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linux-sg2042
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[NET]: Make the loopback device per network namespace. 

This patch makes loopback_dev per network namespace.  Adding
code to create a different loopback device for each network
namespace and adding the code to free a loopback device
when a network namespace exits.

This patch modifies all users the loopback_dev so they
access it as init_net.loopback_dev, keeping all of the
code compiling and working.  A later pass will be needed to
update the users to use something other than the initial network
namespace.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman 2007-09-26 22:10:56 -07:00 committed by David S. Miller
parent 0cc217e16c
commit 2774c7aba6
13 changed files with 64 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/net/loopback.c
View File

@ -57,6 +57,7 @@
#include <linux/ip.h> #include <linux/ip.h>
#include <linux/tcp.h> #include <linux/tcp.h>
#include <linux/percpu.h> #include <linux/percpu.h>
#include <net/net_namespace.h>
struct pcpu_lstats { struct pcpu_lstats {
unsigned long packets; unsigned long packets;
@ -252,7 +253,7 @@ static void loopback_setup(struct net_device *dev)
} }
/* Setup and register the loopback device. */ /* Setup and register the loopback device. */
static int __init loopback_init(void) static int loopback_net_init(struct net *net)
{ {
struct net_device *dev; struct net_device *dev;
int err; int err;
@ -262,12 +263,13 @@ static int __init loopback_init(void)
if (!dev) if (!dev)
goto out; goto out;
dev->nd_net = net;
err = register_netdev(dev); err = register_netdev(dev);
if (err) if (err)
goto out_free_netdev; goto out_free_netdev;
err = 0; err = 0;
loopback_dev = dev; net->loopback_dev = dev;
out: out:
if (err) if (err)
@ -279,7 +281,21 @@ out_free_netdev:
goto out; goto out;
} }
fs_initcall(loopback_init); static void loopback_net_exit(struct net *net)
{
struct net_device *dev = net->loopback_dev;
struct net_device *loopback_dev; unregister_netdev(dev);
EXPORT_SYMBOL(loopback_dev); }
static struct pernet_operations loopback_net_ops = {
.init = loopback_net_init,
.exit = loopback_net_exit,
};
static int __init loopback_init(void)
{
return register_pernet_device(&loopback_net_ops);
}
fs_initcall(loopback_init);

1
include/linux/netdevice.h
View File

@ -742,7 +742,6 @@ struct packet_type {
#include <linux/interrupt.h> #include <linux/interrupt.h>
#include <linux/notifier.h> #include <linux/notifier.h>
extern struct net_device *loopback_dev; /* The loopback */
extern rwlock_t dev_base_lock; /* Device list lock */ extern rwlock_t dev_base_lock; /* Device list lock */

3
include/net/net_namespace.h
View File

@ -9,6 +9,7 @@
#include <linux/list.h> #include <linux/list.h>
struct proc_dir_entry; struct proc_dir_entry;
struct net_device;
struct net { struct net {
atomic_t count; /* To decided when the network atomic_t count; /* To decided when the network
* namespace should be freed. * namespace should be freed.
@ -23,6 +24,8 @@ struct net {
struct proc_dir_entry *proc_net_stat; struct proc_dir_entry *proc_net_stat;
struct proc_dir_entry *proc_net_root; struct proc_dir_entry *proc_net_root;
struct net_device *loopback_dev; /* The loopback */
struct list_head dev_base_head; struct list_head dev_base_head;
struct hlist_head *dev_name_head; struct hlist_head *dev_name_head;
struct hlist_head *dev_index_head; struct hlist_head *dev_index_head;

5
net/core/dst.c
View File

@ -18,6 +18,7 @@
#include <linux/types.h> #include <linux/types.h>
#include <net/net_namespace.h> #include <net/net_namespace.h>
#include <net/net_namespace.h>
#include <net/dst.h> #include <net/dst.h>
/* /*
@ -278,11 +279,11 @@ static inline void dst_ifdown(struct dst_entry *dst, struct net_device *dev,
if (!unregister) { if (!unregister) {
dst->input = dst->output = dst_discard; dst->input = dst->output = dst_discard;
} else { } else {
dst->dev = loopback_dev; dst->dev = init_net.loopback_dev;
dev_hold(dst->dev); dev_hold(dst->dev);
dev_put(dev); dev_put(dev);
if (dst->neighbour && dst->neighbour->dev == dev) { if (dst->neighbour && dst->neighbour->dev == dev) {
dst->neighbour->dev = loopback_dev; dst->neighbour->dev = init_net.loopback_dev;
dev_put(dev); dev_put(dev);
dev_hold(dst->neighbour->dev); dev_hold(dst->neighbour->dev);
} }

4
net/decnet/dn_dev.c
View File

@ -869,10 +869,10 @@ last_chance:
rv = dn_dev_get_first(dev, addr); rv = dn_dev_get_first(dev, addr);
read_unlock(&dev_base_lock); read_unlock(&dev_base_lock);
dev_put(dev); dev_put(dev);
if (rv == 0 || dev == loopback_dev) if (rv == 0 || dev == init_net.loopback_dev)
return rv; return rv;
} }
dev = loopback_dev; dev = init_net.loopback_dev;
dev_hold(dev); dev_hold(dev);
goto last_chance; goto last_chance;
} }

14
net/decnet/dn_route.c
View File

@ -887,7 +887,7 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *old
.scope = RT_SCOPE_UNIVERSE, .scope = RT_SCOPE_UNIVERSE,
} }, } },
.mark = oldflp->mark, .mark = oldflp->mark,
.iif = loopback_dev->ifindex, .iif = init_net.loopback_dev->ifindex,
.oif = oldflp->oif }; .oif = oldflp->oif };
struct dn_route *rt = NULL; struct dn_route *rt = NULL;
struct net_device *dev_out = NULL, *dev; struct net_device *dev_out = NULL, *dev;
@ -904,7 +904,7 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *old
"dn_route_output_slow: dst=%04x src=%04x mark=%d" "dn_route_output_slow: dst=%04x src=%04x mark=%d"
" iif=%d oif=%d\n", dn_ntohs(oldflp->fld_dst), " iif=%d oif=%d\n", dn_ntohs(oldflp->fld_dst),
dn_ntohs(oldflp->fld_src), dn_ntohs(oldflp->fld_src),
oldflp->mark, loopback_dev->ifindex, oldflp->oif); oldflp->mark, init_net.loopback_dev->ifindex, oldflp->oif);
/* If we have an output interface, verify its a DECnet device */ /* If we have an output interface, verify its a DECnet device */
if (oldflp->oif) { if (oldflp->oif) {
@ -957,7 +957,7 @@ source_ok:
err = -EADDRNOTAVAIL; err = -EADDRNOTAVAIL;
if (dev_out) if (dev_out)
dev_put(dev_out); dev_put(dev_out);
dev_out = loopback_dev; dev_out = init_net.loopback_dev;
dev_hold(dev_out); dev_hold(dev_out);
if (!fl.fld_dst) { if (!fl.fld_dst) {
fl.fld_dst = fl.fld_dst =
@ -966,7 +966,7 @@ source_ok:
if (!fl.fld_dst) if (!fl.fld_dst)
goto out; goto out;
} }
fl.oif = loopback_dev->ifindex; fl.oif = init_net.loopback_dev->ifindex;
res.type = RTN_LOCAL; res.type = RTN_LOCAL;
goto make_route; goto make_route;
} }
@ -1012,7 +1012,7 @@ source_ok:
if (dev_out) if (dev_out)
dev_put(dev_out); dev_put(dev_out);
if (dn_dev_islocal(neigh->dev, fl.fld_dst)) { if (dn_dev_islocal(neigh->dev, fl.fld_dst)) {
dev_out = loopback_dev; dev_out = init_net.loopback_dev;
res.type = RTN_LOCAL; res.type = RTN_LOCAL;
} else { } else {
dev_out = neigh->dev; dev_out = neigh->dev;
@ -1033,7 +1033,7 @@ source_ok:
/* Possible improvement - check all devices for local addr */ /* Possible improvement - check all devices for local addr */
if (dn_dev_islocal(dev_out, fl.fld_dst)) { if (dn_dev_islocal(dev_out, fl.fld_dst)) {
dev_put(dev_out); dev_put(dev_out);
dev_out = loopback_dev; dev_out = init_net.loopback_dev;
dev_hold(dev_out); dev_hold(dev_out);
res.type = RTN_LOCAL; res.type = RTN_LOCAL;
goto select_source; goto select_source;
@ -1069,7 +1069,7 @@ select_source:
fl.fld_src = fl.fld_dst; fl.fld_src = fl.fld_dst;
if (dev_out) if (dev_out)
dev_put(dev_out); dev_put(dev_out);
dev_out = loopback_dev; dev_out = init_net.loopback_dev;
dev_hold(dev_out); dev_hold(dev_out);
fl.oif = dev_out->ifindex; fl.oif = dev_out->ifindex;
if (res.fi) if (res.fi)

18
net/ipv4/route.c
View File

@ -1402,8 +1402,8 @@ static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
{ {
struct rtable *rt = (struct rtable *) dst; struct rtable *rt = (struct rtable *) dst;
struct in_device *idev = rt->idev; struct in_device *idev = rt->idev;
if (dev != loopback_dev && idev && idev->dev == dev) { if (dev != init_net.loopback_dev && idev && idev->dev == dev) {
struct in_device *loopback_idev = in_dev_get(loopback_dev); struct in_device *loopback_idev = in_dev_get(init_net.loopback_dev);
if (loopback_idev) { if (loopback_idev) {
rt->idev = loopback_idev; rt->idev = loopback_idev;
in_dev_put(idev); in_dev_put(idev);
@ -1555,7 +1555,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
#endif #endif
rth->rt_iif = rth->rt_iif =
rth->fl.iif = dev->ifindex; rth->fl.iif = dev->ifindex;
rth->u.dst.dev = loopback_dev; rth->u.dst.dev = init_net.loopback_dev;
dev_hold(rth->u.dst.dev); dev_hold(rth->u.dst.dev);
rth->idev = in_dev_get(rth->u.dst.dev); rth->idev = in_dev_get(rth->u.dst.dev);
rth->fl.oif = 0; rth->fl.oif = 0;
@ -1812,7 +1812,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
if (res.type == RTN_LOCAL) { if (res.type == RTN_LOCAL) {
int result; int result;
result = fib_validate_source(saddr, daddr, tos, result = fib_validate_source(saddr, daddr, tos,
loopback_dev->ifindex, init_net.loopback_dev->ifindex,
dev, &spec_dst, &itag); dev, &spec_dst, &itag);
if (result < 0) if (result < 0)
goto martian_source; goto martian_source;
@ -1879,7 +1879,7 @@ local_input:
#endif #endif
rth->rt_iif = rth->rt_iif =
rth->fl.iif = dev->ifindex; rth->fl.iif = dev->ifindex;
rth->u.dst.dev = loopback_dev; rth->u.dst.dev = init_net.loopback_dev;
dev_hold(rth->u.dst.dev); dev_hold(rth->u.dst.dev);
rth->idev = in_dev_get(rth->u.dst.dev); rth->idev = in_dev_get(rth->u.dst.dev);
rth->rt_gateway = daddr; rth->rt_gateway = daddr;
@ -2149,7 +2149,7 @@ static int ip_route_output_slow(struct rtable **rp, const struct flowi *oldflp)
RT_SCOPE_UNIVERSE), RT_SCOPE_UNIVERSE),
} }, } },
.mark = oldflp->mark, .mark = oldflp->mark,
.iif = loopback_dev->ifindex, .iif = init_net.loopback_dev->ifindex,
.oif = oldflp->oif }; .oif = oldflp->oif };
struct fib_result res; struct fib_result res;
unsigned flags = 0; unsigned flags = 0;
@ -2243,9 +2243,9 @@ static int ip_route_output_slow(struct rtable **rp, const struct flowi *oldflp)
fl.fl4_dst = fl.fl4_src = htonl(INADDR_LOOPBACK); fl.fl4_dst = fl.fl4_src = htonl(INADDR_LOOPBACK);
if (dev_out) if (dev_out)
dev_put(dev_out); dev_put(dev_out);
dev_out = loopback_dev; dev_out = init_net.loopback_dev;
dev_hold(dev_out); dev_hold(dev_out);
fl.oif = loopback_dev->ifindex; fl.oif = init_net.loopback_dev->ifindex;
res.type = RTN_LOCAL; res.type = RTN_LOCAL;
flags |= RTCF_LOCAL; flags |= RTCF_LOCAL;
goto make_route; goto make_route;
@ -2290,7 +2290,7 @@ static int ip_route_output_slow(struct rtable **rp, const struct flowi *oldflp)
fl.fl4_src = fl.fl4_dst; fl.fl4_src = fl.fl4_dst;
if (dev_out) if (dev_out)
dev_put(dev_out); dev_put(dev_out);
dev_out = loopback_dev; dev_out = init_net.loopback_dev;
dev_hold(dev_out); dev_hold(dev_out);
fl.oif = dev_out->ifindex; fl.oif = dev_out->ifindex;
if (res.fi) if (res.fi)

2
net/ipv4/xfrm4_policy.c
View File

@ -306,7 +306,7 @@ static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
xdst = (struct xfrm_dst *)dst; xdst = (struct xfrm_dst *)dst;
if (xdst->u.rt.idev->dev == dev) { if (xdst->u.rt.idev->dev == dev) {
struct in_device *loopback_idev = in_dev_get(loopback_dev); struct in_device *loopback_idev = in_dev_get(init_net.loopback_dev);
BUG_ON(!loopback_idev); BUG_ON(!loopback_idev);
do { do {

18
net/ipv6/addrconf.c
View File

@ -2410,7 +2410,7 @@ static int addrconf_ifdown(struct net_device *dev, int how)
ASSERT_RTNL(); ASSERT_RTNL();
if (dev == loopback_dev && how == 1) if (dev == init_net.loopback_dev && how == 1)
how = 0; how = 0;
rt6_ifdown(dev); rt6_ifdown(dev);
@ -4212,19 +4212,19 @@ int __init addrconf_init(void)
* device and it being up should be removed. * device and it being up should be removed.
*/ */
rtnl_lock(); rtnl_lock();
if (!ipv6_add_dev(loopback_dev)) if (!ipv6_add_dev(init_net.loopback_dev))
err = -ENOMEM; err = -ENOMEM;
rtnl_unlock(); rtnl_unlock();
if (err) if (err)
return err; return err;
ip6_null_entry.u.dst.dev = loopback_dev; ip6_null_entry.u.dst.dev = init_net.loopback_dev;
ip6_null_entry.rt6i_idev = in6_dev_get(loopback_dev); ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES #ifdef CONFIG_IPV6_MULTIPLE_TABLES
ip6_prohibit_entry.u.dst.dev = loopback_dev; ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
ip6_prohibit_entry.rt6i_idev = in6_dev_get(loopback_dev); ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
ip6_blk_hole_entry.u.dst.dev = loopback_dev; ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
ip6_blk_hole_entry.rt6i_idev = in6_dev_get(loopback_dev); ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
#endif #endif
register_netdevice_notifier(&ipv6_dev_notf); register_netdevice_notifier(&ipv6_dev_notf);
@ -4279,7 +4279,7 @@ void __exit addrconf_cleanup(void)
continue; continue;
addrconf_ifdown(dev, 1); addrconf_ifdown(dev, 1);
} }
addrconf_ifdown(loopback_dev, 2); addrconf_ifdown(init_net.loopback_dev, 2);
/* /*
* Check hash table. * Check hash table.

2
net/ipv6/netfilter/ip6t_REJECT.c
View File

@ -167,7 +167,7 @@ static inline void
send_unreach(struct sk_buff *skb_in, unsigned char code, unsigned int hooknum) send_unreach(struct sk_buff *skb_in, unsigned char code, unsigned int hooknum)
{ {
if (hooknum == NF_IP6_LOCAL_OUT && skb_in->dev == NULL) if (hooknum == NF_IP6_LOCAL_OUT && skb_in->dev == NULL)
skb_in->dev = loopback_dev; skb_in->dev = init_net.loopback_dev;
icmpv6_send(skb_in, ICMPV6_DEST_UNREACH, code, 0, NULL); icmpv6_send(skb_in, ICMPV6_DEST_UNREACH, code, 0, NULL);
} }

12
net/ipv6/route.c
View File

@ -221,8 +221,8 @@ static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
struct rt6_info *rt = (struct rt6_info *)dst; struct rt6_info *rt = (struct rt6_info *)dst;
struct inet6_dev *idev = rt->rt6i_idev; struct inet6_dev *idev = rt->rt6i_idev;
if (dev != loopback_dev && idev != NULL && idev->dev == dev) { if (dev != init_net.loopback_dev && idev != NULL && idev->dev == dev) {
struct inet6_dev *loopback_idev = in6_dev_get(loopback_dev); struct inet6_dev *loopback_idev = in6_dev_get(init_net.loopback_dev);
if (loopback_idev != NULL) { if (loopback_idev != NULL) {
rt->rt6i_idev = loopback_idev; rt->rt6i_idev = loopback_idev;
in6_dev_put(idev); in6_dev_put(idev);
@ -1185,12 +1185,12 @@ int ip6_route_add(struct fib6_config *cfg)
if ((cfg->fc_flags & RTF_REJECT) || if ((cfg->fc_flags & RTF_REJECT) ||
(dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
/* hold loopback dev/idev if we haven't done so. */ /* hold loopback dev/idev if we haven't done so. */
if (dev != loopback_dev) { if (dev != init_net.loopback_dev) {
if (dev) { if (dev) {
dev_put(dev); dev_put(dev);
in6_dev_put(idev); in6_dev_put(idev);
} }
dev = loopback_dev; dev = init_net.loopback_dev;
dev_hold(dev); dev_hold(dev);
idev = in6_dev_get(dev); idev = in6_dev_get(dev);
if (!idev) { if (!idev) {
@ -1894,13 +1894,13 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
if (rt == NULL) if (rt == NULL)
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);
dev_hold(loopback_dev); dev_hold(init_net.loopback_dev);
in6_dev_hold(idev); in6_dev_hold(idev);
rt->u.dst.flags = DST_HOST; rt->u.dst.flags = DST_HOST;
rt->u.dst.input = ip6_input; rt->u.dst.input = ip6_input;
rt->u.dst.output = ip6_output; rt->u.dst.output = ip6_output;
rt->rt6i_dev = loopback_dev; rt->rt6i_dev = init_net.loopback_dev;
rt->rt6i_idev = idev; rt->rt6i_idev = idev;
rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));

2
net/ipv6/xfrm6_policy.c
View File

@ -375,7 +375,7 @@ static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
xdst = (struct xfrm_dst *)dst; xdst = (struct xfrm_dst *)dst;
if (xdst->u.rt6.rt6i_idev->dev == dev) { if (xdst->u.rt6.rt6i_idev->dev == dev) {
struct inet6_dev *loopback_idev = in6_dev_get(loopback_dev); struct inet6_dev *loopback_idev = in6_dev_get(init_net.loopback_dev);
BUG_ON(!loopback_idev); BUG_ON(!loopback_idev);
do { do {

2
net/xfrm/xfrm_policy.c
View File

@ -1949,7 +1949,7 @@ static int stale_bundle(struct dst_entry *dst)
void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
{ {
while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
dst->dev = loopback_dev; dst->dev = init_net.loopback_dev;
dev_hold(dst->dev); dev_hold(dst->dev);
dev_put(dev); dev_put(dev);
} }