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