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/module.h> 10 #include <linux/proc_fs.h> 11 #include <linux/kernel.h> 12 #include <linux/sched.h> 13 #include <linux/interrupt.h> 14 #include <linux/fs.h> 15 #include <linux/types.h> 16 #include <linux/sysctl.h> 17 #include <linux/string.h> 18 #include <linux/socket.h> 19 #include <linux/errno.h> 20 #include <linux/fcntl.h> 21 #include <linux/in.h> 22 #include <linux/if_ether.h> 23 24 #include <asm/system.h> 25 #include <asm/io.h> 26 27 #include <linux/inet.h> 28 #include <linux/netdevice.h> 29 #include <linux/etherdevice.h> 30 #include <linux/if_arp.h> 31 #include <linux/skbuff.h> 32 33 #include <net/ip.h> 34 #include <net/arp.h> 35 36 #include <net/ax25.h> 37 #include <net/rose.h> 38 39 static int rose_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, 40 void *daddr, void *saddr, unsigned len) 41 { 42 unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2); 43 44 *buff++ = ROSE_GFI | ROSE_Q_BIT; 45 *buff++ = 0x00; 46 *buff++ = ROSE_DATA; 47 *buff++ = 0x7F; 48 *buff++ = AX25_P_IP; 49 50 if (daddr != NULL) 51 return 37; 52 53 return -37; 54 } 55 56 static int rose_rebuild_header(struct sk_buff *skb) 57 { 58 struct net_device *dev = skb->dev; 59 struct net_device_stats *stats = netdev_priv(dev); 60 unsigned char *bp = (unsigned char *)skb->data; 61 struct sk_buff *skbn; 62 unsigned int len; 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 len = skbn->len; 80 81 if (!rose_route_frame(skbn, NULL)) { 82 kfree_skb(skbn); 83 stats->tx_errors++; 84 return 1; 85 } 86 87 stats->tx_packets++; 88 stats->tx_bytes += len; 89 #endif 90 return 1; 91 } 92 93 static int rose_set_mac_address(struct net_device *dev, void *addr) 94 { 95 struct sockaddr *sa = addr; 96 97 rose_del_loopback_node((rose_address *)dev->dev_addr); 98 99 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); 100 101 rose_add_loopback_node((rose_address *)dev->dev_addr); 102 103 return 0; 104 } 105 106 static int rose_open(struct net_device *dev) 107 { 108 netif_start_queue(dev); 109 rose_add_loopback_node((rose_address *)dev->dev_addr); 110 return 0; 111 } 112 113 static int rose_close(struct net_device *dev) 114 { 115 netif_stop_queue(dev); 116 rose_del_loopback_node((rose_address *)dev->dev_addr); 117 return 0; 118 } 119 120 static int rose_xmit(struct sk_buff *skb, struct net_device *dev) 121 { 122 struct net_device_stats *stats = netdev_priv(dev); 123 124 if (!netif_running(dev)) { 125 printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n"); 126 return 1; 127 } 128 dev_kfree_skb(skb); 129 stats->tx_errors++; 130 return 0; 131 } 132 133 static struct net_device_stats *rose_get_stats(struct net_device *dev) 134 { 135 return netdev_priv(dev); 136 } 137 138 void rose_setup(struct net_device *dev) 139 { 140 dev->mtu = ROSE_MAX_PACKET_SIZE - 2; 141 dev->hard_start_xmit = rose_xmit; 142 dev->open = rose_open; 143 dev->stop = rose_close; 144 145 dev->hard_header = rose_header; 146 dev->hard_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN; 147 dev->addr_len = ROSE_ADDR_LEN; 148 dev->type = ARPHRD_ROSE; 149 dev->rebuild_header = rose_rebuild_header; 150 dev->set_mac_address = rose_set_mac_address; 151 152 /* New-style flags. */ 153 dev->flags = IFF_NOARP; 154 dev->get_stats = rose_get_stats; 155 } 156