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Commit 453a940e authored by WANG Cong's avatar WANG Cong Committed by David S. Miller
Browse files

net: make skb an optional parameter for__skb_flow_dissect() 



Fixes: commit 690e36e7 (net: Allow raw buffers to be passed into the flow dissector)
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6451b3f5

include/net/flow_keys.h

+2 −2
Original line number Diff line number Diff line
@@ -28,10 +28,10 @@ struct flow_keys { 
};



bool __skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow,

			void *data, int hlen);

			void *data, __be16 proto, int nhoff, int hlen);

static inline bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow)

{

	return __skb_flow_dissect(skb, flow, NULL, 0);

	return __skb_flow_dissect(skb, flow, NULL, 0, 0, 0);

}

__be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,

			    void *data, int hlen_proto);

net/core/flow_dissector.c

+15 −3
Original line number Diff line number Diff line
@@ -59,14 +59,26 @@ __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto, 
}

EXPORT_SYMBOL(__skb_flow_get_ports);



bool __skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow, void *data, int hlen)

/**

 * __skb_flow_dissect - extract the flow_keys struct and return it

 * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified

 * @data: raw buffer pointer to the packet, if NULL use skb->data

 * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol

 * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)

 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)

 *

 * The function will try to retrieve the struct flow_keys from either the skbuff

 * or a raw buffer specified by the rest parameters

 */

bool __skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow,

			void *data, __be16 proto, int nhoff, int hlen)

{

	int nhoff = skb_network_offset(skb);

	u8 ip_proto;

	__be16 proto = skb->protocol;



	if (!data) {

		data = skb->data;

		proto = skb->protocol;

		nhoff = skb_network_offset(skb);

		hlen = skb_headlen(skb);

	}