v4.19.13 snapshot.
diff --git a/samples/bpf/sockex3_user.c b/samples/bpf/sockex3_user.c
new file mode 100644
index 0000000..5ba3ae9
--- /dev/null
+++ b/samples/bpf/sockex3_user.c
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <assert.h>
+#include <linux/bpf.h>
+#include <bpf/bpf.h>
+#include "bpf_load.h"
+#include "sock_example.h"
+#include <unistd.h>
+#include <arpa/inet.h>
+#include <sys/resource.h>
+
+#define PARSE_IP 3
+#define PARSE_IP_PROG_FD (prog_fd[0])
+#define PROG_ARRAY_FD (map_fd[0])
+
+struct bpf_flow_keys {
+ __be32 src;
+ __be32 dst;
+ union {
+ __be32 ports;
+ __be16 port16[2];
+ };
+ __u32 ip_proto;
+};
+
+struct pair {
+ __u64 packets;
+ __u64 bytes;
+};
+
+int main(int argc, char **argv)
+{
+ struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
+ char filename[256];
+ FILE *f;
+ int i, sock, err, id, key = PARSE_IP;
+ struct bpf_prog_info info = {};
+ uint32_t info_len = sizeof(info);
+
+ snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+ setrlimit(RLIMIT_MEMLOCK, &r);
+
+ if (load_bpf_file(filename)) {
+ printf("%s", bpf_log_buf);
+ return 1;
+ }
+
+ /* Test fd array lookup which returns the id of the bpf_prog */
+ err = bpf_obj_get_info_by_fd(PARSE_IP_PROG_FD, &info, &info_len);
+ assert(!err);
+ err = bpf_map_lookup_elem(PROG_ARRAY_FD, &key, &id);
+ assert(!err);
+ assert(id == info.id);
+
+ sock = open_raw_sock("lo");
+
+ assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd[4],
+ sizeof(__u32)) == 0);
+
+ if (argc > 1)
+ f = popen("ping -c5 localhost", "r");
+ else
+ f = popen("netperf -l 4 localhost", "r");
+ (void) f;
+
+ for (i = 0; i < 5; i++) {
+ struct bpf_flow_keys key = {}, next_key;
+ struct pair value;
+
+ sleep(1);
+ printf("IP src.port -> dst.port bytes packets\n");
+ while (bpf_map_get_next_key(map_fd[2], &key, &next_key) == 0) {
+ bpf_map_lookup_elem(map_fd[2], &next_key, &value);
+ printf("%s.%05d -> %s.%05d %12lld %12lld\n",
+ inet_ntoa((struct in_addr){htonl(next_key.src)}),
+ next_key.port16[0],
+ inet_ntoa((struct in_addr){htonl(next_key.dst)}),
+ next_key.port16[1],
+ value.bytes, value.packets);
+ key = next_key;
+ }
+ }
+ return 0;
+}