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wifi: cfg80211: refactor RNR parsing
We'll need more parsing of the reduced neighbor report element, and we already have two places doing pretty much the same. Combine by refactoring the parsing into a separate function with a callback for each item found. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Reviewed-by: Benjamin Berg <benjamin.berg@intel.com> Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com> Link: https://msgid.link/20240216135047.cfff14b692fc.Ibe25be88a769eab29ebb17b9d19af666df6a2227@changeid Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg
parent
7e899c1d6f
commit
6b756efcd9
@ -611,104 +611,144 @@ static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry,
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return 0;
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}
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VISIBLE_IF_CFG80211_KUNIT int
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cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies,
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struct list_head *list)
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enum cfg80211_rnr_iter_ret {
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RNR_ITER_CONTINUE,
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RNR_ITER_BREAK,
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RNR_ITER_ERROR,
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};
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static bool
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cfg80211_iter_rnr(const u8 *elems, size_t elems_len,
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enum cfg80211_rnr_iter_ret
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(*iter)(void *data, u8 type,
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const struct ieee80211_neighbor_ap_info *info,
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const u8 *tbtt_info, u8 tbtt_info_len),
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void *iter_data)
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{
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struct ieee80211_neighbor_ap_info *ap_info;
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const struct element *elem, *ssid_elem;
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const struct element *rnr;
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const u8 *pos, *end;
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u32 s_ssid_tmp;
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int n_coloc = 0, ret;
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LIST_HEAD(ap_list);
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ret = cfg80211_calc_short_ssid(ies, &ssid_elem, &s_ssid_tmp);
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if (ret)
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return 0;
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for_each_element_id(rnr, WLAN_EID_REDUCED_NEIGHBOR_REPORT,
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elems, elems_len) {
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const struct ieee80211_neighbor_ap_info *info;
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for_each_element_id(elem, WLAN_EID_REDUCED_NEIGHBOR_REPORT,
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ies->data, ies->len) {
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pos = elem->data;
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end = elem->data + elem->datalen;
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pos = rnr->data;
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end = rnr->data + rnr->datalen;
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/* RNR IE may contain more than one NEIGHBOR_AP_INFO */
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while (pos + sizeof(*ap_info) <= end) {
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enum nl80211_band band;
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int freq;
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while (sizeof(*info) <= end - pos) {
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u8 length, i, count;
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u8 type;
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ap_info = (void *)pos;
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count = u8_get_bits(ap_info->tbtt_info_hdr,
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IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1;
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length = ap_info->tbtt_info_len;
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info = (void *)pos;
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count = u8_get_bits(info->tbtt_info_hdr,
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IEEE80211_AP_INFO_TBTT_HDR_COUNT) +
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1;
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length = info->tbtt_info_len;
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pos += sizeof(*ap_info);
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pos += sizeof(*info);
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if (!ieee80211_operating_class_to_band(ap_info->op_class,
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&band))
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break;
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if (count * length > end - pos)
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return false;
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freq = ieee80211_channel_to_frequency(ap_info->channel,
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band);
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if (end - pos < count * length)
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break;
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if (u8_get_bits(ap_info->tbtt_info_hdr,
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IEEE80211_AP_INFO_TBTT_HDR_TYPE) !=
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IEEE80211_TBTT_INFO_TYPE_TBTT) {
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pos += count * length;
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continue;
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}
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/* TBTT info must include bss param + BSSID +
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* (short SSID or same_ssid bit to be set).
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* ignore other options, and move to the
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* next AP info
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*/
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if (band != NL80211_BAND_6GHZ ||
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!(length == offsetofend(struct ieee80211_tbtt_info_7_8_9,
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bss_params) ||
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length == sizeof(struct ieee80211_tbtt_info_7_8_9) ||
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length >= offsetofend(struct ieee80211_tbtt_info_ge_11,
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bss_params))) {
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pos += count * length;
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continue;
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}
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type = u8_get_bits(info->tbtt_info_hdr,
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IEEE80211_AP_INFO_TBTT_HDR_TYPE);
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for (i = 0; i < count; i++) {
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struct cfg80211_colocated_ap *entry;
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entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN,
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GFP_ATOMIC);
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if (!entry)
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goto error;
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entry->center_freq = freq;
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if (!cfg80211_parse_ap_info(entry, pos, length,
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ssid_elem,
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s_ssid_tmp)) {
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n_coloc++;
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list_add_tail(&entry->list, &ap_list);
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} else {
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kfree(entry);
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switch (iter(iter_data, type, info,
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pos, length)) {
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case RNR_ITER_CONTINUE:
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break;
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case RNR_ITER_BREAK:
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return true;
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case RNR_ITER_ERROR:
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return false;
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}
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pos += length;
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}
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}
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error:
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if (pos != end) {
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cfg80211_free_coloc_ap_list(&ap_list);
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return 0;
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}
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if (pos != end)
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return false;
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}
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list_splice_tail(&ap_list, list);
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return n_coloc;
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return true;
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}
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struct colocated_ap_data {
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const struct element *ssid_elem;
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struct list_head ap_list;
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u32 s_ssid_tmp;
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int n_coloc;
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};
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static enum cfg80211_rnr_iter_ret
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cfg80211_parse_colocated_ap_iter(void *_data, u8 type,
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const struct ieee80211_neighbor_ap_info *info,
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const u8 *tbtt_info, u8 tbtt_info_len)
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{
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struct colocated_ap_data *data = _data;
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struct cfg80211_colocated_ap *entry;
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enum nl80211_band band;
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if (type != IEEE80211_TBTT_INFO_TYPE_TBTT)
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return RNR_ITER_CONTINUE;
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if (!ieee80211_operating_class_to_band(info->op_class, &band))
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return RNR_ITER_CONTINUE;
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/* TBTT info must include bss param + BSSID + (short SSID or
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* same_ssid bit to be set). Ignore other options, and move to
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* the next AP info
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*/
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if (band != NL80211_BAND_6GHZ ||
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!(tbtt_info_len == offsetofend(struct ieee80211_tbtt_info_7_8_9,
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bss_params) ||
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tbtt_info_len == sizeof(struct ieee80211_tbtt_info_7_8_9) ||
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tbtt_info_len >= offsetofend(struct ieee80211_tbtt_info_ge_11,
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bss_params)))
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return RNR_ITER_CONTINUE;
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entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN, GFP_ATOMIC);
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if (!entry)
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return RNR_ITER_ERROR;
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entry->center_freq =
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ieee80211_channel_to_frequency(info->channel, band);
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if (!cfg80211_parse_ap_info(entry, tbtt_info, tbtt_info_len,
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data->ssid_elem, data->s_ssid_tmp)) {
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data->n_coloc++;
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list_add_tail(&entry->list, &data->ap_list);
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} else {
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kfree(entry);
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}
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return RNR_ITER_CONTINUE;
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}
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VISIBLE_IF_CFG80211_KUNIT int
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cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies,
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struct list_head *list)
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{
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struct colocated_ap_data data = {};
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int ret;
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INIT_LIST_HEAD(&data.ap_list);
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ret = cfg80211_calc_short_ssid(ies, &data.ssid_elem, &data.s_ssid_tmp);
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if (ret)
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return 0;
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if (!cfg80211_iter_rnr(ies->data, ies->len,
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cfg80211_parse_colocated_ap_iter, &data)) {
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cfg80211_free_coloc_ap_list(&data.ap_list);
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return 0;
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}
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list_splice_tail(&data.ap_list, list);
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return data.n_coloc;
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}
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EXPORT_SYMBOL_IF_CFG80211_KUNIT(cfg80211_parse_colocated_ap);
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@ -2607,79 +2647,71 @@ error:
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return NULL;
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}
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struct tbtt_info_iter_data {
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const struct ieee80211_neighbor_ap_info *ap_info;
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u8 param_ch_count;
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u32 use_for;
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u8 mld_id, link_id;
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};
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static enum cfg80211_rnr_iter_ret
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cfg802121_mld_ap_rnr_iter(void *_data, u8 type,
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const struct ieee80211_neighbor_ap_info *info,
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const u8 *tbtt_info, u8 tbtt_info_len)
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{
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const struct ieee80211_rnr_mld_params *mld_params;
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struct tbtt_info_iter_data *data = _data;
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u8 link_id;
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if (type == IEEE80211_TBTT_INFO_TYPE_TBTT &&
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tbtt_info_len >= offsetofend(struct ieee80211_tbtt_info_ge_11,
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mld_params))
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mld_params = (void *)(tbtt_info +
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offsetof(struct ieee80211_tbtt_info_ge_11,
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mld_params));
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else if (type == IEEE80211_TBTT_INFO_TYPE_MLD &&
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tbtt_info_len >= sizeof(struct ieee80211_rnr_mld_params))
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mld_params = (void *)tbtt_info;
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else
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return RNR_ITER_CONTINUE;
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link_id = le16_get_bits(mld_params->params,
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IEEE80211_RNR_MLD_PARAMS_LINK_ID);
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if (data->mld_id != mld_params->mld_id)
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return RNR_ITER_CONTINUE;
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if (data->link_id != link_id)
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return RNR_ITER_CONTINUE;
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data->ap_info = info;
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data->param_ch_count =
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le16_get_bits(mld_params->params,
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IEEE80211_RNR_MLD_PARAMS_BSS_CHANGE_COUNT);
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if (type == IEEE80211_TBTT_INFO_TYPE_TBTT)
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data->use_for = NL80211_BSS_USE_FOR_ALL;
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else
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data->use_for = NL80211_BSS_USE_FOR_MLD_LINK;
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return RNR_ITER_BREAK;
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}
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static u8
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cfg80211_rnr_info_for_mld_ap(const u8 *ie, size_t ielen, u8 mld_id, u8 link_id,
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const struct ieee80211_neighbor_ap_info **ap_info,
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u8 *param_ch_count)
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{
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const struct ieee80211_neighbor_ap_info *info;
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const struct element *rnr;
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const u8 *pos, *end;
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struct tbtt_info_iter_data data = {
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.mld_id = mld_id,
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.link_id = link_id,
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};
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for_each_element_id(rnr, WLAN_EID_REDUCED_NEIGHBOR_REPORT, ie, ielen) {
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pos = rnr->data;
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end = rnr->data + rnr->datalen;
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cfg80211_iter_rnr(ie, ielen, cfg802121_mld_ap_rnr_iter, &data);
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/* RNR IE may contain more than one NEIGHBOR_AP_INFO */
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while (sizeof(*info) <= end - pos) {
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const struct ieee80211_rnr_mld_params *mld_params;
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u16 params;
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u8 length, i, count, mld_params_offset;
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u8 type, lid;
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u32 use_for;
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*ap_info = data.ap_info;
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*param_ch_count = data.param_ch_count;
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info = (void *)pos;
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count = u8_get_bits(info->tbtt_info_hdr,
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IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1;
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length = info->tbtt_info_len;
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pos += sizeof(*info);
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if (count * length > end - pos)
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return 0;
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type = u8_get_bits(info->tbtt_info_hdr,
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IEEE80211_AP_INFO_TBTT_HDR_TYPE);
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if (type == IEEE80211_TBTT_INFO_TYPE_TBTT &&
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length >=
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offsetofend(struct ieee80211_tbtt_info_ge_11,
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mld_params)) {
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mld_params_offset =
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offsetof(struct ieee80211_tbtt_info_ge_11, mld_params);
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use_for = NL80211_BSS_USE_FOR_ALL;
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} else if (type == IEEE80211_TBTT_INFO_TYPE_MLD &&
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length >= sizeof(struct ieee80211_rnr_mld_params)) {
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mld_params_offset = 0;
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use_for = NL80211_BSS_USE_FOR_MLD_LINK;
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} else {
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pos += count * length;
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continue;
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}
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for (i = 0; i < count; i++) {
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mld_params = (void *)pos + mld_params_offset;
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params = le16_to_cpu(mld_params->params);
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lid = u16_get_bits(params,
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IEEE80211_RNR_MLD_PARAMS_LINK_ID);
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if (mld_id == mld_params->mld_id &&
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link_id == lid) {
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*ap_info = info;
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*param_ch_count =
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le16_get_bits(mld_params->params,
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IEEE80211_RNR_MLD_PARAMS_BSS_CHANGE_COUNT);
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return use_for;
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}
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pos += length;
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}
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}
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}
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return 0;
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return data.use_for;
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}
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static struct element *
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