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https://github.com/zephyrproject-rtos/zephyr
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abb86939ca
In ipv6 the type field of the ethernet header is left blank and the net buffer size is not updated with the ethernet header size. Therefor outgoing ipv6 packets cannot correctly be received. In ipv6 these two fields are updated by the function uip_arp_out. However this function doesn't exist in ipv6, therefore net_driver_ethernet_send has to take care of the ethernet header. Change-Id: Ib883a6553786d74dd2a5bca6893a0501f04ce7f4 Signed-off-by: Sebastien Griffoul <sebastien.griffoul@intel.com>
149 lines
3.2 KiB
C
149 lines
3.2 KiB
C
/* net_driver_ethernet.c - Ethernet driver */
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/*
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* Copyright (c) 2015 Intel Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <nanokernel.h>
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#include <toolchain.h>
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#include <string.h>
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#include <errno.h>
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#include <stdbool.h>
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#if defined(CONFIG_STDOUT_CONSOLE)
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#include <stdio.h>
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#define PRINT printf
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#else
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#include <misc/printk.h>
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#define PRINT printk
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#endif
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#include <net/net_core.h>
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#include "net_driver_ethernet.h"
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#include "contiki/ipv4/uip_arp.h"
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static bool opened;
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static ethernet_tx_callback tx_cb;
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void net_driver_ethernet_register_tx(ethernet_tx_callback cb)
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{
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tx_cb = cb;
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}
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static int net_driver_ethernet_open(void)
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{
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NET_DBG("Initialized Ethernet driver\n");
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opened = true;
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return 0;
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}
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bool net_driver_ethernet_is_opened(void)
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{
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return opened;
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}
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static int net_driver_ethernet_send(struct net_buf *buf)
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{
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#ifdef CONFIG_NETWORKING_WITH_IPV6
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struct uip_eth_hdr *eth_hdr = (struct uip_eth_hdr *)uip_buf(buf);
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#endif
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int res;
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NET_DBG("Sending %d bytes\n", buf->len);
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if (!tx_cb) {
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NET_ERR("Ethernet transmit callback is uninitialized.\n");
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return -1;
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}
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#ifdef CONFIG_NETWORKING_WITH_IPV4
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/* Note that uip_arp_out overwrites the outgoing packet if it needs to
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* send an ARP request. It relies on higher layers to resend the
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* original packet if necessary.
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*/
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uip_arp_out(buf);
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#else
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memcpy(eth_hdr->dest.addr, ip_buf_ll_dest(buf).u8, UIP_LLADDR_LEN);
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memcpy(eth_hdr->src.addr, uip_lladdr.addr, UIP_LLADDR_LEN);
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eth_hdr->type = UIP_HTONS(UIP_ETHTYPE_IPV6);
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uip_len(buf) += sizeof(struct uip_eth_hdr);
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#endif
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res = tx_cb(buf);
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if (res == 1) {
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/* Release the buffer because we sent all the data
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* successfully.
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*/
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ip_buf_unref(buf);
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}
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return res;
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}
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void net_driver_ethernet_recv(struct net_buf *buf)
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{
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#ifdef CONFIG_NETWORKING_WITH_IPV4
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struct uip_eth_hdr *eth_hdr = (struct uip_eth_hdr *)uip_buf(buf);
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if (eth_hdr->type == uip_htons(UIP_ETHTYPE_ARP)) {
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uip_arp_arpin(buf);
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/* If uip_arp_arpin needs to send an ARP response, it
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* overwrites the contents of buf and updates its
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* length variable. Otherwise, it zeroes out the
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* length variable.
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*/
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if (uip_len(buf) == 0) {
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ip_buf_unref(buf);
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return;
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}
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if (!tx_cb) {
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NET_ERR("Ethernet transmit callback is uninitialized.\n");
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ip_buf_unref(buf);
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return;
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}
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if (tx_cb(buf) != 1) {
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NET_ERR("Failed to send ARP response.\n");
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}
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ip_buf_unref(buf);
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} else
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#endif
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if (net_recv(buf) != 0) {
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NET_ERR("Unexpected return value from net_recv.\n");
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ip_buf_unref(buf);
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}
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}
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static struct net_driver net_driver_ethernet = {
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.head_reserve = 0,
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.open = net_driver_ethernet_open,
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.send = net_driver_ethernet_send,
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};
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int net_driver_ethernet_init(void)
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{
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net_register_driver(&net_driver_ethernet);
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return 0;
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}
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