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![Ilya Leoshkevich](/assets/img/avatar_default.png)
s390 uses socketcall multiplexer instead of individual socket syscalls. Therefore, "kprobe/" SYSCALL(sys_connect) does not trigger and test_map_in_map fails. Fix by using "kprobe/__sys_connect" instead. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20200915115519.3769807-1-iii@linux.ibm.com
176 lines
3.9 KiB
C
176 lines
3.9 KiB
C
/*
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* Copyright (c) 2017 Facebook
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#define KBUILD_MODNAME "foo"
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#include <linux/ptrace.h>
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#include <linux/version.h>
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#include <uapi/linux/bpf.h>
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#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>
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#include "trace_common.h"
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#define MAX_NR_PORTS 65536
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/* map #0 */
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struct inner_a {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__type(key, u32);
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__type(value, int);
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__uint(max_entries, MAX_NR_PORTS);
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} port_a SEC(".maps");
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/* map #1 */
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struct inner_h {
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__uint(type, BPF_MAP_TYPE_HASH);
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__type(key, u32);
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__type(value, int);
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__uint(max_entries, 1);
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} port_h SEC(".maps");
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/* map #2 */
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__type(key, u32);
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__type(value, int);
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__uint(max_entries, 1);
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} reg_result_h SEC(".maps");
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/* map #3 */
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__type(key, u32);
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__type(value, int);
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__uint(max_entries, 1);
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} inline_result_h SEC(".maps");
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/* map #4 */ /* Test case #0 */
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
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__uint(max_entries, MAX_NR_PORTS);
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__uint(key_size, sizeof(u32));
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__array(values, struct inner_a); /* use inner_a as inner map */
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} a_of_port_a SEC(".maps");
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/* map #5 */ /* Test case #1 */
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struct {
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__uint(type, BPF_MAP_TYPE_HASH_OF_MAPS);
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__uint(max_entries, 1);
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__uint(key_size, sizeof(u32));
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__array(values, struct inner_a); /* use inner_a as inner map */
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} h_of_port_a SEC(".maps");
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/* map #6 */ /* Test case #2 */
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struct {
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__uint(type, BPF_MAP_TYPE_HASH_OF_MAPS);
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__uint(max_entries, 1);
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__uint(key_size, sizeof(u32));
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__array(values, struct inner_h); /* use inner_h as inner map */
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} h_of_port_h SEC(".maps");
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static __always_inline int do_reg_lookup(void *inner_map, u32 port)
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{
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int *result;
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result = bpf_map_lookup_elem(inner_map, &port);
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return result ? *result : -ENOENT;
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}
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static __always_inline int do_inline_array_lookup(void *inner_map, u32 port)
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{
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int *result;
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if (inner_map != &port_a)
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return -EINVAL;
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result = bpf_map_lookup_elem(&port_a, &port);
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return result ? *result : -ENOENT;
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}
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static __always_inline int do_inline_hash_lookup(void *inner_map, u32 port)
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{
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int *result;
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if (inner_map != &port_h)
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return -EINVAL;
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result = bpf_map_lookup_elem(&port_h, &port);
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return result ? *result : -ENOENT;
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}
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SEC("kprobe/__sys_connect")
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int trace_sys_connect(struct pt_regs *ctx)
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{
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struct sockaddr_in6 *in6;
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u16 test_case, port, dst6[8];
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int addrlen, ret, inline_ret, ret_key = 0;
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u32 port_key;
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void *outer_map, *inner_map;
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bool inline_hash = false;
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in6 = (struct sockaddr_in6 *)PT_REGS_PARM2_CORE(ctx);
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addrlen = (int)PT_REGS_PARM3_CORE(ctx);
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if (addrlen != sizeof(*in6))
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return 0;
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ret = bpf_probe_read_user(dst6, sizeof(dst6), &in6->sin6_addr);
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if (ret) {
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inline_ret = ret;
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goto done;
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}
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if (dst6[0] != 0xdead || dst6[1] != 0xbeef)
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return 0;
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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) {
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inline_ret = ret;
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goto done;
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}
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port_key = port;
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ret = -ENOENT;
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if (test_case == 0) {
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outer_map = &a_of_port_a;
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} else if (test_case == 1) {
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outer_map = &h_of_port_a;
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} else if (test_case == 2) {
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outer_map = &h_of_port_h;
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} else {
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ret = __LINE__;
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inline_ret = ret;
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goto done;
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}
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inner_map = bpf_map_lookup_elem(outer_map, &port_key);
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if (!inner_map) {
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ret = __LINE__;
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inline_ret = ret;
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goto done;
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}
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ret = do_reg_lookup(inner_map, port_key);
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if (test_case == 0 || test_case == 1)
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inline_ret = do_inline_array_lookup(inner_map, port_key);
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else
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inline_ret = do_inline_hash_lookup(inner_map, port_key);
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done:
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bpf_map_update_elem(®_result_h, &ret_key, &ret, BPF_ANY);
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bpf_map_update_elem(&inline_result_h, &ret_key, &inline_ret, BPF_ANY);
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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u32 _version SEC("version") = LINUX_VERSION_CODE;
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