[PATCH v4] ipvs: Add traffic statistic up even it is VS/DR or VS/TUN mode

[longguang.yue]

It's ipvs's duty to do traffic statistic if packets get hit,
no matter what mode it is.

Changes in v1: support DR/TUN mode statistic
Changes in v2: ip_vs_conn_out_get handles DR/TUN mode's conn
Changes in v3: fix checkpatch
Changes in v4: restructure and optimise this feature

Signed-off-by: longguang.yue <bigclouds@xxxxxxx>
---
 net/netfilter/ipvs/ip_vs_conn.c | 18 +++++++++++++++---
 net/netfilter/ipvs/ip_vs_core.c | 24 +++++++++++++++++-------
 2 files changed, 32 insertions(+), 10 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_conn.c b/net/netfilter/ipvs/ip_vs_conn.c
index a90b8eac16ac..af08ca2d9174 100644
--- a/net/netfilter/ipvs/ip_vs_conn.c
+++ b/net/netfilter/ipvs/ip_vs_conn.c
@@ -401,6 +401,8 @@ struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p)
 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p)
 {
 	unsigned int hash;
+	__be16 sport;
+	const union nf_inet_addr *saddr;
 	struct ip_vs_conn *cp, *ret=NULL;
 
 	/*
@@ -411,10 +413,20 @@ struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p)
 	rcu_read_lock();
 
 	hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) {
-		if (p->vport == cp->cport && p->cport == cp->dport &&
-		    cp->af == p->af &&
+		if (p->vport != cp->cport)
+			continue;
+
+		if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) {
+			sport = cp->vport;
+			saddr = &cp->vaddr;
+		} else {
+			sport = cp->dport;
+			saddr = &cp->daddr;
+		}
+
+		if (p->cport == sport && cp->af == p->af &&
 		    ip_vs_addr_equal(p->af, p->vaddr, &cp->caddr) &&
-		    ip_vs_addr_equal(p->af, p->caddr, &cp->daddr) &&
+		    ip_vs_addr_equal(p->af, p->caddr, saddr) &&
 		    p->protocol == cp->protocol &&
 		    cp->ipvs == p->ipvs) {
 			if (!__ip_vs_conn_get(cp))
diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
index e3668a6e54e4..315289aecad7 100644
--- a/net/netfilter/ipvs/ip_vs_core.c
+++ b/net/netfilter/ipvs/ip_vs_core.c
@@ -911,6 +911,10 @@ static int handle_response_icmp(int af, struct sk_buff *skb,
 		ip_vs_update_conntrack(skb, cp, 0);
 
 ignore_cp:
+	ip_vs_out_stats(cp, skb);
+	skb->ipvs_property = 1;
+	if (!(cp->flags & IP_VS_CONN_F_NFCT))
+		ip_vs_notrack(skb);
 	verdict = NF_ACCEPT;
 
 out:
@@ -1276,6 +1280,9 @@ handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
 {
 	struct ip_vs_protocol *pp = pd->pp;
 
+	if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)
+		goto ignore_cp;
+
 	IP_VS_DBG_PKT(11, af, pp, skb, iph->off, "Outgoing packet");
 
 	if (skb_ensure_writable(skb, iph->len))
@@ -1328,6 +1335,16 @@ handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
 	LeaveFunction(11);
 	return NF_ACCEPT;
 
+ignore_cp:
+	ip_vs_out_stats(cp, skb);
+	skb->ipvs_property = 1;
+	if (!(cp->flags & IP_VS_CONN_F_NFCT))
+		ip_vs_notrack(skb);
+	__ip_vs_conn_put(cp);
+
+	LeaveFunction(11);
+	return NF_ACCEPT;
+
 drop:
 	ip_vs_conn_put(cp);
 	kfree_skb(skb);
@@ -1413,8 +1430,6 @@ ip_vs_out(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, in
 			     ipvs, af, skb, &iph);
 
 	if (likely(cp)) {
-		if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)
-			goto ignore_cp;
 		return handle_response(af, skb, pd, cp, &iph, hooknum);
 	}
 
@@ -1475,14 +1490,9 @@ ip_vs_out(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, in
 		}
 	}
 
-out:
 	IP_VS_DBG_PKT(12, af, pp, skb, iph.off,
 		      "ip_vs_out: packet continues traversal as normal");
 	return NF_ACCEPT;
-
-ignore_cp:
-	__ip_vs_conn_put(cp);
-	goto out;
 }
 
 /*
-- 
2.20.1 (Apple Git-117)