wifi: always build nl80211 CRIT_PROTOCOL support

netlink's API is stable, and strictly defined by the integer values that make
up commands and attributes. There is little reason do disable a netlink feature
based on compile time detection of the kernel headers.

Either kernel supports it, or it will fail with an appropriate response.

Also, support for NL80211_CMD_CRIT_PROTOCOL_START was merge to kernel
in 2013. Maybe, we should now just always assume support (in the kernel
headers is there). Anyway, don't do that yet, but instead avoid the
defines and use the numeric values directly.

config.h.meson

@@ -38,9 +38,6 @@
 /* Define to 1 if libsystemd is available */
 #mesondefine HAVE_LIBSYSTEMD
 
-/* Define if nl80211 has critical protocol support */
-#mesondefine HAVE_NL80211_CRITICAL_PROTOCOL_CMDS
-
 /* Define to 1 if you have the `secure_getenv' function. */
 #mesondefine HAVE_SECURE_GETENV
 

configure.ac

@@ -242,30 +242,6 @@ if test "$ac_have_nl80211" = no; then
 	AC_MSG_ERROR(Linux kernel development header linux/nl80211.h not installed or not functional)
 fi
 
-if test "$with_wifi" = "yes"; then
-	AC_MSG_CHECKING([Linux kernel nl80211 Critical Protocol Start/Stop])
-	AC_COMPILE_IFELSE(
-	                  [AC_LANG_PROGRAM(
-	                                   [[#ifndef __user
-	                                     #define __user
-	                                     #endif
-	                                     #include <sys/types.h>
-	                                     #include <linux/types.h>
-	                                     #include <sys/socket.h>
-	                                     #include <linux/nl80211.h>]],
-	                                   [[unsigned a = NL80211_CMD_CRIT_PROTOCOL_START; a++;]])],
-	                  [ac_have_nl80211_critproto=yes],
-	                  [ac_have_nl80211_critproto=no])
-	AC_MSG_RESULT($ac_have_nl80211_critproto)
-else
-	ac_have_nl80211_critproto='no'
-fi
-if test "$ac_have_nl80211_critproto" = yes; then
-	AC_DEFINE(HAVE_NL80211_CRITICAL_PROTOCOL_CMDS, 1, [Define if nl80211 has critical protocol support])
-else
-	AC_DEFINE(HAVE_NL80211_CRITICAL_PROTOCOL_CMDS, 0, [Define if nl80211 has critical protocol support])
-fi
-
 dnl
 dnl Default to using wpa_supplicant but allow IWD as wifi backend
 dnl

meson.build

@@ -285,22 +285,6 @@ if enable_wifi
   '''
 
   assert(cc.compiles(nl80211_src), 'Linux kernel development header linux/nl80211.h not installed or not functional')
-
-  nl80211_crit_proto_src = '''
-    #ifndef __user
-    #define __user
-    #endif
-    #include <sys/types.h>
-    #include <linux/types.h>
-    #include <sys/socket.h>
-    #include <linux/nl80211.h>
-    int main() {
-      unsigned a = NL80211_CMD_CRIT_PROTOCOL_START;
-      a++;
-    }
-  '''
-
-  config_h.set10('HAVE_NL80211_CRITICAL_PROTOCOL_CMDS', cc.compiles(nl80211_crit_proto_src))
 endif
 config_h.set10('WITH_WIFI', enable_wifi)
 

src/platform/nm-fake-platform.c

@@ -938,7 +938,6 @@ wifi_find_frequency (NMPlatform *platform, int ifindex, const guint32 *freqs)
 static void
 wifi_indicate_addressing_running (NMPlatform *platform, int ifindex, gboolean running)
 {
-	;
 }
 
 static guint32

src/platform/wifi/wifi-utils-nl80211.c

@@ -792,7 +792,6 @@ wifi_nl80211_get_qual (WifiData *data)
 	return sta_info.signal;
 }
 
-#if HAVE_NL80211_CRITICAL_PROTOCOL_CMDS
 static gboolean
 wifi_nl80211_indicate_addressing_running (WifiData *data, gboolean running)
 {
@@ -801,16 +800,21 @@ wifi_nl80211_indicate_addressing_running (WifiData *data, gboolean running)
 	int err;
 
 	msg = nl80211_alloc_msg (nl80211,
-	                         running ? NL80211_CMD_CRIT_PROTOCOL_START :
+	                         running
-	                         NL80211_CMD_CRIT_PROTOCOL_STOP,
+	                           ? 98 /* NL80211_CMD_CRIT_PROTOCOL_START */
+	                           : 99 /* NL80211_CMD_CRIT_PROTOCOL_STOP */,
 	                         0);
 	/* Despite the DHCP name, we're using this for any type of IP addressing,
 	 * DHCPv4, DHCPv6, and IPv6 SLAAC.
 	 */
-	NLA_PUT_U16 (msg, NL80211_ATTR_CRIT_PROT_ID, NL80211_CRIT_PROTO_DHCP);
+	NLA_PUT_U16 (msg,
+	             179 /* NL80211_ATTR_CRIT_PROT_ID */,
+	             1 /* NL80211_CRIT_PROTO_DHCP */);
 	if (running) {
 		/* Give DHCP 5 seconds to complete */
-		NLA_PUT_U16 (msg, NL80211_ATTR_MAX_CRIT_PROT_DURATION, 5000);
+		NLA_PUT_U16 (msg,
+		             180 /* NL80211_ATTR_MAX_CRIT_PROT_DURATION */,
+		             5000);
 	}
 
 	err = nl80211_send_and_recv (nl80211, msg, NULL, NULL);
@@ -820,7 +824,6 @@ nla_put_failure:
 	nlmsg_free (msg);
 	return FALSE;
 }
-#endif
 
 struct nl80211_wowlan_info {
 	gboolean enabled;
@@ -1077,9 +1080,7 @@ wifi_nl80211_init (int ifindex)
 		.get_rate = wifi_nl80211_get_rate,
 		.get_qual = wifi_nl80211_get_qual,
 		.get_wowlan = wifi_nl80211_get_wowlan,
-#if HAVE_NL80211_CRITICAL_PROTOCOL_CMDS
 		.indicate_addressing_running = wifi_nl80211_indicate_addressing_running,
-#endif
 		.deinit = wifi_nl80211_deinit,
 	};
 	WifiDataNl80211 *nl80211;