forked from luck/tmp_suning_uos_patched
116cb42855
In previous kernels, any kernel module could get access to the 'real-device' and the VLAN-ID for a particular VLAN. In more recent kernels, the code was restructured such that this is hard to do without accessing private .h files for any module that cannot use GPL-only symbols. Attached is a patch to once again allow non-GPL modules the ability to access the real-device and VLAN id for VLANs. Signed-off-by: Ben Greear <greearb@candelatech.com> Acked-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
148 lines
3.0 KiB
C
148 lines
3.0 KiB
C
#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/if_vlan.h>
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#include "vlan.h"
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/* VLAN rx hw acceleration helper. This acts like netif_{rx,receive_skb}(). */
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int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
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u16 vlan_tci, int polling)
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{
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if (skb_bond_should_drop(skb))
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goto drop;
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skb->vlan_tci = vlan_tci;
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skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
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if (!skb->dev)
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goto drop;
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return (polling ? netif_receive_skb(skb) : netif_rx(skb));
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drop:
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dev_kfree_skb_any(skb);
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return NET_RX_DROP;
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}
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EXPORT_SYMBOL(__vlan_hwaccel_rx);
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int vlan_hwaccel_do_receive(struct sk_buff *skb)
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{
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struct net_device *dev = skb->dev;
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struct net_device_stats *stats;
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skb->dev = vlan_dev_info(dev)->real_dev;
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netif_nit_deliver(skb);
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skb->dev = dev;
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skb->priority = vlan_get_ingress_priority(dev, skb->vlan_tci);
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skb->vlan_tci = 0;
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stats = &dev->stats;
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stats->rx_packets++;
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stats->rx_bytes += skb->len;
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switch (skb->pkt_type) {
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case PACKET_BROADCAST:
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break;
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case PACKET_MULTICAST:
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stats->multicast++;
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break;
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case PACKET_OTHERHOST:
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/* Our lower layer thinks this is not local, let's make sure.
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* This allows the VLAN to have a different MAC than the
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* underlying device, and still route correctly. */
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if (!compare_ether_addr(eth_hdr(skb)->h_dest,
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dev->dev_addr))
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skb->pkt_type = PACKET_HOST;
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break;
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};
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return 0;
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}
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struct net_device *vlan_dev_real_dev(const struct net_device *dev)
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{
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return vlan_dev_info(dev)->real_dev;
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}
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EXPORT_SYMBOL(vlan_dev_real_dev);
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u16 vlan_dev_vlan_id(const struct net_device *dev)
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{
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return vlan_dev_info(dev)->vlan_id;
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}
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EXPORT_SYMBOL(vlan_dev_vlan_id);
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static int vlan_gro_common(struct napi_struct *napi, struct vlan_group *grp,
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unsigned int vlan_tci, struct sk_buff *skb)
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{
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struct sk_buff *p;
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if (skb_bond_should_drop(skb))
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goto drop;
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skb->vlan_tci = vlan_tci;
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skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
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if (!skb->dev)
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goto drop;
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for (p = napi->gro_list; p; p = p->next) {
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NAPI_GRO_CB(p)->same_flow = p->dev == skb->dev;
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NAPI_GRO_CB(p)->flush = 0;
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}
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return dev_gro_receive(napi, skb);
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drop:
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return 2;
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}
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int vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
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unsigned int vlan_tci, struct sk_buff *skb)
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{
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int err = NET_RX_SUCCESS;
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switch (vlan_gro_common(napi, grp, vlan_tci, skb)) {
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case -1:
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return netif_receive_skb(skb);
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case 2:
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err = NET_RX_DROP;
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/* fall through */
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case 1:
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kfree_skb(skb);
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break;
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}
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return err;
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}
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EXPORT_SYMBOL(vlan_gro_receive);
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int vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
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unsigned int vlan_tci, struct napi_gro_fraginfo *info)
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{
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struct sk_buff *skb = napi_fraginfo_skb(napi, info);
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int err = NET_RX_DROP;
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if (!skb)
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goto out;
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err = NET_RX_SUCCESS;
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switch (vlan_gro_common(napi, grp, vlan_tci, skb)) {
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case -1:
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return netif_receive_skb(skb);
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case 2:
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err = NET_RX_DROP;
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/* fall through */
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case 1:
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napi_reuse_skb(napi, skb);
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break;
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}
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out:
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return err;
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}
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EXPORT_SYMBOL(vlan_gro_frags);
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