[PATCH v3 net-next 5/5] net: Add GRE keyid in flow_keys
From: Tom Herbert <hidden>
Date: 2015-05-12 15:23:42
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
In flow dissector if a GRE header contains a keyid this is saved in the new extra entropy field of flow_keys. The GRE keyid is then represented in the flow hash function input. Signed-off-by: Tom Herbert <redacted> --- include/net/flow_keys.h | 1 + net/core/flow_dissector.c | 15 ++++++++++++++- 2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/include/net/flow_keys.h b/include/net/flow_keys.h
index 906d47a..779e42f 100644
--- a/include/net/flow_keys.h
+++ b/include/net/flow_keys.h@@ -28,6 +28,7 @@ struct flow_keys { u8 padding; u32 vlan_id:12, flow_label:20; + u32 extra_entropy; union { __be32 ports;
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index f1fb7a5..1b204ed 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c@@ -195,8 +195,21 @@ 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; + + flow->extra_entropy ^= ntohl(*keyid); + nhoff += 4; + } if (hdr->flags & GRE_SEQ) nhoff += 4; if (proto == htons(ETH_P_TEB)) {
--
1.8.1