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-rw-r--r--include/linux/netfilter_ipv6/ip6_tables.h10
1 files changed, 8 insertions, 2 deletions
diff --git a/include/linux/netfilter_ipv6/ip6_tables.h b/include/linux/netfilter_ipv6/ip6_tables.h
index 4686f8342cbd..9a720f05888f 100644
--- a/include/linux/netfilter_ipv6/ip6_tables.h
+++ b/include/linux/netfilter_ipv6/ip6_tables.h
@@ -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;