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Make compatible with private pfcp structs

Adjust OsmoHNBGW to build with newer versions of libosmo-pfcp, where
osmo_pfcp_cp_peer was made private. This based on Pau's patch 1ac1d127
("hnbgw: Avoid using struct osmo_pfcp_cp_peer fields directly").

Related: OS#6617
Change-Id: I188e76307deadd9328430afff54dc287eda51370
---
M configure.ac
M src/osmo-hnbgw/context_map_sccp.c
M src/osmo-hnbgw/ps_rab_fsm.c
3 files changed, 16 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-hnbgw refs/changes/35/38735/1

diff --git a/configure.ac b/configure.ac
index b6f013e..ac1fc0f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -228,6 +228,12 @@
 AC_MSG_RESULT([CFLAGS="$CFLAGS"])
 AC_MSG_RESULT([CPPFLAGS="$CPPFLAGS"])
 
+# OS#6617
+AC_CHECK_DECL([osmo_pfcp_cp_peer_next_seid],
+	      [AC_DEFINE(PFCP_PRIVATE_STRUCTS, [1], ["OS#6617"])],
+	      [],
+	      [[#include <osmocom/pfcp/pfcp_cp_peer.h>]])
+
 dnl Generate the output
 AM_CONFIG_HEADER(config.h)
 
diff --git a/src/osmo-hnbgw/context_map_sccp.c b/src/osmo-hnbgw/context_map_sccp.c
index 511577c..a92b3d6 100644
--- a/src/osmo-hnbgw/context_map_sccp.c
+++ b/src/osmo-hnbgw/context_map_sccp.c
@@ -241,7 +241,11 @@
 				if (hnb_gw_is_gtp_mapping_enabled()) {
 					LOGP(DMAIN, LOGL_DEBUG,
 					     "RAB Assignment: setting up GTP tunnel mapping via UPF %s\n",
+#ifdef PFCP_PRIVATE_STRUCTS
+					     osmo_sockaddr_to_str_c(OTC_SELECT, osmo_pfcp_cp_peer_get_remote_addr(g_hnbgw->pfcp.cp_peer)));
+#else
 					     osmo_sockaddr_to_str_c(OTC_SELECT, &g_hnbgw->pfcp.cp_peer->remote_addr));
+#endif
 					return hnbgw_gtpmap_rx_rab_ass_req(map, ranap_msg, message);
 				}
 				/* If no UPF is configured, directly forward the message as-is (no GTP mapping). */
diff --git a/src/osmo-hnbgw/ps_rab_fsm.c b/src/osmo-hnbgw/ps_rab_fsm.c
index 8905540..bc85e2f 100644
--- a/src/osmo-hnbgw/ps_rab_fsm.c
+++ b/src/osmo-hnbgw/ps_rab_fsm.c
@@ -17,6 +17,8 @@
 
 #include <errno.h>
 
+#include "config.h"
+
 #include <osmocom/core/tdef.h>
 
 #include <osmocom/pfcp/pfcp_endpoint.h>
@@ -320,7 +322,11 @@
 	m->h.seid = 0;
 
 	/* Make a new CP-SEID, our local reference for the PFCP session. */
+#ifdef PFCP_PRIVATE_STRUCTS
+	rab->cp_seid = osmo_pfcp_cp_peer_next_seid(g_hnbgw->pfcp.cp_peer);
+#else
 	rab->cp_seid = osmo_pfcp_next_seid(&g_hnbgw->pfcp.cp_peer->next_seid_state);
+#endif
 	cp_f_seid = (struct osmo_pfcp_ie_f_seid){
 		.seid = rab->cp_seid,
 	};

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