1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
4 | */ |
5 | |
6 | #include <linux/if_arp.h> |
7 | #include <linux/init.h> |
8 | #include <linux/netdevice.h> |
9 | #include <net_kern.h> |
10 | #include "slip.h" |
11 | |
12 | struct slip_init { |
13 | char *gate_addr; |
14 | }; |
15 | |
16 | static void slip_init(struct net_device *dev, void *data) |
17 | { |
18 | struct uml_net_private *private; |
19 | struct slip_data *spri; |
20 | struct slip_init *init = data; |
21 | |
22 | private = netdev_priv(dev); |
23 | spri = (struct slip_data *) private->user; |
24 | |
25 | memset(spri->name, 0, sizeof(spri->name)); |
26 | spri->addr = NULL; |
27 | spri->gate_addr = init->gate_addr; |
28 | spri->slave = -1; |
29 | spri->dev = dev; |
30 | |
31 | slip_proto_init(slip: &spri->slip); |
32 | |
33 | dev->hard_header_len = 0; |
34 | dev->header_ops = NULL; |
35 | dev->addr_len = 0; |
36 | dev->type = ARPHRD_SLIP; |
37 | dev->tx_queue_len = 256; |
38 | dev->flags = IFF_NOARP; |
39 | printk("SLIP backend - SLIP IP = %s\n" , spri->gate_addr); |
40 | } |
41 | |
42 | static unsigned short slip_protocol(struct sk_buff *skbuff) |
43 | { |
44 | return htons(ETH_P_IP); |
45 | } |
46 | |
47 | static int slip_read(int fd, struct sk_buff *skb, struct uml_net_private *lp) |
48 | { |
49 | return slip_user_read(fd, buf: skb_mac_header(skb), len: skb->dev->mtu, |
50 | pri: (struct slip_data *) &lp->user); |
51 | } |
52 | |
53 | static int slip_write(int fd, struct sk_buff *skb, struct uml_net_private *lp) |
54 | { |
55 | return slip_user_write(fd, buf: skb->data, len: skb->len, |
56 | pri: (struct slip_data *) &lp->user); |
57 | } |
58 | |
59 | static const struct net_kern_info slip_kern_info = { |
60 | .init = slip_init, |
61 | .protocol = slip_protocol, |
62 | .read = slip_read, |
63 | .write = slip_write, |
64 | }; |
65 | |
66 | static int slip_setup(char *str, char **mac_out, void *data) |
67 | { |
68 | struct slip_init *init = data; |
69 | |
70 | *init = ((struct slip_init) { .gate_addr = NULL }); |
71 | |
72 | if (str[0] != '\0') |
73 | init->gate_addr = str; |
74 | return 1; |
75 | } |
76 | |
77 | static struct transport slip_transport = { |
78 | .list = LIST_HEAD_INIT(slip_transport.list), |
79 | .name = "slip" , |
80 | .setup = slip_setup, |
81 | .user = &slip_user_info, |
82 | .kern = &slip_kern_info, |
83 | .private_size = sizeof(struct slip_data), |
84 | .setup_size = sizeof(struct slip_init), |
85 | }; |
86 | |
87 | static int register_slip(void) |
88 | { |
89 | register_transport(&slip_transport); |
90 | return 0; |
91 | } |
92 | |
93 | late_initcall(register_slip); |
94 | |