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Linux/samples/bpf/sockex2_user.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <stdio.h>
  3 #include <assert.h>
  4 #include <linux/bpf.h>
  5 #include <bpf/bpf.h>
  6 #include "libbpf.h"
  7 #include "sock_example.h"
  8 #include <unistd.h>
  9 #include <arpa/inet.h>
 10 #include <sys/resource.h>
 11 
 12 struct pair {
 13         __u64 packets;
 14         __u64 bytes;
 15 };
 16 
 17 int main(int ac, char **argv)
 18 {
 19         struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
 20         struct bpf_object *obj;
 21         int map_fd, prog_fd;
 22         char filename[256];
 23         int i, sock;
 24         FILE *f;
 25 
 26         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
 27         setrlimit(RLIMIT_MEMLOCK, &r);
 28 
 29         if (bpf_prog_load(filename, BPF_PROG_TYPE_SOCKET_FILTER,
 30                           &obj, &prog_fd))
 31                 return 1;
 32 
 33         map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map");
 34 
 35         sock = open_raw_sock("lo");
 36 
 37         assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd,
 38                           sizeof(prog_fd)) == 0);
 39 
 40         f = popen("ping -4 -c5 localhost", "r");
 41         (void) f;
 42 
 43         for (i = 0; i < 5; i++) {
 44                 int key = 0, next_key;
 45                 struct pair value;
 46 
 47                 while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) {
 48                         bpf_map_lookup_elem(map_fd, &next_key, &value);
 49                         printf("ip %s bytes %lld packets %lld\n",
 50                                inet_ntoa((struct in_addr){htonl(next_key)}),
 51                                value.bytes, value.packets);
 52                         key = next_key;
 53                 }
 54                 sleep(1);
 55         }
 56         return 0;
 57 }
 58 

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