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Add connection tracking label support.

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This patch adds a new 128-bit metadata field to the connection tracking
interface. When a label is specified as part of the ct action and the
connection is committed, the value is saved with the current connection.
Subsequent ct lookups with the table specified will expose this metadata
as the "ct_label" field in the flow.

For example, to allow new TCP connections from port 1->2 and only allow
established connections from port 2->1, and to associate a label with
those connections:

    table=0,priority=1,action=drop
    table=0,arp,action=normal
    table=0,in_port=1,tcp,action=ct(commit,exec(set_field:1->ct_label)),2
    table=0,in_port=2,ct_state=-trk,tcp,action=ct(table=1)
    table=1,in_port=2,ct_state=+trk,ct_label=1,tcp,action=1

Signed-off-by: Joe Stringer <joestringer@nicira.com>
Acked-by: Jarno Rajahalme <jrajahalme@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Joe Stringer
2015-10-13 11:13:10 -07:00
parent 8e53fe8cf7
commit 9daf23484f
28 changed files with 393 additions and 18 deletions
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3
lib/dpif-netdev.c
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@@ -1921,7 +1921,8 @@ dpif_netdev_flow_from_nlattrs(const struct nlattr *key, uint32_t key_len,
}
/* Userspace datapath doesn't support conntrack. */
if (flow->ct_state || flow->ct_zone || flow->ct_mark) {
if (flow->ct_state || flow->ct_zone || flow->ct_mark
|| !ovs_u128_is_zero(&flow->ct_label)) {
return EINVAL;
}