[IPV6] SNMP: Fix {In,Out}NoRoutes statistics.

A packet which is being discarded because of no routes in the
forwarding path should not be counted as OutNoRoutes but as
InNoRoutes.
Additionally, on this occasion, a packet whose destinaion is
not valid should be counted as InAddrErrors separately.

Based on patch from Mitsuru Chinen <mitch@linux.vnet.ibm.com>.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index ad9b285692ba72f8f44a76174ee9725bc5e08e15..aebb4e2d5ae30e055df38924e2e835a14e623080 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1766,13 +1766,22 @@ int ipv6_route_ioctl(unsigned int cmd, void __user *arg)
  *     Drop the packet on the floor
  */
 
-static inline int ip6_pkt_drop(struct sk_buff *skb, int code)
-{
-       int type = ipv6_addr_type(&skb->nh.ipv6h->daddr);
-       if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED)
-               IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS);
-
-       IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_OUTNOROUTES);
+static inline int ip6_pkt_drop(struct sk_buff *skb, int code,
+                              int ipstats_mib_noroutes)
+{
+       int type;
+       switch (ipstats_mib_noroutes) {
+       case IPSTATS_MIB_INNOROUTES:
+               type = ipv6_addr_type(&skb->nh.ipv6h->daddr);
+               if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) {
+                       IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS);
+                       break;
+               }
+               /* FALLTHROUGH */
+       case IPSTATS_MIB_OUTNOROUTES:
+               IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes);
+               break;
+       }
        icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev);
        kfree_skb(skb);
        return 0;
@@ -1780,26 +1789,26 @@ static inline int ip6_pkt_drop(struct sk_buff *skb, int code)
 
 static int ip6_pkt_discard(struct sk_buff *skb)
 {
-       return ip6_pkt_drop(skb, ICMPV6_NOROUTE);
+       return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
 }
 
 static int ip6_pkt_discard_out(struct sk_buff *skb)
 {
        skb->dev = skb->dst->dev;
-       return ip6_pkt_discard(skb);
+       return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
 }
 
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 
 static int ip6_pkt_prohibit(struct sk_buff *skb)
 {
-       return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED);
+       return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
 }
 
 static int ip6_pkt_prohibit_out(struct sk_buff *skb)
 {
        skb->dev = skb->dst->dev;
-       return ip6_pkt_prohibit(skb);
+       return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
 }
 
 static int ip6_pkt_blk_hole(struct sk_buff *skb)