/* *------------------------------------------------------------------ * Copyright (c) 2020 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *------------------------------------------------------------------ */ #include #include #include #include #include #include #include #include #include #include #include #define APP_NAME "icmp_responder_example" #define IF_NAME "libmemif0" #define IF_ID 0 #define SOCKET_PATH "/run/vpp/memif.sock" const uint8_t HW_ADDR[6] = { 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa }; const uint8_t IP_ADDR[4] = { 192, 168, 1, 1 }; memif_connection_t intf; int epfd; /* informs user about connected status. private_ctx is used by user to identify * connection */ int on_connect (memif_conn_handle_t conn, void *private_ctx) { INFO ("memif connected!"); int err; memif_connection_t *c = (memif_connection_t *) private_ctx; c->is_connected = 1; alloc_memif_buffers (c); err = memif_refill_queue (conn, 0, -1, 0); if (err != MEMIF_ERR_SUCCESS) { INFO ("memif_refill_queue: %s", memif_strerror (err)); return err; } return 0; } /* informs user about disconnected status. private_ctx is used by user to * identify connection */ int on_disconnect (memif_conn_handle_t conn, void *private_ctx) { INFO ("memif disconnected!"); memif_connection_t *c = (memif_connection_t *) private_ctx; c->is_connected = 0; free_memif_buffers (c); /* stop event polling thread */ int err = memif_cancel_poll_event (memif_get_socket_handle (conn)); if (err != MEMIF_ERR_SUCCESS) INFO ("We are doomed..."); return 0; } void print_help () { printf ("LIBMEMIF EXAMPLE APP: %s", APP_NAME); #ifdef ICMP_DBG printf (" (debug)"); #endif printf ("\n"); printf ("==============================\n"); print_version (); printf ("==============================\n"); printf ( "In this example, memif endpoint connects to an external application.\n"); printf ( "The example application can resolve ARP and reply to ICMPv4 packets.\n"); printf ("The program will exit once the interface is disconnected.\n"); printf ("==============================\n"); printf ("Usage: icmp_responder [OPTIONS]\n\n"); printf ("Options:\n"); printf ("\t-r\tInterface role . Default: slave\n"); printf ("\t-s\tSocket path. Supports abstract socket using @ before the " "path. Default: /run/vpp/memif.sock\n"); printf ("\t-i\tInterface id. Default: 0\n"); printf ("\t-a\tIPv4 address. Default: 192.168.1.1\n"); printf ("\t-h\tMac address. Default: aa:aa:aa:aa:aa:aa\n"); printf ("\t-?\tShow help and exit.\n"); printf ("\t-v\tShow libmemif and memif version information and exit.\n"); } int main (int argc, char *argv[]) { memif_socket_args_t memif_socket_args = { 0 }; memif_socket_handle_t memif_socket; memif_conn_args_t memif_conn_args = { 0 }; int opt, err, ret = 0; uint8_t is_master = 0; char socket_path[108]; int id = IF_ID; strncpy (socket_path, SOCKET_PATH, strlen (SOCKET_PATH)); /* prepare the private data */ memset (&intf, 0, sizeof (intf)); intf.packet_handler = icmp_packet_handler; memcpy (intf.ip_addr, IP_ADDR, 4); memcpy (intf.hw_addr, HW_ADDR, 6); while ((opt = getopt (argc, argv, "r:s:i:a:h:?v")) != -1) { switch (opt) { case 'r': if (strncmp (optarg, "master", sizeof (optarg)) == 0) { is_master = 1; } else if (strncmp (optarg, "slave", sizeof (optarg)) == 0) { is_master = 0; } else { INFO ("Invalid role value: '%s'", optarg); return -1; } break; case 's': sprintf (socket_path, "%s", optarg); break; case 'i': id = atoi (optarg); break; case 'a': if (parse_ip4 (optarg, intf.ip_addr) != 0) { INFO ("Invalid ipv4 address: %s", optarg); return -1; } break; case 'h': if (parse_mac (optarg, intf.hw_addr) != 0) { INFO ("Invalid mac address: %s", optarg); return -1; } break; case '?': print_help (); return 0; case 'v': print_version (); return 0; } } /** Create memif socket * * Interfaces are internally stored in a database referenced by memif socket. */ sprintf (memif_socket_args.path, "%s", socket_path); /* Set application name */ strncpy (memif_socket_args.app_name, APP_NAME, strlen (APP_NAME)); /* configure autoconnect timer */ if (is_master == 0) { memif_socket_args.connection_request_timer.it_value.tv_sec = 2; memif_socket_args.connection_request_timer.it_value.tv_nsec = 0; memif_socket_args.connection_request_timer.it_interval.tv_sec = 2; memif_socket_args.connection_request_timer.it_interval.tv_nsec = 0; } err = memif_create_socket (&memif_socket, &memif_socket_args, NULL); if (err != MEMIF_ERR_SUCCESS) { INFO ("memif_create_socket: %s", memif_strerror (err)); goto error; } /** Create memif interfaces * * Both interaces are assigned the same socket and same id to create a * loopback. */ memif_conn_args.socket = memif_socket; memif_conn_args.interface_id = id; strncpy (memif_conn_args.interface_name, IF_NAME, sizeof (memif_conn_args.interface_name)); memif_conn_args.is_master = is_master; err = memif_create (&intf.conn, &memif_conn_args, on_connect, on_disconnect, is_master ? responder : responder_zero_copy, (void *) &intf); if (err != MEMIF_ERR_SUCCESS) { INFO ("memif_create_socket: %s", memif_strerror (err)); return err; } do { err = memif_poll_event (memif_socket, -1); } while (err == MEMIF_ERR_SUCCESS); return 0; error: ret = -1; done: free_memif_buffers (&intf); memif_delete (&intf.conn); memif_delete_socket (&memif_socket); return ret; }