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authorFelix Fietkau <nbd@nbd.name>2018-03-23 17:18:00 +0100
committerFelix Fietkau <nbd@nbd.name>2018-03-23 19:16:12 +0100
commit48d17551b6a191b596d87a9b64ed69e96b55f1d8 (patch)
tree1fd9ade42683c05456dd2a369817bacdfa870192 /target/linux/generic
parent02fba1a181950e8e0b6bfc67e33000a38af82b19 (diff)
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kernel: fix flow offload UDP handling issue
Only run the TCP state check for TCP connections Signed-off-by: Felix Fietkau <nbd@nbd.name>
Diffstat (limited to 'target/linux/generic')
-rw-r--r--target/linux/generic/backport-4.14/367-netfilter-nf_flow_table-add-missing-condition-for-TC.patch48
1 files changed, 48 insertions, 0 deletions
diff --git a/target/linux/generic/backport-4.14/367-netfilter-nf_flow_table-add-missing-condition-for-TC.patch b/target/linux/generic/backport-4.14/367-netfilter-nf_flow_table-add-missing-condition-for-TC.patch
new file mode 100644
index 0000000000..2a470f77e3
--- /dev/null
+++ b/target/linux/generic/backport-4.14/367-netfilter-nf_flow_table-add-missing-condition-for-TC.patch
@@ -0,0 +1,48 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Fri, 23 Mar 2018 17:15:22 +0100
+Subject: [PATCH] netfilter: nf_flow_table: add missing condition for TCP state
+ check
+
+Avoid looking at unrelated fields in UDP packets
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/net/netfilter/nf_flow_table_ip.c
++++ b/net/netfilter/nf_flow_table_ip.c
+@@ -15,11 +15,14 @@
+ #include <linux/tcp.h>
+ #include <linux/udp.h>
+
+-static int nf_flow_tcp_state_check(struct flow_offload *flow,
+- struct sk_buff *skb, unsigned int thoff)
++static int nf_flow_state_check(struct flow_offload *flow, int proto,
++ struct sk_buff *skb, unsigned int thoff)
+ {
+ struct tcphdr *tcph;
+
++ if (proto != IPPROTO_TCP)
++ return 0;
++
+ if (!pskb_may_pull(skb, thoff + sizeof(*tcph)))
+ return -1;
+
+@@ -248,7 +251,7 @@ nf_flow_offload_ip_hook(void *priv, stru
+ return NF_DROP;
+
+ thoff = ip_hdr(skb)->ihl * 4;
+- if (nf_flow_tcp_state_check(flow, skb, thoff))
++ if (nf_flow_state_check(flow, ip_hdr(skb)->protocol, skb, thoff))
+ return NF_ACCEPT;
+
+ if (flow->flags & (FLOW_OFFLOAD_SNAT | FLOW_OFFLOAD_DNAT) &&
+@@ -460,7 +463,8 @@ nf_flow_offload_ipv6_hook(void *priv, st
+ if (unlikely(nf_flow_exceeds_mtu(skb, flow->tuplehash[dir].tuple.mtu)))
+ return NF_ACCEPT;
+
+- if (nf_flow_tcp_state_check(flow, skb, sizeof(*ip6h)))
++ if (nf_flow_state_check(flow, ipv6_hdr(skb)->nexthdr, skb,
++ sizeof(*ip6h)))
+ return NF_ACCEPT;
+
+ if (skb_try_make_writable(skb, sizeof(*ip6h)))