netdev - [PATCH net-next 7/8] ipv6: icmp6: add SKB_DROP_REASON_IPV6_NDISC_NS

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Date:   Thu, 16 Feb 2023 16:28:41 +0000
From:   Eric Dumazet <edumazet@...gle.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org,
        eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 7/8] ipv6: icmp6: add SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST

Hosts can often receive neighbour discovery messages
that are not for them.

Use a dedicated drop reason to make clear the packet is dropped
for this normal case.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/net/dropreason.h | 5 +++++
 net/ipv6/ndisc.c         | 4 +++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/net/dropreason.h b/include/net/dropreason.h
index 239a5c0ea83eb6053df55f1ea113f3005ec050b0..c0a3ea806cd5bf3045efd568cafb227dab7f2d3d 100644
--- a/include/net/dropreason.h
+++ b/include/net/dropreason.h
@@ -77,6 +77,7 @@
 	FN(IPV6_NDISC_HOP_LIMIT)	\
 	FN(IPV6_NDISC_BAD_CODE)		\
 	FN(IPV6_NDISC_BAD_OPTIONS)	\
+	FN(IPV6_NDISC_NS_OTHERHOST)	\
 	FNe(MAX)
 
 /**
@@ -333,6 +334,10 @@ enum skb_drop_reason {
 	SKB_DROP_REASON_IPV6_NDISC_BAD_CODE,
 	/** @SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS: invalid NDISC options. */
 	SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS,
+	/** @SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST: NEIGHBOUR SOLICITATION
+	 * for another host.
+	 */
+	SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST,
 	/**
 	 * @SKB_DROP_REASON_MAX: the maximum of drop reason, which shouldn't be
 	 * used as a real 'reason'
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index b47e845d66eb8533e2334915fe6f05bed6f84764..c4be62c99f7371a55e56f4489f822d9c11b007f5 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -921,8 +921,10 @@ static enum skb_drop_reason ndisc_recv_ns(struct sk_buff *skb)
 					pneigh_enqueue(&nd_tbl, idev->nd_parms, n);
 				goto out;
 			}
-		} else
+		} else {
+			SKB_DR_SET(reason, IPV6_NDISC_NS_OTHERHOST);
 			goto out;
+		}
 	}
 
 	if (is_router < 0)
-- 
2.39.1.581.gbfd45094c4-goog