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 #define INET_DIAG_PUT(skb, attrtype, attrlen) \ 50 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) 51 52 static DEFINE_MUTEX(inet_diag_table_mutex); 53 54 static const struct inet_diag_handler *inet_diag_lock_handler(int proto) 55 { 56 if (!inet_diag_table[proto]) 57 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK, 58 NETLINK_SOCK_DIAG, AF_INET, proto); 59 60 mutex_lock(&inet_diag_table_mutex); 61 if (!inet_diag_table[proto]) 62 return ERR_PTR(-ENOENT); 63 64 return inet_diag_table[proto]; 65 } 66 67 static inline void inet_diag_unlock_handler( 68 const struct inet_diag_handler *handler) 69 { 70 mutex_unlock(&inet_diag_table_mutex); 71 } 72 73 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, 74 struct sk_buff *skb, struct inet_diag_req_v2 *req, 75 u32 pid, u32 seq, u16 nlmsg_flags, 76 const struct nlmsghdr *unlh) 77 { 78 const struct inet_sock *inet = inet_sk(sk); 79 struct inet_diag_msg *r; 80 struct nlmsghdr *nlh; 81 void *info = NULL; 82 struct inet_diag_meminfo *minfo = NULL; 83 unsigned char *b = skb_tail_pointer(skb); 84 const struct inet_diag_handler *handler; 85 int ext = req->idiag_ext; 86 87 handler = inet_diag_table[req->sdiag_protocol]; 88 BUG_ON(handler == NULL); 89 90 nlh = nlmsg_put(skb, pid, seq, unlh->nlmsg_type, sizeof(*r), 0); 91 if (!nlh) { 92 nlmsg_trim(skb, b); 93 return -EMSGSIZE; 94 } 95 nlh->nlmsg_flags = nlmsg_flags; 96 97 r = nlmsg_data(nlh); 98 BUG_ON(sk->sk_state == TCP_TIME_WAIT); 99 100 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) 101 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo)); 102 103 r->idiag_family = sk->sk_family; 104 r->idiag_state = sk->sk_state; 105 r->idiag_timer = 0; 106 r->idiag_retrans = 0; 107 108 r->id.idiag_if = sk->sk_bound_dev_if; 109 sock_diag_save_cookie(sk, r->id.idiag_cookie); 110 111 r->id.idiag_sport = inet->inet_sport; 112 r->id.idiag_dport = inet->inet_dport; 113 r->id.idiag_src[0] = inet->inet_rcv_saddr; 114 r->id.idiag_dst[0] = inet->inet_daddr; 115 116 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, 117 * hence this needs to be included regardless of socket family. 118 */ 119 if (ext & (1 << (INET_DIAG_TOS - 1))) 120 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos); 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 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 129 RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass); 130 } 131 #endif 132 133 r->idiag_uid = sock_i_uid(sk); 134 r->idiag_inode = sock_i_ino(sk); 135 136 if (minfo) { 137 minfo->idiag_rmem = sk_rmem_alloc_get(sk); 138 minfo->idiag_wmem = sk->sk_wmem_queued; 139 minfo->idiag_fmem = sk->sk_forward_alloc; 140 minfo->idiag_tmem = sk_wmem_alloc_get(sk); 141 } 142 143 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) 144 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO)) 145 goto rtattr_failure; 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 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, sizeof(struct tcp_info)); 174 175 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { 176 const size_t len = strlen(icsk->icsk_ca_ops->name); 177 178 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), 179 icsk->icsk_ca_ops->name); 180 } 181 182 handler->idiag_get_info(sk, r, info); 183 184 if (sk->sk_state < TCP_TIME_WAIT && 185 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 186 icsk->icsk_ca_ops->get_info(sk, ext, skb); 187 188 out: 189 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 190 return skb->len; 191 192 rtattr_failure: 193 nlmsg_trim(skb, b); 194 return -EMSGSIZE; 195 } 196 EXPORT_SYMBOL_GPL(inet_sk_diag_fill); 197 198 static int inet_csk_diag_fill(struct sock *sk, 199 struct sk_buff *skb, struct inet_diag_req_v2 *req, 200 u32 pid, u32 seq, u16 nlmsg_flags, 201 const struct nlmsghdr *unlh) 202 { 203 return inet_sk_diag_fill(sk, inet_csk(sk), 204 skb, req, pid, seq, nlmsg_flags, unlh); 205 } 206 207 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 208 struct sk_buff *skb, struct inet_diag_req_v2 *req, 209 u32 pid, u32 seq, u16 nlmsg_flags, 210 const struct nlmsghdr *unlh) 211 { 212 long tmo; 213 struct inet_diag_msg *r; 214 const unsigned char *previous_tail = skb_tail_pointer(skb); 215 struct nlmsghdr *nlh = nlmsg_put(skb, pid, seq, 216 unlh->nlmsg_type, sizeof(*r), 0); 217 218 if (!nlh) { 219 nlmsg_trim(skb, previous_tail); 220 return -EMSGSIZE; 221 } 222 223 r = nlmsg_data(nlh); 224 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 225 226 nlh->nlmsg_flags = nlmsg_flags; 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 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; 257 return skb->len; 258 } 259 260 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 261 struct inet_diag_req_v2 *r, u32 pid, u32 seq, u16 nlmsg_flags, 262 const struct nlmsghdr *unlh) 263 { 264 if (sk->sk_state == TCP_TIME_WAIT) 265 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 266 skb, r, pid, seq, nlmsg_flags, 267 unlh); 268 return inet_csk_diag_fill(sk, skb, r, pid, seq, nlmsg_flags, unlh); 269 } 270 271 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb, 272 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req) 273 { 274 int err; 275 struct sock *sk; 276 struct sk_buff *rep; 277 278 err = -EINVAL; 279 if (req->sdiag_family == AF_INET) { 280 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], 281 req->id.idiag_dport, req->id.idiag_src[0], 282 req->id.idiag_sport, req->id.idiag_if); 283 } 284 #if IS_ENABLED(CONFIG_IPV6) 285 else if (req->sdiag_family == AF_INET6) { 286 sk = inet6_lookup(&init_net, hashinfo, 287 (struct in6_addr *)req->id.idiag_dst, 288 req->id.idiag_dport, 289 (struct in6_addr *)req->id.idiag_src, 290 req->id.idiag_sport, 291 req->id.idiag_if); 292 } 293 #endif 294 else { 295 goto out_nosk; 296 } 297 298 err = -ENOENT; 299 if (sk == NULL) 300 goto out_nosk; 301 302 err = sock_diag_check_cookie(sk, req->id.idiag_cookie); 303 if (err) 304 goto out; 305 306 err = -ENOMEM; 307 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 308 sizeof(struct inet_diag_meminfo) + 309 sizeof(struct tcp_info) + 64)), 310 GFP_KERNEL); 311 if (!rep) 312 goto out; 313 314 err = sk_diag_fill(sk, rep, req, 315 NETLINK_CB(in_skb).pid, 316 nlh->nlmsg_seq, 0, nlh); 317 if (err < 0) { 318 WARN_ON(err == -EMSGSIZE); 319 kfree_skb(rep); 320 goto out; 321 } 322 err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid, 323 MSG_DONTWAIT); 324 if (err > 0) 325 err = 0; 326 327 out: 328 if (sk) { 329 if (sk->sk_state == TCP_TIME_WAIT) 330 inet_twsk_put((struct inet_timewait_sock *)sk); 331 else 332 sock_put(sk); 333 } 334 out_nosk: 335 return err; 336 } 337 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk); 338 339 static int inet_diag_get_exact(struct sk_buff *in_skb, 340 const struct nlmsghdr *nlh, 341 struct inet_diag_req_v2 *req) 342 { 343 const struct inet_diag_handler *handler; 344 int err; 345 346 handler = inet_diag_lock_handler(req->sdiag_protocol); 347 if (IS_ERR(handler)) 348 err = PTR_ERR(handler); 349 else 350 err = handler->dump_one(in_skb, nlh, req); 351 inet_diag_unlock_handler(handler); 352 353 return err; 354 } 355 356 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 357 { 358 int words = bits >> 5; 359 360 bits &= 0x1f; 361 362 if (words) { 363 if (memcmp(a1, a2, words << 2)) 364 return 0; 365 } 366 if (bits) { 367 __be32 w1, w2; 368 __be32 mask; 369 370 w1 = a1[words]; 371 w2 = a2[words]; 372 373 mask = htonl((0xffffffff) << (32 - bits)); 374 375 if ((w1 ^ w2) & mask) 376 return 0; 377 } 378 379 return 1; 380 } 381 382 383 static int inet_diag_bc_run(const struct nlattr *_bc, 384 const struct inet_diag_entry *entry) 385 { 386 const void *bc = nla_data(_bc); 387 int len = nla_len(_bc); 388 389 while (len > 0) { 390 int yes = 1; 391 const struct inet_diag_bc_op *op = bc; 392 393 switch (op->code) { 394 case INET_DIAG_BC_NOP: 395 break; 396 case INET_DIAG_BC_JMP: 397 yes = 0; 398 break; 399 case INET_DIAG_BC_S_GE: 400 yes = entry->sport >= op[1].no; 401 break; 402 case INET_DIAG_BC_S_LE: 403 yes = entry->sport <= op[1].no; 404 break; 405 case INET_DIAG_BC_D_GE: 406 yes = entry->dport >= op[1].no; 407 break; 408 case INET_DIAG_BC_D_LE: 409 yes = entry->dport <= op[1].no; 410 break; 411 case INET_DIAG_BC_AUTO: 412 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 413 break; 414 case INET_DIAG_BC_S_COND: 415 case INET_DIAG_BC_D_COND: { 416 struct inet_diag_hostcond *cond; 417 __be32 *addr; 418 419 cond = (struct inet_diag_hostcond *)(op + 1); 420 if (cond->port != -1 && 421 cond->port != (op->code == INET_DIAG_BC_S_COND ? 422 entry->sport : entry->dport)) { 423 yes = 0; 424 break; 425 } 426 427 if (cond->prefix_len == 0) 428 break; 429 430 if (op->code == INET_DIAG_BC_S_COND) 431 addr = entry->saddr; 432 else 433 addr = entry->daddr; 434 435 if (bitstring_match(addr, cond->addr, 436 cond->prefix_len)) 437 break; 438 if (entry->family == AF_INET6 && 439 cond->family == AF_INET) { 440 if (addr[0] == 0 && addr[1] == 0 && 441 addr[2] == htonl(0xffff) && 442 bitstring_match(addr + 3, cond->addr, 443 cond->prefix_len)) 444 break; 445 } 446 yes = 0; 447 break; 448 } 449 } 450 451 if (yes) { 452 len -= op->yes; 453 bc += op->yes; 454 } else { 455 len -= op->no; 456 bc += op->no; 457 } 458 } 459 return len == 0; 460 } 461 462 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) 463 { 464 struct inet_diag_entry entry; 465 struct inet_sock *inet = inet_sk(sk); 466 467 if (bc == NULL) 468 return 1; 469 470 entry.family = sk->sk_family; 471 #if IS_ENABLED(CONFIG_IPV6) 472 if (entry.family == AF_INET6) { 473 struct ipv6_pinfo *np = inet6_sk(sk); 474 475 entry.saddr = np->rcv_saddr.s6_addr32; 476 entry.daddr = np->daddr.s6_addr32; 477 } else 478 #endif 479 { 480 entry.saddr = &inet->inet_rcv_saddr; 481 entry.daddr = &inet->inet_daddr; 482 } 483 entry.sport = inet->inet_num; 484 entry.dport = ntohs(inet->inet_dport); 485 entry.userlocks = sk->sk_userlocks; 486 487 return inet_diag_bc_run(bc, &entry); 488 } 489 EXPORT_SYMBOL_GPL(inet_diag_bc_sk); 490 491 static int valid_cc(const void *bc, int len, int cc) 492 { 493 while (len >= 0) { 494 const struct inet_diag_bc_op *op = bc; 495 496 if (cc > len) 497 return 0; 498 if (cc == len) 499 return 1; 500 if (op->yes < 4 || op->yes & 3) 501 return 0; 502 len -= op->yes; 503 bc += op->yes; 504 } 505 return 0; 506 } 507 508 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 509 { 510 const void *bc = bytecode; 511 int len = bytecode_len; 512 513 while (len > 0) { 514 const struct inet_diag_bc_op *op = bc; 515 516 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 517 switch (op->code) { 518 case INET_DIAG_BC_AUTO: 519 case INET_DIAG_BC_S_COND: 520 case INET_DIAG_BC_D_COND: 521 case INET_DIAG_BC_S_GE: 522 case INET_DIAG_BC_S_LE: 523 case INET_DIAG_BC_D_GE: 524 case INET_DIAG_BC_D_LE: 525 case INET_DIAG_BC_JMP: 526 if (op->no < 4 || op->no > len + 4 || op->no & 3) 527 return -EINVAL; 528 if (op->no < len && 529 !valid_cc(bytecode, bytecode_len, len - op->no)) 530 return -EINVAL; 531 break; 532 case INET_DIAG_BC_NOP: 533 break; 534 default: 535 return -EINVAL; 536 } 537 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3) 538 return -EINVAL; 539 bc += op->yes; 540 len -= op->yes; 541 } 542 return len == 0 ? 0 : -EINVAL; 543 } 544 545 static int inet_csk_diag_dump(struct sock *sk, 546 struct sk_buff *skb, 547 struct netlink_callback *cb, 548 struct inet_diag_req_v2 *r, 549 const struct nlattr *bc) 550 { 551 if (!inet_diag_bc_sk(bc, sk)) 552 return 0; 553 554 return inet_csk_diag_fill(sk, skb, r, 555 NETLINK_CB(cb->skb).pid, 556 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 557 } 558 559 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 560 struct sk_buff *skb, 561 struct netlink_callback *cb, 562 struct inet_diag_req_v2 *r, 563 const struct nlattr *bc) 564 { 565 if (bc != NULL) { 566 struct inet_diag_entry entry; 567 568 entry.family = tw->tw_family; 569 #if IS_ENABLED(CONFIG_IPV6) 570 if (tw->tw_family == AF_INET6) { 571 struct inet6_timewait_sock *tw6 = 572 inet6_twsk((struct sock *)tw); 573 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 574 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 575 } else 576 #endif 577 { 578 entry.saddr = &tw->tw_rcv_saddr; 579 entry.daddr = &tw->tw_daddr; 580 } 581 entry.sport = tw->tw_num; 582 entry.dport = ntohs(tw->tw_dport); 583 entry.userlocks = 0; 584 585 if (!inet_diag_bc_run(bc, &entry)) 586 return 0; 587 } 588 589 return inet_twsk_diag_fill(tw, skb, r, 590 NETLINK_CB(cb->skb).pid, 591 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 592 } 593 594 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 595 struct request_sock *req, u32 pid, u32 seq, 596 const struct nlmsghdr *unlh) 597 { 598 const struct inet_request_sock *ireq = inet_rsk(req); 599 struct inet_sock *inet = inet_sk(sk); 600 unsigned char *b = skb_tail_pointer(skb); 601 struct inet_diag_msg *r; 602 struct nlmsghdr *nlh; 603 long tmo; 604 605 nlh = nlmsg_put(skb, pid, seq, unlh->nlmsg_type, sizeof(*r), 0); 606 if (!nlh) { 607 nlmsg_trim(skb, b); 608 return -1; 609 } 610 nlh->nlmsg_flags = NLM_F_MULTI; 611 r = nlmsg_data(nlh); 612 613 r->idiag_family = sk->sk_family; 614 r->idiag_state = TCP_SYN_RECV; 615 r->idiag_timer = 1; 616 r->idiag_retrans = req->retrans; 617 618 r->id.idiag_if = sk->sk_bound_dev_if; 619 sock_diag_save_cookie(req, r->id.idiag_cookie); 620 621 tmo = req->expires - jiffies; 622 if (tmo < 0) 623 tmo = 0; 624 625 r->id.idiag_sport = inet->inet_sport; 626 r->id.idiag_dport = ireq->rmt_port; 627 r->id.idiag_src[0] = ireq->loc_addr; 628 r->id.idiag_dst[0] = ireq->rmt_addr; 629 r->idiag_expires = jiffies_to_msecs(tmo); 630 r->idiag_rqueue = 0; 631 r->idiag_wqueue = 0; 632 r->idiag_uid = sock_i_uid(sk); 633 r->idiag_inode = 0; 634 #if IS_ENABLED(CONFIG_IPV6) 635 if (r->idiag_family == AF_INET6) { 636 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr; 637 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr; 638 } 639 #endif 640 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 641 642 return skb->len; 643 } 644 645 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 646 struct netlink_callback *cb, 647 struct inet_diag_req_v2 *r, 648 const struct nlattr *bc) 649 { 650 struct inet_diag_entry entry; 651 struct inet_connection_sock *icsk = inet_csk(sk); 652 struct listen_sock *lopt; 653 struct inet_sock *inet = inet_sk(sk); 654 int j, s_j; 655 int reqnum, s_reqnum; 656 int err = 0; 657 658 s_j = cb->args[3]; 659 s_reqnum = cb->args[4]; 660 661 if (s_j > 0) 662 s_j--; 663 664 entry.family = sk->sk_family; 665 666 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 667 668 lopt = icsk->icsk_accept_queue.listen_opt; 669 if (!lopt || !lopt->qlen) 670 goto out; 671 672 if (bc != NULL) { 673 entry.sport = inet->inet_num; 674 entry.userlocks = sk->sk_userlocks; 675 } 676 677 for (j = s_j; j < lopt->nr_table_entries; j++) { 678 struct request_sock *req, *head = lopt->syn_table[j]; 679 680 reqnum = 0; 681 for (req = head; req; reqnum++, req = req->dl_next) { 682 struct inet_request_sock *ireq = inet_rsk(req); 683 684 if (reqnum < s_reqnum) 685 continue; 686 if (r->id.idiag_dport != ireq->rmt_port && 687 r->id.idiag_dport) 688 continue; 689 690 if (bc) { 691 entry.saddr = 692 #if IS_ENABLED(CONFIG_IPV6) 693 (entry.family == AF_INET6) ? 694 inet6_rsk(req)->loc_addr.s6_addr32 : 695 #endif 696 &ireq->loc_addr; 697 entry.daddr = 698 #if IS_ENABLED(CONFIG_IPV6) 699 (entry.family == AF_INET6) ? 700 inet6_rsk(req)->rmt_addr.s6_addr32 : 701 #endif 702 &ireq->rmt_addr; 703 entry.dport = ntohs(ireq->rmt_port); 704 705 if (!inet_diag_bc_run(bc, &entry)) 706 continue; 707 } 708 709 err = inet_diag_fill_req(skb, sk, req, 710 NETLINK_CB(cb->skb).pid, 711 cb->nlh->nlmsg_seq, cb->nlh); 712 if (err < 0) { 713 cb->args[3] = j + 1; 714 cb->args[4] = reqnum; 715 goto out; 716 } 717 } 718 719 s_reqnum = 0; 720 } 721 722 out: 723 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 724 725 return err; 726 } 727 728 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, 729 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc) 730 { 731 int i, num; 732 int s_i, s_num; 733 734 s_i = cb->args[1]; 735 s_num = num = cb->args[2]; 736 737 if (cb->args[0] == 0) { 738 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 739 goto skip_listen_ht; 740 741 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 742 struct sock *sk; 743 struct hlist_nulls_node *node; 744 struct inet_listen_hashbucket *ilb; 745 746 num = 0; 747 ilb = &hashinfo->listening_hash[i]; 748 spin_lock_bh(&ilb->lock); 749 sk_nulls_for_each(sk, node, &ilb->head) { 750 struct inet_sock *inet = inet_sk(sk); 751 752 if (num < s_num) { 753 num++; 754 continue; 755 } 756 757 if (r->sdiag_family != AF_UNSPEC && 758 sk->sk_family != r->sdiag_family) 759 goto next_listen; 760 761 if (r->id.idiag_sport != inet->inet_sport && 762 r->id.idiag_sport) 763 goto next_listen; 764 765 if (!(r->idiag_states & TCPF_LISTEN) || 766 r->id.idiag_dport || 767 cb->args[3] > 0) 768 goto syn_recv; 769 770 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 771 spin_unlock_bh(&ilb->lock); 772 goto done; 773 } 774 775 syn_recv: 776 if (!(r->idiag_states & TCPF_SYN_RECV)) 777 goto next_listen; 778 779 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) { 780 spin_unlock_bh(&ilb->lock); 781 goto done; 782 } 783 784 next_listen: 785 cb->args[3] = 0; 786 cb->args[4] = 0; 787 ++num; 788 } 789 spin_unlock_bh(&ilb->lock); 790 791 s_num = 0; 792 cb->args[3] = 0; 793 cb->args[4] = 0; 794 } 795 skip_listen_ht: 796 cb->args[0] = 1; 797 s_i = num = s_num = 0; 798 } 799 800 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 801 goto out; 802 803 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 804 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 805 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 806 struct sock *sk; 807 struct hlist_nulls_node *node; 808 809 num = 0; 810 811 if (hlist_nulls_empty(&head->chain) && 812 hlist_nulls_empty(&head->twchain)) 813 continue; 814 815 if (i > s_i) 816 s_num = 0; 817 818 spin_lock_bh(lock); 819 sk_nulls_for_each(sk, node, &head->chain) { 820 struct inet_sock *inet = inet_sk(sk); 821 822 if (num < s_num) 823 goto next_normal; 824 if (!(r->idiag_states & (1 << sk->sk_state))) 825 goto next_normal; 826 if (r->sdiag_family != AF_UNSPEC && 827 sk->sk_family != r->sdiag_family) 828 goto next_normal; 829 if (r->id.idiag_sport != inet->inet_sport && 830 r->id.idiag_sport) 831 goto next_normal; 832 if (r->id.idiag_dport != inet->inet_dport && 833 r->id.idiag_dport) 834 goto next_normal; 835 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 836 spin_unlock_bh(lock); 837 goto done; 838 } 839 next_normal: 840 ++num; 841 } 842 843 if (r->idiag_states & TCPF_TIME_WAIT) { 844 struct inet_timewait_sock *tw; 845 846 inet_twsk_for_each(tw, node, 847 &head->twchain) { 848 849 if (num < s_num) 850 goto next_dying; 851 if (r->sdiag_family != AF_UNSPEC && 852 tw->tw_family != r->sdiag_family) 853 goto next_dying; 854 if (r->id.idiag_sport != tw->tw_sport && 855 r->id.idiag_sport) 856 goto next_dying; 857 if (r->id.idiag_dport != tw->tw_dport && 858 r->id.idiag_dport) 859 goto next_dying; 860 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) { 861 spin_unlock_bh(lock); 862 goto done; 863 } 864 next_dying: 865 ++num; 866 } 867 } 868 spin_unlock_bh(lock); 869 } 870 871 done: 872 cb->args[1] = i; 873 cb->args[2] = num; 874 out: 875 ; 876 } 877 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk); 878 879 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 880 struct inet_diag_req_v2 *r, struct nlattr *bc) 881 { 882 const struct inet_diag_handler *handler; 883 884 handler = inet_diag_lock_handler(r->sdiag_protocol); 885 if (!IS_ERR(handler)) 886 handler->dump(skb, cb, r, bc); 887 inet_diag_unlock_handler(handler); 888 889 return skb->len; 890 } 891 892 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 893 { 894 struct nlattr *bc = NULL; 895 int hdrlen = sizeof(struct inet_diag_req_v2); 896 897 if (nlmsg_attrlen(cb->nlh, hdrlen)) 898 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 899 900 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc); 901 } 902 903 static inline int inet_diag_type2proto(int type) 904 { 905 switch (type) { 906 case TCPDIAG_GETSOCK: 907 return IPPROTO_TCP; 908 case DCCPDIAG_GETSOCK: 909 return IPPROTO_DCCP; 910 default: 911 return 0; 912 } 913 } 914 915 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb) 916 { 917 struct inet_diag_req *rc = nlmsg_data(cb->nlh); 918 struct inet_diag_req_v2 req; 919 struct nlattr *bc = NULL; 920 int hdrlen = sizeof(struct inet_diag_req); 921 922 req.sdiag_family = AF_UNSPEC; /* compatibility */ 923 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 924 req.idiag_ext = rc->idiag_ext; 925 req.idiag_states = rc->idiag_states; 926 req.id = rc->id; 927 928 if (nlmsg_attrlen(cb->nlh, hdrlen)) 929 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 930 931 return __inet_diag_dump(skb, cb, &req, bc); 932 } 933 934 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 935 const struct nlmsghdr *nlh) 936 { 937 struct inet_diag_req *rc = nlmsg_data(nlh); 938 struct inet_diag_req_v2 req; 939 940 req.sdiag_family = rc->idiag_family; 941 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 942 req.idiag_ext = rc->idiag_ext; 943 req.idiag_states = rc->idiag_states; 944 req.id = rc->id; 945 946 return inet_diag_get_exact(in_skb, nlh, &req); 947 } 948 949 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 950 { 951 int hdrlen = sizeof(struct inet_diag_req); 952 953 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 954 nlmsg_len(nlh) < hdrlen) 955 return -EINVAL; 956 957 if (nlh->nlmsg_flags & NLM_F_DUMP) { 958 if (nlmsg_attrlen(nlh, hdrlen)) { 959 struct nlattr *attr; 960 961 attr = nlmsg_find_attr(nlh, hdrlen, 962 INET_DIAG_REQ_BYTECODE); 963 if (attr == NULL || 964 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 965 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 966 return -EINVAL; 967 } 968 { 969 struct netlink_dump_control c = { 970 .dump = inet_diag_dump_compat, 971 }; 972 return netlink_dump_start(sock_diag_nlsk, skb, nlh, &c); 973 } 974 } 975 976 return inet_diag_get_exact_compat(skb, nlh); 977 } 978 979 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) 980 { 981 int hdrlen = sizeof(struct inet_diag_req_v2); 982 983 if (nlmsg_len(h) < hdrlen) 984 return -EINVAL; 985 986 if (h->nlmsg_flags & NLM_F_DUMP) { 987 if (nlmsg_attrlen(h, hdrlen)) { 988 struct nlattr *attr; 989 attr = nlmsg_find_attr(h, hdrlen, 990 INET_DIAG_REQ_BYTECODE); 991 if (attr == NULL || 992 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 993 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 994 return -EINVAL; 995 } 996 { 997 struct netlink_dump_control c = { 998 .dump = inet_diag_dump, 999 }; 1000 return netlink_dump_start(sock_diag_nlsk, skb, h, &c); 1001 } 1002 } 1003 1004 return inet_diag_get_exact(skb, h, nlmsg_data(h)); 1005 } 1006 1007 static const struct sock_diag_handler inet_diag_handler = { 1008 .family = AF_INET, 1009 .dump = inet_diag_handler_dump, 1010 }; 1011 1012 static const struct sock_diag_handler inet6_diag_handler = { 1013 .family = AF_INET6, 1014 .dump = inet_diag_handler_dump, 1015 }; 1016 1017 int inet_diag_register(const struct inet_diag_handler *h) 1018 { 1019 const __u16 type = h->idiag_type; 1020 int err = -EINVAL; 1021 1022 if (type >= IPPROTO_MAX) 1023 goto out; 1024 1025 mutex_lock(&inet_diag_table_mutex); 1026 err = -EEXIST; 1027 if (inet_diag_table[type] == NULL) { 1028 inet_diag_table[type] = h; 1029 err = 0; 1030 } 1031 mutex_unlock(&inet_diag_table_mutex); 1032 out: 1033 return err; 1034 } 1035 EXPORT_SYMBOL_GPL(inet_diag_register); 1036 1037 void inet_diag_unregister(const struct inet_diag_handler *h) 1038 { 1039 const __u16 type = h->idiag_type; 1040 1041 if (type >= IPPROTO_MAX) 1042 return; 1043 1044 mutex_lock(&inet_diag_table_mutex); 1045 inet_diag_table[type] = NULL; 1046 mutex_unlock(&inet_diag_table_mutex); 1047 } 1048 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1049 1050 static int __init inet_diag_init(void) 1051 { 1052 const int inet_diag_table_size = (IPPROTO_MAX * 1053 sizeof(struct inet_diag_handler *)); 1054 int err = -ENOMEM; 1055 1056 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1057 if (!inet_diag_table) 1058 goto out; 1059 1060 err = sock_diag_register(&inet_diag_handler); 1061 if (err) 1062 goto out_free_nl; 1063 1064 err = sock_diag_register(&inet6_diag_handler); 1065 if (err) 1066 goto out_free_inet; 1067 1068 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1069 out: 1070 return err; 1071 1072 out_free_inet: 1073 sock_diag_unregister(&inet_diag_handler); 1074 out_free_nl: 1075 kfree(inet_diag_table); 1076 goto out; 1077 } 1078 1079 static void __exit inet_diag_exit(void) 1080 { 1081 sock_diag_unregister(&inet6_diag_handler); 1082 sock_diag_unregister(&inet_diag_handler); 1083 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1084 kfree(inet_diag_table); 1085 } 1086 1087 module_init(inet_diag_init); 1088 module_exit(inet_diag_exit); 1089 MODULE_LICENSE("GPL"); 1090 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */); 1091 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */); 1092