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178 lines
3.7 KiB
178 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* |
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* Copyright Jonathan Naylor G4KLX ([email protected]) |
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*/ |
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#include <linux/module.h> |
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#include <linux/proc_fs.h> |
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#include <linux/kernel.h> |
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#include <linux/interrupt.h> |
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#include <linux/fs.h> |
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#include <linux/types.h> |
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#include <linux/sysctl.h> |
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#include <linux/string.h> |
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#include <linux/socket.h> |
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#include <linux/errno.h> |
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#include <linux/fcntl.h> |
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#include <linux/in.h> |
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#include <linux/if_ether.h> /* For the statistics structure. */ |
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#include <linux/slab.h> |
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#include <linux/uaccess.h> |
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#include <asm/io.h> |
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#include <linux/inet.h> |
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#include <linux/netdevice.h> |
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#include <linux/etherdevice.h> |
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#include <linux/if_arp.h> |
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#include <linux/skbuff.h> |
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#include <net/ip.h> |
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#include <net/arp.h> |
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#include <net/ax25.h> |
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#include <net/netrom.h> |
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/* |
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* Only allow IP over NET/ROM frames through if the netrom device is up. |
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*/ |
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int nr_rx_ip(struct sk_buff *skb, struct net_device *dev) |
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{ |
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struct net_device_stats *stats = &dev->stats; |
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if (!netif_running(dev)) { |
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stats->rx_dropped++; |
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return 0; |
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} |
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stats->rx_packets++; |
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stats->rx_bytes += skb->len; |
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skb->protocol = htons(ETH_P_IP); |
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/* Spoof incoming device */ |
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skb->dev = dev; |
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skb->mac_header = skb->network_header; |
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skb_reset_network_header(skb); |
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skb->pkt_type = PACKET_HOST; |
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netif_rx(skb); |
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return 1; |
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} |
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static int nr_header(struct sk_buff *skb, struct net_device *dev, |
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unsigned short type, |
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const void *daddr, const void *saddr, unsigned int len) |
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{ |
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unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN); |
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memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len); |
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buff[6] &= ~AX25_CBIT; |
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buff[6] &= ~AX25_EBIT; |
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buff[6] |= AX25_SSSID_SPARE; |
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buff += AX25_ADDR_LEN; |
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if (daddr != NULL) |
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memcpy(buff, daddr, dev->addr_len); |
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buff[6] &= ~AX25_CBIT; |
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buff[6] |= AX25_EBIT; |
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buff[6] |= AX25_SSSID_SPARE; |
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buff += AX25_ADDR_LEN; |
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*buff++ = sysctl_netrom_network_ttl_initialiser; |
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*buff++ = NR_PROTO_IP; |
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*buff++ = NR_PROTO_IP; |
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*buff++ = 0; |
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*buff++ = 0; |
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*buff++ = NR_PROTOEXT; |
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if (daddr != NULL) |
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return 37; |
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return -37; |
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} |
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static int __must_check nr_set_mac_address(struct net_device *dev, void *addr) |
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{ |
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struct sockaddr *sa = addr; |
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int err; |
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if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len)) |
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return 0; |
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if (dev->flags & IFF_UP) { |
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err = ax25_listen_register((ax25_address *)sa->sa_data, NULL); |
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if (err) |
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return err; |
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ax25_listen_release((ax25_address *)dev->dev_addr, NULL); |
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} |
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memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); |
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return 0; |
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} |
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static int nr_open(struct net_device *dev) |
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{ |
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int err; |
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err = ax25_listen_register((ax25_address *)dev->dev_addr, NULL); |
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if (err) |
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return err; |
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netif_start_queue(dev); |
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return 0; |
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} |
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static int nr_close(struct net_device *dev) |
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{ |
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ax25_listen_release((ax25_address *)dev->dev_addr, NULL); |
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netif_stop_queue(dev); |
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return 0; |
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} |
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static netdev_tx_t nr_xmit(struct sk_buff *skb, struct net_device *dev) |
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{ |
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struct net_device_stats *stats = &dev->stats; |
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unsigned int len = skb->len; |
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if (!nr_route_frame(skb, NULL)) { |
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kfree_skb(skb); |
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stats->tx_errors++; |
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return NETDEV_TX_OK; |
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} |
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stats->tx_packets++; |
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stats->tx_bytes += len; |
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return NETDEV_TX_OK; |
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} |
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static const struct header_ops nr_header_ops = { |
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.create = nr_header, |
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}; |
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static const struct net_device_ops nr_netdev_ops = { |
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.ndo_open = nr_open, |
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.ndo_stop = nr_close, |
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.ndo_start_xmit = nr_xmit, |
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.ndo_set_mac_address = nr_set_mac_address, |
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}; |
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void nr_setup(struct net_device *dev) |
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{ |
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dev->mtu = NR_MAX_PACKET_SIZE; |
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dev->netdev_ops = &nr_netdev_ops; |
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dev->header_ops = &nr_header_ops; |
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dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN; |
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dev->addr_len = AX25_ADDR_LEN; |
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dev->type = ARPHRD_NETROM; |
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/* New-style flags. */ |
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dev->flags = IFF_NOARP; |
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}
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