![Ken-ichirou MATSUZAWA](/assets/img/avatar_default.png)
From: Ken-ichirou MATSUZAWA <chamas@h4.dion.ne.jp> Signed-off-by: David S. Miller <davem@davemloft.net>
1193 lines
27 KiB
C
1193 lines
27 KiB
C
/*
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* IPv6 over IPv6 tunnel 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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*
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* $Id$
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*
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* Based on:
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* linux/net/ipv6/sit.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/config.h>
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#include <linux/module.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/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/ip.h>
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#include <net/ipv6.h>
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#include <net/protocol.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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MODULE_AUTHOR("Ville Nuorvala");
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MODULE_DESCRIPTION("IPv6-in-IPv6 tunnel");
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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", __FUNCTION__)
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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 HASH_SIZE 32
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#define HASH(addr) (((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 int ip6ip6_fb_tnl_dev_init(struct net_device *dev);
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static int ip6ip6_tnl_dev_init(struct net_device *dev);
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static void ip6ip6_tnl_dev_setup(struct net_device *dev);
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/* the IPv6 tunnel fallback device */
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static struct net_device *ip6ip6_fb_tnl_dev;
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/* lists for storing tunnels in use */
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static struct ip6_tnl *tnls_r_l[HASH_SIZE];
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static struct ip6_tnl *tnls_wc[1];
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static struct ip6_tnl **tnls[2] = { tnls_wc, tnls_r_l };
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/* lock for the tunnel lists */
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static DEFINE_RWLOCK(ip6ip6_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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* ip6ip6_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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static struct ip6_tnl *
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ip6ip6_tnl_lookup(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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for (t = tnls_r_l[h0 ^ h1]; 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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(t->dev->flags & IFF_UP))
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return t;
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}
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if ((t = tnls_wc[0]) != NULL && (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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* ip6ip6_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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* ip6ip6_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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ip6ip6_bucket(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 &tnls[prio][h];
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}
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/**
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* ip6ip6_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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ip6ip6_tnl_link(struct ip6_tnl *t)
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{
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struct ip6_tnl **tp = ip6ip6_bucket(&t->parms);
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t->next = *tp;
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write_lock_bh(&ip6ip6_lock);
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*tp = t;
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write_unlock_bh(&ip6ip6_lock);
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}
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/**
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* ip6ip6_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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ip6ip6_tnl_unlink(struct ip6_tnl *t)
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{
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struct ip6_tnl **tp;
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for (tp = ip6ip6_bucket(&t->parms); *tp; tp = &(*tp)->next) {
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if (t == *tp) {
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write_lock_bh(&ip6ip6_lock);
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*tp = t->next;
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write_unlock_bh(&ip6ip6_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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* 0 on success
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**/
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static int
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ip6_tnl_create(struct ip6_tnl_parm *p, struct ip6_tnl **pt)
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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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strlcpy(name, p->name, IFNAMSIZ);
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} else {
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int i;
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for (i = 1; i < IP6_TNL_MAX; i++) {
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sprintf(name, "ip6tnl%d", i);
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if (__dev_get_by_name(name) == NULL)
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break;
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}
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if (i == IP6_TNL_MAX)
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return -ENOBUFS;
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}
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dev = alloc_netdev(sizeof (*t), name, ip6ip6_tnl_dev_setup);
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if (dev == NULL)
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return -ENOMEM;
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t = dev->priv;
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dev->init = ip6ip6_tnl_dev_init;
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t->parms = *p;
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if ((err = register_netdevice(dev)) < 0) {
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free_netdev(dev);
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return err;
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}
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dev_hold(dev);
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ip6ip6_tnl_link(t);
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*pt = t;
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return 0;
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}
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/**
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* ip6ip6_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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* ip6ip6_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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* 0 if tunnel located or created,
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* -EINVAL if parameters incorrect,
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* -ENODEV if no matching tunnel available
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**/
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static int
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ip6ip6_tnl_locate(struct ip6_tnl_parm *p, struct ip6_tnl **pt, 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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if (p->proto != IPPROTO_IPV6)
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return -EINVAL;
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for (t = *ip6ip6_bucket(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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*pt = t;
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return (create ? -EEXIST : 0);
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}
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}
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if (!create)
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return -ENODEV;
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return ip6_tnl_create(p, pt);
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}
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/**
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* ip6ip6_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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* ip6ip6_tnl_dev_uninit() removes tunnel from its list
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**/
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static void
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ip6ip6_tnl_dev_uninit(struct net_device *dev)
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{
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struct ip6_tnl *t = dev->priv;
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if (dev == ip6ip6_fb_tnl_dev) {
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write_lock_bh(&ip6ip6_lock);
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tnls_wc[0] = NULL;
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write_unlock_bh(&ip6ip6_lock);
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} else {
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ip6ip6_tnl_unlink(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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* ip6ip6_err - tunnel error handler
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*
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* Description:
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* ip6ip6_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 void
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ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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int type, int code, int offset, __u32 info)
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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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int rel_type = ICMPV6_DEST_UNREACH;
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int rel_code = ICMPV6_ADDR_UNREACH;
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__u32 rel_info = 0;
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__u16 len;
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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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read_lock(&ip6ip6_lock);
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if ((t = ip6ip6_tnl_lookup(&ipv6h->daddr, &ipv6h->saddr)) == NULL)
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goto out;
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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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/* ignore if parameter problem not caused by a tunnel
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encapsulation limit sub-option */
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if (code != ICMPV6_HDR_FIELD) {
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break;
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}
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teli = parse_tlv_tnl_enc_lim(skb, skb->data);
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|
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if (teli && teli == ntohl(info) - 2) {
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tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
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if (tel->encap_limit == 0) {
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if (net_ratelimit())
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printk(KERN_WARNING
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"%s: Too small encapsulation "
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"limit or routing loop in "
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"tunnel!\n", t->parms.name);
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rel_msg = 1;
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}
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}
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break;
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case ICMPV6_PKT_TOOBIG:
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mtu = ntohl(info) - offset;
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if (mtu < IPV6_MIN_MTU)
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mtu = IPV6_MIN_MTU;
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t->dev->mtu = mtu;
|
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|
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if ((len = sizeof (*ipv6h) + ipv6h->payload_len) > mtu) {
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rel_type = ICMPV6_PKT_TOOBIG;
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rel_code = 0;
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rel_info = mtu;
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rel_msg = 1;
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}
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break;
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}
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if (rel_msg && pskb_may_pull(skb, offset + sizeof (*ipv6h))) {
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struct rt6_info *rt;
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struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
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if (!skb2)
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goto out;
|
|
|
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dst_release(skb2->dst);
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skb2->dst = NULL;
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skb_pull(skb2, offset);
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skb2->nh.raw = skb2->data;
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|
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/* Try to guess incoming interface */
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rt = rt6_lookup(&skb2->nh.ipv6h->saddr, NULL, 0, 0);
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|
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if (rt && rt->rt6i_dev)
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skb2->dev = rt->rt6i_dev;
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icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev);
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|
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if (rt)
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dst_release(&rt->u.dst);
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|
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kfree_skb(skb2);
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}
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|
out:
|
|
read_unlock(&ip6ip6_lock);
|
|
}
|
|
|
|
static inline void ip6ip6_ecn_decapsulate(struct ipv6hdr *outer_iph,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct ipv6hdr *inner_iph = skb->nh.ipv6h;
|
|
|
|
if (INET_ECN_is_ce(ipv6_get_dsfield(outer_iph)))
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IP6_ECN_set_ce(inner_iph);
|
|
}
|
|
|
|
/**
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* ip6ip6_rcv - decapsulate IPv6 packet and retransmit it locally
|
|
* @skb: received socket buffer
|
|
*
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* Return: 0
|
|
**/
|
|
|
|
static int
|
|
ip6ip6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
|
|
{
|
|
struct sk_buff *skb = *pskb;
|
|
struct ipv6hdr *ipv6h;
|
|
struct ip6_tnl *t;
|
|
|
|
if (!pskb_may_pull(skb, sizeof (*ipv6h)))
|
|
goto discard;
|
|
|
|
ipv6h = skb->nh.ipv6h;
|
|
|
|
read_lock(&ip6ip6_lock);
|
|
|
|
if ((t = ip6ip6_tnl_lookup(&ipv6h->saddr, &ipv6h->daddr)) != NULL) {
|
|
if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
|
|
read_unlock(&ip6ip6_lock);
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
if (!(t->parms.flags & IP6_TNL_F_CAP_RCV)) {
|
|
t->stat.rx_dropped++;
|
|
read_unlock(&ip6ip6_lock);
|
|
goto discard;
|
|
}
|
|
secpath_reset(skb);
|
|
skb->mac.raw = skb->nh.raw;
|
|
skb->nh.raw = skb->data;
|
|
skb->protocol = htons(ETH_P_IPV6);
|
|
skb->pkt_type = PACKET_HOST;
|
|
memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
|
|
skb->dev = t->dev;
|
|
dst_release(skb->dst);
|
|
skb->dst = NULL;
|
|
if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
|
|
ipv6_copy_dscp(ipv6h, skb->nh.ipv6h);
|
|
ip6ip6_ecn_decapsulate(ipv6h, skb);
|
|
t->stat.rx_packets++;
|
|
t->stat.rx_bytes += skb->len;
|
|
netif_rx(skb);
|
|
read_unlock(&ip6ip6_lock);
|
|
return 0;
|
|
}
|
|
read_unlock(&ip6ip6_lock);
|
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev);
|
|
discard:
|
|
return 1;
|
|
}
|
|
|
|
static inline struct ipv6_txoptions *create_tel(__u8 encap_limit)
|
|
{
|
|
struct ipv6_tlv_tnl_enc_lim *tel;
|
|
struct ipv6_txoptions *opt;
|
|
__u8 *raw;
|
|
|
|
int opt_len = sizeof(*opt) + 8;
|
|
|
|
if (!(opt = kmalloc(opt_len, GFP_ATOMIC))) {
|
|
return NULL;
|
|
}
|
|
memset(opt, 0, opt_len);
|
|
opt->tot_len = opt_len;
|
|
opt->dst0opt = (struct ipv6_opt_hdr *) (opt + 1);
|
|
opt->opt_nflen = 8;
|
|
|
|
tel = (struct ipv6_tlv_tnl_enc_lim *) (opt->dst0opt + 1);
|
|
tel->type = IPV6_TLV_TNL_ENCAP_LIMIT;
|
|
tel->length = 1;
|
|
tel->encap_limit = encap_limit;
|
|
|
|
raw = (__u8 *) opt->dst0opt;
|
|
raw[5] = IPV6_TLV_PADN;
|
|
raw[6] = 1;
|
|
|
|
return opt;
|
|
}
|
|
|
|
/**
|
|
* ip6ip6_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
|
|
ip6ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr)
|
|
{
|
|
return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
|
|
}
|
|
|
|
/**
|
|
* ip6ip6_tnl_xmit - encapsulate packet and send
|
|
* @skb: the outgoing socket buffer
|
|
* @dev: the outgoing tunnel device
|
|
*
|
|
* Description:
|
|
* Build new header and do some sanity checks on the packet before sending
|
|
* it.
|
|
*
|
|
* Return:
|
|
* 0
|
|
**/
|
|
|
|
static int
|
|
ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = (struct ip6_tnl *) dev->priv;
|
|
struct net_device_stats *stats = &t->stat;
|
|
struct ipv6hdr *ipv6h = skb->nh.ipv6h;
|
|
struct ipv6_txoptions *opt = NULL;
|
|
int encap_limit = -1;
|
|
__u16 offset;
|
|
struct flowi fl;
|
|
struct dst_entry *dst;
|
|
struct net_device *tdev;
|
|
int mtu;
|
|
int max_headroom = sizeof(struct ipv6hdr);
|
|
u8 proto;
|
|
int err;
|
|
int pkt_len;
|
|
int dsfield;
|
|
|
|
if (t->recursion++) {
|
|
stats->collisions++;
|
|
goto tx_err;
|
|
}
|
|
if (skb->protocol != htons(ETH_P_IPV6) ||
|
|
!(t->parms.flags & IP6_TNL_F_CAP_XMIT) ||
|
|
ip6ip6_tnl_addr_conflict(t, ipv6h)) {
|
|
goto tx_err;
|
|
}
|
|
if ((offset = parse_tlv_tnl_enc_lim(skb, skb->nh.raw)) > 0) {
|
|
struct ipv6_tlv_tnl_enc_lim *tel;
|
|
tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->nh.raw[offset];
|
|
if (tel->encap_limit == 0) {
|
|
icmpv6_send(skb, ICMPV6_PARAMPROB,
|
|
ICMPV6_HDR_FIELD, offset + 2, skb->dev);
|
|
goto tx_err;
|
|
}
|
|
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));
|
|
proto = fl.proto;
|
|
|
|
dsfield = ipv6_get_dsfield(ipv6h);
|
|
if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
|
|
fl.fl6_flowlabel |= (*(__u32 *) ipv6h & IPV6_TCLASS_MASK);
|
|
if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL))
|
|
fl.fl6_flowlabel |= (*(__u32 *) ipv6h & IPV6_FLOWLABEL_MASK);
|
|
|
|
if (encap_limit >= 0 && (opt = create_tel(encap_limit)) == NULL)
|
|
goto tx_err;
|
|
|
|
if ((dst = ip6_tnl_dst_check(t)) != NULL)
|
|
dst_hold(dst);
|
|
else {
|
|
dst = ip6_route_output(NULL, &fl);
|
|
|
|
if (dst->error || xfrm_lookup(&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 (opt) {
|
|
max_headroom += 8;
|
|
mtu -= 8;
|
|
}
|
|
if (mtu < IPV6_MIN_MTU)
|
|
mtu = IPV6_MIN_MTU;
|
|
if (skb->dst && mtu < dst_mtu(skb->dst)) {
|
|
struct rt6_info *rt = (struct rt6_info *) skb->dst;
|
|
rt->rt6i_flags |= RTF_MODIFIED;
|
|
rt->u.dst.metrics[RTAX_MTU-1] = mtu;
|
|
}
|
|
if (skb->len > mtu) {
|
|
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
|
|
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_cloned(skb) || skb_shared(skb)) {
|
|
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;
|
|
}
|
|
dst_release(skb->dst);
|
|
skb->dst = dst_clone(dst);
|
|
|
|
skb->h.raw = skb->nh.raw;
|
|
|
|
if (opt)
|
|
ipv6_push_nfrag_opts(skb, opt, &proto, NULL);
|
|
|
|
skb->nh.raw = skb_push(skb, sizeof(struct ipv6hdr));
|
|
ipv6h = skb->nh.ipv6h;
|
|
*(u32*)ipv6h = fl.fl6_flowlabel | htonl(0x60000000);
|
|
dsfield = INET_ECN_encapsulate(0, dsfield);
|
|
ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
|
|
ipv6h->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
|
|
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 = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL,
|
|
skb->dst->dev, dst_output);
|
|
|
|
if (err == NET_XMIT_SUCCESS || err == NET_XMIT_CN) {
|
|
stats->tx_bytes += pkt_len;
|
|
stats->tx_packets++;
|
|
} else {
|
|
stats->tx_errors++;
|
|
stats->tx_aborted_errors++;
|
|
}
|
|
ip6_tnl_dst_store(t, dst);
|
|
|
|
kfree(opt);
|
|
|
|
t->recursion--;
|
|
return 0;
|
|
tx_err_link_failure:
|
|
stats->tx_carrier_errors++;
|
|
dst_link_failure(skb);
|
|
tx_err_dst_release:
|
|
dst_release(dst);
|
|
kfree(opt);
|
|
tx_err:
|
|
stats->tx_errors++;
|
|
stats->tx_dropped++;
|
|
kfree_skb(skb);
|
|
t->recursion--;
|
|
return 0;
|
|
}
|
|
|
|
static void ip6_tnl_set_cap(struct ip6_tnl *t)
|
|
{
|
|
struct ip6_tnl_parm *p = &t->parms;
|
|
struct in6_addr *laddr = &p->laddr;
|
|
struct in6_addr *raddr = &p->raddr;
|
|
int ltype = ipv6_addr_type(laddr);
|
|
int rtype = ipv6_addr_type(raddr);
|
|
|
|
p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV);
|
|
|
|
if (ltype != IPV6_ADDR_ANY && rtype != IPV6_ADDR_ANY &&
|
|
((ltype|rtype) &
|
|
(IPV6_ADDR_UNICAST|
|
|
IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL|
|
|
IPV6_ADDR_MAPPED|IPV6_ADDR_RESERVED)) == IPV6_ADDR_UNICAST) {
|
|
struct net_device *ldev = NULL;
|
|
int l_ok = 1;
|
|
int r_ok = 1;
|
|
|
|
if (p->link)
|
|
ldev = dev_get_by_index(p->link);
|
|
|
|
if (ltype&IPV6_ADDR_UNICAST && !ipv6_chk_addr(laddr, ldev, 0))
|
|
l_ok = 0;
|
|
|
|
if (rtype&IPV6_ADDR_UNICAST && ipv6_chk_addr(raddr, NULL, 0))
|
|
r_ok = 0;
|
|
|
|
if (l_ok && r_ok) {
|
|
if (ltype&IPV6_ADDR_UNICAST)
|
|
p->flags |= IP6_TNL_F_CAP_XMIT;
|
|
if (rtype&IPV6_ADDR_UNICAST)
|
|
p->flags |= IP6_TNL_F_CAP_RCV;
|
|
}
|
|
if (ldev)
|
|
dev_put(ldev);
|
|
}
|
|
}
|
|
|
|
static void ip6ip6_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) {
|
|
struct rt6_info *rt = rt6_lookup(&p->raddr, &p->laddr,
|
|
p->link, 0);
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ip6ip6_tnl_change - update the tunnel parameters
|
|
* @t: tunnel to be changed
|
|
* @p: tunnel configuration parameters
|
|
* @active: != 0 if tunnel is ready for use
|
|
*
|
|
* Description:
|
|
* ip6ip6_tnl_change() updates the tunnel parameters
|
|
**/
|
|
|
|
static int
|
|
ip6ip6_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;
|
|
ip6ip6_tnl_link_config(t);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ip6ip6_tnl_ioctl - configure ipv6 tunnels from userspace
|
|
* @dev: virtual device associated with tunnel
|
|
* @ifr: parameters passed from userspace
|
|
* @cmd: command to be performed
|
|
*
|
|
* Description:
|
|
* ip6ip6_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
|
|
ip6ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
|
|
{
|
|
int err = 0;
|
|
int create;
|
|
struct ip6_tnl_parm p;
|
|
struct ip6_tnl *t = NULL;
|
|
|
|
switch (cmd) {
|
|
case SIOCGETTUNNEL:
|
|
if (dev == ip6ip6_fb_tnl_dev) {
|
|
if (copy_from_user(&p,
|
|
ifr->ifr_ifru.ifru_data,
|
|
sizeof (p))) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
if ((err = ip6ip6_tnl_locate(&p, &t, 0)) == -ENODEV)
|
|
t = (struct ip6_tnl *) dev->priv;
|
|
else if (err)
|
|
break;
|
|
} else
|
|
t = (struct ip6_tnl *) dev->priv;
|
|
|
|
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;
|
|
create = (cmd == SIOCADDTUNNEL);
|
|
if (!capable(CAP_NET_ADMIN))
|
|
break;
|
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
if (!create && dev != ip6ip6_fb_tnl_dev) {
|
|
t = (struct ip6_tnl *) dev->priv;
|
|
}
|
|
if (!t && (err = ip6ip6_tnl_locate(&p, &t, create))) {
|
|
break;
|
|
}
|
|
if (cmd == SIOCCHGTUNNEL) {
|
|
if (t->dev != dev) {
|
|
err = -EEXIST;
|
|
break;
|
|
}
|
|
ip6ip6_tnl_unlink(t);
|
|
err = ip6ip6_tnl_change(t, &p);
|
|
ip6ip6_tnl_link(t);
|
|
netdev_state_change(dev);
|
|
}
|
|
if (copy_to_user(ifr->ifr_ifru.ifru_data,
|
|
&t->parms, sizeof (p))) {
|
|
err = -EFAULT;
|
|
} else {
|
|
err = 0;
|
|
}
|
|
break;
|
|
case SIOCDELTUNNEL:
|
|
err = -EPERM;
|
|
if (!capable(CAP_NET_ADMIN))
|
|
break;
|
|
|
|
if (dev == ip6ip6_fb_tnl_dev) {
|
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data,
|
|
sizeof (p))) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
err = ip6ip6_tnl_locate(&p, &t, 0);
|
|
if (err)
|
|
break;
|
|
if (t == ip6ip6_fb_tnl_dev->priv) {
|
|
err = -EPERM;
|
|
break;
|
|
}
|
|
} else {
|
|
t = (struct ip6_tnl *) dev->priv;
|
|
}
|
|
err = unregister_netdevice(t->dev);
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* ip6ip6_tnl_get_stats - return the stats for tunnel device
|
|
* @dev: virtual device associated with tunnel
|
|
*
|
|
* Return: stats for device
|
|
**/
|
|
|
|
static struct net_device_stats *
|
|
ip6ip6_tnl_get_stats(struct net_device *dev)
|
|
{
|
|
return &(((struct ip6_tnl *) dev->priv)->stat);
|
|
}
|
|
|
|
/**
|
|
* ip6ip6_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
|
|
ip6ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
if (new_mtu < IPV6_MIN_MTU) {
|
|
return -EINVAL;
|
|
}
|
|
dev->mtu = new_mtu;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ip6ip6_tnl_dev_setup - setup virtual tunnel device
|
|
* @dev: virtual device associated with tunnel
|
|
*
|
|
* Description:
|
|
* Initialize function pointers and device parameters
|
|
**/
|
|
|
|
static void ip6ip6_tnl_dev_setup(struct net_device *dev)
|
|
{
|
|
SET_MODULE_OWNER(dev);
|
|
dev->uninit = ip6ip6_tnl_dev_uninit;
|
|
dev->destructor = free_netdev;
|
|
dev->hard_start_xmit = ip6ip6_tnl_xmit;
|
|
dev->get_stats = ip6ip6_tnl_get_stats;
|
|
dev->do_ioctl = ip6ip6_tnl_ioctl;
|
|
dev->change_mtu = ip6ip6_tnl_change_mtu;
|
|
|
|
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);
|
|
}
|
|
|
|
|
|
/**
|
|
* ip6ip6_tnl_dev_init_gen - general initializer for all tunnel devices
|
|
* @dev: virtual device associated with tunnel
|
|
**/
|
|
|
|
static inline void
|
|
ip6ip6_tnl_dev_init_gen(struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = (struct ip6_tnl *) dev->priv;
|
|
t->fl.proto = IPPROTO_IPV6;
|
|
t->dev = dev;
|
|
strcpy(t->parms.name, dev->name);
|
|
}
|
|
|
|
/**
|
|
* ip6ip6_tnl_dev_init - initializer for all non fallback tunnel devices
|
|
* @dev: virtual device associated with tunnel
|
|
**/
|
|
|
|
static int
|
|
ip6ip6_tnl_dev_init(struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = (struct ip6_tnl *) dev->priv;
|
|
ip6ip6_tnl_dev_init_gen(dev);
|
|
ip6ip6_tnl_link_config(t);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ip6ip6_fb_tnl_dev_init - initializer for fallback tunnel device
|
|
* @dev: fallback device
|
|
*
|
|
* Return: 0
|
|
**/
|
|
|
|
static int
|
|
ip6ip6_fb_tnl_dev_init(struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = dev->priv;
|
|
ip6ip6_tnl_dev_init_gen(dev);
|
|
dev_hold(dev);
|
|
tnls_wc[0] = t;
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_INET6_TUNNEL
|
|
static struct xfrm6_tunnel ip6ip6_handler = {
|
|
.handler = ip6ip6_rcv,
|
|
.err_handler = ip6ip6_err,
|
|
};
|
|
|
|
static inline int ip6ip6_register(void)
|
|
{
|
|
return xfrm6_tunnel_register(&ip6ip6_handler);
|
|
}
|
|
|
|
static inline int ip6ip6_unregister(void)
|
|
{
|
|
return xfrm6_tunnel_deregister(&ip6ip6_handler);
|
|
}
|
|
#else
|
|
static struct inet6_protocol xfrm6_tunnel_protocol = {
|
|
.handler = ip6ip6_rcv,
|
|
.err_handler = ip6ip6_err,
|
|
.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
|
|
};
|
|
|
|
static inline int ip6ip6_register(void)
|
|
{
|
|
return inet6_add_protocol(&xfrm6_tunnel_protocol, IPPROTO_IPV6);
|
|
}
|
|
|
|
static inline int ip6ip6_unregister(void)
|
|
{
|
|
return inet6_del_protocol(&xfrm6_tunnel_protocol, IPPROTO_IPV6);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* ip6_tunnel_init - register protocol and reserve needed resources
|
|
*
|
|
* Return: 0 on success
|
|
**/
|
|
|
|
static int __init ip6_tunnel_init(void)
|
|
{
|
|
int err;
|
|
|
|
if (ip6ip6_register() < 0) {
|
|
printk(KERN_ERR "ip6ip6 init: can't register tunnel\n");
|
|
return -EAGAIN;
|
|
}
|
|
ip6ip6_fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
|
|
ip6ip6_tnl_dev_setup);
|
|
|
|
if (!ip6ip6_fb_tnl_dev) {
|
|
err = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
ip6ip6_fb_tnl_dev->init = ip6ip6_fb_tnl_dev_init;
|
|
|
|
if ((err = register_netdev(ip6ip6_fb_tnl_dev))) {
|
|
free_netdev(ip6ip6_fb_tnl_dev);
|
|
goto fail;
|
|
}
|
|
return 0;
|
|
fail:
|
|
ip6ip6_unregister();
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* ip6_tunnel_cleanup - free resources and unregister protocol
|
|
**/
|
|
|
|
static void __exit ip6_tunnel_cleanup(void)
|
|
{
|
|
if (ip6ip6_unregister() < 0)
|
|
printk(KERN_INFO "ip6ip6 close: can't deregister tunnel\n");
|
|
|
|
unregister_netdev(ip6ip6_fb_tnl_dev);
|
|
}
|
|
|
|
module_init(ip6_tunnel_init);
|
|
module_exit(ip6_tunnel_cleanup);
|