1 // SPDX-License-Identifier: GPL-2.0 2 #include <stdio.h> 3 #include <assert.h> 4 #include <linux/bpf.h> 5 #include <bpf/bpf.h> 6 #include "bpf_load.h" 7 #include "sock_example.h" 8 #include <unistd.h> 9 #include <arpa/inet.h> 10 #include <sys/resource.h> 11 12 #define PARSE_IP 3 13 #define PARSE_IP_PROG_FD (prog_fd[0]) 14 #define PROG_ARRAY_FD (map_fd[0]) 15 16 struct bpf_flow_keys { 17 __be32 src; 18 __be32 dst; 19 union { 20 __be32 ports; 21 __be16 port16[2]; 22 }; 23 __u32 ip_proto; 24 }; 25 26 struct pair { 27 __u64 packets; 28 __u64 bytes; 29 }; 30 31 int main(int argc, char **argv) 32 { 33 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; 34 char filename[256]; 35 FILE *f; 36 int i, sock, err, id, key = PARSE_IP; 37 struct bpf_prog_info info = {}; 38 uint32_t info_len = sizeof(info); 39 40 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 41 setrlimit(RLIMIT_MEMLOCK, &r); 42 43 if (load_bpf_file(filename)) { 44 printf("%s", bpf_log_buf); 45 return 1; 46 } 47 48 /* Test fd array lookup which returns the id of the bpf_prog */ 49 err = bpf_obj_get_info_by_fd(PARSE_IP_PROG_FD, &info, &info_len); 50 assert(!err); 51 err = bpf_map_lookup_elem(PROG_ARRAY_FD, &key, &id); 52 assert(!err); 53 assert(id == info.id); 54 55 sock = open_raw_sock("lo"); 56 57 assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd[4], 58 sizeof(__u32)) == 0); 59 60 if (argc > 1) 61 f = popen("ping -c5 localhost", "r"); 62 else 63 f = popen("netperf -l 4 localhost", "r"); 64 (void) f; 65 66 for (i = 0; i < 5; i++) { 67 struct bpf_flow_keys key = {}, next_key; 68 struct pair value; 69 70 sleep(1); 71 printf("IP src.port -> dst.port bytes packets\n"); 72 while (bpf_map_get_next_key(map_fd[2], &key, &next_key) == 0) { 73 bpf_map_lookup_elem(map_fd[2], &next_key, &value); 74 printf("%s.%05d -> %s.%05d %12lld %12lld\n", 75 inet_ntoa((struct in_addr){htonl(next_key.src)}), 76 next_key.port16[0], 77 inet_ntoa((struct in_addr){htonl(next_key.dst)}), 78 next_key.port16[1], 79 value.bytes, value.packets); 80 key = next_key; 81 } 82 } 83 return 0; 84 } 85