af_decnet.c revision 09640e6365c679b5642b1c41b6d7078f51689ddf
1 2/* 3 * DECnet An implementation of the DECnet protocol suite for the LINUX 4 * operating system. DECnet is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * DECnet Socket Layer Interface 8 * 9 * Authors: Eduardo Marcelo Serrat <emserrat@geocities.com> 10 * Patrick Caulfield <patrick@pandh.demon.co.uk> 11 * 12 * Changes: 13 * Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's 14 * version of the code. Original copyright preserved 15 * below. 16 * Steve Whitehouse: Some bug fixes, cleaning up some code to make it 17 * compatible with my routing layer. 18 * Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick 19 * Caulfield. 20 * Steve Whitehouse: Further bug fixes, checking module code still works 21 * with new routing layer. 22 * Steve Whitehouse: Additional set/get_sockopt() calls. 23 * Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new 24 * code. 25 * Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like 26 * way. Didn't manage it entirely, but its better. 27 * Steve Whitehouse: ditto for sendmsg(). 28 * Steve Whitehouse: A selection of bug fixes to various things. 29 * Steve Whitehouse: Added TIOCOUTQ ioctl. 30 * Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username. 31 * Steve Whitehouse: Fixes to connect() error returns. 32 * Patrick Caulfield: Fixes to delayed acceptance logic. 33 * David S. Miller: New socket locking 34 * Steve Whitehouse: Socket list hashing/locking 35 * Arnaldo C. Melo: use capable, not suser 36 * Steve Whitehouse: Removed unused code. Fix to use sk->allocation 37 * when required. 38 * Patrick Caulfield: /proc/net/decnet now has object name/number 39 * Steve Whitehouse: Fixed local port allocation, hashed sk list 40 * Matthew Wilcox: Fixes for dn_ioctl() 41 * Steve Whitehouse: New connect/accept logic to allow timeouts and 42 * prepare for sendpage etc. 43 */ 44 45 46/****************************************************************************** 47 (c) 1995-1998 E.M. Serrat emserrat@geocities.com 48 49 This program is free software; you can redistribute it and/or modify 50 it under the terms of the GNU General Public License as published by 51 the Free Software Foundation; either version 2 of the License, or 52 any later version. 53 54 This program is distributed in the hope that it will be useful, 55 but WITHOUT ANY WARRANTY; without even the implied warranty of 56 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 57 GNU General Public License for more details. 58 59HISTORY: 60 61Version Kernel Date Author/Comments 62------- ------ ---- --------------- 63Version 0.0.1 2.0.30 01-dic-97 Eduardo Marcelo Serrat 64 (emserrat@geocities.com) 65 66 First Development of DECnet Socket La- 67 yer for Linux. Only supports outgoing 68 connections. 69 70Version 0.0.2 2.1.105 20-jun-98 Patrick J. Caulfield 71 (patrick@pandh.demon.co.uk) 72 73 Port to new kernel development version. 74 75Version 0.0.3 2.1.106 25-jun-98 Eduardo Marcelo Serrat 76 (emserrat@geocities.com) 77 _ 78 Added support for incoming connections 79 so we can start developing server apps 80 on Linux. 81 - 82 Module Support 83Version 0.0.4 2.1.109 21-jul-98 Eduardo Marcelo Serrat 84 (emserrat@geocities.com) 85 _ 86 Added support for X11R6.4. Now we can 87 use DECnet transport for X on Linux!!! 88 - 89Version 0.0.5 2.1.110 01-aug-98 Eduardo Marcelo Serrat 90 (emserrat@geocities.com) 91 Removed bugs on flow control 92 Removed bugs on incoming accessdata 93 order 94 - 95Version 0.0.6 2.1.110 07-aug-98 Eduardo Marcelo Serrat 96 dn_recvmsg fixes 97 98 Patrick J. Caulfield 99 dn_bind fixes 100*******************************************************************************/ 101 102#include <linux/module.h> 103#include <linux/errno.h> 104#include <linux/types.h> 105#include <linux/slab.h> 106#include <linux/socket.h> 107#include <linux/in.h> 108#include <linux/kernel.h> 109#include <linux/sched.h> 110#include <linux/timer.h> 111#include <linux/string.h> 112#include <linux/sockios.h> 113#include <linux/net.h> 114#include <linux/netdevice.h> 115#include <linux/inet.h> 116#include <linux/route.h> 117#include <linux/netfilter.h> 118#include <linux/seq_file.h> 119#include <net/sock.h> 120#include <net/tcp_states.h> 121#include <net/flow.h> 122#include <asm/system.h> 123#include <asm/ioctls.h> 124#include <linux/capability.h> 125#include <linux/mm.h> 126#include <linux/interrupt.h> 127#include <linux/proc_fs.h> 128#include <linux/stat.h> 129#include <linux/init.h> 130#include <linux/poll.h> 131#include <net/net_namespace.h> 132#include <net/neighbour.h> 133#include <net/dst.h> 134#include <net/fib_rules.h> 135#include <net/dn.h> 136#include <net/dn_nsp.h> 137#include <net/dn_dev.h> 138#include <net/dn_route.h> 139#include <net/dn_fib.h> 140#include <net/dn_neigh.h> 141 142struct dn_sock { 143 struct sock sk; 144 struct dn_scp scp; 145}; 146 147static void dn_keepalive(struct sock *sk); 148 149#define DN_SK_HASH_SHIFT 8 150#define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT) 151#define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1) 152 153 154static const struct proto_ops dn_proto_ops; 155static DEFINE_RWLOCK(dn_hash_lock); 156static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE]; 157static struct hlist_head dn_wild_sk; 158static atomic_t decnet_memory_allocated; 159 160static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen, int flags); 161static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags); 162 163static struct hlist_head *dn_find_list(struct sock *sk) 164{ 165 struct dn_scp *scp = DN_SK(sk); 166 167 if (scp->addr.sdn_flags & SDF_WILD) 168 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL; 169 170 return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK]; 171} 172 173/* 174 * Valid ports are those greater than zero and not already in use. 175 */ 176static int check_port(__le16 port) 177{ 178 struct sock *sk; 179 struct hlist_node *node; 180 181 if (port == 0) 182 return -1; 183 184 sk_for_each(sk, node, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) { 185 struct dn_scp *scp = DN_SK(sk); 186 if (scp->addrloc == port) 187 return -1; 188 } 189 return 0; 190} 191 192static unsigned short port_alloc(struct sock *sk) 193{ 194 struct dn_scp *scp = DN_SK(sk); 195static unsigned short port = 0x2000; 196 unsigned short i_port = port; 197 198 while(check_port(cpu_to_le16(++port)) != 0) { 199 if (port == i_port) 200 return 0; 201 } 202 203 scp->addrloc = cpu_to_le16(port); 204 205 return 1; 206} 207 208/* 209 * Since this is only ever called from user 210 * level, we don't need a write_lock() version 211 * of this. 212 */ 213static int dn_hash_sock(struct sock *sk) 214{ 215 struct dn_scp *scp = DN_SK(sk); 216 struct hlist_head *list; 217 int rv = -EUSERS; 218 219 BUG_ON(sk_hashed(sk)); 220 221 write_lock_bh(&dn_hash_lock); 222 223 if (!scp->addrloc && !port_alloc(sk)) 224 goto out; 225 226 rv = -EADDRINUSE; 227 if ((list = dn_find_list(sk)) == NULL) 228 goto out; 229 230 sk_add_node(sk, list); 231 rv = 0; 232out: 233 write_unlock_bh(&dn_hash_lock); 234 return rv; 235} 236 237static void dn_unhash_sock(struct sock *sk) 238{ 239 write_lock(&dn_hash_lock); 240 sk_del_node_init(sk); 241 write_unlock(&dn_hash_lock); 242} 243 244static void dn_unhash_sock_bh(struct sock *sk) 245{ 246 write_lock_bh(&dn_hash_lock); 247 sk_del_node_init(sk); 248 write_unlock_bh(&dn_hash_lock); 249} 250 251static struct hlist_head *listen_hash(struct sockaddr_dn *addr) 252{ 253 int i; 254 unsigned hash = addr->sdn_objnum; 255 256 if (hash == 0) { 257 hash = addr->sdn_objnamel; 258 for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) { 259 hash ^= addr->sdn_objname[i]; 260 hash ^= (hash << 3); 261 } 262 } 263 264 return &dn_sk_hash[hash & DN_SK_HASH_MASK]; 265} 266 267/* 268 * Called to transform a socket from bound (i.e. with a local address) 269 * into a listening socket (doesn't need a local port number) and rehashes 270 * based upon the object name/number. 271 */ 272static void dn_rehash_sock(struct sock *sk) 273{ 274 struct hlist_head *list; 275 struct dn_scp *scp = DN_SK(sk); 276 277 if (scp->addr.sdn_flags & SDF_WILD) 278 return; 279 280 write_lock_bh(&dn_hash_lock); 281 sk_del_node_init(sk); 282 DN_SK(sk)->addrloc = 0; 283 list = listen_hash(&DN_SK(sk)->addr); 284 sk_add_node(sk, list); 285 write_unlock_bh(&dn_hash_lock); 286} 287 288int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type) 289{ 290 int len = 2; 291 292 *buf++ = type; 293 294 switch(type) { 295 case 0: 296 *buf++ = sdn->sdn_objnum; 297 break; 298 case 1: 299 *buf++ = 0; 300 *buf++ = le16_to_cpu(sdn->sdn_objnamel); 301 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel)); 302 len = 3 + le16_to_cpu(sdn->sdn_objnamel); 303 break; 304 case 2: 305 memset(buf, 0, 5); 306 buf += 5; 307 *buf++ = le16_to_cpu(sdn->sdn_objnamel); 308 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel)); 309 len = 7 + le16_to_cpu(sdn->sdn_objnamel); 310 break; 311 } 312 313 return len; 314} 315 316/* 317 * On reception of usernames, we handle types 1 and 0 for destination 318 * addresses only. Types 2 and 4 are used for source addresses, but the 319 * UIC, GIC are ignored and they are both treated the same way. Type 3 320 * is never used as I've no idea what its purpose might be or what its 321 * format is. 322 */ 323int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt) 324{ 325 unsigned char type; 326 int size = len; 327 int namel = 12; 328 329 sdn->sdn_objnum = 0; 330 sdn->sdn_objnamel = cpu_to_le16(0); 331 memset(sdn->sdn_objname, 0, DN_MAXOBJL); 332 333 if (len < 2) 334 return -1; 335 336 len -= 2; 337 *fmt = *data++; 338 type = *data++; 339 340 switch(*fmt) { 341 case 0: 342 sdn->sdn_objnum = type; 343 return 2; 344 case 1: 345 namel = 16; 346 break; 347 case 2: 348 len -= 4; 349 data += 4; 350 break; 351 case 4: 352 len -= 8; 353 data += 8; 354 break; 355 default: 356 return -1; 357 } 358 359 len -= 1; 360 361 if (len < 0) 362 return -1; 363 364 sdn->sdn_objnamel = cpu_to_le16(*data++); 365 len -= le16_to_cpu(sdn->sdn_objnamel); 366 367 if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel)) 368 return -1; 369 370 memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel)); 371 372 return size - len; 373} 374 375struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr) 376{ 377 struct hlist_head *list = listen_hash(addr); 378 struct hlist_node *node; 379 struct sock *sk; 380 381 read_lock(&dn_hash_lock); 382 sk_for_each(sk, node, list) { 383 struct dn_scp *scp = DN_SK(sk); 384 if (sk->sk_state != TCP_LISTEN) 385 continue; 386 if (scp->addr.sdn_objnum) { 387 if (scp->addr.sdn_objnum != addr->sdn_objnum) 388 continue; 389 } else { 390 if (addr->sdn_objnum) 391 continue; 392 if (scp->addr.sdn_objnamel != addr->sdn_objnamel) 393 continue; 394 if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0) 395 continue; 396 } 397 sock_hold(sk); 398 read_unlock(&dn_hash_lock); 399 return sk; 400 } 401 402 sk = sk_head(&dn_wild_sk); 403 if (sk) { 404 if (sk->sk_state == TCP_LISTEN) 405 sock_hold(sk); 406 else 407 sk = NULL; 408 } 409 410 read_unlock(&dn_hash_lock); 411 return sk; 412} 413 414struct sock *dn_find_by_skb(struct sk_buff *skb) 415{ 416 struct dn_skb_cb *cb = DN_SKB_CB(skb); 417 struct sock *sk; 418 struct hlist_node *node; 419 struct dn_scp *scp; 420 421 read_lock(&dn_hash_lock); 422 sk_for_each(sk, node, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) { 423 scp = DN_SK(sk); 424 if (cb->src != dn_saddr2dn(&scp->peer)) 425 continue; 426 if (cb->dst_port != scp->addrloc) 427 continue; 428 if (scp->addrrem && (cb->src_port != scp->addrrem)) 429 continue; 430 sock_hold(sk); 431 goto found; 432 } 433 sk = NULL; 434found: 435 read_unlock(&dn_hash_lock); 436 return sk; 437} 438 439 440 441static void dn_destruct(struct sock *sk) 442{ 443 struct dn_scp *scp = DN_SK(sk); 444 445 skb_queue_purge(&scp->data_xmit_queue); 446 skb_queue_purge(&scp->other_xmit_queue); 447 skb_queue_purge(&scp->other_receive_queue); 448 449 dst_release(xchg(&sk->sk_dst_cache, NULL)); 450} 451 452static int dn_memory_pressure; 453 454static void dn_enter_memory_pressure(struct sock *sk) 455{ 456 if (!dn_memory_pressure) { 457 dn_memory_pressure = 1; 458 } 459} 460 461static struct proto dn_proto = { 462 .name = "NSP", 463 .owner = THIS_MODULE, 464 .enter_memory_pressure = dn_enter_memory_pressure, 465 .memory_pressure = &dn_memory_pressure, 466 .memory_allocated = &decnet_memory_allocated, 467 .sysctl_mem = sysctl_decnet_mem, 468 .sysctl_wmem = sysctl_decnet_wmem, 469 .sysctl_rmem = sysctl_decnet_rmem, 470 .max_header = DN_MAX_NSP_DATA_HEADER + 64, 471 .obj_size = sizeof(struct dn_sock), 472}; 473 474static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp) 475{ 476 struct dn_scp *scp; 477 struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto); 478 479 if (!sk) 480 goto out; 481 482 if (sock) 483 sock->ops = &dn_proto_ops; 484 sock_init_data(sock, sk); 485 486 sk->sk_backlog_rcv = dn_nsp_backlog_rcv; 487 sk->sk_destruct = dn_destruct; 488 sk->sk_no_check = 1; 489 sk->sk_family = PF_DECnet; 490 sk->sk_protocol = 0; 491 sk->sk_allocation = gfp; 492 sk->sk_sndbuf = sysctl_decnet_wmem[1]; 493 sk->sk_rcvbuf = sysctl_decnet_rmem[1]; 494 495 /* Initialization of DECnet Session Control Port */ 496 scp = DN_SK(sk); 497 scp->state = DN_O; /* Open */ 498 scp->numdat = 1; /* Next data seg to tx */ 499 scp->numoth = 1; /* Next oth data to tx */ 500 scp->ackxmt_dat = 0; /* Last data seg ack'ed */ 501 scp->ackxmt_oth = 0; /* Last oth data ack'ed */ 502 scp->ackrcv_dat = 0; /* Highest data ack recv*/ 503 scp->ackrcv_oth = 0; /* Last oth data ack rec*/ 504 scp->flowrem_sw = DN_SEND; 505 scp->flowloc_sw = DN_SEND; 506 scp->flowrem_dat = 0; 507 scp->flowrem_oth = 1; 508 scp->flowloc_dat = 0; 509 scp->flowloc_oth = 1; 510 scp->services_rem = 0; 511 scp->services_loc = 1 | NSP_FC_NONE; 512 scp->info_rem = 0; 513 scp->info_loc = 0x03; /* NSP version 4.1 */ 514 scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */ 515 scp->nonagle = 0; 516 scp->multi_ireq = 1; 517 scp->accept_mode = ACC_IMMED; 518 scp->addr.sdn_family = AF_DECnet; 519 scp->peer.sdn_family = AF_DECnet; 520 scp->accessdata.acc_accl = 5; 521 memcpy(scp->accessdata.acc_acc, "LINUX", 5); 522 523 scp->max_window = NSP_MAX_WINDOW; 524 scp->snd_window = NSP_MIN_WINDOW; 525 scp->nsp_srtt = NSP_INITIAL_SRTT; 526 scp->nsp_rttvar = NSP_INITIAL_RTTVAR; 527 scp->nsp_rxtshift = 0; 528 529 skb_queue_head_init(&scp->data_xmit_queue); 530 skb_queue_head_init(&scp->other_xmit_queue); 531 skb_queue_head_init(&scp->other_receive_queue); 532 533 scp->persist = 0; 534 scp->persist_fxn = NULL; 535 scp->keepalive = 10 * HZ; 536 scp->keepalive_fxn = dn_keepalive; 537 538 init_timer(&scp->delack_timer); 539 scp->delack_pending = 0; 540 scp->delack_fxn = dn_nsp_delayed_ack; 541 542 dn_start_slow_timer(sk); 543out: 544 return sk; 545} 546 547/* 548 * Keepalive timer. 549 * FIXME: Should respond to SO_KEEPALIVE etc. 550 */ 551static void dn_keepalive(struct sock *sk) 552{ 553 struct dn_scp *scp = DN_SK(sk); 554 555 /* 556 * By checking the other_data transmit queue is empty 557 * we are double checking that we are not sending too 558 * many of these keepalive frames. 559 */ 560 if (skb_queue_empty(&scp->other_xmit_queue)) 561 dn_nsp_send_link(sk, DN_NOCHANGE, 0); 562} 563 564 565/* 566 * Timer for shutdown/destroyed sockets. 567 * When socket is dead & no packets have been sent for a 568 * certain amount of time, they are removed by this 569 * routine. Also takes care of sending out DI & DC 570 * frames at correct times. 571 */ 572int dn_destroy_timer(struct sock *sk) 573{ 574 struct dn_scp *scp = DN_SK(sk); 575 576 scp->persist = dn_nsp_persist(sk); 577 578 switch(scp->state) { 579 case DN_DI: 580 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC); 581 if (scp->nsp_rxtshift >= decnet_di_count) 582 scp->state = DN_CN; 583 return 0; 584 585 case DN_DR: 586 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC); 587 if (scp->nsp_rxtshift >= decnet_dr_count) 588 scp->state = DN_DRC; 589 return 0; 590 591 case DN_DN: 592 if (scp->nsp_rxtshift < decnet_dn_count) { 593 /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */ 594 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC); 595 return 0; 596 } 597 } 598 599 scp->persist = (HZ * decnet_time_wait); 600 601 if (sk->sk_socket) 602 return 0; 603 604 if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) { 605 dn_unhash_sock(sk); 606 sock_put(sk); 607 return 1; 608 } 609 610 return 0; 611} 612 613static void dn_destroy_sock(struct sock *sk) 614{ 615 struct dn_scp *scp = DN_SK(sk); 616 617 scp->nsp_rxtshift = 0; /* reset back off */ 618 619 if (sk->sk_socket) { 620 if (sk->sk_socket->state != SS_UNCONNECTED) 621 sk->sk_socket->state = SS_DISCONNECTING; 622 } 623 624 sk->sk_state = TCP_CLOSE; 625 626 switch(scp->state) { 627 case DN_DN: 628 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, 629 sk->sk_allocation); 630 scp->persist_fxn = dn_destroy_timer; 631 scp->persist = dn_nsp_persist(sk); 632 break; 633 case DN_CR: 634 scp->state = DN_DR; 635 goto disc_reject; 636 case DN_RUN: 637 scp->state = DN_DI; 638 case DN_DI: 639 case DN_DR: 640disc_reject: 641 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation); 642 case DN_NC: 643 case DN_NR: 644 case DN_RJ: 645 case DN_DIC: 646 case DN_CN: 647 case DN_DRC: 648 case DN_CI: 649 case DN_CD: 650 scp->persist_fxn = dn_destroy_timer; 651 scp->persist = dn_nsp_persist(sk); 652 break; 653 default: 654 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n"); 655 case DN_O: 656 dn_stop_slow_timer(sk); 657 658 dn_unhash_sock_bh(sk); 659 sock_put(sk); 660 661 break; 662 } 663} 664 665char *dn_addr2asc(__u16 addr, char *buf) 666{ 667 unsigned short node, area; 668 669 node = addr & 0x03ff; 670 area = addr >> 10; 671 sprintf(buf, "%hd.%hd", area, node); 672 673 return buf; 674} 675 676 677 678static int dn_create(struct net *net, struct socket *sock, int protocol) 679{ 680 struct sock *sk; 681 682 if (net != &init_net) 683 return -EAFNOSUPPORT; 684 685 switch(sock->type) { 686 case SOCK_SEQPACKET: 687 if (protocol != DNPROTO_NSP) 688 return -EPROTONOSUPPORT; 689 break; 690 case SOCK_STREAM: 691 break; 692 default: 693 return -ESOCKTNOSUPPORT; 694 } 695 696 697 if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL)) == NULL) 698 return -ENOBUFS; 699 700 sk->sk_protocol = protocol; 701 702 return 0; 703} 704 705 706static int 707dn_release(struct socket *sock) 708{ 709 struct sock *sk = sock->sk; 710 711 if (sk) { 712 sock_orphan(sk); 713 sock_hold(sk); 714 lock_sock(sk); 715 dn_destroy_sock(sk); 716 release_sock(sk); 717 sock_put(sk); 718 } 719 720 return 0; 721} 722 723static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 724{ 725 struct sock *sk = sock->sk; 726 struct dn_scp *scp = DN_SK(sk); 727 struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr; 728 struct net_device *dev, *ldev; 729 int rv; 730 731 if (addr_len != sizeof(struct sockaddr_dn)) 732 return -EINVAL; 733 734 if (saddr->sdn_family != AF_DECnet) 735 return -EINVAL; 736 737 if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2)) 738 return -EINVAL; 739 740 if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL) 741 return -EINVAL; 742 743 if (saddr->sdn_flags & ~SDF_WILD) 744 return -EINVAL; 745 746 if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum || 747 (saddr->sdn_flags & SDF_WILD))) 748 return -EACCES; 749 750 if (!(saddr->sdn_flags & SDF_WILD)) { 751 if (le16_to_cpu(saddr->sdn_nodeaddrl)) { 752 read_lock(&dev_base_lock); 753 ldev = NULL; 754 for_each_netdev(&init_net, dev) { 755 if (!dev->dn_ptr) 756 continue; 757 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) { 758 ldev = dev; 759 break; 760 } 761 } 762 read_unlock(&dev_base_lock); 763 if (ldev == NULL) 764 return -EADDRNOTAVAIL; 765 } 766 } 767 768 rv = -EINVAL; 769 lock_sock(sk); 770 if (sock_flag(sk, SOCK_ZAPPED)) { 771 memcpy(&scp->addr, saddr, addr_len); 772 sock_reset_flag(sk, SOCK_ZAPPED); 773 774 rv = dn_hash_sock(sk); 775 if (rv) 776 sock_set_flag(sk, SOCK_ZAPPED); 777 } 778 release_sock(sk); 779 780 return rv; 781} 782 783 784static int dn_auto_bind(struct socket *sock) 785{ 786 struct sock *sk = sock->sk; 787 struct dn_scp *scp = DN_SK(sk); 788 int rv; 789 790 sock_reset_flag(sk, SOCK_ZAPPED); 791 792 scp->addr.sdn_flags = 0; 793 scp->addr.sdn_objnum = 0; 794 795 /* 796 * This stuff is to keep compatibility with Eduardo's 797 * patch. I hope I can dispense with it shortly... 798 */ 799 if ((scp->accessdata.acc_accl != 0) && 800 (scp->accessdata.acc_accl <= 12)) { 801 802 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl); 803 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel)); 804 805 scp->accessdata.acc_accl = 0; 806 memset(scp->accessdata.acc_acc, 0, 40); 807 } 808 /* End of compatibility stuff */ 809 810 scp->addr.sdn_add.a_len = cpu_to_le16(2); 811 rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr); 812 if (rv == 0) { 813 rv = dn_hash_sock(sk); 814 if (rv) 815 sock_set_flag(sk, SOCK_ZAPPED); 816 } 817 818 return rv; 819} 820 821static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation) 822{ 823 struct dn_scp *scp = DN_SK(sk); 824 DEFINE_WAIT(wait); 825 int err; 826 827 if (scp->state != DN_CR) 828 return -EINVAL; 829 830 scp->state = DN_CC; 831 scp->segsize_loc = dst_metric(__sk_dst_get(sk), RTAX_ADVMSS); 832 dn_send_conn_conf(sk, allocation); 833 834 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 835 for(;;) { 836 release_sock(sk); 837 if (scp->state == DN_CC) 838 *timeo = schedule_timeout(*timeo); 839 lock_sock(sk); 840 err = 0; 841 if (scp->state == DN_RUN) 842 break; 843 err = sock_error(sk); 844 if (err) 845 break; 846 err = sock_intr_errno(*timeo); 847 if (signal_pending(current)) 848 break; 849 err = -EAGAIN; 850 if (!*timeo) 851 break; 852 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 853 } 854 finish_wait(sk->sk_sleep, &wait); 855 if (err == 0) { 856 sk->sk_socket->state = SS_CONNECTED; 857 } else if (scp->state != DN_CC) { 858 sk->sk_socket->state = SS_UNCONNECTED; 859 } 860 return err; 861} 862 863static int dn_wait_run(struct sock *sk, long *timeo) 864{ 865 struct dn_scp *scp = DN_SK(sk); 866 DEFINE_WAIT(wait); 867 int err = 0; 868 869 if (scp->state == DN_RUN) 870 goto out; 871 872 if (!*timeo) 873 return -EALREADY; 874 875 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 876 for(;;) { 877 release_sock(sk); 878 if (scp->state == DN_CI || scp->state == DN_CC) 879 *timeo = schedule_timeout(*timeo); 880 lock_sock(sk); 881 err = 0; 882 if (scp->state == DN_RUN) 883 break; 884 err = sock_error(sk); 885 if (err) 886 break; 887 err = sock_intr_errno(*timeo); 888 if (signal_pending(current)) 889 break; 890 err = -ETIMEDOUT; 891 if (!*timeo) 892 break; 893 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 894 } 895 finish_wait(sk->sk_sleep, &wait); 896out: 897 if (err == 0) { 898 sk->sk_socket->state = SS_CONNECTED; 899 } else if (scp->state != DN_CI && scp->state != DN_CC) { 900 sk->sk_socket->state = SS_UNCONNECTED; 901 } 902 return err; 903} 904 905static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags) 906{ 907 struct socket *sock = sk->sk_socket; 908 struct dn_scp *scp = DN_SK(sk); 909 int err = -EISCONN; 910 struct flowi fl; 911 912 if (sock->state == SS_CONNECTED) 913 goto out; 914 915 if (sock->state == SS_CONNECTING) { 916 err = 0; 917 if (scp->state == DN_RUN) { 918 sock->state = SS_CONNECTED; 919 goto out; 920 } 921 err = -ECONNREFUSED; 922 if (scp->state != DN_CI && scp->state != DN_CC) { 923 sock->state = SS_UNCONNECTED; 924 goto out; 925 } 926 return dn_wait_run(sk, timeo); 927 } 928 929 err = -EINVAL; 930 if (scp->state != DN_O) 931 goto out; 932 933 if (addr == NULL || addrlen != sizeof(struct sockaddr_dn)) 934 goto out; 935 if (addr->sdn_family != AF_DECnet) 936 goto out; 937 if (addr->sdn_flags & SDF_WILD) 938 goto out; 939 940 if (sock_flag(sk, SOCK_ZAPPED)) { 941 err = dn_auto_bind(sk->sk_socket); 942 if (err) 943 goto out; 944 } 945 946 memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn)); 947 948 err = -EHOSTUNREACH; 949 memset(&fl, 0, sizeof(fl)); 950 fl.oif = sk->sk_bound_dev_if; 951 fl.fld_dst = dn_saddr2dn(&scp->peer); 952 fl.fld_src = dn_saddr2dn(&scp->addr); 953 dn_sk_ports_copy(&fl, scp); 954 fl.proto = DNPROTO_NSP; 955 if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, flags) < 0) 956 goto out; 957 sk->sk_route_caps = sk->sk_dst_cache->dev->features; 958 sock->state = SS_CONNECTING; 959 scp->state = DN_CI; 960 scp->segsize_loc = dst_metric(sk->sk_dst_cache, RTAX_ADVMSS); 961 962 dn_nsp_send_conninit(sk, NSP_CI); 963 err = -EINPROGRESS; 964 if (*timeo) { 965 err = dn_wait_run(sk, timeo); 966 } 967out: 968 return err; 969} 970 971static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags) 972{ 973 struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr; 974 struct sock *sk = sock->sk; 975 int err; 976 long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 977 978 lock_sock(sk); 979 err = __dn_connect(sk, addr, addrlen, &timeo, 0); 980 release_sock(sk); 981 982 return err; 983} 984 985static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags) 986{ 987 struct dn_scp *scp = DN_SK(sk); 988 989 switch(scp->state) { 990 case DN_RUN: 991 return 0; 992 case DN_CR: 993 return dn_confirm_accept(sk, timeo, sk->sk_allocation); 994 case DN_CI: 995 case DN_CC: 996 return dn_wait_run(sk, timeo); 997 case DN_O: 998 return __dn_connect(sk, addr, addrlen, timeo, flags); 999 } 1000 1001 return -EINVAL; 1002} 1003 1004 1005static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc) 1006{ 1007 unsigned char *ptr = skb->data; 1008 1009 acc->acc_userl = *ptr++; 1010 memcpy(&acc->acc_user, ptr, acc->acc_userl); 1011 ptr += acc->acc_userl; 1012 1013 acc->acc_passl = *ptr++; 1014 memcpy(&acc->acc_pass, ptr, acc->acc_passl); 1015 ptr += acc->acc_passl; 1016 1017 acc->acc_accl = *ptr++; 1018 memcpy(&acc->acc_acc, ptr, acc->acc_accl); 1019 1020 skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3); 1021 1022} 1023 1024static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt) 1025{ 1026 unsigned char *ptr = skb->data; 1027 u16 len = *ptr++; /* yes, it's 8bit on the wire */ 1028 1029 BUG_ON(len > 16); /* we've checked the contents earlier */ 1030 opt->opt_optl = cpu_to_le16(len); 1031 opt->opt_status = 0; 1032 memcpy(opt->opt_data, ptr, len); 1033 skb_pull(skb, len + 1); 1034} 1035 1036static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo) 1037{ 1038 DEFINE_WAIT(wait); 1039 struct sk_buff *skb = NULL; 1040 int err = 0; 1041 1042 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1043 for(;;) { 1044 release_sock(sk); 1045 skb = skb_dequeue(&sk->sk_receive_queue); 1046 if (skb == NULL) { 1047 *timeo = schedule_timeout(*timeo); 1048 skb = skb_dequeue(&sk->sk_receive_queue); 1049 } 1050 lock_sock(sk); 1051 if (skb != NULL) 1052 break; 1053 err = -EINVAL; 1054 if (sk->sk_state != TCP_LISTEN) 1055 break; 1056 err = sock_intr_errno(*timeo); 1057 if (signal_pending(current)) 1058 break; 1059 err = -EAGAIN; 1060 if (!*timeo) 1061 break; 1062 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1063 } 1064 finish_wait(sk->sk_sleep, &wait); 1065 1066 return skb == NULL ? ERR_PTR(err) : skb; 1067} 1068 1069static int dn_accept(struct socket *sock, struct socket *newsock, int flags) 1070{ 1071 struct sock *sk = sock->sk, *newsk; 1072 struct sk_buff *skb = NULL; 1073 struct dn_skb_cb *cb; 1074 unsigned char menuver; 1075 int err = 0; 1076 unsigned char type; 1077 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 1078 1079 lock_sock(sk); 1080 1081 if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) { 1082 release_sock(sk); 1083 return -EINVAL; 1084 } 1085 1086 skb = skb_dequeue(&sk->sk_receive_queue); 1087 if (skb == NULL) { 1088 skb = dn_wait_for_connect(sk, &timeo); 1089 if (IS_ERR(skb)) { 1090 release_sock(sk); 1091 return PTR_ERR(skb); 1092 } 1093 } 1094 1095 cb = DN_SKB_CB(skb); 1096 sk->sk_ack_backlog--; 1097 newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation); 1098 if (newsk == NULL) { 1099 release_sock(sk); 1100 kfree_skb(skb); 1101 return -ENOBUFS; 1102 } 1103 release_sock(sk); 1104 1105 dst_release(xchg(&newsk->sk_dst_cache, skb->dst)); 1106 skb->dst = NULL; 1107 1108 DN_SK(newsk)->state = DN_CR; 1109 DN_SK(newsk)->addrrem = cb->src_port; 1110 DN_SK(newsk)->services_rem = cb->services; 1111 DN_SK(newsk)->info_rem = cb->info; 1112 DN_SK(newsk)->segsize_rem = cb->segsize; 1113 DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode; 1114 1115 if (DN_SK(newsk)->segsize_rem < 230) 1116 DN_SK(newsk)->segsize_rem = 230; 1117 1118 if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE) 1119 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd; 1120 1121 newsk->sk_state = TCP_LISTEN; 1122 memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn)); 1123 1124 /* 1125 * If we are listening on a wild socket, we don't want 1126 * the newly created socket on the wrong hash queue. 1127 */ 1128 DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD; 1129 1130 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type)); 1131 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type)); 1132 *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src; 1133 *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst; 1134 1135 menuver = *skb->data; 1136 skb_pull(skb, 1); 1137 1138 if (menuver & DN_MENUVER_ACC) 1139 dn_access_copy(skb, &(DN_SK(newsk)->accessdata)); 1140 1141 if (menuver & DN_MENUVER_USR) 1142 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in)); 1143 1144 if (menuver & DN_MENUVER_PRX) 1145 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY; 1146 1147 if (menuver & DN_MENUVER_UIC) 1148 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY; 1149 1150 kfree_skb(skb); 1151 1152 memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out), 1153 sizeof(struct optdata_dn)); 1154 memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out), 1155 sizeof(struct optdata_dn)); 1156 1157 lock_sock(newsk); 1158 err = dn_hash_sock(newsk); 1159 if (err == 0) { 1160 sock_reset_flag(newsk, SOCK_ZAPPED); 1161 dn_send_conn_ack(newsk); 1162 1163 /* 1164 * Here we use sk->sk_allocation since although the conn conf is 1165 * for the newsk, the context is the old socket. 1166 */ 1167 if (DN_SK(newsk)->accept_mode == ACC_IMMED) 1168 err = dn_confirm_accept(newsk, &timeo, 1169 sk->sk_allocation); 1170 } 1171 release_sock(newsk); 1172 return err; 1173} 1174 1175 1176static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer) 1177{ 1178 struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr; 1179 struct sock *sk = sock->sk; 1180 struct dn_scp *scp = DN_SK(sk); 1181 1182 *uaddr_len = sizeof(struct sockaddr_dn); 1183 1184 lock_sock(sk); 1185 1186 if (peer) { 1187 if ((sock->state != SS_CONNECTED && 1188 sock->state != SS_CONNECTING) && 1189 scp->accept_mode == ACC_IMMED) { 1190 release_sock(sk); 1191 return -ENOTCONN; 1192 } 1193 1194 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn)); 1195 } else { 1196 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn)); 1197 } 1198 1199 release_sock(sk); 1200 1201 return 0; 1202} 1203 1204 1205static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table *wait) 1206{ 1207 struct sock *sk = sock->sk; 1208 struct dn_scp *scp = DN_SK(sk); 1209 int mask = datagram_poll(file, sock, wait); 1210 1211 if (!skb_queue_empty(&scp->other_receive_queue)) 1212 mask |= POLLRDBAND; 1213 1214 return mask; 1215} 1216 1217static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1218{ 1219 struct sock *sk = sock->sk; 1220 struct dn_scp *scp = DN_SK(sk); 1221 int err = -EOPNOTSUPP; 1222 long amount = 0; 1223 struct sk_buff *skb; 1224 int val; 1225 1226 switch(cmd) 1227 { 1228 case SIOCGIFADDR: 1229 case SIOCSIFADDR: 1230 return dn_dev_ioctl(cmd, (void __user *)arg); 1231 1232 case SIOCATMARK: 1233 lock_sock(sk); 1234 val = !skb_queue_empty(&scp->other_receive_queue); 1235 if (scp->state != DN_RUN) 1236 val = -ENOTCONN; 1237 release_sock(sk); 1238 return val; 1239 1240 case TIOCOUTQ: 1241 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); 1242 if (amount < 0) 1243 amount = 0; 1244 err = put_user(amount, (int __user *)arg); 1245 break; 1246 1247 case TIOCINQ: 1248 lock_sock(sk); 1249 if ((skb = skb_peek(&scp->other_receive_queue)) != NULL) { 1250 amount = skb->len; 1251 } else { 1252 struct sk_buff *skb = sk->sk_receive_queue.next; 1253 for(;;) { 1254 if (skb == 1255 (struct sk_buff *)&sk->sk_receive_queue) 1256 break; 1257 amount += skb->len; 1258 skb = skb->next; 1259 } 1260 } 1261 release_sock(sk); 1262 err = put_user(amount, (int __user *)arg); 1263 break; 1264 1265 default: 1266 err = -ENOIOCTLCMD; 1267 break; 1268 } 1269 1270 return err; 1271} 1272 1273static int dn_listen(struct socket *sock, int backlog) 1274{ 1275 struct sock *sk = sock->sk; 1276 int err = -EINVAL; 1277 1278 lock_sock(sk); 1279 1280 if (sock_flag(sk, SOCK_ZAPPED)) 1281 goto out; 1282 1283 if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN)) 1284 goto out; 1285 1286 sk->sk_max_ack_backlog = backlog; 1287 sk->sk_ack_backlog = 0; 1288 sk->sk_state = TCP_LISTEN; 1289 err = 0; 1290 dn_rehash_sock(sk); 1291 1292out: 1293 release_sock(sk); 1294 1295 return err; 1296} 1297 1298 1299static int dn_shutdown(struct socket *sock, int how) 1300{ 1301 struct sock *sk = sock->sk; 1302 struct dn_scp *scp = DN_SK(sk); 1303 int err = -ENOTCONN; 1304 1305 lock_sock(sk); 1306 1307 if (sock->state == SS_UNCONNECTED) 1308 goto out; 1309 1310 err = 0; 1311 if (sock->state == SS_DISCONNECTING) 1312 goto out; 1313 1314 err = -EINVAL; 1315 if (scp->state == DN_O) 1316 goto out; 1317 1318 if (how != SHUTDOWN_MASK) 1319 goto out; 1320 1321 sk->sk_shutdown = how; 1322 dn_destroy_sock(sk); 1323 err = 0; 1324 1325out: 1326 release_sock(sk); 1327 1328 return err; 1329} 1330 1331static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) 1332{ 1333 struct sock *sk = sock->sk; 1334 int err; 1335 1336 lock_sock(sk); 1337 err = __dn_setsockopt(sock, level, optname, optval, optlen, 0); 1338 release_sock(sk); 1339 1340 return err; 1341} 1342 1343static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, int optlen, int flags) 1344{ 1345 struct sock *sk = sock->sk; 1346 struct dn_scp *scp = DN_SK(sk); 1347 long timeo; 1348 union { 1349 struct optdata_dn opt; 1350 struct accessdata_dn acc; 1351 int mode; 1352 unsigned long win; 1353 int val; 1354 unsigned char services; 1355 unsigned char info; 1356 } u; 1357 int err; 1358 1359 if (optlen && !optval) 1360 return -EINVAL; 1361 1362 if (optlen > sizeof(u)) 1363 return -EINVAL; 1364 1365 if (copy_from_user(&u, optval, optlen)) 1366 return -EFAULT; 1367 1368 switch(optname) { 1369 case DSO_CONDATA: 1370 if (sock->state == SS_CONNECTED) 1371 return -EISCONN; 1372 if ((scp->state != DN_O) && (scp->state != DN_CR)) 1373 return -EINVAL; 1374 1375 if (optlen != sizeof(struct optdata_dn)) 1376 return -EINVAL; 1377 1378 if (le16_to_cpu(u.opt.opt_optl) > 16) 1379 return -EINVAL; 1380 1381 memcpy(&scp->conndata_out, &u.opt, optlen); 1382 break; 1383 1384 case DSO_DISDATA: 1385 if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED) 1386 return -ENOTCONN; 1387 1388 if (optlen != sizeof(struct optdata_dn)) 1389 return -EINVAL; 1390 1391 if (le16_to_cpu(u.opt.opt_optl) > 16) 1392 return -EINVAL; 1393 1394 memcpy(&scp->discdata_out, &u.opt, optlen); 1395 break; 1396 1397 case DSO_CONACCESS: 1398 if (sock->state == SS_CONNECTED) 1399 return -EISCONN; 1400 if (scp->state != DN_O) 1401 return -EINVAL; 1402 1403 if (optlen != sizeof(struct accessdata_dn)) 1404 return -EINVAL; 1405 1406 if ((u.acc.acc_accl > DN_MAXACCL) || 1407 (u.acc.acc_passl > DN_MAXACCL) || 1408 (u.acc.acc_userl > DN_MAXACCL)) 1409 return -EINVAL; 1410 1411 memcpy(&scp->accessdata, &u.acc, optlen); 1412 break; 1413 1414 case DSO_ACCEPTMODE: 1415 if (sock->state == SS_CONNECTED) 1416 return -EISCONN; 1417 if (scp->state != DN_O) 1418 return -EINVAL; 1419 1420 if (optlen != sizeof(int)) 1421 return -EINVAL; 1422 1423 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER)) 1424 return -EINVAL; 1425 1426 scp->accept_mode = (unsigned char)u.mode; 1427 break; 1428 1429 case DSO_CONACCEPT: 1430 1431 if (scp->state != DN_CR) 1432 return -EINVAL; 1433 timeo = sock_rcvtimeo(sk, 0); 1434 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation); 1435 return err; 1436 1437 case DSO_CONREJECT: 1438 1439 if (scp->state != DN_CR) 1440 return -EINVAL; 1441 1442 scp->state = DN_DR; 1443 sk->sk_shutdown = SHUTDOWN_MASK; 1444 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation); 1445 break; 1446 1447 default: 1448#ifdef CONFIG_NETFILTER 1449 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen); 1450#endif 1451 case DSO_LINKINFO: 1452 case DSO_STREAM: 1453 case DSO_SEQPACKET: 1454 return -ENOPROTOOPT; 1455 1456 case DSO_MAXWINDOW: 1457 if (optlen != sizeof(unsigned long)) 1458 return -EINVAL; 1459 if (u.win > NSP_MAX_WINDOW) 1460 u.win = NSP_MAX_WINDOW; 1461 if (u.win == 0) 1462 return -EINVAL; 1463 scp->max_window = u.win; 1464 if (scp->snd_window > u.win) 1465 scp->snd_window = u.win; 1466 break; 1467 1468 case DSO_NODELAY: 1469 if (optlen != sizeof(int)) 1470 return -EINVAL; 1471 if (scp->nonagle == 2) 1472 return -EINVAL; 1473 scp->nonagle = (u.val == 0) ? 0 : 1; 1474 /* if (scp->nonagle == 1) { Push pending frames } */ 1475 break; 1476 1477 case DSO_CORK: 1478 if (optlen != sizeof(int)) 1479 return -EINVAL; 1480 if (scp->nonagle == 1) 1481 return -EINVAL; 1482 scp->nonagle = (u.val == 0) ? 0 : 2; 1483 /* if (scp->nonagle == 0) { Push pending frames } */ 1484 break; 1485 1486 case DSO_SERVICES: 1487 if (optlen != sizeof(unsigned char)) 1488 return -EINVAL; 1489 if ((u.services & ~NSP_FC_MASK) != 0x01) 1490 return -EINVAL; 1491 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK) 1492 return -EINVAL; 1493 scp->services_loc = u.services; 1494 break; 1495 1496 case DSO_INFO: 1497 if (optlen != sizeof(unsigned char)) 1498 return -EINVAL; 1499 if (u.info & 0xfc) 1500 return -EINVAL; 1501 scp->info_loc = u.info; 1502 break; 1503 } 1504 1505 return 0; 1506} 1507 1508static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) 1509{ 1510 struct sock *sk = sock->sk; 1511 int err; 1512 1513 lock_sock(sk); 1514 err = __dn_getsockopt(sock, level, optname, optval, optlen, 0); 1515 release_sock(sk); 1516 1517 return err; 1518} 1519 1520static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags) 1521{ 1522 struct sock *sk = sock->sk; 1523 struct dn_scp *scp = DN_SK(sk); 1524 struct linkinfo_dn link; 1525 unsigned int r_len; 1526 void *r_data = NULL; 1527 unsigned int val; 1528 1529 if(get_user(r_len , optlen)) 1530 return -EFAULT; 1531 1532 switch(optname) { 1533 case DSO_CONDATA: 1534 if (r_len > sizeof(struct optdata_dn)) 1535 r_len = sizeof(struct optdata_dn); 1536 r_data = &scp->conndata_in; 1537 break; 1538 1539 case DSO_DISDATA: 1540 if (r_len > sizeof(struct optdata_dn)) 1541 r_len = sizeof(struct optdata_dn); 1542 r_data = &scp->discdata_in; 1543 break; 1544 1545 case DSO_CONACCESS: 1546 if (r_len > sizeof(struct accessdata_dn)) 1547 r_len = sizeof(struct accessdata_dn); 1548 r_data = &scp->accessdata; 1549 break; 1550 1551 case DSO_ACCEPTMODE: 1552 if (r_len > sizeof(unsigned char)) 1553 r_len = sizeof(unsigned char); 1554 r_data = &scp->accept_mode; 1555 break; 1556 1557 case DSO_LINKINFO: 1558 if (r_len > sizeof(struct linkinfo_dn)) 1559 r_len = sizeof(struct linkinfo_dn); 1560 1561 switch(sock->state) { 1562 case SS_CONNECTING: 1563 link.idn_linkstate = LL_CONNECTING; 1564 break; 1565 case SS_DISCONNECTING: 1566 link.idn_linkstate = LL_DISCONNECTING; 1567 break; 1568 case SS_CONNECTED: 1569 link.idn_linkstate = LL_RUNNING; 1570 break; 1571 default: 1572 link.idn_linkstate = LL_INACTIVE; 1573 } 1574 1575 link.idn_segsize = scp->segsize_rem; 1576 r_data = &link; 1577 break; 1578 1579 default: 1580#ifdef CONFIG_NETFILTER 1581 { 1582 int val, len; 1583 1584 if(get_user(len, optlen)) 1585 return -EFAULT; 1586 1587 val = nf_getsockopt(sk, PF_DECnet, optname, 1588 optval, &len); 1589 if (val >= 0) 1590 val = put_user(len, optlen); 1591 return val; 1592 } 1593#endif 1594 case DSO_STREAM: 1595 case DSO_SEQPACKET: 1596 case DSO_CONACCEPT: 1597 case DSO_CONREJECT: 1598 return -ENOPROTOOPT; 1599 1600 case DSO_MAXWINDOW: 1601 if (r_len > sizeof(unsigned long)) 1602 r_len = sizeof(unsigned long); 1603 r_data = &scp->max_window; 1604 break; 1605 1606 case DSO_NODELAY: 1607 if (r_len > sizeof(int)) 1608 r_len = sizeof(int); 1609 val = (scp->nonagle == 1); 1610 r_data = &val; 1611 break; 1612 1613 case DSO_CORK: 1614 if (r_len > sizeof(int)) 1615 r_len = sizeof(int); 1616 val = (scp->nonagle == 2); 1617 r_data = &val; 1618 break; 1619 1620 case DSO_SERVICES: 1621 if (r_len > sizeof(unsigned char)) 1622 r_len = sizeof(unsigned char); 1623 r_data = &scp->services_rem; 1624 break; 1625 1626 case DSO_INFO: 1627 if (r_len > sizeof(unsigned char)) 1628 r_len = sizeof(unsigned char); 1629 r_data = &scp->info_rem; 1630 break; 1631 } 1632 1633 if (r_data) { 1634 if (copy_to_user(optval, r_data, r_len)) 1635 return -EFAULT; 1636 if (put_user(r_len, optlen)) 1637 return -EFAULT; 1638 } 1639 1640 return 0; 1641} 1642 1643 1644static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target) 1645{ 1646 struct sk_buff *skb = q->next; 1647 int len = 0; 1648 1649 if (flags & MSG_OOB) 1650 return !skb_queue_empty(q) ? 1 : 0; 1651 1652 while(skb != (struct sk_buff *)q) { 1653 struct dn_skb_cb *cb = DN_SKB_CB(skb); 1654 len += skb->len; 1655 1656 if (cb->nsp_flags & 0x40) { 1657 /* SOCK_SEQPACKET reads to EOM */ 1658 if (sk->sk_type == SOCK_SEQPACKET) 1659 return 1; 1660 /* so does SOCK_STREAM unless WAITALL is specified */ 1661 if (!(flags & MSG_WAITALL)) 1662 return 1; 1663 } 1664 1665 /* minimum data length for read exceeded */ 1666 if (len >= target) 1667 return 1; 1668 1669 skb = skb->next; 1670 } 1671 1672 return 0; 1673} 1674 1675 1676static int dn_recvmsg(struct kiocb *iocb, struct socket *sock, 1677 struct msghdr *msg, size_t size, int flags) 1678{ 1679 struct sock *sk = sock->sk; 1680 struct dn_scp *scp = DN_SK(sk); 1681 struct sk_buff_head *queue = &sk->sk_receive_queue; 1682 size_t target = size > 1 ? 1 : 0; 1683 size_t copied = 0; 1684 int rv = 0; 1685 struct sk_buff *skb, *nskb; 1686 struct dn_skb_cb *cb = NULL; 1687 unsigned char eor = 0; 1688 long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1689 1690 lock_sock(sk); 1691 1692 if (sock_flag(sk, SOCK_ZAPPED)) { 1693 rv = -EADDRNOTAVAIL; 1694 goto out; 1695 } 1696 1697 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1698 rv = 0; 1699 goto out; 1700 } 1701 1702 rv = dn_check_state(sk, NULL, 0, &timeo, flags); 1703 if (rv) 1704 goto out; 1705 1706 if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) { 1707 rv = -EOPNOTSUPP; 1708 goto out; 1709 } 1710 1711 if (flags & MSG_OOB) 1712 queue = &scp->other_receive_queue; 1713 1714 if (flags & MSG_WAITALL) 1715 target = size; 1716 1717 1718 /* 1719 * See if there is data ready to read, sleep if there isn't 1720 */ 1721 for(;;) { 1722 DEFINE_WAIT(wait); 1723 1724 if (sk->sk_err) 1725 goto out; 1726 1727 if (!skb_queue_empty(&scp->other_receive_queue)) { 1728 if (!(flags & MSG_OOB)) { 1729 msg->msg_flags |= MSG_OOB; 1730 if (!scp->other_report) { 1731 scp->other_report = 1; 1732 goto out; 1733 } 1734 } 1735 } 1736 1737 if (scp->state != DN_RUN) 1738 goto out; 1739 1740 if (signal_pending(current)) { 1741 rv = sock_intr_errno(timeo); 1742 goto out; 1743 } 1744 1745 if (dn_data_ready(sk, queue, flags, target)) 1746 break; 1747 1748 if (flags & MSG_DONTWAIT) { 1749 rv = -EWOULDBLOCK; 1750 goto out; 1751 } 1752 1753 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1754 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1755 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target)); 1756 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1757 finish_wait(sk->sk_sleep, &wait); 1758 } 1759 1760 for(skb = queue->next; skb != (struct sk_buff *)queue; skb = nskb) { 1761 unsigned int chunk = skb->len; 1762 cb = DN_SKB_CB(skb); 1763 1764 if ((chunk + copied) > size) 1765 chunk = size - copied; 1766 1767 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) { 1768 rv = -EFAULT; 1769 break; 1770 } 1771 copied += chunk; 1772 1773 if (!(flags & MSG_PEEK)) 1774 skb_pull(skb, chunk); 1775 1776 eor = cb->nsp_flags & 0x40; 1777 nskb = skb->next; 1778 1779 if (skb->len == 0) { 1780 skb_unlink(skb, queue); 1781 kfree_skb(skb); 1782 /* 1783 * N.B. Don't refer to skb or cb after this point 1784 * in loop. 1785 */ 1786 if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) { 1787 scp->flowloc_sw = DN_SEND; 1788 dn_nsp_send_link(sk, DN_SEND, 0); 1789 } 1790 } 1791 1792 if (eor) { 1793 if (sk->sk_type == SOCK_SEQPACKET) 1794 break; 1795 if (!(flags & MSG_WAITALL)) 1796 break; 1797 } 1798 1799 if (flags & MSG_OOB) 1800 break; 1801 1802 if (copied >= target) 1803 break; 1804 } 1805 1806 rv = copied; 1807 1808 1809 if (eor && (sk->sk_type == SOCK_SEQPACKET)) 1810 msg->msg_flags |= MSG_EOR; 1811 1812out: 1813 if (rv == 0) 1814 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk); 1815 1816 if ((rv >= 0) && msg->msg_name) { 1817 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn)); 1818 msg->msg_namelen = sizeof(struct sockaddr_dn); 1819 } 1820 1821 release_sock(sk); 1822 1823 return rv; 1824} 1825 1826 1827static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags) 1828{ 1829 unsigned char fctype = scp->services_rem & NSP_FC_MASK; 1830 if (skb_queue_len(queue) >= scp->snd_window) 1831 return 1; 1832 if (fctype != NSP_FC_NONE) { 1833 if (flags & MSG_OOB) { 1834 if (scp->flowrem_oth == 0) 1835 return 1; 1836 } else { 1837 if (scp->flowrem_dat == 0) 1838 return 1; 1839 } 1840 } 1841 return 0; 1842} 1843 1844/* 1845 * The DECnet spec requires that the "routing layer" accepts packets which 1846 * are at least 230 bytes in size. This excludes any headers which the NSP 1847 * layer might add, so we always assume that we'll be using the maximal 1848 * length header on data packets. The variation in length is due to the 1849 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't 1850 * make much practical difference. 1851 */ 1852unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu) 1853{ 1854 unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER; 1855 if (dev) { 1856 struct dn_dev *dn_db = dev->dn_ptr; 1857 mtu -= LL_RESERVED_SPACE(dev); 1858 if (dn_db->use_long) 1859 mtu -= 21; 1860 else 1861 mtu -= 6; 1862 mtu -= DN_MAX_NSP_DATA_HEADER; 1863 } else { 1864 /* 1865 * 21 = long header, 16 = guess at MAC header length 1866 */ 1867 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16); 1868 } 1869 if (mtu > mss) 1870 mss = mtu; 1871 return mss; 1872} 1873 1874static inline unsigned int dn_current_mss(struct sock *sk, int flags) 1875{ 1876 struct dst_entry *dst = __sk_dst_get(sk); 1877 struct dn_scp *scp = DN_SK(sk); 1878 int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem); 1879 1880 /* Other data messages are limited to 16 bytes per packet */ 1881 if (flags & MSG_OOB) 1882 return 16; 1883 1884 /* This works out the maximum size of segment we can send out */ 1885 if (dst) { 1886 u32 mtu = dst_mtu(dst); 1887 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now); 1888 } 1889 1890 return mss_now; 1891} 1892 1893/* 1894 * N.B. We get the timeout wrong here, but then we always did get it 1895 * wrong before and this is another step along the road to correcting 1896 * it. It ought to get updated each time we pass through the routine, 1897 * but in practise it probably doesn't matter too much for now. 1898 */ 1899static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk, 1900 unsigned long datalen, int noblock, 1901 int *errcode) 1902{ 1903 struct sk_buff *skb = sock_alloc_send_skb(sk, datalen, 1904 noblock, errcode); 1905 if (skb) { 1906 skb->protocol = htons(ETH_P_DNA_RT); 1907 skb->pkt_type = PACKET_OUTGOING; 1908 } 1909 return skb; 1910} 1911 1912static int dn_sendmsg(struct kiocb *iocb, struct socket *sock, 1913 struct msghdr *msg, size_t size) 1914{ 1915 struct sock *sk = sock->sk; 1916 struct dn_scp *scp = DN_SK(sk); 1917 size_t mss; 1918 struct sk_buff_head *queue = &scp->data_xmit_queue; 1919 int flags = msg->msg_flags; 1920 int err = 0; 1921 size_t sent = 0; 1922 int addr_len = msg->msg_namelen; 1923 struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name; 1924 struct sk_buff *skb = NULL; 1925 struct dn_skb_cb *cb; 1926 size_t len; 1927 unsigned char fctype; 1928 long timeo; 1929 1930 if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT)) 1931 return -EOPNOTSUPP; 1932 1933 if (addr_len && (addr_len != sizeof(struct sockaddr_dn))) 1934 return -EINVAL; 1935 1936 lock_sock(sk); 1937 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); 1938 /* 1939 * The only difference between stream sockets and sequenced packet 1940 * sockets is that the stream sockets always behave as if MSG_EOR 1941 * has been set. 1942 */ 1943 if (sock->type == SOCK_STREAM) { 1944 if (flags & MSG_EOR) { 1945 err = -EINVAL; 1946 goto out; 1947 } 1948 flags |= MSG_EOR; 1949 } 1950 1951 1952 err = dn_check_state(sk, addr, addr_len, &timeo, flags); 1953 if (err) 1954 goto out_err; 1955 1956 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1957 err = -EPIPE; 1958 if (!(flags & MSG_NOSIGNAL)) 1959 send_sig(SIGPIPE, current, 0); 1960 goto out_err; 1961 } 1962 1963 if ((flags & MSG_TRYHARD) && sk->sk_dst_cache) 1964 dst_negative_advice(&sk->sk_dst_cache); 1965 1966 mss = scp->segsize_rem; 1967 fctype = scp->services_rem & NSP_FC_MASK; 1968 1969 mss = dn_current_mss(sk, flags); 1970 1971 if (flags & MSG_OOB) { 1972 queue = &scp->other_xmit_queue; 1973 if (size > mss) { 1974 err = -EMSGSIZE; 1975 goto out; 1976 } 1977 } 1978 1979 scp->persist_fxn = dn_nsp_xmit_timeout; 1980 1981 while(sent < size) { 1982 err = sock_error(sk); 1983 if (err) 1984 goto out; 1985 1986 if (signal_pending(current)) { 1987 err = sock_intr_errno(timeo); 1988 goto out; 1989 } 1990 1991 /* 1992 * Calculate size that we wish to send. 1993 */ 1994 len = size - sent; 1995 1996 if (len > mss) 1997 len = mss; 1998 1999 /* 2000 * Wait for queue size to go down below the window 2001 * size. 2002 */ 2003 if (dn_queue_too_long(scp, queue, flags)) { 2004 DEFINE_WAIT(wait); 2005 2006 if (flags & MSG_DONTWAIT) { 2007 err = -EWOULDBLOCK; 2008 goto out; 2009 } 2010 2011 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 2012 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 2013 sk_wait_event(sk, &timeo, 2014 !dn_queue_too_long(scp, queue, flags)); 2015 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 2016 finish_wait(sk->sk_sleep, &wait); 2017 continue; 2018 } 2019 2020 /* 2021 * Get a suitably sized skb. 2022 * 64 is a bit of a hack really, but its larger than any 2023 * link-layer headers and has served us well as a good 2024 * guess as to their real length. 2025 */ 2026 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER, 2027 flags & MSG_DONTWAIT, &err); 2028 2029 if (err) 2030 break; 2031 2032 if (!skb) 2033 continue; 2034 2035 cb = DN_SKB_CB(skb); 2036 2037 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER); 2038 2039 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { 2040 err = -EFAULT; 2041 goto out; 2042 } 2043 2044 if (flags & MSG_OOB) { 2045 cb->nsp_flags = 0x30; 2046 if (fctype != NSP_FC_NONE) 2047 scp->flowrem_oth--; 2048 } else { 2049 cb->nsp_flags = 0x00; 2050 if (scp->seg_total == 0) 2051 cb->nsp_flags |= 0x20; 2052 2053 scp->seg_total += len; 2054 2055 if (((sent + len) == size) && (flags & MSG_EOR)) { 2056 cb->nsp_flags |= 0x40; 2057 scp->seg_total = 0; 2058 if (fctype == NSP_FC_SCMC) 2059 scp->flowrem_dat--; 2060 } 2061 if (fctype == NSP_FC_SRC) 2062 scp->flowrem_dat--; 2063 } 2064 2065 sent += len; 2066 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB); 2067 skb = NULL; 2068 2069 scp->persist = dn_nsp_persist(sk); 2070 2071 } 2072out: 2073 2074 if (skb) 2075 kfree_skb(skb); 2076 2077 release_sock(sk); 2078 2079 return sent ? sent : err; 2080 2081out_err: 2082 err = sk_stream_error(sk, flags, err); 2083 release_sock(sk); 2084 return err; 2085} 2086 2087static int dn_device_event(struct notifier_block *this, unsigned long event, 2088 void *ptr) 2089{ 2090 struct net_device *dev = (struct net_device *)ptr; 2091 2092 if (!net_eq(dev_net(dev), &init_net)) 2093 return NOTIFY_DONE; 2094 2095 switch(event) { 2096 case NETDEV_UP: 2097 dn_dev_up(dev); 2098 break; 2099 case NETDEV_DOWN: 2100 dn_dev_down(dev); 2101 break; 2102 default: 2103 break; 2104 } 2105 2106 return NOTIFY_DONE; 2107} 2108 2109static struct notifier_block dn_dev_notifier = { 2110 .notifier_call = dn_device_event, 2111}; 2112 2113extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *); 2114 2115static struct packet_type dn_dix_packet_type = { 2116 .type = cpu_to_be16(ETH_P_DNA_RT), 2117 .dev = NULL, /* All devices */ 2118 .func = dn_route_rcv, 2119}; 2120 2121#ifdef CONFIG_PROC_FS 2122struct dn_iter_state { 2123 int bucket; 2124}; 2125 2126static struct sock *dn_socket_get_first(struct seq_file *seq) 2127{ 2128 struct dn_iter_state *state = seq->private; 2129 struct sock *n = NULL; 2130 2131 for(state->bucket = 0; 2132 state->bucket < DN_SK_HASH_SIZE; 2133 ++state->bucket) { 2134 n = sk_head(&dn_sk_hash[state->bucket]); 2135 if (n) 2136 break; 2137 } 2138 2139 return n; 2140} 2141 2142static struct sock *dn_socket_get_next(struct seq_file *seq, 2143 struct sock *n) 2144{ 2145 struct dn_iter_state *state = seq->private; 2146 2147 n = sk_next(n); 2148try_again: 2149 if (n) 2150 goto out; 2151 if (++state->bucket >= DN_SK_HASH_SIZE) 2152 goto out; 2153 n = sk_head(&dn_sk_hash[state->bucket]); 2154 goto try_again; 2155out: 2156 return n; 2157} 2158 2159static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos) 2160{ 2161 struct sock *sk = dn_socket_get_first(seq); 2162 2163 if (sk) { 2164 while(*pos && (sk = dn_socket_get_next(seq, sk))) 2165 --*pos; 2166 } 2167 return *pos ? NULL : sk; 2168} 2169 2170static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos) 2171{ 2172 void *rc; 2173 read_lock_bh(&dn_hash_lock); 2174 rc = socket_get_idx(seq, &pos); 2175 if (!rc) { 2176 read_unlock_bh(&dn_hash_lock); 2177 } 2178 return rc; 2179} 2180 2181static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos) 2182{ 2183 return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2184} 2185 2186static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2187{ 2188 void *rc; 2189 2190 if (v == SEQ_START_TOKEN) { 2191 rc = dn_socket_get_idx(seq, 0); 2192 goto out; 2193 } 2194 2195 rc = dn_socket_get_next(seq, v); 2196 if (rc) 2197 goto out; 2198 read_unlock_bh(&dn_hash_lock); 2199out: 2200 ++*pos; 2201 return rc; 2202} 2203 2204static void dn_socket_seq_stop(struct seq_file *seq, void *v) 2205{ 2206 if (v && v != SEQ_START_TOKEN) 2207 read_unlock_bh(&dn_hash_lock); 2208} 2209 2210#define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126) 2211 2212static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf) 2213{ 2214 int i; 2215 2216 switch (le16_to_cpu(dn->sdn_objnamel)) { 2217 case 0: 2218 sprintf(buf, "%d", dn->sdn_objnum); 2219 break; 2220 default: 2221 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) { 2222 buf[i] = dn->sdn_objname[i]; 2223 if (IS_NOT_PRINTABLE(buf[i])) 2224 buf[i] = '.'; 2225 } 2226 buf[i] = 0; 2227 } 2228} 2229 2230static char *dn_state2asc(unsigned char state) 2231{ 2232 switch(state) { 2233 case DN_O: 2234 return "OPEN"; 2235 case DN_CR: 2236 return " CR"; 2237 case DN_DR: 2238 return " DR"; 2239 case DN_DRC: 2240 return " DRC"; 2241 case DN_CC: 2242 return " CC"; 2243 case DN_CI: 2244 return " CI"; 2245 case DN_NR: 2246 return " NR"; 2247 case DN_NC: 2248 return " NC"; 2249 case DN_CD: 2250 return " CD"; 2251 case DN_RJ: 2252 return " RJ"; 2253 case DN_RUN: 2254 return " RUN"; 2255 case DN_DI: 2256 return " DI"; 2257 case DN_DIC: 2258 return " DIC"; 2259 case DN_DN: 2260 return " DN"; 2261 case DN_CL: 2262 return " CL"; 2263 case DN_CN: 2264 return " CN"; 2265 } 2266 2267 return "????"; 2268} 2269 2270static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk) 2271{ 2272 struct dn_scp *scp = DN_SK(sk); 2273 char buf1[DN_ASCBUF_LEN]; 2274 char buf2[DN_ASCBUF_LEN]; 2275 char local_object[DN_MAXOBJL+3]; 2276 char remote_object[DN_MAXOBJL+3]; 2277 2278 dn_printable_object(&scp->addr, local_object); 2279 dn_printable_object(&scp->peer, remote_object); 2280 2281 seq_printf(seq, 2282 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s " 2283 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n", 2284 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1), 2285 scp->addrloc, 2286 scp->numdat, 2287 scp->numoth, 2288 scp->ackxmt_dat, 2289 scp->ackxmt_oth, 2290 scp->flowloc_sw, 2291 local_object, 2292 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2), 2293 scp->addrrem, 2294 scp->numdat_rcv, 2295 scp->numoth_rcv, 2296 scp->ackrcv_dat, 2297 scp->ackrcv_oth, 2298 scp->flowrem_sw, 2299 remote_object, 2300 dn_state2asc(scp->state), 2301 ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER")); 2302} 2303 2304static int dn_socket_seq_show(struct seq_file *seq, void *v) 2305{ 2306 if (v == SEQ_START_TOKEN) { 2307 seq_puts(seq, "Local Remote\n"); 2308 } else { 2309 dn_socket_format_entry(seq, v); 2310 } 2311 return 0; 2312} 2313 2314static const struct seq_operations dn_socket_seq_ops = { 2315 .start = dn_socket_seq_start, 2316 .next = dn_socket_seq_next, 2317 .stop = dn_socket_seq_stop, 2318 .show = dn_socket_seq_show, 2319}; 2320 2321static int dn_socket_seq_open(struct inode *inode, struct file *file) 2322{ 2323 return seq_open_private(file, &dn_socket_seq_ops, 2324 sizeof(struct dn_iter_state)); 2325} 2326 2327static const struct file_operations dn_socket_seq_fops = { 2328 .owner = THIS_MODULE, 2329 .open = dn_socket_seq_open, 2330 .read = seq_read, 2331 .llseek = seq_lseek, 2332 .release = seq_release_private, 2333}; 2334#endif 2335 2336static struct net_proto_family dn_family_ops = { 2337 .family = AF_DECnet, 2338 .create = dn_create, 2339 .owner = THIS_MODULE, 2340}; 2341 2342static const struct proto_ops dn_proto_ops = { 2343 .family = AF_DECnet, 2344 .owner = THIS_MODULE, 2345 .release = dn_release, 2346 .bind = dn_bind, 2347 .connect = dn_connect, 2348 .socketpair = sock_no_socketpair, 2349 .accept = dn_accept, 2350 .getname = dn_getname, 2351 .poll = dn_poll, 2352 .ioctl = dn_ioctl, 2353 .listen = dn_listen, 2354 .shutdown = dn_shutdown, 2355 .setsockopt = dn_setsockopt, 2356 .getsockopt = dn_getsockopt, 2357 .sendmsg = dn_sendmsg, 2358 .recvmsg = dn_recvmsg, 2359 .mmap = sock_no_mmap, 2360 .sendpage = sock_no_sendpage, 2361}; 2362 2363void dn_register_sysctl(void); 2364void dn_unregister_sysctl(void); 2365 2366MODULE_DESCRIPTION("The Linux DECnet Network Protocol"); 2367MODULE_AUTHOR("Linux DECnet Project Team"); 2368MODULE_LICENSE("GPL"); 2369MODULE_ALIAS_NETPROTO(PF_DECnet); 2370 2371static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n"; 2372 2373static int __init decnet_init(void) 2374{ 2375 int rc; 2376 2377 printk(banner); 2378 2379 rc = proto_register(&dn_proto, 1); 2380 if (rc != 0) 2381 goto out; 2382 2383 dn_neigh_init(); 2384 dn_dev_init(); 2385 dn_route_init(); 2386 dn_fib_init(); 2387 2388 sock_register(&dn_family_ops); 2389 dev_add_pack(&dn_dix_packet_type); 2390 register_netdevice_notifier(&dn_dev_notifier); 2391 2392 proc_net_fops_create(&init_net, "decnet", S_IRUGO, &dn_socket_seq_fops); 2393 dn_register_sysctl(); 2394out: 2395 return rc; 2396 2397} 2398module_init(decnet_init); 2399 2400/* 2401 * Prevent DECnet module unloading until its fixed properly. 2402 * Requires an audit of the code to check for memory leaks and 2403 * initialisation problems etc. 2404 */ 2405#if 0 2406static void __exit decnet_exit(void) 2407{ 2408 sock_unregister(AF_DECnet); 2409 rtnl_unregister_all(PF_DECnet); 2410 dev_remove_pack(&dn_dix_packet_type); 2411 2412 dn_unregister_sysctl(); 2413 2414 unregister_netdevice_notifier(&dn_dev_notifier); 2415 2416 dn_route_cleanup(); 2417 dn_dev_cleanup(); 2418 dn_neigh_cleanup(); 2419 dn_fib_cleanup(); 2420 2421 proc_net_remove(&init_net, "decnet"); 2422 2423 proto_unregister(&dn_proto); 2424} 2425module_exit(decnet_exit); 2426#endif 2427