[PATCH 3/4] stemodem: Update gprs-context to use rtnl

[Sjur =?unknown-8bit?q?Br=C3=A6ndeland?= <sjurbren@gmail.com>]

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From: Sjur Brændeland <sjur.brandeland@stericsson.com>

RTNL is now used to create and remove CAIF network interfaces.
The created CAIF interface is assigned a channel-id which is
used as parameter in the AT*EPPSD command used to activate the
PDP-Context.

The CAIF Network interfaces are created when gprs-context is probed
initially.

Some refactoring and bug-fixes are also included.

---
 drivers/stemodem/gprs-context.c |  210 +++++++++++++++++++++++++-------------
 1 files changed, 138 insertions(+), 72 deletions(-)

diff --git a/drivers/stemodem/gprs-context.c b/drivers/stemodem/gprs-context.c
index d3a50a9..7e956d3 100644
--- a/drivers/stemodem/gprs-context.c
+++ b/drivers/stemodem/gprs-context.c
@@ -28,6 +28,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <errno.h>
 
 #include <glib.h>
 
@@ -46,10 +47,11 @@
 #include "stemodem.h"
 #include "caif_socket.h"
 #include "if_caif.h"
+#include "rtnl.h"
 
-#define MAX_CAIF_DEVICES 7
+#define MAX_CAIF_DEVICES 4
 #define MAX_DNS 2
-#define MAX_ELEM 20
+#define IP_ADDR_LEN 20
 
 #define AUTH_BUF_LENGTH (OFONO_GPRS_MAX_USERNAME_LENGTH + \
 			OFONO_GPRS_MAX_PASSWORD_LENGTH + 128)
@@ -65,21 +67,29 @@ struct gprs_context_data {
 };
 
 struct conn_info {
+	/*
+	 * cid is allocated in oFono Core and is identifying
+	 * the Account. cid = 0 indicates that it is currently unused.
+	 */
 	unsigned int cid;
-	unsigned int device;
+	/* Id used by CAIF and EPPSD to identify the CAIF channel*/
 	unsigned int channel_id;
-	char interface[10];
+	/* Linux Interface Id */
+	unsigned int ifindex;
+	/* Linux Interface name */
+	char interface[IF_NAMESIZE];
+	gboolean created;
 };
 
 struct eppsd_response {
 	char *current;
-	char ip_address[MAX_ELEM];
-	char subnet_mask[MAX_ELEM];
-	char mtu[MAX_ELEM];
-	char default_gateway[MAX_ELEM];
-	char dns_server1[MAX_ELEM];
-	char dns_server2[MAX_ELEM];
-	char p_cscf_server[MAX_ELEM];
+	char ip_address[IP_ADDR_LEN];
+	char subnet_mask[IP_ADDR_LEN];
+	char mtu[IP_ADDR_LEN];
+	char default_gateway[IP_ADDR_LEN];
+	char dns_server1[IP_ADDR_LEN];
+	char dns_server2[IP_ADDR_LEN];
+	char p_cscf_server[IP_ADDR_LEN];
 };
 
 static void start_element_handler(GMarkupParseContext *context,
@@ -122,8 +132,8 @@ static void text_handler(GMarkupParseContext *context,
 	struct eppsd_response *rsp = user_data;
 
 	if (rsp->current) {
-		strncpy(rsp->current, text, MAX_ELEM);
-		rsp->current[MAX_ELEM] = 0;
+		strncpy(rsp->current, text, IP_ADDR_LEN);
+		rsp->current[IP_ADDR_LEN] = 0;
 	}
 }
 
@@ -153,8 +163,7 @@ static gint conn_compare_by_cid(gconstpointer a, gconstpointer b)
 	return 0;
 }
 
-static struct conn_info *conn_info_create(unsigned int device,
-						unsigned int channel_id)
+static struct conn_info *conn_info_create(unsigned int channel_id)
 {
 	struct conn_info *connection = g_try_new0(struct conn_info, 1);
 
@@ -162,26 +171,64 @@ static struct conn_info *conn_info_create(unsigned int device,
 		return NULL;
 
 	connection->cid = 0;
-	connection->device = device;
 	connection->channel_id = channel_id;
 
 	return connection;
 }
 
+static void rtnl_callback(struct rtnl_rsp_param *param)
+{
+	struct conn_info *conn = param->user_data;
+
+	strncpy(conn->interface, param->ifname, sizeof(conn->interface));
+	conn->ifindex = param->ifindex;
+
+	if (param->result == 0)
+		conn->created = TRUE;
+	else {
+		conn->created = FALSE;
+		DBG("Could not create CAIF Interface");
+	}
+}
+
 /*
  * Creates a new IP interface for CAIF.
  */
-static gboolean caif_if_create(const char *interface, unsigned int connid)
+static gboolean caif_if_create(struct conn_info *conn)
 {
-	return FALSE;
+	struct rtnl_req_param req_param = {
+		.type = IFLA_CAIF_IPV4_CONNID,
+		.conn_id = conn->channel_id,
+		.user_data = conn,
+		.callback = rtnl_callback,
+		.loop_enabled = FALSE
+	};
+
+	if (rtnl_create_caif_interface(&req_param) < 0) {
+		DBG("Failed to create IP interface for CAIF");
+		return FALSE;
+	}
+
+	return TRUE;
 }
 
 /*
  * Removes IP interface for CAIF.
  */
-static gboolean caif_if_remove(const char *interface, unsigned int connid)
+static void caif_if_remove(struct conn_info *conn)
 {
-	return FALSE;
+	if (!conn->created)
+		return;
+
+	if (rtnl_delete_caif_interface(conn->ifindex) < 0) {
+		ofono_error("Failed to delete caif interface %s",
+			conn->interface);
+		return;
+	}
+
+	DBG("removed CAIF interface ch:%d ifname:%s ifindex:%d\n",
+		conn->channel_id, conn->interface, conn->ifindex);
+	return;
 }
 
 static void ste_eppsd_down_cb(gboolean ok, GAtResult *result,
@@ -192,11 +239,14 @@ static void ste_eppsd_down_cb(gboolean ok, GAtResult *result,
 	struct ofono_gprs_context *gc = cbd->user;
 	struct gprs_context_data *gcd = ofono_gprs_context_get_data(gc);
 	struct ofono_error error;
-	struct conn_info *conn;
+	struct conn_info *conn = NULL;
 	GSList *l;
 
-	if (!ok)
-		goto error;
+	if (!ok) {
+		decode_at_error(&error, g_at_result_final_response(result));
+		cb(&error, cbd->data);
+		return;
+	}
 
 	l = g_slist_find_custom(g_caif_devices,
 				GUINT_TO_POINTER(gcd->active_context),
@@ -210,16 +260,8 @@ static void ste_eppsd_down_cb(gboolean ok, GAtResult *result,
 	}
 
 	conn = l->data;
-
-	if (!caif_if_remove(conn->interface, conn->channel_id)) {
-		DBG("Failed to remove caif interface %s.",
-				conn->interface);
-	}
-
 	conn->cid = 0;
-
-	decode_at_error(&error, g_at_result_final_response(result));
-	cb(&error, cbd->data);
+	CALLBACK_WITH_SUCCESS(cb, cbd->data);
 	return;
 
 error:
@@ -237,26 +279,30 @@ static void ste_eppsd_up_cb(gboolean ok, GAtResult *result, gpointer user_data)
 	GSList *l;
 	int i;
 	gsize length;
-	char *res_string;
+	const char *res_string;
 	const char *dns[MAX_DNS + 1];
 	struct eppsd_response rsp;
 	GMarkupParseContext *context = NULL;
+	struct ofono_error error;
 
 	l = g_slist_find_custom(g_caif_devices,
 				GUINT_TO_POINTER(gcd->active_context),
 				conn_compare_by_cid);
 
 	if (!l) {
-		DBG("Did not find data (device and channel id)"
-					"for connection with cid; %d",
-					gcd->active_context);
+		DBG("CAIF Device gone missing (cid:%d)", gcd->active_context);
 		goto error;
 	}
 
 	conn = l->data;
 
-	if (!ok)
-		goto error;
+	if (!ok) {
+		conn->cid = 0;
+		gcd->active_context = 0;
+		decode_at_error(&error, g_at_result_final_response(result));
+		cb(&error, NULL, 0, NULL, NULL, NULL, NULL, cbd->data);
+		return;
+	}
 
 	rsp.current = NULL;
 	context = g_markup_parse_context_new(&parser, 0, &rsp, NULL);
@@ -266,7 +312,7 @@ static void ste_eppsd_up_cb(gboolean ok, GAtResult *result, gpointer user_data)
 
 	for (i = 0; i < g_at_result_num_response_lines(result); i++) {
 		g_at_result_iter_next(&iter, NULL);
-		res_string = strdup(g_at_result_iter_raw_line(&iter));
+		res_string = g_at_result_iter_raw_line(&iter);
 		length = strlen(res_string);
 
 		if (!g_markup_parse_context_parse(context, res_string,
@@ -283,20 +329,9 @@ static void ste_eppsd_up_cb(gboolean ok, GAtResult *result, gpointer user_data)
 	dns[1] = rsp.dns_server2;
 	dns[2] = NULL;
 
-	sprintf(conn->interface, "caif%u", conn->device);
-
-	if (!caif_if_create(conn->interface, conn->channel_id)) {
-		ofono_error("Failed to create caif interface %s.",
-				conn->interface);
-		CALLBACK_WITH_SUCCESS(cb, NULL, FALSE, rsp.ip_address,
+	CALLBACK_WITH_SUCCESS(cb, conn->interface, TRUE, rsp.ip_address,
 				rsp.subnet_mask, rsp.default_gateway,
 				dns, cbd->data);
-	} else {
-		CALLBACK_WITH_SUCCESS(cb, conn->interface,
-				FALSE, rsp.ip_address, rsp.subnet_mask,
-				rsp.default_gateway, dns, cbd->data);
-	}
-
 	return;
 
 error:
@@ -308,6 +343,7 @@ error:
 	if (conn)
 		conn->cid = 0;
 
+	gcd->active_context = 0;
 	CALLBACK_WITH_FAILURE(cb, NULL, 0, NULL, NULL, NULL, NULL, cbd->data);
 }
 
@@ -319,12 +355,23 @@ static void ste_cgdcont_cb(gboolean ok, GAtResult *result, gpointer user_data)
 	struct gprs_context_data *gcd = ofono_gprs_context_get_data(gc);
 	struct cb_data *ncbd = NULL;
 	char buf[128];
-	struct conn_info *conn;
+	struct conn_info *conn = NULL;
 	GSList *l;
 
+	l = g_slist_find_custom(g_caif_devices,
+				GUINT_TO_POINTER(gcd->active_context),
+				conn_compare_by_cid);
+
+	if (!l) {
+		DBG("CAIF Device gone missing (cid:%d)", gcd->active_context);
+		goto error;
+	}
+
+	conn = l->data;
+
 	if (!ok) {
 		struct ofono_error error;
-
+		conn->cid = 0;
 		gcd->active_context = 0;
 
 		decode_at_error(&error, g_at_result_final_response(result));
@@ -332,26 +379,18 @@ static void ste_cgdcont_cb(gboolean ok, GAtResult *result, gpointer user_data)
 		return;
 	}
 
-	ncbd = g_memdup(cbd, sizeof(struct cb_data));
-
-	l = g_slist_find_custom(g_caif_devices, GUINT_TO_POINTER(0),
-				conn_compare_by_cid);
-
-	if (!l) {
-		DBG("at_cgdcont_cb, no more available devices");
-		goto error;
-	}
-
-	conn = l->data;
-	conn->cid = gcd->active_context;
 	snprintf(buf, sizeof(buf), "AT*EPPSD=1,%u,%u",
 			conn->channel_id, conn->cid);
+	ncbd = g_memdup(cbd, sizeof(struct cb_data));
 
 	if (g_at_chat_send(gcd->chat, buf, NULL,
 				ste_eppsd_up_cb, ncbd, g_free) > 0)
 		return;
 
 error:
+	if (conn)
+		conn->cid = 0;
+
 	g_free(ncbd);
 
 	gcd->active_context = 0;
@@ -368,6 +407,8 @@ static void ste_gprs_activate_primary(struct ofono_gprs_context *gc,
 	struct cb_data *cbd = cb_data_new(cb, data);
 	char buf[AUTH_BUF_LENGTH];
 	int len;
+	GSList *l;
+	struct conn_info *conn = NULL;
 
 	if (!cbd)
 		goto error;
@@ -375,6 +416,23 @@ static void ste_gprs_activate_primary(struct ofono_gprs_context *gc,
 	gcd->active_context = ctx->cid;
 	cbd->user = gc;
 
+	/* Find free connection with cid zero */
+	l = g_slist_find_custom(g_caif_devices, GUINT_TO_POINTER(0),
+				conn_compare_by_cid);
+
+	if (!l) {
+		DBG("No more available CAIF devices");
+		goto error;
+	}
+
+	conn = l->data;
+	if (!conn->created) {
+		DBG("CAIF interface not created (rtnl error?)");
+		goto error;
+	}
+
+	conn->cid = ctx->cid;
+
 	len = snprintf(buf, sizeof(buf), "AT+CGDCONT=%u,\"IP\"", ctx->cid);
 
 	if (ctx->apn)
@@ -389,7 +447,7 @@ static void ste_gprs_activate_primary(struct ofono_gprs_context *gc,
 	 * Set username and password, this should be done after CGDCONT
 	 * or an error can occur.  We don't bother with error checking
 	 * here
-	 * */
+	 */
 	snprintf(buf, sizeof(buf), "AT*EIAAUW=%d,1,\"%s\",\"%s\"",
 			ctx->cid, ctx->username, ctx->password);
 
@@ -398,6 +456,10 @@ static void ste_gprs_activate_primary(struct ofono_gprs_context *gc,
 	return;
 
 error:
+	if (conn)
+		conn->cid = 0;
+
+	gcd->active_context = 0;
 	g_free(cbd);
 
 	CALLBACK_WITH_FAILURE(cb, NULL, 0, NULL, NULL, NULL, NULL, data);
@@ -423,8 +485,8 @@ static void ste_gprs_deactivate_primary(struct ofono_gprs_context *gc,
 				conn_compare_by_cid);
 
 	if (!l) {
-		DBG("at_gprs_deactivate_primary, did not find"
-			"data (channel id) for connection with cid; %d", id);
+		DBG("did not find data (channel id) "
+				"for connection with cid; %d", id);
 		goto error;
 	}
 
@@ -516,9 +578,11 @@ static int ste_gprs_context_probe(struct ofono_gprs_context *gc,
 	ofono_gprs_context_set_data(gc, gcd);
 
 	for (i = 0; i < MAX_CAIF_DEVICES; i++) {
-		ci = conn_info_create(i, i+1);
-		if (ci)
-			g_caif_devices = g_slist_append(g_caif_devices, ci);
+		ci = conn_info_create(i+1);
+		if (!ci)
+			return -ENOMEM;
+		caif_if_create(ci);
+		g_caif_devices = g_slist_append(g_caif_devices, ci);
 	}
 
 	return 0;
@@ -527,7 +591,7 @@ static int ste_gprs_context_probe(struct ofono_gprs_context *gc,
 static void ste_gprs_context_remove(struct ofono_gprs_context *gc)
 {
 	struct gprs_context_data *gcd = ofono_gprs_context_get_data(gc);
-
+	g_slist_foreach(g_caif_devices, (GFunc) caif_if_remove, NULL);
 	g_slist_foreach(g_caif_devices, (GFunc) g_free, NULL);
 	g_slist_free(g_caif_devices);
 	g_caif_devices = NULL;
@@ -548,10 +612,12 @@ static struct ofono_gprs_context_driver driver = {
 
 void ste_gprs_context_init()
 {
+	rtnl_init();
 	ofono_gprs_context_driver_register(&driver);
 }
 
 void ste_gprs_context_exit()
 {
+	rtnl_exit();
 	ofono_gprs_context_driver_unregister(&driver);
 }
-- 
1.6.3.3