179 lines
3.7 KiB
C
179 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*
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* Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
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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((const ax25_address *)dev->dev_addr, NULL);
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}
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dev_addr_set(dev, sa->sa_data);
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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((const 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((const 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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