[PATCH net-next v3 1/3] flow_dissector: factor out the ports extraction in skb_flow_get_ports

[Nikolay Aleksandrov <nikolay@redhat.com>]

Factor out the code that extracts the ports from skb_flow_dissect and
add a new function skb_flow_get_ports which can be re-used.

Suggested-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
---
v2: new patch
v3: fix a bug in skb_flow_dissect where thoff didn't have poff added by
    modifying thoff directly in skb_flow_get_ports as it's done anyway.
    Also add the necessary export symbol for skb_flow_get_ports.
This seems like a good idea because there're other users that can re-use
it later as well.

 include/net/flow_keys.h   |  1 +
 net/core/flow_dissector.c | 41 ++++++++++++++++++++++++++++++-----------
 2 files changed, 31 insertions(+), 11 deletions(-)

diff --git a/include/net/flow_keys.h b/include/net/flow_keys.h
index ac2439d..4db84ae 100644
--- a/include/net/flow_keys.h
+++ b/include/net/flow_keys.h
@@ -14,4 +14,5 @@ struct flow_keys {
 };
 
 bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow);
+__be32 skb_flow_get_ports(const struct sk_buff *skb, int *thoff, u8 ip_proto);
 #endif
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 1929af8..7785398 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -25,9 +25,37 @@ static void iph_to_flow_copy_addrs(struct flow_keys *flow, const struct iphdr *i
 	memcpy(&flow->src, &iph->saddr, sizeof(flow->src) + sizeof(flow->dst));
 }
 
+/**
+ * skb_flow_get_ports - extract the upper layer ports and return them
+ * @skb: buffer to extract the ports from
+ * @thoff: pointer to transport header offset
+ * @ip_proto: protocol for which to get port offset
+ *
+ * The function will try to retrieve the ports at offset thoff + poff where poff
+ * is the protocol port offset returned from proto_ports_offset, and if poff is
+ * more than or equal to 0 it'll add it to the value at the thoff address
+ */
+__be32 skb_flow_get_ports(const struct sk_buff *skb, int *thoff, u8 ip_proto)
+{
+	int poff = proto_ports_offset(ip_proto);
+
+	if (poff >= 0) {
+		__be32 *ports, _ports;
+
+		*thoff += poff;
+		ports = skb_header_pointer(skb, *thoff, sizeof(_ports),
+					   &_ports);
+		if (ports)
+			return *ports;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(skb_flow_get_ports);
+
 bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow)
 {
-	int poff, nhoff = skb_network_offset(skb);
+	int nhoff = skb_network_offset(skb);
 	u8 ip_proto;
 	__be16 proto = skb->protocol;
 
@@ -150,16 +178,7 @@ ipv6:
 	}
 
 	flow->ip_proto = ip_proto;
-	poff = proto_ports_offset(ip_proto);
-	if (poff >= 0) {
-		__be32 *ports, _ports;
-
-		nhoff += poff;
-		ports = skb_header_pointer(skb, nhoff, sizeof(_ports), &_ports);
-		if (ports)
-			flow->ports = *ports;
-	}
-
+	flow->ports = skb_flow_get_ports(skb, &nhoff, ip_proto);
 	flow->thoff = (u16) nhoff;
 
 	return true;
-- 
1.8.1.4