ipv6: tcp: enable flowlabel reflection in some RST packets
When RST packets are sent because no socket could be found,
it makes sense to use flowlabel_reflect sysctl to decide
if a reflection of the flowlabel is requested.
This extends commit 22b6722bfa59 ("ipv6: Add sysctl for per
namespace flow label reflection"), for some TCP RST packets.
In order to provide full control of this new feature,
flowlabel_reflect becomes a bitmask.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index a73b3a0..f4b1043 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -1429,14 +1429,24 @@
FALSE: disabled
Default: true
-flowlabel_reflect - BOOLEAN
- Automatically reflect the flow label. Needed for Path MTU
+flowlabel_reflect - INTEGER
+ Control flow label reflection. Needed for Path MTU
Discovery to work with Equal Cost Multipath Routing in anycast
environments. See RFC 7690 and:
https://tools.ietf.org/html/draft-wang-6man-flow-label-reflection-01
- TRUE: enabled
- FALSE: disabled
- Default: FALSE
+
+ This is a mask of two bits.
+ 1: enabled for established flows
+
+ Note that this prevents automatic flowlabel changes, as done
+ in "tcp: change IPv6 flow-label upon receiving spurious retransmission"
+ and "tcp: Change txhash on every SYN and RTO retransmit"
+
+ 2: enabled for TCP RESET packets (no active listener)
+ If set, a RST packet sent in response to a SYN packet on a closed
+ port will reflect the incoming flow label.
+
+ Default: 0
fib_multipath_hash_policy - INTEGER
Controls which hash policy to use for multipath routes.
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index cc6f8d0..ceab2fe2 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -212,7 +212,7 @@ static int inet6_create(struct net *net, struct socket *sock, int protocol,
np->mc_loop = 1;
np->mc_all = 1;
np->pmtudisc = IPV6_PMTUDISC_WANT;
- np->repflow = net->ipv6.sysctl.flowlabel_reflect;
+ np->repflow = net->ipv6.sysctl.flowlabel_reflect & 1;
sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
/* Init the ipv4 part of the socket since we can have sockets
diff --git a/net/ipv6/sysctl_net_ipv6.c b/net/ipv6/sysctl_net_ipv6.c
index e15cd37..6d86fac 100644
--- a/net/ipv6/sysctl_net_ipv6.c
+++ b/net/ipv6/sysctl_net_ipv6.c
@@ -23,6 +23,7 @@
static int zero;
static int one = 1;
+static int three = 3;
static int auto_flowlabels_min;
static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
@@ -114,6 +115,8 @@ static struct ctl_table ipv6_table_template[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
+ .extra1 = &zero,
+ .extra2 = &three,
},
{
.procname = "max_dst_opts_number",
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index beaf284..4ccb06e 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -916,15 +916,17 @@ static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32
static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
{
const struct tcphdr *th = tcp_hdr(skb);
+ struct ipv6hdr *ipv6h = ipv6_hdr(skb);
u32 seq = 0, ack_seq = 0;
struct tcp_md5sig_key *key = NULL;
#ifdef CONFIG_TCP_MD5SIG
const __u8 *hash_location = NULL;
- struct ipv6hdr *ipv6h = ipv6_hdr(skb);
unsigned char newhash[16];
int genhash;
struct sock *sk1 = NULL;
#endif
+ __be32 label = 0;
+ struct net *net;
int oif = 0;
if (th->rst)
@@ -936,6 +938,7 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
if (!sk && !ipv6_unicast_destination(skb))
return;
+ net = dev_net(skb_dst(skb)->dev);
#ifdef CONFIG_TCP_MD5SIG
rcu_read_lock();
hash_location = tcp_parse_md5sig_option(th);
@@ -949,7 +952,7 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
* Incoming packet is checked with md5 hash with finding key,
* no RST generated if md5 hash doesn't match.
*/
- sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev),
+ sk1 = inet6_lookup_listener(net,
&tcp_hashinfo, NULL, 0,
&ipv6h->saddr,
th->source, &ipv6h->daddr,
@@ -979,9 +982,13 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
oif = sk->sk_bound_dev_if;
if (sk_fullsock(sk))
trace_tcp_send_reset(sk, skb);
+ } else {
+ if (net->ipv6.sysctl.flowlabel_reflect & 2)
+ label = ip6_flowlabel(ipv6h);
}
- tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0);
+ tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0,
+ label);
#ifdef CONFIG_TCP_MD5SIG
out:
