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>
113 lines
2.5 KiB
C
113 lines
2.5 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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#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 "pcap_user.h"
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struct pcap_init {
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char *host_if;
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int promisc;
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int optimize;
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char *filter;
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};
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void pcap_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 pcap_data *ppri;
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struct pcap_init *init = data;
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pri = dev->priv;
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ppri = (struct pcap_data *) pri->user;
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ppri->host_if = init->host_if;
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ppri->promisc = init->promisc;
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ppri->optimize = init->optimize;
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ppri->filter = init->filter;
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printk("pcap backend, host interface %s\n", ppri->host_if);
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}
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static int pcap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
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{
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return pcap_user_read(fd, skb_mac_header(skb),
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skb->dev->mtu + ETH_HEADER_OTHER,
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(struct pcap_data *) &lp->user);
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}
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static int pcap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
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{
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return -EPERM;
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}
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static const struct net_kern_info pcap_kern_info = {
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.init = pcap_init,
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.protocol = eth_protocol,
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.read = pcap_read,
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.write = pcap_write,
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};
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int pcap_setup(char *str, char **mac_out, void *data)
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{
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struct pcap_init *init = data;
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char *remain, *host_if = NULL, *options[2] = { NULL, NULL };
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int i;
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*init = ((struct pcap_init)
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{ .host_if = "eth0",
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.promisc = 1,
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.optimize = 0,
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.filter = NULL });
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remain = split_if_spec(str, &host_if, &init->filter,
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&options[0], &options[1], mac_out, NULL);
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if (remain != NULL) {
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printk(KERN_ERR "pcap_setup - Extra garbage on "
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"specification : '%s'\n", remain);
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return 0;
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}
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if (host_if != NULL)
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init->host_if = host_if;
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for (i = 0; i < ARRAY_SIZE(options); i++) {
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if (options[i] == NULL)
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continue;
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if (!strcmp(options[i], "promisc"))
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init->promisc = 1;
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else if (!strcmp(options[i], "nopromisc"))
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init->promisc = 0;
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else if (!strcmp(options[i], "optimize"))
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init->optimize = 1;
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else if (!strcmp(options[i], "nooptimize"))
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init->optimize = 0;
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else {
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printk(KERN_ERR "pcap_setup : bad option - '%s'\n",
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options[i]);
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return 0;
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}
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}
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return 1;
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}
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static struct transport pcap_transport = {
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.list = LIST_HEAD_INIT(pcap_transport.list),
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.name = "pcap",
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.setup = pcap_setup,
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.user = &pcap_user_info,
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.kern = &pcap_kern_info,
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.private_size = sizeof(struct pcap_data),
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.setup_size = sizeof(struct pcap_init),
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};
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static int register_pcap(void)
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{
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register_transport(&pcap_transport);
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return 0;
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}
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late_initcall(register_pcap);
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