b81584dbe5
Currently, debugging the tethering programs is not easy because in case of any failure they simply return TC_ACT_OK. This CL adds a number of counters that the program can increment in the case of interesting events such as malformed packets. At the moment the counters are stored in a global tethering error map, which is an ARRAY map of 32-bit counters. This should not take up much space because there are only a dozen of these. We might not need all of these counters. In future CLs we can reduce the number of counters, or perhaps move them to a map of maps so as to have separate counters on a per-interface basis. Test: manual Change-Id: I3fcd7eb8d318700092949ff2f39987bf4ba3656c
50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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// Common definitions for BPF code in the tethering mainline module.
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// These definitions are available to:
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// - The BPF programs in Tethering/bpf_progs/
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// - JNI code that depends on the bpf_tethering_headers library.
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#define BPF_TETHER_ERRORS \
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ERR(INVALID_IP_VERSION) \
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ERR(LOW_TTL) \
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ERR(INVALID_TCP_HEADER) \
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ERR(TCP_CONTROL_PACKET) \
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ERR(NON_GLOBAL_SRC) \
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ERR(NON_GLOBAL_DST) \
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ERR(LOCAL_SRC_DST) \
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ERR(NO_STATS_ENTRY) \
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ERR(NO_LIMIT_ENTRY) \
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ERR(BELOW_IPV6_MTU) \
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ERR(LIMIT_REACHED) \
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ERR(CHANGE_HEAD_FAILED) \
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ERR(_MAX)
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#define ERR(x) BPF_TETHER_ERR_ ##x,
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enum {
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BPF_TETHER_ERRORS
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};
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#undef ERR
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#define ERR(x) #x,
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static const char *bpf_tether_errors[] = {
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BPF_TETHER_ERRORS
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};
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#undef ERR
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