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 return -EMSGSIZE; 484 485 nlmsg_end(skb, nlh); 486 return 0; 487 } 488 489 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 490 struct netlink_callback *cb, 491 const struct inet_diag_req_v2 *r, 492 u16 nlmsg_flags, bool net_admin) 493 { 494 if (sk->sk_state == TCP_TIME_WAIT) 495 return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags); 496 497 if (sk->sk_state == TCP_NEW_SYN_RECV) 498 return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin); 499 500 return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags, 501 net_admin); 502 } 503 504 struct sock *inet_diag_find_one_icsk(struct net *net, 505 struct inet_hashinfo *hashinfo, 506 const struct inet_diag_req_v2 *req) 507 { 508 struct sock *sk; 509 510 rcu_read_lock(); 511 if (req->sdiag_family == AF_INET) 512 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0], 513 req->id.idiag_dport, req->id.idiag_src[0], 514 req->id.idiag_sport, req->id.idiag_if); 515 #if IS_ENABLED(CONFIG_IPV6) 516 else if (req->sdiag_family == AF_INET6) { 517 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) && 518 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src)) 519 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3], 520 req->id.idiag_dport, req->id.idiag_src[3], 521 req->id.idiag_sport, req->id.idiag_if); 522 else 523 sk = inet6_lookup(net, hashinfo, NULL, 0, 524 (struct in6_addr *)req->id.idiag_dst, 525 req->id.idiag_dport, 526 (struct in6_addr *)req->id.idiag_src, 527 req->id.idiag_sport, 528 req->id.idiag_if); 529 } 530 #endif 531 else { 532 rcu_read_unlock(); 533 return ERR_PTR(-EINVAL); 534 } 535 rcu_read_unlock(); 536 if (!sk) 537 return ERR_PTR(-ENOENT); 538 539 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) { 540 sock_gen_put(sk); 541 return ERR_PTR(-ENOENT); 542 } 543 544 return sk; 545 } 546 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk); 547 548 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, 549 struct netlink_callback *cb, 550 const struct inet_diag_req_v2 *req) 551 { 552 struct sk_buff *in_skb = cb->skb; 553 bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN); 554 struct net *net = sock_net(in_skb->sk); 555 struct sk_buff *rep; 556 struct sock *sk; 557 int err; 558 559 sk = inet_diag_find_one_icsk(net, hashinfo, req); 560 if (IS_ERR(sk)) 561 return PTR_ERR(sk); 562 563 rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL); 564 if (!rep) { 565 err = -ENOMEM; 566 goto out; 567 } 568 569 err = sk_diag_fill(sk, rep, cb, req, 0, net_admin); 570 if (err < 0) { 571 WARN_ON(err == -EMSGSIZE); 572 nlmsg_free(rep); 573 goto out; 574 } 575 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid, 576 MSG_DONTWAIT); 577 if (err > 0) 578 err = 0; 579 580 out: 581 if (sk) 582 sock_gen_put(sk); 583 584 return err; 585 } 586 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk); 587 588 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb, 589 const struct nlmsghdr *nlh, 590 int hdrlen, 591 const struct inet_diag_req_v2 *req) 592 { 593 const struct inet_diag_handler *handler; 594 struct inet_diag_dump_data dump_data; 595 int err, protocol; 596 597 memset(&dump_data, 0, sizeof(dump_data)); 598 err = inet_diag_parse_attrs(nlh, hdrlen, dump_data.req_nlas); 599 if (err) 600 return err; 601 602 protocol = inet_diag_get_protocol(req, &dump_data); 603 604 handler = inet_diag_lock_handler(protocol); 605 if (IS_ERR(handler)) { 606 err = PTR_ERR(handler); 607 } else if (cmd == SOCK_DIAG_BY_FAMILY) { 608 struct netlink_callback cb = { 609 .nlh = nlh, 610 .skb = in_skb, 611 .data = &dump_data, 612 }; 613 err = handler->dump_one(&cb, req); 614 } else if (cmd == SOCK_DESTROY && handler->destroy) { 615 err = handler->destroy(in_skb, req); 616 } else { 617 err = -EOPNOTSUPP; 618 } 619 inet_diag_unlock_handler(handler); 620 621 return err; 622 } 623 624 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 625 { 626 int words = bits >> 5; 627 628 bits &= 0x1f; 629 630 if (words) { 631 if (memcmp(a1, a2, words << 2)) 632 return 0; 633 } 634 if (bits) { 635 __be32 w1, w2; 636 __be32 mask; 637 638 w1 = a1[words]; 639 w2 = a2[words]; 640 641 mask = htonl((0xffffffff) << (32 - bits)); 642 643 if ((w1 ^ w2) & mask) 644 return 0; 645 } 646 647 return 1; 648 } 649 650 static int inet_diag_bc_run(const struct nlattr *_bc, 651 const struct inet_diag_entry *entry) 652 { 653 const void *bc = nla_data(_bc); 654 int len = nla_len(_bc); 655 656 while (len > 0) { 657 int yes = 1; 658 const struct inet_diag_bc_op *op = bc; 659 660 switch (op->code) { 661 case INET_DIAG_BC_NOP: 662 break; 663 case INET_DIAG_BC_JMP: 664 yes = 0; 665 break; 666 case INET_DIAG_BC_S_EQ: 667 yes = entry->sport == op[1].no; 668 break; 669 case INET_DIAG_BC_S_GE: 670 yes = entry->sport >= op[1].no; 671 break; 672 case INET_DIAG_BC_S_LE: 673 yes = entry->sport <= op[1].no; 674 break; 675 case INET_DIAG_BC_D_EQ: 676 yes = entry->dport == op[1].no; 677 break; 678 case INET_DIAG_BC_D_GE: 679 yes = entry->dport >= op[1].no; 680 break; 681 case INET_DIAG_BC_D_LE: 682 yes = entry->dport <= op[1].no; 683 break; 684 case INET_DIAG_BC_AUTO: 685 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 686 break; 687 case INET_DIAG_BC_S_COND: 688 case INET_DIAG_BC_D_COND: { 689 const struct inet_diag_hostcond *cond; 690 const __be32 *addr; 691 692 cond = (const struct inet_diag_hostcond *)(op + 1); 693 if (cond->port != -1 && 694 cond->port != (op->code == INET_DIAG_BC_S_COND ? 695 entry->sport : entry->dport)) { 696 yes = 0; 697 break; 698 } 699 700 if (op->code == INET_DIAG_BC_S_COND) 701 addr = entry->saddr; 702 else 703 addr = entry->daddr; 704 705 if (cond->family != AF_UNSPEC && 706 cond->family != entry->family) { 707 if (entry->family == AF_INET6 && 708 cond->family == AF_INET) { 709 if (addr[0] == 0 && addr[1] == 0 && 710 addr[2] == htonl(0xffff) && 711 bitstring_match(addr + 3, 712 cond->addr, 713 cond->prefix_len)) 714 break; 715 } 716 yes = 0; 717 break; 718 } 719 720 if (cond->prefix_len == 0) 721 break; 722 if (bitstring_match(addr, cond->addr, 723 cond->prefix_len)) 724 break; 725 yes = 0; 726 break; 727 } 728 case INET_DIAG_BC_DEV_COND: { 729 u32 ifindex; 730 731 ifindex = *((const u32 *)(op + 1)); 732 if (ifindex != entry->ifindex) 733 yes = 0; 734 break; 735 } 736 case INET_DIAG_BC_MARK_COND: { 737 struct inet_diag_markcond *cond; 738 739 cond = (struct inet_diag_markcond *)(op + 1); 740 if ((entry->mark & cond->mask) != cond->mark) 741 yes = 0; 742 break; 743 } 744 #ifdef CONFIG_SOCK_CGROUP_DATA 745 case INET_DIAG_BC_CGROUP_COND: { 746 u64 cgroup_id; 747 748 cgroup_id = get_unaligned((const u64 *)(op + 1)); 749 if (cgroup_id != entry->cgroup_id) 750 yes = 0; 751 break; 752 } 753 #endif 754 } 755 756 if (yes) { 757 len -= op->yes; 758 bc += op->yes; 759 } else { 760 len -= op->no; 761 bc += op->no; 762 } 763 } 764 return len == 0; 765 } 766 767 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV) 768 */ 769 static void entry_fill_addrs(struct inet_diag_entry *entry, 770 const struct sock *sk) 771 { 772 #if IS_ENABLED(CONFIG_IPV6) 773 if (sk->sk_family == AF_INET6) { 774 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32; 775 entry->daddr = sk->sk_v6_daddr.s6_addr32; 776 } else 777 #endif 778 { 779 entry->saddr = &sk->sk_rcv_saddr; 780 entry->daddr = &sk->sk_daddr; 781 } 782 } 783 784 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) 785 { 786 struct inet_sock *inet = inet_sk(sk); 787 struct inet_diag_entry entry; 788 789 if (!bc) 790 return 1; 791 792 entry.family = sk->sk_family; 793 entry_fill_addrs(&entry, sk); 794 entry.sport = inet->inet_num; 795 entry.dport = ntohs(inet->inet_dport); 796 entry.ifindex = sk->sk_bound_dev_if; 797 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0; 798 if (sk_fullsock(sk)) 799 entry.mark = sk->sk_mark; 800 else if (sk->sk_state == TCP_NEW_SYN_RECV) 801 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark; 802 else 803 entry.mark = 0; 804 #ifdef CONFIG_SOCK_CGROUP_DATA 805 entry.cgroup_id = sk_fullsock(sk) ? 806 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)) : 0; 807 #endif 808 809 return inet_diag_bc_run(bc, &entry); 810 } 811 EXPORT_SYMBOL_GPL(inet_diag_bc_sk); 812 813 static int valid_cc(const void *bc, int len, int cc) 814 { 815 while (len >= 0) { 816 const struct inet_diag_bc_op *op = bc; 817 818 if (cc > len) 819 return 0; 820 if (cc == len) 821 return 1; 822 if (op->yes < 4 || op->yes & 3) 823 return 0; 824 len -= op->yes; 825 bc += op->yes; 826 } 827 return 0; 828 } 829 830 /* data is u32 ifindex */ 831 static bool valid_devcond(const struct inet_diag_bc_op *op, int len, 832 int *min_len) 833 { 834 /* Check ifindex space. */ 835 *min_len += sizeof(u32); 836 if (len < *min_len) 837 return false; 838 839 return true; 840 } 841 /* Validate an inet_diag_hostcond. */ 842 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len, 843 int *min_len) 844 { 845 struct inet_diag_hostcond *cond; 846 int addr_len; 847 848 /* Check hostcond space. */ 849 *min_len += sizeof(struct inet_diag_hostcond); 850 if (len < *min_len) 851 return false; 852 cond = (struct inet_diag_hostcond *)(op + 1); 853 854 /* Check address family and address length. */ 855 switch (cond->family) { 856 case AF_UNSPEC: 857 addr_len = 0; 858 break; 859 case AF_INET: 860 addr_len = sizeof(struct in_addr); 861 break; 862 case AF_INET6: 863 addr_len = sizeof(struct in6_addr); 864 break; 865 default: 866 return false; 867 } 868 *min_len += addr_len; 869 if (len < *min_len) 870 return false; 871 872 /* Check prefix length (in bits) vs address length (in bytes). */ 873 if (cond->prefix_len > 8 * addr_len) 874 return false; 875 876 return true; 877 } 878 879 /* Validate a port comparison operator. */ 880 static bool valid_port_comparison(const struct inet_diag_bc_op *op, 881 int len, int *min_len) 882 { 883 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */ 884 *min_len += sizeof(struct inet_diag_bc_op); 885 if (len < *min_len) 886 return false; 887 return true; 888 } 889 890 static bool valid_markcond(const struct inet_diag_bc_op *op, int len, 891 int *min_len) 892 { 893 *min_len += sizeof(struct inet_diag_markcond); 894 return len >= *min_len; 895 } 896 897 #ifdef CONFIG_SOCK_CGROUP_DATA 898 static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len, 899 int *min_len) 900 { 901 *min_len += sizeof(u64); 902 return len >= *min_len; 903 } 904 #endif 905 906 static int inet_diag_bc_audit(const struct nlattr *attr, 907 const struct sk_buff *skb) 908 { 909 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN); 910 const void *bytecode, *bc; 911 int bytecode_len, len; 912 913 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op)) 914 return -EINVAL; 915 916 bytecode = bc = nla_data(attr); 917 len = bytecode_len = nla_len(attr); 918 919 while (len > 0) { 920 int min_len = sizeof(struct inet_diag_bc_op); 921 const struct inet_diag_bc_op *op = bc; 922 923 switch (op->code) { 924 case INET_DIAG_BC_S_COND: 925 case INET_DIAG_BC_D_COND: 926 if (!valid_hostcond(bc, len, &min_len)) 927 return -EINVAL; 928 break; 929 case INET_DIAG_BC_DEV_COND: 930 if (!valid_devcond(bc, len, &min_len)) 931 return -EINVAL; 932 break; 933 case INET_DIAG_BC_S_EQ: 934 case INET_DIAG_BC_S_GE: 935 case INET_DIAG_BC_S_LE: 936 case INET_DIAG_BC_D_EQ: 937 case INET_DIAG_BC_D_GE: 938 case INET_DIAG_BC_D_LE: 939 if (!valid_port_comparison(bc, len, &min_len)) 940 return -EINVAL; 941 break; 942 case INET_DIAG_BC_MARK_COND: 943 if (!net_admin) 944 return -EPERM; 945 if (!valid_markcond(bc, len, &min_len)) 946 return -EINVAL; 947 break; 948 #ifdef CONFIG_SOCK_CGROUP_DATA 949 case INET_DIAG_BC_CGROUP_COND: 950 if (!valid_cgroupcond(bc, len, &min_len)) 951 return -EINVAL; 952 break; 953 #endif 954 case INET_DIAG_BC_AUTO: 955 case INET_DIAG_BC_JMP: 956 case INET_DIAG_BC_NOP: 957 break; 958 default: 959 return -EINVAL; 960 } 961 962 if (op->code != INET_DIAG_BC_NOP) { 963 if (op->no < min_len || op->no > len + 4 || op->no & 3) 964 return -EINVAL; 965 if (op->no < len && 966 !valid_cc(bytecode, bytecode_len, len - op->no)) 967 return -EINVAL; 968 } 969 970 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3) 971 return -EINVAL; 972 bc += op->yes; 973 len -= op->yes; 974 } 975 return len == 0 ? 0 : -EINVAL; 976 } 977 978 static void twsk_build_assert(void) 979 { 980 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) != 981 offsetof(struct sock, sk_family)); 982 983 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) != 984 offsetof(struct inet_sock, inet_num)); 985 986 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) != 987 offsetof(struct inet_sock, inet_dport)); 988 989 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) != 990 offsetof(struct inet_sock, inet_rcv_saddr)); 991 992 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) != 993 offsetof(struct inet_sock, inet_daddr)); 994 995 #if IS_ENABLED(CONFIG_IPV6) 996 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) != 997 offsetof(struct sock, sk_v6_rcv_saddr)); 998 999 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) != 1000 offsetof(struct sock, sk_v6_daddr)); 1001 #endif 1002 } 1003 1004 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, 1005 struct netlink_callback *cb, 1006 const struct inet_diag_req_v2 *r) 1007 { 1008 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN); 1009 struct inet_diag_dump_data *cb_data = cb->data; 1010 struct net *net = sock_net(skb->sk); 1011 u32 idiag_states = r->idiag_states; 1012 int i, num, s_i, s_num; 1013 struct nlattr *bc; 1014 struct sock *sk; 1015 1016 bc = cb_data->inet_diag_nla_bc; 1017 if (idiag_states & TCPF_SYN_RECV) 1018 idiag_states |= TCPF_NEW_SYN_RECV; 1019 s_i = cb->args[1]; 1020 s_num = num = cb->args[2]; 1021 1022 if (cb->args[0] == 0) { 1023 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport) 1024 goto skip_listen_ht; 1025 1026 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 1027 struct inet_listen_hashbucket *ilb; 1028 struct hlist_nulls_node *node; 1029 1030 num = 0; 1031 ilb = &hashinfo->listening_hash[i]; 1032 spin_lock(&ilb->lock); 1033 sk_nulls_for_each(sk, node, &ilb->nulls_head) { 1034 struct inet_sock *inet = inet_sk(sk); 1035 1036 if (!net_eq(sock_net(sk), net)) 1037 continue; 1038 1039 if (num < s_num) { 1040 num++; 1041 continue; 1042 } 1043 1044 if (r->sdiag_family != AF_UNSPEC && 1045 sk->sk_family != r->sdiag_family) 1046 goto next_listen; 1047 1048 if (r->id.idiag_sport != inet->inet_sport && 1049 r->id.idiag_sport) 1050 goto next_listen; 1051 1052 if (!inet_diag_bc_sk(bc, sk)) 1053 goto next_listen; 1054 1055 if (inet_sk_diag_fill(sk, inet_csk(sk), skb, 1056 cb, r, NLM_F_MULTI, 1057 net_admin) < 0) { 1058 spin_unlock(&ilb->lock); 1059 goto done; 1060 } 1061 1062 next_listen: 1063 ++num; 1064 } 1065 spin_unlock(&ilb->lock); 1066 1067 s_num = 0; 1068 } 1069 skip_listen_ht: 1070 cb->args[0] = 1; 1071 s_i = num = s_num = 0; 1072 } 1073 1074 if (!(idiag_states & ~TCPF_LISTEN)) 1075 goto out; 1076 1077 #define SKARR_SZ 16 1078 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 1079 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 1080 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 1081 struct hlist_nulls_node *node; 1082 struct sock *sk_arr[SKARR_SZ]; 1083 int num_arr[SKARR_SZ]; 1084 int idx, accum, res; 1085 1086 if (hlist_nulls_empty(&head->chain)) 1087 continue; 1088 1089 if (i > s_i) 1090 s_num = 0; 1091 1092 next_chunk: 1093 num = 0; 1094 accum = 0; 1095 spin_lock_bh(lock); 1096 sk_nulls_for_each(sk, node, &head->chain) { 1097 int state; 1098 1099 if (!net_eq(sock_net(sk), net)) 1100 continue; 1101 if (num < s_num) 1102 goto next_normal; 1103 state = (sk->sk_state == TCP_TIME_WAIT) ? 1104 inet_twsk(sk)->tw_substate : sk->sk_state; 1105 if (!(idiag_states & (1 << state))) 1106 goto next_normal; 1107 if (r->sdiag_family != AF_UNSPEC && 1108 sk->sk_family != r->sdiag_family) 1109 goto next_normal; 1110 if (r->id.idiag_sport != htons(sk->sk_num) && 1111 r->id.idiag_sport) 1112 goto next_normal; 1113 if (r->id.idiag_dport != sk->sk_dport && 1114 r->id.idiag_dport) 1115 goto next_normal; 1116 twsk_build_assert(); 1117 1118 if (!inet_diag_bc_sk(bc, sk)) 1119 goto next_normal; 1120 1121 if (!refcount_inc_not_zero(&sk->sk_refcnt)) 1122 goto next_normal; 1123 1124 num_arr[accum] = num; 1125 sk_arr[accum] = sk; 1126 if (++accum == SKARR_SZ) 1127 break; 1128 next_normal: 1129 ++num; 1130 } 1131 spin_unlock_bh(lock); 1132 res = 0; 1133 for (idx = 0; idx < accum; idx++) { 1134 if (res >= 0) { 1135 res = sk_diag_fill(sk_arr[idx], skb, cb, r, 1136 NLM_F_MULTI, net_admin); 1137 if (res < 0) 1138 num = num_arr[idx]; 1139 } 1140 sock_gen_put(sk_arr[idx]); 1141 } 1142 if (res < 0) 1143 break; 1144 cond_resched(); 1145 if (accum == SKARR_SZ) { 1146 s_num = num + 1; 1147 goto next_chunk; 1148 } 1149 } 1150 1151 done: 1152 cb->args[1] = i; 1153 cb->args[2] = num; 1154 out: 1155 ; 1156 } 1157 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk); 1158 1159 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 1160 const struct inet_diag_req_v2 *r) 1161 { 1162 struct inet_diag_dump_data *cb_data = cb->data; 1163 const struct inet_diag_handler *handler; 1164 u32 prev_min_dump_alloc; 1165 int protocol, err = 0; 1166 1167 protocol = inet_diag_get_protocol(r, cb_data); 1168 1169 again: 1170 prev_min_dump_alloc = cb->min_dump_alloc; 1171 handler = inet_diag_lock_handler(protocol); 1172 if (!IS_ERR(handler)) 1173 handler->dump(skb, cb, r); 1174 else 1175 err = PTR_ERR(handler); 1176 inet_diag_unlock_handler(handler); 1177 1178 /* The skb is not large enough to fit one sk info and 1179 * inet_sk_diag_fill() has requested for a larger skb. 1180 */ 1181 if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) { 1182 err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL); 1183 if (!err) 1184 goto again; 1185 } 1186 1187 return err ? : skb->len; 1188 } 1189 1190 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 1191 { 1192 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh)); 1193 } 1194 1195 static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen) 1196 { 1197 const struct nlmsghdr *nlh = cb->nlh; 1198 struct inet_diag_dump_data *cb_data; 1199 struct sk_buff *skb = cb->skb; 1200 struct nlattr *nla; 1201 int err; 1202 1203 cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL); 1204 if (!cb_data) 1205 return -ENOMEM; 1206 1207 err = inet_diag_parse_attrs(nlh, hdrlen, cb_data->req_nlas); 1208 if (err) { 1209 kfree(cb_data); 1210 return err; 1211 } 1212 nla = cb_data->inet_diag_nla_bc; 1213 if (nla) { 1214 err = inet_diag_bc_audit(nla, skb); 1215 if (err) { 1216 kfree(cb_data); 1217 return err; 1218 } 1219 } 1220 1221 nla = cb_data->inet_diag_nla_bpf_stgs; 1222 if (nla) { 1223 struct bpf_sk_storage_diag *bpf_stg_diag; 1224 1225 bpf_stg_diag = bpf_sk_storage_diag_alloc(nla); 1226 if (IS_ERR(bpf_stg_diag)) { 1227 kfree(cb_data); 1228 return PTR_ERR(bpf_stg_diag); 1229 } 1230 cb_data->bpf_stg_diag = bpf_stg_diag; 1231 } 1232 1233 cb->data = cb_data; 1234 return 0; 1235 } 1236 1237 static int inet_diag_dump_start(struct netlink_callback *cb) 1238 { 1239 return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2)); 1240 } 1241 1242 static int inet_diag_dump_start_compat(struct netlink_callback *cb) 1243 { 1244 return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req)); 1245 } 1246 1247 static int inet_diag_dump_done(struct netlink_callback *cb) 1248 { 1249 struct inet_diag_dump_data *cb_data = cb->data; 1250 1251 bpf_sk_storage_diag_free(cb_data->bpf_stg_diag); 1252 kfree(cb->data); 1253 1254 return 0; 1255 } 1256 1257 static int inet_diag_type2proto(int type) 1258 { 1259 switch (type) { 1260 case TCPDIAG_GETSOCK: 1261 return IPPROTO_TCP; 1262 case DCCPDIAG_GETSOCK: 1263 return IPPROTO_DCCP; 1264 default: 1265 return 0; 1266 } 1267 } 1268 1269 static int inet_diag_dump_compat(struct sk_buff *skb, 1270 struct netlink_callback *cb) 1271 { 1272 struct inet_diag_req *rc = nlmsg_data(cb->nlh); 1273 struct inet_diag_req_v2 req; 1274 1275 req.sdiag_family = AF_UNSPEC; /* compatibility */ 1276 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 1277 req.idiag_ext = rc->idiag_ext; 1278 req.idiag_states = rc->idiag_states; 1279 req.id = rc->id; 1280 1281 return __inet_diag_dump(skb, cb, &req); 1282 } 1283 1284 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 1285 const struct nlmsghdr *nlh) 1286 { 1287 struct inet_diag_req *rc = nlmsg_data(nlh); 1288 struct inet_diag_req_v2 req; 1289 1290 req.sdiag_family = rc->idiag_family; 1291 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 1292 req.idiag_ext = rc->idiag_ext; 1293 req.idiag_states = rc->idiag_states; 1294 req.id = rc->id; 1295 1296 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, 1297 sizeof(struct inet_diag_req), &req); 1298 } 1299 1300 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 1301 { 1302 int hdrlen = sizeof(struct inet_diag_req); 1303 struct net *net = sock_net(skb->sk); 1304 1305 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 1306 nlmsg_len(nlh) < hdrlen) 1307 return -EINVAL; 1308 1309 if (nlh->nlmsg_flags & NLM_F_DUMP) { 1310 struct netlink_dump_control c = { 1311 .start = inet_diag_dump_start_compat, 1312 .done = inet_diag_dump_done, 1313 .dump = inet_diag_dump_compat, 1314 }; 1315 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c); 1316 } 1317 1318 return inet_diag_get_exact_compat(skb, nlh); 1319 } 1320 1321 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h) 1322 { 1323 int hdrlen = sizeof(struct inet_diag_req_v2); 1324 struct net *net = sock_net(skb->sk); 1325 1326 if (nlmsg_len(h) < hdrlen) 1327 return -EINVAL; 1328 1329 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY && 1330 h->nlmsg_flags & NLM_F_DUMP) { 1331 struct netlink_dump_control c = { 1332 .start = inet_diag_dump_start, 1333 .done = inet_diag_dump_done, 1334 .dump = inet_diag_dump, 1335 }; 1336 return netlink_dump_start(net->diag_nlsk, skb, h, &c); 1337 } 1338 1339 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, hdrlen, 1340 nlmsg_data(h)); 1341 } 1342 1343 static 1344 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk) 1345 { 1346 const struct inet_diag_handler *handler; 1347 struct nlmsghdr *nlh; 1348 struct nlattr *attr; 1349 struct inet_diag_msg *r; 1350 void *info = NULL; 1351 int err = 0; 1352 1353 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0); 1354 if (!nlh) 1355 return -ENOMEM; 1356 1357 r = nlmsg_data(nlh); 1358 memset(r, 0, sizeof(*r)); 1359 inet_diag_msg_common_fill(r, sk); 1360 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM) 1361 r->id.idiag_sport = inet_sk(sk)->inet_sport; 1362 r->idiag_state = sk->sk_state; 1363 1364 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) { 1365 nlmsg_cancel(skb, nlh); 1366 return err; 1367 } 1368 1369 handler = inet_diag_lock_handler(sk->sk_protocol); 1370 if (IS_ERR(handler)) { 1371 inet_diag_unlock_handler(handler); 1372 nlmsg_cancel(skb, nlh); 1373 return PTR_ERR(handler); 1374 } 1375 1376 attr = handler->idiag_info_size 1377 ? nla_reserve_64bit(skb, INET_DIAG_INFO, 1378 handler->idiag_info_size, 1379 INET_DIAG_PAD) 1380 : NULL; 1381 if (attr) 1382 info = nla_data(attr); 1383 1384 handler->idiag_get_info(sk, r, info); 1385 inet_diag_unlock_handler(handler); 1386 1387 nlmsg_end(skb, nlh); 1388 return 0; 1389 } 1390 1391 static const struct sock_diag_handler inet_diag_handler = { 1392 .family = AF_INET, 1393 .dump = inet_diag_handler_cmd, 1394 .get_info = inet_diag_handler_get_info, 1395 .destroy = inet_diag_handler_cmd, 1396 }; 1397 1398 static const struct sock_diag_handler inet6_diag_handler = { 1399 .family = AF_INET6, 1400 .dump = inet_diag_handler_cmd, 1401 .get_info = inet_diag_handler_get_info, 1402 .destroy = inet_diag_handler_cmd, 1403 }; 1404 1405 int inet_diag_register(const struct inet_diag_handler *h) 1406 { 1407 const __u16 type = h->idiag_type; 1408 int err = -EINVAL; 1409 1410 if (type >= IPPROTO_MAX) 1411 goto out; 1412 1413 mutex_lock(&inet_diag_table_mutex); 1414 err = -EEXIST; 1415 if (!inet_diag_table[type]) { 1416 inet_diag_table[type] = h; 1417 err = 0; 1418 } 1419 mutex_unlock(&inet_diag_table_mutex); 1420 out: 1421 return err; 1422 } 1423 EXPORT_SYMBOL_GPL(inet_diag_register); 1424 1425 void inet_diag_unregister(const struct inet_diag_handler *h) 1426 { 1427 const __u16 type = h->idiag_type; 1428 1429 if (type >= IPPROTO_MAX) 1430 return; 1431 1432 mutex_lock(&inet_diag_table_mutex); 1433 inet_diag_table[type] = NULL; 1434 mutex_unlock(&inet_diag_table_mutex); 1435 } 1436 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1437 1438 static int __init inet_diag_init(void) 1439 { 1440 const int inet_diag_table_size = (IPPROTO_MAX * 1441 sizeof(struct inet_diag_handler *)); 1442 int err = -ENOMEM; 1443 1444 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1445 if (!inet_diag_table) 1446 goto out; 1447 1448 err = sock_diag_register(&inet_diag_handler); 1449 if (err) 1450 goto out_free_nl; 1451 1452 err = sock_diag_register(&inet6_diag_handler); 1453 if (err) 1454 goto out_free_inet; 1455 1456 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1457 out: 1458 return err; 1459 1460 out_free_inet: 1461 sock_diag_unregister(&inet_diag_handler); 1462 out_free_nl: 1463 kfree(inet_diag_table); 1464 goto out; 1465 } 1466 1467 static void __exit inet_diag_exit(void) 1468 { 1469 sock_diag_unregister(&inet6_diag_handler); 1470 sock_diag_unregister(&inet_diag_handler); 1471 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1472 kfree(inet_diag_table); 1473 } 1474 1475 module_init(inet_diag_init); 1476 module_exit(inet_diag_exit); 1477 MODULE_LICENSE("GPL"); 1478 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */); 1479 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */); 1480