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Message-Id: <1561715326-3945-2-git-send-email-wenxu@ucloud.cn>
Date: Fri, 28 Jun 2019 17:48:44 +0800
From: wenxu@...oud.cn
To: pablo@...filter.org, fw@...len.de
Cc: netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 2/4 nf-next v2] netfilter:nf_flow_table: Separate inet operation to single function
From: wenxu <wenxu@...oud.cn>
This patch separate the inet family operation to single function.
Prepare for supporting the bridge family.
Signed-off-by: wenxu <wenxu@...oud.cn>
---
net/netfilter/nf_flow_table_core.c | 52 ++++++++++++++++++++++++++++----------
net/netfilter/nf_flow_table_ip.c | 34 +++++++++++++++----------
net/netfilter/nft_flow_offload.c | 2 +-
3 files changed, 60 insertions(+), 28 deletions(-)
diff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c
index 7e0b5bd..2bec409 100644
--- a/net/netfilter/nf_flow_table_core.c
+++ b/net/netfilter/nf_flow_table_core.c
@@ -22,6 +22,20 @@ struct flow_offload_entry {
static DEFINE_MUTEX(flowtable_lock);
static LIST_HEAD(flowtables);
+static struct dst_entry *
+flow_offload_fill_inet_dst(struct flow_offload_tuple *ft,
+ struct nf_flow_route *route,
+ enum flow_offload_tuple_dir dir)
+{
+ struct dst_entry *other_dst = route->tuple[!dir].dst;
+ struct dst_entry *dst = route->tuple[dir].dst;
+
+ ft->iifidx = other_dst->dev->ifindex;
+ ft->dst.dst_cache = dst;
+
+ return dst;
+}
+
static void
flow_offload_fill_dir(struct flow_offload *flow, struct nf_conn *ct,
struct nf_flow_dst *flow_dst,
@@ -29,9 +43,9 @@ struct flow_offload_entry {
{
struct flow_offload_tuple *ft = &flow->tuplehash[dir].tuple;
struct nf_conntrack_tuple *ctt = &ct->tuplehash[dir].tuple;
- struct dst_entry *other_dst = flow_dst->route.tuple[!dir].dst;
- struct dst_entry *dst = flow_dst->route.tuple[dir].dst;
+ struct dst_entry *dst;
+ dst = flow_offload_fill_inet_dst(ft, &flow_dst->route, dir);
ft->dir = dir;
switch (ctt->src.l3num) {
@@ -51,9 +65,19 @@ struct flow_offload_entry {
ft->l4proto = ctt->dst.protonum;
ft->src_port = ctt->src.u.tcp.port;
ft->dst_port = ctt->dst.u.tcp.port;
+}
- ft->iifidx = other_dst->dev->ifindex;
- ft->dst_cache = dst;
+static int flow_offload_dst_hold(struct nf_flow_dst *flow_dst)
+{
+ if (!dst_hold_safe(flow_dst->route.tuple[FLOW_OFFLOAD_DIR_ORIGINAL].dst))
+ return -1;
+
+ if (!dst_hold_safe(flow_dst->route.tuple[FLOW_OFFLOAD_DIR_REPLY].dst)) {
+ dst_release(flow_dst->route.tuple[FLOW_OFFLOAD_DIR_ORIGINAL].dst);
+ return -1;
+ }
+
+ return 0;
}
struct flow_offload *
@@ -72,11 +96,8 @@ struct flow_offload *
flow = &entry->flow;
- if (!dst_hold_safe(flow_dst->route.tuple[FLOW_OFFLOAD_DIR_ORIGINAL].dst))
- goto err_dst_cache_original;
-
- if (!dst_hold_safe(flow_dst->route.tuple[FLOW_OFFLOAD_DIR_REPLY].dst))
- goto err_dst_cache_reply;
+ if (flow_offload_dst_hold(flow_dst))
+ goto err_dst_cache;
entry->ct = ct;
@@ -90,9 +111,7 @@ struct flow_offload *
return flow;
-err_dst_cache_reply:
- dst_release(flow_dst->route.tuple[FLOW_OFFLOAD_DIR_ORIGINAL].dst);
-err_dst_cache_original:
+err_dst_cache:
kfree(entry);
err_ct_refcnt:
nf_ct_put(ct);
@@ -135,12 +154,17 @@ static void flow_offload_fixup_ct_state(struct nf_conn *ct)
ct->timeout = nfct_time_stamp + timeout;
}
+static void flow_offload_dst_release(struct flow_offload *flow)
+{
+ dst_release(flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst.dst_cache);
+ dst_release(flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst.dst_cache);
+}
+
void flow_offload_free(struct flow_offload *flow)
{
struct flow_offload_entry *e;
- dst_release(flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst.dst_cache);
- dst_release(flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst.dst_cache);
+ flow_offload_dst_release(flow);
e = container_of(flow, struct flow_offload_entry, flow);
if (flow->flags & FLOW_OFFLOAD_DYING)
nf_ct_delete(e->ct, 0, 0);
diff --git a/net/netfilter/nf_flow_table_ip.c b/net/netfilter/nf_flow_table_ip.c
index 0016bb8..24263e2 100644
--- a/net/netfilter/nf_flow_table_ip.c
+++ b/net/netfilter/nf_flow_table_ip.c
@@ -214,6 +214,25 @@ static bool nf_flow_exceeds_mtu(const struct sk_buff *skb, unsigned int mtu)
return true;
}
+static void nf_flow_inet_xmit(struct flow_offload *flow, struct sk_buff *skb,
+ enum flow_offload_tuple_dir dir)
+{
+ struct net_device *outdev;
+ struct rtable *rt;
+ struct iphdr *iph;
+ __be32 nexthop;
+
+ rt = (struct rtable *)flow->tuplehash[dir].tuple.dst.dst_cache;
+ outdev = rt->dst.dev;
+ iph = ip_hdr(skb);
+ ip_decrease_ttl(iph);
+
+ skb->dev = outdev;
+ nexthop = rt_nexthop(rt, flow->tuplehash[!dir].tuple.src_v4.s_addr);
+ skb_dst_set_noref(skb, &rt->dst);
+ neigh_xmit(NEIGH_ARP_TABLE, outdev, &nexthop, skb);
+}
+
unsigned int
nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
@@ -223,11 +242,7 @@ static bool nf_flow_exceeds_mtu(const struct sk_buff *skb, unsigned int mtu)
struct flow_offload_tuple tuple = {};
enum flow_offload_tuple_dir dir;
struct flow_offload *flow;
- struct net_device *outdev;
- struct rtable *rt;
unsigned int thoff;
- struct iphdr *iph;
- __be32 nexthop;
if (skb->protocol != htons(ETH_P_IP))
return NF_ACCEPT;
@@ -241,13 +256,11 @@ static bool nf_flow_exceeds_mtu(const struct sk_buff *skb, unsigned int mtu)
dir = tuplehash->tuple.dir;
flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]);
- rt = (struct rtable *)flow->tuplehash[dir].tuple.dst.dst_cache;
- outdev = rt->dst.dev;
if (unlikely(nf_flow_exceeds_mtu(skb, flow->tuplehash[dir].tuple.mtu)))
return NF_ACCEPT;
- if (skb_try_make_writable(skb, sizeof(*iph)))
+ if (skb_try_make_writable(skb, sizeof(struct iphdr)))
return NF_DROP;
thoff = ip_hdr(skb)->ihl * 4;
@@ -258,13 +271,8 @@ static bool nf_flow_exceeds_mtu(const struct sk_buff *skb, unsigned int mtu)
return NF_DROP;
flow->timeout = (u32)jiffies + NF_FLOW_TIMEOUT;
- iph = ip_hdr(skb);
- ip_decrease_ttl(iph);
- skb->dev = outdev;
- nexthop = rt_nexthop(rt, flow->tuplehash[!dir].tuple.src_v4.s_addr);
- skb_dst_set_noref(skb, &rt->dst);
- neigh_xmit(NEIGH_ARP_TABLE, outdev, &nexthop, skb);
+ nf_flow_inet_xmit(flow, skb, dir);
return NF_STOLEN;
}
diff --git a/net/netfilter/nft_flow_offload.c b/net/netfilter/nft_flow_offload.c
index 261c565..4af94ce 100644
--- a/net/netfilter/nft_flow_offload.c
+++ b/net/netfilter/nft_flow_offload.c
@@ -70,8 +70,8 @@ static void nft_flow_offload_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
- struct nf_flowtable *flowtable = &priv->flowtable->data;
struct nft_flow_offload *priv = nft_expr_priv(expr);
+ struct nf_flowtable *flowtable = &priv->flowtable->data;
enum ip_conntrack_info ctinfo;
struct nf_flow_dst flow_dst;
struct flow_offload *flow;
--
1.8.3.1
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