fb11e647
 vrobic
reseau statique a...
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/*
* Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @{
* @ingroup net
* @file
* @brief gnrc netdev2 ethernet glue code
*
* @author Kaspar Schleiser <kaspar@schleiser.de>
* @}
*/
#include "net/gnrc.h"
#include "net/gnrc/netdev2.h"
#include "net/ethernet/hdr.h"
#ifdef MODULE_GNRC_IPV6
#include "net/ipv6/hdr.h"
#endif
#include "od.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
static gnrc_pktsnip_t *_recv(gnrc_netdev2_t *gnrc_netdev2)
{
netdev2_t *dev = gnrc_netdev2->dev;
int bytes_expected = dev->driver->recv(dev, NULL, 0, NULL);
gnrc_pktsnip_t *pkt = NULL;
if (bytes_expected > 0) {
pkt = gnrc_pktbuf_add(NULL, NULL,
bytes_expected,
GNRC_NETTYPE_UNDEF);
if(!pkt) {
DEBUG("_recv_ethernet_packet: cannot allocate pktsnip.\n");
/* drop the packet */
dev->driver->recv(dev, NULL, bytes_expected, NULL);
goto out;
}
int nread = dev->driver->recv(dev, pkt->data, bytes_expected, NULL);
if(nread <= 0) {
DEBUG("_recv_ethernet_packet: read error.\n");
goto safe_out;
}
if (nread < bytes_expected) {
/* we've got less then the expected packet size,
* so free the unused space.*/
DEBUG("_recv_ethernet_packet: reallocating.\n");
gnrc_pktbuf_realloc_data(pkt, nread);
}
/* mark ethernet header */
gnrc_pktsnip_t *eth_hdr = gnrc_pktbuf_mark(pkt, sizeof(ethernet_hdr_t), GNRC_NETTYPE_UNDEF);
if (!eth_hdr) {
DEBUG("gnrc_netdev2_eth: no space left in packet buffer\n");
goto safe_out;
}
ethernet_hdr_t *hdr = (ethernet_hdr_t *)eth_hdr->data;
/* set payload type from ethertype */
pkt->type = gnrc_nettype_from_ethertype(byteorder_ntohs(hdr->type));
/* create netif header */
gnrc_pktsnip_t *netif_hdr;
netif_hdr = gnrc_pktbuf_add(NULL, NULL,
sizeof(gnrc_netif_hdr_t) + (2 * ETHERNET_ADDR_LEN),
GNRC_NETTYPE_NETIF);
if (netif_hdr == NULL) {
DEBUG("gnrc_netdev2_eth: no space left in packet buffer\n");
pkt = eth_hdr;
goto safe_out;
}
gnrc_netif_hdr_init(netif_hdr->data, ETHERNET_ADDR_LEN, ETHERNET_ADDR_LEN);
gnrc_netif_hdr_set_src_addr(netif_hdr->data, hdr->src, ETHERNET_ADDR_LEN);
gnrc_netif_hdr_set_dst_addr(netif_hdr->data, hdr->dst, ETHERNET_ADDR_LEN);
((gnrc_netif_hdr_t *)netif_hdr->data)->if_pid = thread_getpid();
DEBUG("gnrc_netdev2_eth: received packet from %02x:%02x:%02x:%02x:%02x:%02x "
"of length %d\n",
hdr->src[0], hdr->src[1], hdr->src[2], hdr->src[3], hdr->src[4],
hdr->src[5], nread);
#if defined(MODULE_OD) && ENABLE_DEBUG
od_hex_dump(hdr, nread, OD_WIDTH_DEFAULT);
#endif
gnrc_pktbuf_remove_snip(pkt, eth_hdr);
LL_APPEND(pkt, netif_hdr);
}
out:
return pkt;
safe_out:
gnrc_pktbuf_release(pkt);
return NULL;
}
static inline void _addr_set_broadcast(uint8_t *dst)
{
memset(dst, 0xff, ETHERNET_ADDR_LEN);
}
static inline void _addr_set_multicast(uint8_t *dst, gnrc_pktsnip_t *payload)
{
switch (payload->type) {
#ifdef MODULE_GNRC_IPV6
case GNRC_NETTYPE_IPV6:
/* https://tools.ietf.org/html/rfc2464#section-7 */
dst[0] = 0x33;
dst[1] = 0x33;
ipv6_hdr_t *ipv6 = payload->data;
memcpy(dst + 2, ipv6->dst.u8 + 12, 4);
break;
#endif
default:
_addr_set_broadcast(dst);
break;
}
}
static int _send(gnrc_netdev2_t *gnrc_netdev2, gnrc_pktsnip_t *pkt)
{
ethernet_hdr_t hdr;
gnrc_netif_hdr_t *netif_hdr;
gnrc_pktsnip_t *payload;
int res;
netdev2_t *dev = gnrc_netdev2->dev;
if (pkt == NULL) {
DEBUG("gnrc_netdev2_eth: pkt was NULL\n");
return -EINVAL;
}
payload = pkt->next;
if (pkt->type != GNRC_NETTYPE_NETIF) {
DEBUG("gnrc_netdev2_eth: First header was not generic netif header\n");
return -EBADMSG;
}
if (payload) {
hdr.type = byteorder_htons(gnrc_nettype_to_ethertype(payload->type));
}
else {
hdr.type = byteorder_htons(ETHERTYPE_UNKNOWN);
}
netif_hdr = pkt->data;
/* set ethernet header */
if (netif_hdr->src_l2addr_len == ETHERNET_ADDR_LEN) {
memcpy(hdr.dst, gnrc_netif_hdr_get_src_addr(netif_hdr),
netif_hdr->src_l2addr_len);
}
else {
dev->driver->get(dev, NETOPT_ADDRESS, hdr.src, ETHERNET_ADDR_LEN);
}
if (netif_hdr->flags & GNRC_NETIF_HDR_FLAGS_BROADCAST) {
_addr_set_broadcast(hdr.dst);
}
else if (netif_hdr->flags & GNRC_NETIF_HDR_FLAGS_MULTICAST) {
if (payload == NULL) {
DEBUG("gnrc_netdev2_eth: empty multicast packets over Ethernet "\
"are not yet supported\n");
return -ENOTSUP;
}
_addr_set_multicast(hdr.dst, payload);
}
else if (netif_hdr->dst_l2addr_len == ETHERNET_ADDR_LEN) {
memcpy(hdr.dst, gnrc_netif_hdr_get_dst_addr(netif_hdr),
ETHERNET_ADDR_LEN);
}
else {
DEBUG("gnrc_netdev2_eth: destination address had unexpected format\n");
return -EBADMSG;
}
DEBUG("gnrc_netdev2_eth: send to %02x:%02x:%02x:%02x:%02x:%02x\n",
hdr.dst[0], hdr.dst[1], hdr.dst[2],
hdr.dst[3], hdr.dst[4], hdr.dst[5]);
size_t n;
payload = gnrc_pktbuf_get_iovec(pkt, &n); /* use payload as temporary
* variable */
res = -ENOBUFS;
if (payload != NULL) {
pkt = payload; /* reassign for later release; vec_snip is prepended to pkt */
struct iovec *vector = (struct iovec *)pkt->data;
vector[0].iov_base = (char*)&hdr;
vector[0].iov_len = sizeof(ethernet_hdr_t);
#ifdef MODULE_NETSTATS_L2
if ((netif_hdr->flags & GNRC_NETIF_HDR_FLAGS_BROADCAST) ||
(netif_hdr->flags & GNRC_NETIF_HDR_FLAGS_MULTICAST)) {
gnrc_netdev2->dev->stats.tx_mcast_count++;
}
else {
gnrc_netdev2->dev->stats.tx_unicast_count++;
}
#endif
res = dev->driver->send(dev, vector, n);
}
gnrc_pktbuf_release(pkt);
return res;
}
int gnrc_netdev2_eth_init(gnrc_netdev2_t *gnrc_netdev2, netdev2_t *dev)
{
gnrc_netdev2->send = _send;
gnrc_netdev2->recv = _recv;
gnrc_netdev2->dev = dev;
return 0;
}
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