[PATCH 05/10] net: dns: use net_eth_to_udp() for packet parsing

[Sascha Hauer <s.hauer@pengutronix.de>]

Replace the separate net_eth_to_udp_payload() and net_eth_to_udplen()
calls with the new consolidated net_eth_to_udp() helper.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 net/dns.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/net/dns.c b/net/dns.c
index 8fbd13cdc3..8616e353c1 100644
--- a/net/dns.c
+++ b/net/dns.c
@@ -206,9 +206,12 @@ static void dns_recv(struct header *header, unsigned len)
 
 static void dns_handler(void *ctx, char *packet, unsigned len)
 {
-	(void)ctx;
-	dns_recv((struct header *)net_eth_to_udp_payload(packet),
-		net_eth_to_udplen(packet));
+	struct net_udp_pkt udp;
+
+	if (net_eth_to_udp(packet, len, &udp))
+		return;
+
+	dns_recv(udp.payload, udp.len);
 }
 
 int resolv(const char *host, IPaddr_t *ip)

-- 
2.47.3