2015-04-05 06:41:08 -06:00
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/*
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* Copyright (c) 2015 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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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.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_dynset {
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struct nft_set *set;
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struct nft_set_ext_tmpl tmpl;
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enum nft_dynset_ops op:8;
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enum nft_registers sreg_key:8;
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enum nft_registers sreg_data:8;
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u64 timeout;
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2015-04-11 03:46:42 -06:00
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struct nft_expr *expr;
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2015-04-05 06:41:08 -06:00
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struct nft_set_binding binding;
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};
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static void *nft_dynset_new(struct nft_set *set, const struct nft_expr *expr,
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2015-04-10 19:27:31 -06:00
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struct nft_regs *regs)
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2015-04-05 06:41:08 -06:00
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{
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const struct nft_dynset *priv = nft_expr_priv(expr);
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2015-04-11 03:46:42 -06:00
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struct nft_set_ext *ext;
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2015-04-05 06:41:08 -06:00
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u64 timeout;
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void *elem;
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if (set->size && !atomic_add_unless(&set->nelems, 1, set->size))
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return NULL;
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timeout = priv->timeout ? : set->timeout;
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elem = nft_set_elem_init(set, &priv->tmpl,
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2015-04-10 19:27:31 -06:00
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®s->data[priv->sreg_key],
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®s->data[priv->sreg_data],
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2015-04-05 06:41:08 -06:00
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timeout, GFP_ATOMIC);
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if (elem == NULL) {
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if (set->size)
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atomic_dec(&set->nelems);
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2015-04-11 03:46:42 -06:00
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return NULL;
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2015-04-05 06:41:08 -06:00
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}
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2015-04-11 03:46:42 -06:00
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ext = nft_set_elem_ext(set, elem);
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if (priv->expr != NULL)
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nft_expr_clone(nft_set_ext_expr(ext), priv->expr);
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2015-04-05 06:41:08 -06:00
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return elem;
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}
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static void nft_dynset_eval(const struct nft_expr *expr,
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2015-04-10 19:27:31 -06:00
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struct nft_regs *regs,
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2015-04-05 06:41:08 -06:00
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const struct nft_pktinfo *pkt)
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{
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const struct nft_dynset *priv = nft_expr_priv(expr);
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struct nft_set *set = priv->set;
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const struct nft_set_ext *ext;
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2015-04-11 03:46:42 -06:00
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const struct nft_expr *sexpr;
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2015-04-05 06:41:08 -06:00
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u64 timeout;
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2015-04-10 19:27:31 -06:00
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if (set->ops->update(set, ®s->data[priv->sreg_key], nft_dynset_new,
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expr, regs, &ext)) {
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2015-04-11 03:46:42 -06:00
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sexpr = NULL;
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if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
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sexpr = nft_set_ext_expr(ext);
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2015-04-05 06:41:08 -06:00
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if (priv->op == NFT_DYNSET_OP_UPDATE &&
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nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
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timeout = priv->timeout ? : set->timeout;
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*nft_set_ext_expiration(ext) = jiffies + timeout;
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2015-04-11 03:46:42 -06:00
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} else if (sexpr == NULL)
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goto out;
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2015-04-05 06:41:08 -06:00
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2015-04-11 03:46:42 -06:00
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if (sexpr != NULL)
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sexpr->ops->eval(sexpr, regs, pkt);
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return;
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}
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out:
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2015-04-10 19:27:31 -06:00
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regs->verdict.code = NFT_BREAK;
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2015-04-05 06:41:08 -06:00
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}
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static const struct nla_policy nft_dynset_policy[NFTA_DYNSET_MAX + 1] = {
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[NFTA_DYNSET_SET_NAME] = { .type = NLA_STRING },
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[NFTA_DYNSET_SET_ID] = { .type = NLA_U32 },
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[NFTA_DYNSET_OP] = { .type = NLA_U32 },
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[NFTA_DYNSET_SREG_KEY] = { .type = NLA_U32 },
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[NFTA_DYNSET_SREG_DATA] = { .type = NLA_U32 },
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[NFTA_DYNSET_TIMEOUT] = { .type = NLA_U64 },
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2015-04-11 03:46:42 -06:00
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[NFTA_DYNSET_EXPR] = { .type = NLA_NESTED },
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2015-04-05 06:41:08 -06:00
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};
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static int nft_dynset_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_dynset *priv = nft_expr_priv(expr);
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struct nft_set *set;
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u64 timeout;
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int err;
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if (tb[NFTA_DYNSET_SET_NAME] == NULL ||
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tb[NFTA_DYNSET_OP] == NULL ||
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tb[NFTA_DYNSET_SREG_KEY] == NULL)
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return -EINVAL;
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set = nf_tables_set_lookup(ctx->table, tb[NFTA_DYNSET_SET_NAME]);
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if (IS_ERR(set)) {
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if (tb[NFTA_DYNSET_SET_ID])
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set = nf_tables_set_lookup_byid(ctx->net,
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tb[NFTA_DYNSET_SET_ID]);
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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_CONSTANT)
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return -EBUSY;
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priv->op = ntohl(nla_get_be32(tb[NFTA_DYNSET_OP]));
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switch (priv->op) {
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case NFT_DYNSET_OP_ADD:
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break;
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case NFT_DYNSET_OP_UPDATE:
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if (!(set->flags & NFT_SET_TIMEOUT))
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return -EOPNOTSUPP;
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break;
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default:
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return -EOPNOTSUPP;
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}
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timeout = 0;
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if (tb[NFTA_DYNSET_TIMEOUT] != NULL) {
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if (!(set->flags & NFT_SET_TIMEOUT))
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return -EINVAL;
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timeout = be64_to_cpu(nla_get_be64(tb[NFTA_DYNSET_TIMEOUT]));
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}
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2015-04-10 19:27:36 -06:00
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priv->sreg_key = nft_parse_register(tb[NFTA_DYNSET_SREG_KEY]);
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2015-04-10 19:27:30 -06:00
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err = nft_validate_register_load(priv->sreg_key, set->klen);;
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2015-04-05 06:41:08 -06:00
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if (err < 0)
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return err;
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if (tb[NFTA_DYNSET_SREG_DATA] != NULL) {
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if (!(set->flags & NFT_SET_MAP))
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return -EINVAL;
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if (set->dtype == NFT_DATA_VERDICT)
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return -EOPNOTSUPP;
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2015-04-10 19:27:36 -06:00
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priv->sreg_data = nft_parse_register(tb[NFTA_DYNSET_SREG_DATA]);
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2015-04-10 19:27:30 -06:00
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err = nft_validate_register_load(priv->sreg_data, set->dlen);
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2015-04-05 06:41:08 -06:00
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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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2015-04-11 03:46:42 -06:00
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if (tb[NFTA_DYNSET_EXPR] != NULL) {
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if (!(set->flags & NFT_SET_EVAL))
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return -EINVAL;
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if (!(set->flags & NFT_SET_ANONYMOUS))
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return -EOPNOTSUPP;
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priv->expr = nft_expr_init(ctx, tb[NFTA_DYNSET_EXPR]);
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if (IS_ERR(priv->expr))
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return PTR_ERR(priv->expr);
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err = -EOPNOTSUPP;
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if (!(priv->expr->ops->type->flags & NFT_EXPR_STATEFUL))
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goto err1;
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} else if (set->flags & NFT_SET_EVAL)
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return -EINVAL;
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2015-04-05 06:41:08 -06:00
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nft_set_ext_prepare(&priv->tmpl);
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nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_KEY, set->klen);
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if (set->flags & NFT_SET_MAP)
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nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_DATA, set->dlen);
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2015-04-11 03:46:42 -06:00
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if (priv->expr != NULL)
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nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_EXPR,
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priv->expr->ops->size);
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2015-04-05 06:41:08 -06:00
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if (set->flags & NFT_SET_TIMEOUT) {
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if (timeout || set->timeout)
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nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_EXPIRATION);
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}
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priv->timeout = timeout;
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err = nf_tables_bind_set(ctx, set, &priv->binding);
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if (err < 0)
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2015-04-11 03:46:42 -06:00
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goto err1;
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2015-04-05 06:41:08 -06:00
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priv->set = set;
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return 0;
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2015-04-11 03:46:42 -06:00
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err1:
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if (priv->expr != NULL)
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nft_expr_destroy(ctx, priv->expr);
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return err;
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2015-04-05 06:41:08 -06:00
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}
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static void nft_dynset_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_dynset *priv = nft_expr_priv(expr);
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nf_tables_unbind_set(ctx, priv->set, &priv->binding);
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2015-04-11 03:46:42 -06:00
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if (priv->expr != NULL)
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nft_expr_destroy(ctx, priv->expr);
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2015-04-05 06:41:08 -06:00
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}
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static int nft_dynset_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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const struct nft_dynset *priv = nft_expr_priv(expr);
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2015-04-10 19:27:36 -06:00
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if (nft_dump_register(skb, NFTA_DYNSET_SREG_KEY, priv->sreg_key))
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2015-04-05 06:41:08 -06:00
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goto nla_put_failure;
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if (priv->set->flags & NFT_SET_MAP &&
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2015-04-10 19:27:36 -06:00
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nft_dump_register(skb, NFTA_DYNSET_SREG_DATA, priv->sreg_data))
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2015-04-05 06:41:08 -06:00
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goto nla_put_failure;
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if (nla_put_be32(skb, NFTA_DYNSET_OP, htonl(priv->op)))
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goto nla_put_failure;
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if (nla_put_string(skb, NFTA_DYNSET_SET_NAME, priv->set->name))
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goto nla_put_failure;
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if (nla_put_be64(skb, NFTA_DYNSET_TIMEOUT, cpu_to_be64(priv->timeout)))
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goto nla_put_failure;
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2015-04-11 03:46:42 -06:00
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if (priv->expr && nft_expr_dump(skb, NFTA_DYNSET_EXPR, priv->expr))
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goto nla_put_failure;
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2015-04-05 06:41:08 -06:00
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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_dynset_type;
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static const struct nft_expr_ops nft_dynset_ops = {
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.type = &nft_dynset_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_dynset)),
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.eval = nft_dynset_eval,
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.init = nft_dynset_init,
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.destroy = nft_dynset_destroy,
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.dump = nft_dynset_dump,
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};
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static struct nft_expr_type nft_dynset_type __read_mostly = {
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.name = "dynset",
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.ops = &nft_dynset_ops,
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.policy = nft_dynset_policy,
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.maxattr = NFTA_DYNSET_MAX,
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.owner = THIS_MODULE,
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};
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int __init nft_dynset_module_init(void)
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{
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return nft_register_expr(&nft_dynset_type);
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}
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void nft_dynset_module_exit(void)
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{
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nft_unregister_expr(&nft_dynset_type);
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}
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