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tcp基本框架

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impact-eintr
2022-12-05 11:28:59 +08:00
parent b576c7e261
commit f3ceda183b
7 changed files with 271 additions and 27 deletions
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5
tcpip/network/fragmentation/frag_heap.go
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@@ -17,6 +17,7 @@ package fragmentation
import (
"container/heap"
"fmt"
"log"
"netstack/tcpip/buffer"
)
@@ -58,6 +59,7 @@ func (h *fragHeap) reassemble() (buffer.VectorisedView, error) {
curr := heap.Pop(h).(fragment)
views := curr.vv.Views()
size := curr.vv.Size()
log.Println(size)
if curr.offset != 0 {
return buffer.VectorisedView{}, fmt.Errorf("offset of the first packet is != 0 (%d)", curr.offset)
@@ -66,10 +68,11 @@ func (h *fragHeap) reassemble() (buffer.VectorisedView, error) {
for h.Len() > 0 {
curr := heap.Pop(h).(fragment)
if int(curr.offset) < size {
curr.vv.TrimFront(size - int(curr.offset))
curr.vv.TrimFront(size - int(curr.offset)) // 截取重复的部分
} else if int(curr.offset) > size {
return buffer.VectorisedView{}, fmt.Errorf("packet has a hole, expected offset %d, got %d", size, curr.offset)
}
// curr.offset == size 没有空洞 紧密排布
size += curr.vv.Size()
views = append(views, curr.vv.Views()...)
}