@@ -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_label */
+ 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;
};
@@ -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) {
@@ -313,8 +314,26 @@ 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 = (__force u32)*keyid;
+ }
nhoff += 4;
+ }
if (hdr->flags & GRE_SEQ)
nhoff += 4;
if (proto == htons(ETH_P_TEB)) {
@@ -648,6 +667,10 @@ 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[] = {
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> --- include/net/flow_dissector.h | 6 ++++++ net/core/flow_dissector.c | 25 ++++++++++++++++++++++++- 2 files changed, 30 insertions(+), 1 deletion(-)