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/*
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 <net/bluetooth/a2mp.h>
/* 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));
msg.msg_iov = (struct iovec *) &iv;
msg.msg_iovlen = 1;
l2cap_chan_send(chan, &msg, total_len, 0);
kfree(cmd);
}
static inline void __a2mp_cl_bredr(struct a2mp_cl *cl)
{
cl->id = 0;
cl->type = 0;
cl->status = 1;
}
/* hci_dev_list shall be locked */
static void __a2mp_add_cl(struct amp_mgr *mgr, struct a2mp_cl *cl, u8 num_ctrl)
{
int i = 0;
struct hci_dev *hdev;
__a2mp_cl_bredr(cl);
list_for_each_entry(hdev, &hci_dev_list, list) {
/* Iterate through AMP controllers */
if (hdev->id == HCI_BREDR_ID)
continue;
/* Starting from second entry */
if (++i >= num_ctrl)
return;
cl[i].id = hdev->id;
cl[i].type = hdev->amp_type;
cl[i].status = hdev->amp_status;
}
}
/* 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;
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);
num_ctrl = __hci_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 = __constant_cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
rsp->ext_feat = 0;
__a2mp_add_cl(mgr, rsp->cl, num_ctrl);
read_unlock(&hci_dev_list_lock);
a2mp_send(mgr, A2MP_DISCOVER_RSP, hdr->ident, len, rsp);
kfree(rsp);
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 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 a2mp_info_rsp rsp;
struct hci_dev *hdev;
if (le16_to_cpu(hdr->len) < sizeof(*req))
return -EINVAL;
BT_DBG("id %d", req->id);
rsp.id = req->id;
rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
hdev = hci_dev_get(req->id);
if (hdev && hdev->amp_type != HCI_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);
}
if (hdev)
hci_dev_put(hdev);
a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp), &rsp);
skb_pull(skb, sizeof(*req));
return 0;
}
static
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