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Message-ID: <20230216162842.1633734-8-edumazet@google.com>
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
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