* Roger Venning <r.venning@telstra.com>: 6to4 support
* Nate Thompson <nate@thebog.net>: 6to4 support
* Fred Templin <fred.l.templin@boeing.com>: isatap support
- * Sascha Hlusiak <mail@saschahlusiak.de>: stateless autoconf for isatap
*/
#include <linux/module.h>
#define HASH_SIZE 16
#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
-static void ipip6_fb_tunnel_init(struct net_device *dev);
static void ipip6_tunnel_init(struct net_device *dev);
static void ipip6_tunnel_setup(struct net_device *dev);
-static int sit_net_id;
+static int sit_net_id __read_mostly;
struct sit_net {
struct ip_tunnel *tunnels_r_l[HASH_SIZE];
struct ip_tunnel *tunnels_r[HASH_SIZE];
struct net_device *fb_tunnel_dev;
};
-static DEFINE_RWLOCK(ipip6_lock);
+/*
+ * Locking : hash tables are protected by RCU and a spinlock
+ */
+static DEFINE_SPINLOCK(ipip6_lock);
+#define for_each_ip_tunnel_rcu(start) \
+ for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
+
+/*
+ * Must be invoked with rcu_read_lock
+ */
static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net,
struct net_device *dev, __be32 remote, __be32 local)
{
struct ip_tunnel *t;
struct sit_net *sitn = net_generic(net, sit_net_id);
- for (t = sitn->tunnels_r_l[h0^h1]; t; t = t->next) {
+ for_each_ip_tunnel_rcu(sitn->tunnels_r_l[h0 ^ h1]) {
if (local == t->parms.iph.saddr &&
remote == t->parms.iph.daddr &&
(!dev || !t->parms.link || dev->iflink == t->parms.link) &&
(t->dev->flags & IFF_UP))
return t;
}
- for (t = sitn->tunnels_r[h0]; t; t = t->next) {
+ for_each_ip_tunnel_rcu(sitn->tunnels_r[h0]) {
if (remote == t->parms.iph.daddr &&
(!dev || !t->parms.link || dev->iflink == t->parms.link) &&
(t->dev->flags & IFF_UP))
return t;
}
- for (t = sitn->tunnels_l[h1]; t; t = t->next) {
+ for_each_ip_tunnel_rcu(sitn->tunnels_l[h1]) {
if (local == t->parms.iph.saddr &&
(!dev || !t->parms.link || dev->iflink == t->parms.link) &&
(t->dev->flags & IFF_UP))
return t;
}
- t = sitn->tunnels_wc[0];
+ t = rcu_dereference(sitn->tunnels_wc[0]);
if ((t != NULL) && (t->dev->flags & IFF_UP))
return t;
return NULL;
for (tp = ipip6_bucket(sitn, t); *tp; tp = &(*tp)->next) {
if (t == *tp) {
- write_lock_bh(&ipip6_lock);
+ spin_lock_bh(&ipip6_lock);
*tp = t->next;
- write_unlock_bh(&ipip6_lock);
+ spin_unlock_bh(&ipip6_lock);
break;
}
}
{
struct ip_tunnel **tp = ipip6_bucket(sitn, t);
+ spin_lock_bh(&ipip6_lock);
t->next = *tp;
- write_lock_bh(&ipip6_lock);
- *tp = t;
- write_unlock_bh(&ipip6_lock);
+ rcu_assign_pointer(*tp, t);
+ spin_unlock_bh(&ipip6_lock);
+}
+
+static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
+{
+#ifdef CONFIG_IPV6_SIT_6RD
+ struct ip_tunnel *t = netdev_priv(dev);
+
+ if (t->dev == sitn->fb_tunnel_dev) {
+ ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
+ t->ip6rd.relay_prefix = 0;
+ t->ip6rd.prefixlen = 16;
+ t->ip6rd.relay_prefixlen = 0;
+ } else {
+ struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
+ memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
+ }
+#endif
}
static struct ip_tunnel * ipip6_tunnel_locate(struct net *net,
nt->parms = *parms;
ipip6_tunnel_init(dev);
+ ipip6_tunnel_clone_6rd(dev, sitn);
if (parms->i_flags & SIT_ISATAP)
dev->priv_flags |= IFF_ISATAP;
return NULL;
}
-static void ipip6_tunnel_rs_timer(unsigned long data)
-{
- struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *) data;
- struct inet6_dev *ifp;
- struct inet6_ifaddr *addr;
-
- spin_lock(&p->lock);
- ifp = __in6_dev_get(p->tunnel->dev);
-
- read_lock_bh(&ifp->lock);
- for (addr = ifp->addr_list; addr; addr = addr->if_next) {
- struct in6_addr rtr;
+static DEFINE_SPINLOCK(ipip6_prl_lock);
- if (!(ipv6_addr_type(&addr->addr) & IPV6_ADDR_LINKLOCAL))
- continue;
-
- /* Send RS to guessed linklocal address of router
- *
- * Better: send to ff02::2 encapsuled in unicast directly
- * to router-v4 instead of guessing the v6 address.
- *
- * Cisco/Windows seem to not set the u/l bit correctly,
- * so we won't guess right.
- */
- ipv6_addr_set(&rtr, htonl(0xFE800000), 0, 0, 0);
- if (!__ipv6_isatap_ifid(rtr.s6_addr + 8,
- p->addr)) {
- ndisc_send_rs(p->tunnel->dev, &addr->addr, &rtr);
- }
- }
- read_unlock_bh(&ifp->lock);
-
- mod_timer(&p->rs_timer, jiffies + HZ * p->rs_delay);
- spin_unlock(&p->lock);
-
- return;
-}
+#define for_each_prl_rcu(start) \
+ for (prl = rcu_dereference(start); \
+ prl; \
+ prl = rcu_dereference(prl->next))
static struct ip_tunnel_prl_entry *
__ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
{
- struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *)NULL;
+ struct ip_tunnel_prl_entry *prl;
- for (p = t->prl; p; p = p->next)
- if (p->addr == addr)
+ for_each_prl_rcu(t->prl)
+ if (prl->addr == addr)
break;
- return p;
+ return prl;
}
kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
NULL;
- read_lock(&ipip6_lock);
+ rcu_read_lock();
ca = t->prl_count < cmax ? t->prl_count : cmax;
}
c = 0;
- for (prl = t->prl; prl; prl = prl->next) {
- if (c > cmax)
+ for_each_prl_rcu(t->prl) {
+ if (c >= cmax)
break;
if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
continue;
kp[c].addr = prl->addr;
kp[c].flags = prl->flags;
- kp[c].rs_delay = prl->rs_delay;
c++;
if (kprl.addr != htonl(INADDR_ANY))
break;
}
out:
- read_unlock(&ipip6_lock);
+ rcu_read_unlock();
len = sizeof(*kp) * c;
ret = 0;
if (a->addr == htonl(INADDR_ANY))
return -EINVAL;
- write_lock(&ipip6_lock);
+ spin_lock(&ipip6_prl_lock);
for (p = t->prl; p; p = p->next) {
if (p->addr == a->addr) {
- if (chg)
- goto update;
+ if (chg) {
+ p->flags = a->flags;
+ goto out;
+ }
err = -EEXIST;
goto out;
}
}
p->next = t->prl;
- p->tunnel = t;
- t->prl = p;
- t->prl_count++;
-
- spin_lock_init(&p->lock);
- setup_timer(&p->rs_timer, ipip6_tunnel_rs_timer, (unsigned long) p);
-update:
p->addr = a->addr;
p->flags = a->flags;
- p->rs_delay = a->rs_delay;
- if (p->rs_delay == 0)
- p->rs_delay = IPTUNNEL_RS_DEFAULT_DELAY;
- spin_lock(&p->lock);
- del_timer(&p->rs_timer);
- if (p->flags & PRL_DEFAULT)
- mod_timer(&p->rs_timer, jiffies + 1);
- spin_unlock(&p->lock);
+ t->prl_count++;
+ rcu_assign_pointer(t->prl, p);
out:
- write_unlock(&ipip6_lock);
+ spin_unlock(&ipip6_prl_lock);
return err;
}
+static void prl_entry_destroy_rcu(struct rcu_head *head)
+{
+ kfree(container_of(head, struct ip_tunnel_prl_entry, rcu_head));
+}
+
+static void prl_list_destroy_rcu(struct rcu_head *head)
+{
+ struct ip_tunnel_prl_entry *p, *n;
+
+ p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
+ do {
+ n = p->next;
+ kfree(p);
+ p = n;
+ } while (p);
+}
+
static int
ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
{
struct ip_tunnel_prl_entry *x, **p;
int err = 0;
- write_lock(&ipip6_lock);
+ spin_lock(&ipip6_prl_lock);
if (a && a->addr != htonl(INADDR_ANY)) {
for (p = &t->prl; *p; p = &(*p)->next) {
if ((*p)->addr == a->addr) {
x = *p;
*p = x->next;
- spin_lock(&x->lock);
- del_timer(&x->rs_timer);
- spin_unlock(&x->lock);
- kfree(x);
+ call_rcu(&x->rcu_head, prl_entry_destroy_rcu);
t->prl_count--;
goto out;
}
}
err = -ENXIO;
} else {
- while (t->prl) {
+ if (t->prl) {
+ t->prl_count = 0;
x = t->prl;
- t->prl = t->prl->next;
- spin_lock(&x->lock);
- del_timer(&x->rs_timer);
- spin_unlock(&x->lock);
- kfree(x);
- t->prl_count--;
+ call_rcu(&x->rcu_head, prl_list_destroy_rcu);
+ t->prl = NULL;
}
}
out:
- write_unlock(&ipip6_lock);
+ spin_unlock(&ipip6_prl_lock);
return err;
}
struct ip_tunnel_prl_entry *p;
int ok = 1;
- read_lock(&ipip6_lock);
+ rcu_read_lock();
p = __ipip6_tunnel_locate_prl(t, iph->saddr);
if (p) {
if (p->flags & PRL_DEFAULT)
else
ok = 0;
}
- read_unlock(&ipip6_lock);
+ rcu_read_unlock();
return ok;
}
struct sit_net *sitn = net_generic(net, sit_net_id);
if (dev == sitn->fb_tunnel_dev) {
- write_lock_bh(&ipip6_lock);
+ spin_lock_bh(&ipip6_lock);
sitn->tunnels_wc[0] = NULL;
- write_unlock_bh(&ipip6_lock);
+ spin_unlock_bh(&ipip6_lock);
dev_put(dev);
} else {
ipip6_tunnel_unlink(sitn, netdev_priv(dev));
err = -ENOENT;
- read_lock(&ipip6_lock);
+ rcu_read_lock();
t = ipip6_tunnel_lookup(dev_net(skb->dev),
skb->dev,
iph->daddr,
t->err_count = 1;
t->err_time = jiffies;
out:
- read_unlock(&ipip6_lock);
+ rcu_read_unlock();
return err;
}
iph = ip_hdr(skb);
- read_lock(&ipip6_lock);
+ rcu_read_lock();
tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
iph->saddr, iph->daddr);
if (tunnel != NULL) {
if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
!isatap_chksrc(skb, iph, tunnel)) {
tunnel->dev->stats.rx_errors++;
- read_unlock(&ipip6_lock);
+ rcu_read_unlock();
kfree_skb(skb);
return 0;
}
nf_reset(skb);
ipip6_ecn_decapsulate(iph, skb);
netif_rx(skb);
- read_unlock(&ipip6_lock);
+ rcu_read_unlock();
return 0;
}
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
- read_unlock(&ipip6_lock);
+ rcu_read_unlock();
out:
kfree_skb(skb);
return 0;
}
-/* Returns the embedded IPv4 address if the IPv6 address
- comes from 6to4 (RFC 3056) addr space */
-
-static inline __be32 try_6to4(struct in6_addr *v6dst)
+/*
+ * Returns the embedded IPv4 address if the IPv6 address
+ * comes from 6rd / 6to4 (RFC 3056) addr space.
+ */
+static inline
+__be32 try_6rd(struct in6_addr *v6dst, struct ip_tunnel *tunnel)
{
__be32 dst = 0;
+#ifdef CONFIG_IPV6_SIT_6RD
+ if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
+ tunnel->ip6rd.prefixlen)) {
+ unsigned pbw0, pbi0;
+ int pbi1;
+ u32 d;
+
+ pbw0 = tunnel->ip6rd.prefixlen >> 5;
+ pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
+
+ d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
+ tunnel->ip6rd.relay_prefixlen;
+
+ pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
+ if (pbi1 > 0)
+ d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
+ (32 - pbi1);
+
+ dst = tunnel->ip6rd.relay_prefix | htonl(d);
+ }
+#else
if (v6dst->s6_addr16[0] == htons(0x2002)) {
/* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
memcpy(&dst, &v6dst->s6_addr16[1], 4);
}
+#endif
return dst;
}
struct net_device *dev)
{
struct ip_tunnel *tunnel = netdev_priv(dev);
- struct net_device_stats *stats = &tunnel->dev->stats;
+ struct net_device_stats *stats = &dev->stats;
+ struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
struct iphdr *tiph = &tunnel->parms.iph;
struct ipv6hdr *iph6 = ipv6_hdr(skb);
u8 tos = tunnel->parms.iph.tos;
+ __be16 df = tiph->frag_off;
struct rtable *rt; /* Route to the other host */
struct net_device *tdev; /* Device to other host */
struct iphdr *iph; /* Our new IP header */
struct in6_addr *addr6;
int addr_type;
- if (tunnel->recursion++) {
- stats->collisions++;
- goto tx_error;
- }
-
if (skb->protocol != htons(ETH_P_IPV6))
goto tx_error;
}
if (!dst)
- dst = try_6to4(&iph6->daddr);
+ dst = try_6rd(&iph6->daddr, tunnel);
if (!dst) {
struct neighbour *neigh = NULL;
goto tx_error;
}
- if (tiph->frag_off)
+ if (df) {
mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr);
- else
- mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
- if (mtu < 68) {
- stats->collisions++;
- ip_rt_put(rt);
- goto tx_error;
- }
- if (mtu < IPV6_MIN_MTU)
- mtu = IPV6_MIN_MTU;
- if (tunnel->parms.iph.daddr && skb_dst(skb))
- skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
+ if (mtu < 68) {
+ stats->collisions++;
+ ip_rt_put(rt);
+ goto tx_error;
+ }
- if (skb->len > mtu) {
- icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
- ip_rt_put(rt);
- goto tx_error;
+ if (mtu < IPV6_MIN_MTU) {
+ mtu = IPV6_MIN_MTU;
+ df = 0;
+ }
+
+ if (tunnel->parms.iph.daddr && skb_dst(skb))
+ skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
+
+ if (skb->len > mtu) {
+ icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
+ ip_rt_put(rt);
+ goto tx_error;
+ }
}
if (tunnel->err_count > 0) {
struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
if (!new_skb) {
ip_rt_put(rt);
- stats->tx_dropped++;
+ txq->tx_dropped++;
dev_kfree_skb(skb);
- tunnel->recursion--;
return NETDEV_TX_OK;
}
if (skb->sk)
iph = ip_hdr(skb);
iph->version = 4;
iph->ihl = sizeof(struct iphdr)>>2;
- if (mtu > IPV6_MIN_MTU)
- iph->frag_off = tiph->frag_off;
- else
- iph->frag_off = 0;
-
+ iph->frag_off = df;
iph->protocol = IPPROTO_IPV6;
iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
iph->daddr = rt->rt_dst;
nf_reset(skb);
IPTUNNEL_XMIT();
- tunnel->recursion--;
return NETDEV_TX_OK;
tx_error_icmp:
tx_error:
stats->tx_errors++;
dev_kfree_skb(skb);
- tunnel->recursion--;
return NETDEV_TX_OK;
}
struct ip_tunnel *t;
struct net *net = dev_net(dev);
struct sit_net *sitn = net_generic(net, sit_net_id);
+#ifdef CONFIG_IPV6_SIT_6RD
+ struct ip_tunnel_6rd ip6rd;
+#endif
switch (cmd) {
case SIOCGETTUNNEL:
+#ifdef CONFIG_IPV6_SIT_6RD
+ case SIOCGET6RD:
+#endif
t = NULL;
if (dev == sitn->fb_tunnel_dev) {
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
}
if (t == NULL)
t = netdev_priv(dev);
- memcpy(&p, &t->parms, sizeof(p));
- if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
- err = -EFAULT;
+
+ err = -EFAULT;
+ if (cmd == SIOCGETTUNNEL) {
+ memcpy(&p, &t->parms, sizeof(p));
+ if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
+ sizeof(p)))
+ goto done;
+#ifdef CONFIG_IPV6_SIT_6RD
+ } else {
+ ipv6_addr_copy(&ip6rd.prefix, &t->ip6rd.prefix);
+ ip6rd.relay_prefix = t->ip6rd.relay_prefix;
+ ip6rd.prefixlen = t->ip6rd.prefixlen;
+ ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
+ if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
+ sizeof(ip6rd)))
+ goto done;
+#endif
+ }
+ err = 0;
break;
case SIOCADDTUNNEL:
netdev_state_change(dev);
break;
+#ifdef CONFIG_IPV6_SIT_6RD
+ case SIOCADD6RD:
+ case SIOCCHG6RD:
+ case SIOCDEL6RD:
+ err = -EPERM;
+ if (!capable(CAP_NET_ADMIN))
+ goto done;
+
+ err = -EFAULT;
+ if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
+ sizeof(ip6rd)))
+ goto done;
+
+ t = netdev_priv(dev);
+
+ if (cmd != SIOCDEL6RD) {
+ struct in6_addr prefix;
+ __be32 relay_prefix;
+
+ err = -EINVAL;
+ if (ip6rd.relay_prefixlen > 32 ||
+ ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64)
+ goto done;
+
+ ipv6_addr_prefix(&prefix, &ip6rd.prefix,
+ ip6rd.prefixlen);
+ if (!ipv6_addr_equal(&prefix, &ip6rd.prefix))
+ goto done;
+ if (ip6rd.relay_prefixlen)
+ relay_prefix = ip6rd.relay_prefix &
+ htonl(0xffffffffUL <<
+ (32 - ip6rd.relay_prefixlen));
+ else
+ relay_prefix = 0;
+ if (relay_prefix != ip6rd.relay_prefix)
+ goto done;
+
+ ipv6_addr_copy(&t->ip6rd.prefix, &prefix);
+ t->ip6rd.relay_prefix = relay_prefix;
+ t->ip6rd.prefixlen = ip6rd.prefixlen;
+ t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen;
+ } else
+ ipip6_tunnel_clone_6rd(dev, sitn);
+
+ err = 0;
+ break;
+#endif
+
default:
err = -EINVAL;
}
ipip6_tunnel_bind_dev(dev);
}
-static void ipip6_fb_tunnel_init(struct net_device *dev)
+static void __net_init ipip6_fb_tunnel_init(struct net_device *dev)
{
struct ip_tunnel *tunnel = netdev_priv(dev);
struct iphdr *iph = &tunnel->parms.iph;
.priority = 1,
};
-static void sit_destroy_tunnels(struct sit_net *sitn)
+static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head)
{
int prio;
for (prio = 1; prio < 4; prio++) {
int h;
for (h = 0; h < HASH_SIZE; h++) {
- struct ip_tunnel *t;
- while ((t = sitn->tunnels[prio][h]) != NULL)
- unregister_netdevice(t->dev);
+ struct ip_tunnel *t = sitn->tunnels[prio][h];
+
+ while (t != NULL) {
+ unregister_netdevice_queue(t->dev, head);
+ t = t->next;
+ }
}
}
}
-static int sit_init_net(struct net *net)
+static int __net_init sit_init_net(struct net *net)
{
+ struct sit_net *sitn = net_generic(net, sit_net_id);
int err;
- struct sit_net *sitn;
-
- err = -ENOMEM;
- sitn = kzalloc(sizeof(struct sit_net), GFP_KERNEL);
- if (sitn == NULL)
- goto err_alloc;
-
- err = net_assign_generic(net, sit_net_id, sitn);
- if (err < 0)
- goto err_assign;
sitn->tunnels[0] = sitn->tunnels_wc;
sitn->tunnels[1] = sitn->tunnels_l;
dev_net_set(sitn->fb_tunnel_dev, net);
ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
+ ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
if ((err = register_netdev(sitn->fb_tunnel_dev)))
goto err_reg_dev;
dev_put(sitn->fb_tunnel_dev);
free_netdev(sitn->fb_tunnel_dev);
err_alloc_dev:
- /* nothing */
-err_assign:
- kfree(sitn);
-err_alloc:
return err;
}
-static void sit_exit_net(struct net *net)
+static void __net_exit sit_exit_net(struct net *net)
{
- struct sit_net *sitn;
+ struct sit_net *sitn = net_generic(net, sit_net_id);
+ LIST_HEAD(list);
- sitn = net_generic(net, sit_net_id);
rtnl_lock();
- sit_destroy_tunnels(sitn);
- unregister_netdevice(sitn->fb_tunnel_dev);
+ sit_destroy_tunnels(sitn, &list);
+ unregister_netdevice_queue(sitn->fb_tunnel_dev, &list);
+ unregister_netdevice_many(&list);
rtnl_unlock();
- kfree(sitn);
}
static struct pernet_operations sit_net_ops = {
.init = sit_init_net,
.exit = sit_exit_net,
+ .id = &sit_net_id,
+ .size = sizeof(struct sit_net),
};
static void __exit sit_cleanup(void)
{
xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
- unregister_pernet_gen_device(sit_net_id, &sit_net_ops);
+ unregister_pernet_device(&sit_net_ops);
+ rcu_barrier(); /* Wait for completion of call_rcu()'s */
}
static int __init sit_init(void)
printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
- if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) {
+ err = register_pernet_device(&sit_net_ops);
+ if (err < 0)
+ return err;
+ err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
+ if (err < 0) {
+ unregister_pernet_device(&sit_net_ops);
printk(KERN_INFO "sit init: Can't add protocol\n");
- return -EAGAIN;
}
-
- err = register_pernet_gen_device(&sit_net_id, &sit_net_ops);
- if (err < 0)
- xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
-
return err;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff