78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2021 Google LLC. */
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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__u32 pid = 0;
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char num_out[64] = {};
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long num_ret = 0;
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char ip_out[64] = {};
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long ip_ret = 0;
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char sym_out[64] = {};
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long sym_ret = 0;
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char addr_out[64] = {};
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long addr_ret = 0;
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char str_out[64] = {};
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long str_ret = 0;
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char over_out[6] = {};
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long over_ret = 0;
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char pad_out[10] = {};
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long pad_ret = 0;
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char noarg_out[64] = {};
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long noarg_ret = 0;
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long nobuf_ret = 0;
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extern const void schedule __ksym;
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SEC("raw_tp/sys_enter")
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int handler(const void *ctx)
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{
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/* Convenient values to pretty-print */
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const __u8 ex_ipv4[] = {127, 0, 0, 1};
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const __u8 ex_ipv6[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};
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static const char str1[] = "str1";
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static const char longstr[] = "longstr";
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if ((int)bpf_get_current_pid_tgid() != pid)
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return 0;
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/* Integer types */
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num_ret = BPF_SNPRINTF(num_out, sizeof(num_out),
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"%d %u %x %li %llu %lX",
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-8, 9, 150, -424242, 1337, 0xDABBAD00);
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/* IP addresses */
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ip_ret = BPF_SNPRINTF(ip_out, sizeof(ip_out), "%pi4 %pI6",
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&ex_ipv4, &ex_ipv6);
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/* Symbol lookup formatting */
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sym_ret = BPF_SNPRINTF(sym_out, sizeof(sym_out), "%ps %pS %pB",
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&schedule, &schedule, &schedule);
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/* Kernel pointers */
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addr_ret = BPF_SNPRINTF(addr_out, sizeof(addr_out), "%pK %px %p",
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0, 0xFFFF00000ADD4E55, 0xFFFF00000ADD4E55);
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/* Strings embedding */
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str_ret = BPF_SNPRINTF(str_out, sizeof(str_out), "%s %+05s",
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str1, longstr);
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/* Overflow */
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over_ret = BPF_SNPRINTF(over_out, sizeof(over_out), "%%overflow");
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/* Padding of fixed width numbers */
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pad_ret = BPF_SNPRINTF(pad_out, sizeof(pad_out), "%5d %0900000X", 4, 4);
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/* No args */
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noarg_ret = BPF_SNPRINTF(noarg_out, sizeof(noarg_out), "simple case");
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/* No buffer */
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nobuf_ret = BPF_SNPRINTF(NULL, 0, "only interested in length %d", 60);
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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