| 1 | /* |
| 2 | * net/dsa/tag_qinq.c - QinQ tag format handling |
| 3 | * Copyright (c) 2010 Gabor Juhos <juhosg@openwrt.org> |
| 4 | * |
| 5 | * This file was based on: |
| 6 | * net/dsa/tag_edsa.c - Ethertype DSA tagging |
| 7 | * Copyright (c) 2008-2009 Marvell Semiconductor |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/etherdevice.h> |
| 16 | #include <linux/list.h> |
| 17 | #include <linux/netdevice.h> |
| 18 | #include <linux/if_vlan.h> |
| 19 | |
| 20 | #include "dsa_priv.h" |
| 21 | |
| 22 | netdev_tx_t qinq_xmit(struct sk_buff *skb, struct net_device *dev) |
| 23 | { |
| 24 | struct dsa_slave_priv *p = netdev_priv(dev); |
| 25 | struct vlan_ethhdr *veth; |
| 26 | unsigned int len; |
| 27 | int ret; |
| 28 | |
| 29 | if (skb_cow_head(skb, VLAN_HLEN) < 0) |
| 30 | goto out_free_skb; |
| 31 | |
| 32 | veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN); |
| 33 | |
| 34 | /* Move the mac addresses to the beginning of the new header. */ |
| 35 | memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN); |
| 36 | skb->mac_header -= VLAN_HLEN; |
| 37 | |
| 38 | /* setup VLAN header fields */ |
| 39 | veth->h_vlan_proto = htons(ETH_P_QINQ); |
| 40 | veth->h_vlan_TCI = htons(p->port); |
| 41 | |
| 42 | len = skb->len; |
| 43 | skb->protocol = htons(ETH_P_QINQ); |
| 44 | skb->dev = p->parent->dst->master_netdev; |
| 45 | |
| 46 | ret = dev_queue_xmit(skb); |
| 47 | if (unlikely(ret != NET_XMIT_SUCCESS)) |
| 48 | goto out_dropped; |
| 49 | |
| 50 | dev->stats.tx_packets++; |
| 51 | dev->stats.tx_bytes += len; |
| 52 | |
| 53 | return NETDEV_TX_OK; |
| 54 | |
| 55 | out_free_skb: |
| 56 | kfree_skb(skb); |
| 57 | out_dropped: |
| 58 | dev->stats.tx_dropped++; |
| 59 | return NETDEV_TX_OK; |
| 60 | } |
| 61 | |
| 62 | static int qinq_rcv(struct sk_buff *skb, struct net_device *dev, |
| 63 | struct packet_type *pt, struct net_device *orig_dev) |
| 64 | { |
| 65 | struct dsa_switch_tree *dst; |
| 66 | struct dsa_switch *ds; |
| 67 | struct vlan_hdr *vhdr; |
| 68 | int source_port; |
| 69 | |
| 70 | dst = dev->dsa_ptr; |
| 71 | if (unlikely(dst == NULL)) |
| 72 | goto out_drop; |
| 73 | ds = dst->ds[0]; |
| 74 | |
| 75 | skb = skb_unshare(skb, GFP_ATOMIC); |
| 76 | if (skb == NULL) |
| 77 | goto out; |
| 78 | |
| 79 | if (unlikely(!pskb_may_pull(skb, VLAN_HLEN))) |
| 80 | goto out_drop; |
| 81 | |
| 82 | vhdr = (struct vlan_hdr *)skb->data; |
| 83 | source_port = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; |
| 84 | if (source_port >= DSA_MAX_PORTS || ds->ports[source_port] == NULL) |
| 85 | goto out_drop; |
| 86 | |
| 87 | /* Remove the outermost VLAN tag and update checksum. */ |
| 88 | skb_pull_rcsum(skb, VLAN_HLEN); |
| 89 | memmove(skb->data - ETH_HLEN, |
| 90 | skb->data - ETH_HLEN - VLAN_HLEN, |
| 91 | 2 * ETH_ALEN); |
| 92 | |
| 93 | skb->dev = ds->ports[source_port]; |
| 94 | skb_push(skb, ETH_HLEN); |
| 95 | skb->pkt_type = PACKET_HOST; |
| 96 | skb->protocol = eth_type_trans(skb, skb->dev); |
| 97 | |
| 98 | skb->dev->stats.rx_packets++; |
| 99 | skb->dev->stats.rx_bytes += skb->len; |
| 100 | |
| 101 | netif_receive_skb(skb); |
| 102 | |
| 103 | return 0; |
| 104 | |
| 105 | out_drop: |
| 106 | kfree_skb(skb); |
| 107 | out: |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | static struct packet_type qinq_packet_type __read_mostly = { |
| 112 | .type = cpu_to_be16(ETH_P_QINQ), |
| 113 | .func = qinq_rcv, |
| 114 | }; |
| 115 | |
| 116 | static int __init qinq_init_module(void) |
| 117 | { |
| 118 | dev_add_pack(&qinq_packet_type); |
| 119 | return 0; |
| 120 | } |
| 121 | module_init(qinq_init_module); |
| 122 | |
| 123 | static void __exit qinq_cleanup_module(void) |
| 124 | { |
| 125 | dev_remove_pack(&qinq_packet_type); |
| 126 | } |
| 127 | module_exit(qinq_cleanup_module); |
| 128 | |
