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Update buffer allocation strategy and maximum buffer size when using TCP as transport #30404

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Update buffer allocation strategy and maximum buffer size when using TCP as transport #30404

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a419234
Update buffer allocation strategy and maximum buffer size when using …
hnnajh Nov 10, 2023
0bad674
Adding TCP server and client config flag
hnnajh Nov 10, 2023
72421bd
Fix the size limits to be per session instead of one for all sessions
hnnajh Nov 29, 2023
976cb70
remove TCP flags
hnnajh Nov 29, 2023
94d1d8c
address comments
hnnajh Dec 4, 2023
200dea3
Restyled by clang-format
restyled-commits Dec 4, 2023
84adb59
Fix unit tests
hnnajh Dec 5, 2023
15f187a
Restyled by clang-format
restyled-commits Dec 5, 2023
efd7902
fix group messaging
hnnajh Dec 6, 2023
ae12f9a
Merge pull request #181 from project-chip/master
hnnajh Jan 19, 2024
1c2c52c
Restyled by clang-format
restyled-commits Jan 19, 2024
53ec6de
Merge branch 'tcp_heapallocation' of https://github.com/hnnajh/connec…
hnnajh Jan 20, 2024
f0609dc
Merge branch 'master' into tcp_heapallocation
hnnajh Jan 20, 2024
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4 changes: 2 additions & 2 deletions src/transport/SecureMessageCodec.cpp
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Expand Up @@ -37,11 +37,11 @@ using System::PacketBufferHandle;
namespace SecureMessageCodec {

CHIP_ERROR Encrypt(const CryptoContext & context, CryptoContext::ConstNonceView nonce, PayloadHeader & payloadHeader,
PacketHeader & packetHeader, System::PacketBufferHandle & msgBuf)
PacketHeader & packetHeader, System::PacketBufferHandle & msgBuf, size_t inputMaxLength)
{
VerifyOrReturnError(!msgBuf.IsNull(), CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(!msgBuf->HasChainedBuffer(), CHIP_ERROR_INVALID_MESSAGE_LENGTH);
VerifyOrReturnError(msgBuf->TotalLength() <= kMaxAppMessageLen, CHIP_ERROR_MESSAGE_TOO_LONG);
VerifyOrReturnError(msgBuf->TotalLength() <= inputMaxLength, CHIP_ERROR_MESSAGE_TOO_LONG);

static_assert(std::is_same<decltype(msgBuf->TotalLength()), uint16_t>::value,
"Addition to generate payloadLength might overflow");
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3 changes: 2 additions & 1 deletion src/transport/SecureMessageCodec.h
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Expand Up @@ -47,10 +47,11 @@ namespace SecureMessageCodec {
* @param msgBuf The message buffer that contains the unencrypted message. If
* the operation is successful, this buffer will be mutated to contain
* the encrypted message.
* @param inputMaxLength Max size for input
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What is the point of this argument? Why wouldn't callers just pass msgBuf->TotalLength() for it?

Either this argument should not exist, or the documentation needs to do a much better job of explaining what this is for and how it should be used.

My temptation is towards the former: why does the crypto stuff care about this length? It doesn't.

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so this argument is meant to provide the method the maximum length of payload's length
that means we can't just pass msgBuf->TotalLength() because that would bypass the check :) , i think this place is okay since that check is common for all the places that's calling SecureMessageCodec::Encrypt(

* @return A CHIP_ERROR value consistent with the result of the encryption operation
*/
CHIP_ERROR Encrypt(const CryptoContext & context, CryptoContext::ConstNonceView nonce, PayloadHeader & payloadHeader,
PacketHeader & packetHeader, System::PacketBufferHandle & msgBuf);
PacketHeader & packetHeader, System::PacketBufferHandle & msgBuf, size_t inputMaxLength = kMaxAppMessageLen);

/**
* @brief
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13 changes: 12 additions & 1 deletion src/transport/SessionManager.cpp
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Expand Up @@ -201,7 +201,18 @@ CHIP_ERROR SessionManager::PrepareMessage(const SessionHandle & sessionHandle, P
packetHeader.SetSessionId(keyContext->GetKeyHash());
CryptoContext::NonceStorage nonce;
CryptoContext::BuildNonce(nonce, packetHeader.GetSecurityFlags(), packetHeader.GetMessageCounter(), sourceNodeId);
CHIP_ERROR err = SecureMessageCodec::Encrypt(CryptoContext(keyContext), nonce, payloadHeader, packetHeader, message);
CHIP_ERROR err = CHIP_NO_ERROR;
SecureSession * session = sessionHandle->AsSecureSession();
if (session == nullptr)
{
return CHIP_ERROR_NOT_CONNECTED;
}
if (session->GetPeerAddress().GetTransportType() == Transport::Type::kTcp) {
// support large payloads
err = SecureMessageCodec::Encrypt(CryptoContext(keyContext), nonce, payloadHeader, packetHeader, message, kLargePayloadMaxSizeBytes);
} else {
err = SecureMessageCodec::Encrypt(CryptoContext(keyContext), nonce, payloadHeader, packetHeader, message, kMaxAppMessageLen);
}
keyContext->Release();
ReturnErrorOnFailure(err);

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2 changes: 2 additions & 0 deletions src/transport/raw/MessageHeader.h
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Expand Up @@ -71,6 +71,8 @@ static_assert(detail::kMaxApplicationPayloadAndMICSizeBytes > kMaxTagLen, "Need
// tag we will not have source/destination node IDs, but above we are including
// those in the header sizes.
static constexpr size_t kMaxAppMessageLen = detail::kMaxApplicationPayloadAndMICSizeBytes - kMaxTagLen;
// large payload limit
static constexpr size_t kLargePayloadMaxSizeBytes = 128000;

static constexpr uint16_t kMsgUnicastSessionIdUnsecured = 0x0000;

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