swh:1:snp:173f8deb0c56c557784b4fd217e7608ac6197844
Tip revision: 06e5801b8cb3fc057d88cb4dc03c0b64b2744cda authored by Linus Torvalds on 16 March 2015, 00:38:20 UTC
Linux 4.0-rc4
Linux 4.0-rc4
Tip revision: 06e5801
nft_byteorder.c
/*
* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Development of this code funded by Astaro AG (http://www.astaro.com/)
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables_core.h>
#include <net/netfilter/nf_tables.h>
struct nft_byteorder {
enum nft_registers sreg:8;
enum nft_registers dreg:8;
enum nft_byteorder_ops op:8;
u8 len;
u8 size;
};
static void nft_byteorder_eval(const struct nft_expr *expr,
struct nft_data data[NFT_REG_MAX + 1],
const struct nft_pktinfo *pkt)
{
const struct nft_byteorder *priv = nft_expr_priv(expr);
struct nft_data *src = &data[priv->sreg], *dst = &data[priv->dreg];
union { u32 u32; u16 u16; } *s, *d;
unsigned int i;
s = (void *)src->data;
d = (void *)dst->data;
switch (priv->size) {
case 4:
switch (priv->op) {
case NFT_BYTEORDER_NTOH:
for (i = 0; i < priv->len / 4; i++)
d[i].u32 = ntohl((__force __be32)s[i].u32);
break;
case NFT_BYTEORDER_HTON:
for (i = 0; i < priv->len / 4; i++)
d[i].u32 = (__force __u32)htonl(s[i].u32);
break;
}
break;
case 2:
switch (priv->op) {
case NFT_BYTEORDER_NTOH:
for (i = 0; i < priv->len / 2; i++)
d[i].u16 = ntohs((__force __be16)s[i].u16);
break;
case NFT_BYTEORDER_HTON:
for (i = 0; i < priv->len / 2; i++)
d[i].u16 = (__force __u16)htons(s[i].u16);
break;
}
break;
}
}
static const struct nla_policy nft_byteorder_policy[NFTA_BYTEORDER_MAX + 1] = {
[NFTA_BYTEORDER_SREG] = { .type = NLA_U32 },
[NFTA_BYTEORDER_DREG] = { .type = NLA_U32 },
[NFTA_BYTEORDER_OP] = { .type = NLA_U32 },
[NFTA_BYTEORDER_LEN] = { .type = NLA_U32 },
[NFTA_BYTEORDER_SIZE] = { .type = NLA_U32 },
};
static int nft_byteorder_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_byteorder *priv = nft_expr_priv(expr);
int err;
if (tb[NFTA_BYTEORDER_SREG] == NULL ||
tb[NFTA_BYTEORDER_DREG] == NULL ||
tb[NFTA_BYTEORDER_LEN] == NULL ||
tb[NFTA_BYTEORDER_SIZE] == NULL ||
tb[NFTA_BYTEORDER_OP] == NULL)
return -EINVAL;
priv->sreg = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_SREG]));
err = nft_validate_input_register(priv->sreg);
if (err < 0)
return err;
priv->dreg = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_DREG]));
err = nft_validate_output_register(priv->dreg);
if (err < 0)
return err;
err = nft_validate_data_load(ctx, priv->dreg, NULL, NFT_DATA_VALUE);
if (err < 0)
return err;
priv->op = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_OP]));
switch (priv->op) {
case NFT_BYTEORDER_NTOH:
case NFT_BYTEORDER_HTON:
break;
default:
return -EINVAL;
}
priv->len = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_LEN]));
if (priv->len == 0 || priv->len > FIELD_SIZEOF(struct nft_data, data))
return -EINVAL;
priv->size = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_SIZE]));
switch (priv->size) {
case 2:
case 4:
break;
default:
return -EINVAL;
}
return 0;
}
static int nft_byteorder_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
const struct nft_byteorder *priv = nft_expr_priv(expr);
if (nla_put_be32(skb, NFTA_BYTEORDER_SREG, htonl(priv->sreg)))
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_BYTEORDER_DREG, htonl(priv->dreg)))
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_BYTEORDER_OP, htonl(priv->op)))
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_BYTEORDER_LEN, htonl(priv->len)))
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_BYTEORDER_SIZE, htonl(priv->size)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
static struct nft_expr_type nft_byteorder_type;
static const struct nft_expr_ops nft_byteorder_ops = {
.type = &nft_byteorder_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_byteorder)),
.eval = nft_byteorder_eval,
.init = nft_byteorder_init,
.dump = nft_byteorder_dump,
};
static struct nft_expr_type nft_byteorder_type __read_mostly = {
.name = "byteorder",
.ops = &nft_byteorder_ops,
.policy = nft_byteorder_policy,
.maxattr = NFTA_BYTEORDER_MAX,
.owner = THIS_MODULE,
};
int __init nft_byteorder_module_init(void)
{
return nft_register_expr(&nft_byteorder_type);
}
void nft_byteorder_module_exit(void)
{
nft_unregister_expr(&nft_byteorder_type);
}