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net: sockets_offload: Allow to enable/disable DNS offload at runtime

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Add new socket offloading functions, allowing to enable/disable
offloaded DNS implementation at runtime. This may be useful if there is
a mix of offloaded/native network interfaces in the system, so the
application can choose which DNS backend to use.

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>
This commit is contained in:
Robert Lubos 2025-06-09 11:34:42 +02:00 • committed by Dan Kalowsky
commit b18bc7cc3e
3 changed files with 64 additions and 3 deletions
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33
include/zephyr/net/socket_offload.h
View file

@ -41,6 +41,39 @@ struct socket_dns_offload {
*/
void socket_offload_dns_register(const struct socket_dns_offload *ops);
/**
* @brief Deregister an offloaded socket DNS API interface.
*
* @param ops A pointer to the offloaded socket DNS API interface.
*
* @retval 0 On success
* @retval -EINVAL Offloaded DNS API was not regsitered.
*/
int socket_offload_dns_deregister(const struct socket_dns_offload *ops);
/**
* @brief Enable/disable DNS offloading at runtime.
*
* @param enable Whether to enable or disable the DNS offloading.
*/
void socket_offload_dns_enable(bool enable);
/**
* @brief Check if DNS offloading is enabled.
*
* @retval true DNS offloaded API is registered and enabled.
* @retval false DNS offloading is disabled.
*/
#if defined(CONFIG_NET_SOCKETS_OFFLOAD)
bool socket_offload_dns_is_enabled(void);
#else
static inline bool socket_offload_dns_is_enabled(void)
{
return false;
}
#endif /* defined(CONFIG_NET_SOCKETS_OFFLOAD) */
/** @cond INTERNAL_HIDDEN */
int socket_offload_getaddrinfo(const char *node, const char *service,

4
subsys/net/lib/sockets/getaddrinfo.c
View file

@ -433,7 +433,7 @@ int zsock_getaddrinfo(const char *host, const char *service,
const struct zsock_addrinfo *hints,
struct zsock_addrinfo **res)
{
if (IS_ENABLED(CONFIG_NET_SOCKETS_OFFLOAD)) {
if (socket_offload_dns_is_enabled()) {
return socket_offload_getaddrinfo(host, service, hints, res);
}
@ -471,7 +471,7 @@ int zsock_getaddrinfo(const char *host, const char *service,
void zsock_freeaddrinfo(struct zsock_addrinfo *ai)
{
if (IS_ENABLED(CONFIG_NET_SOCKETS_OFFLOAD)) {
if (socket_offload_dns_is_enabled()) {
socket_offload_freeaddrinfo(ai);
return;
}

30
subsys/net/lib/sockets/socket_offload.c
View file

@ -12,7 +12,8 @@ LOG_MODULE_REGISTER(net_socket_offload, CONFIG_NET_SOCKETS_LOG_LEVEL);
#include "sockets_internal.h"
const struct socket_dns_offload *dns_offload;
static const struct socket_dns_offload *dns_offload;
static bool dns_offload_enabled;
void socket_offload_dns_register(const struct socket_dns_offload *ops)
{
@ -20,6 +21,33 @@ void socket_offload_dns_register(const struct socket_dns_offload *ops)
__ASSERT_NO_MSG(dns_offload == NULL);
dns_offload = ops;
socket_offload_dns_enable(true);
}
int socket_offload_dns_deregister(const struct socket_dns_offload *ops)
{
__ASSERT_NO_MSG(ops != NULL);
if (dns_offload != ops) {
return -EINVAL;
}
dns_offload = NULL;
socket_offload_dns_enable(false);
return 0;
}
void socket_offload_dns_enable(bool enable)
{
dns_offload_enabled = enable;
}
bool socket_offload_dns_is_enabled(void)
{
return (dns_offload != NULL) && dns_offload_enabled;
}
int socket_offload_getaddrinfo(const char *node, const char *service,