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      1 /* ebt_mark_m
      2  *
      3  * Authors:
      4  * Bart De Schuymer <bdschuym (at) pandora.be>
      5  *
      6  * July, 2002
      7  *
      8  * Adapted by Arturo Borrero Gonzalez <arturo (at) debian.org>
      9  * to use libxtables for ebtables-compat in 2015.
     10  */
     11 
     12 #include <stdio.h>
     13 #include <stdlib.h>
     14 #include <string.h>
     15 #include <getopt.h>
     16 #include <xtables.h>
     17 #include <linux/netfilter_bridge/ebt_mark_m.h>
     18 
     19 #define MARK '1'
     20 
     21 static struct option brmark_m_opts[] = {
     22 	{ .name = "mark",	.has_arg = true, .val = MARK },
     23 	XT_GETOPT_TABLEEND,
     24 };
     25 
     26 static void brmark_m_print_help(void)
     27 {
     28 	printf(
     29 "mark option:\n"
     30 "--mark    [!] [value][/mask]: Match nfmask value (see man page)\n");
     31 }
     32 
     33 static void brmark_m_init(struct xt_entry_match *match)
     34 {
     35 	struct ebt_mark_m_info *info = (struct ebt_mark_m_info *)match->data;
     36 
     37 	info->mark = 0;
     38 	info->mask = 0;
     39 	info->invert = 0;
     40 	info->bitmask = 0;
     41 }
     42 
     43 #define OPT_MARK 0x01
     44 static int
     45 brmark_m_parse(int c, char **argv, int invert, unsigned int *flags,
     46 	       const void *entry, struct xt_entry_match **match)
     47 {
     48 	struct ebt_mark_m_info *info = (struct ebt_mark_m_info *)
     49 				       (*match)->data;
     50 	char *end;
     51 
     52 	switch (c) {
     53 	case MARK:
     54 		if (invert)
     55 			info->invert = 1;
     56 		info->mark = strtoul(optarg, &end, 0);
     57 		info->bitmask = EBT_MARK_AND;
     58 		if (*end == '/') {
     59 			if (end == optarg)
     60 				info->bitmask = EBT_MARK_OR;
     61 			info->mask = strtoul(end+1, &end, 0);
     62 		} else {
     63 			info->mask = 0xffffffff;
     64 		}
     65 		if (*end != '\0' || end == optarg)
     66 			xtables_error(PARAMETER_PROBLEM, "Bad mark value '%s'",
     67 				      optarg);
     68 		break;
     69 	default:
     70 		return 0;
     71 	}
     72 
     73 	*flags |= info->bitmask;
     74 	return 1;
     75 }
     76 
     77 static void brmark_m_final_check(unsigned int flags)
     78 {
     79 	if (!flags)
     80 		xtables_error(PARAMETER_PROBLEM,
     81 			      "You must specify proper arguments");
     82 }
     83 
     84 static void brmark_m_print(const void *ip, const struct xt_entry_match *match,
     85 			   int numeric)
     86 {
     87 	struct ebt_mark_m_info *info = (struct ebt_mark_m_info *)match->data;
     88 
     89 	printf("--mark ");
     90 	if (info->invert)
     91 		printf("! ");
     92 	if (info->bitmask == EBT_MARK_OR)
     93 		printf("/0x%lx ", info->mask);
     94 	else if (info->mask != 0xffffffff)
     95 		printf("0x%lx/0x%lx ", info->mark, info->mask);
     96 	else
     97 		printf("0x%lx ", info->mark);
     98 }
     99 
    100 static struct xtables_match brmark_m_match = {
    101 	.name		= "mark_m",
    102 	.revision	= 0,
    103 	.version	= XTABLES_VERSION,
    104 	.family		= NFPROTO_BRIDGE,
    105 	.size		= XT_ALIGN(sizeof(struct ebt_mark_m_info)),
    106 	.userspacesize	= XT_ALIGN(sizeof(struct ebt_mark_m_info)),
    107 	.init		= brmark_m_init,
    108 	.help		= brmark_m_print_help,
    109 	.parse		= brmark_m_parse,
    110 	.final_check	= brmark_m_final_check,
    111 	.print		= brmark_m_print,
    112 	.extra_opts	= brmark_m_opts,
    113 };
    114 
    115 void _init(void)
    116 {
    117 	xtables_register_match(&brmark_m_match);
    118 }
    119