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/slab.h> 11 #include <linux/socket.h> 12 #include <linux/timer.h> 13 #include <net/ax25.h> 14 #include <linux/skbuff.h> 15 #include <net/rose.h> 16 #include <linux/init.h> 17 18 static struct sk_buff_head loopback_queue; 19 static struct timer_list loopback_timer; 20 21 static void rose_set_loopback_timer(void); 22 static void rose_loopback_timer(struct timer_list *unused); 23 24 void rose_loopback_init(void) 25 { 26 skb_queue_head_init(&loopback_queue); 27 28 timer_setup(&loopback_timer, rose_loopback_timer, 0); 29 } 30 31 static int rose_loopback_running(void) 32 { 33 return timer_pending(&loopback_timer); 34 } 35 36 int rose_loopback_queue(struct sk_buff *skb, struct rose_neigh *neigh) 37 { 38 struct sk_buff *skbn; 39 40 skbn = skb_clone(skb, GFP_ATOMIC); 41 42 kfree_skb(skb); 43 44 if (skbn != NULL) { 45 skb_queue_tail(&loopback_queue, skbn); 46 47 if (!rose_loopback_running()) 48 rose_set_loopback_timer(); 49 } 50 51 return 1; 52 } 53 54 55 static void rose_set_loopback_timer(void) 56 { 57 del_timer(&loopback_timer); 58 59 loopback_timer.expires = jiffies + 10; 60 add_timer(&loopback_timer); 61 } 62 63 static void rose_loopback_timer(struct timer_list *unused) 64 { 65 struct sk_buff *skb; 66 struct net_device *dev; 67 rose_address *dest; 68 struct sock *sk; 69 unsigned short frametype; 70 unsigned int lci_i, lci_o; 71 72 while ((skb = skb_dequeue(&loopback_queue)) != NULL) { 73 if (skb->len < ROSE_MIN_LEN) { 74 kfree_skb(skb); 75 continue; 76 } 77 lci_i = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF); 78 frametype = skb->data[2]; 79 if (frametype == ROSE_CALL_REQUEST && 80 (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF || 81 skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] != 82 ROSE_CALL_REQ_ADDR_LEN_VAL)) { 83 kfree_skb(skb); 84 continue; 85 } 86 dest = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF); 87 lci_o = ROSE_DEFAULT_MAXVC + 1 - lci_i; 88 89 skb_reset_transport_header(skb); 90 91 sk = rose_find_socket(lci_o, rose_loopback_neigh); 92 if (sk) { 93 if (rose_process_rx_frame(sk, skb) == 0) 94 kfree_skb(skb); 95 continue; 96 } 97 98 if (frametype == ROSE_CALL_REQUEST) { 99 if ((dev = rose_dev_get(dest)) != NULL) { 100 if (rose_rx_call_request(skb, dev, rose_loopback_neigh, lci_o) == 0) 101 kfree_skb(skb); 102 } else { 103 kfree_skb(skb); 104 } 105 } else { 106 kfree_skb(skb); 107 } 108 } 109 } 110 111 void __exit rose_loopback_clear(void) 112 { 113 struct sk_buff *skb; 114 115 del_timer(&loopback_timer); 116 117 while ((skb = skb_dequeue(&loopback_queue)) != NULL) { 118 skb->sk = NULL; 119 kfree_skb(skb); 120 } 121 } 122