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[NETFILTER]: ip6_tables: fix explanation of valid upper protocol number

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This explains the allowed upper protocol numbers. IP6T_F_NOPROTO was
introduced to use 0 as Hop-by-Hop option header, not wildcard. But that
seemed to be forgotten. 0 has been used as wildcard since 2002-08-23.

Signed-off-by: Yasuyuki Kozakai <yasuyuki@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yasuyuki Kozakai 2007-07-07 22:14:23 -07:00 committed by David S. Miller
parent 558585aad0
commit 7bfe246116
1 changed files with 8 additions and 2 deletions
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10
include/linux/netfilter_ipv6/ip6_tables.h
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@ -44,8 +44,14 @@ struct ip6t_ip6 {
char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
/* ARGH, HopByHop uses 0, so can't do 0 = ANY,
instead IP6T_F_NOPROTO must be set */
/* Upper protocol number
* - The allowed value is 0 (any) or protocol number of last parsable
* header, which is 50 (ESP), 59 (No Next Header), 135 (MH), or
* the non IPv6 extension headers.
* - The protocol numbers of IPv6 extension headers except of ESP and
* MH do not match any packets.
* - You also need to set IP6T_FLAGS_PROTO to "flags" to check protocol.
*/
u_int16_t proto;
/* TOS to match iff flags & IP6T_F_TOS */
u_int8_t tos;