To use DFS in IBSS mode, userspace is required to react to radar events. It can inform nl80211 that it is capable of doing so by adding a NL80211_ATTR_HANDLE_DFS attribute when joining the IBSS. This attribute is supplied to let the kernelspace know that the userspace application can and will handle radar events, e.g. by intiating channel switches to a valid channel. DFS channels may only be used if this attribute is supplied and the driver supports it. Driver support will be checked even if a channel without DFS will be initially joined, as a DFS channel may be chosen later.
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| @@ -1501,6 +1501,13 @@ enum nl80211_commands { · 1500 unmodified lines | |||
| 1501 | * @NL80211_ATTR_STA_SUPPORTED_OPER_CLASSES: array of supported | 1501 | * @NL80211_ATTR_STA_SUPPORTED_OPER_CLASSES: array of supported |
| 1502 | * supported operating classes. | 1502 | * supported operating classes. |
| 1503 | * | 1503 | * |
| 1504 | * @NL80211_ATTR_HANDLE_DFS: A flag indicating whether user space | ||
| 1505 | * controls DFS operation in IBSS mode. If the flag is included in | ||
| 1506 | * %NL80211_CMD_JOIN_IBSS request, the driver will allow use of DFS | ||
| 1507 | * channels and reports radar events to userspace. Userspace is required | ||
| 1508 | * to react to radar events, e.g. initiate a channel switch or leave the | ||
| 1509 | * IBSS network. | ||
| 1510 | * | ||
| 1504 | * @NL80211_ATTR_MAX: highest attribute number currently defined | 1511 | * @NL80211_ATTR_MAX: highest attribute number currently defined |
| 1505 | * @__NL80211_ATTR_AFTER_LAST: internal use | 1512 | * @__NL80211_ATTR_AFTER_LAST: internal use |
| 1506 | */ | 1513 | */ |
| @@ -1815,6 +1822,8 @@ enum nl80211_attrs { · 308 unmodified lines | |||
| 1815 | 1822 | ||
| 1816 | NL80211_ATTR_STA_SUPPORTED_OPER_CLASSES, | 1823 | NL80211_ATTR_STA_SUPPORTED_OPER_CLASSES, |
| 1817 | 1824 | ||
| 1825 | NL80211_ATTR_HANDLE_DFS, | ||
| 1826 | |||
| 1818 | /* add attributes here, update the policy in nl80211.c */ | 1827 | /* add attributes here, update the policy in nl80211.c */ |
| 1819 | 1828 | ||
| 1820 | __NL80211_ATTR_AFTER_LAST, | 1829 | __NL80211_ATTR_AFTER_LAST, |