From: Jakub Sitnicki <jakub@cloudflare.com>
Date: Tue, 18 Feb 2020 17:10:19 +0000
Subject: bpf, sockmap: Let all kernel-land lookup values in SOCKMAP/SOCKHASH
Patch-mainline: v5.7-rc1
Git-commit: 1d59f3bcee356caa933646dc45ff0836455535e8
References: bsc#1177028
Don't require the kernel code, like BPF helpers, that needs access to
SOCK{MAP,HASH} map contents to live in net/core/sock_map.c. Expose the
lookup operation to all kernel-land.
Lookup from BPF context is not whitelisted yet. While syscalls have a
dedicated lookup handler.
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20200218171023.844439-8-jakub@cloudflare.com
Acked-by: Gary Lin <glin@suse.com>
---
net/core/sock_map.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/net/core/sock_map.c
+++ b/net/core/sock_map.c
@@ -301,7 +301,7 @@ static struct sock *__sock_map_lookup_el
static void *sock_map_lookup(struct bpf_map *map, void *key)
{
- return ERR_PTR(-EOPNOTSUPP);
+ return __sock_map_lookup_elem(map, *(u32 *)key);
}
static void *sock_map_lookup_sys(struct bpf_map *map, void *key)
@@ -991,6 +991,11 @@ static void *sock_hash_lookup_sys(struct
return &sk->sk_cookie;
}
+static void *sock_hash_lookup(struct bpf_map *map, void *key)
+{
+ return __sock_hash_lookup_elem(map, key);
+}
+
static void sock_hash_release_progs(struct bpf_map *map)
{
psock_progs_drop(&container_of(map, struct bpf_htab, map)->progs);
@@ -1079,7 +1084,7 @@ const struct bpf_map_ops sock_hash_ops =
.map_get_next_key = sock_hash_get_next_key,
.map_update_elem = sock_hash_update_elem,
.map_delete_elem = sock_hash_delete_elem,
- .map_lookup_elem = sock_map_lookup,
+ .map_lookup_elem = sock_hash_lookup,
.map_lookup_elem_sys_only = sock_hash_lookup_sys,
.map_release_uref = sock_hash_release_progs,
.map_check_btf = map_check_no_btf,