[mirror_ubuntu-bionic-kernel.git] / net / 8021q / vlan_core.c

#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <linux/netpoll.h>
#include "vlan.h"

/* VLAN rx hw acceleration helper.  This acts like netif_{rx,receive_skb}(). */
int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
		      u16 vlan_tci, int polling)
{
	if (netpoll_rx(skb))
		return NET_RX_DROP;

	if (skb_bond_should_drop(skb))
		goto drop;

	__vlan_hwaccel_put_tag(skb, vlan_tci);
	skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);

	if (!skb->dev)
		goto drop;

	return (polling ? netif_receive_skb(skb) : netif_rx(skb));

drop:
	dev_kfree_skb_any(skb);
	return NET_RX_DROP;
}
EXPORT_SYMBOL(__vlan_hwaccel_rx);

int vlan_hwaccel_do_receive(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
	struct net_device_stats *stats;

	skb->dev = vlan_dev_info(dev)->real_dev;
	netif_nit_deliver(skb);

	skb->dev = dev;
	skb->priority = vlan_get_ingress_priority(dev, skb->vlan_tci);
	skb->vlan_tci = 0;

	stats = &dev->stats;
	stats->rx_packets++;
	stats->rx_bytes += skb->len;

	switch (skb->pkt_type) {
	case PACKET_BROADCAST:
		break;
	case PACKET_MULTICAST:
		stats->multicast++;
		break;
	case PACKET_OTHERHOST:
		/* Our lower layer thinks this is not local, let's make sure.
		 * This allows the VLAN to have a different MAC than the
		 * underlying device, and still route correctly. */
		if (!compare_ether_addr(eth_hdr(skb)->h_dest,
					dev->dev_addr))
			skb->pkt_type = PACKET_HOST;
		break;
	};
	return 0;
}

struct net_device *vlan_dev_real_dev(const struct net_device *dev)
{
	return vlan_dev_info(dev)->real_dev;
}
EXPORT_SYMBOL(vlan_dev_real_dev);

u16 vlan_dev_vlan_id(const struct net_device *dev)
{
	return vlan_dev_info(dev)->vlan_id;
}
EXPORT_SYMBOL(vlan_dev_vlan_id);

static gro_result_t
vlan_gro_common(struct napi_struct *napi, struct vlan_group *grp,
		unsigned int vlan_tci, struct sk_buff *skb)
{
	struct sk_buff *p;

	if (skb_bond_should_drop(skb))
		goto drop;

	__vlan_hwaccel_put_tag(skb, vlan_tci);
	skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);

	if (!skb->dev)
		goto drop;

	for (p = napi->gro_list; p; p = p->next) {
		NAPI_GRO_CB(p)->same_flow =
			p->dev == skb->dev && !compare_ether_header(
				skb_mac_header(p), skb_gro_mac_header(skb));
		NAPI_GRO_CB(p)->flush = 0;
	}

	return dev_gro_receive(napi, skb);

drop:
	return GRO_DROP;
}

gro_result_t vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
			      unsigned int vlan_tci, struct sk_buff *skb)
{
	if (netpoll_rx_on(skb))
		return vlan_hwaccel_receive_skb(skb, grp, vlan_tci)
			? GRO_DROP : GRO_NORMAL;

	skb_gro_reset_offset(skb);

	return napi_skb_finish(vlan_gro_common(napi, grp, vlan_tci, skb), skb);
}
EXPORT_SYMBOL(vlan_gro_receive);

gro_result_t vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
			    unsigned int vlan_tci)
{
	struct sk_buff *skb = napi_frags_skb(napi);

	if (!skb)
		return GRO_DROP;

	if (netpoll_rx_on(skb)) {
		skb->protocol = eth_type_trans(skb, skb->dev);
		return vlan_hwaccel_receive_skb(skb, grp, vlan_tci)
			? GRO_DROP : GRO_NORMAL;
	}

	return napi_frags_finish(napi, skb,
				 vlan_gro_common(napi, grp, vlan_tci, skb));
}
EXPORT_SYMBOL(vlan_gro_frags);
Commit	Line	Data
7750f403 PM	1	#include <linux/skbuff.h>
	2	#include <linux/netdevice.h>
	3	#include <linux/if_vlan.h>
4ead4431	4	#include <linux/netpoll.h>
7750f403 PM	5	#include "vlan.h"
	6
	7	/* VLAN rx hw acceleration helper. This acts like netif_{rx,receive_skb}(). */
	8	int __vlan_hwaccel_rx(struct sk_buff skb, struct vlan_group grp,
9bb8582e	9	u16 vlan_tci, int polling)
7750f403	10	{
4ead4431 HX	11	if (netpoll_rx(skb))
	12	return NET_RX_DROP;
	13
e1c096e2 HX	14	if (skb_bond_should_drop(skb))
e1c096e2 HX	15	goto drop;
7750f403	16
b93ab837	17	__vlan_hwaccel_put_tag(skb, vlan_tci);
e1c096e2 HX	18	skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
	19
	20	if (!skb->dev)
	21	goto drop;
9b22ea56 PM	22
9b22ea56 PM	23	return (polling ? netif_receive_skb(skb) : netif_rx(skb));
e1c096e2 HX	24
	25	drop:
	26	dev_kfree_skb_any(skb);
	27	return NET_RX_DROP;
9b22ea56 PM	28	}
	29	EXPORT_SYMBOL(__vlan_hwaccel_rx);
	30
	31	int vlan_hwaccel_do_receive(struct sk_buff *skb)
	32	{
e1c096e2	33	struct net_device *dev = skb->dev;
9b22ea56 PM	34	struct net_device_stats *stats;
9b22ea56 PM	35
e1c096e2	36	skb->dev = vlan_dev_info(dev)->real_dev;
bc1d0411 PM	37	netif_nit_deliver(skb);
bc1d0411 PM	38
9b22ea56 PM	39	skb->dev = dev;
9b22ea56 PM	40	skb->priority = vlan_get_ingress_priority(dev, skb->vlan_tci);
bc1d0411	41	skb->vlan_tci = 0;
7750f403	42
9b22ea56	43	stats = &dev->stats;
7750f403 PM	44	stats->rx_packets++;
	45	stats->rx_bytes += skb->len;
	46
7750f403 PM	47	switch (skb->pkt_type) {
	48	case PACKET_BROADCAST:
	49	break;
	50	case PACKET_MULTICAST:
	51	stats->multicast++;
	52	break;
	53	case PACKET_OTHERHOST:
	54	/* Our lower layer thinks this is not local, let's make sure.
	55	* This allows the VLAN to have a different MAC than the
	56	* underlying device, and still route correctly. */
	57	if (!compare_ether_addr(eth_hdr(skb)->h_dest,
9b22ea56	58	dev->dev_addr))
7750f403 PM	59	skb->pkt_type = PACKET_HOST;
	60	break;
	61	};
9b22ea56	62	return 0;
7750f403	63	}
22d1ba74 PM	64
	65	struct net_device vlan_dev_real_dev(const struct net_device dev)
	66	{
	67	return vlan_dev_info(dev)->real_dev;
	68	}
116cb428	69	EXPORT_SYMBOL(vlan_dev_real_dev);
22d1ba74 PM	70
	71	u16 vlan_dev_vlan_id(const struct net_device *dev)
	72	{
	73	return vlan_dev_info(dev)->vlan_id;
	74	}
116cb428	75	EXPORT_SYMBOL(vlan_dev_vlan_id);
e1c096e2	76
5b252f0c BH	77	static gro_result_t
	78	vlan_gro_common(struct napi_struct napi, struct vlan_group grp,
	79	unsigned int vlan_tci, struct sk_buff *skb)
e1c096e2 HX	80	{
	81	struct sk_buff *p;
	82
	83	if (skb_bond_should_drop(skb))
	84	goto drop;
	85
b93ab837	86	__vlan_hwaccel_put_tag(skb, vlan_tci);
e1c096e2 HX	87	skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
	88
	89	if (!skb->dev)
	90	goto drop;
	91
	92	for (p = napi->gro_list; p; p = p->next) {
aa4b9f53 HX	93	NAPI_GRO_CB(p)->same_flow =
	94	p->dev == skb->dev && !compare_ether_header(
	95	skb_mac_header(p), skb_gro_mac_header(skb));
e1c096e2 HX	96	NAPI_GRO_CB(p)->flush = 0;
	97	}
	98
	99	return dev_gro_receive(napi, skb);
	100
	101	drop:
d1c76af9	102	return GRO_DROP;
e1c096e2 HX	103	}
e1c096e2 HX	104
c7c4b3b6 BH	105	gro_result_t vlan_gro_receive(struct napi_struct napi, struct vlan_group grp,
c7c4b3b6 BH	106	unsigned int vlan_tci, struct sk_buff *skb)
e1c096e2	107	{
2ffb4558	108	if (netpoll_rx_on(skb))
c7c4b3b6 BH	109	return vlan_hwaccel_receive_skb(skb, grp, vlan_tci)
c7c4b3b6 BH	110	? GRO_DROP : GRO_NORMAL;
2ffb4558	111
86911732 HX	112	skb_gro_reset_offset(skb);
86911732 HX	113
5d0d9be8	114	return napi_skb_finish(vlan_gro_common(napi, grp, vlan_tci, skb), skb);
e1c096e2 HX	115	}
	116	EXPORT_SYMBOL(vlan_gro_receive);
	117
c7c4b3b6 BH	118	gro_result_t vlan_gro_frags(struct napi_struct napi, struct vlan_group grp,
c7c4b3b6 BH	119	unsigned int vlan_tci)
e1c096e2	120	{
76620aaf	121	struct sk_buff *skb = napi_frags_skb(napi);
e1c096e2 HX	122
e1c096e2 HX	123	if (!skb)
c7c4b3b6	124	return GRO_DROP;
e1c096e2	125
1db9e29b HX	126	if (netpoll_rx_on(skb)) {
1db9e29b HX	127	skb->protocol = eth_type_trans(skb, skb->dev);
c7c4b3b6 BH	128	return vlan_hwaccel_receive_skb(skb, grp, vlan_tci)
c7c4b3b6 BH	129	? GRO_DROP : GRO_NORMAL;
1db9e29b	130	}
2ffb4558	131
5d0d9be8 HX	132	return napi_frags_finish(napi, skb,
5d0d9be8 HX	133	vlan_gro_common(napi, grp, vlan_tci, skb));
e1c096e2 HX	134	}
e1c096e2 HX	135	EXPORT_SYMBOL(vlan_gro_frags);