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 * Socket removal during an interrupt is now safe.
69 static void nr_remove_socket(struct sock *sk)
71 spin_lock_bh(&nr_list_lock);
73 spin_unlock_bh(&nr_list_lock);
77 * Kill all bound sockets on a dropped device.
79 static void nr_kill_by_device(struct net_device *dev)
83 spin_lock_bh(&nr_list_lock);
84 sk_for_each(s, &nr_list)
85 if (nr_sk(s)->device == dev)
86 nr_disconnect(s, ENETUNREACH);
87 spin_unlock_bh(&nr_list_lock);
91 * Handle device status changes.
93 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
95 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
97 if (!net_eq(dev_net(dev), &init_net))
100 if (event != NETDEV_DOWN)
103 nr_kill_by_device(dev);
104 nr_rt_device_down(dev);
110 * Add a socket to the bound sockets list.
112 static void nr_insert_socket(struct sock *sk)
114 spin_lock_bh(&nr_list_lock);
115 sk_add_node(sk, &nr_list);
116 spin_unlock_bh(&nr_list_lock);
120 * Find a socket that wants to accept the Connect Request we just
123 static struct sock *nr_find_listener(ax25_address *addr)
127 spin_lock_bh(&nr_list_lock);
128 sk_for_each(s, &nr_list)
129 if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
130 s->sk_state == TCP_LISTEN) {
136 spin_unlock_bh(&nr_list_lock);
141 * Find a connected NET/ROM socket given my circuit IDs.
143 static struct sock *nr_find_socket(unsigned char index, unsigned char id)
147 spin_lock_bh(&nr_list_lock);
148 sk_for_each(s, &nr_list) {
149 struct nr_sock *nr = nr_sk(s);
151 if (nr->my_index == index && nr->my_id == id) {
158 spin_unlock_bh(&nr_list_lock);
163 * Find a connected NET/ROM socket given their circuit IDs.
165 static struct sock *nr_find_peer(unsigned char index, unsigned char id,
170 spin_lock_bh(&nr_list_lock);
171 sk_for_each(s, &nr_list) {
172 struct nr_sock *nr = nr_sk(s);
174 if (nr->your_index == index && nr->your_id == id &&
175 !ax25cmp(&nr->dest_addr, dest)) {
182 spin_unlock_bh(&nr_list_lock);
187 * Find next free circuit ID.
189 static unsigned short nr_find_next_circuit(void)
191 unsigned short id = circuit;
199 if (i != 0 && j != 0) {
200 if ((sk=nr_find_socket(i, j)) == NULL)
214 void nr_destroy_socket(struct sock *);
217 * Handler for deferred kills.
219 static void nr_destroy_timer(struct timer_list *t)
221 struct sock *sk = from_timer(sk, t, sk_timer);
224 nr_destroy_socket(sk);
230 * This is called from user mode and the timers. Thus it protects itself
231 * against interrupt users but doesn't worry about being called during
232 * work. Once it is removed from the queue no interrupt or bottom half
233 * will touch it and we are (fairly 8-) ) safe.
235 void nr_destroy_socket(struct sock *sk)
239 nr_remove_socket(sk);
241 nr_stop_heartbeat(sk);
245 nr_stop_idletimer(sk);
247 nr_clear_queues(sk); /* Flush the queues */
249 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
250 if (skb->sk != sk) { /* A pending connection */
251 /* Queue the unaccepted socket for death */
252 sock_set_flag(skb->sk, SOCK_DEAD);
253 nr_start_heartbeat(skb->sk);
254 nr_sk(skb->sk)->state = NR_STATE_0;
260 if (sk_has_allocations(sk)) {
261 /* Defer: outstanding buffers */
262 sk->sk_timer.function = nr_destroy_timer;
263 sk->sk_timer.expires = jiffies + 2 * HZ;
264 add_timer(&sk->sk_timer);
270 * Handling for system calls applied via the various interfaces to a
271 * NET/ROM socket object.
274 static int nr_setsockopt(struct socket *sock, int level, int optname,
275 char __user *optval, unsigned int optlen)
277 struct sock *sk = sock->sk;
278 struct nr_sock *nr = nr_sk(sk);
281 if (level != SOL_NETROM)
284 if (optlen < sizeof(unsigned int))
287 if (get_user(opt, (unsigned int __user *)optval))
292 if (opt < 1 || opt > ULONG_MAX / HZ)
298 if (opt < 1 || opt > ULONG_MAX / HZ)
304 if (opt < 1 || opt > 31)
310 if (opt < 1 || opt > ULONG_MAX / HZ)
316 if (opt > ULONG_MAX / (60 * HZ))
318 nr->idle = opt * 60 * HZ;
326 static int nr_getsockopt(struct socket *sock, int level, int optname,
327 char __user *optval, int __user *optlen)
329 struct sock *sk = sock->sk;
330 struct nr_sock *nr = nr_sk(sk);
334 if (level != SOL_NETROM)
337 if (get_user(len, optlen))
361 val = nr->idle / (60 * HZ);
368 len = min_t(unsigned int, len, sizeof(int));
370 if (put_user(len, optlen))
373 return copy_to_user(optval, &val, len) ? -EFAULT : 0;
376 static int nr_listen(struct socket *sock, int backlog)
378 struct sock *sk = sock->sk;
381 if (sk->sk_state != TCP_LISTEN) {
382 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
383 sk->sk_max_ack_backlog = backlog;
384 sk->sk_state = TCP_LISTEN;
393 static struct proto nr_proto = {
395 .owner = THIS_MODULE,
396 .obj_size = sizeof(struct nr_sock),
399 static int nr_create(struct net *net, struct socket *sock, int protocol,
405 if (!net_eq(net, &init_net))
406 return -EAFNOSUPPORT;
408 if (sock->type != SOCK_SEQPACKET || protocol != 0)
409 return -ESOCKTNOSUPPORT;
411 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto, kern);
417 sock_init_data(sock, sk);
419 sock->ops = &nr_proto_ops;
420 sk->sk_protocol = protocol;
422 skb_queue_head_init(&nr->ack_queue);
423 skb_queue_head_init(&nr->reseq_queue);
424 skb_queue_head_init(&nr->frag_queue);
429 msecs_to_jiffies(sysctl_netrom_transport_timeout);
431 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
433 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
435 msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
437 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
438 nr->window = sysctl_netrom_transport_requested_window_size;
441 nr->state = NR_STATE_0;
446 static struct sock *nr_make_new(struct sock *osk)
449 struct nr_sock *nr, *onr;
451 if (osk->sk_type != SOCK_SEQPACKET)
454 sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot, 0);
460 sock_init_data(NULL, sk);
462 sk->sk_type = osk->sk_type;
463 sk->sk_priority = osk->sk_priority;
464 sk->sk_protocol = osk->sk_protocol;
465 sk->sk_rcvbuf = osk->sk_rcvbuf;
466 sk->sk_sndbuf = osk->sk_sndbuf;
467 sk->sk_state = TCP_ESTABLISHED;
468 sock_copy_flags(sk, osk);
470 skb_queue_head_init(&nr->ack_queue);
471 skb_queue_head_init(&nr->reseq_queue);
472 skb_queue_head_init(&nr->frag_queue);
482 nr->idle = onr->idle;
483 nr->window = onr->window;
485 nr->device = onr->device;
486 nr->bpqext = onr->bpqext;
491 static int nr_release(struct socket *sock)
493 struct sock *sk = sock->sk;
496 if (sk == NULL) return 0;
507 nr_disconnect(sk, 0);
508 nr_destroy_socket(sk);
514 nr_write_internal(sk, NR_DISCREQ);
515 nr_start_t1timer(sk);
518 nr_stop_idletimer(sk);
519 nr->state = NR_STATE_2;
520 sk->sk_state = TCP_CLOSE;
521 sk->sk_shutdown |= SEND_SHUTDOWN;
522 sk->sk_state_change(sk);
523 sock_set_flag(sk, SOCK_DESTROY);
537 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
539 struct sock *sk = sock->sk;
540 struct nr_sock *nr = nr_sk(sk);
541 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
542 struct net_device *dev;
543 ax25_uid_assoc *user;
544 ax25_address *source;
547 if (!sock_flag(sk, SOCK_ZAPPED)) {
551 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
555 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
559 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
563 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
565 return -EADDRNOTAVAIL;
569 * Only the super user can set an arbitrary user callsign.
571 if (addr->fsa_ax25.sax25_ndigis == 1) {
572 if (!capable(CAP_NET_BIND_SERVICE)) {
577 nr->user_addr = addr->fsa_digipeater[0];
578 nr->source_addr = addr->fsa_ax25.sax25_call;
580 source = &addr->fsa_ax25.sax25_call;
582 user = ax25_findbyuid(current_euid());
584 nr->user_addr = user->call;
587 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
592 nr->user_addr = *source;
595 nr->source_addr = *source;
599 nr_insert_socket(sk);
601 sock_reset_flag(sk, SOCK_ZAPPED);
608 static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
609 int addr_len, int flags)
611 struct sock *sk = sock->sk;
612 struct nr_sock *nr = nr_sk(sk);
613 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
614 ax25_address *source = NULL;
615 ax25_uid_assoc *user;
616 struct net_device *dev;
620 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
621 sock->state = SS_CONNECTED;
622 goto out_release; /* Connect completed during a ERESTARTSYS event */
625 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
626 sock->state = SS_UNCONNECTED;
631 if (sk->sk_state == TCP_ESTABLISHED) {
632 err = -EISCONN; /* No reconnect on a seqpacket socket */
636 sk->sk_state = TCP_CLOSE;
637 sock->state = SS_UNCONNECTED;
639 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
643 if (addr->sax25_family != AF_NETROM) {
647 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */
648 sock_reset_flag(sk, SOCK_ZAPPED);
650 if ((dev = nr_dev_first()) == NULL) {
654 source = (ax25_address *)dev->dev_addr;
656 user = ax25_findbyuid(current_euid());
658 nr->user_addr = user->call;
661 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
666 nr->user_addr = *source;
669 nr->source_addr = *source;
673 nr_insert_socket(sk); /* Finish the bind */
676 nr->dest_addr = addr->sax25_call;
679 circuit = nr_find_next_circuit();
682 nr->my_index = circuit / 256;
683 nr->my_id = circuit % 256;
687 /* Move to connecting socket, start sending Connect Requests */
688 sock->state = SS_CONNECTING;
689 sk->sk_state = TCP_SYN_SENT;
691 nr_establish_data_link(sk);
693 nr->state = NR_STATE_1;
695 nr_start_heartbeat(sk);
698 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
704 * A Connect Ack with Choke or timeout or failed routing will go to
707 if (sk->sk_state == TCP_SYN_SENT) {
711 prepare_to_wait(sk_sleep(sk), &wait,
713 if (sk->sk_state != TCP_SYN_SENT)
715 if (!signal_pending(current)) {
724 finish_wait(sk_sleep(sk), &wait);
729 if (sk->sk_state != TCP_ESTABLISHED) {
730 sock->state = SS_UNCONNECTED;
731 err = sock_error(sk); /* Always set at this point */
735 sock->state = SS_CONNECTED;
743 static int nr_accept(struct socket *sock, struct socket *newsock, int flags,
752 if ((sk = sock->sk) == NULL)
756 if (sk->sk_type != SOCK_SEQPACKET) {
761 if (sk->sk_state != TCP_LISTEN) {
767 * The write queue this time is holding sockets ready to use
768 * hooked into the SABM we saved
771 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
772 skb = skb_dequeue(&sk->sk_receive_queue);
776 if (flags & O_NONBLOCK) {
780 if (!signal_pending(current)) {
789 finish_wait(sk_sleep(sk), &wait);
794 sock_graft(newsk, newsock);
796 /* Now attach up the new socket */
798 sk_acceptq_removed(sk);
806 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
809 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
810 struct sock *sk = sock->sk;
811 struct nr_sock *nr = nr_sk(sk);
814 memset(&sax->fsa_ax25, 0, sizeof(struct sockaddr_ax25));
818 if (sk->sk_state != TCP_ESTABLISHED) {
822 sax->fsa_ax25.sax25_family = AF_NETROM;
823 sax->fsa_ax25.sax25_ndigis = 1;
824 sax->fsa_ax25.sax25_call = nr->user_addr;
825 memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater));
826 sax->fsa_digipeater[0] = nr->dest_addr;
827 uaddr_len = sizeof(struct full_sockaddr_ax25);
829 sax->fsa_ax25.sax25_family = AF_NETROM;
830 sax->fsa_ax25.sax25_ndigis = 0;
831 sax->fsa_ax25.sax25_call = nr->source_addr;
832 uaddr_len = sizeof(struct sockaddr_ax25);
839 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
843 struct nr_sock *nr_make;
844 ax25_address *src, *dest, *user;
845 unsigned short circuit_index, circuit_id;
846 unsigned short peer_circuit_index, peer_circuit_id;
847 unsigned short frametype, flags, window, timeout;
853 * skb->data points to the netrom frame start
856 src = (ax25_address *)(skb->data + 0);
857 dest = (ax25_address *)(skb->data + 7);
859 circuit_index = skb->data[15];
860 circuit_id = skb->data[16];
861 peer_circuit_index = skb->data[17];
862 peer_circuit_id = skb->data[18];
863 frametype = skb->data[19] & 0x0F;
864 flags = skb->data[19] & 0xF0;
867 * Check for an incoming IP over NET/ROM frame.
869 if (frametype == NR_PROTOEXT &&
870 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
871 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
872 skb_reset_transport_header(skb);
874 return nr_rx_ip(skb, dev);
878 * Find an existing socket connection, based on circuit ID, if it's
879 * a Connect Request base it on their circuit ID.
881 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
882 * circuit that no longer exists at the other end ...
887 if (circuit_index == 0 && circuit_id == 0) {
888 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
889 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
891 if (frametype == NR_CONNREQ)
892 sk = nr_find_peer(circuit_index, circuit_id, src);
894 sk = nr_find_socket(circuit_index, circuit_id);
899 skb_reset_transport_header(skb);
901 if (frametype == NR_CONNACK && skb->len == 22)
902 nr_sk(sk)->bpqext = 1;
904 nr_sk(sk)->bpqext = 0;
906 ret = nr_process_rx_frame(sk, skb);
913 * Now it should be a CONNREQ.
915 if (frametype != NR_CONNREQ) {
917 * Here it would be nice to be able to send a reset but
918 * NET/ROM doesn't have one. We've tried to extend the protocol
919 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
920 * apparently kills BPQ boxes... :-(
921 * So now we try to follow the established behaviour of
922 * G8PZT's Xrouter which is sending packets with command type 7
923 * as an extension of the protocol.
925 if (sysctl_netrom_reset_circuit &&
926 (frametype != NR_RESET || flags != 0))
927 nr_transmit_reset(skb, 1);
932 sk = nr_find_listener(dest);
934 user = (ax25_address *)(skb->data + 21);
936 if (sk == NULL || sk_acceptq_is_full(sk) ||
937 (make = nr_make_new(sk)) == NULL) {
938 nr_transmit_refusal(skb, 0);
946 window = skb->data[20];
950 skb->destructor = sock_efree;
951 make->sk_state = TCP_ESTABLISHED;
953 /* Fill in his circuit details */
954 nr_make = nr_sk(make);
955 nr_make->source_addr = *dest;
956 nr_make->dest_addr = *src;
957 nr_make->user_addr = *user;
959 nr_make->your_index = circuit_index;
960 nr_make->your_id = circuit_id;
963 circuit = nr_find_next_circuit();
966 nr_make->my_index = circuit / 256;
967 nr_make->my_id = circuit % 256;
971 /* Window negotiation */
972 if (window < nr_make->window)
973 nr_make->window = window;
975 /* L4 timeout negotiation */
976 if (skb->len == 37) {
977 timeout = skb->data[36] * 256 + skb->data[35];
978 if (timeout * HZ < nr_make->t1)
979 nr_make->t1 = timeout * HZ;
985 nr_write_internal(make, NR_CONNACK);
987 nr_make->condition = 0x00;
992 nr_make->state = NR_STATE_3;
993 sk_acceptq_added(sk);
994 skb_queue_head(&sk->sk_receive_queue, skb);
996 if (!sock_flag(sk, SOCK_DEAD))
997 sk->sk_data_ready(sk);
1002 nr_insert_socket(make);
1004 nr_start_heartbeat(make);
1005 nr_start_idletimer(make);
1010 static int nr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1012 struct sock *sk = sock->sk;
1013 struct nr_sock *nr = nr_sk(sk);
1014 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
1016 struct sockaddr_ax25 sax;
1017 struct sk_buff *skb;
1018 unsigned char *asmptr;
1021 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1025 if (sock_flag(sk, SOCK_ZAPPED)) {
1026 err = -EADDRNOTAVAIL;
1030 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1031 send_sig(SIGPIPE, current, 0);
1036 if (nr->device == NULL) {
1042 if (msg->msg_namelen < sizeof(sax)) {
1047 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1051 if (sax.sax25_family != AF_NETROM) {
1056 if (sk->sk_state != TCP_ESTABLISHED) {
1060 sax.sax25_family = AF_NETROM;
1061 sax.sax25_call = nr->dest_addr;
1064 /* Build a packet - the conventional user limit is 236 bytes. We can
1065 do ludicrously large NetROM frames but must not overflow */
1071 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1073 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1076 skb_reserve(skb, size - len);
1077 skb_reset_transport_header(skb);
1080 * Push down the NET/ROM header
1083 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1085 /* Build a NET/ROM Transport header */
1087 *asmptr++ = nr->your_index;
1088 *asmptr++ = nr->your_id;
1089 *asmptr++ = 0; /* To be filled in later */
1090 *asmptr++ = 0; /* Ditto */
1091 *asmptr++ = NR_INFO;
1094 * Put the data on the end
1098 /* User data follows immediately after the NET/ROM transport header */
1099 if (memcpy_from_msg(skb_transport_header(skb), msg, len)) {
1105 if (sk->sk_state != TCP_ESTABLISHED) {
1111 nr_output(sk, skb); /* Shove it onto the queue */
1119 static int nr_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1122 struct sock *sk = sock->sk;
1123 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
1125 struct sk_buff *skb;
1129 * This works for seqpacket too. The receiver has ordered the queue for
1130 * us! We do one quick check first though
1134 if (sk->sk_state != TCP_ESTABLISHED) {
1139 /* Now we can treat all alike */
1140 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1145 skb_reset_transport_header(skb);
1148 if (copied > size) {
1150 msg->msg_flags |= MSG_TRUNC;
1153 er = skb_copy_datagram_msg(skb, 0, msg, copied);
1155 skb_free_datagram(sk, skb);
1161 memset(sax, 0, sizeof(*sax));
1162 sax->sax25_family = AF_NETROM;
1163 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1165 msg->msg_namelen = sizeof(*sax);
1168 skb_free_datagram(sk, skb);
1175 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1177 struct sock *sk = sock->sk;
1178 void __user *argp = (void __user *)arg;
1185 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1189 return put_user(amount, (int __user *)argp);
1193 struct sk_buff *skb;
1197 /* These two are safe on a single CPU system as only user tasks fiddle here */
1198 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1201 return put_user(amount, (int __user *)argp);
1206 case SIOCGIFDSTADDR:
1207 case SIOCSIFDSTADDR:
1208 case SIOCGIFBRDADDR:
1209 case SIOCSIFBRDADDR:
1210 case SIOCGIFNETMASK:
1211 case SIOCSIFNETMASK:
1219 if (!capable(CAP_NET_ADMIN))
1221 return nr_rt_ioctl(cmd, argp);
1224 return -ENOIOCTLCMD;
1230 #ifdef CONFIG_PROC_FS
1232 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1234 spin_lock_bh(&nr_list_lock);
1235 return seq_hlist_start_head(&nr_list, *pos);
1238 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1240 return seq_hlist_next(v, &nr_list, pos);
1243 static void nr_info_stop(struct seq_file *seq, void *v)
1245 spin_unlock_bh(&nr_list_lock);
1248 static int nr_info_show(struct seq_file *seq, void *v)
1250 struct sock *s = sk_entry(v);
1251 struct net_device *dev;
1253 const char *devname;
1256 if (v == SEQ_START_TOKEN)
1258 "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");
1265 if ((dev = nr->device) == NULL)
1268 devname = dev->name;
1270 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1271 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1273 "%-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",
1274 ax2asc(buf, &nr->source_addr),
1284 ax25_display_timer(&nr->t1timer) / HZ,
1286 ax25_display_timer(&nr->t2timer) / HZ,
1288 ax25_display_timer(&nr->t4timer) / HZ,
1290 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1291 nr->idle / (60 * HZ),
1295 sk_wmem_alloc_get(s),
1296 sk_rmem_alloc_get(s),
1297 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1304 static const struct seq_operations nr_info_seqops = {
1305 .start = nr_info_start,
1306 .next = nr_info_next,
1307 .stop = nr_info_stop,
1308 .show = nr_info_show,
1310 #endif /* CONFIG_PROC_FS */
1312 static const struct net_proto_family nr_family_ops = {
1313 .family = PF_NETROM,
1314 .create = nr_create,
1315 .owner = THIS_MODULE,
1318 static const struct proto_ops nr_proto_ops = {
1319 .family = PF_NETROM,
1320 .owner = THIS_MODULE,
1321 .release = nr_release,
1323 .connect = nr_connect,
1324 .socketpair = sock_no_socketpair,
1325 .accept = nr_accept,
1326 .getname = nr_getname,
1327 .poll = datagram_poll,
1329 .gettstamp = sock_gettstamp,
1330 .listen = nr_listen,
1331 .shutdown = sock_no_shutdown,
1332 .setsockopt = nr_setsockopt,
1333 .getsockopt = nr_getsockopt,
1334 .sendmsg = nr_sendmsg,
1335 .recvmsg = nr_recvmsg,
1336 .mmap = sock_no_mmap,
1337 .sendpage = sock_no_sendpage,
1340 static struct notifier_block nr_dev_notifier = {
1341 .notifier_call = nr_device_event,
1344 static struct net_device **dev_nr;
1346 static struct ax25_protocol nr_pid = {
1347 .pid = AX25_P_NETROM,
1348 .func = nr_route_frame
1351 static struct ax25_linkfail nr_linkfail_notifier = {
1352 .func = nr_link_failed,
1355 static int __init nr_proto_init(void)
1358 int rc = proto_register(&nr_proto, 0);
1363 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1364 pr_err("NET/ROM: %s - nr_ndevs parameter too large\n",
1367 goto unregister_proto;
1370 dev_nr = kcalloc(nr_ndevs, sizeof(struct net_device *), GFP_KERNEL);
1372 pr_err("NET/ROM: %s - unable to allocate device array\n",
1375 goto unregister_proto;
1378 for (i = 0; i < nr_ndevs; i++) {
1379 char name[IFNAMSIZ];
1380 struct net_device *dev;
1382 sprintf(name, "nr%d", i);
1383 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, nr_setup);
1390 rc = register_netdev(dev);
1398 rc = sock_register(&nr_family_ops);
1402 rc = register_netdevice_notifier(&nr_dev_notifier);
1406 ax25_register_pid(&nr_pid);
1407 ax25_linkfail_register(&nr_linkfail_notifier);
1409 #ifdef CONFIG_SYSCTL
1410 rc = nr_register_sysctl();
1418 if (!proc_create_seq("nr", 0444, init_net.proc_net, &nr_info_seqops))
1420 if (!proc_create_seq("nr_neigh", 0444, init_net.proc_net,
1423 if (!proc_create_seq("nr_nodes", 0444, init_net.proc_net,
1430 remove_proc_entry("nr_neigh", init_net.proc_net);
1432 remove_proc_entry("nr", init_net.proc_net);
1435 nr_loopback_clear();
1438 #ifdef CONFIG_SYSCTL
1439 nr_unregister_sysctl();
1442 ax25_linkfail_release(&nr_linkfail_notifier);
1443 ax25_protocol_release(AX25_P_NETROM);
1444 unregister_netdevice_notifier(&nr_dev_notifier);
1446 sock_unregister(PF_NETROM);
1449 unregister_netdev(dev_nr[i]);
1450 free_netdev(dev_nr[i]);
1454 proto_unregister(&nr_proto);
1458 module_init(nr_proto_init);
1460 module_param(nr_ndevs, int, 0);
1461 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1463 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1464 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1465 MODULE_LICENSE("GPL");
1466 MODULE_ALIAS_NETPROTO(PF_NETROM);
1468 static void __exit nr_exit(void)
1472 remove_proc_entry("nr", init_net.proc_net);
1473 remove_proc_entry("nr_neigh", init_net.proc_net);
1474 remove_proc_entry("nr_nodes", init_net.proc_net);
1475 nr_loopback_clear();
1479 #ifdef CONFIG_SYSCTL
1480 nr_unregister_sysctl();
1483 ax25_linkfail_release(&nr_linkfail_notifier);
1484 ax25_protocol_release(AX25_P_NETROM);
1486 unregister_netdevice_notifier(&nr_dev_notifier);
1488 sock_unregister(PF_NETROM);
1490 for (i = 0; i < nr_ndevs; i++) {
1491 struct net_device *dev = dev_nr[i];
1493 unregister_netdev(dev);
1499 proto_unregister(&nr_proto);
1501 module_exit(nr_exit);