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 (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) 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/rose.h> 15 #include <linux/init.h> 16 17 static struct sk_buff_head loopback_queue; 18 static struct timer_list loopback_timer; 19 20 static void rose_set_loopback_timer(void); 21 22 void rose_loopback_init(void) 23 { 24 skb_queue_head_init(&loopback_queue); 25 26 init_timer(&loopback_timer); 27 } 28 29 static int rose_loopback_running(void) 30 { 31 return timer_pending(&loopback_timer); 32 } 33 34 int rose_loopback_queue(struct sk_buff *skb, struct rose_neigh *neigh) 35 { 36 struct sk_buff *skbn; 37 38 skbn = skb_clone(skb, GFP_ATOMIC); 39 40 kfree_skb(skb); 41 42 if (skbn != NULL) { 43 skb_queue_tail(&loopback_queue, skbn); 44 45 if (!rose_loopback_running()) 46 rose_set_loopback_timer(); 47 } 48 49 return 1; 50 } 51 52 static void rose_loopback_timer(unsigned long); 53 54 static void rose_set_loopback_timer(void) 55 { 56 del_timer(&loopback_timer); 57 58 loopback_timer.data = 0; 59 loopback_timer.function = &rose_loopback_timer; 60 loopback_timer.expires = jiffies + 10; 61 62 add_timer(&loopback_timer); 63 } 64 65 static void rose_loopback_timer(unsigned long param) 66 { 67 struct sk_buff *skb; 68 struct net_device *dev; 69 rose_address *dest; 70 struct sock *sk; 71 unsigned short frametype; 72 unsigned int lci_i, lci_o; 73 74 while ((skb = skb_dequeue(&loopback_queue)) != NULL) { 75 lci_i = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF); 76 frametype = skb->data[2]; 77 dest = (rose_address *)(skb->data + 4); 78 lci_o = 0xFFF - lci_i; 79 80 skb_reset_transport_header(skb); 81 82 sk = rose_find_socket(lci_o, rose_loopback_neigh); 83 if (sk) { 84 if (rose_process_rx_frame(sk, skb) == 0) 85 kfree_skb(skb); 86 continue; 87 } 88 89 if (frametype == ROSE_CALL_REQUEST) { 90 if ((dev = rose_dev_get(dest)) != NULL) { 91 if (rose_rx_call_request(skb, dev, rose_loopback_neigh, lci_o) == 0) 92 kfree_skb(skb); 93 } else { 94 kfree_skb(skb); 95 } 96 } else { 97 kfree_skb(skb); 98 } 99 } 100 } 101 102 void __exit rose_loopback_clear(void) 103 { 104 struct sk_buff *skb; 105 106 del_timer(&loopback_timer); 107 108 while ((skb = skb_dequeue(&loopback_queue)) != NULL) { 109 skb->sk = NULL; 110 kfree_skb(skb); 111 } 112 } 113