/src/hostap/src/ap/wpa_auth_ft.c

Source
/*
 * hostapd - IEEE 802.11r - Fast BSS Transition
 * Copyright (c) 2004-2018, Jouni Malinen <j@w1.fi>
 *
 * 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 "utils/list.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "common/ocv.h"
#include "common/wpa_ctrl.h"
#include "drivers/driver.h"
#include "crypto/aes.h"
#include "crypto/aes_siv.h"
#include "crypto/aes_wrap.h"
#include "crypto/sha384.h"
#include "crypto/sha512.h"
#include "crypto/random.h"
#include "ap_config.h"
#include "ieee802_11.h"
#include "wmm.h"
#include "wpa_auth.h"
#include "wpa_auth_i.h"
#include "pmksa_cache_auth.h"


#ifdef CONFIG_IEEE80211R_AP

const unsigned int ftRRBseqTimeout = 10;
const unsigned int ftRRBmaxQueueLen = 100;

/* TODO: make these configurable */
static const int dot11RSNAConfigPMKLifetime = 43200;


static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
             const u8 *current_ap, const u8 *sta_addr,
             u16 status, const u8 *resp_ies,
             size_t resp_ies_len);
static void ft_finish_pull(struct wpa_state_machine *sm);
static void wpa_ft_expire_pull(void *eloop_ctx, void *timeout_ctx);
static void wpa_ft_rrb_seq_timeout(void *eloop_ctx, void *timeout_ctx);

struct tlv_list {
  u16 type;
  size_t len;
  const u8 *data;
};


/**
 * wpa_ft_rrb_decrypt - Decrypt FT RRB message
 * @key: AES-SIV key for AEAD
 * @key_len: Length of key in octets
 * @enc: Pointer to encrypted TLVs
 * @enc_len: Length of encrypted TLVs in octets
 * @auth: Pointer to authenticated TLVs
 * @auth_len: Length of authenticated TLVs in octets
 * @src_addr: MAC address of the frame sender
 * @type: Vendor-specific subtype of the RRB frame (FT_PACKET_*)
 * @plain: Pointer to return the pointer to the allocated plaintext buffer;
 *  needs to be freed by the caller if not NULL;
 *  will only be returned on success
 * @plain_len: Pointer to return the length of the allocated plaintext buffer
 *  in octets
 * Returns: 0 on success, -1 on error
 */
static int wpa_ft_rrb_decrypt(const u8 *key, const size_t key_len,
            const u8 *enc, size_t enc_len,
            const u8 *auth, const size_t auth_len,
            const u8 *src_addr, u8 type,
            u8 **plain, size_t *plain_size)
{
  const u8 *ad[3] = { src_addr, auth, &type };
  size_t ad_len[3] = { ETH_ALEN, auth_len, sizeof(type) };

  wpa_printf(MSG_DEBUG, "FT(RRB): src_addr=" MACSTR " type=%u",
       MAC2STR(src_addr), type);
  wpa_hexdump_key(MSG_DEBUG, "FT(RRB): decrypt using key", key, key_len);
  wpa_hexdump(MSG_DEBUG, "FT(RRB): encrypted TLVs", enc, enc_len);
  wpa_hexdump(MSG_DEBUG, "FT(RRB): authenticated TLVs", auth, auth_len);

  if (!key) { /* skip decryption */
    *plain = os_memdup(enc, enc_len);
    if (enc_len > 0 && !*plain)
      goto err;

    *plain_size = enc_len;

    return 0;
  }

  *plain = NULL;

  /* SIV overhead */
  if (enc_len < AES_BLOCK_SIZE)
    goto err;

  *plain = os_zalloc(enc_len - AES_BLOCK_SIZE);
  if (!*plain)
    goto err;

  if (aes_siv_decrypt(key, key_len, enc, enc_len, 3, ad, ad_len,
          *plain) < 0) {
    if (enc_len < AES_BLOCK_SIZE + 2)
      goto err;

    /* Try to work around Ethernet devices that add extra
     * two octet padding even if the frame is longer than
     * the minimum Ethernet frame. */
    enc_len -= 2;
    if (aes_siv_decrypt(key, key_len, enc, enc_len, 3, ad, ad_len,
            *plain) < 0)
      goto err;
  }

  *plain_size = enc_len - AES_BLOCK_SIZE;
  wpa_hexdump_key(MSG_DEBUG, "FT(RRB): decrypted TLVs",
      *plain, *plain_size);
  return 0;
err:
  os_free(*plain);
  *plain = NULL;
  *plain_size = 0;

  wpa_printf(MSG_ERROR, "FT(RRB): Failed to decrypt");

  return -1;
}


/* get first tlv record in packet matching type
 * @data (decrypted) packet
 * @return 0 on success else -1
 */
static int wpa_ft_rrb_get_tlv(const u8 *plain, size_t plain_len,
            u16 type, size_t *tlv_len, const u8 **tlv_data)
{
  const struct ft_rrb_tlv *f;
  size_t left;
  le16 type16;
  size_t len;

  left = plain_len;
  type16 = host_to_le16(type);

  while (left >= sizeof(*f)) {
    f = (const struct ft_rrb_tlv *) plain;

    left -= sizeof(*f);
    plain += sizeof(*f);
    len = le_to_host16(f->len);

    if (left < len) {
      wpa_printf(MSG_DEBUG, "FT: RRB message truncated");
      break;
    }

    if (f->type == type16) {
      *tlv_len = len;
      *tlv_data = plain;
      return 0;
    }

    left -= len;
    plain += len;
  }

  return -1;
}


static void wpa_ft_rrb_dump(const u8 *plain, const size_t plain_len)
{
  const struct ft_rrb_tlv *f;
  size_t left;
  size_t len;

  left = plain_len;

  wpa_printf(MSG_DEBUG, "FT: RRB dump message");
  while (left >= sizeof(*f)) {
    f = (const struct ft_rrb_tlv *) plain;

    left -= sizeof(*f);
    plain += sizeof(*f);
    len = le_to_host16(f->len);

    wpa_printf(MSG_DEBUG, "FT: RRB TLV type = %d, len = %zu",
         le_to_host16(f->type), len);

    if (left < len) {
      wpa_printf(MSG_DEBUG,
           "FT: RRB message truncated: left %zu bytes, need %zu",
           left, len);
      break;
    }

    wpa_hexdump(MSG_DEBUG, "FT: RRB TLV data", plain, len);

    left -= len;
    plain += len;
  }

  if (left > 0)
    wpa_hexdump(MSG_DEBUG, "FT: RRB TLV padding", plain, left);

  wpa_printf(MSG_DEBUG, "FT: RRB dump message end");
}


static int cmp_int(const void *a, const void *b)
{
  int x, y;

  x = *((int *) a);
  y = *((int *) b);
  return x - y;
}


static int wpa_ft_rrb_get_tlv_vlan(const u8 *plain, const size_t plain_len,
           struct vlan_description *vlan)
{
  struct ft_rrb_tlv *f;
  size_t left;
  size_t len;
  int taggedidx;
  int vlan_id;
  int type;

  left = plain_len;
  taggedidx = 0;
  os_memset(vlan, 0, sizeof(*vlan));

  while (left >= sizeof(*f)) {
    f = (struct ft_rrb_tlv *) plain;

    left -= sizeof(*f);
    plain += sizeof(*f);

    len = le_to_host16(f->len);
    type = le_to_host16(f->type);

    if (left < len) {
      wpa_printf(MSG_DEBUG, "FT: RRB message truncated");
      return -1;
    }

    if (type != FT_RRB_VLAN_UNTAGGED && type != FT_RRB_VLAN_TAGGED)
      goto skip;

    if (type == FT_RRB_VLAN_UNTAGGED && len != sizeof(le16)) {
      wpa_printf(MSG_DEBUG,
           "FT: RRB VLAN_UNTAGGED invalid length");
      return -1;
    }

    if (type == FT_RRB_VLAN_TAGGED && len % sizeof(le16) != 0) {
      wpa_printf(MSG_DEBUG,
           "FT: RRB VLAN_TAGGED invalid length");
      return -1;
    }

    while (len >= sizeof(le16)) {
      vlan_id = WPA_GET_LE16(plain);
      plain += sizeof(le16);
      left -= sizeof(le16);
      len -= sizeof(le16);

      if (vlan_id <= 0 || vlan_id > MAX_VLAN_ID) {
        wpa_printf(MSG_DEBUG,
             "FT: RRB VLAN ID invalid %d",
             vlan_id);
        continue;
      }

      if (type == FT_RRB_VLAN_UNTAGGED)
        vlan->untagged = vlan_id;

      if (type == FT_RRB_VLAN_TAGGED &&
          taggedidx < MAX_NUM_TAGGED_VLAN) {
        vlan->tagged[taggedidx] = vlan_id;
        taggedidx++;
      } else if (type == FT_RRB_VLAN_TAGGED) {
        wpa_printf(MSG_DEBUG, "FT: RRB too many VLANs");
      }
    }

  skip:
    left -= len;
    plain += len;
  }

  if (taggedidx)
    qsort(vlan->tagged, taggedidx, sizeof(int), cmp_int);

  vlan->notempty = vlan->untagged || vlan->tagged[0];

  return 0;
}


static size_t wpa_ft_tlv_len(const struct tlv_list *tlvs)
{
  size_t tlv_len = 0;
  int i;

  if (!tlvs)
    return 0;

  for (i = 0; tlvs[i].type != FT_RRB_LAST_EMPTY; i++) {
    tlv_len += sizeof(struct ft_rrb_tlv);
    tlv_len += tlvs[i].len;
  }

  return tlv_len;
}


static size_t wpa_ft_tlv_lin(const struct tlv_list *tlvs, u8 *start,
           u8 *endpos)
{
  int i;
  size_t tlv_len;
  struct ft_rrb_tlv *hdr;
  u8 *pos;

  if (!tlvs)
    return 0;

  tlv_len = 0;
  pos = start;
  for (i = 0; tlvs[i].type != FT_RRB_LAST_EMPTY; i++) {
    if (tlv_len + sizeof(*hdr) > (size_t) (endpos - start))
      return tlv_len;
    tlv_len += sizeof(*hdr);
    hdr = (struct ft_rrb_tlv *) pos;
    hdr->type = host_to_le16(tlvs[i].type);
    hdr->len = host_to_le16(tlvs[i].len);
    pos = start + tlv_len;

    if (tlv_len + tlvs[i].len > (size_t) (endpos - start))
      return tlv_len;
    if (tlvs[i].len == 0)
      continue;
    tlv_len += tlvs[i].len;
    os_memcpy(pos, tlvs[i].data, tlvs[i].len);
    pos = start + tlv_len;
  }

  return tlv_len;
}


static size_t wpa_ft_vlan_len(const struct vlan_description *vlan)
{
  size_t tlv_len = 0;
  int i;

  if (!vlan || !vlan->notempty)
    return 0;

  if (vlan->untagged) {
    tlv_len += sizeof(struct ft_rrb_tlv);
    tlv_len += sizeof(le16);
  }
  if (vlan->tagged[0])
    tlv_len += sizeof(struct ft_rrb_tlv);
  for (i = 0; i < MAX_NUM_TAGGED_VLAN && vlan->tagged[i]; i++)
    tlv_len += sizeof(le16);

  return tlv_len;
}


static size_t wpa_ft_vlan_lin(const struct vlan_description *vlan,
            u8 *start, u8 *endpos)
{
  size_t tlv_len;
  int i, len;
  struct ft_rrb_tlv *hdr;
  u8 *pos = start;

  if (!vlan || !vlan->notempty)
    return 0;

  tlv_len = 0;
  if (vlan->untagged) {
    tlv_len += sizeof(*hdr);
    if (start + tlv_len > endpos)
      return tlv_len;
    hdr = (struct ft_rrb_tlv *) pos;
    hdr->type = host_to_le16(FT_RRB_VLAN_UNTAGGED);
    hdr->len = host_to_le16(sizeof(le16));
    pos = start + tlv_len;

    tlv_len += sizeof(le16);
    if (start + tlv_len > endpos)
      return tlv_len;
    WPA_PUT_LE16(pos, vlan->untagged);
    pos = start + tlv_len;
  }

  if (!vlan->tagged[0])
    return tlv_len;

  tlv_len += sizeof(*hdr);
  if (start + tlv_len > endpos)
    return tlv_len;
  hdr = (struct ft_rrb_tlv *) pos;
  hdr->type = host_to_le16(FT_RRB_VLAN_TAGGED);
  len = 0; /* len is computed below */
  pos = start + tlv_len;

  for (i = 0; i < MAX_NUM_TAGGED_VLAN && vlan->tagged[i]; i++) {
    tlv_len += sizeof(le16);
    if (start + tlv_len > endpos)
      break;
    len += sizeof(le16);
    WPA_PUT_LE16(pos, vlan->tagged[i]);
    pos = start + tlv_len;
  }

  hdr->len = host_to_le16(len);

  return tlv_len;
}


static int wpa_ft_rrb_lin(const struct tlv_list *tlvs1,
        const struct tlv_list *tlvs2,
        const struct vlan_description *vlan,
        u8 **plain, size_t *plain_len)
{
  u8 *pos, *endpos;
  size_t tlv_len;

  tlv_len = wpa_ft_tlv_len(tlvs1);
  tlv_len += wpa_ft_tlv_len(tlvs2);
  tlv_len += wpa_ft_vlan_len(vlan);

  *plain_len = tlv_len;
  *plain = os_zalloc(tlv_len);
  if (!*plain) {
    wpa_printf(MSG_ERROR, "FT: Failed to allocate plaintext");
    goto err;
  }

  pos = *plain;
  endpos = *plain + tlv_len;
  pos += wpa_ft_tlv_lin(tlvs1, pos, endpos);
  pos += wpa_ft_tlv_lin(tlvs2, pos, endpos);
  pos += wpa_ft_vlan_lin(vlan, pos, endpos);

  /* validity check */
  if (pos != endpos) {
    wpa_printf(MSG_ERROR, "FT: Length error building RRB");
    goto err;
  }

  return 0;

err:
  os_free(*plain);
  *plain = NULL;
  *plain_len = 0;
  return -1;
}


static int wpa_ft_rrb_encrypt(const u8 *key, const size_t key_len,
            const u8 *plain, const size_t plain_len,
            const u8 *auth, const size_t auth_len,
            const u8 *src_addr, u8 type, u8 *enc)
{
  const u8 *ad[3] = { src_addr, auth, &type };
  size_t ad_len[3] = { ETH_ALEN, auth_len, sizeof(type) };

  wpa_printf(MSG_DEBUG, "FT(RRB): src_addr=" MACSTR " type=%u",
       MAC2STR(src_addr), type);
  wpa_hexdump_key(MSG_DEBUG, "FT(RRB): plaintext message",
      plain, plain_len);
  wpa_hexdump_key(MSG_DEBUG, "FT(RRB): encrypt using key", key, key_len);
  wpa_hexdump(MSG_DEBUG, "FT(RRB): authenticated TLVs", auth, auth_len);

  if (!key) {
    /* encryption not needed, return plaintext as packet */
    os_memcpy(enc, plain, plain_len);
  } else if (aes_siv_encrypt(key, key_len, plain, plain_len,
           3, ad, ad_len, enc) < 0) {
    wpa_printf(MSG_ERROR, "FT: Failed to encrypt RRB-OUI message");
    return -1;
  }
  wpa_hexdump(MSG_DEBUG, "FT(RRB): encrypted TLVs",
        enc, plain_len + AES_BLOCK_SIZE);

  return 0;
}


/**
 * wpa_ft_rrb_build - Build and encrypt an FT RRB message
 * @key: AES-SIV key for AEAD
 * @key_len: Length of key in octets
 * @tlvs_enc0: First set of to-be-encrypted TLVs
 * @tlvs_enc1: Second set of to-be-encrypted TLVs
 * @tlvs_auth: Set of to-be-authenticated TLVs
 * @src_addr: MAC address of the frame sender
 * @type: Vendor-specific subtype of the RRB frame (FT_PACKET_*)
 * @packet Pointer to return the pointer to the allocated packet buffer;
 *         needs to be freed by the caller if not null;
 *         will only be returned on success
 * @packet_len: Pointer to return the length of the allocated buffer in octets
 * Returns: 0 on success, -1 on error
 */
static int wpa_ft_rrb_build(const u8 *key, const size_t key_len,
          const struct tlv_list *tlvs_enc0,
          const struct tlv_list *tlvs_enc1,
          const struct tlv_list *tlvs_auth,
          const struct vlan_description *vlan,
          const u8 *src_addr, u8 type,
          u8 **packet, size_t *packet_len)
{
  u8 *plain = NULL, *auth = NULL, *pos, *tmp;
  size_t plain_len = 0, auth_len = 0;
  int ret = -1;
  size_t pad_len = 0;

  *packet = NULL;
  if (wpa_ft_rrb_lin(tlvs_enc0, tlvs_enc1, vlan, &plain, &plain_len) < 0)
    goto out;

  if (wpa_ft_rrb_lin(tlvs_auth, NULL, NULL, &auth, &auth_len) < 0)
    goto out;

  *packet_len = sizeof(u16) + auth_len + plain_len;
  if (key)
    *packet_len += AES_BLOCK_SIZE;
#define RRB_MIN_MSG_LEN 64
  if (*packet_len < RRB_MIN_MSG_LEN) {
    pad_len = RRB_MIN_MSG_LEN - *packet_len;
    if (pad_len < sizeof(struct ft_rrb_tlv))
      pad_len = sizeof(struct ft_rrb_tlv);
    wpa_printf(MSG_DEBUG,
         "FT: Pad message to minimum Ethernet frame length (%d --> %d)",
         (int) *packet_len, (int) (*packet_len + pad_len));
    *packet_len += pad_len;
    tmp = os_realloc(auth, auth_len + pad_len);
    if (!tmp)
      goto out;
    auth = tmp;
    pos = auth + auth_len;
    WPA_PUT_LE16(pos, FT_RRB_LAST_EMPTY);
    pos += 2;
    WPA_PUT_LE16(pos, pad_len - sizeof(struct ft_rrb_tlv));
    pos += 2;
    os_memset(pos, 0, pad_len - sizeof(struct ft_rrb_tlv));
    auth_len += pad_len;

  }
  *packet = os_zalloc(*packet_len);
  if (!*packet)
    goto out;

  pos = *packet;
  WPA_PUT_LE16(pos, auth_len);
  pos += 2;
  os_memcpy(pos, auth, auth_len);
  pos += auth_len;
  if (wpa_ft_rrb_encrypt(key, key_len, plain, plain_len, auth,
             auth_len, src_addr, type, pos) < 0)
    goto out;
  wpa_hexdump(MSG_MSGDUMP, "FT: RRB frame payload", *packet, *packet_len);

  ret = 0;

out:
  bin_clear_free(plain, plain_len);
  os_free(auth);

  if (ret) {
    wpa_printf(MSG_ERROR, "FT: Failed to build RRB-OUI message");
    os_free(*packet);
    *packet = NULL;
    *packet_len = 0;
  }

  return ret;
}


#define RRB_GET_SRC(srcfield, type, field, txt, checklength) do { \
  if (wpa_ft_rrb_get_tlv(srcfield, srcfield##_len, type, \
        &f_##field##_len, &f_##field) < 0 || \
      (checklength > 0 && ((size_t) checklength) != f_##field##_len)) { \
    wpa_printf(MSG_INFO, "FT: Missing required " #field \
         " in %s from " MACSTR, txt, MAC2STR(src_addr)); \
    wpa_ft_rrb_dump(srcfield, srcfield##_len); \
    goto out; \
  } \
} while (0)

#define RRB_GET(type, field, txt, checklength) \
  RRB_GET_SRC(plain, type, field, txt, checklength)
#define RRB_GET_AUTH(type, field, txt, checklength) \
  RRB_GET_SRC(auth, type, field, txt, checklength)

#define RRB_GET_OPTIONAL_SRC(srcfield, type, field, txt, checklength) do { \
  if (wpa_ft_rrb_get_tlv(srcfield, srcfield##_len, type, \
        &f_##field##_len, &f_##field) < 0 || \
      (checklength > 0 && ((size_t) checklength) != f_##field##_len)) { \
    wpa_printf(MSG_DEBUG, "FT: Missing optional " #field \
         " in %s from " MACSTR, txt, MAC2STR(src_addr)); \
    f_##field##_len = 0; \
    f_##field = NULL; \
  } \
} while (0)

#define RRB_GET_OPTIONAL(type, field, txt, checklength) \
  RRB_GET_OPTIONAL_SRC(plain, type, field, txt, checklength)
#define RRB_GET_OPTIONAL_AUTH(type, field, txt, checklength) \
  RRB_GET_OPTIONAL_SRC(auth, type, field, txt, checklength)

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;
  wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst));
  return wpa_auth->cb->send_ether(wpa_auth->cb_ctx, dst, ETH_P_RRB,
          data, data_len);
}


static int wpa_ft_rrb_oui_send(struct wpa_authenticator *wpa_auth,
             const u8 *dst, u8 oui_suffix,
             const u8 *data, size_t data_len)
{
  if (!wpa_auth->cb->send_oui)
    return -1;
  wpa_printf(MSG_DEBUG, "FT: RRB-OUI type %u send to " MACSTR " (len=%u)",
       oui_suffix, MAC2STR(dst), (unsigned int) data_len);
  return wpa_auth->cb->send_oui(wpa_auth->cb_ctx, dst, oui_suffix, 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 const u8 * wpa_ft_get_psk(struct wpa_authenticator *wpa_auth,
         const u8 *addr, const u8 *p2p_dev_addr,
         const u8 *prev_psk)
{
  if (wpa_auth->cb->get_psk == NULL)
    return NULL;
  return wpa_auth->cb->get_psk(wpa_auth->cb_ctx, addr, p2p_dev_addr,
             prev_psk, NULL, NULL);
}


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);
}


static int wpa_ft_set_vlan(struct wpa_authenticator *wpa_auth,
         const u8 *sta_addr, struct vlan_description *vlan)
{
  if (!wpa_auth->cb->set_vlan)
    return -1;
  return wpa_auth->cb->set_vlan(wpa_auth->cb_ctx, sta_addr, vlan);
}


static int wpa_ft_get_vlan(struct wpa_authenticator *wpa_auth,
         const u8 *sta_addr, struct vlan_description *vlan)
{
  if (!wpa_auth->cb->get_vlan)
    return -1;
  return wpa_auth->cb->get_vlan(wpa_auth->cb_ctx, sta_addr, vlan);
}


static int
wpa_ft_set_identity(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
        const u8 *identity, size_t identity_len)
{
  if (!wpa_auth->cb->set_identity)
    return -1;
  return wpa_auth->cb->set_identity(wpa_auth->cb_ctx, sta_addr, identity,
            identity_len);
}


static size_t
wpa_ft_get_identity(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
        const u8 **buf)
{
  *buf = NULL;
  if (!wpa_auth->cb->get_identity)
    return 0;
  return wpa_auth->cb->get_identity(wpa_auth->cb_ctx, sta_addr, buf);
}


static int
wpa_ft_set_radius_cui(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
          const u8 *radius_cui, size_t radius_cui_len)
{
  if (!wpa_auth->cb->set_radius_cui)
    return -1;
  return wpa_auth->cb->set_radius_cui(wpa_auth->cb_ctx, sta_addr,
              radius_cui, radius_cui_len);
}


static size_t
wpa_ft_get_radius_cui(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
          const u8 **buf)
{
  *buf = NULL;
  if (!wpa_auth->cb->get_radius_cui)
    return 0;
  return wpa_auth->cb->get_radius_cui(wpa_auth->cb_ctx, sta_addr, buf);
}


static void
wpa_ft_set_session_timeout(struct wpa_authenticator *wpa_auth,
          const u8 *sta_addr, int session_timeout)
{
  if (!wpa_auth->cb->set_session_timeout)
    return;
  wpa_auth->cb->set_session_timeout(wpa_auth->cb_ctx, sta_addr,
            session_timeout);
}


static int
wpa_ft_get_session_timeout(struct wpa_authenticator *wpa_auth,
          const u8 *sta_addr)
{
  if (!wpa_auth->cb->get_session_timeout)
    return 0;
  return wpa_auth->cb->get_session_timeout(wpa_auth->cb_ctx, sta_addr);
}


#ifdef CONFIG_OCV
static int wpa_channel_info(struct wpa_authenticator *wpa_auth,
             struct wpa_channel_info *ci)
{
  if (!wpa_auth->cb->channel_info)
    return -1;
  return wpa_auth->cb->channel_info(wpa_auth->cb_ctx, ci);
}
#endif /* CONFIG_OCV */


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 = 0;
  if (conf->ft_over_ds)
    capab |= RSN_FT_CAPAB_FT_OVER_DS;
  *pos++ = capab;

  return pos - buf;
}


int wpa_write_ftie(struct wpa_auth_config *conf, int key_mgmt, size_t key_len,
       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, int rsnxe_used)
{
  u8 *pos = buf, *ielen;
  size_t hdrlen;
  u16 mic_control = rsnxe_used ? FTE_MIC_CTRL_RSNXE_USED : 0;

  if (key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
      key_len == SHA256_MAC_LEN)
    hdrlen = sizeof(struct rsn_ftie);
  else if (key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
     key_len == SHA384_MAC_LEN)
    hdrlen = sizeof(struct rsn_ftie_sha384);
  else if (key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
     key_len == SHA512_MAC_LEN)
    hdrlen = sizeof(struct rsn_ftie_sha512);
  else if (wpa_key_mgmt_sha384(key_mgmt))
    hdrlen = sizeof(struct rsn_ftie_sha384);
  else
    hdrlen = sizeof(struct rsn_ftie);

  if (len < 2 + hdrlen + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
      subelem_len)
    return -1;

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

  if (key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
      key_len == SHA512_MAC_LEN) {
    struct rsn_ftie_sha512 *hdr = (struct rsn_ftie_sha512 *) pos;

    os_memset(hdr, 0, sizeof(*hdr));
    pos += sizeof(*hdr);
    mic_control |= FTE_MIC_LEN_32 << FTE_MIC_CTRL_MIC_LEN_SHIFT;
    WPA_PUT_LE16(hdr->mic_control, mic_control);
    if (anonce)
      os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
    if (snonce)
      os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
  } else if ((key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
        key_len == SHA384_MAC_LEN) ||
       wpa_key_mgmt_sha384(key_mgmt)) {
    struct rsn_ftie_sha384 *hdr = (struct rsn_ftie_sha384 *) pos;

    os_memset(hdr, 0, sizeof(*hdr));
    pos += sizeof(*hdr);
    mic_control |= FTE_MIC_LEN_24 << FTE_MIC_CTRL_MIC_LEN_SHIFT;
    WPA_PUT_LE16(hdr->mic_control, mic_control);
    if (anonce)
      os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
    if (snonce)
      os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
  } else {
    struct rsn_ftie *hdr = (struct rsn_ftie *) pos;

    os_memset(hdr, 0, sizeof(*hdr));
    pos += sizeof(*hdr);
    mic_control |= FTE_MIC_LEN_16 << FTE_MIC_CTRL_MIC_LEN_SHIFT;
    WPA_PUT_LE16(hdr->mic_control, mic_control);
    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;
}


/* A packet to be handled after seq response */
struct ft_remote_item {
  struct dl_list list;

  u8 nonce[FT_RRB_NONCE_LEN];
  struct os_reltime nonce_ts;

  u8 src_addr[ETH_ALEN];
  u8 *enc;
  size_t enc_len;
  u8 *auth;
  size_t auth_len;
  int (*cb)(struct wpa_authenticator *wpa_auth,
      const u8 *src_addr,
      const u8 *enc, size_t enc_len,
      const u8 *auth, size_t auth_len,
      int no_defer);
};


static void wpa_ft_rrb_seq_free(struct ft_remote_item *item)
{
  eloop_cancel_timeout(wpa_ft_rrb_seq_timeout, ELOOP_ALL_CTX, item);
  dl_list_del(&item->list);
  bin_clear_free(item->enc, item->enc_len);
  os_free(item->auth);
  os_free(item);
}


static void wpa_ft_rrb_seq_flush(struct wpa_authenticator *wpa_auth,
         struct ft_remote_seq *rkh_seq, int cb)
{
  struct ft_remote_item *item, *n;

  dl_list_for_each_safe(item, n, &rkh_seq->rx.queue,
            struct ft_remote_item, list) {
    if (cb && item->cb)
      item->cb(wpa_auth, item->src_addr, item->enc,
         item->enc_len, item->auth, item->auth_len, 1);
    wpa_ft_rrb_seq_free(item);
  }
}


static void wpa_ft_rrb_seq_timeout(void *eloop_ctx, void *timeout_ctx)
{
  struct ft_remote_item *item = timeout_ctx;

  wpa_ft_rrb_seq_free(item);
}


static int
wpa_ft_rrb_seq_req(struct wpa_authenticator *wpa_auth,
       struct ft_remote_seq *rkh_seq, const u8 *src_addr,
       const u8 *f_r0kh_id, size_t f_r0kh_id_len,
       const u8 *f_r1kh_id, const u8 *key, size_t key_len,
       const u8 *enc, size_t enc_len,
       const u8 *auth, size_t auth_len,
       int (*cb)(struct wpa_authenticator *wpa_auth,
           const u8 *src_addr,
           const u8 *enc, size_t enc_len,
           const u8 *auth, size_t auth_len,
           int no_defer))
{
  struct ft_remote_item *item = NULL;
  u8 *packet = NULL;
  size_t packet_len;
  struct tlv_list seq_req_auth[] = {
    { .type = FT_RRB_NONCE, .len = FT_RRB_NONCE_LEN,
      .data = NULL /* to be filled: item->nonce */ },
    { .type = FT_RRB_R0KH_ID, .len = f_r0kh_id_len,
      .data = f_r0kh_id },
    { .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
      .data = f_r1kh_id },
    { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
  };

  if (dl_list_len(&rkh_seq->rx.queue) >= ftRRBmaxQueueLen) {
    wpa_printf(MSG_DEBUG, "FT: Sequence number queue too long");
    goto err;
  }

  wpa_printf(MSG_DEBUG, "FT: Send sequence number request from " MACSTR
       " to " MACSTR,
       MAC2STR(wpa_auth->addr), MAC2STR(src_addr));
  item = os_zalloc(sizeof(*item));
  if (!item)
    goto err;

  os_memcpy(item->src_addr, src_addr, ETH_ALEN);
  item->cb = cb;

  if (random_get_bytes(item->nonce, FT_RRB_NONCE_LEN) < 0) {
    wpa_printf(MSG_DEBUG, "FT: Seq num nonce: out of random bytes");
    goto err;
  }

  if (os_get_reltime(&item->nonce_ts) < 0)
    goto err;

  if (enc && enc_len > 0) {
    item->enc = os_memdup(enc, enc_len);
    item->enc_len = enc_len;
    if (!item->enc)
      goto err;
  }

  if (auth && auth_len > 0) {
    item->auth = os_memdup(auth, auth_len);
    item->auth_len = auth_len;
    if (!item->auth)
      goto err;
  }

  eloop_register_timeout(ftRRBseqTimeout, 0, wpa_ft_rrb_seq_timeout,
             wpa_auth, item);

  seq_req_auth[0].data = item->nonce;

  if (wpa_ft_rrb_build(key, key_len, NULL, NULL, seq_req_auth, NULL,
           wpa_auth->addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
           &packet, &packet_len) < 0) {
    item = NULL; /* some other seq resp might still accept this */
    goto err;
  }

  dl_list_add(&rkh_seq->rx.queue, &item->list);

  wpa_ft_rrb_oui_send(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
          packet, packet_len);

  os_free(packet);

  return 0;
err:
  wpa_printf(MSG_DEBUG, "FT: Failed to send sequence number request");
  if (item) {
    os_free(item->auth);
    bin_clear_free(item->enc, item->enc_len);
    os_free(item);
  }

  return -1;
}


#define FT_RRB_SEQ_OK    0
#define FT_RRB_SEQ_DROP  1
#define FT_RRB_SEQ_DEFER 2

static int
wpa_ft_rrb_seq_chk(struct ft_remote_seq *rkh_seq, const u8 *src_addr,
       const u8 *enc, size_t enc_len,
       const u8 *auth, size_t auth_len,
       const char *msgtype, int no_defer)
{
  const u8 *f_seq;
  size_t f_seq_len;
  const struct ft_rrb_seq *msg_both;
  u32 msg_seq, msg_off, rkh_off;
  struct os_reltime now;
  unsigned int i;

  RRB_GET_AUTH(FT_RRB_SEQ, seq, msgtype, sizeof(*msg_both));
  wpa_hexdump(MSG_DEBUG, "FT: sequence number", f_seq, f_seq_len);
  msg_both = (const struct ft_rrb_seq *) f_seq;

  if (rkh_seq->rx.num_last == 0) {
    /* first packet from remote */
    goto defer;
  }

  if (le_to_host32(msg_both->dom) != rkh_seq->rx.dom) {
    /* remote might have rebooted */
    goto defer;
  }

  if (os_get_reltime(&now) == 0) {
    u32 msg_ts_now_remote, msg_ts_off;
    struct os_reltime now_remote;

    os_reltime_sub(&now, &rkh_seq->rx.time_offset, &now_remote);
    msg_ts_now_remote = now_remote.sec;
    msg_ts_off = le_to_host32(msg_both->ts) -
      (msg_ts_now_remote - ftRRBseqTimeout);
    if (msg_ts_off > 2 * ftRRBseqTimeout)
      goto defer;
  }

  msg_seq = le_to_host32(msg_both->seq);
  rkh_off = rkh_seq->rx.last[rkh_seq->rx.offsetidx];
  msg_off = msg_seq - rkh_off;
  if (msg_off > 0xC0000000)
    goto out; /* too old message, drop it */

  if (msg_off <= 0x40000000) {
    for (i = 0; i < rkh_seq->rx.num_last; i++) {
      if (rkh_seq->rx.last[i] == msg_seq)
        goto out; /* duplicate message, drop it */
    }

    return FT_RRB_SEQ_OK;
  }

defer:
  if (no_defer)
    goto out;

  wpa_printf(MSG_DEBUG, "FT: Possibly invalid sequence number in %s from "
       MACSTR, msgtype, MAC2STR(src_addr));

  return FT_RRB_SEQ_DEFER;
out:
  wpa_printf(MSG_DEBUG, "FT: Invalid sequence number in %s from " MACSTR,
       msgtype, MAC2STR(src_addr));

  return FT_RRB_SEQ_DROP;
}


static void
wpa_ft_rrb_seq_accept(struct wpa_authenticator *wpa_auth,
          struct ft_remote_seq *rkh_seq, const u8 *src_addr,
          const u8 *auth, size_t auth_len,
          const char *msgtype)
{
  const u8 *f_seq;
  size_t f_seq_len;
  const struct ft_rrb_seq *msg_both;
  u32 msg_seq, msg_off, min_off, rkh_off;
  int minidx = 0;
  unsigned int i;

  RRB_GET_AUTH(FT_RRB_SEQ, seq, msgtype, sizeof(*msg_both));
  msg_both = (const struct ft_rrb_seq *) f_seq;

  msg_seq = le_to_host32(msg_both->seq);

  if (rkh_seq->rx.num_last < FT_REMOTE_SEQ_BACKLOG) {
    rkh_seq->rx.last[rkh_seq->rx.num_last] = msg_seq;
    rkh_seq->rx.num_last++;
    return;
  }

  rkh_off = rkh_seq->rx.last[rkh_seq->rx.offsetidx];
  for (i = 0; i < rkh_seq->rx.num_last; i++) {
    msg_off = rkh_seq->rx.last[i] - rkh_off;
    min_off = rkh_seq->rx.last[minidx] - rkh_off;
    if (msg_off < min_off && i != rkh_seq->rx.offsetidx)
      minidx = i;
  }
  rkh_seq->rx.last[rkh_seq->rx.offsetidx] = msg_seq;
  rkh_seq->rx.offsetidx = minidx;

  return;
out:
  /* RRB_GET_AUTH should never fail here as
   * wpa_ft_rrb_seq_chk() verified FT_RRB_SEQ presence. */
  wpa_printf(MSG_ERROR, "FT: %s() failed", __func__);
}


static int wpa_ft_new_seq(struct ft_remote_seq *rkh_seq,
        struct ft_rrb_seq *f_seq)
{
  struct os_reltime now;

  if (os_get_reltime(&now) < 0)
    return -1;

  if (!rkh_seq->tx.dom) {
    if (random_get_bytes((u8 *) &rkh_seq->tx.seq,
             sizeof(rkh_seq->tx.seq))) {
      wpa_printf(MSG_ERROR,
           "FT: Failed to get random data for sequence number initialization");
      rkh_seq->tx.seq = now.usec;
    }
    if (random_get_bytes((u8 *) &rkh_seq->tx.dom,
             sizeof(rkh_seq->tx.dom))) {
      wpa_printf(MSG_ERROR,
           "FT: Failed to get random data for sequence number initialization");
      rkh_seq->tx.dom = now.usec;
    }
    rkh_seq->tx.dom |= 1;
  }

  f_seq->dom = host_to_le32(rkh_seq->tx.dom);
  f_seq->seq = host_to_le32(rkh_seq->tx.seq);
  f_seq->ts = host_to_le32(now.sec);

  rkh_seq->tx.seq++;

  return 0;
}


struct wpa_ft_pmk_r0_sa {
  struct dl_list list;
  u8 pmk_r0[PMK_LEN_MAX];
  size_t pmk_r0_len;
  u8 pmk_r0_name[WPA_PMK_NAME_LEN];
  u8 spa[ETH_ALEN];
  int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
  struct vlan_description *vlan;
  os_time_t expiration; /* 0 for no expiration */
  u8 *identity;
  size_t identity_len;
  u8 *radius_cui;
  size_t radius_cui_len;
  os_time_t session_timeout; /* 0 for no expiration */
  /* TODO: radius_class, EAP type */
  int pmk_r1_pushed;
};

struct wpa_ft_pmk_r1_sa {
  struct dl_list list;
  u8 pmk_r1[PMK_LEN_MAX];
  size_t pmk_r1_len;
  u8 pmk_r1_name[WPA_PMK_NAME_LEN];
  u8 spa[ETH_ALEN];
  int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
  struct vlan_description *vlan;
  u8 *identity;
  size_t identity_len;
  u8 *radius_cui;
  size_t radius_cui_len;
  os_time_t session_timeout; /* 0 for no expiration */
  /* TODO: radius_class, EAP type */
};

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


static void wpa_ft_expire_pmk_r0(void *eloop_ctx, void *timeout_ctx);
static void wpa_ft_expire_pmk_r1(void *eloop_ctx, void *timeout_ctx);


static void wpa_ft_free_pmk_r0(struct wpa_ft_pmk_r0_sa *r0)
{
  if (!r0)
    return;

  dl_list_del(&r0->list);
  eloop_cancel_timeout(wpa_ft_expire_pmk_r0, r0, NULL);

  os_memset(r0->pmk_r0, 0, PMK_LEN_MAX);
  os_free(r0->vlan);
  os_free(r0->identity);
  os_free(r0->radius_cui);
  os_free(r0);
}


static void wpa_ft_expire_pmk_r0(void *eloop_ctx, void *timeout_ctx)
{
  struct wpa_ft_pmk_r0_sa *r0 = eloop_ctx;
  struct os_reltime now;
  int expires_in;
  int session_timeout;

  os_get_reltime(&now);

  if (!r0)
    return;

  expires_in = r0->expiration - now.sec;
  session_timeout = r0->session_timeout - now.sec;
  /* conditions to remove from cache:
   * a) r0->expiration is set and hit
   * -or-
   * b) r0->session_timeout is set and hit
   */
  if ((!r0->expiration || expires_in > 0) &&
      (!r0->session_timeout || session_timeout > 0)) {
    wpa_printf(MSG_ERROR,
         "FT: %s() called for non-expired entry %p",
         __func__, r0);
    eloop_cancel_timeout(wpa_ft_expire_pmk_r0, r0, NULL);
    if (r0->expiration && expires_in > 0)
      eloop_register_timeout(expires_in + 1, 0,
                 wpa_ft_expire_pmk_r0, r0, NULL);
    if (r0->session_timeout && session_timeout > 0)
      eloop_register_timeout(session_timeout + 1, 0,
                 wpa_ft_expire_pmk_r0, r0, NULL);
    return;
  }

  wpa_ft_free_pmk_r0(r0);
}


static void wpa_ft_free_pmk_r1(struct wpa_ft_pmk_r1_sa *r1)
{
  if (!r1)
    return;

  dl_list_del(&r1->list);
  eloop_cancel_timeout(wpa_ft_expire_pmk_r1, r1, NULL);

  os_memset(r1->pmk_r1, 0, PMK_LEN_MAX);
  os_free(r1->vlan);
  os_free(r1->identity);
  os_free(r1->radius_cui);
  os_free(r1);
}


static void wpa_ft_expire_pmk_r1(void *eloop_ctx, void *timeout_ctx)
{
  struct wpa_ft_pmk_r1_sa *r1 = eloop_ctx;

  wpa_ft_free_pmk_r1(r1);
}


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

  cache = os_zalloc(sizeof(*cache));
  if (cache) {
    dl_list_init(&cache->pmk_r0);
    dl_list_init(&cache->pmk_r1);
  }

  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;

  dl_list_for_each_safe(r0, r0prev, &cache->pmk_r0,
            struct wpa_ft_pmk_r0_sa, list)
    wpa_ft_free_pmk_r0(r0);

  dl_list_for_each_safe(r1, r1prev, &cache->pmk_r1,
            struct wpa_ft_pmk_r1_sa, list)
    wpa_ft_free_pmk_r1(r1);

  os_free(cache);
}


static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
             const u8 *spa, const u8 *pmk_r0,
             size_t pmk_r0_len,
             const u8 *pmk_r0_name, int pairwise,
             const struct vlan_description *vlan,
             int expires_in, int session_timeout,
             const u8 *identity, size_t identity_len,
             const u8 *radius_cui, size_t radius_cui_len)
{
  struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
  struct wpa_ft_pmk_r0_sa *r0;
  struct os_reltime now;

  /* TODO: add limit on number of entries in cache */
  os_get_reltime(&now);

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

  os_memcpy(r0->pmk_r0, pmk_r0, pmk_r0_len);
  r0->pmk_r0_len = pmk_r0_len;
  os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
  os_memcpy(r0->spa, spa, ETH_ALEN);
  r0->pairwise = pairwise;
  if (expires_in > 0)
    r0->expiration = now.sec + expires_in;
  if (vlan && vlan->notempty) {
    r0->vlan = os_zalloc(sizeof(*vlan));
    if (!r0->vlan) {
      bin_clear_free(r0, sizeof(*r0));
      return -1;
    }
    *r0->vlan = *vlan;
  }
  if (identity) {
    r0->identity = os_malloc(identity_len);
    if (r0->identity) {
      os_memcpy(r0->identity, identity, identity_len);
      r0->identity_len = identity_len;
    }
  }
  if (radius_cui) {
    r0->radius_cui = os_malloc(radius_cui_len);
    if (r0->radius_cui) {
      os_memcpy(r0->radius_cui, radius_cui, radius_cui_len);
      r0->radius_cui_len = radius_cui_len;
    }
  }
  if (session_timeout > 0)
    r0->session_timeout = now.sec + session_timeout;

  dl_list_add(&cache->pmk_r0, &r0->list);
  if (expires_in > 0)
    eloop_register_timeout(expires_in + 1, 0, wpa_ft_expire_pmk_r0,
               r0, NULL);
  if (session_timeout > 0)
    eloop_register_timeout(session_timeout + 1, 0,
               wpa_ft_expire_pmk_r0, r0, NULL);

  return 0;
}


static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
             const u8 *spa, const u8 *pmk_r0_name,
             const struct wpa_ft_pmk_r0_sa **r0_out)
{
  struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
  struct wpa_ft_pmk_r0_sa *r0;
  struct os_reltime now;

  os_get_reltime(&now);
  dl_list_for_each(r0, &cache->pmk_r0, struct wpa_ft_pmk_r0_sa, list) {
    if (ether_addr_equal(r0->spa, spa) &&
        os_memcmp_const(r0->pmk_r0_name, pmk_r0_name,
            WPA_PMK_NAME_LEN) == 0) {
      *r0_out = r0;
      return 0;
    }
  }

  *r0_out = NULL;
  return -1;
}


static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
             const u8 *spa, const u8 *pmk_r1,
             size_t pmk_r1_len,
             const u8 *pmk_r1_name, int pairwise,
             const struct vlan_description *vlan,
             int expires_in, int session_timeout,
             const u8 *identity, size_t identity_len,
             const u8 *radius_cui, size_t radius_cui_len)
{
  struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
  int max_expires_in = wpa_auth->conf.r1_max_key_lifetime;
  struct wpa_ft_pmk_r1_sa *r1;
  struct os_reltime now;

  /* TODO: limit on number of entries in cache */
  os_get_reltime(&now);

  if (max_expires_in && (max_expires_in < expires_in || expires_in == 0))
    expires_in = max_expires_in;

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

  os_memcpy(r1->pmk_r1, pmk_r1, pmk_r1_len);
  r1->pmk_r1_len = pmk_r1_len;
  os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
  os_memcpy(r1->spa, spa, ETH_ALEN);
  r1->pairwise = pairwise;
  if (vlan && vlan->notempty) {
    r1->vlan = os_zalloc(sizeof(*vlan));
    if (!r1->vlan) {
      bin_clear_free(r1, sizeof(*r1));
      return -1;
    }
    *r1->vlan = *vlan;
  }
  if (identity) {
    r1->identity = os_malloc(identity_len);
    if (r1->identity) {
      os_memcpy(r1->identity, identity, identity_len);
      r1->identity_len = identity_len;
    }
  }
  if (radius_cui) {
    r1->radius_cui = os_malloc(radius_cui_len);
    if (r1->radius_cui) {
      os_memcpy(r1->radius_cui, radius_cui, radius_cui_len);
      r1->radius_cui_len = radius_cui_len;
    }
  }
  if (session_timeout > 0)
    r1->session_timeout = now.sec + session_timeout;

  dl_list_add(&cache->pmk_r1, &r1->list);

  if (expires_in > 0)
    eloop_register_timeout(expires_in + 1, 0, wpa_ft_expire_pmk_r1,
               r1, NULL);
  if (session_timeout > 0)
    eloop_register_timeout(session_timeout + 1, 0,
               wpa_ft_expire_pmk_r1, r1, NULL);

  return 0;
}


int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
      const u8 *spa, const u8 *pmk_r1_name,
      u8 *pmk_r1, size_t *pmk_r1_len, int *pairwise,
      struct vlan_description *vlan,
      const u8 **identity, size_t *identity_len,
      const u8 **radius_cui, size_t *radius_cui_len,
      int *session_timeout)
{
  struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
  struct wpa_ft_pmk_r1_sa *r1;
  struct os_reltime now;

  os_get_reltime(&now);

  dl_list_for_each(r1, &cache->pmk_r1, struct wpa_ft_pmk_r1_sa, list) {
    if (ether_addr_equal(r1->spa, spa) &&
        os_memcmp_const(r1->pmk_r1_name, pmk_r1_name,
            WPA_PMK_NAME_LEN) == 0) {
      os_memcpy(pmk_r1, r1->pmk_r1, r1->pmk_r1_len);
      *pmk_r1_len = r1->pmk_r1_len;
      if (pairwise)
        *pairwise = r1->pairwise;
      if (vlan && r1->vlan)
        *vlan = *r1->vlan;
      if (vlan && !r1->vlan)
        os_memset(vlan, 0, sizeof(*vlan));
      if (identity && identity_len) {
        *identity = r1->identity;
        *identity_len = r1->identity_len;
      }
      if (radius_cui && radius_cui_len) {
        *radius_cui = r1->radius_cui;
        *radius_cui_len = r1->radius_cui_len;
      }
      if (session_timeout && r1->session_timeout > now.sec)
        *session_timeout = r1->session_timeout -
          now.sec;
      else if (session_timeout && r1->session_timeout)
        *session_timeout = 1;
      else if (session_timeout)
        *session_timeout = 0;
      return 0;
    }
  }

  return -1;
}


static int wpa_ft_rrb_init_r0kh_seq(struct ft_remote_r0kh *r0kh)
{
  if (r0kh->seq)
    return 0;

  r0kh->seq = os_zalloc(sizeof(*r0kh->seq));
  if (!r0kh->seq) {
    wpa_printf(MSG_DEBUG, "FT: Failed to allocate r0kh->seq");
    return -1;
  }

  dl_list_init(&r0kh->seq->rx.queue);

  return 0;
}


static void wpa_ft_rrb_lookup_r0kh(struct wpa_authenticator *wpa_auth,
           const u8 *f_r0kh_id, size_t f_r0kh_id_len,
           struct ft_remote_r0kh **r0kh_out,
           struct ft_remote_r0kh **r0kh_wildcard)
{
  struct ft_remote_r0kh *r0kh;

  *r0kh_wildcard = NULL;
  *r0kh_out = NULL;

  if (wpa_auth->conf.r0kh_list)
    r0kh = *wpa_auth->conf.r0kh_list;
  else
    r0kh = NULL;
  for (; r0kh; r0kh = r0kh->next) {
    if (r0kh->id_len == 1 && r0kh->id[0] == '*')
      *r0kh_wildcard = r0kh;
    if (f_r0kh_id && r0kh->id_len == f_r0kh_id_len &&
        os_memcmp_const(f_r0kh_id, r0kh->id, f_r0kh_id_len) == 0)
      *r0kh_out = r0kh;
  }

  if (!*r0kh_out && !*r0kh_wildcard)
    wpa_printf(MSG_DEBUG, "FT: No matching R0KH found");

  if (*r0kh_out && wpa_ft_rrb_init_r0kh_seq(*r0kh_out) < 0)
    *r0kh_out = NULL;
}


static int wpa_ft_rrb_init_r1kh_seq(struct ft_remote_r1kh *r1kh)
{
  if (r1kh->seq)
    return 0;

  r1kh->seq = os_zalloc(sizeof(*r1kh->seq));
  if (!r1kh->seq) {
    wpa_printf(MSG_DEBUG, "FT: Failed to allocate r1kh->seq");
    return -1;
  }

  dl_list_init(&r1kh->seq->rx.queue);

  return 0;
}


static void wpa_ft_rrb_lookup_r1kh(struct wpa_authenticator *wpa_auth,
           const u8 *f_r1kh_id,
           struct ft_remote_r1kh **r1kh_out,
           struct ft_remote_r1kh **r1kh_wildcard)
{
  struct ft_remote_r1kh *r1kh;

  *r1kh_wildcard = NULL;
  *r1kh_out = NULL;

  if (wpa_auth->conf.r1kh_list)
    r1kh = *wpa_auth->conf.r1kh_list;
  else
    r1kh = NULL;
  for (; r1kh; r1kh = r1kh->next) {
    if (is_zero_ether_addr(r1kh->addr) &&
        is_zero_ether_addr(r1kh->id))
      *r1kh_wildcard = r1kh;
    if (f_r1kh_id &&
        os_memcmp_const(r1kh->id, f_r1kh_id, FT_R1KH_ID_LEN) == 0)
      *r1kh_out = r1kh;
  }

  if (!*r1kh_out && !*r1kh_wildcard)
    wpa_printf(MSG_DEBUG, "FT: No matching R1KH found");

  if (*r1kh_out && wpa_ft_rrb_init_r1kh_seq(*r1kh_out) < 0)
    *r1kh_out = NULL;
}


static int wpa_ft_rrb_check_r0kh(struct wpa_authenticator *wpa_auth,
         const u8 *f_r0kh_id, size_t f_r0kh_id_len)
{
  if (f_r0kh_id_len != wpa_auth->conf.r0_key_holder_len ||
      os_memcmp_const(f_r0kh_id, wpa_auth->conf.r0_key_holder,
          f_r0kh_id_len) != 0)
    return -1;

  return 0;
}


static int wpa_ft_rrb_check_r1kh(struct wpa_authenticator *wpa_auth,
         const u8 *f_r1kh_id)
{
  if (os_memcmp_const(f_r1kh_id, wpa_auth->conf.r1_key_holder,
          FT_R1KH_ID_LEN) != 0)
    return -1;

  return 0;
}


static void wpa_ft_rrb_del_r0kh(void *eloop_ctx, void *timeout_ctx)
{
  struct wpa_authenticator *wpa_auth = eloop_ctx;
  struct ft_remote_r0kh *r0kh, *prev = NULL;

  if (!wpa_auth->conf.r0kh_list)
    return;

  for (r0kh = *wpa_auth->conf.r0kh_list; r0kh; r0kh = r0kh->next) {
    if (r0kh == timeout_ctx)
      break;
    prev = r0kh;
  }
  if (!r0kh)
    return;
  if (prev)
    prev->next = r0kh->next;
  else
    *wpa_auth->conf.r0kh_list = r0kh->next;
  if (r0kh->seq)
    wpa_ft_rrb_seq_flush(wpa_auth, r0kh->seq, 0);
  os_free(r0kh->seq);
  os_free(r0kh);
}


static void wpa_ft_rrb_r0kh_replenish(struct wpa_authenticator *wpa_auth,
              struct ft_remote_r0kh *r0kh, int timeout)
{
  if (timeout > 0)
    eloop_replenish_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
          wpa_auth, r0kh);
}


static void wpa_ft_rrb_r0kh_timeout(struct wpa_authenticator *wpa_auth,
            struct ft_remote_r0kh *r0kh, int timeout)
{
  eloop_cancel_timeout(wpa_ft_rrb_del_r0kh, wpa_auth, r0kh);

  if (timeout > 0)
    eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
               wpa_auth, r0kh);
}


static struct ft_remote_r0kh *
wpa_ft_rrb_add_r0kh(struct wpa_authenticator *wpa_auth,
        struct ft_remote_r0kh *r0kh_wildcard,
        const u8 *src_addr, const u8 *r0kh_id, size_t id_len,
        int timeout)
{
  struct ft_remote_r0kh *r0kh;

  if (!wpa_auth->conf.r0kh_list)
    return NULL;

  r0kh = os_zalloc(sizeof(*r0kh));
  if (!r0kh)
    return NULL;

  if (src_addr)
    os_memcpy(r0kh->addr, src_addr, sizeof(r0kh->addr));

  if (id_len > FT_R0KH_ID_MAX_LEN)
    id_len = FT_R0KH_ID_MAX_LEN;
  os_memcpy(r0kh->id, r0kh_id, id_len);
  r0kh->id_len = id_len;

  os_memcpy(r0kh->key, r0kh_wildcard->key, sizeof(r0kh->key));

  r0kh->next = *wpa_auth->conf.r0kh_list;
  *wpa_auth->conf.r0kh_list = r0kh;

  if (timeout > 0)
    eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
               wpa_auth, r0kh);

  if (wpa_ft_rrb_init_r0kh_seq(r0kh) < 0)
    return NULL;

  return r0kh;
}


static void wpa_ft_rrb_del_r1kh(void *eloop_ctx, void *timeout_ctx)
{
  struct wpa_authenticator *wpa_auth = eloop_ctx;
  struct ft_remote_r1kh *r1kh, *prev = NULL;

  if (!wpa_auth->conf.r1kh_list)
    return;

  for (r1kh = *wpa_auth->conf.r1kh_list; r1kh; r1kh = r1kh->next) {
    if (r1kh == timeout_ctx)
      break;
    prev = r1kh;
  }
  if (!r1kh)
    return;
  if (prev)
    prev->next = r1kh->next;
  else
    *wpa_auth->conf.r1kh_list = r1kh->next;
  if (r1kh->seq)
    wpa_ft_rrb_seq_flush(wpa_auth, r1kh->seq, 0);
  os_free(r1kh->seq);
  os_free(r1kh);
}


static void wpa_ft_rrb_r1kh_replenish(struct wpa_authenticator *wpa_auth,
              struct ft_remote_r1kh *r1kh, int timeout)
{
  if (timeout > 0)
    eloop_replenish_timeout(timeout, 0, wpa_ft_rrb_del_r1kh,
          wpa_auth, r1kh);
}


static struct ft_remote_r1kh *
wpa_ft_rrb_add_r1kh(struct wpa_authenticator *wpa_auth,
        struct ft_remote_r1kh *r1kh_wildcard,
        const u8 *src_addr, const u8 *r1kh_id, int timeout)
{
  struct ft_remote_r1kh *r1kh;

  if (!wpa_auth->conf.r1kh_list)
    return NULL;

  r1kh = os_zalloc(sizeof(*r1kh));
  if (!r1kh)
    return NULL;

  os_memcpy(r1kh->addr, src_addr, sizeof(r1kh->addr));
  os_memcpy(r1kh->id, r1kh_id, sizeof(r1kh->id));
  os_memcpy(r1kh->key, r1kh_wildcard->key, sizeof(r1kh->key));
  r1kh->next = *wpa_auth->conf.r1kh_list;
  *wpa_auth->conf.r1kh_list = r1kh;

  if (timeout > 0)
    eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r1kh,
               wpa_auth, r1kh);

  if (wpa_ft_rrb_init_r1kh_seq(r1kh) < 0)
    return NULL;

  return r1kh;
}


void wpa_ft_sta_deinit(struct wpa_state_machine *sm)
{
  eloop_cancel_timeout(wpa_ft_expire_pull, sm, NULL);
}


static void wpa_ft_deinit_seq(struct wpa_authenticator *wpa_auth)
{
  struct ft_remote_r0kh *r0kh;
  struct ft_remote_r1kh *r1kh;

  eloop_cancel_timeout(wpa_ft_rrb_seq_timeout, wpa_auth, ELOOP_ALL_CTX);

  if (wpa_auth->conf.r0kh_list)
    r0kh = *wpa_auth->conf.r0kh_list;
  else
    r0kh = NULL;
  for (; r0kh; r0kh = r0kh->next) {
    if (!r0kh->seq)
      continue;
    wpa_ft_rrb_seq_flush(wpa_auth, r0kh->seq, 0);
    os_free(r0kh->seq);
    r0kh->seq = NULL;
  }

  if (wpa_auth->conf.r1kh_list)
    r1kh = *wpa_auth->conf.r1kh_list;
  else
    r1kh = NULL;
  for (; r1kh; r1kh = r1kh->next) {
    if (!r1kh->seq)
      continue;
    wpa_ft_rrb_seq_flush(wpa_auth, r1kh->seq, 0);
    os_free(r1kh->seq);
    r1kh->seq = NULL;
  }
}


static void wpa_ft_deinit_rkh_tmp(struct wpa_authenticator *wpa_auth)
{
  struct ft_remote_r0kh *r0kh, *r0kh_next, *r0kh_prev = NULL;
  struct ft_remote_r1kh *r1kh, *r1kh_next, *r1kh_prev = NULL;

  if (wpa_auth->conf.r0kh_list)
    r0kh = *wpa_auth->conf.r0kh_list;
  else
    r0kh = NULL;
  while (r0kh) {
    r0kh_next = r0kh->next;
    if (eloop_cancel_timeout(wpa_ft_rrb_del_r0kh, wpa_auth,
           r0kh) > 0) {
      if (r0kh_prev)
        r0kh_prev->next = r0kh_next;
      else
        *wpa_auth->conf.r0kh_list = r0kh_next;
      os_free(r0kh);
    } else {
      r0kh_prev = r0kh;
    }
    r0kh = r0kh_next;
  }

  if (wpa_auth->conf.r1kh_list)
    r1kh = *wpa_auth->conf.r1kh_list;
  else
    r1kh = NULL;
  while (r1kh) {
    r1kh_next = r1kh->next;
    if (eloop_cancel_timeout(wpa_ft_rrb_del_r1kh, wpa_auth,
           r1kh) > 0) {
      if (r1kh_prev)
        r1kh_prev->next = r1kh_next;
      else
        *wpa_auth->conf.r1kh_list = r1kh_next;
      os_free(r1kh);
    } else {
      r1kh_prev = r1kh;
    }
    r1kh = r1kh_next;
  }
}


void wpa_ft_deinit(struct wpa_authenticator *wpa_auth)
{
  wpa_ft_deinit_seq(wpa_auth);
  wpa_ft_deinit_rkh_tmp(wpa_auth);
}


static void wpa_ft_block_r0kh(struct wpa_authenticator *wpa_auth,
            const u8 *f_r0kh_id, size_t f_r0kh_id_len)
{
  struct ft_remote_r0kh *r0kh, *r0kh_wildcard;

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

  wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len,
             &r0kh, &r0kh_wildcard);

  if (!r0kh_wildcard) {
    /* r0kh removed after neg_timeout and might need re-adding */
    return;
  }

  wpa_hexdump(MSG_DEBUG, "FT: Temporarily block R0KH-ID",
        f_r0kh_id, f_r0kh_id_len);

  if (r0kh) {
    wpa_ft_rrb_r0kh_timeout(wpa_auth, r0kh,
          wpa_auth->conf.rkh_neg_timeout);
    os_memset(r0kh->addr, 0, ETH_ALEN);
  } else
    wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard, NULL, f_r0kh_id,
            f_r0kh_id_len,
            wpa_auth->conf.rkh_neg_timeout);
}


static void wpa_ft_expire_pull(void *eloop_ctx, void *timeout_ctx)
{
  struct wpa_state_machine *sm = eloop_ctx;

  wpa_printf(MSG_DEBUG, "FT: Timeout pending pull request for " MACSTR,
       MAC2STR(sm->addr));
  if (sm->ft_pending_pull_left_retries <= 0)
    wpa_ft_block_r0kh(sm->wpa_auth, sm->r0kh_id, sm->r0kh_id_len);

  /* cancel multiple timeouts */
  eloop_cancel_timeout(wpa_ft_expire_pull, sm, NULL);
  ft_finish_pull(sm);
}


static int wpa_ft_pull_pmk_r1(struct wpa_state_machine *sm,
            const u8 *ies, size_t ies_len,
            const u8 *pmk_r0_name)
{
  struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
  u8 *packet = NULL;
  const u8 *key, *f_r1kh_id = sm->wpa_auth->conf.r1_key_holder;
  size_t packet_len, key_len;
  struct ft_rrb_seq f_seq;
  int tsecs, tusecs, first;
  struct wpabuf *ft_pending_req_ies;
  int r0kh_timeout;
  struct tlv_list req_enc[] = {
    { .type = FT_RRB_PMK_R0_NAME, .len = WPA_PMK_NAME_LEN,
      .data = pmk_r0_name },
    { .type = FT_RRB_S1KH_ID, .len = ETH_ALEN,
      .data = sm->addr },
    { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
  };
  struct tlv_list req_auth[] = {
    { .type = FT_RRB_NONCE, .len = FT_RRB_NONCE_LEN,
      .data = sm->ft_pending_pull_nonce },
    { .type = FT_RRB_SEQ, .len = sizeof(f_seq),
      .data = (u8 *) &f_seq },
    { .type = FT_RRB_R0KH_ID, .len = sm->r0kh_id_len,
      .data = sm->r0kh_id },
    { .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
      .data = f_r1kh_id },
    { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
  };

  if (sm->ft_pending_pull_left_retries <= 0)
    return -1;
  first = sm->ft_pending_pull_left_retries ==
    sm->wpa_auth->conf.rkh_pull_retries;
  sm->ft_pending_pull_left_retries--;

  wpa_ft_rrb_lookup_r0kh(sm->wpa_auth, sm->r0kh_id, sm->r0kh_id_len,
             &r0kh, &r0kh_wildcard);

  /* Keep r0kh sufficiently long in the list for seq num check */
  r0kh_timeout = sm->wpa_auth->conf.rkh_pull_timeout / 1000 +
    1 + ftRRBseqTimeout;
  if (r0kh) {
    wpa_ft_rrb_r0kh_replenish(sm->wpa_auth, r0kh, r0kh_timeout);
  } else if (r0kh_wildcard) {
    wpa_printf(MSG_DEBUG, "FT: Using wildcard R0KH-ID");
    /* r0kh->addr: updated by SEQ_RESP and wpa_ft_expire_pull */
    r0kh = wpa_ft_rrb_add_r0kh(sm->wpa_auth, r0kh_wildcard,
             r0kh_wildcard->addr,
             sm->r0kh_id, sm->r0kh_id_len,
             r0kh_timeout);
  }
  if (r0kh == NULL) {
    wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
          sm->r0kh_id, sm->r0kh_id_len);
    return -1;
  }
  if (is_zero_ether_addr(r0kh->addr)) {
    wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID is temporarily blocked",
          sm->r0kh_id, sm->r0kh_id_len);
    return -1;
  }
  if (ether_addr_equal(r0kh->addr, sm->wpa_auth->addr)) {
    wpa_printf(MSG_DEBUG,
         "FT: R0KH-ID points to self - no matching key available");
    return -1;
  }

  key = r0kh->key;
  key_len = sizeof(r0kh->key);

  if (r0kh->seq->rx.num_last == 0) {
    /* A sequence request will be sent out anyway when pull
     * response is received. Send it out now to avoid one RTT. */
    wpa_ft_rrb_seq_req(sm->wpa_auth, r0kh->seq, r0kh->addr,
           r0kh->id, r0kh->id_len, f_r1kh_id, key,
           key_len, NULL, 0, NULL, 0, NULL);
  }

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

  if (first &&
      random_get_bytes(sm->ft_pending_pull_nonce, FT_RRB_NONCE_LEN) < 0) {
    wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
         "nonce");
    return -1;
  }

  if (wpa_ft_new_seq(r0kh->seq, &f_seq) < 0) {
    wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
    return -1;
  }

  if (wpa_ft_rrb_build(key, key_len, req_enc, NULL, req_auth, NULL,
           sm->wpa_auth->addr, FT_PACKET_R0KH_R1KH_PULL,
           &packet, &packet_len) < 0)
    return -1;

  ft_pending_req_ies = wpabuf_alloc_copy(ies, ies_len);
  wpabuf_free(sm->ft_pending_req_ies);
  sm->ft_pending_req_ies = ft_pending_req_ies;
  if (!sm->ft_pending_req_ies) {
    os_free(packet);
    return -1;
  }

  tsecs = sm->wpa_auth->conf.rkh_pull_timeout / 1000;
  tusecs = (sm->wpa_auth->conf.rkh_pull_timeout % 1000) * 1000;
  eloop_register_timeout(tsecs, tusecs, wpa_ft_expire_pull, sm, NULL);

  wpa_ft_rrb_oui_send(sm->wpa_auth, r0kh->addr, FT_PACKET_R0KH_R1KH_PULL,
          packet, packet_len);

  os_free(packet);

  return 0;
}


int wpa_ft_store_pmk_fils(struct wpa_state_machine *sm,
        const u8 *pmk_r0, const u8 *pmk_r0_name)
{
  int expires_in = sm->wpa_auth->conf.r0_key_lifetime;
  struct vlan_description vlan;
  const u8 *identity, *radius_cui;
  size_t identity_len, radius_cui_len;
  int session_timeout;
  size_t pmk_r0_len = wpa_key_mgmt_sha384(sm->wpa_key_mgmt) ?
    SHA384_MAC_LEN : PMK_LEN;

  if (wpa_ft_get_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) {
    wpa_printf(MSG_DEBUG, "FT: vlan not available for STA " MACSTR,
         MAC2STR(sm->addr));
    return -1;
  }

  identity_len = wpa_ft_get_identity(sm->wpa_auth, sm->addr, &identity);
  radius_cui_len = wpa_ft_get_radius_cui(sm->wpa_auth, sm->addr,
                 &radius_cui);
  session_timeout = wpa_ft_get_session_timeout(sm->wpa_auth, sm->addr);

  return wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_len,
           pmk_r0_name, sm->pairwise, &vlan, expires_in,
           session_timeout, identity, identity_len,
           radius_cui, radius_cui_len);
}


int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, struct wpa_ptk *ptk,
         u8 *pmk_r0, u8 *pmk_r1, u8 *pmk_r0_name,
         size_t *key_len, size_t kdk_len)
{
  size_t pmk_r0_len, pmk_r1_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;
  const u8 *mpmk;
  size_t mpmk_len;

  if (sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
      (sm->xxkey_len == SHA256_MAC_LEN ||
       sm->xxkey_len == SHA384_MAC_LEN ||
       sm->xxkey_len == SHA512_MAC_LEN))
    pmk_r0_len = sm->xxkey_len;
  else if (wpa_key_mgmt_sha384(sm->wpa_key_mgmt))
    pmk_r0_len = SHA384_MAC_LEN;
  else
    pmk_r0_len = PMK_LEN;
  *key_len = pmk_r1_len = pmk_r0_len;

  if (sm->xxkey_len > 0) {
    mpmk = sm->xxkey;
    mpmk_len = sm->xxkey_len;
  } else if (sm->pmksa) {
    mpmk = sm->pmksa->pmk;
    mpmk_len = sm->pmksa->pmk_len;
  } else {
    wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
         "derivation");
    return -1;
  }

  if (wpa_derive_pmk_r0(mpmk, mpmk_len, ssid, ssid_len, mdid,
            r0kh, r0kh_len, sm->addr,
            pmk_r0, pmk_r0_name,
            sm->wpa_key_mgmt) < 0 ||
      wpa_derive_pmk_r1(pmk_r0, pmk_r0_len, pmk_r0_name, r1kh, sm->addr,
            pmk_r1, sm->pmk_r1_name) < 0)
    return -1;

  return wpa_pmk_r1_to_ptk(pmk_r1, pmk_r1_len, sm->SNonce, sm->ANonce,
         sm->addr, sm->wpa_auth->addr, sm->pmk_r1_name,
         ptk, ptk_name, sm->wpa_key_mgmt, sm->pairwise,
         kdk_len);
}


void wpa_auth_ft_store_keys(struct wpa_state_machine *sm, const u8 *pmk_r0,
          const u8 *pmk_r1, const u8 *pmk_r0_name,
          size_t key_len)
{
  int psk_local = sm->wpa_auth->conf.ft_psk_generate_local;
  int expires_in = sm->wpa_auth->conf.r0_key_lifetime;
  struct vlan_description vlan;
  const u8 *identity, *radius_cui;
  size_t identity_len, radius_cui_len;
  int session_timeout;

  if (psk_local && wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
    return;

  if (wpa_ft_get_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) {
    wpa_printf(MSG_DEBUG, "FT: vlan not available for STA " MACSTR,
         MAC2STR(sm->addr));
    return;
  }

  identity_len = wpa_ft_get_identity(sm->wpa_auth, sm->addr, &identity);
  radius_cui_len = wpa_ft_get_radius_cui(sm->wpa_auth, sm->addr,
                 &radius_cui);
  session_timeout = wpa_ft_get_session_timeout(sm->wpa_auth, sm->addr);


  wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, key_len,
          pmk_r0_name,
          sm->pairwise, &vlan, expires_in,
          session_timeout, identity, identity_len,
          radius_cui, radius_cui_len);
  wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, key_len,
          sm->pmk_r1_name, sm->pairwise, &vlan,
          expires_in, session_timeout, identity,
          identity_len, radius_cui, radius_cui_len);
}


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,
             bool reassoc, int vlan_id)
{
  u8 *subelem;
  struct wpa_auth_config *conf = &sm->wpa_auth->conf;
  struct wpa_group *gsm = sm->group;
  size_t subelem_len, pad_len;
  const u8 *key;
  size_t key_len;
  u8 keybuf[WPA_GTK_MAX_LEN];
  const u8 *kek;
  size_t kek_len;

#ifdef CONFIG_IEEE80211BE
  if (reassoc && vlan_id)
    gsm = wpa_select_vlan_wpa_group(gsm, vlan_id);
#endif /* CONFIG_IEEE80211BE */

  if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
    kek = sm->PTK.kek2;
    kek_len = sm->PTK.kek2_len;
  } else {
    kek = sm->PTK.kek;
    kek_len = sm->PTK.kek_len;
  }

  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 && key_len < sizeof(keybuf)) {
    os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
    if (conf->disable_gtk) {
      /*
       * Provide unique random GTK to each STA to prevent use
       * of GTK in the BSS.
       */
      if (random_get_bytes(keybuf, key_len) < 0)
        return NULL;
    }
    os_memset(keybuf + key_len, 0, pad_len);
    keybuf[key_len] = 0xdd;
    key_len += pad_len;
    key = keybuf;
  } else if (conf->disable_gtk) {
    /*
     * Provide unique random GTK to each STA to prevent use of GTK
     * in the BSS.
     */
    if (random_get_bytes(keybuf, key_len) < 0)
      return NULL;
    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(kek, kek_len, key_len / 8, key, subelem + 13)) {
    wpa_printf(MSG_DEBUG,
         "FT: GTK subelem encryption failed: kek_len=%d",
         (int) kek_len);
    forced_memzero(keybuf, sizeof(keybuf));
    os_free(subelem);
    return NULL;
  }

  forced_memzero(keybuf, sizeof(keybuf));
  *len = subelem_len;
  return subelem;
}


static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
{
  u8 *subelem, *pos;
  struct wpa_auth_config *conf = &sm->wpa_auth->conf;
  struct wpa_group *gsm = sm->group;
  size_t subelem_len;
  const u8 *kek, *igtk;
  size_t kek_len;
  size_t igtk_len;
  u8 stub_igtk[WPA_IGTK_MAX_LEN];

  if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
    kek = sm->PTK.kek2;
    kek_len = sm->PTK.kek2_len;
  } else {
    kek = sm->PTK.kek;
    kek_len = sm->PTK.kek_len;
  }

  igtk_len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);

  /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
   * Key[16+8] */
  subelem_len = 1 + 1 + 2 + 6 + 1 + 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++ = igtk_len;
  igtk = gsm->IGTK[gsm->GN_igtk - 4];
  if (conf->disable_gtk) {
    /*
     * Provide unique random IGTK to each STA to prevent use of
     * IGTK in the BSS.
     */
    if (random_get_bytes(stub_igtk, igtk_len / 8) < 0) {
      os_free(subelem);
      return NULL;
    }
    igtk = stub_igtk;
  }
  if (aes_wrap(kek, kek_len, igtk_len / 8, igtk, pos)) {
    wpa_printf(MSG_DEBUG,
         "FT: IGTK subelem encryption failed: kek_len=%d",
         (int) kek_len);
    os_free(subelem);
    return NULL;
  }

  *len = subelem_len;
  return subelem;
}


static u8 * wpa_ft_bigtk_subelem(struct wpa_state_machine *sm, size_t *len)
{
  u8 *subelem, *pos;
  struct wpa_authenticator *wpa_auth = sm->wpa_auth;
  struct wpa_group *gsm = wpa_auth->group;
  size_t subelem_len;
  const u8 *kek, *bigtk;
  size_t kek_len;
  size_t bigtk_len;

  if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
    kek = sm->PTK.kek2;
    kek_len = sm->PTK.kek2_len;
  } else {
    kek = sm->PTK.kek;
    kek_len = sm->PTK.kek_len;
  }

  bigtk_len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);

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

  pos = subelem;
  *pos++ = FTIE_SUBELEM_BIGTK;
  *pos++ = subelem_len - 2;
  WPA_PUT_LE16(pos, gsm->GN_bigtk);
  pos += 2;
  wpa_auth_get_seqnum(wpa_auth, NULL, gsm->GN_bigtk, pos);
  pos += 6;
  *pos++ = bigtk_len;
  bigtk = gsm->BIGTK[gsm->GN_bigtk - 6];
  if (aes_wrap(kek, kek_len, bigtk_len / 8, bigtk, pos)) {
    wpa_printf(MSG_DEBUG,
         "FT: BIGTK subelem encryption failed: kek_len=%d",
         (int) kek_len);
    os_free(subelem);
    return NULL;
  }

  *len = subelem_len;
  return subelem;
}


static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm,
        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;
  }

  if (parse.wmm_tspec) {
    struct wmm_tspec_element *tspec;

    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));
  }

#ifdef NEED_AP_MLME
  if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) {
    int res;

    res = wmm_process_tspec((struct wmm_tspec_element *) pos);
    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(struct wmm_tspec_element);
    }
    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(struct wpa_state_machine *sm, 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(sm, 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,
         int omit_rsnxe, bool reassoc, int vlan_id)
{
  u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
  u8 *fte_mic, *elem_count;
  size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
  u8 rsnxe_buf[10], *rsnxe = rsnxe_buf;
  size_t rsnxe_len;
  int rsnxe_used;
  int res;
  struct wpa_auth_config *conf;
  struct wpa_ft_ies parse;
  u8 *ric_start;
  u8 *anonce, *snonce;
  const u8 *kck;
  size_t kck_len;
  size_t key_len;

  if (sm == NULL)
    return pos;

  conf = &sm->wpa_auth->conf;

  if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt))
    return pos;

  end = pos + max_len;

#ifdef CONFIG_TESTING_OPTIONS
  if (auth_alg == WLAN_AUTH_FT &&
      sm->wpa_auth->conf.rsne_override_ft_set) {
    wpa_printf(MSG_DEBUG,
         "TESTING: RSNE FT override for MIC calculation");
    rsnie = sm->wpa_auth->conf.rsne_override_ft;
    rsnie_len = sm->wpa_auth->conf.rsne_override_ft_len;
    if (end - pos < (long int) rsnie_len)
      return pos;
    os_memcpy(pos, rsnie, rsnie_len);
    rsnie = pos;
    pos += rsnie_len;
    if (rsnie_len > PMKID_LEN && sm->pmk_r1_name_valid) {
      int idx;

      /* Replace all 0xff PMKID with the valid PMKR1Name */
      for (idx = 0; idx < PMKID_LEN; idx++) {
        if (rsnie[rsnie_len - 1 - idx] != 0xff)
          break;
      }
      if (idx == PMKID_LEN)
        os_memcpy(&rsnie[rsnie_len - PMKID_LEN],
            sm->pmk_r1_name, WPA_PMK_NAME_LEN);
    }
  } else
#endif /* CONFIG_TESTING_OPTIONS */
  if (auth_alg == WLAN_AUTH_FT ||
      ((auth_alg == WLAN_AUTH_FILS_SK ||
        auth_alg == WLAN_AUTH_FILS_SK_PFS ||
        auth_alg == WLAN_AUTH_FILS_PK) &&
       (sm->wpa_key_mgmt & (WPA_KEY_MGMT_FT_FILS_SHA256 |
          WPA_KEY_MGMT_FT_FILS_SHA384)))) {
    if (!sm->pmk_r1_name_valid) {
      wpa_printf(MSG_ERROR,
           "FT: PMKR1Name is not valid for Assoc Resp RSNE");
      return NULL;
    }
    wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name for Assoc Resp RSNE",
          sm->pmk_r1_name, WPA_PMK_NAME_LEN);
    /*
     * RSN (only present if this is a Reassociation Response and
     * part of a fast BSS transition; or if this is a
     * (Re)Association Response frame during an FT initial mobility
     * domain association using FILS)
     */
    res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
    if (res < 0)
      return NULL;
    rsnie = pos;
    rsnie_len = res;
    pos += res;
  }

  /* Mobility Domain Information */
  res = wpa_write_mdie(conf, pos, end - pos);
  if (res < 0)
    return NULL;
  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, reassoc,
               vlan_id);
    if (!subelem) {
      wpa_printf(MSG_DEBUG,
           "FT: Failed to add GTK subelement");
      return NULL;
    }
    r0kh_id = sm->r0kh_id;
    r0kh_id_len = sm->r0kh_id_len;
    anonce = sm->ANonce;
    snonce = sm->SNonce;
    if (sm->mgmt_frame_prot) {
      u8 *igtk;
      size_t igtk_len;
      u8 *nbuf;
      igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
      if (igtk == NULL) {
        wpa_printf(MSG_DEBUG,
             "FT: Failed to add IGTK subelement");
        os_free(subelem);
        return NULL;
      }
      nbuf = os_realloc(subelem, subelem_len + igtk_len);
      if (nbuf == NULL) {
        os_free(subelem);
        os_free(igtk);
        return NULL;
      }
      subelem = nbuf;
      os_memcpy(subelem + subelem_len, igtk, igtk_len);
      subelem_len += igtk_len;
      os_free(igtk);
    }
    if (sm->mgmt_frame_prot && conf->beacon_prot) {
      u8 *bigtk;
      size_t bigtk_len;
      u8 *nbuf;

      bigtk = wpa_ft_bigtk_subelem(sm, &bigtk_len);
      if (!bigtk) {
        wpa_printf(MSG_DEBUG,
             "FT: Failed to add BIGTK subelement");
        os_free(subelem);
        return NULL;
      }
      nbuf = os_realloc(subelem, subelem_len + bigtk_len);
      if (!nbuf) {
        os_free(subelem);
        os_free(bigtk);
        return NULL;
      }
      subelem = nbuf;
      os_memcpy(subelem + subelem_len, bigtk, bigtk_len);
      subelem_len += bigtk_len;
      os_free(bigtk);
    }
#ifdef CONFIG_OCV
    if (wpa_auth_uses_ocv(sm)) {
      struct wpa_channel_info ci;
      u8 *nbuf, *ocipos;

      if (wpa_channel_info(sm->wpa_auth, &ci) != 0) {
        wpa_printf(MSG_WARNING,
             "Failed to get channel info for OCI element");
        os_free(subelem);
        return NULL;
      }
#ifdef CONFIG_TESTING_OPTIONS
      if (conf->oci_freq_override_ft_assoc) {
        wpa_printf(MSG_INFO,
             "TEST: Override OCI frequency %d -> %u MHz",
             ci.frequency,
             conf->oci_freq_override_ft_assoc);
        ci.frequency = conf->oci_freq_override_ft_assoc;
      }
#endif /* CONFIG_TESTING_OPTIONS */

      subelem_len += 2 + OCV_OCI_LEN;
      nbuf = os_realloc(subelem, subelem_len);
      if (!nbuf) {
        os_free(subelem);
        return NULL;
      }
      subelem = nbuf;

      ocipos = subelem + subelem_len - 2 - OCV_OCI_LEN;
      *ocipos++ = FTIE_SUBELEM_OCI;
      *ocipos++ = OCV_OCI_LEN;
      if (ocv_insert_oci(&ci, &ocipos) < 0) {
        os_free(subelem);
        return NULL;
      }
    }
#endif /* CONFIG_OCV */
  } else {
    r0kh_id = conf->r0_key_holder;
    r0kh_id_len = conf->r0_key_holder_len;
    anonce = NULL;
    snonce = NULL;
  }
  rsnxe_used = (auth_alg == WLAN_AUTH_FT) &&
    (conf->sae_pwe == SAE_PWE_HASH_TO_ELEMENT ||
     conf->sae_pwe == SAE_PWE_BOTH);
#ifdef CONFIG_TESTING_OPTIONS
  if (sm->wpa_auth->conf.ft_rsnxe_used) {
    rsnxe_used = sm->wpa_auth->conf.ft_rsnxe_used == 1;
    wpa_printf(MSG_DEBUG, "TESTING: FT: Force RSNXE Used %d",
         rsnxe_used);
  }
#endif /* CONFIG_TESTING_OPTIONS */
  key_len = sm->xxkey_len;
  if (!key_len)
    key_len = sm->pmk_r1_len;
  if (!key_len && sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
      sm->wpa_auth->cb->get_psk) {
    size_t psk_len;

    if (sm->wpa_auth->cb->get_psk(sm->wpa_auth->cb_ctx,
                sm->addr, sm->p2p_dev_addr,
                NULL, &psk_len, NULL))
      key_len = psk_len;
  }
  res = wpa_write_ftie(conf, sm->wpa_key_mgmt, key_len,
           r0kh_id, r0kh_id_len,
           anonce, snonce, pos, end - pos,
           subelem, subelem_len, rsnxe_used);
  os_free(subelem);
  if (res < 0)
    return NULL;
  ftie = pos;
  ftie_len = res;
  pos += res;

  if (sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
      key_len == SHA512_MAC_LEN) {
    struct rsn_ftie_sha512 *_ftie =
      (struct rsn_ftie_sha512 *) (ftie + 2);

    fte_mic = _ftie->mic;
    elem_count = &_ftie->mic_control[1];
  } else if ((sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
        key_len == SHA384_MAC_LEN) ||
       wpa_key_mgmt_sha384(sm->wpa_key_mgmt)) {
    struct rsn_ftie_sha384 *_ftie =
      (struct rsn_ftie_sha384 *) (ftie + 2);

    fte_mic = _ftie->mic;
    elem_count = &_ftie->mic_control[1];
  } else {
    struct rsn_ftie *_ftie = (struct rsn_ftie *) (ftie + 2);

    fte_mic = _ftie->mic;
    elem_count = &_ftie->mic_control[1];
  }
  if (auth_alg == WLAN_AUTH_FT)
    *elem_count = 3; /* Information element count */

  ric_start = pos;
  if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse,
           sm->wpa_key_mgmt, false) == 0 && parse.ric) {
    pos = wpa_ft_process_ric(sm, pos, end, parse.ric,
           parse.ric_len);
    if (auth_alg == WLAN_AUTH_FT)
      *elem_count +=
        ieee802_11_ie_count(ric_start,
                pos - ric_start);
  }
  if (ric_start == pos)
    ric_start = NULL;

  if (omit_rsnxe) {
    rsnxe_len = 0;
  } else {
    res = wpa_write_rsnxe(&sm->wpa_auth->conf, rsnxe,
              sizeof(rsnxe_buf));
    if (res < 0) {
      pos = NULL;
      goto fail;
    }
    rsnxe_len = res;
  }
#ifdef CONFIG_TESTING_OPTIONS
  if (auth_alg == WLAN_AUTH_FT &&
      sm->wpa_auth->conf.rsnxe_override_ft_set) {
    wpa_printf(MSG_DEBUG,
         "TESTING: RSNXE FT override for MIC calculation");
    rsnxe = sm->wpa_auth->conf.rsnxe_override_ft;
    rsnxe_len = sm->wpa_auth->conf.rsnxe_override_ft_len;
  }
#endif /* CONFIG_TESTING_OPTIONS */
  if (auth_alg == WLAN_AUTH_FT && rsnxe_len)
    *elem_count += 1;

  if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
    kck = sm->PTK.kck2;
    kck_len = sm->PTK.kck2_len;
  } else {
    kck = sm->PTK.kck;
    kck_len = sm->PTK.kck_len;
  }
  if (auth_alg == WLAN_AUTH_FT &&
      wpa_ft_mic(sm->wpa_key_mgmt, kck, kck_len,
           sm->addr, sm->wpa_auth->addr, 6,
           mdie, mdie_len, ftie, ftie_len,
           rsnie, rsnie_len,
           ric_start, ric_start ? pos - ric_start : 0,
           rsnxe_len ? rsnxe : NULL, rsnxe_len,
           NULL,
           fte_mic) < 0) {
    wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
    pos = NULL;
    goto fail;
  }

  os_free(sm->assoc_resp_ftie);
  sm->assoc_resp_ftie = os_malloc(ftie_len);
  if (!sm->assoc_resp_ftie) {
    pos = NULL;
    goto fail;
  }
  os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len);

fail:
  wpa_ft_parse_ies_free(&parse);
  return pos;
}


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,
           enum key_flag key_flag)
{
  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, key_flag);
}


#ifdef CONFIG_PASN
static inline int wpa_auth_set_ltf_keyseed(struct wpa_authenticator *wpa_auth,
             const u8 *peer_addr,
             const u8 *ltf_keyseed,
             size_t ltf_keyseed_len)
{
  if (!wpa_auth->cb->set_ltf_keyseed)
    return -1;
  return wpa_auth->cb->set_ltf_keyseed(wpa_auth->cb_ctx, peer_addr,
               ltf_keyseed, ltf_keyseed_len);
}
#endif /* CONFIG_PASN */


static inline int wpa_auth_add_sta_ft(struct wpa_authenticator *wpa_auth,
              const u8 *addr)
{
  if (!wpa_auth->cb->add_sta_ft)
    return -1;
  return wpa_auth->cb->add_sta_ft(wpa_auth->cb_ctx, addr);
}


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

  /* MLME-SETKEYS.request(PTK) */
  alg = wpa_cipher_to_alg(sm->pairwise);
  klen = wpa_cipher_key_len(sm->pairwise);
  if (!wpa_cipher_valid_pairwise(sm->pairwise)) {
    wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip "
         "PTK configuration", sm->pairwise);
    return;
  }

  if (sm->tk_already_set) {
    /* Must avoid TK reconfiguration to prevent clearing of TX/RX
     * PN in the driver */
    wpa_printf(MSG_DEBUG,
         "FT: Do not re-install same PTK to the driver");
    return;
  }

  if (!retry)
    wpa_auth_add_sta_ft(sm->wpa_auth, sm->addr);

  /* 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, sm->keyidx_active,
           sm->PTK.tk, klen, KEY_FLAG_PAIRWISE_RX_TX))
    return;

#ifdef CONFIG_PASN
  if (sm->wpa_auth->conf.secure_ltf &&
      ieee802_11_rsnx_capab(sm->rsnxe, WLAN_RSNX_CAPAB_SECURE_LTF) &&
      wpa_auth_set_ltf_keyseed(sm->wpa_auth, sm->addr,
             sm->PTK.ltf_keyseed,
             sm->PTK.ltf_keyseed_len)) {
    wpa_printf(MSG_ERROR,
         "FT: Failed to set LTF keyseed to driver");
    return;
  }
#endif /* CONFIG_PASN */

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

  wpa_auth_store_ptksa(sm->wpa_auth, sm->addr, sm->pairwise,
           dot11RSNAConfigPMKLifetime, &sm->PTK);
}


/* Derive PMK-R1 from PSK, check all available PSK */
static int wpa_ft_psk_pmk_r1(struct wpa_state_machine *sm,
           const u8 *req_pmk_r1_name,
           u8 *out_pmk_r1, int *out_pairwise,
           struct vlan_description *out_vlan,
           const u8 **out_identity, size_t *out_identity_len,
           const u8 **out_radius_cui,
           size_t *out_radius_cui_len,
           int *out_session_timeout)
{
  const u8 *pmk = NULL;
  u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
  u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
  struct wpa_authenticator *wpa_auth = sm->wpa_auth;
  const u8 *mdid = wpa_auth->conf.mobility_domain;
  const u8 *r0kh = sm->r0kh_id;
  size_t r0kh_len = sm->r0kh_id_len;
  const u8 *r1kh = wpa_auth->conf.r1_key_holder;
  const u8 *ssid = wpa_auth->conf.ssid;
  size_t ssid_len = wpa_auth->conf.ssid_len;
  int pairwise;

  pairwise = sm->pairwise;

  for (;;) {
    pmk = wpa_ft_get_psk(wpa_auth, sm->addr, sm->p2p_dev_addr,
             pmk);
    if (pmk == NULL)
      break;

    if (wpa_derive_pmk_r0(pmk, PMK_LEN, ssid, ssid_len, mdid, r0kh,
              r0kh_len, sm->addr,
              pmk_r0, pmk_r0_name,
              WPA_KEY_MGMT_FT_PSK) < 0 ||
        wpa_derive_pmk_r1(pmk_r0, PMK_LEN, pmk_r0_name, r1kh,
              sm->addr, pmk_r1, pmk_r1_name) < 0 ||
        os_memcmp_const(pmk_r1_name, req_pmk_r1_name,
            WPA_PMK_NAME_LEN) != 0)
      continue;

    /* We found a PSK that matches the requested pmk_r1_name */
    wpa_printf(MSG_DEBUG,
         "FT: Found PSK to generate PMK-R1 locally");
    os_memcpy(out_pmk_r1, pmk_r1, PMK_LEN);
    if (out_pairwise)
      *out_pairwise = pairwise;
    os_memcpy(sm->PMK, pmk, PMK_LEN);
    sm->pmk_len = PMK_LEN;
    if (out_vlan &&
        wpa_ft_get_vlan(sm->wpa_auth, sm->addr, out_vlan) < 0) {
      wpa_printf(MSG_DEBUG, "FT: vlan not available for STA "
           MACSTR, MAC2STR(sm->addr));
      return -1;
    }

    if (out_identity && out_identity_len) {
      *out_identity_len = wpa_ft_get_identity(
        sm->wpa_auth, sm->addr, out_identity);
    }

    if (out_radius_cui && out_radius_cui_len) {
      *out_radius_cui_len = wpa_ft_get_radius_cui(
        sm->wpa_auth, sm->addr, out_radius_cui);
    }

    if (out_session_timeout) {
      *out_session_timeout = wpa_ft_get_session_timeout(
        sm->wpa_auth, sm->addr);
    }

    return 0;
  }

  wpa_printf(MSG_DEBUG,
       "FT: Did not find PSK to generate PMK-R1 locally");
  return -1;
}


/* Detect the configuration the station asked for.
 * Required to detect FT-PSK and pairwise cipher.
 */
static int wpa_ft_set_key_mgmt(struct wpa_state_machine *sm,
             struct wpa_ft_ies *parse)
{
  int key_mgmt, ciphers;

  if (sm->wpa_key_mgmt)
    return 0;

  key_mgmt = parse->key_mgmt & sm->wpa_auth->conf.wpa_key_mgmt;
  if (!key_mgmt) {
    wpa_printf(MSG_DEBUG, "FT: Invalid key mgmt (0x%x) from "
         MACSTR, parse->key_mgmt, MAC2STR(sm->addr));
    return -1;
  }
  if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X)
    sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X;
#ifdef CONFIG_SHA384
  else if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X_SHA384)
    sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X_SHA384;
#endif /* CONFIG_SHA384 */
  else if (key_mgmt & WPA_KEY_MGMT_FT_PSK)
    sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_PSK;
#ifdef CONFIG_FILS
  else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA256)
    sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_FILS_SHA256;
  else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA384)
    sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_FILS_SHA384;
#endif /* CONFIG_FILS */
  ciphers = parse->pairwise_cipher & sm->wpa_auth->conf.rsn_pairwise;
  if (!ciphers) {
    wpa_printf(MSG_DEBUG, "FT: Invalid pairwise cipher (0x%x) from "
         MACSTR,
         parse->pairwise_cipher, MAC2STR(sm->addr));
    return -1;
  }
  sm->pairwise = wpa_pick_pairwise_cipher(ciphers, 0);

  return 0;
}


static int wpa_ft_local_derive_pmk_r1(struct wpa_authenticator *wpa_auth,
              struct wpa_state_machine *sm,
              const u8 *r0kh_id, size_t r0kh_id_len,
              const u8 *req_pmk_r0_name,
              u8 *out_pmk_r1_name,
              u8 *out_pmk_r1, int *out_pairwise,
              struct vlan_description *vlan,
              const u8 **identity, size_t *identity_len,
              const u8 **radius_cui,
              size_t *radius_cui_len,
              int *out_session_timeout,
              size_t *pmk_r1_len)
{
  struct wpa_auth_config *conf = &wpa_auth->conf;
  const struct wpa_ft_pmk_r0_sa *r0;
  int expires_in = 0;
  int session_timeout = 0;
  struct os_reltime now;

  if (conf->r0_key_holder_len != r0kh_id_len ||
      os_memcmp(conf->r0_key_holder, r0kh_id, conf->r0_key_holder_len) !=
      0)
    return -1; /* not our R0KH-ID */

  wpa_printf(MSG_DEBUG, "FT: STA R0KH-ID matching local configuration");
  if (wpa_ft_fetch_pmk_r0(sm->wpa_auth, sm->addr, req_pmk_r0_name, &r0) <
      0)
    return -1; /* no matching PMKR0Name in local cache */

  wpa_printf(MSG_DEBUG, "FT: Requested PMKR0Name found in local cache");

  if (wpa_derive_pmk_r1(r0->pmk_r0, r0->pmk_r0_len, r0->pmk_r0_name,
            conf->r1_key_holder,
            sm->addr, out_pmk_r1, out_pmk_r1_name) < 0)
    return -1;

  os_get_reltime(&now);
  if (r0->expiration)
    expires_in = r0->expiration - now.sec;

  if (r0->session_timeout)
    session_timeout = r0->session_timeout - now.sec;

  wpa_ft_store_pmk_r1(wpa_auth, sm->addr, out_pmk_r1, r0->pmk_r0_len,
          out_pmk_r1_name,
          sm->pairwise, r0->vlan, expires_in, session_timeout,
          r0->identity, r0->identity_len,
          r0->radius_cui, r0->radius_cui_len);

  *out_pairwise = sm->pairwise;
  if (vlan) {
    if (r0->vlan)
      *vlan = *r0->vlan;
    else
      os_memset(vlan, 0, sizeof(*vlan));
  }

  if (identity && identity_len) {
    *identity = r0->identity;
    *identity_len = r0->identity_len;
  }

  if (radius_cui && radius_cui_len) {
    *radius_cui = r0->radius_cui;
    *radius_cui_len = r0->radius_cui_len;
  }

  *out_session_timeout = session_timeout;

  *pmk_r1_len = r0->pmk_r0_len;

  return 0;
}


static int 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;
  u8 pmk_r1[PMK_LEN_MAX], 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;
  int ret;
  u8 *pos, *end;
  int pairwise, session_timeout = 0;
  struct vlan_description vlan;
  const u8 *identity, *radius_cui;
  size_t identity_len = 0, radius_cui_len = 0;
  size_t pmk_r1_len, kdk_len, len;
  int retval = WLAN_STATUS_UNSPECIFIED_FAILURE;

  *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, false)) {
    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");
    retval = WLAN_STATUS_INVALID_MDE;
    goto out;
  }

  if (!parse.ftie || parse.ftie_len < sizeof(struct rsn_ftie)) {
    wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
    retval = WLAN_STATUS_INVALID_FTE;
    goto out;
  }

  if (parse.r0kh_id == NULL) {
    wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
    retval = WLAN_STATUS_INVALID_FTE;
    goto out;
  }

  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");
    retval = WLAN_STATUS_INVALID_PMKID;
    goto out;
  }

  if (wpa_ft_set_key_mgmt(sm, &parse) < 0)
    goto out;

  wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
        parse.rsn_pmkid, WPA_PMK_NAME_LEN);

  if (conf->ft_psk_generate_local &&
      wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) {
    if (wpa_derive_pmk_r1_name(parse.rsn_pmkid,
             sm->wpa_auth->conf.r1_key_holder,
             sm->addr, pmk_r1_name, PMK_LEN) < 0)
      goto out;
    if (wpa_ft_psk_pmk_r1(sm, pmk_r1_name, pmk_r1, &pairwise,
              &vlan, &identity, &identity_len,
              &radius_cui, &radius_cui_len,
              &session_timeout) < 0) {
      retval = WLAN_STATUS_INVALID_PMKID;
      goto out;
    }
    pmk_r1_len = PMK_LEN;
    wpa_printf(MSG_DEBUG,
         "FT: Generated PMK-R1 for FT-PSK locally");
    goto pmk_r1_derived;
  }

  /* Need to test all possible hash algorithms for FT-SAE-EXT-KEY since
   * the key length is not yet known. For other AKMs, only the length
   * identified by the AKM is used. */
  for (len = SHA256_MAC_LEN; len <= SHA512_MAC_LEN; len += 16) {
    if (parse.key_mgmt != WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
        ((wpa_key_mgmt_sha384(parse.key_mgmt) &&
          len != SHA384_MAC_LEN) ||
         (!wpa_key_mgmt_sha384(parse.key_mgmt) &&
          len != SHA256_MAC_LEN)))
      continue;
    if (wpa_derive_pmk_r1_name(parse.rsn_pmkid,
             sm->wpa_auth->conf.r1_key_holder,
             sm->addr, pmk_r1_name, len) < 0)
      continue;

    if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name,
          pmk_r1, &pmk_r1_len, &pairwise, &vlan,
          &identity, &identity_len, &radius_cui,
          &radius_cui_len,
          &session_timeout) == 0) {
      wpa_printf(MSG_DEBUG,
           "FT: Found PMKR1Name (using SHA%zu) from local cache",
           pmk_r1_len * 8);
      goto pmk_r1_derived;
    }
  }

  wpa_printf(MSG_DEBUG,
       "FT: No PMK-R1 available in local cache for the requested PMKR1Name");
  if (wpa_ft_local_derive_pmk_r1(sm->wpa_auth, sm,
               parse.r0kh_id, parse.r0kh_id_len,
               parse.rsn_pmkid,
               pmk_r1_name, pmk_r1, &pairwise,
               &vlan, &identity, &identity_len,
               &radius_cui, &radius_cui_len,
               &session_timeout, &pmk_r1_len) == 0) {
    wpa_printf(MSG_DEBUG,
         "FT: Generated PMK-R1 based on local PMK-R0");
    goto pmk_r1_derived;
  }

  if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) {
    wpa_printf(MSG_DEBUG,
         "FT: Did not have matching PMK-R1 and either unknown or blocked R0KH-ID or NAK from R0KH");
    retval = WLAN_STATUS_INVALID_PMKID;
    goto out;
  }

  retval = -1; /* Status pending */
  goto out;

pmk_r1_derived:
  wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, pmk_r1_len);
  sm->pmk_r1_name_valid = 1;
  os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
  os_memcpy(sm->pmk_r1, pmk_r1, pmk_r1_len);
  sm->pmk_r1_len = pmk_r1_len;

  /*
   * Make sure the pairwise suite indicate by the STA matches the one that
   * was used during initial mobility domain association.
   */
  if (!(parse.pairwise_cipher & pairwise)) {
    wpa_printf(MSG_ERROR,
         "FT: Pairwise cipher from PMK-R1 cache (0x%x) not used in the RSNE (0x%x) - reject",
         pairwise, parse.pairwise_cipher);
    retval = WLAN_STATUS_INVALID_PAIRWISE_CIPHER;
    goto out;
  }

  if (sm->pmk_r1_len == SHA512_MAC_LEN)
    sm->hash_alg = RSN_HASH_SHA512;
  else if (sm->pmk_r1_len == SHA384_MAC_LEN)
    sm->hash_alg = RSN_HASH_SHA384;
  else
    sm->hash_alg = RSN_HASH_SHA256;

  if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
    wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
         "ANonce");
    goto out;
  }

  /* Now that we know the correct PMK-R1 length and as such, the length
   * of the MIC field, fetch the SNonce. */
  if (pmk_r1_len == SHA512_MAC_LEN) {
    const struct rsn_ftie_sha512 *ftie;

    ftie = (const struct rsn_ftie_sha512 *) parse.ftie;
    if (!ftie || parse.ftie_len < sizeof(*ftie)) {
      wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
      retval = WLAN_STATUS_INVALID_FTE;
      goto out;
    }

    os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
  } else if (pmk_r1_len == SHA384_MAC_LEN) {
    const struct rsn_ftie_sha384 *ftie;

    ftie = (const struct rsn_ftie_sha384 *) parse.ftie;
    if (!ftie || parse.ftie_len < sizeof(*ftie)) {
      wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
      retval = WLAN_STATUS_INVALID_FTE;
      goto out;
    }

    os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
  } else {
    const struct rsn_ftie *ftie;

    ftie = (const struct rsn_ftie *) parse.ftie;
    if (!ftie || parse.ftie_len < sizeof(*ftie)) {
      wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
      retval = WLAN_STATUS_INVALID_FTE;
      goto out;
    }

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

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

  if (sm->wpa_auth->conf.force_kdk_derivation ||
      (sm->wpa_auth->conf.secure_ltf &&
       ieee802_11_rsnx_capab(sm->rsnxe, WLAN_RSNX_CAPAB_SECURE_LTF)))
    kdk_len = WPA_KDK_MAX_LEN;
  else
    kdk_len = 0;

  if (wpa_pmk_r1_to_ptk(pmk_r1, pmk_r1_len, sm->SNonce, sm->ANonce,
            sm->addr, sm->wpa_auth->addr, pmk_r1_name,
            &sm->PTK, ptk_name, parse.key_mgmt,
            pairwise, kdk_len) < 0)
    goto out;

#ifdef CONFIG_PASN
  if (sm->wpa_auth->conf.secure_ltf &&
      ieee802_11_rsnx_capab(sm->rsnxe, WLAN_RSNX_CAPAB_SECURE_LTF) &&
      wpa_ltf_keyseed(&sm->PTK, parse.key_mgmt, pairwise)) {
    wpa_printf(MSG_DEBUG, "FT: Failed to derive LTF keyseed");
    goto out;
  }
#endif /* CONFIG_PASN */

  sm->pairwise = pairwise;
  sm->PTK_valid = true;
  sm->tk_already_set = false;
  wpa_ft_install_ptk(sm, 0);

  if (wpa_ft_set_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) {
    wpa_printf(MSG_DEBUG, "FT: Failed to configure VLAN");
    goto out;
  }
  if (wpa_ft_set_identity(sm->wpa_auth, sm->addr,
        identity, identity_len) < 0 ||
      wpa_ft_set_radius_cui(sm->wpa_auth, sm->addr,
          radius_cui, radius_cui_len) < 0) {
    wpa_printf(MSG_DEBUG, "FT: Failed to configure identity/CUI");
    goto out;
  }
  wpa_ft_set_session_timeout(sm->wpa_auth, sm->addr, session_timeout);

  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)
    goto fail;

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

  ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
  if (ret < 0)
    goto fail;
  pos += ret;

  ret = wpa_write_mdie(conf, pos, end - pos);
  if (ret < 0)
    goto fail;
  pos += ret;

  ret = wpa_write_ftie(conf, parse.key_mgmt, pmk_r1_len,
           parse.r0kh_id, parse.r0kh_id_len,
           sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0,
           0);
  if (ret < 0)
    goto fail;
  pos += ret;

  *resp_ies_len = pos - *resp_ies;

  retval = WLAN_STATUS_SUCCESS;
  goto out;
fail:
  os_free(*resp_ies);
  *resp_ies = NULL;
out:
  wpa_ft_parse_ies_free(&parse);
  return retval;
}


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

  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(sm->wpa_auth->addr),
       auth_transaction);
  sm->ft_pending_cb = cb;
  sm->ft_pending_cb_ctx = ctx;
  sm->ft_pending_auth_transaction = auth_transaction;
  sm->ft_pending_pull_left_retries = sm->wpa_auth->conf.rkh_pull_retries;
  res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
              &resp_ies_len);
  if (res < 0) {
    wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available");
    return;
  }
  status = res;

  wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
       " auth_transaction=%d status=%u (%s)",
       MAC2STR(sm->addr), auth_transaction + 1, status,
       status2str(status));
  wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
  cb(ctx, sm->addr, auth_transaction + 1, status, resp_ies, resp_ies_len);
  os_free(resp_ies);
}


int 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;
  u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
  size_t mic_len;
  unsigned int count;
  const u8 *kck;
  size_t kck_len;
  struct wpa_auth_config *conf;
  int retval = WLAN_STATUS_UNSPECIFIED_FAILURE;

  if (sm == NULL)
    return WLAN_STATUS_UNSPECIFIED_FAILURE;

  conf = &sm->wpa_auth->conf;

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

  if (wpa_ft_parse_ies(ies, ies_len, &parse, sm->wpa_key_mgmt,
           false) < 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");
    goto out;
  }

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

  if (os_memcmp_const(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");
    retval = WLAN_STATUS_INVALID_PMKID;
    goto out;
  }

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

  if (sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
      sm->pmk_r1_len == SHA512_MAC_LEN)
    mic_len = 32;
  else if ((sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
      sm->pmk_r1_len == SHA384_MAC_LEN) ||
     wpa_key_mgmt_sha384(sm->wpa_key_mgmt))
    mic_len = 24;
  else
    mic_len = 16;

  if (!parse.ftie || !parse.fte_anonce || !parse.fte_snonce ||
      parse.fte_mic_len != mic_len) {
    wpa_printf(MSG_DEBUG,
         "FT: Invalid FTE (fte_mic_len=%zu mic_len=%zu)",
         parse.fte_mic_len, mic_len);
    retval = WLAN_STATUS_INVALID_FTE;
    goto out;
  }

  if (os_memcmp(parse.fte_snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
    wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
    wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
          parse.fte_snonce, WPA_NONCE_LEN);
    wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
          sm->SNonce, WPA_NONCE_LEN);
    retval = WLAN_STATUS_INVALID_FTE;
    goto out;
  }

  if (os_memcmp(parse.fte_anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
    wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
    wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
          parse.fte_anonce, WPA_NONCE_LEN);
    wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
          sm->ANonce, WPA_NONCE_LEN);
    retval = WLAN_STATUS_INVALID_FTE;
    goto out;
  }

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

  if (parse.r0kh_id_len != sm->r0kh_id_len ||
      os_memcmp_const(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);
    retval = WLAN_STATUS_INVALID_FTE;
    goto out;
  }

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

  if (os_memcmp_const(parse.r1kh_id, 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",
          conf->r1_key_holder, FT_R1KH_ID_LEN);
    retval = WLAN_STATUS_INVALID_FTE;
    goto out;
  }

  if (parse.rsn_pmkid == NULL ||
      os_memcmp_const(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);
    retval = WLAN_STATUS_INVALID_PMKID;
    goto out;
  }

  count = 3;
  if (parse.ric)
    count += ieee802_11_ie_count(parse.ric, parse.ric_len);
  if (parse.rsnxe)
    count++;
  if (parse.fte_elem_count != count) {
    wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
         "Control: received %u expected %u",
         parse.fte_elem_count, count);
    goto out;
  }

  if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
    kck = sm->PTK.kck2;
    kck_len = sm->PTK.kck2_len;
  } else {
    kck = sm->PTK.kck;
    kck_len = sm->PTK.kck_len;
  }
  if (wpa_ft_mic(sm->wpa_key_mgmt, kck, kck_len,
           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,
           parse.rsnxe ? parse.rsnxe - 2 : NULL,
           parse.rsnxe ? parse.rsnxe_len + 2 : 0,
           NULL,
           mic) < 0) {
    wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
    goto out;
  }

  if (os_memcmp_const(mic, parse.fte_mic, mic_len) != 0) {
    wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
    wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR,
         MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr));
    wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC",
          parse.fte_mic, mic_len);
    wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len);
    wpa_hexdump(MSG_MSGDUMP, "FT: MDIE",
          parse.mdie - 2, parse.mdie_len + 2);
    wpa_hexdump(MSG_MSGDUMP, "FT: FTIE",
          parse.ftie - 2, parse.ftie_len + 2);
    wpa_hexdump(MSG_MSGDUMP, "FT: RSN",
          parse.rsn - 2, parse.rsn_len + 2);
    wpa_hexdump(MSG_MSGDUMP, "FT: RSNXE",
          parse.rsnxe ? parse.rsnxe - 2 : NULL,
          parse.rsnxe ? parse.rsnxe_len + 2 : 0);
    retval = WLAN_STATUS_INVALID_FTE;
    goto out;
  }

  if (parse.fte_rsnxe_used &&
      (conf->sae_pwe == SAE_PWE_HASH_TO_ELEMENT ||
       conf->sae_pwe == SAE_PWE_BOTH) &&
      !parse.rsnxe) {
    wpa_printf(MSG_INFO,
         "FT: FTE indicated that STA uses RSNXE, but RSNXE was not included");
    retval = -1; /* discard request */
    goto out;
  }

#ifdef CONFIG_OCV
  if (wpa_auth_uses_ocv(sm)) {
    struct wpa_channel_info ci;
    int tx_chanwidth;
    int tx_seg1_idx;
    enum oci_verify_result res;

    if (wpa_channel_info(sm->wpa_auth, &ci) != 0) {
      wpa_printf(MSG_WARNING,
           "Failed to get channel info to validate received OCI in (Re)Assoc Request");
      goto out;
    }

    if (get_sta_tx_parameters(sm,
            channel_width_to_int(ci.chanwidth),
            ci.seg1_idx, &tx_chanwidth,
            &tx_seg1_idx) < 0)
      goto out;

    res = ocv_verify_tx_params(parse.oci, parse.oci_len, &ci,
             tx_chanwidth, tx_seg1_idx);
    if (wpa_auth_uses_ocv(sm) == 2 && res == OCI_NOT_FOUND) {
      /* Work around misbehaving STAs */
      wpa_printf(MSG_INFO,
           "Disable OCV with a STA that does not send OCI");
      wpa_auth_set_ocv(sm, 0);
    } else if (res != OCI_SUCCESS) {
      wpa_printf(MSG_WARNING, "OCV failed: %s", ocv_errorstr);
      if (sm->wpa_auth->conf.msg_ctx)
        wpa_msg(sm->wpa_auth->conf.msg_ctx, MSG_INFO,
          OCV_FAILURE "addr=" MACSTR
          " frame=ft-reassoc-req error=%s",
          MAC2STR(sm->addr), ocv_errorstr);
      retval = WLAN_STATUS_INVALID_FTE;
      goto out;
    }
  }
#endif /* CONFIG_OCV */

  retval = WLAN_STATUS_SUCCESS;
out:
  wpa_ft_parse_ies_free(&parse);
  return retval;
}


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 (!ether_addr_equal(sta_addr, sm->addr)) {
    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 validity 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) ||
      ether_addr_equal(target_ap, sm->wpa_auth->addr)) {
    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);

  if (!sm->wpa_auth->conf.ft_over_ds) {
    wpa_printf(MSG_DEBUG, "FT: Over-DS option disabled - reject");
    return -1;
  }

  /* RRB - Forward action frame to the target AP */
  frame = os_malloc(sizeof(*frame) + len);
  if (frame == NULL)
    return -1;
  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 void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst,
             u16 auth_transaction, u16 resp,
             const u8 *ies, size_t ies_len)
{
  struct wpa_state_machine *sm = ctx;
  wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR,
       MAC2STR(sm->addr));
  wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr,
          resp, ies, ies_len);
}


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;
  size_t resp_ies_len;
  int res;

  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);

  sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb;
  sm->ft_pending_cb_ctx = sm;
  os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN);
  sm->ft_pending_pull_left_retries = sm->wpa_auth->conf.rkh_pull_retries;
  res = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
              &resp_ies_len);
  if (res < 0) {
    wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response");
    return 0;
  }
  status = res;

  res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status,
          resp_ies, resp_ies_len);
  os_free(resp_ies);
  return res;
}


static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
             const u8 *current_ap, const u8 *sta_addr,
             u16 status, const u8 *resp_ies,
             size_t resp_ies_len)
{
  struct wpa_authenticator *wpa_auth = sm->wpa_auth;
  size_t rlen;
  struct ft_rrb_frame *frame;
  u8 *pos;

  wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
       " CurrentAP=" MACSTR " status=%u (%s)",
       MAC2STR(sm->addr), MAC2STR(current_ap), status,
       status2str(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);
  if (frame == NULL)
    return -1;
  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);

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

  return 0;
}


static int wpa_ft_rrb_build_r0(const u8 *key, const size_t key_len,
             const struct tlv_list *tlvs,
             const struct wpa_ft_pmk_r0_sa *pmk_r0,
             const u8 *r1kh_id, const u8 *s1kh_id,
             const struct tlv_list *tlv_auth,
             const u8 *src_addr, u8 type,
             u8 **packet, size_t *packet_len)
{
  u8 pmk_r1[PMK_LEN_MAX];
  size_t pmk_r1_len = pmk_r0->pmk_r0_len;
  u8 pmk_r1_name[WPA_PMK_NAME_LEN];
  u8 f_pairwise[sizeof(le16)];
  u8 f_expires_in[sizeof(le16)];
  u8 f_session_timeout[sizeof(le32)];
  int expires_in;
  int session_timeout;
  struct os_reltime now;
  int ret;
  struct tlv_list sess_tlv[] = {
    { .type = FT_RRB_PMK_R1, .len = pmk_r1_len,
      .data = pmk_r1 },
    { .type = FT_RRB_PMK_R1_NAME, .len = sizeof(pmk_r1_name),
      .data = pmk_r1_name },
    { .type = FT_RRB_PAIRWISE, .len = sizeof(f_pairwise),
      .data = f_pairwise },
    { .type = FT_RRB_EXPIRES_IN, .len = sizeof(f_expires_in),
      .data = f_expires_in },
    { .type = FT_RRB_IDENTITY, .len = pmk_r0->identity_len,
      .data = pmk_r0->identity },
    { .type = FT_RRB_RADIUS_CUI, .len = pmk_r0->radius_cui_len,
      .data = pmk_r0->radius_cui },
    { .type = FT_RRB_SESSION_TIMEOUT,
      .len = sizeof(f_session_timeout),
      .data = f_session_timeout },
    { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
  };

  wpa_printf(MSG_DEBUG, "FT: Derive PMK-R1 for peer AP");
  if (wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_len,
            pmk_r0->pmk_r0_name, r1kh_id,
            s1kh_id, pmk_r1, pmk_r1_name) < 0)
    return -1;
  WPA_PUT_LE16(f_pairwise, pmk_r0->pairwise);

  os_get_reltime(&now);
  if (pmk_r0->expiration > now.sec)
    expires_in = pmk_r0->expiration - now.sec;
  else if (pmk_r0->expiration)
    expires_in = 1;
  else
    expires_in = 0;
  WPA_PUT_LE16(f_expires_in, expires_in);

  if (pmk_r0->session_timeout > now.sec)
    session_timeout = pmk_r0->session_timeout - now.sec;
  else if (pmk_r0->session_timeout)
    session_timeout = 1;
  else
    session_timeout = 0;
  WPA_PUT_LE32(f_session_timeout, session_timeout);

  ret = wpa_ft_rrb_build(key, key_len, tlvs, sess_tlv, tlv_auth,
             pmk_r0->vlan, src_addr, type,
             packet, packet_len);

  forced_memzero(pmk_r1, sizeof(pmk_r1));

  return ret;
}


static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
            const u8 *src_addr,
            const u8 *enc, size_t enc_len,
            const u8 *auth, size_t auth_len,
            int no_defer)
{
  const char *msgtype = "pull request";
  u8 *plain = NULL, *packet = NULL;
  size_t plain_len = 0, packet_len = 0;
  struct ft_remote_r1kh *r1kh, *r1kh_wildcard;
  const u8 *key;
  size_t key_len;
  int seq_ret;
  const u8 *f_nonce, *f_r0kh_id, *f_r1kh_id, *f_s1kh_id, *f_pmk_r0_name;
  size_t f_nonce_len, f_r0kh_id_len, f_r1kh_id_len, f_s1kh_id_len;
  size_t f_pmk_r0_name_len;
  const struct wpa_ft_pmk_r0_sa *r0;
  int ret;
  struct tlv_list resp[2];
  struct tlv_list resp_auth[5];
  struct ft_rrb_seq f_seq;

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

  RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, msgtype, -1);
  wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", f_r0kh_id, f_r0kh_id_len);

  if (wpa_ft_rrb_check_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len)) {
    wpa_printf(MSG_DEBUG, "FT: R0KH-ID mismatch");
    goto out;
  }

  RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, msgtype, FT_R1KH_ID_LEN);
  wpa_printf(MSG_DEBUG, "FT: R1KH-ID=" MACSTR, MAC2STR(f_r1kh_id));

  wpa_ft_rrb_lookup_r1kh(wpa_auth, f_r1kh_id, &r1kh, &r1kh_wildcard);
  if (r1kh) {
    key = r1kh->key;
    key_len = sizeof(r1kh->key);
  } else if (r1kh_wildcard) {
    wpa_printf(MSG_DEBUG, "FT: Using wildcard R1KH-ID");
    key = r1kh_wildcard->key;
    key_len = sizeof(r1kh_wildcard->key);
  } else {
    goto out;
  }

  RRB_GET_AUTH(FT_RRB_NONCE, nonce, "pull request", FT_RRB_NONCE_LEN);
  wpa_hexdump(MSG_DEBUG, "FT: nonce", f_nonce, f_nonce_len);

  seq_ret = FT_RRB_SEQ_DROP;
  if (r1kh)
    seq_ret = wpa_ft_rrb_seq_chk(r1kh->seq, src_addr, enc, enc_len,
               auth, auth_len, msgtype, no_defer);
  if (!no_defer && r1kh_wildcard &&
      (!r1kh || !ether_addr_equal(r1kh->addr, src_addr))) {
    /* wildcard: r1kh-id unknown or changed addr -> do a seq req */
    seq_ret = FT_RRB_SEQ_DEFER;
  }

  if (seq_ret == FT_RRB_SEQ_DROP)
    goto out;

  if (wpa_ft_rrb_decrypt(key, key_len, enc, enc_len, auth, auth_len,
             src_addr, FT_PACKET_R0KH_R1KH_PULL,
             &plain, &plain_len) < 0)
    goto out;

  if (!r1kh)
    r1kh = wpa_ft_rrb_add_r1kh(wpa_auth, r1kh_wildcard, src_addr,
             f_r1kh_id,
             wpa_auth->conf.rkh_pos_timeout);
  if (!r1kh)
    goto out;

  if (seq_ret == FT_RRB_SEQ_DEFER) {
    wpa_ft_rrb_seq_req(wpa_auth, r1kh->seq, src_addr, f_r0kh_id,
           f_r0kh_id_len, f_r1kh_id, key, key_len,
           enc, enc_len, auth, auth_len,
           &wpa_ft_rrb_rx_pull);
    goto out;
  }

  wpa_ft_rrb_seq_accept(wpa_auth, r1kh->seq, src_addr, auth, auth_len,
            msgtype);
  wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh,
          wpa_auth->conf.rkh_pos_timeout);

  RRB_GET(FT_RRB_PMK_R0_NAME, pmk_r0_name, msgtype, WPA_PMK_NAME_LEN);
  wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", f_pmk_r0_name,
        f_pmk_r0_name_len);

  RRB_GET(FT_RRB_S1KH_ID, s1kh_id, msgtype, ETH_ALEN);
  wpa_printf(MSG_DEBUG, "FT: S1KH-ID=" MACSTR, MAC2STR(f_s1kh_id));

  if (wpa_ft_new_seq(r1kh->seq, &f_seq) < 0) {
    wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
    goto out;
  }

  wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull response from " MACSTR
       " to " MACSTR,
       MAC2STR(wpa_auth->addr), MAC2STR(src_addr));

  resp[0].type = FT_RRB_S1KH_ID;
  resp[0].len = f_s1kh_id_len;
  resp[0].data = f_s1kh_id;
  resp[1].type = FT_RRB_LAST_EMPTY;
  resp[1].len = 0;
  resp[1].data = NULL;

  resp_auth[0].type = FT_RRB_NONCE;
  resp_auth[0].len = f_nonce_len;
  resp_auth[0].data = f_nonce;
  resp_auth[1].type = FT_RRB_SEQ;
  resp_auth[1].len = sizeof(f_seq);
  resp_auth[1].data = (u8 *) &f_seq;
  resp_auth[2].type = FT_RRB_R0KH_ID;
  resp_auth[2].len = f_r0kh_id_len;
  resp_auth[2].data = f_r0kh_id;
  resp_auth[3].type = FT_RRB_R1KH_ID;
  resp_auth[3].len = f_r1kh_id_len;
  resp_auth[3].data = f_r1kh_id;
  resp_auth[4].type = FT_RRB_LAST_EMPTY;
  resp_auth[4].len = 0;
  resp_auth[4].data = NULL;

  if (wpa_ft_fetch_pmk_r0(wpa_auth, f_s1kh_id, f_pmk_r0_name, &r0) < 0) {
    wpa_printf(MSG_DEBUG, "FT: No matching PMK-R0-Name found");
    ret = wpa_ft_rrb_build(key, key_len, resp, NULL, resp_auth,
               NULL, wpa_auth->addr,
               FT_PACKET_R0KH_R1KH_RESP,
               &packet, &packet_len);
  } else {
    ret = wpa_ft_rrb_build_r0(key, key_len, resp, r0, f_r1kh_id,
            f_s1kh_id, resp_auth, wpa_auth->addr,
            FT_PACKET_R0KH_R1KH_RESP,
            &packet, &packet_len);
  }

  if (!ret)
    wpa_ft_rrb_oui_send(wpa_auth, src_addr,
            FT_PACKET_R0KH_R1KH_RESP, packet,
            packet_len);

out:
  os_free(plain);
  os_free(packet);

  return 0;
}


/* @returns  0 on success
 *          -1 on error
 *          -2 if FR_RRB_PAIRWISE is missing
 */
static int wpa_ft_rrb_rx_r1(struct wpa_authenticator *wpa_auth,
          const u8 *src_addr, u8 type,
          const u8 *enc, size_t enc_len,
          const u8 *auth, size_t auth_len,
          const char *msgtype, u8 *s1kh_id_out,
          int (*cb)(struct wpa_authenticator *wpa_auth,
              const u8 *src_addr,
              const u8 *enc, size_t enc_len,
              const u8 *auth, size_t auth_len,
              int no_defer))
{
  u8 *plain = NULL;
  size_t plain_len = 0;
  struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
  const u8 *key;
  size_t key_len;
  int seq_ret;
  const u8 *f_r1kh_id, *f_s1kh_id, *f_r0kh_id;
  const u8 *f_pmk_r1_name, *f_pairwise, *f_pmk_r1;
  const u8 *f_expires_in;
  size_t f_r1kh_id_len, f_s1kh_id_len, f_r0kh_id_len;
  const u8 *f_identity, *f_radius_cui;
  const u8 *f_session_timeout;
  size_t f_pmk_r1_name_len, f_pairwise_len, f_pmk_r1_len;
  size_t f_expires_in_len;
  size_t f_identity_len, f_radius_cui_len;
  size_t f_session_timeout_len;
  int pairwise;
  int ret = -1;
  int expires_in;
  int session_timeout;
  struct vlan_description vlan;
  size_t pmk_r1_len;

  RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, msgtype, -1);
  wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", f_r0kh_id, f_r0kh_id_len);

  RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, msgtype, FT_R1KH_ID_LEN);
  wpa_printf(MSG_DEBUG, "FT: R1KH-ID=" MACSTR, MAC2STR(f_r1kh_id));

  if (wpa_ft_rrb_check_r1kh(wpa_auth, f_r1kh_id)) {
    wpa_printf(MSG_DEBUG, "FT: R1KH-ID mismatch");
    goto out;
  }

  wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len, &r0kh,
             &r0kh_wildcard);
  if (r0kh) {
    key = r0kh->key;
    key_len = sizeof(r0kh->key);
  } else if (r0kh_wildcard) {
    wpa_printf(MSG_DEBUG, "FT: Using wildcard R0KH-ID");
    key = r0kh_wildcard->key;
    key_len = sizeof(r0kh_wildcard->key);
  } else {
    goto out;
  }

  seq_ret = FT_RRB_SEQ_DROP;
  if (r0kh) {
    seq_ret = wpa_ft_rrb_seq_chk(r0kh->seq, src_addr, enc, enc_len,
               auth, auth_len, msgtype,
               cb ? 0 : 1);
  }
  if (cb && r0kh_wildcard &&
      (!r0kh || !ether_addr_equal(r0kh->addr, src_addr))) {
    /* wildcard: r0kh-id unknown or changed addr -> do a seq req */
    seq_ret = FT_RRB_SEQ_DEFER;
  }

  if (seq_ret == FT_RRB_SEQ_DROP)
    goto out;

  if (wpa_ft_rrb_decrypt(key, key_len, enc, enc_len, auth, auth_len,
             src_addr, type, &plain, &plain_len) < 0)
    goto out;

  if (!r0kh)
    r0kh = wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard, src_addr,
             f_r0kh_id, f_r0kh_id_len,
             wpa_auth->conf.rkh_pos_timeout);
  if (!r0kh)
    goto out;

  if (seq_ret == FT_RRB_SEQ_DEFER) {
    wpa_ft_rrb_seq_req(wpa_auth, r0kh->seq, src_addr, f_r0kh_id,
           f_r0kh_id_len, f_r1kh_id, key, key_len,
           enc, enc_len, auth, auth_len, cb);
    goto out;
  }

  wpa_ft_rrb_seq_accept(wpa_auth, r0kh->seq, src_addr, auth, auth_len,
            msgtype);
  wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh,
          wpa_auth->conf.rkh_pos_timeout);

  RRB_GET(FT_RRB_S1KH_ID, s1kh_id, msgtype, ETH_ALEN);
  wpa_printf(MSG_DEBUG, "FT: S1KH-ID=" MACSTR, MAC2STR(f_s1kh_id));

  if (s1kh_id_out)
    os_memcpy(s1kh_id_out, f_s1kh_id, ETH_ALEN);

  ret = -2;
  RRB_GET(FT_RRB_PAIRWISE, pairwise, msgtype, sizeof(le16));
  wpa_hexdump(MSG_DEBUG, "FT: pairwise", f_pairwise, f_pairwise_len);

  ret = -1;
  RRB_GET(FT_RRB_PMK_R1_NAME, pmk_r1_name, msgtype, WPA_PMK_NAME_LEN);
  wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
        f_pmk_r1_name, WPA_PMK_NAME_LEN);

  pmk_r1_len = PMK_LEN;
  if (wpa_ft_rrb_get_tlv(plain, plain_len, FT_RRB_PMK_R1, &f_pmk_r1_len,
             &f_pmk_r1) == 0 &&
      (f_pmk_r1_len == PMK_LEN || f_pmk_r1_len == SHA384_MAC_LEN ||
       f_pmk_r1_len == SHA512_MAC_LEN))
    pmk_r1_len = f_pmk_r1_len;
  RRB_GET(FT_RRB_PMK_R1, pmk_r1, msgtype, pmk_r1_len);
  wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f_pmk_r1, pmk_r1_len);

  pairwise = WPA_GET_LE16(f_pairwise);

  RRB_GET_OPTIONAL(FT_RRB_EXPIRES_IN, expires_in, msgtype,
       sizeof(le16));
  if (f_expires_in)
    expires_in = WPA_GET_LE16(f_expires_in);
  else
    expires_in = 0;

  wpa_printf(MSG_DEBUG, "FT: PMK-R1 %s - expires_in=%d", msgtype,
       expires_in);

  if (wpa_ft_rrb_get_tlv_vlan(plain, plain_len, &vlan) < 0) {
    wpa_printf(MSG_DEBUG, "FT: Cannot parse vlan");
    wpa_ft_rrb_dump(plain, plain_len);
    goto out;
  }

  wpa_printf(MSG_DEBUG, "FT: vlan %d%s",
       le_to_host16(vlan.untagged), vlan.tagged[0] ? "+" : "");

  RRB_GET_OPTIONAL(FT_RRB_IDENTITY, identity, msgtype, -1);
  if (f_identity)
    wpa_hexdump_ascii(MSG_DEBUG, "FT: Identity", f_identity,
          f_identity_len);

  RRB_GET_OPTIONAL(FT_RRB_RADIUS_CUI, radius_cui, msgtype, -1);
  if (f_radius_cui)
    wpa_hexdump_ascii(MSG_DEBUG, "FT: CUI", f_radius_cui,
          f_radius_cui_len);

  RRB_GET_OPTIONAL(FT_RRB_SESSION_TIMEOUT, session_timeout, msgtype,
       sizeof(le32));
  if (f_session_timeout)
    session_timeout = WPA_GET_LE32(f_session_timeout);
  else
    session_timeout = 0;
  wpa_printf(MSG_DEBUG, "FT: session_timeout %d", session_timeout);

  if (wpa_ft_store_pmk_r1(wpa_auth, f_s1kh_id, f_pmk_r1, pmk_r1_len,
        f_pmk_r1_name,
        pairwise, &vlan, expires_in, session_timeout,
        f_identity, f_identity_len, f_radius_cui,
        f_radius_cui_len) < 0)
    goto out;

  ret = 0;
out:
  bin_clear_free(plain, plain_len);

  return ret;

}


static void ft_finish_pull(struct wpa_state_machine *sm)
{
  int res;
  u8 *resp_ies;
  size_t resp_ies_len;
  u16 status;

  if (!sm->ft_pending_cb || !sm->ft_pending_req_ies)
    return;

  res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies),
              wpabuf_len(sm->ft_pending_req_ies),
              &resp_ies, &resp_ies_len);
  if (res < 0) {
    /* this loop is broken by ft_pending_pull_left_retries */
    wpa_printf(MSG_DEBUG,
         "FT: Callback postponed until response is available");
    return;
  }
  wpabuf_free(sm->ft_pending_req_ies);
  sm->ft_pending_req_ies = NULL;
  status = res;
  wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR
       " - status %u", MAC2STR(sm->addr), status);

  sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr,
        sm->ft_pending_auth_transaction + 1, status,
        resp_ies, resp_ies_len);
  os_free(resp_ies);
}


struct ft_get_sta_ctx {
  const u8 *nonce;
  const u8 *s1kh_id;
  struct wpa_state_machine *sm;
};


static int ft_get_sta_cb(struct wpa_state_machine *sm, void *ctx)
{
  struct ft_get_sta_ctx *info = ctx;

  if ((info->s1kh_id &&
       !ether_addr_equal(info->s1kh_id, sm->addr)) ||
      os_memcmp(info->nonce, sm->ft_pending_pull_nonce,
          FT_RRB_NONCE_LEN) != 0 ||
      sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL)
    return 0;

  info->sm = sm;

  return 1;
}


static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
            const u8 *src_addr,
            const u8 *enc, size_t enc_len,
            const u8 *auth, size_t auth_len,
            int no_defer)
{
  const char *msgtype = "pull response";
  int nak, ret = -1;
  struct ft_get_sta_ctx ctx;
  u8 s1kh_id[ETH_ALEN];
  const u8 *f_nonce;
  size_t f_nonce_len;

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

  RRB_GET_AUTH(FT_RRB_NONCE, nonce, msgtype, FT_RRB_NONCE_LEN);
  wpa_hexdump(MSG_DEBUG, "FT: nonce", f_nonce, f_nonce_len);

  os_memset(&ctx, 0, sizeof(ctx));
  ctx.nonce = f_nonce;
  if (!wpa_auth_for_each_sta(wpa_auth, ft_get_sta_cb, &ctx)) {
    /* nonce not found */
    wpa_printf(MSG_DEBUG, "FT: Invalid nonce");
    return -1;
  }

  ret = wpa_ft_rrb_rx_r1(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_RESP,
             enc, enc_len, auth, auth_len, msgtype, s1kh_id,
             no_defer ? NULL : &wpa_ft_rrb_rx_resp);
  if (ret == -2) {
    ret = 0;
    nak = 1;
  } else {
    nak = 0;
  }
  if (ret < 0)
    return -1;

  ctx.s1kh_id = s1kh_id;
  if (wpa_auth_for_each_sta(wpa_auth, ft_get_sta_cb, &ctx)) {
    wpa_printf(MSG_DEBUG,
         "FT: Response to a pending pull request for " MACSTR,
         MAC2STR(ctx.sm->addr));
    eloop_cancel_timeout(wpa_ft_expire_pull, ctx.sm, NULL);
    if (nak)
      ctx.sm->ft_pending_pull_left_retries = 0;
    ft_finish_pull(ctx.sm);
  }

out:
  return ret;
}


static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
            const u8 *src_addr,
            const u8 *enc, size_t enc_len,
            const u8 *auth, size_t auth_len, int no_defer)
{
  const char *msgtype = "push";

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

  if (wpa_ft_rrb_rx_r1(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_PUSH,
           enc, enc_len, auth, auth_len, msgtype, NULL,
           no_defer ? NULL : wpa_ft_rrb_rx_push) < 0)
    return -1;

  return 0;
}


static int wpa_ft_rrb_rx_seq(struct wpa_authenticator *wpa_auth,
           const u8 *src_addr, int type,
           const u8 *enc, size_t enc_len,
           const u8 *auth, size_t auth_len,
           struct ft_remote_seq **rkh_seq,
           u8 **key, size_t *key_len,
           struct ft_remote_r0kh **r0kh_out,
           struct ft_remote_r1kh **r1kh_out,
           struct ft_remote_r0kh **r0kh_wildcard_out,
           struct ft_remote_r1kh **r1kh_wildcard_out)
{
  struct ft_remote_r0kh *r0kh = NULL;
  struct ft_remote_r1kh *r1kh = NULL;
  const u8 *f_r0kh_id, *f_r1kh_id;
  size_t f_r0kh_id_len, f_r1kh_id_len;
  int to_r0kh, to_r1kh;
  u8 *plain = NULL;
  size_t plain_len = 0;
  struct ft_remote_r0kh *r0kh_wildcard;
  struct ft_remote_r1kh *r1kh_wildcard;

  RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, "seq", -1);
  RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, "seq", FT_R1KH_ID_LEN);

  to_r0kh = !wpa_ft_rrb_check_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len);
  to_r1kh = !wpa_ft_rrb_check_r1kh(wpa_auth, f_r1kh_id);

  if (to_r0kh && to_r1kh) {
    wpa_printf(MSG_DEBUG, "FT: seq - local R0KH-ID and R1KH-ID");
    goto out;
  }

  if (!to_r0kh && !to_r1kh) {
    wpa_printf(MSG_DEBUG, "FT: seq - remote R0KH-ID and R1KH-ID");
    goto out;
  }

  if (!to_r0kh) {
    wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len,
               &r0kh, &r0kh_wildcard);
    if (!r0kh_wildcard &&
        (!r0kh || !ether_addr_equal(r0kh->addr, src_addr))) {
      wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
            f_r0kh_id, f_r0kh_id_len);
      goto out;
    }
    if (r0kh) {
      *key = r0kh->key;
      *key_len = sizeof(r0kh->key);
    } else {
      *key = r0kh_wildcard->key;
      *key_len = sizeof(r0kh_wildcard->key);
    }
  }

  if (!to_r1kh) {
    wpa_ft_rrb_lookup_r1kh(wpa_auth, f_r1kh_id, &r1kh,
               &r1kh_wildcard);
    if (!r1kh_wildcard &&
        (!r1kh || !ether_addr_equal(r1kh->addr, src_addr))) {
      wpa_hexdump(MSG_DEBUG, "FT: Did not find R1KH-ID",
            f_r1kh_id, FT_R1KH_ID_LEN);
      goto out;
    }
    if (r1kh) {
      *key = r1kh->key;
      *key_len = sizeof(r1kh->key);
    } else {
      *key = r1kh_wildcard->key;
      *key_len = sizeof(r1kh_wildcard->key);
    }
  }

  if (wpa_ft_rrb_decrypt(*key, *key_len, enc, enc_len, auth, auth_len,
             src_addr, type, &plain, &plain_len) < 0)
    goto out;

  os_free(plain);

  if (!to_r0kh) {
    if (!r0kh)
      r0kh = wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard,
               src_addr, f_r0kh_id,
               f_r0kh_id_len,
               ftRRBseqTimeout);
    if (!r0kh)
      goto out;

    wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh, ftRRBseqTimeout);
    *rkh_seq = r0kh->seq;
    if (r0kh_out)
      *r0kh_out = r0kh;
    if (r0kh_wildcard_out)
      *r0kh_wildcard_out = r0kh_wildcard;
  }

  if (!to_r1kh) {
    if (!r1kh)
      r1kh = wpa_ft_rrb_add_r1kh(wpa_auth, r1kh_wildcard,
               src_addr, f_r1kh_id,
               ftRRBseqTimeout);
    if (!r1kh)
      goto out;

    wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh, ftRRBseqTimeout);
    *rkh_seq = r1kh->seq;
    if (r1kh_out)
      *r1kh_out = r1kh;
    if (r1kh_wildcard_out)
      *r1kh_wildcard_out = r1kh_wildcard;
  }

  return 0;
out:
  return -1;
}


static int wpa_ft_rrb_rx_seq_req(struct wpa_authenticator *wpa_auth,
         const u8 *src_addr,
         const u8 *enc, size_t enc_len,
         const u8 *auth, size_t auth_len,
         int no_defer)
{
  int ret = -1;
  struct ft_rrb_seq f_seq;
  const u8 *f_nonce, *f_r0kh_id, *f_r1kh_id;
  size_t f_nonce_len, f_r0kh_id_len, f_r1kh_id_len;
  struct ft_remote_seq *rkh_seq = NULL;
  u8 *packet = NULL, *key = NULL;
  size_t packet_len = 0, key_len = 0;
  struct tlv_list seq_resp_auth[5];

  wpa_printf(MSG_DEBUG, "FT: Received sequence number request");

  if (wpa_ft_rrb_rx_seq(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
            enc, enc_len, auth, auth_len, &rkh_seq, &key,
            &key_len, NULL, NULL, NULL, NULL) < 0)
    goto out;

  RRB_GET_AUTH(FT_RRB_NONCE, nonce, "seq request", FT_RRB_NONCE_LEN);
  wpa_hexdump(MSG_DEBUG, "FT: seq request - nonce", f_nonce, f_nonce_len);

  RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, "seq", -1);
  RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, "seq", FT_R1KH_ID_LEN);

  if (wpa_ft_new_seq(rkh_seq, &f_seq) < 0) {
    wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
    goto out;
  }

  wpa_printf(MSG_DEBUG, "FT: Send sequence number response from " MACSTR
       " to " MACSTR,
       MAC2STR(wpa_auth->addr), MAC2STR(src_addr));

  seq_resp_auth[0].type = FT_RRB_NONCE;
  seq_resp_auth[0].len = f_nonce_len;
  seq_resp_auth[0].data = f_nonce;
  seq_resp_auth[1].type = FT_RRB_SEQ;
  seq_resp_auth[1].len = sizeof(f_seq);
  seq_resp_auth[1].data = (u8 *) &f_seq;
  seq_resp_auth[2].type = FT_RRB_R0KH_ID;
  seq_resp_auth[2].len = f_r0kh_id_len;
  seq_resp_auth[2].data = f_r0kh_id;
  seq_resp_auth[3].type = FT_RRB_R1KH_ID;
  seq_resp_auth[3].len = FT_R1KH_ID_LEN;
  seq_resp_auth[3].data = f_r1kh_id;
  seq_resp_auth[4].type = FT_RRB_LAST_EMPTY;
  seq_resp_auth[4].len = 0;
  seq_resp_auth[4].data = NULL;

  if (wpa_ft_rrb_build(key, key_len, NULL, NULL, seq_resp_auth, NULL,
           wpa_auth->addr, FT_PACKET_R0KH_R1KH_SEQ_RESP,
           &packet, &packet_len) < 0)
    goto out;

  wpa_ft_rrb_oui_send(wpa_auth, src_addr,
          FT_PACKET_R0KH_R1KH_SEQ_RESP, packet,
          packet_len);

out:
  os_free(packet);

  return ret;
}


static int wpa_ft_rrb_rx_seq_resp(struct wpa_authenticator *wpa_auth,
          const u8 *src_addr,
          const u8 *enc, size_t enc_len,
          const u8 *auth, size_t auth_len,
          int no_defer)
{
  u8 *key = NULL;
  size_t key_len = 0;
  struct ft_remote_r0kh *r0kh = NULL, *r0kh_wildcard = NULL;
  struct ft_remote_r1kh *r1kh = NULL, *r1kh_wildcard = NULL;
  const u8 *f_nonce, *f_seq;
  size_t f_nonce_len, f_seq_len;
  struct ft_remote_seq *rkh_seq = NULL;
  struct ft_remote_item *item;
  struct os_reltime now, now_remote;
  int seq_ret, found;
  const struct ft_rrb_seq *msg_both;
  u32 msg_dom, msg_seq;

  wpa_printf(MSG_DEBUG, "FT: Received sequence number response");

  if (wpa_ft_rrb_rx_seq(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_RESP,
            enc, enc_len, auth, auth_len, &rkh_seq, &key,
            &key_len, &r0kh, &r1kh, &r0kh_wildcard,
            &r1kh_wildcard) < 0)
    goto out;

  RRB_GET_AUTH(FT_RRB_NONCE, nonce, "seq response", FT_RRB_NONCE_LEN);
  wpa_hexdump(MSG_DEBUG, "FT: seq response - nonce", f_nonce,
        f_nonce_len);

  found = 0;
  dl_list_for_each(item, &rkh_seq->rx.queue, struct ft_remote_item,
       list) {
    if (os_memcmp_const(f_nonce, item->nonce,
            FT_RRB_NONCE_LEN) != 0 ||
        os_get_reltime(&now) < 0 ||
        os_reltime_expired(&now, &item->nonce_ts, ftRRBseqTimeout))
      continue;

    found = 1;
    break;
  }
  if (!found) {
    wpa_printf(MSG_DEBUG, "FT: seq response - bad nonce");
    goto out;
  }

  if (r0kh) {
    wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh,
            wpa_auth->conf.rkh_pos_timeout);
    if (r0kh_wildcard)
      os_memcpy(r0kh->addr, src_addr, ETH_ALEN);
  }

  if (r1kh) {
    wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh,
            wpa_auth->conf.rkh_pos_timeout);
    if (r1kh_wildcard)
      os_memcpy(r1kh->addr, src_addr, ETH_ALEN);
  }

  seq_ret = wpa_ft_rrb_seq_chk(rkh_seq, src_addr, enc, enc_len, auth,
             auth_len, "seq response", 1);
  if (seq_ret == FT_RRB_SEQ_OK) {
    wpa_printf(MSG_DEBUG, "FT: seq response - valid seq number");
    wpa_ft_rrb_seq_accept(wpa_auth, rkh_seq, src_addr, auth,
              auth_len, "seq response");
  } else {
    wpa_printf(MSG_DEBUG, "FT: seq response - reset seq number");

    RRB_GET_AUTH(FT_RRB_SEQ, seq, "seq response",
           sizeof(*msg_both));
    msg_both = (const struct ft_rrb_seq *) f_seq;

    msg_dom = le_to_host32(msg_both->dom);
    msg_seq = le_to_host32(msg_both->seq);
    now_remote.sec = le_to_host32(msg_both->ts);
    now_remote.usec = 0;

    rkh_seq->rx.num_last = 2;
    rkh_seq->rx.dom = msg_dom;
    rkh_seq->rx.offsetidx = 0;
    /* Accept some older, possibly cached packets as well */
    rkh_seq->rx.last[0] = msg_seq - FT_REMOTE_SEQ_BACKLOG -
      dl_list_len(&rkh_seq->rx.queue);
    rkh_seq->rx.last[1] = msg_seq;

    /* local time - offset = remote time
     * <=> local time - remote time = offset */
    os_reltime_sub(&now, &now_remote, &rkh_seq->rx.time_offset);
  }

  wpa_ft_rrb_seq_flush(wpa_auth, rkh_seq, 1);

  return 0;
out:
  return -1;
}


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;
  }

  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 (!ether_addr_equal(target_ap_addr, wpa_auth->addr)) {
      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);

    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;
}


void wpa_ft_rrb_oui_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
           const u8 *dst_addr, u8 oui_suffix, const u8 *data,
           size_t data_len)
{
  const u8 *auth, *enc;
  size_t alen, elen;
  int no_defer = 0;

  wpa_printf(MSG_DEBUG, "FT: RRB-OUI(" MACSTR
       ") received frame from remote AP "
       MACSTR " oui_suffix=%u dst=" MACSTR,
       MAC2STR(wpa_auth->addr), MAC2STR(src_addr), oui_suffix,
       MAC2STR(dst_addr));
  wpa_hexdump(MSG_MSGDUMP, "FT: RRB frame payload", data, data_len);

  if (is_multicast_ether_addr(src_addr)) {
    wpa_printf(MSG_DEBUG,
         "FT: RRB-OUI received frame from multicast address "
         MACSTR, MAC2STR(src_addr));
    return;
  }

  if (is_multicast_ether_addr(dst_addr))
    no_defer = 1;

  if (data_len < sizeof(u16)) {
    wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame too short");
    return;
  }

  alen = WPA_GET_LE16(data);
  if (data_len < sizeof(u16) + alen) {
    wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame too short");
    return;
  }

  auth = data + sizeof(u16);
  wpa_hexdump(MSG_MSGDUMP, "FT: Authenticated payload", auth, alen);
  enc = data + sizeof(u16) + alen;
  elen = data_len - sizeof(u16) - alen;
  wpa_hexdump(MSG_MSGDUMP, "FT: Encrypted payload", enc, elen);

  switch (oui_suffix) {
  case FT_PACKET_R0KH_R1KH_PULL:
    wpa_ft_rrb_rx_pull(wpa_auth, src_addr, enc, elen, auth, alen,
           no_defer);
    break;
  case FT_PACKET_R0KH_R1KH_RESP:
    wpa_ft_rrb_rx_resp(wpa_auth, src_addr, enc, elen, auth, alen,
           no_defer);
    break;
  case FT_PACKET_R0KH_R1KH_PUSH:
    wpa_ft_rrb_rx_push(wpa_auth, src_addr, enc, elen, auth, alen,
           no_defer);
    break;
  case FT_PACKET_R0KH_R1KH_SEQ_REQ:
    wpa_ft_rrb_rx_seq_req(wpa_auth, src_addr, enc, elen, auth, alen,
              no_defer);
    break;
  case FT_PACKET_R0KH_R1KH_SEQ_RESP:
    wpa_ft_rrb_rx_seq_resp(wpa_auth, src_addr, enc, elen, auth,
               alen, no_defer);
    break;
  }
}


static int 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)
{
  u8 *packet;
  size_t packet_len;
  struct ft_rrb_seq f_seq;
  struct tlv_list push[] = {
    { .type = FT_RRB_S1KH_ID, .len = ETH_ALEN,
      .data = s1kh_id },
    { .type = FT_RRB_PMK_R0_NAME, .len = WPA_PMK_NAME_LEN,
      .data = pmk_r0->pmk_r0_name },
    { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
  };
  struct tlv_list push_auth[] = {
    { .type = FT_RRB_SEQ, .len = sizeof(f_seq),
      .data = (u8 *) &f_seq },
    { .type = FT_RRB_R0KH_ID,
      .len = wpa_auth->conf.r0_key_holder_len,
      .data = wpa_auth->conf.r0_key_holder },
    { .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
      .data = r1kh->id },
    { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
  };

  if (wpa_ft_new_seq(r1kh->seq, &f_seq) < 0) {
    wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
    return -1;
  }

  wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 push from " MACSTR
       " to remote R0KH address " MACSTR,
       MAC2STR(wpa_auth->addr), MAC2STR(r1kh->addr));

  if (wpa_ft_rrb_build_r0(r1kh->key, sizeof(r1kh->key), push, pmk_r0,
        r1kh->id, s1kh_id, push_auth, wpa_auth->addr,
        FT_PACKET_R0KH_R1KH_PUSH,
        &packet, &packet_len) < 0)
    return -1;

  wpa_ft_rrb_oui_send(wpa_auth, r1kh->addr, FT_PACKET_R0KH_R1KH_PUSH,
          packet, packet_len);

  os_free(packet);
  return 0;
}


void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
{
  struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
  struct wpa_ft_pmk_r0_sa *r0, *r0found = NULL;
  struct ft_remote_r1kh *r1kh;

  if (!wpa_auth->conf.pmk_r1_push)
    return;
  if (!wpa_auth->conf.r1kh_list)
    return;

  dl_list_for_each(r0, &cache->pmk_r0, struct wpa_ft_pmk_r0_sa, list) {
    if (ether_addr_equal(r0->spa, addr)) {
      r0found = r0;
      break;
    }
  }

  r0 = r0found;
  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));

  for (r1kh = *wpa_auth->conf.r1kh_list; r1kh; r1kh = r1kh->next) {
    if (is_zero_ether_addr(r1kh->addr) ||
        is_zero_ether_addr(r1kh->id))
      continue;
    if (wpa_ft_rrb_init_r1kh_seq(r1kh) < 0)
      continue;
    wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr);
  }
}

#endif /* CONFIG_IEEE80211R_AP */

Coverage Report

Created: 2026-06-15 06:18