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/*
* processing code for IPCOMP
* Copyright (C) 2003 Michael Richardson <mcr@sandelman.ottawa.on.ca>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
char ipsec_ipcomp_c_version[] = "RCSID $Id: ipsec_ipcomp.c,v 1.5.2.1 2006/07/07 16:39:58 paul Exp $";
#include <linux/config.h>
#include <linux/version.h>
#define __NO_VERSION__
#include <linux/module.h>
#include <linux/kernel.h> /* printk() */
#include "openswan/ipsec_param.h"
#ifdef MALLOC_SLAB
# include <linux/slab.h> /* kmalloc() */
#else /* MALLOC_SLAB */
# include <linux/malloc.h> /* kmalloc() */
#endif /* MALLOC_SLAB */
#include <linux/errno.h> /* error codes */
#include <linux/types.h> /* size_t */
#include <linux/interrupt.h> /* mark_bh */
#include <linux/netdevice.h> /* struct device, and other headers */
#include <linux/etherdevice.h> /* eth_type_trans */
#include <linux/ip.h> /* struct iphdr */
#include <linux/skbuff.h>
#include <openswan.h>
#ifdef SPINLOCK
# ifdef SPINLOCK_23
# include <linux/spinlock.h> /* *lock* */
# else /* SPINLOCK_23 */
# include <asm/spinlock.h> /* *lock* */
# endif /* SPINLOCK_23 */
#endif /* SPINLOCK */
#include <net/ip.h>
#include "openswan/radij.h"
#include "openswan/ipsec_encap.h"
#include "openswan/ipsec_sa.h"
#include "openswan/ipsec_radij.h"
#include "openswan/ipsec_xform.h"
#include "openswan/ipsec_tunnel.h"
#include "openswan/ipsec_rcv.h"
#include "openswan/ipsec_xmit.h"
#include "openswan/ipsec_auth.h"
#ifdef CONFIG_KLIPS_IPCOMP
#include "openswan/ipsec_ipcomp.h"
#endif /* CONFIG_KLIPS_IPCOMP */
#include "openswan/ipsec_proto.h"
#ifdef CONFIG_KLIPS_DEBUG
int debug_ipcomp = 0;
#endif /* CONFIG_KLIPS_DEBUG */
#ifdef CONFIG_KLIPS_IPCOMP
enum ipsec_rcv_value
ipsec_rcv_ipcomp_checks(struct ipsec_rcv_state *irs,
struct sk_buff *skb)
{
int ipcompminlen;
ipcompminlen = sizeof(struct iphdr);
if(skb->len < (ipcompminlen + sizeof(struct ipcomphdr))) {
KLIPS_PRINT(debug_rcv & DB_RX_INAU,
"klips_debug:ipsec_rcv: "
"runt comp packet of skb->len=%d received from %s, dropped.\n",
skb->len,
irs->ipsaddr_txt);
if(irs->stats) {
irs->stats->rx_errors++;
}
return IPSEC_RCV_BADLEN;
}
irs->protostuff.ipcompstuff.compp = (struct ipcomphdr *)skb->h.raw;
irs->said.spi = htonl((__u32)ntohs(irs->protostuff.ipcompstuff.compp->ipcomp_cpi));
return IPSEC_RCV_OK;
}
enum ipsec_rcv_value
ipsec_rcv_ipcomp_decomp(struct ipsec_rcv_state *irs)
{
unsigned int flags = 0;
struct ipsec_sa *ipsp = irs->ipsp;
struct sk_buff *skb;
skb=irs->skb;
ipsec_xmit_dmp("ipcomp", skb->h.raw, skb->len);
if(ipsp == NULL) {
return IPSEC_RCV_SAIDNOTFOUND;
}
if(sysctl_ipsec_inbound_policy_check &&
((((ntohl(ipsp->ips_said.spi) & 0x0000ffff) != ntohl(irs->said.spi)) &&
(ipsp->ips_encalg != ntohl(irs->said.spi)) /* this is a workaround for peer non-compliance with rfc2393 */
))) {
char sa2[SATOT_BUF];
size_t sa_len2 = 0;
sa_len2 = satot(&ipsp->ips_said, 0, sa2, sizeof(sa2));
KLIPS_PRINT(debug_rcv,
"klips_debug:ipsec_rcv: "
"Incoming packet with SA(IPCA):%s does not match policy SA(IPCA):%s cpi=%04x cpi->spi=%08x spi=%08x, spi->cpi=%04x for SA grouping, dropped.\n",
irs->sa_len ? irs->sa : " (error)",
ipsp != NULL ? (sa_len2 ? sa2 : " (error)") : "NULL",
ntohs(irs->protostuff.ipcompstuff.compp->ipcomp_cpi),
(__u32)ntohl(irs->said.spi),
ipsp != NULL ? (__u32)ntohl((ipsp->ips_said.spi)) : 0,
ipsp != NULL ? (__u16)(ntohl(ipsp->ips_said.spi) & 0x0000ffff) : 0);
if(irs->stats) {
irs->stats->rx_dropped++;
}
return IPSEC_RCV_SAIDNOTFOUND;
}
ipsp->ips_comp_ratio_cbytes += ntohs(irs->ipp->tot_len);
irs->next_header = irs->protostuff.ipcompstuff.compp->ipcomp_nh;
skb = skb_decompress(skb, ipsp, &flags);
if (!skb || flags) {
spin_unlock(&tdb_lock);
KLIPS_PRINT(debug_rcv,
"klips_debug:ipsec_rcv: "
"skb_decompress() returned error flags=%x, dropped.\n",
flags);
if (irs->stats) {
if (flags)
irs->stats->rx_errors++;
else
irs->stats->rx_dropped++;
}
return IPSEC_RCV_IPCOMPFAILED;
}
/* make sure we update the pointer */
irs->skb = skb;
#ifdef NET_21
irs->ipp = skb->nh.iph;
#else /* NET_21 */
irs->ipp = skb->ip_hdr;
#endif /* NET_21 */
ipsp->ips_comp_ratio_dbytes += ntohs(irs->ipp->tot_len);
KLIPS_PRINT(debug_rcv,
"klips_debug:ipsec_rcv: "
"packet decompressed SA(IPCA):%s cpi->spi=%08x spi=%08x, spi->cpi=%04x, nh=%d.\n",
irs->sa_len ? irs->sa : " (error)",
(__u32)ntohl(irs->said.spi),
ipsp != NULL ? (__u32)ntohl((ipsp->ips_said.spi)) : 0,
ipsp != NULL ? (__u16)(ntohl(ipsp->ips_said.spi) & 0x0000ffff) : 0,
irs->next_header);
KLIPS_IP_PRINT(debug_rcv & DB_RX_PKTRX, irs->ipp);
return IPSEC_RCV_OK;
}
enum ipsec_xmit_value
ipsec_xmit_ipcomp_setup(struct ipsec_xmit_state *ixs)
{
unsigned int flags = 0;
#ifdef CONFIG_KLIPS_DEBUG
unsigned int old_tot_len = ntohs(ixs->iph->tot_len);
#endif /* CONFIG_KLIPS_DEBUG */
ixs->ipsp->ips_comp_ratio_dbytes += ntohs(ixs->iph->tot_len);
ixs->skb = skb_compress(ixs->skb, ixs->ipsp, &flags);
#ifdef NET_21
ixs->iph = ixs->skb->nh.iph;
#else /* NET_21 */
ixs->iph = ixs->skb->ip_hdr;
#endif /* NET_21 */
ixs->ipsp->ips_comp_ratio_cbytes += ntohs(ixs->iph->tot_len);
#ifdef CONFIG_KLIPS_DEBUG
if (debug_tunnel & DB_TN_CROUT)
{
if (old_tot_len > ntohs(ixs->iph->tot_len))
KLIPS_PRINT(debug_tunnel & DB_TN_CROUT,
"klips_debug:ipsec_xmit_encap_once: "
"packet shrunk from %d to %d bytes after compression, cpi=%04x (should be from spi=%08x, spi&0xffff=%04x.\n",
old_tot_len, ntohs(ixs->iph->tot_len),
ntohs(((struct ipcomphdr*)(((char*)ixs->iph) + ((ixs->iph->ihl) << 2)))->ipcomp_cpi),
ntohl(ixs->ipsp->ips_said.spi),
(__u16)(ntohl(ixs->ipsp->ips_said.spi) & 0x0000ffff));
else
KLIPS_PRINT(debug_tunnel & DB_TN_CROUT,
"klips_debug:ipsec_xmit_encap_once: "
"packet did not compress (flags = %d).\n",
flags);
}
#endif /* CONFIG_KLIPS_DEBUG */
return IPSEC_XMIT_OK;
}
struct xform_functions ipcomp_xform_funcs[]={
{rcv_checks: ipsec_rcv_ipcomp_checks,
rcv_decrypt: ipsec_rcv_ipcomp_decomp,
xmit_setup: ipsec_xmit_ipcomp_setup,
xmit_headroom: 0,
xmit_needtailroom: 0,
},
};
#if 0
/* We probably don't want to install a pure IPCOMP protocol handler, but
only want to handle IPCOMP if it is encapsulated inside an ESP payload
(which is already handled) */
#ifdef CONFIG_KLIPS_IPCOMP
struct inet_protocol comp_protocol =
{
ipsec_rcv, /* COMP handler */
NULL, /* COMP error control */
#ifdef NETDEV_25
1, /* no policy */
#else
0, /* next */
IPPROTO_COMP, /* protocol ID */
0, /* copy */
NULL, /* data */
"COMP" /* name */
#endif
};
#endif /* CONFIG_KLIPS_IPCOMP */
#endif
#endif /* CONFIG_KLIPS_IPCOMP */
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