[PATCH 04/10] fs: nfs: use net_eth_to_udp() for packet parsing

Sascha Hauer
2026-04-02T06:37:24Z

Replace net_eth_to_udp_payload() with the new consolidated
net_eth_to_udp() helper.

This also fixes a bug where the old code used the NIC-level frame
length (which includes ethernet, IP, and UDP headers) instead of the
UDP payload length when copying packet data.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
fs/nfs.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/fs/nfs.c b/fs/nfs.c
index 0b40c56ff3..39c92e4736 100644
--- a/fs/nfs.c
+++ b/fs/nfs.c
@@ -1193,13 +1193,16 @@ static int nfs_read_req(struct file_priv *priv, uint64_t offset,

static void nfs_handler(void *ctx, char *p, unsigned len)
{
- char *pkt = net_eth_to_udp_payload(p);
struct nfs_priv *npriv = ctx;
+ struct net_udp_pkt udp;
struct packet *packet;

- packet = xmalloc(sizeof(*packet) + len);
- memcpy(packet->data, pkt, len);
- packet->len = len;
+ if (net_eth_to_udp(p, len, &udp))
+ return;
+
+ packet = xmalloc(sizeof(*packet) + udp.len);
+ memcpy(packet->data, udp.payload, udp.len);
+ packet->len = udp.len;
packet->pos = 0;

list_add_tail(&packet->list, &npriv->packets);

--
2.47.3