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