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 static struct sock *sdiagnl; 50 51 #define INET_DIAG_PUT(skb, attrtype, attrlen) \ 52 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) 53 54 static inline int inet_diag_type2proto(int type) 55 { 56 switch (type) { 57 case TCPDIAG_GETSOCK: 58 return IPPROTO_TCP; 59 case DCCPDIAG_GETSOCK: 60 return IPPROTO_DCCP; 61 default: 62 return 0; 63 } 64 } 65 66 static DEFINE_MUTEX(inet_diag_table_mutex); 67 68 static const struct inet_diag_handler *inet_diag_lock_handler(int proto) 69 { 70 if (!inet_diag_table[proto]) 71 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, 72 NETLINK_SOCK_DIAG, proto); 73 74 mutex_lock(&inet_diag_table_mutex); 75 if (!inet_diag_table[proto]) 76 return ERR_PTR(-ENOENT); 77 78 return inet_diag_table[proto]; 79 } 80 81 static inline void inet_diag_unlock_handler( 82 const struct inet_diag_handler *handler) 83 { 84 mutex_unlock(&inet_diag_table_mutex); 85 } 86 87 static int inet_csk_diag_fill(struct sock *sk, 88 struct sk_buff *skb, 89 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 90 const struct nlmsghdr *unlh) 91 { 92 const struct inet_sock *inet = inet_sk(sk); 93 const struct inet_connection_sock *icsk = inet_csk(sk); 94 struct inet_diag_msg *r; 95 struct nlmsghdr *nlh; 96 void *info = NULL; 97 struct inet_diag_meminfo *minfo = NULL; 98 unsigned char *b = skb_tail_pointer(skb); 99 const struct inet_diag_handler *handler; 100 101 handler = inet_diag_table[inet_diag_type2proto(unlh->nlmsg_type)]; 102 BUG_ON(handler == NULL); 103 104 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 105 nlh->nlmsg_flags = nlmsg_flags; 106 107 r = NLMSG_DATA(nlh); 108 BUG_ON(sk->sk_state == TCP_TIME_WAIT); 109 110 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) 111 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo)); 112 113 if (ext & (1 << (INET_DIAG_INFO - 1))) 114 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, 115 handler->idiag_info_size); 116 117 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { 118 const size_t len = strlen(icsk->icsk_ca_ops->name); 119 120 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), 121 icsk->icsk_ca_ops->name); 122 } 123 124 r->idiag_family = sk->sk_family; 125 r->idiag_state = sk->sk_state; 126 r->idiag_timer = 0; 127 r->idiag_retrans = 0; 128 129 r->id.idiag_if = sk->sk_bound_dev_if; 130 r->id.idiag_cookie[0] = (u32)(unsigned long)sk; 131 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); 132 133 r->id.idiag_sport = inet->inet_sport; 134 r->id.idiag_dport = inet->inet_dport; 135 r->id.idiag_src[0] = inet->inet_rcv_saddr; 136 r->id.idiag_dst[0] = inet->inet_daddr; 137 138 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, 139 * hence this needs to be included regardless of socket family. 140 */ 141 if (ext & (1 << (INET_DIAG_TOS - 1))) 142 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos); 143 144 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 145 if (r->idiag_family == AF_INET6) { 146 const struct ipv6_pinfo *np = inet6_sk(sk); 147 148 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr; 149 *(struct in6_addr *)r->id.idiag_dst = np->daddr; 150 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 151 RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass); 152 } 153 #endif 154 155 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) 156 157 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 158 r->idiag_timer = 1; 159 r->idiag_retrans = icsk->icsk_retransmits; 160 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 161 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 162 r->idiag_timer = 4; 163 r->idiag_retrans = icsk->icsk_probes_out; 164 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 165 } else if (timer_pending(&sk->sk_timer)) { 166 r->idiag_timer = 2; 167 r->idiag_retrans = icsk->icsk_probes_out; 168 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 169 } else { 170 r->idiag_timer = 0; 171 r->idiag_expires = 0; 172 } 173 #undef EXPIRES_IN_MS 174 175 r->idiag_uid = sock_i_uid(sk); 176 r->idiag_inode = sock_i_ino(sk); 177 178 if (minfo) { 179 minfo->idiag_rmem = sk_rmem_alloc_get(sk); 180 minfo->idiag_wmem = sk->sk_wmem_queued; 181 minfo->idiag_fmem = sk->sk_forward_alloc; 182 minfo->idiag_tmem = sk_wmem_alloc_get(sk); 183 } 184 185 handler->idiag_get_info(sk, r, info); 186 187 if (sk->sk_state < TCP_TIME_WAIT && 188 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 189 icsk->icsk_ca_ops->get_info(sk, ext, skb); 190 191 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 192 return skb->len; 193 194 rtattr_failure: 195 nlmsg_failure: 196 nlmsg_trim(skb, b); 197 return -EMSGSIZE; 198 } 199 200 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 201 struct sk_buff *skb, int ext, u32 pid, 202 u32 seq, u16 nlmsg_flags, 203 const struct nlmsghdr *unlh) 204 { 205 long tmo; 206 struct inet_diag_msg *r; 207 const unsigned char *previous_tail = skb_tail_pointer(skb); 208 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq, 209 unlh->nlmsg_type, sizeof(*r)); 210 211 r = NLMSG_DATA(nlh); 212 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 213 214 nlh->nlmsg_flags = nlmsg_flags; 215 216 tmo = tw->tw_ttd - jiffies; 217 if (tmo < 0) 218 tmo = 0; 219 220 r->idiag_family = tw->tw_family; 221 r->idiag_retrans = 0; 222 r->id.idiag_if = tw->tw_bound_dev_if; 223 r->id.idiag_cookie[0] = (u32)(unsigned long)tw; 224 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1); 225 r->id.idiag_sport = tw->tw_sport; 226 r->id.idiag_dport = tw->tw_dport; 227 r->id.idiag_src[0] = tw->tw_rcv_saddr; 228 r->id.idiag_dst[0] = tw->tw_daddr; 229 r->idiag_state = tw->tw_substate; 230 r->idiag_timer = 3; 231 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); 232 r->idiag_rqueue = 0; 233 r->idiag_wqueue = 0; 234 r->idiag_uid = 0; 235 r->idiag_inode = 0; 236 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 237 if (tw->tw_family == AF_INET6) { 238 const struct inet6_timewait_sock *tw6 = 239 inet6_twsk((struct sock *)tw); 240 241 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr; 242 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr; 243 } 244 #endif 245 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; 246 return skb->len; 247 nlmsg_failure: 248 nlmsg_trim(skb, previous_tail); 249 return -EMSGSIZE; 250 } 251 252 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 253 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 254 const struct nlmsghdr *unlh) 255 { 256 if (sk->sk_state == TCP_TIME_WAIT) 257 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 258 skb, ext, pid, seq, nlmsg_flags, 259 unlh); 260 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh); 261 } 262 263 static int inet_diag_get_exact(struct sk_buff *in_skb, 264 const struct nlmsghdr *nlh, 265 struct inet_diag_req *req) 266 { 267 int err; 268 struct sock *sk; 269 struct sk_buff *rep; 270 struct inet_hashinfo *hashinfo; 271 const struct inet_diag_handler *handler; 272 273 handler = inet_diag_lock_handler(req->sdiag_protocol); 274 if (IS_ERR(handler)) { 275 err = PTR_ERR(handler); 276 goto unlock; 277 } 278 279 hashinfo = handler->idiag_hashinfo; 280 err = -EINVAL; 281 282 if (req->sdiag_family == AF_INET) { 283 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], 284 req->id.idiag_dport, req->id.idiag_src[0], 285 req->id.idiag_sport, req->id.idiag_if); 286 } 287 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 288 else if (req->sdiag_family == AF_INET6) { 289 sk = inet6_lookup(&init_net, hashinfo, 290 (struct in6_addr *)req->id.idiag_dst, 291 req->id.idiag_dport, 292 (struct in6_addr *)req->id.idiag_src, 293 req->id.idiag_sport, 294 req->id.idiag_if); 295 } 296 #endif 297 else { 298 goto unlock; 299 } 300 301 err = -ENOENT; 302 if (sk == NULL) 303 goto unlock; 304 305 err = -ESTALE; 306 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || 307 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && 308 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || 309 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) 310 goto out; 311 312 err = -ENOMEM; 313 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 314 sizeof(struct inet_diag_meminfo) + 315 handler->idiag_info_size + 64)), 316 GFP_KERNEL); 317 if (!rep) 318 goto out; 319 320 err = sk_diag_fill(sk, rep, req->idiag_ext, 321 NETLINK_CB(in_skb).pid, 322 nlh->nlmsg_seq, 0, nlh); 323 if (err < 0) { 324 WARN_ON(err == -EMSGSIZE); 325 kfree_skb(rep); 326 goto out; 327 } 328 err = netlink_unicast(sdiagnl, rep, NETLINK_CB(in_skb).pid, 329 MSG_DONTWAIT); 330 if (err > 0) 331 err = 0; 332 333 out: 334 if (sk) { 335 if (sk->sk_state == TCP_TIME_WAIT) 336 inet_twsk_put((struct inet_timewait_sock *)sk); 337 else 338 sock_put(sk); 339 } 340 unlock: 341 inet_diag_unlock_handler(handler); 342 return err; 343 } 344 345 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 346 { 347 int words = bits >> 5; 348 349 bits &= 0x1f; 350 351 if (words) { 352 if (memcmp(a1, a2, words << 2)) 353 return 0; 354 } 355 if (bits) { 356 __be32 w1, w2; 357 __be32 mask; 358 359 w1 = a1[words]; 360 w2 = a2[words]; 361 362 mask = htonl((0xffffffff) << (32 - bits)); 363 364 if ((w1 ^ w2) & mask) 365 return 0; 366 } 367 368 return 1; 369 } 370 371 372 static int inet_diag_bc_run(const void *bc, int len, 373 const struct inet_diag_entry *entry) 374 { 375 while (len > 0) { 376 int yes = 1; 377 const struct inet_diag_bc_op *op = bc; 378 379 switch (op->code) { 380 case INET_DIAG_BC_NOP: 381 break; 382 case INET_DIAG_BC_JMP: 383 yes = 0; 384 break; 385 case INET_DIAG_BC_S_GE: 386 yes = entry->sport >= op[1].no; 387 break; 388 case INET_DIAG_BC_S_LE: 389 yes = entry->sport <= op[1].no; 390 break; 391 case INET_DIAG_BC_D_GE: 392 yes = entry->dport >= op[1].no; 393 break; 394 case INET_DIAG_BC_D_LE: 395 yes = entry->dport <= op[1].no; 396 break; 397 case INET_DIAG_BC_AUTO: 398 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 399 break; 400 case INET_DIAG_BC_S_COND: 401 case INET_DIAG_BC_D_COND: { 402 struct inet_diag_hostcond *cond; 403 __be32 *addr; 404 405 cond = (struct inet_diag_hostcond *)(op + 1); 406 if (cond->port != -1 && 407 cond->port != (op->code == INET_DIAG_BC_S_COND ? 408 entry->sport : entry->dport)) { 409 yes = 0; 410 break; 411 } 412 413 if (cond->prefix_len == 0) 414 break; 415 416 if (op->code == INET_DIAG_BC_S_COND) 417 addr = entry->saddr; 418 else 419 addr = entry->daddr; 420 421 if (bitstring_match(addr, cond->addr, 422 cond->prefix_len)) 423 break; 424 if (entry->family == AF_INET6 && 425 cond->family == AF_INET) { 426 if (addr[0] == 0 && addr[1] == 0 && 427 addr[2] == htonl(0xffff) && 428 bitstring_match(addr + 3, cond->addr, 429 cond->prefix_len)) 430 break; 431 } 432 yes = 0; 433 break; 434 } 435 } 436 437 if (yes) { 438 len -= op->yes; 439 bc += op->yes; 440 } else { 441 len -= op->no; 442 bc += op->no; 443 } 444 } 445 return len == 0; 446 } 447 448 static int valid_cc(const void *bc, int len, int cc) 449 { 450 while (len >= 0) { 451 const struct inet_diag_bc_op *op = bc; 452 453 if (cc > len) 454 return 0; 455 if (cc == len) 456 return 1; 457 if (op->yes < 4 || op->yes & 3) 458 return 0; 459 len -= op->yes; 460 bc += op->yes; 461 } 462 return 0; 463 } 464 465 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 466 { 467 const void *bc = bytecode; 468 int len = bytecode_len; 469 470 while (len > 0) { 471 const struct inet_diag_bc_op *op = bc; 472 473 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 474 switch (op->code) { 475 case INET_DIAG_BC_AUTO: 476 case INET_DIAG_BC_S_COND: 477 case INET_DIAG_BC_D_COND: 478 case INET_DIAG_BC_S_GE: 479 case INET_DIAG_BC_S_LE: 480 case INET_DIAG_BC_D_GE: 481 case INET_DIAG_BC_D_LE: 482 case INET_DIAG_BC_JMP: 483 if (op->no < 4 || op->no > len + 4 || op->no & 3) 484 return -EINVAL; 485 if (op->no < len && 486 !valid_cc(bytecode, bytecode_len, len - op->no)) 487 return -EINVAL; 488 break; 489 case INET_DIAG_BC_NOP: 490 break; 491 default: 492 return -EINVAL; 493 } 494 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3) 495 return -EINVAL; 496 bc += op->yes; 497 len -= op->yes; 498 } 499 return len == 0 ? 0 : -EINVAL; 500 } 501 502 static int inet_csk_diag_dump(struct sock *sk, 503 struct sk_buff *skb, 504 struct netlink_callback *cb, 505 struct inet_diag_req *r, 506 const struct nlattr *bc) 507 { 508 if (bc != NULL) { 509 struct inet_diag_entry entry; 510 struct inet_sock *inet = inet_sk(sk); 511 512 entry.family = sk->sk_family; 513 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 514 if (entry.family == AF_INET6) { 515 struct ipv6_pinfo *np = inet6_sk(sk); 516 517 entry.saddr = np->rcv_saddr.s6_addr32; 518 entry.daddr = np->daddr.s6_addr32; 519 } else 520 #endif 521 { 522 entry.saddr = &inet->inet_rcv_saddr; 523 entry.daddr = &inet->inet_daddr; 524 } 525 entry.sport = inet->inet_num; 526 entry.dport = ntohs(inet->inet_dport); 527 entry.userlocks = sk->sk_userlocks; 528 529 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry)) 530 return 0; 531 } 532 533 return inet_csk_diag_fill(sk, skb, r->idiag_ext, 534 NETLINK_CB(cb->skb).pid, 535 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 536 } 537 538 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 539 struct sk_buff *skb, 540 struct netlink_callback *cb, 541 struct inet_diag_req *r, 542 const struct nlattr *bc) 543 { 544 if (bc != NULL) { 545 struct inet_diag_entry entry; 546 547 entry.family = tw->tw_family; 548 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 549 if (tw->tw_family == AF_INET6) { 550 struct inet6_timewait_sock *tw6 = 551 inet6_twsk((struct sock *)tw); 552 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 553 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 554 } else 555 #endif 556 { 557 entry.saddr = &tw->tw_rcv_saddr; 558 entry.daddr = &tw->tw_daddr; 559 } 560 entry.sport = tw->tw_num; 561 entry.dport = ntohs(tw->tw_dport); 562 entry.userlocks = 0; 563 564 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry)) 565 return 0; 566 } 567 568 return inet_twsk_diag_fill(tw, skb, r->idiag_ext, 569 NETLINK_CB(cb->skb).pid, 570 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 571 } 572 573 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 574 struct request_sock *req, u32 pid, u32 seq, 575 const struct nlmsghdr *unlh) 576 { 577 const struct inet_request_sock *ireq = inet_rsk(req); 578 struct inet_sock *inet = inet_sk(sk); 579 unsigned char *b = skb_tail_pointer(skb); 580 struct inet_diag_msg *r; 581 struct nlmsghdr *nlh; 582 long tmo; 583 584 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 585 nlh->nlmsg_flags = NLM_F_MULTI; 586 r = NLMSG_DATA(nlh); 587 588 r->idiag_family = sk->sk_family; 589 r->idiag_state = TCP_SYN_RECV; 590 r->idiag_timer = 1; 591 r->idiag_retrans = req->retrans; 592 593 r->id.idiag_if = sk->sk_bound_dev_if; 594 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 595 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 596 597 tmo = req->expires - jiffies; 598 if (tmo < 0) 599 tmo = 0; 600 601 r->id.idiag_sport = inet->inet_sport; 602 r->id.idiag_dport = ireq->rmt_port; 603 r->id.idiag_src[0] = ireq->loc_addr; 604 r->id.idiag_dst[0] = ireq->rmt_addr; 605 r->idiag_expires = jiffies_to_msecs(tmo); 606 r->idiag_rqueue = 0; 607 r->idiag_wqueue = 0; 608 r->idiag_uid = sock_i_uid(sk); 609 r->idiag_inode = 0; 610 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 611 if (r->idiag_family == AF_INET6) { 612 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr; 613 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr; 614 } 615 #endif 616 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 617 618 return skb->len; 619 620 nlmsg_failure: 621 nlmsg_trim(skb, b); 622 return -1; 623 } 624 625 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 626 struct netlink_callback *cb, 627 struct inet_diag_req *r, 628 const struct nlattr *bc) 629 { 630 struct inet_diag_entry entry; 631 struct inet_connection_sock *icsk = inet_csk(sk); 632 struct listen_sock *lopt; 633 struct inet_sock *inet = inet_sk(sk); 634 int j, s_j; 635 int reqnum, s_reqnum; 636 int err = 0; 637 638 s_j = cb->args[3]; 639 s_reqnum = cb->args[4]; 640 641 if (s_j > 0) 642 s_j--; 643 644 entry.family = sk->sk_family; 645 646 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 647 648 lopt = icsk->icsk_accept_queue.listen_opt; 649 if (!lopt || !lopt->qlen) 650 goto out; 651 652 if (bc != NULL) { 653 entry.sport = inet->inet_num; 654 entry.userlocks = sk->sk_userlocks; 655 } 656 657 for (j = s_j; j < lopt->nr_table_entries; j++) { 658 struct request_sock *req, *head = lopt->syn_table[j]; 659 660 reqnum = 0; 661 for (req = head; req; reqnum++, req = req->dl_next) { 662 struct inet_request_sock *ireq = inet_rsk(req); 663 664 if (reqnum < s_reqnum) 665 continue; 666 if (r->id.idiag_dport != ireq->rmt_port && 667 r->id.idiag_dport) 668 continue; 669 670 if (bc) { 671 entry.saddr = 672 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 673 (entry.family == AF_INET6) ? 674 inet6_rsk(req)->loc_addr.s6_addr32 : 675 #endif 676 &ireq->loc_addr; 677 entry.daddr = 678 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 679 (entry.family == AF_INET6) ? 680 inet6_rsk(req)->rmt_addr.s6_addr32 : 681 #endif 682 &ireq->rmt_addr; 683 entry.dport = ntohs(ireq->rmt_port); 684 685 if (!inet_diag_bc_run(nla_data(bc), 686 nla_len(bc), &entry)) 687 continue; 688 } 689 690 err = inet_diag_fill_req(skb, sk, req, 691 NETLINK_CB(cb->skb).pid, 692 cb->nlh->nlmsg_seq, cb->nlh); 693 if (err < 0) { 694 cb->args[3] = j + 1; 695 cb->args[4] = reqnum; 696 goto out; 697 } 698 } 699 700 s_reqnum = 0; 701 } 702 703 out: 704 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 705 706 return err; 707 } 708 709 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 710 struct inet_diag_req *r, struct nlattr *bc) 711 { 712 int i, num; 713 int s_i, s_num; 714 const struct inet_diag_handler *handler; 715 struct inet_hashinfo *hashinfo; 716 717 handler = inet_diag_lock_handler(r->sdiag_protocol); 718 if (IS_ERR(handler)) 719 goto unlock; 720 721 hashinfo = handler->idiag_hashinfo; 722 723 s_i = cb->args[1]; 724 s_num = num = cb->args[2]; 725 726 if (cb->args[0] == 0) { 727 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 728 goto skip_listen_ht; 729 730 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 731 struct sock *sk; 732 struct hlist_nulls_node *node; 733 struct inet_listen_hashbucket *ilb; 734 735 num = 0; 736 ilb = &hashinfo->listening_hash[i]; 737 spin_lock_bh(&ilb->lock); 738 sk_nulls_for_each(sk, node, &ilb->head) { 739 struct inet_sock *inet = inet_sk(sk); 740 741 if (num < s_num) { 742 num++; 743 continue; 744 } 745 746 if (r->sdiag_family != AF_UNSPEC && 747 sk->sk_family != r->sdiag_family) 748 goto next_listen; 749 750 if (r->id.idiag_sport != inet->inet_sport && 751 r->id.idiag_sport) 752 goto next_listen; 753 754 if (!(r->idiag_states & TCPF_LISTEN) || 755 r->id.idiag_dport || 756 cb->args[3] > 0) 757 goto syn_recv; 758 759 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 760 spin_unlock_bh(&ilb->lock); 761 goto done; 762 } 763 764 syn_recv: 765 if (!(r->idiag_states & TCPF_SYN_RECV)) 766 goto next_listen; 767 768 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) { 769 spin_unlock_bh(&ilb->lock); 770 goto done; 771 } 772 773 next_listen: 774 cb->args[3] = 0; 775 cb->args[4] = 0; 776 ++num; 777 } 778 spin_unlock_bh(&ilb->lock); 779 780 s_num = 0; 781 cb->args[3] = 0; 782 cb->args[4] = 0; 783 } 784 skip_listen_ht: 785 cb->args[0] = 1; 786 s_i = num = s_num = 0; 787 } 788 789 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 790 goto unlock; 791 792 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 793 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 794 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 795 struct sock *sk; 796 struct hlist_nulls_node *node; 797 798 num = 0; 799 800 if (hlist_nulls_empty(&head->chain) && 801 hlist_nulls_empty(&head->twchain)) 802 continue; 803 804 if (i > s_i) 805 s_num = 0; 806 807 spin_lock_bh(lock); 808 sk_nulls_for_each(sk, node, &head->chain) { 809 struct inet_sock *inet = inet_sk(sk); 810 811 if (num < s_num) 812 goto next_normal; 813 if (!(r->idiag_states & (1 << sk->sk_state))) 814 goto next_normal; 815 if (r->sdiag_family != AF_UNSPEC && 816 sk->sk_family != r->sdiag_family) 817 goto next_normal; 818 if (r->id.idiag_sport != inet->inet_sport && 819 r->id.idiag_sport) 820 goto next_normal; 821 if (r->id.idiag_dport != inet->inet_dport && 822 r->id.idiag_dport) 823 goto next_normal; 824 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 825 spin_unlock_bh(lock); 826 goto done; 827 } 828 next_normal: 829 ++num; 830 } 831 832 if (r->idiag_states & TCPF_TIME_WAIT) { 833 struct inet_timewait_sock *tw; 834 835 inet_twsk_for_each(tw, node, 836 &head->twchain) { 837 838 if (num < s_num) 839 goto next_dying; 840 if (r->sdiag_family != AF_UNSPEC && 841 tw->tw_family != r->sdiag_family) 842 goto next_dying; 843 if (r->id.idiag_sport != tw->tw_sport && 844 r->id.idiag_sport) 845 goto next_dying; 846 if (r->id.idiag_dport != tw->tw_dport && 847 r->id.idiag_dport) 848 goto next_dying; 849 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) { 850 spin_unlock_bh(lock); 851 goto done; 852 } 853 next_dying: 854 ++num; 855 } 856 } 857 spin_unlock_bh(lock); 858 } 859 860 done: 861 cb->args[1] = i; 862 cb->args[2] = num; 863 unlock: 864 inet_diag_unlock_handler(handler); 865 return skb->len; 866 } 867 868 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 869 { 870 struct nlattr *bc = NULL; 871 int hdrlen = sizeof(struct inet_diag_req); 872 873 if (nlmsg_attrlen(cb->nlh, hdrlen)) 874 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 875 876 return __inet_diag_dump(skb, cb, (struct inet_diag_req *)NLMSG_DATA(cb->nlh), bc); 877 } 878 879 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb) 880 { 881 struct inet_diag_req_compat *rc = NLMSG_DATA(cb->nlh); 882 struct inet_diag_req req; 883 struct nlattr *bc = NULL; 884 int hdrlen = sizeof(struct inet_diag_req_compat); 885 886 req.sdiag_family = AF_UNSPEC; /* compatibility */ 887 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 888 req.idiag_ext = rc->idiag_ext; 889 req.idiag_states = rc->idiag_states; 890 req.id = rc->id; 891 892 if (nlmsg_attrlen(cb->nlh, hdrlen)) 893 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 894 895 return __inet_diag_dump(skb, cb, &req, bc); 896 } 897 898 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 899 const struct nlmsghdr *nlh) 900 { 901 struct inet_diag_req_compat *rc = NLMSG_DATA(nlh); 902 struct inet_diag_req req; 903 904 req.sdiag_family = rc->idiag_family; 905 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 906 req.idiag_ext = rc->idiag_ext; 907 req.idiag_states = rc->idiag_states; 908 req.id = rc->id; 909 910 return inet_diag_get_exact(in_skb, nlh, &req); 911 } 912 913 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 914 { 915 int hdrlen = sizeof(struct inet_diag_req_compat); 916 917 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 918 nlmsg_len(nlh) < hdrlen) 919 return -EINVAL; 920 921 if (nlh->nlmsg_flags & NLM_F_DUMP) { 922 if (nlmsg_attrlen(nlh, hdrlen)) { 923 struct nlattr *attr; 924 925 attr = nlmsg_find_attr(nlh, hdrlen, 926 INET_DIAG_REQ_BYTECODE); 927 if (attr == NULL || 928 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 929 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 930 return -EINVAL; 931 } 932 933 return netlink_dump_start(sdiagnl, skb, nlh, 934 inet_diag_dump_compat, NULL, 0); 935 } 936 937 return inet_diag_get_exact_compat(skb, nlh); 938 } 939 940 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) 941 { 942 int hdrlen = sizeof(struct inet_diag_req); 943 944 if (nlmsg_len(h) < hdrlen) 945 return -EINVAL; 946 947 if (h->nlmsg_flags & NLM_F_DUMP) { 948 if (nlmsg_attrlen(h, hdrlen)) { 949 struct nlattr *attr; 950 attr = nlmsg_find_attr(h, hdrlen, 951 INET_DIAG_REQ_BYTECODE); 952 if (attr == NULL || 953 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 954 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 955 return -EINVAL; 956 } 957 958 return netlink_dump_start(sdiagnl, skb, h, 959 inet_diag_dump, NULL, 0); 960 } 961 962 return inet_diag_get_exact(skb, h, (struct inet_diag_req *)NLMSG_DATA(h)); 963 } 964 965 static struct sock_diag_handler inet_diag_handler = { 966 .family = AF_INET, 967 .dump = inet_diag_handler_dump, 968 }; 969 970 static struct sock_diag_handler inet6_diag_handler = { 971 .family = AF_INET6, 972 .dump = inet_diag_handler_dump, 973 }; 974 975 static struct sock_diag_handler *sock_diag_handlers[AF_MAX]; 976 static DEFINE_MUTEX(sock_diag_table_mutex); 977 978 int sock_diag_register(struct sock_diag_handler *hndl) 979 { 980 int err = 0; 981 982 if (hndl->family > AF_MAX) 983 return -EINVAL; 984 985 mutex_lock(&sock_diag_table_mutex); 986 if (sock_diag_handlers[hndl->family]) 987 err = -EBUSY; 988 else 989 sock_diag_handlers[hndl->family] = hndl; 990 mutex_unlock(&sock_diag_table_mutex); 991 992 return err; 993 } 994 995 void sock_diag_unregister(struct sock_diag_handler *hnld) 996 { 997 int family = hnld->family; 998 999 if (family > AF_MAX) 1000 return; 1001 1002 mutex_lock(&sock_diag_table_mutex); 1003 BUG_ON(sock_diag_handlers[family] != hnld); 1004 sock_diag_handlers[family] = NULL; 1005 mutex_unlock(&sock_diag_table_mutex); 1006 } 1007 1008 static inline struct sock_diag_handler *sock_diag_lock_handler(int family) 1009 { 1010 mutex_lock(&sock_diag_table_mutex); 1011 return sock_diag_handlers[family]; 1012 } 1013 1014 static inline void sock_diag_unlock_handler(struct sock_diag_handler *h) 1015 { 1016 mutex_unlock(&sock_diag_table_mutex); 1017 } 1018 1019 static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1020 { 1021 int err; 1022 struct sock_diag_req *req = NLMSG_DATA(nlh); 1023 struct sock_diag_handler *hndl; 1024 1025 if (nlmsg_len(nlh) < sizeof(*req)) 1026 return -EINVAL; 1027 1028 hndl = sock_diag_lock_handler(req->sdiag_family); 1029 if (hndl == NULL) 1030 err = -ENOENT; 1031 else 1032 err = hndl->dump(skb, nlh); 1033 sock_diag_unlock_handler(hndl); 1034 1035 return err; 1036 } 1037 1038 static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1039 { 1040 switch (nlh->nlmsg_type) { 1041 case TCPDIAG_GETSOCK: 1042 case DCCPDIAG_GETSOCK: 1043 return inet_diag_rcv_msg_compat(skb, nlh); 1044 case SOCK_DIAG_BY_FAMILY: 1045 return __sock_diag_rcv_msg(skb, nlh); 1046 default: 1047 return -EINVAL; 1048 } 1049 } 1050 1051 static DEFINE_MUTEX(sock_diag_mutex); 1052 1053 static void sock_diag_rcv(struct sk_buff *skb) 1054 { 1055 mutex_lock(&sock_diag_mutex); 1056 netlink_rcv_skb(skb, &sock_diag_rcv_msg); 1057 mutex_unlock(&sock_diag_mutex); 1058 } 1059 1060 int inet_diag_register(const struct inet_diag_handler *h) 1061 { 1062 const __u16 type = h->idiag_type; 1063 int err = -EINVAL; 1064 1065 if (type >= IPPROTO_MAX) 1066 goto out; 1067 1068 mutex_lock(&inet_diag_table_mutex); 1069 err = -EEXIST; 1070 if (inet_diag_table[type] == NULL) { 1071 inet_diag_table[type] = h; 1072 err = 0; 1073 } 1074 mutex_unlock(&inet_diag_table_mutex); 1075 out: 1076 return err; 1077 } 1078 EXPORT_SYMBOL_GPL(inet_diag_register); 1079 1080 void inet_diag_unregister(const struct inet_diag_handler *h) 1081 { 1082 const __u16 type = h->idiag_type; 1083 1084 if (type >= IPPROTO_MAX) 1085 return; 1086 1087 mutex_lock(&inet_diag_table_mutex); 1088 inet_diag_table[type] = NULL; 1089 mutex_unlock(&inet_diag_table_mutex); 1090 } 1091 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1092 1093 static int __init inet_diag_init(void) 1094 { 1095 const int inet_diag_table_size = (IPPROTO_MAX * 1096 sizeof(struct inet_diag_handler *)); 1097 int err = -ENOMEM; 1098 1099 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1100 if (!inet_diag_table) 1101 goto out; 1102 1103 sdiagnl = netlink_kernel_create(&init_net, NETLINK_SOCK_DIAG, 0, 1104 sock_diag_rcv, NULL, THIS_MODULE); 1105 if (sdiagnl == NULL) 1106 goto out_free_table; 1107 1108 err = sock_diag_register(&inet_diag_handler); 1109 if (err) 1110 goto out_free_nl; 1111 1112 err = sock_diag_register(&inet6_diag_handler); 1113 if (err) 1114 goto out_free_inet; 1115 1116 out: 1117 return err; 1118 1119 out_free_inet: 1120 sock_diag_unregister(&inet_diag_handler); 1121 out_free_nl: 1122 netlink_kernel_release(sdiagnl); 1123 out_free_table: 1124 kfree(inet_diag_table); 1125 goto out; 1126 } 1127 1128 static void __exit inet_diag_exit(void) 1129 { 1130 sock_diag_unregister(&inet6_diag_handler); 1131 sock_diag_unregister(&inet_diag_handler); 1132 netlink_kernel_release(sdiagnl); 1133 kfree(inet_diag_table); 1134 } 1135 1136 module_init(inet_diag_init); 1137 module_exit(inet_diag_exit); 1138 MODULE_LICENSE("GPL"); 1139 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG); 1140