Merge branch 'mv-merge'
[linux-2.6] / arch / um / drivers / mcast_user.c
1 /*
2  * user-mode-linux networking multicast transport
3  * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
4  *
5  * based on the existing uml-networking code, which is
6  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and 
7  * James Leu (jleu@mindspring.net).
8  * Copyright (C) 2001 by various other people who didn't put their name here.
9  *
10  * Licensed under the GPL.
11  *
12  */
13
14 #include <errno.h>
15 #include <unistd.h>
16 #include <sys/socket.h>
17 #include <sys/un.h>
18 #include <sys/time.h>
19 #include <netinet/in.h>
20 #include "net_user.h"
21 #include "mcast.h"
22 #include "kern_util.h"
23 #include "user_util.h"
24 #include "user.h"
25 #include "os.h"
26
27 #define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
28
29 static struct sockaddr_in *new_addr(char *addr, unsigned short port)
30 {
31         struct sockaddr_in *sin;
32
33         sin = um_kmalloc(sizeof(struct sockaddr_in));
34         if(sin == NULL){
35                 printk("new_addr: allocation of sockaddr_in failed\n");
36                 return(NULL);
37         }
38         sin->sin_family = AF_INET;
39         sin->sin_addr.s_addr = in_aton(addr);
40         sin->sin_port = htons(port);
41         return(sin);
42 }
43
44 static void mcast_user_init(void *data, void *dev)
45 {
46         struct mcast_data *pri = data;
47
48         pri->mcast_addr = new_addr(pri->addr, pri->port);
49         pri->dev = dev;
50 }
51
52 static int mcast_open(void *data)
53 {
54         struct mcast_data *pri = data;
55         struct sockaddr_in *sin = pri->mcast_addr;
56         struct ip_mreq mreq;
57         int fd, yes = 1, err = -EINVAL;
58
59
60         if ((sin->sin_addr.s_addr == 0) || (sin->sin_port == 0))
61                 goto out;
62
63         fd = socket(AF_INET, SOCK_DGRAM, 0);
64
65         if (fd < 0){
66                 err = -errno;
67                 printk("mcast_open : data socket failed, errno = %d\n", 
68                        errno);
69                 goto out;
70         }
71
72         if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
73                 err = -errno;
74                 printk("mcast_open: SO_REUSEADDR failed, errno = %d\n",
75                         errno);
76                 goto out_close;
77         }
78
79         /* set ttl according to config */
80         if (setsockopt(fd, SOL_IP, IP_MULTICAST_TTL, &pri->ttl,
81                        sizeof(pri->ttl)) < 0) {
82                 err = -errno;
83                 printk("mcast_open: IP_MULTICAST_TTL failed, error = %d\n",
84                         errno);
85                 goto out_close;
86         }
87
88         /* set LOOP, so data does get fed back to local sockets */
89         if (setsockopt(fd, SOL_IP, IP_MULTICAST_LOOP, &yes, sizeof(yes)) < 0) {
90                 err = -errno;
91                 printk("mcast_open: IP_MULTICAST_LOOP failed, error = %d\n",
92                         errno);
93                 goto out_close;
94         }
95
96         /* bind socket to mcast address */
97         if (bind(fd, (struct sockaddr *) sin, sizeof(*sin)) < 0) {
98                 err = -errno;
99                 printk("mcast_open : data bind failed, errno = %d\n", errno);
100                 goto out_close;
101         }               
102         
103         /* subscribe to the multicast group */
104         mreq.imr_multiaddr.s_addr = sin->sin_addr.s_addr;
105         mreq.imr_interface.s_addr = 0;
106         if (setsockopt(fd, SOL_IP, IP_ADD_MEMBERSHIP, 
107                        &mreq, sizeof(mreq)) < 0) {
108                 err = -errno;
109                 printk("mcast_open: IP_ADD_MEMBERSHIP failed, error = %d\n",
110                         errno);
111                 printk("There appears not to be a multicast-capable network "
112                        "interface on the host.\n");
113                 printk("eth0 should be configured in order to use the "
114                        "multicast transport.\n");
115                 goto out_close;
116         }
117
118         return fd;
119
120  out_close:
121         os_close_file(fd);
122  out:
123         return err;
124 }
125
126 static void mcast_close(int fd, void *data)
127 {
128         struct ip_mreq mreq;
129         struct mcast_data *pri = data;
130         struct sockaddr_in *sin = pri->mcast_addr;
131
132         mreq.imr_multiaddr.s_addr = sin->sin_addr.s_addr;
133         mreq.imr_interface.s_addr = 0;
134         if (setsockopt(fd, SOL_IP, IP_DROP_MEMBERSHIP,
135                        &mreq, sizeof(mreq)) < 0) {
136                 printk("mcast_open: IP_DROP_MEMBERSHIP failed, error = %d\n",
137                         errno);
138         }
139
140         os_close_file(fd);
141 }
142
143 int mcast_user_write(int fd, void *buf, int len, struct mcast_data *pri)
144 {
145         struct sockaddr_in *data_addr = pri->mcast_addr;
146
147         return(net_sendto(fd, buf, len, data_addr, sizeof(*data_addr)));
148 }
149
150 static int mcast_set_mtu(int mtu, void *data)
151 {
152         return(mtu);
153 }
154
155 struct net_user_info mcast_user_info = {
156         .init           = mcast_user_init,
157         .open           = mcast_open,
158         .close          = mcast_close,
159         .remove         = NULL,
160         .set_mtu        = mcast_set_mtu,
161         .add_address    = NULL,
162         .delete_address = NULL,
163         .max_packet     = MAX_PACKET - ETH_HEADER_OTHER
164 };