nr_dev.rar_If only

#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> /* For the statistics structure. */ #include <linux/slab.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> /* * 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 = &dev->stats; if (!netif_running(dev)) { stats->rx_dropped++; return 0; } stats->rx_packets++; stats->rx_bytes += skb->len; skb->protocol = htons(ETH_P_IP); /* Spoof incoming device */ skb->dev = dev; skb->mac_header = skb->network_header; skb_reset_network_header(skb); skb->pkt_type = PACKET_HOST; netif_rx(skb); return 1; } #ifdef CONFIG_INET static int nr_rebuild_header(struct sk_buff *skb) { unsigned char *bp = skb->data; 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; return 0; } #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, const void *daddr, const void *saddr, unsigned int 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 __must_check nr_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 = ax25_listen_register((ax25_address *)sa->sa_data, NULL); if (err) return err; ax25_listen_release((ax25_address *)dev->dev_addr, NULL); } memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); return 0; } static int nr_open(struct net_device *dev) { int err; err = ax25_listen_register((ax25_address *)dev->dev_addr, NULL); if (err) return err; netif_start_queue(dev); 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 netdev_tx_t nr_xmit(struct sk_buff *skb, struct net_device *dev) { struct net_device_stats *stats = &dev->stats; unsigned int len = skb->len; if (!nr_route_frame(skb, NULL)) { kfree_skb(skb); stats->tx_errors++; return NETDEV_TX_OK; } stats->tx_packets++; stats->tx_bytes += len; return NETDEV_TX_OK; } static const struct header_ops nr_header_ops = { .create = nr_header, .rebuild= nr_rebuild_header, }; static const struct net_device_ops nr_netdev_ops = { .ndo_open = nr_open, .ndo_stop = nr_close, .ndo_start_xmit = nr_xmit, .ndo_set_mac_address = nr_set_mac_address, }; void nr_setup(struct net_device *dev) { dev->mtu = NR_MAX_PACKET_SIZE; dev->netdev_ops = &nr_netdev_ops; dev->header_ops = &nr_header_ops; dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN; dev->addr_len = AX25_ADDR_LEN; dev->type = ARPHRD_NETROM; /* New-style flags. */ dev->flags = IFF_NOARP; }