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Bluetooth: Add support for storing the key size

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In some cases it will be useful having the key size used for
encrypting the link. For example, some profiles may restrict
some operations depending on the key length.

The key size is stored in the key that is passed to userspace
using the pin_length field in the key structure.

For now this field is only valid for LE controllers. 3.0+HS
controllers define the Read Encryption Key Size command, this
field is intended for storing the value returned by that
command.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
This commit is contained in:
Vinicius Costa Gomes 2011-07-08 18:31:45 -03:00 • committed by Gustavo F. Padovan
parent 5a0a8b4974
commit 726b4ffcaa
5 changed files with 16 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

14
net/bluetooth/smp.c
View file

@ -401,6 +401,7 @@ static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
SMP_MAX_ENC_KEY_SIZE - conn->smp_key_size);
hci_le_start_enc(hcon, ediv, rand, stk);
hcon->enc_key_size = conn->smp_key_size;
} else {
u8 stk[16], r[16], rand[8];
__le16 ediv;
@ -417,7 +418,8 @@ static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
memset(stk + conn->smp_key_size, 0,
SMP_MAX_ENC_KEY_SIZE - conn->smp_key_size);
hci_add_ltk(conn->hcon->hdev, 0, conn->dst, ediv, rand, stk);
hci_add_ltk(conn->hcon->hdev, 0, conn->dst, conn->smp_key_size,
ediv, rand, stk);
}
return 0;
@ -487,6 +489,8 @@ int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level)
hci_le_start_enc(hcon, master->ediv, master->rand,
key->val);
hcon->enc_key_size = key->pin_len;
goto done;
}
@ -528,8 +532,8 @@ static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb)
skb_pull(skb, sizeof(*rp));
hci_add_ltk(conn->hcon->hdev, 1, conn->src, rp->ediv,
rp->rand, conn->tk);
hci_add_ltk(conn->hcon->hdev, 1, conn->src, conn->smp_key_size,
rp->ediv, rp->rand, conn->tk);
smp_distribute_keys(conn, 1);
@ -654,8 +658,8 @@ int smp_distribute_keys(struct l2cap_conn *conn, __u8 force)
smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc);
hci_add_ltk(conn->hcon->hdev, 1, conn->dst, ediv,
ident.rand, enc.ltk);
hci_add_ltk(conn->hcon->hdev, 1, conn->dst, conn->smp_key_size,
ediv, ident.rand, enc.ltk);
ident.ediv = cpu_to_le16(ediv);