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 sk->sk_state = TCP_CLOSE;
667 sock->state = SS_UNCONNECTED;
669 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
673 if (addr->sax25_family != AF_NETROM) {
677 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */
678 sock_reset_flag(sk, SOCK_ZAPPED);
680 if ((dev = nr_dev_first()) == NULL) {
684 source = (ax25_address *)dev->dev_addr;
686 user = ax25_findbyuid(current_euid());
688 nr->user_addr = user->call;
691 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
696 nr->user_addr = *source;
699 nr->source_addr = *source;
703 nr_insert_socket(sk); /* Finish the bind */
706 nr->dest_addr = addr->sax25_call;
709 circuit = nr_find_next_circuit();
712 nr->my_index = circuit / 256;
713 nr->my_id = circuit % 256;
717 /* Move to connecting socket, start sending Connect Requests */
718 sock->state = SS_CONNECTING;
719 sk->sk_state = TCP_SYN_SENT;
721 nr_establish_data_link(sk);
723 nr->state = NR_STATE_1;
725 nr_start_heartbeat(sk);
728 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
734 * A Connect Ack with Choke or timeout or failed routing will go to
737 if (sk->sk_state == TCP_SYN_SENT) {
741 prepare_to_wait(sk_sleep(sk), &wait,
743 if (sk->sk_state != TCP_SYN_SENT)
745 if (!signal_pending(current)) {
754 finish_wait(sk_sleep(sk), &wait);
759 if (sk->sk_state != TCP_ESTABLISHED) {
760 sock->state = SS_UNCONNECTED;
761 err = sock_error(sk); /* Always set at this point */
765 sock->state = SS_CONNECTED;
773 static int nr_accept(struct socket *sock, struct socket *newsock, int flags,
782 if ((sk = sock->sk) == NULL)
786 if (sk->sk_type != SOCK_SEQPACKET) {
791 if (sk->sk_state != TCP_LISTEN) {
797 * The write queue this time is holding sockets ready to use
798 * hooked into the SABM we saved
801 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
802 skb = skb_dequeue(&sk->sk_receive_queue);
806 if (flags & O_NONBLOCK) {
810 if (!signal_pending(current)) {
819 finish_wait(sk_sleep(sk), &wait);
824 sock_graft(newsk, newsock);
826 /* Now attach up the new socket */
828 sk_acceptq_removed(sk);
836 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
837 int *uaddr_len, int peer)
839 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
840 struct sock *sk = sock->sk;
841 struct nr_sock *nr = nr_sk(sk);
843 memset(&sax->fsa_ax25, 0, sizeof(struct sockaddr_ax25));
847 if (sk->sk_state != TCP_ESTABLISHED) {
851 sax->fsa_ax25.sax25_family = AF_NETROM;
852 sax->fsa_ax25.sax25_ndigis = 1;
853 sax->fsa_ax25.sax25_call = nr->user_addr;
854 memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater));
855 sax->fsa_digipeater[0] = nr->dest_addr;
856 *uaddr_len = sizeof(struct full_sockaddr_ax25);
858 sax->fsa_ax25.sax25_family = AF_NETROM;
859 sax->fsa_ax25.sax25_ndigis = 0;
860 sax->fsa_ax25.sax25_call = nr->source_addr;
861 *uaddr_len = sizeof(struct sockaddr_ax25);
868 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
872 struct nr_sock *nr_make;
873 ax25_address *src, *dest, *user;
874 unsigned short circuit_index, circuit_id;
875 unsigned short peer_circuit_index, peer_circuit_id;
876 unsigned short frametype, flags, window, timeout;
882 * skb->data points to the netrom frame start
885 src = (ax25_address *)(skb->data + 0);
886 dest = (ax25_address *)(skb->data + 7);
888 circuit_index = skb->data[15];
889 circuit_id = skb->data[16];
890 peer_circuit_index = skb->data[17];
891 peer_circuit_id = skb->data[18];
892 frametype = skb->data[19] & 0x0F;
893 flags = skb->data[19] & 0xF0;
896 * Check for an incoming IP over NET/ROM frame.
898 if (frametype == NR_PROTOEXT &&
899 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
900 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
901 skb_reset_transport_header(skb);
903 return nr_rx_ip(skb, dev);
907 * Find an existing socket connection, based on circuit ID, if it's
908 * a Connect Request base it on their circuit ID.
910 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
911 * circuit that no longer exists at the other end ...
916 if (circuit_index == 0 && circuit_id == 0) {
917 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
918 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
920 if (frametype == NR_CONNREQ)
921 sk = nr_find_peer(circuit_index, circuit_id, src);
923 sk = nr_find_socket(circuit_index, circuit_id);
928 skb_reset_transport_header(skb);
930 if (frametype == NR_CONNACK && skb->len == 22)
931 nr_sk(sk)->bpqext = 1;
933 nr_sk(sk)->bpqext = 0;
935 ret = nr_process_rx_frame(sk, skb);
942 * Now it should be a CONNREQ.
944 if (frametype != NR_CONNREQ) {
946 * Here it would be nice to be able to send a reset but
947 * NET/ROM doesn't have one. We've tried to extend the protocol
948 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
949 * apparently kills BPQ boxes... :-(
950 * So now we try to follow the established behaviour of
951 * G8PZT's Xrouter which is sending packets with command type 7
952 * as an extension of the protocol.
954 if (sysctl_netrom_reset_circuit &&
955 (frametype != NR_RESET || flags != 0))
956 nr_transmit_reset(skb, 1);
961 sk = nr_find_listener(dest);
963 user = (ax25_address *)(skb->data + 21);
965 if (sk == NULL || sk_acceptq_is_full(sk) ||
966 (make = nr_make_new(sk)) == NULL) {
967 nr_transmit_refusal(skb, 0);
975 window = skb->data[20];
979 skb->destructor = sock_efree;
980 make->sk_state = TCP_ESTABLISHED;
982 /* Fill in his circuit details */
983 nr_make = nr_sk(make);
984 nr_make->source_addr = *dest;
985 nr_make->dest_addr = *src;
986 nr_make->user_addr = *user;
988 nr_make->your_index = circuit_index;
989 nr_make->your_id = circuit_id;
992 circuit = nr_find_next_circuit();
995 nr_make->my_index = circuit / 256;
996 nr_make->my_id = circuit % 256;
1000 /* Window negotiation */
1001 if (window < nr_make->window)
1002 nr_make->window = window;
1004 /* L4 timeout negotiation */
1005 if (skb->len == 37) {
1006 timeout = skb->data[36] * 256 + skb->data[35];
1007 if (timeout * HZ < nr_make->t1)
1008 nr_make->t1 = timeout * HZ;
1009 nr_make->bpqext = 1;
1011 nr_make->bpqext = 0;
1014 nr_write_internal(make, NR_CONNACK);
1016 nr_make->condition = 0x00;
1021 nr_make->state = NR_STATE_3;
1022 sk_acceptq_added(sk);
1023 skb_queue_head(&sk->sk_receive_queue, skb);
1025 if (!sock_flag(sk, SOCK_DEAD))
1026 sk->sk_data_ready(sk);
1031 nr_insert_socket(make);
1033 nr_start_heartbeat(make);
1034 nr_start_idletimer(make);
1039 static int nr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1041 struct sock *sk = sock->sk;
1042 struct nr_sock *nr = nr_sk(sk);
1043 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
1045 struct sockaddr_ax25 sax;
1046 struct sk_buff *skb;
1047 unsigned char *asmptr;
1050 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1054 if (sock_flag(sk, SOCK_ZAPPED)) {
1055 err = -EADDRNOTAVAIL;
1059 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1060 send_sig(SIGPIPE, current, 0);
1065 if (nr->device == NULL) {
1071 if (msg->msg_namelen < sizeof(sax)) {
1076 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1080 if (sax.sax25_family != AF_NETROM) {
1085 if (sk->sk_state != TCP_ESTABLISHED) {
1089 sax.sax25_family = AF_NETROM;
1090 sax.sax25_call = nr->dest_addr;
1093 /* Build a packet - the conventional user limit is 236 bytes. We can
1094 do ludicrously large NetROM frames but must not overflow */
1100 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1102 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1105 skb_reserve(skb, size - len);
1106 skb_reset_transport_header(skb);
1109 * Push down the NET/ROM header
1112 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1114 /* Build a NET/ROM Transport header */
1116 *asmptr++ = nr->your_index;
1117 *asmptr++ = nr->your_id;
1118 *asmptr++ = 0; /* To be filled in later */
1119 *asmptr++ = 0; /* Ditto */
1120 *asmptr++ = NR_INFO;
1123 * Put the data on the end
1127 /* User data follows immediately after the NET/ROM transport header */
1128 if (memcpy_from_msg(skb_transport_header(skb), msg, len)) {
1134 if (sk->sk_state != TCP_ESTABLISHED) {
1140 nr_output(sk, skb); /* Shove it onto the queue */
1148 static int nr_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1151 struct sock *sk = sock->sk;
1152 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
1154 struct sk_buff *skb;
1158 * This works for seqpacket too. The receiver has ordered the queue for
1159 * us! We do one quick check first though
1163 if (sk->sk_state != TCP_ESTABLISHED) {
1168 /* Now we can treat all alike */
1169 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1174 skb_reset_transport_header(skb);
1177 if (copied > size) {
1179 msg->msg_flags |= MSG_TRUNC;
1182 er = skb_copy_datagram_msg(skb, 0, msg, copied);
1184 skb_free_datagram(sk, skb);
1190 memset(sax, 0, sizeof(*sax));
1191 sax->sax25_family = AF_NETROM;
1192 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1194 msg->msg_namelen = sizeof(*sax);
1197 skb_free_datagram(sk, skb);
1204 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1206 struct sock *sk = sock->sk;
1207 void __user *argp = (void __user *)arg;
1215 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1219 return put_user(amount, (int __user *)argp);
1223 struct sk_buff *skb;
1227 /* These two are safe on a single CPU system as only user tasks fiddle here */
1228 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1231 return put_user(amount, (int __user *)argp);
1236 ret = sock_get_timestamp(sk, argp);
1242 ret = sock_get_timestampns(sk, argp);
1248 case SIOCGIFDSTADDR:
1249 case SIOCSIFDSTADDR:
1250 case SIOCGIFBRDADDR:
1251 case SIOCSIFBRDADDR:
1252 case SIOCGIFNETMASK:
1253 case SIOCSIFNETMASK:
1261 if (!capable(CAP_NET_ADMIN))
1263 return nr_rt_ioctl(cmd, argp);
1266 return -ENOIOCTLCMD;
1272 #ifdef CONFIG_PROC_FS
1274 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1276 spin_lock_bh(&nr_list_lock);
1277 return seq_hlist_start_head(&nr_list, *pos);
1280 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1282 return seq_hlist_next(v, &nr_list, pos);
1285 static void nr_info_stop(struct seq_file *seq, void *v)
1287 spin_unlock_bh(&nr_list_lock);
1290 static int nr_info_show(struct seq_file *seq, void *v)
1292 struct sock *s = sk_entry(v);
1293 struct net_device *dev;
1295 const char *devname;
1298 if (v == SEQ_START_TOKEN)
1300 "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");
1307 if ((dev = nr->device) == NULL)
1310 devname = dev->name;
1312 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1313 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1315 "%-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",
1316 ax2asc(buf, &nr->source_addr),
1326 ax25_display_timer(&nr->t1timer) / HZ,
1328 ax25_display_timer(&nr->t2timer) / HZ,
1330 ax25_display_timer(&nr->t4timer) / HZ,
1332 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1333 nr->idle / (60 * HZ),
1337 sk_wmem_alloc_get(s),
1338 sk_rmem_alloc_get(s),
1339 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1346 static const struct seq_operations nr_info_seqops = {
1347 .start = nr_info_start,
1348 .next = nr_info_next,
1349 .stop = nr_info_stop,
1350 .show = nr_info_show,
1353 static int nr_info_open(struct inode *inode, struct file *file)
1355 return seq_open(file, &nr_info_seqops);
1358 static const struct file_operations nr_info_fops = {
1359 .owner = THIS_MODULE,
1360 .open = nr_info_open,
1362 .llseek = seq_lseek,
1363 .release = seq_release,
1365 #endif /* CONFIG_PROC_FS */
1367 static const struct net_proto_family nr_family_ops = {
1368 .family = PF_NETROM,
1369 .create = nr_create,
1370 .owner = THIS_MODULE,
1373 static const struct proto_ops nr_proto_ops = {
1374 .family = PF_NETROM,
1375 .owner = THIS_MODULE,
1376 .release = nr_release,
1378 .connect = nr_connect,
1379 .socketpair = sock_no_socketpair,
1380 .accept = nr_accept,
1381 .getname = nr_getname,
1382 .poll = datagram_poll,
1384 .listen = nr_listen,
1385 .shutdown = sock_no_shutdown,
1386 .setsockopt = nr_setsockopt,
1387 .getsockopt = nr_getsockopt,
1388 .sendmsg = nr_sendmsg,
1389 .recvmsg = nr_recvmsg,
1390 .mmap = sock_no_mmap,
1391 .sendpage = sock_no_sendpage,
1394 static struct notifier_block nr_dev_notifier = {
1395 .notifier_call = nr_device_event,
1398 static struct net_device **dev_nr;
1400 static struct ax25_protocol nr_pid = {
1401 .pid = AX25_P_NETROM,
1402 .func = nr_route_frame
1405 static struct ax25_linkfail nr_linkfail_notifier = {
1406 .func = nr_link_failed,
1409 static int __init nr_proto_init(void)
1412 int rc = proto_register(&nr_proto, 0);
1417 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1418 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n");
1422 dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL);
1423 if (dev_nr == NULL) {
1424 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n");
1428 for (i = 0; i < nr_ndevs; i++) {
1429 char name[IFNAMSIZ];
1430 struct net_device *dev;
1432 sprintf(name, "nr%d", i);
1433 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, nr_setup);
1435 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n");
1440 if (register_netdev(dev)) {
1441 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n");
1445 nr_set_lockdep_key(dev);
1449 if (sock_register(&nr_family_ops)) {
1450 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n");
1454 register_netdevice_notifier(&nr_dev_notifier);
1456 ax25_register_pid(&nr_pid);
1457 ax25_linkfail_register(&nr_linkfail_notifier);
1459 #ifdef CONFIG_SYSCTL
1460 nr_register_sysctl();
1465 proc_create("nr", S_IRUGO, init_net.proc_net, &nr_info_fops);
1466 proc_create("nr_neigh", S_IRUGO, init_net.proc_net, &nr_neigh_fops);
1467 proc_create("nr_nodes", S_IRUGO, init_net.proc_net, &nr_nodes_fops);
1472 unregister_netdev(dev_nr[i]);
1473 free_netdev(dev_nr[i]);
1476 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);