1// SPDX-License-Identifier: GPL-2.0
  2#include <stdio.h>
  3#include <assert.h>
  4#include <bpf/bpf.h>
  5#include <bpf/libbpf.h>
  6#include "sock_example.h"
  7#include <unistd.h>
  8#include <arpa/inet.h>
  9#include <sys/resource.h>
 10
 11struct flow_key_record {
 12	__be32 src;
 13	__be32 dst;
 14	union {
 15		__be32 ports;
 16		__be16 port16[2];
 17	};
 18	__u32 ip_proto;
 19};
 20
 21struct pair {
 22	__u64 packets;
 23	__u64 bytes;
 24};
 25
 26int main(int argc, char **argv)
 27{
 28	int i, sock, key, fd, main_prog_fd, jmp_table_fd, hash_map_fd;
 29	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
 30	struct bpf_program *prog;
 31	struct bpf_object *obj;
 32	char filename[256];
 33	const char *title;
 34	FILE *f;
 35
 36	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
 37	setrlimit(RLIMIT_MEMLOCK, &r);
 38
 39	obj = bpf_object__open_file(filename, NULL);
 40	if (libbpf_get_error(obj)) {
 41		fprintf(stderr, "ERROR: opening BPF object file failed\n");
 42		return 0;
 43	}
 44
 45	/* load BPF program */
 46	if (bpf_object__load(obj)) {
 47		fprintf(stderr, "ERROR: loading BPF object file failed\n");
 48		goto cleanup;
 49	}
 50
 51	jmp_table_fd = bpf_object__find_map_fd_by_name(obj, "jmp_table");
 52	hash_map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map");
 53	if (jmp_table_fd < 0 || hash_map_fd < 0) {
 54		fprintf(stderr, "ERROR: finding a map in obj file failed\n");
 55		goto cleanup;
 56	}
 57
 58	bpf_object__for_each_program(prog, obj) {
 59		fd = bpf_program__fd(prog);
 60
 61		title = bpf_program__title(prog, false);
 62		if (sscanf(title, "socket/%d", &key) != 1) {
 63			fprintf(stderr, "ERROR: finding prog failed\n");
 64			goto cleanup;
 65		}
 66
 67		if (key == 0)
 68			main_prog_fd = fd;
 69		else
 70			bpf_map_update_elem(jmp_table_fd, &key, &fd, BPF_ANY);
 71	}
 72
 73	sock = open_raw_sock("lo");
 74
 75	/* attach BPF program to socket */
 76	assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &main_prog_fd,
 77			  sizeof(__u32)) == 0);
 78
 79	if (argc > 1)
 80		f = popen("ping -4 -c5 localhost", "r");
 81	else
 82		f = popen("netperf -l 4 localhost", "r");
 83	(void) f;
 84
 85	for (i = 0; i < 5; i++) {
 86		struct flow_key_record key = {}, next_key;
 87		struct pair value;
 88
 89		sleep(1);
 90		printf("IP     src.port -> dst.port               bytes      packets\n");
 91		while (bpf_map_get_next_key(hash_map_fd, &key, &next_key) == 0) {
 92			bpf_map_lookup_elem(hash_map_fd, &next_key, &value);
 93			printf("%s.%05d -> %s.%05d %12lld %12lld\n",
 94			       inet_ntoa((struct in_addr){htonl(next_key.src)}),
 95			       next_key.port16[0],
 96			       inet_ntoa((struct in_addr){htonl(next_key.dst)}),
 97			       next_key.port16[1],
 98			       value.bytes, value.packets);
 99			key = next_key;
100		}
101	}
102
103cleanup:
104	bpf_object__close(obj);
105	return 0;
106}