vcs.maemo.org Git - connman/blob - plugins/ethernet.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2008  Intel Corporation. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <unistd.h>
  27 #include <string.h>
  28 #include <sys/socket.h>
  29 #include <linux/if.h>
  30 #include <linux/netlink.h>
  31 #include <linux/rtnetlink.h>
  32
  33 #include <connman/plugin.h>
  34 #include <connman/driver.h>
  35 #include <connman/log.h>
  36
  37 static GStaticMutex ethernet_mutex = G_STATIC_MUTEX_INIT;
  38 static GSList *ethernet_list = NULL;
  39
  40 static GStaticMutex element_mutex = G_STATIC_MUTEX_INIT;
  41 static GSList *element_list = NULL;
  42
  43 static void create_element(struct connman_element *parent,
  44                                         enum connman_element_type type)
  45 {
  46         struct connman_element *element;
  47
  48         DBG("parent %p name %s", parent, parent->name);
  49
  50         element = connman_element_create();
  51
  52         element->type = type;
  53         element->netdev.index = parent->netdev.index;
  54         element->netdev.name = g_strdup(parent->netdev.name);
  55
  56         g_static_mutex_lock(&element_mutex);
  57         element_list = g_slist_append(element_list, element);
  58         g_static_mutex_unlock(&element_mutex);
  59
  60         connman_element_register(element, parent);
  61 }
  62
  63 static void remove_elements(struct connman_element *parent)
  64 {
  65         GSList *list;
  66
  67         DBG("parent %p name %s", parent, parent->name);
  68
  69         g_static_mutex_lock(&element_mutex);
  70
  71         for (list = element_list; list; list = list->next) {
  72                 struct connman_element *element = list->data;
  73
  74                 if (element->netdev.index != parent->netdev.index)
  75                         continue;
  76
  77                 element_list = g_slist_remove(element_list, element);
  78
  79                 connman_element_unregister(element);
  80
  81                 connman_element_unref(element);
  82         }
  83
  84         g_static_mutex_unlock(&element_mutex);
  85 }
  86
  87 static void rtnl_link(struct nlmsghdr *hdr, const char *type)
  88 {
  89         GSList *list;
  90         struct ifinfomsg *msg;
  91         int bytes;
  92
  93         msg = (struct ifinfomsg *) NLMSG_DATA(hdr);
  94         bytes = IFLA_PAYLOAD(hdr);
  95
  96         DBG("%s ifi_index %d ifi_flags 0x%04x",
  97                                 type, msg->ifi_index, msg->ifi_flags);
  98
  99         g_static_mutex_lock(&ethernet_mutex);
 100
 101         for (list = ethernet_list; list; list = list->next) {
 102                 struct connman_element *element = list->data;
 103
 104                 if (element->type != CONNMAN_ELEMENT_TYPE_DEVICE)
 105                         continue;
 106
 107                 if (element->netdev.index != msg->ifi_index)
 108                         continue;
 109
 110                 if ((element->netdev.flags & IFF_RUNNING) ==
 111                                                 (msg->ifi_flags & IFF_RUNNING))
 112                         continue;
 113
 114                 element->netdev.flags = msg->ifi_flags;
 115
 116                 if (msg->ifi_flags & IFF_RUNNING) {
 117                         DBG("carrier on");
 118
 119                         create_element(element, CONNMAN_ELEMENT_TYPE_DHCP);
 120                         create_element(element, CONNMAN_ELEMENT_TYPE_ZEROCONF);
 121                 } else {
 122                         DBG("carrier off");
 123
 124                         remove_elements(element);
 125                 }
 126         }
 127
 128         g_static_mutex_unlock(&ethernet_mutex);
 129 }
 130
 131 static gboolean rtnl_event(GIOChannel *chan, GIOCondition cond, gpointer data)
 132 {
 133         unsigned char buf[1024];
 134         void *ptr = buf;
 135         gsize len;
 136         GIOError err;
 137
 138         if (cond & (G_IO_NVAL | G_IO_HUP | G_IO_ERR))
 139                 return FALSE;
 140
 141         memset(buf, 0, sizeof(buf));
 142
 143         err = g_io_channel_read(chan, (gchar *) buf, sizeof(buf), &len);
 144         if (err) {
 145                 if (err == G_IO_ERROR_AGAIN)
 146                         return TRUE;
 147                 return FALSE;
 148         }
 149
 150         DBG("buf %p len %zd", buf, len);
 151
 152         while (len > 0) {
 153                 struct nlmsghdr *hdr = ptr;
 154                 struct nlmsgerr *err;
 155
 156                 if (!NLMSG_OK(hdr, len))
 157                         break;
 158
 159                 DBG("len %d type %d flags 0x%04x seq %d",
 160                                         hdr->nlmsg_len, hdr->nlmsg_type,
 161                                         hdr->nlmsg_flags, hdr->nlmsg_seq);
 162
 163                 switch (hdr->nlmsg_type) {
 164                 case NLMSG_ERROR:
 165                         err = NLMSG_DATA(hdr);
 166                         DBG("ERROR %d (%s)", -err->error,
 167                                                 strerror(-err->error));
 168                         break;
 169
 170                 case RTM_NEWLINK:
 171                         rtnl_link(hdr, "NEWLINK");
 172                         break;
 173
 174                 case RTM_DELLINK:
 175                         rtnl_link(hdr, "DELLINK");
 176                         break;
 177                 }
 178
 179                 len -= hdr->nlmsg_len;
 180                 ptr += hdr->nlmsg_len;
 181         }
 182
 183         return TRUE;
 184 }
 185
 186 static GIOChannel *channel = NULL;
 187
 188 static int rtnl_request(void)
 189 {
 190         struct {
 191                 struct nlmsghdr hdr;
 192                 struct rtgenmsg msg;
 193         } req;
 194
 195         struct sockaddr_nl addr;
 196         int sk;
 197
 198         DBG("");
 199
 200         memset(&req, 0, sizeof(req));
 201         req.hdr.nlmsg_len = sizeof(req.hdr) + sizeof(req.msg);
 202         req.hdr.nlmsg_type = RTM_GETLINK;
 203         req.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
 204         req.hdr.nlmsg_pid = 0;
 205         req.hdr.nlmsg_seq = 42;
 206         req.msg.rtgen_family = AF_INET;
 207
 208         sk = g_io_channel_unix_get_fd(channel);
 209
 210         memset(&addr, 0, sizeof(addr));
 211         addr.nl_family = AF_NETLINK;
 212
 213         return sendto(sk, &req, sizeof(req), 0,
 214                         (struct sockaddr *) &addr, sizeof(addr));
 215 }
 216
 217 static int ethernet_probe(struct connman_element *element)
 218 {
 219         DBG("element %p name %s", element, element->name);
 220
 221         g_static_mutex_lock(&ethernet_mutex);
 222         ethernet_list = g_slist_append(ethernet_list, element);
 223         g_static_mutex_unlock(&ethernet_mutex);
 224
 225         rtnl_request();
 226
 227         return 0;
 228 }
 229
 230 static void ethernet_remove(struct connman_element *element)
 231 {
 232         DBG("element %p name %s", element, element->name);
 233
 234         g_static_mutex_lock(&ethernet_mutex);
 235         ethernet_list = g_slist_remove(ethernet_list, element);
 236         g_static_mutex_unlock(&ethernet_mutex);
 237 }
 238
 239 static struct connman_driver ethernet_driver = {
 240         .name           = "ethernet",
 241         .type           = CONNMAN_ELEMENT_TYPE_DEVICE,
 242         .subtype        = CONNMAN_ELEMENT_SUBTYPE_ETHERNET,
 243         .probe          = ethernet_probe,
 244         .remove         = ethernet_remove,
 245 };
 246
 247 static int rtnl_init(void)
 248 {
 249         struct sockaddr_nl addr;
 250         int sk, err;
 251
 252         DBG("");
 253
 254         sk = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
 255         if (sk < 0)
 256                 return -errno;
 257
 258         memset(&addr, 0, sizeof(addr));
 259         addr.nl_family = AF_NETLINK;
 260         addr.nl_groups = RTMGRP_LINK;
 261
 262         if (bind(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 263                 err = -errno;
 264                 close(sk);
 265                 return err;
 266         }
 267
 268         channel = g_io_channel_unix_new(sk);
 269         g_io_channel_set_close_on_unref(channel, TRUE);
 270
 271         g_io_add_watch(channel, G_IO_IN | G_IO_NVAL | G_IO_HUP | G_IO_ERR,
 272                                                         rtnl_event, NULL);
 273
 274         return 0;
 275 }
 276
 277 static void rtnl_cleanup(void)
 278 {
 279         DBG("");
 280
 281         g_io_channel_shutdown(channel, TRUE, NULL);
 282         g_io_channel_unref(channel);
 283
 284         channel = NULL;
 285 }
 286
 287 static int ethernet_init(void)
 288 {
 289         int err;
 290
 291         err = rtnl_init();
 292         if (err < 0)
 293                 return err;
 294
 295         err = connman_driver_register(&ethernet_driver);
 296         if (err < 0) {
 297                 rtnl_cleanup();
 298                 return err;
 299         }
 300
 301         return 0;
 302 }
 303
 304 static void ethernet_exit(void)
 305 {
 306         connman_driver_unregister(&ethernet_driver);
 307
 308         rtnl_cleanup();
 309 }
 310
 311 CONNMAN_PLUGIN_DEFINE("ethernet", "Ethernet interface plugin", VERSION,
 312                                                 ethernet_init, ethernet_exit)