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/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, 39 unsigned short type, 40 const void *daddr, const void *saddr, unsigned int 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 #ifdef CONFIG_INET 59 struct net_device *dev = skb->dev; 60 struct net_device_stats *stats = &dev->stats; 61 unsigned char *bp = (unsigned char *)skb->data; 62 struct sk_buff *skbn; 63 unsigned int len; 64 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 int err; 97 98 if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len)) 99 return 0; 100 101 if (dev->flags & IFF_UP) { 102 err = rose_add_loopback_node((rose_address *)sa->sa_data); 103 if (err) 104 return err; 105 106 rose_del_loopback_node((rose_address *)dev->dev_addr); 107 } 108 109 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); 110 111 return 0; 112 } 113 114 static int rose_open(struct net_device *dev) 115 { 116 int err; 117 118 err = rose_add_loopback_node((rose_address *)dev->dev_addr); 119 if (err) 120 return err; 121 122 netif_start_queue(dev); 123 124 return 0; 125 } 126 127 static int rose_close(struct net_device *dev) 128 { 129 netif_stop_queue(dev); 130 rose_del_loopback_node((rose_address *)dev->dev_addr); 131 return 0; 132 } 133 134 static netdev_tx_t rose_xmit(struct sk_buff *skb, struct net_device *dev) 135 { 136 struct net_device_stats *stats = &dev->stats; 137 138 if (!netif_running(dev)) { 139 printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n"); 140 return NETDEV_TX_BUSY; 141 } 142 dev_kfree_skb(skb); 143 stats->tx_errors++; 144 return NETDEV_TX_OK; 145 } 146 147 static const struct header_ops rose_header_ops = { 148 .create = rose_header, 149 .rebuild = rose_rebuild_header, 150 }; 151 152 static const struct net_device_ops rose_netdev_ops = { 153 .ndo_open = rose_open, 154 .ndo_stop = rose_close, 155 .ndo_start_xmit = rose_xmit, 156 .ndo_set_mac_address = rose_set_mac_address, 157 }; 158 159 void rose_setup(struct net_device *dev) 160 { 161 dev->mtu = ROSE_MAX_PACKET_SIZE - 2; 162 dev->netdev_ops = &rose_netdev_ops; 163 164 dev->header_ops = &rose_header_ops; 165 dev->hard_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN; 166 dev->addr_len = ROSE_ADDR_LEN; 167 dev->type = ARPHRD_ROSE; 168 169 /* New-style flags. */ 170 dev->flags = IFF_NOARP; 171 } 172