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authorPatrick McHardy <kaber@trash.net>2008-03-20 15:15:53 +0100
committerPatrick McHardy <kaber@trash.net>2008-04-14 11:15:49 +0200
commitd63a650736f566a1f9e9434725d2089597c0d2cc (patch)
treef0a3d5dbc9ced46f95582e4133b55bb70a1ae365 /include
parent6185f870e293a0a3eae5c81eb0106480cf03dfde (diff)
downloadop-kernel-dev-d63a650736f566a1f9e9434725d2089597c0d2cc.zip
op-kernel-dev-d63a650736f566a1f9e9434725d2089597c0d2cc.tar.gz
[NETFILTER]: Add partial checksum validation helper
Move the UDP-Lite conntrack checksum validation to a generic helper similar to nf_checksum() and make it fall back to nf_checksum() in case the full packet is to be checksummed and hardware checksums are available. This is to be used by DCCP conntrack, which also needs to verify partial checksums. Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/netfilter.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
index 66bc520..e4c6659 100644
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -234,6 +234,11 @@ struct nf_afinfo {
unsigned short family;
__sum16 (*checksum)(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, u_int8_t protocol);
+ __sum16 (*checksum_partial)(struct sk_buff *skb,
+ unsigned int hook,
+ unsigned int dataoff,
+ unsigned int len,
+ u_int8_t protocol);
int (*route)(struct dst_entry **dst, struct flowi *fl);
void (*saveroute)(const struct sk_buff *skb,
struct nf_queue_entry *entry);
@@ -263,6 +268,23 @@ nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
return csum;
}
+static inline __sum16
+nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
+ unsigned int dataoff, unsigned int len,
+ u_int8_t protocol, unsigned short family)
+{
+ const struct nf_afinfo *afinfo;
+ __sum16 csum = 0;
+
+ rcu_read_lock();
+ afinfo = nf_get_afinfo(family);
+ if (afinfo)
+ csum = afinfo->checksum_partial(skb, hook, dataoff, len,
+ protocol);
+ rcu_read_unlock();
+ return csum;
+}
+
extern int nf_register_afinfo(const struct nf_afinfo *afinfo);
extern void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
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