+++ /dev/null
-/* Shared library add-on to iptables to add customized REJECT support.
- *
- * (C) 2000 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
- */
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <getopt.h>
-#include <iptables.h>
-#include <linux/netfilter_ipv4/ip_tables.h>
-#include <linux/netfilter_ipv4/ipt_REJECT.h>
-#include <linux/version.h>
-
-/* If we are compiling against a kernel that does not support
- * IPT_ICMP_ADMIN_PROHIBITED, we are emulating it.
- * The result will be a plain DROP of the packet instead of
- * reject. -- Maciej Soltysiak <solt@dns.toxicfilms.tv>
- */
-#ifndef IPT_ICMP_ADMIN_PROHIBITED
-#define IPT_ICMP_ADMIN_PROHIBITED IPT_TCP_RESET + 1
-#endif
-
-struct reject_names {
- const char *name;
- const char *alias;
- enum ipt_reject_with with;
- const char *desc;
-};
-
-static const struct reject_names reject_table[] = {
- {"icmp-net-unreachable", "net-unreach",
- IPT_ICMP_NET_UNREACHABLE, "ICMP network unreachable"},
- {"icmp-host-unreachable", "host-unreach",
- IPT_ICMP_HOST_UNREACHABLE, "ICMP host unreachable"},
- {"icmp-proto-unreachable", "proto-unreach",
- IPT_ICMP_PROT_UNREACHABLE, "ICMP protocol unreachable"},
- {"icmp-port-unreachable", "port-unreach",
- IPT_ICMP_PORT_UNREACHABLE, "ICMP port unreachable (default)"},
-#if 0
- {"echo-reply", "echoreply",
- IPT_ICMP_ECHOREPLY, "for ICMP echo only: faked ICMP echo reply"},
-#endif
- {"icmp-net-prohibited", "net-prohib",
- IPT_ICMP_NET_PROHIBITED, "ICMP network prohibited"},
- {"icmp-host-prohibited", "host-prohib",
- IPT_ICMP_HOST_PROHIBITED, "ICMP host prohibited"},
- {"tcp-reset", "tcp-rst",
- IPT_TCP_RESET, "TCP RST packet"},
- {"icmp-admin-prohibited", "admin-prohib",
- IPT_ICMP_ADMIN_PROHIBITED, "ICMP administratively prohibited (*)"}
-};
-
-static void
-print_reject_types(void)
-{
- unsigned int i;
-
- printf("Valid reject types:\n");
-
- for (i = 0; i < sizeof(reject_table)/sizeof(struct reject_names); i++) {
- printf(" %-25s\t%s\n", reject_table[i].name, reject_table[i].desc);
- printf(" %-25s\talias\n", reject_table[i].alias);
- }
- printf("\n");
-}
-
-/* Saves the union ipt_targinfo in parsable form to stdout. */
-
-/* Function which prints out usage message. */
-static void REJECT_help(void)
-{
- printf(
-"REJECT target options:\n"
-"--reject-with type drop input packet and send back\n"
-" a reply packet according to type:\n");
-
- print_reject_types();
-
- printf("(*) See man page or read the INCOMPATIBILITES file for compatibility issues.\n");
-}
-
-static const struct option REJECT_opts[] = {
- { "reject-with", 1, NULL, '1' },
- { .name = NULL }
-};
-
-/* Allocate and initialize the target. */
-static void REJECT_init(struct xt_entry_target *t)
-{
- struct ipt_reject_info *reject = (struct ipt_reject_info *)t->data;
-
- /* default */
- reject->with = IPT_ICMP_PORT_UNREACHABLE;
-
-}
-
-/* Function which parses command options; returns true if it
- ate an option */
-static int REJECT_parse(int c, char **argv, int invert, unsigned int *flags,
- const void *entry, struct xt_entry_target **target)
-{
- struct ipt_reject_info *reject = (struct ipt_reject_info *)(*target)->data;
- unsigned int limit = sizeof(reject_table)/sizeof(struct reject_names);
- unsigned int i;
-
- switch(c) {
- case '1':
- if (check_inverse(optarg, &invert, NULL, 0))
- exit_error(PARAMETER_PROBLEM,
- "Unexpected `!' after --reject-with");
- for (i = 0; i < limit; i++) {
- if ((strncasecmp(reject_table[i].name, optarg, strlen(optarg)) == 0)
- || (strncasecmp(reject_table[i].alias, optarg, strlen(optarg)) == 0)) {
- reject->with = reject_table[i].with;
- return 1;
- }
- }
- /* This due to be dropped late in 2.4 pre-release cycle --RR */
- if (strncasecmp("echo-reply", optarg, strlen(optarg)) == 0
- || strncasecmp("echoreply", optarg, strlen(optarg)) == 0)
- fprintf(stderr, "--reject-with echo-reply no longer"
- " supported\n");
- exit_error(PARAMETER_PROBLEM, "unknown reject type `%s'",optarg);
- default:
- /* Fall through */
- break;
- }
- return 0;
-}
-
-/* Prints out ipt_reject_info. */
-static void REJECT_print(const void *ip, const struct xt_entry_target *target,
- int numeric)
-{
- const struct ipt_reject_info *reject
- = (const struct ipt_reject_info *)target->data;
- unsigned int i;
-
- for (i = 0; i < sizeof(reject_table)/sizeof(struct reject_names); i++) {
- if (reject_table[i].with == reject->with)
- break;
- }
- printf("reject-with %s ", reject_table[i].name);
-}
-
-/* Saves ipt_reject in parsable form to stdout. */
-static void REJECT_save(const void *ip, const struct xt_entry_target *target)
-{
- const struct ipt_reject_info *reject
- = (const struct ipt_reject_info *)target->data;
- unsigned int i;
-
- for (i = 0; i < sizeof(reject_table)/sizeof(struct reject_names); i++)
- if (reject_table[i].with == reject->with)
- break;
-
- printf("--reject-with %s ", reject_table[i].name);
-}
-
-static struct xtables_target reject_tg_reg = {
- .name = "REJECT",
- .version = XTABLES_VERSION,
- .family = PF_INET,
- .size = XT_ALIGN(sizeof(struct ipt_reject_info)),
- .userspacesize = XT_ALIGN(sizeof(struct ipt_reject_info)),
- .help = REJECT_help,
- .init = REJECT_init,
- .parse = REJECT_parse,
- .print = REJECT_print,
- .save = REJECT_save,
- .extra_opts = REJECT_opts,
-};
-
-void _init(void)
-{
- xtables_register_target(&reject_tg_reg);
-}
git://git.onelab.eu / iptables.git / blobdiff