netd: Add enhanced routing support
Add support for policy and metric based routing APIs to netd. This
functionality is used for WQE, IMS, and Android QoS features.
Combined merge commit for following commits:
(cherry picked from Ia22847dd9611ff16eea25336716d4440461565e0)
netd: add metric support for routing
Add support for adding of cost (metric) of a route.
Changed call to ip from logwrapper to popen to handle errors caught during
a route operation.
netd: Add policy routing functionality to netd
Adding a new class RouteController to handle policy routing (source)
functionality in netd.
Installing a handler in CommandListener to handle policy routing
commands.
netd: Validate input argument for Route commands
Check for valid command line argument that is
passed to RouteController module.
CRs-fixed: 569443
RouteController: use fixed priority for ip rule
Use fixed priority when adding source policy rules
CR-fixed: 613222
Conflicts:
server/CommandListener.cpp
server/CommandListener.h
Change-Id: Ic828041d8f5be77a764ce22c45c5091ee8ae6dd2
diff --git a/server/QcRouteController.cpp b/server/QcRouteController.cpp
new file mode 100644
index 0000000..0dbb9b0
--- /dev/null
+++ b/server/QcRouteController.cpp
@@ -0,0 +1,303 @@
+/* Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ * * Neither the name of The Linux Foundation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#define LOG_NDEBUG 0
+#define LOG_NDDEBUG 0
+#define LOG_NIDEBUG 0
+
+#include <stdlib.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include <sys/types.h>
+
+#include <cutils/log.h>
+#include "QcRouteController.h"
+
+const char *TAG = "QcRouteController";
+static char IP_PATH[] = "/system/bin/ip";
+const char *QcRouteController::MAIN_TABLE = "254";
+const char *QcRouteController::SOURCE_POLICY_RULE_PRIO = "150";
+const int MAXSIZE = 256;
+
+
+QcRouteController::QcRouteController() {
+}
+
+QcRouteController::~QcRouteController() {
+}
+
+std::string QcRouteController::_runIpCmd(const char * cmd) {
+ FILE *fp = NULL;
+ char line[MAXSIZE];
+ std::string res, buffer;
+
+ if (strlen(cmd) > 255) {
+ return std::string(strerror(E2BIG));
+ }
+
+ buffer = IP_PATH;
+ buffer += " ";
+ buffer += cmd;
+ buffer += " 2>&1"; //capture stderr
+
+ ALOGV(TAG,"%s", buffer.c_str());
+
+ if ((fp = popen(buffer.c_str(),"r")) == NULL) {
+ ALOGE(TAG, "failed to popen: %s", strerror(errno));
+ res = (strerror(errno));
+ } else if (fgets(line, sizeof line, fp)) {
+ ALOGV(TAG, "%s", line);
+ res = cmd;
+ res += ": ";
+ res += line;
+ }
+ pclose(fp);
+
+ return res;
+}
+
+std::string QcRouteController::repSrcRoute
+(
+ const char *iface,
+ const char *srcPrefix,
+ const char *gateway,
+ const char *table,
+ const char *ipver
+)
+{
+ std::string res = _repDefRoute(iface, gateway, table, ipver);
+ if (res.empty()) {
+ _delRule(table, ipver);
+ res = _addRule(srcPrefix, table, ipver);
+ if (res.empty())
+ res = _flushCache();
+ }
+
+ return res;
+}
+
+std::string QcRouteController::delSrcRoute
+(
+ const char *table,
+ const char *ipver
+)
+{
+ //if iface is down then route is probably purged; ignore the error.
+ _delDefRoute(table, ipver);
+ std::string res = _delRule(table, ipver);
+ if (res.empty())
+ res = _flushCache();
+
+ return res;
+}
+
+std::string QcRouteController::addDstRoute
+(
+ const char *iface,
+ const char *dstPrefix,
+ const char *gateway,
+ const int metric,
+ const char *table
+)
+{
+ char buffer[255];
+
+ if (gateway) {
+ snprintf(buffer, sizeof buffer,
+ "route add %s via %s dev %s table %s metric %d",
+ dstPrefix, gateway, iface, table, metric);
+ } else {
+ snprintf(buffer, sizeof buffer,
+ "route add %s dev %s table %s metric %d",
+ dstPrefix, iface, table, metric);
+ }
+
+ //blindly delete an indentical route if it exists.
+ _delHostRoute(dstPrefix, table);
+
+ std::string res = _runIpCmd(buffer);
+ if (res.empty() || (res.find("exists") != std::string::npos))
+ res = _flushCache();
+
+ return res;
+}
+
+std::string QcRouteController::delDstRoute
+(
+ const char *dstPrefix,
+ const char *table
+)
+{
+ std::string res = _delHostRoute(dstPrefix, table);
+ if (res.empty())
+ res = _flushCache();
+
+ return res;
+}
+
+std::string QcRouteController::_delHostRoute
+(
+ const char *dstPrefix,
+ const char *table
+)
+{
+ char buffer[255];
+ snprintf(buffer, sizeof buffer, "route del %s table %s",
+ dstPrefix, table);
+
+ return _runIpCmd(buffer);
+}
+
+std::string QcRouteController::replaceDefRoute
+(
+ const char *iface,
+ const char *gateway,
+ const char *ipver
+)
+{
+ std::string res = _repDefRoute(iface, gateway, MAIN_TABLE, ipver);
+ if (res.empty())
+ res = _flushCache();
+
+ return res;
+}
+
+std::string QcRouteController::_repDefRoute
+(
+ const char *iface,
+ const char *gateway,
+ const char *table,
+ const char *ipver
+)
+{
+ char buffer[255];
+
+ if (gateway) {
+ snprintf(buffer, sizeof buffer,
+ "%s route replace default via %s dev %s scope global table %s",
+ ipver, gateway, iface, table);
+ } else {
+ snprintf(buffer, sizeof buffer,
+ "%s route replace default dev %s table %s",
+ ipver, iface, table);
+ }
+
+ return _runIpCmd(buffer);
+}
+
+std::string QcRouteController::_delDefRoute
+(
+ const char *table,
+ const char *ipver,
+ const char *iface
+)
+{
+ char buffer[255];
+
+ if (iface) {
+ snprintf(buffer, sizeof buffer,
+ "%s route del default dev %s table %s",
+ ipver, iface, table);
+ } else {
+ snprintf(buffer, sizeof buffer,
+ "%s route del default table %s", ipver, table);
+ }
+
+ return _runIpCmd(buffer);
+}
+
+std::string QcRouteController::addDefRoute
+(
+ const char *iface,
+ const char *gateway,
+ const char *ipver,
+ const int metric,
+ const char *table
+)
+{
+ char buffer[255];
+
+ //remove existing def route for an iface before adding one with new metric
+ _delDefRoute(table, ipver, iface);
+
+ if (gateway) {
+ snprintf(buffer, sizeof buffer,
+ "%s route add default via %s dev %s table %s metric %d",
+ ipver, gateway, iface, table, metric);
+ } else {
+ snprintf(buffer, sizeof buffer,
+ "%s route add default dev %s table %s metric %d",
+ ipver, iface, table, metric);
+ }
+
+ std::string res = _runIpCmd(buffer);
+ if (res.empty())
+ res = _flushCache();
+
+ return res;
+}
+
+std::string QcRouteController::_flushCache() {
+ char buffer[255];
+
+ snprintf(buffer, sizeof buffer, "route flush cached");
+
+ return _runIpCmd(buffer);
+}
+
+std::string QcRouteController::_addRule
+(
+ const char *address,
+ const char *table,
+ const char *ipver
+)
+{
+ char buffer[255];
+
+ snprintf(buffer, sizeof buffer,
+ "%s rule add from %s lookup %s prio %s", ipver, address, table,
+ SOURCE_POLICY_RULE_PRIO);
+
+ return _runIpCmd(buffer);
+}
+
+std::string QcRouteController::_delRule
+(
+ const char *table,
+ const char *ipver
+)
+{
+ char buffer[255];
+
+ snprintf(buffer, sizeof buffer,
+ "%s rule del table %s", ipver, table);
+
+ return _runIpCmd(buffer);
+}