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1333 lines
32 KiB
1333 lines
32 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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* IPv6 virtual tunneling interface |
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* |
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* Copyright (C) 2013 secunet Security Networks AG |
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* |
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* Author: |
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* Steffen Klassert <[email protected]> |
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* |
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* Based on: |
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* net/ipv6/ip6_tunnel.c |
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*/ |
|
|
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#include <linux/module.h> |
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#include <linux/capability.h> |
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#include <linux/errno.h> |
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#include <linux/types.h> |
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#include <linux/sockios.h> |
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#include <linux/icmp.h> |
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#include <linux/if.h> |
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#include <linux/in.h> |
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#include <linux/ip.h> |
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#include <linux/net.h> |
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#include <linux/in6.h> |
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#include <linux/netdevice.h> |
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#include <linux/if_arp.h> |
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#include <linux/icmpv6.h> |
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#include <linux/init.h> |
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#include <linux/route.h> |
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#include <linux/rtnetlink.h> |
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#include <linux/netfilter_ipv6.h> |
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#include <linux/slab.h> |
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#include <linux/hash.h> |
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|
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#include <linux/uaccess.h> |
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#include <linux/atomic.h> |
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|
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#include <net/icmp.h> |
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#include <net/ip.h> |
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#include <net/ip_tunnels.h> |
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#include <net/ipv6.h> |
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#include <net/ip6_route.h> |
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#include <net/addrconf.h> |
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#include <net/ip6_tunnel.h> |
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#include <net/xfrm.h> |
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#include <net/net_namespace.h> |
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#include <net/netns/generic.h> |
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#include <linux/etherdevice.h> |
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|
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#define IP6_VTI_HASH_SIZE_SHIFT 5 |
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#define IP6_VTI_HASH_SIZE (1 << IP6_VTI_HASH_SIZE_SHIFT) |
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|
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static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) |
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{ |
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u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); |
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|
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return hash_32(hash, IP6_VTI_HASH_SIZE_SHIFT); |
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} |
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|
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static int vti6_dev_init(struct net_device *dev); |
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static void vti6_dev_setup(struct net_device *dev); |
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static struct rtnl_link_ops vti6_link_ops __read_mostly; |
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|
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static unsigned int vti6_net_id __read_mostly; |
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struct vti6_net { |
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/* the vti6 tunnel fallback device */ |
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struct net_device *fb_tnl_dev; |
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/* lists for storing tunnels in use */ |
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struct ip6_tnl __rcu *tnls_r_l[IP6_VTI_HASH_SIZE]; |
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struct ip6_tnl __rcu *tnls_wc[1]; |
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struct ip6_tnl __rcu **tnls[2]; |
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}; |
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|
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#define for_each_vti6_tunnel_rcu(start) \ |
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for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) |
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|
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/** |
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* vti6_tnl_lookup - fetch tunnel matching the end-point addresses |
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* @net: network namespace |
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* @remote: the address of the tunnel exit-point |
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* @local: the address of the tunnel entry-point |
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* |
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* Return: |
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* tunnel matching given end-points if found, |
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* else fallback tunnel if its device is up, |
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* else %NULL |
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**/ |
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static struct ip6_tnl * |
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vti6_tnl_lookup(struct net *net, const struct in6_addr *remote, |
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const struct in6_addr *local) |
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{ |
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unsigned int hash = HASH(remote, local); |
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struct ip6_tnl *t; |
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struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
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struct in6_addr any; |
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|
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for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
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if (ipv6_addr_equal(local, &t->parms.laddr) && |
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ipv6_addr_equal(remote, &t->parms.raddr) && |
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(t->dev->flags & IFF_UP)) |
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return t; |
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} |
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|
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memset(&any, 0, sizeof(any)); |
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hash = HASH(&any, local); |
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for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
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if (ipv6_addr_equal(local, &t->parms.laddr) && |
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(t->dev->flags & IFF_UP)) |
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return t; |
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} |
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|
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hash = HASH(remote, &any); |
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for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
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if (ipv6_addr_equal(remote, &t->parms.raddr) && |
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(t->dev->flags & IFF_UP)) |
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return t; |
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} |
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|
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t = rcu_dereference(ip6n->tnls_wc[0]); |
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if (t && (t->dev->flags & IFF_UP)) |
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return t; |
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|
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return NULL; |
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} |
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|
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/** |
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* vti6_tnl_bucket - get head of list matching given tunnel parameters |
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* @ip6n: the private data for ip6_vti in the netns |
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* @p: parameters containing tunnel end-points |
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* |
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* Description: |
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* vti6_tnl_bucket() returns the head of the list matching the |
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* &struct in6_addr entries laddr and raddr in @p. |
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* |
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* Return: head of IPv6 tunnel list |
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**/ |
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static struct ip6_tnl __rcu ** |
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vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p) |
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{ |
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const struct in6_addr *remote = &p->raddr; |
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const struct in6_addr *local = &p->laddr; |
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unsigned int h = 0; |
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int prio = 0; |
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|
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if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { |
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prio = 1; |
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h = HASH(remote, local); |
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} |
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return &ip6n->tnls[prio][h]; |
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} |
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|
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static void |
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vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t) |
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{ |
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struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms); |
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|
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rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
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rcu_assign_pointer(*tp, t); |
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} |
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|
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static void |
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vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t) |
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{ |
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struct ip6_tnl __rcu **tp; |
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struct ip6_tnl *iter; |
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|
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for (tp = vti6_tnl_bucket(ip6n, &t->parms); |
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(iter = rtnl_dereference(*tp)) != NULL; |
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tp = &iter->next) { |
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if (t == iter) { |
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rcu_assign_pointer(*tp, t->next); |
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break; |
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} |
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} |
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} |
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|
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static void vti6_dev_free(struct net_device *dev) |
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{ |
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free_percpu(dev->tstats); |
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} |
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|
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static int vti6_tnl_create2(struct net_device *dev) |
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{ |
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struct ip6_tnl *t = netdev_priv(dev); |
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struct net *net = dev_net(dev); |
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struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
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int err; |
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|
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dev->rtnl_link_ops = &vti6_link_ops; |
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err = register_netdevice(dev); |
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if (err < 0) |
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goto out; |
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|
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strcpy(t->parms.name, dev->name); |
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|
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vti6_tnl_link(ip6n, t); |
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|
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return 0; |
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|
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out: |
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return err; |
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} |
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|
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static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) |
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{ |
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struct net_device *dev; |
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struct ip6_tnl *t; |
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char name[IFNAMSIZ]; |
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int err; |
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|
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if (p->name[0]) { |
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if (!dev_valid_name(p->name)) |
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goto failed; |
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strlcpy(name, p->name, IFNAMSIZ); |
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} else { |
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sprintf(name, "ip6_vti%%d"); |
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} |
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|
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dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup); |
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if (!dev) |
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goto failed; |
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|
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dev_net_set(dev, net); |
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|
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t = netdev_priv(dev); |
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t->parms = *p; |
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t->net = dev_net(dev); |
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|
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err = vti6_tnl_create2(dev); |
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if (err < 0) |
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goto failed_free; |
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|
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return t; |
|
|
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failed_free: |
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free_netdev(dev); |
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failed: |
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return NULL; |
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} |
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|
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/** |
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* vti6_locate - find or create tunnel matching given parameters |
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* @net: network namespace |
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* @p: tunnel parameters |
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* @create: != 0 if allowed to create new tunnel if no match found |
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* |
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* Description: |
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* vti6_locate() first tries to locate an existing tunnel |
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* based on @parms. If this is unsuccessful, but @create is set a new |
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* tunnel device is created and registered for use. |
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* |
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* Return: |
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* matching tunnel or NULL |
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**/ |
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static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p, |
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int create) |
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{ |
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const struct in6_addr *remote = &p->raddr; |
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const struct in6_addr *local = &p->laddr; |
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struct ip6_tnl __rcu **tp; |
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struct ip6_tnl *t; |
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struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
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|
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for (tp = vti6_tnl_bucket(ip6n, p); |
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(t = rtnl_dereference(*tp)) != NULL; |
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tp = &t->next) { |
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if (ipv6_addr_equal(local, &t->parms.laddr) && |
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ipv6_addr_equal(remote, &t->parms.raddr)) { |
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if (create) |
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return NULL; |
|
|
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return t; |
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} |
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} |
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if (!create) |
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return NULL; |
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return vti6_tnl_create(net, p); |
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} |
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|
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/** |
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* vti6_dev_uninit - tunnel device uninitializer |
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* @dev: the device to be destroyed |
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* |
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* Description: |
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* vti6_dev_uninit() removes tunnel from its list |
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**/ |
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static void vti6_dev_uninit(struct net_device *dev) |
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{ |
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struct ip6_tnl *t = netdev_priv(dev); |
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struct vti6_net *ip6n = net_generic(t->net, vti6_net_id); |
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|
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if (dev == ip6n->fb_tnl_dev) |
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RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
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else |
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vti6_tnl_unlink(ip6n, t); |
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dev_put(dev); |
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} |
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|
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static int vti6_input_proto(struct sk_buff *skb, int nexthdr, __be32 spi, |
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int encap_type) |
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{ |
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struct ip6_tnl *t; |
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const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
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|
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rcu_read_lock(); |
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t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); |
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if (t) { |
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if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) { |
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rcu_read_unlock(); |
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goto discard; |
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} |
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|
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if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
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rcu_read_unlock(); |
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goto discard; |
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} |
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|
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ipv6h = ipv6_hdr(skb); |
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if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { |
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t->dev->stats.rx_dropped++; |
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rcu_read_unlock(); |
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goto discard; |
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} |
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|
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rcu_read_unlock(); |
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|
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XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t; |
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XFRM_SPI_SKB_CB(skb)->family = AF_INET6; |
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XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr); |
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return xfrm_input(skb, nexthdr, spi, encap_type); |
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} |
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rcu_read_unlock(); |
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return -EINVAL; |
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discard: |
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kfree_skb(skb); |
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return 0; |
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} |
|
|
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static int vti6_rcv(struct sk_buff *skb) |
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{ |
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int nexthdr = skb_network_header(skb)[IP6CB(skb)->nhoff]; |
|
|
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return vti6_input_proto(skb, nexthdr, 0, 0); |
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} |
|
|
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static int vti6_rcv_cb(struct sk_buff *skb, int err) |
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{ |
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unsigned short family; |
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struct net_device *dev; |
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struct xfrm_state *x; |
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const struct xfrm_mode *inner_mode; |
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struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6; |
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u32 orig_mark = skb->mark; |
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int ret; |
|
|
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if (!t) |
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return 1; |
|
|
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dev = t->dev; |
|
|
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if (err) { |
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dev->stats.rx_errors++; |
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dev->stats.rx_dropped++; |
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|
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return 0; |
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} |
|
|
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x = xfrm_input_state(skb); |
|
|
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inner_mode = &x->inner_mode; |
|
|
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if (x->sel.family == AF_UNSPEC) { |
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inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); |
|
if (inner_mode == NULL) { |
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XFRM_INC_STATS(dev_net(skb->dev), |
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LINUX_MIB_XFRMINSTATEMODEERROR); |
|
return -EINVAL; |
|
} |
|
} |
|
|
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family = inner_mode->family; |
|
|
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skb->mark = be32_to_cpu(t->parms.i_key); |
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ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family); |
|
skb->mark = orig_mark; |
|
|
|
if (!ret) |
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return -EPERM; |
|
|
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skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev))); |
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skb->dev = dev; |
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dev_sw_netstats_rx_add(dev, skb->len); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* vti6_addr_conflict - compare packet addresses to tunnel's own |
|
* @t: the outgoing tunnel device |
|
* @hdr: IPv6 header from the incoming packet |
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* |
|
* Description: |
|
* Avoid trivial tunneling loop by checking that tunnel exit-point |
|
* doesn't match source of incoming packet. |
|
* |
|
* Return: |
|
* 1 if conflict, |
|
* 0 else |
|
**/ |
|
static inline bool |
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vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
|
{ |
|
return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); |
|
} |
|
|
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static bool vti6_state_check(const struct xfrm_state *x, |
|
const struct in6_addr *dst, |
|
const struct in6_addr *src) |
|
{ |
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xfrm_address_t *daddr = (xfrm_address_t *)dst; |
|
xfrm_address_t *saddr = (xfrm_address_t *)src; |
|
|
|
/* if there is no transform then this tunnel is not functional. |
|
* Or if the xfrm is not mode tunnel. |
|
*/ |
|
if (!x || x->props.mode != XFRM_MODE_TUNNEL || |
|
x->props.family != AF_INET6) |
|
return false; |
|
|
|
if (ipv6_addr_any(dst)) |
|
return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6); |
|
|
|
if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6)) |
|
return false; |
|
|
|
return true; |
|
} |
|
|
|
/** |
|
* vti6_xmit - send a packet |
|
* @skb: the outgoing socket buffer |
|
* @dev: the outgoing tunnel device |
|
* @fl: the flow informations for the xfrm_lookup |
|
**/ |
|
static int |
|
vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl) |
|
{ |
|
struct ip6_tnl *t = netdev_priv(dev); |
|
struct net_device_stats *stats = &t->dev->stats; |
|
struct dst_entry *dst = skb_dst(skb); |
|
struct net_device *tdev; |
|
struct xfrm_state *x; |
|
int pkt_len = skb->len; |
|
int err = -1; |
|
int mtu; |
|
|
|
if (!dst) { |
|
switch (skb->protocol) { |
|
case htons(ETH_P_IP): { |
|
struct rtable *rt; |
|
|
|
fl->u.ip4.flowi4_oif = dev->ifindex; |
|
fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC; |
|
rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4); |
|
if (IS_ERR(rt)) |
|
goto tx_err_link_failure; |
|
dst = &rt->dst; |
|
skb_dst_set(skb, dst); |
|
break; |
|
} |
|
case htons(ETH_P_IPV6): |
|
fl->u.ip6.flowi6_oif = dev->ifindex; |
|
fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC; |
|
dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6); |
|
if (dst->error) { |
|
dst_release(dst); |
|
dst = NULL; |
|
goto tx_err_link_failure; |
|
} |
|
skb_dst_set(skb, dst); |
|
break; |
|
default: |
|
goto tx_err_link_failure; |
|
} |
|
} |
|
|
|
dst_hold(dst); |
|
dst = xfrm_lookup_route(t->net, dst, fl, NULL, 0); |
|
if (IS_ERR(dst)) { |
|
err = PTR_ERR(dst); |
|
dst = NULL; |
|
goto tx_err_link_failure; |
|
} |
|
|
|
if (dst->flags & DST_XFRM_QUEUE) |
|
goto xmit; |
|
|
|
x = dst->xfrm; |
|
if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr)) |
|
goto tx_err_link_failure; |
|
|
|
if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr, |
|
(const struct in6_addr *)&x->id.daddr)) |
|
goto tx_err_link_failure; |
|
|
|
tdev = dst->dev; |
|
|
|
if (tdev == dev) { |
|
stats->collisions++; |
|
net_warn_ratelimited("%s: Local routing loop detected!\n", |
|
t->parms.name); |
|
goto tx_err_dst_release; |
|
} |
|
|
|
mtu = dst_mtu(dst); |
|
if (skb->len > mtu) { |
|
skb_dst_update_pmtu_no_confirm(skb, mtu); |
|
|
|
if (skb->protocol == htons(ETH_P_IPV6)) { |
|
if (mtu < IPV6_MIN_MTU) |
|
mtu = IPV6_MIN_MTU; |
|
|
|
icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
|
} else { |
|
if (!(ip_hdr(skb)->frag_off & htons(IP_DF))) |
|
goto xmit; |
|
icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
|
htonl(mtu)); |
|
} |
|
|
|
err = -EMSGSIZE; |
|
goto tx_err_dst_release; |
|
} |
|
|
|
xmit: |
|
skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
|
skb_dst_set(skb, dst); |
|
skb->dev = skb_dst(skb)->dev; |
|
|
|
err = dst_output(t->net, skb->sk, skb); |
|
if (net_xmit_eval(err) == 0) |
|
err = pkt_len; |
|
iptunnel_xmit_stats(dev, err); |
|
|
|
return 0; |
|
tx_err_link_failure: |
|
stats->tx_carrier_errors++; |
|
dst_link_failure(skb); |
|
tx_err_dst_release: |
|
dst_release(dst); |
|
return err; |
|
} |
|
|
|
static netdev_tx_t |
|
vti6_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; |
|
struct flowi fl; |
|
int ret; |
|
|
|
if (!pskb_inet_may_pull(skb)) |
|
goto tx_err; |
|
|
|
memset(&fl, 0, sizeof(fl)); |
|
|
|
switch (skb->protocol) { |
|
case htons(ETH_P_IPV6): |
|
if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
|
vti6_addr_conflict(t, ipv6_hdr(skb))) |
|
goto tx_err; |
|
|
|
xfrm_decode_session(skb, &fl, AF_INET6); |
|
memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); |
|
break; |
|
case htons(ETH_P_IP): |
|
xfrm_decode_session(skb, &fl, AF_INET); |
|
memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
|
break; |
|
default: |
|
goto tx_err; |
|
} |
|
|
|
/* override mark with tunnel output key */ |
|
fl.flowi_mark = be32_to_cpu(t->parms.o_key); |
|
|
|
ret = vti6_xmit(skb, dev, &fl); |
|
if (ret < 0) |
|
goto tx_err; |
|
|
|
return NETDEV_TX_OK; |
|
|
|
tx_err: |
|
stats->tx_errors++; |
|
stats->tx_dropped++; |
|
kfree_skb(skb); |
|
return NETDEV_TX_OK; |
|
} |
|
|
|
static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
|
u8 type, u8 code, int offset, __be32 info) |
|
{ |
|
__be32 spi; |
|
__u32 mark; |
|
struct xfrm_state *x; |
|
struct ip6_tnl *t; |
|
struct ip_esp_hdr *esph; |
|
struct ip_auth_hdr *ah; |
|
struct ip_comp_hdr *ipch; |
|
struct net *net = dev_net(skb->dev); |
|
const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; |
|
int protocol = iph->nexthdr; |
|
|
|
t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr); |
|
if (!t) |
|
return -1; |
|
|
|
mark = be32_to_cpu(t->parms.o_key); |
|
|
|
switch (protocol) { |
|
case IPPROTO_ESP: |
|
esph = (struct ip_esp_hdr *)(skb->data + offset); |
|
spi = esph->spi; |
|
break; |
|
case IPPROTO_AH: |
|
ah = (struct ip_auth_hdr *)(skb->data + offset); |
|
spi = ah->spi; |
|
break; |
|
case IPPROTO_COMP: |
|
ipch = (struct ip_comp_hdr *)(skb->data + offset); |
|
spi = htonl(ntohs(ipch->cpi)); |
|
break; |
|
default: |
|
return 0; |
|
} |
|
|
|
if (type != ICMPV6_PKT_TOOBIG && |
|
type != NDISC_REDIRECT) |
|
return 0; |
|
|
|
x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr, |
|
spi, protocol, AF_INET6); |
|
if (!x) |
|
return 0; |
|
|
|
if (type == NDISC_REDIRECT) |
|
ip6_redirect(skb, net, skb->dev->ifindex, 0, |
|
sock_net_uid(net, NULL)); |
|
else |
|
ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); |
|
xfrm_state_put(x); |
|
|
|
return 0; |
|
} |
|
|
|
static void vti6_link_config(struct ip6_tnl *t, bool keep_mtu) |
|
{ |
|
struct net_device *dev = t->dev; |
|
struct __ip6_tnl_parm *p = &t->parms; |
|
struct net_device *tdev = NULL; |
|
int mtu; |
|
|
|
memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
|
memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); |
|
|
|
p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV | |
|
IP6_TNL_F_CAP_PER_PACKET); |
|
p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); |
|
|
|
if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV) |
|
dev->flags |= IFF_POINTOPOINT; |
|
else |
|
dev->flags &= ~IFF_POINTOPOINT; |
|
|
|
if (keep_mtu && dev->mtu) { |
|
dev->mtu = clamp(dev->mtu, dev->min_mtu, dev->max_mtu); |
|
return; |
|
} |
|
|
|
if (p->flags & IP6_TNL_F_CAP_XMIT) { |
|
int strict = (ipv6_addr_type(&p->raddr) & |
|
(IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); |
|
struct rt6_info *rt = rt6_lookup(t->net, |
|
&p->raddr, &p->laddr, |
|
p->link, NULL, strict); |
|
|
|
if (rt) |
|
tdev = rt->dst.dev; |
|
ip6_rt_put(rt); |
|
} |
|
|
|
if (!tdev && p->link) |
|
tdev = __dev_get_by_index(t->net, p->link); |
|
|
|
if (tdev) |
|
mtu = tdev->mtu - sizeof(struct ipv6hdr); |
|
else |
|
mtu = ETH_DATA_LEN - LL_MAX_HEADER - sizeof(struct ipv6hdr); |
|
|
|
dev->mtu = max_t(int, mtu, IPV4_MIN_MTU); |
|
} |
|
|
|
/** |
|
* vti6_tnl_change - update the tunnel parameters |
|
* @t: tunnel to be changed |
|
* @p: tunnel configuration parameters |
|
* @keep_mtu: MTU was set from userspace, don't re-compute it |
|
* |
|
* Description: |
|
* vti6_tnl_change() updates the tunnel parameters |
|
**/ |
|
static int |
|
vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, |
|
bool keep_mtu) |
|
{ |
|
t->parms.laddr = p->laddr; |
|
t->parms.raddr = p->raddr; |
|
t->parms.link = p->link; |
|
t->parms.i_key = p->i_key; |
|
t->parms.o_key = p->o_key; |
|
t->parms.proto = p->proto; |
|
t->parms.fwmark = p->fwmark; |
|
dst_cache_reset(&t->dst_cache); |
|
vti6_link_config(t, keep_mtu); |
|
return 0; |
|
} |
|
|
|
static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p, |
|
bool keep_mtu) |
|
{ |
|
struct net *net = dev_net(t->dev); |
|
struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
|
int err; |
|
|
|
vti6_tnl_unlink(ip6n, t); |
|
synchronize_net(); |
|
err = vti6_tnl_change(t, p, keep_mtu); |
|
vti6_tnl_link(ip6n, t); |
|
netdev_state_change(t->dev); |
|
return err; |
|
} |
|
|
|
static void |
|
vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u) |
|
{ |
|
p->laddr = u->laddr; |
|
p->raddr = u->raddr; |
|
p->link = u->link; |
|
p->i_key = u->i_key; |
|
p->o_key = u->o_key; |
|
p->proto = u->proto; |
|
|
|
memcpy(p->name, u->name, sizeof(u->name)); |
|
} |
|
|
|
static void |
|
vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p) |
|
{ |
|
u->laddr = p->laddr; |
|
u->raddr = p->raddr; |
|
u->link = p->link; |
|
u->i_key = p->i_key; |
|
u->o_key = p->o_key; |
|
if (u->i_key) |
|
u->i_flags |= GRE_KEY; |
|
if (u->o_key) |
|
u->o_flags |= GRE_KEY; |
|
u->proto = p->proto; |
|
|
|
memcpy(u->name, p->name, sizeof(u->name)); |
|
} |
|
|
|
/** |
|
* vti6_siocdevprivate - configure vti6 tunnels from userspace |
|
* @dev: virtual device associated with tunnel |
|
* @ifr: unused |
|
* @data: parameters passed from userspace |
|
* @cmd: command to be performed |
|
* |
|
* Description: |
|
* vti6_siocdevprivate() is used for managing vti6 tunnels |
|
* from userspace. |
|
* |
|
* The possible commands are the following: |
|
* %SIOCGETTUNNEL: get tunnel parameters for device |
|
* %SIOCADDTUNNEL: add tunnel matching given tunnel parameters |
|
* %SIOCCHGTUNNEL: change tunnel parameters to those given |
|
* %SIOCDELTUNNEL: delete tunnel |
|
* |
|
* The fallback device "ip6_vti0", created during module |
|
* initialization, can be used for creating other tunnel devices. |
|
* |
|
* Return: |
|
* 0 on success, |
|
* %-EFAULT if unable to copy data to or from userspace, |
|
* %-EPERM if current process hasn't %CAP_NET_ADMIN set |
|
* %-EINVAL if passed tunnel parameters are invalid, |
|
* %-EEXIST if changing a tunnel's parameters would cause a conflict |
|
* %-ENODEV if attempting to change or delete a nonexisting device |
|
**/ |
|
static int |
|
vti6_siocdevprivate(struct net_device *dev, struct ifreq *ifr, void __user *data, int cmd) |
|
{ |
|
int err = 0; |
|
struct ip6_tnl_parm2 p; |
|
struct __ip6_tnl_parm p1; |
|
struct ip6_tnl *t = NULL; |
|
struct net *net = dev_net(dev); |
|
struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
|
|
|
switch (cmd) { |
|
case SIOCGETTUNNEL: |
|
if (dev == ip6n->fb_tnl_dev) { |
|
if (copy_from_user(&p, data, sizeof(p))) { |
|
err = -EFAULT; |
|
break; |
|
} |
|
vti6_parm_from_user(&p1, &p); |
|
t = vti6_locate(net, &p1, 0); |
|
} else { |
|
memset(&p, 0, sizeof(p)); |
|
} |
|
if (!t) |
|
t = netdev_priv(dev); |
|
vti6_parm_to_user(&p, &t->parms); |
|
if (copy_to_user(data, &p, sizeof(p))) |
|
err = -EFAULT; |
|
break; |
|
case SIOCADDTUNNEL: |
|
case SIOCCHGTUNNEL: |
|
err = -EPERM; |
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
|
break; |
|
err = -EFAULT; |
|
if (copy_from_user(&p, data, sizeof(p))) |
|
break; |
|
err = -EINVAL; |
|
if (p.proto != IPPROTO_IPV6 && p.proto != 0) |
|
break; |
|
vti6_parm_from_user(&p1, &p); |
|
t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL); |
|
if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
|
if (t) { |
|
if (t->dev != dev) { |
|
err = -EEXIST; |
|
break; |
|
} |
|
} else |
|
t = netdev_priv(dev); |
|
|
|
err = vti6_update(t, &p1, false); |
|
} |
|
if (t) { |
|
err = 0; |
|
vti6_parm_to_user(&p, &t->parms); |
|
if (copy_to_user(data, &p, sizeof(p))) |
|
err = -EFAULT; |
|
|
|
} else |
|
err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); |
|
break; |
|
case SIOCDELTUNNEL: |
|
err = -EPERM; |
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
|
break; |
|
|
|
if (dev == ip6n->fb_tnl_dev) { |
|
err = -EFAULT; |
|
if (copy_from_user(&p, data, sizeof(p))) |
|
break; |
|
err = -ENOENT; |
|
vti6_parm_from_user(&p1, &p); |
|
t = vti6_locate(net, &p1, 0); |
|
if (!t) |
|
break; |
|
err = -EPERM; |
|
if (t->dev == ip6n->fb_tnl_dev) |
|
break; |
|
dev = t->dev; |
|
} |
|
err = 0; |
|
unregister_netdevice(dev); |
|
break; |
|
default: |
|
err = -EINVAL; |
|
} |
|
return err; |
|
} |
|
|
|
static const struct net_device_ops vti6_netdev_ops = { |
|
.ndo_init = vti6_dev_init, |
|
.ndo_uninit = vti6_dev_uninit, |
|
.ndo_start_xmit = vti6_tnl_xmit, |
|
.ndo_siocdevprivate = vti6_siocdevprivate, |
|
.ndo_get_stats64 = dev_get_tstats64, |
|
.ndo_get_iflink = ip6_tnl_get_iflink, |
|
}; |
|
|
|
/** |
|
* vti6_dev_setup - setup virtual tunnel device |
|
* @dev: virtual device associated with tunnel |
|
* |
|
* Description: |
|
* Initialize function pointers and device parameters |
|
**/ |
|
static void vti6_dev_setup(struct net_device *dev) |
|
{ |
|
dev->netdev_ops = &vti6_netdev_ops; |
|
dev->header_ops = &ip_tunnel_header_ops; |
|
dev->needs_free_netdev = true; |
|
dev->priv_destructor = vti6_dev_free; |
|
|
|
dev->type = ARPHRD_TUNNEL6; |
|
dev->min_mtu = IPV4_MIN_MTU; |
|
dev->max_mtu = IP_MAX_MTU - sizeof(struct ipv6hdr); |
|
dev->flags |= IFF_NOARP; |
|
dev->addr_len = sizeof(struct in6_addr); |
|
netif_keep_dst(dev); |
|
/* This perm addr will be used as interface identifier by IPv6 */ |
|
dev->addr_assign_type = NET_ADDR_RANDOM; |
|
eth_random_addr(dev->perm_addr); |
|
} |
|
|
|
/** |
|
* vti6_dev_init_gen - general initializer for all tunnel devices |
|
* @dev: virtual device associated with tunnel |
|
**/ |
|
static inline int vti6_dev_init_gen(struct net_device *dev) |
|
{ |
|
struct ip6_tnl *t = netdev_priv(dev); |
|
|
|
t->dev = dev; |
|
t->net = dev_net(dev); |
|
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
|
if (!dev->tstats) |
|
return -ENOMEM; |
|
dev_hold(dev); |
|
return 0; |
|
} |
|
|
|
/** |
|
* vti6_dev_init - initializer for all non fallback tunnel devices |
|
* @dev: virtual device associated with tunnel |
|
**/ |
|
static int vti6_dev_init(struct net_device *dev) |
|
{ |
|
struct ip6_tnl *t = netdev_priv(dev); |
|
int err = vti6_dev_init_gen(dev); |
|
|
|
if (err) |
|
return err; |
|
vti6_link_config(t, true); |
|
return 0; |
|
} |
|
|
|
/** |
|
* vti6_fb_tnl_dev_init - initializer for fallback tunnel device |
|
* @dev: fallback device |
|
* |
|
* Return: 0 |
|
**/ |
|
static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev) |
|
{ |
|
struct ip6_tnl *t = netdev_priv(dev); |
|
struct net *net = dev_net(dev); |
|
struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
|
|
|
t->parms.proto = IPPROTO_IPV6; |
|
|
|
rcu_assign_pointer(ip6n->tnls_wc[0], t); |
|
return 0; |
|
} |
|
|
|
static int vti6_validate(struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
return 0; |
|
} |
|
|
|
static void vti6_netlink_parms(struct nlattr *data[], |
|
struct __ip6_tnl_parm *parms) |
|
{ |
|
memset(parms, 0, sizeof(*parms)); |
|
|
|
if (!data) |
|
return; |
|
|
|
if (data[IFLA_VTI_LINK]) |
|
parms->link = nla_get_u32(data[IFLA_VTI_LINK]); |
|
|
|
if (data[IFLA_VTI_LOCAL]) |
|
parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]); |
|
|
|
if (data[IFLA_VTI_REMOTE]) |
|
parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]); |
|
|
|
if (data[IFLA_VTI_IKEY]) |
|
parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]); |
|
|
|
if (data[IFLA_VTI_OKEY]) |
|
parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]); |
|
|
|
if (data[IFLA_VTI_FWMARK]) |
|
parms->fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]); |
|
} |
|
|
|
static int vti6_newlink(struct net *src_net, struct net_device *dev, |
|
struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct net *net = dev_net(dev); |
|
struct ip6_tnl *nt; |
|
|
|
nt = netdev_priv(dev); |
|
vti6_netlink_parms(data, &nt->parms); |
|
|
|
nt->parms.proto = IPPROTO_IPV6; |
|
|
|
if (vti6_locate(net, &nt->parms, 0)) |
|
return -EEXIST; |
|
|
|
return vti6_tnl_create2(dev); |
|
} |
|
|
|
static void vti6_dellink(struct net_device *dev, struct list_head *head) |
|
{ |
|
struct net *net = dev_net(dev); |
|
struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
|
|
|
if (dev != ip6n->fb_tnl_dev) |
|
unregister_netdevice_queue(dev, head); |
|
} |
|
|
|
static int vti6_changelink(struct net_device *dev, struct nlattr *tb[], |
|
struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct ip6_tnl *t; |
|
struct __ip6_tnl_parm p; |
|
struct net *net = dev_net(dev); |
|
struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
|
|
|
if (dev == ip6n->fb_tnl_dev) |
|
return -EINVAL; |
|
|
|
vti6_netlink_parms(data, &p); |
|
|
|
t = vti6_locate(net, &p, 0); |
|
|
|
if (t) { |
|
if (t->dev != dev) |
|
return -EEXIST; |
|
} else |
|
t = netdev_priv(dev); |
|
|
|
return vti6_update(t, &p, tb && tb[IFLA_MTU]); |
|
} |
|
|
|
static size_t vti6_get_size(const struct net_device *dev) |
|
{ |
|
return |
|
/* IFLA_VTI_LINK */ |
|
nla_total_size(4) + |
|
/* IFLA_VTI_LOCAL */ |
|
nla_total_size(sizeof(struct in6_addr)) + |
|
/* IFLA_VTI_REMOTE */ |
|
nla_total_size(sizeof(struct in6_addr)) + |
|
/* IFLA_VTI_IKEY */ |
|
nla_total_size(4) + |
|
/* IFLA_VTI_OKEY */ |
|
nla_total_size(4) + |
|
/* IFLA_VTI_FWMARK */ |
|
nla_total_size(4) + |
|
0; |
|
} |
|
|
|
static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev) |
|
{ |
|
struct ip6_tnl *tunnel = netdev_priv(dev); |
|
struct __ip6_tnl_parm *parm = &tunnel->parms; |
|
|
|
if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) || |
|
nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) || |
|
nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) || |
|
nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) || |
|
nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key) || |
|
nla_put_u32(skb, IFLA_VTI_FWMARK, parm->fwmark)) |
|
goto nla_put_failure; |
|
return 0; |
|
|
|
nla_put_failure: |
|
return -EMSGSIZE; |
|
} |
|
|
|
static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = { |
|
[IFLA_VTI_LINK] = { .type = NLA_U32 }, |
|
[IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) }, |
|
[IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) }, |
|
[IFLA_VTI_IKEY] = { .type = NLA_U32 }, |
|
[IFLA_VTI_OKEY] = { .type = NLA_U32 }, |
|
[IFLA_VTI_FWMARK] = { .type = NLA_U32 }, |
|
}; |
|
|
|
static struct rtnl_link_ops vti6_link_ops __read_mostly = { |
|
.kind = "vti6", |
|
.maxtype = IFLA_VTI_MAX, |
|
.policy = vti6_policy, |
|
.priv_size = sizeof(struct ip6_tnl), |
|
.setup = vti6_dev_setup, |
|
.validate = vti6_validate, |
|
.newlink = vti6_newlink, |
|
.dellink = vti6_dellink, |
|
.changelink = vti6_changelink, |
|
.get_size = vti6_get_size, |
|
.fill_info = vti6_fill_info, |
|
.get_link_net = ip6_tnl_get_link_net, |
|
}; |
|
|
|
static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n, |
|
struct list_head *list) |
|
{ |
|
int h; |
|
struct ip6_tnl *t; |
|
|
|
for (h = 0; h < IP6_VTI_HASH_SIZE; h++) { |
|
t = rtnl_dereference(ip6n->tnls_r_l[h]); |
|
while (t) { |
|
unregister_netdevice_queue(t->dev, list); |
|
t = rtnl_dereference(t->next); |
|
} |
|
} |
|
|
|
t = rtnl_dereference(ip6n->tnls_wc[0]); |
|
if (t) |
|
unregister_netdevice_queue(t->dev, list); |
|
} |
|
|
|
static int __net_init vti6_init_net(struct net *net) |
|
{ |
|
struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
|
struct ip6_tnl *t = NULL; |
|
int err; |
|
|
|
ip6n->tnls[0] = ip6n->tnls_wc; |
|
ip6n->tnls[1] = ip6n->tnls_r_l; |
|
|
|
if (!net_has_fallback_tunnels(net)) |
|
return 0; |
|
err = -ENOMEM; |
|
ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0", |
|
NET_NAME_UNKNOWN, vti6_dev_setup); |
|
|
|
if (!ip6n->fb_tnl_dev) |
|
goto err_alloc_dev; |
|
dev_net_set(ip6n->fb_tnl_dev, net); |
|
ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops; |
|
|
|
err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
|
if (err < 0) |
|
goto err_register; |
|
|
|
err = register_netdev(ip6n->fb_tnl_dev); |
|
if (err < 0) |
|
goto err_register; |
|
|
|
t = netdev_priv(ip6n->fb_tnl_dev); |
|
|
|
strcpy(t->parms.name, ip6n->fb_tnl_dev->name); |
|
return 0; |
|
|
|
err_register: |
|
free_netdev(ip6n->fb_tnl_dev); |
|
err_alloc_dev: |
|
return err; |
|
} |
|
|
|
static void __net_exit vti6_exit_batch_net(struct list_head *net_list) |
|
{ |
|
struct vti6_net *ip6n; |
|
struct net *net; |
|
LIST_HEAD(list); |
|
|
|
rtnl_lock(); |
|
list_for_each_entry(net, net_list, exit_list) { |
|
ip6n = net_generic(net, vti6_net_id); |
|
vti6_destroy_tunnels(ip6n, &list); |
|
} |
|
unregister_netdevice_many(&list); |
|
rtnl_unlock(); |
|
} |
|
|
|
static struct pernet_operations vti6_net_ops = { |
|
.init = vti6_init_net, |
|
.exit_batch = vti6_exit_batch_net, |
|
.id = &vti6_net_id, |
|
.size = sizeof(struct vti6_net), |
|
}; |
|
|
|
static struct xfrm6_protocol vti_esp6_protocol __read_mostly = { |
|
.handler = vti6_rcv, |
|
.input_handler = vti6_input_proto, |
|
.cb_handler = vti6_rcv_cb, |
|
.err_handler = vti6_err, |
|
.priority = 100, |
|
}; |
|
|
|
static struct xfrm6_protocol vti_ah6_protocol __read_mostly = { |
|
.handler = vti6_rcv, |
|
.input_handler = vti6_input_proto, |
|
.cb_handler = vti6_rcv_cb, |
|
.err_handler = vti6_err, |
|
.priority = 100, |
|
}; |
|
|
|
static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = { |
|
.handler = vti6_rcv, |
|
.input_handler = vti6_input_proto, |
|
.cb_handler = vti6_rcv_cb, |
|
.err_handler = vti6_err, |
|
.priority = 100, |
|
}; |
|
|
|
#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) |
|
static int vti6_rcv_tunnel(struct sk_buff *skb) |
|
{ |
|
const xfrm_address_t *saddr; |
|
__be32 spi; |
|
|
|
saddr = (const xfrm_address_t *)&ipv6_hdr(skb)->saddr; |
|
spi = xfrm6_tunnel_spi_lookup(dev_net(skb->dev), saddr); |
|
|
|
return vti6_input_proto(skb, IPPROTO_IPV6, spi, 0); |
|
} |
|
|
|
static struct xfrm6_tunnel vti_ipv6_handler __read_mostly = { |
|
.handler = vti6_rcv_tunnel, |
|
.cb_handler = vti6_rcv_cb, |
|
.err_handler = vti6_err, |
|
.priority = 0, |
|
}; |
|
|
|
static struct xfrm6_tunnel vti_ip6ip_handler __read_mostly = { |
|
.handler = vti6_rcv_tunnel, |
|
.cb_handler = vti6_rcv_cb, |
|
.err_handler = vti6_err, |
|
.priority = 0, |
|
}; |
|
#endif |
|
|
|
/** |
|
* vti6_tunnel_init - register protocol and reserve needed resources |
|
* |
|
* Return: 0 on success |
|
**/ |
|
static int __init vti6_tunnel_init(void) |
|
{ |
|
const char *msg; |
|
int err; |
|
|
|
msg = "tunnel device"; |
|
err = register_pernet_device(&vti6_net_ops); |
|
if (err < 0) |
|
goto pernet_dev_failed; |
|
|
|
msg = "tunnel protocols"; |
|
err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP); |
|
if (err < 0) |
|
goto xfrm_proto_esp_failed; |
|
err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH); |
|
if (err < 0) |
|
goto xfrm_proto_ah_failed; |
|
err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP); |
|
if (err < 0) |
|
goto xfrm_proto_comp_failed; |
|
#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) |
|
msg = "ipv6 tunnel"; |
|
err = xfrm6_tunnel_register(&vti_ipv6_handler, AF_INET6); |
|
if (err < 0) |
|
goto vti_tunnel_ipv6_failed; |
|
err = xfrm6_tunnel_register(&vti_ip6ip_handler, AF_INET); |
|
if (err < 0) |
|
goto vti_tunnel_ip6ip_failed; |
|
#endif |
|
|
|
msg = "netlink interface"; |
|
err = rtnl_link_register(&vti6_link_ops); |
|
if (err < 0) |
|
goto rtnl_link_failed; |
|
|
|
return 0; |
|
|
|
rtnl_link_failed: |
|
#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) |
|
err = xfrm6_tunnel_deregister(&vti_ip6ip_handler, AF_INET); |
|
vti_tunnel_ip6ip_failed: |
|
err = xfrm6_tunnel_deregister(&vti_ipv6_handler, AF_INET6); |
|
vti_tunnel_ipv6_failed: |
|
#endif |
|
xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP); |
|
xfrm_proto_comp_failed: |
|
xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); |
|
xfrm_proto_ah_failed: |
|
xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); |
|
xfrm_proto_esp_failed: |
|
unregister_pernet_device(&vti6_net_ops); |
|
pernet_dev_failed: |
|
pr_err("vti6 init: failed to register %s\n", msg); |
|
return err; |
|
} |
|
|
|
/** |
|
* vti6_tunnel_cleanup - free resources and unregister protocol |
|
**/ |
|
static void __exit vti6_tunnel_cleanup(void) |
|
{ |
|
rtnl_link_unregister(&vti6_link_ops); |
|
#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) |
|
xfrm6_tunnel_deregister(&vti_ip6ip_handler, AF_INET); |
|
xfrm6_tunnel_deregister(&vti_ipv6_handler, AF_INET6); |
|
#endif |
|
xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP); |
|
xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); |
|
xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); |
|
unregister_pernet_device(&vti6_net_ops); |
|
} |
|
|
|
module_init(vti6_tunnel_init); |
|
module_exit(vti6_tunnel_cleanup); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS_RTNL_LINK("vti6"); |
|
MODULE_ALIAS_NETDEV("ip6_vti0"); |
|
MODULE_AUTHOR("Steffen Klassert"); |
|
MODULE_DESCRIPTION("IPv6 virtual tunnel interface");
|
|
|