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icmp: ICMPV6: pass RFC 8335 reply messages to ping_rcv

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The current icmp_rcv function drops all unknown ICMP types, including
ICMP_EXT_ECHOREPLY (type 43). In order to parse Extended Echo Reply messages, we have
to pass these packets to the ping_rcv function, which does not do any
other filtering and passes the packet to the designated socket.

Pass incoming RFC 8335 ICMP Extended Echo Reply packets to the ping_rcv
handler instead of discarding the packet.

Signed-off-by: Andreas Roeseler <andreas.a.roeseler@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andreas Roeseler 2021-04-12 16:23:56 -05:00 • committed by David S. Miller
parent affb05d910
commit 314332023b
2 changed files with 9 additions and 0 deletions
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5
net/ipv4/icmp.c
View file

@ -1196,6 +1196,11 @@ int icmp_rcv(struct sk_buff *skb)
goto success_check;
}
if (icmph->type == ICMP_EXT_ECHOREPLY) {
success = ping_rcv(skb);
goto success_check;
}
/*
* 18 is the highest 'known' ICMP type. Anything else is a mystery
*

4
net/ipv6/icmp.c
View file

@ -916,6 +916,10 @@ static int icmpv6_rcv(struct sk_buff *skb)
success = ping_rcv(skb);
break;
case ICMPV6_EXT_ECHO_REPLY:
success = ping_rcv(skb);
break;
case ICMPV6_PKT_TOOBIG:
/* BUGGG_FUTURE: if packet contains rthdr, we cannot update
standard destination cache. Seems, only "advanced"