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| author |   Tom Herbert <tom@herbertland.com> | 2015-06-04 09:16:45 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2015-06-04 15:44:31 -0700 |
| commit | 1fdd512c92003cf2d671ba22753d13302bf8cd1d (patch) | |
| tree | 43fc39f0d9f7429c5a0394200b9185765747ec27 /net/core/flow_dissector.c | |
| parent | net: Add IPv6 flow label to flow_keys (diff) | |
| download | linux-dev-1fdd512c92003cf2d671ba22753d13302bf8cd1d.tar.xz linux-dev-1fdd512c92003cf2d671ba22753d13302bf8cd1d.zip | |
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>
Diffstat (limited to 'net/core/flow_dissector.c')
| -rw-r--r-- | net/core/flow_dissector.c | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c index 70f0567b6be9..7ddc0a7b3da5 100644 --- a/net/core/flow_dissector.c +++ b/net/core/flow_dissector.c @@ -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 @@ ipv6: 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[] = { |