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[Dnssd] Sort IPs by scores for commissionable node discovery (#23292)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| /* | ||
| * | ||
| * Copyright (c) 2022 Project CHIP Authors | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
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| #include <lib/dnssd/IPAddressSorter.h> | ||
| #include <lib/support/SortUtils.h> | ||
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| namespace chip { | ||
| namespace Dnssd { | ||
| namespace IPAddressSorter { | ||
|
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| void Sort(Inet::IPAddress * addresses, size_t count, Inet::InterfaceId interfaceId) | ||
| { | ||
| Sorting::BubbleSort(addresses, count, [interfaceId](const Inet::IPAddress & a, const Inet::IPAddress & b) -> bool { | ||
| auto scoreA = to_underlying(ScoreIpAddress(a, interfaceId)); | ||
| auto scoreB = to_underlying(ScoreIpAddress(b, interfaceId)); | ||
| return scoreA > scoreB; | ||
| }); | ||
| } | ||
|
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| void Sort(const Span<Inet::IPAddress> & addresses, Inet::InterfaceId interfaceId) | ||
| { | ||
| Sorting::BubbleSort(addresses.begin(), addresses.size(), | ||
| [interfaceId](const Inet::IPAddress & a, const Inet::IPAddress & b) -> bool { | ||
| auto scoreA = to_underlying(ScoreIpAddress(a, interfaceId)); | ||
| auto scoreB = to_underlying(ScoreIpAddress(b, interfaceId)); | ||
| return scoreA > scoreB; | ||
| }); | ||
| } | ||
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| IpScore ScoreIpAddress(const Inet::IPAddress & ip, Inet::InterfaceId interfaceId) | ||
| { | ||
| if (ip.IsIPv6()) | ||
| { | ||
| #ifdef __APPLE__ | ||
| if (ip.IsIPv6LinkLocal()) | ||
| { | ||
| return IpScore::kLinkLocal; | ||
| } | ||
| #endif // __APPLE__ | ||
|
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| if (interfaceId.MatchLocalIPv6Subnet(ip)) | ||
| { | ||
| if (ip.IsIPv6GlobalUnicast()) | ||
| { | ||
| return IpScore::kGlobalUnicastWithSharedPrefix; | ||
| } | ||
| if (ip.IsIPv6ULA()) | ||
| { | ||
| return IpScore::kUniqueLocalWithSharedPrefix; | ||
| } | ||
| } | ||
| if (ip.IsIPv6GlobalUnicast()) | ||
| { | ||
| return IpScore::kGlobalUnicast; | ||
| } | ||
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| if (ip.IsIPv6ULA()) | ||
| { | ||
| return IpScore::kUniqueLocal; | ||
| } | ||
|
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| #ifndef __APPLE__ | ||
| if (ip.IsIPv6LinkLocal()) | ||
| { | ||
| return IpScore::kLinkLocal; | ||
| } | ||
| #endif // __APPLE__ | ||
|
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| return IpScore::kOtherIpv6; | ||
| } | ||
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| return IpScore::kIpv4; | ||
| } | ||
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| } // namespace IPAddressSorter | ||
| } // namespace Dnssd | ||
| } // namespace chip |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| /* | ||
| * | ||
| * Copyright (c) 2022 Project CHIP Authors | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| #pragma once | ||
|
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| #include <inet/IPAddress.h> | ||
| #include <lib/support/Span.h> | ||
|
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| namespace chip { | ||
| namespace Dnssd { | ||
| namespace IPAddressSorter { | ||
|
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| // IP addess "suitability" | ||
| // - Larger value means "more suitable" | ||
| // - Enum ordered ascending for easier read. Note however that order of | ||
| // checks MUST match in ScoreIpAddress below. | ||
| enum class IpScore : unsigned | ||
| { | ||
| kInvalid = 0, // No address available | ||
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| // "Other" IPv6 include: | ||
| // - invalid addresses (have seen router bugs during interop testing) | ||
| // - embedded IPv4 (::/80) | ||
| kOtherIpv6 = 1, | ||
| kIpv4 = 2, // Not Matter SPEC, so low priority | ||
| #ifdef __APPLE__ | ||
| kUniqueLocal = 3, // ULA. Thread devices use this | ||
| kGlobalUnicast = 4, // Maybe routable, not local subnet | ||
| kUniqueLocalWithSharedPrefix = 5, // Prefix seems to match a local interface | ||
| kGlobalUnicastWithSharedPrefix = 6, // Prefix seems to match a local interface | ||
| kLinkLocal = 7, // Valid only on an interface | ||
| #else | ||
| kLinkLocal = 3, // Valid only on an interface | ||
| kUniqueLocal = 4, // ULA. Thread devices use this | ||
| kGlobalUnicast = 5, // Maybe routable, not local subnet | ||
| kUniqueLocalWithSharedPrefix = 6, // Prefix seems to match a local interface | ||
| kGlobalUnicastWithSharedPrefix = 7, // Prefix seems to match a local interface | ||
| #endif // __APPLE__ | ||
| }; | ||
|
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| void Sort(Inet::IPAddress * addresses, size_t count, Inet::InterfaceId interfaceId); | ||
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| void Sort(const Span<Inet::IPAddress> & addresses, Inet::InterfaceId interfaceId); | ||
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| /** | ||
| * Gives a score for an IP address, generally related to "how good" the address | ||
| * is and how likely it is for it to be reachable. | ||
| */ | ||
| IpScore ScoreIpAddress(const Inet::IPAddress & ip, Inet::InterfaceId interfaceId); | ||
|
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| } // namespace IPAddressSorter | ||
| } // namespace Dnssd | ||
| } // namespace chip |
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