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/signal.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 <linux/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 = netdev_notifier_info_to_dev(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 (sock->state != SS_UNCONNECTED) {
411 if (sk->sk_state != TCP_LISTEN) {
412 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
413 sk->sk_max_ack_backlog = backlog;
414 sk->sk_state = TCP_LISTEN;
423 static struct proto nr_proto = {
425 .owner = THIS_MODULE,
426 .obj_size = sizeof(struct nr_sock),
429 static int nr_create(struct net *net, struct socket *sock, int protocol,
435 if (!net_eq(net, &init_net))
436 return -EAFNOSUPPORT;
438 if (sock->type != SOCK_SEQPACKET || protocol != 0)
439 return -ESOCKTNOSUPPORT;
441 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto, kern);
447 sock_init_data(sock, sk);
449 sock->ops = &nr_proto_ops;
450 sk->sk_protocol = protocol;
452 skb_queue_head_init(&nr->ack_queue);
453 skb_queue_head_init(&nr->reseq_queue);
454 skb_queue_head_init(&nr->frag_queue);
459 msecs_to_jiffies(sysctl_netrom_transport_timeout);
461 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
463 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
465 msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
467 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
468 nr->window = sysctl_netrom_transport_requested_window_size;
471 nr->state = NR_STATE_0;
476 static struct sock *nr_make_new(struct sock *osk)
479 struct nr_sock *nr, *onr;
481 if (osk->sk_type != SOCK_SEQPACKET)
484 sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot, 0);
490 sock_init_data(NULL, sk);
492 sk->sk_type = osk->sk_type;
493 sk->sk_priority = osk->sk_priority;
494 sk->sk_protocol = osk->sk_protocol;
495 sk->sk_rcvbuf = osk->sk_rcvbuf;
496 sk->sk_sndbuf = osk->sk_sndbuf;
497 sk->sk_state = TCP_ESTABLISHED;
498 sock_copy_flags(sk, osk);
500 skb_queue_head_init(&nr->ack_queue);
501 skb_queue_head_init(&nr->reseq_queue);
502 skb_queue_head_init(&nr->frag_queue);
512 nr->idle = onr->idle;
513 nr->window = onr->window;
515 nr->device = onr->device;
516 nr->bpqext = onr->bpqext;
521 static int nr_release(struct socket *sock)
523 struct sock *sk = sock->sk;
526 if (sk == NULL) return 0;
537 nr_disconnect(sk, 0);
538 nr_destroy_socket(sk);
544 nr_write_internal(sk, NR_DISCREQ);
545 nr_start_t1timer(sk);
548 nr_stop_idletimer(sk);
549 nr->state = NR_STATE_2;
550 sk->sk_state = TCP_CLOSE;
551 sk->sk_shutdown |= SEND_SHUTDOWN;
552 sk->sk_state_change(sk);
553 sock_set_flag(sk, SOCK_DESTROY);
567 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
569 struct sock *sk = sock->sk;
570 struct nr_sock *nr = nr_sk(sk);
571 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
572 struct net_device *dev;
573 ax25_uid_assoc *user;
574 ax25_address *source;
577 if (!sock_flag(sk, SOCK_ZAPPED)) {
581 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
585 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
589 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
593 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
595 return -EADDRNOTAVAIL;
599 * Only the super user can set an arbitrary user callsign.
601 if (addr->fsa_ax25.sax25_ndigis == 1) {
602 if (!capable(CAP_NET_BIND_SERVICE)) {
607 nr->user_addr = addr->fsa_digipeater[0];
608 nr->source_addr = addr->fsa_ax25.sax25_call;
610 source = &addr->fsa_ax25.sax25_call;
612 user = ax25_findbyuid(current_euid());
614 nr->user_addr = user->call;
617 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
622 nr->user_addr = *source;
625 nr->source_addr = *source;
629 nr_insert_socket(sk);
631 sock_reset_flag(sk, SOCK_ZAPPED);
638 static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
639 int addr_len, int flags)
641 struct sock *sk = sock->sk;
642 struct nr_sock *nr = nr_sk(sk);
643 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
644 ax25_address *source = NULL;
645 ax25_uid_assoc *user;
646 struct net_device *dev;
650 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
651 sock->state = SS_CONNECTED;
652 goto out_release; /* Connect completed during a ERESTARTSYS event */
655 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
656 sock->state = SS_UNCONNECTED;
661 if (sk->sk_state == TCP_ESTABLISHED) {
662 err = -EISCONN; /* No reconnect on a seqpacket socket */
666 if (sock->state == SS_CONNECTING) {
671 sk->sk_state = TCP_CLOSE;
672 sock->state = SS_UNCONNECTED;
674 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
678 if (addr->sax25_family != AF_NETROM) {
682 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */
683 sock_reset_flag(sk, SOCK_ZAPPED);
685 if ((dev = nr_dev_first()) == NULL) {
689 source = (ax25_address *)dev->dev_addr;
691 user = ax25_findbyuid(current_euid());
693 nr->user_addr = user->call;
696 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
701 nr->user_addr = *source;
704 nr->source_addr = *source;
708 nr_insert_socket(sk); /* Finish the bind */
711 nr->dest_addr = addr->sax25_call;
714 circuit = nr_find_next_circuit();
717 nr->my_index = circuit / 256;
718 nr->my_id = circuit % 256;
722 /* Move to connecting socket, start sending Connect Requests */
723 sock->state = SS_CONNECTING;
724 sk->sk_state = TCP_SYN_SENT;
726 nr_establish_data_link(sk);
728 nr->state = NR_STATE_1;
730 nr_start_heartbeat(sk);
733 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
739 * A Connect Ack with Choke or timeout or failed routing will go to
742 if (sk->sk_state == TCP_SYN_SENT) {
746 prepare_to_wait(sk_sleep(sk), &wait,
748 if (sk->sk_state != TCP_SYN_SENT)
750 if (!signal_pending(current)) {
759 finish_wait(sk_sleep(sk), &wait);
764 if (sk->sk_state != TCP_ESTABLISHED) {
765 sock->state = SS_UNCONNECTED;
766 err = sock_error(sk); /* Always set at this point */
770 sock->state = SS_CONNECTED;
778 static int nr_accept(struct socket *sock, struct socket *newsock, int flags,
787 if ((sk = sock->sk) == NULL)
791 if (sk->sk_type != SOCK_SEQPACKET) {
796 if (sk->sk_state != TCP_LISTEN) {
802 * The write queue this time is holding sockets ready to use
803 * hooked into the SABM we saved
806 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
807 skb = skb_dequeue(&sk->sk_receive_queue);
811 if (flags & O_NONBLOCK) {
815 if (!signal_pending(current)) {
824 finish_wait(sk_sleep(sk), &wait);
829 sock_graft(newsk, newsock);
831 /* Now attach up the new socket */
833 sk_acceptq_removed(sk);
841 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
842 int *uaddr_len, int peer)
844 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
845 struct sock *sk = sock->sk;
846 struct nr_sock *nr = nr_sk(sk);
848 memset(&sax->fsa_ax25, 0, sizeof(struct sockaddr_ax25));
852 if (sk->sk_state != TCP_ESTABLISHED) {
856 sax->fsa_ax25.sax25_family = AF_NETROM;
857 sax->fsa_ax25.sax25_ndigis = 1;
858 sax->fsa_ax25.sax25_call = nr->user_addr;
859 memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater));
860 sax->fsa_digipeater[0] = nr->dest_addr;
861 *uaddr_len = sizeof(struct full_sockaddr_ax25);
863 sax->fsa_ax25.sax25_family = AF_NETROM;
864 sax->fsa_ax25.sax25_ndigis = 0;
865 sax->fsa_ax25.sax25_call = nr->source_addr;
866 *uaddr_len = sizeof(struct sockaddr_ax25);
873 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
877 struct nr_sock *nr_make;
878 ax25_address *src, *dest, *user;
879 unsigned short circuit_index, circuit_id;
880 unsigned short peer_circuit_index, peer_circuit_id;
881 unsigned short frametype, flags, window, timeout;
887 * skb->data points to the netrom frame start
890 src = (ax25_address *)(skb->data + 0);
891 dest = (ax25_address *)(skb->data + 7);
893 circuit_index = skb->data[15];
894 circuit_id = skb->data[16];
895 peer_circuit_index = skb->data[17];
896 peer_circuit_id = skb->data[18];
897 frametype = skb->data[19] & 0x0F;
898 flags = skb->data[19] & 0xF0;
901 * Check for an incoming IP over NET/ROM frame.
903 if (frametype == NR_PROTOEXT &&
904 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
905 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
906 skb_reset_transport_header(skb);
908 return nr_rx_ip(skb, dev);
912 * Find an existing socket connection, based on circuit ID, if it's
913 * a Connect Request base it on their circuit ID.
915 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
916 * circuit that no longer exists at the other end ...
921 if (circuit_index == 0 && circuit_id == 0) {
922 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
923 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
925 if (frametype == NR_CONNREQ)
926 sk = nr_find_peer(circuit_index, circuit_id, src);
928 sk = nr_find_socket(circuit_index, circuit_id);
933 skb_reset_transport_header(skb);
935 if (frametype == NR_CONNACK && skb->len == 22)
936 nr_sk(sk)->bpqext = 1;
938 nr_sk(sk)->bpqext = 0;
940 ret = nr_process_rx_frame(sk, skb);
947 * Now it should be a CONNREQ.
949 if (frametype != NR_CONNREQ) {
951 * Here it would be nice to be able to send a reset but
952 * NET/ROM doesn't have one. We've tried to extend the protocol
953 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
954 * apparently kills BPQ boxes... :-(
955 * So now we try to follow the established behaviour of
956 * G8PZT's Xrouter which is sending packets with command type 7
957 * as an extension of the protocol.
959 if (sysctl_netrom_reset_circuit &&
960 (frametype != NR_RESET || flags != 0))
961 nr_transmit_reset(skb, 1);
966 sk = nr_find_listener(dest);
968 user = (ax25_address *)(skb->data + 21);
970 if (sk == NULL || sk_acceptq_is_full(sk) ||
971 (make = nr_make_new(sk)) == NULL) {
972 nr_transmit_refusal(skb, 0);
980 window = skb->data[20];
984 skb->destructor = sock_efree;
985 make->sk_state = TCP_ESTABLISHED;
987 /* Fill in his circuit details */
988 nr_make = nr_sk(make);
989 nr_make->source_addr = *dest;
990 nr_make->dest_addr = *src;
991 nr_make->user_addr = *user;
993 nr_make->your_index = circuit_index;
994 nr_make->your_id = circuit_id;
997 circuit = nr_find_next_circuit();
1000 nr_make->my_index = circuit / 256;
1001 nr_make->my_id = circuit % 256;
1005 /* Window negotiation */
1006 if (window < nr_make->window)
1007 nr_make->window = window;
1009 /* L4 timeout negotiation */
1010 if (skb->len == 37) {
1011 timeout = skb->data[36] * 256 + skb->data[35];
1012 if (timeout * HZ < nr_make->t1)
1013 nr_make->t1 = timeout * HZ;
1014 nr_make->bpqext = 1;
1016 nr_make->bpqext = 0;
1019 nr_write_internal(make, NR_CONNACK);
1021 nr_make->condition = 0x00;
1026 nr_make->state = NR_STATE_3;
1027 sk_acceptq_added(sk);
1028 skb_queue_head(&sk->sk_receive_queue, skb);
1030 if (!sock_flag(sk, SOCK_DEAD))
1031 sk->sk_data_ready(sk);
1036 nr_insert_socket(make);
1038 nr_start_heartbeat(make);
1039 nr_start_idletimer(make);
1044 static int nr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1046 struct sock *sk = sock->sk;
1047 struct nr_sock *nr = nr_sk(sk);
1048 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
1050 struct sockaddr_ax25 sax;
1051 struct sk_buff *skb;
1052 unsigned char *asmptr;
1055 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1059 if (sock_flag(sk, SOCK_ZAPPED)) {
1060 err = -EADDRNOTAVAIL;
1064 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1065 send_sig(SIGPIPE, current, 0);
1070 if (nr->device == NULL) {
1076 if (msg->msg_namelen < sizeof(sax)) {
1081 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1085 if (sax.sax25_family != AF_NETROM) {
1090 if (sk->sk_state != TCP_ESTABLISHED) {
1094 sax.sax25_family = AF_NETROM;
1095 sax.sax25_call = nr->dest_addr;
1098 /* Build a packet - the conventional user limit is 236 bytes. We can
1099 do ludicrously large NetROM frames but must not overflow */
1105 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1107 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1110 skb_reserve(skb, size - len);
1111 skb_reset_transport_header(skb);
1114 * Push down the NET/ROM header
1117 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1119 /* Build a NET/ROM Transport header */
1121 *asmptr++ = nr->your_index;
1122 *asmptr++ = nr->your_id;
1123 *asmptr++ = 0; /* To be filled in later */
1124 *asmptr++ = 0; /* Ditto */
1125 *asmptr++ = NR_INFO;
1128 * Put the data on the end
1132 /* User data follows immediately after the NET/ROM transport header */
1133 if (memcpy_from_msg(skb_transport_header(skb), msg, len)) {
1139 if (sk->sk_state != TCP_ESTABLISHED) {
1145 nr_output(sk, skb); /* Shove it onto the queue */
1153 static int nr_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1156 struct sock *sk = sock->sk;
1157 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
1159 struct sk_buff *skb;
1163 * This works for seqpacket too. The receiver has ordered the queue for
1164 * us! We do one quick check first though
1168 if (sk->sk_state != TCP_ESTABLISHED) {
1173 /* Now we can treat all alike */
1174 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1179 skb_reset_transport_header(skb);
1182 if (copied > size) {
1184 msg->msg_flags |= MSG_TRUNC;
1187 er = skb_copy_datagram_msg(skb, 0, msg, copied);
1189 skb_free_datagram(sk, skb);
1195 memset(sax, 0, sizeof(*sax));
1196 sax->sax25_family = AF_NETROM;
1197 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1199 msg->msg_namelen = sizeof(*sax);
1202 skb_free_datagram(sk, skb);
1209 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1211 struct sock *sk = sock->sk;
1212 void __user *argp = (void __user *)arg;
1220 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1224 return put_user(amount, (int __user *)argp);
1228 struct sk_buff *skb;
1232 /* These two are safe on a single CPU system as only user tasks fiddle here */
1233 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1236 return put_user(amount, (int __user *)argp);
1241 ret = sock_get_timestamp(sk, argp);
1247 ret = sock_get_timestampns(sk, argp);
1253 case SIOCGIFDSTADDR:
1254 case SIOCSIFDSTADDR:
1255 case SIOCGIFBRDADDR:
1256 case SIOCSIFBRDADDR:
1257 case SIOCGIFNETMASK:
1258 case SIOCSIFNETMASK:
1266 if (!capable(CAP_NET_ADMIN))
1268 return nr_rt_ioctl(cmd, argp);
1271 return -ENOIOCTLCMD;
1277 #ifdef CONFIG_PROC_FS
1279 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1281 spin_lock_bh(&nr_list_lock);
1282 return seq_hlist_start_head(&nr_list, *pos);
1285 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1287 return seq_hlist_next(v, &nr_list, pos);
1290 static void nr_info_stop(struct seq_file *seq, void *v)
1292 spin_unlock_bh(&nr_list_lock);
1295 static int nr_info_show(struct seq_file *seq, void *v)
1297 struct sock *s = sk_entry(v);
1298 struct net_device *dev;
1300 const char *devname;
1303 if (v == SEQ_START_TOKEN)
1305 "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");
1312 if ((dev = nr->device) == NULL)
1315 devname = dev->name;
1317 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1318 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1320 "%-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",
1321 ax2asc(buf, &nr->source_addr),
1331 ax25_display_timer(&nr->t1timer) / HZ,
1333 ax25_display_timer(&nr->t2timer) / HZ,
1335 ax25_display_timer(&nr->t4timer) / HZ,
1337 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1338 nr->idle / (60 * HZ),
1342 sk_wmem_alloc_get(s),
1343 sk_rmem_alloc_get(s),
1344 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1351 static const struct seq_operations nr_info_seqops = {
1352 .start = nr_info_start,
1353 .next = nr_info_next,
1354 .stop = nr_info_stop,
1355 .show = nr_info_show,
1358 static int nr_info_open(struct inode *inode, struct file *file)
1360 return seq_open(file, &nr_info_seqops);
1363 static const struct file_operations nr_info_fops = {
1364 .owner = THIS_MODULE,
1365 .open = nr_info_open,
1367 .llseek = seq_lseek,
1368 .release = seq_release,
1370 #endif /* CONFIG_PROC_FS */
1372 static const struct net_proto_family nr_family_ops = {
1373 .family = PF_NETROM,
1374 .create = nr_create,
1375 .owner = THIS_MODULE,
1378 static const struct proto_ops nr_proto_ops = {
1379 .family = PF_NETROM,
1380 .owner = THIS_MODULE,
1381 .release = nr_release,
1383 .connect = nr_connect,
1384 .socketpair = sock_no_socketpair,
1385 .accept = nr_accept,
1386 .getname = nr_getname,
1387 .poll = datagram_poll,
1389 .listen = nr_listen,
1390 .shutdown = sock_no_shutdown,
1391 .setsockopt = nr_setsockopt,
1392 .getsockopt = nr_getsockopt,
1393 .sendmsg = nr_sendmsg,
1394 .recvmsg = nr_recvmsg,
1395 .mmap = sock_no_mmap,
1396 .sendpage = sock_no_sendpage,
1399 static struct notifier_block nr_dev_notifier = {
1400 .notifier_call = nr_device_event,
1403 static struct net_device **dev_nr;
1405 static struct ax25_protocol nr_pid = {
1406 .pid = AX25_P_NETROM,
1407 .func = nr_route_frame
1410 static struct ax25_linkfail nr_linkfail_notifier = {
1411 .func = nr_link_failed,
1414 static int __init nr_proto_init(void)
1417 int rc = proto_register(&nr_proto, 0);
1422 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1423 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n");
1427 dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL);
1428 if (dev_nr == NULL) {
1429 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n");
1433 for (i = 0; i < nr_ndevs; i++) {
1434 char name[IFNAMSIZ];
1435 struct net_device *dev;
1437 sprintf(name, "nr%d", i);
1438 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, nr_setup);
1440 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n");
1445 if (register_netdev(dev)) {
1446 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n");
1450 nr_set_lockdep_key(dev);
1454 if (sock_register(&nr_family_ops)) {
1455 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n");
1459 register_netdevice_notifier(&nr_dev_notifier);
1461 ax25_register_pid(&nr_pid);
1462 ax25_linkfail_register(&nr_linkfail_notifier);
1464 #ifdef CONFIG_SYSCTL
1465 nr_register_sysctl();
1470 proc_create("nr", S_IRUGO, init_net.proc_net, &nr_info_fops);
1471 proc_create("nr_neigh", S_IRUGO, init_net.proc_net, &nr_neigh_fops);
1472 proc_create("nr_nodes", S_IRUGO, init_net.proc_net, &nr_nodes_fops);
1477 unregister_netdev(dev_nr[i]);
1478 free_netdev(dev_nr[i]);
1481 proto_unregister(&nr_proto);
1486 module_init(nr_proto_init);
1488 module_param(nr_ndevs, int, 0);
1489 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1491 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1492 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1493 MODULE_LICENSE("GPL");
1494 MODULE_ALIAS_NETPROTO(PF_NETROM);
1496 static void __exit nr_exit(void)
1500 remove_proc_entry("nr", init_net.proc_net);
1501 remove_proc_entry("nr_neigh", init_net.proc_net);
1502 remove_proc_entry("nr_nodes", init_net.proc_net);
1503 nr_loopback_clear();
1507 #ifdef CONFIG_SYSCTL
1508 nr_unregister_sysctl();
1511 ax25_linkfail_release(&nr_linkfail_notifier);
1512 ax25_protocol_release(AX25_P_NETROM);
1514 unregister_netdevice_notifier(&nr_dev_notifier);
1516 sock_unregister(PF_NETROM);
1518 for (i = 0; i < nr_ndevs; i++) {
1519 struct net_device *dev = dev_nr[i];
1521 unregister_netdev(dev);
1527 proto_unregister(&nr_proto);
1529 module_exit(nr_exit);