netdev - [PATCH] skb: add a comment to skb_csum

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <50FF2F18.1050408@jp.fujitsu.com>
Date:	Wed, 23 Jan 2013 09:30:16 +0900
From:	Koki Sanagi <sanagi.koki@...fujitsu.com>
To:	netdev@...r.kernel.org
CC:	davem@...emloft.net
Subject: [PATCH] skb: add a comment to skb_csum_unnecessary to avoid miuse

Due to its name and appearance, someone thinks this only checks if ip_summed is
CHECKSUM_UNNECESARRY.  But actually, this returns true even if ip_summed is
CHECKSUM_PARTIAL.  To avoid misuse, this patch a comment which specifies that
CHECKSUM_PARTIAL is OK.

Signed-off-by: Koki Sanagi <sanagi.koki@...fujitsu.com>
---
 include/linux/skbuff.h |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 8b2256e..bc41f64 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2522,6 +2522,16 @@ void skb_complete_wifi_ack(struct sk_buff *skb, bool acked);
 extern __sum16 __skb_checksum_complete_head(struct sk_buff *skb, int len);
 extern __sum16 __skb_checksum_complete(struct sk_buff *skb);
 
+/**
+ * skb_csum_unnecessary - check if the checksum needs to be verified
+ * @skb: skb to check
+ *
+ * check if the checksum of this skb needs to be verified.  This function is
+ * effective only against skbs on inbound path.
+ *
+ * NB: This returns true if ip_summed is CHECKSUM_UNNECESSARY or
+ *     CHECKSUM_PARTIAL.
+ **/
 static inline int skb_csum_unnecessary(const struct sk_buff *skb)
 {
 	return skb->ip_summed & CHECKSUM_UNNECESSARY;
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html