X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=net%2Fipv6%2Fip6_tunnel.c;h=8f39893d808153993dcecf2326dd453dd2b630b9;hb=d19d56ddc88e7895429ef118db9c83c7bbe3ce6a;hp=37814810ac4943fdaf698315592457de84355c3e;hpb=3dca02af38c11a970160387ab36ae6043feb03cd;p=safe%2Fjmp%2Flinux-2.6 diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c index 3781481..8f39893 100644 --- a/net/ipv6/ip6_tunnel.c +++ b/net/ipv6/ip6_tunnel.c @@ -6,8 +6,6 @@ * Ville Nuorvala * Yasuyuki Kozakai * - * $Id$ - * * Based on: * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c * @@ -39,6 +37,7 @@ #include #include #include +#include #include #include @@ -76,11 +75,10 @@ MODULE_LICENSE("GPL"); (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \ (HASH_SIZE - 1)) -static int ip6_fb_tnl_dev_init(struct net_device *dev); -static int ip6_tnl_dev_init(struct net_device *dev); +static void ip6_tnl_dev_init(struct net_device *dev); static void ip6_tnl_dev_setup(struct net_device *dev); -static int ip6_tnl_net_id; +static int ip6_tnl_net_id __read_mostly; struct ip6_tnl_net { /* the IPv6 tunnel fallback device */ struct net_device *fb_tnl_dev; @@ -90,8 +88,10 @@ struct ip6_tnl_net { struct ip6_tnl **tnls[2]; }; -/* lock for the tunnel lists */ -static DEFINE_RWLOCK(ip6_tnl_lock); +/* + * Locking : hash tables are protected by RCU and a spinlock + */ +static DEFINE_SPINLOCK(ip6_tnl_lock); static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) { @@ -132,6 +132,9 @@ static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) * else %NULL **/ +#define for_each_ip6_tunnel_rcu(start) \ + for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) + static struct ip6_tnl * ip6_tnl_lookup(struct net *net, struct in6_addr *remote, struct in6_addr *local) { @@ -140,13 +143,14 @@ ip6_tnl_lookup(struct net *net, struct in6_addr *remote, struct in6_addr *local) struct ip6_tnl *t; struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); - for (t = ip6n->tnls_r_l[h0 ^ h1]; t; t = t->next) { + for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[h0 ^ h1]) { if (ipv6_addr_equal(local, &t->parms.laddr) && ipv6_addr_equal(remote, &t->parms.raddr) && (t->dev->flags & IFF_UP)) return t; } - if ((t = ip6n->tnls_wc[0]) != NULL && (t->dev->flags & IFF_UP)) + t = rcu_dereference(ip6n->tnls_wc[0]); + if (t && (t->dev->flags & IFF_UP)) return t; return NULL; @@ -188,10 +192,10 @@ ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) { struct ip6_tnl **tp = ip6_tnl_bucket(ip6n, &t->parms); + spin_lock_bh(&ip6_tnl_lock); t->next = *tp; - write_lock_bh(&ip6_tnl_lock); - *tp = t; - write_unlock_bh(&ip6_tnl_lock); + rcu_assign_pointer(*tp, t); + spin_unlock_bh(&ip6_tnl_lock); } /** @@ -206,9 +210,9 @@ ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) for (tp = ip6_tnl_bucket(ip6n, &t->parms); *tp; tp = &(*tp)->next) { if (t == *tp) { - write_lock_bh(&ip6_tnl_lock); + spin_lock_bh(&ip6_tnl_lock); *tp = t->next; - write_unlock_bh(&ip6_tnl_lock); + spin_unlock_bh(&ip6_tnl_lock); break; } } @@ -251,8 +255,8 @@ static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p) } t = netdev_priv(dev); - dev->init = ip6_tnl_dev_init; t->parms = *p; + ip6_tnl_dev_init(dev); if ((err = register_netdevice(dev)) < 0) goto failed_free; @@ -315,9 +319,9 @@ ip6_tnl_dev_uninit(struct net_device *dev) struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); if (dev == ip6n->fb_tnl_dev) { - write_lock_bh(&ip6_tnl_lock); + spin_lock_bh(&ip6_tnl_lock); ip6n->tnls_wc[0] = NULL; - write_unlock_bh(&ip6_tnl_lock); + spin_unlock_bh(&ip6_tnl_lock); } else { ip6_tnl_unlink(ip6n, t); } @@ -396,13 +400,13 @@ parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw) static int ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, - int *type, int *code, int *msg, __u32 *info, int offset) + u8 *type, u8 *code, int *msg, __u32 *info, int offset) { struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data; struct ip6_tnl *t; int rel_msg = 0; - int rel_type = ICMPV6_DEST_UNREACH; - int rel_code = ICMPV6_ADDR_UNREACH; + u8 rel_type = ICMPV6_DEST_UNREACH; + u8 rel_code = ICMPV6_ADDR_UNREACH; __u32 rel_info = 0; __u16 len; int err = -ENOENT; @@ -411,7 +415,7 @@ ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, in trouble since we might need the source address for further processing of the error. */ - read_lock(&ip6_tnl_lock); + rcu_read_lock(); if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr)) == NULL) goto out; @@ -484,17 +488,17 @@ ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, *msg = rel_msg; out: - read_unlock(&ip6_tnl_lock); + rcu_read_unlock(); return err; } static int ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, - int type, int code, int offset, __be32 info) + u8 type, u8 code, int offset, __be32 info) { int rel_msg = 0; - int rel_type = type; - int rel_code = code; + u8 rel_type = type; + u8 rel_code = code; __u32 rel_info = ntohl(info); int err; struct sk_buff *skb2; @@ -534,8 +538,8 @@ ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, if (!skb2) return 0; - dst_release(skb2->dst); - skb2->dst = NULL; + skb_dst_drop(skb2); + skb_pull(skb2, offset); skb_reset_network_header(skb2); eiph = ip_hdr(skb2); @@ -562,21 +566,21 @@ ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, ip_rt_put(rt); goto out; } - skb2->dst = (struct dst_entry *)rt; + skb_dst_set(skb2, (struct dst_entry *)rt); } else { ip_rt_put(rt); if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, skb2->dev) || - skb2->dst->dev->type != ARPHRD_TUNNEL) + skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) goto out; } /* change mtu on this route */ if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { - if (rel_info > dst_mtu(skb2->dst)) + if (rel_info > dst_mtu(skb_dst(skb2))) goto out; - skb2->dst->ops->update_pmtu(skb2->dst, rel_info); + skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info); } icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); @@ -588,11 +592,11 @@ out: static int ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, - int type, int code, int offset, __be32 info) + u8 type, u8 code, int offset, __be32 info) { int rel_msg = 0; - int rel_type = type; - int rel_code = code; + u8 rel_type = type; + u8 rel_code = code; __u32 rel_info = ntohl(info); int err; @@ -608,8 +612,7 @@ ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, if (!skb2) return 0; - dst_release(skb2->dst); - skb2->dst = NULL; + skb_dst_drop(skb2); skb_pull(skb2, offset); skb_reset_network_header(skb2); @@ -620,7 +623,7 @@ ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, if (rt && rt->rt6i_dev) skb2->dev = rt->rt6i_dev; - icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev); + icmpv6_send(skb2, rel_type, rel_code, rel_info); if (rt) dst_release(&rt->u.dst); @@ -655,6 +658,7 @@ static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, IP6_ECN_set_ce(ipv6_hdr(skb)); } +/* called with rcu_read_lock() */ static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) { struct ip6_tnl_parm *p = &t->parms; @@ -665,15 +669,13 @@ static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) struct net_device *ldev = NULL; if (p->link) - ldev = dev_get_by_index(net, p->link); + ldev = dev_get_by_index_rcu(net, p->link); if ((ipv6_addr_is_multicast(&p->laddr) || likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) && likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0))) ret = 1; - if (ldev) - dev_put(ldev); } return ret; } @@ -696,23 +698,23 @@ static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, struct ip6_tnl *t; struct ipv6hdr *ipv6h = ipv6_hdr(skb); - read_lock(&ip6_tnl_lock); + rcu_read_lock(); if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr)) != NULL) { if (t->parms.proto != ipproto && t->parms.proto != 0) { - read_unlock(&ip6_tnl_lock); + rcu_read_unlock(); goto discard; } if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { - read_unlock(&ip6_tnl_lock); + rcu_read_unlock(); goto discard; } if (!ip6_tnl_rcv_ctl(t)) { t->dev->stats.rx_dropped++; - read_unlock(&ip6_tnl_lock); + rcu_read_unlock(); goto discard; } secpath_reset(skb); @@ -721,20 +723,15 @@ static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, skb->protocol = htons(protocol); skb->pkt_type = PACKET_HOST; memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); - skb->dev = t->dev; - dst_release(skb->dst); - skb->dst = NULL; - nf_reset(skb); - dscp_ecn_decapsulate(t, ipv6h, skb); + skb_tunnel_rx(skb, t->dev); - t->dev->stats.rx_packets++; - t->dev->stats.rx_bytes += skb->len; + dscp_ecn_decapsulate(t, ipv6h, skb); netif_rx(skb); - read_unlock(&ip6_tnl_lock); + rcu_read_unlock(); return 0; } - read_unlock(&ip6_tnl_lock); + rcu_read_unlock(); return 1; discard: @@ -802,8 +799,9 @@ static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) if (p->flags & IP6_TNL_F_CAP_XMIT) { struct net_device *ldev = NULL; + rcu_read_lock(); if (p->link) - ldev = dev_get_by_index(net, p->link); + ldev = dev_get_by_index_rcu(net, p->link); if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) printk(KERN_WARNING @@ -817,8 +815,7 @@ static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) p->name); else ret = 1; - if (ldev) - dev_put(ldev); + rcu_read_unlock(); } return ret; } @@ -848,6 +845,7 @@ static int ip6_tnl_xmit2(struct sk_buff *skb, int encap_limit, __u32 *pmtu) { + struct net *net = dev_net(dev); struct ip6_tnl *t = netdev_priv(dev); struct net_device_stats *stats = &t->dev->stats; struct ipv6hdr *ipv6h = ipv6_hdr(skb); @@ -863,9 +861,9 @@ static int ip6_tnl_xmit2(struct sk_buff *skb, if ((dst = ip6_tnl_dst_check(t)) != NULL) dst_hold(dst); else { - dst = ip6_route_output(dev_net(dev), NULL, fl); + dst = ip6_route_output(net, NULL, fl); - if (dst->error || xfrm_lookup(&dst, fl, NULL, 0) < 0) + if (dst->error || xfrm_lookup(net, &dst, fl, NULL, 0) < 0) goto tx_err_link_failure; } @@ -886,8 +884,8 @@ static int ip6_tnl_xmit2(struct sk_buff *skb, } if (mtu < IPV6_MIN_MTU) mtu = IPV6_MIN_MTU; - if (skb->dst) - skb->dst->ops->update_pmtu(skb->dst, mtu); + if (skb_dst(skb)) + skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); if (skb->len > mtu) { *pmtu = mtu; err = -EMSGSIZE; @@ -911,8 +909,8 @@ static int ip6_tnl_xmit2(struct sk_buff *skb, kfree_skb(skb); skb = new_skb; } - dst_release(skb->dst); - skb->dst = dst_clone(dst); + skb_dst_drop(skb); + skb_dst_set(skb, dst_clone(dst)); skb->transport_header = skb->network_header; @@ -1013,7 +1011,7 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; if (tel->encap_limit == 0) { icmpv6_send(skb, ICMPV6_PARAMPROB, - ICMPV6_HDR_FIELD, offset + 2, skb->dev); + ICMPV6_HDR_FIELD, offset + 2); return -1; } encap_limit = tel->encap_limit - 1; @@ -1032,30 +1030,25 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); if (err != 0) { if (err == -EMSGSIZE) - icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); + icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); return -1; } return 0; } -static int +static netdev_tx_t ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) { struct ip6_tnl *t = netdev_priv(dev); struct net_device_stats *stats = &t->dev->stats; int ret; - if (t->recursion++) { - stats->collisions++; - goto tx_err; - } - switch (skb->protocol) { - case __constant_htons(ETH_P_IP): + case htons(ETH_P_IP): ret = ip4ip6_tnl_xmit(skb, dev); break; - case __constant_htons(ETH_P_IPV6): + case htons(ETH_P_IPV6): ret = ip6ip6_tnl_xmit(skb, dev); break; default: @@ -1065,15 +1058,13 @@ ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) if (ret < 0) goto tx_err; - t->recursion--; - return 0; + return NETDEV_TX_OK; tx_err: stats->tx_errors++; stats->tx_dropped++; kfree_skb(skb); - t->recursion--; - return 0; + return NETDEV_TX_OK; } static void ip6_tnl_set_cap(struct ip6_tnl *t) @@ -1101,8 +1092,8 @@ static void ip6_tnl_link_config(struct ip6_tnl *t) struct ip6_tnl_parm *p = &t->parms; struct flowi *fl = &t->fl; - memcpy(&dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); - memcpy(&dev->broadcast, &p->raddr, sizeof(struct in6_addr)); + memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); + memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); /* Set up flowi template */ ipv6_addr_copy(&fl->fl6_src, &p->laddr); @@ -1152,7 +1143,6 @@ static void ip6_tnl_link_config(struct ip6_tnl *t) * ip6_tnl_change - update the tunnel parameters * @t: tunnel to be changed * @p: tunnel configuration parameters - * @active: != 0 if tunnel is ready for use * * Description: * ip6_tnl_change() updates the tunnel parameters @@ -1308,6 +1298,14 @@ ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) return 0; } + +static const struct net_device_ops ip6_tnl_netdev_ops = { + .ndo_uninit = ip6_tnl_dev_uninit, + .ndo_start_xmit = ip6_tnl_xmit, + .ndo_do_ioctl = ip6_tnl_ioctl, + .ndo_change_mtu = ip6_tnl_change_mtu, +}; + /** * ip6_tnl_dev_setup - setup virtual tunnel device * @dev: virtual device associated with tunnel @@ -1318,11 +1316,8 @@ ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) static void ip6_tnl_dev_setup(struct net_device *dev) { - dev->uninit = ip6_tnl_dev_uninit; + dev->netdev_ops = &ip6_tnl_netdev_ops; dev->destructor = free_netdev; - dev->hard_start_xmit = ip6_tnl_xmit; - dev->do_ioctl = ip6_tnl_ioctl; - dev->change_mtu = ip6_tnl_change_mtu; dev->type = ARPHRD_TUNNEL6; dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); @@ -1351,13 +1346,11 @@ ip6_tnl_dev_init_gen(struct net_device *dev) * @dev: virtual device associated with tunnel **/ -static int -ip6_tnl_dev_init(struct net_device *dev) +static void ip6_tnl_dev_init(struct net_device *dev) { struct ip6_tnl *t = netdev_priv(dev); ip6_tnl_dev_init_gen(dev); ip6_tnl_link_config(t); - return 0; } /** @@ -1367,8 +1360,7 @@ ip6_tnl_dev_init(struct net_device *dev) * Return: 0 **/ -static int -ip6_fb_tnl_dev_init(struct net_device *dev) +static void __net_init ip6_fb_tnl_dev_init(struct net_device *dev) { struct ip6_tnl *t = netdev_priv(dev); struct net *net = dev_net(dev); @@ -1378,7 +1370,6 @@ ip6_fb_tnl_dev_init(struct net_device *dev) t->parms.proto = IPPROTO_IPV6; dev_hold(dev); ip6n->tnls_wc[0] = t; - return 0; } static struct xfrm6_tunnel ip4ip6_handler = { @@ -1393,33 +1384,29 @@ static struct xfrm6_tunnel ip6ip6_handler = { .priority = 1, }; -static void ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n) +static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n) { int h; struct ip6_tnl *t; + LIST_HEAD(list); for (h = 0; h < HASH_SIZE; h++) { - while ((t = ip6n->tnls_r_l[h]) != NULL) - unregister_netdevice(t->dev); + t = ip6n->tnls_r_l[h]; + while (t != NULL) { + unregister_netdevice_queue(t->dev, &list); + t = t->next; + } } t = ip6n->tnls_wc[0]; - unregister_netdevice(t->dev); + unregister_netdevice_queue(t->dev, &list); + unregister_netdevice_many(&list); } -static int ip6_tnl_init_net(struct net *net) +static int __net_init ip6_tnl_init_net(struct net *net) { + struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); int err; - struct ip6_tnl_net *ip6n; - - err = -ENOMEM; - ip6n = kzalloc(sizeof(struct ip6_tnl_net), GFP_KERNEL); - if (ip6n == NULL) - goto err_alloc; - - err = net_assign_generic(net, ip6_tnl_net_id, ip6n); - if (err < 0) - goto err_assign; ip6n->tnls[0] = ip6n->tnls_wc; ip6n->tnls[1] = ip6n->tnls_r_l; @@ -1430,10 +1417,10 @@ static int ip6_tnl_init_net(struct net *net) if (!ip6n->fb_tnl_dev) goto err_alloc_dev; - - ip6n->fb_tnl_dev->init = ip6_fb_tnl_dev_init; dev_net_set(ip6n->fb_tnl_dev, net); + ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); + err = register_netdev(ip6n->fb_tnl_dev); if (err < 0) goto err_register; @@ -1442,27 +1429,23 @@ static int ip6_tnl_init_net(struct net *net) err_register: free_netdev(ip6n->fb_tnl_dev); err_alloc_dev: - /* nothing */ -err_assign: - kfree(ip6n); -err_alloc: return err; } -static void ip6_tnl_exit_net(struct net *net) +static void __net_exit ip6_tnl_exit_net(struct net *net) { - struct ip6_tnl_net *ip6n; + struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); - ip6n = net_generic(net, ip6_tnl_net_id); rtnl_lock(); ip6_tnl_destroy_tunnels(ip6n); rtnl_unlock(); - kfree(ip6n); } static struct pernet_operations ip6_tnl_net_ops = { .init = ip6_tnl_init_net, .exit = ip6_tnl_exit_net, + .id = &ip6_tnl_net_id, + .size = sizeof(struct ip6_tnl_net), }; /** @@ -1475,27 +1458,29 @@ static int __init ip6_tunnel_init(void) { int err; - if (xfrm6_tunnel_register(&ip4ip6_handler, AF_INET)) { + err = register_pernet_device(&ip6_tnl_net_ops); + if (err < 0) + goto out_pernet; + + err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); + if (err < 0) { printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n"); - err = -EAGAIN; - goto out; + goto out_ip4ip6; } - if (xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6)) { + err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); + if (err < 0) { printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n"); - err = -EAGAIN; - goto unreg_ip4ip6; + goto out_ip6ip6; } - err = register_pernet_gen_device(&ip6_tnl_net_id, &ip6_tnl_net_ops); - if (err < 0) - goto err_pernet; return 0; -err_pernet: - xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); -unreg_ip4ip6: + +out_ip6ip6: xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); -out: +out_ip4ip6: + unregister_pernet_device(&ip6_tnl_net_ops); +out_pernet: return err; } @@ -1511,7 +1496,7 @@ static void __exit ip6_tunnel_cleanup(void) if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n"); - unregister_pernet_gen_device(ip6_tnl_net_id, &ip6_tnl_net_ops); + unregister_pernet_device(&ip6_tnl_net_ops); } module_init(ip6_tunnel_init);