inet: Minimize use of cached route inetpeer.

Only use it in the absolutely required cases:

1) COW'ing metrics

2) ipv4 PMTU

3) ipv4 redirects

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

1 files changed, 6 insertions, 2 deletions

diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 69a6330dea91..0fddd571400d 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1486,6 +1486,7 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
         int rd_len;
         int err;
         u8 ha_buf[MAX_ADDR_LEN], *ha = NULL;
+        bool ret;
 
         if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) {
                 ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n",
@@ -1519,8 +1520,11 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
                           "Redirect: destination is not a neighbour\n");
                 goto release;
         }
-        peer = rt6_get_peer_create(rt);
-        if (!inet_peer_xrlim_allow(peer, 1*HZ))
+        peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1);
+        ret = inet_peer_xrlim_allow(peer, 1*HZ);
+        if (peer)
+                inet_putpeer(peer);
+        if (!ret)
                 goto release;
 
         if (dev->addr_len) {