Commit b53f35a8 authored by Jeff Dike's avatar Jeff Dike Committed by Linus Torvalds

uml: network driver MTU cleanups

A bunch of MTU-related cleanups in the network code.

First, there is the addition of the notion of a maximally-sized packet, which
is the MTU plus headers.  This is used to size the skb that will receive a
packet.  This allows ether_adjust_skb to go away, as it was used to resize the
skb after it was allocated.

Since the skb passed into the low-level read routine is no longer resized, and
possibly reallocated, there, they (and the write routines) don't need to get
an sk_buff **.  They just need the sk_buff * now.  The callers of
ether_adjust_skb still need to do the skb_put, so that's now inlined.

The MAX_PACKET definitions in most of the drivers are gone.

The set_mtu methods were all the same and did nothing, so they can be
removed.

The ethertap driver had a typo which doubled the size of the packet rather
than adding two bytes to it.  It also wasn't defining its setup_size, causing
a zero-byte kmalloc and crash when the invalid pointer returned from kmalloc
was dereferenced.
Signed-off-by: default avatarJeff Dike <jdike@linux.intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent cd1ae0e4
...@@ -39,20 +39,15 @@ static void daemon_init(struct net_device *dev, void *data) ...@@ -39,20 +39,15 @@ static void daemon_init(struct net_device *dev, void *data)
printk("\n"); printk("\n");
} }
static int daemon_read(int fd, struct sk_buff **skb, static int daemon_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
struct uml_net_private *lp)
{ {
*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER); return net_recvfrom(fd, skb_mac_header(skb),
if (*skb == NULL) skb->dev->mtu + ETH_HEADER_OTHER);
return -ENOMEM;
return net_recvfrom(fd, skb_mac_header(*skb),
(*skb)->dev->mtu + ETH_HEADER_OTHER);
} }
static int daemon_write(int fd, struct sk_buff **skb, static int daemon_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
struct uml_net_private *lp)
{ {
return daemon_user_write(fd, (*skb)->data, (*skb)->len, return daemon_user_write(fd, skb->data, skb->len,
(struct daemon_data *) &lp->user); (struct daemon_data *) &lp->user);
} }
......
...@@ -19,8 +19,6 @@ ...@@ -19,8 +19,6 @@
#include "um_malloc.h" #include "um_malloc.h"
#include "user.h" #include "user.h"
#define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
enum request_type { REQ_NEW_CONTROL }; enum request_type { REQ_NEW_CONTROL };
#define SWITCH_MAGIC 0xfeedface #define SWITCH_MAGIC 0xfeedface
...@@ -184,18 +182,13 @@ int daemon_user_write(int fd, void *buf, int len, struct daemon_data *pri) ...@@ -184,18 +182,13 @@ int daemon_user_write(int fd, void *buf, int len, struct daemon_data *pri)
return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr)); return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr));
} }
static int daemon_set_mtu(int mtu, void *data)
{
return mtu;
}
const struct net_user_info daemon_user_info = { const struct net_user_info daemon_user_info = {
.init = daemon_user_init, .init = daemon_user_init,
.open = daemon_open, .open = daemon_open,
.close = NULL, .close = NULL,
.remove = daemon_remove, .remove = daemon_remove,
.set_mtu = daemon_set_mtu,
.add_address = NULL, .add_address = NULL,
.delete_address = NULL, .delete_address = NULL,
.max_packet = MAX_PACKET - ETH_HEADER_OTHER .mtu = ETH_MAX_PACKET,
.max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
}; };
...@@ -39,18 +39,15 @@ static void mcast_init(struct net_device *dev, void *data) ...@@ -39,18 +39,15 @@ static void mcast_init(struct net_device *dev, void *data)
dpri->addr, dpri->port, dpri->ttl); dpri->addr, dpri->port, dpri->ttl);
} }
static int mcast_read(int fd, struct sk_buff **skb, struct uml_net_private *lp) static int mcast_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{ {
*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER); return net_recvfrom(fd, skb_mac_header(skb),
if (*skb == NULL) skb->dev->mtu + ETH_HEADER_OTHER);
return -ENOMEM;
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) static int mcast_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{ {
return mcast_user_write(fd, (*skb)->data, (*skb)->len, return mcast_user_write(fd, skb->data, skb->len,
(struct mcast_data *) &lp->user); (struct mcast_data *) &lp->user);
} }
......
...@@ -20,8 +20,6 @@ ...@@ -20,8 +20,6 @@
#include "um_malloc.h" #include "um_malloc.h"
#include "user.h" #include "user.h"
#define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
static struct sockaddr_in *new_addr(char *addr, unsigned short port) static struct sockaddr_in *new_addr(char *addr, unsigned short port)
{ {
struct sockaddr_in *sin; struct sockaddr_in *sin;
...@@ -154,18 +152,13 @@ int mcast_user_write(int fd, void *buf, int len, struct mcast_data *pri) ...@@ -154,18 +152,13 @@ int mcast_user_write(int fd, void *buf, int len, struct mcast_data *pri)
return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr)); return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr));
} }
static int mcast_set_mtu(int mtu, void *data)
{
return mtu;
}
const struct net_user_info mcast_user_info = { const struct net_user_info mcast_user_info = {
.init = mcast_user_init, .init = mcast_user_init,
.open = mcast_open, .open = mcast_open,
.close = mcast_close, .close = mcast_close,
.remove = mcast_remove, .remove = mcast_remove,
.set_mtu = mcast_set_mtu,
.add_address = NULL, .add_address = NULL,
.delete_address = NULL, .delete_address = NULL,
.max_packet = MAX_PACKET - ETH_HEADER_OTHER .mtu = ETH_MAX_PACKET,
.max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
}; };
...@@ -41,16 +41,16 @@ static int uml_net_rx(struct net_device *dev) ...@@ -41,16 +41,16 @@ static int uml_net_rx(struct net_device *dev)
struct sk_buff *skb; struct sk_buff *skb;
/* If we can't allocate memory, try again next round. */ /* If we can't allocate memory, try again next round. */
skb = dev_alloc_skb(dev->mtu); skb = dev_alloc_skb(lp->max_packet);
if (skb == NULL) { if (skb == NULL) {
lp->stats.rx_dropped++; lp->stats.rx_dropped++;
return 0; return 0;
} }
skb->dev = dev; skb->dev = dev;
skb_put(skb, dev->mtu); skb_put(skb, lp->max_packet);
skb_reset_mac_header(skb); skb_reset_mac_header(skb);
pkt_len = (*lp->read)(lp->fd, &skb, lp); pkt_len = (*lp->read)(lp->fd, skb, lp);
if (pkt_len > 0) { if (pkt_len > 0) {
skb_trim(skb, pkt_len); skb_trim(skb, pkt_len);
...@@ -178,7 +178,7 @@ static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev) ...@@ -178,7 +178,7 @@ static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
spin_lock_irqsave(&lp->lock, flags); spin_lock_irqsave(&lp->lock, flags);
len = (*lp->write)(lp->fd, &skb, lp); len = (*lp->write)(lp->fd, skb, lp);
if (len == skb->len) { if (len == skb->len) {
lp->stats.tx_packets++; lp->stats.tx_packets++;
...@@ -240,22 +240,9 @@ static int uml_net_set_mac(struct net_device *dev, void *addr) ...@@ -240,22 +240,9 @@ static int uml_net_set_mac(struct net_device *dev, void *addr)
static int uml_net_change_mtu(struct net_device *dev, int new_mtu) static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
{ {
struct uml_net_private *lp = dev->priv;
int err = 0;
spin_lock_irq(&lp->lock);
new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
if (new_mtu < 0) {
err = new_mtu;
goto out;
}
dev->mtu = new_mtu; dev->mtu = new_mtu;
out: return 0;
spin_unlock_irq(&lp->lock);
return err;
} }
static void uml_net_get_drvinfo(struct net_device *dev, static void uml_net_get_drvinfo(struct net_device *dev,
...@@ -427,6 +414,7 @@ static void eth_configure(int n, void *init, char *mac, ...@@ -427,6 +414,7 @@ static void eth_configure(int n, void *init, char *mac,
.dev = dev, .dev = dev,
.fd = -1, .fd = -1,
.mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0}, .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
.max_packet = transport->user->max_packet,
.protocol = transport->kern->protocol, .protocol = transport->kern->protocol,
.open = transport->user->open, .open = transport->user->open,
.close = transport->user->close, .close = transport->user->close,
...@@ -434,8 +422,7 @@ static void eth_configure(int n, void *init, char *mac, ...@@ -434,8 +422,7 @@ static void eth_configure(int n, void *init, char *mac,
.read = transport->kern->read, .read = transport->kern->read,
.write = transport->kern->write, .write = transport->kern->write,
.add_address = transport->user->add_address, .add_address = transport->user->add_address,
.delete_address = transport->user->delete_address, .delete_address = transport->user->delete_address });
.set_mtu = transport->user->set_mtu });
init_timer(&lp->tl); init_timer(&lp->tl);
spin_lock_init(&lp->lock); spin_lock_init(&lp->lock);
...@@ -447,7 +434,7 @@ static void eth_configure(int n, void *init, char *mac, ...@@ -447,7 +434,7 @@ static void eth_configure(int n, void *init, char *mac,
goto out_unregister; goto out_unregister;
set_ether_mac(dev, device->mac); set_ether_mac(dev, device->mac);
dev->mtu = transport->user->max_packet; dev->mtu = transport->user->mtu;
dev->open = uml_net_open; dev->open = uml_net_open;
dev->hard_start_xmit = uml_net_start_xmit; dev->hard_start_xmit = uml_net_start_xmit;
dev->stop = uml_net_close; dev->stop = uml_net_close;
...@@ -807,19 +794,6 @@ static void close_devices(void) ...@@ -807,19 +794,6 @@ static void close_devices(void)
__uml_exitcall(close_devices); __uml_exitcall(close_devices);
struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
{
if ((skb != NULL) && (skb_tailroom(skb) < extra)) {
struct sk_buff *skb2;
skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
dev_kfree_skb(skb);
skb = skb2;
}
if (skb != NULL) skb_put(skb, extra);
return skb;
}
void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *, void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
void *), void *),
void *arg) void *arg)
......
...@@ -31,19 +31,14 @@ void pcap_init(struct net_device *dev, void *data) ...@@ -31,19 +31,14 @@ void pcap_init(struct net_device *dev, void *data)
printk("pcap backend, host interface %s\n", ppri->host_if); printk("pcap backend, host interface %s\n", ppri->host_if);
} }
static int pcap_read(int fd, struct sk_buff **skb, static int pcap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
struct uml_net_private *lp)
{ {
*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER); return pcap_user_read(fd, skb_mac_header(skb),
if (*skb == NULL) skb->dev->mtu + ETH_HEADER_OTHER,
return -ENOMEM;
return pcap_user_read(fd, skb_mac_header(*skb),
(*skb)->dev->mtu + ETH_HEADER_OTHER,
(struct pcap_data *) &lp->user); (struct pcap_data *) &lp->user);
} }
static int pcap_write(int fd, struct sk_buff **skb, struct uml_net_private *lp) static int pcap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{ {
return -EPERM; return -EPERM;
} }
......
...@@ -13,8 +13,6 @@ ...@@ -13,8 +13,6 @@
#include "um_malloc.h" #include "um_malloc.h"
#include "user.h" #include "user.h"
#define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
#define PCAP_FD(p) (*(int *)(p)) #define PCAP_FD(p) (*(int *)(p))
static int pcap_user_init(void *data, void *dev) static int pcap_user_init(void *data, void *dev)
...@@ -23,7 +21,8 @@ static int pcap_user_init(void *data, void *dev) ...@@ -23,7 +21,8 @@ static int pcap_user_init(void *data, void *dev)
pcap_t *p; pcap_t *p;
char errors[PCAP_ERRBUF_SIZE]; char errors[PCAP_ERRBUF_SIZE];
p = pcap_open_live(pri->host_if, MAX_PACKET, pri->promisc, 0, errors); p = pcap_open_live(pri->host_if, ETH_MAX_PACKET + ETH_HEADER_OTHER,
pri->promisc, 0, errors);
if (p == NULL) { if (p == NULL) {
printk(UM_KERN_ERR "pcap_user_init : pcap_open_live failed - " printk(UM_KERN_ERR "pcap_user_init : pcap_open_live failed - "
"'%s'\n", errors); "'%s'\n", errors);
...@@ -133,8 +132,8 @@ const struct net_user_info pcap_user_info = { ...@@ -133,8 +132,8 @@ const struct net_user_info pcap_user_info = {
.open = pcap_open, .open = pcap_open,
.close = NULL, .close = NULL,
.remove = pcap_remove, .remove = pcap_remove,
.set_mtu = NULL,
.add_address = NULL, .add_address = NULL,
.delete_address = NULL, .delete_address = NULL,
.max_packet = MAX_PACKET - ETH_HEADER_OTHER .mtu = ETH_MAX_PACKET,
.max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
}; };
...@@ -47,17 +47,15 @@ static unsigned short slip_protocol(struct sk_buff *skbuff) ...@@ -47,17 +47,15 @@ static unsigned short slip_protocol(struct sk_buff *skbuff)
return htons(ETH_P_IP); return htons(ETH_P_IP);
} }
static int slip_read(int fd, struct sk_buff **skb, static int slip_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
struct uml_net_private *lp)
{ {
return slip_user_read(fd, skb_mac_header(*skb), (*skb)->dev->mtu, return slip_user_read(fd, skb_mac_header(skb), skb->dev->mtu,
(struct slip_data *) &lp->user); (struct slip_data *) &lp->user);
} }
static int slip_write(int fd, struct sk_buff **skb, static int slip_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
struct uml_net_private *lp)
{ {
return slip_user_write(fd, (*skb)->data, (*skb)->len, return slip_user_write(fd, skb->data, skb->len,
(struct slip_data *) &lp->user); (struct slip_data *) &lp->user);
} }
......
...@@ -230,11 +230,6 @@ int slip_user_write(int fd, void *buf, int len, struct slip_data *pri) ...@@ -230,11 +230,6 @@ int slip_user_write(int fd, void *buf, int len, struct slip_data *pri)
return slip_proto_write(fd, buf, len, &pri->slip); return slip_proto_write(fd, buf, len, &pri->slip);
} }
static int slip_set_mtu(int mtu, void *data)
{
return mtu;
}
static void slip_add_addr(unsigned char *addr, unsigned char *netmask, static void slip_add_addr(unsigned char *addr, unsigned char *netmask,
void *data) void *data)
{ {
...@@ -260,8 +255,8 @@ const struct net_user_info slip_user_info = { ...@@ -260,8 +255,8 @@ const struct net_user_info slip_user_info = {
.open = slip_open, .open = slip_open,
.close = slip_close, .close = slip_close,
.remove = NULL, .remove = NULL,
.set_mtu = slip_set_mtu,
.add_address = slip_add_addr, .add_address = slip_add_addr,
.delete_address = slip_del_addr, .delete_address = slip_del_addr,
.max_packet = BUF_SIZE .mtu = BUF_SIZE,
.max_packet = BUF_SIZE,
}; };
...@@ -52,18 +52,16 @@ static unsigned short slirp_protocol(struct sk_buff *skbuff) ...@@ -52,18 +52,16 @@ static unsigned short slirp_protocol(struct sk_buff *skbuff)
return htons(ETH_P_IP); return htons(ETH_P_IP);
} }
static int slirp_read(int fd, struct sk_buff **skb, static int slirp_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
struct uml_net_private *lp)
{ {
return slirp_user_read(fd, skb_mac_header(*skb), (*skb)->dev->mtu, return slirp_user_read(fd, skb_mac_header(skb), skb->dev->mtu,
(struct slirp_data *) &lp->user); (struct slirp_data *) &lp->user);
} }
static int slirp_write(int fd, struct sk_buff **skb, static int slirp_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
struct uml_net_private *lp)
{ {
return slirp_user_write(fd, (*skb)->data, (*skb)->len, return slirp_user_write(fd, skb->data, skb->len,
(struct slirp_data *) &lp->user); (struct slirp_data *) &lp->user);
} }
const struct net_kern_info slirp_kern_info = { const struct net_kern_info slirp_kern_info = {
......
...@@ -124,18 +124,13 @@ int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri) ...@@ -124,18 +124,13 @@ int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri)
return slip_proto_write(fd, buf, len, &pri->slip); return slip_proto_write(fd, buf, len, &pri->slip);
} }
static int slirp_set_mtu(int mtu, void *data)
{
return mtu;
}
const struct net_user_info slirp_user_info = { const struct net_user_info slirp_user_info = {
.init = slirp_user_init, .init = slirp_user_init,
.open = slirp_open, .open = slirp_open,
.close = slirp_close, .close = slirp_close,
.remove = NULL, .remove = NULL,
.set_mtu = slirp_set_mtu,
.add_address = NULL, .add_address = NULL,
.delete_address = NULL, .delete_address = NULL,
.max_packet = BUF_SIZE .mtu = BUF_SIZE,
.max_packet = BUF_SIZE,
}; };
...@@ -36,30 +36,25 @@ static void vde_init(struct net_device *dev, void *data) ...@@ -36,30 +36,25 @@ static void vde_init(struct net_device *dev, void *data)
printk("\n"); printk("\n");
} }
static int vde_read(int fd, struct sk_buff **skb, struct uml_net_private *lp) static int vde_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{ {
struct vde_data *pri = (struct vde_data *) &lp->user; struct vde_data *pri = (struct vde_data *) &lp->user;
if (pri->conn != NULL) { if (pri->conn != NULL)
*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER); return vde_user_read(pri->conn, skb_mac_header(skb),
if (*skb == NULL) skb->dev->mtu + ETH_HEADER_OTHER);
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"); printk(KERN_ERR "vde_read - we have no VDECONN to read from");
return -EBADF; return -EBADF;
} }
static int vde_write(int fd, struct sk_buff **skb, struct uml_net_private *lp) static int vde_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{ {
struct vde_data *pri = (struct vde_data *) &lp->user; struct vde_data *pri = (struct vde_data *) &lp->user;
if (pri->conn != NULL) if (pri->conn != NULL)
return vde_user_write((void *)pri->conn, (*skb)->data, return vde_user_write((void *)pri->conn, skb->data,
(*skb)->len); skb->len);
printk(KERN_ERR "vde_write - we have no VDECONN to write to"); printk(KERN_ERR "vde_write - we have no VDECONN to write to");
return -EBADF; return -EBADF;
......
...@@ -12,8 +12,6 @@ ...@@ -12,8 +12,6 @@
#include "user.h" #include "user.h"
#include "vde.h" #include "vde.h"
#define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
static int vde_user_init(void *data, void *dev) static int vde_user_init(void *data, void *dev)
{ {
struct vde_data *pri = data; struct vde_data *pri = data;
...@@ -65,20 +63,15 @@ static void vde_remove(void *data) ...@@ -65,20 +63,15 @@ static void vde_remove(void *data)
printk(UM_KERN_WARNING "vde_remove - we have no VDECONN to remove"); 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 = { const struct net_user_info vde_user_info = {
.init = vde_user_init, .init = vde_user_init,
.open = vde_user_open, .open = vde_user_open,
.close = NULL, .close = NULL,
.remove = vde_remove, .remove = vde_remove,
.set_mtu = vde_set_mtu,
.add_address = NULL, .add_address = NULL,
.delete_address = NULL, .delete_address = NULL,
.max_packet = MAX_PACKET - ETH_HEADER_OTHER .mtu = ETH_MAX_PACKET,
.max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
}; };
void vde_init_libstuff(struct vde_data *vpri, struct vde_init *init) void vde_init_libstuff(struct vde_data *vpri, struct vde_init *init)
......
/* /*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com) * Copyright (C) 2002 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL * Licensed under the GPL
*/ */
...@@ -30,24 +30,24 @@ struct uml_net_private { ...@@ -30,24 +30,24 @@ struct uml_net_private {
struct work_struct work; struct work_struct work;
int fd; int fd;
unsigned char mac[ETH_ALEN]; unsigned char mac[ETH_ALEN];
int max_packet;
unsigned short (*protocol)(struct sk_buff *); unsigned short (*protocol)(struct sk_buff *);
int (*open)(void *); int (*open)(void *);
void (*close)(int, void *); void (*close)(int, void *);
void (*remove)(void *); void (*remove)(void *);
int (*read)(int, struct sk_buff **skb, struct uml_net_private *); int (*read)(int, struct sk_buff *skb, struct uml_net_private *);
int (*write)(int, struct sk_buff **skb, struct uml_net_private *); int (*write)(int, struct sk_buff *skb, struct uml_net_private *);
void (*add_address)(unsigned char *, unsigned char *, void *); void (*add_address)(unsigned char *, unsigned char *, void *);
void (*delete_address)(unsigned char *, unsigned char *, void *); void (*delete_address)(unsigned char *, unsigned char *, void *);
int (*set_mtu)(int mtu, void *);
char user[0]; char user[0];
}; };
struct net_kern_info { struct net_kern_info {
void (*init)(struct net_device *, void *); void (*init)(struct net_device *, void *);
unsigned short (*protocol)(struct sk_buff *); unsigned short (*protocol)(struct sk_buff *);
int (*read)(int, struct sk_buff **skb, struct uml_net_private *); int (*read)(int, struct sk_buff *skb, struct uml_net_private *);
int (*write)(int, struct sk_buff **skb, struct uml_net_private *); int (*write)(int, struct sk_buff *skb, struct uml_net_private *);
}; };
struct transport { struct transport {
...@@ -62,7 +62,6 @@ struct transport { ...@@ -62,7 +62,6 @@ struct transport {
extern struct net_device *ether_init(int); extern struct net_device *ether_init(int);
extern unsigned short ether_protocol(struct sk_buff *); extern unsigned short ether_protocol(struct sk_buff *);
extern struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra);
extern int tap_setup_common(char *str, char *type, char **dev_name, extern int tap_setup_common(char *str, char *type, char **dev_name,
char **mac_out, char **gate_addr); char **mac_out, char **gate_addr);
extern void register_transport(struct transport *new); extern void register_transport(struct transport *new);
......
/* /*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com) * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL * Licensed under the GPL
*/ */
...@@ -18,10 +18,10 @@ struct net_user_info { ...@@ -18,10 +18,10 @@ struct net_user_info {
int (*open)(void *); int (*open)(void *);
void (*close)(int, void *); void (*close)(int, void *);
void (*remove)(void *); void (*remove)(void *);
int (*set_mtu)(int mtu, void *);
void (*add_address)(unsigned char *, unsigned char *, void *); void (*add_address)(unsigned char *, unsigned char *, void *);
void (*delete_address)(unsigned char *, unsigned char *, void *); void (*delete_address)(unsigned char *, unsigned char *, void *);
int max_packet; int max_packet;
int mtu;
}; };
extern void ether_user_init(void *data, void *dev); extern void ether_user_init(void *data, void *dev);
......
...@@ -36,35 +36,24 @@ static void etap_init(struct net_device *dev, void *data) ...@@ -36,35 +36,24 @@ static void etap_init(struct net_device *dev, void *data)
printk("\n"); printk("\n");
} }
static int etap_read(int fd, struct sk_buff **skb, struct uml_net_private *lp) static int etap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{ {
int len; int len;
*skb = ether_adjust_skb(*skb, ETH_HEADER_ETHERTAP); len = net_recvfrom(fd, skb_mac_header(skb),
if (*skb == NULL) skb->dev->mtu + 2 + ETH_HEADER_ETHERTAP);
return -ENOMEM;
len = net_recvfrom(fd, skb_mac_header(*skb),
(*skb)->dev->mtu + 2 * ETH_HEADER_ETHERTAP);
if (len <= 0) if (len <= 0)
return len; return(len);
skb_pull(*skb, 2);
skb_pull(skb, 2);
len -= 2; len -= 2;
return len; return len;
} }
static int etap_write(int fd, struct sk_buff **skb, struct uml_net_private *lp) static int etap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{ {
if (skb_headroom(*skb) < 2) { skb_push(skb, 2);
struct sk_buff *skb2; return net_send(fd, skb->data, skb->len);
skb2 = skb_realloc_headroom(*skb, 2);
dev_kfree_skb(*skb);
if (skb2 == NULL)
return -ENOMEM;
*skb = skb2;
}
skb_push(*skb, 2);
return net_send(fd, (*skb)->data, (*skb)->len);
} }
const struct net_kern_info ethertap_kern_info = { const struct net_kern_info ethertap_kern_info = {
...@@ -99,6 +88,7 @@ static struct transport ethertap_transport = { ...@@ -99,6 +88,7 @@ static struct transport ethertap_transport = {
.user = &ethertap_user_info, .user = &ethertap_user_info,
.kern = &ethertap_kern_info, .kern = &ethertap_kern_info,
.private_size = sizeof(struct ethertap_data), .private_size = sizeof(struct ethertap_data),
.setup_size = sizeof(struct ethertap_init),
}; };
static int register_ethertap(void) static int register_ethertap(void)
......
...@@ -222,11 +222,6 @@ static void etap_close(int fd, void *data) ...@@ -222,11 +222,6 @@ static void etap_close(int fd, void *data)
pri->control_fd = -1; pri->control_fd = -1;
} }
static int etap_set_mtu(int mtu, void *data)
{
return mtu;
}
static void etap_add_addr(unsigned char *addr, unsigned char *netmask, static void etap_add_addr(unsigned char *addr, unsigned char *netmask,
void *data) void *data)
{ {
...@@ -254,8 +249,8 @@ const struct net_user_info ethertap_user_info = { ...@@ -254,8 +249,8 @@ const struct net_user_info ethertap_user_info = {
.open = etap_open, .open = etap_open,
.close = etap_close, .close = etap_close,
.remove = NULL, .remove = NULL,
.set_mtu = etap_set_mtu,
.add_address = etap_add_addr, .add_address = etap_add_addr,
.delete_address = etap_del_addr, .delete_address = etap_del_addr,
.max_packet = MAX_PACKET - ETH_HEADER_ETHERTAP .mtu = ETH_MAX_PACKET,
.max_packet = ETH_MAX_PACKET + ETH_HEADER_ETHERTAP,
}; };
...@@ -35,20 +35,15 @@ static void tuntap_init(struct net_device *dev, void *data) ...@@ -35,20 +35,15 @@ static void tuntap_init(struct net_device *dev, void *data)
printk("\n"); printk("\n");
} }
static int tuntap_read(int fd, struct sk_buff **skb, static int tuntap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
struct uml_net_private *lp)
{ {
*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER); return net_read(fd, skb_mac_header(skb),
if (*skb == NULL) skb->dev->mtu + ETH_HEADER_OTHER);
return -ENOMEM;
return net_read(fd, skb_mac_header(*skb),
(*skb)->dev->mtu + ETH_HEADER_OTHER);
} }
static int tuntap_write(int fd, struct sk_buff **skb, static int tuntap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
struct uml_net_private *lp)
{ {
return net_write(fd, (*skb)->data, (*skb)->len); return net_write(fd, skb->data, skb->len);
} }
const struct net_kern_info tuntap_kern_info = { const struct net_kern_info tuntap_kern_info = {
......
...@@ -18,8 +18,6 @@ ...@@ -18,8 +18,6 @@
#include "tuntap.h" #include "tuntap.h"
#include "user.h" #include "user.h"
#define MAX_PACKET ETH_MAX_PACKET
static int tuntap_user_init(void *data, void *dev) static int tuntap_user_init(void *data, void *dev)
{ {
struct tuntap_data *pri = data; struct tuntap_data *pri = data;
...@@ -206,18 +204,13 @@ static void tuntap_close(int fd, void *data) ...@@ -206,18 +204,13 @@ static void tuntap_close(int fd, void *data)
pri->fd = -1; pri->fd = -1;
} }
static int tuntap_set_mtu(int mtu, void *data)
{
return mtu;
}
const struct net_user_info tuntap_user_info = { const struct net_user_info tuntap_user_info = {
.init = tuntap_user_init, .init = tuntap_user_init,
.open = tuntap_open, .open = tuntap_open,
.close = tuntap_close, .close = tuntap_close,
.remove = NULL, .remove = NULL,
.set_mtu = tuntap_set_mtu,
.add_address = tuntap_add_addr, .add_address = tuntap_add_addr,
.delete_address = tuntap_del_addr, .delete_address = tuntap_del_addr,
.max_packet = MAX_PACKET .mtu = ETH_MAX_PACKET,
.max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
}; };
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