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gnrc_sock_udp: provide port for sock_udp

pr/spi.typo
Martine Lenders 6 years ago committed by Martine Lenders
parent
commit
b971c575ad
  1. 13
      Makefile.dep
  2. 5
      Makefile.pseudomodules
  3. 6
      sys/Makefile.include
  4. 9
      sys/net/gnrc/Makefile
  5. 3
      sys/net/gnrc/sock/Makefile
  6. 197
      sys/net/gnrc/sock/gnrc_sock.c
  7. 99
      sys/net/gnrc/sock/include/gnrc_sock_internal.h
  8. 70
      sys/net/gnrc/sock/include/sock_types.h
  9. 3
      sys/net/gnrc/sock/udp/Makefile
  10. 277
      sys/net/gnrc/sock/udp/gnrc_sock_udp.c

13
Makefile.dep

@ -57,6 +57,19 @@ ifneq (,$(filter gnrc_conn_udp,$(USEMODULE)))
USEMODULE += gnrc_udp
endif
ifneq (,$(filter gnrc_sock_%,$(USEMODULE)))
USEMODULE += gnrc_sock
endif
ifneq (,$(filter gnrc_sock_udp,$(USEMODULE)))
USEMODULE += gnrc_udp
USEMODULE += random # to generate random ports
endif
ifneq (,$(filter gnrc_sock,$(USEMODULE)))
USEMODULE += gnrc_netapi_mbox
endif
ifneq (,$(filter gnrc_netapi_mbox,$(USEMODULE)))
USEMODULE += core_mbox
endif

5
Makefile.pseudomodules

@ -21,6 +21,7 @@ PSEUDOMODULES += gnrc_sixlowpan_iphc_nhc
PSEUDOMODULES += gnrc_sixlowpan_nd_border_router
PSEUDOMODULES += gnrc_sixlowpan_router
PSEUDOMODULES += gnrc_sixlowpan_router_default
PSEUDOMODULES += gnrc_sock_check_reuse
PSEUDOMODULES += log
PSEUDOMODULES += log_printfnoformat
PSEUDOMODULES += lwip_arp
@ -51,6 +52,10 @@ PSEUDOMODULES += saul_adc
PSEUDOMODULES += saul_default
PSEUDOMODULES += saul_gpio
PSEUDOMODULES += schedstatistics
PSEUDOMODULES += sock
PSEUDOMODULES += sock_ip
PSEUDOMODULES += sock_tcp
PSEUDOMODULES += sock_udp
# include variants of the AT86RF2xx drivers as pseudo modules
PSEUDOMODULES += at86rf23%

6
sys/Makefile.include

@ -9,6 +9,12 @@ endif
ifneq (,$(filter fib,$(USEMODULE)))
USEMODULE_INCLUDES += $(RIOTBASE)/sys/posix/include
endif
ifneq (,$(filter gnrc_sock,$(USEMODULE)))
USEMODULE_INCLUDES += $(RIOTBASE)/sys/net/gnrc/sock/include
ifneq (,$(filter gnrc_ipv6,$(USEMODULE)))
CFLAGS += -DSOCK_HAS_IPV6
endif
endif
ifneq (,$(filter posix,$(USEMODULE)))
USEMODULE_INCLUDES += $(RIOTBASE)/sys/posix/include
endif

9
sys/net/gnrc/Makefile

@ -112,6 +112,15 @@ endif
ifneq (,$(filter gnrc_slip,$(USEMODULE)))
DIRS += link_layer/slip
endif
ifneq (,$(filter gnrc_sock,$(USEMODULE)))
DIRS += sock
endif
ifneq (,$(filter gnrc_sock_ip,$(USEMODULE)))
DIRS += sock/ip
endif
ifneq (,$(filter gnrc_sock_udp,$(USEMODULE)))
DIRS += sock/udp
endif
ifneq (,$(filter gnrc_udp,$(USEMODULE)))
DIRS += transport_layer/udp
endif

3
sys/net/gnrc/sock/Makefile

@ -0,0 +1,3 @@
MODULE = gnrc_sock
include $(RIOTBASE)/Makefile.base

197
sys/net/gnrc/sock/gnrc_sock.c

@ -0,0 +1,197 @@
/*
* Copyright (C) 2016 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
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#include <errno.h>
#include "net/af.h"
#include "net/ipv6/hdr.h"
#include "net/gnrc/ipv6/hdr.h"
#include "net/gnrc/ipv6/netif.h"
#include "net/gnrc/netreg.h"
#include "net/udp.h"
#include "utlist.h"
#include "xtimer.h"
#include "sock_types.h"
#include "gnrc_sock_internal.h"
#ifdef MODULE_XTIMER
#define _TIMEOUT_MAGIC (0xF38A0B63U)
#define _TIMEOUT_MSG_TYPE (0x8474)
static void _callback_put(void *arg)
{
msg_t timeout_msg = { .sender_pid = KERNEL_PID_UNDEF,
.type = _TIMEOUT_MSG_TYPE,
.content = { .value = _TIMEOUT_MAGIC } };
gnrc_sock_reg_t *reg = arg;
/* should be safe, because otherwise if mbox were filled this callback is
* senseless */
mbox_try_put(&reg->mbox, &timeout_msg);
}
#endif
void gnrc_sock_create(gnrc_sock_reg_t *reg, gnrc_nettype_t type, uint32_t demux_ctx)
{
mbox_init(&reg->mbox, reg->mbox_queue, SOCK_MBOX_SIZE);
gnrc_netreg_entry_init_mbox(&reg->entry, demux_ctx, &reg->mbox);
gnrc_netreg_register(type, &reg->entry);
}
ssize_t gnrc_sock_recv(gnrc_sock_reg_t *reg, gnrc_pktsnip_t **pkt_out,
uint32_t timeout, sock_ip_ep_t *remote)
{
gnrc_pktsnip_t *pkt, *ip, *netif;
msg_t msg;
#ifdef MODULE_XTIMER
xtimer_t timeout_timer;
if ((timeout != SOCK_NO_TIMEOUT) && (timeout != 0)) {
timeout_timer.callback = _callback_put;
timeout_timer.arg = reg;
xtimer_set(&timeout_timer, timeout);
}
#endif
if (timeout != 0) {
mbox_get(&reg->mbox, &msg);
}
else {
if (!mbox_try_get(&reg->mbox, &msg)) {
return -EAGAIN;
}
}
#ifdef MODULE_XTIMER
xtimer_remove(&timeout_timer);
#endif
switch (msg.type) {
case GNRC_NETAPI_MSG_TYPE_RCV:
pkt = msg.content.ptr;
break;
#ifdef MODULE_XTIMER
case _TIMEOUT_MSG_TYPE:
if (msg.content.value == _TIMEOUT_MAGIC) {
return -ETIMEDOUT;
}
#endif
default:
return -EINTR;
}
/* TODO: discern NETTYPE from remote->family (set in caller), when IPv4
* was implemented */
ipv6_hdr_t *ipv6_hdr;
ip = gnrc_pktsnip_search_type(pkt, GNRC_NETTYPE_IPV6);
assert((ip != NULL) && (ip->size >= 40));
ipv6_hdr = ip->data;
memcpy(&remote->addr, &ipv6_hdr->src, sizeof(ipv6_addr_t));
remote->family = AF_INET6;
netif = gnrc_pktsnip_search_type(pkt, GNRC_NETTYPE_NETIF);
if (netif == NULL) {
remote->netif = SOCK_ADDR_ANY_NETIF;
}
else {
gnrc_netif_hdr_t *netif_hdr = netif->data;
/* TODO: use API in #5511 */
remote->netif = (uint16_t)netif_hdr->if_pid;
}
*pkt_out = pkt; /* set out parameter */
return 0;
}
ssize_t gnrc_sock_send(gnrc_pktsnip_t *payload, sock_ip_ep_t *local,
const sock_ip_ep_t *remote, uint8_t nh)
{
gnrc_pktsnip_t *pkt;
kernel_pid_t iface = KERNEL_PID_UNDEF;
gnrc_nettype_t type;
size_t payload_len = gnrc_pkt_len(payload);
if (local->family != remote->family) {
gnrc_pktbuf_release(payload);
return -EAFNOSUPPORT;
}
switch (local->family) {
#ifdef SOCK_HAS_IPV6
case AF_INET6: {
ipv6_hdr_t *hdr;
pkt = gnrc_ipv6_hdr_build(payload, (ipv6_addr_t *)&local->addr.ipv6,
(ipv6_addr_t *)&remote->addr.ipv6);
if (pkt == NULL) {
return -ENOMEM;
}
if (payload->type == GNRC_NETTYPE_UNDEF) {
payload->type = GNRC_NETTYPE_IPV6;
type = GNRC_NETTYPE_IPV6;
}
else {
type = payload->type;
}
hdr = pkt->data;
hdr->nh = nh;
break;
}
#endif
default:
(void)nh;
gnrc_pktbuf_release(payload);
return -EAFNOSUPPORT;
}
if (local->netif != SOCK_ADDR_ANY_NETIF) {
/* TODO: use API in #5511 */
iface = (kernel_pid_t)local->netif;
}
else if (remote->netif != SOCK_ADDR_ANY_NETIF) {
/* TODO: use API in #5511 */
iface = (kernel_pid_t)remote->netif;
}
if (iface != KERNEL_PID_UNDEF) {
gnrc_pktsnip_t *netif = gnrc_netif_hdr_build(NULL, 0, NULL, 0);
gnrc_netif_hdr_t *netif_hdr;
if (netif == NULL) {
gnrc_pktbuf_release(pkt);
return -ENOMEM;
}
netif_hdr = netif->data;
netif_hdr->if_pid = iface;
LL_PREPEND(pkt, netif);
}
#ifdef MODULE_GNRC_NETERR
gnrc_neterr_reg(pkt); /* no error should occur since pkt was created here */
#endif
if (!gnrc_netapi_dispatch_send(type, GNRC_NETREG_DEMUX_CTX_ALL, pkt)) {
/* this should not happen, but just in case */
gnrc_pktbuf_release(pkt);
return -EBADMSG;
}
#ifdef MODULE_GNRC_NETERR
msg_t err_report;
err_report.type = 0;
while (err_report.type != GNRC_NETERR_MSG_TYPE) {
msg_try_receive(err_report);
if (err_report.type != GNRC_NETERR_MSG_TYPE) {
msg_try_send(err_report, sched_active_pid);
}
}
if (err_report.content.value != GNRC_NETERR_SUCCESS) {
return (int)(-err_report.content.value);
}
#endif
return payload_len;
}
/** @} */

99
sys/net/gnrc/sock/include/gnrc_sock_internal.h

@ -0,0 +1,99 @@
/*
* Copyright (C) 2016 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.
*/
/**
* @defgroup net_gnrc_sock GNRC-specific implementation of the sock API
* @ingroup net_gnrc
* @brief Provides an implementation of the @ref net_sock by the
* @ref net_gnrc
*
* @{
*
* @file
* @brief GNRC-specific types and function definitions
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#ifndef GNRC_SOCK_INTERNAL_H_
#define GNRC_SOCK_INTERNAL_H_
#include <stdbool.h>
#include <stdint.h>
#include "mbox.h"
#include "net/af.h"
#include "net/gnrc.h"
#include "net/gnrc/netreg.h"
#include "net/sock/ip.h"
#include "sock_types.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Internal helper functions for GNRC
* @internal
* @{
*/
/**
* @brief Checks if address family is not supported
* @internal
*/
static inline bool gnrc_af_not_supported(int af)
{
/* TODO: add AF_INET support */
return (af != AF_INET6);
}
/**
* @brief Check if end point points to any address
* @internal
*/
static inline bool gnrc_ep_addr_any(const sock_ip_ep_t *ep)
{
assert(ep != NULL);
const uint8_t *p = (uint8_t *)&ep->addr;
for (uint8_t i = 0; i < sizeof(ep->addr); i++) {
if (p[i] != 0) {
return false;
}
}
return true;
}
/**
* @brief Create a sock internally
* @internal
*/
void gnrc_sock_create(gnrc_sock_reg_t *reg, gnrc_nettype_t type, uint32_t demux_ctx);
/**
* @brief Receive a packet internally
* @internal
*/
ssize_t gnrc_sock_recv(gnrc_sock_reg_t *reg, gnrc_pktsnip_t **pkt, uint32_t timeout,
sock_ip_ep_t *remote);
/**
* @brief Send a packet internally
* @internal
*/
ssize_t gnrc_sock_send(gnrc_pktsnip_t *payload, sock_ip_ep_t *local,
const sock_ip_ep_t *remote, uint8_t nh);
/**
* @}
*/
#ifdef __cplusplus
}
#endif
#endif /* GNRC_SOCK_INTERNAL_H_ */
/** @} */

70
sys/net/gnrc/sock/include/sock_types.h

@ -0,0 +1,70 @@
/*
* Copyright (C) 2016 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.
*/
/**
* @defgroup net_gnrc_sock GNRC-specific implementation of the sock API
* @ingroup net_gnrc
* @brief Provides an implementation of the @ref net_sock by the
* @ref net_gnrc
*
* @{
*
* @file
* @brief GNRC-specific types and function definitions
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#ifndef SOCK_TYPES_H_
#define SOCK_TYPES_H_
#include <stdbool.h>
#include <stdint.h>
#include "mbox.h"
#include "net/gnrc.h"
#include "net/gnrc/netreg.h"
#include "net/sock/ip.h"
#include "net/sock/udp.h"
#ifdef __cplusplus
extern "C" {
#endif
#ifndef SOCK_MBOX_SIZE
#define SOCK_MBOX_SIZE (8) /**< Size for gnrc_sock_reg_t::mbox_queue */
#endif
/**
* @brief sock @ref net_gnrc_netreg info
* @internal
*/
typedef struct gnrc_sock_reg {
#ifdef MODULE_GNRC_SOCK_CHECK_REUSE
struct gnrc_sock_reg *next; /**< list-like for internal storage */
#endif
gnrc_netreg_entry_t entry; /**< @ref net_gnrc_netreg entry for mbox */
mbox_t mbox; /**< @ref core_mbox target for the sock */
msg_t mbox_queue[SOCK_MBOX_SIZE]; /**< queue for gnrc_sock_reg_t::mbox */
} gnrc_sock_reg_t;
/**
* @brief UDP sock type
* @internal
*/
struct sock_udp {
gnrc_sock_reg_t reg; /**< netreg info */
sock_udp_ep_t local; /**< local end-point */
sock_udp_ep_t remote; /**< remote end-point */
uint16_t flags; /**< option flags */
};
#ifdef __cplusplus
}
#endif
#endif /* SOCK_TYPES_H_ */
/** @} */

3
sys/net/gnrc/sock/udp/Makefile

@ -0,0 +1,3 @@
MODULE = gnrc_sock_udp
include $(RIOTBASE)/Makefile.base

277
sys/net/gnrc/sock/udp/gnrc_sock_udp.c

@ -0,0 +1,277 @@
/*
* 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
* @brief GNRC implementation of @ref net_sock_udp
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#include <errno.h>
#include "byteorder.h"
#include "net/af.h"
#include "net/protnum.h"
#include "net/gnrc/ipv6.h"
#include "net/gnrc/udp.h"
#include "net/sock/udp.h"
#include "net/udp.h"
#include "random.h"
#include "gnrc_sock_internal.h"
#ifdef MODULE_GNRC_SOCK_CHECK_REUSE
static sock_udp_t *_udp_socks = NULL;
#endif
int sock_udp_create(sock_udp_t *sock, const sock_udp_ep_t *local,
const sock_udp_ep_t *remote, uint16_t flags)
{
assert(sock);
assert(local == NULL || local->port != 0);
assert(remote == NULL || remote->port != 0);
if ((local != NULL) && (remote != NULL) &&
(local->netif != SOCK_ADDR_ANY_NETIF) &&
(remote->netif != SOCK_ADDR_ANY_NETIF) &&
(local->netif != remote->netif)) {
return -EINVAL;
}
memset(&sock->local, 0, sizeof(sock_udp_ep_t));
if (local != NULL) {
#ifdef MODULE_GNRC_SOCK_CHECK_REUSE
if (!(flags & SOCK_FLAGS_REUSE_EP)) {
for (sock_udp_t *ptr = _udp_socks; ptr != NULL;
ptr = (sock_udp_t *)ptr->reg.next) {
if (memcmp(&ptr->local, local, sizeof(sock_udp_ep_t)) == 0) {
return -EADDRINUSE;
}
}
}
/* prepend to current socks */
sock->reg.next = (gnrc_sock_reg_t *)_udp_socks;
_udp_socks = sock;
#endif
if (gnrc_af_not_supported(local->family)) {
return -EAFNOSUPPORT;
}
memcpy(&sock->local, local, sizeof(sock_udp_ep_t));
}
memset(&sock->remote, 0, sizeof(sock_udp_ep_t));
if (remote != NULL) {
if (gnrc_af_not_supported(remote->family)) {
return -EAFNOSUPPORT;
}
if (gnrc_ep_addr_any((const sock_ip_ep_t *)remote)) {
return -EINVAL;
}
memcpy(&sock->remote, remote, sizeof(sock_udp_ep_t));
}
if (local != NULL) {
/* listen only with local given */
gnrc_sock_create(&sock->reg, GNRC_NETTYPE_UDP,
local->port);
}
sock->flags = flags;
return 0;
}
void sock_udp_close(sock_udp_t *sock)
{
assert(sock != NULL);
gnrc_netreg_unregister(GNRC_NETTYPE_UDP, &sock->reg.entry);
#ifdef MODULE_GNRC_SOCK_CHECK_REUSE
if (_udp_socks != NULL) {
gnrc_sock_reg_t *head = (gnrc_sock_reg_t *)_udp_socks;
LL_DELETE(head, (gnrc_sock_reg_t *)sock);
}
#endif
}
int sock_udp_get_local(sock_udp_t *sock, sock_udp_ep_t *local)
{
assert(sock && local);
if (sock->local.family == AF_UNSPEC) {
return -EADDRNOTAVAIL;
}
memcpy(local, &sock->local, sizeof(sock_udp_ep_t));
return 0;
}
int sock_udp_get_remote(sock_udp_t *sock, sock_udp_ep_t *remote)
{
assert(sock && remote);
if (sock->remote.family == AF_UNSPEC) {
return -ENOTCONN;
}
memcpy(remote, &sock->remote, sizeof(sock_udp_ep_t));
return 0;
}
ssize_t sock_udp_recv(sock_udp_t *sock, void *data, size_t max_len,
uint32_t timeout, sock_udp_ep_t *remote)
{
gnrc_pktsnip_t *pkt, *udp;
udp_hdr_t *hdr;
sock_ip_ep_t tmp;
int res;
assert((sock != NULL) && (data != NULL) && (max_len > 0));
if (sock->local.family == AF_UNSPEC) {
return -EADDRNOTAVAIL;
}
tmp.family = sock->local.family;
res = gnrc_sock_recv((gnrc_sock_reg_t *)sock, &pkt, timeout, &tmp);
if (res < 0) {
return res;
}
if (pkt->size > max_len) {
gnrc_pktbuf_release(pkt);
return -ENOBUFS;
}
udp = gnrc_pktsnip_search_type(pkt, GNRC_NETTYPE_UDP);
assert(udp);
hdr = udp->data;
if (remote != NULL) {
/* return remote to possibly block if wrong remote */
memcpy(remote, &tmp, sizeof(tmp));
remote->port = byteorder_ntohs(hdr->src_port);
}
if ((sock->remote.family != AF_UNSPEC) && /* check remote end-point if set */
((sock->remote.port != byteorder_ntohs(hdr->src_port)) ||
/* We only have IPv6 for now, so just comparing the whole end point
* should suffice */
((memcmp(&sock->remote.addr, &ipv6_addr_unspecified,
sizeof(ipv6_addr_t)) != 0) &&
(memcmp(&sock->remote.addr, &tmp.addr, sizeof(ipv6_addr_t)) != 0)))) {
gnrc_pktbuf_release(pkt);
return -EPROTO;
}
memcpy(data, pkt->data, pkt->size);
gnrc_pktbuf_release(pkt);
return (int)pkt->size;
}
ssize_t sock_udp_send(sock_udp_t *sock, const void *data, size_t len,
const sock_udp_ep_t *remote)
{
int res;
gnrc_pktsnip_t *payload, *pkt;
uint16_t src_port = 0, dst_port;
sock_ip_ep_t local;
sock_ip_ep_t rem;
assert((sock != NULL) || (remote != NULL));
assert((len == 0) || (data != NULL)); /* (len != 0) => (data != NULL) */
if ((remote != NULL) && (sock != NULL) &&
(sock->local.netif != SOCK_ADDR_ANY_NETIF) &&
(remote->netif != SOCK_ADDR_ANY_NETIF) &&
(sock->local.netif != remote->netif)) {
return -EINVAL;
}
if ((remote != NULL) && ((remote->port == 0) ||
gnrc_ep_addr_any((const sock_ip_ep_t *)remote))) {
return -EINVAL;
}
if ((remote == NULL) &&
/* sock can't be NULL as per assertion above */
(sock->remote.port == AF_UNSPEC)) {
return -ENOTCONN;
}
/* compiler evaluates lazily so this isn't a redundundant check and cppcheck
* is being weird here anyways */
/* cppcheck-suppress nullPointerRedundantCheck */
/* cppcheck-suppress nullPointer */
if ((sock == NULL) || (sock->local.family == AF_UNSPEC)) {
/* no sock or sock currently unbound */
while (src_port == 0) {
src_port = (uint16_t)(random_uint32() & UINT16_MAX);
#ifdef MODULE_GNRC_SOCK_CHECK_REUSE
if ((sock == NULL) || !(sock->flags & SOCK_FLAGS_REUSE_EP)) {
/* check if port already registered somewhere */
for (sock_udp_t *ptr = _udp_socks; ptr != NULL;
ptr = (sock_udp_t *)ptr->reg.next) {
bool spec_addr = false;
for (unsigned i = 0; i < sizeof(ptr->local.addr); i++) {
const uint8_t *const p = (uint8_t *)&ptr->local.addr;
if (p[i] != 0) {
spec_addr = true;
}
}
if (spec_addr) {
continue;
}
if (ptr->local.port == src_port) {
/* we already have one of this port registered
* => generate a new one */
src_port = 0;
}
}
}
#endif
}
memset(&local, 0, sizeof(local));
if (sock != NULL) {
/* bind sock object implicitly */
sock->local.port = src_port;
#ifdef MODULE_GNRC_SOCK_CHECK_REUSE
/* prepend to current socks */
sock->reg.next = (gnrc_sock_reg_t *)_udp_socks;
_udp_socks = sock;
#endif
}
}
else {
src_port = sock->local.port;
memcpy(&local, &sock->local, sizeof(local));
}
if (remote == NULL) {
/* sock can't be NULL at this point */
memcpy(&rem, &sock->remote, sizeof(rem));
dst_port = sock->remote.port;
}
else {
memcpy(&rem, remote, sizeof(rem));
dst_port = remote->port;
}
if ((remote != NULL) && (remote->family == AF_UNSPEC) &&
(sock->remote.family != AF_UNSPEC)) {
/* remote was set on create so take its family */
rem.family = sock->remote.family;
}
else if ((remote != NULL) && gnrc_af_not_supported(remote->family)) {
return -EAFNOSUPPORT;
}
else if ((local.family == AF_UNSPEC) && (rem.family != AF_UNSPEC)) {
/* local was set to 0 above */
local.family = rem.family;
}
else if ((local.family != AF_UNSPEC) && (rem.family == AF_UNSPEC)) {
/* local was given on create, but remote family wasn't given by user and
* there was no remote given on create, take from local */
rem.family = local.family;
}
payload = gnrc_pktbuf_add(NULL, (void *)data, len, GNRC_NETTYPE_UNDEF);
if (payload == NULL) {
return -ENOMEM;
}
pkt = gnrc_udp_hdr_build(payload, src_port, dst_port);
if (pkt == NULL) {
gnrc_pktbuf_release(payload);
return -ENOMEM;
}
res = gnrc_sock_send(pkt, &local, &rem, PROTNUM_UDP);
if (res <= 0) {
return res;
}
return res - sizeof(udp_hdr_t);
}
/** @} */
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