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UPSTREAM: bpf: Relax max_entries check for most of the inner map types

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Most of the maps do not use max_entries during verification time.
Thus, those map_meta_equal() do not need to enforce max_entries
when it is inserted as an inner map during runtime.  The max_entries
check is removed from the default implementation bpf_map_meta_equal().

The prog_array_map and xsk_map are exception.  Its map_gen_lookup
uses max_entries to generate inline lookup code.  Thus, they will
implement its own map_meta_equal() to enforce max_entries.
Since there are only two cases now, the max_entries check
is not refactored and stays in its own .c file.

Change-Id: Ia9237dbb7ec03f8c9271bb9ac818d910d12fee5a
Signed-off-by: Martin KaFai Lau <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
This commit is contained in:
Martin KaFai Lau 2020-08-27 18:18:13 -07:00 • committed by basamaryan
commit f8e25db0fd
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3 changed files with 17 additions and 4 deletions
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9
net/xdp/xskmap.c
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@ -254,9 +254,16 @@ void xsk_map_try_sock_delete(struct xsk_map *map, struct xdp_sock *xs,
spin_unlock_bh(&map->lock);
}
static bool xsk_map_meta_equal(const struct bpf_map *meta0,
const struct bpf_map *meta1)
{
return meta0->max_entries == meta1->max_entries &&
bpf_map_meta_equal(meta0, meta1);
}
static int xsk_map_btf_id;
const struct bpf_map_ops xsk_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_meta_equal = xsk_map_meta_equal,
.map_alloc = xsk_map_alloc,
.map_free = xsk_map_free,
.map_get_next_key = xsk_map_get_next_key,