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 (sock->state != SS_UNCONNECTED) {
386 if (sk->sk_state != TCP_LISTEN) {
387 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
388 sk->sk_max_ack_backlog = backlog;
389 sk->sk_state = TCP_LISTEN;
398 static struct proto nr_proto = {
400 .owner = THIS_MODULE,
401 .obj_size = sizeof(struct nr_sock),
404 static int nr_create(struct net *net, struct socket *sock, int protocol,
410 if (!net_eq(net, &init_net))
411 return -EAFNOSUPPORT;
413 if (sock->type != SOCK_SEQPACKET || protocol != 0)
414 return -ESOCKTNOSUPPORT;
416 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto, kern);
422 sock_init_data(sock, sk);
424 sock->ops = &nr_proto_ops;
425 sk->sk_protocol = protocol;
427 skb_queue_head_init(&nr->ack_queue);
428 skb_queue_head_init(&nr->reseq_queue);
429 skb_queue_head_init(&nr->frag_queue);
434 msecs_to_jiffies(sysctl_netrom_transport_timeout);
436 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
438 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
440 msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
442 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
443 nr->window = sysctl_netrom_transport_requested_window_size;
446 nr->state = NR_STATE_0;
451 static struct sock *nr_make_new(struct sock *osk)
454 struct nr_sock *nr, *onr;
456 if (osk->sk_type != SOCK_SEQPACKET)
459 sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot, 0);
465 sock_init_data(NULL, sk);
467 sk->sk_type = osk->sk_type;
468 sk->sk_priority = osk->sk_priority;
469 sk->sk_protocol = osk->sk_protocol;
470 sk->sk_rcvbuf = osk->sk_rcvbuf;
471 sk->sk_sndbuf = osk->sk_sndbuf;
472 sk->sk_state = TCP_ESTABLISHED;
473 sock_copy_flags(sk, osk);
475 skb_queue_head_init(&nr->ack_queue);
476 skb_queue_head_init(&nr->reseq_queue);
477 skb_queue_head_init(&nr->frag_queue);
487 nr->idle = onr->idle;
488 nr->window = onr->window;
490 nr->device = onr->device;
491 nr->bpqext = onr->bpqext;
496 static int nr_release(struct socket *sock)
498 struct sock *sk = sock->sk;
501 if (sk == NULL) return 0;
512 nr_disconnect(sk, 0);
513 nr_destroy_socket(sk);
519 nr_write_internal(sk, NR_DISCREQ);
520 nr_start_t1timer(sk);
523 nr_stop_idletimer(sk);
524 nr->state = NR_STATE_2;
525 sk->sk_state = TCP_CLOSE;
526 sk->sk_shutdown |= SEND_SHUTDOWN;
527 sk->sk_state_change(sk);
528 sock_set_flag(sk, SOCK_DESTROY);
542 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
544 struct sock *sk = sock->sk;
545 struct nr_sock *nr = nr_sk(sk);
546 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
547 struct net_device *dev;
548 ax25_uid_assoc *user;
549 ax25_address *source;
552 if (!sock_flag(sk, SOCK_ZAPPED)) {
556 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
560 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
564 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
568 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
570 return -EADDRNOTAVAIL;
574 * Only the super user can set an arbitrary user callsign.
576 if (addr->fsa_ax25.sax25_ndigis == 1) {
577 if (!capable(CAP_NET_BIND_SERVICE)) {
582 nr->user_addr = addr->fsa_digipeater[0];
583 nr->source_addr = addr->fsa_ax25.sax25_call;
585 source = &addr->fsa_ax25.sax25_call;
587 user = ax25_findbyuid(current_euid());
589 nr->user_addr = user->call;
592 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
597 nr->user_addr = *source;
600 nr->source_addr = *source;
604 nr_insert_socket(sk);
606 sock_reset_flag(sk, SOCK_ZAPPED);
613 static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
614 int addr_len, int flags)
616 struct sock *sk = sock->sk;
617 struct nr_sock *nr = nr_sk(sk);
618 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
619 ax25_address *source = NULL;
620 ax25_uid_assoc *user;
621 struct net_device *dev;
625 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
626 sock->state = SS_CONNECTED;
627 goto out_release; /* Connect completed during a ERESTARTSYS event */
630 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
631 sock->state = SS_UNCONNECTED;
636 if (sk->sk_state == TCP_ESTABLISHED) {
637 err = -EISCONN; /* No reconnect on a seqpacket socket */
641 if (sock->state == SS_CONNECTING) {
646 sk->sk_state = TCP_CLOSE;
647 sock->state = SS_UNCONNECTED;
649 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
653 if (addr->sax25_family != AF_NETROM) {
657 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */
658 sock_reset_flag(sk, SOCK_ZAPPED);
660 if ((dev = nr_dev_first()) == NULL) {
664 source = (ax25_address *)dev->dev_addr;
666 user = ax25_findbyuid(current_euid());
668 nr->user_addr = user->call;
671 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
676 nr->user_addr = *source;
679 nr->source_addr = *source;
683 nr_insert_socket(sk); /* Finish the bind */
686 nr->dest_addr = addr->sax25_call;
689 circuit = nr_find_next_circuit();
692 nr->my_index = circuit / 256;
693 nr->my_id = circuit % 256;
697 /* Move to connecting socket, start sending Connect Requests */
698 sock->state = SS_CONNECTING;
699 sk->sk_state = TCP_SYN_SENT;
701 nr_establish_data_link(sk);
703 nr->state = NR_STATE_1;
705 nr_start_heartbeat(sk);
708 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
714 * A Connect Ack with Choke or timeout or failed routing will go to
717 if (sk->sk_state == TCP_SYN_SENT) {
721 prepare_to_wait(sk_sleep(sk), &wait,
723 if (sk->sk_state != TCP_SYN_SENT)
725 if (!signal_pending(current)) {
734 finish_wait(sk_sleep(sk), &wait);
739 if (sk->sk_state != TCP_ESTABLISHED) {
740 sock->state = SS_UNCONNECTED;
741 err = sock_error(sk); /* Always set at this point */
745 sock->state = SS_CONNECTED;
753 static int nr_accept(struct socket *sock, struct socket *newsock, int flags,
762 if ((sk = sock->sk) == NULL)
766 if (sk->sk_type != SOCK_SEQPACKET) {
771 if (sk->sk_state != TCP_LISTEN) {
777 * The write queue this time is holding sockets ready to use
778 * hooked into the SABM we saved
781 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
782 skb = skb_dequeue(&sk->sk_receive_queue);
786 if (flags & O_NONBLOCK) {
790 if (!signal_pending(current)) {
799 finish_wait(sk_sleep(sk), &wait);
804 sock_graft(newsk, newsock);
806 /* Now attach up the new socket */
808 sk_acceptq_removed(sk);
816 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
819 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
820 struct sock *sk = sock->sk;
821 struct nr_sock *nr = nr_sk(sk);
824 memset(&sax->fsa_ax25, 0, sizeof(struct sockaddr_ax25));
828 if (sk->sk_state != TCP_ESTABLISHED) {
832 sax->fsa_ax25.sax25_family = AF_NETROM;
833 sax->fsa_ax25.sax25_ndigis = 1;
834 sax->fsa_ax25.sax25_call = nr->user_addr;
835 memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater));
836 sax->fsa_digipeater[0] = nr->dest_addr;
837 uaddr_len = sizeof(struct full_sockaddr_ax25);
839 sax->fsa_ax25.sax25_family = AF_NETROM;
840 sax->fsa_ax25.sax25_ndigis = 0;
841 sax->fsa_ax25.sax25_call = nr->source_addr;
842 uaddr_len = sizeof(struct sockaddr_ax25);
849 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
853 struct nr_sock *nr_make;
854 ax25_address *src, *dest, *user;
855 unsigned short circuit_index, circuit_id;
856 unsigned short peer_circuit_index, peer_circuit_id;
857 unsigned short frametype, flags, window, timeout;
863 * skb->data points to the netrom frame start
866 src = (ax25_address *)(skb->data + 0);
867 dest = (ax25_address *)(skb->data + 7);
869 circuit_index = skb->data[15];
870 circuit_id = skb->data[16];
871 peer_circuit_index = skb->data[17];
872 peer_circuit_id = skb->data[18];
873 frametype = skb->data[19] & 0x0F;
874 flags = skb->data[19] & 0xF0;
877 * Check for an incoming IP over NET/ROM frame.
879 if (frametype == NR_PROTOEXT &&
880 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
881 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
882 skb_reset_transport_header(skb);
884 return nr_rx_ip(skb, dev);
888 * Find an existing socket connection, based on circuit ID, if it's
889 * a Connect Request base it on their circuit ID.
891 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
892 * circuit that no longer exists at the other end ...
897 if (circuit_index == 0 && circuit_id == 0) {
898 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
899 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
901 if (frametype == NR_CONNREQ)
902 sk = nr_find_peer(circuit_index, circuit_id, src);
904 sk = nr_find_socket(circuit_index, circuit_id);
909 skb_reset_transport_header(skb);
911 if (frametype == NR_CONNACK && skb->len == 22)
912 nr_sk(sk)->bpqext = 1;
914 nr_sk(sk)->bpqext = 0;
916 ret = nr_process_rx_frame(sk, skb);
923 * Now it should be a CONNREQ.
925 if (frametype != NR_CONNREQ) {
927 * Here it would be nice to be able to send a reset but
928 * NET/ROM doesn't have one. We've tried to extend the protocol
929 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
930 * apparently kills BPQ boxes... :-(
931 * So now we try to follow the established behaviour of
932 * G8PZT's Xrouter which is sending packets with command type 7
933 * as an extension of the protocol.
935 if (sysctl_netrom_reset_circuit &&
936 (frametype != NR_RESET || flags != 0))
937 nr_transmit_reset(skb, 1);
942 sk = nr_find_listener(dest);
944 user = (ax25_address *)(skb->data + 21);
946 if (sk == NULL || sk_acceptq_is_full(sk) ||
947 (make = nr_make_new(sk)) == NULL) {
948 nr_transmit_refusal(skb, 0);
956 window = skb->data[20];
960 skb->destructor = sock_efree;
961 make->sk_state = TCP_ESTABLISHED;
963 /* Fill in his circuit details */
964 nr_make = nr_sk(make);
965 nr_make->source_addr = *dest;
966 nr_make->dest_addr = *src;
967 nr_make->user_addr = *user;
969 nr_make->your_index = circuit_index;
970 nr_make->your_id = circuit_id;
973 circuit = nr_find_next_circuit();
976 nr_make->my_index = circuit / 256;
977 nr_make->my_id = circuit % 256;
981 /* Window negotiation */
982 if (window < nr_make->window)
983 nr_make->window = window;
985 /* L4 timeout negotiation */
986 if (skb->len == 37) {
987 timeout = skb->data[36] * 256 + skb->data[35];
988 if (timeout * HZ < nr_make->t1)
989 nr_make->t1 = timeout * HZ;
995 nr_write_internal(make, NR_CONNACK);
997 nr_make->condition = 0x00;
1002 nr_make->state = NR_STATE_3;
1003 sk_acceptq_added(sk);
1004 skb_queue_head(&sk->sk_receive_queue, skb);
1006 if (!sock_flag(sk, SOCK_DEAD))
1007 sk->sk_data_ready(sk);
1012 nr_insert_socket(make);
1014 nr_start_heartbeat(make);
1015 nr_start_idletimer(make);
1020 static int nr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1022 struct sock *sk = sock->sk;
1023 struct nr_sock *nr = nr_sk(sk);
1024 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
1026 struct sockaddr_ax25 sax;
1027 struct sk_buff *skb;
1028 unsigned char *asmptr;
1031 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1035 if (sock_flag(sk, SOCK_ZAPPED)) {
1036 err = -EADDRNOTAVAIL;
1040 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1041 send_sig(SIGPIPE, current, 0);
1046 if (nr->device == NULL) {
1052 if (msg->msg_namelen < sizeof(sax)) {
1057 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1061 if (sax.sax25_family != AF_NETROM) {
1066 if (sk->sk_state != TCP_ESTABLISHED) {
1070 sax.sax25_family = AF_NETROM;
1071 sax.sax25_call = nr->dest_addr;
1074 /* Build a packet - the conventional user limit is 236 bytes. We can
1075 do ludicrously large NetROM frames but must not overflow */
1081 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1083 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1086 skb_reserve(skb, size - len);
1087 skb_reset_transport_header(skb);
1090 * Push down the NET/ROM header
1093 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1095 /* Build a NET/ROM Transport header */
1097 *asmptr++ = nr->your_index;
1098 *asmptr++ = nr->your_id;
1099 *asmptr++ = 0; /* To be filled in later */
1100 *asmptr++ = 0; /* Ditto */
1101 *asmptr++ = NR_INFO;
1104 * Put the data on the end
1108 /* User data follows immediately after the NET/ROM transport header */
1109 if (memcpy_from_msg(skb_transport_header(skb), msg, len)) {
1115 if (sk->sk_state != TCP_ESTABLISHED) {
1121 nr_output(sk, skb); /* Shove it onto the queue */
1129 static int nr_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1132 struct sock *sk = sock->sk;
1133 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
1135 struct sk_buff *skb;
1139 * This works for seqpacket too. The receiver has ordered the queue for
1140 * us! We do one quick check first though
1144 if (sk->sk_state != TCP_ESTABLISHED) {
1149 /* Now we can treat all alike */
1150 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1155 skb_reset_transport_header(skb);
1158 if (copied > size) {
1160 msg->msg_flags |= MSG_TRUNC;
1163 er = skb_copy_datagram_msg(skb, 0, msg, copied);
1165 skb_free_datagram(sk, skb);
1171 memset(sax, 0, sizeof(*sax));
1172 sax->sax25_family = AF_NETROM;
1173 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1175 msg->msg_namelen = sizeof(*sax);
1178 skb_free_datagram(sk, skb);
1185 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1187 struct sock *sk = sock->sk;
1188 void __user *argp = (void __user *)arg;
1195 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1199 return put_user(amount, (int __user *)argp);
1203 struct sk_buff *skb;
1207 /* These two are safe on a single CPU system as only user tasks fiddle here */
1208 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1211 return put_user(amount, (int __user *)argp);
1216 case SIOCGIFDSTADDR:
1217 case SIOCSIFDSTADDR:
1218 case SIOCGIFBRDADDR:
1219 case SIOCSIFBRDADDR:
1220 case SIOCGIFNETMASK:
1221 case SIOCSIFNETMASK:
1229 if (!capable(CAP_NET_ADMIN))
1231 return nr_rt_ioctl(cmd, argp);
1234 return -ENOIOCTLCMD;
1240 #ifdef CONFIG_PROC_FS
1242 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1244 spin_lock_bh(&nr_list_lock);
1245 return seq_hlist_start_head(&nr_list, *pos);
1248 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1250 return seq_hlist_next(v, &nr_list, pos);
1253 static void nr_info_stop(struct seq_file *seq, void *v)
1255 spin_unlock_bh(&nr_list_lock);
1258 static int nr_info_show(struct seq_file *seq, void *v)
1260 struct sock *s = sk_entry(v);
1261 struct net_device *dev;
1263 const char *devname;
1266 if (v == SEQ_START_TOKEN)
1268 "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");
1275 if ((dev = nr->device) == NULL)
1278 devname = dev->name;
1280 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1281 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1283 "%-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",
1284 ax2asc(buf, &nr->source_addr),
1294 ax25_display_timer(&nr->t1timer) / HZ,
1296 ax25_display_timer(&nr->t2timer) / HZ,
1298 ax25_display_timer(&nr->t4timer) / HZ,
1300 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1301 nr->idle / (60 * HZ),
1305 sk_wmem_alloc_get(s),
1306 sk_rmem_alloc_get(s),
1307 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1314 static const struct seq_operations nr_info_seqops = {
1315 .start = nr_info_start,
1316 .next = nr_info_next,
1317 .stop = nr_info_stop,
1318 .show = nr_info_show,
1320 #endif /* CONFIG_PROC_FS */
1322 static const struct net_proto_family nr_family_ops = {
1323 .family = PF_NETROM,
1324 .create = nr_create,
1325 .owner = THIS_MODULE,
1328 static const struct proto_ops nr_proto_ops = {
1329 .family = PF_NETROM,
1330 .owner = THIS_MODULE,
1331 .release = nr_release,
1333 .connect = nr_connect,
1334 .socketpair = sock_no_socketpair,
1335 .accept = nr_accept,
1336 .getname = nr_getname,
1337 .poll = datagram_poll,
1339 .gettstamp = sock_gettstamp,
1340 .listen = nr_listen,
1341 .shutdown = sock_no_shutdown,
1342 .setsockopt = nr_setsockopt,
1343 .getsockopt = nr_getsockopt,
1344 .sendmsg = nr_sendmsg,
1345 .recvmsg = nr_recvmsg,
1346 .mmap = sock_no_mmap,
1347 .sendpage = sock_no_sendpage,
1350 static struct notifier_block nr_dev_notifier = {
1351 .notifier_call = nr_device_event,
1354 static struct net_device **dev_nr;
1356 static struct ax25_protocol nr_pid = {
1357 .pid = AX25_P_NETROM,
1358 .func = nr_route_frame
1361 static struct ax25_linkfail nr_linkfail_notifier = {
1362 .func = nr_link_failed,
1365 static int __init nr_proto_init(void)
1368 int rc = proto_register(&nr_proto, 0);
1373 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1374 pr_err("NET/ROM: %s - nr_ndevs parameter too large\n",
1377 goto unregister_proto;
1380 dev_nr = kcalloc(nr_ndevs, sizeof(struct net_device *), GFP_KERNEL);
1382 pr_err("NET/ROM: %s - unable to allocate device array\n",
1385 goto unregister_proto;
1388 for (i = 0; i < nr_ndevs; i++) {
1389 char name[IFNAMSIZ];
1390 struct net_device *dev;
1392 sprintf(name, "nr%d", i);
1393 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, nr_setup);
1400 rc = register_netdev(dev);
1408 rc = sock_register(&nr_family_ops);
1412 rc = register_netdevice_notifier(&nr_dev_notifier);
1416 ax25_register_pid(&nr_pid);
1417 ax25_linkfail_register(&nr_linkfail_notifier);
1419 #ifdef CONFIG_SYSCTL
1420 rc = nr_register_sysctl();
1428 if (!proc_create_seq("nr", 0444, init_net.proc_net, &nr_info_seqops))
1430 if (!proc_create_seq("nr_neigh", 0444, init_net.proc_net,
1433 if (!proc_create_seq("nr_nodes", 0444, init_net.proc_net,
1440 remove_proc_entry("nr_neigh", init_net.proc_net);
1442 remove_proc_entry("nr", init_net.proc_net);
1445 nr_loopback_clear();
1448 #ifdef CONFIG_SYSCTL
1449 nr_unregister_sysctl();
1452 ax25_linkfail_release(&nr_linkfail_notifier);
1453 ax25_protocol_release(AX25_P_NETROM);
1454 unregister_netdevice_notifier(&nr_dev_notifier);
1456 sock_unregister(PF_NETROM);
1459 unregister_netdev(dev_nr[i]);
1460 free_netdev(dev_nr[i]);
1464 proto_unregister(&nr_proto);
1468 module_init(nr_proto_init);
1470 module_param(nr_ndevs, int, 0);
1471 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1473 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1474 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1475 MODULE_LICENSE("GPL");
1476 MODULE_ALIAS_NETPROTO(PF_NETROM);
1478 static void __exit nr_exit(void)
1482 remove_proc_entry("nr", init_net.proc_net);
1483 remove_proc_entry("nr_neigh", init_net.proc_net);
1484 remove_proc_entry("nr_nodes", init_net.proc_net);
1485 nr_loopback_clear();
1489 #ifdef CONFIG_SYSCTL
1490 nr_unregister_sysctl();
1493 ax25_linkfail_release(&nr_linkfail_notifier);
1494 ax25_protocol_release(AX25_P_NETROM);
1496 unregister_netdevice_notifier(&nr_dev_notifier);
1498 sock_unregister(PF_NETROM);
1500 for (i = 0; i < nr_ndevs; i++) {
1501 struct net_device *dev = dev_nr[i];
1503 unregister_netdev(dev);
1509 proto_unregister(&nr_proto);
1511 module_exit(nr_exit);