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![Florian Westphal](/assets/img/avatar_default.png)
This structure is now only 4 bytes, so its more efficient to cache a copy rather than its address. No significant size difference in allmodconfig vmlinux. With non-modular kernel that has all XFRM options enabled, this series reduces vmlinux image size by ~11kb. All xfrm_mode indirections are gone and all modes are built-in. before (ipsec-next master): text data bss dec filename 21071494 7233140 11104324 39408958 vmlinux.master after this series: 21066448 7226772 11104324 39397544 vmlinux.patched With allmodconfig kernel, the size increase is only 362 bytes, even all the xfrm config options removed in this series are modular. before: text data bss dec filename 15731286 6936912 4046908 26715106 vmlinux.master after this series: 15731492 6937068 4046908 26715468 vmlinux Signed-off-by: Florian Westphal <fw@strlen.de> Reviewed-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
1248 lines
29 KiB
C
1248 lines
29 KiB
C
/*
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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 <steffen.klassert@secunet.com>
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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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#include <linux/uaccess.h>
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#include <linux/atomic.h>
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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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#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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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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return hash_32(hash, IP6_VTI_HASH_SIZE_SHIFT);
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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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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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#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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* 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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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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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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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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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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return NULL;
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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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* @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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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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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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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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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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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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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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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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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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strcpy(t->parms.name, dev->name);
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dev_hold(dev);
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vti6_tnl_link(ip6n, t);
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return 0;
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out:
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return err;
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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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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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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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dev_net_set(dev, net);
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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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err = vti6_tnl_create2(dev);
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if (err < 0)
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goto failed_free;
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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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* 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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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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* 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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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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static int vti6_rcv(struct sk_buff *skb)
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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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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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if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
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rcu_read_unlock();
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return 0;
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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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rcu_read_unlock();
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return xfrm6_rcv_tnl(skb, t);
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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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|
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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 pcpu_sw_netstats *tstats;
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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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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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|
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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);
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if (inner_mode == NULL) {
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XFRM_INC_STATS(dev_net(skb->dev),
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LINUX_MIB_XFRMINSTATEMODEERROR);
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return -EINVAL;
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}
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}
|
|
|
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family = inner_mode->family;
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|
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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);
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skb->mark = orig_mark;
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|
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if (!ret)
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return -EPERM;
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|
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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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|
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tstats = this_cpu_ptr(dev->tstats);
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u64_stats_update_begin(&tstats->syncp);
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tstats->rx_packets++;
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tstats->rx_bytes += skb->len;
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u64_stats_update_end(&tstats->syncp);
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|
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return 0;
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}
|
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|
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/**
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* vti6_addr_conflict - compare packet addresses to tunnel's own
|
|
* @t: the outgoing tunnel device
|
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* @hdr: IPv6 header from the incoming packet
|
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*
|
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* Description:
|
|
* Avoid trivial tunneling loop by checking that tunnel exit-point
|
|
* doesn't match source of incoming packet.
|
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*
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* Return:
|
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* 1 if conflict,
|
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* 0 else
|
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**/
|
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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);
|
|
}
|
|
|
|
static bool vti6_state_check(const struct xfrm_state *x,
|
|
const struct in6_addr *dst,
|
|
const struct in6_addr *src)
|
|
{
|
|
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.
|
|
*/
|
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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)
|
|
goto tx_err_link_failure;
|
|
|
|
dst_hold(dst);
|
|
dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
|
|
if (IS_ERR(dst)) {
|
|
err = PTR_ERR(dst);
|
|
dst = NULL;
|
|
goto tx_err_link_failure;
|
|
}
|
|
|
|
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(skb, mtu);
|
|
|
|
if (skb->protocol == htons(ETH_P_IPV6)) {
|
|
if (mtu < IPV6_MIN_MTU)
|
|
mtu = IPV6_MIN_MTU;
|
|
|
|
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
|
|
} else {
|
|
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
|
|
htonl(mtu));
|
|
}
|
|
|
|
err = -EMSGSIZE;
|
|
goto tx_err_dst_release;
|
|
}
|
|
|
|
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_ioctl - configure vti6 tunnels from userspace
|
|
* @dev: virtual device associated with tunnel
|
|
* @ifr: parameters passed from userspace
|
|
* @cmd: command to be performed
|
|
*
|
|
* Description:
|
|
* vti6_ioctl() 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_ioctl(struct net_device *dev, struct ifreq *ifr, 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, ifr->ifr_ifru.ifru_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(ifr->ifr_ifru.ifru_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, ifr->ifr_ifru.ifru_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(ifr->ifr_ifru.ifru_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, ifr->ifr_ifru.ifru_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_do_ioctl = vti6_ioctl,
|
|
.ndo_get_stats64 = ip_tunnel_get_stats64,
|
|
.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->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;
|
|
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;
|
|
dev_hold(dev);
|
|
|
|
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,
|
|
.cb_handler = vti6_rcv_cb,
|
|
.err_handler = vti6_err,
|
|
.priority = 100,
|
|
};
|
|
|
|
static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
|
|
.handler = vti6_rcv,
|
|
.cb_handler = vti6_rcv_cb,
|
|
.err_handler = vti6_err,
|
|
.priority = 100,
|
|
};
|
|
|
|
static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
|
|
.handler = vti6_rcv,
|
|
.cb_handler = vti6_rcv_cb,
|
|
.err_handler = vti6_err,
|
|
.priority = 100,
|
|
};
|
|
|
|
/**
|
|
* 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;
|
|
|
|
msg = "netlink interface";
|
|
err = rtnl_link_register(&vti6_link_ops);
|
|
if (err < 0)
|
|
goto rtnl_link_failed;
|
|
|
|
return 0;
|
|
|
|
rtnl_link_failed:
|
|
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);
|
|
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");
|