From 6eef580c7ef4f9b32bd95029767e2bf8941a76b7 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Thu, 21 May 2009 19:35:10 +0000
Subject: [PATCH] brcm-2.4: potential fix for pptp nat

SVN-Revision: 15970
---
 .../patches/625-netfilter_nat_pptp_fix.patch  | 53 +++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 target/linux/generic-2.4/patches/625-netfilter_nat_pptp_fix.patch

diff --git a/target/linux/generic-2.4/patches/625-netfilter_nat_pptp_fix.patch b/target/linux/generic-2.4/patches/625-netfilter_nat_pptp_fix.patch
new file mode 100644
index 00000000000..c65c9614d75
--- /dev/null
+++ b/target/linux/generic-2.4/patches/625-netfilter_nat_pptp_fix.patch
@@ -0,0 +1,53 @@
+--- a/net/ipv4/netfilter/ip_conntrack_pptp.c
++++ b/net/ipv4/netfilter/ip_conntrack_pptp.c
+@@ -134,12 +134,11 @@ static int pptp_expectfn(struct ip_connt
+ }
+ 
+ /* timeout GRE data connections */
+-static int pptp_timeout_related(struct ip_conntrack *ct)
++static int pptp_timeout_related(struct ip_conntrack *ct, const struct iphdr *iph)
+ {
+ 	struct list_head *cur_item, *next;
+ 	struct ip_conntrack_expect *exp;
+ 	enum ip_conntrack_info ctinfo;
+-	struct iphdr *iph;
+ 
+ 	/* FIXME: do we have to lock something ? */
+ 	for (cur_item = ct->sibling_list.next;
+@@ -245,7 +244,8 @@ pptp_inbound_pkt(struct tcphdr *tcph,
+ 		 struct pptp_pkt_hdr *pptph, 
+ 		 size_t datalen,
+ 		 struct ip_conntrack *ct,
+-		 enum ip_conntrack_info ctinfo)
++		 enum ip_conntrack_info ctinfo,
++		 const struct iphdr *iph)
+ {
+ 	struct PptpControlHeader *ctlh;
+         union pptp_ctrl_union pptpReq;
+@@ -377,7 +377,7 @@ pptp_inbound_pkt(struct tcphdr *tcph,
+ 		info->cstate = PPTP_CALL_NONE;
+ 
+ 		/* untrack this call id, unexpect GRE packets */
+-		pptp_timeout_related(ct);
++		pptp_timeout_related(ct, iph);
+ 		break;
+ 
+ 	case PPTP_WAN_ERROR_NOTIFY:
+@@ -539,7 +539,7 @@ conntrack_pptp_help(const struct iphdr *
+ 		info->cstate = PPTP_CALL_NONE;
+ 
+ 		/* untrack this call id, unexpect GRE packets */
+-		pptp_timeout_related(ct);
++		pptp_timeout_related(ct, iph);
+ 	}
+ 
+ 
+@@ -571,7 +571,7 @@ conntrack_pptp_help(const struct iphdr *
+ 		ret = pptp_outbound_pkt(tcph, pptph, datalen, ct, ctinfo);
+ 	else
+ 		/* server -> client (PAC -> PNS) */
+-		ret = pptp_inbound_pkt(tcph, pptph, datalen, ct, ctinfo);
++		ret = pptp_inbound_pkt(tcph, pptph, datalen, ct, ctinfo, iph);
+ 	DEBUGP("sstate: %d->%d, cstate: %d->%d\n",
+ 		oldsstate, info->sstate, oldcstate, info->cstate);
+ 	UNLOCK_BH(&ip_pptp_lock);