Commit | Line | Data |
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eb492e01 AB |
1 | /* |
2 | BlueZ - Bluetooth protocol stack for Linux | |
3 | Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | |
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 as | |
7 | published by the Free Software Foundation; | |
8 | ||
9 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
10 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
11 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
12 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
13 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES | |
14 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
15 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
16 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
17 | ||
18 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, | |
19 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
20 | SOFTWARE IS DISCLAIMED. | |
21 | */ | |
22 | ||
23 | #include <net/bluetooth/bluetooth.h> | |
24 | #include <net/bluetooth/hci_core.h> | |
25 | #include <net/bluetooth/l2cap.h> | |
26 | #include <net/bluetooth/smp.h> | |
27 | ||
28 | static struct sk_buff *smp_build_cmd(struct l2cap_conn *conn, u8 code, | |
29 | u16 dlen, void *data) | |
30 | { | |
31 | struct sk_buff *skb; | |
32 | struct l2cap_hdr *lh; | |
33 | int len; | |
34 | ||
35 | len = L2CAP_HDR_SIZE + sizeof(code) + dlen; | |
36 | ||
37 | if (len > conn->mtu) | |
38 | return NULL; | |
39 | ||
40 | skb = bt_skb_alloc(len, GFP_ATOMIC); | |
41 | if (!skb) | |
42 | return NULL; | |
43 | ||
44 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
45 | lh->len = cpu_to_le16(sizeof(code) + dlen); | |
46 | lh->cid = cpu_to_le16(L2CAP_CID_SMP); | |
47 | ||
48 | memcpy(skb_put(skb, sizeof(code)), &code, sizeof(code)); | |
49 | ||
50 | memcpy(skb_put(skb, dlen), data, dlen); | |
51 | ||
52 | return skb; | |
53 | } | |
54 | ||
55 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) | |
56 | { | |
57 | struct sk_buff *skb = smp_build_cmd(conn, code, len, data); | |
58 | ||
59 | BT_DBG("code 0x%2.2x", code); | |
60 | ||
61 | if (!skb) | |
62 | return; | |
63 | ||
64 | hci_send_acl(conn->hcon, skb, 0); | |
65 | } | |
66 | ||
88ba43b6 AB |
67 | static void smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
68 | { | |
69 | struct smp_cmd_pairing *rp = (void *) skb->data; | |
70 | ||
71 | BT_DBG("conn %p", conn); | |
72 | ||
73 | skb_pull(skb, sizeof(*rp)); | |
74 | ||
75 | rp->io_capability = 0x00; | |
76 | rp->oob_flag = 0x00; | |
77 | rp->max_key_size = 16; | |
78 | rp->init_key_dist = 0x00; | |
79 | rp->resp_key_dist = 0x00; | |
80 | rp->auth_req &= (SMP_AUTH_BONDING | SMP_AUTH_MITM); | |
81 | ||
82 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(*rp), rp); | |
83 | } | |
84 | ||
85 | static void smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) | |
86 | { | |
87 | struct smp_cmd_pairing_confirm cp; | |
88 | ||
89 | BT_DBG("conn %p", conn); | |
90 | ||
91 | memset(&cp, 0, sizeof(cp)); | |
92 | ||
93 | smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); | |
94 | } | |
95 | ||
96 | static void smp_cmd_pairing_confirm(struct l2cap_conn *conn, | |
97 | struct sk_buff *skb) | |
98 | { | |
99 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
100 | ||
101 | if (conn->hcon->out) { | |
102 | struct smp_cmd_pairing_random random; | |
103 | ||
104 | memset(&random, 0, sizeof(random)); | |
105 | ||
106 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(random), | |
107 | &random); | |
108 | } else { | |
109 | struct smp_cmd_pairing_confirm confirm; | |
110 | ||
111 | memset(&confirm, 0, sizeof(confirm)); | |
112 | ||
113 | smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(confirm), | |
114 | &confirm); | |
115 | } | |
116 | } | |
117 | ||
118 | static void smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) | |
119 | { | |
120 | struct smp_cmd_pairing_random cp; | |
121 | ||
122 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
123 | ||
124 | skb_pull(skb, sizeof(cp)); | |
125 | ||
126 | if (conn->hcon->out) { | |
127 | /* FIXME: start encryption */ | |
128 | } else { | |
129 | memset(&cp, 0, sizeof(cp)); | |
130 | ||
131 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(cp), &cp); | |
132 | } | |
133 | } | |
134 | ||
135 | static void smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) | |
136 | { | |
137 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
138 | struct smp_cmd_pairing cp; | |
139 | ||
140 | BT_DBG("conn %p", conn); | |
141 | ||
142 | skb_pull(skb, sizeof(*rp)); | |
143 | memset(&cp, 0, sizeof(cp)); | |
144 | ||
145 | cp.io_capability = 0x00; | |
146 | cp.oob_flag = 0x00; | |
147 | cp.max_key_size = 16; | |
148 | cp.init_key_dist = 0x00; | |
149 | cp.resp_key_dist = 0x00; | |
150 | cp.auth_req = rp->auth_req & (SMP_AUTH_BONDING | SMP_AUTH_MITM); | |
151 | ||
152 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); | |
153 | } | |
154 | ||
eb492e01 AB |
155 | int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level) |
156 | { | |
157 | __u8 authreq; | |
158 | ||
159 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, conn->hcon, sec_level); | |
160 | ||
161 | switch (sec_level) { | |
162 | case BT_SECURITY_MEDIUM: | |
163 | /* Encrypted, no MITM protection */ | |
164 | authreq = HCI_AT_NO_BONDING_MITM; | |
165 | break; | |
166 | ||
167 | case BT_SECURITY_HIGH: | |
168 | /* Bonding, MITM protection */ | |
169 | authreq = HCI_AT_GENERAL_BONDING_MITM; | |
170 | break; | |
171 | ||
172 | case BT_SECURITY_LOW: | |
173 | default: | |
174 | return 1; | |
175 | } | |
176 | ||
177 | if (conn->hcon->link_mode & HCI_LM_MASTER) { | |
178 | struct smp_cmd_pairing cp; | |
179 | cp.io_capability = 0x00; | |
180 | cp.oob_flag = 0x00; | |
181 | cp.max_key_size = 16; | |
182 | cp.init_key_dist = 0x00; | |
183 | cp.resp_key_dist = 0x00; | |
184 | cp.auth_req = authreq; | |
185 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); | |
186 | } else { | |
187 | struct smp_cmd_security_req cp; | |
188 | cp.auth_req = authreq; | |
189 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); | |
190 | } | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
195 | int smp_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) | |
196 | { | |
197 | __u8 code = skb->data[0]; | |
198 | __u8 reason; | |
199 | int err = 0; | |
200 | ||
201 | skb_pull(skb, sizeof(code)); | |
202 | ||
203 | switch (code) { | |
204 | case SMP_CMD_PAIRING_REQ: | |
88ba43b6 | 205 | smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
206 | break; |
207 | ||
208 | case SMP_CMD_PAIRING_FAIL: | |
209 | break; | |
210 | ||
211 | case SMP_CMD_PAIRING_RSP: | |
88ba43b6 AB |
212 | smp_cmd_pairing_rsp(conn, skb); |
213 | break; | |
214 | ||
215 | case SMP_CMD_SECURITY_REQ: | |
216 | smp_cmd_security_req(conn, skb); | |
217 | break; | |
218 | ||
eb492e01 | 219 | case SMP_CMD_PAIRING_CONFIRM: |
88ba43b6 AB |
220 | smp_cmd_pairing_confirm(conn, skb); |
221 | break; | |
222 | ||
eb492e01 | 223 | case SMP_CMD_PAIRING_RANDOM: |
88ba43b6 AB |
224 | smp_cmd_pairing_random(conn, skb); |
225 | break; | |
226 | ||
eb492e01 AB |
227 | case SMP_CMD_ENCRYPT_INFO: |
228 | case SMP_CMD_MASTER_IDENT: | |
229 | case SMP_CMD_IDENT_INFO: | |
230 | case SMP_CMD_IDENT_ADDR_INFO: | |
231 | case SMP_CMD_SIGN_INFO: | |
eb492e01 AB |
232 | default: |
233 | BT_DBG("Unknown command code 0x%2.2x", code); | |
234 | ||
235 | reason = SMP_CMD_NOTSUPP; | |
236 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), | |
237 | &reason); | |
238 | err = -EOPNOTSUPP; | |
239 | } | |
240 | ||
241 | kfree_skb(skb); | |
242 | return err; | |
243 | } |