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mptcp: increase default max additional subflows to 2 

The current default does not allowing additional subflows, mostly
as a safety restriction to avoid uncontrolled resource consumption
on busy servers.

Still the system admin and/or the application have to opt-in to
MPTCP explicitly. After that, they need to change (increase) the
default maximum number of additional subflows.

Let set that to reasonable default, and make end-users life easier.

Additionally we need to update some self-tests accordingly.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2021-10-15 16:05:51 -07:00 committed by David S. Miller
parent 29211e7db2
commit 72bcbc46a5
3 changed files with 10 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
net/mptcp/pm_netlink.c
View File

@ -2052,6 +2052,9 @@ static int __net_init pm_nl_init_net(struct net *net)
struct pm_nl_pernet *pernet = net_generic(net, pm_nl_pernet_id);
INIT_LIST_HEAD_RCU(&pernet->local_addr_list);
/* Cit. 2 subflows ought to be enough for anybody. */
pernet->subflows_max = 2;
pernet->next_id = 1;
pernet->stale_loss_cnt = 4;
spin_lock_init(&pernet->lock);

5
tools/testing/selftests/net/mptcp/mptcp_join.sh
View File

@ -945,12 +945,15 @@ subflows_tests()
# subflow limited by client
reset
ip netns exec $ns1 ./pm_nl_ctl limits 0 0
ip netns exec $ns2 ./pm_nl_ctl limits 0 0
ip netns exec $ns2 ./pm_nl_ctl add 10.0.3.2 flags subflow
run_tests $ns1 $ns2 10.0.1.1
chk_join_nr "single subflow, limited by client" 0 0 0
# subflow limited by server
reset
ip netns exec $ns1 ./pm_nl_ctl limits 0 0
ip netns exec $ns2 ./pm_nl_ctl limits 0 1
ip netns exec $ns2 ./pm_nl_ctl add 10.0.3.2 flags subflow
run_tests $ns1 $ns2 10.0.1.1
@ -973,7 +976,7 @@ subflows_tests()
run_tests $ns1 $ns2 10.0.1.1
chk_join_nr "multiple subflows" 2 2 2
# multiple subflows limited by serverf
# multiple subflows limited by server
reset
ip netns exec $ns1 ./pm_nl_ctl limits 0 1
ip netns exec $ns2 ./pm_nl_ctl limits 0 2

6
tools/testing/selftests/net/mptcp/pm_netlink.sh
View File

@ -70,7 +70,7 @@ check()
check "ip netns exec $ns1 ./pm_nl_ctl dump" "" "defaults addr list"
check "ip netns exec $ns1 ./pm_nl_ctl limits" "accept 0
subflows 0" "defaults limits"
subflows 2" "defaults limits"
ip netns exec $ns1 ./pm_nl_ctl add 10.0.1.1
ip netns exec $ns1 ./pm_nl_ctl add 10.0.1.2 flags subflow dev lo
@ -118,11 +118,11 @@ check "ip netns exec $ns1 ./pm_nl_ctl dump" "" "flush addrs"
ip netns exec $ns1 ./pm_nl_ctl limits 9 1
check "ip netns exec $ns1 ./pm_nl_ctl limits" "accept 0
subflows 0" "rcv addrs above hard limit"
subflows 2" "rcv addrs above hard limit"
ip netns exec $ns1 ./pm_nl_ctl limits 1 9
check "ip netns exec $ns1 ./pm_nl_ctl limits" "accept 0
subflows 0" "subflows above hard limit"
subflows 2" "subflows above hard limit"
ip netns exec $ns1 ./pm_nl_ctl limits 8 8
check "ip netns exec $ns1 ./pm_nl_ctl limits" "accept 8