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netfilter: ipt_CLUSTERIP: check MAC address when duplicate config is set 

If same destination IP address config is already existing, that config is
just used. MAC address also should be same.
However, there is no MAC address checking routine.
So that MAC address checking routine is added.

test commands:
   %iptables -A INPUT -p tcp -i lo -d 192.168.0.5 --dport 80 \
	   -j CLUSTERIP --new --hashmode sourceip \
	   --clustermac 01:00:5e:00:00:20 --total-nodes 2 --local-node 1
   %iptables -A INPUT -p tcp -i lo -d 192.168.0.5 --dport 80 \
	   -j CLUSTERIP --new --hashmode sourceip \
	   --clustermac 01:00:5e:00:00:21 --total-nodes 2 --local-node 1

After this patch, above commands are disallowed.

Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Taehee Yoo 2018-11-05 18:23:25 +09:00 committed by Pablo Neira Ayuso
parent 2a61d8b883
commit 06aa151ad1
1 changed files with 2 additions and 1 deletions
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3
net/ipv4/netfilter/ipt_CLUSTERIP.c
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@ -509,7 +509,8 @@ static int clusterip_tg_check(const struct xt_tgchk_param *par)
if (IS_ERR(config))
return PTR_ERR(config);
}
}
} else if (memcmp(&config->clustermac, &cipinfo->clustermac, ETH_ALEN))
return -EINVAL;
ret = nf_ct_netns_get(par->net, par->family);
if (ret < 0) {