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 10 struct flow_key_record { 11 __be32 src; 12 __be32 dst; 13 union { 14 __be32 ports; 15 __be16 port16[2]; 16 }; 17 __u32 ip_proto; 18 }; 19 20 struct pair { 21 __u64 packets; 22 __u64 bytes; 23 }; 24 25 int main(int argc, char **argv) 26 { 27 int i, sock, fd, main_prog_fd, hash_map_fd; 28 struct bpf_program *prog; 29 struct bpf_object *obj; 30 char filename[256]; 31 FILE *f; 32 33 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 34 35 obj = bpf_object__open_file(filename, NULL); 36 if (libbpf_get_error(obj)) { 37 fprintf(stderr, "ERROR: opening BPF object file failed\n"); 38 return 0; 39 } 40 41 /* load BPF program */ 42 if (bpf_object__load(obj)) { 43 fprintf(stderr, "ERROR: loading BPF object file failed\n"); 44 goto cleanup; 45 } 46 47 hash_map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map"); 48 if (hash_map_fd < 0) { 49 fprintf(stderr, "ERROR: finding a map in obj file failed\n"); 50 goto cleanup; 51 } 52 53 /* find BPF main program */ 54 main_prog_fd = 0; 55 bpf_object__for_each_program(prog, obj) { 56 fd = bpf_program__fd(prog); 57 58 if (!strcmp(bpf_program__name(prog), "main_prog")) 59 main_prog_fd = fd; 60 } 61 62 if (main_prog_fd == 0) { 63 fprintf(stderr, "ERROR: can't find main_prog\n"); 64 goto cleanup; 65 } 66 67 sock = open_raw_sock("lo"); 68 69 /* attach BPF program to socket */ 70 assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &main_prog_fd, 71 sizeof(__u32)) == 0); 72 73 if (argc > 1) 74 f = popen("ping -4 -c5 localhost", "r"); 75 else 76 f = popen("netperf -l 4 localhost", "r"); 77 (void) f; 78 79 for (i = 0; i < 5; i++) { 80 struct flow_key_record key = {}, next_key; 81 struct pair value; 82 83 sleep(1); 84 printf("IP src.port -> dst.port bytes packets\n"); 85 while (bpf_map_get_next_key(hash_map_fd, &key, &next_key) == 0) { 86 bpf_map_lookup_elem(hash_map_fd, &next_key, &value); 87 printf("%s.%05d -> %s.%05d %12lld %12lld\n", 88 inet_ntoa((struct in_addr){htonl(next_key.src)}), 89 next_key.port16[0], 90 inet_ntoa((struct in_addr){htonl(next_key.dst)}), 91 next_key.port16[1], 92 value.bytes, value.packets); 93 key = next_key; 94 } 95 } 96 97 cleanup: 98 bpf_object__close(obj); 99 return 0; 100 } 101