| /* Shared library add-on to iptables for IPV4OPTSSTRIP |
| * This modules strip all the IP options. |
| * |
| * (C) 2001 by Fabrice MARIE <fabrice@netfilter.org> |
| * This program is distributed under the terms of GNU GPL v2, 1991 |
| */ |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <getopt.h> |
| |
| #include <iptables.h> |
| #include <linux/netfilter_ipv4/ip_tables.h> |
| |
| static void init(struct ipt_entry_target *t, unsigned int *nfcache) |
| { |
| *nfcache |= NFC_UNKNOWN; |
| } |
| |
| static void help(void) |
| { |
| printf("IPV4OPTSSTRIP v%s target takes no option !! Make sure you use it in the mangle table.\n", |
| IPTABLES_VERSION); |
| } |
| |
| static struct option opts[] = { |
| { 0 } |
| }; |
| |
| /* Function which parses command options; returns true if it |
| ate an option */ |
| static int |
| parse(int c, char **argv, int invert, unsigned int *flags, |
| const struct ipt_entry *entry, |
| struct ipt_entry_target **target) |
| { |
| return 0; |
| } |
| |
| static void |
| final_check(unsigned int flags) |
| { |
| } |
| |
| /* Prints out the targinfo. */ |
| static void |
| print(const struct ipt_ip *ip, |
| const struct ipt_entry_target *target, |
| int numeric) |
| { |
| /* nothing to print, we don't take option... */ |
| } |
| |
| /* Saves the stuff in parsable form to stdout. */ |
| static void |
| save(const struct ipt_ip *ip, const struct ipt_entry_target *target) |
| { |
| /* nothing to print, we don't take option... */ |
| } |
| |
| static |
| struct iptables_target IPV4OPTSSTRIP |
| = { NULL, |
| "IPV4OPTSSTRIP", |
| IPTABLES_VERSION, |
| IPT_ALIGN(0), |
| IPT_ALIGN(0), |
| &help, |
| &init, |
| &parse, |
| &final_check, |
| &print, |
| &save, |
| opts |
| }; |
| |
| void _init(void) |
| { |
| register_target(&IPV4OPTSSTRIP); |
| } |