Linux-2.6.12-rc2
[linux-2.6.git] / arch / um / drivers / slirp_kern.c
1 #include "linux/kernel.h"
2 #include "linux/stddef.h"
3 #include "linux/init.h"
4 #include "linux/netdevice.h"
5 #include "linux/if_arp.h"
6 #include "net_kern.h"
7 #include "net_user.h"
8 #include "kern.h"
9 #include "slirp.h"
10
11 struct slirp_init {
12         struct arg_list_dummy_wrapper argw;  /* XXX should be simpler... */
13 };
14
15 void slirp_init(struct net_device *dev, void *data)
16 {
17         struct uml_net_private *private;
18         struct slirp_data *spri;
19         struct slirp_init *init = data;
20         int i;
21
22         private = dev->priv;
23         spri = (struct slirp_data *) private->user;
24         *spri = ((struct slirp_data)
25                 { .argw         = init->argw,
26                   .pid          = -1,
27                   .slave        = -1,
28                   .ibuf         = { '\0' },
29                   .obuf         = { '\0' },
30                   .pos          = 0,
31                   .esc          = 0,
32                   .dev          = dev });
33
34         dev->init = NULL;
35         dev->hard_header_len = 0;
36         dev->header_cache_update = NULL;
37         dev->hard_header_cache = NULL;
38         dev->hard_header = NULL;
39         dev->addr_len = 0;
40         dev->type = ARPHRD_SLIP;
41         dev->tx_queue_len = 256;
42         dev->flags = IFF_NOARP;
43         printk("SLIRP backend - command line:");
44         for(i=0;spri->argw.argv[i]!=NULL;i++) {
45                 printk(" '%s'",spri->argw.argv[i]);
46         }
47         printk("\n");
48 }
49
50 static unsigned short slirp_protocol(struct sk_buff *skbuff)
51 {
52         return(htons(ETH_P_IP));
53 }
54
55 static int slirp_read(int fd, struct sk_buff **skb, 
56                        struct uml_net_private *lp)
57 {
58         return(slirp_user_read(fd, (*skb)->mac.raw, (*skb)->dev->mtu, 
59                               (struct slirp_data *) &lp->user));
60 }
61
62 static int slirp_write(int fd, struct sk_buff **skb,
63                       struct uml_net_private *lp)
64 {
65         return(slirp_user_write(fd, (*skb)->data, (*skb)->len, 
66                                (struct slirp_data *) &lp->user));
67 }
68
69 struct net_kern_info slirp_kern_info = {
70         .init                   = slirp_init,
71         .protocol               = slirp_protocol,
72         .read                   = slirp_read,
73         .write                  = slirp_write,
74 };
75
76 static int slirp_setup(char *str, char **mac_out, void *data)
77 {
78         struct slirp_init *init = data;
79         int i=0;
80
81         *init = ((struct slirp_init)
82                 { argw :                { { "slirp", NULL  } } });
83
84         str = split_if_spec(str, mac_out, NULL);
85
86         if(str == NULL) { /* no command line given after MAC addr */
87                 return(1);
88         }
89
90         do {
91                 if(i>=SLIRP_MAX_ARGS-1) {
92                         printk("slirp_setup: truncating slirp arguments\n");
93                         break;
94                 }
95                 init->argw.argv[i++] = str;
96                 while(*str && *str!=',') {
97                         if(*str=='_') *str=' ';
98                         str++;
99                 }
100                 if(*str!=',')
101                         break;
102                 *str++='\0';
103         } while(1);
104         init->argw.argv[i]=NULL;
105         return(1);
106 }
107
108 static struct transport slirp_transport = {
109         .list           = LIST_HEAD_INIT(slirp_transport.list),
110         .name           = "slirp",
111         .setup          = slirp_setup,
112         .user           = &slirp_user_info,
113         .kern           = &slirp_kern_info,
114         .private_size   = sizeof(struct slirp_data),
115         .setup_size     = sizeof(struct slirp_init),
116 };
117
118 static int register_slirp(void)
119 {
120         register_transport(&slirp_transport);
121         return(1);
122 }
123
124 __initcall(register_slirp);
125
126 /*
127  * Overrides for Emacs so that we follow Linus's tabbing style.
128  * Emacs will notice this stuff at the end of the file and automatically
129  * adjust the settings for this buffer only.  This must remain at the end
130  * of the file.
131  * ---------------------------------------------------------------------------
132  * Local variables:
133  * c-file-style: "linux"
134  * End:
135  */