net/tipc/netlink_compat.c

   1 /*
   2  * Copyright (c) 2014, Ericsson AB
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the names of the copyright holders nor the names of its
  14  *    contributors may be used to endorse or promote products derived from
  15  *    this software without specific prior written permission.
  16  *
  17  * Alternatively, this software may be distributed under the terms of the
  18  * GNU General Public License ("GPL") version 2 as published by the Free
  19  * Software Foundation.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  25  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31  * POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include "core.h"
  35 #include "bearer.h"
  36 #include "link.h"
  37 #include "name_table.h"
  38 #include "socket.h"
  39 #include "node.h"
  40 #include "net.h"
  41 #include <net/genetlink.h>
  42 #include <linux/tipc_config.h>
  43
  44 /* The legacy API had an artificial message length limit called
  45  * ULTRA_STRING_MAX_LEN.
  46  */
  47 #define ULTRA_STRING_MAX_LEN 32768
  48
  49 #define TIPC_SKB_MAX TLV_SPACE(ULTRA_STRING_MAX_LEN)
  50
  51 #define REPLY_TRUNCATED "<truncated>\n"
  52
  53 struct tipc_nl_compat_msg {
  54         u16 cmd;
  55         int rep_type;
  56         int rep_size;
  57         int req_type;
  58         int req_size;
  59         struct net *net;
  60         struct sk_buff *rep;
  61         struct tlv_desc *req;
  62         struct sock *dst_sk;
  63 };
  64
  65 struct tipc_nl_compat_cmd_dump {
  66         int (*header)(struct tipc_nl_compat_msg *);
  67         int (*dumpit)(struct sk_buff *, struct netlink_callback *);
  68         int (*format)(struct tipc_nl_compat_msg *msg, struct nlattr **attrs);
  69 };
  70
  71 struct tipc_nl_compat_cmd_doit {
  72         int (*doit)(struct sk_buff *skb, struct genl_info *info);
  73         int (*transcode)(struct tipc_nl_compat_cmd_doit *cmd,
  74                          struct sk_buff *skb, struct tipc_nl_compat_msg *msg);
  75 };
  76
  77 static int tipc_skb_tailroom(struct sk_buff *skb)
  78 {
  79         int tailroom;
  80         int limit;
  81
  82         tailroom = skb_tailroom(skb);
  83         limit = TIPC_SKB_MAX - skb->len;
  84
  85         if (tailroom < limit)
  86                 return tailroom;
  87
  88         return limit;
  89 }
  90
  91 static inline int TLV_GET_DATA_LEN(struct tlv_desc *tlv)
  92 {
  93         return TLV_GET_LEN(tlv) - TLV_SPACE(0);
  94 }
  95
  96 static int tipc_add_tlv(struct sk_buff *skb, u16 type, void *data, u16 len)
  97 {
  98         struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(skb);
  99
 100         if (tipc_skb_tailroom(skb) < TLV_SPACE(len))
 101                 return -EMSGSIZE;
 102
 103         skb_put(skb, TLV_SPACE(len));
 104         tlv->tlv_type = htons(type);
 105         tlv->tlv_len = htons(TLV_LENGTH(len));
 106         if (len && data)
 107                 memcpy(TLV_DATA(tlv), data, len);
 108
 109         return 0;
 110 }
 111
 112 static void tipc_tlv_init(struct sk_buff *skb, u16 type)
 113 {
 114         struct tlv_desc *tlv = (struct tlv_desc *)skb->data;
 115
 116         TLV_SET_LEN(tlv, 0);
 117         TLV_SET_TYPE(tlv, type);
 118         skb_put(skb, sizeof(struct tlv_desc));
 119 }
 120
 121 static __printf(2, 3) int tipc_tlv_sprintf(struct sk_buff *skb,
 122                                            const char *fmt, ...)
 123 {
 124         int n;
 125         u16 len;
 126         u32 rem;
 127         char *buf;
 128         struct tlv_desc *tlv;
 129         va_list args;
 130
 131         rem = tipc_skb_tailroom(skb);
 132
 133         tlv = (struct tlv_desc *)skb->data;
 134         len = TLV_GET_LEN(tlv);
 135         buf = TLV_DATA(tlv) + len;
 136
 137         va_start(args, fmt);
 138         n = vscnprintf(buf, rem, fmt, args);
 139         va_end(args);
 140
 141         TLV_SET_LEN(tlv, n + len);
 142         skb_put(skb, n);
 143
 144         return n;
 145 }
 146
 147 static struct sk_buff *tipc_tlv_alloc(int size)
 148 {
 149         int hdr_len;
 150         struct sk_buff *buf;
 151
 152         size = TLV_SPACE(size);
 153         hdr_len = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN);
 154
 155         buf = alloc_skb(hdr_len + size, GFP_KERNEL);
 156         if (!buf)
 157                 return NULL;
 158
 159         skb_reserve(buf, hdr_len);
 160
 161         return buf;
 162 }
 163
 164 static struct sk_buff *tipc_get_err_tlv(char *str)
 165 {
 166         int str_len = strlen(str) + 1;
 167         struct sk_buff *buf;
 168
 169         buf = tipc_tlv_alloc(TLV_SPACE(str_len));
 170         if (buf)
 171                 tipc_add_tlv(buf, TIPC_TLV_ERROR_STRING, str, str_len);
 172
 173         return buf;
 174 }
 175
 176 static inline bool string_is_valid(char *s, int len)
 177 {
 178         return memchr(s, '\0', len) ? true : false;
 179 }
 180
 181 static int __tipc_nl_compat_dumpit(struct tipc_nl_compat_cmd_dump *cmd,
 182                                    struct tipc_nl_compat_msg *msg,
 183                                    struct sk_buff *arg)
 184 {
 185         struct genl_dumpit_info info;
 186         int len = 0;
 187         int err;
 188         struct sk_buff *buf;
 189         struct nlmsghdr *nlmsg;
 190         struct netlink_callback cb;
 191         struct nlattr **attrbuf;
 192
 193         memset(&cb, 0, sizeof(cb));
 194         cb.nlh = (struct nlmsghdr *)arg->data;
 195         cb.skb = arg;
 196         cb.data = &info;
 197
 198         buf = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 199         if (!buf)
 200                 return -ENOMEM;
 201
 202         buf->sk = msg->dst_sk;
 203         if (__tipc_dump_start(&cb, msg->net)) {
 204                 kfree_skb(buf);
 205                 return -ENOMEM;
 206         }
 207
 208         attrbuf = kcalloc(tipc_genl_family.maxattr + 1,
 209                           sizeof(struct nlattr *), GFP_KERNEL);
 210         if (!attrbuf) {
 211                 err = -ENOMEM;
 212                 goto err_out;
 213         }
 214
 215         info.attrs = attrbuf;
 216
 217         if (nlmsg_len(cb.nlh) > 0) {
 218                 err = nlmsg_parse_deprecated(cb.nlh, GENL_HDRLEN, attrbuf,
 219                                              tipc_genl_family.maxattr,
 220                                              tipc_genl_family.policy, NULL);
 221                 if (err)
 222                         goto err_out;
 223         }
 224         do {
 225                 int rem;
 226
 227                 len = (*cmd->dumpit)(buf, &cb);
 228
 229                 nlmsg_for_each_msg(nlmsg, nlmsg_hdr(buf), len, rem) {
 230                         err = nlmsg_parse_deprecated(nlmsg, GENL_HDRLEN,
 231                                                      attrbuf,
 232                                                      tipc_genl_family.maxattr,
 233                                                      tipc_genl_family.policy,
 234                                                      NULL);
 235                         if (err)
 236                                 goto err_out;
 237
 238                         err = (*cmd->format)(msg, attrbuf);
 239                         if (err)
 240                                 goto err_out;
 241
 242                         if (tipc_skb_tailroom(msg->rep) <= 1) {
 243                                 err = -EMSGSIZE;
 244                                 goto err_out;
 245                         }
 246                 }
 247
 248                 skb_reset_tail_pointer(buf);
 249                 buf->len = 0;
 250
 251         } while (len);
 252
 253         err = 0;
 254
 255 err_out:
 256         kfree(attrbuf);
 257         tipc_dump_done(&cb);
 258         kfree_skb(buf);
 259
 260         if (err == -EMSGSIZE) {
 261                 /* The legacy API only considered messages filling
 262                  * "ULTRA_STRING_MAX_LEN" to be truncated.
 263                  */
 264                 if ((TIPC_SKB_MAX - msg->rep->len) <= 1) {
 265                         char *tail = skb_tail_pointer(msg->rep);
 266
 267                         if (*tail != '\0')
 268                                 sprintf(tail - sizeof(REPLY_TRUNCATED) - 1,
 269                                         REPLY_TRUNCATED);
 270                 }
 271
 272                 return 0;
 273         }
 274
 275         return err;
 276 }
 277
 278 static int tipc_nl_compat_dumpit(struct tipc_nl_compat_cmd_dump *cmd,
 279                                  struct tipc_nl_compat_msg *msg)
 280 {
 281         struct nlmsghdr *nlh;
 282         struct sk_buff *arg;
 283         int err;
 284
 285         if (msg->req_type && (!msg->req_size ||
 286                               !TLV_CHECK_TYPE(msg->req, msg->req_type)))
 287                 return -EINVAL;
 288
 289         msg->rep = tipc_tlv_alloc(msg->rep_size);
 290         if (!msg->rep)
 291                 return -ENOMEM;
 292
 293         if (msg->rep_type)
 294                 tipc_tlv_init(msg->rep, msg->rep_type);
 295
 296         if (cmd->header) {
 297                 err = (*cmd->header)(msg);
 298                 if (err) {
 299                         kfree_skb(msg->rep);
 300                         msg->rep = NULL;
 301                         return err;
 302                 }
 303         }
 304
 305         arg = nlmsg_new(0, GFP_KERNEL);
 306         if (!arg) {
 307                 kfree_skb(msg->rep);
 308                 msg->rep = NULL;
 309                 return -ENOMEM;
 310         }
 311
 312         nlh = nlmsg_put(arg, 0, 0, tipc_genl_family.id, 0, NLM_F_MULTI);
 313         if (!nlh) {
 314                 kfree_skb(arg);
 315                 kfree_skb(msg->rep);
 316                 msg->rep = NULL;
 317                 return -EMSGSIZE;
 318         }
 319         nlmsg_end(arg, nlh);
 320
 321         err = __tipc_nl_compat_dumpit(cmd, msg, arg);
 322         if (err) {
 323                 kfree_skb(msg->rep);
 324                 msg->rep = NULL;
 325         }
 326         kfree_skb(arg);
 327
 328         return err;
 329 }
 330
 331 static int __tipc_nl_compat_doit(struct tipc_nl_compat_cmd_doit *cmd,
 332                                  struct tipc_nl_compat_msg *msg)
 333 {
 334         int err;
 335         struct sk_buff *doit_buf;
 336         struct sk_buff *trans_buf;
 337         struct nlattr **attrbuf;
 338         struct genl_info info;
 339
 340         trans_buf = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 341         if (!trans_buf)
 342                 return -ENOMEM;
 343
 344         attrbuf = kmalloc_array(tipc_genl_family.maxattr + 1,
 345                                 sizeof(struct nlattr *),
 346                                 GFP_KERNEL);
 347         if (!attrbuf) {
 348                 err = -ENOMEM;
 349                 goto trans_out;
 350         }
 351
 352         doit_buf = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 353         if (!doit_buf) {
 354                 err = -ENOMEM;
 355                 goto attrbuf_out;
 356         }
 357
 358         memset(&info, 0, sizeof(info));
 359         info.attrs = attrbuf;
 360
 361         rtnl_lock();
 362         err = (*cmd->transcode)(cmd, trans_buf, msg);
 363         if (err)
 364                 goto doit_out;
 365
 366         err = nla_parse_deprecated(attrbuf, tipc_genl_family.maxattr,
 367                                    (const struct nlattr *)trans_buf->data,
 368                                    trans_buf->len, NULL, NULL);
 369         if (err)
 370                 goto doit_out;
 371
 372         doit_buf->sk = msg->dst_sk;
 373
 374         err = (*cmd->doit)(doit_buf, &info);
 375 doit_out:
 376         rtnl_unlock();
 377
 378         kfree_skb(doit_buf);
 379 attrbuf_out:
 380         kfree(attrbuf);
 381 trans_out:
 382         kfree_skb(trans_buf);
 383
 384         return err;
 385 }
 386
 387 static int tipc_nl_compat_doit(struct tipc_nl_compat_cmd_doit *cmd,
 388                                struct tipc_nl_compat_msg *msg)
 389 {
 390         int err;
 391
 392         if (msg->req_type && (!msg->req_size ||
 393                               !TLV_CHECK_TYPE(msg->req, msg->req_type)))
 394                 return -EINVAL;
 395
 396         err = __tipc_nl_compat_doit(cmd, msg);
 397         if (err)
 398                 return err;
 399
 400         /* The legacy API considered an empty message a success message */
 401         msg->rep = tipc_tlv_alloc(0);
 402         if (!msg->rep)
 403                 return -ENOMEM;
 404
 405         return 0;
 406 }
 407
 408 static int tipc_nl_compat_bearer_dump(struct tipc_nl_compat_msg *msg,
 409                                       struct nlattr **attrs)
 410 {
 411         struct nlattr *bearer[TIPC_NLA_BEARER_MAX + 1];
 412         int err;
 413
 414         if (!attrs[TIPC_NLA_BEARER])
 415                 return -EINVAL;
 416
 417         err = nla_parse_nested_deprecated(bearer, TIPC_NLA_BEARER_MAX,
 418                                           attrs[TIPC_NLA_BEARER], NULL, NULL);
 419         if (err)
 420                 return err;
 421
 422         return tipc_add_tlv(msg->rep, TIPC_TLV_BEARER_NAME,
 423                             nla_data(bearer[TIPC_NLA_BEARER_NAME]),
 424                             nla_len(bearer[TIPC_NLA_BEARER_NAME]));
 425 }
 426
 427 static int tipc_nl_compat_bearer_enable(struct tipc_nl_compat_cmd_doit *cmd,
 428                                         struct sk_buff *skb,
 429                                         struct tipc_nl_compat_msg *msg)
 430 {
 431         struct nlattr *prop;
 432         struct nlattr *bearer;
 433         struct tipc_bearer_config *b;
 434         int len;
 435
 436         b = (struct tipc_bearer_config *)TLV_DATA(msg->req);
 437
 438         bearer = nla_nest_start_noflag(skb, TIPC_NLA_BEARER);
 439         if (!bearer)
 440                 return -EMSGSIZE;
 441
 442         len = TLV_GET_DATA_LEN(msg->req);
 443         len -= offsetof(struct tipc_bearer_config, name);
 444         if (len <= 0)
 445                 return -EINVAL;
 446
 447         len = min_t(int, len, TIPC_MAX_BEARER_NAME);
 448         if (!string_is_valid(b->name, len))
 449                 return -EINVAL;
 450
 451         if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, b->name))
 452                 return -EMSGSIZE;
 453
 454         if (nla_put_u32(skb, TIPC_NLA_BEARER_DOMAIN, ntohl(b->disc_domain)))
 455                 return -EMSGSIZE;
 456
 457         if (ntohl(b->priority) <= TIPC_MAX_LINK_PRI) {
 458                 prop = nla_nest_start_noflag(skb, TIPC_NLA_BEARER_PROP);
 459                 if (!prop)
 460                         return -EMSGSIZE;
 461                 if (nla_put_u32(skb, TIPC_NLA_PROP_PRIO, ntohl(b->priority)))
 462                         return -EMSGSIZE;
 463                 nla_nest_end(skb, prop);
 464         }
 465         nla_nest_end(skb, bearer);
 466
 467         return 0;
 468 }
 469
 470 static int tipc_nl_compat_bearer_disable(struct tipc_nl_compat_cmd_doit *cmd,
 471                                          struct sk_buff *skb,
 472                                          struct tipc_nl_compat_msg *msg)
 473 {
 474         char *name;
 475         struct nlattr *bearer;
 476         int len;
 477
 478         name = (char *)TLV_DATA(msg->req);
 479
 480         bearer = nla_nest_start_noflag(skb, TIPC_NLA_BEARER);
 481         if (!bearer)
 482                 return -EMSGSIZE;
 483
 484         len = TLV_GET_DATA_LEN(msg->req);
 485         if (len <= 0)
 486                 return -EINVAL;
 487
 488         len = min_t(int, len, TIPC_MAX_BEARER_NAME);
 489         if (!string_is_valid(name, len))
 490                 return -EINVAL;
 491
 492         if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, name))
 493                 return -EMSGSIZE;
 494
 495         nla_nest_end(skb, bearer);
 496
 497         return 0;
 498 }
 499
 500 static inline u32 perc(u32 count, u32 total)
 501 {
 502         return (count * 100 + (total / 2)) / total;
 503 }
 504
 505 static void __fill_bc_link_stat(struct tipc_nl_compat_msg *msg,
 506                                 struct nlattr *prop[], struct nlattr *stats[])
 507 {
 508         tipc_tlv_sprintf(msg->rep, "  Window:%u packets\n",
 509                          nla_get_u32(prop[TIPC_NLA_PROP_WIN]));
 510
 511         tipc_tlv_sprintf(msg->rep,
 512                          "  RX packets:%u fragments:%u/%u bundles:%u/%u\n",
 513                          nla_get_u32(stats[TIPC_NLA_STATS_RX_INFO]),
 514                          nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTS]),
 515                          nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTED]),
 516                          nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLES]),
 517                          nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLED]));
 518
 519         tipc_tlv_sprintf(msg->rep,
 520                          "  TX packets:%u fragments:%u/%u bundles:%u/%u\n",
 521                          nla_get_u32(stats[TIPC_NLA_STATS_TX_INFO]),
 522                          nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTS]),
 523                          nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTED]),
 524                          nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLES]),
 525                          nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLED]));
 526
 527         tipc_tlv_sprintf(msg->rep, "  RX naks:%u defs:%u dups:%u\n",
 528                          nla_get_u32(stats[TIPC_NLA_STATS_RX_NACKS]),
 529                          nla_get_u32(stats[TIPC_NLA_STATS_RX_DEFERRED]),
 530                          nla_get_u32(stats[TIPC_NLA_STATS_DUPLICATES]));
 531
 532         tipc_tlv_sprintf(msg->rep, "  TX naks:%u acks:%u dups:%u\n",
 533                          nla_get_u32(stats[TIPC_NLA_STATS_TX_NACKS]),
 534                          nla_get_u32(stats[TIPC_NLA_STATS_TX_ACKS]),
 535                          nla_get_u32(stats[TIPC_NLA_STATS_RETRANSMITTED]));
 536
 537         tipc_tlv_sprintf(msg->rep,
 538                          "  Congestion link:%u  Send queue max:%u avg:%u",
 539                          nla_get_u32(stats[TIPC_NLA_STATS_LINK_CONGS]),
 540                          nla_get_u32(stats[TIPC_NLA_STATS_MAX_QUEUE]),
 541                          nla_get_u32(stats[TIPC_NLA_STATS_AVG_QUEUE]));
 542 }
 543
 544 static int tipc_nl_compat_link_stat_dump(struct tipc_nl_compat_msg *msg,
 545                                          struct nlattr **attrs)
 546 {
 547         char *name;
 548         struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
 549         struct nlattr *prop[TIPC_NLA_PROP_MAX + 1];
 550         struct nlattr *stats[TIPC_NLA_STATS_MAX + 1];
 551         int err;
 552         int len;
 553
 554         if (!attrs[TIPC_NLA_LINK])
 555                 return -EINVAL;
 556
 557         err = nla_parse_nested_deprecated(link, TIPC_NLA_LINK_MAX,
 558                                           attrs[TIPC_NLA_LINK], NULL, NULL);
 559         if (err)
 560                 return err;
 561
 562         if (!link[TIPC_NLA_LINK_PROP])
 563                 return -EINVAL;
 564
 565         err = nla_parse_nested_deprecated(prop, TIPC_NLA_PROP_MAX,
 566                                           link[TIPC_NLA_LINK_PROP], NULL,
 567                                           NULL);
 568         if (err)
 569                 return err;
 570
 571         if (!link[TIPC_NLA_LINK_STATS])
 572                 return -EINVAL;
 573
 574         err = nla_parse_nested_deprecated(stats, TIPC_NLA_STATS_MAX,
 575                                           link[TIPC_NLA_LINK_STATS], NULL,
 576                                           NULL);
 577         if (err)
 578                 return err;
 579
 580         name = (char *)TLV_DATA(msg->req);
 581
 582         len = TLV_GET_DATA_LEN(msg->req);
 583         if (len <= 0)
 584                 return -EINVAL;
 585
 586         len = min_t(int, len, TIPC_MAX_LINK_NAME);
 587         if (!string_is_valid(name, len))
 588                 return -EINVAL;
 589
 590         if (strcmp(name, nla_data(link[TIPC_NLA_LINK_NAME])) != 0)
 591                 return 0;
 592
 593         tipc_tlv_sprintf(msg->rep, "\nLink <%s>\n",
 594                          (char *)nla_data(link[TIPC_NLA_LINK_NAME]));
 595
 596         if (link[TIPC_NLA_LINK_BROADCAST]) {
 597                 __fill_bc_link_stat(msg, prop, stats);
 598                 return 0;
 599         }
 600
 601         if (link[TIPC_NLA_LINK_ACTIVE])
 602                 tipc_tlv_sprintf(msg->rep, "  ACTIVE");
 603         else if (link[TIPC_NLA_LINK_UP])
 604                 tipc_tlv_sprintf(msg->rep, "  STANDBY");
 605         else
 606                 tipc_tlv_sprintf(msg->rep, "  DEFUNCT");
 607
 608         tipc_tlv_sprintf(msg->rep, "  MTU:%u  Priority:%u",
 609                          nla_get_u32(link[TIPC_NLA_LINK_MTU]),
 610                          nla_get_u32(prop[TIPC_NLA_PROP_PRIO]));
 611
 612         tipc_tlv_sprintf(msg->rep, "  Tolerance:%u ms  Window:%u packets\n",
 613                          nla_get_u32(prop[TIPC_NLA_PROP_TOL]),
 614                          nla_get_u32(prop[TIPC_NLA_PROP_WIN]));
 615
 616         tipc_tlv_sprintf(msg->rep,
 617                          "  RX packets:%u fragments:%u/%u bundles:%u/%u\n",
 618                          nla_get_u32(link[TIPC_NLA_LINK_RX]) -
 619                          nla_get_u32(stats[TIPC_NLA_STATS_RX_INFO]),
 620                          nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTS]),
 621                          nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTED]),
 622                          nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLES]),
 623                          nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLED]));
 624
 625         tipc_tlv_sprintf(msg->rep,
 626                          "  TX packets:%u fragments:%u/%u bundles:%u/%u\n",
 627                          nla_get_u32(link[TIPC_NLA_LINK_TX]) -
 628                          nla_get_u32(stats[TIPC_NLA_STATS_TX_INFO]),
 629                          nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTS]),
 630                          nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTED]),
 631                          nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLES]),
 632                          nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLED]));
 633
 634         tipc_tlv_sprintf(msg->rep,
 635                          "  TX profile sample:%u packets  average:%u octets\n",
 636                          nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_CNT]),
 637                          nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_TOT]) /
 638                          nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT]));
 639
 640         tipc_tlv_sprintf(msg->rep,
 641                          "  0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% ",
 642                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P0]),
 643                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 644                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P1]),
 645                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 646                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P2]),
 647                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 648                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P3]),
 649                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])));
 650
 651         tipc_tlv_sprintf(msg->rep, "-16384:%u%% -32768:%u%% -66000:%u%%\n",
 652                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P4]),
 653                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 654                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P5]),
 655                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
 656                          perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P6]),
 657                               nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])));
 658
 659         tipc_tlv_sprintf(msg->rep,
 660                          "  RX states:%u probes:%u naks:%u defs:%u dups:%u\n",
 661                          nla_get_u32(stats[TIPC_NLA_STATS_RX_STATES]),
 662                          nla_get_u32(stats[TIPC_NLA_STATS_RX_PROBES]),
 663                          nla_get_u32(stats[TIPC_NLA_STATS_RX_NACKS]),
 664                          nla_get_u32(stats[TIPC_NLA_STATS_RX_DEFERRED]),
 665                          nla_get_u32(stats[TIPC_NLA_STATS_DUPLICATES]));
 666
 667         tipc_tlv_sprintf(msg->rep,
 668                          "  TX states:%u probes:%u naks:%u acks:%u dups:%u\n",
 669                          nla_get_u32(stats[TIPC_NLA_STATS_TX_STATES]),
 670                          nla_get_u32(stats[TIPC_NLA_STATS_TX_PROBES]),
 671                          nla_get_u32(stats[TIPC_NLA_STATS_TX_NACKS]),
 672                          nla_get_u32(stats[TIPC_NLA_STATS_TX_ACKS]),
 673                          nla_get_u32(stats[TIPC_NLA_STATS_RETRANSMITTED]));
 674
 675         tipc_tlv_sprintf(msg->rep,
 676                          "  Congestion link:%u  Send queue max:%u avg:%u",
 677                          nla_get_u32(stats[TIPC_NLA_STATS_LINK_CONGS]),
 678                          nla_get_u32(stats[TIPC_NLA_STATS_MAX_QUEUE]),
 679                          nla_get_u32(stats[TIPC_NLA_STATS_AVG_QUEUE]));
 680
 681         return 0;
 682 }
 683
 684 static int tipc_nl_compat_link_dump(struct tipc_nl_compat_msg *msg,
 685                                     struct nlattr **attrs)
 686 {
 687         struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
 688         struct tipc_link_info link_info;
 689         int err;
 690
 691         if (!attrs[TIPC_NLA_LINK])
 692                 return -EINVAL;
 693
 694         err = nla_parse_nested_deprecated(link, TIPC_NLA_LINK_MAX,
 695                                           attrs[TIPC_NLA_LINK], NULL, NULL);
 696         if (err)
 697                 return err;
 698
 699         link_info.dest = htonl(nla_get_flag(link[TIPC_NLA_LINK_DEST]));
 700         link_info.up = htonl(nla_get_flag(link[TIPC_NLA_LINK_UP]));
 701         nla_strscpy(link_info.str, link[TIPC_NLA_LINK_NAME],
 702                     TIPC_MAX_LINK_NAME);
 703
 704         return tipc_add_tlv(msg->rep, TIPC_TLV_LINK_INFO,
 705                             &link_info, sizeof(link_info));
 706 }
 707
 708 static int __tipc_add_link_prop(struct sk_buff *skb,
 709                                 struct tipc_nl_compat_msg *msg,
 710                                 struct tipc_link_config *lc)
 711 {
 712         switch (msg->cmd) {
 713         case TIPC_CMD_SET_LINK_PRI:
 714                 return nla_put_u32(skb, TIPC_NLA_PROP_PRIO, ntohl(lc->value));
 715         case TIPC_CMD_SET_LINK_TOL:
 716                 return nla_put_u32(skb, TIPC_NLA_PROP_TOL, ntohl(lc->value));
 717         case TIPC_CMD_SET_LINK_WINDOW:
 718                 return nla_put_u32(skb, TIPC_NLA_PROP_WIN, ntohl(lc->value));
 719         }
 720
 721         return -EINVAL;
 722 }
 723
 724 static int tipc_nl_compat_media_set(struct sk_buff *skb,
 725                                     struct tipc_nl_compat_msg *msg)
 726 {
 727         struct nlattr *prop;
 728         struct nlattr *media;
 729         struct tipc_link_config *lc;
 730
 731         lc = (struct tipc_link_config *)TLV_DATA(msg->req);
 732
 733         media = nla_nest_start_noflag(skb, TIPC_NLA_MEDIA);
 734         if (!media)
 735                 return -EMSGSIZE;
 736
 737         if (nla_put_string(skb, TIPC_NLA_MEDIA_NAME, lc->name))
 738                 return -EMSGSIZE;
 739
 740         prop = nla_nest_start_noflag(skb, TIPC_NLA_MEDIA_PROP);
 741         if (!prop)
 742                 return -EMSGSIZE;
 743
 744         __tipc_add_link_prop(skb, msg, lc);
 745         nla_nest_end(skb, prop);
 746         nla_nest_end(skb, media);
 747
 748         return 0;
 749 }
 750
 751 static int tipc_nl_compat_bearer_set(struct sk_buff *skb,
 752                                      struct tipc_nl_compat_msg *msg)
 753 {
 754         struct nlattr *prop;
 755         struct nlattr *bearer;
 756         struct tipc_link_config *lc;
 757
 758         lc = (struct tipc_link_config *)TLV_DATA(msg->req);
 759
 760         bearer = nla_nest_start_noflag(skb, TIPC_NLA_BEARER);
 761         if (!bearer)
 762                 return -EMSGSIZE;
 763
 764         if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, lc->name))
 765                 return -EMSGSIZE;
 766
 767         prop = nla_nest_start_noflag(skb, TIPC_NLA_BEARER_PROP);
 768         if (!prop)
 769                 return -EMSGSIZE;
 770
 771         __tipc_add_link_prop(skb, msg, lc);
 772         nla_nest_end(skb, prop);
 773         nla_nest_end(skb, bearer);
 774
 775         return 0;
 776 }
 777
 778 static int __tipc_nl_compat_link_set(struct sk_buff *skb,
 779                                      struct tipc_nl_compat_msg *msg)
 780 {
 781         struct nlattr *prop;
 782         struct nlattr *link;
 783         struct tipc_link_config *lc;
 784
 785         lc = (struct tipc_link_config *)TLV_DATA(msg->req);
 786
 787         link = nla_nest_start_noflag(skb, TIPC_NLA_LINK);
 788         if (!link)
 789                 return -EMSGSIZE;
 790
 791         if (nla_put_string(skb, TIPC_NLA_LINK_NAME, lc->name))
 792                 return -EMSGSIZE;
 793
 794         prop = nla_nest_start_noflag(skb, TIPC_NLA_LINK_PROP);
 795         if (!prop)
 796                 return -EMSGSIZE;
 797
 798         __tipc_add_link_prop(skb, msg, lc);
 799         nla_nest_end(skb, prop);
 800         nla_nest_end(skb, link);
 801
 802         return 0;
 803 }
 804
 805 static int tipc_nl_compat_link_set(struct tipc_nl_compat_cmd_doit *cmd,
 806                                    struct sk_buff *skb,
 807                                    struct tipc_nl_compat_msg *msg)
 808 {
 809         struct tipc_link_config *lc;
 810         struct tipc_bearer *bearer;
 811         struct tipc_media *media;
 812         int len;
 813
 814         lc = (struct tipc_link_config *)TLV_DATA(msg->req);
 815
 816         len = TLV_GET_DATA_LEN(msg->req);
 817         len -= offsetof(struct tipc_link_config, name);
 818         if (len <= 0)
 819                 return -EINVAL;
 820
 821         len = min_t(int, len, TIPC_MAX_LINK_NAME);
 822         if (!string_is_valid(lc->name, len))
 823                 return -EINVAL;
 824
 825         media = tipc_media_find(lc->name);
 826         if (media) {
 827                 cmd->doit = &__tipc_nl_media_set;
 828                 return tipc_nl_compat_media_set(skb, msg);
 829         }
 830
 831         bearer = tipc_bearer_find(msg->net, lc->name);
 832         if (bearer) {
 833                 cmd->doit = &__tipc_nl_bearer_set;
 834                 return tipc_nl_compat_bearer_set(skb, msg);
 835         }
 836
 837         return __tipc_nl_compat_link_set(skb, msg);
 838 }
 839
 840 static int tipc_nl_compat_link_reset_stats(struct tipc_nl_compat_cmd_doit *cmd,
 841                                            struct sk_buff *skb,
 842                                            struct tipc_nl_compat_msg *msg)
 843 {
 844         char *name;
 845         struct nlattr *link;
 846         int len;
 847
 848         name = (char *)TLV_DATA(msg->req);
 849
 850         link = nla_nest_start_noflag(skb, TIPC_NLA_LINK);
 851         if (!link)
 852                 return -EMSGSIZE;
 853
 854         len = TLV_GET_DATA_LEN(msg->req);
 855         if (len <= 0)
 856                 return -EINVAL;
 857
 858         len = min_t(int, len, TIPC_MAX_LINK_NAME);
 859         if (!string_is_valid(name, len))
 860                 return -EINVAL;
 861
 862         if (nla_put_string(skb, TIPC_NLA_LINK_NAME, name))
 863                 return -EMSGSIZE;
 864
 865         nla_nest_end(skb, link);
 866
 867         return 0;
 868 }
 869
 870 static int tipc_nl_compat_name_table_dump_header(struct tipc_nl_compat_msg *msg)
 871 {
 872         int i;
 873         u32 depth;
 874         struct tipc_name_table_query *ntq;
 875         static const char * const header[] = {
 876                 "Type       ",
 877                 "Lower      Upper      ",
 878                 "Port Identity              ",
 879                 "Publication Scope"
 880         };
 881
 882         ntq = (struct tipc_name_table_query *)TLV_DATA(msg->req);
 883         if (TLV_GET_DATA_LEN(msg->req) < (int)sizeof(struct tipc_name_table_query))
 884                 return -EINVAL;
 885
 886         depth = ntohl(ntq->depth);
 887
 888         if (depth > 4)
 889                 depth = 4;
 890         for (i = 0; i < depth; i++)
 891                 tipc_tlv_sprintf(msg->rep, header[i]);
 892         tipc_tlv_sprintf(msg->rep, "\n");
 893
 894         return 0;
 895 }
 896
 897 static int tipc_nl_compat_name_table_dump(struct tipc_nl_compat_msg *msg,
 898                                           struct nlattr **attrs)
 899 {
 900         char port_str[27];
 901         struct tipc_name_table_query *ntq;
 902         struct nlattr *nt[TIPC_NLA_NAME_TABLE_MAX + 1];
 903         struct nlattr *publ[TIPC_NLA_PUBL_MAX + 1];
 904         u32 node, depth, type, lowbound, upbound;
 905         static const char * const scope_str[] = {"", " zone", " cluster",
 906                                                  " node"};
 907         int err;
 908
 909         if (!attrs[TIPC_NLA_NAME_TABLE])
 910                 return -EINVAL;
 911
 912         err = nla_parse_nested_deprecated(nt, TIPC_NLA_NAME_TABLE_MAX,
 913                                           attrs[TIPC_NLA_NAME_TABLE], NULL,
 914                                           NULL);
 915         if (err)
 916                 return err;
 917
 918         if (!nt[TIPC_NLA_NAME_TABLE_PUBL])
 919                 return -EINVAL;
 920
 921         err = nla_parse_nested_deprecated(publ, TIPC_NLA_PUBL_MAX,
 922                                           nt[TIPC_NLA_NAME_TABLE_PUBL], NULL,
 923                                           NULL);
 924         if (err)
 925                 return err;
 926
 927         ntq = (struct tipc_name_table_query *)TLV_DATA(msg->req);
 928
 929         depth = ntohl(ntq->depth);
 930         type = ntohl(ntq->type);
 931         lowbound = ntohl(ntq->lowbound);
 932         upbound = ntohl(ntq->upbound);
 933
 934         if (!(depth & TIPC_NTQ_ALLTYPES) &&
 935             (type != nla_get_u32(publ[TIPC_NLA_PUBL_TYPE])))
 936                 return 0;
 937         if (lowbound && (lowbound > nla_get_u32(publ[TIPC_NLA_PUBL_UPPER])))
 938                 return 0;
 939         if (upbound && (upbound < nla_get_u32(publ[TIPC_NLA_PUBL_LOWER])))
 940                 return 0;
 941
 942         tipc_tlv_sprintf(msg->rep, "%-10u ",
 943                          nla_get_u32(publ[TIPC_NLA_PUBL_TYPE]));
 944
 945         if (depth == 1)
 946                 goto out;
 947
 948         tipc_tlv_sprintf(msg->rep, "%-10u %-10u ",
 949                          nla_get_u32(publ[TIPC_NLA_PUBL_LOWER]),
 950                          nla_get_u32(publ[TIPC_NLA_PUBL_UPPER]));
 951
 952         if (depth == 2)
 953                 goto out;
 954
 955         node = nla_get_u32(publ[TIPC_NLA_PUBL_NODE]);
 956         sprintf(port_str, "<%u.%u.%u:%u>", tipc_zone(node), tipc_cluster(node),
 957                 tipc_node(node), nla_get_u32(publ[TIPC_NLA_PUBL_REF]));
 958         tipc_tlv_sprintf(msg->rep, "%-26s ", port_str);
 959
 960         if (depth == 3)
 961                 goto out;
 962
 963         tipc_tlv_sprintf(msg->rep, "%-10u %s",
 964                          nla_get_u32(publ[TIPC_NLA_PUBL_KEY]),
 965                          scope_str[nla_get_u32(publ[TIPC_NLA_PUBL_SCOPE])]);
 966 out:
 967         tipc_tlv_sprintf(msg->rep, "\n");
 968
 969         return 0;
 970 }
 971
 972 static int __tipc_nl_compat_publ_dump(struct tipc_nl_compat_msg *msg,
 973                                       struct nlattr **attrs)
 974 {
 975         u32 type, lower, upper;
 976         struct nlattr *publ[TIPC_NLA_PUBL_MAX + 1];
 977         int err;
 978
 979         if (!attrs[TIPC_NLA_PUBL])
 980                 return -EINVAL;
 981
 982         err = nla_parse_nested_deprecated(publ, TIPC_NLA_PUBL_MAX,
 983                                           attrs[TIPC_NLA_PUBL], NULL, NULL);
 984         if (err)
 985                 return err;
 986
 987         type = nla_get_u32(publ[TIPC_NLA_PUBL_TYPE]);
 988         lower = nla_get_u32(publ[TIPC_NLA_PUBL_LOWER]);
 989         upper = nla_get_u32(publ[TIPC_NLA_PUBL_UPPER]);
 990
 991         if (lower == upper)
 992                 tipc_tlv_sprintf(msg->rep, " {%u,%u}", type, lower);
 993         else
 994                 tipc_tlv_sprintf(msg->rep, " {%u,%u,%u}", type, lower, upper);
 995
 996         return 0;
 997 }
 998
 999 static int tipc_nl_compat_publ_dump(struct tipc_nl_compat_msg *msg, u32 sock)
1000 {
1001         int err;
1002         void *hdr;
1003         struct nlattr *nest;
1004         struct sk_buff *args;
1005         struct tipc_nl_compat_cmd_dump dump;
1006
1007         args = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1008         if (!args)
1009                 return -ENOMEM;
1010
1011         hdr = genlmsg_put(args, 0, 0, &tipc_genl_family, NLM_F_MULTI,
1012                           TIPC_NL_PUBL_GET);
1013         if (!hdr) {
1014                 kfree_skb(args);
1015                 return -EMSGSIZE;
1016         }
1017
1018         nest = nla_nest_start_noflag(args, TIPC_NLA_SOCK);
1019         if (!nest) {
1020                 kfree_skb(args);
1021                 return -EMSGSIZE;
1022         }
1023
1024         if (nla_put_u32(args, TIPC_NLA_SOCK_REF, sock)) {
1025                 kfree_skb(args);
1026                 return -EMSGSIZE;
1027         }
1028
1029         nla_nest_end(args, nest);
1030         genlmsg_end(args, hdr);
1031
1032         dump.dumpit = tipc_nl_publ_dump;
1033         dump.format = __tipc_nl_compat_publ_dump;
1034
1035         err = __tipc_nl_compat_dumpit(&dump, msg, args);
1036
1037         kfree_skb(args);
1038
1039         return err;
1040 }
1041
1042 static int tipc_nl_compat_sk_dump(struct tipc_nl_compat_msg *msg,
1043                                   struct nlattr **attrs)
1044 {
1045         int err;
1046         u32 sock_ref;
1047         struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
1048
1049         if (!attrs[TIPC_NLA_SOCK])
1050                 return -EINVAL;
1051
1052         err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX,
1053                                           attrs[TIPC_NLA_SOCK], NULL, NULL);
1054         if (err)
1055                 return err;
1056
1057         sock_ref = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
1058         tipc_tlv_sprintf(msg->rep, "%u:", sock_ref);
1059
1060         if (sock[TIPC_NLA_SOCK_CON]) {
1061                 u32 node;
1062                 struct nlattr *con[TIPC_NLA_CON_MAX + 1];
1063
1064                 err = nla_parse_nested_deprecated(con, TIPC_NLA_CON_MAX,
1065                                                   sock[TIPC_NLA_SOCK_CON],
1066                                                   NULL, NULL);
1067
1068                 if (err)
1069                         return err;
1070
1071                 node = nla_get_u32(con[TIPC_NLA_CON_NODE]);
1072                 tipc_tlv_sprintf(msg->rep, "  connected to <%u.%u.%u:%u>",
1073                                  tipc_zone(node),
1074                                  tipc_cluster(node),
1075                                  tipc_node(node),
1076                                  nla_get_u32(con[TIPC_NLA_CON_SOCK]));
1077
1078                 if (con[TIPC_NLA_CON_FLAG])
1079                         tipc_tlv_sprintf(msg->rep, " via {%u,%u}\n",
1080                                          nla_get_u32(con[TIPC_NLA_CON_TYPE]),
1081                                          nla_get_u32(con[TIPC_NLA_CON_INST]));
1082                 else
1083                         tipc_tlv_sprintf(msg->rep, "\n");
1084         } else if (sock[TIPC_NLA_SOCK_HAS_PUBL]) {
1085                 tipc_tlv_sprintf(msg->rep, " bound to");
1086
1087                 err = tipc_nl_compat_publ_dump(msg, sock_ref);
1088                 if (err)
1089                         return err;
1090         }
1091         tipc_tlv_sprintf(msg->rep, "\n");
1092
1093         return 0;
1094 }
1095
1096 static int tipc_nl_compat_media_dump(struct tipc_nl_compat_msg *msg,
1097                                      struct nlattr **attrs)
1098 {
1099         struct nlattr *media[TIPC_NLA_MEDIA_MAX + 1];
1100         int err;
1101
1102         if (!attrs[TIPC_NLA_MEDIA])
1103                 return -EINVAL;
1104
1105         err = nla_parse_nested_deprecated(media, TIPC_NLA_MEDIA_MAX,
1106                                           attrs[TIPC_NLA_MEDIA], NULL, NULL);
1107         if (err)
1108                 return err;
1109
1110         return tipc_add_tlv(msg->rep, TIPC_TLV_MEDIA_NAME,
1111                             nla_data(media[TIPC_NLA_MEDIA_NAME]),
1112                             nla_len(media[TIPC_NLA_MEDIA_NAME]));
1113 }
1114
1115 static int tipc_nl_compat_node_dump(struct tipc_nl_compat_msg *msg,
1116                                     struct nlattr **attrs)
1117 {
1118         struct tipc_node_info node_info;
1119         struct nlattr *node[TIPC_NLA_NODE_MAX + 1];
1120         int err;
1121
1122         if (!attrs[TIPC_NLA_NODE])
1123                 return -EINVAL;
1124
1125         err = nla_parse_nested_deprecated(node, TIPC_NLA_NODE_MAX,
1126                                           attrs[TIPC_NLA_NODE], NULL, NULL);
1127         if (err)
1128                 return err;
1129
1130         node_info.addr = htonl(nla_get_u32(node[TIPC_NLA_NODE_ADDR]));
1131         node_info.up = htonl(nla_get_flag(node[TIPC_NLA_NODE_UP]));
1132
1133         return tipc_add_tlv(msg->rep, TIPC_TLV_NODE_INFO, &node_info,
1134                             sizeof(node_info));
1135 }
1136
1137 static int tipc_nl_compat_net_set(struct tipc_nl_compat_cmd_doit *cmd,
1138                                   struct sk_buff *skb,
1139                                   struct tipc_nl_compat_msg *msg)
1140 {
1141         u32 val;
1142         struct nlattr *net;
1143
1144         val = ntohl(*(__be32 *)TLV_DATA(msg->req));
1145
1146         net = nla_nest_start_noflag(skb, TIPC_NLA_NET);
1147         if (!net)
1148                 return -EMSGSIZE;
1149
1150         if (msg->cmd == TIPC_CMD_SET_NODE_ADDR) {
1151                 if (nla_put_u32(skb, TIPC_NLA_NET_ADDR, val))
1152                         return -EMSGSIZE;
1153         } else if (msg->cmd == TIPC_CMD_SET_NETID) {
1154                 if (nla_put_u32(skb, TIPC_NLA_NET_ID, val))
1155                         return -EMSGSIZE;
1156         }
1157         nla_nest_end(skb, net);
1158
1159         return 0;
1160 }
1161
1162 static int tipc_nl_compat_net_dump(struct tipc_nl_compat_msg *msg,
1163                                    struct nlattr **attrs)
1164 {
1165         __be32 id;
1166         struct nlattr *net[TIPC_NLA_NET_MAX + 1];
1167         int err;
1168
1169         if (!attrs[TIPC_NLA_NET])
1170                 return -EINVAL;
1171
1172         err = nla_parse_nested_deprecated(net, TIPC_NLA_NET_MAX,
1173                                           attrs[TIPC_NLA_NET], NULL, NULL);
1174         if (err)
1175                 return err;
1176
1177         id = htonl(nla_get_u32(net[TIPC_NLA_NET_ID]));
1178
1179         return tipc_add_tlv(msg->rep, TIPC_TLV_UNSIGNED, &id, sizeof(id));
1180 }
1181
1182 static int tipc_cmd_show_stats_compat(struct tipc_nl_compat_msg *msg)
1183 {
1184         msg->rep = tipc_tlv_alloc(ULTRA_STRING_MAX_LEN);
1185         if (!msg->rep)
1186                 return -ENOMEM;
1187
1188         tipc_tlv_init(msg->rep, TIPC_TLV_ULTRA_STRING);
1189         tipc_tlv_sprintf(msg->rep, "TIPC version " TIPC_MOD_VER "\n");
1190
1191         return 0;
1192 }
1193
1194 static int tipc_nl_compat_handle(struct tipc_nl_compat_msg *msg)
1195 {
1196         struct tipc_nl_compat_cmd_dump dump;
1197         struct tipc_nl_compat_cmd_doit doit;
1198
1199         memset(&dump, 0, sizeof(dump));
1200         memset(&doit, 0, sizeof(doit));
1201
1202         switch (msg->cmd) {
1203         case TIPC_CMD_NOOP:
1204                 msg->rep = tipc_tlv_alloc(0);
1205                 if (!msg->rep)
1206                         return -ENOMEM;
1207                 return 0;
1208         case TIPC_CMD_GET_BEARER_NAMES:
1209                 msg->rep_size = MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME);
1210                 dump.dumpit = tipc_nl_bearer_dump;
1211                 dump.format = tipc_nl_compat_bearer_dump;
1212                 return tipc_nl_compat_dumpit(&dump, msg);
1213         case TIPC_CMD_ENABLE_BEARER:
1214                 msg->req_type = TIPC_TLV_BEARER_CONFIG;
1215                 doit.doit = __tipc_nl_bearer_enable;
1216                 doit.transcode = tipc_nl_compat_bearer_enable;
1217                 return tipc_nl_compat_doit(&doit, msg);
1218         case TIPC_CMD_DISABLE_BEARER:
1219                 msg->req_type = TIPC_TLV_BEARER_NAME;
1220                 doit.doit = __tipc_nl_bearer_disable;
1221                 doit.transcode = tipc_nl_compat_bearer_disable;
1222                 return tipc_nl_compat_doit(&doit, msg);
1223         case TIPC_CMD_SHOW_LINK_STATS:
1224                 msg->req_type = TIPC_TLV_LINK_NAME;
1225                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1226                 msg->rep_type = TIPC_TLV_ULTRA_STRING;
1227                 dump.dumpit = tipc_nl_node_dump_link;
1228                 dump.format = tipc_nl_compat_link_stat_dump;
1229                 return tipc_nl_compat_dumpit(&dump, msg);
1230         case TIPC_CMD_GET_LINKS:
1231                 msg->req_type = TIPC_TLV_NET_ADDR;
1232                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1233                 dump.dumpit = tipc_nl_node_dump_link;
1234                 dump.format = tipc_nl_compat_link_dump;
1235                 return tipc_nl_compat_dumpit(&dump, msg);
1236         case TIPC_CMD_SET_LINK_TOL:
1237         case TIPC_CMD_SET_LINK_PRI:
1238         case TIPC_CMD_SET_LINK_WINDOW:
1239                 msg->req_type =  TIPC_TLV_LINK_CONFIG;
1240                 doit.doit = tipc_nl_node_set_link;
1241                 doit.transcode = tipc_nl_compat_link_set;
1242                 return tipc_nl_compat_doit(&doit, msg);
1243         case TIPC_CMD_RESET_LINK_STATS:
1244                 msg->req_type = TIPC_TLV_LINK_NAME;
1245                 doit.doit = tipc_nl_node_reset_link_stats;
1246                 doit.transcode = tipc_nl_compat_link_reset_stats;
1247                 return tipc_nl_compat_doit(&doit, msg);
1248         case TIPC_CMD_SHOW_NAME_TABLE:
1249                 msg->req_type = TIPC_TLV_NAME_TBL_QUERY;
1250                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1251                 msg->rep_type = TIPC_TLV_ULTRA_STRING;
1252                 dump.header = tipc_nl_compat_name_table_dump_header;
1253                 dump.dumpit = tipc_nl_name_table_dump;
1254                 dump.format = tipc_nl_compat_name_table_dump;
1255                 return tipc_nl_compat_dumpit(&dump, msg);
1256         case TIPC_CMD_SHOW_PORTS:
1257                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1258                 msg->rep_type = TIPC_TLV_ULTRA_STRING;
1259                 dump.dumpit = tipc_nl_sk_dump;
1260                 dump.format = tipc_nl_compat_sk_dump;
1261                 return tipc_nl_compat_dumpit(&dump, msg);
1262         case TIPC_CMD_GET_MEDIA_NAMES:
1263                 msg->rep_size = MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME);
1264                 dump.dumpit = tipc_nl_media_dump;
1265                 dump.format = tipc_nl_compat_media_dump;
1266                 return tipc_nl_compat_dumpit(&dump, msg);
1267         case TIPC_CMD_GET_NODES:
1268                 msg->rep_size = ULTRA_STRING_MAX_LEN;
1269                 dump.dumpit = tipc_nl_node_dump;
1270                 dump.format = tipc_nl_compat_node_dump;
1271                 return tipc_nl_compat_dumpit(&dump, msg);
1272         case TIPC_CMD_SET_NODE_ADDR:
1273                 msg->req_type = TIPC_TLV_NET_ADDR;
1274                 doit.doit = __tipc_nl_net_set;
1275                 doit.transcode = tipc_nl_compat_net_set;
1276                 return tipc_nl_compat_doit(&doit, msg);
1277         case TIPC_CMD_SET_NETID:
1278                 msg->req_type = TIPC_TLV_UNSIGNED;
1279                 doit.doit = __tipc_nl_net_set;
1280                 doit.transcode = tipc_nl_compat_net_set;
1281                 return tipc_nl_compat_doit(&doit, msg);
1282         case TIPC_CMD_GET_NETID:
1283                 msg->rep_size = sizeof(u32);
1284                 dump.dumpit = tipc_nl_net_dump;
1285                 dump.format = tipc_nl_compat_net_dump;
1286                 return tipc_nl_compat_dumpit(&dump, msg);
1287         case TIPC_CMD_SHOW_STATS:
1288                 return tipc_cmd_show_stats_compat(msg);
1289         }
1290
1291         return -EOPNOTSUPP;
1292 }
1293
1294 static int tipc_nl_compat_recv(struct sk_buff *skb, struct genl_info *info)
1295 {
1296         int err;
1297         int len;
1298         struct tipc_nl_compat_msg msg;
1299         struct nlmsghdr *req_nlh;
1300         struct nlmsghdr *rep_nlh;
1301         struct tipc_genlmsghdr *req_userhdr = info->userhdr;
1302
1303         memset(&msg, 0, sizeof(msg));
1304
1305         req_nlh = (struct nlmsghdr *)skb->data;
1306         msg.req = nlmsg_data(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN;
1307         msg.cmd = req_userhdr->cmd;
1308         msg.net = genl_info_net(info);
1309         msg.dst_sk = skb->sk;
1310
1311         if ((msg.cmd & 0xC000) && (!netlink_net_capable(skb, CAP_NET_ADMIN))) {
1312                 msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_NET_ADMIN);
1313                 err = -EACCES;
1314                 goto send;
1315         }
1316
1317         msg.req_size = nlmsg_attrlen(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN);
1318         if (msg.req_size && !TLV_OK(msg.req, msg.req_size)) {
1319                 msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED);
1320                 err = -EOPNOTSUPP;
1321                 goto send;
1322         }
1323
1324         err = tipc_nl_compat_handle(&msg);
1325         if ((err == -EOPNOTSUPP) || (err == -EPERM))
1326                 msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED);
1327         else if (err == -EINVAL)
1328                 msg.rep = tipc_get_err_tlv(TIPC_CFG_TLV_ERROR);
1329 send:
1330         if (!msg.rep)
1331                 return err;
1332
1333         len = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN);
1334         skb_push(msg.rep, len);
1335         rep_nlh = nlmsg_hdr(msg.rep);
1336         memcpy(rep_nlh, info->nlhdr, len);
1337         rep_nlh->nlmsg_len = msg.rep->len;
1338         genlmsg_unicast(msg.net, msg.rep, NETLINK_CB(skb).portid);
1339
1340         return err;
1341 }
1342
1343 static const struct genl_small_ops tipc_genl_compat_ops[] = {
1344         {
1345                 .cmd            = TIPC_GENL_CMD,
1346                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1347                 .doit           = tipc_nl_compat_recv,
1348         },
1349 };
1350
1351 static struct genl_family tipc_genl_compat_family __ro_after_init = {
1352         .name           = TIPC_GENL_NAME,
1353         .version        = TIPC_GENL_VERSION,
1354         .hdrsize        = TIPC_GENL_HDRLEN,
1355         .maxattr        = 0,
1356         .netnsok        = true,
1357         .module         = THIS_MODULE,
1358         .small_ops      = tipc_genl_compat_ops,
1359         .n_small_ops    = ARRAY_SIZE(tipc_genl_compat_ops),
1360         .resv_start_op  = TIPC_GENL_CMD + 1,
1361 };
1362
1363 int __init tipc_netlink_compat_start(void)
1364 {
1365         int res;
1366
1367         res = genl_register_family(&tipc_genl_compat_family);
1368         if (res) {
1369                 pr_err("Failed to register legacy compat interface\n");
1370                 return res;
1371         }
1372
1373         return 0;
1374 }
1375
1376 void tipc_netlink_compat_stop(void)
1377 {
1378         genl_unregister_family(&tipc_genl_compat_family);
1379 }