netdev - [RFC bpf-next 4/5] bpf: Allow selecting reuseport socket from a SOCKMAP

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Date:   Tue, 22 Oct 2019 13:37:29 +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 4/5] bpf: Allow selecting reuseport socket from a SOCKMAP

SOCKMAP now supports storing references to listening sockets. Nothing
keeps us from using it as array of sockets to select from in reuseport
programs. Whitelist the map type with the socket selection helper.

Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
---
 kernel/bpf/verifier.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 556e82f8869b..77319248e357 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -3648,7 +3648,8 @@ static int check_map_func_compatibility(struct bpf_verifier_env *env,
 		if (func_id != BPF_FUNC_sk_redirect_map &&
 		    func_id != BPF_FUNC_sock_map_update &&
 		    func_id != BPF_FUNC_map_delete_elem &&
-		    func_id != BPF_FUNC_msg_redirect_map)
+		    func_id != BPF_FUNC_msg_redirect_map &&
+		    func_id != BPF_FUNC_sk_select_reuseport)
 			goto error;
 		break;
 	case BPF_MAP_TYPE_SOCKHASH:
@@ -3729,7 +3730,8 @@ static int check_map_func_compatibility(struct bpf_verifier_env *env,
 			goto error;
 		break;
 	case BPF_FUNC_sk_select_reuseport:
-		if (map->map_type != BPF_MAP_TYPE_REUSEPORT_SOCKARRAY)
+		if (map->map_type != BPF_MAP_TYPE_REUSEPORT_SOCKARRAY &&
+		    map->map_type != BPF_MAP_TYPE_SOCKMAP)
 			goto error;
 		break;
 	case BPF_FUNC_map_peek_elem:
-- 
2.20.1