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