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-rw-r--r--samples/bpf/sockex3_user.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/samples/bpf/sockex3_user.c b/samples/bpf/sockex3_user.c
new file mode 100644
index 000000000..7793f6a6a
--- /dev/null
+++ b/samples/bpf/sockex3_user.c
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <assert.h>
+#include <bpf/bpf.h>
+#include <bpf/libbpf.h>
+#include "sock_example.h"
+#include <unistd.h>
+#include <arpa/inet.h>
+#include <sys/resource.h>
+
+struct flow_key_record {
+ __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)
+{
+ int i, sock, key, fd, main_prog_fd, jmp_table_fd, hash_map_fd;
+ struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
+ struct bpf_program *prog;
+ struct bpf_object *obj;
+ const char *section;
+ char filename[256];
+ FILE *f;
+
+ snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+ setrlimit(RLIMIT_MEMLOCK, &r);
+
+ obj = bpf_object__open_file(filename, NULL);
+ if (libbpf_get_error(obj)) {
+ fprintf(stderr, "ERROR: opening BPF object file failed\n");
+ return 0;
+ }
+
+ /* load BPF program */
+ if (bpf_object__load(obj)) {
+ fprintf(stderr, "ERROR: loading BPF object file failed\n");
+ goto cleanup;
+ }
+
+ jmp_table_fd = bpf_object__find_map_fd_by_name(obj, "jmp_table");
+ hash_map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map");
+ if (jmp_table_fd < 0 || hash_map_fd < 0) {
+ fprintf(stderr, "ERROR: finding a map in obj file failed\n");
+ goto cleanup;
+ }
+
+ bpf_object__for_each_program(prog, obj) {
+ fd = bpf_program__fd(prog);
+
+ section = bpf_program__section_name(prog);
+ if (sscanf(section, "socket/%d", &key) != 1) {
+ fprintf(stderr, "ERROR: finding prog failed\n");
+ goto cleanup;
+ }
+
+ if (key == 0)
+ main_prog_fd = fd;
+ else
+ bpf_map_update_elem(jmp_table_fd, &key, &fd, BPF_ANY);
+ }
+
+ sock = open_raw_sock("lo");
+
+ /* attach BPF program to socket */
+ assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &main_prog_fd,
+ sizeof(__u32)) == 0);
+
+ if (argc > 1)
+ f = popen("ping -4 -c5 localhost", "r");
+ else
+ f = popen("netperf -l 4 localhost", "r");
+ (void) f;
+
+ for (i = 0; i < 5; i++) {
+ struct flow_key_record key = {}, next_key;
+ struct pair value;
+
+ sleep(1);
+ printf("IP src.port -> dst.port bytes packets\n");
+ while (bpf_map_get_next_key(hash_map_fd, &key, &next_key) == 0) {
+ bpf_map_lookup_elem(hash_map_fd, &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;
+ }
+ }
+
+cleanup:
+ bpf_object__close(obj);
+ return 0;
+}