提交 de3cb747 编写于 作者: D Daniel Lezcano 提交者: David S. Miller

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

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: NEric W. Biederman <ebiederm@xmission.com>
Signed-off-by: NDaniel Lezcano <dlezcano@fr.ibm.com>
Acked-By: NKirill Korotaev <dev@sw.ru>
Acked-by: NBenjamin Thery <benjamin.thery@bull.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 55682965
......@@ -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);
......
......@@ -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 */
......
......@@ -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);
}
}
}
......
......@@ -869,10 +869,10 @@ int dn_dev_bind_default(__le16 *addr)
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;
}
......
......@@ -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 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *old
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 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *old
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 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *old
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 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *old
/* 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 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *old
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)
......
......@@ -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 =
......
......@@ -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) &&
......
......@@ -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,
......
......@@ -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 @@ out: return err;
#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)
......
......@@ -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 {
......
......@@ -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.
......
......@@ -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
......
......@@ -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);
}
......
......@@ -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));
......
......@@ -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 {
......
......@@ -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);
}
}
......
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