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use chunking #113

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48 changes: 36 additions & 12 deletions ebpf/kernel/module.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -394,19 +394,43 @@ static __inline void process_syscall_data(struct pt_regs* ret, const struct data
bytes_exchanged = bytes_exchanged_minus_1 + 1;

size_t size_to_save = 0;
if (bytes_exchanged_minus_1 < MAX_MSG_SIZE) {
bpf_probe_read(&socket_data_event->msg, bytes_exchanged, args->buf);
size_to_save = bytes_exchanged;
socket_data_event->msg[size_to_save] = '\\0';
} else if (bytes_exchanged_minus_1 < 0x7fffffff) {
bpf_probe_read(&socket_data_event->msg, MAX_MSG_SIZE, args->buf);
size_to_save = MAX_MSG_SIZE;
}

size_t bytes_remaining = bytes_exchanged;
size_t current_offset = 0;

socket_data_event->bytes_sent *= size_to_save;

socket_data_events.perf_submit(ret, socket_data_event, sizeof(struct socket_data_event_t) - MAX_MSG_SIZE + size_to_save);
// Process data in chunks
while (bytes_remaining > 0) {
size_t chunk_size = bytes_remaining < MAX_MSG_SIZE ? bytes_remaining : MAX_MSG_SIZE;

// Read chunk from buffer at current offset
bpf_probe_read(&socket_data_event->msg, chunk_size, args->buf + current_offset);
size_to_save = chunk_size;

// Add null terminator for string processing
if (chunk_size < MAX_MSG_SIZE) {
socket_data_event->msg[size_to_save] = '\\0';
}

// Update event counters for chunk sequencing
if (is_send) {
conn_info->writeEventsCount = (conn_info->writeEventsCount) + 1u;
socket_data_event->writeEventsCount = conn_info->writeEventsCount;
socket_data_event->readEventsCount = conn_info->readEventsCount;
} else {
conn_info->readEventsCount = (conn_info->readEventsCount) + 1u;
socket_data_event->readEventsCount = conn_info->readEventsCount;
socket_data_event->writeEventsCount = conn_info->writeEventsCount;
}

// Set bytes_sent for this chunk
socket_data_event->bytes_sent = is_send ? chunk_size : -chunk_size;

// Submit this chunk
socket_data_events.perf_submit(ret, socket_data_event, sizeof(struct socket_data_event_t) - MAX_MSG_SIZE + size_to_save);

// Update for next chunk
bytes_remaining -= chunk_size;
current_offset += chunk_size;
}

}

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