By using this " bpf_skb_load_bytes_relative()" helper function we can directly retrieve the Network header data fields, so we no need to check for L2-header VLAN presence.
Thanks, Madhuker. -----Original Message----- From: Stephen Hemminger <[email protected]> Sent: 05 January 2024 02:11 To: Madhuker Mythri <[email protected]> Cc: [email protected]; [email protected] Subject: [External] : Re: [PATCH] net/tap: Modified TAP BPF program as per the new Kernel-version upgrade requirements. On Thu, 4 Jan 2024 22:57:56 +0530 [email protected] wrote: > - /* Get correct proto for 802.1ad */ > - if (skb->vlan_present && skb->vlan_proto == htons(ETH_P_8021AD)) { > - if (data + ETH_ALEN * 2 + sizeof(struct vlan_hdr) + > - sizeof(proto) > data_end) > - return TC_ACT_OK; > - proto = *(__u16 *)(data + ETH_ALEN * 2 + > - sizeof(struct vlan_hdr)); > - off += sizeof(struct vlan_hdr); > - } Your version loses VLAN support?
