fix IPv4 header length compulate errors

menglongdong · menglongdong · commit 52e58d45d8bb · 2023-11-23T17:34:29.000+08:00
Signed-off-by: Menglong Dong &lt;imagedong@tencent.com&gt;
diff --git a/shared/bpf/skb_parse.h b/shared/bpf/skb_parse.h
@@ -152,7 +152,7 @@ typedef struct {
 
 static try_inline u8 get_ip_header_len(u8 h)
 {
-	u8 len = (h & 0xF0) * 4;
+	u8 len = (h & 0x0F) * 4;
 	return len > IP_H_LEN ? len: IP_H_LEN;
 }
 

Original file line number	Diff line number	Diff line change
`@@ -152,7 +152,7 @@ typedef struct {`
`152`	`152`
`153`	`153`	`static try_inline u8 get_ip_header_len(u8 h)`
`154`	`154`	`{`
`155`		`- u8 len = (h & 0xF0) * 4;`
	`155`	`+ u8 len = (h & 0x0F) * 4;`
`156`	`156`	`return len > IP_H_LEN ? len: IP_H_LEN;`
`157`	`157`	`}`
`158`	`158`