net/tipc/netlink_compat.c

   1 /*
   2  * Copyright (c) 2014, Ericsson AB
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the names of the copyright holders nor the names of its
  14  *    contributors may be used to endorse or promote products derived from
  15  *    this software without specific prior written permission.
  16  *
  17  * Alternatively, this software may be distributed under the terms of the
  18  * GNU General Public License ("GPL") version 2 as published by the Free
  19  * Software Foundation.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  25  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31  * POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include "core.h"
  35 #include "bearer.h"
  36 #include "link.h"
  37 #include "name_table.h"
  38 #include "socket.h"
  39 #include "node.h"
  40 #include "net.h"
  41 #include <net/genetlink.h>
  42 #include <linux/tipc_config.h>
  43
  44 /* The legacy API had an artificial message length limit called
  45  * ULTRA_STRING_MAX_LEN.
  46  */
  47 #define ULTRA_STRING_MAX_LEN 32768
  48
  49 #define TIPC_SKB_MAX TLV_SPACE(ULTRA_STRING_MAX_LEN)
  50
  51 #define REPLY_TRUNCATED "<truncated>\n"
  52
  53 struct tipc_nl_compat_msg {
  54         u16 cmd;
  55         int rep_type;
  56         int rep_size;
  57         int req_type;
  58         int req_size;
  59         struct net *net;
  60         struct sk_buff *rep;
  61         struct tlv_desc *req;
  62         struct sock *dst_sk;
  63 };
  64
  65 struct tipc_nl_compat_cmd_dump {
  66         int (*header)(struct tipc_nl_compat_msg *);
  67         int (*dumpit)(struct sk_buff *, struct netlink_callback *);
  68         int (*format)(struct tipc_nl_compat_msg *msg, struct nlattr **attrs);
  69 };
  70
  71 struct tipc_nl_compat_cmd_doit {
  72         int (*doit)(struct sk_buff *skb, struct genl_info *info);
  73         int (*transcode)(struct tipc_nl_compat_cmd_doit *cmd,
  74                          struct sk_buff *skb, struct tipc_nl_compat_msg *msg);
  75 };
  76
  77 static int tipc_skb_tailroom(struct sk_buff *skb)
  78 {
  79         int tailroom;
  80         int limit;
  81
  82         tailroom = skb_tailroom(skb);
  83         limit = TIPC_SKB_MAX - skb->len;
  84
  85         if (tailroom < limit)
  86                 return tailroom;
  87
  88         return limit;
  89 }
  90
  91 static inline int TLV_GET_DATA_LEN(struct tlv_desc *tlv)
  92 {
  93         return TLV_GET_LEN(tlv) - TLV_SPACE(0);
  94 }
  95
  96 static int tipc_add_tlv(struct sk_buff *skb, u16 type, void *data, u16 len)
  97 {
  98         struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(skb);
  99
 100         if (tipc_skb_tailroom(skb) < TLV_SPACE(len))
 101                 return -EMSGSIZE;
 102
 103         skb_put(skb, TLV_SPACE(len));
 104         tlv->tlv_type = htons(type);
 105         tlv->tlv_len = htons(TLV_LENGTH(len));
 106         if (len && data)
 107                 memcpy(TLV_DATA(tlv), data, len);
 108
 109         return 0;
 110 }
 111
 112 static void tipc_tlv_init(struct sk_buff *skb, u16 type)
 113 {
 114         struct tlv_desc *tlv = (struct tlv_desc *)skb->data;
 115
 116         TLV_SET_LEN(tlv, 0);
 117         TLV_SET_TYPE(tlv, type);
 118         skb_put(skb, sizeof(struct tlv_desc));
 119 }
 120
 121 static int tipc_tlv_sprintf(struct sk_buff *skb, const char *fmt, ...)
 122 {
 123         int n;
 124         u16 len;
 125         u32 rem;
 126         char *buf;
 127         struct tlv_desc *tlv;
 128         va_list args;
 129
 130         rem = tipc_skb_tailroom(skb);
 131
 132         tlv = (struct tlv_desc *)skb->data;
 133         len = TLV_GET_LEN(tlv);
 134         buf = TLV_DATA(tlv) + len;
 135
 136         va_start(args, fmt);
 137         n = vscnprintf(buf, rem, fmt, args);
 138         va_end(args);
 139
 140         TLV_SET_LEN(tlv, n + len);
 141         skb_put(skb, n);
 142
 143         return n;
 144 }
 145
 146 static struct sk_buff *tipc_tlv_alloc(int size)
 147 {
 148         int hdr_len;
 149         struct sk_buff *buf;
 150
 151         size = TLV_SPACE(size);
 152         hdr_len = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN);
 153
 154         buf = alloc_skb(hdr_len + size, GFP_KERNEL);
 155         if (!buf)
 156                 return NULL;
 157
 158         skb_reserve(buf, hdr_len);
 159
 160         return buf;
 161 }
 162
 163 static struct sk_buff *tipc_get_err_tlv(char *str)
 164 {
 165         int str_len = strlen(str) + 1;
 166         struct sk_buff *buf;
 167
 168         buf = tipc_tlv_alloc(TLV_SPACE(str_len));
 169         if (buf)
 170                 tipc_add_tlv(buf, TIPC_TLV_ERROR_STRING, str, str_len);
 171
 172         return buf;
 173 }
 174
 175 static inline bool string_is_valid(char *s, int len)
 176 {
 177         return memchr(s, '\0', len) ? true : false;
 178 }
 179
 180 static int __tipc_nl_compat_dumpit(struct tipc_nl_compat_cmd_dump *cmd,
 181                                    struct tipc_nl_compat_msg *msg,
 182                                    struct sk_buff *arg)
 183 {
 184         struct genl_dumpit_info info;
 185         int len = 0;
 186         int err;
 187         struct sk_buff *buf;
 188         struct nlmsghdr *nlmsg;
 189         struct netlink_callback cb;
 190         struct nlattr **attrbuf;
 191
 192         memset(&cb, 0, sizeof(cb));
 193         cb.nlh = (struct nlmsghdr *)arg->data;
 194         cb.skb = arg;
 195         cb.data = &info;
 196
 197         buf = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 198         if (!buf)
 199                 return -ENOMEM;
 200
 201         buf->sk = msg->dst_sk;
 202         if (__tipc_dump_start(&cb, msg->net)) {
 203                 kfree_skb(buf);
 204                 return -ENOMEM;
 205         }
 206
 207         attrbuf = kcalloc(tipc_genl_family.maxattr + 1,
 208                           sizeof(struct nlattr *), GFP_KERNEL);
 209         if (!attrbuf) {
 210                 err = -ENOMEM;
 211                 goto err_out;
 212         }
 213
 214         info.attrs = attrbuf;
 215         err = nlmsg_parse_deprecated(cb.nlh, GENL_HDRLEN, attrbuf,
 216                                      tipc_genl_family.maxattr,
 217                                      tipc_genl_family.policy, NULL);
 218         if (err)
 219                 goto err_out;
 220
 221         do {
 222                 int rem;
 223
 224                 len = (*cmd->dumpit)(buf, &cb);
 225
 226                 nlmsg_for_each_msg(nlmsg, nlmsg_hdr(buf), len, rem) {
 227                         err = nlmsg_parse_deprecated(nlmsg, GENL_HDRLEN,
 228                                                      attrbuf,
 229                                                      tipc_genl_family.maxattr,
 230                                                      tipc_genl_family.policy,
 231                                                      NULL);
 232                         if (err)
 233                                 goto err_out;
 234
 235                         err = (*cmd->format)(msg, attrbuf);
 236                         if (err)
 237                                 goto err_out;
 238
 239                         if (tipc_skb_tailroom(msg->rep) <= 1) {
 240                                 err = -EMSGSIZE;
 241                                 goto err_out;
 242                         }
 243                 }
 244
 245                 skb_reset_tail_pointer(buf);
 246                 buf->len = 0;
 247
 248         } while (len);
 249
 250         err = 0;
 251
 252 err_out:
 253         kfree(attrbuf);
 254         tipc_dump_done(&cb);
 255         kfree_skb(buf);
 256
 257         if (err == -EMSGSIZE) {
 258                 /* The legacy API only considered messages filling
 259                  * "ULTRA_STRING_MAX_LEN" to be truncated.
 260                  */
 261                 if ((TIPC_SKB_MAX - msg->rep->len) <= 1) {
 262                         char *tail = skb_tail_pointer(msg->rep);
 263
 264                         if (*tail != '\0')
 265                                 sprintf(tail - sizeof(REPLY_TRUNCATED) - 1,
 266                                         REPLY_TRUNCATED);
 267                 }
 268
 269                 return 0;
 270         }
 271
 272         return err;
 273 }
 274
 275 static int tipc_nl_compat_dumpit(struct tipc_nl_compat_cmd_dump *cmd,
 276                                  struct tipc_nl_compat_msg *msg)
 277 {
 278         int err;
 279         struct sk_buff *arg;
 280
 281         if (msg->req_type && (!msg->req_size ||
 282                               !TLV_CHECK_TYPE(msg->req, msg->req_type)))
 283                 return -EINVAL;
 284
 285         msg->rep = tipc_tlv_alloc(msg->rep_size);
 286         if (!msg->rep)
 287                 return -ENOMEM;
 288
 289         if (msg->rep_type)
 290                 tipc_tlv_init(msg->rep, msg->rep_type);
 291
 292         if (cmd->header) {
 293                 err = (*cmd->header)(msg);
 294                 if (err) {
 295                         kfree_skb(msg->rep);
 296                         msg->rep = NULL;
 297                         return err;
 298                 }
 299         }
 300
 301         arg = nlmsg_new(0, GFP_KERNEL);
 302         if (!arg) {
 303                 kfree_skb(msg->rep);
 304                 msg->rep = NULL;
 305                 return -ENOMEM;
 306         }
 307
 308         err = __tipc_nl_compat_dumpit(cmd, msg, arg);
 309         if (err) {
 310                 kfree_skb(msg->rep);
 311                 msg->rep = NULL;
 312         }
 313         kfree_skb(arg);
 314
 315         return err;
 316 }
 317
 318 static int __tipc_nl_compat_doit(struct tipc_nl_compat_cmd_doit *cmd,
 319                                  struct tipc_nl_compat_msg *msg)
 320 {
 321         int err;
 322         struct sk_buff *doit_buf;
 323         struct sk_buff *trans_buf;
 324         struct nlattr **attrbuf;
 325         struct genl_info info;
 326
 327         trans_buf = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 328         if (!trans_buf)
 329                 return -ENOMEM;
 330
 331         attrbuf = kmalloc_array(tipc_genl_family.maxattr + 1,
 332                                 sizeof(struct nlattr *),
 333                                 GFP_KERNEL);
 334         if (!attrbuf) {
 335                 err = -ENOMEM;
 336                 goto trans_out;
 337         }
 338
 339         doit_buf = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 340         if (!doit_buf) {
 341                 err = -ENOMEM;
 342                 goto attrbuf_out;
 343         }
 344
 345         memset(&info, 0, sizeof(info));
 346         info.attrs = attrbuf;
 347
 348         rtnl_lock();
 349         err = (*cmd->transcode)(cmd, trans_buf, msg);
 350         if (err)
 351                 goto doit_out;
 352
 353         err = nla_parse_deprecated(attrbuf, tipc_genl_family.maxattr,
 354                                    (const struct nlattr *)trans_buf->data,
 355                                    trans_buf->len, NULL, NULL);
 356         if (err)
 357                 goto doit_out;
 358
 359         doit_buf->sk = msg->dst_sk;
 360
 361         err = (*cmd->doit)(doit_buf, &info);
 362 doit_out:
 363         rtnl_unlock();
 364
 365         kfree_skb(doit_buf);
 366 attrbuf_out:
 367         kfree(attrbuf);
 368 trans_out:
 369         kfree_skb(trans_buf);
 370
 371         return err;
 372 }
 373
 374 static int tipc_nl_compat_doit(struct tipc_nl_compat_cmd_doit *cmd,
 375                                struct tipc_nl_compat_msg *msg)
 376 {
 377         int err;
 378
 379         if (msg->req_type && (!msg->req_size ||
 380                               !TLV_CHECK_TYPE(msg->req, msg->req_type)))
 381                 return -EINVAL;
 382
 383         err = __tipc_nl_compat_doit(cmd, msg);
 384         if (err)
 385                 return err;
 386
 387         /* The legacy API considered an empty message a success message */
 388         msg->rep = tipc_tlv_alloc(0);
 389         if (!msg->rep)
 390                 return -ENOMEM;
 391
 392         return 0;
 393 }
 394
 395 static int tipc_nl_compat_bearer_dump(struct tipc_nl_compat_msg *msg,
 396                                       struct nlattr **attrs)
 397 {
 398         struct nlattr *bearer[TIPC_NLA_BEARER_MAX + 1];
 399         int err;
 400
 401         if (!attrs[TIPC_NLA_BEARER])
 402                 return -EINVAL;
 403
 404         err = nla_parse_nested_deprecated(bearer, TIPC_NLA_BEARER_MAX,
 405                                           attrs[TIPC_NLA_BEARER], NULL, NULL);
 406         if (err)
 407                 return err;
 408
 409         return tipc_add_tlv(msg->rep, TIPC_TLV_BEARER_NAME,
 410                             nla_data(bearer[TIPC_NLA_BEARER_NAME]),
 411                             nla_len(bearer[TIPC_NLA_BEARER_NAME]));
 412 }
 413
 414 static int tipc_nl_compat_bearer_enable(struct tipc_nl_compat_cmd_doit *cmd,
 415                                         struct sk_buff *skb,
 416                                         struct tipc_nl_compat_msg *msg)
 417 {
 418         struct nlattr *prop;
 419         struct nlattr *bearer;
 420         struct tipc_bearer_config *b;
 421         int len;
 422
 423         b = (struct tipc_bearer_config *)TLV_DATA(msg->req);
 424
 425         bearer = nla_nest_start_noflag(skb, TIPC_NLA_BEARER);
 426         if (!bearer)
 427                 return -EMSGSIZE;
 428
 429         len = TLV_GET_DATA_LEN(msg->req);
 430         len -= offsetof(struct tipc_bearer_config, name);
 431         if (len <= 0)
 432                 return -EINVAL;
 433
 434         len = min_t(int, len, TIPC_MAX_BEARER_NAME);
 435         if (!string_is_valid(b->name, len))
 436                 return -EINVAL;
 437
 438         if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, b->name))
 439                 return -EMSGSIZE;
 440
 441         if (nla_put_u32(skb, TIPC_NLA_BEARER_DOMAIN, ntohl(b->disc_domain)))
 442                 return -EMSGSIZE;
 443
 444         if (ntohl(b->priority) <= TIPC_MAX_LINK_PRI) {
 445                 prop = nla_nest_start_noflag(skb, TIPC_NLA_BEARER_PROP);
 446                 if (!prop)
 447                         return -EMSGSIZE;
 448                 if (nla_put_u32(skb, TIPC_NLA_PROP_PRIO, ntohl(b->priority)))
 449                         return -EMSGSIZE;
 450                 nla_nest_end(skb, prop);
 451         }
 452         nla_nest_end(skb, bearer);
 453
 454         return 0;
 455 }
 456
 457 static int tipc_nl_compat_bearer_disable(struct tipc_nl_compat_cmd_doit *cmd,
 458                                          struct sk_buff *skb,
 459                                          struct tipc_nl_compat_msg *msg)
 460 {
 461         char *name;
 462         struct nlattr *bearer;
 463         int len;
 464
 465         name = (char *)TLV_DATA(msg->req);
 466
 467         bearer = nla_nest_start_noflag(skb, TIPC_NLA_BEARER);
 468         if (!bearer)
 469                 return -EMSGSIZE;
 470
 471         len = TLV_GET_DATA_LEN(msg->req);
 472         if (len <= 0)
 473                 return -EINVAL;
 474
 475         len = min_t(int, len, TIPC_MAX_BEARER_NAME);
 476         if (!string_is_valid(name, len))
 477                 return -EINVAL;
 478
 479         if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, name))
 480                 return -EMSGSIZE;
 481
 482         nla_nest_end(skb, bearer);
 483
 484         return 0;
 485 }
 486
 487 static inline u32 perc(u32 count, u32 total)
 488 {
 489         return (count * 100 + (total / 2)) / total;
 490 }
 491
 492 static void __fill_bc_link_stat(struct tipc_nl_compat_msg *msg,
 493                                 struct nlattr *prop[], struct nlattr *stats[])
 494 {
 495         tipc_tlv_sprintf(msg->rep, "  Window:%u packets\n",
 496                          nla_get_u32(prop[TIPC_NLA_PROP_WIN]));
 497
 498         tipc_tlv_sprintf(msg->rep,
 499                          "  RX packets:%u fragments:%u/%u bundles:%u/%u\n",
 500                          nla_get_u32(stats[TIPC_NLA_STATS_RX_INFO]),
 501                          nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTS]),
 502                          nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTED]),
 503                          nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLES]),
 504                          nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLED]));
 505
 506         tipc_tlv_sprintf(msg->rep,
 507                          "  TX packets:%u fragments:%u/%u bundles:%u/%u\n",
 508                          nla_get_u32(stats[TIPC_NLA_STATS_TX_INFO]),
 509                          nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTS]),
 510                          nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTED]),
 511                          nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLES]),
 512                          nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLED]));
 513
 514         tipc_tlv_sprintf(msg->rep, "  RX naks:%u defs:%u dups:%u\n",
 515                          nla_get_u32(stats[TIPC_NLA_STATS_RX_NACKS]),
 516                          nla_get_u32(stats[TIPC_NLA_STATS_RX_DEFERRED]),
 517                          nla_get_u32(stats[TIPC_NLA_STATS_DUPLICATES]));
 518
 519         tipc_tlv_sprintf(msg->rep, "  TX naks:%u acks:%u dups:%u\n",
 520                          nla_get_u32(stats[TIPC_NLA_STATS_TX_NACKS]),
 521                          nla_get_u32(stats[TIPC_NLA_STATS_TX_ACKS]),
 522                          nla_get_u32(stats[TIPC_NLA_STATS_RETRANSMITTED]));
 523
 524         tipc_tlv_sprintf(msg->rep,
 525                          "  Congestion link:%u  Send queue max:%u avg:%u",
 526                          nla_get_u32(stats[TIPC_NLA_STATS_LINK_CONGS]),
 527                          nla_get_u32(stats[TIPC_NLA_STATS_MAX_QUEUE]),
 528                          nla_get_u32(stats[TIPC_NLA_STATS_AVG_QUEUE]));
 529 }
 530
 531 static int tipc_nl_compat_link_stat_dump(struct tipc_nl_compat_msg *msg,
 532                                          struct nlattr **attrs)
 533 {
 534         char *name;
 535         struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
 536         struct nlattr *prop[TIPC_NLA_PROP_MAX + 1];
 537         struct nlattr *stats[TIPC_NLA_STATS_MAX + 1];
 538         int err;
 539         int len;
 540
 541         if (!attrs[TIPC_NLA_LINK])
 542                 return -EINVAL;
 543
 544         err = nla_parse_nested_deprecated(link, TIPC_NLA_LINK_MAX,
 545                                           attrs[TIPC_NLA_LINK], NULL, NULL);
 546         if (err)
 547                 return err;
 548
 549         if (!link[TIPC_NLA_LINK_PROP])
 550                 return -EINVAL;
 551
 552         err = nla_parse_nested_deprecated(prop, TIPC_NLA_PROP_MAX,
 553                                           link[TIPC_NLA_LINK_PROP], NULL,
 554                                           NULL);
 555         if (err)
 556                 return err;
 557
 558         if (!link[TIPC_NLA_LINK_STATS])
 559                 return -EINVAL;
 560
 561         err = nla_parse_nested_deprecated(stats, TIPC_NLA_STATS_MAX,
 562                                           link[TIPC_NLA_LINK_STATS], NULL,
 563                                           NULL);
 564         if (err)
 565                 return err;
 566
 567         name = (char *)TLV_DATA(msg->req);
 568
 569         len = TLV_GET_DATA_LEN(msg->req);
 570         if (len <= 0)
 571                 return -EINVAL;
 572
 573         len = min_t(int, len, TIPC_MAX_LINK_NAME);
 574         if (!string_is_valid(name, len))
 575                 return -EINVAL;
 576
 577         if (strcmp(name, nla_data(link[TIPC_NLA_LINK_NAME])) != 0)
 578                 return 0;
 579
 580         tipc_tlv_sprintf(msg->rep, "\nLink <%s>\n",
 581                          nla_data(link[TIPC_NLA_LINK_NAME]));
 582
 583         if (link[TIPC_NLA_LINK_BROADCAST]) {
 584                 __fill_bc_link_stat(msg, prop, stats);
 585                 return 0;
 586         }
 587
 588         if (link[TIPC_NLA_LINK_ACTIVE])
 589                 tipc_tlv_sprintf(msg->rep, "  ACTIVE");
 590         else if (link[TIPC_NLA_LINK_UP])
 591                 tipc_tlv_sprintf(msg->rep, "  STANDBY");
 592         else
 593                 tipc_tlv_sprintf(msg->rep, "  DEFUNCT");
 594
 595         tipc_tlv_sprintf(msg->rep, "  MTU:%u  Priority:%u",
 596                          nla_get_u32(link[TIPC_NLA_LINK_MTU]),
 597                          nla_get_u32(prop[TIPC_NLA_PROP_PRIO]));
 598
 599         tipc_tlv_sprintf(msg->rep, "  Tolerance:%u ms  Window:%u packets\n",
 600                          nla_get_u32(prop[TIPC_NLA_PROP_TOL]),
 601                          nla_get_u32(prop[TIPC_NLA_PROP_WIN]));
 602
 603         tipc_tlv_sprintf(msg->rep,
 604                          "  RX packets:%u fragments:%u/%u bundles:%u/%u\n",
 605                          nla_get_u32(link[TIPC_NLA_LINK_RX]) -
 606                          nla_get_u32(stats[TIPC_NLA_STATS_RX_INFO]),
 607                          nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTS]),
 608                          nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTED]),
 609                          nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLES]),
 610                          nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLED]));
 611
 612         tipc_tlv_sprintf(msg->rep,
 613                          "  TX packets:%u fragments:%u/%u bundles:%u/%u\n",
 614                          nla_get_u32(link[TIPC_NLA_LINK_TX]) -
 615                          nla_get_u32(stats[TIPC_NLA_STATS_TX_INFO]),
 616                          nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTS]),
 617                          nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTED]),
 618                          nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLES]),
 619                          nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLED]));
 620
 621         tipc_tlv_sprintf(msg->rep,
 622                          "  TX profile sample:%u packets  average:%u octets\n",
 623                          nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_CNT]),
 624                          nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_TOT]) /
 625                          nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT]));
 626
 627         tipc_tlv_sprintf(msg->rep,
 628                          "  0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% ",
 629                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P0]),
 630                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 631                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P1]),
 632                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 633                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P2]),
 634                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 635                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P3]),
 636                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])));
 637
 638         tipc_tlv_sprintf(msg->rep, "-16384:%u%% -32768:%u%% -66000:%u%%\n",
 639                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P4]),
 640                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 641                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P5]),
 642                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 643                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P6]),
 644                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])));
 645
 646         tipc_tlv_sprintf(msg->rep,
 647                          "  RX states:%u probes:%u naks:%u defs:%u dups:%u\n",
 648                          nla_get_u32(stats[TIPC_NLA_STATS_RX_STATES]),
 649                          nla_get_u32(stats[TIPC_NLA_STATS_RX_PROBES]),
 650                          nla_get_u32(stats[TIPC_NLA_STATS_RX_NACKS]),
 651                          nla_get_u32(stats[TIPC_NLA_STATS_RX_DEFERRED]),
 652                          nla_get_u32(stats[TIPC_NLA_STATS_DUPLICATES]));
 653
 654         tipc_tlv_sprintf(msg->rep,
 655                          "  TX states:%u probes:%u naks:%u acks:%u dups:%u\n",
 656                          nla_get_u32(stats[TIPC_NLA_STATS_TX_STATES]),
 657                          nla_get_u32(stats[TIPC_NLA_STATS_TX_PROBES]),
 658                          nla_get_u32(stats[TIPC_NLA_STATS_TX_NACKS]),
 659                          nla_get_u32(stats[TIPC_NLA_STATS_TX_ACKS]),
 660                          nla_get_u32(stats[TIPC_NLA_STATS_RETRANSMITTED]));
 661
 662         tipc_tlv_sprintf(msg->rep,
 663                          "  Congestion link:%u  Send queue max:%u avg:%u",
 664                          nla_get_u32(stats[TIPC_NLA_STATS_LINK_CONGS]),
 665                          nla_get_u32(stats[TIPC_NLA_STATS_MAX_QUEUE]),
 666                          nla_get_u32(stats[TIPC_NLA_STATS_AVG_QUEUE]));
 667
 668         return 0;
 669 }
 670
 671 static int tipc_nl_compat_link_dump(struct tipc_nl_compat_msg *msg,
 672                                     struct nlattr **attrs)
 673 {
 674         struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
 675         struct tipc_link_info link_info;
 676         int err;
 677
 678         if (!attrs[TIPC_NLA_LINK])
 679                 return -EINVAL;
 680
 681         err = nla_parse_nested_deprecated(link, TIPC_NLA_LINK_MAX,
 682                                           attrs[TIPC_NLA_LINK], NULL, NULL);
 683         if (err)
 684                 return err;
 685
 686         link_info.dest = nla_get_flag(link[TIPC_NLA_LINK_DEST]);
 687         link_info.up = htonl(nla_get_flag(link[TIPC_NLA_LINK_UP]));
 688         nla_strlcpy(link_info.str, link[TIPC_NLA_LINK_NAME],
 689                     TIPC_MAX_LINK_NAME);
 690
 691         return tipc_add_tlv(msg->rep, TIPC_TLV_LINK_INFO,
 692                             &link_info, sizeof(link_info));
 693 }
 694
 695 static int __tipc_add_link_prop(struct sk_buff *skb,
 696                                 struct tipc_nl_compat_msg *msg,
 697                                 struct tipc_link_config *lc)
 698 {
 699         switch (msg->cmd) {
 700         case TIPC_CMD_SET_LINK_PRI:
 701                 return nla_put_u32(skb, TIPC_NLA_PROP_PRIO, ntohl(lc->value));
 702         case TIPC_CMD_SET_LINK_TOL:
 703                 return nla_put_u32(skb, TIPC_NLA_PROP_TOL, ntohl(lc->value));
 704         case TIPC_CMD_SET_LINK_WINDOW:
 705                 return nla_put_u32(skb, TIPC_NLA_PROP_WIN, ntohl(lc->value));
 706         }
 707
 708         return -EINVAL;
 709 }
 710
 711 static int tipc_nl_compat_media_set(struct sk_buff *skb,
 712                                     struct tipc_nl_compat_msg *msg)
 713 {
 714         struct nlattr *prop;
 715         struct nlattr *media;
 716         struct tipc_link_config *lc;
 717
 718         lc = (struct tipc_link_config *)TLV_DATA(msg->req);
 719
 720         media = nla_nest_start_noflag(skb, TIPC_NLA_MEDIA);
 721         if (!media)
 722                 return -EMSGSIZE;
 723
 724         if (nla_put_string(skb, TIPC_NLA_MEDIA_NAME, lc->name))
 725                 return -EMSGSIZE;
 726
 727         prop = nla_nest_start_noflag(skb, TIPC_NLA_MEDIA_PROP);
 728         if (!prop)
 729                 return -EMSGSIZE;
 730
 731         __tipc_add_link_prop(skb, msg, lc);
 732         nla_nest_end(skb, prop);
 733         nla_nest_end(skb, media);
 734
 735         return 0;
 736 }
 737
 738 static int tipc_nl_compat_bearer_set(struct sk_buff *skb,
 739                                      struct tipc_nl_compat_msg *msg)
 740 {
 741         struct nlattr *prop;
 742         struct nlattr *bearer;
 743         struct tipc_link_config *lc;
 744
 745         lc = (struct tipc_link_config *)TLV_DATA(msg->req);
 746
 747         bearer = nla_nest_start_noflag(skb, TIPC_NLA_BEARER);
 748         if (!bearer)
 749                 return -EMSGSIZE;
 750
 751         if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, lc->name))
 752                 return -EMSGSIZE;
 753
 754         prop = nla_nest_start_noflag(skb, TIPC_NLA_BEARER_PROP);
 755         if (!prop)
 756                 return -EMSGSIZE;
 757
 758         __tipc_add_link_prop(skb, msg, lc);
 759         nla_nest_end(skb, prop);
 760         nla_nest_end(skb, bearer);
 761
 762         return 0;
 763 }
 764
 765 static int __tipc_nl_compat_link_set(struct sk_buff *skb,
 766                                      struct tipc_nl_compat_msg *msg)
 767 {
 768         struct nlattr *prop;
 769         struct nlattr *link;
 770         struct tipc_link_config *lc;
 771
 772         lc = (struct tipc_link_config *)TLV_DATA(msg->req);
 773
 774         link = nla_nest_start_noflag(skb, TIPC_NLA_LINK);
 775         if (!link)
 776                 return -EMSGSIZE;
 777
 778         if (nla_put_string(skb, TIPC_NLA_LINK_NAME, lc->name))
 779                 return -EMSGSIZE;
 780
 781         prop = nla_nest_start_noflag(skb, TIPC_NLA_LINK_PROP);
 782         if (!prop)
 783                 return -EMSGSIZE;
 784
 785         __tipc_add_link_prop(skb, msg, lc);
 786         nla_nest_end(skb, prop);
 787         nla_nest_end(skb, link);
 788
 789         return 0;
 790 }
 791
 792 static int tipc_nl_compat_link_set(struct tipc_nl_compat_cmd_doit *cmd,
 793                                    struct sk_buff *skb,
 794                                    struct tipc_nl_compat_msg *msg)
 795 {
 796         struct tipc_link_config *lc;
 797         struct tipc_bearer *bearer;
 798         struct tipc_media *media;
 799         int len;
 800
 801         lc = (struct tipc_link_config *)TLV_DATA(msg->req);
 802
 803         len = TLV_GET_DATA_LEN(msg->req);
 804         len -= offsetof(struct tipc_link_config, name);
 805         if (len <= 0)
 806                 return -EINVAL;
 807
 808         len = min_t(int, len, TIPC_MAX_LINK_NAME);
 809         if (!string_is_valid(lc->name, len))
 810                 return -EINVAL;
 811
 812         media = tipc_media_find(lc->name);
 813         if (media) {
 814                 cmd->doit = &__tipc_nl_media_set;
 815                 return tipc_nl_compat_media_set(skb, msg);
 816         }
 817
 818         bearer = tipc_bearer_find(msg->net, lc->name);
 819         if (bearer) {
 820                 cmd->doit = &__tipc_nl_bearer_set;
 821                 return tipc_nl_compat_bearer_set(skb, msg);
 822         }
 823
 824         return __tipc_nl_compat_link_set(skb, msg);
 825 }
 826
 827 static int tipc_nl_compat_link_reset_stats(struct tipc_nl_compat_cmd_doit *cmd,
 828                                            struct sk_buff *skb,
 829                                            struct tipc_nl_compat_msg *msg)
 830 {
 831         char *name;
 832         struct nlattr *link;
 833         int len;
 834
 835         name = (char *)TLV_DATA(msg->req);
 836
 837         link = nla_nest_start_noflag(skb, TIPC_NLA_LINK);
 838         if (!link)
 839                 return -EMSGSIZE;
 840
 841         len = TLV_GET_DATA_LEN(msg->req);
 842         if (len <= 0)
 843                 return -EINVAL;
 844
 845         len = min_t(int, len, TIPC_MAX_LINK_NAME);
 846         if (!string_is_valid(name, len))
 847                 return -EINVAL;
 848
 849         if (nla_put_string(skb, TIPC_NLA_LINK_NAME, name))
 850                 return -EMSGSIZE;
 851
 852         nla_nest_end(skb, link);
 853
 854         return 0;
 855 }
 856
 857 static int tipc_nl_compat_name_table_dump_header(struct tipc_nl_compat_msg *msg)
 858 {
 859         int i;
 860         u32 depth;
 861         struct tipc_name_table_query *ntq;
 862         static const char * const header[] = {
 863                 "Type       ",
 864                 "Lower      Upper      ",
 865                 "Port Identity              ",
 866                 "Publication Scope"
 867         };
 868
 869         ntq = (struct tipc_name_table_query *)TLV_DATA(msg->req);
 870         if (TLV_GET_DATA_LEN(msg->req) < sizeof(struct tipc_name_table_query))
 871                 return -EINVAL;
 872
 873         depth = ntohl(ntq->depth);
 874
 875         if (depth > 4)
 876                 depth = 4;
 877         for (i = 0; i < depth; i++)
 878                 tipc_tlv_sprintf(msg->rep, header[i]);
 879         tipc_tlv_sprintf(msg->rep, "\n");
 880
 881         return 0;
 882 }
 883
 884 static int tipc_nl_compat_name_table_dump(struct tipc_nl_compat_msg *msg,
 885                                           struct nlattr **attrs)
 886 {
 887         char port_str[27];
 888         struct tipc_name_table_query *ntq;
 889         struct nlattr *nt[TIPC_NLA_NAME_TABLE_MAX + 1];
 890         struct nlattr *publ[TIPC_NLA_PUBL_MAX + 1];
 891         u32 node, depth, type, lowbound, upbound;
 892         static const char * const scope_str[] = {"", " zone", " cluster",
 893                                                  " node"};
 894         int err;
 895
 896         if (!attrs[TIPC_NLA_NAME_TABLE])
 897                 return -EINVAL;
 898
 899         err = nla_parse_nested_deprecated(nt, TIPC_NLA_NAME_TABLE_MAX,
 900                                           attrs[TIPC_NLA_NAME_TABLE], NULL,
 901                                           NULL);
 902         if (err)
 903                 return err;
 904
 905         if (!nt[TIPC_NLA_NAME_TABLE_PUBL])
 906                 return -EINVAL;
 907
 908         err = nla_parse_nested_deprecated(publ, TIPC_NLA_PUBL_MAX,
 909                                           nt[TIPC_NLA_NAME_TABLE_PUBL], NULL,
 910                                           NULL);
 911         if (err)
 912                 return err;
 913
 914         ntq = (struct tipc_name_table_query *)TLV_DATA(msg->req);
 915
 916         depth = ntohl(ntq->depth);
 917         type = ntohl(ntq->type);
 918         lowbound = ntohl(ntq->lowbound);
 919         upbound = ntohl(ntq->upbound);
 920
 921         if (!(depth & TIPC_NTQ_ALLTYPES) &&
 922             (type != nla_get_u32(publ[TIPC_NLA_PUBL_TYPE])))
 923                 return 0;
 924         if (lowbound && (lowbound > nla_get_u32(publ[TIPC_NLA_PUBL_UPPER])))
 925                 return 0;
 926         if (upbound && (upbound < nla_get_u32(publ[TIPC_NLA_PUBL_LOWER])))
 927                 return 0;
 928
 929         tipc_tlv_sprintf(msg->rep, "%-10u ",
 930                          nla_get_u32(publ[TIPC_NLA_PUBL_TYPE]));
 931
 932         if (depth == 1)
 933                 goto out;
 934
 935         tipc_tlv_sprintf(msg->rep, "%-10u %-10u ",
 936                          nla_get_u32(publ[TIPC_NLA_PUBL_LOWER]),
 937                          nla_get_u32(publ[TIPC_NLA_PUBL_UPPER]));
 938
 939         if (depth == 2)
 940                 goto out;
 941
 942         node = nla_get_u32(publ[TIPC_NLA_PUBL_NODE]);
 943         sprintf(port_str, "<%u.%u.%u:%u>", tipc_zone(node), tipc_cluster(node),
 944                 tipc_node(node), nla_get_u32(publ[TIPC_NLA_PUBL_REF]));
 945         tipc_tlv_sprintf(msg->rep, "%-26s ", port_str);
 946
 947         if (depth == 3)
 948                 goto out;
 949
 950         tipc_tlv_sprintf(msg->rep, "%-10u %s",
 951                          nla_get_u32(publ[TIPC_NLA_PUBL_KEY]),
 952                          scope_str[nla_get_u32(publ[TIPC_NLA_PUBL_SCOPE])]);
 953 out:
 954         tipc_tlv_sprintf(msg->rep, "\n");
 955
 956         return 0;
 957 }
 958
 959 static int __tipc_nl_compat_publ_dump(struct tipc_nl_compat_msg *msg,
 960                                       struct nlattr **attrs)
 961 {
 962         u32 type, lower, upper;
 963         struct nlattr *publ[TIPC_NLA_PUBL_MAX + 1];
 964         int err;
 965
 966         if (!attrs[TIPC_NLA_PUBL])
 967                 return -EINVAL;
 968
 969         err = nla_parse_nested_deprecated(publ, TIPC_NLA_PUBL_MAX,
 970                                           attrs[TIPC_NLA_PUBL], NULL, NULL);
 971         if (err)
 972                 return err;
 973
 974         type = nla_get_u32(publ[TIPC_NLA_PUBL_TYPE]);
 975         lower = nla_get_u32(publ[TIPC_NLA_PUBL_LOWER]);
 976         upper = nla_get_u32(publ[TIPC_NLA_PUBL_UPPER]);
 977
 978         if (lower == upper)
 979                 tipc_tlv_sprintf(msg->rep, " {%u,%u}", type, lower);
 980         else
 981                 tipc_tlv_sprintf(msg->rep, " {%u,%u,%u}", type, lower, upper);
 982
 983         return 0;
 984 }
 985
 986 static int tipc_nl_compat_publ_dump(struct tipc_nl_compat_msg *msg, u32 sock)
 987 {
 988         int err;
 989         void *hdr;
 990         struct nlattr *nest;
 991         struct sk_buff *args;
 992         struct tipc_nl_compat_cmd_dump dump;
 993
 994         args = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 995         if (!args)
 996                 return -ENOMEM;
 997
 998         hdr = genlmsg_put(args, 0, 0, &tipc_genl_family, NLM_F_MULTI,
 999                           TIPC_NL_PUBL_GET);
1000         if (!hdr) {
1001                 kfree_skb(args);
1002                 return -EMSGSIZE;
1003         }
1004
1005         nest = nla_nest_start_noflag(args, TIPC_NLA_SOCK);
1006         if (!nest) {
1007                 kfree_skb(args);
1008                 return -EMSGSIZE;
1009         }
1010
1011         if (nla_put_u32(args, TIPC_NLA_SOCK_REF, sock)) {
1012                 kfree_skb(args);
1013                 return -EMSGSIZE;
1014         }
1015
1016         nla_nest_end(args, nest);
1017         genlmsg_end(args, hdr);
1018
1019         dump.dumpit = tipc_nl_publ_dump;
1020         dump.format = __tipc_nl_compat_publ_dump;
1021
1022         err = __tipc_nl_compat_dumpit(&dump, msg, args);
1023
1024         kfree_skb(args);
1025
1026         return err;
1027 }
1028
1029 static int tipc_nl_compat_sk_dump(struct tipc_nl_compat_msg *msg,
1030                                   struct nlattr **attrs)
1031 {
1032         int err;
1033         u32 sock_ref;
1034         struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
1035
1036         if (!attrs[TIPC_NLA_SOCK])
1037                 return -EINVAL;
1038
1039         err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX,
1040                                           attrs[TIPC_NLA_SOCK], NULL, NULL);
1041         if (err)
1042                 return err;
1043
1044         sock_ref = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
1045         tipc_tlv_sprintf(msg->rep, "%u:", sock_ref);
1046
1047         if (sock[TIPC_NLA_SOCK_CON]) {
1048                 u32 node;
1049                 struct nlattr *con[TIPC_NLA_CON_MAX + 1];
1050
1051                 err = nla_parse_nested_deprecated(con, TIPC_NLA_CON_MAX,
1052                                                   sock[TIPC_NLA_SOCK_CON],
1053                                                   NULL, NULL);
1054
1055                 if (err)
1056                         return err;
1057
1058                 node = nla_get_u32(con[TIPC_NLA_CON_NODE]);
1059                 tipc_tlv_sprintf(msg->rep, "  connected to <%u.%u.%u:%u>",
1060                                  tipc_zone(node),
1061                                  tipc_cluster(node),
1062                                  tipc_node(node),
1063                                  nla_get_u32(con[TIPC_NLA_CON_SOCK]));
1064
1065                 if (con[TIPC_NLA_CON_FLAG])
1066                         tipc_tlv_sprintf(msg->rep, " via {%u,%u}\n",
1067                                          nla_get_u32(con[TIPC_NLA_CON_TYPE]),
1068                                          nla_get_u32(con[TIPC_NLA_CON_INST]));
1069                 else
1070                         tipc_tlv_sprintf(msg->rep, "\n");
1071         } else if (sock[TIPC_NLA_SOCK_HAS_PUBL]) {
1072                 tipc_tlv_sprintf(msg->rep, " bound to");
1073
1074                 err = tipc_nl_compat_publ_dump(msg, sock_ref);
1075                 if (err)
1076                         return err;
1077         }
1078         tipc_tlv_sprintf(msg->rep, "\n");
1079
1080         return 0;
1081 }
1082
1083 static int tipc_nl_compat_media_dump(struct tipc_nl_compat_msg *msg,
1084                                      struct nlattr **attrs)
1085 {
1086         struct nlattr *media[TIPC_NLA_MEDIA_MAX + 1];
1087         int err;
1088
1089         if (!attrs[TIPC_NLA_MEDIA])
1090                 return -EINVAL;
1091
1092         err = nla_parse_nested_deprecated(media, TIPC_NLA_MEDIA_MAX,
1093                                           attrs[TIPC_NLA_MEDIA], NULL, NULL);
1094         if (err)
1095                 return err;
1096
1097         return tipc_add_tlv(msg->rep, TIPC_TLV_MEDIA_NAME,
1098                             nla_data(media[TIPC_NLA_MEDIA_NAME]),
1099                             nla_len(media[TIPC_NLA_MEDIA_NAME]));
1100 }
1101
1102 static int tipc_nl_compat_node_dump(struct tipc_nl_compat_msg *msg,
1103                                     struct nlattr **attrs)
1104 {
1105         struct tipc_node_info node_info;
1106         struct nlattr *node[TIPC_NLA_NODE_MAX + 1];
1107         int err;
1108
1109         if (!attrs[TIPC_NLA_NODE])
1110                 return -EINVAL;
1111
1112         err = nla_parse_nested_deprecated(node, TIPC_NLA_NODE_MAX,
1113                                           attrs[TIPC_NLA_NODE], NULL, NULL);
1114         if (err)
1115                 return err;
1116
1117         node_info.addr = htonl(nla_get_u32(node[TIPC_NLA_NODE_ADDR]));
1118         node_info.up = htonl(nla_get_flag(node[TIPC_NLA_NODE_UP]));
1119
1120         return tipc_add_tlv(msg->rep, TIPC_TLV_NODE_INFO, &node_info,
1121                             sizeof(node_info));
1122 }
1123
1124 static int tipc_nl_compat_net_set(struct tipc_nl_compat_cmd_doit *cmd,
1125                                   struct sk_buff *skb,
1126                                   struct tipc_nl_compat_msg *msg)
1127 {
1128         u32 val;
1129         struct nlattr *net;
1130
1131         val = ntohl(*(__be32 *)TLV_DATA(msg->req));
1132
1133         net = nla_nest_start_noflag(skb, TIPC_NLA_NET);
1134         if (!net)
1135                 return -EMSGSIZE;
1136
1137         if (msg->cmd == TIPC_CMD_SET_NODE_ADDR) {
1138                 if (nla_put_u32(skb, TIPC_NLA_NET_ADDR, val))
1139                         return -EMSGSIZE;
1140         } else if (msg->cmd == TIPC_CMD_SET_NETID) {
1141                 if (nla_put_u32(skb, TIPC_NLA_NET_ID, val))
1142                         return -EMSGSIZE;
1143         }
1144         nla_nest_end(skb, net);
1145
1146         return 0;
1147 }
1148
1149 static int tipc_nl_compat_net_dump(struct tipc_nl_compat_msg *msg,
1150                                    struct nlattr **attrs)
1151 {
1152         __be32 id;
1153         struct nlattr *net[TIPC_NLA_NET_MAX + 1];
1154         int err;
1155
1156         if (!attrs[TIPC_NLA_NET])
1157                 return -EINVAL;
1158
1159         err = nla_parse_nested_deprecated(net, TIPC_NLA_NET_MAX,
1160                                           attrs[TIPC_NLA_NET], NULL, NULL);
1161         if (err)
1162                 return err;
1163
1164         id = htonl(nla_get_u32(net[TIPC_NLA_NET_ID]));
1165
1166         return tipc_add_tlv(msg->rep, TIPC_TLV_UNSIGNED, &id, sizeof(id));
1167 }
1168
1169 static int tipc_cmd_show_stats_compat(struct tipc_nl_compat_msg *msg)
1170 {
1171         msg->rep = tipc_tlv_alloc(ULTRA_STRING_MAX_LEN);
1172         if (!msg->rep)
1173                 return -ENOMEM;
1174
1175         tipc_tlv_init(msg->rep, TIPC_TLV_ULTRA_STRING);
1176         tipc_tlv_sprintf(msg->rep, "TIPC version " TIPC_MOD_VER "\n");
1177
1178         return 0;
1179 }
1180
1181 static int tipc_nl_compat_handle(struct tipc_nl_compat_msg *msg)
1182 {
1183         struct tipc_nl_compat_cmd_dump dump;
1184         struct tipc_nl_compat_cmd_doit doit;
1185
1186         memset(&dump, 0, sizeof(dump));
1187         memset(&doit, 0, sizeof(doit));
1188
1189         switch (msg->cmd) {
1190         case TIPC_CMD_NOOP:
1191                 msg->rep = tipc_tlv_alloc(0);
1192                 if (!msg->rep)
1193                         return -ENOMEM;
1194                 return 0;
1195         case TIPC_CMD_GET_BEARER_NAMES:
1196                 msg->rep_size = MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME);
1197                 dump.dumpit = tipc_nl_bearer_dump;
1198                 dump.format = tipc_nl_compat_bearer_dump;
1199                 return tipc_nl_compat_dumpit(&dump, msg);
1200         case TIPC_CMD_ENABLE_BEARER:
1201                 msg->req_type = TIPC_TLV_BEARER_CONFIG;
1202                 doit.doit = __tipc_nl_bearer_enable;
1203                 doit.transcode = tipc_nl_compat_bearer_enable;
1204                 return tipc_nl_compat_doit(&doit, msg);
1205         case TIPC_CMD_DISABLE_BEARER:
1206                 msg->req_type = TIPC_TLV_BEARER_NAME;
1207                 doit.doit = __tipc_nl_bearer_disable;
1208                 doit.transcode = tipc_nl_compat_bearer_disable;
1209                 return tipc_nl_compat_doit(&doit, msg);
1210         case TIPC_CMD_SHOW_LINK_STATS:
1211                 msg->req_type = TIPC_TLV_LINK_NAME;
1212                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1213                 msg->rep_type = TIPC_TLV_ULTRA_STRING;
1214                 dump.dumpit = tipc_nl_node_dump_link;
1215                 dump.format = tipc_nl_compat_link_stat_dump;
1216                 return tipc_nl_compat_dumpit(&dump, msg);
1217         case TIPC_CMD_GET_LINKS:
1218                 msg->req_type = TIPC_TLV_NET_ADDR;
1219                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1220                 dump.dumpit = tipc_nl_node_dump_link;
1221                 dump.format = tipc_nl_compat_link_dump;
1222                 return tipc_nl_compat_dumpit(&dump, msg);
1223         case TIPC_CMD_SET_LINK_TOL:
1224         case TIPC_CMD_SET_LINK_PRI:
1225         case TIPC_CMD_SET_LINK_WINDOW:
1226                 msg->req_type =  TIPC_TLV_LINK_CONFIG;
1227                 doit.doit = tipc_nl_node_set_link;
1228                 doit.transcode = tipc_nl_compat_link_set;
1229                 return tipc_nl_compat_doit(&doit, msg);
1230         case TIPC_CMD_RESET_LINK_STATS:
1231                 msg->req_type = TIPC_TLV_LINK_NAME;
1232                 doit.doit = tipc_nl_node_reset_link_stats;
1233                 doit.transcode = tipc_nl_compat_link_reset_stats;
1234                 return tipc_nl_compat_doit(&doit, msg);
1235         case TIPC_CMD_SHOW_NAME_TABLE:
1236                 msg->req_type = TIPC_TLV_NAME_TBL_QUERY;
1237                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1238                 msg->rep_type = TIPC_TLV_ULTRA_STRING;
1239                 dump.header = tipc_nl_compat_name_table_dump_header;
1240                 dump.dumpit = tipc_nl_name_table_dump;
1241                 dump.format = tipc_nl_compat_name_table_dump;
1242                 return tipc_nl_compat_dumpit(&dump, msg);
1243         case TIPC_CMD_SHOW_PORTS:
1244                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1245                 msg->rep_type = TIPC_TLV_ULTRA_STRING;
1246                 dump.dumpit = tipc_nl_sk_dump;
1247                 dump.format = tipc_nl_compat_sk_dump;
1248                 return tipc_nl_compat_dumpit(&dump, msg);
1249         case TIPC_CMD_GET_MEDIA_NAMES:
1250                 msg->rep_size = MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME);
1251                 dump.dumpit = tipc_nl_media_dump;
1252                 dump.format = tipc_nl_compat_media_dump;
1253                 return tipc_nl_compat_dumpit(&dump, msg);
1254         case TIPC_CMD_GET_NODES:
1255                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1256                 dump.dumpit = tipc_nl_node_dump;
1257                 dump.format = tipc_nl_compat_node_dump;
1258                 return tipc_nl_compat_dumpit(&dump, msg);
1259         case TIPC_CMD_SET_NODE_ADDR:
1260                 msg->req_type = TIPC_TLV_NET_ADDR;
1261                 doit.doit = __tipc_nl_net_set;
1262                 doit.transcode = tipc_nl_compat_net_set;
1263                 return tipc_nl_compat_doit(&doit, msg);
1264         case TIPC_CMD_SET_NETID:
1265                 msg->req_type = TIPC_TLV_UNSIGNED;
1266                 doit.doit = __tipc_nl_net_set;
1267                 doit.transcode = tipc_nl_compat_net_set;
1268                 return tipc_nl_compat_doit(&doit, msg);
1269         case TIPC_CMD_GET_NETID:
1270                 msg->rep_size = sizeof(u32);
1271                 dump.dumpit = tipc_nl_net_dump;
1272                 dump.format = tipc_nl_compat_net_dump;
1273                 return tipc_nl_compat_dumpit(&dump, msg);
1274         case TIPC_CMD_SHOW_STATS:
1275                 return tipc_cmd_show_stats_compat(msg);
1276         }
1277
1278         return -EOPNOTSUPP;
1279 }
1280
1281 static int tipc_nl_compat_recv(struct sk_buff *skb, struct genl_info *info)
1282 {
1283         int err;
1284         int len;
1285         struct tipc_nl_compat_msg msg;
1286         struct nlmsghdr *req_nlh;
1287         struct nlmsghdr *rep_nlh;
1288         struct tipc_genlmsghdr *req_userhdr = info->userhdr;
1289
1290         memset(&msg, 0, sizeof(msg));
1291
1292         req_nlh = (struct nlmsghdr *)skb->data;
1293         msg.req = nlmsg_data(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN;
1294         msg.cmd = req_userhdr->cmd;
1295         msg.net = genl_info_net(info);
1296         msg.dst_sk = skb->sk;
1297
1298         if ((msg.cmd & 0xC000) && (!netlink_net_capable(skb, CAP_NET_ADMIN))) {
1299                 msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_NET_ADMIN);
1300                 err = -EACCES;
1301                 goto send;
1302         }
1303
1304         msg.req_size = nlmsg_attrlen(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN);
1305         if (msg.req_size && !TLV_OK(msg.req, msg.req_size)) {
1306                 msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED);
1307                 err = -EOPNOTSUPP;
1308                 goto send;
1309         }
1310
1311         err = tipc_nl_compat_handle(&msg);
1312         if ((err == -EOPNOTSUPP) || (err == -EPERM))
1313                 msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED);
1314         else if (err == -EINVAL)
1315                 msg.rep = tipc_get_err_tlv(TIPC_CFG_TLV_ERROR);
1316 send:
1317         if (!msg.rep)
1318                 return err;
1319
1320         len = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN);
1321         skb_push(msg.rep, len);
1322         rep_nlh = nlmsg_hdr(msg.rep);
1323         memcpy(rep_nlh, info->nlhdr, len);
1324         rep_nlh->nlmsg_len = msg.rep->len;
1325         genlmsg_unicast(msg.net, msg.rep, NETLINK_CB(skb).portid);
1326
1327         return err;
1328 }
1329
1330 static const struct genl_ops tipc_genl_compat_ops[] = {
1331         {
1332                 .cmd            = TIPC_GENL_CMD,
1333                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1334                 .doit           = tipc_nl_compat_recv,
1335         },
1336 };
1337
1338 static struct genl_family tipc_genl_compat_family __ro_after_init = {
1339         .name           = TIPC_GENL_NAME,
1340         .version        = TIPC_GENL_VERSION,
1341         .hdrsize        = TIPC_GENL_HDRLEN,
1342         .maxattr        = 0,
1343         .netnsok        = true,
1344         .module         = THIS_MODULE,
1345         .ops            = tipc_genl_compat_ops,
1346         .n_ops          = ARRAY_SIZE(tipc_genl_compat_ops),
1347 };
1348
1349 int __init tipc_netlink_compat_start(void)
1350 {
1351         int res;
1352
1353         res = genl_register_family(&tipc_genl_compat_family);
1354         if (res) {
1355                 pr_err("Failed to register legacy compat interface\n");
1356                 return res;
1357         }
1358
1359         return 0;
1360 }
1361
1362 void tipc_netlink_compat_stop(void)
1363 {
1364         genl_unregister_family(&tipc_genl_compat_family);
1365 }