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 rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; 30 struct bpf_program *prog; 31 struct bpf_object *obj; 32 const char *section; 33 char filename[256]; 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 section = bpf_program__section_name(prog); 62 if (sscanf(section, "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 } 102 103 cleanup: 104 bpf_object__close(obj); 105 return 0; 106 } 107