gnrc_netreg.c
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/*
* Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.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.
*/
/**
* @{
*
* @file
*/
#include <errno.h>
#include <string.h>
#include "assert.h"
#include "utlist.h"
#include "net/gnrc/netreg.h"
#include "net/gnrc/nettype.h"
#include "net/gnrc/pkt.h"
#include "net/gnrc/icmpv6.h"
#include "net/gnrc/ipv6.h"
#include "net/gnrc/udp.h"
#include "net/gnrc/tcp.h"
#define _INVALID_TYPE(type) (((type) < GNRC_NETTYPE_UNDEF) || ((type) >= GNRC_NETTYPE_NUMOF))
/* The registry as lookup table by gnrc_nettype_t */
static gnrc_netreg_entry_t *netreg[GNRC_NETTYPE_NUMOF];
void gnrc_netreg_init(void)
{
/* set all pointers in registry to NULL */
memset(netreg, 0, GNRC_NETTYPE_NUMOF * sizeof(gnrc_netreg_entry_t *));
}
int gnrc_netreg_register(gnrc_nettype_t type, gnrc_netreg_entry_t *entry)
{
#if defined(MODULE_GNRC_NETAPI_MBOX) || defined(MODULE_GNRC_NETAPI_CALLBACKS)
#ifdef DEVELHELP
/* only threads with a message queue are allowed to register at gnrc */
assert((entry->type != GNRC_NETREG_TYPE_DEFAULT) ||
sched_threads[entry->target.pid]->msg_array);
#endif
#else
/* only threads with a message queue are allowed to register at gnrc */
assert(sched_threads[entry->target.pid]->msg_array);
#endif
if (_INVALID_TYPE(type)) {
return -EINVAL;
}
LL_PREPEND(netreg[type], entry);
return 0;
}
void gnrc_netreg_unregister(gnrc_nettype_t type, gnrc_netreg_entry_t *entry)
{
if (_INVALID_TYPE(type)) {
return;
}
LL_DELETE(netreg[type], entry);
}
gnrc_netreg_entry_t *gnrc_netreg_lookup(gnrc_nettype_t type, uint32_t demux_ctx)
{
gnrc_netreg_entry_t *res;
if (_INVALID_TYPE(type)) {
return NULL;
}
LL_SEARCH_SCALAR(netreg[type], res, demux_ctx, demux_ctx);
return res;
}
int gnrc_netreg_num(gnrc_nettype_t type, uint32_t demux_ctx)
{
int num = 0;
gnrc_netreg_entry_t *entry;
if (_INVALID_TYPE(type)) {
return 0;
}
entry = netreg[type];
while (entry != NULL) {
if (entry->demux_ctx == demux_ctx) {
num++;
}
entry = entry->next;
}
return num;
}
gnrc_netreg_entry_t *gnrc_netreg_getnext(gnrc_netreg_entry_t *entry)
{
uint32_t demux_ctx;
if (entry == NULL) {
return NULL;
}
demux_ctx = entry->demux_ctx;
LL_SEARCH_SCALAR(entry->next, entry, demux_ctx, demux_ctx);
return entry;
}
int gnrc_netreg_calc_csum(gnrc_pktsnip_t *hdr, gnrc_pktsnip_t *pseudo_hdr)
{
if (pseudo_hdr == NULL) {
/* XXX: Might be allowed for future checksums.
* If this is the case: move this to the branches were it
* is needed. */
return -EINVAL;
}
switch (hdr->type) {
#ifdef MODULE_GNRC_ICMPV6
case GNRC_NETTYPE_ICMPV6:
return gnrc_icmpv6_calc_csum(hdr, pseudo_hdr);
#endif
#ifdef MODULE_GNRC_TCP
case GNRC_NETTYPE_TCP:
return gnrc_tcp_calc_csum(hdr, pseudo_hdr);
#endif
#ifdef MODULE_GNRC_UDP
case GNRC_NETTYPE_UDP:
return gnrc_udp_calc_csum(hdr, pseudo_hdr);
#endif
default:
return -ENOENT;
}
}
/** @} */