netdev - [PATCH iproute2 3/3] ip vrf: Improve bpf error messages

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Date:   Thu,  5 Jan 2017 16:22:23 -0800
From:   David Ahern <dsa@...ulusnetworks.com>
To:     netdev@...r.kernel.org, stephen@...workplumber.org
Cc:     David Ahern <dsa@...ulusnetworks.com>
Subject: [PATCH iproute2 3/3] ip vrf: Improve bpf error messages

Next up a non-root user gets various bpf related error messages:

$ ip vrf exec mgmt bash
Failed to load BPF prog: 'Operation not permitted'
Kernel compiled with CGROUP_BPF enabled?

Catch the EPERM error and do not show the kernel config option.

Signed-off-by: David Ahern <dsa@...ulusnetworks.com>
---
 ip/ipvrf.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/ip/ipvrf.c b/ip/ipvrf.c
index dc8364a43a57..8bd99d6251f2 100644
--- a/ip/ipvrf.c
+++ b/ip/ipvrf.c
@@ -181,7 +181,11 @@ static int vrf_configure_cgroup(const char *path, int ifindex)
 	if (prog_fd < 0) {
 		fprintf(stderr, "Failed to load BPF prog: '%s'\n",
 			strerror(errno));
-		fprintf(stderr, "Kernel compiled with CGROUP_BPF enabled?\n");
+
+		if (errno != EPERM) {
+			fprintf(stderr,
+				"Kernel compiled with CGROUP_BPF enabled?\n");
+		}
 		goto out;
 	}
 
-- 
2.1.4