vcs.maemo.org Git - connman/blob - src/rtnl.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 <arpa/inet.h>
  30
  31 #include <linux/if.h>
  32 #include <linux/netlink.h>
  33 #include <linux/rtnetlink.h>
  34
  35 #include <glib.h>
  36
  37 #include "connman.h"
  38
  39 static inline void print_inet(struct rtattr *attr, const char *name, int family)
  40 {
  41         if (family == AF_INET) {
  42                 struct in_addr addr;
  43                 addr = *((struct in_addr *) RTA_DATA(attr));
  44                 DBG("  attr %s (len %jd) %s\n",
  45                                 name, RTA_PAYLOAD(attr), inet_ntoa(addr));
  46         } else
  47                 DBG("  attr %s (len %jd)\n", name, RTA_PAYLOAD(attr));
  48 }
  49
  50 static inline void print_char(struct rtattr *attr, const char *name)
  51 {
  52         DBG("  attr %s (len %jd) %s\n", name, RTA_PAYLOAD(attr),
  53                                                 (char *) RTA_DATA(attr));
  54 }
  55
  56 static inline void print_byte(struct rtattr *attr, const char *name)
  57 {
  58         DBG("  attr %s (len %jd) 0x%02x\n", name, RTA_PAYLOAD(attr),
  59                                         *((unsigned char *) RTA_DATA(attr)));
  60 }
  61
  62 static inline void print_attr(struct rtattr *attr, const char *name)
  63 {
  64         if (name)
  65                 DBG("  attr %s (len %jd)\n", name, RTA_PAYLOAD(attr));
  66         else
  67                 DBG("  attr %d (len %jd)\n",
  68                                         attr->rta_type, RTA_PAYLOAD(attr));
  69 }
  70
  71 static void rtnl_link(struct nlmsghdr *hdr)
  72 {
  73         struct ifinfomsg *msg;
  74         struct rtattr *attr;
  75         int bytes;
  76
  77         msg = (struct ifinfomsg *) NLMSG_DATA(hdr);
  78         bytes = IFLA_PAYLOAD(hdr);
  79
  80         DBG("ifi_index %d ifi_flags 0x%04x", msg->ifi_index, msg->ifi_flags);
  81
  82         for (attr = IFLA_RTA(msg); RTA_OK(attr, bytes);
  83                                         attr = RTA_NEXT(attr, bytes)) {
  84                 switch (attr->rta_type) {
  85                 case IFLA_ADDRESS:
  86                         print_attr(attr, "address");
  87                         break;
  88                 case IFLA_BROADCAST:
  89                         print_attr(attr, "broadcast");
  90                         break;
  91                 case IFLA_IFNAME:
  92                         print_char(attr, "ifname");
  93                         break;
  94                 case IFLA_MTU:
  95                         print_attr(attr, "mtu");
  96                         break;
  97                 case IFLA_LINK:
  98                         print_attr(attr, "link");
  99                         break;
 100                 case IFLA_QDISC:
 101                         print_attr(attr, "qdisc");
 102                         break;
 103                 case IFLA_STATS:
 104                         print_attr(attr, "stats");
 105                         break;
 106                 case IFLA_COST:
 107                         print_attr(attr, "cost");
 108                         break;
 109                 case IFLA_PRIORITY:
 110                         print_attr(attr, "priority");
 111                         break;
 112                 case IFLA_MASTER:
 113                         print_attr(attr, "master");
 114                         break;
 115                 case IFLA_WIRELESS:
 116                         print_attr(attr, "wireless");
 117                         break;
 118                 case IFLA_PROTINFO:
 119                         print_attr(attr, "protinfo");
 120                         break;
 121                 case IFLA_TXQLEN:
 122                         print_attr(attr, "txqlen");
 123                         break;
 124                 case IFLA_MAP:
 125                         print_attr(attr, "map");
 126                         break;
 127                 case IFLA_WEIGHT:
 128                         print_attr(attr, "weight");
 129                         break;
 130                 case IFLA_OPERSTATE:
 131                         print_byte(attr, "operstate");
 132                         break;
 133                 case IFLA_LINKMODE:
 134                         print_byte(attr, "linkmode");
 135                         break;
 136                 default:
 137                         print_attr(attr, NULL);
 138                         break;
 139                 }
 140         }
 141 }
 142
 143 static void rtnl_addr(struct nlmsghdr *hdr)
 144 {
 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         for (attr = IFA_RTA(msg); RTA_OK(attr, bytes);
 155                                         attr = RTA_NEXT(attr, bytes)) {
 156                 switch (attr->rta_type) {
 157                 case IFA_ADDRESS:
 158                         print_inet(attr, "address", msg->ifa_family);
 159                         break;
 160                 case IFA_LOCAL:
 161                         print_inet(attr, "local", msg->ifa_family);
 162                         break;
 163                 case IFA_LABEL:
 164                         print_char(attr, "label");
 165                         break;
 166                 case IFA_BROADCAST:
 167                         print_inet(attr, "broadcast", msg->ifa_family);
 168                         break;
 169                 case IFA_ANYCAST:
 170                         print_attr(attr, "anycast");
 171                         break;
 172                 case IFA_CACHEINFO:
 173                         print_attr(attr, "cacheinfo");
 174                         break;
 175                 case IFA_MULTICAST:
 176                         print_attr(attr, "multicast");
 177                         break;
 178                 default:
 179                         print_attr(attr, NULL);
 180                         break;
 181                 }
 182         }
 183 }
 184
 185 static void rtnl_route(struct nlmsghdr *hdr)
 186 {
 187         struct rtmsg *msg;
 188         struct rtattr *attr;
 189         int bytes;
 190
 191         msg = (struct rtmsg *) NLMSG_DATA(hdr);
 192         bytes = RTM_PAYLOAD(hdr);
 193
 194         DBG("rtm_family %d rtm_flags 0x%04x", msg->rtm_family, msg->rtm_flags);
 195
 196         for (attr = RTM_RTA(msg); RTA_OK(attr, bytes);
 197                                         attr = RTA_NEXT(attr, bytes)) {
 198                 switch (attr->rta_type) {
 199                 case RTA_DST:
 200                         print_inet(attr, "dst", msg->rtm_family);
 201                         break;
 202                 case RTA_SRC:
 203                         print_inet(attr, "src", msg->rtm_family);
 204                         break;
 205                 case RTA_IIF:
 206                         print_char(attr, "iif");
 207                         break;
 208                 case RTA_OIF:
 209                         print_attr(attr, "oif");
 210                         break;
 211                 case RTA_GATEWAY:
 212                         print_inet(attr, "gateway", msg->rtm_family);
 213                         break;
 214                 case RTA_PRIORITY:
 215                         print_attr(attr, "priority");
 216                         break;
 217                 case RTA_PREFSRC:
 218                         print_inet(attr, "prefsrc", msg->rtm_family);
 219                         break;
 220                 case RTA_METRICS:
 221                         print_attr(attr, "metrics");
 222                         break;
 223                 case RTA_TABLE:
 224                         print_attr(attr, "table");
 225                         break;
 226                 default:
 227                         print_attr(attr, NULL);
 228                         break;
 229                 }
 230         }
 231 }
 232
 233 static void rtnl_message(void *buf, size_t len)
 234 {
 235         DBG("buf %p len %zd", buf, len);
 236
 237         while (len > 0) {
 238                 struct nlmsghdr *hdr = buf;
 239                 struct nlmsgerr *err;
 240
 241                 if (!NLMSG_OK(hdr, len))
 242                         break;
 243
 244                 DBG("len %d type %d flags 0x%04x seq %d",
 245                                         hdr->nlmsg_len, hdr->nlmsg_type,
 246                                         hdr->nlmsg_flags, hdr->nlmsg_seq);
 247
 248                 switch (hdr->nlmsg_type) {
 249                 case NLMSG_NOOP:
 250                         DBG("NOOP");
 251                         return;
 252                 case NLMSG_ERROR:
 253                         err = NLMSG_DATA(hdr);
 254                         DBG("ERROR %d (%s)", -err->error,
 255                                                 strerror(-err->error));
 256                         return;
 257                 case NLMSG_DONE:
 258                         DBG("DONE");
 259                         return;
 260                 case NLMSG_OVERRUN:
 261                         DBG("OVERRUN");
 262                         return;
 263                 case RTM_NEWLINK:
 264                         DBG("NEWLINK");
 265                         rtnl_link(hdr);
 266                         break;
 267                 case RTM_DELLINK:
 268                         DBG("DELLINK");
 269                         rtnl_link(hdr);
 270                         break;
 271                 case RTM_NEWADDR:
 272                         DBG("NEWADDR");
 273                         rtnl_addr(hdr);
 274                         break;
 275                 case RTM_DELADDR:
 276                         DBG("DELADDR");
 277                         rtnl_addr(hdr);
 278                         break;
 279                 case RTM_NEWROUTE:
 280                         DBG("NEWROUTE");
 281                         rtnl_route(hdr);
 282                         break;
 283                 case RTM_DELROUTE:
 284                         DBG("DELROUTE");
 285                         rtnl_route(hdr);
 286                         break;
 287                 default:
 288                         DBG("type %d", hdr->nlmsg_type);
 289                         break;
 290                 }
 291
 292                 len -= hdr->nlmsg_len;
 293                 buf += hdr->nlmsg_len;
 294         }
 295 }
 296
 297 static gboolean netlink_event(GIOChannel *chan,
 298                                 GIOCondition cond, gpointer data)
 299 {
 300         unsigned char buf[256];
 301         gsize len;
 302         GIOError err;
 303
 304         if (cond & (G_IO_NVAL | G_IO_HUP | G_IO_ERR))
 305                 return FALSE;
 306
 307         memset(buf, 0, sizeof(buf));
 308
 309         err = g_io_channel_read(chan, (gchar *) buf, sizeof(buf), &len);
 310         if (err) {
 311                 if (err == G_IO_ERROR_AGAIN)
 312                         return TRUE;
 313                 return FALSE;
 314         }
 315
 316         rtnl_message(buf, len);
 317
 318         return TRUE;
 319 }
 320
 321 static GIOChannel *channel = NULL;
 322
 323 int __connman_rtnl_send(const void *buf, size_t len)
 324 {
 325         struct sockaddr_nl addr;
 326         int sk;
 327
 328         DBG("buf %p len %zd", buf, len);
 329
 330         sk = g_io_channel_unix_get_fd(channel);
 331
 332         memset(&addr, 0, sizeof(addr));
 333         addr.nl_family = AF_NETLINK;
 334
 335         return sendto(sk, buf, len, 0,
 336                         (struct sockaddr *) &addr, sizeof(addr));
 337 }
 338
 339 int __connman_rtnl_init(void)
 340 {
 341         struct sockaddr_nl addr;
 342         int sk;
 343
 344         DBG("");
 345
 346         sk = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
 347         if (sk < 0)
 348                 return -1;
 349
 350         memset(&addr, 0, sizeof(addr));
 351         addr.nl_family = AF_NETLINK;
 352         //addr.nl_groups = RTMGRP_LINK;
 353         //addr.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR;
 354         //addr.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE;
 355
 356         if (bind(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 357                 close(sk);
 358                 return -1;
 359         }
 360
 361         channel = g_io_channel_unix_new(sk);
 362         g_io_channel_set_close_on_unref(channel, TRUE);
 363
 364         g_io_add_watch(channel, G_IO_IN | G_IO_NVAL | G_IO_HUP | G_IO_ERR,
 365                                                         netlink_event, NULL);
 366
 367         return 0;
 368 }
 369
 370 void __connman_rtnl_cleanup(void)
 371 {
 372         DBG("");
 373
 374         g_io_channel_shutdown(channel, TRUE, NULL);
 375         g_io_channel_unref(channel);
 376
 377         channel = NULL;
 378 }