From d29245692a44d71d5e2e0770463184a693696232 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Wed, 27 May 2020 17:34:58 -0700 Subject: tcp: ipv6: support RFC 6069 (TCP-LD) 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 Acked-by: Yuchung Cheng Acked-by: Neal Cardwell Signed-off-by: David S. Miller --- net/ipv6/tcp_ipv6.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'net/ipv6/tcp_ipv6.c') diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 01a6f5111a77..b7415ca75c2d 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -473,6 +473,15 @@ static int tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, } else sk->sk_err_soft = err; goto out; + case TCP_LISTEN: + break; + default: + /* check if this ICMP message allows revert of backoff. + * (see RFC 6069) + */ + if (!fastopen && type == ICMPV6_DEST_UNREACH && + code == ICMPV6_NOROUTE) + tcp_ld_RTO_revert(sk, seq); } if (!sock_owned_by_user(sk) && np->recverr) { -- cgit v1.2.3