+++ /dev/null
-/*
- * Shared library add-on to iptables to match
- * packets by their type (BROADCAST, UNICAST, MULTICAST).
- *
- * Michal Ludvig <michal@logix.cz>
- */
-#include <stdio.h>
-#include <netdb.h>
-#include <string.h>
-#include <stdlib.h>
-#include <getopt.h>
-#if defined(__GLIBC__) && __GLIBC__ == 2
-#include <net/ethernet.h>
-#else
-#include <linux/if_ether.h>
-#endif
-#include <xtables.h>
-#include <linux/if_packet.h>
-#include <linux/netfilter/xt_pkttype.h>
-
-#define PKTTYPE_VERSION "0.1"
-
-struct pkttypes {
- const char *name;
- unsigned char pkttype;
- unsigned char printhelp;
- const char *help;
-};
-
-static const struct pkttypes supported_types[] = {
- {"unicast", PACKET_HOST, 1, "to us"},
- {"broadcast", PACKET_BROADCAST, 1, "to all"},
- {"multicast", PACKET_MULTICAST, 1, "to group"},
-/*
- {"otherhost", PACKET_OTHERHOST, 1, "to someone else"},
- {"outgoing", PACKET_OUTGOING, 1, "outgoing of any type"},
-*/
- /* aliases */
- {"bcast", PACKET_BROADCAST, 0, NULL},
- {"mcast", PACKET_MULTICAST, 0, NULL},
- {"host", PACKET_HOST, 0, NULL}
-};
-
-static void print_types(void)
-{
- unsigned int i;
-
- printf("Valid packet types:\n");
- for (i = 0; i < sizeof(supported_types)/sizeof(struct pkttypes); i++)
- {
- if(supported_types[i].printhelp == 1)
- printf("\t%-14s\t\t%s\n", supported_types[i].name, supported_types[i].help);
- }
- printf("\n");
-}
-
-/* Function which prints out usage message. */
-static void pkttype_help(void)
-{
- printf(
-"pkttype match options:\n"
-"[!] --pkt-type packettype match packet type\n");
- print_types();
-}
-
-static const struct option pkttype_opts[] = {
- {"pkt-type", 1, NULL, '1'},
- { .name = NULL }
-};
-
-static void parse_pkttype(const char *pkttype, struct xt_pkttype_info *info)
-{
- unsigned int i;
-
- for (i = 0; i < sizeof(supported_types)/sizeof(struct pkttypes); i++)
- {
- if(strcasecmp(pkttype, supported_types[i].name)==0)
- {
- info->pkttype=supported_types[i].pkttype;
- return;
- }
- }
-
- exit_error(PARAMETER_PROBLEM, "Bad packet type '%s'", pkttype);
-}
-
-static int pkttype_parse(int c, char **argv, int invert, unsigned int *flags,
- const void *entry, struct xt_entry_match **match)
-{
- struct xt_pkttype_info *info = (struct xt_pkttype_info *)(*match)->data;
-
- switch(c)
- {
- case '1':
- check_inverse(optarg, &invert, &optind, 0);
- parse_pkttype(argv[optind-1], info);
- if(invert)
- info->invert=1;
- *flags=1;
- break;
-
- default:
- return 0;
- }
-
- return 1;
-}
-
-static void pkttype_check(unsigned int flags)
-{
- if (!flags)
- exit_error(PARAMETER_PROBLEM, "You must specify `--pkt-type'");
-}
-
-static void print_pkttype(struct xt_pkttype_info *info)
-{
- unsigned int i;
-
- for (i = 0; i < sizeof(supported_types)/sizeof(struct pkttypes); i++)
- {
- if(supported_types[i].pkttype==info->pkttype)
- {
- printf("%s ", supported_types[i].name);
- return;
- }
- }
-
- printf("%d ", info->pkttype); /* in case we didn't find an entry in named-packtes */
-}
-
-static void pkttype_print(const void *ip, const struct xt_entry_match *match,
- int numeric)
-{
- struct xt_pkttype_info *info = (struct xt_pkttype_info *)match->data;
-
- printf("PKTTYPE %s= ", info->invert?"!":"");
- print_pkttype(info);
-}
-
-static void pkttype_save(const void *ip, const struct xt_entry_match *match)
-{
- struct xt_pkttype_info *info = (struct xt_pkttype_info *)match->data;
-
- printf("--pkt-type %s", info->invert?"! ":"");
- print_pkttype(info);
-}
-
-static struct xtables_match pkttype_match = {
- .family = AF_UNSPEC,
- .name = "pkttype",
- .version = XTABLES_VERSION,
- .size = XT_ALIGN(sizeof(struct xt_pkttype_info)),
- .userspacesize = XT_ALIGN(sizeof(struct xt_pkttype_info)),
- .help = pkttype_help,
- .parse = pkttype_parse,
- .final_check = pkttype_check,
- .print = pkttype_print,
- .save = pkttype_save,
- .extra_opts = pkttype_opts,
-};
-
-void _init(void)
-{
- xtables_register_match(&pkttype_match);
-}