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/* $OpenBSD: xf_flow.c,v 1.1 1998/11/14 23:37:21 deraadt Exp $ */
/*
* The authors of this code are John Ioannidis (ji@tla.org),
* Angelos D. Keromytis (kermit@csd.uch.gr) and
* Niels Provos (provos@physnet.uni-hamburg.de).
*
* This code was written by John Ioannidis for BSD/OS in Athens, Greece,
* in November 1995.
*
* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
* by Angelos D. Keromytis.
*
* Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
* and Niels Provos.
*
* Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
* and Niels Provos.
*
* Permission to use, copy, and modify this software without fee
* is hereby granted, provided that this entire notice is included in
* all copies of any software which is or includes a copy or
* modification of this software.
* You may use this code under the GNU public license if you so wish. Please
* contribute changes back to the authors under this freer than GPL license
* so that we may further the use of strong encryption without limitations to
* all.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
* PURPOSE.
*/
#include <sys/param.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/mbuf.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/route.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#include <netns/ns.h>
#include <netiso/iso.h>
#include <netccitt/x25.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <paths.h>
#include "net/encap.h"
extern char buf[];
int
xf_flow(struct in_addr dst, u_int32_t spi, int proto,
struct in_addr osrc, struct in_addr osmask,
struct in_addr odst, struct in_addr odmask,
int tproto, int sport, int dport, int delete, int local)
{
struct sockaddr_encap *ddst, *msk, *gw;
struct rt_msghdr *rtm;
int sd, off, error = 0;
sd = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC);
if (sd < 0) {
perror("socket");
return 0;
}
bzero(buf, sizeof(*rtm) + SENT_IP4_LEN + SENT_IPSP_LEN + SENT_IP4_LEN);
rtm = (struct rt_msghdr *)(&buf[0]);
ddst = (struct sockaddr_encap *) (&buf[sizeof (*rtm)]);
off = sizeof(*rtm) + SENT_IP4_LEN;
if (!delete) {
gw = (struct sockaddr_encap *) (&buf[off]);
off += SENT_IPSP_LEN;
}
msk = (struct sockaddr_encap *) (&buf[off]);
rtm->rtm_version = RTM_VERSION;
rtm->rtm_type = delete ? RTM_DELETE : RTM_ADD;
rtm->rtm_index = 0;
rtm->rtm_pid = getpid();
rtm->rtm_addrs = RTA_DST | (delete ? 0 : RTA_GATEWAY) | RTA_NETMASK;
rtm->rtm_errno = 0;
rtm->rtm_flags = RTF_UP | (delete ? 0 : RTF_GATEWAY) | RTF_STATIC;
rtm->rtm_inits = 0;
ddst->sen_len = SENT_IP4_LEN;
ddst->sen_family = AF_ENCAP;
ddst->sen_type = SENT_IP4;
ddst->sen_ip_src.s_addr = osrc.s_addr & osmask.s_addr;
ddst->sen_ip_dst.s_addr = odst.s_addr & odmask.s_addr;
ddst->sen_proto = ddst->sen_sport = ddst->sen_dport = 0;
if (tproto > 0) {
ddst->sen_proto = tproto;
msk->sen_proto = 0xff;
if (sport > 0) {
ddst->sen_sport = sport;
msk->sen_sport = 0xffff;
}
if (dport > 0) {
ddst->sen_dport = dport;
msk->sen_dport = 0xffff;
}
}
if (!delete) {
gw->sen_len = SENT_IPSP_LEN;
gw->sen_family = AF_ENCAP;
gw->sen_type = SENT_IPSP;
gw->sen_ipsp_dst.s_addr = dst.s_addr;
gw->sen_ipsp_spi = spi;
gw->sen_ipsp_sproto = proto;
}
msk->sen_len = SENT_IP4_LEN;
msk->sen_family = AF_ENCAP;
msk->sen_type = SENT_IP4;
msk->sen_ip_src.s_addr = osmask.s_addr;
msk->sen_ip_dst.s_addr = odmask.s_addr;
rtm->rtm_msglen = sizeof(*rtm) + ddst->sen_len +
(delete ? 0 : gw->sen_len) + msk->sen_len;
if (write(sd, (caddr_t) buf, rtm->rtm_msglen) == -1) {
perror("write");
error = 1;
}
/* Additionally create/delete a flow for local packets */
if (local) {
ddst->sen_ip_src.s_addr = INADDR_ANY;
msk->sen_ip_src.s_addr = INADDR_BROADCAST;
if (write(sd, (caddr_t) buf, rtm->rtm_msglen) == -1) {
perror("write");
error = 1;
}
}
return (error ? 0 : 1);
}
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