| // SPDX-License-Identifier: GPL-2.0 |
| #include <stdio.h> |
| #include <assert.h> |
| #include <bpf/bpf.h> |
| #include <bpf/libbpf.h> |
| #include "sock_example.h" |
| #include <unistd.h> |
| #include <arpa/inet.h> |
| |
| struct flow_key_record { |
| __be32 src; |
| __be32 dst; |
| union { |
| __be32 ports; |
| __be16 port16[2]; |
| }; |
| __u32 ip_proto; |
| }; |
| |
| struct pair { |
| __u64 packets; |
| __u64 bytes; |
| }; |
| |
| int main(int argc, char **argv) |
| { |
| int i, sock, key, fd, main_prog_fd, jmp_table_fd, hash_map_fd; |
| struct bpf_program *prog; |
| struct bpf_object *obj; |
| const char *section; |
| char filename[256]; |
| FILE *f; |
| |
| snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); |
| |
| obj = bpf_object__open_file(filename, NULL); |
| if (libbpf_get_error(obj)) { |
| fprintf(stderr, "ERROR: opening BPF object file failed\n"); |
| return 0; |
| } |
| |
| /* load BPF program */ |
| if (bpf_object__load(obj)) { |
| fprintf(stderr, "ERROR: loading BPF object file failed\n"); |
| goto cleanup; |
| } |
| |
| jmp_table_fd = bpf_object__find_map_fd_by_name(obj, "jmp_table"); |
| hash_map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map"); |
| if (jmp_table_fd < 0 || hash_map_fd < 0) { |
| fprintf(stderr, "ERROR: finding a map in obj file failed\n"); |
| goto cleanup; |
| } |
| |
| bpf_object__for_each_program(prog, obj) { |
| fd = bpf_program__fd(prog); |
| |
| section = bpf_program__section_name(prog); |
| if (sscanf(section, "socket/%d", &key) != 1) { |
| fprintf(stderr, "ERROR: finding prog failed\n"); |
| goto cleanup; |
| } |
| |
| if (key == 0) |
| main_prog_fd = fd; |
| else |
| bpf_map_update_elem(jmp_table_fd, &key, &fd, BPF_ANY); |
| } |
| |
| sock = open_raw_sock("lo"); |
| |
| /* attach BPF program to socket */ |
| assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &main_prog_fd, |
| sizeof(__u32)) == 0); |
| |
| if (argc > 1) |
| f = popen("ping -4 -c5 localhost", "r"); |
| else |
| f = popen("netperf -l 4 localhost", "r"); |
| (void) f; |
| |
| for (i = 0; i < 5; i++) { |
| struct flow_key_record key = {}, next_key; |
| struct pair value; |
| |
| sleep(1); |
| printf("IP src.port -> dst.port bytes packets\n"); |
| while (bpf_map_get_next_key(hash_map_fd, &key, &next_key) == 0) { |
| bpf_map_lookup_elem(hash_map_fd, &next_key, &value); |
| printf("%s.%05d -> %s.%05d %12lld %12lld\n", |
| inet_ntoa((struct in_addr){htonl(next_key.src)}), |
| next_key.port16[0], |
| inet_ntoa((struct in_addr){htonl(next_key.dst)}), |
| next_key.port16[1], |
| value.bytes, value.packets); |
| key = next_key; |
| } |
| } |
| |
| cleanup: |
| bpf_object__close(obj); |
| return 0; |
| } |