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netfilter: ebtables: add support for matching IGMP type

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We already have ICMPv6 type/code matches (which can be used to distinguish
different types of MLD packets). Add support for IPv4 IGMP matches in the
same way.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Matthias Schiffer 2018-03-04 09:28:54 +01:00 • committed by Pablo Neira Ayuso
parent 5adc1668dd
commit 78d9f4d49b
2 changed files with 20 additions and 3 deletions
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4
include/uapi/linux/netfilter_bridge/ebt_ip.h
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@ -25,8 +25,9 @@
#define EBT_IP_SPORT 0x10
#define EBT_IP_DPORT 0x20
#define EBT_IP_ICMP 0x40
#define EBT_IP_IGMP 0x80
#define EBT_IP_MASK (EBT_IP_SOURCE | EBT_IP_DEST | EBT_IP_TOS | EBT_IP_PROTO |\
EBT_IP_SPORT | EBT_IP_DPORT | EBT_IP_ICMP)
EBT_IP_SPORT | EBT_IP_DPORT | EBT_IP_ICMP | EBT_IP_IGMP)
#define EBT_IP_MATCH "ip"
/* the same values are used for the invflags */
@ -42,6 +43,7 @@ struct ebt_ip_info {
union {
__u16 sport[2];
__u8 icmp_type[2];
__u8 igmp_type[2];
};
union {
__u16 dport[2];