netdev - [PATCH v4 net-next 1/2] net: introduce skb_postpush

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]

Date:	Fri, 10 Apr 2015 16:33:11 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Eric Dumazet <edumazet@...gle.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	Thomas Graf <tgraf@...g.ch>, Jiri Pirko <jiri@...nulli.us>,
	Jamal Hadi Salim <jhs@...atatu.com>, netdev@...r.kernel.org
Subject: [PATCH v4 net-next 1/2] net: introduce skb_postpush_rcsum() helper

similar to skb_postpull_rcsum() introduce skb_postpush_rcsum() helper

Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>
---

next patch is also using skb_postpush_rcsum()

 include/linux/skbuff.h |   13 +++++++++++++
 net/core/filter.c      |    4 ++--
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 0991259643d6..049c2db872e0 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2592,6 +2592,19 @@ static inline void skb_postpull_rcsum(struct sk_buff *skb,
 		skb->csum = csum_sub(skb->csum, csum_partial(start, len, 0));
 }
 
+/**
+ *	skb_postpush_rcsum - update checksum for skb after push
+ *	@skb: buffer to update
+ *	@start: start of data after push
+ *	@len: length of data pushed
+ */
+static inline void skb_postpush_rcsum(struct sk_buff *skb,
+				      const void *start, unsigned int len)
+{
+	if (skb->ip_summed == CHECKSUM_COMPLETE)
+		skb->csum = csum_add(skb->csum, csum_partial(start, len, 0));
+}
+
 unsigned char *skb_pull_rcsum(struct sk_buff *skb, unsigned int len);
 
 /**
diff --git a/net/core/filter.c b/net/core/filter.c
index b669e75d2b36..e5872704c28b 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -1213,8 +1213,8 @@ static u64 bpf_skb_store_bytes(u64 r1, u64 r2, u64 r3, u64 r4, u64 flags)
 		/* skb_store_bits cannot return -EFAULT here */
 		skb_store_bits(skb, offset, ptr, len);
 
-	if (BPF_RECOMPUTE_CSUM(flags) && skb->ip_summed == CHECKSUM_COMPLETE)
-		skb->csum = csum_add(skb->csum, csum_partial(ptr, len, 0));
+	if (BPF_RECOMPUTE_CSUM(flags))
+		skb_postpush_rcsum(skb, ptr, len);
 	return 0;
 }
 
-- 
1.7.9.5

--
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