// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2021 Google LLC. */ #include <linux/bpf.h> #include <bpf/bpf_helpers.h> __u32 pid = 0; char num_out[64] = {}; long num_ret = 0; char ip_out[64] = {}; long ip_ret = 0; char sym_out[64] = {}; long sym_ret = 0; char addr_out[64] = {}; long addr_ret = 0; char str_out[64] = {}; long str_ret = 0; char over_out[6] = {}; long over_ret = 0; char pad_out[10] = {}; long pad_ret = 0; char noarg_out[64] = {}; long noarg_ret = 0; long nobuf_ret = 0; extern const void schedule __ksym; SEC("raw_tp/sys_enter") int handler(const void *ctx) { /* Convenient values to pretty-print */ const __u8 ex_ipv4[] = {127, 0, 0, 1}; const __u8 ex_ipv6[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}; static const char str1[] = "str1"; static const char longstr[] = "longstr"; if ((int)bpf_get_current_pid_tgid() != pid) return 0; /* Integer types */ num_ret = BPF_SNPRINTF(num_out, sizeof(num_out), "%d %u %x %li %llu %lX", -8, 9, 150, -424242, 1337, 0xDABBAD00); /* IP addresses */ ip_ret = BPF_SNPRINTF(ip_out, sizeof(ip_out), "%pi4 %pI6", &ex_ipv4, &ex_ipv6); /* Symbol lookup formatting */ sym_ret = BPF_SNPRINTF(sym_out, sizeof(sym_out), "%ps %pS %pB", &schedule, &schedule, &schedule); /* Kernel pointers */ addr_ret = BPF_SNPRINTF(addr_out, sizeof(addr_out), "%pK %px %p", 0, 0xFFFF00000ADD4E55, 0xFFFF00000ADD4E55); /* Strings and single-byte character embedding */ str_ret = BPF_SNPRINTF(str_out, sizeof(str_out), "%s % 9c %+2c %-3c %04c %0c %+05s", str1, 'a', 'b', 'c', 'd', 'e', longstr); /* Overflow */ over_ret = BPF_SNPRINTF(over_out, sizeof(over_out), "%%overflow"); /* Padding of fixed width numbers */ pad_ret = BPF_SNPRINTF(pad_out, sizeof(pad_out), "%5d %0900000X", 4, 4); /* No args */ noarg_ret = BPF_SNPRINTF(noarg_out, sizeof(noarg_out), "simple case"); /* No buffer */ nobuf_ret = BPF_SNPRINTF(NULL, 0, "only interested in length %d", 60); return 0; } char _license[] SEC("license") = "GPL";