[PATCH v4 net-next 10/11] net: Add GRE keyid in flow_keys
From: Tom Herbert <hidden>
Date: 2015-05-28 18:19:37
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 keyid 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_dissector.h | 6 ++++++ net/core/flow_dissector.c | 24 +++++++++++++++++++++++- 2 files changed, 29 insertions(+), 1 deletion(-)
diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index 14d8483..5d4257b 100644
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h@@ -32,6 +32,10 @@ struct flow_dissector_key_tags { flow_label:20; }; +struct flow_dissector_key_keyid { + u32 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; };
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index ba089d9..ea318d5 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 = ntohl(*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[] = {
--
1.8.1