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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * user-mode-linux networking multicast transport
4 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
5 * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
6 *
7 * based on the existing uml-networking code, which is
8 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
9 * James Leu (jleu@mindspring.net).
10 * Copyright (C) 2001 by various other people who didn't put their name here.
11 *
12 *
13 */
14
15#include <unistd.h>
16#include <errno.h>
17#include <netinet/in.h>
18#include "umcast.h"
19#include <net_user.h>
20#include <um_malloc.h>
21
22static struct sockaddr_in *new_addr(char *addr, unsigned short port)
23{
24 struct sockaddr_in *sin;
25
26 sin = uml_kmalloc(sizeof(struct sockaddr_in), UM_GFP_KERNEL);
27 if (sin == NULL) {
28 printk(UM_KERN_ERR "new_addr: allocation of sockaddr_in "
29 "failed\n");
30 return NULL;
31 }
32 sin->sin_family = AF_INET;
33 if (addr)
34 sin->sin_addr.s_addr = in_aton(addr);
35 else
36 sin->sin_addr.s_addr = INADDR_ANY;
37 sin->sin_port = htons(port);
38 return sin;
39}
40
41static int umcast_user_init(void *data, void *dev)
42{
43 struct umcast_data *pri = data;
44
45 pri->remote_addr = new_addr(pri->addr, pri->rport);
46 if (pri->unicast)
47 pri->listen_addr = new_addr(NULL, pri->lport);
48 else
49 pri->listen_addr = pri->remote_addr;
50 pri->dev = dev;
51 return 0;
52}
53
54static void umcast_remove(void *data)
55{
56 struct umcast_data *pri = data;
57
58 kfree(pri->listen_addr);
59 if (pri->unicast)
60 kfree(pri->remote_addr);
61 pri->listen_addr = pri->remote_addr = NULL;
62}
63
64static int umcast_open(void *data)
65{
66 struct umcast_data *pri = data;
67 struct sockaddr_in *lsin = pri->listen_addr;
68 struct sockaddr_in *rsin = pri->remote_addr;
69 struct ip_mreq mreq;
70 int fd, yes = 1, err = -EINVAL;
71
72
73 if ((!pri->unicast && lsin->sin_addr.s_addr == 0) ||
74 (rsin->sin_addr.s_addr == 0) ||
75 (lsin->sin_port == 0) || (rsin->sin_port == 0))
76 goto out;
77
78 fd = socket(AF_INET, SOCK_DGRAM, 0);
79
80 if (fd < 0) {
81 err = -errno;
82 printk(UM_KERN_ERR "umcast_open : data socket failed, "
83 "errno = %d\n", errno);
84 goto out;
85 }
86
87 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
88 err = -errno;
89 printk(UM_KERN_ERR "umcast_open: SO_REUSEADDR failed, "
90 "errno = %d\n", errno);
91 goto out_close;
92 }
93
94 if (!pri->unicast) {
95 /* set ttl according to config */
96 if (setsockopt(fd, SOL_IP, IP_MULTICAST_TTL, &pri->ttl,
97 sizeof(pri->ttl)) < 0) {
98 err = -errno;
99 printk(UM_KERN_ERR "umcast_open: IP_MULTICAST_TTL "
100 "failed, error = %d\n", errno);
101 goto out_close;
102 }
103
104 /* set LOOP, so data does get fed back to local sockets */
105 if (setsockopt(fd, SOL_IP, IP_MULTICAST_LOOP,
106 &yes, sizeof(yes)) < 0) {
107 err = -errno;
108 printk(UM_KERN_ERR "umcast_open: IP_MULTICAST_LOOP "
109 "failed, error = %d\n", errno);
110 goto out_close;
111 }
112 }
113
114 /* bind socket to the address */
115 if (bind(fd, (struct sockaddr *) lsin, sizeof(*lsin)) < 0) {
116 err = -errno;
117 printk(UM_KERN_ERR "umcast_open : data bind failed, "
118 "errno = %d\n", errno);
119 goto out_close;
120 }
121
122 if (!pri->unicast) {
123 /* subscribe to the multicast group */
124 mreq.imr_multiaddr.s_addr = lsin->sin_addr.s_addr;
125 mreq.imr_interface.s_addr = 0;
126 if (setsockopt(fd, SOL_IP, IP_ADD_MEMBERSHIP,
127 &mreq, sizeof(mreq)) < 0) {
128 err = -errno;
129 printk(UM_KERN_ERR "umcast_open: IP_ADD_MEMBERSHIP "
130 "failed, error = %d\n", errno);
131 printk(UM_KERN_ERR "There appears not to be a "
132 "multicast-capable network interface on the "
133 "host.\n");
134 printk(UM_KERN_ERR "eth0 should be configured in order "
135 "to use the multicast transport.\n");
136 goto out_close;
137 }
138 }
139
140 return fd;
141
142 out_close:
143 close(fd);
144 out:
145 return err;
146}
147
148static void umcast_close(int fd, void *data)
149{
150 struct umcast_data *pri = data;
151
152 if (!pri->unicast) {
153 struct ip_mreq mreq;
154 struct sockaddr_in *lsin = pri->listen_addr;
155
156 mreq.imr_multiaddr.s_addr = lsin->sin_addr.s_addr;
157 mreq.imr_interface.s_addr = 0;
158 if (setsockopt(fd, SOL_IP, IP_DROP_MEMBERSHIP,
159 &mreq, sizeof(mreq)) < 0) {
160 printk(UM_KERN_ERR "umcast_close: IP_DROP_MEMBERSHIP "
161 "failed, error = %d\n", errno);
162 }
163 }
164
165 close(fd);
166}
167
168int umcast_user_write(int fd, void *buf, int len, struct umcast_data *pri)
169{
170 struct sockaddr_in *data_addr = pri->remote_addr;
171
172 return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr));
173}
174
175const struct net_user_info umcast_user_info = {
176 .init = umcast_user_init,
177 .open = umcast_open,
178 .close = umcast_close,
179 .remove = umcast_remove,
180 .add_address = NULL,
181 .delete_address = NULL,
182 .mtu = ETH_MAX_PACKET,
183 .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
184};
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 "umcast.h"
20#include "net_user.h"
21#include "um_malloc.h"
22#include "user.h"
23
24static 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 if (addr)
36 sin->sin_addr.s_addr = in_aton(addr);
37 else
38 sin->sin_addr.s_addr = INADDR_ANY;
39 sin->sin_port = htons(port);
40 return sin;
41}
42
43static int umcast_user_init(void *data, void *dev)
44{
45 struct umcast_data *pri = data;
46
47 pri->remote_addr = new_addr(pri->addr, pri->rport);
48 if (pri->unicast)
49 pri->listen_addr = new_addr(NULL, pri->lport);
50 else
51 pri->listen_addr = pri->remote_addr;
52 pri->dev = dev;
53 return 0;
54}
55
56static void umcast_remove(void *data)
57{
58 struct umcast_data *pri = data;
59
60 kfree(pri->listen_addr);
61 if (pri->unicast)
62 kfree(pri->remote_addr);
63 pri->listen_addr = pri->remote_addr = NULL;
64}
65
66static int umcast_open(void *data)
67{
68 struct umcast_data *pri = data;
69 struct sockaddr_in *lsin = pri->listen_addr;
70 struct sockaddr_in *rsin = pri->remote_addr;
71 struct ip_mreq mreq;
72 int fd, yes = 1, err = -EINVAL;
73
74
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))
78 goto out;
79
80 fd = socket(AF_INET, SOCK_DGRAM, 0);
81
82 if (fd < 0) {
83 err = -errno;
84 printk(UM_KERN_ERR "umcast_open : data socket failed, "
85 "errno = %d\n", errno);
86 goto out;
87 }
88
89 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
90 err = -errno;
91 printk(UM_KERN_ERR "umcast_open: SO_REUSEADDR failed, "
92 "errno = %d\n", errno);
93 goto out_close;
94 }
95
96 if (!pri->unicast) {
97 /* set ttl according to config */
98 if (setsockopt(fd, SOL_IP, IP_MULTICAST_TTL, &pri->ttl,
99 sizeof(pri->ttl)) < 0) {
100 err = -errno;
101 printk(UM_KERN_ERR "umcast_open: IP_MULTICAST_TTL "
102 "failed, error = %d\n", errno);
103 goto out_close;
104 }
105
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) {
109 err = -errno;
110 printk(UM_KERN_ERR "umcast_open: IP_MULTICAST_LOOP "
111 "failed, error = %d\n", errno);
112 goto out_close;
113 }
114 }
115
116 /* bind socket to the address */
117 if (bind(fd, (struct sockaddr *) lsin, sizeof(*lsin)) < 0) {
118 err = -errno;
119 printk(UM_KERN_ERR "umcast_open : data bind failed, "
120 "errno = %d\n", errno);
121 goto out_close;
122 }
123
124 if (!pri->unicast) {
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) {
130 err = -errno;
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 "
135 "host.\n");
136 printk(UM_KERN_ERR "eth0 should be configured in order "
137 "to use the multicast transport.\n");
138 goto out_close;
139 }
140 }
141
142 return fd;
143
144 out_close:
145 close(fd);
146 out:
147 return err;
148}
149
150static void umcast_close(int fd, void *data)
151{
152 struct umcast_data *pri = data;
153
154 if (!pri->unicast) {
155 struct ip_mreq mreq;
156 struct sockaddr_in *lsin = pri->listen_addr;
157
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);
164 }
165 }
166
167 close(fd);
168}
169
170int umcast_user_write(int fd, void *buf, int len, struct umcast_data *pri)
171{
172 struct sockaddr_in *data_addr = pri->remote_addr;
173
174 return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr));
175}
176
177const struct net_user_info umcast_user_info = {
178 .init = umcast_user_init,
179 .open = umcast_open,
180 .close = umcast_close,
181 .remove = umcast_remove,
182 .add_address = NULL,
183 .delete_address = NULL,
184 .mtu = ETH_MAX_PACKET,
185 .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
186};