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466f8004 AE |
1 | /* |
2 | Copyright (c) 2010,2011 Code Aurora Forum. All rights reserved. | |
3 | Copyright (c) 2011,2012 Intel Corp. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License version 2 and | |
7 | only version 2 as published by the Free Software Foundation. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | */ | |
14 | ||
15 | #include <net/bluetooth/bluetooth.h> | |
16 | #include <net/bluetooth/hci_core.h> | |
17 | #include <net/bluetooth/l2cap.h> | |
9740e49d | 18 | #include <net/bluetooth/a2mp.h> |
466f8004 | 19 | |
f6d3c6e7 AE |
20 | /* A2MP build & send command helper functions */ |
21 | static struct a2mp_cmd *__a2mp_build(u8 code, u8 ident, u16 len, void *data) | |
22 | { | |
23 | struct a2mp_cmd *cmd; | |
24 | int plen; | |
25 | ||
26 | plen = sizeof(*cmd) + len; | |
27 | cmd = kzalloc(plen, GFP_KERNEL); | |
28 | if (!cmd) | |
29 | return NULL; | |
30 | ||
31 | cmd->code = code; | |
32 | cmd->ident = ident; | |
33 | cmd->len = cpu_to_le16(len); | |
34 | ||
35 | memcpy(cmd->data, data, len); | |
36 | ||
37 | return cmd; | |
38 | } | |
39 | ||
40 | static void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len, | |
41 | void *data) | |
42 | { | |
43 | struct l2cap_chan *chan = mgr->a2mp_chan; | |
44 | struct a2mp_cmd *cmd; | |
45 | u16 total_len = len + sizeof(*cmd); | |
46 | struct kvec iv; | |
47 | struct msghdr msg; | |
48 | ||
49 | cmd = __a2mp_build(code, ident, len, data); | |
50 | if (!cmd) | |
51 | return; | |
52 | ||
53 | iv.iov_base = cmd; | |
54 | iv.iov_len = total_len; | |
55 | ||
56 | memset(&msg, 0, sizeof(msg)); | |
57 | ||
58 | msg.msg_iov = (struct iovec *) &iv; | |
59 | msg.msg_iovlen = 1; | |
60 | ||
61 | l2cap_chan_send(chan, &msg, total_len, 0); | |
62 | ||
63 | kfree(cmd); | |
64 | } | |
65 | ||
6b44d9b8 AE |
66 | /* Handle A2MP signalling */ |
67 | static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) | |
68 | { | |
69 | struct a2mp_cmd *hdr = (void *) skb->data; | |
70 | struct amp_mgr *mgr = chan->data; | |
71 | int err = 0; | |
72 | ||
73 | amp_mgr_get(mgr); | |
74 | ||
75 | while (skb->len >= sizeof(*hdr)) { | |
76 | struct a2mp_cmd *hdr = (void *) skb->data; | |
77 | u16 len = le16_to_cpu(hdr->len); | |
78 | ||
79 | BT_DBG("code 0x%02x id %d len %d", hdr->code, hdr->ident, len); | |
80 | ||
81 | skb_pull(skb, sizeof(*hdr)); | |
82 | ||
83 | if (len > skb->len || !hdr->ident) { | |
84 | err = -EINVAL; | |
85 | break; | |
86 | } | |
87 | ||
88 | mgr->ident = hdr->ident; | |
89 | ||
90 | switch (hdr->code) { | |
91 | case A2MP_COMMAND_REJ: | |
92 | case A2MP_DISCOVER_REQ: | |
93 | case A2MP_CHANGE_NOTIFY: | |
94 | case A2MP_GETINFO_REQ: | |
95 | case A2MP_GETAMPASSOC_REQ: | |
96 | case A2MP_CREATEPHYSLINK_REQ: | |
97 | case A2MP_DISCONNPHYSLINK_REQ: | |
98 | case A2MP_CHANGE_RSP: | |
99 | case A2MP_DISCOVER_RSP: | |
100 | case A2MP_GETINFO_RSP: | |
101 | case A2MP_GETAMPASSOC_RSP: | |
102 | case A2MP_CREATEPHYSLINK_RSP: | |
103 | case A2MP_DISCONNPHYSLINK_RSP: | |
104 | default: | |
105 | BT_ERR("Unknown A2MP sig cmd 0x%2.2x", hdr->code); | |
106 | err = -EINVAL; | |
107 | break; | |
108 | } | |
109 | } | |
110 | ||
111 | if (err) { | |
112 | struct a2mp_cmd_rej rej; | |
113 | rej.reason = __constant_cpu_to_le16(0); | |
114 | ||
115 | BT_DBG("Send A2MP Rej: cmd 0x%2.2x err %d", hdr->code, err); | |
116 | ||
117 | a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej), | |
118 | &rej); | |
119 | } | |
120 | ||
121 | /* Always free skb and return success error code to prevent | |
122 | from sending L2CAP Disconnect over A2MP channel */ | |
123 | kfree_skb(skb); | |
124 | ||
125 | amp_mgr_put(mgr); | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
46d5c908 AE |
130 | static void a2mp_chan_close_cb(struct l2cap_chan *chan) |
131 | { | |
132 | l2cap_chan_destroy(chan); | |
133 | } | |
134 | ||
135 | static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state) | |
136 | { | |
137 | struct amp_mgr *mgr = chan->data; | |
138 | ||
139 | if (!mgr) | |
140 | return; | |
141 | ||
142 | BT_DBG("chan %p state %s", chan, state_to_string(state)); | |
143 | ||
144 | chan->state = state; | |
145 | ||
146 | switch (state) { | |
147 | case BT_CLOSED: | |
148 | if (mgr) | |
149 | amp_mgr_put(mgr); | |
150 | break; | |
151 | } | |
152 | } | |
153 | ||
154 | static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan, | |
155 | unsigned long len, int nb) | |
156 | { | |
157 | return bt_skb_alloc(len, GFP_KERNEL); | |
158 | } | |
159 | ||
160 | static struct l2cap_chan *a2mp_chan_no_new_conn_cb(struct l2cap_chan *chan) | |
161 | { | |
162 | BT_ERR("new_connection for chan %p not implemented", chan); | |
163 | ||
164 | return NULL; | |
165 | } | |
166 | ||
167 | static void a2mp_chan_no_teardown_cb(struct l2cap_chan *chan, int err) | |
168 | { | |
169 | BT_ERR("teardown for chan %p not implemented", chan); | |
170 | } | |
171 | ||
172 | static void a2mp_chan_no_ready(struct l2cap_chan *chan) | |
173 | { | |
174 | BT_ERR("ready for chan %p not implemented", chan); | |
175 | } | |
176 | ||
466f8004 AE |
177 | static struct l2cap_ops a2mp_chan_ops = { |
178 | .name = "L2CAP A2MP channel", | |
6b44d9b8 | 179 | .recv = a2mp_chan_recv_cb, |
46d5c908 AE |
180 | .close = a2mp_chan_close_cb, |
181 | .state_change = a2mp_chan_state_change_cb, | |
182 | .alloc_skb = a2mp_chan_alloc_skb_cb, | |
183 | ||
184 | /* Not implemented for A2MP */ | |
185 | .new_connection = a2mp_chan_no_new_conn_cb, | |
186 | .teardown = a2mp_chan_no_teardown_cb, | |
187 | .ready = a2mp_chan_no_ready, | |
466f8004 AE |
188 | }; |
189 | ||
190 | static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn) | |
191 | { | |
192 | struct l2cap_chan *chan; | |
193 | int err; | |
194 | ||
195 | chan = l2cap_chan_create(); | |
196 | if (!chan) | |
197 | return NULL; | |
198 | ||
199 | BT_DBG("chan %p", chan); | |
200 | ||
201 | hci_conn_hold(conn->hcon); | |
202 | ||
203 | chan->omtu = L2CAP_A2MP_DEFAULT_MTU; | |
204 | chan->imtu = L2CAP_A2MP_DEFAULT_MTU; | |
205 | chan->flush_to = L2CAP_DEFAULT_FLUSH_TO; | |
206 | ||
207 | chan->ops = &a2mp_chan_ops; | |
208 | ||
209 | l2cap_chan_set_defaults(chan); | |
210 | chan->remote_max_tx = chan->max_tx; | |
211 | chan->remote_tx_win = chan->tx_win; | |
212 | ||
213 | chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO; | |
214 | chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO; | |
215 | ||
216 | skb_queue_head_init(&chan->tx_q); | |
217 | ||
218 | chan->mode = L2CAP_MODE_ERTM; | |
219 | ||
220 | err = l2cap_ertm_init(chan); | |
221 | if (err < 0) { | |
222 | l2cap_chan_del(chan, 0); | |
223 | return NULL; | |
224 | } | |
225 | ||
226 | chan->conf_state = 0; | |
227 | ||
228 | l2cap_chan_add(conn, chan); | |
229 | ||
230 | chan->remote_mps = chan->omtu; | |
231 | chan->mps = chan->omtu; | |
232 | ||
233 | chan->state = BT_CONNECTED; | |
234 | ||
235 | return chan; | |
236 | } | |
9740e49d AE |
237 | |
238 | /* AMP Manager functions */ | |
239 | void amp_mgr_get(struct amp_mgr *mgr) | |
240 | { | |
241 | BT_DBG("mgr %p", mgr); | |
242 | ||
243 | kref_get(&mgr->kref); | |
244 | } | |
245 | ||
246 | static void amp_mgr_destroy(struct kref *kref) | |
247 | { | |
248 | struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref); | |
249 | ||
250 | BT_DBG("mgr %p", mgr); | |
251 | ||
252 | kfree(mgr); | |
253 | } | |
254 | ||
255 | int amp_mgr_put(struct amp_mgr *mgr) | |
256 | { | |
257 | BT_DBG("mgr %p", mgr); | |
258 | ||
259 | return kref_put(&mgr->kref, &_mgr_destroy); | |
260 | } | |
261 | ||
262 | static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn) | |
263 | { | |
264 | struct amp_mgr *mgr; | |
265 | struct l2cap_chan *chan; | |
266 | ||
267 | mgr = kzalloc(sizeof(*mgr), GFP_KERNEL); | |
268 | if (!mgr) | |
269 | return NULL; | |
270 | ||
271 | BT_DBG("conn %p mgr %p", conn, mgr); | |
272 | ||
273 | mgr->l2cap_conn = conn; | |
274 | ||
275 | chan = a2mp_chan_open(conn); | |
276 | if (!chan) { | |
277 | kfree(mgr); | |
278 | return NULL; | |
279 | } | |
280 | ||
281 | mgr->a2mp_chan = chan; | |
282 | chan->data = mgr; | |
283 | ||
284 | conn->hcon->amp_mgr = mgr; | |
285 | ||
286 | kref_init(&mgr->kref); | |
287 | ||
288 | return mgr; | |
289 | } |