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