[TCP] Update ext2_header_len when dst changes

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Hi:

This patch updates ext2_header_len which is needed when dst changes.
Without this TCP connections started before IPSEC SAs are set up will
hang when they try to send large packets.

Cheers,
-- 
Debian GNU/Linux 3.0 is out! ( http://www.debian.org/ )
Email:  Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
Index: kernel-source-2.5/net/ipv4/tcp_output.c
===================================================================
RCS file: /home/gondolin/herbert/src/CVS/debian/kernel-source-2.5/net/ipv4/tcp_output.c,v
retrieving revision 1.1.1.6
diff -u -r1.1.1.6 tcp_output.c
--- kernel-source-2.5/net/ipv4/tcp_output.c	2 Jul 2003 20:50:58 -0000	1.1.1.6
+++ kernel-source-2.5/net/ipv4/tcp_output.c	17 Aug 2003 12:42:43 -0000
@@ -557,6 +557,9 @@
 	struct dst_entry *dst = __sk_dst_get(sk);
 	int mss_now;
 
+	if (dst)
+		tp->ext2_header_len = dst->header_len;
+
 	if (dst && dst->ops->get_mss)
 		pmtu = dst->ops->get_mss(dst, pmtu);
 

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