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staging/lustre/ptlrpc: Adjust comments to better conform to coding style
[deliverable/linux.git] / drivers / staging / lustre / lustre / ptlrpc / sec_plain.c
CommitLineData
d7e09d03
PT		 1/*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26/*
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
1dc563a6 30 * Copyright (c) 2011, 2015, Intel Corporation.
d7e09d03
PT		 31 */
32/*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 *
36 * lustre/ptlrpc/sec_plain.c
37 *
38 * Author: Eric Mei <ericm@clusterfs.com>
39 */
40
41#define DEBUG_SUBSYSTEM S_SEC
42
e27db149
GKH		 43#include "../include/obd_support.h"
44#include "../include/obd_cksum.h"
45#include "../include/obd_class.h"
46#include "../include/lustre_net.h"
47#include "../include/lustre_sec.h"
2ced12a7 48#include "ptlrpc_internal.h"
d7e09d03
PT		 49
50struct plain_sec {
51 struct ptlrpc_sec pls_base;
52 rwlock_t pls_lock;
53 struct ptlrpc_cli_ctx *pls_ctx;
54};
55
56static inline struct plain_sec *sec2plsec(struct ptlrpc_sec *sec)
57{
58 return container_of(sec, struct plain_sec, pls_base);
59}
60
61static struct ptlrpc_sec_policy plain_policy;
62static struct ptlrpc_ctx_ops plain_ctx_ops;
63static struct ptlrpc_svc_ctx plain_svc_ctx;
64
65static unsigned int plain_at_offset;
66
67/*
68 * for simplicity, plain policy rpc use fixed layout.
69 */
70#define PLAIN_PACK_SEGMENTS (4)
71
72#define PLAIN_PACK_HDR_OFF (0)
73#define PLAIN_PACK_MSG_OFF (1)
74#define PLAIN_PACK_USER_OFF (2)
75#define PLAIN_PACK_BULK_OFF (3)
76
77#define PLAIN_FL_USER (0x01)
78#define PLAIN_FL_BULK (0x02)
79
80struct plain_header {
81 __u8 ph_ver; /* 0 */
82 __u8 ph_flags;
83 __u8 ph_sp; /* source */
84 __u8 ph_bulk_hash_alg; /* complete flavor desc */
85 __u8 ph_pad[4];
86};
87
88struct plain_bulk_token {
89 __u8 pbt_hash[8];
90};
91
92#define PLAIN_BSD_SIZE \
93 (sizeof(struct ptlrpc_bulk_sec_desc) + sizeof(struct plain_bulk_token))
94
95/****************************************
96 * bulk checksum helpers *
97 ****************************************/
98
99static int plain_unpack_bsd(struct lustre_msg *msg, int swabbed)
100{
101 struct ptlrpc_bulk_sec_desc *bsd;
102
103 if (bulk_sec_desc_unpack(msg, PLAIN_PACK_BULK_OFF, swabbed))
104 return -EPROTO;
105
106 bsd = lustre_msg_buf(msg, PLAIN_PACK_BULK_OFF, PLAIN_BSD_SIZE);
8b382089 107 if (!bsd) {
d7e09d03
PT		 108 CERROR("bulk sec desc has short size %d\n",
109 lustre_msg_buflen(msg, PLAIN_PACK_BULK_OFF));
110 return -EPROTO;
111 }
112
113 if (bsd->bsd_svc != SPTLRPC_BULK_SVC_NULL &&
114 bsd->bsd_svc != SPTLRPC_BULK_SVC_INTG) {
115 CERROR("invalid bulk svc %u\n", bsd->bsd_svc);
116 return -EPROTO;
117 }
118
119 return 0;
120}
121
122static int plain_generate_bulk_csum(struct ptlrpc_bulk_desc *desc,
123 __u8 hash_alg,
124 struct plain_bulk_token *token)
125{
126 if (hash_alg == BULK_HASH_ALG_NULL)
127 return 0;
128
129 memset(token->pbt_hash, 0, sizeof(token->pbt_hash));
130 return sptlrpc_get_bulk_checksum(desc, hash_alg, token->pbt_hash,
131 sizeof(token->pbt_hash));
132}
133
134static int plain_verify_bulk_csum(struct ptlrpc_bulk_desc *desc,
135 __u8 hash_alg,
136 struct plain_bulk_token *tokenr)
137{
138 struct plain_bulk_token tokenv;
d0bfef31 139 int rc;
d7e09d03
PT		 140
141 if (hash_alg == BULK_HASH_ALG_NULL)
142 return 0;
143
144 memset(&tokenv.pbt_hash, 0, sizeof(tokenv.pbt_hash));
145 rc = sptlrpc_get_bulk_checksum(desc, hash_alg, tokenv.pbt_hash,
146 sizeof(tokenv.pbt_hash));
147 if (rc)
148 return rc;
149
150 if (memcmp(tokenr->pbt_hash, tokenv.pbt_hash, sizeof(tokenr->pbt_hash)))
151 return -EACCES;
152 return 0;
153}
154
155static void corrupt_bulk_data(struct ptlrpc_bulk_desc *desc)
156{
d0bfef31
CH		 157 char *ptr;
158 unsigned int off, i;
d7e09d03
PT		 159
160 for (i = 0; i < desc->bd_iov_count; i++) {
161 if (desc->bd_iov[i].kiov_len == 0)
162 continue;
163
164 ptr = kmap(desc->bd_iov[i].kiov_page);
165 off = desc->bd_iov[i].kiov_offset & ~CFS_PAGE_MASK;
166 ptr[off] ^= 0x1;
167 kunmap(desc->bd_iov[i].kiov_page);
168 return;
169 }
170}
171
172/****************************************
173 * cli_ctx apis *
174 ****************************************/
175
176static
177int plain_ctx_refresh(struct ptlrpc_cli_ctx *ctx)
178{
179 /* should never reach here */
180 LBUG();
181 return 0;
182}
183
184static
185int plain_ctx_validate(struct ptlrpc_cli_ctx *ctx)
186{
187 return 0;
188}
189
190static
191int plain_ctx_sign(struct ptlrpc_cli_ctx *ctx, struct ptlrpc_request *req)
192{
d0bfef31 193 struct lustre_msg *msg = req->rq_reqbuf;
d7e09d03 194 struct plain_header *phdr;
d7e09d03
PT		 195
196 msg->lm_secflvr = req->rq_flvr.sf_rpc;
197
198 phdr = lustre_msg_buf(msg, PLAIN_PACK_HDR_OFF, 0);
199 phdr->ph_ver = 0;
200 phdr->ph_flags = 0;
201 phdr->ph_sp = ctx->cc_sec->ps_part;
202 phdr->ph_bulk_hash_alg = req->rq_flvr.u_bulk.hash.hash_alg;
203
204 if (req->rq_pack_udesc)
205 phdr->ph_flags |= PLAIN_FL_USER;
206 if (req->rq_pack_bulk)
207 phdr->ph_flags |= PLAIN_FL_BULK;
208
209 req->rq_reqdata_len = lustre_msg_size_v2(msg->lm_bufcount,
210 msg->lm_buflens);
0a3bdb00 211 return 0;
d7e09d03
PT		 212}
213
214static
215int plain_ctx_verify(struct ptlrpc_cli_ctx *ctx, struct ptlrpc_request *req)
216{
d0bfef31 217 struct lustre_msg *msg = req->rq_repdata;
d7e09d03 218 struct plain_header *phdr;
d0bfef31
CH		 219 __u32 cksum;
220 int swabbed;
d7e09d03
PT		 221
222 if (msg->lm_bufcount != PLAIN_PACK_SEGMENTS) {
223 CERROR("unexpected reply buf count %u\n", msg->lm_bufcount);
0a3bdb00 224 return -EPROTO;
d7e09d03
PT		 225 }
226
227 swabbed = ptlrpc_rep_need_swab(req);
228
229 phdr = lustre_msg_buf(msg, PLAIN_PACK_HDR_OFF, sizeof(*phdr));
8b382089 230 if (!phdr) {
d7e09d03 231 CERROR("missing plain header\n");
0a3bdb00 232 return -EPROTO;
d7e09d03
PT		 233 }
234
235 if (phdr->ph_ver != 0) {
236 CERROR("Invalid header version\n");
0a3bdb00 237 return -EPROTO;
d7e09d03
PT		 238 }
239
240 /* expect no user desc in reply */
241 if (phdr->ph_flags & PLAIN_FL_USER) {
242 CERROR("Unexpected udesc flag in reply\n");
0a3bdb00 243 return -EPROTO;
d7e09d03
PT		 244 }
245
246 if (phdr->ph_bulk_hash_alg != req->rq_flvr.u_bulk.hash.hash_alg) {
247 CERROR("reply bulk flavor %u != %u\n", phdr->ph_bulk_hash_alg,
248 req->rq_flvr.u_bulk.hash.hash_alg);
0a3bdb00 249 return -EPROTO;
d7e09d03
PT		 250 }
251
252 if (unlikely(req->rq_early)) {
253 unsigned int hsize = 4;
254
255 cfs_crypto_hash_digest(CFS_HASH_ALG_CRC32,
256 lustre_msg_buf(msg, PLAIN_PACK_MSG_OFF, 0),
257 lustre_msg_buflen(msg, PLAIN_PACK_MSG_OFF),
258 NULL, 0, (unsigned char *)&cksum, &hsize);
259 if (cksum != msg->lm_cksum) {
260 CDEBUG(D_SEC,
261 "early reply checksum mismatch: %08x != %08x\n",
262 cpu_to_le32(cksum), msg->lm_cksum);
0a3bdb00 263 return -EINVAL;
d7e09d03
PT		 264 }
265 } else {
266 /* whether we sent with bulk or not, we expect the same
dadfcdab
OD		 267 * in reply, except for early reply
268 */
d7e09d03
PT		 269 if (!req->rq_early &&
270 !equi(req->rq_pack_bulk == 1,
271 phdr->ph_flags & PLAIN_FL_BULK)) {
272 CERROR("%s bulk checksum in reply\n",
273 req->rq_pack_bulk ? "Missing" : "Unexpected");
0a3bdb00 274 return -EPROTO;
d7e09d03
PT		 275 }
276
277 if (phdr->ph_flags & PLAIN_FL_BULK) {
278 if (plain_unpack_bsd(msg, swabbed))
0a3bdb00 279 return -EPROTO;
d7e09d03
PT		 280 }
281 }
282
283 req->rq_repmsg = lustre_msg_buf(msg, PLAIN_PACK_MSG_OFF, 0);
284 req->rq_replen = lustre_msg_buflen(msg, PLAIN_PACK_MSG_OFF);
0a3bdb00 285 return 0;
d7e09d03
PT		 286}
287
288static
289int plain_cli_wrap_bulk(struct ptlrpc_cli_ctx *ctx,
290 struct ptlrpc_request *req,
291 struct ptlrpc_bulk_desc *desc)
292{
293 struct ptlrpc_bulk_sec_desc *bsd;
d0bfef31
CH		 294 struct plain_bulk_token *token;
295 int rc;
d7e09d03
PT		 296
297 LASSERT(req->rq_pack_bulk);
298 LASSERT(req->rq_reqbuf->lm_bufcount == PLAIN_PACK_SEGMENTS);
299
300 bsd = lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_BULK_OFF, 0);
301 token = (struct plain_bulk_token *) bsd->bsd_data;
302
303 bsd->bsd_version = 0;
304 bsd->bsd_flags = 0;
305 bsd->bsd_type = SPTLRPC_BULK_DEFAULT;
306 bsd->bsd_svc = SPTLRPC_FLVR_BULK_SVC(req->rq_flvr.sf_rpc);
307
308 if (bsd->bsd_svc == SPTLRPC_BULK_SVC_NULL)
0a3bdb00 309 return 0;
d7e09d03
PT		 310
311 if (req->rq_bulk_read)
0a3bdb00 312 return 0;
d7e09d03
PT		 313
314 rc = plain_generate_bulk_csum(desc, req->rq_flvr.u_bulk.hash.hash_alg,
315 token);
316 if (rc) {
317 CERROR("bulk write: failed to compute checksum: %d\n", rc);
318 } else {
319 /*
320 * for sending we only compute the wrong checksum instead
321 * of corrupting the data so it is still correct on a redo
322 */
323 if (OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_SEND) &&
324 req->rq_flvr.u_bulk.hash.hash_alg != BULK_HASH_ALG_NULL)
325 token->pbt_hash[0] ^= 0x1;
326 }
327
328 return rc;
329}
330
331static
332int plain_cli_unwrap_bulk(struct ptlrpc_cli_ctx *ctx,
333 struct ptlrpc_request *req,
334 struct ptlrpc_bulk_desc *desc)
335{
336 struct ptlrpc_bulk_sec_desc *bsdv;
d0bfef31
CH		 337 struct plain_bulk_token *tokenv;
338 int rc;
339 int i, nob;
d7e09d03
PT		 340
341 LASSERT(req->rq_pack_bulk);
342 LASSERT(req->rq_reqbuf->lm_bufcount == PLAIN_PACK_SEGMENTS);
343 LASSERT(req->rq_repdata->lm_bufcount == PLAIN_PACK_SEGMENTS);
344
345 bsdv = lustre_msg_buf(req->rq_repdata, PLAIN_PACK_BULK_OFF, 0);
346 tokenv = (struct plain_bulk_token *) bsdv->bsd_data;
347
348 if (req->rq_bulk_write) {
349 if (bsdv->bsd_flags & BSD_FL_ERR)
350 return -EIO;
351 return 0;
352 }
353
354 /* fix the actual data size */
355 for (i = 0, nob = 0; i < desc->bd_iov_count; i++) {
356 if (desc->bd_iov[i].kiov_len + nob > desc->bd_nob_transferred) {
357 desc->bd_iov[i].kiov_len =
358 desc->bd_nob_transferred - nob;
359 }
360 nob += desc->bd_iov[i].kiov_len;
361 }
362
363 rc = plain_verify_bulk_csum(desc, req->rq_flvr.u_bulk.hash.hash_alg,
364 tokenv);
365 if (rc)
366 CERROR("bulk read: client verify failed: %d\n", rc);
367
368 return rc;
369}
370
371/****************************************
372 * sec apis *
373 ****************************************/
374
375static
376struct ptlrpc_cli_ctx *plain_sec_install_ctx(struct plain_sec *plsec)
377{
d0bfef31 378 struct ptlrpc_cli_ctx *ctx, *ctx_new;
d7e09d03 379
9ae10597 380 ctx_new = kzalloc(sizeof(*ctx_new), GFP_NOFS);
d7e09d03
PT		 381
382 write_lock(&plsec->pls_lock);
383
384 ctx = plsec->pls_ctx;
385 if (ctx) {
386 atomic_inc(&ctx->cc_refcount);
387
76372381 388 kfree(ctx_new);
d7e09d03
PT		 389 } else if (ctx_new) {
390 ctx = ctx_new;
391
392 atomic_set(&ctx->cc_refcount, 1); /* for cache */
393 ctx->cc_sec = &plsec->pls_base;
394 ctx->cc_ops = &plain_ctx_ops;
395 ctx->cc_expire = 0;
396 ctx->cc_flags = PTLRPC_CTX_CACHED | PTLRPC_CTX_UPTODATE;
397 ctx->cc_vcred.vc_uid = 0;
398 spin_lock_init(&ctx->cc_lock);
399 INIT_LIST_HEAD(&ctx->cc_req_list);
400 INIT_LIST_HEAD(&ctx->cc_gc_chain);
401
402 plsec->pls_ctx = ctx;
403 atomic_inc(&plsec->pls_base.ps_nctx);
404 atomic_inc(&plsec->pls_base.ps_refcount);
405
406 atomic_inc(&ctx->cc_refcount); /* for caller */
407 }
408
409 write_unlock(&plsec->pls_lock);
410
411 return ctx;
412}
413
414static
415void plain_destroy_sec(struct ptlrpc_sec *sec)
416{
d0bfef31 417 struct plain_sec *plsec = sec2plsec(sec);
d7e09d03
PT		 418
419 LASSERT(sec->ps_policy == &plain_policy);
420 LASSERT(sec->ps_import);
421 LASSERT(atomic_read(&sec->ps_refcount) == 0);
422 LASSERT(atomic_read(&sec->ps_nctx) == 0);
8b382089 423 LASSERT(!plsec->pls_ctx);
d7e09d03
PT		 424
425 class_import_put(sec->ps_import);
426
9ae10597 427 kfree(plsec);
d7e09d03
PT		 428}
429
430static
431void plain_kill_sec(struct ptlrpc_sec *sec)
432{
433 sec->ps_dying = 1;
434}
435
436static
437struct ptlrpc_sec *plain_create_sec(struct obd_import *imp,
438 struct ptlrpc_svc_ctx *svc_ctx,
439 struct sptlrpc_flavor *sf)
440{
d0bfef31
CH		 441 struct plain_sec *plsec;
442 struct ptlrpc_sec *sec;
443 struct ptlrpc_cli_ctx *ctx;
d7e09d03
PT		 444
445 LASSERT(SPTLRPC_FLVR_POLICY(sf->sf_rpc) == SPTLRPC_POLICY_PLAIN);
446
9ae10597 447 plsec = kzalloc(sizeof(*plsec), GFP_NOFS);
597851ac 448 if (!plsec)
0a3bdb00 449 return NULL;
d7e09d03
PT		 450
451 /*
452 * initialize plain_sec
453 */
454 rwlock_init(&plsec->pls_lock);
455 plsec->pls_ctx = NULL;
456
457 sec = &plsec->pls_base;
458 sec->ps_policy = &plain_policy;
459 atomic_set(&sec->ps_refcount, 0);
460 atomic_set(&sec->ps_nctx, 0);
461 sec->ps_id = sptlrpc_get_next_secid();
462 sec->ps_import = class_import_get(imp);
463 sec->ps_flvr = *sf;
464 spin_lock_init(&sec->ps_lock);
465 INIT_LIST_HEAD(&sec->ps_gc_list);
466 sec->ps_gc_interval = 0;
467 sec->ps_gc_next = 0;
468
469 /* install ctx immediately if this is a reverse sec */
470 if (svc_ctx) {
471 ctx = plain_sec_install_ctx(plsec);
8b382089 472 if (!ctx) {
d7e09d03 473 plain_destroy_sec(sec);
0a3bdb00 474 return NULL;
d7e09d03
PT		 475 }
476 sptlrpc_cli_ctx_put(ctx, 1);
477 }
478
0a3bdb00 479 return sec;
d7e09d03
PT		 480}
481
482static
483struct ptlrpc_cli_ctx *plain_lookup_ctx(struct ptlrpc_sec *sec,
484 struct vfs_cred *vcred,
485 int create, int remove_dead)
486{
d0bfef31
CH		 487 struct plain_sec *plsec = sec2plsec(sec);
488 struct ptlrpc_cli_ctx *ctx;
d7e09d03
PT		 489
490 read_lock(&plsec->pls_lock);
491 ctx = plsec->pls_ctx;
492 if (ctx)
493 atomic_inc(&ctx->cc_refcount);
494 read_unlock(&plsec->pls_lock);
495
8b382089 496 if (unlikely(!ctx))
d7e09d03
PT		 497 ctx = plain_sec_install_ctx(plsec);
498
0a3bdb00 499 return ctx;
d7e09d03
PT		 500}
501
502static
503void plain_release_ctx(struct ptlrpc_sec *sec,
504 struct ptlrpc_cli_ctx *ctx, int sync)
505{
506 LASSERT(atomic_read(&sec->ps_refcount) > 0);
507 LASSERT(atomic_read(&sec->ps_nctx) > 0);
508 LASSERT(atomic_read(&ctx->cc_refcount) == 0);
509 LASSERT(ctx->cc_sec == sec);
510
9ae10597 511 kfree(ctx);
d7e09d03
PT		 512
513 atomic_dec(&sec->ps_nctx);
514 sptlrpc_sec_put(sec);
515}
516
517static
518int plain_flush_ctx_cache(struct ptlrpc_sec *sec,
519 uid_t uid, int grace, int force)
520{
d0bfef31
CH		 521 struct plain_sec *plsec = sec2plsec(sec);
522 struct ptlrpc_cli_ctx *ctx;
d7e09d03
PT		 523
524 /* do nothing unless caller want to flush for 'all' */
525 if (uid != -1)
0a3bdb00 526 return 0;
d7e09d03
PT		 527
528 write_lock(&plsec->pls_lock);
529 ctx = plsec->pls_ctx;
530 plsec->pls_ctx = NULL;
531 write_unlock(&plsec->pls_lock);
532
533 if (ctx)
534 sptlrpc_cli_ctx_put(ctx, 1);
0a3bdb00 535 return 0;
d7e09d03
PT		 536}
537
538static
539int plain_alloc_reqbuf(struct ptlrpc_sec *sec,
540 struct ptlrpc_request *req,
541 int msgsize)
542{
543 __u32 buflens[PLAIN_PACK_SEGMENTS] = { 0, };
d0bfef31 544 int alloc_len;
d7e09d03
PT		 545
546 buflens[PLAIN_PACK_HDR_OFF] = sizeof(struct plain_header);
547 buflens[PLAIN_PACK_MSG_OFF] = msgsize;
548
549 if (req->rq_pack_udesc)
550 buflens[PLAIN_PACK_USER_OFF] = sptlrpc_current_user_desc_size();
551
552 if (req->rq_pack_bulk) {
553 LASSERT(req->rq_bulk_read || req->rq_bulk_write);
554 buflens[PLAIN_PACK_BULK_OFF] = PLAIN_BSD_SIZE;
555 }
556
557 alloc_len = lustre_msg_size_v2(PLAIN_PACK_SEGMENTS, buflens);
558
559 if (!req->rq_reqbuf) {
560 LASSERT(!req->rq_pool);
561
562 alloc_len = size_roundup_power2(alloc_len);
ee0ec194 563 req->rq_reqbuf = libcfs_kvzalloc(alloc_len, GFP_NOFS);
d7e09d03 564 if (!req->rq_reqbuf)
0a3bdb00 565 return -ENOMEM;
d7e09d03
PT		 566
567 req->rq_reqbuf_len = alloc_len;
568 } else {
569 LASSERT(req->rq_pool);
570 LASSERT(req->rq_reqbuf_len >= alloc_len);
571 memset(req->rq_reqbuf, 0, alloc_len);
572 }
573
574 lustre_init_msg_v2(req->rq_reqbuf, PLAIN_PACK_SEGMENTS, buflens, NULL);
575 req->rq_reqmsg = lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_MSG_OFF, 0);
576
577 if (req->rq_pack_udesc)
578 sptlrpc_pack_user_desc(req->rq_reqbuf, PLAIN_PACK_USER_OFF);
579
0a3bdb00 580 return 0;
d7e09d03
PT		 581}
582
583static
584void plain_free_reqbuf(struct ptlrpc_sec *sec,
585 struct ptlrpc_request *req)
586{
d7e09d03 587 if (!req->rq_pool) {
ee0ec194 588 kvfree(req->rq_reqbuf);
d7e09d03
PT		 589 req->rq_reqbuf = NULL;
590 req->rq_reqbuf_len = 0;
591 }
d7e09d03
PT		 592}
593
594static
595int plain_alloc_repbuf(struct ptlrpc_sec *sec,
596 struct ptlrpc_request *req,
597 int msgsize)
598{
599 __u32 buflens[PLAIN_PACK_SEGMENTS] = { 0, };
600 int alloc_len;
d7e09d03
PT		 601
602 buflens[PLAIN_PACK_HDR_OFF] = sizeof(struct plain_header);
603 buflens[PLAIN_PACK_MSG_OFF] = msgsize;
604
605 if (req->rq_pack_bulk) {
606 LASSERT(req->rq_bulk_read || req->rq_bulk_write);
607 buflens[PLAIN_PACK_BULK_OFF] = PLAIN_BSD_SIZE;
608 }
609
610 alloc_len = lustre_msg_size_v2(PLAIN_PACK_SEGMENTS, buflens);
611
612 /* add space for early reply */
613 alloc_len += plain_at_offset;
614
615 alloc_len = size_roundup_power2(alloc_len);
616
ee0ec194 617 req->rq_repbuf = libcfs_kvzalloc(alloc_len, GFP_NOFS);
d7e09d03 618 if (!req->rq_repbuf)
0a3bdb00 619 return -ENOMEM;
d7e09d03
PT		 620
621 req->rq_repbuf_len = alloc_len;
0a3bdb00 622 return 0;
d7e09d03
PT		 623}
624
625static
626void plain_free_repbuf(struct ptlrpc_sec *sec,
627 struct ptlrpc_request *req)
628{
ee0ec194 629 kvfree(req->rq_repbuf);
d7e09d03
PT		 630 req->rq_repbuf = NULL;
631 req->rq_repbuf_len = 0;
d7e09d03
PT		 632}
633
634static
635int plain_enlarge_reqbuf(struct ptlrpc_sec *sec,
636 struct ptlrpc_request *req,
637 int segment, int newsize)
638{
d0bfef31
CH		 639 struct lustre_msg *newbuf;
640 int oldsize;
641 int newmsg_size, newbuf_size;
d7e09d03
PT		 642
643 LASSERT(req->rq_reqbuf);
644 LASSERT(req->rq_reqbuf_len >= req->rq_reqlen);
645 LASSERT(lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_MSG_OFF, 0) ==
646 req->rq_reqmsg);
647
648 /* compute new embedded msg size. */
649 oldsize = req->rq_reqmsg->lm_buflens[segment];
650 req->rq_reqmsg->lm_buflens[segment] = newsize;
651 newmsg_size = lustre_msg_size_v2(req->rq_reqmsg->lm_bufcount,
652 req->rq_reqmsg->lm_buflens);
653 req->rq_reqmsg->lm_buflens[segment] = oldsize;
654
655 /* compute new wrapper msg size. */
656 oldsize = req->rq_reqbuf->lm_buflens[PLAIN_PACK_MSG_OFF];
657 req->rq_reqbuf->lm_buflens[PLAIN_PACK_MSG_OFF] = newmsg_size;
658 newbuf_size = lustre_msg_size_v2(req->rq_reqbuf->lm_bufcount,
659 req->rq_reqbuf->lm_buflens);
660 req->rq_reqbuf->lm_buflens[PLAIN_PACK_MSG_OFF] = oldsize;
661
662 /* request from pool should always have enough buffer */
663 LASSERT(!req->rq_pool || req->rq_reqbuf_len >= newbuf_size);
664
665 if (req->rq_reqbuf_len < newbuf_size) {
666 newbuf_size = size_roundup_power2(newbuf_size);
667
ee0ec194 668 newbuf = libcfs_kvzalloc(newbuf_size, GFP_NOFS);
8b382089 669 if (!newbuf)
0a3bdb00 670 return -ENOMEM;
d7e09d03 671
61d7258b
OD		 672 /* Must lock this, so that otherwise unprotected change of
673 * rq_reqmsg is not racing with parallel processing of
674 * imp_replay_list traversing threads. See LU-3333
675 * This is a bandaid at best, we really need to deal with this
676 * in request enlarging code before unpacking that's already
dadfcdab
OD		 677 * there
678 */
61d7258b
OD		 679 if (req->rq_import)
680 spin_lock(&req->rq_import->imp_lock);
681
d7e09d03
PT		 682 memcpy(newbuf, req->rq_reqbuf, req->rq_reqbuf_len);
683
ee0ec194 684 kvfree(req->rq_reqbuf);
d7e09d03
PT		 685 req->rq_reqbuf = newbuf;
686 req->rq_reqbuf_len = newbuf_size;
687 req->rq_reqmsg = lustre_msg_buf(req->rq_reqbuf,
688 PLAIN_PACK_MSG_OFF, 0);
61d7258b
OD		 689
690 if (req->rq_import)
691 spin_unlock(&req->rq_import->imp_lock);
d7e09d03
PT		 692 }
693
694 _sptlrpc_enlarge_msg_inplace(req->rq_reqbuf, PLAIN_PACK_MSG_OFF,
695 newmsg_size);
696 _sptlrpc_enlarge_msg_inplace(req->rq_reqmsg, segment, newsize);
697
698 req->rq_reqlen = newmsg_size;
0a3bdb00 699 return 0;
d7e09d03
PT		 700}
701
702/****************************************
703 * service apis *
704 ****************************************/
705
706static struct ptlrpc_svc_ctx plain_svc_ctx = {
707 .sc_refcount = ATOMIC_INIT(1),
708 .sc_policy = &plain_policy,
709};
710
711static
712int plain_accept(struct ptlrpc_request *req)
713{
d0bfef31 714 struct lustre_msg *msg = req->rq_reqbuf;
d7e09d03 715 struct plain_header *phdr;
d0bfef31 716 int swabbed;
d7e09d03
PT		 717
718 LASSERT(SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) ==
719 SPTLRPC_POLICY_PLAIN);
720
721 if (SPTLRPC_FLVR_BASE(req->rq_flvr.sf_rpc) !=
722 SPTLRPC_FLVR_BASE(SPTLRPC_FLVR_PLAIN) ||
723 SPTLRPC_FLVR_BULK_TYPE(req->rq_flvr.sf_rpc) !=
724 SPTLRPC_FLVR_BULK_TYPE(SPTLRPC_FLVR_PLAIN)) {
725 CERROR("Invalid rpc flavor %x\n", req->rq_flvr.sf_rpc);
0a3bdb00 726 return SECSVC_DROP;
d7e09d03
PT		 727 }
728
729 if (msg->lm_bufcount < PLAIN_PACK_SEGMENTS) {
730 CERROR("unexpected request buf count %u\n", msg->lm_bufcount);
0a3bdb00 731 return SECSVC_DROP;
d7e09d03
PT		 732 }
733
734 swabbed = ptlrpc_req_need_swab(req);
735
736 phdr = lustre_msg_buf(msg, PLAIN_PACK_HDR_OFF, sizeof(*phdr));
8b382089 737 if (!phdr) {
d7e09d03 738 CERROR("missing plain header\n");
0a3bdb00 739 return -EPROTO;
d7e09d03
PT		 740 }
741
742 if (phdr->ph_ver != 0) {
743 CERROR("Invalid header version\n");
0a3bdb00 744 return -EPROTO;
d7e09d03
PT		 745 }
746
747 if (phdr->ph_bulk_hash_alg >= BULK_HASH_ALG_MAX) {
748 CERROR("invalid hash algorithm: %u\n", phdr->ph_bulk_hash_alg);
0a3bdb00 749 return -EPROTO;
d7e09d03
PT		 750 }
751
752 req->rq_sp_from = phdr->ph_sp;
753 req->rq_flvr.u_bulk.hash.hash_alg = phdr->ph_bulk_hash_alg;
754
755 if (phdr->ph_flags & PLAIN_FL_USER) {
756 if (sptlrpc_unpack_user_desc(msg, PLAIN_PACK_USER_OFF,
757 swabbed)) {
758 CERROR("Mal-formed user descriptor\n");
0a3bdb00 759 return SECSVC_DROP;
d7e09d03
PT		 760 }
761
762 req->rq_pack_udesc = 1;
763 req->rq_user_desc = lustre_msg_buf(msg, PLAIN_PACK_USER_OFF, 0);
764 }
765
766 if (phdr->ph_flags & PLAIN_FL_BULK) {
767 if (plain_unpack_bsd(msg, swabbed))
0a3bdb00 768 return SECSVC_DROP;
d7e09d03
PT		 769
770 req->rq_pack_bulk = 1;
771 }
772
773 req->rq_reqmsg = lustre_msg_buf(msg, PLAIN_PACK_MSG_OFF, 0);
774 req->rq_reqlen = msg->lm_buflens[PLAIN_PACK_MSG_OFF];
775
776 req->rq_svc_ctx = &plain_svc_ctx;
777 atomic_inc(&req->rq_svc_ctx->sc_refcount);
778
0a3bdb00 779 return SECSVC_OK;
d7e09d03
PT		 780}
781
782static
783int plain_alloc_rs(struct ptlrpc_request *req, int msgsize)
784{
d0bfef31
CH		 785 struct ptlrpc_reply_state *rs;
786 __u32 buflens[PLAIN_PACK_SEGMENTS] = { 0, };
787 int rs_size = sizeof(*rs);
d7e09d03
PT		 788
789 LASSERT(msgsize % 8 == 0);
790
791 buflens[PLAIN_PACK_HDR_OFF] = sizeof(struct plain_header);
792 buflens[PLAIN_PACK_MSG_OFF] = msgsize;
793
794 if (req->rq_pack_bulk && (req->rq_bulk_read || req->rq_bulk_write))
795 buflens[PLAIN_PACK_BULK_OFF] = PLAIN_BSD_SIZE;
796
797 rs_size += lustre_msg_size_v2(PLAIN_PACK_SEGMENTS, buflens);
798
799 rs = req->rq_reply_state;
800
801 if (rs) {
802 /* pre-allocated */
803 LASSERT(rs->rs_size >= rs_size);
804 } else {
ee0ec194 805 rs = libcfs_kvzalloc(rs_size, GFP_NOFS);
8b382089 806 if (!rs)
0a3bdb00 807 return -ENOMEM;
d7e09d03
PT		 808
809 rs->rs_size = rs_size;
810 }
811
812 rs->rs_svc_ctx = req->rq_svc_ctx;
813 atomic_inc(&req->rq_svc_ctx->sc_refcount);
814 rs->rs_repbuf = (struct lustre_msg *) (rs + 1);
815 rs->rs_repbuf_len = rs_size - sizeof(*rs);
816
817 lustre_init_msg_v2(rs->rs_repbuf, PLAIN_PACK_SEGMENTS, buflens, NULL);
818 rs->rs_msg = lustre_msg_buf_v2(rs->rs_repbuf, PLAIN_PACK_MSG_OFF, 0);
819
820 req->rq_reply_state = rs;
0a3bdb00 821 return 0;
d7e09d03
PT		 822}
823
824static
825void plain_free_rs(struct ptlrpc_reply_state *rs)
826{
d7e09d03
PT		 827 LASSERT(atomic_read(&rs->rs_svc_ctx->sc_refcount) > 1);
828 atomic_dec(&rs->rs_svc_ctx->sc_refcount);
829
830 if (!rs->rs_prealloc)
ee0ec194 831 kvfree(rs);
d7e09d03
PT		 832}
833
834static
835int plain_authorize(struct ptlrpc_request *req)
836{
837 struct ptlrpc_reply_state *rs = req->rq_reply_state;
d0bfef31
CH		 838 struct lustre_msg_v2 *msg = rs->rs_repbuf;
839 struct plain_header *phdr;
840 int len;
d7e09d03
PT		 841
842 LASSERT(rs);
843 LASSERT(msg);
844
845 if (req->rq_replen != msg->lm_buflens[PLAIN_PACK_MSG_OFF])
846 len = lustre_shrink_msg(msg, PLAIN_PACK_MSG_OFF,
847 req->rq_replen, 1);
848 else
849 len = lustre_msg_size_v2(msg->lm_bufcount, msg->lm_buflens);
850
851 msg->lm_secflvr = req->rq_flvr.sf_rpc;
852
853 phdr = lustre_msg_buf(msg, PLAIN_PACK_HDR_OFF, 0);
854 phdr->ph_ver = 0;
855 phdr->ph_flags = 0;
856 phdr->ph_bulk_hash_alg = req->rq_flvr.u_bulk.hash.hash_alg;
857
858 if (req->rq_pack_bulk)
859 phdr->ph_flags |= PLAIN_FL_BULK;
860
861 rs->rs_repdata_len = len;
862
863 if (likely(req->rq_packed_final)) {
864 if (lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)
865 req->rq_reply_off = plain_at_offset;
866 else
867 req->rq_reply_off = 0;
868 } else {
869 unsigned int hsize = 4;
870
871 cfs_crypto_hash_digest(CFS_HASH_ALG_CRC32,
872 lustre_msg_buf(msg, PLAIN_PACK_MSG_OFF, 0),
873 lustre_msg_buflen(msg, PLAIN_PACK_MSG_OFF),
874 NULL, 0, (unsigned char *)&msg->lm_cksum, &hsize);
38bbb63d 875 req->rq_reply_off = 0;
d7e09d03
PT		 876 }
877
0a3bdb00 878 return 0;
d7e09d03
PT		 879}
880
881static
882int plain_svc_unwrap_bulk(struct ptlrpc_request *req,
883 struct ptlrpc_bulk_desc *desc)
884{
d0bfef31 885 struct ptlrpc_reply_state *rs = req->rq_reply_state;
d7e09d03 886 struct ptlrpc_bulk_sec_desc *bsdr, *bsdv;
d0bfef31
CH		 887 struct plain_bulk_token *tokenr;
888 int rc;
d7e09d03
PT		 889
890 LASSERT(req->rq_bulk_write);
891 LASSERT(req->rq_pack_bulk);
892
893 bsdr = lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_BULK_OFF, 0);
894 tokenr = (struct plain_bulk_token *) bsdr->bsd_data;
895 bsdv = lustre_msg_buf(rs->rs_repbuf, PLAIN_PACK_BULK_OFF, 0);
896
897 bsdv->bsd_version = 0;
898 bsdv->bsd_type = SPTLRPC_BULK_DEFAULT;
899 bsdv->bsd_svc = bsdr->bsd_svc;
900 bsdv->bsd_flags = 0;
901
902 if (bsdr->bsd_svc == SPTLRPC_BULK_SVC_NULL)
903 return 0;
904
905 rc = plain_verify_bulk_csum(desc, req->rq_flvr.u_bulk.hash.hash_alg,
906 tokenr);
907 if (rc) {
908 bsdv->bsd_flags |= BSD_FL_ERR;
909 CERROR("bulk write: server verify failed: %d\n", rc);
910 }
911
912 return rc;
913}
914
915static
916int plain_svc_wrap_bulk(struct ptlrpc_request *req,
917 struct ptlrpc_bulk_desc *desc)
918{
d0bfef31 919 struct ptlrpc_reply_state *rs = req->rq_reply_state;
d7e09d03 920 struct ptlrpc_bulk_sec_desc *bsdr, *bsdv;
d0bfef31
CH		 921 struct plain_bulk_token *tokenv;
922 int rc;
d7e09d03
PT		 923
924 LASSERT(req->rq_bulk_read);
925 LASSERT(req->rq_pack_bulk);
926
927 bsdr = lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_BULK_OFF, 0);
928 bsdv = lustre_msg_buf(rs->rs_repbuf, PLAIN_PACK_BULK_OFF, 0);
929 tokenv = (struct plain_bulk_token *) bsdv->bsd_data;
930
931 bsdv->bsd_version = 0;
932 bsdv->bsd_type = SPTLRPC_BULK_DEFAULT;
933 bsdv->bsd_svc = bsdr->bsd_svc;
934 bsdv->bsd_flags = 0;
935
936 if (bsdr->bsd_svc == SPTLRPC_BULK_SVC_NULL)
937 return 0;
938
939 rc = plain_generate_bulk_csum(desc, req->rq_flvr.u_bulk.hash.hash_alg,
940 tokenv);
941 if (rc) {
2d00bd17
JP		 942 CERROR("bulk read: server failed to compute checksum: %d\n",
943 rc);
d7e09d03
PT		 944 } else {
945 if (OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_RECEIVE))
946 corrupt_bulk_data(desc);
947 }
948
949 return rc;
950}
951
952static struct ptlrpc_ctx_ops plain_ctx_ops = {
953 .refresh = plain_ctx_refresh,
954 .validate = plain_ctx_validate,
955 .sign = plain_ctx_sign,
956 .verify = plain_ctx_verify,
957 .wrap_bulk = plain_cli_wrap_bulk,
958 .unwrap_bulk = plain_cli_unwrap_bulk,
959};
960
961static struct ptlrpc_sec_cops plain_sec_cops = {
962 .create_sec = plain_create_sec,
963 .destroy_sec = plain_destroy_sec,
964 .kill_sec = plain_kill_sec,
965 .lookup_ctx = plain_lookup_ctx,
966 .release_ctx = plain_release_ctx,
967 .flush_ctx_cache = plain_flush_ctx_cache,
968 .alloc_reqbuf = plain_alloc_reqbuf,
969 .free_reqbuf = plain_free_reqbuf,
970 .alloc_repbuf = plain_alloc_repbuf,
971 .free_repbuf = plain_free_repbuf,
972 .enlarge_reqbuf = plain_enlarge_reqbuf,
973};
974
975static struct ptlrpc_sec_sops plain_sec_sops = {
976 .accept = plain_accept,
977 .alloc_rs = plain_alloc_rs,
978 .authorize = plain_authorize,
979 .free_rs = plain_free_rs,
980 .unwrap_bulk = plain_svc_unwrap_bulk,
981 .wrap_bulk = plain_svc_wrap_bulk,
982};
983
984static struct ptlrpc_sec_policy plain_policy = {
985 .sp_owner = THIS_MODULE,
986 .sp_name = "plain",
987 .sp_policy = SPTLRPC_POLICY_PLAIN,
988 .sp_cops = &plain_sec_cops,
989 .sp_sops = &plain_sec_sops,
990};
991
992int sptlrpc_plain_init(void)
993{
994 __u32 buflens[PLAIN_PACK_SEGMENTS] = { 0, };
995 int rc;
996
997 buflens[PLAIN_PACK_MSG_OFF] = lustre_msg_early_size();
998 plain_at_offset = lustre_msg_size_v2(PLAIN_PACK_SEGMENTS, buflens);
999
1000 rc = sptlrpc_register_policy(&plain_policy);
1001 if (rc)
1002 CERROR("failed to register: %d\n", rc);
1003
1004 return rc;
1005}
1006
1007void sptlrpc_plain_fini(void)
1008{
1009 int rc;
1010
1011 rc = sptlrpc_unregister_policy(&plain_policy);
1012 if (rc)
1013 CERROR("cannot unregister: %d\n", rc);
1014}
Linux kernel - Deliverables
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