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Add wraparound logic to handle ACK sequence wraparound.

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This commit is contained in:
Herbert Wolverson 2024-02-29 11:35:25 -06:00
parent 370b65fa67
commit 2be8ce4aa9
1 changed files with 8 additions and 1 deletions
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9
src/rust/lqos_sys/src/bpf/common/flows.h
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@ -245,7 +245,14 @@ static __always_inline void process_tcp(
// Sequence and Acknowledgement numbers
__u32 sequence = bpf_ntohl(dissector->sequence);
__u32 ack_seq = bpf_ntohl(dissector->ack_seq);
if (data->last_sequence[rate_index] != 0 && sequence < data->last_sequence[rate_index]) {
if (
data->last_sequence[rate_index] != 0 && // We have a previous sequence number
sequence < data->last_sequence[rate_index] && // This is a retransmission
(
data->last_sequence[rate_index] > 0x10000 && // Wrap around possible
sequence > data->last_sequence[rate_index] - 0x10000 // Wrap around didn't occur
)
) {
// This is a retransmission
data->retries[rate_index]++;
}