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netfilter: nftables: add catch-all set element support
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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>
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ummakynes committed Apr 27, 2021
1 parent 97c976d commit aaa3104
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Showing 8 changed files with 465 additions and 63 deletions.
5 changes: 5 additions & 0 deletions include/net/netfilter/nf_tables.h
Original file line number Diff line number Diff line change
Expand Up @@ -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))));
};
Expand All @@ -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;
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2 changes: 2 additions & 0 deletions include/uapi/linux/netfilter/nf_tables.h
Original file line number Diff line number Diff line change
Expand Up @@ -398,9 +398,11 @@ enum nft_set_attributes {
* enum nft_set_elem_flags - nf_tables set element flags
*
* @NFT_SET_ELEM_INTERVAL_END: element ends the previous interval
* @NFT_SET_ELEM_CATCHALL: special catch-all element
*/
enum nft_set_elem_flags {
NFT_SET_ELEM_INTERVAL_END = 0x1,
NFT_SET_ELEM_CATCHALL = 0x2,
};

/**
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