cfg80211/mac80211: move information element parsing logic to cfg80211
authorYogesh Ashok Powar <yogeshp@marvell.com>
Wed, 10 Aug 2011 01:02:26 +0000 (18:02 -0700)
committerJohn W. Linville <linville@tuxdriver.com>
Fri, 12 Aug 2011 17:45:03 +0000 (13:45 -0400)
Moving the parsing logic for retrieving the information elements
stored in management frames, e.g. beacons or probe responses,
and making it available to other cfg80211 drivers.

Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
include/net/cfg80211.h
net/mac80211/ieee80211_i.h
net/mac80211/util.c
net/wireless/util.c

index ab1244075925f3e360b8103c1ad12bc68a1bcd9c..de140d428118c87ff7fbfa34ef95c6531623e6af 100644 (file)
@@ -2240,6 +2240,69 @@ extern int ieee80211_radiotap_iterator_next(
 extern const unsigned char rfc1042_header[6];
 extern const unsigned char bridge_tunnel_header[6];
 
+/* Parsed Information Elements */
+struct ieee802_11_elems {
+       u8 *ie_start;
+       size_t total_len;
+
+       /* pointers to IEs */
+       u8 *ssid;
+       u8 *supp_rates;
+       u8 *fh_params;
+       u8 *ds_params;
+       u8 *cf_params;
+       struct ieee80211_tim_ie *tim;
+       u8 *ibss_params;
+       u8 *challenge;
+       u8 *wpa;
+       u8 *rsn;
+       u8 *erp_info;
+       u8 *ext_supp_rates;
+       u8 *wmm_info;
+       u8 *wmm_param;
+       struct ieee80211_ht_cap *ht_cap_elem;
+       struct ieee80211_ht_info *ht_info_elem;
+       struct ieee80211_meshconf_ie *mesh_config;
+       u8 *mesh_id;
+       u8 *peer_link;
+       u8 *preq;
+       u8 *prep;
+       u8 *perr;
+       struct ieee80211_rann_ie *rann;
+       u8 *ch_switch_elem;
+       u8 *country_elem;
+       u8 *pwr_constr_elem;
+       u8 *quiet_elem; /* first quite element */
+       u8 *timeout_int;
+
+       /* length of them, respectively */
+       u8 ssid_len;
+       u8 supp_rates_len;
+       u8 fh_params_len;
+       u8 ds_params_len;
+       u8 cf_params_len;
+       u8 tim_len;
+       u8 ibss_params_len;
+       u8 challenge_len;
+       u8 wpa_len;
+       u8 rsn_len;
+       u8 erp_info_len;
+       u8 ext_supp_rates_len;
+       u8 wmm_info_len;
+       u8 wmm_param_len;
+       u8 mesh_id_len;
+       u8 peer_link_len;
+       u8 preq_len;
+       u8 prep_len;
+       u8 perr_len;
+       u8 ch_switch_elem_len;
+       u8 country_elem_len;
+       u8 pwr_constr_elem_len;
+       u8 quiet_elem_len;
+       u8 num_of_quiet_elem;   /* can be more the one */
+       u8 timeout_int_len;
+};
+
 /**
  * ieee80211_get_hdrlen_from_skb - get header length from data
  *
index 286ac5dbeeeacc7af98f7135b1f730513fb4dabf..ea7419050846b42ea6bf8ef44ac6803281ec9346 100644 (file)
@@ -1021,69 +1021,6 @@ struct ieee80211_ra_tid {
        u16 tid;
 };
 
-/* Parsed Information Elements */
-struct ieee802_11_elems {
-       u8 *ie_start;
-       size_t total_len;
-
-       /* pointers to IEs */
-       u8 *ssid;
-       u8 *supp_rates;
-       u8 *fh_params;
-       u8 *ds_params;
-       u8 *cf_params;
-       struct ieee80211_tim_ie *tim;
-       u8 *ibss_params;
-       u8 *challenge;
-       u8 *wpa;
-       u8 *rsn;
-       u8 *erp_info;
-       u8 *ext_supp_rates;
-       u8 *wmm_info;
-       u8 *wmm_param;
-       struct ieee80211_ht_cap *ht_cap_elem;
-       struct ieee80211_ht_info *ht_info_elem;
-       struct ieee80211_meshconf_ie *mesh_config;
-       u8 *mesh_id;
-       u8 *peer_link;
-       u8 *preq;
-       u8 *prep;
-       u8 *perr;
-       struct ieee80211_rann_ie *rann;
-       u8 *ch_switch_elem;
-       u8 *country_elem;
-       u8 *pwr_constr_elem;
-       u8 *quiet_elem;         /* first quite element */
-       u8 *timeout_int;
-
-       /* length of them, respectively */
-       u8 ssid_len;
-       u8 supp_rates_len;
-       u8 fh_params_len;
-       u8 ds_params_len;
-       u8 cf_params_len;
-       u8 tim_len;
-       u8 ibss_params_len;
-       u8 challenge_len;
-       u8 wpa_len;
-       u8 rsn_len;
-       u8 erp_info_len;
-       u8 ext_supp_rates_len;
-       u8 wmm_info_len;
-       u8 wmm_param_len;
-       u8 mesh_id_len;
-       u8 peer_link_len;
-       u8 preq_len;
-       u8 prep_len;
-       u8 perr_len;
-       u8 ch_switch_elem_len;
-       u8 country_elem_len;
-       u8 pwr_constr_elem_len;
-       u8 quiet_elem_len;
-       u8 num_of_quiet_elem;   /* can be more the one */
-       u8 timeout_int_len;
-};
-
 static inline struct ieee80211_local *hw_to_local(
        struct ieee80211_hw *hw)
 {
index 7a0e351a510e61c4e37c83759f7f0348484bcd72..ce916ff6ef089d54b0e98f31126e054f88b86992 100644 (file)
@@ -19,7 +19,6 @@
 #include <linux/etherdevice.h>
 #include <linux/if_arp.h>
 #include <linux/bitmap.h>
-#include <linux/crc32.h>
 #include <net/net_namespace.h>
 #include <net/cfg80211.h>
 #include <net/rtnetlink.h>
@@ -573,172 +572,6 @@ void ieee802_11_parse_elems(u8 *start, size_t len,
        ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 }
 
-u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
-                              struct ieee802_11_elems *elems,
-                              u64 filter, u32 crc)
-{
-       size_t left = len;
-       u8 *pos = start;
-       bool calc_crc = filter != 0;
-
-       memset(elems, 0, sizeof(*elems));
-       elems->ie_start = start;
-       elems->total_len = len;
-
-       while (left >= 2) {
-               u8 id, elen;
-
-               id = *pos++;
-               elen = *pos++;
-               left -= 2;
-
-               if (elen > left)
-                       break;
-
-               if (calc_crc && id < 64 && (filter & (1ULL << id)))
-                       crc = crc32_be(crc, pos - 2, elen + 2);
-
-               switch (id) {
-               case WLAN_EID_SSID:
-                       elems->ssid = pos;
-                       elems->ssid_len = elen;
-                       break;
-               case WLAN_EID_SUPP_RATES:
-                       elems->supp_rates = pos;
-                       elems->supp_rates_len = elen;
-                       break;
-               case WLAN_EID_FH_PARAMS:
-                       elems->fh_params = pos;
-                       elems->fh_params_len = elen;
-                       break;
-               case WLAN_EID_DS_PARAMS:
-                       elems->ds_params = pos;
-                       elems->ds_params_len = elen;
-                       break;
-               case WLAN_EID_CF_PARAMS:
-                       elems->cf_params = pos;
-                       elems->cf_params_len = elen;
-                       break;
-               case WLAN_EID_TIM:
-                       if (elen >= sizeof(struct ieee80211_tim_ie)) {
-                               elems->tim = (void *)pos;
-                               elems->tim_len = elen;
-                       }
-                       break;
-               case WLAN_EID_IBSS_PARAMS:
-                       elems->ibss_params = pos;
-                       elems->ibss_params_len = elen;
-                       break;
-               case WLAN_EID_CHALLENGE:
-                       elems->challenge = pos;
-                       elems->challenge_len = elen;
-                       break;
-               case WLAN_EID_VENDOR_SPECIFIC:
-                       if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
-                           pos[2] == 0xf2) {
-                               /* Microsoft OUI (00:50:F2) */
-
-                               if (calc_crc)
-                                       crc = crc32_be(crc, pos - 2, elen + 2);
-
-                               if (pos[3] == 1) {
-                                       /* OUI Type 1 - WPA IE */
-                                       elems->wpa = pos;
-                                       elems->wpa_len = elen;
-                               } else if (elen >= 5 && pos[3] == 2) {
-                                       /* OUI Type 2 - WMM IE */
-                                       if (pos[4] == 0) {
-                                               elems->wmm_info = pos;
-                                               elems->wmm_info_len = elen;
-                                       } else if (pos[4] == 1) {
-                                               elems->wmm_param = pos;
-                                               elems->wmm_param_len = elen;
-                                       }
-                               }
-                       }
-                       break;
-               case WLAN_EID_RSN:
-                       elems->rsn = pos;
-                       elems->rsn_len = elen;
-                       break;
-               case WLAN_EID_ERP_INFO:
-                       elems->erp_info = pos;
-                       elems->erp_info_len = elen;
-                       break;
-               case WLAN_EID_EXT_SUPP_RATES:
-                       elems->ext_supp_rates = pos;
-                       elems->ext_supp_rates_len = elen;
-                       break;
-               case WLAN_EID_HT_CAPABILITY:
-                       if (elen >= sizeof(struct ieee80211_ht_cap))
-                               elems->ht_cap_elem = (void *)pos;
-                       break;
-               case WLAN_EID_HT_INFORMATION:
-                       if (elen >= sizeof(struct ieee80211_ht_info))
-                               elems->ht_info_elem = (void *)pos;
-                       break;
-               case WLAN_EID_MESH_ID:
-                       elems->mesh_id = pos;
-                       elems->mesh_id_len = elen;
-                       break;
-               case WLAN_EID_MESH_CONFIG:
-                       if (elen >= sizeof(struct ieee80211_meshconf_ie))
-                               elems->mesh_config = (void *)pos;
-                       break;
-               case WLAN_EID_PEER_LINK:
-                       elems->peer_link = pos;
-                       elems->peer_link_len = elen;
-                       break;
-               case WLAN_EID_PREQ:
-                       elems->preq = pos;
-                       elems->preq_len = elen;
-                       break;
-               case WLAN_EID_PREP:
-                       elems->prep = pos;
-                       elems->prep_len = elen;
-                       break;
-               case WLAN_EID_PERR:
-                       elems->perr = pos;
-                       elems->perr_len = elen;
-                       break;
-               case WLAN_EID_RANN:
-                       if (elen >= sizeof(struct ieee80211_rann_ie))
-                               elems->rann = (void *)pos;
-                       break;
-               case WLAN_EID_CHANNEL_SWITCH:
-                       elems->ch_switch_elem = pos;
-                       elems->ch_switch_elem_len = elen;
-                       break;
-               case WLAN_EID_QUIET:
-                       if (!elems->quiet_elem) {
-                               elems->quiet_elem = pos;
-                               elems->quiet_elem_len = elen;
-                       }
-                       elems->num_of_quiet_elem++;
-                       break;
-               case WLAN_EID_COUNTRY:
-                       elems->country_elem = pos;
-                       elems->country_elem_len = elen;
-                       break;
-               case WLAN_EID_PWR_CONSTRAINT:
-                       elems->pwr_constr_elem = pos;
-                       elems->pwr_constr_elem_len = elen;
-                       break;
-               case WLAN_EID_TIMEOUT_INTERVAL:
-                       elems->timeout_int = pos;
-                       elems->timeout_int_len = elen;
-                       break;
-               default:
-                       break;
-               }
-
-               left -= elen;
-               pos += elen;
-       }
-
-       return crc;
-}
-
 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 {
        struct ieee80211_local *local = sdata->local;
index be75a3a0424eccdf31b895f8cb7e23eddb566a5b..844ddb0aa6533fe3c6071af43b9a43f73e23f461 100644 (file)
@@ -6,6 +6,7 @@
 #include <linux/bitops.h>
 #include <linux/etherdevice.h>
 #include <linux/slab.h>
+#include <linux/crc32.h>
 #include <net/cfg80211.h>
 #include <net/ip.h>
 #include "core.h"
@@ -1044,3 +1045,170 @@ int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
 
        return 0;
 }
+
+u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
+                              struct ieee802_11_elems *elems,
+                              u64 filter, u32 crc)
+{
+       size_t left = len;
+       u8 *pos = start;
+       bool calc_crc = filter != 0;
+
+       memset(elems, 0, sizeof(*elems));
+       elems->ie_start = start;
+       elems->total_len = len;
+
+       while (left >= 2) {
+               u8 id, elen;
+
+               id = *pos++;
+               elen = *pos++;
+               left -= 2;
+
+               if (elen > left)
+                       break;
+
+               if (calc_crc && id < 64 && (filter & (1ULL << id)))
+                       crc = crc32_be(crc, pos - 2, elen + 2);
+
+               switch (id) {
+               case WLAN_EID_SSID:
+                       elems->ssid = pos;
+                       elems->ssid_len = elen;
+                       break;
+               case WLAN_EID_SUPP_RATES:
+                       elems->supp_rates = pos;
+                       elems->supp_rates_len = elen;
+                       break;
+               case WLAN_EID_FH_PARAMS:
+                       elems->fh_params = pos;
+                       elems->fh_params_len = elen;
+                       break;
+               case WLAN_EID_DS_PARAMS:
+                       elems->ds_params = pos;
+                       elems->ds_params_len = elen;
+                       break;
+               case WLAN_EID_CF_PARAMS:
+                       elems->cf_params = pos;
+                       elems->cf_params_len = elen;
+                       break;
+               case WLAN_EID_TIM:
+                       if (elen >= sizeof(struct ieee80211_tim_ie)) {
+                               elems->tim = (void *)pos;
+                               elems->tim_len = elen;
+                       }
+                       break;
+               case WLAN_EID_IBSS_PARAMS:
+                       elems->ibss_params = pos;
+                       elems->ibss_params_len = elen;
+                       break;
+               case WLAN_EID_CHALLENGE:
+                       elems->challenge = pos;
+                       elems->challenge_len = elen;
+                       break;
+               case WLAN_EID_VENDOR_SPECIFIC:
+                       if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
+                           pos[2] == 0xf2) {
+                               /* Microsoft OUI (00:50:F2) */
+
+                               if (calc_crc)
+                                       crc = crc32_be(crc, pos - 2, elen + 2);
+
+                               if (pos[3] == 1) {
+                                       /* OUI Type 1 - WPA IE */
+                                       elems->wpa = pos;
+                                       elems->wpa_len = elen;
+                               } else if (elen >= 5 && pos[3] == 2) {
+                                       /* OUI Type 2 - WMM IE */
+                                       if (pos[4] == 0) {
+                                               elems->wmm_info = pos;
+                                               elems->wmm_info_len = elen;
+                                       } else if (pos[4] == 1) {
+                                               elems->wmm_param = pos;
+                                               elems->wmm_param_len = elen;
+                                       }
+                               }
+                       }
+                       break;
+               case WLAN_EID_RSN:
+                       elems->rsn = pos;
+                       elems->rsn_len = elen;
+                       break;
+               case WLAN_EID_ERP_INFO:
+                       elems->erp_info = pos;
+                       elems->erp_info_len = elen;
+                       break;
+               case WLAN_EID_EXT_SUPP_RATES:
+                       elems->ext_supp_rates = pos;
+                       elems->ext_supp_rates_len = elen;
+                       break;
+               case WLAN_EID_HT_CAPABILITY:
+                       if (elen >= sizeof(struct ieee80211_ht_cap))
+                               elems->ht_cap_elem = (void *)pos;
+                       break;
+               case WLAN_EID_HT_INFORMATION:
+                       if (elen >= sizeof(struct ieee80211_ht_info))
+                               elems->ht_info_elem = (void *)pos;
+                       break;
+               case WLAN_EID_MESH_ID:
+                       elems->mesh_id = pos;
+                       elems->mesh_id_len = elen;
+                       break;
+               case WLAN_EID_MESH_CONFIG:
+                       if (elen >= sizeof(struct ieee80211_meshconf_ie))
+                               elems->mesh_config = (void *)pos;
+                       break;
+               case WLAN_EID_PEER_LINK:
+                       elems->peer_link = pos;
+                       elems->peer_link_len = elen;
+                       break;
+               case WLAN_EID_PREQ:
+                       elems->preq = pos;
+                       elems->preq_len = elen;
+                       break;
+               case WLAN_EID_PREP:
+                       elems->prep = pos;
+                       elems->prep_len = elen;
+                       break;
+               case WLAN_EID_PERR:
+                       elems->perr = pos;
+                       elems->perr_len = elen;
+                       break;
+               case WLAN_EID_RANN:
+                       if (elen >= sizeof(struct ieee80211_rann_ie))
+                               elems->rann = (void *)pos;
+                       break;
+               case WLAN_EID_CHANNEL_SWITCH:
+                       elems->ch_switch_elem = pos;
+                       elems->ch_switch_elem_len = elen;
+                       break;
+               case WLAN_EID_QUIET:
+                       if (!elems->quiet_elem) {
+                               elems->quiet_elem = pos;
+                               elems->quiet_elem_len = elen;
+                       }
+                       elems->num_of_quiet_elem++;
+                       break;
+               case WLAN_EID_COUNTRY:
+                       elems->country_elem = pos;
+                       elems->country_elem_len = elen;
+                       break;
+               case WLAN_EID_PWR_CONSTRAINT:
+                       elems->pwr_constr_elem = pos;
+                       elems->pwr_constr_elem_len = elen;
+                       break;
+               case WLAN_EID_TIMEOUT_INTERVAL:
+                       elems->timeout_int = pos;
+                       elems->timeout_int_len = elen;
+                       break;
+               default:
+                       break;
+               }
+
+               left -= elen;
+               pos += elen;
+       }
+
+       return crc;
+}
+EXPORT_SYMBOL(ieee802_11_parse_elems_crc);