Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux...

[pandora-kernel.git] / net / ipv4 / af_inet.c

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 0a27745..318d467 100644 (file)
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -68,6 +68,7 @@
  */
 
 #include <linux/config.h>
+#include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/types.h>
 #include <linux/socket.h>
@@ -1096,6 +1097,62 @@ int inet_sk_rebuild_header(struct sock *sk)
 
 EXPORT_SYMBOL(inet_sk_rebuild_header);
 
+static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features)
+{
+       struct sk_buff *segs = ERR_PTR(-EINVAL);
+       struct iphdr *iph;
+       struct net_protocol *ops;
+       int proto;
+       int ihl;
+       int id;
+
+       if (unlikely(skb_shinfo(skb)->gso_type &
+                    ~(SKB_GSO_TCPV4 |
+                      SKB_GSO_UDP |
+                      SKB_GSO_DODGY |
+                      SKB_GSO_TCP_ECN |
+                      0)))
+               goto out;
+
+       if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
+               goto out;
+
+       iph = skb->nh.iph;
+       ihl = iph->ihl * 4;
+       if (ihl < sizeof(*iph))
+               goto out;
+
+       if (unlikely(!pskb_may_pull(skb, ihl)))
+               goto out;
+
+       skb->h.raw = __skb_pull(skb, ihl);
+       iph = skb->nh.iph;
+       id = ntohs(iph->id);
+       proto = iph->protocol & (MAX_INET_PROTOS - 1);
+       segs = ERR_PTR(-EPROTONOSUPPORT);
+
+       rcu_read_lock();
+       ops = rcu_dereference(inet_protos[proto]);
+       if (likely(ops && ops->gso_segment))
+               segs = ops->gso_segment(skb, features);
+       rcu_read_unlock();
+
+       if (!segs || unlikely(IS_ERR(segs)))
+               goto out;
+
+       skb = segs;
+       do {
+               iph = skb->nh.iph;
+               iph->id = htons(id++);
+               iph->tot_len = htons(skb->len - skb->mac_len);
+               iph->check = 0;
+               iph->check = ip_fast_csum(skb->nh.raw, iph->ihl);
+       } while ((skb = skb->next));
+
+out:
+       return segs;
+}
+
 #ifdef CONFIG_IP_MULTICAST
 static struct net_protocol igmp_protocol = {
        .handler =      igmp_rcv,
@@ -1105,6 +1162,7 @@ static struct net_protocol igmp_protocol = {
 static struct net_protocol tcp_protocol = {
        .handler =      tcp_v4_rcv,
        .err_handler =  tcp_v4_err,
+       .gso_segment =  tcp_tso_segment,
        .no_policy =    1,
 };
 
@@ -1150,6 +1208,7 @@ static int ipv4_proc_init(void);
 static struct packet_type ip_packet_type = {
        .type = __constant_htons(ETH_P_IP),
        .func = ip_rcv,
+       .gso_segment = inet_gso_segment,
 };
 
 static int __init inet_init(void)