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Merge pull request #9941 from Luap99/fix-9828

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Fix rootlesskit port forwarder with custom slirp cidr
This commit is contained in:
OpenShift Merge Robot
2021-04-27 05:44:22 -04:00
committed by GitHub
parent 54344d3a64 f99b7a314b
commit e6fc34b71a
3 changed files with 50 additions and 28 deletions
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2
libpod/networking_linux.go
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@ -577,7 +577,7 @@ func (r *Runtime) setupRootlessNetNS(ctr *Container) error {
// set up port forwarder for CNI-in-slirp4netns // set up port forwarder for CNI-in-slirp4netns
netnsPath := ctr.state.NetNS.Path() netnsPath := ctr.state.NetNS.Path()
// TODO: support slirp4netns port forwarder as well // TODO: support slirp4netns port forwarder as well
return r.setupRootlessPortMappingViaRLK(ctr, netnsPath) return r.setupRootlessPortMappingViaRLK(ctr, netnsPath, "")
} }
return nil return nil
} }

14
libpod/networking_slirp4netns.go
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@ -312,7 +312,7 @@ func (r *Runtime) setupSlirp4netns(ctr *Container) error {
if netOptions.isSlirpHostForward { if netOptions.isSlirpHostForward {
return r.setupRootlessPortMappingViaSlirp(ctr, cmd, apiSocket) return r.setupRootlessPortMappingViaSlirp(ctr, cmd, apiSocket)
} }
return r.setupRootlessPortMappingViaRLK(ctr, netnsPath) return r.setupRootlessPortMappingViaRLK(ctr, netnsPath, netOptions.cidr)
} }
return nil return nil
} }
@ -363,7 +363,7 @@ func waitForSync(syncR *os.File, cmd *exec.Cmd, logFile io.ReadSeeker, timeout t
return nil return nil
} }
func (r *Runtime) setupRootlessPortMappingViaRLK(ctr *Container, netnsPath string) error { func (r *Runtime) setupRootlessPortMappingViaRLK(ctr *Container, netnsPath, slirp4CIDR string) error {
syncR, syncW, err := os.Pipe() syncR, syncW, err := os.Pipe()
if err != nil { if err != nil {
return errors.Wrapf(err, "failed to open pipe") return errors.Wrapf(err, "failed to open pipe")
@ -391,6 +391,16 @@ func (r *Runtime) setupRootlessPortMappingViaRLK(ctr *Container, netnsPath strin
} }
childIP := slirp4netnsIP childIP := slirp4netnsIP
// set the correct childIP when a custom cidr is set
if slirp4CIDR != "" {
_, cidr, err := net.ParseCIDR(slirp4CIDR)
if err != nil {
return errors.Wrap(err, "failed to parse slirp4netns cidr")
}
// the slirp container ip is always the hundredth ip in the subnet
cidr.IP[len(cidr.IP)-1] = cidr.IP[len(cidr.IP)-1] + 100
childIP = cidr.IP.String()
}
outer: outer:
for _, r := range ctr.state.NetworkStatus { for _, r := range ctr.state.NetworkStatus {
for _, i := range r.IPs { for _, i := range r.IPs {

22
test/system/500-networking.bats
View File

@ -77,13 +77,25 @@ load helpers
# FIXME: randomize port, and create second random host port # FIXME: randomize port, and create second random host port
myport=54321 myport=54321
for cidr in "" "$(random_rfc1918_subnet).0/24"; do
myport=$(( myport + 1 ))
if [[ -z $cidr ]]; then
# regex to match that we are in 10.X subnet
match="10\..*"
else
# Issue #9828 make sure a custom slir4netns cidr also works
network_arg="--network slirp4netns:cidr=$cidr"
# slirp4netns interface ip is always .100
match="${cidr%.*}.100"
fi
# Container will exit as soon as 'nc' receives input # Container will exit as soon as 'nc' receives input
# We use '-n -v' to give us log messages showing an incoming connection # We use '-n -v' to give us log messages showing an incoming connection
# and its IP address; the purpose of that is guaranteeing that the # and its IP address; the purpose of that is guaranteeing that the
# remote IP is not 127.0.0.1 (podman PR #9052). # remote IP is not 127.0.0.1 (podman PR #9052).
# We could get more parseable output by using $NCAT_REMOTE_ADDR, # We could get more parseable output by using $NCAT_REMOTE_ADDR,
# but busybox nc doesn't support that. # but busybox nc doesn't support that.
run_podman run -d --userns=keep-id -p 127.0.0.1:$myport:$myport \ run_podman run -d --userns=keep-id $network_arg -p 127.0.0.1:$myport:$myport \
$IMAGE nc -l -n -v -p $myport $IMAGE nc -l -n -v -p $myport
cid="$output" cid="$output"
@ -97,15 +109,15 @@ load helpers
# string, but sometimes we get it after. So, just do substring checks. # string, but sometimes we get it after. So, just do substring checks.
is "$output" ".*listening on \[::\]:$myport .*" "nc -v shows right port" is "$output" ".*listening on \[::\]:$myport .*" "nc -v shows right port"
# This is the truly important check: make sure the remote IP is # This is the truly important check: make sure the remote IP is not 127.X.
# in the 10.X range, not 127.X.
is "$output" \ is "$output" \
".*connect to \[::ffff:10\..*\]:$myport from \[::ffff:10\..*\]:.*" \ ".*connect to \[::ffff:$match*\]:$myport from \[::ffff:$match\]:.*" \
"nc -v shows remote IP address in 10.X space (not 127.0.0.1)" "nc -v shows remote IP address is not 127.0.0.1"
is "$output" ".*${teststring}.*" "test string received on container" is "$output" ".*${teststring}.*" "test string received on container"
# Clean up # Clean up
run_podman rm $cid run_podman rm $cid
done
} }
# "network create" now works rootless, with the help of a special container # "network create" now works rootless, with the help of a special container