Revert "tcp: rfc 2018: implemented SACK option"
This reverts commit 5c31f5a67a
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This commit is contained in:
parent
2f29f5a241
commit
d815bbcbcc
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@ -436,41 +436,6 @@ BufferQueue::SetPushPointer()
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fPushPointer = fList.Tail()->sequence + fList.Tail()->size;
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}
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int
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BufferQueue::PopulateSackInfo(tcp_sequence sequence, int maxSackCount, tcp_sack* sacks)
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{
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SegmentList::ReverseIterator iterator = fList.GetReverseIterator();
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net_buffer* buffer = iterator.Next();
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int sackCount = 0;
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while (buffer != NULL && buffer->sequence > sequence) {
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if (buffer->sequence + buffer->size < sacks[sackCount].left_edge) {
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if (sackCount + 1 == maxSackCount)
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break;
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++sackCount;
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sacks[sackCount].left_edge = buffer->sequence;
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sacks[sackCount].right_edge = buffer->sequence + buffer->size;
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} else {
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sacks[sackCount].left_edge = buffer->sequence;
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if (sacks[sackCount].right_edge == 0)
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sacks[sackCount].right_edge = buffer->sequence + buffer->size;
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}
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buffer = iterator.Next();
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}
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if (sacks[0].left_edge != 0) {
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for (int i = 0; i <= sackCount; ++i) {
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sacks[i].left_edge = htonl(sacks[i].left_edge);
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sacks[i].right_edge = htonl(sacks[i].right_edge);
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}
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++sackCount;
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}
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return sackCount;
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}
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#if DEBUG_BUFFER_QUEUE
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/*! Perform a sanity check of the whole queue.
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@ -42,7 +42,6 @@ public:
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inline size_t PushedData() const;
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void SetPushPointer();
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int PopulateSackInfo(tcp_sequence sequence, int maxSackCount, tcp_sack* sacks);
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size_t Used() const { return fNumBytes; }
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inline size_t Free() const;
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@ -318,8 +318,7 @@ enum {
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FLAG_CLOSED = 0x08,
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FLAG_DELETE_ON_CLOSE = 0x10,
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FLAG_LOCAL = 0x20,
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FLAG_RECOVERY = 0x40,
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FLAG_OPTION_SACK_PERMITTED = 0x80,
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FLAG_RECOVERY = 0x40
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};
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@ -449,7 +448,7 @@ TCPEndpoint::TCPEndpoint(net_socket* socket)
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fCongestionWindow(0),
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fSlowStartThreshold(0),
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fState(CLOSED),
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fFlags(FLAG_OPTION_WINDOW_SCALE | FLAG_OPTION_TIMESTAMP | FLAG_OPTION_SACK_PERMITTED)
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fFlags(FLAG_OPTION_WINDOW_SCALE | FLAG_OPTION_TIMESTAMP)
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{
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// TODO: to be replaced with a real read/write locking strategy!
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mutex_init(&fLock, "tcp lock");
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@ -1425,9 +1424,6 @@ TCPEndpoint::_PrepareReceivePath(tcp_segment_header& segment)
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fReceivedTimestamp = segment.timestamp_value;
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} else
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fFlags &= ~FLAG_OPTION_TIMESTAMP;
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if ((segment.options & TCP_SACK_PERMITTED) == 0)
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fFlags &= ~FLAG_OPTION_SACK_PERMITTED;
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}
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fCongestionWindow = 2 * fSendMaxSegmentSize;
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@ -2019,18 +2015,6 @@ TCPEndpoint::_SendQueued(bool force, uint32 sendWindow)
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segment.timestamp_value = tcp_now();
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}
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// SACK information is embedded with duplicate acknowledgements
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if (!fReceiveQueue.IsContiguous() && fLastAcknowledgeSent == fReceiveNext
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&& (fFlags & FLAG_OPTION_SACK_PERMITTED) != 0) {
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segment.options |= TCP_HAS_SACK;
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int maxSackCount = 4 - ((fFlags & FLAG_OPTION_TIMESTAMP) != 0);
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segment.sacks = (tcp_sack*)calloc(maxSackCount, sizeof(tcp_sack));
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if (segment.sacks != NULL)
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segment.sackCount = fReceiveQueue.PopulateSackInfo(fReceiveNext, maxSackCount, segment.sacks);
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else
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segment.sackCount = 0;
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}
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if ((segment.flags & TCP_FLAG_SYNCHRONIZE) != 0
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&& fSendNext == fInitialSendSequence) {
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// add connection establishment options
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@ -2039,8 +2023,6 @@ TCPEndpoint::_SendQueued(bool force, uint32 sendWindow)
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segment.options |= TCP_HAS_WINDOW_SCALE;
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segment.window_shift = fReceiveWindowShift;
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}
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if ((fFlags & FLAG_OPTION_SACK_PERMITTED) != 0)
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segment.options |= TCP_SACK_PERMITTED;
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}
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}
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@ -140,10 +140,10 @@ add_options(tcp_segment_header &segment, uint8 *buffer, size_t bufferSize)
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bump_option(option, length);
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}
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if (segment.sackCount > 0) {
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if (segment.sack_count > 0) {
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int sackCount = ((int)(bufferSize - length) - 4) / sizeof(tcp_sack);
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if (sackCount > segment.sackCount)
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sackCount = segment.sackCount;
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if (sackCount > segment.sack_count)
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sackCount = segment.sack_count;
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if (sackCount > 0) {
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option->kind = TCP_OPTION_NOP;
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@ -154,7 +154,6 @@ add_options(tcp_segment_header &segment, uint8 *buffer, size_t bufferSize)
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option->length = 2 + sackCount * sizeof(tcp_sack);
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memcpy(option->sack, segment.sacks, sackCount * sizeof(tcp_sack));
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bump_option(option, length);
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free(segment.sacks);
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}
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}
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@ -219,18 +218,6 @@ process_options(tcp_segment_header &segment, net_buffer *buffer, size_t size)
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if (option->length == 2 && size >= 2)
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segment.options |= TCP_SACK_PERMITTED;
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break;
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case TCP_OPTION_SACK:
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if (size >= option->length) {
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segment.options |= TCP_HAS_SACK;
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segment.sackCount = (option->length - 2) / sizeof(tcp_sack);
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segment.sacks = option->sack;
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for (int i = 0; i < segment.sackCount; ++i) {
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segment.sacks[i].left_edge = ntohl(segment.sacks[i].left_edge);
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segment.sacks[i].right_edge = ntohl(segment.sacks[i].right_edge);
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}
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}
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break;
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}
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if (length < 0) {
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@ -445,9 +432,9 @@ tcp_options_length(tcp_segment_header& segment)
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if (segment.options & TCP_SACK_PERMITTED)
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length += 2;
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if (segment.sackCount > 0) {
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if (segment.sack_count > 0) {
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int sackCount = min_c((int)((kMaxOptionSize - length - 4)
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/ sizeof(tcp_sack)), segment.sackCount);
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/ sizeof(tcp_sack)), segment.sack_count);
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if (sackCount > 0)
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length += 4 + sackCount * sizeof(tcp_sack);
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}
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@ -229,7 +229,6 @@ enum {
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TCP_HAS_WINDOW_SCALE = 1 << 0,
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TCP_HAS_TIMESTAMPS = 1 << 1,
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TCP_SACK_PERMITTED = 1 << 2,
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TCP_HAS_SACK = 1 << 3,
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};
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struct tcp_segment_header {
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@ -238,7 +237,7 @@ struct tcp_segment_header {
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flags(_flags),
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window_shift(0),
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max_segment_size(0),
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sackCount(0),
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sack_count(0),
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options(0)
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{}
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@ -254,7 +253,7 @@ struct tcp_segment_header {
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uint32 timestamp_reply;
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tcp_sack *sacks;
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int sackCount;
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int sack_count;
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uint32 options;
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