lustre/smfs/audit_transfer.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  lustre/smfs/audit_transfer.c
   5  *
   6  *  Copyright (C) 2004 Cluster File Systems, Inc.
   7  *
   8  *   This file is part of Lustre, http://www.lustre.org.
   9  *
  10  *   Lustre is free software; you can redistribute it and/or
  11  *   modify it under the terms of version 2 of the GNU General Public
  12  *   License as published by the Free Software Foundation.
  13  *
  14  *   Lustre is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *   GNU General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU General Public License
  20  *   along with Lustre; if not, write to the Free Software
  21  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23 #ifndef EXPORT_SYMTAB
  24 # define EXPORT_SYMTAB
  25 #endif
  26
  27 #define DEBUG_SUBSYSTEM S_SM
  28
  29 #include <linux/fs.h>
  30 #include <linux/slab.h>
  31 #include <linux/obd_class.h>
  32 #include <linux/obd_support.h>
  33 #include <linux/lustre_lib.h>
  34 #include <linux/lustre_idl.h>
  35 #include <linux/lustre_fsfilt.h>
  36 #include <linux/lustre_smfs.h>
  37 #include <linux/lustre_audit.h>
  38 #include <linux/lustre_log.h>
  39 #include "smfs_internal.h"
  40
  41 struct transfer_item {
  42         struct llog_handle      *ti_llh;
  43         struct list_head        ti_link;
  44         void * id2name;
  45 };
  46
  47 #define TRANSFERD_STOP          0
  48 struct transferd_ctl {
  49         unsigned long           tc_flags;
  50         wait_queue_head_t       tc_waitq;
  51         struct completion       tc_starting;
  52         struct completion       tc_stopping;
  53
  54         struct list_head        tc_list;
  55         spinlock_t              tc_lock;
  56 };
  57
  58 static struct transferd_ctl transferd_tc;
  59 static DECLARE_MUTEX(transferd_sem);
  60 static int transferd_users = 0;
  61 char *buf = NULL;
  62
  63 static int transferd_check(struct transferd_ctl *tc)
  64 {
  65         int rc = 0;
  66         ENTRY;
  67
  68         if (test_bit(TRANSFERD_STOP, &tc->tc_flags))
  69                 RETURN(1);
  70
  71         spin_lock(&tc->tc_lock);
  72         rc = list_empty(&tc->tc_list) ? 0 : 1;
  73         spin_unlock(&tc->tc_lock);
  74
  75         RETURN(rc);
  76 }
  77
  78 int audit_notify(struct llog_handle *llh, void * arg)
  79 {
  80         struct transfer_item *ti;
  81         ENTRY;
  82
  83         down(&transferd_sem);
  84         if (transferd_users == 0) {
  85                 up(&transferd_sem);
  86                 RETURN(0);
  87         }
  88         up(&transferd_sem);
  89
  90         if (test_bit(TRANSFERD_STOP, &transferd_tc.tc_flags)) {
  91                 CDEBUG(D_INFO, "transfer daemon stopped\n");
  92                 RETURN(0);
  93         }
  94
  95         OBD_ALLOC(ti, sizeof(*ti));
  96         if (ti == NULL)
  97                 RETURN(-ENOMEM);
  98
  99         INIT_LIST_HEAD(&ti->ti_link);
 100         ti->ti_llh = llh;
 101         ti->id2name = arg;
 102
 103         spin_lock(&transferd_tc.tc_lock);
 104         list_add_tail(&ti->ti_link, &transferd_tc.tc_list);
 105         spin_unlock(&transferd_tc.tc_lock);
 106
 107         wake_up(&transferd_tc.tc_waitq);
 108
 109         if (llh == NULL) /* demand to flush list */
 110         {
 111                 struct l_wait_info lwi = { 0 };
 112                 l_wait_event(transferd_tc.tc_waitq,
 113                              transferd_check(&transferd_tc), &lwi);
 114         }
 115
 116         RETURN(0);
 117 }
 118
 119 const char *opstr[AUDIT_MAX] = {
 120         [AUDIT_UNKNOWN]  "unknown",
 121         [AUDIT_CREATE]   "create",
 122         [AUDIT_LINK]     "link",
 123         [AUDIT_UNLINK]   "unlink",
 124         [AUDIT_RENAME]   "rename",
 125         [AUDIT_SETATTR]  "setattr",
 126         [AUDIT_WRITE]    "write",
 127         [AUDIT_READ]     "read",
 128         [AUDIT_OPEN]     "open",
 129         [AUDIT_STAT]     "stat",
 130         [AUDIT_MMAP]     "mmap",
 131         [AUDIT_READLINK] "readlink",
 132         [AUDIT_READDIR]  "readdir",
 133 };
 134
 135 #define construct_header(buf, size, rec, id_rec)                        \
 136         snprintf(buf, size, "AUDIT:"LPX64":%u/%u:%s:%d:"DLID4":",       \
 137         rec->nid, rec->uid, rec->gid, opstr[rec->opcode], (__s16)rec->result,\
 138         (unsigned long)id_rec->au_fid, (unsigned long)id_rec->au_mds, \
 139         (unsigned long)id_rec->au_num, (unsigned long)id_rec->au_gen);
 140
 141 #define REC2ID(rec, id) {                                       \
 142         id_ino(id) = rec->au_num;                               \
 143         id_gen(id) = rec->au_gen;                               \
 144         id_type(id) = rec->au_type;                             \
 145         id_fid(id) = rec->au_fid;                               \
 146         id_group(id) = rec->au_mds;                             \
 147 }
 148
 149 static int
 150 transfer_record(struct obd_device *obd, struct audit_record *rec, int type, void * data)
 151 {
 152         struct audit_id_record *id_rec =
 153                 (struct audit_id_record *)(rec + 1);
 154         struct audit_name_record *name_rec = NULL;
 155         int (*audit_id2name)(struct obd_device *obd, char **name,
 156                      int *namelen, struct lustre_id *id) = data;
 157
 158         int n, rc = 0;
 159         ENTRY;
 160
 161         CDEBUG(D_INFO, "transfer %s\n", opstr[rec->opcode]);
 162
 163         memset(buf, 0, PAGE_SIZE);
 164         n = construct_header(buf, PAGE_SIZE, rec, id_rec);
 165         if (n < 0)
 166                 RETURN(n);
 167         /* let's use remaining space */
 168         n = PAGE_SIZE - n;
 169
 170         switch (rec->opcode)
 171         {
 172                 case AUDIT_UNLINK:
 173                         if (type != SMFS_AUDIT_NAME_REC)
 174                                 break;
 175                 case AUDIT_LINK:
 176                 case AUDIT_RENAME:
 177                         id_rec++;
 178                 default:
 179                         break;
 180         }
 181
 182         if (audit_id2name) {
 183                 char *name = NULL;
 184                 struct lustre_id id;
 185                 int namelen = 0;
 186
 187                 REC2ID(id_rec, &id);
 188
 189                 //LASSERT(id_type(&id) & S_IFMT);
 190                 rc = audit_id2name(obd, &name, &namelen, &id);
 191                 if (rc < 0) {
 192                         strncat(buf, "unknown", n);
 193                         n -= strlen("unknown");
 194                 } else if (namelen == 0) {
 195                         //root itself
 196                         if (type != SMFS_AUDIT_NAME_REC)
 197                                 strcat(buf, "/");
 198                 } else {
 199                         strncat(buf, name, n);
 200                         n -= namelen;
 201                         OBD_FREE(name, namelen);
 202                 }
 203         }
 204
 205         if (type == SMFS_AUDIT_NAME_REC && n > 0) {
 206                 name_rec = (struct audit_name_record *)(++id_rec);
 207                 strcat(buf, "/");
 208                 n -= 1;
 209                 /* get minimum size to copy name with exact len */
 210                 if (n > name_rec->name_len)
 211                         n = name_rec->name_len;
 212                 strncat(buf, name_rec->name, n);
 213         }
 214
 215         CDEBUG(D_INFO, "%s\n", buf);
 216
 217         printk("%s\n", buf);
 218
 219         RETURN(0);
 220 }
 221
 222 static int transfer_cb(struct llog_handle *llh, struct llog_rec_hdr *rec,
 223                        void *data)
 224 {
 225         struct obd_device *obd = llh->lgh_ctxt->loc_obd;
 226         struct audit_record *ad_rec;
 227         struct llog_cookie cookie;
 228         ENTRY;
 229
 230         if (!(le32_to_cpu(llh->lgh_hdr->llh_flags) & LLOG_F_IS_PLAIN)) {
 231                 CERROR("log is not plain\n");
 232                 RETURN(-EINVAL);
 233         }
 234         if (rec->lrh_type != cpu_to_le32(SMFS_AUDIT_GEN_REC) &&
 235             rec->lrh_type != cpu_to_le32(SMFS_AUDIT_NAME_REC)) {
 236                 CERROR("log record type error\n");
 237                 RETURN(-EINVAL);
 238         }
 239
 240         ad_rec = (struct audit_record *)((char *)rec + sizeof(*rec));
 241
 242         LASSERT(ad_rec->opcode < AUDIT_MAX);
 243
 244         cookie.lgc_lgl = llh->lgh_id;
 245         cookie.lgc_subsys = LLOG_AUDIT_ORIG_CTXT;
 246         cookie.lgc_index = le32_to_cpu(rec->lrh_index);
 247
 248         transfer_record(obd, ad_rec, rec->lrh_type, data);
 249
 250         llog_cancel(llh->lgh_ctxt, 1, &cookie, 0, NULL);
 251
 252         RETURN(0);
 253 }
 254
 255 static int audit_transfer(struct transfer_item *ti)
 256 {
 257         struct llog_handle *llh = ti->ti_llh;
 258         int rc = 0;
 259         ENTRY;
 260
 261         if (!llh)
 262                 RETURN(0);
 263
 264         rc = llog_cat_process(llh, (llog_cb_t)&transfer_cb, ti->id2name);
 265         if (rc)
 266                 CERROR("process catalog log failed: rc(%d)\n", rc);
 267
 268         RETURN(0);
 269 }
 270
 271 static int transferd(void *arg)
 272 {
 273         struct transferd_ctl *tc = arg;
 274         unsigned long flags;
 275         struct list_head *pos, *tmp;
 276         struct transfer_item *ti = NULL;
 277         ENTRY;
 278
 279         lock_kernel();
 280
 281         /* ptlrpc_daemonize() */
 282         exit_mm(current);
 283         lustre_daemonize_helper();
 284         exit_files(current);
 285         reparent_to_init();
 286
 287         SIGNAL_MASK_LOCK(current, flags);
 288         sigfillset(&current->blocked);
 289         RECALC_SIGPENDING;
 290         SIGNAL_MASK_UNLOCK(current, flags);
 291         THREAD_NAME(current->comm, sizeof(current->comm) - 1, "%s",
 292                     "audit_transferd");
 293         unlock_kernel();
 294
 295         complete(&tc->tc_starting);
 296
 297         LASSERT(buf == NULL);
 298         OBD_ALLOC(buf, PAGE_SIZE);
 299         LASSERT(buf != NULL);
 300
 301         while (1) {
 302                 struct l_wait_info lwi = { 0 };
 303
 304                 l_wait_event(tc->tc_waitq, transferd_check(tc), &lwi);
 305
 306                 if (test_bit(TRANSFERD_STOP, &tc->tc_flags))
 307                         break;
 308
 309                 spin_lock(&tc->tc_lock);
 310                 LASSERT(!list_empty(&tc->tc_list));
 311                 ti = list_entry(tc->tc_list.next, struct transfer_item, ti_link);
 312                 list_del_init(&ti->ti_link);
 313                 spin_unlock(&tc->tc_lock);
 314
 315                 audit_transfer(ti);
 316                 OBD_FREE(ti, sizeof(*ti));
 317
 318         }
 319
 320         OBD_FREE(buf, PAGE_SIZE);
 321
 322         spin_lock(&tc->tc_lock);
 323         list_for_each_safe(pos, tmp, &tc->tc_list) {
 324                 ti = list_entry(pos, struct transfer_item, ti_link);
 325                 list_del_init(&ti->ti_link);
 326                 OBD_FREE(ti, sizeof(*ti));
 327         }
 328         spin_unlock(&tc->tc_lock);
 329
 330         complete(&tc->tc_stopping);
 331         RETURN(0);
 332 }
 333
 334 int audit_start_transferd()
 335 {
 336         int rc = 0;
 337         ENTRY;
 338
 339         down(&transferd_sem);
 340         if (++transferd_users != 1)
 341                 GOTO(out, rc = 0);
 342
 343         memset(&transferd_tc, 0, sizeof(transferd_tc));
 344         init_completion(&transferd_tc.tc_starting);
 345         init_completion(&transferd_tc.tc_stopping);
 346         init_waitqueue_head(&transferd_tc.tc_waitq);
 347         transferd_tc.tc_flags = 0;
 348         INIT_LIST_HEAD(&transferd_tc.tc_list);
 349         spin_lock_init(&transferd_tc.tc_lock);
 350
 351         if (kernel_thread(transferd, &transferd_tc, 0) < 0) {
 352                 transferd_users--;
 353                 GOTO(out, rc = -ECHILD);
 354         }
 355
 356         wait_for_completion(&transferd_tc.tc_starting);
 357 out:
 358         up(&transferd_sem);
 359         RETURN(rc);
 360 }
 361
 362 int audit_stop_transferd(void)
 363 {
 364         int rc = 0;
 365         ENTRY;
 366
 367         down(&transferd_sem);
 368         if (--transferd_users > 0)
 369                 GOTO(out, rc = 0);
 370
 371         set_bit(TRANSFERD_STOP, &transferd_tc.tc_flags);
 372         wake_up(&transferd_tc.tc_waitq);
 373         wait_for_completion(&transferd_tc.tc_stopping);
 374 out:
 375         up(&transferd_sem);
 376         RETURN(rc);
 377 }