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![sg.tweak@gmail.com](/assets/img/avatar_default.png)
Addresses http://bugzilla.kernel.org/show_bug.cgi?id=13348 akpm: the reporter disappeared, so I typed it in again. It is not possible to make clone of tagged VLAN interface to be used as mac-based vlan interfave. How reproducible: Use any 802.1q tagged vlan interface, e.g. eth2.700 and clone it: ip link add link eth2.700 address 00:04:75:cb:38:09 macvlan0 type macvlan ip link set dev macvlan0 up ip addr add 10.195.1.1/24 dev macvlan0 So far, so good. Now try to ping anything via macvlan0: ping 10.195.1.2 Actual results: For every attempted packet tx kernel writes to console: ------------[ cut here ]------------ WARNING: at net/8021q/vlan_dev.c:254 vlan_dev_hard_header+0x36/0x126 [8021q]() Hardware name: M22ES Modules linked in: arptable_filter arp_tables bridge veth macvlan arc4 ecb ppp_mppe ppp_async crc_ccitt ppp_generic slhc autofs4 sunrpc 8021q garp stp ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack xt_tcpudp x_tables dm_mirror dm_region_hash dm_log dm_multipath dm_mod sbs sbshc lp floppy snd_intel8x0 joydev snd_seq_dummy snd_intel8x0m snd_ac97_codec ide_cd_mod ac97_bus snd_seq_oss cdrom snd_seq_midi_event serio_raw snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss parport_pc snd_pcm parport battery 8139cp snd_timer i2c_sis96x ac button snd rtc_cmos rtc_core 8139too soundcore rtc_lib mii i2c_core pcspkr snd_page_alloc pata_sis libata sd_mod scsi_mod ext3 jbd ehci_hcd ohci_hcd uhci_hcd [last unloaded: ip_tables] Pid: 0, comm: swapper Tainted: G W 2.6.29.3 #1 Call Trace: [<c0425f48>] warn_slowpath+0x60/0x9f [<c0425f6f>] warn_slowpath+0x87/0x9f [<dffb850d>] vlan_dev_hard_header+0x0/0x126 [8021q] [<dffb8543>] vlan_dev_hard_header+0x36/0x126 [8021q] [<dffb850d>] vlan_dev_hard_header+0x0/0x126 [8021q] [<df83155d>] macvlan_hard_header+0x3c/0x47 [macvlan] [<df831521>] macvlan_hard_header+0x0/0x47 [macvlan] [<c062bf3f>] arp_create+0xef/0x1ff [<c062c08c>] arp_send+0x3d/0x54 [<c062c916>] arp_solicit+0x16c/0x177 [<c05fadd2>] neigh_timer_handler+0x227/0x269 [<c05fabab>] neigh_timer_handler+0x0/0x269 [<c042ce4d>] run_timer_softirq+0xf0/0x141 [<c0429e5a>] __do_softirq+0x76/0xf8 [<c0429de4>] __do_softirq+0x0/0xf8 <IRQ> [<c044fb67>] handle_level_irq+0x0/0xad [<c0429db7>] irq_exit+0x35/0x62 [<c04046bb>] do_IRQ+0xdf/0xf4 [<c04035a7>] common_interrupt+0x27/0x2c [<c04079c5>] default_idle+0x2a/0x3d [<c0401bb6>] cpu_idle+0x57/0x70 Macvlan driver always uses standard ethernet header length for all types of interface to which it is linked. This patch fixes this problem. Reported-by: <sg.tweak@gmail.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: "David S. Miller" <davem@davemloft.net> Cc: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
622 lines
15 KiB
C
622 lines
15 KiB
C
/*
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* Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
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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 as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* The code this is based on carried the following copyright notice:
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* ---
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* (C) Copyright 2001-2006
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* Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
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* Re-worked by Ben Greear <greearb@candelatech.com>
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* ---
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/rculist.h>
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#include <linux/notifier.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/if_arp.h>
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#include <linux/if_link.h>
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#include <linux/if_macvlan.h>
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#include <net/rtnetlink.h>
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#define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
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struct macvlan_port {
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struct net_device *dev;
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struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
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struct list_head vlans;
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};
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struct macvlan_dev {
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struct net_device *dev;
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struct list_head list;
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struct hlist_node hlist;
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struct macvlan_port *port;
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struct net_device *lowerdev;
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};
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static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
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const unsigned char *addr)
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{
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struct macvlan_dev *vlan;
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struct hlist_node *n;
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hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
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if (!compare_ether_addr(vlan->dev->dev_addr, addr))
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return vlan;
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}
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return NULL;
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}
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static void macvlan_hash_add(struct macvlan_dev *vlan)
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{
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struct macvlan_port *port = vlan->port;
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const unsigned char *addr = vlan->dev->dev_addr;
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hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
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}
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static void macvlan_hash_del(struct macvlan_dev *vlan)
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{
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hlist_del_rcu(&vlan->hlist);
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synchronize_rcu();
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}
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static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
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const unsigned char *addr)
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{
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macvlan_hash_del(vlan);
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/* Now that we are unhashed it is safe to change the device
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* address without confusing packet delivery.
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*/
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memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
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macvlan_hash_add(vlan);
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}
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static int macvlan_addr_busy(const struct macvlan_port *port,
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const unsigned char *addr)
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{
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/* Test to see if the specified multicast address is
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* currently in use by the underlying device or
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* another macvlan.
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*/
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if (memcmp(port->dev->dev_addr, addr, ETH_ALEN) == 0)
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return 1;
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if (macvlan_hash_lookup(port, addr))
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return 1;
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return 0;
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}
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static void macvlan_broadcast(struct sk_buff *skb,
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const struct macvlan_port *port)
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{
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const struct ethhdr *eth = eth_hdr(skb);
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const struct macvlan_dev *vlan;
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struct hlist_node *n;
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struct net_device *dev;
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struct sk_buff *nskb;
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unsigned int i;
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if (skb->protocol == htons(ETH_P_PAUSE))
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return;
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for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
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hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
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dev = vlan->dev;
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nskb = skb_clone(skb, GFP_ATOMIC);
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if (nskb == NULL) {
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dev->stats.rx_errors++;
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dev->stats.rx_dropped++;
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continue;
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}
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dev->stats.rx_bytes += skb->len + ETH_HLEN;
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dev->stats.rx_packets++;
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dev->stats.multicast++;
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nskb->dev = dev;
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if (!compare_ether_addr(eth->h_dest, dev->broadcast))
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nskb->pkt_type = PACKET_BROADCAST;
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else
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nskb->pkt_type = PACKET_MULTICAST;
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netif_rx(nskb);
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}
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}
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}
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/* called under rcu_read_lock() from netif_receive_skb */
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static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
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{
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const struct ethhdr *eth = eth_hdr(skb);
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const struct macvlan_port *port;
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const struct macvlan_dev *vlan;
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struct net_device *dev;
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port = rcu_dereference(skb->dev->macvlan_port);
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if (port == NULL)
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return skb;
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if (is_multicast_ether_addr(eth->h_dest)) {
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macvlan_broadcast(skb, port);
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return skb;
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}
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vlan = macvlan_hash_lookup(port, eth->h_dest);
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if (vlan == NULL)
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return skb;
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dev = vlan->dev;
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if (unlikely(!(dev->flags & IFF_UP))) {
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kfree_skb(skb);
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return NULL;
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}
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skb = skb_share_check(skb, GFP_ATOMIC);
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if (skb == NULL) {
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dev->stats.rx_errors++;
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dev->stats.rx_dropped++;
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return NULL;
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}
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dev->stats.rx_bytes += skb->len + ETH_HLEN;
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dev->stats.rx_packets++;
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skb->dev = dev;
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skb->pkt_type = PACKET_HOST;
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netif_rx(skb);
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return NULL;
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}
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static int macvlan_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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const struct macvlan_dev *vlan = netdev_priv(dev);
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unsigned int len = skb->len;
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int ret;
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skb->dev = vlan->lowerdev;
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ret = dev_queue_xmit(skb);
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if (likely(ret == NET_XMIT_SUCCESS)) {
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += len;
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} else {
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dev->stats.tx_errors++;
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dev->stats.tx_aborted_errors++;
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}
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return NETDEV_TX_OK;
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}
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static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
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unsigned short type, const void *daddr,
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const void *saddr, unsigned len)
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{
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const struct macvlan_dev *vlan = netdev_priv(dev);
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struct net_device *lowerdev = vlan->lowerdev;
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return dev_hard_header(skb, lowerdev, type, daddr,
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saddr ? : dev->dev_addr, len);
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}
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static const struct header_ops macvlan_hard_header_ops = {
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.create = macvlan_hard_header,
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.rebuild = eth_rebuild_header,
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.parse = eth_header_parse,
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.cache = eth_header_cache,
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.cache_update = eth_header_cache_update,
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};
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static int macvlan_open(struct net_device *dev)
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{
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struct macvlan_dev *vlan = netdev_priv(dev);
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struct net_device *lowerdev = vlan->lowerdev;
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int err;
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err = -EBUSY;
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if (macvlan_addr_busy(vlan->port, dev->dev_addr))
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goto out;
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err = dev_unicast_add(lowerdev, dev->dev_addr);
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if (err < 0)
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goto out;
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if (dev->flags & IFF_ALLMULTI) {
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err = dev_set_allmulti(lowerdev, 1);
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if (err < 0)
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goto del_unicast;
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}
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macvlan_hash_add(vlan);
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return 0;
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del_unicast:
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dev_unicast_delete(lowerdev, dev->dev_addr);
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out:
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return err;
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}
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static int macvlan_stop(struct net_device *dev)
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{
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struct macvlan_dev *vlan = netdev_priv(dev);
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struct net_device *lowerdev = vlan->lowerdev;
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dev_mc_unsync(lowerdev, dev);
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if (dev->flags & IFF_ALLMULTI)
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dev_set_allmulti(lowerdev, -1);
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dev_unicast_delete(lowerdev, dev->dev_addr);
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macvlan_hash_del(vlan);
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return 0;
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}
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static int macvlan_set_mac_address(struct net_device *dev, void *p)
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{
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struct macvlan_dev *vlan = netdev_priv(dev);
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struct net_device *lowerdev = vlan->lowerdev;
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struct sockaddr *addr = p;
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int err;
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if (!is_valid_ether_addr(addr->sa_data))
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return -EADDRNOTAVAIL;
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if (!(dev->flags & IFF_UP)) {
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/* Just copy in the new address */
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memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
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} else {
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/* Rehash and update the device filters */
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if (macvlan_addr_busy(vlan->port, addr->sa_data))
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return -EBUSY;
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err = dev_unicast_add(lowerdev, addr->sa_data);
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if (err)
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return err;
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dev_unicast_delete(lowerdev, dev->dev_addr);
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macvlan_hash_change_addr(vlan, addr->sa_data);
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}
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return 0;
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}
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static void macvlan_change_rx_flags(struct net_device *dev, int change)
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{
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struct macvlan_dev *vlan = netdev_priv(dev);
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struct net_device *lowerdev = vlan->lowerdev;
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if (change & IFF_ALLMULTI)
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dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
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}
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static void macvlan_set_multicast_list(struct net_device *dev)
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{
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struct macvlan_dev *vlan = netdev_priv(dev);
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dev_mc_sync(vlan->lowerdev, dev);
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}
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static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
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{
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struct macvlan_dev *vlan = netdev_priv(dev);
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if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
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return -EINVAL;
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dev->mtu = new_mtu;
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return 0;
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}
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/*
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* macvlan network devices have devices nesting below it and are a special
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* "super class" of normal network devices; split their locks off into a
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* separate class since they always nest.
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*/
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static struct lock_class_key macvlan_netdev_xmit_lock_key;
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static struct lock_class_key macvlan_netdev_addr_lock_key;
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#define MACVLAN_FEATURES \
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(NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
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NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
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NETIF_F_TSO_ECN | NETIF_F_TSO6)
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#define MACVLAN_STATE_MASK \
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((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
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static void macvlan_set_lockdep_class_one(struct net_device *dev,
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struct netdev_queue *txq,
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void *_unused)
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{
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lockdep_set_class(&txq->_xmit_lock,
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&macvlan_netdev_xmit_lock_key);
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}
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static void macvlan_set_lockdep_class(struct net_device *dev)
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{
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lockdep_set_class(&dev->addr_list_lock,
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&macvlan_netdev_addr_lock_key);
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netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
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}
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static int macvlan_init(struct net_device *dev)
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{
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struct macvlan_dev *vlan = netdev_priv(dev);
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const struct net_device *lowerdev = vlan->lowerdev;
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dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
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(lowerdev->state & MACVLAN_STATE_MASK);
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dev->features = lowerdev->features & MACVLAN_FEATURES;
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dev->iflink = lowerdev->ifindex;
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dev->hard_header_len = lowerdev->hard_header_len;
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macvlan_set_lockdep_class(dev);
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return 0;
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}
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static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
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struct ethtool_drvinfo *drvinfo)
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{
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snprintf(drvinfo->driver, 32, "macvlan");
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snprintf(drvinfo->version, 32, "0.1");
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}
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static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev)
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{
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const struct macvlan_dev *vlan = netdev_priv(dev);
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return dev_ethtool_get_rx_csum(vlan->lowerdev);
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}
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static int macvlan_ethtool_get_settings(struct net_device *dev,
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struct ethtool_cmd *cmd)
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{
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const struct macvlan_dev *vlan = netdev_priv(dev);
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return dev_ethtool_get_settings(vlan->lowerdev, cmd);
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}
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static u32 macvlan_ethtool_get_flags(struct net_device *dev)
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{
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const struct macvlan_dev *vlan = netdev_priv(dev);
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return dev_ethtool_get_flags(vlan->lowerdev);
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}
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static const struct ethtool_ops macvlan_ethtool_ops = {
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.get_link = ethtool_op_get_link,
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.get_settings = macvlan_ethtool_get_settings,
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.get_rx_csum = macvlan_ethtool_get_rx_csum,
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.get_drvinfo = macvlan_ethtool_get_drvinfo,
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.get_flags = macvlan_ethtool_get_flags,
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};
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static const struct net_device_ops macvlan_netdev_ops = {
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.ndo_init = macvlan_init,
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.ndo_open = macvlan_open,
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.ndo_stop = macvlan_stop,
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.ndo_start_xmit = macvlan_start_xmit,
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.ndo_change_mtu = macvlan_change_mtu,
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.ndo_change_rx_flags = macvlan_change_rx_flags,
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.ndo_set_mac_address = macvlan_set_mac_address,
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.ndo_set_multicast_list = macvlan_set_multicast_list,
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.ndo_validate_addr = eth_validate_addr,
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};
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static void macvlan_setup(struct net_device *dev)
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{
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ether_setup(dev);
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dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
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dev->netdev_ops = &macvlan_netdev_ops;
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dev->destructor = free_netdev;
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dev->header_ops = &macvlan_hard_header_ops,
|
|
dev->ethtool_ops = &macvlan_ethtool_ops;
|
|
dev->tx_queue_len = 0;
|
|
}
|
|
|
|
static int macvlan_port_create(struct net_device *dev)
|
|
{
|
|
struct macvlan_port *port;
|
|
unsigned int i;
|
|
|
|
if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
|
|
return -EINVAL;
|
|
|
|
port = kzalloc(sizeof(*port), GFP_KERNEL);
|
|
if (port == NULL)
|
|
return -ENOMEM;
|
|
|
|
port->dev = dev;
|
|
INIT_LIST_HEAD(&port->vlans);
|
|
for (i = 0; i < MACVLAN_HASH_SIZE; i++)
|
|
INIT_HLIST_HEAD(&port->vlan_hash[i]);
|
|
rcu_assign_pointer(dev->macvlan_port, port);
|
|
return 0;
|
|
}
|
|
|
|
static void macvlan_port_destroy(struct net_device *dev)
|
|
{
|
|
struct macvlan_port *port = dev->macvlan_port;
|
|
|
|
rcu_assign_pointer(dev->macvlan_port, NULL);
|
|
synchronize_rcu();
|
|
kfree(port);
|
|
}
|
|
|
|
static void macvlan_transfer_operstate(struct net_device *dev)
|
|
{
|
|
struct macvlan_dev *vlan = netdev_priv(dev);
|
|
const struct net_device *lowerdev = vlan->lowerdev;
|
|
|
|
if (lowerdev->operstate == IF_OPER_DORMANT)
|
|
netif_dormant_on(dev);
|
|
else
|
|
netif_dormant_off(dev);
|
|
|
|
if (netif_carrier_ok(lowerdev)) {
|
|
if (!netif_carrier_ok(dev))
|
|
netif_carrier_on(dev);
|
|
} else {
|
|
if (netif_carrier_ok(dev))
|
|
netif_carrier_off(dev);
|
|
}
|
|
}
|
|
|
|
static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
if (tb[IFLA_ADDRESS]) {
|
|
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
|
|
return -EINVAL;
|
|
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int macvlan_newlink(struct net_device *dev,
|
|
struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
struct macvlan_dev *vlan = netdev_priv(dev);
|
|
struct macvlan_port *port;
|
|
struct net_device *lowerdev;
|
|
int err;
|
|
|
|
if (!tb[IFLA_LINK])
|
|
return -EINVAL;
|
|
|
|
lowerdev = __dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK]));
|
|
if (lowerdev == NULL)
|
|
return -ENODEV;
|
|
|
|
/* When creating macvlans on top of other macvlans - use
|
|
* the real device as the lowerdev.
|
|
*/
|
|
if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
|
|
struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
|
|
lowerdev = lowervlan->lowerdev;
|
|
}
|
|
|
|
if (!tb[IFLA_MTU])
|
|
dev->mtu = lowerdev->mtu;
|
|
else if (dev->mtu > lowerdev->mtu)
|
|
return -EINVAL;
|
|
|
|
if (!tb[IFLA_ADDRESS])
|
|
random_ether_addr(dev->dev_addr);
|
|
|
|
if (lowerdev->macvlan_port == NULL) {
|
|
err = macvlan_port_create(lowerdev);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
port = lowerdev->macvlan_port;
|
|
|
|
vlan->lowerdev = lowerdev;
|
|
vlan->dev = dev;
|
|
vlan->port = port;
|
|
|
|
err = register_netdevice(dev);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
list_add_tail(&vlan->list, &port->vlans);
|
|
macvlan_transfer_operstate(dev);
|
|
return 0;
|
|
}
|
|
|
|
static void macvlan_dellink(struct net_device *dev)
|
|
{
|
|
struct macvlan_dev *vlan = netdev_priv(dev);
|
|
struct macvlan_port *port = vlan->port;
|
|
|
|
list_del(&vlan->list);
|
|
unregister_netdevice(dev);
|
|
|
|
if (list_empty(&port->vlans))
|
|
macvlan_port_destroy(port->dev);
|
|
}
|
|
|
|
static struct rtnl_link_ops macvlan_link_ops __read_mostly = {
|
|
.kind = "macvlan",
|
|
.priv_size = sizeof(struct macvlan_dev),
|
|
.setup = macvlan_setup,
|
|
.validate = macvlan_validate,
|
|
.newlink = macvlan_newlink,
|
|
.dellink = macvlan_dellink,
|
|
};
|
|
|
|
static int macvlan_device_event(struct notifier_block *unused,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = ptr;
|
|
struct macvlan_dev *vlan, *next;
|
|
struct macvlan_port *port;
|
|
|
|
port = dev->macvlan_port;
|
|
if (port == NULL)
|
|
return NOTIFY_DONE;
|
|
|
|
switch (event) {
|
|
case NETDEV_CHANGE:
|
|
list_for_each_entry(vlan, &port->vlans, list)
|
|
macvlan_transfer_operstate(vlan->dev);
|
|
break;
|
|
case NETDEV_FEAT_CHANGE:
|
|
list_for_each_entry(vlan, &port->vlans, list) {
|
|
vlan->dev->features = dev->features & MACVLAN_FEATURES;
|
|
netdev_features_change(vlan->dev);
|
|
}
|
|
break;
|
|
case NETDEV_UNREGISTER:
|
|
list_for_each_entry_safe(vlan, next, &port->vlans, list)
|
|
macvlan_dellink(vlan->dev);
|
|
break;
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block macvlan_notifier_block __read_mostly = {
|
|
.notifier_call = macvlan_device_event,
|
|
};
|
|
|
|
static int __init macvlan_init_module(void)
|
|
{
|
|
int err;
|
|
|
|
register_netdevice_notifier(&macvlan_notifier_block);
|
|
macvlan_handle_frame_hook = macvlan_handle_frame;
|
|
|
|
err = rtnl_link_register(&macvlan_link_ops);
|
|
if (err < 0)
|
|
goto err1;
|
|
return 0;
|
|
err1:
|
|
macvlan_handle_frame_hook = NULL;
|
|
unregister_netdevice_notifier(&macvlan_notifier_block);
|
|
return err;
|
|
}
|
|
|
|
static void __exit macvlan_cleanup_module(void)
|
|
{
|
|
rtnl_link_unregister(&macvlan_link_ops);
|
|
macvlan_handle_frame_hook = NULL;
|
|
unregister_netdevice_notifier(&macvlan_notifier_block);
|
|
}
|
|
|
|
module_init(macvlan_init_module);
|
|
module_exit(macvlan_cleanup_module);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
|
|
MODULE_DESCRIPTION("Driver for MAC address based VLANs");
|
|
MODULE_ALIAS_RTNL_LINK("macvlan");
|