package/iw/patches/100-coverage_class.patch

   1 --- a/info.c
   2 +++ b/info.c
   3 @@ -156,6 +156,14 @@ static int print_phy_handler(struct nl_m
   4                         printf("\tRTS threshold: %d\n", rts);
   5         }
   6
   7 +       if (tb_msg[NL80211_ATTR_WIPHY_COVERAGE_CLASS]) {
   8 +               unsigned char coverage;
   9 +
  10 +               coverage = nla_get_u8(tb_msg[NL80211_ATTR_WIPHY_COVERAGE_CLASS]);
  11 +               /* See handle_distance() for an explanation where the '450' comes from */
  12 +               printf("\tCoverage class: %d (up to %dm)\n", coverage, 450 * coverage);
  13 +       }
  14 +
  15         if (!tb_msg[NL80211_ATTR_SUPPORTED_IFTYPES])
  16                 goto commands;
  17
  18 --- a/phy.c
  19 +++ b/phy.c
  20 @@ -164,3 +164,61 @@ static int handle_netns(struct nl80211_s
  21  COMMAND(set, netns, "<pid>",
  22         NL80211_CMD_SET_WIPHY_NETNS, 0, CIB_PHY, handle_netns,
  23         "Put this wireless device into a different network namespace");
  24 +
  25 +static int handle_coverage(struct nl80211_state *state,
  26 +                       struct nl_cb *cb,
  27 +                       struct nl_msg *msg,
  28 +                       int argc, char **argv)
  29 +{
  30 +       unsigned int coverage;
  31 +
  32 +       if (argc != 1)
  33 +               return 1;
  34 +
  35 +       coverage = strtoul(argv[0], NULL, 10);
  36 +       if (coverage > 255)
  37 +               return 1;
  38 +
  39 +       NLA_PUT_U8(msg, NL80211_ATTR_WIPHY_COVERAGE_CLASS, coverage);
  40 +
  41 +       return 0;
  42 + nla_put_failure:
  43 +       return -ENOBUFS;
  44 +}
  45 +COMMAND(set, coverage, "<coverage class>",
  46 +       NL80211_CMD_SET_WIPHY, 0, CIB_PHY, handle_coverage,
  47 +       "Set coverage class (1 for every 3 usec of air propagation time).\n"
  48 +       "Valid values: 0 - 255.");
  49 +
  50 +static int handle_distance(struct nl80211_state *state,
  51 +                       struct nl_cb *cb,
  52 +                       struct nl_msg *msg,
  53 +                       int argc, char **argv)
  54 +{
  55 +       unsigned int distance, coverage;
  56 +
  57 +       if (argc != 1)
  58 +               return 1;
  59 +
  60 +       distance = strtoul(argv[0], NULL, 10);
  61 +
  62 +       /*
  63 +        * Divide double the distance by the speed of light in m/usec (300) to
  64 +        * get round-trip time in microseconds and then divide the result by
  65 +        * three to get coverage class as specified in IEEE 802.11-2007 table
  66 +        * 7-27. Values are rounded upwards.
  67 +        */
  68 +       coverage = (distance + 449) / 450;
  69 +       if (coverage > 255)
  70 +               return 1;
  71 +
  72 +       NLA_PUT_U8(msg, NL80211_ATTR_WIPHY_COVERAGE_CLASS, coverage);
  73 +
  74 +       return 0;
  75 + nla_put_failure:
  76 +       return -ENOBUFS;
  77 +}
  78 +COMMAND(set, distance, "<distance>",
  79 +       NL80211_CMD_SET_WIPHY, 0, CIB_PHY, handle_distance,
  80 +       "Set appropriate coverage class for given link distance in meters.\n"
  81 +       "Valid values: 0 - 114750");