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/interrupt.h> 13 #include <linux/fs.h> 14 #include <linux/types.h> 15 #include <linux/sysctl.h> 16 #include <linux/string.h> 17 #include <linux/socket.h> 18 #include <linux/errno.h> 19 #include <linux/fcntl.h> 20 #include <linux/in.h> 21 #include <linux/if_ether.h> 22 23 #include <asm/system.h> 24 #include <asm/io.h> 25 26 #include <linux/inet.h> 27 #include <linux/netdevice.h> 28 #include <linux/etherdevice.h> 29 #include <linux/if_arp.h> 30 #include <linux/skbuff.h> 31 32 #include <net/ip.h> 33 #include <net/arp.h> 34 35 #include <net/ax25.h> 36 #include <net/rose.h> 37 38 static int rose_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, 39 void *daddr, void *saddr, unsigned len) 40 { 41 unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2); 42 43 *buff++ = ROSE_GFI | ROSE_Q_BIT; 44 *buff++ = 0x00; 45 *buff++ = ROSE_DATA; 46 *buff++ = 0x7F; 47 *buff++ = AX25_P_IP; 48 49 if (daddr != NULL) 50 return 37; 51 52 return -37; 53 } 54 55 static int rose_rebuild_header(struct sk_buff *skb) 56 { 57 struct net_device *dev = skb->dev; 58 struct net_device_stats *stats = netdev_priv(dev); 59 unsigned char *bp = (unsigned char *)skb->data; 60 struct sk_buff *skbn; 61 unsigned int len; 62 63 #ifdef CONFIG_INET 64 if (arp_find(bp + 7, skb)) { 65 return 1; 66 } 67 68 if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) { 69 kfree_skb(skb); 70 return 1; 71 } 72 73 if (skb->sk != NULL) 74 skb_set_owner_w(skbn, skb->sk); 75 76 kfree_skb(skb); 77 78 len = skbn->len; 79 80 if (!rose_route_frame(skbn, NULL)) { 81 kfree_skb(skbn); 82 stats->tx_errors++; 83 return 1; 84 } 85 86 stats->tx_packets++; 87 stats->tx_bytes += len; 88 #endif 89 return 1; 90 } 91 92 static int rose_set_mac_address(struct net_device *dev, void *addr) 93 { 94 struct sockaddr *sa = addr; 95 int err; 96 97 if (!memcpy(dev->dev_addr, sa->sa_data, dev->addr_len)) 98 return 0; 99 100 if (dev->flags & IFF_UP) { 101 err = rose_add_loopback_node((rose_address *)dev->dev_addr); 102 if (err) 103 return err; 104 105 rose_del_loopback_node((rose_address *)dev->dev_addr); 106 } 107 108 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); 109 110 return 0; 111 } 112 113 static int rose_open(struct net_device *dev) 114 { 115 int err; 116 117 err = rose_add_loopback_node((rose_address *)dev->dev_addr); 118 if (err) 119 return err; 120 121 netif_start_queue(dev); 122 123 return 0; 124 } 125 126 static int rose_close(struct net_device *dev) 127 { 128 netif_stop_queue(dev); 129 rose_del_loopback_node((rose_address *)dev->dev_addr); 130 return 0; 131 } 132 133 static int rose_xmit(struct sk_buff *skb, struct net_device *dev) 134 { 135 struct net_device_stats *stats = netdev_priv(dev); 136 137 if (!netif_running(dev)) { 138 printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n"); 139 return 1; 140 } 141 dev_kfree_skb(skb); 142 stats->tx_errors++; 143 return 0; 144 } 145 146 static struct net_device_stats *rose_get_stats(struct net_device *dev) 147 { 148 return netdev_priv(dev); 149 } 150 151 void rose_setup(struct net_device *dev) 152 { 153 dev->mtu = ROSE_MAX_PACKET_SIZE - 2; 154 dev->hard_start_xmit = rose_xmit; 155 dev->open = rose_open; 156 dev->stop = rose_close; 157 158 dev->hard_header = rose_header; 159 dev->hard_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN; 160 dev->addr_len = ROSE_ADDR_LEN; 161 dev->type = ARPHRD_ROSE; 162 dev->rebuild_header = rose_rebuild_header; 163 dev->set_mac_address = rose_set_mac_address; 164 165 /* New-style flags. */ 166 dev->flags = IFF_NOARP; 167 dev->get_stats = rose_get_stats; 168 } 169