/*
* This is the main function responsible for cryptography (ie. communication
* with crypto(9) subsystem).
*
* BIO_READ:
* g_eli_start -> g_eli_crypto_read -> g_io_request -> g_eli_read_done -> G_ELI_CRYPTO_RUN -> g_eli_crypto_read_done -> g_io_deliver
* BIO_WRITE:
* g_eli_start -> G_ELI_CRYPTO_RUN -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver
*/
void
g_eli_crypto_run(struct g_eli_worker *wr, struct bio *bp)
{
struct g_eli_softc *sc;
struct cryptop *crp;
struct cryptodesc *crd;
u_int i, nsec, secsize;
int err, error;
off_t dstoff;
size_t size;
u_char *p, *data;
G_ELI_LOGREQ(3, bp, "%s", __func__);
bp->bio_pflags = wr->w_number;
sc = wr->w_softc;
secsize = LIST_FIRST(&sc->sc_geom->provider)->sectorsize;
nsec = bp->bio_length / secsize;
/*
* Calculate how much memory do we need.
* We need separate crypto operation for every single sector.
* It is much faster to calculate total amount of needed memory here and
* do the allocation once instead of allocating memory in pieces (many,
* many pieces).
*/
size = sizeof(*crp) * nsec;
size += sizeof(*crd) * nsec;
/*
* If we write the data we cannot destroy current bio_data content,
* so we need to allocate more memory for encrypted data.
*/
if (bp->bio_cmd == BIO_WRITE)
size += bp->bio_length;
p = malloc(size, M_ELI, M_WAITOK);
bp->bio_inbed = 0;
bp->bio_children = nsec;
bp->bio_driver2 = p;
if (bp->bio_cmd == BIO_READ)
data = bp->bio_data;
else {
data = p;
p += bp->bio_length;
bcopy(bp->bio_data, data, bp->bio_length);
}
error = 0;
for (i = 0, dstoff = bp->bio_offset; i < nsec; i++, dstoff += secsize) {
crp = (struct cryptop *)p; p += sizeof(*crp);
crd = (struct cryptodesc *)p; p += sizeof(*crd);
crp->crp_sid = wr->w_sid;
crp->crp_ilen = secsize;
crp->crp_olen = secsize;
crp->crp_opaque = (void *)bp;
crp->crp_buf = (void *)data;
data += secsize;
if (bp->bio_cmd == BIO_WRITE)
crp->crp_callback = g_eli_crypto_write_done;
else /* if (bp->bio_cmd == BIO_READ) */
crp->crp_callback = g_eli_crypto_read_done;
crp->crp_flags = CRYPTO_F_CBIFSYNC;
if (g_eli_batch)
crp->crp_flags |= CRYPTO_F_BATCH;
crp->crp_desc = crd;
crd->crd_skip = 0;
crd->crd_len = secsize;
crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
if ((sc->sc_flags & G_ELI_FLAG_SINGLE_KEY) == 0)
crd->crd_flags |= CRD_F_KEY_EXPLICIT;
if (bp->bio_cmd == BIO_WRITE)
crd->crd_flags |= CRD_F_ENCRYPT;
crd->crd_alg = sc->sc_ealgo;
crd->crd_key = g_eli_key_hold(sc, dstoff, secsize);
crd->crd_klen = sc->sc_ekeylen;
if (sc->sc_ealgo == CRYPTO_AES_XTS)
crd->crd_klen <<= 1;
g_eli_crypto_ivgen(sc, dstoff, crd->crd_iv,
sizeof(crd->crd_iv));
crd->crd_next = NULL;
crp->crp_etype = 0;
err = crypto_dispatch(crp);
if (error == 0)
error = err;
}
if (bp->bio_error == 0)
bp->bio_error = error;
}
/*
* This is the main function responsible for cryptography (ie. communication
* with crypto(9) subsystem).
*
* BIO_READ:
* g_eli_start -> g_eli_auth_read -> g_io_request -> g_eli_read_done -> G_ELI_AUTH_RUN -> g_eli_auth_read_done -> g_io_deliver
* BIO_WRITE:
* g_eli_start -> G_ELI_AUTH_RUN -> g_eli_auth_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver
*/
void
g_eli_auth_run(struct g_eli_worker *wr, struct bio *bp)
{
struct g_eli_softc *sc;
struct cryptop *crp;
struct cryptodesc *crde, *crda;
struct uio *uio;
struct iovec *iov;
u_int i, lsec, nsec, data_secsize, decr_secsize, encr_secsize;
off_t dstoff;
int err, error;
u_char *p, *data, *auth, *authkey, *plaindata;
G_ELI_LOGREQ(3, bp, "%s", __func__);
bp->bio_pflags = wr->w_number;
sc = wr->w_softc;
/* Sectorsize of decrypted provider eg. 4096. */
decr_secsize = bp->bio_to->sectorsize;
/* The real sectorsize of encrypted provider, eg. 512. */
encr_secsize = LIST_FIRST(&sc->sc_geom->consumer)->provider->sectorsize;
/* Number of data bytes in one encrypted sector, eg. 480. */
data_secsize = sc->sc_data_per_sector;
/* Number of sectors from decrypted provider, eg. 2. */
nsec = bp->bio_length / decr_secsize;
/* Number of sectors from encrypted provider, eg. 18. */
nsec = (nsec * sc->sc_bytes_per_sector) / encr_secsize;
/* Last sector number in every big sector, eg. 9. */
lsec = sc->sc_bytes_per_sector / encr_secsize;
/* Destination offset, used for IV generation. */
dstoff = (bp->bio_offset / bp->bio_to->sectorsize) * sc->sc_bytes_per_sector;
auth = NULL; /* Silence compiler warning. */
plaindata = bp->bio_data;
if (bp->bio_cmd == BIO_READ) {
data = bp->bio_driver2;
auth = data + encr_secsize * nsec;
p = auth + sc->sc_alen * nsec;
} else {
size_t size;
size = encr_secsize * nsec;
size += sizeof(*crp) * nsec;
size += sizeof(*crde) * nsec;
size += sizeof(*crda) * nsec;
size += G_ELI_AUTH_SECKEYLEN * nsec;
size += sizeof(*uio) * nsec;
size += sizeof(*iov) * nsec;
data = malloc(size, M_ELI, M_WAITOK);
bp->bio_driver2 = data;
p = data + encr_secsize * nsec;
}
bp->bio_inbed = 0;
bp->bio_children = nsec;
error = 0;
for (i = 1; i <= nsec; i++, dstoff += encr_secsize) {
crp = (struct cryptop *)p; p += sizeof(*crp);
crde = (struct cryptodesc *)p; p += sizeof(*crde);
crda = (struct cryptodesc *)p; p += sizeof(*crda);
authkey = (u_char *)p; p += G_ELI_AUTH_SECKEYLEN;
uio = (struct uio *)p; p += sizeof(*uio);
iov = (struct iovec *)p; p += sizeof(*iov);
data_secsize = sc->sc_data_per_sector;
if ((i % lsec) == 0)
data_secsize = decr_secsize % data_secsize;
if (bp->bio_cmd == BIO_READ) {
/* Remember read HMAC. */
bcopy(data, auth, sc->sc_alen);
auth += sc->sc_alen;
/* TODO: bzero(9) can be commented out later. */
bzero(data, sc->sc_alen);
} else {
bcopy(plaindata, data + sc->sc_alen, data_secsize);
plaindata += data_secsize;
}
iov->iov_len = sc->sc_alen + data_secsize;
iov->iov_base = data;
data += encr_secsize;
uio->uio_iov = iov;
uio->uio_iovcnt = 1;
uio->uio_segflg = UIO_SYSSPACE;
uio->uio_resid = iov->iov_len;
crp->crp_sid = wr->w_sid;
crp->crp_ilen = uio->uio_resid;
crp->crp_olen = data_secsize;
crp->crp_opaque = (void *)bp;
crp->crp_buf = (void *)uio;
crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIFSYNC | CRYPTO_F_REL;
if (g_eli_batch)
crp->crp_flags |= CRYPTO_F_BATCH;
if (bp->bio_cmd == BIO_WRITE) {
crp->crp_callback = g_eli_auth_write_done;
crp->crp_desc = crde;
crde->crd_next = crda;
crda->crd_next = NULL;
} else {
crp->crp_callback = g_eli_auth_read_done;
crp->crp_desc = crda;
crda->crd_next = crde;
crde->crd_next = NULL;
}
crde->crd_skip = sc->sc_alen;
crde->crd_len = data_secsize;
crde->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
if ((sc->sc_flags & G_ELI_FLAG_FIRST_KEY) == 0)
crde->crd_flags |= CRD_F_KEY_EXPLICIT;
if (bp->bio_cmd == BIO_WRITE)
crde->crd_flags |= CRD_F_ENCRYPT;
crde->crd_alg = sc->sc_ealgo;
crde->crd_key = g_eli_key_hold(sc, dstoff, encr_secsize);
crde->crd_klen = sc->sc_ekeylen;
if (sc->sc_ealgo == CRYPTO_AES_XTS)
crde->crd_klen <<= 1;
g_eli_crypto_ivgen(sc, dstoff, crde->crd_iv,
sizeof(crde->crd_iv));
crda->crd_skip = sc->sc_alen;
crda->crd_len = data_secsize;
crda->crd_inject = 0;
crda->crd_flags = CRD_F_KEY_EXPLICIT;
crda->crd_alg = sc->sc_aalgo;
g_eli_auth_keygen(sc, dstoff, authkey);
crda->crd_key = authkey;
crda->crd_klen = G_ELI_AUTH_SECKEYLEN * 8;
crp->crp_etype = 0;
err = crypto_dispatch(crp);
if (err != 0 && error == 0)
error = err;
}
if (bp->bio_error == 0)
bp->bio_error = error;
}
