add struct gtp_tunnel and adapt functions to use it

This patch adds a gtp_tunnel structure to avoid having to deal with
functions with lots of parameters. This should also help to extend
the interfaces and the gtp_tunnel object without breaking the binary
interface (which will be good by when ipv6 support will be added).

libgtnl/include/libgtpnl/Makefile.am

@@ -1 +1 @@
-pkginclude_HEADERS = gtpnl.h
+pkginclude_HEADERS = gtp.h gtpnl.h

libgtnl/include/libgtpnl/gtp.h

@@ -0,0 +1,23 @@
+#ifndef _LIBGTP_H_
+#define _LIBGTP_H_
+
+#include <stdint.h>
+
+struct gtp_tunnel;
+
+struct gtp_tunnel *gtp_tunnel_alloc(void);
+void gtp_tunnel_free(struct gtp_tunnel *t);
+
+void gtp_tunnel_set_ifidx(struct gtp_tunnel *t, uint32_t ifidx);
+void gtp_tunnel_set_ms_ip4(struct gtp_tunnel *t, struct in_addr *ms_addr);
+void gtp_tunnel_set_sgsn_ip4(struct gtp_tunnel *t, struct in_addr *sgsn_addr);
+void gtp_tunnel_set_version(struct gtp_tunnel *t, uint32_t version);
+void gtp_tunnel_set_tid(struct gtp_tunnel *t, uint64_t tid);
+
+const uint32_t gtp_tunnel_get_ifidx(struct gtp_tunnel *t);
+const struct in_addr *gtp_tunnel_get_ms_ip4(struct gtp_tunnel *t);
+const struct in_addr *gtp_tunnel_get_sgsn_ip4(struct gtp_tunnel *t);
+int gtp_tunnel_get_version(struct gtp_tunnel *t);
+uint64_t gtp_tunnel_get_tid(struct gtp_tunnel *t);
+
+#endif

libgtnl/include/libgtpnl/gtpnl.h

@@ -16,11 +16,10 @@ int genl_lookup_family(struct mnl_socket *nl, const char *family);
 
 int gtp_dev_create(const char *ifname);
 
-int gtp_add_tunnel(int genl_id, struct mnl_socket *nl, const char *ifname,
-		   const char *ms_addr, const char *sgsn_addr, uint64_t tid,
-		   int gtp_version);
-int gtp_del_tunnel(int genl_id, struct mnl_socket *nl, const char *ifname,
-		   uint64_t tid, uint32_t gtp_version);
+struct gtp_tunnel;
+
+int gtp_add_tunnel(int genl_id, struct mnl_socket *nl, struct gtp_tunnel *t);
+int gtp_del_tunnel(int genl_id, struct mnl_socket *nl, struct gtp_tunnel *t);
 int gtp_list_tunnel(int genl_id, struct mnl_socket *nl);
 
 #endif

libgtnl/src/Makefile.am

@@ -2,4 +2,8 @@ include $(top_srcdir)/Make_global.am
 lib_LTLIBRARIES = libgtpnl.la
 
 libgtpnl_la_LDFLAGS = -Wl,--version-script=$(srcdir)/libgtpnl.map -version-info $(LIBVERSION)
-libgtpnl_la_SOURCES = genl.c gtp-genl.c gtp-rtnl.c libgtpnl.map
+libgtpnl_la_SOURCES = genl.c		\
+		      gtp-genl.c	\
+		      gtp-rtnl.c	\
+		      gtp.c		\
+		      libgtpnl.map

libgtnl/src/gtp-genl.c

@@ -11,6 +11,7 @@
 #include <libmnl/libmnl.h>
 #include <linux/genetlink.h>
 
+#include <libgtpnl/gtp.h>
 #include <libgtpnl/gtpnl.h>
 
 #include <net/if.h>
@@ -29,42 +30,22 @@ static void gtp_build_payload(struct nlmsghdr *nlh, uint64_t tid,
 	mnl_attr_put_u64(nlh, GTPA_TID, tid);
 }
 
-int gtp_add_tunnel(int genl_id, struct mnl_socket *nl, const char *ifname,
-		   const char *ms_addr, const char *sgsn_addr, uint64_t tid,
-		   int gtp_version)
+int gtp_add_tunnel(int genl_id, struct mnl_socket *nl, struct gtp_tunnel *t)
 {
-	uint32_t gtp_ifidx;
-	struct in_addr ms, sgsn;
 	struct nlmsghdr *nlh;
 	char buf[MNL_SOCKET_BUFFER_SIZE];
 	uint32_t seq = time(NULL);
 
-	gtp_ifidx = if_nametoindex(ifname);
-	if (gtp_ifidx == 0){
-		fprintf(stderr, "wrong GTP interface %s\n", ifname);
-		return -1;
-	}
-
-	if (inet_aton(ms_addr, &ms) < 0) {
-		perror("bad address for ms");
-		return -1;
-	}
-
-	if (inet_aton(sgsn_addr, &sgsn) < 0) {
-		perror("bad address for sgsn");
-		return -1;
-	}
-
-	if (gtp_version > GTP_V1) {
+	if (t->gtp_version > GTP_V1) {
 		fprintf(stderr, "wrong GTP version %u, use v0 or v1\n",
-			gtp_version);
+			t->gtp_version);
 		return -1;
 	}
 
 	nlh = genl_nlmsg_build_hdr(buf, genl_id, NLM_F_EXCL | NLM_F_ACK, ++seq,
 				   GTP_CMD_TUNNEL_NEW);
-	gtp_build_payload(nlh, tid, gtp_ifidx, sgsn.s_addr,
-			  ms.s_addr, gtp_version);
+	gtp_build_payload(nlh, t->tid, t->ifidx, t->sgsn_addr.s_addr,
+			  t->ms_addr.s_addr, t->gtp_version);
 
 	if (genl_socket_talk(nl, nlh, seq, NULL, NULL) < 0)
 		perror("genl_socket_talk");
@@ -73,19 +54,15 @@ int gtp_add_tunnel(int genl_id, struct mnl_socket *nl, const char *ifname,
 }
 EXPORT_SYMBOL(gtp_add_tunnel);
 
-int gtp_del_tunnel(int genl_id, struct mnl_socket *nl, const char *ifname,
-		   uint64_t tid, uint32_t gtp_version)
+int gtp_del_tunnel(int genl_id, struct mnl_socket *nl, struct gtp_tunnel *t)
 {
-	uint32_t gtp_ifidx;
 	char buf[MNL_SOCKET_BUFFER_SIZE];
 	struct nlmsghdr *nlh;
 	uint32_t seq = time(NULL);
 
-	gtp_ifidx = if_nametoindex(ifname);
-
 	nlh = genl_nlmsg_build_hdr(buf, genl_id, NLM_F_ACK, ++seq,
 				   GTP_CMD_TUNNEL_DELETE);
-	gtp_build_payload(nlh, tid, gtp_ifidx, 0, 0, gtp_version);
+	gtp_build_payload(nlh, t->tid, t->ifidx, 0, 0, t->gtp_version);
 
 	if (genl_socket_talk(nl, nlh, seq, NULL, NULL) < 0)
 		perror("genl_socket_talk");

libgtnl/src/gtp.c

@@ -0,0 +1,78 @@
+#include <stdlib.h>
+#include <netinet/in.h>
+
+#include <libgtpnl/gtp.h>
+
+#include "internal.h"
+
+struct gtp_tunnel *gtp_tunnel_alloc(void)
+{
+	return calloc(1, sizeof(struct gtp_tunnel));
+}
+EXPORT_SYMBOL(gtp_tunnel_alloc);
+
+void gtp_tunnel_free(struct gtp_tunnel *t)
+{
+	free(t);
+}
+EXPORT_SYMBOL(gtp_tunnel_free);
+
+void gtp_tunnel_set_ifidx(struct gtp_tunnel *t, uint32_t ifidx)
+{
+	t->ifidx = ifidx;
+}
+EXPORT_SYMBOL(gtp_tunnel_set_ifidx);
+
+void gtp_tunnel_set_ms_ip4(struct gtp_tunnel *t, struct in_addr *ms_addr)
+{
+	t->ms_addr = *ms_addr;
+}
+EXPORT_SYMBOL(gtp_tunnel_set_ms_ip4);
+
+void gtp_tunnel_set_sgsn_ip4(struct gtp_tunnel *t, struct in_addr *sgsn_addr)
+{
+	t->sgsn_addr = *sgsn_addr;
+}
+EXPORT_SYMBOL(gtp_tunnel_set_sgsn_ip4);
+
+void gtp_tunnel_set_version(struct gtp_tunnel *t, uint32_t version)
+{
+	t->gtp_version = version;
+}
+EXPORT_SYMBOL(gtp_tunnel_set_version);
+
+void gtp_tunnel_set_tid(struct gtp_tunnel *t, uint64_t tid)
+{
+	t->tid = tid;
+}
+EXPORT_SYMBOL(gtp_tunnel_set_tid);
+
+const uint32_t gtp_tunnel_get_ifidx(struct gtp_tunnel *t)
+{
+	return t->ifidx;
+}
+EXPORT_SYMBOL(gtp_tunnel_get_ifidx);
+
+const struct in_addr *gtp_tunnel_get_ms_ip4(struct gtp_tunnel *t)
+{
+	return &t->ms_addr;
+}
+EXPORT_SYMBOL(gtp_tunnel_get_ms_ip4);
+
+const struct in_addr *gtp_tunnel_get_sgsn_ip4(struct gtp_tunnel *t)
+{
+	return &t->sgsn_addr;
+}
+EXPORT_SYMBOL(gtp_tunnel_get_sgsn_ip4);
+
+int gtp_tunnel_get_version(struct gtp_tunnel *t)
+{
+	return t->gtp_version;
+}
+EXPORT_SYMBOL(gtp_tunnel_get_version);
+
+uint64_t gtp_tunnel_get_tid(struct gtp_tunnel *t)
+{
+	return t->tid;
+}
+EXPORT_SYMBOL(gtp_tunnel_get_tid);

libgtnl/src/internal.h

@@ -9,4 +9,15 @@
 #	define EXPORT_SYMBOL
 #endif
 
+#include <stdint.h>
+#include <netinet/in.h>
+
+struct gtp_tunnel {
+	uint32_t	ifidx;
+	struct in_addr	ms_addr;
+	struct in_addr	sgsn_addr;
+	uint64_t	tid;
+	int		gtp_version;
+};
+
 #endif

libgtnl/src/libgtpnl.map

@@ -9,5 +9,18 @@ global:
   gtp_del_tunnel;
   gtp_list_tunnel;
 
+  gtp_tunnel_alloc;
+  gtp_tunnel_free;
+  gtp_tunnel_set_ifidx;
+  gtp_tunnel_set_ms_ip4;
+  gtp_tunnel_set_sgsn_ip4;
+  gtp_tunnel_set_version;
+  gtp_tunnel_set_tid;
+  gtp_tunnel_get_ifidx;
+  gtp_tunnel_get_ms_ip4;
+  gtp_tunnel_get_sgsn_ip4;
+  gtp_tunnel_get_version;
+  gtp_tunnel_get_tid;
+
 local: *;
 };