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https://github.com/torvalds/linux
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netfilter: nf_tables: add last expression
Add a new optional expression that tells you when last matching on a given rule / set element element has happened. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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06e95f0a2a
commit
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@ -16,6 +16,7 @@ extern struct nft_expr_type nft_range_type;
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extern struct nft_expr_type nft_meta_type;
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extern struct nft_expr_type nft_rt_type;
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extern struct nft_expr_type nft_exthdr_type;
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extern struct nft_expr_type nft_last_type;
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#ifdef CONFIG_NETWORK_SECMARK
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extern struct nft_object_type nft_secmark_obj_type;
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@ -1195,6 +1195,21 @@ enum nft_counter_attributes {
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};
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#define NFTA_COUNTER_MAX (__NFTA_COUNTER_MAX - 1)
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/**
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* enum nft_last_attributes - nf_tables last expression netlink attributes
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*
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* @NFTA_LAST_SET: last update has been set, zero means never updated (NLA_U32)
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* @NFTA_LAST_MSECS: milliseconds since last update (NLA_U64)
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*/
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enum nft_last_attributes {
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NFTA_LAST_UNSPEC,
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NFTA_LAST_SET,
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NFTA_LAST_MSECS,
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NFTA_LAST_PAD,
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__NFTA_LAST_MAX
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};
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#define NFTA_LAST_MAX (__NFTA_LAST_MAX - 1)
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/**
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* enum nft_log_attributes - nf_tables log expression netlink attributes
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*
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@ -74,7 +74,7 @@ obj-$(CONFIG_NF_DUP_NETDEV) += nf_dup_netdev.o
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nf_tables-objs := nf_tables_core.o nf_tables_api.o nft_chain_filter.o \
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nf_tables_trace.o nft_immediate.o nft_cmp.o nft_range.o \
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nft_bitwise.o nft_byteorder.o nft_payload.o nft_lookup.o \
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nft_dynset.o nft_meta.o nft_rt.o nft_exthdr.o \
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nft_dynset.o nft_meta.o nft_rt.o nft_exthdr.o nft_last.o \
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nft_chain_route.o nf_tables_offload.o \
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nft_set_hash.o nft_set_bitmap.o nft_set_rbtree.o \
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nft_set_pipapo.o
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@ -268,6 +268,7 @@ static struct nft_expr_type *nft_basic_types[] = {
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&nft_meta_type,
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&nft_rt_type,
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&nft_exthdr_type,
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&nft_last_type,
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};
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static struct nft_object_type *nft_basic_objects[] = {
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87
net/netfilter/nft_last.c
Normal file
87
net/netfilter/nft_last.c
Normal file
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@ -0,0 +1,87 @@
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// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.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_core.h>
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#include <net/netfilter/nf_tables.h>
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struct nft_last_priv {
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unsigned long last_jiffies;
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unsigned int last_set;
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};
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static const struct nla_policy nft_last_policy[NFTA_LAST_MAX + 1] = {
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[NFTA_LAST_SET] = { .type = NLA_U32 },
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[NFTA_LAST_MSECS] = { .type = NLA_U64 },
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};
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static int nft_last_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_last_priv *priv = nft_expr_priv(expr);
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u64 last_jiffies;
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int err;
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if (tb[NFTA_LAST_MSECS]) {
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err = nf_msecs_to_jiffies64(tb[NFTA_LAST_MSECS], &last_jiffies);
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if (err < 0)
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return err;
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priv->last_jiffies = jiffies + (unsigned long)last_jiffies;
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priv->last_set = 1;
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}
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return 0;
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}
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static void nft_last_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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struct nft_last_priv *priv = nft_expr_priv(expr);
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priv->last_jiffies = jiffies;
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priv->last_set = 1;
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}
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static int nft_last_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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struct nft_last_priv *priv = nft_expr_priv(expr);
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__be64 msecs;
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if (time_before(jiffies, priv->last_jiffies))
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priv->last_set = 0;
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if (priv->last_set)
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msecs = nf_jiffies64_to_msecs(jiffies - priv->last_jiffies);
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else
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msecs = 0;
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if (nla_put_be32(skb, NFTA_LAST_SET, htonl(priv->last_set)) ||
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nla_put_be64(skb, NFTA_LAST_MSECS, msecs, NFTA_LAST_PAD))
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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_last_ops = {
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.type = &nft_last_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_last_priv)),
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.eval = nft_last_eval,
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.init = nft_last_init,
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.dump = nft_last_dump,
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};
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struct nft_expr_type nft_last_type __read_mostly = {
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.name = "last",
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.ops = &nft_last_ops,
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.policy = nft_last_policy,
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.maxattr = NFTA_LAST_MAX,
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.flags = NFT_EXPR_STATEFUL,
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.owner = THIS_MODULE,
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};
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