station.c

   1 #include <net/if.h>
   2 #include <errno.h>
   3 #include <string.h>
   4
   5 #include <netlink/genl/genl.h>
   6 #include <netlink/genl/family.h>
   7 #include <netlink/genl/ctrl.h>
   8 #include <netlink/msg.h>
   9 #include <netlink/attr.h>
  10
  11 #include "nl80211.h"
  12 #include "iw.h"
  13
  14 SECTION(station);
  15
  16 enum plink_state {
  17         LISTEN,
  18         OPN_SNT,
  19         OPN_RCVD,
  20         CNF_RCVD,
  21         ESTAB,
  22         HOLDING,
  23         BLOCKED
  24 };
  25
  26 enum plink_actions {
  27         PLINK_ACTION_UNDEFINED,
  28         PLINK_ACTION_OPEN,
  29         PLINK_ACTION_BLOCK,
  30 };
  31
  32
  33 static int print_sta_handler(struct nl_msg *msg, void *arg)
  34 {
  35         struct nlattr *tb[NL80211_ATTR_MAX + 1];
  36         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
  37         struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
  38         struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
  39         char mac_addr[20], state_name[10], dev[20];
  40         static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
  41                 [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32 },
  42                 [NL80211_STA_INFO_RX_BYTES] = { .type = NLA_U32 },
  43                 [NL80211_STA_INFO_TX_BYTES] = { .type = NLA_U32 },
  44                 [NL80211_STA_INFO_RX_PACKETS] = { .type = NLA_U32 },
  45                 [NL80211_STA_INFO_TX_PACKETS] = { .type = NLA_U32 },
  46                 [NL80211_STA_INFO_SIGNAL] = { .type = NLA_U8 },
  47                 [NL80211_STA_INFO_TX_BITRATE] = { .type = NLA_NESTED },
  48                 [NL80211_STA_INFO_LLID] = { .type = NLA_U16 },
  49                 [NL80211_STA_INFO_PLID] = { .type = NLA_U16 },
  50                 [NL80211_STA_INFO_PLINK_STATE] = { .type = NLA_U8 },
  51                 [NL80211_STA_INFO_TX_RETRIES] = { .type = NLA_U32 },
  52                 [NL80211_STA_INFO_TX_FAILED] = { .type = NLA_U32 },
  53         };
  54
  55         static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
  56                 [NL80211_RATE_INFO_BITRATE] = { .type = NLA_U16 },
  57                 [NL80211_RATE_INFO_MCS] = { .type = NLA_U8 },
  58                 [NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG },
  59                 [NL80211_RATE_INFO_SHORT_GI] = { .type = NLA_FLAG },
  60         };
  61
  62         nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
  63                   genlmsg_attrlen(gnlh, 0), NULL);
  64
  65         /*
  66          * TODO: validate the interface and mac address!
  67          * Otherwise, there's a race condition as soon as
  68          * the kernel starts sending station notifications.
  69          */
  70
  71         if (!tb[NL80211_ATTR_STA_INFO]) {
  72                 fprintf(stderr, "sta stats missing!\n");
  73                 return NL_SKIP;
  74         }
  75         if (nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
  76                              tb[NL80211_ATTR_STA_INFO],
  77                              stats_policy)) {
  78                 fprintf(stderr, "failed to parse nested attributes!\n");
  79                 return NL_SKIP;
  80         }
  81
  82         mac_addr_n2a(mac_addr, nla_data(tb[NL80211_ATTR_MAC]));
  83         if_indextoname(nla_get_u32(tb[NL80211_ATTR_IFINDEX]), dev);
  84         printf("Station %s (on %s)", mac_addr, dev);
  85
  86         if (sinfo[NL80211_STA_INFO_INACTIVE_TIME])
  87                 printf("\n\tinactive time:\t%u ms",
  88                         nla_get_u32(sinfo[NL80211_STA_INFO_INACTIVE_TIME]));
  89         if (sinfo[NL80211_STA_INFO_RX_BYTES])
  90                 printf("\n\trx bytes:\t%u",
  91                         nla_get_u32(sinfo[NL80211_STA_INFO_RX_BYTES]));
  92         if (sinfo[NL80211_STA_INFO_RX_PACKETS])
  93                 printf("\n\trx packets:\t%u",
  94                         nla_get_u32(sinfo[NL80211_STA_INFO_RX_PACKETS]));
  95         if (sinfo[NL80211_STA_INFO_TX_BYTES])
  96                 printf("\n\ttx bytes:\t%u",
  97                         nla_get_u32(sinfo[NL80211_STA_INFO_TX_BYTES]));
  98         if (sinfo[NL80211_STA_INFO_TX_PACKETS])
  99                 printf("\n\ttx packets:\t%u",
 100                         nla_get_u32(sinfo[NL80211_STA_INFO_TX_PACKETS]));
 101         if (sinfo[NL80211_STA_INFO_TX_RETRIES])
 102                 printf("\n\ttx retries:\t%u",
 103                         nla_get_u32(sinfo[NL80211_STA_INFO_TX_RETRIES]));
 104         if (sinfo[NL80211_STA_INFO_TX_FAILED])
 105                 printf("\n\ttx failed:\t%u",
 106                         nla_get_u32(sinfo[NL80211_STA_INFO_TX_FAILED]));
 107         if (sinfo[NL80211_STA_INFO_SIGNAL])
 108                 printf("\n\tsignal:  \t%d dBm",
 109                         (int8_t)nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]));
 110
 111         if (sinfo[NL80211_STA_INFO_TX_BITRATE]) {
 112                 if (nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
 113                                      sinfo[NL80211_STA_INFO_TX_BITRATE], rate_policy)) {
 114                         fprintf(stderr, "failed to parse nested rate attributes!\n");
 115                 } else {
 116                         printf("\n\ttx bitrate:\t");
 117                         if (rinfo[NL80211_RATE_INFO_BITRATE]) {
 118                                 int rate = nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]);
 119                                 printf("%d.%d MBit/s", rate / 10, rate % 10);
 120                         }
 121
 122                         if (rinfo[NL80211_RATE_INFO_MCS])
 123                                 printf(" MCS %d", nla_get_u8(rinfo[NL80211_RATE_INFO_MCS]));
 124                         if (rinfo[NL80211_RATE_INFO_40_MHZ_WIDTH])
 125                                 printf(" 40Mhz");
 126                         if (rinfo[NL80211_RATE_INFO_SHORT_GI])
 127                                 printf(" short GI");
 128                 }
 129         }
 130
 131         if (sinfo[NL80211_STA_INFO_LLID])
 132                 printf("\n\tmesh llid:\t%d",
 133                         nla_get_u16(sinfo[NL80211_STA_INFO_LLID]));
 134         if (sinfo[NL80211_STA_INFO_PLID])
 135                 printf("\n\tmesh plid:\t%d",
 136                         nla_get_u16(sinfo[NL80211_STA_INFO_PLID]));
 137         if (sinfo[NL80211_STA_INFO_PLINK_STATE]) {
 138                 switch (nla_get_u8(sinfo[NL80211_STA_INFO_PLINK_STATE])) {
 139                 case LISTEN:
 140                         strcpy(state_name, "LISTEN");
 141                         break;
 142                 case OPN_SNT:
 143                         strcpy(state_name, "OPN_SNT");
 144                         break;
 145                 case OPN_RCVD:
 146                         strcpy(state_name, "OPN_RCVD");
 147                         break;
 148                 case CNF_RCVD:
 149                         strcpy(state_name, "CNF_RCVD");
 150                         break;
 151                 case ESTAB:
 152                         strcpy(state_name, "ESTAB");
 153                         break;
 154                 case HOLDING:
 155                         strcpy(state_name, "HOLDING");
 156                         break;
 157                 case BLOCKED:
 158                         strcpy(state_name, "BLOCKED");
 159                         break;
 160                 default:
 161                         strcpy(state_name, "UNKNOWN");
 162                         break;
 163                 }
 164                 printf("\n\tmesh plink:\t%s", state_name);
 165         }
 166
 167         printf("\n");
 168         return NL_SKIP;
 169 }
 170
 171 static int handle_station_get(struct nl80211_state *state,
 172                               struct nl_cb *cb,
 173                               struct nl_msg *msg,
 174                               int argc, char **argv)
 175 {
 176         unsigned char mac_addr[ETH_ALEN];
 177
 178         if (argc < 1)
 179                 return 1;
 180
 181         if (mac_addr_a2n(mac_addr, argv[0])) {
 182                 fprintf(stderr, "invalid mac address\n");
 183                 return 2;
 184         }
 185
 186         argc--;
 187         argv++;
 188
 189         if (argc)
 190                 return 1;
 191
 192         NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, mac_addr);
 193
 194         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_sta_handler, NULL);
 195
 196         return 0;
 197  nla_put_failure:
 198         return -ENOBUFS;
 199 }
 200 COMMAND(station, get, "<MAC address>",
 201         NL80211_CMD_GET_STATION, 0, CIB_NETDEV, handle_station_get,
 202         "Get information for a specific station.");
 203 COMMAND(station, del, "<MAC address>",
 204         NL80211_CMD_DEL_STATION, 0, CIB_NETDEV, handle_station_get,
 205         "Remove the given station entry (use with caution!)");
 206
 207 static const struct cmd *station_set_plink;
 208 static const struct cmd *station_set_vlan;
 209
 210 static const struct cmd *select_station_cmd(int argc, char **argv)
 211 {
 212         if (argc < 2)
 213                 return NULL;
 214         if (strcmp(argv[1], "plink_action") == 0)
 215                 return station_set_plink;
 216         if (strcmp(argv[1], "vlan") == 0)
 217                 return station_set_vlan;
 218         return NULL;
 219 }
 220
 221 static int handle_station_set_plink(struct nl80211_state *state,
 222                               struct nl_cb *cb,
 223                               struct nl_msg *msg,
 224                               int argc, char **argv)
 225 {
 226         unsigned char plink_action;
 227         unsigned char mac_addr[ETH_ALEN];
 228
 229         if (argc < 3)
 230                 return 1;
 231
 232         if (mac_addr_a2n(mac_addr, argv[0])) {
 233                 fprintf(stderr, "invalid mac address\n");
 234                 return 2;
 235         }
 236         argc--;
 237         argv++;
 238
 239         if (strcmp("plink_action", argv[0]) != 0)
 240                 return 1;
 241         argc--;
 242         argv++;
 243
 244         if (strcmp("open", argv[0]) == 0)
 245                 plink_action = PLINK_ACTION_OPEN;
 246         else if (strcmp("block", argv[0]) == 0)
 247                 plink_action = PLINK_ACTION_BLOCK;
 248         else {
 249                 fprintf(stderr, "plink action not supported\n");
 250                 return 2;
 251         }
 252         argc--;
 253         argv++;
 254
 255         if (argc)
 256                 return 1;
 257
 258         NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, mac_addr);
 259         NLA_PUT_U8(msg, NL80211_ATTR_STA_PLINK_ACTION, plink_action);
 260
 261         return 0;
 262  nla_put_failure:
 263         return -ENOBUFS;
 264 }
 265 COMMAND_ALIAS(station, set, "<MAC address> plink_action <open|block>",
 266         NL80211_CMD_SET_STATION, 0, CIB_NETDEV, handle_station_set_plink,
 267         "Set mesh peer link action for this station (peer).",
 268         select_station_cmd, station_set_plink);
 269
 270 static int handle_station_set_vlan(struct nl80211_state *state,
 271                               struct nl_cb *cb,
 272                               struct nl_msg *msg,
 273                               int argc, char **argv)
 274 {
 275         unsigned char mac_addr[ETH_ALEN];
 276         unsigned long sta_vlan = 0;
 277         char *err = NULL;
 278
 279         if (argc < 3)
 280                 return 1;
 281
 282         if (mac_addr_a2n(mac_addr, argv[0])) {
 283                 fprintf(stderr, "invalid mac address\n");
 284                 return 2;
 285         }
 286         argc--;
 287         argv++;
 288
 289         if (strcmp("vlan", argv[0]) != 0)
 290                 return 1;
 291         argc--;
 292         argv++;
 293
 294         sta_vlan = strtoul(argv[0], &err, 0);
 295         if (err && *err) {
 296                 fprintf(stderr, "invalid vlan id\n");
 297                 return 2;
 298         }
 299         argc--;
 300         argv++;
 301
 302         if (argc)
 303                 return 1;
 304
 305         NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, mac_addr);
 306         NLA_PUT_U32(msg, NL80211_ATTR_STA_VLAN, sta_vlan);
 307
 308         return 0;
 309  nla_put_failure:
 310         return -ENOBUFS;
 311 }
 312 COMMAND_ALIAS(station, set, "<MAC address> vlan <ifindex>",
 313         NL80211_CMD_SET_STATION, 0, CIB_NETDEV, handle_station_set_vlan,
 314         "Set an AP VLAN for this station.",
 315         select_station_cmd, station_set_vlan);
 316
 317
 318 static int handle_station_dump(struct nl80211_state *state,
 319                                struct nl_cb *cb,
 320                                struct nl_msg *msg,
 321                                int argc, char **argv)
 322 {
 323         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_sta_handler, NULL);
 324         return 0;
 325 }
 326 COMMAND(station, dump, NULL,
 327         NL80211_CMD_GET_STATION, NLM_F_DUMP, CIB_NETDEV, handle_station_dump,
 328         "List all stations known, e.g. the AP on managed interfaces");