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Merge pull request #43505 from thaJeztah/libnetwork_no_string_fields 

libnetwork: don't use strings.Fields() to improve performance
This commit is contained in:
Samuel Karp 2022-04-21 00:57:55 -07:00 committed by GitHub
parent 7d9c114fd4 301b252b58
commit c5f18aac9f
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 56 additions and 48 deletions
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104
libnetwork/service_linux.go
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@ -381,7 +381,7 @@ func programIngress(gwIP net.IP, ingressPorts []*PortConfig, isDelete bool) erro
return fmt.Errorf("could not write to %s: %v", path, err)
}
ruleArgs := strings.Fields(fmt.Sprintf("-m addrtype --src-type LOCAL -o %s -j MASQUERADE", oifName))
ruleArgs := []string{"-m", "addrtype", "--src-type", "LOCAL", "-o", oifName, "-j", "MASQUERADE"}
if !iptable.Exists(iptables.Nat, "POSTROUTING", ruleArgs...) {
if err := iptable.RawCombinedOutput(append([]string{"-t", "nat", "-I", "POSTROUTING"}, ruleArgs...)...); err != nil {
return fmt.Errorf("failed to add ingress localhost POSTROUTING rule for %s: %v", oifName, err)
@ -389,7 +389,7 @@ func programIngress(gwIP net.IP, ingressPorts []*PortConfig, isDelete bool) erro
}
}
//Filter the ingress ports until port rules start to be added/deleted
// Filter the ingress ports until port rules start to be added/deleted
filteredPorts := filterPortConfigs(ingressPorts, isDelete)
rollbackRules := make([][]string, 0, len(filteredPorts)*3)
var portErr error
@ -405,52 +405,52 @@ func programIngress(gwIP net.IP, ingressPorts []*PortConfig, isDelete bool) erro
}()
for _, iPort := range filteredPorts {
var (
protocol = strings.ToLower(PortConfig_Protocol_name[int32(iPort.Protocol)])
publishedPort = strconv.FormatUint(uint64(iPort.PublishedPort), 10)
destination = net.JoinHostPort(gwIP.String(), publishedPort)
)
if iptable.ExistChain(ingressChain, iptables.Nat) {
rule := strings.Fields(fmt.Sprintf("-t nat %s %s -p %s --dport %d -j DNAT --to-destination %s:%d",
addDelOpt, ingressChain, strings.ToLower(PortConfig_Protocol_name[int32(iPort.Protocol)]), iPort.PublishedPort, gwIP, iPort.PublishedPort))
rule := []string{"-t", "nat", addDelOpt, ingressChain, "-p", protocol, "--dport", publishedPort, "-j", "DNAT", "--to-destination", destination}
if portErr = iptable.RawCombinedOutput(rule...); portErr != nil {
errStr := fmt.Sprintf("set up rule failed, %v: %v", rule, portErr)
err := fmt.Errorf("set up rule failed, %v: %v", rule, portErr)
if !isDelete {
return fmt.Errorf("%s", errStr)
return err
}
logrus.Infof("%s", errStr)
logrus.Info(err)
}
rollbackRule := strings.Fields(fmt.Sprintf("-t nat %s %s -p %s --dport %d -j DNAT --to-destination %s:%d", rollbackAddDelOpt,
ingressChain, strings.ToLower(PortConfig_Protocol_name[int32(iPort.Protocol)]), iPort.PublishedPort, gwIP, iPort.PublishedPort))
rollbackRule := []string{"-t", "nat", rollbackAddDelOpt, ingressChain, "-p", protocol, "--dport", publishedPort, "-j", "DNAT", "--to-destination", destination}
rollbackRules = append(rollbackRules, rollbackRule)
}
// Filter table rules to allow a published service to be accessible in the local node from..
// 1) service tasks attached to other networks
// 2) unmanaged containers on bridge networks
rule := strings.Fields(fmt.Sprintf("%s %s -m state -p %s --sport %d --state ESTABLISHED,RELATED -j ACCEPT",
addDelOpt, ingressChain, strings.ToLower(PortConfig_Protocol_name[int32(iPort.Protocol)]), iPort.PublishedPort))
rule := []string{addDelOpt, ingressChain, "-m", "state", "-p", protocol, "--sport", publishedPort, "--state", "ESTABLISHED,RELATED", "-j", "ACCEPT"}
if portErr = iptable.RawCombinedOutput(rule...); portErr != nil {
errStr := fmt.Sprintf("set up rule failed, %v: %v", rule, portErr)
err := fmt.Errorf("set up rule failed, %v: %v", rule, portErr)
if !isDelete {
return fmt.Errorf("%s", errStr)
return err
}
logrus.Warnf("%s", errStr)
logrus.Warn(err)
}
rollbackRule := strings.Fields(fmt.Sprintf("%s %s -m state -p %s --sport %d --state ESTABLISHED,RELATED -j ACCEPT", rollbackAddDelOpt,
ingressChain, strings.ToLower(PortConfig_Protocol_name[int32(iPort.Protocol)]), iPort.PublishedPort))
rollbackRule := []string{rollbackAddDelOpt, ingressChain, "-m", "state", "-p", protocol, "--sport", publishedPort, "--state", "ESTABLISHED,RELATED", "-j", "ACCEPT"}
rollbackRules = append(rollbackRules, rollbackRule)
rule = strings.Fields(fmt.Sprintf("%s %s -p %s --dport %d -j ACCEPT",
addDelOpt, ingressChain, strings.ToLower(PortConfig_Protocol_name[int32(iPort.Protocol)]), iPort.PublishedPort))
rule = []string{addDelOpt, ingressChain, "-p", protocol, "--dport", publishedPort, "-j", "ACCEPT"}
if portErr = iptable.RawCombinedOutput(rule...); portErr != nil {
errStr := fmt.Sprintf("set up rule failed, %v: %v", rule, portErr)
err := fmt.Errorf("set up rule failed, %v: %v", rule, portErr)
if !isDelete {
return fmt.Errorf("%s", errStr)
return err
}
logrus.Warnf("%s", errStr)
logrus.Warn(err)
}
rollbackRule = strings.Fields(fmt.Sprintf("%s %s -p %s --dport %d -j ACCEPT", rollbackAddDelOpt,
ingressChain, strings.ToLower(PortConfig_Protocol_name[int32(iPort.Protocol)]), iPort.PublishedPort))
rollbackRule = []string{rollbackAddDelOpt, ingressChain, "-p", protocol, "--dport", publishedPort, "-j", "ACCEPT"}
rollbackRules = append(rollbackRules, rollbackRule)
if err := plumbProxy(iPort, isDelete); err != nil {
logrus.Warnf("failed to create proxy for port %d: %v", iPort.PublishedPort, err)
logrus.Warnf("failed to create proxy for port %s: %v", publishedPort, err)
}
}
@ -631,17 +631,20 @@ func fwMarker() {
}
vip := os.Args[2]
fwMark, err := strconv.ParseUint(os.Args[3], 10, 32)
if err != nil {
logrus.Errorf("bad fwmark value(%s) passed: %v", os.Args[3], err)
fwMark := os.Args[3]
if _, err := strconv.ParseUint(fwMark, 10, 32); err != nil {
logrus.Errorf("bad fwmark value(%s) passed: %v", fwMark, err)
os.Exit(3)
}
addDelOpt := os.Args[4]
rules := [][]string{}
rules := make([][]string, 0, len(ingressPorts))
for _, iPort := range ingressPorts {
rule := strings.Fields(fmt.Sprintf("-t mangle %s PREROUTING -p %s --dport %d -j MARK --set-mark %d",
addDelOpt, strings.ToLower(PortConfig_Protocol_name[int32(iPort.Protocol)]), iPort.PublishedPort, fwMark))
var (
protocol = strings.ToLower(PortConfig_Protocol_name[int32(iPort.Protocol)])
publishedPort = strconv.FormatUint(uint64(iPort.PublishedPort), 10)
)
rule := []string{"-t", "mangle", addDelOpt, "PREROUTING", "-p", protocol, "--dport", publishedPort, "-j", "MARK", "--set-mark", fwMark}
rules = append(rules, rule)
}
@ -665,9 +668,9 @@ func fwMarker() {
os.Exit(6)
}
ruleParams := strings.Fields(fmt.Sprintf("-m ipvs --ipvs -d %s -j SNAT --to-source %s", subnet, eIP))
ruleParams := []string{"-m", "ipvs", "--ipvs", "-d", subnet.String(), "-j", "SNAT", "--to-source", eIP.String()}
if !iptable.Exists("nat", "POSTROUTING", ruleParams...) {
rule := append(strings.Fields("-t nat -A POSTROUTING"), ruleParams...)
rule := append([]string{"-t", "nat", "-A", "POSTROUTING"}, ruleParams...)
rules = append(rules, rule)
err := os.WriteFile("/proc/sys/net/ipv4/vs/conntrack", []byte{'1', '\n'}, 0644)
@ -678,7 +681,7 @@ func fwMarker() {
}
}
rule := strings.Fields(fmt.Sprintf("-t mangle %s INPUT -d %s/32 -j MARK --set-mark %d", addDelOpt, vip, fwMark))
rule := []string{"-t", "mangle", addDelOpt, "INPUT", "-d", vip + "/32", "-j", "MARK", "--set-mark", fwMark}
rules = append(rules, rule)
for _, rule := range rules {
@ -742,20 +745,25 @@ func redirector() {
logrus.Errorf("Failed to parse endpoint IP %s: %v", os.Args[2], err)
os.Exit(3)
}
ipAddr := eIP.String()
rules := [][]string{}
rules := make([][]string, 0, len(ingressPorts)*3) // 3 rules per port
for _, iPort := range ingressPorts {
rule := strings.Fields(fmt.Sprintf("-t nat -A PREROUTING -d %s -p %s --dport %d -j REDIRECT --to-port %d",
eIP.String(), strings.ToLower(PortConfig_Protocol_name[int32(iPort.Protocol)]), iPort.PublishedPort, iPort.TargetPort))
rules = append(rules, rule)
// Allow only incoming connections to exposed ports
iRule := strings.Fields(fmt.Sprintf("-I INPUT -d %s -p %s --dport %d -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT",
eIP.String(), strings.ToLower(PortConfig_Protocol_name[int32(iPort.Protocol)]), iPort.TargetPort))
rules = append(rules, iRule)
// Allow only outgoing connections from exposed ports
oRule := strings.Fields(fmt.Sprintf("-I OUTPUT -s %s -p %s --sport %d -m conntrack --ctstate ESTABLISHED -j ACCEPT",
eIP.String(), strings.ToLower(PortConfig_Protocol_name[int32(iPort.Protocol)]), iPort.TargetPort))
rules = append(rules, oRule)
var (
protocol = strings.ToLower(PortConfig_Protocol_name[int32(iPort.Protocol)])
publishedPort = strconv.FormatUint(uint64(iPort.PublishedPort), 10)
targetPort = strconv.FormatUint(uint64(iPort.TargetPort), 10)
)
rules = append(rules,
[]string{"-t", "nat", "-A", "PREROUTING", "-d", ipAddr, "-p", protocol, "--dport", publishedPort, "-j", "REDIRECT", "--to-port", targetPort},
// Allow only incoming connections to exposed ports
[]string{"-I", "INPUT", "-d", ipAddr, "-p", protocol, "--dport", targetPort, "-m", "conntrack", "--ctstate", "NEW,ESTABLISHED", "-j", "ACCEPT"},
// Allow only outgoing connections from exposed ports
[]string{"-I", "OUTPUT", "-s", ipAddr, "-p", protocol, "--sport", targetPort, "-m", "conntrack", "--ctstate", "ESTABLISHED", "-j", "ACCEPT"},
)
}
ns, err := netns.GetFromPath(os.Args[1])
@ -783,9 +791,9 @@ func redirector() {
// Ensure blocking rules for anything else in/to ingress network
for _, rule := range [][]string{
{"-d", eIP.String(), "-p", "sctp", "-j", "DROP"},
{"-d", eIP.String(), "-p", "udp", "-j", "DROP"},
{"-d", eIP.String(), "-p", "tcp", "-j", "DROP"},
{"-d", ipAddr, "-p", "sctp", "-j", "DROP"},
{"-d", ipAddr, "-p", "udp", "-j", "DROP"},
{"-d", ipAddr, "-p", "tcp", "-j", "DROP"},
} {
if !iptable.ExistsNative(iptables.Filter, "INPUT", rule...) {
if err := iptable.RawCombinedOutputNative(append([]string{"-A", "INPUT"}, rule...)...); err != nil {