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ipv4: icmp: do not process ICMP_EXT_ECHOREPLY for broadcast/multicast addresses

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There is no point processing ICMP_EXT_ECHOREPLY for routes
which would drop ICMP_ECHOREPLY (RFC 1122 3.2.2.6, 3.2.2.8)

This seems an oversight of the initial implementation.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20250226183437.1457318-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2025-02-26 18:34:36 +00:00 committed by Jakub Kicinski
parent 8e7e3d97f9
commit daeb6a8f3b
1 changed files with 16 additions and 16 deletions
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32
net/ipv4/icmp.c
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@ -1248,22 +1248,6 @@ int icmp_rcv(struct sk_buff *skb)
goto reason_check;
}
if (icmph->type == ICMP_EXT_ECHOREPLY) {
reason = ping_rcv(skb);
goto reason_check;
}
/*
* 18 is the highest 'known' ICMP type. Anything else is a mystery
*
* RFC 1122: 3.2.2 Unknown ICMP messages types MUST be silently
* discarded.
*/
if (icmph->type > NR_ICMP_TYPES) {
reason = SKB_DROP_REASON_UNHANDLED_PROTO;
goto error;
}
/*
* Parse the ICMP message
*/
@ -1290,6 +1274,22 @@ int icmp_rcv(struct sk_buff *skb)
}
}
if (icmph->type == ICMP_EXT_ECHOREPLY) {
reason = ping_rcv(skb);
goto reason_check;
}
/*
* 18 is the highest 'known' ICMP type. Anything else is a mystery
*
* RFC 1122: 3.2.2 Unknown ICMP messages types MUST be silently
* discarded.
*/
if (icmph->type > NR_ICMP_TYPES) {
reason = SKB_DROP_REASON_UNHANDLED_PROTO;
goto error;
}
reason = icmp_pointers[icmph->type].handler(skb);
reason_check:
if (!reason) {