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
41  *	struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr)
70 	return (struct vlan_ethhdr *)skb->data;  in skb_vlan_eth_hdr()
84         return dev->priv_flags & IFF_802_1Q_VLAN;  in is_vlan_dev()
87 #define skb_vlan_tag_present(__skb)	(!!(__skb)->vlan_all)
88 #define skb_vlan_tag_get(__skb)		((__skb)->vlan_tci)
89 #define skb_vlan_tag_get_id(__skb)	((__skb)->vlan_tci & VLAN_VID_MASK)
90 #define skb_vlan_tag_get_cfi(__skb)	(!!((__skb)->vlan_tci & VLAN_CFI_MASK))
91 #define skb_vlan_tag_get_prio(__skb)	(((__skb)->vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT)
118  *	struct vlan_pcpu_stats - VLAN percpu rx/tx stats
151  *	struct vlan_priority_tci_mapping - vlan egress priority mappings
153  *	@vlan_qos: vlan priority: (skb->priority << 13) & 0xE000
166  *	struct vlan_dev_priv - VLAN private device data
215 	mp = vlan_dev_priv(dev)->egress_priority_map[(skprio & 0xF)];  in vlan_dev_get_egress_qos_mask()
217 		if (mp->priority == skprio) {  in vlan_dev_get_egress_qos_mask()
218 			return mp->vlan_qos; /* This should already be shifted  in vlan_dev_get_egress_qos_mask()
222 		mp = mp->next;  in vlan_dev_get_egress_qos_mask()
311  * eth_type_vlan - check for valid vlan ether type.
338  * __vlan_insert_inner_tag - inner VLAN tag inserting
345  * Does not change skb->protocol so this function can be used during receive.
356 		return -ENOMEM;  in __vlan_insert_inner_tag()
362 		memmove(skb->data, skb->data + VLAN_HLEN, mac_len - ETH_TLEN);  in __vlan_insert_inner_tag()
364 		skb->mac_header -= VLAN_HLEN;  in __vlan_insert_inner_tag()
366 	veth = (struct vlan_ethhdr *)(skb->data + mac_len - ETH_HLEN);  in __vlan_insert_inner_tag()
371 		 * skb->data has space for h_vlan_proto  in __vlan_insert_inner_tag()
373 		veth->h_vlan_proto = vlan_proto;  in __vlan_insert_inner_tag()
376 		 * skb->data has no space for h_vlan_proto  in __vlan_insert_inner_tag()
378 		veth->h_vlan_encapsulated_proto = skb->protocol;  in __vlan_insert_inner_tag()
382 	veth->h_vlan_TCI = htons(vlan_tci);  in __vlan_insert_inner_tag()
388  * __vlan_insert_tag - regular VLAN tag inserting
394  * Does not change skb->protocol so this function can be used during receive.
405  * vlan_insert_inner_tag - inner VLAN tag inserting
412  * Returns a VLAN tagged skb. This might change skb->head.
417  * Does not change skb->protocol so this function can be used during receive.
437  * vlan_insert_tag - regular VLAN tag inserting
443  * Returns a VLAN tagged skb. This might change skb->head.
448  * Does not change skb->protocol so this function can be used during receive.
459  * vlan_insert_tag_set_proto - regular VLAN tag inserting
465  * Returns a VLAN tagged skb. This might change skb->head.
478 		skb->protocol = vlan_proto;  in vlan_insert_tag_set_proto()
483  * __vlan_hwaccel_clear_tag - clear hardware accelerated VLAN info
490 	skb->vlan_all = 0;  in __vlan_hwaccel_clear_tag()
494  * __vlan_hwaccel_copy_tag - copy hardware accelerated VLAN info from another skb
502 	dst->vlan_all = src->vlan_all;  in __vlan_hwaccel_copy_tag()
506  * __vlan_hwaccel_push_inside - pushes vlan tag to the payload
509  * Pushes the VLAN tag from @skb->vlan_tci inside to the payload.
516 	skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,  in __vlan_hwaccel_push_inside()
524  * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
529  * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
534 	skb->vlan_proto = vlan_proto;  in __vlan_hwaccel_put_tag()
535 	skb->vlan_tci = vlan_tci;  in __vlan_hwaccel_put_tag()
539  * __vlan_get_tag - get the VLAN ID that is part of the payload
549 	if (!eth_type_vlan(veth->h_vlan_proto))  in __vlan_get_tag()
550 		return -ENODATA;  in __vlan_get_tag()
552 	*vlan_tci = ntohs(veth->h_vlan_TCI);  in __vlan_get_tag()
557  * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
561  * Returns: error if @skb->vlan_tci is not set correctly
571 		return -ENODATA;  in __vlan_hwaccel_get_tag()
576  * vlan_get_tag - get the VLAN ID from the skb
584 	if (skb->dev->features & NETIF_F_HW_VLAN_CTAG_TX) {  in vlan_get_tag()
592  * __vlan_get_protocol_offset() - get protocol EtherType.
596  * @depth: buffer to store length of eth and vlan tags in bytes
604 						int *depth)  in __vlan_get_protocol_offset()  argument
606 	unsigned int vlan_depth = skb->mac_len, parse_depth = VLAN_MAX_DEPTH;  in __vlan_get_protocol_offset()
609 	 * present at mac_len - VLAN_HLEN (if mac_len > 0), or at  in __vlan_get_protocol_offset()
616 			vlan_depth -= VLAN_HLEN;  in __vlan_get_protocol_offset()
625 			if (unlikely(!vh || !--parse_depth))  in __vlan_get_protocol_offset()
628 			type = vh->h_vlan_encapsulated_proto;  in __vlan_get_protocol_offset()
633 	if (depth)  in __vlan_get_protocol_offset()
634 		*depth = vlan_depth;  in __vlan_get_protocol_offset()
640 					 int *depth)  in __vlan_get_protocol()  argument
642 	return __vlan_get_protocol_offset(skb, type, 0, depth);  in __vlan_get_protocol()
646  * vlan_get_protocol - get protocol EtherType.
654 	return __vlan_get_protocol(skb, skb->protocol, NULL);  in vlan_get_protocol()
657 /* This version of __vlan_get_protocol() also pulls mac header in skb->head */
659 						 __be16 type, int *depth)  in vlan_get_protocol_and_depth()  argument
668 		else if (depth)  in vlan_get_protocol_and_depth()
669 			*depth = maclen;  in vlan_get_protocol_and_depth()
681 		 * moves it to skb->vlan_proto  in skb_protocol()
683 		return skb_vlan_tag_present(skb) ? skb->vlan_proto : skb->protocol;  in skb_protocol()
695 	 * Was a VLAN packet, grab the encapsulated protocol, which the layer  in vlan_set_encap_proto()
699 	proto = vhdr->h_vlan_encapsulated_proto;  in vlan_set_encap_proto()
701 		skb->protocol = proto;  in vlan_set_encap_proto()
710 		 * an 802.2 LLC layer. We look for FFFF which isn't a used  in vlan_set_encap_proto()
714 		skb->protocol = htons(ETH_P_802_3);  in vlan_set_encap_proto()
719 		skb->protocol = htons(ETH_P_802_2);  in vlan_set_encap_proto()
723  * vlan_remove_tag - remove outer VLAN tag from payload
727  * Expects the skb to contain a VLAN tag in the payload, and to have skb->data
730  * Returns: a new pointer to skb->data, or NULL on failure to pull.
734 	struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data + ETH_HLEN);  in vlan_remove_tag()
736 	*vlan_tci = ntohs(vhdr->h_vlan_TCI);  in vlan_remove_tag()
738 	memmove(skb->data + VLAN_HLEN, skb->data, 2 * ETH_ALEN);  in vlan_remove_tag()
744  * skb_vlan_tagged - check if skb is vlan tagged.
753 	    likely(!eth_type_vlan(skb->protocol)))  in skb_vlan_tagged()
760  * skb_vlan_tagged_multi - check if skb is vlan tagged with multiple headers.
768 	__be16 protocol = skb->protocol;  in skb_vlan_tagged_multi()
780 		protocol = veh->h_vlan_encapsulated_proto;  in skb_vlan_tagged_multi()
790  * vlan_features_check - drop unsafe features for skb with multiple tags.
800 		/* In the case of multi-tagged packets, use a direct mask  in vlan_features_check()
814  * compare_vlan_header - Compare two vlan headers
822  * Return: 0 if equal, arbitrary non-zero value if not equal.
830 	return ((__force u32)h1->h_vlan_TCI ^ (__force u32)h2->h_vlan_TCI) |  in compare_vlan_header()
831 	       ((__force u32)h1->h_vlan_encapsulated_proto ^  in compare_vlan_header()
832 		(__force u32)h2->h_vlan_encapsulated_proto);  in compare_vlan_header()