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_inet(struct rtattr *attr, const char *name, int family)
  41 {
  42         if (family == AF_INET) {
  43                 struct in_addr addr;
  44                 addr = *((struct in_addr *) RTA_DATA(attr));
  45                 printf("  attr %s (len %d) %s\n",
  46                                 name, RTA_PAYLOAD(attr), inet_ntoa(addr));
  47         } else
  48                 printf("  attr %s (len %d)\n", name, RTA_PAYLOAD(attr));
  49 }
  50
  51 static inline void print_char(struct rtattr *attr, const char *name)
  52 {
  53         printf("  attr %s (len %d) %s\n", name, RTA_PAYLOAD(attr),
  54                                                 (char *) RTA_DATA(attr));
  55 }
  56
  57 static inline void print_byte(struct rtattr *attr, const char *name)
  58 {
  59         printf("  attr %s (len %d) 0x%02x\n", name, RTA_PAYLOAD(attr),
  60                                         *((unsigned char *) RTA_DATA(attr)));
  61 }
  62
  63 static inline void print_attr(struct rtattr *attr, const char *name)
  64 {
  65         if (name)
  66                 printf("  attr %s (len %d)\n", name, RTA_PAYLOAD(attr));
  67         else
  68                 printf("  attr %d (len %d)\n",
  69                                         attr->rta_type, RTA_PAYLOAD(attr));
  70 }
  71
  72 static void rtnl_link(struct nlmsghdr *hdr)
  73 {
  74         struct connman_iface *iface;
  75         struct ifinfomsg *msg;
  76         struct rtattr *attr;
  77         int bytes;
  78
  79         msg = (struct ifinfomsg *) NLMSG_DATA(hdr);
  80         bytes = IFLA_PAYLOAD(hdr);
  81
  82         DBG("ifi_index %d ifi_flags 0x%04x", msg->ifi_index, msg->ifi_flags);
  83
  84         iface = __connman_iface_find(msg->ifi_index);
  85         if (iface == NULL)
  86                 return;
  87
  88         if ((iface->flags & CONNMAN_IFACE_FLAG_RTNL) == 0)
  89                 return;
  90
  91         if (iface->carrier != ((msg->ifi_flags & IFF_RUNNING) != 0)) {
  92                 iface->carrier = ((msg->ifi_flags & IFF_RUNNING) != 0);
  93                 if (iface->driver->rtnl_carrier)
  94                         iface->driver->rtnl_carrier(iface, iface->carrier);
  95                 else
  96                         connman_iface_indicate_carrier(iface, iface->carrier);
  97         }
  98
  99         for (attr = IFLA_RTA(msg); RTA_OK(attr, bytes);
 100                                         attr = RTA_NEXT(attr, bytes)) {
 101                 switch (attr->rta_type) {
 102                 case IFLA_ADDRESS:
 103                         print_attr(attr, "address");
 104                         break;
 105                 case IFLA_BROADCAST:
 106                         print_attr(attr, "broadcast");
 107                         break;
 108                 case IFLA_IFNAME:
 109                         print_char(attr, "ifname");
 110                         break;
 111                 case IFLA_MTU:
 112                         print_attr(attr, "mtu");
 113                         break;
 114                 case IFLA_LINK:
 115                         print_attr(attr, "link");
 116                         break;
 117                 case IFLA_QDISC:
 118                         print_attr(attr, "qdisc");
 119                         break;
 120                 case IFLA_STATS:
 121                         print_attr(attr, "stats");
 122                         break;
 123                 case IFLA_COST:
 124                         print_attr(attr, "cost");
 125                         break;
 126                 case IFLA_PRIORITY:
 127                         print_attr(attr, "priority");
 128                         break;
 129                 case IFLA_MASTER:
 130                         print_attr(attr, "master");
 131                         break;
 132                 case IFLA_WIRELESS:
 133                         if (iface->driver->rtnl_wireless)
 134                                 iface->driver->rtnl_wireless(iface,
 135                                         RTA_DATA(attr), RTA_PAYLOAD(attr));
 136                         break;
 137                 case IFLA_PROTINFO:
 138                         print_attr(attr, "protinfo");
 139                         break;
 140                 case IFLA_TXQLEN:
 141                         print_attr(attr, "txqlen");
 142                         break;
 143                 case IFLA_MAP:
 144                         print_attr(attr, "map");
 145                         break;
 146                 case IFLA_WEIGHT:
 147                         print_attr(attr, "weight");
 148                         break;
 149                 case IFLA_OPERSTATE:
 150                         print_byte(attr, "operstate");
 151                         break;
 152                 case IFLA_LINKMODE:
 153                         print_byte(attr, "linkmode");
 154                         break;
 155                 default:
 156                         print_attr(attr, NULL);
 157                         break;
 158                 }
 159         }
 160 }
 161
 162 static void rtnl_addr(struct nlmsghdr *hdr)
 163 {
 164         struct connman_iface *iface;
 165         struct ifaddrmsg *msg;
 166         struct rtattr *attr;
 167         int bytes;
 168
 169         msg = (struct ifaddrmsg *) NLMSG_DATA(hdr);
 170         bytes = IFA_PAYLOAD(hdr);
 171
 172         DBG("ifa_family %d ifa_index %d", msg->ifa_family, msg->ifa_index);
 173
 174         iface = __connman_iface_find(msg->ifa_index);
 175         if (iface == NULL)
 176                 return;
 177
 178         if ((iface->flags & CONNMAN_IFACE_FLAG_RTNL) == 0)
 179                 return;
 180
 181         for (attr = IFA_RTA(msg); RTA_OK(attr, bytes);
 182                                         attr = RTA_NEXT(attr, bytes)) {
 183                 switch (attr->rta_type) {
 184                 case IFA_ADDRESS:
 185                         print_inet(attr, "address", msg->ifa_family);
 186                         break;
 187                 case IFA_LOCAL:
 188                         print_inet(attr, "local", msg->ifa_family);
 189                         break;
 190                 case IFA_LABEL:
 191                         print_char(attr, "label");
 192                         break;
 193                 case IFA_BROADCAST:
 194                         print_inet(attr, "broadcast", msg->ifa_family);
 195                         break;
 196                 case IFA_ANYCAST:
 197                         print_attr(attr, "anycast");
 198                         break;
 199                 case IFA_CACHEINFO:
 200                         print_attr(attr, "cacheinfo");
 201                         break;
 202                 case IFA_MULTICAST:
 203                         print_attr(attr, "multicast");
 204                         break;
 205                 default:
 206                         print_attr(attr, NULL);
 207                         break;
 208                 }
 209         }
 210 }
 211
 212 static void rtnl_route(struct nlmsghdr *hdr)
 213 {
 214         struct rtmsg *msg;
 215         struct rtattr *attr;
 216         int bytes;
 217
 218         msg = (struct rtmsg *) NLMSG_DATA(hdr);
 219         bytes = RTM_PAYLOAD(hdr);
 220
 221         DBG("rtm_family %d rtm_flags 0x%04x", msg->rtm_family, msg->rtm_flags);
 222
 223         for (attr = RTM_RTA(msg); RTA_OK(attr, bytes);
 224                                         attr = RTA_NEXT(attr, bytes)) {
 225                 switch (attr->rta_type) {
 226                 case RTA_DST:
 227                         print_inet(attr, "dst", msg->rtm_family);
 228                         break;
 229                 case RTA_SRC:
 230                         print_inet(attr, "src", msg->rtm_family);
 231                         break;
 232                 case RTA_IIF:
 233                         print_char(attr, "iif");
 234                         break;
 235                 case RTA_OIF:
 236                         print_attr(attr, "oif");
 237                         break;
 238                 case RTA_GATEWAY:
 239                         print_inet(attr, "gateway", msg->rtm_family);
 240                         break;
 241                 case RTA_PRIORITY:
 242                         print_attr(attr, "priority");
 243                         break;
 244                 case RTA_PREFSRC:
 245                         print_inet(attr, "prefsrc", msg->rtm_family);
 246                         break;
 247                 case RTA_METRICS:
 248                         print_attr(attr, "metrics");
 249                         break;
 250                 case RTA_TABLE:
 251                         print_attr(attr, "table");
 252                         break;
 253                 default:
 254                         print_attr(attr, NULL);
 255                         break;
 256                 }
 257         }
 258 }
 259
 260 static void rtnl_message(void *buf, size_t len)
 261 {
 262         DBG("buf %p len %d", buf, len);
 263
 264         while (len > 0) {
 265                 struct nlmsghdr *hdr = buf;
 266
 267                 if (!NLMSG_OK(hdr, len))
 268                         break;
 269
 270                 DBG("len %d type %d flags 0x%04x",
 271                         hdr->nlmsg_len, hdr->nlmsg_type, hdr->nlmsg_flags);
 272
 273                 switch (hdr->nlmsg_type) {
 274                 case NLMSG_DONE:
 275                         DBG("done");
 276                         return;
 277                 case NLMSG_NOOP:
 278                         DBG("noop");
 279                         return;
 280                 case NLMSG_OVERRUN:
 281                         DBG("overrun");
 282                         return;
 283                 case NLMSG_ERROR:
 284                         DBG("error");
 285                         return;
 286                 case RTM_NEWLINK:
 287                         rtnl_link(hdr);
 288                         break;
 289                 case RTM_DELLINK:
 290                         rtnl_link(hdr);
 291                         break;
 292                 case RTM_NEWADDR:
 293                         rtnl_addr(hdr);
 294                         break;
 295                 case RTM_DELADDR:
 296                         rtnl_addr(hdr);
 297                         break;
 298                 case RTM_NEWROUTE:
 299                         rtnl_route(hdr);
 300                         break;
 301                 case RTM_DELROUTE:
 302                         rtnl_route(hdr);
 303                         break;
 304                 default:
 305                         DBG("type %d", hdr->nlmsg_type);
 306                         break;
 307                 }
 308
 309                 len -= hdr->nlmsg_len;
 310                 buf += hdr->nlmsg_len;
 311         }
 312 }
 313
 314 static gboolean netlink_event(GIOChannel *chan,
 315                                 GIOCondition cond, gpointer data)
 316 {
 317         unsigned char buf[256];
 318         gsize len;
 319         GIOError err;
 320
 321         if (cond & (G_IO_NVAL | G_IO_HUP | G_IO_ERR)) {
 322                 g_io_channel_unref(chan);
 323                 return FALSE;
 324         }
 325
 326         memset(buf, 0, sizeof(buf));
 327
 328         err = g_io_channel_read(chan, (gchar *) buf, sizeof(buf), &len);
 329         if (err) {
 330                 if (err == G_IO_ERROR_AGAIN)
 331                         return TRUE;
 332                 g_io_channel_unref(chan);
 333                 return FALSE;
 334         }
 335
 336         rtnl_message(buf, len);
 337
 338         return TRUE;
 339 }
 340
 341 static GIOChannel *channel = NULL;
 342
 343 int __connman_rtnl_send(const void *buf, size_t len)
 344 {
 345         struct sockaddr_nl addr;
 346         int sk;
 347
 348         DBG("buf %p len %d", buf, len);
 349
 350         sk = g_io_channel_unix_get_fd(channel);
 351
 352         memset(&addr, 0, sizeof(addr));
 353         addr.nl_family = AF_NETLINK;
 354
 355         return sendto(sk, buf, len, 0,
 356                         (struct sockaddr *) &addr, sizeof(addr));
 357 }
 358
 359 int __connman_rtnl_init(void)
 360 {
 361         struct sockaddr_nl addr;
 362         int sk;
 363
 364         DBG("");
 365
 366         sk = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
 367         if (sk < 0)
 368                 return -1;
 369
 370         memset(&addr, 0, sizeof(addr));
 371         addr.nl_family = AF_NETLINK;
 372         addr.nl_groups = RTMGRP_LINK;
 373         //addr.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE;
 374         addr.nl_pid = getpid();
 375
 376         if (bind(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 377                 close(sk);
 378                 return -1;
 379         }
 380
 381         channel = g_io_channel_unix_new(sk);
 382         g_io_channel_set_close_on_unref(channel, TRUE);
 383
 384         g_io_add_watch(channel,
 385                         G_IO_IN | G_IO_NVAL | G_IO_HUP | G_IO_ERR,
 386                                                 netlink_event, NULL);
 387
 388         g_io_channel_unref(channel);
 389
 390         return 0;
 391 }
 392
 393 void __connman_rtnl_cleanup(void)
 394 {
 395         DBG("");
 396
 397         g_io_channel_unref(channel);
 398
 399         channel = NULL;
 400 }