Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 433 insertions, 0 deletions

diff --git a/net/netfilter/nft_dynset.c b/net/netfilter/nft_dynset.c
new file mode 100644
index 000000000..a470e5f61
--- /dev/null
+++ b/net/netfilter/nft_dynset.c
@@ -0,0 +1,433 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2015 Patrick McHardy <kaber@trash.net>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.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_dynset {
+	struct nft_set			*set;
+	struct nft_set_ext_tmpl		tmpl;
+	enum nft_dynset_ops		op:8;
+	u8				sreg_key;
+	u8				sreg_data;
+	bool				invert;
+	bool				expr;
+	u8				num_exprs;
+	u64				timeout;
+	struct nft_expr			*expr_array[NFT_SET_EXPR_MAX];
+	struct nft_set_binding		binding;
+};
+
+static int nft_dynset_expr_setup(const struct nft_dynset *priv,
+				 const struct nft_set_ext *ext)
+{
+	struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
+	struct nft_expr *expr;
+	int i;
+
+	for (i = 0; i < priv->num_exprs; i++) {
+		expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
+		if (nft_expr_clone(expr, priv->expr_array[i]) < 0)
+			return -1;
+
+		elem_expr->size += priv->expr_array[i]->ops->size;
+	}
+
+	return 0;
+}
+
+static void *nft_dynset_new(struct nft_set *set, const struct nft_expr *expr,
+			    struct nft_regs *regs)
+{
+	const struct nft_dynset *priv = nft_expr_priv(expr);
+	struct nft_set_ext *ext;
+	u64 timeout;
+	void *elem;
+
+	if (!atomic_add_unless(&set->nelems, 1, set->size))
+		return NULL;
+
+	timeout = priv->timeout ? : set->timeout;
+	elem = nft_set_elem_init(set, &priv->tmpl,
+				 &regs->data[priv->sreg_key], NULL,
+				 &regs->data[priv->sreg_data],
+				 timeout, 0, GFP_ATOMIC);
+	if (IS_ERR(elem))
+		goto err1;
+
+	ext = nft_set_elem_ext(set, elem);
+	if (priv->num_exprs && nft_dynset_expr_setup(priv, ext) < 0)
+		goto err2;
+
+	return elem;
+
+err2:
+	nft_set_elem_destroy(set, elem, false);
+err1:
+	if (set->size)
+		atomic_dec(&set->nelems);
+	return NULL;
+}
+
+void nft_dynset_eval(const struct nft_expr *expr,
+		     struct nft_regs *regs, const struct nft_pktinfo *pkt)
+{
+	const struct nft_dynset *priv = nft_expr_priv(expr);
+	struct nft_set *set = priv->set;
+	const struct nft_set_ext *ext;
+	u64 timeout;
+
+	if (priv->op == NFT_DYNSET_OP_DELETE) {
+		set->ops->delete(set, &regs->data[priv->sreg_key]);
+		return;
+	}
+
+	if (set->ops->update(set, &regs->data[priv->sreg_key], nft_dynset_new,
+			     expr, regs, &ext)) {
+		if (priv->op == NFT_DYNSET_OP_UPDATE &&
+		    nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
+			timeout = priv->timeout ? : set->timeout;
+			*nft_set_ext_expiration(ext) = get_jiffies_64() + timeout;
+		}
+
+		nft_set_elem_update_expr(ext, regs, pkt);
+
+		if (priv->invert)
+			regs->verdict.code = NFT_BREAK;
+		return;
+	}
+
+	if (!priv->invert)
+		regs->verdict.code = NFT_BREAK;
+}
+
+static void nft_dynset_ext_add_expr(struct nft_dynset *priv)
+{
+	u8 size = 0;
+	int i;
+
+	for (i = 0; i < priv->num_exprs; i++)
+		size += priv->expr_array[i]->ops->size;
+
+	nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_EXPRESSIONS,
+			       sizeof(struct nft_set_elem_expr) + size);
+}
+
+static struct nft_expr *
+nft_dynset_expr_alloc(const struct nft_ctx *ctx, const struct nft_set *set,
+		      const struct nlattr *attr, int pos)
+{
+	struct nft_expr *expr;
+	int err;
+
+	expr = nft_set_elem_expr_alloc(ctx, set, attr);
+	if (IS_ERR(expr))
+		return expr;
+
+	if (set->exprs[pos] && set->exprs[pos]->ops != expr->ops) {
+		err = -EOPNOTSUPP;
+		goto err_dynset_expr;
+	}
+
+	return expr;
+
+err_dynset_expr:
+	nft_expr_destroy(ctx, expr);
+	return ERR_PTR(err);
+}
+
+static const struct nla_policy nft_dynset_policy[NFTA_DYNSET_MAX + 1] = {
+	[NFTA_DYNSET_SET_NAME]	= { .type = NLA_STRING,
+				    .len = NFT_SET_MAXNAMELEN - 1 },
+	[NFTA_DYNSET_SET_ID]	= { .type = NLA_U32 },
+	[NFTA_DYNSET_OP]	= { .type = NLA_U32 },
+	[NFTA_DYNSET_SREG_KEY]	= { .type = NLA_U32 },
+	[NFTA_DYNSET_SREG_DATA]	= { .type = NLA_U32 },
+	[NFTA_DYNSET_TIMEOUT]	= { .type = NLA_U64 },
+	[NFTA_DYNSET_EXPR]	= { .type = NLA_NESTED },
+	[NFTA_DYNSET_FLAGS]	= { .type = NLA_U32 },
+	[NFTA_DYNSET_EXPRESSIONS] = { .type = NLA_NESTED },
+};
+
+static int nft_dynset_init(const struct nft_ctx *ctx,
+			   const struct nft_expr *expr,
+			   const struct nlattr * const tb[])
+{
+	struct nftables_pernet *nft_net = nft_pernet(ctx->net);
+	struct nft_dynset *priv = nft_expr_priv(expr);
+	u8 genmask = nft_genmask_next(ctx->net);
+	struct nft_set *set;
+	u64 timeout;
+	int err, i;
+
+	lockdep_assert_held(&nft_net->commit_mutex);
+
+	if (tb[NFTA_DYNSET_SET_NAME] == NULL ||
+	    tb[NFTA_DYNSET_OP] == NULL ||
+	    tb[NFTA_DYNSET_SREG_KEY] == NULL)
+		return -EINVAL;
+
+	if (tb[NFTA_DYNSET_FLAGS]) {
+		u32 flags = ntohl(nla_get_be32(tb[NFTA_DYNSET_FLAGS]));
+		if (flags & ~(NFT_DYNSET_F_INV | NFT_DYNSET_F_EXPR))
+			return -EOPNOTSUPP;
+		if (flags & NFT_DYNSET_F_INV)
+			priv->invert = true;
+		if (flags & NFT_DYNSET_F_EXPR)
+			priv->expr = true;
+	}
+
+	set = nft_set_lookup_global(ctx->net, ctx->table,
+				    tb[NFTA_DYNSET_SET_NAME],
+				    tb[NFTA_DYNSET_SET_ID], genmask);
+	if (IS_ERR(set))
+		return PTR_ERR(set);
+
+	if (set->flags & NFT_SET_OBJECT)
+		return -EOPNOTSUPP;
+
+	if (set->ops->update == NULL)
+		return -EOPNOTSUPP;
+
+	if (set->flags & NFT_SET_CONSTANT)
+		return -EBUSY;
+
+	priv->op = ntohl(nla_get_be32(tb[NFTA_DYNSET_OP]));
+	if (priv->op > NFT_DYNSET_OP_DELETE)
+		return -EOPNOTSUPP;
+
+	timeout = 0;
+	if (tb[NFTA_DYNSET_TIMEOUT] != NULL) {
+		if (!(set->flags & NFT_SET_TIMEOUT))
+			return -EOPNOTSUPP;
+
+		err = nf_msecs_to_jiffies64(tb[NFTA_DYNSET_TIMEOUT], &timeout);
+		if (err)
+			return err;
+	}
+
+	err = nft_parse_register_load(tb[NFTA_DYNSET_SREG_KEY], &priv->sreg_key,
+				      set->klen);
+	if (err < 0)
+		return err;
+
+	if (tb[NFTA_DYNSET_SREG_DATA] != NULL) {
+		if (!(set->flags & NFT_SET_MAP))
+			return -EOPNOTSUPP;
+		if (set->dtype == NFT_DATA_VERDICT)
+			return -EOPNOTSUPP;
+
+		err = nft_parse_register_load(tb[NFTA_DYNSET_SREG_DATA],
+					      &priv->sreg_data, set->dlen);
+		if (err < 0)
+			return err;
+	} else if (set->flags & NFT_SET_MAP)
+		return -EINVAL;
+
+	if ((tb[NFTA_DYNSET_EXPR] || tb[NFTA_DYNSET_EXPRESSIONS]) &&
+	    !(set->flags & NFT_SET_EVAL))
+		return -EINVAL;
+
+	if (tb[NFTA_DYNSET_EXPR]) {
+		struct nft_expr *dynset_expr;
+
+		dynset_expr = nft_dynset_expr_alloc(ctx, set,
+						    tb[NFTA_DYNSET_EXPR], 0);
+		if (IS_ERR(dynset_expr))
+			return PTR_ERR(dynset_expr);
+
+		priv->num_exprs++;
+		priv->expr_array[0] = dynset_expr;
+
+		if (set->num_exprs > 1 ||
+		    (set->num_exprs == 1 &&
+		     dynset_expr->ops != set->exprs[0]->ops)) {
+			err = -EOPNOTSUPP;
+			goto err_expr_free;
+		}
+	} else if (tb[NFTA_DYNSET_EXPRESSIONS]) {
+		struct nft_expr *dynset_expr;
+		struct nlattr *tmp;
+		int left;
+
+		if (!priv->expr)
+			return -EINVAL;
+
+		i = 0;
+		nla_for_each_nested(tmp, tb[NFTA_DYNSET_EXPRESSIONS], left) {
+			if (i == NFT_SET_EXPR_MAX) {
+				err = -E2BIG;
+				goto err_expr_free;
+			}
+			if (nla_type(tmp) != NFTA_LIST_ELEM) {
+				err = -EINVAL;
+				goto err_expr_free;
+			}
+			dynset_expr = nft_dynset_expr_alloc(ctx, set, tmp, i);
+			if (IS_ERR(dynset_expr)) {
+				err = PTR_ERR(dynset_expr);
+				goto err_expr_free;
+			}
+			priv->expr_array[i] = dynset_expr;
+			priv->num_exprs++;
+
+			if (set->num_exprs) {
+				if (i >= set->num_exprs) {
+					err = -EINVAL;
+					goto err_expr_free;
+				}
+				if (dynset_expr->ops != set->exprs[i]->ops) {
+					err = -EOPNOTSUPP;
+					goto err_expr_free;
+				}
+			}
+			i++;
+		}
+		if (set->num_exprs && set->num_exprs != i) {
+			err = -EOPNOTSUPP;
+			goto err_expr_free;
+		}
+	} else if (set->num_exprs > 0) {
+		err = nft_set_elem_expr_clone(ctx, set, priv->expr_array);
+		if (err < 0)
+			return err;
+
+		priv->num_exprs = set->num_exprs;
+	}
+
+	nft_set_ext_prepare(&priv->tmpl);
+	nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_KEY, set->klen);
+	if (set->flags & NFT_SET_MAP)
+		nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_DATA, set->dlen);
+
+	if (priv->num_exprs)
+		nft_dynset_ext_add_expr(priv);
+
+	if (set->flags & NFT_SET_TIMEOUT) {
+		if (timeout || set->timeout) {
+			nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_TIMEOUT);
+			nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_EXPIRATION);
+		}
+	}
+
+	priv->timeout = timeout;
+
+	err = nf_tables_bind_set(ctx, set, &priv->binding);
+	if (err < 0)
+		goto err_expr_free;
+
+	if (set->size == 0)
+		set->size = 0xffff;
+
+	priv->set = set;
+	return 0;
+
+err_expr_free:
+	for (i = 0; i < priv->num_exprs; i++)
+		nft_expr_destroy(ctx, priv->expr_array[i]);
+	return err;
+}
+
+static void nft_dynset_deactivate(const struct nft_ctx *ctx,
+				  const struct nft_expr *expr,
+				  enum nft_trans_phase phase)
+{
+	struct nft_dynset *priv = nft_expr_priv(expr);
+
+	nf_tables_deactivate_set(ctx, priv->set, &priv->binding, phase);
+}
+
+static void nft_dynset_activate(const struct nft_ctx *ctx,
+				const struct nft_expr *expr)
+{
+	struct nft_dynset *priv = nft_expr_priv(expr);
+
+	nf_tables_activate_set(ctx, priv->set);
+}
+
+static void nft_dynset_destroy(const struct nft_ctx *ctx,
+			       const struct nft_expr *expr)
+{
+	struct nft_dynset *priv = nft_expr_priv(expr);
+	int i;
+
+	for (i = 0; i < priv->num_exprs; i++)
+		nft_expr_destroy(ctx, priv->expr_array[i]);
+
+	nf_tables_destroy_set(ctx, priv->set);
+}
+
+static int nft_dynset_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+	const struct nft_dynset *priv = nft_expr_priv(expr);
+	u32 flags = priv->invert ? NFT_DYNSET_F_INV : 0;
+	int i;
+
+	if (nft_dump_register(skb, NFTA_DYNSET_SREG_KEY, priv->sreg_key))
+		goto nla_put_failure;
+	if (priv->set->flags & NFT_SET_MAP &&
+	    nft_dump_register(skb, NFTA_DYNSET_SREG_DATA, priv->sreg_data))
+		goto nla_put_failure;
+	if (nla_put_be32(skb, NFTA_DYNSET_OP, htonl(priv->op)))
+		goto nla_put_failure;
+	if (nla_put_string(skb, NFTA_DYNSET_SET_NAME, priv->set->name))
+		goto nla_put_failure;
+	if (nla_put_be64(skb, NFTA_DYNSET_TIMEOUT,
+			 nf_jiffies64_to_msecs(priv->timeout),
+			 NFTA_DYNSET_PAD))
+		goto nla_put_failure;
+	if (priv->set->num_exprs == 0) {
+		if (priv->num_exprs == 1) {
+			if (nft_expr_dump(skb, NFTA_DYNSET_EXPR,
+					  priv->expr_array[0]))
+				goto nla_put_failure;
+		} else if (priv->num_exprs > 1) {
+			struct nlattr *nest;
+
+			nest = nla_nest_start_noflag(skb, NFTA_DYNSET_EXPRESSIONS);
+			if (!nest)
+				goto nla_put_failure;
+
+			for (i = 0; i < priv->num_exprs; i++) {
+				if (nft_expr_dump(skb, NFTA_LIST_ELEM,
+						  priv->expr_array[i]))
+					goto nla_put_failure;
+			}
+			nla_nest_end(skb, nest);
+		}
+	}
+	if (nla_put_be32(skb, NFTA_DYNSET_FLAGS, htonl(flags)))
+		goto nla_put_failure;
+	return 0;
+
+nla_put_failure:
+	return -1;
+}
+
+static const struct nft_expr_ops nft_dynset_ops = {
+	.type		= &nft_dynset_type,
+	.size		= NFT_EXPR_SIZE(sizeof(struct nft_dynset)),
+	.eval		= nft_dynset_eval,
+	.init		= nft_dynset_init,
+	.destroy	= nft_dynset_destroy,
+	.activate	= nft_dynset_activate,
+	.deactivate	= nft_dynset_deactivate,
+	.dump		= nft_dynset_dump,
+	.reduce		= NFT_REDUCE_READONLY,
+};
+
+struct nft_expr_type nft_dynset_type __read_mostly = {
+	.name		= "dynset",
+	.ops		= &nft_dynset_ops,
+	.policy		= nft_dynset_policy,
+	.maxattr	= NFTA_DYNSET_MAX,
+	.owner		= THIS_MODULE,
+};