mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-19 09:59:04 +00:00
2e4e6a17af
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables. In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.
o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
are now implemented as xt_FOOBAR.c files and provide module aliases
to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
around the xt_FOOBAR.h headers
Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
/* Hop Limit matching module */
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/* (C) 2001-2002 Maciej Soltysiak <solt@dns.toxicfilms.tv>
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* Based on HW's ttl module
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/netfilter_ipv6/ip6t_hl.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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MODULE_AUTHOR("Maciej Soltysiak <solt@dns.toxicfilms.tv>");
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MODULE_DESCRIPTION("IP tables Hop Limit matching module");
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MODULE_LICENSE("GPL");
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static int match(const struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, const void *matchinfo,
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int offset, unsigned int protoff,
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int *hotdrop)
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{
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const struct ip6t_hl_info *info = matchinfo;
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const struct ipv6hdr *ip6h = skb->nh.ipv6h;
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switch (info->mode) {
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case IP6T_HL_EQ:
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return (ip6h->hop_limit == info->hop_limit);
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break;
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case IP6T_HL_NE:
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return (!(ip6h->hop_limit == info->hop_limit));
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break;
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case IP6T_HL_LT:
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return (ip6h->hop_limit < info->hop_limit);
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break;
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case IP6T_HL_GT:
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return (ip6h->hop_limit > info->hop_limit);
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break;
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default:
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printk(KERN_WARNING "ip6t_hl: unknown mode %d\n",
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info->mode);
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return 0;
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}
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return 0;
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}
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static int checkentry(const char *tablename, const void *entry,
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void *matchinfo, unsigned int matchsize,
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unsigned int hook_mask)
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{
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if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_hl_info)))
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return 0;
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return 1;
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}
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static struct ip6t_match hl_match = {
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.name = "hl",
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.match = &match,
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.checkentry = &checkentry,
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.me = THIS_MODULE,
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};
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static int __init init(void)
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{
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return ip6t_register_match(&hl_match);
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}
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static void __exit fini(void)
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{
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ip6t_unregister_match(&hl_match);
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}
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module_init(init);
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module_exit(fini);
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