lnet/lnet/config.c

   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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #define DEBUG_SUBSYSTEM S_LNET
  34
  35 #include <linux/ctype.h>
  36 #include <linux/inetdevice.h>
  37 #include <linux/nsproxy.h>
  38 #include <net/net_namespace.h>
  39 #include <lnet/lib-lnet.h>
  40
  41 /* tmp struct for parsing routes */
  42 struct lnet_text_buf {
  43         struct list_head        ltb_list;       /* stash on lists */
  44         int                     ltb_size;       /* allocated size */
  45         char                    ltb_text[0];    /* text buffer */
  46 };
  47
  48 static int lnet_tbnob = 0;                      /* track text buf allocation */
  49 #define LNET_MAX_TEXTBUF_NOB     (64<<10)       /* bound allocation */
  50 #define LNET_SINGLE_TEXTBUF_NOB  (4<<10)
  51
  52 #define SPACESTR " \t\v\r\n"
  53 #define DELIMITERS ":()[]"
  54
  55 static void
  56 lnet_syntax(const char *name, const char *str, int offset, int width)
  57 {
  58         static char dots[LNET_SINGLE_TEXTBUF_NOB];
  59         static char dashes[LNET_SINGLE_TEXTBUF_NOB];
  60
  61         memset(dots, '.', sizeof(dots));
  62         dots[sizeof(dots)-1] = 0;
  63         memset(dashes, '-', sizeof(dashes));
  64         dashes[sizeof(dashes)-1] = 0;
  65
  66         LCONSOLE_ERROR_MSG(0x10f, "Error parsing '%s=\"%s\"'\n", name, str);
  67         LCONSOLE_ERROR_MSG(0x110, "here...........%.*s..%.*s|%.*s|\n",
  68                            (int)strlen(name), dots, offset, dots,
  69                             (width < 1) ? 0 : width - 1, dashes);
  70 }
  71
  72 static int
  73 lnet_issep (char c)
  74 {
  75         switch (c) {
  76         case '\n':
  77         case '\r':
  78         case ';':
  79                 return 1;
  80         default:
  81                 return 0;
  82         }
  83 }
  84
  85 bool
  86 lnet_net_unique(__u32 net_id, struct list_head *netlist,
  87                 struct lnet_net **net)
  88 {
  89         struct lnet_net  *net_l;
  90
  91         if (!netlist)
  92                 return true;
  93
  94         list_for_each_entry(net_l, netlist, net_list) {
  95                 if (net_l->net_id == net_id) {
  96                         if (net != NULL)
  97                                 *net = net_l;
  98                         return false;
  99                 }
 100         }
 101
 102         return true;
 103 }
 104
 105 /* check that the NI is unique within the list of NIs already added to
 106  * a network */
 107 bool
 108 lnet_ni_unique_net(struct list_head *nilist, char *iface)
 109 {
 110         struct list_head *tmp;
 111         struct lnet_ni *ni;
 112
 113         list_for_each(tmp, nilist) {
 114                 ni = list_entry(tmp, struct lnet_ni, ni_netlist);
 115
 116                 if (ni->ni_interfaces[0] != NULL &&
 117                     strncmp(ni->ni_interfaces[0], iface, strlen(iface)) == 0)
 118                         return false;
 119         }
 120
 121         return true;
 122 }
 123
 124 /* check that the NI is unique to the interfaces with in the same NI.
 125  * This is only a consideration if use_tcp_bonding is set */
 126 static bool
 127 lnet_ni_unique_ni(char *iface_list[LNET_INTERFACES_NUM], char *iface)
 128 {
 129         int i;
 130         for (i = 0; i < LNET_INTERFACES_NUM; i++) {
 131                 if (iface_list[i] != NULL &&
 132                     strncmp(iface_list[i], iface, strlen(iface)) == 0)
 133                         return false;
 134         }
 135
 136         return true;
 137 }
 138
 139 static bool
 140 in_array(__u32 *array, __u32 size, __u32 value)
 141 {
 142         int i;
 143
 144         for (i = 0; i < size; i++) {
 145                 if (array[i] == value)
 146                         return false;
 147         }
 148
 149         return true;
 150 }
 151
 152 static int
 153 lnet_net_append_cpts(__u32 *cpts, __u32 ncpts, struct lnet_net *net)
 154 {
 155         __u32 *added_cpts = NULL;
 156         int i, j = 0, rc = 0;
 157
 158         /*
 159          * no need to go futher since a subset of the NIs already exist on
 160          * all CPTs
 161          */
 162         if (net->net_ncpts == LNET_CPT_NUMBER)
 163                 return 0;
 164
 165         if (cpts == NULL) {
 166                 /* there is an NI which will exist on all CPTs */
 167                 if (net->net_cpts != NULL)
 168                         LIBCFS_FREE(net->net_cpts, sizeof(*net->net_cpts) *
 169                                     net->net_ncpts);
 170                 net->net_cpts = NULL;
 171                 net->net_ncpts = LNET_CPT_NUMBER;
 172                 return 0;
 173         }
 174
 175         if (net->net_cpts == NULL) {
 176                 LIBCFS_ALLOC(net->net_cpts, sizeof(*net->net_cpts) * ncpts);
 177                 if (net->net_cpts == NULL)
 178                         return -ENOMEM;
 179                 memcpy(net->net_cpts, cpts, ncpts * sizeof(*net->net_cpts));
 180                 net->net_ncpts = ncpts;
 181                 return 0;
 182         }
 183
 184         LIBCFS_ALLOC(added_cpts, sizeof(*added_cpts) * LNET_CPT_NUMBER);
 185         if (added_cpts == NULL)
 186                 return -ENOMEM;
 187
 188         for (i = 0; i < ncpts; i++) {
 189                 if (!in_array(net->net_cpts, net->net_ncpts, cpts[i])) {
 190                         added_cpts[j] = cpts[i];
 191                         j++;
 192                 }
 193         }
 194
 195         /* append the new cpts if any to the list of cpts in the net */
 196         if (j > 0) {
 197                 __u32 *array = NULL, *loc;
 198                 __u32 total_entries = j + net->net_ncpts;
 199
 200                 LIBCFS_ALLOC(array, sizeof(*net->net_cpts) * total_entries);
 201                 if (array == NULL) {
 202                         rc = -ENOMEM;
 203                         goto failed;
 204                 }
 205
 206                 memcpy(array, net->net_cpts, net->net_ncpts);
 207                 loc = array + net->net_ncpts;
 208                 memcpy(loc, added_cpts, j);
 209
 210                 LIBCFS_FREE(net->net_cpts, sizeof(*net->net_cpts) *
 211                             net->net_ncpts);
 212                 net->net_ncpts = total_entries;
 213                 net->net_cpts = array;
 214         }
 215
 216 failed:
 217         LIBCFS_FREE(added_cpts, sizeof(*added_cpts) * LNET_CPT_NUMBER);
 218
 219         return rc;
 220 }
 221
 222 static void
 223 lnet_net_remove_cpts(__u32 *cpts, __u32 ncpts, struct lnet_net *net)
 224 {
 225         struct lnet_ni *ni;
 226         int rc;
 227
 228         /*
 229          * Operation Assumption:
 230          *      This function is called after an NI has been removed from
 231          *      its parent net.
 232          *
 233          * if we're removing an NI which exists on all CPTs then
 234          * we have to check if any of the other NIs on this net also
 235          * exists on all CPTs. If none, then we need to build our Net CPT
 236          * list based on the remaining NIs.
 237          *
 238          * If the NI being removed exist on a subset of the CPTs then we
 239          * alo rebuild the Net CPT list based on the remaining NIs, which
 240          * should resutl in the expected Net CPT list.
 241          */
 242
 243         /*
 244          * sometimes this function can be called due to some failure
 245          * creating an NI, before any of the cpts are allocated, so check
 246          * for that case and don't do anything
 247          */
 248         if (ncpts == 0)
 249                 return;
 250
 251         if (ncpts == LNET_CPT_NUMBER) {
 252                 /*
 253                  * first iteration through the NI list in the net to see
 254                  * if any of the NIs exist on all the CPTs. If one is
 255                  * found then our job is done.
 256                  */
 257                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
 258                         if (ni->ni_ncpts == LNET_CPT_NUMBER)
 259                                 return;
 260                 }
 261         }
 262
 263         /*
 264          * Rebuild the Net CPT list again, thereby only including only the
 265          * CPTs which the remaining NIs are associated with.
 266          */
 267         if (net->net_cpts != NULL) {
 268                 LIBCFS_FREE(net->net_cpts,
 269                         sizeof(*net->net_cpts) * net->net_ncpts);
 270                 net->net_cpts = NULL;
 271         }
 272
 273         list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
 274                 rc = lnet_net_append_cpts(ni->ni_cpts, ni->ni_ncpts,
 275                                           net);
 276                 if (rc != 0) {
 277                         CERROR("Out of Memory\n");
 278                         /*
 279                          * do our best to keep on going. Delete
 280                          * the net cpts and set it to NULL. This
 281                          * way we can keep on going but less
 282                          * efficiently, since memory accesses might be
 283                          * accross CPT lines.
 284                          */
 285                         if (net->net_cpts != NULL) {
 286                                 LIBCFS_FREE(net->net_cpts,
 287                                                 sizeof(*net->net_cpts) *
 288                                                 net->net_ncpts);
 289                                 net->net_cpts = NULL;
 290                                 net->net_ncpts = LNET_CPT_NUMBER;
 291                         }
 292                         return;
 293                 }
 294         }
 295 }
 296
 297 void
 298 lnet_ni_free(struct lnet_ni *ni)
 299 {
 300         int i;
 301
 302         lnet_net_remove_cpts(ni->ni_cpts, ni->ni_ncpts, ni->ni_net);
 303
 304         if (ni->ni_refs != NULL)
 305                 cfs_percpt_free(ni->ni_refs);
 306
 307         if (ni->ni_tx_queues != NULL)
 308                 cfs_percpt_free(ni->ni_tx_queues);
 309
 310         if (ni->ni_cpts != NULL)
 311                 cfs_expr_list_values_free(ni->ni_cpts, ni->ni_ncpts);
 312
 313         for (i = 0; i < LNET_INTERFACES_NUM &&
 314                     ni->ni_interfaces[i] != NULL; i++) {
 315                 LIBCFS_FREE(ni->ni_interfaces[i],
 316                             strlen(ni->ni_interfaces[i]) + 1);
 317         }
 318
 319         /* release reference to net namespace */
 320         if (ni->ni_net_ns != NULL)
 321                 put_net(ni->ni_net_ns);
 322
 323         LIBCFS_FREE(ni, sizeof(*ni));
 324 }
 325
 326 void
 327 lnet_net_free(struct lnet_net *net)
 328 {
 329         struct list_head *tmp, *tmp2;
 330         struct lnet_ni *ni;
 331
 332         LASSERT(list_empty(&net->net_ni_zombie));
 333
 334         /*
 335          * delete any nis that haven't been added yet. This could happen
 336          * if there is a failure on net startup
 337          */
 338         list_for_each_safe(tmp, tmp2, &net->net_ni_added) {
 339                 ni = list_entry(tmp, struct lnet_ni, ni_netlist);
 340                 list_del_init(&ni->ni_netlist);
 341                 lnet_ni_free(ni);
 342         }
 343
 344         /* delete any nis which have been started. */
 345         list_for_each_safe(tmp, tmp2, &net->net_ni_list) {
 346                 ni = list_entry(tmp, struct lnet_ni, ni_netlist);
 347                 list_del_init(&ni->ni_netlist);
 348                 lnet_ni_free(ni);
 349         }
 350
 351         if (net->net_cpts != NULL)
 352                 LIBCFS_FREE(net->net_cpts,
 353                             sizeof(*net->net_cpts) * net->net_ncpts);
 354
 355         LIBCFS_FREE(net, sizeof(*net));
 356 }
 357
 358 struct lnet_net *
 359 lnet_net_alloc(__u32 net_id, struct list_head *net_list)
 360 {
 361         struct lnet_net         *net;
 362
 363         if (!lnet_net_unique(net_id, net_list, NULL)) {
 364                 CERROR("Duplicate net %s. Ignore\n",
 365                        libcfs_net2str(net_id));
 366                 return NULL;
 367         }
 368
 369         LIBCFS_ALLOC(net, sizeof(*net));
 370         if (net == NULL) {
 371                 CERROR("Out of memory creating network %s\n",
 372                        libcfs_net2str(net_id));
 373                 return NULL;
 374         }
 375
 376         INIT_LIST_HEAD(&net->net_list);
 377         INIT_LIST_HEAD(&net->net_ni_list);
 378         INIT_LIST_HEAD(&net->net_ni_added);
 379         INIT_LIST_HEAD(&net->net_ni_zombie);
 380
 381         net->net_id = net_id;
 382         net->net_state = LNET_NET_STATE_INIT;
 383
 384         /* initialize global paramters to undefiend */
 385         net->net_tunables.lct_peer_timeout = -1;
 386         net->net_tunables.lct_max_tx_credits = -1;
 387         net->net_tunables.lct_peer_tx_credits = -1;
 388         net->net_tunables.lct_peer_rtr_credits = -1;
 389
 390         if (net_list)
 391                 list_add_tail(&net->net_list, net_list);
 392
 393         return net;
 394 }
 395
 396 static int
 397 lnet_ni_add_interface(struct lnet_ni *ni, char *iface)
 398 {
 399         int niface = 0;
 400
 401         if (ni == NULL)
 402                 return -ENOMEM;
 403
 404         if (!lnet_ni_unique_ni(ni->ni_interfaces, iface))
 405                 return -EINVAL;
 406
 407         /* Allocate a separate piece of memory and copy
 408          * into it the string, so we don't have
 409          * a depencency on the tokens string.  This way we
 410          * can free the tokens at the end of the function.
 411          * The newly allocated ni_interfaces[] can be
 412          * freed when freeing the NI */
 413         while (niface < LNET_INTERFACES_NUM &&
 414                ni->ni_interfaces[niface] != NULL)
 415                 niface++;
 416
 417         if (niface >= LNET_INTERFACES_NUM) {
 418                 LCONSOLE_ERROR_MSG(0x115, "Too many interfaces "
 419                                    "for net %s\n",
 420                                    libcfs_net2str(LNET_NIDNET(ni->ni_nid)));
 421                 return -EINVAL;
 422         }
 423
 424         LIBCFS_ALLOC(ni->ni_interfaces[niface],
 425                      strlen(iface) + 1);
 426
 427         if (ni->ni_interfaces[niface] == NULL) {
 428                 CERROR("Can't allocate net interface name\n");
 429                 return -ENOMEM;
 430         }
 431
 432         strncpy(ni->ni_interfaces[niface], iface,
 433                 strlen(iface) + 1);
 434
 435         return 0;
 436 }
 437
 438 static struct lnet_ni *
 439 lnet_ni_alloc_common(struct lnet_net *net, char *iface)
 440 {
 441         struct lnet_tx_queue    *tq;
 442         struct lnet_ni          *ni;
 443         int                     i;
 444
 445         if (iface != NULL)
 446                 /* make sure that this NI is unique in the net it's
 447                  * being added to */
 448                 if (!lnet_ni_unique_net(&net->net_ni_added, iface))
 449                         return NULL;
 450
 451         LIBCFS_ALLOC(ni, sizeof(*ni));
 452         if (ni == NULL) {
 453                 CERROR("Out of memory creating network interface %s%s\n",
 454                        libcfs_net2str(net->net_id),
 455                        (iface != NULL) ? iface : "");
 456                 return NULL;
 457         }
 458
 459         spin_lock_init(&ni->ni_lock);
 460         INIT_LIST_HEAD(&ni->ni_netlist);
 461         INIT_LIST_HEAD(&ni->ni_recovery);
 462         ni->ni_refs = cfs_percpt_alloc(lnet_cpt_table(),
 463                                        sizeof(*ni->ni_refs[0]));
 464         if (ni->ni_refs == NULL)
 465                 goto failed;
 466
 467         ni->ni_tx_queues = cfs_percpt_alloc(lnet_cpt_table(),
 468                                             sizeof(*ni->ni_tx_queues[0]));
 469         if (ni->ni_tx_queues == NULL)
 470                 goto failed;
 471
 472         cfs_percpt_for_each(tq, i, ni->ni_tx_queues)
 473                 INIT_LIST_HEAD(&tq->tq_delayed);
 474
 475         ni->ni_net = net;
 476         /* LND will fill in the address part of the NID */
 477         ni->ni_nid = LNET_MKNID(net->net_id, 0);
 478
 479         /* Store net namespace in which current ni is being created */
 480         if (current->nsproxy->net_ns != NULL)
 481                 ni->ni_net_ns = get_net(current->nsproxy->net_ns);
 482         else
 483                 ni->ni_net_ns = NULL;
 484
 485         ni->ni_last_alive = ktime_get_real_seconds();
 486         ni->ni_state = LNET_NI_STATE_INIT;
 487         list_add_tail(&ni->ni_netlist, &net->net_ni_added);
 488
 489         /*
 490          * if an interface name is provided then make sure to add in that
 491          * interface name in NI
 492          */
 493         if (iface)
 494                 if (lnet_ni_add_interface(ni, iface) != 0)
 495                         goto failed;
 496
 497         return ni;
 498 failed:
 499         lnet_ni_free(ni);
 500         return NULL;
 501 }
 502
 503 /* allocate and add to the provided network */
 504 struct lnet_ni *
 505 lnet_ni_alloc(struct lnet_net *net, struct cfs_expr_list *el, char *iface)
 506 {
 507         struct lnet_ni          *ni;
 508         int                     rc;
 509
 510         ni = lnet_ni_alloc_common(net, iface);
 511         if (!ni)
 512                 return NULL;
 513
 514         if (!el) {
 515                 ni->ni_cpts  = NULL;
 516                 ni->ni_ncpts = LNET_CPT_NUMBER;
 517         } else {
 518                 rc = cfs_expr_list_values(el, LNET_CPT_NUMBER, &ni->ni_cpts);
 519                 if (rc <= 0) {
 520                         CERROR("Failed to set CPTs for NI %s(%s): %d\n",
 521                                libcfs_net2str(net->net_id),
 522                                (iface != NULL) ? iface : "", rc);
 523                         goto failed;
 524                 }
 525
 526                 LASSERT(rc <= LNET_CPT_NUMBER);
 527                 if (rc == LNET_CPT_NUMBER) {
 528                         LIBCFS_FREE(ni->ni_cpts, rc * sizeof(ni->ni_cpts[0]));
 529                         ni->ni_cpts = NULL;
 530                 }
 531
 532                 ni->ni_ncpts = rc;
 533         }
 534
 535         rc = lnet_net_append_cpts(ni->ni_cpts, ni->ni_ncpts, net);
 536         if (rc != 0)
 537                 goto failed;
 538
 539         return ni;
 540 failed:
 541         lnet_ni_free(ni);
 542         return NULL;
 543 }
 544
 545 struct lnet_ni *
 546 lnet_ni_alloc_w_cpt_array(struct lnet_net *net, __u32 *cpts, __u32 ncpts,
 547                           char *iface)
 548 {
 549         struct lnet_ni          *ni;
 550         int                     rc;
 551
 552         ni = lnet_ni_alloc_common(net, iface);
 553         if (!ni)
 554                 return NULL;
 555
 556         if (ncpts == 0) {
 557                 ni->ni_cpts  = NULL;
 558                 ni->ni_ncpts = LNET_CPT_NUMBER;
 559         } else {
 560                 size_t array_size = ncpts * sizeof(ni->ni_cpts[0]);
 561                 LIBCFS_ALLOC(ni->ni_cpts, array_size);
 562                 if (ni->ni_cpts == NULL)
 563                         goto failed;
 564                 memcpy(ni->ni_cpts, cpts, array_size);
 565                 ni->ni_ncpts = ncpts;
 566         }
 567
 568         rc = lnet_net_append_cpts(ni->ni_cpts, ni->ni_ncpts, net);
 569         if (rc != 0)
 570                 goto failed;
 571
 572         return ni;
 573 failed:
 574         lnet_ni_free(ni);
 575         return NULL;
 576 }
 577
 578 /*
 579  * Parse the networks string and create the matching set of NIs on the
 580  * nilist.
 581  */
 582 int
 583 lnet_parse_networks(struct list_head *netlist, char *networks,
 584                     bool use_tcp_bonding)
 585 {
 586         struct cfs_expr_list *net_el = NULL;
 587         struct cfs_expr_list *ni_el = NULL;
 588         int             tokensize;
 589         char            *tokens;
 590         char            *str;
 591         struct lnet_net *net;
 592         struct lnet_ni  *ni = NULL;
 593         __u32           net_id;
 594         int             nnets = 0;
 595
 596         if (networks == NULL) {
 597                 CERROR("networks string is undefined\n");
 598                 return -EINVAL;
 599         }
 600
 601         if (strlen(networks) > LNET_SINGLE_TEXTBUF_NOB) {
 602                 /* _WAY_ conservative */
 603                 LCONSOLE_ERROR_MSG(0x112, "Can't parse networks: string too "
 604                                    "long\n");
 605                 return -EINVAL;
 606         }
 607
 608         tokensize = strlen(networks) + 1;
 609
 610         LIBCFS_ALLOC(tokens, tokensize);
 611         if (tokens == NULL) {
 612                 CERROR("Can't allocate net tokens\n");
 613                 return -ENOMEM;
 614         }
 615
 616         memcpy(tokens, networks, tokensize);
 617         str = tokens;
 618
 619         /*
 620          * Main parser loop.
 621          *
 622          * NB we don't check interface conflicts here; it's the LNDs
 623          * responsibility (if it cares at all)
 624          */
 625         do {
 626                 char *nistr;
 627                 char *elstr;
 628                 char *name;
 629                 int rc;
 630
 631                 /*
 632                  * Parse a network string into its components.
 633                  *
 634                  * <name>{"("...")"}{"["<el>"]"}
 635                  */
 636
 637                 /* Network name (mandatory) */
 638                 while (isspace(*str))
 639                         *str++ = '\0';
 640                 if (!*str)
 641                         break;
 642                 name = str;
 643                 str += strcspn(str, SPACESTR ":()[],");
 644                 while (isspace(*str))
 645                         *str++ = '\0';
 646
 647                 /* Interface list (optional) */
 648                 if (*str == '(') {
 649                         *str++ = '\0';
 650                         nistr = str;
 651                         str += strcspn(str, ")");
 652                         if (*str != ')') {
 653                                 str = nistr;
 654                                 goto failed_syntax;
 655                         }
 656                         do {
 657                                 *str++ = '\0';
 658                         } while (isspace(*str));
 659                 } else {
 660                         nistr = NULL;
 661                 }
 662
 663                 /* CPT expression (optional) */
 664                 if (*str == '[') {
 665                         elstr = str;
 666                         str += strcspn(str, "]");
 667                         if (*str != ']') {
 668                                 str = elstr;
 669                                 goto failed_syntax;
 670                         }
 671                         rc = cfs_expr_list_parse(elstr, str - elstr + 1,
 672                                                 0, LNET_CPT_NUMBER - 1,
 673                                                 &net_el);
 674                         if (rc != 0) {
 675                                 str = elstr;
 676                                 goto failed_syntax;
 677                         }
 678                         *elstr = '\0';
 679                         do {
 680                                 *str++ = '\0';
 681                         } while (isspace(*str));
 682                 }
 683
 684                 /* Bad delimiters */
 685                 if (*str && (strchr(DELIMITERS, *str) != NULL))
 686                         goto failed_syntax;
 687
 688                 /* go to the next net if it exits */
 689                 str += strcspn(str, ",");
 690                 if (*str == ',')
 691                         *str++ = '\0';
 692
 693                 /*
 694                  * At this point the name is properly terminated.
 695                  */
 696                 net_id = libcfs_str2net(name);
 697                 if (net_id == LNET_NIDNET(LNET_NID_ANY)) {
 698                         LCONSOLE_ERROR_MSG(0x113,
 699                                         "Unrecognised network type\n");
 700                         str = name;
 701                         goto failed_syntax;
 702                 }
 703
 704                 if (LNET_NETTYP(net_id) == LOLND) {
 705                         /* Loopback is implicit, and there can be only one. */
 706                         if (net_el) {
 707                                 cfs_expr_list_free(net_el);
 708                                 net_el = NULL;
 709                         }
 710                         /* Should we error out instead? */
 711                         continue;
 712                 }
 713
 714                 /*
 715                  * All network paramaters are now known.
 716                  */
 717                 nnets++;
 718
 719                 /* always allocate a net, since we will eventually add an
 720                  * interface to it, or we will fail, in which case we'll
 721                  * just delete it */
 722                 net = lnet_net_alloc(net_id, netlist);
 723                 if (IS_ERR_OR_NULL(net))
 724                         goto failed;
 725
 726                 if (!nistr ||
 727                     (use_tcp_bonding && LNET_NETTYP(net_id) == SOCKLND)) {
 728                         /*
 729                          * No interface list was specified, allocate a
 730                          * ni using the defaults.
 731                          */
 732                         ni = lnet_ni_alloc(net, net_el, NULL);
 733                         if (IS_ERR_OR_NULL(ni))
 734                                 goto failed;
 735
 736                         if (!nistr) {
 737                                 if (net_el) {
 738                                         cfs_expr_list_free(net_el);
 739                                         net_el = NULL;
 740                                 }
 741                                 continue;
 742                         }
 743                 }
 744
 745                 do {
 746                         elstr = NULL;
 747
 748                         /* Interface name (mandatory) */
 749                         while (isspace(*nistr))
 750                                 *nistr++ = '\0';
 751                         name = nistr;
 752                         nistr += strcspn(nistr, SPACESTR "[],");
 753                         while (isspace(*nistr))
 754                                 *nistr++ = '\0';
 755
 756                         /* CPT expression (optional) */
 757                         if (*nistr == '[') {
 758                                 elstr = nistr;
 759                                 nistr += strcspn(nistr, "]");
 760                                 if (*nistr != ']') {
 761                                         str = elstr;
 762                                         goto failed_syntax;
 763                                 }
 764                                 rc = cfs_expr_list_parse(elstr,
 765                                                         nistr - elstr + 1,
 766                                                         0, LNET_CPT_NUMBER - 1,
 767                                                         &ni_el);
 768                                 if (rc != 0) {
 769                                         str = elstr;
 770                                         goto failed_syntax;
 771                                 }
 772                                 *elstr = '\0';
 773                                 do {
 774                                         *nistr++ = '\0';
 775                                 } while (isspace(*nistr));
 776                         } else {
 777                                 ni_el = net_el;
 778                         }
 779
 780                         /*
 781                          * End of single interface specificaton,
 782                          * advance to the start of the next one, if
 783                          * any.
 784                          */
 785                         if (*nistr == ',') {
 786                                 do {
 787                                         *nistr++ = '\0';
 788                                 } while (isspace(*nistr));
 789                                 if (!*nistr) {
 790                                         str = nistr;
 791                                         goto failed_syntax;
 792                                 }
 793                         } else if (*nistr) {
 794                                 str = nistr;
 795                                 goto failed_syntax;
 796                         }
 797
 798                         /*
 799                          * At this point the name is properly terminated.
 800                          */
 801                         if (!*name) {
 802                                 str = name;
 803                                 goto failed_syntax;
 804                         }
 805
 806                         if (use_tcp_bonding &&
 807                             LNET_NETTYP(net->net_id) == SOCKLND) {
 808                                 rc = lnet_ni_add_interface(ni, name);
 809                                 if (rc != 0)
 810                                         goto failed;
 811                         } else {
 812                                 ni = lnet_ni_alloc(net, ni_el, name);
 813                                 if (IS_ERR_OR_NULL(ni))
 814                                         goto failed;
 815                         }
 816
 817                         if (ni_el) {
 818                                 if (ni_el != net_el) {
 819                                         cfs_expr_list_free(ni_el);
 820                                         ni_el = NULL;
 821                                 }
 822                         }
 823                 } while (*nistr);
 824
 825                 if (net_el) {
 826                         cfs_expr_list_free(net_el);
 827                         net_el = NULL;
 828                 }
 829         } while (*str);
 830
 831         LIBCFS_FREE(tokens, tokensize);
 832         return nnets;
 833
 834  failed_syntax:
 835         lnet_syntax("networks", networks, (int)(str - tokens), strlen(str));
 836  failed:
 837         /* free the net list and all the nis on each net */
 838         while (!list_empty(netlist)) {
 839                 net = list_entry(netlist->next, struct lnet_net, net_list);
 840
 841                 list_del_init(&net->net_list);
 842                 lnet_net_free(net);
 843         }
 844
 845         if (ni_el && ni_el != net_el)
 846                 cfs_expr_list_free(ni_el);
 847         if (net_el)
 848                 cfs_expr_list_free(net_el);
 849
 850         LIBCFS_FREE(tokens, tokensize);
 851
 852         return -EINVAL;
 853 }
 854
 855 static struct lnet_text_buf *lnet_new_text_buf(int str_len)
 856 {
 857         struct lnet_text_buf *ltb;
 858         int nob;
 859
 860         /* NB allocate space for the terminating 0 */
 861         nob = offsetof(struct lnet_text_buf, ltb_text[str_len + 1]);
 862         if (nob > LNET_SINGLE_TEXTBUF_NOB) {
 863                 /* _way_ conservative for "route net gateway..." */
 864                 CERROR("text buffer too big\n");
 865                 return NULL;
 866         }
 867
 868         if (lnet_tbnob + nob > LNET_MAX_TEXTBUF_NOB) {
 869                 CERROR("Too many text buffers\n");
 870                 return NULL;
 871         }
 872
 873         LIBCFS_ALLOC(ltb, nob);
 874         if (ltb == NULL)
 875                 return NULL;
 876
 877         ltb->ltb_size = nob;
 878         ltb->ltb_text[0] = 0;
 879         lnet_tbnob += nob;
 880         return ltb;
 881 }
 882
 883 static void
 884 lnet_free_text_buf(struct lnet_text_buf *ltb)
 885 {
 886         lnet_tbnob -= ltb->ltb_size;
 887         LIBCFS_FREE(ltb, ltb->ltb_size);
 888 }
 889
 890 static void
 891 lnet_free_text_bufs(struct list_head *tbs)
 892 {
 893         struct lnet_text_buf  *ltb;
 894
 895         while (!list_empty(tbs)) {
 896                 ltb = list_entry(tbs->next, struct lnet_text_buf, ltb_list);
 897
 898                 list_del(&ltb->ltb_list);
 899                 lnet_free_text_buf(ltb);
 900         }
 901 }
 902
 903 void
 904 lnet_print_text_bufs(struct list_head *tbs)
 905 {
 906         struct list_head *tmp;
 907         struct lnet_text_buf  *ltb;
 908
 909         list_for_each(tmp, tbs) {
 910                 ltb = list_entry(tmp, struct lnet_text_buf, ltb_list);
 911
 912                 CDEBUG(D_WARNING, "%s\n", ltb->ltb_text);
 913         }
 914
 915         CDEBUG(D_WARNING, "%d allocated\n", lnet_tbnob);
 916 }
 917
 918 static int
 919 lnet_str2tbs_sep(struct list_head *tbs, char *str)
 920 {
 921         struct list_head  pending;
 922         char             *sep;
 923         int               nob;
 924         int               i;
 925         struct lnet_text_buf  *ltb;
 926
 927         INIT_LIST_HEAD(&pending);
 928
 929         /* Split 'str' into separate commands */
 930         for (;;) {
 931                 /* skip leading whitespace */
 932                 while (isspace(*str))
 933                         str++;
 934
 935                 /* scan for separator or comment */
 936                 for (sep = str; *sep != 0; sep++)
 937                         if (lnet_issep(*sep) || *sep == '#')
 938                                 break;
 939
 940                 nob = (int)(sep - str);
 941                 if (nob > 0) {
 942                         ltb = lnet_new_text_buf(nob);
 943                         if (ltb == NULL) {
 944                                 lnet_free_text_bufs(&pending);
 945                                 return -ENOMEM;
 946                         }
 947
 948                         for (i = 0; i < nob; i++)
 949                                 if (isspace(str[i]))
 950                                         ltb->ltb_text[i] = ' ';
 951                                 else
 952                                         ltb->ltb_text[i] = str[i];
 953
 954                         ltb->ltb_text[nob] = 0;
 955
 956                         list_add_tail(&ltb->ltb_list, &pending);
 957                 }
 958
 959                 if (*sep == '#') {
 960                         /* scan for separator */
 961                         do {
 962                                 sep++;
 963                         } while (*sep != 0 && !lnet_issep(*sep));
 964                 }
 965
 966                 if (*sep == 0)
 967                         break;
 968
 969                 str = sep + 1;
 970         }
 971
 972         list_splice(&pending, tbs->prev);
 973         return 0;
 974 }
 975
 976 static int
 977 lnet_expand1tb(struct list_head *list,
 978                char *str, char *sep1, char *sep2,
 979                char *item, int itemlen)
 980 {
 981         int              len1 = (int)(sep1 - str);
 982         int              len2 = strlen(sep2 + 1);
 983         struct lnet_text_buf *ltb;
 984
 985         LASSERT (*sep1 == '[');
 986         LASSERT (*sep2 == ']');
 987
 988         ltb = lnet_new_text_buf(len1 + itemlen + len2);
 989         if (ltb == NULL)
 990                 return -ENOMEM;
 991
 992         memcpy(ltb->ltb_text, str, len1);
 993         memcpy(&ltb->ltb_text[len1], item, itemlen);
 994         memcpy(&ltb->ltb_text[len1+itemlen], sep2 + 1, len2);
 995         ltb->ltb_text[len1 + itemlen + len2] = 0;
 996
 997         list_add_tail(&ltb->ltb_list, list);
 998         return 0;
 999 }
1000
1001 static int
1002 lnet_str2tbs_expand(struct list_head *tbs, char *str)
1003 {
1004         char              num[16];
1005         struct list_head  pending;
1006         char             *sep;
1007         char             *sep2;
1008         char             *parsed;
1009         char             *enditem;
1010         int               lo;
1011         int               hi;
1012         int               stride;
1013         int               i;
1014         int               nob;
1015         int               scanned;
1016
1017         INIT_LIST_HEAD(&pending);
1018
1019         sep = strchr(str, '[');
1020         if (sep == NULL)                        /* nothing to expand */
1021                 return 0;
1022
1023         sep2 = strchr(sep, ']');
1024         if (sep2 == NULL)
1025                 goto failed;
1026
1027         for (parsed = sep; parsed < sep2; parsed = enditem) {
1028
1029                 enditem = ++parsed;
1030                 while (enditem < sep2 && *enditem != ',')
1031                         enditem++;
1032
1033                 if (enditem == parsed)          /* no empty items */
1034                         goto failed;
1035
1036                 if (sscanf(parsed, "%d-%d/%d%n", &lo, &hi, &stride, &scanned) < 3) {
1037
1038                         if (sscanf(parsed, "%d-%d%n", &lo, &hi, &scanned) < 2) {
1039
1040                                 /* simple string enumeration */
1041                                 if (lnet_expand1tb(&pending, str, sep, sep2,
1042                                                    parsed, (int)(enditem - parsed)) != 0)
1043                                         goto failed;
1044
1045                                 continue;
1046                         }
1047
1048                         stride = 1;
1049                 }
1050
1051                 /* range expansion */
1052
1053                 if (enditem != parsed + scanned) /* no trailing junk */
1054                         goto failed;
1055
1056                 if (hi < 0 || lo < 0 || stride < 0 || hi < lo ||
1057                     (hi - lo) % stride != 0)
1058                         goto failed;
1059
1060                 for (i = lo; i <= hi; i += stride) {
1061
1062                         snprintf(num, sizeof(num), "%d", i);
1063                         nob = strlen(num);
1064                         if (nob + 1 == sizeof(num))
1065                                 goto failed;
1066
1067                         if (lnet_expand1tb(&pending, str, sep, sep2,
1068                                            num, nob) != 0)
1069                                 goto failed;
1070                 }
1071         }
1072
1073         list_splice(&pending, tbs->prev);
1074         return 1;
1075
1076  failed:
1077         lnet_free_text_bufs(&pending);
1078         return -EINVAL;
1079 }
1080
1081 static int
1082 lnet_parse_hops (char *str, unsigned int *hops)
1083 {
1084         int     len = strlen(str);
1085         int     nob = len;
1086
1087         return (sscanf(str, "%u%n", hops, &nob) >= 1 &&
1088                 nob == len &&
1089                 *hops > 0 && *hops < 256);
1090 }
1091
1092 #define LNET_PRIORITY_SEPARATOR (':')
1093
1094 static int
1095 lnet_parse_priority(char *str, unsigned int *priority, char **token)
1096 {
1097         int   nob;
1098         char *sep;
1099         int   len;
1100
1101         sep = strchr(str, LNET_PRIORITY_SEPARATOR);
1102         if (sep == NULL) {
1103                 *priority = 0;
1104                 return 0;
1105         }
1106         len = strlen(sep + 1);
1107
1108         if ((sscanf((sep+1), "%u%n", priority, &nob) < 1) || (len != nob)) {
1109                 /* Update the caller's token pointer so it treats the found
1110                    priority as the token to report in the error message. */
1111                 *token += sep - str + 1;
1112                 return -EINVAL;
1113         }
1114
1115         CDEBUG(D_NET, "gateway %s, priority %d, nob %d\n", str, *priority, nob);
1116
1117         /*
1118          * Change priority separator to \0 to be able to parse NID
1119          */
1120         *sep = '\0';
1121         return 0;
1122 }
1123
1124 static int
1125 lnet_parse_route (char *str, int *im_a_router)
1126 {
1127         /* static scratch buffer OK (single threaded) */
1128         static char       cmd[LNET_SINGLE_TEXTBUF_NOB];
1129
1130         struct list_head  nets;
1131         struct list_head  gateways;
1132         struct list_head *tmp1;
1133         struct list_head *tmp2;
1134         __u32             net;
1135         lnet_nid_t        nid;
1136         struct lnet_text_buf  *ltb;
1137         int               rc;
1138         char             *sep;
1139         char             *token = str;
1140         int               ntokens = 0;
1141         int               myrc = -1;
1142         __u32             hops;
1143         int               got_hops = 0;
1144         unsigned int      priority = 0;
1145
1146         INIT_LIST_HEAD(&gateways);
1147         INIT_LIST_HEAD(&nets);
1148
1149         /* save a copy of the string for error messages */
1150         strncpy(cmd, str, sizeof(cmd));
1151         cmd[sizeof(cmd) - 1] = '\0';
1152
1153         sep = str;
1154         for (;;) {
1155                 /* scan for token start */
1156                 while (isspace(*sep))
1157                         sep++;
1158                 if (*sep == 0) {
1159                         if (ntokens < (got_hops ? 3 : 2))
1160                                 goto token_error;
1161                         break;
1162                 }
1163
1164                 ntokens++;
1165                 token = sep++;
1166
1167                 /* scan for token end */
1168                 while (*sep != 0 && !isspace(*sep))
1169                         sep++;
1170                 if (*sep != 0)
1171                         *sep++ = 0;
1172
1173                 if (ntokens == 1) {
1174                         tmp2 = &nets;           /* expanding nets */
1175                 } else if (ntokens == 2 &&
1176                            lnet_parse_hops(token, &hops)) {
1177                         got_hops = 1;           /* got a hop count */
1178                         continue;
1179                 } else {
1180                         tmp2 = &gateways;       /* expanding gateways */
1181                 }
1182
1183                 ltb = lnet_new_text_buf(strlen(token));
1184                 if (ltb == NULL)
1185                         goto out;
1186
1187                 strcpy(ltb->ltb_text, token);
1188                 tmp1 = &ltb->ltb_list;
1189                 list_add_tail(tmp1, tmp2);
1190
1191                 while (tmp1 != tmp2) {
1192                         ltb = list_entry(tmp1, struct lnet_text_buf, ltb_list);
1193
1194                         rc = lnet_str2tbs_expand(tmp1->next, ltb->ltb_text);
1195                         if (rc < 0)
1196                                 goto token_error;
1197
1198                         tmp1 = tmp1->next;
1199
1200                         if (rc > 0) {           /* expanded! */
1201                                 list_del(&ltb->ltb_list);
1202                                 lnet_free_text_buf(ltb);
1203                                 continue;
1204                         }
1205
1206                         if (ntokens == 1) {
1207                                 net = libcfs_str2net(ltb->ltb_text);
1208                                 if (net == LNET_NIDNET(LNET_NID_ANY) ||
1209                                     LNET_NETTYP(net) == LOLND)
1210                                         goto token_error;
1211                         } else {
1212                                 rc = lnet_parse_priority(ltb->ltb_text,
1213                                                          &priority, &token);
1214                                 if (rc < 0)
1215                                         goto token_error;
1216
1217                                 nid = libcfs_str2nid(ltb->ltb_text);
1218                                 if (nid == LNET_NID_ANY ||
1219                                     LNET_NETTYP(LNET_NIDNET(nid)) == LOLND)
1220                                         goto token_error;
1221                         }
1222                 }
1223         }
1224
1225         /* if there are no hops set then we want to flag this value as
1226          * unset since hops is an optional parameter */
1227         if (!got_hops)
1228                 hops = LNET_UNDEFINED_HOPS;
1229
1230         LASSERT(!list_empty(&nets));
1231         LASSERT(!list_empty(&gateways));
1232
1233         list_for_each(tmp1, &nets) {
1234                 ltb = list_entry(tmp1, struct lnet_text_buf, ltb_list);
1235                 net = libcfs_str2net(ltb->ltb_text);
1236                 LASSERT (net != LNET_NIDNET(LNET_NID_ANY));
1237
1238                 list_for_each(tmp2, &gateways) {
1239                         ltb = list_entry(tmp2, struct lnet_text_buf, ltb_list);
1240                         nid = libcfs_str2nid(ltb->ltb_text);
1241                         LASSERT(nid != LNET_NID_ANY);
1242
1243                         if (lnet_islocalnid(nid)) {
1244                                 *im_a_router = 1;
1245                                 continue;
1246                         }
1247
1248                         rc = lnet_add_route(net, hops, nid, priority);
1249                         if (rc != 0 && rc != -EEXIST && rc != -EHOSTUNREACH) {
1250                                 CERROR("Can't create route "
1251                                        "to %s via %s\n",
1252                                        libcfs_net2str(net),
1253                                        libcfs_nid2str(nid));
1254                                 goto out;
1255                         }
1256                 }
1257         }
1258
1259         myrc = 0;
1260         goto out;
1261
1262 token_error:
1263         lnet_syntax("routes", cmd, (int)(token - str), strlen(token));
1264 out:
1265         lnet_free_text_bufs(&nets);
1266         lnet_free_text_bufs(&gateways);
1267         return myrc;
1268 }
1269
1270 static int
1271 lnet_parse_route_tbs(struct list_head *tbs, int *im_a_router)
1272 {
1273         struct lnet_text_buf   *ltb;
1274
1275         while (!list_empty(tbs)) {
1276                 ltb = list_entry(tbs->next, struct lnet_text_buf, ltb_list);
1277
1278                 if (lnet_parse_route(ltb->ltb_text, im_a_router) < 0) {
1279                         lnet_free_text_bufs(tbs);
1280                         return -EINVAL;
1281                 }
1282
1283                 list_del(&ltb->ltb_list);
1284                 lnet_free_text_buf(ltb);
1285         }
1286
1287         return 0;
1288 }
1289
1290 int
1291 lnet_parse_routes (char *routes, int *im_a_router)
1292 {
1293         struct list_head tbs;
1294         int              rc = 0;
1295
1296         *im_a_router = 0;
1297
1298         INIT_LIST_HEAD(&tbs);
1299
1300         if (lnet_str2tbs_sep(&tbs, routes) < 0) {
1301                 CERROR("Error parsing routes\n");
1302                 rc = -EINVAL;
1303         } else {
1304                 rc = lnet_parse_route_tbs(&tbs, im_a_router);
1305         }
1306
1307         LASSERT (lnet_tbnob == 0);
1308         return rc;
1309 }
1310
1311 static int
1312 lnet_match_network_token(char *token, int len, __u32 *ipaddrs, int nip)
1313 {
1314         struct list_head list = LIST_HEAD_INIT(list);
1315         int             rc;
1316         int             i;
1317
1318         rc = cfs_ip_addr_parse(token, len, &list);
1319         if (rc != 0)
1320                 return rc;
1321
1322         for (rc = i = 0; !rc && i < nip; i++)
1323                 rc = cfs_ip_addr_match(ipaddrs[i], &list);
1324
1325         cfs_expr_list_free_list(&list);
1326
1327         return rc;
1328 }
1329
1330 static int
1331 lnet_match_network_tokens(char *net_entry, __u32 *ipaddrs, int nip)
1332 {
1333         static char tokens[LNET_SINGLE_TEXTBUF_NOB];
1334
1335         int   matched = 0;
1336         int   ntokens = 0;
1337         int   len;
1338         char *net = NULL;
1339         char *sep;
1340         char *token;
1341         int   rc;
1342
1343         LASSERT(strlen(net_entry) < sizeof(tokens));
1344
1345         /* work on a copy of the string */
1346         strcpy(tokens, net_entry);
1347         sep = tokens;
1348         for (;;) {
1349                 /* scan for token start */
1350                 while (isspace(*sep))
1351                         sep++;
1352                 if (*sep == 0)
1353                         break;
1354
1355                 token = sep++;
1356
1357                 /* scan for token end */
1358                 while (*sep != 0 && !isspace(*sep))
1359                         sep++;
1360                 if (*sep != 0)
1361                         *sep++ = 0;
1362
1363                 if (ntokens++ == 0) {
1364                         net = token;
1365                         continue;
1366                 }
1367
1368                 len = strlen(token);
1369
1370                 rc = lnet_match_network_token(token, len, ipaddrs, nip);
1371                 if (rc < 0) {
1372                         lnet_syntax("ip2nets", net_entry,
1373                                     (int)(token - tokens), len);
1374                         return rc;
1375                 }
1376
1377                 matched |= (rc != 0);
1378         }
1379
1380         if (!matched)
1381                 return 0;
1382
1383         strcpy(net_entry, net);                 /* replace with matched net */
1384         return 1;
1385 }
1386
1387 static __u32
1388 lnet_netspec2net(char *netspec)
1389 {
1390         char   *bracket = strchr(netspec, '(');
1391         __u32   net;
1392
1393         if (bracket != NULL)
1394                 *bracket = 0;
1395
1396         net = libcfs_str2net(netspec);
1397
1398         if (bracket != NULL)
1399                 *bracket = '(';
1400
1401         return net;
1402 }
1403
1404 static int
1405 lnet_splitnets(char *source, struct list_head *nets)
1406 {
1407         int               offset = 0;
1408         int               offset2;
1409         int               len;
1410         struct lnet_text_buf  *tb;
1411         struct lnet_text_buf  *tb2;
1412         struct list_head *t;
1413         char             *sep;
1414         char             *bracket;
1415         __u32             net;
1416
1417         LASSERT(!list_empty(nets));
1418         LASSERT(nets->next == nets->prev);      /* single entry */
1419
1420         tb = list_entry(nets->next, struct lnet_text_buf, ltb_list);
1421
1422         for (;;) {
1423                 sep = strchr(tb->ltb_text, ',');
1424                 bracket = strchr(tb->ltb_text, '(');
1425
1426                 if (sep != NULL &&
1427                     bracket != NULL &&
1428                     bracket < sep) {
1429                         /* netspec lists interfaces... */
1430
1431                         offset2 = offset + (int)(bracket - tb->ltb_text);
1432                         len = strlen(bracket);
1433
1434                         bracket = strchr(bracket + 1, ')');
1435
1436                         if (bracket == NULL ||
1437                             !(bracket[1] == ',' || bracket[1] == 0)) {
1438                                 lnet_syntax("ip2nets", source, offset2, len);
1439                                 return -EINVAL;
1440                         }
1441
1442                         sep = (bracket[1] == 0) ? NULL : bracket + 1;
1443                 }
1444
1445                 if (sep != NULL)
1446                         *sep++ = 0;
1447
1448                 net = lnet_netspec2net(tb->ltb_text);
1449                 if (net == LNET_NIDNET(LNET_NID_ANY)) {
1450                         lnet_syntax("ip2nets", source, offset,
1451                                     strlen(tb->ltb_text));
1452                         return -EINVAL;
1453                 }
1454
1455                 list_for_each(t, nets) {
1456                         tb2 = list_entry(t, struct lnet_text_buf, ltb_list);
1457
1458                         if (tb2 == tb)
1459                                 continue;
1460
1461                         if (net == lnet_netspec2net(tb2->ltb_text)) {
1462                                 /* duplicate network */
1463                                 lnet_syntax("ip2nets", source, offset,
1464                                             strlen(tb->ltb_text));
1465                                 return -EINVAL;
1466                         }
1467                 }
1468
1469                 if (sep == NULL)
1470                         return 0;
1471
1472                 offset += (int)(sep - tb->ltb_text);
1473                 len = strlen(sep);
1474                 tb2 = lnet_new_text_buf(len);
1475                 if (tb2 == NULL)
1476                         return -ENOMEM;
1477
1478                 strncpy(tb2->ltb_text, sep, len);
1479                 tb2->ltb_text[len] = '\0';
1480                 list_add_tail(&tb2->ltb_list, nets);
1481
1482                 tb = tb2;
1483         }
1484 }
1485
1486 static int
1487 lnet_match_networks (char **networksp, char *ip2nets, __u32 *ipaddrs, int nip)
1488 {
1489         static char       networks[LNET_SINGLE_TEXTBUF_NOB];
1490         static char       source[LNET_SINGLE_TEXTBUF_NOB];
1491
1492         struct list_head  raw_entries;
1493         struct list_head  matched_nets;
1494         struct list_head  current_nets;
1495         struct list_head *t;
1496         struct list_head *t2;
1497         struct lnet_text_buf  *tb;
1498         struct lnet_text_buf  *tb2;
1499         __u32             net1;
1500         __u32             net2;
1501         int               len;
1502         int               count;
1503         int               dup;
1504         int               rc;
1505
1506         INIT_LIST_HEAD(&raw_entries);
1507         if (lnet_str2tbs_sep(&raw_entries, ip2nets) < 0) {
1508                 CERROR("Error parsing ip2nets\n");
1509                 LASSERT(lnet_tbnob == 0);
1510                 return -EINVAL;
1511         }
1512
1513         INIT_LIST_HEAD(&matched_nets);
1514         INIT_LIST_HEAD(&current_nets);
1515         networks[0] = 0;
1516         count = 0;
1517         len = 0;
1518         rc = 0;
1519
1520         while (!list_empty(&raw_entries)) {
1521                 tb = list_entry(raw_entries.next, struct lnet_text_buf,
1522                                 ltb_list);
1523
1524                 strncpy(source, tb->ltb_text, sizeof(source));
1525                 source[sizeof(source) - 1] = '\0';
1526
1527                 /* replace ltb_text with the network(s) add on match */
1528                 rc = lnet_match_network_tokens(tb->ltb_text, ipaddrs, nip);
1529                 if (rc < 0)
1530                         break;
1531
1532                 list_del(&tb->ltb_list);
1533
1534                 if (rc == 0) {                  /* no match */
1535                         lnet_free_text_buf(tb);
1536                         continue;
1537                 }
1538
1539                 /* split into separate networks */
1540                 INIT_LIST_HEAD(&current_nets);
1541                 list_add(&tb->ltb_list, &current_nets);
1542                 rc = lnet_splitnets(source, &current_nets);
1543                 if (rc < 0)
1544                         break;
1545
1546                 dup = 0;
1547                 list_for_each(t, &current_nets) {
1548                         tb = list_entry(t, struct lnet_text_buf, ltb_list);
1549                         net1 = lnet_netspec2net(tb->ltb_text);
1550                         LASSERT(net1 != LNET_NIDNET(LNET_NID_ANY));
1551
1552                         list_for_each(t2, &matched_nets) {
1553                                 tb2 = list_entry(t2, struct lnet_text_buf,
1554                                                  ltb_list);
1555                                 net2 = lnet_netspec2net(tb2->ltb_text);
1556                                 LASSERT(net2 != LNET_NIDNET(LNET_NID_ANY));
1557
1558                                 if (net1 == net2) {
1559                                         dup = 1;
1560                                         break;
1561                                 }
1562                         }
1563
1564                         if (dup)
1565                                 break;
1566                 }
1567
1568                 if (dup) {
1569                         lnet_free_text_bufs(&current_nets);
1570                         continue;
1571                 }
1572
1573                 list_for_each_safe(t, t2, &current_nets) {
1574                         tb = list_entry(t, struct lnet_text_buf, ltb_list);
1575
1576                         list_del(&tb->ltb_list);
1577                         list_add_tail(&tb->ltb_list, &matched_nets);
1578
1579                         len += snprintf(networks + len, sizeof(networks) - len,
1580                                         "%s%s", (len == 0) ? "" : ",",
1581                                         tb->ltb_text);
1582
1583                         if (len >= sizeof(networks)) {
1584                                 CERROR("Too many matched networks\n");
1585                                 rc = -E2BIG;
1586                                 goto out;
1587                         }
1588                 }
1589
1590                 count++;
1591         }
1592
1593  out:
1594         lnet_free_text_bufs(&raw_entries);
1595         lnet_free_text_bufs(&matched_nets);
1596         lnet_free_text_bufs(&current_nets);
1597         LASSERT(lnet_tbnob == 0);
1598
1599         if (rc < 0)
1600                 return rc;
1601
1602         *networksp = networks;
1603         return count;
1604 }
1605
1606 static void
1607 lnet_ipaddr_free_enumeration(__u32 *ipaddrs, int nip)
1608 {
1609         LIBCFS_FREE(ipaddrs, nip * sizeof(*ipaddrs));
1610 }
1611
1612 static int
1613 lnet_ipaddr_enumerate(u32 **ipaddrsp)
1614 {
1615         struct net_device *dev;
1616         u32 *ipaddrs;
1617         int nalloc = 64;
1618         int nip = 0;
1619
1620         LIBCFS_ALLOC(ipaddrs, nalloc * sizeof(*ipaddrs));
1621         if (!ipaddrs) {
1622                 CERROR("Can't allocate ipaddrs[%d]\n", nalloc);
1623                 return -ENOMEM;
1624         }
1625
1626         rtnl_lock();
1627         for_each_netdev(&init_net, dev) {
1628                 struct in_device *in_dev;
1629
1630                 if (strcmp(dev->name, "lo") == 0)
1631                         continue;
1632
1633                 if (!(dev_get_flags(dev) & IFF_UP)) {
1634                         CWARN("Ignoring interface %s: it's down\n", dev->name);
1635                         continue;
1636                 }
1637
1638                 in_dev = __in_dev_get_rtnl(dev);
1639                 if (!in_dev) {
1640                         CWARN("Interface %s has no IPv4 status.\n", dev->name);
1641                         continue;
1642                 }
1643
1644                 if (nip >= nalloc) {
1645                         u32 *ipaddrs2;
1646
1647                         nalloc += nalloc;
1648                         ipaddrs2 = krealloc(ipaddrs, nalloc * sizeof(*ipaddrs2),
1649                                             GFP_KERNEL);
1650                         if (!ipaddrs2) {
1651                                 kfree(ipaddrs);
1652                                 CERROR("Can't allocate ipaddrs[%d]\n", nip);
1653                                 return -ENOMEM;
1654                         }
1655                         ipaddrs = ipaddrs2;
1656                 }
1657
1658                 for_primary_ifa(in_dev)
1659                         if (strcmp(ifa->ifa_label, dev->name) == 0) {
1660                                 ipaddrs[nip++] = ifa->ifa_local;
1661                                 break;
1662                         }
1663                 endfor_ifa(in_dev);
1664         }
1665         rtnl_unlock();
1666
1667         *ipaddrsp = ipaddrs;
1668         return nip;
1669 }
1670
1671 int
1672 lnet_parse_ip2nets (char **networksp, char *ip2nets)
1673 {
1674         __u32     *ipaddrs = NULL;
1675         int        nip = lnet_ipaddr_enumerate(&ipaddrs);
1676         int        rc;
1677
1678         if (nip < 0) {
1679                 LCONSOLE_ERROR_MSG(0x117, "Error %d enumerating local IP "
1680                                    "interfaces for ip2nets to match\n", nip);
1681                 return nip;
1682         }
1683
1684         if (nip == 0) {
1685                 LCONSOLE_ERROR_MSG(0x118, "No local IP interfaces "
1686                                    "for ip2nets to match\n");
1687                 return -ENOENT;
1688         }
1689
1690         rc = lnet_match_networks(networksp, ip2nets, ipaddrs, nip);
1691         lnet_ipaddr_free_enumeration(ipaddrs, nip);
1692
1693         if (rc < 0) {
1694                 LCONSOLE_ERROR_MSG(0x119, "Error %d parsing ip2nets\n", rc);
1695                 return rc;
1696         }
1697
1698         if (rc == 0) {
1699                 LCONSOLE_ERROR_MSG(0x11a, "ip2nets does not match "
1700                                    "any local IP interfaces\n");
1701                 return -ENOENT;
1702         }
1703
1704         return 0;
1705 }