ipvs: Pull out update_pmtu code

Another step toward heterogeneous pools, this removes another piece of
functionality currently specific to each address family type.

Signed-off-by: Alex Gartrell <agartrell@fb.com>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>

diff --git a/net/netfilter/ipvs/ip_vs_xmit.c b/net/netfilter/ipvs/ip_vs_xmit.c
index b3b54d7..034a282 100644 (file)
--- a/net/netfilter/ipvs/ip_vs_xmit.c
+++ b/net/netfilter/ipvs/ip_vs_xmit.c
@@ -204,6 +204,15 @@ static inline bool crosses_local_route_boundary(int skb_af, struct sk_buff *skb,
        return false;
 }
 
+static inline void maybe_update_pmtu(int skb_af, struct sk_buff *skb, int mtu)
+{
+       struct sock *sk = skb->sk;
+       struct rtable *ort = skb_rtable(skb);
+
+       if (!skb->dev && sk && sk->sk_state != TCP_TIME_WAIT)
+               ort->dst.ops->update_pmtu(&ort->dst, sk, NULL, mtu);
+}
+
 /* Get route to destination or remote server */
 static int
 __ip_vs_get_out_rt(int skb_af, struct sk_buff *skb, struct ip_vs_dest *dest,
@@ -213,7 +222,6 @@ __ip_vs_get_out_rt(int skb_af, struct sk_buff *skb, struct ip_vs_dest *dest,
        struct netns_ipvs *ipvs = net_ipvs(net);
        struct ip_vs_dest_dst *dest_dst;
        struct rtable *rt;                      /* Route to the other host */
-       struct rtable *ort;                     /* Original route */
        struct iphdr *iph;
        __be16 df;
        int mtu;
@@ -284,16 +292,12 @@ __ip_vs_get_out_rt(int skb_af, struct sk_buff *skb, struct ip_vs_dest *dest,
                mtu = dst_mtu(&rt->dst);
                df = iph->frag_off & htons(IP_DF);
        } else {
-               struct sock *sk = skb->sk;
-
                mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
                if (mtu < 68) {
                        IP_VS_DBG_RL("%s(): mtu less than 68\n", __func__);
                        goto err_put;
                }
-               ort = skb_rtable(skb);
-               if (!skb->dev && sk && sk->sk_state != TCP_TIME_WAIT)
-                       ort->dst.ops->update_pmtu(&ort->dst, sk, NULL, mtu);
+               maybe_update_pmtu(skb_af, skb, mtu);
                /* MTU check allowed? */
                df = sysctl_pmtu_disc(ipvs) ? iph->frag_off & htons(IP_DF) : 0;
        }
@@ -372,7 +376,6 @@ __ip_vs_get_out_rt_v6(int skb_af, struct sk_buff *skb, struct ip_vs_dest *dest,
        struct net *net = dev_net(skb_dst(skb)->dev);
        struct ip_vs_dest_dst *dest_dst;
        struct rt6_info *rt;                    /* Route to the other host */
-       struct rt6_info *ort;                   /* Original route */
        struct dst_entry *dst;
        int mtu;
        int local, noref = 1;
@@ -438,17 +441,13 @@ __ip_vs_get_out_rt_v6(int skb_af, struct sk_buff *skb, struct ip_vs_dest *dest,
        if (likely(!(rt_mode & IP_VS_RT_MODE_TUNNEL)))
                mtu = dst_mtu(&rt->dst);
        else {
-               struct sock *sk = skb->sk;
-
                mtu = dst_mtu(&rt->dst) - sizeof(struct ipv6hdr);
                if (mtu < IPV6_MIN_MTU) {
                        IP_VS_DBG_RL("%s(): mtu less than %d\n", __func__,
                                     IPV6_MIN_MTU);
                        goto err_put;
                }
-               ort = (struct rt6_info *) skb_dst(skb);
-               if (!skb->dev && sk && sk->sk_state != TCP_TIME_WAIT)
-                       ort->dst.ops->update_pmtu(&ort->dst, sk, NULL, mtu);
+               maybe_update_pmtu(skb_af, skb, mtu);
        }
 
        if (unlikely(__mtu_check_toobig_v6(skb, mtu))) {