[IPV6]: Optimize hop-limit determination.

[deliverable/linux.git] / net / ipv6 / ipv6_sockglue.c

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 8c5f80fd03ada72af490ad8786a3e492a48d3c8c..8e29fb1d1df6a57a1b6eaab0a5a1ffc0e596f6b3 100644 (file)
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -57,118 +57,6 @@
 
 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
 
-static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
-                                                   int proto)
-{
-       struct inet6_protocol *ops = NULL;
-
-       for (;;) {
-               struct ipv6_opt_hdr *opth;
-               int len;
-
-               if (proto != NEXTHDR_HOP) {
-                       ops = rcu_dereference(inet6_protos[proto]);
-
-                       if (unlikely(!ops))
-                               break;
-
-                       if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
-                               break;
-               }
-
-               if (unlikely(!pskb_may_pull(skb, 8)))
-                       break;
-
-               opth = (void *)skb->data;
-               len = opth->hdrlen * 8 + 8;
-
-               if (unlikely(!pskb_may_pull(skb, len)))
-                       break;
-
-               proto = opth->nexthdr;
-               __skb_pull(skb, len);
-       }
-
-       return ops;
-}
-
-static int ipv6_gso_send_check(struct sk_buff *skb)
-{
-       struct ipv6hdr *ipv6h;
-       struct inet6_protocol *ops;
-       int err = -EINVAL;
-
-       if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
-               goto out;
-
-       ipv6h = ipv6_hdr(skb);
-       __skb_pull(skb, sizeof(*ipv6h));
-       err = -EPROTONOSUPPORT;
-
-       rcu_read_lock();
-       ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
-       if (likely(ops && ops->gso_send_check)) {
-               skb_reset_transport_header(skb);
-               err = ops->gso_send_check(skb);
-       }
-       rcu_read_unlock();
-
-out:
-       return err;
-}
-
-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;
-
-       if (!(features & NETIF_F_V6_CSUM))
-               features &= ~NETIF_F_SG;
-
-       if (unlikely(skb_shinfo(skb)->gso_type &
-                    ~(SKB_GSO_UDP |
-                      SKB_GSO_DODGY |
-                      SKB_GSO_TCP_ECN |
-                      SKB_GSO_TCPV6 |
-                      0)))
-               goto out;
-
-       if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
-               goto out;
-
-       ipv6h = ipv6_hdr(skb);
-       __skb_pull(skb, sizeof(*ipv6h));
-       segs = ERR_PTR(-EPROTONOSUPPORT);
-
-       rcu_read_lock();
-       ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
-       if (likely(ops && ops->gso_segment)) {
-               skb_reset_transport_header(skb);
-               segs = ops->gso_segment(skb, features);
-       }
-       rcu_read_unlock();
-
-       if (unlikely(IS_ERR(segs)))
-               goto out;
-
-       for (skb = segs; skb; skb = skb->next) {
-               ipv6h = ipv6_hdr(skb);
-               ipv6h->payload_len = htons(skb->len - skb->mac_len -
-                                          sizeof(*ipv6h));
-       }
-
-out:
-       return segs;
-}
-
-static struct packet_type ipv6_packet_type = {
-       .type = __constant_htons(ETH_P_IPV6),
-       .func = ipv6_rcv,
-       .gso_send_check = ipv6_gso_send_check,
-       .gso_segment = ipv6_gso_segment,
-};
-
 struct ip6_ra_chain *ip6_ra_chain;
 DEFINE_RWLOCK(ip6_ra_lock);
 
@@ -219,6 +107,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
                    char __user *optval, int optlen)
 {
        struct ipv6_pinfo *np = inet6_sk(sk);
+       struct net *net = sk->sk_net;
        int val, valbool;
        int retv = -ENOPROTOOPT;
 
@@ -268,8 +157,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
                                struct inet_connection_sock *icsk = inet_csk(sk);
 
                                local_bh_disable();
-                               sock_prot_dec_use(sk->sk_prot);
-                               sock_prot_inc_use(&tcp_prot);
+                               sock_prot_inuse_add(sk->sk_prot, -1);
+                               sock_prot_inuse_add(&tcp_prot, 1);
                                local_bh_enable();
                                sk->sk_prot = &tcp_prot;
                                icsk->icsk_af_ops = &ipv4_specific;
@@ -282,8 +171,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
                                if (sk->sk_protocol == IPPROTO_UDPLITE)
                                        prot = &udplite_prot;
                                local_bh_disable();
-                               sock_prot_dec_use(sk->sk_prot);
-                               sock_prot_inc_use(prot);
+                               sock_prot_inuse_add(sk->sk_prot, -1);
+                               sock_prot_inuse_add(prot, 1);
                                local_bh_enable();
                                sk->sk_prot = prot;
                                sk->sk_socket->ops = &inet_dgram_ops;
@@ -544,7 +433,7 @@ done:
                        if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
                                goto e_inval;
 
-                       if (__dev_get_by_index(&init_net, val) == NULL) {
+                       if (__dev_get_by_index(net, val) == NULL) {
                                retv = -ENODEV;
                                break;
                        }
@@ -1015,9 +904,7 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
                dst = sk_dst_get(sk);
                if (dst) {
                        if (val < 0)
-                               val = dst_metric(dst, RTAX_HOPLIMIT);
-                       if (val < 0)
-                               val = ipv6_get_hoplimit(dst->dev);
+                               val = ip6_dst_hoplimit(dst);
                        dst_release(dst);
                }
                if (val < 0)
@@ -1128,12 +1015,3 @@ int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
 EXPORT_SYMBOL(compat_ipv6_getsockopt);
 #endif
 
-void __init ipv6_packet_init(void)
-{
-       dev_add_pack(&ipv6_packet_type);
-}
-
-void ipv6_packet_cleanup(void)
-{
-       dev_remove_pack(&ipv6_packet_type);
-}