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authorTom Herbert <therbert@google.com>2014-08-31 15:12:43 -0700
committerDavid S. Miller <davem@davemloft.net>2014-09-01 21:36:28 -0700
commit2abb7cdc0dc84e99b76ef983a1ae1978922aa9b3 (patch)
tree9bf6029678d74ef6ad12e832d48d769caf88a4ed /net/ipv4/udp.c
parentd96535a17dbbafd567961d14c08c0984ddda9c3c (diff)
downloadlwn-2abb7cdc0dc84e99b76ef983a1ae1978922aa9b3.tar.gz
lwn-2abb7cdc0dc84e99b76ef983a1ae1978922aa9b3.zip
udp: Add support for doing checksum unnecessary conversion
Add support for doing CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion in UDP tunneling path. In the normal UDP path, we call skb_checksum_try_convert after locating the UDP socket. The check is that checksum conversion is enabled for the socket (new flag in UDP socket) and that checksum field is non-zero. In the UDP GRO path, we call skb_gro_checksum_try_convert after checksum is validated and checksum field is non-zero. Since this is already in GRO we assume that checksum conversion is always wanted. Signed-off-by: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/udp.c')
-rw-r--r--net/ipv4/udp.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 3549c21fe5f7..0da3849fd35b 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1788,6 +1788,10 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
if (sk != NULL) {
int ret;
+ if (udp_sk(sk)->convert_csum && uh->check && !IS_UDPLITE(sk))
+ skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
+ inet_compute_pseudo);
+
ret = udp_queue_rcv_skb(sk, skb);
sock_put(sk);