libcfs/libcfs/util/nidstrings.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) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2015, 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  * libcfs/libcfs/util/nidstrings.c
  33  *
  34  * Author: Phil Schwan <phil@clusterfs.com>
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LNET
  38
  39 #include <assert.h>
  40 #include <errno.h>
  41 #include <stdio.h>
  42 #include <stdbool.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45
  46 #include <libcfs/util/string.h>
  47 #include <lnet/types.h>
  48 #include <lnet/nidstr.h>
  49 #ifdef HAVE_NETDB_H
  50 # include <netdb.h>
  51 #endif
  52
  53 /* max value for numeric network address */
  54 #define MAX_NUMERIC_VALUE 0xffffffff
  55
  56 #define IPSTRING_LENGTH 16
  57
  58 /* CAVEAT VENDITOR! Keep the canonical string representation of nets/nids
  59  * consistent in all conversion functions.  Some code fragments are copied
  60  * around for the sake of clarity...
  61  */
  62
  63 /* CAVEAT EMPTOR! Racey temporary buffer allocation!
  64  * Choose the number of nidstrings to support the MAXIMUM expected number of
  65  * concurrent users.  If there are more, the returned string will be volatile.
  66  * NB this number must allow for a process to be descheduled for a timeslice
  67  * between getting its string and using it.
  68  */
  69
  70 static char      libcfs_nidstrings[LNET_NIDSTR_COUNT][LNET_NIDSTR_SIZE];
  71 static int       libcfs_nidstring_idx;
  72
  73 char *
  74 libcfs_next_nidstring(void)
  75 {
  76         char          *str;
  77
  78         str = libcfs_nidstrings[libcfs_nidstring_idx++];
  79         if (libcfs_nidstring_idx ==
  80             sizeof(libcfs_nidstrings)/sizeof(libcfs_nidstrings[0]))
  81                 libcfs_nidstring_idx = 0;
  82
  83         return str;
  84 }
  85
  86 static int
  87 libcfs_lo_str2addr(const char *str, int nob, __u32 *addr)
  88 {
  89         *addr = 0;
  90         return 1;
  91 }
  92
  93 static void
  94 libcfs_ip_addr2str(__u32 addr, char *str, size_t size)
  95 {
  96         snprintf(str, size, "%u.%u.%u.%u",
  97                  (addr >> 24) & 0xff, (addr >> 16) & 0xff,
  98                  (addr >> 8) & 0xff, addr & 0xff);
  99 }
 100
 101 /* CAVEAT EMPTOR XscanfX
 102  * I use "%n" at the end of a sscanf format to detect trailing junk.  However
 103  * sscanf may return immediately if it sees the terminating '0' in a string, so
 104  * I initialise the %n variable to the expected length.  If sscanf sets it;
 105  * fine, if it doesn't, then the scan ended at the end of the string, which is
 106  * fine too :) */
 107 static int
 108 libcfs_ip_str2addr(const char *str, int nob, __u32 *addr)
 109 {
 110         unsigned int    a;
 111         unsigned int    b;
 112         unsigned int    c;
 113         unsigned int    d;
 114         int             n = nob; /* XscanfX */
 115
 116         /* numeric IP? */
 117         if (sscanf(str, "%u.%u.%u.%u%n", &a, &b, &c, &d, &n) >= 4 &&
 118             n == nob &&
 119             (a & ~0xff) == 0 && (b & ~0xff) == 0 &&
 120             (c & ~0xff) == 0 && (d & ~0xff) == 0) {
 121                 *addr = ((a<<24)|(b<<16)|(c<<8)|d);
 122                 return 1;
 123         }
 124
 125 #ifdef HAVE_GETHOSTBYNAME
 126         /* known hostname? */
 127         if (('a' <= str[0] && str[0] <= 'z') ||
 128             ('A' <= str[0] && str[0] <= 'Z')) {
 129                 char *tmp;
 130
 131                 tmp = calloc(1, nob + 1);
 132                 if (tmp != NULL) {
 133                         struct hostent *he;
 134
 135                         memcpy(tmp, str, nob);
 136                         tmp[nob] = 0;
 137
 138                         he = gethostbyname(tmp);
 139
 140                         free(tmp);
 141
 142                         if (he != NULL) {
 143                                 __u32 ip = *(__u32 *)he->h_addr;
 144
 145                                 *addr = ntohl(ip);
 146                                 return 1;
 147                         }
 148                 }
 149         }
 150 #endif
 151         return 0;
 152 }
 153
 154 int
 155 cfs_ip_addr_parse(char *str, int len, struct list_head *list)
 156 {
 157         struct cfs_expr_list *el;
 158         struct cfs_lstr src;
 159         int rc;
 160         int i;
 161
 162         src.ls_str = str;
 163         src.ls_len = len;
 164         i = 0;
 165
 166         while (src.ls_str != NULL) {
 167                 struct cfs_lstr res;
 168
 169                 if (!cfs_gettok(&src, '.', &res)) {
 170                         rc = -EINVAL;
 171                         goto out;
 172                 }
 173
 174                 rc = cfs_expr_list_parse(res.ls_str, res.ls_len, 0, 255, &el);
 175                 if (rc != 0)
 176                         goto out;
 177
 178                 list_add_tail(&el->el_link, list);
 179                 i++;
 180         }
 181
 182         if (i == 4)
 183                 return 0;
 184
 185         rc = -EINVAL;
 186 out:
 187         cfs_expr_list_free_list(list);
 188
 189         return rc;
 190 }
 191
 192 static int
 193 libcfs_ip_addr_range_print(char *buffer, int count, struct list_head *list)
 194 {
 195         int i = 0, j = 0;
 196         struct cfs_expr_list *el;
 197
 198         list_for_each_entry(el, list, el_link) {
 199                 assert(j++ < 4);
 200                 if (i != 0)
 201                         i += snprintf(buffer + i, count - i, ".");
 202                 i += cfs_expr_list_print(buffer + i, count - i, el);
 203         }
 204         return i;
 205 }
 206
 207 /**
 208  * Matches address (\a addr) against address set encoded in \a list.
 209  *
 210  * \retval 1 if \a addr matches
 211  * \retval 0 otherwise
 212  */
 213 int
 214 cfs_ip_addr_match(__u32 addr, struct list_head *list)
 215 {
 216         struct cfs_expr_list *el;
 217         int i = 0;
 218
 219         list_for_each_entry_reverse(el, list, el_link) {
 220                 if (!cfs_expr_list_match(addr & 0xff, el))
 221                         return 0;
 222                 addr >>= 8;
 223                 i++;
 224         }
 225
 226         return i == 4;
 227 }
 228
 229 static void
 230 libcfs_decnum_addr2str(__u32 addr, char *str, size_t size)
 231 {
 232         snprintf(str, size, "%u", addr);
 233 }
 234
 235 static void
 236 libcfs_hexnum_addr2str(__u32 addr, char *str, size_t size)
 237 {
 238         snprintf(str, size, "0x%x", addr);
 239 }
 240
 241 static int
 242 libcfs_num_str2addr(const char *str, int nob, __u32 *addr)
 243 {
 244         int     n;
 245
 246         n = nob;
 247         if (sscanf(str, "0x%x%n", addr, &n) >= 1 && n == nob)
 248                 return 1;
 249
 250         n = nob;
 251         if (sscanf(str, "0X%x%n", addr, &n) >= 1 && n == nob)
 252                 return 1;
 253
 254         n = nob;
 255         if (sscanf(str, "%u%n", addr, &n) >= 1 && n == nob)
 256                 return 1;
 257
 258         return 0;
 259 }
 260
 261 /**
 262  * Nf_parse_addrlist method for networks using numeric addresses.
 263  *
 264  * Examples of such networks are gm and elan.
 265  *
 266  * \retval 0 if \a str parsed to numeric address
 267  * \retval errno otherwise
 268  */
 269 static int
 270 libcfs_num_parse(char *str, int len, struct list_head *list)
 271 {
 272         struct cfs_expr_list *el;
 273         int     rc;
 274
 275         rc = cfs_expr_list_parse(str, len, 0, MAX_NUMERIC_VALUE, &el);
 276         if (rc == 0)
 277                 list_add_tail(&el->el_link, list);
 278
 279         return rc;
 280 }
 281
 282 static int
 283 libcfs_num_addr_range_print(char *buffer, int count, struct list_head *list)
 284 {
 285         struct cfs_expr_list *el;
 286         int i = 0, j = 0;
 287
 288         list_for_each_entry(el, list, el_link) {
 289                 assert(j++ < 1);
 290                 i += cfs_expr_list_print(buffer + i, count - i, el);
 291         }
 292         return i;
 293 }
 294
 295 /*
 296  * Nf_match_addr method for networks using numeric addresses
 297  *
 298  * \retval 1 on match
 299  * \retval 0 otherwise
 300  */
 301 static int
 302 libcfs_num_match(__u32 addr, struct list_head *numaddr)
 303 {
 304         struct cfs_expr_list *el;
 305
 306         assert(!list_empty(numaddr));
 307         el = list_entry(numaddr->next, struct cfs_expr_list, el_link);
 308
 309         return cfs_expr_list_match(addr, el);
 310 }
 311
 312 static bool cfs_ip_is_contiguous(struct list_head *nidlist);
 313 static void cfs_ip_min_max(struct list_head *nidlist, __u32 *min, __u32 *max);
 314 static bool cfs_num_is_contiguous(struct list_head *nidlist);
 315 static void cfs_num_min_max(struct list_head *nidlist, __u32 *min, __u32 *max);
 316
 317 static struct netstrfns libcfs_netstrfns[] = {
 318         {
 319                 .nf_type                = LOLND,
 320                 .nf_name                = "lo",
 321                 .nf_modname             = "klolnd",
 322                 .nf_addr2str            = libcfs_decnum_addr2str,
 323                 .nf_str2addr            = libcfs_lo_str2addr,
 324                 .nf_parse_addrlist      = libcfs_num_parse,
 325                 .nf_print_addrlist      = libcfs_num_addr_range_print,
 326                 .nf_match_addr          = libcfs_num_match,
 327                 .nf_is_contiguous       = cfs_num_is_contiguous,
 328                 .nf_min_max             = cfs_num_min_max
 329         },
 330         {
 331                 .nf_type                = SOCKLND,
 332                 .nf_name                = "tcp",
 333                 .nf_modname             = "ksocklnd",
 334                 .nf_addr2str            = libcfs_ip_addr2str,
 335                 .nf_str2addr            = libcfs_ip_str2addr,
 336                 .nf_parse_addrlist      = cfs_ip_addr_parse,
 337                 .nf_print_addrlist      = libcfs_ip_addr_range_print,
 338                 .nf_match_addr          = cfs_ip_addr_match,
 339                 .nf_is_contiguous       = cfs_ip_is_contiguous,
 340                 .nf_min_max             = cfs_ip_min_max
 341         },
 342         {
 343                 .nf_type                = O2IBLND,
 344                 .nf_name                = "o2ib",
 345                 .nf_modname             = "ko2iblnd",
 346                 .nf_addr2str            = libcfs_ip_addr2str,
 347                 .nf_str2addr            = libcfs_ip_str2addr,
 348                 .nf_parse_addrlist      = cfs_ip_addr_parse,
 349                 .nf_print_addrlist      = libcfs_ip_addr_range_print,
 350                 .nf_match_addr          = cfs_ip_addr_match,
 351                 .nf_is_contiguous       = cfs_ip_is_contiguous,
 352                 .nf_min_max             = cfs_ip_min_max
 353         },
 354         {
 355                 .nf_type                = CIBLND,
 356                 .nf_name                = "cib",
 357                 .nf_modname             = "kciblnd",
 358                 .nf_addr2str            = libcfs_ip_addr2str,
 359                 .nf_str2addr            = libcfs_ip_str2addr,
 360                 .nf_parse_addrlist      = cfs_ip_addr_parse,
 361                 .nf_print_addrlist      = libcfs_ip_addr_range_print,
 362                 .nf_match_addr          = cfs_ip_addr_match,
 363                 .nf_is_contiguous       = cfs_ip_is_contiguous,
 364                 .nf_min_max             = cfs_ip_min_max
 365         },
 366         {
 367                 .nf_type                = OPENIBLND,
 368                 .nf_name                = "openib",
 369                 .nf_modname             = "kopeniblnd",
 370                 .nf_addr2str            = libcfs_ip_addr2str,
 371                 .nf_str2addr            = libcfs_ip_str2addr,
 372                 .nf_parse_addrlist      = cfs_ip_addr_parse,
 373                 .nf_print_addrlist      = libcfs_ip_addr_range_print,
 374                 .nf_match_addr          = cfs_ip_addr_match,
 375                 .nf_is_contiguous       = cfs_ip_is_contiguous,
 376                 .nf_min_max             = cfs_ip_min_max
 377         },
 378         {
 379                 .nf_type                = IIBLND,
 380                 .nf_name                = "iib",
 381                 .nf_modname             = "kiiblnd",
 382                 .nf_addr2str            = libcfs_ip_addr2str,
 383                 .nf_str2addr            = libcfs_ip_str2addr,
 384                 .nf_parse_addrlist      = cfs_ip_addr_parse,
 385                 .nf_print_addrlist      = libcfs_ip_addr_range_print,
 386                 .nf_match_addr          = cfs_ip_addr_match,
 387                 .nf_is_contiguous       = cfs_ip_is_contiguous,
 388                 .nf_min_max             = cfs_ip_min_max
 389         },
 390         {
 391                 .nf_type                = VIBLND,
 392                 .nf_name                = "vib",
 393                 .nf_modname             = "kviblnd",
 394                 .nf_addr2str            = libcfs_ip_addr2str,
 395                 .nf_str2addr            = libcfs_ip_str2addr,
 396                 .nf_parse_addrlist      = cfs_ip_addr_parse,
 397                 .nf_print_addrlist      = libcfs_ip_addr_range_print,
 398                 .nf_match_addr          = cfs_ip_addr_match,
 399                 .nf_is_contiguous       = cfs_ip_is_contiguous,
 400                 .nf_min_max             = cfs_ip_min_max
 401         },
 402         {
 403                 .nf_type                = RALND,
 404                 .nf_name                = "ra",
 405                 .nf_modname             = "kralnd",
 406                 .nf_addr2str            = libcfs_ip_addr2str,
 407                 .nf_str2addr            = libcfs_ip_str2addr,
 408                 .nf_parse_addrlist      = cfs_ip_addr_parse,
 409                 .nf_print_addrlist      = libcfs_ip_addr_range_print,
 410                 .nf_match_addr          = cfs_ip_addr_match,
 411                 .nf_is_contiguous       = cfs_ip_is_contiguous,
 412                 .nf_min_max             = cfs_ip_min_max
 413         },
 414         {
 415                 .nf_type                = QSWLND,
 416                 .nf_name                = "elan",
 417                 .nf_modname             = "kqswlnd",
 418                 .nf_addr2str            = libcfs_decnum_addr2str,
 419                 .nf_str2addr            = libcfs_num_str2addr,
 420                 .nf_parse_addrlist      = libcfs_num_parse,
 421                 .nf_print_addrlist      = libcfs_num_addr_range_print,
 422                 .nf_match_addr          = libcfs_num_match,
 423                 .nf_is_contiguous       = cfs_num_is_contiguous,
 424                 .nf_min_max             = cfs_num_min_max
 425         },
 426         {
 427                 .nf_type                = GMLND,
 428                 .nf_name                = "gm",
 429                 .nf_modname             = "kgmlnd",
 430                 .nf_addr2str            = libcfs_hexnum_addr2str,
 431                 .nf_str2addr            = libcfs_num_str2addr,
 432                 .nf_parse_addrlist      = libcfs_num_parse,
 433                 .nf_print_addrlist      = libcfs_num_addr_range_print,
 434                 .nf_match_addr          = libcfs_num_match,
 435                 .nf_is_contiguous       = cfs_num_is_contiguous,
 436                 .nf_min_max             = cfs_num_min_max
 437         },
 438         {
 439                 .nf_type                = MXLND,
 440                 .nf_name                = "mx",
 441                 .nf_modname             = "kmxlnd",
 442                 .nf_addr2str            = libcfs_ip_addr2str,
 443                 .nf_str2addr            = libcfs_ip_str2addr,
 444                 .nf_parse_addrlist      = cfs_ip_addr_parse,
 445                 .nf_print_addrlist      = libcfs_ip_addr_range_print,
 446                 .nf_match_addr          = cfs_ip_addr_match,
 447                 .nf_is_contiguous       = cfs_ip_is_contiguous,
 448                 .nf_min_max             = cfs_ip_min_max
 449         },
 450         {
 451                 .nf_type                = PTLLND,
 452                 .nf_name                = "ptl",
 453                 .nf_modname             = "kptllnd",
 454                 .nf_addr2str            = libcfs_decnum_addr2str,
 455                 .nf_str2addr            = libcfs_num_str2addr,
 456                 .nf_parse_addrlist      = libcfs_num_parse,
 457                 .nf_print_addrlist      = libcfs_num_addr_range_print,
 458                 .nf_match_addr          = libcfs_num_match,
 459                 .nf_is_contiguous       = cfs_num_is_contiguous,
 460                 .nf_min_max             = cfs_num_min_max
 461         },
 462         {
 463                 .nf_type                = GNILND,
 464                 .nf_name                = "gni",
 465                 .nf_modname             = "kgnilnd",
 466                 .nf_addr2str            = libcfs_decnum_addr2str,
 467                 .nf_str2addr            = libcfs_num_str2addr,
 468                 .nf_parse_addrlist      = libcfs_num_parse,
 469                 .nf_print_addrlist      = libcfs_num_addr_range_print,
 470                 .nf_match_addr          = libcfs_num_match,
 471                 .nf_is_contiguous       = cfs_num_is_contiguous,
 472                 .nf_min_max             = cfs_num_min_max
 473         },
 474         {
 475                 .nf_type                = GNIIPLND,
 476                 .nf_name                = "gip",
 477                 .nf_modname             = "kgnilnd",
 478                 .nf_addr2str            = libcfs_ip_addr2str,
 479                 .nf_str2addr            = libcfs_ip_str2addr,
 480                 .nf_parse_addrlist      = cfs_ip_addr_parse,
 481                 .nf_print_addrlist      = libcfs_ip_addr_range_print,
 482                 .nf_match_addr          = cfs_ip_addr_match,
 483                 .nf_is_contiguous       = cfs_ip_is_contiguous,
 484                 .nf_min_max             = cfs_ip_min_max
 485         }
 486 };
 487
 488 static const size_t libcfs_nnetstrfns =
 489         sizeof(libcfs_netstrfns)/sizeof(libcfs_netstrfns[0]);
 490
 491 static struct netstrfns *
 492 libcfs_lnd2netstrfns(__u32 lnd)
 493 {
 494         int     i;
 495
 496         for (i = 0; i < libcfs_nnetstrfns; i++)
 497                 if (lnd == libcfs_netstrfns[i].nf_type)
 498                         return &libcfs_netstrfns[i];
 499
 500         return NULL;
 501 }
 502
 503 static struct netstrfns *
 504 libcfs_namenum2netstrfns(const char *name)
 505 {
 506         struct netstrfns *nf;
 507         int               i;
 508
 509         for (i = 0; i < libcfs_nnetstrfns; i++) {
 510                 nf = &libcfs_netstrfns[i];
 511                 if (!strncmp(name, nf->nf_name, strlen(nf->nf_name)))
 512                         return nf;
 513         }
 514         return NULL;
 515 }
 516
 517 static struct netstrfns *
 518 libcfs_name2netstrfns(const char *name)
 519 {
 520         int    i;
 521
 522         for (i = 0; i < libcfs_nnetstrfns; i++)
 523                 if (!strcmp(libcfs_netstrfns[i].nf_name, name))
 524                         return &libcfs_netstrfns[i];
 525
 526         return NULL;
 527 }
 528
 529 int
 530 libcfs_isknown_lnd(__u32 lnd)
 531 {
 532         return libcfs_lnd2netstrfns(lnd) != NULL;
 533 }
 534
 535 char *
 536 libcfs_lnd2modname(__u32 lnd)
 537 {
 538         struct netstrfns *nf = libcfs_lnd2netstrfns(lnd);
 539
 540         return (nf == NULL) ? NULL : nf->nf_modname;
 541 }
 542
 543 int
 544 libcfs_str2lnd(const char *str)
 545 {
 546         struct netstrfns *nf = libcfs_name2netstrfns(str);
 547
 548         if (nf != NULL)
 549                 return nf->nf_type;
 550
 551         return -1;
 552 }
 553
 554 char *
 555 libcfs_lnd2str_r(__u32 lnd, char *buf, size_t buf_size)
 556 {
 557         struct netstrfns *nf;
 558
 559         nf = libcfs_lnd2netstrfns(lnd);
 560         if (nf == NULL)
 561                 snprintf(buf, buf_size, "?%u?", lnd);
 562         else
 563                 snprintf(buf, buf_size, "%s", nf->nf_name);
 564
 565         return buf;
 566 }
 567
 568 char *
 569 libcfs_net2str_r(__u32 net, char *buf, size_t buf_size)
 570 {
 571         __u32             nnum = LNET_NETNUM(net);
 572         __u32             lnd  = LNET_NETTYP(net);
 573         struct netstrfns *nf;
 574
 575         nf = libcfs_lnd2netstrfns(lnd);
 576         if (nf == NULL)
 577                 snprintf(buf, buf_size, "<%u:%u>", lnd, nnum);
 578         else if (nnum == 0)
 579                 snprintf(buf, buf_size, "%s", nf->nf_name);
 580         else
 581                 snprintf(buf, buf_size, "%s%u", nf->nf_name, nnum);
 582
 583         return buf;
 584 }
 585
 586 char *
 587 libcfs_nid2str_r(lnet_nid_t nid, char *buf, size_t buf_size)
 588 {
 589         __u32             addr = LNET_NIDADDR(nid);
 590         __u32             net  = LNET_NIDNET(nid);
 591         __u32             nnum = LNET_NETNUM(net);
 592         __u32             lnd  = LNET_NETTYP(net);
 593         struct netstrfns *nf;
 594
 595         if (nid == LNET_NID_ANY) {
 596                 strncpy(buf, "<?>", buf_size);
 597                 buf[buf_size - 1] = '\0';
 598                 return buf;
 599         }
 600
 601         nf = libcfs_lnd2netstrfns(lnd);
 602         if (nf == NULL) {
 603                 snprintf(buf, buf_size, "%x@<%u:%u>", addr, lnd, nnum);
 604         } else {
 605                 size_t addr_len;
 606
 607                 nf->nf_addr2str(addr, buf, buf_size);
 608                 addr_len = strlen(buf);
 609                 if (nnum == 0)
 610                         snprintf(buf + addr_len, buf_size - addr_len, "@%s",
 611                                  nf->nf_name);
 612                 else
 613                         snprintf(buf + addr_len, buf_size - addr_len, "@%s%u",
 614                                  nf->nf_name, nnum);
 615         }
 616
 617         return buf;
 618 }
 619
 620 static struct netstrfns *
 621 libcfs_str2net_internal(const char *str, __u32 *net)
 622 {
 623         struct netstrfns *nf = NULL;
 624         int               nob;
 625         unsigned int      netnum;
 626         int               i;
 627
 628         for (i = 0; i < libcfs_nnetstrfns; i++) {
 629                 nf = &libcfs_netstrfns[i];
 630                 if (!strncmp(str, nf->nf_name, strlen(nf->nf_name)))
 631                         break;
 632         }
 633
 634         if (i == libcfs_nnetstrfns)
 635                 return NULL;
 636
 637         nob = strlen(nf->nf_name);
 638
 639         if (strlen(str) == (unsigned int)nob) {
 640                 netnum = 0;
 641         } else {
 642                 if (nf->nf_type == LOLND) /* net number not allowed */
 643                         return NULL;
 644
 645                 str += nob;
 646                 i = strlen(str);
 647                 if (sscanf(str, "%u%n", &netnum, &i) < 1 ||
 648                     i != (int)strlen(str))
 649                         return NULL;
 650         }
 651
 652         *net = LNET_MKNET(nf->nf_type, netnum);
 653         return nf;
 654 }
 655
 656 __u32
 657 libcfs_str2net(const char *str)
 658 {
 659         __u32  net;
 660
 661         if (libcfs_str2net_internal(str, &net) != NULL)
 662                 return net;
 663
 664         return LNET_NIDNET(LNET_NID_ANY);
 665 }
 666
 667 lnet_nid_t
 668 libcfs_str2nid(const char *str)
 669 {
 670         const char       *sep = strchr(str, '@');
 671         struct netstrfns *nf;
 672         __u32             net;
 673         __u32             addr;
 674
 675         if (sep != NULL) {
 676                 nf = libcfs_str2net_internal(sep + 1, &net);
 677                 if (nf == NULL)
 678                         return LNET_NID_ANY;
 679         } else {
 680                 sep = str + strlen(str);
 681                 net = LNET_MKNET(SOCKLND, 0);
 682                 nf = libcfs_lnd2netstrfns(SOCKLND);
 683                 assert(nf != NULL);
 684         }
 685
 686         if (!nf->nf_str2addr(str, (int)(sep - str), &addr))
 687                 return LNET_NID_ANY;
 688
 689         return LNET_MKNID(net, addr);
 690 }
 691
 692 char *
 693 libcfs_id2str(lnet_process_id_t id)
 694 {
 695         char *str = libcfs_next_nidstring();
 696
 697         if (id.pid == LNET_PID_ANY) {
 698                 snprintf(str, LNET_NIDSTR_SIZE,
 699                          "LNET_PID_ANY-%s", libcfs_nid2str(id.nid));
 700                 return str;
 701         }
 702
 703         snprintf(str, LNET_NIDSTR_SIZE, "%s%u-%s",
 704                  ((id.pid & LNET_PID_USERFLAG) != 0) ? "U" : "",
 705                  (id.pid & ~LNET_PID_USERFLAG), libcfs_nid2str(id.nid));
 706         return str;
 707 }
 708
 709 int
 710 libcfs_str2anynid(lnet_nid_t *nidp, const char *str)
 711 {
 712         if (!strcmp(str, "*")) {
 713                 *nidp = LNET_NID_ANY;
 714                 return 1;
 715         }
 716
 717         *nidp = libcfs_str2nid(str);
 718         return *nidp != LNET_NID_ANY;
 719 }
 720
 721 /**
 722  * Nid range list syntax.
 723  * \verbatim
 724  *
 725  * <nidlist>         :== <nidrange> [ ' ' <nidrange> ]
 726  * <nidrange>        :== <addrrange> '@' <net>
 727  * <addrrange>       :== '*' |
 728  *                       <ipaddr_range> |
 729  *                       <cfs_expr_list>
 730  * <ipaddr_range>    :== <cfs_expr_list>.<cfs_expr_list>.<cfs_expr_list>.
 731  *                       <cfs_expr_list>
 732  * <cfs_expr_list>   :== <number> |
 733  *                       <expr_list>
 734  * <expr_list>       :== '[' <range_expr> [ ',' <range_expr>] ']'
 735  * <range_expr>      :== <number> |
 736  *                       <number> '-' <number> |
 737  *                       <number> '-' <number> '/' <number>
 738  * <net>             :== <netname> | <netname><number>
 739  * <netname>         :== "lo" | "tcp" | "o2ib" | "cib" | "openib" | "iib" |
 740  *                       "vib" | "ra" | "elan" | "mx" | "ptl"
 741  * \endverbatim
 742  */
 743
 744 /**
 745  * Structure to represent \<nidrange\> token of the syntax.
 746  *
 747  * One of this is created for each \<net\> parsed.
 748  */
 749 struct nidrange {
 750         /**
 751          * Link to list of this structures which is built on nid range
 752          * list parsing.
 753          */
 754         struct list_head nr_link;
 755         /**
 756          * List head for addrrange::ar_link.
 757          */
 758         struct list_head nr_addrranges;
 759         /**
 760          * Flag indicating that *@<net> is found.
 761          */
 762         int nr_all;
 763         /**
 764          * Pointer to corresponding element of libcfs_netstrfns.
 765          */
 766         struct netstrfns *nr_netstrfns;
 767         /**
 768          * Number of network. E.g. 5 if \<net\> is "elan5".
 769          */
 770         int nr_netnum;
 771 };
 772
 773 /**
 774  * Structure to represent \<addrrange\> token of the syntax.
 775  */
 776 struct addrrange {
 777         /**
 778          * Link to nidrange::nr_addrranges.
 779          */
 780         struct list_head ar_link;
 781         /**
 782          * List head for cfs_expr_list::el_list.
 783          */
 784         struct list_head ar_numaddr_ranges;
 785 };
 786
 787 /**
 788  * Parses \<addrrange\> token on the syntax.
 789  *
 790  * Allocates struct addrrange and links to \a nidrange via
 791  * (nidrange::nr_addrranges)
 792  *
 793  * \retval 0 if \a src parses to '*' | \<ipaddr_range\> | \<cfs_expr_list\>
 794  * \retval -errno otherwise
 795  */
 796 static int
 797 parse_addrange(const struct cfs_lstr *src, struct nidrange *nidrange)
 798 {
 799         struct addrrange *addrrange;
 800
 801         if (src->ls_len == 1 && src->ls_str[0] == '*') {
 802                 nidrange->nr_all = 1;
 803                 return 0;
 804         }
 805
 806         addrrange = calloc(1, sizeof(struct addrrange));
 807         if (addrrange == NULL)
 808                 return -ENOMEM;
 809         list_add_tail(&addrrange->ar_link, &nidrange->nr_addrranges);
 810         INIT_LIST_HEAD(&addrrange->ar_numaddr_ranges);
 811
 812         return nidrange->nr_netstrfns->nf_parse_addrlist(src->ls_str,
 813                                                 src->ls_len,
 814                                                 &addrrange->ar_numaddr_ranges);
 815 }
 816
 817 /**
 818  * Finds or creates struct nidrange.
 819  *
 820  * Checks if \a src is a valid network name, looks for corresponding
 821  * nidrange on the ist of nidranges (\a nidlist), creates new struct
 822  * nidrange if it is not found.
 823  *
 824  * \retval pointer to struct nidrange matching network specified via \a src
 825  * \retval NULL if \a src does not match any network
 826  */
 827 static struct nidrange *
 828 add_nidrange(const struct cfs_lstr *src,
 829              struct list_head *nidlist)
 830 {
 831         struct netstrfns *nf;
 832         struct nidrange *nr;
 833         int endlen;
 834         unsigned netnum;
 835
 836         if (src->ls_len >= LNET_NIDSTR_SIZE)
 837                 return NULL;
 838
 839         nf = libcfs_namenum2netstrfns(src->ls_str);
 840         if (nf == NULL)
 841                 return NULL;
 842         endlen = src->ls_len - strlen(nf->nf_name);
 843         if (endlen == 0)
 844                 /* network name only, e.g. "elan" or "tcp" */
 845                 netnum = 0;
 846         else {
 847                 /* e.g. "elan25" or "tcp23", refuse to parse if
 848                  * network name is not appended with decimal or
 849                  * hexadecimal number */
 850                 if (!cfs_str2num_check(src->ls_str + strlen(nf->nf_name),
 851                                        endlen, &netnum, 0, MAX_NUMERIC_VALUE))
 852                         return NULL;
 853         }
 854
 855         list_for_each_entry(nr, nidlist, nr_link) {
 856                 if (nr->nr_netstrfns != nf)
 857                         continue;
 858                 if (nr->nr_netnum != netnum)
 859                         continue;
 860                 return nr;
 861         }
 862
 863         nr = calloc(1, sizeof(struct nidrange));
 864         if (nr == NULL)
 865                 return NULL;
 866         list_add_tail(&nr->nr_link, nidlist);
 867         INIT_LIST_HEAD(&nr->nr_addrranges);
 868         nr->nr_netstrfns = nf;
 869         nr->nr_all = 0;
 870         nr->nr_netnum = netnum;
 871
 872         return nr;
 873 }
 874
 875 /**
 876  * Parses \<nidrange\> token of the syntax.
 877  *
 878  * \retval 1 if \a src parses to \<addrrange\> '@' \<net\>
 879  * \retval 0 otherwise
 880  */
 881 static int
 882 parse_nidrange(struct cfs_lstr *src, struct list_head *nidlist)
 883 {
 884         struct cfs_lstr addrrange;
 885         struct cfs_lstr net;
 886         struct cfs_lstr tmp;
 887         struct nidrange *nr;
 888
 889         tmp = *src;
 890         if (cfs_gettok(src, '@', &addrrange) == 0)
 891                 goto failed;
 892
 893         if (cfs_gettok(src, '@', &net) == 0 || src->ls_str != NULL)
 894                 goto failed;
 895
 896         nr = add_nidrange(&net, nidlist);
 897         if (nr == NULL)
 898                 goto failed;
 899
 900         if (parse_addrange(&addrrange, nr) != 0)
 901                 goto failed;
 902
 903         return 1;
 904  failed:
 905         fprintf(stderr, "can't parse nidrange: \"%.*s\"\n",
 906                 tmp.ls_len, tmp.ls_str);
 907         return 0;
 908 }
 909
 910 /**
 911  * Frees addrrange structures of \a list.
 912  *
 913  * For each struct addrrange structure found on \a list it frees
 914  * cfs_expr_list list attached to it and frees the addrrange itself.
 915  *
 916  * \retval none
 917  */
 918 static void
 919 free_addrranges(struct list_head *list)
 920 {
 921         while (!list_empty(list)) {
 922                 struct addrrange *ar;
 923
 924                 ar = list_entry(list->next, struct addrrange, ar_link);
 925
 926                 cfs_expr_list_free_list(&ar->ar_numaddr_ranges);
 927                 list_del(&ar->ar_link);
 928                 free(ar);
 929         }
 930 }
 931
 932 /**
 933  * Frees nidrange strutures of \a list.
 934  *
 935  * For each struct nidrange structure found on \a list it frees
 936  * addrrange list attached to it and frees the nidrange itself.
 937  *
 938  * \retval none
 939  */
 940 void
 941 cfs_free_nidlist(struct list_head *list)
 942 {
 943         struct list_head *pos, *next;
 944         struct nidrange *nr;
 945
 946         list_for_each_safe(pos, next, list) {
 947                 nr = list_entry(pos, struct nidrange, nr_link);
 948                 free_addrranges(&nr->nr_addrranges);
 949                 list_del(pos);
 950                 free(nr);
 951         }
 952 }
 953
 954 /**
 955  * Parses nid range list.
 956  *
 957  * Parses with rigorous syntax and overflow checking \a str into
 958  * \<nidrange\> [ ' ' \<nidrange\> ], compiles \a str into set of
 959  * structures and links that structure to \a nidlist. The resulting
 960  * list can be used to match a NID againts set of NIDS defined by \a
 961  * str.
 962  * \see cfs_match_nid
 963  *
 964  * \retval 1 on success
 965  * \retval 0 otherwise
 966  */
 967 int
 968 cfs_parse_nidlist(char *str, int len, struct list_head *nidlist)
 969 {
 970         struct cfs_lstr src;
 971         struct cfs_lstr res;
 972         int rc;
 973
 974         src.ls_str = str;
 975         src.ls_len = len;
 976         INIT_LIST_HEAD(nidlist);
 977         while (src.ls_str) {
 978                 rc = cfs_gettok(&src, ' ', &res);
 979                 if (rc == 0) {
 980                         cfs_free_nidlist(nidlist);
 981                         return 0;
 982                 }
 983                 rc = parse_nidrange(&res, nidlist);
 984                 if (rc == 0) {
 985                         cfs_free_nidlist(nidlist);
 986                         return 0;
 987                 }
 988         }
 989         return 1;
 990 }
 991
 992 /**
 993  * Matches a nid (\a nid) against the compiled list of nidranges (\a nidlist).
 994  *
 995  * \see cfs_parse_nidlist()
 996  *
 997  * \retval 1 on match
 998  * \retval 0  otherwises
 999  */
1000 int cfs_match_nid(lnet_nid_t nid, struct list_head *nidlist)
1001 {
1002         struct nidrange *nr;
1003         struct addrrange *ar;
1004
1005         list_for_each_entry(nr, nidlist, nr_link) {
1006                 if (nr->nr_netstrfns->nf_type != LNET_NETTYP(LNET_NIDNET(nid)))
1007                         continue;
1008                 if (nr->nr_netnum != LNET_NETNUM(LNET_NIDNET(nid)))
1009                         continue;
1010                 if (nr->nr_all)
1011                         return 1;
1012                 list_for_each_entry(ar, &nr->nr_addrranges, ar_link)
1013                         if (nr->nr_netstrfns->nf_match_addr(LNET_NIDADDR(nid),
1014                                                         &ar->ar_numaddr_ranges))
1015                                 return 1;
1016         }
1017         return 0;
1018 }
1019
1020 /**
1021  * Print the network part of the nidrange \a nr into the specified \a buffer.
1022  *
1023  * \retval number of characters written
1024  */
1025 static int
1026 cfs_print_network(char *buffer, int count, struct nidrange *nr)
1027 {
1028         struct netstrfns *nf = nr->nr_netstrfns;
1029
1030         if (nr->nr_netnum == 0)
1031                 return snprintf(buffer, count, "@%s", nf->nf_name);
1032         else
1033                 return snprintf(buffer, count, "@%s%u",
1034                                     nf->nf_name, nr->nr_netnum);
1035 }
1036
1037
1038 /**
1039  * Print a list of addrrange (\a addrranges) into the specified \a buffer.
1040  * At max \a count characters can be printed into \a buffer.
1041  *
1042  * \retval number of characters written
1043  */
1044 static int
1045 cfs_print_addrranges(char *buffer, int count, struct list_head *addrranges,
1046                      struct nidrange *nr)
1047 {
1048         int i = 0;
1049         struct addrrange *ar;
1050         struct netstrfns *nf = nr->nr_netstrfns;
1051
1052         list_for_each_entry(ar, addrranges, ar_link) {
1053                 if (i != 0)
1054                         i += snprintf(buffer + i, count - i, " ");
1055                 i += nf->nf_print_addrlist(buffer + i, count - i,
1056                                            &ar->ar_numaddr_ranges);
1057                 i += cfs_print_network(buffer + i, count - i, nr);
1058         }
1059         return i;
1060 }
1061
1062 /**
1063  * Print a list of nidranges (\a nidlist) into the specified \a buffer.
1064  * At max \a count characters can be printed into \a buffer.
1065  * Nidranges are separated by a space character.
1066  *
1067  * \retval number of characters written
1068  */
1069 int cfs_print_nidlist(char *buffer, int count, struct list_head *nidlist)
1070 {
1071         int i = 0;
1072         struct nidrange *nr;
1073
1074         if (count <= 0)
1075                 return 0;
1076
1077         list_for_each_entry(nr, nidlist, nr_link) {
1078                 if (i != 0)
1079                         i += snprintf(buffer + i, count - i, " ");
1080
1081                 if (nr->nr_all != 0) {
1082                         assert(list_empty(&nr->nr_addrranges));
1083                         i += snprintf(buffer + i, count - i, "*");
1084                         i += cfs_print_network(buffer + i, count - i, nr);
1085                 } else {
1086                         i += cfs_print_addrranges(buffer + i, count - i,
1087                                                   &nr->nr_addrranges, nr);
1088                 }
1089         }
1090         return i;
1091 }
1092
1093 /**
1094  * Determines minimum and maximum addresses for a single
1095  * numeric address range
1096  *
1097  * \param       ar
1098  * \param       min_nid
1099  * \param       max_nid
1100  */
1101 static void cfs_ip_ar_min_max(struct addrrange *ar, __u32 *min_nid,
1102                               __u32 *max_nid)
1103 {
1104         struct cfs_expr_list    *el;
1105         struct cfs_range_expr   *re;
1106         __u32                   tmp_ip_addr = 0;
1107         unsigned int            min_ip[4] = {0};
1108         unsigned int            max_ip[4] = {0};
1109         int                     re_count = 0;
1110
1111         list_for_each_entry(el, &ar->ar_numaddr_ranges, el_link) {
1112                 list_for_each_entry(re, &el->el_exprs, re_link) {
1113                         min_ip[re_count] = re->re_lo;
1114                         max_ip[re_count] = re->re_hi;
1115                         re_count++;
1116                 }
1117         }
1118
1119         tmp_ip_addr = ((min_ip[0] << 24) | (min_ip[1] << 16) |
1120                        (min_ip[2] << 8) | min_ip[3]);
1121
1122         if (min_nid != NULL)
1123                 *min_nid = tmp_ip_addr;
1124
1125         tmp_ip_addr = ((max_ip[0] << 24) | (max_ip[1] << 16) |
1126                        (max_ip[2] << 8) | max_ip[3]);
1127
1128         if (max_nid != NULL)
1129                 *max_nid = tmp_ip_addr;
1130 }
1131
1132 /**
1133  * Determines minimum and maximum addresses for a single
1134  * numeric address range
1135  *
1136  * \param       ar
1137  * \param       min_nid
1138  * \param       max_nid
1139  */
1140 static void cfs_num_ar_min_max(struct addrrange *ar, __u32 *min_nid,
1141                                __u32 *max_nid)
1142 {
1143         struct cfs_expr_list    *el;
1144         struct cfs_range_expr   *re;
1145         unsigned int            min_addr = 0;
1146         unsigned int            max_addr = 0;
1147
1148         list_for_each_entry(el, &ar->ar_numaddr_ranges, el_link) {
1149                 list_for_each_entry(re, &el->el_exprs, re_link) {
1150                         if (re->re_lo < min_addr || min_addr == 0)
1151                                 min_addr = re->re_lo;
1152                         if (re->re_hi > max_addr)
1153                                 max_addr = re->re_hi;
1154                 }
1155         }
1156
1157         if (min_nid != NULL)
1158                 *min_nid = min_addr;
1159         if (max_nid != NULL)
1160                 *max_nid = max_addr;
1161 }
1162
1163 /**
1164  * Determines whether an expression list in an nidrange contains exactly
1165  * one contiguous address range. Calls the correct netstrfns for the LND
1166  *
1167  * \param       *nidlist
1168  *
1169  * \retval      true if contiguous
1170  * \retval      false if not contiguous
1171  */
1172 bool cfs_nidrange_is_contiguous(struct list_head *nidlist)
1173 {
1174         struct nidrange         *nr;
1175         struct netstrfns        *nf = NULL;
1176         char                    *lndname = NULL;
1177         int                     netnum = -1;
1178
1179         list_for_each_entry(nr, nidlist, nr_link) {
1180                 nf = nr->nr_netstrfns;
1181                 if (lndname == NULL)
1182                         lndname = nf->nf_name;
1183                 if (netnum == -1)
1184                         netnum = nr->nr_netnum;
1185
1186                 if (strcmp(lndname, nf->nf_name) != 0 ||
1187                     netnum != nr->nr_netnum)
1188                         return false;
1189         }
1190
1191         if (nf == NULL)
1192                 return false;
1193
1194         if (!nf->nf_is_contiguous(nidlist))
1195                 return false;
1196
1197         return true;
1198 }
1199
1200 /**
1201  * Determines whether an expression list in an num nidrange contains exactly
1202  * one contiguous address range.
1203  *
1204  * \param       *nidlist
1205  *
1206  * \retval      true if contiguous
1207  * \retval      false if not contiguous
1208  */
1209 static bool cfs_num_is_contiguous(struct list_head *nidlist)
1210 {
1211         struct nidrange         *nr;
1212         struct addrrange        *ar;
1213         struct cfs_expr_list    *el;
1214         struct cfs_range_expr   *re;
1215         int                     last_hi = 0;
1216         __u32                   last_end_nid = 0;
1217         __u32                   current_start_nid = 0;
1218         __u32                   current_end_nid = 0;
1219
1220         list_for_each_entry(nr, nidlist, nr_link) {
1221                 list_for_each_entry(ar, &nr->nr_addrranges, ar_link) {
1222                         cfs_num_ar_min_max(ar, &current_start_nid,
1223                                            &current_end_nid);
1224                         if (last_end_nid != 0 &&
1225                             (current_start_nid - last_end_nid != 1))
1226                                         return false;
1227                         last_end_nid = current_end_nid;
1228                         list_for_each_entry(el, &ar->ar_numaddr_ranges,
1229                                             el_link) {
1230                                 list_for_each_entry(re, &el->el_exprs,
1231                                                     re_link) {
1232                                         if (re->re_stride > 1)
1233                                                 return false;
1234                                         else if (last_hi != 0 &&
1235                                                  re->re_hi - last_hi != 1)
1236                                                 return false;
1237                                         last_hi = re->re_hi;
1238                                 }
1239                         }
1240                 }
1241         }
1242
1243         return true;
1244 }
1245
1246 /**
1247  * Determines whether an expression list in an ip nidrange contains exactly
1248  * one contiguous address range.
1249  *
1250  * \param       *nidlist
1251  *
1252  * \retval      true if contiguous
1253  * \retval      false if not contiguous
1254  */
1255 static bool cfs_ip_is_contiguous(struct list_head *nidlist)
1256 {
1257         struct nidrange         *nr;
1258         struct addrrange        *ar;
1259         struct cfs_expr_list    *el;
1260         struct cfs_range_expr   *re;
1261         int                     expr_count;
1262         int                     last_hi = 255;
1263         int                     last_diff = 0;
1264         __u32                   last_end_nid = 0;
1265         __u32                   current_start_nid = 0;
1266         __u32                   current_end_nid = 0;
1267
1268         list_for_each_entry(nr, nidlist, nr_link) {
1269                 list_for_each_entry(ar, &nr->nr_addrranges, ar_link) {
1270                         last_hi = 255;
1271                         last_diff = 0;
1272                         cfs_ip_ar_min_max(ar, &current_start_nid,
1273                                           &current_end_nid);
1274                         if (last_end_nid != 0 &&
1275                             (current_start_nid - last_end_nid != 1))
1276                                         return false;
1277                         last_end_nid = current_end_nid;
1278                         list_for_each_entry(el,
1279                                             &ar->ar_numaddr_ranges,
1280                                             el_link) {
1281                                 expr_count = 0;
1282                                 list_for_each_entry(re, &el->el_exprs,
1283                                                     re_link) {
1284                                         expr_count++;
1285                                         if (re->re_stride > 1 ||
1286                                             (last_diff > 0 && last_hi != 255) ||
1287                                             (last_diff > 0 && last_hi == 255 &&
1288                                              re->re_lo > 0))
1289                                                 return false;
1290                                         last_hi = re->re_hi;
1291                                         last_diff = re->re_hi - re->re_lo;
1292                                 }
1293                         }
1294                 }
1295         }
1296
1297         return true;
1298 }
1299
1300 /**
1301  * Takes a linked list of nidrange expressions, determines the minimum
1302  * and maximum nid and creates appropriate nid structures
1303  *
1304  * \param       *nidlist
1305  * \param       *min_nid
1306  * \param       *max_nid
1307  */
1308 void cfs_nidrange_find_min_max(struct list_head *nidlist, char *min_nid,
1309                                char *max_nid, size_t nidstr_length)
1310 {
1311         struct nidrange         *nr;
1312         struct netstrfns        *nf = NULL;
1313         int                     netnum = -1;
1314         __u32                   min_addr;
1315         __u32                   max_addr;
1316         char                    *lndname = NULL;
1317         char                    min_addr_str[IPSTRING_LENGTH];
1318         char                    max_addr_str[IPSTRING_LENGTH];
1319
1320         list_for_each_entry(nr, nidlist, nr_link) {
1321                 nf = nr->nr_netstrfns;
1322                 lndname = nf->nf_name;
1323                 if (netnum == -1)
1324                         netnum = nr->nr_netnum;
1325
1326                 nf->nf_min_max(nidlist, &min_addr, &max_addr);
1327         }
1328         nf->nf_addr2str(min_addr, min_addr_str, sizeof(min_addr_str));
1329         nf->nf_addr2str(max_addr, max_addr_str, sizeof(max_addr_str));
1330
1331         snprintf(min_nid, nidstr_length, "%s@%s%d", min_addr_str, lndname,
1332                  netnum);
1333         snprintf(max_nid, nidstr_length, "%s@%s%d", max_addr_str, lndname,
1334                  netnum);
1335 }
1336
1337 /**
1338  * Determines the min and max NID values for num LNDs
1339  *
1340  * \param       *nidlist
1341  * \param       *min_nid
1342  * \param       *max_nid
1343  */
1344 static void cfs_num_min_max(struct list_head *nidlist, __u32 *min_nid,
1345                             __u32 *max_nid)
1346 {
1347         struct nidrange         *nr;
1348         struct addrrange        *ar;
1349         unsigned int            tmp_min_addr = 0;
1350         unsigned int            tmp_max_addr = 0;
1351         unsigned int            min_addr = 0;
1352         unsigned int            max_addr = 0;
1353
1354         list_for_each_entry(nr, nidlist, nr_link) {
1355                 list_for_each_entry(ar, &nr->nr_addrranges, ar_link) {
1356                         cfs_num_ar_min_max(ar, &tmp_min_addr,
1357                                            &tmp_max_addr);
1358                         if (tmp_min_addr < min_addr || min_addr == 0)
1359                                 min_addr = tmp_min_addr;
1360                         if (tmp_max_addr > max_addr)
1361                                 max_addr = tmp_min_addr;
1362                 }
1363         }
1364         *max_nid = max_addr;
1365         *min_nid = min_addr;
1366 }
1367
1368 /**
1369  * Takes an nidlist and determines the minimum and maximum
1370  * ip addresses.
1371  *
1372  * \param       *nidlist
1373  * \param       *min_nid
1374  * \param       *max_nid
1375  */
1376 static void cfs_ip_min_max(struct list_head *nidlist, __u32 *min_nid,
1377                            __u32 *max_nid)
1378 {
1379         struct nidrange         *nr;
1380         struct addrrange        *ar;
1381         __u32                   tmp_min_ip_addr = 0;
1382         __u32                   tmp_max_ip_addr = 0;
1383         __u32                   min_ip_addr = 0;
1384         __u32                   max_ip_addr = 0;
1385
1386         list_for_each_entry(nr, nidlist, nr_link) {
1387                 list_for_each_entry(ar, &nr->nr_addrranges, ar_link) {
1388                         cfs_ip_ar_min_max(ar, &tmp_min_ip_addr,
1389                                           &tmp_max_ip_addr);
1390                         if (tmp_min_ip_addr < min_ip_addr || min_ip_addr == 0)
1391                                 min_ip_addr = tmp_min_ip_addr;
1392                         if (tmp_max_ip_addr > max_ip_addr)
1393                                 max_ip_addr = tmp_max_ip_addr;
1394                 }
1395         }
1396
1397         if (min_nid != NULL)
1398                 *min_nid = min_ip_addr;
1399         if (max_nid != NULL)
1400                 *max_nid = max_ip_addr;
1401 }