diff options
Diffstat (limited to 'net/rose/rose_dev.c')
| -rw-r--r-- | net/rose/rose_dev.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/net/rose/rose_dev.c b/net/rose/rose_dev.c new file mode 100644 index 00000000..906cc05b --- /dev/null +++ b/net/rose/rose_dev.c @@ -0,0 +1,171 @@ +/* + * 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 <linux/slab.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 (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len)) + return 0; + + if (dev->flags & IFF_UP) { + err = rose_add_loopback_node((rose_address *)sa->sa_data); + 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 netdev_tx_t 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; +} |