| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify |
| 3 | * it under the terms of the GNU General Public License as published by |
| 4 | * the Free Software Foundation; either version 2 of the License, or |
| 5 | * (at your option) any later version. |
| 6 | * |
| 7 | * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) |
| 8 | */ |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/proc_fs.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/interrupt.h> |
| 13 | #include <linux/fs.h> |
| 14 | #include <linux/types.h> |
| 15 | #include <linux/sysctl.h> |
| 16 | #include <linux/string.h> |
| 17 | #include <linux/socket.h> |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/fcntl.h> |
| 20 | #include <linux/in.h> |
| 21 | #include <linux/if_ether.h> |
| 22 | #include <linux/slab.h> |
| 23 | |
| 24 | #include <asm/io.h> |
| 25 | |
| 26 | #include <linux/inet.h> |
| 27 | #include <linux/netdevice.h> |
| 28 | #include <linux/etherdevice.h> |
| 29 | #include <linux/if_arp.h> |
| 30 | #include <linux/skbuff.h> |
| 31 | |
| 32 | #include <net/ip.h> |
| 33 | #include <net/arp.h> |
| 34 | |
| 35 | #include <net/ax25.h> |
| 36 | #include <net/rose.h> |
| 37 | |
| 38 | static int rose_header(struct sk_buff *skb, struct net_device *dev, |
| 39 | unsigned short type, |
| 40 | const void *daddr, const void *saddr, unsigned int len) |
| 41 | { |
| 42 | unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2); |
| 43 | |
| 44 | if (daddr) |
| 45 | memcpy(buff + 7, daddr, dev->addr_len); |
| 46 | |
| 47 | *buff++ = ROSE_GFI | ROSE_Q_BIT; |
| 48 | *buff++ = 0x00; |
| 49 | *buff++ = ROSE_DATA; |
| 50 | *buff++ = 0x7F; |
| 51 | *buff++ = AX25_P_IP; |
| 52 | |
| 53 | if (daddr != NULL) |
| 54 | return 37; |
| 55 | |
| 56 | return -37; |
| 57 | } |
| 58 | |
| 59 | static int rose_set_mac_address(struct net_device *dev, void *addr) |
| 60 | { |
| 61 | struct sockaddr *sa = addr; |
| 62 | int err; |
| 63 | |
| 64 | if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len)) |
| 65 | return 0; |
| 66 | |
| 67 | if (dev->flags & IFF_UP) { |
| 68 | err = rose_add_loopback_node((rose_address *)sa->sa_data); |
| 69 | if (err) |
| 70 | return err; |
| 71 | |
| 72 | rose_del_loopback_node((rose_address *)dev->dev_addr); |
| 73 | } |
| 74 | |
| 75 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); |
| 76 | |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | static int rose_open(struct net_device *dev) |
| 81 | { |
| 82 | int err; |
| 83 | |
| 84 | err = rose_add_loopback_node((rose_address *)dev->dev_addr); |
| 85 | if (err) |
| 86 | return err; |
| 87 | |
| 88 | netif_start_queue(dev); |
| 89 | |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | static int rose_close(struct net_device *dev) |
| 94 | { |
| 95 | netif_stop_queue(dev); |
| 96 | rose_del_loopback_node((rose_address *)dev->dev_addr); |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | static netdev_tx_t rose_xmit(struct sk_buff *skb, struct net_device *dev) |
| 101 | { |
| 102 | struct net_device_stats *stats = &dev->stats; |
| 103 | unsigned int len = skb->len; |
| 104 | |
| 105 | if (!netif_running(dev)) { |
| 106 | printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n"); |
| 107 | return NETDEV_TX_BUSY; |
| 108 | } |
| 109 | |
| 110 | if (!rose_route_frame(skb, NULL)) { |
| 111 | dev_kfree_skb(skb); |
| 112 | stats->tx_errors++; |
| 113 | return NETDEV_TX_OK; |
| 114 | } |
| 115 | |
| 116 | stats->tx_packets++; |
| 117 | stats->tx_bytes += len; |
| 118 | return NETDEV_TX_OK; |
| 119 | } |
| 120 | |
| 121 | static const struct header_ops rose_header_ops = { |
| 122 | .create = rose_header, |
| 123 | }; |
| 124 | |
| 125 | static const struct net_device_ops rose_netdev_ops = { |
| 126 | .ndo_open = rose_open, |
| 127 | .ndo_stop = rose_close, |
| 128 | .ndo_start_xmit = rose_xmit, |
| 129 | .ndo_set_mac_address = rose_set_mac_address, |
| 130 | }; |
| 131 | |
| 132 | void rose_setup(struct net_device *dev) |
| 133 | { |
| 134 | dev->mtu = ROSE_MAX_PACKET_SIZE - 2; |
| 135 | dev->netdev_ops = &rose_netdev_ops; |
| 136 | |
| 137 | dev->header_ops = &rose_header_ops; |
| 138 | dev->hard_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN; |
| 139 | dev->addr_len = ROSE_ADDR_LEN; |
| 140 | dev->type = ARPHRD_ROSE; |
| 141 | |
| 142 | /* New-style flags. */ |
| 143 | dev->flags = IFF_NOARP; |
| 144 | } |