diff options
author | Marcel Holtmann <marcel@holtmann.org> | 2015-03-16 01:10:19 -0700 |
---|---|---|
committer | Johan Hedberg <johan.hedberg@intel.com> | 2015-03-16 10:31:05 +0200 |
commit | 88a479d9507eb7a510a612705aa686c52d24b2ab (patch) | |
tree | b49bcb4e3f33138e4626eaacf4dc9871ad2d78ca /net/bluetooth/smp.c | |
parent | 276812ec3e945493443e399921a07e9d6aa4d5b2 (diff) | |
download | op-kernel-dev-88a479d9507eb7a510a612705aa686c52d24b2ab.zip op-kernel-dev-88a479d9507eb7a510a612705aa686c52d24b2ab.tar.gz |
Bluetooth: Create SMP device structure for local crypto context
Every Bluetooth Low Energy controller requires a local crypto context
to handle the resolvable private addresses. At the moment this is just
a single crypto context, but for out-of-band data generation it will
require an additional. To facility this, create a struct smp_dev that
will hold all the extra information. This patch is just the refactoring
in preparation for future changes.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Diffstat (limited to 'net/bluetooth/smp.c')
-rw-r--r-- | net/bluetooth/smp.c | 47 |
1 files changed, 31 insertions, 16 deletions
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c index a2be6fc..952ba63 100644 --- a/net/bluetooth/smp.c +++ b/net/bluetooth/smp.c @@ -73,6 +73,10 @@ enum { SMP_FLAG_OOB, }; +struct smp_dev { + struct crypto_blkcipher *tfm_aes; +}; + struct smp_chan { struct l2cap_conn *conn; struct delayed_work security_timer; @@ -478,18 +482,18 @@ bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16], const bdaddr_t *bdaddr) { struct l2cap_chan *chan = hdev->smp_data; - struct crypto_blkcipher *tfm; + struct smp_dev *smp; u8 hash[3]; int err; if (!chan || !chan->data) return false; - tfm = chan->data; + smp = chan->data; BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk); - err = smp_ah(tfm, irk, &bdaddr->b[3], hash); + err = smp_ah(smp->tfm_aes, irk, &bdaddr->b[3], hash); if (err) return false; @@ -499,20 +503,20 @@ bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16], int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa) { struct l2cap_chan *chan = hdev->smp_data; - struct crypto_blkcipher *tfm; + struct smp_dev *smp; int err; if (!chan || !chan->data) return -EOPNOTSUPP; - tfm = chan->data; + smp = chan->data; get_random_bytes(&rpa->b[3], 3); rpa->b[5] &= 0x3f; /* Clear two most significant bits */ rpa->b[5] |= 0x40; /* Set second most significant bit */ - err = smp_ah(tfm, irk, &rpa->b[3], rpa->b); + err = smp_ah(smp->tfm_aes, irk, &rpa->b[3], rpa->b); if (err < 0) return err; @@ -2930,27 +2934,36 @@ static const struct l2cap_ops smp_root_chan_ops = { static struct l2cap_chan *smp_add_cid(struct hci_dev *hdev, u16 cid) { struct l2cap_chan *chan; - struct crypto_blkcipher *tfm_aes; + struct smp_dev *smp; + struct crypto_blkcipher *tfm_aes; if (cid == L2CAP_CID_SMP_BREDR) { - tfm_aes = NULL; + smp = NULL; goto create_chan; } - tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, 0); + smp = kzalloc(sizeof(*smp), GFP_KERNEL); + if (!smp) + return ERR_PTR(-ENOMEM); + + tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); if (IS_ERR(tfm_aes)) { - BT_ERR("Unable to create crypto context"); + BT_ERR("Unable to create ECB crypto context"); + kzfree(smp); return ERR_CAST(tfm_aes); } + smp->tfm_aes = tfm_aes; + create_chan: chan = l2cap_chan_create(); if (!chan) { - crypto_free_blkcipher(tfm_aes); + crypto_free_blkcipher(smp->tfm_aes); + kzfree(smp); return ERR_PTR(-ENOMEM); } - chan->data = tfm_aes; + chan->data = smp; l2cap_add_scid(chan, cid); @@ -2983,14 +2996,16 @@ create_chan: static void smp_del_chan(struct l2cap_chan *chan) { - struct crypto_blkcipher *tfm_aes; + struct smp_dev *smp; BT_DBG("chan %p", chan); - tfm_aes = chan->data; - if (tfm_aes) { + smp = chan->data; + if (smp) { chan->data = NULL; - crypto_free_blkcipher(tfm_aes); + if (smp->tfm_aes) + crypto_free_blkcipher(smp->tfm_aes); + kzfree(smp); } l2cap_chan_put(chan); |