![Hannes Frederic Sowa](/assets/img/avatar_default.png)
This patch adds anti-spoofing checks in sit.c as specified in RFC3964 section 5.2 for 6to4 and RFC5969 section 12 for 6rd. I left out the checks which could easily be implemented with netfilter. Specifically this patch adds following logic (based loosely on the pseudocode in RFC3964 section 5.2): if prefix (inner_src_v6) == rd6_prefix (2002::/16 is the default) and outer_src_v4 != embedded_ipv4 (inner_src_v6) drop if prefix (inner_dst_v6) == rd6_prefix (or 2002::/16 is the default) and outer_dst_v4 != embedded_ipv4 (inner_dst_v6) drop accept To accomplish the specified security checks proposed by above RFCs, it is still necessary to employ uRPF filters with netfilter. These new checks only kick in if the employed addresses are within the 2002::/16 or another range specified by the 6rd-prefix (which defaults to 2002::/16). Cc: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Cc: David Miller <davem@davemloft.net> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
1626 lines
37 KiB
C
1626 lines
37 KiB
C
/*
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* IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
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* Linux INET6 implementation
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*
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* Authors:
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* Pedro Roque <roque@di.fc.ul.pt>
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* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
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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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* Changes:
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* Roger Venning <r.venning@telstra.com>: 6to4 support
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* Nate Thompson <nate@thebog.net>: 6to4 support
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* Fred Templin <fred.l.templin@boeing.com>: isatap support
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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/socket.h>
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#include <linux/sockios.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/icmp.h>
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#include <linux/slab.h>
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#include <asm/uaccess.h>
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#include <linux/init.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/if_ether.h>
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#include <net/sock.h>
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#include <net/snmp.h>
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#include <net/ipv6.h>
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#include <net/protocol.h>
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#include <net/transp_v6.h>
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#include <net/ip6_fib.h>
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#include <net/ip6_route.h>
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#include <net/ndisc.h>
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#include <net/addrconf.h>
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#include <net/ip.h>
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#include <net/udp.h>
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#include <net/icmp.h>
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#include <net/ipip.h>
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#include <net/inet_ecn.h>
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#include <net/xfrm.h>
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#include <net/dsfield.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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/*
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This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
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For comments look at net/ipv4/ip_gre.c --ANK
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*/
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#define HASH_SIZE 16
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#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
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static bool log_ecn_error = true;
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module_param(log_ecn_error, bool, 0644);
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MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
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static int ipip6_tunnel_init(struct net_device *dev);
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static void ipip6_tunnel_setup(struct net_device *dev);
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static void ipip6_dev_free(struct net_device *dev);
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static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
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__be32 *v4dst);
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static struct rtnl_link_ops sit_link_ops __read_mostly;
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static int sit_net_id __read_mostly;
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struct sit_net {
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struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
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struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
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struct ip_tunnel __rcu *tunnels_l[HASH_SIZE];
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struct ip_tunnel __rcu *tunnels_wc[1];
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struct ip_tunnel __rcu **tunnels[4];
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struct net_device *fb_tunnel_dev;
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};
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static struct rtnl_link_stats64 *ipip6_get_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *tot)
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{
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int i;
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for_each_possible_cpu(i) {
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const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
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u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
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unsigned int start;
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do {
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start = u64_stats_fetch_begin_bh(&tstats->syncp);
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rx_packets = tstats->rx_packets;
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tx_packets = tstats->tx_packets;
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rx_bytes = tstats->rx_bytes;
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tx_bytes = tstats->tx_bytes;
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} while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
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tot->rx_packets += rx_packets;
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tot->tx_packets += tx_packets;
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tot->rx_bytes += rx_bytes;
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tot->tx_bytes += tx_bytes;
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}
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tot->rx_errors = dev->stats.rx_errors;
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tot->rx_frame_errors = dev->stats.rx_frame_errors;
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tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
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tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
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tot->tx_dropped = dev->stats.tx_dropped;
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tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
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tot->tx_errors = dev->stats.tx_errors;
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return tot;
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}
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/*
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* Must be invoked with rcu_read_lock
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*/
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static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net,
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struct net_device *dev, __be32 remote, __be32 local)
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{
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unsigned int h0 = HASH(remote);
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unsigned int h1 = HASH(local);
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struct ip_tunnel *t;
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struct sit_net *sitn = net_generic(net, sit_net_id);
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for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) {
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if (local == t->parms.iph.saddr &&
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remote == t->parms.iph.daddr &&
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(!dev || !t->parms.link || dev->iflink == t->parms.link) &&
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(t->dev->flags & IFF_UP))
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return t;
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}
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for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) {
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if (remote == t->parms.iph.daddr &&
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(!dev || !t->parms.link || dev->iflink == t->parms.link) &&
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(t->dev->flags & IFF_UP))
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return t;
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}
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for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) {
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if (local == t->parms.iph.saddr &&
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(!dev || !t->parms.link || dev->iflink == t->parms.link) &&
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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(sitn->tunnels_wc[0]);
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if ((t != 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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static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
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struct ip_tunnel_parm *parms)
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{
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__be32 remote = parms->iph.daddr;
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__be32 local = parms->iph.saddr;
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unsigned int h = 0;
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int prio = 0;
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if (remote) {
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prio |= 2;
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h ^= HASH(remote);
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}
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if (local) {
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prio |= 1;
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h ^= HASH(local);
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}
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return &sitn->tunnels[prio][h];
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}
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static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
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struct ip_tunnel *t)
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{
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return __ipip6_bucket(sitn, &t->parms);
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}
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static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
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{
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struct ip_tunnel __rcu **tp;
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struct ip_tunnel *iter;
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for (tp = ipip6_bucket(sitn, t);
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(iter = rtnl_dereference(*tp)) != NULL;
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tp = &iter->next) {
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if (t == iter) {
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rcu_assign_pointer(*tp, t->next);
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break;
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}
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}
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}
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static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
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{
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struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
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rcu_assign_pointer(t->next, rtnl_dereference(*tp));
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rcu_assign_pointer(*tp, t);
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}
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static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
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{
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#ifdef CONFIG_IPV6_SIT_6RD
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struct ip_tunnel *t = netdev_priv(dev);
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if (t->dev == sitn->fb_tunnel_dev) {
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ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
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t->ip6rd.relay_prefix = 0;
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t->ip6rd.prefixlen = 16;
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t->ip6rd.relay_prefixlen = 0;
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} else {
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struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
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memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
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}
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#endif
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}
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static int ipip6_tunnel_create(struct net_device *dev)
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{
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struct ip_tunnel *t = netdev_priv(dev);
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struct net *net = dev_net(dev);
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struct sit_net *sitn = net_generic(net, sit_net_id);
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int err;
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err = ipip6_tunnel_init(dev);
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if (err < 0)
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goto out;
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ipip6_tunnel_clone_6rd(dev, sitn);
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if ((__force u16)t->parms.i_flags & SIT_ISATAP)
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dev->priv_flags |= IFF_ISATAP;
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err = register_netdevice(dev);
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if (err < 0)
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goto out;
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strcpy(t->parms.name, dev->name);
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dev->rtnl_link_ops = &sit_link_ops;
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dev_hold(dev);
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ipip6_tunnel_link(sitn, t);
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return 0;
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out:
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return err;
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}
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static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
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struct ip_tunnel_parm *parms, int create)
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{
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__be32 remote = parms->iph.daddr;
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__be32 local = parms->iph.saddr;
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struct ip_tunnel *t, *nt;
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struct ip_tunnel __rcu **tp;
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struct net_device *dev;
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char name[IFNAMSIZ];
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struct sit_net *sitn = net_generic(net, sit_net_id);
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for (tp = __ipip6_bucket(sitn, parms);
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(t = rtnl_dereference(*tp)) != NULL;
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tp = &t->next) {
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if (local == t->parms.iph.saddr &&
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remote == t->parms.iph.daddr &&
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parms->link == t->parms.link) {
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if (create)
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return NULL;
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else
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return t;
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}
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}
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if (!create)
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goto failed;
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if (parms->name[0])
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strlcpy(name, parms->name, IFNAMSIZ);
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else
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strcpy(name, "sit%d");
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dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
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if (dev == NULL)
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return NULL;
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dev_net_set(dev, net);
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nt = netdev_priv(dev);
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nt->parms = *parms;
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if (ipip6_tunnel_create(dev) < 0)
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goto failed_free;
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return nt;
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failed_free:
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ipip6_dev_free(dev);
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failed:
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return NULL;
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}
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#define for_each_prl_rcu(start) \
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for (prl = rcu_dereference(start); \
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prl; \
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prl = rcu_dereference(prl->next))
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static struct ip_tunnel_prl_entry *
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__ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
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{
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struct ip_tunnel_prl_entry *prl;
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for_each_prl_rcu(t->prl)
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if (prl->addr == addr)
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break;
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return prl;
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}
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static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
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struct ip_tunnel_prl __user *a)
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{
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struct ip_tunnel_prl kprl, *kp;
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struct ip_tunnel_prl_entry *prl;
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unsigned int cmax, c = 0, ca, len;
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int ret = 0;
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if (copy_from_user(&kprl, a, sizeof(kprl)))
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return -EFAULT;
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cmax = kprl.datalen / sizeof(kprl);
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if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
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cmax = 1;
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/* For simple GET or for root users,
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* we try harder to allocate.
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*/
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kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
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kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
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NULL;
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rcu_read_lock();
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ca = t->prl_count < cmax ? t->prl_count : cmax;
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if (!kp) {
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/* We don't try hard to allocate much memory for
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* non-root users.
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* For root users, retry allocating enough memory for
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* the answer.
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*/
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kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
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if (!kp) {
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ret = -ENOMEM;
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goto out;
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}
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}
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c = 0;
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for_each_prl_rcu(t->prl) {
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if (c >= cmax)
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break;
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if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
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continue;
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kp[c].addr = prl->addr;
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kp[c].flags = prl->flags;
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c++;
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if (kprl.addr != htonl(INADDR_ANY))
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break;
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}
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out:
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rcu_read_unlock();
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len = sizeof(*kp) * c;
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ret = 0;
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if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
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ret = -EFAULT;
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kfree(kp);
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return ret;
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}
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static int
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ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
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{
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struct ip_tunnel_prl_entry *p;
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int err = 0;
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if (a->addr == htonl(INADDR_ANY))
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return -EINVAL;
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ASSERT_RTNL();
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for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
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if (p->addr == a->addr) {
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if (chg) {
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p->flags = a->flags;
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goto out;
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}
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err = -EEXIST;
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goto out;
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}
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}
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if (chg) {
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err = -ENXIO;
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goto out;
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}
|
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|
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p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
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if (!p) {
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err = -ENOBUFS;
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goto out;
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}
|
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|
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p->next = t->prl;
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p->addr = a->addr;
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p->flags = a->flags;
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t->prl_count++;
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rcu_assign_pointer(t->prl, p);
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out:
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return err;
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}
|
|
|
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static void prl_list_destroy_rcu(struct rcu_head *head)
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{
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struct ip_tunnel_prl_entry *p, *n;
|
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|
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p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
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do {
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n = rcu_dereference_protected(p->next, 1);
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kfree(p);
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p = n;
|
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} while (p);
|
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}
|
|
|
|
static int
|
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ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
|
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{
|
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struct ip_tunnel_prl_entry *x;
|
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struct ip_tunnel_prl_entry __rcu **p;
|
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int err = 0;
|
|
|
|
ASSERT_RTNL();
|
|
|
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if (a && a->addr != htonl(INADDR_ANY)) {
|
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for (p = &t->prl;
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(x = rtnl_dereference(*p)) != NULL;
|
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p = &x->next) {
|
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if (x->addr == a->addr) {
|
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*p = x->next;
|
|
kfree_rcu(x, rcu_head);
|
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t->prl_count--;
|
|
goto out;
|
|
}
|
|
}
|
|
err = -ENXIO;
|
|
} else {
|
|
x = rtnl_dereference(t->prl);
|
|
if (x) {
|
|
t->prl_count = 0;
|
|
call_rcu(&x->rcu_head, prl_list_destroy_rcu);
|
|
t->prl = NULL;
|
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}
|
|
}
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
|
|
{
|
|
struct ip_tunnel_prl_entry *p;
|
|
int ok = 1;
|
|
|
|
rcu_read_lock();
|
|
p = __ipip6_tunnel_locate_prl(t, iph->saddr);
|
|
if (p) {
|
|
if (p->flags & PRL_DEFAULT)
|
|
skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
|
|
else
|
|
skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
|
|
} else {
|
|
const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
|
|
|
|
if (ipv6_addr_is_isatap(addr6) &&
|
|
(addr6->s6_addr32[3] == iph->saddr) &&
|
|
ipv6_chk_prefix(addr6, t->dev))
|
|
skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
|
|
else
|
|
ok = 0;
|
|
}
|
|
rcu_read_unlock();
|
|
return ok;
|
|
}
|
|
|
|
static void ipip6_tunnel_uninit(struct net_device *dev)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
struct sit_net *sitn = net_generic(net, sit_net_id);
|
|
|
|
if (dev == sitn->fb_tunnel_dev) {
|
|
RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
|
|
} else {
|
|
ipip6_tunnel_unlink(sitn, netdev_priv(dev));
|
|
ipip6_tunnel_del_prl(netdev_priv(dev), NULL);
|
|
}
|
|
dev_put(dev);
|
|
}
|
|
|
|
|
|
static int ipip6_err(struct sk_buff *skb, u32 info)
|
|
{
|
|
|
|
/* All the routers (except for Linux) return only
|
|
8 bytes of packet payload. It means, that precise relaying of
|
|
ICMP in the real Internet is absolutely infeasible.
|
|
*/
|
|
const struct iphdr *iph = (const struct iphdr *)skb->data;
|
|
const int type = icmp_hdr(skb)->type;
|
|
const int code = icmp_hdr(skb)->code;
|
|
struct ip_tunnel *t;
|
|
int err;
|
|
|
|
switch (type) {
|
|
default:
|
|
case ICMP_PARAMETERPROB:
|
|
return 0;
|
|
|
|
case ICMP_DEST_UNREACH:
|
|
switch (code) {
|
|
case ICMP_SR_FAILED:
|
|
case ICMP_PORT_UNREACH:
|
|
/* Impossible event. */
|
|
return 0;
|
|
default:
|
|
/* All others are translated to HOST_UNREACH.
|
|
rfc2003 contains "deep thoughts" about NET_UNREACH,
|
|
I believe they are just ether pollution. --ANK
|
|
*/
|
|
break;
|
|
}
|
|
break;
|
|
case ICMP_TIME_EXCEEDED:
|
|
if (code != ICMP_EXC_TTL)
|
|
return 0;
|
|
break;
|
|
case ICMP_REDIRECT:
|
|
break;
|
|
}
|
|
|
|
err = -ENOENT;
|
|
|
|
t = ipip6_tunnel_lookup(dev_net(skb->dev),
|
|
skb->dev,
|
|
iph->daddr,
|
|
iph->saddr);
|
|
if (t == NULL)
|
|
goto out;
|
|
|
|
if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
|
|
ipv4_update_pmtu(skb, dev_net(skb->dev), info,
|
|
t->dev->ifindex, 0, IPPROTO_IPV6, 0);
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
if (type == ICMP_REDIRECT) {
|
|
ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0,
|
|
IPPROTO_IPV6, 0);
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (t->parms.iph.daddr == 0)
|
|
goto out;
|
|
|
|
err = 0;
|
|
if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
|
|
goto out;
|
|
|
|
if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
|
|
t->err_count++;
|
|
else
|
|
t->err_count = 1;
|
|
t->err_time = jiffies;
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
|
|
const struct in6_addr *v6addr)
|
|
{
|
|
__be32 v4embed = 0;
|
|
if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
static int ipip6_rcv(struct sk_buff *skb)
|
|
{
|
|
const struct iphdr *iph = ip_hdr(skb);
|
|
struct ip_tunnel *tunnel;
|
|
int err;
|
|
|
|
tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
|
|
iph->saddr, iph->daddr);
|
|
if (tunnel != NULL) {
|
|
struct pcpu_tstats *tstats;
|
|
|
|
secpath_reset(skb);
|
|
skb->mac_header = skb->network_header;
|
|
skb_reset_network_header(skb);
|
|
IPCB(skb)->flags = 0;
|
|
skb->protocol = htons(ETH_P_IPV6);
|
|
skb->pkt_type = PACKET_HOST;
|
|
|
|
if (tunnel->dev->priv_flags & IFF_ISATAP) {
|
|
if (!isatap_chksrc(skb, iph, tunnel)) {
|
|
tunnel->dev->stats.rx_errors++;
|
|
goto out;
|
|
}
|
|
} else {
|
|
if (is_spoofed_6rd(tunnel, iph->saddr,
|
|
&ipv6_hdr(skb)->saddr) ||
|
|
is_spoofed_6rd(tunnel, iph->daddr,
|
|
&ipv6_hdr(skb)->daddr)) {
|
|
tunnel->dev->stats.rx_errors++;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
__skb_tunnel_rx(skb, tunnel->dev);
|
|
|
|
err = IP_ECN_decapsulate(iph, skb);
|
|
if (unlikely(err)) {
|
|
if (log_ecn_error)
|
|
net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
|
|
&iph->saddr, iph->tos);
|
|
if (err > 1) {
|
|
++tunnel->dev->stats.rx_frame_errors;
|
|
++tunnel->dev->stats.rx_errors;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
tstats = this_cpu_ptr(tunnel->dev->tstats);
|
|
tstats->rx_packets++;
|
|
tstats->rx_bytes += skb->len;
|
|
|
|
netif_rx(skb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* no tunnel matched, let upstream know, ipsec may handle it */
|
|
return 1;
|
|
out:
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
|
|
* stores the embedded IPv4 address in v4dst and returns true.
|
|
*/
|
|
static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
|
|
__be32 *v4dst)
|
|
{
|
|
#ifdef CONFIG_IPV6_SIT_6RD
|
|
if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
|
|
tunnel->ip6rd.prefixlen)) {
|
|
unsigned int pbw0, pbi0;
|
|
int pbi1;
|
|
u32 d;
|
|
|
|
pbw0 = tunnel->ip6rd.prefixlen >> 5;
|
|
pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
|
|
|
|
d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
|
|
tunnel->ip6rd.relay_prefixlen;
|
|
|
|
pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
|
|
if (pbi1 > 0)
|
|
d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
|
|
(32 - pbi1);
|
|
|
|
*v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
|
|
return true;
|
|
}
|
|
#else
|
|
if (v6dst->s6_addr16[0] == htons(0x2002)) {
|
|
/* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
|
|
memcpy(v4dst, &v6dst->s6_addr16[1], 4);
|
|
return true;
|
|
}
|
|
#endif
|
|
return false;
|
|
}
|
|
|
|
static inline __be32 try_6rd(struct ip_tunnel *tunnel,
|
|
const struct in6_addr *v6dst)
|
|
{
|
|
__be32 dst = 0;
|
|
check_6rd(tunnel, v6dst, &dst);
|
|
return dst;
|
|
}
|
|
|
|
/*
|
|
* This function assumes it is being called from dev_queue_xmit()
|
|
* and that skb is filled properly by that function.
|
|
*/
|
|
|
|
static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
|
|
struct net_device *dev)
|
|
{
|
|
struct ip_tunnel *tunnel = netdev_priv(dev);
|
|
const struct iphdr *tiph = &tunnel->parms.iph;
|
|
const struct ipv6hdr *iph6 = ipv6_hdr(skb);
|
|
u8 tos = tunnel->parms.iph.tos;
|
|
__be16 df = tiph->frag_off;
|
|
struct rtable *rt; /* Route to the other host */
|
|
struct net_device *tdev; /* Device to other host */
|
|
struct iphdr *iph; /* Our new IP header */
|
|
unsigned int max_headroom; /* The extra header space needed */
|
|
__be32 dst = tiph->daddr;
|
|
struct flowi4 fl4;
|
|
int mtu;
|
|
const struct in6_addr *addr6;
|
|
int addr_type;
|
|
|
|
if (skb->protocol != htons(ETH_P_IPV6))
|
|
goto tx_error;
|
|
|
|
if (tos == 1)
|
|
tos = ipv6_get_dsfield(iph6);
|
|
|
|
/* ISATAP (RFC4214) - must come before 6to4 */
|
|
if (dev->priv_flags & IFF_ISATAP) {
|
|
struct neighbour *neigh = NULL;
|
|
bool do_tx_error = false;
|
|
|
|
if (skb_dst(skb))
|
|
neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
|
|
|
|
if (neigh == NULL) {
|
|
net_dbg_ratelimited("sit: nexthop == NULL\n");
|
|
goto tx_error;
|
|
}
|
|
|
|
addr6 = (const struct in6_addr *)&neigh->primary_key;
|
|
addr_type = ipv6_addr_type(addr6);
|
|
|
|
if ((addr_type & IPV6_ADDR_UNICAST) &&
|
|
ipv6_addr_is_isatap(addr6))
|
|
dst = addr6->s6_addr32[3];
|
|
else
|
|
do_tx_error = true;
|
|
|
|
neigh_release(neigh);
|
|
if (do_tx_error)
|
|
goto tx_error;
|
|
}
|
|
|
|
if (!dst)
|
|
dst = try_6rd(tunnel, &iph6->daddr);
|
|
|
|
if (!dst) {
|
|
struct neighbour *neigh = NULL;
|
|
bool do_tx_error = false;
|
|
|
|
if (skb_dst(skb))
|
|
neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
|
|
|
|
if (neigh == NULL) {
|
|
net_dbg_ratelimited("sit: nexthop == NULL\n");
|
|
goto tx_error;
|
|
}
|
|
|
|
addr6 = (const struct in6_addr *)&neigh->primary_key;
|
|
addr_type = ipv6_addr_type(addr6);
|
|
|
|
if (addr_type == IPV6_ADDR_ANY) {
|
|
addr6 = &ipv6_hdr(skb)->daddr;
|
|
addr_type = ipv6_addr_type(addr6);
|
|
}
|
|
|
|
if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
|
|
dst = addr6->s6_addr32[3];
|
|
else
|
|
do_tx_error = true;
|
|
|
|
neigh_release(neigh);
|
|
if (do_tx_error)
|
|
goto tx_error;
|
|
}
|
|
|
|
rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
|
|
dst, tiph->saddr,
|
|
0, 0,
|
|
IPPROTO_IPV6, RT_TOS(tos),
|
|
tunnel->parms.link);
|
|
if (IS_ERR(rt)) {
|
|
dev->stats.tx_carrier_errors++;
|
|
goto tx_error_icmp;
|
|
}
|
|
if (rt->rt_type != RTN_UNICAST) {
|
|
ip_rt_put(rt);
|
|
dev->stats.tx_carrier_errors++;
|
|
goto tx_error_icmp;
|
|
}
|
|
tdev = rt->dst.dev;
|
|
|
|
if (tdev == dev) {
|
|
ip_rt_put(rt);
|
|
dev->stats.collisions++;
|
|
goto tx_error;
|
|
}
|
|
|
|
if (df) {
|
|
mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
|
|
|
|
if (mtu < 68) {
|
|
dev->stats.collisions++;
|
|
ip_rt_put(rt);
|
|
goto tx_error;
|
|
}
|
|
|
|
if (mtu < IPV6_MIN_MTU) {
|
|
mtu = IPV6_MIN_MTU;
|
|
df = 0;
|
|
}
|
|
|
|
if (tunnel->parms.iph.daddr && skb_dst(skb))
|
|
skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
|
|
|
|
if (skb->len > mtu) {
|
|
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
|
|
ip_rt_put(rt);
|
|
goto tx_error;
|
|
}
|
|
}
|
|
|
|
if (tunnel->err_count > 0) {
|
|
if (time_before(jiffies,
|
|
tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
|
|
tunnel->err_count--;
|
|
dst_link_failure(skb);
|
|
} else
|
|
tunnel->err_count = 0;
|
|
}
|
|
|
|
/*
|
|
* Okay, now see if we can stuff it in the buffer as-is.
|
|
*/
|
|
max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
|
|
|
|
if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
|
|
(skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
|
|
struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
|
|
if (!new_skb) {
|
|
ip_rt_put(rt);
|
|
dev->stats.tx_dropped++;
|
|
dev_kfree_skb(skb);
|
|
return NETDEV_TX_OK;
|
|
}
|
|
if (skb->sk)
|
|
skb_set_owner_w(new_skb, skb->sk);
|
|
dev_kfree_skb(skb);
|
|
skb = new_skb;
|
|
iph6 = ipv6_hdr(skb);
|
|
}
|
|
|
|
skb->transport_header = skb->network_header;
|
|
skb_push(skb, sizeof(struct iphdr));
|
|
skb_reset_network_header(skb);
|
|
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
|
|
IPCB(skb)->flags = 0;
|
|
skb_dst_drop(skb);
|
|
skb_dst_set(skb, &rt->dst);
|
|
|
|
/*
|
|
* Push down and install the IPIP header.
|
|
*/
|
|
|
|
iph = ip_hdr(skb);
|
|
iph->version = 4;
|
|
iph->ihl = sizeof(struct iphdr)>>2;
|
|
iph->frag_off = df;
|
|
iph->protocol = IPPROTO_IPV6;
|
|
iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
|
|
iph->daddr = fl4.daddr;
|
|
iph->saddr = fl4.saddr;
|
|
|
|
if ((iph->ttl = tiph->ttl) == 0)
|
|
iph->ttl = iph6->hop_limit;
|
|
|
|
iptunnel_xmit(skb, dev);
|
|
return NETDEV_TX_OK;
|
|
|
|
tx_error_icmp:
|
|
dst_link_failure(skb);
|
|
tx_error:
|
|
dev->stats.tx_errors++;
|
|
dev_kfree_skb(skb);
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
static void ipip6_tunnel_bind_dev(struct net_device *dev)
|
|
{
|
|
struct net_device *tdev = NULL;
|
|
struct ip_tunnel *tunnel;
|
|
const struct iphdr *iph;
|
|
struct flowi4 fl4;
|
|
|
|
tunnel = netdev_priv(dev);
|
|
iph = &tunnel->parms.iph;
|
|
|
|
if (iph->daddr) {
|
|
struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
|
|
iph->daddr, iph->saddr,
|
|
0, 0,
|
|
IPPROTO_IPV6,
|
|
RT_TOS(iph->tos),
|
|
tunnel->parms.link);
|
|
|
|
if (!IS_ERR(rt)) {
|
|
tdev = rt->dst.dev;
|
|
ip_rt_put(rt);
|
|
}
|
|
dev->flags |= IFF_POINTOPOINT;
|
|
}
|
|
|
|
if (!tdev && tunnel->parms.link)
|
|
tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
|
|
|
|
if (tdev) {
|
|
dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
|
|
dev->mtu = tdev->mtu - sizeof(struct iphdr);
|
|
if (dev->mtu < IPV6_MIN_MTU)
|
|
dev->mtu = IPV6_MIN_MTU;
|
|
}
|
|
dev->iflink = tunnel->parms.link;
|
|
}
|
|
|
|
static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)
|
|
{
|
|
struct net *net = dev_net(t->dev);
|
|
struct sit_net *sitn = net_generic(net, sit_net_id);
|
|
|
|
ipip6_tunnel_unlink(sitn, t);
|
|
synchronize_net();
|
|
t->parms.iph.saddr = p->iph.saddr;
|
|
t->parms.iph.daddr = p->iph.daddr;
|
|
memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
|
|
memcpy(t->dev->broadcast, &p->iph.daddr, 4);
|
|
ipip6_tunnel_link(sitn, t);
|
|
t->parms.iph.ttl = p->iph.ttl;
|
|
t->parms.iph.tos = p->iph.tos;
|
|
if (t->parms.link != p->link) {
|
|
t->parms.link = p->link;
|
|
ipip6_tunnel_bind_dev(t->dev);
|
|
}
|
|
netdev_state_change(t->dev);
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6_SIT_6RD
|
|
static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
|
|
struct ip_tunnel_6rd *ip6rd)
|
|
{
|
|
struct in6_addr prefix;
|
|
__be32 relay_prefix;
|
|
|
|
if (ip6rd->relay_prefixlen > 32 ||
|
|
ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
|
|
return -EINVAL;
|
|
|
|
ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
|
|
if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
|
|
return -EINVAL;
|
|
if (ip6rd->relay_prefixlen)
|
|
relay_prefix = ip6rd->relay_prefix &
|
|
htonl(0xffffffffUL <<
|
|
(32 - ip6rd->relay_prefixlen));
|
|
else
|
|
relay_prefix = 0;
|
|
if (relay_prefix != ip6rd->relay_prefix)
|
|
return -EINVAL;
|
|
|
|
t->ip6rd.prefix = prefix;
|
|
t->ip6rd.relay_prefix = relay_prefix;
|
|
t->ip6rd.prefixlen = ip6rd->prefixlen;
|
|
t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
|
|
netdev_state_change(t->dev);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
|
|
{
|
|
int err = 0;
|
|
struct ip_tunnel_parm p;
|
|
struct ip_tunnel_prl prl;
|
|
struct ip_tunnel *t;
|
|
struct net *net = dev_net(dev);
|
|
struct sit_net *sitn = net_generic(net, sit_net_id);
|
|
#ifdef CONFIG_IPV6_SIT_6RD
|
|
struct ip_tunnel_6rd ip6rd;
|
|
#endif
|
|
|
|
switch (cmd) {
|
|
case SIOCGETTUNNEL:
|
|
#ifdef CONFIG_IPV6_SIT_6RD
|
|
case SIOCGET6RD:
|
|
#endif
|
|
t = NULL;
|
|
if (dev == sitn->fb_tunnel_dev) {
|
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
t = ipip6_tunnel_locate(net, &p, 0);
|
|
}
|
|
if (t == NULL)
|
|
t = netdev_priv(dev);
|
|
|
|
err = -EFAULT;
|
|
if (cmd == SIOCGETTUNNEL) {
|
|
memcpy(&p, &t->parms, sizeof(p));
|
|
if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
|
|
sizeof(p)))
|
|
goto done;
|
|
#ifdef CONFIG_IPV6_SIT_6RD
|
|
} else {
|
|
ip6rd.prefix = t->ip6rd.prefix;
|
|
ip6rd.relay_prefix = t->ip6rd.relay_prefix;
|
|
ip6rd.prefixlen = t->ip6rd.prefixlen;
|
|
ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
|
|
if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
|
|
sizeof(ip6rd)))
|
|
goto done;
|
|
#endif
|
|
}
|
|
err = 0;
|
|
break;
|
|
|
|
case SIOCADDTUNNEL:
|
|
case SIOCCHGTUNNEL:
|
|
err = -EPERM;
|
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
|
|
goto done;
|
|
|
|
err = -EFAULT;
|
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
|
|
goto done;
|
|
|
|
err = -EINVAL;
|
|
if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
|
|
p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
|
|
goto done;
|
|
if (p.iph.ttl)
|
|
p.iph.frag_off |= htons(IP_DF);
|
|
|
|
t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
|
|
|
|
if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
|
|
if (t != NULL) {
|
|
if (t->dev != dev) {
|
|
err = -EEXIST;
|
|
break;
|
|
}
|
|
} else {
|
|
if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
|
|
(!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
t = netdev_priv(dev);
|
|
}
|
|
|
|
ipip6_tunnel_update(t, &p);
|
|
}
|
|
|
|
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 (!ns_capable(net->user_ns, CAP_NET_ADMIN))
|
|
goto done;
|
|
|
|
if (dev == sitn->fb_tunnel_dev) {
|
|
err = -EFAULT;
|
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
|
|
goto done;
|
|
err = -ENOENT;
|
|
if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
|
|
goto done;
|
|
err = -EPERM;
|
|
if (t == netdev_priv(sitn->fb_tunnel_dev))
|
|
goto done;
|
|
dev = t->dev;
|
|
}
|
|
unregister_netdevice(dev);
|
|
err = 0;
|
|
break;
|
|
|
|
case SIOCGETPRL:
|
|
err = -EINVAL;
|
|
if (dev == sitn->fb_tunnel_dev)
|
|
goto done;
|
|
err = -ENOENT;
|
|
if (!(t = netdev_priv(dev)))
|
|
goto done;
|
|
err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
|
|
break;
|
|
|
|
case SIOCADDPRL:
|
|
case SIOCDELPRL:
|
|
case SIOCCHGPRL:
|
|
err = -EPERM;
|
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
|
|
goto done;
|
|
err = -EINVAL;
|
|
if (dev == sitn->fb_tunnel_dev)
|
|
goto done;
|
|
err = -EFAULT;
|
|
if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
|
|
goto done;
|
|
err = -ENOENT;
|
|
if (!(t = netdev_priv(dev)))
|
|
goto done;
|
|
|
|
switch (cmd) {
|
|
case SIOCDELPRL:
|
|
err = ipip6_tunnel_del_prl(t, &prl);
|
|
break;
|
|
case SIOCADDPRL:
|
|
case SIOCCHGPRL:
|
|
err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
|
|
break;
|
|
}
|
|
netdev_state_change(dev);
|
|
break;
|
|
|
|
#ifdef CONFIG_IPV6_SIT_6RD
|
|
case SIOCADD6RD:
|
|
case SIOCCHG6RD:
|
|
case SIOCDEL6RD:
|
|
err = -EPERM;
|
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
|
|
goto done;
|
|
|
|
err = -EFAULT;
|
|
if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
|
|
sizeof(ip6rd)))
|
|
goto done;
|
|
|
|
t = netdev_priv(dev);
|
|
|
|
if (cmd != SIOCDEL6RD) {
|
|
err = ipip6_tunnel_update_6rd(t, &ip6rd);
|
|
if (err < 0)
|
|
goto done;
|
|
} else
|
|
ipip6_tunnel_clone_6rd(dev, sitn);
|
|
|
|
err = 0;
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
err = -EINVAL;
|
|
}
|
|
|
|
done:
|
|
return err;
|
|
}
|
|
|
|
static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
|
|
return -EINVAL;
|
|
dev->mtu = new_mtu;
|
|
return 0;
|
|
}
|
|
|
|
static const struct net_device_ops ipip6_netdev_ops = {
|
|
.ndo_uninit = ipip6_tunnel_uninit,
|
|
.ndo_start_xmit = ipip6_tunnel_xmit,
|
|
.ndo_do_ioctl = ipip6_tunnel_ioctl,
|
|
.ndo_change_mtu = ipip6_tunnel_change_mtu,
|
|
.ndo_get_stats64= ipip6_get_stats64,
|
|
};
|
|
|
|
static void ipip6_dev_free(struct net_device *dev)
|
|
{
|
|
free_percpu(dev->tstats);
|
|
free_netdev(dev);
|
|
}
|
|
|
|
static void ipip6_tunnel_setup(struct net_device *dev)
|
|
{
|
|
dev->netdev_ops = &ipip6_netdev_ops;
|
|
dev->destructor = ipip6_dev_free;
|
|
|
|
dev->type = ARPHRD_SIT;
|
|
dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
|
|
dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
|
|
dev->flags = IFF_NOARP;
|
|
dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
|
|
dev->iflink = 0;
|
|
dev->addr_len = 4;
|
|
dev->features |= NETIF_F_NETNS_LOCAL;
|
|
dev->features |= NETIF_F_LLTX;
|
|
}
|
|
|
|
static int ipip6_tunnel_init(struct net_device *dev)
|
|
{
|
|
struct ip_tunnel *tunnel = netdev_priv(dev);
|
|
|
|
tunnel->dev = dev;
|
|
|
|
memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
|
|
memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
|
|
|
|
ipip6_tunnel_bind_dev(dev);
|
|
dev->tstats = alloc_percpu(struct pcpu_tstats);
|
|
if (!dev->tstats)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
|
|
{
|
|
struct ip_tunnel *tunnel = netdev_priv(dev);
|
|
struct iphdr *iph = &tunnel->parms.iph;
|
|
struct net *net = dev_net(dev);
|
|
struct sit_net *sitn = net_generic(net, sit_net_id);
|
|
|
|
tunnel->dev = dev;
|
|
strcpy(tunnel->parms.name, dev->name);
|
|
|
|
iph->version = 4;
|
|
iph->protocol = IPPROTO_IPV6;
|
|
iph->ihl = 5;
|
|
iph->ttl = 64;
|
|
|
|
dev->tstats = alloc_percpu(struct pcpu_tstats);
|
|
if (!dev->tstats)
|
|
return -ENOMEM;
|
|
dev_hold(dev);
|
|
rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
|
|
return 0;
|
|
}
|
|
|
|
static void ipip6_netlink_parms(struct nlattr *data[],
|
|
struct ip_tunnel_parm *parms)
|
|
{
|
|
memset(parms, 0, sizeof(*parms));
|
|
|
|
parms->iph.version = 4;
|
|
parms->iph.protocol = IPPROTO_IPV6;
|
|
parms->iph.ihl = 5;
|
|
parms->iph.ttl = 64;
|
|
|
|
if (!data)
|
|
return;
|
|
|
|
if (data[IFLA_IPTUN_LINK])
|
|
parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
|
|
|
|
if (data[IFLA_IPTUN_LOCAL])
|
|
parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
|
|
|
|
if (data[IFLA_IPTUN_REMOTE])
|
|
parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
|
|
|
|
if (data[IFLA_IPTUN_TTL]) {
|
|
parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
|
|
if (parms->iph.ttl)
|
|
parms->iph.frag_off = htons(IP_DF);
|
|
}
|
|
|
|
if (data[IFLA_IPTUN_TOS])
|
|
parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
|
|
|
|
if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
|
|
parms->iph.frag_off = htons(IP_DF);
|
|
|
|
if (data[IFLA_IPTUN_FLAGS])
|
|
parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6_SIT_6RD
|
|
/* This function returns true when 6RD attributes are present in the nl msg */
|
|
static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
|
|
struct ip_tunnel_6rd *ip6rd)
|
|
{
|
|
bool ret = false;
|
|
memset(ip6rd, 0, sizeof(*ip6rd));
|
|
|
|
if (!data)
|
|
return ret;
|
|
|
|
if (data[IFLA_IPTUN_6RD_PREFIX]) {
|
|
ret = true;
|
|
nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX],
|
|
sizeof(struct in6_addr));
|
|
}
|
|
|
|
if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
|
|
ret = true;
|
|
ip6rd->relay_prefix =
|
|
nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
|
|
}
|
|
|
|
if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
|
|
ret = true;
|
|
ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
|
|
}
|
|
|
|
if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
|
|
ret = true;
|
|
ip6rd->relay_prefixlen =
|
|
nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
static int ipip6_newlink(struct net *src_net, struct net_device *dev,
|
|
struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
struct ip_tunnel *nt;
|
|
#ifdef CONFIG_IPV6_SIT_6RD
|
|
struct ip_tunnel_6rd ip6rd;
|
|
#endif
|
|
int err;
|
|
|
|
nt = netdev_priv(dev);
|
|
ipip6_netlink_parms(data, &nt->parms);
|
|
|
|
if (ipip6_tunnel_locate(net, &nt->parms, 0))
|
|
return -EEXIST;
|
|
|
|
err = ipip6_tunnel_create(dev);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
#ifdef CONFIG_IPV6_SIT_6RD
|
|
if (ipip6_netlink_6rd_parms(data, &ip6rd))
|
|
err = ipip6_tunnel_update_6rd(nt, &ip6rd);
|
|
#endif
|
|
|
|
return err;
|
|
}
|
|
|
|
static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
|
|
struct nlattr *data[])
|
|
{
|
|
struct ip_tunnel *t;
|
|
struct ip_tunnel_parm p;
|
|
struct net *net = dev_net(dev);
|
|
struct sit_net *sitn = net_generic(net, sit_net_id);
|
|
#ifdef CONFIG_IPV6_SIT_6RD
|
|
struct ip_tunnel_6rd ip6rd;
|
|
#endif
|
|
|
|
if (dev == sitn->fb_tunnel_dev)
|
|
return -EINVAL;
|
|
|
|
ipip6_netlink_parms(data, &p);
|
|
|
|
if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
|
|
(!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
|
|
return -EINVAL;
|
|
|
|
t = ipip6_tunnel_locate(net, &p, 0);
|
|
|
|
if (t) {
|
|
if (t->dev != dev)
|
|
return -EEXIST;
|
|
} else
|
|
t = netdev_priv(dev);
|
|
|
|
ipip6_tunnel_update(t, &p);
|
|
|
|
#ifdef CONFIG_IPV6_SIT_6RD
|
|
if (ipip6_netlink_6rd_parms(data, &ip6rd))
|
|
return ipip6_tunnel_update_6rd(t, &ip6rd);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static size_t ipip6_get_size(const struct net_device *dev)
|
|
{
|
|
return
|
|
/* IFLA_IPTUN_LINK */
|
|
nla_total_size(4) +
|
|
/* IFLA_IPTUN_LOCAL */
|
|
nla_total_size(4) +
|
|
/* IFLA_IPTUN_REMOTE */
|
|
nla_total_size(4) +
|
|
/* IFLA_IPTUN_TTL */
|
|
nla_total_size(1) +
|
|
/* IFLA_IPTUN_TOS */
|
|
nla_total_size(1) +
|
|
/* IFLA_IPTUN_PMTUDISC */
|
|
nla_total_size(1) +
|
|
/* IFLA_IPTUN_FLAGS */
|
|
nla_total_size(2) +
|
|
#ifdef CONFIG_IPV6_SIT_6RD
|
|
/* IFLA_IPTUN_6RD_PREFIX */
|
|
nla_total_size(sizeof(struct in6_addr)) +
|
|
/* IFLA_IPTUN_6RD_RELAY_PREFIX */
|
|
nla_total_size(4) +
|
|
/* IFLA_IPTUN_6RD_PREFIXLEN */
|
|
nla_total_size(2) +
|
|
/* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
|
|
nla_total_size(2) +
|
|
#endif
|
|
0;
|
|
}
|
|
|
|
static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
|
|
{
|
|
struct ip_tunnel *tunnel = netdev_priv(dev);
|
|
struct ip_tunnel_parm *parm = &tunnel->parms;
|
|
|
|
if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
|
|
nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
|
|
nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
|
|
nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
|
|
nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
|
|
nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
|
|
!!(parm->iph.frag_off & htons(IP_DF))) ||
|
|
nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags))
|
|
goto nla_put_failure;
|
|
|
|
#ifdef CONFIG_IPV6_SIT_6RD
|
|
if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr),
|
|
&tunnel->ip6rd.prefix) ||
|
|
nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
|
|
tunnel->ip6rd.relay_prefix) ||
|
|
nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
|
|
tunnel->ip6rd.prefixlen) ||
|
|
nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
|
|
tunnel->ip6rd.relay_prefixlen))
|
|
goto nla_put_failure;
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
|
|
[IFLA_IPTUN_LINK] = { .type = NLA_U32 },
|
|
[IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
|
|
[IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
|
|
[IFLA_IPTUN_TTL] = { .type = NLA_U8 },
|
|
[IFLA_IPTUN_TOS] = { .type = NLA_U8 },
|
|
[IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
|
|
[IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
|
|
#ifdef CONFIG_IPV6_SIT_6RD
|
|
[IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
|
|
[IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
|
|
[IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
|
|
[IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
|
|
#endif
|
|
};
|
|
|
|
static struct rtnl_link_ops sit_link_ops __read_mostly = {
|
|
.kind = "sit",
|
|
.maxtype = IFLA_IPTUN_MAX,
|
|
.policy = ipip6_policy,
|
|
.priv_size = sizeof(struct ip_tunnel),
|
|
.setup = ipip6_tunnel_setup,
|
|
.newlink = ipip6_newlink,
|
|
.changelink = ipip6_changelink,
|
|
.get_size = ipip6_get_size,
|
|
.fill_info = ipip6_fill_info,
|
|
};
|
|
|
|
static struct xfrm_tunnel sit_handler __read_mostly = {
|
|
.handler = ipip6_rcv,
|
|
.err_handler = ipip6_err,
|
|
.priority = 1,
|
|
};
|
|
|
|
static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head)
|
|
{
|
|
int prio;
|
|
|
|
for (prio = 1; prio < 4; prio++) {
|
|
int h;
|
|
for (h = 0; h < HASH_SIZE; h++) {
|
|
struct ip_tunnel *t;
|
|
|
|
t = rtnl_dereference(sitn->tunnels[prio][h]);
|
|
while (t != NULL) {
|
|
unregister_netdevice_queue(t->dev, head);
|
|
t = rtnl_dereference(t->next);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int __net_init sit_init_net(struct net *net)
|
|
{
|
|
struct sit_net *sitn = net_generic(net, sit_net_id);
|
|
struct ip_tunnel *t;
|
|
int err;
|
|
|
|
sitn->tunnels[0] = sitn->tunnels_wc;
|
|
sitn->tunnels[1] = sitn->tunnels_l;
|
|
sitn->tunnels[2] = sitn->tunnels_r;
|
|
sitn->tunnels[3] = sitn->tunnels_r_l;
|
|
|
|
sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
|
|
ipip6_tunnel_setup);
|
|
if (!sitn->fb_tunnel_dev) {
|
|
err = -ENOMEM;
|
|
goto err_alloc_dev;
|
|
}
|
|
dev_net_set(sitn->fb_tunnel_dev, net);
|
|
|
|
err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
|
|
if (err)
|
|
goto err_dev_free;
|
|
|
|
ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
|
|
|
|
if ((err = register_netdev(sitn->fb_tunnel_dev)))
|
|
goto err_reg_dev;
|
|
|
|
t = netdev_priv(sitn->fb_tunnel_dev);
|
|
|
|
strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
|
|
return 0;
|
|
|
|
err_reg_dev:
|
|
dev_put(sitn->fb_tunnel_dev);
|
|
err_dev_free:
|
|
ipip6_dev_free(sitn->fb_tunnel_dev);
|
|
err_alloc_dev:
|
|
return err;
|
|
}
|
|
|
|
static void __net_exit sit_exit_net(struct net *net)
|
|
{
|
|
struct sit_net *sitn = net_generic(net, sit_net_id);
|
|
LIST_HEAD(list);
|
|
|
|
rtnl_lock();
|
|
sit_destroy_tunnels(sitn, &list);
|
|
unregister_netdevice_queue(sitn->fb_tunnel_dev, &list);
|
|
unregister_netdevice_many(&list);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static struct pernet_operations sit_net_ops = {
|
|
.init = sit_init_net,
|
|
.exit = sit_exit_net,
|
|
.id = &sit_net_id,
|
|
.size = sizeof(struct sit_net),
|
|
};
|
|
|
|
static void __exit sit_cleanup(void)
|
|
{
|
|
rtnl_link_unregister(&sit_link_ops);
|
|
xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
|
|
|
|
unregister_pernet_device(&sit_net_ops);
|
|
rcu_barrier(); /* Wait for completion of call_rcu()'s */
|
|
}
|
|
|
|
static int __init sit_init(void)
|
|
{
|
|
int err;
|
|
|
|
pr_info("IPv6 over IPv4 tunneling driver\n");
|
|
|
|
err = register_pernet_device(&sit_net_ops);
|
|
if (err < 0)
|
|
return err;
|
|
err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
|
|
if (err < 0) {
|
|
pr_info("%s: can't add protocol\n", __func__);
|
|
goto xfrm_tunnel_failed;
|
|
}
|
|
err = rtnl_link_register(&sit_link_ops);
|
|
if (err < 0)
|
|
goto rtnl_link_failed;
|
|
|
|
out:
|
|
return err;
|
|
|
|
rtnl_link_failed:
|
|
xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
|
|
xfrm_tunnel_failed:
|
|
unregister_pernet_device(&sit_net_ops);
|
|
goto out;
|
|
}
|
|
|
|
module_init(sit_init);
|
|
module_exit(sit_cleanup);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_NETDEV("sit0");
|