diff options
Diffstat (limited to 'net/netrom/nr_dev.c')
| -rw-r--r-- | net/netrom/nr_dev.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/net/netrom/nr_dev.c b/net/netrom/nr_dev.c new file mode 100644 index 000000000000..220bf7494f71 --- /dev/null +++ b/net/netrom/nr_dev.c @@ -0,0 +1,220 @@ +/* + * 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 Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) + */ +#include <linux/config.h> +#include <linux/module.h> +#include <linux/proc_fs.h> +#include <linux/kernel.h> +#include <linux/sched.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> /* For the statistics structure. */ + +#include <asm/system.h> +#include <asm/uaccess.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/netrom.h> + +#ifdef CONFIG_INET + +/* + * Only allow IP over NET/ROM frames through if the netrom device is up. + */ + +int nr_rx_ip(struct sk_buff *skb, struct net_device *dev) +{ + struct net_device_stats *stats = netdev_priv(dev); + + if (!netif_running(dev)) { + stats->rx_errors++; + return 0; + } + + stats->rx_packets++; + stats->rx_bytes += skb->len; + + skb->protocol = htons(ETH_P_IP); + + /* Spoof incoming device */ + skb->dev = dev; + skb->h.raw = skb->data; + skb->nh.raw = skb->data; + skb->pkt_type = PACKET_HOST; + + ip_rcv(skb, skb->dev, NULL); + + return 1; +} + + +static int nr_rebuild_header(struct sk_buff *skb) +{ + struct net_device *dev = skb->dev; + struct net_device_stats *stats = netdev_priv(dev); + struct sk_buff *skbn; + unsigned char *bp = skb->data; + int len; + + if (arp_find(bp + 7, skb)) { + return 1; + } + + bp[6] &= ~AX25_CBIT; + bp[6] &= ~AX25_EBIT; + bp[6] |= AX25_SSSID_SPARE; + bp += AX25_ADDR_LEN; + + bp[6] &= ~AX25_CBIT; + bp[6] |= AX25_EBIT; + bp[6] |= AX25_SSSID_SPARE; + + 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 (!nr_route_frame(skbn, NULL)) { + kfree_skb(skbn); + stats->tx_errors++; + } + + stats->tx_packets++; + stats->tx_bytes += len; + + return 1; +} + +#else + +static int nr_rebuild_header(struct sk_buff *skb) +{ + return 1; +} + +#endif + +static int nr_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, + void *daddr, void *saddr, unsigned len) +{ + unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN); + + memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len); + buff[6] &= ~AX25_CBIT; + buff[6] &= ~AX25_EBIT; + buff[6] |= AX25_SSSID_SPARE; + buff += AX25_ADDR_LEN; + + if (daddr != NULL) + memcpy(buff, daddr, dev->addr_len); + buff[6] &= ~AX25_CBIT; + buff[6] |= AX25_EBIT; + buff[6] |= AX25_SSSID_SPARE; + buff += AX25_ADDR_LEN; + + *buff++ = sysctl_netrom_network_ttl_initialiser; + + *buff++ = NR_PROTO_IP; + *buff++ = NR_PROTO_IP; + *buff++ = 0; + *buff++ = 0; + *buff++ = NR_PROTOEXT; + + if (daddr != NULL) + return 37; + + return -37; +} + +static int nr_set_mac_address(struct net_device *dev, void *addr) +{ + struct sockaddr *sa = addr; + + if (dev->flags & IFF_UP) + ax25_listen_release((ax25_address *)dev->dev_addr, NULL); + + memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); + + if (dev->flags & IFF_UP) + ax25_listen_register((ax25_address *)dev->dev_addr, NULL); + + return 0; +} + +static int nr_open(struct net_device *dev) +{ + netif_start_queue(dev); + ax25_listen_register((ax25_address *)dev->dev_addr, NULL); + return 0; +} + +static int nr_close(struct net_device *dev) +{ + ax25_listen_release((ax25_address *)dev->dev_addr, NULL); + netif_stop_queue(dev); + return 0; +} + +static int nr_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct net_device_stats *stats = netdev_priv(dev); + dev_kfree_skb(skb); + stats->tx_errors++; + return 0; +} + +static struct net_device_stats *nr_get_stats(struct net_device *dev) +{ + return netdev_priv(dev); +} + +void nr_setup(struct net_device *dev) +{ + SET_MODULE_OWNER(dev); + dev->mtu = NR_MAX_PACKET_SIZE; + dev->hard_start_xmit = nr_xmit; + dev->open = nr_open; + dev->stop = nr_close; + + dev->hard_header = nr_header; + dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN; + dev->addr_len = AX25_ADDR_LEN; + dev->type = ARPHRD_NETROM; + dev->tx_queue_len = 40; + dev->rebuild_header = nr_rebuild_header; + dev->set_mac_address = nr_set_mac_address; + + /* New-style flags. */ + dev->flags = 0; + + dev->get_stats = nr_get_stats; +} |