diff options
| author |   Felix Fietkau <nbd@nbd.name> | 2018-03-23 19:15:37 +0100 |
|---|---|---|
| committer |   Pablo Neira Ayuso <pablo@netfilter.org> | 2018-04-24 10:29:04 +0200 |
| commit | 33894c367dbd5bd3ec5b26c643ca022798226dd9 (patch) | |
| tree | bb6ab3d400d1950eb4dcbe8a9cb2abc23e319559 /net/netfilter/nf_flow_table_ip.c | |
| parent | netfilter: nf_flow_table: tear down TCP flows if RST or FIN was seen (diff) | |
| download | linux-dev-33894c367dbd5bd3ec5b26c643ca022798226dd9.tar.xz linux-dev-33894c367dbd5bd3ec5b26c643ca022798226dd9.zip | |
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>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/nf_flow_table_ip.c')
| -rw-r--r-- | net/netfilter/nf_flow_table_ip.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/net/netfilter/nf_flow_table_ip.c b/net/netfilter/nf_flow_table_ip.c index 692c75ef5cb7..82451b7e0acb 100644 --- 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, struct sk_buff *skb, 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, struct sk_buff *skb, 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))) |