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, key, fd, main_prog_fd, jmp_table_fd, hash_map_fd; 28 struct bpf_program *prog; 29 struct bpf_object *obj; 30 const char *section; 31 char filename[256]; 32 FILE *f; 33 34 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 35 36 obj = bpf_object__open_file(filename, NULL); 37 if (libbpf_get_error(obj)) { 38 fprintf(stderr, "ERROR: opening BPF object file failed\n"); 39 return 0; 40 } 41 42 /* load BPF program */ 43 if (bpf_object__load(obj)) { 44 fprintf(stderr, "ERROR: loading BPF object file failed\n"); 45 goto cleanup; 46 } 47 48 jmp_table_fd = bpf_object__find_map_fd_by_name(obj, "jmp_table"); 49 hash_map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map"); 50 if (jmp_table_fd < 0 || hash_map_fd < 0) { 51 fprintf(stderr, "ERROR: finding a map in obj file failed\n"); 52 goto cleanup; 53 } 54 55 bpf_object__for_each_program(prog, obj) { 56 fd = bpf_program__fd(prog); 57 58 section = bpf_program__section_name(prog); 59 if (sscanf(section, "socket/%d", &key) != 1) { 60 fprintf(stderr, "ERROR: finding prog failed\n"); 61 goto cleanup; 62 } 63 64 if (key == 0) 65 main_prog_fd = fd; 66 else 67 bpf_map_update_elem(jmp_table_fd, &key, &fd, BPF_ANY); 68 } 69 70 sock = open_raw_sock("lo"); 71 72 /* attach BPF program to socket */ 73 assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &main_prog_fd, 74 sizeof(__u32)) == 0); 75 76 if (argc > 1) 77 f = popen("ping -4 -c5 localhost", "r"); 78 else 79 f = popen("netperf -l 4 localhost", "r"); 80 (void) f; 81 82 for (i = 0; i < 5; i++) { 83 struct flow_key_record key = {}, next_key; 84 struct pair value; 85 86 sleep(1); 87 printf("IP src.port -> dst.port bytes packets\n"); 88 while (bpf_map_get_next_key(hash_map_fd, &key, &next_key) == 0) { 89 bpf_map_lookup_elem(hash_map_fd, &next_key, &value); 90 printf("%s.%05d -> %s.%05d %12lld %12lld\n", 91 inet_ntoa((struct in_addr){htonl(next_key.src)}), 92 next_key.port16[0], 93 inet_ntoa((struct in_addr){htonl(next_key.dst)}), 94 next_key.port16[1], 95 value.bytes, value.packets); 96 key = next_key; 97 } 98 } 99 100 cleanup: 101 bpf_object__close(obj); 102 return 0; 103 } 104