Home | History | Annotate | Download | only in extensions 
      1 #include <stdio.h>
      2 #include <xtables.h>
      3 #include <linux/netfilter/xt_esp.h>
      4 
      5 enum {
      6 	O_ESPSPI = 0,
      7 };
      8 
      9 static void esp_help(void)
     10 {
     11 	printf(
     12 "esp match options:\n"
     13 "[!] --espspi spi[:spi]\n"
     14 "				match spi (range)\n");
     15 }
     16 
     17 static const struct xt_option_entry esp_opts[] = {
     18 	{.name = "espspi", .id = O_ESPSPI, .type = XTTYPE_UINT32RC,
     19 	 .flags = XTOPT_INVERT | XTOPT_PUT,
     20 	 XTOPT_POINTER(struct xt_esp, spis)},
     21 	XTOPT_TABLEEND,
     22 };
     23 
     24 static void esp_init(struct xt_entry_match *m)
     25 {
     26 	struct xt_esp *espinfo = (void *)m->data;
     27 
     28 	espinfo->spis[1] = ~0U;
     29 }
     30 
     31 static void esp_parse(struct xt_option_call *cb)
     32 {
     33 	struct xt_esp *espinfo = cb->data;
     34 
     35 	xtables_option_parse(cb);
     36 	if (cb->nvals == 1)
     37 		espinfo->spis[1] = espinfo->spis[0];
     38 	if (cb->invert)
     39 		espinfo->invflags |= XT_ESP_INV_SPI;
     40 }
     41 
     42 static void
     43 print_spis(const char *name, uint32_t min, uint32_t max,
     44 	    int invert)
     45 {
     46 	const char *inv = invert ? "!" : "";
     47 
     48 	if (min != 0 || max != 0xFFFFFFFF || invert) {
     49 		if (min == max)
     50 			printf(" %s:%s%u", name, inv, min);
     51 		else
     52 			printf(" %ss:%s%u:%u", name, inv, min, max);
     53 	}
     54 }
     55 
     56 static void
     57 esp_print(const void *ip, const struct xt_entry_match *match, int numeric)
     58 {
     59 	const struct xt_esp *esp = (struct xt_esp *)match->data;
     60 
     61 	printf(" esp");
     62 	print_spis("spi", esp->spis[0], esp->spis[1],
     63 		    esp->invflags & XT_ESP_INV_SPI);
     64 	if (esp->invflags & ~XT_ESP_INV_MASK)
     65 		printf(" Unknown invflags: 0x%X",
     66 		       esp->invflags & ~XT_ESP_INV_MASK);
     67 }
     68 
     69 static void esp_save(const void *ip, const struct xt_entry_match *match)
     70 {
     71 	const struct xt_esp *espinfo = (struct xt_esp *)match->data;
     72 
     73 	if (!(espinfo->spis[0] == 0
     74 	    && espinfo->spis[1] == 0xFFFFFFFF)) {
     75 		printf("%s --espspi ",
     76 			(espinfo->invflags & XT_ESP_INV_SPI) ? " !" : "");
     77 		if (espinfo->spis[0]
     78 		    != espinfo->spis[1])
     79 			printf("%u:%u",
     80 			       espinfo->spis[0],
     81 			       espinfo->spis[1]);
     82 		else
     83 			printf("%u",
     84 			       espinfo->spis[0]);
     85 	}
     86 
     87 }
     88 
     89 static int esp_xlate(struct xt_xlate *xl,
     90 		     const struct xt_xlate_mt_params *params)
     91 {
     92 	const struct xt_esp *espinfo = (struct xt_esp *)params->match->data;
     93 
     94 	if (!(espinfo->spis[0] == 0 && espinfo->spis[1] == 0xFFFFFFFF)) {
     95 		xt_xlate_add(xl, "esp spi%s",
     96 			   (espinfo->invflags & XT_ESP_INV_SPI) ? " !=" : "");
     97 		if (espinfo->spis[0] != espinfo->spis[1])
     98 			xt_xlate_add(xl, " %u-%u", espinfo->spis[0],
     99 				   espinfo->spis[1]);
    100 		else
    101 			xt_xlate_add(xl, " %u", espinfo->spis[0]);
    102 	}
    103 
    104 	return 1;
    105 }
    106 
    107 static struct xtables_match esp_match = {
    108 	.family		= NFPROTO_UNSPEC,
    109 	.name		= "esp",
    110 	.version	= XTABLES_VERSION,
    111 	.size		= XT_ALIGN(sizeof(struct xt_esp)),
    112 	.userspacesize	= XT_ALIGN(sizeof(struct xt_esp)),
    113 	.help		= esp_help,
    114 	.init		= esp_init,
    115 	.print		= esp_print,
    116 	.save		= esp_save,
    117 	.x6_parse	= esp_parse,
    118 	.x6_options	= esp_opts,
    119 	.xlate		= esp_xlate,
    120 };
    121 
    122 void
    123 _init(void)
    124 {
    125 	xtables_register_match(&esp_match);
    126 }
    127