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Linux/net/rose/rose_dev.c

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  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 
 35 static 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 
 56 static 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 
 77 static 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 
 90 static 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 
 97 static 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 
118 static const struct header_ops rose_header_ops = {
119         .create = rose_header,
120 };
121 
122 static 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 
129 void 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 

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