1 /* 2 * IUCV protocol stack for Linux on zSeries 3 * 4 * Copyright IBM Corp. 2006, 2009 5 * 6 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com> 7 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com> 8 * PM functions: 9 * Ursula Braun <ursula.braun@de.ibm.com> 10 */ 11 12 #define KMSG_COMPONENT "af_iucv" 13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 14 15 #include <linux/module.h> 16 #include <linux/types.h> 17 #include <linux/list.h> 18 #include <linux/errno.h> 19 #include <linux/kernel.h> 20 #include <linux/sched.h> 21 #include <linux/slab.h> 22 #include <linux/skbuff.h> 23 #include <linux/init.h> 24 #include <linux/poll.h> 25 #include <net/sock.h> 26 #include <asm/ebcdic.h> 27 #include <asm/cpcmd.h> 28 #include <linux/kmod.h> 29 30 #include <net/iucv/af_iucv.h> 31 32 #define VERSION "1.2" 33 34 static char iucv_userid[80]; 35 36 static const struct proto_ops iucv_sock_ops; 37 38 static struct proto iucv_proto = { 39 .name = "AF_IUCV", 40 .owner = THIS_MODULE, 41 .obj_size = sizeof(struct iucv_sock), 42 }; 43 44 static struct iucv_interface *pr_iucv; 45 46 /* special AF_IUCV IPRM messages */ 47 static const u8 iprm_shutdown[8] = 48 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; 49 50 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class)) 51 52 /* macros to set/get socket control buffer at correct offset */ 53 #define CB_TAG(skb) ((skb)->cb) /* iucv message tag */ 54 #define CB_TAG_LEN (sizeof(((struct iucv_message *) 0)->tag)) 55 #define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */ 56 #define CB_TRGCLS_LEN (TRGCLS_SIZE) 57 58 #define __iucv_sock_wait(sk, condition, timeo, ret) \ 59 do { \ 60 DEFINE_WAIT(__wait); \ 61 long __timeo = timeo; \ 62 ret = 0; \ 63 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ 64 while (!(condition)) { \ 65 if (!__timeo) { \ 66 ret = -EAGAIN; \ 67 break; \ 68 } \ 69 if (signal_pending(current)) { \ 70 ret = sock_intr_errno(__timeo); \ 71 break; \ 72 } \ 73 release_sock(sk); \ 74 __timeo = schedule_timeout(__timeo); \ 75 lock_sock(sk); \ 76 ret = sock_error(sk); \ 77 if (ret) \ 78 break; \ 79 } \ 80 finish_wait(sk_sleep(sk), &__wait); \ 81 } while (0) 82 83 #define iucv_sock_wait(sk, condition, timeo) \ 84 ({ \ 85 int __ret = 0; \ 86 if (!(condition)) \ 87 __iucv_sock_wait(sk, condition, timeo, __ret); \ 88 __ret; \ 89 }) 90 91 static void iucv_sock_kill(struct sock *sk); 92 static void iucv_sock_close(struct sock *sk); 93 static void iucv_sever_path(struct sock *, int); 94 95 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 96 struct packet_type *pt, struct net_device *orig_dev); 97 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 98 struct sk_buff *skb, u8 flags); 99 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify); 100 101 /* Call Back functions */ 102 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); 103 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); 104 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]); 105 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], 106 u8 ipuser[16]); 107 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]); 108 static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]); 109 110 static struct iucv_sock_list iucv_sk_list = { 111 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), 112 .autobind_name = ATOMIC_INIT(0) 113 }; 114 115 static struct iucv_handler af_iucv_handler = { 116 .path_pending = iucv_callback_connreq, 117 .path_complete = iucv_callback_connack, 118 .path_severed = iucv_callback_connrej, 119 .message_pending = iucv_callback_rx, 120 .message_complete = iucv_callback_txdone, 121 .path_quiesced = iucv_callback_shutdown, 122 }; 123 124 static inline void high_nmcpy(unsigned char *dst, char *src) 125 { 126 memcpy(dst, src, 8); 127 } 128 129 static inline void low_nmcpy(unsigned char *dst, char *src) 130 { 131 memcpy(&dst[8], src, 8); 132 } 133 134 static int afiucv_pm_prepare(struct device *dev) 135 { 136 #ifdef CONFIG_PM_DEBUG 137 printk(KERN_WARNING "afiucv_pm_prepare\n"); 138 #endif 139 return 0; 140 } 141 142 static void afiucv_pm_complete(struct device *dev) 143 { 144 #ifdef CONFIG_PM_DEBUG 145 printk(KERN_WARNING "afiucv_pm_complete\n"); 146 #endif 147 } 148 149 /** 150 * afiucv_pm_freeze() - Freeze PM callback 151 * @dev: AFIUCV dummy device 152 * 153 * Sever all established IUCV communication pathes 154 */ 155 static int afiucv_pm_freeze(struct device *dev) 156 { 157 struct iucv_sock *iucv; 158 struct sock *sk; 159 struct hlist_node *node; 160 int err = 0; 161 162 #ifdef CONFIG_PM_DEBUG 163 printk(KERN_WARNING "afiucv_pm_freeze\n"); 164 #endif 165 read_lock(&iucv_sk_list.lock); 166 sk_for_each(sk, node, &iucv_sk_list.head) { 167 iucv = iucv_sk(sk); 168 switch (sk->sk_state) { 169 case IUCV_DISCONN: 170 case IUCV_CLOSING: 171 case IUCV_CONNECTED: 172 iucv_sever_path(sk, 0); 173 break; 174 case IUCV_OPEN: 175 case IUCV_BOUND: 176 case IUCV_LISTEN: 177 case IUCV_CLOSED: 178 default: 179 break; 180 } 181 skb_queue_purge(&iucv->send_skb_q); 182 skb_queue_purge(&iucv->backlog_skb_q); 183 } 184 read_unlock(&iucv_sk_list.lock); 185 return err; 186 } 187 188 /** 189 * afiucv_pm_restore_thaw() - Thaw and restore PM callback 190 * @dev: AFIUCV dummy device 191 * 192 * socket clean up after freeze 193 */ 194 static int afiucv_pm_restore_thaw(struct device *dev) 195 { 196 struct sock *sk; 197 struct hlist_node *node; 198 199 #ifdef CONFIG_PM_DEBUG 200 printk(KERN_WARNING "afiucv_pm_restore_thaw\n"); 201 #endif 202 read_lock(&iucv_sk_list.lock); 203 sk_for_each(sk, node, &iucv_sk_list.head) { 204 switch (sk->sk_state) { 205 case IUCV_CONNECTED: 206 sk->sk_err = EPIPE; 207 sk->sk_state = IUCV_DISCONN; 208 sk->sk_state_change(sk); 209 break; 210 case IUCV_DISCONN: 211 case IUCV_CLOSING: 212 case IUCV_LISTEN: 213 case IUCV_BOUND: 214 case IUCV_OPEN: 215 default: 216 break; 217 } 218 } 219 read_unlock(&iucv_sk_list.lock); 220 return 0; 221 } 222 223 static const struct dev_pm_ops afiucv_pm_ops = { 224 .prepare = afiucv_pm_prepare, 225 .complete = afiucv_pm_complete, 226 .freeze = afiucv_pm_freeze, 227 .thaw = afiucv_pm_restore_thaw, 228 .restore = afiucv_pm_restore_thaw, 229 }; 230 231 static struct device_driver af_iucv_driver = { 232 .owner = THIS_MODULE, 233 .name = "afiucv", 234 .bus = NULL, 235 .pm = &afiucv_pm_ops, 236 }; 237 238 /* dummy device used as trigger for PM functions */ 239 static struct device *af_iucv_dev; 240 241 /** 242 * iucv_msg_length() - Returns the length of an iucv message. 243 * @msg: Pointer to struct iucv_message, MUST NOT be NULL 244 * 245 * The function returns the length of the specified iucv message @msg of data 246 * stored in a buffer and of data stored in the parameter list (PRMDATA). 247 * 248 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket 249 * data: 250 * PRMDATA[0..6] socket data (max 7 bytes); 251 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) 252 * 253 * The socket data length is computed by subtracting the socket data length 254 * value from 0xFF. 255 * If the socket data len is greater 7, then PRMDATA can be used for special 256 * notifications (see iucv_sock_shutdown); and further, 257 * if the socket data len is > 7, the function returns 8. 258 * 259 * Use this function to allocate socket buffers to store iucv message data. 260 */ 261 static inline size_t iucv_msg_length(struct iucv_message *msg) 262 { 263 size_t datalen; 264 265 if (msg->flags & IUCV_IPRMDATA) { 266 datalen = 0xff - msg->rmmsg[7]; 267 return (datalen < 8) ? datalen : 8; 268 } 269 return msg->length; 270 } 271 272 /** 273 * iucv_sock_in_state() - check for specific states 274 * @sk: sock structure 275 * @state: first iucv sk state 276 * @state: second iucv sk state 277 * 278 * Returns true if the socket in either in the first or second state. 279 */ 280 static int iucv_sock_in_state(struct sock *sk, int state, int state2) 281 { 282 return (sk->sk_state == state || sk->sk_state == state2); 283 } 284 285 /** 286 * iucv_below_msglim() - function to check if messages can be sent 287 * @sk: sock structure 288 * 289 * Returns true if the send queue length is lower than the message limit. 290 * Always returns true if the socket is not connected (no iucv path for 291 * checking the message limit). 292 */ 293 static inline int iucv_below_msglim(struct sock *sk) 294 { 295 struct iucv_sock *iucv = iucv_sk(sk); 296 297 if (sk->sk_state != IUCV_CONNECTED) 298 return 1; 299 if (iucv->transport == AF_IUCV_TRANS_IUCV) 300 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); 301 else 302 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && 303 (atomic_read(&iucv->pendings) <= 0)); 304 } 305 306 /** 307 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit 308 */ 309 static void iucv_sock_wake_msglim(struct sock *sk) 310 { 311 struct socket_wq *wq; 312 313 rcu_read_lock(); 314 wq = rcu_dereference(sk->sk_wq); 315 if (wq_has_sleeper(wq)) 316 wake_up_interruptible_all(&wq->wait); 317 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 318 rcu_read_unlock(); 319 } 320 321 /** 322 * afiucv_hs_send() - send a message through HiperSockets transport 323 */ 324 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 325 struct sk_buff *skb, u8 flags) 326 { 327 struct iucv_sock *iucv = iucv_sk(sock); 328 struct af_iucv_trans_hdr *phs_hdr; 329 struct sk_buff *nskb; 330 int err, confirm_recv = 0; 331 332 memset(skb->head, 0, ETH_HLEN); 333 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb, 334 sizeof(struct af_iucv_trans_hdr)); 335 skb_reset_mac_header(skb); 336 skb_reset_network_header(skb); 337 skb_push(skb, ETH_HLEN); 338 skb_reset_mac_header(skb); 339 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr)); 340 341 phs_hdr->magic = ETH_P_AF_IUCV; 342 phs_hdr->version = 1; 343 phs_hdr->flags = flags; 344 if (flags == AF_IUCV_FLAG_SYN) 345 phs_hdr->window = iucv->msglimit; 346 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { 347 confirm_recv = atomic_read(&iucv->msg_recv); 348 phs_hdr->window = confirm_recv; 349 if (confirm_recv) 350 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; 351 } 352 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); 353 memcpy(phs_hdr->destAppName, iucv->dst_name, 8); 354 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); 355 memcpy(phs_hdr->srcAppName, iucv->src_name, 8); 356 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); 357 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); 358 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); 359 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); 360 if (imsg) 361 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); 362 363 skb->dev = iucv->hs_dev; 364 if (!skb->dev) 365 return -ENODEV; 366 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) 367 return -ENETDOWN; 368 if (skb->len > skb->dev->mtu) { 369 if (sock->sk_type == SOCK_SEQPACKET) 370 return -EMSGSIZE; 371 else 372 skb_trim(skb, skb->dev->mtu); 373 } 374 skb->protocol = ETH_P_AF_IUCV; 375 nskb = skb_clone(skb, GFP_ATOMIC); 376 if (!nskb) 377 return -ENOMEM; 378 skb_queue_tail(&iucv->send_skb_q, nskb); 379 err = dev_queue_xmit(skb); 380 if (net_xmit_eval(err)) { 381 skb_unlink(nskb, &iucv->send_skb_q); 382 kfree_skb(nskb); 383 } else { 384 atomic_sub(confirm_recv, &iucv->msg_recv); 385 WARN_ON(atomic_read(&iucv->msg_recv) < 0); 386 } 387 return net_xmit_eval(err); 388 } 389 390 static struct sock *__iucv_get_sock_by_name(char *nm) 391 { 392 struct sock *sk; 393 struct hlist_node *node; 394 395 sk_for_each(sk, node, &iucv_sk_list.head) 396 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) 397 return sk; 398 399 return NULL; 400 } 401 402 static void iucv_sock_destruct(struct sock *sk) 403 { 404 skb_queue_purge(&sk->sk_receive_queue); 405 skb_queue_purge(&sk->sk_error_queue); 406 407 sk_mem_reclaim(sk); 408 409 if (!sock_flag(sk, SOCK_DEAD)) { 410 pr_err("Attempt to release alive iucv socket %p\n", sk); 411 return; 412 } 413 414 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 415 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 416 WARN_ON(sk->sk_wmem_queued); 417 WARN_ON(sk->sk_forward_alloc); 418 } 419 420 /* Cleanup Listen */ 421 static void iucv_sock_cleanup_listen(struct sock *parent) 422 { 423 struct sock *sk; 424 425 /* Close non-accepted connections */ 426 while ((sk = iucv_accept_dequeue(parent, NULL))) { 427 iucv_sock_close(sk); 428 iucv_sock_kill(sk); 429 } 430 431 parent->sk_state = IUCV_CLOSED; 432 } 433 434 /* Kill socket (only if zapped and orphaned) */ 435 static void iucv_sock_kill(struct sock *sk) 436 { 437 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) 438 return; 439 440 iucv_sock_unlink(&iucv_sk_list, sk); 441 sock_set_flag(sk, SOCK_DEAD); 442 sock_put(sk); 443 } 444 445 /* Terminate an IUCV path */ 446 static void iucv_sever_path(struct sock *sk, int with_user_data) 447 { 448 unsigned char user_data[16]; 449 struct iucv_sock *iucv = iucv_sk(sk); 450 struct iucv_path *path = iucv->path; 451 452 if (iucv->path) { 453 iucv->path = NULL; 454 if (with_user_data) { 455 low_nmcpy(user_data, iucv->src_name); 456 high_nmcpy(user_data, iucv->dst_name); 457 ASCEBC(user_data, sizeof(user_data)); 458 pr_iucv->path_sever(path, user_data); 459 } else 460 pr_iucv->path_sever(path, NULL); 461 iucv_path_free(path); 462 } 463 } 464 465 /* Send FIN through an IUCV socket for HIPER transport */ 466 static int iucv_send_ctrl(struct sock *sk, u8 flags) 467 { 468 int err = 0; 469 int blen; 470 struct sk_buff *skb; 471 472 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; 473 skb = sock_alloc_send_skb(sk, blen, 1, &err); 474 if (skb) { 475 skb_reserve(skb, blen); 476 err = afiucv_hs_send(NULL, sk, skb, flags); 477 } 478 return err; 479 } 480 481 /* Close an IUCV socket */ 482 static void iucv_sock_close(struct sock *sk) 483 { 484 struct iucv_sock *iucv = iucv_sk(sk); 485 unsigned long timeo; 486 int err = 0; 487 488 lock_sock(sk); 489 490 switch (sk->sk_state) { 491 case IUCV_LISTEN: 492 iucv_sock_cleanup_listen(sk); 493 break; 494 495 case IUCV_CONNECTED: 496 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 497 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 498 sk->sk_state = IUCV_DISCONN; 499 sk->sk_state_change(sk); 500 } 501 case IUCV_DISCONN: /* fall through */ 502 sk->sk_state = IUCV_CLOSING; 503 sk->sk_state_change(sk); 504 505 if (!err && !skb_queue_empty(&iucv->send_skb_q)) { 506 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) 507 timeo = sk->sk_lingertime; 508 else 509 timeo = IUCV_DISCONN_TIMEOUT; 510 iucv_sock_wait(sk, 511 iucv_sock_in_state(sk, IUCV_CLOSED, 0), 512 timeo); 513 } 514 515 case IUCV_CLOSING: /* fall through */ 516 sk->sk_state = IUCV_CLOSED; 517 sk->sk_state_change(sk); 518 519 sk->sk_err = ECONNRESET; 520 sk->sk_state_change(sk); 521 522 skb_queue_purge(&iucv->send_skb_q); 523 skb_queue_purge(&iucv->backlog_skb_q); 524 525 default: /* fall through */ 526 iucv_sever_path(sk, 1); 527 } 528 529 if (iucv->hs_dev) { 530 dev_put(iucv->hs_dev); 531 iucv->hs_dev = NULL; 532 sk->sk_bound_dev_if = 0; 533 } 534 535 /* mark socket for deletion by iucv_sock_kill() */ 536 sock_set_flag(sk, SOCK_ZAPPED); 537 538 release_sock(sk); 539 } 540 541 static void iucv_sock_init(struct sock *sk, struct sock *parent) 542 { 543 if (parent) 544 sk->sk_type = parent->sk_type; 545 } 546 547 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) 548 { 549 struct sock *sk; 550 struct iucv_sock *iucv; 551 552 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto); 553 if (!sk) 554 return NULL; 555 iucv = iucv_sk(sk); 556 557 sock_init_data(sock, sk); 558 INIT_LIST_HEAD(&iucv->accept_q); 559 spin_lock_init(&iucv->accept_q_lock); 560 skb_queue_head_init(&iucv->send_skb_q); 561 INIT_LIST_HEAD(&iucv->message_q.list); 562 spin_lock_init(&iucv->message_q.lock); 563 skb_queue_head_init(&iucv->backlog_skb_q); 564 iucv->send_tag = 0; 565 atomic_set(&iucv->pendings, 0); 566 iucv->flags = 0; 567 iucv->msglimit = 0; 568 atomic_set(&iucv->msg_sent, 0); 569 atomic_set(&iucv->msg_recv, 0); 570 iucv->path = NULL; 571 iucv->sk_txnotify = afiucv_hs_callback_txnotify; 572 memset(&iucv->src_user_id , 0, 32); 573 if (pr_iucv) 574 iucv->transport = AF_IUCV_TRANS_IUCV; 575 else 576 iucv->transport = AF_IUCV_TRANS_HIPER; 577 578 sk->sk_destruct = iucv_sock_destruct; 579 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; 580 sk->sk_allocation = GFP_DMA; 581 582 sock_reset_flag(sk, SOCK_ZAPPED); 583 584 sk->sk_protocol = proto; 585 sk->sk_state = IUCV_OPEN; 586 587 iucv_sock_link(&iucv_sk_list, sk); 588 return sk; 589 } 590 591 /* Create an IUCV socket */ 592 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, 593 int kern) 594 { 595 struct sock *sk; 596 597 if (protocol && protocol != PF_IUCV) 598 return -EPROTONOSUPPORT; 599 600 sock->state = SS_UNCONNECTED; 601 602 switch (sock->type) { 603 case SOCK_STREAM: 604 sock->ops = &iucv_sock_ops; 605 break; 606 case SOCK_SEQPACKET: 607 /* currently, proto ops can handle both sk types */ 608 sock->ops = &iucv_sock_ops; 609 break; 610 default: 611 return -ESOCKTNOSUPPORT; 612 } 613 614 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL); 615 if (!sk) 616 return -ENOMEM; 617 618 iucv_sock_init(sk, NULL); 619 620 return 0; 621 } 622 623 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) 624 { 625 write_lock_bh(&l->lock); 626 sk_add_node(sk, &l->head); 627 write_unlock_bh(&l->lock); 628 } 629 630 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) 631 { 632 write_lock_bh(&l->lock); 633 sk_del_node_init(sk); 634 write_unlock_bh(&l->lock); 635 } 636 637 void iucv_accept_enqueue(struct sock *parent, struct sock *sk) 638 { 639 unsigned long flags; 640 struct iucv_sock *par = iucv_sk(parent); 641 642 sock_hold(sk); 643 spin_lock_irqsave(&par->accept_q_lock, flags); 644 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); 645 spin_unlock_irqrestore(&par->accept_q_lock, flags); 646 iucv_sk(sk)->parent = parent; 647 sk_acceptq_added(parent); 648 } 649 650 void iucv_accept_unlink(struct sock *sk) 651 { 652 unsigned long flags; 653 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); 654 655 spin_lock_irqsave(&par->accept_q_lock, flags); 656 list_del_init(&iucv_sk(sk)->accept_q); 657 spin_unlock_irqrestore(&par->accept_q_lock, flags); 658 sk_acceptq_removed(iucv_sk(sk)->parent); 659 iucv_sk(sk)->parent = NULL; 660 sock_put(sk); 661 } 662 663 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) 664 { 665 struct iucv_sock *isk, *n; 666 struct sock *sk; 667 668 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 669 sk = (struct sock *) isk; 670 lock_sock(sk); 671 672 if (sk->sk_state == IUCV_CLOSED) { 673 iucv_accept_unlink(sk); 674 release_sock(sk); 675 continue; 676 } 677 678 if (sk->sk_state == IUCV_CONNECTED || 679 sk->sk_state == IUCV_DISCONN || 680 !newsock) { 681 iucv_accept_unlink(sk); 682 if (newsock) 683 sock_graft(sk, newsock); 684 685 release_sock(sk); 686 return sk; 687 } 688 689 release_sock(sk); 690 } 691 return NULL; 692 } 693 694 /* Bind an unbound socket */ 695 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, 696 int addr_len) 697 { 698 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 699 struct sock *sk = sock->sk; 700 struct iucv_sock *iucv; 701 int err = 0; 702 struct net_device *dev; 703 char uid[9]; 704 705 /* Verify the input sockaddr */ 706 if (!addr || addr->sa_family != AF_IUCV) 707 return -EINVAL; 708 709 lock_sock(sk); 710 if (sk->sk_state != IUCV_OPEN) { 711 err = -EBADFD; 712 goto done; 713 } 714 715 write_lock_bh(&iucv_sk_list.lock); 716 717 iucv = iucv_sk(sk); 718 if (__iucv_get_sock_by_name(sa->siucv_name)) { 719 err = -EADDRINUSE; 720 goto done_unlock; 721 } 722 if (iucv->path) 723 goto done_unlock; 724 725 /* Bind the socket */ 726 if (pr_iucv) 727 if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) 728 goto vm_bind; /* VM IUCV transport */ 729 730 /* try hiper transport */ 731 memcpy(uid, sa->siucv_user_id, sizeof(uid)); 732 ASCEBC(uid, 8); 733 rcu_read_lock(); 734 for_each_netdev_rcu(&init_net, dev) { 735 if (!memcmp(dev->perm_addr, uid, 8)) { 736 memcpy(iucv->src_name, sa->siucv_name, 8); 737 memcpy(iucv->src_user_id, sa->siucv_user_id, 8); 738 sk->sk_bound_dev_if = dev->ifindex; 739 iucv->hs_dev = dev; 740 dev_hold(dev); 741 sk->sk_state = IUCV_BOUND; 742 iucv->transport = AF_IUCV_TRANS_HIPER; 743 if (!iucv->msglimit) 744 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; 745 rcu_read_unlock(); 746 goto done_unlock; 747 } 748 } 749 rcu_read_unlock(); 750 vm_bind: 751 if (pr_iucv) { 752 /* use local userid for backward compat */ 753 memcpy(iucv->src_name, sa->siucv_name, 8); 754 memcpy(iucv->src_user_id, iucv_userid, 8); 755 sk->sk_state = IUCV_BOUND; 756 iucv->transport = AF_IUCV_TRANS_IUCV; 757 if (!iucv->msglimit) 758 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 759 goto done_unlock; 760 } 761 /* found no dev to bind */ 762 err = -ENODEV; 763 done_unlock: 764 /* Release the socket list lock */ 765 write_unlock_bh(&iucv_sk_list.lock); 766 done: 767 release_sock(sk); 768 return err; 769 } 770 771 /* Automatically bind an unbound socket */ 772 static int iucv_sock_autobind(struct sock *sk) 773 { 774 struct iucv_sock *iucv = iucv_sk(sk); 775 char name[12]; 776 int err = 0; 777 778 if (unlikely(!pr_iucv)) 779 return -EPROTO; 780 781 memcpy(iucv->src_user_id, iucv_userid, 8); 782 783 write_lock_bh(&iucv_sk_list.lock); 784 785 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); 786 while (__iucv_get_sock_by_name(name)) { 787 sprintf(name, "%08x", 788 atomic_inc_return(&iucv_sk_list.autobind_name)); 789 } 790 791 write_unlock_bh(&iucv_sk_list.lock); 792 793 memcpy(&iucv->src_name, name, 8); 794 795 if (!iucv->msglimit) 796 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 797 798 return err; 799 } 800 801 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) 802 { 803 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 804 struct sock *sk = sock->sk; 805 struct iucv_sock *iucv = iucv_sk(sk); 806 unsigned char user_data[16]; 807 int err; 808 809 high_nmcpy(user_data, sa->siucv_name); 810 low_nmcpy(user_data, iucv->src_name); 811 ASCEBC(user_data, sizeof(user_data)); 812 813 /* Create path. */ 814 iucv->path = iucv_path_alloc(iucv->msglimit, 815 IUCV_IPRMDATA, GFP_KERNEL); 816 if (!iucv->path) { 817 err = -ENOMEM; 818 goto done; 819 } 820 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, 821 sa->siucv_user_id, NULL, user_data, 822 sk); 823 if (err) { 824 iucv_path_free(iucv->path); 825 iucv->path = NULL; 826 switch (err) { 827 case 0x0b: /* Target communicator is not logged on */ 828 err = -ENETUNREACH; 829 break; 830 case 0x0d: /* Max connections for this guest exceeded */ 831 case 0x0e: /* Max connections for target guest exceeded */ 832 err = -EAGAIN; 833 break; 834 case 0x0f: /* Missing IUCV authorization */ 835 err = -EACCES; 836 break; 837 default: 838 err = -ECONNREFUSED; 839 break; 840 } 841 } 842 done: 843 return err; 844 } 845 846 /* Connect an unconnected socket */ 847 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, 848 int alen, int flags) 849 { 850 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 851 struct sock *sk = sock->sk; 852 struct iucv_sock *iucv = iucv_sk(sk); 853 int err; 854 855 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) 856 return -EINVAL; 857 858 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) 859 return -EBADFD; 860 861 if (sk->sk_state == IUCV_OPEN && 862 iucv->transport == AF_IUCV_TRANS_HIPER) 863 return -EBADFD; /* explicit bind required */ 864 865 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) 866 return -EINVAL; 867 868 if (sk->sk_state == IUCV_OPEN) { 869 err = iucv_sock_autobind(sk); 870 if (unlikely(err)) 871 return err; 872 } 873 874 lock_sock(sk); 875 876 /* Set the destination information */ 877 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); 878 memcpy(iucv->dst_name, sa->siucv_name, 8); 879 880 if (iucv->transport == AF_IUCV_TRANS_HIPER) 881 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); 882 else 883 err = afiucv_path_connect(sock, addr); 884 if (err) 885 goto done; 886 887 if (sk->sk_state != IUCV_CONNECTED) 888 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, 889 IUCV_DISCONN), 890 sock_sndtimeo(sk, flags & O_NONBLOCK)); 891 892 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) 893 err = -ECONNREFUSED; 894 895 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) 896 iucv_sever_path(sk, 0); 897 898 done: 899 release_sock(sk); 900 return err; 901 } 902 903 /* Move a socket into listening state. */ 904 static int iucv_sock_listen(struct socket *sock, int backlog) 905 { 906 struct sock *sk = sock->sk; 907 int err; 908 909 lock_sock(sk); 910 911 err = -EINVAL; 912 if (sk->sk_state != IUCV_BOUND) 913 goto done; 914 915 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) 916 goto done; 917 918 sk->sk_max_ack_backlog = backlog; 919 sk->sk_ack_backlog = 0; 920 sk->sk_state = IUCV_LISTEN; 921 err = 0; 922 923 done: 924 release_sock(sk); 925 return err; 926 } 927 928 /* Accept a pending connection */ 929 static int iucv_sock_accept(struct socket *sock, struct socket *newsock, 930 int flags) 931 { 932 DECLARE_WAITQUEUE(wait, current); 933 struct sock *sk = sock->sk, *nsk; 934 long timeo; 935 int err = 0; 936 937 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 938 939 if (sk->sk_state != IUCV_LISTEN) { 940 err = -EBADFD; 941 goto done; 942 } 943 944 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 945 946 /* Wait for an incoming connection */ 947 add_wait_queue_exclusive(sk_sleep(sk), &wait); 948 while (!(nsk = iucv_accept_dequeue(sk, newsock))) { 949 set_current_state(TASK_INTERRUPTIBLE); 950 if (!timeo) { 951 err = -EAGAIN; 952 break; 953 } 954 955 release_sock(sk); 956 timeo = schedule_timeout(timeo); 957 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 958 959 if (sk->sk_state != IUCV_LISTEN) { 960 err = -EBADFD; 961 break; 962 } 963 964 if (signal_pending(current)) { 965 err = sock_intr_errno(timeo); 966 break; 967 } 968 } 969 970 set_current_state(TASK_RUNNING); 971 remove_wait_queue(sk_sleep(sk), &wait); 972 973 if (err) 974 goto done; 975 976 newsock->state = SS_CONNECTED; 977 978 done: 979 release_sock(sk); 980 return err; 981 } 982 983 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, 984 int *len, int peer) 985 { 986 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; 987 struct sock *sk = sock->sk; 988 struct iucv_sock *iucv = iucv_sk(sk); 989 990 addr->sa_family = AF_IUCV; 991 *len = sizeof(struct sockaddr_iucv); 992 993 if (peer) { 994 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); 995 memcpy(siucv->siucv_name, iucv->dst_name, 8); 996 } else { 997 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); 998 memcpy(siucv->siucv_name, iucv->src_name, 8); 999 } 1000 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); 1001 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); 1002 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); 1003 1004 return 0; 1005 } 1006 1007 /** 1008 * iucv_send_iprm() - Send socket data in parameter list of an iucv message. 1009 * @path: IUCV path 1010 * @msg: Pointer to a struct iucv_message 1011 * @skb: The socket data to send, skb->len MUST BE <= 7 1012 * 1013 * Send the socket data in the parameter list in the iucv message 1014 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter 1015 * list and the socket data len at index 7 (last byte). 1016 * See also iucv_msg_length(). 1017 * 1018 * Returns the error code from the iucv_message_send() call. 1019 */ 1020 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, 1021 struct sk_buff *skb) 1022 { 1023 u8 prmdata[8]; 1024 1025 memcpy(prmdata, (void *) skb->data, skb->len); 1026 prmdata[7] = 0xff - (u8) skb->len; 1027 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, 1028 (void *) prmdata, 8); 1029 } 1030 1031 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, 1032 struct msghdr *msg, size_t len) 1033 { 1034 struct sock *sk = sock->sk; 1035 struct iucv_sock *iucv = iucv_sk(sk); 1036 struct sk_buff *skb; 1037 struct iucv_message txmsg; 1038 struct cmsghdr *cmsg; 1039 int cmsg_done; 1040 long timeo; 1041 char user_id[9]; 1042 char appl_id[9]; 1043 int err; 1044 int noblock = msg->msg_flags & MSG_DONTWAIT; 1045 1046 err = sock_error(sk); 1047 if (err) 1048 return err; 1049 1050 if (msg->msg_flags & MSG_OOB) 1051 return -EOPNOTSUPP; 1052 1053 /* SOCK_SEQPACKET: we do not support segmented records */ 1054 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) 1055 return -EOPNOTSUPP; 1056 1057 lock_sock(sk); 1058 1059 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1060 err = -EPIPE; 1061 goto out; 1062 } 1063 1064 /* Return if the socket is not in connected state */ 1065 if (sk->sk_state != IUCV_CONNECTED) { 1066 err = -ENOTCONN; 1067 goto out; 1068 } 1069 1070 /* initialize defaults */ 1071 cmsg_done = 0; /* check for duplicate headers */ 1072 txmsg.class = 0; 1073 1074 /* iterate over control messages */ 1075 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; 1076 cmsg = CMSG_NXTHDR(msg, cmsg)) { 1077 1078 if (!CMSG_OK(msg, cmsg)) { 1079 err = -EINVAL; 1080 goto out; 1081 } 1082 1083 if (cmsg->cmsg_level != SOL_IUCV) 1084 continue; 1085 1086 if (cmsg->cmsg_type & cmsg_done) { 1087 err = -EINVAL; 1088 goto out; 1089 } 1090 cmsg_done |= cmsg->cmsg_type; 1091 1092 switch (cmsg->cmsg_type) { 1093 case SCM_IUCV_TRGCLS: 1094 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { 1095 err = -EINVAL; 1096 goto out; 1097 } 1098 1099 /* set iucv message target class */ 1100 memcpy(&txmsg.class, 1101 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); 1102 1103 break; 1104 1105 default: 1106 err = -EINVAL; 1107 goto out; 1108 break; 1109 } 1110 } 1111 1112 /* allocate one skb for each iucv message: 1113 * this is fine for SOCK_SEQPACKET (unless we want to support 1114 * segmented records using the MSG_EOR flag), but 1115 * for SOCK_STREAM we might want to improve it in future */ 1116 if (iucv->transport == AF_IUCV_TRANS_HIPER) 1117 skb = sock_alloc_send_skb(sk, 1118 len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN, 1119 noblock, &err); 1120 else 1121 skb = sock_alloc_send_skb(sk, len, noblock, &err); 1122 if (!skb) { 1123 err = -ENOMEM; 1124 goto out; 1125 } 1126 if (iucv->transport == AF_IUCV_TRANS_HIPER) 1127 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN); 1128 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { 1129 err = -EFAULT; 1130 goto fail; 1131 } 1132 1133 /* wait if outstanding messages for iucv path has reached */ 1134 timeo = sock_sndtimeo(sk, noblock); 1135 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); 1136 if (err) 1137 goto fail; 1138 1139 /* return -ECONNRESET if the socket is no longer connected */ 1140 if (sk->sk_state != IUCV_CONNECTED) { 1141 err = -ECONNRESET; 1142 goto fail; 1143 } 1144 1145 /* increment and save iucv message tag for msg_completion cbk */ 1146 txmsg.tag = iucv->send_tag++; 1147 memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN); 1148 1149 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1150 atomic_inc(&iucv->msg_sent); 1151 err = afiucv_hs_send(&txmsg, sk, skb, 0); 1152 if (err) { 1153 atomic_dec(&iucv->msg_sent); 1154 goto fail; 1155 } 1156 goto release; 1157 } 1158 skb_queue_tail(&iucv->send_skb_q, skb); 1159 1160 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) 1161 && skb->len <= 7) { 1162 err = iucv_send_iprm(iucv->path, &txmsg, skb); 1163 1164 /* on success: there is no message_complete callback 1165 * for an IPRMDATA msg; remove skb from send queue */ 1166 if (err == 0) { 1167 skb_unlink(skb, &iucv->send_skb_q); 1168 kfree_skb(skb); 1169 } 1170 1171 /* this error should never happen since the 1172 * IUCV_IPRMDATA path flag is set... sever path */ 1173 if (err == 0x15) { 1174 pr_iucv->path_sever(iucv->path, NULL); 1175 skb_unlink(skb, &iucv->send_skb_q); 1176 err = -EPIPE; 1177 goto fail; 1178 } 1179 } else 1180 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0, 1181 (void *) skb->data, skb->len); 1182 if (err) { 1183 if (err == 3) { 1184 user_id[8] = 0; 1185 memcpy(user_id, iucv->dst_user_id, 8); 1186 appl_id[8] = 0; 1187 memcpy(appl_id, iucv->dst_name, 8); 1188 pr_err("Application %s on z/VM guest %s" 1189 " exceeds message limit\n", 1190 appl_id, user_id); 1191 err = -EAGAIN; 1192 } else 1193 err = -EPIPE; 1194 skb_unlink(skb, &iucv->send_skb_q); 1195 goto fail; 1196 } 1197 1198 release: 1199 release_sock(sk); 1200 return len; 1201 1202 fail: 1203 kfree_skb(skb); 1204 out: 1205 release_sock(sk); 1206 return err; 1207 } 1208 1209 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's 1210 * 1211 * Locking: must be called with message_q.lock held 1212 */ 1213 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) 1214 { 1215 int dataleft, size, copied = 0; 1216 struct sk_buff *nskb; 1217 1218 dataleft = len; 1219 while (dataleft) { 1220 if (dataleft >= sk->sk_rcvbuf / 4) 1221 size = sk->sk_rcvbuf / 4; 1222 else 1223 size = dataleft; 1224 1225 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); 1226 if (!nskb) 1227 return -ENOMEM; 1228 1229 /* copy target class to control buffer of new skb */ 1230 memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN); 1231 1232 /* copy data fragment */ 1233 memcpy(nskb->data, skb->data + copied, size); 1234 copied += size; 1235 dataleft -= size; 1236 1237 skb_reset_transport_header(nskb); 1238 skb_reset_network_header(nskb); 1239 nskb->len = size; 1240 1241 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); 1242 } 1243 1244 return 0; 1245 } 1246 1247 /* iucv_process_message() - Receive a single outstanding IUCV message 1248 * 1249 * Locking: must be called with message_q.lock held 1250 */ 1251 static void iucv_process_message(struct sock *sk, struct sk_buff *skb, 1252 struct iucv_path *path, 1253 struct iucv_message *msg) 1254 { 1255 int rc; 1256 unsigned int len; 1257 1258 len = iucv_msg_length(msg); 1259 1260 /* store msg target class in the second 4 bytes of skb ctrl buffer */ 1261 /* Note: the first 4 bytes are reserved for msg tag */ 1262 memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN); 1263 1264 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ 1265 if ((msg->flags & IUCV_IPRMDATA) && len > 7) { 1266 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { 1267 skb->data = NULL; 1268 skb->len = 0; 1269 } 1270 } else { 1271 rc = pr_iucv->message_receive(path, msg, 1272 msg->flags & IUCV_IPRMDATA, 1273 skb->data, len, NULL); 1274 if (rc) { 1275 kfree_skb(skb); 1276 return; 1277 } 1278 /* we need to fragment iucv messages for SOCK_STREAM only; 1279 * for SOCK_SEQPACKET, it is only relevant if we support 1280 * record segmentation using MSG_EOR (see also recvmsg()) */ 1281 if (sk->sk_type == SOCK_STREAM && 1282 skb->truesize >= sk->sk_rcvbuf / 4) { 1283 rc = iucv_fragment_skb(sk, skb, len); 1284 kfree_skb(skb); 1285 skb = NULL; 1286 if (rc) { 1287 pr_iucv->path_sever(path, NULL); 1288 return; 1289 } 1290 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); 1291 } else { 1292 skb_reset_transport_header(skb); 1293 skb_reset_network_header(skb); 1294 skb->len = len; 1295 } 1296 } 1297 1298 if (sock_queue_rcv_skb(sk, skb)) 1299 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); 1300 } 1301 1302 /* iucv_process_message_q() - Process outstanding IUCV messages 1303 * 1304 * Locking: must be called with message_q.lock held 1305 */ 1306 static void iucv_process_message_q(struct sock *sk) 1307 { 1308 struct iucv_sock *iucv = iucv_sk(sk); 1309 struct sk_buff *skb; 1310 struct sock_msg_q *p, *n; 1311 1312 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 1313 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); 1314 if (!skb) 1315 break; 1316 iucv_process_message(sk, skb, p->path, &p->msg); 1317 list_del(&p->list); 1318 kfree(p); 1319 if (!skb_queue_empty(&iucv->backlog_skb_q)) 1320 break; 1321 } 1322 } 1323 1324 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, 1325 struct msghdr *msg, size_t len, int flags) 1326 { 1327 int noblock = flags & MSG_DONTWAIT; 1328 struct sock *sk = sock->sk; 1329 struct iucv_sock *iucv = iucv_sk(sk); 1330 unsigned int copied, rlen; 1331 struct sk_buff *skb, *rskb, *cskb; 1332 int err = 0; 1333 1334 if ((sk->sk_state == IUCV_DISCONN) && 1335 skb_queue_empty(&iucv->backlog_skb_q) && 1336 skb_queue_empty(&sk->sk_receive_queue) && 1337 list_empty(&iucv->message_q.list)) 1338 return 0; 1339 1340 if (flags & (MSG_OOB)) 1341 return -EOPNOTSUPP; 1342 1343 /* receive/dequeue next skb: 1344 * the function understands MSG_PEEK and, thus, does not dequeue skb */ 1345 skb = skb_recv_datagram(sk, flags, noblock, &err); 1346 if (!skb) { 1347 if (sk->sk_shutdown & RCV_SHUTDOWN) 1348 return 0; 1349 return err; 1350 } 1351 1352 rlen = skb->len; /* real length of skb */ 1353 copied = min_t(unsigned int, rlen, len); 1354 if (!rlen) 1355 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; 1356 1357 cskb = skb; 1358 if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) { 1359 if (!(flags & MSG_PEEK)) 1360 skb_queue_head(&sk->sk_receive_queue, skb); 1361 return -EFAULT; 1362 } 1363 1364 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ 1365 if (sk->sk_type == SOCK_SEQPACKET) { 1366 if (copied < rlen) 1367 msg->msg_flags |= MSG_TRUNC; 1368 /* each iucv message contains a complete record */ 1369 msg->msg_flags |= MSG_EOR; 1370 } 1371 1372 /* create control message to store iucv msg target class: 1373 * get the trgcls from the control buffer of the skb due to 1374 * fragmentation of original iucv message. */ 1375 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, 1376 CB_TRGCLS_LEN, CB_TRGCLS(skb)); 1377 if (err) { 1378 if (!(flags & MSG_PEEK)) 1379 skb_queue_head(&sk->sk_receive_queue, skb); 1380 return err; 1381 } 1382 1383 /* Mark read part of skb as used */ 1384 if (!(flags & MSG_PEEK)) { 1385 1386 /* SOCK_STREAM: re-queue skb if it contains unreceived data */ 1387 if (sk->sk_type == SOCK_STREAM) { 1388 skb_pull(skb, copied); 1389 if (skb->len) { 1390 skb_queue_head(&sk->sk_receive_queue, skb); 1391 goto done; 1392 } 1393 } 1394 1395 kfree_skb(skb); 1396 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1397 atomic_inc(&iucv->msg_recv); 1398 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { 1399 WARN_ON(1); 1400 iucv_sock_close(sk); 1401 return -EFAULT; 1402 } 1403 } 1404 1405 /* Queue backlog skbs */ 1406 spin_lock_bh(&iucv->message_q.lock); 1407 rskb = skb_dequeue(&iucv->backlog_skb_q); 1408 while (rskb) { 1409 if (sock_queue_rcv_skb(sk, rskb)) { 1410 skb_queue_head(&iucv->backlog_skb_q, 1411 rskb); 1412 break; 1413 } else { 1414 rskb = skb_dequeue(&iucv->backlog_skb_q); 1415 } 1416 } 1417 if (skb_queue_empty(&iucv->backlog_skb_q)) { 1418 if (!list_empty(&iucv->message_q.list)) 1419 iucv_process_message_q(sk); 1420 if (atomic_read(&iucv->msg_recv) >= 1421 iucv->msglimit / 2) { 1422 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); 1423 if (err) { 1424 sk->sk_state = IUCV_DISCONN; 1425 sk->sk_state_change(sk); 1426 } 1427 } 1428 } 1429 spin_unlock_bh(&iucv->message_q.lock); 1430 } 1431 1432 done: 1433 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ 1434 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) 1435 copied = rlen; 1436 1437 return copied; 1438 } 1439 1440 static inline unsigned int iucv_accept_poll(struct sock *parent) 1441 { 1442 struct iucv_sock *isk, *n; 1443 struct sock *sk; 1444 1445 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 1446 sk = (struct sock *) isk; 1447 1448 if (sk->sk_state == IUCV_CONNECTED) 1449 return POLLIN | POLLRDNORM; 1450 } 1451 1452 return 0; 1453 } 1454 1455 unsigned int iucv_sock_poll(struct file *file, struct socket *sock, 1456 poll_table *wait) 1457 { 1458 struct sock *sk = sock->sk; 1459 unsigned int mask = 0; 1460 1461 sock_poll_wait(file, sk_sleep(sk), wait); 1462 1463 if (sk->sk_state == IUCV_LISTEN) 1464 return iucv_accept_poll(sk); 1465 1466 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) 1467 mask |= POLLERR; 1468 1469 if (sk->sk_shutdown & RCV_SHUTDOWN) 1470 mask |= POLLRDHUP; 1471 1472 if (sk->sk_shutdown == SHUTDOWN_MASK) 1473 mask |= POLLHUP; 1474 1475 if (!skb_queue_empty(&sk->sk_receive_queue) || 1476 (sk->sk_shutdown & RCV_SHUTDOWN)) 1477 mask |= POLLIN | POLLRDNORM; 1478 1479 if (sk->sk_state == IUCV_CLOSED) 1480 mask |= POLLHUP; 1481 1482 if (sk->sk_state == IUCV_DISCONN) 1483 mask |= POLLIN; 1484 1485 if (sock_writeable(sk) && iucv_below_msglim(sk)) 1486 mask |= POLLOUT | POLLWRNORM | POLLWRBAND; 1487 else 1488 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1489 1490 return mask; 1491 } 1492 1493 static int iucv_sock_shutdown(struct socket *sock, int how) 1494 { 1495 struct sock *sk = sock->sk; 1496 struct iucv_sock *iucv = iucv_sk(sk); 1497 struct iucv_message txmsg; 1498 int err = 0; 1499 1500 how++; 1501 1502 if ((how & ~SHUTDOWN_MASK) || !how) 1503 return -EINVAL; 1504 1505 lock_sock(sk); 1506 switch (sk->sk_state) { 1507 case IUCV_LISTEN: 1508 case IUCV_DISCONN: 1509 case IUCV_CLOSING: 1510 case IUCV_CLOSED: 1511 err = -ENOTCONN; 1512 goto fail; 1513 default: 1514 break; 1515 } 1516 1517 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { 1518 if (iucv->transport == AF_IUCV_TRANS_IUCV) { 1519 txmsg.class = 0; 1520 txmsg.tag = 0; 1521 err = pr_iucv->message_send(iucv->path, &txmsg, 1522 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); 1523 if (err) { 1524 switch (err) { 1525 case 1: 1526 err = -ENOTCONN; 1527 break; 1528 case 2: 1529 err = -ECONNRESET; 1530 break; 1531 default: 1532 err = -ENOTCONN; 1533 break; 1534 } 1535 } 1536 } else 1537 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); 1538 } 1539 1540 sk->sk_shutdown |= how; 1541 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { 1542 if (iucv->transport == AF_IUCV_TRANS_IUCV) { 1543 err = pr_iucv->path_quiesce(iucv->path, NULL); 1544 if (err) 1545 err = -ENOTCONN; 1546 /* skb_queue_purge(&sk->sk_receive_queue); */ 1547 } 1548 skb_queue_purge(&sk->sk_receive_queue); 1549 } 1550 1551 /* Wake up anyone sleeping in poll */ 1552 sk->sk_state_change(sk); 1553 1554 fail: 1555 release_sock(sk); 1556 return err; 1557 } 1558 1559 static int iucv_sock_release(struct socket *sock) 1560 { 1561 struct sock *sk = sock->sk; 1562 int err = 0; 1563 1564 if (!sk) 1565 return 0; 1566 1567 iucv_sock_close(sk); 1568 1569 sock_orphan(sk); 1570 iucv_sock_kill(sk); 1571 return err; 1572 } 1573 1574 /* getsockopt and setsockopt */ 1575 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, 1576 char __user *optval, unsigned int optlen) 1577 { 1578 struct sock *sk = sock->sk; 1579 struct iucv_sock *iucv = iucv_sk(sk); 1580 int val; 1581 int rc; 1582 1583 if (level != SOL_IUCV) 1584 return -ENOPROTOOPT; 1585 1586 if (optlen < sizeof(int)) 1587 return -EINVAL; 1588 1589 if (get_user(val, (int __user *) optval)) 1590 return -EFAULT; 1591 1592 rc = 0; 1593 1594 lock_sock(sk); 1595 switch (optname) { 1596 case SO_IPRMDATA_MSG: 1597 if (val) 1598 iucv->flags |= IUCV_IPRMDATA; 1599 else 1600 iucv->flags &= ~IUCV_IPRMDATA; 1601 break; 1602 case SO_MSGLIMIT: 1603 switch (sk->sk_state) { 1604 case IUCV_OPEN: 1605 case IUCV_BOUND: 1606 if (val < 1 || val > (u16)(~0)) 1607 rc = -EINVAL; 1608 else 1609 iucv->msglimit = val; 1610 break; 1611 default: 1612 rc = -EINVAL; 1613 break; 1614 } 1615 break; 1616 default: 1617 rc = -ENOPROTOOPT; 1618 break; 1619 } 1620 release_sock(sk); 1621 1622 return rc; 1623 } 1624 1625 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, 1626 char __user *optval, int __user *optlen) 1627 { 1628 struct sock *sk = sock->sk; 1629 struct iucv_sock *iucv = iucv_sk(sk); 1630 unsigned int val; 1631 int len; 1632 1633 if (level != SOL_IUCV) 1634 return -ENOPROTOOPT; 1635 1636 if (get_user(len, optlen)) 1637 return -EFAULT; 1638 1639 if (len < 0) 1640 return -EINVAL; 1641 1642 len = min_t(unsigned int, len, sizeof(int)); 1643 1644 switch (optname) { 1645 case SO_IPRMDATA_MSG: 1646 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; 1647 break; 1648 case SO_MSGLIMIT: 1649 lock_sock(sk); 1650 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ 1651 : iucv->msglimit; /* default */ 1652 release_sock(sk); 1653 break; 1654 case SO_MSGSIZE: 1655 if (sk->sk_state == IUCV_OPEN) 1656 return -EBADFD; 1657 val = (iucv->hs_dev) ? iucv->hs_dev->mtu - 1658 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : 1659 0x7fffffff; 1660 break; 1661 default: 1662 return -ENOPROTOOPT; 1663 } 1664 1665 if (put_user(len, optlen)) 1666 return -EFAULT; 1667 if (copy_to_user(optval, &val, len)) 1668 return -EFAULT; 1669 1670 return 0; 1671 } 1672 1673 1674 /* Callback wrappers - called from iucv base support */ 1675 static int iucv_callback_connreq(struct iucv_path *path, 1676 u8 ipvmid[8], u8 ipuser[16]) 1677 { 1678 unsigned char user_data[16]; 1679 unsigned char nuser_data[16]; 1680 unsigned char src_name[8]; 1681 struct hlist_node *node; 1682 struct sock *sk, *nsk; 1683 struct iucv_sock *iucv, *niucv; 1684 int err; 1685 1686 memcpy(src_name, ipuser, 8); 1687 EBCASC(src_name, 8); 1688 /* Find out if this path belongs to af_iucv. */ 1689 read_lock(&iucv_sk_list.lock); 1690 iucv = NULL; 1691 sk = NULL; 1692 sk_for_each(sk, node, &iucv_sk_list.head) 1693 if (sk->sk_state == IUCV_LISTEN && 1694 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { 1695 /* 1696 * Found a listening socket with 1697 * src_name == ipuser[0-7]. 1698 */ 1699 iucv = iucv_sk(sk); 1700 break; 1701 } 1702 read_unlock(&iucv_sk_list.lock); 1703 if (!iucv) 1704 /* No socket found, not one of our paths. */ 1705 return -EINVAL; 1706 1707 bh_lock_sock(sk); 1708 1709 /* Check if parent socket is listening */ 1710 low_nmcpy(user_data, iucv->src_name); 1711 high_nmcpy(user_data, iucv->dst_name); 1712 ASCEBC(user_data, sizeof(user_data)); 1713 if (sk->sk_state != IUCV_LISTEN) { 1714 err = pr_iucv->path_sever(path, user_data); 1715 iucv_path_free(path); 1716 goto fail; 1717 } 1718 1719 /* Check for backlog size */ 1720 if (sk_acceptq_is_full(sk)) { 1721 err = pr_iucv->path_sever(path, user_data); 1722 iucv_path_free(path); 1723 goto fail; 1724 } 1725 1726 /* Create the new socket */ 1727 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); 1728 if (!nsk) { 1729 err = pr_iucv->path_sever(path, user_data); 1730 iucv_path_free(path); 1731 goto fail; 1732 } 1733 1734 niucv = iucv_sk(nsk); 1735 iucv_sock_init(nsk, sk); 1736 1737 /* Set the new iucv_sock */ 1738 memcpy(niucv->dst_name, ipuser + 8, 8); 1739 EBCASC(niucv->dst_name, 8); 1740 memcpy(niucv->dst_user_id, ipvmid, 8); 1741 memcpy(niucv->src_name, iucv->src_name, 8); 1742 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1743 niucv->path = path; 1744 1745 /* Call iucv_accept */ 1746 high_nmcpy(nuser_data, ipuser + 8); 1747 memcpy(nuser_data + 8, niucv->src_name, 8); 1748 ASCEBC(nuser_data + 8, 8); 1749 1750 /* set message limit for path based on msglimit of accepting socket */ 1751 niucv->msglimit = iucv->msglimit; 1752 path->msglim = iucv->msglimit; 1753 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); 1754 if (err) { 1755 iucv_sever_path(nsk, 1); 1756 iucv_sock_kill(nsk); 1757 goto fail; 1758 } 1759 1760 iucv_accept_enqueue(sk, nsk); 1761 1762 /* Wake up accept */ 1763 nsk->sk_state = IUCV_CONNECTED; 1764 sk->sk_data_ready(sk, 1); 1765 err = 0; 1766 fail: 1767 bh_unlock_sock(sk); 1768 return 0; 1769 } 1770 1771 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) 1772 { 1773 struct sock *sk = path->private; 1774 1775 sk->sk_state = IUCV_CONNECTED; 1776 sk->sk_state_change(sk); 1777 } 1778 1779 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) 1780 { 1781 struct sock *sk = path->private; 1782 struct iucv_sock *iucv = iucv_sk(sk); 1783 struct sk_buff *skb; 1784 struct sock_msg_q *save_msg; 1785 int len; 1786 1787 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1788 pr_iucv->message_reject(path, msg); 1789 return; 1790 } 1791 1792 spin_lock(&iucv->message_q.lock); 1793 1794 if (!list_empty(&iucv->message_q.list) || 1795 !skb_queue_empty(&iucv->backlog_skb_q)) 1796 goto save_message; 1797 1798 len = atomic_read(&sk->sk_rmem_alloc); 1799 len += SKB_TRUESIZE(iucv_msg_length(msg)); 1800 if (len > sk->sk_rcvbuf) 1801 goto save_message; 1802 1803 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); 1804 if (!skb) 1805 goto save_message; 1806 1807 iucv_process_message(sk, skb, path, msg); 1808 goto out_unlock; 1809 1810 save_message: 1811 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); 1812 if (!save_msg) 1813 goto out_unlock; 1814 save_msg->path = path; 1815 save_msg->msg = *msg; 1816 1817 list_add_tail(&save_msg->list, &iucv->message_q.list); 1818 1819 out_unlock: 1820 spin_unlock(&iucv->message_q.lock); 1821 } 1822 1823 static void iucv_callback_txdone(struct iucv_path *path, 1824 struct iucv_message *msg) 1825 { 1826 struct sock *sk = path->private; 1827 struct sk_buff *this = NULL; 1828 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; 1829 struct sk_buff *list_skb = list->next; 1830 unsigned long flags; 1831 1832 bh_lock_sock(sk); 1833 if (!skb_queue_empty(list)) { 1834 spin_lock_irqsave(&list->lock, flags); 1835 1836 while (list_skb != (struct sk_buff *)list) { 1837 if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) { 1838 this = list_skb; 1839 break; 1840 } 1841 list_skb = list_skb->next; 1842 } 1843 if (this) 1844 __skb_unlink(this, list); 1845 1846 spin_unlock_irqrestore(&list->lock, flags); 1847 1848 if (this) { 1849 kfree_skb(this); 1850 /* wake up any process waiting for sending */ 1851 iucv_sock_wake_msglim(sk); 1852 } 1853 } 1854 1855 if (sk->sk_state == IUCV_CLOSING) { 1856 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 1857 sk->sk_state = IUCV_CLOSED; 1858 sk->sk_state_change(sk); 1859 } 1860 } 1861 bh_unlock_sock(sk); 1862 1863 } 1864 1865 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) 1866 { 1867 struct sock *sk = path->private; 1868 1869 if (sk->sk_state == IUCV_CLOSED) 1870 return; 1871 1872 bh_lock_sock(sk); 1873 iucv_sever_path(sk, 1); 1874 sk->sk_state = IUCV_DISCONN; 1875 1876 sk->sk_state_change(sk); 1877 bh_unlock_sock(sk); 1878 } 1879 1880 /* called if the other communication side shuts down its RECV direction; 1881 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. 1882 */ 1883 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) 1884 { 1885 struct sock *sk = path->private; 1886 1887 bh_lock_sock(sk); 1888 if (sk->sk_state != IUCV_CLOSED) { 1889 sk->sk_shutdown |= SEND_SHUTDOWN; 1890 sk->sk_state_change(sk); 1891 } 1892 bh_unlock_sock(sk); 1893 } 1894 1895 /***************** HiperSockets transport callbacks ********************/ 1896 static void afiucv_swap_src_dest(struct sk_buff *skb) 1897 { 1898 struct af_iucv_trans_hdr *trans_hdr = 1899 (struct af_iucv_trans_hdr *)skb->data; 1900 char tmpID[8]; 1901 char tmpName[8]; 1902 1903 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 1904 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 1905 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 1906 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 1907 memcpy(tmpID, trans_hdr->srcUserID, 8); 1908 memcpy(tmpName, trans_hdr->srcAppName, 8); 1909 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); 1910 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); 1911 memcpy(trans_hdr->destUserID, tmpID, 8); 1912 memcpy(trans_hdr->destAppName, tmpName, 8); 1913 skb_push(skb, ETH_HLEN); 1914 memset(skb->data, 0, ETH_HLEN); 1915 } 1916 1917 /** 1918 * afiucv_hs_callback_syn - react on received SYN 1919 **/ 1920 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) 1921 { 1922 struct sock *nsk; 1923 struct iucv_sock *iucv, *niucv; 1924 struct af_iucv_trans_hdr *trans_hdr; 1925 int err; 1926 1927 iucv = iucv_sk(sk); 1928 trans_hdr = (struct af_iucv_trans_hdr *)skb->data; 1929 if (!iucv) { 1930 /* no sock - connection refused */ 1931 afiucv_swap_src_dest(skb); 1932 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1933 err = dev_queue_xmit(skb); 1934 goto out; 1935 } 1936 1937 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); 1938 bh_lock_sock(sk); 1939 if ((sk->sk_state != IUCV_LISTEN) || 1940 sk_acceptq_is_full(sk) || 1941 !nsk) { 1942 /* error on server socket - connection refused */ 1943 if (nsk) 1944 sk_free(nsk); 1945 afiucv_swap_src_dest(skb); 1946 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1947 err = dev_queue_xmit(skb); 1948 bh_unlock_sock(sk); 1949 goto out; 1950 } 1951 1952 niucv = iucv_sk(nsk); 1953 iucv_sock_init(nsk, sk); 1954 niucv->transport = AF_IUCV_TRANS_HIPER; 1955 niucv->msglimit = iucv->msglimit; 1956 if (!trans_hdr->window) 1957 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; 1958 else 1959 niucv->msglimit_peer = trans_hdr->window; 1960 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); 1961 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); 1962 memcpy(niucv->src_name, iucv->src_name, 8); 1963 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1964 nsk->sk_bound_dev_if = sk->sk_bound_dev_if; 1965 niucv->hs_dev = iucv->hs_dev; 1966 dev_hold(niucv->hs_dev); 1967 afiucv_swap_src_dest(skb); 1968 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; 1969 trans_hdr->window = niucv->msglimit; 1970 /* if receiver acks the xmit connection is established */ 1971 err = dev_queue_xmit(skb); 1972 if (!err) { 1973 iucv_accept_enqueue(sk, nsk); 1974 nsk->sk_state = IUCV_CONNECTED; 1975 sk->sk_data_ready(sk, 1); 1976 } else 1977 iucv_sock_kill(nsk); 1978 bh_unlock_sock(sk); 1979 1980 out: 1981 return NET_RX_SUCCESS; 1982 } 1983 1984 /** 1985 * afiucv_hs_callback_synack() - react on received SYN-ACK 1986 **/ 1987 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) 1988 { 1989 struct iucv_sock *iucv = iucv_sk(sk); 1990 struct af_iucv_trans_hdr *trans_hdr = 1991 (struct af_iucv_trans_hdr *)skb->data; 1992 1993 if (!iucv) 1994 goto out; 1995 if (sk->sk_state != IUCV_BOUND) 1996 goto out; 1997 bh_lock_sock(sk); 1998 iucv->msglimit_peer = trans_hdr->window; 1999 sk->sk_state = IUCV_CONNECTED; 2000 sk->sk_state_change(sk); 2001 bh_unlock_sock(sk); 2002 out: 2003 kfree_skb(skb); 2004 return NET_RX_SUCCESS; 2005 } 2006 2007 /** 2008 * afiucv_hs_callback_synfin() - react on received SYN_FIN 2009 **/ 2010 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) 2011 { 2012 struct iucv_sock *iucv = iucv_sk(sk); 2013 2014 if (!iucv) 2015 goto out; 2016 if (sk->sk_state != IUCV_BOUND) 2017 goto out; 2018 bh_lock_sock(sk); 2019 sk->sk_state = IUCV_DISCONN; 2020 sk->sk_state_change(sk); 2021 bh_unlock_sock(sk); 2022 out: 2023 kfree_skb(skb); 2024 return NET_RX_SUCCESS; 2025 } 2026 2027 /** 2028 * afiucv_hs_callback_fin() - react on received FIN 2029 **/ 2030 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) 2031 { 2032 struct iucv_sock *iucv = iucv_sk(sk); 2033 2034 /* other end of connection closed */ 2035 if (!iucv) 2036 goto out; 2037 bh_lock_sock(sk); 2038 if (sk->sk_state == IUCV_CONNECTED) { 2039 sk->sk_state = IUCV_DISCONN; 2040 sk->sk_state_change(sk); 2041 } 2042 bh_unlock_sock(sk); 2043 out: 2044 kfree_skb(skb); 2045 return NET_RX_SUCCESS; 2046 } 2047 2048 /** 2049 * afiucv_hs_callback_win() - react on received WIN 2050 **/ 2051 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) 2052 { 2053 struct iucv_sock *iucv = iucv_sk(sk); 2054 struct af_iucv_trans_hdr *trans_hdr = 2055 (struct af_iucv_trans_hdr *)skb->data; 2056 2057 if (!iucv) 2058 return NET_RX_SUCCESS; 2059 2060 if (sk->sk_state != IUCV_CONNECTED) 2061 return NET_RX_SUCCESS; 2062 2063 atomic_sub(trans_hdr->window, &iucv->msg_sent); 2064 iucv_sock_wake_msglim(sk); 2065 return NET_RX_SUCCESS; 2066 } 2067 2068 /** 2069 * afiucv_hs_callback_rx() - react on received data 2070 **/ 2071 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) 2072 { 2073 struct iucv_sock *iucv = iucv_sk(sk); 2074 2075 if (!iucv) { 2076 kfree_skb(skb); 2077 return NET_RX_SUCCESS; 2078 } 2079 2080 if (sk->sk_state != IUCV_CONNECTED) { 2081 kfree_skb(skb); 2082 return NET_RX_SUCCESS; 2083 } 2084 2085 if (sk->sk_shutdown & RCV_SHUTDOWN) { 2086 kfree_skb(skb); 2087 return NET_RX_SUCCESS; 2088 } 2089 2090 /* write stuff from iucv_msg to skb cb */ 2091 if (skb->len < sizeof(struct af_iucv_trans_hdr)) { 2092 kfree_skb(skb); 2093 return NET_RX_SUCCESS; 2094 } 2095 skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); 2096 skb_reset_transport_header(skb); 2097 skb_reset_network_header(skb); 2098 spin_lock(&iucv->message_q.lock); 2099 if (skb_queue_empty(&iucv->backlog_skb_q)) { 2100 if (sock_queue_rcv_skb(sk, skb)) { 2101 /* handle rcv queue full */ 2102 skb_queue_tail(&iucv->backlog_skb_q, skb); 2103 } 2104 } else 2105 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 2106 spin_unlock(&iucv->message_q.lock); 2107 return NET_RX_SUCCESS; 2108 } 2109 2110 /** 2111 * afiucv_hs_rcv() - base function for arriving data through HiperSockets 2112 * transport 2113 * called from netif RX softirq 2114 **/ 2115 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 2116 struct packet_type *pt, struct net_device *orig_dev) 2117 { 2118 struct hlist_node *node; 2119 struct sock *sk; 2120 struct iucv_sock *iucv; 2121 struct af_iucv_trans_hdr *trans_hdr; 2122 char nullstring[8]; 2123 int err = 0; 2124 2125 skb_pull(skb, ETH_HLEN); 2126 trans_hdr = (struct af_iucv_trans_hdr *)skb->data; 2127 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 2128 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 2129 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 2130 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 2131 memset(nullstring, 0, sizeof(nullstring)); 2132 iucv = NULL; 2133 sk = NULL; 2134 read_lock(&iucv_sk_list.lock); 2135 sk_for_each(sk, node, &iucv_sk_list.head) { 2136 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { 2137 if ((!memcmp(&iucv_sk(sk)->src_name, 2138 trans_hdr->destAppName, 8)) && 2139 (!memcmp(&iucv_sk(sk)->src_user_id, 2140 trans_hdr->destUserID, 8)) && 2141 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && 2142 (!memcmp(&iucv_sk(sk)->dst_user_id, 2143 nullstring, 8))) { 2144 iucv = iucv_sk(sk); 2145 break; 2146 } 2147 } else { 2148 if ((!memcmp(&iucv_sk(sk)->src_name, 2149 trans_hdr->destAppName, 8)) && 2150 (!memcmp(&iucv_sk(sk)->src_user_id, 2151 trans_hdr->destUserID, 8)) && 2152 (!memcmp(&iucv_sk(sk)->dst_name, 2153 trans_hdr->srcAppName, 8)) && 2154 (!memcmp(&iucv_sk(sk)->dst_user_id, 2155 trans_hdr->srcUserID, 8))) { 2156 iucv = iucv_sk(sk); 2157 break; 2158 } 2159 } 2160 } 2161 read_unlock(&iucv_sk_list.lock); 2162 if (!iucv) 2163 sk = NULL; 2164 2165 /* no sock 2166 how should we send with no sock 2167 1) send without sock no send rc checking? 2168 2) introduce default sock to handle this cases 2169 2170 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case 2171 data -> send FIN 2172 SYN|ACK, SYN|FIN, FIN -> no action? */ 2173 2174 switch (trans_hdr->flags) { 2175 case AF_IUCV_FLAG_SYN: 2176 /* connect request */ 2177 err = afiucv_hs_callback_syn(sk, skb); 2178 break; 2179 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): 2180 /* connect request confirmed */ 2181 err = afiucv_hs_callback_synack(sk, skb); 2182 break; 2183 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): 2184 /* connect request refused */ 2185 err = afiucv_hs_callback_synfin(sk, skb); 2186 break; 2187 case (AF_IUCV_FLAG_FIN): 2188 /* close request */ 2189 err = afiucv_hs_callback_fin(sk, skb); 2190 break; 2191 case (AF_IUCV_FLAG_WIN): 2192 err = afiucv_hs_callback_win(sk, skb); 2193 if (skb->len == sizeof(struct af_iucv_trans_hdr)) { 2194 kfree_skb(skb); 2195 break; 2196 } 2197 /* fall through and receive non-zero length data */ 2198 case (AF_IUCV_FLAG_SHT): 2199 /* shutdown request */ 2200 /* fall through and receive zero length data */ 2201 case 0: 2202 /* plain data frame */ 2203 memcpy(CB_TRGCLS(skb), &trans_hdr->iucv_hdr.class, 2204 CB_TRGCLS_LEN); 2205 err = afiucv_hs_callback_rx(sk, skb); 2206 break; 2207 default: 2208 ; 2209 } 2210 2211 return err; 2212 } 2213 2214 /** 2215 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets 2216 * transport 2217 **/ 2218 static void afiucv_hs_callback_txnotify(struct sk_buff *skb, 2219 enum iucv_tx_notify n) 2220 { 2221 struct sock *isk = skb->sk; 2222 struct sock *sk = NULL; 2223 struct iucv_sock *iucv = NULL; 2224 struct sk_buff_head *list; 2225 struct sk_buff *list_skb; 2226 struct sk_buff *nskb; 2227 unsigned long flags; 2228 struct hlist_node *node; 2229 2230 read_lock_irqsave(&iucv_sk_list.lock, flags); 2231 sk_for_each(sk, node, &iucv_sk_list.head) 2232 if (sk == isk) { 2233 iucv = iucv_sk(sk); 2234 break; 2235 } 2236 read_unlock_irqrestore(&iucv_sk_list.lock, flags); 2237 2238 if (!iucv || sock_flag(sk, SOCK_ZAPPED)) 2239 return; 2240 2241 list = &iucv->send_skb_q; 2242 spin_lock_irqsave(&list->lock, flags); 2243 if (skb_queue_empty(list)) 2244 goto out_unlock; 2245 list_skb = list->next; 2246 nskb = list_skb->next; 2247 while (list_skb != (struct sk_buff *)list) { 2248 if (skb_shinfo(list_skb) == skb_shinfo(skb)) { 2249 switch (n) { 2250 case TX_NOTIFY_OK: 2251 __skb_unlink(list_skb, list); 2252 kfree_skb(list_skb); 2253 iucv_sock_wake_msglim(sk); 2254 break; 2255 case TX_NOTIFY_PENDING: 2256 atomic_inc(&iucv->pendings); 2257 break; 2258 case TX_NOTIFY_DELAYED_OK: 2259 __skb_unlink(list_skb, list); 2260 atomic_dec(&iucv->pendings); 2261 if (atomic_read(&iucv->pendings) <= 0) 2262 iucv_sock_wake_msglim(sk); 2263 kfree_skb(list_skb); 2264 break; 2265 case TX_NOTIFY_UNREACHABLE: 2266 case TX_NOTIFY_DELAYED_UNREACHABLE: 2267 case TX_NOTIFY_TPQFULL: /* not yet used */ 2268 case TX_NOTIFY_GENERALERROR: 2269 case TX_NOTIFY_DELAYED_GENERALERROR: 2270 __skb_unlink(list_skb, list); 2271 kfree_skb(list_skb); 2272 if (sk->sk_state == IUCV_CONNECTED) { 2273 sk->sk_state = IUCV_DISCONN; 2274 sk->sk_state_change(sk); 2275 } 2276 break; 2277 } 2278 break; 2279 } 2280 list_skb = nskb; 2281 nskb = nskb->next; 2282 } 2283 out_unlock: 2284 spin_unlock_irqrestore(&list->lock, flags); 2285 2286 if (sk->sk_state == IUCV_CLOSING) { 2287 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 2288 sk->sk_state = IUCV_CLOSED; 2289 sk->sk_state_change(sk); 2290 } 2291 } 2292 2293 } 2294 2295 /* 2296 * afiucv_netdev_event: handle netdev notifier chain events 2297 */ 2298 static int afiucv_netdev_event(struct notifier_block *this, 2299 unsigned long event, void *ptr) 2300 { 2301 struct net_device *event_dev = (struct net_device *)ptr; 2302 struct hlist_node *node; 2303 struct sock *sk; 2304 struct iucv_sock *iucv; 2305 2306 switch (event) { 2307 case NETDEV_REBOOT: 2308 case NETDEV_GOING_DOWN: 2309 sk_for_each(sk, node, &iucv_sk_list.head) { 2310 iucv = iucv_sk(sk); 2311 if ((iucv->hs_dev == event_dev) && 2312 (sk->sk_state == IUCV_CONNECTED)) { 2313 if (event == NETDEV_GOING_DOWN) 2314 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 2315 sk->sk_state = IUCV_DISCONN; 2316 sk->sk_state_change(sk); 2317 } 2318 } 2319 break; 2320 case NETDEV_DOWN: 2321 case NETDEV_UNREGISTER: 2322 default: 2323 break; 2324 } 2325 return NOTIFY_DONE; 2326 } 2327 2328 static struct notifier_block afiucv_netdev_notifier = { 2329 .notifier_call = afiucv_netdev_event, 2330 }; 2331 2332 static const struct proto_ops iucv_sock_ops = { 2333 .family = PF_IUCV, 2334 .owner = THIS_MODULE, 2335 .release = iucv_sock_release, 2336 .bind = iucv_sock_bind, 2337 .connect = iucv_sock_connect, 2338 .listen = iucv_sock_listen, 2339 .accept = iucv_sock_accept, 2340 .getname = iucv_sock_getname, 2341 .sendmsg = iucv_sock_sendmsg, 2342 .recvmsg = iucv_sock_recvmsg, 2343 .poll = iucv_sock_poll, 2344 .ioctl = sock_no_ioctl, 2345 .mmap = sock_no_mmap, 2346 .socketpair = sock_no_socketpair, 2347 .shutdown = iucv_sock_shutdown, 2348 .setsockopt = iucv_sock_setsockopt, 2349 .getsockopt = iucv_sock_getsockopt, 2350 }; 2351 2352 static const struct net_proto_family iucv_sock_family_ops = { 2353 .family = AF_IUCV, 2354 .owner = THIS_MODULE, 2355 .create = iucv_sock_create, 2356 }; 2357 2358 static struct packet_type iucv_packet_type = { 2359 .type = cpu_to_be16(ETH_P_AF_IUCV), 2360 .func = afiucv_hs_rcv, 2361 }; 2362 2363 static int afiucv_iucv_init(void) 2364 { 2365 int err; 2366 2367 err = pr_iucv->iucv_register(&af_iucv_handler, 0); 2368 if (err) 2369 goto out; 2370 /* establish dummy device */ 2371 af_iucv_driver.bus = pr_iucv->bus; 2372 err = driver_register(&af_iucv_driver); 2373 if (err) 2374 goto out_iucv; 2375 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); 2376 if (!af_iucv_dev) { 2377 err = -ENOMEM; 2378 goto out_driver; 2379 } 2380 dev_set_name(af_iucv_dev, "af_iucv"); 2381 af_iucv_dev->bus = pr_iucv->bus; 2382 af_iucv_dev->parent = pr_iucv->root; 2383 af_iucv_dev->release = (void (*)(struct device *))kfree; 2384 af_iucv_dev->driver = &af_iucv_driver; 2385 err = device_register(af_iucv_dev); 2386 if (err) 2387 goto out_driver; 2388 return 0; 2389 2390 out_driver: 2391 driver_unregister(&af_iucv_driver); 2392 out_iucv: 2393 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2394 out: 2395 return err; 2396 } 2397 2398 static int __init afiucv_init(void) 2399 { 2400 int err; 2401 2402 if (MACHINE_IS_VM) { 2403 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); 2404 if (unlikely(err)) { 2405 WARN_ON(err); 2406 err = -EPROTONOSUPPORT; 2407 goto out; 2408 } 2409 2410 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); 2411 if (!pr_iucv) { 2412 printk(KERN_WARNING "iucv_if lookup failed\n"); 2413 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2414 } 2415 } else { 2416 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2417 pr_iucv = NULL; 2418 } 2419 2420 err = proto_register(&iucv_proto, 0); 2421 if (err) 2422 goto out; 2423 err = sock_register(&iucv_sock_family_ops); 2424 if (err) 2425 goto out_proto; 2426 2427 if (pr_iucv) { 2428 err = afiucv_iucv_init(); 2429 if (err) 2430 goto out_sock; 2431 } else 2432 register_netdevice_notifier(&afiucv_netdev_notifier); 2433 dev_add_pack(&iucv_packet_type); 2434 return 0; 2435 2436 out_sock: 2437 sock_unregister(PF_IUCV); 2438 out_proto: 2439 proto_unregister(&iucv_proto); 2440 out: 2441 if (pr_iucv) 2442 symbol_put(iucv_if); 2443 return err; 2444 } 2445 2446 static void __exit afiucv_exit(void) 2447 { 2448 if (pr_iucv) { 2449 device_unregister(af_iucv_dev); 2450 driver_unregister(&af_iucv_driver); 2451 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2452 symbol_put(iucv_if); 2453 } else 2454 unregister_netdevice_notifier(&afiucv_netdev_notifier); 2455 dev_remove_pack(&iucv_packet_type); 2456 sock_unregister(PF_IUCV); 2457 proto_unregister(&iucv_proto); 2458 } 2459 2460 module_init(afiucv_init); 2461 module_exit(afiucv_exit); 2462 2463 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); 2464 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); 2465 MODULE_VERSION(VERSION); 2466 MODULE_LICENSE("GPL"); 2467 MODULE_ALIAS_NETPROTO(PF_IUCV); 2468 2469