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;
+}