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 | ||
67 | int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level) | |
68 | { | |
69 | __u8 authreq; | |
70 | ||
71 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, conn->hcon, sec_level); | |
72 | ||
73 | switch (sec_level) { | |
74 | case BT_SECURITY_MEDIUM: | |
75 | /* Encrypted, no MITM protection */ | |
76 | authreq = HCI_AT_NO_BONDING_MITM; | |
77 | break; | |
78 | ||
79 | case BT_SECURITY_HIGH: | |
80 | /* Bonding, MITM protection */ | |
81 | authreq = HCI_AT_GENERAL_BONDING_MITM; | |
82 | break; | |
83 | ||
84 | case BT_SECURITY_LOW: | |
85 | default: | |
86 | return 1; | |
87 | } | |
88 | ||
89 | if (conn->hcon->link_mode & HCI_LM_MASTER) { | |
90 | struct smp_cmd_pairing cp; | |
91 | cp.io_capability = 0x00; | |
92 | cp.oob_flag = 0x00; | |
93 | cp.max_key_size = 16; | |
94 | cp.init_key_dist = 0x00; | |
95 | cp.resp_key_dist = 0x00; | |
96 | cp.auth_req = authreq; | |
97 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); | |
98 | } else { | |
99 | struct smp_cmd_security_req cp; | |
100 | cp.auth_req = authreq; | |
101 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); | |
102 | } | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
107 | int smp_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) | |
108 | { | |
109 | __u8 code = skb->data[0]; | |
110 | __u8 reason; | |
111 | int err = 0; | |
112 | ||
113 | skb_pull(skb, sizeof(code)); | |
114 | ||
115 | switch (code) { | |
116 | case SMP_CMD_PAIRING_REQ: | |
117 | reason = SMP_PAIRING_NOTSUPP; | |
118 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), | |
119 | &reason); | |
120 | err = -EOPNOTSUPP; | |
121 | break; | |
122 | ||
123 | case SMP_CMD_PAIRING_FAIL: | |
124 | break; | |
125 | ||
126 | case SMP_CMD_PAIRING_RSP: | |
127 | case SMP_CMD_PAIRING_CONFIRM: | |
128 | case SMP_CMD_PAIRING_RANDOM: | |
129 | case SMP_CMD_ENCRYPT_INFO: | |
130 | case SMP_CMD_MASTER_IDENT: | |
131 | case SMP_CMD_IDENT_INFO: | |
132 | case SMP_CMD_IDENT_ADDR_INFO: | |
133 | case SMP_CMD_SIGN_INFO: | |
134 | case SMP_CMD_SECURITY_REQ: | |
135 | default: | |
136 | BT_DBG("Unknown command code 0x%2.2x", code); | |
137 | ||
138 | reason = SMP_CMD_NOTSUPP; | |
139 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), | |
140 | &reason); | |
141 | err = -EOPNOTSUPP; | |
142 | } | |
143 | ||
144 | kfree_skb(skb); | |
145 | return err; | |
146 | } |