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tcp: ipv6: support RFC 6069 (TCP-LD)

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Make tcp_ld_RTO_revert() helper available to IPv6, and
implement RFC 6069 :

Quoting this RFC :

3. Connectivity Disruption Indication

   For Internet Protocol version 6 (IPv6) [RFC2460], the counterpart of
   the ICMP destination unreachable message of code 0 (net unreachable)
   and of code 1 (host unreachable) is the ICMPv6 destination
   unreachable message of code 0 (no route to destination) [RFC4443].
   As with IPv4, a router should generate an ICMPv6 destination
   unreachable message of code 0 in response to a packet that cannot be
   delivered to its destination address because it lacks a matching
   entry in its routing table.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2020-05-27 17:34:58 -07:00 • committed by David S. Miller
parent 4d7525085a
commit d29245692a
3 changed files with 12 additions and 1 deletions
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3
net/ipv4/tcp_ipv4.c
View file

@ -404,7 +404,7 @@ void tcp_req_err(struct sock *sk, u32 seq, bool abort)
EXPORT_SYMBOL(tcp_req_err);
/* TCP-LD (RFC 6069) logic */
static void tcp_ld_RTO_revert(struct sock *sk, u32 seq)
void tcp_ld_RTO_revert(struct sock *sk, u32 seq)
{
struct inet_connection_sock *icsk = inet_csk(sk);
struct tcp_sock *tp = tcp_sk(sk);
@ -441,6 +441,7 @@ static void tcp_ld_RTO_revert(struct sock *sk, u32 seq)
tcp_retransmit_timer(sk);
}
}
EXPORT_SYMBOL(tcp_ld_RTO_revert);
/*
* This routine is called by the ICMP module when it gets some