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/*
* NET/ROM release 007
*
* This code REQUIRES 2.1.15 or higher/ NET3.038
*
* This module:
* This module is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* History
* NET/ROM 001 Jonathan(G4KLX) Cloned from the AX25 code.
* NET/ROM 002 Darryl(G7LED) Fixes and address enhancement.
* Jonathan(G4KLX) Complete bind re-think.
* Alan(GW4PTS) Trivial tweaks into new format.
* NET/ROM 003 Jonathan(G4KLX) Added G8BPQ extensions.
* Added NET/ROM routing ioctl.
* Darryl(G7LED) Fix autobinding (on connect).
* Fixed nr_release(), set TCP_CLOSE, wakeup app
* context, THEN make the sock dead.
* Circuit ID check before allocating it on
* a connection.
* Alan(GW4PTS) sendmsg/recvmsg only. Fixed connect clear bug
* inherited from AX.25
* NET/ROM 004 Jonathan(G4KLX) Converted to module.
* NET/ROM 005 Jonathan(G4KLX) Linux 2.1
* Alan(GW4PTS) Started POSIXisms
* NET/ROM 006 Alan(GW4PTS) Brought in line with the ANK changes
* Jonathan(G4KLX) Removed hdrincl.
* NET/ROM 007 Jonathan(G4KLX) New timer architecture.
* Impmented Idle timer.
* Arnaldo C. Melo s/suser/capable/, micro cleanups
* Jeroen (PE1RXQ) Use sock_orphan() on release.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/stat.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/termios.h> /* For TIOCINQ/OUTQ */
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <net/netrom.h>
#include <linux/proc_fs.h>
#include <net/ip.h>
#include <net/arp.h>
#include <linux/init.h>
int nr_ndevs = 4;
int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL;
int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS;
int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL;
int sysctl_netrom_transport_timeout = NR_DEFAULT_T1;
int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2;
int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2;
int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4;
int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW;
int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE;
int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING;
int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS;
static unsigned short circuit = 0x101;
static struct sock *volatile nr_list;
static struct proto_ops nr_proto_ops;
static void nr_free_sock(struct sock *sk)
{
sk_free(sk);
MOD_DEC_USE_COUNT;
}
static struct sock *nr_alloc_sock(void)
{
struct sock *sk;
nr_cb *nr;
if ((sk = sk_alloc(PF_NETROM, GFP_ATOMIC, 1)) == NULL)
return NULL;
if ((nr = kmalloc(sizeof(*nr), GFP_ATOMIC)) == NULL) {
sk_free(sk);
return NULL;
}
MOD_INC_USE_COUNT;
memset(nr, 0x00, sizeof(*nr));
sk->protinfo.nr = nr;
nr->sk = sk;
return sk;
}
/*
* Socket removal during an interrupt is now safe.
*/
static void nr_remove_socket(struct sock *sk)
{
struct sock *s;
unsigned long flags;
save_flags(flags); cli();
if ((s = nr_list) == sk) {
nr_list = s->next;
restore_flags(flags);
return;
}
while (s != NULL && s->next != NULL) {
if (s->next == sk) {
s->next = sk->next;
restore_flags(flags);
return;
}
s = s->next;
}
restore_flags(flags);
}
/*
* Kill all bound sockets on a dropped device.
*/
static void nr_kill_by_device(struct net_device *dev)
{
struct sock *s;
for (s = nr_list; s != NULL; s = s->next) {
if (s->protinfo.nr->device == dev)
nr_disconnect(s, ENETUNREACH);
}
}
/*
* Handle device status changes.
*/
static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
{
struct net_device *dev = (struct net_device *)ptr;
if (event != NETDEV_DOWN)
return NOTIFY_DONE;
nr_kill_by_device(dev);
nr_rt_device_down(dev);
return NOTIFY_DONE;
}
/*
* Add a socket to the bound sockets list.
*/
static void nr_insert_socket(struct sock *sk)
{
unsigned long flags;
save_flags(flags); cli();
sk->next = nr_list;
nr_list = sk;
restore_flags(flags);
}
/*
* Find a socket that wants to accept the Connect Request we just
* received.
*/
static struct sock *nr_find_listener(ax25_address *addr)
{
unsigned long flags;
struct sock *s;
save_flags(flags);
cli();
for (s = nr_list; s != NULL; s = s->next) {
if (ax25cmp(&s->protinfo.nr->source_addr, addr) == 0 && s->state == TCP_LISTEN) {
restore_flags(flags);
return s;
}
}
restore_flags(flags);
return NULL;
}
/*
* Find a connected NET/ROM socket given my circuit IDs.
*/
static struct sock *nr_find_socket(unsigned char index, unsigned char id)
{
struct sock *s;
unsigned long flags;
save_flags(flags);
cli();
for (s = nr_list; s != NULL; s = s->next) {
if (s->protinfo.nr->my_index == index && s->protinfo.nr->my_id == id) {
restore_flags(flags);
return s;
}
}
restore_flags(flags);
return NULL;
}
/*
* Find a connected NET/ROM socket given their circuit IDs.
*/
static struct sock *nr_find_peer(unsigned char index, unsigned char id, ax25_address *dest)
{
struct sock *s;
unsigned long flags;
save_flags(flags);
cli();
for (s = nr_list; s != NULL; s = s->next) {
if (s->protinfo.nr->your_index == index && s->protinfo.nr->your_id == id && ax25cmp(&s->protinfo.nr->dest_addr, dest) == 0) {
restore_flags(flags);
return s;
}
}
restore_flags(flags);
return NULL;
}
/*
* Find next free circuit ID.
*/
static unsigned short nr_find_next_circuit(void)
{
unsigned short id = circuit;
unsigned char i, j;
for (;;) {
i = id / 256;
j = id % 256;
if (i != 0 && j != 0)
if (nr_find_socket(i, j) == NULL)
break;
id++;
}
return id;
}
/*
* Deferred destroy.
*/
void nr_destroy_socket(struct sock *);
/*
* Handler for deferred kills.
*/
static void nr_destroy_timer(unsigned long data)
{
nr_destroy_socket((struct sock *)data);
}
/*
* This is called from user mode and the timers. Thus it protects itself against
* interrupt users but doesn't worry about being called during work.
* Once it is removed from the queue no interrupt or bottom half will
* touch it and we are (fairly 8-) ) safe.
*/
void nr_destroy_socket(struct sock *sk) /* Not static as it's used by the timer */
{
struct sk_buff *skb;
unsigned long flags;
save_flags(flags); cli();
nr_stop_heartbeat(sk);
nr_stop_t1timer(sk);
nr_stop_t2timer(sk);
nr_stop_t4timer(sk);
nr_stop_idletimer(sk);
nr_remove_socket(sk);
nr_clear_queues(sk); /* Flush the queues */
while ((skb = skb_dequeue(&sk->receive_queue)) != NULL) {
if (skb->sk != sk) { /* A pending connection */
skb->sk->dead = 1; /* Queue the unaccepted socket for death */
nr_start_heartbeat(skb->sk);
skb->sk->protinfo.nr->state = NR_STATE_0;
}
kfree_skb(skb);
}
if (atomic_read(&sk->wmem_alloc) != 0 || atomic_read(&sk->rmem_alloc) != 0) {
/* Defer: outstanding buffers */
init_timer(&sk->timer);
sk->timer.expires = jiffies + 10 * HZ;
sk->timer.function = nr_destroy_timer;
sk->timer.data = (unsigned long)sk;
add_timer(&sk->timer);
} else {
nr_free_sock(sk);
}
restore_flags(flags);
}
/*
* Handling for system calls applied via the various interfaces to a
* NET/ROM socket object.
*/
static int nr_setsockopt(struct socket *sock, int level, int optname,
char *optval, int optlen)
{
struct sock *sk = sock->sk;
int opt;
if (level != SOL_NETROM)
return -ENOPROTOOPT;
if (optlen < sizeof(int))
return -EINVAL;
if (get_user(opt, (int *)optval))
return -EFAULT;
switch (optname) {
case NETROM_T1:
if (opt < 1)
return -EINVAL;
sk->protinfo.nr->t1 = opt * HZ;
return 0;
case NETROM_T2:
if (opt < 1)
return -EINVAL;
sk->protinfo.nr->t2 = opt * HZ;
return 0;
case NETROM_N2:
if (opt < 1 || opt > 31)
return -EINVAL;
sk->protinfo.nr->n2 = opt;
return 0;
case NETROM_T4:
if (opt < 1)
return -EINVAL;
sk->protinfo.nr->t4 = opt * HZ;
return 0;
case NETROM_IDLE:
if (opt < 0)
return -EINVAL;
sk->protinfo.nr->idle = opt * 60 * HZ;
return 0;
default:
return -ENOPROTOOPT;
}
}
static int nr_getsockopt(struct socket *sock, int level, int optname,
char *optval, int *optlen)
{
struct sock *sk = sock->sk;
int val = 0;
int len;
if (level != SOL_NETROM)
return -ENOPROTOOPT;
if (get_user(len, optlen))
return -EFAULT;
if (len < 0)
return -EINVAL;
switch (optname) {
case NETROM_T1:
val = sk->protinfo.nr->t1 / HZ;
break;
case NETROM_T2:
val = sk->protinfo.nr->t2 / HZ;
break;
case NETROM_N2:
val = sk->protinfo.nr->n2;
break;
case NETROM_T4:
val = sk->protinfo.nr->t4 / HZ;
break;
case NETROM_IDLE:
val = sk->protinfo.nr->idle / (60 * HZ);
break;
default:
return -ENOPROTOOPT;
}
len = min_t(unsigned int, len, sizeof(int));
if (put_user(len, optlen))
return -EFAULT;
return copy_to_user(optval, &val, len) ? -EFAULT : 0;
}
static int nr_listen(struct socket *sock, int backlog)
{
struct sock *sk = sock->sk;
if (sk->state != TCP_LISTEN) {
memset(&sk->protinfo.nr->user_addr, '\0', AX25_ADDR_LEN);
sk->max_ack_backlog = backlog;
sk->state = TCP_LISTEN;
return 0;
}
return -EOPNOTSUPP;
}
static int nr_create(struct socket *sock, int protocol)
{
struct sock *sk;
nr_cb *nr;
if (sock->type != SOCK_SEQPACKET || protocol != 0)
return -ESOCKTNOSUPPORT;
if ((sk = nr_alloc_sock()) == NULL)
return -ENOMEM;
nr = sk->protinfo.nr;
sock_init_data(sock, sk);
sock->ops = &nr_proto_ops;
sk->protocol = protocol;
skb_queue_head_init(&nr->ack_queue);
skb_queue_head_init(&nr->reseq_queue);
skb_queue_head_init(&nr->frag_queue);
init_timer(&nr->t1timer);
init_timer(&nr->t2timer);
init_timer(&nr->t4timer);
init_timer(&nr->idletimer);
nr->t1 = sysctl_netrom_transport_timeout;
nr->t2 = sysctl_netrom_transport_acknowledge_delay;
nr->n2 = sysctl_netrom_transport_maximum_tries;
nr->t4 = sysctl_netrom_transport_busy_delay;
nr->idle = sysctl_netrom_transport_no_activity_timeout;
nr->window = sysctl_netrom_transport_requested_window_size;
nr->bpqext = 1;
nr->state = NR_STATE_0;
return 0;
}
static struct sock *nr_make_new(struct sock *osk)
{
struct sock *sk;
nr_cb *nr;
if (osk->type != SOCK_SEQPACKET)
return NULL;
if ((sk = nr_alloc_sock()) == NULL)
return NULL;
nr = sk->protinfo.nr;
sock_init_data(NULL, sk);
sk->type = osk->type;
sk->socket = osk->socket;
sk->priority = osk->priority;
sk->protocol = osk->protocol;
sk->rcvbuf = osk->rcvbuf;
sk->sndbuf = osk->sndbuf;
sk->debug = osk->debug;
sk->state = TCP_ESTABLISHED;
sk->sleep = osk->sleep;
sk->zapped = osk->zapped;
skb_queue_head_init(&nr->ack_queue);
skb_queue_head_init(&nr->reseq_queue);
skb_queue_head_init(&nr->frag_queue);
init_timer(&nr->t1timer);
init_timer(&nr->t2timer);
init_timer(&nr->t4timer);
init_timer(&nr->idletimer);
nr->t1 = osk->protinfo.nr->t1;
nr->t2 = osk->protinfo.nr->t2;
nr->n2 = osk->protinfo.nr->n2;
nr->t4 = osk->protinfo.nr->t4;
nr->idle = osk->protinfo.nr->idle;
nr->window = osk->protinfo.nr->window;
nr->device = osk->protinfo.nr->device;
nr->bpqext = osk->protinfo.nr->bpqext;
return sk;
}
static int nr_release(struct socket *sock)
{
struct sock *sk = sock->sk;
if (sk == NULL) return 0;
switch (sk->protinfo.nr->state) {
case NR_STATE_0:
case NR_STATE_1:
case NR_STATE_2:
nr_disconnect(sk, 0);
nr_destroy_socket(sk);
break;
case NR_STATE_3:
nr_clear_queues(sk);
sk->protinfo.nr->n2count = 0;
nr_write_internal(sk, NR_DISCREQ);
nr_start_t1timer(sk);
nr_stop_t2timer(sk);
nr_stop_t4timer(sk);
nr_stop_idletimer(sk);
sk->protinfo.nr->state = NR_STATE_2;
sk->state = TCP_CLOSE;
sk->shutdown |= SEND_SHUTDOWN;
sk->state_change(sk);
sock_orphan(sk);
sk->destroy = 1;
break;
default:
sk->socket = NULL;
break;
}
sock->sk = NULL;
return 0;
}
static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
struct sock *sk = sock->sk;
struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
struct net_device *dev;
ax25_address *user, *source;
if (sk->zapped == 0)
return -EINVAL;
if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct
full_sockaddr_ax25))
return -EINVAL;
if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25)))
return -EINVAL;
if (addr->fsa_ax25.sax25_family != AF_NETROM)
return -EINVAL;
if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n");
return -EADDRNOTAVAIL;
}
/*
* Only the super user can set an arbitrary user callsign.
*/
if (addr->fsa_ax25.sax25_ndigis == 1) {
if (!capable(CAP_NET_BIND_SERVICE))
return -EACCES;
sk->protinfo.nr->user_addr = addr->fsa_digipeater[0];
sk->protinfo.nr->source_addr = addr->fsa_ax25.sax25_call;
} else {
source = &addr->fsa_ax25.sax25_call;
if ((user = ax25_findbyuid(current->euid)) == NULL) {
if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE))
return -EPERM;
user = source;
}
sk->protinfo.nr->user_addr = *user;
sk->protinfo.nr->source_addr = *source;
}
sk->protinfo.nr->device = dev;
nr_insert_socket(sk);
sk->zapped = 0;
SOCK_DEBUG(sk, "NET/ROM: socket is bound\n");
return 0;
}
static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
int addr_len, int flags)
{
struct sock *sk = sock->sk;
struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
ax25_address *user, *source = NULL;
struct net_device *dev;
if (sk->state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
sock->state = SS_CONNECTED;
return 0; /* Connect completed during a ERESTARTSYS event */
}
if (sk->state == TCP_CLOSE && sock->state == SS_CONNECTING) {
sock->state = SS_UNCONNECTED;
return -ECONNREFUSED;
}
if (sk->state == TCP_ESTABLISHED)
return -EISCONN; /* No reconnect on a seqpacket socket */
sk->state = TCP_CLOSE;
sock->state = SS_UNCONNECTED;
if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25))
return -EINVAL;
if (addr->sax25_family != AF_NETROM)
return -EINVAL;
if (sk->zapped) { /* Must bind first - autobinding in this may or may not work */
sk->zapped = 0;
if ((dev = nr_dev_first()) == NULL)
return -ENETUNREACH;
source = (ax25_address *)dev->dev_addr;
if ((user = ax25_findbyuid(current->euid)) == NULL) {
if (ax25_uid_policy && !capable(CAP_NET_ADMIN))
return -EPERM;
user = source;
}
sk->protinfo.nr->user_addr = *user;
sk->protinfo.nr->source_addr = *source;
sk->protinfo.nr->device = dev;
nr_insert_socket(sk); /* Finish the bind */
}
sk->protinfo.nr->dest_addr = addr->sax25_call;
circuit = nr_find_next_circuit();
sk->protinfo.nr->my_index = circuit / 256;
sk->protinfo.nr->my_id = circuit % 256;
circuit++;
/* Move to connecting socket, start sending Connect Requests */
sock->state = SS_CONNECTING;
sk->state = TCP_SYN_SENT;
nr_establish_data_link(sk);
sk->protinfo.nr->state = NR_STATE_1;
nr_start_heartbeat(sk);
/* Now the loop */
if (sk->state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
return -EINPROGRESS;
cli(); /* To avoid races on the sleep */
/*
* A Connect Ack with Choke or timeout or failed routing will go to closed.
*/
while (sk->state == TCP_SYN_SENT) {
interruptible_sleep_on(sk->sleep);
if (signal_pending(current)) {
sti();
return -ERESTARTSYS;
}
}
if (sk->state != TCP_ESTABLISHED) {
sti();
sock->state = SS_UNCONNECTED;
return sock_error(sk); /* Always set at this point */
}
sock->state = SS_CONNECTED;
sti();
return 0;
}
static int nr_accept(struct socket *sock, struct socket *newsock, int flags)
{
struct sock *sk;
struct sock *newsk;
struct sk_buff *skb;
if ((sk = sock->sk) == NULL)
return -EINVAL;
if (sk->type != SOCK_SEQPACKET)
return -EOPNOTSUPP;
if (sk->state != TCP_LISTEN)
return -EINVAL;
/*
* The write queue this time is holding sockets ready to use
* hooked into the SABM we saved
*/
do {
cli();
if ((skb = skb_dequeue(&sk->receive_queue)) == NULL) {
if (flags & O_NONBLOCK) {
sti();
return -EWOULDBLOCK;
}
interruptible_sleep_on(sk->sleep);
if (signal_pending(current)) {
sti();
return -ERESTARTSYS;
}
}
} while (skb == NULL);
newsk = skb->sk;
newsk->pair = NULL;
newsk->socket = newsock;
newsk->sleep = &newsock->wait;
sti();
/* Now attach up the new socket */
kfree_skb(skb);
sk->ack_backlog--;
newsock->sk = newsk;
return 0;
}
static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
int *uaddr_len, int peer)
{
struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
struct sock *sk = sock->sk;
if (peer != 0) {
if (sk->state != TCP_ESTABLISHED)
return -ENOTCONN;
sax->fsa_ax25.sax25_family = AF_NETROM;
sax->fsa_ax25.sax25_ndigis = 1;
sax->fsa_ax25.sax25_call = sk->protinfo.nr->user_addr;
sax->fsa_digipeater[0] = sk->protinfo.nr->dest_addr;
*uaddr_len = sizeof(struct full_sockaddr_ax25);
} else {
sax->fsa_ax25.sax25_family = AF_NETROM;
sax->fsa_ax25.sax25_ndigis = 0;
sax->fsa_ax25.sax25_call = sk->protinfo.nr->source_addr;
*uaddr_len = sizeof(struct sockaddr_ax25);
}
return 0;
}
int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
{
struct sock *sk;
struct sock *make;
ax25_address *src, *dest, *user;
unsigned short circuit_index, circuit_id;
unsigned short peer_circuit_index, peer_circuit_id;
unsigned short frametype, flags, window, timeout;
skb->sk = NULL; /* Initially we don't know who it's for */
/*
* skb->data points to the netrom frame start
*/
src = (ax25_address *)(skb->data + 0);
dest = (ax25_address *)(skb->data + 7);
circuit_index = skb->data[15];
circuit_id = skb->data[16];
peer_circuit_index = skb->data[17];
peer_circuit_id = skb->data[18];
frametype = skb->data[19] & 0x0F;
flags = skb->data[19] & 0xF0;
switch (frametype) {
case NR_PROTOEXT:
#ifdef CONFIG_INET
/*
* Check for an incoming IP over NET/ROM frame.
*/
if (circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
skb->h.raw = skb->data;
return nr_rx_ip(skb, dev);
}
#endif
return 0;
case NR_CONNREQ:
case NR_CONNACK:
case NR_DISCREQ:
case NR_DISCACK:
case NR_INFO:
case NR_INFOACK:
/*
* These frame types we understand.
*/
break;
default:
/*
* Everything else is ignored.
*/
return 0;
}
/*
* Find an existing socket connection, based on circuit ID, if it's
* a Connect Request base it on their circuit ID.
*
* Circuit ID 0/0 is not valid but it could still be a "reset" for a
* circuit that no longer exists at the other end ...
*/
sk = NULL;
if (circuit_index == 0 && circuit_id == 0) {
if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
} else {
if (frametype == NR_CONNREQ)
sk = nr_find_peer(circuit_index, circuit_id, src);
else
sk = nr_find_socket(circuit_index, circuit_id);
}
if (sk != NULL) {
skb->h.raw = skb->data;
if (frametype == NR_CONNACK && skb->len == 22)
sk->protinfo.nr->bpqext = 1;
else
sk->protinfo.nr->bpqext = 0;
return nr_process_rx_frame(sk, skb);
}
/*
* Now it should be a CONNREQ.
*/
if (frametype != NR_CONNREQ) {
/*
* Here it would be nice to be able to send a reset but
* NET/ROM doesn't have one. The following hack would
* have been a way to extend the protocol but apparently
* it kills BPQ boxes... :-(
*/
#if 0
/*
* Never reply to a CONNACK/CHOKE.
*/
if (frametype != NR_CONNACK || flags != NR_CHOKE_FLAG)
nr_transmit_refusal(skb, 1);
#endif
return 0;
}
sk = nr_find_listener(dest);
user = (ax25_address *)(skb->data + 21);
if (sk == NULL || sk->ack_backlog == sk->max_ack_backlog || (make = nr_make_new(sk)) == NULL) {
nr_transmit_refusal(skb, 0);
return 0;
}
window = skb->data[20];
skb->sk = make;
make->state = TCP_ESTABLISHED;
/* Fill in his circuit details */
make->protinfo.nr->source_addr = *dest;
make->protinfo.nr->dest_addr = *src;
make->protinfo.nr->user_addr = *user;
make->protinfo.nr->your_index = circuit_index;
make->protinfo.nr->your_id = circuit_id;
circuit = nr_find_next_circuit();
make->protinfo.nr->my_index = circuit / 256;
make->protinfo.nr->my_id = circuit % 256;
circuit++;
/* Window negotiation */
if (window < make->protinfo.nr->window)
make->protinfo.nr->window = window;
/* L4 timeout negotiation */
if (skb->len == 37) {
timeout = skb->data[36] * 256 + skb->data[35];
if (timeout * HZ < make->protinfo.nr->t1)
make->protinfo.nr->t1 = timeout * HZ;
make->protinfo.nr->bpqext = 1;
} else {
make->protinfo.nr->bpqext = 0;
}
nr_write_internal(make, NR_CONNACK);
make->protinfo.nr->condition = 0x00;
make->protinfo.nr->vs = 0;
make->protinfo.nr->va = 0;
make->protinfo.nr->vr = 0;
make->protinfo.nr->vl = 0;
make->protinfo.nr->state = NR_STATE_3;
sk->ack_backlog++;
make->pair = sk;
nr_insert_socket(make);
skb_queue_head(&sk->receive_queue, skb);
nr_start_heartbeat(make);
nr_start_idletimer(make);
if (!sk->dead)
sk->data_ready(sk, skb->len);
return 1;
}
static int nr_sendmsg(struct socket *sock, struct msghdr *msg, int len, struct scm_cookie *scm)
{
struct sock *sk = sock->sk;
struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name;
int err;
struct sockaddr_ax25 sax;
struct sk_buff *skb;
unsigned char *asmptr;
int size;
if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR))
return -EINVAL;
if (sk->zapped)
return -EADDRNOTAVAIL;
if (sk->shutdown & SEND_SHUTDOWN) {
send_sig(SIGPIPE, current, 0);
return -EPIPE;
}
if (sk->protinfo.nr->device == NULL)
return -ENETUNREACH;
if (usax) {
if (msg->msg_namelen < sizeof(sax))
return -EINVAL;
sax = *usax;
if (ax25cmp(&sk->protinfo.nr->dest_addr, &sax.sax25_call) != 0)
return -EISCONN;
if (sax.sax25_family != AF_NETROM)
return -EINVAL;
} else {
if (sk->state != TCP_ESTABLISHED)
return -ENOTCONN;
sax.sax25_family = AF_NETROM;
sax.sax25_call = sk->protinfo.nr->dest_addr;
}
SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n");
/* Build a packet */
SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n");
size = len + AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
return err;
skb_reserve(skb, size - len);
/*
* Push down the NET/ROM header
*/
asmptr = skb_push(skb, NR_TRANSPORT_LEN);
SOCK_DEBUG(sk, "Building NET/ROM Header.\n");
/* Build a NET/ROM Transport header */
*asmptr++ = sk->protinfo.nr->your_index;
*asmptr++ = sk->protinfo.nr->your_id;
*asmptr++ = 0; /* To be filled in later */
*asmptr++ = 0; /* Ditto */
*asmptr++ = NR_INFO;
SOCK_DEBUG(sk, "Built header.\n");
/*
* Put the data on the end
*/
skb->h.raw = skb_put(skb, len);
asmptr = skb->h.raw;
SOCK_DEBUG(sk, "NET/ROM: Appending user data\n");
/* User data follows immediately after the NET/ROM transport header */
memcpy_fromiovec(asmptr, msg->msg_iov, len);
SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n");
if (sk->state != TCP_ESTABLISHED) {
kfree_skb(skb);
return -ENOTCONN;
}
nr_output(sk, skb); /* Shove it onto the queue */
return len;
}
static int nr_recvmsg(struct socket *sock, struct msghdr *msg, int size,
int flags, struct scm_cookie *scm)
{
struct sock *sk = sock->sk;
struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
int copied;
struct sk_buff *skb;
int er;
/*
* This works for seqpacket too. The receiver has ordered the queue for
* us! We do one quick check first though
*/
if (sk->state != TCP_ESTABLISHED)
return -ENOTCONN;
/* Now we can treat all alike */
if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL)
return er;
skb->h.raw = skb->data;
copied = skb->len;
if (copied > size) {
copied = size;
msg->msg_flags |= MSG_TRUNC;
}
skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
if (sax != NULL) {
sax->sax25_family = AF_NETROM;
memcpy(sax->sax25_call.ax25_call, skb->data + 7, AX25_ADDR_LEN);
}
msg->msg_namelen = sizeof(*sax);
skb_free_datagram(sk, skb);
return copied;
}
static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
struct sock *sk = sock->sk;
switch (cmd) {
case TIOCOUTQ: {
long amount;
amount = sk->sndbuf - atomic_read(&sk->wmem_alloc);
if (amount < 0)
amount = 0;
return put_user(amount, (int *)arg);
}
case TIOCINQ: {
struct sk_buff *skb;
long amount = 0L;
/* These two are safe on a single CPU system as only user tasks fiddle here */
if ((skb = skb_peek(&sk->receive_queue)) != NULL)
amount = skb->len;
return put_user(amount, (int *)arg);
}
case SIOCGSTAMP:
if (sk != NULL) {
if (sk->stamp.tv_sec == 0)
return -ENOENT;
return copy_to_user((void *)arg, &sk->stamp, sizeof(struct timeval)) ? -EFAULT : 0;
}
return -EINVAL;
case SIOCGIFADDR:
case SIOCSIFADDR:
case SIOCGIFDSTADDR:
case SIOCSIFDSTADDR:
case SIOCGIFBRDADDR:
case SIOCSIFBRDADDR:
case SIOCGIFNETMASK:
case SIOCSIFNETMASK:
case SIOCGIFMETRIC:
case SIOCSIFMETRIC:
return -EINVAL;
case SIOCADDRT:
case SIOCDELRT:
case SIOCNRDECOBS:
if (!capable(CAP_NET_ADMIN)) return -EPERM;
return nr_rt_ioctl(cmd, (void *)arg);
default:
return dev_ioctl(cmd, (void *)arg);
}
/*NOTREACHED*/
return 0;
}
static int nr_get_info(char *buffer, char **start, off_t offset, int length)
{
struct sock *s;
struct net_device *dev;
const char *devname;
int len = 0;
off_t pos = 0;
off_t begin = 0;
cli();
len += sprintf(buffer, "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");
for (s = nr_list; s != NULL; s = s->next) {
if ((dev = s->protinfo.nr->device) == NULL)
devname = "???";
else
devname = dev->name;
len += sprintf(buffer + len, "%-9s ",
ax2asc(&s->protinfo.nr->user_addr));
len += sprintf(buffer + len, "%-9s ",
ax2asc(&s->protinfo.nr->dest_addr));
len += sprintf(buffer + len, "%-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",
ax2asc(&s->protinfo.nr->source_addr),
devname,
s->protinfo.nr->my_index,
s->protinfo.nr->my_id,
s->protinfo.nr->your_index,
s->protinfo.nr->your_id,
s->protinfo.nr->state,
s->protinfo.nr->vs,
s->protinfo.nr->vr,
s->protinfo.nr->va,
ax25_display_timer(&s->protinfo.nr->t1timer) / HZ,
s->protinfo.nr->t1 / HZ,
ax25_display_timer(&s->protinfo.nr->t2timer) / HZ,
s->protinfo.nr->t2 / HZ,
ax25_display_timer(&s->protinfo.nr->t4timer) / HZ,
s->protinfo.nr->t4 / HZ,
ax25_display_timer(&s->protinfo.nr->idletimer) / (60 * HZ),
s->protinfo.nr->idle / (60 * HZ),
s->protinfo.nr->n2count,
s->protinfo.nr->n2,
s->protinfo.nr->window,
atomic_read(&s->wmem_alloc),
atomic_read(&s->rmem_alloc),
s->socket != NULL ? s->socket->inode->i_ino : 0L);
pos = begin + len;
if (pos < offset) {
len = 0;
begin = pos;
}
if (pos > offset + length)
break;
}
sti();
*start = buffer + (offset - begin);
len -= (offset - begin);
if (len > length) len = length;
return(len);
}
static struct net_proto_family nr_family_ops = {
family: PF_NETROM,
create: nr_create,
};
static struct proto_ops SOCKOPS_WRAPPED(nr_proto_ops) = {
family: PF_NETROM,
release: nr_release,
bind: nr_bind,
connect: nr_connect,
socketpair: sock_no_socketpair,
accept: nr_accept,
getname: nr_getname,
poll: datagram_poll,
ioctl: nr_ioctl,
listen: nr_listen,
shutdown: sock_no_shutdown,
setsockopt: nr_setsockopt,
getsockopt: nr_getsockopt,
sendmsg: nr_sendmsg,
recvmsg: nr_recvmsg,
mmap: sock_no_mmap,
sendpage: sock_no_sendpage,
};
#include <linux/smp_lock.h>
SOCKOPS_WRAP(nr_proto, PF_NETROM);
static struct notifier_block nr_dev_notifier = {
notifier_call: nr_device_event,
};
static struct net_device *dev_nr;
static char banner[] __initdata = KERN_INFO "G4KLX NET/ROM for Linux. Version 0.7 for AX25.037 Linux 2.4\n";
static int __init nr_proto_init(void)
{
int i;
if (nr_ndevs > 0x7fffffff/sizeof(struct net_device)) {
printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n");
return -1;
}
if ((dev_nr = kmalloc(nr_ndevs * sizeof(struct net_device), GFP_KERNEL)) == NULL) {
printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n");
return -1;
}
memset(dev_nr, 0x00, nr_ndevs * sizeof(struct net_device));
for (i = 0; i < nr_ndevs; i++) {
sprintf(dev_nr[i].name, "nr%d", i);
dev_nr[i].init = nr_init;
register_netdev(&dev_nr[i]);
}
sock_register(&nr_family_ops);
register_netdevice_notifier(&nr_dev_notifier);
printk(banner);
ax25_protocol_register(AX25_P_NETROM, nr_route_frame);
ax25_linkfail_register(nr_link_failed);
#ifdef CONFIG_SYSCTL
nr_register_sysctl();
#endif
nr_loopback_init();
proc_net_create("nr", 0, nr_get_info);
proc_net_create("nr_neigh", 0, nr_neigh_get_info);
proc_net_create("nr_nodes", 0, nr_nodes_get_info);
return 0;
}
module_init(nr_proto_init);
EXPORT_NO_SYMBOLS;
MODULE_PARM(nr_ndevs, "i");
MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
static void __exit nr_exit(void)
{
int i;
proc_net_remove("nr");
proc_net_remove("nr_neigh");
proc_net_remove("nr_nodes");
nr_loopback_clear();
nr_rt_free();
ax25_protocol_release(AX25_P_NETROM);
ax25_linkfail_release(nr_link_failed);
unregister_netdevice_notifier(&nr_dev_notifier);
#ifdef CONFIG_SYSCTL
nr_unregister_sysctl();
#endif
sock_unregister(PF_NETROM);
for (i = 0; i < nr_ndevs; i++) {
if (dev_nr[i].priv != NULL) {
kfree(dev_nr[i].priv);
dev_nr[i].priv = NULL;
unregister_netdev(&dev_nr[i]);
}
kfree(dev_nr[i].name);
}
kfree(dev_nr);
}
module_exit(nr_exit);
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