LXR linux/net/rose/rose

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *
   4 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
   5 */
   6#include <linux/module.h>
   7#include <linux/proc_fs.h>
   8#include <linux/kernel.h>
   9#include <linux/interrupt.h>
  10#include <linux/fs.h>
  11#include <linux/types.h>
  12#include <linux/sysctl.h>
  13#include <linux/string.h>
  14#include <linux/socket.h>
  15#include <linux/errno.h>
  16#include <linux/fcntl.h>
  17#include <linux/in.h>
  18#include <linux/if_ether.h>
  19#include <linux/slab.h>
  20
  21#include <asm/io.h>
  22
  23#include <linux/inet.h>
  24#include <linux/netdevice.h>
  25#include <linux/etherdevice.h>
  26#include <linux/if_arp.h>
  27#include <linux/skbuff.h>
  28
  29#include <net/ip.h>
  30#include <net/arp.h>
  31
  32#include <net/ax25.h>
  33#include <net/rose.h>
  34
  35static int rose_header(struct sk_buff *skb, struct net_device *dev,
  36                       unsigned short type,
  37                       const void *daddr, const void *saddr, unsigned int len)
  38{
  39        unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2);
  40
  41        if (daddr)
  42                memcpy(buff + 7, daddr, dev->addr_len);
  43
  44        *buff++ = ROSE_GFI | ROSE_Q_BIT;
  45        *buff++ = 0x00;
  46        *buff++ = ROSE_DATA;
  47        *buff++ = 0x7F;
  48        *buff++ = AX25_P_IP;
  49
  50        if (daddr != NULL)
  51                return 37;
  52
  53        return -37;
  54}
  55
  56static int rose_set_mac_address(struct net_device *dev, void *addr)
  57{
  58        struct sockaddr *sa = addr;
  59        int err;
  60
  61        if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
  62                return 0;
  63
  64        if (dev->flags & IFF_UP) {
  65                err = rose_add_loopback_node((rose_address *)sa->sa_data);
  66                if (err)
  67                        return err;
  68
  69                rose_del_loopback_node((rose_address *)dev->dev_addr);
  70        }
  71
  72        memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
  73
  74        return 0;
  75}
  76
  77static int rose_open(struct net_device *dev)
  78{
  79        int err;
  80
  81        err = rose_add_loopback_node((rose_address *)dev->dev_addr);
  82        if (err)
  83                return err;
  84
  85        netif_start_queue(dev);
  86
  87        return 0;
  88}
  89
  90static int rose_close(struct net_device *dev)
  91{
  92        netif_stop_queue(dev);
  93        rose_del_loopback_node((rose_address *)dev->dev_addr);
  94        return 0;
  95}
  96
  97static netdev_tx_t rose_xmit(struct sk_buff *skb, struct net_device *dev)
  98{
  99        struct net_device_stats *stats = &dev->stats;
 100        unsigned int len = skb->len;
 101
 102        if (!netif_running(dev)) {
 103                printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n");
 104                return NETDEV_TX_BUSY;
 105        }
 106
 107        if (!rose_route_frame(skb, NULL)) {
 108                dev_kfree_skb(skb);
 109                stats->tx_errors++;
 110                return NETDEV_TX_OK;
 111        }
 112
 113        stats->tx_packets++;
 114        stats->tx_bytes += len;
 115        return NETDEV_TX_OK;
 116}
 117
 118static const struct header_ops rose_header_ops = {
 119        .create = rose_header,
 120};
 121
 122static const struct net_device_ops rose_netdev_ops = {
 123        .ndo_open               = rose_open,
 124        .ndo_stop               = rose_close,
 125        .ndo_start_xmit         = rose_xmit,
 126        .ndo_set_mac_address    = rose_set_mac_address,
 127};
 128
 129void rose_setup(struct net_device *dev)
 130{
 131        dev->mtu                = ROSE_MAX_PACKET_SIZE - 2;
 132        dev->netdev_ops         = &rose_netdev_ops;
 133
 134        dev->header_ops         = &rose_header_ops;
 135        dev->hard_header_len    = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
 136        dev->addr_len           = ROSE_ADDR_LEN;
 137        dev->type               = ARPHRD_ROSE;
 138
 139        /* New-style flags. */
 140        dev->flags              = IFF_NOARP;
 141}
 142