inet: Create and use rt{,6}_get_peer_create().

There's a lot of places that open-code rt{,6}_get_peer() only because
they want to set 'create' to one.  So add an rt{,6}_get_peer_create()
for their sake.

There were also a few spots open-coding plain rt{,6}_get_peer() and
those are transformed here as well.

Signed-off-by: David S. Miller <davem@davemloft.net>

8 files changed, 24 insertions, 52 deletions

diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index c75efbdc71cb..0c78ef1e5dde 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -253,9 +253,8 @@ static inline bool icmpv4_xrlim_allow(struct net *net, struct rtable *rt,
 
         /* Limit if icmp type is enabled in ratemask. */
         if ((1 << type) & net->ipv4.sysctl_icmp_ratemask) {
-                if (!rt->peer)
-                        rt_bind_peer(rt, fl4->daddr, 1);
-                rc = inet_peer_xrlim_allow(rt->peer,
+                struct inet_peer *peer = rt_get_peer_create(rt, fl4->daddr);
+                rc = inet_peer_xrlim_allow(peer,
                                            net->ipv4.sysctl_icmp_ratelimit);
         }
 out:
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 2c9f73f3b7cc..7a4d724765e6 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -162,10 +162,7 @@ static u32 *ipv4_cow_metrics(struct dst_entry *dst, unsigned long old)
         struct inet_peer *peer;
         u32 *p = NULL;
 
-        if (!rt->peer)
-                rt_bind_peer(rt, rt->rt_dst, 1);
-
-        peer = rt->peer;
+        peer = rt_get_peer_create(rt, rt->rt_dst);
         if (peer) {
                 u32 *old_p = __DST_METRICS_PTR(old);
                 unsigned long prev, new;
@@ -1364,14 +1361,13 @@ void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more)
         struct rtable *rt = (struct rtable *) dst;
 
         if (rt && !(rt->dst.flags & DST_NOPEER)) {
-                if (rt->peer == NULL)
-                        rt_bind_peer(rt, rt->rt_dst, 1);
+                struct inet_peer *peer = rt_get_peer_create(rt, rt->rt_dst);
 
                 /* If peer is attached to destination, it is never detached,
                    so that we need not to grab a lock to dereference it.
                  */
-                if (rt->peer) {
-                        iph->id = htons(inet_getid(rt->peer, more));
+                if (peer) {
+                        iph->id = htons(inet_getid(peer, more));
                         return;
                 }
         } else if (!rt)
@@ -1481,10 +1477,7 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
                                     rt->rt_gateway != old_gw)
                                         continue;
 
-                                if (!rt->peer)
-                                        rt_bind_peer(rt, rt->rt_dst, 1);
-
-                                peer = rt->peer;
+                                peer = rt_get_peer_create(rt, rt->rt_dst);
                                 if (peer) {
                                         if (peer->redirect_learned.a4 != new_gw) {
                                                 peer->redirect_learned.a4 = new_gw;
@@ -1579,9 +1572,7 @@ void ip_rt_send_redirect(struct sk_buff *skb)
         log_martians = IN_DEV_LOG_MARTIANS(in_dev);
         rcu_read_unlock();
 
-        if (!rt->peer)
-                rt_bind_peer(rt, rt->rt_dst, 1);
-        peer = rt->peer;
+        peer = rt_get_peer_create(rt, rt->rt_dst);
         if (!peer) {
                 icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway);
                 return;
@@ -1646,9 +1637,7 @@ static int ip_error(struct sk_buff *skb)
                 break;
         }
 
-        if (!rt->peer)
-                rt_bind_peer(rt, rt->rt_dst, 1);
-        peer = rt->peer;
+        peer = rt_get_peer_create(rt, rt->rt_dst);
 
         send = true;
         if (peer) {
@@ -1754,9 +1743,7 @@ static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
 
         dst_confirm(dst);
 
-        if (!rt->peer)
-                rt_bind_peer(rt, rt->rt_dst, 1);
-        peer = rt->peer;
+        peer = rt_get_peer_create(rt, rt->rt_dst);
         if (peer) {
                 unsigned long pmtu_expires = ACCESS_ONCE(peer->pmtu_expires);
 
@@ -1782,12 +1769,8 @@ static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
 static void ipv4_validate_peer(struct rtable *rt)
 {
         if (rt->rt_peer_genid != rt_peer_genid()) {
-                struct inet_peer *peer;
-
-                if (!rt->peer)
-                        rt_bind_peer(rt, rt->rt_dst, 0);
+                struct inet_peer *peer = rt_get_peer(rt, rt->rt_dst);
 
-                peer = rt->peer;
                 if (peer) {
                         check_peer_pmtu(&rt->dst, peer);
 
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index f485b451f928..833e8d96a636 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1832,9 +1832,7 @@ struct inet_peer *tcp_v4_get_peer(struct sock *sk, bool *release_it)
                 peer = inet_getpeer_v4(net, inet->inet_daddr, 1);
                 *release_it = true;
         } else {
-                if (!rt->peer)
-                        rt_bind_peer(rt, inet->inet_daddr, 1);
-                peer = rt->peer;
+                peer = rt_get_peer_create(rt, inet->inet_daddr);
                 *release_it = false;
         }
 
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 091a2971c7b7..ed89bba745a1 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -188,14 +188,14 @@ static inline bool icmpv6_xrlim_allow(struct sock *sk, u8 type,
         } else {
                 struct rt6_info *rt = (struct rt6_info *)dst;
                 int tmo = net->ipv6.sysctl.icmpv6_time;
+                struct inet_peer *peer;
 
                 /* Give more bandwidth to wider prefixes. */
                 if (rt->rt6i_dst.plen < 128)
                         tmo >>= ((128 - rt->rt6i_dst.plen)>>5);
 
-                if (!rt->rt6i_peer)
-                        rt6_bind_peer(rt, 1);
-                res = inet_peer_xrlim_allow(rt->rt6i_peer, tmo);
+                peer = rt6_get_peer_create(rt);
+                res = inet_peer_xrlim_allow(peer, tmo);
         }
         dst_release(dst);
         return res;
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 17b8c67998bb..62fcf3e48aca 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -463,6 +463,7 @@ int ip6_forward(struct sk_buff *skb)
          */
         if (skb->dev == dst->dev && opt->srcrt == 0 && !skb_sec_path(skb)) {
                 struct in6_addr *target = NULL;
+                struct inet_peer *peer;
                 struct rt6_info *rt;
 
                 /*
@@ -476,13 +477,12 @@ int ip6_forward(struct sk_buff *skb)
                 else
                         target = &hdr->daddr;
 
-                if (!rt->rt6i_peer)
-                        rt6_bind_peer(rt, 1);
+                peer = rt6_get_peer_create(rt);
 
                 /* Limit redirects both by destination (here)
                    and by source (inside ndisc_send_redirect)
                  */
-                if (inet_peer_xrlim_allow(rt->rt6i_peer, 1*HZ))
+                if (inet_peer_xrlim_allow(peer, 1*HZ))
                         ndisc_send_redirect(skb, target);
         } else {
                 int addrtype = ipv6_addr_type(&hdr->saddr);
@@ -602,11 +602,8 @@ void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt)
         int old, new;
 
         if (rt && !(rt->dst.flags & DST_NOPEER)) {
-                struct inet_peer *peer;
+                struct inet_peer *peer = rt6_get_peer_create(rt);
 
-                if (!rt->rt6i_peer)
-                        rt6_bind_peer(rt, 1);
-                peer = rt->rt6i_peer;
                 if (peer) {
                         fhdr->identification = htonl(inet_getid(peer, 0));
                         return;
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 54f62d3b8dd6..69a6330dea91 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1472,6 +1472,7 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
         struct net *net = dev_net(dev);
         struct sock *sk = net->ipv6.ndisc_sk;
         int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
+        struct inet_peer *peer;
         struct sk_buff *buff;
         struct icmp6hdr *icmph;
         struct in6_addr saddr_buf;
@@ -1518,9 +1519,8 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
                           "Redirect: destination is not a neighbour\n");
                 goto release;
         }
-        if (!rt->rt6i_peer)
-                rt6_bind_peer(rt, 1);
-        if (!inet_peer_xrlim_allow(rt->rt6i_peer, 1*HZ))
+        peer = rt6_get_peer_create(rt);
+        if (!inet_peer_xrlim_allow(peer, 1*HZ))
                 goto release;
 
         if (dev->addr_len) {
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 4eca0130cce7..8a986be4aeda 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -99,10 +99,7 @@ static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
         if (!(rt->dst.flags & DST_HOST))
                 return NULL;
 
-        if (!rt->rt6i_peer)
-                rt6_bind_peer(rt, 1);
-
-        peer = rt->rt6i_peer;
+        peer = rt6_get_peer_create(rt);
         if (peer) {
                 u32 *old_p = __DST_METRICS_PTR(old);
                 unsigned long prev, new;
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 1a9cdd09f11c..218433cb9928 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1744,9 +1744,7 @@ static struct inet_peer *tcp_v6_get_peer(struct sock *sk, bool *release_it)
                 peer = inet_getpeer_v6(net, &np->daddr, 1);
                 *release_it = true;
         } else {
-                if (!rt->rt6i_peer)
-                        rt6_bind_peer(rt, 1);
-                peer = rt->rt6i_peer;
+                peer = rt6_get_peer_create(rt);
                 *release_it = false;
         }