diff options
Diffstat (limited to 'net/mac80211/util.c')
| -rw-r--r-- | net/mac80211/util.c | 137 |
1 files changed, 112 insertions, 25 deletions
diff --git a/net/mac80211/util.c b/net/mac80211/util.c index ba950ae974fc..4c1655972565 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -891,33 +891,24 @@ void ieee80211_queue_delayed_work(struct ieee80211_hw *hw, } EXPORT_SYMBOL(ieee80211_queue_delayed_work); -u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action, - struct ieee802_11_elems *elems, - u64 filter, u32 crc) +static u32 +_ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action, + struct ieee802_11_elems *elems, + u64 filter, u32 crc, u8 *transmitter_bssid, + u8 *bss_bssid) { - size_t left = len; - const u8 *pos = start; + const struct element *elem, *sub; bool calc_crc = filter != 0; DECLARE_BITMAP(seen_elems, 256); const u8 *ie; bitmap_zero(seen_elems, 256); - memset(elems, 0, sizeof(*elems)); - elems->ie_start = start; - elems->total_len = len; - while (left >= 2) { - u8 id, elen; + for_each_element(elem, start, len) { bool elem_parse_failed; - - id = *pos++; - elen = *pos++; - left -= 2; - - if (elen > left) { - elems->parse_error = true; - break; - } + u8 id = elem->id; + u8 elen = elem->datalen; + const u8 *pos = elem->data; switch (id) { case WLAN_EID_SSID: @@ -960,8 +951,6 @@ u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action, */ if (test_bit(id, seen_elems)) { elems->parse_error = true; - left -= elen; - pos += elen; continue; } break; @@ -1219,6 +1208,57 @@ u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action, if (elen >= sizeof(*elems->max_idle_period_ie)) elems->max_idle_period_ie = (void *)pos; break; + case WLAN_EID_MULTIPLE_BSSID: + if (!bss_bssid || !transmitter_bssid || elen < 4) + break; + + elems->max_bssid_indicator = pos[0]; + + for_each_element(sub, pos + 1, elen - 1) { + u8 sub_len = sub->datalen; + u8 new_bssid[ETH_ALEN]; + const u8 *index; + + /* + * we only expect the "non-transmitted BSSID + * profile" subelement (subelement id 0) + */ + if (sub->id != 0 || sub->datalen < 4) { + /* not a valid BSS profile */ + continue; + } + + if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP || + sub->data[1] != 2) { + /* The first element of the + * Nontransmitted BSSID Profile is not + * the Nontransmitted BSSID Capability + * element. + */ + continue; + } + + /* found a Nontransmitted BSSID Profile */ + index = cfg80211_find_ie(WLAN_EID_MULTI_BSSID_IDX, + sub->data, sub_len); + if (!index || index[1] < 1 || index[2] == 0) { + /* Invalid MBSSID Index element */ + continue; + } + + cfg80211_gen_new_bssid(transmitter_bssid, + pos[0], + index[2], + new_bssid); + if (ether_addr_equal(new_bssid, bss_bssid)) { + elems->nontransmitted_bssid_profile = + (void *)sub; + elems->bssid_index_len = index[1]; + elems->bssid_index = (void *)&index[2]; + break; + } + } + break; case WLAN_EID_EXTENSION: if (pos[0] == WLAN_EID_EXT_HE_MU_EDCA && elen >= (sizeof(*elems->mu_edca_param_set) + 1)) { @@ -1234,6 +1274,14 @@ u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action, elems->he_operation = (void *)&pos[1]; } else if (pos[0] == WLAN_EID_EXT_UORA && elen >= 1) { elems->uora_element = (void *)&pos[1]; + } else if (pos[0] == + WLAN_EID_EXT_MAX_CHANNEL_SWITCH_TIME && + elen == 4) { + elems->max_channel_switch_time = pos + 1; + } else if (pos[0] == + WLAN_EID_EXT_MULTIPLE_BSSID_CONFIGURATION && + elen == 3) { + elems->mbssid_config_ie = (void *)&pos[1]; } break; default: @@ -1244,17 +1292,56 @@ u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action, elems->parse_error = true; else __set_bit(id, seen_elems); - - left -= elen; - pos += elen; } - if (left != 0) + if (!for_each_element_completed(elem, start, len)) elems->parse_error = true; return crc; } +u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action, + struct ieee802_11_elems *elems, + u64 filter, u32 crc, u8 *transmitter_bssid, + u8 *bss_bssid) +{ + memset(elems, 0, sizeof(*elems)); + elems->ie_start = start; + elems->total_len = len; + + crc = _ieee802_11_parse_elems_crc(start, len, action, elems, filter, + crc, transmitter_bssid, bss_bssid); + + /* Override with nontransmitted profile, if found */ + if (transmitter_bssid && elems->nontransmitted_bssid_profile) { + const u8 *profile = elems->nontransmitted_bssid_profile; + + _ieee802_11_parse_elems_crc(&profile[2], profile[1], + action, elems, 0, 0, + transmitter_bssid, bss_bssid); + } + + if (elems->tim && !elems->parse_error) { + const struct ieee80211_tim_ie *tim_ie = elems->tim; + + elems->dtim_period = tim_ie->dtim_period; + elems->dtim_count = tim_ie->dtim_count; + } + + /* Override DTIM period and count if needed */ + if (elems->bssid_index && + elems->bssid_index_len >= + offsetofend(struct ieee80211_bssid_index, dtim_period)) + elems->dtim_period = elems->bssid_index->dtim_period; + + if (elems->bssid_index && + elems->bssid_index_len >= + offsetofend(struct ieee80211_bssid_index, dtim_count)) + elems->dtim_count = elems->bssid_index->dtim_count; + + return crc; +} + void ieee80211_regulatory_limit_wmm_params(struct ieee80211_sub_if_data *sdata, struct ieee80211_tx_queue_params *qparam, int ac) |