![Pablo Neira Ayuso](/assets/img/avatar_default.png)
We already checked for !found just a bit before: if (!found) { regs->verdict.code = NFT_BREAK; return; } if (found && set->flags & NFT_SET_MAP) ^^^^^ So this redundant check can just go away. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
185 lines
4.6 KiB
C
185 lines
4.6 KiB
C
/*
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* Copyright (c) 2009 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Development of this code funded by Astaro AG (http://www.astaro.com/)
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/rbtree.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables_core.h>
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struct nft_lookup {
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struct nft_set *set;
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enum nft_registers sreg:8;
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enum nft_registers dreg:8;
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bool invert;
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struct nft_set_binding binding;
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};
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static void nft_lookup_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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const struct nft_lookup *priv = nft_expr_priv(expr);
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const struct nft_set *set = priv->set;
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const struct nft_set_ext *ext;
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bool found;
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found = set->ops->lookup(pkt->net, set, ®s->data[priv->sreg], &ext) ^
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priv->invert;
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if (!found) {
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regs->verdict.code = NFT_BREAK;
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return;
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}
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if (set->flags & NFT_SET_MAP)
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nft_data_copy(®s->data[priv->dreg],
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nft_set_ext_data(ext), set->dlen);
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}
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static const struct nla_policy nft_lookup_policy[NFTA_LOOKUP_MAX + 1] = {
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[NFTA_LOOKUP_SET] = { .type = NLA_STRING },
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[NFTA_LOOKUP_SET_ID] = { .type = NLA_U32 },
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[NFTA_LOOKUP_SREG] = { .type = NLA_U32 },
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[NFTA_LOOKUP_DREG] = { .type = NLA_U32 },
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[NFTA_LOOKUP_FLAGS] = { .type = NLA_U32 },
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};
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static int nft_lookup_init(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_lookup *priv = nft_expr_priv(expr);
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u8 genmask = nft_genmask_next(ctx->net);
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struct nft_set *set;
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u32 flags;
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int err;
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if (tb[NFTA_LOOKUP_SET] == NULL ||
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tb[NFTA_LOOKUP_SREG] == NULL)
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return -EINVAL;
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set = nf_tables_set_lookup(ctx->table, tb[NFTA_LOOKUP_SET], genmask);
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if (IS_ERR(set)) {
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if (tb[NFTA_LOOKUP_SET_ID]) {
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set = nf_tables_set_lookup_byid(ctx->net,
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tb[NFTA_LOOKUP_SET_ID],
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genmask);
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}
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if (IS_ERR(set))
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return PTR_ERR(set);
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}
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if (set->flags & NFT_SET_EVAL)
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return -EOPNOTSUPP;
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priv->sreg = nft_parse_register(tb[NFTA_LOOKUP_SREG]);
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err = nft_validate_register_load(priv->sreg, set->klen);
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if (err < 0)
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return err;
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if (tb[NFTA_LOOKUP_FLAGS]) {
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flags = ntohl(nla_get_be32(tb[NFTA_LOOKUP_FLAGS]));
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if (flags & ~NFT_LOOKUP_F_INV)
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return -EINVAL;
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if (flags & NFT_LOOKUP_F_INV) {
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if (set->flags & NFT_SET_MAP)
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return -EINVAL;
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priv->invert = true;
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}
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}
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if (tb[NFTA_LOOKUP_DREG] != NULL) {
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if (priv->invert)
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return -EINVAL;
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if (!(set->flags & NFT_SET_MAP))
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return -EINVAL;
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priv->dreg = nft_parse_register(tb[NFTA_LOOKUP_DREG]);
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err = nft_validate_register_store(ctx, priv->dreg, NULL,
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set->dtype, set->dlen);
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if (err < 0)
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return err;
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} else if (set->flags & NFT_SET_MAP)
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return -EINVAL;
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priv->binding.flags = set->flags & NFT_SET_MAP;
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err = nf_tables_bind_set(ctx, set, &priv->binding);
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if (err < 0)
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return err;
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priv->set = set;
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return 0;
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}
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static void nft_lookup_destroy(const struct nft_ctx *ctx,
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const struct nft_expr *expr)
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{
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struct nft_lookup *priv = nft_expr_priv(expr);
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nf_tables_unbind_set(ctx, priv->set, &priv->binding);
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}
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static int nft_lookup_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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const struct nft_lookup *priv = nft_expr_priv(expr);
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u32 flags = priv->invert ? NFT_LOOKUP_F_INV : 0;
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if (nla_put_string(skb, NFTA_LOOKUP_SET, priv->set->name))
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goto nla_put_failure;
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if (nft_dump_register(skb, NFTA_LOOKUP_SREG, priv->sreg))
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goto nla_put_failure;
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if (priv->set->flags & NFT_SET_MAP)
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if (nft_dump_register(skb, NFTA_LOOKUP_DREG, priv->dreg))
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goto nla_put_failure;
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if (nla_put_be32(skb, NFTA_LOOKUP_FLAGS, htonl(flags)))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -1;
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}
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static struct nft_expr_type nft_lookup_type;
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static const struct nft_expr_ops nft_lookup_ops = {
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.type = &nft_lookup_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_lookup)),
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.eval = nft_lookup_eval,
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.init = nft_lookup_init,
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.destroy = nft_lookup_destroy,
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.dump = nft_lookup_dump,
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};
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static struct nft_expr_type nft_lookup_type __read_mostly = {
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.name = "lookup",
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.ops = &nft_lookup_ops,
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.policy = nft_lookup_policy,
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.maxattr = NFTA_LOOKUP_MAX,
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.owner = THIS_MODULE,
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};
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int __init nft_lookup_module_init(void)
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{
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return nft_register_expr(&nft_lookup_type);
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}
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void nft_lookup_module_exit(void)
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{
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nft_unregister_expr(&nft_lookup_type);
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}
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