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![Rami Rosen](/assets/img/avatar_default.png)
In drivers/net/macvlan.c, when rtnl_link_register() fails in macvlan_init_module(), there is no point to set it (second time in this method) to macvlan_handle_frame; macvlan_init_module() will return a negative number, so instead this patch sets macvlan_handle_frame_hook to NULL. Signed-off-by: Rami Rosen <ramirose@gmail.com> Acked-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
529 lines
13 KiB
C
529 lines
13 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/list.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_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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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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dev->last_rx = jiffies;
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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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dev->last_rx = jiffies;
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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_hard_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 macvlan_port *port = vlan->port;
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struct net_device *lowerdev = vlan->lowerdev;
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int err;
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err = dev_unicast_add(lowerdev, dev->dev_addr, ETH_ALEN);
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if (err < 0)
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return err;
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if (dev->flags & IFF_ALLMULTI)
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dev_set_allmulti(lowerdev, 1);
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hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[dev->dev_addr[5]]);
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return 0;
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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, ETH_ALEN);
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hlist_del_rcu(&vlan->hlist);
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synchronize_rcu();
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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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goto out;
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err = dev_unicast_add(lowerdev, addr->sa_data, ETH_ALEN);
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if (err < 0)
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return err;
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dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
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out:
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memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
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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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#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 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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lockdep_set_class(&dev->_xmit_lock, &macvlan_netdev_xmit_lock_key);
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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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struct net_device *lowerdev = vlan->lowerdev;
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if (lowerdev->ethtool_ops->get_rx_csum == NULL)
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return 0;
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return lowerdev->ethtool_ops->get_rx_csum(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_rx_csum = macvlan_ethtool_get_rx_csum,
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.get_drvinfo = macvlan_ethtool_get_drvinfo,
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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->init = macvlan_init;
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dev->open = macvlan_open;
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dev->stop = macvlan_stop;
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dev->change_mtu = macvlan_change_mtu;
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dev->change_rx_flags = macvlan_change_rx_flags;
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dev->set_mac_address = macvlan_set_mac_address;
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dev->set_multicast_list = macvlan_set_multicast_list;
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dev->hard_start_xmit = macvlan_hard_start_xmit;
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dev->destructor = free_netdev;
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dev->header_ops = &macvlan_hard_header_ops,
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dev->ethtool_ops = &macvlan_ethtool_ops;
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dev->tx_queue_len = 0;
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}
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static int macvlan_port_create(struct net_device *dev)
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{
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struct macvlan_port *port;
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unsigned int i;
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if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
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return -EINVAL;
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port = kzalloc(sizeof(*port), GFP_KERNEL);
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if (port == NULL)
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return -ENOMEM;
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port->dev = dev;
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INIT_LIST_HEAD(&port->vlans);
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for (i = 0; i < MACVLAN_HASH_SIZE; i++)
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INIT_HLIST_HEAD(&port->vlan_hash[i]);
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rcu_assign_pointer(dev->macvlan_port, port);
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return 0;
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}
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static void macvlan_port_destroy(struct net_device *dev)
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{
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struct macvlan_port *port = dev->macvlan_port;
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rcu_assign_pointer(dev->macvlan_port, NULL);
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synchronize_rcu();
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kfree(port);
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}
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static void macvlan_transfer_operstate(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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if (lowerdev->operstate == IF_OPER_DORMANT)
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netif_dormant_on(dev);
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else
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netif_dormant_off(dev);
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if (netif_carrier_ok(lowerdev)) {
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if (!netif_carrier_ok(dev))
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netif_carrier_on(dev);
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} else {
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if (netif_carrier_ok(dev))
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netif_carrier_off(dev);
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}
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}
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static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
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{
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if (tb[IFLA_ADDRESS]) {
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if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
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return -EINVAL;
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if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
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return -EADDRNOTAVAIL;
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}
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return 0;
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}
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static int macvlan_newlink(struct net_device *dev,
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struct nlattr *tb[], struct nlattr *data[])
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{
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struct macvlan_dev *vlan = netdev_priv(dev);
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struct macvlan_port *port;
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struct net_device *lowerdev;
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int err;
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if (!tb[IFLA_LINK])
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return -EINVAL;
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lowerdev = __dev_get_by_index(dev->nd_net, nla_get_u32(tb[IFLA_LINK]));
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if (lowerdev == NULL)
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return -ENODEV;
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/* Don't allow macvlans on top of other macvlans - its not really
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* wrong, but lockdep can't handle it and its not useful for anything
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* you couldn't do directly on top of the real device.
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*/
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if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops)
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return -ENODEV;
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if (!tb[IFLA_MTU])
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dev->mtu = lowerdev->mtu;
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else if (dev->mtu > lowerdev->mtu)
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return -EINVAL;
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if (!tb[IFLA_ADDRESS])
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random_ether_addr(dev->dev_addr);
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if (lowerdev->macvlan_port == NULL) {
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err = macvlan_port_create(lowerdev);
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if (err < 0)
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return err;
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}
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port = lowerdev->macvlan_port;
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vlan->lowerdev = lowerdev;
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vlan->dev = dev;
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vlan->port = port;
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err = register_netdevice(dev);
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if (err < 0)
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return err;
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list_add_tail(&vlan->list, &port->vlans);
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macvlan_transfer_operstate(dev);
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return 0;
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}
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static void macvlan_dellink(struct net_device *dev)
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{
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struct macvlan_dev *vlan = netdev_priv(dev);
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struct macvlan_port *port = vlan->port;
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list_del(&vlan->list);
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unregister_netdevice(dev);
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if (list_empty(&port->vlans))
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macvlan_port_destroy(dev);
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}
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static struct rtnl_link_ops macvlan_link_ops __read_mostly = {
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.kind = "macvlan",
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.priv_size = sizeof(struct macvlan_dev),
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.setup = macvlan_setup,
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.validate = macvlan_validate,
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.newlink = macvlan_newlink,
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.dellink = macvlan_dellink,
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};
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static int macvlan_device_event(struct notifier_block *unused,
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unsigned long event, void *ptr)
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{
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struct net_device *dev = ptr;
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struct macvlan_dev *vlan, *next;
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struct macvlan_port *port;
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port = dev->macvlan_port;
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if (port == NULL)
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return NOTIFY_DONE;
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switch (event) {
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case NETDEV_CHANGE:
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list_for_each_entry(vlan, &port->vlans, list)
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macvlan_transfer_operstate(vlan->dev);
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break;
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case NETDEV_FEAT_CHANGE:
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list_for_each_entry(vlan, &port->vlans, list) {
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vlan->dev->features = dev->features & MACVLAN_FEATURES;
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netdev_features_change(vlan->dev);
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}
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break;
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case NETDEV_UNREGISTER:
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list_for_each_entry_safe(vlan, next, &port->vlans, list)
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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");
|