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/bpf_sk_storage.h> 27 #include <net/netlink.h> 28 29 #include <linux/inet.h> 30 #include <linux/stddef.h> 31 32 #include <linux/inet_diag.h> 33 #include <linux/sock_diag.h> 34 35 static const struct inet_diag_handler **inet_diag_table; 36 37 struct inet_diag_entry { 38 const __be32 *saddr; 39 const __be32 *daddr; 40 u16 sport; 41 u16 dport; 42 u16 family; 43 u16 userlocks; 44 u32 ifindex; 45 u32 mark; 46 #ifdef CONFIG_SOCK_CGROUP_DATA 47 u64 cgroup_id; 48 #endif 49 }; 50 51 static DEFINE_MUTEX(inet_diag_table_mutex); 52 53 static const struct inet_diag_handler *inet_diag_lock_handler(int proto) 54 { 55 if (proto < 0 || proto >= IPPROTO_MAX) { 56 mutex_lock(&inet_diag_table_mutex); 57 return ERR_PTR(-ENOENT); 58 } 59 60 if (!inet_diag_table[proto]) 61 sock_load_diag_module(AF_INET, proto); 62 63 mutex_lock(&inet_diag_table_mutex); 64 if (!inet_diag_table[proto]) 65 return ERR_PTR(-ENOENT); 66 67 return inet_diag_table[proto]; 68 } 69 70 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler) 71 { 72 mutex_unlock(&inet_diag_table_mutex); 73 } 74 75 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk) 76 { 77 r->idiag_family = sk->sk_family; 78 79 r->id.idiag_sport = htons(sk->sk_num); 80 r->id.idiag_dport = sk->sk_dport; 81 r->id.idiag_if = sk->sk_bound_dev_if; 82 sock_diag_save_cookie(sk, r->id.idiag_cookie); 83 84 #if IS_ENABLED(CONFIG_IPV6) 85 if (sk->sk_family == AF_INET6) { 86 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr; 87 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr; 88 } else 89 #endif 90 { 91 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src)); 92 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst)); 93 94 r->id.idiag_src[0] = sk->sk_rcv_saddr; 95 r->id.idiag_dst[0] = sk->sk_daddr; 96 } 97 } 98 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill); 99 100 static size_t inet_sk_attr_size(struct sock *sk, 101 const struct inet_diag_req_v2 *req, 102 bool net_admin) 103 { 104 const struct inet_diag_handler *handler; 105 size_t aux = 0; 106 107 handler = inet_diag_table[req->sdiag_protocol]; 108 if (handler && handler->idiag_get_aux_size) 109 aux = handler->idiag_get_aux_size(sk, net_admin); 110 111 return nla_total_size(sizeof(struct tcp_info)) 112 + nla_total_size(sizeof(struct inet_diag_msg)) 113 + inet_diag_msg_attrs_size() 114 + nla_total_size(sizeof(struct inet_diag_meminfo)) 115 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32)) 116 + nla_total_size(TCP_CA_NAME_MAX) 117 + nla_total_size(sizeof(struct tcpvegas_info)) 118 + aux 119 + 64; 120 } 121 122 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb, 123 struct inet_diag_msg *r, int ext, 124 struct user_namespace *user_ns, 125 bool net_admin) 126 { 127 const struct inet_sock *inet = inet_sk(sk); 128 129 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown)) 130 goto errout; 131 132 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, 133 * hence this needs to be included regardless of socket family. 134 */ 135 if (ext & (1 << (INET_DIAG_TOS - 1))) 136 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0) 137 goto errout; 138 139 #if IS_ENABLED(CONFIG_IPV6) 140 if (r->idiag_family == AF_INET6) { 141 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 142 if (nla_put_u8(skb, INET_DIAG_TCLASS, 143 inet6_sk(sk)->tclass) < 0) 144 goto errout; 145 146 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && 147 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk))) 148 goto errout; 149 } 150 #endif 151 152 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark)) 153 goto errout; 154 155 if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) || 156 ext & (1 << (INET_DIAG_TCLASS - 1))) { 157 u32 classid = 0; 158 159 #ifdef CONFIG_SOCK_CGROUP_DATA 160 classid = sock_cgroup_classid(&sk->sk_cgrp_data); 161 #endif 162 /* Fallback to socket priority if class id isn't set. 163 * Classful qdiscs use it as direct reference to class. 164 * For cgroup2 classid is always zero. 165 */ 166 if (!classid) 167 classid = sk->sk_priority; 168 169 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid)) 170 goto errout; 171 } 172 173 #ifdef CONFIG_SOCK_CGROUP_DATA 174 if (nla_put_u64_64bit(skb, INET_DIAG_CGROUP_ID, 175 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)), 176 INET_DIAG_PAD)) 177 goto errout; 178 #endif 179 180 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); 181 r->idiag_inode = sock_i_ino(sk); 182 183 return 0; 184 errout: 185 return 1; 186 } 187 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill); 188 189 static void inet_diag_parse_attrs(const struct nlmsghdr *nlh, int hdrlen, 190 struct nlattr **req_nlas) 191 { 192 struct nlattr *nla; 193 int remaining; 194 195 nlmsg_for_each_attr(nla, nlh, hdrlen, remaining) { 196 int type = nla_type(nla); 197 198 if (type < __INET_DIAG_REQ_MAX) 199 req_nlas[type] = nla; 200 } 201 } 202 203 static int inet_diag_get_protocol(const struct inet_diag_req_v2 *req, 204 const struct inet_diag_dump_data *data) 205 { 206 if (data->req_nlas[INET_DIAG_REQ_PROTOCOL]) 207 return nla_get_u32(data->req_nlas[INET_DIAG_REQ_PROTOCOL]); 208 return req->sdiag_protocol; 209 } 210 211 #define MAX_DUMP_ALLOC_SIZE (KMALLOC_MAX_SIZE - SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) 212 213 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, 214 struct sk_buff *skb, struct netlink_callback *cb, 215 const struct inet_diag_req_v2 *req, 216 u16 nlmsg_flags, bool net_admin) 217 { 218 const struct tcp_congestion_ops *ca_ops; 219 const struct inet_diag_handler *handler; 220 struct inet_diag_dump_data *cb_data; 221 int ext = req->idiag_ext; 222 struct inet_diag_msg *r; 223 struct nlmsghdr *nlh; 224 struct nlattr *attr; 225 void *info = NULL; 226 227 cb_data = cb->data; 228 handler = inet_diag_table[inet_diag_get_protocol(req, cb_data)]; 229 BUG_ON(!handler); 230 231 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 232 cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags); 233 if (!nlh) 234 return -EMSGSIZE; 235 236 r = nlmsg_data(nlh); 237 BUG_ON(!sk_fullsock(sk)); 238 239 inet_diag_msg_common_fill(r, sk); 240 r->idiag_state = sk->sk_state; 241 r->idiag_timer = 0; 242 r->idiag_retrans = 0; 243 244 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, 245 sk_user_ns(NETLINK_CB(cb->skb).sk), 246 net_admin)) 247 goto errout; 248 249 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) { 250 struct inet_diag_meminfo minfo = { 251 .idiag_rmem = sk_rmem_alloc_get(sk), 252 .idiag_wmem = READ_ONCE(sk->sk_wmem_queued), 253 .idiag_fmem = sk->sk_forward_alloc, 254 .idiag_tmem = sk_wmem_alloc_get(sk), 255 }; 256 257 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0) 258 goto errout; 259 } 260 261 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) 262 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO)) 263 goto errout; 264 265 /* 266 * RAW sockets might have user-defined protocols assigned, 267 * so report the one supplied on socket creation. 268 */ 269 if (sk->sk_type == SOCK_RAW) { 270 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol)) 271 goto errout; 272 } 273 274 if (!icsk) { 275 handler->idiag_get_info(sk, r, NULL); 276 goto out; 277 } 278 279 if (icsk->icsk_pending == ICSK_TIME_RETRANS || 280 icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT || 281 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { 282 r->idiag_timer = 1; 283 r->idiag_retrans = icsk->icsk_retransmits; 284 r->idiag_expires = 285 jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies); 286 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 287 r->idiag_timer = 4; 288 r->idiag_retrans = icsk->icsk_probes_out; 289 r->idiag_expires = 290 jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies); 291 } else if (timer_pending(&sk->sk_timer)) { 292 r->idiag_timer = 2; 293 r->idiag_retrans = icsk->icsk_probes_out; 294 r->idiag_expires = 295 jiffies_delta_to_msecs(sk->sk_timer.expires - jiffies); 296 } else { 297 r->idiag_timer = 0; 298 r->idiag_expires = 0; 299 } 300 301 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) { 302 attr = nla_reserve_64bit(skb, INET_DIAG_INFO, 303 handler->idiag_info_size, 304 INET_DIAG_PAD); 305 if (!attr) 306 goto errout; 307 308 info = nla_data(attr); 309 } 310 311 if (ext & (1 << (INET_DIAG_CONG - 1))) { 312 int err = 0; 313 314 rcu_read_lock(); 315 ca_ops = READ_ONCE(icsk->icsk_ca_ops); 316 if (ca_ops) 317 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name); 318 rcu_read_unlock(); 319 if (err < 0) 320 goto errout; 321 } 322 323 handler->idiag_get_info(sk, r, info); 324 325 if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux) 326 if (handler->idiag_get_aux(sk, net_admin, skb) < 0) 327 goto errout; 328 329 if (sk->sk_state < TCP_TIME_WAIT) { 330 union tcp_cc_info info; 331 size_t sz = 0; 332 int attr; 333 334 rcu_read_lock(); 335 ca_ops = READ_ONCE(icsk->icsk_ca_ops); 336 if (ca_ops && ca_ops->get_info) 337 sz = ca_ops->get_info(sk, ext, &attr, &info); 338 rcu_read_unlock(); 339 if (sz && nla_put(skb, attr, sz, &info) < 0) 340 goto errout; 341 } 342 343 /* Keep it at the end for potential retry with a larger skb, 344 * or else do best-effort fitting, which is only done for the 345 * first_nlmsg. 346 */ 347 if (cb_data->bpf_stg_diag) { 348 bool first_nlmsg = ((unsigned char *)nlh == skb->data); 349 unsigned int prev_min_dump_alloc; 350 unsigned int total_nla_size = 0; 351 unsigned int msg_len; 352 int err; 353 354 msg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; 355 err = bpf_sk_storage_diag_put(cb_data->bpf_stg_diag, sk, skb, 356 INET_DIAG_SK_BPF_STORAGES, 357 &total_nla_size); 358 359 if (!err) 360 goto out; 361 362 total_nla_size += msg_len; 363 prev_min_dump_alloc = cb->min_dump_alloc; 364 if (total_nla_size > prev_min_dump_alloc) 365 cb->min_dump_alloc = min_t(u32, total_nla_size, 366 MAX_DUMP_ALLOC_SIZE); 367 368 if (!first_nlmsg) 369 goto errout; 370 371 if (cb->min_dump_alloc > prev_min_dump_alloc) 372 /* Retry with pskb_expand_head() with 373 * __GFP_DIRECT_RECLAIM 374 */ 375 goto errout; 376 377 WARN_ON_ONCE(total_nla_size <= prev_min_dump_alloc); 378 379 /* Send what we have for this sk 380 * and move on to the next sk in the following 381 * dump() 382 */ 383 } 384 385 out: 386 nlmsg_end(skb, nlh); 387 return 0; 388 389 errout: 390 nlmsg_cancel(skb, nlh); 391 return -EMSGSIZE; 392 } 393 EXPORT_SYMBOL_GPL(inet_sk_diag_fill); 394 395 static int inet_twsk_diag_fill(struct sock *sk, 396 struct sk_buff *skb, 397 struct netlink_callback *cb, 398 u16 nlmsg_flags) 399 { 400 struct inet_timewait_sock *tw = inet_twsk(sk); 401 struct inet_diag_msg *r; 402 struct nlmsghdr *nlh; 403 long tmo; 404 405 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, 406 cb->nlh->nlmsg_seq, cb->nlh->nlmsg_type, 407 sizeof(*r), nlmsg_flags); 408 if (!nlh) 409 return -EMSGSIZE; 410 411 r = nlmsg_data(nlh); 412 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 413 414 inet_diag_msg_common_fill(r, sk); 415 r->idiag_retrans = 0; 416 417 r->idiag_state = tw->tw_substate; 418 r->idiag_timer = 3; 419 tmo = tw->tw_timer.expires - jiffies; 420 r->idiag_expires = jiffies_delta_to_msecs(tmo); 421 r->idiag_rqueue = 0; 422 r->idiag_wqueue = 0; 423 r->idiag_uid = 0; 424 r->idiag_inode = 0; 425 426 nlmsg_end(skb, nlh); 427 return 0; 428 } 429 430 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb, 431 struct netlink_callback *cb, 432 u16 nlmsg_flags, bool net_admin) 433 { 434 struct request_sock *reqsk = inet_reqsk(sk); 435 struct inet_diag_msg *r; 436 struct nlmsghdr *nlh; 437 long tmo; 438 439 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 440 cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags); 441 if (!nlh) 442 return -EMSGSIZE; 443 444 r = nlmsg_data(nlh); 445 inet_diag_msg_common_fill(r, sk); 446 r->idiag_state = TCP_SYN_RECV; 447 r->idiag_timer = 1; 448 r->idiag_retrans = reqsk->num_retrans; 449 450 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) != 451 offsetof(struct sock, sk_cookie)); 452 453 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies; 454 r->idiag_expires = jiffies_delta_to_msecs(tmo); 455 r->idiag_rqueue = 0; 456 r->idiag_wqueue = 0; 457 r->idiag_uid = 0; 458 r->idiag_inode = 0; 459 460 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, 461 inet_rsk(reqsk)->ir_mark)) 462 return -EMSGSIZE; 463 464 nlmsg_end(skb, nlh); 465 return 0; 466 } 467 468 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 469 struct netlink_callback *cb, 470 const struct inet_diag_req_v2 *r, 471 u16 nlmsg_flags, bool net_admin) 472 { 473 if (sk->sk_state == TCP_TIME_WAIT) 474 return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags); 475 476 if (sk->sk_state == TCP_NEW_SYN_RECV) 477 return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin); 478 479 return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags, 480 net_admin); 481 } 482 483 struct sock *inet_diag_find_one_icsk(struct net *net, 484 struct inet_hashinfo *hashinfo, 485 const struct inet_diag_req_v2 *req) 486 { 487 struct sock *sk; 488 489 rcu_read_lock(); 490 if (req->sdiag_family == AF_INET) 491 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0], 492 req->id.idiag_dport, req->id.idiag_src[0], 493 req->id.idiag_sport, req->id.idiag_if); 494 #if IS_ENABLED(CONFIG_IPV6) 495 else if (req->sdiag_family == AF_INET6) { 496 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) && 497 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src)) 498 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3], 499 req->id.idiag_dport, req->id.idiag_src[3], 500 req->id.idiag_sport, req->id.idiag_if); 501 else 502 sk = inet6_lookup(net, hashinfo, NULL, 0, 503 (struct in6_addr *)req->id.idiag_dst, 504 req->id.idiag_dport, 505 (struct in6_addr *)req->id.idiag_src, 506 req->id.idiag_sport, 507 req->id.idiag_if); 508 } 509 #endif 510 else { 511 rcu_read_unlock(); 512 return ERR_PTR(-EINVAL); 513 } 514 rcu_read_unlock(); 515 if (!sk) 516 return ERR_PTR(-ENOENT); 517 518 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) { 519 sock_gen_put(sk); 520 return ERR_PTR(-ENOENT); 521 } 522 523 return sk; 524 } 525 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk); 526 527 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, 528 struct netlink_callback *cb, 529 const struct inet_diag_req_v2 *req) 530 { 531 struct sk_buff *in_skb = cb->skb; 532 bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN); 533 struct net *net = sock_net(in_skb->sk); 534 struct sk_buff *rep; 535 struct sock *sk; 536 int err; 537 538 sk = inet_diag_find_one_icsk(net, hashinfo, req); 539 if (IS_ERR(sk)) 540 return PTR_ERR(sk); 541 542 rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL); 543 if (!rep) { 544 err = -ENOMEM; 545 goto out; 546 } 547 548 err = sk_diag_fill(sk, rep, cb, req, 0, net_admin); 549 if (err < 0) { 550 WARN_ON(err == -EMSGSIZE); 551 nlmsg_free(rep); 552 goto out; 553 } 554 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid, 555 MSG_DONTWAIT); 556 if (err > 0) 557 err = 0; 558 559 out: 560 if (sk) 561 sock_gen_put(sk); 562 563 return err; 564 } 565 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk); 566 567 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb, 568 const struct nlmsghdr *nlh, 569 int hdrlen, 570 const struct inet_diag_req_v2 *req) 571 { 572 const struct inet_diag_handler *handler; 573 struct inet_diag_dump_data dump_data; 574 int err, protocol; 575 576 memset(&dump_data, 0, sizeof(dump_data)); 577 inet_diag_parse_attrs(nlh, hdrlen, dump_data.req_nlas); 578 protocol = inet_diag_get_protocol(req, &dump_data); 579 580 handler = inet_diag_lock_handler(protocol); 581 if (IS_ERR(handler)) { 582 err = PTR_ERR(handler); 583 } else if (cmd == SOCK_DIAG_BY_FAMILY) { 584 struct netlink_callback cb = { 585 .nlh = nlh, 586 .skb = in_skb, 587 .data = &dump_data, 588 }; 589 err = handler->dump_one(&cb, req); 590 } else if (cmd == SOCK_DESTROY && handler->destroy) { 591 err = handler->destroy(in_skb, req); 592 } else { 593 err = -EOPNOTSUPP; 594 } 595 inet_diag_unlock_handler(handler); 596 597 return err; 598 } 599 600 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 601 { 602 int words = bits >> 5; 603 604 bits &= 0x1f; 605 606 if (words) { 607 if (memcmp(a1, a2, words << 2)) 608 return 0; 609 } 610 if (bits) { 611 __be32 w1, w2; 612 __be32 mask; 613 614 w1 = a1[words]; 615 w2 = a2[words]; 616 617 mask = htonl((0xffffffff) << (32 - bits)); 618 619 if ((w1 ^ w2) & mask) 620 return 0; 621 } 622 623 return 1; 624 } 625 626 static int inet_diag_bc_run(const struct nlattr *_bc, 627 const struct inet_diag_entry *entry) 628 { 629 const void *bc = nla_data(_bc); 630 int len = nla_len(_bc); 631 632 while (len > 0) { 633 int yes = 1; 634 const struct inet_diag_bc_op *op = bc; 635 636 switch (op->code) { 637 case INET_DIAG_BC_NOP: 638 break; 639 case INET_DIAG_BC_JMP: 640 yes = 0; 641 break; 642 case INET_DIAG_BC_S_EQ: 643 yes = entry->sport == op[1].no; 644 break; 645 case INET_DIAG_BC_S_GE: 646 yes = entry->sport >= op[1].no; 647 break; 648 case INET_DIAG_BC_S_LE: 649 yes = entry->sport <= op[1].no; 650 break; 651 case INET_DIAG_BC_D_EQ: 652 yes = entry->dport == op[1].no; 653 break; 654 case INET_DIAG_BC_D_GE: 655 yes = entry->dport >= op[1].no; 656 break; 657 case INET_DIAG_BC_D_LE: 658 yes = entry->dport <= op[1].no; 659 break; 660 case INET_DIAG_BC_AUTO: 661 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 662 break; 663 case INET_DIAG_BC_S_COND: 664 case INET_DIAG_BC_D_COND: { 665 const struct inet_diag_hostcond *cond; 666 const __be32 *addr; 667 668 cond = (const struct inet_diag_hostcond *)(op + 1); 669 if (cond->port != -1 && 670 cond->port != (op->code == INET_DIAG_BC_S_COND ? 671 entry->sport : entry->dport)) { 672 yes = 0; 673 break; 674 } 675 676 if (op->code == INET_DIAG_BC_S_COND) 677 addr = entry->saddr; 678 else 679 addr = entry->daddr; 680 681 if (cond->family != AF_UNSPEC && 682 cond->family != entry->family) { 683 if (entry->family == AF_INET6 && 684 cond->family == AF_INET) { 685 if (addr[0] == 0 && addr[1] == 0 && 686 addr[2] == htonl(0xffff) && 687 bitstring_match(addr + 3, 688 cond->addr, 689 cond->prefix_len)) 690 break; 691 } 692 yes = 0; 693 break; 694 } 695 696 if (cond->prefix_len == 0) 697 break; 698 if (bitstring_match(addr, cond->addr, 699 cond->prefix_len)) 700 break; 701 yes = 0; 702 break; 703 } 704 case INET_DIAG_BC_DEV_COND: { 705 u32 ifindex; 706 707 ifindex = *((const u32 *)(op + 1)); 708 if (ifindex != entry->ifindex) 709 yes = 0; 710 break; 711 } 712 case INET_DIAG_BC_MARK_COND: { 713 struct inet_diag_markcond *cond; 714 715 cond = (struct inet_diag_markcond *)(op + 1); 716 if ((entry->mark & cond->mask) != cond->mark) 717 yes = 0; 718 break; 719 } 720 #ifdef CONFIG_SOCK_CGROUP_DATA 721 case INET_DIAG_BC_CGROUP_COND: { 722 u64 cgroup_id; 723 724 cgroup_id = get_unaligned((const u64 *)(op + 1)); 725 if (cgroup_id != entry->cgroup_id) 726 yes = 0; 727 break; 728 } 729 #endif 730 } 731 732 if (yes) { 733 len -= op->yes; 734 bc += op->yes; 735 } else { 736 len -= op->no; 737 bc += op->no; 738 } 739 } 740 return len == 0; 741 } 742 743 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV) 744 */ 745 static void entry_fill_addrs(struct inet_diag_entry *entry, 746 const struct sock *sk) 747 { 748 #if IS_ENABLED(CONFIG_IPV6) 749 if (sk->sk_family == AF_INET6) { 750 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32; 751 entry->daddr = sk->sk_v6_daddr.s6_addr32; 752 } else 753 #endif 754 { 755 entry->saddr = &sk->sk_rcv_saddr; 756 entry->daddr = &sk->sk_daddr; 757 } 758 } 759 760 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) 761 { 762 struct inet_sock *inet = inet_sk(sk); 763 struct inet_diag_entry entry; 764 765 if (!bc) 766 return 1; 767 768 entry.family = sk->sk_family; 769 entry_fill_addrs(&entry, sk); 770 entry.sport = inet->inet_num; 771 entry.dport = ntohs(inet->inet_dport); 772 entry.ifindex = sk->sk_bound_dev_if; 773 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0; 774 if (sk_fullsock(sk)) 775 entry.mark = sk->sk_mark; 776 else if (sk->sk_state == TCP_NEW_SYN_RECV) 777 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark; 778 else 779 entry.mark = 0; 780 #ifdef CONFIG_SOCK_CGROUP_DATA 781 entry.cgroup_id = sk_fullsock(sk) ? 782 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)) : 0; 783 #endif 784 785 return inet_diag_bc_run(bc, &entry); 786 } 787 EXPORT_SYMBOL_GPL(inet_diag_bc_sk); 788 789 static int valid_cc(const void *bc, int len, int cc) 790 { 791 while (len >= 0) { 792 const struct inet_diag_bc_op *op = bc; 793 794 if (cc > len) 795 return 0; 796 if (cc == len) 797 return 1; 798 if (op->yes < 4 || op->yes & 3) 799 return 0; 800 len -= op->yes; 801 bc += op->yes; 802 } 803 return 0; 804 } 805 806 /* data is u32 ifindex */ 807 static bool valid_devcond(const struct inet_diag_bc_op *op, int len, 808 int *min_len) 809 { 810 /* Check ifindex space. */ 811 *min_len += sizeof(u32); 812 if (len < *min_len) 813 return false; 814 815 return true; 816 } 817 /* Validate an inet_diag_hostcond. */ 818 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len, 819 int *min_len) 820 { 821 struct inet_diag_hostcond *cond; 822 int addr_len; 823 824 /* Check hostcond space. */ 825 *min_len += sizeof(struct inet_diag_hostcond); 826 if (len < *min_len) 827 return false; 828 cond = (struct inet_diag_hostcond *)(op + 1); 829 830 /* Check address family and address length. */ 831 switch (cond->family) { 832 case AF_UNSPEC: 833 addr_len = 0; 834 break; 835 case AF_INET: 836 addr_len = sizeof(struct in_addr); 837 break; 838 case AF_INET6: 839 addr_len = sizeof(struct in6_addr); 840 break; 841 default: 842 return false; 843 } 844 *min_len += addr_len; 845 if (len < *min_len) 846 return false; 847 848 /* Check prefix length (in bits) vs address length (in bytes). */ 849 if (cond->prefix_len > 8 * addr_len) 850 return false; 851 852 return true; 853 } 854 855 /* Validate a port comparison operator. */ 856 static bool valid_port_comparison(const struct inet_diag_bc_op *op, 857 int len, int *min_len) 858 { 859 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */ 860 *min_len += sizeof(struct inet_diag_bc_op); 861 if (len < *min_len) 862 return false; 863 return true; 864 } 865 866 static bool valid_markcond(const struct inet_diag_bc_op *op, int len, 867 int *min_len) 868 { 869 *min_len += sizeof(struct inet_diag_markcond); 870 return len >= *min_len; 871 } 872 873 #ifdef CONFIG_SOCK_CGROUP_DATA 874 static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len, 875 int *min_len) 876 { 877 *min_len += sizeof(u64); 878 return len >= *min_len; 879 } 880 #endif 881 882 static int inet_diag_bc_audit(const struct nlattr *attr, 883 const struct sk_buff *skb) 884 { 885 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN); 886 const void *bytecode, *bc; 887 int bytecode_len, len; 888 889 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op)) 890 return -EINVAL; 891 892 bytecode = bc = nla_data(attr); 893 len = bytecode_len = nla_len(attr); 894 895 while (len > 0) { 896 int min_len = sizeof(struct inet_diag_bc_op); 897 const struct inet_diag_bc_op *op = bc; 898 899 switch (op->code) { 900 case INET_DIAG_BC_S_COND: 901 case INET_DIAG_BC_D_COND: 902 if (!valid_hostcond(bc, len, &min_len)) 903 return -EINVAL; 904 break; 905 case INET_DIAG_BC_DEV_COND: 906 if (!valid_devcond(bc, len, &min_len)) 907 return -EINVAL; 908 break; 909 case INET_DIAG_BC_S_EQ: 910 case INET_DIAG_BC_S_GE: 911 case INET_DIAG_BC_S_LE: 912 case INET_DIAG_BC_D_EQ: 913 case INET_DIAG_BC_D_GE: 914 case INET_DIAG_BC_D_LE: 915 if (!valid_port_comparison(bc, len, &min_len)) 916 return -EINVAL; 917 break; 918 case INET_DIAG_BC_MARK_COND: 919 if (!net_admin) 920 return -EPERM; 921 if (!valid_markcond(bc, len, &min_len)) 922 return -EINVAL; 923 break; 924 #ifdef CONFIG_SOCK_CGROUP_DATA 925 case INET_DIAG_BC_CGROUP_COND: 926 if (!valid_cgroupcond(bc, len, &min_len)) 927 return -EINVAL; 928 break; 929 #endif 930 case INET_DIAG_BC_AUTO: 931 case INET_DIAG_BC_JMP: 932 case INET_DIAG_BC_NOP: 933 break; 934 default: 935 return -EINVAL; 936 } 937 938 if (op->code != INET_DIAG_BC_NOP) { 939 if (op->no < min_len || op->no > len + 4 || op->no & 3) 940 return -EINVAL; 941 if (op->no < len && 942 !valid_cc(bytecode, bytecode_len, len - op->no)) 943 return -EINVAL; 944 } 945 946 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3) 947 return -EINVAL; 948 bc += op->yes; 949 len -= op->yes; 950 } 951 return len == 0 ? 0 : -EINVAL; 952 } 953 954 static void twsk_build_assert(void) 955 { 956 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) != 957 offsetof(struct sock, sk_family)); 958 959 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) != 960 offsetof(struct inet_sock, inet_num)); 961 962 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) != 963 offsetof(struct inet_sock, inet_dport)); 964 965 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) != 966 offsetof(struct inet_sock, inet_rcv_saddr)); 967 968 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) != 969 offsetof(struct inet_sock, inet_daddr)); 970 971 #if IS_ENABLED(CONFIG_IPV6) 972 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) != 973 offsetof(struct sock, sk_v6_rcv_saddr)); 974 975 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) != 976 offsetof(struct sock, sk_v6_daddr)); 977 #endif 978 } 979 980 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, 981 struct netlink_callback *cb, 982 const struct inet_diag_req_v2 *r) 983 { 984 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN); 985 struct inet_diag_dump_data *cb_data = cb->data; 986 struct net *net = sock_net(skb->sk); 987 u32 idiag_states = r->idiag_states; 988 int i, num, s_i, s_num; 989 struct nlattr *bc; 990 struct sock *sk; 991 992 bc = cb_data->inet_diag_nla_bc; 993 if (idiag_states & TCPF_SYN_RECV) 994 idiag_states |= TCPF_NEW_SYN_RECV; 995 s_i = cb->args[1]; 996 s_num = num = cb->args[2]; 997 998 if (cb->args[0] == 0) { 999 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport) 1000 goto skip_listen_ht; 1001 1002 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 1003 struct inet_listen_hashbucket *ilb; 1004 struct hlist_nulls_node *node; 1005 1006 num = 0; 1007 ilb = &hashinfo->listening_hash[i]; 1008 spin_lock(&ilb->lock); 1009 sk_nulls_for_each(sk, node, &ilb->nulls_head) { 1010 struct inet_sock *inet = inet_sk(sk); 1011 1012 if (!net_eq(sock_net(sk), net)) 1013 continue; 1014 1015 if (num < s_num) { 1016 num++; 1017 continue; 1018 } 1019 1020 if (r->sdiag_family != AF_UNSPEC && 1021 sk->sk_family != r->sdiag_family) 1022 goto next_listen; 1023 1024 if (r->id.idiag_sport != inet->inet_sport && 1025 r->id.idiag_sport) 1026 goto next_listen; 1027 1028 if (!inet_diag_bc_sk(bc, sk)) 1029 goto next_listen; 1030 1031 if (inet_sk_diag_fill(sk, inet_csk(sk), skb, 1032 cb, r, NLM_F_MULTI, 1033 net_admin) < 0) { 1034 spin_unlock(&ilb->lock); 1035 goto done; 1036 } 1037 1038 next_listen: 1039 ++num; 1040 } 1041 spin_unlock(&ilb->lock); 1042 1043 s_num = 0; 1044 } 1045 skip_listen_ht: 1046 cb->args[0] = 1; 1047 s_i = num = s_num = 0; 1048 } 1049 1050 if (!(idiag_states & ~TCPF_LISTEN)) 1051 goto out; 1052 1053 #define SKARR_SZ 16 1054 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 1055 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 1056 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 1057 struct hlist_nulls_node *node; 1058 struct sock *sk_arr[SKARR_SZ]; 1059 int num_arr[SKARR_SZ]; 1060 int idx, accum, res; 1061 1062 if (hlist_nulls_empty(&head->chain)) 1063 continue; 1064 1065 if (i > s_i) 1066 s_num = 0; 1067 1068 next_chunk: 1069 num = 0; 1070 accum = 0; 1071 spin_lock_bh(lock); 1072 sk_nulls_for_each(sk, node, &head->chain) { 1073 int state; 1074 1075 if (!net_eq(sock_net(sk), net)) 1076 continue; 1077 if (num < s_num) 1078 goto next_normal; 1079 state = (sk->sk_state == TCP_TIME_WAIT) ? 1080 inet_twsk(sk)->tw_substate : sk->sk_state; 1081 if (!(idiag_states & (1 << state))) 1082 goto next_normal; 1083 if (r->sdiag_family != AF_UNSPEC && 1084 sk->sk_family != r->sdiag_family) 1085 goto next_normal; 1086 if (r->id.idiag_sport != htons(sk->sk_num) && 1087 r->id.idiag_sport) 1088 goto next_normal; 1089 if (r->id.idiag_dport != sk->sk_dport && 1090 r->id.idiag_dport) 1091 goto next_normal; 1092 twsk_build_assert(); 1093 1094 if (!inet_diag_bc_sk(bc, sk)) 1095 goto next_normal; 1096 1097 if (!refcount_inc_not_zero(&sk->sk_refcnt)) 1098 goto next_normal; 1099 1100 num_arr[accum] = num; 1101 sk_arr[accum] = sk; 1102 if (++accum == SKARR_SZ) 1103 break; 1104 next_normal: 1105 ++num; 1106 } 1107 spin_unlock_bh(lock); 1108 res = 0; 1109 for (idx = 0; idx < accum; idx++) { 1110 if (res >= 0) { 1111 res = sk_diag_fill(sk_arr[idx], skb, cb, r, 1112 NLM_F_MULTI, net_admin); 1113 if (res < 0) 1114 num = num_arr[idx]; 1115 } 1116 sock_gen_put(sk_arr[idx]); 1117 } 1118 if (res < 0) 1119 break; 1120 cond_resched(); 1121 if (accum == SKARR_SZ) { 1122 s_num = num + 1; 1123 goto next_chunk; 1124 } 1125 } 1126 1127 done: 1128 cb->args[1] = i; 1129 cb->args[2] = num; 1130 out: 1131 ; 1132 } 1133 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk); 1134 1135 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 1136 const struct inet_diag_req_v2 *r) 1137 { 1138 struct inet_diag_dump_data *cb_data = cb->data; 1139 const struct inet_diag_handler *handler; 1140 u32 prev_min_dump_alloc; 1141 int protocol, err = 0; 1142 1143 protocol = inet_diag_get_protocol(r, cb_data); 1144 1145 again: 1146 prev_min_dump_alloc = cb->min_dump_alloc; 1147 handler = inet_diag_lock_handler(protocol); 1148 if (!IS_ERR(handler)) 1149 handler->dump(skb, cb, r); 1150 else 1151 err = PTR_ERR(handler); 1152 inet_diag_unlock_handler(handler); 1153 1154 /* The skb is not large enough to fit one sk info and 1155 * inet_sk_diag_fill() has requested for a larger skb. 1156 */ 1157 if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) { 1158 err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL); 1159 if (!err) 1160 goto again; 1161 } 1162 1163 return err ? : skb->len; 1164 } 1165 1166 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 1167 { 1168 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh)); 1169 } 1170 1171 static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen) 1172 { 1173 const struct nlmsghdr *nlh = cb->nlh; 1174 struct inet_diag_dump_data *cb_data; 1175 struct sk_buff *skb = cb->skb; 1176 struct nlattr *nla; 1177 int err; 1178 1179 cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL); 1180 if (!cb_data) 1181 return -ENOMEM; 1182 1183 inet_diag_parse_attrs(nlh, hdrlen, cb_data->req_nlas); 1184 1185 nla = cb_data->inet_diag_nla_bc; 1186 if (nla) { 1187 err = inet_diag_bc_audit(nla, skb); 1188 if (err) { 1189 kfree(cb_data); 1190 return err; 1191 } 1192 } 1193 1194 nla = cb_data->inet_diag_nla_bpf_stgs; 1195 if (nla) { 1196 struct bpf_sk_storage_diag *bpf_stg_diag; 1197 1198 bpf_stg_diag = bpf_sk_storage_diag_alloc(nla); 1199 if (IS_ERR(bpf_stg_diag)) { 1200 kfree(cb_data); 1201 return PTR_ERR(bpf_stg_diag); 1202 } 1203 cb_data->bpf_stg_diag = bpf_stg_diag; 1204 } 1205 1206 cb->data = cb_data; 1207 return 0; 1208 } 1209 1210 static int inet_diag_dump_start(struct netlink_callback *cb) 1211 { 1212 return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2)); 1213 } 1214 1215 static int inet_diag_dump_start_compat(struct netlink_callback *cb) 1216 { 1217 return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req)); 1218 } 1219 1220 static int inet_diag_dump_done(struct netlink_callback *cb) 1221 { 1222 struct inet_diag_dump_data *cb_data = cb->data; 1223 1224 bpf_sk_storage_diag_free(cb_data->bpf_stg_diag); 1225 kfree(cb->data); 1226 1227 return 0; 1228 } 1229 1230 static int inet_diag_type2proto(int type) 1231 { 1232 switch (type) { 1233 case TCPDIAG_GETSOCK: 1234 return IPPROTO_TCP; 1235 case DCCPDIAG_GETSOCK: 1236 return IPPROTO_DCCP; 1237 default: 1238 return 0; 1239 } 1240 } 1241 1242 static int inet_diag_dump_compat(struct sk_buff *skb, 1243 struct netlink_callback *cb) 1244 { 1245 struct inet_diag_req *rc = nlmsg_data(cb->nlh); 1246 struct inet_diag_req_v2 req; 1247 1248 req.sdiag_family = AF_UNSPEC; /* compatibility */ 1249 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 1250 req.idiag_ext = rc->idiag_ext; 1251 req.idiag_states = rc->idiag_states; 1252 req.id = rc->id; 1253 1254 return __inet_diag_dump(skb, cb, &req); 1255 } 1256 1257 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 1258 const struct nlmsghdr *nlh) 1259 { 1260 struct inet_diag_req *rc = nlmsg_data(nlh); 1261 struct inet_diag_req_v2 req; 1262 1263 req.sdiag_family = rc->idiag_family; 1264 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 1265 req.idiag_ext = rc->idiag_ext; 1266 req.idiag_states = rc->idiag_states; 1267 req.id = rc->id; 1268 1269 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, 1270 sizeof(struct inet_diag_req), &req); 1271 } 1272 1273 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 1274 { 1275 int hdrlen = sizeof(struct inet_diag_req); 1276 struct net *net = sock_net(skb->sk); 1277 1278 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 1279 nlmsg_len(nlh) < hdrlen) 1280 return -EINVAL; 1281 1282 if (nlh->nlmsg_flags & NLM_F_DUMP) { 1283 struct netlink_dump_control c = { 1284 .start = inet_diag_dump_start_compat, 1285 .done = inet_diag_dump_done, 1286 .dump = inet_diag_dump_compat, 1287 }; 1288 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c); 1289 } 1290 1291 return inet_diag_get_exact_compat(skb, nlh); 1292 } 1293 1294 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h) 1295 { 1296 int hdrlen = sizeof(struct inet_diag_req_v2); 1297 struct net *net = sock_net(skb->sk); 1298 1299 if (nlmsg_len(h) < hdrlen) 1300 return -EINVAL; 1301 1302 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY && 1303 h->nlmsg_flags & NLM_F_DUMP) { 1304 struct netlink_dump_control c = { 1305 .start = inet_diag_dump_start, 1306 .done = inet_diag_dump_done, 1307 .dump = inet_diag_dump, 1308 }; 1309 return netlink_dump_start(net->diag_nlsk, skb, h, &c); 1310 } 1311 1312 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, hdrlen, 1313 nlmsg_data(h)); 1314 } 1315 1316 static 1317 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk) 1318 { 1319 const struct inet_diag_handler *handler; 1320 struct nlmsghdr *nlh; 1321 struct nlattr *attr; 1322 struct inet_diag_msg *r; 1323 void *info = NULL; 1324 int err = 0; 1325 1326 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0); 1327 if (!nlh) 1328 return -ENOMEM; 1329 1330 r = nlmsg_data(nlh); 1331 memset(r, 0, sizeof(*r)); 1332 inet_diag_msg_common_fill(r, sk); 1333 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM) 1334 r->id.idiag_sport = inet_sk(sk)->inet_sport; 1335 r->idiag_state = sk->sk_state; 1336 1337 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) { 1338 nlmsg_cancel(skb, nlh); 1339 return err; 1340 } 1341 1342 handler = inet_diag_lock_handler(sk->sk_protocol); 1343 if (IS_ERR(handler)) { 1344 inet_diag_unlock_handler(handler); 1345 nlmsg_cancel(skb, nlh); 1346 return PTR_ERR(handler); 1347 } 1348 1349 attr = handler->idiag_info_size 1350 ? nla_reserve_64bit(skb, INET_DIAG_INFO, 1351 handler->idiag_info_size, 1352 INET_DIAG_PAD) 1353 : NULL; 1354 if (attr) 1355 info = nla_data(attr); 1356 1357 handler->idiag_get_info(sk, r, info); 1358 inet_diag_unlock_handler(handler); 1359 1360 nlmsg_end(skb, nlh); 1361 return 0; 1362 } 1363 1364 static const struct sock_diag_handler inet_diag_handler = { 1365 .family = AF_INET, 1366 .dump = inet_diag_handler_cmd, 1367 .get_info = inet_diag_handler_get_info, 1368 .destroy = inet_diag_handler_cmd, 1369 }; 1370 1371 static const struct sock_diag_handler inet6_diag_handler = { 1372 .family = AF_INET6, 1373 .dump = inet_diag_handler_cmd, 1374 .get_info = inet_diag_handler_get_info, 1375 .destroy = inet_diag_handler_cmd, 1376 }; 1377 1378 int inet_diag_register(const struct inet_diag_handler *h) 1379 { 1380 const __u16 type = h->idiag_type; 1381 int err = -EINVAL; 1382 1383 if (type >= IPPROTO_MAX) 1384 goto out; 1385 1386 mutex_lock(&inet_diag_table_mutex); 1387 err = -EEXIST; 1388 if (!inet_diag_table[type]) { 1389 inet_diag_table[type] = h; 1390 err = 0; 1391 } 1392 mutex_unlock(&inet_diag_table_mutex); 1393 out: 1394 return err; 1395 } 1396 EXPORT_SYMBOL_GPL(inet_diag_register); 1397 1398 void inet_diag_unregister(const struct inet_diag_handler *h) 1399 { 1400 const __u16 type = h->idiag_type; 1401 1402 if (type >= IPPROTO_MAX) 1403 return; 1404 1405 mutex_lock(&inet_diag_table_mutex); 1406 inet_diag_table[type] = NULL; 1407 mutex_unlock(&inet_diag_table_mutex); 1408 } 1409 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1410 1411 static int __init inet_diag_init(void) 1412 { 1413 const int inet_diag_table_size = (IPPROTO_MAX * 1414 sizeof(struct inet_diag_handler *)); 1415 int err = -ENOMEM; 1416 1417 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1418 if (!inet_diag_table) 1419 goto out; 1420 1421 err = sock_diag_register(&inet_diag_handler); 1422 if (err) 1423 goto out_free_nl; 1424 1425 err = sock_diag_register(&inet6_diag_handler); 1426 if (err) 1427 goto out_free_inet; 1428 1429 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1430 out: 1431 return err; 1432 1433 out_free_inet: 1434 sock_diag_unregister(&inet_diag_handler); 1435 out_free_nl: 1436 kfree(inet_diag_table); 1437 goto out; 1438 } 1439 1440 static void __exit inet_diag_exit(void) 1441 { 1442 sock_diag_unregister(&inet6_diag_handler); 1443 sock_diag_unregister(&inet_diag_handler); 1444 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1445 kfree(inet_diag_table); 1446 } 1447 1448 module_init(inet_diag_init); 1449 module_exit(inet_diag_exit); 1450 MODULE_LICENSE("GPL"); 1451 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */); 1452 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */); 1453