net/ipv4/inet_diag.c

   1 /*
   2  * inet_diag.c  Module for monitoring INET transport protocols sockets.
   3  *
   4  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/fcntl.h>
  16 #include <linux/random.h>
  17 #include <linux/slab.h>
  18 #include <linux/cache.h>
  19 #include <linux/init.h>
  20 #include <linux/time.h>
  21
  22 #include <net/icmp.h>
  23 #include <net/tcp.h>
  24 #include <net/ipv6.h>
  25 #include <net/inet_common.h>
  26 #include <net/inet_connection_sock.h>
  27 #include <net/inet_hashtables.h>
  28 #include <net/inet_timewait_sock.h>
  29 #include <net/inet6_hashtables.h>
  30 #include <net/netlink.h>
  31
  32 #include <linux/inet.h>
  33 #include <linux/stddef.h>
  34
  35 #include <linux/inet_diag.h>
  36 #include <linux/sock_diag.h>
  37
  38 static const struct inet_diag_handler **inet_diag_table;
  39
  40 struct inet_diag_entry {
  41         __be32 *saddr;
  42         __be32 *daddr;
  43         u16 sport;
  44         u16 dport;
  45         u16 family;
  46         u16 userlocks;
  47 #if IS_ENABLED(CONFIG_IPV6)
  48         struct in6_addr saddr_storage;  /* for IPv4-mapped-IPv6 addresses */
  49         struct in6_addr daddr_storage;  /* for IPv4-mapped-IPv6 addresses */
  50 #endif
  51 };
  52
  53 static DEFINE_MUTEX(inet_diag_table_mutex);
  54
  55 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
  56 {
  57         if (!inet_diag_table[proto])
  58                 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
  59                                NETLINK_SOCK_DIAG, AF_INET, proto);
  60
  61         mutex_lock(&inet_diag_table_mutex);
  62         if (!inet_diag_table[proto])
  63                 return ERR_PTR(-ENOENT);
  64
  65         return inet_diag_table[proto];
  66 }
  67
  68 static inline void inet_diag_unlock_handler(
  69         const struct inet_diag_handler *handler)
  70 {
  71         mutex_unlock(&inet_diag_table_mutex);
  72 }
  73
  74 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
  75                               struct sk_buff *skb, struct inet_diag_req_v2 *req,
  76                               struct user_namespace *user_ns,
  77                               u32 portid, u32 seq, u16 nlmsg_flags,
  78                               const struct nlmsghdr *unlh)
  79 {
  80         const struct inet_sock *inet = inet_sk(sk);
  81         struct inet_diag_msg *r;
  82         struct nlmsghdr  *nlh;
  83         struct nlattr *attr;
  84         void *info = NULL;
  85         const struct inet_diag_handler *handler;
  86         int ext = req->idiag_ext;
  87
  88         handler = inet_diag_table[req->sdiag_protocol];
  89         BUG_ON(handler == NULL);
  90
  91         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
  92                         nlmsg_flags);
  93         if (!nlh)
  94                 return -EMSGSIZE;
  95
  96         r = nlmsg_data(nlh);
  97         BUG_ON(sk->sk_state == TCP_TIME_WAIT);
  98
  99         r->idiag_family = sk->sk_family;
 100         r->idiag_state = sk->sk_state;
 101         r->idiag_timer = 0;
 102         r->idiag_retrans = 0;
 103
 104         r->id.idiag_if = sk->sk_bound_dev_if;
 105         sock_diag_save_cookie(sk, r->id.idiag_cookie);
 106
 107         r->id.idiag_sport = inet->inet_sport;
 108         r->id.idiag_dport = inet->inet_dport;
 109
 110         memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
 111         memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
 112
 113         r->id.idiag_src[0] = inet->inet_rcv_saddr;
 114         r->id.idiag_dst[0] = inet->inet_daddr;
 115
 116         if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
 117                 goto errout;
 118
 119         /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
 120          * hence this needs to be included regardless of socket family.
 121          */
 122         if (ext & (1 << (INET_DIAG_TOS - 1)))
 123                 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
 124                         goto errout;
 125
 126 #if IS_ENABLED(CONFIG_IPV6)
 127         if (r->idiag_family == AF_INET6) {
 128
 129                 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
 130                 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
 131
 132                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
 133                         if (nla_put_u8(skb, INET_DIAG_TCLASS,
 134                                        inet6_sk(sk)->tclass) < 0)
 135                                 goto errout;
 136         }
 137 #endif
 138
 139         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 140         r->idiag_inode = sock_i_ino(sk);
 141
 142         if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
 143                 struct inet_diag_meminfo minfo = {
 144                         .idiag_rmem = sk_rmem_alloc_get(sk),
 145                         .idiag_wmem = sk->sk_wmem_queued,
 146                         .idiag_fmem = sk->sk_forward_alloc,
 147                         .idiag_tmem = sk_wmem_alloc_get(sk),
 148                 };
 149
 150                 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
 151                         goto errout;
 152         }
 153
 154         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
 155                 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
 156                         goto errout;
 157
 158         if (icsk == NULL) {
 159                 handler->idiag_get_info(sk, r, NULL);
 160                 goto out;
 161         }
 162
 163 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
 164
 165         if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
 166             icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
 167             icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
 168                 r->idiag_timer = 1;
 169                 r->idiag_retrans = icsk->icsk_retransmits;
 170                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 171         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 172                 r->idiag_timer = 4;
 173                 r->idiag_retrans = icsk->icsk_probes_out;
 174                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 175         } else if (timer_pending(&sk->sk_timer)) {
 176                 r->idiag_timer = 2;
 177                 r->idiag_retrans = icsk->icsk_probes_out;
 178                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 179         } else {
 180                 r->idiag_timer = 0;
 181                 r->idiag_expires = 0;
 182         }
 183 #undef EXPIRES_IN_MS
 184
 185         if (ext & (1 << (INET_DIAG_INFO - 1))) {
 186                 attr = nla_reserve(skb, INET_DIAG_INFO,
 187                                    sizeof(struct tcp_info));
 188                 if (!attr)
 189                         goto errout;
 190
 191                 info = nla_data(attr);
 192         }
 193
 194         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
 195                 if (nla_put_string(skb, INET_DIAG_CONG,
 196                                    icsk->icsk_ca_ops->name) < 0)
 197                         goto errout;
 198
 199         handler->idiag_get_info(sk, r, info);
 200
 201         if (sk->sk_state < TCP_TIME_WAIT &&
 202             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
 203                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
 204
 205 out:
 206         nlmsg_end(skb, nlh);
 207         return 0;
 208
 209 errout:
 210         nlmsg_cancel(skb, nlh);
 211         return -EMSGSIZE;
 212 }
 213 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
 214
 215 static int inet_csk_diag_fill(struct sock *sk,
 216                               struct sk_buff *skb, struct inet_diag_req_v2 *req,
 217                               struct user_namespace *user_ns,
 218                               u32 portid, u32 seq, u16 nlmsg_flags,
 219                               const struct nlmsghdr *unlh)
 220 {
 221         return inet_sk_diag_fill(sk, inet_csk(sk),
 222                         skb, req, user_ns, portid, seq, nlmsg_flags, unlh);
 223 }
 224
 225 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
 226                                struct sk_buff *skb, struct inet_diag_req_v2 *req,
 227                                u32 portid, u32 seq, u16 nlmsg_flags,
 228                                const struct nlmsghdr *unlh)
 229 {
 230         s32 tmo;
 231         struct inet_diag_msg *r;
 232         struct nlmsghdr *nlh;
 233
 234         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 235                         nlmsg_flags);
 236         if (!nlh)
 237                 return -EMSGSIZE;
 238
 239         r = nlmsg_data(nlh);
 240         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 241
 242         tmo = tw->tw_ttd - inet_tw_time_stamp();
 243         if (tmo < 0)
 244                 tmo = 0;
 245
 246         r->idiag_family       = tw->tw_family;
 247         r->idiag_retrans      = 0;
 248
 249         r->id.idiag_if        = tw->tw_bound_dev_if;
 250         sock_diag_save_cookie(tw, r->id.idiag_cookie);
 251
 252         r->id.idiag_sport     = tw->tw_sport;
 253         r->id.idiag_dport     = tw->tw_dport;
 254
 255         memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
 256         memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
 257
 258         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
 259         r->id.idiag_dst[0]    = tw->tw_daddr;
 260
 261         r->idiag_state        = tw->tw_substate;
 262         r->idiag_timer        = 3;
 263         r->idiag_expires      = jiffies_to_msecs(tmo);
 264         r->idiag_rqueue       = 0;
 265         r->idiag_wqueue       = 0;
 266         r->idiag_uid          = 0;
 267         r->idiag_inode        = 0;
 268 #if IS_ENABLED(CONFIG_IPV6)
 269         if (tw->tw_family == AF_INET6) {
 270                 *(struct in6_addr *)r->id.idiag_src = tw->tw_v6_rcv_saddr;
 271                 *(struct in6_addr *)r->id.idiag_dst = tw->tw_v6_daddr;
 272         }
 273 #endif
 274
 275         nlmsg_end(skb, nlh);
 276         return 0;
 277 }
 278
 279 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 280                         struct inet_diag_req_v2 *r,
 281                         struct user_namespace *user_ns,
 282                         u32 portid, u32 seq, u16 nlmsg_flags,
 283                         const struct nlmsghdr *unlh)
 284 {
 285         if (sk->sk_state == TCP_TIME_WAIT)
 286                 return inet_twsk_diag_fill(inet_twsk(sk), skb, r, portid, seq,
 287                                            nlmsg_flags, unlh);
 288
 289         return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
 290                                   nlmsg_flags, unlh);
 291 }
 292
 293 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
 294                 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
 295 {
 296         int err;
 297         struct sock *sk;
 298         struct sk_buff *rep;
 299         struct net *net = sock_net(in_skb->sk);
 300
 301         err = -EINVAL;
 302         if (req->sdiag_family == AF_INET) {
 303                 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
 304                                  req->id.idiag_dport, req->id.idiag_src[0],
 305                                  req->id.idiag_sport, req->id.idiag_if);
 306         }
 307 #if IS_ENABLED(CONFIG_IPV6)
 308         else if (req->sdiag_family == AF_INET6) {
 309                 sk = inet6_lookup(net, hashinfo,
 310                                   (struct in6_addr *)req->id.idiag_dst,
 311                                   req->id.idiag_dport,
 312                                   (struct in6_addr *)req->id.idiag_src,
 313                                   req->id.idiag_sport,
 314                                   req->id.idiag_if);
 315         }
 316 #endif
 317         else {
 318                 goto out_nosk;
 319         }
 320
 321         err = -ENOENT;
 322         if (sk == NULL)
 323                 goto out_nosk;
 324
 325         err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
 326         if (err)
 327                 goto out;
 328
 329         rep = nlmsg_new(sizeof(struct inet_diag_msg) +
 330                         sizeof(struct inet_diag_meminfo) +
 331                         sizeof(struct tcp_info) + 64, GFP_KERNEL);
 332         if (!rep) {
 333                 err = -ENOMEM;
 334                 goto out;
 335         }
 336
 337         err = sk_diag_fill(sk, rep, req,
 338                            sk_user_ns(NETLINK_CB(in_skb).sk),
 339                            NETLINK_CB(in_skb).portid,
 340                            nlh->nlmsg_seq, 0, nlh);
 341         if (err < 0) {
 342                 WARN_ON(err == -EMSGSIZE);
 343                 nlmsg_free(rep);
 344                 goto out;
 345         }
 346         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 347                               MSG_DONTWAIT);
 348         if (err > 0)
 349                 err = 0;
 350
 351 out:
 352         if (sk)
 353                 sock_gen_put(sk);
 354
 355 out_nosk:
 356         return err;
 357 }
 358 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 359
 360 static int inet_diag_get_exact(struct sk_buff *in_skb,
 361                                const struct nlmsghdr *nlh,
 362                                struct inet_diag_req_v2 *req)
 363 {
 364         const struct inet_diag_handler *handler;
 365         int err;
 366
 367         handler = inet_diag_lock_handler(req->sdiag_protocol);
 368         if (IS_ERR(handler))
 369                 err = PTR_ERR(handler);
 370         else
 371                 err = handler->dump_one(in_skb, nlh, req);
 372         inet_diag_unlock_handler(handler);
 373
 374         return err;
 375 }
 376
 377 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 378 {
 379         int words = bits >> 5;
 380
 381         bits &= 0x1f;
 382
 383         if (words) {
 384                 if (memcmp(a1, a2, words << 2))
 385                         return 0;
 386         }
 387         if (bits) {
 388                 __be32 w1, w2;
 389                 __be32 mask;
 390
 391                 w1 = a1[words];
 392                 w2 = a2[words];
 393
 394                 mask = htonl((0xffffffff) << (32 - bits));
 395
 396                 if ((w1 ^ w2) & mask)
 397                         return 0;
 398         }
 399
 400         return 1;
 401 }
 402
 403
 404 static int inet_diag_bc_run(const struct nlattr *_bc,
 405                 const struct inet_diag_entry *entry)
 406 {
 407         const void *bc = nla_data(_bc);
 408         int len = nla_len(_bc);
 409
 410         while (len > 0) {
 411                 int yes = 1;
 412                 const struct inet_diag_bc_op *op = bc;
 413
 414                 switch (op->code) {
 415                 case INET_DIAG_BC_NOP:
 416                         break;
 417                 case INET_DIAG_BC_JMP:
 418                         yes = 0;
 419                         break;
 420                 case INET_DIAG_BC_S_GE:
 421                         yes = entry->sport >= op[1].no;
 422                         break;
 423                 case INET_DIAG_BC_S_LE:
 424                         yes = entry->sport <= op[1].no;
 425                         break;
 426                 case INET_DIAG_BC_D_GE:
 427                         yes = entry->dport >= op[1].no;
 428                         break;
 429                 case INET_DIAG_BC_D_LE:
 430                         yes = entry->dport <= op[1].no;
 431                         break;
 432                 case INET_DIAG_BC_AUTO:
 433                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 434                         break;
 435                 case INET_DIAG_BC_S_COND:
 436                 case INET_DIAG_BC_D_COND: {
 437                         struct inet_diag_hostcond *cond;
 438                         __be32 *addr;
 439
 440                         cond = (struct inet_diag_hostcond *)(op + 1);
 441                         if (cond->port != -1 &&
 442                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 443                                              entry->sport : entry->dport)) {
 444                                 yes = 0;
 445                                 break;
 446                         }
 447
 448                         if (op->code == INET_DIAG_BC_S_COND)
 449                                 addr = entry->saddr;
 450                         else
 451                                 addr = entry->daddr;
 452
 453                         if (cond->family != AF_UNSPEC &&
 454                             cond->family != entry->family) {
 455                                 if (entry->family == AF_INET6 &&
 456                                     cond->family == AF_INET) {
 457                                         if (addr[0] == 0 && addr[1] == 0 &&
 458                                             addr[2] == htonl(0xffff) &&
 459                                             bitstring_match(addr + 3,
 460                                                             cond->addr,
 461                                                             cond->prefix_len))
 462                                                 break;
 463                                 }
 464                                 yes = 0;
 465                                 break;
 466                         }
 467
 468                         if (cond->prefix_len == 0)
 469                                 break;
 470                         if (bitstring_match(addr, cond->addr,
 471                                             cond->prefix_len))
 472                                 break;
 473                         yes = 0;
 474                         break;
 475                 }
 476                 }
 477
 478                 if (yes) {
 479                         len -= op->yes;
 480                         bc += op->yes;
 481                 } else {
 482                         len -= op->no;
 483                         bc += op->no;
 484                 }
 485         }
 486         return len == 0;
 487 }
 488
 489 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 490 {
 491         struct inet_diag_entry entry;
 492         struct inet_sock *inet = inet_sk(sk);
 493
 494         if (bc == NULL)
 495                 return 1;
 496
 497         entry.family = sk->sk_family;
 498 #if IS_ENABLED(CONFIG_IPV6)
 499         if (entry.family == AF_INET6) {
 500
 501                 entry.saddr = sk->sk_v6_rcv_saddr.s6_addr32;
 502                 entry.daddr = sk->sk_v6_daddr.s6_addr32;
 503         } else
 504 #endif
 505         {
 506                 entry.saddr = &inet->inet_rcv_saddr;
 507                 entry.daddr = &inet->inet_daddr;
 508         }
 509         entry.sport = inet->inet_num;
 510         entry.dport = ntohs(inet->inet_dport);
 511         entry.userlocks = sk->sk_userlocks;
 512
 513         return inet_diag_bc_run(bc, &entry);
 514 }
 515 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 516
 517 static int valid_cc(const void *bc, int len, int cc)
 518 {
 519         while (len >= 0) {
 520                 const struct inet_diag_bc_op *op = bc;
 521
 522                 if (cc > len)
 523                         return 0;
 524                 if (cc == len)
 525                         return 1;
 526                 if (op->yes < 4 || op->yes & 3)
 527                         return 0;
 528                 len -= op->yes;
 529                 bc  += op->yes;
 530         }
 531         return 0;
 532 }
 533
 534 /* Validate an inet_diag_hostcond. */
 535 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
 536                            int *min_len)
 537 {
 538         int addr_len;
 539         struct inet_diag_hostcond *cond;
 540
 541         /* Check hostcond space. */
 542         *min_len += sizeof(struct inet_diag_hostcond);
 543         if (len < *min_len)
 544                 return false;
 545         cond = (struct inet_diag_hostcond *)(op + 1);
 546
 547         /* Check address family and address length. */
 548         switch (cond->family) {
 549         case AF_UNSPEC:
 550                 addr_len = 0;
 551                 break;
 552         case AF_INET:
 553                 addr_len = sizeof(struct in_addr);
 554                 break;
 555         case AF_INET6:
 556                 addr_len = sizeof(struct in6_addr);
 557                 break;
 558         default:
 559                 return false;
 560         }
 561         *min_len += addr_len;
 562         if (len < *min_len)
 563                 return false;
 564
 565         /* Check prefix length (in bits) vs address length (in bytes). */
 566         if (cond->prefix_len > 8 * addr_len)
 567                 return false;
 568
 569         return true;
 570 }
 571
 572 /* Validate a port comparison operator. */
 573 static inline bool valid_port_comparison(const struct inet_diag_bc_op *op,
 574                                          int len, int *min_len)
 575 {
 576         /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
 577         *min_len += sizeof(struct inet_diag_bc_op);
 578         if (len < *min_len)
 579                 return false;
 580         return true;
 581 }
 582
 583 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 584 {
 585         const void *bc = bytecode;
 586         int  len = bytecode_len;
 587
 588         while (len > 0) {
 589                 const struct inet_diag_bc_op *op = bc;
 590                 int min_len = sizeof(struct inet_diag_bc_op);
 591
 592 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 593                 switch (op->code) {
 594                 case INET_DIAG_BC_S_COND:
 595                 case INET_DIAG_BC_D_COND:
 596                         if (!valid_hostcond(bc, len, &min_len))
 597                                 return -EINVAL;
 598                         break;
 599                 case INET_DIAG_BC_S_GE:
 600                 case INET_DIAG_BC_S_LE:
 601                 case INET_DIAG_BC_D_GE:
 602                 case INET_DIAG_BC_D_LE:
 603                         if (!valid_port_comparison(bc, len, &min_len))
 604                                 return -EINVAL;
 605                         break;
 606                 case INET_DIAG_BC_AUTO:
 607                 case INET_DIAG_BC_JMP:
 608                 case INET_DIAG_BC_NOP:
 609                         break;
 610                 default:
 611                         return -EINVAL;
 612                 }
 613
 614                 if (op->code != INET_DIAG_BC_NOP) {
 615                         if (op->no < min_len || op->no > len + 4 || op->no & 3)
 616                                 return -EINVAL;
 617                         if (op->no < len &&
 618                             !valid_cc(bytecode, bytecode_len, len - op->no))
 619                                 return -EINVAL;
 620                 }
 621
 622                 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
 623                         return -EINVAL;
 624                 bc  += op->yes;
 625                 len -= op->yes;
 626         }
 627         return len == 0 ? 0 : -EINVAL;
 628 }
 629
 630 static int inet_csk_diag_dump(struct sock *sk,
 631                               struct sk_buff *skb,
 632                               struct netlink_callback *cb,
 633                               struct inet_diag_req_v2 *r,
 634                               const struct nlattr *bc)
 635 {
 636         if (!inet_diag_bc_sk(bc, sk))
 637                 return 0;
 638
 639         return inet_csk_diag_fill(sk, skb, r,
 640                                   sk_user_ns(NETLINK_CB(cb->skb).sk),
 641                                   NETLINK_CB(cb->skb).portid,
 642                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 643 }
 644
 645 static int inet_twsk_diag_dump(struct sock *sk,
 646                                struct sk_buff *skb,
 647                                struct netlink_callback *cb,
 648                                struct inet_diag_req_v2 *r,
 649                                const struct nlattr *bc)
 650 {
 651         struct inet_timewait_sock *tw = inet_twsk(sk);
 652
 653         if (bc != NULL) {
 654                 struct inet_diag_entry entry;
 655
 656                 entry.family = tw->tw_family;
 657 #if IS_ENABLED(CONFIG_IPV6)
 658                 if (tw->tw_family == AF_INET6) {
 659                         entry.saddr = tw->tw_v6_rcv_saddr.s6_addr32;
 660                         entry.daddr = tw->tw_v6_daddr.s6_addr32;
 661                 } else
 662 #endif
 663                 {
 664                         entry.saddr = &tw->tw_rcv_saddr;
 665                         entry.daddr = &tw->tw_daddr;
 666                 }
 667                 entry.sport = tw->tw_num;
 668                 entry.dport = ntohs(tw->tw_dport);
 669                 entry.userlocks = 0;
 670
 671                 if (!inet_diag_bc_run(bc, &entry))
 672                         return 0;
 673         }
 674
 675         return inet_twsk_diag_fill(tw, skb, r,
 676                                    NETLINK_CB(cb->skb).portid,
 677                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 678 }
 679
 680 /* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses
 681  * from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6.
 682  */
 683 static inline void inet_diag_req_addrs(const struct sock *sk,
 684                                        const struct request_sock *req,
 685                                        struct inet_diag_entry *entry)
 686 {
 687         struct inet_request_sock *ireq = inet_rsk(req);
 688
 689 #if IS_ENABLED(CONFIG_IPV6)
 690         if (sk->sk_family == AF_INET6) {
 691                 if (req->rsk_ops->family == AF_INET6) {
 692                         entry->saddr = ireq->ir_v6_loc_addr.s6_addr32;
 693                         entry->daddr = ireq->ir_v6_rmt_addr.s6_addr32;
 694                 } else if (req->rsk_ops->family == AF_INET) {
 695                         ipv6_addr_set_v4mapped(ireq->ir_loc_addr,
 696                                                &entry->saddr_storage);
 697                         ipv6_addr_set_v4mapped(ireq->ir_rmt_addr,
 698                                                &entry->daddr_storage);
 699                         entry->saddr = entry->saddr_storage.s6_addr32;
 700                         entry->daddr = entry->daddr_storage.s6_addr32;
 701                 }
 702         } else
 703 #endif
 704         {
 705                 entry->saddr = &ireq->ir_loc_addr;
 706                 entry->daddr = &ireq->ir_rmt_addr;
 707         }
 708 }
 709
 710 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 711                               struct request_sock *req,
 712                               struct user_namespace *user_ns,
 713                               u32 portid, u32 seq,
 714                               const struct nlmsghdr *unlh)
 715 {
 716         const struct inet_request_sock *ireq = inet_rsk(req);
 717         struct inet_sock *inet = inet_sk(sk);
 718         struct inet_diag_msg *r;
 719         struct nlmsghdr *nlh;
 720         long tmo;
 721
 722         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 723                         NLM_F_MULTI);
 724         if (!nlh)
 725                 return -EMSGSIZE;
 726
 727         r = nlmsg_data(nlh);
 728         r->idiag_family = sk->sk_family;
 729         r->idiag_state = TCP_SYN_RECV;
 730         r->idiag_timer = 1;
 731         r->idiag_retrans = req->num_retrans;
 732
 733         r->id.idiag_if = sk->sk_bound_dev_if;
 734         sock_diag_save_cookie(req, r->id.idiag_cookie);
 735
 736         tmo = req->expires - jiffies;
 737         if (tmo < 0)
 738                 tmo = 0;
 739
 740         r->id.idiag_sport = inet->inet_sport;
 741         r->id.idiag_dport = ireq->ir_rmt_port;
 742
 743         memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
 744         memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
 745
 746         r->id.idiag_src[0] = ireq->ir_loc_addr;
 747         r->id.idiag_dst[0] = ireq->ir_rmt_addr;
 748
 749         r->idiag_expires = jiffies_to_msecs(tmo);
 750         r->idiag_rqueue = 0;
 751         r->idiag_wqueue = 0;
 752         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 753         r->idiag_inode = 0;
 754 #if IS_ENABLED(CONFIG_IPV6)
 755         if (r->idiag_family == AF_INET6) {
 756                 struct inet_diag_entry entry;
 757                 inet_diag_req_addrs(sk, req, &entry);
 758                 memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr));
 759                 memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr));
 760         }
 761 #endif
 762
 763         nlmsg_end(skb, nlh);
 764         return 0;
 765 }
 766
 767 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 768                                struct netlink_callback *cb,
 769                                struct inet_diag_req_v2 *r,
 770                                const struct nlattr *bc)
 771 {
 772         struct inet_diag_entry entry;
 773         struct inet_connection_sock *icsk = inet_csk(sk);
 774         struct listen_sock *lopt;
 775         struct inet_sock *inet = inet_sk(sk);
 776         int j, s_j;
 777         int reqnum, s_reqnum;
 778         int err = 0;
 779
 780         s_j = cb->args[3];
 781         s_reqnum = cb->args[4];
 782
 783         if (s_j > 0)
 784                 s_j--;
 785
 786         entry.family = sk->sk_family;
 787
 788         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 789
 790         lopt = icsk->icsk_accept_queue.listen_opt;
 791         if (!lopt || !lopt->qlen)
 792                 goto out;
 793
 794         if (bc != NULL) {
 795                 entry.sport = inet->inet_num;
 796                 entry.userlocks = sk->sk_userlocks;
 797         }
 798
 799         for (j = s_j; j < lopt->nr_table_entries; j++) {
 800                 struct request_sock *req, *head = lopt->syn_table[j];
 801
 802                 reqnum = 0;
 803                 for (req = head; req; reqnum++, req = req->dl_next) {
 804                         struct inet_request_sock *ireq = inet_rsk(req);
 805
 806                         if (reqnum < s_reqnum)
 807                                 continue;
 808                         if (r->id.idiag_dport != ireq->ir_rmt_port &&
 809                             r->id.idiag_dport)
 810                                 continue;
 811
 812                         if (bc) {
 813                                 inet_diag_req_addrs(sk, req, &entry);
 814                                 entry.dport = ntohs(ireq->ir_rmt_port);
 815
 816                                 if (!inet_diag_bc_run(bc, &entry))
 817                                         continue;
 818                         }
 819
 820                         err = inet_diag_fill_req(skb, sk, req,
 821                                                sk_user_ns(NETLINK_CB(cb->skb).sk),
 822                                                NETLINK_CB(cb->skb).portid,
 823                                                cb->nlh->nlmsg_seq, cb->nlh);
 824                         if (err < 0) {
 825                                 cb->args[3] = j + 1;
 826                                 cb->args[4] = reqnum;
 827                                 goto out;
 828                         }
 829                 }
 830
 831                 s_reqnum = 0;
 832         }
 833
 834 out:
 835         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 836
 837         return err;
 838 }
 839
 840 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 841                 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
 842 {
 843         int i, num;
 844         int s_i, s_num;
 845         struct net *net = sock_net(skb->sk);
 846
 847         s_i = cb->args[1];
 848         s_num = num = cb->args[2];
 849
 850         if (cb->args[0] == 0) {
 851                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 852                         goto skip_listen_ht;
 853
 854                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 855                         struct sock *sk;
 856                         struct hlist_nulls_node *node;
 857                         struct inet_listen_hashbucket *ilb;
 858
 859                         num = 0;
 860                         ilb = &hashinfo->listening_hash[i];
 861                         spin_lock_bh(&ilb->lock);
 862                         sk_nulls_for_each(sk, node, &ilb->head) {
 863                                 struct inet_sock *inet = inet_sk(sk);
 864
 865                                 if (!net_eq(sock_net(sk), net))
 866                                         continue;
 867
 868                                 if (num < s_num) {
 869                                         num++;
 870                                         continue;
 871                                 }
 872
 873                                 if (r->sdiag_family != AF_UNSPEC &&
 874                                                 sk->sk_family != r->sdiag_family)
 875                                         goto next_listen;
 876
 877                                 if (r->id.idiag_sport != inet->inet_sport &&
 878                                     r->id.idiag_sport)
 879                                         goto next_listen;
 880
 881                                 if (!(r->idiag_states & TCPF_LISTEN) ||
 882                                     r->id.idiag_dport ||
 883                                     cb->args[3] > 0)
 884                                         goto syn_recv;
 885
 886                                 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 887                                         spin_unlock_bh(&ilb->lock);
 888                                         goto done;
 889                                 }
 890
 891 syn_recv:
 892                                 if (!(r->idiag_states & TCPF_SYN_RECV))
 893                                         goto next_listen;
 894
 895                                 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
 896                                         spin_unlock_bh(&ilb->lock);
 897                                         goto done;
 898                                 }
 899
 900 next_listen:
 901                                 cb->args[3] = 0;
 902                                 cb->args[4] = 0;
 903                                 ++num;
 904                         }
 905                         spin_unlock_bh(&ilb->lock);
 906
 907                         s_num = 0;
 908                         cb->args[3] = 0;
 909                         cb->args[4] = 0;
 910                 }
 911 skip_listen_ht:
 912                 cb->args[0] = 1;
 913                 s_i = num = s_num = 0;
 914         }
 915
 916         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
 917                 goto out;
 918
 919         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
 920                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 921                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
 922                 struct sock *sk;
 923                 struct hlist_nulls_node *node;
 924
 925                 num = 0;
 926
 927                 if (hlist_nulls_empty(&head->chain))
 928                         continue;
 929
 930                 if (i > s_i)
 931                         s_num = 0;
 932
 933                 spin_lock_bh(lock);
 934                 sk_nulls_for_each(sk, node, &head->chain) {
 935                         int res;
 936                         int state;
 937
 938                         if (!net_eq(sock_net(sk), net))
 939                                 continue;
 940                         if (num < s_num)
 941                                 goto next_normal;
 942                         state = (sk->sk_state == TCP_TIME_WAIT) ?
 943                                 inet_twsk(sk)->tw_substate : sk->sk_state;
 944                         if (!(r->idiag_states & (1 << state)))
 945                                 goto next_normal;
 946                         if (r->sdiag_family != AF_UNSPEC &&
 947                             sk->sk_family != r->sdiag_family)
 948                                 goto next_normal;
 949                         if (r->id.idiag_sport != htons(sk->sk_num) &&
 950                             r->id.idiag_sport)
 951                                 goto next_normal;
 952                         if (r->id.idiag_dport != sk->sk_dport &&
 953                             r->id.idiag_dport)
 954                                 goto next_normal;
 955                         if (sk->sk_state == TCP_TIME_WAIT)
 956                                 res = inet_twsk_diag_dump(sk, skb, cb, r, bc);
 957                         else
 958                                 res = inet_csk_diag_dump(sk, skb, cb, r, bc);
 959                         if (res < 0) {
 960                                 spin_unlock_bh(lock);
 961                                 goto done;
 962                         }
 963 next_normal:
 964                         ++num;
 965                 }
 966
 967                 spin_unlock_bh(lock);
 968         }
 969
 970 done:
 971         cb->args[1] = i;
 972         cb->args[2] = num;
 973 out:
 974         ;
 975 }
 976 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
 977
 978 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 979                 struct inet_diag_req_v2 *r, struct nlattr *bc)
 980 {
 981         const struct inet_diag_handler *handler;
 982         int err = 0;
 983
 984         handler = inet_diag_lock_handler(r->sdiag_protocol);
 985         if (!IS_ERR(handler))
 986                 handler->dump(skb, cb, r, bc);
 987         else
 988                 err = PTR_ERR(handler);
 989         inet_diag_unlock_handler(handler);
 990
 991         return err ? : skb->len;
 992 }
 993
 994 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 995 {
 996         struct nlattr *bc = NULL;
 997         int hdrlen = sizeof(struct inet_diag_req_v2);
 998
 999         if (nlmsg_attrlen(cb->nlh, hdrlen))
1000                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1001
1002         return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1003 }
1004
1005 static inline int inet_diag_type2proto(int type)
1006 {
1007         switch (type) {
1008         case TCPDIAG_GETSOCK:
1009                 return IPPROTO_TCP;
1010         case DCCPDIAG_GETSOCK:
1011                 return IPPROTO_DCCP;
1012         default:
1013                 return 0;
1014         }
1015 }
1016
1017 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
1018 {
1019         struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1020         struct inet_diag_req_v2 req;
1021         struct nlattr *bc = NULL;
1022         int hdrlen = sizeof(struct inet_diag_req);
1023
1024         req.sdiag_family = AF_UNSPEC; /* compatibility */
1025         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1026         req.idiag_ext = rc->idiag_ext;
1027         req.idiag_states = rc->idiag_states;
1028         req.id = rc->id;
1029
1030         if (nlmsg_attrlen(cb->nlh, hdrlen))
1031                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1032
1033         return __inet_diag_dump(skb, cb, &req, bc);
1034 }
1035
1036 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1037                                const struct nlmsghdr *nlh)
1038 {
1039         struct inet_diag_req *rc = nlmsg_data(nlh);
1040         struct inet_diag_req_v2 req;
1041
1042         req.sdiag_family = rc->idiag_family;
1043         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1044         req.idiag_ext = rc->idiag_ext;
1045         req.idiag_states = rc->idiag_states;
1046         req.id = rc->id;
1047
1048         return inet_diag_get_exact(in_skb, nlh, &req);
1049 }
1050
1051 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1052 {
1053         int hdrlen = sizeof(struct inet_diag_req);
1054         struct net *net = sock_net(skb->sk);
1055
1056         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1057             nlmsg_len(nlh) < hdrlen)
1058                 return -EINVAL;
1059
1060         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1061                 if (nlmsg_attrlen(nlh, hdrlen)) {
1062                         struct nlattr *attr;
1063
1064                         attr = nlmsg_find_attr(nlh, hdrlen,
1065                                                INET_DIAG_REQ_BYTECODE);
1066                         if (attr == NULL ||
1067                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1068                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1069                                 return -EINVAL;
1070                 }
1071                 {
1072                         struct netlink_dump_control c = {
1073                                 .dump = inet_diag_dump_compat,
1074                         };
1075                         return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1076                 }
1077         }
1078
1079         return inet_diag_get_exact_compat(skb, nlh);
1080 }
1081
1082 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1083 {
1084         int hdrlen = sizeof(struct inet_diag_req_v2);
1085         struct net *net = sock_net(skb->sk);
1086
1087         if (nlmsg_len(h) < hdrlen)
1088                 return -EINVAL;
1089
1090         if (h->nlmsg_flags & NLM_F_DUMP) {
1091                 if (nlmsg_attrlen(h, hdrlen)) {
1092                         struct nlattr *attr;
1093                         attr = nlmsg_find_attr(h, hdrlen,
1094                                                INET_DIAG_REQ_BYTECODE);
1095                         if (attr == NULL ||
1096                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1097                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1098                                 return -EINVAL;
1099                 }
1100                 {
1101                         struct netlink_dump_control c = {
1102                                 .dump = inet_diag_dump,
1103                         };
1104                         return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1105                 }
1106         }
1107
1108         return inet_diag_get_exact(skb, h, nlmsg_data(h));
1109 }
1110
1111 static const struct sock_diag_handler inet_diag_handler = {
1112         .family = AF_INET,
1113         .dump = inet_diag_handler_dump,
1114 };
1115
1116 static const struct sock_diag_handler inet6_diag_handler = {
1117         .family = AF_INET6,
1118         .dump = inet_diag_handler_dump,
1119 };
1120
1121 int inet_diag_register(const struct inet_diag_handler *h)
1122 {
1123         const __u16 type = h->idiag_type;
1124         int err = -EINVAL;
1125
1126         if (type >= IPPROTO_MAX)
1127                 goto out;
1128
1129         mutex_lock(&inet_diag_table_mutex);
1130         err = -EEXIST;
1131         if (inet_diag_table[type] == NULL) {
1132                 inet_diag_table[type] = h;
1133                 err = 0;
1134         }
1135         mutex_unlock(&inet_diag_table_mutex);
1136 out:
1137         return err;
1138 }
1139 EXPORT_SYMBOL_GPL(inet_diag_register);
1140
1141 void inet_diag_unregister(const struct inet_diag_handler *h)
1142 {
1143         const __u16 type = h->idiag_type;
1144
1145         if (type >= IPPROTO_MAX)
1146                 return;
1147
1148         mutex_lock(&inet_diag_table_mutex);
1149         inet_diag_table[type] = NULL;
1150         mutex_unlock(&inet_diag_table_mutex);
1151 }
1152 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1153
1154 static int __init inet_diag_init(void)
1155 {
1156         const int inet_diag_table_size = (IPPROTO_MAX *
1157                                           sizeof(struct inet_diag_handler *));
1158         int err = -ENOMEM;
1159
1160         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1161         if (!inet_diag_table)
1162                 goto out;
1163
1164         err = sock_diag_register(&inet_diag_handler);
1165         if (err)
1166                 goto out_free_nl;
1167
1168         err = sock_diag_register(&inet6_diag_handler);
1169         if (err)
1170                 goto out_free_inet;
1171
1172         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1173 out:
1174         return err;
1175
1176 out_free_inet:
1177         sock_diag_unregister(&inet_diag_handler);
1178 out_free_nl:
1179         kfree(inet_diag_table);
1180         goto out;
1181 }
1182
1183 static void __exit inet_diag_exit(void)
1184 {
1185         sock_diag_unregister(&inet6_diag_handler);
1186         sock_diag_unregister(&inet_diag_handler);
1187         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1188         kfree(inet_diag_table);
1189 }
1190
1191 module_init(inet_diag_init);
1192 module_exit(inet_diag_exit);
1193 MODULE_LICENSE("GPL");
1194 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1195 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);