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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Hyunwoo Kim](/assets/img/avatar_default.png)
If you call listen() and accept() on an already connect()ed
AF_NETROM socket, accept() can successfully connect.
This is because when the peer socket sends data to sendmsg,
the skb with its own sk stored in the connected socket's
sk->sk_receive_queue is connected, and nr_accept() dequeues
the skb waiting in the sk->sk_receive_queue.
As a result, nr_accept() allocates and returns a sock with
the sk of the parent AF_NETROM socket.
And here use-after-free can happen through complex race conditions:
```
cpu0 cpu1
1. socket_2 = socket(AF_NETROM)
.
.
listen(socket_2)
accepted_socket = accept(socket_2)
2. socket_1 = socket(AF_NETROM)
nr_create() // sk refcount : 1
connect(socket_1)
3. write(accepted_socket)
nr_sendmsg()
nr_output()
nr_kick()
nr_send_iframe()
nr_transmit_buffer()
nr_route_frame()
nr_loopback_queue()
nr_loopback_timer()
nr_rx_frame()
nr_process_rx_frame(sk, skb); // sk : socket_1's sk
nr_state3_machine()
nr_queue_rx_frame()
sock_queue_rcv_skb()
sock_queue_rcv_skb_reason()
__sock_queue_rcv_skb()
__skb_queue_tail(list, skb); // list : socket_1's sk->sk_receive_queue
4. listen(socket_1)
nr_listen()
uaf_socket = accept(socket_1)
nr_accept()
skb_dequeue(&sk->sk_receive_queue);
5. close(accepted_socket)
nr_release()
nr_write_internal(sk, NR_DISCREQ)
nr_transmit_buffer() // NR_DISCREQ
nr_route_frame()
nr_loopback_queue()
nr_loopback_timer()
nr_rx_frame() // sk : socket_1's sk
nr_process_rx_frame() // NR_STATE_3
nr_state3_machine() // NR_DISCREQ
nr_disconnect()
nr_sk(sk)->state = NR_STATE_0;
6. close(socket_1) // sk refcount : 3
nr_release() // NR_STATE_0
sock_put(sk); // sk refcount : 0
sk_free(sk);
close(uaf_socket)
nr_release()
sock_hold(sk); // UAF
```
KASAN report by syzbot:
```
BUG: KASAN: use-after-free in nr_release+0x66/0x460 net/netrom/af_netrom.c:520
Write of size 4 at addr ffff8880235d8080 by task syz-executor564/5128
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:306 [inline]
print_report+0x15e/0x461 mm/kasan/report.c:417
kasan_report+0xbf/0x1f0 mm/kasan/report.c:517
check_region_inline mm/kasan/generic.c:183 [inline]
kasan_check_range+0x141/0x190 mm/kasan/generic.c:189
instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:116 [inline]
__refcount_add include/linux/refcount.h:193 [inline]
__refcount_inc include/linux/refcount.h:250 [inline]
refcount_inc include/linux/refcount.h:267 [inline]
sock_hold include/net/sock.h:775 [inline]
nr_release+0x66/0x460 net/netrom/af_netrom.c:520
__sock_release+0xcd/0x280 net/socket.c:650
sock_close+0x1c/0x20 net/socket.c:1365
__fput+0x27c/0xa90 fs/file_table.c:320
task_work_run+0x16f/0x270 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0xaa8/0x2950 kernel/exit.c:867
do_group_exit+0xd4/0x2a0 kernel/exit.c:1012
get_signal+0x21c3/0x2450 kernel/signal.c:2859
arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296
do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f6c19e3c9b9
Code: Unable to access opcode bytes at 0x7f6c19e3c98f.
RSP: 002b:00007fffd4ba2ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: 0000000000000116 RBX: 0000000000000003 RCX: 00007f6c19e3c9b9
RDX: 0000000000000318 RSI: 00000000200bd000 RDI: 0000000000000006
RBP: 0000000000000003 R08: 000000000000000d R09: 000000000000000d
R10: 0000000000000000 R11: 0000000000000246 R12: 000055555566a2c0
R13: 0000000000000011 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Allocated by task 5128:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:371 [inline]
____kasan_kmalloc mm/kasan/common.c:330 [inline]
__kasan_kmalloc+0xa3/0xb0 mm/kasan/common.c:380
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slab_common.c:968 [inline]
__kmalloc+0x5a/0xd0 mm/slab_common.c:981
kmalloc include/linux/slab.h:584 [inline]
sk_prot_alloc+0x140/0x290 net/core/sock.c:2038
sk_alloc+0x3a/0x7a0 net/core/sock.c:2091
nr_create+0xb6/0x5f0 net/netrom/af_netrom.c:433
__sock_create+0x359/0x790 net/socket.c:1515
sock_create net/socket.c:1566 [inline]
__sys_socket_create net/socket.c:1603 [inline]
__sys_socket_create net/socket.c:1588 [inline]
__sys_socket+0x133/0x250 net/socket.c:1636
__do_sys_socket net/socket.c:1649 [inline]
__se_sys_socket net/socket.c:1647 [inline]
__x64_sys_socket+0x73/0xb0 net/socket.c:1647
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Freed by task 5128:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:518
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x13b/0x1a0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:177 [inline]
__cache_free mm/slab.c:3394 [inline]
__do_kmem_cache_free mm/slab.c:3580 [inline]
__kmem_cache_free+0xcd/0x3b0 mm/slab.c:3587
sk_prot_free net/core/sock.c:2074 [inline]
__sk_destruct+0x5df/0x750 net/core/sock.c:2166
sk_destruct net/core/sock.c:2181 [inline]
__sk_free+0x175/0x460 net/core/sock.c:2192
sk_free+0x7c/0xa0 net/core/sock.c:2203
sock_put include/net/sock.h:1991 [inline]
nr_release+0x39e/0x460 net/netrom/af_netrom.c:554
__sock_release+0xcd/0x280 net/socket.c:650
sock_close+0x1c/0x20 net/socket.c:1365
__fput+0x27c/0xa90 fs/file_table.c:320
task_work_run+0x16f/0x270 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0xaa8/0x2950 kernel/exit.c:867
do_group_exit+0xd4/0x2a0 kernel/exit.c:1012
get_signal+0x21c3/0x2450 kernel/signal.c:2859
arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296
do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
```
To fix this issue, nr_listen() returns -EINVAL for sockets that
successfully nr_connect().
Reported-by: syzbot+caa188bdfc1eeafeb418@syzkaller.appspotmail.com
Fixes: 1da177e4c3
("Linux-2.6.12-rc2")
Signed-off-by: Hyunwoo Kim <v4bel@theori.io>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1532 lines
32 KiB
C
1532 lines
32 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*
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* Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
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* Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
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* Copyright Darryl Miles G7LED (dlm@g7led.demon.co.uk)
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/capability.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/slab.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/stat.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/net_namespace.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 <net/netrom.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <net/ip.h>
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#include <net/tcp_states.h>
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#include <net/arp.h>
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#include <linux/init.h>
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static int nr_ndevs = 4;
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int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL;
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int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS;
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int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL;
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int sysctl_netrom_transport_timeout = NR_DEFAULT_T1;
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int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2;
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int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2;
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int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4;
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int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW;
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int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE;
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int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING;
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int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS;
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int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET;
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static unsigned short circuit = 0x101;
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static HLIST_HEAD(nr_list);
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static DEFINE_SPINLOCK(nr_list_lock);
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static const struct proto_ops nr_proto_ops;
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/*
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* NETROM network devices are virtual network devices encapsulating NETROM
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* frames into AX.25 which will be sent through an AX.25 device, so form a
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* special "super class" of normal net devices; split their locks off into a
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* separate class since they always nest.
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*/
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static struct lock_class_key nr_netdev_xmit_lock_key;
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static struct lock_class_key nr_netdev_addr_lock_key;
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static void nr_set_lockdep_one(struct net_device *dev,
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struct netdev_queue *txq,
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void *_unused)
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{
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lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key);
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}
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static void nr_set_lockdep_key(struct net_device *dev)
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{
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lockdep_set_class(&dev->addr_list_lock, &nr_netdev_addr_lock_key);
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netdev_for_each_tx_queue(dev, nr_set_lockdep_one, NULL);
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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 nr_remove_socket(struct sock *sk)
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{
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spin_lock_bh(&nr_list_lock);
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sk_del_node_init(sk);
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spin_unlock_bh(&nr_list_lock);
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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 nr_kill_by_device(struct net_device *dev)
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{
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struct sock *s;
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spin_lock_bh(&nr_list_lock);
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sk_for_each(s, &nr_list)
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if (nr_sk(s)->device == dev)
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nr_disconnect(s, ENETUNREACH);
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spin_unlock_bh(&nr_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 nr_device_event(struct notifier_block *this, unsigned long event, 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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if (event != NETDEV_DOWN)
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return NOTIFY_DONE;
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nr_kill_by_device(dev);
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nr_rt_device_down(dev);
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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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static void nr_insert_socket(struct sock *sk)
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{
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spin_lock_bh(&nr_list_lock);
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sk_add_node(sk, &nr_list);
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spin_unlock_bh(&nr_list_lock);
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}
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/*
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* Find a socket that wants to accept the Connect Request we just
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* received.
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*/
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static struct sock *nr_find_listener(ax25_address *addr)
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{
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struct sock *s;
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spin_lock_bh(&nr_list_lock);
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sk_for_each(s, &nr_list)
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if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
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s->sk_state == TCP_LISTEN) {
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sock_hold(s);
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goto found;
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}
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s = NULL;
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found:
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spin_unlock_bh(&nr_list_lock);
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return s;
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}
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/*
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* Find a connected NET/ROM socket given my circuit IDs.
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*/
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static struct sock *nr_find_socket(unsigned char index, unsigned char id)
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{
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struct sock *s;
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spin_lock_bh(&nr_list_lock);
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sk_for_each(s, &nr_list) {
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struct nr_sock *nr = nr_sk(s);
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if (nr->my_index == index && nr->my_id == id) {
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sock_hold(s);
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goto found;
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}
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}
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s = NULL;
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found:
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spin_unlock_bh(&nr_list_lock);
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return s;
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}
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/*
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* Find a connected NET/ROM socket given their circuit IDs.
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*/
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static struct sock *nr_find_peer(unsigned char index, unsigned char id,
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ax25_address *dest)
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{
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struct sock *s;
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spin_lock_bh(&nr_list_lock);
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sk_for_each(s, &nr_list) {
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struct nr_sock *nr = nr_sk(s);
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if (nr->your_index == index && nr->your_id == id &&
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!ax25cmp(&nr->dest_addr, dest)) {
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sock_hold(s);
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goto found;
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}
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}
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s = NULL;
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found:
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spin_unlock_bh(&nr_list_lock);
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return s;
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}
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/*
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* Find next free circuit ID.
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*/
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static unsigned short nr_find_next_circuit(void)
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{
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unsigned short id = circuit;
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unsigned char i, j;
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struct sock *sk;
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for (;;) {
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i = id / 256;
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j = id % 256;
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if (i != 0 && j != 0) {
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if ((sk=nr_find_socket(i, j)) == NULL)
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break;
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sock_put(sk);
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}
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id++;
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}
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return id;
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}
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/*
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* Deferred destroy.
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*/
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void nr_destroy_socket(struct sock *);
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/*
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* Handler for deferred kills.
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*/
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static void nr_destroy_timer(struct timer_list *t)
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{
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struct sock *sk = from_timer(sk, t, sk_timer);
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bh_lock_sock(sk);
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sock_hold(sk);
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nr_destroy_socket(sk);
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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 nr_destroy_socket(struct sock *sk)
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{
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struct sk_buff *skb;
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nr_remove_socket(sk);
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nr_stop_heartbeat(sk);
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nr_stop_t1timer(sk);
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nr_stop_t2timer(sk);
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nr_stop_t4timer(sk);
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nr_stop_idletimer(sk);
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nr_clear_queues(sk); /* Flush the queues */
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while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
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if (skb->sk != sk) { /* A pending connection */
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/* Queue the unaccepted socket for death */
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sock_set_flag(skb->sk, SOCK_DEAD);
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nr_start_heartbeat(skb->sk);
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nr_sk(skb->sk)->state = NR_STATE_0;
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}
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kfree_skb(skb);
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}
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if (sk_has_allocations(sk)) {
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/* Defer: outstanding buffers */
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sk->sk_timer.function = nr_destroy_timer;
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sk->sk_timer.expires = jiffies + 2 * HZ;
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add_timer(&sk->sk_timer);
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} else
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sock_put(sk);
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}
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/*
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* Handling for system calls applied via the various interfaces to a
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* NET/ROM socket object.
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*/
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static int nr_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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struct nr_sock *nr = nr_sk(sk);
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unsigned int opt;
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if (level != SOL_NETROM)
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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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if (copy_from_sockptr(&opt, optval, sizeof(opt)))
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return -EFAULT;
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switch (optname) {
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case NETROM_T1:
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if (opt < 1 || opt > UINT_MAX / HZ)
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return -EINVAL;
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nr->t1 = opt * HZ;
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return 0;
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case NETROM_T2:
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if (opt < 1 || opt > UINT_MAX / HZ)
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return -EINVAL;
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nr->t2 = opt * HZ;
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return 0;
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case NETROM_N2:
|
|
if (opt < 1 || opt > 31)
|
|
return -EINVAL;
|
|
nr->n2 = opt;
|
|
return 0;
|
|
|
|
case NETROM_T4:
|
|
if (opt < 1 || opt > UINT_MAX / HZ)
|
|
return -EINVAL;
|
|
nr->t4 = opt * HZ;
|
|
return 0;
|
|
|
|
case NETROM_IDLE:
|
|
if (opt > UINT_MAX / (60 * HZ))
|
|
return -EINVAL;
|
|
nr->idle = opt * 60 * HZ;
|
|
return 0;
|
|
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
}
|
|
|
|
static int nr_getsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct nr_sock *nr = nr_sk(sk);
|
|
int val = 0;
|
|
int len;
|
|
|
|
if (level != SOL_NETROM)
|
|
return -ENOPROTOOPT;
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
if (len < 0)
|
|
return -EINVAL;
|
|
|
|
switch (optname) {
|
|
case NETROM_T1:
|
|
val = nr->t1 / HZ;
|
|
break;
|
|
|
|
case NETROM_T2:
|
|
val = nr->t2 / HZ;
|
|
break;
|
|
|
|
case NETROM_N2:
|
|
val = nr->n2;
|
|
break;
|
|
|
|
case NETROM_T4:
|
|
val = nr->t4 / HZ;
|
|
break;
|
|
|
|
case NETROM_IDLE:
|
|
val = nr->idle / (60 * HZ);
|
|
break;
|
|
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
len = min_t(unsigned int, len, sizeof(int));
|
|
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
return copy_to_user(optval, &val, len) ? -EFAULT : 0;
|
|
}
|
|
|
|
static int nr_listen(struct socket *sock, int backlog)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
lock_sock(sk);
|
|
if (sock->state != SS_UNCONNECTED) {
|
|
release_sock(sk);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (sk->sk_state != TCP_LISTEN) {
|
|
memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
|
|
sk->sk_max_ack_backlog = backlog;
|
|
sk->sk_state = TCP_LISTEN;
|
|
release_sock(sk);
|
|
return 0;
|
|
}
|
|
release_sock(sk);
|
|
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static struct proto nr_proto = {
|
|
.name = "NETROM",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct nr_sock),
|
|
};
|
|
|
|
static int nr_create(struct net *net, struct socket *sock, int protocol,
|
|
int kern)
|
|
{
|
|
struct sock *sk;
|
|
struct nr_sock *nr;
|
|
|
|
if (!net_eq(net, &init_net))
|
|
return -EAFNOSUPPORT;
|
|
|
|
if (sock->type != SOCK_SEQPACKET || protocol != 0)
|
|
return -ESOCKTNOSUPPORT;
|
|
|
|
sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto, kern);
|
|
if (sk == NULL)
|
|
return -ENOMEM;
|
|
|
|
nr = nr_sk(sk);
|
|
|
|
sock_init_data(sock, sk);
|
|
|
|
sock->ops = &nr_proto_ops;
|
|
sk->sk_protocol = protocol;
|
|
|
|
skb_queue_head_init(&nr->ack_queue);
|
|
skb_queue_head_init(&nr->reseq_queue);
|
|
skb_queue_head_init(&nr->frag_queue);
|
|
|
|
nr_init_timers(sk);
|
|
|
|
nr->t1 =
|
|
msecs_to_jiffies(sysctl_netrom_transport_timeout);
|
|
nr->t2 =
|
|
msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
|
|
nr->n2 =
|
|
msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
|
|
nr->t4 =
|
|
msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
|
|
nr->idle =
|
|
msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
|
|
nr->window = sysctl_netrom_transport_requested_window_size;
|
|
|
|
nr->bpqext = 1;
|
|
nr->state = NR_STATE_0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct sock *nr_make_new(struct sock *osk)
|
|
{
|
|
struct sock *sk;
|
|
struct nr_sock *nr, *onr;
|
|
|
|
if (osk->sk_type != SOCK_SEQPACKET)
|
|
return NULL;
|
|
|
|
sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot, 0);
|
|
if (sk == NULL)
|
|
return NULL;
|
|
|
|
nr = nr_sk(sk);
|
|
|
|
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);
|
|
|
|
skb_queue_head_init(&nr->ack_queue);
|
|
skb_queue_head_init(&nr->reseq_queue);
|
|
skb_queue_head_init(&nr->frag_queue);
|
|
|
|
nr_init_timers(sk);
|
|
|
|
onr = nr_sk(osk);
|
|
|
|
nr->t1 = onr->t1;
|
|
nr->t2 = onr->t2;
|
|
nr->n2 = onr->n2;
|
|
nr->t4 = onr->t4;
|
|
nr->idle = onr->idle;
|
|
nr->window = onr->window;
|
|
|
|
nr->device = onr->device;
|
|
nr->bpqext = onr->bpqext;
|
|
|
|
return sk;
|
|
}
|
|
|
|
static int nr_release(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct nr_sock *nr;
|
|
|
|
if (sk == NULL) return 0;
|
|
|
|
sock_hold(sk);
|
|
sock_orphan(sk);
|
|
lock_sock(sk);
|
|
nr = nr_sk(sk);
|
|
|
|
switch (nr->state) {
|
|
case NR_STATE_0:
|
|
case NR_STATE_1:
|
|
case NR_STATE_2:
|
|
nr_disconnect(sk, 0);
|
|
nr_destroy_socket(sk);
|
|
break;
|
|
|
|
case NR_STATE_3:
|
|
nr_clear_queues(sk);
|
|
nr->n2count = 0;
|
|
nr_write_internal(sk, NR_DISCREQ);
|
|
nr_start_t1timer(sk);
|
|
nr_stop_t2timer(sk);
|
|
nr_stop_t4timer(sk);
|
|
nr_stop_idletimer(sk);
|
|
nr->state = NR_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;
|
|
}
|
|
|
|
sock->sk = NULL;
|
|
release_sock(sk);
|
|
sock_put(sk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct nr_sock *nr = nr_sk(sk);
|
|
struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
|
|
struct net_device *dev;
|
|
ax25_uid_assoc *user;
|
|
ax25_address *source;
|
|
|
|
lock_sock(sk);
|
|
if (!sock_flag(sk, SOCK_ZAPPED)) {
|
|
release_sock(sk);
|
|
return -EINVAL;
|
|
}
|
|
if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
|
|
release_sock(sk);
|
|
return -EINVAL;
|
|
}
|
|
if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
|
|
release_sock(sk);
|
|
return -EINVAL;
|
|
}
|
|
if (addr->fsa_ax25.sax25_family != AF_NETROM) {
|
|
release_sock(sk);
|
|
return -EINVAL;
|
|
}
|
|
if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
|
|
release_sock(sk);
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
|
|
/*
|
|
* Only the super user can set an arbitrary user callsign.
|
|
*/
|
|
if (addr->fsa_ax25.sax25_ndigis == 1) {
|
|
if (!capable(CAP_NET_BIND_SERVICE)) {
|
|
dev_put(dev);
|
|
release_sock(sk);
|
|
return -EPERM;
|
|
}
|
|
nr->user_addr = addr->fsa_digipeater[0];
|
|
nr->source_addr = addr->fsa_ax25.sax25_call;
|
|
} else {
|
|
source = &addr->fsa_ax25.sax25_call;
|
|
|
|
user = ax25_findbyuid(current_euid());
|
|
if (user) {
|
|
nr->user_addr = user->call;
|
|
ax25_uid_put(user);
|
|
} else {
|
|
if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
|
|
release_sock(sk);
|
|
dev_put(dev);
|
|
return -EPERM;
|
|
}
|
|
nr->user_addr = *source;
|
|
}
|
|
|
|
nr->source_addr = *source;
|
|
}
|
|
|
|
nr->device = dev;
|
|
nr_insert_socket(sk);
|
|
|
|
sock_reset_flag(sk, SOCK_ZAPPED);
|
|
dev_put(dev);
|
|
release_sock(sk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
|
|
int addr_len, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct nr_sock *nr = nr_sk(sk);
|
|
struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
|
|
const ax25_address *source = NULL;
|
|
ax25_uid_assoc *user;
|
|
struct net_device *dev;
|
|
int err = 0;
|
|
|
|
lock_sock(sk);
|
|
if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
|
|
sock->state = SS_CONNECTED;
|
|
goto out_release; /* Connect completed during a ERESTARTSYS event */
|
|
}
|
|
|
|
if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
|
|
sock->state = SS_UNCONNECTED;
|
|
err = -ECONNREFUSED;
|
|
goto out_release;
|
|
}
|
|
|
|
if (sk->sk_state == TCP_ESTABLISHED) {
|
|
err = -EISCONN; /* No reconnect on a seqpacket socket */
|
|
goto out_release;
|
|
}
|
|
|
|
sk->sk_state = TCP_CLOSE;
|
|
sock->state = SS_UNCONNECTED;
|
|
|
|
if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
|
|
err = -EINVAL;
|
|
goto out_release;
|
|
}
|
|
if (addr->sax25_family != AF_NETROM) {
|
|
err = -EINVAL;
|
|
goto out_release;
|
|
}
|
|
if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */
|
|
sock_reset_flag(sk, SOCK_ZAPPED);
|
|
|
|
if ((dev = nr_dev_first()) == NULL) {
|
|
err = -ENETUNREACH;
|
|
goto out_release;
|
|
}
|
|
source = (const ax25_address *)dev->dev_addr;
|
|
|
|
user = ax25_findbyuid(current_euid());
|
|
if (user) {
|
|
nr->user_addr = user->call;
|
|
ax25_uid_put(user);
|
|
} else {
|
|
if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
|
|
dev_put(dev);
|
|
err = -EPERM;
|
|
goto out_release;
|
|
}
|
|
nr->user_addr = *source;
|
|
}
|
|
|
|
nr->source_addr = *source;
|
|
nr->device = dev;
|
|
|
|
dev_put(dev);
|
|
nr_insert_socket(sk); /* Finish the bind */
|
|
}
|
|
|
|
nr->dest_addr = addr->sax25_call;
|
|
|
|
release_sock(sk);
|
|
circuit = nr_find_next_circuit();
|
|
lock_sock(sk);
|
|
|
|
nr->my_index = circuit / 256;
|
|
nr->my_id = circuit % 256;
|
|
|
|
circuit++;
|
|
|
|
/* Move to connecting socket, start sending Connect Requests */
|
|
sock->state = SS_CONNECTING;
|
|
sk->sk_state = TCP_SYN_SENT;
|
|
|
|
nr_establish_data_link(sk);
|
|
|
|
nr->state = NR_STATE_1;
|
|
|
|
nr_start_heartbeat(sk);
|
|
|
|
/* Now the loop */
|
|
if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
|
|
err = -EINPROGRESS;
|
|
goto out_release;
|
|
}
|
|
|
|
/*
|
|
* A Connect Ack with Choke or timeout or failed routing will go to
|
|
* closed.
|
|
*/
|
|
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) {
|
|
sock->state = SS_UNCONNECTED;
|
|
err = sock_error(sk); /* Always set at this point */
|
|
goto out_release;
|
|
}
|
|
|
|
sock->state = SS_CONNECTED;
|
|
|
|
out_release:
|
|
release_sock(sk);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int nr_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 ((sk = sock->sk) == NULL)
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
if (sk->sk_type != SOCK_SEQPACKET) {
|
|
err = -EOPNOTSUPP;
|
|
goto out_release;
|
|
}
|
|
|
|
if (sk->sk_state != TCP_LISTEN) {
|
|
err = -EINVAL;
|
|
goto out_release;
|
|
}
|
|
|
|
/*
|
|
* The write 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_release;
|
|
|
|
newsk = skb->sk;
|
|
sock_graft(newsk, newsock);
|
|
|
|
/* Now attach up the new socket */
|
|
kfree_skb(skb);
|
|
sk_acceptq_removed(sk);
|
|
|
|
out_release:
|
|
release_sock(sk);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
|
|
int peer)
|
|
{
|
|
struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
|
|
struct sock *sk = sock->sk;
|
|
struct nr_sock *nr = nr_sk(sk);
|
|
int uaddr_len;
|
|
|
|
memset(&sax->fsa_ax25, 0, sizeof(struct sockaddr_ax25));
|
|
|
|
lock_sock(sk);
|
|
if (peer != 0) {
|
|
if (sk->sk_state != TCP_ESTABLISHED) {
|
|
release_sock(sk);
|
|
return -ENOTCONN;
|
|
}
|
|
sax->fsa_ax25.sax25_family = AF_NETROM;
|
|
sax->fsa_ax25.sax25_ndigis = 1;
|
|
sax->fsa_ax25.sax25_call = nr->user_addr;
|
|
memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater));
|
|
sax->fsa_digipeater[0] = nr->dest_addr;
|
|
uaddr_len = sizeof(struct full_sockaddr_ax25);
|
|
} else {
|
|
sax->fsa_ax25.sax25_family = AF_NETROM;
|
|
sax->fsa_ax25.sax25_ndigis = 0;
|
|
sax->fsa_ax25.sax25_call = nr->source_addr;
|
|
uaddr_len = sizeof(struct sockaddr_ax25);
|
|
}
|
|
release_sock(sk);
|
|
|
|
return uaddr_len;
|
|
}
|
|
|
|
int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct sock *sk;
|
|
struct sock *make;
|
|
struct nr_sock *nr_make;
|
|
ax25_address *src, *dest, *user;
|
|
unsigned short circuit_index, circuit_id;
|
|
unsigned short peer_circuit_index, peer_circuit_id;
|
|
unsigned short frametype, flags, window, timeout;
|
|
int ret;
|
|
|
|
skb_orphan(skb);
|
|
|
|
/*
|
|
* skb->data points to the netrom frame start
|
|
*/
|
|
|
|
src = (ax25_address *)(skb->data + 0);
|
|
dest = (ax25_address *)(skb->data + 7);
|
|
|
|
circuit_index = skb->data[15];
|
|
circuit_id = skb->data[16];
|
|
peer_circuit_index = skb->data[17];
|
|
peer_circuit_id = skb->data[18];
|
|
frametype = skb->data[19] & 0x0F;
|
|
flags = skb->data[19] & 0xF0;
|
|
|
|
/*
|
|
* Check for an incoming IP over NET/ROM frame.
|
|
*/
|
|
if (frametype == NR_PROTOEXT &&
|
|
circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
|
|
skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
|
|
skb_reset_transport_header(skb);
|
|
|
|
return nr_rx_ip(skb, dev);
|
|
}
|
|
|
|
/*
|
|
* Find an existing socket connection, based on circuit ID, if it's
|
|
* a Connect Request base it on their circuit ID.
|
|
*
|
|
* Circuit ID 0/0 is not valid but it could still be a "reset" for a
|
|
* circuit that no longer exists at the other end ...
|
|
*/
|
|
|
|
sk = NULL;
|
|
|
|
if (circuit_index == 0 && circuit_id == 0) {
|
|
if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
|
|
sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
|
|
} else {
|
|
if (frametype == NR_CONNREQ)
|
|
sk = nr_find_peer(circuit_index, circuit_id, src);
|
|
else
|
|
sk = nr_find_socket(circuit_index, circuit_id);
|
|
}
|
|
|
|
if (sk != NULL) {
|
|
bh_lock_sock(sk);
|
|
skb_reset_transport_header(skb);
|
|
|
|
if (frametype == NR_CONNACK && skb->len == 22)
|
|
nr_sk(sk)->bpqext = 1;
|
|
else
|
|
nr_sk(sk)->bpqext = 0;
|
|
|
|
ret = nr_process_rx_frame(sk, skb);
|
|
bh_unlock_sock(sk);
|
|
sock_put(sk);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Now it should be a CONNREQ.
|
|
*/
|
|
if (frametype != NR_CONNREQ) {
|
|
/*
|
|
* Here it would be nice to be able to send a reset but
|
|
* NET/ROM doesn't have one. We've tried to extend the protocol
|
|
* by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
|
|
* apparently kills BPQ boxes... :-(
|
|
* So now we try to follow the established behaviour of
|
|
* G8PZT's Xrouter which is sending packets with command type 7
|
|
* as an extension of the protocol.
|
|
*/
|
|
if (sysctl_netrom_reset_circuit &&
|
|
(frametype != NR_RESET || flags != 0))
|
|
nr_transmit_reset(skb, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
sk = nr_find_listener(dest);
|
|
|
|
user = (ax25_address *)(skb->data + 21);
|
|
|
|
if (sk == NULL || sk_acceptq_is_full(sk) ||
|
|
(make = nr_make_new(sk)) == NULL) {
|
|
nr_transmit_refusal(skb, 0);
|
|
if (sk)
|
|
sock_put(sk);
|
|
return 0;
|
|
}
|
|
|
|
bh_lock_sock(sk);
|
|
|
|
window = skb->data[20];
|
|
|
|
sock_hold(make);
|
|
skb->sk = make;
|
|
skb->destructor = sock_efree;
|
|
make->sk_state = TCP_ESTABLISHED;
|
|
|
|
/* Fill in his circuit details */
|
|
nr_make = nr_sk(make);
|
|
nr_make->source_addr = *dest;
|
|
nr_make->dest_addr = *src;
|
|
nr_make->user_addr = *user;
|
|
|
|
nr_make->your_index = circuit_index;
|
|
nr_make->your_id = circuit_id;
|
|
|
|
bh_unlock_sock(sk);
|
|
circuit = nr_find_next_circuit();
|
|
bh_lock_sock(sk);
|
|
|
|
nr_make->my_index = circuit / 256;
|
|
nr_make->my_id = circuit % 256;
|
|
|
|
circuit++;
|
|
|
|
/* Window negotiation */
|
|
if (window < nr_make->window)
|
|
nr_make->window = window;
|
|
|
|
/* L4 timeout negotiation */
|
|
if (skb->len == 37) {
|
|
timeout = skb->data[36] * 256 + skb->data[35];
|
|
if (timeout * HZ < nr_make->t1)
|
|
nr_make->t1 = timeout * HZ;
|
|
nr_make->bpqext = 1;
|
|
} else {
|
|
nr_make->bpqext = 0;
|
|
}
|
|
|
|
nr_write_internal(make, NR_CONNACK);
|
|
|
|
nr_make->condition = 0x00;
|
|
nr_make->vs = 0;
|
|
nr_make->va = 0;
|
|
nr_make->vr = 0;
|
|
nr_make->vl = 0;
|
|
nr_make->state = NR_STATE_3;
|
|
sk_acceptq_added(sk);
|
|
skb_queue_head(&sk->sk_receive_queue, skb);
|
|
|
|
if (!sock_flag(sk, SOCK_DEAD))
|
|
sk->sk_data_ready(sk);
|
|
|
|
bh_unlock_sock(sk);
|
|
sock_put(sk);
|
|
|
|
nr_insert_socket(make);
|
|
|
|
nr_start_heartbeat(make);
|
|
nr_start_idletimer(make);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int nr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct nr_sock *nr = nr_sk(sk);
|
|
DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
|
|
int err;
|
|
struct sockaddr_ax25 sax;
|
|
struct sk_buff *skb;
|
|
unsigned char *asmptr;
|
|
int size;
|
|
|
|
if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
|
|
return -EINVAL;
|
|
|
|
lock_sock(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 (nr->device == NULL) {
|
|
err = -ENETUNREACH;
|
|
goto out;
|
|
}
|
|
|
|
if (usax) {
|
|
if (msg->msg_namelen < sizeof(sax)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
sax = *usax;
|
|
if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
|
|
err = -EISCONN;
|
|
goto out;
|
|
}
|
|
if (sax.sax25_family != AF_NETROM) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
} else {
|
|
if (sk->sk_state != TCP_ESTABLISHED) {
|
|
err = -ENOTCONN;
|
|
goto out;
|
|
}
|
|
sax.sax25_family = AF_NETROM;
|
|
sax.sax25_call = nr->dest_addr;
|
|
}
|
|
|
|
/* Build a packet - the conventional user limit is 236 bytes. We can
|
|
do ludicrously large NetROM frames but must not overflow */
|
|
if (len > 65536) {
|
|
err = -EMSGSIZE;
|
|
goto out;
|
|
}
|
|
|
|
size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
|
|
|
|
if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
|
|
goto out;
|
|
|
|
skb_reserve(skb, size - len);
|
|
skb_reset_transport_header(skb);
|
|
|
|
/*
|
|
* Push down the NET/ROM header
|
|
*/
|
|
|
|
asmptr = skb_push(skb, NR_TRANSPORT_LEN);
|
|
|
|
/* Build a NET/ROM Transport header */
|
|
|
|
*asmptr++ = nr->your_index;
|
|
*asmptr++ = nr->your_id;
|
|
*asmptr++ = 0; /* To be filled in later */
|
|
*asmptr++ = 0; /* Ditto */
|
|
*asmptr++ = NR_INFO;
|
|
|
|
/*
|
|
* Put the data on the end
|
|
*/
|
|
skb_put(skb, len);
|
|
|
|
/* User data follows immediately after the NET/ROM transport header */
|
|
if (memcpy_from_msg(skb_transport_header(skb), msg, len)) {
|
|
kfree_skb(skb);
|
|
err = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
if (sk->sk_state != TCP_ESTABLISHED) {
|
|
kfree_skb(skb);
|
|
err = -ENOTCONN;
|
|
goto out;
|
|
}
|
|
|
|
nr_output(sk, skb); /* Shove it onto the queue */
|
|
|
|
err = len;
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int nr_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
|
|
int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
|
|
size_t copied;
|
|
struct sk_buff *skb;
|
|
int er;
|
|
|
|
/*
|
|
* This works for seqpacket too. The receiver has ordered the queue for
|
|
* us! We do one quick check first though
|
|
*/
|
|
|
|
lock_sock(sk);
|
|
if (sk->sk_state != TCP_ESTABLISHED) {
|
|
release_sock(sk);
|
|
return -ENOTCONN;
|
|
}
|
|
|
|
/* Now we can treat all alike */
|
|
skb = skb_recv_datagram(sk, flags, &er);
|
|
if (!skb) {
|
|
release_sock(sk);
|
|
return er;
|
|
}
|
|
|
|
skb_reset_transport_header(skb);
|
|
copied = skb->len;
|
|
|
|
if (copied > size) {
|
|
copied = size;
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
}
|
|
|
|
er = skb_copy_datagram_msg(skb, 0, msg, copied);
|
|
if (er < 0) {
|
|
skb_free_datagram(sk, skb);
|
|
release_sock(sk);
|
|
return er;
|
|
}
|
|
|
|
if (sax != NULL) {
|
|
memset(sax, 0, sizeof(*sax));
|
|
sax->sax25_family = AF_NETROM;
|
|
skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
|
|
AX25_ADDR_LEN);
|
|
msg->msg_namelen = sizeof(*sax);
|
|
}
|
|
|
|
skb_free_datagram(sk, skb);
|
|
|
|
release_sock(sk);
|
|
return copied;
|
|
}
|
|
|
|
|
|
static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
switch (cmd) {
|
|
case TIOCOUTQ: {
|
|
long amount;
|
|
|
|
lock_sock(sk);
|
|
amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
|
|
if (amount < 0)
|
|
amount = 0;
|
|
release_sock(sk);
|
|
return put_user(amount, (int __user *)argp);
|
|
}
|
|
|
|
case TIOCINQ: {
|
|
struct sk_buff *skb;
|
|
long amount = 0L;
|
|
|
|
lock_sock(sk);
|
|
/* 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;
|
|
release_sock(sk);
|
|
return put_user(amount, (int __user *)argp);
|
|
}
|
|
|
|
case SIOCGIFADDR:
|
|
case SIOCSIFADDR:
|
|
case SIOCGIFDSTADDR:
|
|
case SIOCSIFDSTADDR:
|
|
case SIOCGIFBRDADDR:
|
|
case SIOCSIFBRDADDR:
|
|
case SIOCGIFNETMASK:
|
|
case SIOCSIFNETMASK:
|
|
case SIOCGIFMETRIC:
|
|
case SIOCSIFMETRIC:
|
|
return -EINVAL;
|
|
|
|
case SIOCADDRT:
|
|
case SIOCDELRT:
|
|
case SIOCNRDECOBS:
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
return nr_rt_ioctl(cmd, argp);
|
|
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
static void *nr_info_start(struct seq_file *seq, loff_t *pos)
|
|
__acquires(&nr_list_lock)
|
|
{
|
|
spin_lock_bh(&nr_list_lock);
|
|
return seq_hlist_start_head(&nr_list, *pos);
|
|
}
|
|
|
|
static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
return seq_hlist_next(v, &nr_list, pos);
|
|
}
|
|
|
|
static void nr_info_stop(struct seq_file *seq, void *v)
|
|
__releases(&nr_list_lock)
|
|
{
|
|
spin_unlock_bh(&nr_list_lock);
|
|
}
|
|
|
|
static int nr_info_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct sock *s = sk_entry(v);
|
|
struct net_device *dev;
|
|
struct nr_sock *nr;
|
|
const char *devname;
|
|
char buf[11];
|
|
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_puts(seq,
|
|
"user_addr dest_node src_node dev my your st vs vr va t1 t2 t4 idle n2 wnd Snd-Q Rcv-Q inode\n");
|
|
|
|
else {
|
|
|
|
bh_lock_sock(s);
|
|
nr = nr_sk(s);
|
|
|
|
if ((dev = nr->device) == NULL)
|
|
devname = "???";
|
|
else
|
|
devname = dev->name;
|
|
|
|
seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
|
|
seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
|
|
seq_printf(seq,
|
|
"%-9s %-3s %02X/%02X %02X/%02X %2d %3d %3d %3d %3lu/%03lu %2lu/%02lu %3lu/%03lu %3lu/%03lu %2d/%02d %3d %5d %5d %ld\n",
|
|
ax2asc(buf, &nr->source_addr),
|
|
devname,
|
|
nr->my_index,
|
|
nr->my_id,
|
|
nr->your_index,
|
|
nr->your_id,
|
|
nr->state,
|
|
nr->vs,
|
|
nr->vr,
|
|
nr->va,
|
|
ax25_display_timer(&nr->t1timer) / HZ,
|
|
nr->t1 / HZ,
|
|
ax25_display_timer(&nr->t2timer) / HZ,
|
|
nr->t2 / HZ,
|
|
ax25_display_timer(&nr->t4timer) / HZ,
|
|
nr->t4 / HZ,
|
|
ax25_display_timer(&nr->idletimer) / (60 * HZ),
|
|
nr->idle / (60 * HZ),
|
|
nr->n2count,
|
|
nr->n2,
|
|
nr->window,
|
|
sk_wmem_alloc_get(s),
|
|
sk_rmem_alloc_get(s),
|
|
s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
|
|
|
|
bh_unlock_sock(s);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations nr_info_seqops = {
|
|
.start = nr_info_start,
|
|
.next = nr_info_next,
|
|
.stop = nr_info_stop,
|
|
.show = nr_info_show,
|
|
};
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
static const struct net_proto_family nr_family_ops = {
|
|
.family = PF_NETROM,
|
|
.create = nr_create,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static const struct proto_ops nr_proto_ops = {
|
|
.family = PF_NETROM,
|
|
.owner = THIS_MODULE,
|
|
.release = nr_release,
|
|
.bind = nr_bind,
|
|
.connect = nr_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = nr_accept,
|
|
.getname = nr_getname,
|
|
.poll = datagram_poll,
|
|
.ioctl = nr_ioctl,
|
|
.gettstamp = sock_gettstamp,
|
|
.listen = nr_listen,
|
|
.shutdown = sock_no_shutdown,
|
|
.setsockopt = nr_setsockopt,
|
|
.getsockopt = nr_getsockopt,
|
|
.sendmsg = nr_sendmsg,
|
|
.recvmsg = nr_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage,
|
|
};
|
|
|
|
static struct notifier_block nr_dev_notifier = {
|
|
.notifier_call = nr_device_event,
|
|
};
|
|
|
|
static struct net_device **dev_nr;
|
|
|
|
static struct ax25_protocol nr_pid = {
|
|
.pid = AX25_P_NETROM,
|
|
.func = nr_route_frame
|
|
};
|
|
|
|
static struct ax25_linkfail nr_linkfail_notifier = {
|
|
.func = nr_link_failed,
|
|
};
|
|
|
|
static int __init nr_proto_init(void)
|
|
{
|
|
int i;
|
|
int rc = proto_register(&nr_proto, 0);
|
|
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
|
|
pr_err("NET/ROM: %s - nr_ndevs parameter too large\n",
|
|
__func__);
|
|
rc = -EINVAL;
|
|
goto unregister_proto;
|
|
}
|
|
|
|
dev_nr = kcalloc(nr_ndevs, sizeof(struct net_device *), GFP_KERNEL);
|
|
if (!dev_nr) {
|
|
pr_err("NET/ROM: %s - unable to allocate device array\n",
|
|
__func__);
|
|
rc = -ENOMEM;
|
|
goto unregister_proto;
|
|
}
|
|
|
|
for (i = 0; i < nr_ndevs; i++) {
|
|
char name[IFNAMSIZ];
|
|
struct net_device *dev;
|
|
|
|
sprintf(name, "nr%d", i);
|
|
dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, nr_setup);
|
|
if (!dev) {
|
|
rc = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
dev->base_addr = i;
|
|
rc = register_netdev(dev);
|
|
if (rc) {
|
|
free_netdev(dev);
|
|
goto fail;
|
|
}
|
|
nr_set_lockdep_key(dev);
|
|
dev_nr[i] = dev;
|
|
}
|
|
|
|
rc = sock_register(&nr_family_ops);
|
|
if (rc)
|
|
goto fail;
|
|
|
|
rc = register_netdevice_notifier(&nr_dev_notifier);
|
|
if (rc)
|
|
goto out_sock;
|
|
|
|
ax25_register_pid(&nr_pid);
|
|
ax25_linkfail_register(&nr_linkfail_notifier);
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
rc = nr_register_sysctl();
|
|
if (rc)
|
|
goto out_sysctl;
|
|
#endif
|
|
|
|
nr_loopback_init();
|
|
|
|
rc = -ENOMEM;
|
|
if (!proc_create_seq("nr", 0444, init_net.proc_net, &nr_info_seqops))
|
|
goto proc_remove1;
|
|
if (!proc_create_seq("nr_neigh", 0444, init_net.proc_net,
|
|
&nr_neigh_seqops))
|
|
goto proc_remove2;
|
|
if (!proc_create_seq("nr_nodes", 0444, init_net.proc_net,
|
|
&nr_node_seqops))
|
|
goto proc_remove3;
|
|
|
|
return 0;
|
|
|
|
proc_remove3:
|
|
remove_proc_entry("nr_neigh", init_net.proc_net);
|
|
proc_remove2:
|
|
remove_proc_entry("nr", init_net.proc_net);
|
|
proc_remove1:
|
|
|
|
nr_loopback_clear();
|
|
nr_rt_free();
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
nr_unregister_sysctl();
|
|
out_sysctl:
|
|
#endif
|
|
ax25_linkfail_release(&nr_linkfail_notifier);
|
|
ax25_protocol_release(AX25_P_NETROM);
|
|
unregister_netdevice_notifier(&nr_dev_notifier);
|
|
out_sock:
|
|
sock_unregister(PF_NETROM);
|
|
fail:
|
|
while (--i >= 0) {
|
|
unregister_netdev(dev_nr[i]);
|
|
free_netdev(dev_nr[i]);
|
|
}
|
|
kfree(dev_nr);
|
|
unregister_proto:
|
|
proto_unregister(&nr_proto);
|
|
return rc;
|
|
}
|
|
|
|
module_init(nr_proto_init);
|
|
|
|
module_param(nr_ndevs, int, 0);
|
|
MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
|
|
|
|
MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
|
|
MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_NETPROTO(PF_NETROM);
|
|
|
|
static void __exit nr_exit(void)
|
|
{
|
|
int i;
|
|
|
|
remove_proc_entry("nr", init_net.proc_net);
|
|
remove_proc_entry("nr_neigh", init_net.proc_net);
|
|
remove_proc_entry("nr_nodes", init_net.proc_net);
|
|
nr_loopback_clear();
|
|
|
|
nr_rt_free();
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
nr_unregister_sysctl();
|
|
#endif
|
|
|
|
ax25_linkfail_release(&nr_linkfail_notifier);
|
|
ax25_protocol_release(AX25_P_NETROM);
|
|
|
|
unregister_netdevice_notifier(&nr_dev_notifier);
|
|
|
|
sock_unregister(PF_NETROM);
|
|
|
|
for (i = 0; i < nr_ndevs; i++) {
|
|
struct net_device *dev = dev_nr[i];
|
|
if (dev) {
|
|
unregister_netdev(dev);
|
|
free_netdev(dev);
|
|
}
|
|
}
|
|
|
|
kfree(dev_nr);
|
|
proto_unregister(&nr_proto);
|
|
}
|
|
module_exit(nr_exit);
|