diff options
Diffstat (limited to 'target/linux/generic/backport-4.19/364-v4.18-netfilter-nf_flow_table-tear-down-TCP-flows-if-RST-o.patch')
-rw-r--r-- | target/linux/generic/backport-4.19/364-v4.18-netfilter-nf_flow_table-tear-down-TCP-flows-if-RST-o.patch | 81 |
1 files changed, 0 insertions, 81 deletions
diff --git a/target/linux/generic/backport-4.19/364-v4.18-netfilter-nf_flow_table-tear-down-TCP-flows-if-RST-o.patch b/target/linux/generic/backport-4.19/364-v4.18-netfilter-nf_flow_table-tear-down-TCP-flows-if-RST-o.patch deleted file mode 100644 index 8b0024cd8d..0000000000 --- a/target/linux/generic/backport-4.19/364-v4.18-netfilter-nf_flow_table-tear-down-TCP-flows-if-RST-o.patch +++ /dev/null @@ -1,81 +0,0 @@ -From: Felix Fietkau <nbd@nbd.name> -Date: Sun, 25 Feb 2018 15:42:58 +0100 -Subject: [PATCH] netfilter: nf_flow_table: tear down TCP flows if RST or - FIN was seen - -Allow the slow path to handle the shutdown of the connection with proper -timeouts - -Signed-off-by: Felix Fietkau <nbd@nbd.name> ---- - ---- a/net/netfilter/nf_flow_table_ip.c -+++ b/net/netfilter/nf_flow_table_ip.c -@@ -15,6 +15,23 @@ - #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) -+{ -+ struct tcphdr *tcph; -+ -+ if (!pskb_may_pull(skb, thoff + sizeof(*tcph))) -+ return -1; -+ -+ tcph = (void *)(skb_network_header(skb) + thoff); -+ if (unlikely(tcph->fin || tcph->rst)) { -+ flow_offload_teardown(flow); -+ return -1; -+ } -+ -+ return 0; -+} -+ - static int nf_flow_nat_ip_tcp(struct sk_buff *skb, unsigned int thoff, - __be32 addr, __be32 new_addr) - { -@@ -118,10 +135,9 @@ static int nf_flow_dnat_ip(const struct - } - - static int nf_flow_nat_ip(const struct flow_offload *flow, struct sk_buff *skb, -- enum flow_offload_tuple_dir dir) -+ unsigned int thoff, enum flow_offload_tuple_dir dir) - { - struct iphdr *iph = ip_hdr(skb); -- unsigned int thoff = iph->ihl * 4; - - if (flow->flags & FLOW_OFFLOAD_SNAT && - (nf_flow_snat_port(flow, skb, thoff, iph->protocol, dir) < 0 || -@@ -201,6 +217,7 @@ nf_flow_offload_ip_hook(void *priv, stru - struct flow_offload *flow; - struct net_device *outdev; - const struct rtable *rt; -+ unsigned int thoff; - struct iphdr *iph; - __be32 nexthop; - -@@ -229,8 +246,12 @@ nf_flow_offload_ip_hook(void *priv, stru - if (skb_try_make_writable(skb, sizeof(*iph))) - return NF_DROP; - -+ thoff = ip_hdr(skb)->ihl * 4; -+ if (nf_flow_tcp_state_check(flow, skb, thoff)) -+ return NF_ACCEPT; -+ - if (flow->flags & (FLOW_OFFLOAD_SNAT | FLOW_OFFLOAD_DNAT) && -- nf_flow_nat_ip(flow, skb, dir) < 0) -+ nf_flow_nat_ip(flow, skb, thoff, dir) < 0) - return NF_DROP; - - flow->timeout = (u32)jiffies + NF_FLOW_TIMEOUT; -@@ -438,6 +459,9 @@ 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))) -+ return NF_ACCEPT; -+ - if (skb_try_make_writable(skb, sizeof(*ip6h))) - return NF_DROP; - |