1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * IUCV protocol stack for Linux on zSeries 4 * 5 * Copyright IBM Corp. 2006, 2009 6 * 7 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com> 8 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com> 9 * PM functions: 10 * Ursula Braun <ursula.braun@de.ibm.com> 11 */ 12 13 #define pr_fmt(fmt) "af_iucv: " fmt 14 15 #include <linux/filter.h> 16 #include <linux/module.h> 17 #include <linux/netdevice.h> 18 #include <linux/types.h> 19 #include <linux/limits.h> 20 #include <linux/list.h> 21 #include <linux/errno.h> 22 #include <linux/kernel.h> 23 #include <linux/sched/signal.h> 24 #include <linux/slab.h> 25 #include <linux/skbuff.h> 26 #include <linux/init.h> 27 #include <linux/poll.h> 28 #include <linux/security.h> 29 #include <net/sock.h> 30 #include <asm/machine.h> 31 #include <asm/ebcdic.h> 32 #include <asm/cpcmd.h> 33 #include <linux/kmod.h> 34 35 #include <net/iucv/af_iucv.h> 36 37 #define VERSION "1.2" 38 39 static char iucv_userid[80]; 40 41 static struct proto iucv_proto = { 42 .name = "AF_IUCV", 43 .owner = THIS_MODULE, 44 .obj_size = sizeof(struct iucv_sock), 45 }; 46 47 static struct iucv_interface *pr_iucv; 48 static struct iucv_handler af_iucv_handler; 49 50 /* special AF_IUCV IPRM messages */ 51 static const u8 iprm_shutdown[8] = 52 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; 53 54 #define TRGCLS_SIZE sizeof_field(struct iucv_message, class) 55 56 #define __iucv_sock_wait(sk, condition, timeo, ret) \ 57 do { \ 58 DEFINE_WAIT(__wait); \ 59 long __timeo = timeo; \ 60 ret = 0; \ 61 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ 62 while (!(condition)) { \ 63 if (!__timeo) { \ 64 ret = -EAGAIN; \ 65 break; \ 66 } \ 67 if (signal_pending(current)) { \ 68 ret = sock_intr_errno(__timeo); \ 69 break; \ 70 } \ 71 release_sock(sk); \ 72 __timeo = schedule_timeout(__timeo); \ 73 lock_sock(sk); \ 74 ret = sock_error(sk); \ 75 if (ret) \ 76 break; \ 77 } \ 78 finish_wait(sk_sleep(sk), &__wait); \ 79 } while (0) 80 81 #define iucv_sock_wait(sk, condition, timeo) \ 82 ({ \ 83 int __ret = 0; \ 84 if (!(condition)) \ 85 __iucv_sock_wait(sk, condition, timeo, __ret); \ 86 __ret; \ 87 }) 88 89 static struct sock *iucv_accept_dequeue(struct sock *parent, 90 struct socket *newsock); 91 static void iucv_sock_kill(struct sock *sk); 92 static void iucv_sock_close(struct sock *sk); 93 94 static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify); 95 96 static struct iucv_sock_list iucv_sk_list = { 97 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), 98 .autobind_name = ATOMIC_INIT(0) 99 }; 100 101 static inline void high_nmcpy(unsigned char *dst, char *src) 102 { 103 memcpy(dst, src, 8); 104 } 105 106 static inline void low_nmcpy(unsigned char *dst, char *src) 107 { 108 memcpy(&dst[8], src, 8); 109 } 110 111 /** 112 * iucv_msg_length() - Returns the length of an iucv message. 113 * @msg: Pointer to struct iucv_message, MUST NOT be NULL 114 * 115 * The function returns the length of the specified iucv message @msg of data 116 * stored in a buffer and of data stored in the parameter list (PRMDATA). 117 * 118 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket 119 * data: 120 * PRMDATA[0..6] socket data (max 7 bytes); 121 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) 122 * 123 * The socket data length is computed by subtracting the socket data length 124 * value from 0xFF. 125 * If the socket data len is greater 7, then PRMDATA can be used for special 126 * notifications (see iucv_sock_shutdown); and further, 127 * if the socket data len is > 7, the function returns 8. 128 * 129 * Use this function to allocate socket buffers to store iucv message data. 130 * 131 * Returns: Length of the IUCV message. 132 */ 133 static inline size_t iucv_msg_length(struct iucv_message *msg) 134 { 135 size_t datalen; 136 137 if (msg->flags & IUCV_IPRMDATA) { 138 datalen = 0xff - msg->rmmsg[7]; 139 return (datalen < 8) ? datalen : 8; 140 } 141 return msg->length; 142 } 143 144 /** 145 * iucv_sock_in_state() - check for specific states 146 * @sk: sock structure 147 * @state: first iucv sk state 148 * @state2: second iucv sk state 149 * 150 * Returns: true if the socket is either in the first or second state. 151 */ 152 static int iucv_sock_in_state(struct sock *sk, int state, int state2) 153 { 154 return (sk->sk_state == state || sk->sk_state == state2); 155 } 156 157 /** 158 * iucv_below_msglim() - function to check if messages can be sent 159 * @sk: sock structure 160 * 161 * Returns: true, if either the socket is not connected (no iucv path for 162 * checking the message limit) or if the send queue length is lower 163 * than the message limit. 164 */ 165 static inline int iucv_below_msglim(struct sock *sk) 166 { 167 struct iucv_sock *iucv = iucv_sk(sk); 168 169 if (sk->sk_state != IUCV_CONNECTED) 170 return 1; 171 if (iucv->transport == AF_IUCV_TRANS_IUCV) 172 return (atomic_read(&iucv->skbs_in_xmit) < iucv->path->msglim); 173 else 174 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && 175 (atomic_read(&iucv->pendings) <= 0)); 176 } 177 178 /* 179 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit 180 */ 181 static void iucv_sock_wake_msglim(struct sock *sk) 182 { 183 struct socket_wq *wq; 184 185 rcu_read_lock(); 186 wq = rcu_dereference(sk->sk_wq); 187 if (skwq_has_sleeper(wq)) 188 wake_up_interruptible_all(&wq->wait); 189 sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT); 190 rcu_read_unlock(); 191 } 192 193 /* 194 * afiucv_hs_send() - send a message through HiperSockets transport 195 */ 196 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 197 struct sk_buff *skb, u8 flags) 198 { 199 struct iucv_sock *iucv = iucv_sk(sock); 200 struct af_iucv_trans_hdr *phs_hdr; 201 int err, confirm_recv = 0; 202 203 phs_hdr = skb_push(skb, sizeof(*phs_hdr)); 204 memset(phs_hdr, 0, sizeof(*phs_hdr)); 205 skb_reset_network_header(skb); 206 207 phs_hdr->magic = ETH_P_AF_IUCV; 208 phs_hdr->version = 1; 209 phs_hdr->flags = flags; 210 if (flags == AF_IUCV_FLAG_SYN) 211 phs_hdr->window = iucv->msglimit; 212 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { 213 confirm_recv = atomic_read(&iucv->msg_recv); 214 phs_hdr->window = confirm_recv; 215 if (confirm_recv) 216 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; 217 } 218 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); 219 memcpy(phs_hdr->destAppName, iucv->dst_name, 8); 220 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); 221 memcpy(phs_hdr->srcAppName, iucv->src_name, 8); 222 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); 223 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); 224 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); 225 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); 226 if (imsg) 227 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); 228 229 skb->dev = iucv->hs_dev; 230 if (!skb->dev) { 231 err = -ENODEV; 232 goto err_free; 233 } 234 235 dev_hard_header(skb, skb->dev, ETH_P_AF_IUCV, NULL, NULL, skb->len); 236 237 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) { 238 err = -ENETDOWN; 239 goto err_free; 240 } 241 if (skb->len > skb->dev->mtu) { 242 if (sock->sk_type == SOCK_SEQPACKET) { 243 err = -EMSGSIZE; 244 goto err_free; 245 } 246 err = pskb_trim(skb, skb->dev->mtu); 247 if (err) 248 goto err_free; 249 } 250 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV); 251 252 atomic_inc(&iucv->skbs_in_xmit); 253 err = dev_queue_xmit(skb); 254 if (net_xmit_eval(err)) { 255 atomic_dec(&iucv->skbs_in_xmit); 256 } else { 257 atomic_sub(confirm_recv, &iucv->msg_recv); 258 WARN_ON(atomic_read(&iucv->msg_recv) < 0); 259 } 260 return net_xmit_eval(err); 261 262 err_free: 263 kfree_skb(skb); 264 return err; 265 } 266 267 static struct sock *__iucv_get_sock_by_name(char *nm) 268 { 269 struct sock *sk; 270 271 sk_for_each(sk, &iucv_sk_list.head) 272 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) 273 return sk; 274 275 return NULL; 276 } 277 278 static void iucv_sock_destruct(struct sock *sk) 279 { 280 skb_queue_purge(&sk->sk_receive_queue); 281 skb_queue_purge(&sk->sk_error_queue); 282 283 if (!sock_flag(sk, SOCK_DEAD)) { 284 pr_err("Attempt to release alive iucv socket %p\n", sk); 285 return; 286 } 287 288 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 289 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 290 WARN_ON(sk->sk_wmem_queued); 291 WARN_ON(sk->sk_forward_alloc); 292 } 293 294 /* Cleanup Listen */ 295 static void iucv_sock_cleanup_listen(struct sock *parent) 296 { 297 struct sock *sk; 298 299 /* Close non-accepted connections */ 300 while ((sk = iucv_accept_dequeue(parent, NULL))) { 301 iucv_sock_close(sk); 302 iucv_sock_kill(sk); 303 } 304 305 parent->sk_state = IUCV_CLOSED; 306 } 307 308 static void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) 309 { 310 write_lock_bh(&l->lock); 311 sk_add_node(sk, &l->head); 312 write_unlock_bh(&l->lock); 313 } 314 315 static void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) 316 { 317 write_lock_bh(&l->lock); 318 sk_del_node_init(sk); 319 write_unlock_bh(&l->lock); 320 } 321 322 /* Kill socket (only if zapped and orphaned) */ 323 static void iucv_sock_kill(struct sock *sk) 324 { 325 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) 326 return; 327 328 iucv_sock_unlink(&iucv_sk_list, sk); 329 sock_set_flag(sk, SOCK_DEAD); 330 sock_put(sk); 331 } 332 333 /* Terminate an IUCV path */ 334 static void iucv_sever_path(struct sock *sk, int with_user_data) 335 { 336 unsigned char user_data[16]; 337 struct iucv_sock *iucv = iucv_sk(sk); 338 struct iucv_path *path = iucv->path; 339 340 /* Whoever resets the path pointer, must sever and free it. */ 341 if (xchg(&iucv->path, NULL)) { 342 if (with_user_data) { 343 low_nmcpy(user_data, iucv->src_name); 344 high_nmcpy(user_data, iucv->dst_name); 345 ASCEBC(user_data, sizeof(user_data)); 346 pr_iucv->path_sever(path, user_data); 347 } else 348 pr_iucv->path_sever(path, NULL); 349 iucv_path_free(path); 350 } 351 } 352 353 /* Send controlling flags through an IUCV socket for HIPER transport */ 354 static int iucv_send_ctrl(struct sock *sk, u8 flags) 355 { 356 struct iucv_sock *iucv = iucv_sk(sk); 357 int err = 0; 358 int blen; 359 struct sk_buff *skb; 360 u8 shutdown = 0; 361 362 blen = sizeof(struct af_iucv_trans_hdr) + 363 LL_RESERVED_SPACE(iucv->hs_dev); 364 if (sk->sk_shutdown & SEND_SHUTDOWN) { 365 /* controlling flags should be sent anyway */ 366 shutdown = sk->sk_shutdown; 367 sk->sk_shutdown &= RCV_SHUTDOWN; 368 } 369 skb = sock_alloc_send_skb(sk, blen, 1, &err); 370 if (skb) { 371 skb_reserve(skb, blen); 372 err = afiucv_hs_send(NULL, sk, skb, flags); 373 } 374 if (shutdown) 375 sk->sk_shutdown = shutdown; 376 return err; 377 } 378 379 /* Close an IUCV socket */ 380 static void iucv_sock_close(struct sock *sk) 381 { 382 struct iucv_sock *iucv = iucv_sk(sk); 383 unsigned long timeo; 384 int err = 0; 385 386 lock_sock(sk); 387 388 switch (sk->sk_state) { 389 case IUCV_LISTEN: 390 iucv_sock_cleanup_listen(sk); 391 break; 392 393 case IUCV_CONNECTED: 394 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 395 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 396 sk->sk_state = IUCV_DISCONN; 397 sk->sk_state_change(sk); 398 } 399 fallthrough; 400 401 case IUCV_DISCONN: 402 sk->sk_state = IUCV_CLOSING; 403 sk->sk_state_change(sk); 404 405 if (!err && atomic_read(&iucv->skbs_in_xmit) > 0) { 406 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) 407 timeo = sk->sk_lingertime; 408 else 409 timeo = IUCV_DISCONN_TIMEOUT; 410 iucv_sock_wait(sk, 411 iucv_sock_in_state(sk, IUCV_CLOSED, 0), 412 timeo); 413 } 414 fallthrough; 415 416 case IUCV_CLOSING: 417 sk->sk_state = IUCV_CLOSED; 418 sk->sk_state_change(sk); 419 420 sk->sk_err = ECONNRESET; 421 sk->sk_state_change(sk); 422 423 skb_queue_purge(&iucv->send_skb_q); 424 skb_queue_purge(&iucv->backlog_skb_q); 425 fallthrough; 426 427 default: 428 iucv_sever_path(sk, 1); 429 } 430 431 if (iucv->hs_dev) { 432 dev_put(iucv->hs_dev); 433 iucv->hs_dev = NULL; 434 sk->sk_bound_dev_if = 0; 435 } 436 437 /* mark socket for deletion by iucv_sock_kill() */ 438 sock_set_flag(sk, SOCK_ZAPPED); 439 440 release_sock(sk); 441 } 442 443 static void iucv_sock_init(struct sock *sk, struct sock *parent) 444 { 445 if (parent) { 446 sk->sk_type = parent->sk_type; 447 security_sk_clone(parent, sk); 448 } 449 } 450 451 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern) 452 { 453 struct sock *sk; 454 struct iucv_sock *iucv; 455 456 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern); 457 if (!sk) 458 return NULL; 459 iucv = iucv_sk(sk); 460 461 sock_init_data(sock, sk); 462 INIT_LIST_HEAD(&iucv->accept_q); 463 spin_lock_init(&iucv->accept_q_lock); 464 skb_queue_head_init(&iucv->send_skb_q); 465 INIT_LIST_HEAD(&iucv->message_q.list); 466 spin_lock_init(&iucv->message_q.lock); 467 skb_queue_head_init(&iucv->backlog_skb_q); 468 iucv->send_tag = 0; 469 atomic_set(&iucv->pendings, 0); 470 iucv->flags = 0; 471 iucv->msglimit = 0; 472 atomic_set(&iucv->skbs_in_xmit, 0); 473 atomic_set(&iucv->msg_sent, 0); 474 atomic_set(&iucv->msg_recv, 0); 475 iucv->path = NULL; 476 iucv->sk_txnotify = afiucv_hs_callback_txnotify; 477 memset(&iucv->init, 0, sizeof(iucv->init)); 478 if (pr_iucv) 479 iucv->transport = AF_IUCV_TRANS_IUCV; 480 else 481 iucv->transport = AF_IUCV_TRANS_HIPER; 482 483 sk->sk_destruct = iucv_sock_destruct; 484 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; 485 486 sock_reset_flag(sk, SOCK_ZAPPED); 487 488 sk->sk_protocol = proto; 489 sk->sk_state = IUCV_OPEN; 490 491 iucv_sock_link(&iucv_sk_list, sk); 492 return sk; 493 } 494 495 static void iucv_accept_enqueue(struct sock *parent, struct sock *sk) 496 { 497 unsigned long flags; 498 struct iucv_sock *par = iucv_sk(parent); 499 500 sock_hold(sk); 501 spin_lock_irqsave(&par->accept_q_lock, flags); 502 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); 503 spin_unlock_irqrestore(&par->accept_q_lock, flags); 504 iucv_sk(sk)->parent = parent; 505 sk_acceptq_added(parent); 506 } 507 508 static void iucv_accept_unlink(struct sock *sk) 509 { 510 unsigned long flags; 511 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); 512 513 spin_lock_irqsave(&par->accept_q_lock, flags); 514 list_del_init(&iucv_sk(sk)->accept_q); 515 spin_unlock_irqrestore(&par->accept_q_lock, flags); 516 sk_acceptq_removed(iucv_sk(sk)->parent); 517 iucv_sk(sk)->parent = NULL; 518 sock_put(sk); 519 } 520 521 static struct sock *iucv_accept_dequeue(struct sock *parent, 522 struct socket *newsock) 523 { 524 struct iucv_sock *isk, *n; 525 struct sock *sk; 526 527 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 528 sk = (struct sock *) isk; 529 lock_sock(sk); 530 531 if (sk->sk_state == IUCV_CLOSED) { 532 iucv_accept_unlink(sk); 533 release_sock(sk); 534 continue; 535 } 536 537 if (sk->sk_state == IUCV_CONNECTED || 538 sk->sk_state == IUCV_DISCONN || 539 !newsock) { 540 iucv_accept_unlink(sk); 541 if (newsock) 542 sock_graft(sk, newsock); 543 544 release_sock(sk); 545 return sk; 546 } 547 548 release_sock(sk); 549 } 550 return NULL; 551 } 552 553 static void __iucv_auto_name(struct iucv_sock *iucv) 554 { 555 char name[12]; 556 557 scnprintf(name, sizeof(name), 558 "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); 559 while (__iucv_get_sock_by_name(name)) { 560 scnprintf(name, sizeof(name), "%08x", 561 atomic_inc_return(&iucv_sk_list.autobind_name)); 562 } 563 memcpy(iucv->src_name, name, 8); 564 } 565 566 /* Bind an unbound socket */ 567 static int iucv_sock_bind(struct socket *sock, struct sockaddr_unsized *addr, 568 int addr_len) 569 { 570 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); 571 char uid[sizeof(sa->siucv_user_id)]; 572 struct sock *sk = sock->sk; 573 struct iucv_sock *iucv; 574 int err = 0; 575 struct net_device *dev; 576 577 /* Verify the input sockaddr */ 578 if (addr_len < sizeof(struct sockaddr_iucv) || 579 addr->sa_family != AF_IUCV) 580 return -EINVAL; 581 582 lock_sock(sk); 583 if (sk->sk_state != IUCV_OPEN) { 584 err = -EBADFD; 585 goto done; 586 } 587 588 write_lock_bh(&iucv_sk_list.lock); 589 590 iucv = iucv_sk(sk); 591 if (__iucv_get_sock_by_name(sa->siucv_name)) { 592 err = -EADDRINUSE; 593 goto done_unlock; 594 } 595 if (iucv->path) 596 goto done_unlock; 597 598 /* Bind the socket */ 599 if (pr_iucv) 600 if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) 601 goto vm_bind; /* VM IUCV transport */ 602 603 /* try hiper transport */ 604 memcpy(uid, sa->siucv_user_id, sizeof(uid)); 605 ASCEBC(uid, 8); 606 rcu_read_lock(); 607 for_each_netdev_rcu(&init_net, dev) { 608 if (!memcmp(dev->perm_addr, uid, 8)) { 609 memcpy(iucv->src_user_id, sa->siucv_user_id, 8); 610 /* Check for uninitialized siucv_name */ 611 if (strncmp(sa->siucv_name, " ", 8) == 0) 612 __iucv_auto_name(iucv); 613 else 614 memcpy(iucv->src_name, sa->siucv_name, 8); 615 sk->sk_bound_dev_if = dev->ifindex; 616 iucv->hs_dev = dev; 617 dev_hold(dev); 618 sk->sk_state = IUCV_BOUND; 619 iucv->transport = AF_IUCV_TRANS_HIPER; 620 if (!iucv->msglimit) 621 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; 622 rcu_read_unlock(); 623 goto done_unlock; 624 } 625 } 626 rcu_read_unlock(); 627 vm_bind: 628 if (pr_iucv) { 629 /* use local userid for backward compat */ 630 memcpy(iucv->src_name, sa->siucv_name, 8); 631 memcpy(iucv->src_user_id, iucv_userid, 8); 632 sk->sk_state = IUCV_BOUND; 633 iucv->transport = AF_IUCV_TRANS_IUCV; 634 sk->sk_allocation |= GFP_DMA; 635 if (!iucv->msglimit) 636 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 637 goto done_unlock; 638 } 639 /* found no dev to bind */ 640 err = -ENODEV; 641 done_unlock: 642 /* Release the socket list lock */ 643 write_unlock_bh(&iucv_sk_list.lock); 644 done: 645 release_sock(sk); 646 return err; 647 } 648 649 /* Automatically bind an unbound socket */ 650 static int iucv_sock_autobind(struct sock *sk) 651 { 652 struct iucv_sock *iucv = iucv_sk(sk); 653 int err = 0; 654 655 if (unlikely(!pr_iucv)) 656 return -EPROTO; 657 658 memcpy(iucv->src_user_id, iucv_userid, 8); 659 iucv->transport = AF_IUCV_TRANS_IUCV; 660 sk->sk_allocation |= GFP_DMA; 661 662 write_lock_bh(&iucv_sk_list.lock); 663 __iucv_auto_name(iucv); 664 write_unlock_bh(&iucv_sk_list.lock); 665 666 if (!iucv->msglimit) 667 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 668 669 return err; 670 } 671 672 static int afiucv_path_connect(struct socket *sock, struct sockaddr_unsized *addr) 673 { 674 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); 675 struct sock *sk = sock->sk; 676 struct iucv_sock *iucv = iucv_sk(sk); 677 unsigned char user_data[16]; 678 int err; 679 680 high_nmcpy(user_data, sa->siucv_name); 681 low_nmcpy(user_data, iucv->src_name); 682 ASCEBC(user_data, sizeof(user_data)); 683 684 /* Create path. */ 685 iucv->path = iucv_path_alloc(iucv->msglimit, 686 IUCV_IPRMDATA, GFP_KERNEL); 687 if (!iucv->path) { 688 err = -ENOMEM; 689 goto done; 690 } 691 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, 692 sa->siucv_user_id, NULL, user_data, 693 sk); 694 if (err) { 695 iucv_path_free(iucv->path); 696 iucv->path = NULL; 697 switch (err) { 698 case 0x0b: /* Target communicator is not logged on */ 699 err = -ENETUNREACH; 700 break; 701 case 0x0d: /* Max connections for this guest exceeded */ 702 case 0x0e: /* Max connections for target guest exceeded */ 703 err = -EAGAIN; 704 break; 705 case 0x0f: /* Missing IUCV authorization */ 706 err = -EACCES; 707 break; 708 default: 709 err = -ECONNREFUSED; 710 break; 711 } 712 } 713 done: 714 return err; 715 } 716 717 /* Connect an unconnected socket */ 718 static int iucv_sock_connect(struct socket *sock, struct sockaddr_unsized *addr, 719 int alen, int flags) 720 { 721 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); 722 struct sock *sk = sock->sk; 723 struct iucv_sock *iucv = iucv_sk(sk); 724 int err; 725 726 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV) 727 return -EINVAL; 728 729 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) 730 return -EBADFD; 731 732 if (sk->sk_state == IUCV_OPEN && 733 iucv->transport == AF_IUCV_TRANS_HIPER) 734 return -EBADFD; /* explicit bind required */ 735 736 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) 737 return -EINVAL; 738 739 if (sk->sk_state == IUCV_OPEN) { 740 err = iucv_sock_autobind(sk); 741 if (unlikely(err)) 742 return err; 743 } 744 745 lock_sock(sk); 746 747 /* Set the destination information */ 748 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); 749 memcpy(iucv->dst_name, sa->siucv_name, 8); 750 751 if (iucv->transport == AF_IUCV_TRANS_HIPER) 752 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); 753 else 754 err = afiucv_path_connect(sock, addr); 755 if (err) 756 goto done; 757 758 if (sk->sk_state != IUCV_CONNECTED) 759 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, 760 IUCV_DISCONN), 761 sock_sndtimeo(sk, flags & O_NONBLOCK)); 762 763 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) 764 err = -ECONNREFUSED; 765 766 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) 767 iucv_sever_path(sk, 0); 768 769 done: 770 release_sock(sk); 771 return err; 772 } 773 774 /* Move a socket into listening state. */ 775 static int iucv_sock_listen(struct socket *sock, int backlog) 776 { 777 struct sock *sk = sock->sk; 778 int err; 779 780 lock_sock(sk); 781 782 err = -EINVAL; 783 if (sk->sk_state != IUCV_BOUND) 784 goto done; 785 786 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) 787 goto done; 788 789 sk->sk_max_ack_backlog = backlog; 790 sk->sk_ack_backlog = 0; 791 sk->sk_state = IUCV_LISTEN; 792 err = 0; 793 794 done: 795 release_sock(sk); 796 return err; 797 } 798 799 /* Accept a pending connection */ 800 static int iucv_sock_accept(struct socket *sock, struct socket *newsock, 801 struct proto_accept_arg *arg) 802 { 803 DECLARE_WAITQUEUE(wait, current); 804 struct sock *sk = sock->sk, *nsk; 805 long timeo; 806 int err = 0; 807 808 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 809 810 if (sk->sk_state != IUCV_LISTEN) { 811 err = -EBADFD; 812 goto done; 813 } 814 815 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK); 816 817 /* Wait for an incoming connection */ 818 add_wait_queue_exclusive(sk_sleep(sk), &wait); 819 while (!(nsk = iucv_accept_dequeue(sk, newsock))) { 820 set_current_state(TASK_INTERRUPTIBLE); 821 if (!timeo) { 822 err = -EAGAIN; 823 break; 824 } 825 826 release_sock(sk); 827 timeo = schedule_timeout(timeo); 828 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 829 830 if (sk->sk_state != IUCV_LISTEN) { 831 err = -EBADFD; 832 break; 833 } 834 835 if (signal_pending(current)) { 836 err = sock_intr_errno(timeo); 837 break; 838 } 839 } 840 841 set_current_state(TASK_RUNNING); 842 remove_wait_queue(sk_sleep(sk), &wait); 843 844 if (err) 845 goto done; 846 847 newsock->state = SS_CONNECTED; 848 849 done: 850 release_sock(sk); 851 return err; 852 } 853 854 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, 855 int peer) 856 { 857 DECLARE_SOCKADDR(struct sockaddr_iucv *, siucv, addr); 858 struct sock *sk = sock->sk; 859 struct iucv_sock *iucv = iucv_sk(sk); 860 861 addr->sa_family = AF_IUCV; 862 863 if (peer) { 864 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); 865 memcpy(siucv->siucv_name, iucv->dst_name, 8); 866 } else { 867 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); 868 memcpy(siucv->siucv_name, iucv->src_name, 8); 869 } 870 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); 871 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); 872 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); 873 874 return sizeof(struct sockaddr_iucv); 875 } 876 877 /** 878 * iucv_send_iprm() - Send socket data in parameter list of an iucv message. 879 * @path: IUCV path 880 * @msg: Pointer to a struct iucv_message 881 * @skb: The socket data to send, skb->len MUST BE <= 7 882 * 883 * Send the socket data in the parameter list in the iucv message 884 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter 885 * list and the socket data len at index 7 (last byte). 886 * See also iucv_msg_length(). 887 * 888 * Returns: the return code from the iucv_message_send() call. 889 */ 890 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, 891 struct sk_buff *skb) 892 { 893 u8 prmdata[8]; 894 895 memcpy(prmdata, (void *) skb->data, skb->len); 896 prmdata[7] = 0xff - (u8) skb->len; 897 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, 898 (void *) prmdata, 8); 899 } 900 901 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg, 902 size_t len) 903 { 904 struct sock *sk = sock->sk; 905 struct iucv_sock *iucv = iucv_sk(sk); 906 size_t headroom = 0; 907 size_t linear; 908 struct sk_buff *skb; 909 struct iucv_message txmsg = {0}; 910 struct cmsghdr *cmsg; 911 int cmsg_done; 912 long timeo; 913 char user_id[9]; 914 char appl_id[9]; 915 int err; 916 int noblock = msg->msg_flags & MSG_DONTWAIT; 917 918 err = sock_error(sk); 919 if (err) 920 return err; 921 922 if (msg->msg_flags & MSG_OOB) 923 return -EOPNOTSUPP; 924 925 /* SOCK_SEQPACKET: we do not support segmented records */ 926 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) 927 return -EOPNOTSUPP; 928 929 lock_sock(sk); 930 931 if (sk->sk_shutdown & SEND_SHUTDOWN) { 932 err = -EPIPE; 933 goto out; 934 } 935 936 /* Return if the socket is not in connected state */ 937 if (sk->sk_state != IUCV_CONNECTED) { 938 err = -ENOTCONN; 939 goto out; 940 } 941 942 /* initialize defaults */ 943 cmsg_done = 0; /* check for duplicate headers */ 944 945 /* iterate over control messages */ 946 for_each_cmsghdr(cmsg, msg) { 947 if (!CMSG_OK(msg, cmsg)) { 948 err = -EINVAL; 949 goto out; 950 } 951 952 if (cmsg->cmsg_level != SOL_IUCV) 953 continue; 954 955 if (cmsg->cmsg_type & cmsg_done) { 956 err = -EINVAL; 957 goto out; 958 } 959 cmsg_done |= cmsg->cmsg_type; 960 961 switch (cmsg->cmsg_type) { 962 case SCM_IUCV_TRGCLS: 963 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { 964 err = -EINVAL; 965 goto out; 966 } 967 968 /* set iucv message target class */ 969 memcpy(&txmsg.class, 970 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); 971 972 break; 973 974 default: 975 err = -EINVAL; 976 goto out; 977 } 978 } 979 980 /* allocate one skb for each iucv message: 981 * this is fine for SOCK_SEQPACKET (unless we want to support 982 * segmented records using the MSG_EOR flag), but 983 * for SOCK_STREAM we might want to improve it in future */ 984 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 985 headroom = sizeof(struct af_iucv_trans_hdr) + 986 LL_RESERVED_SPACE(iucv->hs_dev); 987 linear = min(len, PAGE_SIZE - headroom); 988 } else { 989 if (len < PAGE_SIZE) { 990 linear = len; 991 } else { 992 /* In nonlinear "classic" iucv skb, 993 * reserve space for iucv_array 994 */ 995 headroom = sizeof(struct iucv_array) * 996 (MAX_SKB_FRAGS + 1); 997 linear = PAGE_SIZE - headroom; 998 } 999 } 1000 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear, 1001 noblock, &err, 0); 1002 if (!skb) 1003 goto out; 1004 if (headroom) 1005 skb_reserve(skb, headroom); 1006 skb_put(skb, linear); 1007 skb->len = len; 1008 skb->data_len = len - linear; 1009 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len); 1010 if (err) 1011 goto fail; 1012 1013 /* wait if outstanding messages for iucv path has reached */ 1014 timeo = sock_sndtimeo(sk, noblock); 1015 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); 1016 if (err) 1017 goto fail; 1018 1019 /* return -ECONNRESET if the socket is no longer connected */ 1020 if (sk->sk_state != IUCV_CONNECTED) { 1021 err = -ECONNRESET; 1022 goto fail; 1023 } 1024 1025 /* increment and save iucv message tag for msg_completion cbk */ 1026 txmsg.tag = iucv->send_tag++; 1027 IUCV_SKB_CB(skb)->tag = txmsg.tag; 1028 1029 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1030 atomic_inc(&iucv->msg_sent); 1031 err = afiucv_hs_send(&txmsg, sk, skb, 0); 1032 if (err) { 1033 atomic_dec(&iucv->msg_sent); 1034 goto out; 1035 } 1036 } else { /* Classic VM IUCV transport */ 1037 skb_queue_tail(&iucv->send_skb_q, skb); 1038 atomic_inc(&iucv->skbs_in_xmit); 1039 1040 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) && 1041 skb->len <= 7) { 1042 err = iucv_send_iprm(iucv->path, &txmsg, skb); 1043 1044 /* on success: there is no message_complete callback */ 1045 /* for an IPRMDATA msg; remove skb from send queue */ 1046 if (err == 0) { 1047 atomic_dec(&iucv->skbs_in_xmit); 1048 skb_unlink(skb, &iucv->send_skb_q); 1049 consume_skb(skb); 1050 } 1051 1052 /* this error should never happen since the */ 1053 /* IUCV_IPRMDATA path flag is set... sever path */ 1054 if (err == 0x15) { 1055 pr_iucv->path_sever(iucv->path, NULL); 1056 atomic_dec(&iucv->skbs_in_xmit); 1057 skb_unlink(skb, &iucv->send_skb_q); 1058 err = -EPIPE; 1059 goto fail; 1060 } 1061 } else if (skb_is_nonlinear(skb)) { 1062 struct iucv_array *iba = (struct iucv_array *)skb->head; 1063 int i; 1064 1065 /* skip iucv_array lying in the headroom */ 1066 iba[0].address = virt_to_dma32(skb->data); 1067 iba[0].length = (u32)skb_headlen(skb); 1068 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1069 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1070 1071 iba[i + 1].address = virt_to_dma32(skb_frag_address(frag)); 1072 iba[i + 1].length = (u32)skb_frag_size(frag); 1073 } 1074 err = pr_iucv->message_send(iucv->path, &txmsg, 1075 IUCV_IPBUFLST, 0, 1076 (void *)iba, skb->len); 1077 } else { /* non-IPRM Linear skb */ 1078 err = pr_iucv->message_send(iucv->path, &txmsg, 1079 0, 0, (void *)skb->data, skb->len); 1080 } 1081 if (err) { 1082 if (err == 3) { 1083 user_id[8] = 0; 1084 memcpy(user_id, iucv->dst_user_id, 8); 1085 appl_id[8] = 0; 1086 memcpy(appl_id, iucv->dst_name, 8); 1087 pr_err( 1088 "Application %s on z/VM guest %s exceeds message limit\n", 1089 appl_id, user_id); 1090 err = -EAGAIN; 1091 } else { 1092 err = -EPIPE; 1093 } 1094 1095 atomic_dec(&iucv->skbs_in_xmit); 1096 skb_unlink(skb, &iucv->send_skb_q); 1097 goto fail; 1098 } 1099 } 1100 1101 release_sock(sk); 1102 return len; 1103 1104 fail: 1105 kfree_skb(skb); 1106 out: 1107 release_sock(sk); 1108 return err; 1109 } 1110 1111 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len) 1112 { 1113 size_t headroom, linear; 1114 struct sk_buff *skb; 1115 int err; 1116 1117 if (len < PAGE_SIZE) { 1118 headroom = 0; 1119 linear = len; 1120 } else { 1121 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1); 1122 linear = PAGE_SIZE - headroom; 1123 } 1124 skb = alloc_skb_with_frags(headroom + linear, len - linear, 1125 0, &err, GFP_ATOMIC | GFP_DMA); 1126 WARN_ONCE(!skb, 1127 "alloc of recv iucv skb len=%lu failed with errcode=%d\n", 1128 len, err); 1129 if (skb) { 1130 if (headroom) 1131 skb_reserve(skb, headroom); 1132 skb_put(skb, linear); 1133 skb->len = len; 1134 skb->data_len = len - linear; 1135 } 1136 return skb; 1137 } 1138 1139 /* iucv_process_message() - Receive a single outstanding IUCV message 1140 * 1141 * Locking: must be called with message_q.lock held 1142 */ 1143 static void iucv_process_message(struct sock *sk, struct sk_buff *skb, 1144 struct iucv_path *path, 1145 struct iucv_message *msg) 1146 { 1147 int rc; 1148 unsigned int len; 1149 1150 len = iucv_msg_length(msg); 1151 1152 /* store msg target class in the second 4 bytes of skb ctrl buffer */ 1153 /* Note: the first 4 bytes are reserved for msg tag */ 1154 IUCV_SKB_CB(skb)->class = msg->class; 1155 1156 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ 1157 if ((msg->flags & IUCV_IPRMDATA) && len > 7) { 1158 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { 1159 skb->data = NULL; 1160 skb->len = 0; 1161 } 1162 } else { 1163 if (skb_is_nonlinear(skb)) { 1164 struct iucv_array *iba = (struct iucv_array *)skb->head; 1165 int i; 1166 1167 iba[0].address = virt_to_dma32(skb->data); 1168 iba[0].length = (u32)skb_headlen(skb); 1169 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1170 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1171 1172 iba[i + 1].address = virt_to_dma32(skb_frag_address(frag)); 1173 iba[i + 1].length = (u32)skb_frag_size(frag); 1174 } 1175 rc = pr_iucv->message_receive(path, msg, 1176 IUCV_IPBUFLST, 1177 (void *)iba, len, NULL); 1178 } else { 1179 rc = pr_iucv->message_receive(path, msg, 1180 msg->flags & IUCV_IPRMDATA, 1181 skb->data, len, NULL); 1182 } 1183 if (rc) { 1184 kfree_skb(skb); 1185 return; 1186 } 1187 WARN_ON_ONCE(skb->len != len); 1188 } 1189 1190 IUCV_SKB_CB(skb)->offset = 0; 1191 if (sk_filter(sk, skb)) { 1192 sk_drops_inc(sk); /* skb rejected by filter */ 1193 kfree_skb(skb); 1194 return; 1195 } 1196 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */ 1197 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 1198 } 1199 1200 /* iucv_process_message_q() - Process outstanding IUCV messages 1201 * 1202 * Locking: must be called with message_q.lock held 1203 */ 1204 static void iucv_process_message_q(struct sock *sk) 1205 { 1206 struct iucv_sock *iucv = iucv_sk(sk); 1207 struct sk_buff *skb; 1208 struct sock_msg_q *p, *n; 1209 1210 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 1211 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg)); 1212 if (!skb) 1213 break; 1214 iucv_process_message(sk, skb, p->path, &p->msg); 1215 list_del(&p->list); 1216 kfree(p); 1217 if (!skb_queue_empty(&iucv->backlog_skb_q)) 1218 break; 1219 } 1220 } 1221 1222 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg, 1223 size_t len, int flags) 1224 { 1225 struct sock *sk = sock->sk; 1226 struct iucv_sock *iucv = iucv_sk(sk); 1227 unsigned int copied, rlen; 1228 struct sk_buff *skb, *rskb, *cskb; 1229 int err = 0; 1230 u32 offset; 1231 1232 if ((sk->sk_state == IUCV_DISCONN) && 1233 skb_queue_empty(&iucv->backlog_skb_q) && 1234 skb_queue_empty(&sk->sk_receive_queue) && 1235 list_empty(&iucv->message_q.list)) 1236 return 0; 1237 1238 if (flags & (MSG_OOB)) 1239 return -EOPNOTSUPP; 1240 1241 /* receive/dequeue next skb: 1242 * the function understands MSG_PEEK and, thus, does not dequeue skb 1243 * only refcount is increased. 1244 */ 1245 skb = skb_recv_datagram(sk, flags, &err); 1246 if (!skb) { 1247 if (sk->sk_shutdown & RCV_SHUTDOWN) 1248 return 0; 1249 return err; 1250 } 1251 1252 offset = IUCV_SKB_CB(skb)->offset; 1253 rlen = skb->len - offset; /* real length of skb */ 1254 copied = min_t(unsigned int, rlen, len); 1255 if (!rlen) 1256 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; 1257 1258 cskb = skb; 1259 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) { 1260 err = -EFAULT; 1261 goto err_out; 1262 } 1263 1264 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ 1265 if (sk->sk_type == SOCK_SEQPACKET) { 1266 if (copied < rlen) 1267 msg->msg_flags |= MSG_TRUNC; 1268 /* each iucv message contains a complete record */ 1269 msg->msg_flags |= MSG_EOR; 1270 } 1271 1272 /* create control message to store iucv msg target class: 1273 * get the trgcls from the control buffer of the skb due to 1274 * fragmentation of original iucv message. */ 1275 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, 1276 sizeof(IUCV_SKB_CB(skb)->class), 1277 (void *)&IUCV_SKB_CB(skb)->class); 1278 if (err) 1279 goto err_out; 1280 1281 /* Mark read part of skb as used */ 1282 if (!(flags & MSG_PEEK)) { 1283 1284 /* SOCK_STREAM: re-queue skb if it contains unreceived data */ 1285 if (sk->sk_type == SOCK_STREAM) { 1286 if (copied < rlen) { 1287 IUCV_SKB_CB(skb)->offset = offset + copied; 1288 skb_queue_head(&sk->sk_receive_queue, skb); 1289 goto done; 1290 } 1291 } 1292 1293 consume_skb(skb); 1294 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1295 atomic_inc(&iucv->msg_recv); 1296 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { 1297 WARN_ON(1); 1298 iucv_sock_close(sk); 1299 return -EFAULT; 1300 } 1301 } 1302 1303 /* Queue backlog skbs */ 1304 spin_lock_bh(&iucv->message_q.lock); 1305 rskb = skb_dequeue(&iucv->backlog_skb_q); 1306 while (rskb) { 1307 IUCV_SKB_CB(rskb)->offset = 0; 1308 if (__sock_queue_rcv_skb(sk, rskb)) { 1309 /* handle rcv queue full */ 1310 skb_queue_head(&iucv->backlog_skb_q, 1311 rskb); 1312 break; 1313 } 1314 rskb = skb_dequeue(&iucv->backlog_skb_q); 1315 } 1316 if (skb_queue_empty(&iucv->backlog_skb_q)) { 1317 if (!list_empty(&iucv->message_q.list)) 1318 iucv_process_message_q(sk); 1319 if (atomic_read(&iucv->msg_recv) >= 1320 iucv->msglimit / 2) { 1321 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); 1322 if (err) { 1323 sk->sk_state = IUCV_DISCONN; 1324 sk->sk_state_change(sk); 1325 } 1326 } 1327 } 1328 spin_unlock_bh(&iucv->message_q.lock); 1329 } 1330 1331 done: 1332 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ 1333 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) 1334 copied = rlen; 1335 if (flags & MSG_PEEK) 1336 skb_unref(skb); 1337 1338 return copied; 1339 1340 err_out: 1341 if (!(flags & MSG_PEEK)) 1342 skb_queue_head(&sk->sk_receive_queue, skb); 1343 else 1344 skb_unref(skb); 1345 1346 return err; 1347 } 1348 1349 static inline __poll_t iucv_accept_poll(struct sock *parent) 1350 { 1351 struct iucv_sock *isk, *n; 1352 struct sock *sk; 1353 1354 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 1355 sk = (struct sock *) isk; 1356 1357 if (sk->sk_state == IUCV_CONNECTED) 1358 return EPOLLIN | EPOLLRDNORM; 1359 } 1360 1361 return 0; 1362 } 1363 1364 static __poll_t iucv_sock_poll(struct file *file, struct socket *sock, 1365 poll_table *wait) 1366 { 1367 struct sock *sk = sock->sk; 1368 __poll_t mask = 0; 1369 1370 sock_poll_wait(file, sock, wait); 1371 1372 if (sk->sk_state == IUCV_LISTEN) 1373 return iucv_accept_poll(sk); 1374 1375 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) 1376 mask |= EPOLLERR | 1377 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0); 1378 1379 if (sk->sk_shutdown & RCV_SHUTDOWN) 1380 mask |= EPOLLRDHUP; 1381 1382 if (sk->sk_shutdown == SHUTDOWN_MASK) 1383 mask |= EPOLLHUP; 1384 1385 if (!skb_queue_empty(&sk->sk_receive_queue) || 1386 (sk->sk_shutdown & RCV_SHUTDOWN)) 1387 mask |= EPOLLIN | EPOLLRDNORM; 1388 1389 if (sk->sk_state == IUCV_CLOSED) 1390 mask |= EPOLLHUP; 1391 1392 if (sk->sk_state == IUCV_DISCONN) 1393 mask |= EPOLLIN; 1394 1395 if (sock_writeable(sk) && iucv_below_msglim(sk)) 1396 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; 1397 else 1398 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 1399 1400 return mask; 1401 } 1402 1403 static int iucv_sock_shutdown(struct socket *sock, int how) 1404 { 1405 struct sock *sk = sock->sk; 1406 struct iucv_sock *iucv = iucv_sk(sk); 1407 struct iucv_message txmsg; 1408 int err = 0; 1409 1410 how++; 1411 1412 if ((how & ~SHUTDOWN_MASK) || !how) 1413 return -EINVAL; 1414 1415 lock_sock(sk); 1416 switch (sk->sk_state) { 1417 case IUCV_LISTEN: 1418 case IUCV_DISCONN: 1419 case IUCV_CLOSING: 1420 case IUCV_CLOSED: 1421 err = -ENOTCONN; 1422 goto fail; 1423 default: 1424 break; 1425 } 1426 1427 if ((how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) && 1428 sk->sk_state == IUCV_CONNECTED) { 1429 if (iucv->transport == AF_IUCV_TRANS_IUCV) { 1430 txmsg.class = 0; 1431 txmsg.tag = 0; 1432 err = pr_iucv->message_send(iucv->path, &txmsg, 1433 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); 1434 if (err) { 1435 switch (err) { 1436 case 1: 1437 err = -ENOTCONN; 1438 break; 1439 case 2: 1440 err = -ECONNRESET; 1441 break; 1442 default: 1443 err = -ENOTCONN; 1444 break; 1445 } 1446 } 1447 } else 1448 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); 1449 } 1450 1451 sk->sk_shutdown |= how; 1452 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { 1453 if ((iucv->transport == AF_IUCV_TRANS_IUCV) && 1454 iucv->path) { 1455 err = pr_iucv->path_quiesce(iucv->path, NULL); 1456 if (err) 1457 err = -ENOTCONN; 1458 /* skb_queue_purge(&sk->sk_receive_queue); */ 1459 } 1460 skb_queue_purge(&sk->sk_receive_queue); 1461 } 1462 1463 /* Wake up anyone sleeping in poll */ 1464 sk->sk_state_change(sk); 1465 1466 fail: 1467 release_sock(sk); 1468 return err; 1469 } 1470 1471 static int iucv_sock_release(struct socket *sock) 1472 { 1473 struct sock *sk = sock->sk; 1474 int err = 0; 1475 1476 if (!sk) 1477 return 0; 1478 1479 iucv_sock_close(sk); 1480 1481 sock_orphan(sk); 1482 iucv_sock_kill(sk); 1483 return err; 1484 } 1485 1486 /* getsockopt and setsockopt */ 1487 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, 1488 sockptr_t optval, unsigned int optlen) 1489 { 1490 struct sock *sk = sock->sk; 1491 struct iucv_sock *iucv = iucv_sk(sk); 1492 int val; 1493 int rc; 1494 1495 if (level != SOL_IUCV) 1496 return -ENOPROTOOPT; 1497 1498 if (optlen < sizeof(int)) 1499 return -EINVAL; 1500 1501 if (copy_from_sockptr(&val, optval, sizeof(int))) 1502 return -EFAULT; 1503 1504 rc = 0; 1505 1506 lock_sock(sk); 1507 switch (optname) { 1508 case SO_IPRMDATA_MSG: 1509 if (val) 1510 iucv->flags |= IUCV_IPRMDATA; 1511 else 1512 iucv->flags &= ~IUCV_IPRMDATA; 1513 break; 1514 case SO_MSGLIMIT: 1515 switch (sk->sk_state) { 1516 case IUCV_OPEN: 1517 case IUCV_BOUND: 1518 if (val < 1 || val > U16_MAX) 1519 rc = -EINVAL; 1520 else 1521 iucv->msglimit = val; 1522 break; 1523 default: 1524 rc = -EINVAL; 1525 break; 1526 } 1527 break; 1528 default: 1529 rc = -ENOPROTOOPT; 1530 break; 1531 } 1532 release_sock(sk); 1533 1534 return rc; 1535 } 1536 1537 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, 1538 char __user *optval, int __user *optlen) 1539 { 1540 struct sock *sk = sock->sk; 1541 struct iucv_sock *iucv = iucv_sk(sk); 1542 unsigned int val; 1543 int len; 1544 1545 if (level != SOL_IUCV) 1546 return -ENOPROTOOPT; 1547 1548 if (get_user(len, optlen)) 1549 return -EFAULT; 1550 1551 if (len < 0) 1552 return -EINVAL; 1553 1554 len = min_t(unsigned int, len, sizeof(int)); 1555 1556 switch (optname) { 1557 case SO_IPRMDATA_MSG: 1558 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; 1559 break; 1560 case SO_MSGLIMIT: 1561 lock_sock(sk); 1562 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ 1563 : iucv->msglimit; /* default */ 1564 release_sock(sk); 1565 break; 1566 case SO_MSGSIZE: 1567 if (sk->sk_state == IUCV_OPEN) 1568 return -EBADFD; 1569 val = (iucv->hs_dev) ? iucv->hs_dev->mtu - 1570 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : 1571 0x7fffffff; 1572 break; 1573 default: 1574 return -ENOPROTOOPT; 1575 } 1576 1577 if (put_user(len, optlen)) 1578 return -EFAULT; 1579 if (copy_to_user(optval, &val, len)) 1580 return -EFAULT; 1581 1582 return 0; 1583 } 1584 1585 1586 /* Callback wrappers - called from iucv base support */ 1587 static int iucv_callback_connreq(struct iucv_path *path, 1588 u8 ipvmid[8], u8 ipuser[16]) 1589 { 1590 unsigned char user_data[16]; 1591 unsigned char nuser_data[16]; 1592 unsigned char src_name[8]; 1593 struct sock *sk, *nsk; 1594 struct iucv_sock *iucv, *niucv; 1595 int err; 1596 1597 memcpy(src_name, ipuser, 8); 1598 EBCASC(src_name, 8); 1599 /* Find out if this path belongs to af_iucv. */ 1600 read_lock(&iucv_sk_list.lock); 1601 iucv = NULL; 1602 sk = NULL; 1603 sk_for_each(sk, &iucv_sk_list.head) 1604 if (sk->sk_state == IUCV_LISTEN && 1605 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { 1606 /* 1607 * Found a listening socket with 1608 * src_name == ipuser[0-7]. 1609 */ 1610 iucv = iucv_sk(sk); 1611 break; 1612 } 1613 read_unlock(&iucv_sk_list.lock); 1614 if (!iucv) 1615 /* No socket found, not one of our paths. */ 1616 return -EINVAL; 1617 1618 bh_lock_sock(sk); 1619 1620 /* Check if parent socket is listening */ 1621 low_nmcpy(user_data, iucv->src_name); 1622 high_nmcpy(user_data, iucv->dst_name); 1623 ASCEBC(user_data, sizeof(user_data)); 1624 if (sk->sk_state != IUCV_LISTEN) { 1625 err = pr_iucv->path_sever(path, user_data); 1626 iucv_path_free(path); 1627 goto fail; 1628 } 1629 1630 /* Check for backlog size */ 1631 if (sk_acceptq_is_full(sk)) { 1632 err = pr_iucv->path_sever(path, user_data); 1633 iucv_path_free(path); 1634 goto fail; 1635 } 1636 1637 /* Create the new socket */ 1638 nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0); 1639 if (!nsk) { 1640 err = pr_iucv->path_sever(path, user_data); 1641 iucv_path_free(path); 1642 goto fail; 1643 } 1644 1645 niucv = iucv_sk(nsk); 1646 iucv_sock_init(nsk, sk); 1647 niucv->transport = AF_IUCV_TRANS_IUCV; 1648 nsk->sk_allocation |= GFP_DMA; 1649 1650 /* Set the new iucv_sock */ 1651 memcpy(niucv->dst_name, ipuser + 8, 8); 1652 EBCASC(niucv->dst_name, 8); 1653 memcpy(niucv->dst_user_id, ipvmid, 8); 1654 memcpy(niucv->src_name, iucv->src_name, 8); 1655 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1656 niucv->path = path; 1657 1658 /* Call iucv_accept */ 1659 high_nmcpy(nuser_data, ipuser + 8); 1660 memcpy(nuser_data + 8, niucv->src_name, 8); 1661 ASCEBC(nuser_data + 8, 8); 1662 1663 /* set message limit for path based on msglimit of accepting socket */ 1664 niucv->msglimit = iucv->msglimit; 1665 path->msglim = iucv->msglimit; 1666 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); 1667 if (err) { 1668 iucv_sever_path(nsk, 1); 1669 iucv_sock_kill(nsk); 1670 goto fail; 1671 } 1672 1673 iucv_accept_enqueue(sk, nsk); 1674 1675 /* Wake up accept */ 1676 nsk->sk_state = IUCV_CONNECTED; 1677 sk->sk_data_ready(sk); 1678 err = 0; 1679 fail: 1680 bh_unlock_sock(sk); 1681 return 0; 1682 } 1683 1684 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) 1685 { 1686 struct sock *sk = path->private; 1687 1688 sk->sk_state = IUCV_CONNECTED; 1689 sk->sk_state_change(sk); 1690 } 1691 1692 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) 1693 { 1694 struct sock *sk = path->private; 1695 struct iucv_sock *iucv = iucv_sk(sk); 1696 struct sk_buff *skb; 1697 struct sock_msg_q *save_msg; 1698 int len; 1699 1700 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1701 pr_iucv->message_reject(path, msg); 1702 return; 1703 } 1704 1705 spin_lock(&iucv->message_q.lock); 1706 1707 if (!list_empty(&iucv->message_q.list) || 1708 !skb_queue_empty(&iucv->backlog_skb_q)) 1709 goto save_message; 1710 1711 len = atomic_read(&sk->sk_rmem_alloc); 1712 len += SKB_TRUESIZE(iucv_msg_length(msg)); 1713 if (len > sk->sk_rcvbuf) 1714 goto save_message; 1715 1716 skb = alloc_iucv_recv_skb(iucv_msg_length(msg)); 1717 if (!skb) 1718 goto save_message; 1719 1720 iucv_process_message(sk, skb, path, msg); 1721 goto out_unlock; 1722 1723 save_message: 1724 save_msg = kzalloc_obj(struct sock_msg_q, GFP_ATOMIC | GFP_DMA); 1725 if (!save_msg) 1726 goto out_unlock; 1727 save_msg->path = path; 1728 save_msg->msg = *msg; 1729 1730 list_add_tail(&save_msg->list, &iucv->message_q.list); 1731 1732 out_unlock: 1733 spin_unlock(&iucv->message_q.lock); 1734 } 1735 1736 static void iucv_callback_txdone(struct iucv_path *path, 1737 struct iucv_message *msg) 1738 { 1739 struct sock *sk = path->private; 1740 struct sk_buff *this = NULL; 1741 struct sk_buff_head *list; 1742 struct sk_buff *list_skb; 1743 struct iucv_sock *iucv; 1744 unsigned long flags; 1745 1746 iucv = iucv_sk(sk); 1747 list = &iucv->send_skb_q; 1748 1749 bh_lock_sock(sk); 1750 1751 spin_lock_irqsave(&list->lock, flags); 1752 skb_queue_walk(list, list_skb) { 1753 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { 1754 this = list_skb; 1755 break; 1756 } 1757 } 1758 if (this) { 1759 atomic_dec(&iucv->skbs_in_xmit); 1760 __skb_unlink(this, list); 1761 } 1762 1763 spin_unlock_irqrestore(&list->lock, flags); 1764 1765 if (this) { 1766 consume_skb(this); 1767 /* wake up any process waiting for sending */ 1768 iucv_sock_wake_msglim(sk); 1769 } 1770 1771 if (sk->sk_state == IUCV_CLOSING) { 1772 if (atomic_read(&iucv->skbs_in_xmit) == 0) { 1773 sk->sk_state = IUCV_CLOSED; 1774 sk->sk_state_change(sk); 1775 } 1776 } 1777 bh_unlock_sock(sk); 1778 1779 } 1780 1781 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) 1782 { 1783 struct sock *sk = path->private; 1784 1785 if (sk->sk_state == IUCV_CLOSED) 1786 return; 1787 1788 bh_lock_sock(sk); 1789 iucv_sever_path(sk, 1); 1790 sk->sk_state = IUCV_DISCONN; 1791 1792 sk->sk_state_change(sk); 1793 bh_unlock_sock(sk); 1794 } 1795 1796 /* called if the other communication side shuts down its RECV direction; 1797 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. 1798 */ 1799 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) 1800 { 1801 struct sock *sk = path->private; 1802 1803 bh_lock_sock(sk); 1804 if (sk->sk_state != IUCV_CLOSED) { 1805 sk->sk_shutdown |= SEND_SHUTDOWN; 1806 sk->sk_state_change(sk); 1807 } 1808 bh_unlock_sock(sk); 1809 } 1810 1811 static struct iucv_handler af_iucv_handler = { 1812 .path_pending = iucv_callback_connreq, 1813 .path_complete = iucv_callback_connack, 1814 .path_severed = iucv_callback_connrej, 1815 .message_pending = iucv_callback_rx, 1816 .message_complete = iucv_callback_txdone, 1817 .path_quiesced = iucv_callback_shutdown, 1818 }; 1819 1820 /***************** HiperSockets transport callbacks ********************/ 1821 static void afiucv_swap_src_dest(struct sk_buff *skb) 1822 { 1823 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); 1824 char tmpID[8]; 1825 char tmpName[8]; 1826 1827 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 1828 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 1829 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 1830 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 1831 memcpy(tmpID, trans_hdr->srcUserID, 8); 1832 memcpy(tmpName, trans_hdr->srcAppName, 8); 1833 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); 1834 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); 1835 memcpy(trans_hdr->destUserID, tmpID, 8); 1836 memcpy(trans_hdr->destAppName, tmpName, 8); 1837 skb_push(skb, ETH_HLEN); 1838 memset(skb->data, 0, ETH_HLEN); 1839 } 1840 1841 /* 1842 * afiucv_hs_callback_syn - react on received SYN 1843 */ 1844 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) 1845 { 1846 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); 1847 struct sock *nsk; 1848 struct iucv_sock *iucv, *niucv; 1849 int err; 1850 1851 iucv = iucv_sk(sk); 1852 if (!iucv) { 1853 /* no sock - connection refused */ 1854 afiucv_swap_src_dest(skb); 1855 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1856 err = dev_queue_xmit(skb); 1857 goto out; 1858 } 1859 1860 nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0); 1861 bh_lock_sock(sk); 1862 if ((sk->sk_state != IUCV_LISTEN) || 1863 sk_acceptq_is_full(sk) || 1864 !nsk) { 1865 /* error on server socket - connection refused */ 1866 afiucv_swap_src_dest(skb); 1867 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1868 err = dev_queue_xmit(skb); 1869 iucv_sock_kill(nsk); 1870 bh_unlock_sock(sk); 1871 goto out; 1872 } 1873 1874 niucv = iucv_sk(nsk); 1875 iucv_sock_init(nsk, sk); 1876 niucv->transport = AF_IUCV_TRANS_HIPER; 1877 niucv->msglimit = iucv->msglimit; 1878 if (!trans_hdr->window) 1879 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; 1880 else 1881 niucv->msglimit_peer = trans_hdr->window; 1882 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); 1883 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); 1884 memcpy(niucv->src_name, iucv->src_name, 8); 1885 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1886 nsk->sk_bound_dev_if = sk->sk_bound_dev_if; 1887 niucv->hs_dev = iucv->hs_dev; 1888 dev_hold(niucv->hs_dev); 1889 afiucv_swap_src_dest(skb); 1890 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; 1891 trans_hdr->window = niucv->msglimit; 1892 /* if receiver acks the xmit connection is established */ 1893 err = dev_queue_xmit(skb); 1894 if (!err) { 1895 iucv_accept_enqueue(sk, nsk); 1896 nsk->sk_state = IUCV_CONNECTED; 1897 sk->sk_data_ready(sk); 1898 } else 1899 iucv_sock_kill(nsk); 1900 bh_unlock_sock(sk); 1901 1902 out: 1903 return NET_RX_SUCCESS; 1904 } 1905 1906 /* 1907 * afiucv_hs_callback_synack() - react on received SYN-ACK 1908 */ 1909 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) 1910 { 1911 struct iucv_sock *iucv = iucv_sk(sk); 1912 1913 if (!iucv || sk->sk_state != IUCV_BOUND) { 1914 kfree_skb(skb); 1915 return NET_RX_SUCCESS; 1916 } 1917 1918 bh_lock_sock(sk); 1919 iucv->msglimit_peer = iucv_trans_hdr(skb)->window; 1920 sk->sk_state = IUCV_CONNECTED; 1921 sk->sk_state_change(sk); 1922 bh_unlock_sock(sk); 1923 consume_skb(skb); 1924 return NET_RX_SUCCESS; 1925 } 1926 1927 /* 1928 * afiucv_hs_callback_synfin() - react on received SYN_FIN 1929 */ 1930 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) 1931 { 1932 struct iucv_sock *iucv = iucv_sk(sk); 1933 1934 if (!iucv || sk->sk_state != IUCV_BOUND) { 1935 kfree_skb(skb); 1936 return NET_RX_SUCCESS; 1937 } 1938 1939 bh_lock_sock(sk); 1940 sk->sk_state = IUCV_DISCONN; 1941 sk->sk_state_change(sk); 1942 bh_unlock_sock(sk); 1943 consume_skb(skb); 1944 return NET_RX_SUCCESS; 1945 } 1946 1947 /* 1948 * afiucv_hs_callback_fin() - react on received FIN 1949 */ 1950 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) 1951 { 1952 struct iucv_sock *iucv = iucv_sk(sk); 1953 1954 /* other end of connection closed */ 1955 if (!iucv) { 1956 kfree_skb(skb); 1957 return NET_RX_SUCCESS; 1958 } 1959 1960 bh_lock_sock(sk); 1961 if (sk->sk_state == IUCV_CONNECTED) { 1962 sk->sk_state = IUCV_DISCONN; 1963 sk->sk_state_change(sk); 1964 } 1965 bh_unlock_sock(sk); 1966 consume_skb(skb); 1967 return NET_RX_SUCCESS; 1968 } 1969 1970 /* 1971 * afiucv_hs_callback_win() - react on received WIN 1972 */ 1973 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) 1974 { 1975 struct iucv_sock *iucv = iucv_sk(sk); 1976 1977 if (!iucv) 1978 return NET_RX_SUCCESS; 1979 1980 if (sk->sk_state != IUCV_CONNECTED) 1981 return NET_RX_SUCCESS; 1982 1983 atomic_sub(iucv_trans_hdr(skb)->window, &iucv->msg_sent); 1984 iucv_sock_wake_msglim(sk); 1985 return NET_RX_SUCCESS; 1986 } 1987 1988 /* 1989 * afiucv_hs_callback_rx() - react on received data 1990 */ 1991 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) 1992 { 1993 struct iucv_sock *iucv = iucv_sk(sk); 1994 1995 if (!iucv) { 1996 kfree_skb(skb); 1997 return NET_RX_SUCCESS; 1998 } 1999 2000 if (sk->sk_state != IUCV_CONNECTED) { 2001 kfree_skb(skb); 2002 return NET_RX_SUCCESS; 2003 } 2004 2005 if (sk->sk_shutdown & RCV_SHUTDOWN) { 2006 kfree_skb(skb); 2007 return NET_RX_SUCCESS; 2008 } 2009 2010 /* write stuff from iucv_msg to skb cb */ 2011 skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); 2012 skb_reset_transport_header(skb); 2013 skb_reset_network_header(skb); 2014 IUCV_SKB_CB(skb)->offset = 0; 2015 if (sk_filter(sk, skb)) { 2016 sk_drops_inc(sk); /* skb rejected by filter */ 2017 kfree_skb(skb); 2018 return NET_RX_SUCCESS; 2019 } 2020 2021 spin_lock(&iucv->message_q.lock); 2022 if (skb_queue_empty(&iucv->backlog_skb_q)) { 2023 if (__sock_queue_rcv_skb(sk, skb)) 2024 /* handle rcv queue full */ 2025 skb_queue_tail(&iucv->backlog_skb_q, skb); 2026 } else 2027 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 2028 spin_unlock(&iucv->message_q.lock); 2029 return NET_RX_SUCCESS; 2030 } 2031 2032 /* 2033 * afiucv_hs_rcv() - base function for arriving data through HiperSockets 2034 * transport 2035 * called from netif RX softirq 2036 */ 2037 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 2038 struct packet_type *pt, struct net_device *orig_dev) 2039 { 2040 struct sock *sk; 2041 struct iucv_sock *iucv; 2042 struct af_iucv_trans_hdr *trans_hdr; 2043 int err = NET_RX_SUCCESS; 2044 char nullstring[8]; 2045 2046 if (!pskb_may_pull(skb, sizeof(*trans_hdr))) { 2047 kfree_skb(skb); 2048 return NET_RX_SUCCESS; 2049 } 2050 2051 trans_hdr = iucv_trans_hdr(skb); 2052 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 2053 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 2054 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 2055 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 2056 memset(nullstring, 0, sizeof(nullstring)); 2057 iucv = NULL; 2058 sk = NULL; 2059 read_lock(&iucv_sk_list.lock); 2060 sk_for_each(sk, &iucv_sk_list.head) { 2061 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { 2062 if ((!memcmp(&iucv_sk(sk)->src_name, 2063 trans_hdr->destAppName, 8)) && 2064 (!memcmp(&iucv_sk(sk)->src_user_id, 2065 trans_hdr->destUserID, 8)) && 2066 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && 2067 (!memcmp(&iucv_sk(sk)->dst_user_id, 2068 nullstring, 8))) { 2069 iucv = iucv_sk(sk); 2070 break; 2071 } 2072 } else { 2073 if ((!memcmp(&iucv_sk(sk)->src_name, 2074 trans_hdr->destAppName, 8)) && 2075 (!memcmp(&iucv_sk(sk)->src_user_id, 2076 trans_hdr->destUserID, 8)) && 2077 (!memcmp(&iucv_sk(sk)->dst_name, 2078 trans_hdr->srcAppName, 8)) && 2079 (!memcmp(&iucv_sk(sk)->dst_user_id, 2080 trans_hdr->srcUserID, 8))) { 2081 iucv = iucv_sk(sk); 2082 break; 2083 } 2084 } 2085 } 2086 read_unlock(&iucv_sk_list.lock); 2087 if (!iucv) 2088 sk = NULL; 2089 2090 /* no sock 2091 how should we send with no sock 2092 1) send without sock no send rc checking? 2093 2) introduce default sock to handle this cases 2094 2095 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case 2096 data -> send FIN 2097 SYN|ACK, SYN|FIN, FIN -> no action? */ 2098 2099 switch (trans_hdr->flags) { 2100 case AF_IUCV_FLAG_SYN: 2101 /* connect request */ 2102 err = afiucv_hs_callback_syn(sk, skb); 2103 break; 2104 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): 2105 /* connect request confirmed */ 2106 err = afiucv_hs_callback_synack(sk, skb); 2107 break; 2108 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): 2109 /* connect request refused */ 2110 err = afiucv_hs_callback_synfin(sk, skb); 2111 break; 2112 case (AF_IUCV_FLAG_FIN): 2113 /* close request */ 2114 err = afiucv_hs_callback_fin(sk, skb); 2115 break; 2116 case (AF_IUCV_FLAG_WIN): 2117 err = afiucv_hs_callback_win(sk, skb); 2118 if (skb->len == sizeof(struct af_iucv_trans_hdr)) { 2119 consume_skb(skb); 2120 break; 2121 } 2122 fallthrough; /* and receive non-zero length data */ 2123 case (AF_IUCV_FLAG_SHT): 2124 /* shutdown request */ 2125 fallthrough; /* and receive zero length data */ 2126 case 0: 2127 /* plain data frame */ 2128 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class; 2129 err = afiucv_hs_callback_rx(sk, skb); 2130 break; 2131 default: 2132 kfree_skb(skb); 2133 } 2134 2135 return err; 2136 } 2137 2138 /* 2139 * afiucv_hs_callback_txnotify() - handle send notifications from HiperSockets 2140 * transport 2141 */ 2142 static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify n) 2143 { 2144 struct iucv_sock *iucv = iucv_sk(sk); 2145 2146 if (sock_flag(sk, SOCK_ZAPPED)) 2147 return; 2148 2149 switch (n) { 2150 case TX_NOTIFY_OK: 2151 atomic_dec(&iucv->skbs_in_xmit); 2152 iucv_sock_wake_msglim(sk); 2153 break; 2154 case TX_NOTIFY_PENDING: 2155 atomic_inc(&iucv->pendings); 2156 break; 2157 case TX_NOTIFY_DELAYED_OK: 2158 atomic_dec(&iucv->skbs_in_xmit); 2159 if (atomic_dec_return(&iucv->pendings) <= 0) 2160 iucv_sock_wake_msglim(sk); 2161 break; 2162 default: 2163 atomic_dec(&iucv->skbs_in_xmit); 2164 if (sk->sk_state == IUCV_CONNECTED) { 2165 sk->sk_state = IUCV_DISCONN; 2166 sk->sk_state_change(sk); 2167 } 2168 } 2169 2170 if (sk->sk_state == IUCV_CLOSING) { 2171 if (atomic_read(&iucv->skbs_in_xmit) == 0) { 2172 sk->sk_state = IUCV_CLOSED; 2173 sk->sk_state_change(sk); 2174 } 2175 } 2176 } 2177 2178 /* 2179 * afiucv_netdev_event: handle netdev notifier chain events 2180 */ 2181 static int afiucv_netdev_event(struct notifier_block *this, 2182 unsigned long event, void *ptr) 2183 { 2184 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 2185 struct sock *sk; 2186 struct iucv_sock *iucv; 2187 2188 switch (event) { 2189 case NETDEV_REBOOT: 2190 case NETDEV_GOING_DOWN: 2191 sk_for_each(sk, &iucv_sk_list.head) { 2192 iucv = iucv_sk(sk); 2193 if ((iucv->hs_dev == event_dev) && 2194 (sk->sk_state == IUCV_CONNECTED)) { 2195 if (event == NETDEV_GOING_DOWN) 2196 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 2197 sk->sk_state = IUCV_DISCONN; 2198 sk->sk_state_change(sk); 2199 } 2200 } 2201 break; 2202 case NETDEV_DOWN: 2203 case NETDEV_UNREGISTER: 2204 default: 2205 break; 2206 } 2207 return NOTIFY_DONE; 2208 } 2209 2210 static struct notifier_block afiucv_netdev_notifier = { 2211 .notifier_call = afiucv_netdev_event, 2212 }; 2213 2214 static const struct proto_ops iucv_sock_ops = { 2215 .family = PF_IUCV, 2216 .owner = THIS_MODULE, 2217 .release = iucv_sock_release, 2218 .bind = iucv_sock_bind, 2219 .connect = iucv_sock_connect, 2220 .listen = iucv_sock_listen, 2221 .accept = iucv_sock_accept, 2222 .getname = iucv_sock_getname, 2223 .sendmsg = iucv_sock_sendmsg, 2224 .recvmsg = iucv_sock_recvmsg, 2225 .poll = iucv_sock_poll, 2226 .ioctl = sock_no_ioctl, 2227 .mmap = sock_no_mmap, 2228 .socketpair = sock_no_socketpair, 2229 .shutdown = iucv_sock_shutdown, 2230 .setsockopt = iucv_sock_setsockopt, 2231 .getsockopt = iucv_sock_getsockopt, 2232 }; 2233 2234 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, 2235 int kern) 2236 { 2237 struct sock *sk; 2238 2239 if (protocol && protocol != PF_IUCV) 2240 return -EPROTONOSUPPORT; 2241 2242 sock->state = SS_UNCONNECTED; 2243 2244 switch (sock->type) { 2245 case SOCK_STREAM: 2246 case SOCK_SEQPACKET: 2247 /* currently, proto ops can handle both sk types */ 2248 sock->ops = &iucv_sock_ops; 2249 break; 2250 default: 2251 return -ESOCKTNOSUPPORT; 2252 } 2253 2254 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern); 2255 if (!sk) 2256 return -ENOMEM; 2257 2258 iucv_sock_init(sk, NULL); 2259 2260 return 0; 2261 } 2262 2263 static const struct net_proto_family iucv_sock_family_ops = { 2264 .family = AF_IUCV, 2265 .owner = THIS_MODULE, 2266 .create = iucv_sock_create, 2267 }; 2268 2269 static struct packet_type iucv_packet_type = { 2270 .type = cpu_to_be16(ETH_P_AF_IUCV), 2271 .func = afiucv_hs_rcv, 2272 }; 2273 2274 static int __init afiucv_init(void) 2275 { 2276 int err; 2277 2278 if (machine_is_vm() && IS_ENABLED(CONFIG_IUCV)) { 2279 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); 2280 if (unlikely(err)) { 2281 WARN_ON(err); 2282 err = -EPROTONOSUPPORT; 2283 goto out; 2284 } 2285 2286 pr_iucv = &iucv_if; 2287 } else { 2288 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2289 pr_iucv = NULL; 2290 } 2291 2292 err = proto_register(&iucv_proto, 0); 2293 if (err) 2294 goto out; 2295 err = sock_register(&iucv_sock_family_ops); 2296 if (err) 2297 goto out_proto; 2298 2299 if (pr_iucv) { 2300 err = pr_iucv->iucv_register(&af_iucv_handler, 0); 2301 if (err) 2302 goto out_sock; 2303 } 2304 2305 err = register_netdevice_notifier(&afiucv_netdev_notifier); 2306 if (err) 2307 goto out_notifier; 2308 2309 dev_add_pack(&iucv_packet_type); 2310 return 0; 2311 2312 out_notifier: 2313 if (pr_iucv) 2314 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2315 out_sock: 2316 sock_unregister(PF_IUCV); 2317 out_proto: 2318 proto_unregister(&iucv_proto); 2319 out: 2320 return err; 2321 } 2322 2323 static void __exit afiucv_exit(void) 2324 { 2325 if (pr_iucv) 2326 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2327 2328 unregister_netdevice_notifier(&afiucv_netdev_notifier); 2329 dev_remove_pack(&iucv_packet_type); 2330 sock_unregister(PF_IUCV); 2331 proto_unregister(&iucv_proto); 2332 } 2333 2334 module_init(afiucv_init); 2335 module_exit(afiucv_exit); 2336 2337 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); 2338 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); 2339 MODULE_VERSION(VERSION); 2340 MODULE_LICENSE("GPL"); 2341 MODULE_ALIAS_NETPROTO(PF_IUCV); 2342