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