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                 err = (*cmd->header)(msg);
 272                 if (err) {
 273                         kfree_skb(msg->rep);
 274                         msg->rep = NULL;
 275                         return err;
 276                 }
 277         }
 278
 279         arg = nlmsg_new(0, GFP_KERNEL);
 280         if (!arg) {
 281                 kfree_skb(msg->rep);
 282                 msg->rep = NULL;
 283                 return -ENOMEM;
 284         }
 285
 286         err = __tipc_nl_compat_dumpit(cmd, msg, arg);
 287         if (err) {
 288                 kfree_skb(msg->rep);
 289                 msg->rep = NULL;
 290         }
 291         kfree_skb(arg);
 292
 293         return err;
 294 }
 295
 296 static int __tipc_nl_compat_doit(struct tipc_nl_compat_cmd_doit *cmd,
 297                                  struct tipc_nl_compat_msg *msg)
 298 {
 299         int err;
 300         struct sk_buff *doit_buf;
 301         struct sk_buff *trans_buf;
 302         struct nlattr **attrbuf;
 303         struct genl_info info;
 304
 305         trans_buf = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 306         if (!trans_buf)
 307                 return -ENOMEM;
 308
 309         attrbuf = kmalloc_array(tipc_genl_family.maxattr + 1,
 310                                 sizeof(struct nlattr *),
 311                                 GFP_KERNEL);
 312         if (!attrbuf) {
 313                 err = -ENOMEM;
 314                 goto trans_out;
 315         }
 316
 317         doit_buf = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 318         if (!doit_buf) {
 319                 err = -ENOMEM;
 320                 goto attrbuf_out;
 321         }
 322
 323         memset(&info, 0, sizeof(info));
 324         info.attrs = attrbuf;
 325
 326         rtnl_lock();
 327         err = (*cmd->transcode)(cmd, trans_buf, msg);
 328         if (err)
 329                 goto doit_out;
 330
 331         err = nla_parse_deprecated(attrbuf, tipc_genl_family.maxattr,
 332                                    (const struct nlattr *)trans_buf->data,
 333                                    trans_buf->len, NULL, NULL);
 334         if (err)
 335                 goto doit_out;
 336
 337         doit_buf->sk = msg->dst_sk;
 338
 339         err = (*cmd->doit)(doit_buf, &info);
 340 doit_out:
 341         rtnl_unlock();
 342
 343         kfree_skb(doit_buf);
 344 attrbuf_out:
 345         kfree(attrbuf);
 346 trans_out:
 347         kfree_skb(trans_buf);
 348
 349         return err;
 350 }
 351
 352 static int tipc_nl_compat_doit(struct tipc_nl_compat_cmd_doit *cmd,
 353                                struct tipc_nl_compat_msg *msg)
 354 {
 355         int err;
 356
 357         if (msg->req_type && !TLV_CHECK_TYPE(msg->req, msg->req_type))
 358                 return -EINVAL;
 359
 360         err = __tipc_nl_compat_doit(cmd, msg);
 361         if (err)
 362                 return err;
 363
 364         /* The legacy API considered an empty message a success message */
 365         msg->rep = tipc_tlv_alloc(0);
 366         if (!msg->rep)
 367                 return -ENOMEM;
 368
 369         return 0;
 370 }
 371
 372 static int tipc_nl_compat_bearer_dump(struct tipc_nl_compat_msg *msg,
 373                                       struct nlattr **attrs)
 374 {
 375         struct nlattr *bearer[TIPC_NLA_BEARER_MAX + 1];
 376         int err;
 377
 378         if (!attrs[TIPC_NLA_BEARER])
 379                 return -EINVAL;
 380
 381         err = nla_parse_nested_deprecated(bearer, TIPC_NLA_BEARER_MAX,
 382                                           attrs[TIPC_NLA_BEARER], NULL, NULL);
 383         if (err)
 384                 return err;
 385
 386         return tipc_add_tlv(msg->rep, TIPC_TLV_BEARER_NAME,
 387                             nla_data(bearer[TIPC_NLA_BEARER_NAME]),
 388                             nla_len(bearer[TIPC_NLA_BEARER_NAME]));
 389 }
 390
 391 static int tipc_nl_compat_bearer_enable(struct tipc_nl_compat_cmd_doit *cmd,
 392                                         struct sk_buff *skb,
 393                                         struct tipc_nl_compat_msg *msg)
 394 {
 395         struct nlattr *prop;
 396         struct nlattr *bearer;
 397         struct tipc_bearer_config *b;
 398         int len;
 399
 400         b = (struct tipc_bearer_config *)TLV_DATA(msg->req);
 401
 402         bearer = nla_nest_start_noflag(skb, TIPC_NLA_BEARER);
 403         if (!bearer)
 404                 return -EMSGSIZE;
 405
 406         len = TLV_GET_DATA_LEN(msg->req);
 407         len -= offsetof(struct tipc_bearer_config, name);
 408         if (len <= 0)
 409                 return -EINVAL;
 410
 411         len = min_t(int, len, TIPC_MAX_BEARER_NAME);
 412         if (!string_is_valid(b->name, len))
 413                 return -EINVAL;
 414
 415         if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, b->name))
 416                 return -EMSGSIZE;
 417
 418         if (nla_put_u32(skb, TIPC_NLA_BEARER_DOMAIN, ntohl(b->disc_domain)))
 419                 return -EMSGSIZE;
 420
 421         if (ntohl(b->priority) <= TIPC_MAX_LINK_PRI) {
 422                 prop = nla_nest_start_noflag(skb, TIPC_NLA_BEARER_PROP);
 423                 if (!prop)
 424                         return -EMSGSIZE;
 425                 if (nla_put_u32(skb, TIPC_NLA_PROP_PRIO, ntohl(b->priority)))
 426                         return -EMSGSIZE;
 427                 nla_nest_end(skb, prop);
 428         }
 429         nla_nest_end(skb, bearer);
 430
 431         return 0;
 432 }
 433
 434 static int tipc_nl_compat_bearer_disable(struct tipc_nl_compat_cmd_doit *cmd,
 435                                          struct sk_buff *skb,
 436                                          struct tipc_nl_compat_msg *msg)
 437 {
 438         char *name;
 439         struct nlattr *bearer;
 440         int len;
 441
 442         name = (char *)TLV_DATA(msg->req);
 443
 444         bearer = nla_nest_start_noflag(skb, TIPC_NLA_BEARER);
 445         if (!bearer)
 446                 return -EMSGSIZE;
 447
 448         len = TLV_GET_DATA_LEN(msg->req);
 449         if (len <= 0)
 450                 return -EINVAL;
 451
 452         len = min_t(int, len, TIPC_MAX_BEARER_NAME);
 453         if (!string_is_valid(name, len))
 454                 return -EINVAL;
 455
 456         if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, name))
 457                 return -EMSGSIZE;
 458
 459         nla_nest_end(skb, bearer);
 460
 461         return 0;
 462 }
 463
 464 static inline u32 perc(u32 count, u32 total)
 465 {
 466         return (count * 100 + (total / 2)) / total;
 467 }
 468
 469 static void __fill_bc_link_stat(struct tipc_nl_compat_msg *msg,
 470                                 struct nlattr *prop[], struct nlattr *stats[])
 471 {
 472         tipc_tlv_sprintf(msg->rep, "  Window:%u packets\n",
 473                          nla_get_u32(prop[TIPC_NLA_PROP_WIN]));
 474
 475         tipc_tlv_sprintf(msg->rep,
 476                          "  RX packets:%u fragments:%u/%u bundles:%u/%u\n",
 477                          nla_get_u32(stats[TIPC_NLA_STATS_RX_INFO]),
 478                          nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTS]),
 479                          nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTED]),
 480                          nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLES]),
 481                          nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLED]));
 482
 483         tipc_tlv_sprintf(msg->rep,
 484                          "  TX packets:%u fragments:%u/%u bundles:%u/%u\n",
 485                          nla_get_u32(stats[TIPC_NLA_STATS_TX_INFO]),
 486                          nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTS]),
 487                          nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTED]),
 488                          nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLES]),
 489                          nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLED]));
 490
 491         tipc_tlv_sprintf(msg->rep, "  RX naks:%u defs:%u dups:%u\n",
 492                          nla_get_u32(stats[TIPC_NLA_STATS_RX_NACKS]),
 493                          nla_get_u32(stats[TIPC_NLA_STATS_RX_DEFERRED]),
 494                          nla_get_u32(stats[TIPC_NLA_STATS_DUPLICATES]));
 495
 496         tipc_tlv_sprintf(msg->rep, "  TX naks:%u acks:%u dups:%u\n",
 497                          nla_get_u32(stats[TIPC_NLA_STATS_TX_NACKS]),
 498                          nla_get_u32(stats[TIPC_NLA_STATS_TX_ACKS]),
 499                          nla_get_u32(stats[TIPC_NLA_STATS_RETRANSMITTED]));
 500
 501         tipc_tlv_sprintf(msg->rep,
 502                          "  Congestion link:%u  Send queue max:%u avg:%u",
 503                          nla_get_u32(stats[TIPC_NLA_STATS_LINK_CONGS]),
 504                          nla_get_u32(stats[TIPC_NLA_STATS_MAX_QUEUE]),
 505                          nla_get_u32(stats[TIPC_NLA_STATS_AVG_QUEUE]));
 506 }
 507
 508 static int tipc_nl_compat_link_stat_dump(struct tipc_nl_compat_msg *msg,
 509                                          struct nlattr **attrs)
 510 {
 511         char *name;
 512         struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
 513         struct nlattr *prop[TIPC_NLA_PROP_MAX + 1];
 514         struct nlattr *stats[TIPC_NLA_STATS_MAX + 1];
 515         int err;
 516         int len;
 517
 518         if (!attrs[TIPC_NLA_LINK])
 519                 return -EINVAL;
 520
 521         err = nla_parse_nested_deprecated(link, TIPC_NLA_LINK_MAX,
 522                                           attrs[TIPC_NLA_LINK], NULL, NULL);
 523         if (err)
 524                 return err;
 525
 526         if (!link[TIPC_NLA_LINK_PROP])
 527                 return -EINVAL;
 528
 529         err = nla_parse_nested_deprecated(prop, TIPC_NLA_PROP_MAX,
 530                                           link[TIPC_NLA_LINK_PROP], NULL,
 531                                           NULL);
 532         if (err)
 533                 return err;
 534
 535         if (!link[TIPC_NLA_LINK_STATS])
 536                 return -EINVAL;
 537
 538         err = nla_parse_nested_deprecated(stats, TIPC_NLA_STATS_MAX,
 539                                           link[TIPC_NLA_LINK_STATS], NULL,
 540                                           NULL);
 541         if (err)
 542                 return err;
 543
 544         name = (char *)TLV_DATA(msg->req);
 545
 546         len = TLV_GET_DATA_LEN(msg->req);
 547         if (len <= 0)
 548                 return -EINVAL;
 549
 550         len = min_t(int, len, TIPC_MAX_BEARER_NAME);
 551         if (!string_is_valid(name, len))
 552                 return -EINVAL;
 553
 554         if (strcmp(name, nla_data(link[TIPC_NLA_LINK_NAME])) != 0)
 555                 return 0;
 556
 557         tipc_tlv_sprintf(msg->rep, "\nLink <%s>\n",
 558                          nla_data(link[TIPC_NLA_LINK_NAME]));
 559
 560         if (link[TIPC_NLA_LINK_BROADCAST]) {
 561                 __fill_bc_link_stat(msg, prop, stats);
 562                 return 0;
 563         }
 564
 565         if (link[TIPC_NLA_LINK_ACTIVE])
 566                 tipc_tlv_sprintf(msg->rep, "  ACTIVE");
 567         else if (link[TIPC_NLA_LINK_UP])
 568                 tipc_tlv_sprintf(msg->rep, "  STANDBY");
 569         else
 570                 tipc_tlv_sprintf(msg->rep, "  DEFUNCT");
 571
 572         tipc_tlv_sprintf(msg->rep, "  MTU:%u  Priority:%u",
 573                          nla_get_u32(link[TIPC_NLA_LINK_MTU]),
 574                          nla_get_u32(prop[TIPC_NLA_PROP_PRIO]));
 575
 576         tipc_tlv_sprintf(msg->rep, "  Tolerance:%u ms  Window:%u packets\n",
 577                          nla_get_u32(prop[TIPC_NLA_PROP_TOL]),
 578                          nla_get_u32(prop[TIPC_NLA_PROP_WIN]));
 579
 580         tipc_tlv_sprintf(msg->rep,
 581                          "  RX packets:%u fragments:%u/%u bundles:%u/%u\n",
 582                          nla_get_u32(link[TIPC_NLA_LINK_RX]) -
 583                          nla_get_u32(stats[TIPC_NLA_STATS_RX_INFO]),
 584                          nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTS]),
 585                          nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTED]),
 586                          nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLES]),
 587                          nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLED]));
 588
 589         tipc_tlv_sprintf(msg->rep,
 590                          "  TX packets:%u fragments:%u/%u bundles:%u/%u\n",
 591                          nla_get_u32(link[TIPC_NLA_LINK_TX]) -
 592                          nla_get_u32(stats[TIPC_NLA_STATS_TX_INFO]),
 593                          nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTS]),
 594                          nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTED]),
 595                          nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLES]),
 596                          nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLED]));
 597
 598         tipc_tlv_sprintf(msg->rep,
 599                          "  TX profile sample:%u packets  average:%u octets\n",
 600                          nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_CNT]),
 601                          nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_TOT]) /
 602                          nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT]));
 603
 604         tipc_tlv_sprintf(msg->rep,
 605                          "  0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% ",
 606                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P0]),
 607                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 608                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P1]),
 609                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 610                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P2]),
 611                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 612                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P3]),
 613                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])));
 614
 615         tipc_tlv_sprintf(msg->rep, "-16384:%u%% -32768:%u%% -66000:%u%%\n",
 616                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P4]),
 617                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 618                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P5]),
 619                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 620                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P6]),
 621                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])));
 622
 623         tipc_tlv_sprintf(msg->rep,
 624                          "  RX states:%u probes:%u naks:%u defs:%u dups:%u\n",
 625                          nla_get_u32(stats[TIPC_NLA_STATS_RX_STATES]),
 626                          nla_get_u32(stats[TIPC_NLA_STATS_RX_PROBES]),
 627                          nla_get_u32(stats[TIPC_NLA_STATS_RX_NACKS]),
 628                          nla_get_u32(stats[TIPC_NLA_STATS_RX_DEFERRED]),
 629                          nla_get_u32(stats[TIPC_NLA_STATS_DUPLICATES]));
 630
 631         tipc_tlv_sprintf(msg->rep,
 632                          "  TX states:%u probes:%u naks:%u acks:%u dups:%u\n",
 633                          nla_get_u32(stats[TIPC_NLA_STATS_TX_STATES]),
 634                          nla_get_u32(stats[TIPC_NLA_STATS_TX_PROBES]),
 635                          nla_get_u32(stats[TIPC_NLA_STATS_TX_NACKS]),
 636                          nla_get_u32(stats[TIPC_NLA_STATS_TX_ACKS]),
 637                          nla_get_u32(stats[TIPC_NLA_STATS_RETRANSMITTED]));
 638
 639         tipc_tlv_sprintf(msg->rep,
 640                          "  Congestion link:%u  Send queue max:%u avg:%u",
 641                          nla_get_u32(stats[TIPC_NLA_STATS_LINK_CONGS]),
 642                          nla_get_u32(stats[TIPC_NLA_STATS_MAX_QUEUE]),
 643                          nla_get_u32(stats[TIPC_NLA_STATS_AVG_QUEUE]));
 644
 645         return 0;
 646 }
 647
 648 static int tipc_nl_compat_link_dump(struct tipc_nl_compat_msg *msg,
 649                                     struct nlattr **attrs)
 650 {
 651         struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
 652         struct tipc_link_info link_info;
 653         int err;
 654
 655         if (!attrs[TIPC_NLA_LINK])
 656                 return -EINVAL;
 657
 658         err = nla_parse_nested_deprecated(link, TIPC_NLA_LINK_MAX,
 659                                           attrs[TIPC_NLA_LINK], NULL, NULL);
 660         if (err)
 661                 return err;
 662
 663         link_info.dest = nla_get_flag(link[TIPC_NLA_LINK_DEST]);
 664         link_info.up = htonl(nla_get_flag(link[TIPC_NLA_LINK_UP]));
 665         nla_strlcpy(link_info.str, link[TIPC_NLA_LINK_NAME],
 666                     TIPC_MAX_LINK_NAME);
 667
 668         return tipc_add_tlv(msg->rep, TIPC_TLV_LINK_INFO,
 669                             &link_info, sizeof(link_info));
 670 }
 671
 672 static int __tipc_add_link_prop(struct sk_buff *skb,
 673                                 struct tipc_nl_compat_msg *msg,
 674                                 struct tipc_link_config *lc)
 675 {
 676         switch (msg->cmd) {
 677         case TIPC_CMD_SET_LINK_PRI:
 678                 return nla_put_u32(skb, TIPC_NLA_PROP_PRIO, ntohl(lc->value));
 679         case TIPC_CMD_SET_LINK_TOL:
 680                 return nla_put_u32(skb, TIPC_NLA_PROP_TOL, ntohl(lc->value));
 681         case TIPC_CMD_SET_LINK_WINDOW:
 682                 return nla_put_u32(skb, TIPC_NLA_PROP_WIN, ntohl(lc->value));
 683         }
 684
 685         return -EINVAL;
 686 }
 687
 688 static int tipc_nl_compat_media_set(struct sk_buff *skb,
 689                                     struct tipc_nl_compat_msg *msg)
 690 {
 691         struct nlattr *prop;
 692         struct nlattr *media;
 693         struct tipc_link_config *lc;
 694
 695         lc = (struct tipc_link_config *)TLV_DATA(msg->req);
 696
 697         media = nla_nest_start_noflag(skb, TIPC_NLA_MEDIA);
 698         if (!media)
 699                 return -EMSGSIZE;
 700
 701         if (nla_put_string(skb, TIPC_NLA_MEDIA_NAME, lc->name))
 702                 return -EMSGSIZE;
 703
 704         prop = nla_nest_start_noflag(skb, TIPC_NLA_MEDIA_PROP);
 705         if (!prop)
 706                 return -EMSGSIZE;
 707
 708         __tipc_add_link_prop(skb, msg, lc);
 709         nla_nest_end(skb, prop);
 710         nla_nest_end(skb, media);
 711
 712         return 0;
 713 }
 714
 715 static int tipc_nl_compat_bearer_set(struct sk_buff *skb,
 716                                      struct tipc_nl_compat_msg *msg)
 717 {
 718         struct nlattr *prop;
 719         struct nlattr *bearer;
 720         struct tipc_link_config *lc;
 721
 722         lc = (struct tipc_link_config *)TLV_DATA(msg->req);
 723
 724         bearer = nla_nest_start_noflag(skb, TIPC_NLA_BEARER);
 725         if (!bearer)
 726                 return -EMSGSIZE;
 727
 728         if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, lc->name))
 729                 return -EMSGSIZE;
 730
 731         prop = nla_nest_start_noflag(skb, TIPC_NLA_BEARER_PROP);
 732         if (!prop)
 733                 return -EMSGSIZE;
 734
 735         __tipc_add_link_prop(skb, msg, lc);
 736         nla_nest_end(skb, prop);
 737         nla_nest_end(skb, bearer);
 738
 739         return 0;
 740 }
 741
 742 static int __tipc_nl_compat_link_set(struct sk_buff *skb,
 743                                      struct tipc_nl_compat_msg *msg)
 744 {
 745         struct nlattr *prop;
 746         struct nlattr *link;
 747         struct tipc_link_config *lc;
 748
 749         lc = (struct tipc_link_config *)TLV_DATA(msg->req);
 750
 751         link = nla_nest_start_noflag(skb, TIPC_NLA_LINK);
 752         if (!link)
 753                 return -EMSGSIZE;
 754
 755         if (nla_put_string(skb, TIPC_NLA_LINK_NAME, lc->name))
 756                 return -EMSGSIZE;
 757
 758         prop = nla_nest_start_noflag(skb, TIPC_NLA_LINK_PROP);
 759         if (!prop)
 760                 return -EMSGSIZE;
 761
 762         __tipc_add_link_prop(skb, msg, lc);
 763         nla_nest_end(skb, prop);
 764         nla_nest_end(skb, link);
 765
 766         return 0;
 767 }
 768
 769 static int tipc_nl_compat_link_set(struct tipc_nl_compat_cmd_doit *cmd,
 770                                    struct sk_buff *skb,
 771                                    struct tipc_nl_compat_msg *msg)
 772 {
 773         struct tipc_link_config *lc;
 774         struct tipc_bearer *bearer;
 775         struct tipc_media *media;
 776         int len;
 777
 778         lc = (struct tipc_link_config *)TLV_DATA(msg->req);
 779
 780         len = TLV_GET_DATA_LEN(msg->req);
 781         len -= offsetof(struct tipc_link_config, name);
 782         if (len <= 0)
 783                 return -EINVAL;
 784
 785         len = min_t(int, len, TIPC_MAX_LINK_NAME);
 786         if (!string_is_valid(lc->name, len))
 787                 return -EINVAL;
 788
 789         media = tipc_media_find(lc->name);
 790         if (media) {
 791                 cmd->doit = &__tipc_nl_media_set;
 792                 return tipc_nl_compat_media_set(skb, msg);
 793         }
 794
 795         bearer = tipc_bearer_find(msg->net, lc->name);
 796         if (bearer) {
 797                 cmd->doit = &__tipc_nl_bearer_set;
 798                 return tipc_nl_compat_bearer_set(skb, msg);
 799         }
 800
 801         return __tipc_nl_compat_link_set(skb, msg);
 802 }
 803
 804 static int tipc_nl_compat_link_reset_stats(struct tipc_nl_compat_cmd_doit *cmd,
 805                                            struct sk_buff *skb,
 806                                            struct tipc_nl_compat_msg *msg)
 807 {
 808         char *name;
 809         struct nlattr *link;
 810         int len;
 811
 812         name = (char *)TLV_DATA(msg->req);
 813
 814         link = nla_nest_start_noflag(skb, TIPC_NLA_LINK);
 815         if (!link)
 816                 return -EMSGSIZE;
 817
 818         len = TLV_GET_DATA_LEN(msg->req);
 819         if (len <= 0)
 820                 return -EINVAL;
 821
 822         len = min_t(int, len, TIPC_MAX_BEARER_NAME);
 823         if (!string_is_valid(name, len))
 824                 return -EINVAL;
 825
 826         if (nla_put_string(skb, TIPC_NLA_LINK_NAME, name))
 827                 return -EMSGSIZE;
 828
 829         nla_nest_end(skb, link);
 830
 831         return 0;
 832 }
 833
 834 static int tipc_nl_compat_name_table_dump_header(struct tipc_nl_compat_msg *msg)
 835 {
 836         int i;
 837         u32 depth;
 838         struct tipc_name_table_query *ntq;
 839         static const char * const header[] = {
 840                 "Type       ",
 841                 "Lower      Upper      ",
 842                 "Port Identity              ",
 843                 "Publication Scope"
 844         };
 845
 846         ntq = (struct tipc_name_table_query *)TLV_DATA(msg->req);
 847         if (TLV_GET_DATA_LEN(msg->req) < sizeof(struct tipc_name_table_query))
 848                 return -EINVAL;
 849
 850         depth = ntohl(ntq->depth);
 851
 852         if (depth > 4)
 853                 depth = 4;
 854         for (i = 0; i < depth; i++)
 855                 tipc_tlv_sprintf(msg->rep, header[i]);
 856         tipc_tlv_sprintf(msg->rep, "\n");
 857
 858         return 0;
 859 }
 860
 861 static int tipc_nl_compat_name_table_dump(struct tipc_nl_compat_msg *msg,
 862                                           struct nlattr **attrs)
 863 {
 864         char port_str[27];
 865         struct tipc_name_table_query *ntq;
 866         struct nlattr *nt[TIPC_NLA_NAME_TABLE_MAX + 1];
 867         struct nlattr *publ[TIPC_NLA_PUBL_MAX + 1];
 868         u32 node, depth, type, lowbound, upbound;
 869         static const char * const scope_str[] = {"", " zone", " cluster",
 870                                                  " node"};
 871         int err;
 872
 873         if (!attrs[TIPC_NLA_NAME_TABLE])
 874                 return -EINVAL;
 875
 876         err = nla_parse_nested_deprecated(nt, TIPC_NLA_NAME_TABLE_MAX,
 877                                           attrs[TIPC_NLA_NAME_TABLE], NULL,
 878                                           NULL);
 879         if (err)
 880                 return err;
 881
 882         if (!nt[TIPC_NLA_NAME_TABLE_PUBL])
 883                 return -EINVAL;
 884
 885         err = nla_parse_nested_deprecated(publ, TIPC_NLA_PUBL_MAX,
 886                                           nt[TIPC_NLA_NAME_TABLE_PUBL], NULL,
 887                                           NULL);
 888         if (err)
 889                 return err;
 890
 891         ntq = (struct tipc_name_table_query *)TLV_DATA(msg->req);
 892
 893         depth = ntohl(ntq->depth);
 894         type = ntohl(ntq->type);
 895         lowbound = ntohl(ntq->lowbound);
 896         upbound = ntohl(ntq->upbound);
 897
 898         if (!(depth & TIPC_NTQ_ALLTYPES) &&
 899             (type != nla_get_u32(publ[TIPC_NLA_PUBL_TYPE])))
 900                 return 0;
 901         if (lowbound && (lowbound > nla_get_u32(publ[TIPC_NLA_PUBL_UPPER])))
 902                 return 0;
 903         if (upbound && (upbound < nla_get_u32(publ[TIPC_NLA_PUBL_LOWER])))
 904                 return 0;
 905
 906         tipc_tlv_sprintf(msg->rep, "%-10u ",
 907                          nla_get_u32(publ[TIPC_NLA_PUBL_TYPE]));
 908
 909         if (depth == 1)
 910                 goto out;
 911
 912         tipc_tlv_sprintf(msg->rep, "%-10u %-10u ",
 913                          nla_get_u32(publ[TIPC_NLA_PUBL_LOWER]),
 914                          nla_get_u32(publ[TIPC_NLA_PUBL_UPPER]));
 915
 916         if (depth == 2)
 917                 goto out;
 918
 919         node = nla_get_u32(publ[TIPC_NLA_PUBL_NODE]);
 920         sprintf(port_str, "<%u.%u.%u:%u>", tipc_zone(node), tipc_cluster(node),
 921                 tipc_node(node), nla_get_u32(publ[TIPC_NLA_PUBL_REF]));
 922         tipc_tlv_sprintf(msg->rep, "%-26s ", port_str);
 923
 924         if (depth == 3)
 925                 goto out;
 926
 927         tipc_tlv_sprintf(msg->rep, "%-10u %s",
 928                          nla_get_u32(publ[TIPC_NLA_PUBL_KEY]),
 929                          scope_str[nla_get_u32(publ[TIPC_NLA_PUBL_SCOPE])]);
 930 out:
 931         tipc_tlv_sprintf(msg->rep, "\n");
 932
 933         return 0;
 934 }
 935
 936 static int __tipc_nl_compat_publ_dump(struct tipc_nl_compat_msg *msg,
 937                                       struct nlattr **attrs)
 938 {
 939         u32 type, lower, upper;
 940         struct nlattr *publ[TIPC_NLA_PUBL_MAX + 1];
 941         int err;
 942
 943         if (!attrs[TIPC_NLA_PUBL])
 944                 return -EINVAL;
 945
 946         err = nla_parse_nested_deprecated(publ, TIPC_NLA_PUBL_MAX,
 947                                           attrs[TIPC_NLA_PUBL], NULL, NULL);
 948         if (err)
 949                 return err;
 950
 951         type = nla_get_u32(publ[TIPC_NLA_PUBL_TYPE]);
 952         lower = nla_get_u32(publ[TIPC_NLA_PUBL_LOWER]);
 953         upper = nla_get_u32(publ[TIPC_NLA_PUBL_UPPER]);
 954
 955         if (lower == upper)
 956                 tipc_tlv_sprintf(msg->rep, " {%u,%u}", type, lower);
 957         else
 958                 tipc_tlv_sprintf(msg->rep, " {%u,%u,%u}", type, lower, upper);
 959
 960         return 0;
 961 }
 962
 963 static int tipc_nl_compat_publ_dump(struct tipc_nl_compat_msg *msg, u32 sock)
 964 {
 965         int err;
 966         void *hdr;
 967         struct nlattr *nest;
 968         struct sk_buff *args;
 969         struct tipc_nl_compat_cmd_dump dump;
 970
 971         args = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 972         if (!args)
 973                 return -ENOMEM;
 974
 975         hdr = genlmsg_put(args, 0, 0, &tipc_genl_family, NLM_F_MULTI,
 976                           TIPC_NL_PUBL_GET);
 977         if (!hdr) {
 978                 kfree_skb(args);
 979                 return -EMSGSIZE;
 980         }
 981
 982         nest = nla_nest_start_noflag(args, TIPC_NLA_SOCK);
 983         if (!nest) {
 984                 kfree_skb(args);
 985                 return -EMSGSIZE;
 986         }
 987
 988         if (nla_put_u32(args, TIPC_NLA_SOCK_REF, sock)) {
 989                 kfree_skb(args);
 990                 return -EMSGSIZE;
 991         }
 992
 993         nla_nest_end(args, nest);
 994         genlmsg_end(args, hdr);
 995
 996         dump.dumpit = tipc_nl_publ_dump;
 997         dump.format = __tipc_nl_compat_publ_dump;
 998
 999         err = __tipc_nl_compat_dumpit(&dump, msg, args);
1000
1001         kfree_skb(args);
1002
1003         return err;
1004 }
1005
1006 static int tipc_nl_compat_sk_dump(struct tipc_nl_compat_msg *msg,
1007                                   struct nlattr **attrs)
1008 {
1009         int err;
1010         u32 sock_ref;
1011         struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
1012
1013         if (!attrs[TIPC_NLA_SOCK])
1014                 return -EINVAL;
1015
1016         err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX,
1017                                           attrs[TIPC_NLA_SOCK], NULL, NULL);
1018         if (err)
1019                 return err;
1020
1021         sock_ref = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
1022         tipc_tlv_sprintf(msg->rep, "%u:", sock_ref);
1023
1024         if (sock[TIPC_NLA_SOCK_CON]) {
1025                 u32 node;
1026                 struct nlattr *con[TIPC_NLA_CON_MAX + 1];
1027
1028                 err = nla_parse_nested_deprecated(con, TIPC_NLA_CON_MAX,
1029                                                   sock[TIPC_NLA_SOCK_CON],
1030                                                   NULL, NULL);
1031
1032                 if (err)
1033                         return err;
1034
1035                 node = nla_get_u32(con[TIPC_NLA_CON_NODE]);
1036                 tipc_tlv_sprintf(msg->rep, "  connected to <%u.%u.%u:%u>",
1037                                  tipc_zone(node),
1038                                  tipc_cluster(node),
1039                                  tipc_node(node),
1040                                  nla_get_u32(con[TIPC_NLA_CON_SOCK]));
1041
1042                 if (con[TIPC_NLA_CON_FLAG])
1043                         tipc_tlv_sprintf(msg->rep, " via {%u,%u}\n",
1044                                          nla_get_u32(con[TIPC_NLA_CON_TYPE]),
1045                                          nla_get_u32(con[TIPC_NLA_CON_INST]));
1046                 else
1047                         tipc_tlv_sprintf(msg->rep, "\n");
1048         } else if (sock[TIPC_NLA_SOCK_HAS_PUBL]) {
1049                 tipc_tlv_sprintf(msg->rep, " bound to");
1050
1051                 err = tipc_nl_compat_publ_dump(msg, sock_ref);
1052                 if (err)
1053                         return err;
1054         }
1055         tipc_tlv_sprintf(msg->rep, "\n");
1056
1057         return 0;
1058 }
1059
1060 static int tipc_nl_compat_media_dump(struct tipc_nl_compat_msg *msg,
1061                                      struct nlattr **attrs)
1062 {
1063         struct nlattr *media[TIPC_NLA_MEDIA_MAX + 1];
1064         int err;
1065
1066         if (!attrs[TIPC_NLA_MEDIA])
1067                 return -EINVAL;
1068
1069         err = nla_parse_nested_deprecated(media, TIPC_NLA_MEDIA_MAX,
1070                                           attrs[TIPC_NLA_MEDIA], NULL, NULL);
1071         if (err)
1072                 return err;
1073
1074         return tipc_add_tlv(msg->rep, TIPC_TLV_MEDIA_NAME,
1075                             nla_data(media[TIPC_NLA_MEDIA_NAME]),
1076                             nla_len(media[TIPC_NLA_MEDIA_NAME]));
1077 }
1078
1079 static int tipc_nl_compat_node_dump(struct tipc_nl_compat_msg *msg,
1080                                     struct nlattr **attrs)
1081 {
1082         struct tipc_node_info node_info;
1083         struct nlattr *node[TIPC_NLA_NODE_MAX + 1];
1084         int err;
1085
1086         if (!attrs[TIPC_NLA_NODE])
1087                 return -EINVAL;
1088
1089         err = nla_parse_nested_deprecated(node, TIPC_NLA_NODE_MAX,
1090                                           attrs[TIPC_NLA_NODE], NULL, NULL);
1091         if (err)
1092                 return err;
1093
1094         node_info.addr = htonl(nla_get_u32(node[TIPC_NLA_NODE_ADDR]));
1095         node_info.up = htonl(nla_get_flag(node[TIPC_NLA_NODE_UP]));
1096
1097         return tipc_add_tlv(msg->rep, TIPC_TLV_NODE_INFO, &node_info,
1098                             sizeof(node_info));
1099 }
1100
1101 static int tipc_nl_compat_net_set(struct tipc_nl_compat_cmd_doit *cmd,
1102                                   struct sk_buff *skb,
1103                                   struct tipc_nl_compat_msg *msg)
1104 {
1105         u32 val;
1106         struct nlattr *net;
1107
1108         val = ntohl(*(__be32 *)TLV_DATA(msg->req));
1109
1110         net = nla_nest_start_noflag(skb, TIPC_NLA_NET);
1111         if (!net)
1112                 return -EMSGSIZE;
1113
1114         if (msg->cmd == TIPC_CMD_SET_NODE_ADDR) {
1115                 if (nla_put_u32(skb, TIPC_NLA_NET_ADDR, val))
1116                         return -EMSGSIZE;
1117         } else if (msg->cmd == TIPC_CMD_SET_NETID) {
1118                 if (nla_put_u32(skb, TIPC_NLA_NET_ID, val))
1119                         return -EMSGSIZE;
1120         }
1121         nla_nest_end(skb, net);
1122
1123         return 0;
1124 }
1125
1126 static int tipc_nl_compat_net_dump(struct tipc_nl_compat_msg *msg,
1127                                    struct nlattr **attrs)
1128 {
1129         __be32 id;
1130         struct nlattr *net[TIPC_NLA_NET_MAX + 1];
1131         int err;
1132
1133         if (!attrs[TIPC_NLA_NET])
1134                 return -EINVAL;
1135
1136         err = nla_parse_nested_deprecated(net, TIPC_NLA_NET_MAX,
1137                                           attrs[TIPC_NLA_NET], NULL, NULL);
1138         if (err)
1139                 return err;
1140
1141         id = htonl(nla_get_u32(net[TIPC_NLA_NET_ID]));
1142
1143         return tipc_add_tlv(msg->rep, TIPC_TLV_UNSIGNED, &id, sizeof(id));
1144 }
1145
1146 static int tipc_cmd_show_stats_compat(struct tipc_nl_compat_msg *msg)
1147 {
1148         msg->rep = tipc_tlv_alloc(ULTRA_STRING_MAX_LEN);
1149         if (!msg->rep)
1150                 return -ENOMEM;
1151
1152         tipc_tlv_init(msg->rep, TIPC_TLV_ULTRA_STRING);
1153         tipc_tlv_sprintf(msg->rep, "TIPC version " TIPC_MOD_VER "\n");
1154
1155         return 0;
1156 }
1157
1158 static int tipc_nl_compat_handle(struct tipc_nl_compat_msg *msg)
1159 {
1160         struct tipc_nl_compat_cmd_dump dump;
1161         struct tipc_nl_compat_cmd_doit doit;
1162
1163         memset(&dump, 0, sizeof(dump));
1164         memset(&doit, 0, sizeof(doit));
1165
1166         switch (msg->cmd) {
1167         case TIPC_CMD_NOOP:
1168                 msg->rep = tipc_tlv_alloc(0);
1169                 if (!msg->rep)
1170                         return -ENOMEM;
1171                 return 0;
1172         case TIPC_CMD_GET_BEARER_NAMES:
1173                 msg->rep_size = MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME);
1174                 dump.dumpit = tipc_nl_bearer_dump;
1175                 dump.format = tipc_nl_compat_bearer_dump;
1176                 return tipc_nl_compat_dumpit(&dump, msg);
1177         case TIPC_CMD_ENABLE_BEARER:
1178                 msg->req_type = TIPC_TLV_BEARER_CONFIG;
1179                 doit.doit = __tipc_nl_bearer_enable;
1180                 doit.transcode = tipc_nl_compat_bearer_enable;
1181                 return tipc_nl_compat_doit(&doit, msg);
1182         case TIPC_CMD_DISABLE_BEARER:
1183                 msg->req_type = TIPC_TLV_BEARER_NAME;
1184                 doit.doit = __tipc_nl_bearer_disable;
1185                 doit.transcode = tipc_nl_compat_bearer_disable;
1186                 return tipc_nl_compat_doit(&doit, msg);
1187         case TIPC_CMD_SHOW_LINK_STATS:
1188                 msg->req_type = TIPC_TLV_LINK_NAME;
1189                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1190                 msg->rep_type = TIPC_TLV_ULTRA_STRING;
1191                 dump.dumpit = tipc_nl_node_dump_link;
1192                 dump.format = tipc_nl_compat_link_stat_dump;
1193                 return tipc_nl_compat_dumpit(&dump, msg);
1194         case TIPC_CMD_GET_LINKS:
1195                 msg->req_type = TIPC_TLV_NET_ADDR;
1196                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1197                 dump.dumpit = tipc_nl_node_dump_link;
1198                 dump.format = tipc_nl_compat_link_dump;
1199                 return tipc_nl_compat_dumpit(&dump, msg);
1200         case TIPC_CMD_SET_LINK_TOL:
1201         case TIPC_CMD_SET_LINK_PRI:
1202         case TIPC_CMD_SET_LINK_WINDOW:
1203                 msg->req_type =  TIPC_TLV_LINK_CONFIG;
1204                 doit.doit = tipc_nl_node_set_link;
1205                 doit.transcode = tipc_nl_compat_link_set;
1206                 return tipc_nl_compat_doit(&doit, msg);
1207         case TIPC_CMD_RESET_LINK_STATS:
1208                 msg->req_type = TIPC_TLV_LINK_NAME;
1209                 doit.doit = tipc_nl_node_reset_link_stats;
1210                 doit.transcode = tipc_nl_compat_link_reset_stats;
1211                 return tipc_nl_compat_doit(&doit, msg);
1212         case TIPC_CMD_SHOW_NAME_TABLE:
1213                 msg->req_type = TIPC_TLV_NAME_TBL_QUERY;
1214                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1215                 msg->rep_type = TIPC_TLV_ULTRA_STRING;
1216                 dump.header = tipc_nl_compat_name_table_dump_header;
1217                 dump.dumpit = tipc_nl_name_table_dump;
1218                 dump.format = tipc_nl_compat_name_table_dump;
1219                 return tipc_nl_compat_dumpit(&dump, msg);
1220         case TIPC_CMD_SHOW_PORTS:
1221                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1222                 msg->rep_type = TIPC_TLV_ULTRA_STRING;
1223                 dump.dumpit = tipc_nl_sk_dump;
1224                 dump.format = tipc_nl_compat_sk_dump;
1225                 return tipc_nl_compat_dumpit(&dump, msg);
1226         case TIPC_CMD_GET_MEDIA_NAMES:
1227                 msg->rep_size = MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME);
1228                 dump.dumpit = tipc_nl_media_dump;
1229                 dump.format = tipc_nl_compat_media_dump;
1230                 return tipc_nl_compat_dumpit(&dump, msg);
1231         case TIPC_CMD_GET_NODES:
1232                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1233                 dump.dumpit = tipc_nl_node_dump;
1234                 dump.format = tipc_nl_compat_node_dump;
1235                 return tipc_nl_compat_dumpit(&dump, msg);
1236         case TIPC_CMD_SET_NODE_ADDR:
1237                 msg->req_type = TIPC_TLV_NET_ADDR;
1238                 doit.doit = __tipc_nl_net_set;
1239                 doit.transcode = tipc_nl_compat_net_set;
1240                 return tipc_nl_compat_doit(&doit, msg);
1241         case TIPC_CMD_SET_NETID:
1242                 msg->req_type = TIPC_TLV_UNSIGNED;
1243                 doit.doit = __tipc_nl_net_set;
1244                 doit.transcode = tipc_nl_compat_net_set;
1245                 return tipc_nl_compat_doit(&doit, msg);
1246         case TIPC_CMD_GET_NETID:
1247                 msg->rep_size = sizeof(u32);
1248                 dump.dumpit = tipc_nl_net_dump;
1249                 dump.format = tipc_nl_compat_net_dump;
1250                 return tipc_nl_compat_dumpit(&dump, msg);
1251         case TIPC_CMD_SHOW_STATS:
1252                 return tipc_cmd_show_stats_compat(msg);
1253         }
1254
1255         return -EOPNOTSUPP;
1256 }
1257
1258 static int tipc_nl_compat_recv(struct sk_buff *skb, struct genl_info *info)
1259 {
1260         int err;
1261         int len;
1262         struct tipc_nl_compat_msg msg;
1263         struct nlmsghdr *req_nlh;
1264         struct nlmsghdr *rep_nlh;
1265         struct tipc_genlmsghdr *req_userhdr = info->userhdr;
1266
1267         memset(&msg, 0, sizeof(msg));
1268
1269         req_nlh = (struct nlmsghdr *)skb->data;
1270         msg.req = nlmsg_data(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN;
1271         msg.cmd = req_userhdr->cmd;
1272         msg.net = genl_info_net(info);
1273         msg.dst_sk = skb->sk;
1274
1275         if ((msg.cmd & 0xC000) && (!netlink_net_capable(skb, CAP_NET_ADMIN))) {
1276                 msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_NET_ADMIN);
1277                 err = -EACCES;
1278                 goto send;
1279         }
1280
1281         len = nlmsg_attrlen(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN);
1282         if (!len || !TLV_OK(msg.req, len)) {
1283                 msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED);
1284                 err = -EOPNOTSUPP;
1285                 goto send;
1286         }
1287
1288         err = tipc_nl_compat_handle(&msg);
1289         if ((err == -EOPNOTSUPP) || (err == -EPERM))
1290                 msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED);
1291         else if (err == -EINVAL)
1292                 msg.rep = tipc_get_err_tlv(TIPC_CFG_TLV_ERROR);
1293 send:
1294         if (!msg.rep)
1295                 return err;
1296
1297         len = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN);
1298         skb_push(msg.rep, len);
1299         rep_nlh = nlmsg_hdr(msg.rep);
1300         memcpy(rep_nlh, info->nlhdr, len);
1301         rep_nlh->nlmsg_len = msg.rep->len;
1302         genlmsg_unicast(msg.net, msg.rep, NETLINK_CB(skb).portid);
1303
1304         return err;
1305 }
1306
1307 static const struct genl_ops tipc_genl_compat_ops[] = {
1308         {
1309                 .cmd            = TIPC_GENL_CMD,
1310                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1311                 .doit           = tipc_nl_compat_recv,
1312         },
1313 };
1314
1315 static struct genl_family tipc_genl_compat_family __ro_after_init = {
1316         .name           = TIPC_GENL_NAME,
1317         .version        = TIPC_GENL_VERSION,
1318         .hdrsize        = TIPC_GENL_HDRLEN,
1319         .maxattr        = 0,
1320         .netnsok        = true,
1321         .module         = THIS_MODULE,
1322         .ops            = tipc_genl_compat_ops,
1323         .n_ops          = ARRAY_SIZE(tipc_genl_compat_ops),
1324 };
1325
1326 int __init tipc_netlink_compat_start(void)
1327 {
1328         int res;
1329
1330         res = genl_register_family(&tipc_genl_compat_family);
1331         if (res) {
1332                 pr_err("Failed to register legacy compat interface\n");
1333                 return res;
1334         }
1335
1336         return 0;
1337 }
1338
1339 void tipc_netlink_compat_stop(void)
1340 {
1341         genl_unregister_family(&tipc_genl_compat_family);
1342 }