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cfg80211: introduce critical protocol indication from user-space

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Some protocols need a more reliable connection to complete
successful in reasonable time. This patch adds a user-space
API to indicate the wireless driver that a critical protocol
is about to commence and when it is done, using nl80211 primitives
NL80211_CMD_CRIT_PROTOCOL_START and NL80211_CRIT_PROTOCOL_STOP.

There can be only on critical protocol session started per
registered cfg80211 device.

The driver can support this by implementing the cfg80211 callbacks
.crit_proto_start() and .crit_proto_stop(). Examples of protocols
that can benefit from this are DHCP, EAPOL, APIPA. Exactly how the
link can/should be made more reliable is up to the driver. Things
to consider are avoid scanning, no multi-channel operations, and
alter coexistence schemes.

Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Arend van Spriel
2013-04-18 15:49:00 +02:00
committed by Johannes Berg
parent a36473621c
commit 5de1798489
7 changed files with 245 additions and 1 deletions
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39
include/uapi/linux/nl80211.h
View File

@@ -639,6 +639,13 @@
* with the relevant Information Elements. This event is used to report
* received FT IEs (MDIE, FTIE, RSN IE, TIE, RICIE).
*
* @NL80211_CMD_CRIT_PROTOCOL_START: Indicates user-space will start running
* a critical protocol that needs more reliability in the connection to
* complete.
*
* @NL80211_CMD_CRIT_PROTOCOL_STOP: Indicates the connection reliability can
* return back to normal.
*
* @NL80211_CMD_MAX: highest used command number
* @__NL80211_CMD_AFTER_LAST: internal use
*/
@@ -798,6 +805,9 @@ enum nl80211_commands {
NL80211_CMD_UPDATE_FT_IES,
NL80211_CMD_FT_EVENT,
NL80211_CMD_CRIT_PROTOCOL_START,
NL80211_CMD_CRIT_PROTOCOL_STOP,
/* add new commands above here */
/* used to define NL80211_CMD_MAX below */
@@ -1414,6 +1424,11 @@ enum nl80211_commands {
* @NL80211_ATTR_IE_RIC: Resource Information Container Information
* Element
*
* @NL80211_ATTR_CRIT_PROT_ID: critical protocol identifier requiring increased
* reliability, see &enum nl80211_crit_proto_id (u16).
* @NL80211_ATTR_MAX_CRIT_PROT_DURATION: duration in milliseconds in which
* the connection should have increased reliability (u16).
*
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
*/
@@ -1709,6 +1724,9 @@ enum nl80211_attrs {
NL80211_ATTR_MDID,
NL80211_ATTR_IE_RIC,
NL80211_ATTR_CRIT_PROT_ID,
NL80211_ATTR_MAX_CRIT_PROT_DURATION,
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
@@ -3682,4 +3700,25 @@ enum nl80211_protocol_features {
NL80211_PROTOCOL_FEATURE_SPLIT_WIPHY_DUMP = 1 << 0,
};
/**
* enum nl80211_crit_proto_id - nl80211 critical protocol identifiers
*
* @NL80211_CRIT_PROTO_UNSPEC: protocol unspecified.
* @NL80211_CRIT_PROTO_DHCP: BOOTP or DHCPv6 protocol.
* @NL80211_CRIT_PROTO_EAPOL: EAPOL protocol.
* @NL80211_CRIT_PROTO_APIPA: APIPA protocol.
* @NUM_NL80211_CRIT_PROTO: must be kept last.
*/
enum nl80211_crit_proto_id {
NL80211_CRIT_PROTO_UNSPEC,
NL80211_CRIT_PROTO_DHCP,
NL80211_CRIT_PROTO_EAPOL,
NL80211_CRIT_PROTO_APIPA,
/* add other protocols before this one */
NUM_NL80211_CRIT_PROTO
};
/* maximum duration for critical protocol measures */
#define NL80211_CRIT_PROTO_MAX_DURATION 5000 /* msec */
#endif /* __LINUX_NL80211_H */