src/rtnl.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007  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 <stdio.h>
  27 #include <unistd.h>
  28 #include <string.h>
  29 #include <sys/socket.h>
  30 #include <arpa/inet.h>
  31
  32 #include <linux/if.h>
  33 #include <linux/netlink.h>
  34 #include <linux/rtnetlink.h>
  35
  36 #include <glib.h>
  37
  38 #include "connman.h"
  39
  40 static inline void print_char(struct rtattr *attr, const char *name)
  41 {
  42         printf("  attr %s (len %d) %s\n", name, RTA_PAYLOAD(attr),
  43                                                 (char *) RTA_DATA(attr));
  44 }
  45
  46 static inline void print_attr(struct rtattr *attr, const char *name)
  47 {
  48         if (name)
  49                 printf("  attr %s (len %d)\n", name, RTA_PAYLOAD(attr));
  50         else
  51                 printf("  attr %d (len %d)\n",
  52                                         attr->rta_type, RTA_PAYLOAD(attr));
  53 }
  54
  55 static void rtnl_link(struct nlmsghdr *hdr)
  56 {
  57         struct connman_iface *iface;
  58         struct ifinfomsg *msg;
  59         struct rtattr *attr;
  60         int bytes;
  61
  62         msg = (struct ifinfomsg *) NLMSG_DATA(hdr);
  63         bytes = IFLA_PAYLOAD(hdr);
  64
  65         DBG("ifi_index %d ifi_flags 0x%04x", msg->ifi_index, msg->ifi_flags);
  66
  67         iface = __connman_iface_find(msg->ifi_index);
  68         if (iface == NULL)
  69                 return;
  70
  71         if ((iface->flags & CONNMAN_IFACE_FLAG_RTNL) == 0)
  72                 return;
  73
  74         if (iface->carrier != (msg->ifi_flags & IFF_RUNNING)) {
  75                 iface->carrier = (msg->ifi_flags & IFF_RUNNING);
  76                 DBG("carrier %s", iface->carrier ? "on" : "off");
  77         }
  78
  79         for (attr = IFLA_RTA(msg); RTA_OK(attr, bytes);
  80                                         attr = RTA_NEXT(attr, bytes)) {
  81                 switch (attr->rta_type) {
  82                 case IFLA_ADDRESS:
  83                         print_attr(attr, "address");
  84                         break;
  85                 case IFLA_BROADCAST:
  86                         print_attr(attr, "broadcast");
  87                         break;
  88                 case IFLA_IFNAME:
  89                         print_char(attr, "ifname");
  90                         break;
  91                 case IFLA_MTU:
  92                         print_attr(attr, "mtu");
  93                         break;
  94                 case IFLA_LINK:
  95                         print_attr(attr, "link");
  96                         break;
  97                 case IFLA_QDISC:
  98                         print_attr(attr, "qdisc");
  99                         break;
 100                 case IFLA_STATS:
 101                         print_attr(attr, "stats");
 102                         break;
 103                 case IFLA_COST:
 104                         print_attr(attr, "cost");
 105                         break;
 106                 case IFLA_PRIORITY:
 107                         print_attr(attr, "priority");
 108                         break;
 109                 case IFLA_MASTER:
 110                         print_attr(attr, "master");
 111                         break;
 112                 case IFLA_WIRELESS:
 113                         if (iface->driver->rtnl_wireless)
 114                                 iface->driver->rtnl_wireless(iface,
 115                                         RTA_DATA(attr), RTA_PAYLOAD(attr));
 116                         break;
 117                 case IFLA_PROTINFO:
 118                         print_attr(attr, "protinfo");
 119                         break;
 120                 case IFLA_TXQLEN:
 121                         print_attr(attr, "txqlen");
 122                         break;
 123                 case IFLA_MAP:
 124                         print_attr(attr, "map");
 125                         break;
 126                 case IFLA_WEIGHT:
 127                         print_attr(attr, "weight");
 128                         break;
 129                 case IFLA_OPERSTATE:
 130                         print_attr(attr, "operstate");
 131                         break;
 132                 case IFLA_LINKMODE:
 133                         print_attr(attr, "linkmode");
 134                         break;
 135                 default:
 136                         print_attr(attr, NULL);
 137                         break;
 138                 }
 139         }
 140 }
 141
 142 static void rtnl_addr(struct nlmsghdr *hdr)
 143 {
 144         struct connman_iface *iface;
 145         struct ifaddrmsg *msg;
 146         struct rtattr *attr;
 147         int bytes;
 148
 149         msg = (struct ifaddrmsg *) NLMSG_DATA(hdr);
 150         bytes = IFA_PAYLOAD(hdr);
 151
 152         DBG("ifa_family %d ifa_index %d", msg->ifa_family, msg->ifa_index);
 153
 154         iface = __connman_iface_find(msg->ifa_index);
 155         if (iface == NULL)
 156                 return;
 157
 158         if ((iface->flags & CONNMAN_IFACE_FLAG_RTNL) == 0)
 159                 return;
 160
 161         for (attr = IFA_RTA(msg); RTA_OK(attr, bytes);
 162                                         attr = RTA_NEXT(attr, bytes)) {
 163                 switch (attr->rta_type) {
 164                 case IFA_ADDRESS:
 165                         print_attr(attr, "address");
 166                         if (msg->ifa_family == AF_INET) {
 167                                 struct in_addr addr;
 168                                 addr = *((struct in_addr *) RTA_DATA(attr));
 169                                 DBG("    address %s", inet_ntoa(addr));
 170                         }
 171                         break;
 172                 case IFA_LOCAL:
 173                         print_attr(attr, "local");
 174                         if (msg->ifa_family == AF_INET) {
 175                                 struct in_addr addr;
 176                                 addr = *((struct in_addr *) RTA_DATA(attr));
 177                                 DBG("    address %s", inet_ntoa(addr));
 178                         }
 179                         break;
 180                 case IFA_LABEL:
 181                         print_char(attr, "label");
 182                         break;
 183                 case IFA_BROADCAST:
 184                         print_attr(attr, "broadcast");
 185                         if (msg->ifa_family == AF_INET) {
 186                                 struct in_addr addr;
 187                                 addr = *((struct in_addr *) RTA_DATA(attr));
 188                                 DBG("    address %s", inet_ntoa(addr));
 189                         }
 190                         break;
 191                 case IFA_ANYCAST:
 192                         print_attr(attr, "anycast");
 193                         break;
 194                 case IFA_CACHEINFO:
 195                         print_attr(attr, "cacheinfo");
 196                         break;
 197                 case IFA_MULTICAST:
 198                         print_attr(attr, "multicast");
 199                         break;
 200                 default:
 201                         print_attr(attr, NULL);
 202                         break;
 203                 }
 204         }
 205 }
 206
 207 static void rtnl_route(struct nlmsghdr *hdr)
 208 {
 209         struct rtmsg *msg;
 210         struct rtattr *attr;
 211         int bytes;
 212
 213         msg = (struct rtmsg *) NLMSG_DATA(hdr);
 214         bytes = RTM_PAYLOAD(hdr);
 215
 216         DBG("rtm_family %d rtm_flags 0x%04x", msg->rtm_family, msg->rtm_flags);
 217
 218         for (attr = RTM_RTA(msg); RTA_OK(attr, bytes);
 219                                         attr = RTA_NEXT(attr, bytes)) {
 220                 switch (attr->rta_type) {
 221                 case RTA_DST:
 222                         print_attr(attr, "dst");
 223                         if (msg->rtm_family == AF_INET) {
 224                                 struct in_addr addr;
 225                                 addr = *((struct in_addr *) RTA_DATA(attr));
 226                                 DBG("    address %s", inet_ntoa(addr));
 227                         }
 228                         break;
 229                 case RTA_SRC:
 230                         print_attr(attr, "src");
 231                         if (msg->rtm_family == AF_INET) {
 232                                 struct in_addr addr;
 233                                 addr = *((struct in_addr *) RTA_DATA(attr));
 234                                 DBG("    address %s", inet_ntoa(addr));
 235                         }
 236                         break;
 237                 case RTA_IIF:
 238                         print_char(attr, "iif");
 239                         break;
 240                 case RTA_OIF:
 241                         print_attr(attr, "oif");
 242                         break;
 243                 case RTA_GATEWAY:
 244                         print_attr(attr, "gateway");
 245                         if (msg->rtm_family == AF_INET) {
 246                                 struct in_addr addr;
 247                                 addr = *((struct in_addr *) RTA_DATA(attr));
 248                                 DBG("    address %s", inet_ntoa(addr));
 249                         }
 250                         break;
 251                 case RTA_PRIORITY:
 252                         print_attr(attr, "priority");
 253                         break;
 254                 case RTA_PREFSRC:
 255                         print_attr(attr, "prefsrc");
 256                         if (msg->rtm_family == AF_INET) {
 257                                 struct in_addr addr;
 258                                 addr = *((struct in_addr *) RTA_DATA(attr));
 259                                 DBG("    address %s", inet_ntoa(addr));
 260                         }
 261                         break;
 262                 case RTA_METRICS:
 263                         print_attr(attr, "metrics");
 264                         break;
 265                 case RTA_TABLE:
 266                         print_attr(attr, "table");
 267                         break;
 268                 default:
 269                         print_attr(attr, NULL);
 270                         break;
 271                 }
 272         }
 273 }
 274
 275 static void rtnl_message(unsigned char *buf, size_t size)
 276 {
 277         struct nlmsghdr *hdr = (void *) buf;
 278
 279         if (!NLMSG_OK(hdr, size))
 280                 return;
 281
 282         switch (hdr->nlmsg_type) {
 283         case NLMSG_DONE:
 284                 DBG("done");
 285                 return;
 286         case NLMSG_NOOP:
 287                 DBG("noop");
 288                 return;
 289         case NLMSG_OVERRUN:
 290                 DBG("overrun");
 291                 return;
 292         case NLMSG_ERROR:
 293                 DBG("error");
 294                 return;
 295         case RTM_NEWLINK:
 296                 rtnl_link(hdr);
 297                 break;
 298         case RTM_DELLINK:
 299                 rtnl_link(hdr);
 300                 break;
 301         case RTM_NEWADDR:
 302                 rtnl_addr(hdr);
 303                 break;
 304         case RTM_DELADDR:
 305                 rtnl_addr(hdr);
 306                 break;
 307         case RTM_NEWROUTE:
 308                 rtnl_route(hdr);
 309                 break;
 310         case RTM_DELROUTE:
 311                 rtnl_route(hdr);
 312                 break;
 313         default:
 314                 DBG("type %d", hdr->nlmsg_type);
 315                 break;
 316         }
 317 }
 318
 319 static gboolean netlink_event(GIOChannel *chan,
 320                                 GIOCondition cond, gpointer data)
 321 {
 322         unsigned char buf[256];
 323         gsize len;
 324         GIOError err;
 325
 326         if (cond & (G_IO_NVAL | G_IO_HUP | G_IO_ERR)) {
 327                 g_io_channel_unref(chan);
 328                 return FALSE;
 329         }
 330
 331         memset(buf, 0, sizeof(buf));
 332
 333         err = g_io_channel_read(chan, (gchar *) buf, sizeof(buf), &len);
 334         if (err) {
 335                 if (err == G_IO_ERROR_AGAIN)
 336                         return TRUE;
 337                 g_io_channel_unref(chan);
 338                 return FALSE;
 339         }
 340
 341         rtnl_message(buf, len);
 342
 343         return TRUE;
 344 }
 345
 346 static GIOChannel *channel = NULL;
 347
 348 int __connman_rtnl_init(void)
 349 {
 350         struct sockaddr_nl addr;
 351         int sk;
 352
 353         DBG("");
 354
 355         sk = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
 356         if (sk < 0)
 357                 return -1;
 358
 359         memset(&addr, 0, sizeof(addr));
 360         addr.nl_family = AF_NETLINK;
 361         addr.nl_groups = RTMGRP_LINK;
 362         //addr.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE;
 363         addr.nl_pid = getpid();
 364
 365         if (bind(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 366                 close(sk);
 367                 return -1;
 368         }
 369
 370         channel = g_io_channel_unix_new(sk);
 371         g_io_channel_set_close_on_unref(channel, TRUE);
 372
 373         g_io_add_watch(channel,
 374                         G_IO_IN | G_IO_NVAL | G_IO_HUP | G_IO_ERR,
 375                                                 netlink_event, NULL);
 376
 377         g_io_channel_unref(channel);
 378
 379         return 0;
 380 }
 381
 382 void __connman_rtnl_cleanup(void)
 383 {
 384         DBG("");
 385
 386         g_io_channel_unref(channel);
 387
 388         channel = NULL;
 389 }