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flow_keys: Record IP layer protocol in skb_flow_dissect()

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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: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Govindarajulu Varadarajan 2014-06-23 16:07:58 +05:30 • committed by David S. Miller
commit e0f31d8498
3 changed files with 16 additions and 1 deletions
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14
include/net/flow_keys.h
View file

@ -1,6 +1,19 @@
#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;
};

2
include/net/sch_generic.h
View file

@ -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)

1
net/core/flow_dissector.c
View file

@ -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;