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ofproto: Add support for master/slave controller coordination.

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Now that Open vSwitch has support for multiple simultaneous controllers,
there is some need for a degree of coordination among them.  For now, the
plan is for the controllers themselves to take the lead on this.  This
commit adds a small bit of OVS infrastructure: the ability for a controller
to designate itself as a "master" or a "slave".  There may be at most one
master at a time; when a controller designates itself as the master, then
any existing master is demoted to slave status.  Slave controllers are not
allowed to modify the flow table or global configuration; any attempt to
do so is rejected with a "bad request" error.

Feature #2495.
This commit is contained in:
Ben Pfaff
2010-04-20 11:00:58 -07:00
parent 76ce943239
commit 9deba63bde
2 changed files with 146 additions and 8 deletions
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35
include/openflow/nicira-ext.h
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@@ -49,6 +49,11 @@ enum nicira_type {
/* Use the high 32 bits of the cookie field as the tunnel ID in the flow
* match. */
NXT_TUN_ID_FROM_COOKIE,
/* Controller role support. The request body is struct nx_role_request.
* The reply echos the request. */
NXT_ROLE_REQUEST,
NXT_ROLE_REPLY
};
struct nicira_header {
@@ -67,6 +72,36 @@ struct nxt_tun_id_cookie {
};
OFP_ASSERT(sizeof(struct nxt_tun_id_cookie) == 24);
/* Configures the "role" of the sending controller. The default role is:
*
* - Other (NX_ROLE_OTHER), which allows the controller access to all
* OpenFlow features.
*
* The other possible roles are a related pair:
*
* - Master (NX_ROLE_MASTER) is equivalent to Other, except that there may
* be at most one Master controller at a time: when a controller
* configures itself as Master, any existing Master is demoted to the
* Slave role.
*
* - Slave (NX_ROLE_SLAVE) allows the controller read-only access to
* OpenFlow features. In particular attempts to modify the flow table
* will be rejected with an OFPBRC_EPERM error.
*
* Slave controllers also do not receive asynchronous messages
* (OFPT_PACKET_IN, OFPT_FLOW_REMOVED, OFPT_PORT_STATUS).
*/
struct nx_role_request {
struct nicira_header nxh;
uint32_t role; /* One of NX_ROLE_*. */
};
enum nx_role {
NX_ROLE_OTHER, /* Default role, full access. */
NX_ROLE_MASTER, /* Full access, at most one. */
NX_ROLE_SLAVE /* Read-only access. */
};
enum nx_action_subtype {
NXAST_SNAT__OBSOLETE, /* No longer used. */