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/* Copyright (c) 2015 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "patch.h"
#include "hash.h"
#include "lib/vswitch-idl.h"
#include "openvswitch/vlog.h"
#include "ovn-controller.h"
VLOG_DEFINE_THIS_MODULE(patch);
static char *
patch_port_name(const struct ovsrec_bridge *b1, const struct ovsrec_bridge *b2)
{
return xasprintf("patch-%s-to-%s", b1->name, b2->name);
}
/*
* Return true if the port is a patch port from b1 to b2
*/
static bool
match_patch_port(const struct ovsrec_port *port,
const struct ovsrec_bridge *b1,
const struct ovsrec_bridge *b2)
{
struct ovsrec_interface *iface;
size_t i;
char *peer_port_name;
bool res = false;
peer_port_name = patch_port_name(b2, b1);
for (i = 0; i < port->n_interfaces; i++) {
iface = port->interfaces[i];
if (strcmp(iface->type, "patch")) {
continue;
}
const char *peer;
peer = smap_get(&iface->options, "peer");
if (peer && !strcmp(peer, peer_port_name)) {
res = true;
break;
}
}
free(peer_port_name);
return res;
}
static void
create_patch_port(struct controller_ctx *ctx,
const char *network,
const struct ovsrec_bridge *b1,
const struct ovsrec_bridge *b2)
{
char *port_name = patch_port_name(b1, b2);
char *peer_port_name = patch_port_name(b2, b1);
ovsdb_idl_txn_add_comment(ctx->ovs_idl_txn,
"ovn-controller: creating patch port '%s' from '%s' to '%s'",
port_name, b1->name, b2->name);
struct ovsrec_interface *iface;
iface = ovsrec_interface_insert(ctx->ovs_idl_txn);
ovsrec_interface_set_name(iface, port_name);
ovsrec_interface_set_type(iface, "patch");
const struct smap options = SMAP_CONST1(&options, "peer", peer_port_name);
ovsrec_interface_set_options(iface, &options);
struct ovsrec_port *port;
port = ovsrec_port_insert(ctx->ovs_idl_txn);
ovsrec_port_set_name(port, port_name);
ovsrec_port_set_interfaces(port, &iface, 1);
const struct smap ids = SMAP_CONST1(&ids, "ovn-patch-port", network);
ovsrec_port_set_external_ids(port, &ids);
struct ovsrec_port **ports;
ports = xmalloc(sizeof *ports * (b1->n_ports + 1));
memcpy(ports, b1->ports, sizeof *ports * b1->n_ports);
ports[b1->n_ports] = port;
ovsrec_bridge_verify_ports(b1);
ovsrec_bridge_set_ports(b1, ports, b1->n_ports + 1);
free(ports);
free(port_name);
free(peer_port_name);
}
static void
create_patch_ports(struct controller_ctx *ctx,
const char *network,
struct shash *existing_ports,
const struct ovsrec_bridge *b1,
const struct ovsrec_bridge *b2)
{
size_t i;
for (i = 0; i < b1->n_ports; i++) {
if (match_patch_port(b1->ports[i], b1, b2)) {
/* Patch port already exists on b1 */
shash_find_and_delete(existing_ports, b1->ports[i]->name);
break;
}
}
if (i == b1->n_ports) {
create_patch_port(ctx, network, b1, b2);
}
}
static void
init_existing_ports(struct controller_ctx *ctx,
struct shash *existing_ports)
{
const struct ovsrec_port *port;
OVSREC_PORT_FOR_EACH (port, ctx->ovs_idl) {
if (smap_get(&port->external_ids, "ovn-patch-port")) {
shash_add(existing_ports, port->name, port);
}
}
}
static void
remove_port(struct controller_ctx *ctx,
const struct ovsrec_port *port)
{
const struct ovsrec_bridge *bridge;
/* We know the port we want to delete, but we have to find the bridge its
* on to do so. Note this only runs on a config change that should be
* pretty rare. */
OVSREC_BRIDGE_FOR_EACH (bridge, ctx->ovs_idl) {
size_t i;
for (i = 0; i < bridge->n_ports; i++) {
if (bridge->ports[i] != port) {
continue;
}
struct ovsrec_port **new_ports;
new_ports = xmemdup(bridge->ports,
sizeof *new_ports * (bridge->n_ports - 1));
if (i != bridge->n_ports - 1) {
/* Removed port was not last */
new_ports[i] = bridge->ports[bridge->n_ports - 1];
}
ovsrec_bridge_verify_ports(bridge);
ovsrec_bridge_set_ports(bridge, new_ports, bridge->n_ports - 1);
free(new_ports);
ovsrec_port_delete(port);
return;
}
}
}
static void
parse_bridge_mappings(struct controller_ctx *ctx,
const struct ovsrec_bridge *br_int,
const char *mappings_cfg)
{
struct shash existing_ports = SHASH_INITIALIZER(&existing_ports);
init_existing_ports(ctx, &existing_ports);
char *cur, *next, *start;
next = start = xstrdup(mappings_cfg);
while ((cur = strsep(&next, ",")) && *cur) {
char *network, *bridge = cur;
const struct ovsrec_bridge *ovs_bridge;
network = strsep(&bridge, ":");
if (!bridge || !*network || !*bridge) {
VLOG_ERR("Invalid ovn-bridge-mappings configuration: '%s'",
mappings_cfg);
break;
}
ovs_bridge = get_bridge(ctx->ovs_idl, bridge);
if (!ovs_bridge) {
VLOG_WARN("Bridge '%s' not found for network '%s'",
bridge, network);
continue;
}
create_patch_ports(ctx, network, &existing_ports, br_int, ovs_bridge);
create_patch_ports(ctx, network, &existing_ports, ovs_bridge, br_int);
}
free(start);
/* Any ports left in existing_ports are related to configuration that has
* been removed, so we should delete the ports now. */
struct shash_node *port_node, *port_next_node;
SHASH_FOR_EACH_SAFE (port_node, port_next_node, &existing_ports) {
struct ovsrec_port *port = port_node->data;
shash_delete(&existing_ports, port_node);
remove_port(ctx, port);
}
shash_destroy(&existing_ports);
}
void
patch_run(struct controller_ctx *ctx, const struct ovsrec_bridge *br_int)
{
if (!ctx->ovs_idl_txn) {
return;
}
const char *mappings_cfg = "";
const struct ovsrec_open_vswitch *cfg;
cfg = ovsrec_open_vswitch_first(ctx->ovs_idl);
if (cfg) {
mappings_cfg = smap_get(&cfg->external_ids, "ovn-bridge-mappings");
if (!mappings_cfg) {
mappings_cfg = "";
}
}
parse_bridge_mappings(ctx, br_int, mappings_cfg);
}
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