LXR linux/tools/testing/selftests/bpf/progs/test

   1// SPDX-License-Identifier: GPL-2.0
   2/* Copyright (c) 2021 Google LLC. */
   3
   4#include <linux/bpf.h>
   5#include <bpf/bpf_helpers.h>
   6
   7__u32 pid = 0;
   8
   9char num_out[64] = {};
  10long num_ret = 0;
  11
  12char ip_out[64] = {};
  13long ip_ret = 0;
  14
  15char sym_out[64] = {};
  16long sym_ret = 0;
  17
  18char addr_out[64] = {};
  19long addr_ret = 0;
  20
  21char str_out[64] = {};
  22long str_ret = 0;
  23
  24char over_out[6] = {};
  25long over_ret = 0;
  26
  27char pad_out[10] = {};
  28long pad_ret = 0;
  29
  30char noarg_out[64] = {};
  31long noarg_ret = 0;
  32
  33long nobuf_ret = 0;
  34
  35extern const void schedule __ksym;
  36
  37SEC("raw_tp/sys_enter")
  38int handler(const void *ctx)
  39{
  40        /* Convenient values to pretty-print */
  41        const __u8 ex_ipv4[] = {127, 0, 0, 1};
  42        const __u8 ex_ipv6[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};
  43        static const char str1[] = "str1";
  44        static const char longstr[] = "longstr";
  45
  46        if ((int)bpf_get_current_pid_tgid() != pid)
  47                return 0;
  48
  49        /* Integer types */
  50        num_ret  = BPF_SNPRINTF(num_out, sizeof(num_out),
  51                                "%d %u %x %li %llu %lX",
  52                                -8, 9, 150, -424242, 1337, 0xDABBAD00);
  53        /* IP addresses */
  54        ip_ret   = BPF_SNPRINTF(ip_out, sizeof(ip_out), "%pi4 %pI6",
  55                                &ex_ipv4, &ex_ipv6);
  56        /* Symbol lookup formatting */
  57        sym_ret  = BPF_SNPRINTF(sym_out,  sizeof(sym_out), "%ps %pS %pB",
  58                                &schedule, &schedule, &schedule);
  59        /* Kernel pointers */
  60        addr_ret = BPF_SNPRINTF(addr_out, sizeof(addr_out), "%pK %px %p",
  61                                0, 0xFFFF00000ADD4E55, 0xFFFF00000ADD4E55);
  62        /* Strings and single-byte character embedding */
  63        str_ret  = BPF_SNPRINTF(str_out, sizeof(str_out), "%s % 9c %+2c %-3c %04c %0c %+05s",
  64                                str1, 'a', 'b', 'c', 'd', 'e', longstr);
  65        /* Overflow */
  66        over_ret = BPF_SNPRINTF(over_out, sizeof(over_out), "%%overflow");
  67        /* Padding of fixed width numbers */
  68        pad_ret = BPF_SNPRINTF(pad_out, sizeof(pad_out), "%5d %0900000X", 4, 4);
  69        /* No args */
  70        noarg_ret = BPF_SNPRINTF(noarg_out, sizeof(noarg_out), "simple case");
  71        /* No buffer */
  72        nobuf_ret = BPF_SNPRINTF(NULL, 0, "only interested in length %d", 60);
  73
  74        return 0;
  75}
  76
  77char _license[] SEC("license") = "GPL";
  78