1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License as published by 4 * the Free Software Foundation; either version 2 of the License, or 5 * (at your option) any later version. 6 * 7 * Copyright Tomi Manninen OH2BNS (oh2bns@sral.fi) 8 */ 9 #include <linux/types.h> 10 #include <linux/socket.h> 11 #include <linux/timer.h> 12 #include <net/ax25.h> 13 #include <linux/skbuff.h> 14 #include <net/netrom.h> 15 #include <linux/init.h> 16 17 static void nr_loopback_timer(unsigned long); 18 19 static struct sk_buff_head loopback_queue; 20 static DEFINE_TIMER(loopback_timer, nr_loopback_timer, 0, 0); 21 22 void __init nr_loopback_init(void) 23 { 24 skb_queue_head_init(&loopback_queue); 25 } 26 27 static inline int nr_loopback_running(void) 28 { 29 return timer_pending(&loopback_timer); 30 } 31 32 int nr_loopback_queue(struct sk_buff *skb) 33 { 34 struct sk_buff *skbn; 35 36 if ((skbn = alloc_skb(skb->len, GFP_ATOMIC)) != NULL) { 37 skb_copy_from_linear_data(skb, skb_put(skbn, skb->len), skb->len); 38 skb_reset_transport_header(skbn); 39 40 skb_queue_tail(&loopback_queue, skbn); 41 42 if (!nr_loopback_running()) 43 mod_timer(&loopback_timer, jiffies + 10); 44 } 45 46 kfree_skb(skb); 47 return 1; 48 } 49 50 static void nr_loopback_timer(unsigned long param) 51 { 52 struct sk_buff *skb; 53 ax25_address *nr_dest; 54 struct net_device *dev; 55 56 if ((skb = skb_dequeue(&loopback_queue)) != NULL) { 57 nr_dest = (ax25_address *)(skb->data + 7); 58 59 dev = nr_dev_get(nr_dest); 60 61 if (dev == NULL || nr_rx_frame(skb, dev) == 0) 62 kfree_skb(skb); 63 64 if (dev != NULL) 65 dev_put(dev); 66 67 if (!skb_queue_empty(&loopback_queue) && !nr_loopback_running()) 68 mod_timer(&loopback_timer, jiffies + 10); 69 } 70 } 71 72 void __exit nr_loopback_clear(void) 73 { 74 del_timer_sync(&loopback_timer); 75 skb_queue_purge(&loopback_queue); 76 } 77