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 (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(p: dev->dev_addr, q: sa->sa_data, size: 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, addr: sa->sa_data); |
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((const 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((const 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 = { |
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 | |