summaryrefslogtreecommitdiff
path: root/package/openswan/linux-2.6.22.6-openswan-2.4.9.kernel-2.6-natt.patch
blob: 7b29e6c1a55b6fbbce0f71891d6cea673d508d25 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
diff -rdupN linux-2.6.22.6.oorig/include/net/xfrmudp.h linux-2.6.22.6/include/net/xfrmudp.h
--- linux-2.6.22.6.oorig/include/net/xfrmudp.h	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.22.6/include/net/xfrmudp.h	2007-09-17 06:10:19.000000000 +0200
@@ -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);
diff -rdupN linux-2.6.22.6.oorig/net/ipv4/Kconfig linux-2.6.22.6/net/ipv4/Kconfig
--- linux-2.6.22.6.oorig/net/ipv4/Kconfig	2007-08-31 08:21:01.000000000 +0200
+++ linux-2.6.22.6/net/ipv4/Kconfig	2007-09-17 06:13:08.000000000 +0200
@@ -362,6 +360,15 @@ config SYN_COOKIES
 
 	  If unsure, say N.
 
+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.
+
+	  server is really overloaded. If this happens frequently better turn
+	  them off.
+
 config INET_AH
 	tristate "IP: AH transformation"
 	select XFRM
diff -rdupN linux-2.6.22.6.oorig/net/ipv4/udp.c linux-2.6.22.6/net/ipv4/udp.c
--- linux-2.6.22.6.oorig/net/ipv4/udp.c	2007-08-31 08:21:01.000000000 +0200
+++ linux-2.6.22.6/net/ipv4/udp.c	2007-09-17 06:10:19.000000000 +0200
@@ -108,6 +108,7 @@
  */
 
 DEFINE_SNMP_STAT(struct udp_mib, udp_statistics) __read_mostly;
+#include <net/xfrmudp.h>
 
 struct hlist_head udp_hash[UDP_HTABLE_SIZE];
 DEFINE_RWLOCK(udp_hash_lock);
@@ -919,6 +920,44 @@ int udp_disconnect(struct sock *sk, int 
 	return 0;
 }
 
+#if defined(CONFIG_XFRM) || defined(CONFIG_IPSEC_NAT_TRAVERSAL)
+
+/* if XFRM isn't a module, then register it directly. */
+#if !defined(CONFIG_XFRM_MODULE) 
+static xfrm4_rcv_encap_t xfrm4_rcv_encap_func = xfrm4_rcv_encap;
+#else
+static xfrm4_rcv_encap_t xfrm4_rcv_encap_func = NULL;
+#endif
+
+static xfrm4_rcv_encap_t xfrm4_rcv_encap_func;
+
+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 || defined(CONFIG_IPSEC_NAT_TRAVERSAL)*/
+
+
 /* return:
  * 	1  if the UDP system should process it
  *	0  if we should drop this packet
@@ -926,9 +965,9 @@ int udp_disconnect(struct sock *sk, int 
  */
 static int udp_encap_rcv(struct sock * sk, struct sk_buff *skb)
 {
-#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);
 	struct udphdr *uh;
 	struct iphdr *iph;
@@ -1056,10 +1095,14 @@ int udp_queue_rcv_skb(struct sock * sk, 
 			return 0;
 		}
 		if (ret < 0) {
-			/* process the ESP packet */
-			ret = xfrm4_rcv_encap(skb, up->encap_type);
-			UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
-			return -ret;
+ 			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;
 		}
 		/* FALLTHROUGH -- it's a UDP Packet */
 	}
@@ -1742,3 +1785,9 @@ EXPORT_SYMBOL(udp_poll);
 EXPORT_SYMBOL(udp_proc_register);
 EXPORT_SYMBOL(udp_proc_unregister);
 #endif
+
+#if defined(CONFIG_IPSEC_NAT_TRAVERSAL)
+EXPORT_SYMBOL(udp4_register_esp_rcvencap);
+EXPORT_SYMBOL(udp4_unregister_esp_rcvencap);
+#endif
+