path: root/openbsc/src/gprs/sgsn_vty.c
diff options
authorHolger Hans Peter Freyther <>2015-05-25 12:26:49 +0800
committerHolger Hans Peter Freyther <>2015-05-25 15:57:57 +0800
commit39c430ee2929f0671203974db11dfdd4ff4841cb (patch)
treef7fedeadef2803179a16e187589f5647917279cf /openbsc/src/gprs/sgsn_vty.c
parent66e7106d393368b2dd0d04c08f31781ed997380b (diff)
sgsn: Allow to resolve the IPv4 address of a GGSN through DNS
For real networks we need to check if the requested APN string is allowed and then resolve the GGSN address through DNS. There are countries with two or three digit MNCs and one could either try to keep a list of countries that have two/three digits or just try both of them. I have opted for the later for the ease of the implementation. C-Ares doesn't allow to cancel a request so we will need to have the MMCTX and the Lookup have different lifetimes. We simply set ->mmctx to NULL in case the MMCTX dies more early. The selected and verified apn_str will be copied into the out parameter. In case no static APN/GGSN config is present and the dynamic mode is enabled a request will be made.
Diffstat (limited to 'openbsc/src/gprs/sgsn_vty.c')
1 files changed, 15 insertions, 0 deletions
diff --git a/openbsc/src/gprs/sgsn_vty.c b/openbsc/src/gprs/sgsn_vty.c
index b7023adb2..65b5a39e1 100644
--- a/openbsc/src/gprs/sgsn_vty.c
+++ b/openbsc/src/gprs/sgsn_vty.c
@@ -135,12 +135,18 @@ static int config_write_sgsn(struct vty *vty)
inet_ntoa(g_cfg->gtp_listenaddr.sin_addr), VTY_NEWLINE);
llist_for_each_entry(gctx, &sgsn_ggsn_ctxts, list) {
+ if (gctx->id == UINT32_MAX)
+ continue;
vty_out(vty, " ggsn %u remote-ip %s%s", gctx->id,
inet_ntoa(gctx->remote_addr), VTY_NEWLINE);
vty_out(vty, " ggsn %u gtp-version %u%s", gctx->id,
gctx->gtp_version, VTY_NEWLINE);
+ if (sgsn->cfg.dynamic_lookup)
+ vty_out(vty, " ggsn dynamic%s", VTY_NEWLINE);
vty_out(vty, " auth-policy %s%s",
get_value_string(sgsn_auth_pol_strs, g_cfg->auth_policy),
@@ -236,6 +242,14 @@ DEFUN(cfg_ggsn_gtp_version, cfg_ggsn_gtp_version_cmd,
+DEFUN(cfg_ggsn_dynamic_lookup, cfg_ggsn_dynamic_lookup_cmd,
+ "ggsn dynamic",
+ GGSN_STR "Enable dynamic GRX based look-up (requires restart)\n")
+ sgsn->cfg.dynamic_lookup = 1;
+ return CMD_SUCCESS;
#define APN_STR "Configure the information per APN\n"
#define APN_GW_STR "The APN gateway name optionally prefixed by '*' (wildcard)\n"
@@ -878,6 +892,7 @@ int sgsn_vty_init(void)
install_element(SGSN_NODE, &cfg_cdr_filename_cmd);
install_element(SGSN_NODE, &cfg_no_cdr_filename_cmd);
install_element(SGSN_NODE, &cfg_cdr_interval_cmd);
+ install_element(SGSN_NODE, &cfg_ggsn_dynamic_lookup_cmd);
return 0;