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net: sched: em_ipt: match only on ip/ipv6 traffic 

Restrict matching only to ip/ipv6 traffic and make sure we can use the
headers, otherwise matches will be attempted on any protocol which can
be unexpected by the xt matches. Currently policy supports only ipv4/6.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2019-06-27 11:10:44 +03:00 committed by David S. Miller
parent aebd17b768
commit 9e10edd7dc
1 changed files with 13 additions and 0 deletions
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13
net/sched/em_ipt.c
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@ -185,6 +185,19 @@ static int em_ipt_match(struct sk_buff *skb, struct tcf_ematch *em,
struct nf_hook_state state;
int ret;
switch (tc_skb_protocol(skb)) {
case htons(ETH_P_IP):
if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
return 0;
break;
case htons(ETH_P_IPV6):
if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
return 0;
break;
default:
return 0;
}
rcu_read_lock();
if (skb->skb_iif)