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author | Sara Sharon <sara.sharon@intel.com> | 2019-03-15 17:39:04 +0200 |
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committer | Johannes Berg <johannes.berg@intel.com> | 2019-04-26 13:02:11 +0200 |
commit | 671042a4fb77e0a0c2db595fd8e5ef5f7ba75bbe (patch) | |
tree | 8e34b0a9a37bc0b731714bfa196f0085d2109937 /net/mac80211/util.c | |
parent | f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3 (diff) | |
download | linux-stable-671042a4fb77e0a0c2db595fd8e5ef5f7ba75bbe.tar.gz linux-stable-671042a4fb77e0a0c2db595fd8e5ef5f7ba75bbe.tar.bz2 linux-stable-671042a4fb77e0a0c2db595fd8e5ef5f7ba75bbe.zip |
mac80211: support non-inheritance element
Subelement profile may specify element IDs it doesn't inherit
from the management frame. Support it.
Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/util.c')
-rw-r--r-- | net/mac80211/util.c | 134 |
1 files changed, 77 insertions, 57 deletions
diff --git a/net/mac80211/util.c b/net/mac80211/util.c index 4c1655972565..08197afdb7b3 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -894,10 +894,10 @@ EXPORT_SYMBOL(ieee80211_queue_delayed_work); 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) + u64 filter, u32 crc, + const struct element *check_inherit) { - const struct element *elem, *sub; + const struct element *elem; bool calc_crc = filter != 0; DECLARE_BITMAP(seen_elems, 256); const u8 *ie; @@ -910,6 +910,11 @@ _ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action, u8 elen = elem->datalen; const u8 *pos = elem->data; + if (check_inherit && + !cfg80211_is_element_inherited(elem, + check_inherit)) + continue; + switch (id) { case WLAN_EID_SSID: case WLAN_EID_SUPP_RATES: @@ -1208,57 +1213,6 @@ _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)) { @@ -1300,25 +1254,91 @@ _ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action, return crc; } +static void ieee802_11_find_bssid_profile(const u8 *start, size_t len, + struct ieee802_11_elems *elems, + u8 *transmitter_bssid, + u8 *bss_bssid) +{ + const struct element *elem, *sub; + + if (!bss_bssid || !transmitter_bssid) + return; + + for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, start, len) { + if (elem->datalen < 2) + continue; + + for_each_element(sub, elem->data + 1, elem->datalen - 1) { + u8 new_bssid[ETH_ALEN]; + const u8 *index; + + 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->datalen); + if (!index || index[1] < 1 || index[2] == 0) { + /* Invalid MBSSID Index element */ + continue; + } + + cfg80211_gen_new_bssid(transmitter_bssid, + elem->data[0], + index[2], + new_bssid); + if (ether_addr_equal(new_bssid, bss_bssid)) { + elems->nontransmitted_bssid_profile = + elem->data; + elems->bssid_index_len = index[1]; + elems->bssid_index = (void *)&index[2]; + break; + } + } + } +} + 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) { + const struct element *non_inherit = NULL; + memset(elems, 0, sizeof(*elems)); elems->ie_start = start; elems->total_len = len; + ieee802_11_find_bssid_profile(start, len, elems, transmitter_bssid, + bss_bssid); + + if (elems->nontransmitted_bssid_profile) + non_inherit = + cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE, + &elems->nontransmitted_bssid_profile[2], + elems->nontransmitted_bssid_profile[1]); + crc = _ieee802_11_parse_elems_crc(start, len, action, elems, filter, - crc, transmitter_bssid, bss_bssid); + crc, non_inherit); /* 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); + action, elems, 0, 0, NULL); } if (elems->tim && !elems->parse_error) { |