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>
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.
11 * Licensed under the GPL.
17 #include <netinet/in.h>
18 #include "kern_constants.h"
21 #include "um_malloc.h"
24 static struct sockaddr_in *new_addr(char *addr, unsigned short port)
26 struct sockaddr_in *sin;
28 sin = uml_kmalloc(sizeof(struct sockaddr_in), UM_GFP_KERNEL);
30 printk(UM_KERN_ERR "new_addr: allocation of sockaddr_in "
34 sin->sin_family = AF_INET;
36 sin->sin_addr.s_addr = in_aton(addr);
38 sin->sin_addr.s_addr = INADDR_ANY;
39 sin->sin_port = htons(port);
43 static int umcast_user_init(void *data, void *dev)
45 struct umcast_data *pri = data;
47 pri->remote_addr = new_addr(pri->addr, pri->rport);
49 pri->listen_addr = new_addr(NULL, pri->lport);
51 pri->listen_addr = pri->remote_addr;
56 static void umcast_remove(void *data)
58 struct umcast_data *pri = data;
60 kfree(pri->listen_addr);
62 kfree(pri->remote_addr);
63 pri->listen_addr = pri->remote_addr = NULL;
66 static int umcast_open(void *data)
68 struct umcast_data *pri = data;
69 struct sockaddr_in *lsin = pri->listen_addr;
70 struct sockaddr_in *rsin = pri->remote_addr;
72 int fd, yes = 1, err = -EINVAL;
75 if ((!pri->unicast && lsin->sin_addr.s_addr == 0) ||
76 (rsin->sin_addr.s_addr == 0) ||
77 (lsin->sin_port == 0) || (rsin->sin_port == 0))
80 fd = socket(AF_INET, SOCK_DGRAM, 0);
84 printk(UM_KERN_ERR "umcast_open : data socket failed, "
85 "errno = %d\n", errno);
89 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
91 printk(UM_KERN_ERR "umcast_open: SO_REUSEADDR failed, "
92 "errno = %d\n", errno);
97 /* set ttl according to config */
98 if (setsockopt(fd, SOL_IP, IP_MULTICAST_TTL, &pri->ttl,
99 sizeof(pri->ttl)) < 0) {
101 printk(UM_KERN_ERR "umcast_open: IP_MULTICAST_TTL "
102 "failed, error = %d\n", errno);
106 /* set LOOP, so data does get fed back to local sockets */
107 if (setsockopt(fd, SOL_IP, IP_MULTICAST_LOOP,
108 &yes, sizeof(yes)) < 0) {
110 printk(UM_KERN_ERR "umcast_open: IP_MULTICAST_LOOP "
111 "failed, error = %d\n", errno);
116 /* bind socket to the address */
117 if (bind(fd, (struct sockaddr *) lsin, sizeof(*lsin)) < 0) {
119 printk(UM_KERN_ERR "umcast_open : data bind failed, "
120 "errno = %d\n", errno);
125 /* subscribe to the multicast group */
126 mreq.imr_multiaddr.s_addr = lsin->sin_addr.s_addr;
127 mreq.imr_interface.s_addr = 0;
128 if (setsockopt(fd, SOL_IP, IP_ADD_MEMBERSHIP,
129 &mreq, sizeof(mreq)) < 0) {
131 printk(UM_KERN_ERR "umcast_open: IP_ADD_MEMBERSHIP "
132 "failed, error = %d\n", errno);
133 printk(UM_KERN_ERR "There appears not to be a "
134 "multicast-capable network interface on the "
136 printk(UM_KERN_ERR "eth0 should be configured in order "
137 "to use the multicast transport.\n");
150 static void umcast_close(int fd, void *data)
152 struct umcast_data *pri = data;
156 struct sockaddr_in *lsin = pri->listen_addr;
158 mreq.imr_multiaddr.s_addr = lsin->sin_addr.s_addr;
159 mreq.imr_interface.s_addr = 0;
160 if (setsockopt(fd, SOL_IP, IP_DROP_MEMBERSHIP,
161 &mreq, sizeof(mreq)) < 0) {
162 printk(UM_KERN_ERR "umcast_close: IP_DROP_MEMBERSHIP "
163 "failed, error = %d\n", errno);
170 int umcast_user_write(int fd, void *buf, int len, struct umcast_data *pri)
172 struct sockaddr_in *data_addr = pri->remote_addr;
174 return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr));
177 const struct net_user_info umcast_user_info = {
178 .init = umcast_user_init,
180 .close = umcast_close,
181 .remove = umcast_remove,
183 .delete_address = NULL,
184 .mtu = ETH_MAX_PACKET,
185 .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,