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 struct sock_msg_q *p, *n; 341 342 /* Whoever resets the path pointer, must sever and free it. */ 343 if (xchg(&iucv->path, NULL)) { 344 if (with_user_data) { 345 low_nmcpy(user_data, iucv->src_name); 346 high_nmcpy(user_data, iucv->dst_name); 347 ASCEBC(user_data, sizeof(user_data)); 348 pr_iucv->path_sever(path, user_data); 349 } else 350 pr_iucv->path_sever(path, NULL); 351 iucv_path_free(path); 352 353 /* 354 * Message notifications queued on message_q still reference 355 * the now freed path; drop them, otherwise a later recvmsg() 356 * would pass the freed iucv_path to message_receive() via 357 * iucv_process_message_q(). 358 */ 359 spin_lock_bh(&iucv->message_q.lock); 360 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 361 list_del(&p->list); 362 kfree(p); 363 } 364 spin_unlock_bh(&iucv->message_q.lock); 365 } 366 } 367 368 /* Send controlling flags through an IUCV socket for HIPER transport */ 369 static int iucv_send_ctrl(struct sock *sk, u8 flags) 370 { 371 struct iucv_sock *iucv = iucv_sk(sk); 372 int err = 0; 373 int blen; 374 struct sk_buff *skb; 375 u8 shutdown = 0; 376 377 blen = sizeof(struct af_iucv_trans_hdr) + 378 LL_RESERVED_SPACE(iucv->hs_dev); 379 if (sk->sk_shutdown & SEND_SHUTDOWN) { 380 /* controlling flags should be sent anyway */ 381 shutdown = sk->sk_shutdown; 382 sk->sk_shutdown &= RCV_SHUTDOWN; 383 } 384 skb = sock_alloc_send_skb(sk, blen, 1, &err); 385 if (skb) { 386 skb_reserve(skb, blen); 387 err = afiucv_hs_send(NULL, sk, skb, flags); 388 } 389 if (shutdown) 390 sk->sk_shutdown = shutdown; 391 return err; 392 } 393 394 /* Close an IUCV socket */ 395 static void iucv_sock_close(struct sock *sk) 396 { 397 struct iucv_sock *iucv = iucv_sk(sk); 398 unsigned long timeo; 399 int err = 0; 400 401 lock_sock(sk); 402 403 switch (sk->sk_state) { 404 case IUCV_LISTEN: 405 iucv_sock_cleanup_listen(sk); 406 break; 407 408 case IUCV_CONNECTED: 409 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 410 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 411 sk->sk_state = IUCV_DISCONN; 412 sk->sk_state_change(sk); 413 } 414 fallthrough; 415 416 case IUCV_DISCONN: 417 sk->sk_state = IUCV_CLOSING; 418 sk->sk_state_change(sk); 419 420 if (!err && atomic_read(&iucv->skbs_in_xmit) > 0) { 421 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) 422 timeo = sk->sk_lingertime; 423 else 424 timeo = IUCV_DISCONN_TIMEOUT; 425 iucv_sock_wait(sk, 426 iucv_sock_in_state(sk, IUCV_CLOSED, 0), 427 timeo); 428 } 429 fallthrough; 430 431 case IUCV_CLOSING: 432 sk->sk_state = IUCV_CLOSED; 433 sk->sk_state_change(sk); 434 435 sk->sk_err = ECONNRESET; 436 sk->sk_state_change(sk); 437 438 skb_queue_purge(&iucv->send_skb_q); 439 skb_queue_purge(&iucv->backlog_skb_q); 440 fallthrough; 441 442 default: 443 iucv_sever_path(sk, 1); 444 } 445 446 if (iucv->hs_dev) { 447 dev_put(iucv->hs_dev); 448 iucv->hs_dev = NULL; 449 sk->sk_bound_dev_if = 0; 450 } 451 452 /* mark socket for deletion by iucv_sock_kill() */ 453 sock_set_flag(sk, SOCK_ZAPPED); 454 455 release_sock(sk); 456 } 457 458 static void iucv_sock_init(struct sock *sk, struct sock *parent) 459 { 460 if (parent) { 461 sk->sk_type = parent->sk_type; 462 security_sk_clone(parent, sk); 463 } 464 } 465 466 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern) 467 { 468 struct sock *sk; 469 struct iucv_sock *iucv; 470 471 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern); 472 if (!sk) 473 return NULL; 474 iucv = iucv_sk(sk); 475 476 sock_init_data(sock, sk); 477 INIT_LIST_HEAD(&iucv->accept_q); 478 spin_lock_init(&iucv->accept_q_lock); 479 skb_queue_head_init(&iucv->send_skb_q); 480 INIT_LIST_HEAD(&iucv->message_q.list); 481 spin_lock_init(&iucv->message_q.lock); 482 skb_queue_head_init(&iucv->backlog_skb_q); 483 iucv->send_tag = 0; 484 atomic_set(&iucv->pendings, 0); 485 iucv->flags = 0; 486 iucv->msglimit = 0; 487 atomic_set(&iucv->skbs_in_xmit, 0); 488 atomic_set(&iucv->msg_sent, 0); 489 atomic_set(&iucv->msg_recv, 0); 490 iucv->path = NULL; 491 iucv->sk_txnotify = afiucv_hs_callback_txnotify; 492 memset(&iucv->init, 0, sizeof(iucv->init)); 493 if (pr_iucv) 494 iucv->transport = AF_IUCV_TRANS_IUCV; 495 else 496 iucv->transport = AF_IUCV_TRANS_HIPER; 497 498 sk->sk_destruct = iucv_sock_destruct; 499 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; 500 501 sock_reset_flag(sk, SOCK_ZAPPED); 502 503 sk->sk_protocol = proto; 504 sk->sk_state = IUCV_OPEN; 505 506 iucv_sock_link(&iucv_sk_list, sk); 507 return sk; 508 } 509 510 static void iucv_accept_enqueue(struct sock *parent, struct sock *sk) 511 { 512 unsigned long flags; 513 struct iucv_sock *par = iucv_sk(parent); 514 515 sock_hold(sk); 516 spin_lock_irqsave(&par->accept_q_lock, flags); 517 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); 518 spin_unlock_irqrestore(&par->accept_q_lock, flags); 519 iucv_sk(sk)->parent = parent; 520 sk_acceptq_added(parent); 521 } 522 523 static void iucv_accept_unlink(struct sock *sk) 524 { 525 unsigned long flags; 526 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); 527 528 spin_lock_irqsave(&par->accept_q_lock, flags); 529 list_del_init(&iucv_sk(sk)->accept_q); 530 spin_unlock_irqrestore(&par->accept_q_lock, flags); 531 sk_acceptq_removed(iucv_sk(sk)->parent); 532 iucv_sk(sk)->parent = NULL; 533 sock_put(sk); 534 } 535 536 static struct sock *iucv_accept_dequeue(struct sock *parent, 537 struct socket *newsock) 538 { 539 struct iucv_sock *isk, *n; 540 struct sock *sk; 541 542 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 543 sk = (struct sock *) isk; 544 lock_sock(sk); 545 546 if (sk->sk_state == IUCV_CLOSED) { 547 iucv_accept_unlink(sk); 548 release_sock(sk); 549 continue; 550 } 551 552 if (sk->sk_state == IUCV_CONNECTED || 553 sk->sk_state == IUCV_DISCONN || 554 !newsock) { 555 iucv_accept_unlink(sk); 556 if (newsock) 557 sock_graft(sk, newsock); 558 559 release_sock(sk); 560 return sk; 561 } 562 563 release_sock(sk); 564 } 565 return NULL; 566 } 567 568 static void __iucv_auto_name(struct iucv_sock *iucv) 569 { 570 char name[12]; 571 572 scnprintf(name, sizeof(name), 573 "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); 574 while (__iucv_get_sock_by_name(name)) { 575 scnprintf(name, sizeof(name), "%08x", 576 atomic_inc_return(&iucv_sk_list.autobind_name)); 577 } 578 memcpy(iucv->src_name, name, 8); 579 } 580 581 /* Bind an unbound socket */ 582 static int iucv_sock_bind(struct socket *sock, struct sockaddr_unsized *addr, 583 int addr_len) 584 { 585 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); 586 char uid[sizeof(sa->siucv_user_id)]; 587 struct sock *sk = sock->sk; 588 struct iucv_sock *iucv; 589 int err = 0; 590 struct net_device *dev; 591 592 /* Verify the input sockaddr */ 593 if (addr_len < sizeof(struct sockaddr_iucv) || 594 addr->sa_family != AF_IUCV) 595 return -EINVAL; 596 597 lock_sock(sk); 598 if (sk->sk_state != IUCV_OPEN) { 599 err = -EBADFD; 600 goto done; 601 } 602 603 write_lock_bh(&iucv_sk_list.lock); 604 605 iucv = iucv_sk(sk); 606 if (__iucv_get_sock_by_name(sa->siucv_name)) { 607 err = -EADDRINUSE; 608 goto done_unlock; 609 } 610 if (iucv->path) 611 goto done_unlock; 612 613 /* Bind the socket */ 614 if (pr_iucv) 615 if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) 616 goto vm_bind; /* VM IUCV transport */ 617 618 /* try hiper transport */ 619 memcpy(uid, sa->siucv_user_id, sizeof(uid)); 620 ASCEBC(uid, 8); 621 rcu_read_lock(); 622 for_each_netdev_rcu(&init_net, dev) { 623 if (!memcmp(dev->perm_addr, uid, 8)) { 624 memcpy(iucv->src_user_id, sa->siucv_user_id, 8); 625 /* Check for uninitialized siucv_name */ 626 if (strncmp(sa->siucv_name, " ", 8) == 0) 627 __iucv_auto_name(iucv); 628 else 629 memcpy(iucv->src_name, sa->siucv_name, 8); 630 sk->sk_bound_dev_if = dev->ifindex; 631 iucv->hs_dev = dev; 632 dev_hold(dev); 633 sk->sk_state = IUCV_BOUND; 634 iucv->transport = AF_IUCV_TRANS_HIPER; 635 if (!iucv->msglimit) 636 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; 637 rcu_read_unlock(); 638 goto done_unlock; 639 } 640 } 641 rcu_read_unlock(); 642 vm_bind: 643 if (pr_iucv) { 644 /* use local userid for backward compat */ 645 memcpy(iucv->src_name, sa->siucv_name, 8); 646 memcpy(iucv->src_user_id, iucv_userid, 8); 647 sk->sk_state = IUCV_BOUND; 648 iucv->transport = AF_IUCV_TRANS_IUCV; 649 sk->sk_allocation |= GFP_DMA; 650 if (!iucv->msglimit) 651 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 652 goto done_unlock; 653 } 654 /* found no dev to bind */ 655 err = -ENODEV; 656 done_unlock: 657 /* Release the socket list lock */ 658 write_unlock_bh(&iucv_sk_list.lock); 659 done: 660 release_sock(sk); 661 return err; 662 } 663 664 /* Automatically bind an unbound socket */ 665 static int iucv_sock_autobind(struct sock *sk) 666 { 667 struct iucv_sock *iucv = iucv_sk(sk); 668 int err = 0; 669 670 if (unlikely(!pr_iucv)) 671 return -EPROTO; 672 673 memcpy(iucv->src_user_id, iucv_userid, 8); 674 iucv->transport = AF_IUCV_TRANS_IUCV; 675 sk->sk_allocation |= GFP_DMA; 676 677 write_lock_bh(&iucv_sk_list.lock); 678 __iucv_auto_name(iucv); 679 write_unlock_bh(&iucv_sk_list.lock); 680 681 if (!iucv->msglimit) 682 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 683 684 return err; 685 } 686 687 static int afiucv_path_connect(struct socket *sock, struct sockaddr_unsized *addr) 688 { 689 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); 690 struct sock *sk = sock->sk; 691 struct iucv_sock *iucv = iucv_sk(sk); 692 unsigned char user_data[16]; 693 int err; 694 695 high_nmcpy(user_data, sa->siucv_name); 696 low_nmcpy(user_data, iucv->src_name); 697 ASCEBC(user_data, sizeof(user_data)); 698 699 /* Create path. */ 700 iucv->path = iucv_path_alloc(iucv->msglimit, 701 IUCV_IPRMDATA, GFP_KERNEL); 702 if (!iucv->path) { 703 err = -ENOMEM; 704 goto done; 705 } 706 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, 707 sa->siucv_user_id, NULL, user_data, 708 sk); 709 if (err) { 710 iucv_path_free(iucv->path); 711 iucv->path = NULL; 712 switch (err) { 713 case 0x0b: /* Target communicator is not logged on */ 714 err = -ENETUNREACH; 715 break; 716 case 0x0d: /* Max connections for this guest exceeded */ 717 case 0x0e: /* Max connections for target guest exceeded */ 718 err = -EAGAIN; 719 break; 720 case 0x0f: /* Missing IUCV authorization */ 721 err = -EACCES; 722 break; 723 default: 724 err = -ECONNREFUSED; 725 break; 726 } 727 } 728 done: 729 return err; 730 } 731 732 /* Connect an unconnected socket */ 733 static int iucv_sock_connect(struct socket *sock, struct sockaddr_unsized *addr, 734 int alen, int flags) 735 { 736 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); 737 struct sock *sk = sock->sk; 738 struct iucv_sock *iucv = iucv_sk(sk); 739 int err; 740 741 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV) 742 return -EINVAL; 743 744 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) 745 return -EBADFD; 746 747 if (sk->sk_state == IUCV_OPEN && 748 iucv->transport == AF_IUCV_TRANS_HIPER) 749 return -EBADFD; /* explicit bind required */ 750 751 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) 752 return -EINVAL; 753 754 if (sk->sk_state == IUCV_OPEN) { 755 err = iucv_sock_autobind(sk); 756 if (unlikely(err)) 757 return err; 758 } 759 760 lock_sock(sk); 761 762 /* Set the destination information */ 763 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); 764 memcpy(iucv->dst_name, sa->siucv_name, 8); 765 766 if (iucv->transport == AF_IUCV_TRANS_HIPER) 767 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); 768 else 769 err = afiucv_path_connect(sock, addr); 770 if (err) 771 goto done; 772 773 if (sk->sk_state != IUCV_CONNECTED) 774 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, 775 IUCV_DISCONN), 776 sock_sndtimeo(sk, flags & O_NONBLOCK)); 777 778 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) 779 err = -ECONNREFUSED; 780 781 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) 782 iucv_sever_path(sk, 0); 783 784 done: 785 release_sock(sk); 786 return err; 787 } 788 789 /* Move a socket into listening state. */ 790 static int iucv_sock_listen(struct socket *sock, int backlog) 791 { 792 struct sock *sk = sock->sk; 793 int err; 794 795 lock_sock(sk); 796 797 err = -EINVAL; 798 if (sk->sk_state != IUCV_BOUND) 799 goto done; 800 801 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) 802 goto done; 803 804 sk->sk_max_ack_backlog = backlog; 805 sk->sk_ack_backlog = 0; 806 sk->sk_state = IUCV_LISTEN; 807 err = 0; 808 809 done: 810 release_sock(sk); 811 return err; 812 } 813 814 /* Accept a pending connection */ 815 static int iucv_sock_accept(struct socket *sock, struct socket *newsock, 816 struct proto_accept_arg *arg) 817 { 818 DECLARE_WAITQUEUE(wait, current); 819 struct sock *sk = sock->sk, *nsk; 820 long timeo; 821 int err = 0; 822 823 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 824 825 if (sk->sk_state != IUCV_LISTEN) { 826 err = -EBADFD; 827 goto done; 828 } 829 830 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK); 831 832 /* Wait for an incoming connection */ 833 add_wait_queue_exclusive(sk_sleep(sk), &wait); 834 while (!(nsk = iucv_accept_dequeue(sk, newsock))) { 835 set_current_state(TASK_INTERRUPTIBLE); 836 if (!timeo) { 837 err = -EAGAIN; 838 break; 839 } 840 841 release_sock(sk); 842 timeo = schedule_timeout(timeo); 843 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 844 845 if (sk->sk_state != IUCV_LISTEN) { 846 err = -EBADFD; 847 break; 848 } 849 850 if (signal_pending(current)) { 851 err = sock_intr_errno(timeo); 852 break; 853 } 854 } 855 856 set_current_state(TASK_RUNNING); 857 remove_wait_queue(sk_sleep(sk), &wait); 858 859 if (err) 860 goto done; 861 862 newsock->state = SS_CONNECTED; 863 864 done: 865 release_sock(sk); 866 return err; 867 } 868 869 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, 870 int peer) 871 { 872 DECLARE_SOCKADDR(struct sockaddr_iucv *, siucv, addr); 873 struct sock *sk = sock->sk; 874 struct iucv_sock *iucv = iucv_sk(sk); 875 876 addr->sa_family = AF_IUCV; 877 878 if (peer) { 879 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); 880 memcpy(siucv->siucv_name, iucv->dst_name, 8); 881 } else { 882 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); 883 memcpy(siucv->siucv_name, iucv->src_name, 8); 884 } 885 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); 886 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); 887 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); 888 889 return sizeof(struct sockaddr_iucv); 890 } 891 892 /** 893 * iucv_send_iprm() - Send socket data in parameter list of an iucv message. 894 * @path: IUCV path 895 * @msg: Pointer to a struct iucv_message 896 * @skb: The socket data to send, skb->len MUST BE <= 7 897 * 898 * Send the socket data in the parameter list in the iucv message 899 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter 900 * list and the socket data len at index 7 (last byte). 901 * See also iucv_msg_length(). 902 * 903 * Returns: the return code from the iucv_message_send() call. 904 */ 905 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, 906 struct sk_buff *skb) 907 { 908 u8 prmdata[8]; 909 910 memcpy(prmdata, (void *) skb->data, skb->len); 911 prmdata[7] = 0xff - (u8) skb->len; 912 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, 913 (void *) prmdata, 8); 914 } 915 916 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg, 917 size_t len) 918 { 919 struct sock *sk = sock->sk; 920 struct iucv_sock *iucv = iucv_sk(sk); 921 size_t headroom = 0; 922 size_t linear; 923 struct sk_buff *skb; 924 struct iucv_message txmsg = {0}; 925 struct cmsghdr *cmsg; 926 int cmsg_done; 927 long timeo; 928 char user_id[9]; 929 char appl_id[9]; 930 int err; 931 int noblock = msg->msg_flags & MSG_DONTWAIT; 932 933 err = sock_error(sk); 934 if (err) 935 return err; 936 937 if (msg->msg_flags & MSG_OOB) 938 return -EOPNOTSUPP; 939 940 /* SOCK_SEQPACKET: we do not support segmented records */ 941 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) 942 return -EOPNOTSUPP; 943 944 lock_sock(sk); 945 946 if (sk->sk_shutdown & SEND_SHUTDOWN) { 947 err = -EPIPE; 948 goto out; 949 } 950 951 /* Return if the socket is not in connected state */ 952 if (sk->sk_state != IUCV_CONNECTED) { 953 err = -ENOTCONN; 954 goto out; 955 } 956 957 /* initialize defaults */ 958 cmsg_done = 0; /* check for duplicate headers */ 959 960 /* iterate over control messages */ 961 for_each_cmsghdr(cmsg, msg) { 962 if (!CMSG_OK(msg, cmsg)) { 963 err = -EINVAL; 964 goto out; 965 } 966 967 if (cmsg->cmsg_level != SOL_IUCV) 968 continue; 969 970 if (cmsg->cmsg_type & cmsg_done) { 971 err = -EINVAL; 972 goto out; 973 } 974 cmsg_done |= cmsg->cmsg_type; 975 976 switch (cmsg->cmsg_type) { 977 case SCM_IUCV_TRGCLS: 978 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { 979 err = -EINVAL; 980 goto out; 981 } 982 983 /* set iucv message target class */ 984 memcpy(&txmsg.class, 985 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); 986 987 break; 988 989 default: 990 err = -EINVAL; 991 goto out; 992 } 993 } 994 995 /* allocate one skb for each iucv message: 996 * this is fine for SOCK_SEQPACKET (unless we want to support 997 * segmented records using the MSG_EOR flag), but 998 * for SOCK_STREAM we might want to improve it in future */ 999 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1000 headroom = sizeof(struct af_iucv_trans_hdr) + 1001 LL_RESERVED_SPACE(iucv->hs_dev); 1002 linear = min(len, PAGE_SIZE - headroom); 1003 } else { 1004 if (len < PAGE_SIZE) { 1005 linear = len; 1006 } else { 1007 /* In nonlinear "classic" iucv skb, 1008 * reserve space for iucv_array 1009 */ 1010 headroom = sizeof(struct iucv_array) * 1011 (MAX_SKB_FRAGS + 1); 1012 linear = PAGE_SIZE - headroom; 1013 } 1014 } 1015 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear, 1016 noblock, &err, 0); 1017 if (!skb) 1018 goto out; 1019 if (headroom) 1020 skb_reserve(skb, headroom); 1021 skb_put(skb, linear); 1022 skb->len = len; 1023 skb->data_len = len - linear; 1024 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len); 1025 if (err) 1026 goto fail; 1027 1028 /* wait if outstanding messages for iucv path has reached */ 1029 timeo = sock_sndtimeo(sk, noblock); 1030 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); 1031 if (err) 1032 goto fail; 1033 1034 /* return -ECONNRESET if the socket is no longer connected */ 1035 if (sk->sk_state != IUCV_CONNECTED) { 1036 err = -ECONNRESET; 1037 goto fail; 1038 } 1039 1040 /* increment and save iucv message tag for msg_completion cbk */ 1041 txmsg.tag = iucv->send_tag++; 1042 IUCV_SKB_CB(skb)->tag = txmsg.tag; 1043 1044 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1045 atomic_inc(&iucv->msg_sent); 1046 err = afiucv_hs_send(&txmsg, sk, skb, 0); 1047 if (err) { 1048 atomic_dec(&iucv->msg_sent); 1049 goto out; 1050 } 1051 } else { /* Classic VM IUCV transport */ 1052 skb_queue_tail(&iucv->send_skb_q, skb); 1053 atomic_inc(&iucv->skbs_in_xmit); 1054 1055 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) && 1056 skb->len <= 7) { 1057 err = iucv_send_iprm(iucv->path, &txmsg, skb); 1058 1059 /* on success: there is no message_complete callback */ 1060 /* for an IPRMDATA msg; remove skb from send queue */ 1061 if (err == 0) { 1062 atomic_dec(&iucv->skbs_in_xmit); 1063 skb_unlink(skb, &iucv->send_skb_q); 1064 consume_skb(skb); 1065 } 1066 1067 /* this error should never happen since the */ 1068 /* IUCV_IPRMDATA path flag is set... sever path */ 1069 if (err == 0x15) { 1070 pr_iucv->path_sever(iucv->path, NULL); 1071 atomic_dec(&iucv->skbs_in_xmit); 1072 skb_unlink(skb, &iucv->send_skb_q); 1073 err = -EPIPE; 1074 goto fail; 1075 } 1076 } else if (skb_is_nonlinear(skb)) { 1077 struct iucv_array *iba = (struct iucv_array *)skb->head; 1078 int i; 1079 1080 /* skip iucv_array lying in the headroom */ 1081 iba[0].address = virt_to_dma32(skb->data); 1082 iba[0].length = (u32)skb_headlen(skb); 1083 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1084 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1085 1086 iba[i + 1].address = virt_to_dma32(skb_frag_address(frag)); 1087 iba[i + 1].length = (u32)skb_frag_size(frag); 1088 } 1089 err = pr_iucv->message_send(iucv->path, &txmsg, 1090 IUCV_IPBUFLST, 0, 1091 (void *)iba, skb->len); 1092 } else { /* non-IPRM Linear skb */ 1093 err = pr_iucv->message_send(iucv->path, &txmsg, 1094 0, 0, (void *)skb->data, skb->len); 1095 } 1096 if (err) { 1097 if (err == 3) { 1098 user_id[8] = 0; 1099 memcpy(user_id, iucv->dst_user_id, 8); 1100 appl_id[8] = 0; 1101 memcpy(appl_id, iucv->dst_name, 8); 1102 pr_err( 1103 "Application %s on z/VM guest %s exceeds message limit\n", 1104 appl_id, user_id); 1105 err = -EAGAIN; 1106 } else { 1107 err = -EPIPE; 1108 } 1109 1110 atomic_dec(&iucv->skbs_in_xmit); 1111 skb_unlink(skb, &iucv->send_skb_q); 1112 goto fail; 1113 } 1114 } 1115 1116 release_sock(sk); 1117 return len; 1118 1119 fail: 1120 kfree_skb(skb); 1121 out: 1122 release_sock(sk); 1123 return err; 1124 } 1125 1126 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len) 1127 { 1128 size_t headroom, linear; 1129 struct sk_buff *skb; 1130 int err; 1131 1132 if (len < PAGE_SIZE) { 1133 headroom = 0; 1134 linear = len; 1135 } else { 1136 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1); 1137 linear = PAGE_SIZE - headroom; 1138 } 1139 skb = alloc_skb_with_frags(headroom + linear, len - linear, 1140 0, &err, GFP_ATOMIC | GFP_DMA); 1141 WARN_ONCE(!skb, 1142 "alloc of recv iucv skb len=%lu failed with errcode=%d\n", 1143 len, err); 1144 if (skb) { 1145 if (headroom) 1146 skb_reserve(skb, headroom); 1147 skb_put(skb, linear); 1148 skb->len = len; 1149 skb->data_len = len - linear; 1150 } 1151 return skb; 1152 } 1153 1154 /* iucv_process_message() - Receive a single outstanding IUCV message 1155 * 1156 * Locking: must be called with message_q.lock held 1157 */ 1158 static void iucv_process_message(struct sock *sk, struct sk_buff *skb, 1159 struct iucv_path *path, 1160 struct iucv_message *msg) 1161 { 1162 int rc; 1163 unsigned int len; 1164 1165 len = iucv_msg_length(msg); 1166 1167 /* store msg target class in the second 4 bytes of skb ctrl buffer */ 1168 /* Note: the first 4 bytes are reserved for msg tag */ 1169 IUCV_SKB_CB(skb)->class = msg->class; 1170 1171 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ 1172 if ((msg->flags & IUCV_IPRMDATA) && len > 7) { 1173 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { 1174 skb->data = NULL; 1175 skb->len = 0; 1176 } 1177 } else { 1178 if (skb_is_nonlinear(skb)) { 1179 struct iucv_array *iba = (struct iucv_array *)skb->head; 1180 int i; 1181 1182 iba[0].address = virt_to_dma32(skb->data); 1183 iba[0].length = (u32)skb_headlen(skb); 1184 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1185 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1186 1187 iba[i + 1].address = virt_to_dma32(skb_frag_address(frag)); 1188 iba[i + 1].length = (u32)skb_frag_size(frag); 1189 } 1190 rc = pr_iucv->message_receive(path, msg, 1191 IUCV_IPBUFLST, 1192 (void *)iba, len, NULL); 1193 } else { 1194 rc = pr_iucv->message_receive(path, msg, 1195 msg->flags & IUCV_IPRMDATA, 1196 skb->data, len, NULL); 1197 } 1198 if (rc) { 1199 kfree_skb(skb); 1200 return; 1201 } 1202 WARN_ON_ONCE(skb->len != len); 1203 } 1204 1205 IUCV_SKB_CB(skb)->offset = 0; 1206 if (sk_filter(sk, skb)) { 1207 sk_drops_inc(sk); /* skb rejected by filter */ 1208 kfree_skb(skb); 1209 return; 1210 } 1211 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */ 1212 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 1213 } 1214 1215 /* iucv_process_message_q() - Process outstanding IUCV messages 1216 * 1217 * Locking: must be called with message_q.lock held 1218 */ 1219 static void iucv_process_message_q(struct sock *sk) 1220 { 1221 struct iucv_sock *iucv = iucv_sk(sk); 1222 struct sk_buff *skb; 1223 struct sock_msg_q *p, *n; 1224 1225 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 1226 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg)); 1227 if (!skb) 1228 break; 1229 iucv_process_message(sk, skb, p->path, &p->msg); 1230 list_del(&p->list); 1231 kfree(p); 1232 if (!skb_queue_empty(&iucv->backlog_skb_q)) 1233 break; 1234 } 1235 } 1236 1237 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg, 1238 size_t len, int flags) 1239 { 1240 struct sock *sk = sock->sk; 1241 struct iucv_sock *iucv = iucv_sk(sk); 1242 unsigned int copied, rlen; 1243 struct sk_buff *skb, *rskb, *cskb; 1244 int err = 0; 1245 u32 offset; 1246 1247 if ((sk->sk_state == IUCV_DISCONN) && 1248 skb_queue_empty(&iucv->backlog_skb_q) && 1249 skb_queue_empty(&sk->sk_receive_queue) && 1250 list_empty(&iucv->message_q.list)) 1251 return 0; 1252 1253 if (flags & (MSG_OOB)) 1254 return -EOPNOTSUPP; 1255 1256 /* receive/dequeue next skb: 1257 * the function understands MSG_PEEK and, thus, does not dequeue skb 1258 * only refcount is increased. 1259 */ 1260 skb = skb_recv_datagram(sk, flags, &err); 1261 if (!skb) { 1262 if (sk->sk_shutdown & RCV_SHUTDOWN) 1263 return 0; 1264 return err; 1265 } 1266 1267 offset = IUCV_SKB_CB(skb)->offset; 1268 rlen = skb->len - offset; /* real length of skb */ 1269 copied = min_t(unsigned int, rlen, len); 1270 if (!rlen) 1271 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; 1272 1273 cskb = skb; 1274 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) { 1275 err = -EFAULT; 1276 goto err_out; 1277 } 1278 1279 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ 1280 if (sk->sk_type == SOCK_SEQPACKET) { 1281 if (copied < rlen) 1282 msg->msg_flags |= MSG_TRUNC; 1283 /* each iucv message contains a complete record */ 1284 msg->msg_flags |= MSG_EOR; 1285 } 1286 1287 /* create control message to store iucv msg target class: 1288 * get the trgcls from the control buffer of the skb due to 1289 * fragmentation of original iucv message. */ 1290 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, 1291 sizeof(IUCV_SKB_CB(skb)->class), 1292 (void *)&IUCV_SKB_CB(skb)->class); 1293 if (err) 1294 goto err_out; 1295 1296 /* Mark read part of skb as used */ 1297 if (!(flags & MSG_PEEK)) { 1298 1299 /* SOCK_STREAM: re-queue skb if it contains unreceived data */ 1300 if (sk->sk_type == SOCK_STREAM) { 1301 if (copied < rlen) { 1302 IUCV_SKB_CB(skb)->offset = offset + copied; 1303 skb_queue_head(&sk->sk_receive_queue, skb); 1304 goto done; 1305 } 1306 } 1307 1308 consume_skb(skb); 1309 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1310 atomic_inc(&iucv->msg_recv); 1311 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { 1312 WARN_ON(1); 1313 iucv_sock_close(sk); 1314 return -EFAULT; 1315 } 1316 } 1317 1318 /* Queue backlog skbs */ 1319 spin_lock_bh(&iucv->message_q.lock); 1320 rskb = skb_dequeue(&iucv->backlog_skb_q); 1321 while (rskb) { 1322 IUCV_SKB_CB(rskb)->offset = 0; 1323 if (__sock_queue_rcv_skb(sk, rskb)) { 1324 /* handle rcv queue full */ 1325 skb_queue_head(&iucv->backlog_skb_q, 1326 rskb); 1327 break; 1328 } 1329 rskb = skb_dequeue(&iucv->backlog_skb_q); 1330 } 1331 if (skb_queue_empty(&iucv->backlog_skb_q)) { 1332 if (!list_empty(&iucv->message_q.list)) 1333 iucv_process_message_q(sk); 1334 if (atomic_read(&iucv->msg_recv) >= 1335 iucv->msglimit / 2) { 1336 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); 1337 if (err) { 1338 sk->sk_state = IUCV_DISCONN; 1339 sk->sk_state_change(sk); 1340 } 1341 } 1342 } 1343 spin_unlock_bh(&iucv->message_q.lock); 1344 } 1345 1346 done: 1347 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ 1348 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) 1349 copied = rlen; 1350 if (flags & MSG_PEEK) 1351 skb_unref(skb); 1352 1353 return copied; 1354 1355 err_out: 1356 if (!(flags & MSG_PEEK)) 1357 skb_queue_head(&sk->sk_receive_queue, skb); 1358 else 1359 skb_unref(skb); 1360 1361 return err; 1362 } 1363 1364 static inline __poll_t iucv_accept_poll(struct sock *parent) 1365 { 1366 struct iucv_sock *isk, *n; 1367 struct sock *sk; 1368 1369 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 1370 sk = (struct sock *) isk; 1371 1372 if (sk->sk_state == IUCV_CONNECTED) 1373 return EPOLLIN | EPOLLRDNORM; 1374 } 1375 1376 return 0; 1377 } 1378 1379 static __poll_t iucv_sock_poll(struct file *file, struct socket *sock, 1380 poll_table *wait) 1381 { 1382 struct sock *sk = sock->sk; 1383 __poll_t mask = 0; 1384 1385 sock_poll_wait(file, sock, wait); 1386 1387 if (sk->sk_state == IUCV_LISTEN) 1388 return iucv_accept_poll(sk); 1389 1390 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) 1391 mask |= EPOLLERR | 1392 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0); 1393 1394 if (sk->sk_shutdown & RCV_SHUTDOWN) 1395 mask |= EPOLLRDHUP; 1396 1397 if (sk->sk_shutdown == SHUTDOWN_MASK) 1398 mask |= EPOLLHUP; 1399 1400 if (!skb_queue_empty(&sk->sk_receive_queue) || 1401 (sk->sk_shutdown & RCV_SHUTDOWN)) 1402 mask |= EPOLLIN | EPOLLRDNORM; 1403 1404 if (sk->sk_state == IUCV_CLOSED) 1405 mask |= EPOLLHUP; 1406 1407 if (sk->sk_state == IUCV_DISCONN) 1408 mask |= EPOLLIN; 1409 1410 if (sock_writeable(sk) && iucv_below_msglim(sk)) 1411 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; 1412 else 1413 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 1414 1415 return mask; 1416 } 1417 1418 static int iucv_sock_shutdown(struct socket *sock, int how) 1419 { 1420 struct sock *sk = sock->sk; 1421 struct iucv_sock *iucv = iucv_sk(sk); 1422 struct iucv_message txmsg; 1423 int err = 0; 1424 1425 how++; 1426 1427 if ((how & ~SHUTDOWN_MASK) || !how) 1428 return -EINVAL; 1429 1430 lock_sock(sk); 1431 switch (sk->sk_state) { 1432 case IUCV_LISTEN: 1433 case IUCV_DISCONN: 1434 case IUCV_CLOSING: 1435 case IUCV_CLOSED: 1436 err = -ENOTCONN; 1437 goto fail; 1438 default: 1439 break; 1440 } 1441 1442 if ((how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) && 1443 sk->sk_state == IUCV_CONNECTED) { 1444 if (iucv->transport == AF_IUCV_TRANS_IUCV) { 1445 txmsg.class = 0; 1446 txmsg.tag = 0; 1447 err = pr_iucv->message_send(iucv->path, &txmsg, 1448 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); 1449 if (err) { 1450 switch (err) { 1451 case 1: 1452 err = -ENOTCONN; 1453 break; 1454 case 2: 1455 err = -ECONNRESET; 1456 break; 1457 default: 1458 err = -ENOTCONN; 1459 break; 1460 } 1461 } 1462 } else 1463 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); 1464 } 1465 1466 sk->sk_shutdown |= how; 1467 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { 1468 if ((iucv->transport == AF_IUCV_TRANS_IUCV) && 1469 iucv->path) { 1470 err = pr_iucv->path_quiesce(iucv->path, NULL); 1471 if (err) 1472 err = -ENOTCONN; 1473 /* skb_queue_purge(&sk->sk_receive_queue); */ 1474 } 1475 skb_queue_purge(&sk->sk_receive_queue); 1476 } 1477 1478 /* Wake up anyone sleeping in poll */ 1479 sk->sk_state_change(sk); 1480 1481 fail: 1482 release_sock(sk); 1483 return err; 1484 } 1485 1486 static int iucv_sock_release(struct socket *sock) 1487 { 1488 struct sock *sk = sock->sk; 1489 int err = 0; 1490 1491 if (!sk) 1492 return 0; 1493 1494 iucv_sock_close(sk); 1495 1496 sock_orphan(sk); 1497 iucv_sock_kill(sk); 1498 return err; 1499 } 1500 1501 /* getsockopt and setsockopt */ 1502 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, 1503 sockptr_t optval, unsigned int optlen) 1504 { 1505 struct sock *sk = sock->sk; 1506 struct iucv_sock *iucv = iucv_sk(sk); 1507 int val; 1508 int rc; 1509 1510 if (level != SOL_IUCV) 1511 return -ENOPROTOOPT; 1512 1513 if (optlen < sizeof(int)) 1514 return -EINVAL; 1515 1516 if (copy_from_sockptr(&val, optval, sizeof(int))) 1517 return -EFAULT; 1518 1519 rc = 0; 1520 1521 lock_sock(sk); 1522 switch (optname) { 1523 case SO_IPRMDATA_MSG: 1524 if (val) 1525 iucv->flags |= IUCV_IPRMDATA; 1526 else 1527 iucv->flags &= ~IUCV_IPRMDATA; 1528 break; 1529 case SO_MSGLIMIT: 1530 switch (sk->sk_state) { 1531 case IUCV_OPEN: 1532 case IUCV_BOUND: 1533 if (val < 1 || val > U16_MAX) 1534 rc = -EINVAL; 1535 else 1536 iucv->msglimit = val; 1537 break; 1538 default: 1539 rc = -EINVAL; 1540 break; 1541 } 1542 break; 1543 default: 1544 rc = -ENOPROTOOPT; 1545 break; 1546 } 1547 release_sock(sk); 1548 1549 return rc; 1550 } 1551 1552 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, 1553 sockopt_t *opt) 1554 { 1555 struct sock *sk = sock->sk; 1556 struct iucv_sock *iucv = iucv_sk(sk); 1557 unsigned int val; 1558 int len, rc; 1559 1560 if (level != SOL_IUCV) 1561 return -ENOPROTOOPT; 1562 1563 len = opt->optlen; 1564 if (len < 0) 1565 return -EINVAL; 1566 1567 len = min_t(unsigned int, len, sizeof(int)); 1568 1569 rc = 0; 1570 1571 lock_sock(sk); 1572 switch (optname) { 1573 case SO_IPRMDATA_MSG: 1574 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; 1575 break; 1576 case SO_MSGLIMIT: 1577 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ 1578 : iucv->msglimit; /* default */ 1579 break; 1580 case SO_MSGSIZE: 1581 if (sk->sk_state == IUCV_OPEN) { 1582 rc = -EBADFD; 1583 break; 1584 } 1585 val = (iucv->hs_dev) ? iucv->hs_dev->mtu - 1586 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : 1587 0x7fffffff; 1588 break; 1589 default: 1590 rc = -ENOPROTOOPT; 1591 break; 1592 } 1593 release_sock(sk); 1594 1595 if (rc) 1596 return rc; 1597 1598 opt->optlen = len; 1599 if (copy_to_iter(&val, len, &opt->iter_out) != len) 1600 return -EFAULT; 1601 1602 return 0; 1603 } 1604 1605 1606 /* Callback wrappers - called from iucv base support */ 1607 static int iucv_callback_connreq(struct iucv_path *path, 1608 u8 ipvmid[8], u8 ipuser[16]) 1609 { 1610 unsigned char user_data[16]; 1611 unsigned char nuser_data[16]; 1612 unsigned char src_name[8]; 1613 struct sock *sk, *nsk; 1614 struct iucv_sock *iucv, *niucv; 1615 int err; 1616 1617 memcpy(src_name, ipuser, 8); 1618 EBCASC(src_name, 8); 1619 /* Find out if this path belongs to af_iucv. */ 1620 read_lock(&iucv_sk_list.lock); 1621 iucv = NULL; 1622 sk = NULL; 1623 sk_for_each(sk, &iucv_sk_list.head) 1624 if (sk->sk_state == IUCV_LISTEN && 1625 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { 1626 /* 1627 * Found a listening socket with 1628 * src_name == ipuser[0-7]. 1629 */ 1630 iucv = iucv_sk(sk); 1631 break; 1632 } 1633 read_unlock(&iucv_sk_list.lock); 1634 if (!iucv) 1635 /* No socket found, not one of our paths. */ 1636 return -EINVAL; 1637 1638 bh_lock_sock(sk); 1639 1640 /* Check if parent socket is listening */ 1641 low_nmcpy(user_data, iucv->src_name); 1642 high_nmcpy(user_data, iucv->dst_name); 1643 ASCEBC(user_data, sizeof(user_data)); 1644 if (sk->sk_state != IUCV_LISTEN) { 1645 err = pr_iucv->path_sever(path, user_data); 1646 iucv_path_free(path); 1647 goto fail; 1648 } 1649 1650 /* Check for backlog size */ 1651 if (sk_acceptq_is_full(sk)) { 1652 err = pr_iucv->path_sever(path, user_data); 1653 iucv_path_free(path); 1654 goto fail; 1655 } 1656 1657 /* Create the new socket */ 1658 nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0); 1659 if (!nsk) { 1660 err = pr_iucv->path_sever(path, user_data); 1661 iucv_path_free(path); 1662 goto fail; 1663 } 1664 1665 niucv = iucv_sk(nsk); 1666 iucv_sock_init(nsk, sk); 1667 niucv->transport = AF_IUCV_TRANS_IUCV; 1668 nsk->sk_allocation |= GFP_DMA; 1669 1670 /* Set the new iucv_sock */ 1671 memcpy(niucv->dst_name, ipuser + 8, 8); 1672 EBCASC(niucv->dst_name, 8); 1673 memcpy(niucv->dst_user_id, ipvmid, 8); 1674 memcpy(niucv->src_name, iucv->src_name, 8); 1675 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1676 niucv->path = path; 1677 1678 /* Call iucv_accept */ 1679 high_nmcpy(nuser_data, ipuser + 8); 1680 memcpy(nuser_data + 8, niucv->src_name, 8); 1681 ASCEBC(nuser_data + 8, 8); 1682 1683 /* set message limit for path based on msglimit of accepting socket */ 1684 niucv->msglimit = iucv->msglimit; 1685 path->msglim = iucv->msglimit; 1686 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); 1687 if (err) { 1688 iucv_sever_path(nsk, 1); 1689 iucv_sock_kill(nsk); 1690 goto fail; 1691 } 1692 1693 iucv_accept_enqueue(sk, nsk); 1694 1695 /* Wake up accept */ 1696 nsk->sk_state = IUCV_CONNECTED; 1697 sk->sk_data_ready(sk); 1698 err = 0; 1699 fail: 1700 bh_unlock_sock(sk); 1701 return 0; 1702 } 1703 1704 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) 1705 { 1706 struct sock *sk = path->private; 1707 1708 sk->sk_state = IUCV_CONNECTED; 1709 sk->sk_state_change(sk); 1710 } 1711 1712 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) 1713 { 1714 struct sock *sk = path->private; 1715 struct iucv_sock *iucv = iucv_sk(sk); 1716 struct sk_buff *skb; 1717 struct sock_msg_q *save_msg; 1718 int len; 1719 1720 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1721 pr_iucv->message_reject(path, msg); 1722 return; 1723 } 1724 1725 spin_lock(&iucv->message_q.lock); 1726 1727 if (!list_empty(&iucv->message_q.list) || 1728 !skb_queue_empty(&iucv->backlog_skb_q)) 1729 goto save_message; 1730 1731 len = atomic_read(&sk->sk_rmem_alloc); 1732 len += SKB_TRUESIZE(iucv_msg_length(msg)); 1733 if (len > sk->sk_rcvbuf) 1734 goto save_message; 1735 1736 skb = alloc_iucv_recv_skb(iucv_msg_length(msg)); 1737 if (!skb) 1738 goto save_message; 1739 1740 iucv_process_message(sk, skb, path, msg); 1741 goto out_unlock; 1742 1743 save_message: 1744 save_msg = kzalloc_obj(struct sock_msg_q, GFP_ATOMIC | GFP_DMA); 1745 if (!save_msg) 1746 goto out_unlock; 1747 save_msg->path = path; 1748 save_msg->msg = *msg; 1749 1750 list_add_tail(&save_msg->list, &iucv->message_q.list); 1751 1752 out_unlock: 1753 spin_unlock(&iucv->message_q.lock); 1754 } 1755 1756 static void iucv_callback_txdone(struct iucv_path *path, 1757 struct iucv_message *msg) 1758 { 1759 struct sock *sk = path->private; 1760 struct sk_buff *this = NULL; 1761 struct sk_buff_head *list; 1762 struct sk_buff *list_skb; 1763 struct iucv_sock *iucv; 1764 unsigned long flags; 1765 1766 iucv = iucv_sk(sk); 1767 list = &iucv->send_skb_q; 1768 1769 bh_lock_sock(sk); 1770 1771 spin_lock_irqsave(&list->lock, flags); 1772 skb_queue_walk(list, list_skb) { 1773 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { 1774 this = list_skb; 1775 break; 1776 } 1777 } 1778 if (this) { 1779 atomic_dec(&iucv->skbs_in_xmit); 1780 __skb_unlink(this, list); 1781 } 1782 1783 spin_unlock_irqrestore(&list->lock, flags); 1784 1785 if (this) { 1786 consume_skb(this); 1787 /* wake up any process waiting for sending */ 1788 iucv_sock_wake_msglim(sk); 1789 } 1790 1791 if (sk->sk_state == IUCV_CLOSING) { 1792 if (atomic_read(&iucv->skbs_in_xmit) == 0) { 1793 sk->sk_state = IUCV_CLOSED; 1794 sk->sk_state_change(sk); 1795 } 1796 } 1797 bh_unlock_sock(sk); 1798 1799 } 1800 1801 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) 1802 { 1803 struct sock *sk = path->private; 1804 1805 if (sk->sk_state == IUCV_CLOSED) 1806 return; 1807 1808 bh_lock_sock(sk); 1809 iucv_sever_path(sk, 1); 1810 sk->sk_state = IUCV_DISCONN; 1811 1812 sk->sk_state_change(sk); 1813 bh_unlock_sock(sk); 1814 } 1815 1816 /* called if the other communication side shuts down its RECV direction; 1817 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. 1818 */ 1819 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) 1820 { 1821 struct sock *sk = path->private; 1822 1823 bh_lock_sock(sk); 1824 if (sk->sk_state != IUCV_CLOSED) { 1825 sk->sk_shutdown |= SEND_SHUTDOWN; 1826 sk->sk_state_change(sk); 1827 } 1828 bh_unlock_sock(sk); 1829 } 1830 1831 static struct iucv_handler af_iucv_handler = { 1832 .path_pending = iucv_callback_connreq, 1833 .path_complete = iucv_callback_connack, 1834 .path_severed = iucv_callback_connrej, 1835 .message_pending = iucv_callback_rx, 1836 .message_complete = iucv_callback_txdone, 1837 .path_quiesced = iucv_callback_shutdown, 1838 }; 1839 1840 /***************** HiperSockets transport callbacks ********************/ 1841 static void afiucv_swap_src_dest(struct sk_buff *skb) 1842 { 1843 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); 1844 char tmpID[8]; 1845 char tmpName[8]; 1846 1847 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 1848 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 1849 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 1850 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 1851 memcpy(tmpID, trans_hdr->srcUserID, 8); 1852 memcpy(tmpName, trans_hdr->srcAppName, 8); 1853 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); 1854 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); 1855 memcpy(trans_hdr->destUserID, tmpID, 8); 1856 memcpy(trans_hdr->destAppName, tmpName, 8); 1857 skb_push(skb, ETH_HLEN); 1858 memset(skb->data, 0, ETH_HLEN); 1859 } 1860 1861 /* 1862 * afiucv_hs_callback_syn - react on received SYN 1863 */ 1864 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) 1865 { 1866 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); 1867 struct sock *nsk; 1868 struct iucv_sock *iucv, *niucv; 1869 int err; 1870 1871 iucv = iucv_sk(sk); 1872 if (!iucv) { 1873 /* no sock - connection refused */ 1874 afiucv_swap_src_dest(skb); 1875 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1876 err = dev_queue_xmit(skb); 1877 goto out; 1878 } 1879 1880 nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0); 1881 bh_lock_sock(sk); 1882 if ((sk->sk_state != IUCV_LISTEN) || 1883 sk_acceptq_is_full(sk) || 1884 !nsk) { 1885 /* error on server socket - connection refused */ 1886 afiucv_swap_src_dest(skb); 1887 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1888 err = dev_queue_xmit(skb); 1889 if (nsk) 1890 iucv_sock_kill(nsk); 1891 bh_unlock_sock(sk); 1892 goto out; 1893 } 1894 1895 niucv = iucv_sk(nsk); 1896 iucv_sock_init(nsk, sk); 1897 niucv->transport = AF_IUCV_TRANS_HIPER; 1898 niucv->msglimit = iucv->msglimit; 1899 if (!trans_hdr->window) 1900 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; 1901 else 1902 niucv->msglimit_peer = trans_hdr->window; 1903 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); 1904 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); 1905 memcpy(niucv->src_name, iucv->src_name, 8); 1906 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1907 nsk->sk_bound_dev_if = sk->sk_bound_dev_if; 1908 niucv->hs_dev = iucv->hs_dev; 1909 dev_hold(niucv->hs_dev); 1910 afiucv_swap_src_dest(skb); 1911 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; 1912 trans_hdr->window = niucv->msglimit; 1913 /* if receiver acks the xmit connection is established */ 1914 err = dev_queue_xmit(skb); 1915 if (!err) { 1916 iucv_accept_enqueue(sk, nsk); 1917 nsk->sk_state = IUCV_CONNECTED; 1918 sk->sk_data_ready(sk); 1919 } else 1920 iucv_sock_kill(nsk); 1921 bh_unlock_sock(sk); 1922 1923 out: 1924 return NET_RX_SUCCESS; 1925 } 1926 1927 /* 1928 * afiucv_hs_callback_synack() - react on received SYN-ACK 1929 */ 1930 static int afiucv_hs_callback_synack(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 iucv->msglimit_peer = iucv_trans_hdr(skb)->window; 1941 sk->sk_state = IUCV_CONNECTED; 1942 sk->sk_state_change(sk); 1943 bh_unlock_sock(sk); 1944 consume_skb(skb); 1945 return NET_RX_SUCCESS; 1946 } 1947 1948 /* 1949 * afiucv_hs_callback_synfin() - react on received SYN_FIN 1950 */ 1951 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) 1952 { 1953 struct iucv_sock *iucv = iucv_sk(sk); 1954 1955 if (!iucv || sk->sk_state != IUCV_BOUND) { 1956 kfree_skb(skb); 1957 return NET_RX_SUCCESS; 1958 } 1959 1960 bh_lock_sock(sk); 1961 sk->sk_state = IUCV_DISCONN; 1962 sk->sk_state_change(sk); 1963 bh_unlock_sock(sk); 1964 consume_skb(skb); 1965 return NET_RX_SUCCESS; 1966 } 1967 1968 /* 1969 * afiucv_hs_callback_fin() - react on received FIN 1970 */ 1971 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) 1972 { 1973 struct iucv_sock *iucv = iucv_sk(sk); 1974 1975 /* other end of connection closed */ 1976 if (!iucv) { 1977 kfree_skb(skb); 1978 return NET_RX_SUCCESS; 1979 } 1980 1981 bh_lock_sock(sk); 1982 if (sk->sk_state == IUCV_CONNECTED) { 1983 sk->sk_state = IUCV_DISCONN; 1984 sk->sk_state_change(sk); 1985 } 1986 bh_unlock_sock(sk); 1987 consume_skb(skb); 1988 return NET_RX_SUCCESS; 1989 } 1990 1991 /* 1992 * afiucv_hs_callback_win() - react on received WIN 1993 */ 1994 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) 1995 { 1996 struct iucv_sock *iucv = iucv_sk(sk); 1997 1998 if (!iucv) 1999 return NET_RX_SUCCESS; 2000 2001 if (sk->sk_state != IUCV_CONNECTED) 2002 return NET_RX_SUCCESS; 2003 2004 atomic_sub(iucv_trans_hdr(skb)->window, &iucv->msg_sent); 2005 iucv_sock_wake_msglim(sk); 2006 return NET_RX_SUCCESS; 2007 } 2008 2009 /* 2010 * afiucv_hs_callback_rx() - react on received data 2011 */ 2012 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) 2013 { 2014 struct iucv_sock *iucv = iucv_sk(sk); 2015 2016 if (!iucv) { 2017 kfree_skb(skb); 2018 return NET_RX_SUCCESS; 2019 } 2020 2021 if (sk->sk_state != IUCV_CONNECTED) { 2022 kfree_skb(skb); 2023 return NET_RX_SUCCESS; 2024 } 2025 2026 if (sk->sk_shutdown & RCV_SHUTDOWN) { 2027 kfree_skb(skb); 2028 return NET_RX_SUCCESS; 2029 } 2030 2031 /* write stuff from iucv_msg to skb cb */ 2032 skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); 2033 skb_reset_transport_header(skb); 2034 skb_reset_network_header(skb); 2035 IUCV_SKB_CB(skb)->offset = 0; 2036 if (sk_filter(sk, skb)) { 2037 sk_drops_inc(sk); /* skb rejected by filter */ 2038 kfree_skb(skb); 2039 return NET_RX_SUCCESS; 2040 } 2041 2042 spin_lock(&iucv->message_q.lock); 2043 if (skb_queue_empty(&iucv->backlog_skb_q)) { 2044 if (__sock_queue_rcv_skb(sk, skb)) 2045 /* handle rcv queue full */ 2046 skb_queue_tail(&iucv->backlog_skb_q, skb); 2047 } else 2048 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 2049 spin_unlock(&iucv->message_q.lock); 2050 return NET_RX_SUCCESS; 2051 } 2052 2053 /* 2054 * afiucv_hs_rcv() - base function for arriving data through HiperSockets 2055 * transport 2056 * called from netif RX softirq 2057 */ 2058 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 2059 struct packet_type *pt, struct net_device *orig_dev) 2060 { 2061 struct sock *sk; 2062 struct iucv_sock *iucv; 2063 struct af_iucv_trans_hdr *trans_hdr; 2064 int err = NET_RX_SUCCESS; 2065 char nullstring[8]; 2066 2067 if (!pskb_may_pull(skb, sizeof(*trans_hdr))) { 2068 kfree_skb(skb); 2069 return NET_RX_SUCCESS; 2070 } 2071 2072 trans_hdr = iucv_trans_hdr(skb); 2073 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 2074 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 2075 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 2076 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 2077 memset(nullstring, 0, sizeof(nullstring)); 2078 iucv = NULL; 2079 sk = NULL; 2080 read_lock(&iucv_sk_list.lock); 2081 sk_for_each(sk, &iucv_sk_list.head) { 2082 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { 2083 if ((!memcmp(&iucv_sk(sk)->src_name, 2084 trans_hdr->destAppName, 8)) && 2085 (!memcmp(&iucv_sk(sk)->src_user_id, 2086 trans_hdr->destUserID, 8)) && 2087 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && 2088 (!memcmp(&iucv_sk(sk)->dst_user_id, 2089 nullstring, 8))) { 2090 iucv = iucv_sk(sk); 2091 break; 2092 } 2093 } else { 2094 if ((!memcmp(&iucv_sk(sk)->src_name, 2095 trans_hdr->destAppName, 8)) && 2096 (!memcmp(&iucv_sk(sk)->src_user_id, 2097 trans_hdr->destUserID, 8)) && 2098 (!memcmp(&iucv_sk(sk)->dst_name, 2099 trans_hdr->srcAppName, 8)) && 2100 (!memcmp(&iucv_sk(sk)->dst_user_id, 2101 trans_hdr->srcUserID, 8))) { 2102 iucv = iucv_sk(sk); 2103 break; 2104 } 2105 } 2106 } 2107 if (sk) 2108 sock_hold(sk); 2109 read_unlock(&iucv_sk_list.lock); 2110 if (!iucv) 2111 sk = NULL; 2112 2113 /* no sock 2114 how should we send with no sock 2115 1) send without sock no send rc checking? 2116 2) introduce default sock to handle this cases 2117 2118 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case 2119 data -> send FIN 2120 SYN|ACK, SYN|FIN, FIN -> no action? */ 2121 2122 switch (trans_hdr->flags) { 2123 case AF_IUCV_FLAG_SYN: 2124 /* connect request */ 2125 err = afiucv_hs_callback_syn(sk, skb); 2126 break; 2127 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): 2128 /* connect request confirmed */ 2129 err = afiucv_hs_callback_synack(sk, skb); 2130 break; 2131 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): 2132 /* connect request refused */ 2133 err = afiucv_hs_callback_synfin(sk, skb); 2134 break; 2135 case (AF_IUCV_FLAG_FIN): 2136 /* close request */ 2137 err = afiucv_hs_callback_fin(sk, skb); 2138 break; 2139 case (AF_IUCV_FLAG_WIN): 2140 err = afiucv_hs_callback_win(sk, skb); 2141 if (skb->len == sizeof(struct af_iucv_trans_hdr)) { 2142 consume_skb(skb); 2143 break; 2144 } 2145 fallthrough; /* and receive non-zero length data */ 2146 case (AF_IUCV_FLAG_SHT): 2147 /* shutdown request */ 2148 fallthrough; /* and receive zero length data */ 2149 case 0: 2150 /* plain data frame */ 2151 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class; 2152 err = afiucv_hs_callback_rx(sk, skb); 2153 break; 2154 default: 2155 kfree_skb(skb); 2156 } 2157 2158 if (sk) 2159 sock_put(sk); 2160 return err; 2161 } 2162 2163 /* 2164 * afiucv_hs_callback_txnotify() - handle send notifications from HiperSockets 2165 * transport 2166 */ 2167 static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify n) 2168 { 2169 struct iucv_sock *iucv = iucv_sk(sk); 2170 2171 if (sock_flag(sk, SOCK_ZAPPED)) 2172 return; 2173 2174 switch (n) { 2175 case TX_NOTIFY_OK: 2176 atomic_dec(&iucv->skbs_in_xmit); 2177 iucv_sock_wake_msglim(sk); 2178 break; 2179 case TX_NOTIFY_PENDING: 2180 atomic_inc(&iucv->pendings); 2181 break; 2182 case TX_NOTIFY_DELAYED_OK: 2183 atomic_dec(&iucv->skbs_in_xmit); 2184 if (atomic_dec_return(&iucv->pendings) <= 0) 2185 iucv_sock_wake_msglim(sk); 2186 break; 2187 default: 2188 atomic_dec(&iucv->skbs_in_xmit); 2189 if (sk->sk_state == IUCV_CONNECTED) { 2190 sk->sk_state = IUCV_DISCONN; 2191 sk->sk_state_change(sk); 2192 } 2193 } 2194 2195 if (sk->sk_state == IUCV_CLOSING) { 2196 if (atomic_read(&iucv->skbs_in_xmit) == 0) { 2197 sk->sk_state = IUCV_CLOSED; 2198 sk->sk_state_change(sk); 2199 } 2200 } 2201 } 2202 2203 /* 2204 * afiucv_netdev_event: handle netdev notifier chain events 2205 */ 2206 static int afiucv_netdev_event(struct notifier_block *this, 2207 unsigned long event, void *ptr) 2208 { 2209 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 2210 struct sock *sk; 2211 struct iucv_sock *iucv; 2212 2213 switch (event) { 2214 case NETDEV_REBOOT: 2215 case NETDEV_GOING_DOWN: 2216 sk_for_each(sk, &iucv_sk_list.head) { 2217 iucv = iucv_sk(sk); 2218 if ((iucv->hs_dev == event_dev) && 2219 (sk->sk_state == IUCV_CONNECTED)) { 2220 if (event == NETDEV_GOING_DOWN) 2221 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 2222 sk->sk_state = IUCV_DISCONN; 2223 sk->sk_state_change(sk); 2224 } 2225 } 2226 break; 2227 case NETDEV_DOWN: 2228 case NETDEV_UNREGISTER: 2229 default: 2230 break; 2231 } 2232 return NOTIFY_DONE; 2233 } 2234 2235 static struct notifier_block afiucv_netdev_notifier = { 2236 .notifier_call = afiucv_netdev_event, 2237 }; 2238 2239 static const struct proto_ops iucv_sock_ops = { 2240 .family = PF_IUCV, 2241 .owner = THIS_MODULE, 2242 .release = iucv_sock_release, 2243 .bind = iucv_sock_bind, 2244 .connect = iucv_sock_connect, 2245 .listen = iucv_sock_listen, 2246 .accept = iucv_sock_accept, 2247 .getname = iucv_sock_getname, 2248 .sendmsg = iucv_sock_sendmsg, 2249 .recvmsg = iucv_sock_recvmsg, 2250 .poll = iucv_sock_poll, 2251 .ioctl = sock_no_ioctl, 2252 .mmap = sock_no_mmap, 2253 .socketpair = sock_no_socketpair, 2254 .shutdown = iucv_sock_shutdown, 2255 .setsockopt = iucv_sock_setsockopt, 2256 .getsockopt_iter = iucv_sock_getsockopt, 2257 }; 2258 2259 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, 2260 int kern) 2261 { 2262 struct sock *sk; 2263 2264 if (protocol && protocol != PF_IUCV) 2265 return -EPROTONOSUPPORT; 2266 2267 sock->state = SS_UNCONNECTED; 2268 2269 switch (sock->type) { 2270 case SOCK_STREAM: 2271 case SOCK_SEQPACKET: 2272 /* currently, proto ops can handle both sk types */ 2273 sock->ops = &iucv_sock_ops; 2274 break; 2275 default: 2276 return -ESOCKTNOSUPPORT; 2277 } 2278 2279 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern); 2280 if (!sk) 2281 return -ENOMEM; 2282 2283 iucv_sock_init(sk, NULL); 2284 2285 return 0; 2286 } 2287 2288 static const struct net_proto_family iucv_sock_family_ops = { 2289 .family = AF_IUCV, 2290 .owner = THIS_MODULE, 2291 .create = iucv_sock_create, 2292 }; 2293 2294 static struct packet_type iucv_packet_type = { 2295 .type = cpu_to_be16(ETH_P_AF_IUCV), 2296 .func = afiucv_hs_rcv, 2297 }; 2298 2299 static int __init afiucv_init(void) 2300 { 2301 int err; 2302 2303 if (machine_is_vm() && IS_ENABLED(CONFIG_IUCV)) { 2304 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); 2305 if (unlikely(err)) { 2306 WARN_ON(err); 2307 err = -EPROTONOSUPPORT; 2308 goto out; 2309 } 2310 2311 pr_iucv = &iucv_if; 2312 } else { 2313 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2314 pr_iucv = NULL; 2315 } 2316 2317 err = proto_register(&iucv_proto, 0); 2318 if (err) 2319 goto out; 2320 err = sock_register(&iucv_sock_family_ops); 2321 if (err) 2322 goto out_proto; 2323 2324 if (pr_iucv) { 2325 err = pr_iucv->iucv_register(&af_iucv_handler, 0); 2326 if (err) 2327 goto out_sock; 2328 } 2329 2330 err = register_netdevice_notifier(&afiucv_netdev_notifier); 2331 if (err) 2332 goto out_notifier; 2333 2334 dev_add_pack(&iucv_packet_type); 2335 return 0; 2336 2337 out_notifier: 2338 if (pr_iucv) 2339 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2340 out_sock: 2341 sock_unregister(PF_IUCV); 2342 out_proto: 2343 proto_unregister(&iucv_proto); 2344 out: 2345 return err; 2346 } 2347 2348 static void __exit afiucv_exit(void) 2349 { 2350 if (pr_iucv) 2351 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2352 2353 unregister_netdevice_notifier(&afiucv_netdev_notifier); 2354 dev_remove_pack(&iucv_packet_type); 2355 sock_unregister(PF_IUCV); 2356 proto_unregister(&iucv_proto); 2357 } 2358 2359 module_init(afiucv_init); 2360 module_exit(afiucv_exit); 2361 2362 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); 2363 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); 2364 MODULE_VERSION(VERSION); 2365 MODULE_LICENSE("GPL"); 2366 MODULE_ALIAS_NETPROTO(PF_IUCV); 2367