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.
7 * DECnet Socket Layer Interface
9 * Authors: Eduardo Marcelo Serrat <emserrat@geocities.com>
10 * Patrick Caulfield <patrick@pandh.demon.co.uk>
13 * Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
14 * version of the code. Original copyright preserved
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
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
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
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.
46 /******************************************************************************
47 (c) 1995-1998 E.M. Serrat emserrat@geocities.com
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
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.
61 Version Kernel Date Author/Comments
62 ------- ------ ---- ---------------
63 Version 0.0.1 2.0.30 01-dic-97 Eduardo Marcelo Serrat
64 (emserrat@geocities.com)
66 First Development of DECnet Socket La-
67 yer for Linux. Only supports outgoing
70 Version 0.0.2 2.1.105 20-jun-98 Patrick J. Caulfield
71 (patrick@pandh.demon.co.uk)
73 Port to new kernel development version.
75 Version 0.0.3 2.1.106 25-jun-98 Eduardo Marcelo Serrat
76 (emserrat@geocities.com)
78 Added support for incoming connections
79 so we can start developing server apps
83 Version 0.0.4 2.1.109 21-jul-98 Eduardo Marcelo Serrat
84 (emserrat@geocities.com)
86 Added support for X11R6.4. Now we can
87 use DECnet transport for X on Linux!!!
89 Version 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
95 Version 0.0.6 2.1.110 07-aug-98 Eduardo Marcelo Serrat
100 *******************************************************************************/
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/ioctls.h>
123 #include <linux/capability.h>
124 #include <linux/mm.h>
125 #include <linux/interrupt.h>
126 #include <linux/proc_fs.h>
127 #include <linux/stat.h>
128 #include <linux/init.h>
129 #include <linux/poll.h>
130 #include <net/net_namespace.h>
131 #include <net/neighbour.h>
133 #include <net/fib_rules.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>
146 static void dn_keepalive(struct sock *sk);
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)
153 static const struct proto_ops dn_proto_ops;
154 static DEFINE_RWLOCK(dn_hash_lock);
155 static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
156 static struct hlist_head dn_wild_sk;
157 static atomic_long_t decnet_memory_allocated;
159 static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags);
160 static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
162 static struct hlist_head *dn_find_list(struct sock *sk)
164 struct dn_scp *scp = DN_SK(sk);
166 if (scp->addr.sdn_flags & SDF_WILD)
167 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
169 return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
173 * Valid ports are those greater than zero and not already in use.
175 static int check_port(__le16 port)
178 struct hlist_node *node;
183 sk_for_each(sk, node, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
184 struct dn_scp *scp = DN_SK(sk);
185 if (scp->addrloc == port)
191 static unsigned short port_alloc(struct sock *sk)
193 struct dn_scp *scp = DN_SK(sk);
194 static unsigned short port = 0x2000;
195 unsigned short i_port = port;
197 while(check_port(cpu_to_le16(++port)) != 0) {
202 scp->addrloc = cpu_to_le16(port);
208 * Since this is only ever called from user
209 * level, we don't need a write_lock() version
212 static int dn_hash_sock(struct sock *sk)
214 struct dn_scp *scp = DN_SK(sk);
215 struct hlist_head *list;
218 BUG_ON(sk_hashed(sk));
220 write_lock_bh(&dn_hash_lock);
222 if (!scp->addrloc && !port_alloc(sk))
226 if ((list = dn_find_list(sk)) == NULL)
229 sk_add_node(sk, list);
232 write_unlock_bh(&dn_hash_lock);
236 static void dn_unhash_sock(struct sock *sk)
238 write_lock(&dn_hash_lock);
239 sk_del_node_init(sk);
240 write_unlock(&dn_hash_lock);
243 static void dn_unhash_sock_bh(struct sock *sk)
245 write_lock_bh(&dn_hash_lock);
246 sk_del_node_init(sk);
247 write_unlock_bh(&dn_hash_lock);
250 static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
253 unsigned int hash = addr->sdn_objnum;
256 hash = addr->sdn_objnamel;
257 for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
258 hash ^= addr->sdn_objname[i];
263 return &dn_sk_hash[hash & DN_SK_HASH_MASK];
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.
271 static void dn_rehash_sock(struct sock *sk)
273 struct hlist_head *list;
274 struct dn_scp *scp = DN_SK(sk);
276 if (scp->addr.sdn_flags & SDF_WILD)
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);
287 int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
295 *buf++ = sdn->sdn_objnum;
299 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
300 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
301 len = 3 + le16_to_cpu(sdn->sdn_objnamel);
306 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
307 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
308 len = 7 + le16_to_cpu(sdn->sdn_objnamel);
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
322 int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
329 sdn->sdn_objnamel = cpu_to_le16(0);
330 memset(sdn->sdn_objname, 0, DN_MAXOBJL);
341 sdn->sdn_objnum = type;
363 sdn->sdn_objnamel = cpu_to_le16(*data++);
364 len -= le16_to_cpu(sdn->sdn_objnamel);
366 if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
369 memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
374 struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
376 struct hlist_head *list = listen_hash(addr);
377 struct hlist_node *node;
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)
385 if (scp->addr.sdn_objnum) {
386 if (scp->addr.sdn_objnum != addr->sdn_objnum)
389 if (addr->sdn_objnum)
391 if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
393 if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
397 read_unlock(&dn_hash_lock);
401 sk = sk_head(&dn_wild_sk);
403 if (sk->sk_state == TCP_LISTEN)
409 read_unlock(&dn_hash_lock);
413 struct sock *dn_find_by_skb(struct sk_buff *skb)
415 struct dn_skb_cb *cb = DN_SKB_CB(skb);
417 struct hlist_node *node;
420 read_lock(&dn_hash_lock);
421 sk_for_each(sk, node, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
423 if (cb->src != dn_saddr2dn(&scp->peer))
425 if (cb->dst_port != scp->addrloc)
427 if (scp->addrrem && (cb->src_port != scp->addrrem))
434 read_unlock(&dn_hash_lock);
440 static void dn_destruct(struct sock *sk)
442 struct dn_scp *scp = DN_SK(sk);
444 skb_queue_purge(&scp->data_xmit_queue);
445 skb_queue_purge(&scp->other_xmit_queue);
446 skb_queue_purge(&scp->other_receive_queue);
448 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
451 static int dn_memory_pressure;
453 static void dn_enter_memory_pressure(struct sock *sk)
455 if (!dn_memory_pressure) {
456 dn_memory_pressure = 1;
460 static struct proto dn_proto = {
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),
473 static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp)
476 struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto);
482 sock->ops = &dn_proto_ops;
483 sock_init_data(sock, sk);
485 sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
486 sk->sk_destruct = dn_destruct;
488 sk->sk_family = PF_DECnet;
490 sk->sk_allocation = gfp;
491 sk->sk_sndbuf = sysctl_decnet_wmem[1];
492 sk->sk_rcvbuf = sysctl_decnet_rmem[1];
494 /* Initialization of DECnet Session Control Port */
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;
512 scp->info_loc = 0x03; /* NSP version 4.1 */
513 scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
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);
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;
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);
533 scp->persist_fxn = NULL;
534 scp->keepalive = 10 * HZ;
535 scp->keepalive_fxn = dn_keepalive;
537 init_timer(&scp->delack_timer);
538 scp->delack_pending = 0;
539 scp->delack_fxn = dn_nsp_delayed_ack;
541 dn_start_slow_timer(sk);
548 * FIXME: Should respond to SO_KEEPALIVE etc.
550 static void dn_keepalive(struct sock *sk)
552 struct dn_scp *scp = DN_SK(sk);
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.
559 if (skb_queue_empty(&scp->other_xmit_queue))
560 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
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.
571 int dn_destroy_timer(struct sock *sk)
573 struct dn_scp *scp = DN_SK(sk);
575 scp->persist = dn_nsp_persist(sk);
577 switch (scp->state) {
579 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
580 if (scp->nsp_rxtshift >= decnet_di_count)
585 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
586 if (scp->nsp_rxtshift >= decnet_dr_count)
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,
599 scp->persist = (HZ * decnet_time_wait);
604 if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
613 static void dn_destroy_sock(struct sock *sk)
615 struct dn_scp *scp = DN_SK(sk);
617 scp->nsp_rxtshift = 0; /* reset back off */
620 if (sk->sk_socket->state != SS_UNCONNECTED)
621 sk->sk_socket->state = SS_DISCONNECTING;
624 sk->sk_state = TCP_CLOSE;
626 switch (scp->state) {
628 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
630 scp->persist_fxn = dn_destroy_timer;
631 scp->persist = dn_nsp_persist(sk);
641 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
650 scp->persist_fxn = dn_destroy_timer;
651 scp->persist = dn_nsp_persist(sk);
654 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
656 dn_stop_slow_timer(sk);
658 dn_unhash_sock_bh(sk);
665 char *dn_addr2asc(__u16 addr, char *buf)
667 unsigned short node, area;
669 node = addr & 0x03ff;
671 sprintf(buf, "%hd.%hd", area, node);
678 static int dn_create(struct net *net, struct socket *sock, int protocol,
683 if (!net_eq(net, &init_net))
684 return -EAFNOSUPPORT;
686 switch (sock->type) {
688 if (protocol != DNPROTO_NSP)
689 return -EPROTONOSUPPORT;
694 return -ESOCKTNOSUPPORT;
698 if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL)) == NULL)
701 sk->sk_protocol = protocol;
708 dn_release(struct socket *sock)
710 struct sock *sk = sock->sk;
724 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
726 struct sock *sk = sock->sk;
727 struct dn_scp *scp = DN_SK(sk);
728 struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
729 struct net_device *dev, *ldev;
732 if (addr_len != sizeof(struct sockaddr_dn))
735 if (saddr->sdn_family != AF_DECnet)
738 if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
741 if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
744 if (saddr->sdn_flags & ~SDF_WILD)
747 if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
748 (saddr->sdn_flags & SDF_WILD)))
751 if (!(saddr->sdn_flags & SDF_WILD)) {
752 if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
755 for_each_netdev_rcu(&init_net, dev) {
758 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
765 return -EADDRNOTAVAIL;
771 if (sock_flag(sk, SOCK_ZAPPED)) {
772 memcpy(&scp->addr, saddr, addr_len);
773 sock_reset_flag(sk, SOCK_ZAPPED);
775 rv = dn_hash_sock(sk);
777 sock_set_flag(sk, SOCK_ZAPPED);
785 static int dn_auto_bind(struct socket *sock)
787 struct sock *sk = sock->sk;
788 struct dn_scp *scp = DN_SK(sk);
791 sock_reset_flag(sk, SOCK_ZAPPED);
793 scp->addr.sdn_flags = 0;
794 scp->addr.sdn_objnum = 0;
797 * This stuff is to keep compatibility with Eduardo's
798 * patch. I hope I can dispense with it shortly...
800 if ((scp->accessdata.acc_accl != 0) &&
801 (scp->accessdata.acc_accl <= 12)) {
803 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
804 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
806 scp->accessdata.acc_accl = 0;
807 memset(scp->accessdata.acc_acc, 0, 40);
809 /* End of compatibility stuff */
811 scp->addr.sdn_add.a_len = cpu_to_le16(2);
812 rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
814 rv = dn_hash_sock(sk);
816 sock_set_flag(sk, SOCK_ZAPPED);
822 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
824 struct dn_scp *scp = DN_SK(sk);
828 if (scp->state != DN_CR)
832 scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
833 dn_send_conn_conf(sk, allocation);
835 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
838 if (scp->state == DN_CC)
839 *timeo = schedule_timeout(*timeo);
842 if (scp->state == DN_RUN)
844 err = sock_error(sk);
847 err = sock_intr_errno(*timeo);
848 if (signal_pending(current))
853 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
855 finish_wait(sk_sleep(sk), &wait);
857 sk->sk_socket->state = SS_CONNECTED;
858 } else if (scp->state != DN_CC) {
859 sk->sk_socket->state = SS_UNCONNECTED;
864 static int dn_wait_run(struct sock *sk, long *timeo)
866 struct dn_scp *scp = DN_SK(sk);
870 if (scp->state == DN_RUN)
876 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
879 if (scp->state == DN_CI || scp->state == DN_CC)
880 *timeo = schedule_timeout(*timeo);
883 if (scp->state == DN_RUN)
885 err = sock_error(sk);
888 err = sock_intr_errno(*timeo);
889 if (signal_pending(current))
894 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
896 finish_wait(sk_sleep(sk), &wait);
899 sk->sk_socket->state = SS_CONNECTED;
900 } else if (scp->state != DN_CI && scp->state != DN_CC) {
901 sk->sk_socket->state = SS_UNCONNECTED;
906 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
908 struct socket *sock = sk->sk_socket;
909 struct dn_scp *scp = DN_SK(sk);
912 struct dst_entry *dst;
914 if (sock->state == SS_CONNECTED)
917 if (sock->state == SS_CONNECTING) {
919 if (scp->state == DN_RUN) {
920 sock->state = SS_CONNECTED;
924 if (scp->state != DN_CI && scp->state != DN_CC) {
925 sock->state = SS_UNCONNECTED;
928 return dn_wait_run(sk, timeo);
932 if (scp->state != DN_O)
935 if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
937 if (addr->sdn_family != AF_DECnet)
939 if (addr->sdn_flags & SDF_WILD)
942 if (sock_flag(sk, SOCK_ZAPPED)) {
943 err = dn_auto_bind(sk->sk_socket);
948 memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
951 memset(&fld, 0, sizeof(fld));
952 fld.flowidn_oif = sk->sk_bound_dev_if;
953 fld.daddr = dn_saddr2dn(&scp->peer);
954 fld.saddr = dn_saddr2dn(&scp->addr);
955 dn_sk_ports_copy(&fld, scp);
956 fld.flowidn_proto = DNPROTO_NSP;
957 if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
959 dst = __sk_dst_get(sk);
960 sk->sk_route_caps = dst->dev->features;
961 sock->state = SS_CONNECTING;
963 scp->segsize_loc = dst_metric_advmss(dst);
965 dn_nsp_send_conninit(sk, NSP_CI);
968 err = dn_wait_run(sk, timeo);
974 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
976 struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
977 struct sock *sk = sock->sk;
979 long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
982 err = __dn_connect(sk, addr, addrlen, &timeo, 0);
988 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
990 struct dn_scp *scp = DN_SK(sk);
992 switch (scp->state) {
996 return dn_confirm_accept(sk, timeo, sk->sk_allocation);
999 return dn_wait_run(sk, timeo);
1001 return __dn_connect(sk, addr, addrlen, timeo, flags);
1008 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1010 unsigned char *ptr = skb->data;
1012 acc->acc_userl = *ptr++;
1013 memcpy(&acc->acc_user, ptr, acc->acc_userl);
1014 ptr += acc->acc_userl;
1016 acc->acc_passl = *ptr++;
1017 memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1018 ptr += acc->acc_passl;
1020 acc->acc_accl = *ptr++;
1021 memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1023 skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1027 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1029 unsigned char *ptr = skb->data;
1030 u16 len = *ptr++; /* yes, it's 8bit on the wire */
1032 BUG_ON(len > 16); /* we've checked the contents earlier */
1033 opt->opt_optl = cpu_to_le16(len);
1034 opt->opt_status = 0;
1035 memcpy(opt->opt_data, ptr, len);
1036 skb_pull(skb, len + 1);
1039 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1042 struct sk_buff *skb = NULL;
1045 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1048 skb = skb_dequeue(&sk->sk_receive_queue);
1050 *timeo = schedule_timeout(*timeo);
1051 skb = skb_dequeue(&sk->sk_receive_queue);
1057 if (sk->sk_state != TCP_LISTEN)
1059 err = sock_intr_errno(*timeo);
1060 if (signal_pending(current))
1065 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1067 finish_wait(sk_sleep(sk), &wait);
1069 return skb == NULL ? ERR_PTR(err) : skb;
1072 static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1074 struct sock *sk = sock->sk, *newsk;
1075 struct sk_buff *skb = NULL;
1076 struct dn_skb_cb *cb;
1077 unsigned char menuver;
1080 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1081 struct dst_entry *dst;
1085 if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1090 skb = skb_dequeue(&sk->sk_receive_queue);
1092 skb = dn_wait_for_connect(sk, &timeo);
1095 return PTR_ERR(skb);
1099 cb = DN_SKB_CB(skb);
1100 sk->sk_ack_backlog--;
1101 newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation);
1102 if (newsk == NULL) {
1110 sk_dst_set(newsk, dst);
1111 skb_dst_set(skb, NULL);
1113 DN_SK(newsk)->state = DN_CR;
1114 DN_SK(newsk)->addrrem = cb->src_port;
1115 DN_SK(newsk)->services_rem = cb->services;
1116 DN_SK(newsk)->info_rem = cb->info;
1117 DN_SK(newsk)->segsize_rem = cb->segsize;
1118 DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode;
1120 if (DN_SK(newsk)->segsize_rem < 230)
1121 DN_SK(newsk)->segsize_rem = 230;
1123 if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1124 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1126 newsk->sk_state = TCP_LISTEN;
1127 memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1130 * If we are listening on a wild socket, we don't want
1131 * the newly created socket on the wrong hash queue.
1133 DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1135 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1136 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1137 *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1138 *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1140 menuver = *skb->data;
1143 if (menuver & DN_MENUVER_ACC)
1144 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1146 if (menuver & DN_MENUVER_USR)
1147 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1149 if (menuver & DN_MENUVER_PRX)
1150 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1152 if (menuver & DN_MENUVER_UIC)
1153 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1157 memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1158 sizeof(struct optdata_dn));
1159 memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1160 sizeof(struct optdata_dn));
1163 err = dn_hash_sock(newsk);
1165 sock_reset_flag(newsk, SOCK_ZAPPED);
1166 dn_send_conn_ack(newsk);
1169 * Here we use sk->sk_allocation since although the conn conf is
1170 * for the newsk, the context is the old socket.
1172 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1173 err = dn_confirm_accept(newsk, &timeo,
1176 release_sock(newsk);
1181 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1183 struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1184 struct sock *sk = sock->sk;
1185 struct dn_scp *scp = DN_SK(sk);
1187 *uaddr_len = sizeof(struct sockaddr_dn);
1192 if ((sock->state != SS_CONNECTED &&
1193 sock->state != SS_CONNECTING) &&
1194 scp->accept_mode == ACC_IMMED) {
1199 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1201 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1210 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table *wait)
1212 struct sock *sk = sock->sk;
1213 struct dn_scp *scp = DN_SK(sk);
1214 int mask = datagram_poll(file, sock, wait);
1216 if (!skb_queue_empty(&scp->other_receive_queue))
1222 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1224 struct sock *sk = sock->sk;
1225 struct dn_scp *scp = DN_SK(sk);
1226 int err = -EOPNOTSUPP;
1228 struct sk_buff *skb;
1235 return dn_dev_ioctl(cmd, (void __user *)arg);
1239 val = !skb_queue_empty(&scp->other_receive_queue);
1240 if (scp->state != DN_RUN)
1246 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1249 err = put_user(amount, (int __user *)arg);
1254 skb = skb_peek(&scp->other_receive_queue);
1258 skb_queue_walk(&sk->sk_receive_queue, skb)
1262 err = put_user(amount, (int __user *)arg);
1273 static int dn_listen(struct socket *sock, int backlog)
1275 struct sock *sk = sock->sk;
1280 if (sock_flag(sk, SOCK_ZAPPED))
1283 if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1286 sk->sk_max_ack_backlog = backlog;
1287 sk->sk_ack_backlog = 0;
1288 sk->sk_state = TCP_LISTEN;
1299 static int dn_shutdown(struct socket *sock, int how)
1301 struct sock *sk = sock->sk;
1302 struct dn_scp *scp = DN_SK(sk);
1303 int err = -ENOTCONN;
1307 if (sock->state == SS_UNCONNECTED)
1311 if (sock->state == SS_DISCONNECTING)
1315 if (scp->state == DN_O)
1318 if (how != SHUT_RDWR)
1321 sk->sk_shutdown = SHUTDOWN_MASK;
1322 dn_destroy_sock(sk);
1331 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1333 struct sock *sk = sock->sk;
1337 err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1343 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
1345 struct sock *sk = sock->sk;
1346 struct dn_scp *scp = DN_SK(sk);
1349 struct optdata_dn opt;
1350 struct accessdata_dn acc;
1354 unsigned char services;
1359 if (optlen && !optval)
1362 if (optlen > sizeof(u))
1365 if (copy_from_user(&u, optval, optlen))
1370 if (sock->state == SS_CONNECTED)
1372 if ((scp->state != DN_O) && (scp->state != DN_CR))
1375 if (optlen != sizeof(struct optdata_dn))
1378 if (le16_to_cpu(u.opt.opt_optl) > 16)
1381 memcpy(&scp->conndata_out, &u.opt, optlen);
1385 if (sock->state != SS_CONNECTED &&
1386 scp->accept_mode == ACC_IMMED)
1389 if (optlen != sizeof(struct optdata_dn))
1392 if (le16_to_cpu(u.opt.opt_optl) > 16)
1395 memcpy(&scp->discdata_out, &u.opt, optlen);
1399 if (sock->state == SS_CONNECTED)
1401 if (scp->state != DN_O)
1404 if (optlen != sizeof(struct accessdata_dn))
1407 if ((u.acc.acc_accl > DN_MAXACCL) ||
1408 (u.acc.acc_passl > DN_MAXACCL) ||
1409 (u.acc.acc_userl > DN_MAXACCL))
1412 memcpy(&scp->accessdata, &u.acc, optlen);
1415 case DSO_ACCEPTMODE:
1416 if (sock->state == SS_CONNECTED)
1418 if (scp->state != DN_O)
1421 if (optlen != sizeof(int))
1424 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1427 scp->accept_mode = (unsigned char)u.mode;
1431 if (scp->state != DN_CR)
1433 timeo = sock_rcvtimeo(sk, 0);
1434 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1438 if (scp->state != DN_CR)
1442 sk->sk_shutdown = SHUTDOWN_MASK;
1443 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1447 #ifdef CONFIG_NETFILTER
1448 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1453 return -ENOPROTOOPT;
1456 if (optlen != sizeof(unsigned long))
1458 if (u.win > NSP_MAX_WINDOW)
1459 u.win = NSP_MAX_WINDOW;
1462 scp->max_window = u.win;
1463 if (scp->snd_window > u.win)
1464 scp->snd_window = u.win;
1468 if (optlen != sizeof(int))
1470 if (scp->nonagle == 2)
1472 scp->nonagle = (u.val == 0) ? 0 : 1;
1473 /* if (scp->nonagle == 1) { Push pending frames } */
1477 if (optlen != sizeof(int))
1479 if (scp->nonagle == 1)
1481 scp->nonagle = (u.val == 0) ? 0 : 2;
1482 /* if (scp->nonagle == 0) { Push pending frames } */
1486 if (optlen != sizeof(unsigned char))
1488 if ((u.services & ~NSP_FC_MASK) != 0x01)
1490 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1492 scp->services_loc = u.services;
1496 if (optlen != sizeof(unsigned char))
1500 scp->info_loc = u.info;
1507 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1509 struct sock *sk = sock->sk;
1513 err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1519 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1521 struct sock *sk = sock->sk;
1522 struct dn_scp *scp = DN_SK(sk);
1523 struct linkinfo_dn link;
1525 void *r_data = NULL;
1528 if(get_user(r_len , optlen))
1533 if (r_len > sizeof(struct optdata_dn))
1534 r_len = sizeof(struct optdata_dn);
1535 r_data = &scp->conndata_in;
1539 if (r_len > sizeof(struct optdata_dn))
1540 r_len = sizeof(struct optdata_dn);
1541 r_data = &scp->discdata_in;
1545 if (r_len > sizeof(struct accessdata_dn))
1546 r_len = sizeof(struct accessdata_dn);
1547 r_data = &scp->accessdata;
1550 case DSO_ACCEPTMODE:
1551 if (r_len > sizeof(unsigned char))
1552 r_len = sizeof(unsigned char);
1553 r_data = &scp->accept_mode;
1557 if (r_len > sizeof(struct linkinfo_dn))
1558 r_len = sizeof(struct linkinfo_dn);
1560 memset(&link, 0, sizeof(link));
1562 switch (sock->state) {
1564 link.idn_linkstate = LL_CONNECTING;
1566 case SS_DISCONNECTING:
1567 link.idn_linkstate = LL_DISCONNECTING;
1570 link.idn_linkstate = LL_RUNNING;
1573 link.idn_linkstate = LL_INACTIVE;
1576 link.idn_segsize = scp->segsize_rem;
1581 #ifdef CONFIG_NETFILTER
1585 if (get_user(len, optlen))
1588 ret = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1590 ret = put_user(len, optlen);
1598 return -ENOPROTOOPT;
1601 if (r_len > sizeof(unsigned long))
1602 r_len = sizeof(unsigned long);
1603 r_data = &scp->max_window;
1607 if (r_len > sizeof(int))
1608 r_len = sizeof(int);
1609 val = (scp->nonagle == 1);
1614 if (r_len > sizeof(int))
1615 r_len = sizeof(int);
1616 val = (scp->nonagle == 2);
1621 if (r_len > sizeof(unsigned char))
1622 r_len = sizeof(unsigned char);
1623 r_data = &scp->services_rem;
1627 if (r_len > sizeof(unsigned char))
1628 r_len = sizeof(unsigned char);
1629 r_data = &scp->info_rem;
1634 if (copy_to_user(optval, r_data, r_len))
1636 if (put_user(r_len, optlen))
1644 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1646 struct sk_buff *skb;
1649 if (flags & MSG_OOB)
1650 return !skb_queue_empty(q) ? 1 : 0;
1652 skb_queue_walk(q, skb) {
1653 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1656 if (cb->nsp_flags & 0x40) {
1657 /* SOCK_SEQPACKET reads to EOM */
1658 if (sk->sk_type == SOCK_SEQPACKET)
1660 /* so does SOCK_STREAM unless WAITALL is specified */
1661 if (!(flags & MSG_WAITALL))
1665 /* minimum data length for read exceeded */
1674 static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1675 struct msghdr *msg, size_t size, int flags)
1677 struct sock *sk = sock->sk;
1678 struct dn_scp *scp = DN_SK(sk);
1679 struct sk_buff_head *queue = &sk->sk_receive_queue;
1680 size_t target = size > 1 ? 1 : 0;
1683 struct sk_buff *skb, *n;
1684 struct dn_skb_cb *cb = NULL;
1685 unsigned char eor = 0;
1686 long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1690 if (sock_flag(sk, SOCK_ZAPPED)) {
1691 rv = -EADDRNOTAVAIL;
1695 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1700 rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1704 if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1709 if (flags & MSG_OOB)
1710 queue = &scp->other_receive_queue;
1712 if (flags & MSG_WAITALL)
1717 * See if there is data ready to read, sleep if there isn't
1725 if (!skb_queue_empty(&scp->other_receive_queue)) {
1726 if (!(flags & MSG_OOB)) {
1727 msg->msg_flags |= MSG_OOB;
1728 if (!scp->other_report) {
1729 scp->other_report = 1;
1735 if (scp->state != DN_RUN)
1738 if (signal_pending(current)) {
1739 rv = sock_intr_errno(timeo);
1743 if (dn_data_ready(sk, queue, flags, target))
1746 if (flags & MSG_DONTWAIT) {
1751 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1752 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1753 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target));
1754 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1755 finish_wait(sk_sleep(sk), &wait);
1758 skb_queue_walk_safe(queue, skb, n) {
1759 unsigned int chunk = skb->len;
1760 cb = DN_SKB_CB(skb);
1762 if ((chunk + copied) > size)
1763 chunk = size - copied;
1765 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1771 if (!(flags & MSG_PEEK))
1772 skb_pull(skb, chunk);
1774 eor = cb->nsp_flags & 0x40;
1776 if (skb->len == 0) {
1777 skb_unlink(skb, queue);
1780 * N.B. Don't refer to skb or cb after this point
1783 if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1784 scp->flowloc_sw = DN_SEND;
1785 dn_nsp_send_link(sk, DN_SEND, 0);
1790 if (sk->sk_type == SOCK_SEQPACKET)
1792 if (!(flags & MSG_WAITALL))
1796 if (flags & MSG_OOB)
1799 if (copied >= target)
1806 if (eor && (sk->sk_type == SOCK_SEQPACKET))
1807 msg->msg_flags |= MSG_EOR;
1811 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1813 if ((rv >= 0) && msg->msg_name) {
1814 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1815 msg->msg_namelen = sizeof(struct sockaddr_dn);
1824 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1826 unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1827 if (skb_queue_len(queue) >= scp->snd_window)
1829 if (fctype != NSP_FC_NONE) {
1830 if (flags & MSG_OOB) {
1831 if (scp->flowrem_oth == 0)
1834 if (scp->flowrem_dat == 0)
1842 * The DECnet spec requires that the "routing layer" accepts packets which
1843 * are at least 230 bytes in size. This excludes any headers which the NSP
1844 * layer might add, so we always assume that we'll be using the maximal
1845 * length header on data packets. The variation in length is due to the
1846 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1847 * make much practical difference.
1849 unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
1851 unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
1853 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1854 mtu -= LL_RESERVED_SPACE(dev);
1855 if (dn_db->use_long)
1859 mtu -= DN_MAX_NSP_DATA_HEADER;
1862 * 21 = long header, 16 = guess at MAC header length
1864 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1871 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1873 struct dst_entry *dst = __sk_dst_get(sk);
1874 struct dn_scp *scp = DN_SK(sk);
1875 int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1877 /* Other data messages are limited to 16 bytes per packet */
1878 if (flags & MSG_OOB)
1881 /* This works out the maximum size of segment we can send out */
1883 u32 mtu = dst_mtu(dst);
1884 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1891 * N.B. We get the timeout wrong here, but then we always did get it
1892 * wrong before and this is another step along the road to correcting
1893 * it. It ought to get updated each time we pass through the routine,
1894 * but in practise it probably doesn't matter too much for now.
1896 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1897 unsigned long datalen, int noblock,
1900 struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1903 skb->protocol = htons(ETH_P_DNA_RT);
1904 skb->pkt_type = PACKET_OUTGOING;
1909 static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1910 struct msghdr *msg, size_t size)
1912 struct sock *sk = sock->sk;
1913 struct dn_scp *scp = DN_SK(sk);
1915 struct sk_buff_head *queue = &scp->data_xmit_queue;
1916 int flags = msg->msg_flags;
1919 int addr_len = msg->msg_namelen;
1920 struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1921 struct sk_buff *skb = NULL;
1922 struct dn_skb_cb *cb;
1924 unsigned char fctype;
1927 if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1930 if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1934 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1936 * The only difference between stream sockets and sequenced packet
1937 * sockets is that the stream sockets always behave as if MSG_EOR
1940 if (sock->type == SOCK_STREAM) {
1941 if (flags & MSG_EOR) {
1949 err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1953 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1955 if (!(flags & MSG_NOSIGNAL))
1956 send_sig(SIGPIPE, current, 0);
1960 if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1961 dst_negative_advice(sk);
1963 mss = scp->segsize_rem;
1964 fctype = scp->services_rem & NSP_FC_MASK;
1966 mss = dn_current_mss(sk, flags);
1968 if (flags & MSG_OOB) {
1969 queue = &scp->other_xmit_queue;
1976 scp->persist_fxn = dn_nsp_xmit_timeout;
1978 while(sent < size) {
1979 err = sock_error(sk);
1983 if (signal_pending(current)) {
1984 err = sock_intr_errno(timeo);
1989 * Calculate size that we wish to send.
1997 * Wait for queue size to go down below the window
2000 if (dn_queue_too_long(scp, queue, flags)) {
2003 if (flags & MSG_DONTWAIT) {
2008 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2009 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2010 sk_wait_event(sk, &timeo,
2011 !dn_queue_too_long(scp, queue, flags));
2012 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2013 finish_wait(sk_sleep(sk), &wait);
2018 * Get a suitably sized skb.
2019 * 64 is a bit of a hack really, but its larger than any
2020 * link-layer headers and has served us well as a good
2021 * guess as to their real length.
2023 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2024 flags & MSG_DONTWAIT, &err);
2032 cb = DN_SKB_CB(skb);
2034 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2036 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2041 if (flags & MSG_OOB) {
2042 cb->nsp_flags = 0x30;
2043 if (fctype != NSP_FC_NONE)
2046 cb->nsp_flags = 0x00;
2047 if (scp->seg_total == 0)
2048 cb->nsp_flags |= 0x20;
2050 scp->seg_total += len;
2052 if (((sent + len) == size) && (flags & MSG_EOR)) {
2053 cb->nsp_flags |= 0x40;
2055 if (fctype == NSP_FC_SCMC)
2058 if (fctype == NSP_FC_SRC)
2063 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2066 scp->persist = dn_nsp_persist(sk);
2075 return sent ? sent : err;
2078 err = sk_stream_error(sk, flags, err);
2083 static int dn_device_event(struct notifier_block *this, unsigned long event,
2086 struct net_device *dev = (struct net_device *)ptr;
2088 if (!net_eq(dev_net(dev), &init_net))
2105 static struct notifier_block dn_dev_notifier = {
2106 .notifier_call = dn_device_event,
2109 extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
2111 static struct packet_type dn_dix_packet_type __read_mostly = {
2112 .type = cpu_to_be16(ETH_P_DNA_RT),
2113 .func = dn_route_rcv,
2116 #ifdef CONFIG_PROC_FS
2117 struct dn_iter_state {
2121 static struct sock *dn_socket_get_first(struct seq_file *seq)
2123 struct dn_iter_state *state = seq->private;
2124 struct sock *n = NULL;
2126 for(state->bucket = 0;
2127 state->bucket < DN_SK_HASH_SIZE;
2129 n = sk_head(&dn_sk_hash[state->bucket]);
2137 static struct sock *dn_socket_get_next(struct seq_file *seq,
2140 struct dn_iter_state *state = seq->private;
2146 if (++state->bucket >= DN_SK_HASH_SIZE)
2148 n = sk_head(&dn_sk_hash[state->bucket]);
2154 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2156 struct sock *sk = dn_socket_get_first(seq);
2159 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2162 return *pos ? NULL : sk;
2165 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2168 read_lock_bh(&dn_hash_lock);
2169 rc = socket_get_idx(seq, &pos);
2171 read_unlock_bh(&dn_hash_lock);
2176 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2178 return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2181 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2185 if (v == SEQ_START_TOKEN) {
2186 rc = dn_socket_get_idx(seq, 0);
2190 rc = dn_socket_get_next(seq, v);
2193 read_unlock_bh(&dn_hash_lock);
2199 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2201 if (v && v != SEQ_START_TOKEN)
2202 read_unlock_bh(&dn_hash_lock);
2205 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2207 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2211 switch (le16_to_cpu(dn->sdn_objnamel)) {
2213 sprintf(buf, "%d", dn->sdn_objnum);
2216 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2217 buf[i] = dn->sdn_objname[i];
2218 if (IS_NOT_PRINTABLE(buf[i]))
2225 static char *dn_state2asc(unsigned char state)
2265 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2267 struct dn_scp *scp = DN_SK(sk);
2268 char buf1[DN_ASCBUF_LEN];
2269 char buf2[DN_ASCBUF_LEN];
2270 char local_object[DN_MAXOBJL+3];
2271 char remote_object[DN_MAXOBJL+3];
2273 dn_printable_object(&scp->addr, local_object);
2274 dn_printable_object(&scp->peer, remote_object);
2277 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2278 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2279 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
2287 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
2295 dn_state2asc(scp->state),
2296 ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2299 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2301 if (v == SEQ_START_TOKEN) {
2302 seq_puts(seq, "Local Remote\n");
2304 dn_socket_format_entry(seq, v);
2309 static const struct seq_operations dn_socket_seq_ops = {
2310 .start = dn_socket_seq_start,
2311 .next = dn_socket_seq_next,
2312 .stop = dn_socket_seq_stop,
2313 .show = dn_socket_seq_show,
2316 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2318 return seq_open_private(file, &dn_socket_seq_ops,
2319 sizeof(struct dn_iter_state));
2322 static const struct file_operations dn_socket_seq_fops = {
2323 .owner = THIS_MODULE,
2324 .open = dn_socket_seq_open,
2326 .llseek = seq_lseek,
2327 .release = seq_release_private,
2331 static const struct net_proto_family dn_family_ops = {
2332 .family = AF_DECnet,
2333 .create = dn_create,
2334 .owner = THIS_MODULE,
2337 static const struct proto_ops dn_proto_ops = {
2338 .family = AF_DECnet,
2339 .owner = THIS_MODULE,
2340 .release = dn_release,
2342 .connect = dn_connect,
2343 .socketpair = sock_no_socketpair,
2344 .accept = dn_accept,
2345 .getname = dn_getname,
2348 .listen = dn_listen,
2349 .shutdown = dn_shutdown,
2350 .setsockopt = dn_setsockopt,
2351 .getsockopt = dn_getsockopt,
2352 .sendmsg = dn_sendmsg,
2353 .recvmsg = dn_recvmsg,
2354 .mmap = sock_no_mmap,
2355 .sendpage = sock_no_sendpage,
2358 void dn_register_sysctl(void);
2359 void dn_unregister_sysctl(void);
2361 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2362 MODULE_AUTHOR("Linux DECnet Project Team");
2363 MODULE_LICENSE("GPL");
2364 MODULE_ALIAS_NETPROTO(PF_DECnet);
2366 static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2368 static int __init decnet_init(void)
2374 rc = proto_register(&dn_proto, 1);
2383 sock_register(&dn_family_ops);
2384 dev_add_pack(&dn_dix_packet_type);
2385 register_netdevice_notifier(&dn_dev_notifier);
2387 proc_net_fops_create(&init_net, "decnet", S_IRUGO, &dn_socket_seq_fops);
2388 dn_register_sysctl();
2393 module_init(decnet_init);
2396 * Prevent DECnet module unloading until its fixed properly.
2397 * Requires an audit of the code to check for memory leaks and
2398 * initialisation problems etc.
2401 static void __exit decnet_exit(void)
2403 sock_unregister(AF_DECnet);
2404 rtnl_unregister_all(PF_DECnet);
2405 dev_remove_pack(&dn_dix_packet_type);
2407 dn_unregister_sysctl();
2409 unregister_netdevice_notifier(&dn_dev_notifier);
2416 proc_net_remove(&init_net, "decnet");
2418 proto_unregister(&dn_proto);
2420 rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */
2422 module_exit(decnet_exit);