wpa_auth_ft.c

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/*
 * hostapd - IEEE 802.11r - Fast BSS Transition
 * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "utils/includes.h"

#include "utils/common.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "crypto/aes_wrap.h"
#include "ap_config.h"
#include "ieee802_11.h"
#include "wmm.h"
#include "wpa_auth.h"
#include "wpa_auth_i.h"
#include "wpa_auth_ie.h"


#ifdef CONFIG_IEEE80211R

struct wpa_ft_ies {
        const u8 *mdie;
        size_t mdie_len;
        const u8 *ftie;
        size_t ftie_len;
        const u8 *r1kh_id;
        const u8 *gtk;
        size_t gtk_len;
        const u8 *r0kh_id;
        size_t r0kh_id_len;
        const u8 *rsn;
        size_t rsn_len;
        const u8 *rsn_pmkid;
        const u8 *ric;
        size_t ric_len;
};


static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
                            struct wpa_ft_ies *parse);


static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
                           const u8 *data, size_t data_len)
{
        if (wpa_auth->cb.send_ether == NULL)
                return -1;
        return wpa_auth->cb.send_ether(wpa_auth->cb.ctx, dst, ETH_P_RRB,
                                       data, data_len);
}


static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
                              const u8 *dst, const u8 *data, size_t data_len)
{
        if (wpa_auth->cb.send_ft_action == NULL)
                return -1;
        return wpa_auth->cb.send_ft_action(wpa_auth->cb.ctx, dst,
                                           data, data_len);
}


static struct wpa_state_machine *
wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
{
        if (wpa_auth->cb.add_sta == NULL)
                return NULL;
        return wpa_auth->cb.add_sta(wpa_auth->cb.ctx, sta_addr);
}


int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
{
        u8 *pos = buf;
        u8 capab;
        if (len < 2 + sizeof(struct rsn_mdie))
                return -1;

        *pos++ = WLAN_EID_MOBILITY_DOMAIN;
        *pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
        os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
        pos += MOBILITY_DOMAIN_ID_LEN;
        capab = RSN_FT_CAPAB_FT_OVER_DS;
        *pos++ = capab;

        return pos - buf;
}


int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id,
                   size_t r0kh_id_len,
                   const u8 *anonce, const u8 *snonce,
                   u8 *buf, size_t len, const u8 *subelem,
                   size_t subelem_len)
{
        u8 *pos = buf, *ielen;
        struct rsn_ftie *hdr;

        if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
            subelem_len)
                return -1;

        *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
        ielen = pos++;

        hdr = (struct rsn_ftie *) pos;
        os_memset(hdr, 0, sizeof(*hdr));
        pos += sizeof(*hdr);
        WPA_PUT_LE16(hdr->mic_control, 0);
        if (anonce)
                os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
        if (snonce)
                os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);

        /* Optional Parameters */
        *pos++ = FTIE_SUBELEM_R1KH_ID;
        *pos++ = FT_R1KH_ID_LEN;
        os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
        pos += FT_R1KH_ID_LEN;

        if (r0kh_id) {
                *pos++ = FTIE_SUBELEM_R0KH_ID;
                *pos++ = r0kh_id_len;
                os_memcpy(pos, r0kh_id, r0kh_id_len);
                pos += r0kh_id_len;
        }

        if (subelem) {
                os_memcpy(pos, subelem, subelem_len);
                pos += subelem_len;
        }

        *ielen = pos - buf - 2;

        return pos - buf;
}


struct wpa_ft_pmk_r0_sa {
        struct wpa_ft_pmk_r0_sa *next;
        u8 pmk_r0[PMK_LEN];
        u8 pmk_r0_name[WPA_PMK_NAME_LEN];
        u8 spa[ETH_ALEN];
        int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
        /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
        int pmk_r1_pushed;
};

struct wpa_ft_pmk_r1_sa {
        struct wpa_ft_pmk_r1_sa *next;
        u8 pmk_r1[PMK_LEN];
        u8 pmk_r1_name[WPA_PMK_NAME_LEN];
        u8 spa[ETH_ALEN];
        int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
        /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
};

struct wpa_ft_pmk_cache {
        struct wpa_ft_pmk_r0_sa *pmk_r0;
        struct wpa_ft_pmk_r1_sa *pmk_r1;
};

struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
{
        struct wpa_ft_pmk_cache *cache;

        cache = os_zalloc(sizeof(*cache));

        return cache;
}


void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
{
        struct wpa_ft_pmk_r0_sa *r0, *r0prev;
        struct wpa_ft_pmk_r1_sa *r1, *r1prev;

        r0 = cache->pmk_r0;
        while (r0) {
                r0prev = r0;
                r0 = r0->next;
                os_memset(r0prev->pmk_r0, 0, PMK_LEN);
                os_free(r0prev);
        }

        r1 = cache->pmk_r1;
        while (r1) {
                r1prev = r1;
                r1 = r1->next;
                os_memset(r1prev->pmk_r1, 0, PMK_LEN);
                os_free(r1prev);
        }

        os_free(cache);
}


static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
                               const u8 *spa, const u8 *pmk_r0,
                               const u8 *pmk_r0_name, int pairwise)
{
        struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
        struct wpa_ft_pmk_r0_sa *r0;

        /* TODO: add expiration and limit on number of entries in cache */

        r0 = os_zalloc(sizeof(*r0));
        if (r0 == NULL)
                return -1;

        os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN);
        os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
        os_memcpy(r0->spa, spa, ETH_ALEN);
        r0->pairwise = pairwise;

        r0->next = cache->pmk_r0;
        cache->pmk_r0 = r0;

        return 0;
}


static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
                               const u8 *spa, const u8 *pmk_r0_name,
                               u8 *pmk_r0, int *pairwise)
{
        struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
        struct wpa_ft_pmk_r0_sa *r0;

        r0 = cache->pmk_r0;
        while (r0) {
                if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 &&
                    os_memcmp(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN)
                    == 0) {
                        os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN);
                        if (pairwise)
                                *pairwise = r0->pairwise;
                        return 0;
                }

                r0 = r0->next;
        }

        return -1;
}


static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
                               const u8 *spa, const u8 *pmk_r1,
                               const u8 *pmk_r1_name, int pairwise)
{
        struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
        struct wpa_ft_pmk_r1_sa *r1;

        /* TODO: add expiration and limit on number of entries in cache */

        r1 = os_zalloc(sizeof(*r1));
        if (r1 == NULL)
                return -1;

        os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN);
        os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
        os_memcpy(r1->spa, spa, ETH_ALEN);
        r1->pairwise = pairwise;

        r1->next = cache->pmk_r1;
        cache->pmk_r1 = r1;

        return 0;
}


static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
                               const u8 *spa, const u8 *pmk_r1_name,
                               u8 *pmk_r1, int *pairwise)
{
        struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
        struct wpa_ft_pmk_r1_sa *r1;

        r1 = cache->pmk_r1;
        while (r1) {
                if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
                    os_memcmp(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN)
                    == 0) {
                        os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN);
                        if (pairwise)
                                *pairwise = r1->pairwise;
                        return 0;
                }

                r1 = r1->next;
        }

        return -1;
}


static int wpa_ft_pull_pmk_r1(struct wpa_authenticator *wpa_auth,
                              const u8 *s1kh_id, const u8 *r0kh_id,
                              size_t r0kh_id_len, const u8 *pmk_r0_name)
{
        struct ft_remote_r0kh *r0kh;
        struct ft_r0kh_r1kh_pull_frame frame, f;

        r0kh = wpa_auth->conf.r0kh_list;
        while (r0kh) {
                if (r0kh->id_len == r0kh_id_len &&
                    os_memcmp(r0kh->id, r0kh_id, r0kh_id_len) == 0)
                        break;
                r0kh = r0kh->next;
        }
        if (r0kh == NULL)
                return -1;

        wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH "
                   "address " MACSTR, MAC2STR(r0kh->addr));

        os_memset(&frame, 0, sizeof(frame));
        frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
        frame.packet_type = FT_PACKET_R0KH_R1KH_PULL;
        frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN);
        os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);

        /* aes_wrap() does not support inplace encryption, so use a temporary
         * buffer for the data. */
        if (os_get_random(f.nonce, sizeof(f.nonce))) {
                wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
                           "nonce");
                return -1;
        }
        os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
        os_memcpy(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
        os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);

        if (aes_wrap(r0kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
                     f.nonce, frame.nonce) < 0)
                return -1;

        wpa_ft_rrb_send(wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame));

        return 0;
}


int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
                           struct wpa_ptk *ptk, size_t ptk_len)
{
        u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
        u8 pmk_r1[PMK_LEN];
        u8 ptk_name[WPA_PMK_NAME_LEN];
        const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
        const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
        size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
        const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
        const u8 *ssid = sm->wpa_auth->conf.ssid;
        size_t ssid_len = sm->wpa_auth->conf.ssid_len;


        if (sm->xxkey_len == 0) {
                wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
                           "derivation");
                return -1;
        }

        wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
                          r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name);
        wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
        wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
        wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name,
                            sm->pairwise);

        wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
                          pmk_r1, sm->pmk_r1_name);
        wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
        wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
                    WPA_PMK_NAME_LEN);
        wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, sm->pmk_r1_name,
                            sm->pairwise);

        wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
                          sm->wpa_auth->addr, sm->pmk_r1_name,
                          (u8 *) ptk, ptk_len, ptk_name);
        wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len);
        wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);

        return 0;
}


static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
                                      const u8 *addr, int idx, u8 *seq)
{
        if (wpa_auth->cb.get_seqnum == NULL)
                return -1;
        return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
}


static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
{
        u8 *subelem;
        struct wpa_group *gsm = sm->group;
        size_t subelem_len, pad_len;
        const u8 *key;
        size_t key_len;
        u8 keybuf[32];

        key_len = gsm->GTK_len;
        if (key_len > sizeof(keybuf))
                return NULL;

        /*
         * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
         * than 16 bytes.
         */
        pad_len = key_len % 8;
        if (pad_len)
                pad_len = 8 - pad_len;
        if (key_len + pad_len < 16)
                pad_len += 8;
        if (pad_len) {
                os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
                os_memset(keybuf + key_len, 0, pad_len);
                keybuf[key_len] = 0xdd;
                key_len += pad_len;
                key = keybuf;
        } else
                key = gsm->GTK[gsm->GN - 1];

        /*
         * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
         * Key[5..32].
         */
        subelem_len = 13 + key_len + 8;
        subelem = os_zalloc(subelem_len);
        if (subelem == NULL)
                return NULL;

        subelem[0] = FTIE_SUBELEM_GTK;
        subelem[1] = 11 + key_len + 8;
        /* Key ID in B0-B1 of Key Info */
        WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
        subelem[4] = gsm->GTK_len;
        wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5);
        if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 13)) {
                os_free(subelem);
                return NULL;
        }

        *len = subelem_len;
        return subelem;
}


#ifdef CONFIG_IEEE80211W
static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
{
        u8 *subelem, *pos;
        struct wpa_group *gsm = sm->group;
        size_t subelem_len;

        /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
         * Key[16+8] */
        subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8;
        subelem = os_zalloc(subelem_len);
        if (subelem == NULL)
                return NULL;

        pos = subelem;
        *pos++ = FTIE_SUBELEM_IGTK;
        *pos++ = subelem_len - 2;
        WPA_PUT_LE16(pos, gsm->GN_igtk);
        pos += 2;
        wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
        pos += 6;
        *pos++ = WPA_IGTK_LEN;
        if (aes_wrap(sm->PTK.kek, WPA_IGTK_LEN / 8,
                     gsm->IGTK[gsm->GN_igtk - 4], pos)) {
                os_free(subelem);
                return NULL;
        }

        *len = subelem_len;
        return subelem;
}
#endif /* CONFIG_IEEE80211W */


static u8 * wpa_ft_process_rdie(u8 *pos, u8 *end, u8 id, u8 descr_count,
                                const u8 *ies, size_t ies_len)
{
        struct ieee802_11_elems parse;
        struct rsn_rdie *rdie;

        wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d",
                   id, descr_count);
        wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)",
                    ies, ies_len);

        if (end - pos < (int) sizeof(*rdie)) {
                wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE");
                return pos;
        }

        *pos++ = WLAN_EID_RIC_DATA;
        *pos++ = sizeof(*rdie);
        rdie = (struct rsn_rdie *) pos;
        rdie->id = id;
        rdie->descr_count = 0;
        rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS);
        pos += sizeof(*rdie);

        if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) ==
            ParseFailed) {
                wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs");
                rdie->status_code =
                        host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
                return pos;
        }

#ifdef NEED_AP_MLME
        if (parse.wmm_tspec) {
                struct wmm_tspec_element *tspec;
                int res;

                if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
                        wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
                                   "(%d)", (int) parse.wmm_tspec_len);
                        rdie->status_code =
                                host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
                        return pos;
                }
                if (end - pos < (int) sizeof(*tspec)) {
                        wpa_printf(MSG_ERROR, "FT: Not enough room for "
                                   "response TSPEC");
                        rdie->status_code =
                                host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
                        return pos;
                }
                tspec = (struct wmm_tspec_element *) pos;
                os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
                res = wmm_process_tspec(tspec);
                wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
                if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
                        rdie->status_code =
                                host_to_le16(WLAN_STATUS_INVALID_PARAMETERS);
                else if (res == WMM_ADDTS_STATUS_REFUSED)
                        rdie->status_code =
                                host_to_le16(WLAN_STATUS_REQUEST_DECLINED);
                else {
                        /* TSPEC accepted; include updated TSPEC in response */
                        rdie->descr_count = 1;
                        pos += sizeof(*tspec);
                }
                return pos;
        }
#endif /* NEED_AP_MLME */

        wpa_printf(MSG_DEBUG, "FT: No supported resource requested");
        rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
        return pos;
}


static u8 * wpa_ft_process_ric(u8 *pos, u8 *end, const u8 *ric, size_t ric_len)
{
        const u8 *rpos, *start;
        const struct rsn_rdie *rdie;

        wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len);

        rpos = ric;
        while (rpos + sizeof(*rdie) < ric + ric_len) {
                if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) ||
                    rpos + 2 + rpos[1] > ric + ric_len)
                        break;
                rdie = (const struct rsn_rdie *) (rpos + 2);
                rpos += 2 + rpos[1];
                start = rpos;

                while (rpos + 2 <= ric + ric_len &&
                       rpos + 2 + rpos[1] <= ric + ric_len) {
                        if (rpos[0] == WLAN_EID_RIC_DATA)
                                break;
                        rpos += 2 + rpos[1];
                }
                pos = wpa_ft_process_rdie(pos, end, rdie->id,
                                          rdie->descr_count,
                                          start, rpos - start);
        }

        return pos;
}


u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
                                 size_t max_len, int auth_alg,
                                 const u8 *req_ies, size_t req_ies_len)
{
        u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
        size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
        int res;
        struct wpa_auth_config *conf;
        struct rsn_ftie *_ftie;
        struct wpa_ft_ies parse;
        u8 *ric_start;
        u8 *anonce, *snonce;

        if (sm == NULL)
                return pos;

        conf = &sm->wpa_auth->conf;

        if (sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
            sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_PSK)
                return pos;

        end = pos + max_len;

        if (auth_alg == WLAN_AUTH_FT) {
                /*
                 * RSN (only present if this is a Reassociation Response and
                 * part of a fast BSS transition)
                 */
                res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
                if (res < 0)
                        return pos;
                rsnie = pos;
                rsnie_len = res;
                pos += res;
        }

        /* Mobility Domain Information */
        res = wpa_write_mdie(conf, pos, end - pos);
        if (res < 0)
                return pos;
        mdie = pos;
        mdie_len = res;
        pos += res;

        /* Fast BSS Transition Information */
        if (auth_alg == WLAN_AUTH_FT) {
                subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
                r0kh_id = sm->r0kh_id;
                r0kh_id_len = sm->r0kh_id_len;
                anonce = sm->ANonce;
                snonce = sm->SNonce;
#ifdef CONFIG_IEEE80211W
                if (sm->mgmt_frame_prot) {
                        u8 *igtk;
                        size_t igtk_len;
                        u8 *nbuf;
                        igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
                        if (igtk == NULL) {
                                os_free(subelem);
                                return pos;
                        }
                        nbuf = os_realloc(subelem, subelem_len + igtk_len);
                        if (nbuf == NULL) {
                                os_free(subelem);
                                os_free(igtk);
                                return pos;
                        }
                        subelem = nbuf;
                        os_memcpy(subelem + subelem_len, igtk, igtk_len);
                        subelem_len += igtk_len;
                        os_free(igtk);
                }
#endif /* CONFIG_IEEE80211W */
        } else {
                r0kh_id = conf->r0_key_holder;
                r0kh_id_len = conf->r0_key_holder_len;
                anonce = NULL;
                snonce = NULL;
        }
        res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos,
                             end - pos, subelem, subelem_len);
        os_free(subelem);
        if (res < 0)
                return pos;
        ftie = pos;
        ftie_len = res;
        pos += res;

        os_free(sm->assoc_resp_ftie);
        sm->assoc_resp_ftie = os_malloc(ftie_len);
        if (sm->assoc_resp_ftie)
                os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len);

        _ftie = (struct rsn_ftie *) (ftie + 2);
        if (auth_alg == WLAN_AUTH_FT)
                _ftie->mic_control[1] = 3; /* Information element count */

        ric_start = pos;
        if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) {
                pos = wpa_ft_process_ric(pos, end, parse.ric, parse.ric_len);
                if (auth_alg == WLAN_AUTH_FT)
                        _ftie->mic_control[1] +=
                                ieee802_11_ie_count(ric_start,
                                                    pos - ric_start);
        }
        if (ric_start == pos)
                ric_start = NULL;

        if (auth_alg == WLAN_AUTH_FT &&
            wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 6,
                       mdie, mdie_len, ftie, ftie_len,
                       rsnie, rsnie_len,
                       ric_start, ric_start ? pos - ric_start : 0,
                       _ftie->mic) < 0)
                wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");

        return pos;
}


static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len,
                             struct wpa_ft_ies *parse)
{
        const u8 *end, *pos;

        parse->ftie = ie;
        parse->ftie_len = ie_len;

        pos = ie + sizeof(struct rsn_ftie);
        end = ie + ie_len;

        while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
                switch (pos[0]) {
                case FTIE_SUBELEM_R1KH_ID:
                        if (pos[1] != FT_R1KH_ID_LEN) {
                                wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID "
                                           "length in FTIE: %d", pos[1]);
                                return -1;
                        }
                        parse->r1kh_id = pos + 2;
                        break;
                case FTIE_SUBELEM_GTK:
                        parse->gtk = pos + 2;
                        parse->gtk_len = pos[1];
                        break;
                case FTIE_SUBELEM_R0KH_ID:
                        if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) {
                                wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID "
                                           "length in FTIE: %d", pos[1]);
                                return -1;
                        }
                        parse->r0kh_id = pos + 2;
                        parse->r0kh_id_len = pos[1];
                        break;
                }

                pos += 2 + pos[1];
        }

        return 0;
}


static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
                            struct wpa_ft_ies *parse)
{
        const u8 *end, *pos;
        struct wpa_ie_data data;
        int ret;
        const struct rsn_ftie *ftie;
        int prot_ie_count = 0;

        os_memset(parse, 0, sizeof(*parse));
        if (ies == NULL)
                return 0;

        pos = ies;
        end = ies + ies_len;
        while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
                switch (pos[0]) {
                case WLAN_EID_RSN:
                        parse->rsn = pos + 2;
                        parse->rsn_len = pos[1];
                        ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2,
                                                   parse->rsn_len + 2,
                                                   &data);
                        if (ret < 0) {
                                wpa_printf(MSG_DEBUG, "FT: Failed to parse "
                                           "RSN IE: %d", ret);
                                return -1;
                        }
                        if (data.num_pmkid == 1 && data.pmkid)
                                parse->rsn_pmkid = data.pmkid;
                        break;
                case WLAN_EID_MOBILITY_DOMAIN:
                        parse->mdie = pos + 2;
                        parse->mdie_len = pos[1];
                        break;
                case WLAN_EID_FAST_BSS_TRANSITION:
                        if (pos[1] < sizeof(*ftie))
                                return -1;
                        ftie = (const struct rsn_ftie *) (pos + 2);
                        prot_ie_count = ftie->mic_control[1];
                        if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0)
                                return -1;
                        break;
                case WLAN_EID_RIC_DATA:
                        if (parse->ric == NULL)
                                parse->ric = pos;
                }

                pos += 2 + pos[1];
        }

        if (prot_ie_count == 0)
                return 0; /* no MIC */

        /*
         * Check that the protected IE count matches with IEs included in the
         * frame.
         */
        if (parse->rsn)
                prot_ie_count--;
        if (parse->mdie)
                prot_ie_count--;
        if (parse->ftie)
                prot_ie_count--;
        if (prot_ie_count < 0) {
                wpa_printf(MSG_DEBUG, "FT: Some required IEs not included in "
                           "the protected IE count");
                return -1;
        }

        if (prot_ie_count == 0 && parse->ric) {
                wpa_printf(MSG_DEBUG, "FT: RIC IE(s) in the frame, but not "
                           "included in protected IE count");
                return -1;
        }

        /* Determine the end of the RIC IE(s) */
        pos = parse->ric;
        while (pos && pos + 2 <= end && pos + 2 + pos[1] <= end &&
               prot_ie_count) {
                prot_ie_count--;
                pos += 2 + pos[1];
        }
        parse->ric_len = pos - parse->ric;
        if (prot_ie_count) {
                wpa_printf(MSG_DEBUG, "FT: %d protected IEs missing from "
                           "frame", (int) prot_ie_count);
                return -1;
        }

        return 0;
}


static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
                                   int vlan_id,
                                   enum wpa_alg alg, const u8 *addr, int idx,
                                   u8 *key, size_t key_len)
{
        if (wpa_auth->cb.set_key == NULL)
                return -1;
        return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
                                    key, key_len);
}


void wpa_ft_install_ptk(struct wpa_state_machine *sm)
{
        enum wpa_alg alg;
        int klen;

        /* MLME-SETKEYS.request(PTK) */
        if (sm->pairwise == WPA_CIPHER_TKIP) {
                alg = WPA_ALG_TKIP;
                klen = 32;
        } else if (sm->pairwise == WPA_CIPHER_CCMP) {
                alg = WPA_ALG_CCMP;
                klen = 16;
        } else {
                wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip "
                           "PTK configuration", sm->pairwise);
                return;
        }

        /* FIX: add STA entry to kernel/driver here? The set_key will fail
         * most likely without this.. At the moment, STA entry is added only
         * after association has been completed. This function will be called
         * again after association to get the PTK configured, but that could be
         * optimized by adding the STA entry earlier.
         */
        if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
                             sm->PTK.tk1, klen))
                return;

        /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
        sm->pairwise_set = TRUE;
}


static u16 wpa_ft_process_auth_req(struct wpa_state_machine *sm,
                                   const u8 *ies, size_t ies_len,
                                   u8 **resp_ies, size_t *resp_ies_len)
{
        struct rsn_mdie *mdie;
        struct rsn_ftie *ftie;
        u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
        u8 ptk_name[WPA_PMK_NAME_LEN];
        struct wpa_auth_config *conf;
        struct wpa_ft_ies parse;
        size_t buflen, ptk_len;
        int ret;
        u8 *pos, *end;
        int pairwise;

        *resp_ies = NULL;
        *resp_ies_len = 0;

        sm->pmk_r1_name_valid = 0;
        conf = &sm->wpa_auth->conf;

        wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
                    ies, ies_len);

        if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
                wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
                return WLAN_STATUS_UNSPECIFIED_FAILURE;
        }

        mdie = (struct rsn_mdie *) parse.mdie;
        if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
            os_memcmp(mdie->mobility_domain,
                      sm->wpa_auth->conf.mobility_domain,
                      MOBILITY_DOMAIN_ID_LEN) != 0) {
                wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
                return WLAN_STATUS_INVALID_MDIE;
        }

        ftie = (struct rsn_ftie *) parse.ftie;
        if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
                wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
                return WLAN_STATUS_INVALID_FTIE;
        }

        os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);

        if (parse.r0kh_id == NULL) {
                wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
                return WLAN_STATUS_INVALID_FTIE;
        }

        wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
                    parse.r0kh_id, parse.r0kh_id_len);
        os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
        sm->r0kh_id_len = parse.r0kh_id_len;

        if (parse.rsn_pmkid == NULL) {
                wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
                return WLAN_STATUS_INVALID_PMKID;
        }

        wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
                    parse.rsn_pmkid, WPA_PMK_NAME_LEN);
        wpa_derive_pmk_r1_name(parse.rsn_pmkid,
                               sm->wpa_auth->conf.r1_key_holder, sm->addr,
                               pmk_r1_name);
        wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
                    pmk_r1_name, WPA_PMK_NAME_LEN);

        if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1,
                    &pairwise) < 0) {
                if (wpa_ft_pull_pmk_r1(sm->wpa_auth, sm->addr, sm->r0kh_id,
                                       sm->r0kh_id_len, parse.rsn_pmkid) < 0) {
                        wpa_printf(MSG_DEBUG, "FT: Did not have matching "
                                   "PMK-R1 and unknown R0KH-ID");
                        return WLAN_STATUS_INVALID_PMKID;
                }

                /*
                 * TODO: Should return "status pending" (and the caller should
                 * not send out response now). The real response will be sent
                 * once the response from R0KH is received.
                 */
                return WLAN_STATUS_INVALID_PMKID;
        }

        wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN);
        sm->pmk_r1_name_valid = 1;
        os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);

        if (os_get_random(sm->ANonce, WPA_NONCE_LEN)) {
                wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
                           "ANonce");
                return WLAN_STATUS_UNSPECIFIED_FAILURE;
        }

        wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
                    sm->SNonce, WPA_NONCE_LEN);
        wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
                    sm->ANonce, WPA_NONCE_LEN);

        ptk_len = pairwise != WPA_CIPHER_CCMP ? 64 : 48;
        wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
                          sm->wpa_auth->addr, pmk_r1_name,
                          (u8 *) &sm->PTK, ptk_len, ptk_name);
        wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
                        (u8 *) &sm->PTK, ptk_len);
        wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);

        sm->pairwise = pairwise;
        wpa_ft_install_ptk(sm);

        buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
                2 + FT_R1KH_ID_LEN + 200;
        *resp_ies = os_zalloc(buflen);
        if (*resp_ies == NULL) {
                return WLAN_STATUS_UNSPECIFIED_FAILURE;
        }

        pos = *resp_ies;
        end = *resp_ies + buflen;

        ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
        if (ret < 0) {
                os_free(*resp_ies);
                *resp_ies = NULL;
                return WLAN_STATUS_UNSPECIFIED_FAILURE;
        }
        pos += ret;

        ret = wpa_write_mdie(conf, pos, end - pos);
        if (ret < 0) {
                os_free(*resp_ies);
                *resp_ies = NULL;
                return WLAN_STATUS_UNSPECIFIED_FAILURE;
        }
        pos += ret;

        ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len,
                             sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
        if (ret < 0) {
                os_free(*resp_ies);
                *resp_ies = NULL;
                return WLAN_STATUS_UNSPECIFIED_FAILURE;
        }
        pos += ret;

        *resp_ies_len = pos - *resp_ies;

        return WLAN_STATUS_SUCCESS;
}


void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
                         u16 auth_transaction, const u8 *ies, size_t ies_len,
                         void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
                                    u16 auth_transaction, u16 status,
                                    const u8 *ies, size_t ies_len),
                         void *ctx)
{
        u16 status;
        u8 *resp_ies;
        size_t resp_ies_len;

        if (sm == NULL) {
                wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
                           "WPA SM not available");
                return;
        }

        wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
                   " BSSID=" MACSTR " transaction=%d",
                   MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
        status = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
                                         &resp_ies_len);

        wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
                   " auth_transaction=%d status=%d",
                   MAC2STR(sm->addr), auth_transaction + 1, status);
        wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
        cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
           resp_ies, resp_ies_len);
        os_free(resp_ies);
}


u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
                            size_t ies_len)
{
        struct wpa_ft_ies parse;
        struct rsn_mdie *mdie;
        struct rsn_ftie *ftie;
        u8 mic[16];
        unsigned int count;

        if (sm == NULL)
                return WLAN_STATUS_UNSPECIFIED_FAILURE;

        wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);

        if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
                wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
                return WLAN_STATUS_UNSPECIFIED_FAILURE;
        }

        if (parse.rsn == NULL) {
                wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
                return WLAN_STATUS_UNSPECIFIED_FAILURE;
        }

        if (parse.rsn_pmkid == NULL) {
                wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
                return WLAN_STATUS_INVALID_PMKID;
        }

        if (os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0)
        {
                wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
                           "with the PMKR1Name derived from auth request");
                return WLAN_STATUS_INVALID_PMKID;
        }

        mdie = (struct rsn_mdie *) parse.mdie;
        if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
            os_memcmp(mdie->mobility_domain,
                      sm->wpa_auth->conf.mobility_domain,
                      MOBILITY_DOMAIN_ID_LEN) != 0) {
                wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
                return WLAN_STATUS_INVALID_MDIE;
        }

        ftie = (struct rsn_ftie *) parse.ftie;
        if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
                wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
                return WLAN_STATUS_INVALID_FTIE;
        }

        if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
                wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
                wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
                            ftie->snonce, WPA_NONCE_LEN);
                wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
                            sm->SNonce, WPA_NONCE_LEN);
                return -1;
        }

        if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
                wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
                wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
                            ftie->anonce, WPA_NONCE_LEN);
                wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
                            sm->ANonce, WPA_NONCE_LEN);
                return -1;
        }


        if (parse.r0kh_id == NULL) {
                wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
                return -1;
        }

        if (parse.r0kh_id_len != sm->r0kh_id_len ||
            os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
                wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
                           "the current R0KH-ID");
                wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
                            parse.r0kh_id, parse.r0kh_id_len);
                wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
                            sm->r0kh_id, sm->r0kh_id_len);
                return -1;
        }

        if (parse.r1kh_id == NULL) {
                wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
                return -1;
        }

        if (os_memcmp(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder,
                      FT_R1KH_ID_LEN) != 0) {
                wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
                           "ReassocReq");
                wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE",
                            parse.r1kh_id, FT_R1KH_ID_LEN);
                wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID",
                            sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
                return -1;
        }

        if (parse.rsn_pmkid == NULL ||
            os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
                wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
                           "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
                return -1;
        }

        count = 3;
        if (parse.ric)
                count++;
        if (ftie->mic_control[1] != count) {
                wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
                           "Control: received %u expected %u",
                           ftie->mic_control[1], count);
                return -1;
        }

        if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 5,
                       parse.mdie - 2, parse.mdie_len + 2,
                       parse.ftie - 2, parse.ftie_len + 2,
                       parse.rsn - 2, parse.rsn_len + 2,
                       parse.ric, parse.ric_len,
                       mic) < 0) {
                wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
                return WLAN_STATUS_UNSPECIFIED_FAILURE;
        }

        if (os_memcmp(mic, ftie->mic, 16) != 0) {
                wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
                wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
                wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
                return WLAN_STATUS_INVALID_FTIE;
        }

        return WLAN_STATUS_SUCCESS;
}


int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
{
        const u8 *sta_addr, *target_ap;
        const u8 *ies;
        size_t ies_len;
        u8 action;
        struct ft_rrb_frame *frame;

        if (sm == NULL)
                return -1;

        /*
         * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
         * FT Request action frame body[variable]
         */

        if (len < 14) {
                wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
                           "(len=%lu)", (unsigned long) len);
                return -1;
        }

        action = data[1];
        sta_addr = data + 2;
        target_ap = data + 8;
        ies = data + 14;
        ies_len = len - 14;

        wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
                   " Target AP=" MACSTR " Action=%d)",
                   MAC2STR(sta_addr), MAC2STR(target_ap), action);

        if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
                wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
                           "STA=" MACSTR " STA-Address=" MACSTR,
                           MAC2STR(sm->addr), MAC2STR(sta_addr));
                return -1;
        }

        /*
         * Do some sanity checking on the target AP address (not own and not
         * broadcast. This could be extended to filter based on a list of known
         * APs in the MD (if such a list were configured).
         */
        if ((target_ap[0] & 0x01) ||
            os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
                wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
                           "frame");
                return -1;
        }

        wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);

        /* RRB - Forward action frame to the target AP */
        frame = os_malloc(sizeof(*frame) + len);
        frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
        frame->packet_type = FT_PACKET_REQUEST;
        frame->action_length = host_to_le16(len);
        os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
        os_memcpy(frame + 1, data, len);

        wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
                        sizeof(*frame) + len);
        os_free(frame);

        return 0;
}


static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
                                 const u8 *current_ap, const u8 *sta_addr,
                                 const u8 *body, size_t len)
{
        struct wpa_state_machine *sm;
        u16 status;
        u8 *resp_ies, *pos;
        size_t resp_ies_len, rlen;
        struct ft_rrb_frame *frame;

        sm = wpa_ft_add_sta(wpa_auth, sta_addr);
        if (sm == NULL) {
                wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
                           "RRB Request");
                return -1;
        }

        wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);

        status = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
                                         &resp_ies_len);

        wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
                   " CurrentAP=" MACSTR " status=%d",
                   MAC2STR(sm->addr), MAC2STR(current_ap), status);
        wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);

        /* RRB - Forward action frame response to the Current AP */

        /*
         * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
         * Status_Code[2] FT Request action frame body[variable]
         */
        rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;

        frame = os_malloc(sizeof(*frame) + rlen);
        frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
        frame->packet_type = FT_PACKET_RESPONSE;
        frame->action_length = host_to_le16(rlen);
        os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
        pos = (u8 *) (frame + 1);
        *pos++ = WLAN_ACTION_FT;
        *pos++ = 2; /* Action: Response */
        os_memcpy(pos, sta_addr, ETH_ALEN);
        pos += ETH_ALEN;
        os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
        pos += ETH_ALEN;
        WPA_PUT_LE16(pos, status);
        pos += 2;
        if (resp_ies) {
                os_memcpy(pos, resp_ies, resp_ies_len);
                os_free(resp_ies);
        }

        wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
                        sizeof(*frame) + rlen);
        os_free(frame);

        return 0;
}


static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
                              const u8 *src_addr,
                              const u8 *data, size_t data_len)
{
        struct ft_r0kh_r1kh_pull_frame *frame, f;
        struct ft_remote_r1kh *r1kh;
        struct ft_r0kh_r1kh_resp_frame resp, r;
        u8 pmk_r0[PMK_LEN];
        int pairwise;

        wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");

        if (data_len < sizeof(*frame))
                return -1;

        r1kh = wpa_auth->conf.r1kh_list;
        while (r1kh) {
                if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0)
                        break;
                r1kh = r1kh->next;
        }
        if (r1kh == NULL) {
                wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for "
                           "PMK-R1 pull source address " MACSTR,
                           MAC2STR(src_addr));
                return -1;
        }

        frame = (struct ft_r0kh_r1kh_pull_frame *) data;
        /* aes_unwrap() does not support inplace decryption, so use a temporary
         * buffer for the data. */
        if (aes_unwrap(r1kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
                       frame->nonce, f.nonce) < 0) {
                wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
                           "request from " MACSTR, MAC2STR(src_addr));
                return -1;
        }

        wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
                    f.nonce, sizeof(f.nonce));
        wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name",
                    f.pmk_r0_name, WPA_PMK_NAME_LEN);
        wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
                   MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));

        os_memset(&resp, 0, sizeof(resp));
        resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
        resp.packet_type = FT_PACKET_R0KH_R1KH_RESP;
        resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN);
        os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN);

        /* aes_wrap() does not support inplace encryption, so use a temporary
         * buffer for the data. */
        os_memcpy(r.nonce, f.nonce, sizeof(f.nonce));
        os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN);
        os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN);
        if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0,
                                &pairwise) < 0) {
                wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for "
                           "PMK-R1 pull");
                return -1;
        }

        wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
                          r.pmk_r1, r.pmk_r1_name);
        wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
        wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
                    WPA_PMK_NAME_LEN);
        r.pairwise = pairwise;

        if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
                     r.nonce, resp.nonce) < 0) {
                os_memset(pmk_r0, 0, PMK_LEN);
                return -1;
        }

        os_memset(pmk_r0, 0, PMK_LEN);

        wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp));

        return 0;
}


static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
                              const u8 *src_addr,
                              const u8 *data, size_t data_len)
{
        struct ft_r0kh_r1kh_resp_frame *frame, f;
        struct ft_remote_r0kh *r0kh;
        int pairwise;

        wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");

        if (data_len < sizeof(*frame))
                return -1;

        r0kh = wpa_auth->conf.r0kh_list;
        while (r0kh) {
                if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
                        break;
                r0kh = r0kh->next;
        }
        if (r0kh == NULL) {
                wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
                           "PMK-R0 pull response source address " MACSTR,
                           MAC2STR(src_addr));
                return -1;
        }

        frame = (struct ft_r0kh_r1kh_resp_frame *) data;
        /* aes_unwrap() does not support inplace decryption, so use a temporary
         * buffer for the data. */
        if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
                       frame->nonce, f.nonce) < 0) {
                wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
                           "response from " MACSTR, MAC2STR(src_addr));
                return -1;
        }

        if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
            != 0) {
                wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a "
                           "matching R1KH-ID");
                return -1;
        }

        /* TODO: verify that <nonce,s1kh_id> matches with a pending request
         * and call this requests callback function to finish request
         * processing */

        pairwise = le_to_host16(f.pairwise);
        wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
                    f.nonce, sizeof(f.nonce));
        wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
                   MACSTR " pairwise=0x%x",
                   MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
        wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1",
                        f.pmk_r1, PMK_LEN);
        wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name",
                        f.pmk_r1_name, WPA_PMK_NAME_LEN);

        wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
                            pairwise);
        os_memset(f.pmk_r1, 0, PMK_LEN);

        return 0;
}


static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
                              const u8 *src_addr,
                              const u8 *data, size_t data_len)
{
        struct ft_r0kh_r1kh_push_frame *frame, f;
        struct ft_remote_r0kh *r0kh;
        struct os_time now;
        os_time_t tsend;
        int pairwise;

        wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");

        if (data_len < sizeof(*frame))
                return -1;

        r0kh = wpa_auth->conf.r0kh_list;
        while (r0kh) {
                if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
                        break;
                r0kh = r0kh->next;
        }
        if (r0kh == NULL) {
                wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
                           "PMK-R0 push source address " MACSTR,
                           MAC2STR(src_addr));
                return -1;
        }

        frame = (struct ft_r0kh_r1kh_push_frame *) data;
        /* aes_unwrap() does not support inplace decryption, so use a temporary
         * buffer for the data. */
        if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
                       frame->timestamp, f.timestamp) < 0) {
                wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from "
                           MACSTR, MAC2STR(src_addr));
                return -1;
        }

        os_get_time(&now);
        tsend = WPA_GET_LE32(f.timestamp);
        if ((now.sec > tsend && now.sec - tsend > 60) ||
            (now.sec < tsend && tsend - now.sec > 60)) {
                wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid "
                           "timestamp: sender time %d own time %d\n",
                           (int) tsend, (int) now.sec);
                return -1;
        }

        if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
            != 0) {
                wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching "
                           "R1KH-ID (received " MACSTR " own " MACSTR ")",
                           MAC2STR(f.r1kh_id),
                           MAC2STR(wpa_auth->conf.r1_key_holder));
                return -1;
        }

        pairwise = le_to_host16(f.pairwise);
        wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
                   MACSTR " pairwise=0x%x",
                   MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
        wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1",
                        f.pmk_r1, PMK_LEN);
        wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name",
                        f.pmk_r1_name, WPA_PMK_NAME_LEN);

        wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
                            pairwise);
        os_memset(f.pmk_r1, 0, PMK_LEN);

        return 0;
}


int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
                  const u8 *data, size_t data_len)
{
        struct ft_rrb_frame *frame;
        u16 alen;
        const u8 *pos, *end, *start;
        u8 action;
        const u8 *sta_addr, *target_ap_addr;

        wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
                   MAC2STR(src_addr));

        if (data_len < sizeof(*frame)) {
                wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
                           (unsigned long) data_len);
                return -1;
        }

        pos = data;
        frame = (struct ft_rrb_frame *) pos;
        pos += sizeof(*frame);

        alen = le_to_host16(frame->action_length);
        wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
                   "action_length=%d ap_address=" MACSTR,
                   frame->frame_type, frame->packet_type, alen,
                   MAC2STR(frame->ap_address));

        if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
                /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
                wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
                           "unrecognized type %d", frame->frame_type);
                return -1;
        }

        if (alen > data_len - sizeof(*frame)) {
                wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
                           "frame");
                return -1;
        }

        if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL)
                return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len);
        if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP)
                return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len);
        if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH)
                return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len);

        wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);

        if (alen < 1 + 1 + 2 * ETH_ALEN) {
                wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
                           "room for Action Frame body); alen=%lu",
                           (unsigned long) alen);
                return -1;
        }
        start = pos;
        end = pos + alen;

        if (*pos != WLAN_ACTION_FT) {
                wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
                           "%d", *pos);
                return -1;
        }

        pos++;
        action = *pos++;
        sta_addr = pos;
        pos += ETH_ALEN;
        target_ap_addr = pos;
        pos += ETH_ALEN;
        wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
                   MACSTR " target_ap_addr=" MACSTR,
                   action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));

        if (frame->packet_type == FT_PACKET_REQUEST) {
                wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");

                if (action != 1) {
                        wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
                                   "RRB Request", action);
                        return -1;
                }

                if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
                        wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
                                   "RRB Request does not match with own "
                                   "address");
                        return -1;
                }

                if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
                                          sta_addr, pos, end - pos) < 0)
                        return -1;
        } else if (frame->packet_type == FT_PACKET_RESPONSE) {
                u16 status_code;

                if (end - pos < 2) {
                        wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
                                   "code in RRB Response");
                        return -1;
                }
                status_code = WPA_GET_LE16(pos);
                pos += 2;

                wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
                           "(status_code=%d)", status_code);

                if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
                        return -1;
        } else {
                wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
                           "packet_type %d", frame->packet_type);
                return -1;
        }

        return 0;
}


static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
                                   struct wpa_ft_pmk_r0_sa *pmk_r0,
                                   struct ft_remote_r1kh *r1kh,
                                   const u8 *s1kh_id, int pairwise)
{
        struct ft_r0kh_r1kh_push_frame frame, f;
        struct os_time now;

        os_memset(&frame, 0, sizeof(frame));
        frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
        frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH;
        frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN);
        os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);

        /* aes_wrap() does not support inplace encryption, so use a temporary
         * buffer for the data. */
        os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
        os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
        os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
        wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
                          s1kh_id, f.pmk_r1, f.pmk_r1_name);
        wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
        wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
        wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
                    WPA_PMK_NAME_LEN);
        os_get_time(&now);
        WPA_PUT_LE32(f.timestamp, now.sec);
        f.pairwise = pairwise;
        if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
                     f.timestamp, frame.timestamp) < 0)
                return;

        wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame));
}


void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
{
        struct wpa_ft_pmk_r0_sa *r0;
        struct ft_remote_r1kh *r1kh;

        if (!wpa_auth->conf.pmk_r1_push)
                return;

        r0 = wpa_auth->ft_pmk_cache->pmk_r0;
        while (r0) {
                if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
                        break;
                r0 = r0->next;
        }

        if (r0 == NULL || r0->pmk_r1_pushed)
                return;
        r0->pmk_r1_pushed = 1;

        wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
                   "for STA " MACSTR, MAC2STR(addr));

        r1kh = wpa_auth->conf.r1kh_list;
        while (r1kh) {
                wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise);
                r1kh = r1kh->next;
        }
}

#endif /* CONFIG_IEEE80211R */