@@ -196,6 +196,7 @@ struct nft_set_estimate {
};
struct nft_set_ext;
+struct nft_expr;
/**
* struct nft_set_ops - nf_tables set operations
@@ -218,6 +219,15 @@ struct nft_set_ops {
bool (*lookup)(const struct nft_set *set,
const struct nft_data *key,
const struct nft_set_ext **ext);
+ bool (*update)(struct nft_set *set,
+ const struct nft_data *key,
+ void *(*new)(struct nft_set *,
+ const struct nft_expr *,
+ struct nft_data []),
+ const struct nft_expr *expr,
+ struct nft_data data[],
+ const struct nft_set_ext **ext);
+
int (*insert)(const struct nft_set *set,
const struct nft_set_elem *elem);
void (*activate)(const struct nft_set *set,
@@ -466,6 +476,11 @@ static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set,
return elem + set->ops->elemsize;
}
+void *nft_set_elem_init(const struct nft_set *set,
+ const struct nft_set_ext_tmpl *tmpl,
+ const struct nft_data *key,
+ const struct nft_data *data,
+ u64 timeout, gfp_t gfp);
void nft_set_elem_destroy(const struct nft_set *set, void *elem);
/**
@@ -845,6 +860,8 @@ static inline u8 nft_genmask_cur(const struct net *net)
return 1 << ACCESS_ONCE(net->nft.gencursor);
}
+#define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
+
/*
* Set element transaction helpers
*/
@@ -31,6 +31,9 @@ void nft_cmp_module_exit(void);
int nft_lookup_module_init(void);
void nft_lookup_module_exit(void);
+int nft_dynset_module_init(void);
+void nft_dynset_module_exit(void);
+
int nft_bitwise_module_init(void);
void nft_bitwise_module_exit(void);
@@ -515,6 +515,33 @@ enum nft_lookup_attributes {
};
#define NFTA_LOOKUP_MAX (__NFTA_LOOKUP_MAX - 1)
+enum nft_dynset_ops {
+ NFT_DYNSET_OP_ADD,
+ NFT_DYNSET_OP_UPDATE,
+};
+
+/**
+ * enum nft_dynset_attributes - dynset expression attributes
+ *
+ * @NFTA_DYNSET_SET_NAME: name of set the to add data to (NLA_STRING)
+ * @NFTA_DYNSET_SET_ID: uniquely identifier of the set in the transaction (NLA_U32)
+ * @NFTA_DYNSET_OP: operation (NLA_U32)
+ * @NFTA_DYNSET_SREG_KEY: source register of the key (NLA_U32)
+ * @NFTA_DYNSET_SREG_DATA: source register of the data (NLA_U32)
+ * @NFTA_DYNSET_TIMEOUT: timeout value for the new element (NLA_U64)
+ */
+enum nft_dynset_attributes {
+ NFTA_DYNSET_UNSPEC,
+ NFTA_DYNSET_SET_NAME,
+ NFTA_DYNSET_SET_ID,
+ NFTA_DYNSET_OP,
+ NFTA_DYNSET_SREG_KEY,
+ NFTA_DYNSET_SREG_DATA,
+ NFTA_DYNSET_TIMEOUT,
+ __NFTA_DYNSET_MAX,
+};
+#define NFTA_DYNSET_MAX (__NFTA_DYNSET_MAX - 1)
+
/**
* enum nft_payload_bases - nf_tables payload expression offset bases
*
@@ -70,7 +70,7 @@ obj-$(CONFIG_NETFILTER_SYNPROXY) += nf_synproxy_core.o
# nf_tables
nf_tables-objs += nf_tables_core.o nf_tables_api.o
-nf_tables-objs += nft_immediate.o nft_cmp.o nft_lookup.o
+nf_tables-objs += nft_immediate.o nft_cmp.o nft_lookup.o nft_dynset.o
nf_tables-objs += nft_bitwise.o nft_byteorder.o nft_payload.o
obj-$(CONFIG_NF_TABLES) += nf_tables.o
@@ -3183,11 +3183,11 @@ static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
return trans;
}
-static void *nft_set_elem_init(const struct nft_set *set,
- const struct nft_set_ext_tmpl *tmpl,
- const struct nft_data *key,
- const struct nft_data *data,
- u64 timeout, gfp_t gfp)
+void *nft_set_elem_init(const struct nft_set *set,
+ const struct nft_set_ext_tmpl *tmpl,
+ const struct nft_data *key,
+ const struct nft_data *data,
+ u64 timeout, gfp_t gfp)
{
struct nft_set_ext *ext;
void *elem;
@@ -239,8 +239,14 @@ int __init nf_tables_core_module_init(void)
if (err < 0)
goto err6;
+ err = nft_dynset_module_init();
+ if (err < 0)
+ goto err7;
+
return 0;
+err7:
+ nft_payload_module_exit();
err6:
nft_byteorder_module_exit();
err5:
@@ -257,6 +263,7 @@ err1:
void nf_tables_core_module_exit(void)
{
+ nft_dynset_module_exit();
nft_payload_module_exit();
nft_byteorder_module_exit();
nft_bitwise_module_exit();
new file mode 100644
@@ -0,0 +1,218 @@
+/*
+ * Copyright (c) 2015 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#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;
+ enum nft_registers sreg_key:8;
+ enum nft_registers sreg_data:8;
+ u64 timeout;
+ struct nft_set_binding binding;
+};
+
+static void *nft_dynset_new(struct nft_set *set, const struct nft_expr *expr,
+ struct nft_data data[NFT_REG_MAX + 1])
+{
+ const struct nft_dynset *priv = nft_expr_priv(expr);
+ u64 timeout;
+ void *elem;
+
+ if (set->size && !atomic_add_unless(&set->nelems, 1, set->size))
+ return NULL;
+
+ timeout = priv->timeout ? : set->timeout;
+ elem = nft_set_elem_init(set, &priv->tmpl,
+ &data[priv->sreg_key], &data[priv->sreg_data],
+ timeout, GFP_ATOMIC);
+ if (elem == NULL) {
+ if (set->size)
+ atomic_dec(&set->nelems);
+ }
+ return elem;
+}
+
+static void nft_dynset_eval(const struct nft_expr *expr,
+ struct nft_data data[NFT_REG_MAX + 1],
+ 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 (set->ops->update(set, &data[priv->sreg_key], nft_dynset_new,
+ expr, data, &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) = jiffies + timeout;
+ return;
+ }
+ }
+
+ data[NFT_REG_VERDICT].verdict = NFT_BREAK;
+}
+
+static const struct nla_policy nft_dynset_policy[NFTA_DYNSET_MAX + 1] = {
+ [NFTA_DYNSET_SET_NAME] = { .type = NLA_STRING },
+ [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 },
+};
+
+static int nft_dynset_init(const struct nft_ctx *ctx,
+ const struct nft_expr *expr,
+ const struct nlattr * const tb[])
+{
+ struct nft_dynset *priv = nft_expr_priv(expr);
+ struct nft_set *set;
+ u64 timeout;
+ int err;
+
+ if (tb[NFTA_DYNSET_SET_NAME] == NULL ||
+ tb[NFTA_DYNSET_OP] == NULL ||
+ tb[NFTA_DYNSET_SREG_KEY] == NULL)
+ return -EINVAL;
+
+ set = nf_tables_set_lookup(ctx->table, tb[NFTA_DYNSET_SET_NAME]);
+ if (IS_ERR(set)) {
+ if (tb[NFTA_DYNSET_SET_ID])
+ set = nf_tables_set_lookup_byid(ctx->net,
+ tb[NFTA_DYNSET_SET_ID]);
+ if (IS_ERR(set))
+ return PTR_ERR(set);
+ }
+
+ if (set->flags & NFT_SET_CONSTANT)
+ return -EBUSY;
+
+ priv->op = ntohl(nla_get_be32(tb[NFTA_DYNSET_OP]));
+ switch (priv->op) {
+ case NFT_DYNSET_OP_ADD:
+ break;
+ case NFT_DYNSET_OP_UPDATE:
+ if (!(set->flags & NFT_SET_TIMEOUT))
+ return -EOPNOTSUPP;
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ timeout = 0;
+ if (tb[NFTA_DYNSET_TIMEOUT] != NULL) {
+ if (!(set->flags & NFT_SET_TIMEOUT))
+ return -EINVAL;
+ timeout = be64_to_cpu(nla_get_be64(tb[NFTA_DYNSET_TIMEOUT]));
+ }
+
+ priv->sreg_key = ntohl(nla_get_be32(tb[NFTA_DYNSET_SREG_KEY]));
+ err = nft_validate_input_register(priv->sreg_key);
+ if (err < 0)
+ return err;
+
+ if (tb[NFTA_DYNSET_SREG_DATA] != NULL) {
+ if (!(set->flags & NFT_SET_MAP))
+ return -EINVAL;
+ if (set->dtype == NFT_DATA_VERDICT)
+ return -EOPNOTSUPP;
+
+ priv->sreg_data = ntohl(nla_get_be32(tb[NFTA_DYNSET_SREG_DATA]));
+ err = nft_validate_input_register(priv->sreg_data);
+ if (err < 0)
+ return err;
+ } else if (set->flags & NFT_SET_MAP)
+ return -EINVAL;
+
+ 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 (set->flags & NFT_SET_TIMEOUT) {
+ if (timeout || set->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)
+ return err;
+
+ priv->set = set;
+ return 0;
+}
+
+static void nft_dynset_destroy(const struct nft_ctx *ctx,
+ const struct nft_expr *expr)
+{
+ struct nft_dynset *priv = nft_expr_priv(expr);
+
+ nf_tables_unbind_set(ctx, priv->set, &priv->binding);
+}
+
+static int nft_dynset_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+ const struct nft_dynset *priv = nft_expr_priv(expr);
+
+ if (nla_put_be32(skb, NFTA_DYNSET_SREG_KEY, htonl(priv->sreg_key)))
+ goto nla_put_failure;
+ if (priv->set->flags & NFT_SET_MAP &&
+ nla_put_be32(skb, NFTA_DYNSET_SREG_DATA, htonl(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, cpu_to_be64(priv->timeout)))
+ goto nla_put_failure;
+ return 0;
+
+nla_put_failure:
+ return -1;
+}
+
+static struct nft_expr_type nft_dynset_type;
+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,
+ .dump = nft_dynset_dump,
+};
+
+static 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,
+};
+
+int __init nft_dynset_module_init(void)
+{
+ return nft_register_expr(&nft_dynset_type);
+}
+
+void nft_dynset_module_exit(void)
+{
+ nft_unregister_expr(&nft_dynset_type);
+}
@@ -90,6 +90,42 @@ static bool nft_hash_lookup(const struct nft_set *set,
return !!he;
}
+static bool nft_hash_update(struct nft_set *set, const struct nft_data *key,
+ void *(*new)(struct nft_set *,
+ const struct nft_expr *,
+ struct nft_data []),
+ const struct nft_expr *expr,
+ struct nft_data data[],
+ const struct nft_set_ext **ext)
+{
+ struct nft_hash *priv = nft_set_priv(set);
+ struct nft_hash_elem *he;
+ struct nft_hash_cmp_arg arg = {
+ .genmask = NFT_GENMASK_ANY,
+ .set = set,
+ .key = key,
+ };
+
+ he = rhashtable_lookup_fast(&priv->ht, &arg, nft_hash_params);
+ if (he != NULL)
+ goto out;
+
+ he = new(set, expr, data);
+ if (he == NULL)
+ goto err1;
+ if (rhashtable_lookup_insert_key(&priv->ht, &arg, &he->node,
+ nft_hash_params))
+ goto err2;
+out:
+ *ext = &he->ext;
+ return true;
+
+err2:
+ nft_set_elem_destroy(set, he);
+err1:
+ return false;
+}
+
static int nft_hash_insert(const struct nft_set *set,
const struct nft_set_elem *elem)
{
@@ -335,6 +371,7 @@ static struct nft_set_ops nft_hash_ops __read_mostly = {
.deactivate = nft_hash_deactivate,
.remove = nft_hash_remove,
.lookup = nft_hash_lookup,
+ .update = nft_hash_update,
.walk = nft_hash_walk,
.features = NFT_SET_MAP | NFT_SET_TIMEOUT,
.owner = THIS_MODULE,