1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
5 * Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
6 * Copyright Darryl Miles G7LED (dlm@g7led.demon.co.uk)
8 #include <linux/module.h>
9 #include <linux/moduleparam.h>
10 #include <linux/capability.h>
11 #include <linux/errno.h>
12 #include <linux/types.h>
13 #include <linux/socket.h>
15 #include <linux/slab.h>
16 #include <linux/kernel.h>
17 #include <linux/sched/signal.h>
18 #include <linux/timer.h>
19 #include <linux/string.h>
20 #include <linux/sockios.h>
21 #include <linux/net.h>
22 #include <linux/stat.h>
24 #include <linux/inet.h>
25 #include <linux/netdevice.h>
26 #include <linux/if_arp.h>
27 #include <linux/skbuff.h>
28 #include <net/net_namespace.h>
30 #include <linux/uaccess.h>
31 #include <linux/fcntl.h>
32 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
34 #include <linux/interrupt.h>
35 #include <linux/notifier.h>
36 #include <net/netrom.h>
37 #include <linux/proc_fs.h>
38 #include <linux/seq_file.h>
40 #include <net/tcp_states.h>
42 #include <linux/init.h>
44 static int nr_ndevs = 4;
46 int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL;
47 int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS;
48 int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL;
49 int sysctl_netrom_transport_timeout = NR_DEFAULT_T1;
50 int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2;
51 int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2;
52 int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4;
53 int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW;
54 int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE;
55 int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING;
56 int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS;
57 int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET;
59 static unsigned short circuit = 0x101;
61 static HLIST_HEAD(nr_list);
62 static DEFINE_SPINLOCK(nr_list_lock);
64 static const struct proto_ops nr_proto_ops;
67 * NETROM network devices are virtual network devices encapsulating NETROM
68 * frames into AX.25 which will be sent through an AX.25 device, so form a
69 * special "super class" of normal net devices; split their locks off into a
70 * separate class since they always nest.
72 static struct lock_class_key nr_netdev_xmit_lock_key;
73 static struct lock_class_key nr_netdev_addr_lock_key;
75 static void nr_set_lockdep_one(struct net_device *dev,
76 struct netdev_queue *txq,
79 lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key);
82 static void nr_set_lockdep_key(struct net_device *dev)
84 lockdep_set_class(&dev->addr_list_lock, &nr_netdev_addr_lock_key);
85 netdev_for_each_tx_queue(dev, nr_set_lockdep_one, NULL);
89 * Socket removal during an interrupt is now safe.
91 static void nr_remove_socket(struct sock *sk)
93 spin_lock_bh(&nr_list_lock);
95 spin_unlock_bh(&nr_list_lock);
99 * Kill all bound sockets on a dropped device.
101 static void nr_kill_by_device(struct net_device *dev)
105 spin_lock_bh(&nr_list_lock);
106 sk_for_each(s, &nr_list)
107 if (nr_sk(s)->device == dev)
108 nr_disconnect(s, ENETUNREACH);
109 spin_unlock_bh(&nr_list_lock);
113 * Handle device status changes.
115 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
117 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
119 if (!net_eq(dev_net(dev), &init_net))
122 if (event != NETDEV_DOWN)
125 nr_kill_by_device(dev);
126 nr_rt_device_down(dev);
132 * Add a socket to the bound sockets list.
134 static void nr_insert_socket(struct sock *sk)
136 spin_lock_bh(&nr_list_lock);
137 sk_add_node(sk, &nr_list);
138 spin_unlock_bh(&nr_list_lock);
142 * Find a socket that wants to accept the Connect Request we just
145 static struct sock *nr_find_listener(ax25_address *addr)
149 spin_lock_bh(&nr_list_lock);
150 sk_for_each(s, &nr_list)
151 if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
152 s->sk_state == TCP_LISTEN) {
158 spin_unlock_bh(&nr_list_lock);
163 * Find a connected NET/ROM socket given my circuit IDs.
165 static struct sock *nr_find_socket(unsigned char index, unsigned char id)
169 spin_lock_bh(&nr_list_lock);
170 sk_for_each(s, &nr_list) {
171 struct nr_sock *nr = nr_sk(s);
173 if (nr->my_index == index && nr->my_id == id) {
180 spin_unlock_bh(&nr_list_lock);
185 * Find a connected NET/ROM socket given their circuit IDs.
187 static struct sock *nr_find_peer(unsigned char index, unsigned char id,
192 spin_lock_bh(&nr_list_lock);
193 sk_for_each(s, &nr_list) {
194 struct nr_sock *nr = nr_sk(s);
196 if (nr->your_index == index && nr->your_id == id &&
197 !ax25cmp(&nr->dest_addr, dest)) {
204 spin_unlock_bh(&nr_list_lock);
209 * Find next free circuit ID.
211 static unsigned short nr_find_next_circuit(void)
213 unsigned short id = circuit;
221 if (i != 0 && j != 0) {
222 if ((sk=nr_find_socket(i, j)) == NULL)
236 void nr_destroy_socket(struct sock *);
239 * Handler for deferred kills.
241 static void nr_destroy_timer(struct timer_list *t)
243 struct sock *sk = from_timer(sk, t, sk_timer);
246 nr_destroy_socket(sk);
252 * This is called from user mode and the timers. Thus it protects itself
253 * against interrupt users but doesn't worry about being called during
254 * work. Once it is removed from the queue no interrupt or bottom half
255 * will touch it and we are (fairly 8-) ) safe.
257 void nr_destroy_socket(struct sock *sk)
261 nr_remove_socket(sk);
263 nr_stop_heartbeat(sk);
267 nr_stop_idletimer(sk);
269 nr_clear_queues(sk); /* Flush the queues */
271 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
272 if (skb->sk != sk) { /* A pending connection */
273 /* Queue the unaccepted socket for death */
274 sock_set_flag(skb->sk, SOCK_DEAD);
275 nr_start_heartbeat(skb->sk);
276 nr_sk(skb->sk)->state = NR_STATE_0;
282 if (sk_has_allocations(sk)) {
283 /* Defer: outstanding buffers */
284 sk->sk_timer.function = nr_destroy_timer;
285 sk->sk_timer.expires = jiffies + 2 * HZ;
286 add_timer(&sk->sk_timer);
292 * Handling for system calls applied via the various interfaces to a
293 * NET/ROM socket object.
296 static int nr_setsockopt(struct socket *sock, int level, int optname,
297 sockptr_t optval, unsigned int optlen)
299 struct sock *sk = sock->sk;
300 struct nr_sock *nr = nr_sk(sk);
303 if (level != SOL_NETROM)
306 if (optlen < sizeof(unsigned int))
309 if (copy_from_sockptr(&opt, optval, sizeof(opt)))
314 if (opt < 1 || opt > UINT_MAX / HZ)
320 if (opt < 1 || opt > UINT_MAX / HZ)
326 if (opt < 1 || opt > 31)
332 if (opt < 1 || opt > UINT_MAX / HZ)
338 if (opt > UINT_MAX / (60 * HZ))
340 nr->idle = opt * 60 * HZ;
348 static int nr_getsockopt(struct socket *sock, int level, int optname,
349 char __user *optval, int __user *optlen)
351 struct sock *sk = sock->sk;
352 struct nr_sock *nr = nr_sk(sk);
356 if (level != SOL_NETROM)
359 if (get_user(len, optlen))
383 val = nr->idle / (60 * HZ);
390 len = min_t(unsigned int, len, sizeof(int));
392 if (put_user(len, optlen))
395 return copy_to_user(optval, &val, len) ? -EFAULT : 0;
398 static int nr_listen(struct socket *sock, int backlog)
400 struct sock *sk = sock->sk;
403 if (sock->state != SS_UNCONNECTED) {
408 if (sk->sk_state != TCP_LISTEN) {
409 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
410 sk->sk_max_ack_backlog = backlog;
411 sk->sk_state = TCP_LISTEN;
420 static struct proto nr_proto = {
422 .owner = THIS_MODULE,
423 .obj_size = sizeof(struct nr_sock),
426 static int nr_create(struct net *net, struct socket *sock, int protocol,
432 if (!net_eq(net, &init_net))
433 return -EAFNOSUPPORT;
435 if (sock->type != SOCK_SEQPACKET || protocol != 0)
436 return -ESOCKTNOSUPPORT;
438 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto, kern);
444 sock_init_data(sock, sk);
446 sock->ops = &nr_proto_ops;
447 sk->sk_protocol = protocol;
449 skb_queue_head_init(&nr->ack_queue);
450 skb_queue_head_init(&nr->reseq_queue);
451 skb_queue_head_init(&nr->frag_queue);
456 msecs_to_jiffies(sysctl_netrom_transport_timeout);
458 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
460 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
462 msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
464 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
465 nr->window = sysctl_netrom_transport_requested_window_size;
468 nr->state = NR_STATE_0;
473 static struct sock *nr_make_new(struct sock *osk)
476 struct nr_sock *nr, *onr;
478 if (osk->sk_type != SOCK_SEQPACKET)
481 sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot, 0);
487 sock_init_data(NULL, sk);
489 sk->sk_type = osk->sk_type;
490 sk->sk_priority = osk->sk_priority;
491 sk->sk_protocol = osk->sk_protocol;
492 sk->sk_rcvbuf = osk->sk_rcvbuf;
493 sk->sk_sndbuf = osk->sk_sndbuf;
494 sk->sk_state = TCP_ESTABLISHED;
495 sock_copy_flags(sk, osk);
497 skb_queue_head_init(&nr->ack_queue);
498 skb_queue_head_init(&nr->reseq_queue);
499 skb_queue_head_init(&nr->frag_queue);
509 nr->idle = onr->idle;
510 nr->window = onr->window;
512 nr->device = onr->device;
513 nr->bpqext = onr->bpqext;
518 static int nr_release(struct socket *sock)
520 struct sock *sk = sock->sk;
523 if (sk == NULL) return 0;
534 nr_disconnect(sk, 0);
535 nr_destroy_socket(sk);
541 nr_write_internal(sk, NR_DISCREQ);
542 nr_start_t1timer(sk);
545 nr_stop_idletimer(sk);
546 nr->state = NR_STATE_2;
547 sk->sk_state = TCP_CLOSE;
548 sk->sk_shutdown |= SEND_SHUTDOWN;
549 sk->sk_state_change(sk);
550 sock_set_flag(sk, SOCK_DESTROY);
564 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
566 struct sock *sk = sock->sk;
567 struct nr_sock *nr = nr_sk(sk);
568 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
569 struct net_device *dev;
570 ax25_uid_assoc *user;
571 ax25_address *source;
574 if (!sock_flag(sk, SOCK_ZAPPED)) {
578 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
582 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
586 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
590 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
592 return -EADDRNOTAVAIL;
596 * Only the super user can set an arbitrary user callsign.
598 if (addr->fsa_ax25.sax25_ndigis == 1) {
599 if (!capable(CAP_NET_BIND_SERVICE)) {
604 nr->user_addr = addr->fsa_digipeater[0];
605 nr->source_addr = addr->fsa_ax25.sax25_call;
607 source = &addr->fsa_ax25.sax25_call;
609 user = ax25_findbyuid(current_euid());
611 nr->user_addr = user->call;
614 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
619 nr->user_addr = *source;
622 nr->source_addr = *source;
626 nr_insert_socket(sk);
628 sock_reset_flag(sk, SOCK_ZAPPED);
635 static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
636 int addr_len, int flags)
638 struct sock *sk = sock->sk;
639 struct nr_sock *nr = nr_sk(sk);
640 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
641 const ax25_address *source = NULL;
642 ax25_uid_assoc *user;
643 struct net_device *dev;
647 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
648 sock->state = SS_CONNECTED;
649 goto out_release; /* Connect completed during a ERESTARTSYS event */
652 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
653 sock->state = SS_UNCONNECTED;
658 if (sk->sk_state == TCP_ESTABLISHED) {
659 err = -EISCONN; /* No reconnect on a seqpacket socket */
663 if (sock->state == SS_CONNECTING) {
668 sk->sk_state = TCP_CLOSE;
669 sock->state = SS_UNCONNECTED;
671 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
675 if (addr->sax25_family != AF_NETROM) {
679 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */
680 sock_reset_flag(sk, SOCK_ZAPPED);
682 if ((dev = nr_dev_first()) == NULL) {
686 source = (const ax25_address *)dev->dev_addr;
688 user = ax25_findbyuid(current_euid());
690 nr->user_addr = user->call;
693 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
698 nr->user_addr = *source;
701 nr->source_addr = *source;
705 nr_insert_socket(sk); /* Finish the bind */
708 nr->dest_addr = addr->sax25_call;
711 circuit = nr_find_next_circuit();
714 nr->my_index = circuit / 256;
715 nr->my_id = circuit % 256;
719 /* Move to connecting socket, start sending Connect Requests */
720 sock->state = SS_CONNECTING;
721 sk->sk_state = TCP_SYN_SENT;
723 nr_establish_data_link(sk);
725 nr->state = NR_STATE_1;
727 nr_start_heartbeat(sk);
730 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
736 * A Connect Ack with Choke or timeout or failed routing will go to
739 if (sk->sk_state == TCP_SYN_SENT) {
743 prepare_to_wait(sk_sleep(sk), &wait,
745 if (sk->sk_state != TCP_SYN_SENT)
747 if (!signal_pending(current)) {
756 finish_wait(sk_sleep(sk), &wait);
761 if (sk->sk_state != TCP_ESTABLISHED) {
762 sock->state = SS_UNCONNECTED;
763 err = sock_error(sk); /* Always set at this point */
767 sock->state = SS_CONNECTED;
775 static int nr_accept(struct socket *sock, struct socket *newsock, int flags,
784 if ((sk = sock->sk) == NULL)
788 if (sk->sk_type != SOCK_SEQPACKET) {
793 if (sk->sk_state != TCP_LISTEN) {
799 * The write queue this time is holding sockets ready to use
800 * hooked into the SABM we saved
803 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
804 skb = skb_dequeue(&sk->sk_receive_queue);
808 if (flags & O_NONBLOCK) {
812 if (!signal_pending(current)) {
821 finish_wait(sk_sleep(sk), &wait);
826 sock_graft(newsk, newsock);
828 /* Now attach up the new socket */
830 sk_acceptq_removed(sk);
838 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
841 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
842 struct sock *sk = sock->sk;
843 struct nr_sock *nr = nr_sk(sk);
846 memset(&sax->fsa_ax25, 0, sizeof(struct sockaddr_ax25));
850 if (sk->sk_state != TCP_ESTABLISHED) {
854 sax->fsa_ax25.sax25_family = AF_NETROM;
855 sax->fsa_ax25.sax25_ndigis = 1;
856 sax->fsa_ax25.sax25_call = nr->user_addr;
857 memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater));
858 sax->fsa_digipeater[0] = nr->dest_addr;
859 uaddr_len = sizeof(struct full_sockaddr_ax25);
861 sax->fsa_ax25.sax25_family = AF_NETROM;
862 sax->fsa_ax25.sax25_ndigis = 0;
863 sax->fsa_ax25.sax25_call = nr->source_addr;
864 uaddr_len = sizeof(struct sockaddr_ax25);
871 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
875 struct nr_sock *nr_make;
876 ax25_address *src, *dest, *user;
877 unsigned short circuit_index, circuit_id;
878 unsigned short peer_circuit_index, peer_circuit_id;
879 unsigned short frametype, flags, window, timeout;
885 * skb->data points to the netrom frame start
888 src = (ax25_address *)(skb->data + 0);
889 dest = (ax25_address *)(skb->data + 7);
891 circuit_index = skb->data[15];
892 circuit_id = skb->data[16];
893 peer_circuit_index = skb->data[17];
894 peer_circuit_id = skb->data[18];
895 frametype = skb->data[19] & 0x0F;
896 flags = skb->data[19] & 0xF0;
899 * Check for an incoming IP over NET/ROM frame.
901 if (frametype == NR_PROTOEXT &&
902 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
903 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
904 skb_reset_transport_header(skb);
906 return nr_rx_ip(skb, dev);
910 * Find an existing socket connection, based on circuit ID, if it's
911 * a Connect Request base it on their circuit ID.
913 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
914 * circuit that no longer exists at the other end ...
919 if (circuit_index == 0 && circuit_id == 0) {
920 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
921 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
923 if (frametype == NR_CONNREQ)
924 sk = nr_find_peer(circuit_index, circuit_id, src);
926 sk = nr_find_socket(circuit_index, circuit_id);
931 skb_reset_transport_header(skb);
933 if (frametype == NR_CONNACK && skb->len == 22)
934 nr_sk(sk)->bpqext = 1;
936 nr_sk(sk)->bpqext = 0;
938 ret = nr_process_rx_frame(sk, skb);
945 * Now it should be a CONNREQ.
947 if (frametype != NR_CONNREQ) {
949 * Here it would be nice to be able to send a reset but
950 * NET/ROM doesn't have one. We've tried to extend the protocol
951 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
952 * apparently kills BPQ boxes... :-(
953 * So now we try to follow the established behaviour of
954 * G8PZT's Xrouter which is sending packets with command type 7
955 * as an extension of the protocol.
957 if (sysctl_netrom_reset_circuit &&
958 (frametype != NR_RESET || flags != 0))
959 nr_transmit_reset(skb, 1);
964 sk = nr_find_listener(dest);
966 user = (ax25_address *)(skb->data + 21);
968 if (sk == NULL || sk_acceptq_is_full(sk) ||
969 (make = nr_make_new(sk)) == NULL) {
970 nr_transmit_refusal(skb, 0);
978 window = skb->data[20];
982 skb->destructor = sock_efree;
983 make->sk_state = TCP_ESTABLISHED;
985 /* Fill in his circuit details */
986 nr_make = nr_sk(make);
987 nr_make->source_addr = *dest;
988 nr_make->dest_addr = *src;
989 nr_make->user_addr = *user;
991 nr_make->your_index = circuit_index;
992 nr_make->your_id = circuit_id;
995 circuit = nr_find_next_circuit();
998 nr_make->my_index = circuit / 256;
999 nr_make->my_id = circuit % 256;
1003 /* Window negotiation */
1004 if (window < nr_make->window)
1005 nr_make->window = window;
1007 /* L4 timeout negotiation */
1008 if (skb->len == 37) {
1009 timeout = skb->data[36] * 256 + skb->data[35];
1010 if (timeout * HZ < nr_make->t1)
1011 nr_make->t1 = timeout * HZ;
1012 nr_make->bpqext = 1;
1014 nr_make->bpqext = 0;
1017 nr_write_internal(make, NR_CONNACK);
1019 nr_make->condition = 0x00;
1024 nr_make->state = NR_STATE_3;
1025 sk_acceptq_added(sk);
1026 skb_queue_head(&sk->sk_receive_queue, skb);
1028 if (!sock_flag(sk, SOCK_DEAD))
1029 sk->sk_data_ready(sk);
1034 nr_insert_socket(make);
1036 nr_start_heartbeat(make);
1037 nr_start_idletimer(make);
1042 static int nr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1044 struct sock *sk = sock->sk;
1045 struct nr_sock *nr = nr_sk(sk);
1046 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
1048 struct sockaddr_ax25 sax;
1049 struct sk_buff *skb;
1050 unsigned char *asmptr;
1053 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1057 if (sock_flag(sk, SOCK_ZAPPED)) {
1058 err = -EADDRNOTAVAIL;
1062 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1063 send_sig(SIGPIPE, current, 0);
1068 if (nr->device == NULL) {
1074 if (msg->msg_namelen < sizeof(sax)) {
1079 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1083 if (sax.sax25_family != AF_NETROM) {
1088 if (sk->sk_state != TCP_ESTABLISHED) {
1092 sax.sax25_family = AF_NETROM;
1093 sax.sax25_call = nr->dest_addr;
1096 /* Build a packet - the conventional user limit is 236 bytes. We can
1097 do ludicrously large NetROM frames but must not overflow */
1103 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1105 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1108 skb_reserve(skb, size - len);
1109 skb_reset_transport_header(skb);
1112 * Push down the NET/ROM header
1115 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1117 /* Build a NET/ROM Transport header */
1119 *asmptr++ = nr->your_index;
1120 *asmptr++ = nr->your_id;
1121 *asmptr++ = 0; /* To be filled in later */
1122 *asmptr++ = 0; /* Ditto */
1123 *asmptr++ = NR_INFO;
1126 * Put the data on the end
1130 /* User data follows immediately after the NET/ROM transport header */
1131 if (memcpy_from_msg(skb_transport_header(skb), msg, len)) {
1137 if (sk->sk_state != TCP_ESTABLISHED) {
1143 nr_output(sk, skb); /* Shove it onto the queue */
1151 static int nr_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1154 struct sock *sk = sock->sk;
1155 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
1157 struct sk_buff *skb;
1161 * This works for seqpacket too. The receiver has ordered the queue for
1162 * us! We do one quick check first though
1166 if (sk->sk_state != TCP_ESTABLISHED) {
1171 /* Now we can treat all alike */
1172 skb = skb_recv_datagram(sk, flags, &er);
1178 skb_reset_transport_header(skb);
1181 if (copied > size) {
1183 msg->msg_flags |= MSG_TRUNC;
1186 er = skb_copy_datagram_msg(skb, 0, msg, copied);
1188 skb_free_datagram(sk, skb);
1194 memset(sax, 0, sizeof(*sax));
1195 sax->sax25_family = AF_NETROM;
1196 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1198 msg->msg_namelen = sizeof(*sax);
1201 skb_free_datagram(sk, skb);
1208 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1210 struct sock *sk = sock->sk;
1211 void __user *argp = (void __user *)arg;
1218 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1222 return put_user(amount, (int __user *)argp);
1226 struct sk_buff *skb;
1230 /* These two are safe on a single CPU system as only user tasks fiddle here */
1231 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1234 return put_user(amount, (int __user *)argp);
1239 case SIOCGIFDSTADDR:
1240 case SIOCSIFDSTADDR:
1241 case SIOCGIFBRDADDR:
1242 case SIOCSIFBRDADDR:
1243 case SIOCGIFNETMASK:
1244 case SIOCSIFNETMASK:
1252 if (!capable(CAP_NET_ADMIN))
1254 return nr_rt_ioctl(cmd, argp);
1257 return -ENOIOCTLCMD;
1263 #ifdef CONFIG_PROC_FS
1265 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1266 __acquires(&nr_list_lock)
1268 spin_lock_bh(&nr_list_lock);
1269 return seq_hlist_start_head(&nr_list, *pos);
1272 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1274 return seq_hlist_next(v, &nr_list, pos);
1277 static void nr_info_stop(struct seq_file *seq, void *v)
1278 __releases(&nr_list_lock)
1280 spin_unlock_bh(&nr_list_lock);
1283 static int nr_info_show(struct seq_file *seq, void *v)
1285 struct sock *s = sk_entry(v);
1286 struct net_device *dev;
1288 const char *devname;
1291 if (v == SEQ_START_TOKEN)
1293 "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");
1300 if ((dev = nr->device) == NULL)
1303 devname = dev->name;
1305 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1306 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1308 "%-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",
1309 ax2asc(buf, &nr->source_addr),
1319 ax25_display_timer(&nr->t1timer) / HZ,
1321 ax25_display_timer(&nr->t2timer) / HZ,
1323 ax25_display_timer(&nr->t4timer) / HZ,
1325 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1326 nr->idle / (60 * HZ),
1330 sk_wmem_alloc_get(s),
1331 sk_rmem_alloc_get(s),
1332 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1339 static const struct seq_operations nr_info_seqops = {
1340 .start = nr_info_start,
1341 .next = nr_info_next,
1342 .stop = nr_info_stop,
1343 .show = nr_info_show,
1345 #endif /* CONFIG_PROC_FS */
1347 static const struct net_proto_family nr_family_ops = {
1348 .family = PF_NETROM,
1349 .create = nr_create,
1350 .owner = THIS_MODULE,
1353 static const struct proto_ops nr_proto_ops = {
1354 .family = PF_NETROM,
1355 .owner = THIS_MODULE,
1356 .release = nr_release,
1358 .connect = nr_connect,
1359 .socketpair = sock_no_socketpair,
1360 .accept = nr_accept,
1361 .getname = nr_getname,
1362 .poll = datagram_poll,
1364 .gettstamp = sock_gettstamp,
1365 .listen = nr_listen,
1366 .shutdown = sock_no_shutdown,
1367 .setsockopt = nr_setsockopt,
1368 .getsockopt = nr_getsockopt,
1369 .sendmsg = nr_sendmsg,
1370 .recvmsg = nr_recvmsg,
1371 .mmap = sock_no_mmap,
1374 static struct notifier_block nr_dev_notifier = {
1375 .notifier_call = nr_device_event,
1378 static struct net_device **dev_nr;
1380 static struct ax25_protocol nr_pid = {
1381 .pid = AX25_P_NETROM,
1382 .func = nr_route_frame
1385 static struct ax25_linkfail nr_linkfail_notifier = {
1386 .func = nr_link_failed,
1389 static int __init nr_proto_init(void)
1392 int rc = proto_register(&nr_proto, 0);
1397 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1398 pr_err("NET/ROM: %s - nr_ndevs parameter too large\n",
1401 goto unregister_proto;
1404 dev_nr = kcalloc(nr_ndevs, sizeof(struct net_device *), GFP_KERNEL);
1406 pr_err("NET/ROM: %s - unable to allocate device array\n",
1409 goto unregister_proto;
1412 for (i = 0; i < nr_ndevs; i++) {
1413 char name[IFNAMSIZ];
1414 struct net_device *dev;
1416 sprintf(name, "nr%d", i);
1417 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, nr_setup);
1424 rc = register_netdev(dev);
1429 nr_set_lockdep_key(dev);
1433 rc = sock_register(&nr_family_ops);
1437 rc = register_netdevice_notifier(&nr_dev_notifier);
1441 ax25_register_pid(&nr_pid);
1442 ax25_linkfail_register(&nr_linkfail_notifier);
1444 #ifdef CONFIG_SYSCTL
1445 rc = nr_register_sysctl();
1453 if (!proc_create_seq("nr", 0444, init_net.proc_net, &nr_info_seqops))
1455 if (!proc_create_seq("nr_neigh", 0444, init_net.proc_net,
1458 if (!proc_create_seq("nr_nodes", 0444, init_net.proc_net,
1465 remove_proc_entry("nr_neigh", init_net.proc_net);
1467 remove_proc_entry("nr", init_net.proc_net);
1470 nr_loopback_clear();
1473 #ifdef CONFIG_SYSCTL
1474 nr_unregister_sysctl();
1477 ax25_linkfail_release(&nr_linkfail_notifier);
1478 ax25_protocol_release(AX25_P_NETROM);
1479 unregister_netdevice_notifier(&nr_dev_notifier);
1481 sock_unregister(PF_NETROM);
1484 unregister_netdev(dev_nr[i]);
1485 free_netdev(dev_nr[i]);
1489 proto_unregister(&nr_proto);
1493 module_init(nr_proto_init);
1495 module_param(nr_ndevs, int, 0);
1496 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1498 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1499 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1500 MODULE_LICENSE("GPL");
1501 MODULE_ALIAS_NETPROTO(PF_NETROM);
1503 static void __exit nr_exit(void)
1507 remove_proc_entry("nr", init_net.proc_net);
1508 remove_proc_entry("nr_neigh", init_net.proc_net);
1509 remove_proc_entry("nr_nodes", init_net.proc_net);
1510 nr_loopback_clear();
1514 #ifdef CONFIG_SYSCTL
1515 nr_unregister_sysctl();
1518 ax25_linkfail_release(&nr_linkfail_notifier);
1519 ax25_protocol_release(AX25_P_NETROM);
1521 unregister_netdevice_notifier(&nr_dev_notifier);
1523 sock_unregister(PF_NETROM);
1525 for (i = 0; i < nr_ndevs; i++) {
1526 struct net_device *dev = dev_nr[i];
1528 unregister_netdev(dev);
1534 proto_unregister(&nr_proto);
1536 module_exit(nr_exit);