From a11d206d0f88e092419877c7f706cafb5e1c2e57 Mon Sep 17 00:00:00 2001
From: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Date: Sat, 4 Nov 2006 20:11:37 +0900
Subject: [IPV6]: Per-interface statistics support.

For IP MIB (RFC4293).

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
---
 net/ipv6/ip6_input.c | 40 +++++++++++++++++++++++++++-------------
 1 file changed, 27 insertions(+), 13 deletions(-)

(limited to 'net/ipv6/ip6_input.c')

diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index ebf54ae90a0..ad0b8abcdf4 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -60,14 +60,22 @@ int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt
 {
 	struct ipv6hdr *hdr;
 	u32 		pkt_len;
+	struct inet6_dev *idev;
 
-	if (skb->pkt_type == PACKET_OTHERHOST)
-		goto drop;
+	if (skb->pkt_type == PACKET_OTHERHOST) {
+		kfree_skb(skb);
+		return 0;
+	}
+
+	rcu_read_lock();
 
-	IP6_INC_STATS_BH(IPSTATS_MIB_INRECEIVES);
+	idev = __in6_dev_get(skb->dev);
+
+	IP6_INC_STATS_BH(idev, IPSTATS_MIB_INRECEIVES);
 
 	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
-		IP6_INC_STATS_BH(IPSTATS_MIB_INDISCARDS);
+		IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDISCARDS);
+		rcu_read_unlock();
 		goto out;
 	}
 
@@ -104,7 +112,7 @@ int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt
 		if (pkt_len + sizeof(struct ipv6hdr) > skb->len)
 			goto truncated;
 		if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) {
-			IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS);
+			IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS);
 			goto drop;
 		}
 		hdr = skb->nh.ipv6h;
@@ -112,17 +120,21 @@ int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt
 
 	if (hdr->nexthdr == NEXTHDR_HOP) {
 		if (ipv6_parse_hopopts(&skb) < 0) {
-			IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS);
+			IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS);
+			rcu_read_unlock();
 			return 0;
 		}
 	}
 
+	rcu_read_unlock();
+
 	return NF_HOOK(PF_INET6,NF_IP6_PRE_ROUTING, skb, dev, NULL, ip6_rcv_finish);
 truncated:
-	IP6_INC_STATS_BH(IPSTATS_MIB_INTRUNCATEDPKTS);
+	IP6_INC_STATS_BH(idev, IPSTATS_MIB_INTRUNCATEDPKTS);
 err:
-	IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS);
+	IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS);
 drop:
+	rcu_read_unlock();
 	kfree_skb(skb);
 out:
 	return 0;
@@ -140,6 +152,7 @@ static inline int ip6_input_finish(struct sk_buff *skb)
 	unsigned int nhoff;
 	int nexthdr;
 	u8 hash;
+	struct inet6_dev *idev;
 
 	/*
 	 *	Parse extension headers
@@ -147,6 +160,7 @@ static inline int ip6_input_finish(struct sk_buff *skb)
 
 	rcu_read_lock();
 resubmit:
+	idev = ip6_dst_idev(skb->dst);
 	if (!pskb_pull(skb, skb->h.raw - skb->data))
 		goto discard;
 	nhoff = IP6CB(skb)->nhoff;
@@ -185,24 +199,24 @@ resubmit:
 		if (ret > 0)
 			goto resubmit;
 		else if (ret == 0)
-			IP6_INC_STATS_BH(IPSTATS_MIB_INDELIVERS);
+			IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDELIVERS);
 	} else {
 		if (!raw_sk) {
 			if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
-				IP6_INC_STATS_BH(IPSTATS_MIB_INUNKNOWNPROTOS);
+				IP6_INC_STATS_BH(idev, IPSTATS_MIB_INUNKNOWNPROTOS);
 				icmpv6_send(skb, ICMPV6_PARAMPROB,
 				            ICMPV6_UNK_NEXTHDR, nhoff,
 				            skb->dev);
 			}
 		} else
-			IP6_INC_STATS_BH(IPSTATS_MIB_INDELIVERS);
+			IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDELIVERS);
 		kfree_skb(skb);
 	}
 	rcu_read_unlock();
 	return 0;
 
 discard:
-	IP6_INC_STATS_BH(IPSTATS_MIB_INDISCARDS);
+	IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDISCARDS);
 	rcu_read_unlock();
 	kfree_skb(skb);
 	return 0;
@@ -219,7 +233,7 @@ int ip6_mc_input(struct sk_buff *skb)
 	struct ipv6hdr *hdr;
 	int deliver;
 
-	IP6_INC_STATS_BH(IPSTATS_MIB_INMCASTPKTS);
+	IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_INMCASTPKTS);
 
 	hdr = skb->nh.ipv6h;
 	deliver = likely(!(skb->dev->flags & (IFF_PROMISC|IFF_ALLMULTI))) ||
-- 
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