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 skb_shinfo(skb)->tx_flags |= SKBTX_DRV_NEEDS_SK_REF; 376 nskb = skb_clone(skb, GFP_ATOMIC); 377 if (!nskb) 378 return -ENOMEM; 379 skb_queue_tail(&iucv->send_skb_q, nskb); 380 err = dev_queue_xmit(skb); 381 if (net_xmit_eval(err)) { 382 skb_unlink(nskb, &iucv->send_skb_q); 383 kfree_skb(nskb); 384 } else { 385 atomic_sub(confirm_recv, &iucv->msg_recv); 386 WARN_ON(atomic_read(&iucv->msg_recv) < 0); 387 } 388 return net_xmit_eval(err); 389 } 390 391 static struct sock *__iucv_get_sock_by_name(char *nm) 392 { 393 struct sock *sk; 394 struct hlist_node *node; 395 396 sk_for_each(sk, node, &iucv_sk_list.head) 397 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) 398 return sk; 399 400 return NULL; 401 } 402 403 static void iucv_sock_destruct(struct sock *sk) 404 { 405 skb_queue_purge(&sk->sk_receive_queue); 406 skb_queue_purge(&sk->sk_error_queue); 407 408 sk_mem_reclaim(sk); 409 410 if (!sock_flag(sk, SOCK_DEAD)) { 411 pr_err("Attempt to release alive iucv socket %p\n", sk); 412 return; 413 } 414 415 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 416 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 417 WARN_ON(sk->sk_wmem_queued); 418 WARN_ON(sk->sk_forward_alloc); 419 } 420 421 /* Cleanup Listen */ 422 static void iucv_sock_cleanup_listen(struct sock *parent) 423 { 424 struct sock *sk; 425 426 /* Close non-accepted connections */ 427 while ((sk = iucv_accept_dequeue(parent, NULL))) { 428 iucv_sock_close(sk); 429 iucv_sock_kill(sk); 430 } 431 432 parent->sk_state = IUCV_CLOSED; 433 } 434 435 /* Kill socket (only if zapped and orphaned) */ 436 static void iucv_sock_kill(struct sock *sk) 437 { 438 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) 439 return; 440 441 iucv_sock_unlink(&iucv_sk_list, sk); 442 sock_set_flag(sk, SOCK_DEAD); 443 sock_put(sk); 444 } 445 446 /* Terminate an IUCV path */ 447 static void iucv_sever_path(struct sock *sk, int with_user_data) 448 { 449 unsigned char user_data[16]; 450 struct iucv_sock *iucv = iucv_sk(sk); 451 struct iucv_path *path = iucv->path; 452 453 if (iucv->path) { 454 iucv->path = NULL; 455 if (with_user_data) { 456 low_nmcpy(user_data, iucv->src_name); 457 high_nmcpy(user_data, iucv->dst_name); 458 ASCEBC(user_data, sizeof(user_data)); 459 pr_iucv->path_sever(path, user_data); 460 } else 461 pr_iucv->path_sever(path, NULL); 462 iucv_path_free(path); 463 } 464 } 465 466 /* Send FIN through an IUCV socket for HIPER transport */ 467 static int iucv_send_ctrl(struct sock *sk, u8 flags) 468 { 469 int err = 0; 470 int blen; 471 struct sk_buff *skb; 472 473 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; 474 skb = sock_alloc_send_skb(sk, blen, 1, &err); 475 if (skb) { 476 skb_reserve(skb, blen); 477 err = afiucv_hs_send(NULL, sk, skb, flags); 478 } 479 return err; 480 } 481 482 /* Close an IUCV socket */ 483 static void iucv_sock_close(struct sock *sk) 484 { 485 struct iucv_sock *iucv = iucv_sk(sk); 486 unsigned long timeo; 487 int err = 0; 488 489 lock_sock(sk); 490 491 switch (sk->sk_state) { 492 case IUCV_LISTEN: 493 iucv_sock_cleanup_listen(sk); 494 break; 495 496 case IUCV_CONNECTED: 497 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 498 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 499 sk->sk_state = IUCV_DISCONN; 500 sk->sk_state_change(sk); 501 } 502 case IUCV_DISCONN: /* fall through */ 503 sk->sk_state = IUCV_CLOSING; 504 sk->sk_state_change(sk); 505 506 if (!err && !skb_queue_empty(&iucv->send_skb_q)) { 507 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) 508 timeo = sk->sk_lingertime; 509 else 510 timeo = IUCV_DISCONN_TIMEOUT; 511 iucv_sock_wait(sk, 512 iucv_sock_in_state(sk, IUCV_CLOSED, 0), 513 timeo); 514 } 515 516 case IUCV_CLOSING: /* fall through */ 517 sk->sk_state = IUCV_CLOSED; 518 sk->sk_state_change(sk); 519 520 sk->sk_err = ECONNRESET; 521 sk->sk_state_change(sk); 522 523 skb_queue_purge(&iucv->send_skb_q); 524 skb_queue_purge(&iucv->backlog_skb_q); 525 526 default: /* fall through */ 527 iucv_sever_path(sk, 1); 528 } 529 530 if (iucv->hs_dev) { 531 dev_put(iucv->hs_dev); 532 iucv->hs_dev = NULL; 533 sk->sk_bound_dev_if = 0; 534 } 535 536 /* mark socket for deletion by iucv_sock_kill() */ 537 sock_set_flag(sk, SOCK_ZAPPED); 538 539 release_sock(sk); 540 } 541 542 static void iucv_sock_init(struct sock *sk, struct sock *parent) 543 { 544 if (parent) 545 sk->sk_type = parent->sk_type; 546 } 547 548 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) 549 { 550 struct sock *sk; 551 struct iucv_sock *iucv; 552 553 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto); 554 if (!sk) 555 return NULL; 556 iucv = iucv_sk(sk); 557 558 sock_init_data(sock, sk); 559 INIT_LIST_HEAD(&iucv->accept_q); 560 spin_lock_init(&iucv->accept_q_lock); 561 skb_queue_head_init(&iucv->send_skb_q); 562 INIT_LIST_HEAD(&iucv->message_q.list); 563 spin_lock_init(&iucv->message_q.lock); 564 skb_queue_head_init(&iucv->backlog_skb_q); 565 iucv->send_tag = 0; 566 atomic_set(&iucv->pendings, 0); 567 iucv->flags = 0; 568 iucv->msglimit = 0; 569 atomic_set(&iucv->msg_sent, 0); 570 atomic_set(&iucv->msg_recv, 0); 571 iucv->path = NULL; 572 iucv->sk_txnotify = afiucv_hs_callback_txnotify; 573 memset(&iucv->src_user_id , 0, 32); 574 if (pr_iucv) 575 iucv->transport = AF_IUCV_TRANS_IUCV; 576 else 577 iucv->transport = AF_IUCV_TRANS_HIPER; 578 579 sk->sk_destruct = iucv_sock_destruct; 580 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; 581 sk->sk_allocation = GFP_DMA; 582 583 sock_reset_flag(sk, SOCK_ZAPPED); 584 585 sk->sk_protocol = proto; 586 sk->sk_state = IUCV_OPEN; 587 588 iucv_sock_link(&iucv_sk_list, sk); 589 return sk; 590 } 591 592 /* Create an IUCV socket */ 593 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, 594 int kern) 595 { 596 struct sock *sk; 597 598 if (protocol && protocol != PF_IUCV) 599 return -EPROTONOSUPPORT; 600 601 sock->state = SS_UNCONNECTED; 602 603 switch (sock->type) { 604 case SOCK_STREAM: 605 sock->ops = &iucv_sock_ops; 606 break; 607 case SOCK_SEQPACKET: 608 /* currently, proto ops can handle both sk types */ 609 sock->ops = &iucv_sock_ops; 610 break; 611 default: 612 return -ESOCKTNOSUPPORT; 613 } 614 615 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL); 616 if (!sk) 617 return -ENOMEM; 618 619 iucv_sock_init(sk, NULL); 620 621 return 0; 622 } 623 624 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) 625 { 626 write_lock_bh(&l->lock); 627 sk_add_node(sk, &l->head); 628 write_unlock_bh(&l->lock); 629 } 630 631 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) 632 { 633 write_lock_bh(&l->lock); 634 sk_del_node_init(sk); 635 write_unlock_bh(&l->lock); 636 } 637 638 void iucv_accept_enqueue(struct sock *parent, struct sock *sk) 639 { 640 unsigned long flags; 641 struct iucv_sock *par = iucv_sk(parent); 642 643 sock_hold(sk); 644 spin_lock_irqsave(&par->accept_q_lock, flags); 645 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); 646 spin_unlock_irqrestore(&par->accept_q_lock, flags); 647 iucv_sk(sk)->parent = parent; 648 sk_acceptq_added(parent); 649 } 650 651 void iucv_accept_unlink(struct sock *sk) 652 { 653 unsigned long flags; 654 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); 655 656 spin_lock_irqsave(&par->accept_q_lock, flags); 657 list_del_init(&iucv_sk(sk)->accept_q); 658 spin_unlock_irqrestore(&par->accept_q_lock, flags); 659 sk_acceptq_removed(iucv_sk(sk)->parent); 660 iucv_sk(sk)->parent = NULL; 661 sock_put(sk); 662 } 663 664 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) 665 { 666 struct iucv_sock *isk, *n; 667 struct sock *sk; 668 669 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 670 sk = (struct sock *) isk; 671 lock_sock(sk); 672 673 if (sk->sk_state == IUCV_CLOSED) { 674 iucv_accept_unlink(sk); 675 release_sock(sk); 676 continue; 677 } 678 679 if (sk->sk_state == IUCV_CONNECTED || 680 sk->sk_state == IUCV_DISCONN || 681 !newsock) { 682 iucv_accept_unlink(sk); 683 if (newsock) 684 sock_graft(sk, newsock); 685 686 release_sock(sk); 687 return sk; 688 } 689 690 release_sock(sk); 691 } 692 return NULL; 693 } 694 695 /* Bind an unbound socket */ 696 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, 697 int addr_len) 698 { 699 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 700 struct sock *sk = sock->sk; 701 struct iucv_sock *iucv; 702 int err = 0; 703 struct net_device *dev; 704 char uid[9]; 705 706 /* Verify the input sockaddr */ 707 if (!addr || addr->sa_family != AF_IUCV) 708 return -EINVAL; 709 710 lock_sock(sk); 711 if (sk->sk_state != IUCV_OPEN) { 712 err = -EBADFD; 713 goto done; 714 } 715 716 write_lock_bh(&iucv_sk_list.lock); 717 718 iucv = iucv_sk(sk); 719 if (__iucv_get_sock_by_name(sa->siucv_name)) { 720 err = -EADDRINUSE; 721 goto done_unlock; 722 } 723 if (iucv->path) 724 goto done_unlock; 725 726 /* Bind the socket */ 727 if (pr_iucv) 728 if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) 729 goto vm_bind; /* VM IUCV transport */ 730 731 /* try hiper transport */ 732 memcpy(uid, sa->siucv_user_id, sizeof(uid)); 733 ASCEBC(uid, 8); 734 rcu_read_lock(); 735 for_each_netdev_rcu(&init_net, dev) { 736 if (!memcmp(dev->perm_addr, uid, 8)) { 737 memcpy(iucv->src_name, sa->siucv_name, 8); 738 memcpy(iucv->src_user_id, sa->siucv_user_id, 8); 739 sk->sk_bound_dev_if = dev->ifindex; 740 iucv->hs_dev = dev; 741 dev_hold(dev); 742 sk->sk_state = IUCV_BOUND; 743 iucv->transport = AF_IUCV_TRANS_HIPER; 744 if (!iucv->msglimit) 745 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; 746 rcu_read_unlock(); 747 goto done_unlock; 748 } 749 } 750 rcu_read_unlock(); 751 vm_bind: 752 if (pr_iucv) { 753 /* use local userid for backward compat */ 754 memcpy(iucv->src_name, sa->siucv_name, 8); 755 memcpy(iucv->src_user_id, iucv_userid, 8); 756 sk->sk_state = IUCV_BOUND; 757 iucv->transport = AF_IUCV_TRANS_IUCV; 758 if (!iucv->msglimit) 759 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 760 goto done_unlock; 761 } 762 /* found no dev to bind */ 763 err = -ENODEV; 764 done_unlock: 765 /* Release the socket list lock */ 766 write_unlock_bh(&iucv_sk_list.lock); 767 done: 768 release_sock(sk); 769 return err; 770 } 771 772 /* Automatically bind an unbound socket */ 773 static int iucv_sock_autobind(struct sock *sk) 774 { 775 struct iucv_sock *iucv = iucv_sk(sk); 776 char name[12]; 777 int err = 0; 778 779 if (unlikely(!pr_iucv)) 780 return -EPROTO; 781 782 memcpy(iucv->src_user_id, iucv_userid, 8); 783 784 write_lock_bh(&iucv_sk_list.lock); 785 786 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); 787 while (__iucv_get_sock_by_name(name)) { 788 sprintf(name, "%08x", 789 atomic_inc_return(&iucv_sk_list.autobind_name)); 790 } 791 792 write_unlock_bh(&iucv_sk_list.lock); 793 794 memcpy(&iucv->src_name, name, 8); 795 796 if (!iucv->msglimit) 797 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 798 799 return err; 800 } 801 802 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) 803 { 804 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 805 struct sock *sk = sock->sk; 806 struct iucv_sock *iucv = iucv_sk(sk); 807 unsigned char user_data[16]; 808 int err; 809 810 high_nmcpy(user_data, sa->siucv_name); 811 low_nmcpy(user_data, iucv->src_name); 812 ASCEBC(user_data, sizeof(user_data)); 813 814 /* Create path. */ 815 iucv->path = iucv_path_alloc(iucv->msglimit, 816 IUCV_IPRMDATA, GFP_KERNEL); 817 if (!iucv->path) { 818 err = -ENOMEM; 819 goto done; 820 } 821 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, 822 sa->siucv_user_id, NULL, user_data, 823 sk); 824 if (err) { 825 iucv_path_free(iucv->path); 826 iucv->path = NULL; 827 switch (err) { 828 case 0x0b: /* Target communicator is not logged on */ 829 err = -ENETUNREACH; 830 break; 831 case 0x0d: /* Max connections for this guest exceeded */ 832 case 0x0e: /* Max connections for target guest exceeded */ 833 err = -EAGAIN; 834 break; 835 case 0x0f: /* Missing IUCV authorization */ 836 err = -EACCES; 837 break; 838 default: 839 err = -ECONNREFUSED; 840 break; 841 } 842 } 843 done: 844 return err; 845 } 846 847 /* Connect an unconnected socket */ 848 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, 849 int alen, int flags) 850 { 851 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 852 struct sock *sk = sock->sk; 853 struct iucv_sock *iucv = iucv_sk(sk); 854 int err; 855 856 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) 857 return -EINVAL; 858 859 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) 860 return -EBADFD; 861 862 if (sk->sk_state == IUCV_OPEN && 863 iucv->transport == AF_IUCV_TRANS_HIPER) 864 return -EBADFD; /* explicit bind required */ 865 866 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) 867 return -EINVAL; 868 869 if (sk->sk_state == IUCV_OPEN) { 870 err = iucv_sock_autobind(sk); 871 if (unlikely(err)) 872 return err; 873 } 874 875 lock_sock(sk); 876 877 /* Set the destination information */ 878 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); 879 memcpy(iucv->dst_name, sa->siucv_name, 8); 880 881 if (iucv->transport == AF_IUCV_TRANS_HIPER) 882 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); 883 else 884 err = afiucv_path_connect(sock, addr); 885 if (err) 886 goto done; 887 888 if (sk->sk_state != IUCV_CONNECTED) 889 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, 890 IUCV_DISCONN), 891 sock_sndtimeo(sk, flags & O_NONBLOCK)); 892 893 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) 894 err = -ECONNREFUSED; 895 896 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) 897 iucv_sever_path(sk, 0); 898 899 done: 900 release_sock(sk); 901 return err; 902 } 903 904 /* Move a socket into listening state. */ 905 static int iucv_sock_listen(struct socket *sock, int backlog) 906 { 907 struct sock *sk = sock->sk; 908 int err; 909 910 lock_sock(sk); 911 912 err = -EINVAL; 913 if (sk->sk_state != IUCV_BOUND) 914 goto done; 915 916 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) 917 goto done; 918 919 sk->sk_max_ack_backlog = backlog; 920 sk->sk_ack_backlog = 0; 921 sk->sk_state = IUCV_LISTEN; 922 err = 0; 923 924 done: 925 release_sock(sk); 926 return err; 927 } 928 929 /* Accept a pending connection */ 930 static int iucv_sock_accept(struct socket *sock, struct socket *newsock, 931 int flags) 932 { 933 DECLARE_WAITQUEUE(wait, current); 934 struct sock *sk = sock->sk, *nsk; 935 long timeo; 936 int err = 0; 937 938 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 939 940 if (sk->sk_state != IUCV_LISTEN) { 941 err = -EBADFD; 942 goto done; 943 } 944 945 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 946 947 /* Wait for an incoming connection */ 948 add_wait_queue_exclusive(sk_sleep(sk), &wait); 949 while (!(nsk = iucv_accept_dequeue(sk, newsock))) { 950 set_current_state(TASK_INTERRUPTIBLE); 951 if (!timeo) { 952 err = -EAGAIN; 953 break; 954 } 955 956 release_sock(sk); 957 timeo = schedule_timeout(timeo); 958 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 959 960 if (sk->sk_state != IUCV_LISTEN) { 961 err = -EBADFD; 962 break; 963 } 964 965 if (signal_pending(current)) { 966 err = sock_intr_errno(timeo); 967 break; 968 } 969 } 970 971 set_current_state(TASK_RUNNING); 972 remove_wait_queue(sk_sleep(sk), &wait); 973 974 if (err) 975 goto done; 976 977 newsock->state = SS_CONNECTED; 978 979 done: 980 release_sock(sk); 981 return err; 982 } 983 984 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, 985 int *len, int peer) 986 { 987 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; 988 struct sock *sk = sock->sk; 989 struct iucv_sock *iucv = iucv_sk(sk); 990 991 addr->sa_family = AF_IUCV; 992 *len = sizeof(struct sockaddr_iucv); 993 994 if (peer) { 995 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); 996 memcpy(siucv->siucv_name, iucv->dst_name, 8); 997 } else { 998 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); 999 memcpy(siucv->siucv_name, iucv->src_name, 8); 1000 } 1001 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); 1002 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); 1003 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); 1004 1005 return 0; 1006 } 1007 1008 /** 1009 * iucv_send_iprm() - Send socket data in parameter list of an iucv message. 1010 * @path: IUCV path 1011 * @msg: Pointer to a struct iucv_message 1012 * @skb: The socket data to send, skb->len MUST BE <= 7 1013 * 1014 * Send the socket data in the parameter list in the iucv message 1015 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter 1016 * list and the socket data len at index 7 (last byte). 1017 * See also iucv_msg_length(). 1018 * 1019 * Returns the error code from the iucv_message_send() call. 1020 */ 1021 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, 1022 struct sk_buff *skb) 1023 { 1024 u8 prmdata[8]; 1025 1026 memcpy(prmdata, (void *) skb->data, skb->len); 1027 prmdata[7] = 0xff - (u8) skb->len; 1028 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, 1029 (void *) prmdata, 8); 1030 } 1031 1032 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, 1033 struct msghdr *msg, size_t len) 1034 { 1035 struct sock *sk = sock->sk; 1036 struct iucv_sock *iucv = iucv_sk(sk); 1037 struct sk_buff *skb; 1038 struct iucv_message txmsg; 1039 struct cmsghdr *cmsg; 1040 int cmsg_done; 1041 long timeo; 1042 char user_id[9]; 1043 char appl_id[9]; 1044 int err; 1045 int noblock = msg->msg_flags & MSG_DONTWAIT; 1046 1047 err = sock_error(sk); 1048 if (err) 1049 return err; 1050 1051 if (msg->msg_flags & MSG_OOB) 1052 return -EOPNOTSUPP; 1053 1054 /* SOCK_SEQPACKET: we do not support segmented records */ 1055 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) 1056 return -EOPNOTSUPP; 1057 1058 lock_sock(sk); 1059 1060 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1061 err = -EPIPE; 1062 goto out; 1063 } 1064 1065 /* Return if the socket is not in connected state */ 1066 if (sk->sk_state != IUCV_CONNECTED) { 1067 err = -ENOTCONN; 1068 goto out; 1069 } 1070 1071 /* initialize defaults */ 1072 cmsg_done = 0; /* check for duplicate headers */ 1073 txmsg.class = 0; 1074 1075 /* iterate over control messages */ 1076 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; 1077 cmsg = CMSG_NXTHDR(msg, cmsg)) { 1078 1079 if (!CMSG_OK(msg, cmsg)) { 1080 err = -EINVAL; 1081 goto out; 1082 } 1083 1084 if (cmsg->cmsg_level != SOL_IUCV) 1085 continue; 1086 1087 if (cmsg->cmsg_type & cmsg_done) { 1088 err = -EINVAL; 1089 goto out; 1090 } 1091 cmsg_done |= cmsg->cmsg_type; 1092 1093 switch (cmsg->cmsg_type) { 1094 case SCM_IUCV_TRGCLS: 1095 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { 1096 err = -EINVAL; 1097 goto out; 1098 } 1099 1100 /* set iucv message target class */ 1101 memcpy(&txmsg.class, 1102 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); 1103 1104 break; 1105 1106 default: 1107 err = -EINVAL; 1108 goto out; 1109 break; 1110 } 1111 } 1112 1113 /* allocate one skb for each iucv message: 1114 * this is fine for SOCK_SEQPACKET (unless we want to support 1115 * segmented records using the MSG_EOR flag), but 1116 * for SOCK_STREAM we might want to improve it in future */ 1117 if (iucv->transport == AF_IUCV_TRANS_HIPER) 1118 skb = sock_alloc_send_skb(sk, 1119 len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN, 1120 noblock, &err); 1121 else 1122 skb = sock_alloc_send_skb(sk, len, noblock, &err); 1123 if (!skb) { 1124 err = -ENOMEM; 1125 goto out; 1126 } 1127 if (iucv->transport == AF_IUCV_TRANS_HIPER) 1128 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN); 1129 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { 1130 err = -EFAULT; 1131 goto fail; 1132 } 1133 1134 /* wait if outstanding messages for iucv path has reached */ 1135 timeo = sock_sndtimeo(sk, noblock); 1136 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); 1137 if (err) 1138 goto fail; 1139 1140 /* return -ECONNRESET if the socket is no longer connected */ 1141 if (sk->sk_state != IUCV_CONNECTED) { 1142 err = -ECONNRESET; 1143 goto fail; 1144 } 1145 1146 /* increment and save iucv message tag for msg_completion cbk */ 1147 txmsg.tag = iucv->send_tag++; 1148 memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN); 1149 1150 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1151 atomic_inc(&iucv->msg_sent); 1152 err = afiucv_hs_send(&txmsg, sk, skb, 0); 1153 if (err) { 1154 atomic_dec(&iucv->msg_sent); 1155 goto fail; 1156 } 1157 goto release; 1158 } 1159 skb_queue_tail(&iucv->send_skb_q, skb); 1160 1161 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) 1162 && skb->len <= 7) { 1163 err = iucv_send_iprm(iucv->path, &txmsg, skb); 1164 1165 /* on success: there is no message_complete callback 1166 * for an IPRMDATA msg; remove skb from send queue */ 1167 if (err == 0) { 1168 skb_unlink(skb, &iucv->send_skb_q); 1169 kfree_skb(skb); 1170 } 1171 1172 /* this error should never happen since the 1173 * IUCV_IPRMDATA path flag is set... sever path */ 1174 if (err == 0x15) { 1175 pr_iucv->path_sever(iucv->path, NULL); 1176 skb_unlink(skb, &iucv->send_skb_q); 1177 err = -EPIPE; 1178 goto fail; 1179 } 1180 } else 1181 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0, 1182 (void *) skb->data, skb->len); 1183 if (err) { 1184 if (err == 3) { 1185 user_id[8] = 0; 1186 memcpy(user_id, iucv->dst_user_id, 8); 1187 appl_id[8] = 0; 1188 memcpy(appl_id, iucv->dst_name, 8); 1189 pr_err("Application %s on z/VM guest %s" 1190 " exceeds message limit\n", 1191 appl_id, user_id); 1192 err = -EAGAIN; 1193 } else 1194 err = -EPIPE; 1195 skb_unlink(skb, &iucv->send_skb_q); 1196 goto fail; 1197 } 1198 1199 release: 1200 release_sock(sk); 1201 return len; 1202 1203 fail: 1204 kfree_skb(skb); 1205 out: 1206 release_sock(sk); 1207 return err; 1208 } 1209 1210 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's 1211 * 1212 * Locking: must be called with message_q.lock held 1213 */ 1214 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) 1215 { 1216 int dataleft, size, copied = 0; 1217 struct sk_buff *nskb; 1218 1219 dataleft = len; 1220 while (dataleft) { 1221 if (dataleft >= sk->sk_rcvbuf / 4) 1222 size = sk->sk_rcvbuf / 4; 1223 else 1224 size = dataleft; 1225 1226 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); 1227 if (!nskb) 1228 return -ENOMEM; 1229 1230 /* copy target class to control buffer of new skb */ 1231 memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN); 1232 1233 /* copy data fragment */ 1234 memcpy(nskb->data, skb->data + copied, size); 1235 copied += size; 1236 dataleft -= size; 1237 1238 skb_reset_transport_header(nskb); 1239 skb_reset_network_header(nskb); 1240 nskb->len = size; 1241 1242 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); 1243 } 1244 1245 return 0; 1246 } 1247 1248 /* iucv_process_message() - Receive a single outstanding IUCV message 1249 * 1250 * Locking: must be called with message_q.lock held 1251 */ 1252 static void iucv_process_message(struct sock *sk, struct sk_buff *skb, 1253 struct iucv_path *path, 1254 struct iucv_message *msg) 1255 { 1256 int rc; 1257 unsigned int len; 1258 1259 len = iucv_msg_length(msg); 1260 1261 /* store msg target class in the second 4 bytes of skb ctrl buffer */ 1262 /* Note: the first 4 bytes are reserved for msg tag */ 1263 memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN); 1264 1265 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ 1266 if ((msg->flags & IUCV_IPRMDATA) && len > 7) { 1267 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { 1268 skb->data = NULL; 1269 skb->len = 0; 1270 } 1271 } else { 1272 rc = pr_iucv->message_receive(path, msg, 1273 msg->flags & IUCV_IPRMDATA, 1274 skb->data, len, NULL); 1275 if (rc) { 1276 kfree_skb(skb); 1277 return; 1278 } 1279 /* we need to fragment iucv messages for SOCK_STREAM only; 1280 * for SOCK_SEQPACKET, it is only relevant if we support 1281 * record segmentation using MSG_EOR (see also recvmsg()) */ 1282 if (sk->sk_type == SOCK_STREAM && 1283 skb->truesize >= sk->sk_rcvbuf / 4) { 1284 rc = iucv_fragment_skb(sk, skb, len); 1285 kfree_skb(skb); 1286 skb = NULL; 1287 if (rc) { 1288 pr_iucv->path_sever(path, NULL); 1289 return; 1290 } 1291 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); 1292 } else { 1293 skb_reset_transport_header(skb); 1294 skb_reset_network_header(skb); 1295 skb->len = len; 1296 } 1297 } 1298 1299 if (sock_queue_rcv_skb(sk, skb)) 1300 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); 1301 } 1302 1303 /* iucv_process_message_q() - Process outstanding IUCV messages 1304 * 1305 * Locking: must be called with message_q.lock held 1306 */ 1307 static void iucv_process_message_q(struct sock *sk) 1308 { 1309 struct iucv_sock *iucv = iucv_sk(sk); 1310 struct sk_buff *skb; 1311 struct sock_msg_q *p, *n; 1312 1313 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 1314 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); 1315 if (!skb) 1316 break; 1317 iucv_process_message(sk, skb, p->path, &p->msg); 1318 list_del(&p->list); 1319 kfree(p); 1320 if (!skb_queue_empty(&iucv->backlog_skb_q)) 1321 break; 1322 } 1323 } 1324 1325 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, 1326 struct msghdr *msg, size_t len, int flags) 1327 { 1328 int noblock = flags & MSG_DONTWAIT; 1329 struct sock *sk = sock->sk; 1330 struct iucv_sock *iucv = iucv_sk(sk); 1331 unsigned int copied, rlen; 1332 struct sk_buff *skb, *rskb, *cskb; 1333 int err = 0; 1334 1335 if ((sk->sk_state == IUCV_DISCONN) && 1336 skb_queue_empty(&iucv->backlog_skb_q) && 1337 skb_queue_empty(&sk->sk_receive_queue) && 1338 list_empty(&iucv->message_q.list)) 1339 return 0; 1340 1341 if (flags & (MSG_OOB)) 1342 return -EOPNOTSUPP; 1343 1344 /* receive/dequeue next skb: 1345 * the function understands MSG_PEEK and, thus, does not dequeue skb */ 1346 skb = skb_recv_datagram(sk, flags, noblock, &err); 1347 if (!skb) { 1348 if (sk->sk_shutdown & RCV_SHUTDOWN) 1349 return 0; 1350 return err; 1351 } 1352 1353 rlen = skb->len; /* real length of skb */ 1354 copied = min_t(unsigned int, rlen, len); 1355 if (!rlen) 1356 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; 1357 1358 cskb = skb; 1359 if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) { 1360 if (!(flags & MSG_PEEK)) 1361 skb_queue_head(&sk->sk_receive_queue, skb); 1362 return -EFAULT; 1363 } 1364 1365 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ 1366 if (sk->sk_type == SOCK_SEQPACKET) { 1367 if (copied < rlen) 1368 msg->msg_flags |= MSG_TRUNC; 1369 /* each iucv message contains a complete record */ 1370 msg->msg_flags |= MSG_EOR; 1371 } 1372 1373 /* create control message to store iucv msg target class: 1374 * get the trgcls from the control buffer of the skb due to 1375 * fragmentation of original iucv message. */ 1376 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, 1377 CB_TRGCLS_LEN, CB_TRGCLS(skb)); 1378 if (err) { 1379 if (!(flags & MSG_PEEK)) 1380 skb_queue_head(&sk->sk_receive_queue, skb); 1381 return err; 1382 } 1383 1384 /* Mark read part of skb as used */ 1385 if (!(flags & MSG_PEEK)) { 1386 1387 /* SOCK_STREAM: re-queue skb if it contains unreceived data */ 1388 if (sk->sk_type == SOCK_STREAM) { 1389 skb_pull(skb, copied); 1390 if (skb->len) { 1391 skb_queue_head(&sk->sk_receive_queue, skb); 1392 goto done; 1393 } 1394 } 1395 1396 kfree_skb(skb); 1397 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1398 atomic_inc(&iucv->msg_recv); 1399 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { 1400 WARN_ON(1); 1401 iucv_sock_close(sk); 1402 return -EFAULT; 1403 } 1404 } 1405 1406 /* Queue backlog skbs */ 1407 spin_lock_bh(&iucv->message_q.lock); 1408 rskb = skb_dequeue(&iucv->backlog_skb_q); 1409 while (rskb) { 1410 if (sock_queue_rcv_skb(sk, rskb)) { 1411 skb_queue_head(&iucv->backlog_skb_q, 1412 rskb); 1413 break; 1414 } else { 1415 rskb = skb_dequeue(&iucv->backlog_skb_q); 1416 } 1417 } 1418 if (skb_queue_empty(&iucv->backlog_skb_q)) { 1419 if (!list_empty(&iucv->message_q.list)) 1420 iucv_process_message_q(sk); 1421 if (atomic_read(&iucv->msg_recv) >= 1422 iucv->msglimit / 2) { 1423 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); 1424 if (err) { 1425 sk->sk_state = IUCV_DISCONN; 1426 sk->sk_state_change(sk); 1427 } 1428 } 1429 } 1430 spin_unlock_bh(&iucv->message_q.lock); 1431 } 1432 1433 done: 1434 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ 1435 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) 1436 copied = rlen; 1437 1438 return copied; 1439 } 1440 1441 static inline unsigned int iucv_accept_poll(struct sock *parent) 1442 { 1443 struct iucv_sock *isk, *n; 1444 struct sock *sk; 1445 1446 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 1447 sk = (struct sock *) isk; 1448 1449 if (sk->sk_state == IUCV_CONNECTED) 1450 return POLLIN | POLLRDNORM; 1451 } 1452 1453 return 0; 1454 } 1455 1456 unsigned int iucv_sock_poll(struct file *file, struct socket *sock, 1457 poll_table *wait) 1458 { 1459 struct sock *sk = sock->sk; 1460 unsigned int mask = 0; 1461 1462 sock_poll_wait(file, sk_sleep(sk), wait); 1463 1464 if (sk->sk_state == IUCV_LISTEN) 1465 return iucv_accept_poll(sk); 1466 1467 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) 1468 mask |= POLLERR; 1469 1470 if (sk->sk_shutdown & RCV_SHUTDOWN) 1471 mask |= POLLRDHUP; 1472 1473 if (sk->sk_shutdown == SHUTDOWN_MASK) 1474 mask |= POLLHUP; 1475 1476 if (!skb_queue_empty(&sk->sk_receive_queue) || 1477 (sk->sk_shutdown & RCV_SHUTDOWN)) 1478 mask |= POLLIN | POLLRDNORM; 1479 1480 if (sk->sk_state == IUCV_CLOSED) 1481 mask |= POLLHUP; 1482 1483 if (sk->sk_state == IUCV_DISCONN) 1484 mask |= POLLIN; 1485 1486 if (sock_writeable(sk) && iucv_below_msglim(sk)) 1487 mask |= POLLOUT | POLLWRNORM | POLLWRBAND; 1488 else 1489 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1490 1491 return mask; 1492 } 1493 1494 static int iucv_sock_shutdown(struct socket *sock, int how) 1495 { 1496 struct sock *sk = sock->sk; 1497 struct iucv_sock *iucv = iucv_sk(sk); 1498 struct iucv_message txmsg; 1499 int err = 0; 1500 1501 how++; 1502 1503 if ((how & ~SHUTDOWN_MASK) || !how) 1504 return -EINVAL; 1505 1506 lock_sock(sk); 1507 switch (sk->sk_state) { 1508 case IUCV_LISTEN: 1509 case IUCV_DISCONN: 1510 case IUCV_CLOSING: 1511 case IUCV_CLOSED: 1512 err = -ENOTCONN; 1513 goto fail; 1514 default: 1515 break; 1516 } 1517 1518 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { 1519 if (iucv->transport == AF_IUCV_TRANS_IUCV) { 1520 txmsg.class = 0; 1521 txmsg.tag = 0; 1522 err = pr_iucv->message_send(iucv->path, &txmsg, 1523 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); 1524 if (err) { 1525 switch (err) { 1526 case 1: 1527 err = -ENOTCONN; 1528 break; 1529 case 2: 1530 err = -ECONNRESET; 1531 break; 1532 default: 1533 err = -ENOTCONN; 1534 break; 1535 } 1536 } 1537 } else 1538 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); 1539 } 1540 1541 sk->sk_shutdown |= how; 1542 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { 1543 if (iucv->transport == AF_IUCV_TRANS_IUCV) { 1544 err = pr_iucv->path_quiesce(iucv->path, NULL); 1545 if (err) 1546 err = -ENOTCONN; 1547 /* skb_queue_purge(&sk->sk_receive_queue); */ 1548 } 1549 skb_queue_purge(&sk->sk_receive_queue); 1550 } 1551 1552 /* Wake up anyone sleeping in poll */ 1553 sk->sk_state_change(sk); 1554 1555 fail: 1556 release_sock(sk); 1557 return err; 1558 } 1559 1560 static int iucv_sock_release(struct socket *sock) 1561 { 1562 struct sock *sk = sock->sk; 1563 int err = 0; 1564 1565 if (!sk) 1566 return 0; 1567 1568 iucv_sock_close(sk); 1569 1570 sock_orphan(sk); 1571 iucv_sock_kill(sk); 1572 return err; 1573 } 1574 1575 /* getsockopt and setsockopt */ 1576 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, 1577 char __user *optval, unsigned int optlen) 1578 { 1579 struct sock *sk = sock->sk; 1580 struct iucv_sock *iucv = iucv_sk(sk); 1581 int val; 1582 int rc; 1583 1584 if (level != SOL_IUCV) 1585 return -ENOPROTOOPT; 1586 1587 if (optlen < sizeof(int)) 1588 return -EINVAL; 1589 1590 if (get_user(val, (int __user *) optval)) 1591 return -EFAULT; 1592 1593 rc = 0; 1594 1595 lock_sock(sk); 1596 switch (optname) { 1597 case SO_IPRMDATA_MSG: 1598 if (val) 1599 iucv->flags |= IUCV_IPRMDATA; 1600 else 1601 iucv->flags &= ~IUCV_IPRMDATA; 1602 break; 1603 case SO_MSGLIMIT: 1604 switch (sk->sk_state) { 1605 case IUCV_OPEN: 1606 case IUCV_BOUND: 1607 if (val < 1 || val > (u16)(~0)) 1608 rc = -EINVAL; 1609 else 1610 iucv->msglimit = val; 1611 break; 1612 default: 1613 rc = -EINVAL; 1614 break; 1615 } 1616 break; 1617 default: 1618 rc = -ENOPROTOOPT; 1619 break; 1620 } 1621 release_sock(sk); 1622 1623 return rc; 1624 } 1625 1626 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, 1627 char __user *optval, int __user *optlen) 1628 { 1629 struct sock *sk = sock->sk; 1630 struct iucv_sock *iucv = iucv_sk(sk); 1631 unsigned int val; 1632 int len; 1633 1634 if (level != SOL_IUCV) 1635 return -ENOPROTOOPT; 1636 1637 if (get_user(len, optlen)) 1638 return -EFAULT; 1639 1640 if (len < 0) 1641 return -EINVAL; 1642 1643 len = min_t(unsigned int, len, sizeof(int)); 1644 1645 switch (optname) { 1646 case SO_IPRMDATA_MSG: 1647 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; 1648 break; 1649 case SO_MSGLIMIT: 1650 lock_sock(sk); 1651 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ 1652 : iucv->msglimit; /* default */ 1653 release_sock(sk); 1654 break; 1655 case SO_MSGSIZE: 1656 if (sk->sk_state == IUCV_OPEN) 1657 return -EBADFD; 1658 val = (iucv->hs_dev) ? iucv->hs_dev->mtu - 1659 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : 1660 0x7fffffff; 1661 break; 1662 default: 1663 return -ENOPROTOOPT; 1664 } 1665 1666 if (put_user(len, optlen)) 1667 return -EFAULT; 1668 if (copy_to_user(optval, &val, len)) 1669 return -EFAULT; 1670 1671 return 0; 1672 } 1673 1674 1675 /* Callback wrappers - called from iucv base support */ 1676 static int iucv_callback_connreq(struct iucv_path *path, 1677 u8 ipvmid[8], u8 ipuser[16]) 1678 { 1679 unsigned char user_data[16]; 1680 unsigned char nuser_data[16]; 1681 unsigned char src_name[8]; 1682 struct hlist_node *node; 1683 struct sock *sk, *nsk; 1684 struct iucv_sock *iucv, *niucv; 1685 int err; 1686 1687 memcpy(src_name, ipuser, 8); 1688 EBCASC(src_name, 8); 1689 /* Find out if this path belongs to af_iucv. */ 1690 read_lock(&iucv_sk_list.lock); 1691 iucv = NULL; 1692 sk = NULL; 1693 sk_for_each(sk, node, &iucv_sk_list.head) 1694 if (sk->sk_state == IUCV_LISTEN && 1695 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { 1696 /* 1697 * Found a listening socket with 1698 * src_name == ipuser[0-7]. 1699 */ 1700 iucv = iucv_sk(sk); 1701 break; 1702 } 1703 read_unlock(&iucv_sk_list.lock); 1704 if (!iucv) 1705 /* No socket found, not one of our paths. */ 1706 return -EINVAL; 1707 1708 bh_lock_sock(sk); 1709 1710 /* Check if parent socket is listening */ 1711 low_nmcpy(user_data, iucv->src_name); 1712 high_nmcpy(user_data, iucv->dst_name); 1713 ASCEBC(user_data, sizeof(user_data)); 1714 if (sk->sk_state != IUCV_LISTEN) { 1715 err = pr_iucv->path_sever(path, user_data); 1716 iucv_path_free(path); 1717 goto fail; 1718 } 1719 1720 /* Check for backlog size */ 1721 if (sk_acceptq_is_full(sk)) { 1722 err = pr_iucv->path_sever(path, user_data); 1723 iucv_path_free(path); 1724 goto fail; 1725 } 1726 1727 /* Create the new socket */ 1728 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); 1729 if (!nsk) { 1730 err = pr_iucv->path_sever(path, user_data); 1731 iucv_path_free(path); 1732 goto fail; 1733 } 1734 1735 niucv = iucv_sk(nsk); 1736 iucv_sock_init(nsk, sk); 1737 1738 /* Set the new iucv_sock */ 1739 memcpy(niucv->dst_name, ipuser + 8, 8); 1740 EBCASC(niucv->dst_name, 8); 1741 memcpy(niucv->dst_user_id, ipvmid, 8); 1742 memcpy(niucv->src_name, iucv->src_name, 8); 1743 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1744 niucv->path = path; 1745 1746 /* Call iucv_accept */ 1747 high_nmcpy(nuser_data, ipuser + 8); 1748 memcpy(nuser_data + 8, niucv->src_name, 8); 1749 ASCEBC(nuser_data + 8, 8); 1750 1751 /* set message limit for path based on msglimit of accepting socket */ 1752 niucv->msglimit = iucv->msglimit; 1753 path->msglim = iucv->msglimit; 1754 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); 1755 if (err) { 1756 iucv_sever_path(nsk, 1); 1757 iucv_sock_kill(nsk); 1758 goto fail; 1759 } 1760 1761 iucv_accept_enqueue(sk, nsk); 1762 1763 /* Wake up accept */ 1764 nsk->sk_state = IUCV_CONNECTED; 1765 sk->sk_data_ready(sk, 1); 1766 err = 0; 1767 fail: 1768 bh_unlock_sock(sk); 1769 return 0; 1770 } 1771 1772 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) 1773 { 1774 struct sock *sk = path->private; 1775 1776 sk->sk_state = IUCV_CONNECTED; 1777 sk->sk_state_change(sk); 1778 } 1779 1780 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) 1781 { 1782 struct sock *sk = path->private; 1783 struct iucv_sock *iucv = iucv_sk(sk); 1784 struct sk_buff *skb; 1785 struct sock_msg_q *save_msg; 1786 int len; 1787 1788 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1789 pr_iucv->message_reject(path, msg); 1790 return; 1791 } 1792 1793 spin_lock(&iucv->message_q.lock); 1794 1795 if (!list_empty(&iucv->message_q.list) || 1796 !skb_queue_empty(&iucv->backlog_skb_q)) 1797 goto save_message; 1798 1799 len = atomic_read(&sk->sk_rmem_alloc); 1800 len += SKB_TRUESIZE(iucv_msg_length(msg)); 1801 if (len > sk->sk_rcvbuf) 1802 goto save_message; 1803 1804 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); 1805 if (!skb) 1806 goto save_message; 1807 1808 iucv_process_message(sk, skb, path, msg); 1809 goto out_unlock; 1810 1811 save_message: 1812 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); 1813 if (!save_msg) 1814 goto out_unlock; 1815 save_msg->path = path; 1816 save_msg->msg = *msg; 1817 1818 list_add_tail(&save_msg->list, &iucv->message_q.list); 1819 1820 out_unlock: 1821 spin_unlock(&iucv->message_q.lock); 1822 } 1823 1824 static void iucv_callback_txdone(struct iucv_path *path, 1825 struct iucv_message *msg) 1826 { 1827 struct sock *sk = path->private; 1828 struct sk_buff *this = NULL; 1829 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; 1830 struct sk_buff *list_skb = list->next; 1831 unsigned long flags; 1832 1833 bh_lock_sock(sk); 1834 if (!skb_queue_empty(list)) { 1835 spin_lock_irqsave(&list->lock, flags); 1836 1837 while (list_skb != (struct sk_buff *)list) { 1838 if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) { 1839 this = list_skb; 1840 break; 1841 } 1842 list_skb = list_skb->next; 1843 } 1844 if (this) 1845 __skb_unlink(this, list); 1846 1847 spin_unlock_irqrestore(&list->lock, flags); 1848 1849 if (this) { 1850 kfree_skb(this); 1851 /* wake up any process waiting for sending */ 1852 iucv_sock_wake_msglim(sk); 1853 } 1854 } 1855 1856 if (sk->sk_state == IUCV_CLOSING) { 1857 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 1858 sk->sk_state = IUCV_CLOSED; 1859 sk->sk_state_change(sk); 1860 } 1861 } 1862 bh_unlock_sock(sk); 1863 1864 } 1865 1866 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) 1867 { 1868 struct sock *sk = path->private; 1869 1870 if (sk->sk_state == IUCV_CLOSED) 1871 return; 1872 1873 bh_lock_sock(sk); 1874 iucv_sever_path(sk, 1); 1875 sk->sk_state = IUCV_DISCONN; 1876 1877 sk->sk_state_change(sk); 1878 bh_unlock_sock(sk); 1879 } 1880 1881 /* called if the other communication side shuts down its RECV direction; 1882 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. 1883 */ 1884 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) 1885 { 1886 struct sock *sk = path->private; 1887 1888 bh_lock_sock(sk); 1889 if (sk->sk_state != IUCV_CLOSED) { 1890 sk->sk_shutdown |= SEND_SHUTDOWN; 1891 sk->sk_state_change(sk); 1892 } 1893 bh_unlock_sock(sk); 1894 } 1895 1896 /***************** HiperSockets transport callbacks ********************/ 1897 static void afiucv_swap_src_dest(struct sk_buff *skb) 1898 { 1899 struct af_iucv_trans_hdr *trans_hdr = 1900 (struct af_iucv_trans_hdr *)skb->data; 1901 char tmpID[8]; 1902 char tmpName[8]; 1903 1904 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 1905 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 1906 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 1907 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 1908 memcpy(tmpID, trans_hdr->srcUserID, 8); 1909 memcpy(tmpName, trans_hdr->srcAppName, 8); 1910 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); 1911 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); 1912 memcpy(trans_hdr->destUserID, tmpID, 8); 1913 memcpy(trans_hdr->destAppName, tmpName, 8); 1914 skb_push(skb, ETH_HLEN); 1915 memset(skb->data, 0, ETH_HLEN); 1916 } 1917 1918 /** 1919 * afiucv_hs_callback_syn - react on received SYN 1920 **/ 1921 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) 1922 { 1923 struct sock *nsk; 1924 struct iucv_sock *iucv, *niucv; 1925 struct af_iucv_trans_hdr *trans_hdr; 1926 int err; 1927 1928 iucv = iucv_sk(sk); 1929 trans_hdr = (struct af_iucv_trans_hdr *)skb->data; 1930 if (!iucv) { 1931 /* no sock - connection refused */ 1932 afiucv_swap_src_dest(skb); 1933 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1934 err = dev_queue_xmit(skb); 1935 goto out; 1936 } 1937 1938 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); 1939 bh_lock_sock(sk); 1940 if ((sk->sk_state != IUCV_LISTEN) || 1941 sk_acceptq_is_full(sk) || 1942 !nsk) { 1943 /* error on server socket - connection refused */ 1944 if (nsk) 1945 sk_free(nsk); 1946 afiucv_swap_src_dest(skb); 1947 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1948 err = dev_queue_xmit(skb); 1949 bh_unlock_sock(sk); 1950 goto out; 1951 } 1952 1953 niucv = iucv_sk(nsk); 1954 iucv_sock_init(nsk, sk); 1955 niucv->transport = AF_IUCV_TRANS_HIPER; 1956 niucv->msglimit = iucv->msglimit; 1957 if (!trans_hdr->window) 1958 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; 1959 else 1960 niucv->msglimit_peer = trans_hdr->window; 1961 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); 1962 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); 1963 memcpy(niucv->src_name, iucv->src_name, 8); 1964 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1965 nsk->sk_bound_dev_if = sk->sk_bound_dev_if; 1966 niucv->hs_dev = iucv->hs_dev; 1967 dev_hold(niucv->hs_dev); 1968 afiucv_swap_src_dest(skb); 1969 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; 1970 trans_hdr->window = niucv->msglimit; 1971 /* if receiver acks the xmit connection is established */ 1972 err = dev_queue_xmit(skb); 1973 if (!err) { 1974 iucv_accept_enqueue(sk, nsk); 1975 nsk->sk_state = IUCV_CONNECTED; 1976 sk->sk_data_ready(sk, 1); 1977 } else 1978 iucv_sock_kill(nsk); 1979 bh_unlock_sock(sk); 1980 1981 out: 1982 return NET_RX_SUCCESS; 1983 } 1984 1985 /** 1986 * afiucv_hs_callback_synack() - react on received SYN-ACK 1987 **/ 1988 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) 1989 { 1990 struct iucv_sock *iucv = iucv_sk(sk); 1991 struct af_iucv_trans_hdr *trans_hdr = 1992 (struct af_iucv_trans_hdr *)skb->data; 1993 1994 if (!iucv) 1995 goto out; 1996 if (sk->sk_state != IUCV_BOUND) 1997 goto out; 1998 bh_lock_sock(sk); 1999 iucv->msglimit_peer = trans_hdr->window; 2000 sk->sk_state = IUCV_CONNECTED; 2001 sk->sk_state_change(sk); 2002 bh_unlock_sock(sk); 2003 out: 2004 kfree_skb(skb); 2005 return NET_RX_SUCCESS; 2006 } 2007 2008 /** 2009 * afiucv_hs_callback_synfin() - react on received SYN_FIN 2010 **/ 2011 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) 2012 { 2013 struct iucv_sock *iucv = iucv_sk(sk); 2014 2015 if (!iucv) 2016 goto out; 2017 if (sk->sk_state != IUCV_BOUND) 2018 goto out; 2019 bh_lock_sock(sk); 2020 sk->sk_state = IUCV_DISCONN; 2021 sk->sk_state_change(sk); 2022 bh_unlock_sock(sk); 2023 out: 2024 kfree_skb(skb); 2025 return NET_RX_SUCCESS; 2026 } 2027 2028 /** 2029 * afiucv_hs_callback_fin() - react on received FIN 2030 **/ 2031 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) 2032 { 2033 struct iucv_sock *iucv = iucv_sk(sk); 2034 2035 /* other end of connection closed */ 2036 if (!iucv) 2037 goto out; 2038 bh_lock_sock(sk); 2039 if (sk->sk_state == IUCV_CONNECTED) { 2040 sk->sk_state = IUCV_DISCONN; 2041 sk->sk_state_change(sk); 2042 } 2043 bh_unlock_sock(sk); 2044 out: 2045 kfree_skb(skb); 2046 return NET_RX_SUCCESS; 2047 } 2048 2049 /** 2050 * afiucv_hs_callback_win() - react on received WIN 2051 **/ 2052 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) 2053 { 2054 struct iucv_sock *iucv = iucv_sk(sk); 2055 struct af_iucv_trans_hdr *trans_hdr = 2056 (struct af_iucv_trans_hdr *)skb->data; 2057 2058 if (!iucv) 2059 return NET_RX_SUCCESS; 2060 2061 if (sk->sk_state != IUCV_CONNECTED) 2062 return NET_RX_SUCCESS; 2063 2064 atomic_sub(trans_hdr->window, &iucv->msg_sent); 2065 iucv_sock_wake_msglim(sk); 2066 return NET_RX_SUCCESS; 2067 } 2068 2069 /** 2070 * afiucv_hs_callback_rx() - react on received data 2071 **/ 2072 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) 2073 { 2074 struct iucv_sock *iucv = iucv_sk(sk); 2075 2076 if (!iucv) { 2077 kfree_skb(skb); 2078 return NET_RX_SUCCESS; 2079 } 2080 2081 if (sk->sk_state != IUCV_CONNECTED) { 2082 kfree_skb(skb); 2083 return NET_RX_SUCCESS; 2084 } 2085 2086 if (sk->sk_shutdown & RCV_SHUTDOWN) { 2087 kfree_skb(skb); 2088 return NET_RX_SUCCESS; 2089 } 2090 2091 /* write stuff from iucv_msg to skb cb */ 2092 if (skb->len < sizeof(struct af_iucv_trans_hdr)) { 2093 kfree_skb(skb); 2094 return NET_RX_SUCCESS; 2095 } 2096 skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); 2097 skb_reset_transport_header(skb); 2098 skb_reset_network_header(skb); 2099 spin_lock(&iucv->message_q.lock); 2100 if (skb_queue_empty(&iucv->backlog_skb_q)) { 2101 if (sock_queue_rcv_skb(sk, skb)) { 2102 /* handle rcv queue full */ 2103 skb_queue_tail(&iucv->backlog_skb_q, skb); 2104 } 2105 } else 2106 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 2107 spin_unlock(&iucv->message_q.lock); 2108 return NET_RX_SUCCESS; 2109 } 2110 2111 /** 2112 * afiucv_hs_rcv() - base function for arriving data through HiperSockets 2113 * transport 2114 * called from netif RX softirq 2115 **/ 2116 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 2117 struct packet_type *pt, struct net_device *orig_dev) 2118 { 2119 struct hlist_node *node; 2120 struct sock *sk; 2121 struct iucv_sock *iucv; 2122 struct af_iucv_trans_hdr *trans_hdr; 2123 char nullstring[8]; 2124 int err = 0; 2125 2126 skb_pull(skb, ETH_HLEN); 2127 trans_hdr = (struct af_iucv_trans_hdr *)skb->data; 2128 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 2129 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 2130 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 2131 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 2132 memset(nullstring, 0, sizeof(nullstring)); 2133 iucv = NULL; 2134 sk = NULL; 2135 read_lock(&iucv_sk_list.lock); 2136 sk_for_each(sk, node, &iucv_sk_list.head) { 2137 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { 2138 if ((!memcmp(&iucv_sk(sk)->src_name, 2139 trans_hdr->destAppName, 8)) && 2140 (!memcmp(&iucv_sk(sk)->src_user_id, 2141 trans_hdr->destUserID, 8)) && 2142 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && 2143 (!memcmp(&iucv_sk(sk)->dst_user_id, 2144 nullstring, 8))) { 2145 iucv = iucv_sk(sk); 2146 break; 2147 } 2148 } else { 2149 if ((!memcmp(&iucv_sk(sk)->src_name, 2150 trans_hdr->destAppName, 8)) && 2151 (!memcmp(&iucv_sk(sk)->src_user_id, 2152 trans_hdr->destUserID, 8)) && 2153 (!memcmp(&iucv_sk(sk)->dst_name, 2154 trans_hdr->srcAppName, 8)) && 2155 (!memcmp(&iucv_sk(sk)->dst_user_id, 2156 trans_hdr->srcUserID, 8))) { 2157 iucv = iucv_sk(sk); 2158 break; 2159 } 2160 } 2161 } 2162 read_unlock(&iucv_sk_list.lock); 2163 if (!iucv) 2164 sk = NULL; 2165 2166 /* no sock 2167 how should we send with no sock 2168 1) send without sock no send rc checking? 2169 2) introduce default sock to handle this cases 2170 2171 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case 2172 data -> send FIN 2173 SYN|ACK, SYN|FIN, FIN -> no action? */ 2174 2175 switch (trans_hdr->flags) { 2176 case AF_IUCV_FLAG_SYN: 2177 /* connect request */ 2178 err = afiucv_hs_callback_syn(sk, skb); 2179 break; 2180 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): 2181 /* connect request confirmed */ 2182 err = afiucv_hs_callback_synack(sk, skb); 2183 break; 2184 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): 2185 /* connect request refused */ 2186 err = afiucv_hs_callback_synfin(sk, skb); 2187 break; 2188 case (AF_IUCV_FLAG_FIN): 2189 /* close request */ 2190 err = afiucv_hs_callback_fin(sk, skb); 2191 break; 2192 case (AF_IUCV_FLAG_WIN): 2193 err = afiucv_hs_callback_win(sk, skb); 2194 if (skb->len == sizeof(struct af_iucv_trans_hdr)) { 2195 kfree_skb(skb); 2196 break; 2197 } 2198 /* fall through and receive non-zero length data */ 2199 case (AF_IUCV_FLAG_SHT): 2200 /* shutdown request */ 2201 /* fall through and receive zero length data */ 2202 case 0: 2203 /* plain data frame */ 2204 memcpy(CB_TRGCLS(skb), &trans_hdr->iucv_hdr.class, 2205 CB_TRGCLS_LEN); 2206 err = afiucv_hs_callback_rx(sk, skb); 2207 break; 2208 default: 2209 ; 2210 } 2211 2212 return err; 2213 } 2214 2215 /** 2216 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets 2217 * transport 2218 **/ 2219 static void afiucv_hs_callback_txnotify(struct sk_buff *skb, 2220 enum iucv_tx_notify n) 2221 { 2222 struct sock *isk = skb->sk; 2223 struct sock *sk = NULL; 2224 struct iucv_sock *iucv = NULL; 2225 struct sk_buff_head *list; 2226 struct sk_buff *list_skb; 2227 struct sk_buff *nskb; 2228 unsigned long flags; 2229 struct hlist_node *node; 2230 2231 read_lock_irqsave(&iucv_sk_list.lock, flags); 2232 sk_for_each(sk, node, &iucv_sk_list.head) 2233 if (sk == isk) { 2234 iucv = iucv_sk(sk); 2235 break; 2236 } 2237 read_unlock_irqrestore(&iucv_sk_list.lock, flags); 2238 2239 if (!iucv || sock_flag(sk, SOCK_ZAPPED)) 2240 return; 2241 2242 list = &iucv->send_skb_q; 2243 spin_lock_irqsave(&list->lock, flags); 2244 if (skb_queue_empty(list)) 2245 goto out_unlock; 2246 list_skb = list->next; 2247 nskb = list_skb->next; 2248 while (list_skb != (struct sk_buff *)list) { 2249 if (skb_shinfo(list_skb) == skb_shinfo(skb)) { 2250 switch (n) { 2251 case TX_NOTIFY_OK: 2252 __skb_unlink(list_skb, list); 2253 kfree_skb(list_skb); 2254 iucv_sock_wake_msglim(sk); 2255 break; 2256 case TX_NOTIFY_PENDING: 2257 atomic_inc(&iucv->pendings); 2258 break; 2259 case TX_NOTIFY_DELAYED_OK: 2260 __skb_unlink(list_skb, list); 2261 atomic_dec(&iucv->pendings); 2262 if (atomic_read(&iucv->pendings) <= 0) 2263 iucv_sock_wake_msglim(sk); 2264 kfree_skb(list_skb); 2265 break; 2266 case TX_NOTIFY_UNREACHABLE: 2267 case TX_NOTIFY_DELAYED_UNREACHABLE: 2268 case TX_NOTIFY_TPQFULL: /* not yet used */ 2269 case TX_NOTIFY_GENERALERROR: 2270 case TX_NOTIFY_DELAYED_GENERALERROR: 2271 __skb_unlink(list_skb, list); 2272 kfree_skb(list_skb); 2273 if (sk->sk_state == IUCV_CONNECTED) { 2274 sk->sk_state = IUCV_DISCONN; 2275 sk->sk_state_change(sk); 2276 } 2277 break; 2278 } 2279 break; 2280 } 2281 list_skb = nskb; 2282 nskb = nskb->next; 2283 } 2284 out_unlock: 2285 spin_unlock_irqrestore(&list->lock, flags); 2286 2287 if (sk->sk_state == IUCV_CLOSING) { 2288 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 2289 sk->sk_state = IUCV_CLOSED; 2290 sk->sk_state_change(sk); 2291 } 2292 } 2293 2294 } 2295 2296 /* 2297 * afiucv_netdev_event: handle netdev notifier chain events 2298 */ 2299 static int afiucv_netdev_event(struct notifier_block *this, 2300 unsigned long event, void *ptr) 2301 { 2302 struct net_device *event_dev = (struct net_device *)ptr; 2303 struct hlist_node *node; 2304 struct sock *sk; 2305 struct iucv_sock *iucv; 2306 2307 switch (event) { 2308 case NETDEV_REBOOT: 2309 case NETDEV_GOING_DOWN: 2310 sk_for_each(sk, node, &iucv_sk_list.head) { 2311 iucv = iucv_sk(sk); 2312 if ((iucv->hs_dev == event_dev) && 2313 (sk->sk_state == IUCV_CONNECTED)) { 2314 if (event == NETDEV_GOING_DOWN) 2315 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 2316 sk->sk_state = IUCV_DISCONN; 2317 sk->sk_state_change(sk); 2318 } 2319 } 2320 break; 2321 case NETDEV_DOWN: 2322 case NETDEV_UNREGISTER: 2323 default: 2324 break; 2325 } 2326 return NOTIFY_DONE; 2327 } 2328 2329 static struct notifier_block afiucv_netdev_notifier = { 2330 .notifier_call = afiucv_netdev_event, 2331 }; 2332 2333 static const struct proto_ops iucv_sock_ops = { 2334 .family = PF_IUCV, 2335 .owner = THIS_MODULE, 2336 .release = iucv_sock_release, 2337 .bind = iucv_sock_bind, 2338 .connect = iucv_sock_connect, 2339 .listen = iucv_sock_listen, 2340 .accept = iucv_sock_accept, 2341 .getname = iucv_sock_getname, 2342 .sendmsg = iucv_sock_sendmsg, 2343 .recvmsg = iucv_sock_recvmsg, 2344 .poll = iucv_sock_poll, 2345 .ioctl = sock_no_ioctl, 2346 .mmap = sock_no_mmap, 2347 .socketpair = sock_no_socketpair, 2348 .shutdown = iucv_sock_shutdown, 2349 .setsockopt = iucv_sock_setsockopt, 2350 .getsockopt = iucv_sock_getsockopt, 2351 }; 2352 2353 static const struct net_proto_family iucv_sock_family_ops = { 2354 .family = AF_IUCV, 2355 .owner = THIS_MODULE, 2356 .create = iucv_sock_create, 2357 }; 2358 2359 static struct packet_type iucv_packet_type = { 2360 .type = cpu_to_be16(ETH_P_AF_IUCV), 2361 .func = afiucv_hs_rcv, 2362 }; 2363 2364 static int afiucv_iucv_init(void) 2365 { 2366 int err; 2367 2368 err = pr_iucv->iucv_register(&af_iucv_handler, 0); 2369 if (err) 2370 goto out; 2371 /* establish dummy device */ 2372 af_iucv_driver.bus = pr_iucv->bus; 2373 err = driver_register(&af_iucv_driver); 2374 if (err) 2375 goto out_iucv; 2376 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); 2377 if (!af_iucv_dev) { 2378 err = -ENOMEM; 2379 goto out_driver; 2380 } 2381 dev_set_name(af_iucv_dev, "af_iucv"); 2382 af_iucv_dev->bus = pr_iucv->bus; 2383 af_iucv_dev->parent = pr_iucv->root; 2384 af_iucv_dev->release = (void (*)(struct device *))kfree; 2385 af_iucv_dev->driver = &af_iucv_driver; 2386 err = device_register(af_iucv_dev); 2387 if (err) 2388 goto out_driver; 2389 return 0; 2390 2391 out_driver: 2392 driver_unregister(&af_iucv_driver); 2393 out_iucv: 2394 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2395 out: 2396 return err; 2397 } 2398 2399 static int __init afiucv_init(void) 2400 { 2401 int err; 2402 2403 if (MACHINE_IS_VM) { 2404 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); 2405 if (unlikely(err)) { 2406 WARN_ON(err); 2407 err = -EPROTONOSUPPORT; 2408 goto out; 2409 } 2410 2411 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); 2412 if (!pr_iucv) { 2413 printk(KERN_WARNING "iucv_if lookup failed\n"); 2414 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2415 } 2416 } else { 2417 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2418 pr_iucv = NULL; 2419 } 2420 2421 err = proto_register(&iucv_proto, 0); 2422 if (err) 2423 goto out; 2424 err = sock_register(&iucv_sock_family_ops); 2425 if (err) 2426 goto out_proto; 2427 2428 if (pr_iucv) { 2429 err = afiucv_iucv_init(); 2430 if (err) 2431 goto out_sock; 2432 } else 2433 register_netdevice_notifier(&afiucv_netdev_notifier); 2434 dev_add_pack(&iucv_packet_type); 2435 return 0; 2436 2437 out_sock: 2438 sock_unregister(PF_IUCV); 2439 out_proto: 2440 proto_unregister(&iucv_proto); 2441 out: 2442 if (pr_iucv) 2443 symbol_put(iucv_if); 2444 return err; 2445 } 2446 2447 static void __exit afiucv_exit(void) 2448 { 2449 if (pr_iucv) { 2450 device_unregister(af_iucv_dev); 2451 driver_unregister(&af_iucv_driver); 2452 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2453 symbol_put(iucv_if); 2454 } else 2455 unregister_netdevice_notifier(&afiucv_netdev_notifier); 2456 dev_remove_pack(&iucv_packet_type); 2457 sock_unregister(PF_IUCV); 2458 proto_unregister(&iucv_proto); 2459 } 2460 2461 module_init(afiucv_init); 2462 module_exit(afiucv_exit); 2463 2464 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); 2465 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); 2466 MODULE_VERSION(VERSION); 2467 MODULE_LICENSE("GPL"); 2468 MODULE_ALIAS_NETPROTO(PF_IUCV); 2469 2470