2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 * Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
9 * Copyright Darryl Miles G7LED (dlm@g7led.demon.co.uk)
11 #include <linux/module.h>
12 #include <linux/moduleparam.h>
13 #include <linux/capability.h>
14 #include <linux/errno.h>
15 #include <linux/types.h>
16 #include <linux/socket.h>
18 #include <linux/slab.h>
19 #include <linux/kernel.h>
20 #include <linux/sched.h>
21 #include <linux/timer.h>
22 #include <linux/string.h>
23 #include <linux/sockios.h>
24 #include <linux/net.h>
25 #include <linux/stat.h>
27 #include <linux/inet.h>
28 #include <linux/netdevice.h>
29 #include <linux/if_arp.h>
30 #include <linux/skbuff.h>
31 #include <net/net_namespace.h>
33 #include <asm/uaccess.h>
34 #include <linux/fcntl.h>
35 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
37 #include <linux/interrupt.h>
38 #include <linux/notifier.h>
39 #include <net/netrom.h>
40 #include <linux/proc_fs.h>
41 #include <linux/seq_file.h>
43 #include <net/tcp_states.h>
45 #include <linux/init.h>
47 static int nr_ndevs = 4;
49 int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL;
50 int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS;
51 int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL;
52 int sysctl_netrom_transport_timeout = NR_DEFAULT_T1;
53 int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2;
54 int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2;
55 int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4;
56 int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW;
57 int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE;
58 int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING;
59 int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS;
60 int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET;
62 static unsigned short circuit = 0x101;
64 static HLIST_HEAD(nr_list);
65 static DEFINE_SPINLOCK(nr_list_lock);
67 static const struct proto_ops nr_proto_ops;
70 * NETROM network devices are virtual network devices encapsulating NETROM
71 * frames into AX.25 which will be sent through an AX.25 device, so form a
72 * special "super class" of normal net devices; split their locks off into a
73 * separate class since they always nest.
75 static struct lock_class_key nr_netdev_xmit_lock_key;
76 static struct lock_class_key nr_netdev_addr_lock_key;
78 static void nr_set_lockdep_one(struct net_device *dev,
79 struct netdev_queue *txq,
82 lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key);
85 static void nr_set_lockdep_key(struct net_device *dev)
87 lockdep_set_class(&dev->addr_list_lock, &nr_netdev_addr_lock_key);
88 netdev_for_each_tx_queue(dev, nr_set_lockdep_one, NULL);
92 * Socket removal during an interrupt is now safe.
94 static void nr_remove_socket(struct sock *sk)
96 spin_lock_bh(&nr_list_lock);
98 spin_unlock_bh(&nr_list_lock);
102 * Kill all bound sockets on a dropped device.
104 static void nr_kill_by_device(struct net_device *dev)
108 spin_lock_bh(&nr_list_lock);
109 sk_for_each(s, &nr_list)
110 if (nr_sk(s)->device == dev)
111 nr_disconnect(s, ENETUNREACH);
112 spin_unlock_bh(&nr_list_lock);
116 * Handle device status changes.
118 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
120 struct net_device *dev = (struct net_device *)ptr;
122 if (!net_eq(dev_net(dev), &init_net))
125 if (event != NETDEV_DOWN)
128 nr_kill_by_device(dev);
129 nr_rt_device_down(dev);
135 * Add a socket to the bound sockets list.
137 static void nr_insert_socket(struct sock *sk)
139 spin_lock_bh(&nr_list_lock);
140 sk_add_node(sk, &nr_list);
141 spin_unlock_bh(&nr_list_lock);
145 * Find a socket that wants to accept the Connect Request we just
148 static struct sock *nr_find_listener(ax25_address *addr)
152 spin_lock_bh(&nr_list_lock);
153 sk_for_each(s, &nr_list)
154 if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
155 s->sk_state == TCP_LISTEN) {
161 spin_unlock_bh(&nr_list_lock);
166 * Find a connected NET/ROM socket given my circuit IDs.
168 static struct sock *nr_find_socket(unsigned char index, unsigned char id)
172 spin_lock_bh(&nr_list_lock);
173 sk_for_each(s, &nr_list) {
174 struct nr_sock *nr = nr_sk(s);
176 if (nr->my_index == index && nr->my_id == id) {
183 spin_unlock_bh(&nr_list_lock);
188 * Find a connected NET/ROM socket given their circuit IDs.
190 static struct sock *nr_find_peer(unsigned char index, unsigned char id,
195 spin_lock_bh(&nr_list_lock);
196 sk_for_each(s, &nr_list) {
197 struct nr_sock *nr = nr_sk(s);
199 if (nr->your_index == index && nr->your_id == id &&
200 !ax25cmp(&nr->dest_addr, dest)) {
207 spin_unlock_bh(&nr_list_lock);
212 * Find next free circuit ID.
214 static unsigned short nr_find_next_circuit(void)
216 unsigned short id = circuit;
224 if (i != 0 && j != 0) {
225 if ((sk=nr_find_socket(i, j)) == NULL)
239 void nr_destroy_socket(struct sock *);
242 * Handler for deferred kills.
244 static void nr_destroy_timer(unsigned long data)
246 struct sock *sk=(struct sock *)data;
249 nr_destroy_socket(sk);
255 * This is called from user mode and the timers. Thus it protects itself
256 * against interrupt users but doesn't worry about being called during
257 * work. Once it is removed from the queue no interrupt or bottom half
258 * will touch it and we are (fairly 8-) ) safe.
260 void nr_destroy_socket(struct sock *sk)
264 nr_remove_socket(sk);
266 nr_stop_heartbeat(sk);
270 nr_stop_idletimer(sk);
272 nr_clear_queues(sk); /* Flush the queues */
274 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
275 if (skb->sk != sk) { /* A pending connection */
276 /* Queue the unaccepted socket for death */
277 sock_set_flag(skb->sk, SOCK_DEAD);
278 nr_start_heartbeat(skb->sk);
279 nr_sk(skb->sk)->state = NR_STATE_0;
285 if (sk_has_allocations(sk)) {
286 /* Defer: outstanding buffers */
287 sk->sk_timer.function = nr_destroy_timer;
288 sk->sk_timer.expires = jiffies + 2 * HZ;
289 add_timer(&sk->sk_timer);
295 * Handling for system calls applied via the various interfaces to a
296 * NET/ROM socket object.
299 static int nr_setsockopt(struct socket *sock, int level, int optname,
300 char __user *optval, unsigned int optlen)
302 struct sock *sk = sock->sk;
303 struct nr_sock *nr = nr_sk(sk);
306 if (level != SOL_NETROM)
309 if (optlen < sizeof(unsigned int))
312 if (get_user(opt, (unsigned int __user *)optval))
317 if (opt < 1 || opt > ULONG_MAX / HZ)
323 if (opt < 1 || opt > ULONG_MAX / HZ)
329 if (opt < 1 || opt > 31)
335 if (opt < 1 || opt > ULONG_MAX / HZ)
341 if (opt > ULONG_MAX / (60 * HZ))
343 nr->idle = opt * 60 * HZ;
351 static int nr_getsockopt(struct socket *sock, int level, int optname,
352 char __user *optval, int __user *optlen)
354 struct sock *sk = sock->sk;
355 struct nr_sock *nr = nr_sk(sk);
359 if (level != SOL_NETROM)
362 if (get_user(len, optlen))
386 val = nr->idle / (60 * HZ);
393 len = min_t(unsigned int, len, sizeof(int));
395 if (put_user(len, optlen))
398 return copy_to_user(optval, &val, len) ? -EFAULT : 0;
401 static int nr_listen(struct socket *sock, int backlog)
403 struct sock *sk = sock->sk;
406 if (sk->sk_state != TCP_LISTEN) {
407 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
408 sk->sk_max_ack_backlog = backlog;
409 sk->sk_state = TCP_LISTEN;
418 static struct proto nr_proto = {
420 .owner = THIS_MODULE,
421 .obj_size = sizeof(struct nr_sock),
424 static int nr_create(struct net *net, struct socket *sock, int protocol,
430 if (!net_eq(net, &init_net))
431 return -EAFNOSUPPORT;
433 if (sock->type != SOCK_SEQPACKET || protocol != 0)
434 return -ESOCKTNOSUPPORT;
436 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto);
442 sock_init_data(sock, sk);
444 sock->ops = &nr_proto_ops;
445 sk->sk_protocol = protocol;
447 skb_queue_head_init(&nr->ack_queue);
448 skb_queue_head_init(&nr->reseq_queue);
449 skb_queue_head_init(&nr->frag_queue);
454 msecs_to_jiffies(sysctl_netrom_transport_timeout);
456 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
458 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
460 msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
462 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
463 nr->window = sysctl_netrom_transport_requested_window_size;
466 nr->state = NR_STATE_0;
471 static struct sock *nr_make_new(struct sock *osk)
474 struct nr_sock *nr, *onr;
476 if (osk->sk_type != SOCK_SEQPACKET)
479 sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot);
485 sock_init_data(NULL, sk);
487 sk->sk_type = osk->sk_type;
488 sk->sk_priority = osk->sk_priority;
489 sk->sk_protocol = osk->sk_protocol;
490 sk->sk_rcvbuf = osk->sk_rcvbuf;
491 sk->sk_sndbuf = osk->sk_sndbuf;
492 sk->sk_state = TCP_ESTABLISHED;
493 sock_copy_flags(sk, osk);
495 skb_queue_head_init(&nr->ack_queue);
496 skb_queue_head_init(&nr->reseq_queue);
497 skb_queue_head_init(&nr->frag_queue);
507 nr->idle = onr->idle;
508 nr->window = onr->window;
510 nr->device = onr->device;
511 nr->bpqext = onr->bpqext;
516 static int nr_release(struct socket *sock)
518 struct sock *sk = sock->sk;
521 if (sk == NULL) return 0;
532 nr_disconnect(sk, 0);
533 nr_destroy_socket(sk);
539 nr_write_internal(sk, NR_DISCREQ);
540 nr_start_t1timer(sk);
543 nr_stop_idletimer(sk);
544 nr->state = NR_STATE_2;
545 sk->sk_state = TCP_CLOSE;
546 sk->sk_shutdown |= SEND_SHUTDOWN;
547 sk->sk_state_change(sk);
548 sock_set_flag(sk, SOCK_DESTROY);
562 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
564 struct sock *sk = sock->sk;
565 struct nr_sock *nr = nr_sk(sk);
566 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
567 struct net_device *dev;
568 ax25_uid_assoc *user;
569 ax25_address *source;
572 if (!sock_flag(sk, SOCK_ZAPPED)) {
576 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
580 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
584 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
588 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
590 return -EADDRNOTAVAIL;
594 * Only the super user can set an arbitrary user callsign.
596 if (addr->fsa_ax25.sax25_ndigis == 1) {
597 if (!capable(CAP_NET_BIND_SERVICE)) {
602 nr->user_addr = addr->fsa_digipeater[0];
603 nr->source_addr = addr->fsa_ax25.sax25_call;
605 source = &addr->fsa_ax25.sax25_call;
607 user = ax25_findbyuid(current_euid());
609 nr->user_addr = user->call;
612 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
617 nr->user_addr = *source;
620 nr->source_addr = *source;
624 nr_insert_socket(sk);
626 sock_reset_flag(sk, SOCK_ZAPPED);
633 static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
634 int addr_len, int flags)
636 struct sock *sk = sock->sk;
637 struct nr_sock *nr = nr_sk(sk);
638 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
639 ax25_address *source = NULL;
640 ax25_uid_assoc *user;
641 struct net_device *dev;
645 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
646 sock->state = SS_CONNECTED;
647 goto out_release; /* Connect completed during a ERESTARTSYS event */
650 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
651 sock->state = SS_UNCONNECTED;
656 if (sk->sk_state == TCP_ESTABLISHED) {
657 err = -EISCONN; /* No reconnect on a seqpacket socket */
661 sk->sk_state = TCP_CLOSE;
662 sock->state = SS_UNCONNECTED;
664 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
668 if (addr->sax25_family != AF_NETROM) {
672 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */
673 sock_reset_flag(sk, SOCK_ZAPPED);
675 if ((dev = nr_dev_first()) == NULL) {
679 source = (ax25_address *)dev->dev_addr;
681 user = ax25_findbyuid(current_euid());
683 nr->user_addr = user->call;
686 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
691 nr->user_addr = *source;
694 nr->source_addr = *source;
698 nr_insert_socket(sk); /* Finish the bind */
701 nr->dest_addr = addr->sax25_call;
704 circuit = nr_find_next_circuit();
707 nr->my_index = circuit / 256;
708 nr->my_id = circuit % 256;
712 /* Move to connecting socket, start sending Connect Requests */
713 sock->state = SS_CONNECTING;
714 sk->sk_state = TCP_SYN_SENT;
716 nr_establish_data_link(sk);
718 nr->state = NR_STATE_1;
720 nr_start_heartbeat(sk);
723 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
729 * A Connect Ack with Choke or timeout or failed routing will go to
732 if (sk->sk_state == TCP_SYN_SENT) {
736 prepare_to_wait(sk_sleep(sk), &wait,
738 if (sk->sk_state != TCP_SYN_SENT)
740 if (!signal_pending(current)) {
749 finish_wait(sk_sleep(sk), &wait);
754 if (sk->sk_state != TCP_ESTABLISHED) {
755 sock->state = SS_UNCONNECTED;
756 err = sock_error(sk); /* Always set at this point */
760 sock->state = SS_CONNECTED;
768 static int nr_accept(struct socket *sock, struct socket *newsock, int flags)
776 if ((sk = sock->sk) == NULL)
780 if (sk->sk_type != SOCK_SEQPACKET) {
785 if (sk->sk_state != TCP_LISTEN) {
791 * The write queue this time is holding sockets ready to use
792 * hooked into the SABM we saved
795 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
796 skb = skb_dequeue(&sk->sk_receive_queue);
800 if (flags & O_NONBLOCK) {
804 if (!signal_pending(current)) {
813 finish_wait(sk_sleep(sk), &wait);
818 sock_graft(newsk, newsock);
820 /* Now attach up the new socket */
822 sk_acceptq_removed(sk);
830 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
831 int *uaddr_len, int peer)
833 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
834 struct sock *sk = sock->sk;
835 struct nr_sock *nr = nr_sk(sk);
837 memset(&sax->fsa_ax25, 0, sizeof(struct sockaddr_ax25));
841 if (sk->sk_state != TCP_ESTABLISHED) {
845 sax->fsa_ax25.sax25_family = AF_NETROM;
846 sax->fsa_ax25.sax25_ndigis = 1;
847 sax->fsa_ax25.sax25_call = nr->user_addr;
848 memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater));
849 sax->fsa_digipeater[0] = nr->dest_addr;
850 *uaddr_len = sizeof(struct full_sockaddr_ax25);
852 sax->fsa_ax25.sax25_family = AF_NETROM;
853 sax->fsa_ax25.sax25_ndigis = 0;
854 sax->fsa_ax25.sax25_call = nr->source_addr;
855 *uaddr_len = sizeof(struct sockaddr_ax25);
862 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
866 struct nr_sock *nr_make;
867 ax25_address *src, *dest, *user;
868 unsigned short circuit_index, circuit_id;
869 unsigned short peer_circuit_index, peer_circuit_id;
870 unsigned short frametype, flags, window, timeout;
873 skb->sk = NULL; /* Initially we don't know who it's for */
876 * skb->data points to the netrom frame start
879 src = (ax25_address *)(skb->data + 0);
880 dest = (ax25_address *)(skb->data + 7);
882 circuit_index = skb->data[15];
883 circuit_id = skb->data[16];
884 peer_circuit_index = skb->data[17];
885 peer_circuit_id = skb->data[18];
886 frametype = skb->data[19] & 0x0F;
887 flags = skb->data[19] & 0xF0;
890 * Check for an incoming IP over NET/ROM frame.
892 if (frametype == NR_PROTOEXT &&
893 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
894 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
895 skb_reset_transport_header(skb);
897 return nr_rx_ip(skb, dev);
901 * Find an existing socket connection, based on circuit ID, if it's
902 * a Connect Request base it on their circuit ID.
904 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
905 * circuit that no longer exists at the other end ...
910 if (circuit_index == 0 && circuit_id == 0) {
911 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
912 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
914 if (frametype == NR_CONNREQ)
915 sk = nr_find_peer(circuit_index, circuit_id, src);
917 sk = nr_find_socket(circuit_index, circuit_id);
921 skb_reset_transport_header(skb);
923 if (frametype == NR_CONNACK && skb->len == 22)
924 nr_sk(sk)->bpqext = 1;
926 nr_sk(sk)->bpqext = 0;
928 ret = nr_process_rx_frame(sk, skb);
934 * Now it should be a CONNREQ.
936 if (frametype != NR_CONNREQ) {
938 * Here it would be nice to be able to send a reset but
939 * NET/ROM doesn't have one. We've tried to extend the protocol
940 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
941 * apparently kills BPQ boxes... :-(
942 * So now we try to follow the established behaviour of
943 * G8PZT's Xrouter which is sending packets with command type 7
944 * as an extension of the protocol.
946 if (sysctl_netrom_reset_circuit &&
947 (frametype != NR_RESET || flags != 0))
948 nr_transmit_reset(skb, 1);
953 sk = nr_find_listener(dest);
955 user = (ax25_address *)(skb->data + 21);
957 if (sk == NULL || sk_acceptq_is_full(sk) ||
958 (make = nr_make_new(sk)) == NULL) {
959 nr_transmit_refusal(skb, 0);
965 window = skb->data[20];
968 make->sk_state = TCP_ESTABLISHED;
970 /* Fill in his circuit details */
971 nr_make = nr_sk(make);
972 nr_make->source_addr = *dest;
973 nr_make->dest_addr = *src;
974 nr_make->user_addr = *user;
976 nr_make->your_index = circuit_index;
977 nr_make->your_id = circuit_id;
980 circuit = nr_find_next_circuit();
983 nr_make->my_index = circuit / 256;
984 nr_make->my_id = circuit % 256;
988 /* Window negotiation */
989 if (window < nr_make->window)
990 nr_make->window = window;
992 /* L4 timeout negotiation */
993 if (skb->len == 37) {
994 timeout = skb->data[36] * 256 + skb->data[35];
995 if (timeout * HZ < nr_make->t1)
996 nr_make->t1 = timeout * HZ;
1002 nr_write_internal(make, NR_CONNACK);
1004 nr_make->condition = 0x00;
1009 nr_make->state = NR_STATE_3;
1010 sk_acceptq_added(sk);
1011 skb_queue_head(&sk->sk_receive_queue, skb);
1013 if (!sock_flag(sk, SOCK_DEAD))
1014 sk->sk_data_ready(sk, skb->len);
1018 nr_insert_socket(make);
1020 nr_start_heartbeat(make);
1021 nr_start_idletimer(make);
1026 static int nr_sendmsg(struct kiocb *iocb, struct socket *sock,
1027 struct msghdr *msg, size_t len)
1029 struct sock *sk = sock->sk;
1030 struct nr_sock *nr = nr_sk(sk);
1031 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name;
1033 struct sockaddr_ax25 sax;
1034 struct sk_buff *skb;
1035 unsigned char *asmptr;
1038 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1042 if (sock_flag(sk, SOCK_ZAPPED)) {
1043 err = -EADDRNOTAVAIL;
1047 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1048 send_sig(SIGPIPE, current, 0);
1053 if (nr->device == NULL) {
1059 if (msg->msg_namelen < sizeof(sax)) {
1064 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1068 if (sax.sax25_family != AF_NETROM) {
1073 if (sk->sk_state != TCP_ESTABLISHED) {
1077 sax.sax25_family = AF_NETROM;
1078 sax.sax25_call = nr->dest_addr;
1081 /* Build a packet - the conventional user limit is 236 bytes. We can
1082 do ludicrously large NetROM frames but must not overflow */
1088 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1090 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1093 skb_reserve(skb, size - len);
1094 skb_reset_transport_header(skb);
1097 * Push down the NET/ROM header
1100 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1102 /* Build a NET/ROM Transport header */
1104 *asmptr++ = nr->your_index;
1105 *asmptr++ = nr->your_id;
1106 *asmptr++ = 0; /* To be filled in later */
1107 *asmptr++ = 0; /* Ditto */
1108 *asmptr++ = NR_INFO;
1111 * Put the data on the end
1115 /* User data follows immediately after the NET/ROM transport header */
1116 if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) {
1122 if (sk->sk_state != TCP_ESTABLISHED) {
1128 nr_output(sk, skb); /* Shove it onto the queue */
1136 static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
1137 struct msghdr *msg, size_t size, int flags)
1139 struct sock *sk = sock->sk;
1140 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
1142 struct sk_buff *skb;
1146 * This works for seqpacket too. The receiver has ordered the queue for
1147 * us! We do one quick check first though
1151 if (sk->sk_state != TCP_ESTABLISHED) {
1156 /* Now we can treat all alike */
1157 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1162 skb_reset_transport_header(skb);
1165 if (copied > size) {
1167 msg->msg_flags |= MSG_TRUNC;
1170 er = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1172 skb_free_datagram(sk, skb);
1178 memset(sax, 0, sizeof(*sax));
1179 sax->sax25_family = AF_NETROM;
1180 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1184 msg->msg_namelen = sizeof(*sax);
1186 skb_free_datagram(sk, skb);
1193 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1195 struct sock *sk = sock->sk;
1196 void __user *argp = (void __user *)arg;
1204 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1208 return put_user(amount, (int __user *)argp);
1212 struct sk_buff *skb;
1216 /* These two are safe on a single CPU system as only user tasks fiddle here */
1217 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1220 return put_user(amount, (int __user *)argp);
1225 ret = sock_get_timestamp(sk, argp);
1231 ret = sock_get_timestampns(sk, argp);
1237 case SIOCGIFDSTADDR:
1238 case SIOCSIFDSTADDR:
1239 case SIOCGIFBRDADDR:
1240 case SIOCSIFBRDADDR:
1241 case SIOCGIFNETMASK:
1242 case SIOCSIFNETMASK:
1250 if (!capable(CAP_NET_ADMIN))
1252 return nr_rt_ioctl(cmd, argp);
1255 return -ENOIOCTLCMD;
1261 #ifdef CONFIG_PROC_FS
1263 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1265 spin_lock_bh(&nr_list_lock);
1266 return seq_hlist_start_head(&nr_list, *pos);
1269 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1271 return seq_hlist_next(v, &nr_list, pos);
1274 static void nr_info_stop(struct seq_file *seq, void *v)
1276 spin_unlock_bh(&nr_list_lock);
1279 static int nr_info_show(struct seq_file *seq, void *v)
1281 struct sock *s = sk_entry(v);
1282 struct net_device *dev;
1284 const char *devname;
1287 if (v == SEQ_START_TOKEN)
1289 "user_addr dest_node src_node dev my your st vs vr va t1 t2 t4 idle n2 wnd Snd-Q Rcv-Q inode\n");
1296 if ((dev = nr->device) == NULL)
1299 devname = dev->name;
1301 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1302 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1304 "%-9s %-3s %02X/%02X %02X/%02X %2d %3d %3d %3d %3lu/%03lu %2lu/%02lu %3lu/%03lu %3lu/%03lu %2d/%02d %3d %5d %5d %ld\n",
1305 ax2asc(buf, &nr->source_addr),
1315 ax25_display_timer(&nr->t1timer) / HZ,
1317 ax25_display_timer(&nr->t2timer) / HZ,
1319 ax25_display_timer(&nr->t4timer) / HZ,
1321 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1322 nr->idle / (60 * HZ),
1326 sk_wmem_alloc_get(s),
1327 sk_rmem_alloc_get(s),
1328 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1335 static const struct seq_operations nr_info_seqops = {
1336 .start = nr_info_start,
1337 .next = nr_info_next,
1338 .stop = nr_info_stop,
1339 .show = nr_info_show,
1342 static int nr_info_open(struct inode *inode, struct file *file)
1344 return seq_open(file, &nr_info_seqops);
1347 static const struct file_operations nr_info_fops = {
1348 .owner = THIS_MODULE,
1349 .open = nr_info_open,
1351 .llseek = seq_lseek,
1352 .release = seq_release,
1354 #endif /* CONFIG_PROC_FS */
1356 static const struct net_proto_family nr_family_ops = {
1357 .family = PF_NETROM,
1358 .create = nr_create,
1359 .owner = THIS_MODULE,
1362 static const struct proto_ops nr_proto_ops = {
1363 .family = PF_NETROM,
1364 .owner = THIS_MODULE,
1365 .release = nr_release,
1367 .connect = nr_connect,
1368 .socketpair = sock_no_socketpair,
1369 .accept = nr_accept,
1370 .getname = nr_getname,
1371 .poll = datagram_poll,
1373 .listen = nr_listen,
1374 .shutdown = sock_no_shutdown,
1375 .setsockopt = nr_setsockopt,
1376 .getsockopt = nr_getsockopt,
1377 .sendmsg = nr_sendmsg,
1378 .recvmsg = nr_recvmsg,
1379 .mmap = sock_no_mmap,
1380 .sendpage = sock_no_sendpage,
1383 static struct notifier_block nr_dev_notifier = {
1384 .notifier_call = nr_device_event,
1387 static struct net_device **dev_nr;
1389 static struct ax25_protocol nr_pid = {
1390 .pid = AX25_P_NETROM,
1391 .func = nr_route_frame
1394 static struct ax25_linkfail nr_linkfail_notifier = {
1395 .func = nr_link_failed,
1398 static int __init nr_proto_init(void)
1401 int rc = proto_register(&nr_proto, 0);
1406 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1407 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n");
1411 dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL);
1412 if (dev_nr == NULL) {
1413 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n");
1417 for (i = 0; i < nr_ndevs; i++) {
1418 char name[IFNAMSIZ];
1419 struct net_device *dev;
1421 sprintf(name, "nr%d", i);
1422 dev = alloc_netdev(0, name, nr_setup);
1424 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n");
1429 if (register_netdev(dev)) {
1430 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n");
1434 nr_set_lockdep_key(dev);
1438 if (sock_register(&nr_family_ops)) {
1439 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n");
1443 register_netdevice_notifier(&nr_dev_notifier);
1445 ax25_register_pid(&nr_pid);
1446 ax25_linkfail_register(&nr_linkfail_notifier);
1448 #ifdef CONFIG_SYSCTL
1449 nr_register_sysctl();
1454 proc_create("nr", S_IRUGO, init_net.proc_net, &nr_info_fops);
1455 proc_create("nr_neigh", S_IRUGO, init_net.proc_net, &nr_neigh_fops);
1456 proc_create("nr_nodes", S_IRUGO, init_net.proc_net, &nr_nodes_fops);
1461 unregister_netdev(dev_nr[i]);
1462 free_netdev(dev_nr[i]);
1465 proto_unregister(&nr_proto);
1470 module_init(nr_proto_init);
1472 module_param(nr_ndevs, int, 0);
1473 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1475 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1476 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1477 MODULE_LICENSE("GPL");
1478 MODULE_ALIAS_NETPROTO(PF_NETROM);
1480 static void __exit nr_exit(void)
1484 remove_proc_entry("nr", init_net.proc_net);
1485 remove_proc_entry("nr_neigh", init_net.proc_net);
1486 remove_proc_entry("nr_nodes", init_net.proc_net);
1487 nr_loopback_clear();
1491 #ifdef CONFIG_SYSCTL
1492 nr_unregister_sysctl();
1495 ax25_linkfail_release(&nr_linkfail_notifier);
1496 ax25_protocol_release(AX25_P_NETROM);
1498 unregister_netdevice_notifier(&nr_dev_notifier);
1500 sock_unregister(PF_NETROM);
1502 for (i = 0; i < nr_ndevs; i++) {
1503 struct net_device *dev = dev_nr[i];
1505 unregister_netdev(dev);
1511 proto_unregister(&nr_proto);
1513 module_exit(nr_exit);