Merge pull request #249 from polycube-network/jpi-attach-pr

fix polycubed crash & add a CLI to check the cubes given a interface

src/polycubed/src/extiface.cpp

@@ -32,7 +32,7 @@ const std::string PARAMETER_MAC = "MAC";
 const std::string PARAMETER_IP = "IP";
 const std::string PARAMETER_PEER = "PEER";
 
-std::set<std::string> ExtIface::used_ifaces;
+std::map<std::string, ExtIface*> ExtIface::used_ifaces;
 
 ExtIface::ExtIface(const std::string &iface)
     : PeerIface(iface_mutex_),
@@ -43,7 +43,7 @@ ExtIface::ExtIface(const std::string &iface)
     throw std::runtime_error("Iface already in use");
   }
 
-  used_ifaces.insert(iface);
+  used_ifaces.insert({iface, this});
 
   // Save the ifindex
   ifindex_iface = if_nametoindex(iface.c_str());
@@ -60,6 +60,14 @@ ExtIface::~ExtIface() {
   used_ifaces.erase(iface_);
 }
 
+ExtIface* ExtIface::get_extiface(const std::string &iface_name) {
+  if (used_ifaces.count(iface_name) == 0) {
+      return NULL;
+  }
+
+  return used_ifaces[iface_name];
+}
+
 uint16_t ExtIface::get_index() const {
   return index_;
 }
@@ -172,39 +180,82 @@ void ExtIface::set_next(uint16_t next, ProgramType type) {
   }
 }
 
+TransparentCube* ExtIface::get_next_cube(ProgramType type) {
+  auto next = get_next(type);
+  for (auto &it : cubes_) {
+      if (it->get_index(type) == next) {
+          return it;
+      }
+  }
+  return NULL;
+}
+
+uint16_t ExtIface::get_next(ProgramType type) {
+  int zero = 0;
+  unsigned int value = 0;
+  auto program = (type == ProgramType::INGRESS) ? &ingress_program_ : &egress_program_;
+  auto index_map = program->get_array_table<uint32_t>("index_map");
+  auto st = index_map.get_value(zero, value);
+  if (st.code() == -1) {
+    logger->error("failed to get interface {0} nexthop", get_iface_name());
+  }
+
+  return value & 0xffff;
+}
+
+std::vector<std::string> ExtIface::get_service_chain(ProgramType type) {
+  std::vector<std::string> chain;
+  TransparentCube *cube;
+  auto nh = get_next(type);
+
+  while (nh != 0xffff) {
+      cube = NULL;
+      for (auto c : cubes_) {
+          if (c->get_index(type) == nh) {
+              cube = c;
+              break;
+          }
+      }
+      chain.push_back(cube ? cube->get_name() : "unknown");
+      nh = cube->get_next(type);
+  }
+  chain.push_back(nh==0xffff ? "stack" : "unknown");
+
+  return chain;
+}
+
 void ExtIface::update_indexes() {
   int i;
 
   // TODO: could we avoid to recalculate in case there is not peer?
 
-  std::vector<uint16_t> ingress_indexes(cubes_.size());
-  std::vector<uint16_t> egress_indexes(cubes_.size());
+  std::vector<uint16_t> ingress_indexes(cubes_.size(), 0xffff) ;
+  std::vector<uint16_t> egress_indexes(cubes_.size(), 0xffff);
 
   for (i = 0; i < cubes_.size(); i++) {
     ingress_indexes[i] = cubes_[i]->get_index(ProgramType::INGRESS);
     egress_indexes[i] = cubes_[i]->get_index(ProgramType::EGRESS);
   }
 
-  // ingress chain: NIC -> cube[N-1] -> ... -> cube[0] -> stack (or peer)
+  // ingress chain: NIC -> cube[0] -> ... -> cube[n-1] -> stack (or peer)
   // CASE2: cube[0] -> stack (or)
-  for (i = 0; i < cubes_.size(); i++) {
-    if (ingress_indexes[i]) {
+  for (i = cubes_.size() - 1; i >= 0; i--) {
+    if (ingress_indexes[i] != 0xffff) {
       cubes_[i]->set_next(peer_ ? peer_->get_index() : 0xffff,
                           ProgramType::INGRESS);
       break;
     }
   }
 
-  // cube[N-1] -> ... -> cube[0]
-  for (int j = i + 1; j < cubes_.size(); j++) {
-    if (ingress_indexes[j]) {
+  for (int j = i - 1; j >= 0; j--) {
+    if (ingress_indexes[j] != 0xffff) {
       cubes_[j]->set_next(ingress_indexes[i], ProgramType::INGRESS);
       i = j;
     }
   }
 
   // CASE4: NIC -> cube[N-1] or peer
-  if (i < cubes_.size() && ingress_indexes[i]) {
+  if (i >= 0 && ingress_indexes[i] != 0xffff) {
     set_next(ingress_indexes[i], ProgramType::INGRESS);
   } else {
     set_next(peer_ ? peer_->get_index() : 0, ProgramType::INGRESS);
@@ -214,7 +265,7 @@ void ExtIface::update_indexes() {
 
   // cube[0] -> "egress"
   for (i = 0; i < cubes_.size(); i++) {
-    if (egress_indexes[i]) {
+    if (egress_indexes[i] != 0xffff) {
       cubes_[i]->set_next(0xffff, ProgramType::EGRESS);
       break;
     }
@@ -227,14 +278,14 @@ void ExtIface::update_indexes() {
 
   // cubes[N-1] -> ... -> cube[0]
   for (int j = i + 1; j < cubes_.size(); j++) {
-    if (egress_indexes[j]) {
+    if (egress_indexes[j] != 0xffff) {
       cubes_[j]->set_next(egress_indexes[i], ProgramType::EGRESS);
       i = j;
     }
   }
 
   // "nic" -> cubes[N-1] or peer
-  if (i < cubes_.size() && egress_indexes[i]) {
+  if (i < cubes_.size() && egress_indexes[i] != 0xffff) {
     set_next(egress_indexes[i], ProgramType::EGRESS);
   } else {
     Port *peer_port = dynamic_cast<Port *>(peer_);
@@ -243,12 +294,6 @@ void ExtIface::update_indexes() {
   }
 }
 
-// in external ifaces the cubes must be allocated in the inverse order.
-// first is the one that hits ingress traffic.
-int ExtIface::calculate_cube_index(int index) {
-  return 0 - index;
-}
-
 bool ExtIface::is_used() const {
   std::lock_guard<std::mutex> guard(iface_mutex_);
   return cubes_.size() > 0 || peer_ != nullptr;

src/polycubed/src/extiface.h

@@ -41,6 +41,13 @@ class ExtIface : public PeerIface {
   ExtIface(const ExtIface &) = delete;
   ExtIface &operator=(const ExtIface &) = delete;
 
+  /* return ExtIface pointer given interface name
+   * or return null if
+   * - either the interface name doesn't exist
+   * - or no extiface created for the interface name
+   */
+  static ExtIface* get_extiface(const std::string &iface_name);
+
   uint16_t get_index() const override;
   uint16_t get_port_id() const override;
   void set_peer_iface(PeerIface *peer) override;
@@ -59,6 +66,9 @@ class ExtIface : public PeerIface {
   std::string get_parameter(const std::string &param_name) override;
   void set_parameter(const std::string &param_name,
                      const std::string &value) override;
+  uint16_t get_next(ProgramType type);
+  TransparentCube* get_next_cube(ProgramType type);
+  std::vector<std::string> get_service_chain(ProgramType type);
 
  protected:
   // 2 maps: one for IP events and one for MAC events
@@ -71,7 +81,7 @@ class ExtIface : public PeerIface {
 
   std::mutex event_mutex;
 
-  static std::set<std::string> used_ifaces;
+  static std::map<std::string, ExtIface*> used_ifaces;
   int load_ingress();
   int load_egress();
   int load_tx();
@@ -82,7 +92,6 @@ class ExtIface : public PeerIface {
   virtual bpf_prog_type get_program_type() const = 0;
 
   void update_indexes() override;
-  int calculate_cube_index(int index) override;
 
   ebpf::BPF ingress_program_;
   ebpf::BPF egress_program_;

src/polycubed/src/peer_iface.cpp

@@ -124,6 +124,32 @@ std::vector<std::string> PeerIface::get_cubes_names() const {
   return cubes_names;
 }
 
+std::vector<uint16_t> PeerIface::get_cubes_ingress_index() const {
+  std::lock_guard<std::mutex> guard(mutex_);
+
+  std::vector<uint16_t> ingress_indices;
+
+  for (auto &cube : cubes_) {
+      ingress_indices.push_back(cube->get_index(ProgramType::INGRESS));
+  }
+
+  return ingress_indices;
+}
+
+std::vector<uint16_t> PeerIface::get_cubes_egress_index() const {
+  std::lock_guard<std::mutex> guard(mutex_);
+
+  std::vector<uint16_t> egress_indices;
+
+  for (auto &cube : cubes_) {
+      egress_indices.push_back(cube->get_index(ProgramType::EGRESS));
+  }
+
+  return egress_indices;
+}
+
+
+
 PeerIface::CubePositionComparison PeerIface::compare_position(
     const std::string &cube1, const std::string &cube2) {
   // cube position, index 0 is the innermost one
@@ -157,4 +183,4 @@ PeerIface::CubePositionComparison PeerIface::compare_position(
 }
 
 }  // namespace polycubed
-}  // namespace polycube
+}  // namespace polycube

src/polycubed/src/peer_iface.h

@@ -52,6 +52,8 @@ class PeerIface {
                const std::string &other);
   void remove_cube(const std::string &type);
   std::vector<std::string> get_cubes_names() const;
+  std::vector<uint16_t> get_cubes_ingress_index() const;
+  std::vector<uint16_t> get_cubes_egress_index() const;
 
  protected:
   enum class CubePositionComparison {

src/polycubed/src/polycubed_core.cpp

@@ -208,6 +208,44 @@ std::string PolycubedCore::topology() {
   return j.dump(4);
 }
 
+std::string PolycubedCore::get_if_topology(const std::string &if_name) {
+   json j = {{"name", if_name}};
+
+   auto extIface = polycube::polycubed::ExtIface::get_extiface(if_name);
+   if (extIface != NULL) {
+       auto names = extIface->get_cubes_names();
+       auto ingress_indices = extIface->get_cubes_ingress_index();
+       auto egress_indices = extIface->get_cubes_egress_index();
+       std::vector<std::string> cubes_info;
+       std::ostringstream stream;
+       for (int i=0; i<names.size(); i++) {
+           stream.str("");
+           stream << names[i] << ",\t" << ingress_indices[i] << ",\t" << egress_indices[i];
+           cubes_info.push_back(std::string(stream.str()));
+       }
+       j["cubes, ingress_index, egress_index"] = cubes_info;
+
+       stream.str("");
+       auto i_serv_chain = extIface->get_service_chain(ProgramType::INGRESS);
+       for (auto service : i_serv_chain) {
+           stream << service;
+           if (service != std::string("stack"))
+               stream << " ---> ";
+       }
+       j["ingress service chain"] = stream.str();
+
+       stream.str("");
+       auto e_serv_chain = extIface->get_service_chain(ProgramType::EGRESS);
+       for (auto service : e_serv_chain) {
+           stream << service;
+           if (service != std::string("stack"))
+               stream << " ---> ";
+       }
+       j["egress service chain"] = stream.str();
+   }
+   return j.dump(4);
+}
+
 std::string get_port_peer(const std::string &port) {
   std::smatch match;
   std::regex rule("(\\S+):(\\S+)");

src/polycubed/src/polycubed_core.h

@@ -64,6 +64,7 @@ class PolycubedCore {
   std::string get_netdevs();
 
   std::string topology();
+  std::string get_if_topology(const std::string &if_name);
 
   void connect(const std::string &peer1, const std::string &peer2);
   void disconnect(const std::string &peer1, const std::string &peer2);

src/polycubed/src/rest_server.cpp

@@ -271,6 +271,8 @@ void RestServer::setup_routes() {
   // topology
   router_->get(base + std::string("/topology"),
                bind(&RestServer::topology, this));
+  router_->get(base + std::string("/topology/:ifname"),
+               bind(&RestServer::get_if_topology, this));
 
   router_->options(base + std::string("/topology"),
                    bind(&RestServer::topology_help, this));
@@ -830,6 +832,19 @@ void RestServer::topology(const Pistache::Rest::Request &request,
   }
 }
 
+void RestServer::get_if_topology(const Pistache::Rest::Request &request,
+                                Pistache::Http::ResponseWriter response) {
+  logRequest(request);
+  try {
+      auto ifname = request.param(":ifname").as<std::string>();
+      std::string retJsonStr = core.get_if_topology(ifname);
+      response.send(Pistache::Http::Code::Ok, retJsonStr);
+  } catch (const std::runtime_error &e) {
+      logger->error("{0}", e.what());
+      response.send(Pistache::Http::Code::Bad_Request, e.what());
+  }
+}
+
 void RestServer::topology_help(const Pistache::Rest::Request &request,
                                Pistache::Http::ResponseWriter response) {
   json j = json::object();

src/polycubed/src/rest_server.h

@@ -122,6 +122,8 @@ class RestServer {
               Pistache::Http::ResponseWriter response);
   void topology(const Pistache::Rest::Request &request,
                 Pistache::Http::ResponseWriter response);
+  void get_if_topology(const Pistache::Rest::Request &request,
+                Pistache::Http::ResponseWriter response);
   void topology_help(const Pistache::Rest::Request &request,
                      Pistache::Http::ResponseWriter response);
 

src/polycubed/src/transparent_cube.cpp

@@ -71,6 +71,10 @@ void TransparentCube::set_next(uint16_t next, ProgramType type) {
   reload_all();
 }
 
+uint16_t TransparentCube::get_next(ProgramType type) {
+  return type == ProgramType::INGRESS ? ingress_next_ : egress_next_;
+}
+
 void TransparentCube::set_parent(PeerIface *parent) {
   parent_ = parent;
   if (parent_) {

src/polycubed/src/transparent_cube.h

@@ -36,6 +36,7 @@ class TransparentCube : public BaseCube, public TransparentCubeIface {
   virtual ~TransparentCube();
 
   void set_next(uint16_t next, ProgramType type);
+  uint16_t get_next(ProgramType type);
   void set_parent(PeerIface *parent);
   PeerIface *get_parent();
   void set_parameter(const std::string &parameter, const std::string &value);