af_decnet.c revision 4fc268d24ceb9f4150777c1b5b2b8e6214e56b2b
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/config.h> 103#include <linux/module.h> 104#include <linux/errno.h> 105#include <linux/types.h> 106#include <linux/slab.h> 107#include <linux/socket.h> 108#include <linux/in.h> 109#include <linux/kernel.h> 110#include <linux/sched.h> 111#include <linux/timer.h> 112#include <linux/string.h> 113#include <linux/sockios.h> 114#include <linux/net.h> 115#include <linux/netdevice.h> 116#include <linux/inet.h> 117#include <linux/route.h> 118#include <linux/netfilter.h> 119#include <linux/seq_file.h> 120#include <net/sock.h> 121#include <net/tcp_states.h> 122#include <net/flow.h> 123#include <asm/system.h> 124#include <asm/ioctls.h> 125#include <linux/capability.h> 126#include <linux/mm.h> 127#include <linux/interrupt.h> 128#include <linux/proc_fs.h> 129#include <linux/stat.h> 130#include <linux/init.h> 131#include <linux/poll.h> 132#include <net/neighbour.h> 133#include <net/dst.h> 134#include <net/dn.h> 135#include <net/dn_nsp.h> 136#include <net/dn_dev.h> 137#include <net/dn_route.h> 138#include <net/dn_fib.h> 139#include <net/dn_neigh.h> 140 141struct dn_sock { 142 struct sock sk; 143 struct dn_scp scp; 144}; 145 146static void dn_keepalive(struct sock *sk); 147 148#define DN_SK_HASH_SHIFT 8 149#define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT) 150#define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1) 151 152 153static const struct proto_ops dn_proto_ops; 154static DEFINE_RWLOCK(dn_hash_lock); 155static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE]; 156static struct hlist_head dn_wild_sk; 157static atomic_t decnet_memory_allocated; 158 159static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen, int flags); 160static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags); 161 162static struct hlist_head *dn_find_list(struct sock *sk) 163{ 164 struct dn_scp *scp = DN_SK(sk); 165 166 if (scp->addr.sdn_flags & SDF_WILD) 167 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL; 168 169 return &dn_sk_hash[scp->addrloc & DN_SK_HASH_MASK]; 170} 171 172/* 173 * Valid ports are those greater than zero and not already in use. 174 */ 175static int check_port(unsigned short port) 176{ 177 struct sock *sk; 178 struct hlist_node *node; 179 180 if (port == 0) 181 return -1; 182 183 sk_for_each(sk, node, &dn_sk_hash[port & DN_SK_HASH_MASK]) { 184 struct dn_scp *scp = DN_SK(sk); 185 if (scp->addrloc == port) 186 return -1; 187 } 188 return 0; 189} 190 191static unsigned short port_alloc(struct sock *sk) 192{ 193 struct dn_scp *scp = DN_SK(sk); 194static unsigned short port = 0x2000; 195 unsigned short i_port = port; 196 197 while(check_port(++port) != 0) { 198 if (port == i_port) 199 return 0; 200 } 201 202 scp->addrloc = port; 203 204 return 1; 205} 206 207/* 208 * Since this is only ever called from user 209 * level, we don't need a write_lock() version 210 * of this. 211 */ 212static int dn_hash_sock(struct sock *sk) 213{ 214 struct dn_scp *scp = DN_SK(sk); 215 struct hlist_head *list; 216 int rv = -EUSERS; 217 218 BUG_ON(sk_hashed(sk)); 219 220 write_lock_bh(&dn_hash_lock); 221 222 if (!scp->addrloc && !port_alloc(sk)) 223 goto out; 224 225 rv = -EADDRINUSE; 226 if ((list = dn_find_list(sk)) == NULL) 227 goto out; 228 229 sk_add_node(sk, list); 230 rv = 0; 231out: 232 write_unlock_bh(&dn_hash_lock); 233 return rv; 234} 235 236static void dn_unhash_sock(struct sock *sk) 237{ 238 write_lock(&dn_hash_lock); 239 sk_del_node_init(sk); 240 write_unlock(&dn_hash_lock); 241} 242 243static void dn_unhash_sock_bh(struct sock *sk) 244{ 245 write_lock_bh(&dn_hash_lock); 246 sk_del_node_init(sk); 247 write_unlock_bh(&dn_hash_lock); 248} 249 250static struct hlist_head *listen_hash(struct sockaddr_dn *addr) 251{ 252 int i; 253 unsigned hash = addr->sdn_objnum; 254 255 if (hash == 0) { 256 hash = addr->sdn_objnamel; 257 for(i = 0; i < dn_ntohs(addr->sdn_objnamel); i++) { 258 hash ^= addr->sdn_objname[i]; 259 hash ^= (hash << 3); 260 } 261 } 262 263 return &dn_sk_hash[hash & DN_SK_HASH_MASK]; 264} 265 266/* 267 * Called to transform a socket from bound (i.e. with a local address) 268 * into a listening socket (doesn't need a local port number) and rehashes 269 * based upon the object name/number. 270 */ 271static void dn_rehash_sock(struct sock *sk) 272{ 273 struct hlist_head *list; 274 struct dn_scp *scp = DN_SK(sk); 275 276 if (scp->addr.sdn_flags & SDF_WILD) 277 return; 278 279 write_lock_bh(&dn_hash_lock); 280 sk_del_node_init(sk); 281 DN_SK(sk)->addrloc = 0; 282 list = listen_hash(&DN_SK(sk)->addr); 283 sk_add_node(sk, list); 284 write_unlock_bh(&dn_hash_lock); 285} 286 287int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type) 288{ 289 int len = 2; 290 291 *buf++ = type; 292 293 switch(type) { 294 case 0: 295 *buf++ = sdn->sdn_objnum; 296 break; 297 case 1: 298 *buf++ = 0; 299 *buf++ = dn_ntohs(sdn->sdn_objnamel); 300 memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel)); 301 len = 3 + dn_ntohs(sdn->sdn_objnamel); 302 break; 303 case 2: 304 memset(buf, 0, 5); 305 buf += 5; 306 *buf++ = dn_ntohs(sdn->sdn_objnamel); 307 memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel)); 308 len = 7 + dn_ntohs(sdn->sdn_objnamel); 309 break; 310 } 311 312 return len; 313} 314 315/* 316 * On reception of usernames, we handle types 1 and 0 for destination 317 * addresses only. Types 2 and 4 are used for source addresses, but the 318 * UIC, GIC are ignored and they are both treated the same way. Type 3 319 * is never used as I've no idea what its purpose might be or what its 320 * format is. 321 */ 322int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt) 323{ 324 unsigned char type; 325 int size = len; 326 int namel = 12; 327 328 sdn->sdn_objnum = 0; 329 sdn->sdn_objnamel = dn_htons(0); 330 memset(sdn->sdn_objname, 0, DN_MAXOBJL); 331 332 if (len < 2) 333 return -1; 334 335 len -= 2; 336 *fmt = *data++; 337 type = *data++; 338 339 switch(*fmt) { 340 case 0: 341 sdn->sdn_objnum = type; 342 return 2; 343 case 1: 344 namel = 16; 345 break; 346 case 2: 347 len -= 4; 348 data += 4; 349 break; 350 case 4: 351 len -= 8; 352 data += 8; 353 break; 354 default: 355 return -1; 356 } 357 358 len -= 1; 359 360 if (len < 0) 361 return -1; 362 363 sdn->sdn_objnamel = dn_htons(*data++); 364 len -= dn_ntohs(sdn->sdn_objnamel); 365 366 if ((len < 0) || (dn_ntohs(sdn->sdn_objnamel) > namel)) 367 return -1; 368 369 memcpy(sdn->sdn_objname, data, dn_ntohs(sdn->sdn_objnamel)); 370 371 return size - len; 372} 373 374struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr) 375{ 376 struct hlist_head *list = listen_hash(addr); 377 struct hlist_node *node; 378 struct sock *sk; 379 380 read_lock(&dn_hash_lock); 381 sk_for_each(sk, node, list) { 382 struct dn_scp *scp = DN_SK(sk); 383 if (sk->sk_state != TCP_LISTEN) 384 continue; 385 if (scp->addr.sdn_objnum) { 386 if (scp->addr.sdn_objnum != addr->sdn_objnum) 387 continue; 388 } else { 389 if (addr->sdn_objnum) 390 continue; 391 if (scp->addr.sdn_objnamel != addr->sdn_objnamel) 392 continue; 393 if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, dn_ntohs(addr->sdn_objnamel)) != 0) 394 continue; 395 } 396 sock_hold(sk); 397 read_unlock(&dn_hash_lock); 398 return sk; 399 } 400 401 sk = sk_head(&dn_wild_sk); 402 if (sk) { 403 if (sk->sk_state == TCP_LISTEN) 404 sock_hold(sk); 405 else 406 sk = NULL; 407 } 408 409 read_unlock(&dn_hash_lock); 410 return sk; 411} 412 413struct sock *dn_find_by_skb(struct sk_buff *skb) 414{ 415 struct dn_skb_cb *cb = DN_SKB_CB(skb); 416 struct sock *sk; 417 struct hlist_node *node; 418 struct dn_scp *scp; 419 420 read_lock(&dn_hash_lock); 421 sk_for_each(sk, node, &dn_sk_hash[cb->dst_port & DN_SK_HASH_MASK]) { 422 scp = DN_SK(sk); 423 if (cb->src != dn_saddr2dn(&scp->peer)) 424 continue; 425 if (cb->dst_port != scp->addrloc) 426 continue; 427 if (scp->addrrem && (cb->src_port != scp->addrrem)) 428 continue; 429 sock_hold(sk); 430 goto found; 431 } 432 sk = NULL; 433found: 434 read_unlock(&dn_hash_lock); 435 return sk; 436} 437 438 439 440static void dn_destruct(struct sock *sk) 441{ 442 struct dn_scp *scp = DN_SK(sk); 443 444 skb_queue_purge(&scp->data_xmit_queue); 445 skb_queue_purge(&scp->other_xmit_queue); 446 skb_queue_purge(&scp->other_receive_queue); 447 448 dst_release(xchg(&sk->sk_dst_cache, NULL)); 449} 450 451static int dn_memory_pressure; 452 453static void dn_enter_memory_pressure(void) 454{ 455 if (!dn_memory_pressure) { 456 dn_memory_pressure = 1; 457 } 458} 459 460static struct proto dn_proto = { 461 .name = "NSP", 462 .owner = THIS_MODULE, 463 .enter_memory_pressure = dn_enter_memory_pressure, 464 .memory_pressure = &dn_memory_pressure, 465 .memory_allocated = &decnet_memory_allocated, 466 .sysctl_mem = sysctl_decnet_mem, 467 .sysctl_wmem = sysctl_decnet_wmem, 468 .sysctl_rmem = sysctl_decnet_rmem, 469 .max_header = DN_MAX_NSP_DATA_HEADER + 64, 470 .obj_size = sizeof(struct dn_sock), 471}; 472 473static struct sock *dn_alloc_sock(struct socket *sock, gfp_t gfp) 474{ 475 struct dn_scp *scp; 476 struct sock *sk = sk_alloc(PF_DECnet, gfp, &dn_proto, 1); 477 478 if (!sk) 479 goto out; 480 481 if (sock) 482 sock->ops = &dn_proto_ops; 483 sock_init_data(sock, sk); 484 485 sk->sk_backlog_rcv = dn_nsp_backlog_rcv; 486 sk->sk_destruct = dn_destruct; 487 sk->sk_no_check = 1; 488 sk->sk_family = PF_DECnet; 489 sk->sk_protocol = 0; 490 sk->sk_allocation = gfp; 491 sk->sk_sndbuf = sysctl_decnet_wmem[1]; 492 sk->sk_rcvbuf = sysctl_decnet_rmem[1]; 493 494 /* Initialization of DECnet Session Control Port */ 495 scp = DN_SK(sk); 496 scp->state = DN_O; /* Open */ 497 scp->numdat = 1; /* Next data seg to tx */ 498 scp->numoth = 1; /* Next oth data to tx */ 499 scp->ackxmt_dat = 0; /* Last data seg ack'ed */ 500 scp->ackxmt_oth = 0; /* Last oth data ack'ed */ 501 scp->ackrcv_dat = 0; /* Highest data ack recv*/ 502 scp->ackrcv_oth = 0; /* Last oth data ack rec*/ 503 scp->flowrem_sw = DN_SEND; 504 scp->flowloc_sw = DN_SEND; 505 scp->flowrem_dat = 0; 506 scp->flowrem_oth = 1; 507 scp->flowloc_dat = 0; 508 scp->flowloc_oth = 1; 509 scp->services_rem = 0; 510 scp->services_loc = 1 | NSP_FC_NONE; 511 scp->info_rem = 0; 512 scp->info_loc = 0x03; /* NSP version 4.1 */ 513 scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */ 514 scp->nonagle = 0; 515 scp->multi_ireq = 1; 516 scp->accept_mode = ACC_IMMED; 517 scp->addr.sdn_family = AF_DECnet; 518 scp->peer.sdn_family = AF_DECnet; 519 scp->accessdata.acc_accl = 5; 520 memcpy(scp->accessdata.acc_acc, "LINUX", 5); 521 522 scp->max_window = NSP_MAX_WINDOW; 523 scp->snd_window = NSP_MIN_WINDOW; 524 scp->nsp_srtt = NSP_INITIAL_SRTT; 525 scp->nsp_rttvar = NSP_INITIAL_RTTVAR; 526 scp->nsp_rxtshift = 0; 527 528 skb_queue_head_init(&scp->data_xmit_queue); 529 skb_queue_head_init(&scp->other_xmit_queue); 530 skb_queue_head_init(&scp->other_receive_queue); 531 532 scp->persist = 0; 533 scp->persist_fxn = NULL; 534 scp->keepalive = 10 * HZ; 535 scp->keepalive_fxn = dn_keepalive; 536 537 init_timer(&scp->delack_timer); 538 scp->delack_pending = 0; 539 scp->delack_fxn = dn_nsp_delayed_ack; 540 541 dn_start_slow_timer(sk); 542out: 543 return sk; 544} 545 546/* 547 * Keepalive timer. 548 * FIXME: Should respond to SO_KEEPALIVE etc. 549 */ 550static void dn_keepalive(struct sock *sk) 551{ 552 struct dn_scp *scp = DN_SK(sk); 553 554 /* 555 * By checking the other_data transmit queue is empty 556 * we are double checking that we are not sending too 557 * many of these keepalive frames. 558 */ 559 if (skb_queue_empty(&scp->other_xmit_queue)) 560 dn_nsp_send_link(sk, DN_NOCHANGE, 0); 561} 562 563 564/* 565 * Timer for shutdown/destroyed sockets. 566 * When socket is dead & no packets have been sent for a 567 * certain amount of time, they are removed by this 568 * routine. Also takes care of sending out DI & DC 569 * frames at correct times. 570 */ 571int dn_destroy_timer(struct sock *sk) 572{ 573 struct dn_scp *scp = DN_SK(sk); 574 575 scp->persist = dn_nsp_persist(sk); 576 577 switch(scp->state) { 578 case DN_DI: 579 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC); 580 if (scp->nsp_rxtshift >= decnet_di_count) 581 scp->state = DN_CN; 582 return 0; 583 584 case DN_DR: 585 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC); 586 if (scp->nsp_rxtshift >= decnet_dr_count) 587 scp->state = DN_DRC; 588 return 0; 589 590 case DN_DN: 591 if (scp->nsp_rxtshift < decnet_dn_count) { 592 /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */ 593 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC); 594 return 0; 595 } 596 } 597 598 scp->persist = (HZ * decnet_time_wait); 599 600 if (sk->sk_socket) 601 return 0; 602 603 if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) { 604 dn_unhash_sock(sk); 605 sock_put(sk); 606 return 1; 607 } 608 609 return 0; 610} 611 612static void dn_destroy_sock(struct sock *sk) 613{ 614 struct dn_scp *scp = DN_SK(sk); 615 616 scp->nsp_rxtshift = 0; /* reset back off */ 617 618 if (sk->sk_socket) { 619 if (sk->sk_socket->state != SS_UNCONNECTED) 620 sk->sk_socket->state = SS_DISCONNECTING; 621 } 622 623 sk->sk_state = TCP_CLOSE; 624 625 switch(scp->state) { 626 case DN_DN: 627 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, 628 sk->sk_allocation); 629 scp->persist_fxn = dn_destroy_timer; 630 scp->persist = dn_nsp_persist(sk); 631 break; 632 case DN_CR: 633 scp->state = DN_DR; 634 goto disc_reject; 635 case DN_RUN: 636 scp->state = DN_DI; 637 case DN_DI: 638 case DN_DR: 639disc_reject: 640 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation); 641 case DN_NC: 642 case DN_NR: 643 case DN_RJ: 644 case DN_DIC: 645 case DN_CN: 646 case DN_DRC: 647 case DN_CI: 648 case DN_CD: 649 scp->persist_fxn = dn_destroy_timer; 650 scp->persist = dn_nsp_persist(sk); 651 break; 652 default: 653 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n"); 654 case DN_O: 655 dn_stop_slow_timer(sk); 656 657 dn_unhash_sock_bh(sk); 658 sock_put(sk); 659 660 break; 661 } 662} 663 664char *dn_addr2asc(dn_address addr, char *buf) 665{ 666 unsigned short node, area; 667 668 node = addr & 0x03ff; 669 area = addr >> 10; 670 sprintf(buf, "%hd.%hd", area, node); 671 672 return buf; 673} 674 675 676 677static int dn_create(struct socket *sock, int protocol) 678{ 679 struct sock *sk; 680 681 switch(sock->type) { 682 case SOCK_SEQPACKET: 683 if (protocol != DNPROTO_NSP) 684 return -EPROTONOSUPPORT; 685 break; 686 case SOCK_STREAM: 687 break; 688 default: 689 return -ESOCKTNOSUPPORT; 690 } 691 692 693 if ((sk = dn_alloc_sock(sock, GFP_KERNEL)) == NULL) 694 return -ENOBUFS; 695 696 sk->sk_protocol = protocol; 697 698 return 0; 699} 700 701 702static int 703dn_release(struct socket *sock) 704{ 705 struct sock *sk = sock->sk; 706 707 if (sk) { 708 sock_orphan(sk); 709 sock_hold(sk); 710 lock_sock(sk); 711 dn_destroy_sock(sk); 712 release_sock(sk); 713 sock_put(sk); 714 } 715 716 return 0; 717} 718 719static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 720{ 721 struct sock *sk = sock->sk; 722 struct dn_scp *scp = DN_SK(sk); 723 struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr; 724 struct net_device *dev; 725 int rv; 726 727 if (addr_len != sizeof(struct sockaddr_dn)) 728 return -EINVAL; 729 730 if (saddr->sdn_family != AF_DECnet) 731 return -EINVAL; 732 733 if (dn_ntohs(saddr->sdn_nodeaddrl) && (dn_ntohs(saddr->sdn_nodeaddrl) != 2)) 734 return -EINVAL; 735 736 if (dn_ntohs(saddr->sdn_objnamel) > DN_MAXOBJL) 737 return -EINVAL; 738 739 if (saddr->sdn_flags & ~SDF_WILD) 740 return -EINVAL; 741 742 if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum || 743 (saddr->sdn_flags & SDF_WILD))) 744 return -EACCES; 745 746 if (!(saddr->sdn_flags & SDF_WILD)) { 747 if (dn_ntohs(saddr->sdn_nodeaddrl)) { 748 read_lock(&dev_base_lock); 749 for(dev = dev_base; dev; dev = dev->next) { 750 if (!dev->dn_ptr) 751 continue; 752 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) 753 break; 754 } 755 read_unlock(&dev_base_lock); 756 if (dev == NULL) 757 return -EADDRNOTAVAIL; 758 } 759 } 760 761 rv = -EINVAL; 762 lock_sock(sk); 763 if (sock_flag(sk, SOCK_ZAPPED)) { 764 memcpy(&scp->addr, saddr, addr_len); 765 sock_reset_flag(sk, SOCK_ZAPPED); 766 767 rv = dn_hash_sock(sk); 768 if (rv) 769 sock_set_flag(sk, SOCK_ZAPPED); 770 } 771 release_sock(sk); 772 773 return rv; 774} 775 776 777static int dn_auto_bind(struct socket *sock) 778{ 779 struct sock *sk = sock->sk; 780 struct dn_scp *scp = DN_SK(sk); 781 int rv; 782 783 sock_reset_flag(sk, SOCK_ZAPPED); 784 785 scp->addr.sdn_flags = 0; 786 scp->addr.sdn_objnum = 0; 787 788 /* 789 * This stuff is to keep compatibility with Eduardo's 790 * patch. I hope I can dispense with it shortly... 791 */ 792 if ((scp->accessdata.acc_accl != 0) && 793 (scp->accessdata.acc_accl <= 12)) { 794 795 scp->addr.sdn_objnamel = dn_htons(scp->accessdata.acc_accl); 796 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, dn_ntohs(scp->addr.sdn_objnamel)); 797 798 scp->accessdata.acc_accl = 0; 799 memset(scp->accessdata.acc_acc, 0, 40); 800 } 801 /* End of compatibility stuff */ 802 803 scp->addr.sdn_add.a_len = dn_htons(2); 804 rv = dn_dev_bind_default((dn_address *)scp->addr.sdn_add.a_addr); 805 if (rv == 0) { 806 rv = dn_hash_sock(sk); 807 if (rv) 808 sock_set_flag(sk, SOCK_ZAPPED); 809 } 810 811 return rv; 812} 813 814static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation) 815{ 816 struct dn_scp *scp = DN_SK(sk); 817 DEFINE_WAIT(wait); 818 int err; 819 820 if (scp->state != DN_CR) 821 return -EINVAL; 822 823 scp->state = DN_CC; 824 scp->segsize_loc = dst_metric(__sk_dst_get(sk), RTAX_ADVMSS); 825 dn_send_conn_conf(sk, allocation); 826 827 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 828 for(;;) { 829 release_sock(sk); 830 if (scp->state == DN_CC) 831 *timeo = schedule_timeout(*timeo); 832 lock_sock(sk); 833 err = 0; 834 if (scp->state == DN_RUN) 835 break; 836 err = sock_error(sk); 837 if (err) 838 break; 839 err = sock_intr_errno(*timeo); 840 if (signal_pending(current)) 841 break; 842 err = -EAGAIN; 843 if (!*timeo) 844 break; 845 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 846 } 847 finish_wait(sk->sk_sleep, &wait); 848 if (err == 0) { 849 sk->sk_socket->state = SS_CONNECTED; 850 } else if (scp->state != DN_CC) { 851 sk->sk_socket->state = SS_UNCONNECTED; 852 } 853 return err; 854} 855 856static int dn_wait_run(struct sock *sk, long *timeo) 857{ 858 struct dn_scp *scp = DN_SK(sk); 859 DEFINE_WAIT(wait); 860 int err = 0; 861 862 if (scp->state == DN_RUN) 863 goto out; 864 865 if (!*timeo) 866 return -EALREADY; 867 868 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 869 for(;;) { 870 release_sock(sk); 871 if (scp->state == DN_CI || scp->state == DN_CC) 872 *timeo = schedule_timeout(*timeo); 873 lock_sock(sk); 874 err = 0; 875 if (scp->state == DN_RUN) 876 break; 877 err = sock_error(sk); 878 if (err) 879 break; 880 err = sock_intr_errno(*timeo); 881 if (signal_pending(current)) 882 break; 883 err = -ETIMEDOUT; 884 if (!*timeo) 885 break; 886 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 887 } 888 finish_wait(sk->sk_sleep, &wait); 889out: 890 if (err == 0) { 891 sk->sk_socket->state = SS_CONNECTED; 892 } else if (scp->state != DN_CI && scp->state != DN_CC) { 893 sk->sk_socket->state = SS_UNCONNECTED; 894 } 895 return err; 896} 897 898static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags) 899{ 900 struct socket *sock = sk->sk_socket; 901 struct dn_scp *scp = DN_SK(sk); 902 int err = -EISCONN; 903 struct flowi fl; 904 905 if (sock->state == SS_CONNECTED) 906 goto out; 907 908 if (sock->state == SS_CONNECTING) { 909 err = 0; 910 if (scp->state == DN_RUN) { 911 sock->state = SS_CONNECTED; 912 goto out; 913 } 914 err = -ECONNREFUSED; 915 if (scp->state != DN_CI && scp->state != DN_CC) { 916 sock->state = SS_UNCONNECTED; 917 goto out; 918 } 919 return dn_wait_run(sk, timeo); 920 } 921 922 err = -EINVAL; 923 if (scp->state != DN_O) 924 goto out; 925 926 if (addr == NULL || addrlen != sizeof(struct sockaddr_dn)) 927 goto out; 928 if (addr->sdn_family != AF_DECnet) 929 goto out; 930 if (addr->sdn_flags & SDF_WILD) 931 goto out; 932 933 if (sock_flag(sk, SOCK_ZAPPED)) { 934 err = dn_auto_bind(sk->sk_socket); 935 if (err) 936 goto out; 937 } 938 939 memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn)); 940 941 err = -EHOSTUNREACH; 942 memset(&fl, 0, sizeof(fl)); 943 fl.oif = sk->sk_bound_dev_if; 944 fl.fld_dst = dn_saddr2dn(&scp->peer); 945 fl.fld_src = dn_saddr2dn(&scp->addr); 946 dn_sk_ports_copy(&fl, scp); 947 fl.proto = DNPROTO_NSP; 948 if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, flags) < 0) 949 goto out; 950 sk->sk_route_caps = sk->sk_dst_cache->dev->features; 951 sock->state = SS_CONNECTING; 952 scp->state = DN_CI; 953 scp->segsize_loc = dst_metric(sk->sk_dst_cache, RTAX_ADVMSS); 954 955 dn_nsp_send_conninit(sk, NSP_CI); 956 err = -EINPROGRESS; 957 if (*timeo) { 958 err = dn_wait_run(sk, timeo); 959 } 960out: 961 return err; 962} 963 964static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags) 965{ 966 struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr; 967 struct sock *sk = sock->sk; 968 int err; 969 long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 970 971 lock_sock(sk); 972 err = __dn_connect(sk, addr, addrlen, &timeo, 0); 973 release_sock(sk); 974 975 return err; 976} 977 978static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags) 979{ 980 struct dn_scp *scp = DN_SK(sk); 981 982 switch(scp->state) { 983 case DN_RUN: 984 return 0; 985 case DN_CR: 986 return dn_confirm_accept(sk, timeo, sk->sk_allocation); 987 case DN_CI: 988 case DN_CC: 989 return dn_wait_run(sk, timeo); 990 case DN_O: 991 return __dn_connect(sk, addr, addrlen, timeo, flags); 992 } 993 994 return -EINVAL; 995} 996 997 998static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc) 999{ 1000 unsigned char *ptr = skb->data; 1001 1002 acc->acc_userl = *ptr++; 1003 memcpy(&acc->acc_user, ptr, acc->acc_userl); 1004 ptr += acc->acc_userl; 1005 1006 acc->acc_passl = *ptr++; 1007 memcpy(&acc->acc_pass, ptr, acc->acc_passl); 1008 ptr += acc->acc_passl; 1009 1010 acc->acc_accl = *ptr++; 1011 memcpy(&acc->acc_acc, ptr, acc->acc_accl); 1012 1013 skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3); 1014 1015} 1016 1017static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt) 1018{ 1019 unsigned char *ptr = skb->data; 1020 1021 opt->opt_optl = *ptr++; 1022 opt->opt_status = 0; 1023 memcpy(opt->opt_data, ptr, opt->opt_optl); 1024 skb_pull(skb, opt->opt_optl + 1); 1025 1026} 1027 1028static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo) 1029{ 1030 DEFINE_WAIT(wait); 1031 struct sk_buff *skb = NULL; 1032 int err = 0; 1033 1034 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1035 for(;;) { 1036 release_sock(sk); 1037 skb = skb_dequeue(&sk->sk_receive_queue); 1038 if (skb == NULL) { 1039 *timeo = schedule_timeout(*timeo); 1040 skb = skb_dequeue(&sk->sk_receive_queue); 1041 } 1042 lock_sock(sk); 1043 if (skb != NULL) 1044 break; 1045 err = -EINVAL; 1046 if (sk->sk_state != TCP_LISTEN) 1047 break; 1048 err = sock_intr_errno(*timeo); 1049 if (signal_pending(current)) 1050 break; 1051 err = -EAGAIN; 1052 if (!*timeo) 1053 break; 1054 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1055 } 1056 finish_wait(sk->sk_sleep, &wait); 1057 1058 return skb == NULL ? ERR_PTR(err) : skb; 1059} 1060 1061static int dn_accept(struct socket *sock, struct socket *newsock, int flags) 1062{ 1063 struct sock *sk = sock->sk, *newsk; 1064 struct sk_buff *skb = NULL; 1065 struct dn_skb_cb *cb; 1066 unsigned char menuver; 1067 int err = 0; 1068 unsigned char type; 1069 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 1070 1071 lock_sock(sk); 1072 1073 if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) { 1074 release_sock(sk); 1075 return -EINVAL; 1076 } 1077 1078 skb = skb_dequeue(&sk->sk_receive_queue); 1079 if (skb == NULL) { 1080 skb = dn_wait_for_connect(sk, &timeo); 1081 if (IS_ERR(skb)) { 1082 release_sock(sk); 1083 return PTR_ERR(skb); 1084 } 1085 } 1086 1087 cb = DN_SKB_CB(skb); 1088 sk->sk_ack_backlog--; 1089 newsk = dn_alloc_sock(newsock, sk->sk_allocation); 1090 if (newsk == NULL) { 1091 release_sock(sk); 1092 kfree_skb(skb); 1093 return -ENOBUFS; 1094 } 1095 release_sock(sk); 1096 1097 dst_release(xchg(&newsk->sk_dst_cache, skb->dst)); 1098 skb->dst = NULL; 1099 1100 DN_SK(newsk)->state = DN_CR; 1101 DN_SK(newsk)->addrrem = cb->src_port; 1102 DN_SK(newsk)->services_rem = cb->services; 1103 DN_SK(newsk)->info_rem = cb->info; 1104 DN_SK(newsk)->segsize_rem = cb->segsize; 1105 DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode; 1106 1107 if (DN_SK(newsk)->segsize_rem < 230) 1108 DN_SK(newsk)->segsize_rem = 230; 1109 1110 if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE) 1111 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd; 1112 1113 newsk->sk_state = TCP_LISTEN; 1114 memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn)); 1115 1116 /* 1117 * If we are listening on a wild socket, we don't want 1118 * the newly created socket on the wrong hash queue. 1119 */ 1120 DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD; 1121 1122 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type)); 1123 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type)); 1124 *(dn_address *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src; 1125 *(dn_address *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst; 1126 1127 menuver = *skb->data; 1128 skb_pull(skb, 1); 1129 1130 if (menuver & DN_MENUVER_ACC) 1131 dn_access_copy(skb, &(DN_SK(newsk)->accessdata)); 1132 1133 if (menuver & DN_MENUVER_USR) 1134 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in)); 1135 1136 if (menuver & DN_MENUVER_PRX) 1137 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY; 1138 1139 if (menuver & DN_MENUVER_UIC) 1140 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY; 1141 1142 kfree_skb(skb); 1143 1144 memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out), 1145 sizeof(struct optdata_dn)); 1146 memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out), 1147 sizeof(struct optdata_dn)); 1148 1149 lock_sock(newsk); 1150 err = dn_hash_sock(newsk); 1151 if (err == 0) { 1152 sock_reset_flag(newsk, SOCK_ZAPPED); 1153 dn_send_conn_ack(newsk); 1154 1155 /* 1156 * Here we use sk->sk_allocation since although the conn conf is 1157 * for the newsk, the context is the old socket. 1158 */ 1159 if (DN_SK(newsk)->accept_mode == ACC_IMMED) 1160 err = dn_confirm_accept(newsk, &timeo, 1161 sk->sk_allocation); 1162 } 1163 release_sock(newsk); 1164 return err; 1165} 1166 1167 1168static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer) 1169{ 1170 struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr; 1171 struct sock *sk = sock->sk; 1172 struct dn_scp *scp = DN_SK(sk); 1173 1174 *uaddr_len = sizeof(struct sockaddr_dn); 1175 1176 lock_sock(sk); 1177 1178 if (peer) { 1179 if ((sock->state != SS_CONNECTED && 1180 sock->state != SS_CONNECTING) && 1181 scp->accept_mode == ACC_IMMED) 1182 return -ENOTCONN; 1183 1184 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn)); 1185 } else { 1186 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn)); 1187 } 1188 1189 release_sock(sk); 1190 1191 return 0; 1192} 1193 1194 1195static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table *wait) 1196{ 1197 struct sock *sk = sock->sk; 1198 struct dn_scp *scp = DN_SK(sk); 1199 int mask = datagram_poll(file, sock, wait); 1200 1201 if (!skb_queue_empty(&scp->other_receive_queue)) 1202 mask |= POLLRDBAND; 1203 1204 return mask; 1205} 1206 1207static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1208{ 1209 struct sock *sk = sock->sk; 1210 struct dn_scp *scp = DN_SK(sk); 1211 int err = -EOPNOTSUPP; 1212 long amount = 0; 1213 struct sk_buff *skb; 1214 int val; 1215 1216 switch(cmd) 1217 { 1218 case SIOCGIFADDR: 1219 case SIOCSIFADDR: 1220 return dn_dev_ioctl(cmd, (void __user *)arg); 1221 1222 case SIOCATMARK: 1223 lock_sock(sk); 1224 val = !skb_queue_empty(&scp->other_receive_queue); 1225 if (scp->state != DN_RUN) 1226 val = -ENOTCONN; 1227 release_sock(sk); 1228 return val; 1229 1230 case TIOCOUTQ: 1231 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); 1232 if (amount < 0) 1233 amount = 0; 1234 err = put_user(amount, (int __user *)arg); 1235 break; 1236 1237 case TIOCINQ: 1238 lock_sock(sk); 1239 if ((skb = skb_peek(&scp->other_receive_queue)) != NULL) { 1240 amount = skb->len; 1241 } else { 1242 struct sk_buff *skb = sk->sk_receive_queue.next; 1243 for(;;) { 1244 if (skb == 1245 (struct sk_buff *)&sk->sk_receive_queue) 1246 break; 1247 amount += skb->len; 1248 skb = skb->next; 1249 } 1250 } 1251 release_sock(sk); 1252 err = put_user(amount, (int __user *)arg); 1253 break; 1254 1255 default: 1256 err = -ENOIOCTLCMD; 1257 break; 1258 } 1259 1260 return err; 1261} 1262 1263static int dn_listen(struct socket *sock, int backlog) 1264{ 1265 struct sock *sk = sock->sk; 1266 int err = -EINVAL; 1267 1268 lock_sock(sk); 1269 1270 if (sock_flag(sk, SOCK_ZAPPED)) 1271 goto out; 1272 1273 if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN)) 1274 goto out; 1275 1276 sk->sk_max_ack_backlog = backlog; 1277 sk->sk_ack_backlog = 0; 1278 sk->sk_state = TCP_LISTEN; 1279 err = 0; 1280 dn_rehash_sock(sk); 1281 1282out: 1283 release_sock(sk); 1284 1285 return err; 1286} 1287 1288 1289static int dn_shutdown(struct socket *sock, int how) 1290{ 1291 struct sock *sk = sock->sk; 1292 struct dn_scp *scp = DN_SK(sk); 1293 int err = -ENOTCONN; 1294 1295 lock_sock(sk); 1296 1297 if (sock->state == SS_UNCONNECTED) 1298 goto out; 1299 1300 err = 0; 1301 if (sock->state == SS_DISCONNECTING) 1302 goto out; 1303 1304 err = -EINVAL; 1305 if (scp->state == DN_O) 1306 goto out; 1307 1308 if (how != SHUTDOWN_MASK) 1309 goto out; 1310 1311 sk->sk_shutdown = how; 1312 dn_destroy_sock(sk); 1313 err = 0; 1314 1315out: 1316 release_sock(sk); 1317 1318 return err; 1319} 1320 1321static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) 1322{ 1323 struct sock *sk = sock->sk; 1324 int err; 1325 1326 lock_sock(sk); 1327 err = __dn_setsockopt(sock, level, optname, optval, optlen, 0); 1328 release_sock(sk); 1329 1330 return err; 1331} 1332 1333static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, int optlen, int flags) 1334{ 1335 struct sock *sk = sock->sk; 1336 struct dn_scp *scp = DN_SK(sk); 1337 long timeo; 1338 union { 1339 struct optdata_dn opt; 1340 struct accessdata_dn acc; 1341 int mode; 1342 unsigned long win; 1343 int val; 1344 unsigned char services; 1345 unsigned char info; 1346 } u; 1347 int err; 1348 1349 if (optlen && !optval) 1350 return -EINVAL; 1351 1352 if (optlen > sizeof(u)) 1353 return -EINVAL; 1354 1355 if (copy_from_user(&u, optval, optlen)) 1356 return -EFAULT; 1357 1358 switch(optname) { 1359 case DSO_CONDATA: 1360 if (sock->state == SS_CONNECTED) 1361 return -EISCONN; 1362 if ((scp->state != DN_O) && (scp->state != DN_CR)) 1363 return -EINVAL; 1364 1365 if (optlen != sizeof(struct optdata_dn)) 1366 return -EINVAL; 1367 1368 if (u.opt.opt_optl > 16) 1369 return -EINVAL; 1370 1371 memcpy(&scp->conndata_out, &u.opt, optlen); 1372 break; 1373 1374 case DSO_DISDATA: 1375 if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED) 1376 return -ENOTCONN; 1377 1378 if (optlen != sizeof(struct optdata_dn)) 1379 return -EINVAL; 1380 1381 if (u.opt.opt_optl > 16) 1382 return -EINVAL; 1383 1384 memcpy(&scp->discdata_out, &u.opt, optlen); 1385 break; 1386 1387 case DSO_CONACCESS: 1388 if (sock->state == SS_CONNECTED) 1389 return -EISCONN; 1390 if (scp->state != DN_O) 1391 return -EINVAL; 1392 1393 if (optlen != sizeof(struct accessdata_dn)) 1394 return -EINVAL; 1395 1396 if ((u.acc.acc_accl > DN_MAXACCL) || 1397 (u.acc.acc_passl > DN_MAXACCL) || 1398 (u.acc.acc_userl > DN_MAXACCL)) 1399 return -EINVAL; 1400 1401 memcpy(&scp->accessdata, &u.acc, optlen); 1402 break; 1403 1404 case DSO_ACCEPTMODE: 1405 if (sock->state == SS_CONNECTED) 1406 return -EISCONN; 1407 if (scp->state != DN_O) 1408 return -EINVAL; 1409 1410 if (optlen != sizeof(int)) 1411 return -EINVAL; 1412 1413 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER)) 1414 return -EINVAL; 1415 1416 scp->accept_mode = (unsigned char)u.mode; 1417 break; 1418 1419 case DSO_CONACCEPT: 1420 1421 if (scp->state != DN_CR) 1422 return -EINVAL; 1423 timeo = sock_rcvtimeo(sk, 0); 1424 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation); 1425 return err; 1426 1427 case DSO_CONREJECT: 1428 1429 if (scp->state != DN_CR) 1430 return -EINVAL; 1431 1432 scp->state = DN_DR; 1433 sk->sk_shutdown = SHUTDOWN_MASK; 1434 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation); 1435 break; 1436 1437 default: 1438#ifdef CONFIG_NETFILTER 1439 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen); 1440#endif 1441 case DSO_LINKINFO: 1442 case DSO_STREAM: 1443 case DSO_SEQPACKET: 1444 return -ENOPROTOOPT; 1445 1446 case DSO_MAXWINDOW: 1447 if (optlen != sizeof(unsigned long)) 1448 return -EINVAL; 1449 if (u.win > NSP_MAX_WINDOW) 1450 u.win = NSP_MAX_WINDOW; 1451 if (u.win == 0) 1452 return -EINVAL; 1453 scp->max_window = u.win; 1454 if (scp->snd_window > u.win) 1455 scp->snd_window = u.win; 1456 break; 1457 1458 case DSO_NODELAY: 1459 if (optlen != sizeof(int)) 1460 return -EINVAL; 1461 if (scp->nonagle == 2) 1462 return -EINVAL; 1463 scp->nonagle = (u.val == 0) ? 0 : 1; 1464 /* if (scp->nonagle == 1) { Push pending frames } */ 1465 break; 1466 1467 case DSO_CORK: 1468 if (optlen != sizeof(int)) 1469 return -EINVAL; 1470 if (scp->nonagle == 1) 1471 return -EINVAL; 1472 scp->nonagle = (u.val == 0) ? 0 : 2; 1473 /* if (scp->nonagle == 0) { Push pending frames } */ 1474 break; 1475 1476 case DSO_SERVICES: 1477 if (optlen != sizeof(unsigned char)) 1478 return -EINVAL; 1479 if ((u.services & ~NSP_FC_MASK) != 0x01) 1480 return -EINVAL; 1481 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK) 1482 return -EINVAL; 1483 scp->services_loc = u.services; 1484 break; 1485 1486 case DSO_INFO: 1487 if (optlen != sizeof(unsigned char)) 1488 return -EINVAL; 1489 if (u.info & 0xfc) 1490 return -EINVAL; 1491 scp->info_loc = u.info; 1492 break; 1493 } 1494 1495 return 0; 1496} 1497 1498static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) 1499{ 1500 struct sock *sk = sock->sk; 1501 int err; 1502 1503 lock_sock(sk); 1504 err = __dn_getsockopt(sock, level, optname, optval, optlen, 0); 1505 release_sock(sk); 1506 1507 return err; 1508} 1509 1510static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags) 1511{ 1512 struct sock *sk = sock->sk; 1513 struct dn_scp *scp = DN_SK(sk); 1514 struct linkinfo_dn link; 1515 unsigned int r_len; 1516 void *r_data = NULL; 1517 unsigned int val; 1518 1519 if(get_user(r_len , optlen)) 1520 return -EFAULT; 1521 1522 switch(optname) { 1523 case DSO_CONDATA: 1524 if (r_len > sizeof(struct optdata_dn)) 1525 r_len = sizeof(struct optdata_dn); 1526 r_data = &scp->conndata_in; 1527 break; 1528 1529 case DSO_DISDATA: 1530 if (r_len > sizeof(struct optdata_dn)) 1531 r_len = sizeof(struct optdata_dn); 1532 r_data = &scp->discdata_in; 1533 break; 1534 1535 case DSO_CONACCESS: 1536 if (r_len > sizeof(struct accessdata_dn)) 1537 r_len = sizeof(struct accessdata_dn); 1538 r_data = &scp->accessdata; 1539 break; 1540 1541 case DSO_ACCEPTMODE: 1542 if (r_len > sizeof(unsigned char)) 1543 r_len = sizeof(unsigned char); 1544 r_data = &scp->accept_mode; 1545 break; 1546 1547 case DSO_LINKINFO: 1548 if (r_len > sizeof(struct linkinfo_dn)) 1549 r_len = sizeof(struct linkinfo_dn); 1550 1551 switch(sock->state) { 1552 case SS_CONNECTING: 1553 link.idn_linkstate = LL_CONNECTING; 1554 break; 1555 case SS_DISCONNECTING: 1556 link.idn_linkstate = LL_DISCONNECTING; 1557 break; 1558 case SS_CONNECTED: 1559 link.idn_linkstate = LL_RUNNING; 1560 break; 1561 default: 1562 link.idn_linkstate = LL_INACTIVE; 1563 } 1564 1565 link.idn_segsize = scp->segsize_rem; 1566 r_data = &link; 1567 break; 1568 1569 default: 1570#ifdef CONFIG_NETFILTER 1571 { 1572 int val, len; 1573 1574 if(get_user(len, optlen)) 1575 return -EFAULT; 1576 1577 val = nf_getsockopt(sk, PF_DECnet, optname, 1578 optval, &len); 1579 if (val >= 0) 1580 val = put_user(len, optlen); 1581 return val; 1582 } 1583#endif 1584 case DSO_STREAM: 1585 case DSO_SEQPACKET: 1586 case DSO_CONACCEPT: 1587 case DSO_CONREJECT: 1588 return -ENOPROTOOPT; 1589 1590 case DSO_MAXWINDOW: 1591 if (r_len > sizeof(unsigned long)) 1592 r_len = sizeof(unsigned long); 1593 r_data = &scp->max_window; 1594 break; 1595 1596 case DSO_NODELAY: 1597 if (r_len > sizeof(int)) 1598 r_len = sizeof(int); 1599 val = (scp->nonagle == 1); 1600 r_data = &val; 1601 break; 1602 1603 case DSO_CORK: 1604 if (r_len > sizeof(int)) 1605 r_len = sizeof(int); 1606 val = (scp->nonagle == 2); 1607 r_data = &val; 1608 break; 1609 1610 case DSO_SERVICES: 1611 if (r_len > sizeof(unsigned char)) 1612 r_len = sizeof(unsigned char); 1613 r_data = &scp->services_rem; 1614 break; 1615 1616 case DSO_INFO: 1617 if (r_len > sizeof(unsigned char)) 1618 r_len = sizeof(unsigned char); 1619 r_data = &scp->info_rem; 1620 break; 1621 } 1622 1623 if (r_data) { 1624 if (copy_to_user(optval, r_data, r_len)) 1625 return -EFAULT; 1626 if (put_user(r_len, optlen)) 1627 return -EFAULT; 1628 } 1629 1630 return 0; 1631} 1632 1633 1634static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target) 1635{ 1636 struct sk_buff *skb = q->next; 1637 int len = 0; 1638 1639 if (flags & MSG_OOB) 1640 return !skb_queue_empty(q) ? 1 : 0; 1641 1642 while(skb != (struct sk_buff *)q) { 1643 struct dn_skb_cb *cb = DN_SKB_CB(skb); 1644 len += skb->len; 1645 1646 if (cb->nsp_flags & 0x40) { 1647 /* SOCK_SEQPACKET reads to EOM */ 1648 if (sk->sk_type == SOCK_SEQPACKET) 1649 return 1; 1650 /* so does SOCK_STREAM unless WAITALL is specified */ 1651 if (!(flags & MSG_WAITALL)) 1652 return 1; 1653 } 1654 1655 /* minimum data length for read exceeded */ 1656 if (len >= target) 1657 return 1; 1658 1659 skb = skb->next; 1660 } 1661 1662 return 0; 1663} 1664 1665 1666static int dn_recvmsg(struct kiocb *iocb, struct socket *sock, 1667 struct msghdr *msg, size_t size, int flags) 1668{ 1669 struct sock *sk = sock->sk; 1670 struct dn_scp *scp = DN_SK(sk); 1671 struct sk_buff_head *queue = &sk->sk_receive_queue; 1672 size_t target = size > 1 ? 1 : 0; 1673 size_t copied = 0; 1674 int rv = 0; 1675 struct sk_buff *skb, *nskb; 1676 struct dn_skb_cb *cb = NULL; 1677 unsigned char eor = 0; 1678 long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1679 1680 lock_sock(sk); 1681 1682 if (sock_flag(sk, SOCK_ZAPPED)) { 1683 rv = -EADDRNOTAVAIL; 1684 goto out; 1685 } 1686 1687 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1688 rv = 0; 1689 goto out; 1690 } 1691 1692 rv = dn_check_state(sk, NULL, 0, &timeo, flags); 1693 if (rv) 1694 goto out; 1695 1696 if (flags & ~(MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) { 1697 rv = -EOPNOTSUPP; 1698 goto out; 1699 } 1700 1701 if (flags & MSG_OOB) 1702 queue = &scp->other_receive_queue; 1703 1704 if (flags & MSG_WAITALL) 1705 target = size; 1706 1707 1708 /* 1709 * See if there is data ready to read, sleep if there isn't 1710 */ 1711 for(;;) { 1712 if (sk->sk_err) 1713 goto out; 1714 1715 if (!skb_queue_empty(&scp->other_receive_queue)) { 1716 if (!(flags & MSG_OOB)) { 1717 msg->msg_flags |= MSG_OOB; 1718 if (!scp->other_report) { 1719 scp->other_report = 1; 1720 goto out; 1721 } 1722 } 1723 } 1724 1725 if (scp->state != DN_RUN) 1726 goto out; 1727 1728 if (signal_pending(current)) { 1729 rv = sock_intr_errno(timeo); 1730 goto out; 1731 } 1732 1733 if (dn_data_ready(sk, queue, flags, target)) 1734 break; 1735 1736 if (flags & MSG_DONTWAIT) { 1737 rv = -EWOULDBLOCK; 1738 goto out; 1739 } 1740 1741 set_bit(SOCK_ASYNC_WAITDATA, &sock->flags); 1742 SOCK_SLEEP_PRE(sk) 1743 1744 if (!dn_data_ready(sk, queue, flags, target)) 1745 schedule(); 1746 1747 SOCK_SLEEP_POST(sk) 1748 clear_bit(SOCK_ASYNC_WAITDATA, &sock->flags); 1749 } 1750 1751 for(skb = queue->next; skb != (struct sk_buff *)queue; skb = nskb) { 1752 unsigned int chunk = skb->len; 1753 cb = DN_SKB_CB(skb); 1754 1755 if ((chunk + copied) > size) 1756 chunk = size - copied; 1757 1758 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) { 1759 rv = -EFAULT; 1760 break; 1761 } 1762 copied += chunk; 1763 1764 if (!(flags & MSG_PEEK)) 1765 skb_pull(skb, chunk); 1766 1767 eor = cb->nsp_flags & 0x40; 1768 nskb = skb->next; 1769 1770 if (skb->len == 0) { 1771 skb_unlink(skb, queue); 1772 kfree_skb(skb); 1773 /* 1774 * N.B. Don't refer to skb or cb after this point 1775 * in loop. 1776 */ 1777 if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) { 1778 scp->flowloc_sw = DN_SEND; 1779 dn_nsp_send_link(sk, DN_SEND, 0); 1780 } 1781 } 1782 1783 if (eor) { 1784 if (sk->sk_type == SOCK_SEQPACKET) 1785 break; 1786 if (!(flags & MSG_WAITALL)) 1787 break; 1788 } 1789 1790 if (flags & MSG_OOB) 1791 break; 1792 1793 if (copied >= target) 1794 break; 1795 } 1796 1797 rv = copied; 1798 1799 1800 if (eor && (sk->sk_type == SOCK_SEQPACKET)) 1801 msg->msg_flags |= MSG_EOR; 1802 1803out: 1804 if (rv == 0) 1805 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk); 1806 1807 if ((rv >= 0) && msg->msg_name) { 1808 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn)); 1809 msg->msg_namelen = sizeof(struct sockaddr_dn); 1810 } 1811 1812 release_sock(sk); 1813 1814 return rv; 1815} 1816 1817 1818static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags) 1819{ 1820 unsigned char fctype = scp->services_rem & NSP_FC_MASK; 1821 if (skb_queue_len(queue) >= scp->snd_window) 1822 return 1; 1823 if (fctype != NSP_FC_NONE) { 1824 if (flags & MSG_OOB) { 1825 if (scp->flowrem_oth == 0) 1826 return 1; 1827 } else { 1828 if (scp->flowrem_dat == 0) 1829 return 1; 1830 } 1831 } 1832 return 0; 1833} 1834 1835/* 1836 * The DECnet spec requires the the "routing layer" accepts packets which 1837 * are at least 230 bytes in size. This excludes any headers which the NSP 1838 * layer might add, so we always assume that we'll be using the maximal 1839 * length header on data packets. The variation in length is due to the 1840 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't 1841 * make much practical difference. 1842 */ 1843unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu) 1844{ 1845 unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER; 1846 if (dev) { 1847 struct dn_dev *dn_db = dev->dn_ptr; 1848 mtu -= LL_RESERVED_SPACE(dev); 1849 if (dn_db->use_long) 1850 mtu -= 21; 1851 else 1852 mtu -= 6; 1853 mtu -= DN_MAX_NSP_DATA_HEADER; 1854 } else { 1855 /* 1856 * 21 = long header, 16 = guess at MAC header length 1857 */ 1858 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16); 1859 } 1860 if (mtu > mss) 1861 mss = mtu; 1862 return mss; 1863} 1864 1865static inline unsigned int dn_current_mss(struct sock *sk, int flags) 1866{ 1867 struct dst_entry *dst = __sk_dst_get(sk); 1868 struct dn_scp *scp = DN_SK(sk); 1869 int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem); 1870 1871 /* Other data messages are limited to 16 bytes per packet */ 1872 if (flags & MSG_OOB) 1873 return 16; 1874 1875 /* This works out the maximum size of segment we can send out */ 1876 if (dst) { 1877 u32 mtu = dst_mtu(dst); 1878 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now); 1879 } 1880 1881 return mss_now; 1882} 1883 1884/* 1885 * N.B. We get the timeout wrong here, but then we always did get it 1886 * wrong before and this is another step along the road to correcting 1887 * it. It ought to get updated each time we pass through the routine, 1888 * but in practise it probably doesn't matter too much for now. 1889 */ 1890static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk, 1891 unsigned long datalen, int noblock, 1892 int *errcode) 1893{ 1894 struct sk_buff *skb = sock_alloc_send_skb(sk, datalen, 1895 noblock, errcode); 1896 if (skb) { 1897 skb->protocol = __constant_htons(ETH_P_DNA_RT); 1898 skb->pkt_type = PACKET_OUTGOING; 1899 } 1900 return skb; 1901} 1902 1903static int dn_sendmsg(struct kiocb *iocb, struct socket *sock, 1904 struct msghdr *msg, size_t size) 1905{ 1906 struct sock *sk = sock->sk; 1907 struct dn_scp *scp = DN_SK(sk); 1908 size_t mss; 1909 struct sk_buff_head *queue = &scp->data_xmit_queue; 1910 int flags = msg->msg_flags; 1911 int err = 0; 1912 size_t sent = 0; 1913 int addr_len = msg->msg_namelen; 1914 struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name; 1915 struct sk_buff *skb = NULL; 1916 struct dn_skb_cb *cb; 1917 size_t len; 1918 unsigned char fctype; 1919 long timeo; 1920 1921 if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT)) 1922 return -EOPNOTSUPP; 1923 1924 if (addr_len && (addr_len != sizeof(struct sockaddr_dn))) 1925 return -EINVAL; 1926 1927 lock_sock(sk); 1928 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); 1929 /* 1930 * The only difference between stream sockets and sequenced packet 1931 * sockets is that the stream sockets always behave as if MSG_EOR 1932 * has been set. 1933 */ 1934 if (sock->type == SOCK_STREAM) { 1935 if (flags & MSG_EOR) { 1936 err = -EINVAL; 1937 goto out; 1938 } 1939 flags |= MSG_EOR; 1940 } 1941 1942 1943 err = dn_check_state(sk, addr, addr_len, &timeo, flags); 1944 if (err) 1945 goto out_err; 1946 1947 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1948 err = -EPIPE; 1949 if (!(flags & MSG_NOSIGNAL)) 1950 send_sig(SIGPIPE, current, 0); 1951 goto out_err; 1952 } 1953 1954 if ((flags & MSG_TRYHARD) && sk->sk_dst_cache) 1955 dst_negative_advice(&sk->sk_dst_cache); 1956 1957 mss = scp->segsize_rem; 1958 fctype = scp->services_rem & NSP_FC_MASK; 1959 1960 mss = dn_current_mss(sk, flags); 1961 1962 if (flags & MSG_OOB) { 1963 queue = &scp->other_xmit_queue; 1964 if (size > mss) { 1965 err = -EMSGSIZE; 1966 goto out; 1967 } 1968 } 1969 1970 scp->persist_fxn = dn_nsp_xmit_timeout; 1971 1972 while(sent < size) { 1973 err = sock_error(sk); 1974 if (err) 1975 goto out; 1976 1977 if (signal_pending(current)) { 1978 err = sock_intr_errno(timeo); 1979 goto out; 1980 } 1981 1982 /* 1983 * Calculate size that we wish to send. 1984 */ 1985 len = size - sent; 1986 1987 if (len > mss) 1988 len = mss; 1989 1990 /* 1991 * Wait for queue size to go down below the window 1992 * size. 1993 */ 1994 if (dn_queue_too_long(scp, queue, flags)) { 1995 if (flags & MSG_DONTWAIT) { 1996 err = -EWOULDBLOCK; 1997 goto out; 1998 } 1999 2000 SOCK_SLEEP_PRE(sk) 2001 2002 if (dn_queue_too_long(scp, queue, flags)) 2003 schedule(); 2004 2005 SOCK_SLEEP_POST(sk) 2006 2007 continue; 2008 } 2009 2010 /* 2011 * Get a suitably sized skb. 2012 * 64 is a bit of a hack really, but its larger than any 2013 * link-layer headers and has served us well as a good 2014 * guess as to their real length. 2015 */ 2016 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER, 2017 flags & MSG_DONTWAIT, &err); 2018 2019 if (err) 2020 break; 2021 2022 if (!skb) 2023 continue; 2024 2025 cb = DN_SKB_CB(skb); 2026 2027 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER); 2028 2029 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { 2030 err = -EFAULT; 2031 goto out; 2032 } 2033 2034 if (flags & MSG_OOB) { 2035 cb->nsp_flags = 0x30; 2036 if (fctype != NSP_FC_NONE) 2037 scp->flowrem_oth--; 2038 } else { 2039 cb->nsp_flags = 0x00; 2040 if (scp->seg_total == 0) 2041 cb->nsp_flags |= 0x20; 2042 2043 scp->seg_total += len; 2044 2045 if (((sent + len) == size) && (flags & MSG_EOR)) { 2046 cb->nsp_flags |= 0x40; 2047 scp->seg_total = 0; 2048 if (fctype == NSP_FC_SCMC) 2049 scp->flowrem_dat--; 2050 } 2051 if (fctype == NSP_FC_SRC) 2052 scp->flowrem_dat--; 2053 } 2054 2055 sent += len; 2056 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB); 2057 skb = NULL; 2058 2059 scp->persist = dn_nsp_persist(sk); 2060 2061 } 2062out: 2063 2064 if (skb) 2065 kfree_skb(skb); 2066 2067 release_sock(sk); 2068 2069 return sent ? sent : err; 2070 2071out_err: 2072 err = sk_stream_error(sk, flags, err); 2073 release_sock(sk); 2074 return err; 2075} 2076 2077static int dn_device_event(struct notifier_block *this, unsigned long event, 2078 void *ptr) 2079{ 2080 struct net_device *dev = (struct net_device *)ptr; 2081 2082 switch(event) { 2083 case NETDEV_UP: 2084 dn_dev_up(dev); 2085 break; 2086 case NETDEV_DOWN: 2087 dn_dev_down(dev); 2088 break; 2089 default: 2090 break; 2091 } 2092 2093 return NOTIFY_DONE; 2094} 2095 2096static struct notifier_block dn_dev_notifier = { 2097 .notifier_call = dn_device_event, 2098}; 2099 2100extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *); 2101 2102static struct packet_type dn_dix_packet_type = { 2103 .type = __constant_htons(ETH_P_DNA_RT), 2104 .dev = NULL, /* All devices */ 2105 .func = dn_route_rcv, 2106}; 2107 2108#ifdef CONFIG_PROC_FS 2109struct dn_iter_state { 2110 int bucket; 2111}; 2112 2113static struct sock *dn_socket_get_first(struct seq_file *seq) 2114{ 2115 struct dn_iter_state *state = seq->private; 2116 struct sock *n = NULL; 2117 2118 for(state->bucket = 0; 2119 state->bucket < DN_SK_HASH_SIZE; 2120 ++state->bucket) { 2121 n = sk_head(&dn_sk_hash[state->bucket]); 2122 if (n) 2123 break; 2124 } 2125 2126 return n; 2127} 2128 2129static struct sock *dn_socket_get_next(struct seq_file *seq, 2130 struct sock *n) 2131{ 2132 struct dn_iter_state *state = seq->private; 2133 2134 n = sk_next(n); 2135try_again: 2136 if (n) 2137 goto out; 2138 if (++state->bucket >= DN_SK_HASH_SIZE) 2139 goto out; 2140 n = sk_head(&dn_sk_hash[state->bucket]); 2141 goto try_again; 2142out: 2143 return n; 2144} 2145 2146static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos) 2147{ 2148 struct sock *sk = dn_socket_get_first(seq); 2149 2150 if (sk) { 2151 while(*pos && (sk = dn_socket_get_next(seq, sk))) 2152 --*pos; 2153 } 2154 return *pos ? NULL : sk; 2155} 2156 2157static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos) 2158{ 2159 void *rc; 2160 read_lock_bh(&dn_hash_lock); 2161 rc = socket_get_idx(seq, &pos); 2162 if (!rc) { 2163 read_unlock_bh(&dn_hash_lock); 2164 } 2165 return rc; 2166} 2167 2168static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos) 2169{ 2170 return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2171} 2172 2173static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2174{ 2175 void *rc; 2176 2177 if (v == SEQ_START_TOKEN) { 2178 rc = dn_socket_get_idx(seq, 0); 2179 goto out; 2180 } 2181 2182 rc = dn_socket_get_next(seq, v); 2183 if (rc) 2184 goto out; 2185 read_unlock_bh(&dn_hash_lock); 2186out: 2187 ++*pos; 2188 return rc; 2189} 2190 2191static void dn_socket_seq_stop(struct seq_file *seq, void *v) 2192{ 2193 if (v && v != SEQ_START_TOKEN) 2194 read_unlock_bh(&dn_hash_lock); 2195} 2196 2197#define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126) 2198 2199static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf) 2200{ 2201 int i; 2202 2203 switch (dn_ntohs(dn->sdn_objnamel)) { 2204 case 0: 2205 sprintf(buf, "%d", dn->sdn_objnum); 2206 break; 2207 default: 2208 for (i = 0; i < dn_ntohs(dn->sdn_objnamel); i++) { 2209 buf[i] = dn->sdn_objname[i]; 2210 if (IS_NOT_PRINTABLE(buf[i])) 2211 buf[i] = '.'; 2212 } 2213 buf[i] = 0; 2214 } 2215} 2216 2217static char *dn_state2asc(unsigned char state) 2218{ 2219 switch(state) { 2220 case DN_O: 2221 return "OPEN"; 2222 case DN_CR: 2223 return " CR"; 2224 case DN_DR: 2225 return " DR"; 2226 case DN_DRC: 2227 return " DRC"; 2228 case DN_CC: 2229 return " CC"; 2230 case DN_CI: 2231 return " CI"; 2232 case DN_NR: 2233 return " NR"; 2234 case DN_NC: 2235 return " NC"; 2236 case DN_CD: 2237 return " CD"; 2238 case DN_RJ: 2239 return " RJ"; 2240 case DN_RUN: 2241 return " RUN"; 2242 case DN_DI: 2243 return " DI"; 2244 case DN_DIC: 2245 return " DIC"; 2246 case DN_DN: 2247 return " DN"; 2248 case DN_CL: 2249 return " CL"; 2250 case DN_CN: 2251 return " CN"; 2252 } 2253 2254 return "????"; 2255} 2256 2257static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk) 2258{ 2259 struct dn_scp *scp = DN_SK(sk); 2260 char buf1[DN_ASCBUF_LEN]; 2261 char buf2[DN_ASCBUF_LEN]; 2262 char local_object[DN_MAXOBJL+3]; 2263 char remote_object[DN_MAXOBJL+3]; 2264 2265 dn_printable_object(&scp->addr, local_object); 2266 dn_printable_object(&scp->peer, remote_object); 2267 2268 seq_printf(seq, 2269 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s " 2270 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n", 2271 dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->addr)), buf1), 2272 scp->addrloc, 2273 scp->numdat, 2274 scp->numoth, 2275 scp->ackxmt_dat, 2276 scp->ackxmt_oth, 2277 scp->flowloc_sw, 2278 local_object, 2279 dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->peer)), buf2), 2280 scp->addrrem, 2281 scp->numdat_rcv, 2282 scp->numoth_rcv, 2283 scp->ackrcv_dat, 2284 scp->ackrcv_oth, 2285 scp->flowrem_sw, 2286 remote_object, 2287 dn_state2asc(scp->state), 2288 ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER")); 2289} 2290 2291static int dn_socket_seq_show(struct seq_file *seq, void *v) 2292{ 2293 if (v == SEQ_START_TOKEN) { 2294 seq_puts(seq, "Local Remote\n"); 2295 } else { 2296 dn_socket_format_entry(seq, v); 2297 } 2298 return 0; 2299} 2300 2301static struct seq_operations dn_socket_seq_ops = { 2302 .start = dn_socket_seq_start, 2303 .next = dn_socket_seq_next, 2304 .stop = dn_socket_seq_stop, 2305 .show = dn_socket_seq_show, 2306}; 2307 2308static int dn_socket_seq_open(struct inode *inode, struct file *file) 2309{ 2310 struct seq_file *seq; 2311 int rc = -ENOMEM; 2312 struct dn_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 2313 2314 if (!s) 2315 goto out; 2316 2317 rc = seq_open(file, &dn_socket_seq_ops); 2318 if (rc) 2319 goto out_kfree; 2320 2321 seq = file->private_data; 2322 seq->private = s; 2323 memset(s, 0, sizeof(*s)); 2324out: 2325 return rc; 2326out_kfree: 2327 kfree(s); 2328 goto out; 2329} 2330 2331static struct file_operations dn_socket_seq_fops = { 2332 .owner = THIS_MODULE, 2333 .open = dn_socket_seq_open, 2334 .read = seq_read, 2335 .llseek = seq_lseek, 2336 .release = seq_release_private, 2337}; 2338#endif 2339 2340static struct net_proto_family dn_family_ops = { 2341 .family = AF_DECnet, 2342 .create = dn_create, 2343 .owner = THIS_MODULE, 2344}; 2345 2346static const struct proto_ops dn_proto_ops = { 2347 .family = AF_DECnet, 2348 .owner = THIS_MODULE, 2349 .release = dn_release, 2350 .bind = dn_bind, 2351 .connect = dn_connect, 2352 .socketpair = sock_no_socketpair, 2353 .accept = dn_accept, 2354 .getname = dn_getname, 2355 .poll = dn_poll, 2356 .ioctl = dn_ioctl, 2357 .listen = dn_listen, 2358 .shutdown = dn_shutdown, 2359 .setsockopt = dn_setsockopt, 2360 .getsockopt = dn_getsockopt, 2361 .sendmsg = dn_sendmsg, 2362 .recvmsg = dn_recvmsg, 2363 .mmap = sock_no_mmap, 2364 .sendpage = sock_no_sendpage, 2365}; 2366 2367void dn_register_sysctl(void); 2368void dn_unregister_sysctl(void); 2369 2370MODULE_DESCRIPTION("The Linux DECnet Network Protocol"); 2371MODULE_AUTHOR("Linux DECnet Project Team"); 2372MODULE_LICENSE("GPL"); 2373MODULE_ALIAS_NETPROTO(PF_DECnet); 2374 2375static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n"; 2376 2377static int __init decnet_init(void) 2378{ 2379 int rc; 2380 2381 printk(banner); 2382 2383 rc = proto_register(&dn_proto, 1); 2384 if (rc != 0) 2385 goto out; 2386 2387 dn_neigh_init(); 2388 dn_dev_init(); 2389 dn_route_init(); 2390 dn_fib_init(); 2391 2392 sock_register(&dn_family_ops); 2393 dev_add_pack(&dn_dix_packet_type); 2394 register_netdevice_notifier(&dn_dev_notifier); 2395 2396 proc_net_fops_create("decnet", S_IRUGO, &dn_socket_seq_fops); 2397 dn_register_sysctl(); 2398out: 2399 return rc; 2400 2401} 2402module_init(decnet_init); 2403 2404/* 2405 * Prevent DECnet module unloading until its fixed properly. 2406 * Requires an audit of the code to check for memory leaks and 2407 * initialisation problems etc. 2408 */ 2409#if 0 2410static void __exit decnet_exit(void) 2411{ 2412 sock_unregister(AF_DECnet); 2413 dev_remove_pack(&dn_dix_packet_type); 2414 2415 dn_unregister_sysctl(); 2416 2417 unregister_netdevice_notifier(&dn_dev_notifier); 2418 2419 dn_route_cleanup(); 2420 dn_dev_cleanup(); 2421 dn_neigh_cleanup(); 2422 dn_fib_cleanup(); 2423 2424 proc_net_remove("decnet"); 2425 2426 proto_unregister(&dn_proto); 2427} 2428module_exit(decnet_exit); 2429#endif 2430