sockex3_user.c 2.5 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. #include <stdio.h>
  3. #include <assert.h>
  4. #include <bpf/bpf.h>
  5. #include <bpf/libbpf.h>
  6. #include "sock_example.h"
  7. #include <unistd.h>
  8. #include <arpa/inet.h>
  9. #include <sys/resource.h>
  10. struct flow_key_record {
  11. __be32 src;
  12. __be32 dst;
  13. union {
  14. __be32 ports;
  15. __be16 port16[2];
  16. };
  17. __u32 ip_proto;
  18. };
  19. struct pair {
  20. __u64 packets;
  21. __u64 bytes;
  22. };
  23. int main(int argc, char **argv)
  24. {
  25. int i, sock, key, fd, main_prog_fd, jmp_table_fd, hash_map_fd;
  26. struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
  27. struct bpf_program *prog;
  28. struct bpf_object *obj;
  29. const char *section;
  30. char filename[256];
  31. FILE *f;
  32. snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  33. setrlimit(RLIMIT_MEMLOCK, &r);
  34. obj = bpf_object__open_file(filename, NULL);
  35. if (libbpf_get_error(obj)) {
  36. fprintf(stderr, "ERROR: opening BPF object file failed\n");
  37. return 0;
  38. }
  39. /* load BPF program */
  40. if (bpf_object__load(obj)) {
  41. fprintf(stderr, "ERROR: loading BPF object file failed\n");
  42. goto cleanup;
  43. }
  44. jmp_table_fd = bpf_object__find_map_fd_by_name(obj, "jmp_table");
  45. hash_map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map");
  46. if (jmp_table_fd < 0 || hash_map_fd < 0) {
  47. fprintf(stderr, "ERROR: finding a map in obj file failed\n");
  48. goto cleanup;
  49. }
  50. bpf_object__for_each_program(prog, obj) {
  51. fd = bpf_program__fd(prog);
  52. section = bpf_program__section_name(prog);
  53. if (sscanf(section, "socket/%d", &key) != 1) {
  54. fprintf(stderr, "ERROR: finding prog failed\n");
  55. goto cleanup;
  56. }
  57. if (key == 0)
  58. main_prog_fd = fd;
  59. else
  60. bpf_map_update_elem(jmp_table_fd, &key, &fd, BPF_ANY);
  61. }
  62. sock = open_raw_sock("lo");
  63. /* attach BPF program to socket */
  64. assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &main_prog_fd,
  65. sizeof(__u32)) == 0);
  66. if (argc > 1)
  67. f = popen("ping -4 -c5 localhost", "r");
  68. else
  69. f = popen("netperf -l 4 localhost", "r");
  70. (void) f;
  71. for (i = 0; i < 5; i++) {
  72. struct flow_key_record key = {}, next_key;
  73. struct pair value;
  74. sleep(1);
  75. printf("IP src.port -> dst.port bytes packets\n");
  76. while (bpf_map_get_next_key(hash_map_fd, &key, &next_key) == 0) {
  77. bpf_map_lookup_elem(hash_map_fd, &next_key, &value);
  78. printf("%s.%05d -> %s.%05d %12lld %12lld\n",
  79. inet_ntoa((struct in_addr){htonl(next_key.src)}),
  80. next_key.port16[0],
  81. inet_ntoa((struct in_addr){htonl(next_key.dst)}),
  82. next_key.port16[1],
  83. value.bytes, value.packets);
  84. key = next_key;
  85. }
  86. }
  87. cleanup:
  88. bpf_object__close(obj);
  89. return 0;
  90. }