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authorEric Dumazet <edumazet@google.com>2020-05-27 17:34:58 -0700
committerDavid S. Miller <davem@davemloft.net>2020-05-28 11:02:46 -0700
commitd29245692a44d71d5e2e0770463184a693696232 (patch)
treeefe215dec4d12a186e173b33011b3af319c3fb66 /net/ipv6
parent4d7525085a9ba86b9d78561d379b2ff8c0b30468 (diff)
downloadlinux-d29245692a44d71d5e2e0770463184a693696232.tar.bz2
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 <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>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/tcp_ipv6.c9
1 files changed, 9 insertions, 0 deletions
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) {