netdev - [bpf PATCH] samples/bpf: all XDP samples should unload xdp/bpf prog on SIGTERM

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Date:   Wed, 15 Aug 2018 16:57:14 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Daniel Borkmann <borkmann@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     netdev@...r.kernel.org, jhsiao@...hat.com
Subject: [bpf PATCH] samples/bpf: all XDP samples should unload xdp/bpf prog
 on SIGTERM

It is common XDP practice to unload/deattach the XDP bpf program,
when the XDP sample program is Ctrl-C interrupted (SIGINT) or
killed (SIGTERM).

The samples/bpf programs xdp_redirect_cpu and xdp_rxq_info,
forgot to trap signal SIGTERM (which is the default signal used
by the kill command).

This was discovered by Red Hat QA, which automated scripts depend
on killing the XDP sample program after a timeout period.

Fixes: fad3917e361b ("samples/bpf: add cpumap sample program xdp_redirect_cpu")
Fixes: 0fca931a6f21 ("samples/bpf: program demonstrating access to xdp_rxq_info")
Reported-by: Jean-Tsung Hsiao <jhsiao@...hat.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
---
 samples/bpf/xdp_redirect_cpu_user.c |    3 ++-
 samples/bpf/xdp_rxq_info_user.c     |    3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/samples/bpf/xdp_redirect_cpu_user.c b/samples/bpf/xdp_redirect_cpu_user.c
index 9a6c7e0a6dd1..2d23054aaccf 100644
--- a/samples/bpf/xdp_redirect_cpu_user.c
+++ b/samples/bpf/xdp_redirect_cpu_user.c
@@ -679,8 +679,9 @@ int main(int argc, char **argv)
 		return EXIT_FAIL_OPTION;
 	}
 
-	/* Remove XDP program when program is interrupted */
+	/* Remove XDP program when program is interrupted or killed */
 	signal(SIGINT, int_exit);
+	signal(SIGTERM, int_exit);
 
 	if (bpf_set_link_xdp_fd(ifindex, prog_fd[prog_num], xdp_flags) < 0) {
 		fprintf(stderr, "link set xdp fd failed\n");
diff --git a/samples/bpf/xdp_rxq_info_user.c b/samples/bpf/xdp_rxq_info_user.c
index 248a7eab9531..ef26f882f92f 100644
--- a/samples/bpf/xdp_rxq_info_user.c
+++ b/samples/bpf/xdp_rxq_info_user.c
@@ -567,8 +567,9 @@ int main(int argc, char **argv)
 		exit(EXIT_FAIL_BPF);
 	}
 
-	/* Remove XDP program when program is interrupted */
+	/* Remove XDP program when program is interrupted or killed */
 	signal(SIGINT, int_exit);
+	signal(SIGTERM, int_exit);
 
 	if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
 		fprintf(stderr, "link set xdp fd failed\n");