![Alexey Dobriyan](/assets/img/avatar_default.png)
Dunno, what was the idea, it wasn't used for a long time. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1507 lines
35 KiB
C
1507 lines
35 KiB
C
/*
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* IPv6 tunneling device
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* Linux INET6 implementation
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*
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* Authors:
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* Ville Nuorvala <vnuorval@tcs.hut.fi>
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* Yasuyuki Kozakai <kozakai@linux-ipv6.org>
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*
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* Based on:
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* linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
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*
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* RFC 2473
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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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*/
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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/if_tunnel.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 <asm/uaccess.h>
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#include <asm/atomic.h>
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#include <net/icmp.h>
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#include <net/ip.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/dsfield.h>
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#include <net/inet_ecn.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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MODULE_AUTHOR("Ville Nuorvala");
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MODULE_DESCRIPTION("IPv6 tunneling device");
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MODULE_LICENSE("GPL");
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#define IPV6_TLV_TEL_DST_SIZE 8
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#ifdef IP6_TNL_DEBUG
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#define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __func__)
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#else
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#define IP6_TNL_TRACE(x...) do {;} while(0)
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#endif
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#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
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#define IPV6_TCLASS_SHIFT 20
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#define HASH_SIZE 32
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#define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \
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(addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \
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(HASH_SIZE - 1))
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static void ip6_tnl_dev_init(struct net_device *dev);
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static void ip6_tnl_dev_setup(struct net_device *dev);
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static int ip6_tnl_net_id __read_mostly;
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struct ip6_tnl_net {
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/* the IPv6 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 *tnls_r_l[HASH_SIZE];
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struct ip6_tnl *tnls_wc[1];
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struct ip6_tnl **tnls[2];
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};
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/*
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* Locking : hash tables are protected by RCU and a spinlock
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*/
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static DEFINE_SPINLOCK(ip6_tnl_lock);
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static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
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{
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struct dst_entry *dst = t->dst_cache;
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if (dst && dst->obsolete &&
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dst->ops->check(dst, t->dst_cookie) == NULL) {
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t->dst_cache = NULL;
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dst_release(dst);
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return NULL;
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}
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return dst;
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}
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static inline void ip6_tnl_dst_reset(struct ip6_tnl *t)
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{
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dst_release(t->dst_cache);
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t->dst_cache = NULL;
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}
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static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
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{
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struct rt6_info *rt = (struct rt6_info *) dst;
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t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
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dst_release(t->dst_cache);
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t->dst_cache = dst;
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}
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/**
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* ip6_tnl_lookup - fetch tunnel matching the end-point addresses
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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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#define for_each_ip6_tunnel_rcu(start) \
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for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
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static struct ip6_tnl *
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ip6_tnl_lookup(struct net *net, struct in6_addr *remote, struct in6_addr *local)
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{
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unsigned h0 = HASH(remote);
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unsigned h1 = HASH(local);
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struct ip6_tnl *t;
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struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
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for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[h0 ^ h1]) {
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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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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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* ip6_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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* ip6_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 **
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ip6_tnl_bucket(struct ip6_tnl_net *ip6n, struct ip6_tnl_parm *p)
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{
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struct in6_addr *remote = &p->raddr;
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struct in6_addr *local = &p->laddr;
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unsigned 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) ^ HASH(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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* ip6_tnl_link - add tunnel to hash table
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* @t: tunnel to be added
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**/
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static void
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ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
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{
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struct ip6_tnl **tp = ip6_tnl_bucket(ip6n, &t->parms);
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spin_lock_bh(&ip6_tnl_lock);
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t->next = *tp;
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rcu_assign_pointer(*tp, t);
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spin_unlock_bh(&ip6_tnl_lock);
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}
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/**
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* ip6_tnl_unlink - remove tunnel from hash table
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* @t: tunnel to be removed
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**/
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static void
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ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
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{
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struct ip6_tnl **tp;
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for (tp = ip6_tnl_bucket(ip6n, &t->parms); *tp; tp = &(*tp)->next) {
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if (t == *tp) {
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spin_lock_bh(&ip6_tnl_lock);
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*tp = t->next;
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spin_unlock_bh(&ip6_tnl_lock);
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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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* ip6_tnl_create() - create a new tunnel
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* @p: tunnel parameters
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* @pt: pointer to new tunnel
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*
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* Description:
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* Create tunnel matching given parameters.
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*
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* Return:
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* created tunnel or NULL
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**/
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static struct ip6_tnl *ip6_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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struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
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if (p->name[0])
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strlcpy(name, p->name, IFNAMSIZ);
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else
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sprintf(name, "ip6tnl%%d");
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dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
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if (dev == NULL)
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goto failed;
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dev_net_set(dev, net);
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if (strchr(name, '%')) {
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if (dev_alloc_name(dev, name) < 0)
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goto failed_free;
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}
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t = netdev_priv(dev);
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t->parms = *p;
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ip6_tnl_dev_init(dev);
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if ((err = register_netdevice(dev)) < 0)
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goto failed_free;
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dev_hold(dev);
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ip6_tnl_link(ip6n, t);
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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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* ip6_tnl_locate - find or create tunnel matching given parameters
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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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* ip6_tnl_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 *ip6_tnl_locate(struct net *net,
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struct ip6_tnl_parm *p, int create)
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{
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struct in6_addr *remote = &p->raddr;
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struct in6_addr *local = &p->laddr;
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struct ip6_tnl *t;
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struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
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for (t = *ip6_tnl_bucket(ip6n, p); t; t = 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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return t;
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}
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if (!create)
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return NULL;
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return ip6_tnl_create(net, p);
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}
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/**
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* ip6_tnl_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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* ip6_tnl_dev_uninit() removes tunnel from its list
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**/
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static void
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ip6_tnl_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 net *net = dev_net(dev);
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struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
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if (dev == ip6n->fb_tnl_dev) {
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spin_lock_bh(&ip6_tnl_lock);
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ip6n->tnls_wc[0] = NULL;
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spin_unlock_bh(&ip6_tnl_lock);
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} else {
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ip6_tnl_unlink(ip6n, t);
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}
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ip6_tnl_dst_reset(t);
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dev_put(dev);
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}
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/**
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* parse_tvl_tnl_enc_lim - handle encapsulation limit option
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* @skb: received socket buffer
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*
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* Return:
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* 0 if none was found,
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* else index to encapsulation limit
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**/
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static __u16
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parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw)
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{
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struct ipv6hdr *ipv6h = (struct ipv6hdr *) raw;
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__u8 nexthdr = ipv6h->nexthdr;
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__u16 off = sizeof (*ipv6h);
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while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
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__u16 optlen = 0;
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struct ipv6_opt_hdr *hdr;
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if (raw + off + sizeof (*hdr) > skb->data &&
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!pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
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break;
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hdr = (struct ipv6_opt_hdr *) (raw + off);
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if (nexthdr == NEXTHDR_FRAGMENT) {
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struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
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if (frag_hdr->frag_off)
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break;
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optlen = 8;
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} else if (nexthdr == NEXTHDR_AUTH) {
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optlen = (hdr->hdrlen + 2) << 2;
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} else {
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optlen = ipv6_optlen(hdr);
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}
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if (nexthdr == NEXTHDR_DEST) {
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__u16 i = off + 2;
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while (1) {
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struct ipv6_tlv_tnl_enc_lim *tel;
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/* No more room for encapsulation limit */
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if (i + sizeof (*tel) > off + optlen)
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break;
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tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
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/* return index of option if found and valid */
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if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
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tel->length == 1)
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return i;
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/* else jump to next option */
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if (tel->type)
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i += tel->length + 2;
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else
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i++;
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}
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}
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nexthdr = hdr->nexthdr;
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off += optlen;
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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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* ip6_tnl_err - tunnel error handler
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*
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* Description:
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* ip6_tnl_err() should handle errors in the tunnel according
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* to the specifications in RFC 2473.
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**/
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static int
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ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
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u8 *type, u8 *code, int *msg, __u32 *info, int offset)
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{
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struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data;
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struct ip6_tnl *t;
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int rel_msg = 0;
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u8 rel_type = ICMPV6_DEST_UNREACH;
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u8 rel_code = ICMPV6_ADDR_UNREACH;
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__u32 rel_info = 0;
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__u16 len;
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int err = -ENOENT;
|
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|
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/* If the packet doesn't contain the original IPv6 header we are
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in trouble since we might need the source address for further
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processing of the error. */
|
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rcu_read_lock();
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if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
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&ipv6h->saddr)) == NULL)
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goto out;
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if (t->parms.proto != ipproto && t->parms.proto != 0)
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goto out;
|
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|
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err = 0;
|
|
|
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switch (*type) {
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__u32 teli;
|
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struct ipv6_tlv_tnl_enc_lim *tel;
|
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__u32 mtu;
|
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case ICMPV6_DEST_UNREACH:
|
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if (net_ratelimit())
|
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printk(KERN_WARNING
|
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"%s: Path to destination invalid "
|
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"or inactive!\n", t->parms.name);
|
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rel_msg = 1;
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break;
|
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case ICMPV6_TIME_EXCEED:
|
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if ((*code) == ICMPV6_EXC_HOPLIMIT) {
|
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if (net_ratelimit())
|
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printk(KERN_WARNING
|
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"%s: Too small hop limit or "
|
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"routing loop in tunnel!\n",
|
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t->parms.name);
|
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rel_msg = 1;
|
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}
|
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break;
|
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case ICMPV6_PARAMPROB:
|
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teli = 0;
|
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if ((*code) == ICMPV6_HDR_FIELD)
|
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teli = parse_tlv_tnl_enc_lim(skb, skb->data);
|
|
|
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if (teli && teli == *info - 2) {
|
|
tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
|
|
if (tel->encap_limit == 0) {
|
|
if (net_ratelimit())
|
|
printk(KERN_WARNING
|
|
"%s: Too small encapsulation "
|
|
"limit or routing loop in "
|
|
"tunnel!\n", t->parms.name);
|
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rel_msg = 1;
|
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}
|
|
} else if (net_ratelimit()) {
|
|
printk(KERN_WARNING
|
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"%s: Recipient unable to parse tunneled "
|
|
"packet!\n ", t->parms.name);
|
|
}
|
|
break;
|
|
case ICMPV6_PKT_TOOBIG:
|
|
mtu = *info - offset;
|
|
if (mtu < IPV6_MIN_MTU)
|
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mtu = IPV6_MIN_MTU;
|
|
t->dev->mtu = mtu;
|
|
|
|
if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
|
|
rel_type = ICMPV6_PKT_TOOBIG;
|
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rel_code = 0;
|
|
rel_info = mtu;
|
|
rel_msg = 1;
|
|
}
|
|
break;
|
|
}
|
|
|
|
*type = rel_type;
|
|
*code = rel_code;
|
|
*info = rel_info;
|
|
*msg = rel_msg;
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
|
|
u8 type, u8 code, int offset, __be32 info)
|
|
{
|
|
int rel_msg = 0;
|
|
u8 rel_type = type;
|
|
u8 rel_code = code;
|
|
__u32 rel_info = ntohl(info);
|
|
int err;
|
|
struct sk_buff *skb2;
|
|
struct iphdr *eiph;
|
|
struct flowi fl;
|
|
struct rtable *rt;
|
|
|
|
err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
|
|
&rel_msg, &rel_info, offset);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (rel_msg == 0)
|
|
return 0;
|
|
|
|
switch (rel_type) {
|
|
case ICMPV6_DEST_UNREACH:
|
|
if (rel_code != ICMPV6_ADDR_UNREACH)
|
|
return 0;
|
|
rel_type = ICMP_DEST_UNREACH;
|
|
rel_code = ICMP_HOST_UNREACH;
|
|
break;
|
|
case ICMPV6_PKT_TOOBIG:
|
|
if (rel_code != 0)
|
|
return 0;
|
|
rel_type = ICMP_DEST_UNREACH;
|
|
rel_code = ICMP_FRAG_NEEDED;
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
|
|
return 0;
|
|
|
|
skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
if (!skb2)
|
|
return 0;
|
|
|
|
skb_dst_drop(skb2);
|
|
|
|
skb_pull(skb2, offset);
|
|
skb_reset_network_header(skb2);
|
|
eiph = ip_hdr(skb2);
|
|
|
|
/* Try to guess incoming interface */
|
|
memset(&fl, 0, sizeof(fl));
|
|
fl.fl4_dst = eiph->saddr;
|
|
fl.fl4_tos = RT_TOS(eiph->tos);
|
|
fl.proto = IPPROTO_IPIP;
|
|
if (ip_route_output_key(dev_net(skb->dev), &rt, &fl))
|
|
goto out;
|
|
|
|
skb2->dev = rt->u.dst.dev;
|
|
|
|
/* route "incoming" packet */
|
|
if (rt->rt_flags & RTCF_LOCAL) {
|
|
ip_rt_put(rt);
|
|
rt = NULL;
|
|
fl.fl4_dst = eiph->daddr;
|
|
fl.fl4_src = eiph->saddr;
|
|
fl.fl4_tos = eiph->tos;
|
|
if (ip_route_output_key(dev_net(skb->dev), &rt, &fl) ||
|
|
rt->u.dst.dev->type != ARPHRD_TUNNEL) {
|
|
ip_rt_put(rt);
|
|
goto out;
|
|
}
|
|
skb_dst_set(skb2, (struct dst_entry *)rt);
|
|
} else {
|
|
ip_rt_put(rt);
|
|
if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
|
|
skb2->dev) ||
|
|
skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
|
|
goto out;
|
|
}
|
|
|
|
/* change mtu on this route */
|
|
if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
|
|
if (rel_info > dst_mtu(skb_dst(skb2)))
|
|
goto out;
|
|
|
|
skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info);
|
|
}
|
|
|
|
icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
|
|
|
|
out:
|
|
kfree_skb(skb2);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
|
|
u8 type, u8 code, int offset, __be32 info)
|
|
{
|
|
int rel_msg = 0;
|
|
u8 rel_type = type;
|
|
u8 rel_code = code;
|
|
__u32 rel_info = ntohl(info);
|
|
int err;
|
|
|
|
err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
|
|
&rel_msg, &rel_info, offset);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
|
|
struct rt6_info *rt;
|
|
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
|
|
if (!skb2)
|
|
return 0;
|
|
|
|
skb_dst_drop(skb2);
|
|
skb_pull(skb2, offset);
|
|
skb_reset_network_header(skb2);
|
|
|
|
/* Try to guess incoming interface */
|
|
rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
|
|
NULL, 0, 0);
|
|
|
|
if (rt && rt->rt6i_dev)
|
|
skb2->dev = rt->rt6i_dev;
|
|
|
|
icmpv6_send(skb2, rel_type, rel_code, rel_info);
|
|
|
|
if (rt)
|
|
dst_release(&rt->u.dst);
|
|
|
|
kfree_skb(skb2);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ip4ip6_dscp_ecn_decapsulate(struct ip6_tnl *t,
|
|
struct ipv6hdr *ipv6h,
|
|
struct sk_buff *skb)
|
|
{
|
|
__u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
|
|
|
|
if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
|
|
ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
|
|
|
|
if (INET_ECN_is_ce(dsfield))
|
|
IP_ECN_set_ce(ip_hdr(skb));
|
|
}
|
|
|
|
static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t,
|
|
struct ipv6hdr *ipv6h,
|
|
struct sk_buff *skb)
|
|
{
|
|
if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
|
|
ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
|
|
|
|
if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h)))
|
|
IP6_ECN_set_ce(ipv6_hdr(skb));
|
|
}
|
|
|
|
/* called with rcu_read_lock() */
|
|
static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t)
|
|
{
|
|
struct ip6_tnl_parm *p = &t->parms;
|
|
int ret = 0;
|
|
struct net *net = dev_net(t->dev);
|
|
|
|
if (p->flags & IP6_TNL_F_CAP_RCV) {
|
|
struct net_device *ldev = NULL;
|
|
|
|
if (p->link)
|
|
ldev = dev_get_by_index_rcu(net, p->link);
|
|
|
|
if ((ipv6_addr_is_multicast(&p->laddr) ||
|
|
likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) &&
|
|
likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0)))
|
|
ret = 1;
|
|
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
|
|
* @skb: received socket buffer
|
|
* @protocol: ethernet protocol ID
|
|
* @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
|
|
*
|
|
* Return: 0
|
|
**/
|
|
|
|
static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
|
|
__u8 ipproto,
|
|
void (*dscp_ecn_decapsulate)(struct ip6_tnl *t,
|
|
struct ipv6hdr *ipv6h,
|
|
struct sk_buff *skb))
|
|
{
|
|
struct ip6_tnl *t;
|
|
struct ipv6hdr *ipv6h = ipv6_hdr(skb);
|
|
|
|
rcu_read_lock();
|
|
|
|
if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
|
|
&ipv6h->daddr)) != NULL) {
|
|
if (t->parms.proto != ipproto && t->parms.proto != 0) {
|
|
rcu_read_unlock();
|
|
goto discard;
|
|
}
|
|
|
|
if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
|
|
rcu_read_unlock();
|
|
goto discard;
|
|
}
|
|
|
|
if (!ip6_tnl_rcv_ctl(t)) {
|
|
t->dev->stats.rx_dropped++;
|
|
rcu_read_unlock();
|
|
goto discard;
|
|
}
|
|
secpath_reset(skb);
|
|
skb->mac_header = skb->network_header;
|
|
skb_reset_network_header(skb);
|
|
skb->protocol = htons(protocol);
|
|
skb->pkt_type = PACKET_HOST;
|
|
memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
|
|
skb->dev = t->dev;
|
|
skb_dst_drop(skb);
|
|
nf_reset(skb);
|
|
|
|
dscp_ecn_decapsulate(t, ipv6h, skb);
|
|
|
|
t->dev->stats.rx_packets++;
|
|
t->dev->stats.rx_bytes += skb->len;
|
|
netif_rx(skb);
|
|
rcu_read_unlock();
|
|
return 0;
|
|
}
|
|
rcu_read_unlock();
|
|
return 1;
|
|
|
|
discard:
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int ip4ip6_rcv(struct sk_buff *skb)
|
|
{
|
|
return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
|
|
ip4ip6_dscp_ecn_decapsulate);
|
|
}
|
|
|
|
static int ip6ip6_rcv(struct sk_buff *skb)
|
|
{
|
|
return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
|
|
ip6ip6_dscp_ecn_decapsulate);
|
|
}
|
|
|
|
struct ipv6_tel_txoption {
|
|
struct ipv6_txoptions ops;
|
|
__u8 dst_opt[8];
|
|
};
|
|
|
|
static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
|
|
{
|
|
memset(opt, 0, sizeof(struct ipv6_tel_txoption));
|
|
|
|
opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
|
|
opt->dst_opt[3] = 1;
|
|
opt->dst_opt[4] = encap_limit;
|
|
opt->dst_opt[5] = IPV6_TLV_PADN;
|
|
opt->dst_opt[6] = 1;
|
|
|
|
opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
|
|
opt->ops.opt_nflen = 8;
|
|
}
|
|
|
|
/**
|
|
* ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
|
|
* @t: the outgoing tunnel device
|
|
* @hdr: IPv6 header from the incoming packet
|
|
*
|
|
* 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 int
|
|
ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr)
|
|
{
|
|
return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
|
|
}
|
|
|
|
static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
|
|
{
|
|
struct ip6_tnl_parm *p = &t->parms;
|
|
int ret = 0;
|
|
struct net *net = dev_net(t->dev);
|
|
|
|
if (p->flags & IP6_TNL_F_CAP_XMIT) {
|
|
struct net_device *ldev = NULL;
|
|
|
|
rcu_read_lock();
|
|
if (p->link)
|
|
ldev = dev_get_by_index_rcu(net, p->link);
|
|
|
|
if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
|
|
printk(KERN_WARNING
|
|
"%s xmit: Local address not yet configured!\n",
|
|
p->name);
|
|
else if (!ipv6_addr_is_multicast(&p->raddr) &&
|
|
unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
|
|
printk(KERN_WARNING
|
|
"%s xmit: Routing loop! "
|
|
"Remote address found on this node!\n",
|
|
p->name);
|
|
else
|
|
ret = 1;
|
|
rcu_read_unlock();
|
|
}
|
|
return ret;
|
|
}
|
|
/**
|
|
* ip6_tnl_xmit2 - encapsulate packet and send
|
|
* @skb: the outgoing socket buffer
|
|
* @dev: the outgoing tunnel device
|
|
* @dsfield: dscp code for outer header
|
|
* @fl: flow of tunneled packet
|
|
* @encap_limit: encapsulation limit
|
|
* @pmtu: Path MTU is stored if packet is too big
|
|
*
|
|
* Description:
|
|
* Build new header and do some sanity checks on the packet before sending
|
|
* it.
|
|
*
|
|
* Return:
|
|
* 0 on success
|
|
* -1 fail
|
|
* %-EMSGSIZE message too big. return mtu in this case.
|
|
**/
|
|
|
|
static int ip6_tnl_xmit2(struct sk_buff *skb,
|
|
struct net_device *dev,
|
|
__u8 dsfield,
|
|
struct flowi *fl,
|
|
int encap_limit,
|
|
__u32 *pmtu)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
struct net_device_stats *stats = &t->dev->stats;
|
|
struct ipv6hdr *ipv6h = ipv6_hdr(skb);
|
|
struct ipv6_tel_txoption opt;
|
|
struct dst_entry *dst;
|
|
struct net_device *tdev;
|
|
int mtu;
|
|
unsigned int max_headroom = sizeof(struct ipv6hdr);
|
|
u8 proto;
|
|
int err = -1;
|
|
int pkt_len;
|
|
|
|
if ((dst = ip6_tnl_dst_check(t)) != NULL)
|
|
dst_hold(dst);
|
|
else {
|
|
dst = ip6_route_output(net, NULL, fl);
|
|
|
|
if (dst->error || xfrm_lookup(net, &dst, fl, NULL, 0) < 0)
|
|
goto tx_err_link_failure;
|
|
}
|
|
|
|
tdev = dst->dev;
|
|
|
|
if (tdev == dev) {
|
|
stats->collisions++;
|
|
if (net_ratelimit())
|
|
printk(KERN_WARNING
|
|
"%s: Local routing loop detected!\n",
|
|
t->parms.name);
|
|
goto tx_err_dst_release;
|
|
}
|
|
mtu = dst_mtu(dst) - sizeof (*ipv6h);
|
|
if (encap_limit >= 0) {
|
|
max_headroom += 8;
|
|
mtu -= 8;
|
|
}
|
|
if (mtu < IPV6_MIN_MTU)
|
|
mtu = IPV6_MIN_MTU;
|
|
if (skb_dst(skb))
|
|
skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
|
|
if (skb->len > mtu) {
|
|
*pmtu = mtu;
|
|
err = -EMSGSIZE;
|
|
goto tx_err_dst_release;
|
|
}
|
|
|
|
/*
|
|
* Okay, now see if we can stuff it in the buffer as-is.
|
|
*/
|
|
max_headroom += LL_RESERVED_SPACE(tdev);
|
|
|
|
if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
|
|
(skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
|
|
struct sk_buff *new_skb;
|
|
|
|
if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
|
|
goto tx_err_dst_release;
|
|
|
|
if (skb->sk)
|
|
skb_set_owner_w(new_skb, skb->sk);
|
|
kfree_skb(skb);
|
|
skb = new_skb;
|
|
}
|
|
skb_dst_drop(skb);
|
|
skb_dst_set(skb, dst_clone(dst));
|
|
|
|
skb->transport_header = skb->network_header;
|
|
|
|
proto = fl->proto;
|
|
if (encap_limit >= 0) {
|
|
init_tel_txopt(&opt, encap_limit);
|
|
ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
|
|
}
|
|
skb_push(skb, sizeof(struct ipv6hdr));
|
|
skb_reset_network_header(skb);
|
|
ipv6h = ipv6_hdr(skb);
|
|
*(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000);
|
|
dsfield = INET_ECN_encapsulate(0, dsfield);
|
|
ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
|
|
ipv6h->hop_limit = t->parms.hop_limit;
|
|
ipv6h->nexthdr = proto;
|
|
ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src);
|
|
ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst);
|
|
nf_reset(skb);
|
|
pkt_len = skb->len;
|
|
err = ip6_local_out(skb);
|
|
|
|
if (net_xmit_eval(err) == 0) {
|
|
stats->tx_bytes += pkt_len;
|
|
stats->tx_packets++;
|
|
} else {
|
|
stats->tx_errors++;
|
|
stats->tx_aborted_errors++;
|
|
}
|
|
ip6_tnl_dst_store(t, dst);
|
|
return 0;
|
|
tx_err_link_failure:
|
|
stats->tx_carrier_errors++;
|
|
dst_link_failure(skb);
|
|
tx_err_dst_release:
|
|
dst_release(dst);
|
|
return err;
|
|
}
|
|
|
|
static inline int
|
|
ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
struct iphdr *iph = ip_hdr(skb);
|
|
int encap_limit = -1;
|
|
struct flowi fl;
|
|
__u8 dsfield;
|
|
__u32 mtu;
|
|
int err;
|
|
|
|
if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
|
|
!ip6_tnl_xmit_ctl(t))
|
|
return -1;
|
|
|
|
if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
|
|
encap_limit = t->parms.encap_limit;
|
|
|
|
memcpy(&fl, &t->fl, sizeof (fl));
|
|
fl.proto = IPPROTO_IPIP;
|
|
|
|
dsfield = ipv4_get_dsfield(iph);
|
|
|
|
if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
|
|
fl.fl6_flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
|
|
& IPV6_TCLASS_MASK;
|
|
|
|
err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu);
|
|
if (err != 0) {
|
|
/* XXX: send ICMP error even if DF is not set. */
|
|
if (err == -EMSGSIZE)
|
|
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
|
|
htonl(mtu));
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
struct ipv6hdr *ipv6h = ipv6_hdr(skb);
|
|
int encap_limit = -1;
|
|
__u16 offset;
|
|
struct flowi fl;
|
|
__u8 dsfield;
|
|
__u32 mtu;
|
|
int err;
|
|
|
|
if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
|
|
!ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
|
|
return -1;
|
|
|
|
offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb));
|
|
if (offset > 0) {
|
|
struct ipv6_tlv_tnl_enc_lim *tel;
|
|
tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
|
|
if (tel->encap_limit == 0) {
|
|
icmpv6_send(skb, ICMPV6_PARAMPROB,
|
|
ICMPV6_HDR_FIELD, offset + 2);
|
|
return -1;
|
|
}
|
|
encap_limit = tel->encap_limit - 1;
|
|
} else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
|
|
encap_limit = t->parms.encap_limit;
|
|
|
|
memcpy(&fl, &t->fl, sizeof (fl));
|
|
fl.proto = IPPROTO_IPV6;
|
|
|
|
dsfield = ipv6_get_dsfield(ipv6h);
|
|
if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
|
|
fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
|
|
if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL))
|
|
fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
|
|
|
|
err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu);
|
|
if (err != 0) {
|
|
if (err == -EMSGSIZE)
|
|
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static netdev_tx_t
|
|
ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
struct net_device_stats *stats = &t->dev->stats;
|
|
int ret;
|
|
|
|
switch (skb->protocol) {
|
|
case htons(ETH_P_IP):
|
|
ret = ip4ip6_tnl_xmit(skb, dev);
|
|
break;
|
|
case htons(ETH_P_IPV6):
|
|
ret = ip6ip6_tnl_xmit(skb, dev);
|
|
break;
|
|
default:
|
|
goto tx_err;
|
|
}
|
|
|
|
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 void ip6_tnl_set_cap(struct ip6_tnl *t)
|
|
{
|
|
struct ip6_tnl_parm *p = &t->parms;
|
|
int ltype = ipv6_addr_type(&p->laddr);
|
|
int rtype = ipv6_addr_type(&p->raddr);
|
|
|
|
p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV);
|
|
|
|
if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
|
|
rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
|
|
!((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
|
|
(!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
|
|
if (ltype&IPV6_ADDR_UNICAST)
|
|
p->flags |= IP6_TNL_F_CAP_XMIT;
|
|
if (rtype&IPV6_ADDR_UNICAST)
|
|
p->flags |= IP6_TNL_F_CAP_RCV;
|
|
}
|
|
}
|
|
|
|
static void ip6_tnl_link_config(struct ip6_tnl *t)
|
|
{
|
|
struct net_device *dev = t->dev;
|
|
struct ip6_tnl_parm *p = &t->parms;
|
|
struct flowi *fl = &t->fl;
|
|
|
|
memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
|
|
memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
|
|
|
|
/* Set up flowi template */
|
|
ipv6_addr_copy(&fl->fl6_src, &p->laddr);
|
|
ipv6_addr_copy(&fl->fl6_dst, &p->raddr);
|
|
fl->oif = p->link;
|
|
fl->fl6_flowlabel = 0;
|
|
|
|
if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
|
|
fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
|
|
if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
|
|
fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
|
|
|
|
ip6_tnl_set_cap(t);
|
|
|
|
if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
|
|
dev->flags |= IFF_POINTOPOINT;
|
|
else
|
|
dev->flags &= ~IFF_POINTOPOINT;
|
|
|
|
dev->iflink = p->link;
|
|
|
|
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(dev_net(dev),
|
|
&p->raddr, &p->laddr,
|
|
p->link, strict);
|
|
|
|
if (rt == NULL)
|
|
return;
|
|
|
|
if (rt->rt6i_dev) {
|
|
dev->hard_header_len = rt->rt6i_dev->hard_header_len +
|
|
sizeof (struct ipv6hdr);
|
|
|
|
dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr);
|
|
|
|
if (dev->mtu < IPV6_MIN_MTU)
|
|
dev->mtu = IPV6_MIN_MTU;
|
|
}
|
|
dst_release(&rt->u.dst);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ip6_tnl_change - update the tunnel parameters
|
|
* @t: tunnel to be changed
|
|
* @p: tunnel configuration parameters
|
|
*
|
|
* Description:
|
|
* ip6_tnl_change() updates the tunnel parameters
|
|
**/
|
|
|
|
static int
|
|
ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p)
|
|
{
|
|
ipv6_addr_copy(&t->parms.laddr, &p->laddr);
|
|
ipv6_addr_copy(&t->parms.raddr, &p->raddr);
|
|
t->parms.flags = p->flags;
|
|
t->parms.hop_limit = p->hop_limit;
|
|
t->parms.encap_limit = p->encap_limit;
|
|
t->parms.flowinfo = p->flowinfo;
|
|
t->parms.link = p->link;
|
|
t->parms.proto = p->proto;
|
|
ip6_tnl_dst_reset(t);
|
|
ip6_tnl_link_config(t);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ip6_tnl_ioctl - configure ipv6 tunnels from userspace
|
|
* @dev: virtual device associated with tunnel
|
|
* @ifr: parameters passed from userspace
|
|
* @cmd: command to be performed
|
|
*
|
|
* Description:
|
|
* ip6_tnl_ioctl() is used for managing IPv6 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 "ip6tnl0", 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
|
|
ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
|
|
{
|
|
int err = 0;
|
|
struct ip6_tnl_parm p;
|
|
struct ip6_tnl *t = NULL;
|
|
struct net *net = dev_net(dev);
|
|
struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_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;
|
|
}
|
|
t = ip6_tnl_locate(net, &p, 0);
|
|
}
|
|
if (t == NULL)
|
|
t = netdev_priv(dev);
|
|
memcpy(&p, &t->parms, sizeof (p));
|
|
if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
|
|
err = -EFAULT;
|
|
}
|
|
break;
|
|
case SIOCADDTUNNEL:
|
|
case SIOCCHGTUNNEL:
|
|
err = -EPERM;
|
|
if (!capable(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 != IPPROTO_IPIP &&
|
|
p.proto != 0)
|
|
break;
|
|
t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL);
|
|
if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
|
|
if (t != NULL) {
|
|
if (t->dev != dev) {
|
|
err = -EEXIST;
|
|
break;
|
|
}
|
|
} else
|
|
t = netdev_priv(dev);
|
|
|
|
ip6_tnl_unlink(ip6n, t);
|
|
err = ip6_tnl_change(t, &p);
|
|
ip6_tnl_link(ip6n, t);
|
|
netdev_state_change(dev);
|
|
}
|
|
if (t) {
|
|
err = 0;
|
|
if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p)))
|
|
err = -EFAULT;
|
|
|
|
} else
|
|
err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
|
|
break;
|
|
case SIOCDELTUNNEL:
|
|
err = -EPERM;
|
|
if (!capable(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;
|
|
if ((t = ip6_tnl_locate(net, &p, 0)) == NULL)
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* ip6_tnl_change_mtu - change mtu manually for tunnel device
|
|
* @dev: virtual device associated with tunnel
|
|
* @new_mtu: the new mtu
|
|
*
|
|
* Return:
|
|
* 0 on success,
|
|
* %-EINVAL if mtu too small
|
|
**/
|
|
|
|
static int
|
|
ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
if (new_mtu < IPV6_MIN_MTU) {
|
|
return -EINVAL;
|
|
}
|
|
dev->mtu = new_mtu;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static const struct net_device_ops ip6_tnl_netdev_ops = {
|
|
.ndo_uninit = ip6_tnl_dev_uninit,
|
|
.ndo_start_xmit = ip6_tnl_xmit,
|
|
.ndo_do_ioctl = ip6_tnl_ioctl,
|
|
.ndo_change_mtu = ip6_tnl_change_mtu,
|
|
};
|
|
|
|
/**
|
|
* ip6_tnl_dev_setup - setup virtual tunnel device
|
|
* @dev: virtual device associated with tunnel
|
|
*
|
|
* Description:
|
|
* Initialize function pointers and device parameters
|
|
**/
|
|
|
|
static void ip6_tnl_dev_setup(struct net_device *dev)
|
|
{
|
|
dev->netdev_ops = &ip6_tnl_netdev_ops;
|
|
dev->destructor = free_netdev;
|
|
|
|
dev->type = ARPHRD_TUNNEL6;
|
|
dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
|
|
dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
|
|
dev->flags |= IFF_NOARP;
|
|
dev->addr_len = sizeof(struct in6_addr);
|
|
dev->features |= NETIF_F_NETNS_LOCAL;
|
|
}
|
|
|
|
|
|
/**
|
|
* ip6_tnl_dev_init_gen - general initializer for all tunnel devices
|
|
* @dev: virtual device associated with tunnel
|
|
**/
|
|
|
|
static inline void
|
|
ip6_tnl_dev_init_gen(struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
t->dev = dev;
|
|
strcpy(t->parms.name, dev->name);
|
|
}
|
|
|
|
/**
|
|
* ip6_tnl_dev_init - initializer for all non fallback tunnel devices
|
|
* @dev: virtual device associated with tunnel
|
|
**/
|
|
|
|
static void ip6_tnl_dev_init(struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
ip6_tnl_dev_init_gen(dev);
|
|
ip6_tnl_link_config(t);
|
|
}
|
|
|
|
/**
|
|
* ip6_fb_tnl_dev_init - initializer for fallback tunnel device
|
|
* @dev: fallback device
|
|
*
|
|
* Return: 0
|
|
**/
|
|
|
|
static void __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
struct net *net = dev_net(dev);
|
|
struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
|
|
|
|
ip6_tnl_dev_init_gen(dev);
|
|
t->parms.proto = IPPROTO_IPV6;
|
|
dev_hold(dev);
|
|
ip6n->tnls_wc[0] = t;
|
|
}
|
|
|
|
static struct xfrm6_tunnel ip4ip6_handler = {
|
|
.handler = ip4ip6_rcv,
|
|
.err_handler = ip4ip6_err,
|
|
.priority = 1,
|
|
};
|
|
|
|
static struct xfrm6_tunnel ip6ip6_handler = {
|
|
.handler = ip6ip6_rcv,
|
|
.err_handler = ip6ip6_err,
|
|
.priority = 1,
|
|
};
|
|
|
|
static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n)
|
|
{
|
|
int h;
|
|
struct ip6_tnl *t;
|
|
LIST_HEAD(list);
|
|
|
|
for (h = 0; h < HASH_SIZE; h++) {
|
|
t = ip6n->tnls_r_l[h];
|
|
while (t != NULL) {
|
|
unregister_netdevice_queue(t->dev, &list);
|
|
t = t->next;
|
|
}
|
|
}
|
|
|
|
t = ip6n->tnls_wc[0];
|
|
unregister_netdevice_queue(t->dev, &list);
|
|
unregister_netdevice_many(&list);
|
|
}
|
|
|
|
static int __net_init ip6_tnl_init_net(struct net *net)
|
|
{
|
|
struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
|
|
int err;
|
|
|
|
ip6n->tnls[0] = ip6n->tnls_wc;
|
|
ip6n->tnls[1] = ip6n->tnls_r_l;
|
|
|
|
err = -ENOMEM;
|
|
ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
|
|
ip6_tnl_dev_setup);
|
|
|
|
if (!ip6n->fb_tnl_dev)
|
|
goto err_alloc_dev;
|
|
dev_net_set(ip6n->fb_tnl_dev, net);
|
|
|
|
ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
|
|
|
|
err = register_netdev(ip6n->fb_tnl_dev);
|
|
if (err < 0)
|
|
goto err_register;
|
|
return 0;
|
|
|
|
err_register:
|
|
free_netdev(ip6n->fb_tnl_dev);
|
|
err_alloc_dev:
|
|
return err;
|
|
}
|
|
|
|
static void __net_exit ip6_tnl_exit_net(struct net *net)
|
|
{
|
|
struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
|
|
|
|
rtnl_lock();
|
|
ip6_tnl_destroy_tunnels(ip6n);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static struct pernet_operations ip6_tnl_net_ops = {
|
|
.init = ip6_tnl_init_net,
|
|
.exit = ip6_tnl_exit_net,
|
|
.id = &ip6_tnl_net_id,
|
|
.size = sizeof(struct ip6_tnl_net),
|
|
};
|
|
|
|
/**
|
|
* ip6_tunnel_init - register protocol and reserve needed resources
|
|
*
|
|
* Return: 0 on success
|
|
**/
|
|
|
|
static int __init ip6_tunnel_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = register_pernet_device(&ip6_tnl_net_ops);
|
|
if (err < 0)
|
|
goto out_pernet;
|
|
|
|
err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
|
|
if (err < 0) {
|
|
printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n");
|
|
goto out_ip4ip6;
|
|
}
|
|
|
|
err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
|
|
if (err < 0) {
|
|
printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n");
|
|
goto out_ip6ip6;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_ip6ip6:
|
|
xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
|
|
out_ip4ip6:
|
|
unregister_pernet_device(&ip6_tnl_net_ops);
|
|
out_pernet:
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* ip6_tunnel_cleanup - free resources and unregister protocol
|
|
**/
|
|
|
|
static void __exit ip6_tunnel_cleanup(void)
|
|
{
|
|
if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
|
|
printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n");
|
|
|
|
if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
|
|
printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n");
|
|
|
|
unregister_pernet_device(&ip6_tnl_net_ops);
|
|
}
|
|
|
|
module_init(ip6_tunnel_init);
|
|
module_exit(ip6_tunnel_cleanup);
|