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"
29 #include "openflow/openflow.h"
32 #include "stream-ssl.h"
37 VLOG_DEFINE_THIS_MODULE(discovery)
42 bool update_resolv_conf;
44 struct dhclient *dhcp;
46 struct status_category *ss_cat;
49 static void modify_dhcp_request(struct dhcp_msg *, void *aux);
50 static bool validate_dhcp_offer(const struct dhcp_msg *, void *aux);
52 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(60, 60);
55 discovery_status_cb(struct status_reply *sr, void *d_)
57 struct discovery *d = d_;
59 status_reply_put(sr, "accept-remote=%s", d->re);
60 status_reply_put(sr, "n-changes=%d", d->n_changes);
62 status_reply_put(sr, "state=%s", dhclient_get_state(d->dhcp));
63 status_reply_put(sr, "state-elapsed=%u",
64 dhclient_get_state_elapsed(d->dhcp));
65 if (dhclient_is_bound(d->dhcp)) {
66 uint32_t ip = dhclient_get_ip(d->dhcp);
67 uint32_t netmask = dhclient_get_netmask(d->dhcp);
68 uint32_t router = dhclient_get_router(d->dhcp);
70 const struct dhcp_msg *cfg = dhclient_get_config(d->dhcp);
75 status_reply_put(sr, "ip="IP_FMT, IP_ARGS(&ip));
76 status_reply_put(sr, "netmask="IP_FMT, IP_ARGS(&netmask));
78 status_reply_put(sr, "router="IP_FMT, IP_ARGS(&router));
81 for (i = 0; dhcp_msg_get_ip(cfg, DHCP_CODE_DNS_SERVER, i,
84 status_reply_put(sr, "dns%d="IP_FMT, i, IP_ARGS(&dns_server));
87 domain_name = dhcp_msg_get_string(cfg, DHCP_CODE_DOMAIN_NAME);
89 status_reply_put(sr, "domain=%s", domain_name);
93 status_reply_put(sr, "lease-remaining=%u",
94 dhclient_get_lease_remaining(d->dhcp));
100 discovery_create(const char *re, bool update_resolv_conf,
101 struct wdp *wdp, struct switch_status *ss,
102 struct discovery **discoveryp)
108 d = xzalloc(sizeof *d);
110 d->dpif_name = xstrdup(wdp_base_name(wdp));
112 /* Controller regular expression. */
113 error = discovery_set_accept_controller_re(d, re);
117 d->update_resolv_conf = update_resolv_conf;
119 /* Initialize DHCP client. */
120 error = wdp_port_get_name(wdp, OFPP_LOCAL, &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);
130 VLOG_ERR("%s: failed to initialize DHCP client: %s",
131 d->dpif_name, strerror(error));
134 dhclient_set_max_timeout(d->dhcp, 3);
135 dhclient_init(d->dhcp, 0);
137 d->ss_cat = switch_status_register(ss, "discovery",
138 discovery_status_cb, d);
154 discovery_destroy(struct discovery *d)
160 dhclient_destroy(d->dhcp);
161 switch_status_unregister(d->ss_cat);
168 discovery_get_update_resolv_conf(const struct discovery *d)
170 return d->update_resolv_conf;
174 discovery_set_update_resolv_conf(struct discovery *d,
175 bool update_resolv_conf)
177 d->update_resolv_conf = update_resolv_conf;
181 discovery_get_accept_controller_re(const struct discovery *d)
187 discovery_set_accept_controller_re(struct discovery *d, const char *re_)
193 re = (!re_ ? xstrdup(stream_ssl_is_configured() ? "^ssl:.*" : "^tcp:.*")
194 : re_[0] == '^' ? xstrdup(re_) : xasprintf("^%s", re_));
195 regex = xmalloc(sizeof *regex);
196 error = regcomp(regex, re, REG_NOSUB | REG_EXTENDED);
198 size_t length = regerror(error, regex, NULL, 0);
199 char *buffer = xmalloc(length);
200 regerror(error, regex, buffer, length);
201 VLOG_WARN("%s: %s: %s", d->dpif_name, re, buffer);
219 discovery_question_connectivity(struct discovery *d)
222 dhclient_force_renew(d->dhcp, 15);
227 discovery_run(struct discovery *d, char **controller_name)
230 *controller_name = NULL;
234 dhclient_run(d->dhcp);
235 if (!dhclient_changed(d->dhcp)) {
239 dhclient_configure_netdev(d->dhcp);
240 if (d->update_resolv_conf) {
241 dhclient_update_resolv_conf(d->dhcp);
244 if (dhclient_is_bound(d->dhcp)) {
245 *controller_name = dhcp_msg_get_string(dhclient_get_config(d->dhcp),
246 DHCP_CODE_OFP_CONTROLLER_VCONN);
247 VLOG_INFO("%s: discovered controller %s",
248 d->dpif_name, *controller_name);
251 *controller_name = NULL;
253 VLOG_INFO("%s: discovered controller no longer available",
262 discovery_wait(struct discovery *d)
265 dhclient_wait(d->dhcp);
270 modify_dhcp_request(struct dhcp_msg *msg, void *aux OVS_UNUSED)
272 dhcp_msg_put_string(msg, DHCP_CODE_VENDOR_CLASS, "OpenFlow");
276 validate_dhcp_offer(const struct dhcp_msg *msg, void *d_)
278 const struct discovery *d = d_;
282 vconn_name = dhcp_msg_get_string(msg, DHCP_CODE_OFP_CONTROLLER_VCONN);
284 VLOG_WARN_RL(&rl, "%s: rejecting DHCP offer missing controller vconn",
288 accept = !regexec(d->regex, vconn_name, 0, NULL, 0);
290 VLOG_WARN_RL(&rl, "%s: rejecting controller vconn that fails to "
291 "match %s", d->dpif_name, d->re);