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netfilter: ipset: forbid family for hash:mac sets

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Userspace `ipset` command forbids family option for hash:mac type:

ipset create test hash:mac family inet4
ipset v6.30: Unknown argument: `family'

However, this check is not done in kernel itself. When someone use
external netlink applications (pyroute2 python library for example), one
can create hash:mac with invalid family and inconsistant results from
userspace (`ipset` command cannot read set content anymore).

This patch enforce the logic in kernel, and forbids insertion of
hash:mac with a family set.

Since IP_SET_PROTO_UNDEF is defined only for hash:mac, this patch has no
impact on other hash:* sets

Signed-off-by: Florent Fourcot <florent.fourcot@wifirst.fr>
Signed-off-by: Victorien Molle <victorien.molle@wifirst.fr>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
This commit is contained in:
Florent Fourcot 2018-06-04 16:51:19 +02:00 committed by Jozsef Kadlecsik
parent 30a2e10710
commit cbdebe481a
1 changed files with 4 additions and 1 deletions
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5
net/netfilter/ipset/ip_set_hash_gen.h
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@ -1234,7 +1234,10 @@ IPSET_TOKEN(HTYPE, _create)(struct net *net, struct ip_set *set,
pr_debug("Create set %s with family %s\n",
set->name, set->family == NFPROTO_IPV4 ? "inet" : "inet6");
#ifndef IP_SET_PROTO_UNDEF
#ifdef IP_SET_PROTO_UNDEF
if (set->family != NFPROTO_UNSPEC)
return -IPSET_ERR_INVALID_FAMILY;
#else
if (!(set->family == NFPROTO_IPV4 || set->family == NFPROTO_IPV6))
return -IPSET_ERR_INVALID_FAMILY;
#endif