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>
95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/*
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* Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
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* James Leu (jleu@mindspring.net).
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Copyright (C) 2001 by various other people who didn't put their name here.
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* Licensed under the GPL.
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*/
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#include "linux/init.h"
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#include <linux/netdevice.h>
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#include "net_kern.h"
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#include "daemon.h"
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struct daemon_init {
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char *sock_type;
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char *ctl_sock;
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};
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static void daemon_init(struct net_device *dev, void *data)
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{
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struct uml_net_private *pri;
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struct daemon_data *dpri;
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struct daemon_init *init = data;
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pri = dev->priv;
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dpri = (struct daemon_data *) pri->user;
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dpri->sock_type = init->sock_type;
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dpri->ctl_sock = init->ctl_sock;
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dpri->fd = -1;
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dpri->control = -1;
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dpri->dev = dev;
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/* We will free this pointer. If it contains crap we're burned. */
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dpri->ctl_addr = NULL;
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dpri->data_addr = NULL;
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dpri->local_addr = NULL;
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printk("daemon backend (uml_switch version %d) - %s:%s",
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SWITCH_VERSION, dpri->sock_type, dpri->ctl_sock);
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printk("\n");
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}
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static int daemon_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
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{
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return net_recvfrom(fd, skb_mac_header(skb),
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skb->dev->mtu + ETH_HEADER_OTHER);
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}
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static int daemon_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
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{
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return daemon_user_write(fd, skb->data, skb->len,
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(struct daemon_data *) &lp->user);
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}
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static const struct net_kern_info daemon_kern_info = {
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.init = daemon_init,
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.protocol = eth_protocol,
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.read = daemon_read,
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.write = daemon_write,
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};
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static int daemon_setup(char *str, char **mac_out, void *data)
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{
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struct daemon_init *init = data;
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char *remain;
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*init = ((struct daemon_init)
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{ .sock_type = "unix",
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.ctl_sock = "/tmp/uml.ctl" });
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remain = split_if_spec(str, mac_out, &init->sock_type, &init->ctl_sock,
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NULL);
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if (remain != NULL)
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printk(KERN_WARNING "daemon_setup : Ignoring data socket "
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"specification\n");
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return 1;
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}
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static struct transport daemon_transport = {
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.list = LIST_HEAD_INIT(daemon_transport.list),
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.name = "daemon",
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.setup = daemon_setup,
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.user = &daemon_user_info,
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.kern = &daemon_kern_info,
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.private_size = sizeof(struct daemon_data),
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.setup_size = sizeof(struct daemon_init),
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};
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static int register_daemon(void)
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{
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register_transport(&daemon_transport);
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return 0;
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}
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late_initcall(register_daemon);
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