| /* |
| * 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> |
| |
| static void nft_immediate_eval(const struct nft_expr *expr, |
| struct nft_regs *regs, |
| const struct nft_pktinfo *pkt) |
| { |
| const struct nft_immediate_expr *priv = nft_expr_priv(expr); |
| |
| nft_data_copy(®s->data[priv->dreg], &priv->data, priv->dlen); |
| } |
| |
| static const struct nla_policy nft_immediate_policy[NFTA_IMMEDIATE_MAX + 1] = { |
| [NFTA_IMMEDIATE_DREG] = { .type = NLA_U32 }, |
| [NFTA_IMMEDIATE_DATA] = { .type = NLA_NESTED }, |
| }; |
| |
| static int nft_immediate_init(const struct nft_ctx *ctx, |
| const struct nft_expr *expr, |
| const struct nlattr * const tb[]) |
| { |
| struct nft_immediate_expr *priv = nft_expr_priv(expr); |
| struct nft_data_desc desc; |
| int err; |
| |
| if (tb[NFTA_IMMEDIATE_DREG] == NULL || |
| tb[NFTA_IMMEDIATE_DATA] == NULL) |
| return -EINVAL; |
| |
| err = nft_data_init(ctx, &priv->data, sizeof(priv->data), &desc, |
| tb[NFTA_IMMEDIATE_DATA]); |
| if (err < 0) |
| return err; |
| |
| priv->dlen = desc.len; |
| |
| priv->dreg = nft_parse_register(tb[NFTA_IMMEDIATE_DREG]); |
| err = nft_validate_register_store(ctx, priv->dreg, &priv->data, |
| desc.type, desc.len); |
| if (err < 0) |
| goto err1; |
| |
| return 0; |
| |
| err1: |
| nft_data_release(&priv->data, desc.type); |
| return err; |
| } |
| |
| static void nft_immediate_activate(const struct nft_ctx *ctx, |
| const struct nft_expr *expr) |
| { |
| const struct nft_immediate_expr *priv = nft_expr_priv(expr); |
| |
| return nft_data_hold(&priv->data, nft_dreg_to_type(priv->dreg)); |
| } |
| |
| static void nft_immediate_deactivate(const struct nft_ctx *ctx, |
| const struct nft_expr *expr) |
| { |
| const struct nft_immediate_expr *priv = nft_expr_priv(expr); |
| |
| return nft_data_release(&priv->data, nft_dreg_to_type(priv->dreg)); |
| } |
| |
| static int nft_immediate_dump(struct sk_buff *skb, const struct nft_expr *expr) |
| { |
| const struct nft_immediate_expr *priv = nft_expr_priv(expr); |
| |
| if (nft_dump_register(skb, NFTA_IMMEDIATE_DREG, priv->dreg)) |
| goto nla_put_failure; |
| |
| return nft_data_dump(skb, NFTA_IMMEDIATE_DATA, &priv->data, |
| nft_dreg_to_type(priv->dreg), priv->dlen); |
| |
| nla_put_failure: |
| return -1; |
| } |
| |
| static int nft_immediate_validate(const struct nft_ctx *ctx, |
| const struct nft_expr *expr, |
| const struct nft_data **d) |
| { |
| const struct nft_immediate_expr *priv = nft_expr_priv(expr); |
| struct nft_ctx *pctx = (struct nft_ctx *)ctx; |
| const struct nft_data *data; |
| int err; |
| |
| if (priv->dreg != NFT_REG_VERDICT) |
| return 0; |
| |
| data = &priv->data; |
| |
| switch (data->verdict.code) { |
| case NFT_JUMP: |
| case NFT_GOTO: |
| pctx->level++; |
| err = nft_chain_validate(ctx, data->verdict.chain); |
| if (err < 0) |
| return err; |
| pctx->level--; |
| break; |
| default: |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static const struct nft_expr_ops nft_imm_ops = { |
| .type = &nft_imm_type, |
| .size = NFT_EXPR_SIZE(sizeof(struct nft_immediate_expr)), |
| .eval = nft_immediate_eval, |
| .init = nft_immediate_init, |
| .activate = nft_immediate_activate, |
| .deactivate = nft_immediate_deactivate, |
| .dump = nft_immediate_dump, |
| .validate = nft_immediate_validate, |
| }; |
| |
| struct nft_expr_type nft_imm_type __read_mostly = { |
| .name = "immediate", |
| .ops = &nft_imm_ops, |
| .policy = nft_immediate_policy, |
| .maxattr = NFTA_IMMEDIATE_MAX, |
| .owner = THIS_MODULE, |
| }; |