/* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) */ #include <linux/module.h> #include <linux/proc_fs.h> #include <linux/kernel.h> #include <linux/interrupt.h> #include <linux/fs.h> #include <linux/types.h> #include <linux/sysctl.h> #include <linux/string.h> #include <linux/socket.h> #include <linux/errno.h> #include <linux/fcntl.h> #include <linux/in.h> #include <linux/if_ether.h> #include <asm/system.h> #include <asm/io.h> #include <linux/inet.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/if_arp.h> #include <linux/skbuff.h> #include <net/ip.h> #include <net/arp.h> #include <net/ax25.h> #include <net/rose.h> static int rose_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, const void *daddr, const void *saddr, unsigned len) { unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2); *buff++ = ROSE_GFI | ROSE_Q_BIT; *buff++ = 0x00; *buff++ = ROSE_DATA; *buff++ = 0x7F; *buff++ = AX25_P_IP; if (daddr != NULL) return 37; return -37; } static int rose_rebuild_header(struct sk_buff *skb) { #ifdef CONFIG_INET struct net_device *dev = skb->dev; struct net_device_stats *stats = &dev->stats; unsigned char *bp = (unsigned char *)skb->data; struct sk_buff *skbn; unsigned int len; if (arp_find(bp + 7, skb)) { return 1; } if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) { kfree_skb(skb); return 1; } if (skb->sk != NULL) skb_set_owner_w(skbn, skb->sk); kfree_skb(skb); len = skbn->len; if (!rose_route_frame(skbn, NULL)) { kfree_skb(skbn); stats->tx_errors++; return 1; } stats->tx_packets++; stats->tx_bytes += len; #endif return 1; } static int rose_set_mac_address(struct net_device *dev, void *addr) { struct sockaddr *sa = addr; int err; if (!memcpy(dev->dev_addr, sa->sa_data, dev->addr_len)) return 0; if (dev->flags & IFF_UP) { err = rose_add_loopback_node((rose_address *)dev->dev_addr); if (err) return err; rose_del_loopback_node((rose_address *)dev->dev_addr); } memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); return 0; } static int rose_open(struct net_device *dev) { int err; err = rose_add_loopback_node((rose_address *)dev->dev_addr); if (err) return err; netif_start_queue(dev); return 0; } static int rose_close(struct net_device *dev) { netif_stop_queue(dev); rose_del_loopback_node((rose_address *)dev->dev_addr); return 0; } static int rose_xmit(struct sk_buff *skb, struct net_device *dev) { struct net_device_stats *stats = &dev->stats; if (!netif_running(dev)) { printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n"); return NETDEV_TX_BUSY; } dev_kfree_skb(skb); stats->tx_errors++; return NETDEV_TX_OK; } static const struct header_ops rose_header_ops = { .create = rose_header, .rebuild= rose_rebuild_header, }; static const struct net_device_ops rose_netdev_ops = { .ndo_open = rose_open, .ndo_stop = rose_close, .ndo_start_xmit = rose_xmit, .ndo_set_mac_address = rose_set_mac_address, }; void rose_setup(struct net_device *dev) { dev->mtu = ROSE_MAX_PACKET_SIZE - 2; dev->netdev_ops = &rose_netdev_ops; dev->header_ops = &rose_header_ops; dev->hard_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN; dev->addr_len = ROSE_ADDR_LEN; dev->type = ARPHRD_ROSE; /* New-style flags. */ dev->flags = IFF_NOARP; }