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/config.h> 10 #include <linux/module.h> 11 #include <linux/proc_fs.h> 12 #include <linux/kernel.h> 13 #include <linux/sched.h> 14 #include <linux/interrupt.h> 15 #include <linux/fs.h> 16 #include <linux/types.h> 17 #include <linux/sysctl.h> 18 #include <linux/string.h> 19 #include <linux/socket.h> 20 #include <linux/errno.h> 21 #include <linux/fcntl.h> 22 #include <linux/in.h> 23 #include <linux/if_ether.h> 24 25 #include <asm/system.h> 26 #include <asm/io.h> 27 28 #include <linux/inet.h> 29 #include <linux/netdevice.h> 30 #include <linux/etherdevice.h> 31 #include <linux/if_arp.h> 32 #include <linux/skbuff.h> 33 34 #include <net/ip.h> 35 #include <net/arp.h> 36 37 #include <net/ax25.h> 38 #include <net/rose.h> 39 40 static int rose_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, 41 void *daddr, void *saddr, unsigned len) 42 { 43 unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2); 44 45 *buff++ = ROSE_GFI | ROSE_Q_BIT; 46 *buff++ = 0x00; 47 *buff++ = ROSE_DATA; 48 *buff++ = 0x7F; 49 *buff++ = AX25_P_IP; 50 51 if (daddr != NULL) 52 return 37; 53 54 return -37; 55 } 56 57 static int rose_rebuild_header(struct sk_buff *skb) 58 { 59 struct net_device *dev = skb->dev; 60 struct net_device_stats *stats = netdev_priv(dev); 61 unsigned char *bp = (unsigned char *)skb->data; 62 struct sk_buff *skbn; 63 64 #ifdef CONFIG_INET 65 if (arp_find(bp + 7, skb)) { 66 return 1; 67 } 68 69 if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) { 70 kfree_skb(skb); 71 return 1; 72 } 73 74 if (skb->sk != NULL) 75 skb_set_owner_w(skbn, skb->sk); 76 77 kfree_skb(skb); 78 79 if (!rose_route_frame(skbn, NULL)) { 80 kfree_skb(skbn); 81 stats->tx_errors++; 82 return 1; 83 } 84 85 stats->tx_packets++; 86 stats->tx_bytes += skbn->len; 87 #endif 88 return 1; 89 } 90 91 static int rose_set_mac_address(struct net_device *dev, void *addr) 92 { 93 struct sockaddr *sa = addr; 94 95 rose_del_loopback_node((rose_address *)dev->dev_addr); 96 97 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); 98 99 rose_add_loopback_node((rose_address *)dev->dev_addr); 100 101 return 0; 102 } 103 104 static int rose_open(struct net_device *dev) 105 { 106 netif_start_queue(dev); 107 rose_add_loopback_node((rose_address *)dev->dev_addr); 108 return 0; 109 } 110 111 static int rose_close(struct net_device *dev) 112 { 113 netif_stop_queue(dev); 114 rose_del_loopback_node((rose_address *)dev->dev_addr); 115 return 0; 116 } 117 118 static int rose_xmit(struct sk_buff *skb, struct net_device *dev) 119 { 120 struct net_device_stats *stats = netdev_priv(dev); 121 122 if (!netif_running(dev)) { 123 printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n"); 124 return 1; 125 } 126 dev_kfree_skb(skb); 127 stats->tx_errors++; 128 return 0; 129 } 130 131 static struct net_device_stats *rose_get_stats(struct net_device *dev) 132 { 133 return netdev_priv(dev); 134 } 135 136 void rose_setup(struct net_device *dev) 137 { 138 SET_MODULE_OWNER(dev); 139 dev->mtu = ROSE_MAX_PACKET_SIZE - 2; 140 dev->hard_start_xmit = rose_xmit; 141 dev->open = rose_open; 142 dev->stop = rose_close; 143 144 dev->hard_header = rose_header; 145 dev->hard_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN; 146 dev->addr_len = ROSE_ADDR_LEN; 147 dev->type = ARPHRD_ROSE; 148 dev->rebuild_header = rose_rebuild_header; 149 dev->set_mac_address = rose_set_mac_address; 150 151 /* New-style flags. */ 152 dev->flags = 0; 153 dev->get_stats = rose_get_stats; 154 } 155