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 <linux/uio.h> 30 #include <net/sock.h> 31 #include <asm/machine.h> 32 #include <asm/ebcdic.h> 33 #include <asm/cpcmd.h> 34 #include <linux/kmod.h> 35 36 #include <net/iucv/af_iucv.h> 37 38 #define VERSION "1.2" 39 40 static char iucv_userid[80]; 41 42 static struct proto iucv_proto = { 43 .name = "AF_IUCV", 44 .owner = THIS_MODULE, 45 .obj_size = sizeof(struct iucv_sock), 46 }; 47 48 static struct iucv_interface *pr_iucv; 49 static struct iucv_handler af_iucv_handler; 50 51 /* special AF_IUCV IPRM messages */ 52 static const u8 iprm_shutdown[8] = 53 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; 54 55 #define TRGCLS_SIZE sizeof_field(struct iucv_message, class) 56 57 #define __iucv_sock_wait(sk, condition, timeo, ret) \ 58 do { \ 59 DEFINE_WAIT(__wait); \ 60 long __timeo = timeo; \ 61 ret = 0; \ 62 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ 63 while (!(condition)) { \ 64 if (!__timeo) { \ 65 ret = -EAGAIN; \ 66 break; \ 67 } \ 68 if (signal_pending(current)) { \ 69 ret = sock_intr_errno(__timeo); \ 70 break; \ 71 } \ 72 release_sock(sk); \ 73 __timeo = schedule_timeout(__timeo); \ 74 lock_sock(sk); \ 75 ret = sock_error(sk); \ 76 if (ret) \ 77 break; \ 78 } \ 79 finish_wait(sk_sleep(sk), &__wait); \ 80 } while (0) 81 82 #define iucv_sock_wait(sk, condition, timeo) \ 83 ({ \ 84 int __ret = 0; \ 85 if (!(condition)) \ 86 __iucv_sock_wait(sk, condition, timeo, __ret); \ 87 __ret; \ 88 }) 89 90 static struct sock *iucv_accept_dequeue(struct sock *parent, 91 struct socket *newsock); 92 static void iucv_sock_kill(struct sock *sk); 93 static void iucv_sock_close(struct sock *sk); 94 95 static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify); 96 97 static struct iucv_sock_list iucv_sk_list = { 98 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), 99 .autobind_name = ATOMIC_INIT(0) 100 }; 101 102 static inline void high_nmcpy(unsigned char *dst, char *src) 103 { 104 memcpy(dst, src, 8); 105 } 106 107 static inline void low_nmcpy(unsigned char *dst, char *src) 108 { 109 memcpy(&dst[8], src, 8); 110 } 111 112 /** 113 * iucv_msg_length() - Returns the length of an iucv message. 114 * @msg: Pointer to struct iucv_message, MUST NOT be NULL 115 * 116 * The function returns the length of the specified iucv message @msg of data 117 * stored in a buffer and of data stored in the parameter list (PRMDATA). 118 * 119 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket 120 * data: 121 * PRMDATA[0..6] socket data (max 7 bytes); 122 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) 123 * 124 * The socket data length is computed by subtracting the socket data length 125 * value from 0xFF. 126 * If the socket data len is greater 7, then PRMDATA can be used for special 127 * notifications (see iucv_sock_shutdown); and further, 128 * if the socket data len is > 7, the function returns 8. 129 * 130 * Use this function to allocate socket buffers to store iucv message data. 131 * 132 * Returns: Length of the IUCV message. 133 */ 134 static inline size_t iucv_msg_length(struct iucv_message *msg) 135 { 136 size_t datalen; 137 138 if (msg->flags & IUCV_IPRMDATA) { 139 datalen = 0xff - msg->rmmsg[7]; 140 return (datalen < 8) ? datalen : 8; 141 } 142 return msg->length; 143 } 144 145 /** 146 * iucv_sock_in_state() - check for specific states 147 * @sk: sock structure 148 * @state: first iucv sk state 149 * @state2: second iucv sk state 150 * 151 * Returns: true if the socket is either in the first or second state. 152 */ 153 static int iucv_sock_in_state(struct sock *sk, int state, int state2) 154 { 155 return (sk->sk_state == state || sk->sk_state == state2); 156 } 157 158 /** 159 * iucv_below_msglim() - function to check if messages can be sent 160 * @sk: sock structure 161 * 162 * Returns: true, if either the socket is not connected (no iucv path for 163 * checking the message limit) or if the send queue length is lower 164 * than the message limit. 165 */ 166 static inline int iucv_below_msglim(struct sock *sk) 167 { 168 struct iucv_sock *iucv = iucv_sk(sk); 169 170 if (sk->sk_state != IUCV_CONNECTED) 171 return 1; 172 if (iucv->transport == AF_IUCV_TRANS_IUCV) 173 return (atomic_read(&iucv->skbs_in_xmit) < iucv->path->msglim); 174 else 175 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && 176 (atomic_read(&iucv->pendings) <= 0)); 177 } 178 179 /* 180 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit 181 */ 182 static void iucv_sock_wake_msglim(struct sock *sk) 183 { 184 struct socket_wq *wq; 185 186 rcu_read_lock(); 187 wq = rcu_dereference(sk->sk_wq); 188 if (skwq_has_sleeper(wq)) 189 wake_up_interruptible_all(&wq->wait); 190 sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT); 191 rcu_read_unlock(); 192 } 193 194 /* 195 * afiucv_hs_send() - send a message through HiperSockets transport 196 */ 197 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 198 struct sk_buff *skb, u8 flags) 199 { 200 struct iucv_sock *iucv = iucv_sk(sock); 201 struct af_iucv_trans_hdr *phs_hdr; 202 int err, confirm_recv = 0; 203 204 phs_hdr = skb_push(skb, sizeof(*phs_hdr)); 205 memset(phs_hdr, 0, sizeof(*phs_hdr)); 206 skb_reset_network_header(skb); 207 208 phs_hdr->magic = ETH_P_AF_IUCV; 209 phs_hdr->version = 1; 210 phs_hdr->flags = flags; 211 if (flags == AF_IUCV_FLAG_SYN) 212 phs_hdr->window = iucv->msglimit; 213 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { 214 confirm_recv = atomic_read(&iucv->msg_recv); 215 phs_hdr->window = confirm_recv; 216 if (confirm_recv) 217 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; 218 } 219 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); 220 memcpy(phs_hdr->destAppName, iucv->dst_name, 8); 221 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); 222 memcpy(phs_hdr->srcAppName, iucv->src_name, 8); 223 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); 224 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); 225 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); 226 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); 227 if (imsg) 228 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); 229 230 skb->dev = iucv->hs_dev; 231 if (!skb->dev) { 232 err = -ENODEV; 233 goto err_free; 234 } 235 236 dev_hard_header(skb, skb->dev, ETH_P_AF_IUCV, NULL, NULL, skb->len); 237 238 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) { 239 err = -ENETDOWN; 240 goto err_free; 241 } 242 if (skb->len > skb->dev->mtu) { 243 if (sock->sk_type == SOCK_SEQPACKET) { 244 err = -EMSGSIZE; 245 goto err_free; 246 } 247 err = pskb_trim(skb, skb->dev->mtu); 248 if (err) 249 goto err_free; 250 } 251 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV); 252 253 atomic_inc(&iucv->skbs_in_xmit); 254 err = dev_queue_xmit(skb); 255 if (net_xmit_eval(err)) { 256 atomic_dec(&iucv->skbs_in_xmit); 257 } else { 258 atomic_sub(confirm_recv, &iucv->msg_recv); 259 WARN_ON(atomic_read(&iucv->msg_recv) < 0); 260 } 261 return net_xmit_eval(err); 262 263 err_free: 264 kfree_skb(skb); 265 return err; 266 } 267 268 static struct sock *__iucv_get_sock_by_name(char *nm) 269 { 270 struct sock *sk; 271 272 sk_for_each(sk, &iucv_sk_list.head) 273 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) 274 return sk; 275 276 return NULL; 277 } 278 279 static void iucv_sock_destruct(struct sock *sk) 280 { 281 skb_queue_purge(&sk->sk_receive_queue); 282 skb_queue_purge(&sk->sk_error_queue); 283 284 if (!sock_flag(sk, SOCK_DEAD)) { 285 pr_err("Attempt to release alive iucv socket %p\n", sk); 286 return; 287 } 288 289 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 290 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 291 WARN_ON(sk->sk_wmem_queued); 292 WARN_ON(sk->sk_forward_alloc); 293 } 294 295 /* Cleanup Listen */ 296 static void iucv_sock_cleanup_listen(struct sock *parent) 297 { 298 struct sock *sk; 299 300 /* Close non-accepted connections */ 301 while ((sk = iucv_accept_dequeue(parent, NULL))) { 302 iucv_sock_close(sk); 303 iucv_sock_kill(sk); 304 } 305 306 parent->sk_state = IUCV_CLOSED; 307 } 308 309 static void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) 310 { 311 write_lock_bh(&l->lock); 312 sk_add_node(sk, &l->head); 313 write_unlock_bh(&l->lock); 314 } 315 316 static void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) 317 { 318 write_lock_bh(&l->lock); 319 sk_del_node_init(sk); 320 write_unlock_bh(&l->lock); 321 } 322 323 /* Kill socket (only if zapped and orphaned) */ 324 static void iucv_sock_kill(struct sock *sk) 325 { 326 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) 327 return; 328 329 iucv_sock_unlink(&iucv_sk_list, sk); 330 sock_set_flag(sk, SOCK_DEAD); 331 sock_put(sk); 332 } 333 334 /* Terminate an IUCV path */ 335 static void iucv_sever_path(struct sock *sk, int with_user_data) 336 { 337 unsigned char user_data[16]; 338 struct iucv_sock *iucv = iucv_sk(sk); 339 struct iucv_path *path = iucv->path; 340 341 /* Whoever resets the path pointer, must sever and free it. */ 342 if (xchg(&iucv->path, NULL)) { 343 if (with_user_data) { 344 low_nmcpy(user_data, iucv->src_name); 345 high_nmcpy(user_data, iucv->dst_name); 346 ASCEBC(user_data, sizeof(user_data)); 347 pr_iucv->path_sever(path, user_data); 348 } else 349 pr_iucv->path_sever(path, NULL); 350 iucv_path_free(path); 351 } 352 } 353 354 /* Send controlling flags through an IUCV socket for HIPER transport */ 355 static int iucv_send_ctrl(struct sock *sk, u8 flags) 356 { 357 struct iucv_sock *iucv = iucv_sk(sk); 358 int err = 0; 359 int blen; 360 struct sk_buff *skb; 361 u8 shutdown = 0; 362 363 blen = sizeof(struct af_iucv_trans_hdr) + 364 LL_RESERVED_SPACE(iucv->hs_dev); 365 if (sk->sk_shutdown & SEND_SHUTDOWN) { 366 /* controlling flags should be sent anyway */ 367 shutdown = sk->sk_shutdown; 368 sk->sk_shutdown &= RCV_SHUTDOWN; 369 } 370 skb = sock_alloc_send_skb(sk, blen, 1, &err); 371 if (skb) { 372 skb_reserve(skb, blen); 373 err = afiucv_hs_send(NULL, sk, skb, flags); 374 } 375 if (shutdown) 376 sk->sk_shutdown = shutdown; 377 return err; 378 } 379 380 /* Close an IUCV socket */ 381 static void iucv_sock_close(struct sock *sk) 382 { 383 struct iucv_sock *iucv = iucv_sk(sk); 384 unsigned long timeo; 385 int err = 0; 386 387 lock_sock(sk); 388 389 switch (sk->sk_state) { 390 case IUCV_LISTEN: 391 iucv_sock_cleanup_listen(sk); 392 break; 393 394 case IUCV_CONNECTED: 395 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 396 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 397 sk->sk_state = IUCV_DISCONN; 398 sk->sk_state_change(sk); 399 } 400 fallthrough; 401 402 case IUCV_DISCONN: 403 sk->sk_state = IUCV_CLOSING; 404 sk->sk_state_change(sk); 405 406 if (!err && atomic_read(&iucv->skbs_in_xmit) > 0) { 407 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) 408 timeo = sk->sk_lingertime; 409 else 410 timeo = IUCV_DISCONN_TIMEOUT; 411 iucv_sock_wait(sk, 412 iucv_sock_in_state(sk, IUCV_CLOSED, 0), 413 timeo); 414 } 415 fallthrough; 416 417 case IUCV_CLOSING: 418 sk->sk_state = IUCV_CLOSED; 419 sk->sk_state_change(sk); 420 421 sk->sk_err = ECONNRESET; 422 sk->sk_state_change(sk); 423 424 skb_queue_purge(&iucv->send_skb_q); 425 skb_queue_purge(&iucv->backlog_skb_q); 426 fallthrough; 427 428 default: 429 iucv_sever_path(sk, 1); 430 } 431 432 if (iucv->hs_dev) { 433 dev_put(iucv->hs_dev); 434 iucv->hs_dev = NULL; 435 sk->sk_bound_dev_if = 0; 436 } 437 438 /* mark socket for deletion by iucv_sock_kill() */ 439 sock_set_flag(sk, SOCK_ZAPPED); 440 441 release_sock(sk); 442 } 443 444 static void iucv_sock_init(struct sock *sk, struct sock *parent) 445 { 446 if (parent) { 447 sk->sk_type = parent->sk_type; 448 security_sk_clone(parent, sk); 449 } 450 } 451 452 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern) 453 { 454 struct sock *sk; 455 struct iucv_sock *iucv; 456 457 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern); 458 if (!sk) 459 return NULL; 460 iucv = iucv_sk(sk); 461 462 sock_init_data(sock, sk); 463 INIT_LIST_HEAD(&iucv->accept_q); 464 spin_lock_init(&iucv->accept_q_lock); 465 skb_queue_head_init(&iucv->send_skb_q); 466 INIT_LIST_HEAD(&iucv->message_q.list); 467 spin_lock_init(&iucv->message_q.lock); 468 skb_queue_head_init(&iucv->backlog_skb_q); 469 iucv->send_tag = 0; 470 atomic_set(&iucv->pendings, 0); 471 iucv->flags = 0; 472 iucv->msglimit = 0; 473 atomic_set(&iucv->skbs_in_xmit, 0); 474 atomic_set(&iucv->msg_sent, 0); 475 atomic_set(&iucv->msg_recv, 0); 476 iucv->path = NULL; 477 iucv->sk_txnotify = afiucv_hs_callback_txnotify; 478 memset(&iucv->init, 0, sizeof(iucv->init)); 479 if (pr_iucv) 480 iucv->transport = AF_IUCV_TRANS_IUCV; 481 else 482 iucv->transport = AF_IUCV_TRANS_HIPER; 483 484 sk->sk_destruct = iucv_sock_destruct; 485 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; 486 487 sock_reset_flag(sk, SOCK_ZAPPED); 488 489 sk->sk_protocol = proto; 490 sk->sk_state = IUCV_OPEN; 491 492 iucv_sock_link(&iucv_sk_list, sk); 493 return sk; 494 } 495 496 static void iucv_accept_enqueue(struct sock *parent, struct sock *sk) 497 { 498 unsigned long flags; 499 struct iucv_sock *par = iucv_sk(parent); 500 501 sock_hold(sk); 502 spin_lock_irqsave(&par->accept_q_lock, flags); 503 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); 504 spin_unlock_irqrestore(&par->accept_q_lock, flags); 505 iucv_sk(sk)->parent = parent; 506 sk_acceptq_added(parent); 507 } 508 509 static void iucv_accept_unlink(struct sock *sk) 510 { 511 unsigned long flags; 512 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); 513 514 spin_lock_irqsave(&par->accept_q_lock, flags); 515 list_del_init(&iucv_sk(sk)->accept_q); 516 spin_unlock_irqrestore(&par->accept_q_lock, flags); 517 sk_acceptq_removed(iucv_sk(sk)->parent); 518 iucv_sk(sk)->parent = NULL; 519 sock_put(sk); 520 } 521 522 static struct sock *iucv_accept_dequeue(struct sock *parent, 523 struct socket *newsock) 524 { 525 struct iucv_sock *isk, *n; 526 struct sock *sk; 527 528 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 529 sk = (struct sock *) isk; 530 lock_sock(sk); 531 532 if (sk->sk_state == IUCV_CLOSED) { 533 iucv_accept_unlink(sk); 534 release_sock(sk); 535 continue; 536 } 537 538 if (sk->sk_state == IUCV_CONNECTED || 539 sk->sk_state == IUCV_DISCONN || 540 !newsock) { 541 iucv_accept_unlink(sk); 542 if (newsock) 543 sock_graft(sk, newsock); 544 545 release_sock(sk); 546 return sk; 547 } 548 549 release_sock(sk); 550 } 551 return NULL; 552 } 553 554 static void __iucv_auto_name(struct iucv_sock *iucv) 555 { 556 char name[12]; 557 558 scnprintf(name, sizeof(name), 559 "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); 560 while (__iucv_get_sock_by_name(name)) { 561 scnprintf(name, sizeof(name), "%08x", 562 atomic_inc_return(&iucv_sk_list.autobind_name)); 563 } 564 memcpy(iucv->src_name, name, 8); 565 } 566 567 /* Bind an unbound socket */ 568 static int iucv_sock_bind(struct socket *sock, struct sockaddr_unsized *addr, 569 int addr_len) 570 { 571 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); 572 char uid[sizeof(sa->siucv_user_id)]; 573 struct sock *sk = sock->sk; 574 struct iucv_sock *iucv; 575 int err = 0; 576 struct net_device *dev; 577 578 /* Verify the input sockaddr */ 579 if (addr_len < sizeof(struct sockaddr_iucv) || 580 addr->sa_family != AF_IUCV) 581 return -EINVAL; 582 583 lock_sock(sk); 584 if (sk->sk_state != IUCV_OPEN) { 585 err = -EBADFD; 586 goto done; 587 } 588 589 write_lock_bh(&iucv_sk_list.lock); 590 591 iucv = iucv_sk(sk); 592 if (__iucv_get_sock_by_name(sa->siucv_name)) { 593 err = -EADDRINUSE; 594 goto done_unlock; 595 } 596 if (iucv->path) 597 goto done_unlock; 598 599 /* Bind the socket */ 600 if (pr_iucv) 601 if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) 602 goto vm_bind; /* VM IUCV transport */ 603 604 /* try hiper transport */ 605 memcpy(uid, sa->siucv_user_id, sizeof(uid)); 606 ASCEBC(uid, 8); 607 rcu_read_lock(); 608 for_each_netdev_rcu(&init_net, dev) { 609 if (!memcmp(dev->perm_addr, uid, 8)) { 610 memcpy(iucv->src_user_id, sa->siucv_user_id, 8); 611 /* Check for uninitialized siucv_name */ 612 if (strncmp(sa->siucv_name, " ", 8) == 0) 613 __iucv_auto_name(iucv); 614 else 615 memcpy(iucv->src_name, sa->siucv_name, 8); 616 sk->sk_bound_dev_if = dev->ifindex; 617 iucv->hs_dev = dev; 618 dev_hold(dev); 619 sk->sk_state = IUCV_BOUND; 620 iucv->transport = AF_IUCV_TRANS_HIPER; 621 if (!iucv->msglimit) 622 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; 623 rcu_read_unlock(); 624 goto done_unlock; 625 } 626 } 627 rcu_read_unlock(); 628 vm_bind: 629 if (pr_iucv) { 630 /* use local userid for backward compat */ 631 memcpy(iucv->src_name, sa->siucv_name, 8); 632 memcpy(iucv->src_user_id, iucv_userid, 8); 633 sk->sk_state = IUCV_BOUND; 634 iucv->transport = AF_IUCV_TRANS_IUCV; 635 sk->sk_allocation |= GFP_DMA; 636 if (!iucv->msglimit) 637 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 638 goto done_unlock; 639 } 640 /* found no dev to bind */ 641 err = -ENODEV; 642 done_unlock: 643 /* Release the socket list lock */ 644 write_unlock_bh(&iucv_sk_list.lock); 645 done: 646 release_sock(sk); 647 return err; 648 } 649 650 /* Automatically bind an unbound socket */ 651 static int iucv_sock_autobind(struct sock *sk) 652 { 653 struct iucv_sock *iucv = iucv_sk(sk); 654 int err = 0; 655 656 if (unlikely(!pr_iucv)) 657 return -EPROTO; 658 659 memcpy(iucv->src_user_id, iucv_userid, 8); 660 iucv->transport = AF_IUCV_TRANS_IUCV; 661 sk->sk_allocation |= GFP_DMA; 662 663 write_lock_bh(&iucv_sk_list.lock); 664 __iucv_auto_name(iucv); 665 write_unlock_bh(&iucv_sk_list.lock); 666 667 if (!iucv->msglimit) 668 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 669 670 return err; 671 } 672 673 static int afiucv_path_connect(struct socket *sock, struct sockaddr_unsized *addr) 674 { 675 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); 676 struct sock *sk = sock->sk; 677 struct iucv_sock *iucv = iucv_sk(sk); 678 unsigned char user_data[16]; 679 int err; 680 681 high_nmcpy(user_data, sa->siucv_name); 682 low_nmcpy(user_data, iucv->src_name); 683 ASCEBC(user_data, sizeof(user_data)); 684 685 /* Create path. */ 686 iucv->path = iucv_path_alloc(iucv->msglimit, 687 IUCV_IPRMDATA, GFP_KERNEL); 688 if (!iucv->path) { 689 err = -ENOMEM; 690 goto done; 691 } 692 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, 693 sa->siucv_user_id, NULL, user_data, 694 sk); 695 if (err) { 696 iucv_path_free(iucv->path); 697 iucv->path = NULL; 698 switch (err) { 699 case 0x0b: /* Target communicator is not logged on */ 700 err = -ENETUNREACH; 701 break; 702 case 0x0d: /* Max connections for this guest exceeded */ 703 case 0x0e: /* Max connections for target guest exceeded */ 704 err = -EAGAIN; 705 break; 706 case 0x0f: /* Missing IUCV authorization */ 707 err = -EACCES; 708 break; 709 default: 710 err = -ECONNREFUSED; 711 break; 712 } 713 } 714 done: 715 return err; 716 } 717 718 /* Connect an unconnected socket */ 719 static int iucv_sock_connect(struct socket *sock, struct sockaddr_unsized *addr, 720 int alen, int flags) 721 { 722 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); 723 struct sock *sk = sock->sk; 724 struct iucv_sock *iucv = iucv_sk(sk); 725 int err; 726 727 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV) 728 return -EINVAL; 729 730 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) 731 return -EBADFD; 732 733 if (sk->sk_state == IUCV_OPEN && 734 iucv->transport == AF_IUCV_TRANS_HIPER) 735 return -EBADFD; /* explicit bind required */ 736 737 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) 738 return -EINVAL; 739 740 if (sk->sk_state == IUCV_OPEN) { 741 err = iucv_sock_autobind(sk); 742 if (unlikely(err)) 743 return err; 744 } 745 746 lock_sock(sk); 747 748 /* Set the destination information */ 749 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); 750 memcpy(iucv->dst_name, sa->siucv_name, 8); 751 752 if (iucv->transport == AF_IUCV_TRANS_HIPER) 753 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); 754 else 755 err = afiucv_path_connect(sock, addr); 756 if (err) 757 goto done; 758 759 if (sk->sk_state != IUCV_CONNECTED) 760 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, 761 IUCV_DISCONN), 762 sock_sndtimeo(sk, flags & O_NONBLOCK)); 763 764 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) 765 err = -ECONNREFUSED; 766 767 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) 768 iucv_sever_path(sk, 0); 769 770 done: 771 release_sock(sk); 772 return err; 773 } 774 775 /* Move a socket into listening state. */ 776 static int iucv_sock_listen(struct socket *sock, int backlog) 777 { 778 struct sock *sk = sock->sk; 779 int err; 780 781 lock_sock(sk); 782 783 err = -EINVAL; 784 if (sk->sk_state != IUCV_BOUND) 785 goto done; 786 787 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) 788 goto done; 789 790 sk->sk_max_ack_backlog = backlog; 791 sk->sk_ack_backlog = 0; 792 sk->sk_state = IUCV_LISTEN; 793 err = 0; 794 795 done: 796 release_sock(sk); 797 return err; 798 } 799 800 /* Accept a pending connection */ 801 static int iucv_sock_accept(struct socket *sock, struct socket *newsock, 802 struct proto_accept_arg *arg) 803 { 804 DECLARE_WAITQUEUE(wait, current); 805 struct sock *sk = sock->sk, *nsk; 806 long timeo; 807 int err = 0; 808 809 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 810 811 if (sk->sk_state != IUCV_LISTEN) { 812 err = -EBADFD; 813 goto done; 814 } 815 816 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK); 817 818 /* Wait for an incoming connection */ 819 add_wait_queue_exclusive(sk_sleep(sk), &wait); 820 while (!(nsk = iucv_accept_dequeue(sk, newsock))) { 821 set_current_state(TASK_INTERRUPTIBLE); 822 if (!timeo) { 823 err = -EAGAIN; 824 break; 825 } 826 827 release_sock(sk); 828 timeo = schedule_timeout(timeo); 829 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 830 831 if (sk->sk_state != IUCV_LISTEN) { 832 err = -EBADFD; 833 break; 834 } 835 836 if (signal_pending(current)) { 837 err = sock_intr_errno(timeo); 838 break; 839 } 840 } 841 842 set_current_state(TASK_RUNNING); 843 remove_wait_queue(sk_sleep(sk), &wait); 844 845 if (err) 846 goto done; 847 848 newsock->state = SS_CONNECTED; 849 850 done: 851 release_sock(sk); 852 return err; 853 } 854 855 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, 856 int peer) 857 { 858 DECLARE_SOCKADDR(struct sockaddr_iucv *, siucv, addr); 859 struct sock *sk = sock->sk; 860 struct iucv_sock *iucv = iucv_sk(sk); 861 862 addr->sa_family = AF_IUCV; 863 864 if (peer) { 865 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); 866 memcpy(siucv->siucv_name, iucv->dst_name, 8); 867 } else { 868 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); 869 memcpy(siucv->siucv_name, iucv->src_name, 8); 870 } 871 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); 872 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); 873 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); 874 875 return sizeof(struct sockaddr_iucv); 876 } 877 878 /** 879 * iucv_send_iprm() - Send socket data in parameter list of an iucv message. 880 * @path: IUCV path 881 * @msg: Pointer to a struct iucv_message 882 * @skb: The socket data to send, skb->len MUST BE <= 7 883 * 884 * Send the socket data in the parameter list in the iucv message 885 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter 886 * list and the socket data len at index 7 (last byte). 887 * See also iucv_msg_length(). 888 * 889 * Returns: the return code from the iucv_message_send() call. 890 */ 891 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, 892 struct sk_buff *skb) 893 { 894 u8 prmdata[8]; 895 896 memcpy(prmdata, (void *) skb->data, skb->len); 897 prmdata[7] = 0xff - (u8) skb->len; 898 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, 899 (void *) prmdata, 8); 900 } 901 902 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg, 903 size_t len) 904 { 905 struct sock *sk = sock->sk; 906 struct iucv_sock *iucv = iucv_sk(sk); 907 size_t headroom = 0; 908 size_t linear; 909 struct sk_buff *skb; 910 struct iucv_message txmsg = {0}; 911 struct cmsghdr *cmsg; 912 int cmsg_done; 913 long timeo; 914 char user_id[9]; 915 char appl_id[9]; 916 int err; 917 int noblock = msg->msg_flags & MSG_DONTWAIT; 918 919 err = sock_error(sk); 920 if (err) 921 return err; 922 923 if (msg->msg_flags & MSG_OOB) 924 return -EOPNOTSUPP; 925 926 /* SOCK_SEQPACKET: we do not support segmented records */ 927 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) 928 return -EOPNOTSUPP; 929 930 lock_sock(sk); 931 932 if (sk->sk_shutdown & SEND_SHUTDOWN) { 933 err = -EPIPE; 934 goto out; 935 } 936 937 /* Return if the socket is not in connected state */ 938 if (sk->sk_state != IUCV_CONNECTED) { 939 err = -ENOTCONN; 940 goto out; 941 } 942 943 /* initialize defaults */ 944 cmsg_done = 0; /* check for duplicate headers */ 945 946 /* iterate over control messages */ 947 for_each_cmsghdr(cmsg, msg) { 948 if (!CMSG_OK(msg, cmsg)) { 949 err = -EINVAL; 950 goto out; 951 } 952 953 if (cmsg->cmsg_level != SOL_IUCV) 954 continue; 955 956 if (cmsg->cmsg_type & cmsg_done) { 957 err = -EINVAL; 958 goto out; 959 } 960 cmsg_done |= cmsg->cmsg_type; 961 962 switch (cmsg->cmsg_type) { 963 case SCM_IUCV_TRGCLS: 964 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { 965 err = -EINVAL; 966 goto out; 967 } 968 969 /* set iucv message target class */ 970 memcpy(&txmsg.class, 971 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); 972 973 break; 974 975 default: 976 err = -EINVAL; 977 goto out; 978 } 979 } 980 981 /* allocate one skb for each iucv message: 982 * this is fine for SOCK_SEQPACKET (unless we want to support 983 * segmented records using the MSG_EOR flag), but 984 * for SOCK_STREAM we might want to improve it in future */ 985 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 986 headroom = sizeof(struct af_iucv_trans_hdr) + 987 LL_RESERVED_SPACE(iucv->hs_dev); 988 linear = min(len, PAGE_SIZE - headroom); 989 } else { 990 if (len < PAGE_SIZE) { 991 linear = len; 992 } else { 993 /* In nonlinear "classic" iucv skb, 994 * reserve space for iucv_array 995 */ 996 headroom = sizeof(struct iucv_array) * 997 (MAX_SKB_FRAGS + 1); 998 linear = PAGE_SIZE - headroom; 999 } 1000 } 1001 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear, 1002 noblock, &err, 0); 1003 if (!skb) 1004 goto out; 1005 if (headroom) 1006 skb_reserve(skb, headroom); 1007 skb_put(skb, linear); 1008 skb->len = len; 1009 skb->data_len = len - linear; 1010 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len); 1011 if (err) 1012 goto fail; 1013 1014 /* wait if outstanding messages for iucv path has reached */ 1015 timeo = sock_sndtimeo(sk, noblock); 1016 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); 1017 if (err) 1018 goto fail; 1019 1020 /* return -ECONNRESET if the socket is no longer connected */ 1021 if (sk->sk_state != IUCV_CONNECTED) { 1022 err = -ECONNRESET; 1023 goto fail; 1024 } 1025 1026 /* increment and save iucv message tag for msg_completion cbk */ 1027 txmsg.tag = iucv->send_tag++; 1028 IUCV_SKB_CB(skb)->tag = txmsg.tag; 1029 1030 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1031 atomic_inc(&iucv->msg_sent); 1032 err = afiucv_hs_send(&txmsg, sk, skb, 0); 1033 if (err) { 1034 atomic_dec(&iucv->msg_sent); 1035 goto out; 1036 } 1037 } else { /* Classic VM IUCV transport */ 1038 skb_queue_tail(&iucv->send_skb_q, skb); 1039 atomic_inc(&iucv->skbs_in_xmit); 1040 1041 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) && 1042 skb->len <= 7) { 1043 err = iucv_send_iprm(iucv->path, &txmsg, skb); 1044 1045 /* on success: there is no message_complete callback */ 1046 /* for an IPRMDATA msg; remove skb from send queue */ 1047 if (err == 0) { 1048 atomic_dec(&iucv->skbs_in_xmit); 1049 skb_unlink(skb, &iucv->send_skb_q); 1050 consume_skb(skb); 1051 } 1052 1053 /* this error should never happen since the */ 1054 /* IUCV_IPRMDATA path flag is set... sever path */ 1055 if (err == 0x15) { 1056 pr_iucv->path_sever(iucv->path, NULL); 1057 atomic_dec(&iucv->skbs_in_xmit); 1058 skb_unlink(skb, &iucv->send_skb_q); 1059 err = -EPIPE; 1060 goto fail; 1061 } 1062 } else if (skb_is_nonlinear(skb)) { 1063 struct iucv_array *iba = (struct iucv_array *)skb->head; 1064 int i; 1065 1066 /* skip iucv_array lying in the headroom */ 1067 iba[0].address = virt_to_dma32(skb->data); 1068 iba[0].length = (u32)skb_headlen(skb); 1069 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1070 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1071 1072 iba[i + 1].address = virt_to_dma32(skb_frag_address(frag)); 1073 iba[i + 1].length = (u32)skb_frag_size(frag); 1074 } 1075 err = pr_iucv->message_send(iucv->path, &txmsg, 1076 IUCV_IPBUFLST, 0, 1077 (void *)iba, skb->len); 1078 } else { /* non-IPRM Linear skb */ 1079 err = pr_iucv->message_send(iucv->path, &txmsg, 1080 0, 0, (void *)skb->data, skb->len); 1081 } 1082 if (err) { 1083 if (err == 3) { 1084 user_id[8] = 0; 1085 memcpy(user_id, iucv->dst_user_id, 8); 1086 appl_id[8] = 0; 1087 memcpy(appl_id, iucv->dst_name, 8); 1088 pr_err( 1089 "Application %s on z/VM guest %s exceeds message limit\n", 1090 appl_id, user_id); 1091 err = -EAGAIN; 1092 } else { 1093 err = -EPIPE; 1094 } 1095 1096 atomic_dec(&iucv->skbs_in_xmit); 1097 skb_unlink(skb, &iucv->send_skb_q); 1098 goto fail; 1099 } 1100 } 1101 1102 release_sock(sk); 1103 return len; 1104 1105 fail: 1106 kfree_skb(skb); 1107 out: 1108 release_sock(sk); 1109 return err; 1110 } 1111 1112 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len) 1113 { 1114 size_t headroom, linear; 1115 struct sk_buff *skb; 1116 int err; 1117 1118 if (len < PAGE_SIZE) { 1119 headroom = 0; 1120 linear = len; 1121 } else { 1122 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1); 1123 linear = PAGE_SIZE - headroom; 1124 } 1125 skb = alloc_skb_with_frags(headroom + linear, len - linear, 1126 0, &err, GFP_ATOMIC | GFP_DMA); 1127 WARN_ONCE(!skb, 1128 "alloc of recv iucv skb len=%lu failed with errcode=%d\n", 1129 len, err); 1130 if (skb) { 1131 if (headroom) 1132 skb_reserve(skb, headroom); 1133 skb_put(skb, linear); 1134 skb->len = len; 1135 skb->data_len = len - linear; 1136 } 1137 return skb; 1138 } 1139 1140 /* iucv_process_message() - Receive a single outstanding IUCV message 1141 * 1142 * Locking: must be called with message_q.lock held 1143 */ 1144 static void iucv_process_message(struct sock *sk, struct sk_buff *skb, 1145 struct iucv_path *path, 1146 struct iucv_message *msg) 1147 { 1148 int rc; 1149 unsigned int len; 1150 1151 len = iucv_msg_length(msg); 1152 1153 /* store msg target class in the second 4 bytes of skb ctrl buffer */ 1154 /* Note: the first 4 bytes are reserved for msg tag */ 1155 IUCV_SKB_CB(skb)->class = msg->class; 1156 1157 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ 1158 if ((msg->flags & IUCV_IPRMDATA) && len > 7) { 1159 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { 1160 skb->data = NULL; 1161 skb->len = 0; 1162 } 1163 } else { 1164 if (skb_is_nonlinear(skb)) { 1165 struct iucv_array *iba = (struct iucv_array *)skb->head; 1166 int i; 1167 1168 iba[0].address = virt_to_dma32(skb->data); 1169 iba[0].length = (u32)skb_headlen(skb); 1170 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1171 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1172 1173 iba[i + 1].address = virt_to_dma32(skb_frag_address(frag)); 1174 iba[i + 1].length = (u32)skb_frag_size(frag); 1175 } 1176 rc = pr_iucv->message_receive(path, msg, 1177 IUCV_IPBUFLST, 1178 (void *)iba, len, NULL); 1179 } else { 1180 rc = pr_iucv->message_receive(path, msg, 1181 msg->flags & IUCV_IPRMDATA, 1182 skb->data, len, NULL); 1183 } 1184 if (rc) { 1185 kfree_skb(skb); 1186 return; 1187 } 1188 WARN_ON_ONCE(skb->len != len); 1189 } 1190 1191 IUCV_SKB_CB(skb)->offset = 0; 1192 if (sk_filter(sk, skb)) { 1193 sk_drops_inc(sk); /* skb rejected by filter */ 1194 kfree_skb(skb); 1195 return; 1196 } 1197 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */ 1198 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 1199 } 1200 1201 /* iucv_process_message_q() - Process outstanding IUCV messages 1202 * 1203 * Locking: must be called with message_q.lock held 1204 */ 1205 static void iucv_process_message_q(struct sock *sk) 1206 { 1207 struct iucv_sock *iucv = iucv_sk(sk); 1208 struct sk_buff *skb; 1209 struct sock_msg_q *p, *n; 1210 1211 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 1212 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg)); 1213 if (!skb) 1214 break; 1215 iucv_process_message(sk, skb, p->path, &p->msg); 1216 list_del(&p->list); 1217 kfree(p); 1218 if (!skb_queue_empty(&iucv->backlog_skb_q)) 1219 break; 1220 } 1221 } 1222 1223 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg, 1224 size_t len, int flags) 1225 { 1226 struct sock *sk = sock->sk; 1227 struct iucv_sock *iucv = iucv_sk(sk); 1228 unsigned int copied, rlen; 1229 struct sk_buff *skb, *rskb, *cskb; 1230 int err = 0; 1231 u32 offset; 1232 1233 if ((sk->sk_state == IUCV_DISCONN) && 1234 skb_queue_empty(&iucv->backlog_skb_q) && 1235 skb_queue_empty(&sk->sk_receive_queue) && 1236 list_empty(&iucv->message_q.list)) 1237 return 0; 1238 1239 if (flags & (MSG_OOB)) 1240 return -EOPNOTSUPP; 1241 1242 /* receive/dequeue next skb: 1243 * the function understands MSG_PEEK and, thus, does not dequeue skb 1244 * only refcount is increased. 1245 */ 1246 skb = skb_recv_datagram(sk, flags, &err); 1247 if (!skb) { 1248 if (sk->sk_shutdown & RCV_SHUTDOWN) 1249 return 0; 1250 return err; 1251 } 1252 1253 offset = IUCV_SKB_CB(skb)->offset; 1254 rlen = skb->len - offset; /* real length of skb */ 1255 copied = min_t(unsigned int, rlen, len); 1256 if (!rlen) 1257 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; 1258 1259 cskb = skb; 1260 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) { 1261 err = -EFAULT; 1262 goto err_out; 1263 } 1264 1265 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ 1266 if (sk->sk_type == SOCK_SEQPACKET) { 1267 if (copied < rlen) 1268 msg->msg_flags |= MSG_TRUNC; 1269 /* each iucv message contains a complete record */ 1270 msg->msg_flags |= MSG_EOR; 1271 } 1272 1273 /* create control message to store iucv msg target class: 1274 * get the trgcls from the control buffer of the skb due to 1275 * fragmentation of original iucv message. */ 1276 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, 1277 sizeof(IUCV_SKB_CB(skb)->class), 1278 (void *)&IUCV_SKB_CB(skb)->class); 1279 if (err) 1280 goto err_out; 1281 1282 /* Mark read part of skb as used */ 1283 if (!(flags & MSG_PEEK)) { 1284 1285 /* SOCK_STREAM: re-queue skb if it contains unreceived data */ 1286 if (sk->sk_type == SOCK_STREAM) { 1287 if (copied < rlen) { 1288 IUCV_SKB_CB(skb)->offset = offset + copied; 1289 skb_queue_head(&sk->sk_receive_queue, skb); 1290 goto done; 1291 } 1292 } 1293 1294 consume_skb(skb); 1295 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1296 atomic_inc(&iucv->msg_recv); 1297 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { 1298 WARN_ON(1); 1299 iucv_sock_close(sk); 1300 return -EFAULT; 1301 } 1302 } 1303 1304 /* Queue backlog skbs */ 1305 spin_lock_bh(&iucv->message_q.lock); 1306 rskb = skb_dequeue(&iucv->backlog_skb_q); 1307 while (rskb) { 1308 IUCV_SKB_CB(rskb)->offset = 0; 1309 if (__sock_queue_rcv_skb(sk, rskb)) { 1310 /* handle rcv queue full */ 1311 skb_queue_head(&iucv->backlog_skb_q, 1312 rskb); 1313 break; 1314 } 1315 rskb = skb_dequeue(&iucv->backlog_skb_q); 1316 } 1317 if (skb_queue_empty(&iucv->backlog_skb_q)) { 1318 if (!list_empty(&iucv->message_q.list)) 1319 iucv_process_message_q(sk); 1320 if (atomic_read(&iucv->msg_recv) >= 1321 iucv->msglimit / 2) { 1322 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); 1323 if (err) { 1324 sk->sk_state = IUCV_DISCONN; 1325 sk->sk_state_change(sk); 1326 } 1327 } 1328 } 1329 spin_unlock_bh(&iucv->message_q.lock); 1330 } 1331 1332 done: 1333 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ 1334 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) 1335 copied = rlen; 1336 if (flags & MSG_PEEK) 1337 skb_unref(skb); 1338 1339 return copied; 1340 1341 err_out: 1342 if (!(flags & MSG_PEEK)) 1343 skb_queue_head(&sk->sk_receive_queue, skb); 1344 else 1345 skb_unref(skb); 1346 1347 return err; 1348 } 1349 1350 static inline __poll_t iucv_accept_poll(struct sock *parent) 1351 { 1352 struct iucv_sock *isk, *n; 1353 struct sock *sk; 1354 1355 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 1356 sk = (struct sock *) isk; 1357 1358 if (sk->sk_state == IUCV_CONNECTED) 1359 return EPOLLIN | EPOLLRDNORM; 1360 } 1361 1362 return 0; 1363 } 1364 1365 static __poll_t iucv_sock_poll(struct file *file, struct socket *sock, 1366 poll_table *wait) 1367 { 1368 struct sock *sk = sock->sk; 1369 __poll_t mask = 0; 1370 1371 sock_poll_wait(file, sock, wait); 1372 1373 if (sk->sk_state == IUCV_LISTEN) 1374 return iucv_accept_poll(sk); 1375 1376 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) 1377 mask |= EPOLLERR | 1378 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0); 1379 1380 if (sk->sk_shutdown & RCV_SHUTDOWN) 1381 mask |= EPOLLRDHUP; 1382 1383 if (sk->sk_shutdown == SHUTDOWN_MASK) 1384 mask |= EPOLLHUP; 1385 1386 if (!skb_queue_empty(&sk->sk_receive_queue) || 1387 (sk->sk_shutdown & RCV_SHUTDOWN)) 1388 mask |= EPOLLIN | EPOLLRDNORM; 1389 1390 if (sk->sk_state == IUCV_CLOSED) 1391 mask |= EPOLLHUP; 1392 1393 if (sk->sk_state == IUCV_DISCONN) 1394 mask |= EPOLLIN; 1395 1396 if (sock_writeable(sk) && iucv_below_msglim(sk)) 1397 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; 1398 else 1399 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 1400 1401 return mask; 1402 } 1403 1404 static int iucv_sock_shutdown(struct socket *sock, int how) 1405 { 1406 struct sock *sk = sock->sk; 1407 struct iucv_sock *iucv = iucv_sk(sk); 1408 struct iucv_message txmsg; 1409 int err = 0; 1410 1411 how++; 1412 1413 if ((how & ~SHUTDOWN_MASK) || !how) 1414 return -EINVAL; 1415 1416 lock_sock(sk); 1417 switch (sk->sk_state) { 1418 case IUCV_LISTEN: 1419 case IUCV_DISCONN: 1420 case IUCV_CLOSING: 1421 case IUCV_CLOSED: 1422 err = -ENOTCONN; 1423 goto fail; 1424 default: 1425 break; 1426 } 1427 1428 if ((how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) && 1429 sk->sk_state == IUCV_CONNECTED) { 1430 if (iucv->transport == AF_IUCV_TRANS_IUCV) { 1431 txmsg.class = 0; 1432 txmsg.tag = 0; 1433 err = pr_iucv->message_send(iucv->path, &txmsg, 1434 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); 1435 if (err) { 1436 switch (err) { 1437 case 1: 1438 err = -ENOTCONN; 1439 break; 1440 case 2: 1441 err = -ECONNRESET; 1442 break; 1443 default: 1444 err = -ENOTCONN; 1445 break; 1446 } 1447 } 1448 } else 1449 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); 1450 } 1451 1452 sk->sk_shutdown |= how; 1453 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { 1454 if ((iucv->transport == AF_IUCV_TRANS_IUCV) && 1455 iucv->path) { 1456 err = pr_iucv->path_quiesce(iucv->path, NULL); 1457 if (err) 1458 err = -ENOTCONN; 1459 /* skb_queue_purge(&sk->sk_receive_queue); */ 1460 } 1461 skb_queue_purge(&sk->sk_receive_queue); 1462 } 1463 1464 /* Wake up anyone sleeping in poll */ 1465 sk->sk_state_change(sk); 1466 1467 fail: 1468 release_sock(sk); 1469 return err; 1470 } 1471 1472 static int iucv_sock_release(struct socket *sock) 1473 { 1474 struct sock *sk = sock->sk; 1475 int err = 0; 1476 1477 if (!sk) 1478 return 0; 1479 1480 iucv_sock_close(sk); 1481 1482 sock_orphan(sk); 1483 iucv_sock_kill(sk); 1484 return err; 1485 } 1486 1487 /* getsockopt and setsockopt */ 1488 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, 1489 sockptr_t optval, unsigned int optlen) 1490 { 1491 struct sock *sk = sock->sk; 1492 struct iucv_sock *iucv = iucv_sk(sk); 1493 int val; 1494 int rc; 1495 1496 if (level != SOL_IUCV) 1497 return -ENOPROTOOPT; 1498 1499 if (optlen < sizeof(int)) 1500 return -EINVAL; 1501 1502 if (copy_from_sockptr(&val, optval, sizeof(int))) 1503 return -EFAULT; 1504 1505 rc = 0; 1506 1507 lock_sock(sk); 1508 switch (optname) { 1509 case SO_IPRMDATA_MSG: 1510 if (val) 1511 iucv->flags |= IUCV_IPRMDATA; 1512 else 1513 iucv->flags &= ~IUCV_IPRMDATA; 1514 break; 1515 case SO_MSGLIMIT: 1516 switch (sk->sk_state) { 1517 case IUCV_OPEN: 1518 case IUCV_BOUND: 1519 if (val < 1 || val > U16_MAX) 1520 rc = -EINVAL; 1521 else 1522 iucv->msglimit = val; 1523 break; 1524 default: 1525 rc = -EINVAL; 1526 break; 1527 } 1528 break; 1529 default: 1530 rc = -ENOPROTOOPT; 1531 break; 1532 } 1533 release_sock(sk); 1534 1535 return rc; 1536 } 1537 1538 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, 1539 sockopt_t *opt) 1540 { 1541 struct sock *sk = sock->sk; 1542 struct iucv_sock *iucv = iucv_sk(sk); 1543 unsigned int val; 1544 int len, rc; 1545 1546 if (level != SOL_IUCV) 1547 return -ENOPROTOOPT; 1548 1549 len = opt->optlen; 1550 if (len < 0) 1551 return -EINVAL; 1552 1553 len = min_t(unsigned int, len, sizeof(int)); 1554 1555 rc = 0; 1556 1557 lock_sock(sk); 1558 switch (optname) { 1559 case SO_IPRMDATA_MSG: 1560 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; 1561 break; 1562 case SO_MSGLIMIT: 1563 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ 1564 : iucv->msglimit; /* default */ 1565 break; 1566 case SO_MSGSIZE: 1567 if (sk->sk_state == IUCV_OPEN) { 1568 rc = -EBADFD; 1569 break; 1570 } 1571 val = (iucv->hs_dev) ? iucv->hs_dev->mtu - 1572 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : 1573 0x7fffffff; 1574 break; 1575 default: 1576 rc = -ENOPROTOOPT; 1577 break; 1578 } 1579 release_sock(sk); 1580 1581 if (rc) 1582 return rc; 1583 1584 opt->optlen = len; 1585 if (copy_to_iter(&val, len, &opt->iter_out) != len) 1586 return -EFAULT; 1587 1588 return 0; 1589 } 1590 1591 1592 /* Callback wrappers - called from iucv base support */ 1593 static int iucv_callback_connreq(struct iucv_path *path, 1594 u8 ipvmid[8], u8 ipuser[16]) 1595 { 1596 unsigned char user_data[16]; 1597 unsigned char nuser_data[16]; 1598 unsigned char src_name[8]; 1599 struct sock *sk, *nsk; 1600 struct iucv_sock *iucv, *niucv; 1601 int err; 1602 1603 memcpy(src_name, ipuser, 8); 1604 EBCASC(src_name, 8); 1605 /* Find out if this path belongs to af_iucv. */ 1606 read_lock(&iucv_sk_list.lock); 1607 iucv = NULL; 1608 sk = NULL; 1609 sk_for_each(sk, &iucv_sk_list.head) 1610 if (sk->sk_state == IUCV_LISTEN && 1611 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { 1612 /* 1613 * Found a listening socket with 1614 * src_name == ipuser[0-7]. 1615 */ 1616 iucv = iucv_sk(sk); 1617 break; 1618 } 1619 read_unlock(&iucv_sk_list.lock); 1620 if (!iucv) 1621 /* No socket found, not one of our paths. */ 1622 return -EINVAL; 1623 1624 bh_lock_sock(sk); 1625 1626 /* Check if parent socket is listening */ 1627 low_nmcpy(user_data, iucv->src_name); 1628 high_nmcpy(user_data, iucv->dst_name); 1629 ASCEBC(user_data, sizeof(user_data)); 1630 if (sk->sk_state != IUCV_LISTEN) { 1631 err = pr_iucv->path_sever(path, user_data); 1632 iucv_path_free(path); 1633 goto fail; 1634 } 1635 1636 /* Check for backlog size */ 1637 if (sk_acceptq_is_full(sk)) { 1638 err = pr_iucv->path_sever(path, user_data); 1639 iucv_path_free(path); 1640 goto fail; 1641 } 1642 1643 /* Create the new socket */ 1644 nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0); 1645 if (!nsk) { 1646 err = pr_iucv->path_sever(path, user_data); 1647 iucv_path_free(path); 1648 goto fail; 1649 } 1650 1651 niucv = iucv_sk(nsk); 1652 iucv_sock_init(nsk, sk); 1653 niucv->transport = AF_IUCV_TRANS_IUCV; 1654 nsk->sk_allocation |= GFP_DMA; 1655 1656 /* Set the new iucv_sock */ 1657 memcpy(niucv->dst_name, ipuser + 8, 8); 1658 EBCASC(niucv->dst_name, 8); 1659 memcpy(niucv->dst_user_id, ipvmid, 8); 1660 memcpy(niucv->src_name, iucv->src_name, 8); 1661 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1662 niucv->path = path; 1663 1664 /* Call iucv_accept */ 1665 high_nmcpy(nuser_data, ipuser + 8); 1666 memcpy(nuser_data + 8, niucv->src_name, 8); 1667 ASCEBC(nuser_data + 8, 8); 1668 1669 /* set message limit for path based on msglimit of accepting socket */ 1670 niucv->msglimit = iucv->msglimit; 1671 path->msglim = iucv->msglimit; 1672 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); 1673 if (err) { 1674 iucv_sever_path(nsk, 1); 1675 iucv_sock_kill(nsk); 1676 goto fail; 1677 } 1678 1679 iucv_accept_enqueue(sk, nsk); 1680 1681 /* Wake up accept */ 1682 nsk->sk_state = IUCV_CONNECTED; 1683 sk->sk_data_ready(sk); 1684 err = 0; 1685 fail: 1686 bh_unlock_sock(sk); 1687 return 0; 1688 } 1689 1690 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) 1691 { 1692 struct sock *sk = path->private; 1693 1694 sk->sk_state = IUCV_CONNECTED; 1695 sk->sk_state_change(sk); 1696 } 1697 1698 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) 1699 { 1700 struct sock *sk = path->private; 1701 struct iucv_sock *iucv = iucv_sk(sk); 1702 struct sk_buff *skb; 1703 struct sock_msg_q *save_msg; 1704 int len; 1705 1706 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1707 pr_iucv->message_reject(path, msg); 1708 return; 1709 } 1710 1711 spin_lock(&iucv->message_q.lock); 1712 1713 if (!list_empty(&iucv->message_q.list) || 1714 !skb_queue_empty(&iucv->backlog_skb_q)) 1715 goto save_message; 1716 1717 len = atomic_read(&sk->sk_rmem_alloc); 1718 len += SKB_TRUESIZE(iucv_msg_length(msg)); 1719 if (len > sk->sk_rcvbuf) 1720 goto save_message; 1721 1722 skb = alloc_iucv_recv_skb(iucv_msg_length(msg)); 1723 if (!skb) 1724 goto save_message; 1725 1726 iucv_process_message(sk, skb, path, msg); 1727 goto out_unlock; 1728 1729 save_message: 1730 save_msg = kzalloc_obj(struct sock_msg_q, GFP_ATOMIC | GFP_DMA); 1731 if (!save_msg) 1732 goto out_unlock; 1733 save_msg->path = path; 1734 save_msg->msg = *msg; 1735 1736 list_add_tail(&save_msg->list, &iucv->message_q.list); 1737 1738 out_unlock: 1739 spin_unlock(&iucv->message_q.lock); 1740 } 1741 1742 static void iucv_callback_txdone(struct iucv_path *path, 1743 struct iucv_message *msg) 1744 { 1745 struct sock *sk = path->private; 1746 struct sk_buff *this = NULL; 1747 struct sk_buff_head *list; 1748 struct sk_buff *list_skb; 1749 struct iucv_sock *iucv; 1750 unsigned long flags; 1751 1752 iucv = iucv_sk(sk); 1753 list = &iucv->send_skb_q; 1754 1755 bh_lock_sock(sk); 1756 1757 spin_lock_irqsave(&list->lock, flags); 1758 skb_queue_walk(list, list_skb) { 1759 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { 1760 this = list_skb; 1761 break; 1762 } 1763 } 1764 if (this) { 1765 atomic_dec(&iucv->skbs_in_xmit); 1766 __skb_unlink(this, list); 1767 } 1768 1769 spin_unlock_irqrestore(&list->lock, flags); 1770 1771 if (this) { 1772 consume_skb(this); 1773 /* wake up any process waiting for sending */ 1774 iucv_sock_wake_msglim(sk); 1775 } 1776 1777 if (sk->sk_state == IUCV_CLOSING) { 1778 if (atomic_read(&iucv->skbs_in_xmit) == 0) { 1779 sk->sk_state = IUCV_CLOSED; 1780 sk->sk_state_change(sk); 1781 } 1782 } 1783 bh_unlock_sock(sk); 1784 1785 } 1786 1787 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) 1788 { 1789 struct sock *sk = path->private; 1790 1791 if (sk->sk_state == IUCV_CLOSED) 1792 return; 1793 1794 bh_lock_sock(sk); 1795 iucv_sever_path(sk, 1); 1796 sk->sk_state = IUCV_DISCONN; 1797 1798 sk->sk_state_change(sk); 1799 bh_unlock_sock(sk); 1800 } 1801 1802 /* called if the other communication side shuts down its RECV direction; 1803 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. 1804 */ 1805 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) 1806 { 1807 struct sock *sk = path->private; 1808 1809 bh_lock_sock(sk); 1810 if (sk->sk_state != IUCV_CLOSED) { 1811 sk->sk_shutdown |= SEND_SHUTDOWN; 1812 sk->sk_state_change(sk); 1813 } 1814 bh_unlock_sock(sk); 1815 } 1816 1817 static struct iucv_handler af_iucv_handler = { 1818 .path_pending = iucv_callback_connreq, 1819 .path_complete = iucv_callback_connack, 1820 .path_severed = iucv_callback_connrej, 1821 .message_pending = iucv_callback_rx, 1822 .message_complete = iucv_callback_txdone, 1823 .path_quiesced = iucv_callback_shutdown, 1824 }; 1825 1826 /***************** HiperSockets transport callbacks ********************/ 1827 static void afiucv_swap_src_dest(struct sk_buff *skb) 1828 { 1829 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); 1830 char tmpID[8]; 1831 char tmpName[8]; 1832 1833 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 1834 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 1835 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 1836 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 1837 memcpy(tmpID, trans_hdr->srcUserID, 8); 1838 memcpy(tmpName, trans_hdr->srcAppName, 8); 1839 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); 1840 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); 1841 memcpy(trans_hdr->destUserID, tmpID, 8); 1842 memcpy(trans_hdr->destAppName, tmpName, 8); 1843 skb_push(skb, ETH_HLEN); 1844 memset(skb->data, 0, ETH_HLEN); 1845 } 1846 1847 /* 1848 * afiucv_hs_callback_syn - react on received SYN 1849 */ 1850 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) 1851 { 1852 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); 1853 struct sock *nsk; 1854 struct iucv_sock *iucv, *niucv; 1855 int err; 1856 1857 iucv = iucv_sk(sk); 1858 if (!iucv) { 1859 /* no sock - connection refused */ 1860 afiucv_swap_src_dest(skb); 1861 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1862 err = dev_queue_xmit(skb); 1863 goto out; 1864 } 1865 1866 nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0); 1867 bh_lock_sock(sk); 1868 if ((sk->sk_state != IUCV_LISTEN) || 1869 sk_acceptq_is_full(sk) || 1870 !nsk) { 1871 /* error on server socket - connection refused */ 1872 afiucv_swap_src_dest(skb); 1873 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1874 err = dev_queue_xmit(skb); 1875 iucv_sock_kill(nsk); 1876 bh_unlock_sock(sk); 1877 goto out; 1878 } 1879 1880 niucv = iucv_sk(nsk); 1881 iucv_sock_init(nsk, sk); 1882 niucv->transport = AF_IUCV_TRANS_HIPER; 1883 niucv->msglimit = iucv->msglimit; 1884 if (!trans_hdr->window) 1885 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; 1886 else 1887 niucv->msglimit_peer = trans_hdr->window; 1888 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); 1889 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); 1890 memcpy(niucv->src_name, iucv->src_name, 8); 1891 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1892 nsk->sk_bound_dev_if = sk->sk_bound_dev_if; 1893 niucv->hs_dev = iucv->hs_dev; 1894 dev_hold(niucv->hs_dev); 1895 afiucv_swap_src_dest(skb); 1896 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; 1897 trans_hdr->window = niucv->msglimit; 1898 /* if receiver acks the xmit connection is established */ 1899 err = dev_queue_xmit(skb); 1900 if (!err) { 1901 iucv_accept_enqueue(sk, nsk); 1902 nsk->sk_state = IUCV_CONNECTED; 1903 sk->sk_data_ready(sk); 1904 } else 1905 iucv_sock_kill(nsk); 1906 bh_unlock_sock(sk); 1907 1908 out: 1909 return NET_RX_SUCCESS; 1910 } 1911 1912 /* 1913 * afiucv_hs_callback_synack() - react on received SYN-ACK 1914 */ 1915 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) 1916 { 1917 struct iucv_sock *iucv = iucv_sk(sk); 1918 1919 if (!iucv || sk->sk_state != IUCV_BOUND) { 1920 kfree_skb(skb); 1921 return NET_RX_SUCCESS; 1922 } 1923 1924 bh_lock_sock(sk); 1925 iucv->msglimit_peer = iucv_trans_hdr(skb)->window; 1926 sk->sk_state = IUCV_CONNECTED; 1927 sk->sk_state_change(sk); 1928 bh_unlock_sock(sk); 1929 consume_skb(skb); 1930 return NET_RX_SUCCESS; 1931 } 1932 1933 /* 1934 * afiucv_hs_callback_synfin() - react on received SYN_FIN 1935 */ 1936 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) 1937 { 1938 struct iucv_sock *iucv = iucv_sk(sk); 1939 1940 if (!iucv || sk->sk_state != IUCV_BOUND) { 1941 kfree_skb(skb); 1942 return NET_RX_SUCCESS; 1943 } 1944 1945 bh_lock_sock(sk); 1946 sk->sk_state = IUCV_DISCONN; 1947 sk->sk_state_change(sk); 1948 bh_unlock_sock(sk); 1949 consume_skb(skb); 1950 return NET_RX_SUCCESS; 1951 } 1952 1953 /* 1954 * afiucv_hs_callback_fin() - react on received FIN 1955 */ 1956 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) 1957 { 1958 struct iucv_sock *iucv = iucv_sk(sk); 1959 1960 /* other end of connection closed */ 1961 if (!iucv) { 1962 kfree_skb(skb); 1963 return NET_RX_SUCCESS; 1964 } 1965 1966 bh_lock_sock(sk); 1967 if (sk->sk_state == IUCV_CONNECTED) { 1968 sk->sk_state = IUCV_DISCONN; 1969 sk->sk_state_change(sk); 1970 } 1971 bh_unlock_sock(sk); 1972 consume_skb(skb); 1973 return NET_RX_SUCCESS; 1974 } 1975 1976 /* 1977 * afiucv_hs_callback_win() - react on received WIN 1978 */ 1979 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) 1980 { 1981 struct iucv_sock *iucv = iucv_sk(sk); 1982 1983 if (!iucv) 1984 return NET_RX_SUCCESS; 1985 1986 if (sk->sk_state != IUCV_CONNECTED) 1987 return NET_RX_SUCCESS; 1988 1989 atomic_sub(iucv_trans_hdr(skb)->window, &iucv->msg_sent); 1990 iucv_sock_wake_msglim(sk); 1991 return NET_RX_SUCCESS; 1992 } 1993 1994 /* 1995 * afiucv_hs_callback_rx() - react on received data 1996 */ 1997 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) 1998 { 1999 struct iucv_sock *iucv = iucv_sk(sk); 2000 2001 if (!iucv) { 2002 kfree_skb(skb); 2003 return NET_RX_SUCCESS; 2004 } 2005 2006 if (sk->sk_state != IUCV_CONNECTED) { 2007 kfree_skb(skb); 2008 return NET_RX_SUCCESS; 2009 } 2010 2011 if (sk->sk_shutdown & RCV_SHUTDOWN) { 2012 kfree_skb(skb); 2013 return NET_RX_SUCCESS; 2014 } 2015 2016 /* write stuff from iucv_msg to skb cb */ 2017 skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); 2018 skb_reset_transport_header(skb); 2019 skb_reset_network_header(skb); 2020 IUCV_SKB_CB(skb)->offset = 0; 2021 if (sk_filter(sk, skb)) { 2022 sk_drops_inc(sk); /* skb rejected by filter */ 2023 kfree_skb(skb); 2024 return NET_RX_SUCCESS; 2025 } 2026 2027 spin_lock(&iucv->message_q.lock); 2028 if (skb_queue_empty(&iucv->backlog_skb_q)) { 2029 if (__sock_queue_rcv_skb(sk, skb)) 2030 /* handle rcv queue full */ 2031 skb_queue_tail(&iucv->backlog_skb_q, skb); 2032 } else 2033 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 2034 spin_unlock(&iucv->message_q.lock); 2035 return NET_RX_SUCCESS; 2036 } 2037 2038 /* 2039 * afiucv_hs_rcv() - base function for arriving data through HiperSockets 2040 * transport 2041 * called from netif RX softirq 2042 */ 2043 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 2044 struct packet_type *pt, struct net_device *orig_dev) 2045 { 2046 struct sock *sk; 2047 struct iucv_sock *iucv; 2048 struct af_iucv_trans_hdr *trans_hdr; 2049 int err = NET_RX_SUCCESS; 2050 char nullstring[8]; 2051 2052 if (!pskb_may_pull(skb, sizeof(*trans_hdr))) { 2053 kfree_skb(skb); 2054 return NET_RX_SUCCESS; 2055 } 2056 2057 trans_hdr = iucv_trans_hdr(skb); 2058 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 2059 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 2060 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 2061 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 2062 memset(nullstring, 0, sizeof(nullstring)); 2063 iucv = NULL; 2064 sk = NULL; 2065 read_lock(&iucv_sk_list.lock); 2066 sk_for_each(sk, &iucv_sk_list.head) { 2067 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { 2068 if ((!memcmp(&iucv_sk(sk)->src_name, 2069 trans_hdr->destAppName, 8)) && 2070 (!memcmp(&iucv_sk(sk)->src_user_id, 2071 trans_hdr->destUserID, 8)) && 2072 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && 2073 (!memcmp(&iucv_sk(sk)->dst_user_id, 2074 nullstring, 8))) { 2075 iucv = iucv_sk(sk); 2076 break; 2077 } 2078 } else { 2079 if ((!memcmp(&iucv_sk(sk)->src_name, 2080 trans_hdr->destAppName, 8)) && 2081 (!memcmp(&iucv_sk(sk)->src_user_id, 2082 trans_hdr->destUserID, 8)) && 2083 (!memcmp(&iucv_sk(sk)->dst_name, 2084 trans_hdr->srcAppName, 8)) && 2085 (!memcmp(&iucv_sk(sk)->dst_user_id, 2086 trans_hdr->srcUserID, 8))) { 2087 iucv = iucv_sk(sk); 2088 break; 2089 } 2090 } 2091 } 2092 read_unlock(&iucv_sk_list.lock); 2093 if (!iucv) 2094 sk = NULL; 2095 2096 /* no sock 2097 how should we send with no sock 2098 1) send without sock no send rc checking? 2099 2) introduce default sock to handle this cases 2100 2101 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case 2102 data -> send FIN 2103 SYN|ACK, SYN|FIN, FIN -> no action? */ 2104 2105 switch (trans_hdr->flags) { 2106 case AF_IUCV_FLAG_SYN: 2107 /* connect request */ 2108 err = afiucv_hs_callback_syn(sk, skb); 2109 break; 2110 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): 2111 /* connect request confirmed */ 2112 err = afiucv_hs_callback_synack(sk, skb); 2113 break; 2114 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): 2115 /* connect request refused */ 2116 err = afiucv_hs_callback_synfin(sk, skb); 2117 break; 2118 case (AF_IUCV_FLAG_FIN): 2119 /* close request */ 2120 err = afiucv_hs_callback_fin(sk, skb); 2121 break; 2122 case (AF_IUCV_FLAG_WIN): 2123 err = afiucv_hs_callback_win(sk, skb); 2124 if (skb->len == sizeof(struct af_iucv_trans_hdr)) { 2125 consume_skb(skb); 2126 break; 2127 } 2128 fallthrough; /* and receive non-zero length data */ 2129 case (AF_IUCV_FLAG_SHT): 2130 /* shutdown request */ 2131 fallthrough; /* and receive zero length data */ 2132 case 0: 2133 /* plain data frame */ 2134 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class; 2135 err = afiucv_hs_callback_rx(sk, skb); 2136 break; 2137 default: 2138 kfree_skb(skb); 2139 } 2140 2141 return err; 2142 } 2143 2144 /* 2145 * afiucv_hs_callback_txnotify() - handle send notifications from HiperSockets 2146 * transport 2147 */ 2148 static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify n) 2149 { 2150 struct iucv_sock *iucv = iucv_sk(sk); 2151 2152 if (sock_flag(sk, SOCK_ZAPPED)) 2153 return; 2154 2155 switch (n) { 2156 case TX_NOTIFY_OK: 2157 atomic_dec(&iucv->skbs_in_xmit); 2158 iucv_sock_wake_msglim(sk); 2159 break; 2160 case TX_NOTIFY_PENDING: 2161 atomic_inc(&iucv->pendings); 2162 break; 2163 case TX_NOTIFY_DELAYED_OK: 2164 atomic_dec(&iucv->skbs_in_xmit); 2165 if (atomic_dec_return(&iucv->pendings) <= 0) 2166 iucv_sock_wake_msglim(sk); 2167 break; 2168 default: 2169 atomic_dec(&iucv->skbs_in_xmit); 2170 if (sk->sk_state == IUCV_CONNECTED) { 2171 sk->sk_state = IUCV_DISCONN; 2172 sk->sk_state_change(sk); 2173 } 2174 } 2175 2176 if (sk->sk_state == IUCV_CLOSING) { 2177 if (atomic_read(&iucv->skbs_in_xmit) == 0) { 2178 sk->sk_state = IUCV_CLOSED; 2179 sk->sk_state_change(sk); 2180 } 2181 } 2182 } 2183 2184 /* 2185 * afiucv_netdev_event: handle netdev notifier chain events 2186 */ 2187 static int afiucv_netdev_event(struct notifier_block *this, 2188 unsigned long event, void *ptr) 2189 { 2190 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 2191 struct sock *sk; 2192 struct iucv_sock *iucv; 2193 2194 switch (event) { 2195 case NETDEV_REBOOT: 2196 case NETDEV_GOING_DOWN: 2197 sk_for_each(sk, &iucv_sk_list.head) { 2198 iucv = iucv_sk(sk); 2199 if ((iucv->hs_dev == event_dev) && 2200 (sk->sk_state == IUCV_CONNECTED)) { 2201 if (event == NETDEV_GOING_DOWN) 2202 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 2203 sk->sk_state = IUCV_DISCONN; 2204 sk->sk_state_change(sk); 2205 } 2206 } 2207 break; 2208 case NETDEV_DOWN: 2209 case NETDEV_UNREGISTER: 2210 default: 2211 break; 2212 } 2213 return NOTIFY_DONE; 2214 } 2215 2216 static struct notifier_block afiucv_netdev_notifier = { 2217 .notifier_call = afiucv_netdev_event, 2218 }; 2219 2220 static const struct proto_ops iucv_sock_ops = { 2221 .family = PF_IUCV, 2222 .owner = THIS_MODULE, 2223 .release = iucv_sock_release, 2224 .bind = iucv_sock_bind, 2225 .connect = iucv_sock_connect, 2226 .listen = iucv_sock_listen, 2227 .accept = iucv_sock_accept, 2228 .getname = iucv_sock_getname, 2229 .sendmsg = iucv_sock_sendmsg, 2230 .recvmsg = iucv_sock_recvmsg, 2231 .poll = iucv_sock_poll, 2232 .ioctl = sock_no_ioctl, 2233 .mmap = sock_no_mmap, 2234 .socketpair = sock_no_socketpair, 2235 .shutdown = iucv_sock_shutdown, 2236 .setsockopt = iucv_sock_setsockopt, 2237 .getsockopt_iter = iucv_sock_getsockopt, 2238 }; 2239 2240 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, 2241 int kern) 2242 { 2243 struct sock *sk; 2244 2245 if (protocol && protocol != PF_IUCV) 2246 return -EPROTONOSUPPORT; 2247 2248 sock->state = SS_UNCONNECTED; 2249 2250 switch (sock->type) { 2251 case SOCK_STREAM: 2252 case SOCK_SEQPACKET: 2253 /* currently, proto ops can handle both sk types */ 2254 sock->ops = &iucv_sock_ops; 2255 break; 2256 default: 2257 return -ESOCKTNOSUPPORT; 2258 } 2259 2260 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern); 2261 if (!sk) 2262 return -ENOMEM; 2263 2264 iucv_sock_init(sk, NULL); 2265 2266 return 0; 2267 } 2268 2269 static const struct net_proto_family iucv_sock_family_ops = { 2270 .family = AF_IUCV, 2271 .owner = THIS_MODULE, 2272 .create = iucv_sock_create, 2273 }; 2274 2275 static struct packet_type iucv_packet_type = { 2276 .type = cpu_to_be16(ETH_P_AF_IUCV), 2277 .func = afiucv_hs_rcv, 2278 }; 2279 2280 static int __init afiucv_init(void) 2281 { 2282 int err; 2283 2284 if (machine_is_vm() && IS_ENABLED(CONFIG_IUCV)) { 2285 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); 2286 if (unlikely(err)) { 2287 WARN_ON(err); 2288 err = -EPROTONOSUPPORT; 2289 goto out; 2290 } 2291 2292 pr_iucv = &iucv_if; 2293 } else { 2294 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2295 pr_iucv = NULL; 2296 } 2297 2298 err = proto_register(&iucv_proto, 0); 2299 if (err) 2300 goto out; 2301 err = sock_register(&iucv_sock_family_ops); 2302 if (err) 2303 goto out_proto; 2304 2305 if (pr_iucv) { 2306 err = pr_iucv->iucv_register(&af_iucv_handler, 0); 2307 if (err) 2308 goto out_sock; 2309 } 2310 2311 err = register_netdevice_notifier(&afiucv_netdev_notifier); 2312 if (err) 2313 goto out_notifier; 2314 2315 dev_add_pack(&iucv_packet_type); 2316 return 0; 2317 2318 out_notifier: 2319 if (pr_iucv) 2320 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2321 out_sock: 2322 sock_unregister(PF_IUCV); 2323 out_proto: 2324 proto_unregister(&iucv_proto); 2325 out: 2326 return err; 2327 } 2328 2329 static void __exit afiucv_exit(void) 2330 { 2331 if (pr_iucv) 2332 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2333 2334 unregister_netdevice_notifier(&afiucv_netdev_notifier); 2335 dev_remove_pack(&iucv_packet_type); 2336 sock_unregister(PF_IUCV); 2337 proto_unregister(&iucv_proto); 2338 } 2339 2340 module_init(afiucv_init); 2341 module_exit(afiucv_exit); 2342 2343 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); 2344 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); 2345 MODULE_VERSION(VERSION); 2346 MODULE_LICENSE("GPL"); 2347 MODULE_ALIAS_NETPROTO(PF_IUCV); 2348