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  */
  31
  32 #define DEBUG_SUBSYSTEM S_LNET
  33
  34 #include <linux/ctype.h>
  35 #include <linux/inetdevice.h>
  36 #include <linux/nsproxy.h>
  37 #include <net/net_namespace.h>
  38 #include <lnet/lib-lnet.h>
  39
  40 /* tmp struct for parsing routes */
  41 struct lnet_text_buf {
  42         struct list_head        ltb_list;       /* stash on lists */
  43         int                     ltb_size;       /* allocated size */
  44         char                    ltb_text[0];    /* text buffer */
  45 };
  46
  47 static int lnet_tbnob = 0;                      /* track text buf allocation */
  48 #define LNET_MAX_TEXTBUF_NOB     (64<<10)       /* bound allocation */
  49 #define LNET_SINGLE_TEXTBUF_NOB  (4<<10)
  50
  51 #define SPACESTR " \t\v\r\n"
  52 #define DELIMITERS ":()[]"
  53
  54 #ifndef HAVE_STRSCPY
  55 #define strscpy(s1, s2, sz)     strlcpy((s1), (s2), (sz))
  56 #endif
  57
  58 static void
  59 lnet_syntax(const char *name, const char *str, int offset, int width)
  60 {
  61         static char dots[LNET_SINGLE_TEXTBUF_NOB];
  62         static char dashes[LNET_SINGLE_TEXTBUF_NOB];
  63
  64         memset(dots, '.', sizeof(dots));
  65         dots[sizeof(dots)-1] = 0;
  66         memset(dashes, '-', sizeof(dashes));
  67         dashes[sizeof(dashes)-1] = 0;
  68
  69         LCONSOLE_ERROR_MSG(0x10f, "Error parsing '%s=\"%s\"'\n", name, str);
  70         LCONSOLE_ERROR_MSG(0x110, "here...........%.*s..%.*s|%.*s|\n",
  71                            (int)strlen(name), dots, offset, dots,
  72                             (width < 1) ? 0 : width - 1, dashes);
  73 }
  74
  75 static int
  76 lnet_issep (char c)
  77 {
  78         switch (c) {
  79         case '\n':
  80         case '\r':
  81         case ';':
  82                 return 1;
  83         default:
  84                 return 0;
  85         }
  86 }
  87
  88 bool
  89 lnet_net_unique(__u32 net_id, struct list_head *netlist,
  90                 struct lnet_net **net)
  91 {
  92         struct lnet_net  *net_l;
  93
  94         if (!netlist)
  95                 return true;
  96
  97         list_for_each_entry(net_l, netlist, net_list) {
  98                 if (net_l->net_id == net_id) {
  99                         if (net != NULL)
 100                                 *net = net_l;
 101                         return false;
 102                 }
 103         }
 104
 105         return true;
 106 }
 107
 108 /* check that the NI is unique within the list of NIs already added to
 109  * a network */
 110 bool
 111 lnet_ni_unique_net(struct list_head *nilist, char *iface)
 112 {
 113         struct list_head *tmp;
 114         struct lnet_ni *ni;
 115
 116         list_for_each(tmp, nilist) {
 117                 ni = list_entry(tmp, struct lnet_ni, ni_netlist);
 118
 119                 if (ni->ni_interface != NULL &&
 120                     strncmp(ni->ni_interface, iface, strlen(iface)) == 0)
 121                         return false;
 122         }
 123
 124         return true;
 125 }
 126 static bool
 127 in_array(__u32 *array, __u32 size, __u32 value)
 128 {
 129         int i;
 130
 131         for (i = 0; i < size; i++) {
 132                 if (array[i] == value)
 133                         return false;
 134         }
 135
 136         return true;
 137 }
 138
 139 static int
 140 lnet_net_append_cpts(__u32 *cpts, __u32 ncpts, struct lnet_net *net)
 141 {
 142         __u32 *added_cpts = NULL;
 143         int i, j = 0, rc = 0;
 144
 145         /*
 146          * no need to go futher since a subset of the NIs already exist on
 147          * all CPTs
 148          */
 149         if (net->net_ncpts == LNET_CPT_NUMBER)
 150                 return 0;
 151
 152         if (cpts == NULL) {
 153                 /* there is an NI which will exist on all CPTs */
 154                 if (net->net_cpts != NULL)
 155                         CFS_FREE_PTR_ARRAY(net->net_cpts, net->net_ncpts);
 156                 net->net_cpts = NULL;
 157                 net->net_ncpts = LNET_CPT_NUMBER;
 158                 return 0;
 159         }
 160
 161         if (net->net_cpts == NULL) {
 162                 CFS_ALLOC_PTR_ARRAY(net->net_cpts, ncpts);
 163                 if (net->net_cpts == NULL)
 164                         return -ENOMEM;
 165                 memcpy(net->net_cpts, cpts, ncpts * sizeof(*net->net_cpts));
 166                 net->net_ncpts = ncpts;
 167                 return 0;
 168         }
 169
 170         CFS_ALLOC_PTR_ARRAY(added_cpts, LNET_CPT_NUMBER);
 171         if (added_cpts == NULL)
 172                 return -ENOMEM;
 173
 174         for (i = 0; i < ncpts; i++) {
 175                 if (!in_array(net->net_cpts, net->net_ncpts, cpts[i])) {
 176                         added_cpts[j] = cpts[i];
 177                         j++;
 178                 }
 179         }
 180
 181         /* append the new cpts if any to the list of cpts in the net */
 182         if (j > 0) {
 183                 __u32 *array = NULL, *loc;
 184                 __u32 total_entries = j + net->net_ncpts;
 185
 186                 CFS_ALLOC_PTR_ARRAY(array, total_entries);
 187                 if (array == NULL) {
 188                         rc = -ENOMEM;
 189                         goto failed;
 190                 }
 191
 192                 memcpy(array, net->net_cpts,
 193                        net->net_ncpts * sizeof(*net->net_cpts));
 194                 loc = array + net->net_ncpts;
 195                 memcpy(loc, added_cpts, j * sizeof(*net->net_cpts));
 196
 197                 CFS_FREE_PTR_ARRAY(net->net_cpts, net->net_ncpts);
 198                 net->net_ncpts = total_entries;
 199                 net->net_cpts = array;
 200         }
 201
 202 failed:
 203         CFS_FREE_PTR_ARRAY(added_cpts, LNET_CPT_NUMBER);
 204
 205         return rc;
 206 }
 207
 208 static void
 209 lnet_net_remove_cpts(__u32 *cpts, __u32 ncpts, struct lnet_net *net)
 210 {
 211         struct lnet_ni *ni;
 212         int rc;
 213
 214         /*
 215          * Operation Assumption:
 216          *      This function is called after an NI has been removed from
 217          *      its parent net.
 218          *
 219          * if we're removing an NI which exists on all CPTs then
 220          * we have to check if any of the other NIs on this net also
 221          * exists on all CPTs. If none, then we need to build our Net CPT
 222          * list based on the remaining NIs.
 223          *
 224          * If the NI being removed exist on a subset of the CPTs then we
 225          * alo rebuild the Net CPT list based on the remaining NIs, which
 226          * should resutl in the expected Net CPT list.
 227          */
 228
 229         /*
 230          * sometimes this function can be called due to some failure
 231          * creating an NI, before any of the cpts are allocated, so check
 232          * for that case and don't do anything
 233          */
 234         if (ncpts == 0)
 235                 return;
 236
 237         if (ncpts == LNET_CPT_NUMBER) {
 238                 /*
 239                  * first iteration through the NI list in the net to see
 240                  * if any of the NIs exist on all the CPTs. If one is
 241                  * found then our job is done.
 242                  */
 243                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
 244                         if (ni->ni_ncpts == LNET_CPT_NUMBER)
 245                                 return;
 246                 }
 247         }
 248
 249         /*
 250          * Rebuild the Net CPT list again, thereby only including only the
 251          * CPTs which the remaining NIs are associated with.
 252          */
 253         if (net->net_cpts != NULL) {
 254                 CFS_FREE_PTR_ARRAY(net->net_cpts, net->net_ncpts);
 255                 net->net_cpts = NULL;
 256         }
 257
 258         list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
 259                 rc = lnet_net_append_cpts(ni->ni_cpts, ni->ni_ncpts,
 260                                           net);
 261                 if (rc != 0) {
 262                         CERROR("Out of Memory\n");
 263                         /*
 264                          * do our best to keep on going. Delete
 265                          * the net cpts and set it to NULL. This
 266                          * way we can keep on going but less
 267                          * efficiently, since memory accesses might be
 268                          * accross CPT lines.
 269                          */
 270                         if (net->net_cpts != NULL) {
 271                                 CFS_FREE_PTR_ARRAY(net->net_cpts,
 272                                                    net->net_ncpts);
 273                                 net->net_cpts = NULL;
 274                                 net->net_ncpts = LNET_CPT_NUMBER;
 275                         }
 276                         return;
 277                 }
 278         }
 279 }
 280
 281 void
 282 lnet_ni_free(struct lnet_ni *ni)
 283 {
 284         lnet_net_remove_cpts(ni->ni_cpts, ni->ni_ncpts, ni->ni_net);
 285
 286         if (ni->ni_refs != NULL)
 287                 cfs_percpt_free(ni->ni_refs);
 288
 289         if (ni->ni_tx_queues != NULL)
 290                 cfs_percpt_free(ni->ni_tx_queues);
 291
 292         if (ni->ni_cpts != NULL)
 293                 cfs_expr_list_values_free(ni->ni_cpts, ni->ni_ncpts);
 294
 295         if (ni->ni_interface != NULL) {
 296                 LIBCFS_FREE(ni->ni_interface,
 297                             strlen(ni->ni_interface) + 1);
 298         }
 299
 300         /* release reference to net namespace */
 301         if (ni->ni_net_ns != NULL)
 302                 put_net(ni->ni_net_ns);
 303
 304         LIBCFS_FREE(ni, sizeof(*ni));
 305 }
 306
 307 void
 308 lnet_net_free(struct lnet_net *net)
 309 {
 310         struct list_head *tmp, *tmp2;
 311         struct lnet_ni *ni;
 312
 313         LASSERT(list_empty(&net->net_ni_zombie));
 314
 315         /*
 316          * delete any nis that haven't been added yet. This could happen
 317          * if there is a failure on net startup
 318          */
 319         list_for_each_safe(tmp, tmp2, &net->net_ni_added) {
 320                 ni = list_entry(tmp, struct lnet_ni, ni_netlist);
 321                 list_del_init(&ni->ni_netlist);
 322                 lnet_ni_free(ni);
 323         }
 324
 325         /* delete any nis which have been started. */
 326         list_for_each_safe(tmp, tmp2, &net->net_ni_list) {
 327                 ni = list_entry(tmp, struct lnet_ni, ni_netlist);
 328                 list_del_init(&ni->ni_netlist);
 329                 lnet_ni_free(ni);
 330         }
 331
 332         if (net->net_cpts != NULL)
 333                 CFS_FREE_PTR_ARRAY(net->net_cpts, net->net_ncpts);
 334
 335         LIBCFS_FREE(net, sizeof(*net));
 336 }
 337
 338 struct lnet_net *
 339 lnet_net_alloc(__u32 net_id, struct list_head *net_list)
 340 {
 341         struct lnet_net         *net;
 342
 343         if (!lnet_net_unique(net_id, net_list, &net)) {
 344                 CDEBUG(D_NET, "Returning duplicate net %p %s\n", net,
 345                        libcfs_net2str(net->net_id));
 346                 return net;
 347         }
 348
 349         LIBCFS_ALLOC(net, sizeof(*net));
 350         if (net == NULL) {
 351                 CERROR("Out of memory creating network %s\n",
 352                        libcfs_net2str(net_id));
 353                 return NULL;
 354         }
 355
 356         INIT_LIST_HEAD(&net->net_list);
 357         INIT_LIST_HEAD(&net->net_ni_list);
 358         INIT_LIST_HEAD(&net->net_ni_added);
 359         INIT_LIST_HEAD(&net->net_ni_zombie);
 360         INIT_LIST_HEAD(&net->net_rtr_pref_nids);
 361         spin_lock_init(&net->net_lock);
 362
 363         net->net_id = net_id;
 364         net->net_last_alive = ktime_get_seconds();
 365
 366         net->net_sel_priority = LNET_MAX_SELECTION_PRIORITY;
 367
 368         /* initialize global paramters to undefiend */
 369         net->net_tunables.lct_peer_timeout = -1;
 370         net->net_tunables.lct_max_tx_credits = -1;
 371         net->net_tunables.lct_peer_tx_credits = -1;
 372         net->net_tunables.lct_peer_rtr_credits = -1;
 373
 374         if (net_list)
 375                 list_add_tail(&net->net_list, net_list);
 376
 377         return net;
 378 }
 379
 380 static int
 381 lnet_ni_add_interface(struct lnet_ni *ni, char *iface)
 382 {
 383         size_t iface_len = strlen(iface) + 1;
 384
 385         if (ni == NULL)
 386                 return -ENOMEM;
 387
 388         if (ni->ni_interface != NULL) {
 389                 LCONSOLE_ERROR_MSG(0x115, "%s: interface %s already set for net %s: rc = %d\n",
 390                                    iface, ni->ni_interface,
 391                                    libcfs_net2str(LNET_NID_NET(&ni->ni_nid)),
 392                                    -EINVAL);
 393                 return -EINVAL;
 394         }
 395
 396         /* Allocate memory for the interface, so the code parsing input into
 397          * tokens and adding interfaces can free the input safely.
 398          * ni->ni_interface is freed in lnet_ni_free().
 399          */
 400         LIBCFS_ALLOC(ni->ni_interface, iface_len);
 401
 402         if (ni->ni_interface == NULL) {
 403                 CERROR("%s: cannot allocate net interface name: rc = %d\n",
 404                         iface, -ENOMEM);
 405                 return -ENOMEM;
 406         }
 407
 408         strscpy(ni->ni_interface, iface, iface_len);
 409
 410         return 0;
 411 }
 412
 413 static struct lnet_ni *
 414 lnet_ni_alloc_common(struct lnet_net *net, char *iface)
 415 {
 416         struct lnet_tx_queue    *tq;
 417         struct lnet_ni          *ni;
 418         int                     i;
 419
 420         if (iface != NULL)
 421                 /* make sure that this NI is unique in the net it's
 422                  * being added to */
 423                 if (!lnet_ni_unique_net(&net->net_ni_added, iface))
 424                         return NULL;
 425
 426         LIBCFS_ALLOC(ni, sizeof(*ni));
 427         if (ni == NULL) {
 428                 CERROR("Out of memory creating network interface %s%s\n",
 429                        libcfs_net2str(net->net_id),
 430                        (iface != NULL) ? iface : "");
 431                 return NULL;
 432         }
 433
 434         spin_lock_init(&ni->ni_lock);
 435         INIT_LIST_HEAD(&ni->ni_netlist);
 436         INIT_LIST_HEAD(&ni->ni_recovery);
 437         LNetInvalidateMDHandle(&ni->ni_ping_mdh);
 438         ni->ni_refs = cfs_percpt_alloc(lnet_cpt_table(),
 439                                        sizeof(*ni->ni_refs[0]));
 440         if (ni->ni_refs == NULL)
 441                 goto failed;
 442
 443         ni->ni_tx_queues = cfs_percpt_alloc(lnet_cpt_table(),
 444                                             sizeof(*ni->ni_tx_queues[0]));
 445         if (ni->ni_tx_queues == NULL)
 446                 goto failed;
 447
 448         cfs_percpt_for_each(tq, i, ni->ni_tx_queues)
 449                 INIT_LIST_HEAD(&tq->tq_delayed);
 450
 451         ni->ni_net = net;
 452         /* LND will fill in the address part of the NID */
 453         ni->ni_nid.nid_type = LNET_NETTYP(net->net_id);
 454         ni->ni_nid.nid_num = cpu_to_be16(LNET_NETNUM(net->net_id));
 455
 456         /* Store net namespace in which current ni is being created */
 457         if (current->nsproxy && current->nsproxy->net_ns)
 458                 ni->ni_net_ns = get_net(current->nsproxy->net_ns);
 459         else
 460                 ni->ni_net_ns = get_net(&init_net);
 461
 462         ni->ni_state = LNET_NI_STATE_INIT;
 463         ni->ni_sel_priority = LNET_MAX_SELECTION_PRIORITY;
 464         list_add_tail(&ni->ni_netlist, &net->net_ni_added);
 465
 466         /*
 467          * if an interface name is provided then make sure to add in that
 468          * interface name in NI
 469          */
 470         if (iface)
 471                 if (lnet_ni_add_interface(ni, iface) != 0)
 472                         goto failed;
 473
 474         return ni;
 475 failed:
 476         lnet_ni_free(ni);
 477         return NULL;
 478 }
 479
 480 /* allocate and add to the provided network */
 481 struct lnet_ni *
 482 lnet_ni_alloc(struct lnet_net *net, struct cfs_expr_list *el, char *iface)
 483 {
 484         struct lnet_ni          *ni;
 485         int                     rc;
 486
 487         ni = lnet_ni_alloc_common(net, iface);
 488         if (!ni)
 489                 return NULL;
 490
 491         if (!el) {
 492                 ni->ni_cpts  = NULL;
 493                 ni->ni_ncpts = LNET_CPT_NUMBER;
 494         } else {
 495                 rc = cfs_expr_list_values(el, LNET_CPT_NUMBER, &ni->ni_cpts);
 496                 if (rc <= 0) {
 497                         CERROR("Failed to set CPTs for NI %s(%s): %d\n",
 498                                libcfs_net2str(net->net_id),
 499                                (iface != NULL) ? iface : "", rc);
 500                         goto failed;
 501                 }
 502
 503                 LASSERT(rc <= LNET_CPT_NUMBER);
 504                 if (rc == LNET_CPT_NUMBER) {
 505                         CFS_FREE_PTR_ARRAY(ni->ni_cpts, rc);
 506                         ni->ni_cpts = NULL;
 507                 }
 508
 509                 ni->ni_ncpts = rc;
 510         }
 511
 512         rc = lnet_net_append_cpts(ni->ni_cpts, ni->ni_ncpts, net);
 513         if (rc != 0)
 514                 goto failed;
 515
 516         return ni;
 517 failed:
 518         lnet_ni_free(ni);
 519         return NULL;
 520 }
 521
 522 struct lnet_ni *
 523 lnet_ni_alloc_w_cpt_array(struct lnet_net *net, __u32 *cpts, __u32 ncpts,
 524                           char *iface)
 525 {
 526         struct lnet_ni          *ni;
 527         int                     rc;
 528
 529         ni = lnet_ni_alloc_common(net, iface);
 530         if (!ni)
 531                 return NULL;
 532
 533         if (ncpts == 0) {
 534                 ni->ni_cpts  = NULL;
 535                 ni->ni_ncpts = LNET_CPT_NUMBER;
 536         } else {
 537                 size_t array_size = ncpts * sizeof(ni->ni_cpts[0]);
 538
 539                 CFS_ALLOC_PTR_ARRAY(ni->ni_cpts, ncpts);
 540                 if (ni->ni_cpts == NULL)
 541                         goto failed;
 542                 memcpy(ni->ni_cpts, cpts, array_size);
 543                 ni->ni_ncpts = ncpts;
 544         }
 545
 546         rc = lnet_net_append_cpts(ni->ni_cpts, ni->ni_ncpts, net);
 547         if (rc != 0)
 548                 goto failed;
 549
 550         return ni;
 551 failed:
 552         lnet_ni_free(ni);
 553         return NULL;
 554 }
 555
 556 /*
 557  * Parse the networks string and create the matching set of NIs on the
 558  * nilist.
 559  */
 560 int
 561 lnet_parse_networks(struct list_head *netlist, const char *networks)
 562 {
 563         struct cfs_expr_list *net_el = NULL;
 564         struct cfs_expr_list *ni_el = NULL;
 565         int             tokensize;
 566         char            *tokens;
 567         char            *str;
 568         struct lnet_net *net;
 569         struct lnet_ni  *ni = NULL;
 570         __u32           net_id;
 571         int             nnets = 0;
 572
 573         if (networks == NULL) {
 574                 CERROR("networks string is undefined\n");
 575                 return -EINVAL;
 576         }
 577
 578         if (strlen(networks) > LNET_SINGLE_TEXTBUF_NOB) {
 579                 /* _WAY_ conservative */
 580                 LCONSOLE_ERROR_MSG(0x112, "Can't parse networks: string too "
 581                                    "long\n");
 582                 return -EINVAL;
 583         }
 584
 585         tokensize = strlen(networks) + 1;
 586
 587         LIBCFS_ALLOC(tokens, tokensize);
 588         if (tokens == NULL) {
 589                 CERROR("Can't allocate net tokens\n");
 590                 return -ENOMEM;
 591         }
 592
 593         memcpy(tokens, networks, tokensize);
 594         str = tokens;
 595
 596         /*
 597          * Main parser loop.
 598          *
 599          * NB we don't check interface conflicts here; it's the LNDs
 600          * responsibility (if it cares at all)
 601          */
 602         do {
 603                 char *nistr;
 604                 char *elstr;
 605                 char *name;
 606                 int rc;
 607
 608                 /*
 609                  * Parse a network string into its components.
 610                  *
 611                  * <name>{"("...")"}{"["<el>"]"}
 612                  */
 613
 614                 /* Network name (mandatory) */
 615                 while (isspace(*str))
 616                         *str++ = '\0';
 617                 if (!*str)
 618                         break;
 619                 name = str;
 620                 str += strcspn(str, SPACESTR ":()[],");
 621                 while (isspace(*str))
 622                         *str++ = '\0';
 623
 624                 /* Interface list (optional) */
 625                 if (*str == '(') {
 626                         *str++ = '\0';
 627                         nistr = str;
 628                         str += strcspn(str, ")");
 629                         if (*str != ')') {
 630                                 str = nistr;
 631                                 goto failed_syntax;
 632                         }
 633                         do {
 634                                 *str++ = '\0';
 635                         } while (isspace(*str));
 636                 } else {
 637                         nistr = NULL;
 638                 }
 639
 640                 /* CPT expression (optional) */
 641                 if (*str == '[') {
 642                         elstr = str;
 643                         str += strcspn(str, "]");
 644                         if (*str != ']') {
 645                                 str = elstr;
 646                                 goto failed_syntax;
 647                         }
 648                         rc = cfs_expr_list_parse(elstr, str - elstr + 1,
 649                                                 0, LNET_CPT_NUMBER - 1,
 650                                                 &net_el);
 651                         if (rc != 0) {
 652                                 str = elstr;
 653                                 goto failed_syntax;
 654                         }
 655                         *elstr = '\0';
 656                         do {
 657                                 *str++ = '\0';
 658                         } while (isspace(*str));
 659                 }
 660
 661                 /* Bad delimiters */
 662                 if (*str && (strchr(DELIMITERS, *str) != NULL))
 663                         goto failed_syntax;
 664
 665                 /* go to the next net if it exits */
 666                 str += strcspn(str, ",");
 667                 if (*str == ',')
 668                         *str++ = '\0';
 669
 670                 /*
 671                  * At this point the name is properly terminated.
 672                  */
 673                 net_id = libcfs_str2net(name);
 674                 if (net_id == LNET_NET_ANY) {
 675                         LCONSOLE_ERROR_MSG(0x113,
 676                                         "Unrecognised network type\n");
 677                         str = name;
 678                         goto failed_syntax;
 679                 }
 680
 681                 if (LNET_NETTYP(net_id) == LOLND) {
 682                         /* Loopback is implicit, and there can be only one. */
 683                         if (net_el) {
 684                                 cfs_expr_list_free(net_el);
 685                                 net_el = NULL;
 686                         }
 687                         /* Should we error out instead? */
 688                         continue;
 689                 }
 690
 691                 /*
 692                  * All network paramaters are now known.
 693                  */
 694                 nnets++;
 695
 696                 /* always allocate a net, since we will eventually add an
 697                  * interface to it, or we will fail, in which case we'll
 698                  * just delete it */
 699                 net = lnet_net_alloc(net_id, netlist);
 700                 if (IS_ERR_OR_NULL(net))
 701                         goto failed;
 702
 703                 if (!nistr) {
 704                         /*
 705                          * No interface list was specified, allocate a
 706                          * ni using the defaults.
 707                          */
 708                         ni = lnet_ni_alloc(net, net_el, NULL);
 709                         if (IS_ERR_OR_NULL(ni))
 710                                 goto failed;
 711
 712                         if (!nistr) {
 713                                 if (net_el) {
 714                                         cfs_expr_list_free(net_el);
 715                                         net_el = NULL;
 716                                 }
 717                                 continue;
 718                         }
 719                 }
 720
 721                 do {
 722                         elstr = NULL;
 723
 724                         /* Interface name (mandatory) */
 725                         while (isspace(*nistr))
 726                                 *nistr++ = '\0';
 727                         name = nistr;
 728                         nistr += strcspn(nistr, SPACESTR "[],");
 729                         while (isspace(*nistr))
 730                                 *nistr++ = '\0';
 731
 732                         /* CPT expression (optional) */
 733                         if (*nistr == '[') {
 734                                 elstr = nistr;
 735                                 nistr += strcspn(nistr, "]");
 736                                 if (*nistr != ']') {
 737                                         str = elstr;
 738                                         goto failed_syntax;
 739                                 }
 740                                 rc = cfs_expr_list_parse(elstr,
 741                                                         nistr - elstr + 1,
 742                                                         0, LNET_CPT_NUMBER - 1,
 743                                                         &ni_el);
 744                                 if (rc != 0) {
 745                                         str = elstr;
 746                                         goto failed_syntax;
 747                                 }
 748                                 *elstr = '\0';
 749                                 do {
 750                                         *nistr++ = '\0';
 751                                 } while (isspace(*nistr));
 752                         } else {
 753                                 ni_el = net_el;
 754                         }
 755
 756                         /*
 757                          * End of single interface specificaton,
 758                          * advance to the start of the next one, if
 759                          * any.
 760                          */
 761                         if (*nistr == ',') {
 762                                 do {
 763                                         *nistr++ = '\0';
 764                                 } while (isspace(*nistr));
 765                                 if (!*nistr) {
 766                                         str = nistr;
 767                                         goto failed_syntax;
 768                                 }
 769                         } else if (*nistr) {
 770                                 str = nistr;
 771                                 goto failed_syntax;
 772                         }
 773
 774                         /*
 775                          * At this point the name is properly terminated.
 776                          */
 777                         if (!*name) {
 778                                 str = name;
 779                                 goto failed_syntax;
 780                         }
 781
 782                         ni = lnet_ni_alloc(net, ni_el, name);
 783                         if (IS_ERR_OR_NULL(ni))
 784                                 goto failed;
 785
 786                         if (ni_el) {
 787                                 if (ni_el != net_el) {
 788                                         cfs_expr_list_free(ni_el);
 789                                         ni_el = NULL;
 790                                 }
 791                         }
 792                 } while (*nistr);
 793
 794                 if (net_el) {
 795                         cfs_expr_list_free(net_el);
 796                         net_el = NULL;
 797                 }
 798         } while (*str);
 799
 800         LIBCFS_FREE(tokens, tokensize);
 801         return nnets;
 802
 803  failed_syntax:
 804         lnet_syntax("networks", networks, (int)(str - tokens), strlen(str));
 805  failed:
 806         /* free the net list and all the nis on each net */
 807         while ((net = list_first_entry_or_null(netlist,
 808                                                struct lnet_net,
 809                                                net_list)) != NULL) {
 810                 list_del_init(&net->net_list);
 811                 lnet_net_free(net);
 812         }
 813
 814         if (ni_el && ni_el != net_el)
 815                 cfs_expr_list_free(ni_el);
 816         if (net_el)
 817                 cfs_expr_list_free(net_el);
 818
 819         LIBCFS_FREE(tokens, tokensize);
 820
 821         return -EINVAL;
 822 }
 823
 824 static struct lnet_text_buf *lnet_new_text_buf(int str_len)
 825 {
 826         struct lnet_text_buf *ltb;
 827         int nob;
 828
 829         /* NB allocate space for the terminating 0 */
 830         nob = offsetof(struct lnet_text_buf, ltb_text[str_len + 1]);
 831         if (nob > LNET_SINGLE_TEXTBUF_NOB) {
 832                 /* _way_ conservative for "route net gateway..." */
 833                 CERROR("text buffer too big\n");
 834                 return NULL;
 835         }
 836
 837         if (lnet_tbnob + nob > LNET_MAX_TEXTBUF_NOB) {
 838                 CERROR("Too many text buffers\n");
 839                 return NULL;
 840         }
 841
 842         LIBCFS_ALLOC(ltb, nob);
 843         if (ltb == NULL)
 844                 return NULL;
 845
 846         ltb->ltb_size = nob;
 847         ltb->ltb_text[0] = 0;
 848         lnet_tbnob += nob;
 849         return ltb;
 850 }
 851
 852 static void
 853 lnet_free_text_buf(struct lnet_text_buf *ltb)
 854 {
 855         lnet_tbnob -= ltb->ltb_size;
 856         LIBCFS_FREE(ltb, ltb->ltb_size);
 857 }
 858
 859 static void
 860 lnet_free_text_bufs(struct list_head *tbs)
 861 {
 862         struct lnet_text_buf  *ltb;
 863
 864         while ((ltb = list_first_entry_or_null(tbs, struct lnet_text_buf,
 865                                                ltb_list)) != NULL) {
 866                 list_del(&ltb->ltb_list);
 867                 lnet_free_text_buf(ltb);
 868         }
 869 }
 870
 871 static int
 872 lnet_str2tbs_sep(struct list_head *tbs, const char *str)
 873 {
 874         LIST_HEAD(pending);
 875         const char *sep;
 876         int nob;
 877         int i;
 878         struct lnet_text_buf *ltb;
 879
 880         /* Split 'str' into separate commands */
 881         for (;;) {
 882                 /* skip leading whitespace */
 883                 while (isspace(*str))
 884                         str++;
 885
 886                 /* scan for separator or comment */
 887                 for (sep = str; *sep != 0; sep++)
 888                         if (lnet_issep(*sep) || *sep == '#')
 889                                 break;
 890
 891                 nob = (int)(sep - str);
 892                 if (nob > 0) {
 893                         ltb = lnet_new_text_buf(nob);
 894                         if (ltb == NULL) {
 895                                 lnet_free_text_bufs(&pending);
 896                                 return -ENOMEM;
 897                         }
 898
 899                         for (i = 0; i < nob; i++)
 900                                 if (isspace(str[i]))
 901                                         ltb->ltb_text[i] = ' ';
 902                                 else
 903                                         ltb->ltb_text[i] = str[i];
 904
 905                         ltb->ltb_text[nob] = 0;
 906
 907                         list_add_tail(&ltb->ltb_list, &pending);
 908                 }
 909
 910                 if (*sep == '#') {
 911                         /* scan for separator */
 912                         do {
 913                                 sep++;
 914                         } while (*sep != 0 && !lnet_issep(*sep));
 915                 }
 916
 917                 if (*sep == 0)
 918                         break;
 919
 920                 str = sep + 1;
 921         }
 922
 923         list_splice(&pending, tbs->prev);
 924         return 0;
 925 }
 926
 927 static int
 928 lnet_expand1tb(struct list_head *list,
 929                char *str, char *sep1, char *sep2,
 930                char *item, int itemlen)
 931 {
 932         int              len1 = (int)(sep1 - str);
 933         int              len2 = strlen(sep2 + 1);
 934         struct lnet_text_buf *ltb;
 935
 936         LASSERT (*sep1 == '[');
 937         LASSERT (*sep2 == ']');
 938
 939         ltb = lnet_new_text_buf(len1 + itemlen + len2);
 940         if (ltb == NULL)
 941                 return -ENOMEM;
 942
 943         memcpy(ltb->ltb_text, str, len1);
 944         memcpy(&ltb->ltb_text[len1], item, itemlen);
 945         memcpy(&ltb->ltb_text[len1+itemlen], sep2 + 1, len2);
 946         ltb->ltb_text[len1 + itemlen + len2] = 0;
 947
 948         list_add_tail(&ltb->ltb_list, list);
 949         return 0;
 950 }
 951
 952 static int
 953 lnet_str2tbs_expand(struct list_head *tbs, char *str)
 954 {
 955         char              num[16];
 956         LIST_HEAD(pending);
 957         char             *sep;
 958         char             *sep2;
 959         char             *parsed;
 960         char             *enditem;
 961         int               lo;
 962         int               hi;
 963         int               stride;
 964         int               i;
 965         int               nob;
 966         int               scanned;
 967
 968         sep = strchr(str, '[');
 969         if (sep == NULL)                        /* nothing to expand */
 970                 return 0;
 971
 972         sep2 = strchr(sep, ']');
 973         if (sep2 == NULL)
 974                 goto failed;
 975
 976         for (parsed = sep; parsed < sep2; parsed = enditem) {
 977
 978                 enditem = ++parsed;
 979                 while (enditem < sep2 && *enditem != ',')
 980                         enditem++;
 981
 982                 if (enditem == parsed)          /* no empty items */
 983                         goto failed;
 984
 985                 if (sscanf(parsed, "%d-%d/%d%n", &lo, &hi, &stride, &scanned) < 3) {
 986
 987                         if (sscanf(parsed, "%d-%d%n", &lo, &hi, &scanned) < 2) {
 988
 989                                 /* simple string enumeration */
 990                                 if (lnet_expand1tb(&pending, str, sep, sep2,
 991                                                    parsed, (int)(enditem - parsed)) != 0)
 992                                         goto failed;
 993
 994                                 continue;
 995                         }
 996
 997                         stride = 1;
 998                 }
 999
1000                 /* range expansion */
1001
1002                 if (enditem != parsed + scanned) /* no trailing junk */
1003                         goto failed;
1004
1005                 if (hi < 0 || lo < 0 || stride < 0 || hi < lo ||
1006                     (hi - lo) % stride != 0)
1007                         goto failed;
1008
1009                 for (i = lo; i <= hi; i += stride) {
1010
1011                         snprintf(num, sizeof(num), "%d", i);
1012                         nob = strlen(num);
1013                         if (nob + 1 == sizeof(num))
1014                                 goto failed;
1015
1016                         if (lnet_expand1tb(&pending, str, sep, sep2,
1017                                            num, nob) != 0)
1018                                 goto failed;
1019                 }
1020         }
1021
1022         list_splice(&pending, tbs->prev);
1023         return 1;
1024
1025  failed:
1026         lnet_free_text_bufs(&pending);
1027         return -EINVAL;
1028 }
1029
1030 static int
1031 lnet_parse_hops (char *str, unsigned int *hops)
1032 {
1033         int     len = strlen(str);
1034         int     nob = len;
1035
1036         return (sscanf(str, "%u%n", hops, &nob) >= 1 &&
1037                 nob == len &&
1038                 *hops > 0 && *hops < 256);
1039 }
1040
1041 #define LNET_PRIORITY_SEPARATOR (':')
1042
1043 static int
1044 lnet_parse_priority(char *str, unsigned int *priority, char **token)
1045 {
1046         int   nob;
1047         char *sep;
1048         int   len;
1049
1050         sep = strchr(str, LNET_PRIORITY_SEPARATOR);
1051         if (sep == NULL) {
1052                 *priority = 0;
1053                 return 0;
1054         }
1055         len = strlen(sep + 1);
1056
1057         if ((sscanf((sep+1), "%u%n", priority, &nob) < 1) || (len != nob)) {
1058                 /* Update the caller's token pointer so it treats the found
1059                    priority as the token to report in the error message. */
1060                 *token += sep - str + 1;
1061                 return -EINVAL;
1062         }
1063
1064         CDEBUG(D_NET, "gateway %s, priority %d, nob %d\n", str, *priority, nob);
1065
1066         /*
1067          * Change priority separator to \0 to be able to parse NID
1068          */
1069         *sep = '\0';
1070         return 0;
1071 }
1072
1073 static int
1074 lnet_parse_route(char *str, int *im_a_router)
1075 {
1076         /* static scratch buffer OK (single threaded) */
1077         static char cmd[LNET_SINGLE_TEXTBUF_NOB];
1078
1079         LIST_HEAD(nets);
1080         LIST_HEAD(gateways);
1081         struct list_head *tmp1;
1082         struct list_head *tmp2;
1083         __u32 net;
1084         struct lnet_nid nid;
1085         struct lnet_text_buf *ltb = NULL;
1086         struct lnet_text_buf *ltb1, *ltb2;
1087         int rc;
1088         char *sep;
1089         char *token = str;
1090         int ntokens = 0;
1091         int myrc = -1;
1092         __u32 hops;
1093         int got_hops = 0;
1094         unsigned int priority = 0;
1095
1096         /* save a copy of the string for error messages */
1097         strncpy(cmd, str, sizeof(cmd));
1098         cmd[sizeof(cmd) - 1] = '\0';
1099
1100         sep = str;
1101         for (;;) {
1102                 /* scan for token start */
1103                 while (isspace(*sep))
1104                         sep++;
1105                 if (*sep == 0) {
1106                         if (ntokens < (got_hops ? 3 : 2))
1107                                 goto token_error;
1108                         break;
1109                 }
1110
1111                 ntokens++;
1112                 token = sep++;
1113
1114                 /* scan for token end */
1115                 while (*sep != 0 && !isspace(*sep))
1116                         sep++;
1117                 if (*sep != 0)
1118                         *sep++ = 0;
1119
1120                 if (ntokens == 1) {
1121                         tmp2 = &nets;           /* expanding nets */
1122                 } else if (ntokens == 2 &&
1123                            lnet_parse_hops(token, &hops)) {
1124                         got_hops = 1;           /* got a hop count */
1125                         continue;
1126                 } else {
1127                         tmp2 = &gateways;       /* expanding gateways */
1128                 }
1129
1130                 ltb = lnet_new_text_buf(strlen(token));
1131                 if (ltb == NULL)
1132                         goto out;
1133
1134                 strcpy(ltb->ltb_text, token);
1135                 tmp1 = &ltb->ltb_list;
1136                 list_add_tail(tmp1, tmp2);
1137
1138                 while (tmp1 != tmp2) {
1139                         ltb = list_entry(tmp1, struct lnet_text_buf, ltb_list);
1140
1141                         rc = lnet_str2tbs_expand(tmp1->next, ltb->ltb_text);
1142                         if (rc < 0)
1143                                 goto token_error;
1144
1145                         tmp1 = tmp1->next;
1146
1147                         if (rc > 0) {           /* expanded! */
1148                                 list_del(&ltb->ltb_list);
1149                                 lnet_free_text_buf(ltb);
1150                                 continue;
1151                         }
1152
1153                         if (ntokens == 1) {
1154                                 net = libcfs_str2net(ltb->ltb_text);
1155                                 if (net == LNET_NET_ANY ||
1156                                     LNET_NETTYP(net) == LOLND)
1157                                         goto token_error;
1158                         } else {
1159                                 rc = lnet_parse_priority(ltb->ltb_text,
1160                                                          &priority, &token);
1161                                 if (rc < 0)
1162                                         goto token_error;
1163
1164                                 if (libcfs_strnid(&nid, ltb->ltb_text) != 0 ||
1165                                     nid_is_lo0(&nid))
1166                                         goto token_error;
1167                         }
1168                 }
1169         }
1170
1171         /* if there are no hops set then we want to flag this value as
1172          * unset since hops is an optional parameter */
1173         if (!got_hops)
1174                 hops = LNET_UNDEFINED_HOPS;
1175
1176         LASSERT(!list_empty(&nets));
1177         LASSERT(!list_empty(&gateways));
1178
1179         list_for_each_entry(ltb1, &nets, ltb_list) {
1180                 net = libcfs_str2net(ltb1->ltb_text);
1181                 LASSERT(net != LNET_NET_ANY);
1182
1183                 list_for_each_entry(ltb2, &gateways, ltb_list) {
1184                         LASSERT(libcfs_strnid(&nid, ltb->ltb_text) == 0);
1185
1186                         if (lnet_islocalnid(&nid)) {
1187                                 *im_a_router = 1;
1188                                 continue;
1189                         }
1190
1191                         rc = lnet_add_route(net, hops, &nid, priority, 1);
1192                         if (rc != 0 && rc != -EEXIST && rc != -EHOSTUNREACH) {
1193                                 CERROR("Can't create route "
1194                                        "to %s via %s\n",
1195                                        libcfs_net2str(net),
1196                                        libcfs_nidstr(&nid));
1197                                 goto out;
1198                         }
1199                 }
1200         }
1201
1202         myrc = 0;
1203         goto out;
1204
1205 token_error:
1206         lnet_syntax("routes", cmd, (int)(token - str), strlen(token));
1207 out:
1208         lnet_free_text_bufs(&nets);
1209         lnet_free_text_bufs(&gateways);
1210         return myrc;
1211 }
1212
1213 static int
1214 lnet_parse_route_tbs(struct list_head *tbs, int *im_a_router)
1215 {
1216         struct lnet_text_buf *ltb;
1217
1218         while ((ltb = list_first_entry_or_null(tbs, struct lnet_text_buf,
1219                                                ltb_list)) != NULL) {
1220                 if (lnet_parse_route(ltb->ltb_text, im_a_router) < 0) {
1221                         lnet_free_text_bufs(tbs);
1222                         return -EINVAL;
1223                 }
1224
1225                 list_del(&ltb->ltb_list);
1226                 lnet_free_text_buf(ltb);
1227         }
1228
1229         return 0;
1230 }
1231
1232 int
1233 lnet_parse_routes(const char *routes, int *im_a_router)
1234 {
1235         LIST_HEAD(tbs);
1236         int rc = 0;
1237
1238         *im_a_router = 0;
1239
1240         if (lnet_str2tbs_sep(&tbs, routes) < 0) {
1241                 CERROR("Error parsing routes\n");
1242                 rc = -EINVAL;
1243         } else {
1244                 rc = lnet_parse_route_tbs(&tbs, im_a_router);
1245         }
1246
1247         LASSERT (lnet_tbnob == 0);
1248         return rc;
1249 }
1250
1251 static int
1252 lnet_match_network_token(char *token, int len, __u32 *ipaddrs, int nip)
1253 {
1254         LIST_HEAD(list);
1255         int             rc;
1256         int             i;
1257
1258         rc = cfs_ip_addr_parse(token, len, &list);
1259         if (rc != 0)
1260                 return rc;
1261
1262         for (rc = i = 0; !rc && i < nip; i++)
1263                 rc = cfs_ip_addr_match(ipaddrs[i], &list);
1264
1265         cfs_expr_list_free_list(&list);
1266
1267         return rc;
1268 }
1269
1270 static int
1271 lnet_match_network_tokens(char *net_entry, __u32 *ipaddrs, int nip)
1272 {
1273         static char tokens[LNET_SINGLE_TEXTBUF_NOB];
1274
1275         int   matched = 0;
1276         int   ntokens = 0;
1277         int   len;
1278         char *net = NULL;
1279         char *sep;
1280         char *token;
1281         int   rc;
1282
1283         LASSERT(strlen(net_entry) < sizeof(tokens));
1284
1285         /* work on a copy of the string */
1286         strcpy(tokens, net_entry);
1287         sep = tokens;
1288         for (;;) {
1289                 /* scan for token start */
1290                 while (isspace(*sep))
1291                         sep++;
1292                 if (*sep == 0)
1293                         break;
1294
1295                 token = sep++;
1296
1297                 /* scan for token end */
1298                 while (*sep != 0 && !isspace(*sep))
1299                         sep++;
1300                 if (*sep != 0)
1301                         *sep++ = 0;
1302
1303                 if (ntokens++ == 0) {
1304                         net = token;
1305                         continue;
1306                 }
1307
1308                 len = strlen(token);
1309
1310                 rc = lnet_match_network_token(token, len, ipaddrs, nip);
1311                 if (rc < 0) {
1312                         lnet_syntax("ip2nets", net_entry,
1313                                     (int)(token - tokens), len);
1314                         return rc;
1315                 }
1316
1317                 matched |= (rc != 0);
1318         }
1319
1320         if (!matched)
1321                 return 0;
1322
1323         strcpy(net_entry, net);                 /* replace with matched net */
1324         return 1;
1325 }
1326
1327 static __u32
1328 lnet_netspec2net(char *netspec)
1329 {
1330         char   *bracket = strchr(netspec, '(');
1331         __u32   net;
1332
1333         if (bracket != NULL)
1334                 *bracket = 0;
1335
1336         net = libcfs_str2net(netspec);
1337
1338         if (bracket != NULL)
1339                 *bracket = '(';
1340
1341         return net;
1342 }
1343
1344 static int
1345 lnet_splitnets(char *source, struct list_head *nets)
1346 {
1347         int               offset = 0;
1348         int               offset2;
1349         int               len;
1350         struct lnet_text_buf  *tb;
1351         struct lnet_text_buf  *tb2;
1352         char             *sep;
1353         char             *bracket;
1354         __u32             net;
1355
1356         LASSERT(!list_empty(nets));
1357         LASSERT(nets->next == nets->prev);      /* single entry */
1358
1359         tb = list_first_entry(nets, struct lnet_text_buf, ltb_list);
1360
1361         for (;;) {
1362                 sep = strchr(tb->ltb_text, ',');
1363                 bracket = strchr(tb->ltb_text, '(');
1364
1365                 if (sep != NULL &&
1366                     bracket != NULL &&
1367                     bracket < sep) {
1368                         /* netspec lists interfaces... */
1369
1370                         offset2 = offset + (int)(bracket - tb->ltb_text);
1371                         len = strlen(bracket);
1372
1373                         bracket = strchr(bracket + 1, ')');
1374
1375                         if (bracket == NULL ||
1376                             !(bracket[1] == ',' || bracket[1] == 0)) {
1377                                 lnet_syntax("ip2nets", source, offset2, len);
1378                                 return -EINVAL;
1379                         }
1380
1381                         sep = (bracket[1] == 0) ? NULL : bracket + 1;
1382                 }
1383
1384                 if (sep != NULL)
1385                         *sep++ = 0;
1386
1387                 net = lnet_netspec2net(tb->ltb_text);
1388                 if (net == LNET_NET_ANY) {
1389                         lnet_syntax("ip2nets", source, offset,
1390                                     strlen(tb->ltb_text));
1391                         return -EINVAL;
1392                 }
1393
1394                 list_for_each_entry(tb2, nets, ltb_list) {
1395                         if (tb2 == tb)
1396                                 continue;
1397
1398                         if (net == lnet_netspec2net(tb2->ltb_text)) {
1399                                 /* duplicate network */
1400                                 lnet_syntax("ip2nets", source, offset,
1401                                             strlen(tb->ltb_text));
1402                                 return -EINVAL;
1403                         }
1404                 }
1405
1406                 if (sep == NULL)
1407                         return 0;
1408
1409                 offset += (int)(sep - tb->ltb_text);
1410                 len = strlen(sep);
1411                 tb2 = lnet_new_text_buf(len);
1412                 if (tb2 == NULL)
1413                         return -ENOMEM;
1414
1415                 strncpy(tb2->ltb_text, sep, len);
1416                 tb2->ltb_text[len] = '\0';
1417                 list_add_tail(&tb2->ltb_list, nets);
1418
1419                 tb = tb2;
1420         }
1421 }
1422
1423 static int
1424 lnet_match_networks(const char **networksp, const char *ip2nets,
1425                     __u32 *ipaddrs, int nip)
1426 {
1427         static char       networks[LNET_SINGLE_TEXTBUF_NOB];
1428         static char       source[LNET_SINGLE_TEXTBUF_NOB];
1429
1430         LIST_HEAD(raw_entries);
1431         LIST_HEAD(matched_nets);
1432         LIST_HEAD(current_nets);
1433         struct list_head *t;
1434         struct list_head *t2;
1435         struct lnet_text_buf  *tb;
1436         int               len;
1437         int               count;
1438         int               rc;
1439
1440         if (lnet_str2tbs_sep(&raw_entries, ip2nets) < 0) {
1441                 CERROR("Error parsing ip2nets\n");
1442                 LASSERT(lnet_tbnob == 0);
1443                 return -EINVAL;
1444         }
1445
1446         networks[0] = 0;
1447         count = 0;
1448         len = 0;
1449         rc = 0;
1450
1451         while ((tb = list_first_entry_or_null(&raw_entries,
1452                                               struct lnet_text_buf,
1453                                               ltb_list)) != NULL) {
1454                 strncpy(source, tb->ltb_text, sizeof(source));
1455                 source[sizeof(source) - 1] = '\0';
1456
1457                 /* replace ltb_text with the network(s) add on match */
1458                 rc = lnet_match_network_tokens(tb->ltb_text, ipaddrs, nip);
1459                 if (rc < 0)
1460                         break;
1461
1462                 list_del(&tb->ltb_list);
1463
1464                 if (rc == 0) {                  /* no match */
1465                         lnet_free_text_buf(tb);
1466                         continue;
1467                 }
1468
1469                 /* split into separate networks */
1470                 INIT_LIST_HEAD(&current_nets);
1471                 list_add(&tb->ltb_list, &current_nets);
1472                 rc = lnet_splitnets(source, &current_nets);
1473                 if (rc < 0)
1474                         break;
1475
1476                 list_for_each_safe(t, t2, &current_nets) {
1477                         tb = list_entry(t, struct lnet_text_buf, ltb_list);
1478
1479                         list_move_tail(&tb->ltb_list, &matched_nets);
1480
1481                         len += scnprintf(networks + len, sizeof(networks) - len,
1482                                          "%s%s", (len == 0) ? "" : ",",
1483                                          tb->ltb_text);
1484
1485                         if (len >= sizeof(networks)) {
1486                                 CERROR("Too many matched networks\n");
1487                                 rc = -E2BIG;
1488                                 goto out;
1489                         }
1490                 }
1491
1492                 count++;
1493         }
1494
1495  out:
1496         lnet_free_text_bufs(&raw_entries);
1497         lnet_free_text_bufs(&matched_nets);
1498         lnet_free_text_bufs(&current_nets);
1499         LASSERT(lnet_tbnob == 0);
1500
1501         if (rc < 0)
1502                 return rc;
1503
1504         *networksp = networks;
1505         return count;
1506 }
1507
1508 int lnet_inet_enumerate(struct lnet_inetdev **dev_list, struct net *ns)
1509 {
1510         struct lnet_inetdev *ifaces = NULL;
1511         struct net_device *dev;
1512         int nalloc = 0;
1513         int nip = 0;
1514         DECLARE_CONST_IN_IFADDR(ifa);
1515
1516         rtnl_lock();
1517         for_each_netdev(ns, dev) {
1518                 int flags = dev_get_flags(dev);
1519                 struct in_device *in_dev;
1520                 int node_id;
1521                 int cpt;
1522
1523                 if (flags & IFF_LOOPBACK) /* skip the loopback IF */
1524                         continue;
1525
1526                 if (!(flags & IFF_UP)) {
1527                         CWARN("lnet: Ignoring interface %s: it's down\n",
1528                               dev->name);
1529                         continue;
1530                 }
1531
1532                 in_dev = __in_dev_get_rtnl(dev);
1533                 if (!in_dev) {
1534                         CWARN("lnet: Interface %s has no IPv4 status.\n",
1535                               dev->name);
1536                         continue;
1537                 }
1538
1539                 node_id = dev_to_node(&dev->dev);
1540                 cpt = cfs_cpt_of_node(lnet_cpt_table(), node_id);
1541
1542                 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1543                         if (nip >= nalloc) {
1544                                 struct lnet_inetdev *tmp;
1545
1546                                 nalloc += LNET_INTERFACES_NUM;
1547                                 tmp = krealloc(ifaces, nalloc * sizeof(*tmp),
1548                                                GFP_KERNEL);
1549                                 if (!tmp) {
1550                                         kfree(ifaces);
1551                                         ifaces = NULL;
1552                                         nip = -ENOMEM;
1553                                         goto unlock_rtnl;
1554                                 }
1555                                 ifaces = tmp;
1556                         }
1557
1558                         ifaces[nip].li_cpt = cpt;
1559                         ifaces[nip].li_flags = flags;
1560                         ifaces[nip].li_ipaddr = ntohl(ifa->ifa_local);
1561                         ifaces[nip].li_netmask = ntohl(ifa->ifa_mask);
1562                         strlcpy(ifaces[nip].li_name, ifa->ifa_label,
1563                                 sizeof(ifaces[nip].li_name));
1564                         nip++;
1565                 }
1566                 endfor_ifa(in_dev);
1567         }
1568 unlock_rtnl:
1569         rtnl_unlock();
1570
1571         if (nip == 0) {
1572                 CERROR("lnet: Can't find any usable interfaces, rc = -ENOENT\n");
1573                 nip = -ENOENT;
1574         }
1575
1576         *dev_list = ifaces;
1577         return nip;
1578 }
1579 EXPORT_SYMBOL(lnet_inet_enumerate);
1580
1581 int
1582 lnet_parse_ip2nets(const char **networksp, const char *ip2nets)
1583 {
1584         struct lnet_inetdev *ifaces = NULL;
1585         __u32     *ipaddrs = NULL;
1586         int nip;
1587         int        rc;
1588         int i;
1589
1590         if (current->nsproxy && current->nsproxy->net_ns)
1591                 nip = lnet_inet_enumerate(&ifaces, current->nsproxy->net_ns);
1592         else
1593                 nip = lnet_inet_enumerate(&ifaces, &init_net);
1594         if (nip < 0) {
1595                 if (nip != -ENOENT) {
1596                         LCONSOLE_ERROR_MSG(0x117,
1597                                            "Error %d enumerating local IP interfaces for ip2nets to match\n",
1598                                            nip);
1599                 } else {
1600                         LCONSOLE_ERROR_MSG(0x118,
1601                                            "No local IP interfaces for ip2nets to match\n");
1602                 }
1603                 return nip;
1604         }
1605
1606         CFS_ALLOC_PTR_ARRAY(ipaddrs, nip);
1607         if (!ipaddrs) {
1608                 rc = -ENOMEM;
1609                 CERROR("lnet: Can't allocate ipaddrs[%d], rc = %d\n",
1610                        nip, rc);
1611                 goto out_free_addrs;
1612         }
1613
1614         for (i = 0; i < nip; i++)
1615                 ipaddrs[i] = ifaces[i].li_ipaddr;
1616
1617         rc = lnet_match_networks(networksp, ip2nets, ipaddrs, nip);
1618         if (rc < 0) {
1619                 LCONSOLE_ERROR_MSG(0x119, "Error %d parsing ip2nets\n", rc);
1620         } else if (rc == 0) {
1621                 LCONSOLE_ERROR_MSG(0x11a, "ip2nets does not match "
1622                                    "any local IP interfaces\n");
1623                 rc = -ENOENT;
1624         }
1625         CFS_FREE_PTR_ARRAY(ipaddrs, nip);
1626 out_free_addrs:
1627         kfree(ifaces);
1628         return rc > 0 ? 0 : rc;
1629 }