1c2e39c6bSFlorent Revest // SPDX-License-Identifier: GPL-2.0
2c2e39c6bSFlorent Revest /* Copyright (c) 2021 Google LLC. */
3c2e39c6bSFlorent Revest
4c2e39c6bSFlorent Revest #include <linux/bpf.h>
5c2e39c6bSFlorent Revest #include <bpf/bpf_helpers.h>
6c2e39c6bSFlorent Revest
7f80f88f0SFlorent Revest __u32 pid = 0;
8f80f88f0SFlorent Revest
9c2e39c6bSFlorent Revest char num_out[64] = {};
10c2e39c6bSFlorent Revest long num_ret = 0;
11c2e39c6bSFlorent Revest
12c2e39c6bSFlorent Revest char ip_out[64] = {};
13c2e39c6bSFlorent Revest long ip_ret = 0;
14c2e39c6bSFlorent Revest
15c2e39c6bSFlorent Revest char sym_out[64] = {};
16c2e39c6bSFlorent Revest long sym_ret = 0;
17c2e39c6bSFlorent Revest
18c2e39c6bSFlorent Revest char addr_out[64] = {};
19c2e39c6bSFlorent Revest long addr_ret = 0;
20c2e39c6bSFlorent Revest
21c2e39c6bSFlorent Revest char str_out[64] = {};
22c2e39c6bSFlorent Revest long str_ret = 0;
23c2e39c6bSFlorent Revest
24c2e39c6bSFlorent Revest char over_out[6] = {};
25c2e39c6bSFlorent Revest long over_ret = 0;
26c2e39c6bSFlorent Revest
27c2e39c6bSFlorent Revest char pad_out[10] = {};
28c2e39c6bSFlorent Revest long pad_ret = 0;
29c2e39c6bSFlorent Revest
30c2e39c6bSFlorent Revest char noarg_out[64] = {};
31c2e39c6bSFlorent Revest long noarg_ret = 0;
32c2e39c6bSFlorent Revest
33c2e39c6bSFlorent Revest long nobuf_ret = 0;
34c2e39c6bSFlorent Revest
35c2e39c6bSFlorent Revest extern const void schedule __ksym;
36c2e39c6bSFlorent Revest
37c2e39c6bSFlorent Revest SEC("raw_tp/sys_enter")
handler(const void * ctx)38c2e39c6bSFlorent Revest int handler(const void *ctx)
39c2e39c6bSFlorent Revest {
40c2e39c6bSFlorent Revest /* Convenient values to pretty-print */
41c2e39c6bSFlorent Revest const __u8 ex_ipv4[] = {127, 0, 0, 1};
42c2e39c6bSFlorent Revest const __u8 ex_ipv6[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};
43c2e39c6bSFlorent Revest static const char str1[] = "str1";
44c2e39c6bSFlorent Revest static const char longstr[] = "longstr";
45c2e39c6bSFlorent Revest
46f80f88f0SFlorent Revest if ((int)bpf_get_current_pid_tgid() != pid)
47f80f88f0SFlorent Revest return 0;
48f80f88f0SFlorent Revest
49c2e39c6bSFlorent Revest /* Integer types */
50c2e39c6bSFlorent Revest num_ret = BPF_SNPRINTF(num_out, sizeof(num_out),
51c2e39c6bSFlorent Revest "%d %u %x %li %llu %lX",
52c2e39c6bSFlorent Revest -8, 9, 150, -424242, 1337, 0xDABBAD00);
53c2e39c6bSFlorent Revest /* IP addresses */
54c2e39c6bSFlorent Revest ip_ret = BPF_SNPRINTF(ip_out, sizeof(ip_out), "%pi4 %pI6",
55c2e39c6bSFlorent Revest &ex_ipv4, &ex_ipv6);
56c2e39c6bSFlorent Revest /* Symbol lookup formatting */
57c2e39c6bSFlorent Revest sym_ret = BPF_SNPRINTF(sym_out, sizeof(sym_out), "%ps %pS %pB",
58c2e39c6bSFlorent Revest &schedule, &schedule, &schedule);
59c2e39c6bSFlorent Revest /* Kernel pointers */
60c2e39c6bSFlorent Revest addr_ret = BPF_SNPRINTF(addr_out, sizeof(addr_out), "%pK %px %p",
61c2e39c6bSFlorent Revest 0, 0xFFFF00000ADD4E55, 0xFFFF00000ADD4E55);
62*ce547335SKuniyuki Iwashima /* Strings and single-byte character embedding */
63*ce547335SKuniyuki Iwashima str_ret = BPF_SNPRINTF(str_out, sizeof(str_out), "%s % 9c %+2c %-3c %04c %0c %+05s",
64*ce547335SKuniyuki Iwashima str1, 'a', 'b', 'c', 'd', 'e', longstr);
65c2e39c6bSFlorent Revest /* Overflow */
66c2e39c6bSFlorent Revest over_ret = BPF_SNPRINTF(over_out, sizeof(over_out), "%%overflow");
67c2e39c6bSFlorent Revest /* Padding of fixed width numbers */
68c2e39c6bSFlorent Revest pad_ret = BPF_SNPRINTF(pad_out, sizeof(pad_out), "%5d %0900000X", 4, 4);
69c2e39c6bSFlorent Revest /* No args */
70c2e39c6bSFlorent Revest noarg_ret = BPF_SNPRINTF(noarg_out, sizeof(noarg_out), "simple case");
71c2e39c6bSFlorent Revest /* No buffer */
72c2e39c6bSFlorent Revest nobuf_ret = BPF_SNPRINTF(NULL, 0, "only interested in length %d", 60);
73c2e39c6bSFlorent Revest
74c2e39c6bSFlorent Revest return 0;
75c2e39c6bSFlorent Revest }
76c2e39c6bSFlorent Revest
77c2e39c6bSFlorent Revest char _license[] SEC("license") = "GPL";
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