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 void *bc, int len, 359 const struct inet_diag_entry *entry) 360 { 361 while (len > 0) { 362 int yes = 1; 363 const struct inet_diag_bc_op *op = bc; 364 365 switch (op->code) { 366 case INET_DIAG_BC_NOP: 367 break; 368 case INET_DIAG_BC_JMP: 369 yes = 0; 370 break; 371 case INET_DIAG_BC_S_GE: 372 yes = entry->sport >= op[1].no; 373 break; 374 case INET_DIAG_BC_S_LE: 375 yes = entry->sport <= op[1].no; 376 break; 377 case INET_DIAG_BC_D_GE: 378 yes = entry->dport >= op[1].no; 379 break; 380 case INET_DIAG_BC_D_LE: 381 yes = entry->dport <= op[1].no; 382 break; 383 case INET_DIAG_BC_AUTO: 384 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 385 break; 386 case INET_DIAG_BC_S_COND: 387 case INET_DIAG_BC_D_COND: { 388 struct inet_diag_hostcond *cond; 389 __be32 *addr; 390 391 cond = (struct inet_diag_hostcond *)(op + 1); 392 if (cond->port != -1 && 393 cond->port != (op->code == INET_DIAG_BC_S_COND ? 394 entry->sport : entry->dport)) { 395 yes = 0; 396 break; 397 } 398 399 if (cond->prefix_len == 0) 400 break; 401 402 if (op->code == INET_DIAG_BC_S_COND) 403 addr = entry->saddr; 404 else 405 addr = entry->daddr; 406 407 if (bitstring_match(addr, cond->addr, 408 cond->prefix_len)) 409 break; 410 if (entry->family == AF_INET6 && 411 cond->family == AF_INET) { 412 if (addr[0] == 0 && addr[1] == 0 && 413 addr[2] == htonl(0xffff) && 414 bitstring_match(addr + 3, cond->addr, 415 cond->prefix_len)) 416 break; 417 } 418 yes = 0; 419 break; 420 } 421 } 422 423 if (yes) { 424 len -= op->yes; 425 bc += op->yes; 426 } else { 427 len -= op->no; 428 bc += op->no; 429 } 430 } 431 return len == 0; 432 } 433 434 static int valid_cc(const void *bc, int len, int cc) 435 { 436 while (len >= 0) { 437 const struct inet_diag_bc_op *op = bc; 438 439 if (cc > len) 440 return 0; 441 if (cc == len) 442 return 1; 443 if (op->yes < 4 || op->yes & 3) 444 return 0; 445 len -= op->yes; 446 bc += op->yes; 447 } 448 return 0; 449 } 450 451 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 452 { 453 const void *bc = bytecode; 454 int len = bytecode_len; 455 456 while (len > 0) { 457 const struct inet_diag_bc_op *op = bc; 458 459 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 460 switch (op->code) { 461 case INET_DIAG_BC_AUTO: 462 case INET_DIAG_BC_S_COND: 463 case INET_DIAG_BC_D_COND: 464 case INET_DIAG_BC_S_GE: 465 case INET_DIAG_BC_S_LE: 466 case INET_DIAG_BC_D_GE: 467 case INET_DIAG_BC_D_LE: 468 case INET_DIAG_BC_JMP: 469 if (op->no < 4 || op->no > len + 4 || op->no & 3) 470 return -EINVAL; 471 if (op->no < len && 472 !valid_cc(bytecode, bytecode_len, len - op->no)) 473 return -EINVAL; 474 break; 475 case INET_DIAG_BC_NOP: 476 break; 477 default: 478 return -EINVAL; 479 } 480 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3) 481 return -EINVAL; 482 bc += op->yes; 483 len -= op->yes; 484 } 485 return len == 0 ? 0 : -EINVAL; 486 } 487 488 static int inet_csk_diag_dump(struct sock *sk, 489 struct sk_buff *skb, 490 struct netlink_callback *cb, 491 struct inet_diag_req *r, 492 const struct nlattr *bc) 493 { 494 if (bc != NULL) { 495 struct inet_diag_entry entry; 496 struct inet_sock *inet = inet_sk(sk); 497 498 entry.family = sk->sk_family; 499 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 500 if (entry.family == AF_INET6) { 501 struct ipv6_pinfo *np = inet6_sk(sk); 502 503 entry.saddr = np->rcv_saddr.s6_addr32; 504 entry.daddr = np->daddr.s6_addr32; 505 } else 506 #endif 507 { 508 entry.saddr = &inet->inet_rcv_saddr; 509 entry.daddr = &inet->inet_daddr; 510 } 511 entry.sport = inet->inet_num; 512 entry.dport = ntohs(inet->inet_dport); 513 entry.userlocks = sk->sk_userlocks; 514 515 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry)) 516 return 0; 517 } 518 519 return inet_csk_diag_fill(sk, skb, r, 520 NETLINK_CB(cb->skb).pid, 521 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 522 } 523 524 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 525 struct sk_buff *skb, 526 struct netlink_callback *cb, 527 struct inet_diag_req *r, 528 const struct nlattr *bc) 529 { 530 if (bc != NULL) { 531 struct inet_diag_entry entry; 532 533 entry.family = tw->tw_family; 534 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 535 if (tw->tw_family == AF_INET6) { 536 struct inet6_timewait_sock *tw6 = 537 inet6_twsk((struct sock *)tw); 538 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 539 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 540 } else 541 #endif 542 { 543 entry.saddr = &tw->tw_rcv_saddr; 544 entry.daddr = &tw->tw_daddr; 545 } 546 entry.sport = tw->tw_num; 547 entry.dport = ntohs(tw->tw_dport); 548 entry.userlocks = 0; 549 550 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry)) 551 return 0; 552 } 553 554 return inet_twsk_diag_fill(tw, skb, r, 555 NETLINK_CB(cb->skb).pid, 556 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 557 } 558 559 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 560 struct request_sock *req, u32 pid, u32 seq, 561 const struct nlmsghdr *unlh) 562 { 563 const struct inet_request_sock *ireq = inet_rsk(req); 564 struct inet_sock *inet = inet_sk(sk); 565 unsigned char *b = skb_tail_pointer(skb); 566 struct inet_diag_msg *r; 567 struct nlmsghdr *nlh; 568 long tmo; 569 570 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 571 nlh->nlmsg_flags = NLM_F_MULTI; 572 r = NLMSG_DATA(nlh); 573 574 r->idiag_family = sk->sk_family; 575 r->idiag_state = TCP_SYN_RECV; 576 r->idiag_timer = 1; 577 r->idiag_retrans = req->retrans; 578 579 r->id.idiag_if = sk->sk_bound_dev_if; 580 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 581 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 582 583 tmo = req->expires - jiffies; 584 if (tmo < 0) 585 tmo = 0; 586 587 r->id.idiag_sport = inet->inet_sport; 588 r->id.idiag_dport = ireq->rmt_port; 589 r->id.idiag_src[0] = ireq->loc_addr; 590 r->id.idiag_dst[0] = ireq->rmt_addr; 591 r->idiag_expires = jiffies_to_msecs(tmo); 592 r->idiag_rqueue = 0; 593 r->idiag_wqueue = 0; 594 r->idiag_uid = sock_i_uid(sk); 595 r->idiag_inode = 0; 596 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 597 if (r->idiag_family == AF_INET6) { 598 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr; 599 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr; 600 } 601 #endif 602 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 603 604 return skb->len; 605 606 nlmsg_failure: 607 nlmsg_trim(skb, b); 608 return -1; 609 } 610 611 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 612 struct netlink_callback *cb, 613 struct inet_diag_req *r, 614 const struct nlattr *bc) 615 { 616 struct inet_diag_entry entry; 617 struct inet_connection_sock *icsk = inet_csk(sk); 618 struct listen_sock *lopt; 619 struct inet_sock *inet = inet_sk(sk); 620 int j, s_j; 621 int reqnum, s_reqnum; 622 int err = 0; 623 624 s_j = cb->args[3]; 625 s_reqnum = cb->args[4]; 626 627 if (s_j > 0) 628 s_j--; 629 630 entry.family = sk->sk_family; 631 632 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 633 634 lopt = icsk->icsk_accept_queue.listen_opt; 635 if (!lopt || !lopt->qlen) 636 goto out; 637 638 if (bc != NULL) { 639 entry.sport = inet->inet_num; 640 entry.userlocks = sk->sk_userlocks; 641 } 642 643 for (j = s_j; j < lopt->nr_table_entries; j++) { 644 struct request_sock *req, *head = lopt->syn_table[j]; 645 646 reqnum = 0; 647 for (req = head; req; reqnum++, req = req->dl_next) { 648 struct inet_request_sock *ireq = inet_rsk(req); 649 650 if (reqnum < s_reqnum) 651 continue; 652 if (r->id.idiag_dport != ireq->rmt_port && 653 r->id.idiag_dport) 654 continue; 655 656 if (bc) { 657 entry.saddr = 658 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 659 (entry.family == AF_INET6) ? 660 inet6_rsk(req)->loc_addr.s6_addr32 : 661 #endif 662 &ireq->loc_addr; 663 entry.daddr = 664 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 665 (entry.family == AF_INET6) ? 666 inet6_rsk(req)->rmt_addr.s6_addr32 : 667 #endif 668 &ireq->rmt_addr; 669 entry.dport = ntohs(ireq->rmt_port); 670 671 if (!inet_diag_bc_run(nla_data(bc), 672 nla_len(bc), &entry)) 673 continue; 674 } 675 676 err = inet_diag_fill_req(skb, sk, req, 677 NETLINK_CB(cb->skb).pid, 678 cb->nlh->nlmsg_seq, cb->nlh); 679 if (err < 0) { 680 cb->args[3] = j + 1; 681 cb->args[4] = reqnum; 682 goto out; 683 } 684 } 685 686 s_reqnum = 0; 687 } 688 689 out: 690 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 691 692 return err; 693 } 694 695 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 696 struct inet_diag_req *r, struct nlattr *bc) 697 { 698 int i, num; 699 int s_i, s_num; 700 const struct inet_diag_handler *handler; 701 struct inet_hashinfo *hashinfo; 702 703 handler = inet_diag_lock_handler(r->sdiag_protocol); 704 if (IS_ERR(handler)) 705 goto unlock; 706 707 hashinfo = handler->idiag_hashinfo; 708 709 s_i = cb->args[1]; 710 s_num = num = cb->args[2]; 711 712 if (cb->args[0] == 0) { 713 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 714 goto skip_listen_ht; 715 716 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 717 struct sock *sk; 718 struct hlist_nulls_node *node; 719 struct inet_listen_hashbucket *ilb; 720 721 num = 0; 722 ilb = &hashinfo->listening_hash[i]; 723 spin_lock_bh(&ilb->lock); 724 sk_nulls_for_each(sk, node, &ilb->head) { 725 struct inet_sock *inet = inet_sk(sk); 726 727 if (num < s_num) { 728 num++; 729 continue; 730 } 731 732 if (r->sdiag_family != AF_UNSPEC && 733 sk->sk_family != r->sdiag_family) 734 goto next_listen; 735 736 if (r->id.idiag_sport != inet->inet_sport && 737 r->id.idiag_sport) 738 goto next_listen; 739 740 if (!(r->idiag_states & TCPF_LISTEN) || 741 r->id.idiag_dport || 742 cb->args[3] > 0) 743 goto syn_recv; 744 745 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 746 spin_unlock_bh(&ilb->lock); 747 goto done; 748 } 749 750 syn_recv: 751 if (!(r->idiag_states & TCPF_SYN_RECV)) 752 goto next_listen; 753 754 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) { 755 spin_unlock_bh(&ilb->lock); 756 goto done; 757 } 758 759 next_listen: 760 cb->args[3] = 0; 761 cb->args[4] = 0; 762 ++num; 763 } 764 spin_unlock_bh(&ilb->lock); 765 766 s_num = 0; 767 cb->args[3] = 0; 768 cb->args[4] = 0; 769 } 770 skip_listen_ht: 771 cb->args[0] = 1; 772 s_i = num = s_num = 0; 773 } 774 775 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 776 goto unlock; 777 778 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 779 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 780 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 781 struct sock *sk; 782 struct hlist_nulls_node *node; 783 784 num = 0; 785 786 if (hlist_nulls_empty(&head->chain) && 787 hlist_nulls_empty(&head->twchain)) 788 continue; 789 790 if (i > s_i) 791 s_num = 0; 792 793 spin_lock_bh(lock); 794 sk_nulls_for_each(sk, node, &head->chain) { 795 struct inet_sock *inet = inet_sk(sk); 796 797 if (num < s_num) 798 goto next_normal; 799 if (!(r->idiag_states & (1 << sk->sk_state))) 800 goto next_normal; 801 if (r->sdiag_family != AF_UNSPEC && 802 sk->sk_family != r->sdiag_family) 803 goto next_normal; 804 if (r->id.idiag_sport != inet->inet_sport && 805 r->id.idiag_sport) 806 goto next_normal; 807 if (r->id.idiag_dport != inet->inet_dport && 808 r->id.idiag_dport) 809 goto next_normal; 810 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 811 spin_unlock_bh(lock); 812 goto done; 813 } 814 next_normal: 815 ++num; 816 } 817 818 if (r->idiag_states & TCPF_TIME_WAIT) { 819 struct inet_timewait_sock *tw; 820 821 inet_twsk_for_each(tw, node, 822 &head->twchain) { 823 824 if (num < s_num) 825 goto next_dying; 826 if (r->sdiag_family != AF_UNSPEC && 827 tw->tw_family != r->sdiag_family) 828 goto next_dying; 829 if (r->id.idiag_sport != tw->tw_sport && 830 r->id.idiag_sport) 831 goto next_dying; 832 if (r->id.idiag_dport != tw->tw_dport && 833 r->id.idiag_dport) 834 goto next_dying; 835 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) { 836 spin_unlock_bh(lock); 837 goto done; 838 } 839 next_dying: 840 ++num; 841 } 842 } 843 spin_unlock_bh(lock); 844 } 845 846 done: 847 cb->args[1] = i; 848 cb->args[2] = num; 849 unlock: 850 inet_diag_unlock_handler(handler); 851 return skb->len; 852 } 853 854 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 855 { 856 struct nlattr *bc = NULL; 857 int hdrlen = sizeof(struct inet_diag_req); 858 859 if (nlmsg_attrlen(cb->nlh, hdrlen)) 860 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 861 862 return __inet_diag_dump(skb, cb, (struct inet_diag_req *)NLMSG_DATA(cb->nlh), bc); 863 } 864 865 static inline int inet_diag_type2proto(int type) 866 { 867 switch (type) { 868 case TCPDIAG_GETSOCK: 869 return IPPROTO_TCP; 870 case DCCPDIAG_GETSOCK: 871 return IPPROTO_DCCP; 872 default: 873 return 0; 874 } 875 } 876 877 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb) 878 { 879 struct inet_diag_req_compat *rc = NLMSG_DATA(cb->nlh); 880 struct inet_diag_req req; 881 struct nlattr *bc = NULL; 882 int hdrlen = sizeof(struct inet_diag_req_compat); 883 884 req.sdiag_family = AF_UNSPEC; /* compatibility */ 885 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 886 req.idiag_ext = rc->idiag_ext; 887 req.idiag_states = rc->idiag_states; 888 req.id = rc->id; 889 890 if (nlmsg_attrlen(cb->nlh, hdrlen)) 891 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 892 893 return __inet_diag_dump(skb, cb, &req, bc); 894 } 895 896 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 897 const struct nlmsghdr *nlh) 898 { 899 struct inet_diag_req_compat *rc = NLMSG_DATA(nlh); 900 struct inet_diag_req req; 901 902 req.sdiag_family = rc->idiag_family; 903 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 904 req.idiag_ext = rc->idiag_ext; 905 req.idiag_states = rc->idiag_states; 906 req.id = rc->id; 907 908 return inet_diag_get_exact(in_skb, nlh, &req); 909 } 910 911 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 912 { 913 int hdrlen = sizeof(struct inet_diag_req_compat); 914 915 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 916 nlmsg_len(nlh) < hdrlen) 917 return -EINVAL; 918 919 if (nlh->nlmsg_flags & NLM_F_DUMP) { 920 if (nlmsg_attrlen(nlh, hdrlen)) { 921 struct nlattr *attr; 922 923 attr = nlmsg_find_attr(nlh, hdrlen, 924 INET_DIAG_REQ_BYTECODE); 925 if (attr == NULL || 926 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 927 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 928 return -EINVAL; 929 } 930 931 return netlink_dump_start(sock_diag_nlsk, skb, nlh, 932 inet_diag_dump_compat, NULL, 0); 933 } 934 935 return inet_diag_get_exact_compat(skb, nlh); 936 } 937 938 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) 939 { 940 int hdrlen = sizeof(struct inet_diag_req); 941 942 if (nlmsg_len(h) < hdrlen) 943 return -EINVAL; 944 945 if (h->nlmsg_flags & NLM_F_DUMP) { 946 if (nlmsg_attrlen(h, hdrlen)) { 947 struct nlattr *attr; 948 attr = nlmsg_find_attr(h, hdrlen, 949 INET_DIAG_REQ_BYTECODE); 950 if (attr == NULL || 951 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 952 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 953 return -EINVAL; 954 } 955 956 return netlink_dump_start(sock_diag_nlsk, skb, h, 957 inet_diag_dump, NULL, 0); 958 } 959 960 return inet_diag_get_exact(skb, h, (struct inet_diag_req *)NLMSG_DATA(h)); 961 } 962 963 static struct sock_diag_handler inet_diag_handler = { 964 .family = AF_INET, 965 .dump = inet_diag_handler_dump, 966 }; 967 968 static struct sock_diag_handler inet6_diag_handler = { 969 .family = AF_INET6, 970 .dump = inet_diag_handler_dump, 971 }; 972 973 int inet_diag_register(const struct inet_diag_handler *h) 974 { 975 const __u16 type = h->idiag_type; 976 int err = -EINVAL; 977 978 if (type >= IPPROTO_MAX) 979 goto out; 980 981 mutex_lock(&inet_diag_table_mutex); 982 err = -EEXIST; 983 if (inet_diag_table[type] == NULL) { 984 inet_diag_table[type] = h; 985 err = 0; 986 } 987 mutex_unlock(&inet_diag_table_mutex); 988 out: 989 return err; 990 } 991 EXPORT_SYMBOL_GPL(inet_diag_register); 992 993 void inet_diag_unregister(const struct inet_diag_handler *h) 994 { 995 const __u16 type = h->idiag_type; 996 997 if (type >= IPPROTO_MAX) 998 return; 999 1000 mutex_lock(&inet_diag_table_mutex); 1001 inet_diag_table[type] = NULL; 1002 mutex_unlock(&inet_diag_table_mutex); 1003 } 1004 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1005 1006 static int __init inet_diag_init(void) 1007 { 1008 const int inet_diag_table_size = (IPPROTO_MAX * 1009 sizeof(struct inet_diag_handler *)); 1010 int err = -ENOMEM; 1011 1012 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1013 if (!inet_diag_table) 1014 goto out; 1015 1016 err = sock_diag_register(&inet_diag_handler); 1017 if (err) 1018 goto out_free_nl; 1019 1020 err = sock_diag_register(&inet6_diag_handler); 1021 if (err) 1022 goto out_free_inet; 1023 1024 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1025 out: 1026 return err; 1027 1028 out_free_inet: 1029 sock_diag_unregister(&inet_diag_handler); 1030 out_free_nl: 1031 kfree(inet_diag_table); 1032 goto out; 1033 } 1034 1035 static void __exit inet_diag_exit(void) 1036 { 1037 sock_diag_unregister(&inet6_diag_handler); 1038 sock_diag_unregister(&inet_diag_handler); 1039 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1040 kfree(inet_diag_table); 1041 } 1042 1043 module_init(inet_diag_init); 1044 module_exit(inet_diag_exit); 1045 MODULE_LICENSE("GPL"); 1046 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 0); 1047