1 /* 2 * NET/ROM release 007 3 * 4 * This code REQUIRES 2.1.15 or higher/ NET3.038 5 * 6 * This module: 7 * This module is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 * 12 * History 13 * NET/ROM 007 Tomi(OH2BNS) Created this file. 14 * Small change in nr_loopback_queue(). 15 * 16 */ 17 18 #include <linux/types.h> 19 #include <linux/socket.h> 20 #include <linux/timer.h> 21 #include <net/ax25.h> 22 #include <linux/skbuff.h> 23 #include <net/netrom.h> 24 #include <linux/init.h> 25 26 static struct sk_buff_head loopback_queue; 27 static struct timer_list loopback_timer; 28 29 static void nr_set_loopback_timer(void); 30 nr_loopback_init(void)31void nr_loopback_init(void) 32 { 33 skb_queue_head_init(&loopback_queue); 34 35 init_timer(&loopback_timer); 36 } 37 nr_loopback_running(void)38static int nr_loopback_running(void) 39 { 40 return timer_pending(&loopback_timer); 41 } 42 nr_loopback_queue(struct sk_buff * skb)43int nr_loopback_queue(struct sk_buff *skb) 44 { 45 struct sk_buff *skbn; 46 47 if ((skbn = alloc_skb(skb->len, GFP_ATOMIC)) != NULL) { 48 memcpy(skb_put(skbn, skb->len), skb->data, skb->len); 49 skbn->h.raw = skbn->data; 50 51 skb_queue_tail(&loopback_queue, skbn); 52 53 if (!nr_loopback_running()) 54 nr_set_loopback_timer(); 55 } 56 57 kfree_skb(skb); 58 return 1; 59 } 60 61 static void nr_loopback_timer(unsigned long); 62 nr_set_loopback_timer(void)63static void nr_set_loopback_timer(void) 64 { 65 del_timer(&loopback_timer); 66 67 loopback_timer.data = 0; 68 loopback_timer.function = &nr_loopback_timer; 69 loopback_timer.expires = jiffies + 10; 70 71 add_timer(&loopback_timer); 72 } 73 nr_loopback_timer(unsigned long param)74static void nr_loopback_timer(unsigned long param) 75 { 76 struct sk_buff *skb; 77 ax25_address *nr_dest; 78 struct net_device *dev; 79 80 if ((skb = skb_dequeue(&loopback_queue)) != NULL) { 81 nr_dest = (ax25_address *)(skb->data + 7); 82 83 dev = nr_dev_get(nr_dest); 84 85 if (dev == NULL || nr_rx_frame(skb, dev) == 0) 86 kfree_skb(skb); 87 88 if (dev != NULL) 89 dev_put(dev); 90 91 if (!skb_queue_empty(&loopback_queue) && !nr_loopback_running()) 92 nr_set_loopback_timer(); 93 } 94 } 95 nr_loopback_clear(void)96void __exit nr_loopback_clear(void) 97 { 98 del_timer(&loopback_timer); 99 skb_queue_purge(&loopback_queue); 100 } 101