1 /* SCTP kernel implementation 2 * (C) Copyright Red Hat Inc. 2017 3 * 4 * This file is part of the SCTP kernel implementation 5 * 6 * These functions implement sctp diag support. 7 * 8 * This SCTP implementation is free software; 9 * you can redistribute it and/or modify it under the terms of 10 * the GNU General Public License as published by 11 * the Free Software Foundation; either version 2, or (at your option) 12 * any later version. 13 * 14 * This SCTP implementation is distributed in the hope that it 15 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 16 * ************************ 17 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 18 * See the GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with GNU CC; see the file COPYING. If not, see 22 * <http://www.gnu.org/licenses/>. 23 * 24 * Please send any bug reports or fixes you make to the 25 * email addresched(es): 26 * lksctp developers <linux-sctp@vger.kernel.org> 27 * 28 * Written or modified by: 29 * Xin Long <lucien.xin@gmail.com> 30 */ 31 32 #include <linux/module.h> 33 #include <linux/inet_diag.h> 34 #include <linux/sock_diag.h> 35 #include <net/sctp/sctp.h> 36 37 static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, 38 void *info); 39 40 /* define some functions to make asoc/ep fill look clean */ 41 static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r, 42 struct sock *sk, 43 struct sctp_association *asoc) 44 { 45 union sctp_addr laddr, paddr; 46 struct dst_entry *dst; 47 struct timer_list *t3_rtx = &asoc->peer.primary_path->T3_rtx_timer; 48 49 laddr = list_entry(asoc->base.bind_addr.address_list.next, 50 struct sctp_sockaddr_entry, list)->a; 51 paddr = asoc->peer.primary_path->ipaddr; 52 dst = asoc->peer.primary_path->dst; 53 54 r->idiag_family = sk->sk_family; 55 r->id.idiag_sport = htons(asoc->base.bind_addr.port); 56 r->id.idiag_dport = htons(asoc->peer.port); 57 r->id.idiag_if = dst ? dst->dev->ifindex : 0; 58 sock_diag_save_cookie(sk, r->id.idiag_cookie); 59 60 #if IS_ENABLED(CONFIG_IPV6) 61 if (sk->sk_family == AF_INET6) { 62 *(struct in6_addr *)r->id.idiag_src = laddr.v6.sin6_addr; 63 *(struct in6_addr *)r->id.idiag_dst = paddr.v6.sin6_addr; 64 } else 65 #endif 66 { 67 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src)); 68 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst)); 69 70 r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr; 71 r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr; 72 } 73 74 r->idiag_state = asoc->state; 75 if (timer_pending(t3_rtx)) { 76 r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX; 77 r->idiag_retrans = asoc->rtx_data_chunks; 78 r->idiag_expires = jiffies_to_msecs(t3_rtx->expires - jiffies); 79 } else { 80 r->idiag_timer = 0; 81 r->idiag_retrans = 0; 82 r->idiag_expires = 0; 83 } 84 } 85 86 static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb, 87 struct list_head *address_list) 88 { 89 struct sctp_sockaddr_entry *laddr; 90 int addrlen = sizeof(struct sockaddr_storage); 91 int addrcnt = 0; 92 struct nlattr *attr; 93 void *info = NULL; 94 95 list_for_each_entry_rcu(laddr, address_list, list) 96 addrcnt++; 97 98 attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt); 99 if (!attr) 100 return -EMSGSIZE; 101 102 info = nla_data(attr); 103 list_for_each_entry_rcu(laddr, address_list, list) { 104 memcpy(info, &laddr->a, sizeof(laddr->a)); 105 memset(info + sizeof(laddr->a), 0, addrlen - sizeof(laddr->a)); 106 info += addrlen; 107 } 108 109 return 0; 110 } 111 112 static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb, 113 struct sctp_association *asoc) 114 { 115 int addrlen = sizeof(struct sockaddr_storage); 116 struct sctp_transport *from; 117 struct nlattr *attr; 118 void *info = NULL; 119 120 attr = nla_reserve(skb, INET_DIAG_PEERS, 121 addrlen * asoc->peer.transport_count); 122 if (!attr) 123 return -EMSGSIZE; 124 125 info = nla_data(attr); 126 list_for_each_entry(from, &asoc->peer.transport_addr_list, 127 transports) { 128 memcpy(info, &from->ipaddr, sizeof(from->ipaddr)); 129 memset(info + sizeof(from->ipaddr), 0, 130 addrlen - sizeof(from->ipaddr)); 131 info += addrlen; 132 } 133 134 return 0; 135 } 136 137 /* sctp asoc/ep fill*/ 138 static int inet_sctp_diag_fill(struct sock *sk, struct sctp_association *asoc, 139 struct sk_buff *skb, 140 const struct inet_diag_req_v2 *req, 141 struct user_namespace *user_ns, 142 int portid, u32 seq, u16 nlmsg_flags, 143 const struct nlmsghdr *unlh, 144 bool net_admin) 145 { 146 struct sctp_endpoint *ep = sctp_sk(sk)->ep; 147 struct list_head *addr_list; 148 struct inet_diag_msg *r; 149 struct nlmsghdr *nlh; 150 int ext = req->idiag_ext; 151 struct sctp_infox infox; 152 void *info = NULL; 153 154 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 155 nlmsg_flags); 156 if (!nlh) 157 return -EMSGSIZE; 158 159 r = nlmsg_data(nlh); 160 BUG_ON(!sk_fullsock(sk)); 161 162 if (asoc) { 163 inet_diag_msg_sctpasoc_fill(r, sk, asoc); 164 } else { 165 inet_diag_msg_common_fill(r, sk); 166 r->idiag_state = sk->sk_state; 167 r->idiag_timer = 0; 168 r->idiag_retrans = 0; 169 } 170 171 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin)) 172 goto errout; 173 174 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) { 175 u32 mem[SK_MEMINFO_VARS]; 176 int amt; 177 178 if (asoc && asoc->ep->sndbuf_policy) 179 amt = asoc->sndbuf_used; 180 else 181 amt = sk_wmem_alloc_get(sk); 182 mem[SK_MEMINFO_WMEM_ALLOC] = amt; 183 if (asoc && asoc->ep->rcvbuf_policy) 184 amt = atomic_read(&asoc->rmem_alloc); 185 else 186 amt = sk_rmem_alloc_get(sk); 187 mem[SK_MEMINFO_RMEM_ALLOC] = amt; 188 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf; 189 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf; 190 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc; 191 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued; 192 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc); 193 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len; 194 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops); 195 196 if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0) 197 goto errout; 198 } 199 200 if (ext & (1 << (INET_DIAG_INFO - 1))) { 201 struct nlattr *attr; 202 203 attr = nla_reserve_64bit(skb, INET_DIAG_INFO, 204 sizeof(struct sctp_info), 205 INET_DIAG_PAD); 206 if (!attr) 207 goto errout; 208 209 info = nla_data(attr); 210 } 211 infox.sctpinfo = (struct sctp_info *)info; 212 infox.asoc = asoc; 213 sctp_diag_get_info(sk, r, &infox); 214 215 addr_list = asoc ? &asoc->base.bind_addr.address_list 216 : &ep->base.bind_addr.address_list; 217 if (inet_diag_msg_sctpladdrs_fill(skb, addr_list)) 218 goto errout; 219 220 if (asoc && (ext & (1 << (INET_DIAG_CONG - 1)))) 221 if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0) 222 goto errout; 223 224 if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc)) 225 goto errout; 226 227 nlmsg_end(skb, nlh); 228 return 0; 229 230 errout: 231 nlmsg_cancel(skb, nlh); 232 return -EMSGSIZE; 233 } 234 235 /* callback and param */ 236 struct sctp_comm_param { 237 struct sk_buff *skb; 238 struct netlink_callback *cb; 239 const struct inet_diag_req_v2 *r; 240 const struct nlmsghdr *nlh; 241 bool net_admin; 242 }; 243 244 static size_t inet_assoc_attr_size(struct sctp_association *asoc) 245 { 246 int addrlen = sizeof(struct sockaddr_storage); 247 int addrcnt = 0; 248 struct sctp_sockaddr_entry *laddr; 249 250 list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list, 251 list) 252 addrcnt++; 253 254 return nla_total_size(sizeof(struct sctp_info)) 255 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */ 256 + nla_total_size(1) /* INET_DIAG_TOS */ 257 + nla_total_size(1) /* INET_DIAG_TCLASS */ 258 + nla_total_size(4) /* INET_DIAG_MARK */ 259 + nla_total_size(addrlen * asoc->peer.transport_count) 260 + nla_total_size(addrlen * addrcnt) 261 + nla_total_size(sizeof(struct inet_diag_meminfo)) 262 + nla_total_size(sizeof(struct inet_diag_msg)) 263 + 64; 264 } 265 266 static int sctp_tsp_dump_one(struct sctp_transport *tsp, void *p) 267 { 268 struct sctp_association *assoc = tsp->asoc; 269 struct sock *sk = tsp->asoc->base.sk; 270 struct sctp_comm_param *commp = p; 271 struct sk_buff *in_skb = commp->skb; 272 const struct inet_diag_req_v2 *req = commp->r; 273 const struct nlmsghdr *nlh = commp->nlh; 274 struct net *net = sock_net(in_skb->sk); 275 struct sk_buff *rep; 276 int err; 277 278 err = sock_diag_check_cookie(sk, req->id.idiag_cookie); 279 if (err) 280 goto out; 281 282 err = -ENOMEM; 283 rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL); 284 if (!rep) 285 goto out; 286 287 lock_sock(sk); 288 if (sk != assoc->base.sk) { 289 release_sock(sk); 290 sk = assoc->base.sk; 291 lock_sock(sk); 292 } 293 err = inet_sctp_diag_fill(sk, assoc, rep, req, 294 sk_user_ns(NETLINK_CB(in_skb).sk), 295 NETLINK_CB(in_skb).portid, 296 nlh->nlmsg_seq, 0, nlh, 297 commp->net_admin); 298 release_sock(sk); 299 if (err < 0) { 300 WARN_ON(err == -EMSGSIZE); 301 kfree_skb(rep); 302 goto out; 303 } 304 305 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid, 306 MSG_DONTWAIT); 307 if (err > 0) 308 err = 0; 309 out: 310 return err; 311 } 312 313 static int sctp_sock_dump(struct sctp_transport *tsp, void *p) 314 { 315 struct sctp_endpoint *ep = tsp->asoc->ep; 316 struct sctp_comm_param *commp = p; 317 struct sock *sk = ep->base.sk; 318 struct sk_buff *skb = commp->skb; 319 struct netlink_callback *cb = commp->cb; 320 const struct inet_diag_req_v2 *r = commp->r; 321 struct sctp_association *assoc; 322 int err = 0; 323 324 lock_sock(sk); 325 list_for_each_entry(assoc, &ep->asocs, asocs) { 326 if (cb->args[4] < cb->args[1]) 327 goto next; 328 329 if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) && 330 r->id.idiag_sport) 331 goto next; 332 if (r->id.idiag_dport != htons(assoc->peer.port) && 333 r->id.idiag_dport) 334 goto next; 335 336 if (!cb->args[3] && 337 inet_sctp_diag_fill(sk, NULL, skb, r, 338 sk_user_ns(NETLINK_CB(cb->skb).sk), 339 NETLINK_CB(cb->skb).portid, 340 cb->nlh->nlmsg_seq, 341 NLM_F_MULTI, cb->nlh, 342 commp->net_admin) < 0) { 343 err = 1; 344 goto release; 345 } 346 cb->args[3] = 1; 347 348 if (inet_sctp_diag_fill(sk, assoc, skb, r, 349 sk_user_ns(NETLINK_CB(cb->skb).sk), 350 NETLINK_CB(cb->skb).portid, 351 cb->nlh->nlmsg_seq, 0, cb->nlh, 352 commp->net_admin) < 0) { 353 err = 1; 354 goto release; 355 } 356 next: 357 cb->args[4]++; 358 } 359 cb->args[1] = 0; 360 cb->args[3] = 0; 361 cb->args[4] = 0; 362 release: 363 release_sock(sk); 364 return err; 365 } 366 367 static int sctp_sock_filter(struct sctp_transport *tsp, void *p) 368 { 369 struct sctp_endpoint *ep = tsp->asoc->ep; 370 struct sctp_comm_param *commp = p; 371 struct sock *sk = ep->base.sk; 372 const struct inet_diag_req_v2 *r = commp->r; 373 struct sctp_association *assoc = 374 list_entry(ep->asocs.next, struct sctp_association, asocs); 375 376 /* find the ep only once through the transports by this condition */ 377 if (tsp->asoc != assoc) 378 return 0; 379 380 if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family) 381 return 0; 382 383 return 1; 384 } 385 386 static int sctp_ep_dump(struct sctp_endpoint *ep, void *p) 387 { 388 struct sctp_comm_param *commp = p; 389 struct sock *sk = ep->base.sk; 390 struct sk_buff *skb = commp->skb; 391 struct netlink_callback *cb = commp->cb; 392 const struct inet_diag_req_v2 *r = commp->r; 393 struct net *net = sock_net(skb->sk); 394 struct inet_sock *inet = inet_sk(sk); 395 int err = 0; 396 397 if (!net_eq(sock_net(sk), net)) 398 goto out; 399 400 if (cb->args[4] < cb->args[1]) 401 goto next; 402 403 if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs)) 404 goto next; 405 406 if (r->sdiag_family != AF_UNSPEC && 407 sk->sk_family != r->sdiag_family) 408 goto next; 409 410 if (r->id.idiag_sport != inet->inet_sport && 411 r->id.idiag_sport) 412 goto next; 413 414 if (r->id.idiag_dport != inet->inet_dport && 415 r->id.idiag_dport) 416 goto next; 417 418 if (inet_sctp_diag_fill(sk, NULL, skb, r, 419 sk_user_ns(NETLINK_CB(cb->skb).sk), 420 NETLINK_CB(cb->skb).portid, 421 cb->nlh->nlmsg_seq, NLM_F_MULTI, 422 cb->nlh, commp->net_admin) < 0) { 423 err = 2; 424 goto out; 425 } 426 next: 427 cb->args[4]++; 428 out: 429 return err; 430 } 431 432 /* define the functions for sctp_diag_handler*/ 433 static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, 434 void *info) 435 { 436 struct sctp_infox *infox = (struct sctp_infox *)info; 437 438 if (infox->asoc) { 439 r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc); 440 r->idiag_wqueue = infox->asoc->sndbuf_used; 441 } else { 442 r->idiag_rqueue = sk->sk_ack_backlog; 443 r->idiag_wqueue = sk->sk_max_ack_backlog; 444 } 445 if (infox->sctpinfo) 446 sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo); 447 } 448 449 static int sctp_diag_dump_one(struct sk_buff *in_skb, 450 const struct nlmsghdr *nlh, 451 const struct inet_diag_req_v2 *req) 452 { 453 struct net *net = sock_net(in_skb->sk); 454 union sctp_addr laddr, paddr; 455 struct sctp_comm_param commp = { 456 .skb = in_skb, 457 .r = req, 458 .nlh = nlh, 459 .net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN), 460 }; 461 462 if (req->sdiag_family == AF_INET) { 463 laddr.v4.sin_port = req->id.idiag_sport; 464 laddr.v4.sin_addr.s_addr = req->id.idiag_src[0]; 465 laddr.v4.sin_family = AF_INET; 466 467 paddr.v4.sin_port = req->id.idiag_dport; 468 paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0]; 469 paddr.v4.sin_family = AF_INET; 470 } else { 471 laddr.v6.sin6_port = req->id.idiag_sport; 472 memcpy(&laddr.v6.sin6_addr, req->id.idiag_src, 473 sizeof(laddr.v6.sin6_addr)); 474 laddr.v6.sin6_family = AF_INET6; 475 476 paddr.v6.sin6_port = req->id.idiag_dport; 477 memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst, 478 sizeof(paddr.v6.sin6_addr)); 479 paddr.v6.sin6_family = AF_INET6; 480 } 481 482 return sctp_transport_lookup_process(sctp_tsp_dump_one, 483 net, &laddr, &paddr, &commp); 484 } 485 486 static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 487 const struct inet_diag_req_v2 *r, struct nlattr *bc) 488 { 489 u32 idiag_states = r->idiag_states; 490 struct net *net = sock_net(skb->sk); 491 struct sctp_comm_param commp = { 492 .skb = skb, 493 .cb = cb, 494 .r = r, 495 .net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN), 496 }; 497 int pos = cb->args[2]; 498 499 /* eps hashtable dumps 500 * args: 501 * 0 : if it will traversal listen sock 502 * 1 : to record the sock pos of this time's traversal 503 * 4 : to work as a temporary variable to traversal list 504 */ 505 if (cb->args[0] == 0) { 506 if (!(idiag_states & TCPF_LISTEN)) 507 goto skip; 508 if (sctp_for_each_endpoint(sctp_ep_dump, &commp)) 509 goto done; 510 skip: 511 cb->args[0] = 1; 512 cb->args[1] = 0; 513 cb->args[4] = 0; 514 } 515 516 /* asocs by transport hashtable dump 517 * args: 518 * 1 : to record the assoc pos of this time's traversal 519 * 2 : to record the transport pos of this time's traversal 520 * 3 : to mark if we have dumped the ep info of the current asoc 521 * 4 : to work as a temporary variable to traversal list 522 * 5 : to save the sk we get from travelsing the tsp list. 523 */ 524 if (!(idiag_states & ~(TCPF_LISTEN | TCPF_CLOSE))) 525 goto done; 526 527 sctp_for_each_transport(sctp_sock_filter, sctp_sock_dump, 528 net, &pos, &commp); 529 cb->args[2] = pos; 530 531 done: 532 cb->args[1] = cb->args[4]; 533 cb->args[4] = 0; 534 } 535 536 static const struct inet_diag_handler sctp_diag_handler = { 537 .dump = sctp_diag_dump, 538 .dump_one = sctp_diag_dump_one, 539 .idiag_get_info = sctp_diag_get_info, 540 .idiag_type = IPPROTO_SCTP, 541 .idiag_info_size = sizeof(struct sctp_info), 542 }; 543 544 static int __init sctp_diag_init(void) 545 { 546 return inet_diag_register(&sctp_diag_handler); 547 } 548 549 static void __exit sctp_diag_exit(void) 550 { 551 inet_diag_unregister(&sctp_diag_handler); 552 } 553 554 module_init(sctp_diag_init); 555 module_exit(sctp_diag_exit); 556 MODULE_LICENSE("GPL"); 557 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132); 558