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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (c) 2009 Patrick McHardy <kaber@trash.net>
- *
- * Development of this code funded by Astaro AG (http://www.astaro.com/)
- */
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/list.h>
- #include <linux/rbtree.h>
- #include <linux/netlink.h>
- #include <linux/netfilter.h>
- #include <linux/netfilter/nf_tables.h>
- #include <net/netfilter/nf_tables.h>
- #include <net/netfilter/nf_tables_core.h>
- struct nft_lookup {
- struct nft_set *set;
- enum nft_registers sreg:8;
- enum nft_registers dreg:8;
- bool invert;
- struct nft_set_binding binding;
- };
- void nft_lookup_eval(const struct nft_expr *expr,
- struct nft_regs *regs,
- const struct nft_pktinfo *pkt)
- {
- const struct nft_lookup *priv = nft_expr_priv(expr);
- const struct nft_set *set = priv->set;
- const struct nft_set_ext *ext = NULL;
- bool found;
- found = set->ops->lookup(nft_net(pkt), set, ®s->data[priv->sreg],
- &ext) ^ priv->invert;
- if (!found) {
- regs->verdict.code = NFT_BREAK;
- return;
- }
- if (ext) {
- if (set->flags & NFT_SET_MAP)
- nft_data_copy(®s->data[priv->dreg],
- nft_set_ext_data(ext), set->dlen);
- nft_set_elem_update_expr(ext, regs, pkt);
- }
- }
- static const struct nla_policy nft_lookup_policy[NFTA_LOOKUP_MAX + 1] = {
- [NFTA_LOOKUP_SET] = { .type = NLA_STRING,
- .len = NFT_SET_MAXNAMELEN - 1 },
- [NFTA_LOOKUP_SET_ID] = { .type = NLA_U32 },
- [NFTA_LOOKUP_SREG] = { .type = NLA_U32 },
- [NFTA_LOOKUP_DREG] = { .type = NLA_U32 },
- [NFTA_LOOKUP_FLAGS] = { .type = NLA_U32 },
- };
- static int nft_lookup_init(const struct nft_ctx *ctx,
- const struct nft_expr *expr,
- const struct nlattr * const tb[])
- {
- struct nft_lookup *priv = nft_expr_priv(expr);
- u8 genmask = nft_genmask_next(ctx->net);
- struct nft_set *set;
- u32 flags;
- int err;
- if (tb[NFTA_LOOKUP_SET] == NULL ||
- tb[NFTA_LOOKUP_SREG] == NULL)
- return -EINVAL;
- set = nft_set_lookup_global(ctx->net, ctx->table, tb[NFTA_LOOKUP_SET],
- tb[NFTA_LOOKUP_SET_ID], genmask);
- if (IS_ERR(set))
- return PTR_ERR(set);
- priv->sreg = nft_parse_register(tb[NFTA_LOOKUP_SREG]);
- err = nft_validate_register_load(priv->sreg, set->klen);
- if (err < 0)
- return err;
- if (tb[NFTA_LOOKUP_FLAGS]) {
- flags = ntohl(nla_get_be32(tb[NFTA_LOOKUP_FLAGS]));
- if (flags & ~NFT_LOOKUP_F_INV)
- return -EINVAL;
- if (flags & NFT_LOOKUP_F_INV) {
- if (set->flags & NFT_SET_MAP)
- return -EINVAL;
- priv->invert = true;
- }
- }
- if (tb[NFTA_LOOKUP_DREG] != NULL) {
- if (priv->invert)
- return -EINVAL;
- if (!(set->flags & NFT_SET_MAP))
- return -EINVAL;
- priv->dreg = nft_parse_register(tb[NFTA_LOOKUP_DREG]);
- err = nft_validate_register_store(ctx, priv->dreg, NULL,
- set->dtype, set->dlen);
- if (err < 0)
- return err;
- } else if (set->flags & NFT_SET_MAP)
- return -EINVAL;
- priv->binding.flags = set->flags & NFT_SET_MAP;
- err = nf_tables_bind_set(ctx, set, &priv->binding);
- if (err < 0)
- return err;
- priv->set = set;
- return 0;
- }
- static void nft_lookup_deactivate(const struct nft_ctx *ctx,
- const struct nft_expr *expr,
- enum nft_trans_phase phase)
- {
- struct nft_lookup *priv = nft_expr_priv(expr);
- nf_tables_deactivate_set(ctx, priv->set, &priv->binding, phase);
- }
- static void nft_lookup_activate(const struct nft_ctx *ctx,
- const struct nft_expr *expr)
- {
- struct nft_lookup *priv = nft_expr_priv(expr);
- priv->set->use++;
- }
- static void nft_lookup_destroy(const struct nft_ctx *ctx,
- const struct nft_expr *expr)
- {
- struct nft_lookup *priv = nft_expr_priv(expr);
- nf_tables_destroy_set(ctx, priv->set);
- }
- static int nft_lookup_dump(struct sk_buff *skb, const struct nft_expr *expr)
- {
- const struct nft_lookup *priv = nft_expr_priv(expr);
- u32 flags = priv->invert ? NFT_LOOKUP_F_INV : 0;
- if (nla_put_string(skb, NFTA_LOOKUP_SET, priv->set->name))
- goto nla_put_failure;
- if (nft_dump_register(skb, NFTA_LOOKUP_SREG, priv->sreg))
- goto nla_put_failure;
- if (priv->set->flags & NFT_SET_MAP)
- if (nft_dump_register(skb, NFTA_LOOKUP_DREG, priv->dreg))
- goto nla_put_failure;
- if (nla_put_be32(skb, NFTA_LOOKUP_FLAGS, htonl(flags)))
- goto nla_put_failure;
- return 0;
- nla_put_failure:
- return -1;
- }
- static int nft_lookup_validate_setelem(const struct nft_ctx *ctx,
- struct nft_set *set,
- const struct nft_set_iter *iter,
- struct nft_set_elem *elem)
- {
- const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
- struct nft_ctx *pctx = (struct nft_ctx *)ctx;
- const struct nft_data *data;
- int err;
- if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
- *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
- return 0;
- data = nft_set_ext_data(ext);
- 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 int nft_lookup_validate(const struct nft_ctx *ctx,
- const struct nft_expr *expr,
- const struct nft_data **d)
- {
- const struct nft_lookup *priv = nft_expr_priv(expr);
- struct nft_set_iter iter;
- if (!(priv->set->flags & NFT_SET_MAP) ||
- priv->set->dtype != NFT_DATA_VERDICT)
- return 0;
- iter.genmask = nft_genmask_next(ctx->net);
- iter.skip = 0;
- iter.count = 0;
- iter.err = 0;
- iter.fn = nft_lookup_validate_setelem;
- priv->set->ops->walk(ctx, priv->set, &iter);
- if (iter.err < 0)
- return iter.err;
- return 0;
- }
- static const struct nft_expr_ops nft_lookup_ops = {
- .type = &nft_lookup_type,
- .size = NFT_EXPR_SIZE(sizeof(struct nft_lookup)),
- .eval = nft_lookup_eval,
- .init = nft_lookup_init,
- .activate = nft_lookup_activate,
- .deactivate = nft_lookup_deactivate,
- .destroy = nft_lookup_destroy,
- .dump = nft_lookup_dump,
- .validate = nft_lookup_validate,
- };
- struct nft_expr_type nft_lookup_type __read_mostly = {
- .name = "lookup",
- .ops = &nft_lookup_ops,
- .policy = nft_lookup_policy,
- .maxattr = NFTA_LOOKUP_MAX,
- .owner = THIS_MODULE,
- };
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