Commit e0f31d84 authored by Govindarajulu Varadarajan's avatar Govindarajulu Varadarajan Committed by David S. Miller
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flow_keys: Record IP layer protocol in skb_flow_dissect() 



skb_flow_dissect() dissects only transport header type in ip_proto. It dose not
give any information about IPv4 or IPv6.

This patch adds new member, n_proto, to struct flow_keys. Which records the
IP layer type. i.e IPv4 or IPv6.

This can be used in netdev->ndo_rx_flow_steer driver function to dissect flow.

Adding new member to flow_keys increases the struct size by around 4 bytes.
This causes BUILD_BUG_ON(sizeof(qcb->data) < sz); to fail in
qdisc_cb_private_validate()

So increase data size by 4

Signed-off-by: default avatarGovindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent eef92962

include/net/flow_keys.h

+14 −0
Original line number Diff line number Diff line 
#ifndef _NET_FLOW_KEYS_H

#define _NET_FLOW_KEYS_H



/* struct flow_keys:

 *	@src: source ip address in case of IPv4

 *	      For IPv6 it contains 32bit hash of src address

 *	@dst: destination ip address in case of IPv4

 *	      For IPv6 it contains 32bit hash of dst address

 *	@ports: port numbers of Transport header

 *		port16[0]: src port number

 *		port16[1]: dst port number

 *	@thoff: Transport header offset

 *	@n_proto: Network header protocol (eg. IPv4/IPv6)

 *	@ip_proto: Transport header protocol (eg. TCP/UDP)

 * All the members, except thoff, are in network byte order.

 */

struct flow_keys {

	/* (src,dst) must be grouped, in the same way than in IP header */

	__be32 src;
@@ -10,6 +23,7 @@ struct flow_keys { 
		__be16 port16[2];

	};

	u16 thoff;

	u16 n_proto;

	u8 ip_proto;

};

include/net/sch_generic.h

+1 −1
Original line number Diff line number Diff line
@@ -231,7 +231,7 @@ struct qdisc_skb_cb { 
	unsigned int		pkt_len;

	u16			slave_dev_queue_mapping;

	u16			_pad;

	unsigned char		data[20];

	unsigned char		data[24];

};



static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)

net/core/flow_dissector.c

+1 −0
Original line number Diff line number Diff line
@@ -175,6 +175,7 @@ ipv6: 
		break;

	}



	flow->n_proto = proto;

	flow->ip_proto = ip_proto;

	flow->ports = skb_flow_get_ports(skb, nhoff, ip_proto);

	flow->thoff = (u16) nhoff;

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