[deliverable/linux.git] / drivers / staging / lustre / lustre / ptlrpc / sec_null.c

/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2011, 2012, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 *
 * lustre/ptlrpc/sec_null.c
 *
 * Author: Eric Mei <ericm@clusterfs.com>
 */

#define DEBUG_SUBSYSTEM S_SEC


#include "../include/obd_support.h"
#include "../include/obd_cksum.h"
#include "../include/obd_class.h"
#include "../include/lustre_net.h"
#include "../include/lustre_sec.h"

static struct ptlrpc_sec_policy null_policy;
static struct ptlrpc_sec	null_sec;
static struct ptlrpc_cli_ctx    null_cli_ctx;
static struct ptlrpc_svc_ctx    null_svc_ctx;

/*
 * we can temporarily use the topmost 8-bits of lm_secflvr to identify
 * the source sec part.
 */
static inline
void null_encode_sec_part(struct lustre_msg *msg, enum lustre_sec_part sp)
{
	msg->lm_secflvr |= (((__u32) sp) & 0xFF) << 24;
}

static inline
enum lustre_sec_part null_decode_sec_part(struct lustre_msg *msg)
{
	return (msg->lm_secflvr >> 24) & 0xFF;
}

static int null_ctx_refresh(struct ptlrpc_cli_ctx *ctx)
{
	/* should never reach here */
	LBUG();
	return 0;
}

static
int null_ctx_sign(struct ptlrpc_cli_ctx *ctx, struct ptlrpc_request *req)
{
	req->rq_reqbuf->lm_secflvr = SPTLRPC_FLVR_NULL;

	if (!req->rq_import->imp_dlm_fake) {
		struct obd_device *obd = req->rq_import->imp_obd;
		null_encode_sec_part(req->rq_reqbuf,
				     obd->u.cli.cl_sp_me);
	}
	req->rq_reqdata_len = req->rq_reqlen;
	return 0;
}

static
int null_ctx_verify(struct ptlrpc_cli_ctx *ctx, struct ptlrpc_request *req)
{
	__u32 cksums, cksumc;

	LASSERT(req->rq_repdata);

	req->rq_repmsg = req->rq_repdata;
	req->rq_replen = req->rq_repdata_len;

	if (req->rq_early) {
		cksums = lustre_msg_get_cksum(req->rq_repdata);
		cksumc = lustre_msg_calc_cksum(req->rq_repmsg);
		if (cksumc != cksums) {
			CDEBUG(D_SEC,
			       "early reply checksum mismatch: %08x != %08x\n",
			       cksumc, cksums);
			return -EINVAL;
		}
	}

	return 0;
}

static
struct ptlrpc_sec *null_create_sec(struct obd_import *imp,
				   struct ptlrpc_svc_ctx *svc_ctx,
				   struct sptlrpc_flavor *sf)
{
	LASSERT(SPTLRPC_FLVR_POLICY(sf->sf_rpc) == SPTLRPC_POLICY_NULL);

	/* general layer has take a module reference for us, because we never
	 * really destroy the sec, simply release the reference here.
	 */
	sptlrpc_policy_put(&null_policy);
	return &null_sec;
}

static
void null_destroy_sec(struct ptlrpc_sec *sec)
{
	LASSERT(sec == &null_sec);
}

static
struct ptlrpc_cli_ctx *null_lookup_ctx(struct ptlrpc_sec *sec,
				       struct vfs_cred *vcred,
				       int create, int remove_dead)
{
	atomic_inc(&null_cli_ctx.cc_refcount);
	return &null_cli_ctx;
}

static
int null_flush_ctx_cache(struct ptlrpc_sec *sec,
			 uid_t uid,
			 int grace, int force)
{
	return 0;
}

static
int null_alloc_reqbuf(struct ptlrpc_sec *sec,
		      struct ptlrpc_request *req,
		      int msgsize)
{
	if (!req->rq_reqbuf) {
		int alloc_size = size_roundup_power2(msgsize);

		LASSERT(!req->rq_pool);
		req->rq_reqbuf = libcfs_kvzalloc(alloc_size, GFP_NOFS);
		if (!req->rq_reqbuf)
			return -ENOMEM;

		req->rq_reqbuf_len = alloc_size;
	} else {
		LASSERT(req->rq_pool);
		LASSERT(req->rq_reqbuf_len >= msgsize);
		memset(req->rq_reqbuf, 0, msgsize);
	}

	req->rq_reqmsg = req->rq_reqbuf;
	return 0;
}

static
void null_free_reqbuf(struct ptlrpc_sec *sec,
		      struct ptlrpc_request *req)
{
	if (!req->rq_pool) {
		LASSERTF(req->rq_reqmsg == req->rq_reqbuf,
			 "req %p: reqmsg %p is not reqbuf %p in null sec\n",
			 req, req->rq_reqmsg, req->rq_reqbuf);
		LASSERTF(req->rq_reqbuf_len >= req->rq_reqlen,
			 "req %p: reqlen %d should smaller than buflen %d\n",
			 req, req->rq_reqlen, req->rq_reqbuf_len);

		kvfree(req->rq_reqbuf);
		req->rq_reqbuf = NULL;
		req->rq_reqbuf_len = 0;
	}
}

static
int null_alloc_repbuf(struct ptlrpc_sec *sec,
		      struct ptlrpc_request *req,
		      int msgsize)
{
	/* add space for early replied */
	msgsize += lustre_msg_early_size();

	msgsize = size_roundup_power2(msgsize);

	req->rq_repbuf = libcfs_kvzalloc(msgsize, GFP_NOFS);
	if (!req->rq_repbuf)
		return -ENOMEM;

	req->rq_repbuf_len = msgsize;
	return 0;
}

static
void null_free_repbuf(struct ptlrpc_sec *sec,
		      struct ptlrpc_request *req)
{
	LASSERT(req->rq_repbuf);

	kvfree(req->rq_repbuf);
	req->rq_repbuf = NULL;
	req->rq_repbuf_len = 0;
}

static
int null_enlarge_reqbuf(struct ptlrpc_sec *sec,
			struct ptlrpc_request *req,
			int segment, int newsize)
{
	struct lustre_msg *newbuf;
	struct lustre_msg *oldbuf = req->rq_reqmsg;
	int oldsize, newmsg_size, alloc_size;

	LASSERT(req->rq_reqbuf);
	LASSERT(req->rq_reqbuf == req->rq_reqmsg);
	LASSERT(req->rq_reqbuf_len >= req->rq_reqlen);
	LASSERT(req->rq_reqlen == lustre_packed_msg_size(oldbuf));

	/* compute new message size */
	oldsize = req->rq_reqbuf->lm_buflens[segment];
	req->rq_reqbuf->lm_buflens[segment] = newsize;
	newmsg_size = lustre_packed_msg_size(oldbuf);
	req->rq_reqbuf->lm_buflens[segment] = oldsize;

	/* request from pool should always have enough buffer */
	LASSERT(!req->rq_pool || req->rq_reqbuf_len >= newmsg_size);

	if (req->rq_reqbuf_len < newmsg_size) {
		alloc_size = size_roundup_power2(newmsg_size);

		newbuf = libcfs_kvzalloc(alloc_size, GFP_NOFS);
		if (newbuf == NULL)
			return -ENOMEM;

		/* Must lock this, so that otherwise unprotected change of
		 * rq_reqmsg is not racing with parallel processing of
		 * imp_replay_list traversing threads. See LU-3333
		 * This is a bandaid at best, we really need to deal with this
		 * in request enlarging code before unpacking that's already
		 * there */
		if (req->rq_import)
			spin_lock(&req->rq_import->imp_lock);
		memcpy(newbuf, req->rq_reqbuf, req->rq_reqlen);

		kvfree(req->rq_reqbuf);
		req->rq_reqbuf = req->rq_reqmsg = newbuf;
		req->rq_reqbuf_len = alloc_size;

		if (req->rq_import)
			spin_unlock(&req->rq_import->imp_lock);
	}

	_sptlrpc_enlarge_msg_inplace(req->rq_reqmsg, segment, newsize);
	req->rq_reqlen = newmsg_size;

	return 0;
}

static struct ptlrpc_svc_ctx null_svc_ctx = {
	.sc_refcount    = ATOMIC_INIT(1),
	.sc_policy      = &null_policy,
};

static
int null_accept(struct ptlrpc_request *req)
{
	LASSERT(SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) ==
		SPTLRPC_POLICY_NULL);

	if (req->rq_flvr.sf_rpc != SPTLRPC_FLVR_NULL) {
		CERROR("Invalid rpc flavor 0x%x\n", req->rq_flvr.sf_rpc);
		return SECSVC_DROP;
	}

	req->rq_sp_from = null_decode_sec_part(req->rq_reqbuf);

	req->rq_reqmsg = req->rq_reqbuf;
	req->rq_reqlen = req->rq_reqdata_len;

	req->rq_svc_ctx = &null_svc_ctx;
	atomic_inc(&req->rq_svc_ctx->sc_refcount);

	return SECSVC_OK;
}

static
int null_alloc_rs(struct ptlrpc_request *req, int msgsize)
{
	struct ptlrpc_reply_state *rs;
	int rs_size = sizeof(*rs) + msgsize;

	LASSERT(msgsize % 8 == 0);

	rs = req->rq_reply_state;

	if (rs) {
		/* pre-allocated */
		LASSERT(rs->rs_size >= rs_size);
	} else {
		rs = libcfs_kvzalloc(rs_size, GFP_NOFS);
		if (rs == NULL)
			return -ENOMEM;

		rs->rs_size = rs_size;
	}

	rs->rs_svc_ctx = req->rq_svc_ctx;
	atomic_inc(&req->rq_svc_ctx->sc_refcount);

	rs->rs_repbuf = (struct lustre_msg *) (rs + 1);
	rs->rs_repbuf_len = rs_size - sizeof(*rs);
	rs->rs_msg = rs->rs_repbuf;

	req->rq_reply_state = rs;
	return 0;
}

static
void null_free_rs(struct ptlrpc_reply_state *rs)
{
	LASSERT_ATOMIC_GT(&rs->rs_svc_ctx->sc_refcount, 1);
	atomic_dec(&rs->rs_svc_ctx->sc_refcount);

	if (!rs->rs_prealloc)
		kvfree(rs);
}

static
int null_authorize(struct ptlrpc_request *req)
{
	struct ptlrpc_reply_state *rs = req->rq_reply_state;

	LASSERT(rs);

	rs->rs_repbuf->lm_secflvr = SPTLRPC_FLVR_NULL;
	rs->rs_repdata_len = req->rq_replen;

	if (likely(req->rq_packed_final)) {
		if (lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)
			req->rq_reply_off = lustre_msg_early_size();
		else
			req->rq_reply_off = 0;
	} else {
		__u32 cksum;

		cksum = lustre_msg_calc_cksum(rs->rs_repbuf);
		lustre_msg_set_cksum(rs->rs_repbuf, cksum);
		req->rq_reply_off = 0;
	}

	return 0;
}

static struct ptlrpc_ctx_ops null_ctx_ops = {
	.refresh		= null_ctx_refresh,
	.sign		   = null_ctx_sign,
	.verify		 = null_ctx_verify,
};

static struct ptlrpc_sec_cops null_sec_cops = {
	.create_sec	     = null_create_sec,
	.destroy_sec	    = null_destroy_sec,
	.lookup_ctx	     = null_lookup_ctx,
	.flush_ctx_cache	= null_flush_ctx_cache,
	.alloc_reqbuf	   = null_alloc_reqbuf,
	.alloc_repbuf	   = null_alloc_repbuf,
	.free_reqbuf	    = null_free_reqbuf,
	.free_repbuf	    = null_free_repbuf,
	.enlarge_reqbuf	 = null_enlarge_reqbuf,
};

static struct ptlrpc_sec_sops null_sec_sops = {
	.accept		 = null_accept,
	.alloc_rs	       = null_alloc_rs,
	.authorize	      = null_authorize,
	.free_rs		= null_free_rs,
};

static struct ptlrpc_sec_policy null_policy = {
	.sp_owner	       = THIS_MODULE,
	.sp_name		= "sec.null",
	.sp_policy	      = SPTLRPC_POLICY_NULL,
	.sp_cops		= &null_sec_cops,
	.sp_sops		= &null_sec_sops,
};

static void null_init_internal(void)
{
	static HLIST_HEAD(__list);

	null_sec.ps_policy = &null_policy;
	atomic_set(&null_sec.ps_refcount, 1);     /* always busy */
	null_sec.ps_id = -1;
	null_sec.ps_import = NULL;
	null_sec.ps_flvr.sf_rpc = SPTLRPC_FLVR_NULL;
	null_sec.ps_flvr.sf_flags = 0;
	null_sec.ps_part = LUSTRE_SP_ANY;
	null_sec.ps_dying = 0;
	spin_lock_init(&null_sec.ps_lock);
	atomic_set(&null_sec.ps_nctx, 1);	 /* for "null_cli_ctx" */
	INIT_LIST_HEAD(&null_sec.ps_gc_list);
	null_sec.ps_gc_interval = 0;
	null_sec.ps_gc_next = 0;

	hlist_add_head(&null_cli_ctx.cc_cache, &__list);
	atomic_set(&null_cli_ctx.cc_refcount, 1);    /* for hash */
	null_cli_ctx.cc_sec = &null_sec;
	null_cli_ctx.cc_ops = &null_ctx_ops;
	null_cli_ctx.cc_expire = 0;
	null_cli_ctx.cc_flags = PTLRPC_CTX_CACHED | PTLRPC_CTX_ETERNAL |
				PTLRPC_CTX_UPTODATE;
	null_cli_ctx.cc_vcred.vc_uid = 0;
	spin_lock_init(&null_cli_ctx.cc_lock);
	INIT_LIST_HEAD(&null_cli_ctx.cc_req_list);
	INIT_LIST_HEAD(&null_cli_ctx.cc_gc_chain);
}

int sptlrpc_null_init(void)
{
	int rc;

	null_init_internal();

	rc = sptlrpc_register_policy(&null_policy);
	if (rc)
		CERROR("failed to register %s: %d\n", null_policy.sp_name, rc);

	return rc;
}

void sptlrpc_null_fini(void)
{
	int rc;

	rc = sptlrpc_unregister_policy(&null_policy);
	if (rc)
		CERROR("failed to unregister %s: %d\n",
		       null_policy.sp_name, rc);
}
Commit	Line	Data
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	*
	30	* Copyright (c) 2011, 2012, Intel Corporation.
	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_null.c
	37	*
	38	* Author: Eric Mei <ericm@clusterfs.com>
	39	*/
	40
	41	#define DEBUG_SUBSYSTEM S_SEC
	42
	43
e27db149 GKH	44	#include "../include/obd_support.h"
	45	#include "../include/obd_cksum.h"
	46	#include "../include/obd_class.h"
	47	#include "../include/lustre_net.h"
	48	#include "../include/lustre_sec.h"
d7e09d03 PT	49
	50	static struct ptlrpc_sec_policy null_policy;
	51	static struct ptlrpc_sec null_sec;
	52	static struct ptlrpc_cli_ctx null_cli_ctx;
	53	static struct ptlrpc_svc_ctx null_svc_ctx;
	54
	55	/*
	56	* we can temporarily use the topmost 8-bits of lm_secflvr to identify
	57	* the source sec part.
	58	*/
	59	static inline
	60	void null_encode_sec_part(struct lustre_msg *msg, enum lustre_sec_part sp)
	61	{
	62	msg->lm_secflvr \|= (((__u32) sp) & 0xFF) << 24;
	63	}
	64
	65	static inline
	66	enum lustre_sec_part null_decode_sec_part(struct lustre_msg *msg)
	67	{
	68	return (msg->lm_secflvr >> 24) & 0xFF;
	69	}
	70
	71	static int null_ctx_refresh(struct ptlrpc_cli_ctx *ctx)
	72	{
	73	/* should never reach here */
	74	LBUG();
	75	return 0;
	76	}
	77
	78	static
	79	int null_ctx_sign(struct ptlrpc_cli_ctx ctx, struct ptlrpc_request req)
	80	{
	81	req->rq_reqbuf->lm_secflvr = SPTLRPC_FLVR_NULL;
	82
	83	if (!req->rq_import->imp_dlm_fake) {
	84	struct obd_device *obd = req->rq_import->imp_obd;
	85	null_encode_sec_part(req->rq_reqbuf,
	86	obd->u.cli.cl_sp_me);
	87	}
	88	req->rq_reqdata_len = req->rq_reqlen;
	89	return 0;
	90	}
	91
	92	static
	93	int null_ctx_verify(struct ptlrpc_cli_ctx ctx, struct ptlrpc_request req)
	94	{
d0bfef31	95	__u32 cksums, cksumc;
d7e09d03 PT	96
	97	LASSERT(req->rq_repdata);
	98
	99	req->rq_repmsg = req->rq_repdata;
	100	req->rq_replen = req->rq_repdata_len;
	101
	102	if (req->rq_early) {
	103	cksums = lustre_msg_get_cksum(req->rq_repdata);
d7e09d03	104	cksumc = lustre_msg_calc_cksum(req->rq_repmsg);
d7e09d03 PT	105	if (cksumc != cksums) {
	106	CDEBUG(D_SEC,
	107	"early reply checksum mismatch: %08x != %08x\n",
	108	cksumc, cksums);
	109	return -EINVAL;
	110	}
	111	}
	112
	113	return 0;
	114	}
	115
	116	static
	117	struct ptlrpc_sec null_create_sec(struct obd_import imp,
	118	struct ptlrpc_svc_ctx *svc_ctx,
	119	struct sptlrpc_flavor *sf)
	120	{
	121	LASSERT(SPTLRPC_FLVR_POLICY(sf->sf_rpc) == SPTLRPC_POLICY_NULL);
	122
	123	/* general layer has take a module reference for us, because we never
	124	* really destroy the sec, simply release the reference here.
	125	*/
	126	sptlrpc_policy_put(&null_policy);
	127	return &null_sec;
	128	}
	129
	130	static
	131	void null_destroy_sec(struct ptlrpc_sec *sec)
	132	{
	133	LASSERT(sec == &null_sec);
	134	}
	135
	136	static
	137	struct ptlrpc_cli_ctx null_lookup_ctx(struct ptlrpc_sec sec,
	138	struct vfs_cred *vcred,
	139	int create, int remove_dead)
	140	{
	141	atomic_inc(&null_cli_ctx.cc_refcount);
	142	return &null_cli_ctx;
	143	}
	144
	145	static
	146	int null_flush_ctx_cache(struct ptlrpc_sec *sec,
	147	uid_t uid,
	148	int grace, int force)
	149	{
	150	return 0;
	151	}
	152
	153	static
	154	int null_alloc_reqbuf(struct ptlrpc_sec *sec,
	155	struct ptlrpc_request *req,
	156	int msgsize)
	157	{
	158	if (!req->rq_reqbuf) {
	159	int alloc_size = size_roundup_power2(msgsize);
	160
	161	LASSERT(!req->rq_pool);
ee0ec194	162	req->rq_reqbuf = libcfs_kvzalloc(alloc_size, GFP_NOFS);
d7e09d03 PT	163	if (!req->rq_reqbuf)
	164	return -ENOMEM;
	165
	166	req->rq_reqbuf_len = alloc_size;
	167	} else {
	168	LASSERT(req->rq_pool);
	169	LASSERT(req->rq_reqbuf_len >= msgsize);
	170	memset(req->rq_reqbuf, 0, msgsize);
	171	}
	172
	173	req->rq_reqmsg = req->rq_reqbuf;
	174	return 0;
	175	}
	176
	177	static
	178	void null_free_reqbuf(struct ptlrpc_sec *sec,
	179	struct ptlrpc_request *req)
	180	{
	181	if (!req->rq_pool) {
	182	LASSERTF(req->rq_reqmsg == req->rq_reqbuf,
	183	"req %p: reqmsg %p is not reqbuf %p in null sec\n",
	184	req, req->rq_reqmsg, req->rq_reqbuf);
	185	LASSERTF(req->rq_reqbuf_len >= req->rq_reqlen,
	186	"req %p: reqlen %d should smaller than buflen %d\n",
	187	req, req->rq_reqlen, req->rq_reqbuf_len);
	188
ee0ec194	189	kvfree(req->rq_reqbuf);
d7e09d03 PT	190	req->rq_reqbuf = NULL;
	191	req->rq_reqbuf_len = 0;
	192	}
	193	}
	194
	195	static
	196	int null_alloc_repbuf(struct ptlrpc_sec *sec,
	197	struct ptlrpc_request *req,
	198	int msgsize)
	199	{
	200	/* add space for early replied */
	201	msgsize += lustre_msg_early_size();
	202
	203	msgsize = size_roundup_power2(msgsize);
	204
ee0ec194	205	req->rq_repbuf = libcfs_kvzalloc(msgsize, GFP_NOFS);
d7e09d03 PT	206	if (!req->rq_repbuf)
	207	return -ENOMEM;
	208
	209	req->rq_repbuf_len = msgsize;
	210	return 0;
	211	}
	212
	213	static
	214	void null_free_repbuf(struct ptlrpc_sec *sec,
	215	struct ptlrpc_request *req)
	216	{
	217	LASSERT(req->rq_repbuf);
	218
ee0ec194	219	kvfree(req->rq_repbuf);
d7e09d03 PT	220	req->rq_repbuf = NULL;
	221	req->rq_repbuf_len = 0;
	222	}
	223
	224	static
	225	int null_enlarge_reqbuf(struct ptlrpc_sec *sec,
	226	struct ptlrpc_request *req,
	227	int segment, int newsize)
	228	{
d0bfef31 CH	229	struct lustre_msg *newbuf;
	230	struct lustre_msg *oldbuf = req->rq_reqmsg;
	231	int oldsize, newmsg_size, alloc_size;
d7e09d03 PT	232
	233	LASSERT(req->rq_reqbuf);
	234	LASSERT(req->rq_reqbuf == req->rq_reqmsg);
	235	LASSERT(req->rq_reqbuf_len >= req->rq_reqlen);
	236	LASSERT(req->rq_reqlen == lustre_packed_msg_size(oldbuf));
	237
	238	/* compute new message size */
	239	oldsize = req->rq_reqbuf->lm_buflens[segment];
	240	req->rq_reqbuf->lm_buflens[segment] = newsize;
	241	newmsg_size = lustre_packed_msg_size(oldbuf);
	242	req->rq_reqbuf->lm_buflens[segment] = oldsize;
	243
	244	/* request from pool should always have enough buffer */
	245	LASSERT(!req->rq_pool \|\| req->rq_reqbuf_len >= newmsg_size);
	246
	247	if (req->rq_reqbuf_len < newmsg_size) {
	248	alloc_size = size_roundup_power2(newmsg_size);
	249
ee0ec194	250	newbuf = libcfs_kvzalloc(alloc_size, GFP_NOFS);
d7e09d03 PT	251	if (newbuf == NULL)
	252	return -ENOMEM;
	253
61d7258b OD	254	/* Must lock this, so that otherwise unprotected change of
	255	* rq_reqmsg is not racing with parallel processing of
	256	* imp_replay_list traversing threads. See LU-3333
	257	* This is a bandaid at best, we really need to deal with this
	258	* in request enlarging code before unpacking that's already
	259	* there */
	260	if (req->rq_import)
	261	spin_lock(&req->rq_import->imp_lock);
d7e09d03 PT	262	memcpy(newbuf, req->rq_reqbuf, req->rq_reqlen);
d7e09d03 PT	263
ee0ec194	264	kvfree(req->rq_reqbuf);
d7e09d03 PT	265	req->rq_reqbuf = req->rq_reqmsg = newbuf;
d7e09d03 PT	266	req->rq_reqbuf_len = alloc_size;
61d7258b OD	267
	268	if (req->rq_import)
	269	spin_unlock(&req->rq_import->imp_lock);
d7e09d03 PT	270	}
	271
	272	_sptlrpc_enlarge_msg_inplace(req->rq_reqmsg, segment, newsize);
	273	req->rq_reqlen = newmsg_size;
	274
	275	return 0;
	276	}
	277
	278	static struct ptlrpc_svc_ctx null_svc_ctx = {
	279	.sc_refcount = ATOMIC_INIT(1),
	280	.sc_policy = &null_policy,
	281	};
	282
	283	static
	284	int null_accept(struct ptlrpc_request *req)
	285	{
	286	LASSERT(SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) ==
	287	SPTLRPC_POLICY_NULL);
	288
	289	if (req->rq_flvr.sf_rpc != SPTLRPC_FLVR_NULL) {
	290	CERROR("Invalid rpc flavor 0x%x\n", req->rq_flvr.sf_rpc);
	291	return SECSVC_DROP;
	292	}
	293
	294	req->rq_sp_from = null_decode_sec_part(req->rq_reqbuf);
	295
	296	req->rq_reqmsg = req->rq_reqbuf;
	297	req->rq_reqlen = req->rq_reqdata_len;
	298
	299	req->rq_svc_ctx = &null_svc_ctx;
	300	atomic_inc(&req->rq_svc_ctx->sc_refcount);
	301
	302	return SECSVC_OK;
	303	}
	304
	305	static
	306	int null_alloc_rs(struct ptlrpc_request *req, int msgsize)
	307	{
	308	struct ptlrpc_reply_state *rs;
	309	int rs_size = sizeof(*rs) + msgsize;
	310
	311	LASSERT(msgsize % 8 == 0);
	312
	313	rs = req->rq_reply_state;
	314
	315	if (rs) {
	316	/* pre-allocated */
	317	LASSERT(rs->rs_size >= rs_size);
	318	} else {
ee0ec194	319	rs = libcfs_kvzalloc(rs_size, GFP_NOFS);
d7e09d03 PT	320	if (rs == NULL)
	321	return -ENOMEM;
	322
	323	rs->rs_size = rs_size;
	324	}
	325
	326	rs->rs_svc_ctx = req->rq_svc_ctx;
	327	atomic_inc(&req->rq_svc_ctx->sc_refcount);
	328
	329	rs->rs_repbuf = (struct lustre_msg *) (rs + 1);
	330	rs->rs_repbuf_len = rs_size - sizeof(*rs);
	331	rs->rs_msg = rs->rs_repbuf;
	332
	333	req->rq_reply_state = rs;
	334	return 0;
	335	}
	336
	337	static
	338	void null_free_rs(struct ptlrpc_reply_state *rs)
	339	{
	340	LASSERT_ATOMIC_GT(&rs->rs_svc_ctx->sc_refcount, 1);
	341	atomic_dec(&rs->rs_svc_ctx->sc_refcount);
	342
	343	if (!rs->rs_prealloc)
ee0ec194	344	kvfree(rs);
d7e09d03 PT	345	}
	346
	347	static
	348	int null_authorize(struct ptlrpc_request *req)
	349	{
	350	struct ptlrpc_reply_state *rs = req->rq_reply_state;
	351
	352	LASSERT(rs);
	353
	354	rs->rs_repbuf->lm_secflvr = SPTLRPC_FLVR_NULL;
	355	rs->rs_repdata_len = req->rq_replen;
	356
	357	if (likely(req->rq_packed_final)) {
	358	if (lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)
	359	req->rq_reply_off = lustre_msg_early_size();
	360	else
	361	req->rq_reply_off = 0;
	362	} else {
	363	__u32 cksum;
	364
d7e09d03	365	cksum = lustre_msg_calc_cksum(rs->rs_repbuf);
d7e09d03 PT	366	lustre_msg_set_cksum(rs->rs_repbuf, cksum);
	367	req->rq_reply_off = 0;
	368	}
	369
	370	return 0;
	371	}
	372
	373	static struct ptlrpc_ctx_ops null_ctx_ops = {
	374	.refresh = null_ctx_refresh,
	375	.sign = null_ctx_sign,
	376	.verify = null_ctx_verify,
	377	};
	378
	379	static struct ptlrpc_sec_cops null_sec_cops = {
	380	.create_sec = null_create_sec,
	381	.destroy_sec = null_destroy_sec,
	382	.lookup_ctx = null_lookup_ctx,
	383	.flush_ctx_cache = null_flush_ctx_cache,
	384	.alloc_reqbuf = null_alloc_reqbuf,
	385	.alloc_repbuf = null_alloc_repbuf,
	386	.free_reqbuf = null_free_reqbuf,
	387	.free_repbuf = null_free_repbuf,
	388	.enlarge_reqbuf = null_enlarge_reqbuf,
	389	};
	390
	391	static struct ptlrpc_sec_sops null_sec_sops = {
	392	.accept = null_accept,
	393	.alloc_rs = null_alloc_rs,
	394	.authorize = null_authorize,
	395	.free_rs = null_free_rs,
	396	};
	397
	398	static struct ptlrpc_sec_policy null_policy = {
	399	.sp_owner = THIS_MODULE,
	400	.sp_name = "sec.null",
	401	.sp_policy = SPTLRPC_POLICY_NULL,
	402	.sp_cops = &null_sec_cops,
	403	.sp_sops = &null_sec_sops,
	404	};
	405
	406	static void null_init_internal(void)
	407	{
	408	static HLIST_HEAD(__list);
	409
	410	null_sec.ps_policy = &null_policy;
	411	atomic_set(&null_sec.ps_refcount, 1); /* always busy */
	412	null_sec.ps_id = -1;
	413	null_sec.ps_import = NULL;
	414	null_sec.ps_flvr.sf_rpc = SPTLRPC_FLVR_NULL;
	415	null_sec.ps_flvr.sf_flags = 0;
	416	null_sec.ps_part = LUSTRE_SP_ANY;
	417	null_sec.ps_dying = 0;
	418	spin_lock_init(&null_sec.ps_lock);
	419	atomic_set(&null_sec.ps_nctx, 1); /* for "null_cli_ctx" */
	420	INIT_LIST_HEAD(&null_sec.ps_gc_list);
	421	null_sec.ps_gc_interval = 0;
	422	null_sec.ps_gc_next = 0;
	423
	424	hlist_add_head(&null_cli_ctx.cc_cache, &__list);
	425	atomic_set(&null_cli_ctx.cc_refcount, 1); /* for hash */
	426	null_cli_ctx.cc_sec = &null_sec;
	427	null_cli_ctx.cc_ops = &null_ctx_ops;
	428	null_cli_ctx.cc_expire = 0;
	429	null_cli_ctx.cc_flags = PTLRPC_CTX_CACHED \| PTLRPC_CTX_ETERNAL \|
430	PTLRPC_CTX_UPTODATE;
431	null_cli_ctx.cc_vcred.vc_uid = 0;
432	spin_lock_init(&null_cli_ctx.cc_lock);
433	INIT_LIST_HEAD(&null_cli_ctx.cc_req_list);
434	INIT_LIST_HEAD(&null_cli_ctx.cc_gc_chain);
435	}
436
437	int sptlrpc_null_init(void)
438	{
439	int rc;
440
441	null_init_internal();
442
443	rc = sptlrpc_register_policy(&null_policy);
444	if (rc)
445	CERROR("failed to register %s: %d\n", null_policy.sp_name, rc);
446
447	return rc;
448	}
449
450	void sptlrpc_null_fini(void)
451	{
452	int rc;
453
454	rc = sptlrpc_unregister_policy(&null_policy);
455	if (rc)
1d8cb70c GD	456	CERROR("failed to unregister %s: %d\n",
1d8cb70c GD	457	null_policy.sp_name, rc);
d7e09d03	458	}