Change in osmo-ci[master]: ansible: gsm-tester: Enable ip forwarding and masquerading on boot

[pespin]

pespin has submitted this change. ( https://gerrit.osmocom.org/c/osmo-ci/+/16226 )

Change subject: ansible: gsm-tester: Enable ip forwarding and masquerading on boot
......................................................................

ansible: gsm-tester: Enable ip forwarding and masquerading on boot

Some nodes in the internal network, such as LimeNetMicro, will need
Internet access to upgrade osmo-trx-lms from OBS repos.
It also makes it easier to update manually other nodes inside the
internal network.

Change-Id: I2c89cf9cfcb55b3153e7be212c68ffa8db0f6927
---
M ansible/roles/gsm-tester-network/README.md
M ansible/roles/gsm-tester-network/defaults/main.yml
A ansible/roles/gsm-tester-network/files/ogt-sysctl.conf
M ansible/roles/gsm-tester-network/tasks/main.yml
A ansible/roles/gsm-tester-network/templates/etc/iptables-ogt
5 files changed, 34 insertions(+), 2 deletions(-)

Approvals:
  laforge: Looks good to me, but someone else must approve
  neels: Looks good to me, but someone else must approve
  pespin: Looks good to me, approved; Verified



diff --git a/ansible/roles/gsm-tester-network/README.md b/ansible/roles/gsm-tester-network/README.md
index e324929..689a127 100644
--- a/ansible/roles/gsm-tester-network/README.md
+++ b/ansible/roles/gsm-tester-network/README.md
@@ -4,4 +4,5 @@
 
 # variables
 
-- `bts_interface` (eth1): on which network interface the bts is configured.
+- `bts_interface` (enp2s0): on which network interface the bts is configured.
+- `gw_interface` (enp1s0): on which network interface the traffic is routed towards default gateway.
diff --git a/ansible/roles/gsm-tester-network/defaults/main.yml b/ansible/roles/gsm-tester-network/defaults/main.yml
index 3e506da..5bfdf63 100644
--- a/ansible/roles/gsm-tester-network/defaults/main.yml
+++ b/ansible/roles/gsm-tester-network/defaults/main.yml
@@ -1,3 +1,4 @@
 ---
 
-bts_interface: eth1
+bts_interface: enp2s0
+gw_interface: enp1s0
diff --git a/ansible/roles/gsm-tester-network/files/ogt-sysctl.conf b/ansible/roles/gsm-tester-network/files/ogt-sysctl.conf
new file mode 100644
index 0000000..119d730
--- /dev/null
+++ b/ansible/roles/gsm-tester-network/files/ogt-sysctl.conf
@@ -0,0 +1 @@
+net.ipv4.ip_forward=1
diff --git a/ansible/roles/gsm-tester-network/tasks/main.yml b/ansible/roles/gsm-tester-network/tasks/main.yml
index 210bf1e..b77fc0e 100644
--- a/ansible/roles/gsm-tester-network/tasks/main.yml
+++ b/ansible/roles/gsm-tester-network/tasks/main.yml
@@ -9,3 +9,15 @@
 - name: start all network interface
   command: ifup -a
   when: gsm_tester_network_interface is changed
+
+- name: allow ip forwarding and masquerading traffic from internal network (iptables)
+  template:
+    src: etc/iptables-ogt
+    dest: /etc/network/if-up.d/iptables-ogt
+    mode: 0755
+
+- name: allow ip forwarding from internal network (sysctl)
+  copy:
+    src: ogt-sysctl.conf
+    dest: /etc/sysctl.d
+  notify: restart udev
diff --git a/ansible/roles/gsm-tester-network/templates/etc/iptables-ogt b/ansible/roles/gsm-tester-network/templates/etc/iptables-ogt
new file mode 100644
index 0000000..5a781c5
--- /dev/null
+++ b/ansible/roles/gsm-tester-network/templates/etc/iptables-ogt
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+IPT="/sbin/iptables"
+
+if [ "$IFACE" = "{{ gw_interface }}" ]; then
+  # Apply masquerading if not yet applied:
+  if [ "x$($IPT -t nat -S | grep "\-A POSTROUTING -o {{ gw_interface }} -j MASQUERADE" -c)" = "x0" ]; then
+        $IPT -t nat -A POSTROUTING -o {{ gw_interface }} -j MASQUERADE
+  fi
+
+  # Allow IP forwarding if not yet enabled:
+  if [ "x$($IPT -t filter -S | grep "\-A FORWARD -j ACCEPT" -c)" = "x0" ]; then
+    $IPT -t filter -A FORWARD -j ACCEPT
+  fi
+
+  echo "osmo-gsm-tester iptables rules loaded."
+fi

-- 
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Gerrit-Project: osmo-ci
Gerrit-Branch: master
Gerrit-Change-Id: I2c89cf9cfcb55b3153e7be212c68ffa8db0f6927
Gerrit-Change-Number: 16226
Gerrit-PatchSet: 4
Gerrit-Owner: pespin <pespin at sysmocom.de>
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-Reviewer: lynxis lazus <lynxis at fe80.eu>
Gerrit-Reviewer: neels <nhofmeyr at sysmocom.de>
Gerrit-Reviewer: pespin <pespin at sysmocom.de>
Gerrit-MessageType: merged
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