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2019 lines
44 KiB
2019 lines
44 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* |
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* Copyright (C) Alan Cox GW4PTS ([email protected]) |
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* Copyright (C) Jonathan Naylor G4KLX ([email protected]) |
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* Copyright (C) Darryl Miles G7LED ([email protected]) |
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* Copyright (C) Steven Whitehouse GW7RRM ([email protected]) |
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* Copyright (C) Joerg Reuter DL1BKE ([email protected]) |
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* Copyright (C) Hans-Joachim Hetscher DD8NE ([email protected]) |
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* Copyright (C) Hans Alblas PE1AYX ([email protected]) |
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* Copyright (C) Frederic Rible F1OAT ([email protected]) |
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*/ |
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#include <linux/capability.h> |
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#include <linux/module.h> |
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#include <linux/errno.h> |
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#include <linux/types.h> |
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#include <linux/socket.h> |
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#include <linux/in.h> |
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#include <linux/kernel.h> |
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#include <linux/sched/signal.h> |
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#include <linux/timer.h> |
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#include <linux/string.h> |
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#include <linux/sockios.h> |
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#include <linux/net.h> |
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#include <linux/slab.h> |
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#include <net/ax25.h> |
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#include <linux/inet.h> |
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#include <linux/netdevice.h> |
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#include <linux/if_arp.h> |
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#include <linux/skbuff.h> |
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#include <net/sock.h> |
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#include <linux/uaccess.h> |
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#include <linux/fcntl.h> |
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#include <linux/termios.h> /* For TIOCINQ/OUTQ */ |
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#include <linux/mm.h> |
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#include <linux/interrupt.h> |
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#include <linux/notifier.h> |
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#include <linux/proc_fs.h> |
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#include <linux/stat.h> |
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#include <linux/sysctl.h> |
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#include <linux/init.h> |
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#include <linux/spinlock.h> |
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#include <net/net_namespace.h> |
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#include <net/tcp_states.h> |
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#include <net/ip.h> |
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#include <net/arp.h> |
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HLIST_HEAD(ax25_list); |
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DEFINE_SPINLOCK(ax25_list_lock); |
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static const struct proto_ops ax25_proto_ops; |
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static void ax25_free_sock(struct sock *sk) |
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{ |
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ax25_cb_put(sk_to_ax25(sk)); |
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} |
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/* |
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* Socket removal during an interrupt is now safe. |
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*/ |
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static void ax25_cb_del(ax25_cb *ax25) |
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{ |
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if (!hlist_unhashed(&ax25->ax25_node)) { |
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spin_lock_bh(&ax25_list_lock); |
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hlist_del_init(&ax25->ax25_node); |
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spin_unlock_bh(&ax25_list_lock); |
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ax25_cb_put(ax25); |
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} |
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} |
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/* |
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* Kill all bound sockets on a dropped device. |
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*/ |
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static void ax25_kill_by_device(struct net_device *dev) |
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{ |
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ax25_dev *ax25_dev; |
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ax25_cb *s; |
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if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) |
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return; |
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spin_lock_bh(&ax25_list_lock); |
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again: |
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ax25_for_each(s, &ax25_list) { |
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if (s->ax25_dev == ax25_dev) { |
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s->ax25_dev = NULL; |
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spin_unlock_bh(&ax25_list_lock); |
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ax25_disconnect(s, ENETUNREACH); |
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spin_lock_bh(&ax25_list_lock); |
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/* The entry could have been deleted from the |
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* list meanwhile and thus the next pointer is |
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* no longer valid. Play it safe and restart |
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* the scan. Forward progress is ensured |
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* because we set s->ax25_dev to NULL and we |
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* are never passed a NULL 'dev' argument. |
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*/ |
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goto again; |
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} |
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} |
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spin_unlock_bh(&ax25_list_lock); |
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} |
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/* |
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* Handle device status changes. |
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*/ |
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static int ax25_device_event(struct notifier_block *this, unsigned long event, |
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void *ptr) |
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{ |
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struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
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if (!net_eq(dev_net(dev), &init_net)) |
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return NOTIFY_DONE; |
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/* Reject non AX.25 devices */ |
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if (dev->type != ARPHRD_AX25) |
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return NOTIFY_DONE; |
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switch (event) { |
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case NETDEV_UP: |
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ax25_dev_device_up(dev); |
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break; |
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case NETDEV_DOWN: |
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ax25_kill_by_device(dev); |
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ax25_rt_device_down(dev); |
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ax25_dev_device_down(dev); |
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break; |
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default: |
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break; |
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} |
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return NOTIFY_DONE; |
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} |
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/* |
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* Add a socket to the bound sockets list. |
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*/ |
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void ax25_cb_add(ax25_cb *ax25) |
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{ |
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spin_lock_bh(&ax25_list_lock); |
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ax25_cb_hold(ax25); |
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hlist_add_head(&ax25->ax25_node, &ax25_list); |
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spin_unlock_bh(&ax25_list_lock); |
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} |
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/* |
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* Find a socket that wants to accept the SABM we have just |
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* received. |
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*/ |
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struct sock *ax25_find_listener(ax25_address *addr, int digi, |
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struct net_device *dev, int type) |
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{ |
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ax25_cb *s; |
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spin_lock(&ax25_list_lock); |
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ax25_for_each(s, &ax25_list) { |
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if ((s->iamdigi && !digi) || (!s->iamdigi && digi)) |
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continue; |
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if (s->sk && !ax25cmp(&s->source_addr, addr) && |
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s->sk->sk_type == type && s->sk->sk_state == TCP_LISTEN) { |
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/* If device is null we match any device */ |
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if (s->ax25_dev == NULL || s->ax25_dev->dev == dev) { |
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sock_hold(s->sk); |
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spin_unlock(&ax25_list_lock); |
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return s->sk; |
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} |
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} |
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} |
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spin_unlock(&ax25_list_lock); |
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return NULL; |
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} |
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/* |
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* Find an AX.25 socket given both ends. |
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*/ |
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struct sock *ax25_get_socket(ax25_address *my_addr, ax25_address *dest_addr, |
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int type) |
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{ |
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struct sock *sk = NULL; |
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ax25_cb *s; |
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spin_lock(&ax25_list_lock); |
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ax25_for_each(s, &ax25_list) { |
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if (s->sk && !ax25cmp(&s->source_addr, my_addr) && |
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!ax25cmp(&s->dest_addr, dest_addr) && |
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s->sk->sk_type == type) { |
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sk = s->sk; |
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sock_hold(sk); |
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break; |
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} |
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} |
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spin_unlock(&ax25_list_lock); |
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return sk; |
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} |
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/* |
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* Find an AX.25 control block given both ends. It will only pick up |
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* floating AX.25 control blocks or non Raw socket bound control blocks. |
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*/ |
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ax25_cb *ax25_find_cb(ax25_address *src_addr, ax25_address *dest_addr, |
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ax25_digi *digi, struct net_device *dev) |
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{ |
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ax25_cb *s; |
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spin_lock_bh(&ax25_list_lock); |
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ax25_for_each(s, &ax25_list) { |
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if (s->sk && s->sk->sk_type != SOCK_SEQPACKET) |
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continue; |
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if (s->ax25_dev == NULL) |
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continue; |
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if (ax25cmp(&s->source_addr, src_addr) == 0 && ax25cmp(&s->dest_addr, dest_addr) == 0 && s->ax25_dev->dev == dev) { |
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if (digi != NULL && digi->ndigi != 0) { |
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if (s->digipeat == NULL) |
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continue; |
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if (ax25digicmp(s->digipeat, digi) != 0) |
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continue; |
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} else { |
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if (s->digipeat != NULL && s->digipeat->ndigi != 0) |
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continue; |
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} |
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ax25_cb_hold(s); |
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spin_unlock_bh(&ax25_list_lock); |
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return s; |
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} |
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} |
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spin_unlock_bh(&ax25_list_lock); |
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return NULL; |
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} |
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EXPORT_SYMBOL(ax25_find_cb); |
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void ax25_send_to_raw(ax25_address *addr, struct sk_buff *skb, int proto) |
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{ |
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ax25_cb *s; |
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struct sk_buff *copy; |
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spin_lock(&ax25_list_lock); |
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ax25_for_each(s, &ax25_list) { |
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if (s->sk != NULL && ax25cmp(&s->source_addr, addr) == 0 && |
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s->sk->sk_type == SOCK_RAW && |
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s->sk->sk_protocol == proto && |
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s->ax25_dev->dev == skb->dev && |
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atomic_read(&s->sk->sk_rmem_alloc) <= s->sk->sk_rcvbuf) { |
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if ((copy = skb_clone(skb, GFP_ATOMIC)) == NULL) |
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continue; |
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if (sock_queue_rcv_skb(s->sk, copy) != 0) |
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kfree_skb(copy); |
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} |
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} |
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spin_unlock(&ax25_list_lock); |
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} |
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/* |
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* Deferred destroy. |
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*/ |
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void ax25_destroy_socket(ax25_cb *); |
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/* |
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* Handler for deferred kills. |
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*/ |
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static void ax25_destroy_timer(struct timer_list *t) |
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{ |
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ax25_cb *ax25 = from_timer(ax25, t, dtimer); |
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struct sock *sk; |
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sk=ax25->sk; |
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bh_lock_sock(sk); |
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sock_hold(sk); |
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ax25_destroy_socket(ax25); |
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bh_unlock_sock(sk); |
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sock_put(sk); |
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} |
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/* |
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* This is called from user mode and the timers. Thus it protects itself |
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* against interrupt users but doesn't worry about being called during |
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* work. Once it is removed from the queue no interrupt or bottom half |
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* will touch it and we are (fairly 8-) ) safe. |
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*/ |
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void ax25_destroy_socket(ax25_cb *ax25) |
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{ |
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struct sk_buff *skb; |
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ax25_cb_del(ax25); |
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ax25_stop_heartbeat(ax25); |
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ax25_stop_t1timer(ax25); |
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ax25_stop_t2timer(ax25); |
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ax25_stop_t3timer(ax25); |
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ax25_stop_idletimer(ax25); |
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ax25_clear_queues(ax25); /* Flush the queues */ |
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if (ax25->sk != NULL) { |
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while ((skb = skb_dequeue(&ax25->sk->sk_receive_queue)) != NULL) { |
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if (skb->sk != ax25->sk) { |
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/* A pending connection */ |
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ax25_cb *sax25 = sk_to_ax25(skb->sk); |
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/* Queue the unaccepted socket for death */ |
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sock_orphan(skb->sk); |
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/* 9A4GL: hack to release unaccepted sockets */ |
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skb->sk->sk_state = TCP_LISTEN; |
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ax25_start_heartbeat(sax25); |
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sax25->state = AX25_STATE_0; |
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} |
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kfree_skb(skb); |
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} |
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skb_queue_purge(&ax25->sk->sk_write_queue); |
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} |
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if (ax25->sk != NULL) { |
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if (sk_has_allocations(ax25->sk)) { |
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/* Defer: outstanding buffers */ |
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timer_setup(&ax25->dtimer, ax25_destroy_timer, 0); |
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ax25->dtimer.expires = jiffies + 2 * HZ; |
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add_timer(&ax25->dtimer); |
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} else { |
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struct sock *sk=ax25->sk; |
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ax25->sk=NULL; |
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sock_put(sk); |
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} |
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} else { |
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ax25_cb_put(ax25); |
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} |
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} |
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/* |
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* dl1bke 960311: set parameters for existing AX.25 connections, |
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* includes a KILL command to abort any connection. |
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* VERY useful for debugging ;-) |
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*/ |
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static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg) |
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{ |
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struct ax25_ctl_struct ax25_ctl; |
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ax25_digi digi; |
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ax25_dev *ax25_dev; |
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ax25_cb *ax25; |
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unsigned int k; |
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int ret = 0; |
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if (copy_from_user(&ax25_ctl, arg, sizeof(ax25_ctl))) |
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return -EFAULT; |
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if ((ax25_dev = ax25_addr_ax25dev(&ax25_ctl.port_addr)) == NULL) |
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return -ENODEV; |
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if (ax25_ctl.digi_count > AX25_MAX_DIGIS) |
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return -EINVAL; |
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if (ax25_ctl.arg > ULONG_MAX / HZ && ax25_ctl.cmd != AX25_KILL) |
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return -EINVAL; |
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digi.ndigi = ax25_ctl.digi_count; |
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for (k = 0; k < digi.ndigi; k++) |
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digi.calls[k] = ax25_ctl.digi_addr[k]; |
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if ((ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev)) == NULL) |
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return -ENOTCONN; |
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switch (ax25_ctl.cmd) { |
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case AX25_KILL: |
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ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); |
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#ifdef CONFIG_AX25_DAMA_SLAVE |
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if (ax25_dev->dama.slave && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE) |
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ax25_dama_off(ax25); |
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#endif |
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ax25_disconnect(ax25, ENETRESET); |
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break; |
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case AX25_WINDOW: |
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if (ax25->modulus == AX25_MODULUS) { |
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if (ax25_ctl.arg < 1 || ax25_ctl.arg > 7) |
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goto einval_put; |
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} else { |
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if (ax25_ctl.arg < 1 || ax25_ctl.arg > 63) |
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goto einval_put; |
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} |
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ax25->window = ax25_ctl.arg; |
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break; |
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case AX25_T1: |
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if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ) |
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goto einval_put; |
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ax25->rtt = (ax25_ctl.arg * HZ) / 2; |
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ax25->t1 = ax25_ctl.arg * HZ; |
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break; |
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case AX25_T2: |
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if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ) |
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goto einval_put; |
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ax25->t2 = ax25_ctl.arg * HZ; |
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break; |
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case AX25_N2: |
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if (ax25_ctl.arg < 1 || ax25_ctl.arg > 31) |
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goto einval_put; |
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ax25->n2count = 0; |
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ax25->n2 = ax25_ctl.arg; |
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break; |
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case AX25_T3: |
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if (ax25_ctl.arg > ULONG_MAX / HZ) |
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goto einval_put; |
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ax25->t3 = ax25_ctl.arg * HZ; |
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break; |
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case AX25_IDLE: |
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if (ax25_ctl.arg > ULONG_MAX / (60 * HZ)) |
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goto einval_put; |
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ax25->idle = ax25_ctl.arg * 60 * HZ; |
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break; |
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case AX25_PACLEN: |
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if (ax25_ctl.arg < 16 || ax25_ctl.arg > 65535) |
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goto einval_put; |
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ax25->paclen = ax25_ctl.arg; |
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break; |
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default: |
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goto einval_put; |
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} |
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out_put: |
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ax25_cb_put(ax25); |
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return ret; |
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einval_put: |
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ret = -EINVAL; |
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goto out_put; |
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} |
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static void ax25_fillin_cb_from_dev(ax25_cb *ax25, ax25_dev *ax25_dev) |
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{ |
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ax25->rtt = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]) / 2; |
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ax25->t1 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]); |
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ax25->t2 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T2]); |
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ax25->t3 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T3]); |
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ax25->n2 = ax25_dev->values[AX25_VALUES_N2]; |
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ax25->paclen = ax25_dev->values[AX25_VALUES_PACLEN]; |
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ax25->idle = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_IDLE]); |
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ax25->backoff = ax25_dev->values[AX25_VALUES_BACKOFF]; |
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if (ax25_dev->values[AX25_VALUES_AXDEFMODE]) { |
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ax25->modulus = AX25_EMODULUS; |
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ax25->window = ax25_dev->values[AX25_VALUES_EWINDOW]; |
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} else { |
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ax25->modulus = AX25_MODULUS; |
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ax25->window = ax25_dev->values[AX25_VALUES_WINDOW]; |
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} |
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} |
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/* |
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* Fill in a created AX.25 created control block with the default |
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* values for a particular device. |
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*/ |
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void ax25_fillin_cb(ax25_cb *ax25, ax25_dev *ax25_dev) |
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{ |
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ax25->ax25_dev = ax25_dev; |
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if (ax25->ax25_dev != NULL) { |
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ax25_fillin_cb_from_dev(ax25, ax25_dev); |
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return; |
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} |
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/* |
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* No device, use kernel / AX.25 spec default values |
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*/ |
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ax25->rtt = msecs_to_jiffies(AX25_DEF_T1) / 2; |
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ax25->t1 = msecs_to_jiffies(AX25_DEF_T1); |
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ax25->t2 = msecs_to_jiffies(AX25_DEF_T2); |
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ax25->t3 = msecs_to_jiffies(AX25_DEF_T3); |
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ax25->n2 = AX25_DEF_N2; |
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ax25->paclen = AX25_DEF_PACLEN; |
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ax25->idle = msecs_to_jiffies(AX25_DEF_IDLE); |
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ax25->backoff = AX25_DEF_BACKOFF; |
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if (AX25_DEF_AXDEFMODE) { |
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ax25->modulus = AX25_EMODULUS; |
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ax25->window = AX25_DEF_EWINDOW; |
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} else { |
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ax25->modulus = AX25_MODULUS; |
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ax25->window = AX25_DEF_WINDOW; |
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} |
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} |
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/* |
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* Create an empty AX.25 control block. |
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*/ |
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ax25_cb *ax25_create_cb(void) |
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{ |
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ax25_cb *ax25; |
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if ((ax25 = kzalloc(sizeof(*ax25), GFP_ATOMIC)) == NULL) |
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return NULL; |
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refcount_set(&ax25->refcount, 1); |
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skb_queue_head_init(&ax25->write_queue); |
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skb_queue_head_init(&ax25->frag_queue); |
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skb_queue_head_init(&ax25->ack_queue); |
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skb_queue_head_init(&ax25->reseq_queue); |
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ax25_setup_timers(ax25); |
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ax25_fillin_cb(ax25, NULL); |
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ax25->state = AX25_STATE_0; |
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return ax25; |
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} |
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|
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/* |
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* Handling for system calls applied via the various interfaces to an |
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* AX25 socket object |
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*/ |
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static int ax25_setsockopt(struct socket *sock, int level, int optname, |
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sockptr_t optval, unsigned int optlen) |
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{ |
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struct sock *sk = sock->sk; |
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ax25_cb *ax25; |
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struct net_device *dev; |
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char devname[IFNAMSIZ]; |
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unsigned long opt; |
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int res = 0; |
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if (level != SOL_AX25) |
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return -ENOPROTOOPT; |
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if (optlen < sizeof(unsigned int)) |
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return -EINVAL; |
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|
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if (copy_from_sockptr(&opt, optval, sizeof(unsigned int))) |
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return -EFAULT; |
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lock_sock(sk); |
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ax25 = sk_to_ax25(sk); |
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|
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switch (optname) { |
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case AX25_WINDOW: |
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if (ax25->modulus == AX25_MODULUS) { |
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if (opt < 1 || opt > 7) { |
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res = -EINVAL; |
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break; |
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} |
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} 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 - 1) |
|
optlen = IFNAMSIZ - 1; |
|
|
|
memset(devname, 0, sizeof(devname)); |
|
|
|
if (copy_from_sockptr(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 > U8_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; |
|
break; |
|
#endif |
|
default: |
|
break; |
|
} |
|
break; |
|
|
|
case SOCK_RAW: |
|
if (!capable(CAP_NET_RAW)) |
|
return -EPERM; |
|
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 || |
|
addr_len < sizeof(struct sockaddr_ax25) + |
|
sizeof(ax25_address) * fsa->fsa_ax25.sax25_ndigis) { |
|
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 [email protected]\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_acceptq_removed(sk); |
|
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 || |
|
addr_len < sizeof(struct sockaddr_ax25) + |
|
sizeof(ax25_address) * usax->sax25_ndigis) { |
|
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 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, "%p %s %s%s ", |
|
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, |
|
.gettstamp = sock_gettstamp, |
|
.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 <[email protected]>"); |
|
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);
|
|
|