af_ax25.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:48k
- /*
- * 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] = ' ';
- } else {
- *devname = ' ';
- 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 structuren",
- 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.den",
- 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 structuren",
- 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 datan");
- /* 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 buffern");
- 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=%dn", 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=%pn", 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 SIOCAX25GETINFOn",
- 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 %ldn",
- 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 NET4.0n";
- 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);