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 char __user *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 (get_user(opt, (unsigned int __user *)optval))
314 if (opt < 1 || opt > ULONG_MAX / HZ)
320 if (opt < 1 || opt > ULONG_MAX / HZ)
326 if (opt < 1 || opt > 31)
332 if (opt < 1 || opt > ULONG_MAX / HZ)
338 if (opt > ULONG_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 (sk->sk_state != TCP_LISTEN) {
404 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
405 sk->sk_max_ack_backlog = backlog;
406 sk->sk_state = TCP_LISTEN;
415 static struct proto nr_proto = {
417 .owner = THIS_MODULE,
418 .obj_size = sizeof(struct nr_sock),
421 static int nr_create(struct net *net, struct socket *sock, int protocol,
427 if (!net_eq(net, &init_net))
428 return -EAFNOSUPPORT;
430 if (sock->type != SOCK_SEQPACKET || protocol != 0)
431 return -ESOCKTNOSUPPORT;
433 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto, kern);
439 sock_init_data(sock, sk);
441 sock->ops = &nr_proto_ops;
442 sk->sk_protocol = protocol;
444 skb_queue_head_init(&nr->ack_queue);
445 skb_queue_head_init(&nr->reseq_queue);
446 skb_queue_head_init(&nr->frag_queue);
451 msecs_to_jiffies(sysctl_netrom_transport_timeout);
453 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
455 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
457 msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
459 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
460 nr->window = sysctl_netrom_transport_requested_window_size;
463 nr->state = NR_STATE_0;
468 static struct sock *nr_make_new(struct sock *osk)
471 struct nr_sock *nr, *onr;
473 if (osk->sk_type != SOCK_SEQPACKET)
476 sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot, 0);
482 sock_init_data(NULL, sk);
484 sk->sk_type = osk->sk_type;
485 sk->sk_priority = osk->sk_priority;
486 sk->sk_protocol = osk->sk_protocol;
487 sk->sk_rcvbuf = osk->sk_rcvbuf;
488 sk->sk_sndbuf = osk->sk_sndbuf;
489 sk->sk_state = TCP_ESTABLISHED;
490 sock_copy_flags(sk, osk);
492 skb_queue_head_init(&nr->ack_queue);
493 skb_queue_head_init(&nr->reseq_queue);
494 skb_queue_head_init(&nr->frag_queue);
504 nr->idle = onr->idle;
505 nr->window = onr->window;
507 nr->device = onr->device;
508 nr->bpqext = onr->bpqext;
513 static int nr_release(struct socket *sock)
515 struct sock *sk = sock->sk;
518 if (sk == NULL) return 0;
529 nr_disconnect(sk, 0);
530 nr_destroy_socket(sk);
536 nr_write_internal(sk, NR_DISCREQ);
537 nr_start_t1timer(sk);
540 nr_stop_idletimer(sk);
541 nr->state = NR_STATE_2;
542 sk->sk_state = TCP_CLOSE;
543 sk->sk_shutdown |= SEND_SHUTDOWN;
544 sk->sk_state_change(sk);
545 sock_set_flag(sk, SOCK_DESTROY);
559 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
561 struct sock *sk = sock->sk;
562 struct nr_sock *nr = nr_sk(sk);
563 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
564 struct net_device *dev;
565 ax25_uid_assoc *user;
566 ax25_address *source;
569 if (!sock_flag(sk, SOCK_ZAPPED)) {
573 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
577 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
581 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
585 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
587 return -EADDRNOTAVAIL;
591 * Only the super user can set an arbitrary user callsign.
593 if (addr->fsa_ax25.sax25_ndigis == 1) {
594 if (!capable(CAP_NET_BIND_SERVICE)) {
599 nr->user_addr = addr->fsa_digipeater[0];
600 nr->source_addr = addr->fsa_ax25.sax25_call;
602 source = &addr->fsa_ax25.sax25_call;
604 user = ax25_findbyuid(current_euid());
606 nr->user_addr = user->call;
609 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
614 nr->user_addr = *source;
617 nr->source_addr = *source;
621 nr_insert_socket(sk);
623 sock_reset_flag(sk, SOCK_ZAPPED);
630 static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
631 int addr_len, int flags)
633 struct sock *sk = sock->sk;
634 struct nr_sock *nr = nr_sk(sk);
635 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
636 ax25_address *source = NULL;
637 ax25_uid_assoc *user;
638 struct net_device *dev;
642 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
643 sock->state = SS_CONNECTED;
644 goto out_release; /* Connect completed during a ERESTARTSYS event */
647 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
648 sock->state = SS_UNCONNECTED;
653 if (sk->sk_state == TCP_ESTABLISHED) {
654 err = -EISCONN; /* No reconnect on a seqpacket socket */
658 sk->sk_state = TCP_CLOSE;
659 sock->state = SS_UNCONNECTED;
661 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
665 if (addr->sax25_family != AF_NETROM) {
669 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */
670 sock_reset_flag(sk, SOCK_ZAPPED);
672 if ((dev = nr_dev_first()) == NULL) {
676 source = (ax25_address *)dev->dev_addr;
678 user = ax25_findbyuid(current_euid());
680 nr->user_addr = user->call;
683 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
688 nr->user_addr = *source;
691 nr->source_addr = *source;
695 nr_insert_socket(sk); /* Finish the bind */
698 nr->dest_addr = addr->sax25_call;
701 circuit = nr_find_next_circuit();
704 nr->my_index = circuit / 256;
705 nr->my_id = circuit % 256;
709 /* Move to connecting socket, start sending Connect Requests */
710 sock->state = SS_CONNECTING;
711 sk->sk_state = TCP_SYN_SENT;
713 nr_establish_data_link(sk);
715 nr->state = NR_STATE_1;
717 nr_start_heartbeat(sk);
720 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
726 * A Connect Ack with Choke or timeout or failed routing will go to
729 if (sk->sk_state == TCP_SYN_SENT) {
733 prepare_to_wait(sk_sleep(sk), &wait,
735 if (sk->sk_state != TCP_SYN_SENT)
737 if (!signal_pending(current)) {
746 finish_wait(sk_sleep(sk), &wait);
751 if (sk->sk_state != TCP_ESTABLISHED) {
752 sock->state = SS_UNCONNECTED;
753 err = sock_error(sk); /* Always set at this point */
757 sock->state = SS_CONNECTED;
765 static int nr_accept(struct socket *sock, struct socket *newsock, int flags,
774 if ((sk = sock->sk) == NULL)
778 if (sk->sk_type != SOCK_SEQPACKET) {
783 if (sk->sk_state != TCP_LISTEN) {
789 * The write queue this time is holding sockets ready to use
790 * hooked into the SABM we saved
793 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
794 skb = skb_dequeue(&sk->sk_receive_queue);
798 if (flags & O_NONBLOCK) {
802 if (!signal_pending(current)) {
811 finish_wait(sk_sleep(sk), &wait);
816 sock_graft(newsk, newsock);
818 /* Now attach up the new socket */
820 sk_acceptq_removed(sk);
828 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
831 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
832 struct sock *sk = sock->sk;
833 struct nr_sock *nr = nr_sk(sk);
836 memset(&sax->fsa_ax25, 0, sizeof(struct sockaddr_ax25));
840 if (sk->sk_state != TCP_ESTABLISHED) {
844 sax->fsa_ax25.sax25_family = AF_NETROM;
845 sax->fsa_ax25.sax25_ndigis = 1;
846 sax->fsa_ax25.sax25_call = nr->user_addr;
847 memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater));
848 sax->fsa_digipeater[0] = nr->dest_addr;
849 uaddr_len = sizeof(struct full_sockaddr_ax25);
851 sax->fsa_ax25.sax25_family = AF_NETROM;
852 sax->fsa_ax25.sax25_ndigis = 0;
853 sax->fsa_ax25.sax25_call = nr->source_addr;
854 uaddr_len = sizeof(struct sockaddr_ax25);
861 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
865 struct nr_sock *nr_make;
866 ax25_address *src, *dest, *user;
867 unsigned short circuit_index, circuit_id;
868 unsigned short peer_circuit_index, peer_circuit_id;
869 unsigned short frametype, flags, window, timeout;
875 * skb->data points to the netrom frame start
878 src = (ax25_address *)(skb->data + 0);
879 dest = (ax25_address *)(skb->data + 7);
881 circuit_index = skb->data[15];
882 circuit_id = skb->data[16];
883 peer_circuit_index = skb->data[17];
884 peer_circuit_id = skb->data[18];
885 frametype = skb->data[19] & 0x0F;
886 flags = skb->data[19] & 0xF0;
889 * Check for an incoming IP over NET/ROM frame.
891 if (frametype == NR_PROTOEXT &&
892 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
893 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
894 skb_reset_transport_header(skb);
896 return nr_rx_ip(skb, dev);
900 * Find an existing socket connection, based on circuit ID, if it's
901 * a Connect Request base it on their circuit ID.
903 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
904 * circuit that no longer exists at the other end ...
909 if (circuit_index == 0 && circuit_id == 0) {
910 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
911 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
913 if (frametype == NR_CONNREQ)
914 sk = nr_find_peer(circuit_index, circuit_id, src);
916 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);
935 * Now it should be a CONNREQ.
937 if (frametype != NR_CONNREQ) {
939 * Here it would be nice to be able to send a reset but
940 * NET/ROM doesn't have one. We've tried to extend the protocol
941 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
942 * apparently kills BPQ boxes... :-(
943 * So now we try to follow the established behaviour of
944 * G8PZT's Xrouter which is sending packets with command type 7
945 * as an extension of the protocol.
947 if (sysctl_netrom_reset_circuit &&
948 (frametype != NR_RESET || flags != 0))
949 nr_transmit_reset(skb, 1);
954 sk = nr_find_listener(dest);
956 user = (ax25_address *)(skb->data + 21);
958 if (sk == NULL || sk_acceptq_is_full(sk) ||
959 (make = nr_make_new(sk)) == NULL) {
960 nr_transmit_refusal(skb, 0);
968 window = skb->data[20];
972 skb->destructor = sock_efree;
973 make->sk_state = TCP_ESTABLISHED;
975 /* Fill in his circuit details */
976 nr_make = nr_sk(make);
977 nr_make->source_addr = *dest;
978 nr_make->dest_addr = *src;
979 nr_make->user_addr = *user;
981 nr_make->your_index = circuit_index;
982 nr_make->your_id = circuit_id;
985 circuit = nr_find_next_circuit();
988 nr_make->my_index = circuit / 256;
989 nr_make->my_id = circuit % 256;
993 /* Window negotiation */
994 if (window < nr_make->window)
995 nr_make->window = window;
997 /* L4 timeout negotiation */
998 if (skb->len == 37) {
999 timeout = skb->data[36] * 256 + skb->data[35];
1000 if (timeout * HZ < nr_make->t1)
1001 nr_make->t1 = timeout * HZ;
1002 nr_make->bpqext = 1;
1004 nr_make->bpqext = 0;
1007 nr_write_internal(make, NR_CONNACK);
1009 nr_make->condition = 0x00;
1014 nr_make->state = NR_STATE_3;
1015 sk_acceptq_added(sk);
1016 skb_queue_head(&sk->sk_receive_queue, skb);
1018 if (!sock_flag(sk, SOCK_DEAD))
1019 sk->sk_data_ready(sk);
1024 nr_insert_socket(make);
1026 nr_start_heartbeat(make);
1027 nr_start_idletimer(make);
1032 static int nr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1034 struct sock *sk = sock->sk;
1035 struct nr_sock *nr = nr_sk(sk);
1036 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
1038 struct sockaddr_ax25 sax;
1039 struct sk_buff *skb;
1040 unsigned char *asmptr;
1043 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1047 if (sock_flag(sk, SOCK_ZAPPED)) {
1048 err = -EADDRNOTAVAIL;
1052 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1053 send_sig(SIGPIPE, current, 0);
1058 if (nr->device == NULL) {
1064 if (msg->msg_namelen < sizeof(sax)) {
1069 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1073 if (sax.sax25_family != AF_NETROM) {
1078 if (sk->sk_state != TCP_ESTABLISHED) {
1082 sax.sax25_family = AF_NETROM;
1083 sax.sax25_call = nr->dest_addr;
1086 /* Build a packet - the conventional user limit is 236 bytes. We can
1087 do ludicrously large NetROM frames but must not overflow */
1093 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1095 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1098 skb_reserve(skb, size - len);
1099 skb_reset_transport_header(skb);
1102 * Push down the NET/ROM header
1105 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1107 /* Build a NET/ROM Transport header */
1109 *asmptr++ = nr->your_index;
1110 *asmptr++ = nr->your_id;
1111 *asmptr++ = 0; /* To be filled in later */
1112 *asmptr++ = 0; /* Ditto */
1113 *asmptr++ = NR_INFO;
1116 * Put the data on the end
1120 /* User data follows immediately after the NET/ROM transport header */
1121 if (memcpy_from_msg(skb_transport_header(skb), msg, len)) {
1127 if (sk->sk_state != TCP_ESTABLISHED) {
1133 nr_output(sk, skb); /* Shove it onto the queue */
1141 static int nr_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1144 struct sock *sk = sock->sk;
1145 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
1147 struct sk_buff *skb;
1151 * This works for seqpacket too. The receiver has ordered the queue for
1152 * us! We do one quick check first though
1156 if (sk->sk_state != TCP_ESTABLISHED) {
1161 /* Now we can treat all alike */
1162 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1167 skb_reset_transport_header(skb);
1170 if (copied > size) {
1172 msg->msg_flags |= MSG_TRUNC;
1175 er = skb_copy_datagram_msg(skb, 0, msg, copied);
1177 skb_free_datagram(sk, skb);
1183 memset(sax, 0, sizeof(*sax));
1184 sax->sax25_family = AF_NETROM;
1185 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1187 msg->msg_namelen = sizeof(*sax);
1190 skb_free_datagram(sk, skb);
1197 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1199 struct sock *sk = sock->sk;
1200 void __user *argp = (void __user *)arg;
1207 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1211 return put_user(amount, (int __user *)argp);
1215 struct sk_buff *skb;
1219 /* These two are safe on a single CPU system as only user tasks fiddle here */
1220 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1223 return put_user(amount, (int __user *)argp);
1228 case SIOCGIFDSTADDR:
1229 case SIOCSIFDSTADDR:
1230 case SIOCGIFBRDADDR:
1231 case SIOCSIFBRDADDR:
1232 case SIOCGIFNETMASK:
1233 case SIOCSIFNETMASK:
1241 if (!capable(CAP_NET_ADMIN))
1243 return nr_rt_ioctl(cmd, argp);
1246 return -ENOIOCTLCMD;
1252 #ifdef CONFIG_PROC_FS
1254 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1256 spin_lock_bh(&nr_list_lock);
1257 return seq_hlist_start_head(&nr_list, *pos);
1260 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1262 return seq_hlist_next(v, &nr_list, pos);
1265 static void nr_info_stop(struct seq_file *seq, void *v)
1267 spin_unlock_bh(&nr_list_lock);
1270 static int nr_info_show(struct seq_file *seq, void *v)
1272 struct sock *s = sk_entry(v);
1273 struct net_device *dev;
1275 const char *devname;
1278 if (v == SEQ_START_TOKEN)
1280 "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");
1287 if ((dev = nr->device) == NULL)
1290 devname = dev->name;
1292 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1293 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1295 "%-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",
1296 ax2asc(buf, &nr->source_addr),
1306 ax25_display_timer(&nr->t1timer) / HZ,
1308 ax25_display_timer(&nr->t2timer) / HZ,
1310 ax25_display_timer(&nr->t4timer) / HZ,
1312 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1313 nr->idle / (60 * HZ),
1317 sk_wmem_alloc_get(s),
1318 sk_rmem_alloc_get(s),
1319 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1326 static const struct seq_operations nr_info_seqops = {
1327 .start = nr_info_start,
1328 .next = nr_info_next,
1329 .stop = nr_info_stop,
1330 .show = nr_info_show,
1332 #endif /* CONFIG_PROC_FS */
1334 static const struct net_proto_family nr_family_ops = {
1335 .family = PF_NETROM,
1336 .create = nr_create,
1337 .owner = THIS_MODULE,
1340 static const struct proto_ops nr_proto_ops = {
1341 .family = PF_NETROM,
1342 .owner = THIS_MODULE,
1343 .release = nr_release,
1345 .connect = nr_connect,
1346 .socketpair = sock_no_socketpair,
1347 .accept = nr_accept,
1348 .getname = nr_getname,
1349 .poll = datagram_poll,
1351 .gettstamp = sock_gettstamp,
1352 .listen = nr_listen,
1353 .shutdown = sock_no_shutdown,
1354 .setsockopt = nr_setsockopt,
1355 .getsockopt = nr_getsockopt,
1356 .sendmsg = nr_sendmsg,
1357 .recvmsg = nr_recvmsg,
1358 .mmap = sock_no_mmap,
1359 .sendpage = sock_no_sendpage,
1362 static struct notifier_block nr_dev_notifier = {
1363 .notifier_call = nr_device_event,
1366 static struct net_device **dev_nr;
1368 static struct ax25_protocol nr_pid = {
1369 .pid = AX25_P_NETROM,
1370 .func = nr_route_frame
1373 static struct ax25_linkfail nr_linkfail_notifier = {
1374 .func = nr_link_failed,
1377 static int __init nr_proto_init(void)
1380 int rc = proto_register(&nr_proto, 0);
1385 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1386 pr_err("NET/ROM: %s - nr_ndevs parameter too large\n",
1389 goto unregister_proto;
1392 dev_nr = kcalloc(nr_ndevs, sizeof(struct net_device *), GFP_KERNEL);
1394 pr_err("NET/ROM: %s - unable to allocate device array\n",
1397 goto unregister_proto;
1400 for (i = 0; i < nr_ndevs; i++) {
1401 char name[IFNAMSIZ];
1402 struct net_device *dev;
1404 sprintf(name, "nr%d", i);
1405 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, nr_setup);
1412 rc = register_netdev(dev);
1417 nr_set_lockdep_key(dev);
1421 rc = sock_register(&nr_family_ops);
1425 rc = register_netdevice_notifier(&nr_dev_notifier);
1429 ax25_register_pid(&nr_pid);
1430 ax25_linkfail_register(&nr_linkfail_notifier);
1432 #ifdef CONFIG_SYSCTL
1433 rc = nr_register_sysctl();
1441 if (!proc_create_seq("nr", 0444, init_net.proc_net, &nr_info_seqops))
1443 if (!proc_create_seq("nr_neigh", 0444, init_net.proc_net,
1446 if (!proc_create_seq("nr_nodes", 0444, init_net.proc_net,
1453 remove_proc_entry("nr_neigh", init_net.proc_net);
1455 remove_proc_entry("nr", init_net.proc_net);
1458 nr_loopback_clear();
1461 #ifdef CONFIG_SYSCTL
1462 nr_unregister_sysctl();
1465 ax25_linkfail_release(&nr_linkfail_notifier);
1466 ax25_protocol_release(AX25_P_NETROM);
1467 unregister_netdevice_notifier(&nr_dev_notifier);
1469 sock_unregister(PF_NETROM);
1472 unregister_netdev(dev_nr[i]);
1473 free_netdev(dev_nr[i]);
1477 proto_unregister(&nr_proto);
1481 module_init(nr_proto_init);
1483 module_param(nr_ndevs, int, 0);
1484 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1486 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1487 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1488 MODULE_LICENSE("GPL");
1489 MODULE_ALIAS_NETPROTO(PF_NETROM);
1491 static void __exit nr_exit(void)
1495 remove_proc_entry("nr", init_net.proc_net);
1496 remove_proc_entry("nr_neigh", init_net.proc_net);
1497 remove_proc_entry("nr_nodes", init_net.proc_net);
1498 nr_loopback_clear();
1502 #ifdef CONFIG_SYSCTL
1503 nr_unregister_sysctl();
1506 ax25_linkfail_release(&nr_linkfail_notifier);
1507 ax25_protocol_release(AX25_P_NETROM);
1509 unregister_netdevice_notifier(&nr_dev_notifier);
1511 sock_unregister(PF_NETROM);
1513 for (i = 0; i < nr_ndevs; i++) {
1514 struct net_device *dev = dev_nr[i];
1516 unregister_netdev(dev);
1522 proto_unregister(&nr_proto);
1524 module_exit(nr_exit);