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         struct nlmsghdr *nlh;
 279         struct sk_buff *arg;
 280         int err;
 281
 282         if (msg->req_type && (!msg->req_size ||
 283                               !TLV_CHECK_TYPE(msg->req, msg->req_type)))
 284                 return -EINVAL;
 285
 286         msg->rep = tipc_tlv_alloc(msg->rep_size);
 287         if (!msg->rep)
 288                 return -ENOMEM;
 289
 290         if (msg->rep_type)
 291                 tipc_tlv_init(msg->rep, msg->rep_type);
 292
 293         if (cmd->header) {
 294                 err = (*cmd->header)(msg);
 295                 if (err) {
 296                         kfree_skb(msg->rep);
 297                         msg->rep = NULL;
 298                         return err;
 299                 }
 300         }
 301
 302         arg = nlmsg_new(0, GFP_KERNEL);
 303         if (!arg) {
 304                 kfree_skb(msg->rep);
 305                 msg->rep = NULL;
 306                 return -ENOMEM;
 307         }
 308
 309         nlh = nlmsg_put(arg, 0, 0, tipc_genl_family.id, 0, NLM_F_MULTI);
 310         if (!nlh) {
 311                 kfree_skb(arg);
 312                 kfree_skb(msg->rep);
 313                 msg->rep = NULL;
 314                 return -EMSGSIZE;
 315         }
 316         nlmsg_end(arg, nlh);
 317
 318         err = __tipc_nl_compat_dumpit(cmd, msg, arg);
 319         if (err) {
 320                 kfree_skb(msg->rep);
 321                 msg->rep = NULL;
 322         }
 323         kfree_skb(arg);
 324
 325         return err;
 326 }
 327
 328 static int __tipc_nl_compat_doit(struct tipc_nl_compat_cmd_doit *cmd,
 329                                  struct tipc_nl_compat_msg *msg)
 330 {
 331         int err;
 332         struct sk_buff *doit_buf;
 333         struct sk_buff *trans_buf;
 334         struct nlattr **attrbuf;
 335         struct genl_info info;
 336
 337         trans_buf = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 338         if (!trans_buf)
 339                 return -ENOMEM;
 340
 341         attrbuf = kmalloc_array(tipc_genl_family.maxattr + 1,
 342                                 sizeof(struct nlattr *),
 343                                 GFP_KERNEL);
 344         if (!attrbuf) {
 345                 err = -ENOMEM;
 346                 goto trans_out;
 347         }
 348
 349         doit_buf = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 350         if (!doit_buf) {
 351                 err = -ENOMEM;
 352                 goto attrbuf_out;
 353         }
 354
 355         memset(&info, 0, sizeof(info));
 356         info.attrs = attrbuf;
 357
 358         rtnl_lock();
 359         err = (*cmd->transcode)(cmd, trans_buf, msg);
 360         if (err)
 361                 goto doit_out;
 362
 363         err = nla_parse_deprecated(attrbuf, tipc_genl_family.maxattr,
 364                                    (const struct nlattr *)trans_buf->data,
 365                                    trans_buf->len, NULL, NULL);
 366         if (err)
 367                 goto doit_out;
 368
 369         doit_buf->sk = msg->dst_sk;
 370
 371         err = (*cmd->doit)(doit_buf, &info);
 372 doit_out:
 373         rtnl_unlock();
 374
 375         kfree_skb(doit_buf);
 376 attrbuf_out:
 377         kfree(attrbuf);
 378 trans_out:
 379         kfree_skb(trans_buf);
 380
 381         return err;
 382 }
 383
 384 static int tipc_nl_compat_doit(struct tipc_nl_compat_cmd_doit *cmd,
 385                                struct tipc_nl_compat_msg *msg)
 386 {
 387         int err;
 388
 389         if (msg->req_type && (!msg->req_size ||
 390                               !TLV_CHECK_TYPE(msg->req, msg->req_type)))
 391                 return -EINVAL;
 392
 393         err = __tipc_nl_compat_doit(cmd, msg);
 394         if (err)
 395                 return err;
 396
 397         /* The legacy API considered an empty message a success message */
 398         msg->rep = tipc_tlv_alloc(0);
 399         if (!msg->rep)
 400                 return -ENOMEM;
 401
 402         return 0;
 403 }
 404
 405 static int tipc_nl_compat_bearer_dump(struct tipc_nl_compat_msg *msg,
 406                                       struct nlattr **attrs)
 407 {
 408         struct nlattr *bearer[TIPC_NLA_BEARER_MAX + 1];
 409         int err;
 410
 411         if (!attrs[TIPC_NLA_BEARER])
 412                 return -EINVAL;
 413
 414         err = nla_parse_nested_deprecated(bearer, TIPC_NLA_BEARER_MAX,
 415                                           attrs[TIPC_NLA_BEARER], NULL, NULL);
 416         if (err)
 417                 return err;
 418
 419         return tipc_add_tlv(msg->rep, TIPC_TLV_BEARER_NAME,
 420                             nla_data(bearer[TIPC_NLA_BEARER_NAME]),
 421                             nla_len(bearer[TIPC_NLA_BEARER_NAME]));
 422 }
 423
 424 static int tipc_nl_compat_bearer_enable(struct tipc_nl_compat_cmd_doit *cmd,
 425                                         struct sk_buff *skb,
 426                                         struct tipc_nl_compat_msg *msg)
 427 {
 428         struct nlattr *prop;
 429         struct nlattr *bearer;
 430         struct tipc_bearer_config *b;
 431         int len;
 432
 433         b = (struct tipc_bearer_config *)TLV_DATA(msg->req);
 434
 435         bearer = nla_nest_start_noflag(skb, TIPC_NLA_BEARER);
 436         if (!bearer)
 437                 return -EMSGSIZE;
 438
 439         len = TLV_GET_DATA_LEN(msg->req);
 440         len -= offsetof(struct tipc_bearer_config, name);
 441         if (len <= 0)
 442                 return -EINVAL;
 443
 444         len = min_t(int, len, TIPC_MAX_BEARER_NAME);
 445         if (!string_is_valid(b->name, len))
 446                 return -EINVAL;
 447
 448         if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, b->name))
 449                 return -EMSGSIZE;
 450
 451         if (nla_put_u32(skb, TIPC_NLA_BEARER_DOMAIN, ntohl(b->disc_domain)))
 452                 return -EMSGSIZE;
 453
 454         if (ntohl(b->priority) <= TIPC_MAX_LINK_PRI) {
 455                 prop = nla_nest_start_noflag(skb, TIPC_NLA_BEARER_PROP);
 456                 if (!prop)
 457                         return -EMSGSIZE;
 458                 if (nla_put_u32(skb, TIPC_NLA_PROP_PRIO, ntohl(b->priority)))
 459                         return -EMSGSIZE;
 460                 nla_nest_end(skb, prop);
 461         }
 462         nla_nest_end(skb, bearer);
 463
 464         return 0;
 465 }
 466
 467 static int tipc_nl_compat_bearer_disable(struct tipc_nl_compat_cmd_doit *cmd,
 468                                          struct sk_buff *skb,
 469                                          struct tipc_nl_compat_msg *msg)
 470 {
 471         char *name;
 472         struct nlattr *bearer;
 473         int len;
 474
 475         name = (char *)TLV_DATA(msg->req);
 476
 477         bearer = nla_nest_start_noflag(skb, TIPC_NLA_BEARER);
 478         if (!bearer)
 479                 return -EMSGSIZE;
 480
 481         len = TLV_GET_DATA_LEN(msg->req);
 482         if (len <= 0)
 483                 return -EINVAL;
 484
 485         len = min_t(int, len, TIPC_MAX_BEARER_NAME);
 486         if (!string_is_valid(name, len))
 487                 return -EINVAL;
 488
 489         if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, name))
 490                 return -EMSGSIZE;
 491
 492         nla_nest_end(skb, bearer);
 493
 494         return 0;
 495 }
 496
 497 static inline u32 perc(u32 count, u32 total)
 498 {
 499         return (count * 100 + (total / 2)) / total;
 500 }
 501
 502 static void __fill_bc_link_stat(struct tipc_nl_compat_msg *msg,
 503                                 struct nlattr *prop[], struct nlattr *stats[])
 504 {
 505         tipc_tlv_sprintf(msg->rep, "  Window:%u packets\n",
 506                          nla_get_u32(prop[TIPC_NLA_PROP_WIN]));
 507
 508         tipc_tlv_sprintf(msg->rep,
 509                          "  RX packets:%u fragments:%u/%u bundles:%u/%u\n",
 510                          nla_get_u32(stats[TIPC_NLA_STATS_RX_INFO]),
 511                          nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTS]),
 512                          nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTED]),
 513                          nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLES]),
 514                          nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLED]));
 515
 516         tipc_tlv_sprintf(msg->rep,
 517                          "  TX packets:%u fragments:%u/%u bundles:%u/%u\n",
 518                          nla_get_u32(stats[TIPC_NLA_STATS_TX_INFO]),
 519                          nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTS]),
 520                          nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTED]),
 521                          nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLES]),
 522                          nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLED]));
 523
 524         tipc_tlv_sprintf(msg->rep, "  RX naks:%u defs:%u dups:%u\n",
 525                          nla_get_u32(stats[TIPC_NLA_STATS_RX_NACKS]),
 526                          nla_get_u32(stats[TIPC_NLA_STATS_RX_DEFERRED]),
 527                          nla_get_u32(stats[TIPC_NLA_STATS_DUPLICATES]));
 528
 529         tipc_tlv_sprintf(msg->rep, "  TX naks:%u acks:%u dups:%u\n",
 530                          nla_get_u32(stats[TIPC_NLA_STATS_TX_NACKS]),
 531                          nla_get_u32(stats[TIPC_NLA_STATS_TX_ACKS]),
 532                          nla_get_u32(stats[TIPC_NLA_STATS_RETRANSMITTED]));
 533
 534         tipc_tlv_sprintf(msg->rep,
 535                          "  Congestion link:%u  Send queue max:%u avg:%u",
 536                          nla_get_u32(stats[TIPC_NLA_STATS_LINK_CONGS]),
 537                          nla_get_u32(stats[TIPC_NLA_STATS_MAX_QUEUE]),
 538                          nla_get_u32(stats[TIPC_NLA_STATS_AVG_QUEUE]));
 539 }
 540
 541 static int tipc_nl_compat_link_stat_dump(struct tipc_nl_compat_msg *msg,
 542                                          struct nlattr **attrs)
 543 {
 544         char *name;
 545         struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
 546         struct nlattr *prop[TIPC_NLA_PROP_MAX + 1];
 547         struct nlattr *stats[TIPC_NLA_STATS_MAX + 1];
 548         int err;
 549         int len;
 550
 551         if (!attrs[TIPC_NLA_LINK])
 552                 return -EINVAL;
 553
 554         err = nla_parse_nested_deprecated(link, TIPC_NLA_LINK_MAX,
 555                                           attrs[TIPC_NLA_LINK], NULL, NULL);
 556         if (err)
 557                 return err;
 558
 559         if (!link[TIPC_NLA_LINK_PROP])
 560                 return -EINVAL;
 561
 562         err = nla_parse_nested_deprecated(prop, TIPC_NLA_PROP_MAX,
 563                                           link[TIPC_NLA_LINK_PROP], NULL,
 564                                           NULL);
 565         if (err)
 566                 return err;
 567
 568         if (!link[TIPC_NLA_LINK_STATS])
 569                 return -EINVAL;
 570
 571         err = nla_parse_nested_deprecated(stats, TIPC_NLA_STATS_MAX,
 572                                           link[TIPC_NLA_LINK_STATS], NULL,
 573                                           NULL);
 574         if (err)
 575                 return err;
 576
 577         name = (char *)TLV_DATA(msg->req);
 578
 579         len = TLV_GET_DATA_LEN(msg->req);
 580         if (len <= 0)
 581                 return -EINVAL;
 582
 583         len = min_t(int, len, TIPC_MAX_LINK_NAME);
 584         if (!string_is_valid(name, len))
 585                 return -EINVAL;
 586
 587         if (strcmp(name, nla_data(link[TIPC_NLA_LINK_NAME])) != 0)
 588                 return 0;
 589
 590         tipc_tlv_sprintf(msg->rep, "\nLink <%s>\n",
 591                          nla_data(link[TIPC_NLA_LINK_NAME]));
 592
 593         if (link[TIPC_NLA_LINK_BROADCAST]) {
 594                 __fill_bc_link_stat(msg, prop, stats);
 595                 return 0;
 596         }
 597
 598         if (link[TIPC_NLA_LINK_ACTIVE])
 599                 tipc_tlv_sprintf(msg->rep, "  ACTIVE");
 600         else if (link[TIPC_NLA_LINK_UP])
 601                 tipc_tlv_sprintf(msg->rep, "  STANDBY");
 602         else
 603                 tipc_tlv_sprintf(msg->rep, "  DEFUNCT");
 604
 605         tipc_tlv_sprintf(msg->rep, "  MTU:%u  Priority:%u",
 606                          nla_get_u32(link[TIPC_NLA_LINK_MTU]),
 607                          nla_get_u32(prop[TIPC_NLA_PROP_PRIO]));
 608
 609         tipc_tlv_sprintf(msg->rep, "  Tolerance:%u ms  Window:%u packets\n",
 610                          nla_get_u32(prop[TIPC_NLA_PROP_TOL]),
 611                          nla_get_u32(prop[TIPC_NLA_PROP_WIN]));
 612
 613         tipc_tlv_sprintf(msg->rep,
 614                          "  RX packets:%u fragments:%u/%u bundles:%u/%u\n",
 615                          nla_get_u32(link[TIPC_NLA_LINK_RX]) -
 616                          nla_get_u32(stats[TIPC_NLA_STATS_RX_INFO]),
 617                          nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTS]),
 618                          nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTED]),
 619                          nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLES]),
 620                          nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLED]));
 621
 622         tipc_tlv_sprintf(msg->rep,
 623                          "  TX packets:%u fragments:%u/%u bundles:%u/%u\n",
 624                          nla_get_u32(link[TIPC_NLA_LINK_TX]) -
 625                          nla_get_u32(stats[TIPC_NLA_STATS_TX_INFO]),
 626                          nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTS]),
 627                          nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTED]),
 628                          nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLES]),
 629                          nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLED]));
 630
 631         tipc_tlv_sprintf(msg->rep,
 632                          "  TX profile sample:%u packets  average:%u octets\n",
 633                          nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_CNT]),
 634                          nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_TOT]) /
 635                          nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT]));
 636
 637         tipc_tlv_sprintf(msg->rep,
 638                          "  0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% ",
 639                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P0]),
 640                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 641                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P1]),
 642                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 643                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P2]),
 644                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 645                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P3]),
 646                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])));
 647
 648         tipc_tlv_sprintf(msg->rep, "-16384:%u%% -32768:%u%% -66000:%u%%\n",
 649                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P4]),
 650                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 651                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P5]),
 652                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 653                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P6]),
 654                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])));
 655
 656         tipc_tlv_sprintf(msg->rep,
 657                          "  RX states:%u probes:%u naks:%u defs:%u dups:%u\n",
 658                          nla_get_u32(stats[TIPC_NLA_STATS_RX_STATES]),
 659                          nla_get_u32(stats[TIPC_NLA_STATS_RX_PROBES]),
 660                          nla_get_u32(stats[TIPC_NLA_STATS_RX_NACKS]),
 661                          nla_get_u32(stats[TIPC_NLA_STATS_RX_DEFERRED]),
 662                          nla_get_u32(stats[TIPC_NLA_STATS_DUPLICATES]));
 663
 664         tipc_tlv_sprintf(msg->rep,
 665                          "  TX states:%u probes:%u naks:%u acks:%u dups:%u\n",
 666                          nla_get_u32(stats[TIPC_NLA_STATS_TX_STATES]),
 667                          nla_get_u32(stats[TIPC_NLA_STATS_TX_PROBES]),
 668                          nla_get_u32(stats[TIPC_NLA_STATS_TX_NACKS]),
 669                          nla_get_u32(stats[TIPC_NLA_STATS_TX_ACKS]),
 670                          nla_get_u32(stats[TIPC_NLA_STATS_RETRANSMITTED]));
 671
 672         tipc_tlv_sprintf(msg->rep,
 673                          "  Congestion link:%u  Send queue max:%u avg:%u",
 674                          nla_get_u32(stats[TIPC_NLA_STATS_LINK_CONGS]),
 675                          nla_get_u32(stats[TIPC_NLA_STATS_MAX_QUEUE]),
 676                          nla_get_u32(stats[TIPC_NLA_STATS_AVG_QUEUE]));
 677
 678         return 0;
 679 }
 680
 681 static int tipc_nl_compat_link_dump(struct tipc_nl_compat_msg *msg,
 682                                     struct nlattr **attrs)
 683 {
 684         struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
 685         struct tipc_link_info link_info;
 686         int err;
 687
 688         if (!attrs[TIPC_NLA_LINK])
 689                 return -EINVAL;
 690
 691         err = nla_parse_nested_deprecated(link, TIPC_NLA_LINK_MAX,
 692                                           attrs[TIPC_NLA_LINK], NULL, NULL);
 693         if (err)
 694                 return err;
 695
 696         link_info.dest = nla_get_flag(link[TIPC_NLA_LINK_DEST]);
 697         link_info.up = htonl(nla_get_flag(link[TIPC_NLA_LINK_UP]));
 698         nla_strlcpy(link_info.str, link[TIPC_NLA_LINK_NAME],
 699                     TIPC_MAX_LINK_NAME);
 700
 701         return tipc_add_tlv(msg->rep, TIPC_TLV_LINK_INFO,
 702                             &link_info, sizeof(link_info));
 703 }
 704
 705 static int __tipc_add_link_prop(struct sk_buff *skb,
 706                                 struct tipc_nl_compat_msg *msg,
 707                                 struct tipc_link_config *lc)
 708 {
 709         switch (msg->cmd) {
 710         case TIPC_CMD_SET_LINK_PRI:
 711                 return nla_put_u32(skb, TIPC_NLA_PROP_PRIO, ntohl(lc->value));
 712         case TIPC_CMD_SET_LINK_TOL:
 713                 return nla_put_u32(skb, TIPC_NLA_PROP_TOL, ntohl(lc->value));
 714         case TIPC_CMD_SET_LINK_WINDOW:
 715                 return nla_put_u32(skb, TIPC_NLA_PROP_WIN, ntohl(lc->value));
 716         }
 717
 718         return -EINVAL;
 719 }
 720
 721 static int tipc_nl_compat_media_set(struct sk_buff *skb,
 722                                     struct tipc_nl_compat_msg *msg)
 723 {
 724         struct nlattr *prop;
 725         struct nlattr *media;
 726         struct tipc_link_config *lc;
 727
 728         lc = (struct tipc_link_config *)TLV_DATA(msg->req);
 729
 730         media = nla_nest_start_noflag(skb, TIPC_NLA_MEDIA);
 731         if (!media)
 732                 return -EMSGSIZE;
 733
 734         if (nla_put_string(skb, TIPC_NLA_MEDIA_NAME, lc->name))
 735                 return -EMSGSIZE;
 736
 737         prop = nla_nest_start_noflag(skb, TIPC_NLA_MEDIA_PROP);
 738         if (!prop)
 739                 return -EMSGSIZE;
 740
 741         __tipc_add_link_prop(skb, msg, lc);
 742         nla_nest_end(skb, prop);
 743         nla_nest_end(skb, media);
 744
 745         return 0;
 746 }
 747
 748 static int tipc_nl_compat_bearer_set(struct sk_buff *skb,
 749                                      struct tipc_nl_compat_msg *msg)
 750 {
 751         struct nlattr *prop;
 752         struct nlattr *bearer;
 753         struct tipc_link_config *lc;
 754
 755         lc = (struct tipc_link_config *)TLV_DATA(msg->req);
 756
 757         bearer = nla_nest_start_noflag(skb, TIPC_NLA_BEARER);
 758         if (!bearer)
 759                 return -EMSGSIZE;
 760
 761         if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, lc->name))
 762                 return -EMSGSIZE;
 763
 764         prop = nla_nest_start_noflag(skb, TIPC_NLA_BEARER_PROP);
 765         if (!prop)
 766                 return -EMSGSIZE;
 767
 768         __tipc_add_link_prop(skb, msg, lc);
 769         nla_nest_end(skb, prop);
 770         nla_nest_end(skb, bearer);
 771
 772         return 0;
 773 }
 774
 775 static int __tipc_nl_compat_link_set(struct sk_buff *skb,
 776                                      struct tipc_nl_compat_msg *msg)
 777 {
 778         struct nlattr *prop;
 779         struct nlattr *link;
 780         struct tipc_link_config *lc;
 781
 782         lc = (struct tipc_link_config *)TLV_DATA(msg->req);
 783
 784         link = nla_nest_start_noflag(skb, TIPC_NLA_LINK);
 785         if (!link)
 786                 return -EMSGSIZE;
 787
 788         if (nla_put_string(skb, TIPC_NLA_LINK_NAME, lc->name))
 789                 return -EMSGSIZE;
 790
 791         prop = nla_nest_start_noflag(skb, TIPC_NLA_LINK_PROP);
 792         if (!prop)
 793                 return -EMSGSIZE;
 794
 795         __tipc_add_link_prop(skb, msg, lc);
 796         nla_nest_end(skb, prop);
 797         nla_nest_end(skb, link);
 798
 799         return 0;
 800 }
 801
 802 static int tipc_nl_compat_link_set(struct tipc_nl_compat_cmd_doit *cmd,
 803                                    struct sk_buff *skb,
 804                                    struct tipc_nl_compat_msg *msg)
 805 {
 806         struct tipc_link_config *lc;
 807         struct tipc_bearer *bearer;
 808         struct tipc_media *media;
 809         int len;
 810
 811         lc = (struct tipc_link_config *)TLV_DATA(msg->req);
 812
 813         len = TLV_GET_DATA_LEN(msg->req);
 814         len -= offsetof(struct tipc_link_config, name);
 815         if (len <= 0)
 816                 return -EINVAL;
 817
 818         len = min_t(int, len, TIPC_MAX_LINK_NAME);
 819         if (!string_is_valid(lc->name, len))
 820                 return -EINVAL;
 821
 822         media = tipc_media_find(lc->name);
 823         if (media) {
 824                 cmd->doit = &__tipc_nl_media_set;
 825                 return tipc_nl_compat_media_set(skb, msg);
 826         }
 827
 828         bearer = tipc_bearer_find(msg->net, lc->name);
 829         if (bearer) {
 830                 cmd->doit = &__tipc_nl_bearer_set;
 831                 return tipc_nl_compat_bearer_set(skb, msg);
 832         }
 833
 834         return __tipc_nl_compat_link_set(skb, msg);
 835 }
 836
 837 static int tipc_nl_compat_link_reset_stats(struct tipc_nl_compat_cmd_doit *cmd,
 838                                            struct sk_buff *skb,
 839                                            struct tipc_nl_compat_msg *msg)
 840 {
 841         char *name;
 842         struct nlattr *link;
 843         int len;
 844
 845         name = (char *)TLV_DATA(msg->req);
 846
 847         link = nla_nest_start_noflag(skb, TIPC_NLA_LINK);
 848         if (!link)
 849                 return -EMSGSIZE;
 850
 851         len = TLV_GET_DATA_LEN(msg->req);
 852         if (len <= 0)
 853                 return -EINVAL;
 854
 855         len = min_t(int, len, TIPC_MAX_LINK_NAME);
 856         if (!string_is_valid(name, len))
 857                 return -EINVAL;
 858
 859         if (nla_put_string(skb, TIPC_NLA_LINK_NAME, name))
 860                 return -EMSGSIZE;
 861
 862         nla_nest_end(skb, link);
 863
 864         return 0;
 865 }
 866
 867 static int tipc_nl_compat_name_table_dump_header(struct tipc_nl_compat_msg *msg)
 868 {
 869         int i;
 870         u32 depth;
 871         struct tipc_name_table_query *ntq;
 872         static const char * const header[] = {
 873                 "Type       ",
 874                 "Lower      Upper      ",
 875                 "Port Identity              ",
 876                 "Publication Scope"
 877         };
 878
 879         ntq = (struct tipc_name_table_query *)TLV_DATA(msg->req);
 880         if (TLV_GET_DATA_LEN(msg->req) < sizeof(struct tipc_name_table_query))
 881                 return -EINVAL;
 882
 883         depth = ntohl(ntq->depth);
 884
 885         if (depth > 4)
 886                 depth = 4;
 887         for (i = 0; i < depth; i++)
 888                 tipc_tlv_sprintf(msg->rep, header[i]);
 889         tipc_tlv_sprintf(msg->rep, "\n");
 890
 891         return 0;
 892 }
 893
 894 static int tipc_nl_compat_name_table_dump(struct tipc_nl_compat_msg *msg,
 895                                           struct nlattr **attrs)
 896 {
 897         char port_str[27];
 898         struct tipc_name_table_query *ntq;
 899         struct nlattr *nt[TIPC_NLA_NAME_TABLE_MAX + 1];
 900         struct nlattr *publ[TIPC_NLA_PUBL_MAX + 1];
 901         u32 node, depth, type, lowbound, upbound;
 902         static const char * const scope_str[] = {"", " zone", " cluster",
 903                                                  " node"};
 904         int err;
 905
 906         if (!attrs[TIPC_NLA_NAME_TABLE])
 907                 return -EINVAL;
 908
 909         err = nla_parse_nested_deprecated(nt, TIPC_NLA_NAME_TABLE_MAX,
 910                                           attrs[TIPC_NLA_NAME_TABLE], NULL,
 911                                           NULL);
 912         if (err)
 913                 return err;
 914
 915         if (!nt[TIPC_NLA_NAME_TABLE_PUBL])
 916                 return -EINVAL;
 917
 918         err = nla_parse_nested_deprecated(publ, TIPC_NLA_PUBL_MAX,
 919                                           nt[TIPC_NLA_NAME_TABLE_PUBL], NULL,
 920                                           NULL);
 921         if (err)
 922                 return err;
 923
 924         ntq = (struct tipc_name_table_query *)TLV_DATA(msg->req);
 925
 926         depth = ntohl(ntq->depth);
 927         type = ntohl(ntq->type);
 928         lowbound = ntohl(ntq->lowbound);
 929         upbound = ntohl(ntq->upbound);
 930
 931         if (!(depth & TIPC_NTQ_ALLTYPES) &&
 932             (type != nla_get_u32(publ[TIPC_NLA_PUBL_TYPE])))
 933                 return 0;
 934         if (lowbound && (lowbound > nla_get_u32(publ[TIPC_NLA_PUBL_UPPER])))
 935                 return 0;
 936         if (upbound && (upbound < nla_get_u32(publ[TIPC_NLA_PUBL_LOWER])))
 937                 return 0;
 938
 939         tipc_tlv_sprintf(msg->rep, "%-10u ",
 940                          nla_get_u32(publ[TIPC_NLA_PUBL_TYPE]));
 941
 942         if (depth == 1)
 943                 goto out;
 944
 945         tipc_tlv_sprintf(msg->rep, "%-10u %-10u ",
 946                          nla_get_u32(publ[TIPC_NLA_PUBL_LOWER]),
 947                          nla_get_u32(publ[TIPC_NLA_PUBL_UPPER]));
 948
 949         if (depth == 2)
 950                 goto out;
 951
 952         node = nla_get_u32(publ[TIPC_NLA_PUBL_NODE]);
 953         sprintf(port_str, "<%u.%u.%u:%u>", tipc_zone(node), tipc_cluster(node),
 954                 tipc_node(node), nla_get_u32(publ[TIPC_NLA_PUBL_REF]));
 955         tipc_tlv_sprintf(msg->rep, "%-26s ", port_str);
 956
 957         if (depth == 3)
 958                 goto out;
 959
 960         tipc_tlv_sprintf(msg->rep, "%-10u %s",
 961                          nla_get_u32(publ[TIPC_NLA_PUBL_KEY]),
 962                          scope_str[nla_get_u32(publ[TIPC_NLA_PUBL_SCOPE])]);
 963 out:
 964         tipc_tlv_sprintf(msg->rep, "\n");
 965
 966         return 0;
 967 }
 968
 969 static int __tipc_nl_compat_publ_dump(struct tipc_nl_compat_msg *msg,
 970                                       struct nlattr **attrs)
 971 {
 972         u32 type, lower, upper;
 973         struct nlattr *publ[TIPC_NLA_PUBL_MAX + 1];
 974         int err;
 975
 976         if (!attrs[TIPC_NLA_PUBL])
 977                 return -EINVAL;
 978
 979         err = nla_parse_nested_deprecated(publ, TIPC_NLA_PUBL_MAX,
 980                                           attrs[TIPC_NLA_PUBL], NULL, NULL);
 981         if (err)
 982                 return err;
 983
 984         type = nla_get_u32(publ[TIPC_NLA_PUBL_TYPE]);
 985         lower = nla_get_u32(publ[TIPC_NLA_PUBL_LOWER]);
 986         upper = nla_get_u32(publ[TIPC_NLA_PUBL_UPPER]);
 987
 988         if (lower == upper)
 989                 tipc_tlv_sprintf(msg->rep, " {%u,%u}", type, lower);
 990         else
 991                 tipc_tlv_sprintf(msg->rep, " {%u,%u,%u}", type, lower, upper);
 992
 993         return 0;
 994 }
 995
 996 static int tipc_nl_compat_publ_dump(struct tipc_nl_compat_msg *msg, u32 sock)
 997 {
 998         int err;
 999         void *hdr;
1000         struct nlattr *nest;
1001         struct sk_buff *args;
1002         struct tipc_nl_compat_cmd_dump dump;
1003
1004         args = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1005         if (!args)
1006                 return -ENOMEM;
1007
1008         hdr = genlmsg_put(args, 0, 0, &tipc_genl_family, NLM_F_MULTI,
1009                           TIPC_NL_PUBL_GET);
1010         if (!hdr) {
1011                 kfree_skb(args);
1012                 return -EMSGSIZE;
1013         }
1014
1015         nest = nla_nest_start_noflag(args, TIPC_NLA_SOCK);
1016         if (!nest) {
1017                 kfree_skb(args);
1018                 return -EMSGSIZE;
1019         }
1020
1021         if (nla_put_u32(args, TIPC_NLA_SOCK_REF, sock)) {
1022                 kfree_skb(args);
1023                 return -EMSGSIZE;
1024         }
1025
1026         nla_nest_end(args, nest);
1027         genlmsg_end(args, hdr);
1028
1029         dump.dumpit = tipc_nl_publ_dump;
1030         dump.format = __tipc_nl_compat_publ_dump;
1031
1032         err = __tipc_nl_compat_dumpit(&dump, msg, args);
1033
1034         kfree_skb(args);
1035
1036         return err;
1037 }
1038
1039 static int tipc_nl_compat_sk_dump(struct tipc_nl_compat_msg *msg,
1040                                   struct nlattr **attrs)
1041 {
1042         int err;
1043         u32 sock_ref;
1044         struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
1045
1046         if (!attrs[TIPC_NLA_SOCK])
1047                 return -EINVAL;
1048
1049         err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX,
1050                                           attrs[TIPC_NLA_SOCK], NULL, NULL);
1051         if (err)
1052                 return err;
1053
1054         sock_ref = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
1055         tipc_tlv_sprintf(msg->rep, "%u:", sock_ref);
1056
1057         if (sock[TIPC_NLA_SOCK_CON]) {
1058                 u32 node;
1059                 struct nlattr *con[TIPC_NLA_CON_MAX + 1];
1060
1061                 err = nla_parse_nested_deprecated(con, TIPC_NLA_CON_MAX,
1062                                                   sock[TIPC_NLA_SOCK_CON],
1063                                                   NULL, NULL);
1064
1065                 if (err)
1066                         return err;
1067
1068                 node = nla_get_u32(con[TIPC_NLA_CON_NODE]);
1069                 tipc_tlv_sprintf(msg->rep, "  connected to <%u.%u.%u:%u>",
1070                                  tipc_zone(node),
1071                                  tipc_cluster(node),
1072                                  tipc_node(node),
1073                                  nla_get_u32(con[TIPC_NLA_CON_SOCK]));
1074
1075                 if (con[TIPC_NLA_CON_FLAG])
1076                         tipc_tlv_sprintf(msg->rep, " via {%u,%u}\n",
1077                                          nla_get_u32(con[TIPC_NLA_CON_TYPE]),
1078                                          nla_get_u32(con[TIPC_NLA_CON_INST]));
1079                 else
1080                         tipc_tlv_sprintf(msg->rep, "\n");
1081         } else if (sock[TIPC_NLA_SOCK_HAS_PUBL]) {
1082                 tipc_tlv_sprintf(msg->rep, " bound to");
1083
1084                 err = tipc_nl_compat_publ_dump(msg, sock_ref);
1085                 if (err)
1086                         return err;
1087         }
1088         tipc_tlv_sprintf(msg->rep, "\n");
1089
1090         return 0;
1091 }
1092
1093 static int tipc_nl_compat_media_dump(struct tipc_nl_compat_msg *msg,
1094                                      struct nlattr **attrs)
1095 {
1096         struct nlattr *media[TIPC_NLA_MEDIA_MAX + 1];
1097         int err;
1098
1099         if (!attrs[TIPC_NLA_MEDIA])
1100                 return -EINVAL;
1101
1102         err = nla_parse_nested_deprecated(media, TIPC_NLA_MEDIA_MAX,
1103                                           attrs[TIPC_NLA_MEDIA], NULL, NULL);
1104         if (err)
1105                 return err;
1106
1107         return tipc_add_tlv(msg->rep, TIPC_TLV_MEDIA_NAME,
1108                             nla_data(media[TIPC_NLA_MEDIA_NAME]),
1109                             nla_len(media[TIPC_NLA_MEDIA_NAME]));
1110 }
1111
1112 static int tipc_nl_compat_node_dump(struct tipc_nl_compat_msg *msg,
1113                                     struct nlattr **attrs)
1114 {
1115         struct tipc_node_info node_info;
1116         struct nlattr *node[TIPC_NLA_NODE_MAX + 1];
1117         int err;
1118
1119         if (!attrs[TIPC_NLA_NODE])
1120                 return -EINVAL;
1121
1122         err = nla_parse_nested_deprecated(node, TIPC_NLA_NODE_MAX,
1123                                           attrs[TIPC_NLA_NODE], NULL, NULL);
1124         if (err)
1125                 return err;
1126
1127         node_info.addr = htonl(nla_get_u32(node[TIPC_NLA_NODE_ADDR]));
1128         node_info.up = htonl(nla_get_flag(node[TIPC_NLA_NODE_UP]));
1129
1130         return tipc_add_tlv(msg->rep, TIPC_TLV_NODE_INFO, &node_info,
1131                             sizeof(node_info));
1132 }
1133
1134 static int tipc_nl_compat_net_set(struct tipc_nl_compat_cmd_doit *cmd,
1135                                   struct sk_buff *skb,
1136                                   struct tipc_nl_compat_msg *msg)
1137 {
1138         u32 val;
1139         struct nlattr *net;
1140
1141         val = ntohl(*(__be32 *)TLV_DATA(msg->req));
1142
1143         net = nla_nest_start_noflag(skb, TIPC_NLA_NET);
1144         if (!net)
1145                 return -EMSGSIZE;
1146
1147         if (msg->cmd == TIPC_CMD_SET_NODE_ADDR) {
1148                 if (nla_put_u32(skb, TIPC_NLA_NET_ADDR, val))
1149                         return -EMSGSIZE;
1150         } else if (msg->cmd == TIPC_CMD_SET_NETID) {
1151                 if (nla_put_u32(skb, TIPC_NLA_NET_ID, val))
1152                         return -EMSGSIZE;
1153         }
1154         nla_nest_end(skb, net);
1155
1156         return 0;
1157 }
1158
1159 static int tipc_nl_compat_net_dump(struct tipc_nl_compat_msg *msg,
1160                                    struct nlattr **attrs)
1161 {
1162         __be32 id;
1163         struct nlattr *net[TIPC_NLA_NET_MAX + 1];
1164         int err;
1165
1166         if (!attrs[TIPC_NLA_NET])
1167                 return -EINVAL;
1168
1169         err = nla_parse_nested_deprecated(net, TIPC_NLA_NET_MAX,
1170                                           attrs[TIPC_NLA_NET], NULL, NULL);
1171         if (err)
1172                 return err;
1173
1174         id = htonl(nla_get_u32(net[TIPC_NLA_NET_ID]));
1175
1176         return tipc_add_tlv(msg->rep, TIPC_TLV_UNSIGNED, &id, sizeof(id));
1177 }
1178
1179 static int tipc_cmd_show_stats_compat(struct tipc_nl_compat_msg *msg)
1180 {
1181         msg->rep = tipc_tlv_alloc(ULTRA_STRING_MAX_LEN);
1182         if (!msg->rep)
1183                 return -ENOMEM;
1184
1185         tipc_tlv_init(msg->rep, TIPC_TLV_ULTRA_STRING);
1186         tipc_tlv_sprintf(msg->rep, "TIPC version " TIPC_MOD_VER "\n");
1187
1188         return 0;
1189 }
1190
1191 static int tipc_nl_compat_handle(struct tipc_nl_compat_msg *msg)
1192 {
1193         struct tipc_nl_compat_cmd_dump dump;
1194         struct tipc_nl_compat_cmd_doit doit;
1195
1196         memset(&dump, 0, sizeof(dump));
1197         memset(&doit, 0, sizeof(doit));
1198
1199         switch (msg->cmd) {
1200         case TIPC_CMD_NOOP:
1201                 msg->rep = tipc_tlv_alloc(0);
1202                 if (!msg->rep)
1203                         return -ENOMEM;
1204                 return 0;
1205         case TIPC_CMD_GET_BEARER_NAMES:
1206                 msg->rep_size = MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME);
1207                 dump.dumpit = tipc_nl_bearer_dump;
1208                 dump.format = tipc_nl_compat_bearer_dump;
1209                 return tipc_nl_compat_dumpit(&dump, msg);
1210         case TIPC_CMD_ENABLE_BEARER:
1211                 msg->req_type = TIPC_TLV_BEARER_CONFIG;
1212                 doit.doit = __tipc_nl_bearer_enable;
1213                 doit.transcode = tipc_nl_compat_bearer_enable;
1214                 return tipc_nl_compat_doit(&doit, msg);
1215         case TIPC_CMD_DISABLE_BEARER:
1216                 msg->req_type = TIPC_TLV_BEARER_NAME;
1217                 doit.doit = __tipc_nl_bearer_disable;
1218                 doit.transcode = tipc_nl_compat_bearer_disable;
1219                 return tipc_nl_compat_doit(&doit, msg);
1220         case TIPC_CMD_SHOW_LINK_STATS:
1221                 msg->req_type = TIPC_TLV_LINK_NAME;
1222                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1223                 msg->rep_type = TIPC_TLV_ULTRA_STRING;
1224                 dump.dumpit = tipc_nl_node_dump_link;
1225                 dump.format = tipc_nl_compat_link_stat_dump;
1226                 return tipc_nl_compat_dumpit(&dump, msg);
1227         case TIPC_CMD_GET_LINKS:
1228                 msg->req_type = TIPC_TLV_NET_ADDR;
1229                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1230                 dump.dumpit = tipc_nl_node_dump_link;
1231                 dump.format = tipc_nl_compat_link_dump;
1232                 return tipc_nl_compat_dumpit(&dump, msg);
1233         case TIPC_CMD_SET_LINK_TOL:
1234         case TIPC_CMD_SET_LINK_PRI:
1235         case TIPC_CMD_SET_LINK_WINDOW:
1236                 msg->req_type =  TIPC_TLV_LINK_CONFIG;
1237                 doit.doit = tipc_nl_node_set_link;
1238                 doit.transcode = tipc_nl_compat_link_set;
1239                 return tipc_nl_compat_doit(&doit, msg);
1240         case TIPC_CMD_RESET_LINK_STATS:
1241                 msg->req_type = TIPC_TLV_LINK_NAME;
1242                 doit.doit = tipc_nl_node_reset_link_stats;
1243                 doit.transcode = tipc_nl_compat_link_reset_stats;
1244                 return tipc_nl_compat_doit(&doit, msg);
1245         case TIPC_CMD_SHOW_NAME_TABLE:
1246                 msg->req_type = TIPC_TLV_NAME_TBL_QUERY;
1247                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1248                 msg->rep_type = TIPC_TLV_ULTRA_STRING;
1249                 dump.header = tipc_nl_compat_name_table_dump_header;
1250                 dump.dumpit = tipc_nl_name_table_dump;
1251                 dump.format = tipc_nl_compat_name_table_dump;
1252                 return tipc_nl_compat_dumpit(&dump, msg);
1253         case TIPC_CMD_SHOW_PORTS:
1254                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1255                 msg->rep_type = TIPC_TLV_ULTRA_STRING;
1256                 dump.dumpit = tipc_nl_sk_dump;
1257                 dump.format = tipc_nl_compat_sk_dump;
1258                 return tipc_nl_compat_dumpit(&dump, msg);
1259         case TIPC_CMD_GET_MEDIA_NAMES:
1260                 msg->rep_size = MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME);
1261                 dump.dumpit = tipc_nl_media_dump;
1262                 dump.format = tipc_nl_compat_media_dump;
1263                 return tipc_nl_compat_dumpit(&dump, msg);
1264         case TIPC_CMD_GET_NODES:
1265                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1266                 dump.dumpit = tipc_nl_node_dump;
1267                 dump.format = tipc_nl_compat_node_dump;
1268                 return tipc_nl_compat_dumpit(&dump, msg);
1269         case TIPC_CMD_SET_NODE_ADDR:
1270                 msg->req_type = TIPC_TLV_NET_ADDR;
1271                 doit.doit = __tipc_nl_net_set;
1272                 doit.transcode = tipc_nl_compat_net_set;
1273                 return tipc_nl_compat_doit(&doit, msg);
1274         case TIPC_CMD_SET_NETID:
1275                 msg->req_type = TIPC_TLV_UNSIGNED;
1276                 doit.doit = __tipc_nl_net_set;
1277                 doit.transcode = tipc_nl_compat_net_set;
1278                 return tipc_nl_compat_doit(&doit, msg);
1279         case TIPC_CMD_GET_NETID:
1280                 msg->rep_size = sizeof(u32);
1281                 dump.dumpit = tipc_nl_net_dump;
1282                 dump.format = tipc_nl_compat_net_dump;
1283                 return tipc_nl_compat_dumpit(&dump, msg);
1284         case TIPC_CMD_SHOW_STATS:
1285                 return tipc_cmd_show_stats_compat(msg);
1286         }
1287
1288         return -EOPNOTSUPP;
1289 }
1290
1291 static int tipc_nl_compat_recv(struct sk_buff *skb, struct genl_info *info)
1292 {
1293         int err;
1294         int len;
1295         struct tipc_nl_compat_msg msg;
1296         struct nlmsghdr *req_nlh;
1297         struct nlmsghdr *rep_nlh;
1298         struct tipc_genlmsghdr *req_userhdr = info->userhdr;
1299
1300         memset(&msg, 0, sizeof(msg));
1301
1302         req_nlh = (struct nlmsghdr *)skb->data;
1303         msg.req = nlmsg_data(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN;
1304         msg.cmd = req_userhdr->cmd;
1305         msg.net = genl_info_net(info);
1306         msg.dst_sk = skb->sk;
1307
1308         if ((msg.cmd & 0xC000) && (!netlink_net_capable(skb, CAP_NET_ADMIN))) {
1309                 msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_NET_ADMIN);
1310                 err = -EACCES;
1311                 goto send;
1312         }
1313
1314         msg.req_size = nlmsg_attrlen(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN);
1315         if (msg.req_size && !TLV_OK(msg.req, msg.req_size)) {
1316                 msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED);
1317                 err = -EOPNOTSUPP;
1318                 goto send;
1319         }
1320
1321         err = tipc_nl_compat_handle(&msg);
1322         if ((err == -EOPNOTSUPP) || (err == -EPERM))
1323                 msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED);
1324         else if (err == -EINVAL)
1325                 msg.rep = tipc_get_err_tlv(TIPC_CFG_TLV_ERROR);
1326 send:
1327         if (!msg.rep)
1328                 return err;
1329
1330         len = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN);
1331         skb_push(msg.rep, len);
1332         rep_nlh = nlmsg_hdr(msg.rep);
1333         memcpy(rep_nlh, info->nlhdr, len);
1334         rep_nlh->nlmsg_len = msg.rep->len;
1335         genlmsg_unicast(msg.net, msg.rep, NETLINK_CB(skb).portid);
1336
1337         return err;
1338 }
1339
1340 static const struct genl_small_ops tipc_genl_compat_ops[] = {
1341         {
1342                 .cmd            = TIPC_GENL_CMD,
1343                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1344                 .doit           = tipc_nl_compat_recv,
1345         },
1346 };
1347
1348 static struct genl_family tipc_genl_compat_family __ro_after_init = {
1349         .name           = TIPC_GENL_NAME,
1350         .version        = TIPC_GENL_VERSION,
1351         .hdrsize        = TIPC_GENL_HDRLEN,
1352         .maxattr        = 0,
1353         .netnsok        = true,
1354         .module         = THIS_MODULE,
1355         .small_ops      = tipc_genl_compat_ops,
1356         .n_small_ops    = ARRAY_SIZE(tipc_genl_compat_ops),
1357 };
1358
1359 int __init tipc_netlink_compat_start(void)
1360 {
1361         int res;
1362
1363         res = genl_register_family(&tipc_genl_compat_family);
1364         if (res) {
1365                 pr_err("Failed to register legacy compat interface\n");
1366                 return res;
1367         }
1368
1369         return 0;
1370 }
1371
1372 void tipc_netlink_compat_stop(void)
1373 {
1374         genl_unregister_family(&tipc_genl_compat_family);
1375 }