| /* |
| * This program 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. |
| * |
| * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) |
| * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) |
| * Copyright (C) Darryl Miles G7LED (dlm@g7led.demon.co.uk) |
| * Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org) |
| * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de) |
| * Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de) |
| * Copyright (C) Hans Alblas PE1AYX (hans@esrac.ele.tue.nl) |
| * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr) |
| */ |
| #include <linux/capability.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/signal.h> |
| #include <linux/timer.h> |
| #include <linux/string.h> |
| #include <linux/sockios.h> |
| #include <linux/net.h> |
| #include <linux/slab.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 <linux/uaccess.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/sysctl.h> |
| #include <linux/init.h> |
| #include <linux/spinlock.h> |
| #include <net/net_namespace.h> |
| #include <net/tcp_states.h> |
| #include <net/ip.h> |
| #include <net/arp.h> |
| |
| |
| |
| HLIST_HEAD(ax25_list); |
| DEFINE_SPINLOCK(ax25_list_lock); |
| |
| static const struct proto_ops ax25_proto_ops; |
| |
| static void ax25_free_sock(struct sock *sk) |
| { |
| ax25_cb_put(sk_to_ax25(sk)); |
| } |
| |
| /* |
| * Socket removal during an interrupt is now safe. |
| */ |
| static void ax25_cb_del(ax25_cb *ax25) |
| { |
| if (!hlist_unhashed(&ax25->ax25_node)) { |
| spin_lock_bh(&ax25_list_lock); |
| hlist_del_init(&ax25->ax25_node); |
| spin_unlock_bh(&ax25_list_lock); |
| ax25_cb_put(ax25); |
| } |
| } |
| |
| /* |
| * 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; |
| |
| spin_lock_bh(&ax25_list_lock); |
| again: |
| ax25_for_each(s, &ax25_list) { |
| if (s->ax25_dev == ax25_dev) { |
| s->ax25_dev = NULL; |
| spin_unlock_bh(&ax25_list_lock); |
| ax25_disconnect(s, ENETUNREACH); |
| spin_lock_bh(&ax25_list_lock); |
| |
| /* The entry could have been deleted from the |
| * list meanwhile and thus the next pointer is |
| * no longer valid. Play it safe and restart |
| * the scan. Forward progress is ensured |
| * because we set s->ax25_dev to NULL and we |
| * are never passed a NULL 'dev' argument. |
| */ |
| goto again; |
| } |
| } |
| spin_unlock_bh(&ax25_list_lock); |
| } |
| |
| /* |
| * Handle device status changes. |
| */ |
| static int ax25_device_event(struct notifier_block *this, unsigned long event, |
| void *ptr) |
| { |
| struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| |
| if (!net_eq(dev_net(dev), &init_net)) |
| return NOTIFY_DONE; |
| |
| /* 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_cb_add(ax25_cb *ax25) |
| { |
| spin_lock_bh(&ax25_list_lock); |
| ax25_cb_hold(ax25); |
| hlist_add_head(&ax25->ax25_node, &ax25_list); |
| spin_unlock_bh(&ax25_list_lock); |
| } |
| |
| /* |
| * 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) |
| { |
| ax25_cb *s; |
| |
| spin_lock(&ax25_list_lock); |
| ax25_for_each(s, &ax25_list) { |
| if ((s->iamdigi && !digi) || (!s->iamdigi && digi)) |
| continue; |
| if (s->sk && !ax25cmp(&s->source_addr, addr) && |
| s->sk->sk_type == type && s->sk->sk_state == TCP_LISTEN) { |
| /* If device is null we match any device */ |
| if (s->ax25_dev == NULL || s->ax25_dev->dev == dev) { |
| sock_hold(s->sk); |
| spin_unlock(&ax25_list_lock); |
| return s->sk; |
| } |
| } |
| } |
| spin_unlock(&ax25_list_lock); |
| |
| return NULL; |
| } |
| |
| /* |
| * Find an AX.25 socket given both ends. |
| */ |
| struct sock *ax25_get_socket(ax25_address *my_addr, ax25_address *dest_addr, |
| int type) |
| { |
| struct sock *sk = NULL; |
| ax25_cb *s; |
| |
| spin_lock(&ax25_list_lock); |
| ax25_for_each(s, &ax25_list) { |
| if (s->sk && !ax25cmp(&s->source_addr, my_addr) && |
| !ax25cmp(&s->dest_addr, dest_addr) && |
| s->sk->sk_type == type) { |
| sk = s->sk; |
| sock_hold(sk); |
| break; |
| } |
| } |
| |
| spin_unlock(&ax25_list_lock); |
| |
| return sk; |
| } |
| |
| /* |
| * 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; |
| |
| spin_lock_bh(&ax25_list_lock); |
| ax25_for_each(s, &ax25_list) { |
| if (s->sk && s->sk->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; |
| } |
| ax25_cb_hold(s); |
| spin_unlock_bh(&ax25_list_lock); |
| |
| return s; |
| } |
| } |
| spin_unlock_bh(&ax25_list_lock); |
| |
| return NULL; |
| } |
| |
| EXPORT_SYMBOL(ax25_find_cb); |
| |
| void ax25_send_to_raw(ax25_address *addr, struct sk_buff *skb, int proto) |
| { |
| ax25_cb *s; |
| struct sk_buff *copy; |
| |
| spin_lock(&ax25_list_lock); |
| ax25_for_each(s, &ax25_list) { |
| if (s->sk != NULL && ax25cmp(&s->source_addr, addr) == 0 && |
| s->sk->sk_type == SOCK_RAW && |
| s->sk->sk_protocol == proto && |
| s->ax25_dev->dev == skb->dev && |
| atomic_read(&s->sk->sk_rmem_alloc) <= s->sk->sk_rcvbuf) { |
| if ((copy = skb_clone(skb, GFP_ATOMIC)) == NULL) |
| continue; |
| if (sock_queue_rcv_skb(s->sk, copy) != 0) |
| kfree_skb(copy); |
| } |
| } |
| spin_unlock(&ax25_list_lock); |
| } |
| |
| /* |
| * Deferred destroy. |
| */ |
| void ax25_destroy_socket(ax25_cb *); |
| |
| /* |
| * Handler for deferred kills. |
| */ |
| static void ax25_destroy_timer(struct timer_list *t) |
| { |
| ax25_cb *ax25 = from_timer(ax25, t, dtimer); |
| struct sock *sk; |
| |
| sk=ax25->sk; |
| |
| bh_lock_sock(sk); |
| sock_hold(sk); |
| ax25_destroy_socket(ax25); |
| bh_unlock_sock(sk); |
| sock_put(sk); |
| } |
| |
| /* |
| * 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) |
| { |
| struct sk_buff *skb; |
| |
| ax25_cb_del(ax25); |
| |
| ax25_stop_heartbeat(ax25); |
| ax25_stop_t1timer(ax25); |
| ax25_stop_t2timer(ax25); |
| ax25_stop_t3timer(ax25); |
| ax25_stop_idletimer(ax25); |
| |
| ax25_clear_queues(ax25); /* Flush the queues */ |
| |
| if (ax25->sk != NULL) { |
| while ((skb = skb_dequeue(&ax25->sk->sk_receive_queue)) != NULL) { |
| if (skb->sk != ax25->sk) { |
| /* A pending connection */ |
| ax25_cb *sax25 = sk_to_ax25(skb->sk); |
| |
| /* Queue the unaccepted socket for death */ |
| sock_orphan(skb->sk); |
| |
| /* 9A4GL: hack to release unaccepted sockets */ |
| skb->sk->sk_state = TCP_LISTEN; |
| |
| ax25_start_heartbeat(sax25); |
| sax25->state = AX25_STATE_0; |
| } |
| |
| kfree_skb(skb); |
| } |
| skb_queue_purge(&ax25->sk->sk_write_queue); |
| } |
| |
| if (ax25->sk != NULL) { |
| if (sk_has_allocations(ax25->sk)) { |
| /* Defer: outstanding buffers */ |
| timer_setup(&ax25->dtimer, ax25_destroy_timer, 0); |
| ax25->dtimer.expires = jiffies + 2 * HZ; |
| add_timer(&ax25->dtimer); |
| } else { |
| struct sock *sk=ax25->sk; |
| ax25->sk=NULL; |
| sock_put(sk); |
| } |
| } else { |
| ax25_cb_put(ax25); |
| } |
| } |
| |
| /* |
| * 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 __user *arg) |
| { |
| struct ax25_ctl_struct ax25_ctl; |
| ax25_digi digi; |
| ax25_dev *ax25_dev; |
| ax25_cb *ax25; |
| unsigned int k; |
| int ret = 0; |
| |
| 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; |
| |
| if (ax25_ctl.arg > ULONG_MAX / HZ && ax25_ctl.cmd != AX25_KILL) |
| 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) |
| goto einval_put; |
| } else { |
| if (ax25_ctl.arg < 1 || ax25_ctl.arg > 63) |
| goto einval_put; |
| } |
| ax25->window = ax25_ctl.arg; |
| break; |
| |
| case AX25_T1: |
| if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ) |
| goto einval_put; |
| ax25->rtt = (ax25_ctl.arg * HZ) / 2; |
| ax25->t1 = ax25_ctl.arg * HZ; |
| break; |
| |
| case AX25_T2: |
| if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ) |
| goto einval_put; |
| ax25->t2 = ax25_ctl.arg * HZ; |
| break; |
| |
| case AX25_N2: |
| if (ax25_ctl.arg < 1 || ax25_ctl.arg > 31) |
| goto einval_put; |
| ax25->n2count = 0; |
| ax25->n2 = ax25_ctl.arg; |
| break; |
| |
| case AX25_T3: |
| if (ax25_ctl.arg > ULONG_MAX / HZ) |
| goto einval_put; |
| ax25->t3 = ax25_ctl.arg * HZ; |
| break; |
| |
| case AX25_IDLE: |
| if (ax25_ctl.arg > ULONG_MAX / (60 * HZ)) |
| goto einval_put; |
| |
| ax25->idle = ax25_ctl.arg * 60 * HZ; |
| break; |
| |
| case AX25_PACLEN: |
| if (ax25_ctl.arg < 16 || ax25_ctl.arg > 65535) |
| goto einval_put; |
| ax25->paclen = ax25_ctl.arg; |
| break; |
| |
| default: |
| goto einval_put; |
| } |
| |
| out_put: |
| ax25_cb_put(ax25); |
| return ret; |
| |
| einval_put: |
| ret = -EINVAL; |
| goto out_put; |
| } |
| |
| static void ax25_fillin_cb_from_dev(ax25_cb *ax25, ax25_dev *ax25_dev) |
| { |
| ax25->rtt = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]) / 2; |
| ax25->t1 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]); |
| ax25->t2 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T2]); |
| ax25->t3 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T3]); |
| ax25->n2 = ax25_dev->values[AX25_VALUES_N2]; |
| ax25->paclen = ax25_dev->values[AX25_VALUES_PACLEN]; |
| ax25->idle = msecs_to_jiffies(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]; |
| } |
| } |
| |
| /* |
| * 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_fillin_cb_from_dev(ax25, ax25_dev); |
| return; |
| } |
| |
| /* |
| * No device, use kernel / AX.25 spec default values |
| */ |
| ax25->rtt = msecs_to_jiffies(AX25_DEF_T1) / 2; |
| ax25->t1 = msecs_to_jiffies(AX25_DEF_T1); |
| ax25->t2 = msecs_to_jiffies(AX25_DEF_T2); |
| ax25->t3 = msecs_to_jiffies(AX25_DEF_T3); |
| ax25->n2 = AX25_DEF_N2; |
| ax25->paclen = AX25_DEF_PACLEN; |
| ax25->idle = msecs_to_jiffies(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 = kzalloc(sizeof(*ax25), GFP_ATOMIC)) == NULL) |
| return NULL; |
| |
| refcount_set(&ax25->refcount, 1); |
| |
| 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); |
| |
| ax25_setup_timers(ax25); |
| |
| 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 __user *optval, unsigned int optlen) |
| { |
| struct sock *sk = sock->sk; |
| ax25_cb *ax25; |
| struct net_device *dev; |
| char devname[IFNAMSIZ]; |
| unsigned long opt; |
| int res = 0; |
| |
| if (level != SOL_AX25) |
| return -ENOPROTOOPT; |
| |
| if (optlen < sizeof(unsigned int)) |
| return -EINVAL; |
| |
| if (get_user(opt, (unsigned int __user *)optval)) |
| return -EFAULT; |
| |
| lock_sock(sk); |
| ax25 = sk_to_ax25(sk); |
| |
| switch (optname) { |
| case AX25_WINDOW: |
| if (ax25->modulus == AX25_MODULUS) { |
| if (opt < 1 || opt > 7) { |
| res = -EINVAL; |
| break; |
| } |
| } else { |
| if (opt < 1 || opt > 63) { |
| res = -EINVAL; |
| break; |
| } |
| } |
| ax25->window = opt; |
| break; |
| |
| case AX25_T1: |
| if (opt < 1 || opt > ULONG_MAX / HZ) { |
| res = -EINVAL; |
| break; |
| } |
| ax25->rtt = (opt * HZ) >> 1; |
| ax25->t1 = opt * HZ; |
| break; |
| |
| case AX25_T2: |
| if (opt < 1 || opt > ULONG_MAX / HZ) { |
| res = -EINVAL; |
| break; |
| } |
| ax25->t2 = opt * HZ; |
| break; |
| |
| case AX25_N2: |
| if (opt < 1 || opt > 31) { |
| res = -EINVAL; |
| break; |
| } |
| ax25->n2 = opt; |
| break; |
| |
| case AX25_T3: |
| if (opt < 1 || opt > ULONG_MAX / HZ) { |
| res = -EINVAL; |
| break; |
| } |
| ax25->t3 = opt * HZ; |
| break; |
| |
| case AX25_IDLE: |
| if (opt > ULONG_MAX / (60 * HZ)) { |
| res = -EINVAL; |
| break; |
| } |
| ax25->idle = opt * 60 * HZ; |
| break; |
| |
| case AX25_BACKOFF: |
| if (opt > 2) { |
| res = -EINVAL; |
| break; |
| } |
| ax25->backoff = opt; |
| break; |
| |
| case AX25_EXTSEQ: |
| ax25->modulus = opt ? AX25_EMODULUS : AX25_MODULUS; |
| break; |
| |
| case AX25_PIDINCL: |
| ax25->pidincl = opt ? 1 : 0; |
| break; |
| |
| case AX25_IAMDIGI: |
| ax25->iamdigi = opt ? 1 : 0; |
| break; |
| |
| case AX25_PACLEN: |
| if (opt < 16 || opt > 65535) { |
| res = -EINVAL; |
| break; |
| } |
| ax25->paclen = opt; |
| break; |
| |
| case SO_BINDTODEVICE: |
| if (optlen > IFNAMSIZ) |
| optlen = IFNAMSIZ; |
| |
| if (copy_from_user(devname, optval, optlen)) { |
| res = -EFAULT; |
| break; |
| } |
| |
| if (sk->sk_type == SOCK_SEQPACKET && |
| (sock->state != SS_UNCONNECTED || |
| sk->sk_state == TCP_LISTEN)) { |
| res = -EADDRNOTAVAIL; |
| break; |
| } |
| |
| rtnl_lock(); |
| dev = __dev_get_by_name(&init_net, devname); |
| if (!dev) { |
| rtnl_unlock(); |
| res = -ENODEV; |
| break; |
| } |
| |
| ax25->ax25_dev = ax25_dev_ax25dev(dev); |
| if (!ax25->ax25_dev) { |
| rtnl_unlock(); |
| res = -ENODEV; |
| break; |
| } |
| ax25_fillin_cb(ax25, ax25->ax25_dev); |
| rtnl_unlock(); |
| break; |
| |
| default: |
| res = -ENOPROTOOPT; |
| } |
| release_sock(sk); |
| |
| return res; |
| } |
| |
| static int ax25_getsockopt(struct socket *sock, int level, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| struct sock *sk = sock->sk; |
| ax25_cb *ax25; |
| 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)); |
| |
| lock_sock(sk); |
| ax25 = sk_to_ax25(sk); |
| |
| switch (optname) { |
| case AX25_WINDOW: |
| val = ax25->window; |
| break; |
| |
| case AX25_T1: |
| val = ax25->t1 / HZ; |
| break; |
| |
| case AX25_T2: |
| val = ax25->t2 / HZ; |
| break; |
| |
| case AX25_N2: |
| val = ax25->n2; |
| break; |
| |
| case AX25_T3: |
| val = ax25->t3 / HZ; |
| break; |
| |
| case AX25_IDLE: |
| val = ax25->idle / (60 * HZ); |
| break; |
| |
| case AX25_BACKOFF: |
| val = ax25->backoff; |
| break; |
| |
| case AX25_EXTSEQ: |
| val = (ax25->modulus == AX25_EMODULUS); |
| break; |
| |
| case AX25_PIDINCL: |
| val = ax25->pidincl; |
| break; |
| |
| case AX25_IAMDIGI: |
| val = ax25->iamdigi; |
| break; |
| |
| case AX25_PACLEN: |
| val = ax25->paclen; |
| break; |
| |
| case SO_BINDTODEVICE: |
| ax25_dev = ax25->ax25_dev; |
| |
| if (ax25_dev != NULL && ax25_dev->dev != NULL) { |
| strlcpy(devname, ax25_dev->dev->name, sizeof(devname)); |
| length = strlen(devname) + 1; |
| } else { |
| *devname = '\0'; |
| length = 1; |
| } |
| |
| valptr = (void *) devname; |
| break; |
| |
| default: |
| release_sock(sk); |
| return -ENOPROTOOPT; |
| } |
| release_sock(sk); |
| |
| 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; |
| int res = 0; |
| |
| lock_sock(sk); |
| if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_LISTEN) { |
| sk->sk_max_ack_backlog = backlog; |
| sk->sk_state = TCP_LISTEN; |
| goto out; |
| } |
| res = -EOPNOTSUPP; |
| |
| out: |
| release_sock(sk); |
| |
| return res; |
| } |
| |
| /* |
| * XXX: when creating ax25_sock we should update the .obj_size setting |
| * below. |
| */ |
| static struct proto ax25_proto = { |
| .name = "AX25", |
| .owner = THIS_MODULE, |
| .obj_size = sizeof(struct ax25_sock), |
| }; |
| |
| static int ax25_create(struct net *net, struct socket *sock, int protocol, |
| int kern) |
| { |
| struct sock *sk; |
| ax25_cb *ax25; |
| |
| if (protocol < 0 || protocol > SK_PROTOCOL_MAX) |
| return -EINVAL; |
| |
| if (!net_eq(net, &init_net)) |
| return -EAFNOSUPPORT; |
| |
| 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; |
| break; |
| #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; |
| } |
| |
| sk = sk_alloc(net, PF_AX25, GFP_ATOMIC, &ax25_proto, kern); |
| if (sk == NULL) |
| return -ENOMEM; |
| |
| ax25 = ax25_sk(sk)->cb = ax25_create_cb(); |
| if (!ax25) { |
| sk_free(sk); |
| return -ENOMEM; |
| } |
| |
| sock_init_data(sock, sk); |
| |
| sk->sk_destruct = ax25_free_sock; |
| sock->ops = &ax25_proto_ops; |
| sk->sk_protocol = protocol; |
| |
| ax25->sk = sk; |
| |
| return 0; |
| } |
| |
| struct sock *ax25_make_new(struct sock *osk, struct ax25_dev *ax25_dev) |
| { |
| struct sock *sk; |
| ax25_cb *ax25, *oax25; |
| |
| sk = sk_alloc(sock_net(osk), PF_AX25, GFP_ATOMIC, osk->sk_prot, 0); |
| if (sk == NULL) |
| return NULL; |
| |
| if ((ax25 = ax25_create_cb()) == NULL) { |
| sk_free(sk); |
| return NULL; |
| } |
| |
| switch (osk->sk_type) { |
| case SOCK_DGRAM: |
| break; |
| case SOCK_SEQPACKET: |
| break; |
| default: |
| sk_free(sk); |
| ax25_cb_put(ax25); |
| return NULL; |
| } |
| |
| sock_init_data(NULL, sk); |
| |
| sk->sk_type = osk->sk_type; |
| sk->sk_priority = osk->sk_priority; |
| sk->sk_protocol = osk->sk_protocol; |
| sk->sk_rcvbuf = osk->sk_rcvbuf; |
| sk->sk_sndbuf = osk->sk_sndbuf; |
| sk->sk_state = TCP_ESTABLISHED; |
| sock_copy_flags(sk, osk); |
| |
| oax25 = sk_to_ax25(osk); |
| |
| ax25->modulus = oax25->modulus; |
| ax25->backoff = oax25->backoff; |
| ax25->pidincl = oax25->pidincl; |
| ax25->iamdigi = oax25->iamdigi; |
| ax25->rtt = oax25->rtt; |
| ax25->t1 = oax25->t1; |
| ax25->t2 = oax25->t2; |
| ax25->t3 = oax25->t3; |
| ax25->n2 = oax25->n2; |
| ax25->idle = oax25->idle; |
| ax25->paclen = oax25->paclen; |
| ax25->window = oax25->window; |
| |
| ax25->ax25_dev = ax25_dev; |
| ax25->source_addr = oax25->source_addr; |
| |
| if (oax25->digipeat != NULL) { |
| ax25->digipeat = kmemdup(oax25->digipeat, sizeof(ax25_digi), |
| GFP_ATOMIC); |
| if (ax25->digipeat == NULL) { |
| sk_free(sk); |
| ax25_cb_put(ax25); |
| return NULL; |
| } |
| } |
| |
| ax25_sk(sk)->cb = ax25; |
| sk->sk_destruct = ax25_free_sock; |
| ax25->sk = sk; |
| |
| return sk; |
| } |
| |
| static int ax25_release(struct socket *sock) |
| { |
| struct sock *sk = sock->sk; |
| ax25_cb *ax25; |
| |
| if (sk == NULL) |
| return 0; |
| |
| sock_hold(sk); |
| sock_orphan(sk); |
| lock_sock(sk); |
| ax25 = sk_to_ax25(sk); |
| |
| if (sk->sk_type == SOCK_SEQPACKET) { |
| switch (ax25->state) { |
| case AX25_STATE_0: |
| release_sock(sk); |
| ax25_disconnect(ax25, 0); |
| lock_sock(sk); |
| ax25_destroy_socket(ax25); |
| break; |
| |
| case AX25_STATE_1: |
| case AX25_STATE_2: |
| ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); |
| release_sock(sk); |
| ax25_disconnect(ax25, 0); |
| lock_sock(sk); |
| if (!sock_flag(ax25->sk, SOCK_DESTROY)) |
| ax25_destroy_socket(ax25); |
| break; |
| |
| case AX25_STATE_3: |
| case AX25_STATE_4: |
| ax25_clear_queues(ax25); |
| ax25->n2count = 0; |
| |
| switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) { |
| case AX25_PROTO_STD_SIMPLEX: |
| case AX25_PROTO_STD_DUPLEX: |
| ax25_send_control(ax25, |
| AX25_DISC, |
| AX25_POLLON, |
| AX25_COMMAND); |
| ax25_stop_t2timer(ax25); |
| ax25_stop_t3timer(ax25); |
| ax25_stop_idletimer(ax25); |
| break; |
| #ifdef CONFIG_AX25_DAMA_SLAVE |
| case AX25_PROTO_DAMA_SLAVE: |
| ax25_stop_t3timer(ax25); |
| ax25_stop_idletimer(ax25); |
| break; |
| #endif |
| } |
| ax25_calculate_t1(ax25); |
| ax25_start_t1timer(ax25); |
| ax25->state = AX25_STATE_2; |
| sk->sk_state = TCP_CLOSE; |
| sk->sk_shutdown |= SEND_SHUTDOWN; |
| sk->sk_state_change(sk); |
| sock_set_flag(sk, SOCK_DESTROY); |
| break; |
| |
| default: |
| break; |
| } |
| } else { |
| sk->sk_state = TCP_CLOSE; |
| sk->sk_shutdown |= SEND_SHUTDOWN; |
| sk->sk_state_change(sk); |
| ax25_destroy_socket(ax25); |
| } |
| |
| sock->sk = NULL; |
| release_sock(sk); |
| sock_put(sk); |
| |
| 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_dev *ax25_dev = NULL; |
| ax25_uid_assoc *user; |
| ax25_address call; |
| ax25_cb *ax25; |
| int err = 0; |
| |
| if (addr_len != sizeof(struct sockaddr_ax25) && |
| addr_len != sizeof(struct full_sockaddr_ax25)) |
| /* support for old structure may go away some time |
| * ax25_bind(): uses old (6 digipeater) socket structure. |
| */ |
| if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) || |
| (addr_len > sizeof(struct full_sockaddr_ax25))) |
| return -EINVAL; |
| |
| if (addr->fsa_ax25.sax25_family != AF_AX25) |
| return -EINVAL; |
| |
| user = ax25_findbyuid(current_euid()); |
| if (user) { |
| call = user->call; |
| ax25_uid_put(user); |
| } else { |
| if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) |
| return -EACCES; |
| |
| call = addr->fsa_ax25.sax25_call; |
| } |
| |
| lock_sock(sk); |
| |
| ax25 = sk_to_ax25(sk); |
| if (!sock_flag(sk, SOCK_ZAPPED)) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| ax25->source_addr = call; |
| |
| /* |
| * User already set interface with SO_BINDTODEVICE |
| */ |
| if (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) { |
| err = -EADDRNOTAVAIL; |
| goto out; |
| } |
| } else { |
| if ((ax25_dev = ax25_addr_ax25dev(&addr->fsa_ax25.sax25_call)) == NULL) { |
| err = -EADDRNOTAVAIL; |
| goto out; |
| } |
| } |
| |
| if (ax25_dev != NULL) |
| ax25_fillin_cb(ax25, ax25_dev); |
| |
| done: |
| ax25_cb_add(ax25); |
| sock_reset_flag(sk, SOCK_ZAPPED); |
| |
| out: |
| release_sock(sk); |
| |
| return err; |
| } |
| |
| /* |
| * FIXME: nonblock behaviour looks like it may have a bug. |
| */ |
| static int __must_check ax25_connect(struct socket *sock, |
| struct sockaddr *uaddr, int addr_len, int flags) |
| { |
| struct sock *sk = sock->sk; |
| ax25_cb *ax25 = sk_to_ax25(sk), *ax25t; |
| struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr; |
| ax25_digi *digi = NULL; |
| int ct = 0, err = 0; |
| |
| /* |
| * 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 |
| * ax25_connect(): uses obsolete socket structure |
| */ |
| ; |
| else if (addr_len != sizeof(struct full_sockaddr_ax25)) |
| /* support for old structure may go away some time |
| * ax25_connect(): uses old (6 digipeater) socket structure. |
| */ |
| if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) || |
| (addr_len > sizeof(struct full_sockaddr_ax25))) |
| return -EINVAL; |
| |
| |
| if (fsa->fsa_ax25.sax25_family != AF_AX25) |
| return -EINVAL; |
| |
| lock_sock(sk); |
| |
| /* deal with restarts */ |
| if (sock->state == SS_CONNECTING) { |
| switch (sk->sk_state) { |
| case TCP_SYN_SENT: /* still trying */ |
| err = -EINPROGRESS; |
| goto out_release; |
| |
| case TCP_ESTABLISHED: /* connection established */ |
| sock->state = SS_CONNECTED; |
| goto out_release; |
| |
| case TCP_CLOSE: /* connection refused */ |
| sock->state = SS_UNCONNECTED; |
| err = -ECONNREFUSED; |
| goto out_release; |
| } |
| } |
| |
| if (sk->sk_state == TCP_ESTABLISHED && sk->sk_type == SOCK_SEQPACKET) { |
| err = -EISCONN; /* No reconnect on a seqpacket socket */ |
| goto out_release; |
| } |
| |
| sk->sk_state = TCP_CLOSE; |
| sock->state = SS_UNCONNECTED; |
| |
| kfree(ax25->digipeat); |
| 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) { |
| err = -EINVAL; |
| goto out_release; |
| } |
| |
| if ((digi = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) { |
| err = -ENOBUFS; |
| goto out_release; |
| } |
| |
| 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) && 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 (sock_flag(sk, SOCK_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(ax25, &fsa->fsa_ax25.sax25_call)) < 0) { |
| kfree(digi); |
| goto out_release; |
| } |
| |
| ax25_fillin_cb(ax25, ax25->ax25_dev); |
| ax25_cb_add(ax25); |
| } else { |
| if (ax25->ax25_dev == NULL) { |
| kfree(digi); |
| err = -EHOSTUNREACH; |
| goto out_release; |
| } |
| } |
| |
| if (sk->sk_type == SOCK_SEQPACKET && |
| (ax25t=ax25_find_cb(&ax25->source_addr, &fsa->fsa_ax25.sax25_call, digi, |
| ax25->ax25_dev->dev))) { |
| kfree(digi); |
| err = -EADDRINUSE; /* Already such a connection */ |
| ax25_cb_put(ax25t); |
| goto out_release; |
| } |
| |
| ax25->dest_addr = fsa->fsa_ax25.sax25_call; |
| ax25->digipeat = digi; |
| |
| /* First the easy one */ |
| if (sk->sk_type != SOCK_SEQPACKET) { |
| sock->state = SS_CONNECTED; |
| sk->sk_state = TCP_ESTABLISHED; |
| goto out_release; |
| } |
| |
| /* Move to connecting socket, ax.25 lapb WAIT_UA.. */ |
| sock->state = SS_CONNECTING; |
| sk->sk_state = TCP_SYN_SENT; |
| |
| switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) { |
| case AX25_PROTO_STD_SIMPLEX: |
| case AX25_PROTO_STD_DUPLEX: |
| ax25_std_establish_data_link(ax25); |
| break; |
| |
| #ifdef CONFIG_AX25_DAMA_SLAVE |
| case AX25_PROTO_DAMA_SLAVE: |
| ax25->modulus = AX25_MODULUS; |
| ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW]; |
| if (ax25->ax25_dev->dama.slave) |
| ax25_ds_establish_data_link(ax25); |
| else |
| ax25_std_establish_data_link(ax25); |
| break; |
| #endif |
| } |
| |
| ax25->state = AX25_STATE_1; |
| |
| ax25_start_heartbeat(ax25); |
| |
| /* Now the loop */ |
| if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { |
| err = -EINPROGRESS; |
| goto out_release; |
| } |
| |
| if (sk->sk_state == TCP_SYN_SENT) { |
| DEFINE_WAIT(wait); |
| |
| for (;;) { |
| prepare_to_wait(sk_sleep(sk), &wait, |
| TASK_INTERRUPTIBLE); |
| if (sk->sk_state != TCP_SYN_SENT) |
| break; |
| if (!signal_pending(current)) { |
| release_sock(sk); |
| schedule(); |
| lock_sock(sk); |
| continue; |
| } |
| err = -ERESTARTSYS; |
| break; |
| } |
| finish_wait(sk_sleep(sk), &wait); |
| |
| if (err) |
| goto out_release; |
| } |
| |
| if (sk->sk_state != TCP_ESTABLISHED) { |
| /* Not in ABM, not in WAIT_UA -> failed */ |
| sock->state = SS_UNCONNECTED; |
| err = sock_error(sk); /* Always set at this point */ |
| goto out_release; |
| } |
| |
| sock->state = SS_CONNECTED; |
| |
| err = 0; |
| out_release: |
| release_sock(sk); |
| |
| return err; |
| } |
| |
| static int ax25_accept(struct socket *sock, struct socket *newsock, int flags, |
| bool kern) |
| { |
| struct sk_buff *skb; |
| struct sock *newsk; |
| DEFINE_WAIT(wait); |
| struct sock *sk; |
| int err = 0; |
| |
| if (sock->state != SS_UNCONNECTED) |
| return -EINVAL; |
| |
| if ((sk = sock->sk) == NULL) |
| return -EINVAL; |
| |
| lock_sock(sk); |
| if (sk->sk_type != SOCK_SEQPACKET) { |
| err = -EOPNOTSUPP; |
| goto out; |
| } |
| |
| if (sk->sk_state != TCP_LISTEN) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| /* |
| * The read queue this time is holding sockets ready to use |
| * hooked into the SABM we saved |
| */ |
| for (;;) { |
| prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
| skb = skb_dequeue(&sk->sk_receive_queue); |
| if (skb) |
| break; |
| |
| if (flags & O_NONBLOCK) { |
| err = -EWOULDBLOCK; |
| break; |
| } |
| if (!signal_pending(current)) { |
| release_sock(sk); |
| schedule(); |
| lock_sock(sk); |
| continue; |
| } |
| err = -ERESTARTSYS; |
| break; |
| } |
| finish_wait(sk_sleep(sk), &wait); |
| |
| if (err) |
| goto out; |
| |
| newsk = skb->sk; |
| sock_graft(newsk, newsock); |
| |
| /* Now attach up the new socket */ |
| kfree_skb(skb); |
| sk->sk_ack_backlog--; |
| newsock->state = SS_CONNECTED; |
| |
| out: |
| release_sock(sk); |
| |
| return err; |
| } |
| |
| static int ax25_getname(struct socket *sock, struct sockaddr *uaddr, |
| int peer) |
| { |
| struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr; |
| struct sock *sk = sock->sk; |
| unsigned char ndigi, i; |
| ax25_cb *ax25; |
| int err = 0; |
| |
| memset(fsa, 0, sizeof(*fsa)); |
| lock_sock(sk); |
| ax25 = sk_to_ax25(sk); |
| |
| if (peer != 0) { |
| if (sk->sk_state != TCP_ESTABLISHED) { |
| err = -ENOTCONN; |
| goto out; |
| } |
| |
| fsa->fsa_ax25.sax25_family = AF_AX25; |
| fsa->fsa_ax25.sax25_call = ax25->dest_addr; |
| |
| if (ax25->digipeat != NULL) { |
| ndigi = ax25->digipeat->ndigi; |
| fsa->fsa_ax25.sax25_ndigis = ndigi; |
| for (i = 0; i < ndigi; i++) |
| fsa->fsa_digipeater[i] = |
| ax25->digipeat->calls[i]; |
| } |
| } else { |
| fsa->fsa_ax25.sax25_family = AF_AX25; |
| fsa->fsa_ax25.sax25_call = ax25->source_addr; |
| fsa->fsa_ax25.sax25_ndigis = 1; |
| if (ax25->ax25_dev != NULL) { |
| memcpy(&fsa->fsa_digipeater[0], |
| ax25->ax25_dev->dev->dev_addr, AX25_ADDR_LEN); |
| } else { |
| fsa->fsa_digipeater[0] = null_ax25_address; |
| } |
| } |
| err = sizeof (struct full_sockaddr_ax25); |
| |
| out: |
| release_sock(sk); |
| |
| return err; |
| } |
| |
| static int ax25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
| { |
| DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name); |
| struct sock *sk = sock->sk; |
| struct sockaddr_ax25 sax; |
| struct sk_buff *skb; |
| ax25_digi dtmp, *dp; |
| ax25_cb *ax25; |
| size_t size; |
| int lv, err, addr_len = msg->msg_namelen; |
| |
| if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) |
| return -EINVAL; |
| |
| lock_sock(sk); |
| ax25 = sk_to_ax25(sk); |
| |
| if (sock_flag(sk, SOCK_ZAPPED)) { |
| err = -EADDRNOTAVAIL; |
| goto out; |
| } |
| |
| if (sk->sk_shutdown & SEND_SHUTDOWN) { |
| send_sig(SIGPIPE, current, 0); |
| err = -EPIPE; |
| goto out; |
| } |
| |
| if (ax25->ax25_dev == NULL) { |
| err = -ENETUNREACH; |
| goto out; |
| } |
| |
| if (len > ax25->ax25_dev->dev->mtu) { |
| err = -EMSGSIZE; |
| goto out; |
| } |
| |
| if (usax != NULL) { |
| if (usax->sax25_family != AF_AX25) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| if (addr_len == sizeof(struct sockaddr_ax25)) |
| /* ax25_sendmsg(): uses obsolete socket structure */ |
| ; |
| else if (addr_len != sizeof(struct full_sockaddr_ax25)) |
| /* support for old structure may go away some time |
| * ax25_sendmsg(): uses old (6 digipeater) |
| * socket structure. |
| */ |
| if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) || |
| (addr_len > sizeof(struct full_sockaddr_ax25))) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| |
| 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) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| 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->sk_type == SOCK_SEQPACKET && |
| ax25cmp(&ax25->dest_addr, &sax.sax25_call)) { |
| err = -EISCONN; |
| goto out; |
| } |
| 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->sk_state != TCP_ESTABLISHED) { |
| err = -ENOTCONN; |
| goto out; |
| } |
| sax.sax25_family = AF_AX25; |
| sax.sax25_call = ax25->dest_addr; |
| dp = ax25->digipeat; |
| } |
| |
| /* Build a packet */ |
| /* Assume the worst case */ |
| size = len + ax25->ax25_dev->dev->hard_header_len; |
| |
| skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, &err); |
| if (skb == NULL) |
| goto out; |
| |
| skb_reserve(skb, size - len); |
| |
| /* User data follows immediately after the AX.25 data */ |
| if (memcpy_from_msg(skb_put(skb, len), msg, len)) { |
| err = -EFAULT; |
| kfree_skb(skb); |
| goto out; |
| } |
| |
| skb_reset_network_header(skb); |
| |
| /* Add the PID if one is not supplied by the user in the skb */ |
| if (!ax25->pidincl) |
| *(u8 *)skb_push(skb, 1) = sk->sk_protocol; |
| |
| if (sk->sk_type == SOCK_SEQPACKET) { |
| /* Connected mode sockets go via the LAPB machine */ |
| if (sk->sk_state != TCP_ESTABLISHED) { |
| kfree_skb(skb); |
| err = -ENOTCONN; |
| goto out; |
| } |
| |
| /* Shove it onto the queue and kick */ |
| ax25_output(ax25, ax25->paclen, skb); |
| |
| err = len; |
| goto out; |
| } |
| |
| skb_push(skb, 1 + ax25_addr_size(dp)); |
| |
| /* Building AX.25 Header */ |
| |
| /* Build an AX.25 header */ |
| lv = ax25_addr_build(skb->data, &ax25->source_addr, &sax.sax25_call, |
| dp, AX25_COMMAND, AX25_MODULUS); |
| |
| skb_set_transport_header(skb, lv); |
| |
| *skb_transport_header(skb) = AX25_UI; |
| |
| /* Datagram frames go straight out of the door as UI */ |
| ax25_queue_xmit(skb, ax25->ax25_dev->dev); |
| |
| err = len; |
| |
| out: |
| release_sock(sk); |
| |
| return err; |
| } |
| |
| static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
| int flags) |
| { |
| struct sock *sk = sock->sk; |
| struct sk_buff *skb; |
| int copied; |
| int err = 0; |
| |
| lock_sock(sk); |
| /* |
| * This works for seqpacket too. The receiver has ordered the |
| * queue for us! We do one quick check first though |
| */ |
| if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_ESTABLISHED) { |
| err = -ENOTCONN; |
| goto out; |
| } |
| |
| /* Now we can treat all alike */ |
| skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, |
| flags & MSG_DONTWAIT, &err); |
| if (skb == NULL) |
| goto out; |
| |
| if (!sk_to_ax25(sk)->pidincl) |
| skb_pull(skb, 1); /* Remove PID */ |
| |
| skb_reset_transport_header(skb); |
| copied = skb->len; |
| |
| if (copied > size) { |
| copied = size; |
| msg->msg_flags |= MSG_TRUNC; |
| } |
| |
| skb_copy_datagram_msg(skb, 0, msg, copied); |
| |
| if (msg->msg_name) { |
| ax25_digi digi; |
| ax25_address src; |
| const unsigned char *mac = skb_mac_header(skb); |
| DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name); |
| |
| memset(sax, 0, sizeof(struct full_sockaddr_ax25)); |
| ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL, |
| &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 = src; |
| |
| 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); |
| err = copied; |
| |
| out: |
| release_sock(sk); |
| |
| return err; |
| } |
| |
| 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; |
| void __user *argp = (void __user *)arg; |
| int res = 0; |
| |
| lock_sock(sk); |
| switch (cmd) { |
| case TIOCOUTQ: { |
| long amount; |
| |
| amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); |
| if (amount < 0) |
| amount = 0; |
| res = put_user(amount, (int __user *)argp); |
| break; |
| } |
| |
| 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->sk_receive_queue)) != NULL) |
| amount = skb->len; |
| res = put_user(amount, (int __user *) argp); |
| break; |
| } |
| |
| case SIOCGSTAMP: |
| res = sock_get_timestamp(sk, argp); |
| break; |
| |
| case SIOCGSTAMPNS: |
| res = sock_get_timestampns(sk, argp); |
| break; |
| |
| 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, argp, sizeof(sax25))) { |
| res = -EFAULT; |
| break; |
| } |
| res = ax25_uid_ioctl(cmd, &sax25); |
| break; |
| } |
| |
| case SIOCAX25NOUID: { /* Set the default policy (default/bar) */ |
| long amount; |
| if (!capable(CAP_NET_ADMIN)) { |
| res = -EPERM; |
| break; |
| } |
| if (get_user(amount, (long __user *)argp)) { |
| res = -EFAULT; |
| break; |
| } |
| if (amount < 0 || amount > AX25_NOUID_BLOCK) { |
| res = -EINVAL; |
| break; |
| } |
| ax25_uid_policy = amount; |
| res = 0; |
| break; |
| } |
| |
| case SIOCADDRT: |
| case SIOCDELRT: |
| case SIOCAX25OPTRT: |
| if (!capable(CAP_NET_ADMIN)) { |
| res = -EPERM; |
| break; |
| } |
| res = ax25_rt_ioctl(cmd, argp); |
| break; |
| |
| case SIOCAX25CTLCON: |
| if (!capable(CAP_NET_ADMIN)) { |
| res = -EPERM; |
| break; |
| } |
| res = ax25_ctl_ioctl(cmd, argp); |
| break; |
| |
| case SIOCAX25GETINFO: |
| case SIOCAX25GETINFOOLD: { |
| ax25_cb *ax25 = sk_to_ax25(sk); |
| struct ax25_info_struct ax25_info; |
| |
| ax25_info.t1 = ax25->t1 / HZ; |
| ax25_info.t2 = ax25->t2 / HZ; |
| ax25_info.t3 = ax25->t3 / HZ; |
| ax25_info.idle = ax25->idle / (60 * HZ); |
| ax25_info.n2 = ax25->n2; |
| ax25_info.t1timer = ax25_display_timer(&ax25->t1timer) / HZ; |
| ax25_info.t2timer = ax25_display_timer(&ax25->t2timer) / HZ; |
| ax25_info.t3timer = ax25_display_timer(&ax25->t3timer) / HZ; |
| ax25_info.idletimer = ax25_display_timer(&ax25->idletimer) / (60 * HZ); |
| ax25_info.n2count = ax25->n2count; |
| ax25_info.state = ax25->state; |
| ax25_info.rcv_q = sk_rmem_alloc_get(sk); |
| ax25_info.snd_q = sk_wmem_alloc_get(sk); |
| ax25_info.vs = ax25->vs; |
| ax25_info.vr = ax25->vr; |
| ax25_info.va = ax25->va; |
| ax25_info.vs_max = ax25->vs; /* reserved */ |
| ax25_info.paclen = ax25->paclen; |
| ax25_info.window = 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(argp, &ax25_info, sizeof(struct ax25_info_struct_deprecated))) { |
| res = -EFAULT; |
| break; |
| } |
| } else { |
| if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct))) { |
| res = -EINVAL; |
| break; |
| } |
| } |
| res = 0; |
| break; |
| } |
| |
| case SIOCAX25ADDFWD: |
| case SIOCAX25DELFWD: { |
| struct ax25_fwd_struct ax25_fwd; |
| if (!capable(CAP_NET_ADMIN)) { |
| res = -EPERM; |
| break; |
| } |
| if (copy_from_user(&ax25_fwd, argp, sizeof(ax25_fwd))) { |
| res = -EFAULT; |
| break; |
| } |
| res = ax25_fwd_ioctl(cmd, &ax25_fwd); |
| break; |
| } |
| |
| case SIOCGIFADDR: |
| case SIOCSIFADDR: |
| case SIOCGIFDSTADDR: |
| case SIOCSIFDSTADDR: |
| case SIOCGIFBRDADDR: |
| case SIOCSIFBRDADDR: |
| case SIOCGIFNETMASK: |
| case SIOCSIFNETMASK: |
| case SIOCGIFMETRIC: |
| case SIOCSIFMETRIC: |
| res = -EINVAL; |
| break; |
| |
| default: |
| res = -ENOIOCTLCMD; |
| break; |
| } |
| release_sock(sk); |
| |
| return res; |
| } |
| |
| #ifdef CONFIG_PROC_FS |
| |
| static void *ax25_info_start(struct seq_file *seq, loff_t *pos) |
| __acquires(ax25_list_lock) |
| { |
| spin_lock_bh(&ax25_list_lock); |
| return seq_hlist_start(&ax25_list, *pos); |
| } |
| |
| static void *ax25_info_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| return seq_hlist_next(v, &ax25_list, pos); |
| } |
| |
| static void ax25_info_stop(struct seq_file *seq, void *v) |
| __releases(ax25_list_lock) |
| { |
| spin_unlock_bh(&ax25_list_lock); |
| } |
| |
| static int ax25_info_show(struct seq_file *seq, void *v) |
| { |
| ax25_cb *ax25 = hlist_entry(v, struct ax25_cb, ax25_node); |
| char buf[11]; |
| int k; |
| |
| |
| /* |
| * 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 |
| */ |
| |
| seq_printf(seq, "%8.8lx %s %s%s ", |
| (long) ax25, |
| ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name, |
| ax2asc(buf, &ax25->source_addr), |
| ax25->iamdigi? "*":""); |
| seq_printf(seq, "%s", ax2asc(buf, &ax25->dest_addr)); |
| |
| for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) { |
| seq_printf(seq, ",%s%s", |
| ax2asc(buf, &ax25->digipeat->calls[k]), |
| ax25->digipeat->repeated[k]? "*":""); |
| } |
| |
| seq_printf(seq, " %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) { |
| seq_printf(seq, " %d %d %lu\n", |
| sk_wmem_alloc_get(ax25->sk), |
| sk_rmem_alloc_get(ax25->sk), |
| sock_i_ino(ax25->sk)); |
| } else { |
| seq_puts(seq, " * * *\n"); |
| } |
| return 0; |
| } |
| |
| static const struct seq_operations ax25_info_seqops = { |
| .start = ax25_info_start, |
| .next = ax25_info_next, |
| .stop = ax25_info_stop, |
| .show = ax25_info_show, |
| }; |
| #endif |
| |
| static const struct net_proto_family ax25_family_ops = { |
| .family = PF_AX25, |
| .create = ax25_create, |
| .owner = THIS_MODULE, |
| }; |
| |
| static const struct proto_ops ax25_proto_ops = { |
| .family = PF_AX25, |
| .owner = THIS_MODULE, |
| .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, |
| }; |
| |
| /* |
| * Called by socket.c on kernel start up |
| */ |
| static struct packet_type ax25_packet_type __read_mostly = { |
| .type = cpu_to_be16(ETH_P_AX25), |
| .func = ax25_kiss_rcv, |
| }; |
| |
| static struct notifier_block ax25_dev_notifier = { |
| .notifier_call = ax25_device_event, |
| }; |
| |
| static int __init ax25_init(void) |
| { |
| int rc = proto_register(&ax25_proto, 0); |
| |
| if (rc != 0) |
| goto out; |
| |
| sock_register(&ax25_family_ops); |
| dev_add_pack(&ax25_packet_type); |
| register_netdevice_notifier(&ax25_dev_notifier); |
| |
| proc_create_seq("ax25_route", 0444, init_net.proc_net, &ax25_rt_seqops); |
| proc_create_seq("ax25", 0444, init_net.proc_net, &ax25_info_seqops); |
| proc_create_seq("ax25_calls", 0444, init_net.proc_net, |
| &ax25_uid_seqops); |
| out: |
| return rc; |
| } |
| module_init(ax25_init); |
| |
| |
| MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); |
| MODULE_DESCRIPTION("The amateur radio AX.25 link layer protocol"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_NETPROTO(PF_AX25); |
| |
| static void __exit ax25_exit(void) |
| { |
| remove_proc_entry("ax25_route", init_net.proc_net); |
| remove_proc_entry("ax25", init_net.proc_net); |
| remove_proc_entry("ax25_calls", init_net.proc_net); |
| |
| unregister_netdevice_notifier(&ax25_dev_notifier); |
| |
| dev_remove_pack(&ax25_packet_type); |
| |
| sock_unregister(PF_AX25); |
| proto_unregister(&ax25_proto); |
| |
| ax25_rt_free(); |
| ax25_uid_free(); |
| ax25_dev_free(); |
| } |
| module_exit(ax25_exit); |