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
rose_header(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned int len)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
rose_set_mac_address(struct net_device * dev,void * addr)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((const rose_address *)dev->dev_addr);
70 }
71
72 dev_addr_set(dev, sa->sa_data);
73
74 return 0;
75 }
76
rose_open(struct net_device * dev)77 static int rose_open(struct net_device *dev)
78 {
79 int err;
80
81 err = rose_add_loopback_node((const rose_address *)dev->dev_addr);
82 if (err)
83 return err;
84
85 netif_start_queue(dev);
86
87 return 0;
88 }
89
rose_close(struct net_device * dev)90 static int rose_close(struct net_device *dev)
91 {
92 netif_stop_queue(dev);
93 rose_del_loopback_node((const rose_address *)dev->dev_addr);
94 return 0;
95 }
96
rose_xmit(struct sk_buff * skb,struct net_device * dev)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
rose_setup(struct net_device * dev)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