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 int inet_diag_check_cookie(struct sock *sk, struct inet_diag_req *req) 250 { 251 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || 252 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && 253 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || 254 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) 255 return -ESTALE; 256 else 257 return 0; 258 } 259 EXPORT_SYMBOL_GPL(inet_diag_check_cookie); 260 261 static int inet_diag_get_exact(struct sk_buff *in_skb, 262 const struct nlmsghdr *nlh, 263 struct inet_diag_req *req) 264 { 265 int err; 266 struct sock *sk; 267 struct sk_buff *rep; 268 struct inet_hashinfo *hashinfo; 269 const struct inet_diag_handler *handler; 270 271 handler = inet_diag_lock_handler(req->sdiag_protocol); 272 if (IS_ERR(handler)) { 273 err = PTR_ERR(handler); 274 goto unlock; 275 } 276 277 hashinfo = handler->idiag_hashinfo; 278 err = -EINVAL; 279 280 if (req->sdiag_family == AF_INET) { 281 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], 282 req->id.idiag_dport, req->id.idiag_src[0], 283 req->id.idiag_sport, req->id.idiag_if); 284 } 285 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 286 else if (req->sdiag_family == AF_INET6) { 287 sk = inet6_lookup(&init_net, hashinfo, 288 (struct in6_addr *)req->id.idiag_dst, 289 req->id.idiag_dport, 290 (struct in6_addr *)req->id.idiag_src, 291 req->id.idiag_sport, 292 req->id.idiag_if); 293 } 294 #endif 295 else { 296 goto unlock; 297 } 298 299 err = -ENOENT; 300 if (sk == NULL) 301 goto unlock; 302 303 err = inet_diag_check_cookie(sk, req); 304 if (err) 305 goto out; 306 307 err = -ENOMEM; 308 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 309 sizeof(struct inet_diag_meminfo) + 310 sizeof(struct tcp_info) + 64)), 311 GFP_KERNEL); 312 if (!rep) 313 goto out; 314 315 err = sk_diag_fill(sk, rep, req, 316 NETLINK_CB(in_skb).pid, 317 nlh->nlmsg_seq, 0, nlh); 318 if (err < 0) { 319 WARN_ON(err == -EMSGSIZE); 320 kfree_skb(rep); 321 goto out; 322 } 323 err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid, 324 MSG_DONTWAIT); 325 if (err > 0) 326 err = 0; 327 328 out: 329 if (sk) { 330 if (sk->sk_state == TCP_TIME_WAIT) 331 inet_twsk_put((struct inet_timewait_sock *)sk); 332 else 333 sock_put(sk); 334 } 335 unlock: 336 inet_diag_unlock_handler(handler); 337 return err; 338 } 339 340 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 341 { 342 int words = bits >> 5; 343 344 bits &= 0x1f; 345 346 if (words) { 347 if (memcmp(a1, a2, words << 2)) 348 return 0; 349 } 350 if (bits) { 351 __be32 w1, w2; 352 __be32 mask; 353 354 w1 = a1[words]; 355 w2 = a2[words]; 356 357 mask = htonl((0xffffffff) << (32 - bits)); 358 359 if ((w1 ^ w2) & mask) 360 return 0; 361 } 362 363 return 1; 364 } 365 366 367 static int inet_diag_bc_run(const struct nlattr *_bc, 368 const struct inet_diag_entry *entry) 369 { 370 const void *bc = nla_data(_bc); 371 int len = nla_len(_bc); 372 373 while (len > 0) { 374 int yes = 1; 375 const struct inet_diag_bc_op *op = bc; 376 377 switch (op->code) { 378 case INET_DIAG_BC_NOP: 379 break; 380 case INET_DIAG_BC_JMP: 381 yes = 0; 382 break; 383 case INET_DIAG_BC_S_GE: 384 yes = entry->sport >= op[1].no; 385 break; 386 case INET_DIAG_BC_S_LE: 387 yes = entry->sport <= op[1].no; 388 break; 389 case INET_DIAG_BC_D_GE: 390 yes = entry->dport >= op[1].no; 391 break; 392 case INET_DIAG_BC_D_LE: 393 yes = entry->dport <= op[1].no; 394 break; 395 case INET_DIAG_BC_AUTO: 396 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 397 break; 398 case INET_DIAG_BC_S_COND: 399 case INET_DIAG_BC_D_COND: { 400 struct inet_diag_hostcond *cond; 401 __be32 *addr; 402 403 cond = (struct inet_diag_hostcond *)(op + 1); 404 if (cond->port != -1 && 405 cond->port != (op->code == INET_DIAG_BC_S_COND ? 406 entry->sport : entry->dport)) { 407 yes = 0; 408 break; 409 } 410 411 if (cond->prefix_len == 0) 412 break; 413 414 if (op->code == INET_DIAG_BC_S_COND) 415 addr = entry->saddr; 416 else 417 addr = entry->daddr; 418 419 if (bitstring_match(addr, cond->addr, 420 cond->prefix_len)) 421 break; 422 if (entry->family == AF_INET6 && 423 cond->family == AF_INET) { 424 if (addr[0] == 0 && addr[1] == 0 && 425 addr[2] == htonl(0xffff) && 426 bitstring_match(addr + 3, cond->addr, 427 cond->prefix_len)) 428 break; 429 } 430 yes = 0; 431 break; 432 } 433 } 434 435 if (yes) { 436 len -= op->yes; 437 bc += op->yes; 438 } else { 439 len -= op->no; 440 bc += op->no; 441 } 442 } 443 return len == 0; 444 } 445 446 static int valid_cc(const void *bc, int len, int cc) 447 { 448 while (len >= 0) { 449 const struct inet_diag_bc_op *op = bc; 450 451 if (cc > len) 452 return 0; 453 if (cc == len) 454 return 1; 455 if (op->yes < 4 || op->yes & 3) 456 return 0; 457 len -= op->yes; 458 bc += op->yes; 459 } 460 return 0; 461 } 462 463 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 464 { 465 const void *bc = bytecode; 466 int len = bytecode_len; 467 468 while (len > 0) { 469 const struct inet_diag_bc_op *op = bc; 470 471 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 472 switch (op->code) { 473 case INET_DIAG_BC_AUTO: 474 case INET_DIAG_BC_S_COND: 475 case INET_DIAG_BC_D_COND: 476 case INET_DIAG_BC_S_GE: 477 case INET_DIAG_BC_S_LE: 478 case INET_DIAG_BC_D_GE: 479 case INET_DIAG_BC_D_LE: 480 case INET_DIAG_BC_JMP: 481 if (op->no < 4 || op->no > len + 4 || op->no & 3) 482 return -EINVAL; 483 if (op->no < len && 484 !valid_cc(bytecode, bytecode_len, len - op->no)) 485 return -EINVAL; 486 break; 487 case INET_DIAG_BC_NOP: 488 break; 489 default: 490 return -EINVAL; 491 } 492 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3) 493 return -EINVAL; 494 bc += op->yes; 495 len -= op->yes; 496 } 497 return len == 0 ? 0 : -EINVAL; 498 } 499 500 static int inet_csk_diag_dump(struct sock *sk, 501 struct sk_buff *skb, 502 struct netlink_callback *cb, 503 struct inet_diag_req *r, 504 const struct nlattr *bc) 505 { 506 if (bc != NULL) { 507 struct inet_diag_entry entry; 508 struct inet_sock *inet = inet_sk(sk); 509 510 entry.family = sk->sk_family; 511 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 512 if (entry.family == AF_INET6) { 513 struct ipv6_pinfo *np = inet6_sk(sk); 514 515 entry.saddr = np->rcv_saddr.s6_addr32; 516 entry.daddr = np->daddr.s6_addr32; 517 } else 518 #endif 519 { 520 entry.saddr = &inet->inet_rcv_saddr; 521 entry.daddr = &inet->inet_daddr; 522 } 523 entry.sport = inet->inet_num; 524 entry.dport = ntohs(inet->inet_dport); 525 entry.userlocks = sk->sk_userlocks; 526 527 if (!inet_diag_bc_run(bc, &entry)) 528 return 0; 529 } 530 531 return inet_csk_diag_fill(sk, skb, r, 532 NETLINK_CB(cb->skb).pid, 533 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 534 } 535 536 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 537 struct sk_buff *skb, 538 struct netlink_callback *cb, 539 struct inet_diag_req *r, 540 const struct nlattr *bc) 541 { 542 if (bc != NULL) { 543 struct inet_diag_entry entry; 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(bc, &entry)) 563 return 0; 564 } 565 566 return inet_twsk_diag_fill(tw, skb, r, 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 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr; 611 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr; 612 } 613 #endif 614 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 615 616 return skb->len; 617 618 nlmsg_failure: 619 nlmsg_trim(skb, b); 620 return -1; 621 } 622 623 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 624 struct netlink_callback *cb, 625 struct inet_diag_req *r, 626 const struct nlattr *bc) 627 { 628 struct inet_diag_entry entry; 629 struct inet_connection_sock *icsk = inet_csk(sk); 630 struct listen_sock *lopt; 631 struct inet_sock *inet = inet_sk(sk); 632 int j, s_j; 633 int reqnum, s_reqnum; 634 int err = 0; 635 636 s_j = cb->args[3]; 637 s_reqnum = cb->args[4]; 638 639 if (s_j > 0) 640 s_j--; 641 642 entry.family = sk->sk_family; 643 644 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 645 646 lopt = icsk->icsk_accept_queue.listen_opt; 647 if (!lopt || !lopt->qlen) 648 goto out; 649 650 if (bc != NULL) { 651 entry.sport = inet->inet_num; 652 entry.userlocks = sk->sk_userlocks; 653 } 654 655 for (j = s_j; j < lopt->nr_table_entries; j++) { 656 struct request_sock *req, *head = lopt->syn_table[j]; 657 658 reqnum = 0; 659 for (req = head; req; reqnum++, req = req->dl_next) { 660 struct inet_request_sock *ireq = inet_rsk(req); 661 662 if (reqnum < s_reqnum) 663 continue; 664 if (r->id.idiag_dport != ireq->rmt_port && 665 r->id.idiag_dport) 666 continue; 667 668 if (bc) { 669 entry.saddr = 670 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 671 (entry.family == AF_INET6) ? 672 inet6_rsk(req)->loc_addr.s6_addr32 : 673 #endif 674 &ireq->loc_addr; 675 entry.daddr = 676 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 677 (entry.family == AF_INET6) ? 678 inet6_rsk(req)->rmt_addr.s6_addr32 : 679 #endif 680 &ireq->rmt_addr; 681 entry.dport = ntohs(ireq->rmt_port); 682 683 if (!inet_diag_bc_run(bc, &entry)) 684 continue; 685 } 686 687 err = inet_diag_fill_req(skb, sk, req, 688 NETLINK_CB(cb->skb).pid, 689 cb->nlh->nlmsg_seq, cb->nlh); 690 if (err < 0) { 691 cb->args[3] = j + 1; 692 cb->args[4] = reqnum; 693 goto out; 694 } 695 } 696 697 s_reqnum = 0; 698 } 699 700 out: 701 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 702 703 return err; 704 } 705 706 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 707 struct inet_diag_req *r, struct nlattr *bc) 708 { 709 int i, num; 710 int s_i, s_num; 711 const struct inet_diag_handler *handler; 712 struct inet_hashinfo *hashinfo; 713 714 handler = inet_diag_lock_handler(r->sdiag_protocol); 715 if (IS_ERR(handler)) 716 goto unlock; 717 718 hashinfo = handler->idiag_hashinfo; 719 720 s_i = cb->args[1]; 721 s_num = num = cb->args[2]; 722 723 if (cb->args[0] == 0) { 724 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 725 goto skip_listen_ht; 726 727 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 728 struct sock *sk; 729 struct hlist_nulls_node *node; 730 struct inet_listen_hashbucket *ilb; 731 732 num = 0; 733 ilb = &hashinfo->listening_hash[i]; 734 spin_lock_bh(&ilb->lock); 735 sk_nulls_for_each(sk, node, &ilb->head) { 736 struct inet_sock *inet = inet_sk(sk); 737 738 if (num < s_num) { 739 num++; 740 continue; 741 } 742 743 if (r->sdiag_family != AF_UNSPEC && 744 sk->sk_family != r->sdiag_family) 745 goto next_listen; 746 747 if (r->id.idiag_sport != inet->inet_sport && 748 r->id.idiag_sport) 749 goto next_listen; 750 751 if (!(r->idiag_states & TCPF_LISTEN) || 752 r->id.idiag_dport || 753 cb->args[3] > 0) 754 goto syn_recv; 755 756 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 757 spin_unlock_bh(&ilb->lock); 758 goto done; 759 } 760 761 syn_recv: 762 if (!(r->idiag_states & TCPF_SYN_RECV)) 763 goto next_listen; 764 765 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) { 766 spin_unlock_bh(&ilb->lock); 767 goto done; 768 } 769 770 next_listen: 771 cb->args[3] = 0; 772 cb->args[4] = 0; 773 ++num; 774 } 775 spin_unlock_bh(&ilb->lock); 776 777 s_num = 0; 778 cb->args[3] = 0; 779 cb->args[4] = 0; 780 } 781 skip_listen_ht: 782 cb->args[0] = 1; 783 s_i = num = s_num = 0; 784 } 785 786 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 787 goto unlock; 788 789 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 790 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 791 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 792 struct sock *sk; 793 struct hlist_nulls_node *node; 794 795 num = 0; 796 797 if (hlist_nulls_empty(&head->chain) && 798 hlist_nulls_empty(&head->twchain)) 799 continue; 800 801 if (i > s_i) 802 s_num = 0; 803 804 spin_lock_bh(lock); 805 sk_nulls_for_each(sk, node, &head->chain) { 806 struct inet_sock *inet = inet_sk(sk); 807 808 if (num < s_num) 809 goto next_normal; 810 if (!(r->idiag_states & (1 << sk->sk_state))) 811 goto next_normal; 812 if (r->sdiag_family != AF_UNSPEC && 813 sk->sk_family != r->sdiag_family) 814 goto next_normal; 815 if (r->id.idiag_sport != inet->inet_sport && 816 r->id.idiag_sport) 817 goto next_normal; 818 if (r->id.idiag_dport != inet->inet_dport && 819 r->id.idiag_dport) 820 goto next_normal; 821 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 822 spin_unlock_bh(lock); 823 goto done; 824 } 825 next_normal: 826 ++num; 827 } 828 829 if (r->idiag_states & TCPF_TIME_WAIT) { 830 struct inet_timewait_sock *tw; 831 832 inet_twsk_for_each(tw, node, 833 &head->twchain) { 834 835 if (num < s_num) 836 goto next_dying; 837 if (r->sdiag_family != AF_UNSPEC && 838 tw->tw_family != r->sdiag_family) 839 goto next_dying; 840 if (r->id.idiag_sport != tw->tw_sport && 841 r->id.idiag_sport) 842 goto next_dying; 843 if (r->id.idiag_dport != tw->tw_dport && 844 r->id.idiag_dport) 845 goto next_dying; 846 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) { 847 spin_unlock_bh(lock); 848 goto done; 849 } 850 next_dying: 851 ++num; 852 } 853 } 854 spin_unlock_bh(lock); 855 } 856 857 done: 858 cb->args[1] = i; 859 cb->args[2] = num; 860 unlock: 861 inet_diag_unlock_handler(handler); 862 return skb->len; 863 } 864 865 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 866 { 867 struct nlattr *bc = NULL; 868 int hdrlen = sizeof(struct inet_diag_req); 869 870 if (nlmsg_attrlen(cb->nlh, hdrlen)) 871 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 872 873 return __inet_diag_dump(skb, cb, (struct inet_diag_req *)NLMSG_DATA(cb->nlh), bc); 874 } 875 876 static inline int inet_diag_type2proto(int type) 877 { 878 switch (type) { 879 case TCPDIAG_GETSOCK: 880 return IPPROTO_TCP; 881 case DCCPDIAG_GETSOCK: 882 return IPPROTO_DCCP; 883 default: 884 return 0; 885 } 886 } 887 888 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb) 889 { 890 struct inet_diag_req_compat *rc = NLMSG_DATA(cb->nlh); 891 struct inet_diag_req req; 892 struct nlattr *bc = NULL; 893 int hdrlen = sizeof(struct inet_diag_req_compat); 894 895 req.sdiag_family = AF_UNSPEC; /* compatibility */ 896 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 897 req.idiag_ext = rc->idiag_ext; 898 req.idiag_states = rc->idiag_states; 899 req.id = rc->id; 900 901 if (nlmsg_attrlen(cb->nlh, hdrlen)) 902 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 903 904 return __inet_diag_dump(skb, cb, &req, bc); 905 } 906 907 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 908 const struct nlmsghdr *nlh) 909 { 910 struct inet_diag_req_compat *rc = NLMSG_DATA(nlh); 911 struct inet_diag_req req; 912 913 req.sdiag_family = rc->idiag_family; 914 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 915 req.idiag_ext = rc->idiag_ext; 916 req.idiag_states = rc->idiag_states; 917 req.id = rc->id; 918 919 return inet_diag_get_exact(in_skb, nlh, &req); 920 } 921 922 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 923 { 924 int hdrlen = sizeof(struct inet_diag_req_compat); 925 926 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 927 nlmsg_len(nlh) < hdrlen) 928 return -EINVAL; 929 930 if (nlh->nlmsg_flags & NLM_F_DUMP) { 931 if (nlmsg_attrlen(nlh, hdrlen)) { 932 struct nlattr *attr; 933 934 attr = nlmsg_find_attr(nlh, hdrlen, 935 INET_DIAG_REQ_BYTECODE); 936 if (attr == NULL || 937 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 938 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 939 return -EINVAL; 940 } 941 942 return netlink_dump_start(sock_diag_nlsk, skb, nlh, 943 inet_diag_dump_compat, NULL, 0); 944 } 945 946 return inet_diag_get_exact_compat(skb, nlh); 947 } 948 949 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) 950 { 951 int hdrlen = sizeof(struct inet_diag_req); 952 953 if (nlmsg_len(h) < hdrlen) 954 return -EINVAL; 955 956 if (h->nlmsg_flags & NLM_F_DUMP) { 957 if (nlmsg_attrlen(h, hdrlen)) { 958 struct nlattr *attr; 959 attr = nlmsg_find_attr(h, hdrlen, 960 INET_DIAG_REQ_BYTECODE); 961 if (attr == NULL || 962 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 963 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 964 return -EINVAL; 965 } 966 967 return netlink_dump_start(sock_diag_nlsk, skb, h, 968 inet_diag_dump, NULL, 0); 969 } 970 971 return inet_diag_get_exact(skb, h, (struct inet_diag_req *)NLMSG_DATA(h)); 972 } 973 974 static struct sock_diag_handler inet_diag_handler = { 975 .family = AF_INET, 976 .dump = inet_diag_handler_dump, 977 }; 978 979 static struct sock_diag_handler inet6_diag_handler = { 980 .family = AF_INET6, 981 .dump = inet_diag_handler_dump, 982 }; 983 984 int inet_diag_register(const struct inet_diag_handler *h) 985 { 986 const __u16 type = h->idiag_type; 987 int err = -EINVAL; 988 989 if (type >= IPPROTO_MAX) 990 goto out; 991 992 mutex_lock(&inet_diag_table_mutex); 993 err = -EEXIST; 994 if (inet_diag_table[type] == NULL) { 995 inet_diag_table[type] = h; 996 err = 0; 997 } 998 mutex_unlock(&inet_diag_table_mutex); 999 out: 1000 return err; 1001 } 1002 EXPORT_SYMBOL_GPL(inet_diag_register); 1003 1004 void inet_diag_unregister(const struct inet_diag_handler *h) 1005 { 1006 const __u16 type = h->idiag_type; 1007 1008 if (type >= IPPROTO_MAX) 1009 return; 1010 1011 mutex_lock(&inet_diag_table_mutex); 1012 inet_diag_table[type] = NULL; 1013 mutex_unlock(&inet_diag_table_mutex); 1014 } 1015 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1016 1017 static int __init inet_diag_init(void) 1018 { 1019 const int inet_diag_table_size = (IPPROTO_MAX * 1020 sizeof(struct inet_diag_handler *)); 1021 int err = -ENOMEM; 1022 1023 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1024 if (!inet_diag_table) 1025 goto out; 1026 1027 err = sock_diag_register(&inet_diag_handler); 1028 if (err) 1029 goto out_free_nl; 1030 1031 err = sock_diag_register(&inet6_diag_handler); 1032 if (err) 1033 goto out_free_inet; 1034 1035 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1036 out: 1037 return err; 1038 1039 out_free_inet: 1040 sock_diag_unregister(&inet_diag_handler); 1041 out_free_nl: 1042 kfree(inet_diag_table); 1043 goto out; 1044 } 1045 1046 static void __exit inet_diag_exit(void) 1047 { 1048 sock_diag_unregister(&inet6_diag_handler); 1049 sock_diag_unregister(&inet_diag_handler); 1050 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1051 kfree(inet_diag_table); 1052 } 1053 1054 module_init(inet_diag_init); 1055 module_exit(inet_diag_exit); 1056 MODULE_LICENSE("GPL"); 1057 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 0); 1058