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 const struct ipv6_pinfo *np = inet6_sk(sk); 125 126 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr; 127 *(struct in6_addr *)r->id.idiag_dst = np->daddr; 128 129 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 130 if (nla_put_u8(skb, INET_DIAG_TCLASS, np->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 r->idiag_timer = 1; 163 r->idiag_retrans = icsk->icsk_retransmits; 164 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 165 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 166 r->idiag_timer = 4; 167 r->idiag_retrans = icsk->icsk_probes_out; 168 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 169 } else if (timer_pending(&sk->sk_timer)) { 170 r->idiag_timer = 2; 171 r->idiag_retrans = icsk->icsk_probes_out; 172 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 173 } else { 174 r->idiag_timer = 0; 175 r->idiag_expires = 0; 176 } 177 #undef EXPIRES_IN_MS 178 179 if (ext & (1 << (INET_DIAG_INFO - 1))) { 180 attr = nla_reserve(skb, INET_DIAG_INFO, 181 sizeof(struct tcp_info)); 182 if (!attr) 183 goto errout; 184 185 info = nla_data(attr); 186 } 187 188 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) 189 if (nla_put_string(skb, INET_DIAG_CONG, 190 icsk->icsk_ca_ops->name) < 0) 191 goto errout; 192 193 handler->idiag_get_info(sk, r, info); 194 195 if (sk->sk_state < TCP_TIME_WAIT && 196 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 197 icsk->icsk_ca_ops->get_info(sk, ext, skb); 198 199 out: 200 return nlmsg_end(skb, nlh); 201 202 errout: 203 nlmsg_cancel(skb, nlh); 204 return -EMSGSIZE; 205 } 206 EXPORT_SYMBOL_GPL(inet_sk_diag_fill); 207 208 static int inet_csk_diag_fill(struct sock *sk, 209 struct sk_buff *skb, struct inet_diag_req_v2 *req, 210 struct user_namespace *user_ns, 211 u32 portid, u32 seq, u16 nlmsg_flags, 212 const struct nlmsghdr *unlh) 213 { 214 return inet_sk_diag_fill(sk, inet_csk(sk), 215 skb, req, user_ns, portid, seq, nlmsg_flags, unlh); 216 } 217 218 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 219 struct sk_buff *skb, struct inet_diag_req_v2 *req, 220 u32 portid, u32 seq, u16 nlmsg_flags, 221 const struct nlmsghdr *unlh) 222 { 223 long tmo; 224 struct inet_diag_msg *r; 225 struct nlmsghdr *nlh; 226 227 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 228 nlmsg_flags); 229 if (!nlh) 230 return -EMSGSIZE; 231 232 r = nlmsg_data(nlh); 233 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 234 235 tmo = tw->tw_ttd - jiffies; 236 if (tmo < 0) 237 tmo = 0; 238 239 r->idiag_family = tw->tw_family; 240 r->idiag_retrans = 0; 241 r->id.idiag_if = tw->tw_bound_dev_if; 242 sock_diag_save_cookie(tw, r->id.idiag_cookie); 243 r->id.idiag_sport = tw->tw_sport; 244 r->id.idiag_dport = tw->tw_dport; 245 r->id.idiag_src[0] = tw->tw_rcv_saddr; 246 r->id.idiag_dst[0] = tw->tw_daddr; 247 r->idiag_state = tw->tw_substate; 248 r->idiag_timer = 3; 249 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); 250 r->idiag_rqueue = 0; 251 r->idiag_wqueue = 0; 252 r->idiag_uid = 0; 253 r->idiag_inode = 0; 254 #if IS_ENABLED(CONFIG_IPV6) 255 if (tw->tw_family == AF_INET6) { 256 const struct inet6_timewait_sock *tw6 = 257 inet6_twsk((struct sock *)tw); 258 259 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr; 260 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr; 261 } 262 #endif 263 264 return nlmsg_end(skb, nlh); 265 } 266 267 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 268 struct inet_diag_req_v2 *r, 269 struct user_namespace *user_ns, 270 u32 portid, u32 seq, u16 nlmsg_flags, 271 const struct nlmsghdr *unlh) 272 { 273 if (sk->sk_state == TCP_TIME_WAIT) 274 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 275 skb, r, portid, seq, nlmsg_flags, 276 unlh); 277 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, 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).ssk), 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 if (sk->sk_state == TCP_TIME_WAIT) 341 inet_twsk_put((struct inet_timewait_sock *)sk); 342 else 343 sock_put(sk); 344 } 345 out_nosk: 346 return err; 347 } 348 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk); 349 350 static int inet_diag_get_exact(struct sk_buff *in_skb, 351 const struct nlmsghdr *nlh, 352 struct inet_diag_req_v2 *req) 353 { 354 const struct inet_diag_handler *handler; 355 int err; 356 357 handler = inet_diag_lock_handler(req->sdiag_protocol); 358 if (IS_ERR(handler)) 359 err = PTR_ERR(handler); 360 else 361 err = handler->dump_one(in_skb, nlh, req); 362 inet_diag_unlock_handler(handler); 363 364 return err; 365 } 366 367 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 368 { 369 int words = bits >> 5; 370 371 bits &= 0x1f; 372 373 if (words) { 374 if (memcmp(a1, a2, words << 2)) 375 return 0; 376 } 377 if (bits) { 378 __be32 w1, w2; 379 __be32 mask; 380 381 w1 = a1[words]; 382 w2 = a2[words]; 383 384 mask = htonl((0xffffffff) << (32 - bits)); 385 386 if ((w1 ^ w2) & mask) 387 return 0; 388 } 389 390 return 1; 391 } 392 393 394 static int inet_diag_bc_run(const struct nlattr *_bc, 395 const struct inet_diag_entry *entry) 396 { 397 const void *bc = nla_data(_bc); 398 int len = nla_len(_bc); 399 400 while (len > 0) { 401 int yes = 1; 402 const struct inet_diag_bc_op *op = bc; 403 404 switch (op->code) { 405 case INET_DIAG_BC_NOP: 406 break; 407 case INET_DIAG_BC_JMP: 408 yes = 0; 409 break; 410 case INET_DIAG_BC_S_GE: 411 yes = entry->sport >= op[1].no; 412 break; 413 case INET_DIAG_BC_S_LE: 414 yes = entry->sport <= op[1].no; 415 break; 416 case INET_DIAG_BC_D_GE: 417 yes = entry->dport >= op[1].no; 418 break; 419 case INET_DIAG_BC_D_LE: 420 yes = entry->dport <= op[1].no; 421 break; 422 case INET_DIAG_BC_AUTO: 423 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 424 break; 425 case INET_DIAG_BC_S_COND: 426 case INET_DIAG_BC_D_COND: { 427 struct inet_diag_hostcond *cond; 428 __be32 *addr; 429 430 cond = (struct inet_diag_hostcond *)(op + 1); 431 if (cond->port != -1 && 432 cond->port != (op->code == INET_DIAG_BC_S_COND ? 433 entry->sport : entry->dport)) { 434 yes = 0; 435 break; 436 } 437 438 if (op->code == INET_DIAG_BC_S_COND) 439 addr = entry->saddr; 440 else 441 addr = entry->daddr; 442 443 if (cond->family != AF_UNSPEC && 444 cond->family != entry->family) { 445 if (entry->family == AF_INET6 && 446 cond->family == AF_INET) { 447 if (addr[0] == 0 && addr[1] == 0 && 448 addr[2] == htonl(0xffff) && 449 bitstring_match(addr + 3, 450 cond->addr, 451 cond->prefix_len)) 452 break; 453 } 454 yes = 0; 455 break; 456 } 457 458 if (cond->prefix_len == 0) 459 break; 460 if (bitstring_match(addr, cond->addr, 461 cond->prefix_len)) 462 break; 463 yes = 0; 464 break; 465 } 466 } 467 468 if (yes) { 469 len -= op->yes; 470 bc += op->yes; 471 } else { 472 len -= op->no; 473 bc += op->no; 474 } 475 } 476 return len == 0; 477 } 478 479 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) 480 { 481 struct inet_diag_entry entry; 482 struct inet_sock *inet = inet_sk(sk); 483 484 if (bc == NULL) 485 return 1; 486 487 entry.family = sk->sk_family; 488 #if IS_ENABLED(CONFIG_IPV6) 489 if (entry.family == AF_INET6) { 490 struct ipv6_pinfo *np = inet6_sk(sk); 491 492 entry.saddr = np->rcv_saddr.s6_addr32; 493 entry.daddr = np->daddr.s6_addr32; 494 } else 495 #endif 496 { 497 entry.saddr = &inet->inet_rcv_saddr; 498 entry.daddr = &inet->inet_daddr; 499 } 500 entry.sport = inet->inet_num; 501 entry.dport = ntohs(inet->inet_dport); 502 entry.userlocks = sk->sk_userlocks; 503 504 return inet_diag_bc_run(bc, &entry); 505 } 506 EXPORT_SYMBOL_GPL(inet_diag_bc_sk); 507 508 static int valid_cc(const void *bc, int len, int cc) 509 { 510 while (len >= 0) { 511 const struct inet_diag_bc_op *op = bc; 512 513 if (cc > len) 514 return 0; 515 if (cc == len) 516 return 1; 517 if (op->yes < 4 || op->yes & 3) 518 return 0; 519 len -= op->yes; 520 bc += op->yes; 521 } 522 return 0; 523 } 524 525 /* Validate an inet_diag_hostcond. */ 526 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len, 527 int *min_len) 528 { 529 int addr_len; 530 struct inet_diag_hostcond *cond; 531 532 /* Check hostcond space. */ 533 *min_len += sizeof(struct inet_diag_hostcond); 534 if (len < *min_len) 535 return false; 536 cond = (struct inet_diag_hostcond *)(op + 1); 537 538 /* Check address family and address length. */ 539 switch (cond->family) { 540 case AF_UNSPEC: 541 addr_len = 0; 542 break; 543 case AF_INET: 544 addr_len = sizeof(struct in_addr); 545 break; 546 case AF_INET6: 547 addr_len = sizeof(struct in6_addr); 548 break; 549 default: 550 return false; 551 } 552 *min_len += addr_len; 553 if (len < *min_len) 554 return false; 555 556 /* Check prefix length (in bits) vs address length (in bytes). */ 557 if (cond->prefix_len > 8 * addr_len) 558 return false; 559 560 return true; 561 } 562 563 /* Validate a port comparison operator. */ 564 static inline bool valid_port_comparison(const struct inet_diag_bc_op *op, 565 int len, int *min_len) 566 { 567 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */ 568 *min_len += sizeof(struct inet_diag_bc_op); 569 if (len < *min_len) 570 return false; 571 return true; 572 } 573 574 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 575 { 576 const void *bc = bytecode; 577 int len = bytecode_len; 578 579 while (len > 0) { 580 const struct inet_diag_bc_op *op = bc; 581 int min_len = sizeof(struct inet_diag_bc_op); 582 583 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 584 switch (op->code) { 585 case INET_DIAG_BC_S_COND: 586 case INET_DIAG_BC_D_COND: 587 if (!valid_hostcond(bc, len, &min_len)) 588 return -EINVAL; 589 break; 590 case INET_DIAG_BC_S_GE: 591 case INET_DIAG_BC_S_LE: 592 case INET_DIAG_BC_D_GE: 593 case INET_DIAG_BC_D_LE: 594 if (!valid_port_comparison(bc, len, &min_len)) 595 return -EINVAL; 596 break; 597 case INET_DIAG_BC_AUTO: 598 case INET_DIAG_BC_JMP: 599 case INET_DIAG_BC_NOP: 600 break; 601 default: 602 return -EINVAL; 603 } 604 605 if (op->code != INET_DIAG_BC_NOP) { 606 if (op->no < min_len || op->no > len + 4 || op->no & 3) 607 return -EINVAL; 608 if (op->no < len && 609 !valid_cc(bytecode, bytecode_len, len - op->no)) 610 return -EINVAL; 611 } 612 613 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3) 614 return -EINVAL; 615 bc += op->yes; 616 len -= op->yes; 617 } 618 return len == 0 ? 0 : -EINVAL; 619 } 620 621 static int inet_csk_diag_dump(struct sock *sk, 622 struct sk_buff *skb, 623 struct netlink_callback *cb, 624 struct inet_diag_req_v2 *r, 625 const struct nlattr *bc) 626 { 627 if (!inet_diag_bc_sk(bc, sk)) 628 return 0; 629 630 return inet_csk_diag_fill(sk, skb, r, 631 sk_user_ns(NETLINK_CB(cb->skb).ssk), 632 NETLINK_CB(cb->skb).portid, 633 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 634 } 635 636 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 637 struct sk_buff *skb, 638 struct netlink_callback *cb, 639 struct inet_diag_req_v2 *r, 640 const struct nlattr *bc) 641 { 642 if (bc != NULL) { 643 struct inet_diag_entry entry; 644 645 entry.family = tw->tw_family; 646 #if IS_ENABLED(CONFIG_IPV6) 647 if (tw->tw_family == AF_INET6) { 648 struct inet6_timewait_sock *tw6 = 649 inet6_twsk((struct sock *)tw); 650 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 651 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 652 } else 653 #endif 654 { 655 entry.saddr = &tw->tw_rcv_saddr; 656 entry.daddr = &tw->tw_daddr; 657 } 658 entry.sport = tw->tw_num; 659 entry.dport = ntohs(tw->tw_dport); 660 entry.userlocks = 0; 661 662 if (!inet_diag_bc_run(bc, &entry)) 663 return 0; 664 } 665 666 return inet_twsk_diag_fill(tw, skb, r, 667 NETLINK_CB(cb->skb).portid, 668 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 669 } 670 671 /* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses 672 * from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6. 673 */ 674 static inline void inet_diag_req_addrs(const struct sock *sk, 675 const struct request_sock *req, 676 struct inet_diag_entry *entry) 677 { 678 struct inet_request_sock *ireq = inet_rsk(req); 679 680 #if IS_ENABLED(CONFIG_IPV6) 681 if (sk->sk_family == AF_INET6) { 682 if (req->rsk_ops->family == AF_INET6) { 683 entry->saddr = inet6_rsk(req)->loc_addr.s6_addr32; 684 entry->daddr = inet6_rsk(req)->rmt_addr.s6_addr32; 685 } else if (req->rsk_ops->family == AF_INET) { 686 ipv6_addr_set_v4mapped(ireq->loc_addr, 687 &entry->saddr_storage); 688 ipv6_addr_set_v4mapped(ireq->rmt_addr, 689 &entry->daddr_storage); 690 entry->saddr = entry->saddr_storage.s6_addr32; 691 entry->daddr = entry->daddr_storage.s6_addr32; 692 } 693 } else 694 #endif 695 { 696 entry->saddr = &ireq->loc_addr; 697 entry->daddr = &ireq->rmt_addr; 698 } 699 } 700 701 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 702 struct request_sock *req, 703 struct user_namespace *user_ns, 704 u32 portid, u32 seq, 705 const struct nlmsghdr *unlh) 706 { 707 const struct inet_request_sock *ireq = inet_rsk(req); 708 struct inet_sock *inet = inet_sk(sk); 709 struct inet_diag_msg *r; 710 struct nlmsghdr *nlh; 711 long tmo; 712 713 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 714 NLM_F_MULTI); 715 if (!nlh) 716 return -EMSGSIZE; 717 718 r = nlmsg_data(nlh); 719 r->idiag_family = sk->sk_family; 720 r->idiag_state = TCP_SYN_RECV; 721 r->idiag_timer = 1; 722 r->idiag_retrans = req->num_retrans; 723 724 r->id.idiag_if = sk->sk_bound_dev_if; 725 sock_diag_save_cookie(req, r->id.idiag_cookie); 726 727 tmo = req->expires - jiffies; 728 if (tmo < 0) 729 tmo = 0; 730 731 r->id.idiag_sport = inet->inet_sport; 732 r->id.idiag_dport = ireq->rmt_port; 733 r->id.idiag_src[0] = ireq->loc_addr; 734 r->id.idiag_dst[0] = ireq->rmt_addr; 735 r->idiag_expires = jiffies_to_msecs(tmo); 736 r->idiag_rqueue = 0; 737 r->idiag_wqueue = 0; 738 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); 739 r->idiag_inode = 0; 740 #if IS_ENABLED(CONFIG_IPV6) 741 if (r->idiag_family == AF_INET6) { 742 struct inet_diag_entry entry; 743 inet_diag_req_addrs(sk, req, &entry); 744 memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr)); 745 memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr)); 746 } 747 #endif 748 749 return nlmsg_end(skb, nlh); 750 } 751 752 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 753 struct netlink_callback *cb, 754 struct inet_diag_req_v2 *r, 755 const struct nlattr *bc) 756 { 757 struct inet_diag_entry entry; 758 struct inet_connection_sock *icsk = inet_csk(sk); 759 struct listen_sock *lopt; 760 struct inet_sock *inet = inet_sk(sk); 761 int j, s_j; 762 int reqnum, s_reqnum; 763 int err = 0; 764 765 s_j = cb->args[3]; 766 s_reqnum = cb->args[4]; 767 768 if (s_j > 0) 769 s_j--; 770 771 entry.family = sk->sk_family; 772 773 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 774 775 lopt = icsk->icsk_accept_queue.listen_opt; 776 if (!lopt || !lopt->qlen) 777 goto out; 778 779 if (bc != NULL) { 780 entry.sport = inet->inet_num; 781 entry.userlocks = sk->sk_userlocks; 782 } 783 784 for (j = s_j; j < lopt->nr_table_entries; j++) { 785 struct request_sock *req, *head = lopt->syn_table[j]; 786 787 reqnum = 0; 788 for (req = head; req; reqnum++, req = req->dl_next) { 789 struct inet_request_sock *ireq = inet_rsk(req); 790 791 if (reqnum < s_reqnum) 792 continue; 793 if (r->id.idiag_dport != ireq->rmt_port && 794 r->id.idiag_dport) 795 continue; 796 797 if (bc) { 798 inet_diag_req_addrs(sk, req, &entry); 799 entry.dport = ntohs(ireq->rmt_port); 800 801 if (!inet_diag_bc_run(bc, &entry)) 802 continue; 803 } 804 805 err = inet_diag_fill_req(skb, sk, req, 806 sk_user_ns(NETLINK_CB(cb->skb).ssk), 807 NETLINK_CB(cb->skb).portid, 808 cb->nlh->nlmsg_seq, cb->nlh); 809 if (err < 0) { 810 cb->args[3] = j + 1; 811 cb->args[4] = reqnum; 812 goto out; 813 } 814 } 815 816 s_reqnum = 0; 817 } 818 819 out: 820 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 821 822 return err; 823 } 824 825 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, 826 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc) 827 { 828 int i, num; 829 int s_i, s_num; 830 struct net *net = sock_net(skb->sk); 831 832 s_i = cb->args[1]; 833 s_num = num = cb->args[2]; 834 835 if (cb->args[0] == 0) { 836 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 837 goto skip_listen_ht; 838 839 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 840 struct sock *sk; 841 struct hlist_nulls_node *node; 842 struct inet_listen_hashbucket *ilb; 843 844 num = 0; 845 ilb = &hashinfo->listening_hash[i]; 846 spin_lock_bh(&ilb->lock); 847 sk_nulls_for_each(sk, node, &ilb->head) { 848 struct inet_sock *inet = inet_sk(sk); 849 850 if (!net_eq(sock_net(sk), net)) 851 continue; 852 853 if (num < s_num) { 854 num++; 855 continue; 856 } 857 858 if (r->sdiag_family != AF_UNSPEC && 859 sk->sk_family != r->sdiag_family) 860 goto next_listen; 861 862 if (r->id.idiag_sport != inet->inet_sport && 863 r->id.idiag_sport) 864 goto next_listen; 865 866 if (!(r->idiag_states & TCPF_LISTEN) || 867 r->id.idiag_dport || 868 cb->args[3] > 0) 869 goto syn_recv; 870 871 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 872 spin_unlock_bh(&ilb->lock); 873 goto done; 874 } 875 876 syn_recv: 877 if (!(r->idiag_states & TCPF_SYN_RECV)) 878 goto next_listen; 879 880 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) { 881 spin_unlock_bh(&ilb->lock); 882 goto done; 883 } 884 885 next_listen: 886 cb->args[3] = 0; 887 cb->args[4] = 0; 888 ++num; 889 } 890 spin_unlock_bh(&ilb->lock); 891 892 s_num = 0; 893 cb->args[3] = 0; 894 cb->args[4] = 0; 895 } 896 skip_listen_ht: 897 cb->args[0] = 1; 898 s_i = num = s_num = 0; 899 } 900 901 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 902 goto out; 903 904 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 905 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 906 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 907 struct sock *sk; 908 struct hlist_nulls_node *node; 909 910 num = 0; 911 912 if (hlist_nulls_empty(&head->chain) && 913 hlist_nulls_empty(&head->twchain)) 914 continue; 915 916 if (i > s_i) 917 s_num = 0; 918 919 spin_lock_bh(lock); 920 sk_nulls_for_each(sk, node, &head->chain) { 921 struct inet_sock *inet = inet_sk(sk); 922 923 if (!net_eq(sock_net(sk), net)) 924 continue; 925 if (num < s_num) 926 goto next_normal; 927 if (!(r->idiag_states & (1 << sk->sk_state))) 928 goto next_normal; 929 if (r->sdiag_family != AF_UNSPEC && 930 sk->sk_family != r->sdiag_family) 931 goto next_normal; 932 if (r->id.idiag_sport != inet->inet_sport && 933 r->id.idiag_sport) 934 goto next_normal; 935 if (r->id.idiag_dport != inet->inet_dport && 936 r->id.idiag_dport) 937 goto next_normal; 938 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 939 spin_unlock_bh(lock); 940 goto done; 941 } 942 next_normal: 943 ++num; 944 } 945 946 if (r->idiag_states & TCPF_TIME_WAIT) { 947 struct inet_timewait_sock *tw; 948 949 inet_twsk_for_each(tw, node, 950 &head->twchain) { 951 if (!net_eq(twsk_net(tw), net)) 952 continue; 953 954 if (num < s_num) 955 goto next_dying; 956 if (r->sdiag_family != AF_UNSPEC && 957 tw->tw_family != r->sdiag_family) 958 goto next_dying; 959 if (r->id.idiag_sport != tw->tw_sport && 960 r->id.idiag_sport) 961 goto next_dying; 962 if (r->id.idiag_dport != tw->tw_dport && 963 r->id.idiag_dport) 964 goto next_dying; 965 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) { 966 spin_unlock_bh(lock); 967 goto done; 968 } 969 next_dying: 970 ++num; 971 } 972 } 973 spin_unlock_bh(lock); 974 } 975 976 done: 977 cb->args[1] = i; 978 cb->args[2] = num; 979 out: 980 ; 981 } 982 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk); 983 984 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 985 struct inet_diag_req_v2 *r, struct nlattr *bc) 986 { 987 const struct inet_diag_handler *handler; 988 int err = 0; 989 990 handler = inet_diag_lock_handler(r->sdiag_protocol); 991 if (!IS_ERR(handler)) 992 handler->dump(skb, cb, r, bc); 993 else 994 err = PTR_ERR(handler); 995 inet_diag_unlock_handler(handler); 996 997 return err ? : skb->len; 998 } 999 1000 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 1001 { 1002 struct nlattr *bc = NULL; 1003 int hdrlen = sizeof(struct inet_diag_req_v2); 1004 1005 if (nlmsg_attrlen(cb->nlh, hdrlen)) 1006 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 1007 1008 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc); 1009 } 1010 1011 static inline int inet_diag_type2proto(int type) 1012 { 1013 switch (type) { 1014 case TCPDIAG_GETSOCK: 1015 return IPPROTO_TCP; 1016 case DCCPDIAG_GETSOCK: 1017 return IPPROTO_DCCP; 1018 default: 1019 return 0; 1020 } 1021 } 1022 1023 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb) 1024 { 1025 struct inet_diag_req *rc = nlmsg_data(cb->nlh); 1026 struct inet_diag_req_v2 req; 1027 struct nlattr *bc = NULL; 1028 int hdrlen = sizeof(struct inet_diag_req); 1029 1030 req.sdiag_family = AF_UNSPEC; /* compatibility */ 1031 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 1032 req.idiag_ext = rc->idiag_ext; 1033 req.idiag_states = rc->idiag_states; 1034 req.id = rc->id; 1035 1036 if (nlmsg_attrlen(cb->nlh, hdrlen)) 1037 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 1038 1039 return __inet_diag_dump(skb, cb, &req, bc); 1040 } 1041 1042 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 1043 const struct nlmsghdr *nlh) 1044 { 1045 struct inet_diag_req *rc = nlmsg_data(nlh); 1046 struct inet_diag_req_v2 req; 1047 1048 req.sdiag_family = rc->idiag_family; 1049 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 1050 req.idiag_ext = rc->idiag_ext; 1051 req.idiag_states = rc->idiag_states; 1052 req.id = rc->id; 1053 1054 return inet_diag_get_exact(in_skb, nlh, &req); 1055 } 1056 1057 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 1058 { 1059 int hdrlen = sizeof(struct inet_diag_req); 1060 struct net *net = sock_net(skb->sk); 1061 1062 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 1063 nlmsg_len(nlh) < hdrlen) 1064 return -EINVAL; 1065 1066 if (nlh->nlmsg_flags & NLM_F_DUMP) { 1067 if (nlmsg_attrlen(nlh, hdrlen)) { 1068 struct nlattr *attr; 1069 1070 attr = nlmsg_find_attr(nlh, hdrlen, 1071 INET_DIAG_REQ_BYTECODE); 1072 if (attr == NULL || 1073 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 1074 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 1075 return -EINVAL; 1076 } 1077 { 1078 struct netlink_dump_control c = { 1079 .dump = inet_diag_dump_compat, 1080 }; 1081 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c); 1082 } 1083 } 1084 1085 return inet_diag_get_exact_compat(skb, nlh); 1086 } 1087 1088 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) 1089 { 1090 int hdrlen = sizeof(struct inet_diag_req_v2); 1091 struct net *net = sock_net(skb->sk); 1092 1093 if (nlmsg_len(h) < hdrlen) 1094 return -EINVAL; 1095 1096 if (h->nlmsg_flags & NLM_F_DUMP) { 1097 if (nlmsg_attrlen(h, hdrlen)) { 1098 struct nlattr *attr; 1099 attr = nlmsg_find_attr(h, hdrlen, 1100 INET_DIAG_REQ_BYTECODE); 1101 if (attr == NULL || 1102 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 1103 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 1104 return -EINVAL; 1105 } 1106 { 1107 struct netlink_dump_control c = { 1108 .dump = inet_diag_dump, 1109 }; 1110 return netlink_dump_start(net->diag_nlsk, skb, h, &c); 1111 } 1112 } 1113 1114 return inet_diag_get_exact(skb, h, nlmsg_data(h)); 1115 } 1116 1117 static const struct sock_diag_handler inet_diag_handler = { 1118 .family = AF_INET, 1119 .dump = inet_diag_handler_dump, 1120 }; 1121 1122 static const struct sock_diag_handler inet6_diag_handler = { 1123 .family = AF_INET6, 1124 .dump = inet_diag_handler_dump, 1125 }; 1126 1127 int inet_diag_register(const struct inet_diag_handler *h) 1128 { 1129 const __u16 type = h->idiag_type; 1130 int err = -EINVAL; 1131 1132 if (type >= IPPROTO_MAX) 1133 goto out; 1134 1135 mutex_lock(&inet_diag_table_mutex); 1136 err = -EEXIST; 1137 if (inet_diag_table[type] == NULL) { 1138 inet_diag_table[type] = h; 1139 err = 0; 1140 } 1141 mutex_unlock(&inet_diag_table_mutex); 1142 out: 1143 return err; 1144 } 1145 EXPORT_SYMBOL_GPL(inet_diag_register); 1146 1147 void inet_diag_unregister(const struct inet_diag_handler *h) 1148 { 1149 const __u16 type = h->idiag_type; 1150 1151 if (type >= IPPROTO_MAX) 1152 return; 1153 1154 mutex_lock(&inet_diag_table_mutex); 1155 inet_diag_table[type] = NULL; 1156 mutex_unlock(&inet_diag_table_mutex); 1157 } 1158 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1159 1160 static int __init inet_diag_init(void) 1161 { 1162 const int inet_diag_table_size = (IPPROTO_MAX * 1163 sizeof(struct inet_diag_handler *)); 1164 int err = -ENOMEM; 1165 1166 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1167 if (!inet_diag_table) 1168 goto out; 1169 1170 err = sock_diag_register(&inet_diag_handler); 1171 if (err) 1172 goto out_free_nl; 1173 1174 err = sock_diag_register(&inet6_diag_handler); 1175 if (err) 1176 goto out_free_inet; 1177 1178 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1179 out: 1180 return err; 1181 1182 out_free_inet: 1183 sock_diag_unregister(&inet_diag_handler); 1184 out_free_nl: 1185 kfree(inet_diag_table); 1186 goto out; 1187 } 1188 1189 static void __exit inet_diag_exit(void) 1190 { 1191 sock_diag_unregister(&inet6_diag_handler); 1192 sock_diag_unregister(&inet_diag_handler); 1193 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1194 kfree(inet_diag_table); 1195 } 1196 1197 module_init(inet_diag_init); 1198 module_exit(inet_diag_exit); 1199 MODULE_LICENSE("GPL"); 1200 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */); 1201 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */); 1202