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Linux/samples/bpf/sockex3_user.c

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

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