osmo-sgsn: ping GGSN periodically and check for restart counter
Before this commit, echo req/rsp logic was implemented in libgtp but
never used in osmo-sgsn.
This commit adds a timer which periodically sends a GTP ECHO Request to
every GGSN if there's at least one pdpd context associated with it. This
way by checking the restart counter in the ECHO Reply it can be known if
the GGSN was restarted. In this case, logic already present in osmo-sgsn
will terminate all pdp contexts associated with that GGSN.
Change-Id: I9d714726785407859f26bbef052cd0efc28e8dae
diff --git a/include/osmocom/sgsn/gprs_sgsn.h b/include/osmocom/sgsn/gprs_sgsn.h
index 33b12dc..5f30889 100644
--- a/include/osmocom/sgsn/gprs_sgsn.h
+++ b/include/osmocom/sgsn/gprs_sgsn.h
@@ -353,6 +353,8 @@
int remote_restart_ctr;
struct gsn_t *gsn;
struct llist_head pdp_list; /* list of associated pdp ctx (struct sgsn_pdp_ctx*) */
+ struct osmo_timer_list echo_timer;
+ int echo_interval;
};
struct sgsn_ggsn_ctx *sgsn_ggsn_ctx_alloc(uint32_t id);
void sgsn_ggsn_ctx_free(struct sgsn_ggsn_ctx *ggc);
@@ -360,6 +362,8 @@
struct sgsn_ggsn_ctx *sgsn_ggsn_ctx_by_addr(struct in_addr *addr);
struct sgsn_ggsn_ctx *sgsn_ggsn_ctx_find_alloc(uint32_t id);
int sgsn_ggsn_ctx_drop_all_pdp(struct sgsn_ggsn_ctx *ggsn);
+void sgsn_ggsn_ctx_add_pdp(struct sgsn_ggsn_ctx *ggc, struct sgsn_pdp_ctx *pdp);
+void sgsn_ggsn_ctx_remove_pdp(struct sgsn_ggsn_ctx *ggc, struct sgsn_pdp_ctx *pdp);
struct apn_ctx {
struct llist_head list;
diff --git a/include/osmocom/sgsn/sgsn.h b/include/osmocom/sgsn/sgsn.h
index 829a8fc..dae9d12 100644
--- a/include/osmocom/sgsn/sgsn.h
+++ b/include/osmocom/sgsn/sgsn.h
@@ -171,6 +171,7 @@
struct tlv_parsed *tp);
int sgsn_delete_pdp_ctx(struct sgsn_pdp_ctx *pctx);
void sgsn_pdp_upd_gtp_u(struct sgsn_pdp_ctx *pdp, void *addr, size_t alen);
+void sgsn_ggsn_echo_req(struct sgsn_ggsn_ctx *ggc);
/* gprs_sndcp.c */