netdev - Not getting ICMP reports from the UDP socket in rxrpc

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Date:   Fri, 26 Aug 2022 14:10:43 +0100
From:   David Howells <dhowells@...hat.com>
To:     Eric Dumazet <edumazet@...gle.com>
cc:     dhowells@...hat.com, David Miller <davem@...emloft.net>,
        netdev@...r.kernel.org
Subject: Not getting ICMP reports from the UDP socket in rxrpc

Hi Eric,

Do you know if ICMP handling has changed inside of ipv4/ipv6?  I've realised
that though rxrpc tries to get ICMP events, they're not coming through.

rxrpc_open_socket() does:

	usk->sk_error_report = rxrpc_error_report;

to set the error collector and:

		ip6_sock_set_recverr(usk);
		ip_sock_set_recverr(usk);

as appropriate to say that it wants to get ICMP messages, but they don't seem
to come.  I put a printk() into sk_error_report(), but I don't see anything
printed when ICMP messages come in (but I do if I telnet to a random port on
my test server).

Thanks,
David