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[NETFILTER] ip6tables: remove duplicate code

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Some IPv6 matches have very similar loops to find IPv6 extension header
and we can unify them. This patch introduces ipv6_find_hdr() to do it.
I just checked that it can find the target headers in the packet which has
dst,hbh,rt,frag,ah,esp headers.

Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yasuyuki Kozakai
2005-09-19 15:34:40 -07:00
committed by David S. Miller
parent 926b50f92a
commit e674d0f38d
8 changed files with 93 additions and 463 deletions
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include/linux/netfilter_ipv6/ip6_tables.h
+3
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@@ -455,6 +455,9 @@ extern unsigned int ip6t_do_table(struct sk_buff **pskb,
/* Check for an extension */
extern int ip6t_ext_hdr(u8 nexthdr);
/* find specified header and get offset to it */
extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
u8 target);
#define IP6T_ALIGN(s) (((s) + (__alignof__(struct ip6t_entry)-1)) & ~(__alignof__(struct ip6t_entry)-1))