netdev - [PATCH net-next] Add uid and cookie bpf helper to cg_skb_func

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Message-Id: <1492211534-6363-1-git-send-email-chenbofeng.kernel@gmail.com>
Date:   Fri, 14 Apr 2017 16:12:14 -0700
From:   Chenbo Feng <chenbofeng.kernel@...il.com>
To:     netdev@...r.kernel.org, Lorenzo Colitti <lorenzo@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>
Cc:     Chenbo Feng <fengc@...gle.com>
Subject: [PATCH net-next] Add uid and cookie bpf helper to cg_skb_func_proto

From: Chenbo Feng <fengc@...gle.com>

BPF helper functions get_socket_cookie and get_socket_uid can be
used for network traffic classifications, among others. Expose
them also to programs of type BPF_PROG_TYPE_CGROUP_SKB. As of
commit 8f917bba0042 ("bpf: pass sk to helper functions") the required
skb->sk function is available at both cgroup bpf ingress and egress
hooks.

Signed-off-by: Chenbo Feng <fengc@...gle.com>
---
 net/core/filter.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/core/filter.c b/net/core/filter.c
index ce2a19d..b6db9e330 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -2769,6 +2769,10 @@ cg_skb_func_proto(enum bpf_func_id func_id)
 	switch (func_id) {
 	case BPF_FUNC_skb_load_bytes:
 		return &bpf_skb_load_bytes_proto;
+	case BPF_FUNC_get_socket_cookie:
+		return &bpf_get_socket_cookie_proto;
+	case BPF_FUNC_get_socket_uid:
+		return &bpf_get_socket_uid_proto;
 	default:
 		return bpf_base_func_proto(func_id);
 	}
-- 
2.7.4