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 struct inet_diag_sockopt inet_sockopt; 129 130 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown)) 131 goto errout; 132 133 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, 134 * hence this needs to be included regardless of socket family. 135 */ 136 if (ext & (1 << (INET_DIAG_TOS - 1))) 137 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0) 138 goto errout; 139 140 #if IS_ENABLED(CONFIG_IPV6) 141 if (r->idiag_family == AF_INET6) { 142 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 143 if (nla_put_u8(skb, INET_DIAG_TCLASS, 144 inet6_sk(sk)->tclass) < 0) 145 goto errout; 146 147 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && 148 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk))) 149 goto errout; 150 } 151 #endif 152 153 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark)) 154 goto errout; 155 156 if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) || 157 ext & (1 << (INET_DIAG_TCLASS - 1))) { 158 u32 classid = 0; 159 160 #ifdef CONFIG_SOCK_CGROUP_DATA 161 classid = sock_cgroup_classid(&sk->sk_cgrp_data); 162 #endif 163 /* Fallback to socket priority if class id isn't set. 164 * Classful qdiscs use it as direct reference to class. 165 * For cgroup2 classid is always zero. 166 */ 167 if (!classid) 168 classid = sk->sk_priority; 169 170 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid)) 171 goto errout; 172 } 173 174 #ifdef CONFIG_SOCK_CGROUP_DATA 175 if (nla_put_u64_64bit(skb, INET_DIAG_CGROUP_ID, 176 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)), 177 INET_DIAG_PAD)) 178 goto errout; 179 #endif 180 181 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); 182 r->idiag_inode = sock_i_ino(sk); 183 184 memset(&inet_sockopt, 0, sizeof(inet_sockopt)); 185 inet_sockopt.recverr = inet->recverr; 186 inet_sockopt.is_icsk = inet->is_icsk; 187 inet_sockopt.freebind = inet->freebind; 188 inet_sockopt.hdrincl = inet->hdrincl; 189 inet_sockopt.mc_loop = inet->mc_loop; 190 inet_sockopt.transparent = inet->transparent; 191 inet_sockopt.mc_all = inet->mc_all; 192 inet_sockopt.nodefrag = inet->nodefrag; 193 inet_sockopt.bind_address_no_port = inet->bind_address_no_port; 194 inet_sockopt.recverr_rfc4884 = inet->recverr_rfc4884; 195 inet_sockopt.defer_connect = inet->defer_connect; 196 if (nla_put(skb, INET_DIAG_SOCKOPT, sizeof(inet_sockopt), 197 &inet_sockopt)) 198 goto errout; 199 200 return 0; 201 errout: 202 return 1; 203 } 204 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill); 205 206 static int inet_diag_parse_attrs(const struct nlmsghdr *nlh, int hdrlen, 207 struct nlattr **req_nlas) 208 { 209 struct nlattr *nla; 210 int remaining; 211 212 nlmsg_for_each_attr(nla, nlh, hdrlen, remaining) { 213 int type = nla_type(nla); 214 215 if (type == INET_DIAG_REQ_PROTOCOL && nla_len(nla) != sizeof(u32)) 216 return -EINVAL; 217 218 if (type < __INET_DIAG_REQ_MAX) 219 req_nlas[type] = nla; 220 } 221 return 0; 222 } 223 224 static int inet_diag_get_protocol(const struct inet_diag_req_v2 *req, 225 const struct inet_diag_dump_data *data) 226 { 227 if (data->req_nlas[INET_DIAG_REQ_PROTOCOL]) 228 return nla_get_u32(data->req_nlas[INET_DIAG_REQ_PROTOCOL]); 229 return req->sdiag_protocol; 230 } 231 232 #define MAX_DUMP_ALLOC_SIZE (KMALLOC_MAX_SIZE - SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) 233 234 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, 235 struct sk_buff *skb, struct netlink_callback *cb, 236 const struct inet_diag_req_v2 *req, 237 u16 nlmsg_flags, bool net_admin) 238 { 239 const struct tcp_congestion_ops *ca_ops; 240 const struct inet_diag_handler *handler; 241 struct inet_diag_dump_data *cb_data; 242 int ext = req->idiag_ext; 243 struct inet_diag_msg *r; 244 struct nlmsghdr *nlh; 245 struct nlattr *attr; 246 void *info = NULL; 247 248 cb_data = cb->data; 249 handler = inet_diag_table[inet_diag_get_protocol(req, cb_data)]; 250 BUG_ON(!handler); 251 252 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 253 cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags); 254 if (!nlh) 255 return -EMSGSIZE; 256 257 r = nlmsg_data(nlh); 258 BUG_ON(!sk_fullsock(sk)); 259 260 inet_diag_msg_common_fill(r, sk); 261 r->idiag_state = sk->sk_state; 262 r->idiag_timer = 0; 263 r->idiag_retrans = 0; 264 265 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, 266 sk_user_ns(NETLINK_CB(cb->skb).sk), 267 net_admin)) 268 goto errout; 269 270 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) { 271 struct inet_diag_meminfo minfo = { 272 .idiag_rmem = sk_rmem_alloc_get(sk), 273 .idiag_wmem = READ_ONCE(sk->sk_wmem_queued), 274 .idiag_fmem = sk->sk_forward_alloc, 275 .idiag_tmem = sk_wmem_alloc_get(sk), 276 }; 277 278 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0) 279 goto errout; 280 } 281 282 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) 283 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO)) 284 goto errout; 285 286 /* 287 * RAW sockets might have user-defined protocols assigned, 288 * so report the one supplied on socket creation. 289 */ 290 if (sk->sk_type == SOCK_RAW) { 291 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol)) 292 goto errout; 293 } 294 295 if (!icsk) { 296 handler->idiag_get_info(sk, r, NULL); 297 goto out; 298 } 299 300 if (icsk->icsk_pending == ICSK_TIME_RETRANS || 301 icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT || 302 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { 303 r->idiag_timer = 1; 304 r->idiag_retrans = icsk->icsk_retransmits; 305 r->idiag_expires = 306 jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies); 307 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 308 r->idiag_timer = 4; 309 r->idiag_retrans = icsk->icsk_probes_out; 310 r->idiag_expires = 311 jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies); 312 } else if (timer_pending(&sk->sk_timer)) { 313 r->idiag_timer = 2; 314 r->idiag_retrans = icsk->icsk_probes_out; 315 r->idiag_expires = 316 jiffies_delta_to_msecs(sk->sk_timer.expires - jiffies); 317 } else { 318 r->idiag_timer = 0; 319 r->idiag_expires = 0; 320 } 321 322 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) { 323 attr = nla_reserve_64bit(skb, INET_DIAG_INFO, 324 handler->idiag_info_size, 325 INET_DIAG_PAD); 326 if (!attr) 327 goto errout; 328 329 info = nla_data(attr); 330 } 331 332 if (ext & (1 << (INET_DIAG_CONG - 1))) { 333 int err = 0; 334 335 rcu_read_lock(); 336 ca_ops = READ_ONCE(icsk->icsk_ca_ops); 337 if (ca_ops) 338 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name); 339 rcu_read_unlock(); 340 if (err < 0) 341 goto errout; 342 } 343 344 handler->idiag_get_info(sk, r, info); 345 346 if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux) 347 if (handler->idiag_get_aux(sk, net_admin, skb) < 0) 348 goto errout; 349 350 if (sk->sk_state < TCP_TIME_WAIT) { 351 union tcp_cc_info info; 352 size_t sz = 0; 353 int attr; 354 355 rcu_read_lock(); 356 ca_ops = READ_ONCE(icsk->icsk_ca_ops); 357 if (ca_ops && ca_ops->get_info) 358 sz = ca_ops->get_info(sk, ext, &attr, &info); 359 rcu_read_unlock(); 360 if (sz && nla_put(skb, attr, sz, &info) < 0) 361 goto errout; 362 } 363 364 /* Keep it at the end for potential retry with a larger skb, 365 * or else do best-effort fitting, which is only done for the 366 * first_nlmsg. 367 */ 368 if (cb_data->bpf_stg_diag) { 369 bool first_nlmsg = ((unsigned char *)nlh == skb->data); 370 unsigned int prev_min_dump_alloc; 371 unsigned int total_nla_size = 0; 372 unsigned int msg_len; 373 int err; 374 375 msg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; 376 err = bpf_sk_storage_diag_put(cb_data->bpf_stg_diag, sk, skb, 377 INET_DIAG_SK_BPF_STORAGES, 378 &total_nla_size); 379 380 if (!err) 381 goto out; 382 383 total_nla_size += msg_len; 384 prev_min_dump_alloc = cb->min_dump_alloc; 385 if (total_nla_size > prev_min_dump_alloc) 386 cb->min_dump_alloc = min_t(u32, total_nla_size, 387 MAX_DUMP_ALLOC_SIZE); 388 389 if (!first_nlmsg) 390 goto errout; 391 392 if (cb->min_dump_alloc > prev_min_dump_alloc) 393 /* Retry with pskb_expand_head() with 394 * __GFP_DIRECT_RECLAIM 395 */ 396 goto errout; 397 398 WARN_ON_ONCE(total_nla_size <= prev_min_dump_alloc); 399 400 /* Send what we have for this sk 401 * and move on to the next sk in the following 402 * dump() 403 */ 404 } 405 406 out: 407 nlmsg_end(skb, nlh); 408 return 0; 409 410 errout: 411 nlmsg_cancel(skb, nlh); 412 return -EMSGSIZE; 413 } 414 EXPORT_SYMBOL_GPL(inet_sk_diag_fill); 415 416 static int inet_twsk_diag_fill(struct sock *sk, 417 struct sk_buff *skb, 418 struct netlink_callback *cb, 419 u16 nlmsg_flags) 420 { 421 struct inet_timewait_sock *tw = inet_twsk(sk); 422 struct inet_diag_msg *r; 423 struct nlmsghdr *nlh; 424 long tmo; 425 426 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, 427 cb->nlh->nlmsg_seq, cb->nlh->nlmsg_type, 428 sizeof(*r), nlmsg_flags); 429 if (!nlh) 430 return -EMSGSIZE; 431 432 r = nlmsg_data(nlh); 433 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 434 435 inet_diag_msg_common_fill(r, sk); 436 r->idiag_retrans = 0; 437 438 r->idiag_state = tw->tw_substate; 439 r->idiag_timer = 3; 440 tmo = tw->tw_timer.expires - jiffies; 441 r->idiag_expires = jiffies_delta_to_msecs(tmo); 442 r->idiag_rqueue = 0; 443 r->idiag_wqueue = 0; 444 r->idiag_uid = 0; 445 r->idiag_inode = 0; 446 447 nlmsg_end(skb, nlh); 448 return 0; 449 } 450 451 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb, 452 struct netlink_callback *cb, 453 u16 nlmsg_flags, bool net_admin) 454 { 455 struct request_sock *reqsk = inet_reqsk(sk); 456 struct inet_diag_msg *r; 457 struct nlmsghdr *nlh; 458 long tmo; 459 460 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 461 cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags); 462 if (!nlh) 463 return -EMSGSIZE; 464 465 r = nlmsg_data(nlh); 466 inet_diag_msg_common_fill(r, sk); 467 r->idiag_state = TCP_SYN_RECV; 468 r->idiag_timer = 1; 469 r->idiag_retrans = reqsk->num_retrans; 470 471 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) != 472 offsetof(struct sock, sk_cookie)); 473 474 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies; 475 r->idiag_expires = jiffies_delta_to_msecs(tmo); 476 r->idiag_rqueue = 0; 477 r->idiag_wqueue = 0; 478 r->idiag_uid = 0; 479 r->idiag_inode = 0; 480 481 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, 482 inet_rsk(reqsk)->ir_mark)) { 483 nlmsg_cancel(skb, nlh); 484 return -EMSGSIZE; 485 } 486 487 nlmsg_end(skb, nlh); 488 return 0; 489 } 490 491 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 492 struct netlink_callback *cb, 493 const struct inet_diag_req_v2 *r, 494 u16 nlmsg_flags, bool net_admin) 495 { 496 if (sk->sk_state == TCP_TIME_WAIT) 497 return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags); 498 499 if (sk->sk_state == TCP_NEW_SYN_RECV) 500 return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin); 501 502 return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags, 503 net_admin); 504 } 505 506 struct sock *inet_diag_find_one_icsk(struct net *net, 507 struct inet_hashinfo *hashinfo, 508 const struct inet_diag_req_v2 *req) 509 { 510 struct sock *sk; 511 512 rcu_read_lock(); 513 if (req->sdiag_family == AF_INET) 514 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0], 515 req->id.idiag_dport, req->id.idiag_src[0], 516 req->id.idiag_sport, req->id.idiag_if); 517 #if IS_ENABLED(CONFIG_IPV6) 518 else if (req->sdiag_family == AF_INET6) { 519 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) && 520 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src)) 521 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3], 522 req->id.idiag_dport, req->id.idiag_src[3], 523 req->id.idiag_sport, req->id.idiag_if); 524 else 525 sk = inet6_lookup(net, hashinfo, NULL, 0, 526 (struct in6_addr *)req->id.idiag_dst, 527 req->id.idiag_dport, 528 (struct in6_addr *)req->id.idiag_src, 529 req->id.idiag_sport, 530 req->id.idiag_if); 531 } 532 #endif 533 else { 534 rcu_read_unlock(); 535 return ERR_PTR(-EINVAL); 536 } 537 rcu_read_unlock(); 538 if (!sk) 539 return ERR_PTR(-ENOENT); 540 541 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) { 542 sock_gen_put(sk); 543 return ERR_PTR(-ENOENT); 544 } 545 546 return sk; 547 } 548 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk); 549 550 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, 551 struct netlink_callback *cb, 552 const struct inet_diag_req_v2 *req) 553 { 554 struct sk_buff *in_skb = cb->skb; 555 bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN); 556 struct net *net = sock_net(in_skb->sk); 557 struct sk_buff *rep; 558 struct sock *sk; 559 int err; 560 561 sk = inet_diag_find_one_icsk(net, hashinfo, req); 562 if (IS_ERR(sk)) 563 return PTR_ERR(sk); 564 565 rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL); 566 if (!rep) { 567 err = -ENOMEM; 568 goto out; 569 } 570 571 err = sk_diag_fill(sk, rep, cb, req, 0, net_admin); 572 if (err < 0) { 573 WARN_ON(err == -EMSGSIZE); 574 nlmsg_free(rep); 575 goto out; 576 } 577 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid, 578 MSG_DONTWAIT); 579 if (err > 0) 580 err = 0; 581 582 out: 583 if (sk) 584 sock_gen_put(sk); 585 586 return err; 587 } 588 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk); 589 590 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb, 591 const struct nlmsghdr *nlh, 592 int hdrlen, 593 const struct inet_diag_req_v2 *req) 594 { 595 const struct inet_diag_handler *handler; 596 struct inet_diag_dump_data dump_data; 597 int err, protocol; 598 599 memset(&dump_data, 0, sizeof(dump_data)); 600 err = inet_diag_parse_attrs(nlh, hdrlen, dump_data.req_nlas); 601 if (err) 602 return err; 603 604 protocol = inet_diag_get_protocol(req, &dump_data); 605 606 handler = inet_diag_lock_handler(protocol); 607 if (IS_ERR(handler)) { 608 err = PTR_ERR(handler); 609 } else if (cmd == SOCK_DIAG_BY_FAMILY) { 610 struct netlink_callback cb = { 611 .nlh = nlh, 612 .skb = in_skb, 613 .data = &dump_data, 614 }; 615 err = handler->dump_one(&cb, req); 616 } else if (cmd == SOCK_DESTROY && handler->destroy) { 617 err = handler->destroy(in_skb, req); 618 } else { 619 err = -EOPNOTSUPP; 620 } 621 inet_diag_unlock_handler(handler); 622 623 return err; 624 } 625 626 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 627 { 628 int words = bits >> 5; 629 630 bits &= 0x1f; 631 632 if (words) { 633 if (memcmp(a1, a2, words << 2)) 634 return 0; 635 } 636 if (bits) { 637 __be32 w1, w2; 638 __be32 mask; 639 640 w1 = a1[words]; 641 w2 = a2[words]; 642 643 mask = htonl((0xffffffff) << (32 - bits)); 644 645 if ((w1 ^ w2) & mask) 646 return 0; 647 } 648 649 return 1; 650 } 651 652 static int inet_diag_bc_run(const struct nlattr *_bc, 653 const struct inet_diag_entry *entry) 654 { 655 const void *bc = nla_data(_bc); 656 int len = nla_len(_bc); 657 658 while (len > 0) { 659 int yes = 1; 660 const struct inet_diag_bc_op *op = bc; 661 662 switch (op->code) { 663 case INET_DIAG_BC_NOP: 664 break; 665 case INET_DIAG_BC_JMP: 666 yes = 0; 667 break; 668 case INET_DIAG_BC_S_EQ: 669 yes = entry->sport == op[1].no; 670 break; 671 case INET_DIAG_BC_S_GE: 672 yes = entry->sport >= op[1].no; 673 break; 674 case INET_DIAG_BC_S_LE: 675 yes = entry->sport <= op[1].no; 676 break; 677 case INET_DIAG_BC_D_EQ: 678 yes = entry->dport == op[1].no; 679 break; 680 case INET_DIAG_BC_D_GE: 681 yes = entry->dport >= op[1].no; 682 break; 683 case INET_DIAG_BC_D_LE: 684 yes = entry->dport <= op[1].no; 685 break; 686 case INET_DIAG_BC_AUTO: 687 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 688 break; 689 case INET_DIAG_BC_S_COND: 690 case INET_DIAG_BC_D_COND: { 691 const struct inet_diag_hostcond *cond; 692 const __be32 *addr; 693 694 cond = (const struct inet_diag_hostcond *)(op + 1); 695 if (cond->port != -1 && 696 cond->port != (op->code == INET_DIAG_BC_S_COND ? 697 entry->sport : entry->dport)) { 698 yes = 0; 699 break; 700 } 701 702 if (op->code == INET_DIAG_BC_S_COND) 703 addr = entry->saddr; 704 else 705 addr = entry->daddr; 706 707 if (cond->family != AF_UNSPEC && 708 cond->family != entry->family) { 709 if (entry->family == AF_INET6 && 710 cond->family == AF_INET) { 711 if (addr[0] == 0 && addr[1] == 0 && 712 addr[2] == htonl(0xffff) && 713 bitstring_match(addr + 3, 714 cond->addr, 715 cond->prefix_len)) 716 break; 717 } 718 yes = 0; 719 break; 720 } 721 722 if (cond->prefix_len == 0) 723 break; 724 if (bitstring_match(addr, cond->addr, 725 cond->prefix_len)) 726 break; 727 yes = 0; 728 break; 729 } 730 case INET_DIAG_BC_DEV_COND: { 731 u32 ifindex; 732 733 ifindex = *((const u32 *)(op + 1)); 734 if (ifindex != entry->ifindex) 735 yes = 0; 736 break; 737 } 738 case INET_DIAG_BC_MARK_COND: { 739 struct inet_diag_markcond *cond; 740 741 cond = (struct inet_diag_markcond *)(op + 1); 742 if ((entry->mark & cond->mask) != cond->mark) 743 yes = 0; 744 break; 745 } 746 #ifdef CONFIG_SOCK_CGROUP_DATA 747 case INET_DIAG_BC_CGROUP_COND: { 748 u64 cgroup_id; 749 750 cgroup_id = get_unaligned((const u64 *)(op + 1)); 751 if (cgroup_id != entry->cgroup_id) 752 yes = 0; 753 break; 754 } 755 #endif 756 } 757 758 if (yes) { 759 len -= op->yes; 760 bc += op->yes; 761 } else { 762 len -= op->no; 763 bc += op->no; 764 } 765 } 766 return len == 0; 767 } 768 769 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV) 770 */ 771 static void entry_fill_addrs(struct inet_diag_entry *entry, 772 const struct sock *sk) 773 { 774 #if IS_ENABLED(CONFIG_IPV6) 775 if (sk->sk_family == AF_INET6) { 776 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32; 777 entry->daddr = sk->sk_v6_daddr.s6_addr32; 778 } else 779 #endif 780 { 781 entry->saddr = &sk->sk_rcv_saddr; 782 entry->daddr = &sk->sk_daddr; 783 } 784 } 785 786 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) 787 { 788 struct inet_sock *inet = inet_sk(sk); 789 struct inet_diag_entry entry; 790 791 if (!bc) 792 return 1; 793 794 entry.family = sk->sk_family; 795 entry_fill_addrs(&entry, sk); 796 entry.sport = inet->inet_num; 797 entry.dport = ntohs(inet->inet_dport); 798 entry.ifindex = sk->sk_bound_dev_if; 799 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0; 800 if (sk_fullsock(sk)) 801 entry.mark = sk->sk_mark; 802 else if (sk->sk_state == TCP_NEW_SYN_RECV) 803 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark; 804 else 805 entry.mark = 0; 806 #ifdef CONFIG_SOCK_CGROUP_DATA 807 entry.cgroup_id = sk_fullsock(sk) ? 808 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)) : 0; 809 #endif 810 811 return inet_diag_bc_run(bc, &entry); 812 } 813 EXPORT_SYMBOL_GPL(inet_diag_bc_sk); 814 815 static int valid_cc(const void *bc, int len, int cc) 816 { 817 while (len >= 0) { 818 const struct inet_diag_bc_op *op = bc; 819 820 if (cc > len) 821 return 0; 822 if (cc == len) 823 return 1; 824 if (op->yes < 4 || op->yes & 3) 825 return 0; 826 len -= op->yes; 827 bc += op->yes; 828 } 829 return 0; 830 } 831 832 /* data is u32 ifindex */ 833 static bool valid_devcond(const struct inet_diag_bc_op *op, int len, 834 int *min_len) 835 { 836 /* Check ifindex space. */ 837 *min_len += sizeof(u32); 838 if (len < *min_len) 839 return false; 840 841 return true; 842 } 843 /* Validate an inet_diag_hostcond. */ 844 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len, 845 int *min_len) 846 { 847 struct inet_diag_hostcond *cond; 848 int addr_len; 849 850 /* Check hostcond space. */ 851 *min_len += sizeof(struct inet_diag_hostcond); 852 if (len < *min_len) 853 return false; 854 cond = (struct inet_diag_hostcond *)(op + 1); 855 856 /* Check address family and address length. */ 857 switch (cond->family) { 858 case AF_UNSPEC: 859 addr_len = 0; 860 break; 861 case AF_INET: 862 addr_len = sizeof(struct in_addr); 863 break; 864 case AF_INET6: 865 addr_len = sizeof(struct in6_addr); 866 break; 867 default: 868 return false; 869 } 870 *min_len += addr_len; 871 if (len < *min_len) 872 return false; 873 874 /* Check prefix length (in bits) vs address length (in bytes). */ 875 if (cond->prefix_len > 8 * addr_len) 876 return false; 877 878 return true; 879 } 880 881 /* Validate a port comparison operator. */ 882 static bool valid_port_comparison(const struct inet_diag_bc_op *op, 883 int len, int *min_len) 884 { 885 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */ 886 *min_len += sizeof(struct inet_diag_bc_op); 887 if (len < *min_len) 888 return false; 889 return true; 890 } 891 892 static bool valid_markcond(const struct inet_diag_bc_op *op, int len, 893 int *min_len) 894 { 895 *min_len += sizeof(struct inet_diag_markcond); 896 return len >= *min_len; 897 } 898 899 #ifdef CONFIG_SOCK_CGROUP_DATA 900 static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len, 901 int *min_len) 902 { 903 *min_len += sizeof(u64); 904 return len >= *min_len; 905 } 906 #endif 907 908 static int inet_diag_bc_audit(const struct nlattr *attr, 909 const struct sk_buff *skb) 910 { 911 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN); 912 const void *bytecode, *bc; 913 int bytecode_len, len; 914 915 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op)) 916 return -EINVAL; 917 918 bytecode = bc = nla_data(attr); 919 len = bytecode_len = nla_len(attr); 920 921 while (len > 0) { 922 int min_len = sizeof(struct inet_diag_bc_op); 923 const struct inet_diag_bc_op *op = bc; 924 925 switch (op->code) { 926 case INET_DIAG_BC_S_COND: 927 case INET_DIAG_BC_D_COND: 928 if (!valid_hostcond(bc, len, &min_len)) 929 return -EINVAL; 930 break; 931 case INET_DIAG_BC_DEV_COND: 932 if (!valid_devcond(bc, len, &min_len)) 933 return -EINVAL; 934 break; 935 case INET_DIAG_BC_S_EQ: 936 case INET_DIAG_BC_S_GE: 937 case INET_DIAG_BC_S_LE: 938 case INET_DIAG_BC_D_EQ: 939 case INET_DIAG_BC_D_GE: 940 case INET_DIAG_BC_D_LE: 941 if (!valid_port_comparison(bc, len, &min_len)) 942 return -EINVAL; 943 break; 944 case INET_DIAG_BC_MARK_COND: 945 if (!net_admin) 946 return -EPERM; 947 if (!valid_markcond(bc, len, &min_len)) 948 return -EINVAL; 949 break; 950 #ifdef CONFIG_SOCK_CGROUP_DATA 951 case INET_DIAG_BC_CGROUP_COND: 952 if (!valid_cgroupcond(bc, len, &min_len)) 953 return -EINVAL; 954 break; 955 #endif 956 case INET_DIAG_BC_AUTO: 957 case INET_DIAG_BC_JMP: 958 case INET_DIAG_BC_NOP: 959 break; 960 default: 961 return -EINVAL; 962 } 963 964 if (op->code != INET_DIAG_BC_NOP) { 965 if (op->no < min_len || op->no > len + 4 || op->no & 3) 966 return -EINVAL; 967 if (op->no < len && 968 !valid_cc(bytecode, bytecode_len, len - op->no)) 969 return -EINVAL; 970 } 971 972 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3) 973 return -EINVAL; 974 bc += op->yes; 975 len -= op->yes; 976 } 977 return len == 0 ? 0 : -EINVAL; 978 } 979 980 static void twsk_build_assert(void) 981 { 982 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) != 983 offsetof(struct sock, sk_family)); 984 985 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) != 986 offsetof(struct inet_sock, inet_num)); 987 988 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) != 989 offsetof(struct inet_sock, inet_dport)); 990 991 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) != 992 offsetof(struct inet_sock, inet_rcv_saddr)); 993 994 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) != 995 offsetof(struct inet_sock, inet_daddr)); 996 997 #if IS_ENABLED(CONFIG_IPV6) 998 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) != 999 offsetof(struct sock, sk_v6_rcv_saddr)); 1000 1001 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) != 1002 offsetof(struct sock, sk_v6_daddr)); 1003 #endif 1004 } 1005 1006 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, 1007 struct netlink_callback *cb, 1008 const struct inet_diag_req_v2 *r) 1009 { 1010 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN); 1011 struct inet_diag_dump_data *cb_data = cb->data; 1012 struct net *net = sock_net(skb->sk); 1013 u32 idiag_states = r->idiag_states; 1014 int i, num, s_i, s_num; 1015 struct nlattr *bc; 1016 struct sock *sk; 1017 1018 bc = cb_data->inet_diag_nla_bc; 1019 if (idiag_states & TCPF_SYN_RECV) 1020 idiag_states |= TCPF_NEW_SYN_RECV; 1021 s_i = cb->args[1]; 1022 s_num = num = cb->args[2]; 1023 1024 if (cb->args[0] == 0) { 1025 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport) 1026 goto skip_listen_ht; 1027 1028 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 1029 struct inet_listen_hashbucket *ilb; 1030 struct hlist_nulls_node *node; 1031 1032 num = 0; 1033 ilb = &hashinfo->listening_hash[i]; 1034 spin_lock(&ilb->lock); 1035 sk_nulls_for_each(sk, node, &ilb->nulls_head) { 1036 struct inet_sock *inet = inet_sk(sk); 1037 1038 if (!net_eq(sock_net(sk), net)) 1039 continue; 1040 1041 if (num < s_num) { 1042 num++; 1043 continue; 1044 } 1045 1046 if (r->sdiag_family != AF_UNSPEC && 1047 sk->sk_family != r->sdiag_family) 1048 goto next_listen; 1049 1050 if (r->id.idiag_sport != inet->inet_sport && 1051 r->id.idiag_sport) 1052 goto next_listen; 1053 1054 if (!inet_diag_bc_sk(bc, sk)) 1055 goto next_listen; 1056 1057 if (inet_sk_diag_fill(sk, inet_csk(sk), skb, 1058 cb, r, NLM_F_MULTI, 1059 net_admin) < 0) { 1060 spin_unlock(&ilb->lock); 1061 goto done; 1062 } 1063 1064 next_listen: 1065 ++num; 1066 } 1067 spin_unlock(&ilb->lock); 1068 1069 s_num = 0; 1070 } 1071 skip_listen_ht: 1072 cb->args[0] = 1; 1073 s_i = num = s_num = 0; 1074 } 1075 1076 if (!(idiag_states & ~TCPF_LISTEN)) 1077 goto out; 1078 1079 #define SKARR_SZ 16 1080 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 1081 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 1082 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 1083 struct hlist_nulls_node *node; 1084 struct sock *sk_arr[SKARR_SZ]; 1085 int num_arr[SKARR_SZ]; 1086 int idx, accum, res; 1087 1088 if (hlist_nulls_empty(&head->chain)) 1089 continue; 1090 1091 if (i > s_i) 1092 s_num = 0; 1093 1094 next_chunk: 1095 num = 0; 1096 accum = 0; 1097 spin_lock_bh(lock); 1098 sk_nulls_for_each(sk, node, &head->chain) { 1099 int state; 1100 1101 if (!net_eq(sock_net(sk), net)) 1102 continue; 1103 if (num < s_num) 1104 goto next_normal; 1105 state = (sk->sk_state == TCP_TIME_WAIT) ? 1106 inet_twsk(sk)->tw_substate : sk->sk_state; 1107 if (!(idiag_states & (1 << state))) 1108 goto next_normal; 1109 if (r->sdiag_family != AF_UNSPEC && 1110 sk->sk_family != r->sdiag_family) 1111 goto next_normal; 1112 if (r->id.idiag_sport != htons(sk->sk_num) && 1113 r->id.idiag_sport) 1114 goto next_normal; 1115 if (r->id.idiag_dport != sk->sk_dport && 1116 r->id.idiag_dport) 1117 goto next_normal; 1118 twsk_build_assert(); 1119 1120 if (!inet_diag_bc_sk(bc, sk)) 1121 goto next_normal; 1122 1123 if (!refcount_inc_not_zero(&sk->sk_refcnt)) 1124 goto next_normal; 1125 1126 num_arr[accum] = num; 1127 sk_arr[accum] = sk; 1128 if (++accum == SKARR_SZ) 1129 break; 1130 next_normal: 1131 ++num; 1132 } 1133 spin_unlock_bh(lock); 1134 res = 0; 1135 for (idx = 0; idx < accum; idx++) { 1136 if (res >= 0) { 1137 res = sk_diag_fill(sk_arr[idx], skb, cb, r, 1138 NLM_F_MULTI, net_admin); 1139 if (res < 0) 1140 num = num_arr[idx]; 1141 } 1142 sock_gen_put(sk_arr[idx]); 1143 } 1144 if (res < 0) 1145 break; 1146 cond_resched(); 1147 if (accum == SKARR_SZ) { 1148 s_num = num + 1; 1149 goto next_chunk; 1150 } 1151 } 1152 1153 done: 1154 cb->args[1] = i; 1155 cb->args[2] = num; 1156 out: 1157 ; 1158 } 1159 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk); 1160 1161 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 1162 const struct inet_diag_req_v2 *r) 1163 { 1164 struct inet_diag_dump_data *cb_data = cb->data; 1165 const struct inet_diag_handler *handler; 1166 u32 prev_min_dump_alloc; 1167 int protocol, err = 0; 1168 1169 protocol = inet_diag_get_protocol(r, cb_data); 1170 1171 again: 1172 prev_min_dump_alloc = cb->min_dump_alloc; 1173 handler = inet_diag_lock_handler(protocol); 1174 if (!IS_ERR(handler)) 1175 handler->dump(skb, cb, r); 1176 else 1177 err = PTR_ERR(handler); 1178 inet_diag_unlock_handler(handler); 1179 1180 /* The skb is not large enough to fit one sk info and 1181 * inet_sk_diag_fill() has requested for a larger skb. 1182 */ 1183 if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) { 1184 err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL); 1185 if (!err) 1186 goto again; 1187 } 1188 1189 return err ? : skb->len; 1190 } 1191 1192 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 1193 { 1194 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh)); 1195 } 1196 1197 static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen) 1198 { 1199 const struct nlmsghdr *nlh = cb->nlh; 1200 struct inet_diag_dump_data *cb_data; 1201 struct sk_buff *skb = cb->skb; 1202 struct nlattr *nla; 1203 int err; 1204 1205 cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL); 1206 if (!cb_data) 1207 return -ENOMEM; 1208 1209 err = inet_diag_parse_attrs(nlh, hdrlen, cb_data->req_nlas); 1210 if (err) { 1211 kfree(cb_data); 1212 return err; 1213 } 1214 nla = cb_data->inet_diag_nla_bc; 1215 if (nla) { 1216 err = inet_diag_bc_audit(nla, skb); 1217 if (err) { 1218 kfree(cb_data); 1219 return err; 1220 } 1221 } 1222 1223 nla = cb_data->inet_diag_nla_bpf_stgs; 1224 if (nla) { 1225 struct bpf_sk_storage_diag *bpf_stg_diag; 1226 1227 bpf_stg_diag = bpf_sk_storage_diag_alloc(nla); 1228 if (IS_ERR(bpf_stg_diag)) { 1229 kfree(cb_data); 1230 return PTR_ERR(bpf_stg_diag); 1231 } 1232 cb_data->bpf_stg_diag = bpf_stg_diag; 1233 } 1234 1235 cb->data = cb_data; 1236 return 0; 1237 } 1238 1239 static int inet_diag_dump_start(struct netlink_callback *cb) 1240 { 1241 return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2)); 1242 } 1243 1244 static int inet_diag_dump_start_compat(struct netlink_callback *cb) 1245 { 1246 return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req)); 1247 } 1248 1249 static int inet_diag_dump_done(struct netlink_callback *cb) 1250 { 1251 struct inet_diag_dump_data *cb_data = cb->data; 1252 1253 bpf_sk_storage_diag_free(cb_data->bpf_stg_diag); 1254 kfree(cb->data); 1255 1256 return 0; 1257 } 1258 1259 static int inet_diag_type2proto(int type) 1260 { 1261 switch (type) { 1262 case TCPDIAG_GETSOCK: 1263 return IPPROTO_TCP; 1264 case DCCPDIAG_GETSOCK: 1265 return IPPROTO_DCCP; 1266 default: 1267 return 0; 1268 } 1269 } 1270 1271 static int inet_diag_dump_compat(struct sk_buff *skb, 1272 struct netlink_callback *cb) 1273 { 1274 struct inet_diag_req *rc = nlmsg_data(cb->nlh); 1275 struct inet_diag_req_v2 req; 1276 1277 req.sdiag_family = AF_UNSPEC; /* compatibility */ 1278 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 1279 req.idiag_ext = rc->idiag_ext; 1280 req.idiag_states = rc->idiag_states; 1281 req.id = rc->id; 1282 1283 return __inet_diag_dump(skb, cb, &req); 1284 } 1285 1286 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 1287 const struct nlmsghdr *nlh) 1288 { 1289 struct inet_diag_req *rc = nlmsg_data(nlh); 1290 struct inet_diag_req_v2 req; 1291 1292 req.sdiag_family = rc->idiag_family; 1293 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 1294 req.idiag_ext = rc->idiag_ext; 1295 req.idiag_states = rc->idiag_states; 1296 req.id = rc->id; 1297 1298 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, 1299 sizeof(struct inet_diag_req), &req); 1300 } 1301 1302 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 1303 { 1304 int hdrlen = sizeof(struct inet_diag_req); 1305 struct net *net = sock_net(skb->sk); 1306 1307 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 1308 nlmsg_len(nlh) < hdrlen) 1309 return -EINVAL; 1310 1311 if (nlh->nlmsg_flags & NLM_F_DUMP) { 1312 struct netlink_dump_control c = { 1313 .start = inet_diag_dump_start_compat, 1314 .done = inet_diag_dump_done, 1315 .dump = inet_diag_dump_compat, 1316 }; 1317 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c); 1318 } 1319 1320 return inet_diag_get_exact_compat(skb, nlh); 1321 } 1322 1323 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h) 1324 { 1325 int hdrlen = sizeof(struct inet_diag_req_v2); 1326 struct net *net = sock_net(skb->sk); 1327 1328 if (nlmsg_len(h) < hdrlen) 1329 return -EINVAL; 1330 1331 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY && 1332 h->nlmsg_flags & NLM_F_DUMP) { 1333 struct netlink_dump_control c = { 1334 .start = inet_diag_dump_start, 1335 .done = inet_diag_dump_done, 1336 .dump = inet_diag_dump, 1337 }; 1338 return netlink_dump_start(net->diag_nlsk, skb, h, &c); 1339 } 1340 1341 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, hdrlen, 1342 nlmsg_data(h)); 1343 } 1344 1345 static 1346 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk) 1347 { 1348 const struct inet_diag_handler *handler; 1349 struct nlmsghdr *nlh; 1350 struct nlattr *attr; 1351 struct inet_diag_msg *r; 1352 void *info = NULL; 1353 int err = 0; 1354 1355 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0); 1356 if (!nlh) 1357 return -ENOMEM; 1358 1359 r = nlmsg_data(nlh); 1360 memset(r, 0, sizeof(*r)); 1361 inet_diag_msg_common_fill(r, sk); 1362 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM) 1363 r->id.idiag_sport = inet_sk(sk)->inet_sport; 1364 r->idiag_state = sk->sk_state; 1365 1366 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) { 1367 nlmsg_cancel(skb, nlh); 1368 return err; 1369 } 1370 1371 handler = inet_diag_lock_handler(sk->sk_protocol); 1372 if (IS_ERR(handler)) { 1373 inet_diag_unlock_handler(handler); 1374 nlmsg_cancel(skb, nlh); 1375 return PTR_ERR(handler); 1376 } 1377 1378 attr = handler->idiag_info_size 1379 ? nla_reserve_64bit(skb, INET_DIAG_INFO, 1380 handler->idiag_info_size, 1381 INET_DIAG_PAD) 1382 : NULL; 1383 if (attr) 1384 info = nla_data(attr); 1385 1386 handler->idiag_get_info(sk, r, info); 1387 inet_diag_unlock_handler(handler); 1388 1389 nlmsg_end(skb, nlh); 1390 return 0; 1391 } 1392 1393 static const struct sock_diag_handler inet_diag_handler = { 1394 .family = AF_INET, 1395 .dump = inet_diag_handler_cmd, 1396 .get_info = inet_diag_handler_get_info, 1397 .destroy = inet_diag_handler_cmd, 1398 }; 1399 1400 static const struct sock_diag_handler inet6_diag_handler = { 1401 .family = AF_INET6, 1402 .dump = inet_diag_handler_cmd, 1403 .get_info = inet_diag_handler_get_info, 1404 .destroy = inet_diag_handler_cmd, 1405 }; 1406 1407 int inet_diag_register(const struct inet_diag_handler *h) 1408 { 1409 const __u16 type = h->idiag_type; 1410 int err = -EINVAL; 1411 1412 if (type >= IPPROTO_MAX) 1413 goto out; 1414 1415 mutex_lock(&inet_diag_table_mutex); 1416 err = -EEXIST; 1417 if (!inet_diag_table[type]) { 1418 inet_diag_table[type] = h; 1419 err = 0; 1420 } 1421 mutex_unlock(&inet_diag_table_mutex); 1422 out: 1423 return err; 1424 } 1425 EXPORT_SYMBOL_GPL(inet_diag_register); 1426 1427 void inet_diag_unregister(const struct inet_diag_handler *h) 1428 { 1429 const __u16 type = h->idiag_type; 1430 1431 if (type >= IPPROTO_MAX) 1432 return; 1433 1434 mutex_lock(&inet_diag_table_mutex); 1435 inet_diag_table[type] = NULL; 1436 mutex_unlock(&inet_diag_table_mutex); 1437 } 1438 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1439 1440 static int __init inet_diag_init(void) 1441 { 1442 const int inet_diag_table_size = (IPPROTO_MAX * 1443 sizeof(struct inet_diag_handler *)); 1444 int err = -ENOMEM; 1445 1446 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1447 if (!inet_diag_table) 1448 goto out; 1449 1450 err = sock_diag_register(&inet_diag_handler); 1451 if (err) 1452 goto out_free_nl; 1453 1454 err = sock_diag_register(&inet6_diag_handler); 1455 if (err) 1456 goto out_free_inet; 1457 1458 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1459 out: 1460 return err; 1461 1462 out_free_inet: 1463 sock_diag_unregister(&inet_diag_handler); 1464 out_free_nl: 1465 kfree(inet_diag_table); 1466 goto out; 1467 } 1468 1469 static void __exit inet_diag_exit(void) 1470 { 1471 sock_diag_unregister(&inet6_diag_handler); 1472 sock_diag_unregister(&inet_diag_handler); 1473 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1474 kfree(inet_diag_table); 1475 } 1476 1477 module_init(inet_diag_init); 1478 module_exit(inet_diag_exit); 1479 MODULE_LICENSE("GPL"); 1480 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */); 1481 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */); 1482