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/* $OpenBSD: ip_ipsp.c,v 1.6 1997/02/24 14:06:42 niklas Exp $ */
/*
* The author of this code is John Ioannidis, ji@tla.org,
* (except when noted otherwise).
*
* This code was written for BSD/OS in Athens, Greece, in November 1995.
*
* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
* by Angelos D. Keromytis, kermit@forthnet.gr.
*
* Copyright (C) 1995, 1996, 1997 by John Ioannidis and Angelos D. Keromytis.
*
* 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.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTY. IN PARTICULAR, NEITHER AUTHOR MAKES ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
* PURPOSE.
*/
/*
* IPSP Processing
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#include <netinet/ip_icmp.h>
#include <net/raw_cb.h>
#include <net/encap.h>
#include <netinet/ip_ipsp.h>
#include <netinet/ip_ah.h>
#include <netinet/ip_esp.h>
int tdb_init __P((struct tdb *, struct mbuf *));
int ipsp_kern __P((int, char **, int));
#ifdef ENCDEBUG
int encdebug = 1;
#endif
/*
* This is the proper place to define the various encapsulation transforms.
*/
struct xformsw xformsw[] = {
{ XF_IP4, 0, "IPv4 Simple Encapsulation",
ipe4_attach, ipe4_init, ipe4_zeroize,
(struct mbuf * (*)(struct mbuf *, struct tdb *))ipe4_input, ipe4_output, },
{ XF_AHMD5, XFT_AUTH, "Keyed MD5 Authentication",
ahmd5_attach, ahmd5_init, ahmd5_zeroize,
ahmd5_input, ahmd5_output, },
{ XF_ESPDES, XFT_CONF, "DES-CBC Encryption",
espdes_attach, espdes_init, espdes_zeroize,
espdes_input, espdes_output, },
{ XF_AHHMACMD5, XFT_AUTH, "HMAC MD5 Authentication",
ahhmacmd5_attach, ahhmacmd5_init, ahhmacmd5_zeroize,
ahhmacmd5_input, ahhmacmd5_output, },
{ XF_AHHMACSHA1, XFT_AUTH, "HMAC SHA1 Authentication",
ahhmacsha1_attach, ahhmacsha1_init, ahhmacsha1_zeroize,
ahhmacsha1_input, ahhmacsha1_output, },
{ XF_ESPDESMD5, XFT_CONF, "DES-CBC Encryption + MD5 Authentication",
espdesmd5_attach, espdesmd5_init, espdesmd5_zeroize,
espdesmd5_input, espdesmd5_output, },
{ XF_ESP3DESMD5, XFT_CONF, "3DES-CBC Encryption + MD5 Authentication",
esp3desmd5_attach, esp3desmd5_init, esp3desmd5_zeroize,
esp3desmd5_input, esp3desmd5_output, },
};
struct xformsw *xformswNXFORMSW = &xformsw[sizeof(xformsw)/sizeof(xformsw[0])];
unsigned char ipseczeroes[IPSEC_ZEROES_SIZE]; /* zeroes! */
static char *ipspkernfs = NULL;
int ipspkernfs_dirty = 1;
/*
* An IPSP SAID is really the concatenation of the SPI found in the
* packet and the destination address of the packet. When we receive
* an IPSP packet, we need to look up its tunnel descriptor block,
* based on the SPI in the packet and the destination address (which is
* really one of our addresses if we received the packet!
*/
struct tdb *
gettdb(u_long spi, struct in_addr dst)
{
int hashval;
struct tdb *tdbp;
hashval = (spi+dst.s_addr) % TDB_HASHMOD;
for (tdbp = tdbh[hashval]; tdbp; tdbp = tdbp->tdb_hnext)
if ((tdbp->tdb_spi == spi) && (tdbp->tdb_dst.s_addr == dst.s_addr))
break;
return tdbp;
}
void
puttdb(struct tdb *tdbp)
{
int hashval;
hashval = ((tdbp->tdb_spi + tdbp->tdb_dst.s_addr) % TDB_HASHMOD);
tdbp->tdb_hnext = tdbh[hashval];
tdbh[hashval] = tdbp;
ipspkernfs_dirty = 1;
}
int
tdb_delete(struct tdb *tdbp, int delchain)
{
struct tdb *tdbpp;
int hashval;
hashval = ((tdbp->tdb_spi + tdbp->tdb_dst.s_addr) % TDB_HASHMOD);
if (tdbh[hashval] == tdbp)
{
tdbpp = tdbp;
tdbh[hashval] = tdbp->tdb_hnext;
}
else
for (tdbpp = tdbh[hashval]; tdbpp != NULL; tdbpp = tdbpp->tdb_hnext)
if (tdbpp->tdb_hnext == tdbp)
{
tdbpp->tdb_hnext = tdbp->tdb_hnext;
tdbpp = tdbp;
}
if (tdbp != tdbpp)
return EINVAL; /* Should never happen */
ipspkernfs_dirty = 1;
tdbpp = tdbp->tdb_onext;
(*(tdbp->tdb_xform->xf_zeroize))(tdbp);
FREE(tdbp, M_TDB);
if (delchain && tdbpp)
return tdb_delete(tdbpp, delchain);
else
return 0;
}
int
tdb_init(struct tdb *tdbp, struct mbuf *m)
{
int alg;
struct encap_msghdr *em;
struct xformsw *xsp;
em = mtod(m, struct encap_msghdr *);
alg = em->em_alg;
for (xsp = xformsw; xsp < xformswNXFORMSW; xsp++)
if (xsp->xf_type == alg)
return (*(xsp->xf_init))(tdbp, xsp, m);
#ifdef ENCDEBUG
if (encdebug)
printf("tdbinit: no alg %d for spi %x, addr %x\n", alg, tdbp->tdb_spi, ntohl(tdbp->tdb_dst.s_addr));
#endif
m_freem(m);
return EINVAL;
}
int
ipsp_kern(int off, char **bufp, int len)
{
struct tdb *tdbp;
int i, k;
char *b;
if (off != 0)
return 0;
if ((!ipspkernfs_dirty) && (ipspkernfs))
{
*bufp = ipspkernfs;
return strlen(ipspkernfs);
}
else
ipspkernfs_dirty = 0;
if (ipspkernfs)
{
FREE(ipspkernfs, M_XDATA);
ipspkernfs = NULL;
}
for (i = 0, k = 0; i < TDB_HASHMOD; i++)
for (tdbp = tdbh[i]; tdbp != (struct tdb *) NULL; tdbp = tdbp->tdb_hnext)
{
/* Being paranoid to avoid buffer overflows */
k += 126 + strlen(tdbp->tdb_xform->xf_name);
if (tdbp->tdb_rcvif)
k += strlen(tdbp->tdb_rcvif->if_xname);
else
k += 4;
}
if (k == 0)
return 0;
MALLOC(ipspkernfs, char *, k + 1, M_XDATA, M_DONTWAIT);
if (!ipspkernfs)
return 0;
for (i = 0, k = 0; i < TDB_HASHMOD; i++)
for (tdbp = tdbh[i]; tdbp != (struct tdb *) NULL; tdbp = tdbp->tdb_hnext)
{
b = (char *)&(tdbp->tdb_dst.s_addr);
k += sprintf(ipspkernfs + k,
"SPI=%x, destination=%d.%d.%d.%d, interface=%s\n algorithm=%d (%s)\n next SPI=%x, previous SPI=%x\n",
ntohl(tdbp->tdb_spi), ((int)b[0] & 0xff), ((int)b[1] & 0xff),
((int)b[2] & 0xff), ((int)b[3] & 0xff),
(tdbp->tdb_rcvif ? tdbp->tdb_rcvif->if_xname : "none"),
tdbp->tdb_xform->xf_type, tdbp->tdb_xform->xf_name,
(tdbp->tdb_onext ? ntohl(tdbp->tdb_onext->tdb_spi) : 0),
(tdbp->tdb_inext ? ntohl(tdbp->tdb_inext->tdb_spi) : 0));
}
ipspkernfs[k] = '\0';
*bufp = ipspkernfs;
return strlen(ipspkernfs);
}
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