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authorHerbert Xu <herbert@gondor.apana.org.au>2007-03-26 07:10:56 +0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-26 09:23:51 +0400
commit759e5d006462d53fb708daa8284b4ad909415da1 (patch)
treeedcc4e9d975199b3fe5e2aadc3d1e06824755e75 /include/net/udplite.h
parent1ab6eb62b02e0949a392fb19bf31ba59ae1022b1 (diff)
downloadlinux-759e5d006462d53fb708daa8284b4ad909415da1.tar.xz
[UDP]: Clean up UDP-Lite receive checksum
This patch eliminates some duplicate code for the verification of receive checksums between UDP-Lite and UDP. It does this by introducing __skb_checksum_complete_head which is identical to __skb_checksum_complete_head apart from the fact that it takes a length parameter rather than computing the first skb->len bytes. As a result UDP-Lite will be able to use hardware checksum offload for packets which do not use partial coverage checksums. It also means that UDP-Lite loopback no longer does unnecessary checksum verification. If any NICs start support UDP-Lite this would also start working automatically. This patch removes the assumption that msg_flags has MSG_TRUNC clear upon entry in recvmsg. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/udplite.h')
-rw-r--r--include/net/udplite.h39
1 files changed, 6 insertions, 33 deletions
diff --git a/include/net/udplite.h b/include/net/udplite.h
index 67ac51424307..d99df75fe54c 100644
--- a/include/net/udplite.h
+++ b/include/net/udplite.h
@@ -47,11 +47,10 @@ static inline int udplite_checksum_init(struct sk_buff *skb, struct udphdr *uh)
return 1;
}
- UDP_SKB_CB(skb)->partial_cov = 0;
cscov = ntohs(uh->len);
if (cscov == 0) /* Indicates that full coverage is required. */
- cscov = skb->len;
+ ;
else if (cscov < 8 || cscov > skb->len) {
/*
* Coverage length violates RFC 3828: log and discard silently.
@@ -60,42 +59,16 @@ static inline int udplite_checksum_init(struct sk_buff *skb, struct udphdr *uh)
cscov, skb->len);
return 1;
- } else if (cscov < skb->len)
+ } else if (cscov < skb->len) {
UDP_SKB_CB(skb)->partial_cov = 1;
-
- UDP_SKB_CB(skb)->cscov = cscov;
-
- /*
- * There is no known NIC manufacturer supporting UDP-Lite yet,
- * hence ip_summed is always (re-)set to CHECKSUM_NONE.
- */
- skb->ip_summed = CHECKSUM_NONE;
+ UDP_SKB_CB(skb)->cscov = cscov;
+ if (skb->ip_summed == CHECKSUM_COMPLETE)
+ skb->ip_summed = CHECKSUM_NONE;
+ }
return 0;
}
-static __inline__ int udplite4_csum_init(struct sk_buff *skb, struct udphdr *uh)
-{
- int rc = udplite_checksum_init(skb, uh);
-
- if (!rc)
- skb->csum = csum_tcpudp_nofold(skb->nh.iph->saddr,
- skb->nh.iph->daddr,
- skb->len, IPPROTO_UDPLITE, 0);
- return rc;
-}
-
-static __inline__ int udplite6_csum_init(struct sk_buff *skb, struct udphdr *uh)
-{
- int rc = udplite_checksum_init(skb, uh);
-
- if (!rc)
- skb->csum = ~csum_unfold(csum_ipv6_magic(&skb->nh.ipv6h->saddr,
- &skb->nh.ipv6h->daddr,
- skb->len, IPPROTO_UDPLITE, 0));
- return rc;
-}
-
static inline int udplite_sender_cscov(struct udp_sock *up, struct udphdr *uh)
{
int cscov = up->len;