[IPV6]: Added GSO support for TCPv6

This patch adds GSO support for IPv6 and TCPv6.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 62 insertions, 0 deletions

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 4c20eeb3d568..25f8bf8ac49b 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -58,9 +58,71 @@
 
 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
 
+static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
+{
+        struct sk_buff *segs = ERR_PTR(-EINVAL);
+        struct ipv6hdr *ipv6h;
+        struct inet6_protocol *ops;
+        int proto;
+
+        if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
+                goto out;
+
+        ipv6h = skb->nh.ipv6h;
+        proto = ipv6h->nexthdr;
+        __skb_pull(skb, sizeof(*ipv6h));
+
+        rcu_read_lock();
+        for (;;) {
+                struct ipv6_opt_hdr *opth;
+                int len;
+
+                if (proto != NEXTHDR_HOP) {
+                        ops = rcu_dereference(inet6_protos[proto]);
+
+                        if (unlikely(!ops))
+                                goto unlock;
+
+                        if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
+                                break;
+                }
+
+                if (unlikely(!pskb_may_pull(skb, 8)))
+                        goto unlock;
+
+                opth = (void *)skb->data;
+                len = opth->hdrlen * 8 + 8;
+
+                if (unlikely(!pskb_may_pull(skb, len)))
+                        goto unlock;
+
+                proto = opth->nexthdr;
+                __skb_pull(skb, len);
+        }
+
+        skb->h.raw = skb->data;
+        if (likely(ops->gso_segment))
+                segs = ops->gso_segment(skb, features);
+
+unlock:
+        rcu_read_unlock();
+
+        if (unlikely(IS_ERR(segs)))
+                goto out;
+
+        for (skb = segs; skb; skb = skb->next) {
+                ipv6h = skb->nh.ipv6h;
+                ipv6h->payload_len = htons(skb->len - skb->mac_len);
+        }
+
+out:
+        return segs;
+}
+
 static struct packet_type ipv6_packet_type = {
         .type = __constant_htons(ETH_P_IPV6), 
         .func = ipv6_rcv,
+        .gso_segment = ipv6_gso_segment,
 };
 
 struct ip6_ra_chain *ip6_ra_chain;