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/*
* (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org>
* (C) 2013 by Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <internal.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <stdint.h>
#include <arpa/inet.h>
#include <errno.h>
#include <inttypes.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
const char *nft_family2str(uint32_t family)
{
switch (family) {
case AF_INET:
return "ip";
case AF_INET6:
return "ip6";
case 1:
return "inet";
case AF_BRIDGE:
return "bridge";
case 3: /* NFPROTO_ARP */
return "arp";
default:
return "unknown";
}
}
int nft_str2family(const char *family)
{
if (strcmp(family, "ip") == 0)
return AF_INET;
else if (strcmp(family, "ip6") == 0)
return AF_INET6;
else if (strcmp(family, "inet") == 0)
return 1;
else if (strcmp(family, "bridge") == 0)
return AF_BRIDGE;
else if (strcmp(family, "arp") == 0)
return 0;
errno = EAFNOSUPPORT;
return -1;
}
static struct {
int len;
int64_t min;
uint64_t max;
} basetype[] = {
[NFT_TYPE_U8] = { .len = sizeof(uint8_t), .max = UINT8_MAX },
[NFT_TYPE_U16] = { .len = sizeof(uint16_t), .max = UINT16_MAX },
[NFT_TYPE_U32] = { .len = sizeof(uint32_t), .max = UINT32_MAX },
[NFT_TYPE_U64] = { .len = sizeof(uint64_t), .max = UINT64_MAX },
[NFT_TYPE_S8] = { .len = sizeof(int8_t), .min = INT8_MIN, .max = INT8_MAX },
[NFT_TYPE_S16] = { .len = sizeof(int16_t), .min = INT16_MIN, .max = INT16_MAX },
[NFT_TYPE_S32] = { .len = sizeof(int32_t), .min = INT32_MIN, .max = INT32_MAX },
[NFT_TYPE_S64] = { .len = sizeof(int64_t), .min = INT64_MIN, .max = INT64_MAX },
};
int nft_get_value(enum nft_type type, void *val, void *out)
{
int64_t sval;
uint64_t uval;
switch (type) {
case NFT_TYPE_U8:
case NFT_TYPE_U16:
case NFT_TYPE_U32:
case NFT_TYPE_U64:
uval = *((uint64_t *)val);
if (uval > basetype[type].max) {
errno = ERANGE;
return -1;
}
memcpy(out, &uval, basetype[type].len);
break;
case NFT_TYPE_S8:
case NFT_TYPE_S16:
case NFT_TYPE_S32:
case NFT_TYPE_S64:
sval = *((int64_t *)val);
if (sval < basetype[type].min ||
sval > (int64_t)basetype[type].max) {
errno = ERANGE;
return -1;
}
memcpy(out, &sval, basetype[type].len);
break;
}
return 0;
}
int nft_strtoi(const char *string, int base, void *out, enum nft_type type)
{
int ret;
int64_t sval = 0;
uint64_t uval = -1;
char *endptr;
switch (type) {
case NFT_TYPE_U8:
case NFT_TYPE_U16:
case NFT_TYPE_U32:
case NFT_TYPE_U64:
uval = strtoll(string, &endptr, base);
ret = nft_get_value(type, &uval, out);
break;
case NFT_TYPE_S8:
case NFT_TYPE_S16:
case NFT_TYPE_S32:
case NFT_TYPE_S64:
sval = strtoull(string, &endptr, base);
ret = nft_get_value(type, &sval, out);
break;
default:
errno = EINVAL;
return -1;
}
if (*endptr) {
errno = EINVAL;
return -1;
}
return ret;
}
const char *nft_verdict2str(uint32_t verdict)
{
switch (verdict) {
case NF_ACCEPT:
return "accept";
case NF_DROP:
return "drop";
case NFT_RETURN:
return "return";
case NFT_JUMP:
return "jump";
case NFT_GOTO:
return "goto";
default:
return "unknown";
}
}
int nft_str2verdict(const char *verdict, int *verdict_num)
{
if (strcmp(verdict, "accept") == 0) {
*verdict_num = NF_ACCEPT;
return 0;
} else if (strcmp(verdict, "drop") == 0) {
*verdict_num = NF_DROP;
return 0;
} else if (strcmp(verdict, "return") == 0) {
*verdict_num = NFT_RETURN;
return 0;
} else if (strcmp(verdict, "jump") == 0) {
*verdict_num = NFT_JUMP;
return 0;
} else if (strcmp(verdict, "goto") == 0) {
*verdict_num = NFT_GOTO;
return 0;
}
return -1;
}
void xfree(const void *ptr)
{
free((void *)ptr);
}
int nft_fprintf(FILE *fp, void *obj, uint32_t type, uint32_t flags,
int (*snprintf_cb)(char *buf, size_t bufsiz, void *obj,
uint32_t type, uint32_t flags))
{
char _buf[NFT_SNPRINTF_BUFSIZ];
char *buf = _buf;
size_t bufsiz = sizeof(_buf);
int ret;
ret = snprintf_cb(buf, bufsiz, obj, type, flags);
if (ret > NFT_SNPRINTF_BUFSIZ) {
buf = calloc(1, ret);
if (buf == NULL)
return -1;
bufsiz = ret;
ret = snprintf_cb(buf, bufsiz, obj, type, flags);
}
ret = fprintf(fp, "%s", buf);
if (buf != _buf)
xfree(buf);
return ret;
}
void __nft_assert_fail(uint16_t attr, const char *filename, int line)
{
fprintf(stderr, "libnftnl: attribute %d assertion failed in %s:%d\n",
attr, filename, line);
exit(EXIT_FAILURE);
}
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