lib/config, lib/connections: Add optional connection limits (fixes #7176) (#7223)

This adds two new configuration options:

    // The number of connections at which we stop trying to connect to more
    // devices, zero meaning no limit. Does not affect incoming connections.
    ConnectionLimitEnough int

    // The maximum number of connections which we will allow in total, zero
    // meaning no limit. Affects incoming connections and prevents
    // attempting outgoing connections.
    ConnectionLimitMax int

These can be used to limit the number of concurrent connections in
various ways.

go.mod

@@ -17,7 +17,6 @@ require (
 	github.com/gobwas/glob v0.2.3
 	github.com/gogo/protobuf v1.3.1
 	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e
-	github.com/golang/protobuf v1.4.3
 	github.com/greatroar/blobloom v0.5.0
 	github.com/jackpal/gateway v1.0.6
 	github.com/jackpal/go-nat-pmp v1.0.2
@@ -46,6 +45,7 @@ require (
 	golang.org/x/sys v0.0.0-20201101102859-da207088b7d1
 	golang.org/x/text v0.3.4
 	golang.org/x/time v0.0.0-20200630173020-3af7569d3a1e
+	google.golang.org/protobuf v1.23.0
 )
 
 go 1.14

lib/api/mocked_model_test.go

@@ -49,11 +49,15 @@ func (m *mockedModel) FolderProgressBytesCompleted(_ string) int64 {
 	return 0
 }
 
+func (m *mockedModel) NumConnections() int {
+	return 0
+}
+
 func (m *mockedModel) ConnectionStats() map[string]interface{} {
 	return nil
 }
 
-func (m *mockedModel) DeviceStatistics() (map[string]stats.DeviceStatistics, error) {
+func (m *mockedModel) DeviceStatistics() (map[protocol.DeviceID]stats.DeviceStatistics, error) {
 	return nil, nil
 }
 

lib/config/observed.pb.go

@@ -7,9 +7,9 @@ import (
 	fmt "fmt"
 	proto "github.com/gogo/protobuf/proto"
 	github_com_gogo_protobuf_types "github.com/gogo/protobuf/types"
-	_ "github.com/golang/protobuf/ptypes/timestamp"
 	github_com_syncthing_syncthing_lib_protocol "github.com/syncthing/syncthing/lib/protocol"
 	_ "github.com/syncthing/syncthing/proto/ext"
+	_ "google.golang.org/protobuf/types/known/timestamppb"
 	io "io"
 	math "math"
 	math_bits "math/bits"

lib/config/optionsconfiguration.go

@@ -47,6 +47,14 @@ func (opts *OptionsConfiguration) prepare(guiPWIsSet bool) {
 			}
 		}
 	}
+
+	// Negative limits are meaningless, zero means unlimited.
+	if opts.ConnectionLimitEnough < 0 {
+		opts.ConnectionLimitEnough = 0
+	}
+	if opts.ConnectionLimitMax < 0 {
+		opts.ConnectionLimitMax = 0
+	}
 }
 
 // RequiresRestartOnly returns a copy with only the attributes that require
@@ -178,3 +186,17 @@ func (opts OptionsConfiguration) FeatureFlag(name string) bool {
 
 	return false
 }
+
+// LowestConnectionLimit is the lower of ConnectionLimitEnough or
+// ConnectionLimitMax, or whichever of them is actually set if only one of
+// them is set. It's the point where we should stop dialling.
+func (opts OptionsConfiguration) LowestConnectionLimit() int {
+	limit := opts.ConnectionLimitEnough
+	if limit == 0 || (opts.ConnectionLimitMax != 0 && opts.ConnectionLimitMax < limit) {
+		// It doesn't really make sense to set Max lower than Enough but
+		// someone might do it while experimenting and it's easy for us to
+		// do the right thing.
+		limit = opts.ConnectionLimitMax
+	}
+	return limit
+}

lib/config/optionsconfiguration.pb.go

@@ -74,6 +74,13 @@ type OptionsConfiguration struct {
 	AnnounceLANAddresses    bool     `protobuf:"varint,48,opt,name=announce_lan_addresses,json=announceLanAddresses,proto3" json:"announceLANAddresses" xml:"announceLANAddresses" default:"true"`
 	SendFullIndexOnUpgrade  bool     `protobuf:"varint,49,opt,name=send_full_index_on_upgrade,json=sendFullIndexOnUpgrade,proto3" json:"sendFullIndexOnUpgrade" xml:"sendFullIndexOnUpgrade"`
 	FeatureFlags            []string `protobuf:"bytes,50,rep,name=feature_flags,json=featureFlags,proto3" json:"featureFlags" xml:"featureFlag"`
+	// The number of connections at which we stop trying to connect to more
+	// devices, zero meaning no limit. Does not affect incoming connections.
+	ConnectionLimitEnough int `protobuf:"varint,51,opt,name=connection_limit_enough,json=connectionLimitEnough,proto3,casttype=int" json:"connectionLimitEnough" xml:"connectionLimitEnough"`
+	// The maximum number of connections which we will allow in total, zero
+	// meaning no limit. Affects incoming connections and prevents
+	// attempting outgoing connections.
+	ConnectionLimitMax int `protobuf:"varint,52,opt,name=connection_limit_max,json=connectionLimitMax,proto3,casttype=int" json:"connectionLimitMax" xml:"connectionLimitMax"`
 	// Legacy deprecated
 	DeprecatedUPnPEnabled        bool     `protobuf:"varint,9000,opt,name=upnp_enabled,json=upnpEnabled,proto3" json:"-" xml:"upnpEnabled,omitempty"`                                    // Deprecated: Do not use.
 	DeprecatedUPnPLeaseM         int      `protobuf:"varint,9001,opt,name=upnp_lease_m,json=upnpLeaseM,proto3,casttype=int" json:"-" xml:"upnpLeaseMinutes,omitempty"`                   // Deprecated: Do not use.
@@ -126,204 +133,208 @@ func init() {
 }
 
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+	0xe3, 0xc7, 0xce, 0xef, 0x79, 0xca, 0x93, 0x2c, 0xda, 0xe8, 0xf0, 0x39, 0xe5, 0x65, 0x9f, 0xdd,
+	0xd0, 0x98, 0x4b, 0x2a, 0x8e, 0x44, 0x26, 0x39, 0x88, 0xe2, 0x1d, 0xe0, 0x17, 0xce, 0x94, 0x26,
+	0x61, 0xf8, 0xca, 0xe7, 0x7d, 0x97, 0x42, 0xec, 0xce, 0x99, 0xcd, 0x7f, 0x1e, 0xee, 0x55, 0xc7,
+	0x1f, 0xd5, 0x14, 0xe4, 0x47, 0x02, 0x5f, 0x94, 0xd9, 0xf1, 0x1c, 0xed, 0x0d, 0x75, 0x00, 0x3b,
+	0x6d, 0xa8, 0xbe, 0xa2, 0xdb, 0x04, 0x4a, 0x98, 0xaf, 0x3f, 0xcd, 0x2f, 0xf1, 0xa0, 0xe8, 0x3d,
+	0x13, 0x81, 0xbc, 0x2a, 0xbf, 0x4b, 0x18, 0x2c, 0xfc, 0xa1, 0x28, 0xc2, 0xe4, 0xe4, 0x15, 0x54,
+	0x54, 0xd4, 0xfe, 0xad, 0xa8, 0xe3, 0xee, 0x16, 0xf1, 0xda, 0x9e, 0xcd, 0x20, 0x70, 0x34, 0x5d,
+	0x46, 0xcc, 0x3a, 0xd9, 0xb2, 0x2d, 0x62, 0x52, 0xdc, 0x24, 0x3e, 0x84, 0xd3, 0xb8, 0x10, 0xd2,
+	0x2b, 0xd9, 0xf5, 0xd2, 0xc8, 0xbd, 0xa4, 0x11, 0xe2, 0x6d, 0xe6, 0xc8, 0xd6, 0x5d, 0x50, 0xef,
+	0x84, 0xc6, 0x25, 0xb7, 0x04, 0xd9, 0x16, 0xe1, 0xe8, 0x3d, 0x3a, 0x1b, 0x99, 0xea, 0x86, 0xc6,
+	0x2b, 0x9c, 0xe0, 0x23, 0xe8, 0xf6, 0x5e, 0x94, 0x50, 0xc5, 0xf5, 0xe0, 0x81, 0x1e, 0x85, 0x85,
+	0xf6, 0x25, 0xf5, 0x1c, 0x84, 0x31, 0xd3, 0xa6, 0x75, 0xb2, 0x6d, 0xc2, 0x4a, 0xae, 0x39, 0xae,
+	0xb5, 0xe9, 0xeb, 0x97, 0xf8, 0x96, 0x86, 0x45, 0xa3, 0x81, 0xc2, 0x02, 0xe0, 0x4b, 0x36, 0x9d,
+	0xe1, 0x68, 0x7a, 0x6b, 0x5b, 0x86, 0xa4, 0x99, 0x72, 0x94, 0xff, 0x22, 0x89, 0x25, 0xed, 0xef,
+	0x90, 0xee, 0x52, 0x6c, 0x6d, 0x92, 0xba, 0x49, 0x5d, 0x66, 0x37, 0x6c, 0x0b, 0x47, 0xf7, 0x0f,
+	0x75, 0x5f, 0xaf, 0xf2, 0xf9, 0x7d, 0x0f, 0x86, 0x7b, 0x78, 0x2d, 0x52, 0xba, 0x2b, 0xe8, 0x2c,
+	0xcc, 0xc1, 0x68, 0x0f, 0x07, 0x52, 0xa4, 0x1b, 0x1a, 0x17, 0xa2, 0xd0, 0x2e, 0x83, 0xf9, 0x5d,
+	0xa5, 0x14, 0xe9, 0xee, 0x55, 0x7b, 0x58, 0xdc, 0xdd, 0xaf, 0xf6, 0x60, 0x81, 0xa4, 0x2d, 0xea,
+	0xbe, 0x86, 0xd4, 0xd3, 0xcc, 0xc3, 0x8d, 0x86, 0x6d, 0x99, 0x96, 0x83, 0x7d, 0x5f, 0xbf, 0xcc,
+	0x87, 0xf5, 0x25, 0xa8, 0x97, 0x63, 0x60, 0x16, 0xe4, 0xdd, 0xd0, 0xd0, 0xa2, 0x01, 0x15, 0x84,
+	0xe9, 0x45, 0x4d, 0x4e, 0x55, 0xbb, 0xaf, 0x0e, 0xc6, 0x43, 0x6c, 0x36, 0x5c, 0xa7, 0x4e, 0x3c,
+	0xb3, 0x85, 0xd9, 0x86, 0xfe, 0x0c, 0xdf, 0xf5, 0xd3, 0x70, 0x0c, 0xc4, 0xf0, 0x3c, 0x47, 0x97,
+	0x31, 0xdb, 0x48, 0x43, 0x4c, 0x09, 0x11, 0xa6, 0xeb, 0x6d, 0x58, 0x56, 0xca, 0xdb, 0xa8, 0xdc,
+	0x5c, 0xdb, 0x54, 0xcf, 0xfa, 0x84, 0x99, 0x8e, 0xdb, 0x36, 0x5b, 0x9e, 0xed, 0x7a, 0x36, 0xdb,
+	0xd1, 0x9f, 0xe5, 0x5b, 0x01, 0xfa, 0xeb, 0xf7, 0x09, 0x5b, 0x74, 0xdb, 0xcb, 0x31, 0x92, 0x76,
+	0x96, 0x17, 0xf7, 0x4c, 0x2c, 0x0a, 0xcd, 0xb5, 0xf7, 0x15, 0x75, 0xb8, 0x89, 0xb7, 0x13, 0xe7,
+	0x2c, 0x97, 0x5a, 0x81, 0xe7, 0x11, 0x6a, 0xed, 0xe8, 0xe3, 0x7c, 0xf4, 0x7c, 0x7e, 0xc5, 0x82,
+	0xdb, 0x4b, 0x78, 0x3b, 0xe2, 0x38, 0x9b, 0xa9, 0xc0, 0x41, 0xdf, 0x94, 0xc8, 0xd3, 0x83, 0x5e,
+	0x06, 0x26, 0x03, 0xcd, 0xef, 0x44, 0xe4, 0x76, 0x91, 0xd4, 0xaa, 0xf6, 0xb1, 0xa2, 0x0e, 0x5a,
+	0x1e, 0xf6, 0x37, 0x0a, 0x99, 0xff, 0x73, 0x7c, 0x32, 0x3e, 0xe0, 0x99, 0xff, 0x6c, 0x92, 0xf9,
+	0x5b, 0x71, 0xe6, 0x3f, 0x1f, 0x9d, 0xc8, 0xd0, 0x2c, 0xcb, 0xc1, 0xa5, 0xc1, 0x97, 0xeb, 0x94,
+	0xb3, 0x79, 0x2e, 0x86, 0x15, 0x3c, 0x50, 0x32, 0x02, 0x35, 0x81, 0x15, 0xd7, 0x04, 0xd5, 0x47,
+	0x31, 0x03, 0x55, 0xc1, 0x6c, 0x54, 0x15, 0x14, 0x8c, 0x79, 0x8e, 0xf6, 0x23, 0x45, 0x1d, 0x29,
+	0xba, 0x97, 0x5c, 0xc6, 0x3c, 0xcf, 0xe7, 0xdf, 0x3e, 0x08, 0x8d, 0x93, 0xb3, 0x48, 0x78, 0x47,
+	0xc8, 0x5b, 0x29, 0xbe, 0x23, 0x48, 0xd1, 0x5e, 0x4b, 0x63, 0x77, 0xbf, 0x9a, 0xd9, 0x46, 0x72,
+	0xcb, 0xda, 0x57, 0x14, 0x75, 0xd8, 0x67, 0x01, 0x35, 0x21, 0x5f, 0xc2, 0x8e, 0xbd, 0x45, 0xcc,
+	0x28, 0x0b, 0xf6, 0xf5, 0x17, 0xd2, 0x2c, 0x74, 0x10, 0x34, 0xee, 0x24, 0x0a, 0x2b, 0x80, 0xaf,
+	0xa4, 0xb9, 0x91, 0x04, 0xcb, 0xa7, 0xf0, 0x42, 0x18, 0x3b, 0x36, 0x79, 0x73, 0x02, 0xc9, 0xac,
+	0x41, 0x65, 0x5c, 0xa0, 0x01, 0xd1, 0xd4, 0xd7, 0x5f, 0xe4, 0x24, 0x5e, 0x87, 0x7d, 0x99, 0x6b,
+	0xb6, 0x64, 0xd3, 0xac, 0x82, 0x28, 0x21, 0x62, 0x66, 0x98, 0x0b, 0xa3, 0x53, 0x13, 0xa8, 0x6c,
+	0x07, 0x72, 0xf1, 0x3e, 0xde, 0x7b, 0xf2, 0xbc, 0xf5, 0x12, 0x8f, 0x9c, 0xf5, 0x83, 0xd0, 0xe8,
+	0x47, 0xb8, 0xbd, 0xc2, 0x02, 0xe1, 0x61, 0xeb, 0x94, 0x9f, 0x7d, 0xa6, 0x57, 0x50, 0x99, 0xec,
+	0xa1, 0x8f, 0x6f, 0x05, 0x8b, 0x48, 0xb4, 0xa7, 0x6d, 0xa9, 0x67, 0xa0, 0xd8, 0xac, 0x61, 0x9f,
+	0x98, 0xd1, 0x4b, 0xa3, 0x7e, 0x65, 0x4c, 0x19, 0xef, 0x9f, 0xea, 0x4f, 0x92, 0xa1, 0x55, 0x2e,
+	0xe5, 0x77, 0x86, 0xfd, 0x89, 0x6a, 0x24, 0xcb, 0xc2, 0x54, 0x4e, 0x5c, 0x19, 0x8b, 0x4b, 0x8f,
+	0x78, 0x79, 0xbc, 0xb3, 0x5f, 0x55, 0x50, 0xa1, 0xa9, 0xf6, 0xed, 0xa3, 0xea, 0x25, 0x88, 0x1a,
+	0x69, 0xb8, 0x80, 0xd2, 0xd5, 0x72, 0x9b, 0xb0, 0x64, 0x3d, 0x72, 0x3f, 0x20, 0x3e, 0x33, 0x37,
+	0xed, 0x9a, 0x7e, 0x95, 0x4f, 0xc7, 0x9f, 0x94, 0xf8, 0x85, 0x72, 0x09, 0x6f, 0xcf, 0x2e, 0xa0,
+	0x08, 0xbf, 0x63, 0xcf, 0x74, 0x42, 0xc3, 0x68, 0xe2, 0xed, 0x74, 0x8b, 0xb3, 0x85, 0xd8, 0x46,
+	0xa6, 0x92, 0x9e, 0x7d, 0x0f, 0xd1, 0x13, 0xca, 0xbe, 0x87, 0x9a, 0x7c, 0xb8, 0x4a, 0xfc, 0xe6,
+	0x59, 0xa0, 0x8b, 0x1e, 0xd2, 0xac, 0xa6, 0x7d, 0xaa, 0xa8, 0xc3, 0xe9, 0xc3, 0x8b, 0x83, 0xc5,
+	0xa7, 0xda, 0x09, 0xbe, 0x81, 0x3f, 0x84, 0x91, 0x18, 0x4a, 0x1e, 0x2e, 0x16, 0xa7, 0xef, 0x8a,
+	0xaf, 0xb5, 0x43, 0x58, 0x22, 0x4f, 0xd3, 0x67, 0x19, 0x28, 0x7b, 0x2f, 0x93, 0x1a, 0xe9, 0x21,
+	0x17, 0xb6, 0xbe, 0x94, 0x14, 0xca, 0x5a, 0x61, 0xe1, 0xa9, 0x77, 0x4b, 0x3d, 0xcf, 0xdf, 0x56,
+	0x1a, 0x81, 0xe3, 0xc4, 0xb9, 0x8c, 0x4b, 0x93, 0xc2, 0x54, 0x9f, 0xe4, 0x9e, 0xde, 0x82, 0x5c,
+	0x01, 0xb4, 0xe6, 0x03, 0xc7, 0xe1, 0x59, 0xc8, 0x3d, 0x1a, 0x97, 0x92, 0xdd, 0xd0, 0xb8, 0x18,
+	0x1f, 0x59, 0x32, 0xb8, 0x82, 0x7a, 0xb4, 0xd3, 0x5e, 0x57, 0x4f, 0x37, 0x08, 0x66, 0x81, 0x47,
+	0xcc, 0x86, 0x83, 0xd7, 0x7d, 0x7d, 0x8a, 0xef, 0xbb, 0xcb, 0x70, 0xbe, 0xc7, 0xc0, 0x3c, 0xc8,
+	0xd3, 0x77, 0x18, 0x41, 0x58, 0x41, 0x39, 0x15, 0xad, 0xad, 0x8e, 0x08, 0xcf, 0x2f, 0x51, 0x65,
+	0x43, 0xa8, 0x1b, 0xac, 0x6f, 0xe8, 0xd7, 0xf8, 0xa2, 0x7d, 0x95, 0x87, 0xd7, 0x54, 0x65, 0x11,
+	0x34, 0x5e, 0xe3, 0x0a, 0x69, 0xae, 0x23, 0x45, 0xd3, 0x3c, 0x42, 0xde, 0x58, 0xdb, 0x54, 0x87,
+	0x4a, 0x1d, 0x37, 0xf1, 0xb6, 0x7e, 0x9d, 0xf7, 0xfa, 0x0a, 0xa4, 0x80, 0x85, 0x86, 0x4b, 0x78,
+	0xbb, 0x1b, 0x1a, 0xba, 0xac, 0xcb, 0x25, 0xbc, 0x9d, 0xf6, 0x27, 0x69, 0xa6, 0x7d, 0x51, 0xed,
+	0x0b, 0x5a, 0xb4, 0x95, 0x1e, 0x23, 0x3f, 0x9b, 0xe7, 0x93, 0xf3, 0x7f, 0x07, 0xa1, 0x71, 0x6e,
+	0x8e, 0xb4, 0x3c, 0x62, 0x61, 0x46, 0xea, 0x6b, 0xcb, 0x74, 0x39, 0x3b, 0x53, 0x94, 0x97, 0xb2,
+	0x64, 0xae, 0x45, 0x5b, 0x31, 0xf0, 0xa2, 0xdb, 0xb4, 0x21, 0xa1, 0x64, 0x3b, 0x95, 0xdd, 0xfd,
+	0xaa, 0xbc, 0xb1, 0xae, 0xa0, 0x53, 0x42, 0x13, 0xed, 0x27, 0x4a, 0xdc, 0x7d, 0x72, 0x55, 0xff,
+	0xfe, 0x3c, 0x77, 0xf2, 0x1d, 0xbe, 0x0b, 0xf2, 0x26, 0xd2, 0x6b, 0x7b, 0xde, 0xfd, 0x58, 0xda,
+	0xbd, 0x78, 0xdd, 0x2e, 0x70, 0xc8, 0xb6, 0xfb, 0xf9, 0xde, 0x5a, 0xb0, 0xac, 0x65, 0xbd, 0xe8,
+	0x0a, 0x52, 0xb3, 0x56, 0xda, 0xaf, 0x14, 0xb5, 0x9f, 0xd3, 0xcc, 0x2e, 0xe5, 0x7f, 0x1e, 0x11,
+	0xfd, 0x3a, 0xcf, 0x85, 0xf3, 0x26, 0x84, 0x0b, 0x7a, 0x4e, 0xb5, 0x92, 0x52, 0xcd, 0x5f, 0xa9,
+	0x4b, 0xc9, 0x5e, 0xfc, 0x2c, 0x3d, 0xc8, 0x78, 0xe5, 0x7d, 0xe9, 0x0a, 0xea, 0x13, 0x5b, 0x66,
+	0x94, 0xb3, 0xab, 0xf7, 0x0f, 0x7a, 0x53, 0x16, 0xae, 0xe1, 0x0b, 0x94, 0xf3, 0x17, 0xe7, 0xbd,
+	0x29, 0xf7, 0xd2, 0x2b, 0x53, 0x4e, 0x34, 0x13, 0xca, 0xe9, 0x4d, 0x7b, 0x43, 0x8d, 0x9e, 0xf8,
+	0xd2, 0x43, 0xf3, 0x17, 0xf3, 0x7c, 0xf7, 0xfe, 0x4f, 0x9e, 0x2f, 0x7f, 0x25, 0xcb, 0x4e, 0x4f,
+	0x61, 0x31, 0x7a, 0x19, 0x22, 0x10, 0x85, 0x7e, 0x04, 0xc4, 0xe7, 0x17, 0x15, 0xe5, 0x3b, 0x02,
+	0xb3, 0x65, 0x31, 0xfd, 0x43, 0x18, 0x22, 0x65, 0x66, 0xe9, 0x20, 0x34, 0x2e, 0x66, 0x3d, 0x2e,
+	0xe5, 0x2b, 0xfc, 0x65, 0x8b, 0xe5, 0xc7, 0xa9, 0x59, 0xc2, 0xf3, 0xdd, 0x6b, 0x65, 0x05, 0xc8,
+	0x10, 0x86, 0x0a, 0xe7, 0xa3, 0x6f, 0x61, 0xea, 0xeb, 0xbf, 0x8c, 0x66, 0x69, 0xb5, 0x40, 0x41,
+	0x3c, 0x57, 0x56, 0x40, 0xb1, 0x40, 0xa1, 0x84, 0x97, 0xa7, 0x8a, 0x33, 0x29, 0xe9, 0xcd, 0xdc,
+	0xf9, 0xe8, 0x93, 0xd1, 0x23, 0xfb, 0x9f, 0x8c, 0x1e, 0xf9, 0xe8, 0x60, 0x54, 0xd9, 0x3f, 0x18,
+	0x55, 0xbe, 0xf9, 0x60, 0xf4, 0xc8, 0x7b, 0x0f, 0x46, 0x95, 0xfd, 0x07, 0xa3, 0x47, 0xfe, 0xf6,
+	0x60, 0xf4, 0xc8, 0x9b, 0xcf, 0xad, 0xdb, 0x6c, 0x23, 0xa8, 0x5d, 0xb1, 0xdc, 0xe6, 0xd5, 0x34,
+	0x6b, 0x15, 0x7e, 0x65, 0xff, 0x59, 0xaa, 0x9d, 0xe0, 0x7f, 0x52, 0xba, 0xf6, 0x9f, 0x00, 0x00,
+	0x00, 0xff, 0xff, 0x43, 0x37, 0xb7, 0x54, 0x10, 0x25, 0x00, 0x00,
 }
 
 func (m *OptionsConfiguration) Marshal() (dAtA []byte, err error) {
@@ -419,6 +430,20 @@ func (m *OptionsConfiguration) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 		i--
 		dAtA[i] = 0xc0
 	}
+	if m.ConnectionLimitMax != 0 {
+		i = encodeVarintOptionsconfiguration(dAtA, i, uint64(m.ConnectionLimitMax))
+		i--
+		dAtA[i] = 0x3
+		i--
+		dAtA[i] = 0xa0
+	}
+	if m.ConnectionLimitEnough != 0 {
+		i = encodeVarintOptionsconfiguration(dAtA, i, uint64(m.ConnectionLimitEnough))
+		i--
+		dAtA[i] = 0x3
+		i--
+		dAtA[i] = 0x98
+	}
 	if len(m.FeatureFlags) > 0 {
 		for iNdEx := len(m.FeatureFlags) - 1; iNdEx >= 0; iNdEx-- {
 			i -= len(m.FeatureFlags[iNdEx])
@@ -1040,6 +1065,12 @@ func (m *OptionsConfiguration) ProtoSize() (n int) {
 			n += 2 + l + sovOptionsconfiguration(uint64(l))
 		}
 	}
+	if m.ConnectionLimitEnough != 0 {
+		n += 2 + sovOptionsconfiguration(uint64(m.ConnectionLimitEnough))
+	}
+	if m.ConnectionLimitMax != 0 {
+		n += 2 + sovOptionsconfiguration(uint64(m.ConnectionLimitMax))
+	}
 	if m.DeprecatedUPnPEnabled {
 		n += 4
 	}
@@ -2218,6 +2249,44 @@ func (m *OptionsConfiguration) Unmarshal(dAtA []byte) error {
 			}
 			m.FeatureFlags = append(m.FeatureFlags, string(dAtA[iNdEx:postIndex]))
 			iNdEx = postIndex
+		case 51:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ConnectionLimitEnough", wireType)
+			}
+			m.ConnectionLimitEnough = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowOptionsconfiguration
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.ConnectionLimitEnough |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 52:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ConnectionLimitMax", wireType)
+			}
+			m.ConnectionLimitMax = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowOptionsconfiguration
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.ConnectionLimitMax |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		case 9000:
 			if wireType != 0 {
 				return fmt.Errorf("proto: wrong wireType = %d for field DeprecatedUPnPEnabled", wireType)

lib/connections/dialqueue.go

@@ -0,0 +1,54 @@
+// Copyright (C) 2021 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package connections
+
+import (
+	"sort"
+	"time"
+
+	"github.com/syncthing/syncthing/lib/protocol"
+	"github.com/syncthing/syncthing/lib/rand"
+)
+
+type dialQueueEntry struct {
+	id         protocol.DeviceID
+	lastSeen   time.Time
+	shortLived bool
+	targets    []dialTarget
+}
+
+type dialQueue []dialQueueEntry
+
+func (queue dialQueue) Sort() {
+	// Sort the queue with the most recently seen device at the head,
+	// increasing the likelihood of connecting to a device that we're
+	// already almost up to date with, index wise.
+	sort.Slice(queue, func(a, b int) bool {
+		qa, qb := queue[a], queue[b]
+		if qa.shortLived != qb.shortLived {
+			return qb.shortLived
+		}
+		return qa.lastSeen.After(qb.lastSeen)
+	})
+
+	// Shuffle the part of the connection queue that are devices we haven't
+	// connected to recently, so that if we only try a limited set of
+	// devices (or they in turn have limits and we're trying to load balance
+	// over several) and the usual ones are down it won't be the same ones
+	// in the same order every time.
+	idx := 0
+	cutoff := time.Now().Add(-recentlySeenCutoff)
+	for idx < len(queue) {
+		if queue[idx].lastSeen.Before(cutoff) {
+			break
+		}
+		idx++
+	}
+	if idx < len(queue)-1 {
+		rand.Shuffle(queue[idx:])
+	}
+}

lib/connections/dialqueue_test.go

@@ -0,0 +1,119 @@
+// Copyright (C) 2021 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package connections
+
+import (
+	"reflect"
+	"testing"
+	"time"
+
+	"github.com/syncthing/syncthing/lib/protocol"
+)
+
+func TestDialQueueSort(t *testing.T) {
+	t.Parallel()
+
+	t.Run("ByLastSeen", func(t *testing.T) {
+		t.Parallel()
+
+		// Devices seen within the last week or so should be sorted stricly in order.
+		now := time.Now()
+		queue := dialQueue{
+			{id: device1, lastSeen: now.Add(-5 * time.Hour)},  // 1
+			{id: device2, lastSeen: now.Add(-50 * time.Hour)}, // 3
+			{id: device3, lastSeen: now.Add(-25 * time.Hour)}, // 2
+			{id: device4, lastSeen: now.Add(-2 * time.Hour)},  // 0
+		}
+		expected := []protocol.ShortID{device4.Short(), device1.Short(), device3.Short(), device2.Short()}
+
+		queue.Sort()
+
+		if !reflect.DeepEqual(shortDevices(queue), expected) {
+			t.Error("expected different order")
+		}
+	})
+
+	t.Run("OldConnections", func(t *testing.T) {
+		t.Parallel()
+
+		// Devices seen long ago should be randomized.
+		now := time.Now()
+		queue := dialQueue{
+			{id: device1, lastSeen: now.Add(-5 * time.Hour)},       // 1
+			{id: device2, lastSeen: now.Add(-50 * 24 * time.Hour)}, // 2, 3
+			{id: device3, lastSeen: now.Add(-25 * 24 * time.Hour)}, // 2, 3
+			{id: device4, lastSeen: now.Add(-2 * time.Hour)},       // 0
+		}
+
+		expected1 := []protocol.ShortID{device4.Short(), device1.Short(), device3.Short(), device2.Short()}
+		expected2 := []protocol.ShortID{device4.Short(), device1.Short(), device2.Short(), device3.Short()}
+
+		var seen1, seen2 int
+
+		for i := 0; i < 100; i++ {
+			queue.Sort()
+			res := shortDevices(queue)
+			if reflect.DeepEqual(res, expected1) {
+				seen1++
+				continue
+			}
+			if reflect.DeepEqual(res, expected2) {
+				seen2++
+				continue
+			}
+			t.Fatal("expected different order")
+		}
+
+		if seen1 < 10 || seen2 < 10 {
+			t.Error("expected more even distribution", seen1, seen2)
+		}
+	})
+
+	t.Run("ShortLivedConnections", func(t *testing.T) {
+		t.Parallel()
+
+		// Short lived connections should be sorted as if they were long ago
+		now := time.Now()
+		queue := dialQueue{
+			{id: device1, lastSeen: now.Add(-5 * time.Hour)},                   // 1
+			{id: device2, lastSeen: now.Add(-3 * time.Hour)},                   // 0
+			{id: device3, lastSeen: now.Add(-25 * 24 * time.Hour)},             // 2, 3
+			{id: device4, lastSeen: now.Add(-2 * time.Hour), shortLived: true}, // 2, 3
+		}
+
+		expected1 := []protocol.ShortID{device2.Short(), device1.Short(), device3.Short(), device4.Short()}
+		expected2 := []protocol.ShortID{device2.Short(), device1.Short(), device4.Short(), device3.Short()}
+
+		var seen1, seen2 int
+
+		for i := 0; i < 100; i++ {
+			queue.Sort()
+			res := shortDevices(queue)
+			if reflect.DeepEqual(res, expected1) {
+				seen1++
+				continue
+			}
+			if reflect.DeepEqual(res, expected2) {
+				seen2++
+				continue
+			}
+			t.Fatal("expected different order")
+		}
+
+		if seen1 < 10 || seen2 < 10 {
+			t.Error("expected more even distribution", seen1, seen2)
+		}
+	})
+}
+
+func shortDevices(queue dialQueue) []protocol.ShortID {
+	res := make([]protocol.ShortID, len(queue))
+	for i, qe := range queue {
+		res[i] = qe.id.Short()
+	}
+	return res
+}

lib/connections/service.go

@@ -55,12 +55,14 @@ var (
 )
 
 const (
-	perDeviceWarningIntv    = 15 * time.Minute
-	tlsHandshakeTimeout     = 10 * time.Second
-	minConnectionReplaceAge = 10 * time.Second
-	minConnectionLoopSleep  = 5 * time.Second
-	stdConnectionLoopSleep  = time.Minute
-	worstDialerPriority     = math.MaxInt32
+	perDeviceWarningIntv          = 15 * time.Minute
+	tlsHandshakeTimeout           = 10 * time.Second
+	minConnectionReplaceAge       = 10 * time.Second
+	minConnectionLoopSleep        = 5 * time.Second
+	stdConnectionLoopSleep        = time.Minute
+	worstDialerPriority           = math.MaxInt32
+	recentlySeenCutoff            = 7 * 24 * time.Hour
+	shortLivedConnectionThreshold = 5 * time.Second
 )
 
 // From go/src/crypto/tls/cipher_suites.go
@@ -415,6 +417,24 @@ func (s *service) bestDialerPriority(cfg config.Configuration) int {
 }
 
 func (s *service) dialDevices(ctx context.Context, now time.Time, cfg config.Configuration, bestDialerPriority int, nextDialAt map[string]time.Time, initial bool) {
+	// Figure out current connection limits up front to see if there's any
+	// point in resolving devices and such at all.
+	allowAdditional := 0 // no limit
+	connectionLimit := cfg.Options.LowestConnectionLimit()
+	if connectionLimit > 0 {
+		current := s.model.NumConnections()
+		allowAdditional = connectionLimit - current
+		if allowAdditional <= 0 {
+			l.Debugf("Skipping dial because we've reached the connection limit, current %d >= limit %d", current, connectionLimit)
+			return
+		}
+	}
+
+	// Get device statistics for the last seen time of each device. This
+	// isn't critical, so ignore the potential error.
+	stats, _ := s.model.DeviceStatistics()
+
+	queue := make(dialQueue, 0, len(cfg.Devices))
 	for _, deviceCfg := range cfg.Devices {
 		// Don't attempt to connect to ourselves...
 		if deviceCfg.DeviceID == s.myID {
@@ -440,8 +460,34 @@ func (s *service) dialDevices(ctx context.Context, now time.Time, cfg config.Con
 		}
 
 		dialTargets := s.resolveDialTargets(ctx, now, cfg, deviceCfg, nextDialAt, initial, priorityCutoff)
-		if conn, ok := s.dialParallel(ctx, deviceCfg.DeviceID, dialTargets); ok {
+		if len(dialTargets) > 0 {
+			queue = append(queue, dialQueueEntry{
+				id:         deviceCfg.DeviceID,
+				lastSeen:   stats[deviceCfg.DeviceID].LastSeen,
+				shortLived: stats[deviceCfg.DeviceID].LastConnectionDurationS < shortLivedConnectionThreshold.Seconds(),
+				targets:    dialTargets,
+			})
+		}
+	}
+
+	// Sort the queue in an order we think will be useful (most recent
+	// first, deprioriting unstable devices, randomizing those we haven't
+	// seen in a long while). If we don't do connection limiting the sorting
+	// doesn't have much effect, but it may result in getting up and running
+	// quicker if only a subset of configured devices are actually reachable
+	// (by prioritizing those that were reachable recently).
+	dialQueue.Sort(queue)
+
+	// Perform dials according to the queue, stopping when we've reached the
+	// allowed additional number of connections (if limited).
+	numConns := 0
+	for _, entry := range queue {
+		if conn, ok := s.dialParallel(ctx, entry.id, entry.targets); ok {
 			s.conns <- conn
+			numConns++
+			if allowAdditional > 0 && numConns >= allowAdditional {
+				break
+			}
 		}
 	}
 }

lib/connections/structs.go

@@ -18,6 +18,7 @@ import (
 	"github.com/syncthing/syncthing/lib/config"
 	"github.com/syncthing/syncthing/lib/nat"
 	"github.com/syncthing/syncthing/lib/protocol"
+	"github.com/syncthing/syncthing/lib/stats"
 
 	"github.com/thejerf/suture/v4"
 )
@@ -193,9 +194,11 @@ type genericListener interface {
 type Model interface {
 	protocol.Model
 	AddConnection(conn protocol.Connection, hello protocol.Hello)
+	NumConnections() int
 	Connection(remoteID protocol.DeviceID) (protocol.Connection, bool)
 	OnHello(protocol.DeviceID, net.Addr, protocol.Hello) error
 	GetHello(protocol.DeviceID) protocol.HelloIntf
+	DeviceStatistics() (map[protocol.DeviceID]stats.DeviceStatistics, error)
 }
 
 type onAddressesChangedNotifier struct {

lib/db/structs.pb.go

@@ -8,10 +8,10 @@ import (
 	_ "github.com/gogo/protobuf/gogoproto"
 	proto "github.com/gogo/protobuf/proto"
 	github_com_gogo_protobuf_types "github.com/gogo/protobuf/types"
-	_ "github.com/golang/protobuf/ptypes/timestamp"
 	github_com_syncthing_syncthing_lib_protocol "github.com/syncthing/syncthing/lib/protocol"
 	protocol "github.com/syncthing/syncthing/lib/protocol"
 	_ "github.com/syncthing/syncthing/proto/ext"
+	_ "google.golang.org/protobuf/types/known/timestamppb"
 	io "io"
 	math "math"
 	math_bits "math/bits"

lib/model/model.go

@@ -101,7 +101,7 @@ type Model interface {
 
 	Completion(device protocol.DeviceID, folder string) FolderCompletion
 	ConnectionStats() map[string]interface{}
-	DeviceStatistics() (map[string]stats.DeviceStatistics, error)
+	DeviceStatistics() (map[protocol.DeviceID]stats.DeviceStatistics, error)
 	FolderStatistics() (map[string]stats.FolderStatistics, error)
 	UsageReportingStats(report *contract.Report, version int, preview bool)
 
@@ -193,6 +193,7 @@ var (
 	errEncryptionReceivedToken         = errors.New("resetting connection to send info on new encrypted folder (new cluster config)")
 	errMissingRemoteInClusterConfig    = errors.New("remote device missing in cluster config")
 	errMissingLocalInClusterConfig     = errors.New("local device missing in cluster config")
+	errConnLimitReached                = errors.New("connection limit reached")
 )
 
 // NewModel creates and starts a new model. The model starts in read-only mode,
@@ -727,6 +728,13 @@ func (info ConnectionInfo) MarshalJSON() ([]byte, error) {
 	})
 }
 
+// NumConnections returns the current number of active connected devices.
+func (m *model) NumConnections() int {
+	m.pmut.RLock()
+	defer m.pmut.RUnlock()
+	return len(m.conn)
+}
+
 // ConnectionStats returns a map with connection statistics for each device.
 func (m *model) ConnectionStats() map[string]interface{} {
 	m.pmut.RLock()
@@ -773,16 +781,16 @@ func (m *model) ConnectionStats() map[string]interface{} {
 }
 
 // DeviceStatistics returns statistics about each device
-func (m *model) DeviceStatistics() (map[string]stats.DeviceStatistics, error) {
+func (m *model) DeviceStatistics() (map[protocol.DeviceID]stats.DeviceStatistics, error) {
 	m.fmut.RLock()
 	defer m.fmut.RUnlock()
-	res := make(map[string]stats.DeviceStatistics, len(m.deviceStatRefs))
+	res := make(map[protocol.DeviceID]stats.DeviceStatistics, len(m.deviceStatRefs))
 	for id, sr := range m.deviceStatRefs {
 		stats, err := sr.GetStatistics()
 		if err != nil {
 			return nil, err
 		}
-		res[id.String()] = stats
+		res[id] = stats
 	}
 	return res, nil
 }
@@ -2049,10 +2057,14 @@ func (m *model) OnHello(remoteID protocol.DeviceID, addr net.Addr, hello protoco
 		return errDevicePaused
 	}
 
-	if len(cfg.AllowedNetworks) > 0 {
-		if !connections.IsAllowedNetwork(addr.String(), cfg.AllowedNetworks) {
-			return errNetworkNotAllowed
-		}
+	if len(cfg.AllowedNetworks) > 0 && !connections.IsAllowedNetwork(addr.String(), cfg.AllowedNetworks) {
+		// The connection is not from an allowed network.
+		return errNetworkNotAllowed
+	}
+
+	if max := m.cfg.Options().ConnectionLimitMax; max > 0 && m.NumConnections() >= max {
+		// We're not allowed to accept any more connections.
+		return errConnLimitReached
 	}
 
 	return nil

lib/model/model_test.go

@@ -3407,7 +3407,7 @@ func TestDeviceWasSeen(t *testing.T) {
 	if err != nil {
 		t.Error("Unexpected error:", err)
 	}
-	entry := stats[device1.String()]
+	entry := stats[device1]
 	if time.Since(entry.LastSeen) > time.Second {
 		t.Error("device should have been seen now")
 	}

proto/lib/config/optionsconfiguration.proto

@@ -58,6 +58,14 @@ message OptionsConfiguration {
     bool            send_full_index_on_upgrade               = 49;
     repeated string feature_flags                            = 50;
 
+    // The number of connections at which we stop trying to connect to more
+    // devices, zero meaning no limit. Does not affect incoming connections.
+    int32 connection_limit_enough = 51;
+
+    // The maximum number of connections which we will allow in total, zero
+    // meaning no limit. Affects incoming connections and prevents
+    // attempting outgoing connections.
+    int32 connection_limit_max = 52;
 
     // Legacy deprecated
     bool            upnp_enabled           = 9000 [deprecated = true, (ext.goname) = "DeprecatedUPnPEnabled"];