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 48 /* special AF_IUCV IPRM messages */ 49 static const u8 iprm_shutdown[8] = 50 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; 51 52 #define TRGCLS_SIZE sizeof_field(struct iucv_message, class) 53 54 #define __iucv_sock_wait(sk, condition, timeo, ret) \ 55 do { \ 56 DEFINE_WAIT(__wait); \ 57 long __timeo = timeo; \ 58 ret = 0; \ 59 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ 60 while (!(condition)) { \ 61 if (!__timeo) { \ 62 ret = -EAGAIN; \ 63 break; \ 64 } \ 65 if (signal_pending(current)) { \ 66 ret = sock_intr_errno(__timeo); \ 67 break; \ 68 } \ 69 release_sock(sk); \ 70 __timeo = schedule_timeout(__timeo); \ 71 lock_sock(sk); \ 72 ret = sock_error(sk); \ 73 if (ret) \ 74 break; \ 75 } \ 76 finish_wait(sk_sleep(sk), &__wait); \ 77 } while (0) 78 79 #define iucv_sock_wait(sk, condition, timeo) \ 80 ({ \ 81 int __ret = 0; \ 82 if (!(condition)) \ 83 __iucv_sock_wait(sk, condition, timeo, __ret); \ 84 __ret; \ 85 }) 86 87 static struct sock *iucv_accept_dequeue(struct sock *parent, 88 struct socket *newsock); 89 static void iucv_sock_kill(struct sock *sk); 90 static void iucv_sock_close(struct sock *sk); 91 92 static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify); 93 94 /* Call Back functions */ 95 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); 96 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); 97 static void iucv_callback_connack(struct iucv_path *, u8 *); 98 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *); 99 static void iucv_callback_connrej(struct iucv_path *, u8 *); 100 static void iucv_callback_shutdown(struct iucv_path *, u8 *); 101 102 static struct iucv_sock_list iucv_sk_list = { 103 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), 104 .autobind_name = ATOMIC_INIT(0) 105 }; 106 107 static struct iucv_handler af_iucv_handler = { 108 .path_pending = iucv_callback_connreq, 109 .path_complete = iucv_callback_connack, 110 .path_severed = iucv_callback_connrej, 111 .message_pending = iucv_callback_rx, 112 .message_complete = iucv_callback_txdone, 113 .path_quiesced = iucv_callback_shutdown, 114 }; 115 116 static inline void high_nmcpy(unsigned char *dst, char *src) 117 { 118 memcpy(dst, src, 8); 119 } 120 121 static inline void low_nmcpy(unsigned char *dst, char *src) 122 { 123 memcpy(&dst[8], src, 8); 124 } 125 126 /** 127 * iucv_msg_length() - Returns the length of an iucv message. 128 * @msg: Pointer to struct iucv_message, MUST NOT be NULL 129 * 130 * The function returns the length of the specified iucv message @msg of data 131 * stored in a buffer and of data stored in the parameter list (PRMDATA). 132 * 133 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket 134 * data: 135 * PRMDATA[0..6] socket data (max 7 bytes); 136 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) 137 * 138 * The socket data length is computed by subtracting the socket data length 139 * value from 0xFF. 140 * If the socket data len is greater 7, then PRMDATA can be used for special 141 * notifications (see iucv_sock_shutdown); and further, 142 * if the socket data len is > 7, the function returns 8. 143 * 144 * Use this function to allocate socket buffers to store iucv message data. 145 */ 146 static inline size_t iucv_msg_length(struct iucv_message *msg) 147 { 148 size_t datalen; 149 150 if (msg->flags & IUCV_IPRMDATA) { 151 datalen = 0xff - msg->rmmsg[7]; 152 return (datalen < 8) ? datalen : 8; 153 } 154 return msg->length; 155 } 156 157 /** 158 * iucv_sock_in_state() - check for specific states 159 * @sk: sock structure 160 * @state: first iucv sk state 161 * @state: second iucv sk state 162 * 163 * Returns true if the socket in either in the first or second state. 164 */ 165 static int iucv_sock_in_state(struct sock *sk, int state, int state2) 166 { 167 return (sk->sk_state == state || sk->sk_state == state2); 168 } 169 170 /** 171 * iucv_below_msglim() - function to check if messages can be sent 172 * @sk: sock structure 173 * 174 * Returns true if the send queue length is lower than the message limit. 175 * Always returns true if the socket is not connected (no iucv path for 176 * checking the message limit). 177 */ 178 static inline int iucv_below_msglim(struct sock *sk) 179 { 180 struct iucv_sock *iucv = iucv_sk(sk); 181 182 if (sk->sk_state != IUCV_CONNECTED) 183 return 1; 184 if (iucv->transport == AF_IUCV_TRANS_IUCV) 185 return (atomic_read(&iucv->skbs_in_xmit) < iucv->path->msglim); 186 else 187 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && 188 (atomic_read(&iucv->pendings) <= 0)); 189 } 190 191 /** 192 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit 193 */ 194 static void iucv_sock_wake_msglim(struct sock *sk) 195 { 196 struct socket_wq *wq; 197 198 rcu_read_lock(); 199 wq = rcu_dereference(sk->sk_wq); 200 if (skwq_has_sleeper(wq)) 201 wake_up_interruptible_all(&wq->wait); 202 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 203 rcu_read_unlock(); 204 } 205 206 /** 207 * afiucv_hs_send() - send a message through HiperSockets transport 208 */ 209 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 210 struct sk_buff *skb, u8 flags) 211 { 212 struct iucv_sock *iucv = iucv_sk(sock); 213 struct af_iucv_trans_hdr *phs_hdr; 214 int err, confirm_recv = 0; 215 216 phs_hdr = skb_push(skb, sizeof(*phs_hdr)); 217 memset(phs_hdr, 0, sizeof(*phs_hdr)); 218 skb_reset_network_header(skb); 219 220 phs_hdr->magic = ETH_P_AF_IUCV; 221 phs_hdr->version = 1; 222 phs_hdr->flags = flags; 223 if (flags == AF_IUCV_FLAG_SYN) 224 phs_hdr->window = iucv->msglimit; 225 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { 226 confirm_recv = atomic_read(&iucv->msg_recv); 227 phs_hdr->window = confirm_recv; 228 if (confirm_recv) 229 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; 230 } 231 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); 232 memcpy(phs_hdr->destAppName, iucv->dst_name, 8); 233 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); 234 memcpy(phs_hdr->srcAppName, iucv->src_name, 8); 235 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); 236 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); 237 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); 238 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); 239 if (imsg) 240 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); 241 242 skb->dev = iucv->hs_dev; 243 if (!skb->dev) { 244 err = -ENODEV; 245 goto err_free; 246 } 247 248 dev_hard_header(skb, skb->dev, ETH_P_AF_IUCV, NULL, NULL, skb->len); 249 250 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) { 251 err = -ENETDOWN; 252 goto err_free; 253 } 254 if (skb->len > skb->dev->mtu) { 255 if (sock->sk_type == SOCK_SEQPACKET) { 256 err = -EMSGSIZE; 257 goto err_free; 258 } 259 err = pskb_trim(skb, skb->dev->mtu); 260 if (err) 261 goto err_free; 262 } 263 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV); 264 265 atomic_inc(&iucv->skbs_in_xmit); 266 err = dev_queue_xmit(skb); 267 if (net_xmit_eval(err)) { 268 atomic_dec(&iucv->skbs_in_xmit); 269 } else { 270 atomic_sub(confirm_recv, &iucv->msg_recv); 271 WARN_ON(atomic_read(&iucv->msg_recv) < 0); 272 } 273 return net_xmit_eval(err); 274 275 err_free: 276 kfree_skb(skb); 277 return err; 278 } 279 280 static struct sock *__iucv_get_sock_by_name(char *nm) 281 { 282 struct sock *sk; 283 284 sk_for_each(sk, &iucv_sk_list.head) 285 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) 286 return sk; 287 288 return NULL; 289 } 290 291 static void iucv_sock_destruct(struct sock *sk) 292 { 293 skb_queue_purge(&sk->sk_receive_queue); 294 skb_queue_purge(&sk->sk_error_queue); 295 296 sk_mem_reclaim(sk); 297 298 if (!sock_flag(sk, SOCK_DEAD)) { 299 pr_err("Attempt to release alive iucv socket %p\n", sk); 300 return; 301 } 302 303 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 304 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 305 WARN_ON(sk->sk_wmem_queued); 306 WARN_ON(sk->sk_forward_alloc); 307 } 308 309 /* Cleanup Listen */ 310 static void iucv_sock_cleanup_listen(struct sock *parent) 311 { 312 struct sock *sk; 313 314 /* Close non-accepted connections */ 315 while ((sk = iucv_accept_dequeue(parent, NULL))) { 316 iucv_sock_close(sk); 317 iucv_sock_kill(sk); 318 } 319 320 parent->sk_state = IUCV_CLOSED; 321 } 322 323 static void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) 324 { 325 write_lock_bh(&l->lock); 326 sk_add_node(sk, &l->head); 327 write_unlock_bh(&l->lock); 328 } 329 330 static void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) 331 { 332 write_lock_bh(&l->lock); 333 sk_del_node_init(sk); 334 write_unlock_bh(&l->lock); 335 } 336 337 /* Kill socket (only if zapped and orphaned) */ 338 static void iucv_sock_kill(struct sock *sk) 339 { 340 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) 341 return; 342 343 iucv_sock_unlink(&iucv_sk_list, sk); 344 sock_set_flag(sk, SOCK_DEAD); 345 sock_put(sk); 346 } 347 348 /* Terminate an IUCV path */ 349 static void iucv_sever_path(struct sock *sk, int with_user_data) 350 { 351 unsigned char user_data[16]; 352 struct iucv_sock *iucv = iucv_sk(sk); 353 struct iucv_path *path = iucv->path; 354 355 if (iucv->path) { 356 iucv->path = NULL; 357 if (with_user_data) { 358 low_nmcpy(user_data, iucv->src_name); 359 high_nmcpy(user_data, iucv->dst_name); 360 ASCEBC(user_data, sizeof(user_data)); 361 pr_iucv->path_sever(path, user_data); 362 } else 363 pr_iucv->path_sever(path, NULL); 364 iucv_path_free(path); 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->src_user_id , 0, 32); 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 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); 573 while (__iucv_get_sock_by_name(name)) { 574 sprintf(name, "%08x", 575 atomic_inc_return(&iucv_sk_list.autobind_name)); 576 } 577 memcpy(iucv->src_name, name, 8); 578 } 579 580 /* Bind an unbound socket */ 581 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, 582 int addr_len) 583 { 584 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); 585 char uid[sizeof(sa->siucv_user_id)]; 586 struct sock *sk = sock->sk; 587 struct iucv_sock *iucv; 588 int err = 0; 589 struct net_device *dev; 590 591 /* Verify the input sockaddr */ 592 if (addr_len < sizeof(struct sockaddr_iucv) || 593 addr->sa_family != AF_IUCV) 594 return -EINVAL; 595 596 lock_sock(sk); 597 if (sk->sk_state != IUCV_OPEN) { 598 err = -EBADFD; 599 goto done; 600 } 601 602 write_lock_bh(&iucv_sk_list.lock); 603 604 iucv = iucv_sk(sk); 605 if (__iucv_get_sock_by_name(sa->siucv_name)) { 606 err = -EADDRINUSE; 607 goto done_unlock; 608 } 609 if (iucv->path) 610 goto done_unlock; 611 612 /* Bind the socket */ 613 if (pr_iucv) 614 if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) 615 goto vm_bind; /* VM IUCV transport */ 616 617 /* try hiper transport */ 618 memcpy(uid, sa->siucv_user_id, sizeof(uid)); 619 ASCEBC(uid, 8); 620 rcu_read_lock(); 621 for_each_netdev_rcu(&init_net, dev) { 622 if (!memcmp(dev->perm_addr, uid, 8)) { 623 memcpy(iucv->src_user_id, sa->siucv_user_id, 8); 624 /* Check for uninitialized siucv_name */ 625 if (strncmp(sa->siucv_name, " ", 8) == 0) 626 __iucv_auto_name(iucv); 627 else 628 memcpy(iucv->src_name, sa->siucv_name, 8); 629 sk->sk_bound_dev_if = dev->ifindex; 630 iucv->hs_dev = dev; 631 dev_hold(dev); 632 sk->sk_state = IUCV_BOUND; 633 iucv->transport = AF_IUCV_TRANS_HIPER; 634 if (!iucv->msglimit) 635 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; 636 rcu_read_unlock(); 637 goto done_unlock; 638 } 639 } 640 rcu_read_unlock(); 641 vm_bind: 642 if (pr_iucv) { 643 /* use local userid for backward compat */ 644 memcpy(iucv->src_name, sa->siucv_name, 8); 645 memcpy(iucv->src_user_id, iucv_userid, 8); 646 sk->sk_state = IUCV_BOUND; 647 iucv->transport = AF_IUCV_TRANS_IUCV; 648 sk->sk_allocation |= GFP_DMA; 649 if (!iucv->msglimit) 650 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 651 goto done_unlock; 652 } 653 /* found no dev to bind */ 654 err = -ENODEV; 655 done_unlock: 656 /* Release the socket list lock */ 657 write_unlock_bh(&iucv_sk_list.lock); 658 done: 659 release_sock(sk); 660 return err; 661 } 662 663 /* Automatically bind an unbound socket */ 664 static int iucv_sock_autobind(struct sock *sk) 665 { 666 struct iucv_sock *iucv = iucv_sk(sk); 667 int err = 0; 668 669 if (unlikely(!pr_iucv)) 670 return -EPROTO; 671 672 memcpy(iucv->src_user_id, iucv_userid, 8); 673 iucv->transport = AF_IUCV_TRANS_IUCV; 674 sk->sk_allocation |= GFP_DMA; 675 676 write_lock_bh(&iucv_sk_list.lock); 677 __iucv_auto_name(iucv); 678 write_unlock_bh(&iucv_sk_list.lock); 679 680 if (!iucv->msglimit) 681 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 682 683 return err; 684 } 685 686 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) 687 { 688 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); 689 struct sock *sk = sock->sk; 690 struct iucv_sock *iucv = iucv_sk(sk); 691 unsigned char user_data[16]; 692 int err; 693 694 high_nmcpy(user_data, sa->siucv_name); 695 low_nmcpy(user_data, iucv->src_name); 696 ASCEBC(user_data, sizeof(user_data)); 697 698 /* Create path. */ 699 iucv->path = iucv_path_alloc(iucv->msglimit, 700 IUCV_IPRMDATA, GFP_KERNEL); 701 if (!iucv->path) { 702 err = -ENOMEM; 703 goto done; 704 } 705 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, 706 sa->siucv_user_id, NULL, user_data, 707 sk); 708 if (err) { 709 iucv_path_free(iucv->path); 710 iucv->path = NULL; 711 switch (err) { 712 case 0x0b: /* Target communicator is not logged on */ 713 err = -ENETUNREACH; 714 break; 715 case 0x0d: /* Max connections for this guest exceeded */ 716 case 0x0e: /* Max connections for target guest exceeded */ 717 err = -EAGAIN; 718 break; 719 case 0x0f: /* Missing IUCV authorization */ 720 err = -EACCES; 721 break; 722 default: 723 err = -ECONNREFUSED; 724 break; 725 } 726 } 727 done: 728 return err; 729 } 730 731 /* Connect an unconnected socket */ 732 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, 733 int alen, int flags) 734 { 735 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); 736 struct sock *sk = sock->sk; 737 struct iucv_sock *iucv = iucv_sk(sk); 738 int err; 739 740 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV) 741 return -EINVAL; 742 743 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) 744 return -EBADFD; 745 746 if (sk->sk_state == IUCV_OPEN && 747 iucv->transport == AF_IUCV_TRANS_HIPER) 748 return -EBADFD; /* explicit bind required */ 749 750 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) 751 return -EINVAL; 752 753 if (sk->sk_state == IUCV_OPEN) { 754 err = iucv_sock_autobind(sk); 755 if (unlikely(err)) 756 return err; 757 } 758 759 lock_sock(sk); 760 761 /* Set the destination information */ 762 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); 763 memcpy(iucv->dst_name, sa->siucv_name, 8); 764 765 if (iucv->transport == AF_IUCV_TRANS_HIPER) 766 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); 767 else 768 err = afiucv_path_connect(sock, addr); 769 if (err) 770 goto done; 771 772 if (sk->sk_state != IUCV_CONNECTED) 773 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, 774 IUCV_DISCONN), 775 sock_sndtimeo(sk, flags & O_NONBLOCK)); 776 777 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) 778 err = -ECONNREFUSED; 779 780 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) 781 iucv_sever_path(sk, 0); 782 783 done: 784 release_sock(sk); 785 return err; 786 } 787 788 /* Move a socket into listening state. */ 789 static int iucv_sock_listen(struct socket *sock, int backlog) 790 { 791 struct sock *sk = sock->sk; 792 int err; 793 794 lock_sock(sk); 795 796 err = -EINVAL; 797 if (sk->sk_state != IUCV_BOUND) 798 goto done; 799 800 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) 801 goto done; 802 803 sk->sk_max_ack_backlog = backlog; 804 sk->sk_ack_backlog = 0; 805 sk->sk_state = IUCV_LISTEN; 806 err = 0; 807 808 done: 809 release_sock(sk); 810 return err; 811 } 812 813 /* Accept a pending connection */ 814 static int iucv_sock_accept(struct socket *sock, struct socket *newsock, 815 int flags, bool kern) 816 { 817 DECLARE_WAITQUEUE(wait, current); 818 struct sock *sk = sock->sk, *nsk; 819 long timeo; 820 int err = 0; 821 822 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 823 824 if (sk->sk_state != IUCV_LISTEN) { 825 err = -EBADFD; 826 goto done; 827 } 828 829 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 830 831 /* Wait for an incoming connection */ 832 add_wait_queue_exclusive(sk_sleep(sk), &wait); 833 while (!(nsk = iucv_accept_dequeue(sk, newsock))) { 834 set_current_state(TASK_INTERRUPTIBLE); 835 if (!timeo) { 836 err = -EAGAIN; 837 break; 838 } 839 840 release_sock(sk); 841 timeo = schedule_timeout(timeo); 842 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 843 844 if (sk->sk_state != IUCV_LISTEN) { 845 err = -EBADFD; 846 break; 847 } 848 849 if (signal_pending(current)) { 850 err = sock_intr_errno(timeo); 851 break; 852 } 853 } 854 855 set_current_state(TASK_RUNNING); 856 remove_wait_queue(sk_sleep(sk), &wait); 857 858 if (err) 859 goto done; 860 861 newsock->state = SS_CONNECTED; 862 863 done: 864 release_sock(sk); 865 return err; 866 } 867 868 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, 869 int peer) 870 { 871 DECLARE_SOCKADDR(struct sockaddr_iucv *, siucv, addr); 872 struct sock *sk = sock->sk; 873 struct iucv_sock *iucv = iucv_sk(sk); 874 875 addr->sa_family = AF_IUCV; 876 877 if (peer) { 878 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); 879 memcpy(siucv->siucv_name, iucv->dst_name, 8); 880 } else { 881 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); 882 memcpy(siucv->siucv_name, iucv->src_name, 8); 883 } 884 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); 885 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); 886 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); 887 888 return sizeof(struct sockaddr_iucv); 889 } 890 891 /** 892 * iucv_send_iprm() - Send socket data in parameter list of an iucv message. 893 * @path: IUCV path 894 * @msg: Pointer to a struct iucv_message 895 * @skb: The socket data to send, skb->len MUST BE <= 7 896 * 897 * Send the socket data in the parameter list in the iucv message 898 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter 899 * list and the socket data len at index 7 (last byte). 900 * See also iucv_msg_length(). 901 * 902 * Returns the error code from the iucv_message_send() call. 903 */ 904 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, 905 struct sk_buff *skb) 906 { 907 u8 prmdata[8]; 908 909 memcpy(prmdata, (void *) skb->data, skb->len); 910 prmdata[7] = 0xff - (u8) skb->len; 911 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, 912 (void *) prmdata, 8); 913 } 914 915 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg, 916 size_t len) 917 { 918 struct sock *sk = sock->sk; 919 struct iucv_sock *iucv = iucv_sk(sk); 920 size_t headroom = 0; 921 size_t linear; 922 struct sk_buff *skb; 923 struct iucv_message txmsg = {0}; 924 struct cmsghdr *cmsg; 925 int cmsg_done; 926 long timeo; 927 char user_id[9]; 928 char appl_id[9]; 929 int err; 930 int noblock = msg->msg_flags & MSG_DONTWAIT; 931 932 err = sock_error(sk); 933 if (err) 934 return err; 935 936 if (msg->msg_flags & MSG_OOB) 937 return -EOPNOTSUPP; 938 939 /* SOCK_SEQPACKET: we do not support segmented records */ 940 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) 941 return -EOPNOTSUPP; 942 943 lock_sock(sk); 944 945 if (sk->sk_shutdown & SEND_SHUTDOWN) { 946 err = -EPIPE; 947 goto out; 948 } 949 950 /* Return if the socket is not in connected state */ 951 if (sk->sk_state != IUCV_CONNECTED) { 952 err = -ENOTCONN; 953 goto out; 954 } 955 956 /* initialize defaults */ 957 cmsg_done = 0; /* check for duplicate headers */ 958 959 /* iterate over control messages */ 960 for_each_cmsghdr(cmsg, msg) { 961 if (!CMSG_OK(msg, cmsg)) { 962 err = -EINVAL; 963 goto out; 964 } 965 966 if (cmsg->cmsg_level != SOL_IUCV) 967 continue; 968 969 if (cmsg->cmsg_type & cmsg_done) { 970 err = -EINVAL; 971 goto out; 972 } 973 cmsg_done |= cmsg->cmsg_type; 974 975 switch (cmsg->cmsg_type) { 976 case SCM_IUCV_TRGCLS: 977 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { 978 err = -EINVAL; 979 goto out; 980 } 981 982 /* set iucv message target class */ 983 memcpy(&txmsg.class, 984 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); 985 986 break; 987 988 default: 989 err = -EINVAL; 990 goto out; 991 } 992 } 993 994 /* allocate one skb for each iucv message: 995 * this is fine for SOCK_SEQPACKET (unless we want to support 996 * segmented records using the MSG_EOR flag), but 997 * for SOCK_STREAM we might want to improve it in future */ 998 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 999 headroom = sizeof(struct af_iucv_trans_hdr) + 1000 LL_RESERVED_SPACE(iucv->hs_dev); 1001 linear = min(len, PAGE_SIZE - headroom); 1002 } else { 1003 if (len < PAGE_SIZE) { 1004 linear = len; 1005 } else { 1006 /* In nonlinear "classic" iucv skb, 1007 * reserve space for iucv_array 1008 */ 1009 headroom = sizeof(struct iucv_array) * 1010 (MAX_SKB_FRAGS + 1); 1011 linear = PAGE_SIZE - headroom; 1012 } 1013 } 1014 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear, 1015 noblock, &err, 0); 1016 if (!skb) 1017 goto out; 1018 if (headroom) 1019 skb_reserve(skb, headroom); 1020 skb_put(skb, linear); 1021 skb->len = len; 1022 skb->data_len = len - linear; 1023 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len); 1024 if (err) 1025 goto fail; 1026 1027 /* wait if outstanding messages for iucv path has reached */ 1028 timeo = sock_sndtimeo(sk, noblock); 1029 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); 1030 if (err) 1031 goto fail; 1032 1033 /* return -ECONNRESET if the socket is no longer connected */ 1034 if (sk->sk_state != IUCV_CONNECTED) { 1035 err = -ECONNRESET; 1036 goto fail; 1037 } 1038 1039 /* increment and save iucv message tag for msg_completion cbk */ 1040 txmsg.tag = iucv->send_tag++; 1041 IUCV_SKB_CB(skb)->tag = txmsg.tag; 1042 1043 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1044 atomic_inc(&iucv->msg_sent); 1045 err = afiucv_hs_send(&txmsg, sk, skb, 0); 1046 if (err) { 1047 atomic_dec(&iucv->msg_sent); 1048 goto out; 1049 } 1050 } else { /* Classic VM IUCV transport */ 1051 skb_queue_tail(&iucv->send_skb_q, skb); 1052 atomic_inc(&iucv->skbs_in_xmit); 1053 1054 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) && 1055 skb->len <= 7) { 1056 err = iucv_send_iprm(iucv->path, &txmsg, skb); 1057 1058 /* on success: there is no message_complete callback */ 1059 /* for an IPRMDATA msg; remove skb from send queue */ 1060 if (err == 0) { 1061 atomic_dec(&iucv->skbs_in_xmit); 1062 skb_unlink(skb, &iucv->send_skb_q); 1063 kfree_skb(skb); 1064 } 1065 1066 /* this error should never happen since the */ 1067 /* IUCV_IPRMDATA path flag is set... sever path */ 1068 if (err == 0x15) { 1069 pr_iucv->path_sever(iucv->path, NULL); 1070 atomic_dec(&iucv->skbs_in_xmit); 1071 skb_unlink(skb, &iucv->send_skb_q); 1072 err = -EPIPE; 1073 goto fail; 1074 } 1075 } else if (skb_is_nonlinear(skb)) { 1076 struct iucv_array *iba = (struct iucv_array *)skb->head; 1077 int i; 1078 1079 /* skip iucv_array lying in the headroom */ 1080 iba[0].address = (u32)(addr_t)skb->data; 1081 iba[0].length = (u32)skb_headlen(skb); 1082 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1083 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1084 1085 iba[i + 1].address = 1086 (u32)(addr_t)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 = (u32)(addr_t)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 = 1188 (u32)(addr_t)skb_frag_address(frag); 1189 iba[i + 1].length = (u32)skb_frag_size(frag); 1190 } 1191 rc = pr_iucv->message_receive(path, msg, 1192 IUCV_IPBUFLST, 1193 (void *)iba, len, NULL); 1194 } else { 1195 rc = pr_iucv->message_receive(path, msg, 1196 msg->flags & IUCV_IPRMDATA, 1197 skb->data, len, NULL); 1198 } 1199 if (rc) { 1200 kfree_skb(skb); 1201 return; 1202 } 1203 WARN_ON_ONCE(skb->len != len); 1204 } 1205 1206 IUCV_SKB_CB(skb)->offset = 0; 1207 if (sk_filter(sk, skb)) { 1208 atomic_inc(&sk->sk_drops); /* skb rejected by filter */ 1209 kfree_skb(skb); 1210 return; 1211 } 1212 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */ 1213 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 1214 } 1215 1216 /* iucv_process_message_q() - Process outstanding IUCV messages 1217 * 1218 * Locking: must be called with message_q.lock held 1219 */ 1220 static void iucv_process_message_q(struct sock *sk) 1221 { 1222 struct iucv_sock *iucv = iucv_sk(sk); 1223 struct sk_buff *skb; 1224 struct sock_msg_q *p, *n; 1225 1226 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 1227 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg)); 1228 if (!skb) 1229 break; 1230 iucv_process_message(sk, skb, p->path, &p->msg); 1231 list_del(&p->list); 1232 kfree(p); 1233 if (!skb_queue_empty(&iucv->backlog_skb_q)) 1234 break; 1235 } 1236 } 1237 1238 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg, 1239 size_t len, int flags) 1240 { 1241 int noblock = flags & MSG_DONTWAIT; 1242 struct sock *sk = sock->sk; 1243 struct iucv_sock *iucv = iucv_sk(sk); 1244 unsigned int copied, rlen; 1245 struct sk_buff *skb, *rskb, *cskb; 1246 int err = 0; 1247 u32 offset; 1248 1249 if ((sk->sk_state == IUCV_DISCONN) && 1250 skb_queue_empty(&iucv->backlog_skb_q) && 1251 skb_queue_empty(&sk->sk_receive_queue) && 1252 list_empty(&iucv->message_q.list)) 1253 return 0; 1254 1255 if (flags & (MSG_OOB)) 1256 return -EOPNOTSUPP; 1257 1258 /* receive/dequeue next skb: 1259 * the function understands MSG_PEEK and, thus, does not dequeue skb */ 1260 skb = skb_recv_datagram(sk, flags, noblock, &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 if (!(flags & MSG_PEEK)) 1276 skb_queue_head(&sk->sk_receive_queue, skb); 1277 return -EFAULT; 1278 } 1279 1280 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ 1281 if (sk->sk_type == SOCK_SEQPACKET) { 1282 if (copied < rlen) 1283 msg->msg_flags |= MSG_TRUNC; 1284 /* each iucv message contains a complete record */ 1285 msg->msg_flags |= MSG_EOR; 1286 } 1287 1288 /* create control message to store iucv msg target class: 1289 * get the trgcls from the control buffer of the skb due to 1290 * fragmentation of original iucv message. */ 1291 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, 1292 sizeof(IUCV_SKB_CB(skb)->class), 1293 (void *)&IUCV_SKB_CB(skb)->class); 1294 if (err) { 1295 if (!(flags & MSG_PEEK)) 1296 skb_queue_head(&sk->sk_receive_queue, skb); 1297 return err; 1298 } 1299 1300 /* Mark read part of skb as used */ 1301 if (!(flags & MSG_PEEK)) { 1302 1303 /* SOCK_STREAM: re-queue skb if it contains unreceived data */ 1304 if (sk->sk_type == SOCK_STREAM) { 1305 if (copied < rlen) { 1306 IUCV_SKB_CB(skb)->offset = offset + copied; 1307 skb_queue_head(&sk->sk_receive_queue, skb); 1308 goto done; 1309 } 1310 } 1311 1312 kfree_skb(skb); 1313 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1314 atomic_inc(&iucv->msg_recv); 1315 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { 1316 WARN_ON(1); 1317 iucv_sock_close(sk); 1318 return -EFAULT; 1319 } 1320 } 1321 1322 /* Queue backlog skbs */ 1323 spin_lock_bh(&iucv->message_q.lock); 1324 rskb = skb_dequeue(&iucv->backlog_skb_q); 1325 while (rskb) { 1326 IUCV_SKB_CB(rskb)->offset = 0; 1327 if (__sock_queue_rcv_skb(sk, rskb)) { 1328 /* handle rcv queue full */ 1329 skb_queue_head(&iucv->backlog_skb_q, 1330 rskb); 1331 break; 1332 } 1333 rskb = skb_dequeue(&iucv->backlog_skb_q); 1334 } 1335 if (skb_queue_empty(&iucv->backlog_skb_q)) { 1336 if (!list_empty(&iucv->message_q.list)) 1337 iucv_process_message_q(sk); 1338 if (atomic_read(&iucv->msg_recv) >= 1339 iucv->msglimit / 2) { 1340 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); 1341 if (err) { 1342 sk->sk_state = IUCV_DISCONN; 1343 sk->sk_state_change(sk); 1344 } 1345 } 1346 } 1347 spin_unlock_bh(&iucv->message_q.lock); 1348 } 1349 1350 done: 1351 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ 1352 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) 1353 copied = rlen; 1354 1355 return copied; 1356 } 1357 1358 static inline __poll_t iucv_accept_poll(struct sock *parent) 1359 { 1360 struct iucv_sock *isk, *n; 1361 struct sock *sk; 1362 1363 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 1364 sk = (struct sock *) isk; 1365 1366 if (sk->sk_state == IUCV_CONNECTED) 1367 return EPOLLIN | EPOLLRDNORM; 1368 } 1369 1370 return 0; 1371 } 1372 1373 static __poll_t iucv_sock_poll(struct file *file, struct socket *sock, 1374 poll_table *wait) 1375 { 1376 struct sock *sk = sock->sk; 1377 __poll_t mask = 0; 1378 1379 sock_poll_wait(file, sock, wait); 1380 1381 if (sk->sk_state == IUCV_LISTEN) 1382 return iucv_accept_poll(sk); 1383 1384 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) 1385 mask |= EPOLLERR | 1386 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0); 1387 1388 if (sk->sk_shutdown & RCV_SHUTDOWN) 1389 mask |= EPOLLRDHUP; 1390 1391 if (sk->sk_shutdown == SHUTDOWN_MASK) 1392 mask |= EPOLLHUP; 1393 1394 if (!skb_queue_empty(&sk->sk_receive_queue) || 1395 (sk->sk_shutdown & RCV_SHUTDOWN)) 1396 mask |= EPOLLIN | EPOLLRDNORM; 1397 1398 if (sk->sk_state == IUCV_CLOSED) 1399 mask |= EPOLLHUP; 1400 1401 if (sk->sk_state == IUCV_DISCONN) 1402 mask |= EPOLLIN; 1403 1404 if (sock_writeable(sk) && iucv_below_msglim(sk)) 1405 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; 1406 else 1407 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 1408 1409 return mask; 1410 } 1411 1412 static int iucv_sock_shutdown(struct socket *sock, int how) 1413 { 1414 struct sock *sk = sock->sk; 1415 struct iucv_sock *iucv = iucv_sk(sk); 1416 struct iucv_message txmsg; 1417 int err = 0; 1418 1419 how++; 1420 1421 if ((how & ~SHUTDOWN_MASK) || !how) 1422 return -EINVAL; 1423 1424 lock_sock(sk); 1425 switch (sk->sk_state) { 1426 case IUCV_LISTEN: 1427 case IUCV_DISCONN: 1428 case IUCV_CLOSING: 1429 case IUCV_CLOSED: 1430 err = -ENOTCONN; 1431 goto fail; 1432 default: 1433 break; 1434 } 1435 1436 if ((how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) && 1437 sk->sk_state == IUCV_CONNECTED) { 1438 if (iucv->transport == AF_IUCV_TRANS_IUCV) { 1439 txmsg.class = 0; 1440 txmsg.tag = 0; 1441 err = pr_iucv->message_send(iucv->path, &txmsg, 1442 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); 1443 if (err) { 1444 switch (err) { 1445 case 1: 1446 err = -ENOTCONN; 1447 break; 1448 case 2: 1449 err = -ECONNRESET; 1450 break; 1451 default: 1452 err = -ENOTCONN; 1453 break; 1454 } 1455 } 1456 } else 1457 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); 1458 } 1459 1460 sk->sk_shutdown |= how; 1461 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { 1462 if ((iucv->transport == AF_IUCV_TRANS_IUCV) && 1463 iucv->path) { 1464 err = pr_iucv->path_quiesce(iucv->path, NULL); 1465 if (err) 1466 err = -ENOTCONN; 1467 /* skb_queue_purge(&sk->sk_receive_queue); */ 1468 } 1469 skb_queue_purge(&sk->sk_receive_queue); 1470 } 1471 1472 /* Wake up anyone sleeping in poll */ 1473 sk->sk_state_change(sk); 1474 1475 fail: 1476 release_sock(sk); 1477 return err; 1478 } 1479 1480 static int iucv_sock_release(struct socket *sock) 1481 { 1482 struct sock *sk = sock->sk; 1483 int err = 0; 1484 1485 if (!sk) 1486 return 0; 1487 1488 iucv_sock_close(sk); 1489 1490 sock_orphan(sk); 1491 iucv_sock_kill(sk); 1492 return err; 1493 } 1494 1495 /* getsockopt and setsockopt */ 1496 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, 1497 sockptr_t optval, unsigned int optlen) 1498 { 1499 struct sock *sk = sock->sk; 1500 struct iucv_sock *iucv = iucv_sk(sk); 1501 int val; 1502 int rc; 1503 1504 if (level != SOL_IUCV) 1505 return -ENOPROTOOPT; 1506 1507 if (optlen < sizeof(int)) 1508 return -EINVAL; 1509 1510 if (copy_from_sockptr(&val, optval, sizeof(int))) 1511 return -EFAULT; 1512 1513 rc = 0; 1514 1515 lock_sock(sk); 1516 switch (optname) { 1517 case SO_IPRMDATA_MSG: 1518 if (val) 1519 iucv->flags |= IUCV_IPRMDATA; 1520 else 1521 iucv->flags &= ~IUCV_IPRMDATA; 1522 break; 1523 case SO_MSGLIMIT: 1524 switch (sk->sk_state) { 1525 case IUCV_OPEN: 1526 case IUCV_BOUND: 1527 if (val < 1 || val > U16_MAX) 1528 rc = -EINVAL; 1529 else 1530 iucv->msglimit = val; 1531 break; 1532 default: 1533 rc = -EINVAL; 1534 break; 1535 } 1536 break; 1537 default: 1538 rc = -ENOPROTOOPT; 1539 break; 1540 } 1541 release_sock(sk); 1542 1543 return rc; 1544 } 1545 1546 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, 1547 char __user *optval, int __user *optlen) 1548 { 1549 struct sock *sk = sock->sk; 1550 struct iucv_sock *iucv = iucv_sk(sk); 1551 unsigned int val; 1552 int len; 1553 1554 if (level != SOL_IUCV) 1555 return -ENOPROTOOPT; 1556 1557 if (get_user(len, optlen)) 1558 return -EFAULT; 1559 1560 if (len < 0) 1561 return -EINVAL; 1562 1563 len = min_t(unsigned int, len, sizeof(int)); 1564 1565 switch (optname) { 1566 case SO_IPRMDATA_MSG: 1567 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; 1568 break; 1569 case SO_MSGLIMIT: 1570 lock_sock(sk); 1571 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ 1572 : iucv->msglimit; /* default */ 1573 release_sock(sk); 1574 break; 1575 case SO_MSGSIZE: 1576 if (sk->sk_state == IUCV_OPEN) 1577 return -EBADFD; 1578 val = (iucv->hs_dev) ? iucv->hs_dev->mtu - 1579 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : 1580 0x7fffffff; 1581 break; 1582 default: 1583 return -ENOPROTOOPT; 1584 } 1585 1586 if (put_user(len, optlen)) 1587 return -EFAULT; 1588 if (copy_to_user(optval, &val, len)) 1589 return -EFAULT; 1590 1591 return 0; 1592 } 1593 1594 1595 /* Callback wrappers - called from iucv base support */ 1596 static int iucv_callback_connreq(struct iucv_path *path, 1597 u8 ipvmid[8], u8 ipuser[16]) 1598 { 1599 unsigned char user_data[16]; 1600 unsigned char nuser_data[16]; 1601 unsigned char src_name[8]; 1602 struct sock *sk, *nsk; 1603 struct iucv_sock *iucv, *niucv; 1604 int err; 1605 1606 memcpy(src_name, ipuser, 8); 1607 EBCASC(src_name, 8); 1608 /* Find out if this path belongs to af_iucv. */ 1609 read_lock(&iucv_sk_list.lock); 1610 iucv = NULL; 1611 sk = NULL; 1612 sk_for_each(sk, &iucv_sk_list.head) 1613 if (sk->sk_state == IUCV_LISTEN && 1614 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { 1615 /* 1616 * Found a listening socket with 1617 * src_name == ipuser[0-7]. 1618 */ 1619 iucv = iucv_sk(sk); 1620 break; 1621 } 1622 read_unlock(&iucv_sk_list.lock); 1623 if (!iucv) 1624 /* No socket found, not one of our paths. */ 1625 return -EINVAL; 1626 1627 bh_lock_sock(sk); 1628 1629 /* Check if parent socket is listening */ 1630 low_nmcpy(user_data, iucv->src_name); 1631 high_nmcpy(user_data, iucv->dst_name); 1632 ASCEBC(user_data, sizeof(user_data)); 1633 if (sk->sk_state != IUCV_LISTEN) { 1634 err = pr_iucv->path_sever(path, user_data); 1635 iucv_path_free(path); 1636 goto fail; 1637 } 1638 1639 /* Check for backlog size */ 1640 if (sk_acceptq_is_full(sk)) { 1641 err = pr_iucv->path_sever(path, user_data); 1642 iucv_path_free(path); 1643 goto fail; 1644 } 1645 1646 /* Create the new socket */ 1647 nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0); 1648 if (!nsk) { 1649 err = pr_iucv->path_sever(path, user_data); 1650 iucv_path_free(path); 1651 goto fail; 1652 } 1653 1654 niucv = iucv_sk(nsk); 1655 iucv_sock_init(nsk, sk); 1656 niucv->transport = AF_IUCV_TRANS_IUCV; 1657 nsk->sk_allocation |= GFP_DMA; 1658 1659 /* Set the new iucv_sock */ 1660 memcpy(niucv->dst_name, ipuser + 8, 8); 1661 EBCASC(niucv->dst_name, 8); 1662 memcpy(niucv->dst_user_id, ipvmid, 8); 1663 memcpy(niucv->src_name, iucv->src_name, 8); 1664 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1665 niucv->path = path; 1666 1667 /* Call iucv_accept */ 1668 high_nmcpy(nuser_data, ipuser + 8); 1669 memcpy(nuser_data + 8, niucv->src_name, 8); 1670 ASCEBC(nuser_data + 8, 8); 1671 1672 /* set message limit for path based on msglimit of accepting socket */ 1673 niucv->msglimit = iucv->msglimit; 1674 path->msglim = iucv->msglimit; 1675 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); 1676 if (err) { 1677 iucv_sever_path(nsk, 1); 1678 iucv_sock_kill(nsk); 1679 goto fail; 1680 } 1681 1682 iucv_accept_enqueue(sk, nsk); 1683 1684 /* Wake up accept */ 1685 nsk->sk_state = IUCV_CONNECTED; 1686 sk->sk_data_ready(sk); 1687 err = 0; 1688 fail: 1689 bh_unlock_sock(sk); 1690 return 0; 1691 } 1692 1693 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) 1694 { 1695 struct sock *sk = path->private; 1696 1697 sk->sk_state = IUCV_CONNECTED; 1698 sk->sk_state_change(sk); 1699 } 1700 1701 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) 1702 { 1703 struct sock *sk = path->private; 1704 struct iucv_sock *iucv = iucv_sk(sk); 1705 struct sk_buff *skb; 1706 struct sock_msg_q *save_msg; 1707 int len; 1708 1709 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1710 pr_iucv->message_reject(path, msg); 1711 return; 1712 } 1713 1714 spin_lock(&iucv->message_q.lock); 1715 1716 if (!list_empty(&iucv->message_q.list) || 1717 !skb_queue_empty(&iucv->backlog_skb_q)) 1718 goto save_message; 1719 1720 len = atomic_read(&sk->sk_rmem_alloc); 1721 len += SKB_TRUESIZE(iucv_msg_length(msg)); 1722 if (len > sk->sk_rcvbuf) 1723 goto save_message; 1724 1725 skb = alloc_iucv_recv_skb(iucv_msg_length(msg)); 1726 if (!skb) 1727 goto save_message; 1728 1729 iucv_process_message(sk, skb, path, msg); 1730 goto out_unlock; 1731 1732 save_message: 1733 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); 1734 if (!save_msg) 1735 goto out_unlock; 1736 save_msg->path = path; 1737 save_msg->msg = *msg; 1738 1739 list_add_tail(&save_msg->list, &iucv->message_q.list); 1740 1741 out_unlock: 1742 spin_unlock(&iucv->message_q.lock); 1743 } 1744 1745 static void iucv_callback_txdone(struct iucv_path *path, 1746 struct iucv_message *msg) 1747 { 1748 struct sock *sk = path->private; 1749 struct sk_buff *this = NULL; 1750 struct sk_buff_head *list; 1751 struct sk_buff *list_skb; 1752 struct iucv_sock *iucv; 1753 unsigned long flags; 1754 1755 iucv = iucv_sk(sk); 1756 list = &iucv->send_skb_q; 1757 1758 bh_lock_sock(sk); 1759 1760 spin_lock_irqsave(&list->lock, flags); 1761 skb_queue_walk(list, list_skb) { 1762 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { 1763 this = list_skb; 1764 break; 1765 } 1766 } 1767 if (this) { 1768 atomic_dec(&iucv->skbs_in_xmit); 1769 __skb_unlink(this, list); 1770 } 1771 1772 spin_unlock_irqrestore(&list->lock, flags); 1773 1774 if (this) { 1775 kfree_skb(this); 1776 /* wake up any process waiting for sending */ 1777 iucv_sock_wake_msglim(sk); 1778 } 1779 1780 if (sk->sk_state == IUCV_CLOSING) { 1781 if (atomic_read(&iucv->skbs_in_xmit) == 0) { 1782 sk->sk_state = IUCV_CLOSED; 1783 sk->sk_state_change(sk); 1784 } 1785 } 1786 bh_unlock_sock(sk); 1787 1788 } 1789 1790 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) 1791 { 1792 struct sock *sk = path->private; 1793 1794 if (sk->sk_state == IUCV_CLOSED) 1795 return; 1796 1797 bh_lock_sock(sk); 1798 iucv_sever_path(sk, 1); 1799 sk->sk_state = IUCV_DISCONN; 1800 1801 sk->sk_state_change(sk); 1802 bh_unlock_sock(sk); 1803 } 1804 1805 /* called if the other communication side shuts down its RECV direction; 1806 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. 1807 */ 1808 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) 1809 { 1810 struct sock *sk = path->private; 1811 1812 bh_lock_sock(sk); 1813 if (sk->sk_state != IUCV_CLOSED) { 1814 sk->sk_shutdown |= SEND_SHUTDOWN; 1815 sk->sk_state_change(sk); 1816 } 1817 bh_unlock_sock(sk); 1818 } 1819 1820 /***************** HiperSockets transport callbacks ********************/ 1821 static void afiucv_swap_src_dest(struct sk_buff *skb) 1822 { 1823 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); 1824 char tmpID[8]; 1825 char tmpName[8]; 1826 1827 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 1828 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 1829 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 1830 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 1831 memcpy(tmpID, trans_hdr->srcUserID, 8); 1832 memcpy(tmpName, trans_hdr->srcAppName, 8); 1833 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); 1834 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); 1835 memcpy(trans_hdr->destUserID, tmpID, 8); 1836 memcpy(trans_hdr->destAppName, tmpName, 8); 1837 skb_push(skb, ETH_HLEN); 1838 memset(skb->data, 0, ETH_HLEN); 1839 } 1840 1841 /** 1842 * afiucv_hs_callback_syn - react on received SYN 1843 **/ 1844 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) 1845 { 1846 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); 1847 struct sock *nsk; 1848 struct iucv_sock *iucv, *niucv; 1849 int err; 1850 1851 iucv = iucv_sk(sk); 1852 if (!iucv) { 1853 /* no sock - connection refused */ 1854 afiucv_swap_src_dest(skb); 1855 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1856 err = dev_queue_xmit(skb); 1857 goto out; 1858 } 1859 1860 nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0); 1861 bh_lock_sock(sk); 1862 if ((sk->sk_state != IUCV_LISTEN) || 1863 sk_acceptq_is_full(sk) || 1864 !nsk) { 1865 /* error on server socket - connection refused */ 1866 afiucv_swap_src_dest(skb); 1867 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1868 err = dev_queue_xmit(skb); 1869 iucv_sock_kill(nsk); 1870 bh_unlock_sock(sk); 1871 goto out; 1872 } 1873 1874 niucv = iucv_sk(nsk); 1875 iucv_sock_init(nsk, sk); 1876 niucv->transport = AF_IUCV_TRANS_HIPER; 1877 niucv->msglimit = iucv->msglimit; 1878 if (!trans_hdr->window) 1879 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; 1880 else 1881 niucv->msglimit_peer = trans_hdr->window; 1882 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); 1883 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); 1884 memcpy(niucv->src_name, iucv->src_name, 8); 1885 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1886 nsk->sk_bound_dev_if = sk->sk_bound_dev_if; 1887 niucv->hs_dev = iucv->hs_dev; 1888 dev_hold(niucv->hs_dev); 1889 afiucv_swap_src_dest(skb); 1890 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; 1891 trans_hdr->window = niucv->msglimit; 1892 /* if receiver acks the xmit connection is established */ 1893 err = dev_queue_xmit(skb); 1894 if (!err) { 1895 iucv_accept_enqueue(sk, nsk); 1896 nsk->sk_state = IUCV_CONNECTED; 1897 sk->sk_data_ready(sk); 1898 } else 1899 iucv_sock_kill(nsk); 1900 bh_unlock_sock(sk); 1901 1902 out: 1903 return NET_RX_SUCCESS; 1904 } 1905 1906 /** 1907 * afiucv_hs_callback_synack() - react on received SYN-ACK 1908 **/ 1909 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) 1910 { 1911 struct iucv_sock *iucv = iucv_sk(sk); 1912 1913 if (!iucv) 1914 goto out; 1915 if (sk->sk_state != IUCV_BOUND) 1916 goto out; 1917 bh_lock_sock(sk); 1918 iucv->msglimit_peer = iucv_trans_hdr(skb)->window; 1919 sk->sk_state = IUCV_CONNECTED; 1920 sk->sk_state_change(sk); 1921 bh_unlock_sock(sk); 1922 out: 1923 kfree_skb(skb); 1924 return NET_RX_SUCCESS; 1925 } 1926 1927 /** 1928 * afiucv_hs_callback_synfin() - react on received SYN_FIN 1929 **/ 1930 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) 1931 { 1932 struct iucv_sock *iucv = iucv_sk(sk); 1933 1934 if (!iucv) 1935 goto out; 1936 if (sk->sk_state != IUCV_BOUND) 1937 goto out; 1938 bh_lock_sock(sk); 1939 sk->sk_state = IUCV_DISCONN; 1940 sk->sk_state_change(sk); 1941 bh_unlock_sock(sk); 1942 out: 1943 kfree_skb(skb); 1944 return NET_RX_SUCCESS; 1945 } 1946 1947 /** 1948 * afiucv_hs_callback_fin() - react on received FIN 1949 **/ 1950 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) 1951 { 1952 struct iucv_sock *iucv = iucv_sk(sk); 1953 1954 /* other end of connection closed */ 1955 if (!iucv) 1956 goto out; 1957 bh_lock_sock(sk); 1958 if (sk->sk_state == IUCV_CONNECTED) { 1959 sk->sk_state = IUCV_DISCONN; 1960 sk->sk_state_change(sk); 1961 } 1962 bh_unlock_sock(sk); 1963 out: 1964 kfree_skb(skb); 1965 return NET_RX_SUCCESS; 1966 } 1967 1968 /** 1969 * afiucv_hs_callback_win() - react on received WIN 1970 **/ 1971 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) 1972 { 1973 struct iucv_sock *iucv = iucv_sk(sk); 1974 1975 if (!iucv) 1976 return NET_RX_SUCCESS; 1977 1978 if (sk->sk_state != IUCV_CONNECTED) 1979 return NET_RX_SUCCESS; 1980 1981 atomic_sub(iucv_trans_hdr(skb)->window, &iucv->msg_sent); 1982 iucv_sock_wake_msglim(sk); 1983 return NET_RX_SUCCESS; 1984 } 1985 1986 /** 1987 * afiucv_hs_callback_rx() - react on received data 1988 **/ 1989 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) 1990 { 1991 struct iucv_sock *iucv = iucv_sk(sk); 1992 1993 if (!iucv) { 1994 kfree_skb(skb); 1995 return NET_RX_SUCCESS; 1996 } 1997 1998 if (sk->sk_state != IUCV_CONNECTED) { 1999 kfree_skb(skb); 2000 return NET_RX_SUCCESS; 2001 } 2002 2003 if (sk->sk_shutdown & RCV_SHUTDOWN) { 2004 kfree_skb(skb); 2005 return NET_RX_SUCCESS; 2006 } 2007 2008 /* write stuff from iucv_msg to skb cb */ 2009 skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); 2010 skb_reset_transport_header(skb); 2011 skb_reset_network_header(skb); 2012 IUCV_SKB_CB(skb)->offset = 0; 2013 if (sk_filter(sk, skb)) { 2014 atomic_inc(&sk->sk_drops); /* skb rejected by filter */ 2015 kfree_skb(skb); 2016 return NET_RX_SUCCESS; 2017 } 2018 2019 spin_lock(&iucv->message_q.lock); 2020 if (skb_queue_empty(&iucv->backlog_skb_q)) { 2021 if (__sock_queue_rcv_skb(sk, skb)) 2022 /* handle rcv queue full */ 2023 skb_queue_tail(&iucv->backlog_skb_q, skb); 2024 } else 2025 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 2026 spin_unlock(&iucv->message_q.lock); 2027 return NET_RX_SUCCESS; 2028 } 2029 2030 /** 2031 * afiucv_hs_rcv() - base function for arriving data through HiperSockets 2032 * transport 2033 * called from netif RX softirq 2034 **/ 2035 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 2036 struct packet_type *pt, struct net_device *orig_dev) 2037 { 2038 struct sock *sk; 2039 struct iucv_sock *iucv; 2040 struct af_iucv_trans_hdr *trans_hdr; 2041 int err = NET_RX_SUCCESS; 2042 char nullstring[8]; 2043 2044 if (!pskb_may_pull(skb, sizeof(*trans_hdr))) { 2045 kfree_skb(skb); 2046 return NET_RX_SUCCESS; 2047 } 2048 2049 trans_hdr = iucv_trans_hdr(skb); 2050 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 2051 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 2052 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 2053 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 2054 memset(nullstring, 0, sizeof(nullstring)); 2055 iucv = NULL; 2056 sk = NULL; 2057 read_lock(&iucv_sk_list.lock); 2058 sk_for_each(sk, &iucv_sk_list.head) { 2059 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { 2060 if ((!memcmp(&iucv_sk(sk)->src_name, 2061 trans_hdr->destAppName, 8)) && 2062 (!memcmp(&iucv_sk(sk)->src_user_id, 2063 trans_hdr->destUserID, 8)) && 2064 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && 2065 (!memcmp(&iucv_sk(sk)->dst_user_id, 2066 nullstring, 8))) { 2067 iucv = iucv_sk(sk); 2068 break; 2069 } 2070 } else { 2071 if ((!memcmp(&iucv_sk(sk)->src_name, 2072 trans_hdr->destAppName, 8)) && 2073 (!memcmp(&iucv_sk(sk)->src_user_id, 2074 trans_hdr->destUserID, 8)) && 2075 (!memcmp(&iucv_sk(sk)->dst_name, 2076 trans_hdr->srcAppName, 8)) && 2077 (!memcmp(&iucv_sk(sk)->dst_user_id, 2078 trans_hdr->srcUserID, 8))) { 2079 iucv = iucv_sk(sk); 2080 break; 2081 } 2082 } 2083 } 2084 read_unlock(&iucv_sk_list.lock); 2085 if (!iucv) 2086 sk = NULL; 2087 2088 /* no sock 2089 how should we send with no sock 2090 1) send without sock no send rc checking? 2091 2) introduce default sock to handle this cases 2092 2093 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case 2094 data -> send FIN 2095 SYN|ACK, SYN|FIN, FIN -> no action? */ 2096 2097 switch (trans_hdr->flags) { 2098 case AF_IUCV_FLAG_SYN: 2099 /* connect request */ 2100 err = afiucv_hs_callback_syn(sk, skb); 2101 break; 2102 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): 2103 /* connect request confirmed */ 2104 err = afiucv_hs_callback_synack(sk, skb); 2105 break; 2106 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): 2107 /* connect request refused */ 2108 err = afiucv_hs_callback_synfin(sk, skb); 2109 break; 2110 case (AF_IUCV_FLAG_FIN): 2111 /* close request */ 2112 err = afiucv_hs_callback_fin(sk, skb); 2113 break; 2114 case (AF_IUCV_FLAG_WIN): 2115 err = afiucv_hs_callback_win(sk, skb); 2116 if (skb->len == sizeof(struct af_iucv_trans_hdr)) { 2117 kfree_skb(skb); 2118 break; 2119 } 2120 fallthrough; /* and receive non-zero length data */ 2121 case (AF_IUCV_FLAG_SHT): 2122 /* shutdown request */ 2123 fallthrough; /* and receive zero length data */ 2124 case 0: 2125 /* plain data frame */ 2126 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class; 2127 err = afiucv_hs_callback_rx(sk, skb); 2128 break; 2129 default: 2130 kfree_skb(skb); 2131 } 2132 2133 return err; 2134 } 2135 2136 /** 2137 * afiucv_hs_callback_txnotify() - handle send notifications from HiperSockets 2138 * transport 2139 **/ 2140 static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify n) 2141 { 2142 struct iucv_sock *iucv = iucv_sk(sk); 2143 2144 if (sock_flag(sk, SOCK_ZAPPED)) 2145 return; 2146 2147 switch (n) { 2148 case TX_NOTIFY_OK: 2149 atomic_dec(&iucv->skbs_in_xmit); 2150 iucv_sock_wake_msglim(sk); 2151 break; 2152 case TX_NOTIFY_PENDING: 2153 atomic_inc(&iucv->pendings); 2154 break; 2155 case TX_NOTIFY_DELAYED_OK: 2156 atomic_dec(&iucv->skbs_in_xmit); 2157 if (atomic_dec_return(&iucv->pendings) <= 0) 2158 iucv_sock_wake_msglim(sk); 2159 break; 2160 default: 2161 atomic_dec(&iucv->skbs_in_xmit); 2162 if (sk->sk_state == IUCV_CONNECTED) { 2163 sk->sk_state = IUCV_DISCONN; 2164 sk->sk_state_change(sk); 2165 } 2166 } 2167 2168 if (sk->sk_state == IUCV_CLOSING) { 2169 if (atomic_read(&iucv->skbs_in_xmit) == 0) { 2170 sk->sk_state = IUCV_CLOSED; 2171 sk->sk_state_change(sk); 2172 } 2173 } 2174 } 2175 2176 /* 2177 * afiucv_netdev_event: handle netdev notifier chain events 2178 */ 2179 static int afiucv_netdev_event(struct notifier_block *this, 2180 unsigned long event, void *ptr) 2181 { 2182 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 2183 struct sock *sk; 2184 struct iucv_sock *iucv; 2185 2186 switch (event) { 2187 case NETDEV_REBOOT: 2188 case NETDEV_GOING_DOWN: 2189 sk_for_each(sk, &iucv_sk_list.head) { 2190 iucv = iucv_sk(sk); 2191 if ((iucv->hs_dev == event_dev) && 2192 (sk->sk_state == IUCV_CONNECTED)) { 2193 if (event == NETDEV_GOING_DOWN) 2194 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 2195 sk->sk_state = IUCV_DISCONN; 2196 sk->sk_state_change(sk); 2197 } 2198 } 2199 break; 2200 case NETDEV_DOWN: 2201 case NETDEV_UNREGISTER: 2202 default: 2203 break; 2204 } 2205 return NOTIFY_DONE; 2206 } 2207 2208 static struct notifier_block afiucv_netdev_notifier = { 2209 .notifier_call = afiucv_netdev_event, 2210 }; 2211 2212 static const struct proto_ops iucv_sock_ops = { 2213 .family = PF_IUCV, 2214 .owner = THIS_MODULE, 2215 .release = iucv_sock_release, 2216 .bind = iucv_sock_bind, 2217 .connect = iucv_sock_connect, 2218 .listen = iucv_sock_listen, 2219 .accept = iucv_sock_accept, 2220 .getname = iucv_sock_getname, 2221 .sendmsg = iucv_sock_sendmsg, 2222 .recvmsg = iucv_sock_recvmsg, 2223 .poll = iucv_sock_poll, 2224 .ioctl = sock_no_ioctl, 2225 .mmap = sock_no_mmap, 2226 .socketpair = sock_no_socketpair, 2227 .shutdown = iucv_sock_shutdown, 2228 .setsockopt = iucv_sock_setsockopt, 2229 .getsockopt = iucv_sock_getsockopt, 2230 }; 2231 2232 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, 2233 int kern) 2234 { 2235 struct sock *sk; 2236 2237 if (protocol && protocol != PF_IUCV) 2238 return -EPROTONOSUPPORT; 2239 2240 sock->state = SS_UNCONNECTED; 2241 2242 switch (sock->type) { 2243 case SOCK_STREAM: 2244 case SOCK_SEQPACKET: 2245 /* currently, proto ops can handle both sk types */ 2246 sock->ops = &iucv_sock_ops; 2247 break; 2248 default: 2249 return -ESOCKTNOSUPPORT; 2250 } 2251 2252 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern); 2253 if (!sk) 2254 return -ENOMEM; 2255 2256 iucv_sock_init(sk, NULL); 2257 2258 return 0; 2259 } 2260 2261 static const struct net_proto_family iucv_sock_family_ops = { 2262 .family = AF_IUCV, 2263 .owner = THIS_MODULE, 2264 .create = iucv_sock_create, 2265 }; 2266 2267 static struct packet_type iucv_packet_type = { 2268 .type = cpu_to_be16(ETH_P_AF_IUCV), 2269 .func = afiucv_hs_rcv, 2270 }; 2271 2272 static int afiucv_iucv_init(void) 2273 { 2274 return pr_iucv->iucv_register(&af_iucv_handler, 0); 2275 } 2276 2277 static void afiucv_iucv_exit(void) 2278 { 2279 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2280 } 2281 2282 static int __init afiucv_init(void) 2283 { 2284 int err; 2285 2286 if (MACHINE_IS_VM) { 2287 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); 2288 if (unlikely(err)) { 2289 WARN_ON(err); 2290 err = -EPROTONOSUPPORT; 2291 goto out; 2292 } 2293 2294 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); 2295 if (!pr_iucv) { 2296 printk(KERN_WARNING "iucv_if lookup failed\n"); 2297 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2298 } 2299 } else { 2300 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2301 pr_iucv = NULL; 2302 } 2303 2304 err = proto_register(&iucv_proto, 0); 2305 if (err) 2306 goto out; 2307 err = sock_register(&iucv_sock_family_ops); 2308 if (err) 2309 goto out_proto; 2310 2311 if (pr_iucv) { 2312 err = afiucv_iucv_init(); 2313 if (err) 2314 goto out_sock; 2315 } 2316 2317 err = register_netdevice_notifier(&afiucv_netdev_notifier); 2318 if (err) 2319 goto out_notifier; 2320 2321 dev_add_pack(&iucv_packet_type); 2322 return 0; 2323 2324 out_notifier: 2325 if (pr_iucv) 2326 afiucv_iucv_exit(); 2327 out_sock: 2328 sock_unregister(PF_IUCV); 2329 out_proto: 2330 proto_unregister(&iucv_proto); 2331 out: 2332 if (pr_iucv) 2333 symbol_put(iucv_if); 2334 return err; 2335 } 2336 2337 static void __exit afiucv_exit(void) 2338 { 2339 if (pr_iucv) { 2340 afiucv_iucv_exit(); 2341 symbol_put(iucv_if); 2342 } 2343 2344 unregister_netdevice_notifier(&afiucv_netdev_notifier); 2345 dev_remove_pack(&iucv_packet_type); 2346 sock_unregister(PF_IUCV); 2347 proto_unregister(&iucv_proto); 2348 } 2349 2350 module_init(afiucv_init); 2351 module_exit(afiucv_exit); 2352 2353 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); 2354 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); 2355 MODULE_VERSION(VERSION); 2356 MODULE_LICENSE("GPL"); 2357 MODULE_ALIAS_NETPROTO(PF_IUCV); 2358