85 строки
1.9 KiB
C
85 строки
1.9 KiB
C
// 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 <linux/bpf.h>
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#include <bpf/bpf.h>
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#include "bpf_load.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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#define PARSE_IP 3
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#define PARSE_IP_PROG_FD (prog_fd[0])
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#define PROG_ARRAY_FD (map_fd[0])
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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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struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
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char filename[256];
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FILE *f;
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int i, sock, err, id, key = PARSE_IP;
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struct bpf_prog_info info = {};
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uint32_t info_len = sizeof(info);
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snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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setrlimit(RLIMIT_MEMLOCK, &r);
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if (load_bpf_file(filename)) {
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printf("%s", bpf_log_buf);
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return 1;
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}
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/* Test fd array lookup which returns the id of the bpf_prog */
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err = bpf_obj_get_info_by_fd(PARSE_IP_PROG_FD, &info, &info_len);
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assert(!err);
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err = bpf_map_lookup_elem(PROG_ARRAY_FD, &key, &id);
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assert(!err);
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assert(id == info.id);
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sock = open_raw_sock("lo");
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assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd[4],
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sizeof(__u32)) == 0);
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if (argc > 1)
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f = popen("ping -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(map_fd[2], &key, &next_key) == 0) {
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bpf_map_lookup_elem(map_fd[2], &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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return 0;
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}
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