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