![John Fastabend](/assets/img/avatar_default.png)
Toggling the vlan tx|rx hw offloads needs to set the hard_header_len as well otherwise we end up using LL_RESERVED_SPACE incorrectly. This results in pskb_expand_head() being used unnecessarily. Signed-off-by: John Fastabend <john.r.fastabend@intel.com> Acked-by: Jesse Gross <jesse@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
730 lines
17 KiB
C
730 lines
17 KiB
C
/*
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* INET 802.1Q VLAN
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* Ethernet-type device handling.
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*
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* Authors: Ben Greear <greearb@candelatech.com>
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* Please send support related email to: netdev@vger.kernel.org
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* VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
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*
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* Fixes:
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* Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
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* Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
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* Correct all the locking - David S. Miller <davem@redhat.com>;
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* Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/capability.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/rculist.h>
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#include <net/p8022.h>
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#include <net/arp.h>
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#include <linux/rtnetlink.h>
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#include <linux/notifier.h>
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#include <net/rtnetlink.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include <asm/uaccess.h>
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#include <linux/if_vlan.h>
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#include "vlan.h"
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#include "vlanproc.h"
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#define DRV_VERSION "1.8"
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/* Global VLAN variables */
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int vlan_net_id __read_mostly;
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const char vlan_fullname[] = "802.1Q VLAN Support";
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const char vlan_version[] = DRV_VERSION;
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static const char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
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static const char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
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static struct packet_type vlan_packet_type __read_mostly = {
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.type = cpu_to_be16(ETH_P_8021Q),
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.func = vlan_skb_recv, /* VLAN receive method */
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};
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/* End of global variables definitions. */
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static void vlan_group_free(struct vlan_group *grp)
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{
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int i;
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for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
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kfree(grp->vlan_devices_arrays[i]);
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kfree(grp);
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}
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static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
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{
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struct vlan_group *grp;
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grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
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if (!grp)
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return NULL;
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grp->real_dev = real_dev;
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return grp;
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}
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static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
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{
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struct net_device **array;
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unsigned int size;
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ASSERT_RTNL();
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array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
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if (array != NULL)
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return 0;
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size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
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array = kzalloc(size, GFP_KERNEL);
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if (array == NULL)
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return -ENOBUFS;
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vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
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return 0;
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}
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static void vlan_rcu_free(struct rcu_head *rcu)
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{
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vlan_group_free(container_of(rcu, struct vlan_group, rcu));
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}
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void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
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{
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struct vlan_dev_info *vlan = vlan_dev_info(dev);
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struct net_device *real_dev = vlan->real_dev;
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const struct net_device_ops *ops = real_dev->netdev_ops;
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struct vlan_group *grp;
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u16 vlan_id = vlan->vlan_id;
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ASSERT_RTNL();
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grp = rtnl_dereference(real_dev->vlgrp);
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BUG_ON(!grp);
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/* Take it out of our own structures, but be sure to interlock with
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* HW accelerating devices or SW vlan input packet processing if
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* VLAN is not 0 (leave it there for 802.1p).
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*/
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if (vlan_id && (real_dev->features & NETIF_F_HW_VLAN_FILTER))
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ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);
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grp->nr_vlans--;
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vlan_group_set_device(grp, vlan_id, NULL);
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if (!grp->killall)
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synchronize_net();
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unregister_netdevice_queue(dev, head);
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/* If the group is now empty, kill off the group. */
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if (grp->nr_vlans == 0) {
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vlan_gvrp_uninit_applicant(real_dev);
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rcu_assign_pointer(real_dev->vlgrp, NULL);
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if (ops->ndo_vlan_rx_register)
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ops->ndo_vlan_rx_register(real_dev, NULL);
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/* Free the group, after all cpu's are done. */
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call_rcu(&grp->rcu, vlan_rcu_free);
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}
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/* Get rid of the vlan's reference to real_dev */
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dev_put(real_dev);
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}
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int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
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{
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const char *name = real_dev->name;
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const struct net_device_ops *ops = real_dev->netdev_ops;
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if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
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pr_info("8021q: VLANs not supported on %s\n", name);
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return -EOPNOTSUPP;
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}
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if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
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(!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
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pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
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return -EOPNOTSUPP;
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}
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if (vlan_find_dev(real_dev, vlan_id) != NULL)
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return -EEXIST;
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return 0;
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}
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int register_vlan_dev(struct net_device *dev)
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{
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struct vlan_dev_info *vlan = vlan_dev_info(dev);
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struct net_device *real_dev = vlan->real_dev;
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const struct net_device_ops *ops = real_dev->netdev_ops;
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u16 vlan_id = vlan->vlan_id;
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struct vlan_group *grp, *ngrp = NULL;
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int err;
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grp = rtnl_dereference(real_dev->vlgrp);
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if (!grp) {
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ngrp = grp = vlan_group_alloc(real_dev);
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if (!grp)
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return -ENOBUFS;
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err = vlan_gvrp_init_applicant(real_dev);
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if (err < 0)
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goto out_free_group;
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}
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err = vlan_group_prealloc_vid(grp, vlan_id);
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if (err < 0)
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goto out_uninit_applicant;
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err = register_netdevice(dev);
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if (err < 0)
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goto out_uninit_applicant;
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/* Account for reference in struct vlan_dev_info */
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dev_hold(real_dev);
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netif_stacked_transfer_operstate(real_dev, dev);
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linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
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/* So, got the sucker initialized, now lets place
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* it into our local structure.
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*/
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vlan_group_set_device(grp, vlan_id, dev);
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grp->nr_vlans++;
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if (ngrp) {
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if (ops->ndo_vlan_rx_register)
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ops->ndo_vlan_rx_register(real_dev, ngrp);
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rcu_assign_pointer(real_dev->vlgrp, ngrp);
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}
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if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
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ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
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return 0;
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out_uninit_applicant:
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if (ngrp)
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vlan_gvrp_uninit_applicant(real_dev);
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out_free_group:
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if (ngrp) {
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/* Free the group, after all cpu's are done. */
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call_rcu(&ngrp->rcu, vlan_rcu_free);
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}
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return err;
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}
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/* Attach a VLAN device to a mac address (ie Ethernet Card).
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* Returns 0 if the device was created or a negative error code otherwise.
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*/
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static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
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{
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struct net_device *new_dev;
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struct net *net = dev_net(real_dev);
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struct vlan_net *vn = net_generic(net, vlan_net_id);
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char name[IFNAMSIZ];
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int err;
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if (vlan_id >= VLAN_VID_MASK)
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return -ERANGE;
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err = vlan_check_real_dev(real_dev, vlan_id);
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if (err < 0)
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return err;
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/* Gotta set up the fields for the device. */
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switch (vn->name_type) {
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case VLAN_NAME_TYPE_RAW_PLUS_VID:
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/* name will look like: eth1.0005 */
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snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
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break;
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case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
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/* Put our vlan.VID in the name.
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* Name will look like: vlan5
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*/
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snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
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break;
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case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
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/* Put our vlan.VID in the name.
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* Name will look like: eth0.5
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*/
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snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
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break;
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case VLAN_NAME_TYPE_PLUS_VID:
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/* Put our vlan.VID in the name.
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* Name will look like: vlan0005
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*/
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default:
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snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
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}
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new_dev = alloc_netdev_mq(sizeof(struct vlan_dev_info), name,
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vlan_setup, real_dev->num_tx_queues);
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if (new_dev == NULL)
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return -ENOBUFS;
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netif_copy_real_num_queues(new_dev, real_dev);
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dev_net_set(new_dev, net);
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/* need 4 bytes for extra VLAN header info,
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* hope the underlying device can handle it.
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*/
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new_dev->mtu = real_dev->mtu;
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vlan_dev_info(new_dev)->vlan_id = vlan_id;
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vlan_dev_info(new_dev)->real_dev = real_dev;
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vlan_dev_info(new_dev)->dent = NULL;
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vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
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new_dev->rtnl_link_ops = &vlan_link_ops;
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err = register_vlan_dev(new_dev);
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if (err < 0)
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goto out_free_newdev;
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return 0;
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out_free_newdev:
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free_netdev(new_dev);
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return err;
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}
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static void vlan_sync_address(struct net_device *dev,
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struct net_device *vlandev)
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{
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struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
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/* May be called without an actual change */
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if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
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return;
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/* vlan address was different from the old address and is equal to
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* the new address */
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if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
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!compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
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dev_uc_del(dev, vlandev->dev_addr);
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/* vlan address was equal to the old address and is different from
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* the new address */
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if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
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compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
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dev_uc_add(dev, vlandev->dev_addr);
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memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
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}
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static void vlan_transfer_features(struct net_device *dev,
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struct net_device *vlandev)
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{
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unsigned long old_features = vlandev->features;
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vlandev->features &= ~dev->vlan_features;
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vlandev->features |= dev->features & dev->vlan_features;
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vlandev->gso_max_size = dev->gso_max_size;
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if (dev->features & NETIF_F_HW_VLAN_TX)
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vlandev->hard_header_len = dev->hard_header_len;
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else
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vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
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#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
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vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
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#endif
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vlandev->real_num_tx_queues = dev->real_num_tx_queues;
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BUG_ON(vlandev->real_num_tx_queues > vlandev->num_tx_queues);
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if (old_features != vlandev->features)
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netdev_features_change(vlandev);
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}
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static void __vlan_device_event(struct net_device *dev, unsigned long event)
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{
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switch (event) {
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case NETDEV_CHANGENAME:
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vlan_proc_rem_dev(dev);
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if (vlan_proc_add_dev(dev) < 0)
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pr_warning("8021q: failed to change proc name for %s\n",
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dev->name);
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break;
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case NETDEV_REGISTER:
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if (vlan_proc_add_dev(dev) < 0)
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pr_warning("8021q: failed to add proc entry for %s\n",
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dev->name);
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break;
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case NETDEV_UNREGISTER:
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vlan_proc_rem_dev(dev);
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break;
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}
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}
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static int vlan_device_event(struct notifier_block *unused, unsigned long event,
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void *ptr)
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{
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struct net_device *dev = ptr;
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struct vlan_group *grp;
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int i, flgs;
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struct net_device *vlandev;
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struct vlan_dev_info *vlan;
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LIST_HEAD(list);
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if (is_vlan_dev(dev))
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__vlan_device_event(dev, event);
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if ((event == NETDEV_UP) &&
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(dev->features & NETIF_F_HW_VLAN_FILTER) &&
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dev->netdev_ops->ndo_vlan_rx_add_vid) {
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pr_info("8021q: adding VLAN 0 to HW filter on device %s\n",
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dev->name);
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dev->netdev_ops->ndo_vlan_rx_add_vid(dev, 0);
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}
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grp = rtnl_dereference(dev->vlgrp);
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if (!grp)
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goto out;
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/* It is OK that we do not hold the group lock right now,
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* as we run under the RTNL lock.
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*/
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switch (event) {
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case NETDEV_CHANGE:
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/* Propagate real device state to vlan devices */
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for (i = 0; i < VLAN_N_VID; i++) {
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vlandev = vlan_group_get_device(grp, i);
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if (!vlandev)
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continue;
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netif_stacked_transfer_operstate(dev, vlandev);
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}
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break;
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case NETDEV_CHANGEADDR:
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/* Adjust unicast filters on underlying device */
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for (i = 0; i < VLAN_N_VID; i++) {
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vlandev = vlan_group_get_device(grp, i);
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if (!vlandev)
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continue;
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flgs = vlandev->flags;
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if (!(flgs & IFF_UP))
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continue;
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vlan_sync_address(dev, vlandev);
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}
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break;
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case NETDEV_CHANGEMTU:
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for (i = 0; i < VLAN_N_VID; i++) {
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vlandev = vlan_group_get_device(grp, i);
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if (!vlandev)
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continue;
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if (vlandev->mtu <= dev->mtu)
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continue;
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dev_set_mtu(vlandev, dev->mtu);
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}
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break;
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case NETDEV_FEAT_CHANGE:
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/* Propagate device features to underlying device */
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for (i = 0; i < VLAN_N_VID; i++) {
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vlandev = vlan_group_get_device(grp, i);
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if (!vlandev)
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continue;
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vlan_transfer_features(dev, vlandev);
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}
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break;
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case NETDEV_DOWN:
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/* Put all VLANs for this dev in the down state too. */
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for (i = 0; i < VLAN_N_VID; i++) {
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vlandev = vlan_group_get_device(grp, i);
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if (!vlandev)
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continue;
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flgs = vlandev->flags;
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if (!(flgs & IFF_UP))
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continue;
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vlan = vlan_dev_info(vlandev);
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if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
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dev_change_flags(vlandev, flgs & ~IFF_UP);
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netif_stacked_transfer_operstate(dev, vlandev);
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}
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break;
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case NETDEV_UP:
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/* Put all VLANs for this dev in the up state too. */
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for (i = 0; i < VLAN_N_VID; i++) {
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vlandev = vlan_group_get_device(grp, i);
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if (!vlandev)
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continue;
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flgs = vlandev->flags;
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|
if (flgs & IFF_UP)
|
|
continue;
|
|
|
|
vlan = vlan_dev_info(vlandev);
|
|
if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
|
|
dev_change_flags(vlandev, flgs | IFF_UP);
|
|
netif_stacked_transfer_operstate(dev, vlandev);
|
|
}
|
|
break;
|
|
|
|
case NETDEV_UNREGISTER:
|
|
/* twiddle thumbs on netns device moves */
|
|
if (dev->reg_state != NETREG_UNREGISTERING)
|
|
break;
|
|
|
|
/* Delete all VLANs for this dev. */
|
|
grp->killall = 1;
|
|
|
|
for (i = 0; i < VLAN_N_VID; i++) {
|
|
vlandev = vlan_group_get_device(grp, i);
|
|
if (!vlandev)
|
|
continue;
|
|
|
|
/* unregistration of last vlan destroys group, abort
|
|
* afterwards */
|
|
if (grp->nr_vlans == 1)
|
|
i = VLAN_N_VID;
|
|
|
|
unregister_vlan_dev(vlandev, &list);
|
|
}
|
|
unregister_netdevice_many(&list);
|
|
break;
|
|
|
|
case NETDEV_PRE_TYPE_CHANGE:
|
|
/* Forbid underlaying device to change its type. */
|
|
return NOTIFY_BAD;
|
|
}
|
|
|
|
out:
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block vlan_notifier_block __read_mostly = {
|
|
.notifier_call = vlan_device_event,
|
|
};
|
|
|
|
/*
|
|
* VLAN IOCTL handler.
|
|
* o execute requested action or pass command to the device driver
|
|
* arg is really a struct vlan_ioctl_args __user *.
|
|
*/
|
|
static int vlan_ioctl_handler(struct net *net, void __user *arg)
|
|
{
|
|
int err;
|
|
struct vlan_ioctl_args args;
|
|
struct net_device *dev = NULL;
|
|
|
|
if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
|
|
return -EFAULT;
|
|
|
|
/* Null terminate this sucker, just in case. */
|
|
args.device1[23] = 0;
|
|
args.u.device2[23] = 0;
|
|
|
|
rtnl_lock();
|
|
|
|
switch (args.cmd) {
|
|
case SET_VLAN_INGRESS_PRIORITY_CMD:
|
|
case SET_VLAN_EGRESS_PRIORITY_CMD:
|
|
case SET_VLAN_FLAG_CMD:
|
|
case ADD_VLAN_CMD:
|
|
case DEL_VLAN_CMD:
|
|
case GET_VLAN_REALDEV_NAME_CMD:
|
|
case GET_VLAN_VID_CMD:
|
|
err = -ENODEV;
|
|
dev = __dev_get_by_name(net, args.device1);
|
|
if (!dev)
|
|
goto out;
|
|
|
|
err = -EINVAL;
|
|
if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
|
|
goto out;
|
|
}
|
|
|
|
switch (args.cmd) {
|
|
case SET_VLAN_INGRESS_PRIORITY_CMD:
|
|
err = -EPERM;
|
|
if (!capable(CAP_NET_ADMIN))
|
|
break;
|
|
vlan_dev_set_ingress_priority(dev,
|
|
args.u.skb_priority,
|
|
args.vlan_qos);
|
|
err = 0;
|
|
break;
|
|
|
|
case SET_VLAN_EGRESS_PRIORITY_CMD:
|
|
err = -EPERM;
|
|
if (!capable(CAP_NET_ADMIN))
|
|
break;
|
|
err = vlan_dev_set_egress_priority(dev,
|
|
args.u.skb_priority,
|
|
args.vlan_qos);
|
|
break;
|
|
|
|
case SET_VLAN_FLAG_CMD:
|
|
err = -EPERM;
|
|
if (!capable(CAP_NET_ADMIN))
|
|
break;
|
|
err = vlan_dev_change_flags(dev,
|
|
args.vlan_qos ? args.u.flag : 0,
|
|
args.u.flag);
|
|
break;
|
|
|
|
case SET_VLAN_NAME_TYPE_CMD:
|
|
err = -EPERM;
|
|
if (!capable(CAP_NET_ADMIN))
|
|
break;
|
|
if ((args.u.name_type >= 0) &&
|
|
(args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
|
|
struct vlan_net *vn;
|
|
|
|
vn = net_generic(net, vlan_net_id);
|
|
vn->name_type = args.u.name_type;
|
|
err = 0;
|
|
} else {
|
|
err = -EINVAL;
|
|
}
|
|
break;
|
|
|
|
case ADD_VLAN_CMD:
|
|
err = -EPERM;
|
|
if (!capable(CAP_NET_ADMIN))
|
|
break;
|
|
err = register_vlan_device(dev, args.u.VID);
|
|
break;
|
|
|
|
case DEL_VLAN_CMD:
|
|
err = -EPERM;
|
|
if (!capable(CAP_NET_ADMIN))
|
|
break;
|
|
unregister_vlan_dev(dev, NULL);
|
|
err = 0;
|
|
break;
|
|
|
|
case GET_VLAN_REALDEV_NAME_CMD:
|
|
err = 0;
|
|
vlan_dev_get_realdev_name(dev, args.u.device2);
|
|
if (copy_to_user(arg, &args,
|
|
sizeof(struct vlan_ioctl_args)))
|
|
err = -EFAULT;
|
|
break;
|
|
|
|
case GET_VLAN_VID_CMD:
|
|
err = 0;
|
|
args.u.VID = vlan_dev_vlan_id(dev);
|
|
if (copy_to_user(arg, &args,
|
|
sizeof(struct vlan_ioctl_args)))
|
|
err = -EFAULT;
|
|
break;
|
|
|
|
default:
|
|
err = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
out:
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
|
|
static int __net_init vlan_init_net(struct net *net)
|
|
{
|
|
struct vlan_net *vn = net_generic(net, vlan_net_id);
|
|
int err;
|
|
|
|
vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
|
|
|
|
err = vlan_proc_init(net);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __net_exit vlan_exit_net(struct net *net)
|
|
{
|
|
vlan_proc_cleanup(net);
|
|
}
|
|
|
|
static struct pernet_operations vlan_net_ops = {
|
|
.init = vlan_init_net,
|
|
.exit = vlan_exit_net,
|
|
.id = &vlan_net_id,
|
|
.size = sizeof(struct vlan_net),
|
|
};
|
|
|
|
static int __init vlan_proto_init(void)
|
|
{
|
|
int err;
|
|
|
|
pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
|
|
pr_info("All bugs added by %s\n", vlan_buggyright);
|
|
|
|
err = register_pernet_subsys(&vlan_net_ops);
|
|
if (err < 0)
|
|
goto err0;
|
|
|
|
err = register_netdevice_notifier(&vlan_notifier_block);
|
|
if (err < 0)
|
|
goto err2;
|
|
|
|
err = vlan_gvrp_init();
|
|
if (err < 0)
|
|
goto err3;
|
|
|
|
err = vlan_netlink_init();
|
|
if (err < 0)
|
|
goto err4;
|
|
|
|
dev_add_pack(&vlan_packet_type);
|
|
vlan_ioctl_set(vlan_ioctl_handler);
|
|
return 0;
|
|
|
|
err4:
|
|
vlan_gvrp_uninit();
|
|
err3:
|
|
unregister_netdevice_notifier(&vlan_notifier_block);
|
|
err2:
|
|
unregister_pernet_subsys(&vlan_net_ops);
|
|
err0:
|
|
return err;
|
|
}
|
|
|
|
static void __exit vlan_cleanup_module(void)
|
|
{
|
|
vlan_ioctl_set(NULL);
|
|
vlan_netlink_fini();
|
|
|
|
unregister_netdevice_notifier(&vlan_notifier_block);
|
|
|
|
dev_remove_pack(&vlan_packet_type);
|
|
|
|
unregister_pernet_subsys(&vlan_net_ops);
|
|
rcu_barrier(); /* Wait for completion of call_rcu()'s */
|
|
|
|
vlan_gvrp_uninit();
|
|
}
|
|
|
|
module_init(vlan_proto_init);
|
|
module_exit(vlan_cleanup_module);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(DRV_VERSION);
|