1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * inet_diag.c Module for monitoring INET transport protocols sockets. 4 * 5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/module.h> 10 #include <linux/types.h> 11 #include <linux/fcntl.h> 12 #include <linux/random.h> 13 #include <linux/slab.h> 14 #include <linux/cache.h> 15 #include <linux/init.h> 16 #include <linux/time.h> 17 18 #include <net/icmp.h> 19 #include <net/tcp.h> 20 #include <net/ipv6.h> 21 #include <net/inet_common.h> 22 #include <net/inet_connection_sock.h> 23 #include <net/inet_hashtables.h> 24 #include <net/inet_timewait_sock.h> 25 #include <net/inet6_hashtables.h> 26 #include <net/netlink.h> 27 28 #include <linux/inet.h> 29 #include <linux/stddef.h> 30 31 #include <linux/inet_diag.h> 32 #include <linux/sock_diag.h> 33 34 static const struct inet_diag_handler **inet_diag_table; 35 36 struct inet_diag_entry { 37 const __be32 *saddr; 38 const __be32 *daddr; 39 u16 sport; 40 u16 dport; 41 u16 family; 42 u16 userlocks; 43 u32 ifindex; 44 u32 mark; 45 }; 46 47 static DEFINE_MUTEX(inet_diag_table_mutex); 48 49 static const struct inet_diag_handler *inet_diag_lock_handler(int proto) 50 { 51 if (!inet_diag_table[proto]) 52 sock_load_diag_module(AF_INET, proto); 53 54 mutex_lock(&inet_diag_table_mutex); 55 if (!inet_diag_table[proto]) 56 return ERR_PTR(-ENOENT); 57 58 return inet_diag_table[proto]; 59 } 60 61 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler) 62 { 63 mutex_unlock(&inet_diag_table_mutex); 64 } 65 66 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk) 67 { 68 r->idiag_family = sk->sk_family; 69 70 r->id.idiag_sport = htons(sk->sk_num); 71 r->id.idiag_dport = sk->sk_dport; 72 r->id.idiag_if = sk->sk_bound_dev_if; 73 sock_diag_save_cookie(sk, r->id.idiag_cookie); 74 75 #if IS_ENABLED(CONFIG_IPV6) 76 if (sk->sk_family == AF_INET6) { 77 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr; 78 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr; 79 } else 80 #endif 81 { 82 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src)); 83 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst)); 84 85 r->id.idiag_src[0] = sk->sk_rcv_saddr; 86 r->id.idiag_dst[0] = sk->sk_daddr; 87 } 88 } 89 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill); 90 91 static size_t inet_sk_attr_size(struct sock *sk, 92 const struct inet_diag_req_v2 *req, 93 bool net_admin) 94 { 95 const struct inet_diag_handler *handler; 96 size_t aux = 0; 97 98 handler = inet_diag_table[req->sdiag_protocol]; 99 if (handler && handler->idiag_get_aux_size) 100 aux = handler->idiag_get_aux_size(sk, net_admin); 101 102 return nla_total_size(sizeof(struct tcp_info)) 103 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */ 104 + nla_total_size(1) /* INET_DIAG_TOS */ 105 + nla_total_size(1) /* INET_DIAG_TCLASS */ 106 + nla_total_size(4) /* INET_DIAG_MARK */ 107 + nla_total_size(4) /* INET_DIAG_CLASS_ID */ 108 + nla_total_size(sizeof(struct inet_diag_meminfo)) 109 + nla_total_size(sizeof(struct inet_diag_msg)) 110 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32)) 111 + nla_total_size(TCP_CA_NAME_MAX) 112 + nla_total_size(sizeof(struct tcpvegas_info)) 113 + aux 114 + 64; 115 } 116 117 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb, 118 struct inet_diag_msg *r, int ext, 119 struct user_namespace *user_ns, 120 bool net_admin) 121 { 122 const struct inet_sock *inet = inet_sk(sk); 123 124 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown)) 125 goto errout; 126 127 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, 128 * hence this needs to be included regardless of socket family. 129 */ 130 if (ext & (1 << (INET_DIAG_TOS - 1))) 131 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0) 132 goto errout; 133 134 #if IS_ENABLED(CONFIG_IPV6) 135 if (r->idiag_family == AF_INET6) { 136 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 137 if (nla_put_u8(skb, INET_DIAG_TCLASS, 138 inet6_sk(sk)->tclass) < 0) 139 goto errout; 140 141 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && 142 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk))) 143 goto errout; 144 } 145 #endif 146 147 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark)) 148 goto errout; 149 150 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); 151 r->idiag_inode = sock_i_ino(sk); 152 153 return 0; 154 errout: 155 return 1; 156 } 157 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill); 158 159 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, 160 struct sk_buff *skb, const struct inet_diag_req_v2 *req, 161 struct user_namespace *user_ns, 162 u32 portid, u32 seq, u16 nlmsg_flags, 163 const struct nlmsghdr *unlh, 164 bool net_admin) 165 { 166 const struct tcp_congestion_ops *ca_ops; 167 const struct inet_diag_handler *handler; 168 int ext = req->idiag_ext; 169 struct inet_diag_msg *r; 170 struct nlmsghdr *nlh; 171 struct nlattr *attr; 172 void *info = NULL; 173 174 handler = inet_diag_table[req->sdiag_protocol]; 175 BUG_ON(!handler); 176 177 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 178 nlmsg_flags); 179 if (!nlh) 180 return -EMSGSIZE; 181 182 r = nlmsg_data(nlh); 183 BUG_ON(!sk_fullsock(sk)); 184 185 inet_diag_msg_common_fill(r, sk); 186 r->idiag_state = sk->sk_state; 187 r->idiag_timer = 0; 188 r->idiag_retrans = 0; 189 190 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin)) 191 goto errout; 192 193 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) { 194 struct inet_diag_meminfo minfo = { 195 .idiag_rmem = sk_rmem_alloc_get(sk), 196 .idiag_wmem = READ_ONCE(sk->sk_wmem_queued), 197 .idiag_fmem = sk->sk_forward_alloc, 198 .idiag_tmem = sk_wmem_alloc_get(sk), 199 }; 200 201 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0) 202 goto errout; 203 } 204 205 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) 206 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO)) 207 goto errout; 208 209 /* 210 * RAW sockets might have user-defined protocols assigned, 211 * so report the one supplied on socket creation. 212 */ 213 if (sk->sk_type == SOCK_RAW) { 214 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol)) 215 goto errout; 216 } 217 218 if (!icsk) { 219 handler->idiag_get_info(sk, r, NULL); 220 goto out; 221 } 222 223 if (icsk->icsk_pending == ICSK_TIME_RETRANS || 224 icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT || 225 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { 226 r->idiag_timer = 1; 227 r->idiag_retrans = icsk->icsk_retransmits; 228 r->idiag_expires = 229 jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies); 230 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 231 r->idiag_timer = 4; 232 r->idiag_retrans = icsk->icsk_probes_out; 233 r->idiag_expires = 234 jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies); 235 } else if (timer_pending(&sk->sk_timer)) { 236 r->idiag_timer = 2; 237 r->idiag_retrans = icsk->icsk_probes_out; 238 r->idiag_expires = 239 jiffies_delta_to_msecs(sk->sk_timer.expires - jiffies); 240 } else { 241 r->idiag_timer = 0; 242 r->idiag_expires = 0; 243 } 244 245 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) { 246 attr = nla_reserve_64bit(skb, INET_DIAG_INFO, 247 handler->idiag_info_size, 248 INET_DIAG_PAD); 249 if (!attr) 250 goto errout; 251 252 info = nla_data(attr); 253 } 254 255 if (ext & (1 << (INET_DIAG_CONG - 1))) { 256 int err = 0; 257 258 rcu_read_lock(); 259 ca_ops = READ_ONCE(icsk->icsk_ca_ops); 260 if (ca_ops) 261 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name); 262 rcu_read_unlock(); 263 if (err < 0) 264 goto errout; 265 } 266 267 handler->idiag_get_info(sk, r, info); 268 269 if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux) 270 if (handler->idiag_get_aux(sk, net_admin, skb) < 0) 271 goto errout; 272 273 if (sk->sk_state < TCP_TIME_WAIT) { 274 union tcp_cc_info info; 275 size_t sz = 0; 276 int attr; 277 278 rcu_read_lock(); 279 ca_ops = READ_ONCE(icsk->icsk_ca_ops); 280 if (ca_ops && ca_ops->get_info) 281 sz = ca_ops->get_info(sk, ext, &attr, &info); 282 rcu_read_unlock(); 283 if (sz && nla_put(skb, attr, sz, &info) < 0) 284 goto errout; 285 } 286 287 if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) || 288 ext & (1 << (INET_DIAG_TCLASS - 1))) { 289 u32 classid = 0; 290 291 #ifdef CONFIG_SOCK_CGROUP_DATA 292 classid = sock_cgroup_classid(&sk->sk_cgrp_data); 293 #endif 294 /* Fallback to socket priority if class id isn't set. 295 * Classful qdiscs use it as direct reference to class. 296 * For cgroup2 classid is always zero. 297 */ 298 if (!classid) 299 classid = sk->sk_priority; 300 301 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid)) 302 goto errout; 303 } 304 305 out: 306 nlmsg_end(skb, nlh); 307 return 0; 308 309 errout: 310 nlmsg_cancel(skb, nlh); 311 return -EMSGSIZE; 312 } 313 EXPORT_SYMBOL_GPL(inet_sk_diag_fill); 314 315 static int inet_csk_diag_fill(struct sock *sk, 316 struct sk_buff *skb, 317 const struct inet_diag_req_v2 *req, 318 struct user_namespace *user_ns, 319 u32 portid, u32 seq, u16 nlmsg_flags, 320 const struct nlmsghdr *unlh, 321 bool net_admin) 322 { 323 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns, 324 portid, seq, nlmsg_flags, unlh, net_admin); 325 } 326 327 static int inet_twsk_diag_fill(struct sock *sk, 328 struct sk_buff *skb, 329 u32 portid, u32 seq, u16 nlmsg_flags, 330 const struct nlmsghdr *unlh) 331 { 332 struct inet_timewait_sock *tw = inet_twsk(sk); 333 struct inet_diag_msg *r; 334 struct nlmsghdr *nlh; 335 long tmo; 336 337 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 338 nlmsg_flags); 339 if (!nlh) 340 return -EMSGSIZE; 341 342 r = nlmsg_data(nlh); 343 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 344 345 inet_diag_msg_common_fill(r, sk); 346 r->idiag_retrans = 0; 347 348 r->idiag_state = tw->tw_substate; 349 r->idiag_timer = 3; 350 tmo = tw->tw_timer.expires - jiffies; 351 r->idiag_expires = jiffies_delta_to_msecs(tmo); 352 r->idiag_rqueue = 0; 353 r->idiag_wqueue = 0; 354 r->idiag_uid = 0; 355 r->idiag_inode = 0; 356 357 nlmsg_end(skb, nlh); 358 return 0; 359 } 360 361 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb, 362 u32 portid, u32 seq, u16 nlmsg_flags, 363 const struct nlmsghdr *unlh, bool net_admin) 364 { 365 struct request_sock *reqsk = inet_reqsk(sk); 366 struct inet_diag_msg *r; 367 struct nlmsghdr *nlh; 368 long tmo; 369 370 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 371 nlmsg_flags); 372 if (!nlh) 373 return -EMSGSIZE; 374 375 r = nlmsg_data(nlh); 376 inet_diag_msg_common_fill(r, sk); 377 r->idiag_state = TCP_SYN_RECV; 378 r->idiag_timer = 1; 379 r->idiag_retrans = reqsk->num_retrans; 380 381 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) != 382 offsetof(struct sock, sk_cookie)); 383 384 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies; 385 r->idiag_expires = jiffies_delta_to_msecs(tmo); 386 r->idiag_rqueue = 0; 387 r->idiag_wqueue = 0; 388 r->idiag_uid = 0; 389 r->idiag_inode = 0; 390 391 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, 392 inet_rsk(reqsk)->ir_mark)) 393 return -EMSGSIZE; 394 395 nlmsg_end(skb, nlh); 396 return 0; 397 } 398 399 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 400 const struct inet_diag_req_v2 *r, 401 struct user_namespace *user_ns, 402 u32 portid, u32 seq, u16 nlmsg_flags, 403 const struct nlmsghdr *unlh, bool net_admin) 404 { 405 if (sk->sk_state == TCP_TIME_WAIT) 406 return inet_twsk_diag_fill(sk, skb, portid, seq, 407 nlmsg_flags, unlh); 408 409 if (sk->sk_state == TCP_NEW_SYN_RECV) 410 return inet_req_diag_fill(sk, skb, portid, seq, 411 nlmsg_flags, unlh, net_admin); 412 413 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, 414 nlmsg_flags, unlh, net_admin); 415 } 416 417 struct sock *inet_diag_find_one_icsk(struct net *net, 418 struct inet_hashinfo *hashinfo, 419 const struct inet_diag_req_v2 *req) 420 { 421 struct sock *sk; 422 423 rcu_read_lock(); 424 if (req->sdiag_family == AF_INET) 425 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0], 426 req->id.idiag_dport, req->id.idiag_src[0], 427 req->id.idiag_sport, req->id.idiag_if); 428 #if IS_ENABLED(CONFIG_IPV6) 429 else if (req->sdiag_family == AF_INET6) { 430 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) && 431 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src)) 432 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3], 433 req->id.idiag_dport, req->id.idiag_src[3], 434 req->id.idiag_sport, req->id.idiag_if); 435 else 436 sk = inet6_lookup(net, hashinfo, NULL, 0, 437 (struct in6_addr *)req->id.idiag_dst, 438 req->id.idiag_dport, 439 (struct in6_addr *)req->id.idiag_src, 440 req->id.idiag_sport, 441 req->id.idiag_if); 442 } 443 #endif 444 else { 445 rcu_read_unlock(); 446 return ERR_PTR(-EINVAL); 447 } 448 rcu_read_unlock(); 449 if (!sk) 450 return ERR_PTR(-ENOENT); 451 452 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) { 453 sock_gen_put(sk); 454 return ERR_PTR(-ENOENT); 455 } 456 457 return sk; 458 } 459 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk); 460 461 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, 462 struct sk_buff *in_skb, 463 const struct nlmsghdr *nlh, 464 const struct inet_diag_req_v2 *req) 465 { 466 bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN); 467 struct net *net = sock_net(in_skb->sk); 468 struct sk_buff *rep; 469 struct sock *sk; 470 int err; 471 472 sk = inet_diag_find_one_icsk(net, hashinfo, req); 473 if (IS_ERR(sk)) 474 return PTR_ERR(sk); 475 476 rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL); 477 if (!rep) { 478 err = -ENOMEM; 479 goto out; 480 } 481 482 err = sk_diag_fill(sk, rep, req, 483 sk_user_ns(NETLINK_CB(in_skb).sk), 484 NETLINK_CB(in_skb).portid, 485 nlh->nlmsg_seq, 0, nlh, net_admin); 486 if (err < 0) { 487 WARN_ON(err == -EMSGSIZE); 488 nlmsg_free(rep); 489 goto out; 490 } 491 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid, 492 MSG_DONTWAIT); 493 if (err > 0) 494 err = 0; 495 496 out: 497 if (sk) 498 sock_gen_put(sk); 499 500 return err; 501 } 502 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk); 503 504 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb, 505 const struct nlmsghdr *nlh, 506 const struct inet_diag_req_v2 *req) 507 { 508 const struct inet_diag_handler *handler; 509 int err; 510 511 handler = inet_diag_lock_handler(req->sdiag_protocol); 512 if (IS_ERR(handler)) 513 err = PTR_ERR(handler); 514 else if (cmd == SOCK_DIAG_BY_FAMILY) 515 err = handler->dump_one(in_skb, nlh, req); 516 else if (cmd == SOCK_DESTROY && handler->destroy) 517 err = handler->destroy(in_skb, req); 518 else 519 err = -EOPNOTSUPP; 520 inet_diag_unlock_handler(handler); 521 522 return err; 523 } 524 525 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 526 { 527 int words = bits >> 5; 528 529 bits &= 0x1f; 530 531 if (words) { 532 if (memcmp(a1, a2, words << 2)) 533 return 0; 534 } 535 if (bits) { 536 __be32 w1, w2; 537 __be32 mask; 538 539 w1 = a1[words]; 540 w2 = a2[words]; 541 542 mask = htonl((0xffffffff) << (32 - bits)); 543 544 if ((w1 ^ w2) & mask) 545 return 0; 546 } 547 548 return 1; 549 } 550 551 static int inet_diag_bc_run(const struct nlattr *_bc, 552 const struct inet_diag_entry *entry) 553 { 554 const void *bc = nla_data(_bc); 555 int len = nla_len(_bc); 556 557 while (len > 0) { 558 int yes = 1; 559 const struct inet_diag_bc_op *op = bc; 560 561 switch (op->code) { 562 case INET_DIAG_BC_NOP: 563 break; 564 case INET_DIAG_BC_JMP: 565 yes = 0; 566 break; 567 case INET_DIAG_BC_S_EQ: 568 yes = entry->sport == op[1].no; 569 break; 570 case INET_DIAG_BC_S_GE: 571 yes = entry->sport >= op[1].no; 572 break; 573 case INET_DIAG_BC_S_LE: 574 yes = entry->sport <= op[1].no; 575 break; 576 case INET_DIAG_BC_D_EQ: 577 yes = entry->dport == op[1].no; 578 break; 579 case INET_DIAG_BC_D_GE: 580 yes = entry->dport >= op[1].no; 581 break; 582 case INET_DIAG_BC_D_LE: 583 yes = entry->dport <= op[1].no; 584 break; 585 case INET_DIAG_BC_AUTO: 586 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 587 break; 588 case INET_DIAG_BC_S_COND: 589 case INET_DIAG_BC_D_COND: { 590 const struct inet_diag_hostcond *cond; 591 const __be32 *addr; 592 593 cond = (const struct inet_diag_hostcond *)(op + 1); 594 if (cond->port != -1 && 595 cond->port != (op->code == INET_DIAG_BC_S_COND ? 596 entry->sport : entry->dport)) { 597 yes = 0; 598 break; 599 } 600 601 if (op->code == INET_DIAG_BC_S_COND) 602 addr = entry->saddr; 603 else 604 addr = entry->daddr; 605 606 if (cond->family != AF_UNSPEC && 607 cond->family != entry->family) { 608 if (entry->family == AF_INET6 && 609 cond->family == AF_INET) { 610 if (addr[0] == 0 && addr[1] == 0 && 611 addr[2] == htonl(0xffff) && 612 bitstring_match(addr + 3, 613 cond->addr, 614 cond->prefix_len)) 615 break; 616 } 617 yes = 0; 618 break; 619 } 620 621 if (cond->prefix_len == 0) 622 break; 623 if (bitstring_match(addr, cond->addr, 624 cond->prefix_len)) 625 break; 626 yes = 0; 627 break; 628 } 629 case INET_DIAG_BC_DEV_COND: { 630 u32 ifindex; 631 632 ifindex = *((const u32 *)(op + 1)); 633 if (ifindex != entry->ifindex) 634 yes = 0; 635 break; 636 } 637 case INET_DIAG_BC_MARK_COND: { 638 struct inet_diag_markcond *cond; 639 640 cond = (struct inet_diag_markcond *)(op + 1); 641 if ((entry->mark & cond->mask) != cond->mark) 642 yes = 0; 643 break; 644 } 645 } 646 647 if (yes) { 648 len -= op->yes; 649 bc += op->yes; 650 } else { 651 len -= op->no; 652 bc += op->no; 653 } 654 } 655 return len == 0; 656 } 657 658 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV) 659 */ 660 static void entry_fill_addrs(struct inet_diag_entry *entry, 661 const struct sock *sk) 662 { 663 #if IS_ENABLED(CONFIG_IPV6) 664 if (sk->sk_family == AF_INET6) { 665 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32; 666 entry->daddr = sk->sk_v6_daddr.s6_addr32; 667 } else 668 #endif 669 { 670 entry->saddr = &sk->sk_rcv_saddr; 671 entry->daddr = &sk->sk_daddr; 672 } 673 } 674 675 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) 676 { 677 struct inet_sock *inet = inet_sk(sk); 678 struct inet_diag_entry entry; 679 680 if (!bc) 681 return 1; 682 683 entry.family = sk->sk_family; 684 entry_fill_addrs(&entry, sk); 685 entry.sport = inet->inet_num; 686 entry.dport = ntohs(inet->inet_dport); 687 entry.ifindex = sk->sk_bound_dev_if; 688 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0; 689 if (sk_fullsock(sk)) 690 entry.mark = sk->sk_mark; 691 else if (sk->sk_state == TCP_NEW_SYN_RECV) 692 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark; 693 else 694 entry.mark = 0; 695 696 return inet_diag_bc_run(bc, &entry); 697 } 698 EXPORT_SYMBOL_GPL(inet_diag_bc_sk); 699 700 static int valid_cc(const void *bc, int len, int cc) 701 { 702 while (len >= 0) { 703 const struct inet_diag_bc_op *op = bc; 704 705 if (cc > len) 706 return 0; 707 if (cc == len) 708 return 1; 709 if (op->yes < 4 || op->yes & 3) 710 return 0; 711 len -= op->yes; 712 bc += op->yes; 713 } 714 return 0; 715 } 716 717 /* data is u32 ifindex */ 718 static bool valid_devcond(const struct inet_diag_bc_op *op, int len, 719 int *min_len) 720 { 721 /* Check ifindex space. */ 722 *min_len += sizeof(u32); 723 if (len < *min_len) 724 return false; 725 726 return true; 727 } 728 /* Validate an inet_diag_hostcond. */ 729 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len, 730 int *min_len) 731 { 732 struct inet_diag_hostcond *cond; 733 int addr_len; 734 735 /* Check hostcond space. */ 736 *min_len += sizeof(struct inet_diag_hostcond); 737 if (len < *min_len) 738 return false; 739 cond = (struct inet_diag_hostcond *)(op + 1); 740 741 /* Check address family and address length. */ 742 switch (cond->family) { 743 case AF_UNSPEC: 744 addr_len = 0; 745 break; 746 case AF_INET: 747 addr_len = sizeof(struct in_addr); 748 break; 749 case AF_INET6: 750 addr_len = sizeof(struct in6_addr); 751 break; 752 default: 753 return false; 754 } 755 *min_len += addr_len; 756 if (len < *min_len) 757 return false; 758 759 /* Check prefix length (in bits) vs address length (in bytes). */ 760 if (cond->prefix_len > 8 * addr_len) 761 return false; 762 763 return true; 764 } 765 766 /* Validate a port comparison operator. */ 767 static bool valid_port_comparison(const struct inet_diag_bc_op *op, 768 int len, int *min_len) 769 { 770 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */ 771 *min_len += sizeof(struct inet_diag_bc_op); 772 if (len < *min_len) 773 return false; 774 return true; 775 } 776 777 static bool valid_markcond(const struct inet_diag_bc_op *op, int len, 778 int *min_len) 779 { 780 *min_len += sizeof(struct inet_diag_markcond); 781 return len >= *min_len; 782 } 783 784 static int inet_diag_bc_audit(const struct nlattr *attr, 785 const struct sk_buff *skb) 786 { 787 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN); 788 const void *bytecode, *bc; 789 int bytecode_len, len; 790 791 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op)) 792 return -EINVAL; 793 794 bytecode = bc = nla_data(attr); 795 len = bytecode_len = nla_len(attr); 796 797 while (len > 0) { 798 int min_len = sizeof(struct inet_diag_bc_op); 799 const struct inet_diag_bc_op *op = bc; 800 801 switch (op->code) { 802 case INET_DIAG_BC_S_COND: 803 case INET_DIAG_BC_D_COND: 804 if (!valid_hostcond(bc, len, &min_len)) 805 return -EINVAL; 806 break; 807 case INET_DIAG_BC_DEV_COND: 808 if (!valid_devcond(bc, len, &min_len)) 809 return -EINVAL; 810 break; 811 case INET_DIAG_BC_S_EQ: 812 case INET_DIAG_BC_S_GE: 813 case INET_DIAG_BC_S_LE: 814 case INET_DIAG_BC_D_EQ: 815 case INET_DIAG_BC_D_GE: 816 case INET_DIAG_BC_D_LE: 817 if (!valid_port_comparison(bc, len, &min_len)) 818 return -EINVAL; 819 break; 820 case INET_DIAG_BC_MARK_COND: 821 if (!net_admin) 822 return -EPERM; 823 if (!valid_markcond(bc, len, &min_len)) 824 return -EINVAL; 825 break; 826 case INET_DIAG_BC_AUTO: 827 case INET_DIAG_BC_JMP: 828 case INET_DIAG_BC_NOP: 829 break; 830 default: 831 return -EINVAL; 832 } 833 834 if (op->code != INET_DIAG_BC_NOP) { 835 if (op->no < min_len || op->no > len + 4 || op->no & 3) 836 return -EINVAL; 837 if (op->no < len && 838 !valid_cc(bytecode, bytecode_len, len - op->no)) 839 return -EINVAL; 840 } 841 842 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3) 843 return -EINVAL; 844 bc += op->yes; 845 len -= op->yes; 846 } 847 return len == 0 ? 0 : -EINVAL; 848 } 849 850 static int inet_csk_diag_dump(struct sock *sk, 851 struct sk_buff *skb, 852 struct netlink_callback *cb, 853 const struct inet_diag_req_v2 *r, 854 const struct nlattr *bc, 855 bool net_admin) 856 { 857 if (!inet_diag_bc_sk(bc, sk)) 858 return 0; 859 860 return inet_csk_diag_fill(sk, skb, r, 861 sk_user_ns(NETLINK_CB(cb->skb).sk), 862 NETLINK_CB(cb->skb).portid, 863 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh, 864 net_admin); 865 } 866 867 static void twsk_build_assert(void) 868 { 869 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) != 870 offsetof(struct sock, sk_family)); 871 872 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) != 873 offsetof(struct inet_sock, inet_num)); 874 875 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) != 876 offsetof(struct inet_sock, inet_dport)); 877 878 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) != 879 offsetof(struct inet_sock, inet_rcv_saddr)); 880 881 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) != 882 offsetof(struct inet_sock, inet_daddr)); 883 884 #if IS_ENABLED(CONFIG_IPV6) 885 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) != 886 offsetof(struct sock, sk_v6_rcv_saddr)); 887 888 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) != 889 offsetof(struct sock, sk_v6_daddr)); 890 #endif 891 } 892 893 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, 894 struct netlink_callback *cb, 895 const struct inet_diag_req_v2 *r, struct nlattr *bc) 896 { 897 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN); 898 struct net *net = sock_net(skb->sk); 899 u32 idiag_states = r->idiag_states; 900 int i, num, s_i, s_num; 901 struct sock *sk; 902 903 if (idiag_states & TCPF_SYN_RECV) 904 idiag_states |= TCPF_NEW_SYN_RECV; 905 s_i = cb->args[1]; 906 s_num = num = cb->args[2]; 907 908 if (cb->args[0] == 0) { 909 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport) 910 goto skip_listen_ht; 911 912 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 913 struct inet_listen_hashbucket *ilb; 914 struct hlist_nulls_node *node; 915 916 num = 0; 917 ilb = &hashinfo->listening_hash[i]; 918 spin_lock(&ilb->lock); 919 sk_nulls_for_each(sk, node, &ilb->nulls_head) { 920 struct inet_sock *inet = inet_sk(sk); 921 922 if (!net_eq(sock_net(sk), net)) 923 continue; 924 925 if (num < s_num) { 926 num++; 927 continue; 928 } 929 930 if (r->sdiag_family != AF_UNSPEC && 931 sk->sk_family != r->sdiag_family) 932 goto next_listen; 933 934 if (r->id.idiag_sport != inet->inet_sport && 935 r->id.idiag_sport) 936 goto next_listen; 937 938 if (inet_csk_diag_dump(sk, skb, cb, r, 939 bc, net_admin) < 0) { 940 spin_unlock(&ilb->lock); 941 goto done; 942 } 943 944 next_listen: 945 ++num; 946 } 947 spin_unlock(&ilb->lock); 948 949 s_num = 0; 950 } 951 skip_listen_ht: 952 cb->args[0] = 1; 953 s_i = num = s_num = 0; 954 } 955 956 if (!(idiag_states & ~TCPF_LISTEN)) 957 goto out; 958 959 #define SKARR_SZ 16 960 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 961 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 962 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 963 struct hlist_nulls_node *node; 964 struct sock *sk_arr[SKARR_SZ]; 965 int num_arr[SKARR_SZ]; 966 int idx, accum, res; 967 968 if (hlist_nulls_empty(&head->chain)) 969 continue; 970 971 if (i > s_i) 972 s_num = 0; 973 974 next_chunk: 975 num = 0; 976 accum = 0; 977 spin_lock_bh(lock); 978 sk_nulls_for_each(sk, node, &head->chain) { 979 int state; 980 981 if (!net_eq(sock_net(sk), net)) 982 continue; 983 if (num < s_num) 984 goto next_normal; 985 state = (sk->sk_state == TCP_TIME_WAIT) ? 986 inet_twsk(sk)->tw_substate : sk->sk_state; 987 if (!(idiag_states & (1 << state))) 988 goto next_normal; 989 if (r->sdiag_family != AF_UNSPEC && 990 sk->sk_family != r->sdiag_family) 991 goto next_normal; 992 if (r->id.idiag_sport != htons(sk->sk_num) && 993 r->id.idiag_sport) 994 goto next_normal; 995 if (r->id.idiag_dport != sk->sk_dport && 996 r->id.idiag_dport) 997 goto next_normal; 998 twsk_build_assert(); 999 1000 if (!inet_diag_bc_sk(bc, sk)) 1001 goto next_normal; 1002 1003 if (!refcount_inc_not_zero(&sk->sk_refcnt)) 1004 goto next_normal; 1005 1006 num_arr[accum] = num; 1007 sk_arr[accum] = sk; 1008 if (++accum == SKARR_SZ) 1009 break; 1010 next_normal: 1011 ++num; 1012 } 1013 spin_unlock_bh(lock); 1014 res = 0; 1015 for (idx = 0; idx < accum; idx++) { 1016 if (res >= 0) { 1017 res = sk_diag_fill(sk_arr[idx], skb, r, 1018 sk_user_ns(NETLINK_CB(cb->skb).sk), 1019 NETLINK_CB(cb->skb).portid, 1020 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1021 cb->nlh, net_admin); 1022 if (res < 0) 1023 num = num_arr[idx]; 1024 } 1025 sock_gen_put(sk_arr[idx]); 1026 } 1027 if (res < 0) 1028 break; 1029 cond_resched(); 1030 if (accum == SKARR_SZ) { 1031 s_num = num + 1; 1032 goto next_chunk; 1033 } 1034 } 1035 1036 done: 1037 cb->args[1] = i; 1038 cb->args[2] = num; 1039 out: 1040 ; 1041 } 1042 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk); 1043 1044 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 1045 const struct inet_diag_req_v2 *r, 1046 struct nlattr *bc) 1047 { 1048 const struct inet_diag_handler *handler; 1049 int err = 0; 1050 1051 handler = inet_diag_lock_handler(r->sdiag_protocol); 1052 if (!IS_ERR(handler)) 1053 handler->dump(skb, cb, r, bc); 1054 else 1055 err = PTR_ERR(handler); 1056 inet_diag_unlock_handler(handler); 1057 1058 return err ? : skb->len; 1059 } 1060 1061 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 1062 { 1063 int hdrlen = sizeof(struct inet_diag_req_v2); 1064 struct nlattr *bc = NULL; 1065 1066 if (nlmsg_attrlen(cb->nlh, hdrlen)) 1067 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 1068 1069 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc); 1070 } 1071 1072 static int inet_diag_type2proto(int type) 1073 { 1074 switch (type) { 1075 case TCPDIAG_GETSOCK: 1076 return IPPROTO_TCP; 1077 case DCCPDIAG_GETSOCK: 1078 return IPPROTO_DCCP; 1079 default: 1080 return 0; 1081 } 1082 } 1083 1084 static int inet_diag_dump_compat(struct sk_buff *skb, 1085 struct netlink_callback *cb) 1086 { 1087 struct inet_diag_req *rc = nlmsg_data(cb->nlh); 1088 int hdrlen = sizeof(struct inet_diag_req); 1089 struct inet_diag_req_v2 req; 1090 struct nlattr *bc = NULL; 1091 1092 req.sdiag_family = AF_UNSPEC; /* compatibility */ 1093 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 1094 req.idiag_ext = rc->idiag_ext; 1095 req.idiag_states = rc->idiag_states; 1096 req.id = rc->id; 1097 1098 if (nlmsg_attrlen(cb->nlh, hdrlen)) 1099 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 1100 1101 return __inet_diag_dump(skb, cb, &req, bc); 1102 } 1103 1104 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 1105 const struct nlmsghdr *nlh) 1106 { 1107 struct inet_diag_req *rc = nlmsg_data(nlh); 1108 struct inet_diag_req_v2 req; 1109 1110 req.sdiag_family = rc->idiag_family; 1111 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 1112 req.idiag_ext = rc->idiag_ext; 1113 req.idiag_states = rc->idiag_states; 1114 req.id = rc->id; 1115 1116 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req); 1117 } 1118 1119 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 1120 { 1121 int hdrlen = sizeof(struct inet_diag_req); 1122 struct net *net = sock_net(skb->sk); 1123 1124 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 1125 nlmsg_len(nlh) < hdrlen) 1126 return -EINVAL; 1127 1128 if (nlh->nlmsg_flags & NLM_F_DUMP) { 1129 if (nlmsg_attrlen(nlh, hdrlen)) { 1130 struct nlattr *attr; 1131 int err; 1132 1133 attr = nlmsg_find_attr(nlh, hdrlen, 1134 INET_DIAG_REQ_BYTECODE); 1135 err = inet_diag_bc_audit(attr, skb); 1136 if (err) 1137 return err; 1138 } 1139 { 1140 struct netlink_dump_control c = { 1141 .dump = inet_diag_dump_compat, 1142 }; 1143 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c); 1144 } 1145 } 1146 1147 return inet_diag_get_exact_compat(skb, nlh); 1148 } 1149 1150 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h) 1151 { 1152 int hdrlen = sizeof(struct inet_diag_req_v2); 1153 struct net *net = sock_net(skb->sk); 1154 1155 if (nlmsg_len(h) < hdrlen) 1156 return -EINVAL; 1157 1158 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY && 1159 h->nlmsg_flags & NLM_F_DUMP) { 1160 if (nlmsg_attrlen(h, hdrlen)) { 1161 struct nlattr *attr; 1162 int err; 1163 1164 attr = nlmsg_find_attr(h, hdrlen, 1165 INET_DIAG_REQ_BYTECODE); 1166 err = inet_diag_bc_audit(attr, skb); 1167 if (err) 1168 return err; 1169 } 1170 { 1171 struct netlink_dump_control c = { 1172 .dump = inet_diag_dump, 1173 }; 1174 return netlink_dump_start(net->diag_nlsk, skb, h, &c); 1175 } 1176 } 1177 1178 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h)); 1179 } 1180 1181 static 1182 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk) 1183 { 1184 const struct inet_diag_handler *handler; 1185 struct nlmsghdr *nlh; 1186 struct nlattr *attr; 1187 struct inet_diag_msg *r; 1188 void *info = NULL; 1189 int err = 0; 1190 1191 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0); 1192 if (!nlh) 1193 return -ENOMEM; 1194 1195 r = nlmsg_data(nlh); 1196 memset(r, 0, sizeof(*r)); 1197 inet_diag_msg_common_fill(r, sk); 1198 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM) 1199 r->id.idiag_sport = inet_sk(sk)->inet_sport; 1200 r->idiag_state = sk->sk_state; 1201 1202 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) { 1203 nlmsg_cancel(skb, nlh); 1204 return err; 1205 } 1206 1207 handler = inet_diag_lock_handler(sk->sk_protocol); 1208 if (IS_ERR(handler)) { 1209 inet_diag_unlock_handler(handler); 1210 nlmsg_cancel(skb, nlh); 1211 return PTR_ERR(handler); 1212 } 1213 1214 attr = handler->idiag_info_size 1215 ? nla_reserve_64bit(skb, INET_DIAG_INFO, 1216 handler->idiag_info_size, 1217 INET_DIAG_PAD) 1218 : NULL; 1219 if (attr) 1220 info = nla_data(attr); 1221 1222 handler->idiag_get_info(sk, r, info); 1223 inet_diag_unlock_handler(handler); 1224 1225 nlmsg_end(skb, nlh); 1226 return 0; 1227 } 1228 1229 static const struct sock_diag_handler inet_diag_handler = { 1230 .family = AF_INET, 1231 .dump = inet_diag_handler_cmd, 1232 .get_info = inet_diag_handler_get_info, 1233 .destroy = inet_diag_handler_cmd, 1234 }; 1235 1236 static const struct sock_diag_handler inet6_diag_handler = { 1237 .family = AF_INET6, 1238 .dump = inet_diag_handler_cmd, 1239 .get_info = inet_diag_handler_get_info, 1240 .destroy = inet_diag_handler_cmd, 1241 }; 1242 1243 int inet_diag_register(const struct inet_diag_handler *h) 1244 { 1245 const __u16 type = h->idiag_type; 1246 int err = -EINVAL; 1247 1248 if (type >= IPPROTO_MAX) 1249 goto out; 1250 1251 mutex_lock(&inet_diag_table_mutex); 1252 err = -EEXIST; 1253 if (!inet_diag_table[type]) { 1254 inet_diag_table[type] = h; 1255 err = 0; 1256 } 1257 mutex_unlock(&inet_diag_table_mutex); 1258 out: 1259 return err; 1260 } 1261 EXPORT_SYMBOL_GPL(inet_diag_register); 1262 1263 void inet_diag_unregister(const struct inet_diag_handler *h) 1264 { 1265 const __u16 type = h->idiag_type; 1266 1267 if (type >= IPPROTO_MAX) 1268 return; 1269 1270 mutex_lock(&inet_diag_table_mutex); 1271 inet_diag_table[type] = NULL; 1272 mutex_unlock(&inet_diag_table_mutex); 1273 } 1274 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1275 1276 static int __init inet_diag_init(void) 1277 { 1278 const int inet_diag_table_size = (IPPROTO_MAX * 1279 sizeof(struct inet_diag_handler *)); 1280 int err = -ENOMEM; 1281 1282 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1283 if (!inet_diag_table) 1284 goto out; 1285 1286 err = sock_diag_register(&inet_diag_handler); 1287 if (err) 1288 goto out_free_nl; 1289 1290 err = sock_diag_register(&inet6_diag_handler); 1291 if (err) 1292 goto out_free_inet; 1293 1294 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1295 out: 1296 return err; 1297 1298 out_free_inet: 1299 sock_diag_unregister(&inet_diag_handler); 1300 out_free_nl: 1301 kfree(inet_diag_table); 1302 goto out; 1303 } 1304 1305 static void __exit inet_diag_exit(void) 1306 { 1307 sock_diag_unregister(&inet6_diag_handler); 1308 sock_diag_unregister(&inet_diag_handler); 1309 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1310 kfree(inet_diag_table); 1311 } 1312 1313 module_init(inet_diag_init); 1314 module_exit(inet_diag_exit); 1315 MODULE_LICENSE("GPL"); 1316 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */); 1317 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */); 1318