LinuxKPI 802.11: change type of bssid in struct ieee80211_bss_conf

Enabling other driver code found that the bssid in
struct ieee80211_bss_conf is not an array but expected to be
a const pointer (const, != NULL checks).
Adjust accordingly in the header and in the LinuxKPI compat code.
There initialization now needs to be a static array always present
as we need a value before we will have a BSS (node in scan_to_auth)
as the mac80211 driver (*handlers) are expecting the pointer to be
not NULL (copying without checks).
This is a pre-req to enable d3 (CONFIG_PM[_SLEEP]) in the future.

Tested by:	Tomoaki AOKI (junchoon dec.sakura.ne.jp)
Tested by:	Berislav Purgar (bpurgar gmail.com)
Sponsored by:	The FreeBSD Foundation
MFC after:	3 days

2 files changed, 14 insertions, 2 deletions

diff --git a/sys/compat/linuxkpi/common/include/net/mac80211.h b/sys/compat/linuxkpi/common/include/net/mac80211.h
index 4320edc90eba..13ae7bb99376 100644
--- a/sys/compat/linuxkpi/common/include/net/mac80211.h
+++ b/sys/compat/linuxkpi/common/include/net/mac80211.h
@@ -215,7 +215,7 @@ struct mac80211_fils_discovery {
 
 struct ieee80211_bss_conf {
 	/* TODO FIXME */
-	uint8_t					bssid[ETH_ALEN];
+	const uint8_t				*bssid;
 	uint8_t					transmitter_bssid[ETH_ALEN];
 	struct ieee80211_ftm_responder_params	*ftmr_params;
 	struct ieee80211_p2p_noa_attr		p2p_noa_attr;
diff --git a/sys/compat/linuxkpi/common/src/linux_80211.c b/sys/compat/linuxkpi/common/src/linux_80211.c
index a98ed56fcdad..4ec54400c166 100644
--- a/sys/compat/linuxkpi/common/src/linux_80211.c
+++ b/sys/compat/linuxkpi/common/src/linux_80211.c
@@ -115,6 +115,9 @@ SYSCTL_INT(_compat_linuxkpi_80211, OID_AUTO, debug, CTLFLAG_RWTUN,
 #define	PREP_TX_INFO_DURATION	0 /* Let the driver do its thing. */
 #endif
 
+/* c.f. ieee80211_ioctl.c */
+static const uint8_t zerobssid[IEEE80211_ADDR_LEN];
+
 /* This is DSAP | SSAP | CTRL | ProtoID/OrgCode{3}. */
 const uint8_t rfc1042_header[6] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
 
@@ -996,7 +999,7 @@ lkpi_sta_scan_to_auth(struct ieee80211vap *vap, enum ieee80211_state nstate, int
 
 	/* Set bss info (bss_info_changed). */
 	bss_changed = 0;
-	IEEE80211_ADDR_COPY(vif->bss_conf.bssid, ni->ni_bssid);
+	vif->bss_conf.bssid = ni->ni_bssid;
 	bss_changed |= BSS_CHANGED_BSSID;
 	vif->bss_conf.txpower = ni->ni_txpower;
 	bss_changed |= BSS_CHANGED_TXPOWER;
@@ -2230,6 +2233,15 @@ lkpi_ic_vap_create(struct ieee80211com *ic, const char name[IFNAMSIZ],
 	vif->bss_conf.ht_operation_mode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
 	vif->bss_conf.assoc = false;
 	vif->bss_conf.aid = 0;
+	/*
+	 * We need to initialize it to something as the bss_info_changed call
+	 * will try to copy from it in iwlwifi and NULL is a panic.
+	 * We will set the proper one in scan_to_auth() before being assoc.
+	 * NB: the logic there with using an array as bssid_override and checking
+	 * for non-NULL later is flawed but in their workflow does not seem to
+	 * matter.
+	 */
+	vif->bss_conf.bssid = zerobssid;
 #endif
 #if 0
 	vif->bss_conf.dtim_period = 0; /* IEEE80211_DTIM_DEFAULT ; must stay 0. */