| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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->h.raw = skb->data; |
| 81 | |
| 82 | if ((sk = rose_find_socket(lci_o, rose_loopback_neigh)) != NULL) { |
| 83 | if (rose_process_rx_frame(sk, skb) == 0) |
| 84 | kfree_skb(skb); |
| 85 | continue; |
| 86 | } |
| 87 | |
| 88 | if (frametype == ROSE_CALL_REQUEST) { |
| 89 | if ((dev = rose_dev_get(dest)) != NULL) { |
| 90 | if (rose_rx_call_request(skb, dev, rose_loopback_neigh, lci_o) == 0) |
| 91 | kfree_skb(skb); |
| 92 | } else { |
| 93 | kfree_skb(skb); |
| 94 | } |
| 95 | } else { |
| 96 | kfree_skb(skb); |
| 97 | } |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | void __exit rose_loopback_clear(void) |
| 102 | { |
| 103 | struct sk_buff *skb; |
| 104 | |
| 105 | del_timer(&loopback_timer); |
| 106 | |
| 107 | while ((skb = skb_dequeue(&loopback_queue)) != NULL) { |
| 108 | skb->sk = NULL; |
| 109 | kfree_skb(skb); |
| 110 | } |
| 111 | } |