linux/arch/um/drivers/mcast_user.c
Jeff Dike 43f5b3085f uml: fix build when SLOB is enabled
Reintroduce uml_kmalloc for the benefit of UML libc code.  The
previous tactic of declaring __kmalloc so it could be called directly
from the libc side of the house turned out to be getting too intimate
with slab, and it doesn't work with slob.

So, the uml_kmalloc wrapper is back.  It calls kmalloc or whatever
that translates into, and libc code calls it.

kfree is left alone since that still works, leaving a somewhat
inconsistent API.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-13 08:02:22 -07:00

165 lines
4.1 KiB
C

/*
* user-mode-linux networking multicast transport
* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
*
* based on the existing uml-networking code, which is
* Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
* James Leu (jleu@mindspring.net).
* Copyright (C) 2001 by various other people who didn't put their name here.
*
* Licensed under the GPL.
*
*/
#include <unistd.h>
#include <errno.h>
#include <netinet/in.h>
#include "kern_constants.h"
#include "mcast.h"
#include "net_user.h"
#include "um_malloc.h"
#include "user.h"
static struct sockaddr_in *new_addr(char *addr, unsigned short port)
{
struct sockaddr_in *sin;
sin = uml_kmalloc(sizeof(struct sockaddr_in), UM_GFP_KERNEL);
if (sin == NULL) {
printk(UM_KERN_ERR "new_addr: allocation of sockaddr_in "
"failed\n");
return NULL;
}
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = in_aton(addr);
sin->sin_port = htons(port);
return sin;
}
static int mcast_user_init(void *data, void *dev)
{
struct mcast_data *pri = data;
pri->mcast_addr = new_addr(pri->addr, pri->port);
pri->dev = dev;
return 0;
}
static void mcast_remove(void *data)
{
struct mcast_data *pri = data;
kfree(pri->mcast_addr);
pri->mcast_addr = NULL;
}
static int mcast_open(void *data)
{
struct mcast_data *pri = data;
struct sockaddr_in *sin = pri->mcast_addr;
struct ip_mreq mreq;
int fd, yes = 1, err = -EINVAL;
if ((sin->sin_addr.s_addr == 0) || (sin->sin_port == 0))
goto out;
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
err = -errno;
printk(UM_KERN_ERR "mcast_open : data socket failed, "
"errno = %d\n", errno);
goto out;
}
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
err = -errno;
printk(UM_KERN_ERR "mcast_open: SO_REUSEADDR failed, "
"errno = %d\n", errno);
goto out_close;
}
/* set ttl according to config */
if (setsockopt(fd, SOL_IP, IP_MULTICAST_TTL, &pri->ttl,
sizeof(pri->ttl)) < 0) {
err = -errno;
printk(UM_KERN_ERR "mcast_open: IP_MULTICAST_TTL failed, "
"error = %d\n", errno);
goto out_close;
}
/* set LOOP, so data does get fed back to local sockets */
if (setsockopt(fd, SOL_IP, IP_MULTICAST_LOOP, &yes, sizeof(yes)) < 0) {
err = -errno;
printk(UM_KERN_ERR "mcast_open: IP_MULTICAST_LOOP failed, "
"error = %d\n", errno);
goto out_close;
}
/* bind socket to mcast address */
if (bind(fd, (struct sockaddr *) sin, sizeof(*sin)) < 0) {
err = -errno;
printk(UM_KERN_ERR "mcast_open : data bind failed, "
"errno = %d\n", errno);
goto out_close;
}
/* subscribe to the multicast group */
mreq.imr_multiaddr.s_addr = sin->sin_addr.s_addr;
mreq.imr_interface.s_addr = 0;
if (setsockopt(fd, SOL_IP, IP_ADD_MEMBERSHIP,
&mreq, sizeof(mreq)) < 0) {
err = -errno;
printk(UM_KERN_ERR "mcast_open: IP_ADD_MEMBERSHIP failed, "
"error = %d\n", errno);
printk(UM_KERN_ERR "There appears not to be a multicast-"
"capable network interface on the host.\n");
printk(UM_KERN_ERR "eth0 should be configured in order to use "
"the multicast transport.\n");
goto out_close;
}
return fd;
out_close:
close(fd);
out:
return err;
}
static void mcast_close(int fd, void *data)
{
struct ip_mreq mreq;
struct mcast_data *pri = data;
struct sockaddr_in *sin = pri->mcast_addr;
mreq.imr_multiaddr.s_addr = sin->sin_addr.s_addr;
mreq.imr_interface.s_addr = 0;
if (setsockopt(fd, SOL_IP, IP_DROP_MEMBERSHIP,
&mreq, sizeof(mreq)) < 0) {
printk(UM_KERN_ERR "mcast_open: IP_DROP_MEMBERSHIP failed, "
"error = %d\n", errno);
}
close(fd);
}
int mcast_user_write(int fd, void *buf, int len, struct mcast_data *pri)
{
struct sockaddr_in *data_addr = pri->mcast_addr;
return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr));
}
const struct net_user_info mcast_user_info = {
.init = mcast_user_init,
.open = mcast_open,
.close = mcast_close,
.remove = mcast_remove,
.add_address = NULL,
.delete_address = NULL,
.mtu = ETH_MAX_PACKET,
.max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
};