1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * DECnet An implementation of the DECnet protocol suite for the LINUX
5 * operating system. DECnet is implemented using the BSD Socket
6 * interface as the means of communication with the user level.
8 * DECnet Socket Layer Interface
10 * Authors: Eduardo Marcelo Serrat <emserrat@geocities.com>
11 * Patrick Caulfield <patrick@pandh.demon.co.uk>
14 * Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
15 * version of the code. Original copyright preserved
17 * Steve Whitehouse: Some bug fixes, cleaning up some code to make it
18 * compatible with my routing layer.
19 * Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
21 * Steve Whitehouse: Further bug fixes, checking module code still works
22 * with new routing layer.
23 * Steve Whitehouse: Additional set/get_sockopt() calls.
24 * Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
26 * Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
27 * way. Didn't manage it entirely, but its better.
28 * Steve Whitehouse: ditto for sendmsg().
29 * Steve Whitehouse: A selection of bug fixes to various things.
30 * Steve Whitehouse: Added TIOCOUTQ ioctl.
31 * Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
32 * Steve Whitehouse: Fixes to connect() error returns.
33 * Patrick Caulfield: Fixes to delayed acceptance logic.
34 * David S. Miller: New socket locking
35 * Steve Whitehouse: Socket list hashing/locking
36 * Arnaldo C. Melo: use capable, not suser
37 * Steve Whitehouse: Removed unused code. Fix to use sk->allocation
39 * Patrick Caulfield: /proc/net/decnet now has object name/number
40 * Steve Whitehouse: Fixed local port allocation, hashed sk list
41 * Matthew Wilcox: Fixes for dn_ioctl()
42 * Steve Whitehouse: New connect/accept logic to allow timeouts and
43 * prepare for sendpage etc.
47 /******************************************************************************
48 (c) 1995-1998 E.M. Serrat emserrat@geocities.com
53 Version Kernel Date Author/Comments
54 ------- ------ ---- ---------------
55 Version 0.0.1 2.0.30 01-dic-97 Eduardo Marcelo Serrat
56 (emserrat@geocities.com)
58 First Development of DECnet Socket La-
59 yer for Linux. Only supports outgoing
62 Version 0.0.2 2.1.105 20-jun-98 Patrick J. Caulfield
63 (patrick@pandh.demon.co.uk)
65 Port to new kernel development version.
67 Version 0.0.3 2.1.106 25-jun-98 Eduardo Marcelo Serrat
68 (emserrat@geocities.com)
70 Added support for incoming connections
71 so we can start developing server apps
75 Version 0.0.4 2.1.109 21-jul-98 Eduardo Marcelo Serrat
76 (emserrat@geocities.com)
78 Added support for X11R6.4. Now we can
79 use DECnet transport for X on Linux!!!
81 Version 0.0.5 2.1.110 01-aug-98 Eduardo Marcelo Serrat
82 (emserrat@geocities.com)
83 Removed bugs on flow control
84 Removed bugs on incoming accessdata
87 Version 0.0.6 2.1.110 07-aug-98 Eduardo Marcelo Serrat
92 *******************************************************************************/
94 #include <linux/module.h>
95 #include <linux/errno.h>
96 #include <linux/types.h>
97 #include <linux/slab.h>
98 #include <linux/socket.h>
100 #include <linux/kernel.h>
101 #include <linux/sched/signal.h>
102 #include <linux/timer.h>
103 #include <linux/string.h>
104 #include <linux/sockios.h>
105 #include <linux/net.h>
106 #include <linux/netdevice.h>
107 #include <linux/inet.h>
108 #include <linux/route.h>
109 #include <linux/netfilter.h>
110 #include <linux/seq_file.h>
111 #include <net/sock.h>
112 #include <net/tcp_states.h>
113 #include <net/flow.h>
114 #include <asm/ioctls.h>
115 #include <linux/capability.h>
116 #include <linux/mm.h>
117 #include <linux/interrupt.h>
118 #include <linux/proc_fs.h>
119 #include <linux/stat.h>
120 #include <linux/init.h>
121 #include <linux/poll.h>
122 #include <linux/jiffies.h>
123 #include <net/net_namespace.h>
124 #include <net/neighbour.h>
126 #include <net/fib_rules.h>
129 #include <net/dn_nsp.h>
130 #include <net/dn_dev.h>
131 #include <net/dn_route.h>
132 #include <net/dn_fib.h>
133 #include <net/dn_neigh.h>
140 static void dn_keepalive(struct sock *sk);
142 #define DN_SK_HASH_SHIFT 8
143 #define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
144 #define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
147 static const struct proto_ops dn_proto_ops;
148 static DEFINE_RWLOCK(dn_hash_lock);
149 static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
150 static struct hlist_head dn_wild_sk;
151 static atomic_long_t decnet_memory_allocated;
153 static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags);
154 static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
156 static struct hlist_head *dn_find_list(struct sock *sk)
158 struct dn_scp *scp = DN_SK(sk);
160 if (scp->addr.sdn_flags & SDF_WILD)
161 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
163 return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
167 * Valid ports are those greater than zero and not already in use.
169 static int check_port(__le16 port)
176 sk_for_each(sk, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
177 struct dn_scp *scp = DN_SK(sk);
178 if (scp->addrloc == port)
184 static unsigned short port_alloc(struct sock *sk)
186 struct dn_scp *scp = DN_SK(sk);
187 static unsigned short port = 0x2000;
188 unsigned short i_port = port;
190 while(check_port(cpu_to_le16(++port)) != 0) {
195 scp->addrloc = cpu_to_le16(port);
201 * Since this is only ever called from user
202 * level, we don't need a write_lock() version
205 static int dn_hash_sock(struct sock *sk)
207 struct dn_scp *scp = DN_SK(sk);
208 struct hlist_head *list;
211 BUG_ON(sk_hashed(sk));
213 write_lock_bh(&dn_hash_lock);
215 if (!scp->addrloc && !port_alloc(sk))
219 if ((list = dn_find_list(sk)) == NULL)
222 sk_add_node(sk, list);
225 write_unlock_bh(&dn_hash_lock);
229 static void dn_unhash_sock(struct sock *sk)
231 write_lock(&dn_hash_lock);
232 sk_del_node_init(sk);
233 write_unlock(&dn_hash_lock);
236 static void dn_unhash_sock_bh(struct sock *sk)
238 write_lock_bh(&dn_hash_lock);
239 sk_del_node_init(sk);
240 write_unlock_bh(&dn_hash_lock);
243 static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
246 unsigned int hash = addr->sdn_objnum;
249 hash = addr->sdn_objnamel;
250 for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
251 hash ^= addr->sdn_objname[i];
256 return &dn_sk_hash[hash & DN_SK_HASH_MASK];
260 * Called to transform a socket from bound (i.e. with a local address)
261 * into a listening socket (doesn't need a local port number) and rehashes
262 * based upon the object name/number.
264 static void dn_rehash_sock(struct sock *sk)
266 struct hlist_head *list;
267 struct dn_scp *scp = DN_SK(sk);
269 if (scp->addr.sdn_flags & SDF_WILD)
272 write_lock_bh(&dn_hash_lock);
273 sk_del_node_init(sk);
274 DN_SK(sk)->addrloc = 0;
275 list = listen_hash(&DN_SK(sk)->addr);
276 sk_add_node(sk, list);
277 write_unlock_bh(&dn_hash_lock);
280 int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
288 *buf++ = sdn->sdn_objnum;
292 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
293 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
294 len = 3 + le16_to_cpu(sdn->sdn_objnamel);
299 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
300 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
301 len = 7 + le16_to_cpu(sdn->sdn_objnamel);
309 * On reception of usernames, we handle types 1 and 0 for destination
310 * addresses only. Types 2 and 4 are used for source addresses, but the
311 * UIC, GIC are ignored and they are both treated the same way. Type 3
312 * is never used as I've no idea what its purpose might be or what its
315 int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
322 sdn->sdn_objnamel = cpu_to_le16(0);
323 memset(sdn->sdn_objname, 0, DN_MAXOBJL);
334 sdn->sdn_objnum = type;
356 sdn->sdn_objnamel = cpu_to_le16(*data++);
357 len -= le16_to_cpu(sdn->sdn_objnamel);
359 if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
362 memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
367 struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
369 struct hlist_head *list = listen_hash(addr);
372 read_lock(&dn_hash_lock);
373 sk_for_each(sk, list) {
374 struct dn_scp *scp = DN_SK(sk);
375 if (sk->sk_state != TCP_LISTEN)
377 if (scp->addr.sdn_objnum) {
378 if (scp->addr.sdn_objnum != addr->sdn_objnum)
381 if (addr->sdn_objnum)
383 if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
385 if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
389 read_unlock(&dn_hash_lock);
393 sk = sk_head(&dn_wild_sk);
395 if (sk->sk_state == TCP_LISTEN)
401 read_unlock(&dn_hash_lock);
405 struct sock *dn_find_by_skb(struct sk_buff *skb)
407 struct dn_skb_cb *cb = DN_SKB_CB(skb);
411 read_lock(&dn_hash_lock);
412 sk_for_each(sk, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
414 if (cb->src != dn_saddr2dn(&scp->peer))
416 if (cb->dst_port != scp->addrloc)
418 if (scp->addrrem && (cb->src_port != scp->addrrem))
425 read_unlock(&dn_hash_lock);
431 static void dn_destruct(struct sock *sk)
433 struct dn_scp *scp = DN_SK(sk);
435 skb_queue_purge(&scp->data_xmit_queue);
436 skb_queue_purge(&scp->other_xmit_queue);
437 skb_queue_purge(&scp->other_receive_queue);
439 dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
442 static unsigned long dn_memory_pressure;
444 static void dn_enter_memory_pressure(struct sock *sk)
446 if (!dn_memory_pressure) {
447 dn_memory_pressure = 1;
451 static struct proto dn_proto = {
453 .owner = THIS_MODULE,
454 .enter_memory_pressure = dn_enter_memory_pressure,
455 .memory_pressure = &dn_memory_pressure,
456 .memory_allocated = &decnet_memory_allocated,
457 .sysctl_mem = sysctl_decnet_mem,
458 .sysctl_wmem = sysctl_decnet_wmem,
459 .sysctl_rmem = sysctl_decnet_rmem,
460 .max_header = DN_MAX_NSP_DATA_HEADER + 64,
461 .obj_size = sizeof(struct dn_sock),
464 static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp, int kern)
467 struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto, kern);
473 sock->ops = &dn_proto_ops;
474 sock_init_data(sock, sk);
476 sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
477 sk->sk_destruct = dn_destruct;
478 sk->sk_no_check_tx = 1;
479 sk->sk_family = PF_DECnet;
481 sk->sk_allocation = gfp;
482 sk->sk_sndbuf = sysctl_decnet_wmem[1];
483 sk->sk_rcvbuf = sysctl_decnet_rmem[1];
485 /* Initialization of DECnet Session Control Port */
487 scp->state = DN_O; /* Open */
488 scp->numdat = 1; /* Next data seg to tx */
489 scp->numoth = 1; /* Next oth data to tx */
490 scp->ackxmt_dat = 0; /* Last data seg ack'ed */
491 scp->ackxmt_oth = 0; /* Last oth data ack'ed */
492 scp->ackrcv_dat = 0; /* Highest data ack recv*/
493 scp->ackrcv_oth = 0; /* Last oth data ack rec*/
494 scp->flowrem_sw = DN_SEND;
495 scp->flowloc_sw = DN_SEND;
496 scp->flowrem_dat = 0;
497 scp->flowrem_oth = 1;
498 scp->flowloc_dat = 0;
499 scp->flowloc_oth = 1;
500 scp->services_rem = 0;
501 scp->services_loc = 1 | NSP_FC_NONE;
503 scp->info_loc = 0x03; /* NSP version 4.1 */
504 scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
507 scp->accept_mode = ACC_IMMED;
508 scp->addr.sdn_family = AF_DECnet;
509 scp->peer.sdn_family = AF_DECnet;
510 scp->accessdata.acc_accl = 5;
511 memcpy(scp->accessdata.acc_acc, "LINUX", 5);
513 scp->max_window = NSP_MAX_WINDOW;
514 scp->snd_window = NSP_MIN_WINDOW;
515 scp->nsp_srtt = NSP_INITIAL_SRTT;
516 scp->nsp_rttvar = NSP_INITIAL_RTTVAR;
517 scp->nsp_rxtshift = 0;
519 skb_queue_head_init(&scp->data_xmit_queue);
520 skb_queue_head_init(&scp->other_xmit_queue);
521 skb_queue_head_init(&scp->other_receive_queue);
524 scp->persist_fxn = NULL;
525 scp->keepalive = 10 * HZ;
526 scp->keepalive_fxn = dn_keepalive;
528 dn_start_slow_timer(sk);
535 * FIXME: Should respond to SO_KEEPALIVE etc.
537 static void dn_keepalive(struct sock *sk)
539 struct dn_scp *scp = DN_SK(sk);
542 * By checking the other_data transmit queue is empty
543 * we are double checking that we are not sending too
544 * many of these keepalive frames.
546 if (skb_queue_empty(&scp->other_xmit_queue))
547 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
552 * Timer for shutdown/destroyed sockets.
553 * When socket is dead & no packets have been sent for a
554 * certain amount of time, they are removed by this
555 * routine. Also takes care of sending out DI & DC
556 * frames at correct times.
558 int dn_destroy_timer(struct sock *sk)
560 struct dn_scp *scp = DN_SK(sk);
562 scp->persist = dn_nsp_persist(sk);
564 switch (scp->state) {
566 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
567 if (scp->nsp_rxtshift >= decnet_di_count)
572 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
573 if (scp->nsp_rxtshift >= decnet_dr_count)
578 if (scp->nsp_rxtshift < decnet_dn_count) {
579 /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
580 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
586 scp->persist = (HZ * decnet_time_wait);
591 if (time_after_eq(jiffies, scp->stamp + HZ * decnet_time_wait)) {
600 static void dn_destroy_sock(struct sock *sk)
602 struct dn_scp *scp = DN_SK(sk);
604 scp->nsp_rxtshift = 0; /* reset back off */
607 if (sk->sk_socket->state != SS_UNCONNECTED)
608 sk->sk_socket->state = SS_DISCONNECTING;
611 sk->sk_state = TCP_CLOSE;
613 switch (scp->state) {
615 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
617 scp->persist_fxn = dn_destroy_timer;
618 scp->persist = dn_nsp_persist(sk);
629 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
639 scp->persist_fxn = dn_destroy_timer;
640 scp->persist = dn_nsp_persist(sk);
643 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
646 dn_stop_slow_timer(sk);
648 dn_unhash_sock_bh(sk);
655 char *dn_addr2asc(__u16 addr, char *buf)
657 unsigned short node, area;
659 node = addr & 0x03ff;
661 sprintf(buf, "%hd.%hd", area, node);
668 static int dn_create(struct net *net, struct socket *sock, int protocol,
673 if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
676 if (!net_eq(net, &init_net))
677 return -EAFNOSUPPORT;
679 switch (sock->type) {
681 if (protocol != DNPROTO_NSP)
682 return -EPROTONOSUPPORT;
687 return -ESOCKTNOSUPPORT;
691 if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL, kern)) == NULL)
694 sk->sk_protocol = protocol;
701 dn_release(struct socket *sock)
703 struct sock *sk = sock->sk;
717 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
719 struct sock *sk = sock->sk;
720 struct dn_scp *scp = DN_SK(sk);
721 struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
722 struct net_device *dev, *ldev;
725 if (addr_len != sizeof(struct sockaddr_dn))
728 if (saddr->sdn_family != AF_DECnet)
731 if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
734 if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
737 if (saddr->sdn_flags & ~SDF_WILD)
740 if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
741 (saddr->sdn_flags & SDF_WILD)))
744 if (!(saddr->sdn_flags & SDF_WILD)) {
745 if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
748 for_each_netdev_rcu(&init_net, dev) {
751 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
758 return -EADDRNOTAVAIL;
764 if (sock_flag(sk, SOCK_ZAPPED)) {
765 memcpy(&scp->addr, saddr, addr_len);
766 sock_reset_flag(sk, SOCK_ZAPPED);
768 rv = dn_hash_sock(sk);
770 sock_set_flag(sk, SOCK_ZAPPED);
778 static int dn_auto_bind(struct socket *sock)
780 struct sock *sk = sock->sk;
781 struct dn_scp *scp = DN_SK(sk);
784 sock_reset_flag(sk, SOCK_ZAPPED);
786 scp->addr.sdn_flags = 0;
787 scp->addr.sdn_objnum = 0;
790 * This stuff is to keep compatibility with Eduardo's
791 * patch. I hope I can dispense with it shortly...
793 if ((scp->accessdata.acc_accl != 0) &&
794 (scp->accessdata.acc_accl <= 12)) {
796 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
797 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
799 scp->accessdata.acc_accl = 0;
800 memset(scp->accessdata.acc_acc, 0, 40);
802 /* End of compatibility stuff */
804 scp->addr.sdn_add.a_len = cpu_to_le16(2);
805 rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
807 rv = dn_hash_sock(sk);
809 sock_set_flag(sk, SOCK_ZAPPED);
815 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
817 struct dn_scp *scp = DN_SK(sk);
821 if (scp->state != DN_CR)
825 scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
826 dn_send_conn_conf(sk, allocation);
828 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
831 if (scp->state == DN_CC)
832 *timeo = schedule_timeout(*timeo);
835 if (scp->state == DN_RUN)
837 err = sock_error(sk);
840 err = sock_intr_errno(*timeo);
841 if (signal_pending(current))
846 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
848 finish_wait(sk_sleep(sk), &wait);
850 sk->sk_socket->state = SS_CONNECTED;
851 } else if (scp->state != DN_CC) {
852 sk->sk_socket->state = SS_UNCONNECTED;
857 static int dn_wait_run(struct sock *sk, long *timeo)
859 struct dn_scp *scp = DN_SK(sk);
863 if (scp->state == DN_RUN)
869 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
872 if (scp->state == DN_CI || scp->state == DN_CC)
873 *timeo = schedule_timeout(*timeo);
876 if (scp->state == DN_RUN)
878 err = sock_error(sk);
881 err = sock_intr_errno(*timeo);
882 if (signal_pending(current))
887 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
889 finish_wait(sk_sleep(sk), &wait);
892 sk->sk_socket->state = SS_CONNECTED;
893 } else if (scp->state != DN_CI && scp->state != DN_CC) {
894 sk->sk_socket->state = SS_UNCONNECTED;
899 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
901 struct socket *sock = sk->sk_socket;
902 struct dn_scp *scp = DN_SK(sk);
905 struct dst_entry *dst;
907 if (sock->state == SS_CONNECTED)
910 if (sock->state == SS_CONNECTING) {
912 if (scp->state == DN_RUN) {
913 sock->state = SS_CONNECTED;
917 if (scp->state != DN_CI && scp->state != DN_CC) {
918 sock->state = SS_UNCONNECTED;
921 return dn_wait_run(sk, timeo);
925 if (scp->state != DN_O)
928 if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
930 if (addr->sdn_family != AF_DECnet)
932 if (addr->sdn_flags & SDF_WILD)
935 if (sock_flag(sk, SOCK_ZAPPED)) {
936 err = dn_auto_bind(sk->sk_socket);
941 memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
944 memset(&fld, 0, sizeof(fld));
945 fld.flowidn_oif = sk->sk_bound_dev_if;
946 fld.daddr = dn_saddr2dn(&scp->peer);
947 fld.saddr = dn_saddr2dn(&scp->addr);
948 dn_sk_ports_copy(&fld, scp);
949 fld.flowidn_proto = DNPROTO_NSP;
950 if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
952 dst = __sk_dst_get(sk);
953 sk->sk_route_caps = dst->dev->features;
954 sock->state = SS_CONNECTING;
956 scp->segsize_loc = dst_metric_advmss(dst);
958 dn_nsp_send_conninit(sk, NSP_CI);
961 err = dn_wait_run(sk, timeo);
967 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
969 struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
970 struct sock *sk = sock->sk;
972 long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
975 err = __dn_connect(sk, addr, addrlen, &timeo, 0);
981 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
983 struct dn_scp *scp = DN_SK(sk);
985 switch (scp->state) {
989 return dn_confirm_accept(sk, timeo, sk->sk_allocation);
992 return dn_wait_run(sk, timeo);
994 return __dn_connect(sk, addr, addrlen, timeo, flags);
1001 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1003 unsigned char *ptr = skb->data;
1005 acc->acc_userl = *ptr++;
1006 memcpy(&acc->acc_user, ptr, acc->acc_userl);
1007 ptr += acc->acc_userl;
1009 acc->acc_passl = *ptr++;
1010 memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1011 ptr += acc->acc_passl;
1013 acc->acc_accl = *ptr++;
1014 memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1016 skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1020 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1022 unsigned char *ptr = skb->data;
1023 u16 len = *ptr++; /* yes, it's 8bit on the wire */
1025 BUG_ON(len > 16); /* we've checked the contents earlier */
1026 opt->opt_optl = cpu_to_le16(len);
1027 opt->opt_status = 0;
1028 memcpy(opt->opt_data, ptr, len);
1029 skb_pull(skb, len + 1);
1032 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1035 struct sk_buff *skb = NULL;
1038 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1041 skb = skb_dequeue(&sk->sk_receive_queue);
1043 *timeo = schedule_timeout(*timeo);
1044 skb = skb_dequeue(&sk->sk_receive_queue);
1050 if (sk->sk_state != TCP_LISTEN)
1052 err = sock_intr_errno(*timeo);
1053 if (signal_pending(current))
1058 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1060 finish_wait(sk_sleep(sk), &wait);
1062 return skb == NULL ? ERR_PTR(err) : skb;
1065 static int dn_accept(struct socket *sock, struct socket *newsock, int flags,
1068 struct sock *sk = sock->sk, *newsk;
1069 struct sk_buff *skb = NULL;
1070 struct dn_skb_cb *cb;
1071 unsigned char menuver;
1074 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1075 struct dst_entry *dst;
1079 if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1084 skb = skb_dequeue(&sk->sk_receive_queue);
1086 skb = dn_wait_for_connect(sk, &timeo);
1089 return PTR_ERR(skb);
1093 cb = DN_SKB_CB(skb);
1094 sk->sk_ack_backlog--;
1095 newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation, kern);
1096 if (newsk == NULL) {
1104 sk_dst_set(newsk, dst);
1105 skb_dst_set(skb, NULL);
1107 DN_SK(newsk)->state = DN_CR;
1108 DN_SK(newsk)->addrrem = cb->src_port;
1109 DN_SK(newsk)->services_rem = cb->services;
1110 DN_SK(newsk)->info_rem = cb->info;
1111 DN_SK(newsk)->segsize_rem = cb->segsize;
1112 DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode;
1114 if (DN_SK(newsk)->segsize_rem < 230)
1115 DN_SK(newsk)->segsize_rem = 230;
1117 if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1118 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1120 newsk->sk_state = TCP_LISTEN;
1121 memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1124 * If we are listening on a wild socket, we don't want
1125 * the newly created socket on the wrong hash queue.
1127 DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1129 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1130 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1131 *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1132 *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1134 menuver = *skb->data;
1137 if (menuver & DN_MENUVER_ACC)
1138 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1140 if (menuver & DN_MENUVER_USR)
1141 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1143 if (menuver & DN_MENUVER_PRX)
1144 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1146 if (menuver & DN_MENUVER_UIC)
1147 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1151 memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1152 sizeof(struct optdata_dn));
1153 memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1154 sizeof(struct optdata_dn));
1157 err = dn_hash_sock(newsk);
1159 sock_reset_flag(newsk, SOCK_ZAPPED);
1160 dn_send_conn_ack(newsk);
1163 * Here we use sk->sk_allocation since although the conn conf is
1164 * for the newsk, the context is the old socket.
1166 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1167 err = dn_confirm_accept(newsk, &timeo,
1170 release_sock(newsk);
1175 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int peer)
1177 struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1178 struct sock *sk = sock->sk;
1179 struct dn_scp *scp = DN_SK(sk);
1184 if ((sock->state != SS_CONNECTED &&
1185 sock->state != SS_CONNECTING) &&
1186 scp->accept_mode == ACC_IMMED) {
1191 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1193 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1198 return sizeof(struct sockaddr_dn);
1202 static __poll_t dn_poll(struct file *file, struct socket *sock, poll_table *wait)
1204 struct sock *sk = sock->sk;
1205 struct dn_scp *scp = DN_SK(sk);
1206 __poll_t mask = datagram_poll(file, sock, wait);
1208 if (!skb_queue_empty_lockless(&scp->other_receive_queue))
1209 mask |= EPOLLRDBAND;
1214 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1216 struct sock *sk = sock->sk;
1217 struct dn_scp *scp = DN_SK(sk);
1218 int err = -EOPNOTSUPP;
1220 struct sk_buff *skb;
1227 return dn_dev_ioctl(cmd, (void __user *)arg);
1231 val = !skb_queue_empty(&scp->other_receive_queue);
1232 if (scp->state != DN_RUN)
1238 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1241 err = put_user(amount, (int __user *)arg);
1246 skb = skb_peek(&scp->other_receive_queue);
1250 skb_queue_walk(&sk->sk_receive_queue, skb)
1254 err = put_user(amount, (int __user *)arg);
1265 static int dn_listen(struct socket *sock, int backlog)
1267 struct sock *sk = sock->sk;
1272 if (sock_flag(sk, SOCK_ZAPPED))
1275 if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1278 sk->sk_max_ack_backlog = backlog;
1279 sk->sk_ack_backlog = 0;
1280 sk->sk_state = TCP_LISTEN;
1291 static int dn_shutdown(struct socket *sock, int how)
1293 struct sock *sk = sock->sk;
1294 struct dn_scp *scp = DN_SK(sk);
1295 int err = -ENOTCONN;
1299 if (sock->state == SS_UNCONNECTED)
1303 if (sock->state == SS_DISCONNECTING)
1307 if (scp->state == DN_O)
1310 if (how != SHUT_RDWR)
1313 sk->sk_shutdown = SHUTDOWN_MASK;
1314 dn_destroy_sock(sk);
1323 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1325 struct sock *sk = sock->sk;
1329 err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1331 #ifdef CONFIG_NETFILTER
1332 /* we need to exclude all possible ENOPROTOOPTs except default case */
1333 if (err == -ENOPROTOOPT && optname != DSO_LINKINFO &&
1334 optname != DSO_STREAM && optname != DSO_SEQPACKET)
1335 err = nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1341 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
1343 struct sock *sk = sock->sk;
1344 struct dn_scp *scp = DN_SK(sk);
1347 struct optdata_dn opt;
1348 struct accessdata_dn acc;
1352 unsigned char services;
1357 if (optlen && !optval)
1360 if (optlen > sizeof(u))
1363 if (copy_from_user(&u, optval, optlen))
1368 if (sock->state == SS_CONNECTED)
1370 if ((scp->state != DN_O) && (scp->state != DN_CR))
1373 if (optlen != sizeof(struct optdata_dn))
1376 if (le16_to_cpu(u.opt.opt_optl) > 16)
1379 memcpy(&scp->conndata_out, &u.opt, optlen);
1383 if (sock->state != SS_CONNECTED &&
1384 scp->accept_mode == ACC_IMMED)
1387 if (optlen != sizeof(struct optdata_dn))
1390 if (le16_to_cpu(u.opt.opt_optl) > 16)
1393 memcpy(&scp->discdata_out, &u.opt, optlen);
1397 if (sock->state == SS_CONNECTED)
1399 if (scp->state != DN_O)
1402 if (optlen != sizeof(struct accessdata_dn))
1405 if ((u.acc.acc_accl > DN_MAXACCL) ||
1406 (u.acc.acc_passl > DN_MAXACCL) ||
1407 (u.acc.acc_userl > DN_MAXACCL))
1410 memcpy(&scp->accessdata, &u.acc, optlen);
1413 case DSO_ACCEPTMODE:
1414 if (sock->state == SS_CONNECTED)
1416 if (scp->state != DN_O)
1419 if (optlen != sizeof(int))
1422 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1425 scp->accept_mode = (unsigned char)u.mode;
1429 if (scp->state != DN_CR)
1431 timeo = sock_rcvtimeo(sk, 0);
1432 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1436 if (scp->state != DN_CR)
1440 sk->sk_shutdown = SHUTDOWN_MASK;
1441 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1445 if (optlen != sizeof(unsigned long))
1447 if (u.win > NSP_MAX_WINDOW)
1448 u.win = NSP_MAX_WINDOW;
1451 scp->max_window = u.win;
1452 if (scp->snd_window > u.win)
1453 scp->snd_window = u.win;
1457 if (optlen != sizeof(int))
1459 if (scp->nonagle == TCP_NAGLE_CORK)
1461 scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_OFF;
1462 /* if (scp->nonagle == 1) { Push pending frames } */
1466 if (optlen != sizeof(int))
1468 if (scp->nonagle == TCP_NAGLE_OFF)
1470 scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_CORK;
1471 /* if (scp->nonagle == 0) { Push pending frames } */
1475 if (optlen != sizeof(unsigned char))
1477 if ((u.services & ~NSP_FC_MASK) != 0x01)
1479 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1481 scp->services_loc = u.services;
1485 if (optlen != sizeof(unsigned char))
1489 scp->info_loc = u.info;
1496 return -ENOPROTOOPT;
1502 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1504 struct sock *sk = sock->sk;
1508 err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1510 #ifdef CONFIG_NETFILTER
1511 if (err == -ENOPROTOOPT && optname != DSO_STREAM &&
1512 optname != DSO_SEQPACKET && optname != DSO_CONACCEPT &&
1513 optname != DSO_CONREJECT) {
1516 if (get_user(len, optlen))
1519 err = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1521 err = put_user(len, optlen);
1528 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1530 struct sock *sk = sock->sk;
1531 struct dn_scp *scp = DN_SK(sk);
1532 struct linkinfo_dn link;
1534 void *r_data = NULL;
1537 if(get_user(r_len , optlen))
1542 if (r_len > sizeof(struct optdata_dn))
1543 r_len = sizeof(struct optdata_dn);
1544 r_data = &scp->conndata_in;
1548 if (r_len > sizeof(struct optdata_dn))
1549 r_len = sizeof(struct optdata_dn);
1550 r_data = &scp->discdata_in;
1554 if (r_len > sizeof(struct accessdata_dn))
1555 r_len = sizeof(struct accessdata_dn);
1556 r_data = &scp->accessdata;
1559 case DSO_ACCEPTMODE:
1560 if (r_len > sizeof(unsigned char))
1561 r_len = sizeof(unsigned char);
1562 r_data = &scp->accept_mode;
1566 if (r_len > sizeof(struct linkinfo_dn))
1567 r_len = sizeof(struct linkinfo_dn);
1569 memset(&link, 0, sizeof(link));
1571 switch (sock->state) {
1573 link.idn_linkstate = LL_CONNECTING;
1575 case SS_DISCONNECTING:
1576 link.idn_linkstate = LL_DISCONNECTING;
1579 link.idn_linkstate = LL_RUNNING;
1582 link.idn_linkstate = LL_INACTIVE;
1585 link.idn_segsize = scp->segsize_rem;
1590 if (r_len > sizeof(unsigned long))
1591 r_len = sizeof(unsigned long);
1592 r_data = &scp->max_window;
1596 if (r_len > sizeof(int))
1597 r_len = sizeof(int);
1598 val = (scp->nonagle == TCP_NAGLE_OFF);
1603 if (r_len > sizeof(int))
1604 r_len = sizeof(int);
1605 val = (scp->nonagle == TCP_NAGLE_CORK);
1610 if (r_len > sizeof(unsigned char))
1611 r_len = sizeof(unsigned char);
1612 r_data = &scp->services_rem;
1616 if (r_len > sizeof(unsigned char))
1617 r_len = sizeof(unsigned char);
1618 r_data = &scp->info_rem;
1626 return -ENOPROTOOPT;
1630 if (copy_to_user(optval, r_data, r_len))
1632 if (put_user(r_len, optlen))
1640 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1642 struct sk_buff *skb;
1645 if (flags & MSG_OOB)
1646 return !skb_queue_empty(q) ? 1 : 0;
1648 skb_queue_walk(q, skb) {
1649 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1652 if (cb->nsp_flags & 0x40) {
1653 /* SOCK_SEQPACKET reads to EOM */
1654 if (sk->sk_type == SOCK_SEQPACKET)
1656 /* so does SOCK_STREAM unless WAITALL is specified */
1657 if (!(flags & MSG_WAITALL))
1661 /* minimum data length for read exceeded */
1670 static int dn_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1673 struct sock *sk = sock->sk;
1674 struct dn_scp *scp = DN_SK(sk);
1675 struct sk_buff_head *queue = &sk->sk_receive_queue;
1676 size_t target = size > 1 ? 1 : 0;
1679 struct sk_buff *skb, *n;
1680 struct dn_skb_cb *cb = NULL;
1681 unsigned char eor = 0;
1682 long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1686 if (sock_flag(sk, SOCK_ZAPPED)) {
1687 rv = -EADDRNOTAVAIL;
1691 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1696 rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1700 if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1705 if (flags & MSG_OOB)
1706 queue = &scp->other_receive_queue;
1708 if (flags & MSG_WAITALL)
1713 * See if there is data ready to read, sleep if there isn't
1716 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1721 if (!skb_queue_empty(&scp->other_receive_queue)) {
1722 if (!(flags & MSG_OOB)) {
1723 msg->msg_flags |= MSG_OOB;
1724 if (!scp->other_report) {
1725 scp->other_report = 1;
1731 if (scp->state != DN_RUN)
1734 if (signal_pending(current)) {
1735 rv = sock_intr_errno(timeo);
1739 if (dn_data_ready(sk, queue, flags, target))
1742 if (flags & MSG_DONTWAIT) {
1747 add_wait_queue(sk_sleep(sk), &wait);
1748 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1749 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target), &wait);
1750 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1751 remove_wait_queue(sk_sleep(sk), &wait);
1754 skb_queue_walk_safe(queue, skb, n) {
1755 unsigned int chunk = skb->len;
1756 cb = DN_SKB_CB(skb);
1758 if ((chunk + copied) > size)
1759 chunk = size - copied;
1761 if (memcpy_to_msg(msg, skb->data, chunk)) {
1767 if (!(flags & MSG_PEEK))
1768 skb_pull(skb, chunk);
1770 eor = cb->nsp_flags & 0x40;
1772 if (skb->len == 0) {
1773 skb_unlink(skb, queue);
1776 * N.B. Don't refer to skb or cb after this point
1779 if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1780 scp->flowloc_sw = DN_SEND;
1781 dn_nsp_send_link(sk, DN_SEND, 0);
1786 if (sk->sk_type == SOCK_SEQPACKET)
1788 if (!(flags & MSG_WAITALL))
1792 if (flags & MSG_OOB)
1795 if (copied >= target)
1802 if (eor && (sk->sk_type == SOCK_SEQPACKET))
1803 msg->msg_flags |= MSG_EOR;
1807 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1809 if ((rv >= 0) && msg->msg_name) {
1810 __sockaddr_check_size(sizeof(struct sockaddr_dn));
1811 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1812 msg->msg_namelen = sizeof(struct sockaddr_dn);
1821 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1823 unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1824 if (skb_queue_len(queue) >= scp->snd_window)
1826 if (fctype != NSP_FC_NONE) {
1827 if (flags & MSG_OOB) {
1828 if (scp->flowrem_oth == 0)
1831 if (scp->flowrem_dat == 0)
1839 * The DECnet spec requires that the "routing layer" accepts packets which
1840 * are at least 230 bytes in size. This excludes any headers which the NSP
1841 * layer might add, so we always assume that we'll be using the maximal
1842 * length header on data packets. The variation in length is due to the
1843 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1844 * make much practical difference.
1846 unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
1848 unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
1850 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1851 mtu -= LL_RESERVED_SPACE(dev);
1852 if (dn_db->use_long)
1856 mtu -= DN_MAX_NSP_DATA_HEADER;
1859 * 21 = long header, 16 = guess at MAC header length
1861 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1868 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1870 struct dst_entry *dst = __sk_dst_get(sk);
1871 struct dn_scp *scp = DN_SK(sk);
1872 int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1874 /* Other data messages are limited to 16 bytes per packet */
1875 if (flags & MSG_OOB)
1878 /* This works out the maximum size of segment we can send out */
1880 u32 mtu = dst_mtu(dst);
1881 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1888 * N.B. We get the timeout wrong here, but then we always did get it
1889 * wrong before and this is another step along the road to correcting
1890 * it. It ought to get updated each time we pass through the routine,
1891 * but in practise it probably doesn't matter too much for now.
1893 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1894 unsigned long datalen, int noblock,
1897 struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1900 skb->protocol = htons(ETH_P_DNA_RT);
1901 skb->pkt_type = PACKET_OUTGOING;
1906 static int dn_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
1908 struct sock *sk = sock->sk;
1909 struct dn_scp *scp = DN_SK(sk);
1911 struct sk_buff_head *queue = &scp->data_xmit_queue;
1912 int flags = msg->msg_flags;
1915 int addr_len = msg->msg_namelen;
1916 DECLARE_SOCKADDR(struct sockaddr_dn *, addr, msg->msg_name);
1917 struct sk_buff *skb = NULL;
1918 struct dn_skb_cb *cb;
1920 unsigned char fctype;
1923 if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1926 if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1930 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1932 * The only difference between stream sockets and sequenced packet
1933 * sockets is that the stream sockets always behave as if MSG_EOR
1936 if (sock->type == SOCK_STREAM) {
1937 if (flags & MSG_EOR) {
1945 err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1949 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1951 if (!(flags & MSG_NOSIGNAL))
1952 send_sig(SIGPIPE, current, 0);
1956 if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1957 dst_negative_advice(sk);
1959 mss = scp->segsize_rem;
1960 fctype = scp->services_rem & NSP_FC_MASK;
1962 mss = dn_current_mss(sk, flags);
1964 if (flags & MSG_OOB) {
1965 queue = &scp->other_xmit_queue;
1972 scp->persist_fxn = dn_nsp_xmit_timeout;
1974 while(sent < size) {
1975 err = sock_error(sk);
1979 if (signal_pending(current)) {
1980 err = sock_intr_errno(timeo);
1985 * Calculate size that we wish to send.
1993 * Wait for queue size to go down below the window
1996 if (dn_queue_too_long(scp, queue, flags)) {
1997 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1999 if (flags & MSG_DONTWAIT) {
2004 add_wait_queue(sk_sleep(sk), &wait);
2005 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2006 sk_wait_event(sk, &timeo,
2007 !dn_queue_too_long(scp, queue, flags), &wait);
2008 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2009 remove_wait_queue(sk_sleep(sk), &wait);
2014 * Get a suitably sized skb.
2015 * 64 is a bit of a hack really, but its larger than any
2016 * link-layer headers and has served us well as a good
2017 * guess as to their real length.
2019 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2020 flags & MSG_DONTWAIT, &err);
2028 cb = DN_SKB_CB(skb);
2030 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2032 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
2037 if (flags & MSG_OOB) {
2038 cb->nsp_flags = 0x30;
2039 if (fctype != NSP_FC_NONE)
2042 cb->nsp_flags = 0x00;
2043 if (scp->seg_total == 0)
2044 cb->nsp_flags |= 0x20;
2046 scp->seg_total += len;
2048 if (((sent + len) == size) && (flags & MSG_EOR)) {
2049 cb->nsp_flags |= 0x40;
2051 if (fctype == NSP_FC_SCMC)
2054 if (fctype == NSP_FC_SRC)
2059 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2062 scp->persist = dn_nsp_persist(sk);
2071 return sent ? sent : err;
2074 err = sk_stream_error(sk, flags, err);
2079 static int dn_device_event(struct notifier_block *this, unsigned long event,
2082 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2084 if (!net_eq(dev_net(dev), &init_net))
2101 static struct notifier_block dn_dev_notifier = {
2102 .notifier_call = dn_device_event,
2105 static struct packet_type dn_dix_packet_type __read_mostly = {
2106 .type = cpu_to_be16(ETH_P_DNA_RT),
2107 .func = dn_route_rcv,
2110 #ifdef CONFIG_PROC_FS
2111 struct dn_iter_state {
2115 static struct sock *dn_socket_get_first(struct seq_file *seq)
2117 struct dn_iter_state *state = seq->private;
2118 struct sock *n = NULL;
2120 for(state->bucket = 0;
2121 state->bucket < DN_SK_HASH_SIZE;
2123 n = sk_head(&dn_sk_hash[state->bucket]);
2131 static struct sock *dn_socket_get_next(struct seq_file *seq,
2134 struct dn_iter_state *state = seq->private;
2140 if (++state->bucket >= DN_SK_HASH_SIZE)
2142 n = sk_head(&dn_sk_hash[state->bucket]);
2148 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2150 struct sock *sk = dn_socket_get_first(seq);
2153 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2156 return *pos ? NULL : sk;
2159 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2162 read_lock_bh(&dn_hash_lock);
2163 rc = socket_get_idx(seq, &pos);
2165 read_unlock_bh(&dn_hash_lock);
2170 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2172 return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2175 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2179 if (v == SEQ_START_TOKEN) {
2180 rc = dn_socket_get_idx(seq, 0);
2184 rc = dn_socket_get_next(seq, v);
2187 read_unlock_bh(&dn_hash_lock);
2193 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2195 if (v && v != SEQ_START_TOKEN)
2196 read_unlock_bh(&dn_hash_lock);
2199 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2201 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2205 switch (le16_to_cpu(dn->sdn_objnamel)) {
2207 sprintf(buf, "%d", dn->sdn_objnum);
2210 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2211 buf[i] = dn->sdn_objname[i];
2212 if (IS_NOT_PRINTABLE(buf[i]))
2219 static char *dn_state2asc(unsigned char state)
2259 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2261 struct dn_scp *scp = DN_SK(sk);
2262 char buf1[DN_ASCBUF_LEN];
2263 char buf2[DN_ASCBUF_LEN];
2264 char local_object[DN_MAXOBJL+3];
2265 char remote_object[DN_MAXOBJL+3];
2267 dn_printable_object(&scp->addr, local_object);
2268 dn_printable_object(&scp->peer, remote_object);
2271 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2272 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2273 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
2281 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
2289 dn_state2asc(scp->state),
2290 ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2293 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2295 if (v == SEQ_START_TOKEN) {
2296 seq_puts(seq, "Local Remote\n");
2298 dn_socket_format_entry(seq, v);
2303 static const struct seq_operations dn_socket_seq_ops = {
2304 .start = dn_socket_seq_start,
2305 .next = dn_socket_seq_next,
2306 .stop = dn_socket_seq_stop,
2307 .show = dn_socket_seq_show,
2311 static const struct net_proto_family dn_family_ops = {
2312 .family = AF_DECnet,
2313 .create = dn_create,
2314 .owner = THIS_MODULE,
2317 static const struct proto_ops dn_proto_ops = {
2318 .family = AF_DECnet,
2319 .owner = THIS_MODULE,
2320 .release = dn_release,
2322 .connect = dn_connect,
2323 .socketpair = sock_no_socketpair,
2324 .accept = dn_accept,
2325 .getname = dn_getname,
2328 .listen = dn_listen,
2329 .shutdown = dn_shutdown,
2330 .setsockopt = dn_setsockopt,
2331 .getsockopt = dn_getsockopt,
2332 .sendmsg = dn_sendmsg,
2333 .recvmsg = dn_recvmsg,
2334 .mmap = sock_no_mmap,
2335 .sendpage = sock_no_sendpage,
2338 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2339 MODULE_AUTHOR("Linux DECnet Project Team");
2340 MODULE_LICENSE("GPL");
2341 MODULE_ALIAS_NETPROTO(PF_DECnet);
2343 static const char banner[] __initconst = KERN_INFO
2344 "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2346 static int __init decnet_init(void)
2352 rc = proto_register(&dn_proto, 1);
2361 sock_register(&dn_family_ops);
2362 dev_add_pack(&dn_dix_packet_type);
2363 register_netdevice_notifier(&dn_dev_notifier);
2365 proc_create_seq_private("decnet", 0444, init_net.proc_net,
2366 &dn_socket_seq_ops, sizeof(struct dn_iter_state),
2368 dn_register_sysctl();
2373 module_init(decnet_init);
2376 * Prevent DECnet module unloading until its fixed properly.
2377 * Requires an audit of the code to check for memory leaks and
2378 * initialisation problems etc.
2381 static void __exit decnet_exit(void)
2383 sock_unregister(AF_DECnet);
2384 rtnl_unregister_all(PF_DECnet);
2385 dev_remove_pack(&dn_dix_packet_type);
2387 dn_unregister_sysctl();
2389 unregister_netdevice_notifier(&dn_dev_notifier);
2396 remove_proc_entry("decnet", init_net.proc_net);
2398 proto_unregister(&dn_proto);
2400 rcu_barrier(); /* Wait for completion of call_rcu()'s */
2402 module_exit(decnet_exit);