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