samples/bpf: run cleanup routines when receiving SIGTERM

Shahid Habib noticed that when xdp1 was killed from a different console the xdp
program was not cleaned-up properly in the kernel and it continued to forward
traffic.

Most of the applications in samples/bpf cleanup properly, but only when getting
SIGINT.  Since kill defaults to using SIGTERM, add support to cleanup when the
application receives either SIGINT or SIGTERM.

Signed-off-by: Andy Gospodarek <andy@greyhouse.net>
Reported-by: Shahid Habib <shahid.habib@broadcom.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 9 insertions, 1 deletions

diff --git a/samples/bpf/cookie_uid_helper_example.c b/samples/bpf/cookie_uid_helper_example.c
index b08ab4e88929..9d751e209f31 100644
--- a/samples/bpf/cookie_uid_helper_example.c
+++ b/samples/bpf/cookie_uid_helper_example.c
@@ -306,7 +306,9 @@ int main(int argc, char *argv[])
         prog_attach_iptables(argv[2]);
         if (cfg_test_traffic) {
                 if (signal(SIGINT, finish) == SIG_ERR)
-                        error(1, errno, "register handler failed");
+                        error(1, errno, "register SIGINT handler failed");
+                if (signal(SIGTERM, finish) == SIG_ERR)
+                        error(1, errno, "register SIGTERM handler failed");
                 while (!test_finish) {
                         print_table();
                         printf("\n");
diff --git a/samples/bpf/offwaketime_user.c b/samples/bpf/offwaketime_user.c
index 9cce2a66bd66..512f87a5fd20 100644
--- a/samples/bpf/offwaketime_user.c
+++ b/samples/bpf/offwaketime_user.c
@@ -100,6 +100,7 @@ int main(int argc, char **argv)
         setrlimit(RLIMIT_MEMLOCK, &r);
 
         signal(SIGINT, int_exit);
+        signal(SIGTERM, int_exit);
 
         if (load_kallsyms()) {
                 printf("failed to process /proc/kallsyms\n");
diff --git a/samples/bpf/sampleip_user.c b/samples/bpf/sampleip_user.c
index be59d7dcbdde..4ed690b907ff 100644
--- a/samples/bpf/sampleip_user.c
+++ b/samples/bpf/sampleip_user.c
@@ -180,6 +180,7 @@ int main(int argc, char **argv)
                 return 1;
         }
         signal(SIGINT, int_exit);
+        signal(SIGTERM, int_exit);
 
         /* do sampling */
         printf("Sampling at %d Hertz for %d seconds. Ctrl-C also ends.\n",
diff --git a/samples/bpf/trace_event_user.c b/samples/bpf/trace_event_user.c
index 0c5561d193a4..fa4336423da5 100644
--- a/samples/bpf/trace_event_user.c
+++ b/samples/bpf/trace_event_user.c
@@ -192,6 +192,7 @@ int main(int argc, char **argv)
         setrlimit(RLIMIT_MEMLOCK, &r);
 
         signal(SIGINT, int_exit);
+        signal(SIGTERM, int_exit);
 
         if (load_kallsyms()) {
                 printf("failed to process /proc/kallsyms\n");
diff --git a/samples/bpf/tracex2_user.c b/samples/bpf/tracex2_user.c
index 7fee0f1ba9a3..7321a3f253c9 100644
--- a/samples/bpf/tracex2_user.c
+++ b/samples/bpf/tracex2_user.c
@@ -127,6 +127,7 @@ int main(int ac, char **argv)
         }
 
         signal(SIGINT, int_exit);
+        signal(SIGTERM, int_exit);
 
         /* start 'ping' in the background to have some kfree_skb events */
         f = popen("ping -c5 localhost", "r");
diff --git a/samples/bpf/xdp1_user.c b/samples/bpf/xdp1_user.c
index 17be9ea3ecb2..2431c0321b71 100644
--- a/samples/bpf/xdp1_user.c
+++ b/samples/bpf/xdp1_user.c
@@ -106,6 +106,7 @@ int main(int argc, char **argv)
         }
 
         signal(SIGINT, int_exit);
+        signal(SIGTERM, int_exit);
 
         if (set_link_xdp_fd(ifindex, prog_fd[0], xdp_flags) < 0) {
                 printf("link set xdp fd failed\n");
diff --git a/samples/bpf/xdp_tx_iptunnel_user.c b/samples/bpf/xdp_tx_iptunnel_user.c
index 631cdcc41c97..715cd12eaca5 100644
--- a/samples/bpf/xdp_tx_iptunnel_user.c
+++ b/samples/bpf/xdp_tx_iptunnel_user.c
@@ -244,6 +244,7 @@ int main(int argc, char **argv)
         }
 
         signal(SIGINT, int_exit);
+        signal(SIGTERM, int_exit);
 
         while (min_port <= max_port) {
                 vip.dport = htons(min_port++);