ip: Use inline function dst_metric() instead of direct access to dst->metric[]

There are functions to refer to the value of dst->metric[THE_METRIC-1]
directly without use of a inline function "dst_metric" defined in
net/dst.h.

The following patch changes them to use the inline function
consistently.

Signed-off-by: Satoru SATOH <satoru.satoh@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 25 insertions, 24 deletions

diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
index 2f665a51647..f50e88bf266 100644
--- a/net/decnet/dn_route.c
+++ b/net/decnet/dn_route.c
@@ -235,14 +235,14 @@ static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu)
         else
                 min_mtu -= 21;
 
-        if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= min_mtu) {
+        if (dst_metric(dst, RTAX_MTU) > mtu && mtu >= min_mtu) {
                 if (!(dst_metric_locked(dst, RTAX_MTU))) {
                         dst->metrics[RTAX_MTU-1] = mtu;
                         dst_set_expires(dst, dn_rt_mtu_expires);
                 }
                 if (!(dst_metric_locked(dst, RTAX_ADVMSS))) {
                         u32 mss = mtu - DN_MAX_NSP_DATA_HEADER;
-                        if (dst->metrics[RTAX_ADVMSS-1] > mss)
+                        if (dst_metric(dst, RTAX_ADVMSS) > mss)
                                 dst->metrics[RTAX_ADVMSS-1] = mss;
                 }
         }
@@ -805,12 +805,12 @@ static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res)
                 rt->u.dst.neighbour = n;
         }
 
-        if (rt->u.dst.metrics[RTAX_MTU-1] == 0 ||
-            rt->u.dst.metrics[RTAX_MTU-1] > rt->u.dst.dev->mtu)
+        if (dst_metric(&rt->u.dst, RTAX_MTU) == 0 ||
+            dst_metric(&rt->u.dst, RTAX_MTU) > rt->u.dst.dev->mtu)
                 rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu;
         mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->u.dst));
-        if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0 ||
-            rt->u.dst.metrics[RTAX_ADVMSS-1] > mss)
+        if (dst_metric(&rt->u.dst, RTAX_ADVMSS) == 0 ||
+            dst_metric(&rt->u.dst, RTAX_ADVMSS) > mss)
                 rt->u.dst.metrics[RTAX_ADVMSS-1] = mss;
         return 0;
 }
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 9084055a81a..92f90ae46f4 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1468,14 +1468,14 @@ unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph,
 
                                         /* BSD 4.2 compatibility hack :-( */
                                         if (mtu == 0 &&
-                                            old_mtu >= rth->u.dst.metrics[RTAX_MTU-1] &&
+                                            old_mtu >= dst_metric(&rth->u.dst, RTAX_MTU) &&
                                             old_mtu >= 68 + (iph->ihl << 2))
                                                 old_mtu -= iph->ihl << 2;
 
                                         mtu = guess_mtu(old_mtu);
                                 }
-                                if (mtu <= rth->u.dst.metrics[RTAX_MTU-1]) {
-                                        if (mtu < rth->u.dst.metrics[RTAX_MTU-1]) {
+                                if (mtu <= dst_metric(&rth->u.dst, RTAX_MTU)) {
+                                        if (mtu < dst_metric(&rth->u.dst, RTAX_MTU)) {
                                                 dst_confirm(&rth->u.dst);
                                                 if (mtu < ip_rt_min_pmtu) {
                                                         mtu = ip_rt_min_pmtu;
@@ -1497,7 +1497,7 @@ unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph,
 
 static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
 {
-        if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= 68 &&
+        if (dst_metric(dst, RTAX_MTU) > mtu && mtu >= 68 &&
             !(dst_metric_locked(dst, RTAX_MTU))) {
                 if (mtu < ip_rt_min_pmtu) {
                         mtu = ip_rt_min_pmtu;
@@ -1624,14 +1624,14 @@ static void rt_set_nexthop(struct rtable *rt, struct fib_result *res, u32 itag)
         } else
                 rt->u.dst.metrics[RTAX_MTU-1]= rt->u.dst.dev->mtu;
 
-        if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0)
+        if (dst_metric(&rt->u.dst, RTAX_HOPLIMIT) == 0)
                 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = sysctl_ip_default_ttl;
-        if (rt->u.dst.metrics[RTAX_MTU-1] > IP_MAX_MTU)
+        if (dst_metric(&rt->u.dst, RTAX_MTU) > IP_MAX_MTU)
                 rt->u.dst.metrics[RTAX_MTU-1] = IP_MAX_MTU;
-        if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0)
+        if (dst_metric(&rt->u.dst, RTAX_ADVMSS) == 0)
                 rt->u.dst.metrics[RTAX_ADVMSS-1] = max_t(unsigned int, rt->u.dst.dev->mtu - 40,
                                        ip_rt_min_advmss);
-        if (rt->u.dst.metrics[RTAX_ADVMSS-1] > 65535 - 40)
+        if (dst_metric(&rt->u.dst, RTAX_ADVMSS) > 65535 - 40)
                 rt->u.dst.metrics[RTAX_ADVMSS-1] = 65535 - 40;
 
 #ifdef CONFIG_NET_CLS_ROUTE
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index eda4f4a233f..8ac15a604e0 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -66,6 +66,7 @@
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/sysctl.h>
+#include <net/dst.h>
 #include <net/tcp.h>
 #include <net/inet_common.h>
 #include <linux/ipsec.h>
@@ -605,7 +606,7 @@ static u32 tcp_rto_min(struct sock *sk)
         u32 rto_min = TCP_RTO_MIN;
 
         if (dst && dst_metric_locked(dst, RTAX_RTO_MIN))
-                rto_min = dst->metrics[RTAX_RTO_MIN - 1];
+                rto_min = dst_metric(dst, RTAX_RTO_MIN);
         return rto_min;
 }
 
@@ -769,7 +770,7 @@ void tcp_update_metrics(struct sock *sk)
                                 dst->metrics[RTAX_RTTVAR - 1] = m;
                         else
                                 dst->metrics[RTAX_RTTVAR-1] -=
-                                        (dst->metrics[RTAX_RTTVAR-1] - m)>>2;
+                                        (dst_metric(dst, RTAX_RTTVAR) - m)>>2;
                 }
 
                 if (tp->snd_ssthresh >= 0xFFFF) {
@@ -788,21 +789,21 @@ void tcp_update_metrics(struct sock *sk)
                                 dst->metrics[RTAX_SSTHRESH-1] =
                                         max(tp->snd_cwnd >> 1, tp->snd_ssthresh);
                         if (!dst_metric_locked(dst, RTAX_CWND))
-                                dst->metrics[RTAX_CWND-1] = (dst->metrics[RTAX_CWND-1] + tp->snd_cwnd) >> 1;
+                                dst->metrics[RTAX_CWND-1] = (dst_metric(dst, RTAX_CWND) + tp->snd_cwnd) >> 1;
                 } else {
                         /* Else slow start did not finish, cwnd is non-sense,
                            ssthresh may be also invalid.
                          */
                         if (!dst_metric_locked(dst, RTAX_CWND))
-                                dst->metrics[RTAX_CWND-1] = (dst->metrics[RTAX_CWND-1] + tp->snd_ssthresh) >> 1;
-                        if (dst->metrics[RTAX_SSTHRESH-1] &&
+                                dst->metrics[RTAX_CWND-1] = (dst_metric(dst, RTAX_CWND) + tp->snd_ssthresh) >> 1;
+                        if (dst_metric(dst, RTAX_SSTHRESH) &&
                             !dst_metric_locked(dst, RTAX_SSTHRESH) &&
-                            tp->snd_ssthresh > dst->metrics[RTAX_SSTHRESH-1])
+                            tp->snd_ssthresh > dst_metric(dst, RTAX_SSTHRESH))
                                 dst->metrics[RTAX_SSTHRESH-1] = tp->snd_ssthresh;
                 }
 
                 if (!dst_metric_locked(dst, RTAX_REORDERING)) {
-                        if (dst->metrics[RTAX_REORDERING-1] < tp->reordering &&
+                        if (dst_metric(dst, RTAX_REORDERING) < tp->reordering &&
                             tp->reordering != sysctl_tcp_reordering)
                                 dst->metrics[RTAX_REORDERING-1] = tp->reordering;
                 }
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index a493ad9b891..12bba088034 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1243,11 +1243,11 @@ install_route:
                 }
         }
 
-        if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0)
+        if (dst_metric(&rt->u.dst, RTAX_HOPLIMIT) == 0)
                 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
-        if (!rt->u.dst.metrics[RTAX_MTU-1])
+        if (!dst_metric(&rt->u.dst, RTAX_MTU))
                 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev);
-        if (!rt->u.dst.metrics[RTAX_ADVMSS-1])
+        if (!dst_metric(&rt->u.dst, RTAX_ADVMSS))
                 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst));
         rt->u.dst.dev = dev;
         rt->rt6i_idev = idev;