt.rtm_scope = RT_SCOPE_NOWHERE;
else
{
nlm.hdr.nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
nlm.rt.rtm_protocol = RTPROT_BOOT;
if (gateway.s_addr == INADDR_ANY ||
netmask.s_addr == INADDR_BROADCAST)
nlm.rt.rtm_scope = RT_SCOPE_LINK;
else
nlm.rt.rtm_scope = RT_SCOPE_UNIVERSE;
nlm.rt.rtm_type = RTN_UNICAST;
}
nlm.rt.rtm_dst_len = inet_ntocidr (netmask);
add_attr_l (&nlm.hdr, sizeof (nlm), RTA_DST, &destination.s_addr,
sizeof (destination.s_addr));
if (gateway.s_addr != INADDR_ANY && gateway.s_addr != destination.s_addr)
add_attr_l (&nlm.hdr, sizeof (nlm), RTA_GATEWAY, &gateway.s_addr,
sizeof (gateway.s_addr));
add_attr_32 (&nlm.hdr, sizeof (nlm), RTA_OIF, if_nametoindex (ifname));
add_attr_32 (&nlm.hdr, sizeof (nlm), RTA_PRIORITY, metric);
return send_netlink (&nlm.hdr);
}
int
if_route6(const struct rt6 *rt, int action)
{
struct nlmr *nlm;
char metricsbuf[32];
struct rtattr *metrics = (void *)metricsbuf;
int retval = 0;
nlm = calloc(1, sizeof(*nlm));
if (nlm == NULL)
return -1;
nlm->hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
nlm->hdr.nlmsg_type = RTM_NEWROUTE;
nlm->hdr.nlmsg_flags = NLM_F_REQUEST;
if (action == 0)
nlm->hdr.nlmsg_flags |= NLM_F_REPLACE;
else if (action == 1)
nlm->hdr.nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
else
nlm->hdr.nlmsg_type = RTM_DELROUTE;
nlm->rt.rtm_family = AF_INET6;
nlm->rt.rtm_table = RT_TABLE_MAIN;
if (action == -1 || action == -2)
nlm->rt.rtm_scope = RT_SCOPE_NOWHERE;
else {
nlm->hdr.nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
/* None interface subnet routes are static. */
if (IN6_IS_ADDR_UNSPECIFIED(&rt->gate)) {
nlm->rt.rtm_protocol = RTPROT_KERNEL;
nlm->rt.rtm_scope = RT_SCOPE_LINK;
} else
nlm->rt.rtm_protocol = RTPROT_BOOT;
nlm->rt.rtm_type = RTN_UNICAST;
}
nlm->rt.rtm_dst_len = ipv6_prefixlen(&rt->net);
add_attr_l(&nlm->hdr, sizeof(*nlm), RTA_DST,
&rt->dest.s6_addr, sizeof(rt->dest.s6_addr));
/* If destination == gateway then don't add the gateway */
if (!IN6_IS_ADDR_UNSPECIFIED(&rt->gate) &&
!IN6_ARE_ADDR_EQUAL(&rt->dest, &rt->gate))
add_attr_l(&nlm->hdr, sizeof(*nlm), RTA_GATEWAY,
&rt->gate.s6_addr, sizeof(rt->gate.s6_addr));
add_attr_32(&nlm->hdr, sizeof(*nlm), RTA_OIF, rt->iface->index);
add_attr_32(&nlm->hdr, sizeof(*nlm), RTA_PRIORITY, rt->metric);
if (rt->mtu) {
metrics->rta_type = RTA_METRICS;
metrics->rta_len = RTA_LENGTH(0);
rta_add_attr_32(metrics, sizeof(metricsbuf), RTAX_MTU, rt->mtu);
add_attr_l(&nlm->hdr, sizeof(*nlm), RTA_METRICS,
RTA_DATA(metrics), RTA_PAYLOAD(metrics));
}
if (send_netlink(&nlm->hdr) == -1)
retval = -1;
free(nlm);
return retval;
errno = ENOTSUP;
return -1;
}
static int do_route (const char *ifname,
struct in_addr destination,
struct in_addr netmask,
struct in_addr gateway,
int metric, int change, int del)
{
struct nlmr *nlm;
unsigned int ifindex;
int retval;
if (! ifname)
return -1;
log_route (destination, netmask, gateway, metric, change, del);
if (! (ifindex = if_nametoindex (ifname))) {
logger (LOG_ERR, "if_nametoindex: Couldn't find index for interface `%s'",
ifname);
return -1;
}
nlm = xmalloc (sizeof (struct nlmr));
memset (nlm, 0, sizeof (struct nlmr));
nlm->hdr.nlmsg_len = NLMSG_LENGTH (sizeof (struct rtmsg));
if (change)
nlm->hdr.nlmsg_flags = NLM_F_REPLACE;
else if (! del)
nlm->hdr.nlmsg_flags = NLM_F_CREATE | NLM_F_EXCL;
nlm->hdr.nlmsg_flags |= NLM_F_REQUEST;
nlm->hdr.nlmsg_type = del ? RTM_DELROUTE : RTM_NEWROUTE;
nlm->rt.rtm_family = AF_INET;
nlm->rt.rtm_table = RT_TABLE_MAIN;
if (del)
nlm->rt.rtm_scope = RT_SCOPE_NOWHERE;
else {
nlm->hdr.nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
nlm->rt.rtm_protocol = RTPROT_BOOT;
if (netmask.s_addr == INADDR_BROADCAST ||
gateway.s_addr == INADDR_ANY)
nlm->rt.rtm_scope = RT_SCOPE_LINK;
else
nlm->rt.rtm_scope = RT_SCOPE_UNIVERSE;
nlm->rt.rtm_type = RTN_UNICAST;
}
nlm->rt.rtm_dst_len = inet_ntocidr (netmask);
add_attr_l (&nlm->hdr, sizeof (struct nlmr), RTA_DST,
&destination.s_addr, sizeof (destination.s_addr));
if (netmask.s_addr != INADDR_BROADCAST &&
destination.s_addr != gateway.s_addr)
add_attr_l (&nlm->hdr, sizeof (struct nlmr), RTA_GATEWAY,
&gateway.s_addr, sizeof (gateway.s_addr));
add_attr_32 (&nlm->hdr, sizeof (struct nlmr), RTA_OIF, ifindex);
add_attr_32 (&nlm->hdr, sizeof (struct nlmr), RTA_PRIORITY, metric);
retval = send_netlink (&nlm->hdr);
free (nlm);
return retval;
}
int
if_route(const struct rt *rt, int action)
{
struct nlmr *nlm;
int retval = 0;
struct dhcp_state *state;
nlm = calloc(1, sizeof(*nlm));
if (nlm == NULL)
return -1;
nlm->hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
nlm->hdr.nlmsg_type = RTM_NEWROUTE;
if (action == 0)
nlm->hdr.nlmsg_flags = NLM_F_REPLACE;
else if (action == 1)
nlm->hdr.nlmsg_flags = NLM_F_CREATE | NLM_F_EXCL;
else
nlm->hdr.nlmsg_type = RTM_DELROUTE;
nlm->hdr.nlmsg_flags |= NLM_F_REQUEST;
nlm->rt.rtm_family = AF_INET;
nlm->rt.rtm_table = RT_TABLE_MAIN;
state = D_STATE(rt->iface);
if (action == -1 || action == -2)
nlm->rt.rtm_scope = RT_SCOPE_NOWHERE;
else {
nlm->hdr.nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
/* We only change route metrics for kernel routes */
if (rt->dest.s_addr ==
(state->addr.s_addr & state->net.s_addr) &&
rt->net.s_addr == state->net.s_addr)
nlm->rt.rtm_protocol = RTPROT_KERNEL;
else
nlm->rt.rtm_protocol = RTPROT_BOOT;
if (rt->gate.s_addr == INADDR_ANY ||
(rt->gate.s_addr == rt->dest.s_addr &&
rt->net.s_addr == INADDR_BROADCAST))
nlm->rt.rtm_scope = RT_SCOPE_LINK;
else
nlm->rt.rtm_scope = RT_SCOPE_UNIVERSE;
nlm->rt.rtm_type = RTN_UNICAST;
}
nlm->rt.rtm_dst_len = inet_ntocidr(rt->net);
add_attr_l(&nlm->hdr, sizeof(*nlm), RTA_DST,
&rt->dest.s_addr, sizeof(rt->dest.s_addr));
if (nlm->rt.rtm_protocol == RTPROT_KERNEL) {
add_attr_l(&nlm->hdr, sizeof(*nlm), RTA_PREFSRC,
&state->addr.s_addr, sizeof(state->addr.s_addr));
}
/* If destination == gateway then don't add the gateway */
if (rt->dest.s_addr != rt->gate.s_addr ||
rt->net.s_addr != INADDR_BROADCAST)
add_attr_l(&nlm->hdr, sizeof(*nlm), RTA_GATEWAY,
&rt->gate.s_addr, sizeof(rt->gate.s_addr));
if (rt->gate.s_addr != htonl(INADDR_LOOPBACK))
add_attr_32(&nlm->hdr, sizeof(*nlm), RTA_OIF, rt->iface->index);
add_attr_32(&nlm->hdr, sizeof(*nlm), RTA_PRIORITY, rt->metric);
if (send_netlink(&nlm->hdr) == -1)
retval = -1;
free(nlm);
return retval;
}
