netdev - [RFC bpf-next 1/5] bpf, sockmap: Let BPF helpers use lookup operation on SOCKMAP

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Date:   Tue, 22 Oct 2019 13:37:26 +0200
From:   Jakub Sitnicki <jakub@...udflare.com>
To:     bpf@...r.kernel.org
Cc:     John Fastabend <john.fastabend@...il.com>,
        Martin KaFai Lau <kafai@...com>, netdev@...r.kernel.org,
        kernel-team@...udflare.com
Subject: [RFC bpf-next 1/5] bpf, sockmap: Let BPF helpers use lookup operation on SOCKMAP

Don't require the BPF helpers that need to access SOCKMAP maps to live in
the sock_map module. Expose SOCKMAP lookup to all kernel-land.

Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
---
 net/core/sock_map.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/core/sock_map.c b/net/core/sock_map.c
index eb114ee419b6..facacc296e6c 100644
--- a/net/core/sock_map.c
+++ b/net/core/sock_map.c
@@ -271,7 +271,9 @@ static struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key)
 
 static void *sock_map_lookup(struct bpf_map *map, void *key)
 {
-	return ERR_PTR(-EOPNOTSUPP);
+	u32 index = *(u32 *)key;
+
+	return __sock_map_lookup_elem(map, index);
 }
 
 static int __sock_map_delete(struct bpf_stab *stab, struct sock *sk_test,
-- 
2.20.1