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49 lines
1.4 KiB
49 lines
1.4 KiB
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7 years ago
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From: Felix Fietkau <nbd@nbd.name>
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Date: Fri, 23 Mar 2018 17:15:22 +0100
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Subject: [PATCH] netfilter: nf_flow_table: add missing condition for TCP state
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check
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Avoid looking at unrelated fields in UDP packets
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/net/netfilter/nf_flow_table_ip.c
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+++ b/net/netfilter/nf_flow_table_ip.c
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@@ -15,11 +15,14 @@
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#include <linux/tcp.h>
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#include <linux/udp.h>
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-static int nf_flow_tcp_state_check(struct flow_offload *flow,
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- struct sk_buff *skb, unsigned int thoff)
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+static int nf_flow_state_check(struct flow_offload *flow, int proto,
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+ struct sk_buff *skb, unsigned int thoff)
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{
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struct tcphdr *tcph;
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+ if (proto != IPPROTO_TCP)
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+ return 0;
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+
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if (!pskb_may_pull(skb, thoff + sizeof(*tcph)))
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return -1;
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@@ -248,7 +251,7 @@ nf_flow_offload_ip_hook(void *priv, stru
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return NF_DROP;
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thoff = ip_hdr(skb)->ihl * 4;
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- if (nf_flow_tcp_state_check(flow, skb, thoff))
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+ if (nf_flow_state_check(flow, ip_hdr(skb)->protocol, skb, thoff))
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return NF_ACCEPT;
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if (flow->flags & (FLOW_OFFLOAD_SNAT | FLOW_OFFLOAD_DNAT) &&
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@@ -460,7 +463,8 @@ nf_flow_offload_ipv6_hook(void *priv, st
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if (unlikely(nf_flow_exceeds_mtu(skb, flow->tuplehash[dir].tuple.mtu)))
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return NF_ACCEPT;
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- if (nf_flow_tcp_state_check(flow, skb, sizeof(*ip6h)))
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+ if (nf_flow_state_check(flow, ipv6_hdr(skb)->nexthdr, skb,
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+ sizeof(*ip6h)))
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return NF_ACCEPT;
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if (skb_try_make_writable(skb, sizeof(*ip6h)))
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