nft: rewrite source IP in outgoing GTP-U

Change-Id: I6d293c1dc69d1bab714564f48e3f85b769501d13
---
M src/osmo-upf/upf_nft.c
1 file changed, 4 insertions(+), 0 deletions(-)


git pull ssh://gerrit.osmocom.org:29418/osmo-upf refs/changes/93/30493/1

diff --git a/src/osmo-upf/upf_nft.c b/src/osmo-upf/upf_nft.c
index 695ec20..a8ca90d 100644
--- a/src/osmo-upf/upf_nft.c
+++ b/src/osmo-upf/upf_nft.c
@@ -136,6 +136,10 @@
 	/* Match on the TEID in the header */
 	OSMO_STRBUF_PRINTF(sb, " @ih,32,32 0x%08x", from_peer->teid_local);
 
+	/* Change outgoing address to local IP on outgoing interface */
+	OSMO_STRBUF_PRINTF(sb, " ip saddr set ");
+	OSMO_STRBUF_APPEND(sb, osmo_sockaddr_to_str_buf2, to_peer->addr_local);
+
 	/* Change destination address to to_peer */
 	OSMO_STRBUF_PRINTF(sb, " ip daddr set ");
 	OSMO_STRBUF_APPEND(sb, osmo_sockaddr_to_str_buf2, to_peer->addr_remote);

