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gerrit.nordix.org / codeaurora / cp-linux / c9398ad8a107f96d44e8a7ef3a09f788ed53c119 / . / net / netrom / nr_dev.c
blob: 988f542481a835c394549666d5244be8b48e9faa [file] [log] [blame]
Kyle Swenson8d8f6542021-03-15 11:02:55 -0600[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 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> /* For the statistics structure. */
22#include <linux/slab.h>
23#include <linux/uaccess.h>
24
25#include <asm/io.h>
26
27#include <linux/inet.h>
28#include <linux/netdevice.h>
29#include <linux/etherdevice.h>
30#include <linux/if_arp.h>
31#include <linux/skbuff.h>
32
33#include <net/ip.h>
34#include <net/arp.h>
35
36#include <net/ax25.h>
37#include <net/netrom.h>
38
39/*
40 * Only allow IP over NET/ROM frames through if the netrom device is up.
41 */
42
43int nr_rx_ip(struct sk_buff *skb, struct net_device *dev)
44{
45 struct net_device_stats *stats = &dev->stats;
46
47 if (!netif_running(dev)) {
48 stats->rx_dropped++;
49 return 0;
50 }
51
52 stats->rx_packets++;
53 stats->rx_bytes += skb->len;
54
55 skb->protocol = htons(ETH_P_IP);
56
57 /* Spoof incoming device */
58 skb->dev = dev;
59 skb->mac_header = skb->network_header;
60 skb_reset_network_header(skb);
61 skb->pkt_type = PACKET_HOST;
62
63 netif_rx(skb);
64
65 return 1;
66}
67
68static int nr_header(struct sk_buff *skb, struct net_device *dev,
69 unsigned short type,
70 const void *daddr, const void *saddr, unsigned int len)
71{
72 unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
73
74 memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len);
75 buff[6] &= ~AX25_CBIT;
76 buff[6] &= ~AX25_EBIT;
77 buff[6] |= AX25_SSSID_SPARE;
78 buff += AX25_ADDR_LEN;
79
80 if (daddr != NULL)
81 memcpy(buff, daddr, dev->addr_len);
82 buff[6] &= ~AX25_CBIT;
83 buff[6] |= AX25_EBIT;
84 buff[6] |= AX25_SSSID_SPARE;
85 buff += AX25_ADDR_LEN;
86
87 *buff++ = sysctl_netrom_network_ttl_initialiser;
88
89 *buff++ = NR_PROTO_IP;
90 *buff++ = NR_PROTO_IP;
91 *buff++ = 0;
92 *buff++ = 0;
93 *buff++ = NR_PROTOEXT;
94
95 if (daddr != NULL)
96 return 37;
97
98 return -37;
99}
100
101static int __must_check nr_set_mac_address(struct net_device *dev, void *addr)
102{
103 struct sockaddr *sa = addr;
104 int err;
105
106 if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
107 return 0;
108
109 if (dev->flags & IFF_UP) {
110 err = ax25_listen_register((ax25_address *)sa->sa_data, NULL);
111 if (err)
112 return err;
113
114 ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
115 }
116
117 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
118
119 return 0;
120}
121
122static int nr_open(struct net_device *dev)
123{
124 int err;
125
126 err = ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
127 if (err)
128 return err;
129
130 netif_start_queue(dev);
131
132 return 0;
133}
134
135static int nr_close(struct net_device *dev)
136{
137 ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
138 netif_stop_queue(dev);
139 return 0;
140}
141
142static netdev_tx_t nr_xmit(struct sk_buff *skb, struct net_device *dev)
143{
144 struct net_device_stats *stats = &dev->stats;
145 unsigned int len = skb->len;
146
147 if (!nr_route_frame(skb, NULL)) {
148 kfree_skb(skb);
149 stats->tx_errors++;
150 return NETDEV_TX_OK;
151 }
152
153 stats->tx_packets++;
154 stats->tx_bytes += len;
155
156 return NETDEV_TX_OK;
157}
158
159static const struct header_ops nr_header_ops = {
160 .create = nr_header,
161};
162
163static const struct net_device_ops nr_netdev_ops = {
164 .ndo_open = nr_open,
165 .ndo_stop = nr_close,
166 .ndo_start_xmit = nr_xmit,
167 .ndo_set_mac_address = nr_set_mac_address,
168};
169
170void nr_setup(struct net_device *dev)
171{
172 dev->mtu = NR_MAX_PACKET_SIZE;
173 dev->netdev_ops = &nr_netdev_ops;
174 dev->header_ops = &nr_header_ops;
175 dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
176 dev->addr_len = AX25_ADDR_LEN;
177 dev->type = ARPHRD_NETROM;
178
179 /* New-style flags. */
180 dev->flags = IFF_NOARP;
181}