diff options
| author | Tom Herbert <therbert@google.com> | 2014-09-20 14:52:29 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-09-26 00:22:46 -0400 |
| commit | f71470b37e79d6eb151debd47364d920b7babd30 (patch) | |
| tree | cef41e3672ce144ddb9d251afc93190dcc3931c8 /net/ipv4/udp_offload.c | |
| parent | d020f8f73318589bf41f864b7f89f95669350873 (diff) | |
| download | linux-f71470b37e79d6eb151debd47364d920b7babd30.tar.gz linux-f71470b37e79d6eb151debd47364d920b7babd30.tar.xz | |
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.c | 37 |
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 |