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#include <stdio.h>
#include <assert.h>
#include <linux/bpf.h>
#include "libbpf.h"
#include "bpf_load.h"
#include "sock_example.h"
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/resource.h>
#define PARSE_IP 3
#define PARSE_IP_PROG_FD (prog_fd[0])
#define PROG_ARRAY_FD (map_fd[0])
struct bpf_flow_keys {
__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)
{
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
char filename[256];
FILE *f;
int i, sock, err, id, key = PARSE_IP;
struct bpf_prog_info info = {};
uint32_t info_len = sizeof(info);
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
setrlimit(RLIMIT_MEMLOCK, &r);
if (load_bpf_file(filename)) {
printf("%s", bpf_log_buf);
return 1;
}
/* Test fd array lookup which returns the id of the bpf_prog */
err = bpf_obj_get_info_by_fd(PARSE_IP_PROG_FD, &info, &info_len);
assert(!err);
err = bpf_map_lookup_elem(PROG_ARRAY_FD, &key, &id);
assert(!err);
assert(id == info.id);
sock = open_raw_sock("lo");
assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd[4],
sizeof(__u32)) == 0);
if (argc > 1)
f = popen("ping -c5 localhost", "r");
else
f = popen("netperf -l 4 localhost", "r");
(void) f;
for (i = 0; i < 5; i++) {
struct bpf_flow_keys key = {}, next_key;
struct pair value;
sleep(1);
printf("IP src.port -> dst.port bytes packets\n");
while (bpf_map_get_next_key(map_fd[2], &key, &next_key) == 0) {
bpf_map_lookup_elem(map_fd[2], &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;
}
}
return 0;
}
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