1 /* SPDX-License-Identifier: GPL-2.0-or-later */
23  * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
31  * 	struct vlan_hdr - vlan header
32  * 	@h_vlan_TCI: priority and VLAN ID
33  *	@h_vlan_encapsulated_proto: packet type ID or len
41  *	struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr)
44  *	@h_vlan_proto: ethernet protocol
45  *	@h_vlan_TCI: priority and VLAN ID
46  *	@h_vlan_encapsulated_proto: packet type ID or len
74         return dev->priv_flags & IFF_802_1Q_VLAN;  in is_vlan_dev()
77 #define skb_vlan_tag_present(__skb)	((__skb)->vlan_present)
78 #define skb_vlan_tag_get(__skb)		((__skb)->vlan_tci)
79 #define skb_vlan_tag_get_id(__skb)	((__skb)->vlan_tci & VLAN_VID_MASK)
80 #define skb_vlan_tag_get_cfi(__skb)	(!!((__skb)->vlan_tci & VLAN_CFI_MASK))
81 #define skb_vlan_tag_get_prio(__skb)	(((__skb)->vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT)
108  *	struct vlan_pcpu_stats - VLAN percpu rx/tx stats
141  *	struct vlan_priority_tci_mapping - vlan egress priority mappings
143  *	@vlan_qos: vlan priority: (skb->priority << 13) & 0xE000
156  *	struct vlan_dev_priv - VLAN private device data
161  *	@vlan_proto: VLAN encapsulation protocol
201 	mp = vlan_dev_priv(dev)->egress_priority_map[(skprio & 0xF)];  in vlan_dev_get_egress_qos_mask()
203 		if (mp->priority == skprio) {  in vlan_dev_get_egress_qos_mask()
204 			return mp->vlan_qos; /* This should already be shifted  in vlan_dev_get_egress_qos_mask()
208 		mp = mp->next;  in vlan_dev_get_egress_qos_mask()
297  * eth_type_vlan - check for valid vlan ether type.
324  * __vlan_insert_inner_tag - inner VLAN tag inserting
326  * @vlan_proto: VLAN encapsulation protocol
333  * Does not change skb->protocol so this function can be used during receive.
342 		return -ENOMEM;  in __vlan_insert_inner_tag()
348 		memmove(skb->data, skb->data + VLAN_HLEN, mac_len - ETH_TLEN);  in __vlan_insert_inner_tag()
349 	skb->mac_header -= VLAN_HLEN;  in __vlan_insert_inner_tag()
351 	veth = (struct vlan_ethhdr *)(skb->data + mac_len - ETH_HLEN);  in __vlan_insert_inner_tag()
356 		 * skb->data has space for h_vlan_proto  in __vlan_insert_inner_tag()
358 		veth->h_vlan_proto = vlan_proto;  in __vlan_insert_inner_tag()
361 		 * skb->data has no space for h_vlan_proto  in __vlan_insert_inner_tag()
363 		veth->h_vlan_encapsulated_proto = skb->protocol;  in __vlan_insert_inner_tag()
367 	veth->h_vlan_TCI = htons(vlan_tci);  in __vlan_insert_inner_tag()
373  * __vlan_insert_tag - regular VLAN tag inserting
375  * @vlan_proto: VLAN encapsulation protocol
381  * Does not change skb->protocol so this function can be used during receive.
390  * vlan_insert_inner_tag - inner VLAN tag inserting
392  * @vlan_proto: VLAN encapsulation protocol
402  * Does not change skb->protocol so this function can be used during receive.
420  * vlan_insert_tag - regular VLAN tag inserting
422  * @vlan_proto: VLAN encapsulation protocol
431  * Does not change skb->protocol so this function can be used during receive.
440  * vlan_insert_tag_set_proto - regular VLAN tag inserting
442  * @vlan_proto: VLAN encapsulation protocol
457 		skb->protocol = vlan_proto;  in vlan_insert_tag_set_proto()
462  * __vlan_hwaccel_clear_tag - clear hardware accelerated VLAN info
469 	skb->vlan_present = 0;  in __vlan_hwaccel_clear_tag()
473  * __vlan_hwaccel_copy_tag - copy hardware accelerated VLAN info from another skb
481 	dst->vlan_present = src->vlan_present;  in __vlan_hwaccel_copy_tag()
482 	dst->vlan_proto = src->vlan_proto;  in __vlan_hwaccel_copy_tag()
483 	dst->vlan_tci = src->vlan_tci;  in __vlan_hwaccel_copy_tag()
487  * __vlan_hwaccel_push_inside - pushes vlan tag to the payload
490  * Pushes the VLAN tag from @skb->vlan_tci inside to the payload.
497 	skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,  in __vlan_hwaccel_push_inside()
505  * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
507  * @vlan_proto: VLAN encapsulation protocol
510  * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
515 	skb->vlan_proto = vlan_proto;  in __vlan_hwaccel_put_tag()
516 	skb->vlan_tci = vlan_tci;  in __vlan_hwaccel_put_tag()
517 	skb->vlan_present = 1;  in __vlan_hwaccel_put_tag()
521  * __vlan_get_tag - get the VLAN ID that is part of the payload
529 	struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data;  in __vlan_get_tag()
531 	if (!eth_type_vlan(veth->h_vlan_proto))  in __vlan_get_tag()
532 		return -EINVAL;  in __vlan_get_tag()
534 	*vlan_tci = ntohs(veth->h_vlan_TCI);  in __vlan_get_tag()
539  * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
543  * Returns error if @skb->vlan_tci is not set correctly
553 		return -EINVAL;  in __vlan_hwaccel_get_tag()
558  * vlan_get_tag - get the VLAN ID from the skb
566 	if (skb->dev->features & NETIF_F_HW_VLAN_CTAG_TX) {  in vlan_get_tag()
574  * vlan_get_protocol - get protocol EtherType.
576  * @type: first vlan protocol
585 	unsigned int vlan_depth = skb->mac_len, parse_depth = VLAN_MAX_DEPTH;  in __vlan_get_protocol()
588 	 * present at mac_len - VLAN_HLEN (if mac_len > 0), or at  in __vlan_get_protocol()
595 			vlan_depth -= VLAN_HLEN;  in __vlan_get_protocol()
603 			if (unlikely(!vh || !--parse_depth))  in __vlan_get_protocol()
606 			type = vh->h_vlan_encapsulated_proto;  in __vlan_get_protocol()
618  * vlan_get_protocol - get protocol EtherType.
626 	return __vlan_get_protocol(skb, skb->protocol, NULL);  in vlan_get_protocol()
629 /* A getter for the SKB protocol field which will handle VLAN tags consistently
636 		 * moves it to skb->vlan_proto  in skb_protocol()
638 		return skb_vlan_tag_present(skb) ? skb->vlan_proto : skb->protocol;  in skb_protocol()
650 	 * Was a VLAN packet, grab the encapsulated protocol, which the layer  in vlan_set_encap_proto()
654 	proto = vhdr->h_vlan_encapsulated_proto;  in vlan_set_encap_proto()
656 		skb->protocol = proto;  in vlan_set_encap_proto()
664 		 * breaks the protocol design and runs IPX over 802.3 without  in vlan_set_encap_proto()
669 		skb->protocol = htons(ETH_P_802_3);  in vlan_set_encap_proto()
674 		skb->protocol = htons(ETH_P_802_2);  in vlan_set_encap_proto()
678  * skb_vlan_tagged - check if skb is vlan tagged.
687 	    likely(!eth_type_vlan(skb->protocol)))  in skb_vlan_tagged()
694  * skb_vlan_tagged_multi - check if skb is vlan tagged with multiple headers.
702 	__be16 protocol = skb->protocol;  in skb_vlan_tagged_multi()  local
707 		if (likely(!eth_type_vlan(protocol)))  in skb_vlan_tagged_multi()
713 		veh = (struct vlan_ethhdr *)skb->data;  in skb_vlan_tagged_multi()
714 		protocol = veh->h_vlan_encapsulated_proto;  in skb_vlan_tagged_multi()
717 	if (!eth_type_vlan(protocol))  in skb_vlan_tagged_multi()
724  * vlan_features_check - drop unsafe features for skb with multiple tags.
734 		/* In the case of multi-tagged packets, use a direct mask  in vlan_features_check()
748  * compare_vlan_header - Compare two vlan headers
762 	return ((__force u32)h1->h_vlan_TCI ^ (__force u32)h2->h_vlan_TCI) |  in compare_vlan_header()
763 	       ((__force u32)h1->h_vlan_encapsulated_proto ^  in compare_vlan_header()
764 		(__force u32)h2->h_vlan_encapsulated_proto);  in compare_vlan_header()