--- /dev/null
+From bd54f3c29077f23dad92ef82a78061b40be30c65 Mon Sep 17 00:00:00 2001
+From: Aloka Dixit <quic_alokad@quicinc.com>
+Date: Mon, 5 Dec 2022 16:50:37 -0800
+Subject: [PATCH] wifi: mac80211: generate EMA beacons in AP mode
+
+Add APIs to generate an array of beacons for an EMA AP (enhanced
+multiple BSSID advertisements), each including a single MBSSID element.
+EMA profile periodicity equals the count of elements.
+
+- ieee80211_beacon_get_template_ema_list() - Generate and return all
+EMA beacon templates. Drivers must call ieee80211_beacon_free_ema_list()
+to free the memory. No change in the prototype for the existing API,
+ieee80211_beacon_get_template(), which should be used for non-EMA AP.
+
+- ieee80211_beacon_get_template_ema_index() - Generate a beacon which
+includes the multiple BSSID element at the given index. Drivers can use
+this function in a loop until NULL is returned which indicates end of
+available MBSSID elements.
+
+- ieee80211_beacon_free_ema_list() - free the memory allocated for the
+list of EMA beacon templates.
+
+Modify existing functions ieee80211_beacon_get_ap(),
+ieee80211_get_mbssid_beacon_len() and ieee80211_beacon_add_mbssid()
+to accept a new parameter for EMA index.
+
+Signed-off-by: Aloka Dixit <quic_alokad@quicinc.com>
+Co-developed-by: John Crispin <john@phrozen.org>
+Signed-off-by: John Crispin <john@phrozen.org>
+Link: https://lore.kernel.org/r/20221206005040.3177-2-quic_alokad@quicinc.com
+Signed-off-by: Johannes Berg <johannes.berg@intel.com>
+---
+ include/net/mac80211.h | 68 +++++++++++++++++++
+ net/mac80211/cfg.c | 11 +--
+ net/mac80211/ieee80211_i.h | 10 ++-
+ net/mac80211/tx.c | 134 ++++++++++++++++++++++++++++++++++---
+ 4 files changed, 205 insertions(+), 18 deletions(-)
+
+--- a/include/net/mac80211.h
++++ b/include/net/mac80211.h
+@@ -5252,6 +5252,74 @@ ieee80211_beacon_get_template(struct iee
+ unsigned int link_id);
+
+ /**
++ * ieee80211_beacon_get_template_ema_index - EMA beacon template generation
++ * @hw: pointer obtained from ieee80211_alloc_hw().
++ * @vif: &struct ieee80211_vif pointer from the add_interface callback.
++ * @offs: &struct ieee80211_mutable_offsets pointer to struct that will
++ * receive the offsets that may be updated by the driver.
++ * @link_id: the link id to which the beacon belongs (or 0 for a non-MLD AP).
++ * @ema_index: index of the beacon in the EMA set.
++ *
++ * This function follows the same rules as ieee80211_beacon_get_template()
++ * but returns a beacon template which includes multiple BSSID element at the
++ * requested index.
++ *
++ * Return: The beacon template. %NULL indicates the end of EMA templates.
++ */
++struct sk_buff *
++ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw,
++ struct ieee80211_vif *vif,
++ struct ieee80211_mutable_offsets *offs,
++ unsigned int link_id, u8 ema_index);
++
++/**
++ * struct ieee80211_ema_beacons - List of EMA beacons
++ * @cnt: count of EMA beacons.
++ *
++ * @bcn: array of EMA beacons.
++ * @bcn.skb: the skb containing this specific beacon
++ * @bcn.offs: &struct ieee80211_mutable_offsets pointer to struct that will
++ * receive the offsets that may be updated by the driver.
++ */
++struct ieee80211_ema_beacons {
++ u8 cnt;
++ struct {
++ struct sk_buff *skb;
++ struct ieee80211_mutable_offsets offs;
++ } bcn[];
++};
++
++/**
++ * ieee80211_beacon_get_template_ema_list - EMA beacon template generation
++ * @hw: pointer obtained from ieee80211_alloc_hw().
++ * @vif: &struct ieee80211_vif pointer from the add_interface callback.
++ * @link_id: the link id to which the beacon belongs (or 0 for a non-MLD AP)
++ *
++ * This function follows the same rules as ieee80211_beacon_get_template()
++ * but allocates and returns a pointer to list of all beacon templates required
++ * to cover all profiles in the multiple BSSID set. Each template includes only
++ * one multiple BSSID element.
++ *
++ * Driver must call ieee80211_beacon_free_ema_list() to free the memory.
++ *
++ * Return: EMA beacon templates of type struct ieee80211_ema_beacons *.
++ * %NULL on error.
++ */
++struct ieee80211_ema_beacons *
++ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw,
++ struct ieee80211_vif *vif,
++ unsigned int link_id);
++
++/**
++ * ieee80211_beacon_free_ema_list - free an EMA beacon template list
++ * @ema_beacons: list of EMA beacons of type &struct ieee80211_ema_beacons pointers.
++ *
++ * This function will free a list previously acquired by calling
++ * ieee80211_beacon_get_template_ema_list()
++ */
++void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons);
++
++/**
+ * ieee80211_beacon_get_tim - beacon generation function
+ * @hw: pointer obtained from ieee80211_alloc_hw().
+ * @vif: &struct ieee80211_vif pointer from the add_interface callback.
+--- a/net/mac80211/cfg.c
++++ b/net/mac80211/cfg.c
+@@ -1122,11 +1122,11 @@ static int ieee80211_assign_beacon(struc
+ if (params->mbssid_ies) {
+ mbssid = params->mbssid_ies;
+ size += struct_size(new->mbssid_ies, elem, mbssid->cnt);
+- size += ieee80211_get_mbssid_beacon_len(mbssid);
++ size += ieee80211_get_mbssid_beacon_len(mbssid, mbssid->cnt);
+ } else if (old && old->mbssid_ies) {
+ mbssid = old->mbssid_ies;
+ size += struct_size(new->mbssid_ies, elem, mbssid->cnt);
+- size += ieee80211_get_mbssid_beacon_len(mbssid);
++ size += ieee80211_get_mbssid_beacon_len(mbssid, mbssid->cnt);
+ }
+
+ new = kzalloc(size, GFP_KERNEL);
+@@ -3384,8 +3384,11 @@ cfg80211_beacon_dup(struct cfg80211_beac
+
+ len = beacon->head_len + beacon->tail_len + beacon->beacon_ies_len +
+ beacon->proberesp_ies_len + beacon->assocresp_ies_len +
+- beacon->probe_resp_len + beacon->lci_len + beacon->civicloc_len +
+- ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies);
++ beacon->probe_resp_len + beacon->lci_len + beacon->civicloc_len;
++
++ if (beacon->mbssid_ies)
++ len += ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies,
++ beacon->mbssid_ies->cnt);
+
+ new_beacon = kzalloc(sizeof(*new_beacon) + len, GFP_KERNEL);
+ if (!new_beacon)
+--- a/net/mac80211/ieee80211_i.h
++++ b/net/mac80211/ieee80211_i.h
+@@ -1182,13 +1182,17 @@ ieee80211_vif_get_shift(struct ieee80211
+ }
+
+ static inline int
+-ieee80211_get_mbssid_beacon_len(struct cfg80211_mbssid_elems *elems)
++ieee80211_get_mbssid_beacon_len(struct cfg80211_mbssid_elems *elems, u8 i)
+ {
+- int i, len = 0;
++ int len = 0;
+
+- if (!elems)
++ if (!elems || !elems->cnt || i > elems->cnt)
+ return 0;
+
++ if (i < elems->cnt)
++ return elems->elem[i].len;
++
++ /* i == elems->cnt, calculate total length of all MBSSID elements */
+ for (i = 0; i < elems->cnt; i++)
+ len += elems->elem[i].len;
+
+--- a/net/mac80211/tx.c
++++ b/net/mac80211/tx.c
+@@ -5205,13 +5205,20 @@ ieee80211_beacon_get_finish(struct ieee8
+ }
+
+ static void
+-ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon)
++ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon,
++ u8 i)
+ {
+- int i;
++ if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt ||
++ i > beacon->mbssid_ies->cnt)
++ return;
+
+- if (!beacon->mbssid_ies)
++ if (i < beacon->mbssid_ies->cnt) {
++ skb_put_data(skb, beacon->mbssid_ies->elem[i].data,
++ beacon->mbssid_ies->elem[i].len);
+ return;
++ }
+
++ /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */
+ for (i = 0; i < beacon->mbssid_ies->cnt; i++)
+ skb_put_data(skb, beacon->mbssid_ies->elem[i].data,
+ beacon->mbssid_ies->elem[i].len);
+@@ -5224,7 +5231,8 @@ ieee80211_beacon_get_ap(struct ieee80211
+ struct ieee80211_mutable_offsets *offs,
+ bool is_template,
+ struct beacon_data *beacon,
+- struct ieee80211_chanctx_conf *chanctx_conf)
++ struct ieee80211_chanctx_conf *chanctx_conf,
++ u8 ema_index)
+ {
+ struct ieee80211_local *local = hw_to_local(hw);
+ struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
+@@ -5243,7 +5251,9 @@ ieee80211_beacon_get_ap(struct ieee80211
+ /* headroom, head length,
+ * tail length, maximum TIM length and multiple BSSID length
+ */
+- mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies);
++ mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies,
++ ema_index);
++
+ skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
+ beacon->tail_len + 256 +
+ local->hw.extra_beacon_tailroom + mbssid_len);
+@@ -5261,7 +5271,7 @@ ieee80211_beacon_get_ap(struct ieee80211
+ offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0];
+
+ if (mbssid_len) {
+- ieee80211_beacon_add_mbssid(skb, beacon);
++ ieee80211_beacon_add_mbssid(skb, beacon, ema_index);
+ offs->mbssid_off = skb->len - mbssid_len;
+ }
+
+@@ -5280,12 +5290,51 @@ ieee80211_beacon_get_ap(struct ieee80211
+ return skb;
+ }
+
++static struct ieee80211_ema_beacons *
++ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw,
++ struct ieee80211_vif *vif,
++ struct ieee80211_link_data *link,
++ struct ieee80211_mutable_offsets *offs,
++ bool is_template, struct beacon_data *beacon,
++ struct ieee80211_chanctx_conf *chanctx_conf)
++{
++ struct ieee80211_ema_beacons *ema = NULL;
++
++ if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt)
++ return NULL;
++
++ ema = kzalloc(struct_size(ema, bcn, beacon->mbssid_ies->cnt),
++ GFP_ATOMIC);
++ if (!ema)
++ return NULL;
++
++ for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) {
++ ema->bcn[ema->cnt].skb =
++ ieee80211_beacon_get_ap(hw, vif, link,
++ &ema->bcn[ema->cnt].offs,
++ is_template, beacon,
++ chanctx_conf, ema->cnt);
++ if (!ema->bcn[ema->cnt].skb)
++ break;
++ }
++
++ if (ema->cnt == beacon->mbssid_ies->cnt)
++ return ema;
++
++ ieee80211_beacon_free_ema_list(ema);
++ return NULL;
++}
++
++#define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1
++
+ static struct sk_buff *
+ __ieee80211_beacon_get(struct ieee80211_hw *hw,
+ struct ieee80211_vif *vif,
+ struct ieee80211_mutable_offsets *offs,
+ bool is_template,
+- unsigned int link_id)
++ unsigned int link_id,
++ int ema_index,
++ struct ieee80211_ema_beacons **ema_beacons)
+ {
+ struct ieee80211_local *local = hw_to_local(hw);
+ struct beacon_data *beacon = NULL;
+@@ -5314,8 +5363,29 @@ __ieee80211_beacon_get(struct ieee80211_
+ if (!beacon)
+ goto out;
+
+- skb = ieee80211_beacon_get_ap(hw, vif, link, offs, is_template,
+- beacon, chanctx_conf);
++ if (ema_beacons) {
++ *ema_beacons =
++ ieee80211_beacon_get_ap_ema_list(hw, vif, link,
++ offs,
++ is_template,
++ beacon,
++ chanctx_conf);
++ } else {
++ if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) {
++ if (ema_index >= beacon->mbssid_ies->cnt)
++ goto out; /* End of MBSSID elements */
++
++ if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS)
++ ema_index = beacon->mbssid_ies->cnt;
++ } else {
++ ema_index = 0;
++ }
++
++ skb = ieee80211_beacon_get_ap(hw, vif, link, offs,
++ is_template, beacon,
++ chanctx_conf,
++ ema_index);
++ }
+ } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ struct ieee80211_hdr *hdr;
+@@ -5403,10 +5473,50 @@ ieee80211_beacon_get_template(struct iee
+ struct ieee80211_mutable_offsets *offs,
+ unsigned int link_id)
+ {
+- return __ieee80211_beacon_get(hw, vif, offs, true, link_id);
++ return __ieee80211_beacon_get(hw, vif, offs, true, link_id,
++ IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL);
+ }
+ EXPORT_SYMBOL(ieee80211_beacon_get_template);
+
++struct sk_buff *
++ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw,
++ struct ieee80211_vif *vif,
++ struct ieee80211_mutable_offsets *offs,
++ unsigned int link_id, u8 ema_index)
++{
++ return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index,
++ NULL);
++}
++EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index);
++
++void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons)
++{
++ u8 i;
++
++ if (!ema_beacons)
++ return;
++
++ for (i = 0; i < ema_beacons->cnt; i++)
++ kfree_skb(ema_beacons->bcn[i].skb);
++
++ kfree(ema_beacons);
++}
++EXPORT_SYMBOL(ieee80211_beacon_free_ema_list);
++
++struct ieee80211_ema_beacons *
++ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw,
++ struct ieee80211_vif *vif,
++ unsigned int link_id)
++{
++ struct ieee80211_ema_beacons *ema_beacons = NULL;
++
++ WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, false, link_id, 0,
++ &ema_beacons));
++
++ return ema_beacons;
++}
++EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list);
++
+ struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
+ struct ieee80211_vif *vif,
+ u16 *tim_offset, u16 *tim_length,
+@@ -5414,7 +5524,9 @@ struct sk_buff *ieee80211_beacon_get_tim
+ {
+ struct ieee80211_mutable_offsets offs = {};
+ struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false,
+- link_id);
++ link_id,
++ IEEE80211_INCLUDE_ALL_MBSSID_ELEMS,
++ NULL);
+ struct sk_buff *copy;
+ int shift;
+
projects / openwrt / openwrt.git / commitdiff