1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #include <assert.h>
28 #include <errno.h>
29 #include <libsysevent.h>
30 #include <sys/sysevent/eventdefs.h>
31 #include <sys/sysevent/dev.h>
32 #include <sys/types.h>
33 #include <libnvpair.h>
34 #include <string.h>
35 #include <unistd.h>
36
37 #include "events.h"
38 #include "ncp.h"
39 #include "ncu.h"
40 #include "objects.h"
41 #include "util.h"
42
43 /*
44 * sysevent_events.c - this file contains routines to retrieve sysevents
45 * from the system and package them for high level processing.
46 */
47
48 static sysevent_handle_t *sysevent_handle;
49
50 /*
51 * At present, we only handle EC_DEV_ADD/EC_DEV_REMOVE sysevents of
52 * subclass ESC_NETWORK. These signify hotplug addition/removal.
53 * For EC_DEV_ADD, we:
54 * - extract the driver/instance sysevent attributes
55 * - combine these to get interface name and create associated NCUs
56 * at the link/IP level if required
57 * - enable those instances
58 * For EC_DEV_REMOVE, we:
59 * - disable the associated link/IP NCUs
60 */
61 static void
sysevent_handler(sysevent_t * ev)62 sysevent_handler(sysevent_t *ev)
63 {
64 int32_t instance;
65 char *driver;
66 char if_name[LIFNAMSIZ];
67 boolean_t link_added;
68 nvlist_t *attr_list;
69 char *event_class = sysevent_get_class_name(ev);
70 char *event_subclass = sysevent_get_subclass_name(ev);
71 nwamd_event_t link_event = NULL;
72
73 nlog(LOG_DEBUG, "sysevent_handler: event %s/%s", event_class,
74 event_subclass);
75
76 /* Make sure sysevent is of expected class/subclass */
77 if ((strcmp(event_class, EC_DEV_ADD) != 0 &&
78 strcmp(event_class, EC_DEV_REMOVE) != 0) ||
79 strcmp(event_subclass, ESC_NETWORK) != 0) {
80 nlog(LOG_ERR, "sysevent_handler: unexpected sysevent "
81 "class/subclass %s/%s", event_class, event_subclass);
82 return;
83 }
84
85 link_added = (strcmp(event_class, EC_DEV_ADD) == 0);
86
87 /*
88 * Retrieve driver name and instance attributes, and combine to
89 * get interface name.
90 */
91 if (sysevent_get_attr_list(ev, &attr_list) != 0) {
92 nlog(LOG_ERR, "sysevent_handler: sysevent_get_attr_list: %m");
93 return;
94 }
95 if (nvlist_lookup_string(attr_list, DEV_DRIVER_NAME, &driver) != 0 ||
96 nvlist_lookup_int32(attr_list, DEV_INSTANCE, &instance) != 0) {
97 nlog(LOG_ERR, "sysevent_handler: nvlist_lookup "
98 "of attributes failed: %m");
99 nvlist_free(attr_list);
100 return;
101 }
102 (void) snprintf(if_name, LIFNAMSIZ, "%s%d", driver, instance);
103 nvlist_free(attr_list);
104
105 /* Ignore sysevent events for other zones */
106 if (!nwamd_link_belongs_to_this_zone(if_name))
107 return;
108
109 /* Create event for link */
110 link_event = nwamd_event_init_link_action(if_name,
111 link_added ? NWAM_ACTION_ADD : NWAM_ACTION_REMOVE);
112 if (link_event != NULL)
113 nwamd_event_enqueue(link_event);
114 }
115
116 /* ARGSUSED0 */
117 static void *
sysevent_initialization(void * arg)118 sysevent_initialization(void *arg)
119 {
120 const char *subclass = ESC_NETWORK;
121
122 do {
123 nwamd_escalate();
124 sysevent_handle = sysevent_bind_handle(sysevent_handler);
125 nwamd_deescalate();
126
127 (void) sleep(1);
128 } while (sysevent_handle == NULL);
129
130 /*
131 * Subscribe to ESC_NETWORK subclass of EC_DEV_ADD and EC_DEV_REMOVE
132 * events. As a result, we get sysevent notification of hotplug
133 * add/remove events, which we handle above in sysevent_handler().
134 */
135 if (sysevent_subscribe_event(sysevent_handle, EC_DEV_ADD, &subclass, 1)
136 != 0 ||
137 sysevent_subscribe_event(sysevent_handle, EC_DEV_REMOVE, &subclass,
138 1) != 0)
139 pfail("sysevent_subscribe_event: %s", strerror(errno));
140
141 return (NULL);
142 }
143
144 /*
145 * We can't initialize in the main thread because we may need to wait until
146 * svc:/system/sysevent:default finishes starting up. So we create a thread to
147 * initialize in.
148 */
149 void
nwamd_sysevent_events_init(void)150 nwamd_sysevent_events_init(void)
151 {
152 int rc;
153 pthread_attr_t attr;
154
155 rc = pthread_attr_init(&attr);
156 if (rc != 0) {
157 pfail("nwamd_sysevents_init: pthread_attr_init failed: %s",
158 strerror(rc));
159 }
160
161 rc = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
162 if (rc != 0) {
163 pfail("nwamd_sysevents_init: pthread_attr_setdetachstate "
164 "failed: %s", strerror(rc));
165 }
166
167 rc = pthread_create(NULL, &attr, sysevent_initialization, NULL);
168 if (rc != 0) {
169 pfail("nwamd_sysevents_init: couldn't start sysevent init "
170 "thread: %s", strerror(rc));
171 }
172
173 (void) pthread_attr_destroy(&attr);
174 }
175
176 void
nwamd_sysevent_events_fini(void)177 nwamd_sysevent_events_fini(void)
178 {
179 if (sysevent_handle != NULL) {
180 nwamd_escalate();
181 sysevent_unbind_handle(sysevent_handle);
182 nwamd_deescalate();
183 }
184 sysevent_handle = NULL;
185 }
186