2 * Copyright (c) 2008, 2009, 2010 Nicira Networks.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 #include "discovery.h"
21 #include <sys/socket.h>
26 #include "dhcp-client.h"
30 #include "openflow/openflow.h"
33 #include "stream-ssl.h"
36 VLOG_DEFINE_THIS_MODULE(discovery)
41 bool update_resolv_conf;
43 struct dhclient *dhcp;
45 struct status_category *ss_cat;
48 static void modify_dhcp_request(struct dhcp_msg *, void *aux);
49 static bool validate_dhcp_offer(const struct dhcp_msg *, void *aux);
51 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(60, 60);
54 discovery_status_cb(struct status_reply *sr, void *d_)
56 struct discovery *d = d_;
58 status_reply_put(sr, "accept-remote=%s", d->re);
59 status_reply_put(sr, "n-changes=%d", d->n_changes);
61 status_reply_put(sr, "state=%s", dhclient_get_state(d->dhcp));
62 status_reply_put(sr, "state-elapsed=%u",
63 dhclient_get_state_elapsed(d->dhcp));
64 if (dhclient_is_bound(d->dhcp)) {
65 uint32_t ip = dhclient_get_ip(d->dhcp);
66 uint32_t netmask = dhclient_get_netmask(d->dhcp);
67 uint32_t router = dhclient_get_router(d->dhcp);
69 const struct dhcp_msg *cfg = dhclient_get_config(d->dhcp);
74 status_reply_put(sr, "ip="IP_FMT, IP_ARGS(&ip));
75 status_reply_put(sr, "netmask="IP_FMT, IP_ARGS(&netmask));
77 status_reply_put(sr, "router="IP_FMT, IP_ARGS(&router));
80 for (i = 0; dhcp_msg_get_ip(cfg, DHCP_CODE_DNS_SERVER, i,
83 status_reply_put(sr, "dns%d="IP_FMT, i, IP_ARGS(&dns_server));
86 domain_name = dhcp_msg_get_string(cfg, DHCP_CODE_DOMAIN_NAME);
88 status_reply_put(sr, "domain=%s", domain_name);
92 status_reply_put(sr, "lease-remaining=%u",
93 dhclient_get_lease_remaining(d->dhcp));
99 discovery_create(const char *re, bool update_resolv_conf,
100 struct dpif *dpif, struct switch_status *ss,
101 struct discovery **discoveryp)
104 char local_name[IF_NAMESIZE];
107 d = xzalloc(sizeof *d);
109 d->dpif_name = xstrdup(dpif_base_name(dpif));
111 /* Controller regular expression. */
112 error = discovery_set_accept_controller_re(d, re);
116 d->update_resolv_conf = update_resolv_conf;
118 /* Initialize DHCP client. */
119 error = dpif_port_get_name(dpif, ODPP_LOCAL,
120 local_name, sizeof local_name);
122 VLOG_ERR("%s: failed to query datapath local port: %s",
123 d->dpif_name, strerror(error));
126 error = dhclient_create(local_name, modify_dhcp_request,
127 validate_dhcp_offer, d, &d->dhcp);
129 VLOG_ERR("%s: failed to initialize DHCP client: %s",
130 d->dpif_name, strerror(error));
133 dhclient_set_max_timeout(d->dhcp, 3);
134 dhclient_init(d->dhcp, 0);
136 d->ss_cat = switch_status_register(ss, "discovery",
137 discovery_status_cb, d);
153 discovery_destroy(struct discovery *d)
159 dhclient_destroy(d->dhcp);
160 switch_status_unregister(d->ss_cat);
167 discovery_get_update_resolv_conf(const struct discovery *d)
169 return d->update_resolv_conf;
173 discovery_set_update_resolv_conf(struct discovery *d,
174 bool update_resolv_conf)
176 d->update_resolv_conf = update_resolv_conf;
180 discovery_get_accept_controller_re(const struct discovery *d)
186 discovery_set_accept_controller_re(struct discovery *d, const char *re_)
192 re = (!re_ ? xstrdup(stream_ssl_is_configured() ? "^ssl:.*" : "^tcp:.*")
193 : re_[0] == '^' ? xstrdup(re_) : xasprintf("^%s", re_));
194 regex = xmalloc(sizeof *regex);
195 error = regcomp(regex, re, REG_NOSUB | REG_EXTENDED);
197 size_t length = regerror(error, regex, NULL, 0);
198 char *buffer = xmalloc(length);
199 regerror(error, regex, buffer, length);
200 VLOG_WARN("%s: %s: %s", d->dpif_name, re, buffer);
218 discovery_question_connectivity(struct discovery *d)
221 dhclient_force_renew(d->dhcp, 15);
226 discovery_run(struct discovery *d, char **controller_name)
229 *controller_name = NULL;
233 dhclient_run(d->dhcp);
234 if (!dhclient_changed(d->dhcp)) {
238 dhclient_configure_netdev(d->dhcp);
239 if (d->update_resolv_conf) {
240 dhclient_update_resolv_conf(d->dhcp);
243 if (dhclient_is_bound(d->dhcp)) {
244 *controller_name = dhcp_msg_get_string(dhclient_get_config(d->dhcp),
245 DHCP_CODE_OFP_CONTROLLER_VCONN);
246 VLOG_INFO("%s: discovered controller %s",
247 d->dpif_name, *controller_name);
250 *controller_name = NULL;
252 VLOG_INFO("%s: discovered controller no longer available",
261 discovery_wait(struct discovery *d)
264 dhclient_wait(d->dhcp);
269 modify_dhcp_request(struct dhcp_msg *msg, void *aux OVS_UNUSED)
271 dhcp_msg_put_string(msg, DHCP_CODE_VENDOR_CLASS, "OpenFlow");
275 validate_dhcp_offer(const struct dhcp_msg *msg, void *d_)
277 const struct discovery *d = d_;
281 vconn_name = dhcp_msg_get_string(msg, DHCP_CODE_OFP_CONTROLLER_VCONN);
283 VLOG_WARN_RL(&rl, "%s: rejecting DHCP offer missing controller vconn",
287 accept = !regexec(d->regex, vconn_name, 0, NULL, 0);
289 VLOG_WARN_RL(&rl, "%s: rejecting controller vconn that fails to "
290 "match %s", d->dpif_name, d->re);