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- /*
- * 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_regs *regs,
- const struct nft_pktinfo *pkt)
- {
- const struct nft_byteorder *priv = nft_expr_priv(expr);
- u32 *src = ®s->data[priv->sreg];
- u32 *dst = ®s->data[priv->dreg];
- union { u32 u32; u16 u16; } *s, *d;
- unsigned int i;
- s = (void *)src;
- d = (void *)dst;
- 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->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->size = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_SIZE]));
- switch (priv->size) {
- case 2:
- case 4:
- break;
- default:
- return -EINVAL;
- }
- priv->sreg = nft_parse_register(tb[NFTA_BYTEORDER_SREG]);
- priv->len = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_LEN]));
- err = nft_validate_register_load(priv->sreg, priv->len);
- if (err < 0)
- return err;
- priv->dreg = nft_parse_register(tb[NFTA_BYTEORDER_DREG]);
- return nft_validate_register_store(ctx, priv->dreg, NULL,
- NFT_DATA_VALUE, priv->len);
- }
- static int nft_byteorder_dump(struct sk_buff *skb, const struct nft_expr *expr)
- {
- const struct nft_byteorder *priv = nft_expr_priv(expr);
- if (nft_dump_register(skb, NFTA_BYTEORDER_SREG, priv->sreg))
- goto nla_put_failure;
- if (nft_dump_register(skb, NFTA_BYTEORDER_DREG, 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);
- }
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