Eric Lee / smarc-fsl-linux-kernel

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samples/bpf/test_map_in_map_kern.c 3.93 KB
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  /*
   * Copyright (c) 2017 Facebook
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of version 2 of the GNU General Public
   * License as published by the Free Software Foundation.
   */
  #define KBUILD_MODNAME "foo"
  #include <linux/ptrace.h>
  #include <linux/version.h>
  #include <uapi/linux/bpf.h>
  #include <uapi/linux/in6.h>
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  #include <bpf/bpf_helpers.h>
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  #include <bpf/bpf_tracing.h>
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  #include <bpf/bpf_core_read.h>
  #include "trace_common.h"
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  #define MAX_NR_PORTS 65536
  
  /* map #0 */
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  struct inner_a {
  	__uint(type, BPF_MAP_TYPE_ARRAY);
  	__type(key, u32);
  	__type(value, int);
  	__uint(max_entries, MAX_NR_PORTS);
  } port_a SEC(".maps");
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  /* map #1 */
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  struct inner_h {
  	__uint(type, BPF_MAP_TYPE_HASH);
  	__type(key, u32);
  	__type(value, int);
  	__uint(max_entries, 1);
  } port_h SEC(".maps");
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  /* map #2 */
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  struct {
  	__uint(type, BPF_MAP_TYPE_HASH);
  	__type(key, u32);
  	__type(value, int);
  	__uint(max_entries, 1);
  } reg_result_h SEC(".maps");
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  /* map #3 */
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  struct {
  	__uint(type, BPF_MAP_TYPE_HASH);
  	__type(key, u32);
  	__type(value, int);
  	__uint(max_entries, 1);
  } inline_result_h SEC(".maps");
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  /* map #4 */ /* Test case #0 */
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  struct {
  	__uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
  	__uint(max_entries, MAX_NR_PORTS);
  	__uint(key_size, sizeof(u32));
  	__array(values, struct inner_a); /* use inner_a as inner map */
  } a_of_port_a SEC(".maps");
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  /* map #5 */ /* Test case #1 */
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  struct {
  	__uint(type, BPF_MAP_TYPE_HASH_OF_MAPS);
  	__uint(max_entries, 1);
  	__uint(key_size, sizeof(u32));
  	__array(values, struct inner_a); /* use inner_a as inner map */
  } h_of_port_a SEC(".maps");
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  /* map #6 */ /* Test case #2 */
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  struct {
  	__uint(type, BPF_MAP_TYPE_HASH_OF_MAPS);
  	__uint(max_entries, 1);
  	__uint(key_size, sizeof(u32));
  	__array(values, struct inner_h); /* use inner_h as inner map */
  } h_of_port_h SEC(".maps");
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  static __always_inline int do_reg_lookup(void *inner_map, u32 port)
  {
  	int *result;
  
  	result = bpf_map_lookup_elem(inner_map, &port);
  	return result ? *result : -ENOENT;
  }
  
  static __always_inline int do_inline_array_lookup(void *inner_map, u32 port)
  {
  	int *result;
  
  	if (inner_map != &port_a)
  		return -EINVAL;
  
  	result = bpf_map_lookup_elem(&port_a, &port);
  	return result ? *result : -ENOENT;
  }
  
  static __always_inline int do_inline_hash_lookup(void *inner_map, u32 port)
  {
  	int *result;
  
  	if (inner_map != &port_h)
  		return -EINVAL;
  
  	result = bpf_map_lookup_elem(&port_h, &port);
  	return result ? *result : -ENOENT;
  }
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  SEC("kprobe/__sys_connect")
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  int trace_sys_connect(struct pt_regs *ctx)
  {
  	struct sockaddr_in6 *in6;
  	u16 test_case, port, dst6[8];
  	int addrlen, ret, inline_ret, ret_key = 0;
  	u32 port_key;
  	void *outer_map, *inner_map;
  	bool inline_hash = false;
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  	in6 = (struct sockaddr_in6 *)PT_REGS_PARM2_CORE(ctx);
  	addrlen = (int)PT_REGS_PARM3_CORE(ctx);
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  	if (addrlen != sizeof(*in6))
  		return 0;
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  	ret = bpf_probe_read_user(dst6, sizeof(dst6), &in6->sin6_addr);
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  	if (ret) {
  		inline_ret = ret;
  		goto done;
  	}
  
  	if (dst6[0] != 0xdead || dst6[1] != 0xbeef)
  		return 0;
  
  	test_case = dst6[7];
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  	ret = bpf_probe_read_user(&port, sizeof(port), &in6->sin6_port);
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  	if (ret) {
  		inline_ret = ret;
  		goto done;
  	}
  
  	port_key = port;
  
  	ret = -ENOENT;
  	if (test_case == 0) {
  		outer_map = &a_of_port_a;
  	} else if (test_case == 1) {
  		outer_map = &h_of_port_a;
  	} else if (test_case == 2) {
  		outer_map = &h_of_port_h;
  	} else {
  		ret = __LINE__;
  		inline_ret = ret;
  		goto done;
  	}
  
  	inner_map = bpf_map_lookup_elem(outer_map, &port_key);
  	if (!inner_map) {
  		ret = __LINE__;
  		inline_ret = ret;
  		goto done;
  	}
  
  	ret = do_reg_lookup(inner_map, port_key);
  
  	if (test_case == 0 || test_case == 1)
  		inline_ret = do_inline_array_lookup(inner_map, port_key);
  	else
  		inline_ret = do_inline_hash_lookup(inner_map, port_key);
  
  done:
  	bpf_map_update_elem(&reg_result_h, &ret_key, &ret, BPF_ANY);
  	bpf_map_update_elem(&inline_result_h, &ret_key, &inline_ret, BPF_ANY);
  
  	return 0;
  }
  
  char _license[] SEC("license") = "GPL";
  u32 _version SEC("version") = LINUX_VERSION_CODE;