diff --git a/Documentation/virtual/uml/UserModeLinux-HOWTO.txt b/Documentation/virtual/uml/UserModeLinux-HOWTO.txt
index 9b7e1904db1c96230336f2799f0cb2501ab7588f..5d0fc8bfcdb9b608bccf03855c33a4d01386d270 100644
--- a/Documentation/virtual/uml/UserModeLinux-HOWTO.txt
+++ b/Documentation/virtual/uml/UserModeLinux-HOWTO.txt
@@ -1182,6 +1182,16 @@
forge.net/> and explains these in detail, as well as
some other issues.
+ There is also a related point-to-point only "ucast" transport.
+ This is useful when your network does not support multicast, and
+ all network connections are simple point to point links.
+
+ The full set of command line options for this transport are
+
+
+ ethn=ucast,ethernet address,remote address,listen port,remote port
+
+
66..66.. TTUUNN//TTAAPP wwiitthh tthhee uummll__nneett hheellppeerr
diff --git a/arch/um/drivers/Makefile b/arch/um/drivers/Makefile
index 1d9b6ae967b089c780afd713932af0bf42900468..e7582e1d248cc91796d94e2fcaa9a6f7b4ef62fc 100644
--- a/arch/um/drivers/Makefile
+++ b/arch/um/drivers/Makefile
@@ -9,7 +9,7 @@
slip-objs := slip_kern.o slip_user.o
slirp-objs := slirp_kern.o slirp_user.o
daemon-objs := daemon_kern.o daemon_user.o
-mcast-objs := mcast_kern.o mcast_user.o
+umcast-objs := umcast_kern.o umcast_user.o
net-objs := net_kern.o net_user.o
mconsole-objs := mconsole_kern.o mconsole_user.o
hostaudio-objs := hostaudio_kern.o
@@ -44,7 +44,7 @@ obj-$(CONFIG_UML_NET_SLIP) += slip.o slip_common.o
obj-$(CONFIG_UML_NET_SLIRP) += slirp.o slip_common.o
obj-$(CONFIG_UML_NET_DAEMON) += daemon.o
obj-$(CONFIG_UML_NET_VDE) += vde.o
-obj-$(CONFIG_UML_NET_MCAST) += mcast.o
+obj-$(CONFIG_UML_NET_MCAST) += umcast.o
obj-$(CONFIG_UML_NET_PCAP) += pcap.o
obj-$(CONFIG_UML_NET) += net.o
obj-$(CONFIG_MCONSOLE) += mconsole.o
diff --git a/arch/um/drivers/mcast.h b/arch/um/drivers/mcast.h
deleted file mode 100644
index 6fa282e896bed2d1938e480b9a92e664346c1de8..0000000000000000000000000000000000000000
--- a/arch/um/drivers/mcast.h
+++ /dev/null
@@ -1,24 +0,0 @@
-/*
- * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- * Licensed under the GPL
- */
-
-#ifndef __DRIVERS_MCAST_H
-#define __DRIVERS_MCAST_H
-
-#include "net_user.h"
-
-struct mcast_data {
- char *addr;
- unsigned short port;
- void *mcast_addr;
- int ttl;
- void *dev;
-};
-
-extern const struct net_user_info mcast_user_info;
-
-extern int mcast_user_write(int fd, void *buf, int len,
- struct mcast_data *pri);
-
-#endif
diff --git a/arch/um/drivers/mcast_kern.c b/arch/um/drivers/mcast_kern.c
deleted file mode 100644
index ffc6416d5ed7f9af80a2490133050098fb8083aa..0000000000000000000000000000000000000000
--- a/arch/um/drivers/mcast_kern.c
+++ /dev/null
@@ -1,120 +0,0 @@
-/*
- * user-mode-linux networking multicast transport
- * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
- * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- *
- * 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 "linux/init.h"
-#include <linux/netdevice.h>
-#include "mcast.h"
-#include "net_kern.h"
-
-struct mcast_init {
- char *addr;
- int port;
- int ttl;
-};
-
-static void mcast_init(struct net_device *dev, void *data)
-{
- struct uml_net_private *pri;
- struct mcast_data *dpri;
- struct mcast_init *init = data;
-
- pri = netdev_priv(dev);
- dpri = (struct mcast_data *) pri->user;
- dpri->addr = init->addr;
- dpri->port = init->port;
- dpri->ttl = init->ttl;
- dpri->dev = dev;
-
- printk("mcast backend multicast address: %s:%u, TTL:%u\n",
- dpri->addr, dpri->port, dpri->ttl);
-}
-
-static int mcast_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
-{
- return net_recvfrom(fd, skb_mac_header(skb),
- skb->dev->mtu + ETH_HEADER_OTHER);
-}
-
-static int mcast_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
-{
- return mcast_user_write(fd, skb->data, skb->len,
- (struct mcast_data *) &lp->user);
-}
-
-static const struct net_kern_info mcast_kern_info = {
- .init = mcast_init,
- .protocol = eth_protocol,
- .read = mcast_read,
- .write = mcast_write,
-};
-
-static int mcast_setup(char *str, char **mac_out, void *data)
-{
- struct mcast_init *init = data;
- char *port_str = NULL, *ttl_str = NULL, *remain;
- char *last;
-
- *init = ((struct mcast_init)
- { .addr = "239.192.168.1",
- .port = 1102,
- .ttl = 1 });
-
- remain = split_if_spec(str, mac_out, &init->addr, &port_str, &ttl_str,
- NULL);
- if (remain != NULL) {
- printk(KERN_ERR "mcast_setup - Extra garbage on "
- "specification : '%s'\n", remain);
- return 0;
- }
-
- if (port_str != NULL) {
- init->port = simple_strtoul(port_str, &last, 10);
- if ((*last != '\0') || (last == port_str)) {
- printk(KERN_ERR "mcast_setup - Bad port : '%s'\n",
- port_str);
- return 0;
- }
- }
-
- if (ttl_str != NULL) {
- init->ttl = simple_strtoul(ttl_str, &last, 10);
- if ((*last != '\0') || (last == ttl_str)) {
- printk(KERN_ERR "mcast_setup - Bad ttl : '%s'\n",
- ttl_str);
- return 0;
- }
- }
-
- printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr,
- init->port, init->ttl);
-
- return 1;
-}
-
-static struct transport mcast_transport = {
- .list = LIST_HEAD_INIT(mcast_transport.list),
- .name = "mcast",
- .setup = mcast_setup,
- .user = &mcast_user_info,
- .kern = &mcast_kern_info,
- .private_size = sizeof(struct mcast_data),
- .setup_size = sizeof(struct mcast_init),
-};
-
-static int register_mcast(void)
-{
- register_transport(&mcast_transport);
- return 0;
-}
-
-late_initcall(register_mcast);
diff --git a/arch/um/drivers/mcast_user.c b/arch/um/drivers/mcast_user.c
deleted file mode 100644
index ee19e91568a2585765127970fc9d1ba821bcc613..0000000000000000000000000000000000000000
--- a/arch/um/drivers/mcast_user.c
+++ /dev/null
@@ -1,165 +0,0 @@
-/*
- * 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,
-};
diff --git a/arch/um/drivers/umcast.h b/arch/um/drivers/umcast.h
new file mode 100644
index 0000000000000000000000000000000000000000..6f8c0fe890fb89ee53e3ea0160ded80f586bb1b0
--- /dev/null
+++ b/arch/um/drivers/umcast.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __DRIVERS_UMCAST_H
+#define __DRIVERS_UMCAST_H
+
+#include "net_user.h"
+
+struct umcast_data {
+ char *addr;
+ unsigned short lport;
+ unsigned short rport;
+ void *listen_addr;
+ void *remote_addr;
+ int ttl;
+ int unicast;
+ void *dev;
+};
+
+extern const struct net_user_info umcast_user_info;
+
+extern int umcast_user_write(int fd, void *buf, int len,
+ struct umcast_data *pri);
+
+#endif
diff --git a/arch/um/drivers/umcast_kern.c b/arch/um/drivers/umcast_kern.c
new file mode 100644
index 0000000000000000000000000000000000000000..42dab11d2ecf5e76482c40005c590f3962c1c067
--- /dev/null
+++ b/arch/um/drivers/umcast_kern.c
@@ -0,0 +1,188 @@
+/*
+ * user-mode-linux networking multicast transport
+ * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ *
+ * 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 "linux/init.h"
+#include <linux/netdevice.h>
+#include "umcast.h"
+#include "net_kern.h"
+
+struct umcast_init {
+ char *addr;
+ int lport;
+ int rport;
+ int ttl;
+ bool unicast;
+};
+
+static void umcast_init(struct net_device *dev, void *data)
+{
+ struct uml_net_private *pri;
+ struct umcast_data *dpri;
+ struct umcast_init *init = data;
+
+ pri = netdev_priv(dev);
+ dpri = (struct umcast_data *) pri->user;
+ dpri->addr = init->addr;
+ dpri->lport = init->lport;
+ dpri->rport = init->rport;
+ dpri->unicast = init->unicast;
+ dpri->ttl = init->ttl;
+ dpri->dev = dev;
+
+ if (dpri->unicast) {
+ printk(KERN_INFO "ucast backend address: %s:%u listen port: "
+ "%u\n", dpri->addr, dpri->rport, dpri->lport);
+ } else {
+ printk(KERN_INFO "mcast backend multicast address: %s:%u, "
+ "TTL:%u\n", dpri->addr, dpri->lport, dpri->ttl);
+ }
+}
+
+static int umcast_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return net_recvfrom(fd, skb_mac_header(skb),
+ skb->dev->mtu + ETH_HEADER_OTHER);
+}
+
+static int umcast_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return umcast_user_write(fd, skb->data, skb->len,
+ (struct umcast_data *) &lp->user);
+}
+
+static const struct net_kern_info umcast_kern_info = {
+ .init = umcast_init,
+ .protocol = eth_protocol,
+ .read = umcast_read,
+ .write = umcast_write,
+};
+
+static int mcast_setup(char *str, char **mac_out, void *data)
+{
+ struct umcast_init *init = data;
+ char *port_str = NULL, *ttl_str = NULL, *remain;
+ char *last;
+
+ *init = ((struct umcast_init)
+ { .addr = "239.192.168.1",
+ .lport = 1102,
+ .ttl = 1 });
+
+ remain = split_if_spec(str, mac_out, &init->addr, &port_str, &ttl_str,
+ NULL);
+ if (remain != NULL) {
+ printk(KERN_ERR "mcast_setup - Extra garbage on "
+ "specification : '%s'\n", remain);
+ return 0;
+ }
+
+ if (port_str != NULL) {
+ init->lport = simple_strtoul(port_str, &last, 10);
+ if ((*last != '\0') || (last == port_str)) {
+ printk(KERN_ERR "mcast_setup - Bad port : '%s'\n",
+ port_str);
+ return 0;
+ }
+ }
+
+ if (ttl_str != NULL) {
+ init->ttl = simple_strtoul(ttl_str, &last, 10);
+ if ((*last != '\0') || (last == ttl_str)) {
+ printk(KERN_ERR "mcast_setup - Bad ttl : '%s'\n",
+ ttl_str);
+ return 0;
+ }
+ }
+
+ init->unicast = false;
+ init->rport = init->lport;
+
+ printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr,
+ init->lport, init->ttl);
+
+ return 1;
+}
+
+static int ucast_setup(char *str, char **mac_out, void *data)
+{
+ struct umcast_init *init = data;
+ char *lport_str = NULL, *rport_str = NULL, *remain;
+ char *last;
+
+ *init = ((struct umcast_init)
+ { .addr = "",
+ .lport = 1102,
+ .rport = 1102 });
+
+ remain = split_if_spec(str, mac_out, &init->addr,
+ &lport_str, &rport_str, NULL);
+ if (remain != NULL) {
+ printk(KERN_ERR "ucast_setup - Extra garbage on "
+ "specification : '%s'\n", remain);
+ return 0;
+ }
+
+ if (lport_str != NULL) {
+ init->lport = simple_strtoul(lport_str, &last, 10);
+ if ((*last != '\0') || (last == lport_str)) {
+ printk(KERN_ERR "ucast_setup - Bad listen port : "
+ "'%s'\n", lport_str);
+ return 0;
+ }
+ }
+
+ if (rport_str != NULL) {
+ init->rport = simple_strtoul(rport_str, &last, 10);
+ if ((*last != '\0') || (last == rport_str)) {
+ printk(KERN_ERR "ucast_setup - Bad remote port : "
+ "'%s'\n", rport_str);
+ return 0;
+ }
+ }
+
+ init->unicast = true;
+
+ printk(KERN_INFO "Configured ucast device: :%u -> %s:%u\n",
+ init->lport, init->addr, init->rport);
+
+ return 1;
+}
+
+static struct transport mcast_transport = {
+ .list = LIST_HEAD_INIT(mcast_transport.list),
+ .name = "mcast",
+ .setup = mcast_setup,
+ .user = &umcast_user_info,
+ .kern = &umcast_kern_info,
+ .private_size = sizeof(struct umcast_data),
+ .setup_size = sizeof(struct umcast_init),
+};
+
+static struct transport ucast_transport = {
+ .list = LIST_HEAD_INIT(ucast_transport.list),
+ .name = "ucast",
+ .setup = ucast_setup,
+ .user = &umcast_user_info,
+ .kern = &umcast_kern_info,
+ .private_size = sizeof(struct umcast_data),
+ .setup_size = sizeof(struct umcast_init),
+};
+
+static int register_umcast(void)
+{
+ register_transport(&mcast_transport);
+ register_transport(&ucast_transport);
+ return 0;
+}
+
+late_initcall(register_umcast);
diff --git a/arch/um/drivers/umcast_user.c b/arch/um/drivers/umcast_user.c
new file mode 100644
index 0000000000000000000000000000000000000000..59c56fd6f52a1698493ae5d010196602d998212d
--- /dev/null
+++ b/arch/um/drivers/umcast_user.c
@@ -0,0 +1,186 @@
+/*
+ * 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 "umcast.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;
+ if (addr)
+ sin->sin_addr.s_addr = in_aton(addr);
+ else
+ sin->sin_addr.s_addr = INADDR_ANY;
+ sin->sin_port = htons(port);
+ return sin;
+}
+
+static int umcast_user_init(void *data, void *dev)
+{
+ struct umcast_data *pri = data;
+
+ pri->remote_addr = new_addr(pri->addr, pri->rport);
+ if (pri->unicast)
+ pri->listen_addr = new_addr(NULL, pri->lport);
+ else
+ pri->listen_addr = pri->remote_addr;
+ pri->dev = dev;
+ return 0;
+}
+
+static void umcast_remove(void *data)
+{
+ struct umcast_data *pri = data;
+
+ kfree(pri->listen_addr);
+ if (pri->unicast)
+ kfree(pri->remote_addr);
+ pri->listen_addr = pri->remote_addr = NULL;
+}
+
+static int umcast_open(void *data)
+{
+ struct umcast_data *pri = data;
+ struct sockaddr_in *lsin = pri->listen_addr;
+ struct sockaddr_in *rsin = pri->remote_addr;
+ struct ip_mreq mreq;
+ int fd, yes = 1, err = -EINVAL;
+
+
+ if ((!pri->unicast && lsin->sin_addr.s_addr == 0) ||
+ (rsin->sin_addr.s_addr == 0) ||
+ (lsin->sin_port == 0) || (rsin->sin_port == 0))
+ goto out;
+
+ fd = socket(AF_INET, SOCK_DGRAM, 0);
+
+ if (fd < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "umcast_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 "umcast_open: SO_REUSEADDR failed, "
+ "errno = %d\n", errno);
+ goto out_close;
+ }
+
+ if (!pri->unicast) {
+ /* 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 "umcast_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 "umcast_open: IP_MULTICAST_LOOP "
+ "failed, error = %d\n", errno);
+ goto out_close;
+ }
+ }
+
+ /* bind socket to the address */
+ if (bind(fd, (struct sockaddr *) lsin, sizeof(*lsin)) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "umcast_open : data bind failed, "
+ "errno = %d\n", errno);
+ goto out_close;
+ }
+
+ if (!pri->unicast) {
+ /* subscribe to the multicast group */
+ mreq.imr_multiaddr.s_addr = lsin->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 "umcast_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 umcast_close(int fd, void *data)
+{
+ struct umcast_data *pri = data;
+
+ if (!pri->unicast) {
+ struct ip_mreq mreq;
+ struct sockaddr_in *lsin = pri->listen_addr;
+
+ mreq.imr_multiaddr.s_addr = lsin->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 "umcast_close: IP_DROP_MEMBERSHIP "
+ "failed, error = %d\n", errno);
+ }
+ }
+
+ close(fd);
+}
+
+int umcast_user_write(int fd, void *buf, int len, struct umcast_data *pri)
+{
+ struct sockaddr_in *data_addr = pri->remote_addr;
+
+ return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr));
+}
+
+const struct net_user_info umcast_user_info = {
+ .init = umcast_user_init,
+ .open = umcast_open,
+ .close = umcast_close,
+ .remove = umcast_remove,
+ .add_address = NULL,
+ .delete_address = NULL,
+ .mtu = ETH_MAX_PACKET,
+ .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
+};