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