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 (c) 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25
26 #include <arpa/inet.h>
27 #include <assert.h>
28 #include <fcntl.h>
29 #include <libdlpi.h>
30 #include <libnwam.h>
31 #include <net/if.h>
32 #include <pthread.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <sys/fcntl.h>
37 #include <unistd.h>
38
39 #include "events.h"
40 #include "ncp.h"
41 #include "ncu.h"
42 #include "objects.h"
43 #include "util.h"
44
45 /*
46 * dlpi_events.c - this file contains routines to retrieve
47 * DL_NOTE_LINK_[UP|DOWN] events from the system and packages them for high
48 * level processing. Holding a dlpi_handle to a link prevents the
49 * associated driver unloading that can happen when IP is not plumbed,
50 * so it is vital to ensure that the handle is open for the lifetime
51 * of the WiFi connection.
52 */
53
54 /*
55 * This is a callback function executed when dlpi_recv() gets a DL_NOTE_LINK_UP.
56 * It packages up the event for consumption by the link state machine.
57 */
58 /* ARGSUSED0 */
59 static void
nwamd_dlpi_notify(dlpi_handle_t dhp,dlpi_notifyinfo_t * info,void * arg)60 nwamd_dlpi_notify(dlpi_handle_t dhp, dlpi_notifyinfo_t *info, void *arg)
61 {
62 nwamd_event_t ev;
63 char *name = arg;
64
65 if (info->dni_note & DL_NOTE_LINK_UP)
66 ev = nwamd_event_init_link_state(name, B_TRUE);
67 else
68 ev = nwamd_event_init_link_state(name, B_FALSE);
69 if (ev != NULL)
70 nwamd_event_enqueue(ev);
71 }
72
73 /*
74 * We are only intested in DL_NOTE_LINK_UP events which we've registered for
75 * in nwamd_dlpi_add_link(). But we have to keep calling dlpi_recv() to
76 * force the notification callback to be executed.
77 */
78 static void *
nwamd_dlpi_thread(void * arg)79 nwamd_dlpi_thread(void *arg)
80 {
81 int rc;
82 dlpi_handle_t *dh = arg;
83
84 do {
85 rc = dlpi_recv(*dh, NULL, NULL, NULL, NULL, -1, NULL);
86 } while (rc == DLPI_SUCCESS);
87 nlog(LOG_ERR, "dlpi_recv failed: %s", dlpi_strerror(rc));
88 return (NULL);
89 }
90
91 /*
92 * This is called when we want to start receiving notifications from state
93 * changes on a link.
94 */
95 void
nwamd_dlpi_add_link(nwamd_object_t obj)96 nwamd_dlpi_add_link(nwamd_object_t obj)
97 {
98 nwamd_ncu_t *ncu = obj->nwamd_object_data;
99 nwamd_link_t *link;
100 dlpi_notifyid_t id;
101 int rc;
102
103 nlog(LOG_DEBUG, "nwamd_dlpi_add_link: ncu %p (%s) type %d",
104 ncu, obj->nwamd_object_name, ncu != NULL ? ncu->ncu_type : -1);
105
106 assert(ncu != NULL && ncu->ncu_type == NWAM_NCU_TYPE_LINK);
107
108 link = &ncu->ncu_link;
109
110 /* Already running? */
111 if (link->nwamd_link_dlpi_thread != 0) {
112 nlog(LOG_DEBUG, "nwamd_dlpi_add_link(%s) already running",
113 obj->nwamd_object_name);
114 return;
115 }
116
117 rc = dlpi_open(ncu->ncu_name, &link->nwamd_link_dhp, 0);
118 if (rc != DLPI_SUCCESS) {
119 nlog(LOG_ERR, "nwamd_dlpi_add_link: dlpi_open(%s) = %s",
120 ncu->ncu_name, dlpi_strerror(rc));
121 return;
122 }
123
124 nwamd_set_unset_link_properties(ncu, B_TRUE);
125
126 rc = dlpi_enabnotify(link->nwamd_link_dhp,
127 DL_NOTE_LINK_UP | DL_NOTE_LINK_DOWN, nwamd_dlpi_notify,
128 ncu->ncu_name, &id);
129 if (rc != DLPI_SUCCESS) {
130 nlog(LOG_ERR,
131 "nwamd_dlpi_add_link: dlpi_enabnotify(%s) = %s",
132 obj->nwamd_object_name, dlpi_strerror(rc));
133 dlpi_close(link->nwamd_link_dhp);
134 return;
135 }
136
137 rc = pthread_create(&link->nwamd_link_dlpi_thread, NULL,
138 nwamd_dlpi_thread, &link->nwamd_link_dhp);
139 if (rc != 0) {
140 nlog(LOG_ERR, "nwamd_dlpi_add_link: couldn't create "
141 "dlpi thread for %s: %s", obj->nwamd_object_name,
142 strerror(rc));
143 dlpi_close(link->nwamd_link_dhp);
144 }
145 }
146
147 /*
148 * This function is called when we are no longer interested in receiving
149 * notification from state changes on a link.
150 */
151 void
nwamd_dlpi_delete_link(nwamd_object_t obj)152 nwamd_dlpi_delete_link(nwamd_object_t obj)
153 {
154 nwamd_ncu_t *ncu = obj->nwamd_object_data;
155
156 nlog(LOG_DEBUG, "nwamd_dlpi_delete_link: ncu %p (%s) type %d",
157 ncu, obj->nwamd_object_name, ncu != NULL ? ncu->ncu_type : -1);
158
159 if (ncu->ncu_link.nwamd_link_dlpi_thread != 0) {
160 (void) pthread_cancel(
161 ncu->ncu_link.nwamd_link_dlpi_thread);
162 (void) pthread_join(ncu->ncu_link.nwamd_link_dlpi_thread, NULL);
163 ncu->ncu_link.nwamd_link_dlpi_thread = 0;
164 /* Unset properties before closing */
165 nwamd_set_unset_link_properties(ncu, B_FALSE);
166 }
167
168 dlpi_close(ncu->ncu_link.nwamd_link_dhp);
169 ncu->ncu_link.nwamd_link_dhp = NULL;
170 }
171