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/* $OpenBSD: kroute.c,v 1.5 2003/12/23 17:38:49 henning Exp $ */
/*
* Copyright (c) 2003 Henning Brauer <henning@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 <netinet/in.h>
#include <arpa/inet.h>
#include <net/route.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "bgpd.h"
int kroute_msg(int, int, struct kroute *);
u_int32_t rtseq = 1;
int
kroute_init(void)
{
int s, opt;
if ((s = socket(AF_ROUTE, SOCK_RAW, 0)) < 0)
fatal("route socket", errno);
if (fcntl(s, F_SETFL, O_NONBLOCK) == -1)
fatal(NULL, errno);
/* not intrested in my own messages */
if (setsockopt(s, SOL_SOCKET, SO_USELOOPBACK, &opt, sizeof(opt)) == -1)
fatal("route setsockopt", errno);
return (s);
}
int
kroute_msg(int fd, int action, struct kroute *kroute)
{
struct {
struct rt_msghdr hdr;
struct sockaddr_in prefix;
struct sockaddr_in nexthop;
struct sockaddr_in mask;
} r;
ssize_t n;
bzero(&r, sizeof(r));
r.hdr.rtm_msglen = sizeof(r);
r.hdr.rtm_version = RTM_VERSION;
r.hdr.rtm_type = action;
r.hdr.rtm_flags = RTF_GATEWAY|RTF_PROTO1; /* XXX */
r.hdr.rtm_seq = rtseq++; /* overflow doesn't matter */
r.hdr.rtm_addrs = RTA_DST|RTA_GATEWAY|RTA_NETMASK;
r.prefix.sin_len = sizeof(r.prefix);
r.prefix.sin_family = AF_INET;
r.prefix.sin_addr.s_addr = kroute->prefix;
r.nexthop.sin_len = sizeof(r.nexthop);
r.nexthop.sin_family = AF_INET;
r.nexthop.sin_addr.s_addr = kroute->nexthop;
r.mask.sin_len = sizeof(r.mask);
r.mask.sin_family = AF_INET;
r.mask.sin_addr.s_addr = htonl(0xffffffff << (32 - kroute->prefixlen));
retry:
if ((n = write(fd, &r, sizeof(r))) == -1) {
switch (errno) {
case ESRCH:
if (r.hdr.rtm_type == RTM_CHANGE) {
r.hdr.rtm_type = RTM_ADD;
goto retry;
} else if (r.hdr.rtm_type == RTM_DELETE) {
logit(LOG_INFO, "route vanished before delete");
return (0);
}
break;
case EEXIST: /* connected route. ignore */
return (0);
default:
logit(LOG_INFO, "kroute_msg: %s", strerror(errno));
return (-1);
}
}
if (n == sizeof(r))
return (0);
/* XXX we could not write everything... bad bad bad. cope. */
return (n);
}
int
kroute_add(int fd, struct kroute *kroute)
{
return (kroute_msg(fd, RTM_ADD, kroute));
}
int
kroute_change(int fd, struct kroute *kroute)
{
return (kroute_msg(fd, RTM_CHANGE, kroute));
}
int
kroute_delete(int fd, struct kroute *kroute)
{
return (kroute_msg(fd, RTM_DELETE, kroute));
}
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