--- /dev/null
+/*
+ * WPA Supplicant - Basic mesh peer management
+ * Copyright (c) 2013-2014, cozybit, Inc. All rights reserved.
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "utils/includes.h"
+
+#include "utils/common.h"
+#include "utils/eloop.h"
+#include "common/ieee802_11_defs.h"
+#include "ap/hostapd.h"
+#include "ap/sta_info.h"
+#include "ap/ieee802_11.h"
+#include "wpa_supplicant_i.h"
+#include "driver_i.h"
+#include "mesh_mpm.h"
+
+/* TODO make configurable */
+#define dot11MeshMaxRetries 10
+#define dot11MeshRetryTimeout 1
+#define dot11MeshConfirmTimeout 1
+#define dot11MeshHoldingTimeout 1
+
+struct mesh_peer_mgmt_ie {
+ const u8 *proto_id;
+ const u8 *llid;
+ const u8 *plid;
+ const u8 *reason;
+ const u8 *pmk;
+};
+
+static void plink_timer(void *eloop_ctx, void *user_data);
+
+
+enum plink_event {
+ PLINK_UNDEFINED,
+ OPN_ACPT,
+ OPN_RJCT,
+ OPN_IGNR,
+ CNF_ACPT,
+ CNF_RJCT,
+ CNF_IGNR,
+ CLS_ACPT,
+ CLS_IGNR
+};
+
+static const char * const mplstate[] = {
+ [PLINK_LISTEN] = "LISTEN",
+ [PLINK_OPEN_SENT] = "OPEN_SENT",
+ [PLINK_OPEN_RCVD] = "OPEN_RCVD",
+ [PLINK_CNF_RCVD] = "CNF_RCVD",
+ [PLINK_ESTAB] = "ESTAB",
+ [PLINK_HOLDING] = "HOLDING",
+ [PLINK_BLOCKED] = "BLOCKED"
+};
+
+static const char * const mplevent[] = {
+ [PLINK_UNDEFINED] = "UNDEFINED",
+ [OPN_ACPT] = "OPN_ACPT",
+ [OPN_RJCT] = "OPN_RJCT",
+ [OPN_IGNR] = "OPN_IGNR",
+ [CNF_ACPT] = "CNF_ACPT",
+ [CNF_RJCT] = "CNF_RJCT",
+ [CNF_IGNR] = "CNF_IGNR",
+ [CLS_ACPT] = "CLS_ACPT",
+ [CLS_IGNR] = "CLS_IGNR"
+};
+
+
+static int mesh_mpm_parse_peer_mgmt(struct wpa_supplicant *wpa_s,
+ u8 action_field,
+ const u8 *ie, size_t len,
+ struct mesh_peer_mgmt_ie *mpm_ie)
+{
+ os_memset(mpm_ie, 0, sizeof(*mpm_ie));
+
+ /* remove optional PMK at end */
+ if (len >= 16) {
+ len -= 16;
+ mpm_ie->pmk = ie + len - 16;
+ }
+
+ if ((action_field == PLINK_OPEN && len != 4) ||
+ (action_field == PLINK_CONFIRM && len != 6) ||
+ (action_field == PLINK_CLOSE && len != 6 && len != 8)) {
+ wpa_msg(wpa_s, MSG_DEBUG, "MPM: Invalid peer mgmt ie");
+ return -1;
+ }
+
+ /* required fields */
+ if (len < 4)
+ return -1;
+ mpm_ie->proto_id = ie;
+ mpm_ie->llid = ie + 2;
+ ie += 4;
+ len -= 4;
+
+ /* close reason is always present at end for close */
+ if (action_field == PLINK_CLOSE) {
+ if (len < 2)
+ return -1;
+ mpm_ie->reason = ie + len - 2;
+ len -= 2;
+ }
+
+ /* plid, present for confirm, and possibly close */
+ if (len)
+ mpm_ie->plid = ie;
+
+ return 0;
+}
+
+
+static int plink_free_count(struct hostapd_data *hapd)
+{
+ if (hapd->max_plinks > hapd->num_plinks)
+ return hapd->max_plinks - hapd->num_plinks;
+ return 0;
+}
+
+
+static u16 copy_supp_rates(struct wpa_supplicant *wpa_s,
+ struct sta_info *sta,
+ struct ieee802_11_elems *elems)
+{
+ if (!elems->supp_rates) {
+ wpa_msg(wpa_s, MSG_ERROR, "no supported rates from " MACSTR,
+ MAC2STR(sta->addr));
+ return WLAN_STATUS_UNSPECIFIED_FAILURE;
+ }
+
+ if (elems->supp_rates_len + elems->ext_supp_rates_len >
+ sizeof(sta->supported_rates)) {
+ wpa_msg(wpa_s, MSG_ERROR,
+ "Invalid supported rates element length " MACSTR
+ " %d+%d", MAC2STR(sta->addr), elems->supp_rates_len,
+ elems->ext_supp_rates_len);
+ return WLAN_STATUS_UNSPECIFIED_FAILURE;
+ }
+
+ sta->supported_rates_len = merge_byte_arrays(
+ sta->supported_rates, sizeof(sta->supported_rates),
+ elems->supp_rates, elems->supp_rates_len,
+ elems->ext_supp_rates, elems->ext_supp_rates_len);
+
+ return WLAN_STATUS_SUCCESS;
+}
+
+
+/* return true if elems from a neighbor match this MBSS */
+static Boolean matches_local(struct wpa_supplicant *wpa_s,
+ struct ieee802_11_elems *elems)
+{
+ struct mesh_conf *mconf = wpa_s->ifmsh->mconf;
+
+ if (elems->mesh_config_len < 5)
+ return FALSE;
+
+ return (mconf->meshid_len == elems->mesh_id_len &&
+ os_memcmp(mconf->meshid, elems->mesh_id,
+ elems->mesh_id_len) == 0 &&
+ mconf->mesh_pp_id == elems->mesh_config[0] &&
+ mconf->mesh_pm_id == elems->mesh_config[1] &&
+ mconf->mesh_cc_id == elems->mesh_config[2] &&
+ mconf->mesh_sp_id == elems->mesh_config[3] &&
+ mconf->mesh_auth_id == elems->mesh_config[4]);
+}
+
+
+/* check if local link id is already used with another peer */
+static Boolean llid_in_use(struct wpa_supplicant *wpa_s, u16 llid)
+{
+ struct sta_info *sta;
+ struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
+
+ for (sta = hapd->sta_list; sta; sta = sta->next) {
+ if (sta->my_lid == llid)
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+
+/* generate an llid for a link and set to initial state */
+static void mesh_mpm_init_link(struct wpa_supplicant *wpa_s,
+ struct sta_info *sta)
+{
+ u16 llid;
+
+ do {
+ if (os_get_random((u8 *) &llid, sizeof(llid)) < 0)
+ continue;
+ } while (!llid || llid_in_use(wpa_s, llid));
+
+ sta->my_lid = llid;
+ sta->peer_lid = 0;
+ sta->plink_state = PLINK_LISTEN;
+}
+
+
+static void mesh_mpm_send_plink_action(struct wpa_supplicant *wpa_s,
+ struct sta_info *sta,
+ enum plink_action_field type,
+ u16 close_reason)
+{
+ struct wpabuf *buf;
+ struct hostapd_iface *ifmsh = wpa_s->ifmsh;
+ struct hostapd_data *bss = ifmsh->bss[0];
+ struct mesh_conf *conf = ifmsh->mconf;
+ u8 supp_rates[2 + 2 + 32];
+ u8 *pos;
+ u8 ie_len, add_plid = 0;
+ int ret;
+ int ampe = conf->security & MESH_CONF_SEC_AMPE;
+
+ if (!sta)
+ return;
+
+ buf = wpabuf_alloc(2 + /* capability info */
+ 2 + /* AID */
+ 2 + 8 + /* supported rates */
+ 2 + (32 - 8) +
+ 2 + 32 + /* mesh ID */
+ 2 + 7 + /* mesh config */
+ 2 + 26 + /* HT capabilities */
+ 2 + 22 + /* HT operation */
+ 2 + 23 + /* peering management */
+ 2 + 96 + /* AMPE */
+ 2 + 16); /* MIC */
+ if (!buf)
+ return;
+
+ wpabuf_put_u8(buf, WLAN_ACTION_SELF_PROTECTED);
+ wpabuf_put_u8(buf, type);
+
+ if (type != PLINK_CLOSE) {
+ /* capability info */
+ wpabuf_put_le16(buf, ampe ? IEEE80211_CAP_PRIVACY : 0);
+
+ if (type == PLINK_CONFIRM)
+ wpabuf_put_le16(buf, sta->peer_lid);
+
+ /* IE: supp + ext. supp rates */
+ pos = hostapd_eid_supp_rates(bss, supp_rates);
+ pos = hostapd_eid_ext_supp_rates(bss, pos);
+ wpabuf_put_data(buf, supp_rates, pos - supp_rates);
+
+ /* IE: Mesh ID */
+ wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
+ wpabuf_put_u8(buf, conf->meshid_len);
+ wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
+
+ /* IE: mesh conf */
+ wpabuf_put_u8(buf, WLAN_EID_MESH_CONFIG);
+ wpabuf_put_u8(buf, 7);
+ wpabuf_put_u8(buf, conf->mesh_pp_id);
+ wpabuf_put_u8(buf, conf->mesh_pm_id);
+ wpabuf_put_u8(buf, conf->mesh_cc_id);
+ wpabuf_put_u8(buf, conf->mesh_sp_id);
+ wpabuf_put_u8(buf, conf->mesh_auth_id);
+ /* TODO: formation info */
+ wpabuf_put_u8(buf, 0);
+ /* always forwarding & accepting plinks for now */
+ wpabuf_put_u8(buf, 0x1 | 0x8);
+ } else { /* Peer closing frame */
+ /* IE: Mesh ID */
+ wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
+ wpabuf_put_u8(buf, conf->meshid_len);
+ wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
+ }
+
+ /* IE: Mesh Peering Management element */
+ ie_len = 4;
+ if (ampe)
+ ie_len += PMKID_LEN;
+ switch (type) {
+ case PLINK_OPEN:
+ break;
+ case PLINK_CONFIRM:
+ ie_len += 2;
+ add_plid = 1;
+ break;
+ case PLINK_CLOSE:
+ ie_len += 2;
+ add_plid = 1;
+ ie_len += 2; /* reason code */
+ break;
+ }
+
+ wpabuf_put_u8(buf, WLAN_EID_PEER_MGMT);
+ wpabuf_put_u8(buf, ie_len);
+ /* peering protocol */
+ if (ampe)
+ wpabuf_put_le16(buf, 1);
+ else
+ wpabuf_put_le16(buf, 0);
+ wpabuf_put_le16(buf, sta->my_lid);
+ if (add_plid)
+ wpabuf_put_le16(buf, sta->peer_lid);
+ if (type == PLINK_CLOSE)
+ wpabuf_put_le16(buf, close_reason);
+
+ /* TODO HT IEs */
+
+ ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0,
+ sta->addr, wpa_s->own_addr, wpa_s->own_addr,
+ wpabuf_head(buf), wpabuf_len(buf), 0);
+ if (ret < 0)
+ wpa_msg(wpa_s, MSG_INFO,
+ "Mesh MPM: failed to send peering frame");
+
+ wpabuf_free(buf);
+}
+
+
+/* configure peering state in ours and driver's station entry */
+static void
+wpa_mesh_set_plink_state(struct wpa_supplicant *wpa_s, struct sta_info *sta,
+ enum mesh_plink_state state)
+{
+ struct hostapd_sta_add_params params;
+ int ret;
+
+ sta->plink_state = state;
+
+ os_memset(¶ms, 0, sizeof(params));
+ params.addr = sta->addr;
+ params.plink_state = state;
+ params.set = 1;
+
+ wpa_msg(wpa_s, MSG_DEBUG, "MPM set " MACSTR " into %s",
+ MAC2STR(sta->addr), mplstate[state]);
+ ret = wpa_drv_sta_add(wpa_s, ¶ms);
+ if (ret) {
+ wpa_msg(wpa_s, MSG_ERROR, "Driver failed to set " MACSTR
+ ": %d", MAC2STR(sta->addr), ret);
+ }
+}
+
+
+static void mesh_mpm_fsm_restart(struct wpa_supplicant *wpa_s,
+ struct sta_info *sta)
+{
+ struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
+
+ eloop_cancel_timeout(plink_timer, wpa_s, sta);
+
+ if (sta->mpm_close_reason == WLAN_REASON_MESH_CLOSE_RCVD) {
+ ap_free_sta(hapd, sta);
+ return;
+ }
+
+ wpa_mesh_set_plink_state(wpa_s, sta, PLINK_LISTEN);
+ sta->my_lid = sta->peer_lid = sta->mpm_close_reason = 0;
+ sta->mpm_retries = 0;
+}
+
+
+static void plink_timer(void *eloop_ctx, void *user_data)
+{
+ struct wpa_supplicant *wpa_s = eloop_ctx;
+ struct sta_info *sta = user_data;
+ u16 reason = 0;
+
+ switch (sta->plink_state) {
+ case PLINK_OPEN_RCVD:
+ case PLINK_OPEN_SENT:
+ /* retry timer */
+ if (sta->mpm_retries < dot11MeshMaxRetries) {
+ eloop_register_timeout(dot11MeshRetryTimeout, 0,
+ plink_timer, wpa_s, sta);
+ mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
+ sta->mpm_retries++;
+ break;
+ }
+ reason = WLAN_REASON_MESH_MAX_RETRIES;
+ /* fall through on else */
+
+ case PLINK_CNF_RCVD:
+ /* confirm timer */
+ if (!reason)
+ reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
+ sta->plink_state = PLINK_HOLDING;
+ eloop_register_timeout(dot11MeshHoldingTimeout, 0,
+ plink_timer, wpa_s, sta);
+ mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
+ break;
+ case PLINK_HOLDING:
+ /* holding timer */
+ mesh_mpm_fsm_restart(wpa_s, sta);
+ break;
+ default:
+ break;
+ }
+}
+
+
+/* initiate peering with station */
+static void
+mesh_mpm_plink_open(struct wpa_supplicant *wpa_s, struct sta_info *sta,
+ enum mesh_plink_state next_state)
+{
+ eloop_cancel_timeout(plink_timer, wpa_s, sta);
+ eloop_register_timeout(dot11MeshRetryTimeout, 0, plink_timer,
+ wpa_s, sta);
+ mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
+ wpa_mesh_set_plink_state(wpa_s, sta, next_state);
+}
+
+
+int mesh_mpm_plink_close(struct hostapd_data *hapd,
+ struct sta_info *sta, void *ctx)
+{
+ struct wpa_supplicant *wpa_s = ctx;
+ int reason = WLAN_REASON_MESH_PEERING_CANCELLED;
+
+ if (sta) {
+ wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
+ mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
+ wpa_printf(MSG_DEBUG, "MPM closing plink sta=" MACSTR,
+ MAC2STR(sta->addr));
+ eloop_cancel_timeout(plink_timer, wpa_s, sta);
+ return 0;
+ }
+
+ return 1;
+}
+
+
+void mesh_mpm_deinit(struct wpa_supplicant *wpa_s, struct hostapd_iface *ifmsh)
+{
+ struct hostapd_data *hapd = ifmsh->bss[0];
+
+ /* notify peers we're leaving */
+ ap_for_each_sta(hapd, mesh_mpm_plink_close, wpa_s);
+
+ hapd->num_plinks = 0;
+ hostapd_free_stas(hapd);
+}
+
+
+/* for mesh_rsn to indicate this peer has completed authentication, and we're
+ * ready to start AMPE */
+void mesh_mpm_auth_peer(struct wpa_supplicant *wpa_s, const u8 *addr)
+{
+ struct hostapd_data *data = wpa_s->ifmsh->bss[0];
+ struct hostapd_sta_add_params params;
+ struct sta_info *sta;
+ int ret;
+
+ sta = ap_get_sta(data, addr);
+ if (!sta) {
+ wpa_msg(wpa_s, MSG_DEBUG, "no such mesh peer");
+ return;
+ }
+
+ /* TODO: Should do nothing if this STA is already authenticated, but
+ * the AP code already sets this flag. */
+ sta->flags |= WLAN_STA_AUTH;
+
+ os_memset(¶ms, 0, sizeof(params));
+ params.addr = sta->addr;
+ params.flags = WPA_STA_AUTHENTICATED | WPA_STA_AUTHORIZED;
+ params.set = 1;
+
+ wpa_msg(wpa_s, MSG_DEBUG, "MPM authenticating " MACSTR,
+ MAC2STR(sta->addr));
+ ret = wpa_drv_sta_add(wpa_s, ¶ms);
+ if (ret) {
+ wpa_msg(wpa_s, MSG_ERROR,
+ "Driver failed to set " MACSTR ": %d",
+ MAC2STR(sta->addr), ret);
+ }
+
+ if (!sta->my_lid)
+ mesh_mpm_init_link(wpa_s, sta);
+
+ mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
+}
+
+
+void wpa_mesh_new_mesh_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
+ struct ieee802_11_elems *elems)
+{
+ struct hostapd_sta_add_params params;
+ struct mesh_conf *conf = wpa_s->ifmsh->mconf;
+ struct hostapd_data *data = wpa_s->ifmsh->bss[0];
+ struct sta_info *sta;
+ int ret = 0;
+
+ sta = ap_get_sta(data, addr);
+ if (!sta) {
+ sta = ap_sta_add(data, addr);
+ if (!sta)
+ return;
+ }
+
+ /* initialize sta */
+ if (copy_supp_rates(wpa_s, sta, elems))
+ return;
+
+ mesh_mpm_init_link(wpa_s, sta);
+
+ /* insert into driver */
+ os_memset(¶ms, 0, sizeof(params));
+ params.supp_rates = sta->supported_rates;
+ params.supp_rates_len = sta->supported_rates_len;
+ params.addr = addr;
+ params.plink_state = sta->plink_state;
+ params.aid = sta->peer_lid;
+ params.listen_interval = 100;
+ /* TODO: HT capabilities */
+ params.flags |= WPA_STA_WMM;
+ params.flags_mask |= WPA_STA_AUTHENTICATED;
+ if (conf->security == MESH_CONF_SEC_NONE) {
+ params.flags |= WPA_STA_AUTHORIZED;
+ params.flags |= WPA_STA_AUTHENTICATED;
+ } else {
+ sta->flags |= WLAN_STA_MFP;
+ params.flags |= WPA_STA_MFP;
+ }
+
+ ret = wpa_drv_sta_add(wpa_s, ¶ms);
+ if (ret) {
+ wpa_msg(wpa_s, MSG_ERROR,
+ "Driver failed to insert " MACSTR ": %d",
+ MAC2STR(addr), ret);
+ return;
+ }
+
+ mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
+}
+
+
+void mesh_mpm_mgmt_rx(struct wpa_supplicant *wpa_s, struct rx_mgmt *rx_mgmt)
+{
+ struct hostapd_frame_info fi;
+
+ os_memset(&fi, 0, sizeof(fi));
+ fi.datarate = rx_mgmt->datarate;
+ fi.ssi_signal = rx_mgmt->ssi_signal;
+ ieee802_11_mgmt(wpa_s->ifmsh->bss[0], rx_mgmt->frame,
+ rx_mgmt->frame_len, &fi);
+}
+
+
+static void mesh_mpm_plink_estab(struct wpa_supplicant *wpa_s,
+ struct sta_info *sta)
+{
+ struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
+
+ wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR " established",
+ MAC2STR(sta->addr));
+
+ wpa_mesh_set_plink_state(wpa_s, sta, PLINK_ESTAB);
+ hapd->num_plinks++;
+
+ sta->flags |= WLAN_STA_ASSOC;
+
+ eloop_cancel_timeout(plink_timer, wpa_s, sta);
+
+ /* Send ctrl event */
+ wpa_msg_ctrl(wpa_s, MSG_INFO, MESH_PEER_CONNECTED MACSTR,
+ MAC2STR(sta->addr));
+}
+
+
+static void mesh_mpm_fsm(struct wpa_supplicant *wpa_s, struct sta_info *sta,
+ enum plink_event event)
+{
+ struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
+ u16 reason = 0;
+
+ wpa_msg(wpa_s, MSG_DEBUG, "MPM " MACSTR " state %s event %s",
+ MAC2STR(sta->addr), mplstate[sta->plink_state],
+ mplevent[event]);
+
+ switch (sta->plink_state) {
+ case PLINK_LISTEN:
+ switch (event) {
+ case CLS_ACPT:
+ mesh_mpm_fsm_restart(wpa_s, sta);
+ break;
+ case OPN_ACPT:
+ mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_RCVD);
+ mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CONFIRM,
+ 0);
+ break;
+ default:
+ break;
+ }
+ break;
+ case PLINK_OPEN_SENT:
+ switch (event) {
+ case OPN_RJCT:
+ case CNF_RJCT:
+ reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
+ /* fall-through */
+ case CLS_ACPT:
+ wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
+ if (!reason)
+ reason = WLAN_REASON_MESH_CLOSE_RCVD;
+ eloop_register_timeout(dot11MeshHoldingTimeout, 0,
+ plink_timer, wpa_s, sta);
+ mesh_mpm_send_plink_action(wpa_s, sta,
+ PLINK_CLOSE, reason);
+ break;
+ case OPN_ACPT:
+ /* retry timer is left untouched */
+ wpa_mesh_set_plink_state(wpa_s, sta, PLINK_OPEN_RCVD);
+ mesh_mpm_send_plink_action(wpa_s, sta,
+ PLINK_CONFIRM, 0);
+ break;
+ case CNF_ACPT:
+ wpa_mesh_set_plink_state(wpa_s, sta, PLINK_CNF_RCVD);
+ eloop_register_timeout(dot11MeshConfirmTimeout, 0,
+ plink_timer, wpa_s, sta);
+ break;
+ default:
+ break;
+ }
+ break;
+ case PLINK_OPEN_RCVD:
+ switch (event) {
+ case OPN_RJCT:
+ case CNF_RJCT:
+ reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
+ /* fall-through */
+ case CLS_ACPT:
+ wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
+ if (!reason)
+ reason = WLAN_REASON_MESH_CLOSE_RCVD;
+ eloop_register_timeout(dot11MeshHoldingTimeout, 0,
+ plink_timer, wpa_s, sta);
+ sta->mpm_close_reason = reason;
+ mesh_mpm_send_plink_action(wpa_s, sta,
+ PLINK_CLOSE, reason);
+ break;
+ case OPN_ACPT:
+ mesh_mpm_send_plink_action(wpa_s, sta,
+ PLINK_CONFIRM, 0);
+ break;
+ case CNF_ACPT:
+ mesh_mpm_plink_estab(wpa_s, sta);
+ break;
+ default:
+ break;
+ }
+ break;
+ case PLINK_CNF_RCVD:
+ switch (event) {
+ case OPN_RJCT:
+ case CNF_RJCT:
+ reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
+ /* fall-through */
+ case CLS_ACPT:
+ wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
+ if (!reason)
+ reason = WLAN_REASON_MESH_CLOSE_RCVD;
+ eloop_register_timeout(dot11MeshHoldingTimeout, 0,
+ plink_timer, wpa_s, sta);
+ sta->mpm_close_reason = reason;
+ mesh_mpm_send_plink_action(wpa_s, sta,
+ PLINK_CLOSE, reason);
+ break;
+ case OPN_ACPT:
+ mesh_mpm_plink_estab(wpa_s, sta);
+ mesh_mpm_send_plink_action(wpa_s, sta,
+ PLINK_CONFIRM, 0);
+ break;
+ default:
+ break;
+ }
+ break;
+ case PLINK_ESTAB:
+ switch (event) {
+ case CLS_ACPT:
+ wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
+ reason = WLAN_REASON_MESH_CLOSE_RCVD;
+
+ eloop_register_timeout(dot11MeshHoldingTimeout, 0,
+ plink_timer, wpa_s, sta);
+ sta->mpm_close_reason = reason;
+
+ wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR
+ " closed with reason %d",
+ MAC2STR(sta->addr), reason);
+
+ wpa_msg_ctrl(wpa_s, MSG_INFO,
+ MESH_PEER_DISCONNECTED MACSTR,
+ MAC2STR(sta->addr));
+
+ hapd->num_plinks--;
+
+ mesh_mpm_send_plink_action(wpa_s, sta,
+ PLINK_CLOSE, reason);
+ break;
+ case OPN_ACPT:
+ mesh_mpm_send_plink_action(wpa_s, sta,
+ PLINK_CONFIRM, 0);
+ break;
+ default:
+ break;
+ }
+ break;
+ case PLINK_HOLDING:
+ switch (event) {
+ case CLS_ACPT:
+ mesh_mpm_fsm_restart(wpa_s, sta);
+ break;
+ case OPN_ACPT:
+ case CNF_ACPT:
+ case OPN_RJCT:
+ case CNF_RJCT:
+ reason = sta->mpm_close_reason;
+ mesh_mpm_send_plink_action(wpa_s, sta,
+ PLINK_CLOSE, reason);
+ break;
+ default:
+ break;
+ }
+ break;
+ default:
+ wpa_msg(wpa_s, MSG_DEBUG,
+ "Unsupported MPM event %s for state %s",
+ mplevent[event], mplstate[sta->plink_state]);
+ break;
+ }
+}
+
+
+void mesh_mpm_action_rx(struct wpa_supplicant *wpa_s,
+ const struct ieee80211_mgmt *mgmt, size_t len)
+{
+ u8 action_field;
+ struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
+ struct sta_info *sta;
+ u16 plid = 0, llid = 0;
+ enum plink_event event;
+ struct ieee802_11_elems elems;
+ struct mesh_peer_mgmt_ie peer_mgmt_ie;
+ const u8 *ies;
+ size_t ie_len;
+ int ret;
+
+ if (mgmt->u.action.category != WLAN_ACTION_SELF_PROTECTED)
+ return;
+
+ action_field = mgmt->u.action.u.slf_prot_action.action;
+
+ ies = mgmt->u.action.u.slf_prot_action.variable;
+ ie_len = (const u8 *) mgmt + len -
+ mgmt->u.action.u.slf_prot_action.variable;
+
+ /* at least expect mesh id and peering mgmt */
+ if (ie_len < 2 + 2)
+ return;
+
+ if (action_field == PLINK_OPEN || action_field == PLINK_CONFIRM) {
+ ies += 2; /* capability */
+ ie_len -= 2;
+ }
+ if (action_field == PLINK_CONFIRM) {
+ ies += 2; /* aid */
+ ie_len -= 2;
+ }
+
+ /* check for mesh peering, mesh id and mesh config IEs */
+ if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed)
+ return;
+ if (!elems.peer_mgmt)
+ return;
+ if ((action_field != PLINK_CLOSE) &&
+ (!elems.mesh_id || !elems.mesh_config))
+ return;
+
+ if (action_field != PLINK_CLOSE && !matches_local(wpa_s, &elems))
+ return;
+
+ ret = mesh_mpm_parse_peer_mgmt(wpa_s, action_field,
+ elems.peer_mgmt,
+ elems.peer_mgmt_len,
+ &peer_mgmt_ie);
+ if (ret)
+ return;
+
+ /* the sender's llid is our plid and vice-versa */
+ plid = WPA_GET_LE16(peer_mgmt_ie.llid);
+ if (peer_mgmt_ie.plid)
+ llid = WPA_GET_LE16(peer_mgmt_ie.plid);
+
+ sta = ap_get_sta(hapd, mgmt->sa);
+ if (!sta)
+ return;
+
+ if (!sta->my_lid)
+ mesh_mpm_init_link(wpa_s, sta);
+
+ if (sta->plink_state == PLINK_BLOCKED)
+ return;
+
+ /* Now we will figure out the appropriate event... */
+ switch (action_field) {
+ case PLINK_OPEN:
+ if (!plink_free_count(hapd) ||
+ (sta->peer_lid && sta->peer_lid != plid)) {
+ event = OPN_IGNR;
+ } else {
+ sta->peer_lid = plid;
+ event = OPN_ACPT;
+ }
+ break;
+ case PLINK_CONFIRM:
+ if (!plink_free_count(hapd) ||
+ sta->my_lid != llid ||
+ (sta->peer_lid && sta->peer_lid != plid)) {
+ event = CNF_IGNR;
+ } else {
+ if (!sta->peer_lid)
+ sta->peer_lid = plid;
+ event = CNF_ACPT;
+ }
+ break;
+ case PLINK_CLOSE:
+ if (sta->plink_state == PLINK_ESTAB)
+ /* Do not check for llid or plid. This does not
+ * follow the standard but since multiple plinks
+ * per cand are not supported, it is necessary in
+ * order to avoid a livelock when MP A sees an
+ * establish peer link to MP B but MP B does not
+ * see it. This can be caused by a timeout in
+ * B's peer link establishment or B being
+ * restarted.
+ */
+ event = CLS_ACPT;
+ else if (sta->peer_lid != plid)
+ event = CLS_IGNR;
+ else if (peer_mgmt_ie.plid && sta->my_lid != llid)
+ event = CLS_IGNR;
+ else
+ event = CLS_ACPT;
+ break;
+ default:
+ wpa_msg(wpa_s, MSG_ERROR,
+ "Mesh plink: unknown frame subtype");
+ return;
+ }
+ mesh_mpm_fsm(wpa_s, sta, event);
+}
projects / thirdparty / hostap.git / commitdiff
