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Bluetooth: Move SMP crypto functions to a workqueue 

The function crypto_blkcipher_setkey() called by smp_e()
can sleep, so all the crypto work has to be moved to
hci_dev workqueue.

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 2011-09-05 14:31:31 -03:00 committed by Gustavo F. Padovan
parent 1c1def09c4
commit 8aab47574a
3 changed files with 185 additions and 103 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
include/net/bluetooth/smp.h
View File

@ -116,13 +116,18 @@ struct smp_cmd_security_req {
#define SMP_MAX_ENC_KEY_SIZE 16
struct smp_chan {
struct l2cap_conn *conn;
u8 preq[7]; /* SMP Pairing Request */
u8 prsp[7]; /* SMP Pairing Response */
u8 prnd[16]; /* SMP Pairing Random */
u8 prnd[16]; /* SMP Pairing Random (local) */
u8 rrnd[16]; /* SMP Pairing Random (remote) */
u8 pcnf[16]; /* SMP Pairing Confirm */
u8 tk[16]; /* SMP Temporary Key */
u8 smp_key_size;
struct crypto_blkcipher *tfm;
struct work_struct confirm;
struct work_struct random;
};
/* SMP Commands */
@ -130,4 +135,6 @@ int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level);
int smp_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb);
int smp_distribute_keys(struct l2cap_conn *conn, __u8 force);
void smp_chan_destroy(struct l2cap_conn *conn);
#endif /* __SMP_H */

2
net/bluetooth/l2cap_core.c
View File

@ -991,7 +991,7 @@ static void l2cap_conn_del(struct hci_conn *hcon, int err)
if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend)) {
del_timer(&conn->security_timer);
hci_conn_put(hcon);
smp_chan_destroy(conn);
}
hcon->l2cap_data = NULL;

277
net/bluetooth/smp.c
View File

@ -243,16 +243,170 @@ static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size)
return 0;
}
static void confirm_work(struct work_struct *work)
{
struct smp_chan *smp = container_of(work, struct smp_chan, confirm);
struct l2cap_conn *conn = smp->conn;
struct crypto_blkcipher *tfm;
struct smp_cmd_pairing_confirm cp;
int ret;
u8 res[16], reason;
BT_DBG("conn %p", conn);
tfm = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(tfm)) {
reason = SMP_UNSPECIFIED;
goto error;
}
smp->tfm = tfm;
if (conn->hcon->out)
ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp, 0,
conn->src, conn->hcon->dst_type, conn->dst,
res);
else
ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp,
conn->hcon->dst_type, conn->dst, 0, conn->src,
res);
if (ret) {
reason = SMP_UNSPECIFIED;
goto error;
}
swap128(res, cp.confirm_val);
smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp);
return;
error:
smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), &reason);
smp_chan_destroy(conn);
}
static void random_work(struct work_struct *work)
{
struct smp_chan *smp = container_of(work, struct smp_chan, random);
struct l2cap_conn *conn = smp->conn;
struct hci_conn *hcon = conn->hcon;
struct crypto_blkcipher *tfm = smp->tfm;
u8 reason, confirm[16], res[16], key[16];
int ret;
if (IS_ERR_OR_NULL(tfm)) {
reason = SMP_UNSPECIFIED;
goto error;
}
BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
if (hcon->out)
ret = smp_c1(tfm, smp->tk, smp->rrnd, smp->preq, smp->prsp, 0,
conn->src, hcon->dst_type, conn->dst,
res);
else
ret = smp_c1(tfm, smp->tk, smp->rrnd, smp->preq, smp->prsp,
hcon->dst_type, conn->dst, 0, conn->src,
res);
if (ret) {
reason = SMP_UNSPECIFIED;
goto error;
}
swap128(res, confirm);
if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) {
BT_ERR("Pairing failed (confirmation values mismatch)");
reason = SMP_CONFIRM_FAILED;
goto error;
}
if (hcon->out) {
u8 stk[16], rand[8];
__le16 ediv;
memset(rand, 0, sizeof(rand));
ediv = 0;
smp_s1(tfm, smp->tk, smp->rrnd, smp->prnd, key);
swap128(key, stk);
memset(stk + smp->smp_key_size, 0,
SMP_MAX_ENC_KEY_SIZE - smp->smp_key_size);
if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend)) {
reason = SMP_UNSPECIFIED;
goto error;
}
hci_le_start_enc(hcon, ediv, rand, stk);
hcon->enc_key_size = smp->smp_key_size;
} else {
u8 stk[16], r[16], rand[8];
__le16 ediv;
memset(rand, 0, sizeof(rand));
ediv = 0;
swap128(smp->prnd, r);
smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(r), r);
smp_s1(tfm, smp->tk, smp->prnd, smp->rrnd, key);
swap128(key, stk);
memset(stk + smp->smp_key_size, 0,
SMP_MAX_ENC_KEY_SIZE - smp->smp_key_size);
hci_add_ltk(hcon->hdev, 0, conn->dst, smp->smp_key_size,
ediv, rand, stk);
}
return;
error:
smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), &reason);
smp_chan_destroy(conn);
}
static struct smp_chan *smp_chan_create(struct l2cap_conn *conn)
{
struct smp_chan *smp;
smp = kzalloc(sizeof(struct smp_chan), GFP_ATOMIC);
if (!smp)
return NULL;
INIT_WORK(&smp->confirm, confirm_work);
INIT_WORK(&smp->random, random_work);
smp->conn = conn;
conn->smp_chan = smp;
hci_conn_hold(conn->hcon);
return smp;
}
void smp_chan_destroy(struct l2cap_conn *conn)
{
kfree(conn->smp_chan);
hci_conn_put(conn->hcon);
}
static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_cmd_pairing rsp, *req = (void *) skb->data;
struct smp_chan *smp = conn->smp_chan;
struct smp_chan *smp;
u8 key_size;
int ret;
BT_DBG("conn %p", conn);
if (!test_and_set_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend))
hci_conn_hold(conn->hcon);
smp = smp_chan_create(conn);
smp = conn->smp_chan;
smp->preq[0] = SMP_CMD_PAIRING_REQ;
memcpy(&smp->preq[1], req, sizeof(*req));
@ -271,6 +425,10 @@ static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
/* Just works */
memset(smp->tk, 0, sizeof(smp->tk));
ret = smp_rand(smp->prnd);
if (ret)
return SMP_UNSPECIFIED;
smp->prsp[0] = SMP_CMD_PAIRING_RSP;
memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
@ -282,12 +440,10 @@ static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_cmd_pairing *req, *rsp = (void *) skb->data;
struct smp_cmd_pairing_confirm cp;
struct smp_chan *smp = conn->smp_chan;
struct crypto_blkcipher *tfm = smp->tfm;
struct hci_dev *hdev = conn->hcon->hdev;
u8 key_size;
int ret;
u8 res[16], key_size;
BT_DBG("conn %p", conn);
@ -305,21 +461,14 @@ static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
/* Just works */
memset(smp->tk, 0, sizeof(smp->tk));
smp->prsp[0] = SMP_CMD_PAIRING_RSP;
memcpy(&smp->prsp[1], rsp, sizeof(*rsp));
ret = smp_rand(smp->prnd);
if (ret)
return SMP_UNSPECIFIED;
ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp, 0,
conn->src, conn->hcon->dst_type, conn->dst, res);
if (ret)
return SMP_UNSPECIFIED;
smp->prsp[0] = SMP_CMD_PAIRING_RSP;
memcpy(&smp->prsp[1], rsp, sizeof(*rsp));
swap128(res, cp.confirm_val);
smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp);
queue_work(hdev->workqueue, &smp->confirm);
return 0;
}
@ -327,7 +476,7 @@ static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_chan *smp = conn->smp_chan;
struct crypto_blkcipher *tfm = smp->tfm;
struct hci_dev *hdev = conn->hcon->hdev;
BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
@ -341,23 +490,7 @@ static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb)
smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(random),
random);
} else {
struct smp_cmd_pairing_confirm cp;
int ret;
u8 res[16];
ret = smp_rand(smp->prnd);
if (ret)
return SMP_UNSPECIFIED;
ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp,
conn->hcon->dst_type, conn->dst,
0, conn->src, res);
if (ret)
return SMP_CONFIRM_FAILED;
swap128(res, cp.confirm_val);
smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp);
queue_work(hdev->workqueue, &smp->confirm);
}
return 0;
@ -365,72 +498,15 @@ static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb)
static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct hci_conn *hcon = conn->hcon;
struct smp_chan *smp = conn->smp_chan;
struct crypto_blkcipher *tfm = smp->tfm;
int ret;
u8 key[16], res[16], random[16], confirm[16];
struct hci_dev *hdev = conn->hcon->hdev;
swap128(skb->data, random);
skb_pull(skb, sizeof(random));
BT_DBG("conn %p", conn);
if (conn->hcon->out)
ret = smp_c1(tfm, smp->tk, random, smp->preq, smp->prsp, 0,
conn->src, conn->hcon->dst_type, conn->dst,
res);
else
ret = smp_c1(tfm, smp->tk, random, smp->preq, smp->prsp,
conn->hcon->dst_type, conn->dst, 0, conn->src,
res);
if (ret)
return SMP_UNSPECIFIED;
swap128(skb->data, smp->rrnd);
skb_pull(skb, sizeof(smp->rrnd));
BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
swap128(res, confirm);
if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) {
BT_ERR("Pairing failed (confirmation values mismatch)");
return SMP_CONFIRM_FAILED;
}
if (conn->hcon->out) {
u8 stk[16], rand[8];
__le16 ediv;
memset(rand, 0, sizeof(rand));
ediv = 0;
smp_s1(tfm, smp->tk, random, smp->prnd, key);
swap128(key, stk);
memset(stk + smp->smp_key_size, 0,
SMP_MAX_ENC_KEY_SIZE - smp->smp_key_size);
if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend))
return SMP_UNSPECIFIED;
hci_le_start_enc(hcon, ediv, rand, stk);
hcon->enc_key_size = smp->smp_key_size;
} else {
u8 stk[16], r[16], rand[8];
__le16 ediv;
memset(rand, 0, sizeof(rand));
ediv = 0;
swap128(smp->prnd, r);
smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(r), r);
smp_s1(tfm, smp->tk, smp->prnd, random, key);
swap128(key, stk);
memset(stk + smp->smp_key_size, 0,
SMP_MAX_ENC_KEY_SIZE - smp->smp_key_size);
hci_add_ltk(conn->hcon->hdev, 0, conn->dst, smp->smp_key_size,
ediv, rand, stk);
}
queue_work(hdev->workqueue, &smp->random);
return 0;
}
@ -440,14 +516,14 @@ static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
struct smp_cmd_security_req *rp = (void *) skb->data;
struct smp_cmd_pairing cp;
struct hci_conn *hcon = conn->hcon;
struct smp_chan *smp = conn->smp_chan;
struct smp_chan *smp;
BT_DBG("conn %p", conn);
if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend))
return 0;
hci_conn_hold(hcon);
smp = smp_chan_create(conn);
skb_pull(skb, sizeof(*rp));
@ -502,8 +578,7 @@ int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level)
if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend))
return 0;
/* While SMP is going on */
hci_conn_hold(hcon);
smp = smp_chan_create(conn);
authreq = seclevel_to_authreq(sec_level);
@ -710,7 +785,7 @@ int smp_distribute_keys(struct l2cap_conn *conn, __u8 force)
if (conn->hcon->out || force) {
clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend);
del_timer(&conn->security_timer);
hci_conn_put(conn->hcon);
smp_chan_destroy(conn);
}
return 0;