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 #include <linux/slab.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, 40 unsigned short type, 41 const void *daddr, const 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 #ifdef CONFIG_INET 60 struct net_device *dev = skb->dev; 61 struct net_device_stats *stats = &dev->stats; 62 unsigned char *bp = (unsigned char *)skb->data; 63 struct sk_buff *skbn; 64 unsigned int len; 65 66 if (arp_find(bp + 7, skb)) { 67 return 1; 68 } 69 70 if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) { 71 kfree_skb(skb); 72 return 1; 73 } 74 75 if (skb->sk != NULL) 76 skb_set_owner_w(skbn, skb->sk); 77 78 kfree_skb(skb); 79 80 len = skbn->len; 81 82 if (!rose_route_frame(skbn, NULL)) { 83 kfree_skb(skbn); 84 stats->tx_errors++; 85 return 1; 86 } 87 88 stats->tx_packets++; 89 stats->tx_bytes += len; 90 #endif 91 return 1; 92 } 93 94 static int rose_set_mac_address(struct net_device *dev, void *addr) 95 { 96 struct sockaddr *sa = addr; 97 int err; 98 99 if (!memcpy(dev->dev_addr, sa->sa_data, dev->addr_len)) 100 return 0; 101 102 if (dev->flags & IFF_UP) { 103 err = rose_add_loopback_node((rose_address *)dev->dev_addr); 104 if (err) 105 return err; 106 107 rose_del_loopback_node((rose_address *)dev->dev_addr); 108 } 109 110 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); 111 112 return 0; 113 } 114 115 static int rose_open(struct net_device *dev) 116 { 117 int err; 118 119 err = rose_add_loopback_node((rose_address *)dev->dev_addr); 120 if (err) 121 return err; 122 123 netif_start_queue(dev); 124 125 return 0; 126 } 127 128 static int rose_close(struct net_device *dev) 129 { 130 netif_stop_queue(dev); 131 rose_del_loopback_node((rose_address *)dev->dev_addr); 132 return 0; 133 } 134 135 static netdev_tx_t rose_xmit(struct sk_buff *skb, struct net_device *dev) 136 { 137 struct net_device_stats *stats = &dev->stats; 138 139 if (!netif_running(dev)) { 140 printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n"); 141 return NETDEV_TX_BUSY; 142 } 143 dev_kfree_skb(skb); 144 stats->tx_errors++; 145 return NETDEV_TX_OK; 146 } 147 148 static const struct header_ops rose_header_ops = { 149 .create = rose_header, 150 .rebuild= rose_rebuild_header, 151 }; 152 153 static const struct net_device_ops rose_netdev_ops = { 154 .ndo_open = rose_open, 155 .ndo_stop = rose_close, 156 .ndo_start_xmit = rose_xmit, 157 .ndo_set_mac_address = rose_set_mac_address, 158 }; 159 160 void rose_setup(struct net_device *dev) 161 { 162 dev->mtu = ROSE_MAX_PACKET_SIZE - 2; 163 dev->netdev_ops = &rose_netdev_ops; 164 165 dev->header_ops = &rose_header_ops; 166 dev->hard_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN; 167 dev->addr_len = ROSE_ADDR_LEN; 168 dev->type = ARPHRD_ROSE; 169 170 /* New-style flags. */ 171 dev->flags = IFF_NOARP; 172 } 173