IPv6 auth header length calculation patch

[Kunihiro Ishiguro <kunihiro@ipinfusion.com>]

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This is a USAGI patch to fix IPv6 auth header length calculation.
(I'm not USAGI member.  I'm working on IPv6 IPsec based on 2.5 code
base).

RFC2402 2.2 Payload Length
:
   This 8-bit field specifies the length of AH in 32-bit words (4-byte
   units), minus "2".  (All IPv6 extension headers, as per RFC 1883,
   encode the "Hdr Ext Len" field by first subtracting 1 (64-bit word)
   from the header length (measured in 64-bit words).  AH is an IPv6
   extension header.  However, since its length is measured in 32-bit
   words, the "Payload Length" is calculated by subtracting 2 (32 bit
   words).)  In the "standard" case of a 96-bit authentication value

Would you mind to apply this to avoid wrong header length calculation?


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--- exthdrs.c.orig	2003-01-04 07:59:31.000000000 -0800
+++ exthdrs.c	2003-01-04 07:59:41.000000000 -0800
@@ -402,7 +402,7 @@
 	if (!pskb_may_pull(skb, (skb->h.raw-skb->data)+8))
 		goto fail;
 
-	len = (skb->h.raw[1]+1)<<2;
+	len = (skb->h.raw[1]+2)<<2;
 
 	if (len&7)
 		goto fail;