Bluetooth: Move SMP fields to a separate structure

The objective is to make the core to have as little as possible
information about SMP procedures and logic. Now, all the SMP
specific information is hidden from the core.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

2 files changed, 54 insertions, 62 deletions

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 1d20683..b4e7cde 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -1523,11 +1523,6 @@ int hci_register_dev(struct hci_dev *hdev)
 	if (!hdev->workqueue)
 		goto nomem;
 
-	hdev->tfm = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC);
-	if (IS_ERR(hdev->tfm))
-		BT_INFO("Failed to load transform for ecb(aes): %ld",
-							PTR_ERR(hdev->tfm));
-
 	hci_register_sysfs(hdev);
 
 	hdev->rfkill = rfkill_alloc(hdev->name, &hdev->dev,
@@ -1576,9 +1571,6 @@ int hci_unregister_dev(struct hci_dev *hdev)
 					!test_bit(HCI_SETUP, &hdev->flags))
 		mgmt_index_removed(hdev->id);
 
-	if (!IS_ERR(hdev->tfm))
-		crypto_free_blkcipher(hdev->tfm);
-
 	hci_notify(hdev, HCI_DEV_UNREG);
 
 	if (hdev->rfkill) {
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index f0c67f6..b5e1b4a 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -232,11 +232,13 @@ static void build_pairing_cmd(struct l2cap_conn *conn,
 
 static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size)
 {
+	struct smp_chan *smp = conn->smp_chan;
+
 	if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) ||
 			(max_key_size < SMP_MIN_ENC_KEY_SIZE))
 		return SMP_ENC_KEY_SIZE;
 
-	conn->smp_key_size = max_key_size;
+	smp->smp_key_size = max_key_size;
 
 	return 0;
 }
@@ -244,6 +246,7 @@ static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size)
 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;
 	u8 key_size;
 
 	BT_DBG("conn %p", conn);
@@ -251,8 +254,8 @@ static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
 	if (!test_and_set_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend))
 		hci_conn_hold(conn->hcon);
 
-	conn->preq[0] = SMP_CMD_PAIRING_REQ;
-	memcpy(&conn->preq[1], req, sizeof(*req));
+	smp->preq[0] = SMP_CMD_PAIRING_REQ;
+	memcpy(&smp->preq[1], req, sizeof(*req));
 	skb_pull(skb, sizeof(*req));
 
 	if (req->oob_flag)
@@ -266,10 +269,10 @@ static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
 		return SMP_ENC_KEY_SIZE;
 
 	/* Just works */
-	memset(conn->tk, 0, sizeof(conn->tk));
+	memset(smp->tk, 0, sizeof(smp->tk));
 
-	conn->prsp[0] = SMP_CMD_PAIRING_RSP;
-	memcpy(&conn->prsp[1], &rsp, sizeof(rsp));
+	smp->prsp[0] = SMP_CMD_PAIRING_RSP;
+	memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
 
 	smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp);
 
@@ -280,7 +283,9 @@ 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 crypto_blkcipher *tfm = conn->hcon->hdev->tfm;
+	struct smp_chan *smp = conn->smp_chan;
+	struct crypto_blkcipher *tfm = smp->tfm;
+
 	int ret;
 	u8 res[16], key_size;
 
@@ -288,7 +293,7 @@ static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
 
 	skb_pull(skb, sizeof(*rsp));
 
-	req = (void *) &conn->preq[1];
+	req = (void *) &smp->preq[1];
 
 	key_size = min(req->max_key_size, rsp->max_key_size);
 	if (check_enc_key_size(conn, key_size))
@@ -298,16 +303,16 @@ static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
 		return SMP_OOB_NOT_AVAIL;
 
 	/* Just works */
-	memset(conn->tk, 0, sizeof(conn->tk));
+	memset(smp->tk, 0, sizeof(smp->tk));
 
-	conn->prsp[0] = SMP_CMD_PAIRING_RSP;
-	memcpy(&conn->prsp[1], rsp, sizeof(*rsp));
+	smp->prsp[0] = SMP_CMD_PAIRING_RSP;
+	memcpy(&smp->prsp[1], rsp, sizeof(*rsp));
 
-	ret = smp_rand(conn->prnd);
+	ret = smp_rand(smp->prnd);
 	if (ret)
 		return SMP_UNSPECIFIED;
 
-	ret = smp_c1(tfm, conn->tk, conn->prnd, conn->preq, conn->prsp, 0,
+	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;
@@ -321,17 +326,18 @@ 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 crypto_blkcipher *tfm = conn->hcon->hdev->tfm;
+	struct smp_chan *smp = conn->smp_chan;
+	struct crypto_blkcipher *tfm = smp->tfm;
 
 	BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
 
-	memcpy(conn->pcnf, skb->data, sizeof(conn->pcnf));
-	skb_pull(skb, sizeof(conn->pcnf));
+	memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf));
+	skb_pull(skb, sizeof(smp->pcnf));
 
 	if (conn->hcon->out) {
 		u8 random[16];
 
-		swap128(conn->prnd, random);
+		swap128(smp->prnd, random);
 		smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(random),
 								random);
 	} else {
@@ -339,11 +345,11 @@ static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb)
 		int ret;
 		u8 res[16];
 
-		ret = smp_rand(conn->prnd);
+		ret = smp_rand(smp->prnd);
 		if (ret)
 			return SMP_UNSPECIFIED;
 
-		ret = smp_c1(tfm, conn->tk, conn->prnd, conn->preq, conn->prsp,
+		ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp,
 						conn->hcon->dst_type, conn->dst,
 						0, conn->src, res);
 		if (ret)
@@ -360,7 +366,8 @@ 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 crypto_blkcipher *tfm = hcon->hdev->tfm;
+	struct smp_chan *smp = conn->smp_chan;
+	struct crypto_blkcipher *tfm = smp->tfm;
 	int ret;
 	u8 key[16], res[16], random[16], confirm[16];
 
@@ -368,11 +375,11 @@ static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
 	skb_pull(skb, sizeof(random));
 
 	if (conn->hcon->out)
-		ret = smp_c1(tfm, conn->tk, random, conn->preq, conn->prsp, 0,
+		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, conn->tk, random, conn->preq, conn->prsp,
+		ret = smp_c1(tfm, smp->tk, random, smp->preq, smp->prsp,
 				conn->hcon->dst_type, conn->dst, 0, conn->src,
 				res);
 	if (ret)
@@ -382,7 +389,7 @@ static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
 
 	swap128(res, confirm);
 
-	if (memcmp(conn->pcnf, confirm, sizeof(conn->pcnf)) != 0) {
+	if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) {
 		BT_ERR("Pairing failed (confirmation values mismatch)");
 		return SMP_CONFIRM_FAILED;
 	}
@@ -394,17 +401,17 @@ static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
 		memset(rand, 0, sizeof(rand));
 		ediv = 0;
 
-		smp_s1(tfm, conn->tk, random, conn->prnd, key);
+		smp_s1(tfm, smp->tk, random, smp->prnd, key);
 		swap128(key, stk);
 
-		memset(stk + conn->smp_key_size, 0,
-				SMP_MAX_ENC_KEY_SIZE - conn->smp_key_size);
+		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 = conn->smp_key_size;
+		hcon->enc_key_size = smp->smp_key_size;
 	} else {
 		u8 stk[16], r[16], rand[8];
 		__le16 ediv;
@@ -412,16 +419,16 @@ static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
 		memset(rand, 0, sizeof(rand));
 		ediv = 0;
 
-		swap128(conn->prnd, r);
+		swap128(smp->prnd, r);
 		smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(r), r);
 
-		smp_s1(tfm, conn->tk, conn->prnd, random, key);
+		smp_s1(tfm, smp->tk, smp->prnd, random, key);
 		swap128(key, stk);
 
-		memset(stk + conn->smp_key_size, 0,
-				SMP_MAX_ENC_KEY_SIZE - conn->smp_key_size);
+		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, conn->smp_key_size,
+		hci_add_ltk(conn->hcon->hdev, 0, conn->dst, smp->smp_key_size,
 							ediv, rand, stk);
 	}
 
@@ -433,6 +440,7 @@ 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;
 
 	BT_DBG("conn %p", conn);
 
@@ -446,8 +454,8 @@ static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
 	memset(&cp, 0, sizeof(cp));
 	build_pairing_cmd(conn, &cp, NULL, rp->auth_req);
 
-	conn->preq[0] = SMP_CMD_PAIRING_REQ;
-	memcpy(&conn->preq[1], &cp, sizeof(cp));
+	smp->preq[0] = SMP_CMD_PAIRING_REQ;
+	memcpy(&smp->preq[1], &cp, sizeof(cp));
 
 	smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
 
@@ -457,6 +465,7 @@ static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
 int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level)
 {
 	struct hci_conn *hcon = conn->hcon;
+	struct smp_chan *smp = conn->smp_chan;
 	__u8 authreq;
 
 	BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level);
@@ -464,9 +473,6 @@ int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level)
 	if (!lmp_host_le_capable(hcon->hdev))
 		return 1;
 
-	if (IS_ERR(hcon->hdev->tfm))
-		return 1;
-
 	if (sec_level == BT_SECURITY_LOW)
 		return 1;
 
@@ -505,8 +511,8 @@ int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level)
 		struct smp_cmd_pairing cp;
 
 		build_pairing_cmd(conn, &cp, NULL, authreq);
-		conn->preq[0] = SMP_CMD_PAIRING_REQ;
-		memcpy(&conn->preq[1], &cp, sizeof(cp));
+		smp->preq[0] = SMP_CMD_PAIRING_REQ;
+		memcpy(&smp->preq[1], &cp, sizeof(cp));
 
 		smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
 	} else {
@@ -524,10 +530,11 @@ done:
 static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb)
 {
 	struct smp_cmd_encrypt_info *rp = (void *) skb->data;
+	struct smp_chan *smp = conn->smp_chan;
 
 	skb_pull(skb, sizeof(*rp));
 
-	memcpy(conn->tk, rp->ltk, sizeof(conn->tk));
+	memcpy(smp->tk, rp->ltk, sizeof(smp->tk));
 
 	return 0;
 }
@@ -535,11 +542,12 @@ static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb)
 static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb)
 {
 	struct smp_cmd_master_ident *rp = (void *) skb->data;
+	struct smp_chan *smp = conn->smp_chan;
 
 	skb_pull(skb, sizeof(*rp));
 
-	hci_add_ltk(conn->hcon->hdev, 1, conn->src, conn->smp_key_size,
-						rp->ediv, rp->rand, conn->tk);
+	hci_add_ltk(conn->hcon->hdev, 1, conn->src, smp->smp_key_size,
+						rp->ediv, rp->rand, smp->tk);
 
 	smp_distribute_keys(conn, 1);
 
@@ -558,12 +566,6 @@ int smp_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
 		goto done;
 	}
 
-	if (IS_ERR(conn->hcon->hdev->tfm)) {
-		err = PTR_ERR(conn->hcon->hdev->tfm);
-		reason = SMP_PAIRING_NOTSUPP;
-		goto done;
-	}
-
 	skb_pull(skb, sizeof(code));
 
 	switch (code) {
@@ -627,23 +629,21 @@ done:
 int smp_distribute_keys(struct l2cap_conn *conn, __u8 force)
 {
 	struct smp_cmd_pairing *req, *rsp;
+	struct smp_chan *smp = conn->smp_chan;
 	__u8 *keydist;
 
 	BT_DBG("conn %p force %d", conn, force);
 
-	if (IS_ERR(conn->hcon->hdev->tfm))
-		return PTR_ERR(conn->hcon->hdev->tfm);
-
 	if (!test_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend))
 		return 0;
 
-	rsp = (void *) &conn->prsp[1];
+	rsp = (void *) &smp->prsp[1];
 
 	/* The responder sends its keys first */
 	if (!force && conn->hcon->out && (rsp->resp_key_dist & 0x07))
 		return 0;
 
-	req = (void *) &conn->preq[1];
+	req = (void *) &smp->preq[1];
 
 	if (conn->hcon->out) {
 		keydist = &rsp->init_key_dist;
@@ -667,7 +667,7 @@ 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, conn->smp_key_size,
+		hci_add_ltk(conn->hcon->hdev, 1, conn->dst, smp->smp_key_size,
 						ediv, ident.rand, enc.ltk);
 
 		ident.ediv = cpu_to_le16(ediv);