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 if ((ext & (1 << (INET_DIAG_TOS - 1))) && (sk->sk_family != AF_INET6)) 112 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos); 113 114 r->idiag_family = sk->sk_family; 115 r->idiag_state = sk->sk_state; 116 r->idiag_timer = 0; 117 r->idiag_retrans = 0; 118 119 r->id.idiag_if = sk->sk_bound_dev_if; 120 r->id.idiag_cookie[0] = (u32)(unsigned long)sk; 121 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); 122 123 r->id.idiag_sport = inet->inet_sport; 124 r->id.idiag_dport = inet->inet_dport; 125 r->id.idiag_src[0] = inet->inet_rcv_saddr; 126 r->id.idiag_dst[0] = inet->inet_daddr; 127 128 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 129 if (r->idiag_family == AF_INET6) { 130 const struct ipv6_pinfo *np = inet6_sk(sk); 131 132 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 133 &np->rcv_saddr); 134 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 135 &np->daddr); 136 if (ext & (1 << (INET_DIAG_TOS - 1))) 137 RTA_PUT_U8(skb, INET_DIAG_TOS, 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, int ext, u32 pid, 188 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 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 228 &tw6->tw_v6_rcv_saddr); 229 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 230 &tw6->tw_v6_daddr); 231 } 232 #endif 233 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; 234 return skb->len; 235 nlmsg_failure: 236 nlmsg_trim(skb, previous_tail); 237 return -EMSGSIZE; 238 } 239 240 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 241 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 242 const struct nlmsghdr *unlh) 243 { 244 if (sk->sk_state == TCP_TIME_WAIT) 245 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 246 skb, ext, pid, seq, nlmsg_flags, 247 unlh); 248 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh); 249 } 250 251 static int inet_diag_get_exact(struct sk_buff *in_skb, 252 const struct nlmsghdr *nlh) 253 { 254 int err; 255 struct sock *sk; 256 struct inet_diag_req *req = NLMSG_DATA(nlh); 257 struct sk_buff *rep; 258 struct inet_hashinfo *hashinfo; 259 const struct inet_diag_handler *handler; 260 261 handler = inet_diag_lock_handler(nlh->nlmsg_type); 262 if (IS_ERR(handler)) { 263 err = PTR_ERR(handler); 264 goto unlock; 265 } 266 267 hashinfo = handler->idiag_hashinfo; 268 err = -EINVAL; 269 270 if (req->idiag_family == AF_INET) { 271 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], 272 req->id.idiag_dport, req->id.idiag_src[0], 273 req->id.idiag_sport, req->id.idiag_if); 274 } 275 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 276 else if (req->idiag_family == AF_INET6) { 277 sk = inet6_lookup(&init_net, hashinfo, 278 (struct in6_addr *)req->id.idiag_dst, 279 req->id.idiag_dport, 280 (struct in6_addr *)req->id.idiag_src, 281 req->id.idiag_sport, 282 req->id.idiag_if); 283 } 284 #endif 285 else { 286 goto unlock; 287 } 288 289 err = -ENOENT; 290 if (sk == NULL) 291 goto unlock; 292 293 err = -ESTALE; 294 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || 295 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && 296 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || 297 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) 298 goto out; 299 300 err = -ENOMEM; 301 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 302 sizeof(struct inet_diag_meminfo) + 303 handler->idiag_info_size + 64)), 304 GFP_KERNEL); 305 if (!rep) 306 goto out; 307 308 err = sk_diag_fill(sk, rep, req->idiag_ext, 309 NETLINK_CB(in_skb).pid, 310 nlh->nlmsg_seq, 0, nlh); 311 if (err < 0) { 312 WARN_ON(err == -EMSGSIZE); 313 kfree_skb(rep); 314 goto out; 315 } 316 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid, 317 MSG_DONTWAIT); 318 if (err > 0) 319 err = 0; 320 321 out: 322 if (sk) { 323 if (sk->sk_state == TCP_TIME_WAIT) 324 inet_twsk_put((struct inet_timewait_sock *)sk); 325 else 326 sock_put(sk); 327 } 328 unlock: 329 inet_diag_unlock_handler(handler); 330 return err; 331 } 332 333 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 334 { 335 int words = bits >> 5; 336 337 bits &= 0x1f; 338 339 if (words) { 340 if (memcmp(a1, a2, words << 2)) 341 return 0; 342 } 343 if (bits) { 344 __be32 w1, w2; 345 __be32 mask; 346 347 w1 = a1[words]; 348 w2 = a2[words]; 349 350 mask = htonl((0xffffffff) << (32 - bits)); 351 352 if ((w1 ^ w2) & mask) 353 return 0; 354 } 355 356 return 1; 357 } 358 359 360 static int inet_diag_bc_run(const void *bc, int len, 361 const struct inet_diag_entry *entry) 362 { 363 while (len > 0) { 364 int yes = 1; 365 const struct inet_diag_bc_op *op = bc; 366 367 switch (op->code) { 368 case INET_DIAG_BC_NOP: 369 break; 370 case INET_DIAG_BC_JMP: 371 yes = 0; 372 break; 373 case INET_DIAG_BC_S_GE: 374 yes = entry->sport >= op[1].no; 375 break; 376 case INET_DIAG_BC_S_LE: 377 yes = entry->sport <= op[1].no; 378 break; 379 case INET_DIAG_BC_D_GE: 380 yes = entry->dport >= op[1].no; 381 break; 382 case INET_DIAG_BC_D_LE: 383 yes = entry->dport <= op[1].no; 384 break; 385 case INET_DIAG_BC_AUTO: 386 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 387 break; 388 case INET_DIAG_BC_S_COND: 389 case INET_DIAG_BC_D_COND: { 390 struct inet_diag_hostcond *cond; 391 __be32 *addr; 392 393 cond = (struct inet_diag_hostcond *)(op + 1); 394 if (cond->port != -1 && 395 cond->port != (op->code == INET_DIAG_BC_S_COND ? 396 entry->sport : entry->dport)) { 397 yes = 0; 398 break; 399 } 400 401 if (cond->prefix_len == 0) 402 break; 403 404 if (op->code == INET_DIAG_BC_S_COND) 405 addr = entry->saddr; 406 else 407 addr = entry->daddr; 408 409 if (bitstring_match(addr, cond->addr, 410 cond->prefix_len)) 411 break; 412 if (entry->family == AF_INET6 && 413 cond->family == AF_INET) { 414 if (addr[0] == 0 && addr[1] == 0 && 415 addr[2] == htonl(0xffff) && 416 bitstring_match(addr + 3, cond->addr, 417 cond->prefix_len)) 418 break; 419 } 420 yes = 0; 421 break; 422 } 423 } 424 425 if (yes) { 426 len -= op->yes; 427 bc += op->yes; 428 } else { 429 len -= op->no; 430 bc += op->no; 431 } 432 } 433 return len == 0; 434 } 435 436 static int valid_cc(const void *bc, int len, int cc) 437 { 438 while (len >= 0) { 439 const struct inet_diag_bc_op *op = bc; 440 441 if (cc > len) 442 return 0; 443 if (cc == len) 444 return 1; 445 if (op->yes < 4 || op->yes & 3) 446 return 0; 447 len -= op->yes; 448 bc += op->yes; 449 } 450 return 0; 451 } 452 453 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 454 { 455 const void *bc = bytecode; 456 int len = bytecode_len; 457 458 while (len > 0) { 459 const struct inet_diag_bc_op *op = bc; 460 461 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 462 switch (op->code) { 463 case INET_DIAG_BC_AUTO: 464 case INET_DIAG_BC_S_COND: 465 case INET_DIAG_BC_D_COND: 466 case INET_DIAG_BC_S_GE: 467 case INET_DIAG_BC_S_LE: 468 case INET_DIAG_BC_D_GE: 469 case INET_DIAG_BC_D_LE: 470 case INET_DIAG_BC_JMP: 471 if (op->no < 4 || op->no > len + 4 || op->no & 3) 472 return -EINVAL; 473 if (op->no < len && 474 !valid_cc(bytecode, bytecode_len, len - op->no)) 475 return -EINVAL; 476 break; 477 case INET_DIAG_BC_NOP: 478 break; 479 default: 480 return -EINVAL; 481 } 482 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3) 483 return -EINVAL; 484 bc += op->yes; 485 len -= op->yes; 486 } 487 return len == 0 ? 0 : -EINVAL; 488 } 489 490 static int inet_csk_diag_dump(struct sock *sk, 491 struct sk_buff *skb, 492 struct netlink_callback *cb) 493 { 494 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 495 496 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) { 497 struct inet_diag_entry entry; 498 const struct nlattr *bc = nlmsg_find_attr(cb->nlh, 499 sizeof(*r), 500 INET_DIAG_REQ_BYTECODE); 501 struct inet_sock *inet = inet_sk(sk); 502 503 entry.family = sk->sk_family; 504 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 505 if (entry.family == AF_INET6) { 506 struct ipv6_pinfo *np = inet6_sk(sk); 507 508 entry.saddr = np->rcv_saddr.s6_addr32; 509 entry.daddr = np->daddr.s6_addr32; 510 } else 511 #endif 512 { 513 entry.saddr = &inet->inet_rcv_saddr; 514 entry.daddr = &inet->inet_daddr; 515 } 516 entry.sport = inet->inet_num; 517 entry.dport = ntohs(inet->inet_dport); 518 entry.userlocks = sk->sk_userlocks; 519 520 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry)) 521 return 0; 522 } 523 524 return inet_csk_diag_fill(sk, skb, r->idiag_ext, 525 NETLINK_CB(cb->skb).pid, 526 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 527 } 528 529 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 530 struct sk_buff *skb, 531 struct netlink_callback *cb) 532 { 533 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 534 535 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) { 536 struct inet_diag_entry entry; 537 const struct nlattr *bc = nlmsg_find_attr(cb->nlh, 538 sizeof(*r), 539 INET_DIAG_REQ_BYTECODE); 540 541 entry.family = tw->tw_family; 542 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 543 if (tw->tw_family == AF_INET6) { 544 struct inet6_timewait_sock *tw6 = 545 inet6_twsk((struct sock *)tw); 546 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 547 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 548 } else 549 #endif 550 { 551 entry.saddr = &tw->tw_rcv_saddr; 552 entry.daddr = &tw->tw_daddr; 553 } 554 entry.sport = tw->tw_num; 555 entry.dport = ntohs(tw->tw_dport); 556 entry.userlocks = 0; 557 558 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry)) 559 return 0; 560 } 561 562 return inet_twsk_diag_fill(tw, skb, r->idiag_ext, 563 NETLINK_CB(cb->skb).pid, 564 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 565 } 566 567 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 568 struct request_sock *req, u32 pid, u32 seq, 569 const struct nlmsghdr *unlh) 570 { 571 const struct inet_request_sock *ireq = inet_rsk(req); 572 struct inet_sock *inet = inet_sk(sk); 573 unsigned char *b = skb_tail_pointer(skb); 574 struct inet_diag_msg *r; 575 struct nlmsghdr *nlh; 576 long tmo; 577 578 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 579 nlh->nlmsg_flags = NLM_F_MULTI; 580 r = NLMSG_DATA(nlh); 581 582 r->idiag_family = sk->sk_family; 583 r->idiag_state = TCP_SYN_RECV; 584 r->idiag_timer = 1; 585 r->idiag_retrans = req->retrans; 586 587 r->id.idiag_if = sk->sk_bound_dev_if; 588 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 589 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 590 591 tmo = req->expires - jiffies; 592 if (tmo < 0) 593 tmo = 0; 594 595 r->id.idiag_sport = inet->inet_sport; 596 r->id.idiag_dport = ireq->rmt_port; 597 r->id.idiag_src[0] = ireq->loc_addr; 598 r->id.idiag_dst[0] = ireq->rmt_addr; 599 r->idiag_expires = jiffies_to_msecs(tmo); 600 r->idiag_rqueue = 0; 601 r->idiag_wqueue = 0; 602 r->idiag_uid = sock_i_uid(sk); 603 r->idiag_inode = 0; 604 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 605 if (r->idiag_family == AF_INET6) { 606 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 607 &inet6_rsk(req)->loc_addr); 608 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 609 &inet6_rsk(req)->rmt_addr); 610 } 611 #endif 612 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 613 614 return skb->len; 615 616 nlmsg_failure: 617 nlmsg_trim(skb, b); 618 return -1; 619 } 620 621 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 622 struct netlink_callback *cb) 623 { 624 struct inet_diag_entry entry; 625 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 626 struct inet_connection_sock *icsk = inet_csk(sk); 627 struct listen_sock *lopt; 628 const struct nlattr *bc = NULL; 629 struct inet_sock *inet = inet_sk(sk); 630 int j, s_j; 631 int reqnum, s_reqnum; 632 int err = 0; 633 634 s_j = cb->args[3]; 635 s_reqnum = cb->args[4]; 636 637 if (s_j > 0) 638 s_j--; 639 640 entry.family = sk->sk_family; 641 642 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 643 644 lopt = icsk->icsk_accept_queue.listen_opt; 645 if (!lopt || !lopt->qlen) 646 goto out; 647 648 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) { 649 bc = nlmsg_find_attr(cb->nlh, sizeof(*r), 650 INET_DIAG_REQ_BYTECODE); 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(nla_data(bc), 684 nla_len(bc), &entry)) 685 continue; 686 } 687 688 err = inet_diag_fill_req(skb, sk, req, 689 NETLINK_CB(cb->skb).pid, 690 cb->nlh->nlmsg_seq, cb->nlh); 691 if (err < 0) { 692 cb->args[3] = j + 1; 693 cb->args[4] = reqnum; 694 goto out; 695 } 696 } 697 698 s_reqnum = 0; 699 } 700 701 out: 702 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 703 704 return err; 705 } 706 707 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 708 { 709 int i, num; 710 int s_i, s_num; 711 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 712 const struct inet_diag_handler *handler; 713 struct inet_hashinfo *hashinfo; 714 715 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type); 716 if (IS_ERR(handler)) 717 goto unlock; 718 719 hashinfo = handler->idiag_hashinfo; 720 721 s_i = cb->args[1]; 722 s_num = num = cb->args[2]; 723 724 if (cb->args[0] == 0) { 725 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 726 goto skip_listen_ht; 727 728 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 729 struct sock *sk; 730 struct hlist_nulls_node *node; 731 struct inet_listen_hashbucket *ilb; 732 733 num = 0; 734 ilb = &hashinfo->listening_hash[i]; 735 spin_lock_bh(&ilb->lock); 736 sk_nulls_for_each(sk, node, &ilb->head) { 737 struct inet_sock *inet = inet_sk(sk); 738 739 if (num < s_num) { 740 num++; 741 continue; 742 } 743 744 if (r->id.idiag_sport != inet->inet_sport && 745 r->id.idiag_sport) 746 goto next_listen; 747 748 if (!(r->idiag_states & TCPF_LISTEN) || 749 r->id.idiag_dport || 750 cb->args[3] > 0) 751 goto syn_recv; 752 753 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 754 spin_unlock_bh(&ilb->lock); 755 goto done; 756 } 757 758 syn_recv: 759 if (!(r->idiag_states & TCPF_SYN_RECV)) 760 goto next_listen; 761 762 if (inet_diag_dump_reqs(skb, sk, cb) < 0) { 763 spin_unlock_bh(&ilb->lock); 764 goto done; 765 } 766 767 next_listen: 768 cb->args[3] = 0; 769 cb->args[4] = 0; 770 ++num; 771 } 772 spin_unlock_bh(&ilb->lock); 773 774 s_num = 0; 775 cb->args[3] = 0; 776 cb->args[4] = 0; 777 } 778 skip_listen_ht: 779 cb->args[0] = 1; 780 s_i = num = s_num = 0; 781 } 782 783 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 784 goto unlock; 785 786 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 787 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 788 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 789 struct sock *sk; 790 struct hlist_nulls_node *node; 791 792 num = 0; 793 794 if (hlist_nulls_empty(&head->chain) && 795 hlist_nulls_empty(&head->twchain)) 796 continue; 797 798 if (i > s_i) 799 s_num = 0; 800 801 spin_lock_bh(lock); 802 sk_nulls_for_each(sk, node, &head->chain) { 803 struct inet_sock *inet = inet_sk(sk); 804 805 if (num < s_num) 806 goto next_normal; 807 if (!(r->idiag_states & (1 << sk->sk_state))) 808 goto next_normal; 809 if (r->id.idiag_sport != inet->inet_sport && 810 r->id.idiag_sport) 811 goto next_normal; 812 if (r->id.idiag_dport != inet->inet_dport && 813 r->id.idiag_dport) 814 goto next_normal; 815 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 816 spin_unlock_bh(lock); 817 goto done; 818 } 819 next_normal: 820 ++num; 821 } 822 823 if (r->idiag_states & TCPF_TIME_WAIT) { 824 struct inet_timewait_sock *tw; 825 826 inet_twsk_for_each(tw, node, 827 &head->twchain) { 828 829 if (num < s_num) 830 goto next_dying; 831 if (r->id.idiag_sport != tw->tw_sport && 832 r->id.idiag_sport) 833 goto next_dying; 834 if (r->id.idiag_dport != tw->tw_dport && 835 r->id.idiag_dport) 836 goto next_dying; 837 if (inet_twsk_diag_dump(tw, skb, cb) < 0) { 838 spin_unlock_bh(lock); 839 goto done; 840 } 841 next_dying: 842 ++num; 843 } 844 } 845 spin_unlock_bh(lock); 846 } 847 848 done: 849 cb->args[1] = i; 850 cb->args[2] = num; 851 unlock: 852 inet_diag_unlock_handler(handler); 853 return skb->len; 854 } 855 856 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 857 { 858 int hdrlen = sizeof(struct inet_diag_req); 859 860 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 861 nlmsg_len(nlh) < hdrlen) 862 return -EINVAL; 863 864 if (nlh->nlmsg_flags & NLM_F_DUMP) { 865 if (nlmsg_attrlen(nlh, hdrlen)) { 866 struct nlattr *attr; 867 868 attr = nlmsg_find_attr(nlh, hdrlen, 869 INET_DIAG_REQ_BYTECODE); 870 if (attr == NULL || 871 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 872 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 873 return -EINVAL; 874 } 875 876 return netlink_dump_start(idiagnl, skb, nlh, 877 inet_diag_dump, NULL, 0); 878 } 879 880 return inet_diag_get_exact(skb, nlh); 881 } 882 883 static DEFINE_MUTEX(inet_diag_mutex); 884 885 static void inet_diag_rcv(struct sk_buff *skb) 886 { 887 mutex_lock(&inet_diag_mutex); 888 netlink_rcv_skb(skb, &inet_diag_rcv_msg); 889 mutex_unlock(&inet_diag_mutex); 890 } 891 892 int inet_diag_register(const struct inet_diag_handler *h) 893 { 894 const __u16 type = h->idiag_type; 895 int err = -EINVAL; 896 897 if (type >= INET_DIAG_GETSOCK_MAX) 898 goto out; 899 900 mutex_lock(&inet_diag_table_mutex); 901 err = -EEXIST; 902 if (inet_diag_table[type] == NULL) { 903 inet_diag_table[type] = h; 904 err = 0; 905 } 906 mutex_unlock(&inet_diag_table_mutex); 907 out: 908 return err; 909 } 910 EXPORT_SYMBOL_GPL(inet_diag_register); 911 912 void inet_diag_unregister(const struct inet_diag_handler *h) 913 { 914 const __u16 type = h->idiag_type; 915 916 if (type >= INET_DIAG_GETSOCK_MAX) 917 return; 918 919 mutex_lock(&inet_diag_table_mutex); 920 inet_diag_table[type] = NULL; 921 mutex_unlock(&inet_diag_table_mutex); 922 } 923 EXPORT_SYMBOL_GPL(inet_diag_unregister); 924 925 static int __init inet_diag_init(void) 926 { 927 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX * 928 sizeof(struct inet_diag_handler *)); 929 int err = -ENOMEM; 930 931 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 932 if (!inet_diag_table) 933 goto out; 934 935 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0, 936 inet_diag_rcv, NULL, THIS_MODULE); 937 if (idiagnl == NULL) 938 goto out_free_table; 939 err = 0; 940 out: 941 return err; 942 out_free_table: 943 kfree(inet_diag_table); 944 goto out; 945 } 946 947 static void __exit inet_diag_exit(void) 948 { 949 netlink_kernel_release(idiagnl); 950 kfree(inet_diag_table); 951 } 952 953 module_init(inet_diag_init); 954 module_exit(inet_diag_exit); 955 MODULE_LICENSE("GPL"); 956 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG); 957