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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * |
4 | * Copyright Tomi Manninen OH2BNS (oh2bns@sral.fi) | |
5 | */ | |
6 | #include <linux/types.h> | |
5a0e3ad6 | 7 | #include <linux/slab.h> |
1da177e4 LT |
8 | #include <linux/socket.h> |
9 | #include <linux/timer.h> | |
10 | #include <net/ax25.h> | |
11 | #include <linux/skbuff.h> | |
12 | #include <net/netrom.h> | |
13 | #include <linux/init.h> | |
14 | ||
24ed960a | 15 | static void nr_loopback_timer(struct timer_list *); |
1da177e4 LT |
16 | |
17 | static struct sk_buff_head loopback_queue; | |
1d27e3e2 | 18 | static DEFINE_TIMER(loopback_timer, nr_loopback_timer); |
1da177e4 LT |
19 | |
20 | void __init nr_loopback_init(void) | |
21 | { | |
22 | skb_queue_head_init(&loopback_queue); | |
23 | } | |
24 | ||
25 | static inline int nr_loopback_running(void) | |
26 | { | |
27 | return timer_pending(&loopback_timer); | |
28 | } | |
29 | ||
30 | int nr_loopback_queue(struct sk_buff *skb) | |
31 | { | |
32 | struct sk_buff *skbn; | |
33 | ||
34 | if ((skbn = alloc_skb(skb->len, GFP_ATOMIC)) != NULL) { | |
d626f62b | 35 | skb_copy_from_linear_data(skb, skb_put(skbn, skb->len), skb->len); |
badff6d0 | 36 | skb_reset_transport_header(skbn); |
1da177e4 LT |
37 | |
38 | skb_queue_tail(&loopback_queue, skbn); | |
39 | ||
40 | if (!nr_loopback_running()) | |
41 | mod_timer(&loopback_timer, jiffies + 10); | |
42 | } | |
43 | ||
44 | kfree_skb(skb); | |
45 | return 1; | |
46 | } | |
47 | ||
24ed960a | 48 | static void nr_loopback_timer(struct timer_list *unused) |
1da177e4 LT |
49 | { |
50 | struct sk_buff *skb; | |
51 | ax25_address *nr_dest; | |
52 | struct net_device *dev; | |
53 | ||
54 | if ((skb = skb_dequeue(&loopback_queue)) != NULL) { | |
55 | nr_dest = (ax25_address *)(skb->data + 7); | |
56 | ||
57 | dev = nr_dev_get(nr_dest); | |
58 | ||
59 | if (dev == NULL || nr_rx_frame(skb, dev) == 0) | |
60 | kfree_skb(skb); | |
61 | ||
1160dfa1 | 62 | dev_put(dev); |
1da177e4 LT |
63 | |
64 | if (!skb_queue_empty(&loopback_queue) && !nr_loopback_running()) | |
65 | mod_timer(&loopback_timer, jiffies + 10); | |
66 | } | |
67 | } | |
68 | ||
d3706566 | 69 | void nr_loopback_clear(void) |
1da177e4 LT |
70 | { |
71 | del_timer_sync(&loopback_timer); | |
72 | skb_queue_purge(&loopback_queue); | |
73 | } |