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 }; 48 49 static DEFINE_MUTEX(inet_diag_table_mutex); 50 51 static const struct inet_diag_handler *inet_diag_lock_handler(int proto) 52 { 53 if (!inet_diag_table[proto]) 54 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK, 55 NETLINK_SOCK_DIAG, AF_INET, proto); 56 57 mutex_lock(&inet_diag_table_mutex); 58 if (!inet_diag_table[proto]) 59 return ERR_PTR(-ENOENT); 60 61 return inet_diag_table[proto]; 62 } 63 64 static inline void inet_diag_unlock_handler( 65 const struct inet_diag_handler *handler) 66 { 67 mutex_unlock(&inet_diag_table_mutex); 68 } 69 70 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, 71 struct sk_buff *skb, struct inet_diag_req_v2 *req, 72 struct user_namespace *user_ns, 73 u32 portid, u32 seq, u16 nlmsg_flags, 74 const struct nlmsghdr *unlh) 75 { 76 const struct inet_sock *inet = inet_sk(sk); 77 struct inet_diag_msg *r; 78 struct nlmsghdr *nlh; 79 struct nlattr *attr; 80 void *info = NULL; 81 const struct inet_diag_handler *handler; 82 int ext = req->idiag_ext; 83 84 handler = inet_diag_table[req->sdiag_protocol]; 85 BUG_ON(handler == NULL); 86 87 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 88 nlmsg_flags); 89 if (!nlh) 90 return -EMSGSIZE; 91 92 r = nlmsg_data(nlh); 93 BUG_ON(sk->sk_state == TCP_TIME_WAIT); 94 95 r->idiag_family = sk->sk_family; 96 r->idiag_state = sk->sk_state; 97 r->idiag_timer = 0; 98 r->idiag_retrans = 0; 99 100 r->id.idiag_if = sk->sk_bound_dev_if; 101 sock_diag_save_cookie(sk, r->id.idiag_cookie); 102 103 r->id.idiag_sport = inet->inet_sport; 104 r->id.idiag_dport = inet->inet_dport; 105 r->id.idiag_src[0] = inet->inet_rcv_saddr; 106 r->id.idiag_dst[0] = inet->inet_daddr; 107 108 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, 109 * hence this needs to be included regardless of socket family. 110 */ 111 if (ext & (1 << (INET_DIAG_TOS - 1))) 112 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0) 113 goto errout; 114 115 #if IS_ENABLED(CONFIG_IPV6) 116 if (r->idiag_family == AF_INET6) { 117 const struct ipv6_pinfo *np = inet6_sk(sk); 118 119 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr; 120 *(struct in6_addr *)r->id.idiag_dst = np->daddr; 121 122 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 123 if (nla_put_u8(skb, INET_DIAG_TCLASS, np->tclass) < 0) 124 goto errout; 125 } 126 #endif 127 128 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); 129 r->idiag_inode = sock_i_ino(sk); 130 131 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) { 132 struct inet_diag_meminfo minfo = { 133 .idiag_rmem = sk_rmem_alloc_get(sk), 134 .idiag_wmem = sk->sk_wmem_queued, 135 .idiag_fmem = sk->sk_forward_alloc, 136 .idiag_tmem = sk_wmem_alloc_get(sk), 137 }; 138 139 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0) 140 goto errout; 141 } 142 143 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) 144 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO)) 145 goto errout; 146 147 if (icsk == NULL) { 148 handler->idiag_get_info(sk, r, NULL); 149 goto out; 150 } 151 152 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) 153 154 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 155 r->idiag_timer = 1; 156 r->idiag_retrans = icsk->icsk_retransmits; 157 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 158 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 159 r->idiag_timer = 4; 160 r->idiag_retrans = icsk->icsk_probes_out; 161 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 162 } else if (timer_pending(&sk->sk_timer)) { 163 r->idiag_timer = 2; 164 r->idiag_retrans = icsk->icsk_probes_out; 165 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 166 } else { 167 r->idiag_timer = 0; 168 r->idiag_expires = 0; 169 } 170 #undef EXPIRES_IN_MS 171 172 if (ext & (1 << (INET_DIAG_INFO - 1))) { 173 attr = nla_reserve(skb, INET_DIAG_INFO, 174 sizeof(struct tcp_info)); 175 if (!attr) 176 goto errout; 177 178 info = nla_data(attr); 179 } 180 181 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) 182 if (nla_put_string(skb, INET_DIAG_CONG, 183 icsk->icsk_ca_ops->name) < 0) 184 goto errout; 185 186 handler->idiag_get_info(sk, r, info); 187 188 if (sk->sk_state < TCP_TIME_WAIT && 189 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 190 icsk->icsk_ca_ops->get_info(sk, ext, skb); 191 192 out: 193 return nlmsg_end(skb, nlh); 194 195 errout: 196 nlmsg_cancel(skb, nlh); 197 return -EMSGSIZE; 198 } 199 EXPORT_SYMBOL_GPL(inet_sk_diag_fill); 200 201 static int inet_csk_diag_fill(struct sock *sk, 202 struct sk_buff *skb, struct inet_diag_req_v2 *req, 203 struct user_namespace *user_ns, 204 u32 portid, u32 seq, u16 nlmsg_flags, 205 const struct nlmsghdr *unlh) 206 { 207 return inet_sk_diag_fill(sk, inet_csk(sk), 208 skb, req, user_ns, portid, seq, nlmsg_flags, unlh); 209 } 210 211 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 212 struct sk_buff *skb, struct inet_diag_req_v2 *req, 213 u32 portid, u32 seq, u16 nlmsg_flags, 214 const struct nlmsghdr *unlh) 215 { 216 long tmo; 217 struct inet_diag_msg *r; 218 struct nlmsghdr *nlh; 219 220 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 221 nlmsg_flags); 222 if (!nlh) 223 return -EMSGSIZE; 224 225 r = nlmsg_data(nlh); 226 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 227 228 tmo = tw->tw_ttd - jiffies; 229 if (tmo < 0) 230 tmo = 0; 231 232 r->idiag_family = tw->tw_family; 233 r->idiag_retrans = 0; 234 r->id.idiag_if = tw->tw_bound_dev_if; 235 sock_diag_save_cookie(tw, r->id.idiag_cookie); 236 r->id.idiag_sport = tw->tw_sport; 237 r->id.idiag_dport = tw->tw_dport; 238 r->id.idiag_src[0] = tw->tw_rcv_saddr; 239 r->id.idiag_dst[0] = tw->tw_daddr; 240 r->idiag_state = tw->tw_substate; 241 r->idiag_timer = 3; 242 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); 243 r->idiag_rqueue = 0; 244 r->idiag_wqueue = 0; 245 r->idiag_uid = 0; 246 r->idiag_inode = 0; 247 #if IS_ENABLED(CONFIG_IPV6) 248 if (tw->tw_family == AF_INET6) { 249 const struct inet6_timewait_sock *tw6 = 250 inet6_twsk((struct sock *)tw); 251 252 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr; 253 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr; 254 } 255 #endif 256 257 return nlmsg_end(skb, nlh); 258 } 259 260 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 261 struct inet_diag_req_v2 *r, 262 struct user_namespace *user_ns, 263 u32 portid, u32 seq, u16 nlmsg_flags, 264 const struct nlmsghdr *unlh) 265 { 266 if (sk->sk_state == TCP_TIME_WAIT) 267 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 268 skb, r, portid, seq, nlmsg_flags, 269 unlh); 270 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, nlmsg_flags, unlh); 271 } 272 273 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb, 274 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req) 275 { 276 int err; 277 struct sock *sk; 278 struct sk_buff *rep; 279 struct net *net = sock_net(in_skb->sk); 280 281 err = -EINVAL; 282 if (req->sdiag_family == AF_INET) { 283 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0], 284 req->id.idiag_dport, req->id.idiag_src[0], 285 req->id.idiag_sport, req->id.idiag_if); 286 } 287 #if IS_ENABLED(CONFIG_IPV6) 288 else if (req->sdiag_family == AF_INET6) { 289 sk = inet6_lookup(net, hashinfo, 290 (struct in6_addr *)req->id.idiag_dst, 291 req->id.idiag_dport, 292 (struct in6_addr *)req->id.idiag_src, 293 req->id.idiag_sport, 294 req->id.idiag_if); 295 } 296 #endif 297 else { 298 goto out_nosk; 299 } 300 301 err = -ENOENT; 302 if (sk == NULL) 303 goto out_nosk; 304 305 err = sock_diag_check_cookie(sk, req->id.idiag_cookie); 306 if (err) 307 goto out; 308 309 rep = nlmsg_new(sizeof(struct inet_diag_msg) + 310 sizeof(struct inet_diag_meminfo) + 311 sizeof(struct tcp_info) + 64, GFP_KERNEL); 312 if (!rep) { 313 err = -ENOMEM; 314 goto out; 315 } 316 317 err = sk_diag_fill(sk, rep, req, 318 sk_user_ns(NETLINK_CB(in_skb).ssk), 319 NETLINK_CB(in_skb).portid, 320 nlh->nlmsg_seq, 0, nlh); 321 if (err < 0) { 322 WARN_ON(err == -EMSGSIZE); 323 nlmsg_free(rep); 324 goto out; 325 } 326 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid, 327 MSG_DONTWAIT); 328 if (err > 0) 329 err = 0; 330 331 out: 332 if (sk) { 333 if (sk->sk_state == TCP_TIME_WAIT) 334 inet_twsk_put((struct inet_timewait_sock *)sk); 335 else 336 sock_put(sk); 337 } 338 out_nosk: 339 return err; 340 } 341 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk); 342 343 static int inet_diag_get_exact(struct sk_buff *in_skb, 344 const struct nlmsghdr *nlh, 345 struct inet_diag_req_v2 *req) 346 { 347 const struct inet_diag_handler *handler; 348 int err; 349 350 handler = inet_diag_lock_handler(req->sdiag_protocol); 351 if (IS_ERR(handler)) 352 err = PTR_ERR(handler); 353 else 354 err = handler->dump_one(in_skb, nlh, req); 355 inet_diag_unlock_handler(handler); 356 357 return err; 358 } 359 360 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 361 { 362 int words = bits >> 5; 363 364 bits &= 0x1f; 365 366 if (words) { 367 if (memcmp(a1, a2, words << 2)) 368 return 0; 369 } 370 if (bits) { 371 __be32 w1, w2; 372 __be32 mask; 373 374 w1 = a1[words]; 375 w2 = a2[words]; 376 377 mask = htonl((0xffffffff) << (32 - bits)); 378 379 if ((w1 ^ w2) & mask) 380 return 0; 381 } 382 383 return 1; 384 } 385 386 387 static int inet_diag_bc_run(const struct nlattr *_bc, 388 const struct inet_diag_entry *entry) 389 { 390 const void *bc = nla_data(_bc); 391 int len = nla_len(_bc); 392 393 while (len > 0) { 394 int yes = 1; 395 const struct inet_diag_bc_op *op = bc; 396 397 switch (op->code) { 398 case INET_DIAG_BC_NOP: 399 break; 400 case INET_DIAG_BC_JMP: 401 yes = 0; 402 break; 403 case INET_DIAG_BC_S_GE: 404 yes = entry->sport >= op[1].no; 405 break; 406 case INET_DIAG_BC_S_LE: 407 yes = entry->sport <= op[1].no; 408 break; 409 case INET_DIAG_BC_D_GE: 410 yes = entry->dport >= op[1].no; 411 break; 412 case INET_DIAG_BC_D_LE: 413 yes = entry->dport <= op[1].no; 414 break; 415 case INET_DIAG_BC_AUTO: 416 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 417 break; 418 case INET_DIAG_BC_S_COND: 419 case INET_DIAG_BC_D_COND: { 420 struct inet_diag_hostcond *cond; 421 __be32 *addr; 422 423 cond = (struct inet_diag_hostcond *)(op + 1); 424 if (cond->port != -1 && 425 cond->port != (op->code == INET_DIAG_BC_S_COND ? 426 entry->sport : entry->dport)) { 427 yes = 0; 428 break; 429 } 430 431 if (cond->prefix_len == 0) 432 break; 433 434 if (op->code == INET_DIAG_BC_S_COND) 435 addr = entry->saddr; 436 else 437 addr = entry->daddr; 438 439 if (bitstring_match(addr, cond->addr, 440 cond->prefix_len)) 441 break; 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, cond->addr, 447 cond->prefix_len)) 448 break; 449 } 450 yes = 0; 451 break; 452 } 453 } 454 455 if (yes) { 456 len -= op->yes; 457 bc += op->yes; 458 } else { 459 len -= op->no; 460 bc += op->no; 461 } 462 } 463 return len == 0; 464 } 465 466 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) 467 { 468 struct inet_diag_entry entry; 469 struct inet_sock *inet = inet_sk(sk); 470 471 if (bc == NULL) 472 return 1; 473 474 entry.family = sk->sk_family; 475 #if IS_ENABLED(CONFIG_IPV6) 476 if (entry.family == AF_INET6) { 477 struct ipv6_pinfo *np = inet6_sk(sk); 478 479 entry.saddr = np->rcv_saddr.s6_addr32; 480 entry.daddr = np->daddr.s6_addr32; 481 } else 482 #endif 483 { 484 entry.saddr = &inet->inet_rcv_saddr; 485 entry.daddr = &inet->inet_daddr; 486 } 487 entry.sport = inet->inet_num; 488 entry.dport = ntohs(inet->inet_dport); 489 entry.userlocks = sk->sk_userlocks; 490 491 return inet_diag_bc_run(bc, &entry); 492 } 493 EXPORT_SYMBOL_GPL(inet_diag_bc_sk); 494 495 static int valid_cc(const void *bc, int len, int cc) 496 { 497 while (len >= 0) { 498 const struct inet_diag_bc_op *op = bc; 499 500 if (cc > len) 501 return 0; 502 if (cc == len) 503 return 1; 504 if (op->yes < 4 || op->yes & 3) 505 return 0; 506 len -= op->yes; 507 bc += op->yes; 508 } 509 return 0; 510 } 511 512 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 513 { 514 const void *bc = bytecode; 515 int len = bytecode_len; 516 517 while (len > 0) { 518 const struct inet_diag_bc_op *op = bc; 519 520 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 521 switch (op->code) { 522 case INET_DIAG_BC_AUTO: 523 case INET_DIAG_BC_S_COND: 524 case INET_DIAG_BC_D_COND: 525 case INET_DIAG_BC_S_GE: 526 case INET_DIAG_BC_S_LE: 527 case INET_DIAG_BC_D_GE: 528 case INET_DIAG_BC_D_LE: 529 case INET_DIAG_BC_JMP: 530 if (op->no < 4 || op->no > len + 4 || op->no & 3) 531 return -EINVAL; 532 if (op->no < len && 533 !valid_cc(bytecode, bytecode_len, len - op->no)) 534 return -EINVAL; 535 break; 536 case INET_DIAG_BC_NOP: 537 break; 538 default: 539 return -EINVAL; 540 } 541 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3) 542 return -EINVAL; 543 bc += op->yes; 544 len -= op->yes; 545 } 546 return len == 0 ? 0 : -EINVAL; 547 } 548 549 static int inet_csk_diag_dump(struct sock *sk, 550 struct sk_buff *skb, 551 struct netlink_callback *cb, 552 struct inet_diag_req_v2 *r, 553 const struct nlattr *bc) 554 { 555 if (!inet_diag_bc_sk(bc, sk)) 556 return 0; 557 558 return inet_csk_diag_fill(sk, skb, r, 559 sk_user_ns(NETLINK_CB(cb->skb).ssk), 560 NETLINK_CB(cb->skb).portid, 561 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 562 } 563 564 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 565 struct sk_buff *skb, 566 struct netlink_callback *cb, 567 struct inet_diag_req_v2 *r, 568 const struct nlattr *bc) 569 { 570 if (bc != NULL) { 571 struct inet_diag_entry entry; 572 573 entry.family = tw->tw_family; 574 #if IS_ENABLED(CONFIG_IPV6) 575 if (tw->tw_family == AF_INET6) { 576 struct inet6_timewait_sock *tw6 = 577 inet6_twsk((struct sock *)tw); 578 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 579 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 580 } else 581 #endif 582 { 583 entry.saddr = &tw->tw_rcv_saddr; 584 entry.daddr = &tw->tw_daddr; 585 } 586 entry.sport = tw->tw_num; 587 entry.dport = ntohs(tw->tw_dport); 588 entry.userlocks = 0; 589 590 if (!inet_diag_bc_run(bc, &entry)) 591 return 0; 592 } 593 594 return inet_twsk_diag_fill(tw, skb, r, 595 NETLINK_CB(cb->skb).portid, 596 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 597 } 598 599 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 600 struct request_sock *req, 601 struct user_namespace *user_ns, 602 u32 portid, u32 seq, 603 const struct nlmsghdr *unlh) 604 { 605 const struct inet_request_sock *ireq = inet_rsk(req); 606 struct inet_sock *inet = inet_sk(sk); 607 struct inet_diag_msg *r; 608 struct nlmsghdr *nlh; 609 long tmo; 610 611 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 612 NLM_F_MULTI); 613 if (!nlh) 614 return -EMSGSIZE; 615 616 r = nlmsg_data(nlh); 617 r->idiag_family = sk->sk_family; 618 r->idiag_state = TCP_SYN_RECV; 619 r->idiag_timer = 1; 620 r->idiag_retrans = req->retrans; 621 622 r->id.idiag_if = sk->sk_bound_dev_if; 623 sock_diag_save_cookie(req, r->id.idiag_cookie); 624 625 tmo = req->expires - jiffies; 626 if (tmo < 0) 627 tmo = 0; 628 629 r->id.idiag_sport = inet->inet_sport; 630 r->id.idiag_dport = ireq->rmt_port; 631 r->id.idiag_src[0] = ireq->loc_addr; 632 r->id.idiag_dst[0] = ireq->rmt_addr; 633 r->idiag_expires = jiffies_to_msecs(tmo); 634 r->idiag_rqueue = 0; 635 r->idiag_wqueue = 0; 636 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); 637 r->idiag_inode = 0; 638 #if IS_ENABLED(CONFIG_IPV6) 639 if (r->idiag_family == AF_INET6) { 640 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr; 641 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr; 642 } 643 #endif 644 645 return nlmsg_end(skb, nlh); 646 } 647 648 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 649 struct netlink_callback *cb, 650 struct inet_diag_req_v2 *r, 651 const struct nlattr *bc) 652 { 653 struct inet_diag_entry entry; 654 struct inet_connection_sock *icsk = inet_csk(sk); 655 struct listen_sock *lopt; 656 struct inet_sock *inet = inet_sk(sk); 657 int j, s_j; 658 int reqnum, s_reqnum; 659 int err = 0; 660 661 s_j = cb->args[3]; 662 s_reqnum = cb->args[4]; 663 664 if (s_j > 0) 665 s_j--; 666 667 entry.family = sk->sk_family; 668 669 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 670 671 lopt = icsk->icsk_accept_queue.listen_opt; 672 if (!lopt || !lopt->qlen) 673 goto out; 674 675 if (bc != NULL) { 676 entry.sport = inet->inet_num; 677 entry.userlocks = sk->sk_userlocks; 678 } 679 680 for (j = s_j; j < lopt->nr_table_entries; j++) { 681 struct request_sock *req, *head = lopt->syn_table[j]; 682 683 reqnum = 0; 684 for (req = head; req; reqnum++, req = req->dl_next) { 685 struct inet_request_sock *ireq = inet_rsk(req); 686 687 if (reqnum < s_reqnum) 688 continue; 689 if (r->id.idiag_dport != ireq->rmt_port && 690 r->id.idiag_dport) 691 continue; 692 693 if (bc) { 694 entry.saddr = 695 #if IS_ENABLED(CONFIG_IPV6) 696 (entry.family == AF_INET6) ? 697 inet6_rsk(req)->loc_addr.s6_addr32 : 698 #endif 699 &ireq->loc_addr; 700 entry.daddr = 701 #if IS_ENABLED(CONFIG_IPV6) 702 (entry.family == AF_INET6) ? 703 inet6_rsk(req)->rmt_addr.s6_addr32 : 704 #endif 705 &ireq->rmt_addr; 706 entry.dport = ntohs(ireq->rmt_port); 707 708 if (!inet_diag_bc_run(bc, &entry)) 709 continue; 710 } 711 712 err = inet_diag_fill_req(skb, sk, req, 713 sk_user_ns(NETLINK_CB(cb->skb).ssk), 714 NETLINK_CB(cb->skb).portid, 715 cb->nlh->nlmsg_seq, cb->nlh); 716 if (err < 0) { 717 cb->args[3] = j + 1; 718 cb->args[4] = reqnum; 719 goto out; 720 } 721 } 722 723 s_reqnum = 0; 724 } 725 726 out: 727 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 728 729 return err; 730 } 731 732 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, 733 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc) 734 { 735 int i, num; 736 int s_i, s_num; 737 struct net *net = sock_net(skb->sk); 738 739 s_i = cb->args[1]; 740 s_num = num = cb->args[2]; 741 742 if (cb->args[0] == 0) { 743 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 744 goto skip_listen_ht; 745 746 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 747 struct sock *sk; 748 struct hlist_nulls_node *node; 749 struct inet_listen_hashbucket *ilb; 750 751 num = 0; 752 ilb = &hashinfo->listening_hash[i]; 753 spin_lock_bh(&ilb->lock); 754 sk_nulls_for_each(sk, node, &ilb->head) { 755 struct inet_sock *inet = inet_sk(sk); 756 757 if (!net_eq(sock_net(sk), net)) 758 continue; 759 760 if (num < s_num) { 761 num++; 762 continue; 763 } 764 765 if (r->sdiag_family != AF_UNSPEC && 766 sk->sk_family != r->sdiag_family) 767 goto next_listen; 768 769 if (r->id.idiag_sport != inet->inet_sport && 770 r->id.idiag_sport) 771 goto next_listen; 772 773 if (!(r->idiag_states & TCPF_LISTEN) || 774 r->id.idiag_dport || 775 cb->args[3] > 0) 776 goto syn_recv; 777 778 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 779 spin_unlock_bh(&ilb->lock); 780 goto done; 781 } 782 783 syn_recv: 784 if (!(r->idiag_states & TCPF_SYN_RECV)) 785 goto next_listen; 786 787 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) { 788 spin_unlock_bh(&ilb->lock); 789 goto done; 790 } 791 792 next_listen: 793 cb->args[3] = 0; 794 cb->args[4] = 0; 795 ++num; 796 } 797 spin_unlock_bh(&ilb->lock); 798 799 s_num = 0; 800 cb->args[3] = 0; 801 cb->args[4] = 0; 802 } 803 skip_listen_ht: 804 cb->args[0] = 1; 805 s_i = num = s_num = 0; 806 } 807 808 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 809 goto out; 810 811 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 812 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 813 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 814 struct sock *sk; 815 struct hlist_nulls_node *node; 816 817 num = 0; 818 819 if (hlist_nulls_empty(&head->chain) && 820 hlist_nulls_empty(&head->twchain)) 821 continue; 822 823 if (i > s_i) 824 s_num = 0; 825 826 spin_lock_bh(lock); 827 sk_nulls_for_each(sk, node, &head->chain) { 828 struct inet_sock *inet = inet_sk(sk); 829 830 if (!net_eq(sock_net(sk), net)) 831 continue; 832 if (num < s_num) 833 goto next_normal; 834 if (!(r->idiag_states & (1 << sk->sk_state))) 835 goto next_normal; 836 if (r->sdiag_family != AF_UNSPEC && 837 sk->sk_family != r->sdiag_family) 838 goto next_normal; 839 if (r->id.idiag_sport != inet->inet_sport && 840 r->id.idiag_sport) 841 goto next_normal; 842 if (r->id.idiag_dport != inet->inet_dport && 843 r->id.idiag_dport) 844 goto next_normal; 845 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 846 spin_unlock_bh(lock); 847 goto done; 848 } 849 next_normal: 850 ++num; 851 } 852 853 if (r->idiag_states & TCPF_TIME_WAIT) { 854 struct inet_timewait_sock *tw; 855 856 inet_twsk_for_each(tw, node, 857 &head->twchain) { 858 if (!net_eq(twsk_net(tw), net)) 859 continue; 860 861 if (num < s_num) 862 goto next_dying; 863 if (r->sdiag_family != AF_UNSPEC && 864 tw->tw_family != r->sdiag_family) 865 goto next_dying; 866 if (r->id.idiag_sport != tw->tw_sport && 867 r->id.idiag_sport) 868 goto next_dying; 869 if (r->id.idiag_dport != tw->tw_dport && 870 r->id.idiag_dport) 871 goto next_dying; 872 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) { 873 spin_unlock_bh(lock); 874 goto done; 875 } 876 next_dying: 877 ++num; 878 } 879 } 880 spin_unlock_bh(lock); 881 } 882 883 done: 884 cb->args[1] = i; 885 cb->args[2] = num; 886 out: 887 ; 888 } 889 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk); 890 891 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 892 struct inet_diag_req_v2 *r, struct nlattr *bc) 893 { 894 const struct inet_diag_handler *handler; 895 896 handler = inet_diag_lock_handler(r->sdiag_protocol); 897 if (!IS_ERR(handler)) 898 handler->dump(skb, cb, r, bc); 899 inet_diag_unlock_handler(handler); 900 901 return skb->len; 902 } 903 904 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 905 { 906 struct nlattr *bc = NULL; 907 int hdrlen = sizeof(struct inet_diag_req_v2); 908 909 if (nlmsg_attrlen(cb->nlh, hdrlen)) 910 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 911 912 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc); 913 } 914 915 static inline int inet_diag_type2proto(int type) 916 { 917 switch (type) { 918 case TCPDIAG_GETSOCK: 919 return IPPROTO_TCP; 920 case DCCPDIAG_GETSOCK: 921 return IPPROTO_DCCP; 922 default: 923 return 0; 924 } 925 } 926 927 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb) 928 { 929 struct inet_diag_req *rc = nlmsg_data(cb->nlh); 930 struct inet_diag_req_v2 req; 931 struct nlattr *bc = NULL; 932 int hdrlen = sizeof(struct inet_diag_req); 933 934 req.sdiag_family = AF_UNSPEC; /* compatibility */ 935 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 936 req.idiag_ext = rc->idiag_ext; 937 req.idiag_states = rc->idiag_states; 938 req.id = rc->id; 939 940 if (nlmsg_attrlen(cb->nlh, hdrlen)) 941 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 942 943 return __inet_diag_dump(skb, cb, &req, bc); 944 } 945 946 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 947 const struct nlmsghdr *nlh) 948 { 949 struct inet_diag_req *rc = nlmsg_data(nlh); 950 struct inet_diag_req_v2 req; 951 952 req.sdiag_family = rc->idiag_family; 953 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 954 req.idiag_ext = rc->idiag_ext; 955 req.idiag_states = rc->idiag_states; 956 req.id = rc->id; 957 958 return inet_diag_get_exact(in_skb, nlh, &req); 959 } 960 961 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 962 { 963 int hdrlen = sizeof(struct inet_diag_req); 964 struct net *net = sock_net(skb->sk); 965 966 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 967 nlmsg_len(nlh) < hdrlen) 968 return -EINVAL; 969 970 if (nlh->nlmsg_flags & NLM_F_DUMP) { 971 if (nlmsg_attrlen(nlh, hdrlen)) { 972 struct nlattr *attr; 973 974 attr = nlmsg_find_attr(nlh, hdrlen, 975 INET_DIAG_REQ_BYTECODE); 976 if (attr == NULL || 977 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 978 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 979 return -EINVAL; 980 } 981 { 982 struct netlink_dump_control c = { 983 .dump = inet_diag_dump_compat, 984 }; 985 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c); 986 } 987 } 988 989 return inet_diag_get_exact_compat(skb, nlh); 990 } 991 992 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) 993 { 994 int hdrlen = sizeof(struct inet_diag_req_v2); 995 struct net *net = sock_net(skb->sk); 996 997 if (nlmsg_len(h) < hdrlen) 998 return -EINVAL; 999 1000 if (h->nlmsg_flags & NLM_F_DUMP) { 1001 if (nlmsg_attrlen(h, hdrlen)) { 1002 struct nlattr *attr; 1003 attr = nlmsg_find_attr(h, hdrlen, 1004 INET_DIAG_REQ_BYTECODE); 1005 if (attr == NULL || 1006 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 1007 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 1008 return -EINVAL; 1009 } 1010 { 1011 struct netlink_dump_control c = { 1012 .dump = inet_diag_dump, 1013 }; 1014 return netlink_dump_start(net->diag_nlsk, skb, h, &c); 1015 } 1016 } 1017 1018 return inet_diag_get_exact(skb, h, nlmsg_data(h)); 1019 } 1020 1021 static const struct sock_diag_handler inet_diag_handler = { 1022 .family = AF_INET, 1023 .dump = inet_diag_handler_dump, 1024 }; 1025 1026 static const struct sock_diag_handler inet6_diag_handler = { 1027 .family = AF_INET6, 1028 .dump = inet_diag_handler_dump, 1029 }; 1030 1031 int inet_diag_register(const struct inet_diag_handler *h) 1032 { 1033 const __u16 type = h->idiag_type; 1034 int err = -EINVAL; 1035 1036 if (type >= IPPROTO_MAX) 1037 goto out; 1038 1039 mutex_lock(&inet_diag_table_mutex); 1040 err = -EEXIST; 1041 if (inet_diag_table[type] == NULL) { 1042 inet_diag_table[type] = h; 1043 err = 0; 1044 } 1045 mutex_unlock(&inet_diag_table_mutex); 1046 out: 1047 return err; 1048 } 1049 EXPORT_SYMBOL_GPL(inet_diag_register); 1050 1051 void inet_diag_unregister(const struct inet_diag_handler *h) 1052 { 1053 const __u16 type = h->idiag_type; 1054 1055 if (type >= IPPROTO_MAX) 1056 return; 1057 1058 mutex_lock(&inet_diag_table_mutex); 1059 inet_diag_table[type] = NULL; 1060 mutex_unlock(&inet_diag_table_mutex); 1061 } 1062 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1063 1064 static int __init inet_diag_init(void) 1065 { 1066 const int inet_diag_table_size = (IPPROTO_MAX * 1067 sizeof(struct inet_diag_handler *)); 1068 int err = -ENOMEM; 1069 1070 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1071 if (!inet_diag_table) 1072 goto out; 1073 1074 err = sock_diag_register(&inet_diag_handler); 1075 if (err) 1076 goto out_free_nl; 1077 1078 err = sock_diag_register(&inet6_diag_handler); 1079 if (err) 1080 goto out_free_inet; 1081 1082 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1083 out: 1084 return err; 1085 1086 out_free_inet: 1087 sock_diag_unregister(&inet_diag_handler); 1088 out_free_nl: 1089 kfree(inet_diag_table); 1090 goto out; 1091 } 1092 1093 static void __exit inet_diag_exit(void) 1094 { 1095 sock_diag_unregister(&inet6_diag_handler); 1096 sock_diag_unregister(&inet_diag_handler); 1097 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1098 kfree(inet_diag_table); 1099 } 1100 1101 module_init(inet_diag_init); 1102 module_exit(inet_diag_exit); 1103 MODULE_LICENSE("GPL"); 1104 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */); 1105 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */); 1106