From 7d5f7b0d47275b5b2fc671ae7b144e80eb356a52 Mon Sep 17 00:00:00 2001 From: Jakub Sitnicki Date: Tue, 18 Feb 2020 17:10:19 +0000 Subject: [PATCH] UPSTREAM: bpf, sockmap: Let all kernel-land lookup values in SOCKMAP/SOCKHASH 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. Change-Id: I30e9f4b4dd310f998e9d850b52d1ae1bae6af9ca Signed-off-by: Jakub Sitnicki Signed-off-by: Daniel Borkmann Acked-by: John Fastabend Link: https://lore.kernel.org/bpf/20200218171023.844439-8-jakub@cloudflare.com --- net/core/sock_map.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/net/core/sock_map.c b/net/core/sock_map.c index c34050dee998..969c7f0a8d3f 100644 --- a/net/core/sock_map.c +++ b/net/core/sock_map.c @@ -377,7 +377,7 @@ 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); + return __sock_map_lookup_elem(map, *(u32 *)key); } static void *sock_map_lookup_sys(struct bpf_map *map, void *key) @@ -1103,6 +1103,11 @@ static void *sock_hash_lookup_sys(struct bpf_map *map, void *key) 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); @@ -1191,7 +1196,7 @@ 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,