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linux-rockchip
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samples
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bpf
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sock_flags_kern.c

sock_flags_kern.c 986 B
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  1. #include <uapi/linux/bpf.h>
    2. 

  2. #include <linux/socket.h>
    3. 

  3. #include <linux/net.h>
    4. 

  4. #include <uapi/linux/in.h>
    5. 

  5. #include <uapi/linux/in6.h>
    6. 

  6. #include "bpf_helpers.h"
    7. 

  7. 

  8. SEC("cgroup/sock1")
    9. 

  9. int bpf_prog1(struct bpf_sock *sk)
    10. 

  10. {
    11. 

  11. 	char fmt[] = "socket: family %d type %d protocol %d\n";
    12. 

  12. 

  13. 	bpf_trace_printk(fmt, sizeof(fmt), sk->family, sk->type, sk->protocol);
    14. 

  14. 

  15. 	/* block PF_INET6, SOCK_RAW, IPPROTO_ICMPV6 sockets
    16. 

  16. 	 * ie., make ping6 fail
    17. 

  17. 	 */
    18. 

  18. 	if (sk->family == PF_INET6 &&
    19. 

  19. 	    sk->type == SOCK_RAW   &&
    20. 

  20. 	    sk->protocol == IPPROTO_ICMPV6)
    21. 

  21. 		return 0;
    22. 

  22. 

  23. 	return 1;
    24. 

  24. }
    25. 

  25. 

  26. SEC("cgroup/sock2")
    27. 

  27. int bpf_prog2(struct bpf_sock *sk)
    28. 

  28. {
    29. 

  29. 	char fmt[] = "socket: family %d type %d protocol %d\n";
    30. 

  30. 

  31. 	bpf_trace_printk(fmt, sizeof(fmt), sk->family, sk->type, sk->protocol);
    32. 

  32. 

  33. 	/* block PF_INET, SOCK_RAW, IPPROTO_ICMP sockets
    34. 

  34. 	 * ie., make ping fail
    35. 

  35. 	 */
    36. 

  36. 	if (sk->family == PF_INET &&
    37. 

  37. 	    sk->type == SOCK_RAW  &&
    38. 

  38. 	    sk->protocol == IPPROTO_ICMP)
    39. 

  39. 		return 0;
    40. 

  40. 

  41. 	return 1;
    42. 

  42. }
    43. 

  43. 

  44. char _license[] SEC("license") = "GPL";
    45. 

  45.