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 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown)) 113 goto errout; 114 115 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, 116 * hence this needs to be included regardless of socket family. 117 */ 118 if (ext & (1 << (INET_DIAG_TOS - 1))) 119 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0) 120 goto errout; 121 122 #if IS_ENABLED(CONFIG_IPV6) 123 if (r->idiag_family == AF_INET6) { 124 125 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr; 126 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr; 127 128 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 129 if (nla_put_u8(skb, INET_DIAG_TCLASS, 130 inet6_sk(sk)->tclass) < 0) 131 goto errout; 132 } 133 #endif 134 135 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); 136 r->idiag_inode = sock_i_ino(sk); 137 138 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) { 139 struct inet_diag_meminfo minfo = { 140 .idiag_rmem = sk_rmem_alloc_get(sk), 141 .idiag_wmem = sk->sk_wmem_queued, 142 .idiag_fmem = sk->sk_forward_alloc, 143 .idiag_tmem = sk_wmem_alloc_get(sk), 144 }; 145 146 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0) 147 goto errout; 148 } 149 150 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) 151 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO)) 152 goto errout; 153 154 if (icsk == NULL) { 155 handler->idiag_get_info(sk, r, NULL); 156 goto out; 157 } 158 159 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) 160 161 if (icsk->icsk_pending == ICSK_TIME_RETRANS || 162 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS || 163 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { 164 r->idiag_timer = 1; 165 r->idiag_retrans = icsk->icsk_retransmits; 166 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 167 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 168 r->idiag_timer = 4; 169 r->idiag_retrans = icsk->icsk_probes_out; 170 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 171 } else if (timer_pending(&sk->sk_timer)) { 172 r->idiag_timer = 2; 173 r->idiag_retrans = icsk->icsk_probes_out; 174 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 175 } else { 176 r->idiag_timer = 0; 177 r->idiag_expires = 0; 178 } 179 #undef EXPIRES_IN_MS 180 181 if (ext & (1 << (INET_DIAG_INFO - 1))) { 182 attr = nla_reserve(skb, INET_DIAG_INFO, 183 sizeof(struct tcp_info)); 184 if (!attr) 185 goto errout; 186 187 info = nla_data(attr); 188 } 189 190 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) 191 if (nla_put_string(skb, INET_DIAG_CONG, 192 icsk->icsk_ca_ops->name) < 0) 193 goto errout; 194 195 handler->idiag_get_info(sk, r, info); 196 197 if (sk->sk_state < TCP_TIME_WAIT && 198 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 199 icsk->icsk_ca_ops->get_info(sk, ext, skb); 200 201 out: 202 return nlmsg_end(skb, nlh); 203 204 errout: 205 nlmsg_cancel(skb, nlh); 206 return -EMSGSIZE; 207 } 208 EXPORT_SYMBOL_GPL(inet_sk_diag_fill); 209 210 static int inet_csk_diag_fill(struct sock *sk, 211 struct sk_buff *skb, struct inet_diag_req_v2 *req, 212 struct user_namespace *user_ns, 213 u32 portid, u32 seq, u16 nlmsg_flags, 214 const struct nlmsghdr *unlh) 215 { 216 return inet_sk_diag_fill(sk, inet_csk(sk), 217 skb, req, user_ns, portid, seq, nlmsg_flags, unlh); 218 } 219 220 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 221 struct sk_buff *skb, struct inet_diag_req_v2 *req, 222 u32 portid, u32 seq, u16 nlmsg_flags, 223 const struct nlmsghdr *unlh) 224 { 225 s32 tmo; 226 struct inet_diag_msg *r; 227 struct nlmsghdr *nlh; 228 229 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 230 nlmsg_flags); 231 if (!nlh) 232 return -EMSGSIZE; 233 234 r = nlmsg_data(nlh); 235 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 236 237 tmo = tw->tw_ttd - inet_tw_time_stamp(); 238 if (tmo < 0) 239 tmo = 0; 240 241 r->idiag_family = tw->tw_family; 242 r->idiag_retrans = 0; 243 r->id.idiag_if = tw->tw_bound_dev_if; 244 sock_diag_save_cookie(tw, r->id.idiag_cookie); 245 r->id.idiag_sport = tw->tw_sport; 246 r->id.idiag_dport = tw->tw_dport; 247 r->id.idiag_src[0] = tw->tw_rcv_saddr; 248 r->id.idiag_dst[0] = tw->tw_daddr; 249 r->idiag_state = tw->tw_substate; 250 r->idiag_timer = 3; 251 r->idiag_expires = jiffies_to_msecs(tmo); 252 r->idiag_rqueue = 0; 253 r->idiag_wqueue = 0; 254 r->idiag_uid = 0; 255 r->idiag_inode = 0; 256 #if IS_ENABLED(CONFIG_IPV6) 257 if (tw->tw_family == AF_INET6) { 258 *(struct in6_addr *)r->id.idiag_src = tw->tw_v6_rcv_saddr; 259 *(struct in6_addr *)r->id.idiag_dst = tw->tw_v6_daddr; 260 } 261 #endif 262 263 return nlmsg_end(skb, nlh); 264 } 265 266 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 267 struct inet_diag_req_v2 *r, 268 struct user_namespace *user_ns, 269 u32 portid, u32 seq, u16 nlmsg_flags, 270 const struct nlmsghdr *unlh) 271 { 272 if (sk->sk_state == TCP_TIME_WAIT) 273 return inet_twsk_diag_fill(inet_twsk(sk), skb, r, portid, seq, 274 nlmsg_flags, unlh); 275 276 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, 277 nlmsg_flags, unlh); 278 } 279 280 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb, 281 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req) 282 { 283 int err; 284 struct sock *sk; 285 struct sk_buff *rep; 286 struct net *net = sock_net(in_skb->sk); 287 288 err = -EINVAL; 289 if (req->sdiag_family == AF_INET) { 290 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0], 291 req->id.idiag_dport, req->id.idiag_src[0], 292 req->id.idiag_sport, req->id.idiag_if); 293 } 294 #if IS_ENABLED(CONFIG_IPV6) 295 else if (req->sdiag_family == AF_INET6) { 296 sk = inet6_lookup(net, hashinfo, 297 (struct in6_addr *)req->id.idiag_dst, 298 req->id.idiag_dport, 299 (struct in6_addr *)req->id.idiag_src, 300 req->id.idiag_sport, 301 req->id.idiag_if); 302 } 303 #endif 304 else { 305 goto out_nosk; 306 } 307 308 err = -ENOENT; 309 if (sk == NULL) 310 goto out_nosk; 311 312 err = sock_diag_check_cookie(sk, req->id.idiag_cookie); 313 if (err) 314 goto out; 315 316 rep = nlmsg_new(sizeof(struct inet_diag_msg) + 317 sizeof(struct inet_diag_meminfo) + 318 sizeof(struct tcp_info) + 64, GFP_KERNEL); 319 if (!rep) { 320 err = -ENOMEM; 321 goto out; 322 } 323 324 err = sk_diag_fill(sk, rep, req, 325 sk_user_ns(NETLINK_CB(in_skb).sk), 326 NETLINK_CB(in_skb).portid, 327 nlh->nlmsg_seq, 0, nlh); 328 if (err < 0) { 329 WARN_ON(err == -EMSGSIZE); 330 nlmsg_free(rep); 331 goto out; 332 } 333 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid, 334 MSG_DONTWAIT); 335 if (err > 0) 336 err = 0; 337 338 out: 339 if (sk) 340 sock_gen_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) { 487 488 entry.saddr = sk->sk_v6_rcv_saddr.s6_addr32; 489 entry.daddr = sk->sk_v6_daddr.s6_addr32; 490 } else 491 #endif 492 { 493 entry.saddr = &inet->inet_rcv_saddr; 494 entry.daddr = &inet->inet_daddr; 495 } 496 entry.sport = inet->inet_num; 497 entry.dport = ntohs(inet->inet_dport); 498 entry.userlocks = sk->sk_userlocks; 499 500 return inet_diag_bc_run(bc, &entry); 501 } 502 EXPORT_SYMBOL_GPL(inet_diag_bc_sk); 503 504 static int valid_cc(const void *bc, int len, int cc) 505 { 506 while (len >= 0) { 507 const struct inet_diag_bc_op *op = bc; 508 509 if (cc > len) 510 return 0; 511 if (cc == len) 512 return 1; 513 if (op->yes < 4 || op->yes & 3) 514 return 0; 515 len -= op->yes; 516 bc += op->yes; 517 } 518 return 0; 519 } 520 521 /* Validate an inet_diag_hostcond. */ 522 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len, 523 int *min_len) 524 { 525 int addr_len; 526 struct inet_diag_hostcond *cond; 527 528 /* Check hostcond space. */ 529 *min_len += sizeof(struct inet_diag_hostcond); 530 if (len < *min_len) 531 return false; 532 cond = (struct inet_diag_hostcond *)(op + 1); 533 534 /* Check address family and address length. */ 535 switch (cond->family) { 536 case AF_UNSPEC: 537 addr_len = 0; 538 break; 539 case AF_INET: 540 addr_len = sizeof(struct in_addr); 541 break; 542 case AF_INET6: 543 addr_len = sizeof(struct in6_addr); 544 break; 545 default: 546 return false; 547 } 548 *min_len += addr_len; 549 if (len < *min_len) 550 return false; 551 552 /* Check prefix length (in bits) vs address length (in bytes). */ 553 if (cond->prefix_len > 8 * addr_len) 554 return false; 555 556 return true; 557 } 558 559 /* Validate a port comparison operator. */ 560 static inline bool valid_port_comparison(const struct inet_diag_bc_op *op, 561 int len, int *min_len) 562 { 563 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */ 564 *min_len += sizeof(struct inet_diag_bc_op); 565 if (len < *min_len) 566 return false; 567 return true; 568 } 569 570 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 571 { 572 const void *bc = bytecode; 573 int len = bytecode_len; 574 575 while (len > 0) { 576 const struct inet_diag_bc_op *op = bc; 577 int min_len = sizeof(struct inet_diag_bc_op); 578 579 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 580 switch (op->code) { 581 case INET_DIAG_BC_S_COND: 582 case INET_DIAG_BC_D_COND: 583 if (!valid_hostcond(bc, len, &min_len)) 584 return -EINVAL; 585 break; 586 case INET_DIAG_BC_S_GE: 587 case INET_DIAG_BC_S_LE: 588 case INET_DIAG_BC_D_GE: 589 case INET_DIAG_BC_D_LE: 590 if (!valid_port_comparison(bc, len, &min_len)) 591 return -EINVAL; 592 break; 593 case INET_DIAG_BC_AUTO: 594 case INET_DIAG_BC_JMP: 595 case INET_DIAG_BC_NOP: 596 break; 597 default: 598 return -EINVAL; 599 } 600 601 if (op->code != INET_DIAG_BC_NOP) { 602 if (op->no < min_len || op->no > len + 4 || op->no & 3) 603 return -EINVAL; 604 if (op->no < len && 605 !valid_cc(bytecode, bytecode_len, len - op->no)) 606 return -EINVAL; 607 } 608 609 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3) 610 return -EINVAL; 611 bc += op->yes; 612 len -= op->yes; 613 } 614 return len == 0 ? 0 : -EINVAL; 615 } 616 617 static int inet_csk_diag_dump(struct sock *sk, 618 struct sk_buff *skb, 619 struct netlink_callback *cb, 620 struct inet_diag_req_v2 *r, 621 const struct nlattr *bc) 622 { 623 if (!inet_diag_bc_sk(bc, sk)) 624 return 0; 625 626 return inet_csk_diag_fill(sk, skb, r, 627 sk_user_ns(NETLINK_CB(cb->skb).sk), 628 NETLINK_CB(cb->skb).portid, 629 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 630 } 631 632 static int inet_twsk_diag_dump(struct sock *sk, 633 struct sk_buff *skb, 634 struct netlink_callback *cb, 635 struct inet_diag_req_v2 *r, 636 const struct nlattr *bc) 637 { 638 struct inet_timewait_sock *tw = inet_twsk(sk); 639 640 if (bc != NULL) { 641 struct inet_diag_entry entry; 642 643 entry.family = tw->tw_family; 644 #if IS_ENABLED(CONFIG_IPV6) 645 if (tw->tw_family == AF_INET6) { 646 entry.saddr = tw->tw_v6_rcv_saddr.s6_addr32; 647 entry.daddr = tw->tw_v6_daddr.s6_addr32; 648 } else 649 #endif 650 { 651 entry.saddr = &tw->tw_rcv_saddr; 652 entry.daddr = &tw->tw_daddr; 653 } 654 entry.sport = tw->tw_num; 655 entry.dport = ntohs(tw->tw_dport); 656 entry.userlocks = 0; 657 658 if (!inet_diag_bc_run(bc, &entry)) 659 return 0; 660 } 661 662 return inet_twsk_diag_fill(tw, skb, r, 663 NETLINK_CB(cb->skb).portid, 664 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 665 } 666 667 /* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses 668 * from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6. 669 */ 670 static inline void inet_diag_req_addrs(const struct sock *sk, 671 const struct request_sock *req, 672 struct inet_diag_entry *entry) 673 { 674 struct inet_request_sock *ireq = inet_rsk(req); 675 676 #if IS_ENABLED(CONFIG_IPV6) 677 if (sk->sk_family == AF_INET6) { 678 if (req->rsk_ops->family == AF_INET6) { 679 entry->saddr = ireq->ir_v6_loc_addr.s6_addr32; 680 entry->daddr = ireq->ir_v6_rmt_addr.s6_addr32; 681 } else if (req->rsk_ops->family == AF_INET) { 682 ipv6_addr_set_v4mapped(ireq->ir_loc_addr, 683 &entry->saddr_storage); 684 ipv6_addr_set_v4mapped(ireq->ir_rmt_addr, 685 &entry->daddr_storage); 686 entry->saddr = entry->saddr_storage.s6_addr32; 687 entry->daddr = entry->daddr_storage.s6_addr32; 688 } 689 } else 690 #endif 691 { 692 entry->saddr = &ireq->ir_loc_addr; 693 entry->daddr = &ireq->ir_rmt_addr; 694 } 695 } 696 697 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 698 struct request_sock *req, 699 struct user_namespace *user_ns, 700 u32 portid, u32 seq, 701 const struct nlmsghdr *unlh) 702 { 703 const struct inet_request_sock *ireq = inet_rsk(req); 704 struct inet_sock *inet = inet_sk(sk); 705 struct inet_diag_msg *r; 706 struct nlmsghdr *nlh; 707 long tmo; 708 709 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 710 NLM_F_MULTI); 711 if (!nlh) 712 return -EMSGSIZE; 713 714 r = nlmsg_data(nlh); 715 r->idiag_family = sk->sk_family; 716 r->idiag_state = TCP_SYN_RECV; 717 r->idiag_timer = 1; 718 r->idiag_retrans = req->num_retrans; 719 720 r->id.idiag_if = sk->sk_bound_dev_if; 721 sock_diag_save_cookie(req, r->id.idiag_cookie); 722 723 tmo = req->expires - jiffies; 724 if (tmo < 0) 725 tmo = 0; 726 727 r->id.idiag_sport = inet->inet_sport; 728 r->id.idiag_dport = ireq->ir_rmt_port; 729 r->id.idiag_src[0] = ireq->ir_loc_addr; 730 r->id.idiag_dst[0] = ireq->ir_rmt_addr; 731 r->idiag_expires = jiffies_to_msecs(tmo); 732 r->idiag_rqueue = 0; 733 r->idiag_wqueue = 0; 734 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); 735 r->idiag_inode = 0; 736 #if IS_ENABLED(CONFIG_IPV6) 737 if (r->idiag_family == AF_INET6) { 738 struct inet_diag_entry entry; 739 inet_diag_req_addrs(sk, req, &entry); 740 memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr)); 741 memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr)); 742 } 743 #endif 744 745 return nlmsg_end(skb, nlh); 746 } 747 748 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 749 struct netlink_callback *cb, 750 struct inet_diag_req_v2 *r, 751 const struct nlattr *bc) 752 { 753 struct inet_diag_entry entry; 754 struct inet_connection_sock *icsk = inet_csk(sk); 755 struct listen_sock *lopt; 756 struct inet_sock *inet = inet_sk(sk); 757 int j, s_j; 758 int reqnum, s_reqnum; 759 int err = 0; 760 761 s_j = cb->args[3]; 762 s_reqnum = cb->args[4]; 763 764 if (s_j > 0) 765 s_j--; 766 767 entry.family = sk->sk_family; 768 769 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 770 771 lopt = icsk->icsk_accept_queue.listen_opt; 772 if (!lopt || !lopt->qlen) 773 goto out; 774 775 if (bc != NULL) { 776 entry.sport = inet->inet_num; 777 entry.userlocks = sk->sk_userlocks; 778 } 779 780 for (j = s_j; j < lopt->nr_table_entries; j++) { 781 struct request_sock *req, *head = lopt->syn_table[j]; 782 783 reqnum = 0; 784 for (req = head; req; reqnum++, req = req->dl_next) { 785 struct inet_request_sock *ireq = inet_rsk(req); 786 787 if (reqnum < s_reqnum) 788 continue; 789 if (r->id.idiag_dport != ireq->ir_rmt_port && 790 r->id.idiag_dport) 791 continue; 792 793 if (bc) { 794 inet_diag_req_addrs(sk, req, &entry); 795 entry.dport = ntohs(ireq->ir_rmt_port); 796 797 if (!inet_diag_bc_run(bc, &entry)) 798 continue; 799 } 800 801 err = inet_diag_fill_req(skb, sk, req, 802 sk_user_ns(NETLINK_CB(cb->skb).sk), 803 NETLINK_CB(cb->skb).portid, 804 cb->nlh->nlmsg_seq, cb->nlh); 805 if (err < 0) { 806 cb->args[3] = j + 1; 807 cb->args[4] = reqnum; 808 goto out; 809 } 810 } 811 812 s_reqnum = 0; 813 } 814 815 out: 816 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 817 818 return err; 819 } 820 821 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, 822 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc) 823 { 824 int i, num; 825 int s_i, s_num; 826 struct net *net = sock_net(skb->sk); 827 828 s_i = cb->args[1]; 829 s_num = num = cb->args[2]; 830 831 if (cb->args[0] == 0) { 832 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 833 goto skip_listen_ht; 834 835 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 836 struct sock *sk; 837 struct hlist_nulls_node *node; 838 struct inet_listen_hashbucket *ilb; 839 840 num = 0; 841 ilb = &hashinfo->listening_hash[i]; 842 spin_lock_bh(&ilb->lock); 843 sk_nulls_for_each(sk, node, &ilb->head) { 844 struct inet_sock *inet = inet_sk(sk); 845 846 if (!net_eq(sock_net(sk), net)) 847 continue; 848 849 if (num < s_num) { 850 num++; 851 continue; 852 } 853 854 if (r->sdiag_family != AF_UNSPEC && 855 sk->sk_family != r->sdiag_family) 856 goto next_listen; 857 858 if (r->id.idiag_sport != inet->inet_sport && 859 r->id.idiag_sport) 860 goto next_listen; 861 862 if (!(r->idiag_states & TCPF_LISTEN) || 863 r->id.idiag_dport || 864 cb->args[3] > 0) 865 goto syn_recv; 866 867 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 868 spin_unlock_bh(&ilb->lock); 869 goto done; 870 } 871 872 syn_recv: 873 if (!(r->idiag_states & TCPF_SYN_RECV)) 874 goto next_listen; 875 876 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) { 877 spin_unlock_bh(&ilb->lock); 878 goto done; 879 } 880 881 next_listen: 882 cb->args[3] = 0; 883 cb->args[4] = 0; 884 ++num; 885 } 886 spin_unlock_bh(&ilb->lock); 887 888 s_num = 0; 889 cb->args[3] = 0; 890 cb->args[4] = 0; 891 } 892 skip_listen_ht: 893 cb->args[0] = 1; 894 s_i = num = s_num = 0; 895 } 896 897 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 898 goto out; 899 900 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 901 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 902 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 903 struct sock *sk; 904 struct hlist_nulls_node *node; 905 906 num = 0; 907 908 if (hlist_nulls_empty(&head->chain)) 909 continue; 910 911 if (i > s_i) 912 s_num = 0; 913 914 spin_lock_bh(lock); 915 sk_nulls_for_each(sk, node, &head->chain) { 916 int res; 917 918 if (!net_eq(sock_net(sk), net)) 919 continue; 920 if (num < s_num) 921 goto next_normal; 922 if (!(r->idiag_states & (1 << sk->sk_state))) 923 goto next_normal; 924 if (r->sdiag_family != AF_UNSPEC && 925 sk->sk_family != r->sdiag_family) 926 goto next_normal; 927 if (r->id.idiag_sport != htons(sk->sk_num) && 928 r->id.idiag_sport) 929 goto next_normal; 930 if (r->id.idiag_dport != sk->sk_dport && 931 r->id.idiag_dport) 932 goto next_normal; 933 if (sk->sk_state == TCP_TIME_WAIT) 934 res = inet_twsk_diag_dump(sk, skb, cb, r, bc); 935 else 936 res = inet_csk_diag_dump(sk, skb, cb, r, bc); 937 if (res < 0) { 938 spin_unlock_bh(lock); 939 goto done; 940 } 941 next_normal: 942 ++num; 943 } 944 945 spin_unlock_bh(lock); 946 } 947 948 done: 949 cb->args[1] = i; 950 cb->args[2] = num; 951 out: 952 ; 953 } 954 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk); 955 956 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 957 struct inet_diag_req_v2 *r, struct nlattr *bc) 958 { 959 const struct inet_diag_handler *handler; 960 int err = 0; 961 962 handler = inet_diag_lock_handler(r->sdiag_protocol); 963 if (!IS_ERR(handler)) 964 handler->dump(skb, cb, r, bc); 965 else 966 err = PTR_ERR(handler); 967 inet_diag_unlock_handler(handler); 968 969 return err ? : skb->len; 970 } 971 972 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 973 { 974 struct nlattr *bc = NULL; 975 int hdrlen = sizeof(struct inet_diag_req_v2); 976 977 if (nlmsg_attrlen(cb->nlh, hdrlen)) 978 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 979 980 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc); 981 } 982 983 static inline int inet_diag_type2proto(int type) 984 { 985 switch (type) { 986 case TCPDIAG_GETSOCK: 987 return IPPROTO_TCP; 988 case DCCPDIAG_GETSOCK: 989 return IPPROTO_DCCP; 990 default: 991 return 0; 992 } 993 } 994 995 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb) 996 { 997 struct inet_diag_req *rc = nlmsg_data(cb->nlh); 998 struct inet_diag_req_v2 req; 999 struct nlattr *bc = NULL; 1000 int hdrlen = sizeof(struct inet_diag_req); 1001 1002 req.sdiag_family = AF_UNSPEC; /* compatibility */ 1003 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 1004 req.idiag_ext = rc->idiag_ext; 1005 req.idiag_states = rc->idiag_states; 1006 req.id = rc->id; 1007 1008 if (nlmsg_attrlen(cb->nlh, hdrlen)) 1009 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 1010 1011 return __inet_diag_dump(skb, cb, &req, bc); 1012 } 1013 1014 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 1015 const struct nlmsghdr *nlh) 1016 { 1017 struct inet_diag_req *rc = nlmsg_data(nlh); 1018 struct inet_diag_req_v2 req; 1019 1020 req.sdiag_family = rc->idiag_family; 1021 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 1022 req.idiag_ext = rc->idiag_ext; 1023 req.idiag_states = rc->idiag_states; 1024 req.id = rc->id; 1025 1026 return inet_diag_get_exact(in_skb, nlh, &req); 1027 } 1028 1029 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 1030 { 1031 int hdrlen = sizeof(struct inet_diag_req); 1032 struct net *net = sock_net(skb->sk); 1033 1034 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 1035 nlmsg_len(nlh) < hdrlen) 1036 return -EINVAL; 1037 1038 if (nlh->nlmsg_flags & NLM_F_DUMP) { 1039 if (nlmsg_attrlen(nlh, hdrlen)) { 1040 struct nlattr *attr; 1041 1042 attr = nlmsg_find_attr(nlh, hdrlen, 1043 INET_DIAG_REQ_BYTECODE); 1044 if (attr == NULL || 1045 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 1046 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 1047 return -EINVAL; 1048 } 1049 { 1050 struct netlink_dump_control c = { 1051 .dump = inet_diag_dump_compat, 1052 }; 1053 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c); 1054 } 1055 } 1056 1057 return inet_diag_get_exact_compat(skb, nlh); 1058 } 1059 1060 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) 1061 { 1062 int hdrlen = sizeof(struct inet_diag_req_v2); 1063 struct net *net = sock_net(skb->sk); 1064 1065 if (nlmsg_len(h) < hdrlen) 1066 return -EINVAL; 1067 1068 if (h->nlmsg_flags & NLM_F_DUMP) { 1069 if (nlmsg_attrlen(h, hdrlen)) { 1070 struct nlattr *attr; 1071 attr = nlmsg_find_attr(h, hdrlen, 1072 INET_DIAG_REQ_BYTECODE); 1073 if (attr == NULL || 1074 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 1075 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 1076 return -EINVAL; 1077 } 1078 { 1079 struct netlink_dump_control c = { 1080 .dump = inet_diag_dump, 1081 }; 1082 return netlink_dump_start(net->diag_nlsk, skb, h, &c); 1083 } 1084 } 1085 1086 return inet_diag_get_exact(skb, h, nlmsg_data(h)); 1087 } 1088 1089 static const struct sock_diag_handler inet_diag_handler = { 1090 .family = AF_INET, 1091 .dump = inet_diag_handler_dump, 1092 }; 1093 1094 static const struct sock_diag_handler inet6_diag_handler = { 1095 .family = AF_INET6, 1096 .dump = inet_diag_handler_dump, 1097 }; 1098 1099 int inet_diag_register(const struct inet_diag_handler *h) 1100 { 1101 const __u16 type = h->idiag_type; 1102 int err = -EINVAL; 1103 1104 if (type >= IPPROTO_MAX) 1105 goto out; 1106 1107 mutex_lock(&inet_diag_table_mutex); 1108 err = -EEXIST; 1109 if (inet_diag_table[type] == NULL) { 1110 inet_diag_table[type] = h; 1111 err = 0; 1112 } 1113 mutex_unlock(&inet_diag_table_mutex); 1114 out: 1115 return err; 1116 } 1117 EXPORT_SYMBOL_GPL(inet_diag_register); 1118 1119 void inet_diag_unregister(const struct inet_diag_handler *h) 1120 { 1121 const __u16 type = h->idiag_type; 1122 1123 if (type >= IPPROTO_MAX) 1124 return; 1125 1126 mutex_lock(&inet_diag_table_mutex); 1127 inet_diag_table[type] = NULL; 1128 mutex_unlock(&inet_diag_table_mutex); 1129 } 1130 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1131 1132 static int __init inet_diag_init(void) 1133 { 1134 const int inet_diag_table_size = (IPPROTO_MAX * 1135 sizeof(struct inet_diag_handler *)); 1136 int err = -ENOMEM; 1137 1138 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1139 if (!inet_diag_table) 1140 goto out; 1141 1142 err = sock_diag_register(&inet_diag_handler); 1143 if (err) 1144 goto out_free_nl; 1145 1146 err = sock_diag_register(&inet6_diag_handler); 1147 if (err) 1148 goto out_free_inet; 1149 1150 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1151 out: 1152 return err; 1153 1154 out_free_inet: 1155 sock_diag_unregister(&inet_diag_handler); 1156 out_free_nl: 1157 kfree(inet_diag_table); 1158 goto out; 1159 } 1160 1161 static void __exit inet_diag_exit(void) 1162 { 1163 sock_diag_unregister(&inet6_diag_handler); 1164 sock_diag_unregister(&inet_diag_handler); 1165 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1166 kfree(inet_diag_table); 1167 } 1168 1169 module_init(inet_diag_init); 1170 module_exit(inet_diag_exit); 1171 MODULE_LICENSE("GPL"); 1172 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */); 1173 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */); 1174