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[NET]: Dynamically allocate the loopback device, part 1.

Browse Source 
This patch replaces all occurences to the static variable
loopback_dev to a pointer loopback_dev. That provides the
mindless, trivial, uninteressting change part for the dynamic
allocation for the loopback.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Acked-By: Kirill Korotaev <dev@sw.ru>
Acked-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Lezcano 2007-09-25 19:16:28 -07:00 committed by David S. Miller
parent 5568296573
commit de3cb747ff
16 changed files with 55 additions and 53 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/loopback.c
View File

@ -202,7 +202,7 @@ static const struct ethtool_ops loopback_ethtool_ops = {
* The loopback device is special. There is only one instance and
* it is statically allocated. Don't do this for other devices.
*/
struct net_device loopback_dev = {
struct net_device __loopback_dev = {
.name = "lo",
.get_stats = &get_stats,
.mtu = (16 * 1024) + 20 + 20 + 12,
@ -227,10 +227,12 @@ struct net_device loopback_dev = {
.nd_net = &init_net,
};
struct net_device *loopback_dev = &__loopback_dev;
/* Setup and register the loopback device. */
static int __init loopback_init(void)
{
int err = register_netdev(&loopback_dev);
int err = register_netdev(loopback_dev);
if (err)
panic("loopback: Failed to register netdevice: %d\n", err);

2
include/linux/netdevice.h
View File

@ -741,7 +741,7 @@ struct packet_type {
#include <linux/interrupt.h>
#include <linux/notifier.h>
extern struct net_device loopback_dev; /* The loopback */
extern struct net_device *loopback_dev; /* The loopback */
extern rwlock_t dev_base_lock; /* Device list lock */

8
net/core/dst.c
View File

@ -278,13 +278,13 @@ static inline void dst_ifdown(struct dst_entry *dst, struct net_device *dev,
if (!unregister) {
dst->input = dst->output = dst_discard;
} else {
dst->dev = &loopback_dev;
dev_hold(&loopback_dev);
dst->dev = loopback_dev;
dev_hold(dst->dev);
dev_put(dev);
if (dst->neighbour && dst->neighbour->dev == dev) {
dst->neighbour->dev = &loopback_dev;
dst->neighbour->dev = loopback_dev;
dev_put(dev);
dev_hold(&loopback_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);
read_unlock(&dev_base_lock);
dev_put(dev);
if (rv == 0 || dev == &loopback_dev)
if (rv == 0 || dev == loopback_dev)
return rv;
}
dev = &loopback_dev;
dev = loopback_dev;
dev_hold(dev);
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,
} },
.mark = oldflp->mark,
.iif = loopback_dev.ifindex,
.iif = loopback_dev->ifindex,
.oif = oldflp->oif };
struct dn_route *rt = NULL;
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"
" iif=%d oif=%d\n", dn_ntohs(oldflp->fld_dst),
dn_ntohs(oldflp->fld_src),
oldflp->mark, loopback_dev.ifindex, oldflp->oif);
oldflp->mark, loopback_dev->ifindex, oldflp->oif);
/* If we have an output interface, verify its a DECnet device */
if (oldflp->oif) {
@ -957,7 +957,7 @@ source_ok:
err = -EADDRNOTAVAIL;
if (dev_out)
dev_put(dev_out);
dev_out = &loopback_dev;
dev_out = loopback_dev;
dev_hold(dev_out);
if (!fl.fld_dst) {
fl.fld_dst =
@ -966,7 +966,7 @@ source_ok:
if (!fl.fld_dst)
goto out;
}
fl.oif = loopback_dev.ifindex;
fl.oif = loopback_dev->ifindex;
res.type = RTN_LOCAL;
goto make_route;
}
@ -1012,7 +1012,7 @@ source_ok:
if (dev_out)
dev_put(dev_out);
if (dn_dev_islocal(neigh->dev, fl.fld_dst)) {
dev_out = &loopback_dev;
dev_out = loopback_dev;
res.type = RTN_LOCAL;
} else {
dev_out = neigh->dev;
@ -1033,7 +1033,7 @@ source_ok:
/* Possible improvement - check all devices for local addr */
if (dn_dev_islocal(dev_out, fl.fld_dst)) {
dev_put(dev_out);
dev_out = &loopback_dev;
dev_out = loopback_dev;
dev_hold(dev_out);
res.type = RTN_LOCAL;
goto select_source;
@ -1069,7 +1069,7 @@ select_source:
fl.fld_src = fl.fld_dst;
if (dev_out)
dev_put(dev_out);
dev_out = &loopback_dev;
dev_out = loopback_dev;
dev_hold(dev_out);
fl.oif = dev_out->ifindex;
if (res.fi)

6
net/ipv4/devinet.c
View File

@ -203,7 +203,7 @@ static void inetdev_destroy(struct in_device *in_dev)
ASSERT_RTNL();
dev = in_dev->dev;
if (dev == &loopback_dev)
if (dev == loopback_dev)
return;
in_dev->dead = 1;
@ -1061,7 +1061,7 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
in_dev = inetdev_init(dev);
if (!in_dev)
return notifier_from_errno(-ENOMEM);
if (dev == &loopback_dev) {
if (dev == loopback_dev) {
IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
}
@ -1077,7 +1077,7 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
case NETDEV_UP:
if (dev->mtu < 68)
break;
if (dev == &loopback_dev) {
if (dev == loopback_dev) {
struct in_ifaddr *ifa;
if ((ifa = inet_alloc_ifa()) != NULL) {
ifa->ifa_local =

6
net/ipv4/ipconfig.c
View File

@ -190,11 +190,11 @@ static int __init ic_open_devs(void)
rtnl_lock();
/* bring loopback device up first */
if (dev_change_flags(&loopback_dev, loopback_dev.flags | IFF_UP) < 0)
printk(KERN_ERR "IP-Config: Failed to open %s\n", loopback_dev.name);
if (dev_change_flags(loopback_dev, loopback_dev->flags | IFF_UP) < 0)
printk(KERN_ERR "IP-Config: Failed to open %s\n", loopback_dev->name);
for_each_netdev(&init_net, dev) {
if (dev == &loopback_dev)
if (dev == loopback_dev)
continue;
if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
(!(dev->flags & IFF_LOOPBACK) &&

2
net/ipv4/ipvs/ip_vs_core.c
View File

@ -961,7 +961,7 @@ ip_vs_in(unsigned int hooknum, struct sk_buff **pskb,
* ... don't know why 1st test DOES NOT include 2nd (?)
*/
if (unlikely(skb->pkt_type != PACKET_HOST
|| skb->dev == &loopback_dev || skb->sk)) {
|| skb->dev == loopback_dev || skb->sk)) {
IP_VS_DBG(12, "packet type=%d proto=%d daddr=%d.%d.%d.%d ignored\n",
skb->pkt_type,
ip_hdr(skb)->protocol,

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 in_device *idev = rt->idev;
if (dev != &loopback_dev && idev && idev->dev == dev) {
struct in_device *loopback_idev = in_dev_get(&loopback_dev);
if (dev != loopback_dev && idev && idev->dev == dev) {
struct in_device *loopback_idev = in_dev_get(loopback_dev);
if (loopback_idev) {
rt->idev = loopback_idev;
in_dev_put(idev);
@ -1555,7 +1555,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
#endif
rth->rt_iif =
rth->fl.iif = dev->ifindex;
rth->u.dst.dev = &loopback_dev;
rth->u.dst.dev = loopback_dev;
dev_hold(rth->u.dst.dev);
rth->idev = in_dev_get(rth->u.dst.dev);
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) {
int result;
result = fib_validate_source(saddr, daddr, tos,
loopback_dev.ifindex,
loopback_dev->ifindex,
dev, &spec_dst, &itag);
if (result < 0)
goto martian_source;
@ -1879,7 +1879,7 @@ local_input:
#endif
rth->rt_iif =
rth->fl.iif = dev->ifindex;
rth->u.dst.dev = &loopback_dev;
rth->u.dst.dev = loopback_dev;
dev_hold(rth->u.dst.dev);
rth->idev = in_dev_get(rth->u.dst.dev);
rth->rt_gateway = daddr;
@ -2149,7 +2149,7 @@ static int ip_route_output_slow(struct rtable **rp, const struct flowi *oldflp)
RT_SCOPE_UNIVERSE),
} },
.mark = oldflp->mark,
.iif = loopback_dev.ifindex,
.iif = loopback_dev->ifindex,
.oif = oldflp->oif };
struct fib_result res;
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);
if (dev_out)
dev_put(dev_out);
dev_out = &loopback_dev;
dev_out = loopback_dev;
dev_hold(dev_out);
fl.oif = loopback_dev.ifindex;
fl.oif = loopback_dev->ifindex;
res.type = RTN_LOCAL;
flags |= RTCF_LOCAL;
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;
if (dev_out)
dev_put(dev_out);
dev_out = &loopback_dev;
dev_out = loopback_dev;
dev_hold(dev_out);
fl.oif = dev_out->ifindex;
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;
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(loopback_dev);
BUG_ON(!loopback_idev);
do {

15
net/ipv6/addrconf.c
View File

@ -2410,7 +2410,7 @@ static int addrconf_ifdown(struct net_device *dev, int how)
ASSERT_RTNL();
if (dev == &loopback_dev && how == 1)
if (dev == loopback_dev && how == 1)
how = 0;
rt6_ifdown(dev);
@ -4212,16 +4212,19 @@ int __init addrconf_init(void)
* device and it being up should be removed.
*/
rtnl_lock();
if (!ipv6_add_dev(&loopback_dev))
if (!ipv6_add_dev(loopback_dev))
err = -ENOMEM;
rtnl_unlock();
if (err)
return err;
ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
ip6_null_entry.u.dst.dev = loopback_dev;
ip6_null_entry.rt6i_idev = in6_dev_get(loopback_dev);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
ip6_prohibit_entry.rt6i_idev = in6_dev_get(&loopback_dev);
ip6_blk_hole_entry.rt6i_idev = in6_dev_get(&loopback_dev);
ip6_prohibit_entry.u.dst.dev = loopback_dev;
ip6_prohibit_entry.rt6i_idev = in6_dev_get(loopback_dev);
ip6_blk_hole_entry.u.dst.dev = loopback_dev;
ip6_blk_hole_entry.rt6i_idev = in6_dev_get(loopback_dev);
#endif
register_netdevice_notifier(&ipv6_dev_notf);
@ -4276,7 +4279,7 @@ void __exit addrconf_cleanup(void)
continue;
addrconf_ifdown(dev, 1);
}
addrconf_ifdown(&loopback_dev, 2);
addrconf_ifdown(loopback_dev, 2);
/*
* Check hash table.

2
net/ipv6/ip6_input.c
View File

@ -91,7 +91,7 @@ int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt
*
* BTW, when we send a packet for our own local address on a
* non-loopback interface (e.g. ethX), it is being delivered
* via the loopback interface (lo) here; skb->dev = &loopback_dev.
* via the loopback interface (lo) here; skb->dev = loopback_dev.
* It, however, should be considered as if it is being
* arrived via the sending interface (ethX), because of the
* nature of scoping architecture. --yoshfuji

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)
{
if (hooknum == NF_IP6_LOCAL_OUT && skb_in->dev == NULL)
skb_in->dev = &loopback_dev;
skb_in->dev = loopback_dev;
icmpv6_send(skb_in, ICMPV6_DEST_UNREACH, code, 0, NULL);
}

15
net/ipv6/route.c
View File

@ -138,7 +138,6 @@ struct rt6_info ip6_null_entry = {
.dst = {
.__refcnt = ATOMIC_INIT(1),
.__use = 1,
.dev = &loopback_dev,
.obsolete = -1,
.error = -ENETUNREACH,
.metrics = { [RTAX_HOPLIMIT - 1] = 255, },
@ -164,7 +163,6 @@ struct rt6_info ip6_prohibit_entry = {
.dst = {
.__refcnt = ATOMIC_INIT(1),
.__use = 1,
.dev = &loopback_dev,
.obsolete = -1,
.error = -EACCES,
.metrics = { [RTAX_HOPLIMIT - 1] = 255, },
@ -184,7 +182,6 @@ struct rt6_info ip6_blk_hole_entry = {
.dst = {
.__refcnt = ATOMIC_INIT(1),
.__use = 1,
.dev = &loopback_dev,
.obsolete = -1,
.error = -EINVAL,
.metrics = { [RTAX_HOPLIMIT - 1] = 255, },
@ -224,8 +221,8 @@ static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
struct rt6_info *rt = (struct rt6_info *)dst;
struct inet6_dev *idev = rt->rt6i_idev;
if (dev != &loopback_dev && idev != NULL && idev->dev == dev) {
struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
if (dev != loopback_dev && idev != NULL && idev->dev == dev) {
struct inet6_dev *loopback_idev = in6_dev_get(loopback_dev);
if (loopback_idev != NULL) {
rt->rt6i_idev = loopback_idev;
in6_dev_put(idev);
@ -1188,12 +1185,12 @@ int ip6_route_add(struct fib6_config *cfg)
if ((cfg->fc_flags & RTF_REJECT) ||
(dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
/* hold loopback dev/idev if we haven't done so. */
if (dev != &loopback_dev) {
if (dev != loopback_dev) {
if (dev) {
dev_put(dev);
in6_dev_put(idev);
}
dev = &loopback_dev;
dev = loopback_dev;
dev_hold(dev);
idev = in6_dev_get(dev);
if (!idev) {
@ -1897,13 +1894,13 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
if (rt == NULL)
return ERR_PTR(-ENOMEM);
dev_hold(&loopback_dev);
dev_hold(loopback_dev);
in6_dev_hold(idev);
rt->u.dst.flags = DST_HOST;
rt->u.dst.input = ip6_input;
rt->u.dst.output = ip6_output;
rt->rt6i_dev = &loopback_dev;
rt->rt6i_dev = loopback_dev;
rt->rt6i_idev = idev;
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));

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;
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(loopback_dev);
BUG_ON(!loopback_idev);
do {

4
net/xfrm/xfrm_policy.c
View File

@ -1949,8 +1949,8 @@ static int stale_bundle(struct dst_entry *dst)
void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
{
while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
dst->dev = &loopback_dev;
dev_hold(&loopback_dev);
dst->dev = loopback_dev;
dev_hold(dst->dev);
dev_put(dev);
}
}