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authorPablo Neira Ayuso <pablo@netfilter.org>2021-04-27 19:05:55 +0300
committerPablo Neira Ayuso <pablo@netfilter.org>2021-04-27 19:06:29 +0300
commitaaa31047a6d25da0fa101da1ed544e1247949b40 (patch)
tree50b2e539574a2e9b3c99332593e2d5ea8490809b /include/net
parent97c976d662fb9080a6a5d1e1a108c7a1f5c9484d (diff)
downloadlinux-aaa31047a6d25da0fa101da1ed544e1247949b40.tar.xz
netfilter: nftables: add catch-all set element support
This patch extends the set infrastructure to add a special catch-all set element. If the lookup fails to find an element (or range) in the set, then the catch-all element is selected. Users can specify a mapping, expression(s) and timeout to be attached to the catch-all element. This patch adds a catchall list to the set, this list might contain more than one single catch-all element (e.g. in case that the catch-all element is removed and a new one is added in the same transaction). However, most of the time, there will be either one element or no elements at all in this list. The catch-all element is identified via NFT_SET_ELEM_CATCHALL flag and such special element has no NFTA_SET_ELEM_KEY attribute. There is a new nft_set_elem_catchall object that stores a reference to the dummy catch-all element (catchall->elem) whose layout is the same of the set element type to reuse the existing set element codebase. The set size does not apply to the catch-all element, users can define a catch-all element even if the set is full. The check for valid set element flags hava been updates to report EOPNOTSUPP in case userspace requests flags that are not supported when using new userspace nftables and old kernel. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/netfilter/nf_tables.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index eb708b77c4a5..27eeb613bb4e 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -497,6 +497,7 @@ struct nft_set {
u8 dlen;
u8 num_exprs;
struct nft_expr *exprs[NFT_SET_EXPR_MAX];
+ struct list_head catchall_list;
unsigned char data[]
__attribute__((aligned(__alignof__(u64))));
};
@@ -522,6 +523,10 @@ struct nft_set *nft_set_lookup_global(const struct net *net,
const struct nlattr *nla_set_id,
u8 genmask);
+struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
+ const struct nft_set *set);
+void *nft_set_catchall_gc(const struct nft_set *set);
+
static inline unsigned long nft_set_gc_interval(const struct nft_set *set)
{
return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ;