g_eli_privacy.c revision 213063
1159307Spjd/*- 2159307Spjd * Copyright (c) 2005-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3159307Spjd * All rights reserved. 4159307Spjd * 5159307Spjd * Redistribution and use in source and binary forms, with or without 6159307Spjd * modification, are permitted provided that the following conditions 7159307Spjd * are met: 8159307Spjd * 1. Redistributions of source code must retain the above copyright 9159307Spjd * notice, this list of conditions and the following disclaimer. 10159307Spjd * 2. Redistributions in binary form must reproduce the above copyright 11159307Spjd * notice, this list of conditions and the following disclaimer in the 12159307Spjd * documentation and/or other materials provided with the distribution. 13159307Spjd * 14159307Spjd * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15159307Spjd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16159307Spjd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17159307Spjd * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18159307Spjd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19159307Spjd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20159307Spjd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21159307Spjd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22159307Spjd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23159307Spjd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24159307Spjd * SUCH DAMAGE. 25159307Spjd */ 26159307Spjd 27159307Spjd#include <sys/cdefs.h> 28159307Spjd__FBSDID("$FreeBSD: head/sys/geom/eli/g_eli_privacy.c 213063 2010-09-23 11:23:10Z pjd $"); 29159307Spjd 30159307Spjd#include <sys/param.h> 31159307Spjd#include <sys/systm.h> 32159307Spjd#include <sys/kernel.h> 33159307Spjd#include <sys/linker.h> 34159307Spjd#include <sys/module.h> 35159307Spjd#include <sys/lock.h> 36159307Spjd#include <sys/mutex.h> 37159307Spjd#include <sys/bio.h> 38159307Spjd#include <sys/sysctl.h> 39159307Spjd#include <sys/malloc.h> 40159307Spjd#include <sys/kthread.h> 41159307Spjd#include <sys/proc.h> 42159307Spjd#include <sys/sched.h> 43159307Spjd#include <sys/smp.h> 44159307Spjd#include <sys/uio.h> 45159307Spjd#include <sys/vnode.h> 46159307Spjd 47159307Spjd#include <vm/uma.h> 48159307Spjd 49159307Spjd#include <geom/geom.h> 50159307Spjd#include <geom/eli/g_eli.h> 51159307Spjd#include <geom/eli/pkcs5v2.h> 52159307Spjd 53159307Spjd/* 54159307Spjd * Code paths: 55159307Spjd * BIO_READ: 56159307Spjd * g_eli_start -> g_io_request -> g_eli_read_done -> g_eli_crypto_run -> g_eli_crypto_read_done -> g_io_deliver 57159307Spjd * BIO_WRITE: 58159307Spjd * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver 59159307Spjd */ 60159307Spjd 61159307SpjdMALLOC_DECLARE(M_ELI); 62159307Spjd 63159307Spjd/* 64159307Spjd * The function is called after we read and decrypt data. 65159307Spjd * 66159307Spjd * g_eli_start -> g_io_request -> g_eli_read_done -> g_eli_crypto_run -> G_ELI_CRYPTO_READ_DONE -> g_io_deliver 67159307Spjd */ 68159307Spjdstatic int 69159307Spjdg_eli_crypto_read_done(struct cryptop *crp) 70159307Spjd{ 71159307Spjd struct bio *bp; 72159307Spjd 73159307Spjd if (crp->crp_etype == EAGAIN) { 74159307Spjd if (g_eli_crypto_rerun(crp) == 0) 75159307Spjd return (0); 76159307Spjd } 77159307Spjd bp = (struct bio *)crp->crp_opaque; 78159307Spjd bp->bio_inbed++; 79159307Spjd if (crp->crp_etype == 0) { 80159307Spjd G_ELI_DEBUG(3, "Crypto READ request done (%d/%d).", 81159307Spjd bp->bio_inbed, bp->bio_children); 82159307Spjd bp->bio_completed += crp->crp_olen; 83159307Spjd } else { 84159307Spjd G_ELI_DEBUG(1, "Crypto READ request failed (%d/%d) error=%d.", 85159307Spjd bp->bio_inbed, bp->bio_children, crp->crp_etype); 86159307Spjd if (bp->bio_error == 0) 87159307Spjd bp->bio_error = crp->crp_etype; 88159307Spjd } 89159307Spjd /* 90159307Spjd * Do we have all sectors already? 91159307Spjd */ 92159307Spjd if (bp->bio_inbed < bp->bio_children) 93159307Spjd return (0); 94159307Spjd free(bp->bio_driver2, M_ELI); 95159307Spjd bp->bio_driver2 = NULL; 96159307Spjd if (bp->bio_error != 0) { 97159307Spjd G_ELI_LOGREQ(0, bp, "Crypto READ request failed (error=%d).", 98159307Spjd bp->bio_error); 99159307Spjd bp->bio_completed = 0; 100159307Spjd } 101159307Spjd /* 102159307Spjd * Read is finished, send it up. 103159307Spjd */ 104159307Spjd g_io_deliver(bp, bp->bio_error); 105159307Spjd return (0); 106159307Spjd} 107159307Spjd 108159307Spjd/* 109159307Spjd * The function is called after data encryption. 110159307Spjd * 111159307Spjd * g_eli_start -> g_eli_crypto_run -> G_ELI_CRYPTO_WRITE_DONE -> g_io_request -> g_eli_write_done -> g_io_deliver 112159307Spjd */ 113159307Spjdstatic int 114159307Spjdg_eli_crypto_write_done(struct cryptop *crp) 115159307Spjd{ 116159307Spjd struct g_geom *gp; 117159307Spjd struct g_consumer *cp; 118159307Spjd struct bio *bp, *cbp; 119159307Spjd 120159307Spjd if (crp->crp_etype == EAGAIN) { 121159307Spjd if (g_eli_crypto_rerun(crp) == 0) 122159307Spjd return (0); 123159307Spjd } 124159307Spjd bp = (struct bio *)crp->crp_opaque; 125159307Spjd bp->bio_inbed++; 126159307Spjd if (crp->crp_etype == 0) { 127159307Spjd G_ELI_DEBUG(3, "Crypto WRITE request done (%d/%d).", 128159307Spjd bp->bio_inbed, bp->bio_children); 129159307Spjd } else { 130159307Spjd G_ELI_DEBUG(1, "Crypto WRITE request failed (%d/%d) error=%d.", 131159307Spjd bp->bio_inbed, bp->bio_children, crp->crp_etype); 132159307Spjd if (bp->bio_error == 0) 133159307Spjd bp->bio_error = crp->crp_etype; 134159307Spjd } 135159307Spjd /* 136159307Spjd * All sectors are already encrypted? 137159307Spjd */ 138159307Spjd if (bp->bio_inbed < bp->bio_children) 139159307Spjd return (0); 140159307Spjd bp->bio_inbed = 0; 141159307Spjd bp->bio_children = 1; 142159307Spjd cbp = bp->bio_driver1; 143159307Spjd bp->bio_driver1 = NULL; 144159307Spjd if (bp->bio_error != 0) { 145159307Spjd G_ELI_LOGREQ(0, bp, "Crypto WRITE request failed (error=%d).", 146159307Spjd bp->bio_error); 147159307Spjd free(bp->bio_driver2, M_ELI); 148159307Spjd bp->bio_driver2 = NULL; 149159307Spjd g_destroy_bio(cbp); 150159307Spjd g_io_deliver(bp, bp->bio_error); 151159307Spjd return (0); 152159307Spjd } 153159307Spjd cbp->bio_data = bp->bio_driver2; 154159307Spjd cbp->bio_done = g_eli_write_done; 155159307Spjd gp = bp->bio_to->geom; 156159307Spjd cp = LIST_FIRST(&gp->consumer); 157159307Spjd cbp->bio_to = cp->provider; 158159307Spjd G_ELI_LOGREQ(2, cbp, "Sending request."); 159159307Spjd /* 160159307Spjd * Send encrypted data to the provider. 161159307Spjd */ 162159307Spjd g_io_request(cbp, cp); 163159307Spjd return (0); 164159307Spjd} 165159307Spjd 166159307Spjd/* 167159307Spjd * This is the main function responsible for cryptography (ie. communication 168159307Spjd * with crypto(9) subsystem). 169159307Spjd */ 170159307Spjdvoid 171159307Spjdg_eli_crypto_run(struct g_eli_worker *wr, struct bio *bp) 172159307Spjd{ 173159307Spjd struct g_eli_softc *sc; 174159307Spjd struct cryptop *crp; 175159307Spjd struct cryptodesc *crd; 176159307Spjd struct uio *uio; 177159307Spjd struct iovec *iov; 178213063Spjd u_int i, nsec, secsize; 179159307Spjd int err, error; 180213063Spjd off_t dstoff; 181159307Spjd size_t size; 182159307Spjd u_char *p, *data; 183159307Spjd 184159307Spjd G_ELI_LOGREQ(3, bp, "%s", __func__); 185159307Spjd 186159307Spjd bp->bio_pflags = wr->w_number; 187159307Spjd sc = wr->w_softc; 188159307Spjd secsize = LIST_FIRST(&sc->sc_geom->provider)->sectorsize; 189159307Spjd nsec = bp->bio_length / secsize; 190159307Spjd 191159307Spjd /* 192159307Spjd * Calculate how much memory do we need. 193159307Spjd * We need separate crypto operation for every single sector. 194159307Spjd * It is much faster to calculate total amount of needed memory here and 195159307Spjd * do the allocation once instead of allocating memory in pieces (many, 196159307Spjd * many pieces). 197159307Spjd */ 198159307Spjd size = sizeof(*crp) * nsec; 199159307Spjd size += sizeof(*crd) * nsec; 200159307Spjd size += sizeof(*uio) * nsec; 201159307Spjd size += sizeof(*iov) * nsec; 202159307Spjd /* 203159307Spjd * If we write the data we cannot destroy current bio_data content, 204159307Spjd * so we need to allocate more memory for encrypted data. 205159307Spjd */ 206159307Spjd if (bp->bio_cmd == BIO_WRITE) 207159307Spjd size += bp->bio_length; 208159307Spjd p = malloc(size, M_ELI, M_WAITOK); 209159307Spjd 210159307Spjd bp->bio_inbed = 0; 211159307Spjd bp->bio_children = nsec; 212159307Spjd bp->bio_driver2 = p; 213159307Spjd 214159307Spjd if (bp->bio_cmd == BIO_READ) 215159307Spjd data = bp->bio_data; 216159307Spjd else { 217159307Spjd data = p; 218159307Spjd p += bp->bio_length; 219159307Spjd bcopy(bp->bio_data, data, bp->bio_length); 220159307Spjd } 221159307Spjd 222159307Spjd error = 0; 223213063Spjd for (i = 0, dstoff = bp->bio_offset; i < nsec; i++, dstoff += secsize) { 224159307Spjd crp = (struct cryptop *)p; p += sizeof(*crp); 225159307Spjd crd = (struct cryptodesc *)p; p += sizeof(*crd); 226159307Spjd uio = (struct uio *)p; p += sizeof(*uio); 227159307Spjd iov = (struct iovec *)p; p += sizeof(*iov); 228159307Spjd 229159307Spjd iov->iov_len = secsize; 230159307Spjd iov->iov_base = data; 231159307Spjd data += secsize; 232159307Spjd 233159307Spjd uio->uio_iov = iov; 234159307Spjd uio->uio_iovcnt = 1; 235159307Spjd uio->uio_segflg = UIO_SYSSPACE; 236159307Spjd uio->uio_resid = secsize; 237159307Spjd 238159307Spjd crp->crp_sid = wr->w_sid; 239159307Spjd crp->crp_ilen = secsize; 240159307Spjd crp->crp_olen = secsize; 241159307Spjd crp->crp_opaque = (void *)bp; 242159307Spjd crp->crp_buf = (void *)uio; 243159307Spjd if (bp->bio_cmd == BIO_WRITE) 244159307Spjd crp->crp_callback = g_eli_crypto_write_done; 245159307Spjd else /* if (bp->bio_cmd == BIO_READ) */ 246159307Spjd crp->crp_callback = g_eli_crypto_read_done; 247159307Spjd crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIFSYNC | CRYPTO_F_REL; 248159307Spjd if (g_eli_batch) 249159307Spjd crp->crp_flags |= CRYPTO_F_BATCH; 250159307Spjd crp->crp_desc = crd; 251159307Spjd 252159307Spjd crd->crd_skip = 0; 253159307Spjd crd->crd_len = secsize; 254159307Spjd crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT; 255159307Spjd if (bp->bio_cmd == BIO_WRITE) 256159307Spjd crd->crd_flags |= CRD_F_ENCRYPT; 257159307Spjd crd->crd_alg = sc->sc_ealgo; 258159307Spjd crd->crd_key = sc->sc_ekey; 259159307Spjd crd->crd_klen = sc->sc_ekeylen; 260213063Spjd g_eli_crypto_ivgen(sc, dstoff, crd->crd_iv, 261159307Spjd sizeof(crd->crd_iv)); 262159307Spjd crd->crd_next = NULL; 263159307Spjd 264159307Spjd crp->crp_etype = 0; 265159307Spjd err = crypto_dispatch(crp); 266159307Spjd if (error == 0) 267159307Spjd error = err; 268159307Spjd } 269159307Spjd if (bp->bio_error == 0) 270159307Spjd bp->bio_error = error; 271159307Spjd} 272