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flow_dissector: add support for ingress ifindex dissection 

Add new key meta that contains ingress ifindex value and add a function
to dissect this from skb. The key and function is prepared to cover
other potential skb metadata values dissection.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
alistair/sunxi64-5.4-dsi
Jiri Pirko 2019-06-19 09:41:02 +03:00 committed by David S. Miller
parent 39f5886032
commit 82828b88f0
3 changed files with 29 additions and 0 deletions
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4
include/linux/skbuff.h
View File

@ -1320,6 +1320,10 @@ skb_flow_dissect_flow_keys_basic(const struct net *net,
data, proto, nhoff, hlen, flags);
}
void skb_flow_dissect_meta(const struct sk_buff *skb,
struct flow_dissector *flow_dissector,
void *target_container);
void
skb_flow_dissect_tunnel_info(const struct sk_buff *skb,
struct flow_dissector *flow_dissector,

9
include/net/flow_dissector.h
View File

@ -200,6 +200,14 @@ struct flow_dissector_key_ip {
__u8 ttl;
};
/**
* struct flow_dissector_key_meta:
* @ingress_ifindex: ingress ifindex
*/
struct flow_dissector_key_meta {
int ingress_ifindex;
};
enum flow_dissector_key_id {
FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */
FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
@ -225,6 +233,7 @@ enum flow_dissector_key_id {
FLOW_DISSECTOR_KEY_CVLAN, /* struct flow_dissector_key_vlan */
FLOW_DISSECTOR_KEY_ENC_IP, /* struct flow_dissector_key_ip */
FLOW_DISSECTOR_KEY_ENC_OPTS, /* struct flow_dissector_key_enc_opts */
FLOW_DISSECTOR_KEY_META, /* struct flow_dissector_key_meta */
FLOW_DISSECTOR_KEY_MAX,
};

16
net/core/flow_dissector.c
View File

@ -199,6 +199,22 @@ __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
}
EXPORT_SYMBOL(__skb_flow_get_ports);
void skb_flow_dissect_meta(const struct sk_buff *skb,
struct flow_dissector *flow_dissector,
void *target_container)
{
struct flow_dissector_key_meta *meta;
if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_META))
return;
meta = skb_flow_dissector_target(flow_dissector,
FLOW_DISSECTOR_KEY_META,
target_container);
meta->ingress_ifindex = skb->skb_iif;
}
EXPORT_SYMBOL(skb_flow_dissect_meta);
static void
skb_flow_dissect_set_enc_addr_type(enum flow_dissector_key_id type,
struct flow_dissector *flow_dissector,