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_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb, 262 const struct nlmsghdr *nlh, struct inet_diag_req *req) 263 { 264 int err; 265 struct sock *sk; 266 struct sk_buff *rep; 267 268 err = -EINVAL; 269 if (req->sdiag_family == AF_INET) { 270 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], 271 req->id.idiag_dport, req->id.idiag_src[0], 272 req->id.idiag_sport, req->id.idiag_if); 273 } 274 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 275 else if (req->sdiag_family == AF_INET6) { 276 sk = inet6_lookup(&init_net, hashinfo, 277 (struct in6_addr *)req->id.idiag_dst, 278 req->id.idiag_dport, 279 (struct in6_addr *)req->id.idiag_src, 280 req->id.idiag_sport, 281 req->id.idiag_if); 282 } 283 #endif 284 else { 285 goto out_nosk; 286 } 287 288 err = -ENOENT; 289 if (sk == NULL) 290 goto out_nosk; 291 292 err = inet_diag_check_cookie(sk, req); 293 if (err) 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 sizeof(struct tcp_info) + 64)), 300 GFP_KERNEL); 301 if (!rep) 302 goto out; 303 304 err = sk_diag_fill(sk, rep, req, 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(sock_diag_nlsk, 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 out_nosk: 325 return err; 326 } 327 328 static int inet_diag_get_exact(struct sk_buff *in_skb, 329 const struct nlmsghdr *nlh, 330 struct inet_diag_req *req) 331 { 332 const struct inet_diag_handler *handler; 333 int err; 334 335 handler = inet_diag_lock_handler(req->sdiag_protocol); 336 if (IS_ERR(handler)) 337 err = PTR_ERR(handler); 338 else 339 err = inet_diag_dump_one_icsk(handler->idiag_hashinfo, 340 in_skb, nlh, req); 341 inet_diag_unlock_handler(handler); 342 343 return err; 344 } 345 346 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 347 { 348 int words = bits >> 5; 349 350 bits &= 0x1f; 351 352 if (words) { 353 if (memcmp(a1, a2, words << 2)) 354 return 0; 355 } 356 if (bits) { 357 __be32 w1, w2; 358 __be32 mask; 359 360 w1 = a1[words]; 361 w2 = a2[words]; 362 363 mask = htonl((0xffffffff) << (32 - bits)); 364 365 if ((w1 ^ w2) & mask) 366 return 0; 367 } 368 369 return 1; 370 } 371 372 373 static int inet_diag_bc_run(const struct nlattr *_bc, 374 const struct inet_diag_entry *entry) 375 { 376 const void *bc = nla_data(_bc); 377 int len = nla_len(_bc); 378 379 while (len > 0) { 380 int yes = 1; 381 const struct inet_diag_bc_op *op = bc; 382 383 switch (op->code) { 384 case INET_DIAG_BC_NOP: 385 break; 386 case INET_DIAG_BC_JMP: 387 yes = 0; 388 break; 389 case INET_DIAG_BC_S_GE: 390 yes = entry->sport >= op[1].no; 391 break; 392 case INET_DIAG_BC_S_LE: 393 yes = entry->sport <= op[1].no; 394 break; 395 case INET_DIAG_BC_D_GE: 396 yes = entry->dport >= op[1].no; 397 break; 398 case INET_DIAG_BC_D_LE: 399 yes = entry->dport <= op[1].no; 400 break; 401 case INET_DIAG_BC_AUTO: 402 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 403 break; 404 case INET_DIAG_BC_S_COND: 405 case INET_DIAG_BC_D_COND: { 406 struct inet_diag_hostcond *cond; 407 __be32 *addr; 408 409 cond = (struct inet_diag_hostcond *)(op + 1); 410 if (cond->port != -1 && 411 cond->port != (op->code == INET_DIAG_BC_S_COND ? 412 entry->sport : entry->dport)) { 413 yes = 0; 414 break; 415 } 416 417 if (cond->prefix_len == 0) 418 break; 419 420 if (op->code == INET_DIAG_BC_S_COND) 421 addr = entry->saddr; 422 else 423 addr = entry->daddr; 424 425 if (bitstring_match(addr, cond->addr, 426 cond->prefix_len)) 427 break; 428 if (entry->family == AF_INET6 && 429 cond->family == AF_INET) { 430 if (addr[0] == 0 && addr[1] == 0 && 431 addr[2] == htonl(0xffff) && 432 bitstring_match(addr + 3, cond->addr, 433 cond->prefix_len)) 434 break; 435 } 436 yes = 0; 437 break; 438 } 439 } 440 441 if (yes) { 442 len -= op->yes; 443 bc += op->yes; 444 } else { 445 len -= op->no; 446 bc += op->no; 447 } 448 } 449 return len == 0; 450 } 451 452 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) 453 { 454 struct inet_diag_entry entry; 455 struct inet_sock *inet = inet_sk(sk); 456 457 if (bc == NULL) 458 return 1; 459 460 entry.family = sk->sk_family; 461 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 462 if (entry.family == AF_INET6) { 463 struct ipv6_pinfo *np = inet6_sk(sk); 464 465 entry.saddr = np->rcv_saddr.s6_addr32; 466 entry.daddr = np->daddr.s6_addr32; 467 } else 468 #endif 469 { 470 entry.saddr = &inet->inet_rcv_saddr; 471 entry.daddr = &inet->inet_daddr; 472 } 473 entry.sport = inet->inet_num; 474 entry.dport = ntohs(inet->inet_dport); 475 entry.userlocks = sk->sk_userlocks; 476 477 return inet_diag_bc_run(bc, &entry); 478 } 479 EXPORT_SYMBOL_GPL(inet_diag_bc_sk); 480 481 static int valid_cc(const void *bc, int len, int cc) 482 { 483 while (len >= 0) { 484 const struct inet_diag_bc_op *op = bc; 485 486 if (cc > len) 487 return 0; 488 if (cc == len) 489 return 1; 490 if (op->yes < 4 || op->yes & 3) 491 return 0; 492 len -= op->yes; 493 bc += op->yes; 494 } 495 return 0; 496 } 497 498 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 499 { 500 const void *bc = bytecode; 501 int len = bytecode_len; 502 503 while (len > 0) { 504 const struct inet_diag_bc_op *op = bc; 505 506 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 507 switch (op->code) { 508 case INET_DIAG_BC_AUTO: 509 case INET_DIAG_BC_S_COND: 510 case INET_DIAG_BC_D_COND: 511 case INET_DIAG_BC_S_GE: 512 case INET_DIAG_BC_S_LE: 513 case INET_DIAG_BC_D_GE: 514 case INET_DIAG_BC_D_LE: 515 case INET_DIAG_BC_JMP: 516 if (op->no < 4 || op->no > len + 4 || op->no & 3) 517 return -EINVAL; 518 if (op->no < len && 519 !valid_cc(bytecode, bytecode_len, len - op->no)) 520 return -EINVAL; 521 break; 522 case INET_DIAG_BC_NOP: 523 break; 524 default: 525 return -EINVAL; 526 } 527 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3) 528 return -EINVAL; 529 bc += op->yes; 530 len -= op->yes; 531 } 532 return len == 0 ? 0 : -EINVAL; 533 } 534 535 static int inet_csk_diag_dump(struct sock *sk, 536 struct sk_buff *skb, 537 struct netlink_callback *cb, 538 struct inet_diag_req *r, 539 const struct nlattr *bc) 540 { 541 if (!inet_diag_bc_sk(bc, sk)) 542 return 0; 543 544 return inet_csk_diag_fill(sk, skb, r, 545 NETLINK_CB(cb->skb).pid, 546 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 547 } 548 549 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 550 struct sk_buff *skb, 551 struct netlink_callback *cb, 552 struct inet_diag_req *r, 553 const struct nlattr *bc) 554 { 555 if (bc != NULL) { 556 struct inet_diag_entry entry; 557 558 entry.family = tw->tw_family; 559 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 560 if (tw->tw_family == AF_INET6) { 561 struct inet6_timewait_sock *tw6 = 562 inet6_twsk((struct sock *)tw); 563 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 564 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 565 } else 566 #endif 567 { 568 entry.saddr = &tw->tw_rcv_saddr; 569 entry.daddr = &tw->tw_daddr; 570 } 571 entry.sport = tw->tw_num; 572 entry.dport = ntohs(tw->tw_dport); 573 entry.userlocks = 0; 574 575 if (!inet_diag_bc_run(bc, &entry)) 576 return 0; 577 } 578 579 return inet_twsk_diag_fill(tw, skb, r, 580 NETLINK_CB(cb->skb).pid, 581 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 582 } 583 584 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 585 struct request_sock *req, u32 pid, u32 seq, 586 const struct nlmsghdr *unlh) 587 { 588 const struct inet_request_sock *ireq = inet_rsk(req); 589 struct inet_sock *inet = inet_sk(sk); 590 unsigned char *b = skb_tail_pointer(skb); 591 struct inet_diag_msg *r; 592 struct nlmsghdr *nlh; 593 long tmo; 594 595 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 596 nlh->nlmsg_flags = NLM_F_MULTI; 597 r = NLMSG_DATA(nlh); 598 599 r->idiag_family = sk->sk_family; 600 r->idiag_state = TCP_SYN_RECV; 601 r->idiag_timer = 1; 602 r->idiag_retrans = req->retrans; 603 604 r->id.idiag_if = sk->sk_bound_dev_if; 605 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 606 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 607 608 tmo = req->expires - jiffies; 609 if (tmo < 0) 610 tmo = 0; 611 612 r->id.idiag_sport = inet->inet_sport; 613 r->id.idiag_dport = ireq->rmt_port; 614 r->id.idiag_src[0] = ireq->loc_addr; 615 r->id.idiag_dst[0] = ireq->rmt_addr; 616 r->idiag_expires = jiffies_to_msecs(tmo); 617 r->idiag_rqueue = 0; 618 r->idiag_wqueue = 0; 619 r->idiag_uid = sock_i_uid(sk); 620 r->idiag_inode = 0; 621 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 622 if (r->idiag_family == AF_INET6) { 623 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr; 624 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr; 625 } 626 #endif 627 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 628 629 return skb->len; 630 631 nlmsg_failure: 632 nlmsg_trim(skb, b); 633 return -1; 634 } 635 636 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 637 struct netlink_callback *cb, 638 struct inet_diag_req *r, 639 const struct nlattr *bc) 640 { 641 struct inet_diag_entry entry; 642 struct inet_connection_sock *icsk = inet_csk(sk); 643 struct listen_sock *lopt; 644 struct inet_sock *inet = inet_sk(sk); 645 int j, s_j; 646 int reqnum, s_reqnum; 647 int err = 0; 648 649 s_j = cb->args[3]; 650 s_reqnum = cb->args[4]; 651 652 if (s_j > 0) 653 s_j--; 654 655 entry.family = sk->sk_family; 656 657 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 658 659 lopt = icsk->icsk_accept_queue.listen_opt; 660 if (!lopt || !lopt->qlen) 661 goto out; 662 663 if (bc != NULL) { 664 entry.sport = inet->inet_num; 665 entry.userlocks = sk->sk_userlocks; 666 } 667 668 for (j = s_j; j < lopt->nr_table_entries; j++) { 669 struct request_sock *req, *head = lopt->syn_table[j]; 670 671 reqnum = 0; 672 for (req = head; req; reqnum++, req = req->dl_next) { 673 struct inet_request_sock *ireq = inet_rsk(req); 674 675 if (reqnum < s_reqnum) 676 continue; 677 if (r->id.idiag_dport != ireq->rmt_port && 678 r->id.idiag_dport) 679 continue; 680 681 if (bc) { 682 entry.saddr = 683 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 684 (entry.family == AF_INET6) ? 685 inet6_rsk(req)->loc_addr.s6_addr32 : 686 #endif 687 &ireq->loc_addr; 688 entry.daddr = 689 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 690 (entry.family == AF_INET6) ? 691 inet6_rsk(req)->rmt_addr.s6_addr32 : 692 #endif 693 &ireq->rmt_addr; 694 entry.dport = ntohs(ireq->rmt_port); 695 696 if (!inet_diag_bc_run(bc, &entry)) 697 continue; 698 } 699 700 err = inet_diag_fill_req(skb, sk, req, 701 NETLINK_CB(cb->skb).pid, 702 cb->nlh->nlmsg_seq, cb->nlh); 703 if (err < 0) { 704 cb->args[3] = j + 1; 705 cb->args[4] = reqnum; 706 goto out; 707 } 708 } 709 710 s_reqnum = 0; 711 } 712 713 out: 714 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 715 716 return err; 717 } 718 719 static void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, 720 struct netlink_callback *cb, struct inet_diag_req *r, struct nlattr *bc) 721 { 722 int i, num; 723 int s_i, s_num; 724 725 s_i = cb->args[1]; 726 s_num = num = cb->args[2]; 727 728 if (cb->args[0] == 0) { 729 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 730 goto skip_listen_ht; 731 732 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 733 struct sock *sk; 734 struct hlist_nulls_node *node; 735 struct inet_listen_hashbucket *ilb; 736 737 num = 0; 738 ilb = &hashinfo->listening_hash[i]; 739 spin_lock_bh(&ilb->lock); 740 sk_nulls_for_each(sk, node, &ilb->head) { 741 struct inet_sock *inet = inet_sk(sk); 742 743 if (num < s_num) { 744 num++; 745 continue; 746 } 747 748 if (r->sdiag_family != AF_UNSPEC && 749 sk->sk_family != r->sdiag_family) 750 goto next_listen; 751 752 if (r->id.idiag_sport != inet->inet_sport && 753 r->id.idiag_sport) 754 goto next_listen; 755 756 if (!(r->idiag_states & TCPF_LISTEN) || 757 r->id.idiag_dport || 758 cb->args[3] > 0) 759 goto syn_recv; 760 761 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 762 spin_unlock_bh(&ilb->lock); 763 goto done; 764 } 765 766 syn_recv: 767 if (!(r->idiag_states & TCPF_SYN_RECV)) 768 goto next_listen; 769 770 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) { 771 spin_unlock_bh(&ilb->lock); 772 goto done; 773 } 774 775 next_listen: 776 cb->args[3] = 0; 777 cb->args[4] = 0; 778 ++num; 779 } 780 spin_unlock_bh(&ilb->lock); 781 782 s_num = 0; 783 cb->args[3] = 0; 784 cb->args[4] = 0; 785 } 786 skip_listen_ht: 787 cb->args[0] = 1; 788 s_i = num = s_num = 0; 789 } 790 791 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 792 goto out; 793 794 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 795 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 796 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 797 struct sock *sk; 798 struct hlist_nulls_node *node; 799 800 num = 0; 801 802 if (hlist_nulls_empty(&head->chain) && 803 hlist_nulls_empty(&head->twchain)) 804 continue; 805 806 if (i > s_i) 807 s_num = 0; 808 809 spin_lock_bh(lock); 810 sk_nulls_for_each(sk, node, &head->chain) { 811 struct inet_sock *inet = inet_sk(sk); 812 813 if (num < s_num) 814 goto next_normal; 815 if (!(r->idiag_states & (1 << sk->sk_state))) 816 goto next_normal; 817 if (r->sdiag_family != AF_UNSPEC && 818 sk->sk_family != r->sdiag_family) 819 goto next_normal; 820 if (r->id.idiag_sport != inet->inet_sport && 821 r->id.idiag_sport) 822 goto next_normal; 823 if (r->id.idiag_dport != inet->inet_dport && 824 r->id.idiag_dport) 825 goto next_normal; 826 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 827 spin_unlock_bh(lock); 828 goto done; 829 } 830 next_normal: 831 ++num; 832 } 833 834 if (r->idiag_states & TCPF_TIME_WAIT) { 835 struct inet_timewait_sock *tw; 836 837 inet_twsk_for_each(tw, node, 838 &head->twchain) { 839 840 if (num < s_num) 841 goto next_dying; 842 if (r->sdiag_family != AF_UNSPEC && 843 tw->tw_family != r->sdiag_family) 844 goto next_dying; 845 if (r->id.idiag_sport != tw->tw_sport && 846 r->id.idiag_sport) 847 goto next_dying; 848 if (r->id.idiag_dport != tw->tw_dport && 849 r->id.idiag_dport) 850 goto next_dying; 851 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) { 852 spin_unlock_bh(lock); 853 goto done; 854 } 855 next_dying: 856 ++num; 857 } 858 } 859 spin_unlock_bh(lock); 860 } 861 862 done: 863 cb->args[1] = i; 864 cb->args[2] = num; 865 out: 866 ; 867 } 868 869 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 870 struct inet_diag_req *r, struct nlattr *bc) 871 { 872 const struct inet_diag_handler *handler; 873 874 handler = inet_diag_lock_handler(r->sdiag_protocol); 875 if (!IS_ERR(handler)) 876 inet_diag_dump_icsk(handler->idiag_hashinfo, skb, cb, r, bc); 877 inet_diag_unlock_handler(handler); 878 879 return skb->len; 880 } 881 882 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 883 { 884 struct nlattr *bc = NULL; 885 int hdrlen = sizeof(struct inet_diag_req); 886 887 if (nlmsg_attrlen(cb->nlh, hdrlen)) 888 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 889 890 return __inet_diag_dump(skb, cb, (struct inet_diag_req *)NLMSG_DATA(cb->nlh), bc); 891 } 892 893 static inline int inet_diag_type2proto(int type) 894 { 895 switch (type) { 896 case TCPDIAG_GETSOCK: 897 return IPPROTO_TCP; 898 case DCCPDIAG_GETSOCK: 899 return IPPROTO_DCCP; 900 default: 901 return 0; 902 } 903 } 904 905 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb) 906 { 907 struct inet_diag_req_compat *rc = NLMSG_DATA(cb->nlh); 908 struct inet_diag_req req; 909 struct nlattr *bc = NULL; 910 int hdrlen = sizeof(struct inet_diag_req_compat); 911 912 req.sdiag_family = AF_UNSPEC; /* compatibility */ 913 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 914 req.idiag_ext = rc->idiag_ext; 915 req.idiag_states = rc->idiag_states; 916 req.id = rc->id; 917 918 if (nlmsg_attrlen(cb->nlh, hdrlen)) 919 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 920 921 return __inet_diag_dump(skb, cb, &req, bc); 922 } 923 924 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 925 const struct nlmsghdr *nlh) 926 { 927 struct inet_diag_req_compat *rc = NLMSG_DATA(nlh); 928 struct inet_diag_req req; 929 930 req.sdiag_family = rc->idiag_family; 931 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 932 req.idiag_ext = rc->idiag_ext; 933 req.idiag_states = rc->idiag_states; 934 req.id = rc->id; 935 936 return inet_diag_get_exact(in_skb, nlh, &req); 937 } 938 939 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 940 { 941 int hdrlen = sizeof(struct inet_diag_req_compat); 942 943 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 944 nlmsg_len(nlh) < hdrlen) 945 return -EINVAL; 946 947 if (nlh->nlmsg_flags & NLM_F_DUMP) { 948 if (nlmsg_attrlen(nlh, hdrlen)) { 949 struct nlattr *attr; 950 951 attr = nlmsg_find_attr(nlh, hdrlen, 952 INET_DIAG_REQ_BYTECODE); 953 if (attr == NULL || 954 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 955 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 956 return -EINVAL; 957 } 958 959 return netlink_dump_start(sock_diag_nlsk, skb, nlh, 960 inet_diag_dump_compat, NULL, 0); 961 } 962 963 return inet_diag_get_exact_compat(skb, nlh); 964 } 965 966 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) 967 { 968 int hdrlen = sizeof(struct inet_diag_req); 969 970 if (nlmsg_len(h) < hdrlen) 971 return -EINVAL; 972 973 if (h->nlmsg_flags & NLM_F_DUMP) { 974 if (nlmsg_attrlen(h, hdrlen)) { 975 struct nlattr *attr; 976 attr = nlmsg_find_attr(h, hdrlen, 977 INET_DIAG_REQ_BYTECODE); 978 if (attr == NULL || 979 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 980 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 981 return -EINVAL; 982 } 983 984 return netlink_dump_start(sock_diag_nlsk, skb, h, 985 inet_diag_dump, NULL, 0); 986 } 987 988 return inet_diag_get_exact(skb, h, (struct inet_diag_req *)NLMSG_DATA(h)); 989 } 990 991 static struct sock_diag_handler inet_diag_handler = { 992 .family = AF_INET, 993 .dump = inet_diag_handler_dump, 994 }; 995 996 static struct sock_diag_handler inet6_diag_handler = { 997 .family = AF_INET6, 998 .dump = inet_diag_handler_dump, 999 }; 1000 1001 int inet_diag_register(const struct inet_diag_handler *h) 1002 { 1003 const __u16 type = h->idiag_type; 1004 int err = -EINVAL; 1005 1006 if (type >= IPPROTO_MAX) 1007 goto out; 1008 1009 mutex_lock(&inet_diag_table_mutex); 1010 err = -EEXIST; 1011 if (inet_diag_table[type] == NULL) { 1012 inet_diag_table[type] = h; 1013 err = 0; 1014 } 1015 mutex_unlock(&inet_diag_table_mutex); 1016 out: 1017 return err; 1018 } 1019 EXPORT_SYMBOL_GPL(inet_diag_register); 1020 1021 void inet_diag_unregister(const struct inet_diag_handler *h) 1022 { 1023 const __u16 type = h->idiag_type; 1024 1025 if (type >= IPPROTO_MAX) 1026 return; 1027 1028 mutex_lock(&inet_diag_table_mutex); 1029 inet_diag_table[type] = NULL; 1030 mutex_unlock(&inet_diag_table_mutex); 1031 } 1032 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1033 1034 static int __init inet_diag_init(void) 1035 { 1036 const int inet_diag_table_size = (IPPROTO_MAX * 1037 sizeof(struct inet_diag_handler *)); 1038 int err = -ENOMEM; 1039 1040 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1041 if (!inet_diag_table) 1042 goto out; 1043 1044 err = sock_diag_register(&inet_diag_handler); 1045 if (err) 1046 goto out_free_nl; 1047 1048 err = sock_diag_register(&inet6_diag_handler); 1049 if (err) 1050 goto out_free_inet; 1051 1052 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1053 out: 1054 return err; 1055 1056 out_free_inet: 1057 sock_diag_unregister(&inet_diag_handler); 1058 out_free_nl: 1059 kfree(inet_diag_table); 1060 goto out; 1061 } 1062 1063 static void __exit inet_diag_exit(void) 1064 { 1065 sock_diag_unregister(&inet6_diag_handler); 1066 sock_diag_unregister(&inet_diag_handler); 1067 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1068 kfree(inet_diag_table); 1069 } 1070 1071 module_init(inet_diag_init); 1072 module_exit(inet_diag_exit); 1073 MODULE_LICENSE("GPL"); 1074 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 0); 1075