nat-t patch for 2.6

git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@1953 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/linux-2.6/patches/generic/102-openswan-2.4.0.kernel-2.6-natt.patch b/target/linux/linux-2.6/patches/generic/102-openswan-2.4.0.kernel-2.6-natt.patch
new file mode 100644 (file)
index 0000000..ab09e3c
--- /dev/null
+++ b/target/linux/linux-2.6/patches/generic/102-openswan-2.4.0.kernel-2.6-natt.patch
@@ -0,0 +1,129 @@
+packaging/utils/nattpatch 2.6
+--- /dev/null   Tue Mar 11 13:02:56 2003
++++ nat-t/include/net/xfrmudp.h     Mon Feb  9 13:51:03 2004
+@@ -0,0 +1,10 @@
++/*
++ * pointer to function for type that xfrm4_input wants, to permit
++ * decoupling of XFRM from udp.c
++ */
++#define HAVE_XFRM4_UDP_REGISTER
++
++typedef int (*xfrm4_rcv_encap_t)(struct sk_buff *skb, __u16 encap_type);
++extern int udp4_register_esp_rcvencap(xfrm4_rcv_encap_t func
++                                    , xfrm4_rcv_encap_t *oldfunc);
++extern int udp4_unregister_esp_rcvencap(xfrm4_rcv_encap_t func);
+--- /distros/kernel/linux-2.6.11.2/net/ipv4/Kconfig    2005-03-09 03:12:33.000000000 -0500
++++ swan26/net/ipv4/Kconfig    2005-04-04 18:46:13.000000000 -0400
+@@ -351,2 +351,8 @@
+ 
++config IPSEC_NAT_TRAVERSAL
++      bool "IPSEC NAT-Traversal (KLIPS compatible)"
++      depends on INET
++      ---help---
++          Includes support for RFC3947/RFC3948 NAT-Traversal of ESP over UDP.
++
+ config IP_TCPDIAG
+--- /distros/kernel/linux-2.6.11.2/./net/ipv4/udp.c    2005-03-09 03:11:09.000000000 -0500
++++ ./net/ipv4/udp.c   2005-04-09 20:46:46.000000000 -0400
+@@ -109,2 +109,3 @@
+ #include <net/xfrm.h>
++#include <net/xfrmudp.h>
+ 
+@@ -114,2 +115,4 @@
+ 
++static xfrm4_rcv_encap_t xfrm4_rcv_encap_func;
++
+ DEFINE_SNMP_STAT(struct udp_mib, udp_statistics);
+@@ -894,2 +897,38 @@
+ 
++#if defined(CONFIG_XFRM) || defined(CONFIG_IPSEC_NAT_TRAVERSAL)
++
++/* if XFRM isn't a module, then register it directly. */
++#if 0 && !defined(CONFIG_XFRM_MODULE) && !defined(CONFIG_IPSEC_NAT_TRAVERSAL)
++static xfrm4_rcv_encap_t xfrm4_rcv_encap_func = xfrm4_rcv_encap;
++#else
++static xfrm4_rcv_encap_t xfrm4_rcv_encap_func = NULL;
++#endif
++
++int udp4_register_esp_rcvencap(xfrm4_rcv_encap_t func
++                             , xfrm4_rcv_encap_t *oldfunc)
++{
++  if(oldfunc != NULL) {
++    *oldfunc = xfrm4_rcv_encap_func;
++  }
++
++#if 0
++  if(xfrm4_rcv_encap_func != NULL)
++    return -1;
++#endif
++
++  xfrm4_rcv_encap_func = func;
++  return 0;
++}
++
++int udp4_unregister_esp_rcvencap(xfrm4_rcv_encap_t func)
++{
++  if(xfrm4_rcv_encap_func != func)
++    return -1;
++
++  xfrm4_rcv_encap_func = NULL;
++  return 0;
++}
++#endif /* CONFIG_XFRM_MODULE || CONFIG_IPSEC_NAT_TRAVERSAL */
++
++
+ /* return:
+@@ -901,5 +940,5 @@
+ {
+-#ifndef CONFIG_XFRM
++#if !defined(CONFIG_XFRM) && !defined(CONFIG_IPSEC_NAT_TRAVERSAL)
+       return 1; 
+-#else
++#else /* either CONFIG_XFRM or CONFIG_IPSEC_NAT_TRAVERSAL */
+       struct udp_sock *up = udp_sk(sk);
+@@ -915,3 +954,3 @@
+       if (udpdata > skb->tail)
+-              return 1;
++              return 2;
+ 
+@@ -919,3 +958,3 @@
+       if (!encap_type)
+-              return 1;
++              return 3;
+ 
+@@ -934,3 +973,3 @@
+                       /* Must be an IKE packet.. pass it through */
+-                      return 1;
++                      return 4;
+               break;
+@@ -947,3 +986,3 @@
+                       /* Must be an IKE packet.. pass it through */
+-                      return 1;
++                      return 5;
+               break;
+@@ -956,2 +995,4 @@
+        */
++      if (skb_cloned(skb) && pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
++              return 0;
+ 
+@@ -1019,5 +1060,9 @@
+               if (ret < 0) {
+-                      /* process the ESP packet */
+-                      ret = xfrm4_rcv_encap(skb, up->encap_type);
+-                      UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
++                      if(xfrm4_rcv_encap_func != NULL) {
++                        ret = (*xfrm4_rcv_encap_func)(skb, up->encap_type);
++                        UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
++                      } else {
++                        UDP_INC_STATS_BH(UDP_MIB_INERRORS);
++                        ret = 1;
++                      }
+                       return -ret;
+@@ -1574 +1619,7 @@
+ #endif
++
++#if defined(CONFIG_IPSEC_NAT_TRAVERSAL)
++EXPORT_SYMBOL(udp4_register_esp_rcvencap);
++EXPORT_SYMBOL(udp4_unregister_esp_rcvencap);
++#endif
++