[PATCH net-next v7 3/5] net: hdlc_fr: Do skb_reset_mac_header for skbs received on normal PVC devices
From: Xie He <hidden>
Date: 2020-10-31 18:11:48
Also in:
lkml
Subsystem:
generic hdlc (wan) drivers, networking drivers, the rest · Maintainers:
Krzysztof Halasa, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
When an skb is received on a normal (non-Ethernet-emulating) PVC device, call skb_reset_mac_header before we pass it to upper layers. This is because normal PVC devices don't have header_ops, so any header we have would not be visible to upper layer code when sending, so the header shouldn't be visible to upper layer code when receiving, either. Cc: Krzysztof Halasa <khc@pm.waw.pl> Cc: Willem de Bruijn <willemdebruijn.kernel@gmail.com> Signed-off-by: Xie He <redacted> --- drivers/net/wan/hdlc_fr.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/net/wan/hdlc_fr.c b/drivers/net/wan/hdlc_fr.c
index 71ee9b60d91b..eb83116aa9df 100644
--- a/drivers/net/wan/hdlc_fr.c
+++ b/drivers/net/wan/hdlc_fr.c@@ -935,6 +935,7 @@ static int fr_rx(struct sk_buff *skb) skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */ skb->dev = pvc->main; skb->protocol = htons(ETH_P_IP); + skb_reset_mac_header(skb); } else if (data[3] == NLPID_IPV6) { if (!pvc->main)
@@ -942,6 +943,7 @@ static int fr_rx(struct sk_buff *skb) skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */ skb->dev = pvc->main; skb->protocol = htons(ETH_P_IPV6); + skb_reset_mac_header(skb); } else if (skb->len > 10 && data[3] == FR_PAD && data[4] == NLPID_SNAP && data[5] == FR_PAD) {
@@ -958,6 +960,7 @@ static int fr_rx(struct sk_buff *skb) goto rx_drop; skb->dev = pvc->main; skb->protocol = htons(pid); + skb_reset_mac_header(skb); break; case 0x80C20007: /* bridged Ethernet frame */
--
2.27.0