From: Jeff Dike Date: Tue, 16 Oct 2007 08:26:48 +0000 (-0700) Subject: uml: add VDE networking support X-Git-Tag: v2.6.24-rc1~1072 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ad43c3565bebada7e5a13288e37542fd940369e8;p=linux-2.6 uml: add VDE networking support Added vde network backend in uml to introduce native Virtual Distributed Ethernet support (using libvdeplug). Signed-off-by: Luca Bigliardi Signed-off-by: Jeff Dike Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/um/Kconfig.net b/arch/um/Kconfig.net index 14a04ebdea..66e50026ad 100644 --- a/arch/um/Kconfig.net +++ b/arch/um/Kconfig.net @@ -108,6 +108,28 @@ config UML_NET_DAEMON more than one without conflict. If you don't need UML networking, say N. +config UML_NET_VDE + bool "VDE transport" + depends on UML_NET + help + This User-Mode Linux network transport allows one or more running + UMLs on a single host to communicate with each other and also + with the rest of the world using Virtual Distributed Ethernet, + an improved fork of uml_switch. + + You must have libvdeplug installed in order to build the vde + transport into UML. + + To use this form of networking, you will need to run vde_switch + on the host. + + For more information, see + That site has a good overview of what VDE is and also examples + of the UML command line to use to enable VDE networking. + + If you need UML networking with VDE, + say Y. + config UML_NET_MCAST bool "Multicast transport" depends on UML_NET diff --git a/arch/um/drivers/Makefile b/arch/um/drivers/Makefile index de17d4c6e0..634968150b 100644 --- a/arch/um/drivers/Makefile +++ b/arch/um/drivers/Makefile @@ -19,10 +19,16 @@ harddog-objs := harddog_kern.o harddog_user.o LDFLAGS_pcap.o := -r $(shell $(CC) $(CFLAGS) -print-file-name=libpcap.a) -targets := pcap_kern.o pcap_user.o +LDFLAGS_vde.o := -r $(shell $(CC) $(CFLAGS) -print-file-name=libvdeplug.a) + +targets := pcap_kern.o pcap_user.o vde_kern.o vde_user.o $(obj)/pcap.o: $(obj)/pcap_kern.o $(obj)/pcap_user.o $(LD) -r -dp -o $@ $^ $(LDFLAGS) $(LDFLAGS_pcap.o) + +$(obj)/vde.o: $(obj)/vde_kern.o $(obj)/vde_user.o + $(LD) -r -dp -o $@ $^ $(LDFLAGS) $(LDFLAGS_vde.o) + #XXX: The call below does not work because the flags are added before the # object name, so nothing from the library gets linked. #$(call if_changed,ld) @@ -37,6 +43,7 @@ obj-$(CONFIG_STDERR_CONSOLE) += stderr_console.o obj-$(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-$(CONFIG_UML_NET_PCAP) += pcap.o obj-$(CONFIG_UML_NET) += net.o @@ -54,6 +61,6 @@ obj-$(CONFIG_BLK_DEV_COW_COMMON) += cow_user.o obj-$(CONFIG_UML_RANDOM) += random.o # pcap_user.o must be added explicitly. -USER_OBJS := fd.o null.o pty.o tty.o xterm.o slip_common.o pcap_user.o +USER_OBJS := fd.o null.o pty.o tty.o xterm.o slip_common.o pcap_user.o vde_user.o include arch/um/scripts/Makefile.rules diff --git a/arch/um/drivers/vde.h b/arch/um/drivers/vde.h new file mode 100644 index 0000000000..fc3a05902b --- /dev/null +++ b/arch/um/drivers/vde.h @@ -0,0 +1,32 @@ +/* + * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org). + * Licensed under the GPL. + */ + +#ifndef __UM_VDE_H__ +#define __UM_VDE_H__ + +struct vde_data { + char *vde_switch; + char *descr; + void *args; + void *conn; + void *dev; +}; + +struct vde_init { + char *vde_switch; + char *descr; + int port; + char *group; + int mode; +}; + +extern const struct net_user_info vde_user_info; + +extern void vde_init_libstuff(struct vde_data *vpri, struct vde_init *init); + +extern int vde_user_read(void *conn, void *buf, int len); +extern int vde_user_write(void *conn, void *buf, int len); + +#endif diff --git a/arch/um/drivers/vde_kern.c b/arch/um/drivers/vde_kern.c new file mode 100644 index 0000000000..eb8cf31b82 --- /dev/null +++ b/arch/um/drivers/vde_kern.c @@ -0,0 +1,136 @@ +/* + * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org). + * Licensed under the GPL. + * + * Transport usage: + * ethN=vde,,,,,, + * + */ + +#include "linux/kernel.h" +#include "linux/init.h" +#include "linux/netdevice.h" +#include "linux/etherdevice.h" +#include "net_kern.h" +#include "net_user.h" +#include "vde.h" + +static void vde_init(struct net_device *dev, void *data) +{ + struct vde_init *init = data; + struct uml_net_private *pri; + struct vde_data *vpri; + + pri = dev->priv; + vpri = (struct vde_data *) pri->user; + + vpri->vde_switch = init->vde_switch; + vpri->descr = init->descr ? init->descr : "UML vde_transport"; + vpri->args = NULL; + vpri->conn = NULL; + vpri->dev = dev; + + printk(KERN_INFO "vde backend - %s, ", vpri->vde_switch ? + vpri->vde_switch : "(default socket)"); + + vde_init_libstuff(vpri, init); + + printk(KERN_INFO "\n"); +} + +static int vde_read(int fd, struct sk_buff **skb, struct uml_net_private *lp) +{ + struct vde_data *pri = (struct vde_data *) &lp->user; + + if (pri->conn != NULL) { + *skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER); + if (*skb == NULL) + return -ENOMEM; + + return vde_user_read(pri->conn, skb_mac_header(*skb), + (*skb)->dev->mtu + ETH_HEADER_OTHER); + } + + printk(KERN_ERR "vde_read - we have no VDECONN to read from"); + return -EBADF; +} + +static int vde_write(int fd, struct sk_buff **skb, struct uml_net_private *lp) +{ + struct vde_data *pri = (struct vde_data *) &lp->user; + + if (pri->conn != NULL) + return vde_user_write((void *)pri->conn, (*skb)->data, + (*skb)->len); + + printk(KERN_ERR "vde_write - we have no VDECONN to write to"); + return -EBADF; +} + +static const struct net_kern_info vde_kern_info = { + .init = vde_init, + .protocol = eth_protocol, + .read = vde_read, + .write = vde_write, +}; + +static int vde_setup(char *str, char **mac_out, void *data) +{ + struct vde_init *init = data; + char *remain, *port_str = NULL, *mode_str = NULL, *last; + + *init = ((struct vde_init) + { .vde_switch = NULL, + .descr = NULL, + .port = 0, + .group = NULL, + .mode = 0 }); + + remain = split_if_spec(str, &init->vde_switch, mac_out, &port_str, + &init->group, &mode_str, &init->descr, NULL); + + if (remain != NULL) + printk(KERN_WARNING "vde_setup - Ignoring extra data :" + "'%s'\n", remain); + + if (port_str != NULL) { + init->port = simple_strtoul(port_str, &last, 10); + if ((*last != '\0') || (last == port_str)) { + printk(KERN_ERR "vde_setup - Bad port : '%s'\n", + port_str); + return 0; + } + } + + if (mode_str != NULL) { + init->mode = simple_strtoul(mode_str, &last, 8); + if ((*last != '\0') || (last == mode_str)) { + printk(KERN_ERR "vde_setup - Bad mode : '%s'\n", + mode_str); + return 0; + } + } + + printk(KERN_INFO "Configured vde device: %s\n", init->vde_switch ? + init->vde_switch : "(default socket)"); + + return 1; +} + +static struct transport vde_transport = { + .list = LIST_HEAD_INIT(vde_transport.list), + .name = "vde", + .setup = vde_setup, + .user = &vde_user_info, + .kern = &vde_kern_info, + .private_size = sizeof(struct vde_data), + .setup_size = sizeof(struct vde_init), +}; + +static int register_vde(void) +{ + register_transport(&vde_transport); + return 0; +} + +late_initcall(register_vde); diff --git a/arch/um/drivers/vde_user.c b/arch/um/drivers/vde_user.c new file mode 100644 index 0000000000..d3b5a065fc --- /dev/null +++ b/arch/um/drivers/vde_user.c @@ -0,0 +1,136 @@ +/* + * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org). + * Licensed under the GPL. + */ + +#include +#include +#include +#include "net_user.h" +#include "kern_util.h" +#include "kern_constants.h" +#include "user.h" +#include "os.h" +#include "um_malloc.h" +#include "vde.h" + +#define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER) + +static int vde_user_init(void *data, void *dev) +{ + struct vde_data *pri = data; + VDECONN *conn = NULL; + int err = -EINVAL; + + pri->dev = dev; + + conn = vde_open(pri->vde_switch, pri->descr, pri->args); + + if (conn == NULL) { + err = -errno; + printk(UM_KERN_ERR "vde_user_init: vde_open failed, " + "errno = %d\n", errno); + return err; + } + + printk(UM_KERN_INFO "vde backend - connection opened\n"); + + pri->conn = conn; + + return 0; +} + +static int vde_user_open(void *data) +{ + struct vde_data *pri = data; + + if (pri->conn != NULL) + return vde_datafd(pri->conn); + + printk(UM_KERN_WARNING "vde_open - we have no VDECONN to open"); + return -EINVAL; +} + +static void vde_remove(void *data) +{ + struct vde_data *pri = data; + + if (pri->conn != NULL) { + printk(UM_KERN_INFO "vde backend - closing connection\n"); + vde_close(pri->conn); + pri->conn = NULL; + kfree(pri->args); + pri->args = NULL; + return; + } + + printk(UM_KERN_WARNING "vde_remove - we have no VDECONN to remove"); +} + +static int vde_set_mtu(int mtu, void *data) +{ + return mtu; +} + +const struct net_user_info vde_user_info = { + .init = vde_user_init, + .open = vde_user_open, + .close = NULL, + .remove = vde_remove, + .set_mtu = vde_set_mtu, + .add_address = NULL, + .delete_address = NULL, + .max_packet = MAX_PACKET - ETH_HEADER_OTHER +}; + +void vde_init_libstuff(struct vde_data *vpri, struct vde_init *init) +{ + struct vde_open_args *args; + + vpri->args = kmalloc(sizeof(struct vde_open_args), UM_GFP_KERNEL); + if (vpri->args == NULL) { + printk(UM_KERN_ERR "vde_init_libstuff - vde_open_args" + "allocation failed"); + return; + } + + args = vpri->args; + + args->port = init->port; + args->group = init->group; + args->mode = init->mode ? init->mode : 0700; + + args->port ? printk(UM_KERN_INFO "port %d", args->port) : + printk(UM_KERN_INFO "undefined port"); +} + +int vde_user_read(void *conn, void *buf, int len) +{ + VDECONN *vconn = conn; + int rv; + + if (vconn == NULL) + return 0; + + rv = vde_recv(vconn, buf, len, 0); + if (rv < 0) { + if (errno == EAGAIN) + return 0; + return -errno; + } + else if (rv == 0) + return -ENOTCONN; + + return rv; +} + +int vde_user_write(void *conn, void *buf, int len) +{ + VDECONN *vconn = conn; + + if (vconn == NULL) + return 0; + + return vde_send(vconn, buf, len, 0); +} +