2 * Copyright (c) 2008, 2009 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"
25 #include "dhcp-client.h"
29 #include "openflow/openflow.h"
32 #include "vconn-ssl.h"
34 #define THIS_MODULE VLM_discovery
39 bool update_resolv_conf;
41 struct dhclient *dhcp;
43 struct status_category *ss_cat;
46 static void modify_dhcp_request(struct dhcp_msg *, void *aux);
47 static bool validate_dhcp_offer(const struct dhcp_msg *, void *aux);
49 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(60, 60);
52 discovery_status_cb(struct status_reply *sr, void *d_)
54 struct discovery *d = d_;
56 status_reply_put(sr, "accept-remote=%s", d->re);
57 status_reply_put(sr, "n-changes=%d", d->n_changes);
59 status_reply_put(sr, "state=%s", dhclient_get_state(d->dhcp));
60 status_reply_put(sr, "state-elapsed=%u",
61 dhclient_get_state_elapsed(d->dhcp));
62 if (dhclient_is_bound(d->dhcp)) {
63 uint32_t ip = dhclient_get_ip(d->dhcp);
64 uint32_t netmask = dhclient_get_netmask(d->dhcp);
65 uint32_t router = dhclient_get_router(d->dhcp);
67 const struct dhcp_msg *cfg = dhclient_get_config(d->dhcp);
72 status_reply_put(sr, "ip="IP_FMT, IP_ARGS(&ip));
73 status_reply_put(sr, "netmask="IP_FMT, IP_ARGS(&netmask));
75 status_reply_put(sr, "router="IP_FMT, IP_ARGS(&router));
78 for (i = 0; dhcp_msg_get_ip(cfg, DHCP_CODE_DNS_SERVER, i,
81 status_reply_put(sr, "dns%d="IP_FMT, i, IP_ARGS(&dns_server));
84 domain_name = dhcp_msg_get_string(cfg, DHCP_CODE_DOMAIN_NAME);
86 status_reply_put(sr, "domain=%s", domain_name);
90 status_reply_put(sr, "lease-remaining=%u",
91 dhclient_get_lease_remaining(d->dhcp));
97 discovery_create(const char *re, bool update_resolv_conf,
98 struct dpif *dpif, struct switch_status *ss,
99 struct discovery **discoveryp)
102 char local_name[IF_NAMESIZE];
105 d = xcalloc(1, sizeof *d);
107 /* Controller regular expression. */
108 error = discovery_set_accept_controller_re(d, re);
112 d->update_resolv_conf = update_resolv_conf;
114 /* Initialize DHCP client. */
115 error = dpif_get_name(dpif, local_name, sizeof local_name);
117 VLOG_ERR("failed to query datapath local port: %s", strerror(error));
120 error = dhclient_create(local_name, modify_dhcp_request,
121 validate_dhcp_offer, d, &d->dhcp);
123 VLOG_ERR("failed to initialize DHCP client: %s", strerror(error));
126 dhclient_set_max_timeout(d->dhcp, 3);
127 dhclient_init(d->dhcp, 0);
129 d->ss_cat = switch_status_register(ss, "discovery",
130 discovery_status_cb, d);
145 discovery_destroy(struct discovery *d)
151 dhclient_destroy(d->dhcp);
152 switch_status_unregister(d->ss_cat);
158 discovery_set_update_resolv_conf(struct discovery *d,
159 bool update_resolv_conf)
161 d->update_resolv_conf = update_resolv_conf;
165 discovery_set_accept_controller_re(struct discovery *d, const char *re_)
171 re = (!re_ ? xstrdup(vconn_ssl_is_configured() ? "^ssl:.*" : ".*")
172 : re_[0] == '^' ? xstrdup(re_) : xasprintf("^%s", re_));
173 regex = xmalloc(sizeof *regex);
174 error = regcomp(regex, re, REG_NOSUB | REG_EXTENDED);
176 size_t length = regerror(error, regex, NULL, 0);
177 char *buffer = xmalloc(length);
178 regerror(error, regex, buffer, length);
179 VLOG_WARN("%s: %s", re, buffer);
197 discovery_question_connectivity(struct discovery *d)
200 dhclient_force_renew(d->dhcp, 15);
205 discovery_run(struct discovery *d, char **controller_name)
208 *controller_name = NULL;
212 dhclient_run(d->dhcp);
213 if (!dhclient_changed(d->dhcp)) {
217 dhclient_configure_netdev(d->dhcp);
218 if (d->update_resolv_conf) {
219 dhclient_update_resolv_conf(d->dhcp);
222 if (dhclient_is_bound(d->dhcp)) {
223 *controller_name = dhcp_msg_get_string(dhclient_get_config(d->dhcp),
224 DHCP_CODE_OFP_CONTROLLER_VCONN);
225 VLOG_INFO("%s: discovered controller", *controller_name);
228 *controller_name = NULL;
230 VLOG_INFO("discovered controller no longer available");
238 discovery_wait(struct discovery *d)
241 dhclient_wait(d->dhcp);
246 modify_dhcp_request(struct dhcp_msg *msg, void *aux UNUSED)
248 dhcp_msg_put_string(msg, DHCP_CODE_VENDOR_CLASS, "OpenFlow");
252 validate_dhcp_offer(const struct dhcp_msg *msg, void *d_)
254 const struct discovery *d = d_;
258 vconn_name = dhcp_msg_get_string(msg, DHCP_CODE_OFP_CONTROLLER_VCONN);
260 VLOG_WARN_RL(&rl, "rejecting DHCP offer missing controller vconn");
263 accept = !regexec(d->regex, vconn_name, 0, NULL, 0);
265 VLOG_WARN_RL(&rl, "rejecting controller vconn that fails to match %s",