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", PF_NETLINK, 58 NETLINK_SOCK_DIAG, 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 static int inet_csk_diag_fill(struct sock *sk, 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 const struct inet_connection_sock *icsk = inet_csk(sk); 80 struct inet_diag_msg *r; 81 struct nlmsghdr *nlh; 82 void *info = NULL; 83 struct inet_diag_meminfo *minfo = NULL; 84 unsigned char *b = skb_tail_pointer(skb); 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, pid, seq, unlh->nlmsg_type, sizeof(*r)); 92 nlh->nlmsg_flags = nlmsg_flags; 93 94 r = NLMSG_DATA(nlh); 95 BUG_ON(sk->sk_state == TCP_TIME_WAIT); 96 97 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) 98 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo)); 99 100 if (ext & (1 << (INET_DIAG_INFO - 1))) 101 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, sizeof(struct tcp_info)); 102 103 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { 104 const size_t len = strlen(icsk->icsk_ca_ops->name); 105 106 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), 107 icsk->icsk_ca_ops->name); 108 } 109 110 r->idiag_family = sk->sk_family; 111 r->idiag_state = sk->sk_state; 112 r->idiag_timer = 0; 113 r->idiag_retrans = 0; 114 115 r->id.idiag_if = sk->sk_bound_dev_if; 116 r->id.idiag_cookie[0] = (u32)(unsigned long)sk; 117 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); 118 119 r->id.idiag_sport = inet->inet_sport; 120 r->id.idiag_dport = inet->inet_dport; 121 r->id.idiag_src[0] = inet->inet_rcv_saddr; 122 r->id.idiag_dst[0] = inet->inet_daddr; 123 124 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, 125 * hence this needs to be included regardless of socket family. 126 */ 127 if (ext & (1 << (INET_DIAG_TOS - 1))) 128 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos); 129 130 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 131 if (r->idiag_family == AF_INET6) { 132 const struct ipv6_pinfo *np = inet6_sk(sk); 133 134 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr; 135 *(struct in6_addr *)r->id.idiag_dst = np->daddr; 136 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 137 RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass); 138 } 139 #endif 140 141 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) 142 143 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 144 r->idiag_timer = 1; 145 r->idiag_retrans = icsk->icsk_retransmits; 146 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 147 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 148 r->idiag_timer = 4; 149 r->idiag_retrans = icsk->icsk_probes_out; 150 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 151 } else if (timer_pending(&sk->sk_timer)) { 152 r->idiag_timer = 2; 153 r->idiag_retrans = icsk->icsk_probes_out; 154 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 155 } else { 156 r->idiag_timer = 0; 157 r->idiag_expires = 0; 158 } 159 #undef EXPIRES_IN_MS 160 161 r->idiag_uid = sock_i_uid(sk); 162 r->idiag_inode = sock_i_ino(sk); 163 164 if (minfo) { 165 minfo->idiag_rmem = sk_rmem_alloc_get(sk); 166 minfo->idiag_wmem = sk->sk_wmem_queued; 167 minfo->idiag_fmem = sk->sk_forward_alloc; 168 minfo->idiag_tmem = sk_wmem_alloc_get(sk); 169 } 170 171 handler->idiag_get_info(sk, r, info); 172 173 if (sk->sk_state < TCP_TIME_WAIT && 174 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 175 icsk->icsk_ca_ops->get_info(sk, ext, skb); 176 177 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 178 return skb->len; 179 180 rtattr_failure: 181 nlmsg_failure: 182 nlmsg_trim(skb, b); 183 return -EMSGSIZE; 184 } 185 186 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 187 struct sk_buff *skb, struct inet_diag_req *req, 188 u32 pid, u32 seq, u16 nlmsg_flags, 189 const struct nlmsghdr *unlh) 190 { 191 long tmo; 192 struct inet_diag_msg *r; 193 const unsigned char *previous_tail = skb_tail_pointer(skb); 194 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq, 195 unlh->nlmsg_type, sizeof(*r)); 196 197 r = NLMSG_DATA(nlh); 198 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 199 200 nlh->nlmsg_flags = nlmsg_flags; 201 202 tmo = tw->tw_ttd - jiffies; 203 if (tmo < 0) 204 tmo = 0; 205 206 r->idiag_family = tw->tw_family; 207 r->idiag_retrans = 0; 208 r->id.idiag_if = tw->tw_bound_dev_if; 209 r->id.idiag_cookie[0] = (u32)(unsigned long)tw; 210 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1); 211 r->id.idiag_sport = tw->tw_sport; 212 r->id.idiag_dport = tw->tw_dport; 213 r->id.idiag_src[0] = tw->tw_rcv_saddr; 214 r->id.idiag_dst[0] = tw->tw_daddr; 215 r->idiag_state = tw->tw_substate; 216 r->idiag_timer = 3; 217 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); 218 r->idiag_rqueue = 0; 219 r->idiag_wqueue = 0; 220 r->idiag_uid = 0; 221 r->idiag_inode = 0; 222 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 223 if (tw->tw_family == AF_INET6) { 224 const struct inet6_timewait_sock *tw6 = 225 inet6_twsk((struct sock *)tw); 226 227 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr; 228 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr; 229 } 230 #endif 231 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; 232 return skb->len; 233 nlmsg_failure: 234 nlmsg_trim(skb, previous_tail); 235 return -EMSGSIZE; 236 } 237 238 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 239 struct inet_diag_req *r, u32 pid, u32 seq, u16 nlmsg_flags, 240 const struct nlmsghdr *unlh) 241 { 242 if (sk->sk_state == TCP_TIME_WAIT) 243 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 244 skb, r, pid, seq, nlmsg_flags, 245 unlh); 246 return inet_csk_diag_fill(sk, skb, r, pid, seq, nlmsg_flags, unlh); 247 } 248 249 static int inet_diag_get_exact(struct sk_buff *in_skb, 250 const struct nlmsghdr *nlh, 251 struct inet_diag_req *req) 252 { 253 int err; 254 struct sock *sk; 255 struct sk_buff *rep; 256 struct inet_hashinfo *hashinfo; 257 const struct inet_diag_handler *handler; 258 259 handler = inet_diag_lock_handler(req->sdiag_protocol); 260 if (IS_ERR(handler)) { 261 err = PTR_ERR(handler); 262 goto unlock; 263 } 264 265 hashinfo = handler->idiag_hashinfo; 266 err = -EINVAL; 267 268 if (req->sdiag_family == AF_INET) { 269 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], 270 req->id.idiag_dport, req->id.idiag_src[0], 271 req->id.idiag_sport, req->id.idiag_if); 272 } 273 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 274 else if (req->sdiag_family == AF_INET6) { 275 sk = inet6_lookup(&init_net, hashinfo, 276 (struct in6_addr *)req->id.idiag_dst, 277 req->id.idiag_dport, 278 (struct in6_addr *)req->id.idiag_src, 279 req->id.idiag_sport, 280 req->id.idiag_if); 281 } 282 #endif 283 else { 284 goto unlock; 285 } 286 287 err = -ENOENT; 288 if (sk == NULL) 289 goto unlock; 290 291 err = -ESTALE; 292 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || 293 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && 294 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || 295 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) 296 goto out; 297 298 err = -ENOMEM; 299 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 300 sizeof(struct inet_diag_meminfo) + 301 sizeof(struct tcp_info) + 64)), 302 GFP_KERNEL); 303 if (!rep) 304 goto out; 305 306 err = sk_diag_fill(sk, rep, req, 307 NETLINK_CB(in_skb).pid, 308 nlh->nlmsg_seq, 0, nlh); 309 if (err < 0) { 310 WARN_ON(err == -EMSGSIZE); 311 kfree_skb(rep); 312 goto out; 313 } 314 err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid, 315 MSG_DONTWAIT); 316 if (err > 0) 317 err = 0; 318 319 out: 320 if (sk) { 321 if (sk->sk_state == TCP_TIME_WAIT) 322 inet_twsk_put((struct inet_timewait_sock *)sk); 323 else 324 sock_put(sk); 325 } 326 unlock: 327 inet_diag_unlock_handler(handler); 328 return err; 329 } 330 331 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 332 { 333 int words = bits >> 5; 334 335 bits &= 0x1f; 336 337 if (words) { 338 if (memcmp(a1, a2, words << 2)) 339 return 0; 340 } 341 if (bits) { 342 __be32 w1, w2; 343 __be32 mask; 344 345 w1 = a1[words]; 346 w2 = a2[words]; 347 348 mask = htonl((0xffffffff) << (32 - bits)); 349 350 if ((w1 ^ w2) & mask) 351 return 0; 352 } 353 354 return 1; 355 } 356 357 358 static int inet_diag_bc_run(const struct nlattr *_bc, 359 const struct inet_diag_entry *entry) 360 { 361 const void *bc = nla_data(_bc); 362 int len = nla_len(_bc); 363 364 while (len > 0) { 365 int yes = 1; 366 const struct inet_diag_bc_op *op = bc; 367 368 switch (op->code) { 369 case INET_DIAG_BC_NOP: 370 break; 371 case INET_DIAG_BC_JMP: 372 yes = 0; 373 break; 374 case INET_DIAG_BC_S_GE: 375 yes = entry->sport >= op[1].no; 376 break; 377 case INET_DIAG_BC_S_LE: 378 yes = entry->sport <= op[1].no; 379 break; 380 case INET_DIAG_BC_D_GE: 381 yes = entry->dport >= op[1].no; 382 break; 383 case INET_DIAG_BC_D_LE: 384 yes = entry->dport <= op[1].no; 385 break; 386 case INET_DIAG_BC_AUTO: 387 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 388 break; 389 case INET_DIAG_BC_S_COND: 390 case INET_DIAG_BC_D_COND: { 391 struct inet_diag_hostcond *cond; 392 __be32 *addr; 393 394 cond = (struct inet_diag_hostcond *)(op + 1); 395 if (cond->port != -1 && 396 cond->port != (op->code == INET_DIAG_BC_S_COND ? 397 entry->sport : entry->dport)) { 398 yes = 0; 399 break; 400 } 401 402 if (cond->prefix_len == 0) 403 break; 404 405 if (op->code == INET_DIAG_BC_S_COND) 406 addr = entry->saddr; 407 else 408 addr = entry->daddr; 409 410 if (bitstring_match(addr, cond->addr, 411 cond->prefix_len)) 412 break; 413 if (entry->family == AF_INET6 && 414 cond->family == AF_INET) { 415 if (addr[0] == 0 && addr[1] == 0 && 416 addr[2] == htonl(0xffff) && 417 bitstring_match(addr + 3, cond->addr, 418 cond->prefix_len)) 419 break; 420 } 421 yes = 0; 422 break; 423 } 424 } 425 426 if (yes) { 427 len -= op->yes; 428 bc += op->yes; 429 } else { 430 len -= op->no; 431 bc += op->no; 432 } 433 } 434 return len == 0; 435 } 436 437 static int valid_cc(const void *bc, int len, int cc) 438 { 439 while (len >= 0) { 440 const struct inet_diag_bc_op *op = bc; 441 442 if (cc > len) 443 return 0; 444 if (cc == len) 445 return 1; 446 if (op->yes < 4 || op->yes & 3) 447 return 0; 448 len -= op->yes; 449 bc += op->yes; 450 } 451 return 0; 452 } 453 454 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 455 { 456 const void *bc = bytecode; 457 int len = bytecode_len; 458 459 while (len > 0) { 460 const struct inet_diag_bc_op *op = bc; 461 462 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 463 switch (op->code) { 464 case INET_DIAG_BC_AUTO: 465 case INET_DIAG_BC_S_COND: 466 case INET_DIAG_BC_D_COND: 467 case INET_DIAG_BC_S_GE: 468 case INET_DIAG_BC_S_LE: 469 case INET_DIAG_BC_D_GE: 470 case INET_DIAG_BC_D_LE: 471 case INET_DIAG_BC_JMP: 472 if (op->no < 4 || op->no > len + 4 || op->no & 3) 473 return -EINVAL; 474 if (op->no < len && 475 !valid_cc(bytecode, bytecode_len, len - op->no)) 476 return -EINVAL; 477 break; 478 case INET_DIAG_BC_NOP: 479 break; 480 default: 481 return -EINVAL; 482 } 483 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3) 484 return -EINVAL; 485 bc += op->yes; 486 len -= op->yes; 487 } 488 return len == 0 ? 0 : -EINVAL; 489 } 490 491 static int inet_csk_diag_dump(struct sock *sk, 492 struct sk_buff *skb, 493 struct netlink_callback *cb, 494 struct inet_diag_req *r, 495 const struct nlattr *bc) 496 { 497 if (bc != NULL) { 498 struct inet_diag_entry entry; 499 struct inet_sock *inet = inet_sk(sk); 500 501 entry.family = sk->sk_family; 502 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 503 if (entry.family == AF_INET6) { 504 struct ipv6_pinfo *np = inet6_sk(sk); 505 506 entry.saddr = np->rcv_saddr.s6_addr32; 507 entry.daddr = np->daddr.s6_addr32; 508 } else 509 #endif 510 { 511 entry.saddr = &inet->inet_rcv_saddr; 512 entry.daddr = &inet->inet_daddr; 513 } 514 entry.sport = inet->inet_num; 515 entry.dport = ntohs(inet->inet_dport); 516 entry.userlocks = sk->sk_userlocks; 517 518 if (!inet_diag_bc_run(bc, &entry)) 519 return 0; 520 } 521 522 return inet_csk_diag_fill(sk, skb, r, 523 NETLINK_CB(cb->skb).pid, 524 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 525 } 526 527 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 528 struct sk_buff *skb, 529 struct netlink_callback *cb, 530 struct inet_diag_req *r, 531 const struct nlattr *bc) 532 { 533 if (bc != NULL) { 534 struct inet_diag_entry entry; 535 536 entry.family = tw->tw_family; 537 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 538 if (tw->tw_family == AF_INET6) { 539 struct inet6_timewait_sock *tw6 = 540 inet6_twsk((struct sock *)tw); 541 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 542 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 543 } else 544 #endif 545 { 546 entry.saddr = &tw->tw_rcv_saddr; 547 entry.daddr = &tw->tw_daddr; 548 } 549 entry.sport = tw->tw_num; 550 entry.dport = ntohs(tw->tw_dport); 551 entry.userlocks = 0; 552 553 if (!inet_diag_bc_run(bc, &entry)) 554 return 0; 555 } 556 557 return inet_twsk_diag_fill(tw, skb, r, 558 NETLINK_CB(cb->skb).pid, 559 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 560 } 561 562 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 563 struct request_sock *req, u32 pid, u32 seq, 564 const struct nlmsghdr *unlh) 565 { 566 const struct inet_request_sock *ireq = inet_rsk(req); 567 struct inet_sock *inet = inet_sk(sk); 568 unsigned char *b = skb_tail_pointer(skb); 569 struct inet_diag_msg *r; 570 struct nlmsghdr *nlh; 571 long tmo; 572 573 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 574 nlh->nlmsg_flags = NLM_F_MULTI; 575 r = NLMSG_DATA(nlh); 576 577 r->idiag_family = sk->sk_family; 578 r->idiag_state = TCP_SYN_RECV; 579 r->idiag_timer = 1; 580 r->idiag_retrans = req->retrans; 581 582 r->id.idiag_if = sk->sk_bound_dev_if; 583 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 584 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 585 586 tmo = req->expires - jiffies; 587 if (tmo < 0) 588 tmo = 0; 589 590 r->id.idiag_sport = inet->inet_sport; 591 r->id.idiag_dport = ireq->rmt_port; 592 r->id.idiag_src[0] = ireq->loc_addr; 593 r->id.idiag_dst[0] = ireq->rmt_addr; 594 r->idiag_expires = jiffies_to_msecs(tmo); 595 r->idiag_rqueue = 0; 596 r->idiag_wqueue = 0; 597 r->idiag_uid = sock_i_uid(sk); 598 r->idiag_inode = 0; 599 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 600 if (r->idiag_family == AF_INET6) { 601 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr; 602 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr; 603 } 604 #endif 605 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 606 607 return skb->len; 608 609 nlmsg_failure: 610 nlmsg_trim(skb, b); 611 return -1; 612 } 613 614 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 615 struct netlink_callback *cb, 616 struct inet_diag_req *r, 617 const struct nlattr *bc) 618 { 619 struct inet_diag_entry entry; 620 struct inet_connection_sock *icsk = inet_csk(sk); 621 struct listen_sock *lopt; 622 struct inet_sock *inet = inet_sk(sk); 623 int j, s_j; 624 int reqnum, s_reqnum; 625 int err = 0; 626 627 s_j = cb->args[3]; 628 s_reqnum = cb->args[4]; 629 630 if (s_j > 0) 631 s_j--; 632 633 entry.family = sk->sk_family; 634 635 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 636 637 lopt = icsk->icsk_accept_queue.listen_opt; 638 if (!lopt || !lopt->qlen) 639 goto out; 640 641 if (bc != NULL) { 642 entry.sport = inet->inet_num; 643 entry.userlocks = sk->sk_userlocks; 644 } 645 646 for (j = s_j; j < lopt->nr_table_entries; j++) { 647 struct request_sock *req, *head = lopt->syn_table[j]; 648 649 reqnum = 0; 650 for (req = head; req; reqnum++, req = req->dl_next) { 651 struct inet_request_sock *ireq = inet_rsk(req); 652 653 if (reqnum < s_reqnum) 654 continue; 655 if (r->id.idiag_dport != ireq->rmt_port && 656 r->id.idiag_dport) 657 continue; 658 659 if (bc) { 660 entry.saddr = 661 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 662 (entry.family == AF_INET6) ? 663 inet6_rsk(req)->loc_addr.s6_addr32 : 664 #endif 665 &ireq->loc_addr; 666 entry.daddr = 667 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 668 (entry.family == AF_INET6) ? 669 inet6_rsk(req)->rmt_addr.s6_addr32 : 670 #endif 671 &ireq->rmt_addr; 672 entry.dport = ntohs(ireq->rmt_port); 673 674 if (!inet_diag_bc_run(bc, &entry)) 675 continue; 676 } 677 678 err = inet_diag_fill_req(skb, sk, req, 679 NETLINK_CB(cb->skb).pid, 680 cb->nlh->nlmsg_seq, cb->nlh); 681 if (err < 0) { 682 cb->args[3] = j + 1; 683 cb->args[4] = reqnum; 684 goto out; 685 } 686 } 687 688 s_reqnum = 0; 689 } 690 691 out: 692 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 693 694 return err; 695 } 696 697 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 698 struct inet_diag_req *r, struct nlattr *bc) 699 { 700 int i, num; 701 int s_i, s_num; 702 const struct inet_diag_handler *handler; 703 struct inet_hashinfo *hashinfo; 704 705 handler = inet_diag_lock_handler(r->sdiag_protocol); 706 if (IS_ERR(handler)) 707 goto unlock; 708 709 hashinfo = handler->idiag_hashinfo; 710 711 s_i = cb->args[1]; 712 s_num = num = cb->args[2]; 713 714 if (cb->args[0] == 0) { 715 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 716 goto skip_listen_ht; 717 718 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 719 struct sock *sk; 720 struct hlist_nulls_node *node; 721 struct inet_listen_hashbucket *ilb; 722 723 num = 0; 724 ilb = &hashinfo->listening_hash[i]; 725 spin_lock_bh(&ilb->lock); 726 sk_nulls_for_each(sk, node, &ilb->head) { 727 struct inet_sock *inet = inet_sk(sk); 728 729 if (num < s_num) { 730 num++; 731 continue; 732 } 733 734 if (r->sdiag_family != AF_UNSPEC && 735 sk->sk_family != r->sdiag_family) 736 goto next_listen; 737 738 if (r->id.idiag_sport != inet->inet_sport && 739 r->id.idiag_sport) 740 goto next_listen; 741 742 if (!(r->idiag_states & TCPF_LISTEN) || 743 r->id.idiag_dport || 744 cb->args[3] > 0) 745 goto syn_recv; 746 747 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 748 spin_unlock_bh(&ilb->lock); 749 goto done; 750 } 751 752 syn_recv: 753 if (!(r->idiag_states & TCPF_SYN_RECV)) 754 goto next_listen; 755 756 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) { 757 spin_unlock_bh(&ilb->lock); 758 goto done; 759 } 760 761 next_listen: 762 cb->args[3] = 0; 763 cb->args[4] = 0; 764 ++num; 765 } 766 spin_unlock_bh(&ilb->lock); 767 768 s_num = 0; 769 cb->args[3] = 0; 770 cb->args[4] = 0; 771 } 772 skip_listen_ht: 773 cb->args[0] = 1; 774 s_i = num = s_num = 0; 775 } 776 777 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 778 goto unlock; 779 780 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 781 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 782 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 783 struct sock *sk; 784 struct hlist_nulls_node *node; 785 786 num = 0; 787 788 if (hlist_nulls_empty(&head->chain) && 789 hlist_nulls_empty(&head->twchain)) 790 continue; 791 792 if (i > s_i) 793 s_num = 0; 794 795 spin_lock_bh(lock); 796 sk_nulls_for_each(sk, node, &head->chain) { 797 struct inet_sock *inet = inet_sk(sk); 798 799 if (num < s_num) 800 goto next_normal; 801 if (!(r->idiag_states & (1 << sk->sk_state))) 802 goto next_normal; 803 if (r->sdiag_family != AF_UNSPEC && 804 sk->sk_family != r->sdiag_family) 805 goto next_normal; 806 if (r->id.idiag_sport != inet->inet_sport && 807 r->id.idiag_sport) 808 goto next_normal; 809 if (r->id.idiag_dport != inet->inet_dport && 810 r->id.idiag_dport) 811 goto next_normal; 812 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 813 spin_unlock_bh(lock); 814 goto done; 815 } 816 next_normal: 817 ++num; 818 } 819 820 if (r->idiag_states & TCPF_TIME_WAIT) { 821 struct inet_timewait_sock *tw; 822 823 inet_twsk_for_each(tw, node, 824 &head->twchain) { 825 826 if (num < s_num) 827 goto next_dying; 828 if (r->sdiag_family != AF_UNSPEC && 829 tw->tw_family != r->sdiag_family) 830 goto next_dying; 831 if (r->id.idiag_sport != tw->tw_sport && 832 r->id.idiag_sport) 833 goto next_dying; 834 if (r->id.idiag_dport != tw->tw_dport && 835 r->id.idiag_dport) 836 goto next_dying; 837 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) { 838 spin_unlock_bh(lock); 839 goto done; 840 } 841 next_dying: 842 ++num; 843 } 844 } 845 spin_unlock_bh(lock); 846 } 847 848 done: 849 cb->args[1] = i; 850 cb->args[2] = num; 851 unlock: 852 inet_diag_unlock_handler(handler); 853 return skb->len; 854 } 855 856 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 857 { 858 struct nlattr *bc = NULL; 859 int hdrlen = sizeof(struct inet_diag_req); 860 861 if (nlmsg_attrlen(cb->nlh, hdrlen)) 862 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 863 864 return __inet_diag_dump(skb, cb, (struct inet_diag_req *)NLMSG_DATA(cb->nlh), bc); 865 } 866 867 static inline int inet_diag_type2proto(int type) 868 { 869 switch (type) { 870 case TCPDIAG_GETSOCK: 871 return IPPROTO_TCP; 872 case DCCPDIAG_GETSOCK: 873 return IPPROTO_DCCP; 874 default: 875 return 0; 876 } 877 } 878 879 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb) 880 { 881 struct inet_diag_req_compat *rc = NLMSG_DATA(cb->nlh); 882 struct inet_diag_req req; 883 struct nlattr *bc = NULL; 884 int hdrlen = sizeof(struct inet_diag_req_compat); 885 886 req.sdiag_family = AF_UNSPEC; /* compatibility */ 887 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 888 req.idiag_ext = rc->idiag_ext; 889 req.idiag_states = rc->idiag_states; 890 req.id = rc->id; 891 892 if (nlmsg_attrlen(cb->nlh, hdrlen)) 893 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 894 895 return __inet_diag_dump(skb, cb, &req, bc); 896 } 897 898 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 899 const struct nlmsghdr *nlh) 900 { 901 struct inet_diag_req_compat *rc = NLMSG_DATA(nlh); 902 struct inet_diag_req req; 903 904 req.sdiag_family = rc->idiag_family; 905 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 906 req.idiag_ext = rc->idiag_ext; 907 req.idiag_states = rc->idiag_states; 908 req.id = rc->id; 909 910 return inet_diag_get_exact(in_skb, nlh, &req); 911 } 912 913 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 914 { 915 int hdrlen = sizeof(struct inet_diag_req_compat); 916 917 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 918 nlmsg_len(nlh) < hdrlen) 919 return -EINVAL; 920 921 if (nlh->nlmsg_flags & NLM_F_DUMP) { 922 if (nlmsg_attrlen(nlh, hdrlen)) { 923 struct nlattr *attr; 924 925 attr = nlmsg_find_attr(nlh, hdrlen, 926 INET_DIAG_REQ_BYTECODE); 927 if (attr == NULL || 928 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 929 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 930 return -EINVAL; 931 } 932 933 return netlink_dump_start(sock_diag_nlsk, skb, nlh, 934 inet_diag_dump_compat, NULL, 0); 935 } 936 937 return inet_diag_get_exact_compat(skb, nlh); 938 } 939 940 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) 941 { 942 int hdrlen = sizeof(struct inet_diag_req); 943 944 if (nlmsg_len(h) < hdrlen) 945 return -EINVAL; 946 947 if (h->nlmsg_flags & NLM_F_DUMP) { 948 if (nlmsg_attrlen(h, hdrlen)) { 949 struct nlattr *attr; 950 attr = nlmsg_find_attr(h, hdrlen, 951 INET_DIAG_REQ_BYTECODE); 952 if (attr == NULL || 953 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 954 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 955 return -EINVAL; 956 } 957 958 return netlink_dump_start(sock_diag_nlsk, skb, h, 959 inet_diag_dump, NULL, 0); 960 } 961 962 return inet_diag_get_exact(skb, h, (struct inet_diag_req *)NLMSG_DATA(h)); 963 } 964 965 static struct sock_diag_handler inet_diag_handler = { 966 .family = AF_INET, 967 .dump = inet_diag_handler_dump, 968 }; 969 970 static struct sock_diag_handler inet6_diag_handler = { 971 .family = AF_INET6, 972 .dump = inet_diag_handler_dump, 973 }; 974 975 int inet_diag_register(const struct inet_diag_handler *h) 976 { 977 const __u16 type = h->idiag_type; 978 int err = -EINVAL; 979 980 if (type >= IPPROTO_MAX) 981 goto out; 982 983 mutex_lock(&inet_diag_table_mutex); 984 err = -EEXIST; 985 if (inet_diag_table[type] == NULL) { 986 inet_diag_table[type] = h; 987 err = 0; 988 } 989 mutex_unlock(&inet_diag_table_mutex); 990 out: 991 return err; 992 } 993 EXPORT_SYMBOL_GPL(inet_diag_register); 994 995 void inet_diag_unregister(const struct inet_diag_handler *h) 996 { 997 const __u16 type = h->idiag_type; 998 999 if (type >= IPPROTO_MAX) 1000 return; 1001 1002 mutex_lock(&inet_diag_table_mutex); 1003 inet_diag_table[type] = NULL; 1004 mutex_unlock(&inet_diag_table_mutex); 1005 } 1006 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1007 1008 static int __init inet_diag_init(void) 1009 { 1010 const int inet_diag_table_size = (IPPROTO_MAX * 1011 sizeof(struct inet_diag_handler *)); 1012 int err = -ENOMEM; 1013 1014 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1015 if (!inet_diag_table) 1016 goto out; 1017 1018 err = sock_diag_register(&inet_diag_handler); 1019 if (err) 1020 goto out_free_nl; 1021 1022 err = sock_diag_register(&inet6_diag_handler); 1023 if (err) 1024 goto out_free_inet; 1025 1026 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1027 out: 1028 return err; 1029 1030 out_free_inet: 1031 sock_diag_unregister(&inet_diag_handler); 1032 out_free_nl: 1033 kfree(inet_diag_table); 1034 goto out; 1035 } 1036 1037 static void __exit inet_diag_exit(void) 1038 { 1039 sock_diag_unregister(&inet6_diag_handler); 1040 sock_diag_unregister(&inet_diag_handler); 1041 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1042 kfree(inet_diag_table); 1043 } 1044 1045 module_init(inet_diag_init); 1046 module_exit(inet_diag_exit); 1047 MODULE_LICENSE("GPL"); 1048 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 0); 1049