#define INET6
#define BUILD_MATCH
#define MODULE_DATATYPE struct ip6t_hl_info
#define MODULE_NAME "hl"
#define __USE_GNU
#include "../module_iface.h"
#include <string.h>
#include <stdio.h>
#include <linux/if_ether.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/netfilter_ipv6/ip6t_hl.h>
static void setup(void *myinfo, unsigned int *nfcache) {
*nfcache |= NFC_UNKNOWN;
}
static int parse_field(char *field, SV *value, void *myinfo,
unsigned int *nfcache, struct ip6t_entry *entry, int *flags) {
MODULE_DATATYPE *info = (void *)(*(MODULE_ENTRYTYPE **)myinfo)->data;
if(!strcmp(field, "hl-eq"))
info->mode = IP6T_HL_EQ;
else if(!strcmp(field, "hl-lt"))
info->mode = IP6T_HL_LT;
else if(!strcmp(field, "hl-gt"))
info->mode = IP6T_HL_GT;
else
return(FALSE);
if(*flags) {
SET_ERRSTR("%s: Only one of 'hl-eq', 'hl-lt', or 'hl-gt' allowed "
"for hl match", field);
return(FALSE);
}
*flags = 1;
if(SvIOK(value))
info->hop_limit = SvIV(value);
else if(SvPOK(value)) {
char *text, *extent, *base, *temp;
int val;
STRLEN len;
temp = SvPV(value, len);
base = text = malloc(len + 1);
strncpy(text, temp, len);
text[len] = '\0';
if(info->mode == IP6T_HL_EQ && *text == INVCHAR) {
info->mode = IP6T_HL_NE;
text++;
}
val = strtoul(text, &extent, 10);
if(extent != text + strlen(text)) {
SET_ERRSTR("%s: Couldn't parse field", field);
free(base);
return(FALSE);
}
free(base);
info->hop_limit = val;
}
else {
SET_ERRSTR("%s: Must have a string or integer arg", field);
return(FALSE);
}
return(TRUE);
}
static void get_fields(HV *ent_hash, void *myinfo, struct ip6t_entry *entry) {
MODULE_DATATYPE *info = (void *)((MODULE_ENTRYTYPE *)myinfo)->data;
SV *sv;
if(info->mode == IP6T_HL_NE)
sv = newSVpvf("%c%u", INVCHAR, info->hop_limit);
else
sv = newSViv(info->hop_limit);
if(info->mode == IP6T_HL_EQ || info->mode == IP6T_HL_NE)
hv_store(ent_hash, "hl-eq", 5, sv, 0);
else if(info->mode == IP6T_HL_LT)
hv_store(ent_hash, "hl-lt", 5, sv, 0);
else if(info->mode == IP6T_HL_GT)
hv_store(ent_hash, "hl-gt", 5, sv, 0);
}
int final_check(void *myinfo, int flags) {
if(!flags) {
SET_ERRSTR("hl match requires one of 'hl-eq', 'hl-lt', 'hl-gt'");
return(FALSE);
}
return(TRUE);
}
static ModuleDef _module = {
.type = MODULE_TYPE,
.name = MODULE_NAME,
.size = IP6T_ALIGN(sizeof(MODULE_DATATYPE)),
.size_uspace = IP6T_ALIGN(sizeof(MODULE_DATATYPE)),
.setup = setup,
.parse_field = parse_field,
.get_fields = get_fields,
.final_check = final_check
};
ModuleDef *init(void) {
return(&_module);
}
/* vim: ts=4
*/