Introduce a VTY, factually turning OpenGGSN into an Osmocom program

Change-Id: I9613ca3436e77ea132c47f0096df7c5050d7e826

1 files changed, 133 insertions, 0 deletions

diff --git a/ggsn/ggsn.h b/ggsn/ggsn.h
new file mode 100644
index 0000000..bab6cf7
--- /dev/null
+++ b/ggsn/ggsn.h
@@ -0,0 +1,133 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/linuxlist.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/timer.h>
+
+#include "../lib/tun.h"
+#include "../lib/ippool.h"
+#include "../lib/syserr.h"
+#include "../lib/in46_addr.h"
+#include "../gtp/gtp.h"
+
+#define APN_TYPE_IPv4	0x01	/* v4-only */
+#define APN_TYPE_IPv6	0x02	/* v6-only */
+#define APN_TYPE_IPv4v6	0x04	/* v4v6 dual-stack */
+
+struct ggsn_ctx;
+
+struct apn_ctx_ip {
+	struct {
+		struct in46_prefix ifconfig_prefix;
+		struct in46_prefix static_prefix;
+		struct in46_prefix dynamic_prefix;
+		/* v4 DNS server names */
+		struct in46_addr dns[2];
+	} cfg;
+
+	/* v4 address pool */
+	struct ippool_t *pool;
+};
+
+struct apn_name {
+	struct llist_head list;
+	char *name;
+};
+
+enum apn_gtpu_mode {
+	APN_GTPU_MODE_TUN = 0,		/* default */
+	APN_GTPU_MODE_KERNEL_GTP,
+};
+
+struct apn_ctx {
+	/* list of APNs inside GGSN */
+	struct llist_head list;
+	/* back-pointer to GGSN */
+	struct ggsn_ctx *ggsn;
+
+	bool started;
+
+	struct {
+		/* Primary name */
+		char *name;
+		/* Description string */
+		char *description;
+		/* List of secondary APN names */
+		struct llist_head name_list;
+		/* types supported address types on this APN */
+		uint32_t apn_type_mask;
+		/* GTP-U via TUN device or in Linux kernel */
+		enum apn_gtpu_mode gtpu_mode;
+		/* administratively shut-down (true) or not (false) */
+		bool shutdown;
+	} cfg;
+
+	/* corresponding tun device */
+	struct {
+		struct {
+			/* name of the network device */
+			char *dev_name;
+			/* ip-up and ip-down script names/paths */
+			char *ipup_script;
+			char *ipdown_script;
+		} cfg;
+		struct tun_t *tun;
+		struct osmo_fd fd;
+	} tun;
+
+	struct apn_ctx_ip v4;
+	struct apn_ctx_ip v6;
+};
+
+struct ggsn_ctx {
+	/* global list of GGSNs */
+	struct llist_head list;
+
+	/* list of APNs in this GGSN */
+	struct llist_head apn_list;
+
+	bool started;
+
+	struct {
+		char *name;
+		/* Description string */
+		char *description;
+		/* an APN that shall be used as default for any non-matching APN */
+		struct apn_ctx *default_apn;
+		/* ADdress to which we listen for GTP */
+		struct in46_addr listen_addr;
+		/* directory for state file */
+		char *state_dir;
+		/* administratively shut-down (true) or not (false) */
+		bool shutdown;
+	} cfg;
+
+	/* The libgtp (G)GSN instance, i.e. what listens to GTP */
+	struct gsn_t *gsn;
+
+	/* osmo-fd for gsn */
+	struct osmo_fd gtp_fd0;
+	struct osmo_fd gtp_fd1c;
+	struct osmo_fd gtp_fd1u;
+
+	struct osmo_timer_list gtp_timer;
+};
+
+/* ggsn_vty.c */
+extern struct llist_head g_ggsn_list;
+extern struct vty_app_info g_vty_info;
+extern int ggsn_vty_init(void);
+struct ggsn_ctx *ggsn_find(const char *name);
+struct ggsn_ctx *ggsn_find_or_create(void *ctx, const char *name);
+struct apn_ctx *ggsn_find_apn(struct ggsn_ctx *ggsn, const char *name);
+struct apn_ctx *ggsn_find_or_create_apn(struct ggsn_ctx *ggsn, const char *name);
+
+/* ggsn.c */
+extern void *tall_ggsn_ctx;
+extern int ggsn_start(struct ggsn_ctx *ggsn);
+extern int ggsn_stop(struct ggsn_ctx *ggsn);
+extern int apn_start(struct apn_ctx *apn);
+extern int apn_stop(struct apn_ctx *apn, bool force);