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net: Add GRE keyid in flow_keys 

In flow dissector if a GRE header contains a keyid this is saved in the
new keyid field of flow_keys. The GRE keyid is then represented
in the flow hash function input.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2015-06-04 09:16:45 -07:00 committed by David S. Miller
parent 87ee9e52ff
commit 1fdd512c92
2 changed files with 29 additions and 1 deletions
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6
include/net/flow_dissector.h
View File

@ -32,6 +32,10 @@ struct flow_dissector_key_tags {
flow_label:20;
};
struct flow_dissector_key_keyid {
__be32 keyid;
};
/**
* struct flow_dissector_key_ipv4_addrs:
* @src: source ip address
@ -113,6 +117,7 @@ enum flow_dissector_key_id {
FLOW_DISSECTOR_KEY_TIPC_ADDRS, /* struct flow_dissector_key_tipc_addrs */
FLOW_DISSECTOR_KEY_VLANID, /* struct flow_dissector_key_flow_tags */
FLOW_DISSECTOR_KEY_FLOW_LABEL, /* struct flow_dissector_key_flow_tags */
FLOW_DISSECTOR_KEY_GRE_KEYID, /* struct flow_dissector_key_keyid */
FLOW_DISSECTOR_KEY_MAX,
};
@ -150,6 +155,7 @@ struct flow_keys {
#define FLOW_KEYS_HASH_START_FIELD basic
struct flow_dissector_key_basic basic;
struct flow_dissector_key_tags tags;
struct flow_dissector_key_keyid keyid;
struct flow_dissector_key_ports ports;
struct flow_dissector_key_addrs addrs;
};

24
net/core/flow_dissector.c
View File

@ -127,6 +127,7 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
struct flow_dissector_key_addrs *key_addrs;
struct flow_dissector_key_ports *key_ports;
struct flow_dissector_key_tags *key_tags;
struct flow_dissector_key_keyid *key_keyid;
u8 ip_proto;
if (!data) {
@ -315,8 +316,25 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
nhoff += 4;
if (hdr->flags & GRE_CSUM)
nhoff += 4;
if (hdr->flags & GRE_KEY)
if (hdr->flags & GRE_KEY) {
const __be32 *keyid;
__be32 _keyid;
keyid = __skb_header_pointer(skb, nhoff, sizeof(_keyid),
data, hlen, &_keyid);
if (!keyid)
return false;
if (skb_flow_dissector_uses_key(flow_dissector,
FLOW_DISSECTOR_KEY_GRE_KEYID)) {
key_keyid = skb_flow_dissector_target(flow_dissector,
FLOW_DISSECTOR_KEY_GRE_KEYID,
target_container);
key_keyid->keyid = *keyid;
}
nhoff += 4;
}
if (hdr->flags & GRE_SEQ)
nhoff += 4;
if (proto == htons(ETH_P_TEB)) {
@ -650,6 +668,10 @@ static const struct flow_dissector_key flow_keys_dissector_keys[] = {
.key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
.offset = offsetof(struct flow_keys, tags),
},
{
.key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
.offset = offsetof(struct flow_keys, keyid),
},
};
static const struct flow_dissector_key flow_keys_buf_dissector_keys[] = {