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 *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)); 91 nlh->nlmsg_flags = nlmsg_flags; 92 93 r = NLMSG_DATA(nlh); 94 BUG_ON(sk->sk_state == TCP_TIME_WAIT); 95 96 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) 97 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo)); 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 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, 113 * hence this needs to be included regardless of socket family. 114 */ 115 if (ext & (1 << (INET_DIAG_TOS - 1))) 116 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos); 117 118 #if IS_ENABLED(CONFIG_IPV6) 119 if (r->idiag_family == AF_INET6) { 120 const struct ipv6_pinfo *np = inet6_sk(sk); 121 122 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr; 123 *(struct in6_addr *)r->id.idiag_dst = np->daddr; 124 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 125 RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass); 126 } 127 #endif 128 129 r->idiag_uid = sock_i_uid(sk); 130 r->idiag_inode = sock_i_ino(sk); 131 132 if (minfo) { 133 minfo->idiag_rmem = sk_rmem_alloc_get(sk); 134 minfo->idiag_wmem = sk->sk_wmem_queued; 135 minfo->idiag_fmem = sk->sk_forward_alloc; 136 minfo->idiag_tmem = sk_wmem_alloc_get(sk); 137 } 138 139 if (icsk == NULL) { 140 r->idiag_rqueue = r->idiag_wqueue = 0; 141 goto out; 142 } 143 144 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) 145 146 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 147 r->idiag_timer = 1; 148 r->idiag_retrans = icsk->icsk_retransmits; 149 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 150 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 151 r->idiag_timer = 4; 152 r->idiag_retrans = icsk->icsk_probes_out; 153 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 154 } else if (timer_pending(&sk->sk_timer)) { 155 r->idiag_timer = 2; 156 r->idiag_retrans = icsk->icsk_probes_out; 157 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 158 } else { 159 r->idiag_timer = 0; 160 r->idiag_expires = 0; 161 } 162 #undef EXPIRES_IN_MS 163 164 if (ext & (1 << (INET_DIAG_INFO - 1))) 165 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, sizeof(struct tcp_info)); 166 167 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { 168 const size_t len = strlen(icsk->icsk_ca_ops->name); 169 170 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), 171 icsk->icsk_ca_ops->name); 172 } 173 174 handler->idiag_get_info(sk, r, info); 175 176 if (sk->sk_state < TCP_TIME_WAIT && 177 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 178 icsk->icsk_ca_ops->get_info(sk, ext, skb); 179 180 out: 181 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 182 return skb->len; 183 184 rtattr_failure: 185 nlmsg_failure: 186 nlmsg_trim(skb, b); 187 return -EMSGSIZE; 188 } 189 EXPORT_SYMBOL_GPL(inet_sk_diag_fill); 190 191 static int inet_csk_diag_fill(struct sock *sk, 192 struct sk_buff *skb, struct inet_diag_req *req, 193 u32 pid, u32 seq, u16 nlmsg_flags, 194 const struct nlmsghdr *unlh) 195 { 196 return inet_sk_diag_fill(sk, inet_csk(sk), 197 skb, req, pid, seq, nlmsg_flags, unlh); 198 } 199 200 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 201 struct sk_buff *skb, struct inet_diag_req *req, 202 u32 pid, u32 seq, u16 nlmsg_flags, 203 const struct nlmsghdr *unlh) 204 { 205 long tmo; 206 struct inet_diag_msg *r; 207 const unsigned char *previous_tail = skb_tail_pointer(skb); 208 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq, 209 unlh->nlmsg_type, sizeof(*r)); 210 211 r = NLMSG_DATA(nlh); 212 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 213 214 nlh->nlmsg_flags = nlmsg_flags; 215 216 tmo = tw->tw_ttd - jiffies; 217 if (tmo < 0) 218 tmo = 0; 219 220 r->idiag_family = tw->tw_family; 221 r->idiag_retrans = 0; 222 r->id.idiag_if = tw->tw_bound_dev_if; 223 sock_diag_save_cookie(tw, r->id.idiag_cookie); 224 r->id.idiag_sport = tw->tw_sport; 225 r->id.idiag_dport = tw->tw_dport; 226 r->id.idiag_src[0] = tw->tw_rcv_saddr; 227 r->id.idiag_dst[0] = tw->tw_daddr; 228 r->idiag_state = tw->tw_substate; 229 r->idiag_timer = 3; 230 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); 231 r->idiag_rqueue = 0; 232 r->idiag_wqueue = 0; 233 r->idiag_uid = 0; 234 r->idiag_inode = 0; 235 #if IS_ENABLED(CONFIG_IPV6) 236 if (tw->tw_family == AF_INET6) { 237 const struct inet6_timewait_sock *tw6 = 238 inet6_twsk((struct sock *)tw); 239 240 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr; 241 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr; 242 } 243 #endif 244 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; 245 return skb->len; 246 nlmsg_failure: 247 nlmsg_trim(skb, previous_tail); 248 return -EMSGSIZE; 249 } 250 251 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 252 struct inet_diag_req *r, u32 pid, u32 seq, u16 nlmsg_flags, 253 const struct nlmsghdr *unlh) 254 { 255 if (sk->sk_state == TCP_TIME_WAIT) 256 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 257 skb, r, pid, seq, nlmsg_flags, 258 unlh); 259 return inet_csk_diag_fill(sk, skb, r, pid, seq, nlmsg_flags, unlh); 260 } 261 262 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb, 263 const struct nlmsghdr *nlh, struct inet_diag_req *req) 264 { 265 int err; 266 struct sock *sk; 267 struct sk_buff *rep; 268 269 err = -EINVAL; 270 if (req->sdiag_family == AF_INET) { 271 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], 272 req->id.idiag_dport, req->id.idiag_src[0], 273 req->id.idiag_sport, req->id.idiag_if); 274 } 275 #if IS_ENABLED(CONFIG_IPV6) 276 else if (req->sdiag_family == AF_INET6) { 277 sk = inet6_lookup(&init_net, hashinfo, 278 (struct in6_addr *)req->id.idiag_dst, 279 req->id.idiag_dport, 280 (struct in6_addr *)req->id.idiag_src, 281 req->id.idiag_sport, 282 req->id.idiag_if); 283 } 284 #endif 285 else { 286 goto out_nosk; 287 } 288 289 err = -ENOENT; 290 if (sk == NULL) 291 goto out_nosk; 292 293 err = sock_diag_check_cookie(sk, req->id.idiag_cookie); 294 if (err) 295 goto out; 296 297 err = -ENOMEM; 298 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 299 sizeof(struct inet_diag_meminfo) + 300 sizeof(struct tcp_info) + 64)), 301 GFP_KERNEL); 302 if (!rep) 303 goto out; 304 305 err = sk_diag_fill(sk, rep, req, 306 NETLINK_CB(in_skb).pid, 307 nlh->nlmsg_seq, 0, nlh); 308 if (err < 0) { 309 WARN_ON(err == -EMSGSIZE); 310 kfree_skb(rep); 311 goto out; 312 } 313 err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid, 314 MSG_DONTWAIT); 315 if (err > 0) 316 err = 0; 317 318 out: 319 if (sk) { 320 if (sk->sk_state == TCP_TIME_WAIT) 321 inet_twsk_put((struct inet_timewait_sock *)sk); 322 else 323 sock_put(sk); 324 } 325 out_nosk: 326 return err; 327 } 328 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk); 329 330 static int inet_diag_get_exact(struct sk_buff *in_skb, 331 const struct nlmsghdr *nlh, 332 struct inet_diag_req *req) 333 { 334 const struct inet_diag_handler *handler; 335 int err; 336 337 handler = inet_diag_lock_handler(req->sdiag_protocol); 338 if (IS_ERR(handler)) 339 err = PTR_ERR(handler); 340 else 341 err = handler->dump_one(in_skb, nlh, req); 342 inet_diag_unlock_handler(handler); 343 344 return err; 345 } 346 347 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 348 { 349 int words = bits >> 5; 350 351 bits &= 0x1f; 352 353 if (words) { 354 if (memcmp(a1, a2, words << 2)) 355 return 0; 356 } 357 if (bits) { 358 __be32 w1, w2; 359 __be32 mask; 360 361 w1 = a1[words]; 362 w2 = a2[words]; 363 364 mask = htonl((0xffffffff) << (32 - bits)); 365 366 if ((w1 ^ w2) & mask) 367 return 0; 368 } 369 370 return 1; 371 } 372 373 374 static int inet_diag_bc_run(const struct nlattr *_bc, 375 const struct inet_diag_entry *entry) 376 { 377 const void *bc = nla_data(_bc); 378 int len = nla_len(_bc); 379 380 while (len > 0) { 381 int yes = 1; 382 const struct inet_diag_bc_op *op = bc; 383 384 switch (op->code) { 385 case INET_DIAG_BC_NOP: 386 break; 387 case INET_DIAG_BC_JMP: 388 yes = 0; 389 break; 390 case INET_DIAG_BC_S_GE: 391 yes = entry->sport >= op[1].no; 392 break; 393 case INET_DIAG_BC_S_LE: 394 yes = entry->sport <= op[1].no; 395 break; 396 case INET_DIAG_BC_D_GE: 397 yes = entry->dport >= op[1].no; 398 break; 399 case INET_DIAG_BC_D_LE: 400 yes = entry->dport <= op[1].no; 401 break; 402 case INET_DIAG_BC_AUTO: 403 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 404 break; 405 case INET_DIAG_BC_S_COND: 406 case INET_DIAG_BC_D_COND: { 407 struct inet_diag_hostcond *cond; 408 __be32 *addr; 409 410 cond = (struct inet_diag_hostcond *)(op + 1); 411 if (cond->port != -1 && 412 cond->port != (op->code == INET_DIAG_BC_S_COND ? 413 entry->sport : entry->dport)) { 414 yes = 0; 415 break; 416 } 417 418 if (cond->prefix_len == 0) 419 break; 420 421 if (op->code == INET_DIAG_BC_S_COND) 422 addr = entry->saddr; 423 else 424 addr = entry->daddr; 425 426 if (bitstring_match(addr, cond->addr, 427 cond->prefix_len)) 428 break; 429 if (entry->family == AF_INET6 && 430 cond->family == AF_INET) { 431 if (addr[0] == 0 && addr[1] == 0 && 432 addr[2] == htonl(0xffff) && 433 bitstring_match(addr + 3, cond->addr, 434 cond->prefix_len)) 435 break; 436 } 437 yes = 0; 438 break; 439 } 440 } 441 442 if (yes) { 443 len -= op->yes; 444 bc += op->yes; 445 } else { 446 len -= op->no; 447 bc += op->no; 448 } 449 } 450 return len == 0; 451 } 452 453 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) 454 { 455 struct inet_diag_entry entry; 456 struct inet_sock *inet = inet_sk(sk); 457 458 if (bc == NULL) 459 return 1; 460 461 entry.family = sk->sk_family; 462 #if IS_ENABLED(CONFIG_IPV6) 463 if (entry.family == AF_INET6) { 464 struct ipv6_pinfo *np = inet6_sk(sk); 465 466 entry.saddr = np->rcv_saddr.s6_addr32; 467 entry.daddr = np->daddr.s6_addr32; 468 } else 469 #endif 470 { 471 entry.saddr = &inet->inet_rcv_saddr; 472 entry.daddr = &inet->inet_daddr; 473 } 474 entry.sport = inet->inet_num; 475 entry.dport = ntohs(inet->inet_dport); 476 entry.userlocks = sk->sk_userlocks; 477 478 return inet_diag_bc_run(bc, &entry); 479 } 480 EXPORT_SYMBOL_GPL(inet_diag_bc_sk); 481 482 static int valid_cc(const void *bc, int len, int cc) 483 { 484 while (len >= 0) { 485 const struct inet_diag_bc_op *op = bc; 486 487 if (cc > len) 488 return 0; 489 if (cc == len) 490 return 1; 491 if (op->yes < 4 || op->yes & 3) 492 return 0; 493 len -= op->yes; 494 bc += op->yes; 495 } 496 return 0; 497 } 498 499 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 500 { 501 const void *bc = bytecode; 502 int len = bytecode_len; 503 504 while (len > 0) { 505 const struct inet_diag_bc_op *op = bc; 506 507 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 508 switch (op->code) { 509 case INET_DIAG_BC_AUTO: 510 case INET_DIAG_BC_S_COND: 511 case INET_DIAG_BC_D_COND: 512 case INET_DIAG_BC_S_GE: 513 case INET_DIAG_BC_S_LE: 514 case INET_DIAG_BC_D_GE: 515 case INET_DIAG_BC_D_LE: 516 case INET_DIAG_BC_JMP: 517 if (op->no < 4 || op->no > len + 4 || op->no & 3) 518 return -EINVAL; 519 if (op->no < len && 520 !valid_cc(bytecode, bytecode_len, len - op->no)) 521 return -EINVAL; 522 break; 523 case INET_DIAG_BC_NOP: 524 break; 525 default: 526 return -EINVAL; 527 } 528 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3) 529 return -EINVAL; 530 bc += op->yes; 531 len -= op->yes; 532 } 533 return len == 0 ? 0 : -EINVAL; 534 } 535 536 static int inet_csk_diag_dump(struct sock *sk, 537 struct sk_buff *skb, 538 struct netlink_callback *cb, 539 struct inet_diag_req *r, 540 const struct nlattr *bc) 541 { 542 if (!inet_diag_bc_sk(bc, sk)) 543 return 0; 544 545 return inet_csk_diag_fill(sk, skb, r, 546 NETLINK_CB(cb->skb).pid, 547 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 548 } 549 550 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 551 struct sk_buff *skb, 552 struct netlink_callback *cb, 553 struct inet_diag_req *r, 554 const struct nlattr *bc) 555 { 556 if (bc != NULL) { 557 struct inet_diag_entry entry; 558 559 entry.family = tw->tw_family; 560 #if IS_ENABLED(CONFIG_IPV6) 561 if (tw->tw_family == AF_INET6) { 562 struct inet6_timewait_sock *tw6 = 563 inet6_twsk((struct sock *)tw); 564 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 565 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 566 } else 567 #endif 568 { 569 entry.saddr = &tw->tw_rcv_saddr; 570 entry.daddr = &tw->tw_daddr; 571 } 572 entry.sport = tw->tw_num; 573 entry.dport = ntohs(tw->tw_dport); 574 entry.userlocks = 0; 575 576 if (!inet_diag_bc_run(bc, &entry)) 577 return 0; 578 } 579 580 return inet_twsk_diag_fill(tw, skb, r, 581 NETLINK_CB(cb->skb).pid, 582 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 583 } 584 585 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 586 struct request_sock *req, u32 pid, u32 seq, 587 const struct nlmsghdr *unlh) 588 { 589 const struct inet_request_sock *ireq = inet_rsk(req); 590 struct inet_sock *inet = inet_sk(sk); 591 unsigned char *b = skb_tail_pointer(skb); 592 struct inet_diag_msg *r; 593 struct nlmsghdr *nlh; 594 long tmo; 595 596 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 597 nlh->nlmsg_flags = NLM_F_MULTI; 598 r = NLMSG_DATA(nlh); 599 600 r->idiag_family = sk->sk_family; 601 r->idiag_state = TCP_SYN_RECV; 602 r->idiag_timer = 1; 603 r->idiag_retrans = req->retrans; 604 605 r->id.idiag_if = sk->sk_bound_dev_if; 606 sock_diag_save_cookie(req, r->id.idiag_cookie); 607 608 tmo = req->expires - jiffies; 609 if (tmo < 0) 610 tmo = 0; 611 612 r->id.idiag_sport = inet->inet_sport; 613 r->id.idiag_dport = ireq->rmt_port; 614 r->id.idiag_src[0] = ireq->loc_addr; 615 r->id.idiag_dst[0] = ireq->rmt_addr; 616 r->idiag_expires = jiffies_to_msecs(tmo); 617 r->idiag_rqueue = 0; 618 r->idiag_wqueue = 0; 619 r->idiag_uid = sock_i_uid(sk); 620 r->idiag_inode = 0; 621 #if IS_ENABLED(CONFIG_IPV6) 622 if (r->idiag_family == AF_INET6) { 623 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr; 624 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr; 625 } 626 #endif 627 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 628 629 return skb->len; 630 631 nlmsg_failure: 632 nlmsg_trim(skb, b); 633 return -1; 634 } 635 636 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 637 struct netlink_callback *cb, 638 struct inet_diag_req *r, 639 const struct nlattr *bc) 640 { 641 struct inet_diag_entry entry; 642 struct inet_connection_sock *icsk = inet_csk(sk); 643 struct listen_sock *lopt; 644 struct inet_sock *inet = inet_sk(sk); 645 int j, s_j; 646 int reqnum, s_reqnum; 647 int err = 0; 648 649 s_j = cb->args[3]; 650 s_reqnum = cb->args[4]; 651 652 if (s_j > 0) 653 s_j--; 654 655 entry.family = sk->sk_family; 656 657 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 658 659 lopt = icsk->icsk_accept_queue.listen_opt; 660 if (!lopt || !lopt->qlen) 661 goto out; 662 663 if (bc != NULL) { 664 entry.sport = inet->inet_num; 665 entry.userlocks = sk->sk_userlocks; 666 } 667 668 for (j = s_j; j < lopt->nr_table_entries; j++) { 669 struct request_sock *req, *head = lopt->syn_table[j]; 670 671 reqnum = 0; 672 for (req = head; req; reqnum++, req = req->dl_next) { 673 struct inet_request_sock *ireq = inet_rsk(req); 674 675 if (reqnum < s_reqnum) 676 continue; 677 if (r->id.idiag_dport != ireq->rmt_port && 678 r->id.idiag_dport) 679 continue; 680 681 if (bc) { 682 entry.saddr = 683 #if IS_ENABLED(CONFIG_IPV6) 684 (entry.family == AF_INET6) ? 685 inet6_rsk(req)->loc_addr.s6_addr32 : 686 #endif 687 &ireq->loc_addr; 688 entry.daddr = 689 #if IS_ENABLED(CONFIG_IPV6) 690 (entry.family == AF_INET6) ? 691 inet6_rsk(req)->rmt_addr.s6_addr32 : 692 #endif 693 &ireq->rmt_addr; 694 entry.dport = ntohs(ireq->rmt_port); 695 696 if (!inet_diag_bc_run(bc, &entry)) 697 continue; 698 } 699 700 err = inet_diag_fill_req(skb, sk, req, 701 NETLINK_CB(cb->skb).pid, 702 cb->nlh->nlmsg_seq, cb->nlh); 703 if (err < 0) { 704 cb->args[3] = j + 1; 705 cb->args[4] = reqnum; 706 goto out; 707 } 708 } 709 710 s_reqnum = 0; 711 } 712 713 out: 714 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 715 716 return err; 717 } 718 719 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, 720 struct netlink_callback *cb, struct inet_diag_req *r, struct nlattr *bc) 721 { 722 int i, num; 723 int s_i, s_num; 724 725 s_i = cb->args[1]; 726 s_num = num = cb->args[2]; 727 728 if (cb->args[0] == 0) { 729 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 730 goto skip_listen_ht; 731 732 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 733 struct sock *sk; 734 struct hlist_nulls_node *node; 735 struct inet_listen_hashbucket *ilb; 736 737 num = 0; 738 ilb = &hashinfo->listening_hash[i]; 739 spin_lock_bh(&ilb->lock); 740 sk_nulls_for_each(sk, node, &ilb->head) { 741 struct inet_sock *inet = inet_sk(sk); 742 743 if (num < s_num) { 744 num++; 745 continue; 746 } 747 748 if (r->sdiag_family != AF_UNSPEC && 749 sk->sk_family != r->sdiag_family) 750 goto next_listen; 751 752 if (r->id.idiag_sport != inet->inet_sport && 753 r->id.idiag_sport) 754 goto next_listen; 755 756 if (!(r->idiag_states & TCPF_LISTEN) || 757 r->id.idiag_dport || 758 cb->args[3] > 0) 759 goto syn_recv; 760 761 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 762 spin_unlock_bh(&ilb->lock); 763 goto done; 764 } 765 766 syn_recv: 767 if (!(r->idiag_states & TCPF_SYN_RECV)) 768 goto next_listen; 769 770 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) { 771 spin_unlock_bh(&ilb->lock); 772 goto done; 773 } 774 775 next_listen: 776 cb->args[3] = 0; 777 cb->args[4] = 0; 778 ++num; 779 } 780 spin_unlock_bh(&ilb->lock); 781 782 s_num = 0; 783 cb->args[3] = 0; 784 cb->args[4] = 0; 785 } 786 skip_listen_ht: 787 cb->args[0] = 1; 788 s_i = num = s_num = 0; 789 } 790 791 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 792 goto out; 793 794 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 795 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 796 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 797 struct sock *sk; 798 struct hlist_nulls_node *node; 799 800 num = 0; 801 802 if (hlist_nulls_empty(&head->chain) && 803 hlist_nulls_empty(&head->twchain)) 804 continue; 805 806 if (i > s_i) 807 s_num = 0; 808 809 spin_lock_bh(lock); 810 sk_nulls_for_each(sk, node, &head->chain) { 811 struct inet_sock *inet = inet_sk(sk); 812 813 if (num < s_num) 814 goto next_normal; 815 if (!(r->idiag_states & (1 << sk->sk_state))) 816 goto next_normal; 817 if (r->sdiag_family != AF_UNSPEC && 818 sk->sk_family != r->sdiag_family) 819 goto next_normal; 820 if (r->id.idiag_sport != inet->inet_sport && 821 r->id.idiag_sport) 822 goto next_normal; 823 if (r->id.idiag_dport != inet->inet_dport && 824 r->id.idiag_dport) 825 goto next_normal; 826 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 827 spin_unlock_bh(lock); 828 goto done; 829 } 830 next_normal: 831 ++num; 832 } 833 834 if (r->idiag_states & TCPF_TIME_WAIT) { 835 struct inet_timewait_sock *tw; 836 837 inet_twsk_for_each(tw, node, 838 &head->twchain) { 839 840 if (num < s_num) 841 goto next_dying; 842 if (r->sdiag_family != AF_UNSPEC && 843 tw->tw_family != r->sdiag_family) 844 goto next_dying; 845 if (r->id.idiag_sport != tw->tw_sport && 846 r->id.idiag_sport) 847 goto next_dying; 848 if (r->id.idiag_dport != tw->tw_dport && 849 r->id.idiag_dport) 850 goto next_dying; 851 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) { 852 spin_unlock_bh(lock); 853 goto done; 854 } 855 next_dying: 856 ++num; 857 } 858 } 859 spin_unlock_bh(lock); 860 } 861 862 done: 863 cb->args[1] = i; 864 cb->args[2] = num; 865 out: 866 ; 867 } 868 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk); 869 870 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 871 struct inet_diag_req *r, struct nlattr *bc) 872 { 873 const struct inet_diag_handler *handler; 874 875 handler = inet_diag_lock_handler(r->sdiag_protocol); 876 if (!IS_ERR(handler)) 877 handler->dump(skb, cb, r, bc); 878 inet_diag_unlock_handler(handler); 879 880 return skb->len; 881 } 882 883 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 884 { 885 struct nlattr *bc = NULL; 886 int hdrlen = sizeof(struct inet_diag_req); 887 888 if (nlmsg_attrlen(cb->nlh, hdrlen)) 889 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 890 891 return __inet_diag_dump(skb, cb, (struct inet_diag_req *)NLMSG_DATA(cb->nlh), bc); 892 } 893 894 static inline int inet_diag_type2proto(int type) 895 { 896 switch (type) { 897 case TCPDIAG_GETSOCK: 898 return IPPROTO_TCP; 899 case DCCPDIAG_GETSOCK: 900 return IPPROTO_DCCP; 901 default: 902 return 0; 903 } 904 } 905 906 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb) 907 { 908 struct inet_diag_req_compat *rc = NLMSG_DATA(cb->nlh); 909 struct inet_diag_req req; 910 struct nlattr *bc = NULL; 911 int hdrlen = sizeof(struct inet_diag_req_compat); 912 913 req.sdiag_family = AF_UNSPEC; /* compatibility */ 914 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 915 req.idiag_ext = rc->idiag_ext; 916 req.idiag_states = rc->idiag_states; 917 req.id = rc->id; 918 919 if (nlmsg_attrlen(cb->nlh, hdrlen)) 920 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 921 922 return __inet_diag_dump(skb, cb, &req, bc); 923 } 924 925 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 926 const struct nlmsghdr *nlh) 927 { 928 struct inet_diag_req_compat *rc = NLMSG_DATA(nlh); 929 struct inet_diag_req req; 930 931 req.sdiag_family = rc->idiag_family; 932 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 933 req.idiag_ext = rc->idiag_ext; 934 req.idiag_states = rc->idiag_states; 935 req.id = rc->id; 936 937 return inet_diag_get_exact(in_skb, nlh, &req); 938 } 939 940 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 941 { 942 int hdrlen = sizeof(struct inet_diag_req_compat); 943 944 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 945 nlmsg_len(nlh) < hdrlen) 946 return -EINVAL; 947 948 if (nlh->nlmsg_flags & NLM_F_DUMP) { 949 if (nlmsg_attrlen(nlh, hdrlen)) { 950 struct nlattr *attr; 951 952 attr = nlmsg_find_attr(nlh, hdrlen, 953 INET_DIAG_REQ_BYTECODE); 954 if (attr == NULL || 955 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 956 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 957 return -EINVAL; 958 } 959 960 return netlink_dump_start(sock_diag_nlsk, skb, nlh, 961 inet_diag_dump_compat, NULL, 0); 962 } 963 964 return inet_diag_get_exact_compat(skb, nlh); 965 } 966 967 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) 968 { 969 int hdrlen = sizeof(struct inet_diag_req); 970 971 if (nlmsg_len(h) < hdrlen) 972 return -EINVAL; 973 974 if (h->nlmsg_flags & NLM_F_DUMP) { 975 if (nlmsg_attrlen(h, hdrlen)) { 976 struct nlattr *attr; 977 attr = nlmsg_find_attr(h, hdrlen, 978 INET_DIAG_REQ_BYTECODE); 979 if (attr == NULL || 980 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 981 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 982 return -EINVAL; 983 } 984 985 return netlink_dump_start(sock_diag_nlsk, skb, h, 986 inet_diag_dump, NULL, 0); 987 } 988 989 return inet_diag_get_exact(skb, h, (struct inet_diag_req *)NLMSG_DATA(h)); 990 } 991 992 static struct sock_diag_handler inet_diag_handler = { 993 .family = AF_INET, 994 .dump = inet_diag_handler_dump, 995 }; 996 997 static struct sock_diag_handler inet6_diag_handler = { 998 .family = AF_INET6, 999 .dump = inet_diag_handler_dump, 1000 }; 1001 1002 int inet_diag_register(const struct inet_diag_handler *h) 1003 { 1004 const __u16 type = h->idiag_type; 1005 int err = -EINVAL; 1006 1007 if (type >= IPPROTO_MAX) 1008 goto out; 1009 1010 mutex_lock(&inet_diag_table_mutex); 1011 err = -EEXIST; 1012 if (inet_diag_table[type] == NULL) { 1013 inet_diag_table[type] = h; 1014 err = 0; 1015 } 1016 mutex_unlock(&inet_diag_table_mutex); 1017 out: 1018 return err; 1019 } 1020 EXPORT_SYMBOL_GPL(inet_diag_register); 1021 1022 void inet_diag_unregister(const struct inet_diag_handler *h) 1023 { 1024 const __u16 type = h->idiag_type; 1025 1026 if (type >= IPPROTO_MAX) 1027 return; 1028 1029 mutex_lock(&inet_diag_table_mutex); 1030 inet_diag_table[type] = NULL; 1031 mutex_unlock(&inet_diag_table_mutex); 1032 } 1033 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1034 1035 static int __init inet_diag_init(void) 1036 { 1037 const int inet_diag_table_size = (IPPROTO_MAX * 1038 sizeof(struct inet_diag_handler *)); 1039 int err = -ENOMEM; 1040 1041 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1042 if (!inet_diag_table) 1043 goto out; 1044 1045 err = sock_diag_register(&inet_diag_handler); 1046 if (err) 1047 goto out_free_nl; 1048 1049 err = sock_diag_register(&inet6_diag_handler); 1050 if (err) 1051 goto out_free_inet; 1052 1053 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1054 out: 1055 return err; 1056 1057 out_free_inet: 1058 sock_diag_unregister(&inet_diag_handler); 1059 out_free_nl: 1060 kfree(inet_diag_table); 1061 goto out; 1062 } 1063 1064 static void __exit inet_diag_exit(void) 1065 { 1066 sock_diag_unregister(&inet6_diag_handler); 1067 sock_diag_unregister(&inet_diag_handler); 1068 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1069 kfree(inet_diag_table); 1070 } 1071 1072 module_init(inet_diag_init); 1073 module_exit(inet_diag_exit); 1074 MODULE_LICENSE("GPL"); 1075 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */); 1076 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */); 1077