android_kernel_motorola_sm6225/arch/um/include/net_kern.h
Jeff Dike b53f35a809 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: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 09:43:08 -07:00

70 lines
1.9 KiB
C

/*
* Copyright (C) 2002 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
#ifndef __UM_NET_KERN_H
#define __UM_NET_KERN_H
#include <linux/netdevice.h>
#include <linux/platform_device.h>
#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/list.h>
#include <linux/workqueue.h>
struct uml_net {
struct list_head list;
struct net_device *dev;
struct platform_device pdev;
int index;
unsigned char mac[ETH_ALEN];
};
struct uml_net_private {
struct list_head list;
spinlock_t lock;
struct net_device *dev;
struct timer_list tl;
struct net_device_stats stats;
struct work_struct work;
int fd;
unsigned char mac[ETH_ALEN];
int max_packet;
unsigned short (*protocol)(struct sk_buff *);
int (*open)(void *);
void (*close)(int, void *);
void (*remove)(void *);
int (*read)(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 (*delete_address)(unsigned char *, unsigned char *, void *);
char user[0];
};
struct net_kern_info {
void (*init)(struct net_device *, void *);
unsigned short (*protocol)(struct sk_buff *);
int (*read)(int, struct sk_buff *skb, struct uml_net_private *);
int (*write)(int, struct sk_buff *skb, struct uml_net_private *);
};
struct transport {
struct list_head list;
const char *name;
int (* const setup)(char *, char **, void *);
const struct net_user_info *user;
const struct net_kern_info *kern;
const int private_size;
const int setup_size;
};
extern struct net_device *ether_init(int);
extern unsigned short ether_protocol(struct sk_buff *);
extern int tap_setup_common(char *str, char *type, char **dev_name,
char **mac_out, char **gate_addr);
extern void register_transport(struct transport *new);
extern unsigned short eth_protocol(struct sk_buff *skb);
#endif