diff options
Diffstat (limited to 'net/netrom/nr_dev.c')
| -rw-r--r-- | net/netrom/nr_dev.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/net/netrom/nr_dev.c b/net/netrom/nr_dev.c new file mode 100644 index 000000000..29e418c8c --- /dev/null +++ b/net/netrom/nr_dev.c @@ -0,0 +1,178 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * + * Copyright 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> /* For the statistics structure. */ +#include <linux/slab.h> +#include <linux/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; +} + +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, +}; + +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; +} |