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authorNolan Leake <nolan@sigbus.net>2011-05-24 20:13:02 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-25 11:39:41 -0400
commit4ff4d8d342fe25c4d1106fb0ffdd310a43d0ace0 (patch)
treeb41ea0ecc007f1c90eceada0db081dc0fb81700c /arch/um/drivers/mcast_user.c
parentd634f194d4e2e58d57927c812aca097e67a2287d (diff)
um: add ucast ethernet transport
The ucast transport is similar to the mcast transport (and, in fact, shares most of its code), only it uses UDP unicast to move packets. Obviously this is only useful for point-to-point connections between virtual ethernet devices. Signed-off-by: Nolan Leake <nolan@cumulusnetworks.com> Signed-off-by: Richard Weinberger <richard@nod.at> Cc: David Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um/drivers/mcast_user.c')
-rw-r--r--arch/um/drivers/mcast_user.c165
1 files changed, 0 insertions, 165 deletions
diff --git a/arch/um/drivers/mcast_user.c b/arch/um/drivers/mcast_user.c
deleted file mode 100644
index ee19e91568a..00000000000
--- a/arch/um/drivers/mcast_user.c
+++ /dev/null
@@ -1,165 +0,0 @@
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
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 sin->sin_addr.s_addr = in_aton(addr);
36 sin->sin_port = htons(port);
37 return sin;
38}
39
40static 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
49static 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
57static 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
132static 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
149int 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
156const 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};
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-20 10:16:05 -0400