g_eli_privacy.c revision 214116
1263351Sjmmv/*- 2263351Sjmmv * Copyright (c) 2005-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3263351Sjmmv * All rights reserved. 4263351Sjmmv * 5263351Sjmmv * Redistribution and use in source and binary forms, with or without 6263351Sjmmv * modification, are permitted provided that the following conditions 7263351Sjmmv * are met: 8263351Sjmmv * 1. Redistributions of source code must retain the above copyright 9263351Sjmmv * notice, this list of conditions and the following disclaimer. 10263351Sjmmv * 2. Redistributions in binary form must reproduce the above copyright 11263351Sjmmv * notice, this list of conditions and the following disclaimer in the 12263351Sjmmv * documentation and/or other materials provided with the distribution. 13263351Sjmmv * 14263351Sjmmv * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15269977Sasomers * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16263351Sjmmv * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17263351Sjmmv * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18263351Sjmmv * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19263351Sjmmv * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20263351Sjmmv * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21263351Sjmmv * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22263351Sjmmv * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23263351Sjmmv * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24263351Sjmmv * SUCH DAMAGE. 25263351Sjmmv */ 26263351Sjmmv 27263351Sjmmv#include <sys/cdefs.h> 28263351Sjmmv__FBSDID("$FreeBSD: head/sys/geom/eli/g_eli_privacy.c 214116 2010-10-20 20:01:45Z pjd $"); 29263351Sjmmv 30263351Sjmmv#include <sys/param.h> 31263351Sjmmv#include <sys/systm.h> 32263351Sjmmv#include <sys/kernel.h> 33269977Sasomers#include <sys/linker.h> 34263351Sjmmv#include <sys/module.h> 35263351Sjmmv#include <sys/lock.h> 36263351Sjmmv#include <sys/mutex.h> 37263351Sjmmv#include <sys/bio.h> 38263351Sjmmv#include <sys/sysctl.h> 39#include <sys/malloc.h> 40#include <sys/kthread.h> 41#include <sys/proc.h> 42#include <sys/sched.h> 43#include <sys/smp.h> 44#include <sys/uio.h> 45#include <sys/vnode.h> 46 47#include <vm/uma.h> 48 49#include <geom/geom.h> 50#include <geom/eli/g_eli.h> 51#include <geom/eli/pkcs5v2.h> 52 53/* 54 * Code paths: 55 * BIO_READ: 56 * g_eli_start -> g_io_request -> g_eli_read_done -> g_eli_crypto_run -> g_eli_crypto_read_done -> g_io_deliver 57 * BIO_WRITE: 58 * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver 59 */ 60 61MALLOC_DECLARE(M_ELI); 62 63/* 64 * The function is called after we read and decrypt data. 65 * 66 * g_eli_start -> g_io_request -> g_eli_read_done -> g_eli_crypto_run -> G_ELI_CRYPTO_READ_DONE -> g_io_deliver 67 */ 68static int 69g_eli_crypto_read_done(struct cryptop *crp) 70{ 71 struct bio *bp; 72 73 if (crp->crp_etype == EAGAIN) { 74 if (g_eli_crypto_rerun(crp) == 0) 75 return (0); 76 } 77 bp = (struct bio *)crp->crp_opaque; 78 bp->bio_inbed++; 79 if (crp->crp_etype == 0) { 80 G_ELI_DEBUG(3, "Crypto READ request done (%d/%d).", 81 bp->bio_inbed, bp->bio_children); 82 bp->bio_completed += crp->crp_olen; 83 } else { 84 G_ELI_DEBUG(1, "Crypto READ request failed (%d/%d) error=%d.", 85 bp->bio_inbed, bp->bio_children, crp->crp_etype); 86 if (bp->bio_error == 0) 87 bp->bio_error = crp->crp_etype; 88 } 89 /* 90 * Do we have all sectors already? 91 */ 92 if (bp->bio_inbed < bp->bio_children) 93 return (0); 94 free(bp->bio_driver2, M_ELI); 95 bp->bio_driver2 = NULL; 96 if (bp->bio_error != 0) { 97 G_ELI_LOGREQ(0, bp, "Crypto READ request failed (error=%d).", 98 bp->bio_error); 99 bp->bio_completed = 0; 100 } 101 /* 102 * Read is finished, send it up. 103 */ 104 g_io_deliver(bp, bp->bio_error); 105 return (0); 106} 107 108/* 109 * The function is called after data encryption. 110 * 111 * g_eli_start -> g_eli_crypto_run -> G_ELI_CRYPTO_WRITE_DONE -> g_io_request -> g_eli_write_done -> g_io_deliver 112 */ 113static int 114g_eli_crypto_write_done(struct cryptop *crp) 115{ 116 struct g_geom *gp; 117 struct g_consumer *cp; 118 struct bio *bp, *cbp; 119 120 if (crp->crp_etype == EAGAIN) { 121 if (g_eli_crypto_rerun(crp) == 0) 122 return (0); 123 } 124 bp = (struct bio *)crp->crp_opaque; 125 bp->bio_inbed++; 126 if (crp->crp_etype == 0) { 127 G_ELI_DEBUG(3, "Crypto WRITE request done (%d/%d).", 128 bp->bio_inbed, bp->bio_children); 129 } else { 130 G_ELI_DEBUG(1, "Crypto WRITE request failed (%d/%d) error=%d.", 131 bp->bio_inbed, bp->bio_children, crp->crp_etype); 132 if (bp->bio_error == 0) 133 bp->bio_error = crp->crp_etype; 134 } 135 /* 136 * All sectors are already encrypted? 137 */ 138 if (bp->bio_inbed < bp->bio_children) 139 return (0); 140 bp->bio_inbed = 0; 141 bp->bio_children = 1; 142 cbp = bp->bio_driver1; 143 bp->bio_driver1 = NULL; 144 if (bp->bio_error != 0) { 145 G_ELI_LOGREQ(0, bp, "Crypto WRITE request failed (error=%d).", 146 bp->bio_error); 147 free(bp->bio_driver2, M_ELI); 148 bp->bio_driver2 = NULL; 149 g_destroy_bio(cbp); 150 g_io_deliver(bp, bp->bio_error); 151 return (0); 152 } 153 cbp->bio_data = bp->bio_driver2; 154 cbp->bio_done = g_eli_write_done; 155 gp = bp->bio_to->geom; 156 cp = LIST_FIRST(&gp->consumer); 157 cbp->bio_to = cp->provider; 158 G_ELI_LOGREQ(2, cbp, "Sending request."); 159 /* 160 * Send encrypted data to the provider. 161 */ 162 g_io_request(cbp, cp); 163 return (0); 164} 165 166/* 167 * This is the main function responsible for cryptography (ie. communication 168 * with crypto(9) subsystem). 169 * 170 * BIO_READ: 171 * g_eli_start -> g_io_request -> g_eli_read_done -> G_ELI_CRYPTO_RUN -> g_eli_crypto_read_done -> g_io_deliver 172 * BIO_WRITE: 173 * g_eli_start -> G_ELI_CRYPTO_RUN -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver 174 */ 175void 176g_eli_crypto_run(struct g_eli_worker *wr, struct bio *bp) 177{ 178 struct g_eli_softc *sc; 179 struct cryptop *crp; 180 struct cryptodesc *crd; 181 struct uio *uio; 182 struct iovec *iov; 183 u_int i, nsec, secsize; 184 int err, error; 185 off_t dstoff; 186 size_t size; 187 u_char *p, *data; 188 189 G_ELI_LOGREQ(3, bp, "%s", __func__); 190 191 bp->bio_pflags = wr->w_number; 192 sc = wr->w_softc; 193 secsize = LIST_FIRST(&sc->sc_geom->provider)->sectorsize; 194 nsec = bp->bio_length / secsize; 195 196 /* 197 * Calculate how much memory do we need. 198 * We need separate crypto operation for every single sector. 199 * It is much faster to calculate total amount of needed memory here and 200 * do the allocation once instead of allocating memory in pieces (many, 201 * many pieces). 202 */ 203 size = sizeof(*crp) * nsec; 204 size += sizeof(*crd) * nsec; 205 size += sizeof(*uio) * nsec; 206 size += sizeof(*iov) * nsec; 207 /* 208 * If we write the data we cannot destroy current bio_data content, 209 * so we need to allocate more memory for encrypted data. 210 */ 211 if (bp->bio_cmd == BIO_WRITE) 212 size += bp->bio_length; 213 p = malloc(size, M_ELI, M_WAITOK); 214 215 bp->bio_inbed = 0; 216 bp->bio_children = nsec; 217 bp->bio_driver2 = p; 218 219 if (bp->bio_cmd == BIO_READ) 220 data = bp->bio_data; 221 else { 222 data = p; 223 p += bp->bio_length; 224 bcopy(bp->bio_data, data, bp->bio_length); 225 } 226 227 error = 0; 228 for (i = 0, dstoff = bp->bio_offset; i < nsec; i++, dstoff += secsize) { 229 crp = (struct cryptop *)p; p += sizeof(*crp); 230 crd = (struct cryptodesc *)p; p += sizeof(*crd); 231 uio = (struct uio *)p; p += sizeof(*uio); 232 iov = (struct iovec *)p; p += sizeof(*iov); 233 234 iov->iov_len = secsize; 235 iov->iov_base = data; 236 data += secsize; 237 238 uio->uio_iov = iov; 239 uio->uio_iovcnt = 1; 240 uio->uio_segflg = UIO_SYSSPACE; 241 uio->uio_resid = secsize; 242 243 crp->crp_sid = wr->w_sid; 244 crp->crp_ilen = secsize; 245 crp->crp_olen = secsize; 246 crp->crp_opaque = (void *)bp; 247 crp->crp_buf = (void *)uio; 248 if (bp->bio_cmd == BIO_WRITE) 249 crp->crp_callback = g_eli_crypto_write_done; 250 else /* if (bp->bio_cmd == BIO_READ) */ 251 crp->crp_callback = g_eli_crypto_read_done; 252 crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIFSYNC | CRYPTO_F_REL; 253 if (g_eli_batch) 254 crp->crp_flags |= CRYPTO_F_BATCH; 255 crp->crp_desc = crd; 256 257 crd->crd_skip = 0; 258 crd->crd_len = secsize; 259 crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT; 260 if (sc->sc_nekeys > 1) 261 crd->crd_flags |= CRD_F_KEY_EXPLICIT; 262 if (bp->bio_cmd == BIO_WRITE) 263 crd->crd_flags |= CRD_F_ENCRYPT; 264 crd->crd_alg = sc->sc_ealgo; 265 crd->crd_key = g_eli_crypto_key(sc, dstoff, secsize); 266 crd->crd_klen = sc->sc_ekeylen; 267 if (sc->sc_ealgo == CRYPTO_AES_XTS) 268 crd->crd_klen <<= 1; 269 g_eli_crypto_ivgen(sc, dstoff, crd->crd_iv, 270 sizeof(crd->crd_iv)); 271 crd->crd_next = NULL; 272 273 crp->crp_etype = 0; 274 err = crypto_dispatch(crp); 275 if (error == 0) 276 error = err; 277 } 278 if (bp->bio_error == 0) 279 bp->bio_error = error; 280} 281