252 lines
7.8 KiB
C
252 lines
7.8 KiB
C
/* Copyright (c) 2008, 2009 The Board of Trustees of The Leland Stanford
|
|
* Junior University
|
|
*
|
|
* We are making the OpenFlow specification and associated documentation
|
|
* (Software) available for public use and benefit with the expectation
|
|
* that others will use, modify and enhance the Software and contribute
|
|
* those enhancements back to the community. However, since we would
|
|
* like to make the Software available for broadest use, with as few
|
|
* restrictions as possible permission is hereby granted, free of
|
|
* charge, to any person obtaining a copy of this Software to deal in
|
|
* the Software under the copyrights without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*
|
|
* The name and trademarks of copyright holder(s) may NOT be used in
|
|
* advertising or publicity pertaining to the Software or any
|
|
* derivatives without specific, written prior permission.
|
|
*/
|
|
|
|
#include <config.h>
|
|
#include "discovery.h"
|
|
#include <inttypes.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include "dhcp-client.h"
|
|
#include "dhcp.h"
|
|
#include "netdev.h"
|
|
#include "openflow/openflow.h"
|
|
#include "packets.h"
|
|
#include "port-watcher.h"
|
|
#include "secchan.h"
|
|
#include "status.h"
|
|
|
|
#define THIS_MODULE VLM_discovery
|
|
#include "vlog.h"
|
|
|
|
struct discovery
|
|
{
|
|
const struct settings *s;
|
|
struct dhclient *dhcp;
|
|
int n_changes;
|
|
};
|
|
|
|
static void modify_dhcp_request(struct dhcp_msg *, void *aux);
|
|
static bool validate_dhcp_offer(const struct dhcp_msg *, void *aux);
|
|
|
|
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(60, 60);
|
|
|
|
static void
|
|
discovery_status_cb(struct status_reply *sr, void *d_)
|
|
{
|
|
struct discovery *d = d_;
|
|
|
|
status_reply_put(sr, "accept-remote=%s", d->s->accept_controller_re);
|
|
status_reply_put(sr, "n-changes=%d", d->n_changes);
|
|
if (d->dhcp) {
|
|
status_reply_put(sr, "state=%s", dhclient_get_state(d->dhcp));
|
|
status_reply_put(sr, "state-elapsed=%u",
|
|
dhclient_get_state_elapsed(d->dhcp));
|
|
if (dhclient_is_bound(d->dhcp)) {
|
|
uint32_t ip = dhclient_get_ip(d->dhcp);
|
|
uint32_t netmask = dhclient_get_netmask(d->dhcp);
|
|
uint32_t router = dhclient_get_router(d->dhcp);
|
|
|
|
const struct dhcp_msg *cfg = dhclient_get_config(d->dhcp);
|
|
uint32_t dns_server;
|
|
char *domain_name;
|
|
int i;
|
|
|
|
status_reply_put(sr, "ip="IP_FMT, IP_ARGS(&ip));
|
|
status_reply_put(sr, "netmask="IP_FMT, IP_ARGS(&netmask));
|
|
if (router) {
|
|
status_reply_put(sr, "router="IP_FMT, IP_ARGS(&router));
|
|
}
|
|
|
|
for (i = 0; dhcp_msg_get_ip(cfg, DHCP_CODE_DNS_SERVER, i,
|
|
&dns_server);
|
|
i++) {
|
|
status_reply_put(sr, "dns%d="IP_FMT, i, IP_ARGS(&dns_server));
|
|
}
|
|
|
|
domain_name = dhcp_msg_get_string(cfg, DHCP_CODE_DOMAIN_NAME);
|
|
if (domain_name) {
|
|
status_reply_put(sr, "domain=%s", domain_name);
|
|
free(domain_name);
|
|
}
|
|
|
|
status_reply_put(sr, "lease-remaining=%u",
|
|
dhclient_get_lease_remaining(d->dhcp));
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
discovery_local_port_cb(const struct ofp_phy_port *port, void *d_)
|
|
{
|
|
struct discovery *d = d_;
|
|
if (port) {
|
|
char name[OFP_MAX_PORT_NAME_LEN + 1];
|
|
struct netdev *netdev;
|
|
int retval;
|
|
|
|
/* Check that this was really a change. */
|
|
get_port_name(port, name, sizeof name);
|
|
if (d->dhcp && !strcmp(netdev_get_name(dhclient_get_netdev(d->dhcp)),
|
|
name)) {
|
|
return;
|
|
}
|
|
|
|
/* Destroy current DHCP client. */
|
|
dhclient_destroy(d->dhcp);
|
|
d->dhcp = NULL;
|
|
|
|
/* Bring local network device up. */
|
|
retval = netdev_open(name, NETDEV_ETH_TYPE_NONE, &netdev);
|
|
if (retval) {
|
|
VLOG_ERR("Could not open %s device, discovery disabled: %s",
|
|
name, strerror(retval));
|
|
return;
|
|
}
|
|
retval = netdev_turn_flags_on(netdev, NETDEV_UP, true);
|
|
if (retval) {
|
|
VLOG_ERR("Could not bring %s device up, discovery disabled: %s",
|
|
name, strerror(retval));
|
|
return;
|
|
}
|
|
netdev_close(netdev);
|
|
|
|
/* Initialize DHCP client. */
|
|
retval = dhclient_create(name, modify_dhcp_request,
|
|
validate_dhcp_offer, (void *) d->s, &d->dhcp);
|
|
if (retval) {
|
|
VLOG_ERR("Failed to initialize DHCP client, "
|
|
"discovery disabled: %s", strerror(retval));
|
|
return;
|
|
}
|
|
dhclient_set_max_timeout(d->dhcp, 3);
|
|
dhclient_init(d->dhcp, 0);
|
|
} else {
|
|
dhclient_destroy(d->dhcp);
|
|
d->dhcp = NULL;
|
|
}
|
|
}
|
|
|
|
|
|
struct discovery *
|
|
discovery_init(const struct settings *s, struct port_watcher *pw,
|
|
struct switch_status *ss)
|
|
{
|
|
struct discovery *d;
|
|
|
|
d = xmalloc(sizeof *d);
|
|
d->s = s;
|
|
d->dhcp = NULL;
|
|
d->n_changes = 0;
|
|
|
|
switch_status_register_category(ss, "discovery", discovery_status_cb, d);
|
|
port_watcher_register_local_port_callback(pw, discovery_local_port_cb, d);
|
|
|
|
return d;
|
|
}
|
|
|
|
void
|
|
discovery_question_connectivity(struct discovery *d)
|
|
{
|
|
if (d->dhcp) {
|
|
dhclient_force_renew(d->dhcp, 15);
|
|
}
|
|
}
|
|
|
|
bool
|
|
discovery_run(struct discovery *d, char **controller_name)
|
|
{
|
|
if (!d->dhcp) {
|
|
*controller_name = NULL;
|
|
return true;
|
|
}
|
|
|
|
dhclient_run(d->dhcp);
|
|
if (!dhclient_changed(d->dhcp)) {
|
|
return false;
|
|
}
|
|
|
|
dhclient_configure_netdev(d->dhcp);
|
|
if (d->s->update_resolv_conf) {
|
|
dhclient_update_resolv_conf(d->dhcp);
|
|
}
|
|
|
|
if (dhclient_is_bound(d->dhcp)) {
|
|
*controller_name = dhcp_msg_get_string(dhclient_get_config(d->dhcp),
|
|
DHCP_CODE_OFP_CONTROLLER_VCONN);
|
|
VLOG_INFO("%s: discovered controller", *controller_name);
|
|
d->n_changes++;
|
|
} else {
|
|
*controller_name = NULL;
|
|
if (d->n_changes) {
|
|
VLOG_INFO("discovered controller no longer available");
|
|
d->n_changes++;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void
|
|
discovery_wait(struct discovery *d)
|
|
{
|
|
if (d->dhcp) {
|
|
dhclient_wait(d->dhcp);
|
|
}
|
|
}
|
|
|
|
static void
|
|
modify_dhcp_request(struct dhcp_msg *msg, void *aux UNUSED)
|
|
{
|
|
dhcp_msg_put_string(msg, DHCP_CODE_VENDOR_CLASS, "OpenFlow");
|
|
}
|
|
|
|
static bool
|
|
validate_dhcp_offer(const struct dhcp_msg *msg, void *s_)
|
|
{
|
|
const struct settings *s = s_;
|
|
char *vconn_name;
|
|
bool accept;
|
|
|
|
vconn_name = dhcp_msg_get_string(msg, DHCP_CODE_OFP_CONTROLLER_VCONN);
|
|
if (!vconn_name) {
|
|
VLOG_WARN_RL(&rl, "rejecting DHCP offer missing controller vconn");
|
|
return false;
|
|
}
|
|
accept = !regexec(&s->accept_controller_regex, vconn_name, 0, NULL, 0);
|
|
if (!accept) {
|
|
VLOG_WARN_RL(&rl, "rejecting controller vconn that fails to match %s",
|
|
s->accept_controller_re);
|
|
}
|
|
free(vconn_name);
|
|
return accept;
|
|
}
|