From: kaber@trash.net
To: netfilter-devel@vger.kernel.org
Cc: netdev@vger.kernel.org, kaber@trash.net, ulrich.weber@sophos.com
Subject: [PATCH 11/17] net: core: add function for incremental IPv6 pseudo header checksum updates
Date: Mon, 21 Nov 2011 06:46:03 +0100 [thread overview]
Message-ID: <1321854369-3432-12-git-send-email-kaber@trash.net> (raw)
In-Reply-To: <1321854369-3432-1-git-send-email-kaber@trash.net>
From: Patrick McHardy <kaber@trash.net>
Add inet_proto_csum_replace16 for incrementally updating IPv6 pseudo header
checksums for IPv6 NAT.
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
include/net/checksum.h | 3 +++
net/core/utils.c | 20 ++++++++++++++++++++
2 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/include/net/checksum.h b/include/net/checksum.h
index ba55d8b..600d1d7 100644
--- a/include/net/checksum.h
+++ b/include/net/checksum.h
@@ -109,6 +109,9 @@ static inline void csum_replace2(__sum16 *sum, __be16 from, __be16 to)
struct sk_buff;
extern void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
__be32 from, __be32 to, int pseudohdr);
+extern void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb,
+ const __be32 *from, const __be32 *to,
+ int pseudohdr);
static inline void inet_proto_csum_replace2(__sum16 *sum, struct sk_buff *skb,
__be16 from, __be16 to,
diff --git a/net/core/utils.c b/net/core/utils.c
index 386e263..b09a73a 100644
--- a/net/core/utils.c
+++ b/net/core/utils.c
@@ -298,6 +298,26 @@ void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
}
EXPORT_SYMBOL(inet_proto_csum_replace4);
+void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb,
+ const __be32 *from, const __be32 *to,
+ int pseudohdr)
+{
+ __be32 diff[] = {
+ ~from[0], ~from[1], ~from[2], ~from[3],
+ to[0], to[1], to[2], to[3],
+ };
+ if (skb->ip_summed != CHECKSUM_PARTIAL) {
+ *sum = csum_fold(csum_partial(diff, sizeof(diff),
+ ~csum_unfold(*sum)));
+ if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
+ skb->csum = ~csum_partial(diff, sizeof(diff),
+ ~skb->csum);
+ } else if (pseudohdr)
+ *sum = ~csum_fold(csum_partial(diff, sizeof(diff),
+ csum_unfold(*sum)));
+}
+EXPORT_SYMBOL(inet_proto_csum_replace16);
+
int mac_pton(const char *s, u8 *mac)
{
int i;
--
1.7.1
next prev parent reply other threads:[~2011-11-21 5:46 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-21 5:45 [RFC PATCH 00/17] netfilter: IPv6 NAT kaber
2011-11-21 5:45 ` [PATCH 01/17] netfilter: nf_nat: use hash random for bysource hash kaber
2011-11-21 7:43 ` Eric Dumazet
2011-11-21 5:45 ` [PATCH 02/17] netfilter: nat: remove module reference counting from NAT protocols kaber
2011-11-21 7:36 ` Eric Dumazet
2011-11-21 14:59 ` Patrick McHardy
2011-11-21 5:45 ` [PATCH 03/17] netfilter: nf_nat: export NAT definitions to userspace kaber
2011-11-21 5:45 ` [PATCH 04/17] netfilter: nf_nat: remove obsolete code from nf_nat_icmp_reply_translation() kaber
2011-11-21 5:45 ` [PATCH 05/17] netfilter: nf_nat: remove obsolete check in nf_nat_mangle_udp_packet() kaber
2011-11-21 5:45 ` [PATCH 06/17] netfilter: ctnetlink: remove dead NAT code kaber
2011-11-21 5:45 ` [PATCH 07/17] netfilter: conntrack: restrict NAT helper invocation to IPv4 kaber
2011-11-21 5:46 ` [PATCH 08/17] netfilter: nf_nat: add protoff argument to packet mangling functions kaber
2011-11-21 5:46 ` [PATCH 09/17] netfilter: add protocol independant NAT core kaber
2011-11-21 5:46 ` [PATCH 10/17] netfilter: ipv6: expand skb head in ip6_route_me_harder after oif change kaber
2011-11-21 10:29 ` Eric Dumazet
2011-11-21 15:00 ` Patrick McHardy
2011-11-21 5:46 ` kaber [this message]
2011-11-21 5:46 ` [PATCH 12/17] netfilter: ipv6: add IPv6 NAT support kaber
2011-11-21 5:46 ` [PATCH 13/17] netfilter: ip6tables: add MASQUERADE target kaber
2011-11-21 5:46 ` [PATCH 14/17] netfilter: ip6tables: add REDIRECT target kaber
2011-11-21 5:46 ` [PATCH 15/17] netfilter: ip6tables: add NETMAP target kaber
2011-11-21 5:46 ` [PATCH 16/17] netfilter: nf_nat: support IPv6 in FTP NAT helper kaber
2011-11-21 5:46 ` [PATCH 17/17] netfilter: nf_nat: support IPv6 in amanda " kaber
2011-11-21 13:05 ` [RFC PATCH 00/17] netfilter: IPv6 NAT Jan Engelhardt
2011-11-21 17:01 ` Patrick McHardy
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