Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * |
4 | * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) | |
5 | */ | |
1da177e4 LT |
6 | #include <linux/module.h> |
7 | #include <linux/proc_fs.h> | |
8 | #include <linux/kernel.h> | |
1da177e4 LT |
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> /* For the statistics structure. */ | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
dc8e5416 | 20 | #include <linux/uaccess.h> |
1da177e4 | 21 | |
1da177e4 LT |
22 | #include <asm/io.h> |
23 | ||
24 | #include <linux/inet.h> | |
25 | #include <linux/netdevice.h> | |
26 | #include <linux/etherdevice.h> | |
27 | #include <linux/if_arp.h> | |
28 | #include <linux/skbuff.h> | |
29 | ||
30 | #include <net/ip.h> | |
31 | #include <net/arp.h> | |
32 | ||
33 | #include <net/ax25.h> | |
34 | #include <net/netrom.h> | |
35 | ||
1da177e4 LT |
36 | /* |
37 | * Only allow IP over NET/ROM frames through if the netrom device is up. | |
38 | */ | |
39 | ||
40 | int nr_rx_ip(struct sk_buff *skb, struct net_device *dev) | |
41 | { | |
b51414b6 | 42 | struct net_device_stats *stats = &dev->stats; |
1da177e4 LT |
43 | |
44 | if (!netif_running(dev)) { | |
6ddcf626 | 45 | stats->rx_dropped++; |
1da177e4 LT |
46 | return 0; |
47 | } | |
48 | ||
49 | stats->rx_packets++; | |
50 | stats->rx_bytes += skb->len; | |
51 | ||
52 | skb->protocol = htons(ETH_P_IP); | |
53 | ||
54 | /* Spoof incoming device */ | |
55 | skb->dev = dev; | |
c6e6ca71 | 56 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 57 | skb_reset_network_header(skb); |
1da177e4 LT |
58 | skb->pkt_type = PACKET_HOST; |
59 | ||
98a82feb | 60 | netif_rx(skb); |
1da177e4 LT |
61 | |
62 | return 1; | |
63 | } | |
64 | ||
3b04ddde SH |
65 | static int nr_header(struct sk_buff *skb, struct net_device *dev, |
66 | unsigned short type, | |
95c96174 | 67 | const void *daddr, const void *saddr, unsigned int len) |
1da177e4 LT |
68 | { |
69 | unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN); | |
70 | ||
71 | memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len); | |
72 | buff[6] &= ~AX25_CBIT; | |
73 | buff[6] &= ~AX25_EBIT; | |
74 | buff[6] |= AX25_SSSID_SPARE; | |
75 | buff += AX25_ADDR_LEN; | |
76 | ||
77 | if (daddr != NULL) | |
78 | memcpy(buff, daddr, dev->addr_len); | |
79 | buff[6] &= ~AX25_CBIT; | |
80 | buff[6] |= AX25_EBIT; | |
81 | buff[6] |= AX25_SSSID_SPARE; | |
82 | buff += AX25_ADDR_LEN; | |
83 | ||
84 | *buff++ = sysctl_netrom_network_ttl_initialiser; | |
85 | ||
86 | *buff++ = NR_PROTO_IP; | |
87 | *buff++ = NR_PROTO_IP; | |
88 | *buff++ = 0; | |
89 | *buff++ = 0; | |
90 | *buff++ = NR_PROTOEXT; | |
91 | ||
92 | if (daddr != NULL) | |
93 | return 37; | |
94 | ||
95 | return -37; | |
96 | } | |
97 | ||
81dcd169 | 98 | static int __must_check nr_set_mac_address(struct net_device *dev, void *addr) |
1da177e4 LT |
99 | { |
100 | struct sockaddr *sa = addr; | |
81dcd169 RB |
101 | int err; |
102 | ||
103 | if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len)) | |
104 | return 0; | |
105 | ||
106 | if (dev->flags & IFF_UP) { | |
107 | err = ax25_listen_register((ax25_address *)sa->sa_data, NULL); | |
108 | if (err) | |
109 | return err; | |
1da177e4 | 110 | |
1da177e4 | 111 | ax25_listen_release((ax25_address *)dev->dev_addr, NULL); |
81dcd169 | 112 | } |
1da177e4 LT |
113 | |
114 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
115 | ||
1da177e4 LT |
116 | return 0; |
117 | } | |
118 | ||
119 | static int nr_open(struct net_device *dev) | |
120 | { | |
81dcd169 RB |
121 | int err; |
122 | ||
123 | err = ax25_listen_register((ax25_address *)dev->dev_addr, NULL); | |
124 | if (err) | |
125 | return err; | |
126 | ||
1da177e4 | 127 | netif_start_queue(dev); |
81dcd169 | 128 | |
1da177e4 LT |
129 | return 0; |
130 | } | |
131 | ||
132 | static int nr_close(struct net_device *dev) | |
133 | { | |
134 | ax25_listen_release((ax25_address *)dev->dev_addr, NULL); | |
135 | netif_stop_queue(dev); | |
136 | return 0; | |
137 | } | |
138 | ||
36e4d64a | 139 | static netdev_tx_t nr_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 140 | { |
b51414b6 | 141 | struct net_device_stats *stats = &dev->stats; |
b88a762b | 142 | unsigned int len = skb->len; |
3f2aadd0 RB |
143 | |
144 | if (!nr_route_frame(skb, NULL)) { | |
145 | kfree_skb(skb); | |
146 | stats->tx_errors++; | |
6ed10654 | 147 | return NETDEV_TX_OK; |
3f2aadd0 RB |
148 | } |
149 | ||
150 | stats->tx_packets++; | |
151 | stats->tx_bytes += len; | |
152 | ||
6ed10654 | 153 | return NETDEV_TX_OK; |
1da177e4 LT |
154 | } |
155 | ||
3b04ddde SH |
156 | static const struct header_ops nr_header_ops = { |
157 | .create = nr_header, | |
3b04ddde SH |
158 | }; |
159 | ||
0f6c5c8e SH |
160 | static const struct net_device_ops nr_netdev_ops = { |
161 | .ndo_open = nr_open, | |
162 | .ndo_stop = nr_close, | |
163 | .ndo_start_xmit = nr_xmit, | |
164 | .ndo_set_mac_address = nr_set_mac_address, | |
165 | }; | |
3b04ddde | 166 | |
1da177e4 LT |
167 | void nr_setup(struct net_device *dev) |
168 | { | |
1da177e4 | 169 | dev->mtu = NR_MAX_PACKET_SIZE; |
0f6c5c8e | 170 | dev->netdev_ops = &nr_netdev_ops; |
3b04ddde | 171 | dev->header_ops = &nr_header_ops; |
1da177e4 LT |
172 | dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN; |
173 | dev->addr_len = AX25_ADDR_LEN; | |
174 | dev->type = ARPHRD_NETROM; | |
1da177e4 LT |
175 | |
176 | /* New-style flags. */ | |
72377291 | 177 | dev->flags = IFF_NOARP; |
1da177e4 | 178 | } |