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authorTom Herbert <therbert@google.com>2014-09-20 14:52:29 -0700
committerDavid S. Miller <davem@davemloft.net>2014-09-26 00:22:46 -0400
commitf71470b37e79d6eb151debd47364d920b7babd30 (patch)
treecef41e3672ce144ddb9d251afc93190dcc3931c8 /net/ipv4/udp_offload.c
parentd020f8f73318589bf41f864b7f89f95669350873 (diff)
downloadlinux-f71470b37e79d6eb151debd47364d920b7babd30.tar.bz2
udp: move logic out of udp[46]_ufo_send_check
In udp[46]_ufo_send_check the UDP checksum initialized to the pseudo header checksum. We can move this logic into udp[46]_ufo_fragment. After this change udp[64]_ufo_send_check is a no-op. Signed-off-by: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/udp_offload.c')
-rw-r--r--net/ipv4/udp_offload.c37
1 files changed, 15 insertions, 22 deletions
diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index d7c43f764c71..2918cc914824 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -27,23 +27,6 @@ struct udp_offload_priv {
static int udp4_ufo_send_check(struct sk_buff *skb)
{
- if (!pskb_may_pull(skb, sizeof(struct udphdr)))
- return -EINVAL;
-
- if (likely(!skb->encapsulation)) {
- const struct iphdr *iph;
- struct udphdr *uh;
-
- iph = ip_hdr(skb);
- uh = udp_hdr(skb);
-
- uh->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len,
- IPPROTO_UDP, 0);
- skb->csum_start = skb_transport_header(skb) - skb->head;
- skb->csum_offset = offsetof(struct udphdr, check);
- skb->ip_summed = CHECKSUM_PARTIAL;
- }
-
return 0;
}
@@ -128,8 +111,9 @@ static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
{
struct sk_buff *segs = ERR_PTR(-EINVAL);
unsigned int mss;
- int offset;
__wsum csum;
+ struct udphdr *uh;
+ struct iphdr *iph;
if (skb->encapsulation &&
(skb_shinfo(skb)->gso_type &
@@ -138,6 +122,9 @@ static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
goto out;
}
+ if (!pskb_may_pull(skb, sizeof(struct udphdr)))
+ goto out;
+
mss = skb_shinfo(skb)->gso_size;
if (unlikely(skb->len <= mss))
goto out;
@@ -165,10 +152,16 @@ static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
* HW cannot do checksum of UDP packets sent as multiple
* IP fragments.
*/
- offset = skb_checksum_start_offset(skb);
- csum = skb_checksum(skb, offset, skb->len - offset, 0);
- offset += skb->csum_offset;
- *(__sum16 *)(skb->data + offset) = csum_fold(csum);
+
+ uh = udp_hdr(skb);
+ iph = ip_hdr(skb);
+
+ uh->check = 0;
+ csum = skb_checksum(skb, 0, skb->len, 0);
+ uh->check = udp_v4_check(skb->len, iph->saddr, iph->daddr, csum);
+ if (uh->check == 0)
+ uh->check = CSUM_MANGLED_0;
+
skb->ip_summed = CHECKSUM_NONE;
/* Fragment the skb. IP headers of the fragments are updated in