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38d179c8a3cefe25119fda7e44eecc5bfc7ff88e
xen/tools/vnet/vnet-module/vnet_dev.c
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/*
* Copyright (C) 2004 Mike Wray <mike.wray@hp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free software Foundation, Inc.,
* 59 Temple Place, suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/in.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <net/ip.h>
#include <net/protocol.h>
#include <linux/if_arp.h>
#include <linux/in6.h>
#include <linux/inetdevice.h>
#include <linux/arcdevice.h>
#include <linux/if_bridge.h>
#include <etherip.h>
#include <vnet.h>
#include <varp.h>
#include <vif.h>
#include <vnet_dev.h>
#define MODULE_NAME "VNET"
#define DEBUG 1
#undef DEBUG
#include "debug.h"
#define VNETIF_FMT "vnetif%u"
#define VNETBR_FMT "vnet%u"
#ifndef CONFIG_BRIDGE
#error Must configure ethernet bridging in Network Options
#endif
#include <linux/../../net/bridge/br_private.h>
#define dev_bridge(_dev) ((struct net_bridge *)(_dev)->priv)
static void vnet_dev_destructor(struct net_device *dev){
dprintf(">\n");
dev->open = NULL;
dev->stop = NULL;
dev->uninit = NULL;
dev->destructor = NULL;
dev->hard_start_xmit = NULL;
dev->get_stats = NULL;
dev->do_ioctl = NULL;
dev->change_mtu = NULL;
dev->tx_timeout = NULL;
dev->set_multicast_list = NULL;
dev->flags = 0;
dev->priv = NULL;
}
static void vnet_dev_uninit(struct net_device *dev){
//Vnet *vnet = dev->priv;
dprintf(">\n");
//dev_put(dev);
dprintf("<\n");
}
static struct net_device_stats *vnet_dev_get_stats(struct net_device *dev){
Vnet *vnet = dev->priv;
//dprintf(">\n");
return &vnet->stats;
}
static int vnet_dev_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd){
int err = 0;
dprintf(">\n");
return err;
}
static int vnet_dev_change_mtu(struct net_device *dev, int mtu){
int err = 0;
Vnet *vnet = dev->priv;
if (mtu < 68 || mtu > 1500 - vnet->header_n){
err = -EINVAL;
goto exit;
}
dev->mtu = mtu;
exit:
return err;
}
static int vnet_dev_set_name(struct net_device *dev){
int err = 0;
Vnet *vnet = (void*)dev->priv;
dprintf(">\n");
dprintf("> vnet=%d\n", vnet->vnet);
snprintf(dev->name, IFNAMSIZ - 1, VNETIF_FMT, vnet->vnet);
if(__dev_get_by_name(dev->name)){
err = -ENOMEM;
}
dprintf("< err=%d\n", err);
return err;
}
//============================================================================
#ifdef CONFIG_VNET_BRIDGE
#define BRIDGE DEVICE
void vnet_bridge_fini(Vnet *vnet){
if(!vnet) return;
if(vnet->bridge){
br_del_bridge(vnet->bridge->name);
vnet->bridge = NULL;
}
}
/** Create the bridge for a vnet, and add the
* vnet interface to it.
*
* @param vnet vnet
* @return 0 on success, error code otherwise
*/
int vnet_bridge_init(Vnet *vnet){
int err = 0;
char bridge[IFNAMSIZ] = {};
struct net_bridge *br;
vnet->bridge = NULL;
snprintf(bridge, IFNAMSIZ - 1, VNETBR_FMT, vnet->vnet);
rtnl_lock();
err = br_add_bridge(bridge);
rtnl_unlock();
if(err){
dprintf("> Error creating vnet bridge %s: err=%d\n", bridge, err);
goto exit;
}
vnet->bridge = __dev_get_by_name(bridge);
if(!vnet->bridge){
wprintf("> Vnet bridge %s is null!\n", bridge);
err = -EINVAL;
goto exit;
}
br = dev_bridge(vnet->bridge);
br->stp_enabled = 0;
br->bridge_hello_time = 0;
br->hello_time = 0;
br->bridge_forward_delay = 0;
br->forward_delay = 0;
rtnl_lock();
err = br_add_if(br, vnet->dev);
rtnl_unlock();
if(err){
dprintf("> Error adding vif %s to vnet bridge %s: err=%d\n",
vnet->dev->name, bridge, err);
goto exit;
}
rtnl_lock();
dev_open(vnet->dev);
dev_open(vnet->bridge);
rtnl_unlock();
exit:
if(err){
if(vnet->bridge){
rtnl_lock();
br_del_bridge(bridge);
rtnl_unlock();
vnet->bridge = NULL;
}
}
return err;
}
/** Add an interface to the bridge for a vnet.
*
* @param vnet vnet
* @param dev interface
* @return 0 on success, error code otherwise
*/
int vnet_add_if(Vnet *vnet, struct net_device *dev){
int err = 0;
struct net_device *brdev;
dprintf(">\n");
if(!vnet->bridge){
err = -EINVAL;
goto exit;
}
// Delete the interface from the default bridge.
// todo: Really want to delete it from any bridge it's in.
if(!vnet_get_device(BRIDGE, &brdev)){
rtnl_lock();
br_del_if(dev_bridge(brdev), dev);
rtnl_unlock();
}
dprintf("> br_add_if %s %s\n", vnet->bridge->name, dev->name);
rtnl_lock();
dev_open(dev);
dev_open(vnet->bridge);
err = br_add_if(dev_bridge(vnet->bridge), dev);
rtnl_unlock();
exit:
dprintf("< err=%d\n", err);
return err;
}
int vnet_del_if(Vnet *vnet, struct net_device *dev){
int err = 0;
dprintf(">\n");
if(!vnet->bridge){
err = -EINVAL;
goto exit;
}
rtnl_lock();
br_del_if(dev_bridge(vnet->bridge), dev);
rtnl_unlock();
exit:
dprintf("< err=%d\n", err);
return err;
}
/** Create the bridge and virtual interface for a vnet.
*
* @param info vnet
* @return 0 on success, error code otherwise
*/
int Vnet_create(Vnet *info){
int err = 0;
dprintf("> %u\n", info->vnet);
err = vnet_dev_add(info);
if(err) goto exit;
dprintf("> vnet_bridge_init\n");
err = vnet_bridge_init(info);
if(err) goto exit;
dprintf("> Vnet_add...\n");
err = Vnet_add(info);
exit:
if(err){
dprintf("> vnet_bridge_fini...\n");
vnet_bridge_fini(info);
}
dprintf("< err=%d\n", err);
return err;
}
/** Remove the net device for a vnet.
* Clears the dev field of the vnet.
* Safe to call if the vnet or its dev are null.
*
* @param vnet vnet
*/
void vnet_dev_remove(Vnet *vnet){
if(!vnet) return;
dprintf("> vnet=%u\n", vnet->vnet);
if(vnet->bridge){
dprintf("> br_del_bridge(%s)\n", vnet->bridge->name);
rtnl_lock();
br_del_bridge(vnet->bridge->name);
rtnl_unlock();
vnet->bridge = NULL;
}
if(vnet->dev){
//dev_put(vnet->dev);
dprintf("> unregister_netdev(%s)\n", vnet->dev->name);
unregister_netdev(vnet->dev);
vnet->dev = NULL;
}
dprintf("<\n");
}
//============================================================================
#else
//============================================================================
/** Create the virtual interface for a vnet.
*
* @param info vnet
* @return 0 on success, error code otherwise
*/
int Vnet_create(Vnet *info){
int err = 0;
dprintf("> %u\n", info->vnet);
err = vnet_dev_add(info);
if(err) goto exit;
dprintf("> Vnet_add...\n");
err = Vnet_add(info);
exit:
dprintf("< err=%d\n", err);
return err;
}
int vnet_add_if(Vnet *vnet, struct net_device *dev){
int err = -ENOSYS;
return err;
}
int vnet_del_if(Vnet *vnet, struct net_device *dev){
int err = 0;
return err;
}
/** Remove the net device for a vnet.
* Clears the dev field of the vnet.
* Safe to call if the vnet or its dev are null.
*
* @param vnet vnet
*/
void vnet_dev_remove(Vnet *vnet){
if(!vnet) return;
dprintf("> vnet=%u\n", vnet->vnet);
if(vnet->dev){
//dev_put(vnet->dev);
dprintf("> unregister_netdev(%s)\n", vnet->dev->name);
unregister_netdev(vnet->dev);
vnet->dev = NULL;
}
dprintf("<\n");
}
#endif
//============================================================================
static int vnet_dev_open(struct net_device *dev){
int err = 0;
dprintf(">\n");
netif_start_queue(dev);
dprintf("<\n");
return err;
}
static int vnet_dev_stop(struct net_device *dev){
int err = 0;
dprintf(">\n");
netif_stop_queue(dev);
dprintf("<\n");
return err;
}
static int vnet_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev){
int err = 0;
Vnet *vnet = dev->priv;
dprintf("> skb=%p\n", skb);
if(vnet->recursion++) {
vnet->stats.collisions++;
vnet->stats.tx_errors++;
wprintf("> recursion!\n");
dev_kfree_skb(skb);
goto exit;
}
if(!skb){
err = -EINVAL;
wprintf("> skb NULL!\n");
goto exit;
}
dprintf("> skb->data=%p skb->mac.raw=%p\n", skb->data, skb->mac.raw);
if(skb->mac.raw < skb->data || skb->mac.raw > skb->nh.raw){
wprintf("> skb mac duff!\n");
skb->mac.raw = skb->data;
}
//dev->trans_start = jiffies;
err = vnet_skb_send(skb, vnet->vnet);
if(err < 0){
vnet->stats.tx_errors++;
} else {
vnet->stats.tx_packets++;
vnet->stats.tx_bytes += skb->len;
}
exit:
vnet->recursion--;
dprintf("<\n");
return 0;
}
void vnet_dev_tx_timeout(struct net_device *dev){
dprintf(">\n");
//dev->trans_start = jiffies;
//netif_wake_queue(dev);
}
void vnet_dev_set_multicast_list(struct net_device *dev){
dprintf(">\n");
}
static int (*eth_hard_header)(struct sk_buff *skb,
struct net_device *dev, unsigned short type,
void *daddr, void *saddr, unsigned len) = NULL;
static int vnet_dev_hard_header(struct sk_buff *skb,
struct net_device *dev, unsigned short type,
void *daddr, void *saddr, unsigned len){
int err = 0;
dprintf("> skb=%p ethhdr=%p dev=%s len=%u\n",
skb, skb->mac.raw, dev->name, len);
if(saddr){
dprintf("> saddr=" MACFMT "\n", MAC6TUPLE((unsigned char*)saddr));
} else {
dprintf("> saddr=NULL\n");
}
if(daddr){
dprintf("> daddr=" MACFMT "\n", MAC6TUPLE((unsigned char*)daddr));
} else {
dprintf("> daddr=NULL\n");
}
err = eth_hard_header(skb, dev, type, daddr, saddr, len);
dprintf("> eth_hard_header=%d\n", err);
skb->mac.raw = skb->data;
dprintf("> src=" MACFMT " dst=" MACFMT "\n",
MAC6TUPLE(skb->mac.ethernet->h_source),
MAC6TUPLE(skb->mac.ethernet->h_dest));
dprintf("< err=%d\n", err);
return err;
}
void vnet_dev_mac(unsigned char *mac){
static unsigned val = 1;
struct net_device *dev;
if(vnet_get_device(DEVICE, &dev)){
mac[0] = 0xAA;
mac[1] = 0xFF;
mac[2] = (unsigned char)((val >> 24) & 0xff);
mac[3] = (unsigned char)((val >> 16) & 0xff);
mac[4] = (unsigned char)((val >> 8) & 0xff);
mac[5] = (unsigned char)((val ) & 0xff);
val++;
} else {
memcpy(mac, dev->dev_addr, ETH_ALEN);
dev_put(dev);
}
}
static int vnet_dev_init(struct net_device *dev){
int err = 0;
Vnet *vnet = (void*)dev->priv;
dprintf(">\n");
ether_setup(dev);
if(!eth_hard_header) eth_hard_header = dev->hard_header;
dev->hard_header = vnet_dev_hard_header;
dev->open = vnet_dev_open;
dev->stop = vnet_dev_stop;
dev->uninit = vnet_dev_uninit;
dev->destructor = vnet_dev_destructor;
dev->hard_start_xmit = vnet_dev_hard_start_xmit;
dev->get_stats = vnet_dev_get_stats;
dev->do_ioctl = vnet_dev_do_ioctl;
dev->change_mtu = vnet_dev_change_mtu;
dev->tx_timeout = vnet_dev_tx_timeout;
dev->watchdog_timeo = TX_TIMEOUT;
dev->set_multicast_list = vnet_dev_set_multicast_list;
dev->hard_header_len += vnet->header_n;
dev->mtu -= vnet->header_n;
vnet_dev_mac(dev->dev_addr);
dev->flags |= IFF_DEBUG;
dev->flags |= IFF_PROMISC;
dev->flags |= IFF_ALLMULTI;
dprintf("<\n");
return err;
}
/** Add the interface (net device) for a vnet.
* Sets the dev field of the vnet on success.
* Does nothing if the vif already has an interface.
*
* @param vif vif
* @return 0 on success, error code otherwise
*/
int vnet_dev_add(Vnet *vnet){
int err = 0;
struct net_device *dev = NULL;
dprintf("> vnet=%p\n", vnet);
if(vnet->dev) goto exit;
vnet->header_n = sizeof(struct iphdr) + sizeof(struct etheriphdr);
dev = kmalloc(sizeof(struct net_device), GFP_ATOMIC);
if(!dev){ err = -ENOMEM; goto exit; }
*dev = (struct net_device){};
dev->priv = vnet;
vnet->dev = dev;
err = vnet_dev_set_name(dev);
if(err) goto exit;
vnet_dev_init(dev);
dprintf("> name=%s, register_netdev...\n", dev->name);
err = register_netdev(dev);
dprintf("> register_netdev=%d\n", err);
if(err) goto exit;
rtnl_lock();
dev_open(dev);
rtnl_unlock();
//dev_hold(dev);
exit:
if(err){
if(dev) kfree(dev);
vnet->dev = NULL;
}
dprintf("< err=%d\n", err);
return err;
}
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