| /* |
| Copyright (c) 2010,2011 Code Aurora Forum. All rights reserved. |
| Copyright (c) 2011,2012 Intel Corp. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License version 2 and |
| only version 2 as published by the Free Software Foundation. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| */ |
| |
| #include <net/bluetooth/bluetooth.h> |
| #include <net/bluetooth/hci_core.h> |
| #include <net/bluetooth/l2cap.h> |
| |
| #include "hci_request.h" |
| #include "a2mp.h" |
| #include "amp.h" |
| |
| #define A2MP_FEAT_EXT 0x8000 |
| |
| /* Global AMP Manager list */ |
| static LIST_HEAD(amp_mgr_list); |
| static DEFINE_MUTEX(amp_mgr_list_lock); |
| |
| /* A2MP build & send command helper functions */ |
| static struct a2mp_cmd *__a2mp_build(u8 code, u8 ident, u16 len, void *data) |
| { |
| struct a2mp_cmd *cmd; |
| int plen; |
| |
| plen = sizeof(*cmd) + len; |
| cmd = kzalloc(plen, GFP_KERNEL); |
| if (!cmd) |
| return NULL; |
| |
| cmd->code = code; |
| cmd->ident = ident; |
| cmd->len = cpu_to_le16(len); |
| |
| memcpy(cmd->data, data, len); |
| |
| return cmd; |
| } |
| |
| static void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len, void *data) |
| { |
| struct l2cap_chan *chan = mgr->a2mp_chan; |
| struct a2mp_cmd *cmd; |
| u16 total_len = len + sizeof(*cmd); |
| struct kvec iv; |
| struct msghdr msg; |
| |
| cmd = __a2mp_build(code, ident, len, data); |
| if (!cmd) |
| return; |
| |
| iv.iov_base = cmd; |
| iv.iov_len = total_len; |
| |
| memset(&msg, 0, sizeof(msg)); |
| |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,0) |
| iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, &iv, 1, total_len); |
| #else |
| msg.msg_iov = (struct iovec *) &iv; |
| msg.msg_iovlen = 1; |
| #endif |
| |
| l2cap_chan_send(chan, &msg, total_len); |
| |
| kfree(cmd); |
| } |
| |
| static u8 __next_ident(struct amp_mgr *mgr) |
| { |
| if (++mgr->ident == 0) |
| mgr->ident = 1; |
| |
| return mgr->ident; |
| } |
| |
| static struct amp_mgr *amp_mgr_lookup_by_state(u8 state) |
| { |
| struct amp_mgr *mgr; |
| |
| mutex_lock(&_mgr_list_lock); |
| list_for_each_entry(mgr, &_mgr_list, list) { |
| if (test_and_clear_bit(state, &mgr->state)) { |
| amp_mgr_get(mgr); |
| mutex_unlock(&_mgr_list_lock); |
| return mgr; |
| } |
| } |
| mutex_unlock(&_mgr_list_lock); |
| |
| return NULL; |
| } |
| |
| /* hci_dev_list shall be locked */ |
| static void __a2mp_add_cl(struct amp_mgr *mgr, struct a2mp_cl *cl) |
| { |
| struct hci_dev *hdev; |
| int i = 1; |
| |
| cl[0].id = AMP_ID_BREDR; |
| cl[0].type = AMP_TYPE_BREDR; |
| cl[0].status = AMP_STATUS_BLUETOOTH_ONLY; |
| |
| list_for_each_entry(hdev, &hci_dev_list, list) { |
| if (hdev->dev_type == HCI_AMP) { |
| cl[i].id = hdev->id; |
| cl[i].type = hdev->amp_type; |
| if (test_bit(HCI_UP, &hdev->flags)) |
| cl[i].status = hdev->amp_status; |
| else |
| cl[i].status = AMP_STATUS_POWERED_DOWN; |
| i++; |
| } |
| } |
| } |
| |
| /* Processing A2MP messages */ |
| static int a2mp_command_rej(struct amp_mgr *mgr, struct sk_buff *skb, |
| struct a2mp_cmd *hdr) |
| { |
| struct a2mp_cmd_rej *rej = (void *) skb->data; |
| |
| if (le16_to_cpu(hdr->len) < sizeof(*rej)) |
| return -EINVAL; |
| |
| BT_DBG("ident %d reason %d", hdr->ident, le16_to_cpu(rej->reason)); |
| |
| skb_pull(skb, sizeof(*rej)); |
| |
| return 0; |
| } |
| |
| static int a2mp_discover_req(struct amp_mgr *mgr, struct sk_buff *skb, |
| struct a2mp_cmd *hdr) |
| { |
| struct a2mp_discov_req *req = (void *) skb->data; |
| u16 len = le16_to_cpu(hdr->len); |
| struct a2mp_discov_rsp *rsp; |
| u16 ext_feat; |
| u8 num_ctrl; |
| struct hci_dev *hdev; |
| |
| if (len < sizeof(*req)) |
| return -EINVAL; |
| |
| skb_pull(skb, sizeof(*req)); |
| |
| ext_feat = le16_to_cpu(req->ext_feat); |
| |
| BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(req->mtu), ext_feat); |
| |
| /* check that packet is not broken for now */ |
| while (ext_feat & A2MP_FEAT_EXT) { |
| if (len < sizeof(ext_feat)) |
| return -EINVAL; |
| |
| ext_feat = get_unaligned_le16(skb->data); |
| BT_DBG("efm 0x%4.4x", ext_feat); |
| len -= sizeof(ext_feat); |
| skb_pull(skb, sizeof(ext_feat)); |
| } |
| |
| read_lock(&hci_dev_list_lock); |
| |
| /* at minimum the BR/EDR needs to be listed */ |
| num_ctrl = 1; |
| |
| list_for_each_entry(hdev, &hci_dev_list, list) { |
| if (hdev->dev_type == HCI_AMP) |
| num_ctrl++; |
| } |
| |
| len = num_ctrl * sizeof(struct a2mp_cl) + sizeof(*rsp); |
| rsp = kmalloc(len, GFP_ATOMIC); |
| if (!rsp) { |
| read_unlock(&hci_dev_list_lock); |
| return -ENOMEM; |
| } |
| |
| rsp->mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU); |
| rsp->ext_feat = 0; |
| |
| __a2mp_add_cl(mgr, rsp->cl); |
| |
| read_unlock(&hci_dev_list_lock); |
| |
| a2mp_send(mgr, A2MP_DISCOVER_RSP, hdr->ident, len, rsp); |
| |
| kfree(rsp); |
| return 0; |
| } |
| |
| static int a2mp_discover_rsp(struct amp_mgr *mgr, struct sk_buff *skb, |
| struct a2mp_cmd *hdr) |
| { |
| struct a2mp_discov_rsp *rsp = (void *) skb->data; |
| u16 len = le16_to_cpu(hdr->len); |
| struct a2mp_cl *cl; |
| u16 ext_feat; |
| bool found = false; |
| |
| if (len < sizeof(*rsp)) |
| return -EINVAL; |
| |
| len -= sizeof(*rsp); |
| skb_pull(skb, sizeof(*rsp)); |
| |
| ext_feat = le16_to_cpu(rsp->ext_feat); |
| |
| BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(rsp->mtu), ext_feat); |
| |
| /* check that packet is not broken for now */ |
| while (ext_feat & A2MP_FEAT_EXT) { |
| if (len < sizeof(ext_feat)) |
| return -EINVAL; |
| |
| ext_feat = get_unaligned_le16(skb->data); |
| BT_DBG("efm 0x%4.4x", ext_feat); |
| len -= sizeof(ext_feat); |
| skb_pull(skb, sizeof(ext_feat)); |
| } |
| |
| cl = (void *) skb->data; |
| while (len >= sizeof(*cl)) { |
| BT_DBG("Remote AMP id %d type %d status %d", cl->id, cl->type, |
| cl->status); |
| |
| if (cl->id != AMP_ID_BREDR && cl->type != AMP_TYPE_BREDR) { |
| struct a2mp_info_req req; |
| |
| found = true; |
| req.id = cl->id; |
| a2mp_send(mgr, A2MP_GETINFO_REQ, __next_ident(mgr), |
| sizeof(req), &req); |
| } |
| |
| len -= sizeof(*cl); |
| cl = (void *) skb_pull(skb, sizeof(*cl)); |
| } |
| |
| /* Fall back to L2CAP init sequence */ |
| if (!found) { |
| struct l2cap_conn *conn = mgr->l2cap_conn; |
| struct l2cap_chan *chan; |
| |
| mutex_lock(&conn->chan_lock); |
| |
| list_for_each_entry(chan, &conn->chan_l, list) { |
| |
| BT_DBG("chan %p state %s", chan, |
| state_to_string(chan->state)); |
| |
| if (chan->scid == L2CAP_CID_A2MP) |
| continue; |
| |
| l2cap_chan_lock(chan); |
| |
| if (chan->state == BT_CONNECT) |
| l2cap_send_conn_req(chan); |
| |
| l2cap_chan_unlock(chan); |
| } |
| |
| mutex_unlock(&conn->chan_lock); |
| } |
| |
| return 0; |
| } |
| |
| static int a2mp_change_notify(struct amp_mgr *mgr, struct sk_buff *skb, |
| struct a2mp_cmd *hdr) |
| { |
| struct a2mp_cl *cl = (void *) skb->data; |
| |
| while (skb->len >= sizeof(*cl)) { |
| BT_DBG("Controller id %d type %d status %d", cl->id, cl->type, |
| cl->status); |
| cl = (struct a2mp_cl *) skb_pull(skb, sizeof(*cl)); |
| } |
| |
| /* TODO send A2MP_CHANGE_RSP */ |
| |
| return 0; |
| } |
| |
| static void read_local_amp_info_complete(struct hci_dev *hdev, u8 status, |
| u16 opcode) |
| { |
| BT_DBG("%s status 0x%2.2x", hdev->name, status); |
| |
| a2mp_send_getinfo_rsp(hdev); |
| } |
| |
| static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb, |
| struct a2mp_cmd *hdr) |
| { |
| struct a2mp_info_req *req = (void *) skb->data; |
| struct hci_dev *hdev; |
| struct hci_request hreq; |
| int err = 0; |
| |
| if (le16_to_cpu(hdr->len) < sizeof(*req)) |
| return -EINVAL; |
| |
| BT_DBG("id %d", req->id); |
| |
| hdev = hci_dev_get(req->id); |
| if (!hdev || hdev->dev_type != HCI_AMP) { |
| struct a2mp_info_rsp rsp; |
| |
| rsp.id = req->id; |
| rsp.status = A2MP_STATUS_INVALID_CTRL_ID; |
| |
| a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp), |
| &rsp); |
| |
| goto done; |
| } |
| |
| set_bit(READ_LOC_AMP_INFO, &mgr->state); |
| hci_req_init(&hreq, hdev); |
| hci_req_add(&hreq, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL); |
| err = hci_req_run(&hreq, read_local_amp_info_complete); |
| if (err < 0) |
| a2mp_send_getinfo_rsp(hdev); |
| |
| done: |
| if (hdev) |
| hci_dev_put(hdev); |
| |
| skb_pull(skb, sizeof(*req)); |
| return 0; |
| } |
| |
| static int a2mp_getinfo_rsp(struct amp_mgr *mgr, struct sk_buff *skb, |
| struct a2mp_cmd *hdr) |
| { |
| struct a2mp_info_rsp *rsp = (struct a2mp_info_rsp *) skb->data; |
| struct a2mp_amp_assoc_req req; |
| struct amp_ctrl *ctrl; |
| |
| if (le16_to_cpu(hdr->len) < sizeof(*rsp)) |
| return -EINVAL; |
| |
| BT_DBG("id %d status 0x%2.2x", rsp->id, rsp->status); |
| |
| if (rsp->status) |
| return -EINVAL; |
| |
| ctrl = amp_ctrl_add(mgr, rsp->id); |
| if (!ctrl) |
| return -ENOMEM; |
| |
| req.id = rsp->id; |
| a2mp_send(mgr, A2MP_GETAMPASSOC_REQ, __next_ident(mgr), sizeof(req), |
| &req); |
| |
| skb_pull(skb, sizeof(*rsp)); |
| return 0; |
| } |
| |
| static int a2mp_getampassoc_req(struct amp_mgr *mgr, struct sk_buff *skb, |
| struct a2mp_cmd *hdr) |
| { |
| struct a2mp_amp_assoc_req *req = (void *) skb->data; |
| struct hci_dev *hdev; |
| struct amp_mgr *tmp; |
| |
| if (le16_to_cpu(hdr->len) < sizeof(*req)) |
| return -EINVAL; |
| |
| BT_DBG("id %d", req->id); |
| |
| /* Make sure that other request is not processed */ |
| tmp = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC); |
| |
| hdev = hci_dev_get(req->id); |
| if (!hdev || hdev->amp_type == AMP_TYPE_BREDR || tmp) { |
| struct a2mp_amp_assoc_rsp rsp; |
| rsp.id = req->id; |
| |
| if (tmp) { |
| rsp.status = A2MP_STATUS_COLLISION_OCCURED; |
| amp_mgr_put(tmp); |
| } else { |
| rsp.status = A2MP_STATUS_INVALID_CTRL_ID; |
| } |
| |
| a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, hdr->ident, sizeof(rsp), |
| &rsp); |
| |
| goto done; |
| } |
| |
| amp_read_loc_assoc(hdev, mgr); |
| |
| done: |
| if (hdev) |
| hci_dev_put(hdev); |
| |
| skb_pull(skb, sizeof(*req)); |
| return 0; |
| } |
| |
| static int a2mp_getampassoc_rsp(struct amp_mgr *mgr, struct sk_buff *skb, |
| struct a2mp_cmd *hdr) |
| { |
| struct a2mp_amp_assoc_rsp *rsp = (void *) skb->data; |
| u16 len = le16_to_cpu(hdr->len); |
| struct hci_dev *hdev; |
| struct amp_ctrl *ctrl; |
| struct hci_conn *hcon; |
| size_t assoc_len; |
| |
| if (len < sizeof(*rsp)) |
| return -EINVAL; |
| |
| assoc_len = len - sizeof(*rsp); |
| |
| BT_DBG("id %d status 0x%2.2x assoc len %zu", rsp->id, rsp->status, |
| assoc_len); |
| |
| if (rsp->status) |
| return -EINVAL; |
| |
| /* Save remote ASSOC data */ |
| ctrl = amp_ctrl_lookup(mgr, rsp->id); |
| if (ctrl) { |
| u8 *assoc; |
| |
| assoc = kmemdup(rsp->amp_assoc, assoc_len, GFP_KERNEL); |
| if (!assoc) { |
| amp_ctrl_put(ctrl); |
| return -ENOMEM; |
| } |
| |
| ctrl->assoc = assoc; |
| ctrl->assoc_len = assoc_len; |
| ctrl->assoc_rem_len = assoc_len; |
| ctrl->assoc_len_so_far = 0; |
| |
| amp_ctrl_put(ctrl); |
| } |
| |
| /* Create Phys Link */ |
| hdev = hci_dev_get(rsp->id); |
| if (!hdev) |
| return -EINVAL; |
| |
| hcon = phylink_add(hdev, mgr, rsp->id, true); |
| if (!hcon) |
| goto done; |
| |
| BT_DBG("Created hcon %p: loc:%d -> rem:%d", hcon, hdev->id, rsp->id); |
| |
| mgr->bredr_chan->remote_amp_id = rsp->id; |
| |
| amp_create_phylink(hdev, mgr, hcon); |
| |
| done: |
| hci_dev_put(hdev); |
| skb_pull(skb, len); |
| return 0; |
| } |
| |
| static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb, |
| struct a2mp_cmd *hdr) |
| { |
| struct a2mp_physlink_req *req = (void *) skb->data; |
| |
| struct a2mp_physlink_rsp rsp; |
| struct hci_dev *hdev; |
| struct hci_conn *hcon; |
| struct amp_ctrl *ctrl; |
| |
| if (le16_to_cpu(hdr->len) < sizeof(*req)) |
| return -EINVAL; |
| |
| BT_DBG("local_id %d, remote_id %d", req->local_id, req->remote_id); |
| |
| rsp.local_id = req->remote_id; |
| rsp.remote_id = req->local_id; |
| |
| hdev = hci_dev_get(req->remote_id); |
| if (!hdev || hdev->amp_type == AMP_TYPE_BREDR) { |
| rsp.status = A2MP_STATUS_INVALID_CTRL_ID; |
| goto send_rsp; |
| } |
| |
| ctrl = amp_ctrl_lookup(mgr, rsp.remote_id); |
| if (!ctrl) { |
| ctrl = amp_ctrl_add(mgr, rsp.remote_id); |
| if (ctrl) { |
| amp_ctrl_get(ctrl); |
| } else { |
| rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION; |
| goto send_rsp; |
| } |
| } |
| |
| if (ctrl) { |
| size_t assoc_len = le16_to_cpu(hdr->len) - sizeof(*req); |
| u8 *assoc; |
| |
| assoc = kmemdup(req->amp_assoc, assoc_len, GFP_KERNEL); |
| if (!assoc) { |
| amp_ctrl_put(ctrl); |
| return -ENOMEM; |
| } |
| |
| ctrl->assoc = assoc; |
| ctrl->assoc_len = assoc_len; |
| ctrl->assoc_rem_len = assoc_len; |
| ctrl->assoc_len_so_far = 0; |
| |
| amp_ctrl_put(ctrl); |
| } |
| |
| hcon = phylink_add(hdev, mgr, req->local_id, false); |
| if (hcon) { |
| amp_accept_phylink(hdev, mgr, hcon); |
| rsp.status = A2MP_STATUS_SUCCESS; |
| } else { |
| rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION; |
| } |
| |
| send_rsp: |
| if (hdev) |
| hci_dev_put(hdev); |
| |
| /* Reply error now and success after HCI Write Remote AMP Assoc |
| command complete with success status |
| */ |
| if (rsp.status != A2MP_STATUS_SUCCESS) { |
| a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, hdr->ident, |
| sizeof(rsp), &rsp); |
| } else { |
| set_bit(WRITE_REMOTE_AMP_ASSOC, &mgr->state); |
| mgr->ident = hdr->ident; |
| } |
| |
| skb_pull(skb, le16_to_cpu(hdr->len)); |
| return 0; |
| } |
| |
| static int a2mp_discphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb, |
| struct a2mp_cmd *hdr) |
| { |
| struct a2mp_physlink_req *req = (void *) skb->data; |
| struct a2mp_physlink_rsp rsp; |
| struct hci_dev *hdev; |
| struct hci_conn *hcon; |
| |
| if (le16_to_cpu(hdr->len) < sizeof(*req)) |
| return -EINVAL; |
| |
| BT_DBG("local_id %d remote_id %d", req->local_id, req->remote_id); |
| |
| rsp.local_id = req->remote_id; |
| rsp.remote_id = req->local_id; |
| rsp.status = A2MP_STATUS_SUCCESS; |
| |
| hdev = hci_dev_get(req->remote_id); |
| if (!hdev) { |
| rsp.status = A2MP_STATUS_INVALID_CTRL_ID; |
| goto send_rsp; |
| } |
| |
| hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, |
| &mgr->l2cap_conn->hcon->dst); |
| if (!hcon) { |
| BT_ERR("No phys link exist"); |
| rsp.status = A2MP_STATUS_NO_PHYSICAL_LINK_EXISTS; |
| goto clean; |
| } |
| |
| /* TODO Disconnect Phys Link here */ |
| |
| clean: |
| hci_dev_put(hdev); |
| |
| send_rsp: |
| a2mp_send(mgr, A2MP_DISCONNPHYSLINK_RSP, hdr->ident, sizeof(rsp), &rsp); |
| |
| skb_pull(skb, sizeof(*req)); |
| return 0; |
| } |
| |
| static inline int a2mp_cmd_rsp(struct amp_mgr *mgr, struct sk_buff *skb, |
| struct a2mp_cmd *hdr) |
| { |
| BT_DBG("ident %d code 0x%2.2x", hdr->ident, hdr->code); |
| |
| skb_pull(skb, le16_to_cpu(hdr->len)); |
| return 0; |
| } |
| |
| /* Handle A2MP signalling */ |
| static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
| { |
| struct a2mp_cmd *hdr; |
| struct amp_mgr *mgr = chan->data; |
| int err = 0; |
| |
| amp_mgr_get(mgr); |
| |
| while (skb->len >= sizeof(*hdr)) { |
| u16 len; |
| |
| hdr = (void *) skb->data; |
| len = le16_to_cpu(hdr->len); |
| |
| BT_DBG("code 0x%2.2x id %d len %u", hdr->code, hdr->ident, len); |
| |
| skb_pull(skb, sizeof(*hdr)); |
| |
| if (len > skb->len || !hdr->ident) { |
| err = -EINVAL; |
| break; |
| } |
| |
| mgr->ident = hdr->ident; |
| |
| switch (hdr->code) { |
| case A2MP_COMMAND_REJ: |
| a2mp_command_rej(mgr, skb, hdr); |
| break; |
| |
| case A2MP_DISCOVER_REQ: |
| err = a2mp_discover_req(mgr, skb, hdr); |
| break; |
| |
| case A2MP_CHANGE_NOTIFY: |
| err = a2mp_change_notify(mgr, skb, hdr); |
| break; |
| |
| case A2MP_GETINFO_REQ: |
| err = a2mp_getinfo_req(mgr, skb, hdr); |
| break; |
| |
| case A2MP_GETAMPASSOC_REQ: |
| err = a2mp_getampassoc_req(mgr, skb, hdr); |
| break; |
| |
| case A2MP_CREATEPHYSLINK_REQ: |
| err = a2mp_createphyslink_req(mgr, skb, hdr); |
| break; |
| |
| case A2MP_DISCONNPHYSLINK_REQ: |
| err = a2mp_discphyslink_req(mgr, skb, hdr); |
| break; |
| |
| case A2MP_DISCOVER_RSP: |
| err = a2mp_discover_rsp(mgr, skb, hdr); |
| break; |
| |
| case A2MP_GETINFO_RSP: |
| err = a2mp_getinfo_rsp(mgr, skb, hdr); |
| break; |
| |
| case A2MP_GETAMPASSOC_RSP: |
| err = a2mp_getampassoc_rsp(mgr, skb, hdr); |
| break; |
| |
| case A2MP_CHANGE_RSP: |
| case A2MP_CREATEPHYSLINK_RSP: |
| case A2MP_DISCONNPHYSLINK_RSP: |
| err = a2mp_cmd_rsp(mgr, skb, hdr); |
| break; |
| |
| default: |
| BT_ERR("Unknown A2MP sig cmd 0x%2.2x", hdr->code); |
| err = -EINVAL; |
| break; |
| } |
| } |
| |
| if (err) { |
| struct a2mp_cmd_rej rej; |
| |
| rej.reason = cpu_to_le16(0); |
| hdr = (void *) skb->data; |
| |
| BT_DBG("Send A2MP Rej: cmd 0x%2.2x err %d", hdr->code, err); |
| |
| a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej), |
| &rej); |
| } |
| |
| /* Always free skb and return success error code to prevent |
| from sending L2CAP Disconnect over A2MP channel */ |
| kfree_skb(skb); |
| |
| amp_mgr_put(mgr); |
| |
| return 0; |
| } |
| |
| static void a2mp_chan_close_cb(struct l2cap_chan *chan) |
| { |
| l2cap_chan_put(chan); |
| } |
| |
| static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state, |
| int err) |
| { |
| struct amp_mgr *mgr = chan->data; |
| |
| if (!mgr) |
| return; |
| |
| BT_DBG("chan %p state %s", chan, state_to_string(state)); |
| |
| chan->state = state; |
| |
| switch (state) { |
| case BT_CLOSED: |
| if (mgr) |
| amp_mgr_put(mgr); |
| break; |
| } |
| } |
| |
| static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan, |
| unsigned long hdr_len, |
| unsigned long len, int nb) |
| { |
| struct sk_buff *skb; |
| |
| skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL); |
| if (!skb) |
| return ERR_PTR(-ENOMEM); |
| |
| return skb; |
| } |
| |
| static const struct l2cap_ops a2mp_chan_ops = { |
| .name = "L2CAP A2MP channel", |
| .recv = a2mp_chan_recv_cb, |
| .close = a2mp_chan_close_cb, |
| .state_change = a2mp_chan_state_change_cb, |
| .alloc_skb = a2mp_chan_alloc_skb_cb, |
| |
| /* Not implemented for A2MP */ |
| .new_connection = l2cap_chan_no_new_connection, |
| .teardown = l2cap_chan_no_teardown, |
| .ready = l2cap_chan_no_ready, |
| .defer = l2cap_chan_no_defer, |
| .resume = l2cap_chan_no_resume, |
| .set_shutdown = l2cap_chan_no_set_shutdown, |
| .get_sndtimeo = l2cap_chan_no_get_sndtimeo, |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3,19,0) |
| .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec, |
| #endif |
| }; |
| |
| static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn, bool locked) |
| { |
| struct l2cap_chan *chan; |
| int err; |
| |
| chan = l2cap_chan_create(); |
| if (!chan) |
| return NULL; |
| |
| BT_DBG("chan %p", chan); |
| |
| chan->chan_type = L2CAP_CHAN_FIXED; |
| chan->scid = L2CAP_CID_A2MP; |
| chan->dcid = L2CAP_CID_A2MP; |
| chan->omtu = L2CAP_A2MP_DEFAULT_MTU; |
| chan->imtu = L2CAP_A2MP_DEFAULT_MTU; |
| chan->flush_to = L2CAP_DEFAULT_FLUSH_TO; |
| |
| chan->ops = &a2mp_chan_ops; |
| |
| l2cap_chan_set_defaults(chan); |
| chan->remote_max_tx = chan->max_tx; |
| chan->remote_tx_win = chan->tx_win; |
| |
| chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO; |
| chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO; |
| |
| skb_queue_head_init(&chan->tx_q); |
| |
| chan->mode = L2CAP_MODE_ERTM; |
| |
| err = l2cap_ertm_init(chan); |
| if (err < 0) { |
| l2cap_chan_del(chan, 0); |
| return NULL; |
| } |
| |
| chan->conf_state = 0; |
| |
| if (locked) |
| __l2cap_chan_add(conn, chan); |
| else |
| l2cap_chan_add(conn, chan); |
| |
| chan->remote_mps = chan->omtu; |
| chan->mps = chan->omtu; |
| |
| chan->state = BT_CONNECTED; |
| |
| return chan; |
| } |
| |
| /* AMP Manager functions */ |
| struct amp_mgr *amp_mgr_get(struct amp_mgr *mgr) |
| { |
| BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount)); |
| |
| kref_get(&mgr->kref); |
| |
| return mgr; |
| } |
| |
| static void amp_mgr_destroy(struct kref *kref) |
| { |
| struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref); |
| |
| BT_DBG("mgr %p", mgr); |
| |
| mutex_lock(&_mgr_list_lock); |
| list_del(&mgr->list); |
| mutex_unlock(&_mgr_list_lock); |
| |
| amp_ctrl_list_flush(mgr); |
| kfree(mgr); |
| } |
| |
| int amp_mgr_put(struct amp_mgr *mgr) |
| { |
| BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount)); |
| |
| return kref_put(&mgr->kref, &_mgr_destroy); |
| } |
| |
| static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn, bool locked) |
| { |
| struct amp_mgr *mgr; |
| struct l2cap_chan *chan; |
| |
| mgr = kzalloc(sizeof(*mgr), GFP_KERNEL); |
| if (!mgr) |
| return NULL; |
| |
| BT_DBG("conn %p mgr %p", conn, mgr); |
| |
| mgr->l2cap_conn = conn; |
| |
| chan = a2mp_chan_open(conn, locked); |
| if (!chan) { |
| kfree(mgr); |
| return NULL; |
| } |
| |
| mgr->a2mp_chan = chan; |
| chan->data = mgr; |
| |
| conn->hcon->amp_mgr = mgr; |
| |
| kref_init(&mgr->kref); |
| |
| /* Remote AMP ctrl list initialization */ |
| INIT_LIST_HEAD(&mgr->amp_ctrls); |
| mutex_init(&mgr->amp_ctrls_lock); |
| |
| mutex_lock(&_mgr_list_lock); |
| list_add(&mgr->list, &_mgr_list); |
| mutex_unlock(&_mgr_list_lock); |
| |
| return mgr; |
| } |
| |
| struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn, |
| struct sk_buff *skb) |
| { |
| struct amp_mgr *mgr; |
| |
| if (conn->hcon->type != ACL_LINK) |
| return NULL; |
| |
| mgr = amp_mgr_create(conn, false); |
| if (!mgr) { |
| BT_ERR("Could not create AMP manager"); |
| return NULL; |
| } |
| |
| BT_DBG("mgr: %p chan %p", mgr, mgr->a2mp_chan); |
| |
| return mgr->a2mp_chan; |
| } |
| |
| void a2mp_send_getinfo_rsp(struct hci_dev *hdev) |
| { |
| struct amp_mgr *mgr; |
| struct a2mp_info_rsp rsp; |
| |
| mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_INFO); |
| if (!mgr) |
| return; |
| |
| BT_DBG("%s mgr %p", hdev->name, mgr); |
| |
| rsp.id = hdev->id; |
| rsp.status = A2MP_STATUS_INVALID_CTRL_ID; |
| |
| if (hdev->amp_type != AMP_TYPE_BREDR) { |
| rsp.status = 0; |
| rsp.total_bw = cpu_to_le32(hdev->amp_total_bw); |
| rsp.max_bw = cpu_to_le32(hdev->amp_max_bw); |
| rsp.min_latency = cpu_to_le32(hdev->amp_min_latency); |
| rsp.pal_cap = cpu_to_le16(hdev->amp_pal_cap); |
| rsp.assoc_size = cpu_to_le16(hdev->amp_assoc_size); |
| } |
| |
| a2mp_send(mgr, A2MP_GETINFO_RSP, mgr->ident, sizeof(rsp), &rsp); |
| amp_mgr_put(mgr); |
| } |
| |
| void a2mp_send_getampassoc_rsp(struct hci_dev *hdev, u8 status) |
| { |
| struct amp_mgr *mgr; |
| struct amp_assoc *loc_assoc = &hdev->loc_assoc; |
| struct a2mp_amp_assoc_rsp *rsp; |
| size_t len; |
| |
| mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC); |
| if (!mgr) |
| return; |
| |
| BT_DBG("%s mgr %p", hdev->name, mgr); |
| |
| len = sizeof(struct a2mp_amp_assoc_rsp) + loc_assoc->len; |
| rsp = kzalloc(len, GFP_KERNEL); |
| if (!rsp) { |
| amp_mgr_put(mgr); |
| return; |
| } |
| |
| rsp->id = hdev->id; |
| |
| if (status) { |
| rsp->status = A2MP_STATUS_INVALID_CTRL_ID; |
| } else { |
| rsp->status = A2MP_STATUS_SUCCESS; |
| memcpy(rsp->amp_assoc, loc_assoc->data, loc_assoc->len); |
| } |
| |
| a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, mgr->ident, len, rsp); |
| amp_mgr_put(mgr); |
| kfree(rsp); |
| } |
| |
| void a2mp_send_create_phy_link_req(struct hci_dev *hdev, u8 status) |
| { |
| struct amp_mgr *mgr; |
| struct amp_assoc *loc_assoc = &hdev->loc_assoc; |
| struct a2mp_physlink_req *req; |
| struct l2cap_chan *bredr_chan; |
| size_t len; |
| |
| mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC_FINAL); |
| if (!mgr) |
| return; |
| |
| len = sizeof(*req) + loc_assoc->len; |
| |
| BT_DBG("%s mgr %p assoc_len %zu", hdev->name, mgr, len); |
| |
| req = kzalloc(len, GFP_KERNEL); |
| if (!req) { |
| amp_mgr_put(mgr); |
| return; |
| } |
| |
| bredr_chan = mgr->bredr_chan; |
| if (!bredr_chan) |
| goto clean; |
| |
| req->local_id = hdev->id; |
| req->remote_id = bredr_chan->remote_amp_id; |
| memcpy(req->amp_assoc, loc_assoc->data, loc_assoc->len); |
| |
| a2mp_send(mgr, A2MP_CREATEPHYSLINK_REQ, __next_ident(mgr), len, req); |
| |
| clean: |
| amp_mgr_put(mgr); |
| kfree(req); |
| } |
| |
| void a2mp_send_create_phy_link_rsp(struct hci_dev *hdev, u8 status) |
| { |
| struct amp_mgr *mgr; |
| struct a2mp_physlink_rsp rsp; |
| struct hci_conn *hs_hcon; |
| |
| mgr = amp_mgr_lookup_by_state(WRITE_REMOTE_AMP_ASSOC); |
| if (!mgr) |
| return; |
| |
| hs_hcon = hci_conn_hash_lookup_state(hdev, AMP_LINK, BT_CONNECT); |
| if (!hs_hcon) { |
| rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION; |
| } else { |
| rsp.remote_id = hs_hcon->remote_id; |
| rsp.status = A2MP_STATUS_SUCCESS; |
| } |
| |
| BT_DBG("%s mgr %p hs_hcon %p status %u", hdev->name, mgr, hs_hcon, |
| status); |
| |
| rsp.local_id = hdev->id; |
| a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, mgr->ident, sizeof(rsp), &rsp); |
| amp_mgr_put(mgr); |
| } |
| |
| void a2mp_discover_amp(struct l2cap_chan *chan) |
| { |
| struct l2cap_conn *conn = chan->conn; |
| struct amp_mgr *mgr = conn->hcon->amp_mgr; |
| struct a2mp_discov_req req; |
| |
| BT_DBG("chan %p conn %p mgr %p", chan, conn, mgr); |
| |
| if (!mgr) { |
| mgr = amp_mgr_create(conn, true); |
| if (!mgr) |
| return; |
| } |
| |
| mgr->bredr_chan = chan; |
| |
| req.mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU); |
| req.ext_feat = 0; |
| a2mp_send(mgr, A2MP_DISCOVER_REQ, 1, sizeof(req), &req); |
| } |