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working on lwip

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This commit is contained in:
Ulrich Mohr
2024-12-06 17:37:08 +01:00
parent 164b8ed6c2
commit ef51eb98e1
13 changed files with 886 additions and 13 deletions
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2
CMakeLists.txt
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@ -34,9 +34,7 @@ endif()
add_executable(${OBSW_NAME})
# export lwip path, so the bsp can find it
if(${CMAKE_CROSSCOMPILING})
set (LWIP_DIR ${CMAKE_CURRENT_SOURCE_DIR}/contrib/lwip)
endif()
# Platform dependend configuration
# Includes setting the FreeRTOS port, compiler options and

4
bsp_linux/CMakeLists.txt
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@ -1,8 +1,12 @@
add_library(bsp STATIC)
add_subdirectory(hardware)
add_subdirectory(lwip)
target_sources(bsp PRIVATE main.c)
# bsp depends on FreeRTOS
target_link_libraries(bsp PUBLIC freertos_kernel)
# export lwip as part of bsp
target_link_libraries(bsp INTERFACE lwip)

22
bsp_linux/lwip/CMakeLists.txt Normal file
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@ -0,0 +1,22 @@
# LWIP_DIR should point to the lwip source, to be set in main CMakeLists.txt
include(${LWIP_DIR}/src/Filelists.cmake)
set (LWIP_INCLUDE_DIRS
"${LWIP_DIR}/src/include"
"${LWIP_DIR}/src/include/compat/posix"
"include"
)
set(lwip_SRCS
${lwipcore_SRCS}
${lwipcore4_SRCS}
${lwipcore6_SRCS}
${lwipnetif_SRCS}
${lwipapi_SRCS}
#${LWIP_DIR}/contrib/ports/freertos/sys_arch.c
#${LWIP_DIR}/src/netif/slipif.c
#${LWIP_DIR}/src/apps/tftp/tftp.c
)
add_library(lwip ${lwip_SRCS})
target_include_directories(lwip PUBLIC ${LWIP_INCLUDE_DIRS})

25
bsp_linux/lwip/include/arch/cc.h Normal file
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@ -0,0 +1,25 @@
#pragma once
#include <stdio.h>
#include <stdlib.h>
#include "lwipopts.h"
/** if you want to use the struct timeval provided
* by your system, set this to 0 and include <sys/time.h> in cc.h */
#define LWIP_TIMEVAL_PRIVATE 0
#include <sys/time.h>
// errno is a macro. If we define LWIP_ERRNO_INCLUDE to errno.h the preprocessor will replace it,
// breaking the include. Instead we supply a helper include which in turn includes errno.h
#define LWIP_ERRNO_INCLUDE <onrre.h>
#define LWIP_RAND rand
#define PACK_STRUCT_FIELD(x) x
#define PACK_STRUCT_STRUCT __attribute__((packed))
#define PACK_STRUCT_BEGIN
#define PACK_STRUCT_END
#define LWIP_PLATFORM_ASSERT(x)
#define LWIP_PLATFORM_DIAG(x) do { printf x; } while(0)

336
bsp_linux/lwip/include/lwipopts.h Normal file
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@ -0,0 +1,336 @@
/*
* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
* 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: Adam Dunkels <adam@sics.se>
*
*/
#ifndef LWIP_LWIPOPTS_H
#define LWIP_LWIPOPTS_H
#define LWIP_IPV4 1
#define LWIP_IPV6 0
#define NO_SYS 1
#define LWIP_SOCKET 0
#define LWIP_NETCONN 0
#define LWIP_NETIF_API 0
#define LWIP_IGMP 0
#define LWIP_ICMP LWIP_IPV4
#define LWIP_SNMP 0
//#define MIB2_STATS LWIP_SNMP
#ifdef LWIP_HAVE_MBEDTLS
#define LWIP_SNMP_V3 (LWIP_SNMP)
#endif
#define LWIP_DNS 0
#define LWIP_MDNS_RESPONDER 0
#define LWIP_NUM_NETIF_CLIENT_DATA (LWIP_MDNS_RESPONDER)
#define LWIP_HAVE_LOOPIF 0
#define LWIP_NETIF_LOOPBACK 0
#define LWIP_LOOPBACK_MAX_PBUFS 0
#define TCP_LISTEN_BACKLOG 0
#define LWIP_COMPAT_SOCKETS 0
//TODO put this into the OS
#define LWIP_POSIX_SOCKETS_IO_NAMES 0
#define LWIP_SO_RCVTIMEO 0
#define LWIP_SO_RCVBUF 0
//TODO use this with LWIP_POSIX_SOCKETS_IO_NAMES
// TODO why is 100 not working...
#define LWIP_SOCKET_OFFSET 10
#define LWIP_SOCKET_SELECT 0
#define LWIP_SOCKET_POLL 0
#define LWIP_TCPIP_CORE_LOCKING 0
#define LWIP_NETIF_LINK_CALLBACK 1
#define LWIP_NETIF_STATUS_CALLBACK 1
#define LWIP_NETIF_EXT_STATUS_CALLBACK 1
//#define LWIP_DEBUG
#ifdef LWIP_DEBUG
#define LWIP_DBG_MIN_LEVEL LWIP_DBG_LEVEL_ALL
#define PPP_DEBUG LWIP_DBG_OFF
#define MEM_DEBUG LWIP_DBG_OFF
#define MEMP_DEBUG LWIP_DBG_OFF
#define PBUF_DEBUG LWIP_DBG_ON
#define API_LIB_DEBUG LWIP_DBG_ON
#define API_MSG_DEBUG LWIP_DBG_ON
#define TCPIP_DEBUG LWIP_DBG_ON
#define NETIF_DEBUG LWIP_DBG_ON
#define SOCKETS_DEBUG LWIP_DBG_ON
#define DNS_DEBUG LWIP_DBG_ON
#define AUTOIP_DEBUG LWIP_DBG_ON
#define DHCP_DEBUG LWIP_DBG_ON
#define IP_DEBUG LWIP_DBG_ON
#define IP_REASS_DEBUG LWIP_DBG_ON
#define ICMP_DEBUG LWIP_DBG_ON
#define IGMP_DEBUG LWIP_DBG_ON
#define UDP_DEBUG LWIP_DBG_ON
#define TCP_DEBUG LWIP_DBG_OFF
#define TCP_INPUT_DEBUG LWIP_DBG_OFF
#define TCP_OUTPUT_DEBUG LWIP_DBG_OFF
#define TCP_RTO_DEBUG LWIP_DBG_OFF
#define TCP_CWND_DEBUG LWIP_DBG_OFF
#define TCP_WND_DEBUG LWIP_DBG_OFF
#define TCP_FR_DEBUG LWIP_DBG_OFF
#define TCP_QLEN_DEBUG LWIP_DBG_OFF
#define TCP_RST_DEBUG LWIP_DBG_OFF
#define TIMERS_DEBUG LWIP_DBG_OFF
#define LWIP_DEBUG_TIMERNAMES LWIP_DBG_OFF
#endif
#define LWIP_DBG_TYPES_ON (LWIP_DBG_ON|LWIP_DBG_TRACE|LWIP_DBG_STATE|LWIP_DBG_FRESH|LWIP_DBG_HALT)
/* ---------- Memory options ---------- */
/* MEM_ALIGNMENT: should be set to the alignment of the CPU for which
lwIP is compiled. 4 byte alignment -> define MEM_ALIGNMENT to 4, 2
byte alignment -> define MEM_ALIGNMENT to 2. */
/* MSVC port: intel processors don't need 4-byte alignment,
but are faster that way! */
//TODO documentation
//Zynq needs 32 for DMA to work (something about cache I guess...)
#define MEM_ALIGNMENT 32U
#define MEM_USE_POOLS 1
#define MEMP_USE_CUSTOM_POOLS MEM_USE_POOLS
/* MEM_SIZE: the size of the heap memory. If the application will send
a lot of data that needs to be copied, this should be set high. */
#define MEM_SIZE 102400
/* MEMP_NUM_PBUF: the number of memp struct pbufs. If the application
sends a lot of data out of ROM (or other static memory), this
should be set high. */
#define MEMP_NUM_PBUF 16
/* MEMP_NUM_RAW_PCB: the number of UDP protocol control blocks. One
per active RAW "connection". */
#define MEMP_NUM_RAW_PCB 0
/* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
per active UDP "connection". */
#define MEMP_NUM_UDP_PCB 8
/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
connections. */
#define MEMP_NUM_TCP_PCB 0
/* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP
connections. */
#define MEMP_NUM_TCP_PCB_LISTEN 0
/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
segments. */
#define MEMP_NUM_TCP_SEG 0
/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active
timeouts. */
#define MEMP_NUM_SYS_TIMEOUT 17
/* The following four are used only with the sequential API and can be
set to 0 if the application only will use the raw API. */
/* MEMP_NUM_NETBUF: the number of struct netbufs. */
#define MEMP_NUM_NETBUF 0
/* MEMP_NUM_NETCONN: the number of struct netconns. */
#define MEMP_NUM_NETCONN 0
/* MEMP_NUM_TCPIP_MSG_*: the number of struct tcpip_msg, which is used
for sequential API communication and incoming packets. Used in
src/api/tcpip.c. */
#define MEMP_NUM_TCPIP_MSG_API 0
#define MEMP_NUM_TCPIP_MSG_INPKT 0
#define TCPIP_THREAD_STACKSIZE 10240
/* ---------- Pbuf options ---------- */
/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */
#define PBUF_POOL_SIZE 120
/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */
/* Needs to be large enough to fit eth MTU to be able to use DMA for xemacps rx*/
#define PBUF_POOL_BUFSIZE 1600
/** SYS_LIGHTWEIGHT_PROT
* define SYS_LIGHTWEIGHT_PROT in lwipopts.h if you want inter-task protection
* for certain critical regions during buffer allocation, deallocation and memory
* allocation and deallocation.
*/
#define SYS_LIGHTWEIGHT_PROT 0
/* ---------- TCP options ---------- */
#define LWIP_TCP 0
#define TCP_TTL 255
#define LWIP_ALTCP (LWIP_TCP)
#ifdef LWIP_HAVE_MBEDTLS
#define LWIP_ALTCP_TLS (LWIP_TCP)
#define LWIP_ALTCP_TLS_MBEDTLS (LWIP_TCP)
#endif
/* Controls if TCP should queue segments that arrive out of
order. Define to 0 if your device is low on memory. */
#define TCP_QUEUE_OOSEQ 1
/* TCP Maximum segment size. */
#define TCP_MSS 1024
/* TCP sender buffer space (bytes). */
#define TCP_SND_BUF 2048
/* TCP sender buffer space (pbufs). This must be at least = 2 *
TCP_SND_BUF/TCP_MSS for things to work. */
#define TCP_SND_QUEUELEN (4 * TCP_SND_BUF/TCP_MSS)
/* TCP writable space (bytes). This must be less than or equal
to TCP_SND_BUF. It is the amount of space which must be
available in the tcp snd_buf for select to return writable */
#define TCP_SNDLOWAT (TCP_SND_BUF/2)
/* TCP receive window. */
#define TCP_WND (20 * 1024)
/* Maximum number of retransmissions of data segments. */
#define TCP_MAXRTX 12
/* Maximum number of retransmissions of SYN segments. */
#define TCP_SYNMAXRTX 4
#define TCPIP_MBOX_SIZE 5
/* ---------- ARP options ---------- */
#define LWIP_ARP 1
#define ARP_TABLE_SIZE 10
#define ARP_QUEUEING 1
#define ARP_QUEUE_LEN 10
/* ---------- IP options ---------- */
/* Define IP_FORWARD to 1 if you wish to have the ability to forward
IP packets across network interfaces. If you are going to run lwIP
on a device with only one network interface, define this to 0. */
#define IP_FORWARD 1
/* IP reassembly and segmentation.These are orthogonal even
* if they both deal with IP fragments */
#define IP_REASSEMBLY 1
#define IP_REASS_MAX_PBUFS (10 * ((1500 + PBUF_POOL_BUFSIZE - 1) / PBUF_POOL_BUFSIZE))
#define MEMP_NUM_REASSDATA IP_REASS_MAX_PBUFS
#define IP_FRAG 1
#define IPV6_FRAG_COPYHEADER 1
/* ---------- ICMP options ---------- */
#define ICMP_TTL 255
/* ---------- DHCP options ---------- */
/* Define LWIP_DHCP to 1 if you want DHCP configuration of
interfaces. */
#define LWIP_DHCP 0
/* 1 if you want to do an ARP check on the offered address
(recommended). */
#define DHCP_DOES_ARP_CHECK (LWIP_DHCP)
/* ---------- AUTOIP options ------- */
#define LWIP_AUTOIP (LWIP_DHCP)
#define LWIP_DHCP_AUTOIP_COOP (LWIP_DHCP && LWIP_AUTOIP)
/* ---------- UDP options ---------- */
#define LWIP_UDP 1
#define LWIP_UDPLITE 0
#define UDP_TTL 255
#define DEFAULT_UDP_RECVMBOX_SIZE 4
/* ---------- RAW options ---------- */
#define LWIP_RAW 0
#define DEFAULT_TCP_RECVMBOX_SIZE 2
/* ---------- Statistics options ---------- */
#define LWIP_STATS 0
#define LWIP_STATS_DISPLAY 0
#if LWIP_STATS
#define LINK_STATS 1
#define IP_STATS 1
#define ICMP_STATS 1
#define IGMP_STATS 1
#define IPFRAG_STATS 1
#define UDP_STATS 1
#define TCP_STATS 1
#define MEM_STATS 1
#define MEMP_STATS 1
#define PBUF_STATS 1
#define SYS_STATS 1
#endif /* LWIP_STATS */
/* ---------- NETBIOS options ---------- */
#define LWIP_NETBIOS_RESPOND_NAME_QUERY 0
/* ---------- PPP options ---------- */
#define PPP_SUPPORT 0 /* Set > 0 for PPP */
#if PPP_SUPPORT
#define NUM_PPP 1 /* Max PPP sessions. */
/* Select modules to enable. Ideally these would be set in the makefile but
* we're limited by the command line length so you need to modify the settings
* in this file.
*/
#define PPPOE_SUPPORT 1
#define PPPOS_SUPPORT 1
#define PAP_SUPPORT 1 /* Set > 0 for PAP. */
#define CHAP_SUPPORT 1 /* Set > 0 for CHAP. */
#define MSCHAP_SUPPORT 0 /* Set > 0 for MSCHAP */
#define CBCP_SUPPORT 0 /* Set > 0 for CBCP (NOT FUNCTIONAL!) */
#define CCP_SUPPORT 0 /* Set > 0 for CCP */
#define VJ_SUPPORT 0 /* Set > 0 for VJ header compression. */
#define MD5_SUPPORT 1 /* Set > 0 for MD5 (see also CHAP) */
#endif /* PPP_SUPPORT */
// Disable slip task
#define SLIP_USE_RX_THREAD 0
#endif /* LWIP_LWIPOPTS_H */

5
bsp_linux/lwip/include/lwippools.h Normal file
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@ -0,0 +1,5 @@
LWIP_MALLOC_MEMPOOL_START
LWIP_MALLOC_MEMPOOL(50, 256)
LWIP_MALLOC_MEMPOOL(50, 512)
LWIP_MALLOC_MEMPOOL(50, 1550)
LWIP_MALLOC_MEMPOOL_END

2
bsp_linux/lwip/include/onrre.h Normal file
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@ -0,0 +1,2 @@
#pragma once
#include <errno.h>

16
bsp_z7/lwip/bare/include/lwipopts.h
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@ -139,19 +139,19 @@ a lot of data that needs to be copied, this should be set high. */
#define MEMP_NUM_PBUF 16
/* MEMP_NUM_RAW_PCB: the number of UDP protocol control blocks. One
per active RAW "connection". */
#define MEMP_NUM_RAW_PCB 3
#define MEMP_NUM_RAW_PCB 0
/* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
per active UDP "connection". */
#define MEMP_NUM_UDP_PCB 8
/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
connections. */
#define MEMP_NUM_TCP_PCB 5
#define MEMP_NUM_TCP_PCB 0
/* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP
connections. */
#define MEMP_NUM_TCP_PCB_LISTEN 8
#define MEMP_NUM_TCP_PCB_LISTEN 0
/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
segments. */
#define MEMP_NUM_TCP_SEG 16
#define MEMP_NUM_TCP_SEG 0
/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active
timeouts. */
#define MEMP_NUM_SYS_TIMEOUT 17
@ -159,14 +159,14 @@ a lot of data that needs to be copied, this should be set high. */
/* The following four are used only with the sequential API and can be
set to 0 if the application only will use the raw API. */
/* MEMP_NUM_NETBUF: the number of struct netbufs. */
#define MEMP_NUM_NETBUF 2
#define MEMP_NUM_NETBUF 0
/* MEMP_NUM_NETCONN: the number of struct netconns. */
#define MEMP_NUM_NETCONN 12
#define MEMP_NUM_NETCONN 0
/* MEMP_NUM_TCPIP_MSG_*: the number of struct tcpip_msg, which is used
for sequential API communication and incoming packets. Used in
src/api/tcpip.c. */
#define MEMP_NUM_TCPIP_MSG_API 16
#define MEMP_NUM_TCPIP_MSG_INPKT 16
#define MEMP_NUM_TCPIP_MSG_API 0
#define MEMP_NUM_TCPIP_MSG_INPKT 0
#define TCPIP_THREAD_STACKSIZE 10240

2
mission/CMakeLists.txt
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@ -3,4 +3,6 @@
# adds directly to the OBSW target
################################################
add_subdirectory(netif)
target_sources(${OBSW_NAME} PRIVATE mission.c freeRTOS_rust_helper.c)

56
mission/mission.c
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@ -7,6 +7,13 @@
#include "semphr.h"
#include "task.h"
#include "lwip/init.h"
#include "lwip/timeouts.h"
#include "lwip/udp.h"
#include <lwip/ip_addr.h>
#include <lwip/netif.h>
#include "netif/slipif.h"
void rust_main();
#include <hardware/interfaces.h>
@ -39,15 +46,62 @@ void test_hardware() {
write(1, buffer, read_bytes);
}
struct netif netif;
struct slipif_priv slipif_config;
static struct udp_pcb *udpecho_raw_pcb;
u32_t sys_now(void) { return xTaskGetTickCount() * portTICK_PERIOD_MS; }
void test_lwip() {
lwip_init();
ip4_addr_t slip_addr = {PP_HTONL(LWIP_MAKEU32(10, 13, 80, 10))},
slip_mask = {PP_HTONL(LWIP_MAKEU32(255, 255, 255, 0))},
slip_gw = {PP_HTONL(LWIP_MAKEU32(10, 13, 80, 1))};
slipif_config.fd = hw_device_open("uart1", 5);
netif_add(&netif, &slip_addr, &slip_mask, &slip_gw, &slipif_config, slipif_init,
netif_input);
netif_set_default(&netif);
// should be done by driver, which does not do it, so we do it here
netif_set_link_up(&netif);
netif_set_up(&netif);
udpecho_raw_pcb = udp_new_ip_type(IPADDR_TYPE_ANY);
if (udpecho_raw_pcb != NULL) {
err_t err;
err = udp_bind(udpecho_raw_pcb, IP_ANY_TYPE, 7);
if (err != ERR_OK) {
return;
}
ip_addr_t addr = IPADDR4_INIT_BYTES(10,13,80,1);
uint8_t data[] = {'1','2','3','4'};
struct pbuf* tx = pbuf_alloc_reference(data, sizeof(data), PBUF_REF);
udp_sendto(udpecho_raw_pcb,tx,&addr,1234);
}
}
// called to stop execution (either a panic or program ended)
// to be implemented by bsp (do not return from it!)
void done();
void init_task(void * _) {
(void )_;
// printf("Starting Mission\n");
test_hardware();
//test_hardware();
test_lwip();
rust_main();

1
mission/netif/CMakeLists.txt Normal file
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@ -0,0 +1 @@
target_sources(${OBSW_NAME} PRIVATE slipif.c)

409
mission/netif/slipif.c Normal file
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@ -0,0 +1,409 @@
/**
* @file
* SLIP Interface
*
*/
/*
* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
* 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. Neither the name of the Institute 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 BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE 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.
*
* This file is built upon the file: src/arch/rtxc/netif/sioslip.c
*
* Author: Magnus Ivarsson <magnus.ivarsson(at)volvo.com>
* Simon Goldschmidt
*/
/**
* @defgroup slipif SLIP
* @ingroup netifs
*
* This is an arch independent SLIP netif. The specific serial hooks must be
* provided by another file. They are sio_open, sio_read/sio_tryread and sio_send
*
* Usage: This netif can be used in three ways:
* 1. For NO_SYS==0, an RX thread can be used which blocks on sio_read()
* until data is received.
* 2. In your main loop, call slipif_poll() to check for new RX bytes,
* completed packets are fed into netif->input().
* 3. Call slipif_received_byte[s]() from your serial RX ISR and
* slipif_process_rxqueue() from your main loop. ISR level decodes
* packets and puts completed packets on a queue which is fed into
* the stack from the main loop (needs SYS_LIGHTWEIGHT_PROT for
* pbuf_alloc to work on ISR level!).
*
*/
#include "slipif.h"
#include "lwip/opt.h"
#include "lwip/def.h"
#include "lwip/pbuf.h"
#include "lwip/stats.h"
#include "lwip/snmp.h"
#include "lwip/sys.h"
#define SLIP_END 0xC0 /* 0300: start and end of every packet */
#define SLIP_ESC 0xDB /* 0333: escape start (one byte escaped data follows) */
#define SLIP_ESC_END 0xDC /* 0334: following escape: original byte is 0xC0 (END) */
#define SLIP_ESC_ESC 0xDD /* 0335: following escape: original byte is 0xDB (ESC) */
/** Maximum packet size that is received by this netif */
#ifndef SLIP_MAX_SIZE
#define SLIP_MAX_SIZE 1500
#endif
#ifndef SLIP_CHUNK_SIZE
#define SLIP_CHUNK_SIZE 120
#endif
enum slipif_recv_state {
SLIP_RECV_NORMAL,
SLIP_RECV_ESCAPE
};
static void
slipif_send_chunk(uint8_t c, int fd, uint8_t *chunk, size_t *current_index, size_t chunksize, int flush){
if (*current_index >= chunksize) {
write(0,"stra", 5);
//chunk is already full, send it and reset
write(fd, chunk, chunksize);
*current_index = 0;
}
// add byte to chunk, (can not be full, we checked)
if (*current_index < chunksize) {
chunk[*current_index] = c;
(*current_index)++;
}
// if either chunk is full or we shall flush, send it
if ((*current_index >= chunksize) || ( flush != 0)) {
write(0,"full", 5);
write(fd, chunk, *current_index);
*current_index = 0;
}
}
/**
* Send a pbuf doing the necessary SLIP encapsulation
*
* Uses the serial layer's sio_send()
*
* @param netif the lwip network interface structure for this slipif
* @param p the pbuf chain packet to send
* @return always returns ERR_OK since the serial layer does not provide return values
*/
static err_t
slipif_output(struct netif *netif, struct pbuf *p)
{
struct slipif_priv *priv;
struct pbuf *q;
u16_t i;
u8_t c;
uint8_t chunk[SLIP_CHUNK_SIZE];
size_t current_index = 0;
LWIP_ASSERT("netif != NULL", (netif != NULL));
LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
LWIP_ASSERT("p != NULL", (p != NULL));
LWIP_DEBUGF(SLIP_DEBUG, ("slipif_output: sending %"U16_F" bytes\n", p->tot_len));
priv = (struct slipif_priv *)netif->state;
/* Send pbuf out on the serial I/O device. */
/* Start with packet delimiter. */
slipif_send_chunk(SLIP_END, priv->fd, chunk, &current_index, sizeof(chunk), 0);
for (q = p; q != NULL; q = q->next) {
for (i = 0; i < q->len; i++) {
c = ((u8_t *)q->payload)[i];
switch (c) {
case SLIP_END:
/* need to escape this byte (0xC0 -> 0xDB, 0xDC) */
slipif_send_chunk(SLIP_ESC, priv->fd, chunk, &current_index, sizeof(chunk), 0);
slipif_send_chunk(SLIP_ESC_END, priv->fd, chunk, &current_index, sizeof(chunk), 0);
break;
case SLIP_ESC:
/* need to escape this byte (0xDB -> 0xDB, 0xDD) */
slipif_send_chunk(SLIP_ESC, priv->fd, chunk, &current_index, sizeof(chunk), 0);
slipif_send_chunk(SLIP_ESC_ESC, priv->fd, chunk, &current_index, sizeof(chunk), 0);
break;
default:
/* normal byte - no need for escaping */
slipif_send_chunk(c, priv->fd, chunk, &current_index, sizeof(chunk), 0);
break;
}
}
}
/* End with packet delimiter, flush the chunk */
slipif_send_chunk(SLIP_END, priv->fd, chunk, &current_index, sizeof(chunk), 1);
return ERR_OK;
}
#if LWIP_IPV4
/**
* Send a pbuf doing the necessary SLIP encapsulation
*
* Uses the serial layer's sio_send()
*
* @param netif the lwip network interface structure for this slipif
* @param p the pbuf chain packet to send
* @param ipaddr the ip address to send the packet to (not used for slipif)
* @return always returns ERR_OK since the serial layer does not provide return values
*/
static err_t
slipif_output_v4(struct netif *netif, struct pbuf *p, const ip4_addr_t *ipaddr)
{
LWIP_UNUSED_ARG(ipaddr);
return slipif_output(netif, p);
}
#endif /* LWIP_IPV4 */
#if LWIP_IPV6
/**
* Send a pbuf doing the necessary SLIP encapsulation
*
* Uses the serial layer's sio_send()
*
* @param netif the lwip network interface structure for this slipif
* @param p the pbuf chain packet to send
* @param ipaddr the ip address to send the packet to (not used for slipif)
* @return always returns ERR_OK since the serial layer does not provide return values
*/
static err_t
slipif_output_v6(struct netif *netif, struct pbuf *p, const ip6_addr_t *ipaddr)
{
LWIP_UNUSED_ARG(ipaddr);
return slipif_output(netif, p);
}
#endif /* LWIP_IPV6 */
/**
* Handle the incoming SLIP stream character by character
*
* @param netif the lwip network interface structure for this slipif
* @param c received character (multiple calls to this function will
* return a complete packet, NULL is returned before - used for polling)
* @return The IP packet when SLIP_END is received
*/
static struct pbuf *
slipif_rxbyte(struct netif *netif, u8_t c)
{
struct slipif_priv *priv;
struct pbuf *t;
LWIP_ASSERT("netif != NULL", (netif != NULL));
LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
priv = (struct slipif_priv *)netif->state;
switch (priv->state) {
case SLIP_RECV_NORMAL:
switch (c) {
case SLIP_END:
if (priv->recved > 0) {
/* Received whole packet. */
/* Trim the pbuf to the size of the received packet. */
pbuf_realloc(priv->q, priv->recved);
LINK_STATS_INC(link.recv);
LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet (%"U16_F" bytes)\n", priv->recved));
t = priv->q;
priv->p = priv->q = NULL;
priv->i = priv->recved = 0;
return t;
}
return NULL;
case SLIP_ESC:
priv->state = SLIP_RECV_ESCAPE;
return NULL;
default:
break;
} /* end switch (c) */
break;
case SLIP_RECV_ESCAPE:
/* un-escape END or ESC bytes, leave other bytes
(although that would be a protocol error) */
switch (c) {
case SLIP_ESC_END:
c = SLIP_END;
break;
case SLIP_ESC_ESC:
c = SLIP_ESC;
break;
default:
break;
}
priv->state = SLIP_RECV_NORMAL;
break;
default:
break;
} /* end switch (priv->state) */
/* byte received, packet not yet completely received */
if (priv->p == NULL) {
/* allocate a new pbuf */
LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n"));
priv->p = pbuf_alloc(PBUF_LINK, (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN - PBUF_LINK_ENCAPSULATION_HLEN), PBUF_POOL);
if (priv->p == NULL) {
LINK_STATS_INC(link.drop);
LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n"));
/* don't process any further since we got no pbuf to receive to */
return NULL;
}
if (priv->q != NULL) {
/* 'chain' the pbuf to the existing chain */
pbuf_cat(priv->q, priv->p);
} else {
/* p is the first pbuf in the chain */
priv->q = priv->p;
}
}
/* this automatically drops bytes if > SLIP_MAX_SIZE */
if ((priv->p != NULL) && (priv->recved <= SLIP_MAX_SIZE)) {
((u8_t *)priv->p->payload)[priv->i] = c;
priv->recved++;
priv->i++;
if (priv->i >= priv->p->len) {
/* on to the next pbuf */
priv->i = 0;
if (priv->p->next != NULL && priv->p->next->len > 0) {
/* p is a chain, on to the next in the chain */
priv->p = priv->p->next;
} else {
/* p is a single pbuf, set it to NULL so next time a new
* pbuf is allocated */
priv->p = NULL;
}
}
}
return NULL;
}
/** Like slipif_rxbyte, but passes completed packets to netif->input
*
* @param netif The lwip network interface structure for this slipif
* @param c received character
*/
static void
slipif_rxbyte_input(struct netif *netif, u8_t c)
{
struct pbuf *p;
p = slipif_rxbyte(netif, c);
if (p != NULL) {
if (netif->input(p, netif) != ERR_OK) {
pbuf_free(p);
}
}
}
/**
* @ingroup slipif
* SLIP netif initialization
*
* Call the arch specific sio_open and remember
* the opened device in the state field of the netif.
*
* @param netif the lwip network interface structure for this slipif
* @return ERR_OK if serial line could be opened,
* ERR_MEM if no memory could be allocated,
* ERR_IF is serial line couldn't be opened
*
* @note If netif->state is interpreted as an u8_t serial port number.
*
*/
err_t
slipif_init(struct netif *netif)
{
struct slipif_priv *priv;
LWIP_ASSERT("slipif needs an input callback", netif->input != NULL);
LWIP_DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%"U16_F"\n", (u16_t)sio_num));
netif->name[0] = 's';
netif->name[1] = 'l';
#if LWIP_IPV4
netif->output = slipif_output_v4;
#endif /* LWIP_IPV4 */
#if LWIP_IPV6
netif->output_ip6 = slipif_output_v6;
#endif /* LWIP_IPV6 */
netif->mtu = SLIP_MAX_SIZE;
/* private data needs to be allocated by user and passed via state (see netif_add()) */
priv = netif->state;
/* Initialize private data */
priv->p = NULL;
priv->q = NULL;
priv->state = SLIP_RECV_NORMAL;
priv->i = 0;
priv->recved = 0;
LWIP_ASSERT("slipif private data fd needs to be initialized before calling netif_add()", priv->fd != 0);
/* initialize the snmp variables and counters inside the struct netif */
MIB2_INIT_NETIF(netif, snmp_ifType_slip, SLIP_SIO_SPEED(priv->sd));
return ERR_OK;
}
/**
* @ingroup slipif
* Polls the serial device and feeds the IP layer with incoming packets.
*
* @param netif The lwip network interface structure for this slipif
*/
void
slipif_poll(struct netif *netif)
{
struct slipif_priv *priv;
LWIP_ASSERT("netif != NULL", (netif != NULL));
LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
priv = (struct slipif_priv *)netif->state;
uint8_t chunk[SLIP_CHUNK_SIZE];
int read_bytes = read(priv->fd, chunk, sizeof(chunk));
for (int i = 0; i < read_bytes; i++){
slipif_rxbyte_input(netif, chunk[i]);
}
}

15
mission/netif/slipif.h Normal file
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#pragma once
#include "lwip/opt.h"
#include "lwip/netif.h"
struct slipif_priv {
int fd;
/* q is the whole pbuf chain for a packet, p is the current pbuf in the chain */
struct pbuf *p, *q;
u8_t state;
u16_t i, recved;
};
err_t slipif_init(struct netif * netif);
void slipif_poll(struct netif *netif);