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net: dhcpv4: set sntp ip via option

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Adds the option to set the ntp address ip via
dhcpv4 option 42 (Network Time Protocol Servers).

Signed-off-by: Fin Maaß <f.maass@vogl-electronic.com>
This commit is contained in:
Fin Maaß 2024-02-27 11:38:40 +01:00 committed by Fabio Baltieri
parent 2140a4af6a
commit 3be6557078
4 changed files with 43 additions and 0 deletions
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5
include/zephyr/net/net_if.h
View file

@ -430,6 +430,11 @@ struct net_if_dhcpv4 {
/** The source address of a received DHCP message */
struct in_addr response_src_addr;
#ifdef CONFIG_NET_DHCPV4_OPTION_NTP_SERVER
/** NTP server address */
struct in_addr ntp_addr;
#endif
};
#endif /* CONFIG_NET_DHCPV4 */

8
subsys/net/lib/dhcpv4/Kconfig
View file

@ -69,6 +69,14 @@ config NET_DHCPV4_VENDOR_CLASS_IDENTIFIER_STRING
The string to include in the DHCPv4 vendor class identifier option
in the DHCPv4 request.
config NET_DHCPV4_OPTION_NTP_SERVER
bool "Use NTP server from DHCPv4 option and save it in the net_if"
default y
depends on SNTP
help
If this option is set, then the NTP server can be set from the
DHCPv4 option.
endif # NET_DHCPV4
config NET_DHCPV4_SERVER

29
subsys/net/lib/dhcpv4/dhcpv4.c
View file

@ -52,6 +52,9 @@ static int unique_types_in_callbacks;
static const uint8_t min_req_options[] = {
DHCPV4_OPTIONS_SUBNET_MASK,
DHCPV4_OPTIONS_ROUTER,
#ifdef CONFIG_NET_DHCPV4_OPTION_NTP_SERVER
DHCPV4_OPTIONS_NTP_SERVER,
#endif
DHCPV4_OPTIONS_DNS_SERVER
};
@ -892,6 +895,32 @@ static bool dhcpv4_parse_options(struct net_pkt *pkt,
break;
}
#endif
#if defined(CONFIG_NET_DHCPV4_OPTION_NTP_SERVER)
case DHCPV4_OPTIONS_NTP_SERVER: {
/* NTP server option may present 1 or more
* addresses. Each 4 bytes in length. NTP
* servers should be listed in order
* of preference. Hence we choose the first
* and skip the rest.
*/
if (length % 4 != 0U) {
NET_ERR("options_log_server, bad length");
return false;
}
if (net_pkt_read(pkt, iface->config.dhcpv4.ntp_addr.s4_addr, 4) < 0 ||
net_pkt_skip(pkt, length - 4U) < 0) {
NET_ERR("options_ntp_server, short packet");
return false;
}
NET_DBG("options_ntp_server: %s",
net_sprint_ipv4_addr(&iface->config.dhcpv4.ntp_addr));
break;
}
#endif /* CONFIG_NET_DHCPV4_OPTION_NTP_SERVER */
case DHCPV4_OPTIONS_LEASE_TIME:
if (length != 4U) {
NET_ERR("options_lease_time, bad length");

1
subsys/net/lib/dhcpv4/dhcpv4_internal.h
View file

@ -55,6 +55,7 @@ struct dhcp_msg {
#define DHCPV4_OPTIONS_ROUTER 3
#define DHCPV4_OPTIONS_DNS_SERVER 6
#define DHCPV4_OPTIONS_HOST_NAME 12
#define DHCPV4_OPTIONS_NTP_SERVER 42
#define DHCPV4_OPTIONS_REQ_IPADDR 50
#define DHCPV4_OPTIONS_LEASE_TIME 51
#define DHCPV4_OPTIONS_MSG_TYPE 53