From 52f072f580e4e5acfc65e40273e1cd4b544fbe63 Mon Sep 17 00:00:00 2001 From: Florent Fourcot Date: Mon, 4 Jun 2018 16:51:19 +0200 Subject: [PATCH] netfilter: ipset: forbid family for hash:mac sets [ Upstream commit cbdebe481a14b42c45aa9f4ceb5ff19b55de2c57 ] 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 Signed-off-by: Victorien Molle Signed-off-by: Jozsef Kadlecsik Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- net/netfilter/ipset/ip_set_hash_gen.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/net/netfilter/ipset/ip_set_hash_gen.h b/net/netfilter/ipset/ip_set_hash_gen.h index 51063d9ed0f7..dfd268166e42 100644 --- a/net/netfilter/ipset/ip_set_hash_gen.h +++ b/net/netfilter/ipset/ip_set_hash_gen.h @@ -1241,7 +1241,10 @@ 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