From 7917b74060e056daf3f2886e4d746ae94b99d73a Mon Sep 17 00:00:00 2001
From: nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Mon, 18 Apr 2005 21:28:26 +0000
Subject: add ipsec nat traversal patch

git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@678 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
 .../linux/kernel-patches/311-ipsec-nat-traversal   | 140 +++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 package/linux/kernel-patches/311-ipsec-nat-traversal

(limited to 'package/linux/kernel-patches')

diff --git a/package/linux/kernel-patches/311-ipsec-nat-traversal b/package/linux/kernel-patches/311-ipsec-nat-traversal
new file mode 100644
index 000000000..fc4c29d27
--- /dev/null
+++ b/package/linux/kernel-patches/311-ipsec-nat-traversal
@@ -0,0 +1,140 @@
+packaging/utils/nattpatch 2.4
+--- linux/include/net/sock.h	2002/02/06 15:25:10	1.1
++++ linux/include/net/sock.h	2002/05/22 12:14:56
+@@ -488,7 +488,13 @@
+ 	} bictcp;
+ };
+ 
+- 	
++#if 1
++#define UDP_OPT_IN_SOCK 1
++struct udp_opt {
++	__u32 esp_in_udp;
++};
++#endif
++
+ /*
+  * This structure really needs to be cleaned up.
+  * Most of it is for TCP, and not used by any of
+@@ -655,6 +661,9 @@
+ #if defined(CONFIG_SPX) || defined (CONFIG_SPX_MODULE)
+ 		struct spx_opt		af_spx;
+ #endif /* CONFIG_SPX */
++#if 1
++		struct udp_opt          af_udp;
++#endif
+ 
+ 	} tp_pinfo;
+ 
+--- linux/net/Config.in.orig	Fri Feb  9 14:34:13 2001
++++ linux/net/Config.in	Thu Feb 22 19:40:08 2001
+@@ -88,3 +88,5 @@
+ endmenu
+ 
++bool 'IPSEC NAT-Traversal' CONFIG_IPSEC_NAT_TRAVERSAL
++
+ endmenu
+--- linux/net/ipv4/udp.c.1	Wed Jan 28 15:57:05 2004
++++ linux/net/ipv4/udp.c	Wed Jan 28 15:58:56 2004
+@@ -787,6 +787,9 @@
+ 
+ static int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
+ {
++#ifdef CONFIG_IPSEC_NAT_TRAVERSAL
++	struct udp_opt *tp =  &(sk->tp_pinfo.af_udp);
++#endif
+ 	/*
+ 	 *	Charge it to the socket, dropping if the queue is full.
+ 	 */
+@@ -804,6 +807,40 @@
+ 	}
+ #endif
+ 
++#ifdef CONFIG_IPSEC_NAT_TRAVERSAL
++	if (tp->esp_in_udp) {
++		/*
++		 * Set skb->sk and xmit packet to ipsec_rcv.
++		 *
++		 * If ret != 0, ipsec_rcv refused the packet (not ESPinUDP),
++		 * restore skb->sk and fall back to sock_queue_rcv_skb
++		 */
++		struct inet_protocol *esp = NULL;
++
++#if defined(CONFIG_KLIPS) && !defined(CONFIG_KLIPS_MODULE)
++               /* optomize only when we know it is statically linked */
++		extern struct inet_protocol esp_protocol;
++		esp = &esp_protocol;
++#else
++		for (esp = (struct inet_protocol *)inet_protos[IPPROTO_ESP & (MAX_INET_PROTOS - 1)];
++			(esp) && (esp->protocol != IPPROTO_ESP);
++			esp = esp->next);
++#endif
++
++		if (esp && esp->handler) {
++			struct sock *sav_sk = skb->sk;
++			skb->sk = sk;
++			if (esp->handler(skb) == 0) {
++				skb->sk = sav_sk;
++				/*not sure we might count ESPinUDP as UDP...*/
++				UDP_INC_STATS_BH(UdpInDatagrams);
++				return 0;
++			}
++			skb->sk = sav_sk;
++		}
++	}
++#endif
++
+ 	if (sock_queue_rcv_skb(sk,skb)<0) {
+ 		UDP_INC_STATS_BH(UdpInErrors);
+ 		IP_INC_STATS_BH(IpInDiscards);
+@@ -1027,13 +1064,49 @@
+ 	return len;
+ }
+ 
++static int udp_setsockopt(struct sock *sk, int level, int optname,
++	char *optval, int optlen)
++{
++	struct udp_opt *tp = &(sk->tp_pinfo.af_udp);
++	int val;
++	int err = 0;
++
++	if (level != SOL_UDP)
++		return ip_setsockopt(sk, level, optname, optval, optlen);
++
++	if(optlen<sizeof(int))
++		return -EINVAL;
++
++	if (get_user(val, (int *)optval))
++		return -EFAULT;
++	
++	lock_sock(sk);
++
++	switch(optname) {
++#ifdef CONFIG_IPSEC_NAT_TRAVERSAL
++#ifndef UDP_ESPINUDP
++#define UDP_ESPINUDP 100
++#endif
++		case UDP_ESPINUDP:
++			tp->esp_in_udp = val;
++			break;
++#endif
++		default:
++			err = -ENOPROTOOPT;
++			break;
++	}
++
++	release_sock(sk);
++	return err;
++}
++
+ struct proto udp_prot = {
+  	name:		"UDP",
+ 	close:		udp_close,
+ 	connect:	udp_connect,
+ 	disconnect:	udp_disconnect,
+ 	ioctl:		udp_ioctl,
+-	setsockopt:	ip_setsockopt,
++	setsockopt:	udp_setsockopt,
+ 	getsockopt:	ip_getsockopt,
+ 	sendmsg:	udp_sendmsg,
+ 	recvmsg:	udp_recvmsg,
-- 
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