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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 "gateway.h"
#include "lib/poll-loop.h"
#include "lib/simap.h"
#include "lib/sset.h"
#include "lib/util.h"
#include "openvswitch/vlog.h"
#include "ovn/lib/ovn-sb-idl.h"
#include "vtep/vtep-idl.h"
#include "ovn-controller-vtep.h"
VLOG_DEFINE_THIS_MODULE(gateway);
/*
* Registers the physical switches in vtep to ovnsb as chassis. For each
* physical switch in the vtep database, finds all vtep logical switches that
* are associated with the physical switch, and updates the corresponding
* chassis's 'vtep_logical_switches' column.
*
*/
/* Global revalidation sequence number, incremented at each call to
* 'revalidate_gateway()'. */
static unsigned int gw_reval_seq;
/* Maps all chassis created by the gateway module to their own reval_seq. */
static struct simap gw_chassis_map = SIMAP_INITIALIZER(&gw_chassis_map);
/* Creates and returns a new instance of 'struct sbrec_chassis'. */
static const struct sbrec_chassis *
create_chassis_rec(struct ovsdb_idl_txn *txn, const char *name,
const char *encap_ip)
{
const struct sbrec_chassis *chassis_rec;
struct sbrec_encap *encap_rec;
VLOG_INFO("add Chassis row for VTEP physical switch (%s)", name);
chassis_rec = sbrec_chassis_insert(txn);
sbrec_chassis_set_name(chassis_rec, name);
encap_rec = sbrec_encap_insert(txn);
sbrec_encap_set_type(encap_rec, OVN_SB_ENCAP_TYPE);
sbrec_encap_set_ip(encap_rec, encap_ip);
const struct smap options = SMAP_CONST1(&options, "csum", "false");
sbrec_encap_set_options(encap_rec, &options);
sbrec_chassis_set_encaps(chassis_rec, &encap_rec, 1);
return chassis_rec;
}
/* Revalidates chassis in ovnsb against vtep database. Creates chassis for
* new vtep physical switch. And removes chassis which no longer have
* physical switch in vtep.
*
* xxx: Support multiple tunnel encaps.
*
* */
static void
revalidate_gateway(struct controller_vtep_ctx *ctx)
{
const struct vteprec_physical_switch *pswitch;
/* Increments the global revalidation sequence number. */
gw_reval_seq++;
ovsdb_idl_txn_add_comment(ctx->ovnsb_idl_txn,
"ovn-controller-vtep: updating vtep chassis");
VTEPREC_PHYSICAL_SWITCH_FOR_EACH (pswitch, ctx->vtep_idl) {
const struct sbrec_chassis *chassis_rec;
struct simap_node *gw_node;
const char *encap_ip;
encap_ip = pswitch->n_tunnel_ips ? pswitch->tunnel_ips[0] : "";
gw_node = simap_find(&gw_chassis_map, pswitch->name);
chassis_rec = get_chassis_by_name(ctx->ovnsb_idl, pswitch->name);
if (chassis_rec) {
if (!gw_node &&
(strcmp(chassis_rec->encaps[0]->type, OVN_SB_ENCAP_TYPE)
|| strcmp(chassis_rec->encaps[0]->ip, encap_ip))) {
VLOG_WARN("Chassis config changing on startup, make sure "
"multiple chassis are not configured : %s/%s->%s/%s",
chassis_rec->encaps[0]->type,
chassis_rec->encaps[0]->ip,
OVN_SB_ENCAP_TYPE, encap_ip);
}
/* Updates chassis's encap if anything changed. */
if (strcmp(chassis_rec->encaps[0]->type, OVN_SB_ENCAP_TYPE)) {
VLOG_WARN("Chassis for VTEP physical switch (%s) can only have "
"encap type \"%s\"", pswitch->name, OVN_SB_ENCAP_TYPE);
sbrec_encap_set_type(chassis_rec->encaps[0], OVN_SB_ENCAP_TYPE);
}
if (strcmp(chassis_rec->encaps[0]->ip, encap_ip)) {
sbrec_encap_set_ip(chassis_rec->encaps[0], encap_ip);
}
if (smap_get_bool(&chassis_rec->encaps[0]->options, "csum", true)) {
const struct smap options = SMAP_CONST1(&options, "csum",
"false");
sbrec_encap_set_options(chassis_rec->encaps[0], &options);
}
} else {
if (gw_node) {
VLOG_WARN("Chassis for VTEP physical switch (%s) disappears, "
"maybe deleted by ovn-sbctl, adding it back",
pswitch->name);
}
/* Creates a new chassis for the VTEP physical switch. */
create_chassis_rec(ctx->ovnsb_idl_txn, pswitch->name, encap_ip);
}
/* Updates or creates the simap node for 'pswitch->name'. */
simap_put(&gw_chassis_map, pswitch->name, gw_reval_seq);
}
struct simap_node *iter, *next;
/* For 'gw_node' in 'gw_chassis_map' whose data is not
* 'gw_reval_seq', it means the corresponding physical switch no
* longer exist. So, garbage collects them. */
SIMAP_FOR_EACH_SAFE (iter, next, &gw_chassis_map) {
if (iter->data != gw_reval_seq) {
const struct sbrec_chassis *chassis_rec;
chassis_rec = get_chassis_by_name(ctx->ovnsb_idl, iter->name);
if (chassis_rec) {
sbrec_chassis_delete(chassis_rec);
}
simap_delete(&gw_chassis_map, iter);
}
}
}
/* Updates the 'vtep_logical_switches' column in the Chassis table based
* on vtep database configuration. */
static void
update_vtep_logical_switches(struct controller_vtep_ctx *ctx)
{
const struct vteprec_physical_switch *pswitch;
ovsdb_idl_txn_add_comment(ctx->ovnsb_idl_txn, "ovn-controller-vtep: "
"updating chassis's vtep_logical_switches");
VTEPREC_PHYSICAL_SWITCH_FOR_EACH (pswitch, ctx->vtep_idl) {
const struct sbrec_chassis *chassis_rec =
get_chassis_by_name(ctx->ovnsb_idl, pswitch->name);
struct sset lswitches = SSET_INITIALIZER(&lswitches);
size_t i;
for (i = 0; i < pswitch->n_ports; i++) {
const struct vteprec_physical_port *port = pswitch->ports[i];
size_t j;
for (j = 0; j < port->n_vlan_bindings; j++) {
const struct vteprec_logical_switch *vtep_lswitch;
vtep_lswitch = port->value_vlan_bindings[j];
/* If not already in 'lswitches', records it. */
if (!sset_find(&lswitches, vtep_lswitch->name)) {
sset_add(&lswitches, vtep_lswitch->name);
}
}
}
const char **ls_arr = sset_array(&lswitches);
sbrec_chassis_set_vtep_logical_switches(chassis_rec, ls_arr,
sset_count(&lswitches));
free(ls_arr);
sset_destroy(&lswitches);
}
}
void
gateway_run(struct controller_vtep_ctx *ctx)
{
if (!ctx->ovnsb_idl_txn) {
return;
}
revalidate_gateway(ctx);
update_vtep_logical_switches(ctx);
}
/* Destroys the chassis table entries for vtep physical switches.
* Returns true when done (i.e. there is no change made to 'ctx->ovnsb_idl'),
* otherwise returns false. */
bool
gateway_cleanup(struct controller_vtep_ctx *ctx)
{
static bool simap_destroyed = false;
const struct vteprec_physical_switch *pswitch;
if (!ctx->ovnsb_idl_txn) {
return false;
}
bool all_done = true;
ovsdb_idl_txn_add_comment(ctx->ovnsb_idl_txn, "ovn-controller-vtep: "
"unregistering vtep chassis");
VTEPREC_PHYSICAL_SWITCH_FOR_EACH (pswitch, ctx->vtep_idl) {
const struct sbrec_chassis *chassis_rec;
chassis_rec = get_chassis_by_name(ctx->ovnsb_idl, pswitch->name);
if (!chassis_rec) {
continue;
}
all_done = false;
sbrec_chassis_delete(chassis_rec);
}
if (!simap_destroyed) {
simap_destroy(&gw_chassis_map);
simap_destroyed = true;
}
return all_done;
}
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