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591 lines
14 KiB
591 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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Copyright (c) 2011,2012 Intel Corp. |
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|
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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 <crypto/hash.h> |
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#include "hci_request.h" |
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#include "a2mp.h" |
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#include "amp.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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kref_read(&ctrl->kref)); |
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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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kref_read(&ctrl->kref)); |
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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, u8 id) |
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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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kref_init(&ctrl->kref); |
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ctrl->id = id; |
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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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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 %u", 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, bool out) |
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{ |
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bdaddr_t *dst = &mgr->l2cap_conn->hcon->dst; |
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struct hci_conn *hcon; |
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u8 role = out ? HCI_ROLE_MASTER : HCI_ROLE_SLAVE; |
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hcon = hci_conn_add(hdev, AMP_LINK, dst, role); |
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if (!hcon) |
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return NULL; |
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BT_DBG("hcon %p dst %pMR", hcon, dst); |
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hcon->state = BT_CONNECT; |
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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 = amp_mgr_get(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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struct crypto_shash *tfm; |
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struct shash_desc *shash; |
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int ret; |
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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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goto failed; |
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} |
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shash = kzalloc(sizeof(*shash) + crypto_shash_descsize(tfm), |
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GFP_KERNEL); |
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if (!shash) { |
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ret = -ENOMEM; |
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goto failed; |
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} |
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shash->tfm = tfm; |
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ret = crypto_shash_digest(shash, plaintext, psize, output); |
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kfree(shash); |
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failed: |
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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_dev_err(hdev, "legacy key type %u", 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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if (!key) { |
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BT_DBG("No Link key for conn %p dst %pMR", conn, &conn->dst); |
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return -EACCES; |
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} |
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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_dev_err(hdev, "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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static void read_local_amp_assoc_complete(struct hci_dev *hdev, u8 status, |
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u16 opcode, struct sk_buff *skb) |
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{ |
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struct hci_rp_read_local_amp_assoc *rp = (void *)skb->data; |
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struct amp_assoc *assoc = &hdev->loc_assoc; |
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size_t rem_len, frag_len; |
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BT_DBG("%s status 0x%2.2x", hdev->name, rp->status); |
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if (rp->status) |
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goto send_rsp; |
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frag_len = skb->len - sizeof(*rp); |
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rem_len = __le16_to_cpu(rp->rem_len); |
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if (rem_len > frag_len) { |
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BT_DBG("frag_len %zu rem_len %zu", frag_len, rem_len); |
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memcpy(assoc->data + assoc->offset, rp->frag, frag_len); |
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assoc->offset += frag_len; |
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/* Read other fragments */ |
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amp_read_loc_assoc_frag(hdev, rp->phy_handle); |
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return; |
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} |
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memcpy(assoc->data + assoc->offset, rp->frag, rem_len); |
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assoc->len = assoc->offset + rem_len; |
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assoc->offset = 0; |
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send_rsp: |
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/* Send A2MP Rsp when all fragments are received */ |
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a2mp_send_getampassoc_rsp(hdev, rp->status); |
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a2mp_send_create_phy_link_req(hdev, rp->status); |
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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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struct hci_request req; |
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int err; |
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BT_DBG("%s handle %u", 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_req_init(&req, hdev); |
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hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp); |
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err = hci_req_run_skb(&req, read_local_amp_assoc_complete); |
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if (err < 0) |
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a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID); |
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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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struct hci_request req; |
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int err; |
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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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set_bit(READ_LOC_AMP_ASSOC, &mgr->state); |
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hci_req_init(&req, hdev); |
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hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp); |
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err = hci_req_run_skb(&req, read_local_amp_assoc_complete); |
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if (err < 0) |
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a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID); |
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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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struct hci_request req; |
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int err; |
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if (!mgr) |
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return; |
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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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set_bit(READ_LOC_AMP_ASSOC_FINAL, &mgr->state); |
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/* Read Local AMP Assoc final link information data */ |
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hci_req_init(&req, hdev); |
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hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp); |
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err = hci_req_run_skb(&req, read_local_amp_assoc_complete); |
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if (err < 0) |
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a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID); |
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} |
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static void write_remote_amp_assoc_complete(struct hci_dev *hdev, u8 status, |
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u16 opcode, struct sk_buff *skb) |
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{ |
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struct hci_rp_write_remote_amp_assoc *rp = (void *)skb->data; |
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BT_DBG("%s status 0x%2.2x phy_handle 0x%2.2x", |
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hdev->name, rp->status, rp->phy_handle); |
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if (rp->status) |
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return; |
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amp_write_rem_assoc_continue(hdev, rp->phy_handle); |
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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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struct hci_request req; |
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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_req_init(&req, hdev); |
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hci_req_add(&req, HCI_OP_WRITE_REMOTE_AMP_ASSOC, len, cp); |
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hci_req_run_skb(&req, write_remote_amp_assoc_complete); |
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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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/* Send A2MP create phylink rsp when all fragments are written */ |
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if (amp_write_rem_assoc_frag(hdev, hcon)) |
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a2mp_send_create_phy_link_rsp(hdev, 0); |
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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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static void create_phylink_complete(struct hci_dev *hdev, u8 status, |
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u16 opcode) |
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{ |
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struct hci_cp_create_phy_link *cp; |
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BT_DBG("%s status 0x%2.2x", hdev->name, status); |
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cp = hci_sent_cmd_data(hdev, HCI_OP_CREATE_PHY_LINK); |
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if (!cp) |
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return; |
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hci_dev_lock(hdev); |
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if (status) { |
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struct hci_conn *hcon; |
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hcon = hci_conn_hash_lookup_handle(hdev, cp->phy_handle); |
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if (hcon) |
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hci_conn_del(hcon); |
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} else { |
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amp_write_remote_assoc(hdev, cp->phy_handle); |
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} |
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hci_dev_unlock(hdev); |
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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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struct hci_request req; |
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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_req_init(&req, hdev); |
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hci_req_add(&req, HCI_OP_CREATE_PHY_LINK, sizeof(cp), &cp); |
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hci_req_run(&req, create_phylink_complete); |
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} |
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static void accept_phylink_complete(struct hci_dev *hdev, u8 status, |
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u16 opcode) |
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{ |
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struct hci_cp_accept_phy_link *cp; |
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BT_DBG("%s status 0x%2.2x", hdev->name, status); |
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if (status) |
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return; |
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cp = hci_sent_cmd_data(hdev, HCI_OP_ACCEPT_PHY_LINK); |
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if (!cp) |
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return; |
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amp_write_remote_assoc(hdev, cp->phy_handle); |
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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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struct hci_request req; |
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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_req_init(&req, hdev); |
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hci_req_add(&req, HCI_OP_ACCEPT_PHY_LINK, sizeof(cp), &cp); |
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hci_req_run(&req, accept_phylink_complete); |
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} |
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void amp_physical_cfm(struct hci_conn *bredr_hcon, struct hci_conn *hs_hcon) |
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{ |
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struct hci_dev *bredr_hdev = hci_dev_hold(bredr_hcon->hdev); |
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struct amp_mgr *mgr = hs_hcon->amp_mgr; |
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struct l2cap_chan *bredr_chan; |
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BT_DBG("bredr_hcon %p hs_hcon %p mgr %p", bredr_hcon, hs_hcon, mgr); |
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if (!bredr_hdev || !mgr || !mgr->bredr_chan) |
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return; |
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bredr_chan = mgr->bredr_chan; |
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l2cap_chan_lock(bredr_chan); |
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set_bit(FLAG_EFS_ENABLE, &bredr_chan->flags); |
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bredr_chan->remote_amp_id = hs_hcon->remote_id; |
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bredr_chan->local_amp_id = hs_hcon->hdev->id; |
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bredr_chan->hs_hcon = hs_hcon; |
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bredr_chan->conn->mtu = hs_hcon->hdev->block_mtu; |
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__l2cap_physical_cfm(bredr_chan, 0); |
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l2cap_chan_unlock(bredr_chan); |
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hci_dev_put(bredr_hdev); |
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} |
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void amp_create_logical_link(struct l2cap_chan *chan) |
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{ |
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struct hci_conn *hs_hcon = chan->hs_hcon; |
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struct hci_cp_create_accept_logical_link cp; |
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struct hci_dev *hdev; |
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BT_DBG("chan %p hs_hcon %p dst %pMR", chan, hs_hcon, |
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&chan->conn->hcon->dst); |
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if (!hs_hcon) |
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return; |
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hdev = hci_dev_hold(chan->hs_hcon->hdev); |
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if (!hdev) |
|
return; |
|
|
|
cp.phy_handle = hs_hcon->handle; |
|
|
|
cp.tx_flow_spec.id = chan->local_id; |
|
cp.tx_flow_spec.stype = chan->local_stype; |
|
cp.tx_flow_spec.msdu = cpu_to_le16(chan->local_msdu); |
|
cp.tx_flow_spec.sdu_itime = cpu_to_le32(chan->local_sdu_itime); |
|
cp.tx_flow_spec.acc_lat = cpu_to_le32(chan->local_acc_lat); |
|
cp.tx_flow_spec.flush_to = cpu_to_le32(chan->local_flush_to); |
|
|
|
cp.rx_flow_spec.id = chan->remote_id; |
|
cp.rx_flow_spec.stype = chan->remote_stype; |
|
cp.rx_flow_spec.msdu = cpu_to_le16(chan->remote_msdu); |
|
cp.rx_flow_spec.sdu_itime = cpu_to_le32(chan->remote_sdu_itime); |
|
cp.rx_flow_spec.acc_lat = cpu_to_le32(chan->remote_acc_lat); |
|
cp.rx_flow_spec.flush_to = cpu_to_le32(chan->remote_flush_to); |
|
|
|
if (hs_hcon->out) |
|
hci_send_cmd(hdev, HCI_OP_CREATE_LOGICAL_LINK, sizeof(cp), |
|
&cp); |
|
else |
|
hci_send_cmd(hdev, HCI_OP_ACCEPT_LOGICAL_LINK, sizeof(cp), |
|
&cp); |
|
|
|
hci_dev_put(hdev); |
|
} |
|
|
|
void amp_disconnect_logical_link(struct hci_chan *hchan) |
|
{ |
|
struct hci_conn *hcon = hchan->conn; |
|
struct hci_cp_disconn_logical_link cp; |
|
|
|
if (hcon->state != BT_CONNECTED) { |
|
BT_DBG("hchan %p not connected", hchan); |
|
return; |
|
} |
|
|
|
cp.log_handle = cpu_to_le16(hchan->handle); |
|
hci_send_cmd(hcon->hdev, HCI_OP_DISCONN_LOGICAL_LINK, sizeof(cp), &cp); |
|
} |
|
|
|
void amp_destroy_logical_link(struct hci_chan *hchan, u8 reason) |
|
{ |
|
BT_DBG("hchan %p", hchan); |
|
|
|
hci_chan_del(hchan); |
|
}
|
|
|