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kernel: more fixes for flow offload

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- fix TCP connection state
- fix checksum error on DNAT

Signed-off-by: Felix Fietkau <nbd@nbd.name>
v19.07.3_mercusys_ac12_duma
Felix Fietkau 6 years ago
parent 9bf440fcd9
commit a5aee46fb7
4 changed files with 84 additions and 21 deletions
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29
target/linux/generic/backport-4.14/361-netfilter-nf_flow_table-add-a-new-flow-state-for-tea.patch
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@ -19,21 +19,30 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
struct flow_offload {
struct flow_offload_tuple_rhash tuplehash[FLOW_OFFLOAD_DIR_MAX];
@@ -108,6 +109,11 @@ static inline void flow_offload_dead(str
@@ -103,6 +104,7 @@ void nf_flow_table_cleanup(struct net *n
int nf_flow_table_init(struct nf_flowtable *flow_table);
void nf_flow_table_free(struct nf_flowtable *flow_table);
+void flow_offload_teardown(struct flow_offload *flow);
static inline void flow_offload_dead(struct flow_offload *flow)
{
flow->flags |= FLOW_OFFLOAD_DYING;
--- a/net/netfilter/nf_flow_table_core.c
+++ b/net/netfilter/nf_flow_table_core.c
@@ -174,6 +174,12 @@ static void flow_offload_del(struct nf_f
flow_offload_free(flow);
}
+static inline void flow_offload_teardown(struct flow_offload *flow)
+void flow_offload_teardown(struct flow_offload *flow)
+{
+ flow->flags |= FLOW_OFFLOAD_TEARDOWN;
+}
+EXPORT_SYMBOL_GPL(flow_offload_teardown);
+
int nf_flow_snat_port(const struct flow_offload *flow,
struct sk_buff *skb, unsigned int thoff,
u8 protocol, enum flow_offload_tuple_dir dir);
--- a/net/netfilter/nf_flow_table_core.c
+++ b/net/netfilter/nf_flow_table_core.c
@@ -226,11 +226,6 @@ static inline bool nf_flow_has_expired(c
struct flow_offload_tuple_rhash *
flow_offload_lookup(struct nf_flowtable *flow_table,
struct flow_offload_tuple *tuple)
@@ -226,11 +232,6 @@ static inline bool nf_flow_has_expired(c
return (__s32)(flow->timeout - (u32)jiffies) <= 0;
}
@ -45,7 +54,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
static int nf_flow_offload_gc_step(struct nf_flowtable *flow_table)
{
struct flow_offload_tuple_rhash *tuplehash;
@@ -258,7 +253,8 @@ static int nf_flow_offload_gc_step(struc
@@ -258,7 +259,8 @@ static int nf_flow_offload_gc_step(struc
flow = container_of(tuplehash, struct flow_offload, tuplehash[0]);
if (nf_flow_has_expired(flow) ||
@ -55,7 +64,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
flow_offload_del(flow_table, flow);
}
out:
@@ -419,10 +415,14 @@ static void nf_flow_table_do_cleanup(str
@@ -419,10 +421,14 @@ static void nf_flow_table_do_cleanup(str
{
struct net_device *dev = data;

2
target/linux/generic/backport-4.14/362-netfilter-nf_flow_table-in-flow_offload_lookup-skip-.patch
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@ -10,7 +10,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
--- a/net/netfilter/nf_flow_table_core.c
+++ b/net/netfilter/nf_flow_table_core.c
@@ -178,8 +178,21 @@ struct flow_offload_tuple_rhash *
@@ -184,8 +184,21 @@ struct flow_offload_tuple_rhash *
flow_offload_lookup(struct nf_flowtable *flow_table,
struct flow_offload_tuple *tuple)
{

55
target/linux/generic/backport-4.14/363-netfilter-nf_flow_table-add-support-for-sending-flow.patch
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@ -13,10 +13,17 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
--- a/net/netfilter/nf_flow_table_core.c
+++ b/net/netfilter/nf_flow_table_core.c
@@ -100,6 +100,36 @@ err_ct_refcnt:
@@ -100,6 +100,43 @@ err_ct_refcnt:
}
EXPORT_SYMBOL_GPL(flow_offload_alloc);
+static void flow_offload_fixup_tcp(struct ip_ct_tcp *tcp)
+{
+ tcp->state = TCP_CONNTRACK_ESTABLISHED;
+ tcp->seen[0].td_maxwin = 0;
+ tcp->seen[1].td_maxwin = 0;
+}
+
+static void flow_offload_fixup_ct_state(struct nf_conn *ct)
+{
+ const struct nf_conntrack_l4proto *l4proto;
@ -26,6 +33,9 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
+ int l4num;
+
+ l4num = nf_ct_protonum(ct);
+ if (l4num == IPPROTO_TCP)
+ flow_offload_fixup_tcp(&ct->proto.tcp);
+
+ l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), l4num);
+ if (!l4proto)
+ return;
@ -34,31 +44,56 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
+ if (!timeouts)
+ return;
+
+ if (l4num == IPPROTO_TCP) {
+ if (l4num == IPPROTO_TCP)
+ timeout = timeouts[TCP_CONNTRACK_ESTABLISHED];
+ ct->proto.tcp.state = TCP_CONNTRACK_IGNORE;
+ } else if (l4num == IPPROTO_UDP) {
+ else if (l4num == IPPROTO_UDP)
+ timeout = timeouts[UDP_CT_REPLIED];
+ } else {
+ else
+ return;
+ }
+
+ ct->timeout = nfct_time_stamp + timeout;
+ clear_bit(IPS_OFFLOAD_BIT, &ct->status);
+}
+
void flow_offload_free(struct flow_offload *flow)
{
struct flow_offload_entry *e;
@@ -107,7 +137,10 @@ void flow_offload_free(struct flow_offlo
@@ -107,7 +144,8 @@ void flow_offload_free(struct flow_offlo
dst_release(flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst_cache);
dst_release(flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_cache);
e = container_of(flow, struct flow_offload_entry, flow);
- nf_ct_delete(e->ct, 0, 0);
+ if (flow->flags & FLOW_OFFLOAD_DYING)
+ nf_ct_delete(e->ct, 0, 0);
+ else
+ flow_offload_fixup_ct_state(e->ct);
nf_ct_put(e->ct);
kfree_rcu(e, rcu_head);
}
@@ -164,6 +202,8 @@ EXPORT_SYMBOL_GPL(flow_offload_add);
static void flow_offload_del(struct nf_flowtable *flow_table,
struct flow_offload *flow)
{
+ struct flow_offload_entry *e;
+
rhashtable_remove_fast(&flow_table->rhashtable,
&flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].node,
nf_flow_offload_rhash_params);
@@ -171,12 +211,20 @@ static void flow_offload_del(struct nf_f
&flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].node,
nf_flow_offload_rhash_params);
+ e = container_of(flow, struct flow_offload_entry, flow);
+ clear_bit(IPS_OFFLOAD_BIT, &e->ct->status);
+
flow_offload_free(flow);
}
void flow_offload_teardown(struct flow_offload *flow)
{
+ struct flow_offload_entry *e;
+
flow->flags |= FLOW_OFFLOAD_TEARDOWN;
+
+ e = container_of(flow, struct flow_offload_entry, flow);
+ flow_offload_fixup_ct_state(e->ct);
}
EXPORT_SYMBOL_GPL(flow_offload_teardown);

19
target/linux/generic/backport-4.14/365-netfilter-nf_flow_table-fix-checksum-when-handling-D.patch
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@ -0,0 +1,19 @@
From: Felix Fietkau <nbd@nbd.name>
Date: Sun, 25 Feb 2018 17:22:55 +0100
Subject: [PATCH] netfilter: nf_flow_table: fix checksum when handling DNAT
Add a missing call to csum_replace4 like on SNAT
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/net/netfilter/nf_flow_table_ip.c
+++ b/net/netfilter/nf_flow_table_ip.c
@@ -130,6 +130,7 @@ static int nf_flow_dnat_ip(const struct
default:
return -1;
}
+ csum_replace4(&iph->check, addr, new_addr);
return nf_flow_nat_ip_l4proto(skb, iph, thoff, addr, new_addr);
}
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