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ipv6: Add generic UDP Tunnel segmentation 

Similar to commit 7313626745
(tunneling: Add generic Tunnel segmentation)

This patch adds generic tunneling offloading support for
IPv6-UDP based tunnels.

This can be used by tunneling protocols like VXLAN.

Cc: Jesse Gross <jesse@nicira.com>
Cc: Pravin B Shelar <pshelar@nicira.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2013-08-31 13:44:37 +08:00 committed by David S. Miller
parent f564f45c45
commit d949d826c0
2 changed files with 110 additions and 51 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
net/ipv6/ip6_offload.c
View File

@ -91,6 +91,7 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
unsigned int unfrag_ip6hlen;
u8 *prevhdr;
int offset = 0;
bool tunnel;
if (unlikely(skb_shinfo(skb)->gso_type &
~(SKB_GSO_UDP |
@ -106,6 +107,7 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
goto out;
tunnel = skb->encapsulation;
ipv6h = ipv6_hdr(skb);
__skb_pull(skb, sizeof(*ipv6h));
segs = ERR_PTR(-EPROTONOSUPPORT);
@ -126,7 +128,7 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
ipv6h = ipv6_hdr(skb);
ipv6h->payload_len = htons(skb->len - skb->mac_len -
sizeof(*ipv6h));
if (proto == IPPROTO_UDP) {
if (!tunnel && proto == IPPROTO_UDP) {
unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
fptr = (struct frag_hdr *)(skb_network_header(skb) +
unfrag_ip6hlen);

65
net/ipv6/udp_offload.c
View File

@ -21,13 +21,10 @@ static int udp6_ufo_send_check(struct sk_buff *skb)
const struct ipv6hdr *ipv6h;
struct udphdr *uh;
/* UDP Tunnel offload on ipv6 is not yet supported. */
if (skb->encapsulation)
return -EINVAL;
if (!pskb_may_pull(skb, sizeof(*uh)))
return -EINVAL;
if (likely(!skb->encapsulation)) {
ipv6h = ipv6_hdr(skb);
uh = udp_hdr(skb);
@ -36,9 +33,65 @@ static int udp6_ufo_send_check(struct sk_buff *skb)
skb->csum_start = skb_transport_header(skb) - skb->head;
skb->csum_offset = offsetof(struct udphdr, check);
skb->ip_summed = CHECKSUM_PARTIAL;
}
return 0;
}
static struct sk_buff *skb_udp6_tunnel_segment(struct sk_buff *skb,
netdev_features_t features)
{
struct sk_buff *segs = ERR_PTR(-EINVAL);
int mac_len = skb->mac_len;
int tnl_hlen = skb_inner_mac_header(skb) - skb_transport_header(skb);
int outer_hlen;
netdev_features_t enc_features;
if (unlikely(!pskb_may_pull(skb, tnl_hlen)))
goto out;
skb->encapsulation = 0;
__skb_pull(skb, tnl_hlen);
skb_reset_mac_header(skb);
skb_set_network_header(skb, skb_inner_network_offset(skb));
skb->mac_len = skb_inner_network_offset(skb);
/* segment inner packet. */
enc_features = skb->dev->hw_enc_features & netif_skb_features(skb);
segs = skb_mac_gso_segment(skb, enc_features);
if (!segs || IS_ERR(segs))
goto out;
outer_hlen = skb_tnl_header_len(skb);
skb = segs;
do {
struct udphdr *uh;
struct ipv6hdr *ipv6h;
int udp_offset = outer_hlen - tnl_hlen;
u32 len;
skb->mac_len = mac_len;
skb_push(skb, outer_hlen);
skb_reset_mac_header(skb);
skb_set_network_header(skb, mac_len);
skb_set_transport_header(skb, udp_offset);
uh = udp_hdr(skb);
uh->len = htons(skb->len - udp_offset);
ipv6h = ipv6_hdr(skb);
len = skb->len - udp_offset;
uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr,
len, IPPROTO_UDP, 0);
uh->check = csum_fold(skb_checksum(skb, udp_offset, len, 0));
if (uh->check == 0)
uh->check = CSUM_MANGLED_0;
skb->ip_summed = CHECKSUM_NONE;
} while ((skb = skb->next));
out:
return segs;
}
static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
netdev_features_t features)
{
@ -75,6 +128,9 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
goto out;
}
if (skb->encapsulation && skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL)
segs = skb_udp6_tunnel_segment(skb, features);
else {
/* Do software UFO. Complete and fill in the UDP checksum as HW cannot
* do checksum of UDP packets sent as multiple IP fragments.
*/
@ -115,6 +171,7 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
* fragment header are updated in ipv6_gso_segment()
*/
segs = skb_segment(skb, features);
}
out:
return segs;