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Check for fwmark and ip rule support and unify env vars
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,11 @@ | ||
| //go:build !linux || android | ||
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| package net | ||
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| func Init() { | ||
| } | ||
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| func AdvancedRouting() bool { | ||
| // non-linux currently doesn't support advanced routing | ||
| return false | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| //go:build linux && !android | ||
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| package net | ||
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| import ( | ||
| "errors" | ||
| "os" | ||
| "strconv" | ||
| "syscall" | ||
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| log "github.com/sirupsen/logrus" | ||
| "github.com/vishvananda/netlink" | ||
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| "github.com/netbirdio/netbird/client/iface/netstack" | ||
| ) | ||
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| const ( | ||
| // these have the same effect, skip socket env supported for backward compatibility | ||
| envSkipSocketMark = "NB_SKIP_SOCKET_MARK" | ||
| envUseLegacyRouting = "NB_USE_LEGACY_ROUTING" | ||
| ) | ||
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| var advancedRoutingSupported bool | ||
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| func Init() { | ||
| advancedRoutingSupported = checkAdvancedRoutingSupport() | ||
| } | ||
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| func AdvancedRouting() bool { | ||
| return advancedRoutingSupported | ||
| } | ||
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| func checkAdvancedRoutingSupport() bool { | ||
| var err error | ||
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| var legacyRouting bool | ||
| if val := os.Getenv("NB_USE_LEGACY_ROUTING"); val != "" { | ||
| legacyRouting, err = strconv.ParseBool(val) | ||
| if err != nil { | ||
| log.Warnf("failed to parse %s: %v", envUseLegacyRouting, err) | ||
| } | ||
| } | ||
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| var skipSocketMark bool | ||
| if val := os.Getenv(envSkipSocketMark); val != "" { | ||
| skipSocketMark, err = strconv.ParseBool(val) | ||
| if err != nil { | ||
| log.Warnf("failed to parse %s: %v", envSkipSocketMark, err) | ||
| } | ||
| } | ||
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| // requested to disable advanced routing | ||
| if legacyRouting || skipSocketMark || | ||
| // envCustomRoutingDisabled disables the custom dialers. | ||
| // There is no point in using advanced routing without those, as they set up fwmarks on the sockets. | ||
| CustomRoutingDisabled() || | ||
| // netstack mode doesn't need routing at all | ||
| netstack.IsEnabled() { | ||
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| log.Info("advanced routing has been requested to be disabled") | ||
| return false | ||
| } | ||
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| if !CheckFwmarkSupport() || !CheckRuleOperationsSupport() { | ||
| log.Warn("system doesn't support required routing features, falling back to legacy routing") | ||
| return false | ||
| } | ||
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| return true | ||
| } | ||
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| func CheckFwmarkSupport() bool { | ||
| fd, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_DGRAM, 0) | ||
| if err != nil { | ||
| log.Warnf("failed to create test socket: %v", err) | ||
| return false | ||
| } | ||
| defer syscall.Close(fd) | ||
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| err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_MARK, 1) | ||
| if err != nil { | ||
| log.Warnf("fwmark is not supported: %v", err) | ||
| return false | ||
| } | ||
| return true | ||
| } | ||
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| func CheckRuleOperationsSupport() bool { | ||
| rule := netlink.NewRule() | ||
| // low precedence, semi-random | ||
| rule.Priority = 32321 | ||
| rule.Table = syscall.RT_TABLE_MAIN | ||
| rule.Family = netlink.FAMILY_V4 | ||
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| if err := netlink.RuleAdd(rule); err != nil { | ||
| if errors.Is(err, syscall.EOPNOTSUPP) { | ||
| log.Warn("IP rule operations are not supported") | ||
| return false | ||
| } | ||
| log.Warnf("failed to test rule support: %v", err) | ||
| return false | ||
| } | ||
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| if err := netlink.RuleDel(rule); err != nil { | ||
| log.Warnf("failed to delete test rule: %v", err) | ||
| } | ||
| return true | ||
| } |
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