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         r->id.idiag_src[0] = inet->inet_rcv_saddr;
 110         r->id.idiag_dst[0] = inet->inet_daddr;
 111
 112         /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
 113          * hence this needs to be included regardless of socket family.
 114          */
 115         if (ext & (1 << (INET_DIAG_TOS - 1)))
 116                 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
 117                         goto errout;
 118
 119 #if IS_ENABLED(CONFIG_IPV6)
 120         if (r->idiag_family == AF_INET6) {
 121                 const struct ipv6_pinfo *np = inet6_sk(sk);
 122
 123                 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
 124                 *(struct in6_addr *)r->id.idiag_dst = np->daddr;
 125
 126                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
 127                         if (nla_put_u8(skb, INET_DIAG_TCLASS, np->tclass) < 0)
 128                                 goto errout;
 129         }
 130 #endif
 131
 132         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 133         r->idiag_inode = sock_i_ino(sk);
 134
 135         if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
 136                 struct inet_diag_meminfo minfo = {
 137                         .idiag_rmem = sk_rmem_alloc_get(sk),
 138                         .idiag_wmem = sk->sk_wmem_queued,
 139                         .idiag_fmem = sk->sk_forward_alloc,
 140                         .idiag_tmem = sk_wmem_alloc_get(sk),
 141                 };
 142
 143                 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
 144                         goto errout;
 145         }
 146
 147         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
 148                 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
 149                         goto errout;
 150
 151         if (icsk == NULL) {
 152                 handler->idiag_get_info(sk, r, NULL);
 153                 goto out;
 154         }
 155
 156 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
 157
 158         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
 159                 r->idiag_timer = 1;
 160                 r->idiag_retrans = icsk->icsk_retransmits;
 161                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 162         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 163                 r->idiag_timer = 4;
 164                 r->idiag_retrans = icsk->icsk_probes_out;
 165                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 166         } else if (timer_pending(&sk->sk_timer)) {
 167                 r->idiag_timer = 2;
 168                 r->idiag_retrans = icsk->icsk_probes_out;
 169                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 170         } else {
 171                 r->idiag_timer = 0;
 172                 r->idiag_expires = 0;
 173         }
 174 #undef EXPIRES_IN_MS
 175
 176         if (ext & (1 << (INET_DIAG_INFO - 1))) {
 177                 attr = nla_reserve(skb, INET_DIAG_INFO,
 178                                    sizeof(struct tcp_info));
 179                 if (!attr)
 180                         goto errout;
 181
 182                 info = nla_data(attr);
 183         }
 184
 185         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
 186                 if (nla_put_string(skb, INET_DIAG_CONG,
 187                                    icsk->icsk_ca_ops->name) < 0)
 188                         goto errout;
 189
 190         handler->idiag_get_info(sk, r, info);
 191
 192         if (sk->sk_state < TCP_TIME_WAIT &&
 193             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
 194                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
 195
 196 out:
 197         return nlmsg_end(skb, nlh);
 198
 199 errout:
 200         nlmsg_cancel(skb, nlh);
 201         return -EMSGSIZE;
 202 }
 203 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
 204
 205 static int inet_csk_diag_fill(struct sock *sk,
 206                               struct sk_buff *skb, struct inet_diag_req_v2 *req,
 207                               struct user_namespace *user_ns,
 208                               u32 portid, u32 seq, u16 nlmsg_flags,
 209                               const struct nlmsghdr *unlh)
 210 {
 211         return inet_sk_diag_fill(sk, inet_csk(sk),
 212                         skb, req, user_ns, portid, seq, nlmsg_flags, unlh);
 213 }
 214
 215 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
 216                                struct sk_buff *skb, struct inet_diag_req_v2 *req,
 217                                u32 portid, u32 seq, u16 nlmsg_flags,
 218                                const struct nlmsghdr *unlh)
 219 {
 220         long tmo;
 221         struct inet_diag_msg *r;
 222         struct nlmsghdr *nlh;
 223
 224         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 225                         nlmsg_flags);
 226         if (!nlh)
 227                 return -EMSGSIZE;
 228
 229         r = nlmsg_data(nlh);
 230         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 231
 232         tmo = tw->tw_ttd - jiffies;
 233         if (tmo < 0)
 234                 tmo = 0;
 235
 236         r->idiag_family       = tw->tw_family;
 237         r->idiag_retrans      = 0;
 238         r->id.idiag_if        = tw->tw_bound_dev_if;
 239         sock_diag_save_cookie(tw, r->id.idiag_cookie);
 240         r->id.idiag_sport     = tw->tw_sport;
 241         r->id.idiag_dport     = tw->tw_dport;
 242         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
 243         r->id.idiag_dst[0]    = tw->tw_daddr;
 244         r->idiag_state        = tw->tw_substate;
 245         r->idiag_timer        = 3;
 246         r->idiag_expires      = DIV_ROUND_UP(tmo * 1000, HZ);
 247         r->idiag_rqueue       = 0;
 248         r->idiag_wqueue       = 0;
 249         r->idiag_uid          = 0;
 250         r->idiag_inode        = 0;
 251 #if IS_ENABLED(CONFIG_IPV6)
 252         if (tw->tw_family == AF_INET6) {
 253                 const struct inet6_timewait_sock *tw6 =
 254                                                 inet6_twsk((struct sock *)tw);
 255
 256                 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
 257                 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
 258         }
 259 #endif
 260
 261         return nlmsg_end(skb, nlh);
 262 }
 263
 264 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 265                         struct inet_diag_req_v2 *r,
 266                         struct user_namespace *user_ns,
 267                         u32 portid, u32 seq, u16 nlmsg_flags,
 268                         const struct nlmsghdr *unlh)
 269 {
 270         if (sk->sk_state == TCP_TIME_WAIT)
 271                 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
 272                                            skb, r, portid, seq, nlmsg_flags,
 273                                            unlh);
 274         return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, nlmsg_flags, unlh);
 275 }
 276
 277 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
 278                 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
 279 {
 280         int err;
 281         struct sock *sk;
 282         struct sk_buff *rep;
 283         struct net *net = sock_net(in_skb->sk);
 284
 285         err = -EINVAL;
 286         if (req->sdiag_family == AF_INET) {
 287                 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
 288                                  req->id.idiag_dport, req->id.idiag_src[0],
 289                                  req->id.idiag_sport, req->id.idiag_if);
 290         }
 291 #if IS_ENABLED(CONFIG_IPV6)
 292         else if (req->sdiag_family == AF_INET6) {
 293                 sk = inet6_lookup(net, hashinfo,
 294                                   (struct in6_addr *)req->id.idiag_dst,
 295                                   req->id.idiag_dport,
 296                                   (struct in6_addr *)req->id.idiag_src,
 297                                   req->id.idiag_sport,
 298                                   req->id.idiag_if);
 299         }
 300 #endif
 301         else {
 302                 goto out_nosk;
 303         }
 304
 305         err = -ENOENT;
 306         if (sk == NULL)
 307                 goto out_nosk;
 308
 309         err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
 310         if (err)
 311                 goto out;
 312
 313         rep = nlmsg_new(sizeof(struct inet_diag_msg) +
 314                         sizeof(struct inet_diag_meminfo) +
 315                         sizeof(struct tcp_info) + 64, GFP_KERNEL);
 316         if (!rep) {
 317                 err = -ENOMEM;
 318                 goto out;
 319         }
 320
 321         err = sk_diag_fill(sk, rep, req,
 322                            sk_user_ns(NETLINK_CB(in_skb).ssk),
 323                            NETLINK_CB(in_skb).portid,
 324                            nlh->nlmsg_seq, 0, nlh);
 325         if (err < 0) {
 326                 WARN_ON(err == -EMSGSIZE);
 327                 nlmsg_free(rep);
 328                 goto out;
 329         }
 330         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 331                               MSG_DONTWAIT);
 332         if (err > 0)
 333                 err = 0;
 334
 335 out:
 336         if (sk) {
 337                 if (sk->sk_state == TCP_TIME_WAIT)
 338                         inet_twsk_put((struct inet_timewait_sock *)sk);
 339                 else
 340                         sock_put(sk);
 341         }
 342 out_nosk:
 343         return err;
 344 }
 345 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 346
 347 static int inet_diag_get_exact(struct sk_buff *in_skb,
 348                                const struct nlmsghdr *nlh,
 349                                struct inet_diag_req_v2 *req)
 350 {
 351         const struct inet_diag_handler *handler;
 352         int err;
 353
 354         handler = inet_diag_lock_handler(req->sdiag_protocol);
 355         if (IS_ERR(handler))
 356                 err = PTR_ERR(handler);
 357         else
 358                 err = handler->dump_one(in_skb, nlh, req);
 359         inet_diag_unlock_handler(handler);
 360
 361         return err;
 362 }
 363
 364 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 365 {
 366         int words = bits >> 5;
 367
 368         bits &= 0x1f;
 369
 370         if (words) {
 371                 if (memcmp(a1, a2, words << 2))
 372                         return 0;
 373         }
 374         if (bits) {
 375                 __be32 w1, w2;
 376                 __be32 mask;
 377
 378                 w1 = a1[words];
 379                 w2 = a2[words];
 380
 381                 mask = htonl((0xffffffff) << (32 - bits));
 382
 383                 if ((w1 ^ w2) & mask)
 384                         return 0;
 385         }
 386
 387         return 1;
 388 }
 389
 390
 391 static int inet_diag_bc_run(const struct nlattr *_bc,
 392                 const struct inet_diag_entry *entry)
 393 {
 394         const void *bc = nla_data(_bc);
 395         int len = nla_len(_bc);
 396
 397         while (len > 0) {
 398                 int yes = 1;
 399                 const struct inet_diag_bc_op *op = bc;
 400
 401                 switch (op->code) {
 402                 case INET_DIAG_BC_NOP:
 403                         break;
 404                 case INET_DIAG_BC_JMP:
 405                         yes = 0;
 406                         break;
 407                 case INET_DIAG_BC_S_GE:
 408                         yes = entry->sport >= op[1].no;
 409                         break;
 410                 case INET_DIAG_BC_S_LE:
 411                         yes = entry->sport <= op[1].no;
 412                         break;
 413                 case INET_DIAG_BC_D_GE:
 414                         yes = entry->dport >= op[1].no;
 415                         break;
 416                 case INET_DIAG_BC_D_LE:
 417                         yes = entry->dport <= op[1].no;
 418                         break;
 419                 case INET_DIAG_BC_AUTO:
 420                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 421                         break;
 422                 case INET_DIAG_BC_S_COND:
 423                 case INET_DIAG_BC_D_COND: {
 424                         struct inet_diag_hostcond *cond;
 425                         __be32 *addr;
 426
 427                         cond = (struct inet_diag_hostcond *)(op + 1);
 428                         if (cond->port != -1 &&
 429                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 430                                              entry->sport : entry->dport)) {
 431                                 yes = 0;
 432                                 break;
 433                         }
 434
 435                         if (op->code == INET_DIAG_BC_S_COND)
 436                                 addr = entry->saddr;
 437                         else
 438                                 addr = entry->daddr;
 439
 440                         if (cond->family != AF_UNSPEC &&
 441                             cond->family != entry->family) {
 442                                 if (entry->family == AF_INET6 &&
 443                                     cond->family == AF_INET) {
 444                                         if (addr[0] == 0 && addr[1] == 0 &&
 445                                             addr[2] == htonl(0xffff) &&
 446                                             bitstring_match(addr + 3,
 447                                                             cond->addr,
 448                                                             cond->prefix_len))
 449                                                 break;
 450                                 }
 451                                 yes = 0;
 452                                 break;
 453                         }
 454
 455                         if (cond->prefix_len == 0)
 456                                 break;
 457                         if (bitstring_match(addr, cond->addr,
 458                                             cond->prefix_len))
 459                                 break;
 460                         yes = 0;
 461                         break;
 462                 }
 463                 }
 464
 465                 if (yes) {
 466                         len -= op->yes;
 467                         bc += op->yes;
 468                 } else {
 469                         len -= op->no;
 470                         bc += op->no;
 471                 }
 472         }
 473         return len == 0;
 474 }
 475
 476 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 477 {
 478         struct inet_diag_entry entry;
 479         struct inet_sock *inet = inet_sk(sk);
 480
 481         if (bc == NULL)
 482                 return 1;
 483
 484         entry.family = sk->sk_family;
 485 #if IS_ENABLED(CONFIG_IPV6)
 486         if (entry.family == AF_INET6) {
 487                 struct ipv6_pinfo *np = inet6_sk(sk);
 488
 489                 entry.saddr = np->rcv_saddr.s6_addr32;
 490                 entry.daddr = np->daddr.s6_addr32;
 491         } else
 492 #endif
 493         {
 494                 entry.saddr = &inet->inet_rcv_saddr;
 495                 entry.daddr = &inet->inet_daddr;
 496         }
 497         entry.sport = inet->inet_num;
 498         entry.dport = ntohs(inet->inet_dport);
 499         entry.userlocks = sk->sk_userlocks;
 500
 501         return inet_diag_bc_run(bc, &entry);
 502 }
 503 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 504
 505 static int valid_cc(const void *bc, int len, int cc)
 506 {
 507         while (len >= 0) {
 508                 const struct inet_diag_bc_op *op = bc;
 509
 510                 if (cc > len)
 511                         return 0;
 512                 if (cc == len)
 513                         return 1;
 514                 if (op->yes < 4 || op->yes & 3)
 515                         return 0;
 516                 len -= op->yes;
 517                 bc  += op->yes;
 518         }
 519         return 0;
 520 }
 521
 522 /* Validate an inet_diag_hostcond. */
 523 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
 524                            int *min_len)
 525 {
 526         int addr_len;
 527         struct inet_diag_hostcond *cond;
 528
 529         /* Check hostcond space. */
 530         *min_len += sizeof(struct inet_diag_hostcond);
 531         if (len < *min_len)
 532                 return false;
 533         cond = (struct inet_diag_hostcond *)(op + 1);
 534
 535         /* Check address family and address length. */
 536         switch (cond->family) {
 537         case AF_UNSPEC:
 538                 addr_len = 0;
 539                 break;
 540         case AF_INET:
 541                 addr_len = sizeof(struct in_addr);
 542                 break;
 543         case AF_INET6:
 544                 addr_len = sizeof(struct in6_addr);
 545                 break;
 546         default:
 547                 return false;
 548         }
 549         *min_len += addr_len;
 550         if (len < *min_len)
 551                 return false;
 552
 553         /* Check prefix length (in bits) vs address length (in bytes). */
 554         if (cond->prefix_len > 8 * addr_len)
 555                 return false;
 556
 557         return true;
 558 }
 559
 560 /* Validate a port comparison operator. */
 561 static inline bool valid_port_comparison(const struct inet_diag_bc_op *op,
 562                                          int len, int *min_len)
 563 {
 564         /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
 565         *min_len += sizeof(struct inet_diag_bc_op);
 566         if (len < *min_len)
 567                 return false;
 568         return true;
 569 }
 570
 571 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 572 {
 573         const void *bc = bytecode;
 574         int  len = bytecode_len;
 575
 576         while (len > 0) {
 577                 const struct inet_diag_bc_op *op = bc;
 578                 int min_len = sizeof(struct inet_diag_bc_op);
 579
 580 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 581                 switch (op->code) {
 582                 case INET_DIAG_BC_S_COND:
 583                 case INET_DIAG_BC_D_COND:
 584                         if (!valid_hostcond(bc, len, &min_len))
 585                                 return -EINVAL;
 586                         break;
 587                 case INET_DIAG_BC_S_GE:
 588                 case INET_DIAG_BC_S_LE:
 589                 case INET_DIAG_BC_D_GE:
 590                 case INET_DIAG_BC_D_LE:
 591                         if (!valid_port_comparison(bc, len, &min_len))
 592                                 return -EINVAL;
 593                         break;
 594                 case INET_DIAG_BC_AUTO:
 595                 case INET_DIAG_BC_JMP:
 596                 case INET_DIAG_BC_NOP:
 597                         break;
 598                 default:
 599                         return -EINVAL;
 600                 }
 601
 602                 if (op->code != INET_DIAG_BC_NOP) {
 603                         if (op->no < min_len || op->no > len + 4 || op->no & 3)
 604                                 return -EINVAL;
 605                         if (op->no < len &&
 606                             !valid_cc(bytecode, bytecode_len, len - op->no))
 607                                 return -EINVAL;
 608                 }
 609
 610                 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
 611                         return -EINVAL;
 612                 bc  += op->yes;
 613                 len -= op->yes;
 614         }
 615         return len == 0 ? 0 : -EINVAL;
 616 }
 617
 618 static int inet_csk_diag_dump(struct sock *sk,
 619                               struct sk_buff *skb,
 620                               struct netlink_callback *cb,
 621                               struct inet_diag_req_v2 *r,
 622                               const struct nlattr *bc)
 623 {
 624         if (!inet_diag_bc_sk(bc, sk))
 625                 return 0;
 626
 627         return inet_csk_diag_fill(sk, skb, r,
 628                                   sk_user_ns(NETLINK_CB(cb->skb).ssk),
 629                                   NETLINK_CB(cb->skb).portid,
 630                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 631 }
 632
 633 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
 634                                struct sk_buff *skb,
 635                                struct netlink_callback *cb,
 636                                struct inet_diag_req_v2 *r,
 637                                const struct nlattr *bc)
 638 {
 639         if (bc != NULL) {
 640                 struct inet_diag_entry entry;
 641
 642                 entry.family = tw->tw_family;
 643 #if IS_ENABLED(CONFIG_IPV6)
 644                 if (tw->tw_family == AF_INET6) {
 645                         struct inet6_timewait_sock *tw6 =
 646                                                 inet6_twsk((struct sock *)tw);
 647                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
 648                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
 649                 } else
 650 #endif
 651                 {
 652                         entry.saddr = &tw->tw_rcv_saddr;
 653                         entry.daddr = &tw->tw_daddr;
 654                 }
 655                 entry.sport = tw->tw_num;
 656                 entry.dport = ntohs(tw->tw_dport);
 657                 entry.userlocks = 0;
 658
 659                 if (!inet_diag_bc_run(bc, &entry))
 660                         return 0;
 661         }
 662
 663         return inet_twsk_diag_fill(tw, skb, r,
 664                                    NETLINK_CB(cb->skb).portid,
 665                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 666 }
 667
 668 /* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses
 669  * from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6.
 670  */
 671 static inline void inet_diag_req_addrs(const struct sock *sk,
 672                                        const struct request_sock *req,
 673                                        struct inet_diag_entry *entry)
 674 {
 675         struct inet_request_sock *ireq = inet_rsk(req);
 676
 677 #if IS_ENABLED(CONFIG_IPV6)
 678         if (sk->sk_family == AF_INET6) {
 679                 if (req->rsk_ops->family == AF_INET6) {
 680                         entry->saddr = inet6_rsk(req)->loc_addr.s6_addr32;
 681                         entry->daddr = inet6_rsk(req)->rmt_addr.s6_addr32;
 682                 } else if (req->rsk_ops->family == AF_INET) {
 683                         ipv6_addr_set_v4mapped(ireq->loc_addr,
 684                                                &entry->saddr_storage);
 685                         ipv6_addr_set_v4mapped(ireq->rmt_addr,
 686                                                &entry->daddr_storage);
 687                         entry->saddr = entry->saddr_storage.s6_addr32;
 688                         entry->daddr = entry->daddr_storage.s6_addr32;
 689                 }
 690         } else
 691 #endif
 692         {
 693                 entry->saddr = &ireq->loc_addr;
 694                 entry->daddr = &ireq->rmt_addr;
 695         }
 696 }
 697
 698 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 699                               struct request_sock *req,
 700                               struct user_namespace *user_ns,
 701                               u32 portid, u32 seq,
 702                               const struct nlmsghdr *unlh)
 703 {
 704         const struct inet_request_sock *ireq = inet_rsk(req);
 705         struct inet_sock *inet = inet_sk(sk);
 706         struct inet_diag_msg *r;
 707         struct nlmsghdr *nlh;
 708         long tmo;
 709
 710         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 711                         NLM_F_MULTI);
 712         if (!nlh)
 713                 return -EMSGSIZE;
 714
 715         r = nlmsg_data(nlh);
 716         r->idiag_family = sk->sk_family;
 717         r->idiag_state = TCP_SYN_RECV;
 718         r->idiag_timer = 1;
 719         r->idiag_retrans = req->retrans;
 720
 721         r->id.idiag_if = sk->sk_bound_dev_if;
 722         sock_diag_save_cookie(req, r->id.idiag_cookie);
 723
 724         tmo = req->expires - jiffies;
 725         if (tmo < 0)
 726                 tmo = 0;
 727
 728         r->id.idiag_sport = inet->inet_sport;
 729         r->id.idiag_dport = ireq->rmt_port;
 730         r->id.idiag_src[0] = ireq->loc_addr;
 731         r->id.idiag_dst[0] = ireq->rmt_addr;
 732         r->idiag_expires = jiffies_to_msecs(tmo);
 733         r->idiag_rqueue = 0;
 734         r->idiag_wqueue = 0;
 735         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 736         r->idiag_inode = 0;
 737 #if IS_ENABLED(CONFIG_IPV6)
 738         if (r->idiag_family == AF_INET6) {
 739                 struct inet_diag_entry entry;
 740                 inet_diag_req_addrs(sk, req, &entry);
 741                 memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr));
 742                 memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr));
 743         }
 744 #endif
 745
 746         return nlmsg_end(skb, nlh);
 747 }
 748
 749 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 750                                struct netlink_callback *cb,
 751                                struct inet_diag_req_v2 *r,
 752                                const struct nlattr *bc)
 753 {
 754         struct inet_diag_entry entry;
 755         struct inet_connection_sock *icsk = inet_csk(sk);
 756         struct listen_sock *lopt;
 757         struct inet_sock *inet = inet_sk(sk);
 758         int j, s_j;
 759         int reqnum, s_reqnum;
 760         int err = 0;
 761
 762         s_j = cb->args[3];
 763         s_reqnum = cb->args[4];
 764
 765         if (s_j > 0)
 766                 s_j--;
 767
 768         entry.family = sk->sk_family;
 769
 770         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 771
 772         lopt = icsk->icsk_accept_queue.listen_opt;
 773         if (!lopt || !lopt->qlen)
 774                 goto out;
 775
 776         if (bc != NULL) {
 777                 entry.sport = inet->inet_num;
 778                 entry.userlocks = sk->sk_userlocks;
 779         }
 780
 781         for (j = s_j; j < lopt->nr_table_entries; j++) {
 782                 struct request_sock *req, *head = lopt->syn_table[j];
 783
 784                 reqnum = 0;
 785                 for (req = head; req; reqnum++, req = req->dl_next) {
 786                         struct inet_request_sock *ireq = inet_rsk(req);
 787
 788                         if (reqnum < s_reqnum)
 789                                 continue;
 790                         if (r->id.idiag_dport != ireq->rmt_port &&
 791                             r->id.idiag_dport)
 792                                 continue;
 793
 794                         if (bc) {
 795                                 inet_diag_req_addrs(sk, req, &entry);
 796                                 entry.dport = ntohs(ireq->rmt_port);
 797
 798                                 if (!inet_diag_bc_run(bc, &entry))
 799                                         continue;
 800                         }
 801
 802                         err = inet_diag_fill_req(skb, sk, req,
 803                                                sk_user_ns(NETLINK_CB(cb->skb).ssk),
 804                                                NETLINK_CB(cb->skb).portid,
 805                                                cb->nlh->nlmsg_seq, cb->nlh);
 806                         if (err < 0) {
 807                                 cb->args[3] = j + 1;
 808                                 cb->args[4] = reqnum;
 809                                 goto out;
 810                         }
 811                 }
 812
 813                 s_reqnum = 0;
 814         }
 815
 816 out:
 817         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 818
 819         return err;
 820 }
 821
 822 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 823                 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
 824 {
 825         int i, num;
 826         int s_i, s_num;
 827         struct net *net = sock_net(skb->sk);
 828
 829         s_i = cb->args[1];
 830         s_num = num = cb->args[2];
 831
 832         if (cb->args[0] == 0) {
 833                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 834                         goto skip_listen_ht;
 835
 836                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 837                         struct sock *sk;
 838                         struct hlist_nulls_node *node;
 839                         struct inet_listen_hashbucket *ilb;
 840
 841                         num = 0;
 842                         ilb = &hashinfo->listening_hash[i];
 843                         spin_lock_bh(&ilb->lock);
 844                         sk_nulls_for_each(sk, node, &ilb->head) {
 845                                 struct inet_sock *inet = inet_sk(sk);
 846
 847                                 if (!net_eq(sock_net(sk), net))
 848                                         continue;
 849
 850                                 if (num < s_num) {
 851                                         num++;
 852                                         continue;
 853                                 }
 854
 855                                 if (r->sdiag_family != AF_UNSPEC &&
 856                                                 sk->sk_family != r->sdiag_family)
 857                                         goto next_listen;
 858
 859                                 if (r->id.idiag_sport != inet->inet_sport &&
 860                                     r->id.idiag_sport)
 861                                         goto next_listen;
 862
 863                                 if (!(r->idiag_states & TCPF_LISTEN) ||
 864                                     r->id.idiag_dport ||
 865                                     cb->args[3] > 0)
 866                                         goto syn_recv;
 867
 868                                 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 869                                         spin_unlock_bh(&ilb->lock);
 870                                         goto done;
 871                                 }
 872
 873 syn_recv:
 874                                 if (!(r->idiag_states & TCPF_SYN_RECV))
 875                                         goto next_listen;
 876
 877                                 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
 878                                         spin_unlock_bh(&ilb->lock);
 879                                         goto done;
 880                                 }
 881
 882 next_listen:
 883                                 cb->args[3] = 0;
 884                                 cb->args[4] = 0;
 885                                 ++num;
 886                         }
 887                         spin_unlock_bh(&ilb->lock);
 888
 889                         s_num = 0;
 890                         cb->args[3] = 0;
 891                         cb->args[4] = 0;
 892                 }
 893 skip_listen_ht:
 894                 cb->args[0] = 1;
 895                 s_i = num = s_num = 0;
 896         }
 897
 898         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
 899                 goto out;
 900
 901         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
 902                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 903                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
 904                 struct sock *sk;
 905                 struct hlist_nulls_node *node;
 906
 907                 num = 0;
 908
 909                 if (hlist_nulls_empty(&head->chain) &&
 910                         hlist_nulls_empty(&head->twchain))
 911                         continue;
 912
 913                 if (i > s_i)
 914                         s_num = 0;
 915
 916                 spin_lock_bh(lock);
 917                 sk_nulls_for_each(sk, node, &head->chain) {
 918                         struct inet_sock *inet = inet_sk(sk);
 919
 920                         if (!net_eq(sock_net(sk), net))
 921                                 continue;
 922                         if (num < s_num)
 923                                 goto next_normal;
 924                         if (!(r->idiag_states & (1 << sk->sk_state)))
 925                                 goto next_normal;
 926                         if (r->sdiag_family != AF_UNSPEC &&
 927                                         sk->sk_family != r->sdiag_family)
 928                                 goto next_normal;
 929                         if (r->id.idiag_sport != inet->inet_sport &&
 930                             r->id.idiag_sport)
 931                                 goto next_normal;
 932                         if (r->id.idiag_dport != inet->inet_dport &&
 933                             r->id.idiag_dport)
 934                                 goto next_normal;
 935                         if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 936                                 spin_unlock_bh(lock);
 937                                 goto done;
 938                         }
 939 next_normal:
 940                         ++num;
 941                 }
 942
 943                 if (r->idiag_states & TCPF_TIME_WAIT) {
 944                         struct inet_timewait_sock *tw;
 945
 946                         inet_twsk_for_each(tw, node,
 947                                     &head->twchain) {
 948                                 if (!net_eq(twsk_net(tw), net))
 949                                         continue;
 950
 951                                 if (num < s_num)
 952                                         goto next_dying;
 953                                 if (r->sdiag_family != AF_UNSPEC &&
 954                                                 tw->tw_family != r->sdiag_family)
 955                                         goto next_dying;
 956                                 if (r->id.idiag_sport != tw->tw_sport &&
 957                                     r->id.idiag_sport)
 958                                         goto next_dying;
 959                                 if (r->id.idiag_dport != tw->tw_dport &&
 960                                     r->id.idiag_dport)
 961                                         goto next_dying;
 962                                 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
 963                                         spin_unlock_bh(lock);
 964                                         goto done;
 965                                 }
 966 next_dying:
 967                                 ++num;
 968                         }
 969                 }
 970                 spin_unlock_bh(lock);
 971         }
 972
 973 done:
 974         cb->args[1] = i;
 975         cb->args[2] = num;
 976 out:
 977         ;
 978 }
 979 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
 980
 981 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 982                 struct inet_diag_req_v2 *r, struct nlattr *bc)
 983 {
 984         const struct inet_diag_handler *handler;
 985         int err = 0;
 986
 987         handler = inet_diag_lock_handler(r->sdiag_protocol);
 988         if (!IS_ERR(handler))
 989                 handler->dump(skb, cb, r, bc);
 990         else
 991                 err = PTR_ERR(handler);
 992         inet_diag_unlock_handler(handler);
 993
 994         return err ? : skb->len;
 995 }
 996
 997 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 998 {
 999         struct nlattr *bc = NULL;
1000         int hdrlen = sizeof(struct inet_diag_req_v2);
1001
1002         if (nlmsg_attrlen(cb->nlh, hdrlen))
1003                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1004
1005         return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1006 }
1007
1008 static inline int inet_diag_type2proto(int type)
1009 {
1010         switch (type) {
1011         case TCPDIAG_GETSOCK:
1012                 return IPPROTO_TCP;
1013         case DCCPDIAG_GETSOCK:
1014                 return IPPROTO_DCCP;
1015         default:
1016                 return 0;
1017         }
1018 }
1019
1020 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
1021 {
1022         struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1023         struct inet_diag_req_v2 req;
1024         struct nlattr *bc = NULL;
1025         int hdrlen = sizeof(struct inet_diag_req);
1026
1027         req.sdiag_family = AF_UNSPEC; /* compatibility */
1028         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1029         req.idiag_ext = rc->idiag_ext;
1030         req.idiag_states = rc->idiag_states;
1031         req.id = rc->id;
1032
1033         if (nlmsg_attrlen(cb->nlh, hdrlen))
1034                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1035
1036         return __inet_diag_dump(skb, cb, &req, bc);
1037 }
1038
1039 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1040                                const struct nlmsghdr *nlh)
1041 {
1042         struct inet_diag_req *rc = nlmsg_data(nlh);
1043         struct inet_diag_req_v2 req;
1044
1045         req.sdiag_family = rc->idiag_family;
1046         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1047         req.idiag_ext = rc->idiag_ext;
1048         req.idiag_states = rc->idiag_states;
1049         req.id = rc->id;
1050
1051         return inet_diag_get_exact(in_skb, nlh, &req);
1052 }
1053
1054 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1055 {
1056         int hdrlen = sizeof(struct inet_diag_req);
1057         struct net *net = sock_net(skb->sk);
1058
1059         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1060             nlmsg_len(nlh) < hdrlen)
1061                 return -EINVAL;
1062
1063         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1064                 if (nlmsg_attrlen(nlh, hdrlen)) {
1065                         struct nlattr *attr;
1066
1067                         attr = nlmsg_find_attr(nlh, hdrlen,
1068                                                INET_DIAG_REQ_BYTECODE);
1069                         if (attr == NULL ||
1070                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1071                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1072                                 return -EINVAL;
1073                 }
1074                 {
1075                         struct netlink_dump_control c = {
1076                                 .dump = inet_diag_dump_compat,
1077                         };
1078                         return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1079                 }
1080         }
1081
1082         return inet_diag_get_exact_compat(skb, nlh);
1083 }
1084
1085 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1086 {
1087         int hdrlen = sizeof(struct inet_diag_req_v2);
1088         struct net *net = sock_net(skb->sk);
1089
1090         if (nlmsg_len(h) < hdrlen)
1091                 return -EINVAL;
1092
1093         if (h->nlmsg_flags & NLM_F_DUMP) {
1094                 if (nlmsg_attrlen(h, hdrlen)) {
1095                         struct nlattr *attr;
1096                         attr = nlmsg_find_attr(h, hdrlen,
1097                                                INET_DIAG_REQ_BYTECODE);
1098                         if (attr == NULL ||
1099                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1100                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1101                                 return -EINVAL;
1102                 }
1103                 {
1104                         struct netlink_dump_control c = {
1105                                 .dump = inet_diag_dump,
1106                         };
1107                         return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1108                 }
1109         }
1110
1111         return inet_diag_get_exact(skb, h, nlmsg_data(h));
1112 }
1113
1114 static const struct sock_diag_handler inet_diag_handler = {
1115         .family = AF_INET,
1116         .dump = inet_diag_handler_dump,
1117 };
1118
1119 static const struct sock_diag_handler inet6_diag_handler = {
1120         .family = AF_INET6,
1121         .dump = inet_diag_handler_dump,
1122 };
1123
1124 int inet_diag_register(const struct inet_diag_handler *h)
1125 {
1126         const __u16 type = h->idiag_type;
1127         int err = -EINVAL;
1128
1129         if (type >= IPPROTO_MAX)
1130                 goto out;
1131
1132         mutex_lock(&inet_diag_table_mutex);
1133         err = -EEXIST;
1134         if (inet_diag_table[type] == NULL) {
1135                 inet_diag_table[type] = h;
1136                 err = 0;
1137         }
1138         mutex_unlock(&inet_diag_table_mutex);
1139 out:
1140         return err;
1141 }
1142 EXPORT_SYMBOL_GPL(inet_diag_register);
1143
1144 void inet_diag_unregister(const struct inet_diag_handler *h)
1145 {
1146         const __u16 type = h->idiag_type;
1147
1148         if (type >= IPPROTO_MAX)
1149                 return;
1150
1151         mutex_lock(&inet_diag_table_mutex);
1152         inet_diag_table[type] = NULL;
1153         mutex_unlock(&inet_diag_table_mutex);
1154 }
1155 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1156
1157 static int __init inet_diag_init(void)
1158 {
1159         const int inet_diag_table_size = (IPPROTO_MAX *
1160                                           sizeof(struct inet_diag_handler *));
1161         int err = -ENOMEM;
1162
1163         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1164         if (!inet_diag_table)
1165                 goto out;
1166
1167         err = sock_diag_register(&inet_diag_handler);
1168         if (err)
1169                 goto out_free_nl;
1170
1171         err = sock_diag_register(&inet6_diag_handler);
1172         if (err)
1173                 goto out_free_inet;
1174
1175         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1176 out:
1177         return err;
1178
1179 out_free_inet:
1180         sock_diag_unregister(&inet_diag_handler);
1181 out_free_nl:
1182         kfree(inet_diag_table);
1183         goto out;
1184 }
1185
1186 static void __exit inet_diag_exit(void)
1187 {
1188         sock_diag_unregister(&inet6_diag_handler);
1189         sock_diag_unregister(&inet_diag_handler);
1190         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1191         kfree(inet_diag_table);
1192 }
1193
1194 module_init(inet_diag_init);
1195 module_exit(inet_diag_exit);
1196 MODULE_LICENSE("GPL");
1197 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1198 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);