881d966b48
This patch makes most of the generic device layer network namespace safe. This patch makes dev_base_head a network namespace variable, and then it picks up a few associated variables. The functions: dev_getbyhwaddr dev_getfirsthwbytype dev_get_by_flags dev_get_by_name __dev_get_by_name dev_get_by_index __dev_get_by_index dev_ioctl dev_ethtool dev_load wireless_process_ioctl were modified to take a network namespace argument, and deal with it. vlan_ioctl_set and brioctl_set were modified so their hooks will receive a network namespace argument. So basically anthing in the core of the network stack that was affected to by the change of dev_base was modified to handle multiple network namespaces. The rest of the network stack was simply modified to explicitly use &init_net the initial network namespace. This can be fixed when those components of the network stack are modified to handle multiple network namespaces. For now the ifindex generator is left global. Fundametally ifindex numbers are per namespace, or else we will have corner case problems with migration when we get that far. At the same time there are assumptions in the network stack that the ifindex of a network device won't change. Making the ifindex number global seems a good compromise until the network stack can cope with ifindex changes when you change namespaces, and the like. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
/* AFS network device helpers
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*
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* Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
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*/
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#include <linux/string.h>
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#include <linux/rtnetlink.h>
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#include <linux/inetdevice.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <net/net_namespace.h>
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#include "internal.h"
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/*
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* get a MAC address from a random ethernet interface that has a real one
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* - the buffer will normally be 6 bytes in size
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*/
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int afs_get_MAC_address(u8 *mac, size_t maclen)
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{
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struct net_device *dev;
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int ret = -ENODEV;
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if (maclen != ETH_ALEN)
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BUG();
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rtnl_lock();
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dev = __dev_getfirstbyhwtype(&init_net, ARPHRD_ETHER);
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if (dev) {
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memcpy(mac, dev->dev_addr, maclen);
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ret = 0;
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}
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rtnl_unlock();
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return ret;
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}
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/*
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* get a list of this system's interface IPv4 addresses, netmasks and MTUs
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* - maxbufs must be at least 1
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* - returns the number of interface records in the buffer
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*/
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int afs_get_ipv4_interfaces(struct afs_interface *bufs, size_t maxbufs,
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bool wantloopback)
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{
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struct net_device *dev;
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struct in_device *idev;
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int n = 0;
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ASSERT(maxbufs > 0);
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rtnl_lock();
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for_each_netdev(&init_net, dev) {
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if (dev->type == ARPHRD_LOOPBACK && !wantloopback)
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continue;
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idev = __in_dev_get_rtnl(dev);
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if (!idev)
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continue;
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for_primary_ifa(idev) {
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bufs[n].address.s_addr = ifa->ifa_address;
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bufs[n].netmask.s_addr = ifa->ifa_mask;
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bufs[n].mtu = dev->mtu;
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n++;
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if (n >= maxbufs)
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goto out;
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} endfor_ifa(idev);
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}
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out:
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rtnl_unlock();
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return n;
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}
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