ad1afb0039
- Without the 8021q module loaded in the kernel, all 802.1p packets (VLAN 0 but QoS tagging) are silently discarded (as expected, as the protocol is not loaded). - Without this patch in 8021q module, these packets are forwarded to the module, but they are discarded also if VLAN 0 is not configured, which should not be the default behaviour, as VLAN 0 is not really a VLANed packet but a 802.1p packet. Defining VLAN 0 makes it almost impossible to communicate with mixed 802.1p and non 802.1p devices on the same network due to arp table issues. - Changed logic to skip vlan specific code in vlan_skb_recv if VLAN is 0 and we have not defined a VLAN with ID 0, but we accept the packet with the encapsulated proto and pass it later to netif_rx. - In the vlan device event handler, added some logic to add VLAN 0 to HW filter in devices that support it (this prevented any traffic in VLAN 0 to reach the stack in e1000e with HW filter under 2.6.35, and probably also with other HW filtered cards, so we fix it here). - In the vlan unregister logic, prevent the elimination of VLAN 0 in devices with HW filter. - The default behaviour is to ignore the VLAN 0 tagging and accept the packet as if it was not tagged, but we can still define a VLAN 0 if desired (so it is backwards compatible). Signed-off-by: Pedro Garcia <pedro.netdev@dondevamos.com> Signed-off-by: David S. Miller <davem@davemloft.net>
151 lines
3.7 KiB
C
151 lines
3.7 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 <linux/netpoll.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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struct net_device *vlan_dev;
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u16 vlan_id;
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if (netpoll_rx(skb))
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return NET_RX_DROP;
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if (skb_bond_should_drop(skb, ACCESS_ONCE(skb->dev->master)))
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skb->deliver_no_wcard = 1;
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skb->skb_iif = skb->dev->ifindex;
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__vlan_hwaccel_put_tag(skb, vlan_tci);
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vlan_id = vlan_tci & VLAN_VID_MASK;
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vlan_dev = vlan_group_get_device(grp, vlan_id);
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if (vlan_dev)
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skb->dev = vlan_dev;
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else if (vlan_id)
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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 vlan_rx_stats *rx_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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rx_stats = this_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats);
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u64_stats_update_begin(&rx_stats->syncp);
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rx_stats->rx_packets++;
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rx_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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rx_stats->rx_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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u64_stats_update_end(&rx_stats->syncp);
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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 gro_result_t
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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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struct net_device *vlan_dev;
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u16 vlan_id;
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if (skb_bond_should_drop(skb, ACCESS_ONCE(skb->dev->master)))
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skb->deliver_no_wcard = 1;
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skb->skb_iif = skb->dev->ifindex;
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__vlan_hwaccel_put_tag(skb, vlan_tci);
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vlan_id = vlan_tci & VLAN_VID_MASK;
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vlan_dev = vlan_group_get_device(grp, vlan_id);
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if (vlan_dev)
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skb->dev = vlan_dev;
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else if (vlan_id)
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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 =
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p->dev == skb->dev && !compare_ether_header(
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skb_mac_header(p), skb_gro_mac_header(skb));
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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 GRO_DROP;
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}
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gro_result_t 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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if (netpoll_rx_on(skb))
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return vlan_hwaccel_receive_skb(skb, grp, vlan_tci)
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? GRO_DROP : GRO_NORMAL;
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skb_gro_reset_offset(skb);
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return napi_skb_finish(vlan_gro_common(napi, grp, vlan_tci, skb), skb);
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}
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EXPORT_SYMBOL(vlan_gro_receive);
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gro_result_t vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
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unsigned int vlan_tci)
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{
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struct sk_buff *skb = napi_frags_skb(napi);
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if (!skb)
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return GRO_DROP;
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if (netpoll_rx_on(skb)) {
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skb->protocol = eth_type_trans(skb, skb->dev);
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return vlan_hwaccel_receive_skb(skb, grp, vlan_tci)
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? GRO_DROP : GRO_NORMAL;
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}
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return napi_frags_finish(napi, skb,
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vlan_gro_common(napi, grp, vlan_tci, skb));
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}
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EXPORT_SYMBOL(vlan_gro_frags);
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