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/*
* AX.25 release 038
*
* 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
* AX.25 006 Alan(GW4PTS) Nearly died of shock - it's working 8-)
* AX.25 007 Alan(GW4PTS) Removed the silliest bugs
* AX.25 008 Alan(GW4PTS) Cleaned up, fixed a few state machine problems, added callbacks
* AX.25 009 Alan(GW4PTS) Emergency patch kit to fix memory corruption
* AX.25 010 Alan(GW4PTS) Added RAW sockets/Digipeat.
* AX.25 011 Alan(GW4PTS) RAW socket and datagram fixes (thanks) - Raw sendto now gets PID right
* datagram sendto uses correct target address.
* AX.25 012 Alan(GW4PTS) Correct incoming connection handling, send DM to failed connects.
* Use skb->data not skb+1. Support sk->priority correctly.
* Correct receive on SOCK_DGRAM.
* AX.25 013 Alan(GW4PTS) Send DM to all unknown frames, missing initialiser fixed
* Leave spare SSID bits set (DAMA etc) - thanks for bug report,
* removed device registration (it's not used or needed). Clean up for
* gcc 2.5.8. PID to AX25_P_
* AX.25 014 Alan(GW4PTS) Cleanup and NET3 merge
* AX.25 015 Alan(GW4PTS) Internal test version.
* AX.25 016 Alan(GW4PTS) Semi Internal version for PI card
* work.
* AX.25 017 Alan(GW4PTS) Fixed some small bugs reported by
* G4KLX
* AX.25 018 Alan(GW4PTS) Fixed a small error in SOCK_DGRAM
* AX.25 019 Alan(GW4PTS) Clean ups for the non INET kernel and device ioctls in AX.25
* AX.25 020 Jonathan(G4KLX) /proc support and other changes.
* AX.25 021 Alan(GW4PTS) Added AX25_T1, AX25_N2, AX25_T3 as requested.
* AX.25 022 Jonathan(G4KLX) More work on the ax25 auto router and /proc improved (again)!
* Alan(GW4PTS) Added TIOCINQ/OUTQ
* AX.25 023 Alan(GW4PTS) Fixed shutdown bug
* AX.25 023 Alan(GW4PTS) Linus changed timers
* AX.25 024 Alan(GW4PTS) Small bug fixes
* AX.25 025 Alan(GW4PTS) More fixes, Linux 1.1.51 compatibility stuff, timers again!
* AX.25 026 Alan(GW4PTS) Small state fix.
* AX.25 027 Alan(GW4PTS) Socket close crash fixes.
* AX.25 028 Alan(GW4PTS) Callsign control including settings per uid.
* Small bug fixes.
* Protocol set by sockets only.
* Small changes to allow for start of NET/ROM layer.
* AX.25 028a Jonathan(G4KLX) Changes to state machine.
* AX.25 028b Jonathan(G4KLX) Extracted ax25 control block
* from sock structure.
* AX.25 029 Alan(GW4PTS) Combined 028b and some KA9Q code
* Jonathan(G4KLX) and removed all the old Berkeley, added IP mode registration.
* Darryl(G7LED) stuff. Cross-port digipeating. Minor fixes and enhancements.
* Alan(GW4PTS) Missed suser() on axassociate checks
* AX.25 030 Alan(GW4PTS) Added variable length headers.
* Jonathan(G4KLX) Added BPQ Ethernet interface.
* Steven(GW7RRM) Added digi-peating control ioctl.
* Added extended AX.25 support.
* Added AX.25 frame segmentation.
* Darryl(G7LED) Changed connect(), recvfrom(), sendto() sockaddr/addrlen to
* fall inline with bind() and new policy.
* Moved digipeating ctl to new ax25_dev structs.
* Fixed ax25_release(), set TCP_CLOSE, wakeup app
* context, THEN make the sock dead.
* Alan(GW4PTS) Cleaned up for single recvmsg methods.
* Alan(GW4PTS) Fixed not clearing error on connect failure.
* AX.25 031 Jonathan(G4KLX) Added binding to any device.
* Joerg(DL1BKE) Added DAMA support, fixed (?) digipeating, fixed buffer locking
* for "virtual connect" mode... Result: Probably the
* "Most Buggiest Code You've Ever Seen" (TM)
* HaJo(DD8NE) Implementation of a T5 (idle) timer
* Joerg(DL1BKE) Renamed T5 to IDLE and changed behaviour:
* the timer gets reloaded on every received or transmitted
* I frame for IP or NETROM. The idle timer is not active
* on "vanilla AX.25" connections. Furthermore added PACLEN
* to provide AX.25-layer based fragmentation (like WAMPES)
* AX.25 032 Joerg(DL1BKE) Fixed DAMA timeout error.
* ax25_send_frame() limits the number of enqueued
* datagrams per socket.
* AX.25 033 Jonathan(G4KLX) Removed auto-router.
* Hans(PE1AYX) Converted to Module.
* Joerg(DL1BKE) Moved BPQ Ethernet to separate driver.
* AX.25 034 Jonathan(G4KLX) 2.1 changes
* Alan(GW4PTS) Small POSIXisations
* AX.25 035 Alan(GW4PTS) Started fixing to the new
* format.
* Hans(PE1AYX) Fixed interface to IP layer.
* Alan(GW4PTS) Added asynchronous support.
* Frederic(F1OAT) Support for pseudo-digipeating.
* Jonathan(G4KLX) Support for packet forwarding.
* AX.25 036 Jonathan(G4KLX) Major restructuring.
* Joerg(DL1BKE) Fixed DAMA Slave.
* Jonathan(G4KLX) Fix wildcard listen parameter setting.
* AX.25 037 Jonathan(G4KLX) New timer architecture.
* AX.25 038 Matthias(DG2FEF) Small fixes to the syscall interface to make kernel
* independent of AX25_MAX_DIGIS used by applications.
* Tomi(OH2BNS) Fixed ax25_getname().
* Joerg(DL1BKE) Starting to phase out the support for full_sockaddr_ax25
* with only 6 digipeaters and sockaddr_ax25 in ax25_bind(),
* ax25_connect() and ax25_sendmsg()
* Joerg(DL1BKE) Added support for SO_BINDTODEVICE
* Arnaldo C. Melo s/suser/capable(CAP_NET_ADMIN)/, some more cleanups
* Michal Ostrowski Module initialization cleanup.
* 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 <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 <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/netfilter.h>
#include <linux/sysctl.h>
#include <linux/init.h>
#include <net/ip.h>
#include <net/arp.h>
ax25_cb *volatile ax25_list;
static struct proto_ops ax25_proto_ops;
/*
* Free an allocated ax25 control block. This is done to centralise
* the MOD count code.
*/
void ax25_free_cb(ax25_cb *ax25)
{
if (ax25->digipeat != NULL) {
kfree(ax25->digipeat);
ax25->digipeat = NULL;
}
kfree(ax25);
MOD_DEC_USE_COUNT;
}
static void ax25_free_sock(struct sock *sk)
{
ax25_free_cb(sk->protinfo.ax25);
}
/*
* Socket removal during an interrupt is now safe.
*/
static void ax25_remove_socket(ax25_cb *ax25)
{
ax25_cb *s;
unsigned long flags;
save_flags(flags); cli();
if ((s = ax25_list) == ax25) {
ax25_list = s->next;
restore_flags(flags);
return;
}
while (s != NULL && s->next != NULL) {
if (s->next == ax25) {
s->next = ax25->next;
restore_flags(flags);
return;
}
s = s->next;
}
restore_flags(flags);
}
/*
* Kill all bound sockets on a dropped device.
*/
static void ax25_kill_by_device(struct net_device *dev)
{
ax25_dev *ax25_dev;
ax25_cb *s;
if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
return;
for (s = ax25_list; s != NULL; s = s->next) {
if (s->ax25_dev == ax25_dev) {
s->ax25_dev = NULL;
ax25_disconnect(s, ENETUNREACH);
}
}
}
/*
* Handle device status changes.
*/
static int ax25_device_event(struct notifier_block *this,unsigned long event, void *ptr)
{
struct net_device *dev = (struct net_device *)ptr;
/* Reject non AX.25 devices */
if (dev->type != ARPHRD_AX25)
return NOTIFY_DONE;
switch (event) {
case NETDEV_UP:
ax25_dev_device_up(dev);
break;
case NETDEV_DOWN:
ax25_kill_by_device(dev);
ax25_rt_device_down(dev);
ax25_dev_device_down(dev);
break;
default:
break;
}
return NOTIFY_DONE;
}
/*
* Add a socket to the bound sockets list.
*/
void ax25_insert_socket(ax25_cb *ax25)
{
unsigned long flags;
save_flags(flags);
cli();
ax25->next = ax25_list;
ax25_list = ax25;
restore_flags(flags);
}
/*
* Find a socket that wants to accept the SABM we have just
* received.
*/
struct sock *ax25_find_listener(ax25_address *addr, int digi, struct net_device *dev, int type)
{
unsigned long flags;
ax25_cb *s;
save_flags(flags);
cli();
for (s = ax25_list; s != NULL; s = s->next) {
if ((s->iamdigi && !digi) || (!s->iamdigi && digi))
continue;
if (s->sk != NULL && ax25cmp(&s->source_addr, addr) == 0 && s->sk->type == type && s->sk->state == TCP_LISTEN) {
/* If device is null we match any device */
if (s->ax25_dev == NULL || s->ax25_dev->dev == dev) {
restore_flags(flags);
return s->sk;
}
}
}
restore_flags(flags);
return NULL;
}
/*
* Find an AX.25 socket given both ends.
*/
struct sock *ax25_find_socket(ax25_address *my_addr, ax25_address *dest_addr, int type)
{
ax25_cb *s;
unsigned long flags;
save_flags(flags);
cli();
for (s = ax25_list; s != NULL; s = s->next) {
if (s->sk != NULL && ax25cmp(&s->source_addr, my_addr) == 0 && ax25cmp(&s->dest_addr, dest_addr) == 0 && s->sk->type == type) {
restore_flags(flags);
return s->sk;
}
}
restore_flags(flags);
return NULL;
}
/*
* Find an AX.25 control block given both ends. It will only pick up
* floating AX.25 control blocks or non Raw socket bound control blocks.
*/
ax25_cb *ax25_find_cb(ax25_address *src_addr, ax25_address *dest_addr, ax25_digi *digi, struct net_device *dev)
{
ax25_cb *s;
unsigned long flags;
save_flags(flags);
cli();
for (s = ax25_list; s != NULL; s = s->next) {
if (s->sk != NULL && s->sk->type != SOCK_SEQPACKET)
continue;
if (s->ax25_dev == NULL)
continue;
if (ax25cmp(&s->source_addr, src_addr) == 0 && ax25cmp(&s->dest_addr, dest_addr) == 0 && s->ax25_dev->dev == dev) {
if (digi != NULL && digi->ndigi != 0) {
if (s->digipeat == NULL)
continue;
if (ax25digicmp(s->digipeat, digi) != 0)
continue;
} else {
if (s->digipeat != NULL && s->digipeat->ndigi != 0)
continue;
}
restore_flags(flags);
return s;
}
}
restore_flags(flags);
return NULL;
}
/*
* Look for any matching address - RAW sockets can bind to arbitrary names
*/
struct sock *ax25_addr_match(ax25_address *addr)
{
unsigned long flags;
ax25_cb *s;
save_flags(flags);
cli();
for (s = ax25_list; s != NULL; s = s->next) {
if (s->sk != NULL && ax25cmp(&s->source_addr, addr) == 0 && s->sk->type == SOCK_RAW) {
restore_flags(flags);
return s->sk;
}
}
restore_flags(flags);
return NULL;
}
void ax25_send_to_raw(struct sock *sk, struct sk_buff *skb, int proto)
{
struct sk_buff *copy;
while (sk != NULL) {
if (sk->type == SOCK_RAW &&
sk->protocol == proto &&
atomic_read(&sk->rmem_alloc) <= sk->rcvbuf) {
if ((copy = skb_clone(skb, GFP_ATOMIC)) == NULL)
return;
if (sock_queue_rcv_skb(sk, copy) != 0)
kfree_skb(copy);
}
sk = sk->next;
}
}
/*
* Deferred destroy.
*/
void ax25_destroy_socket(ax25_cb *);
/*
* Handler for deferred kills.
*/
static void ax25_destroy_timer(unsigned long data)
{
ax25_destroy_socket((ax25_cb *)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 ax25_destroy_socket(ax25_cb *ax25) /* Not static as it's used by the timer */
{
struct sk_buff *skb;
unsigned long flags;
save_flags(flags); cli();
ax25_stop_heartbeat(ax25);
ax25_stop_t1timer(ax25);
ax25_stop_t2timer(ax25);
ax25_stop_t3timer(ax25);
ax25_stop_idletimer(ax25);
ax25_remove_socket(ax25);
ax25_clear_queues(ax25); /* Flush the queues */
if (ax25->sk != NULL) {
while ((skb = skb_dequeue(&ax25->sk->receive_queue)) != NULL) {
if (skb->sk != ax25->sk) { /* A pending connection */
skb->sk->dead = 1; /* Queue the unaccepted socket for death */
ax25_start_heartbeat(skb->sk->protinfo.ax25);
skb->sk->protinfo.ax25->state = AX25_STATE_0;
}
kfree_skb(skb);
}
}
if (ax25->sk != NULL) {
if (atomic_read(&ax25->sk->wmem_alloc) != 0 ||
atomic_read(&ax25->sk->rmem_alloc) != 0) {
/* Defer: outstanding buffers */
init_timer(&ax25->timer);
ax25->timer.expires = jiffies + 10 * HZ;
ax25->timer.function = ax25_destroy_timer;
ax25->timer.data = (unsigned long)ax25;
add_timer(&ax25->timer);
} else {
sk_free(ax25->sk);
}
} else {
ax25_free_cb(ax25);
}
restore_flags(flags);
}
/*
* dl1bke 960311: set parameters for existing AX.25 connections,
* includes a KILL command to abort any connection.
* VERY useful for debugging ;-)
*/
static int ax25_ctl_ioctl(const unsigned int cmd, void *arg)
{
struct ax25_ctl_struct ax25_ctl;
ax25_digi digi;
ax25_dev *ax25_dev;
ax25_cb *ax25;
unsigned int k;
if (copy_from_user(&ax25_ctl, arg, sizeof(ax25_ctl)))
return -EFAULT;
if ((ax25_dev = ax25_addr_ax25dev(&ax25_ctl.port_addr)) == NULL)
return -ENODEV;
if (ax25_ctl.digi_count > AX25_MAX_DIGIS)
return -EINVAL;
digi.ndigi = ax25_ctl.digi_count;
for (k = 0; k < digi.ndigi; k++)
digi.calls[k] = ax25_ctl.digi_addr[k];
if ((ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev)) == NULL)
return -ENOTCONN;
switch (ax25_ctl.cmd) {
case AX25_KILL:
ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
#ifdef CONFIG_AX25_DAMA_SLAVE
if (ax25_dev->dama.slave && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE)
ax25_dama_off(ax25);
#endif
ax25_disconnect(ax25, ENETRESET);
break;
case AX25_WINDOW:
if (ax25->modulus == AX25_MODULUS) {
if (ax25_ctl.arg < 1 || ax25_ctl.arg > 7)
return -EINVAL;
} else {
if (ax25_ctl.arg < 1 || ax25_ctl.arg > 63)
return -EINVAL;
}
ax25->window = ax25_ctl.arg;
break;
case AX25_T1:
if (ax25_ctl.arg < 1)
return -EINVAL;
ax25->rtt = (ax25_ctl.arg * HZ) / 2;
ax25->t1 = ax25_ctl.arg * HZ;
break;
case AX25_T2:
if (ax25_ctl.arg < 1)
return -EINVAL;
ax25->t2 = ax25_ctl.arg * HZ;
break;
case AX25_N2:
if (ax25_ctl.arg < 1 || ax25_ctl.arg > 31)
return -EINVAL;
ax25->n2count = 0;
ax25->n2 = ax25_ctl.arg;
break;
case AX25_T3:
if (ax25_ctl.arg < 0)
return -EINVAL;
ax25->t3 = ax25_ctl.arg * HZ;
break;
case AX25_IDLE:
if (ax25_ctl.arg < 0)
return -EINVAL;
ax25->idle = ax25_ctl.arg * 60 * HZ;
break;
case AX25_PACLEN:
if (ax25_ctl.arg < 16 || ax25_ctl.arg > 65535)
return -EINVAL;
ax25->paclen = ax25_ctl.arg;
break;
default:
return -EINVAL;
}
return 0;
}
/*
* Fill in a created AX.25 created control block with the default
* values for a particular device.
*/
void ax25_fillin_cb(ax25_cb *ax25, ax25_dev *ax25_dev)
{
ax25->ax25_dev = ax25_dev;
if (ax25->ax25_dev != NULL) {
ax25->rtt = ax25_dev->values[AX25_VALUES_T1] / 2;
ax25->t1 = ax25_dev->values[AX25_VALUES_T1];
ax25->t2 = ax25_dev->values[AX25_VALUES_T2];
ax25->t3 = ax25_dev->values[AX25_VALUES_T3];
ax25->n2 = ax25_dev->values[AX25_VALUES_N2];
ax25->paclen = ax25_dev->values[AX25_VALUES_PACLEN];
ax25->idle = ax25_dev->values[AX25_VALUES_IDLE];
ax25->backoff = ax25_dev->values[AX25_VALUES_BACKOFF];
if (ax25_dev->values[AX25_VALUES_AXDEFMODE]) {
ax25->modulus = AX25_EMODULUS;
ax25->window = ax25_dev->values[AX25_VALUES_EWINDOW];
} else {
ax25->modulus = AX25_MODULUS;
ax25->window = ax25_dev->values[AX25_VALUES_WINDOW];
}
} else {
ax25->rtt = AX25_DEF_T1 / 2;
ax25->t1 = AX25_DEF_T1;
ax25->t2 = AX25_DEF_T2;
ax25->t3 = AX25_DEF_T3;
ax25->n2 = AX25_DEF_N2;
ax25->paclen = AX25_DEF_PACLEN;
ax25->idle = AX25_DEF_IDLE;
ax25->backoff = AX25_DEF_BACKOFF;
if (AX25_DEF_AXDEFMODE) {
ax25->modulus = AX25_EMODULUS;
ax25->window = AX25_DEF_EWINDOW;
} else {
ax25->modulus = AX25_MODULUS;
ax25->window = AX25_DEF_WINDOW;
}
}
}
/*
* Create an empty AX.25 control block.
*/
ax25_cb *ax25_create_cb(void)
{
ax25_cb *ax25;
if ((ax25 = kmalloc(sizeof(*ax25), GFP_ATOMIC)) == NULL)
return NULL;
MOD_INC_USE_COUNT;
memset(ax25, 0x00, sizeof(*ax25));
skb_queue_head_init(&ax25->write_queue);
skb_queue_head_init(&ax25->frag_queue);
skb_queue_head_init(&ax25->ack_queue);
skb_queue_head_init(&ax25->reseq_queue);
init_timer(&ax25->timer);
init_timer(&ax25->t1timer);
init_timer(&ax25->t2timer);
init_timer(&ax25->t3timer);
init_timer(&ax25->idletimer);
ax25_fillin_cb(ax25, NULL);
ax25->state = AX25_STATE_0;
return ax25;
}
/*
* Handling for system calls applied via the various interfaces to an
* AX25 socket object
*/
static int ax25_setsockopt(struct socket *sock, int level, int optname, char *optval, int optlen)
{
struct sock *sk = sock->sk;
struct net_device *dev;
char devname[IFNAMSIZ];
int opt;
if (level != SOL_AX25)
return -ENOPROTOOPT;
if (optlen < sizeof(int))
return -EINVAL;
if (get_user(opt, (int *)optval))
return -EFAULT;
switch (optname) {
case AX25_WINDOW:
if (sk->protinfo.ax25->modulus == AX25_MODULUS) {
if (opt < 1 || opt > 7)
return -EINVAL;
} else {
if (opt < 1 || opt > 63)
return -EINVAL;
}
sk->protinfo.ax25->window = opt;
return 0;
case AX25_T1:
if (opt < 1)
return -EINVAL;
sk->protinfo.ax25->rtt = (opt * HZ) / 2;
sk->protinfo.ax25->t1 = opt * HZ;
return 0;
case AX25_T2:
if (opt < 1)
return -EINVAL;
sk->protinfo.ax25->t2 = opt * HZ;
return 0;
case AX25_N2:
if (opt < 1 || opt > 31)
return -EINVAL;
sk->protinfo.ax25->n2 = opt;
return 0;
case AX25_T3:
if (opt < 1)
return -EINVAL;
sk->protinfo.ax25->t3 = opt * HZ;
return 0;
case AX25_IDLE:
if (opt < 0)
return -EINVAL;
sk->protinfo.ax25->idle = opt * 60 * HZ;
return 0;
case AX25_BACKOFF:
if (opt < 0 || opt > 2)
return -EINVAL;
sk->protinfo.ax25->backoff = opt;
return 0;
case AX25_EXTSEQ:
sk->protinfo.ax25->modulus = opt ? AX25_EMODULUS : AX25_MODULUS;
return 0;
case AX25_PIDINCL:
sk->protinfo.ax25->pidincl = opt ? 1 : 0;
return 0;
case AX25_IAMDIGI:
sk->protinfo.ax25->iamdigi = opt ? 1 : 0;
return 0;
case AX25_PACLEN:
if (opt < 16 || opt > 65535)
return -EINVAL;
sk->protinfo.ax25->paclen = opt;
return 0;
case SO_BINDTODEVICE:
if (optlen > IFNAMSIZ) optlen=IFNAMSIZ;
if (copy_from_user(devname, optval, optlen))
return -EFAULT;
dev = dev_get_by_name(devname);
if (dev == NULL) return -ENODEV;
if (sk->type == SOCK_SEQPACKET &&
(sock->state != SS_UNCONNECTED || sk->state == TCP_LISTEN))
return -EADDRNOTAVAIL;
sk->protinfo.ax25->ax25_dev = ax25_dev_ax25dev(dev);
ax25_fillin_cb(sk->protinfo.ax25, sk->protinfo.ax25->ax25_dev);
return 0;
default:
return -ENOPROTOOPT;
}
}
static int ax25_getsockopt(struct socket *sock, int level, int optname, char *optval, int *optlen)
{
struct sock *sk = sock->sk;
struct ax25_dev *ax25_dev;
char devname[IFNAMSIZ];
void *valptr;
int val = 0;
int maxlen, length;
if (level != SOL_AX25)
return -ENOPROTOOPT;
if (get_user(maxlen, optlen))
return -EFAULT;
if (maxlen < 1)
return -EFAULT;
valptr = (void *) &val;
length = min_t(unsigned int, maxlen, sizeof(int));
switch (optname) {
case AX25_WINDOW:
val = sk->protinfo.ax25->window;
break;
case AX25_T1:
val = sk->protinfo.ax25->t1 / HZ;
break;
case AX25_T2:
val = sk->protinfo.ax25->t2 / HZ;
break;
case AX25_N2:
val = sk->protinfo.ax25->n2;
break;
case AX25_T3:
val = sk->protinfo.ax25->t3 / HZ;
break;
case AX25_IDLE:
val = sk->protinfo.ax25->idle / (60 * HZ);
break;
case AX25_BACKOFF:
val = sk->protinfo.ax25->backoff;
break;
case AX25_EXTSEQ:
val = (sk->protinfo.ax25->modulus == AX25_EMODULUS);
break;
case AX25_PIDINCL:
val = sk->protinfo.ax25->pidincl;
break;
case AX25_IAMDIGI:
val = sk->protinfo.ax25->iamdigi;
break;
case AX25_PACLEN:
val = sk->protinfo.ax25->paclen;
break;
case SO_BINDTODEVICE:
ax25_dev = sk->protinfo.ax25->ax25_dev;
if (ax25_dev != NULL && ax25_dev->dev != NULL) {
strncpy(devname, ax25_dev->dev->name, IFNAMSIZ);
length = min_t(unsigned int, strlen(ax25_dev->dev->name)+1, maxlen);
devname[length-1] = '\0';
} else {
*devname = '\0';
length = 1;
}
valptr = (void *) devname;
break;
default:
return -ENOPROTOOPT;
}
if (put_user(length, optlen))
return -EFAULT;
return copy_to_user(optval, valptr, length) ? -EFAULT : 0;
}
static int ax25_listen(struct socket *sock, int backlog)
{
struct sock *sk = sock->sk;
if (sk->type == SOCK_SEQPACKET && sk->state != TCP_LISTEN) {
sk->max_ack_backlog = backlog;
sk->state = TCP_LISTEN;
return 0;
}
return -EOPNOTSUPP;
}
int ax25_create(struct socket *sock, int protocol)
{
struct sock *sk;
ax25_cb *ax25;
switch (sock->type) {
case SOCK_DGRAM:
if (protocol == 0 || protocol == PF_AX25)
protocol = AX25_P_TEXT;
break;
case SOCK_SEQPACKET:
switch (protocol) {
case 0:
case PF_AX25: /* For CLX */
protocol = AX25_P_TEXT;
break;
case AX25_P_SEGMENT:
#ifdef CONFIG_INET
case AX25_P_ARP:
case AX25_P_IP:
#endif
#ifdef CONFIG_NETROM
case AX25_P_NETROM:
#endif
#ifdef CONFIG_ROSE
case AX25_P_ROSE:
#endif
return -ESOCKTNOSUPPORT;
#ifdef CONFIG_NETROM_MODULE
case AX25_P_NETROM:
if (ax25_protocol_is_registered(AX25_P_NETROM))
return -ESOCKTNOSUPPORT;
#endif
#ifdef CONFIG_ROSE_MODULE
case AX25_P_ROSE:
if (ax25_protocol_is_registered(AX25_P_ROSE))
return -ESOCKTNOSUPPORT;
#endif
default:
break;
}
break;
case SOCK_RAW:
break;
default:
return -ESOCKTNOSUPPORT;
}
if ((sk = sk_alloc(PF_AX25, GFP_ATOMIC, 1)) == NULL)
return -ENOMEM;
if ((ax25 = ax25_create_cb()) == NULL) {
sk_free(sk);
return -ENOMEM;
}
sock_init_data(sock, sk);
sk->destruct = ax25_free_sock;
sock->ops = &ax25_proto_ops;
sk->protocol = protocol;
ax25->sk = sk;
sk->protinfo.ax25 = ax25;
return 0;
}
struct sock *ax25_make_new(struct sock *osk, struct ax25_dev *ax25_dev)
{
struct sock *sk;
ax25_cb *ax25;
if ((sk = sk_alloc(PF_AX25, GFP_ATOMIC, 1)) == NULL)
return NULL;
if ((ax25 = ax25_create_cb()) == NULL) {
sk_free(sk);
return NULL;
}
switch (osk->type) {
case SOCK_DGRAM:
break;
case SOCK_SEQPACKET:
break;
default:
sk_free(sk);
ax25_free_cb(ax25);
return NULL;
}
sock_init_data(NULL, sk);
sk->destruct = ax25_free_sock;
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;
ax25->modulus = osk->protinfo.ax25->modulus;
ax25->backoff = osk->protinfo.ax25->backoff;
ax25->pidincl = osk->protinfo.ax25->pidincl;
ax25->iamdigi = osk->protinfo.ax25->iamdigi;
ax25->rtt = osk->protinfo.ax25->rtt;
ax25->t1 = osk->protinfo.ax25->t1;
ax25->t2 = osk->protinfo.ax25->t2;
ax25->t3 = osk->protinfo.ax25->t3;
ax25->n2 = osk->protinfo.ax25->n2;
ax25->idle = osk->protinfo.ax25->idle;
ax25->paclen = osk->protinfo.ax25->paclen;
ax25->window = osk->protinfo.ax25->window;
ax25->ax25_dev = ax25_dev;
ax25->source_addr = osk->protinfo.ax25->source_addr;
if (osk->protinfo.ax25->digipeat != NULL) {
if ((ax25->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
sk_free(sk);
return NULL;
}
memcpy(ax25->digipeat, osk->protinfo.ax25->digipeat, sizeof(ax25_digi));
}
sk->protinfo.ax25 = ax25;
ax25->sk = sk;
return sk;
}
static int ax25_release(struct socket *sock)
{
struct sock *sk = sock->sk;
if (sk == NULL) return 0;
if (sk->type == SOCK_SEQPACKET) {
switch (sk->protinfo.ax25->state) {
case AX25_STATE_0:
ax25_disconnect(sk->protinfo.ax25, 0);
ax25_destroy_socket(sk->protinfo.ax25);
break;
case AX25_STATE_1:
case AX25_STATE_2:
ax25_send_control(sk->protinfo.ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
ax25_disconnect(sk->protinfo.ax25, 0);
ax25_destroy_socket(sk->protinfo.ax25);
break;
case AX25_STATE_3:
case AX25_STATE_4:
ax25_clear_queues(sk->protinfo.ax25);
sk->protinfo.ax25->n2count = 0;
switch (sk->protinfo.ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
case AX25_PROTO_STD_SIMPLEX:
case AX25_PROTO_STD_DUPLEX:
ax25_send_control(sk->protinfo.ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
ax25_stop_t2timer(sk->protinfo.ax25);
ax25_stop_t3timer(sk->protinfo.ax25);
ax25_stop_idletimer(sk->protinfo.ax25);
break;
#ifdef CONFIG_AX25_DAMA_SLAVE
case AX25_PROTO_DAMA_SLAVE:
ax25_stop_t3timer(sk->protinfo.ax25);
ax25_stop_idletimer(sk->protinfo.ax25);
break;
#endif
}
ax25_calculate_t1(sk->protinfo.ax25);
ax25_start_t1timer(sk->protinfo.ax25);
sk->protinfo.ax25->state = AX25_STATE_2;
sk->state = TCP_CLOSE;
sk->shutdown |= SEND_SHUTDOWN;
sk->state_change(sk);
sock_orphan(sk);
sk->destroy = 1;
break;
default:
break;
}
} else {
sk->state = TCP_CLOSE;
sk->shutdown |= SEND_SHUTDOWN;
sk->state_change(sk);
sock_orphan(sk);
ax25_destroy_socket(sk->protinfo.ax25);
}
sock->sk = NULL;
sk->socket = NULL; /* Not used, but we should do this */
return 0;
}
/*
* We support a funny extension here so you can (as root) give any callsign
* digipeated via a local address as source. This hack is obsolete now
* that we've implemented support for SO_BINDTODEVICE. It is however small
* and trivially backward compatible.
*/
static int ax25_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;
ax25_address *call;
ax25_dev *ax25_dev = NULL;
if (sk->zapped == 0)
return -EINVAL;
if (addr_len != sizeof(struct sockaddr_ax25) &&
addr_len != sizeof(struct full_sockaddr_ax25)) {
/* support for old structure may go away some time */
if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
(addr_len > sizeof(struct full_sockaddr_ax25)))
return -EINVAL;
printk(KERN_WARNING "ax25_bind(): %s uses old (6 digipeater) socket structure.\n",
current->comm);
}
if (addr->fsa_ax25.sax25_family != AF_AX25)
return -EINVAL;
call = ax25_findbyuid(current->euid);
if (call == NULL && ax25_uid_policy && !capable(CAP_NET_ADMIN))
return -EACCES;
if (call == NULL)
sk->protinfo.ax25->source_addr = addr->fsa_ax25.sax25_call;
else
sk->protinfo.ax25->source_addr = *call;
/*
* User already set interface with SO_BINDTODEVICE
*/
if (sk->protinfo.ax25->ax25_dev != NULL)
goto done;
if (addr_len > sizeof(struct sockaddr_ax25) && addr->fsa_ax25.sax25_ndigis == 1) {
if (ax25cmp(&addr->fsa_digipeater[0], &null_ax25_address) != 0 &&
(ax25_dev = ax25_addr_ax25dev(&addr->fsa_digipeater[0])) == NULL)
return -EADDRNOTAVAIL;
} else {
if ((ax25_dev = ax25_addr_ax25dev(&addr->fsa_ax25.sax25_call)) == NULL)
return -EADDRNOTAVAIL;
}
if (ax25_dev != NULL)
ax25_fillin_cb(sk->protinfo.ax25, ax25_dev);
done:
ax25_insert_socket(sk->protinfo.ax25);
sk->zapped = 0;
return 0;
}
/*
* FIXME: nonblock behaviour looks like it may have a bug.
*/
static int ax25_connect(struct socket *sock, struct sockaddr *uaddr, int addr_len, int flags)
{
struct sock *sk = sock->sk;
struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
ax25_digi *digi = NULL;
int ct = 0, err;
/* deal with restarts */
if (sock->state == SS_CONNECTING) {
switch (sk->state) {
case TCP_SYN_SENT: /* still trying */
return -EINPROGRESS;
case TCP_ESTABLISHED: /* connection established */
sock->state = SS_CONNECTED;
return 0;
case TCP_CLOSE: /* connection refused */
sock->state = SS_UNCONNECTED;
return -ECONNREFUSED;
}
}
if (sk->state == TCP_ESTABLISHED && sk->type == SOCK_SEQPACKET)
return -EISCONN; /* No reconnect on a seqpacket socket */
sk->state = TCP_CLOSE;
sock->state = SS_UNCONNECTED;
/*
* some sanity checks. code further down depends on this
*/
if (addr_len == sizeof(struct sockaddr_ax25)) {
/* support for this will go away in early 2.5.x */
printk(KERN_WARNING "ax25_connect(): %s uses obsolete socket structure\n",
current->comm);
}
else if (addr_len != sizeof(struct full_sockaddr_ax25)) {
/* support for old structure may go away some time */
if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
(addr_len > sizeof(struct full_sockaddr_ax25)))
return -EINVAL;
printk(KERN_WARNING "ax25_connect(): %s uses old (6 digipeater) socket structure.\n",
current->comm);
}
if (fsa->fsa_ax25.sax25_family != AF_AX25)
return -EINVAL;
if (sk->protinfo.ax25->digipeat != NULL) {
kfree(sk->protinfo.ax25->digipeat);
sk->protinfo.ax25->digipeat = NULL;
}
/*
* Handle digi-peaters to be used.
*/
if (addr_len > sizeof(struct sockaddr_ax25) && fsa->fsa_ax25.sax25_ndigis != 0) {
/* Valid number of digipeaters ? */
if (fsa->fsa_ax25.sax25_ndigis < 1 || fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS)
return -EINVAL;
if ((digi = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL)
return -ENOBUFS;
digi->ndigi = fsa->fsa_ax25.sax25_ndigis;
digi->lastrepeat = -1;
while (ct < fsa->fsa_ax25.sax25_ndigis) {
if ((fsa->fsa_digipeater[ct].ax25_call[6] & AX25_HBIT) && sk->protinfo.ax25->iamdigi) {
digi->repeated[ct] = 1;
digi->lastrepeat = ct;
} else {
digi->repeated[ct] = 0;
}
digi->calls[ct] = fsa->fsa_digipeater[ct];
ct++;
}
}
/*
* Must bind first - autobinding in this may or may not work. If
* the socket is already bound, check to see if the device has
* been filled in, error if it hasn't.
*/
if (sk->zapped) {
/* check if we can remove this feature. It is broken. */
printk(KERN_WARNING "ax25_connect(): %s uses autobind, please contact jreuter@yaina.de\n",
current->comm);
if ((err = ax25_rt_autobind(sk->protinfo.ax25, &fsa->fsa_ax25.sax25_call)) < 0)
return err;
ax25_fillin_cb(sk->protinfo.ax25, sk->protinfo.ax25->ax25_dev);
ax25_insert_socket(sk->protinfo.ax25);
} else {
if (sk->protinfo.ax25->ax25_dev == NULL)
return -EHOSTUNREACH;
}
if (sk->type == SOCK_SEQPACKET && ax25_find_cb(&sk->protinfo.ax25->source_addr, &fsa->fsa_ax25.sax25_call, digi, sk->protinfo.ax25->ax25_dev->dev) != NULL) {
if (digi != NULL) kfree(digi);
return -EADDRINUSE; /* Already such a connection */
}
sk->protinfo.ax25->dest_addr = fsa->fsa_ax25.sax25_call;
sk->protinfo.ax25->digipeat = digi;
/* First the easy one */
if (sk->type != SOCK_SEQPACKET) {
sock->state = SS_CONNECTED;
sk->state = TCP_ESTABLISHED;
return 0;
}
/* Move to connecting socket, ax.25 lapb WAIT_UA.. */
sock->state = SS_CONNECTING;
sk->state = TCP_SYN_SENT;
switch (sk->protinfo.ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
case AX25_PROTO_STD_SIMPLEX:
case AX25_PROTO_STD_DUPLEX:
ax25_std_establish_data_link(sk->protinfo.ax25);
break;
#ifdef CONFIG_AX25_DAMA_SLAVE
case AX25_PROTO_DAMA_SLAVE:
sk->protinfo.ax25->modulus = AX25_MODULUS;
sk->protinfo.ax25->window = sk->protinfo.ax25->ax25_dev->values[AX25_VALUES_WINDOW];
if (sk->protinfo.ax25->ax25_dev->dama.slave)
ax25_ds_establish_data_link(sk->protinfo.ax25);
else
ax25_std_establish_data_link(sk->protinfo.ax25);
break;
#endif
}
sk->protinfo.ax25->state = AX25_STATE_1;
ax25_start_heartbeat(sk->protinfo.ax25);
/* Now the loop */
if (sk->state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
return -EINPROGRESS;
cli(); /* To avoid races on the sleep */
/* A DM or timeout will go to closed, a UA will go to ABM */
while (sk->state == TCP_SYN_SENT) {
interruptible_sleep_on(sk->sleep);
if (signal_pending(current)) {
sti();
return -ERESTARTSYS;
}
}
if (sk->state != TCP_ESTABLISHED) {
/* Not in ABM, not in WAIT_UA -> failed */
sti();
sock->state = SS_UNCONNECTED;
return sock_error(sk); /* Always set at this point */
}
sock->state = SS_CONNECTED;
sti();
return 0;
}
static int ax25_accept(struct socket *sock, struct socket *newsock, int flags)
{
struct sock *sk;
struct sock *newsk;
struct sk_buff *skb;
if (sock->state != SS_UNCONNECTED)
return -EINVAL;
if ((sk = sock->sk) == NULL)
return -EINVAL;
if (sk->type != SOCK_SEQPACKET)
return -EOPNOTSUPP;
if (sk->state != TCP_LISTEN)
return -EINVAL;
/*
* The read queue this time is holding sockets ready to use
* hooked into the SABM we saved
*/
do {
if ((skb = skb_dequeue(&sk->receive_queue)) == NULL) {
if (flags & O_NONBLOCK)
return -EWOULDBLOCK;
interruptible_sleep_on(sk->sleep);
if (signal_pending(current))
return -ERESTARTSYS;
}
} while (skb == NULL);
newsk = skb->sk;
newsk->pair = NULL;
newsk->socket = newsock;
newsk->sleep = &newsock->wait;
/* Now attach up the new socket */
kfree_skb(skb);
sk->ack_backlog--;
newsock->sk = newsk;
newsock->state = SS_CONNECTED;
return 0;
}
static int ax25_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer)
{
struct sock *sk = sock->sk;
struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
unsigned char ndigi, i;
if (peer != 0) {
if (sk->state != TCP_ESTABLISHED)
return -ENOTCONN;
fsa->fsa_ax25.sax25_family = AF_AX25;
fsa->fsa_ax25.sax25_call = sk->protinfo.ax25->dest_addr;
fsa->fsa_ax25.sax25_ndigis = 0;
if (sk->protinfo.ax25->digipeat != NULL) {
ndigi = sk->protinfo.ax25->digipeat->ndigi;
fsa->fsa_ax25.sax25_ndigis = ndigi;
for (i = 0; i < ndigi; i++)
fsa->fsa_digipeater[i] = sk->protinfo.ax25->digipeat->calls[i];
}
} else {
fsa->fsa_ax25.sax25_family = AF_AX25;
fsa->fsa_ax25.sax25_call = sk->protinfo.ax25->source_addr;
fsa->fsa_ax25.sax25_ndigis = 1;
if (sk->protinfo.ax25->ax25_dev != NULL) {
memcpy(&fsa->fsa_digipeater[0], sk->protinfo.ax25->ax25_dev->dev->dev_addr, AX25_ADDR_LEN);
} else {
fsa->fsa_digipeater[0] = null_ax25_address;
}
}
*uaddr_len = sizeof (struct full_sockaddr_ax25);
return 0;
}
static int ax25_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;
ax25_digi *dp;
ax25_digi dtmp;
int lv;
int addr_len = msg->msg_namelen;
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.ax25->ax25_dev == NULL)
return -ENETUNREACH;
if (usax != NULL) {
if (usax->sax25_family != AF_AX25)
return -EINVAL;
if (addr_len == sizeof(struct sockaddr_ax25)) {
printk(KERN_WARNING "ax25_sendmsg(): %s uses obsolete socket structure\n",
current->comm);
}
else if (addr_len != sizeof(struct full_sockaddr_ax25)) {
/* support for old structure may go away some time */
if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
(addr_len > sizeof(struct full_sockaddr_ax25)))
return -EINVAL;
printk(KERN_WARNING "ax25_sendmsg(): %s uses old (6 digipeater) socket structure.\n",
current->comm);
}
if (addr_len > sizeof(struct sockaddr_ax25) && usax->sax25_ndigis != 0) {
int ct = 0;
struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax;
/* Valid number of digipeaters ? */
if (usax->sax25_ndigis < 1 || usax->sax25_ndigis > AX25_MAX_DIGIS)
return -EINVAL;
dtmp.ndigi = usax->sax25_ndigis;
while (ct < usax->sax25_ndigis) {
dtmp.repeated[ct] = 0;
dtmp.calls[ct] = fsa->fsa_digipeater[ct];
ct++;
}
dtmp.lastrepeat = 0;
}
sax = *usax;
if (sk->type == SOCK_SEQPACKET && ax25cmp(&sk->protinfo.ax25->dest_addr, &sax.sax25_call) != 0)
return -EISCONN;
if (usax->sax25_ndigis == 0)
dp = NULL;
else
dp = &dtmp;
} else {
/*
* FIXME: 1003.1g - if the socket is like this because
* it has become closed (not started closed) and is VC
* we ought to SIGPIPE, EPIPE
*/
if (sk->state != TCP_ESTABLISHED)
return -ENOTCONN;
sax.sax25_family = AF_AX25;
sax.sax25_call = sk->protinfo.ax25->dest_addr;
dp = sk->protinfo.ax25->digipeat;
}
SOCK_DEBUG(sk, "AX.25: sendto: Addresses built.\n");
/* Build a packet */
SOCK_DEBUG(sk, "AX.25: sendto: building packet.\n");
/* Assume the worst case */
size = len + 3 + ax25_addr_size(dp) + AX25_BPQ_HEADER_LEN;
if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
return err;
skb_reserve(skb, size - len);
SOCK_DEBUG(sk, "AX.25: Appending user data\n");
/* User data follows immediately after the AX.25 data */
memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
skb->nh.raw = skb->data;
/* Add the PID if one is not supplied by the user in the skb */
if (!sk->protinfo.ax25->pidincl) {
asmptr = skb_push(skb, 1);
*asmptr = sk->protocol;
}
SOCK_DEBUG(sk, "AX.25: Transmitting buffer\n");
if (sk->type == SOCK_SEQPACKET) {
/* Connected mode sockets go via the LAPB machine */
if (sk->state != TCP_ESTABLISHED) {
kfree_skb(skb);
return -ENOTCONN;
}
ax25_output(sk->protinfo.ax25, sk->protinfo.ax25->paclen, skb); /* Shove it onto the queue and kick */
return len;
} else {
asmptr = skb_push(skb, 1 + ax25_addr_size(dp));
SOCK_DEBUG(sk, "Building AX.25 Header (dp=%p).\n", dp);
if (dp != NULL)
SOCK_DEBUG(sk, "Num digipeaters=%d\n", dp->ndigi);
/* Build an AX.25 header */
asmptr += (lv = ax25_addr_build(asmptr, &sk->protinfo.ax25->source_addr, &sax.sax25_call, dp, AX25_COMMAND, AX25_MODULUS));
SOCK_DEBUG(sk, "Built header (%d bytes)\n",lv);
skb->h.raw = asmptr;
SOCK_DEBUG(sk, "base=%p pos=%p\n", skb->data, asmptr);
*asmptr = AX25_UI;
/* Datagram frames go straight out of the door as UI */
skb->dev = sk->protinfo.ax25->ax25_dev->dev;
ax25_queue_xmit(skb);
return len;
}
}
static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, int size, int flags, struct scm_cookie *scm)
{
struct sock *sk = sock->sk;
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->type == SOCK_SEQPACKET && 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;
if (!sk->protinfo.ax25->pidincl)
skb_pull(skb, 1); /* Remove PID */
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 (msg->msg_namelen != 0) {
struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
ax25_digi digi;
ax25_address dest;
ax25_addr_parse(skb->mac.raw+1, skb->data-skb->mac.raw-1, NULL, &dest, &digi, NULL, NULL);
sax->sax25_family = AF_AX25;
/* We set this correctly, even though we may not let the
application know the digi calls further down (because it
did NOT ask to know them). This could get political... **/
sax->sax25_ndigis = digi.ndigi;
sax->sax25_call = dest;
if (sax->sax25_ndigis != 0) {
int ct;
struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)sax;
for (ct = 0; ct < digi.ndigi; ct++)
fsa->fsa_digipeater[ct] = digi.calls[ct];
}
msg->msg_namelen = sizeof(struct full_sockaddr_ax25);
}
skb_free_datagram(sk, skb);
return copied;
}
static int ax25_shutdown(struct socket *sk, int how)
{
/* FIXME - generate DM and RNR states */
return -EOPNOTSUPP;
}
static int ax25_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 SIOCAX25ADDUID: /* Add a uid to the uid/call map table */
case SIOCAX25DELUID: /* Delete a uid from the uid/call map table */
case SIOCAX25GETUID: {
struct sockaddr_ax25 sax25;
if (copy_from_user(&sax25, (void *)arg, sizeof(sax25)))
return -EFAULT;
return ax25_uid_ioctl(cmd, &sax25);
}
case SIOCAX25NOUID: { /* Set the default policy (default/bar) */
long amount;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (get_user(amount, (long *)arg))
return -EFAULT;
if (amount > AX25_NOUID_BLOCK)
return -EINVAL;
ax25_uid_policy = amount;
return 0;
}
case SIOCADDRT:
case SIOCDELRT:
case SIOCAX25OPTRT:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
return ax25_rt_ioctl(cmd, (void *)arg);
case SIOCAX25CTLCON:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
return ax25_ctl_ioctl(cmd, (void *)arg);
case SIOCAX25GETINFO:
case SIOCAX25GETINFOOLD: {
struct ax25_info_struct ax25_info;
ax25_info.t1 = sk->protinfo.ax25->t1 / HZ;
ax25_info.t2 = sk->protinfo.ax25->t2 / HZ;
ax25_info.t3 = sk->protinfo.ax25->t3 / HZ;
ax25_info.idle = sk->protinfo.ax25->idle / (60 * HZ);
ax25_info.n2 = sk->protinfo.ax25->n2;
ax25_info.t1timer = ax25_display_timer(&sk->protinfo.ax25->t1timer) / HZ;
ax25_info.t2timer = ax25_display_timer(&sk->protinfo.ax25->t2timer) / HZ;
ax25_info.t3timer = ax25_display_timer(&sk->protinfo.ax25->t3timer) / HZ;
ax25_info.idletimer = ax25_display_timer(&sk->protinfo.ax25->idletimer) / (60 * HZ);
ax25_info.n2count = sk->protinfo.ax25->n2count;
ax25_info.state = sk->protinfo.ax25->state;
ax25_info.rcv_q = atomic_read(&sk->rmem_alloc);
ax25_info.snd_q = atomic_read(&sk->wmem_alloc);
ax25_info.vs = sk->protinfo.ax25->vs;
ax25_info.vr = sk->protinfo.ax25->vr;
ax25_info.va = sk->protinfo.ax25->va;
ax25_info.vs_max = sk->protinfo.ax25->vs; /* reserved */
ax25_info.paclen = sk->protinfo.ax25->paclen;
ax25_info.window = sk->protinfo.ax25->window;
/* old structure? */
if (cmd == SIOCAX25GETINFOOLD) {
static int warned = 0;
if (!warned) {
printk(KERN_INFO "%s uses old SIOCAX25GETINFO\n",
current->comm);
warned=1;
}
if (copy_to_user((void *)arg, &ax25_info, sizeof(struct ax25_info_struct_depreciated)))
return -EFAULT;
} else {
if (copy_to_user((void *)arg, &ax25_info, sizeof(struct ax25_info_struct)))
return -EINVAL;
}
return 0;
}
case SIOCAX25ADDFWD:
case SIOCAX25DELFWD: {
struct ax25_fwd_struct ax25_fwd;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(&ax25_fwd, (void *)arg, sizeof(ax25_fwd)))
return -EFAULT;
return ax25_fwd_ioctl(cmd, &ax25_fwd);
}
case SIOCGIFADDR:
case SIOCSIFADDR:
case SIOCGIFDSTADDR:
case SIOCSIFDSTADDR:
case SIOCGIFBRDADDR:
case SIOCSIFBRDADDR:
case SIOCGIFNETMASK:
case SIOCSIFNETMASK:
case SIOCGIFMETRIC:
case SIOCSIFMETRIC:
return -EINVAL;
default:
return dev_ioctl(cmd, (void *)arg);
}
/*NOTREACHED*/
return 0;
}
static int ax25_get_info(char *buffer, char **start, off_t offset, int length)
{
ax25_cb *ax25;
int k;
int len = 0;
off_t pos = 0;
off_t begin = 0;
cli();
/*
* New format:
* magic dev src_addr dest_addr,digi1,digi2,.. st vs vr va t1 t1 t2 t2 t3 t3 idle idle n2 n2 rtt window paclen Snd-Q Rcv-Q inode
*/
for (ax25 = ax25_list; ax25 != NULL; ax25 = ax25->next) {
len += sprintf(buffer+len, "%8.8lx %s %s%s ",
(long) ax25,
ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name,
ax2asc(&ax25->source_addr),
ax25->iamdigi? "*":"");
len += sprintf(buffer+len, "%s", ax2asc(&ax25->dest_addr));
for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) {
len += sprintf(buffer+len, ",%s%s",
ax2asc(&ax25->digipeat->calls[k]),
ax25->digipeat->repeated[k]? "*":"");
}
len += sprintf(buffer+len, " %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %d %d",
ax25->state,
ax25->vs, ax25->vr, ax25->va,
ax25_display_timer(&ax25->t1timer) / HZ, ax25->t1 / HZ,
ax25_display_timer(&ax25->t2timer) / HZ, ax25->t2 / HZ,
ax25_display_timer(&ax25->t3timer) / HZ, ax25->t3 / HZ,
ax25_display_timer(&ax25->idletimer) / (60 * HZ),
ax25->idle / (60 * HZ),
ax25->n2count, ax25->n2,
ax25->rtt / HZ,
ax25->window,
ax25->paclen);
if (ax25->sk != NULL) {
len += sprintf(buffer + len, " %d %d %ld\n",
atomic_read(&ax25->sk->wmem_alloc),
atomic_read(&ax25->sk->rmem_alloc),
ax25->sk->socket != NULL ? ax25->sk->socket->inode->i_ino : 0L);
} else {
len += sprintf(buffer + len, " * * *\n");
}
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 ax25_family_ops = {
family: PF_AX25,
create: ax25_create,
};
static struct proto_ops SOCKOPS_WRAPPED(ax25_proto_ops) = {
family: PF_AX25,
release: ax25_release,
bind: ax25_bind,
connect: ax25_connect,
socketpair: sock_no_socketpair,
accept: ax25_accept,
getname: ax25_getname,
poll: datagram_poll,
ioctl: ax25_ioctl,
listen: ax25_listen,
shutdown: ax25_shutdown,
setsockopt: ax25_setsockopt,
getsockopt: ax25_getsockopt,
sendmsg: ax25_sendmsg,
recvmsg: ax25_recvmsg,
mmap: sock_no_mmap,
sendpage: sock_no_sendpage,
};
#include <linux/smp_lock.h>
SOCKOPS_WRAP(ax25_proto, PF_AX25);
/*
* Called by socket.c on kernel start up
*/
static struct packet_type ax25_packet_type = {
type: __constant_htons(ETH_P_AX25),
func: ax25_kiss_rcv,
};
static struct notifier_block ax25_dev_notifier = {
notifier_call: ax25_device_event,
};
EXPORT_SYMBOL(ax25_encapsulate);
EXPORT_SYMBOL(ax25_rebuild_header);
EXPORT_SYMBOL(ax25_findbyuid);
EXPORT_SYMBOL(ax25_find_cb);
EXPORT_SYMBOL(ax25_linkfail_register);
EXPORT_SYMBOL(ax25_linkfail_release);
EXPORT_SYMBOL(ax25_listen_register);
EXPORT_SYMBOL(ax25_listen_release);
EXPORT_SYMBOL(ax25_protocol_register);
EXPORT_SYMBOL(ax25_protocol_release);
EXPORT_SYMBOL(ax25_send_frame);
EXPORT_SYMBOL(ax25_uid_policy);
EXPORT_SYMBOL(ax25cmp);
EXPORT_SYMBOL(ax2asc);
EXPORT_SYMBOL(asc2ax);
EXPORT_SYMBOL(null_ax25_address);
EXPORT_SYMBOL(ax25_display_timer);
static char banner[] __initdata = KERN_INFO "NET4: G4KLX/GW4PTS AX.25 for Linux. Version 0.37 for Linux NET4.0\n";
static int __init ax25_init(void)
{
sock_register(&ax25_family_ops);
dev_add_pack(&ax25_packet_type);
register_netdevice_notifier(&ax25_dev_notifier);
ax25_register_sysctl();
proc_net_create("ax25_route", 0, ax25_rt_get_info);
proc_net_create("ax25", 0, ax25_get_info);
proc_net_create("ax25_calls", 0, ax25_uid_get_info);
printk(banner);
return 0;
}
module_init(ax25_init);
MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
MODULE_DESCRIPTION("The amateur radio AX.25 link layer protocol");
static void __exit ax25_exit(void)
{
proc_net_remove("ax25_route");
proc_net_remove("ax25");
proc_net_remove("ax25_calls");
ax25_rt_free();
ax25_uid_free();
ax25_dev_free();
ax25_unregister_sysctl();
unregister_netdevice_notifier(&ax25_dev_notifier);
dev_remove_pack(&ax25_packet_type);
sock_unregister(PF_AX25);
}
module_exit(ax25_exit);
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