/** * @file * lwIP iPerf server implementation */ /** * @defgroup iperf Iperf server * @ingroup apps * * This is a simple performance measuring server to check your bandwith using * iPerf2 on a PC as client. * It is currently a minimal implementation providing an IPv4 TCP server only. * * @todo: implement UDP mode and IPv6 */ /* * Copyright (c) 2014 Simon Goldschmidt * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT * SHALL THE AUTHOR 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. * * This file is part of the lwIP TCP/IP stack. * * Author: Simon Goldschmidt */ #include "lwip/apps/lwiperf.h" #include "lwip/tcp.h" #include "lwip/sys.h" #include /* Currently, only TCP-over-IPv4 is implemented (does iperf support IPv6 anyway?) */ #if LWIP_IPV4 && LWIP_TCP && LWIP_CALLBACK_API /** Specify the idle timeout (in seconds) after that the test fails */ #ifndef LWIPERF_TCP_MAX_IDLE_SEC #define LWIPERF_TCP_MAX_IDLE_SEC 10U #endif #if LWIPERF_TCP_MAX_IDLE_SEC > 255 #error LWIPERF_TCP_MAX_IDLE_SEC must fit into an u8_t #endif /* File internal memory allocation (struct lwiperf_*): this defaults to the heap */ #ifndef LWIPERF_ALLOC #define LWIPERF_ALLOC(type) mem_malloc(sizeof(type)) #define LWIPERF_FREE(type, item) mem_free(item) #endif /** If this is 1, check that received data has the correct format */ #ifndef LWIPERF_CHECK_RX_DATA #define LWIPERF_CHECK_RX_DATA 0 #endif /** This is the Iperf settings struct sent from the client */ typedef struct _lwiperf_settings { #define LWIPERF_FLAGS_ANSWER_TEST 0x80000000 #define LWIPERF_FLAGS_ANSWER_NOW 0x00000001 u32_t flags; u32_t num_threads; /* unused for now */ u32_t remote_port; u32_t buffer_len; /* unused for now */ u32_t win_band; /* TCP window / UDP rate: unused for now */ u32_t amount; /* pos. value: bytes?; neg. values: time (unit is 10ms: 1/100 second) */ } lwiperf_settings_t; /** Basic connection handle */ struct _lwiperf_state_base; typedef struct _lwiperf_state_base lwiperf_state_base_t; struct _lwiperf_state_base { /* 1=tcp, 0=udp */ u8_t tcp; /* 1=server, 0=client */ u8_t server; lwiperf_state_base_t* next; lwiperf_state_base_t* related_server_state; }; /** Connection handle for a TCP iperf session */ typedef struct _lwiperf_state_tcp { lwiperf_state_base_t base; struct tcp_pcb* server_pcb; struct tcp_pcb* conn_pcb; u32_t time_started; lwiperf_report_fn report_fn; void* report_arg; u8_t poll_count; u8_t next_num; u32_t bytes_transferred; lwiperf_settings_t settings; u8_t have_settings_buf; } lwiperf_state_tcp_t; /** List of active iperf sessions */ static lwiperf_state_base_t* lwiperf_all_connections = 0; /** A const buffer to send from: we want to measure sending, not copying! */ static const u8_t lwiperf_txbuf_const[1600] = { '0','1','2','3','4','5','6','7','8','9','0','1','2','3','4','5','6','7','8','9','0','1','2','3','4','5','6','7','8','9','0','1','2','3','4','5','6','7','8','9', 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'0','1','2','3','4','5','6','7','8','9','0','1','2','3','4','5','6','7','8','9','0','1','2','3','4','5','6','7','8','9','0','1','2','3','4','5','6','7','8','9', '0','1','2','3','4','5','6','7','8','9','0','1','2','3','4','5','6','7','8','9','0','1','2','3','4','5','6','7','8','9','0','1','2','3','4','5','6','7','8','9', '0','1','2','3','4','5','6','7','8','9','0','1','2','3','4','5','6','7','8','9','0','1','2','3','4','5','6','7','8','9','0','1','2','3','4','5','6','7','8','9', }; static err_t lwiperf_tcp_poll(void *arg, struct tcp_pcb *tpcb); static void lwiperf_tcp_err(void *arg, err_t err); /** Add an iperf session to the 'active' list */ static void lwiperf_list_add(lwiperf_state_base_t* item) { item->next = lwiperf_all_connections; lwiperf_all_connections = item; } /** Remove an iperf session from the 'active' list */ static void lwiperf_list_remove(lwiperf_state_base_t* item) { lwiperf_state_base_t* prev = NULL; lwiperf_state_base_t* iter; for (iter = lwiperf_all_connections; iter != NULL; prev = iter, iter = iter->next) { if (iter == item) { if (prev == NULL) { lwiperf_all_connections = iter->next; } else { prev->next = iter->next; } break; } } } /** Call the report function of an iperf tcp session */ static void lwip_tcp_conn_report(lwiperf_state_tcp_t* conn, enum lwiperf_report_type report_type) { if ((conn != NULL) && (conn->report_fn != NULL)) { u32_t now, duration_ms, bandwidth_kbitpsec; now = sys_now(); duration_ms = now - conn->time_started; if (duration_ms == 0) { bandwidth_kbitpsec = 0; } else { bandwidth_kbitpsec = (conn->bytes_transferred / duration_ms) * 8U; } conn->report_fn(conn->report_arg, report_type, &conn->conn_pcb->local_ip, conn->conn_pcb->local_port, &conn->conn_pcb->remote_ip, conn->conn_pcb->remote_port, conn->bytes_transferred, duration_ms, bandwidth_kbitpsec); } } /** Close an iperf tcp session */ static void lwiperf_tcp_close(lwiperf_state_tcp_t* conn, enum lwiperf_report_type report_type) { err_t err; lwip_tcp_conn_report(conn, report_type); lwiperf_list_remove(&conn->base); if (conn->conn_pcb != NULL) { tcp_arg(conn->conn_pcb, NULL); tcp_poll(conn->conn_pcb, NULL, 0); tcp_sent(conn->conn_pcb, NULL); tcp_recv(conn->conn_pcb, NULL); tcp_err(conn->conn_pcb, NULL); err = tcp_close(conn->conn_pcb); if (err != ERR_OK) { /* don't want to wait for free memory here... */ tcp_abort(conn->conn_pcb); } } else { /* no conn pcb, this is the server pcb */ err = tcp_close(conn->server_pcb); LWIP_ASSERT("error", err != ERR_OK); } LWIPERF_FREE(lwiperf_state_tcp_t, conn); } /** Try to send more data on an iperf tcp session */ static err_t lwiperf_tcp_client_send_more(lwiperf_state_tcp_t* conn) { int send_more; err_t err; u16_t txlen; u16_t txlen_max; void* txptr; u8_t apiflags; LWIP_ASSERT("conn invalid", (conn != NULL) && conn->base.tcp && (conn->base.server == 0)); do { send_more = 0; if (conn->settings.amount & PP_HTONL(0x80000000)) { /* this session is time-limited */ u32_t now = sys_now(); u32_t diff_ms = now - conn->time_started; u32_t time = (u32_t)-(s32_t)lwip_htonl(conn->settings.amount); u32_t time_ms = time * 10; if (diff_ms >= time_ms) { /* time specified by the client is over -> close the connection */ lwiperf_tcp_close(conn, LWIPERF_TCP_DONE_CLIENT); return ERR_OK; } } else { /* this session is byte-limited */ u32_t amount_bytes = lwip_htonl(conn->settings.amount); /* @todo: this can send up to 1*MSS more than requested... */ if (amount_bytes >= conn->bytes_transferred) { /* all requested bytes transferred -> close the connection */ lwiperf_tcp_close(conn, LWIPERF_TCP_DONE_CLIENT); return ERR_OK; } } if (conn->bytes_transferred < 24) { /* transmit the settings a first time */ txptr = &((u8_t*)&conn->settings)[conn->bytes_transferred]; txlen_max = (u16_t)(24 - conn->bytes_transferred); apiflags = TCP_WRITE_FLAG_COPY; } else if (conn->bytes_transferred < 48) { /* transmit the settings a second time */ txptr = &((u8_t*)&conn->settings)[conn->bytes_transferred - 24]; txlen_max = (u16_t)(48 - conn->bytes_transferred); apiflags = TCP_WRITE_FLAG_COPY | TCP_WRITE_FLAG_MORE; send_more = 1; } else { /* transmit data */ /* @todo: every x bytes, transmit the settings again */ txptr = LWIP_CONST_CAST(void*, &lwiperf_txbuf_const[conn->bytes_transferred % 10]); txlen_max = TCP_MSS; if (conn->bytes_transferred == 48) { /* @todo: fix this for intermediate settings, too */ txlen_max = TCP_MSS - 24; } apiflags = 0; /* no copying needed */ send_more = 1; } txlen = txlen_max; do { err = tcp_write(conn->conn_pcb, txptr, txlen, apiflags); if (err == ERR_MEM) { txlen /= 2; } } while ((err == ERR_MEM) && (txlen >= (TCP_MSS/2))); if (err == ERR_OK) { conn->bytes_transferred += txlen; } else { send_more = 0; } } while(send_more); tcp_output(conn->conn_pcb); return ERR_OK; } /** TCP sent callback, try to send more data */ static err_t lwiperf_tcp_client_sent(void *arg, struct tcp_pcb *tpcb, u16_t len) { lwiperf_state_tcp_t* conn = (lwiperf_state_tcp_t*)arg; /* @todo: check 'len' (e.g. to time ACK of all data)? for now, we just send more... */ LWIP_ASSERT("invalid conn", conn->conn_pcb == tpcb); LWIP_UNUSED_ARG(tpcb); LWIP_UNUSED_ARG(len); conn->poll_count = 0; return lwiperf_tcp_client_send_more(conn); } /** TCP connected callback (active connection), send data now */ static err_t lwiperf_tcp_client_connected(void *arg, struct tcp_pcb *tpcb, err_t err) { lwiperf_state_tcp_t* conn = (lwiperf_state_tcp_t*)arg; LWIP_ASSERT("invalid conn", conn->conn_pcb == tpcb); LWIP_UNUSED_ARG(tpcb); if (err != ERR_OK) { lwiperf_tcp_close(conn, LWIPERF_TCP_ABORTED_REMOTE); return ERR_OK; } conn->poll_count = 0; conn->time_started = sys_now(); return lwiperf_tcp_client_send_more(conn); } /** Start TCP connection back to the client (either parallel or after the * receive test has finished. */ static err_t lwiperf_tx_start(lwiperf_state_tcp_t* conn) { err_t err; lwiperf_state_tcp_t* client_conn; struct tcp_pcb* newpcb; ip_addr_t remote_addr; u16_t remote_port; client_conn = (lwiperf_state_tcp_t*)LWIPERF_ALLOC(lwiperf_state_tcp_t); if (client_conn == NULL) { return ERR_MEM; } newpcb = tcp_new(); if (newpcb == NULL) { LWIPERF_FREE(lwiperf_state_tcp_t, client_conn); return ERR_MEM; } MEMCPY(client_conn, conn, sizeof(lwiperf_state_tcp_t)); client_conn->base.related_server_state = NULL; client_conn->base.server = 0; client_conn->server_pcb = NULL; client_conn->conn_pcb = newpcb; client_conn->time_started = sys_now(); /* @todo: set this again on 'connected' */ client_conn->poll_count = 0; client_conn->next_num = 4; /* initial nr is '4' since the header has 24 byte */ client_conn->bytes_transferred = 0; client_conn->settings.flags = 0; /* prevent the remote side starting back as client again */ tcp_arg(newpcb, client_conn); tcp_sent(newpcb, lwiperf_tcp_client_sent); tcp_poll(newpcb, lwiperf_tcp_poll, 2U); tcp_err(newpcb, lwiperf_tcp_err); ip_addr_copy(remote_addr, conn->conn_pcb->remote_ip); remote_port = (u16_t)lwip_htonl(client_conn->settings.remote_port); err = tcp_connect(newpcb, &remote_addr, remote_port, lwiperf_tcp_client_connected); if (err != ERR_OK) { lwiperf_tcp_close(client_conn, LWIPERF_TCP_ABORTED_LOCAL); return err; } lwiperf_list_add(&client_conn->base); return ERR_OK; } /** Receive data on an iperf tcp session */ static err_t lwiperf_tcp_recv(void *arg, struct tcp_pcb *tpcb, struct pbuf *p, err_t err) { u8_t tmp; u16_t tot_len; u32_t packet_idx; struct pbuf* q; lwiperf_state_tcp_t* conn = (lwiperf_state_tcp_t*)arg; LWIP_ASSERT("pcb mismatch", conn->conn_pcb == tpcb); LWIP_UNUSED_ARG(tpcb); if (err != ERR_OK) { lwiperf_tcp_close(conn, LWIPERF_TCP_ABORTED_REMOTE); return ERR_OK; } if (p == NULL) { /* connection closed -> test done */ if ((conn->settings.flags & PP_HTONL(LWIPERF_FLAGS_ANSWER_TEST|LWIPERF_FLAGS_ANSWER_NOW)) == PP_HTONL(LWIPERF_FLAGS_ANSWER_TEST)) { /* client requested transmission after end of test */ lwiperf_tx_start(conn); } lwiperf_tcp_close(conn, LWIPERF_TCP_DONE_SERVER); return ERR_OK; } tot_len = p->tot_len; conn->poll_count = 0; if ((!conn->have_settings_buf) || ((conn->bytes_transferred -24) % (1024*128) == 0)) { /* wait for 24-byte header */ if (p->tot_len < sizeof(lwiperf_settings_t)) { lwiperf_tcp_close(conn, LWIPERF_TCP_ABORTED_LOCAL_DATAERROR); pbuf_free(p); return ERR_VAL; } if (!conn->have_settings_buf) { if (pbuf_copy_partial(p, &conn->settings, sizeof(lwiperf_settings_t), 0) != sizeof(lwiperf_settings_t)) { lwiperf_tcp_close(conn, LWIPERF_TCP_ABORTED_LOCAL); pbuf_free(p); return ERR_VAL; } conn->have_settings_buf = 1; if ((conn->settings.flags & PP_HTONL(LWIPERF_FLAGS_ANSWER_TEST|LWIPERF_FLAGS_ANSWER_NOW)) == PP_HTONL(LWIPERF_FLAGS_ANSWER_TEST|LWIPERF_FLAGS_ANSWER_NOW)) { /* client requested parallel transmission test */ err_t err2 = lwiperf_tx_start(conn); if (err2 != ERR_OK) { lwiperf_tcp_close(conn, LWIPERF_TCP_ABORTED_LOCAL_TXERROR); pbuf_free(p); return err2; } } } else { if (pbuf_memcmp(p, 0, &conn->settings, sizeof(lwiperf_settings_t)) != 0) { lwiperf_tcp_close(conn, LWIPERF_TCP_ABORTED_LOCAL_DATAERROR); pbuf_free(p); return ERR_VAL; } } conn->bytes_transferred += sizeof(lwiperf_settings_t); if (conn->bytes_transferred <= 24) { conn->time_started = sys_now(); tcp_recved(tpcb, p->tot_len); pbuf_free(p); return ERR_OK; } conn->next_num = 4; /* 24 bytes received... */ tmp = pbuf_header(p, -24); LWIP_ASSERT("pbuf_header failed", tmp == 0); (void)tmp; } packet_idx = 0; for (q = p; q != NULL; q = q->next) { #if LWIPERF_CHECK_RX_DATA const u8_t* payload = (const u8_t*)q->payload; u16_t i; for (i = 0; i < q->len; i++) { u8_t val = payload[i]; u8_t num = val - '0'; if (num == conn->next_num) { conn->next_num++; if (conn->next_num == 10) { conn->next_num = 0; } } else { lwiperf_tcp_close(conn, LWIPERF_TCP_ABORTED_LOCAL_DATAERROR); pbuf_free(p); return ERR_VAL; } } #endif packet_idx += q->len; } LWIP_ASSERT("count mismatch", packet_idx == p->tot_len); conn->bytes_transferred += packet_idx; tcp_recved(tpcb, tot_len); pbuf_free(p); return ERR_OK; } /** Error callback, iperf tcp session aborted */ static void lwiperf_tcp_err(void *arg, err_t err) { lwiperf_state_tcp_t* conn = (lwiperf_state_tcp_t*)arg; LWIP_UNUSED_ARG(err); lwiperf_tcp_close(conn, LWIPERF_TCP_ABORTED_REMOTE); } /** TCP poll callback, try to send more data */ static err_t lwiperf_tcp_poll(void *arg, struct tcp_pcb *tpcb) { lwiperf_state_tcp_t* conn = (lwiperf_state_tcp_t*)arg; LWIP_ASSERT("pcb mismatch", conn->conn_pcb == tpcb); LWIP_UNUSED_ARG(tpcb); if (++conn->poll_count >= LWIPERF_TCP_MAX_IDLE_SEC) { lwiperf_tcp_close(conn, LWIPERF_TCP_ABORTED_LOCAL); return ERR_OK; /* lwiperf_tcp_close frees conn */ } if (!conn->base.server) { lwiperf_tcp_client_send_more(conn); } return ERR_OK; } /** This is called when a new client connects for an iperf tcp session */ static err_t lwiperf_tcp_accept(void *arg, struct tcp_pcb *newpcb, err_t err) { lwiperf_state_tcp_t *s, *conn; if ((err != ERR_OK) || (newpcb == NULL) || (arg == NULL)) { return ERR_VAL; } s = (lwiperf_state_tcp_t*)arg; conn = (lwiperf_state_tcp_t*)LWIPERF_ALLOC(lwiperf_state_tcp_t); if (conn == NULL) { return ERR_MEM; } memset(conn, 0, sizeof(lwiperf_state_tcp_t)); conn->base.tcp = 1; conn->base.server = 1; conn->base.related_server_state = &s->base; conn->server_pcb = s->server_pcb; conn->conn_pcb = newpcb; conn->time_started = sys_now(); conn->report_fn = s->report_fn; conn->report_arg = s->report_arg; /* setup the tcp rx connection */ tcp_arg(newpcb, conn); tcp_recv(newpcb, lwiperf_tcp_recv); tcp_poll(newpcb, lwiperf_tcp_poll, 2U); tcp_err(conn->conn_pcb, lwiperf_tcp_err); lwiperf_list_add(&conn->base); return ERR_OK; } /** * @ingroup iperf * Start a TCP iperf server on the default TCP port (5001) and listen for * incoming connections from iperf clients. * * @returns a connection handle that can be used to abort the server * by calling @ref lwiperf_abort() */ void* lwiperf_start_tcp_server_default(lwiperf_report_fn report_fn, void* report_arg) { return lwiperf_start_tcp_server(IP_ADDR_ANY, LWIPERF_TCP_PORT_DEFAULT, report_fn, report_arg); } /** * @ingroup iperf * Start a TCP iperf server on a specific IP address and port and listen for * incoming connections from iperf clients. * * @returns a connection handle that can be used to abort the server * by calling @ref lwiperf_abort() */ void* lwiperf_start_tcp_server(const ip_addr_t* local_addr, u16_t local_port, lwiperf_report_fn report_fn, void* report_arg) { err_t err; struct tcp_pcb* pcb; lwiperf_state_tcp_t* s; if (local_addr == NULL) { return NULL; } s = (lwiperf_state_tcp_t*)LWIPERF_ALLOC(lwiperf_state_tcp_t); if (s == NULL) { return NULL; } memset(s, 0, sizeof(lwiperf_state_tcp_t)); s->base.tcp = 1; s->base.server = 1; s->base.related_server_state = NULL; s->report_fn = report_fn; s->report_arg = report_arg; pcb = tcp_new(); if (pcb != NULL) { err = tcp_bind(pcb, local_addr, local_port); if (err == ERR_OK) { s->server_pcb = tcp_listen_with_backlog(pcb, 1); } } if (s->server_pcb == NULL) { if (pcb != NULL) { tcp_close(pcb); } LWIPERF_FREE(lwiperf_state_tcp_t, s); return NULL; } pcb = NULL; tcp_arg(s->server_pcb, s); tcp_accept(s->server_pcb, lwiperf_tcp_accept); lwiperf_list_add(&s->base); return s; } /** * @ingroup iperf * Abort an iperf session (handle returned by lwiperf_start_tcp_server*()) */ void lwiperf_abort(void* lwiperf_session) { lwiperf_state_base_t* i, *dealloc, *last = NULL; for (i = lwiperf_all_connections; i != NULL; ) { if ((i == lwiperf_session) || (i->related_server_state == lwiperf_session)) { dealloc = i; i = i->next; if (last != NULL) { last->next = i; } LWIPERF_FREE(lwiperf_state_tcp_t, dealloc); /* @todo: type? */ } else { last = i; i = i->next; } } } #endif /* LWIP_IPV4 && LWIP_TCP && LWIP_CALLBACK_API */