mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 17:08:10 +00:00
b53f35a809
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>
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/*
|
|
* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#ifndef __UM_NET_USER_H__
|
|
#define __UM_NET_USER_H__
|
|
|
|
#define ETH_ADDR_LEN (6)
|
|
#define ETH_HEADER_ETHERTAP (16)
|
|
#define ETH_HEADER_OTHER (14)
|
|
#define ETH_MAX_PACKET (1500)
|
|
|
|
#define UML_NET_VERSION (4)
|
|
|
|
struct net_user_info {
|
|
int (*init)(void *, void *);
|
|
int (*open)(void *);
|
|
void (*close)(int, void *);
|
|
void (*remove)(void *);
|
|
void (*add_address)(unsigned char *, unsigned char *, void *);
|
|
void (*delete_address)(unsigned char *, unsigned char *, void *);
|
|
int max_packet;
|
|
int mtu;
|
|
};
|
|
|
|
extern void ether_user_init(void *data, void *dev);
|
|
extern void iter_addresses(void *d, void (*cb)(unsigned char *,
|
|
unsigned char *, void *),
|
|
void *arg);
|
|
|
|
extern void *get_output_buffer(int *len_out);
|
|
extern void free_output_buffer(void *buffer);
|
|
|
|
extern int tap_open_common(void *dev, char *gate_addr);
|
|
extern void tap_check_ips(char *gate_addr, unsigned char *eth_addr);
|
|
|
|
extern void read_output(int fd, char *output_out, int len);
|
|
|
|
extern int net_read(int fd, void *buf, int len);
|
|
extern int net_recvfrom(int fd, void *buf, int len);
|
|
extern int net_write(int fd, void *buf, int len);
|
|
extern int net_send(int fd, void *buf, int len);
|
|
extern int net_sendto(int fd, void *buf, int len, void *to, int sock_len);
|
|
|
|
extern void open_addr(unsigned char *addr, unsigned char *netmask, void *arg);
|
|
extern void close_addr(unsigned char *addr, unsigned char *netmask, void *arg);
|
|
|
|
extern char *split_if_spec(char *str, ...);
|
|
|
|
extern int dev_netmask(void *d, void *m);
|
|
|
|
#endif
|