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| author | bitstrings <pino.silvaggio@gmail.com> | 2021-01-29 23:37:14 -0500 |
|---|---|---|
| committer | Matthew Heon <matthew.heon@pm.me> | 2021-02-04 14:19:00 -0500 |
| commit | 6d9217228b87e5ea5b0e215701d8e001c44e1917 (patch) | |
| tree | 3f707badef40577d69bfb9ffc7210f920ebea573 /libpod | |
| parent | 3b712d96157b718e76ea7fe5b5bb91a5ddd9f2a4 (diff) | |
| download | podman-6d9217228b87e5ea5b0e215701d8e001c44e1917.tar.gz podman-6d9217228b87e5ea5b0e215701d8e001c44e1917.tar.bz2 podman-6d9217228b87e5ea5b0e215701d8e001c44e1917.zip | |
Make slirp MTU configurable (network_cmd_options)
The mtu default value is currently forced to 65520.
This let the user control it using the config key network_cmd_options,
i.e.: network_cmd_options=["mtu=9000"]
Signed-off-by: bitstrings <pino.silvaggio@gmail.com>
Diffstat (limited to 'libpod')
| -rw-r--r-- | libpod/networking_linux.go | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/libpod/networking_linux.go b/libpod/networking_linux.go index ffd39dfa9..2eabec634 100644 --- a/libpod/networking_linux.go +++ b/libpod/networking_linux.go @@ -15,6 +15,7 @@ import ( "path/filepath" "regexp" "sort" + "strconv" "strings" "syscall" "time" @@ -42,6 +43,9 @@ const ( // slirp4netnsDNS is the IP for the built-in DNS server in the slirp network slirp4netnsDNS = "10.0.2.3" + + // slirp4netnsMTU the default MTU override + slirp4netnsMTU = 65520 ) // Get an OCICNI network config @@ -282,6 +286,7 @@ func (r *Runtime) setupSlirp4netns(ctr *Container) error { enableIPv6 := false outboundAddr := "" outboundAddr6 := "" + mtu := slirp4netnsMTU if ctr.config.NetworkOptions != nil { slirpOptions = append(slirpOptions, ctr.config.NetworkOptions["slirp4netns"]...) @@ -345,6 +350,11 @@ func (r *Runtime) setupSlirp4netns(ctr *Container) error { } } outboundAddr6 = value + case "mtu": + mtu, err = strconv.Atoi(value) + if mtu < 68 || err != nil { + return errors.Errorf("invalid mtu %q", value) + } default: return errors.Errorf("unknown option for slirp4netns: %q", o) } @@ -358,8 +368,8 @@ func (r *Runtime) setupSlirp4netns(ctr *Container) error { if disableHostLoopback && slirpFeatures.HasDisableHostLoopback { cmdArgs = append(cmdArgs, "--disable-host-loopback") } - if slirpFeatures.HasMTU { - cmdArgs = append(cmdArgs, "--mtu", "65520") + if mtu > -1 && slirpFeatures.HasMTU { + cmdArgs = append(cmdArgs, fmt.Sprintf("--mtu=%d", mtu)) } if !noPivotRoot && slirpFeatures.HasEnableSandbox { cmdArgs = append(cmdArgs, "--enable-sandbox") |