[PATCH bpf-next v4 05/16] bpf: Make bpf_skb_vlan_pop helper metadata-safe
From: Jakub Sitnicki <jakub@cloudflare.com>
Date: 2025-11-05 20:19:58
Also in:
bpf
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Use the metadata-aware helper to move packet bytes after skb_pull(), ensuring metadata remains valid after calling the BPF helper. Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com> --- include/linux/if_vlan.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index afa5cc61a0fa..4ecc2509b0d4 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h@@ -738,9 +738,9 @@ static inline void vlan_remove_tag(struct sk_buff *skb, u16 *vlan_tci) *vlan_tci = ntohs(vhdr->h_vlan_TCI); - memmove(skb->data + VLAN_HLEN, skb->data, 2 * ETH_ALEN); vlan_set_encap_proto(skb, vhdr); __skb_pull(skb, VLAN_HLEN); + skb_postpull_data_move(skb, VLAN_HLEN, 2 * ETH_ALEN); } /**
--
2.43.0