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Release 4.11 net/netfilter/nft_bitwise.c

Directory: net/netfilter
/*
 * 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_bitwise {
	
enum nft_registers	sreg:8;
	
enum nft_registers	dreg:8;
	
u8			len;
	
struct nft_data		mask;
	
struct nft_data		xor;
};


static void nft_bitwise_eval(const struct nft_expr *expr, struct nft_regs *regs, const struct nft_pktinfo *pkt) { const struct nft_bitwise *priv = nft_expr_priv(expr); const u32 *src = &regs->data[priv->sreg]; u32 *dst = &regs->data[priv->dreg]; unsigned int i; for (i = 0; i < DIV_ROUND_UP(priv->len, 4); i++) dst[i] = (src[i] & priv->mask.data[i]) ^ priv->xor.data[i]; }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy117100.00%3100.00%
Total117100.00%3100.00%

static const struct nla_policy nft_bitwise_policy[NFTA_BITWISE_MAX + 1] = { [NFTA_BITWISE_SREG] = { .type = NLA_U32 }, [NFTA_BITWISE_DREG] = { .type = NLA_U32 }, [NFTA_BITWISE_LEN] = { .type = NLA_U32 }, [NFTA_BITWISE_MASK] = { .type = NLA_NESTED }, [NFTA_BITWISE_XOR] = { .type = NLA_NESTED }, };
static int nft_bitwise_init(const struct nft_ctx *ctx, const struct nft_expr *expr, const struct nlattr * const tb[]) { struct nft_bitwise *priv = nft_expr_priv(expr); struct nft_data_desc d1, d2; u32 len; int err; if (tb[NFTA_BITWISE_SREG] == NULL || tb[NFTA_BITWISE_DREG] == NULL || tb[NFTA_BITWISE_LEN] == NULL || tb[NFTA_BITWISE_MASK] == NULL || tb[NFTA_BITWISE_XOR] == NULL) return -EINVAL; err = nft_parse_u32_check(tb[NFTA_BITWISE_LEN], U8_MAX, &len); if (err < 0) return err; priv->len = len; priv->sreg = nft_parse_register(tb[NFTA_BITWISE_SREG]); err = nft_validate_register_load(priv->sreg, priv->len); if (err < 0) return err; priv->dreg = nft_parse_register(tb[NFTA_BITWISE_DREG]); err = nft_validate_register_store(ctx, priv->dreg, NULL, NFT_DATA_VALUE, priv->len); if (err < 0) return err; err = nft_data_init(NULL, &priv->mask, sizeof(priv->mask), &d1, tb[NFTA_BITWISE_MASK]); if (err < 0) return err; if (d1.len != priv->len) return -EINVAL; err = nft_data_init(NULL, &priv->xor, sizeof(priv->xor), &d2, tb[NFTA_BITWISE_XOR]); if (err < 0) return err; if (d2.len != priv->len) return -EINVAL; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy27191.55%685.71%
Laura Garcia Liebana258.45%114.29%
Total296100.00%7100.00%


static int nft_bitwise_dump(struct sk_buff *skb, const struct nft_expr *expr) { const struct nft_bitwise *priv = nft_expr_priv(expr); if (nft_dump_register(skb, NFTA_BITWISE_SREG, priv->sreg)) goto nla_put_failure; if (nft_dump_register(skb, NFTA_BITWISE_DREG, priv->dreg)) goto nla_put_failure; if (nla_put_be32(skb, NFTA_BITWISE_LEN, htonl(priv->len))) goto nla_put_failure; if (nft_data_dump(skb, NFTA_BITWISE_MASK, &priv->mask, NFT_DATA_VALUE, priv->len) < 0) goto nla_put_failure; if (nft_data_dump(skb, NFTA_BITWISE_XOR, &priv->xor, NFT_DATA_VALUE, priv->len) < 0) goto nla_put_failure; return 0; nla_put_failure: return -1; }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy138100.00%2100.00%
Total138100.00%2100.00%

static const struct nft_expr_ops nft_bitwise_ops = { .type = &nft_bitwise_type, .size = NFT_EXPR_SIZE(sizeof(struct nft_bitwise)), .eval = nft_bitwise_eval, .init = nft_bitwise_init, .dump = nft_bitwise_dump, }; struct nft_expr_type nft_bitwise_type __read_mostly = { .name = "bitwise", .ops = &nft_bitwise_ops, .policy = nft_bitwise_policy, .maxattr = NFTA_BITWISE_MAX, .owner = THIS_MODULE, };

Overall Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy72196.65%990.00%
Laura Garcia Liebana253.35%110.00%
Total746100.00%10100.00%
Directory: net/netfilter
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