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/cache.h> 18 #include <linux/init.h> 19 #include <linux/time.h> 20 21 #include <net/icmp.h> 22 #include <net/tcp.h> 23 #include <net/ipv6.h> 24 #include <net/inet_common.h> 25 #include <net/inet_connection_sock.h> 26 #include <net/inet_hashtables.h> 27 #include <net/inet_timewait_sock.h> 28 #include <net/inet6_hashtables.h> 29 #include <net/netlink.h> 30 31 #include <linux/inet.h> 32 #include <linux/stddef.h> 33 34 #include <linux/inet_diag.h> 35 36 static const struct inet_diag_handler **inet_diag_table; 37 38 struct inet_diag_entry { 39 __be32 *saddr; 40 __be32 *daddr; 41 u16 sport; 42 u16 dport; 43 u16 family; 44 u16 userlocks; 45 }; 46 47 static struct sock *idiagnl; 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 type) 55 { 56 if (!inet_diag_table[type]) 57 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, 58 NETLINK_INET_DIAG, type); 59 60 mutex_lock(&inet_diag_table_mutex); 61 if (!inet_diag_table[type]) 62 return ERR_PTR(-ENOENT); 63 64 return inet_diag_table[type]; 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, 75 int ext, 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 87 handler = inet_diag_table[unlh->nlmsg_type]; 88 BUG_ON(handler == NULL); 89 90 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 91 nlh->nlmsg_flags = nlmsg_flags; 92 93 r = NLMSG_DATA(nlh); 94 BUG_ON(sk->sk_state == TCP_TIME_WAIT); 95 96 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) 97 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo)); 98 99 if (ext & (1 << (INET_DIAG_INFO - 1))) 100 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, 101 handler->idiag_info_size); 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->sport; 120 r->id.idiag_dport = inet->dport; 121 r->id.idiag_src[0] = inet->rcv_saddr; 122 r->id.idiag_dst[0] = inet->daddr; 123 124 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 125 if (r->idiag_family == AF_INET6) { 126 struct ipv6_pinfo *np = inet6_sk(sk); 127 128 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 129 &np->rcv_saddr); 130 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 131 &np->daddr); 132 } 133 #endif 134 135 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) 136 137 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 138 r->idiag_timer = 1; 139 r->idiag_retrans = icsk->icsk_retransmits; 140 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 141 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 142 r->idiag_timer = 4; 143 r->idiag_retrans = icsk->icsk_probes_out; 144 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 145 } else if (timer_pending(&sk->sk_timer)) { 146 r->idiag_timer = 2; 147 r->idiag_retrans = icsk->icsk_probes_out; 148 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 149 } else { 150 r->idiag_timer = 0; 151 r->idiag_expires = 0; 152 } 153 #undef EXPIRES_IN_MS 154 155 r->idiag_uid = sock_i_uid(sk); 156 r->idiag_inode = sock_i_ino(sk); 157 158 if (minfo) { 159 minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc); 160 minfo->idiag_wmem = sk->sk_wmem_queued; 161 minfo->idiag_fmem = sk->sk_forward_alloc; 162 minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc); 163 } 164 165 handler->idiag_get_info(sk, r, info); 166 167 if (sk->sk_state < TCP_TIME_WAIT && 168 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 169 icsk->icsk_ca_ops->get_info(sk, ext, skb); 170 171 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 172 return skb->len; 173 174 rtattr_failure: 175 nlmsg_failure: 176 nlmsg_trim(skb, b); 177 return -EMSGSIZE; 178 } 179 180 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 181 struct sk_buff *skb, int ext, u32 pid, 182 u32 seq, u16 nlmsg_flags, 183 const struct nlmsghdr *unlh) 184 { 185 long tmo; 186 struct inet_diag_msg *r; 187 const unsigned char *previous_tail = skb_tail_pointer(skb); 188 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq, 189 unlh->nlmsg_type, sizeof(*r)); 190 191 r = NLMSG_DATA(nlh); 192 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 193 194 nlh->nlmsg_flags = nlmsg_flags; 195 196 tmo = tw->tw_ttd - jiffies; 197 if (tmo < 0) 198 tmo = 0; 199 200 r->idiag_family = tw->tw_family; 201 r->idiag_state = tw->tw_state; 202 r->idiag_timer = 0; 203 r->idiag_retrans = 0; 204 r->id.idiag_if = tw->tw_bound_dev_if; 205 r->id.idiag_cookie[0] = (u32)(unsigned long)tw; 206 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1); 207 r->id.idiag_sport = tw->tw_sport; 208 r->id.idiag_dport = tw->tw_dport; 209 r->id.idiag_src[0] = tw->tw_rcv_saddr; 210 r->id.idiag_dst[0] = tw->tw_daddr; 211 r->idiag_state = tw->tw_substate; 212 r->idiag_timer = 3; 213 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); 214 r->idiag_rqueue = 0; 215 r->idiag_wqueue = 0; 216 r->idiag_uid = 0; 217 r->idiag_inode = 0; 218 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 219 if (tw->tw_family == AF_INET6) { 220 const struct inet6_timewait_sock *tw6 = 221 inet6_twsk((struct sock *)tw); 222 223 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 224 &tw6->tw_v6_rcv_saddr); 225 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 226 &tw6->tw_v6_daddr); 227 } 228 #endif 229 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; 230 return skb->len; 231 nlmsg_failure: 232 nlmsg_trim(skb, previous_tail); 233 return -EMSGSIZE; 234 } 235 236 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 237 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 238 const struct nlmsghdr *unlh) 239 { 240 if (sk->sk_state == TCP_TIME_WAIT) 241 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 242 skb, ext, pid, seq, nlmsg_flags, 243 unlh); 244 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh); 245 } 246 247 static int inet_diag_get_exact(struct sk_buff *in_skb, 248 const struct nlmsghdr *nlh) 249 { 250 int err; 251 struct sock *sk; 252 struct inet_diag_req *req = NLMSG_DATA(nlh); 253 struct sk_buff *rep; 254 struct inet_hashinfo *hashinfo; 255 const struct inet_diag_handler *handler; 256 257 handler = inet_diag_lock_handler(nlh->nlmsg_type); 258 if (IS_ERR(handler)) { 259 err = PTR_ERR(handler); 260 goto unlock; 261 } 262 263 hashinfo = handler->idiag_hashinfo; 264 err = -EINVAL; 265 266 if (req->idiag_family == AF_INET) { 267 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], 268 req->id.idiag_dport, req->id.idiag_src[0], 269 req->id.idiag_sport, req->id.idiag_if); 270 } 271 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 272 else if (req->idiag_family == AF_INET6) { 273 sk = inet6_lookup(&init_net, hashinfo, 274 (struct in6_addr *)req->id.idiag_dst, 275 req->id.idiag_dport, 276 (struct in6_addr *)req->id.idiag_src, 277 req->id.idiag_sport, 278 req->id.idiag_if); 279 } 280 #endif 281 else { 282 goto unlock; 283 } 284 285 err = -ENOENT; 286 if (sk == NULL) 287 goto unlock; 288 289 err = -ESTALE; 290 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || 291 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && 292 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || 293 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) 294 goto out; 295 296 err = -ENOMEM; 297 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 298 sizeof(struct inet_diag_meminfo) + 299 handler->idiag_info_size + 64)), 300 GFP_KERNEL); 301 if (!rep) 302 goto out; 303 304 err = sk_diag_fill(sk, rep, req->idiag_ext, 305 NETLINK_CB(in_skb).pid, 306 nlh->nlmsg_seq, 0, nlh); 307 if (err < 0) { 308 WARN_ON(err == -EMSGSIZE); 309 kfree_skb(rep); 310 goto out; 311 } 312 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid, 313 MSG_DONTWAIT); 314 if (err > 0) 315 err = 0; 316 317 out: 318 if (sk) { 319 if (sk->sk_state == TCP_TIME_WAIT) 320 inet_twsk_put((struct inet_timewait_sock *)sk); 321 else 322 sock_put(sk); 323 } 324 unlock: 325 inet_diag_unlock_handler(handler); 326 return err; 327 } 328 329 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 330 { 331 int words = bits >> 5; 332 333 bits &= 0x1f; 334 335 if (words) { 336 if (memcmp(a1, a2, words << 2)) 337 return 0; 338 } 339 if (bits) { 340 __be32 w1, w2; 341 __be32 mask; 342 343 w1 = a1[words]; 344 w2 = a2[words]; 345 346 mask = htonl((0xffffffff) << (32 - bits)); 347 348 if ((w1 ^ w2) & mask) 349 return 0; 350 } 351 352 return 1; 353 } 354 355 356 static int inet_diag_bc_run(const void *bc, int len, 357 const struct inet_diag_entry *entry) 358 { 359 while (len > 0) { 360 int yes = 1; 361 const struct inet_diag_bc_op *op = bc; 362 363 switch (op->code) { 364 case INET_DIAG_BC_NOP: 365 break; 366 case INET_DIAG_BC_JMP: 367 yes = 0; 368 break; 369 case INET_DIAG_BC_S_GE: 370 yes = entry->sport >= op[1].no; 371 break; 372 case INET_DIAG_BC_S_LE: 373 yes = entry->dport <= op[1].no; 374 break; 375 case INET_DIAG_BC_D_GE: 376 yes = entry->dport >= op[1].no; 377 break; 378 case INET_DIAG_BC_D_LE: 379 yes = entry->dport <= op[1].no; 380 break; 381 case INET_DIAG_BC_AUTO: 382 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 383 break; 384 case INET_DIAG_BC_S_COND: 385 case INET_DIAG_BC_D_COND: { 386 struct inet_diag_hostcond *cond; 387 __be32 *addr; 388 389 cond = (struct inet_diag_hostcond *)(op + 1); 390 if (cond->port != -1 && 391 cond->port != (op->code == INET_DIAG_BC_S_COND ? 392 entry->sport : entry->dport)) { 393 yes = 0; 394 break; 395 } 396 397 if (cond->prefix_len == 0) 398 break; 399 400 if (op->code == INET_DIAG_BC_S_COND) 401 addr = entry->saddr; 402 else 403 addr = entry->daddr; 404 405 if (bitstring_match(addr, cond->addr, 406 cond->prefix_len)) 407 break; 408 if (entry->family == AF_INET6 && 409 cond->family == AF_INET) { 410 if (addr[0] == 0 && addr[1] == 0 && 411 addr[2] == htonl(0xffff) && 412 bitstring_match(addr + 3, cond->addr, 413 cond->prefix_len)) 414 break; 415 } 416 yes = 0; 417 break; 418 } 419 } 420 421 if (yes) { 422 len -= op->yes; 423 bc += op->yes; 424 } else { 425 len -= op->no; 426 bc += op->no; 427 } 428 } 429 return (len == 0); 430 } 431 432 static int valid_cc(const void *bc, int len, int cc) 433 { 434 while (len >= 0) { 435 const struct inet_diag_bc_op *op = bc; 436 437 if (cc > len) 438 return 0; 439 if (cc == len) 440 return 1; 441 if (op->yes < 4) 442 return 0; 443 len -= op->yes; 444 bc += op->yes; 445 } 446 return 0; 447 } 448 449 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 450 { 451 const unsigned char *bc = bytecode; 452 int len = bytecode_len; 453 454 while (len > 0) { 455 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc; 456 457 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 458 switch (op->code) { 459 case INET_DIAG_BC_AUTO: 460 case INET_DIAG_BC_S_COND: 461 case INET_DIAG_BC_D_COND: 462 case INET_DIAG_BC_S_GE: 463 case INET_DIAG_BC_S_LE: 464 case INET_DIAG_BC_D_GE: 465 case INET_DIAG_BC_D_LE: 466 if (op->yes < 4 || op->yes > len + 4) 467 return -EINVAL; 468 case INET_DIAG_BC_JMP: 469 if (op->no < 4 || op->no > len + 4) 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 if (op->yes < 4 || op->yes > len + 4) 477 return -EINVAL; 478 break; 479 default: 480 return -EINVAL; 481 } 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 { 492 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 493 494 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 495 struct inet_diag_entry entry; 496 struct rtattr *bc = (struct rtattr *)(r + 1); 497 struct inet_sock *inet = inet_sk(sk); 498 499 entry.family = sk->sk_family; 500 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 501 if (entry.family == AF_INET6) { 502 struct ipv6_pinfo *np = inet6_sk(sk); 503 504 entry.saddr = np->rcv_saddr.s6_addr32; 505 entry.daddr = np->daddr.s6_addr32; 506 } else 507 #endif 508 { 509 entry.saddr = &inet->rcv_saddr; 510 entry.daddr = &inet->daddr; 511 } 512 entry.sport = inet->num; 513 entry.dport = ntohs(inet->dport); 514 entry.userlocks = sk->sk_userlocks; 515 516 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) 517 return 0; 518 } 519 520 return inet_csk_diag_fill(sk, skb, r->idiag_ext, 521 NETLINK_CB(cb->skb).pid, 522 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 523 } 524 525 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 526 struct sk_buff *skb, 527 struct netlink_callback *cb) 528 { 529 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 530 531 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 532 struct inet_diag_entry entry; 533 struct rtattr *bc = (struct rtattr *)(r + 1); 534 535 entry.family = tw->tw_family; 536 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 537 if (tw->tw_family == AF_INET6) { 538 struct inet6_timewait_sock *tw6 = 539 inet6_twsk((struct sock *)tw); 540 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 541 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 542 } else 543 #endif 544 { 545 entry.saddr = &tw->tw_rcv_saddr; 546 entry.daddr = &tw->tw_daddr; 547 } 548 entry.sport = tw->tw_num; 549 entry.dport = ntohs(tw->tw_dport); 550 entry.userlocks = 0; 551 552 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) 553 return 0; 554 } 555 556 return inet_twsk_diag_fill(tw, skb, r->idiag_ext, 557 NETLINK_CB(cb->skb).pid, 558 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 559 } 560 561 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 562 struct request_sock *req, u32 pid, u32 seq, 563 const struct nlmsghdr *unlh) 564 { 565 const struct inet_request_sock *ireq = inet_rsk(req); 566 struct inet_sock *inet = inet_sk(sk); 567 unsigned char *b = skb_tail_pointer(skb); 568 struct inet_diag_msg *r; 569 struct nlmsghdr *nlh; 570 long tmo; 571 572 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 573 nlh->nlmsg_flags = NLM_F_MULTI; 574 r = NLMSG_DATA(nlh); 575 576 r->idiag_family = sk->sk_family; 577 r->idiag_state = TCP_SYN_RECV; 578 r->idiag_timer = 1; 579 r->idiag_retrans = req->retrans; 580 581 r->id.idiag_if = sk->sk_bound_dev_if; 582 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 583 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 584 585 tmo = req->expires - jiffies; 586 if (tmo < 0) 587 tmo = 0; 588 589 r->id.idiag_sport = inet->sport; 590 r->id.idiag_dport = ireq->rmt_port; 591 r->id.idiag_src[0] = ireq->loc_addr; 592 r->id.idiag_dst[0] = ireq->rmt_addr; 593 r->idiag_expires = jiffies_to_msecs(tmo); 594 r->idiag_rqueue = 0; 595 r->idiag_wqueue = 0; 596 r->idiag_uid = sock_i_uid(sk); 597 r->idiag_inode = 0; 598 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 599 if (r->idiag_family == AF_INET6) { 600 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 601 &inet6_rsk(req)->loc_addr); 602 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 603 &inet6_rsk(req)->rmt_addr); 604 } 605 #endif 606 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 607 608 return skb->len; 609 610 nlmsg_failure: 611 nlmsg_trim(skb, b); 612 return -1; 613 } 614 615 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 616 struct netlink_callback *cb) 617 { 618 struct inet_diag_entry entry; 619 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 620 struct inet_connection_sock *icsk = inet_csk(sk); 621 struct listen_sock *lopt; 622 struct rtattr *bc = NULL; 623 struct inet_sock *inet = inet_sk(sk); 624 int j, s_j; 625 int reqnum, s_reqnum; 626 int err = 0; 627 628 s_j = cb->args[3]; 629 s_reqnum = cb->args[4]; 630 631 if (s_j > 0) 632 s_j--; 633 634 entry.family = sk->sk_family; 635 636 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 637 638 lopt = icsk->icsk_accept_queue.listen_opt; 639 if (!lopt || !lopt->qlen) 640 goto out; 641 642 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 643 bc = (struct rtattr *)(r + 1); 644 entry.sport = inet->num; 645 entry.userlocks = sk->sk_userlocks; 646 } 647 648 for (j = s_j; j < lopt->nr_table_entries; j++) { 649 struct request_sock *req, *head = lopt->syn_table[j]; 650 651 reqnum = 0; 652 for (req = head; req; reqnum++, req = req->dl_next) { 653 struct inet_request_sock *ireq = inet_rsk(req); 654 655 if (reqnum < s_reqnum) 656 continue; 657 if (r->id.idiag_dport != ireq->rmt_port && 658 r->id.idiag_dport) 659 continue; 660 661 if (bc) { 662 entry.saddr = 663 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 664 (entry.family == AF_INET6) ? 665 inet6_rsk(req)->loc_addr.s6_addr32 : 666 #endif 667 &ireq->loc_addr; 668 entry.daddr = 669 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 670 (entry.family == AF_INET6) ? 671 inet6_rsk(req)->rmt_addr.s6_addr32 : 672 #endif 673 &ireq->rmt_addr; 674 entry.dport = ntohs(ireq->rmt_port); 675 676 if (!inet_diag_bc_run(RTA_DATA(bc), 677 RTA_PAYLOAD(bc), &entry)) 678 continue; 679 } 680 681 err = inet_diag_fill_req(skb, sk, req, 682 NETLINK_CB(cb->skb).pid, 683 cb->nlh->nlmsg_seq, cb->nlh); 684 if (err < 0) { 685 cb->args[3] = j + 1; 686 cb->args[4] = reqnum; 687 goto out; 688 } 689 } 690 691 s_reqnum = 0; 692 } 693 694 out: 695 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 696 697 return err; 698 } 699 700 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 701 { 702 int i, num; 703 int s_i, s_num; 704 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 705 const struct inet_diag_handler *handler; 706 struct inet_hashinfo *hashinfo; 707 708 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type); 709 if (IS_ERR(handler)) 710 goto unlock; 711 712 hashinfo = handler->idiag_hashinfo; 713 714 s_i = cb->args[1]; 715 s_num = num = cb->args[2]; 716 717 if (cb->args[0] == 0) { 718 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 719 goto skip_listen_ht; 720 721 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 722 struct sock *sk; 723 struct hlist_nulls_node *node; 724 struct inet_listen_hashbucket *ilb; 725 726 num = 0; 727 ilb = &hashinfo->listening_hash[i]; 728 spin_lock_bh(&ilb->lock); 729 sk_nulls_for_each(sk, node, &ilb->head) { 730 struct inet_sock *inet = inet_sk(sk); 731 732 if (num < s_num) { 733 num++; 734 continue; 735 } 736 737 if (r->id.idiag_sport != inet->sport && 738 r->id.idiag_sport) 739 goto next_listen; 740 741 if (!(r->idiag_states & TCPF_LISTEN) || 742 r->id.idiag_dport || 743 cb->args[3] > 0) 744 goto syn_recv; 745 746 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 747 spin_unlock_bh(&ilb->lock); 748 goto done; 749 } 750 751 syn_recv: 752 if (!(r->idiag_states & TCPF_SYN_RECV)) 753 goto next_listen; 754 755 if (inet_diag_dump_reqs(skb, sk, cb) < 0) { 756 spin_unlock_bh(&ilb->lock); 757 goto done; 758 } 759 760 next_listen: 761 cb->args[3] = 0; 762 cb->args[4] = 0; 763 ++num; 764 } 765 spin_unlock_bh(&ilb->lock); 766 767 s_num = 0; 768 cb->args[3] = 0; 769 cb->args[4] = 0; 770 } 771 skip_listen_ht: 772 cb->args[0] = 1; 773 s_i = num = s_num = 0; 774 } 775 776 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 777 goto unlock; 778 779 for (i = s_i; i < hashinfo->ehash_size; i++) { 780 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 781 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 782 struct sock *sk; 783 struct hlist_nulls_node *node; 784 785 num = 0; 786 787 if (hlist_nulls_empty(&head->chain) && 788 hlist_nulls_empty(&head->twchain)) 789 continue; 790 791 if (i > s_i) 792 s_num = 0; 793 794 spin_lock_bh(lock); 795 sk_nulls_for_each(sk, node, &head->chain) { 796 struct inet_sock *inet = inet_sk(sk); 797 798 if (num < s_num) 799 goto next_normal; 800 if (!(r->idiag_states & (1 << sk->sk_state))) 801 goto next_normal; 802 if (r->id.idiag_sport != inet->sport && 803 r->id.idiag_sport) 804 goto next_normal; 805 if (r->id.idiag_dport != inet->dport && 806 r->id.idiag_dport) 807 goto next_normal; 808 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 809 spin_unlock_bh(lock); 810 goto done; 811 } 812 next_normal: 813 ++num; 814 } 815 816 if (r->idiag_states & TCPF_TIME_WAIT) { 817 struct inet_timewait_sock *tw; 818 819 inet_twsk_for_each(tw, node, 820 &head->twchain) { 821 822 if (num < s_num) 823 goto next_dying; 824 if (r->id.idiag_sport != tw->tw_sport && 825 r->id.idiag_sport) 826 goto next_dying; 827 if (r->id.idiag_dport != tw->tw_dport && 828 r->id.idiag_dport) 829 goto next_dying; 830 if (inet_twsk_diag_dump(tw, skb, cb) < 0) { 831 spin_unlock_bh(lock); 832 goto done; 833 } 834 next_dying: 835 ++num; 836 } 837 } 838 spin_unlock_bh(lock); 839 } 840 841 done: 842 cb->args[1] = i; 843 cb->args[2] = num; 844 unlock: 845 inet_diag_unlock_handler(handler); 846 return skb->len; 847 } 848 849 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 850 { 851 int hdrlen = sizeof(struct inet_diag_req); 852 853 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 854 nlmsg_len(nlh) < hdrlen) 855 return -EINVAL; 856 857 if (nlh->nlmsg_flags & NLM_F_DUMP) { 858 if (nlmsg_attrlen(nlh, hdrlen)) { 859 struct nlattr *attr; 860 861 attr = nlmsg_find_attr(nlh, hdrlen, 862 INET_DIAG_REQ_BYTECODE); 863 if (attr == NULL || 864 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 865 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 866 return -EINVAL; 867 } 868 869 return netlink_dump_start(idiagnl, skb, nlh, 870 inet_diag_dump, NULL); 871 } 872 873 return inet_diag_get_exact(skb, nlh); 874 } 875 876 static DEFINE_MUTEX(inet_diag_mutex); 877 878 static void inet_diag_rcv(struct sk_buff *skb) 879 { 880 mutex_lock(&inet_diag_mutex); 881 netlink_rcv_skb(skb, &inet_diag_rcv_msg); 882 mutex_unlock(&inet_diag_mutex); 883 } 884 885 int inet_diag_register(const struct inet_diag_handler *h) 886 { 887 const __u16 type = h->idiag_type; 888 int err = -EINVAL; 889 890 if (type >= INET_DIAG_GETSOCK_MAX) 891 goto out; 892 893 mutex_lock(&inet_diag_table_mutex); 894 err = -EEXIST; 895 if (inet_diag_table[type] == NULL) { 896 inet_diag_table[type] = h; 897 err = 0; 898 } 899 mutex_unlock(&inet_diag_table_mutex); 900 out: 901 return err; 902 } 903 EXPORT_SYMBOL_GPL(inet_diag_register); 904 905 void inet_diag_unregister(const struct inet_diag_handler *h) 906 { 907 const __u16 type = h->idiag_type; 908 909 if (type >= INET_DIAG_GETSOCK_MAX) 910 return; 911 912 mutex_lock(&inet_diag_table_mutex); 913 inet_diag_table[type] = NULL; 914 mutex_unlock(&inet_diag_table_mutex); 915 } 916 EXPORT_SYMBOL_GPL(inet_diag_unregister); 917 918 static int __init inet_diag_init(void) 919 { 920 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX * 921 sizeof(struct inet_diag_handler *)); 922 int err = -ENOMEM; 923 924 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 925 if (!inet_diag_table) 926 goto out; 927 928 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0, 929 inet_diag_rcv, NULL, THIS_MODULE); 930 if (idiagnl == NULL) 931 goto out_free_table; 932 err = 0; 933 out: 934 return err; 935 out_free_table: 936 kfree(inet_diag_table); 937 goto out; 938 } 939 940 static void __exit inet_diag_exit(void) 941 { 942 netlink_kernel_release(idiagnl); 943 kfree(inet_diag_table); 944 } 945 946 module_init(inet_diag_init); 947 module_exit(inet_diag_exit); 948 MODULE_LICENSE("GPL"); 949 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG); 950