sysevent_events.c revision 11918:567043034562 
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
48static 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 */
61static void
62sysevent_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 */
117static void *
118sysevent_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 */
149void
150nwamd_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
176void
177nwamd_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