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ipv6: icmp6: add SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST

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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@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2023-02-16 16:28:41 +00:00 committed by David S. Miller
parent 784d4477f0
commit c34b8bb11e
2 changed files with 8 additions and 1 deletions
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5
include/net/dropreason.h
View file

@ -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'

4
net/ipv6/ndisc.c
View file

@ -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)