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 37 static const struct inet_diag_handler **inet_diag_table; 38 39 struct inet_diag_entry { 40 __be32 *saddr; 41 __be32 *daddr; 42 u16 sport; 43 u16 dport; 44 u16 family; 45 u16 userlocks; 46 }; 47 48 static struct sock *idiagnl; 49 50 #define INET_DIAG_PUT(skb, attrtype, attrlen) \ 51 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) 52 53 static DEFINE_MUTEX(inet_diag_table_mutex); 54 55 static const struct inet_diag_handler *inet_diag_lock_handler(int type) 56 { 57 if (!inet_diag_table[type]) 58 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, 59 NETLINK_INET_DIAG, type); 60 61 mutex_lock(&inet_diag_table_mutex); 62 if (!inet_diag_table[type]) 63 return ERR_PTR(-ENOENT); 64 65 return inet_diag_table[type]; 66 } 67 68 static inline void inet_diag_unlock_handler( 69 const struct inet_diag_handler *handler) 70 { 71 mutex_unlock(&inet_diag_table_mutex); 72 } 73 74 static int inet_csk_diag_fill(struct sock *sk, 75 struct sk_buff *skb, 76 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 77 const struct nlmsghdr *unlh) 78 { 79 const struct inet_sock *inet = inet_sk(sk); 80 const struct inet_connection_sock *icsk = inet_csk(sk); 81 struct inet_diag_msg *r; 82 struct nlmsghdr *nlh; 83 void *info = NULL; 84 struct inet_diag_meminfo *minfo = NULL; 85 unsigned char *b = skb_tail_pointer(skb); 86 const struct inet_diag_handler *handler; 87 88 handler = inet_diag_table[unlh->nlmsg_type]; 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, 102 handler->idiag_info_size); 103 104 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { 105 const size_t len = strlen(icsk->icsk_ca_ops->name); 106 107 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), 108 icsk->icsk_ca_ops->name); 109 } 110 111 r->idiag_family = sk->sk_family; 112 r->idiag_state = sk->sk_state; 113 r->idiag_timer = 0; 114 r->idiag_retrans = 0; 115 116 r->id.idiag_if = sk->sk_bound_dev_if; 117 r->id.idiag_cookie[0] = (u32)(unsigned long)sk; 118 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); 119 120 r->id.idiag_sport = inet->inet_sport; 121 r->id.idiag_dport = inet->inet_dport; 122 r->id.idiag_src[0] = inet->inet_rcv_saddr; 123 r->id.idiag_dst[0] = inet->inet_daddr; 124 125 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, 126 * hence this needs to be included regardless of socket family. 127 */ 128 if (ext & (1 << (INET_DIAG_TOS - 1))) 129 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos); 130 131 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 132 if (r->idiag_family == AF_INET6) { 133 const struct ipv6_pinfo *np = inet6_sk(sk); 134 135 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 136 RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass); 137 138 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 139 &np->rcv_saddr); 140 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 141 &np->daddr); 142 } 143 #endif 144 145 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) 146 147 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 148 r->idiag_timer = 1; 149 r->idiag_retrans = icsk->icsk_retransmits; 150 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 151 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 152 r->idiag_timer = 4; 153 r->idiag_retrans = icsk->icsk_probes_out; 154 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 155 } else if (timer_pending(&sk->sk_timer)) { 156 r->idiag_timer = 2; 157 r->idiag_retrans = icsk->icsk_probes_out; 158 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 159 } else { 160 r->idiag_timer = 0; 161 r->idiag_expires = 0; 162 } 163 #undef EXPIRES_IN_MS 164 165 r->idiag_uid = sock_i_uid(sk); 166 r->idiag_inode = sock_i_ino(sk); 167 168 if (minfo) { 169 minfo->idiag_rmem = sk_rmem_alloc_get(sk); 170 minfo->idiag_wmem = sk->sk_wmem_queued; 171 minfo->idiag_fmem = sk->sk_forward_alloc; 172 minfo->idiag_tmem = sk_wmem_alloc_get(sk); 173 } 174 175 handler->idiag_get_info(sk, r, info); 176 177 if (sk->sk_state < TCP_TIME_WAIT && 178 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 179 icsk->icsk_ca_ops->get_info(sk, ext, skb); 180 181 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 } 189 190 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 191 struct sk_buff *skb, int ext, u32 pid, 192 u32 seq, u16 nlmsg_flags, 193 const struct nlmsghdr *unlh) 194 { 195 long tmo; 196 struct inet_diag_msg *r; 197 const unsigned char *previous_tail = skb_tail_pointer(skb); 198 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq, 199 unlh->nlmsg_type, sizeof(*r)); 200 201 r = NLMSG_DATA(nlh); 202 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 203 204 nlh->nlmsg_flags = nlmsg_flags; 205 206 tmo = tw->tw_ttd - jiffies; 207 if (tmo < 0) 208 tmo = 0; 209 210 r->idiag_family = tw->tw_family; 211 r->idiag_retrans = 0; 212 r->id.idiag_if = tw->tw_bound_dev_if; 213 r->id.idiag_cookie[0] = (u32)(unsigned long)tw; 214 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1); 215 r->id.idiag_sport = tw->tw_sport; 216 r->id.idiag_dport = tw->tw_dport; 217 r->id.idiag_src[0] = tw->tw_rcv_saddr; 218 r->id.idiag_dst[0] = tw->tw_daddr; 219 r->idiag_state = tw->tw_substate; 220 r->idiag_timer = 3; 221 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); 222 r->idiag_rqueue = 0; 223 r->idiag_wqueue = 0; 224 r->idiag_uid = 0; 225 r->idiag_inode = 0; 226 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 227 if (tw->tw_family == AF_INET6) { 228 const struct inet6_timewait_sock *tw6 = 229 inet6_twsk((struct sock *)tw); 230 231 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 232 &tw6->tw_v6_rcv_saddr); 233 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 234 &tw6->tw_v6_daddr); 235 } 236 #endif 237 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; 238 return skb->len; 239 nlmsg_failure: 240 nlmsg_trim(skb, previous_tail); 241 return -EMSGSIZE; 242 } 243 244 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 245 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 246 const struct nlmsghdr *unlh) 247 { 248 if (sk->sk_state == TCP_TIME_WAIT) 249 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 250 skb, ext, pid, seq, nlmsg_flags, 251 unlh); 252 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh); 253 } 254 255 static int inet_diag_get_exact(struct sk_buff *in_skb, 256 const struct nlmsghdr *nlh) 257 { 258 int err; 259 struct sock *sk; 260 struct inet_diag_req *req = NLMSG_DATA(nlh); 261 struct sk_buff *rep; 262 struct inet_hashinfo *hashinfo; 263 const struct inet_diag_handler *handler; 264 265 handler = inet_diag_lock_handler(nlh->nlmsg_type); 266 if (IS_ERR(handler)) { 267 err = PTR_ERR(handler); 268 goto unlock; 269 } 270 271 hashinfo = handler->idiag_hashinfo; 272 err = -EINVAL; 273 274 if (req->idiag_family == AF_INET) { 275 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], 276 req->id.idiag_dport, req->id.idiag_src[0], 277 req->id.idiag_sport, req->id.idiag_if); 278 } 279 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 280 else if (req->idiag_family == AF_INET6) { 281 sk = inet6_lookup(&init_net, hashinfo, 282 (struct in6_addr *)req->id.idiag_dst, 283 req->id.idiag_dport, 284 (struct in6_addr *)req->id.idiag_src, 285 req->id.idiag_sport, 286 req->id.idiag_if); 287 } 288 #endif 289 else { 290 goto unlock; 291 } 292 293 err = -ENOENT; 294 if (sk == NULL) 295 goto unlock; 296 297 err = -ESTALE; 298 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || 299 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && 300 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || 301 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) 302 goto out; 303 304 err = -ENOMEM; 305 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 306 sizeof(struct inet_diag_meminfo) + 307 handler->idiag_info_size + 64)), 308 GFP_KERNEL); 309 if (!rep) 310 goto out; 311 312 err = sk_diag_fill(sk, rep, req->idiag_ext, 313 NETLINK_CB(in_skb).pid, 314 nlh->nlmsg_seq, 0, nlh); 315 if (err < 0) { 316 WARN_ON(err == -EMSGSIZE); 317 kfree_skb(rep); 318 goto out; 319 } 320 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid, 321 MSG_DONTWAIT); 322 if (err > 0) 323 err = 0; 324 325 out: 326 if (sk) { 327 if (sk->sk_state == TCP_TIME_WAIT) 328 inet_twsk_put((struct inet_timewait_sock *)sk); 329 else 330 sock_put(sk); 331 } 332 unlock: 333 inet_diag_unlock_handler(handler); 334 return err; 335 } 336 337 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 338 { 339 int words = bits >> 5; 340 341 bits &= 0x1f; 342 343 if (words) { 344 if (memcmp(a1, a2, words << 2)) 345 return 0; 346 } 347 if (bits) { 348 __be32 w1, w2; 349 __be32 mask; 350 351 w1 = a1[words]; 352 w2 = a2[words]; 353 354 mask = htonl((0xffffffff) << (32 - bits)); 355 356 if ((w1 ^ w2) & mask) 357 return 0; 358 } 359 360 return 1; 361 } 362 363 364 static int inet_diag_bc_run(const void *bc, int len, 365 const struct inet_diag_entry *entry) 366 { 367 while (len > 0) { 368 int yes = 1; 369 const struct inet_diag_bc_op *op = bc; 370 371 switch (op->code) { 372 case INET_DIAG_BC_NOP: 373 break; 374 case INET_DIAG_BC_JMP: 375 yes = 0; 376 break; 377 case INET_DIAG_BC_S_GE: 378 yes = entry->sport >= op[1].no; 379 break; 380 case INET_DIAG_BC_S_LE: 381 yes = entry->sport <= op[1].no; 382 break; 383 case INET_DIAG_BC_D_GE: 384 yes = entry->dport >= op[1].no; 385 break; 386 case INET_DIAG_BC_D_LE: 387 yes = entry->dport <= op[1].no; 388 break; 389 case INET_DIAG_BC_AUTO: 390 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 391 break; 392 case INET_DIAG_BC_S_COND: 393 case INET_DIAG_BC_D_COND: { 394 struct inet_diag_hostcond *cond; 395 __be32 *addr; 396 397 cond = (struct inet_diag_hostcond *)(op + 1); 398 if (cond->port != -1 && 399 cond->port != (op->code == INET_DIAG_BC_S_COND ? 400 entry->sport : entry->dport)) { 401 yes = 0; 402 break; 403 } 404 405 if (cond->prefix_len == 0) 406 break; 407 408 if (op->code == INET_DIAG_BC_S_COND) 409 addr = entry->saddr; 410 else 411 addr = entry->daddr; 412 413 if (bitstring_match(addr, cond->addr, 414 cond->prefix_len)) 415 break; 416 if (entry->family == AF_INET6 && 417 cond->family == AF_INET) { 418 if (addr[0] == 0 && addr[1] == 0 && 419 addr[2] == htonl(0xffff) && 420 bitstring_match(addr + 3, cond->addr, 421 cond->prefix_len)) 422 break; 423 } 424 yes = 0; 425 break; 426 } 427 } 428 429 if (yes) { 430 len -= op->yes; 431 bc += op->yes; 432 } else { 433 len -= op->no; 434 bc += op->no; 435 } 436 } 437 return len == 0; 438 } 439 440 static int valid_cc(const void *bc, int len, int cc) 441 { 442 while (len >= 0) { 443 const struct inet_diag_bc_op *op = bc; 444 445 if (cc > len) 446 return 0; 447 if (cc == len) 448 return 1; 449 if (op->yes < 4 || op->yes & 3) 450 return 0; 451 len -= op->yes; 452 bc += op->yes; 453 } 454 return 0; 455 } 456 457 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 458 { 459 const void *bc = bytecode; 460 int len = bytecode_len; 461 462 while (len > 0) { 463 const struct inet_diag_bc_op *op = bc; 464 465 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 466 switch (op->code) { 467 case INET_DIAG_BC_AUTO: 468 case INET_DIAG_BC_S_COND: 469 case INET_DIAG_BC_D_COND: 470 case INET_DIAG_BC_S_GE: 471 case INET_DIAG_BC_S_LE: 472 case INET_DIAG_BC_D_GE: 473 case INET_DIAG_BC_D_LE: 474 case INET_DIAG_BC_JMP: 475 if (op->no < 4 || op->no > len + 4 || op->no & 3) 476 return -EINVAL; 477 if (op->no < len && 478 !valid_cc(bytecode, bytecode_len, len - op->no)) 479 return -EINVAL; 480 break; 481 case INET_DIAG_BC_NOP: 482 break; 483 default: 484 return -EINVAL; 485 } 486 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3) 487 return -EINVAL; 488 bc += op->yes; 489 len -= op->yes; 490 } 491 return len == 0 ? 0 : -EINVAL; 492 } 493 494 static int inet_csk_diag_dump(struct sock *sk, 495 struct sk_buff *skb, 496 struct netlink_callback *cb) 497 { 498 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 499 500 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) { 501 struct inet_diag_entry entry; 502 const struct nlattr *bc = nlmsg_find_attr(cb->nlh, 503 sizeof(*r), 504 INET_DIAG_REQ_BYTECODE); 505 struct inet_sock *inet = inet_sk(sk); 506 507 entry.family = sk->sk_family; 508 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 509 if (entry.family == AF_INET6) { 510 struct ipv6_pinfo *np = inet6_sk(sk); 511 512 entry.saddr = np->rcv_saddr.s6_addr32; 513 entry.daddr = np->daddr.s6_addr32; 514 } else 515 #endif 516 { 517 entry.saddr = &inet->inet_rcv_saddr; 518 entry.daddr = &inet->inet_daddr; 519 } 520 entry.sport = inet->inet_num; 521 entry.dport = ntohs(inet->inet_dport); 522 entry.userlocks = sk->sk_userlocks; 523 524 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry)) 525 return 0; 526 } 527 528 return inet_csk_diag_fill(sk, skb, r->idiag_ext, 529 NETLINK_CB(cb->skb).pid, 530 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 531 } 532 533 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 534 struct sk_buff *skb, 535 struct netlink_callback *cb) 536 { 537 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 538 539 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) { 540 struct inet_diag_entry entry; 541 const struct nlattr *bc = nlmsg_find_attr(cb->nlh, 542 sizeof(*r), 543 INET_DIAG_REQ_BYTECODE); 544 545 entry.family = tw->tw_family; 546 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 547 if (tw->tw_family == AF_INET6) { 548 struct inet6_timewait_sock *tw6 = 549 inet6_twsk((struct sock *)tw); 550 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 551 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 552 } else 553 #endif 554 { 555 entry.saddr = &tw->tw_rcv_saddr; 556 entry.daddr = &tw->tw_daddr; 557 } 558 entry.sport = tw->tw_num; 559 entry.dport = ntohs(tw->tw_dport); 560 entry.userlocks = 0; 561 562 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry)) 563 return 0; 564 } 565 566 return inet_twsk_diag_fill(tw, skb, r->idiag_ext, 567 NETLINK_CB(cb->skb).pid, 568 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 569 } 570 571 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 572 struct request_sock *req, u32 pid, u32 seq, 573 const struct nlmsghdr *unlh) 574 { 575 const struct inet_request_sock *ireq = inet_rsk(req); 576 struct inet_sock *inet = inet_sk(sk); 577 unsigned char *b = skb_tail_pointer(skb); 578 struct inet_diag_msg *r; 579 struct nlmsghdr *nlh; 580 long tmo; 581 582 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 583 nlh->nlmsg_flags = NLM_F_MULTI; 584 r = NLMSG_DATA(nlh); 585 586 r->idiag_family = sk->sk_family; 587 r->idiag_state = TCP_SYN_RECV; 588 r->idiag_timer = 1; 589 r->idiag_retrans = req->retrans; 590 591 r->id.idiag_if = sk->sk_bound_dev_if; 592 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 593 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 594 595 tmo = req->expires - jiffies; 596 if (tmo < 0) 597 tmo = 0; 598 599 r->id.idiag_sport = inet->inet_sport; 600 r->id.idiag_dport = ireq->rmt_port; 601 r->id.idiag_src[0] = ireq->loc_addr; 602 r->id.idiag_dst[0] = ireq->rmt_addr; 603 r->idiag_expires = jiffies_to_msecs(tmo); 604 r->idiag_rqueue = 0; 605 r->idiag_wqueue = 0; 606 r->idiag_uid = sock_i_uid(sk); 607 r->idiag_inode = 0; 608 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 609 if (r->idiag_family == AF_INET6) { 610 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 611 &inet6_rsk(req)->loc_addr); 612 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 613 &inet6_rsk(req)->rmt_addr); 614 } 615 #endif 616 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 617 618 return skb->len; 619 620 nlmsg_failure: 621 nlmsg_trim(skb, b); 622 return -1; 623 } 624 625 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 626 struct netlink_callback *cb) 627 { 628 struct inet_diag_entry entry; 629 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 630 struct inet_connection_sock *icsk = inet_csk(sk); 631 struct listen_sock *lopt; 632 const struct nlattr *bc = NULL; 633 struct inet_sock *inet = inet_sk(sk); 634 int j, s_j; 635 int reqnum, s_reqnum; 636 int err = 0; 637 638 s_j = cb->args[3]; 639 s_reqnum = cb->args[4]; 640 641 if (s_j > 0) 642 s_j--; 643 644 entry.family = sk->sk_family; 645 646 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 647 648 lopt = icsk->icsk_accept_queue.listen_opt; 649 if (!lopt || !lopt->qlen) 650 goto out; 651 652 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) { 653 bc = nlmsg_find_attr(cb->nlh, sizeof(*r), 654 INET_DIAG_REQ_BYTECODE); 655 entry.sport = inet->inet_num; 656 entry.userlocks = sk->sk_userlocks; 657 } 658 659 for (j = s_j; j < lopt->nr_table_entries; j++) { 660 struct request_sock *req, *head = lopt->syn_table[j]; 661 662 reqnum = 0; 663 for (req = head; req; reqnum++, req = req->dl_next) { 664 struct inet_request_sock *ireq = inet_rsk(req); 665 666 if (reqnum < s_reqnum) 667 continue; 668 if (r->id.idiag_dport != ireq->rmt_port && 669 r->id.idiag_dport) 670 continue; 671 672 if (bc) { 673 entry.saddr = 674 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 675 (entry.family == AF_INET6) ? 676 inet6_rsk(req)->loc_addr.s6_addr32 : 677 #endif 678 &ireq->loc_addr; 679 entry.daddr = 680 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 681 (entry.family == AF_INET6) ? 682 inet6_rsk(req)->rmt_addr.s6_addr32 : 683 #endif 684 &ireq->rmt_addr; 685 entry.dport = ntohs(ireq->rmt_port); 686 687 if (!inet_diag_bc_run(nla_data(bc), 688 nla_len(bc), &entry)) 689 continue; 690 } 691 692 err = inet_diag_fill_req(skb, sk, req, 693 NETLINK_CB(cb->skb).pid, 694 cb->nlh->nlmsg_seq, cb->nlh); 695 if (err < 0) { 696 cb->args[3] = j + 1; 697 cb->args[4] = reqnum; 698 goto out; 699 } 700 } 701 702 s_reqnum = 0; 703 } 704 705 out: 706 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 707 708 return err; 709 } 710 711 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 712 { 713 int i, num; 714 int s_i, s_num; 715 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 716 const struct inet_diag_handler *handler; 717 struct inet_hashinfo *hashinfo; 718 719 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type); 720 if (IS_ERR(handler)) 721 goto unlock; 722 723 hashinfo = handler->idiag_hashinfo; 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->id.idiag_sport != inet->inet_sport && 749 r->id.idiag_sport) 750 goto next_listen; 751 752 if (!(r->idiag_states & TCPF_LISTEN) || 753 r->id.idiag_dport || 754 cb->args[3] > 0) 755 goto syn_recv; 756 757 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 758 spin_unlock_bh(&ilb->lock); 759 goto done; 760 } 761 762 syn_recv: 763 if (!(r->idiag_states & TCPF_SYN_RECV)) 764 goto next_listen; 765 766 if (inet_diag_dump_reqs(skb, sk, cb) < 0) { 767 spin_unlock_bh(&ilb->lock); 768 goto done; 769 } 770 771 next_listen: 772 cb->args[3] = 0; 773 cb->args[4] = 0; 774 ++num; 775 } 776 spin_unlock_bh(&ilb->lock); 777 778 s_num = 0; 779 cb->args[3] = 0; 780 cb->args[4] = 0; 781 } 782 skip_listen_ht: 783 cb->args[0] = 1; 784 s_i = num = s_num = 0; 785 } 786 787 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 788 goto unlock; 789 790 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 791 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 792 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 793 struct sock *sk; 794 struct hlist_nulls_node *node; 795 796 num = 0; 797 798 if (hlist_nulls_empty(&head->chain) && 799 hlist_nulls_empty(&head->twchain)) 800 continue; 801 802 if (i > s_i) 803 s_num = 0; 804 805 spin_lock_bh(lock); 806 sk_nulls_for_each(sk, node, &head->chain) { 807 struct inet_sock *inet = inet_sk(sk); 808 809 if (num < s_num) 810 goto next_normal; 811 if (!(r->idiag_states & (1 << sk->sk_state))) 812 goto next_normal; 813 if (r->id.idiag_sport != inet->inet_sport && 814 r->id.idiag_sport) 815 goto next_normal; 816 if (r->id.idiag_dport != inet->inet_dport && 817 r->id.idiag_dport) 818 goto next_normal; 819 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 820 spin_unlock_bh(lock); 821 goto done; 822 } 823 next_normal: 824 ++num; 825 } 826 827 if (r->idiag_states & TCPF_TIME_WAIT) { 828 struct inet_timewait_sock *tw; 829 830 inet_twsk_for_each(tw, node, 831 &head->twchain) { 832 833 if (num < s_num) 834 goto next_dying; 835 if (r->id.idiag_sport != tw->tw_sport && 836 r->id.idiag_sport) 837 goto next_dying; 838 if (r->id.idiag_dport != tw->tw_dport && 839 r->id.idiag_dport) 840 goto next_dying; 841 if (inet_twsk_diag_dump(tw, skb, cb) < 0) { 842 spin_unlock_bh(lock); 843 goto done; 844 } 845 next_dying: 846 ++num; 847 } 848 } 849 spin_unlock_bh(lock); 850 } 851 852 done: 853 cb->args[1] = i; 854 cb->args[2] = num; 855 unlock: 856 inet_diag_unlock_handler(handler); 857 return skb->len; 858 } 859 860 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 861 { 862 int hdrlen = sizeof(struct inet_diag_req); 863 864 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 865 nlmsg_len(nlh) < hdrlen) 866 return -EINVAL; 867 868 if (nlh->nlmsg_flags & NLM_F_DUMP) { 869 if (nlmsg_attrlen(nlh, hdrlen)) { 870 struct nlattr *attr; 871 872 attr = nlmsg_find_attr(nlh, hdrlen, 873 INET_DIAG_REQ_BYTECODE); 874 if (attr == NULL || 875 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 876 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 877 return -EINVAL; 878 } 879 880 return netlink_dump_start(idiagnl, skb, nlh, 881 inet_diag_dump, NULL, 0); 882 } 883 884 return inet_diag_get_exact(skb, nlh); 885 } 886 887 static DEFINE_MUTEX(inet_diag_mutex); 888 889 static void inet_diag_rcv(struct sk_buff *skb) 890 { 891 mutex_lock(&inet_diag_mutex); 892 netlink_rcv_skb(skb, &inet_diag_rcv_msg); 893 mutex_unlock(&inet_diag_mutex); 894 } 895 896 int inet_diag_register(const struct inet_diag_handler *h) 897 { 898 const __u16 type = h->idiag_type; 899 int err = -EINVAL; 900 901 if (type >= INET_DIAG_GETSOCK_MAX) 902 goto out; 903 904 mutex_lock(&inet_diag_table_mutex); 905 err = -EEXIST; 906 if (inet_diag_table[type] == NULL) { 907 inet_diag_table[type] = h; 908 err = 0; 909 } 910 mutex_unlock(&inet_diag_table_mutex); 911 out: 912 return err; 913 } 914 EXPORT_SYMBOL_GPL(inet_diag_register); 915 916 void inet_diag_unregister(const struct inet_diag_handler *h) 917 { 918 const __u16 type = h->idiag_type; 919 920 if (type >= INET_DIAG_GETSOCK_MAX) 921 return; 922 923 mutex_lock(&inet_diag_table_mutex); 924 inet_diag_table[type] = NULL; 925 mutex_unlock(&inet_diag_table_mutex); 926 } 927 EXPORT_SYMBOL_GPL(inet_diag_unregister); 928 929 static int __init inet_diag_init(void) 930 { 931 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX * 932 sizeof(struct inet_diag_handler *)); 933 int err = -ENOMEM; 934 935 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 936 if (!inet_diag_table) 937 goto out; 938 939 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0, 940 inet_diag_rcv, NULL, THIS_MODULE); 941 if (idiagnl == NULL) 942 goto out_free_table; 943 err = 0; 944 out: 945 return err; 946 out_free_table: 947 kfree(inet_diag_table); 948 goto out; 949 } 950 951 static void __exit inet_diag_exit(void) 952 { 953 netlink_kernel_release(idiagnl); 954 kfree(inet_diag_table); 955 } 956 957 module_init(inet_diag_init); 958 module_exit(inet_diag_exit); 959 MODULE_LICENSE("GPL"); 960 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG); 961