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ipv6: icmp: allow flowlabel reflection in echo replies 

Extend flowlabel_reflect bitmask to allow conditional
reflection of incoming flowlabels in echo replies.

Note this has precedence against auto flowlabels.

Add flowlabel_reflect enum to replace hard coded
values.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2019-07-01 06:39:36 -07:00 committed by David S. Miller
parent 954a5a0294
commit a346abe051
6 changed files with 17 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/networking/ip-sysctl.txt
View File

@ -1452,7 +1452,7 @@ flowlabel_reflect - INTEGER
environments. See RFC 7690 and:
https://tools.ietf.org/html/draft-wang-6man-flow-label-reflection-01
This is a mask of two bits.
This is a bitmask.
1: enabled for established flows
Note that this prevents automatic flowlabel changes, as done
@ -1463,6 +1463,8 @@ flowlabel_reflect - INTEGER
If set, a RST packet sent in response to a SYN packet on a closed
port will reflect the incoming flow label.
4: enabled for ICMPv6 echo reply messages.
Default: 0
fib_multipath_hash_policy - INTEGER

7
include/net/ipv6.h
View File

@ -301,6 +301,13 @@ struct ipv6_txoptions {
/* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
};
/* flowlabel_reflect sysctl values */
enum flowlabel_reflect {
FLOWLABEL_REFLECT_ESTABLISHED = 1,
FLOWLABEL_REFLECT_TCP_RESET = 2,
FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES = 4,
};
struct ip6_flowlabel {
struct ip6_flowlabel __rcu *next;
__be32 label;

2
net/ipv6/af_inet6.c
View File

@ -208,7 +208,7 @@ lookup_protocol:
np->mc_loop = 1;
np->mc_all = 1;
np->pmtudisc = IPV6_PMTUDISC_WANT;
np->repflow = net->ipv6.sysctl.flowlabel_reflect & 1;
np->repflow = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED;
sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
/* Init the ipv4 part of the socket since we can have sockets

3
net/ipv6/icmp.c
View File

@ -703,6 +703,9 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY;
memset(&fl6, 0, sizeof(fl6));
if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES)
fl6.flowlabel = ip6_flowlabel(ipv6_hdr(skb));
fl6.flowi6_proto = IPPROTO_ICMPV6;
fl6.daddr = ipv6_hdr(skb)->saddr;
if (saddr)

4
net/ipv6/sysctl_net_ipv6.c
View File

@ -23,7 +23,7 @@
static int zero;
static int one = 1;
static int three = 3;
static int flowlabel_reflect_max = 0x7;
static int auto_flowlabels_min;
static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
@ -116,7 +116,7 @@ static struct ctl_table ipv6_table_template[] = {
.mode = 0644,
.proc_handler = proc_dointvec,
.extra1 = &zero,
.extra2 = &three,
.extra2 = &flowlabel_reflect_max,
},
{
.procname = "max_dst_opts_number",

2
net/ipv6/tcp_ipv6.c
View File

@ -989,7 +989,7 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
if (sk->sk_state == TCP_TIME_WAIT)
label = cpu_to_be32(inet_twsk(sk)->tw_flowlabel);
} else {
if (net->ipv6.sysctl.flowlabel_reflect & 2)
if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_TCP_RESET)
label = ip6_flowlabel(ipv6h);
}