On Mon, Apr 13, 2015 at 05:31:14PM +0200, Jean-Pierre Tosoni wrote:
> A really weird patch that splits the U-NII-2e band into 1, 2 or 3
> sub-bands to enforce a CAC time of 10 minutes in the range 5600-5650 MHz.
Wrong maintainer / list. CRDA patches should be directed to Luis and the
linux-wireless list (feel free to Cc wireless-regdb if you like).
Seth
> ---
>
> I came with the following patch to enforce ETSI regulation in Europe for
> weather channels.
> It applies to crda and when it encounters this frequency range, it splits it
> out and enforces the 10 minutes CAC.
> I know it's weird as is, I just wonder if it's the good way of solving this
> until CAC is in regulatory.bin or the kernel takes care of it.
>
> crda.c | 104
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++------
> 1 files changed, 94 insertions(+), 10 deletions(-)
>
> diff --git a/crda.c b/crda.c
> index f40131f..4c4aeba 100644
> --- a/crda.c
> +++ b/crda.c
> @@ -140,6 +140,36 @@ nla_put_failure:
> return -1;
> }
>
> +static int put_dom_reg_rule(struct ieee80211_reg_rule *rule, struct nl_msg
> *msg, int i)
> +{
> + int r;
> + struct nlattr *nl_reg_rule;
> + unsigned long width;
> +
> + width = rule->freq_range.end_freq_khz -
> rule->freq_range.start_freq_khz;
> + if (width <= 0)
> + return 0; // nothing to do -- assert success
> +
> + nl_reg_rule = nla_nest_start(msg, i);
> + if (!nl_reg_rule)
> + return 1;
> +
> + if (width < rule->freq_range.max_bandwidth_khz) {
> + if (width >= 160000) rule->freq_range.max_bandwidth_khz =
> 160000;
> + else if (width >= 80000) rule->freq_range.max_bandwidth_khz
> = 80000;
> + else if (width >= 40000) rule->freq_range.max_bandwidth_khz
> = 40000;
> + else if (width >= 20000) rule->freq_range.max_bandwidth_khz
> = 20000;
> + else if (width >= 10000) rule->freq_range.max_bandwidth_khz
> = 10000;
> + else rule->freq_range.max_bandwidth_khz = 5000;
> + }
> + r = put_reg_rule(rule, msg);
> + if (r)
> + return 1;
> +
> + nla_nest_end(msg, nl_reg_rule);
> + return 0;
> +}
> +
> int main(int argc, char **argv)
> {
> int fd = -1;
> @@ -228,16 +258,70 @@ int main(int argc, char **argv)
> }
>
> for (j = 0; j < rd->n_reg_rules; j++) {
> - struct nlattr *nl_reg_rule;
> - nl_reg_rule = nla_nest_start(msg, i);
> - if (!nl_reg_rule)
> - goto nla_put_failure;
> -
> - r = put_reg_rule(&rd->reg_rules[j], msg);
> - if (r)
> - goto nla_put_failure;
> -
> - nla_nest_end(msg, nl_reg_rule);
> + const struct ieee80211_reg_rule *rule = &rd->reg_rules[j];
> +
> +#define METEO_BAND_START (5600 * 1000)
> +#define METEO_BAND_BEFORE_START (5570 * 1000) // to allow BW=40
> and 80
> +#define METEO_BAND_END (5650 * 1000)
> + if (rd->dfs_region == REGDB_DFS_ETSI
> + && rule->freq_range.start_freq_khz < METEO_BAND_END
> + && rule->freq_range.end_freq_khz > METEO_BAND_START) {
> + struct ieee80211_reg_rule split_rule;
> + /*
> + * ETSI rule including all or part of the weather
> band
> + *
> + * If necessary the frequency range is split in 3
> + * to allow inserting the 10 minutes CAC in the 2nd
> one
> + */
> + /* If the range overlaps the 5600 MHz frequency */
> + if (rule->freq_range.start_freq_khz <
> METEO_BAND_BEFORE_START) {
> +
> + /* copy band data (CAC, BW...) */
> + split_rule = *rule;
> + /* remove upper channels */
> + split_rule.freq_range.end_freq_khz =
> METEO_BAND_BEFORE_START;
> +
> + /* configure lower channels */
> + if (put_dom_reg_rule(&split_rule, msg, i))
> + goto nla_put_failure;
> + }
> +
> + /* The rest necessarily begins before 5650 MHz */
> + /* copy band data (CAC, BW...) */
> + split_rule = *rule;
> + if (rule->freq_range.start_freq_khz <
> METEO_BAND_BEFORE_START) {
> + split_rule.freq_range.start_freq_khz =
> METEO_BAND_BEFORE_START;
> + }
> +
> + /* compute center range */
> + if (rule->freq_range.end_freq_khz <= METEO_BAND_END)
> + split_rule.freq_range.end_freq_khz =
> rule->freq_range.end_freq_khz;
> + else
> + split_rule.freq_range.end_freq_khz =
> METEO_BAND_END;
> + split_rule.dfs_cac_ms = 10 * 60 * 1000; /* 10
> minutes */
> +
> + /* configure weather frequencies */
> + if (put_dom_reg_rule(&split_rule, msg, i))
> + goto nla_put_failure;
> +
> + /* If the range overlaps the 5650 MHz frequency */
> + if (rule->freq_range.end_freq_khz > METEO_BAND_END)
> {
> +
> + /* copy band data (CAC, BW...) */
> + split_rule = *rule; /* copie les donnees de
> la bande */
> + /* remove lower channels */
> + split_rule.freq_range.start_freq_khz =
> METEO_BAND_END;
> +
> + /* configure higher channels */
> + if (put_dom_reg_rule(&split_rule, msg, i))
> + goto nla_put_failure;
> + }
> + } else {
> + /* configure the whole range */
> + /* WARNING: this fonction may change
> (const)rule->...max_bandwidth_khz */
> + if (put_dom_reg_rule((struct ieee80211_reg_rule
> *)rule, msg, i))
> + goto nla_put_failure;
> + }
> }
>
> nla_nest_end(msg, nl_reg_rules);
> --
> 1.7.2.5
>
>
