368 lines
8.5 KiB
C
368 lines
8.5 KiB
C
/*
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Copyright (c) 2011,2012 Intel Corp.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 and
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only version 2 as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci.h>
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#include <net/bluetooth/hci_core.h>
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#include <net/bluetooth/a2mp.h>
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#include <net/bluetooth/amp.h>
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#include <crypto/hash.h>
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/* Remote AMP Controllers interface */
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void amp_ctrl_get(struct amp_ctrl *ctrl)
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{
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BT_DBG("ctrl %p orig refcnt %d", ctrl,
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atomic_read(&ctrl->kref.refcount));
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kref_get(&ctrl->kref);
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}
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static void amp_ctrl_destroy(struct kref *kref)
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{
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struct amp_ctrl *ctrl = container_of(kref, struct amp_ctrl, kref);
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BT_DBG("ctrl %p", ctrl);
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kfree(ctrl->assoc);
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kfree(ctrl);
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}
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int amp_ctrl_put(struct amp_ctrl *ctrl)
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{
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BT_DBG("ctrl %p orig refcnt %d", ctrl,
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atomic_read(&ctrl->kref.refcount));
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return kref_put(&ctrl->kref, &_ctrl_destroy);
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}
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struct amp_ctrl *amp_ctrl_add(struct amp_mgr *mgr)
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{
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struct amp_ctrl *ctrl;
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ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
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if (!ctrl)
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return NULL;
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mutex_lock(&mgr->amp_ctrls_lock);
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list_add(&ctrl->list, &mgr->amp_ctrls);
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mutex_unlock(&mgr->amp_ctrls_lock);
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kref_init(&ctrl->kref);
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BT_DBG("mgr %p ctrl %p", mgr, ctrl);
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return ctrl;
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}
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void amp_ctrl_list_flush(struct amp_mgr *mgr)
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{
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struct amp_ctrl *ctrl, *n;
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BT_DBG("mgr %p", mgr);
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mutex_lock(&mgr->amp_ctrls_lock);
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list_for_each_entry_safe(ctrl, n, &mgr->amp_ctrls, list) {
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list_del(&ctrl->list);
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amp_ctrl_put(ctrl);
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}
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mutex_unlock(&mgr->amp_ctrls_lock);
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}
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struct amp_ctrl *amp_ctrl_lookup(struct amp_mgr *mgr, u8 id)
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{
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struct amp_ctrl *ctrl;
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BT_DBG("mgr %p id %d", mgr, id);
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mutex_lock(&mgr->amp_ctrls_lock);
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list_for_each_entry(ctrl, &mgr->amp_ctrls, list) {
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if (ctrl->id == id) {
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amp_ctrl_get(ctrl);
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mutex_unlock(&mgr->amp_ctrls_lock);
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return ctrl;
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}
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}
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mutex_unlock(&mgr->amp_ctrls_lock);
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return NULL;
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}
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/* Physical Link interface */
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static u8 __next_handle(struct amp_mgr *mgr)
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{
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if (++mgr->handle == 0)
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mgr->handle = 1;
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return mgr->handle;
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}
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struct hci_conn *phylink_add(struct hci_dev *hdev, struct amp_mgr *mgr,
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u8 remote_id)
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{
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bdaddr_t *dst = mgr->l2cap_conn->dst;
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struct hci_conn *hcon;
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hcon = hci_conn_add(hdev, AMP_LINK, dst);
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if (!hcon)
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return NULL;
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hcon->state = BT_CONNECT;
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hcon->out = true;
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hcon->attempt++;
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hcon->handle = __next_handle(mgr);
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hcon->remote_id = remote_id;
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hcon->amp_mgr = mgr;
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return hcon;
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}
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/* AMP crypto key generation interface */
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static int hmac_sha256(u8 *key, u8 ksize, char *plaintext, u8 psize, u8 *output)
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{
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int ret = 0;
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struct crypto_shash *tfm;
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if (!ksize)
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return -EINVAL;
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tfm = crypto_alloc_shash("hmac(sha256)", 0, 0);
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if (IS_ERR(tfm)) {
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BT_DBG("crypto_alloc_ahash failed: err %ld", PTR_ERR(tfm));
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return PTR_ERR(tfm);
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}
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ret = crypto_shash_setkey(tfm, key, ksize);
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if (ret) {
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BT_DBG("crypto_ahash_setkey failed: err %d", ret);
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} else {
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struct {
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struct shash_desc shash;
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char ctx[crypto_shash_descsize(tfm)];
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} desc;
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desc.shash.tfm = tfm;
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desc.shash.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
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ret = crypto_shash_digest(&desc.shash, plaintext, psize,
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output);
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}
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crypto_free_shash(tfm);
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return ret;
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}
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int phylink_gen_key(struct hci_conn *conn, u8 *data, u8 *len, u8 *type)
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{
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struct hci_dev *hdev = conn->hdev;
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struct link_key *key;
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u8 keybuf[HCI_AMP_LINK_KEY_SIZE];
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u8 gamp_key[HCI_AMP_LINK_KEY_SIZE];
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int err;
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if (!hci_conn_check_link_mode(conn))
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return -EACCES;
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BT_DBG("conn %p key_type %d", conn, conn->key_type);
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/* Legacy key */
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if (conn->key_type < 3) {
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BT_ERR("Legacy key type %d", conn->key_type);
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return -EACCES;
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}
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*type = conn->key_type;
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*len = HCI_AMP_LINK_KEY_SIZE;
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key = hci_find_link_key(hdev, &conn->dst);
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/* BR/EDR Link Key concatenated together with itself */
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memcpy(&keybuf[0], key->val, HCI_LINK_KEY_SIZE);
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memcpy(&keybuf[HCI_LINK_KEY_SIZE], key->val, HCI_LINK_KEY_SIZE);
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/* Derive Generic AMP Link Key (gamp) */
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err = hmac_sha256(keybuf, HCI_AMP_LINK_KEY_SIZE, "gamp", 4, gamp_key);
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if (err) {
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BT_ERR("Could not derive Generic AMP Key: err %d", err);
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return err;
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}
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if (conn->key_type == HCI_LK_DEBUG_COMBINATION) {
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BT_DBG("Use Generic AMP Key (gamp)");
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memcpy(data, gamp_key, HCI_AMP_LINK_KEY_SIZE);
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return err;
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}
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/* Derive Dedicated AMP Link Key: "802b" is 802.11 PAL keyID */
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return hmac_sha256(gamp_key, HCI_AMP_LINK_KEY_SIZE, "802b", 4, data);
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}
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void amp_read_loc_assoc_frag(struct hci_dev *hdev, u8 phy_handle)
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{
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struct hci_cp_read_local_amp_assoc cp;
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struct amp_assoc *loc_assoc = &hdev->loc_assoc;
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BT_DBG("%s handle %d", hdev->name, phy_handle);
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cp.phy_handle = phy_handle;
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cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
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cp.len_so_far = cpu_to_le16(loc_assoc->offset);
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hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
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}
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void amp_read_loc_assoc(struct hci_dev *hdev, struct amp_mgr *mgr)
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{
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struct hci_cp_read_local_amp_assoc cp;
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memset(&hdev->loc_assoc, 0, sizeof(struct amp_assoc));
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memset(&cp, 0, sizeof(cp));
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cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
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mgr->state = READ_LOC_AMP_ASSOC;
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hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
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}
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void amp_read_loc_assoc_final_data(struct hci_dev *hdev,
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struct hci_conn *hcon)
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{
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struct hci_cp_read_local_amp_assoc cp;
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struct amp_mgr *mgr = hcon->amp_mgr;
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cp.phy_handle = hcon->handle;
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cp.len_so_far = cpu_to_le16(0);
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cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
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mgr->state = READ_LOC_AMP_ASSOC_FINAL;
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/* Read Local AMP Assoc final link information data */
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hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
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}
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/* Write AMP Assoc data fragments, returns true with last fragment written*/
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static bool amp_write_rem_assoc_frag(struct hci_dev *hdev,
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struct hci_conn *hcon)
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{
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struct hci_cp_write_remote_amp_assoc *cp;
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struct amp_mgr *mgr = hcon->amp_mgr;
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struct amp_ctrl *ctrl;
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u16 frag_len, len;
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ctrl = amp_ctrl_lookup(mgr, hcon->remote_id);
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if (!ctrl)
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return false;
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if (!ctrl->assoc_rem_len) {
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BT_DBG("all fragments are written");
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ctrl->assoc_rem_len = ctrl->assoc_len;
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ctrl->assoc_len_so_far = 0;
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amp_ctrl_put(ctrl);
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return true;
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}
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frag_len = min_t(u16, 248, ctrl->assoc_rem_len);
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len = frag_len + sizeof(*cp);
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cp = kzalloc(len, GFP_KERNEL);
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if (!cp) {
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amp_ctrl_put(ctrl);
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return false;
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}
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BT_DBG("hcon %p ctrl %p frag_len %u assoc_len %u rem_len %u",
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hcon, ctrl, frag_len, ctrl->assoc_len, ctrl->assoc_rem_len);
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cp->phy_handle = hcon->handle;
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cp->len_so_far = cpu_to_le16(ctrl->assoc_len_so_far);
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cp->rem_len = cpu_to_le16(ctrl->assoc_rem_len);
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memcpy(cp->frag, ctrl->assoc, frag_len);
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ctrl->assoc_len_so_far += frag_len;
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ctrl->assoc_rem_len -= frag_len;
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amp_ctrl_put(ctrl);
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hci_send_cmd(hdev, HCI_OP_WRITE_REMOTE_AMP_ASSOC, len, cp);
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kfree(cp);
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return false;
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}
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void amp_write_rem_assoc_continue(struct hci_dev *hdev, u8 handle)
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{
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struct hci_conn *hcon;
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BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
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hcon = hci_conn_hash_lookup_handle(hdev, handle);
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if (!hcon)
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return;
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amp_write_rem_assoc_frag(hdev, hcon);
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}
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void amp_write_remote_assoc(struct hci_dev *hdev, u8 handle)
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{
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struct hci_conn *hcon;
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BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
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hcon = hci_conn_hash_lookup_handle(hdev, handle);
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if (!hcon)
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return;
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BT_DBG("%s phy handle 0x%2.2x hcon %p", hdev->name, handle, hcon);
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amp_write_rem_assoc_frag(hdev, hcon);
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}
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void amp_create_phylink(struct hci_dev *hdev, struct amp_mgr *mgr,
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struct hci_conn *hcon)
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{
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struct hci_cp_create_phy_link cp;
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cp.phy_handle = hcon->handle;
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BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
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hcon->handle);
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if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
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&cp.key_type)) {
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BT_DBG("Cannot create link key");
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return;
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}
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hci_send_cmd(hdev, HCI_OP_CREATE_PHY_LINK, sizeof(cp), &cp);
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}
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void amp_accept_phylink(struct hci_dev *hdev, struct amp_mgr *mgr,
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struct hci_conn *hcon)
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{
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struct hci_cp_accept_phy_link cp;
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cp.phy_handle = hcon->handle;
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BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
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hcon->handle);
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if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
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&cp.key_type)) {
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BT_DBG("Cannot create link key");
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return;
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}
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hci_send_cmd(hdev, HCI_OP_ACCEPT_PHY_LINK, sizeof(cp), &cp);
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}
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