Automatic merge of /spare/repo/netdev-2.6 branch e100
[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 <linux/inet.h>
17 #include <sys/socket.h>
18 #include <sys/un.h>
19 #include <sys/time.h>
20 #include <netinet/in.h>
21 #include "net_user.h"
22 #include "mcast.h"
23 #include "kern_util.h"
24 #include "user_util.h"
25 #include "user.h"
26 #include "os.h"
27
28 #define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
29
30 static struct sockaddr_in *new_addr(char *addr, unsigned short port)
31 {
32         struct sockaddr_in *sin;
33
34         sin = um_kmalloc(sizeof(struct sockaddr_in));
35         if(sin == NULL){
36                 printk("new_addr: allocation of sockaddr_in failed\n");
37                 return(NULL);
38         }
39         sin->sin_family = AF_INET;
40         sin->sin_addr.s_addr = in_aton(addr);
41         sin->sin_port = htons(port);
42         return(sin);
43 }
44
45 static void mcast_user_init(void *data, void *dev)
46 {
47         struct mcast_data *pri = data;
48
49         pri->mcast_addr = new_addr(pri->addr, pri->port);
50         pri->dev = dev;
51 }
52
53 static int mcast_open(void *data)
54 {
55         struct mcast_data *pri = data;
56         struct sockaddr_in *sin = pri->mcast_addr;
57         struct ip_mreq mreq;
58         int fd = -EINVAL, yes = 1, err = -EINVAL;;
59
60
61         if ((sin->sin_addr.s_addr == 0) || (sin->sin_port == 0))
62                 goto out;
63
64         fd = socket(AF_INET, SOCK_DGRAM, 0);
65
66         if (fd < 0){
67                 printk("mcast_open : data socket failed, errno = %d\n", 
68                        errno);
69                 fd = -errno;
70                 goto out;
71         }
72
73         if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
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                 printk("mcast_open: IP_MULTICAST_TTL failed, error = %d\n",
83                         errno);
84                 goto out_close;
85         }
86
87         /* set LOOP, so data does get fed back to local sockets */
88         if (setsockopt(fd, SOL_IP, IP_MULTICAST_LOOP, &yes, sizeof(yes)) < 0) {
89                 printk("mcast_open: IP_MULTICAST_LOOP failed, error = %d\n",
90                         errno);
91                 goto out_close;
92         }
93
94         /* bind socket to mcast address */
95         if (bind(fd, (struct sockaddr *) sin, sizeof(*sin)) < 0) {
96                 printk("mcast_open : data bind failed, errno = %d\n", errno);
97                 goto out_close;
98         }               
99         
100         /* subscribe to the multicast group */
101         mreq.imr_multiaddr.s_addr = sin->sin_addr.s_addr;
102         mreq.imr_interface.s_addr = 0;
103         if (setsockopt(fd, SOL_IP, IP_ADD_MEMBERSHIP, 
104                        &mreq, sizeof(mreq)) < 0) {
105                 printk("mcast_open: IP_ADD_MEMBERSHIP failed, error = %d\n",
106                         errno);
107                 printk("There appears not to be a multicast-capable network "
108                        "interface on the host.\n");
109                 printk("eth0 should be configured in order to use the "
110                        "multicast transport.\n");
111                 goto out_close;
112         }
113
114  out:
115         return fd;
116
117  out_close:
118         os_close_file(fd);
119         return err;
120 }
121
122 static void mcast_close(int fd, void *data)
123 {
124         struct ip_mreq mreq;
125         struct mcast_data *pri = data;
126         struct sockaddr_in *sin = pri->mcast_addr;
127
128         mreq.imr_multiaddr.s_addr = sin->sin_addr.s_addr;
129         mreq.imr_interface.s_addr = 0;
130         if (setsockopt(fd, SOL_IP, IP_DROP_MEMBERSHIP,
131                        &mreq, sizeof(mreq)) < 0) {
132                 printk("mcast_open: IP_DROP_MEMBERSHIP failed, error = %d\n",
133                         errno);
134         }
135
136         os_close_file(fd);
137 }
138
139 int mcast_user_write(int fd, void *buf, int len, struct mcast_data *pri)
140 {
141         struct sockaddr_in *data_addr = pri->mcast_addr;
142
143         return(net_sendto(fd, buf, len, data_addr, sizeof(*data_addr)));
144 }
145
146 static int mcast_set_mtu(int mtu, void *data)
147 {
148         return(mtu);
149 }
150
151 struct net_user_info mcast_user_info = {
152         .init           = mcast_user_init,
153         .open           = mcast_open,
154         .close          = mcast_close,
155         .remove         = NULL,
156         .set_mtu        = mcast_set_mtu,
157         .add_address    = NULL,
158         .delete_address = NULL,
159         .max_packet     = MAX_PACKET - ETH_HEADER_OTHER
160 };