g_eli_privacy.c revision 339023
1/*- 2 * Copyright (c) 2005-2011 Pawel Jakub Dawidek <pawel@dawidek.net> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: stable/11/sys/geom/eli/g_eli_privacy.c 339023 2018-09-30 12:25:38Z oshogbo $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <sys/linker.h> 34#include <sys/module.h> 35#include <sys/lock.h> 36#include <sys/mutex.h> 37#include <sys/bio.h> 38#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/vnode.h> 45 46#include <vm/uma.h> 47 48#include <geom/geom.h> 49#include <geom/eli/g_eli.h> 50#include <geom/eli/pkcs5v2.h> 51 52/* 53 * Code paths: 54 * BIO_READ: 55 * 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 56 * BIO_WRITE: 57 * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver 58 */ 59 60MALLOC_DECLARE(M_ELI); 61 62/* 63 * The function is called after we read and decrypt data. 64 * 65 * 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 66 */ 67static int 68g_eli_crypto_read_done(struct cryptop *crp) 69{ 70 struct g_eli_softc *sc; 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 sc = bp->bio_to->geom->softc; 90 if (sc != NULL) 91 g_eli_key_drop(sc, crp->crp_desc->crd_key); 92 /* 93 * Do we have all sectors already? 94 */ 95 if (bp->bio_inbed < bp->bio_children) 96 return (0); 97 free(bp->bio_driver2, M_ELI); 98 bp->bio_driver2 = NULL; 99 if (bp->bio_error != 0) { 100 G_ELI_LOGREQ(0, bp, "Crypto READ request failed (error=%d).", 101 bp->bio_error); 102 bp->bio_completed = 0; 103 } 104 /* 105 * Read is finished, send it up. 106 */ 107 g_io_deliver(bp, bp->bio_error); 108 if (sc != NULL) 109 atomic_subtract_int(&sc->sc_inflight, 1); 110 return (0); 111} 112 113/* 114 * The function is called after data encryption. 115 * 116 * g_eli_start -> g_eli_crypto_run -> G_ELI_CRYPTO_WRITE_DONE -> g_io_request -> g_eli_write_done -> g_io_deliver 117 */ 118static int 119g_eli_crypto_write_done(struct cryptop *crp) 120{ 121 struct g_eli_softc *sc; 122 struct g_geom *gp; 123 struct g_consumer *cp; 124 struct bio *bp, *cbp; 125 126 if (crp->crp_etype == EAGAIN) { 127 if (g_eli_crypto_rerun(crp) == 0) 128 return (0); 129 } 130 bp = (struct bio *)crp->crp_opaque; 131 bp->bio_inbed++; 132 if (crp->crp_etype == 0) { 133 G_ELI_DEBUG(3, "Crypto WRITE request done (%d/%d).", 134 bp->bio_inbed, bp->bio_children); 135 } else { 136 G_ELI_DEBUG(1, "Crypto WRITE request failed (%d/%d) error=%d.", 137 bp->bio_inbed, bp->bio_children, crp->crp_etype); 138 if (bp->bio_error == 0) 139 bp->bio_error = crp->crp_etype; 140 } 141 gp = bp->bio_to->geom; 142 sc = gp->softc; 143 g_eli_key_drop(sc, crp->crp_desc->crd_key); 144 /* 145 * All sectors are already encrypted? 146 */ 147 if (bp->bio_inbed < bp->bio_children) 148 return (0); 149 bp->bio_inbed = 0; 150 bp->bio_children = 1; 151 cbp = bp->bio_driver1; 152 bp->bio_driver1 = NULL; 153 if (bp->bio_error != 0) { 154 G_ELI_LOGREQ(0, bp, "Crypto WRITE request failed (error=%d).", 155 bp->bio_error); 156 free(bp->bio_driver2, M_ELI); 157 bp->bio_driver2 = NULL; 158 g_destroy_bio(cbp); 159 g_io_deliver(bp, bp->bio_error); 160 atomic_subtract_int(&sc->sc_inflight, 1); 161 return (0); 162 } 163 cbp->bio_data = bp->bio_driver2; 164 cbp->bio_done = g_eli_write_done; 165 cp = LIST_FIRST(&gp->consumer); 166 cbp->bio_to = cp->provider; 167 G_ELI_LOGREQ(2, cbp, "Sending request."); 168 /* 169 * Send encrypted data to the provider. 170 */ 171 g_io_request(cbp, cp); 172 return (0); 173} 174 175/* 176 * The function is called to read encrypted data. 177 * 178 * 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 179 */ 180void 181g_eli_crypto_read(struct g_eli_softc *sc, struct bio *bp, boolean_t fromworker) 182{ 183 struct g_consumer *cp; 184 struct bio *cbp; 185 186 if (!fromworker) { 187 /* 188 * We are not called from the worker thread, so check if 189 * device is suspended. 190 */ 191 mtx_lock(&sc->sc_queue_mtx); 192 if (sc->sc_flags & G_ELI_FLAG_SUSPEND) { 193 /* 194 * If device is suspended, we place the request onto 195 * the queue, so it can be handled after resume. 196 */ 197 G_ELI_DEBUG(0, "device suspended, move onto queue"); 198 bioq_insert_tail(&sc->sc_queue, bp); 199 mtx_unlock(&sc->sc_queue_mtx); 200 wakeup(sc); 201 return; 202 } 203 atomic_add_int(&sc->sc_inflight, 1); 204 mtx_unlock(&sc->sc_queue_mtx); 205 } 206 bp->bio_pflags = 0; 207 bp->bio_driver2 = NULL; 208 cbp = bp->bio_driver1; 209 cbp->bio_done = g_eli_read_done; 210 cp = LIST_FIRST(&sc->sc_geom->consumer); 211 cbp->bio_to = cp->provider; 212 G_ELI_LOGREQ(2, cbp, "Sending request."); 213 /* 214 * Read encrypted data from provider. 215 */ 216 g_io_request(cbp, cp); 217} 218 219/* 220 * This is the main function responsible for cryptography (ie. communication 221 * with crypto(9) subsystem). 222 * 223 * BIO_READ: 224 * 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 225 * BIO_WRITE: 226 * g_eli_start -> G_ELI_CRYPTO_RUN -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver 227 */ 228void 229g_eli_crypto_run(struct g_eli_worker *wr, struct bio *bp) 230{ 231 struct g_eli_softc *sc; 232 struct cryptop *crp; 233 struct cryptodesc *crd; 234 u_int i, nsec, secsize; 235 off_t dstoff; 236 size_t size; 237 u_char *p, *data; 238 int error; 239 240 G_ELI_LOGREQ(3, bp, "%s", __func__); 241 242 bp->bio_pflags = wr->w_number; 243 sc = wr->w_softc; 244 secsize = LIST_FIRST(&sc->sc_geom->provider)->sectorsize; 245 nsec = bp->bio_length / secsize; 246 247 /* 248 * Calculate how much memory do we need. 249 * We need separate crypto operation for every single sector. 250 * It is much faster to calculate total amount of needed memory here and 251 * do the allocation once instead of allocating memory in pieces (many, 252 * many pieces). 253 */ 254 size = sizeof(*crp) * nsec; 255 size += sizeof(*crd) * nsec; 256 /* 257 * If we write the data we cannot destroy current bio_data content, 258 * so we need to allocate more memory for encrypted data. 259 */ 260 if (bp->bio_cmd == BIO_WRITE) 261 size += bp->bio_length; 262 p = malloc(size, M_ELI, M_WAITOK); 263 264 bp->bio_inbed = 0; 265 bp->bio_children = nsec; 266 bp->bio_driver2 = p; 267 268 if (bp->bio_cmd == BIO_READ) 269 data = bp->bio_data; 270 else { 271 data = p; 272 p += bp->bio_length; 273 bcopy(bp->bio_data, data, bp->bio_length); 274 } 275 276 for (i = 0, dstoff = bp->bio_offset; i < nsec; i++, dstoff += secsize) { 277 crp = (struct cryptop *)p; p += sizeof(*crp); 278 crd = (struct cryptodesc *)p; p += sizeof(*crd); 279 280 crp->crp_sid = wr->w_sid; 281 crp->crp_ilen = secsize; 282 crp->crp_olen = secsize; 283 crp->crp_opaque = (void *)bp; 284 crp->crp_buf = (void *)data; 285 data += secsize; 286 if (bp->bio_cmd == BIO_WRITE) 287 crp->crp_callback = g_eli_crypto_write_done; 288 else /* if (bp->bio_cmd == BIO_READ) */ 289 crp->crp_callback = g_eli_crypto_read_done; 290 crp->crp_flags = CRYPTO_F_CBIFSYNC; 291 if (g_eli_batch) 292 crp->crp_flags |= CRYPTO_F_BATCH; 293 crp->crp_desc = crd; 294 295 crd->crd_skip = 0; 296 crd->crd_len = secsize; 297 crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT; 298 if ((sc->sc_flags & G_ELI_FLAG_SINGLE_KEY) == 0) 299 crd->crd_flags |= CRD_F_KEY_EXPLICIT; 300 if (bp->bio_cmd == BIO_WRITE) 301 crd->crd_flags |= CRD_F_ENCRYPT; 302 crd->crd_alg = sc->sc_ealgo; 303 crd->crd_key = g_eli_key_hold(sc, dstoff, secsize); 304 crd->crd_klen = sc->sc_ekeylen; 305 if (sc->sc_ealgo == CRYPTO_AES_XTS) 306 crd->crd_klen <<= 1; 307 g_eli_crypto_ivgen(sc, dstoff, crd->crd_iv, 308 sizeof(crd->crd_iv)); 309 crd->crd_next = NULL; 310 311 crp->crp_etype = 0; 312 error = crypto_dispatch(crp); 313 KASSERT(error == 0, ("crypto_dispatch() failed (error=%d)", 314 error)); 315 } 316} 317