Merge branch 'splice' of git://brick.kernel.dk/data/git/linux-2.6-block
[linux-2.6] / arch / um / drivers / daemon_kern.c
1 /*
2  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and 
3  * James Leu (jleu@mindspring.net).
4  * Copyright (C) 2001 by various other people who didn't put their name here.
5  * Licensed under the GPL.
6  */
7
8 #include "linux/kernel.h"
9 #include "linux/init.h"
10 #include "linux/netdevice.h"
11 #include "linux/etherdevice.h"
12 #include "net_kern.h"
13 #include "net_user.h"
14 #include "daemon.h"
15
16 struct daemon_init {
17         char *sock_type;
18         char *ctl_sock;
19 };
20
21 static void daemon_init(struct net_device *dev, void *data)
22 {
23         struct uml_net_private *pri;
24         struct daemon_data *dpri;
25         struct daemon_init *init = data;
26
27         pri = dev->priv;
28         dpri = (struct daemon_data *) pri->user;
29         dpri->sock_type = init->sock_type;
30         dpri->ctl_sock = init->ctl_sock;
31         dpri->fd = -1;
32         dpri->control = -1;
33         dpri->dev = dev;
34         /* We will free this pointer. If it contains crap we're burned. */
35         dpri->ctl_addr = NULL;
36         dpri->data_addr = NULL;
37         dpri->local_addr = NULL;
38
39         printk("daemon backend (uml_switch version %d) - %s:%s", 
40                SWITCH_VERSION, dpri->sock_type, dpri->ctl_sock);
41         printk("\n");
42 }
43
44 static int daemon_read(int fd, struct sk_buff **skb, 
45                        struct uml_net_private *lp)
46 {
47         *skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
48         if(*skb == NULL) return(-ENOMEM);
49         return(net_recvfrom(fd, (*skb)->mac.raw, 
50                             (*skb)->dev->mtu + ETH_HEADER_OTHER));
51 }
52
53 static int daemon_write(int fd, struct sk_buff **skb,
54                         struct uml_net_private *lp)
55 {
56         return(daemon_user_write(fd, (*skb)->data, (*skb)->len, 
57                                  (struct daemon_data *) &lp->user));
58 }
59
60 static struct net_kern_info daemon_kern_info = {
61         .init                   = daemon_init,
62         .protocol               = eth_protocol,
63         .read                   = daemon_read,
64         .write                  = daemon_write,
65 };
66
67 static int daemon_setup(char *str, char **mac_out, void *data)
68 {
69         struct daemon_init *init = data;
70         char *remain;
71
72         *init = ((struct daemon_init)
73                 { .sock_type            = "unix",
74                   .ctl_sock             = "/tmp/uml.ctl" });
75         
76         remain = split_if_spec(str, mac_out, &init->sock_type, &init->ctl_sock,
77                                NULL);
78         if(remain != NULL)
79                 printk(KERN_WARNING "daemon_setup : Ignoring data socket "
80                        "specification\n");
81         
82         return(1);
83 }
84
85 static struct transport daemon_transport = {
86         .list           = LIST_HEAD_INIT(daemon_transport.list),
87         .name           = "daemon",
88         .setup          = daemon_setup,
89         .user           = &daemon_user_info,
90         .kern           = &daemon_kern_info,
91         .private_size   = sizeof(struct daemon_data),
92         .setup_size     = sizeof(struct daemon_init),
93 };
94
95 static int register_daemon(void)
96 {
97         register_transport(&daemon_transport);
98         return 0;
99 }
100
101 __initcall(register_daemon);