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authorPatrick McHardy <kaber@trash.net>2008-03-20 10:15:53 -0400
committerPatrick McHardy <kaber@trash.net>2008-04-14 05:15:49 -0400
commitd63a650736f566a1f9e9434725d2089597c0d2cc (patch)
treef0a3d5dbc9ced46f95582e4133b55bb70a1ae365 /include
parent6185f870e293a0a3eae5c81eb0106480cf03dfde (diff)
[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 66bc52060fd6..e4c66593b5c6 100644
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -234,6 +234,11 @@ struct nf_afinfo {
234 unsigned short family; 234 unsigned short family;
235 __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook, 235 __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook,
236 unsigned int dataoff, u_int8_t protocol); 236 unsigned int dataoff, u_int8_t protocol);
237 __sum16 (*checksum_partial)(struct sk_buff *skb,
238 unsigned int hook,
239 unsigned int dataoff,
240 unsigned int len,
241 u_int8_t protocol);
237 int (*route)(struct dst_entry **dst, struct flowi *fl); 242 int (*route)(struct dst_entry **dst, struct flowi *fl);
238 void (*saveroute)(const struct sk_buff *skb, 243 void (*saveroute)(const struct sk_buff *skb,
239 struct nf_queue_entry *entry); 244 struct nf_queue_entry *entry);
@@ -263,6 +268,23 @@ nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
263 return csum; 268 return csum;
264} 269}
265 270
271static inline __sum16
272nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
273 unsigned int dataoff, unsigned int len,
274 u_int8_t protocol, unsigned short family)
275{
276 const struct nf_afinfo *afinfo;
277 __sum16 csum = 0;
278
279 rcu_read_lock();
280 afinfo = nf_get_afinfo(family);
281 if (afinfo)
282 csum = afinfo->checksum_partial(skb, hook, dataoff, len,
283 protocol);
284 rcu_read_unlock();
285 return csum;
286}
287
266extern int nf_register_afinfo(const struct nf_afinfo *afinfo); 288extern int nf_register_afinfo(const struct nf_afinfo *afinfo);
267extern void nf_unregister_afinfo(const struct nf_afinfo *afinfo); 289extern void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
268 290