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128 lines
2.9 KiB
C
128 lines
2.9 KiB
C
/*
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* net/dsa/tag_qinq.c - QinQ tag format handling
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* Copyright (c) 2010 Gabor Juhos <juhosg@openwrt.org>
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*
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* This file was based on:
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* net/dsa/tag_edsa.c - Ethertype DSA tagging
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* Copyright (c) 2008-2009 Marvell Semiconductor
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/etherdevice.h>
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#include <linux/list.h>
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#include <linux/netdevice.h>
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#include <linux/if_vlan.h>
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#include "dsa_priv.h"
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netdev_tx_t qinq_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct dsa_slave_priv *p = netdev_priv(dev);
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struct vlan_ethhdr *veth;
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unsigned int len;
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int ret;
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if (skb_cow_head(skb, VLAN_HLEN) < 0)
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goto out_free_skb;
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veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
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/* Move the mac addresses to the beginning of the new header. */
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memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN);
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skb->mac_header -= VLAN_HLEN;
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/* setup VLAN header fields */
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veth->h_vlan_proto = htons(ETH_P_QINQ);
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veth->h_vlan_TCI = htons(p->port);
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len = skb->len;
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skb->protocol = htons(ETH_P_QINQ);
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skb->dev = p->parent->dst->master_netdev;
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ret = dev_queue_xmit(skb);
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if (unlikely(ret != NET_XMIT_SUCCESS))
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goto out_dropped;
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += len;
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return NETDEV_TX_OK;
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out_free_skb:
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kfree_skb(skb);
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out_dropped:
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dev->stats.tx_dropped++;
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return NETDEV_TX_OK;
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}
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static int qinq_rcv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt, struct net_device *orig_dev)
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{
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struct dsa_switch_tree *dst;
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struct dsa_switch *ds;
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struct vlan_hdr *vhdr;
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int source_port;
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dst = dev->dsa_ptr;
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if (unlikely(dst == NULL))
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goto out_drop;
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ds = dst->ds[0];
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skb = skb_unshare(skb, GFP_ATOMIC);
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if (skb == NULL)
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goto out;
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if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
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goto out_drop;
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vhdr = (struct vlan_hdr *)skb->data;
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source_port = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
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if (source_port >= DSA_MAX_PORTS || ds->ports[source_port] == NULL)
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goto out_drop;
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/* Remove the outermost VLAN tag and update checksum. */
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skb_pull_rcsum(skb, VLAN_HLEN);
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memmove(skb->data - ETH_HLEN,
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skb->data - ETH_HLEN - VLAN_HLEN,
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2 * ETH_ALEN);
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skb->dev = ds->ports[source_port];
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skb_push(skb, ETH_HLEN);
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skb->pkt_type = PACKET_HOST;
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skb->protocol = eth_type_trans(skb, skb->dev);
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skb->dev->stats.rx_packets++;
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skb->dev->stats.rx_bytes += skb->len;
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netif_receive_skb(skb);
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return 0;
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out_drop:
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kfree_skb(skb);
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out:
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return 0;
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}
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static struct packet_type qinq_packet_type __read_mostly = {
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.type = cpu_to_be16(ETH_P_QINQ),
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.func = qinq_rcv,
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};
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static int __init qinq_init_module(void)
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{
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dev_add_pack(&qinq_packet_type);
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return 0;
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}
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module_init(qinq_init_module);
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static void __exit qinq_cleanup_module(void)
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{
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dev_remove_pack(&qinq_packet_type);
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}
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module_exit(qinq_cleanup_module);
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