bitrate.c

   1 #include <errno.h>
   2
   3 #include "nl80211.h"
   4 #include "iw.h"
   5
   6
   7 static int parse_vht_chunk(const char *arg, __u8 *nss, __u16 *mcs)
   8 {
   9         int count, i;
  10         unsigned int inss, mcs_start, mcs_end, tab[10];
  11
  12         *nss = 0; *mcs = 0;
  13
  14         if (strchr(arg, '-')) {
  15                 /* Format: NSS:MCS_START-MCS_END */
  16                 count = sscanf(arg, "%u:%u-%u", &inss, &mcs_start, &mcs_end);
  17
  18                 if (count != 3)
  19                         return 0;
  20
  21                 if (inss < 1 || inss > NL80211_VHT_NSS_MAX)
  22                         return 0;
  23
  24                 if (mcs_start > mcs_end)
  25                         return 0;
  26
  27                 if (mcs_start > 9 || mcs_end > 9)
  28                         return 0;
  29
  30                 *nss = inss;
  31                 for (i = mcs_start; i <= mcs_end; i++)
  32                         *mcs |= 1 << i;
  33
  34         } else {
  35                 /* Format: NSS:MCSx,MCSy,... */
  36                 count = sscanf(arg, "%u:%u,%u,%u,%u,%u,%u,%u,%u,%u,%u", &inss,
  37                            &tab[0], &tab[1], &tab[2], &tab[3], &tab[4], &tab[5],
  38                            &tab[6], &tab[7], &tab[8], &tab[9]);
  39
  40                 if (count < 2)
  41                         return 0;
  42
  43                 if (inss < 1 || inss > NL80211_VHT_NSS_MAX)
  44                         return 0;
  45
  46                 *nss = inss;
  47                 for (i = 0; i < count - 1; i++) {
  48                         if (tab[i] > 9)
  49                                 return 0;
  50                         *mcs |= 1 << tab[i];
  51                 }
  52         }
  53
  54         return 1;
  55 }
  56
  57 static int setup_vht(struct nl80211_txrate_vht *txrate_vht,
  58                      int argc, char **argv)
  59 {
  60         __u8 nss;
  61         __u16 mcs;
  62         int i;
  63
  64         memset(txrate_vht, 0, sizeof(*txrate_vht));
  65
  66         for (i = 0; i < argc; i++) {
  67                 if(!parse_vht_chunk(argv[i], &nss, &mcs))
  68                         return 0;
  69
  70                 nss--;
  71                 txrate_vht->mcs[nss] |= mcs;
  72         }
  73
  74         return 1;
  75 }
  76
  77 #define VHT_ARGC_MAX    100
  78
  79 static int handle_bitrates(struct nl80211_state *state,
  80                            struct nl_cb *cb,
  81                            struct nl_msg *msg,
  82                            int argc, char **argv,
  83                            enum id_input id)
  84 {
  85         struct nlattr *nl_rates, *nl_band;
  86         int i;
  87         bool have_legacy_24 = false, have_legacy_5 = false;
  88         uint8_t legacy_24[32], legacy_5[32];
  89         int n_legacy_24 = 0, n_legacy_5 = 0;
  90         uint8_t *legacy = NULL;
  91         int *n_legacy = NULL;
  92         bool have_ht_mcs_24 = false, have_ht_mcs_5 = false;
  93         bool have_vht_mcs_24 = false, have_vht_mcs_5 = false;
  94         uint8_t ht_mcs_24[77], ht_mcs_5[77];
  95         int n_ht_mcs_24 = 0, n_ht_mcs_5 = 0;
  96         struct nl80211_txrate_vht txrate_vht_24 = {};
  97         struct nl80211_txrate_vht txrate_vht_5 = {};
  98         uint8_t *mcs = NULL;
  99         int *n_mcs = NULL;
 100         char *vht_argv_5[VHT_ARGC_MAX] = {}; char *vht_argv_24[VHT_ARGC_MAX] = {};
 101         char **vht_argv = NULL;
 102         int vht_argc_5 = 0; int vht_argc_24 = 0;
 103         int *vht_argc = NULL;
 104
 105         enum {
 106                 S_NONE,
 107                 S_LEGACY,
 108                 S_HT,
 109                 S_VHT,
 110         } parser_state = S_NONE;
 111
 112         for (i = 0; i < argc; i++) {
 113                 char *end;
 114                 double tmpd;
 115                 long tmpl;
 116
 117                 if (strcmp(argv[i], "legacy-2.4") == 0) {
 118                         if (have_legacy_24)
 119                                 return 1;
 120                         parser_state = S_LEGACY;
 121                         legacy = legacy_24;
 122                         n_legacy = &n_legacy_24;
 123                         have_legacy_24 = true;
 124                 } else if (strcmp(argv[i], "legacy-5") == 0) {
 125                         if (have_legacy_5)
 126                                 return 1;
 127                         parser_state = S_LEGACY;
 128                         legacy = legacy_5;
 129                         n_legacy = &n_legacy_5;
 130                         have_legacy_5 = true;
 131                 }
 132                 else if (strcmp(argv[i], "ht-mcs-2.4") == 0) {
 133                         if (have_ht_mcs_24)
 134                                 return 1;
 135                         parser_state = S_HT;
 136                         mcs = ht_mcs_24;
 137                         n_mcs = &n_ht_mcs_24;
 138                         have_ht_mcs_24 = true;
 139                 } else if (strcmp(argv[i], "ht-mcs-5") == 0) {
 140                         if (have_ht_mcs_5)
 141                                 return 1;
 142                         parser_state = S_HT;
 143                         mcs = ht_mcs_5;
 144                         n_mcs = &n_ht_mcs_5;
 145                         have_ht_mcs_5 = true;
 146                 } else if (strcmp(argv[i], "vht-mcs-2.4") == 0) {
 147                         if (have_vht_mcs_24)
 148                                 return 1;
 149                         parser_state = S_VHT;
 150                         vht_argv = vht_argv_24;
 151                         vht_argc = &vht_argc_24;
 152                         have_vht_mcs_24 = true;
 153                 } else if (strcmp(argv[i], "vht-mcs-5") == 0) {
 154                         if (have_vht_mcs_5)
 155                                 return 1;
 156                         parser_state = S_VHT;
 157                         vht_argv = vht_argv_5;
 158                         vht_argc = &vht_argc_5;
 159                         have_vht_mcs_5 = true;
 160                 }
 161                 else switch (parser_state) {
 162                 case S_LEGACY:
 163                         tmpd = strtod(argv[i], &end);
 164                         if (*end != '\0')
 165                                 return 1;
 166                         if (tmpd < 1 || tmpd > 255 * 2)
 167                                 return 1;
 168                         legacy[(*n_legacy)++] = tmpd * 2;
 169                         break;
 170                 case S_HT:
 171                         tmpl = strtol(argv[i], &end, 0);
 172                         if (*end != '\0')
 173                                 return 1;
 174                         if (tmpl < 0 || tmpl > 255)
 175                                 return 1;
 176                         mcs[(*n_mcs)++] = tmpl;
 177                         break;
 178                 case S_VHT:
 179                         if (*vht_argc >= VHT_ARGC_MAX)
 180                                 return 1;
 181                         vht_argv[(*vht_argc)++] = argv[i];
 182                         break;
 183                 default:
 184                         return 1;
 185                 }
 186         }
 187
 188         if (have_vht_mcs_24)
 189                 if(!setup_vht(&txrate_vht_24, vht_argc_24, vht_argv_24))
 190                         return -EINVAL;
 191
 192         if (have_vht_mcs_5)
 193                 if(!setup_vht(&txrate_vht_5, vht_argc_5, vht_argv_5))
 194                         return -EINVAL;
 195
 196         nl_rates = nla_nest_start(msg, NL80211_ATTR_TX_RATES);
 197         if (!nl_rates)
 198                 goto nla_put_failure;
 199
 200         if (have_legacy_24 || have_ht_mcs_24 || have_vht_mcs_24) {
 201                 nl_band = nla_nest_start(msg, NL80211_BAND_2GHZ);
 202                 if (!nl_band)
 203                         goto nla_put_failure;
 204                 if (have_legacy_24)
 205                         nla_put(msg, NL80211_TXRATE_LEGACY, n_legacy_24, legacy_24);
 206                 if (have_ht_mcs_24)
 207                         nla_put(msg, NL80211_TXRATE_HT, n_ht_mcs_24, ht_mcs_24);
 208                 if (have_vht_mcs_24)
 209                         nla_put(msg, NL80211_TXRATE_VHT, sizeof(txrate_vht_24), &txrate_vht_24);
 210                 nla_nest_end(msg, nl_band);
 211         }
 212
 213         if (have_legacy_5 || have_ht_mcs_5 || have_vht_mcs_5) {
 214                 nl_band = nla_nest_start(msg, NL80211_BAND_5GHZ);
 215                 if (!nl_band)
 216                         goto nla_put_failure;
 217                 if (have_legacy_5)
 218                         nla_put(msg, NL80211_TXRATE_LEGACY, n_legacy_5, legacy_5);
 219                 if (have_ht_mcs_5)
 220                         nla_put(msg, NL80211_TXRATE_HT, n_ht_mcs_5, ht_mcs_5);
 221                 if (have_vht_mcs_5)
 222                         nla_put(msg, NL80211_TXRATE_VHT, sizeof(txrate_vht_5), &txrate_vht_5);
 223                 nla_nest_end(msg, nl_band);
 224         }
 225
 226         nla_nest_end(msg, nl_rates);
 227
 228         return 0;
 229  nla_put_failure:
 230         return -ENOBUFS;
 231 }
 232
 233 #define DESCR_LEGACY "[legacy-<2.4|5> <legacy rate in Mbps>*]"
 234 #define DESCR DESCR_LEGACY " [ht-mcs-<2.4|5> <MCS index>*] [vht-mcs-<2.4|5> <NSS:MCSx,MCSy... | NSS:MCSx-MCSy>*]"
 235
 236 COMMAND(set, bitrates, "[legacy-<2.4|5> <legacy rate in Mbps>*] [ht-mcs-<2.4|5> <MCS index>*] [vht-mcs-<2.4|5> <NSS:MCSx,MCSy... | NSS:MCSx-MCSy>*]",
 237         NL80211_CMD_SET_TX_BITRATE_MASK, 0, CIB_NETDEV, handle_bitrates,
 238         "Sets up the specified rate masks.\n"
 239         "Not passing any arguments would clear the existing mask (if any).");