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1 /*
2  * user-mode-linux networking multicast transport
3  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4  * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
5  *
6  * based on the existing uml-networking code, which is
7  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
8  * James Leu (jleu@mindspring.net).
9  * Copyright (C) 2001 by various other people who didn't put their name here.
10  *
11  * Licensed under the GPL.
12  *
13  */
14
15 #include <unistd.h>
16 #include <errno.h>
17 #include <netinet/in.h>
18 #include "kern_constants.h"
19 #include "mcast.h"
20 #include "net_user.h"
21 #include "um_malloc.h"
22 #include "user.h"
23
24 static struct sockaddr_in *new_addr(char *addr, unsigned short port)
25 {
26         struct sockaddr_in *sin;
27
28         sin = uml_kmalloc(sizeof(struct sockaddr_in), UM_GFP_KERNEL);
29         if (sin == NULL) {
30                 printk(UM_KERN_ERR "new_addr: allocation of sockaddr_in "
31                        "failed\n");
32                 return NULL;
33         }
34         sin->sin_family = AF_INET;
35         sin->sin_addr.s_addr = in_aton(addr);
36         sin->sin_port = htons(port);
37         return sin;
38 }
39
40 static int mcast_user_init(void *data, void *dev)
41 {
42         struct mcast_data *pri = data;
43
44         pri->mcast_addr = new_addr(pri->addr, pri->port);
45         pri->dev = dev;
46         return 0;
47 }
48
49 static void mcast_remove(void *data)
50 {
51         struct mcast_data *pri = data;
52
53         kfree(pri->mcast_addr);
54         pri->mcast_addr = NULL;
55 }
56
57 static int mcast_open(void *data)
58 {
59         struct mcast_data *pri = data;
60         struct sockaddr_in *sin = pri->mcast_addr;
61         struct ip_mreq mreq;
62         int fd, yes = 1, err = -EINVAL;
63
64
65         if ((sin->sin_addr.s_addr == 0) || (sin->sin_port == 0))
66                 goto out;
67
68         fd = socket(AF_INET, SOCK_DGRAM, 0);
69
70         if (fd < 0) {
71                 err = -errno;
72                 printk(UM_KERN_ERR "mcast_open : data socket failed, "
73                        "errno = %d\n", errno);
74                 goto out;
75         }
76
77         if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
78                 err = -errno;
79                 printk(UM_KERN_ERR "mcast_open: SO_REUSEADDR failed, "
80                        "errno = %d\n", errno);
81                 goto out_close;
82         }
83
84         /* set ttl according to config */
85         if (setsockopt(fd, SOL_IP, IP_MULTICAST_TTL, &pri->ttl,
86                        sizeof(pri->ttl)) < 0) {
87                 err = -errno;
88                 printk(UM_KERN_ERR "mcast_open: IP_MULTICAST_TTL failed, "
89                        "error = %d\n", errno);
90                 goto out_close;
91         }
92
93         /* set LOOP, so data does get fed back to local sockets */
94         if (setsockopt(fd, SOL_IP, IP_MULTICAST_LOOP, &yes, sizeof(yes)) < 0) {
95                 err = -errno;
96                 printk(UM_KERN_ERR "mcast_open: IP_MULTICAST_LOOP failed, "
97                        "error = %d\n", errno);
98                 goto out_close;
99         }
100
101         /* bind socket to mcast address */
102         if (bind(fd, (struct sockaddr *) sin, sizeof(*sin)) < 0) {
103                 err = -errno;
104                 printk(UM_KERN_ERR "mcast_open : data bind failed, "
105                        "errno = %d\n", errno);
106                 goto out_close;
107         }
108
109         /* subscribe to the multicast group */
110         mreq.imr_multiaddr.s_addr = sin->sin_addr.s_addr;
111         mreq.imr_interface.s_addr = 0;
112         if (setsockopt(fd, SOL_IP, IP_ADD_MEMBERSHIP,
113                        &mreq, sizeof(mreq)) < 0) {
114                 err = -errno;
115                 printk(UM_KERN_ERR "mcast_open: IP_ADD_MEMBERSHIP failed, "
116                        "error = %d\n", errno);
117                 printk(UM_KERN_ERR "There appears not to be a multicast-"
118                        "capable network interface on the host.\n");
119                 printk(UM_KERN_ERR "eth0 should be configured in order to use "
120                        "the multicast transport.\n");
121                 goto out_close;
122         }
123
124         return fd;
125
126  out_close:
127         close(fd);
128  out:
129         return err;
130 }
131
132 static void mcast_close(int fd, void *data)
133 {
134         struct ip_mreq mreq;
135         struct mcast_data *pri = data;
136         struct sockaddr_in *sin = pri->mcast_addr;
137
138         mreq.imr_multiaddr.s_addr = sin->sin_addr.s_addr;
139         mreq.imr_interface.s_addr = 0;
140         if (setsockopt(fd, SOL_IP, IP_DROP_MEMBERSHIP,
141                        &mreq, sizeof(mreq)) < 0) {
142                 printk(UM_KERN_ERR "mcast_open: IP_DROP_MEMBERSHIP failed, "
143                        "error = %d\n", errno);
144         }
145
146         close(fd);
147 }
148
149 int mcast_user_write(int fd, void *buf, int len, struct mcast_data *pri)
150 {
151         struct sockaddr_in *data_addr = pri->mcast_addr;
152
153         return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr));
154 }
155
156 const struct net_user_info mcast_user_info = {
157         .init           = mcast_user_init,
158         .open           = mcast_open,
159         .close          = mcast_close,
160         .remove         = mcast_remove,
161         .add_address    = NULL,
162         .delete_address = NULL,
163         .mtu            = ETH_MAX_PACKET,
164         .max_packet     = ETH_MAX_PACKET + ETH_HEADER_OTHER,
165 };