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/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/timer.h>
21 #include <linux/string.h>
22 #include <linux/sockios.h>
23 #include <linux/net.h>
24 #include <linux/stat.h>
26 #include <linux/inet.h>
27 #include <linux/netdevice.h>
28 #include <linux/if_arp.h>
29 #include <linux/skbuff.h>
30 #include <net/net_namespace.h>
32 #include <asm/uaccess.h>
33 #include <asm/system.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
;
78 * Socket removal during an interrupt is now safe.
80 static void nr_remove_socket(struct sock
*sk
)
82 spin_lock_bh(&nr_list_lock
);
84 spin_unlock_bh(&nr_list_lock
);
88 * Kill all bound sockets on a dropped device.
90 static void nr_kill_by_device(struct net_device
*dev
)
93 struct hlist_node
*node
;
95 spin_lock_bh(&nr_list_lock
);
96 sk_for_each(s
, node
, &nr_list
)
97 if (nr_sk(s
)->device
== dev
)
98 nr_disconnect(s
, ENETUNREACH
);
99 spin_unlock_bh(&nr_list_lock
);
103 * Handle device status changes.
105 static int nr_device_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
107 struct net_device
*dev
= (struct net_device
*)ptr
;
109 if (dev_net(dev
) != &init_net
)
112 if (event
!= NETDEV_DOWN
)
115 nr_kill_by_device(dev
);
116 nr_rt_device_down(dev
);
122 * Add a socket to the bound sockets list.
124 static void nr_insert_socket(struct sock
*sk
)
126 spin_lock_bh(&nr_list_lock
);
127 sk_add_node(sk
, &nr_list
);
128 spin_unlock_bh(&nr_list_lock
);
132 * Find a socket that wants to accept the Connect Request we just
135 static struct sock
*nr_find_listener(ax25_address
*addr
)
138 struct hlist_node
*node
;
140 spin_lock_bh(&nr_list_lock
);
141 sk_for_each(s
, node
, &nr_list
)
142 if (!ax25cmp(&nr_sk(s
)->source_addr
, addr
) &&
143 s
->sk_state
== TCP_LISTEN
) {
149 spin_unlock_bh(&nr_list_lock
);
154 * Find a connected NET/ROM socket given my circuit IDs.
156 static struct sock
*nr_find_socket(unsigned char index
, unsigned char id
)
159 struct hlist_node
*node
;
161 spin_lock_bh(&nr_list_lock
);
162 sk_for_each(s
, node
, &nr_list
) {
163 struct nr_sock
*nr
= nr_sk(s
);
165 if (nr
->my_index
== index
&& nr
->my_id
== id
) {
172 spin_unlock_bh(&nr_list_lock
);
177 * Find a connected NET/ROM socket given their circuit IDs.
179 static struct sock
*nr_find_peer(unsigned char index
, unsigned char id
,
183 struct hlist_node
*node
;
185 spin_lock_bh(&nr_list_lock
);
186 sk_for_each(s
, node
, &nr_list
) {
187 struct nr_sock
*nr
= nr_sk(s
);
189 if (nr
->your_index
== index
&& nr
->your_id
== id
&&
190 !ax25cmp(&nr
->dest_addr
, dest
)) {
197 spin_unlock_bh(&nr_list_lock
);
202 * Find next free circuit ID.
204 static unsigned short nr_find_next_circuit(void)
206 unsigned short id
= circuit
;
214 if (i
!= 0 && j
!= 0) {
215 if ((sk
=nr_find_socket(i
, j
)) == NULL
)
229 void nr_destroy_socket(struct sock
*);
232 * Handler for deferred kills.
234 static void nr_destroy_timer(unsigned long data
)
236 struct sock
*sk
=(struct sock
*)data
;
239 nr_destroy_socket(sk
);
245 * This is called from user mode and the timers. Thus it protects itself
246 * against interrupt users but doesn't worry about being called during
247 * work. Once it is removed from the queue no interrupt or bottom half
248 * will touch it and we are (fairly 8-) ) safe.
250 void nr_destroy_socket(struct sock
*sk
)
254 nr_remove_socket(sk
);
256 nr_stop_heartbeat(sk
);
260 nr_stop_idletimer(sk
);
262 nr_clear_queues(sk
); /* Flush the queues */
264 while ((skb
= skb_dequeue(&sk
->sk_receive_queue
)) != NULL
) {
265 if (skb
->sk
!= sk
) { /* A pending connection */
266 /* Queue the unaccepted socket for death */
267 sock_set_flag(skb
->sk
, SOCK_DEAD
);
268 nr_start_heartbeat(skb
->sk
);
269 nr_sk(skb
->sk
)->state
= NR_STATE_0
;
275 if (atomic_read(&sk
->sk_wmem_alloc
) ||
276 atomic_read(&sk
->sk_rmem_alloc
)) {
277 /* Defer: outstanding buffers */
278 sk
->sk_timer
.function
= nr_destroy_timer
;
279 sk
->sk_timer
.expires
= jiffies
+ 2 * HZ
;
280 add_timer(&sk
->sk_timer
);
286 * Handling for system calls applied via the various interfaces to a
287 * NET/ROM socket object.
290 static int nr_setsockopt(struct socket
*sock
, int level
, int optname
,
291 char __user
*optval
, int optlen
)
293 struct sock
*sk
= sock
->sk
;
294 struct nr_sock
*nr
= nr_sk(sk
);
297 if (level
!= SOL_NETROM
)
300 if (optlen
< sizeof(int))
303 if (get_user(opt
, (int __user
*)optval
))
320 if (opt
< 1 || opt
> 31)
334 nr
->idle
= opt
* 60 * HZ
;
342 static int nr_getsockopt(struct socket
*sock
, int level
, int optname
,
343 char __user
*optval
, int __user
*optlen
)
345 struct sock
*sk
= sock
->sk
;
346 struct nr_sock
*nr
= nr_sk(sk
);
350 if (level
!= SOL_NETROM
)
353 if (get_user(len
, optlen
))
377 val
= nr
->idle
/ (60 * HZ
);
384 len
= min_t(unsigned int, len
, sizeof(int));
386 if (put_user(len
, optlen
))
389 return copy_to_user(optval
, &val
, len
) ? -EFAULT
: 0;
392 static int nr_listen(struct socket
*sock
, int backlog
)
394 struct sock
*sk
= sock
->sk
;
397 if (sk
->sk_state
!= TCP_LISTEN
) {
398 memset(&nr_sk(sk
)->user_addr
, 0, AX25_ADDR_LEN
);
399 sk
->sk_max_ack_backlog
= backlog
;
400 sk
->sk_state
= TCP_LISTEN
;
409 static struct proto nr_proto
= {
411 .owner
= THIS_MODULE
,
412 .obj_size
= sizeof(struct nr_sock
),
415 static int nr_create(struct net
*net
, struct socket
*sock
, int protocol
)
420 if (net
!= &init_net
)
421 return -EAFNOSUPPORT
;
423 if (sock
->type
!= SOCK_SEQPACKET
|| protocol
!= 0)
424 return -ESOCKTNOSUPPORT
;
426 sk
= sk_alloc(net
, PF_NETROM
, GFP_ATOMIC
, &nr_proto
);
432 sock_init_data(sock
, sk
);
434 sock
->ops
= &nr_proto_ops
;
435 sk
->sk_protocol
= protocol
;
437 skb_queue_head_init(&nr
->ack_queue
);
438 skb_queue_head_init(&nr
->reseq_queue
);
439 skb_queue_head_init(&nr
->frag_queue
);
444 msecs_to_jiffies(sysctl_netrom_transport_timeout
);
446 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay
);
448 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries
);
450 msecs_to_jiffies(sysctl_netrom_transport_busy_delay
);
452 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout
);
453 nr
->window
= sysctl_netrom_transport_requested_window_size
;
456 nr
->state
= NR_STATE_0
;
461 static struct sock
*nr_make_new(struct sock
*osk
)
464 struct nr_sock
*nr
, *onr
;
466 if (osk
->sk_type
!= SOCK_SEQPACKET
)
469 sk
= sk_alloc(sock_net(osk
), PF_NETROM
, GFP_ATOMIC
, osk
->sk_prot
);
475 sock_init_data(NULL
, sk
);
477 sk
->sk_type
= osk
->sk_type
;
478 sk
->sk_priority
= osk
->sk_priority
;
479 sk
->sk_protocol
= osk
->sk_protocol
;
480 sk
->sk_rcvbuf
= osk
->sk_rcvbuf
;
481 sk
->sk_sndbuf
= osk
->sk_sndbuf
;
482 sk
->sk_state
= TCP_ESTABLISHED
;
483 sock_copy_flags(sk
, osk
);
485 skb_queue_head_init(&nr
->ack_queue
);
486 skb_queue_head_init(&nr
->reseq_queue
);
487 skb_queue_head_init(&nr
->frag_queue
);
497 nr
->idle
= onr
->idle
;
498 nr
->window
= onr
->window
;
500 nr
->device
= onr
->device
;
501 nr
->bpqext
= onr
->bpqext
;
506 static int nr_release(struct socket
*sock
)
508 struct sock
*sk
= sock
->sk
;
511 if (sk
== NULL
) return 0;
521 nr_disconnect(sk
, 0);
522 nr_destroy_socket(sk
);
528 nr_write_internal(sk
, NR_DISCREQ
);
529 nr_start_t1timer(sk
);
532 nr_stop_idletimer(sk
);
533 nr
->state
= NR_STATE_2
;
534 sk
->sk_state
= TCP_CLOSE
;
535 sk
->sk_shutdown
|= SEND_SHUTDOWN
;
536 sk
->sk_state_change(sk
);
538 sock_set_flag(sk
, SOCK_DESTROY
);
552 static int nr_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
)
554 struct sock
*sk
= sock
->sk
;
555 struct nr_sock
*nr
= nr_sk(sk
);
556 struct full_sockaddr_ax25
*addr
= (struct full_sockaddr_ax25
*)uaddr
;
557 struct net_device
*dev
;
558 ax25_uid_assoc
*user
;
559 ax25_address
*source
;
562 if (!sock_flag(sk
, SOCK_ZAPPED
)) {
566 if (addr_len
< sizeof(struct sockaddr_ax25
) || addr_len
> sizeof(struct full_sockaddr_ax25
)) {
570 if (addr_len
< (addr
->fsa_ax25
.sax25_ndigis
* sizeof(ax25_address
) + sizeof(struct sockaddr_ax25
))) {
574 if (addr
->fsa_ax25
.sax25_family
!= AF_NETROM
) {
578 if ((dev
= nr_dev_get(&addr
->fsa_ax25
.sax25_call
)) == NULL
) {
579 SOCK_DEBUG(sk
, "NET/ROM: bind failed: invalid node callsign\n");
581 return -EADDRNOTAVAIL
;
585 * Only the super user can set an arbitrary user callsign.
587 if (addr
->fsa_ax25
.sax25_ndigis
== 1) {
588 if (!capable(CAP_NET_BIND_SERVICE
)) {
593 nr
->user_addr
= addr
->fsa_digipeater
[0];
594 nr
->source_addr
= addr
->fsa_ax25
.sax25_call
;
596 source
= &addr
->fsa_ax25
.sax25_call
;
598 user
= ax25_findbyuid(current
->euid
);
600 nr
->user_addr
= user
->call
;
603 if (ax25_uid_policy
&& !capable(CAP_NET_BIND_SERVICE
)) {
608 nr
->user_addr
= *source
;
611 nr
->source_addr
= *source
;
615 nr_insert_socket(sk
);
617 sock_reset_flag(sk
, SOCK_ZAPPED
);
620 SOCK_DEBUG(sk
, "NET/ROM: socket is bound\n");
624 static int nr_connect(struct socket
*sock
, struct sockaddr
*uaddr
,
625 int addr_len
, int flags
)
627 struct sock
*sk
= sock
->sk
;
628 struct nr_sock
*nr
= nr_sk(sk
);
629 struct sockaddr_ax25
*addr
= (struct sockaddr_ax25
*)uaddr
;
630 ax25_address
*source
= NULL
;
631 ax25_uid_assoc
*user
;
632 struct net_device
*dev
;
636 if (sk
->sk_state
== TCP_ESTABLISHED
&& sock
->state
== SS_CONNECTING
) {
637 sock
->state
= SS_CONNECTED
;
638 goto out_release
; /* Connect completed during a ERESTARTSYS event */
641 if (sk
->sk_state
== TCP_CLOSE
&& sock
->state
== SS_CONNECTING
) {
642 sock
->state
= SS_UNCONNECTED
;
647 if (sk
->sk_state
== TCP_ESTABLISHED
) {
648 err
= -EISCONN
; /* No reconnect on a seqpacket socket */
652 sk
->sk_state
= TCP_CLOSE
;
653 sock
->state
= SS_UNCONNECTED
;
655 if (addr_len
!= sizeof(struct sockaddr_ax25
) && addr_len
!= sizeof(struct full_sockaddr_ax25
)) {
659 if (addr
->sax25_family
!= AF_NETROM
) {
663 if (sock_flag(sk
, SOCK_ZAPPED
)) { /* Must bind first - autobinding in this may or may not work */
664 sock_reset_flag(sk
, SOCK_ZAPPED
);
666 if ((dev
= nr_dev_first()) == NULL
) {
670 source
= (ax25_address
*)dev
->dev_addr
;
672 user
= ax25_findbyuid(current
->euid
);
674 nr
->user_addr
= user
->call
;
677 if (ax25_uid_policy
&& !capable(CAP_NET_ADMIN
)) {
682 nr
->user_addr
= *source
;
685 nr
->source_addr
= *source
;
689 nr_insert_socket(sk
); /* Finish the bind */
692 nr
->dest_addr
= addr
->sax25_call
;
695 circuit
= nr_find_next_circuit();
698 nr
->my_index
= circuit
/ 256;
699 nr
->my_id
= circuit
% 256;
703 /* Move to connecting socket, start sending Connect Requests */
704 sock
->state
= SS_CONNECTING
;
705 sk
->sk_state
= TCP_SYN_SENT
;
707 nr_establish_data_link(sk
);
709 nr
->state
= NR_STATE_1
;
711 nr_start_heartbeat(sk
);
714 if (sk
->sk_state
!= TCP_ESTABLISHED
&& (flags
& O_NONBLOCK
)) {
720 * A Connect Ack with Choke or timeout or failed routing will go to
723 if (sk
->sk_state
== TCP_SYN_SENT
) {
727 prepare_to_wait(sk
->sk_sleep
, &wait
,
729 if (sk
->sk_state
!= TCP_SYN_SENT
)
731 if (!signal_pending(current
)) {
740 finish_wait(sk
->sk_sleep
, &wait
);
745 if (sk
->sk_state
!= TCP_ESTABLISHED
) {
746 sock
->state
= SS_UNCONNECTED
;
747 err
= sock_error(sk
); /* Always set at this point */
751 sock
->state
= SS_CONNECTED
;
759 static int nr_accept(struct socket
*sock
, struct socket
*newsock
, int flags
)
767 if ((sk
= sock
->sk
) == NULL
)
771 if (sk
->sk_type
!= SOCK_SEQPACKET
) {
776 if (sk
->sk_state
!= TCP_LISTEN
) {
782 * The write queue this time is holding sockets ready to use
783 * hooked into the SABM we saved
786 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
787 skb
= skb_dequeue(&sk
->sk_receive_queue
);
791 if (flags
& O_NONBLOCK
) {
795 if (!signal_pending(current
)) {
804 finish_wait(sk
->sk_sleep
, &wait
);
809 sock_graft(newsk
, newsock
);
811 /* Now attach up the new socket */
813 sk_acceptq_removed(sk
);
821 static int nr_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
822 int *uaddr_len
, int peer
)
824 struct full_sockaddr_ax25
*sax
= (struct full_sockaddr_ax25
*)uaddr
;
825 struct sock
*sk
= sock
->sk
;
826 struct nr_sock
*nr
= nr_sk(sk
);
830 if (sk
->sk_state
!= TCP_ESTABLISHED
) {
834 sax
->fsa_ax25
.sax25_family
= AF_NETROM
;
835 sax
->fsa_ax25
.sax25_ndigis
= 1;
836 sax
->fsa_ax25
.sax25_call
= nr
->user_addr
;
837 sax
->fsa_digipeater
[0] = nr
->dest_addr
;
838 *uaddr_len
= sizeof(struct full_sockaddr_ax25
);
840 sax
->fsa_ax25
.sax25_family
= AF_NETROM
;
841 sax
->fsa_ax25
.sax25_ndigis
= 0;
842 sax
->fsa_ax25
.sax25_call
= nr
->source_addr
;
843 *uaddr_len
= sizeof(struct sockaddr_ax25
);
850 int nr_rx_frame(struct sk_buff
*skb
, struct net_device
*dev
)
854 struct nr_sock
*nr_make
;
855 ax25_address
*src
, *dest
, *user
;
856 unsigned short circuit_index
, circuit_id
;
857 unsigned short peer_circuit_index
, peer_circuit_id
;
858 unsigned short frametype
, flags
, window
, timeout
;
861 skb
->sk
= NULL
; /* Initially we don't know who it's for */
864 * skb->data points to the netrom frame start
867 src
= (ax25_address
*)(skb
->data
+ 0);
868 dest
= (ax25_address
*)(skb
->data
+ 7);
870 circuit_index
= skb
->data
[15];
871 circuit_id
= skb
->data
[16];
872 peer_circuit_index
= skb
->data
[17];
873 peer_circuit_id
= skb
->data
[18];
874 frametype
= skb
->data
[19] & 0x0F;
875 flags
= skb
->data
[19] & 0xF0;
878 * Check for an incoming IP over NET/ROM frame.
880 if (frametype
== NR_PROTOEXT
&&
881 circuit_index
== NR_PROTO_IP
&& circuit_id
== NR_PROTO_IP
) {
882 skb_pull(skb
, NR_NETWORK_LEN
+ NR_TRANSPORT_LEN
);
883 skb_reset_transport_header(skb
);
885 return nr_rx_ip(skb
, dev
);
889 * Find an existing socket connection, based on circuit ID, if it's
890 * a Connect Request base it on their circuit ID.
892 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
893 * circuit that no longer exists at the other end ...
898 if (circuit_index
== 0 && circuit_id
== 0) {
899 if (frametype
== NR_CONNACK
&& flags
== NR_CHOKE_FLAG
)
900 sk
= nr_find_peer(peer_circuit_index
, peer_circuit_id
, src
);
902 if (frametype
== NR_CONNREQ
)
903 sk
= nr_find_peer(circuit_index
, circuit_id
, src
);
905 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
);
922 * Now it should be a CONNREQ.
924 if (frametype
!= NR_CONNREQ
) {
926 * Here it would be nice to be able to send a reset but
927 * NET/ROM doesn't have one. We've tried to extend the protocol
928 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
929 * apparently kills BPQ boxes... :-(
930 * So now we try to follow the established behaviour of
931 * G8PZT's Xrouter which is sending packets with command type 7
932 * as an extension of the protocol.
934 if (sysctl_netrom_reset_circuit
&&
935 (frametype
!= NR_RESET
|| flags
!= 0))
936 nr_transmit_reset(skb
, 1);
941 sk
= nr_find_listener(dest
);
943 user
= (ax25_address
*)(skb
->data
+ 21);
945 if (sk
== NULL
|| sk_acceptq_is_full(sk
) ||
946 (make
= nr_make_new(sk
)) == NULL
) {
947 nr_transmit_refusal(skb
, 0);
953 window
= skb
->data
[20];
956 make
->sk_state
= TCP_ESTABLISHED
;
958 /* Fill in his circuit details */
959 nr_make
= nr_sk(make
);
960 nr_make
->source_addr
= *dest
;
961 nr_make
->dest_addr
= *src
;
962 nr_make
->user_addr
= *user
;
964 nr_make
->your_index
= circuit_index
;
965 nr_make
->your_id
= circuit_id
;
968 circuit
= nr_find_next_circuit();
971 nr_make
->my_index
= circuit
/ 256;
972 nr_make
->my_id
= circuit
% 256;
976 /* Window negotiation */
977 if (window
< nr_make
->window
)
978 nr_make
->window
= window
;
980 /* L4 timeout negotiation */
981 if (skb
->len
== 37) {
982 timeout
= skb
->data
[36] * 256 + skb
->data
[35];
983 if (timeout
* HZ
< nr_make
->t1
)
984 nr_make
->t1
= timeout
* HZ
;
990 nr_write_internal(make
, NR_CONNACK
);
992 nr_make
->condition
= 0x00;
997 nr_make
->state
= NR_STATE_3
;
998 sk_acceptq_added(sk
);
999 skb_queue_head(&sk
->sk_receive_queue
, skb
);
1001 if (!sock_flag(sk
, SOCK_DEAD
))
1002 sk
->sk_data_ready(sk
, skb
->len
);
1006 nr_insert_socket(make
);
1008 nr_start_heartbeat(make
);
1009 nr_start_idletimer(make
);
1014 static int nr_sendmsg(struct kiocb
*iocb
, struct socket
*sock
,
1015 struct msghdr
*msg
, size_t len
)
1017 struct sock
*sk
= sock
->sk
;
1018 struct nr_sock
*nr
= nr_sk(sk
);
1019 struct sockaddr_ax25
*usax
= (struct sockaddr_ax25
*)msg
->msg_name
;
1021 struct sockaddr_ax25 sax
;
1022 struct sk_buff
*skb
;
1023 unsigned char *asmptr
;
1026 if (msg
->msg_flags
& ~(MSG_DONTWAIT
|MSG_EOR
|MSG_CMSG_COMPAT
))
1030 if (sock_flag(sk
, SOCK_ZAPPED
)) {
1031 err
= -EADDRNOTAVAIL
;
1035 if (sk
->sk_shutdown
& SEND_SHUTDOWN
) {
1036 send_sig(SIGPIPE
, current
, 0);
1041 if (nr
->device
== NULL
) {
1047 if (msg
->msg_namelen
< sizeof(sax
)) {
1052 if (ax25cmp(&nr
->dest_addr
, &sax
.sax25_call
) != 0) {
1056 if (sax
.sax25_family
!= AF_NETROM
) {
1061 if (sk
->sk_state
!= TCP_ESTABLISHED
) {
1065 sax
.sax25_family
= AF_NETROM
;
1066 sax
.sax25_call
= nr
->dest_addr
;
1069 SOCK_DEBUG(sk
, "NET/ROM: sendto: Addresses built.\n");
1071 /* Build a packet */
1072 SOCK_DEBUG(sk
, "NET/ROM: sendto: building packet.\n");
1073 size
= len
+ NR_NETWORK_LEN
+ NR_TRANSPORT_LEN
;
1075 if ((skb
= sock_alloc_send_skb(sk
, size
, msg
->msg_flags
& MSG_DONTWAIT
, &err
)) == NULL
)
1078 skb_reserve(skb
, size
- len
);
1079 skb_reset_transport_header(skb
);
1082 * Push down the NET/ROM header
1085 asmptr
= skb_push(skb
, NR_TRANSPORT_LEN
);
1086 SOCK_DEBUG(sk
, "Building NET/ROM Header.\n");
1088 /* Build a NET/ROM Transport header */
1090 *asmptr
++ = nr
->your_index
;
1091 *asmptr
++ = nr
->your_id
;
1092 *asmptr
++ = 0; /* To be filled in later */
1093 *asmptr
++ = 0; /* Ditto */
1094 *asmptr
++ = NR_INFO
;
1095 SOCK_DEBUG(sk
, "Built header.\n");
1098 * Put the data on the end
1102 SOCK_DEBUG(sk
, "NET/ROM: Appending user data\n");
1104 /* User data follows immediately after the NET/ROM transport header */
1105 if (memcpy_fromiovec(skb_transport_header(skb
), msg
->msg_iov
, len
)) {
1111 SOCK_DEBUG(sk
, "NET/ROM: Transmitting buffer\n");
1113 if (sk
->sk_state
!= TCP_ESTABLISHED
) {
1119 nr_output(sk
, skb
); /* Shove it onto the queue */
1127 static int nr_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
1128 struct msghdr
*msg
, size_t size
, int flags
)
1130 struct sock
*sk
= sock
->sk
;
1131 struct sockaddr_ax25
*sax
= (struct sockaddr_ax25
*)msg
->msg_name
;
1133 struct sk_buff
*skb
;
1137 * This works for seqpacket too. The receiver has ordered the queue for
1138 * us! We do one quick check first though
1142 if (sk
->sk_state
!= TCP_ESTABLISHED
) {
1147 /* Now we can treat all alike */
1148 if ((skb
= skb_recv_datagram(sk
, flags
& ~MSG_DONTWAIT
, flags
& MSG_DONTWAIT
, &er
)) == NULL
) {
1153 skb_reset_transport_header(skb
);
1156 if (copied
> size
) {
1158 msg
->msg_flags
|= MSG_TRUNC
;
1161 skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1164 sax
->sax25_family
= AF_NETROM
;
1165 skb_copy_from_linear_data_offset(skb
, 7, sax
->sax25_call
.ax25_call
,
1169 msg
->msg_namelen
= sizeof(*sax
);
1171 skb_free_datagram(sk
, skb
);
1178 static int nr_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
1180 struct sock
*sk
= sock
->sk
;
1181 void __user
*argp
= (void __user
*)arg
;
1189 amount
= sk
->sk_sndbuf
- atomic_read(&sk
->sk_wmem_alloc
);
1193 return put_user(amount
, (int __user
*)argp
);
1197 struct sk_buff
*skb
;
1201 /* These two are safe on a single CPU system as only user tasks fiddle here */
1202 if ((skb
= skb_peek(&sk
->sk_receive_queue
)) != NULL
)
1205 return put_user(amount
, (int __user
*)argp
);
1210 ret
= sock_get_timestamp(sk
, argp
);
1216 ret
= sock_get_timestampns(sk
, argp
);
1222 case SIOCGIFDSTADDR
:
1223 case SIOCSIFDSTADDR
:
1224 case SIOCGIFBRDADDR
:
1225 case SIOCSIFBRDADDR
:
1226 case SIOCGIFNETMASK
:
1227 case SIOCSIFNETMASK
:
1235 if (!capable(CAP_NET_ADMIN
)) return -EPERM
;
1236 return nr_rt_ioctl(cmd
, argp
);
1239 return -ENOIOCTLCMD
;
1245 #ifdef CONFIG_PROC_FS
1247 static void *nr_info_start(struct seq_file
*seq
, loff_t
*pos
)
1250 struct hlist_node
*node
;
1253 spin_lock_bh(&nr_list_lock
);
1255 return SEQ_START_TOKEN
;
1257 sk_for_each(s
, node
, &nr_list
) {
1265 static void *nr_info_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
1269 return (v
== SEQ_START_TOKEN
) ? sk_head(&nr_list
)
1270 : sk_next((struct sock
*)v
);
1273 static void nr_info_stop(struct seq_file
*seq
, void *v
)
1275 spin_unlock_bh(&nr_list_lock
);
1278 static int nr_info_show(struct seq_file
*seq
, void *v
)
1281 struct net_device
*dev
;
1283 const char *devname
;
1286 if (v
== SEQ_START_TOKEN
)
1288 "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");
1295 if ((dev
= nr
->device
) == NULL
)
1298 devname
= dev
->name
;
1300 seq_printf(seq
, "%-9s ", ax2asc(buf
, &nr
->user_addr
));
1301 seq_printf(seq
, "%-9s ", ax2asc(buf
, &nr
->dest_addr
));
1303 "%-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",
1304 ax2asc(buf
, &nr
->source_addr
),
1314 ax25_display_timer(&nr
->t1timer
) / HZ
,
1316 ax25_display_timer(&nr
->t2timer
) / HZ
,
1318 ax25_display_timer(&nr
->t4timer
) / HZ
,
1320 ax25_display_timer(&nr
->idletimer
) / (60 * HZ
),
1321 nr
->idle
/ (60 * HZ
),
1325 atomic_read(&s
->sk_wmem_alloc
),
1326 atomic_read(&s
->sk_rmem_alloc
),
1327 s
->sk_socket
? SOCK_INODE(s
->sk_socket
)->i_ino
: 0L);
1334 static const struct seq_operations nr_info_seqops
= {
1335 .start
= nr_info_start
,
1336 .next
= nr_info_next
,
1337 .stop
= nr_info_stop
,
1338 .show
= nr_info_show
,
1341 static int nr_info_open(struct inode
*inode
, struct file
*file
)
1343 return seq_open(file
, &nr_info_seqops
);
1346 static const struct file_operations nr_info_fops
= {
1347 .owner
= THIS_MODULE
,
1348 .open
= nr_info_open
,
1350 .llseek
= seq_lseek
,
1351 .release
= seq_release
,
1353 #endif /* CONFIG_PROC_FS */
1355 static struct net_proto_family nr_family_ops
= {
1356 .family
= PF_NETROM
,
1357 .create
= nr_create
,
1358 .owner
= THIS_MODULE
,
1361 static const struct proto_ops nr_proto_ops
= {
1362 .family
= PF_NETROM
,
1363 .owner
= THIS_MODULE
,
1364 .release
= nr_release
,
1366 .connect
= nr_connect
,
1367 .socketpair
= sock_no_socketpair
,
1368 .accept
= nr_accept
,
1369 .getname
= nr_getname
,
1370 .poll
= datagram_poll
,
1372 .listen
= nr_listen
,
1373 .shutdown
= sock_no_shutdown
,
1374 .setsockopt
= nr_setsockopt
,
1375 .getsockopt
= nr_getsockopt
,
1376 .sendmsg
= nr_sendmsg
,
1377 .recvmsg
= nr_recvmsg
,
1378 .mmap
= sock_no_mmap
,
1379 .sendpage
= sock_no_sendpage
,
1382 static struct notifier_block nr_dev_notifier
= {
1383 .notifier_call
= nr_device_event
,
1386 static struct net_device
**dev_nr
;
1388 static struct ax25_protocol nr_pid
= {
1389 .pid
= AX25_P_NETROM
,
1390 .func
= nr_route_frame
1393 static struct ax25_linkfail nr_linkfail_notifier
= {
1394 .func
= nr_link_failed
,
1397 static int __init
nr_proto_init(void)
1400 int rc
= proto_register(&nr_proto
, 0);
1405 if (nr_ndevs
> 0x7fffffff/sizeof(struct net_device
*)) {
1406 printk(KERN_ERR
"NET/ROM: nr_proto_init - nr_ndevs parameter to large\n");
1410 dev_nr
= kzalloc(nr_ndevs
* sizeof(struct net_device
*), GFP_KERNEL
);
1411 if (dev_nr
== NULL
) {
1412 printk(KERN_ERR
"NET/ROM: nr_proto_init - unable to allocate device array\n");
1416 for (i
= 0; i
< nr_ndevs
; i
++) {
1417 char name
[IFNAMSIZ
];
1418 struct net_device
*dev
;
1420 sprintf(name
, "nr%d", i
);
1421 dev
= alloc_netdev(sizeof(struct nr_private
), name
, nr_setup
);
1423 printk(KERN_ERR
"NET/ROM: nr_proto_init - unable to allocate device structure\n");
1428 if (register_netdev(dev
)) {
1429 printk(KERN_ERR
"NET/ROM: nr_proto_init - unable to register network device\n");
1433 lockdep_set_class(&dev
->_xmit_lock
, &nr_netdev_xmit_lock_key
);
1437 if (sock_register(&nr_family_ops
)) {
1438 printk(KERN_ERR
"NET/ROM: nr_proto_init - unable to register socket family\n");
1442 register_netdevice_notifier(&nr_dev_notifier
);
1444 ax25_register_pid(&nr_pid
);
1445 ax25_linkfail_register(&nr_linkfail_notifier
);
1447 #ifdef CONFIG_SYSCTL
1448 nr_register_sysctl();
1453 proc_net_fops_create(&init_net
, "nr", S_IRUGO
, &nr_info_fops
);
1454 proc_net_fops_create(&init_net
, "nr_neigh", S_IRUGO
, &nr_neigh_fops
);
1455 proc_net_fops_create(&init_net
, "nr_nodes", S_IRUGO
, &nr_nodes_fops
);
1460 unregister_netdev(dev_nr
[i
]);
1461 free_netdev(dev_nr
[i
]);
1464 proto_unregister(&nr_proto
);
1469 module_init(nr_proto_init
);
1471 module_param(nr_ndevs
, int, 0);
1472 MODULE_PARM_DESC(nr_ndevs
, "number of NET/ROM devices");
1474 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1475 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1476 MODULE_LICENSE("GPL");
1477 MODULE_ALIAS_NETPROTO(PF_NETROM
);
1479 static void __exit
nr_exit(void)
1483 proc_net_remove(&init_net
, "nr");
1484 proc_net_remove(&init_net
, "nr_neigh");
1485 proc_net_remove(&init_net
, "nr_nodes");
1486 nr_loopback_clear();
1490 #ifdef CONFIG_SYSCTL
1491 nr_unregister_sysctl();
1494 ax25_linkfail_release(&nr_linkfail_notifier
);
1495 ax25_protocol_release(AX25_P_NETROM
);
1497 unregister_netdevice_notifier(&nr_dev_notifier
);
1499 sock_unregister(PF_NETROM
);
1501 for (i
= 0; i
< nr_ndevs
; i
++) {
1502 struct net_device
*dev
= dev_nr
[i
];
1504 unregister_netdev(dev
);
1510 proto_unregister(&nr_proto
);
1512 module_exit(nr_exit
);