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