From 9e10edd7dcd37ddf55d30d1f8f85ae9306306879 Mon Sep 17 00:00:00 2001 From: Nikolay Aleksandrov Date: Thu, 27 Jun 2019 11:10:44 +0300 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- net/sched/em_ipt.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/net/sched/em_ipt.c b/net/sched/em_ipt.c index 243fd22f2248..64dbafe4e94c 100644 --- a/net/sched/em_ipt.c +++ b/net/sched/em_ipt.c @@ -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) -- 2.30.2