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/* $OpenBSD: pfe_route.c,v 1.12 2017/05/28 10:39:15 benno Exp $ */
/*
* Copyright (c) 2009 - 2011 Reyk Floeter <reyk@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/queue.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/route.h>
#include <arpa/inet.h>
#include <limits.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "relayd.h"
struct relay_rtmsg {
struct rt_msghdr rm_hdr;
union {
struct {
struct sockaddr_in rm_dst;
struct sockaddr_in rm_gateway;
struct sockaddr_in rm_netmask;
struct sockaddr_rtlabel rm_label;
} u4;
struct {
struct sockaddr_in6 rm_dst;
struct sockaddr_in6 rm_gateway;
struct sockaddr_in6 rm_netmask;
struct sockaddr_rtlabel rm_label;
} u6;
} rm_u;
};
void
init_routes(struct relayd *env)
{
u_int rtfilter;
if (!(env->sc_conf.flags & F_NEEDRT))
return;
if ((env->sc_rtsock = socket(AF_ROUTE, SOCK_RAW, 0)) == -1)
fatal("%s: failed to open routing socket", __func__);
rtfilter = ROUTE_FILTER(0);
if (setsockopt(env->sc_rtsock, AF_ROUTE, ROUTE_MSGFILTER,
&rtfilter, sizeof(rtfilter)) == -1)
fatal("%s: ROUTE_MSGFILTER", __func__);
}
void
sync_routes(struct relayd *env, struct router *rt)
{
struct netroute *nr;
struct host *host;
char buf[HOST_NAME_MAX+1];
struct ctl_netroute crt;
if (!(env->sc_conf.flags & F_NEEDRT))
return;
TAILQ_FOREACH(nr, &rt->rt_netroutes, nr_entry) {
print_host(&nr->nr_conf.ss, buf, sizeof(buf));
TAILQ_FOREACH(host, &rt->rt_gwtable->hosts, entry) {
if (host->up == HOST_UNKNOWN)
continue;
log_debug("%s: "
"router %s route %s/%d gateway %s %s priority %d",
__func__,
rt->rt_conf.name, buf, nr->nr_conf.prefixlen,
host->conf.name,
HOST_ISUP(host->up) ? "up" : "down",
host->conf.priority);
crt.up = host->up;
memcpy(&crt.nr, &nr->nr_conf, sizeof(nr->nr_conf));
memcpy(&crt.host, &host->conf, sizeof(host->conf));
memcpy(&crt.rt, &rt->rt_conf, sizeof(rt->rt_conf));
proc_compose(env->sc_ps, PROC_PARENT,
IMSG_RTMSG, &crt, sizeof(crt));
}
}
}
int
pfe_route(struct relayd *env, struct ctl_netroute *crt)
{
struct relay_rtmsg rm;
struct sockaddr_rtlabel sr;
struct sockaddr_storage *gw;
struct sockaddr_in *s4;
struct sockaddr_in6 *s6;
size_t len = 0;
char *gwname;
int i = 0;
gw = &crt->host.ss;
gwname = crt->host.name;
bzero(&rm, sizeof(rm));
bzero(&sr, sizeof(sr));
rm.rm_hdr.rtm_msglen = len;
rm.rm_hdr.rtm_version = RTM_VERSION;
rm.rm_hdr.rtm_type = HOST_ISUP(crt->up) ? RTM_ADD : RTM_DELETE;
rm.rm_hdr.rtm_flags = RTF_STATIC | RTF_GATEWAY | RTF_MPATH;
rm.rm_hdr.rtm_seq = env->sc_rtseq++;
rm.rm_hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
rm.rm_hdr.rtm_tableid = crt->rt.rtable;
rm.rm_hdr.rtm_priority = crt->host.priority;
if (strlen(crt->rt.label)) {
rm.rm_hdr.rtm_addrs |= RTA_LABEL;
sr.sr_len = sizeof(sr);
if (snprintf(sr.sr_label, sizeof(sr.sr_label),
"%s", crt->rt.label) == -1)
goto bad;
}
if (crt->nr.ss.ss_family == AF_INET) {
rm.rm_hdr.rtm_msglen = len =
sizeof(rm.rm_hdr) + sizeof(rm.rm_u.u4);
bcopy(&sr, &rm.rm_u.u4.rm_label, sizeof(sr));
s4 = &rm.rm_u.u4.rm_dst;
s4->sin_family = AF_INET;
s4->sin_len = sizeof(rm.rm_u.u4.rm_dst);
s4->sin_addr.s_addr =
((struct sockaddr_in *)&crt->nr.ss)->sin_addr.s_addr;
s4 = &rm.rm_u.u4.rm_gateway;
s4->sin_family = AF_INET;
s4->sin_len = sizeof(rm.rm_u.u4.rm_gateway);
s4->sin_addr.s_addr =
((struct sockaddr_in *)gw)->sin_addr.s_addr;
rm.rm_hdr.rtm_addrs |= RTA_NETMASK;
s4 = &rm.rm_u.u4.rm_netmask;
s4->sin_family = AF_INET;
s4->sin_len = sizeof(rm.rm_u.u4.rm_netmask);
if (crt->nr.prefixlen)
s4->sin_addr.s_addr =
htonl(0xffffffff << (32 - crt->nr.prefixlen));
else if (crt->nr.prefixlen < 0)
rm.rm_hdr.rtm_flags |= RTF_HOST;
} else if (crt->nr.ss.ss_family == AF_INET6) {
rm.rm_hdr.rtm_msglen = len =
sizeof(rm.rm_hdr) + sizeof(rm.rm_u.u6);
bcopy(&sr, &rm.rm_u.u6.rm_label, sizeof(sr));
s6 = &rm.rm_u.u6.rm_dst;
bcopy(((struct sockaddr_in6 *)&crt->nr.ss),
s6, sizeof(*s6));
s6->sin6_family = AF_INET6;
s6->sin6_len = sizeof(*s6);
s6 = &rm.rm_u.u6.rm_gateway;
bcopy(((struct sockaddr_in6 *)gw), s6, sizeof(*s6));
s6->sin6_family = AF_INET6;
s6->sin6_len = sizeof(*s6);
rm.rm_hdr.rtm_addrs |= RTA_NETMASK;
s6 = &rm.rm_u.u6.rm_netmask;
s6->sin6_family = AF_INET6;
s6->sin6_len = sizeof(*s6);
if (crt->nr.prefixlen) {
for (i = 0; i < crt->nr.prefixlen / 8; i++)
s6->sin6_addr.s6_addr[i] = 0xff;
i = crt->nr.prefixlen % 8;
if (i)
s6->sin6_addr.s6_addr[crt->nr.prefixlen
/ 8] = 0xff00 >> i;
} else if (crt->nr.prefixlen < 0)
rm.rm_hdr.rtm_flags |= RTF_HOST;
} else
fatal("%s: invalid address family", __func__);
retry:
if (write(env->sc_rtsock, &rm, len) == -1) {
switch (errno) {
case EEXIST:
case ESRCH:
if (rm.rm_hdr.rtm_type == RTM_ADD) {
rm.rm_hdr.rtm_type = RTM_CHANGE;
goto retry;
} else if (rm.rm_hdr.rtm_type == RTM_DELETE) {
/* Ignore */
break;
}
/* FALLTHROUGH */
default:
goto bad;
}
}
log_debug("%s: gateway %s %s", __func__, gwname,
HOST_ISUP(crt->up) ? "added" : "deleted");
return (0);
bad:
log_debug("%s: failed to %s gateway %s: %d %s", __func__,
HOST_ISUP(crt->up) ? "add" : "delete", gwname,
errno, strerror(errno));
return (-1);
}
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