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![Paul Gortmaker](/assets/img/avatar_default.png)
The nf_tables.h header is used in a lot of files, but it turns out that there is only one actual user of nft_expr_clone(). Hence we relocate that function to be with the one consumer of it and avoid having to process it with CPP for all the other files. This will also enable a reduction in the other headers that the nf_tables.h itself has to include just to be stand-alone, hence a pending further significant reduction in the CPP content that needs to get processed for each netfilter file. Note that the explicit "inline" has been dropped as part of this relocation. In similar changes to this, I believe Dave has asked this be done, so we free up gcc to make the choice of whether to inline or not. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
327 lines
8.2 KiB
C
327 lines
8.2 KiB
C
/*
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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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bool invert;
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u64 timeout;
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struct nft_expr *expr;
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struct nft_set_binding binding;
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};
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static int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
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{
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int err;
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if (src->ops->clone) {
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dst->ops = src->ops;
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err = src->ops->clone(dst, src);
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if (err < 0)
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return err;
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} else {
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memcpy(dst, src, src->ops->size);
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}
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__module_get(src->ops->type->owner);
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return 0;
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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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struct nft_regs *regs)
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{
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const struct nft_dynset *priv = nft_expr_priv(expr);
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struct nft_set_ext *ext;
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u64 timeout;
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void *elem;
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if (!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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®s->data[priv->sreg_key],
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®s->data[priv->sreg_data],
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timeout, GFP_ATOMIC);
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if (elem == NULL)
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goto err1;
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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) < 0)
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goto err2;
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return elem;
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err2:
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nft_set_elem_destroy(set, elem, false);
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err1:
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if (set->size)
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atomic_dec(&set->nelems);
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return NULL;
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}
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void nft_dynset_eval(const struct nft_expr *expr,
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struct nft_regs *regs, 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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const struct nft_expr *sexpr;
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u64 timeout;
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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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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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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) = get_jiffies_64() + timeout;
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}
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if (sexpr != NULL)
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sexpr->ops->eval(sexpr, regs, pkt);
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if (priv->invert)
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regs->verdict.code = NFT_BREAK;
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return;
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}
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if (!priv->invert)
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regs->verdict.code = NFT_BREAK;
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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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.len = NFT_SET_MAXNAMELEN - 1 },
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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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[NFTA_DYNSET_EXPR] = { .type = NLA_NESTED },
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[NFTA_DYNSET_FLAGS] = { .type = NLA_U32 },
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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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u8 genmask = nft_genmask_next(ctx->net);
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struct nft_set *set;
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u64 timeout;
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int err;
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lockdep_assert_held(&ctx->net->nft.commit_mutex);
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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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if (tb[NFTA_DYNSET_FLAGS]) {
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u32 flags = ntohl(nla_get_be32(tb[NFTA_DYNSET_FLAGS]));
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if (flags & ~NFT_DYNSET_F_INV)
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return -EINVAL;
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if (flags & NFT_DYNSET_F_INV)
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priv->invert = true;
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}
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set = nft_set_lookup_global(ctx->net, ctx->table,
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tb[NFTA_DYNSET_SET_NAME],
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tb[NFTA_DYNSET_SET_ID], genmask);
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if (IS_ERR(set))
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return PTR_ERR(set);
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if (set->ops->update == NULL)
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return -EOPNOTSUPP;
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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 = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
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tb[NFTA_DYNSET_TIMEOUT])));
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}
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priv->sreg_key = nft_parse_register(tb[NFTA_DYNSET_SREG_KEY]);
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err = nft_validate_register_load(priv->sreg_key, set->klen);
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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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priv->sreg_data = nft_parse_register(tb[NFTA_DYNSET_SREG_DATA]);
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err = nft_validate_register_load(priv->sreg_data, 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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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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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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if (priv->expr->ops->type->flags & NFT_EXPR_GC) {
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if (set->flags & NFT_SET_TIMEOUT)
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goto err1;
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if (!set->ops->gc_init)
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goto err1;
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set->ops->gc_init(set);
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}
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}
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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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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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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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goto err1;
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if (set->size == 0)
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set->size = 0xffff;
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priv->set = set;
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return 0;
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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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}
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static void nft_dynset_deactivate(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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enum nft_trans_phase phase)
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{
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struct nft_dynset *priv = nft_expr_priv(expr);
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nf_tables_deactivate_set(ctx, priv->set, &priv->binding, phase);
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}
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static void nft_dynset_activate(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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priv->set->use++;
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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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if (priv->expr != NULL)
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nft_expr_destroy(ctx, priv->expr);
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nf_tables_destroy_set(ctx, priv->set);
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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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u32 flags = priv->invert ? NFT_DYNSET_F_INV : 0;
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if (nft_dump_register(skb, NFTA_DYNSET_SREG_KEY, priv->sreg_key))
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goto nla_put_failure;
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if (priv->set->flags & NFT_SET_MAP &&
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nft_dump_register(skb, NFTA_DYNSET_SREG_DATA, priv->sreg_data))
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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,
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cpu_to_be64(jiffies_to_msecs(priv->timeout)),
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NFTA_DYNSET_PAD))
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goto nla_put_failure;
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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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if (nla_put_be32(skb, NFTA_DYNSET_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 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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.activate = nft_dynset_activate,
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.deactivate = nft_dynset_deactivate,
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.dump = nft_dynset_dump,
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};
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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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