1929 lines
45 KiB
C
1929 lines
45 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 <linux/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/ip_tunnels.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 IP6_SIT_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 unsigned int sit_net_id __read_mostly;
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struct sit_net {
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struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE];
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struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE];
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struct ip_tunnel __rcu *tunnels_l[IP6_SIT_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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/*
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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->ifindex == 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->ifindex == 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->ifindex == 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 && (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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memcpy(dev->dev_addr, &t->parms.iph.saddr, 4);
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memcpy(dev->broadcast, &t->parms.iph.daddr, 4);
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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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dev->rtnl_link_ops = &sit_link_ops;
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err = register_netdevice(dev);
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if (err < 0)
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goto out;
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ipip6_tunnel_clone_6rd(dev, sitn);
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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, NET_NAME_UNKNOWN,
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ipip6_tunnel_setup);
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if (!dev)
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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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free_netdev(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 | __GFP_NOWARN) :
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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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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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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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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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}
|
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|
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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;
|
|
|
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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;
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kfree_rcu(x, rcu_head);
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t->prl_count--;
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goto out;
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}
|
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}
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err = -ENXIO;
|
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} else {
|
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x = rtnl_dereference(t->prl);
|
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if (x) {
|
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t->prl_count = 0;
|
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call_rcu(&x->rcu_head, prl_list_destroy_rcu);
|
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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;
|
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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 ip_tunnel *tunnel = netdev_priv(dev);
|
|
struct sit_net *sitn = net_generic(tunnel->net, sit_net_id);
|
|
|
|
if (dev == sitn->fb_tunnel_dev) {
|
|
RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
|
|
} else {
|
|
ipip6_tunnel_unlink(sitn, tunnel);
|
|
ipip6_tunnel_del_prl(tunnel, NULL);
|
|
}
|
|
dst_cache_reset(&tunnel->dst_cache);
|
|
dev_put(dev);
|
|
}
|
|
|
|
static int ipip6_err(struct sk_buff *skb, u32 info)
|
|
{
|
|
const struct iphdr *iph = (const struct iphdr *)skb->data;
|
|
const int type = icmp_hdr(skb)->type;
|
|
const int code = icmp_hdr(skb)->code;
|
|
unsigned int data_len = 0;
|
|
struct ip_tunnel *t;
|
|
int err;
|
|
|
|
switch (type) {
|
|
default:
|
|
case ICMP_PARAMETERPROB:
|
|
return 0;
|
|
|
|
case ICMP_DEST_UNREACH:
|
|
switch (code) {
|
|
case ICMP_SR_FAILED:
|
|
/* 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;
|
|
data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */
|
|
break;
|
|
case ICMP_REDIRECT:
|
|
break;
|
|
}
|
|
|
|
err = -ENOENT;
|
|
|
|
t = ipip6_tunnel_lookup(dev_net(skb->dev),
|
|
skb->dev,
|
|
iph->daddr,
|
|
iph->saddr);
|
|
if (!t)
|
|
goto out;
|
|
|
|
if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
|
|
ipv4_update_pmtu(skb, dev_net(skb->dev), info,
|
|
t->parms.link, 0, iph->protocol, 0);
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
if (type == ICMP_REDIRECT) {
|
|
ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0,
|
|
iph->protocol, 0);
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
|
|
err = 0;
|
|
if (!ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len))
|
|
goto out;
|
|
|
|
if (t->parms.iph.daddr == 0)
|
|
goto out;
|
|
|
|
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;
|
|
}
|
|
|
|
/* Checks if an address matches an address on the tunnel interface.
|
|
* Used to detect the NAT of proto 41 packets and let them pass spoofing test.
|
|
* Long story:
|
|
* This function is called after we considered the packet as spoofed
|
|
* in is_spoofed_6rd.
|
|
* We may have a router that is doing NAT for proto 41 packets
|
|
* for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb
|
|
* will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd
|
|
* function will return true, dropping the packet.
|
|
* But, we can still check if is spoofed against the IP
|
|
* addresses associated with the interface.
|
|
*/
|
|
static bool only_dnatted(const struct ip_tunnel *tunnel,
|
|
const struct in6_addr *v6dst)
|
|
{
|
|
int prefix_len;
|
|
|
|
#ifdef CONFIG_IPV6_SIT_6RD
|
|
prefix_len = tunnel->ip6rd.prefixlen + 32
|
|
- tunnel->ip6rd.relay_prefixlen;
|
|
#else
|
|
prefix_len = 48;
|
|
#endif
|
|
return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev);
|
|
}
|
|
|
|
/* Returns true if a packet is spoofed */
|
|
static bool packet_is_spoofed(struct sk_buff *skb,
|
|
const struct iphdr *iph,
|
|
struct ip_tunnel *tunnel)
|
|
{
|
|
const struct ipv6hdr *ipv6h;
|
|
|
|
if (tunnel->dev->priv_flags & IFF_ISATAP) {
|
|
if (!isatap_chksrc(skb, iph, tunnel))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
if (tunnel->dev->flags & IFF_POINTOPOINT)
|
|
return false;
|
|
|
|
ipv6h = ipv6_hdr(skb);
|
|
|
|
if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) {
|
|
net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
|
|
&iph->saddr, &ipv6h->saddr,
|
|
&iph->daddr, &ipv6h->daddr);
|
|
return true;
|
|
}
|
|
|
|
if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr)))
|
|
return false;
|
|
|
|
if (only_dnatted(tunnel, &ipv6h->daddr))
|
|
return false;
|
|
|
|
net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
|
|
&iph->saddr, &ipv6h->saddr,
|
|
&iph->daddr, &ipv6h->daddr);
|
|
return true;
|
|
}
|
|
|
|
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) {
|
|
struct pcpu_sw_netstats *tstats;
|
|
|
|
if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
|
|
tunnel->parms.iph.protocol != 0)
|
|
goto out;
|
|
|
|
skb->mac_header = skb->network_header;
|
|
skb_reset_network_header(skb);
|
|
IPCB(skb)->flags = 0;
|
|
skb->dev = tunnel->dev;
|
|
|
|
if (packet_is_spoofed(skb, iph, tunnel)) {
|
|
tunnel->dev->stats.rx_errors++;
|
|
goto out;
|
|
}
|
|
|
|
if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6),
|
|
!net_eq(tunnel->net, dev_net(tunnel->dev))))
|
|
goto out;
|
|
|
|
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);
|
|
u64_stats_update_begin(&tstats->syncp);
|
|
tstats->rx_packets++;
|
|
tstats->rx_bytes += skb->len;
|
|
u64_stats_update_end(&tstats->syncp);
|
|
|
|
netif_rx(skb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* no tunnel matched, let upstream know, ipsec may handle it */
|
|
return 1;
|
|
out:
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static const struct tnl_ptk_info ipip_tpi = {
|
|
/* no tunnel info required for ipip. */
|
|
.proto = htons(ETH_P_IP),
|
|
};
|
|
|
|
#if IS_ENABLED(CONFIG_MPLS)
|
|
static const struct tnl_ptk_info mplsip_tpi = {
|
|
/* no tunnel info required for mplsip. */
|
|
.proto = htons(ETH_P_MPLS_UC),
|
|
};
|
|
#endif
|
|
|
|
static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
|
|
{
|
|
const struct iphdr *iph;
|
|
struct ip_tunnel *tunnel;
|
|
|
|
iph = ip_hdr(skb);
|
|
tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
|
|
iph->saddr, iph->daddr);
|
|
if (tunnel) {
|
|
const struct tnl_ptk_info *tpi;
|
|
|
|
if (tunnel->parms.iph.protocol != ipproto &&
|
|
tunnel->parms.iph.protocol != 0)
|
|
goto drop;
|
|
|
|
if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
|
|
goto drop;
|
|
#if IS_ENABLED(CONFIG_MPLS)
|
|
if (ipproto == IPPROTO_MPLS)
|
|
tpi = &mplsip_tpi;
|
|
else
|
|
#endif
|
|
tpi = &ipip_tpi;
|
|
if (iptunnel_pull_header(skb, 0, tpi->proto, false))
|
|
goto drop;
|
|
return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
|
|
}
|
|
|
|
return 1;
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int ipip_rcv(struct sk_buff *skb)
|
|
{
|
|
return sit_tunnel_rcv(skb, IPPROTO_IPIP);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_MPLS)
|
|
static int mplsip_rcv(struct sk_buff *skb)
|
|
{
|
|
return sit_tunnel_rcv(skb, IPPROTO_MPLS);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* 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 */
|
|
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;
|
|
u8 ttl;
|
|
u8 protocol = IPPROTO_IPV6;
|
|
int t_hlen = tunnel->hlen + sizeof(struct iphdr);
|
|
|
|
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) {
|
|
net_dbg_ratelimited("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) {
|
|
net_dbg_ratelimited("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;
|
|
}
|
|
|
|
flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark,
|
|
RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6,
|
|
0, dst, tiph->saddr, 0, 0,
|
|
sock_net_uid(tunnel->net, NULL));
|
|
rt = ip_route_output_flow(tunnel->net, &fl4, NULL);
|
|
|
|
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 (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) {
|
|
ip_rt_put(rt);
|
|
goto tx_error;
|
|
}
|
|
|
|
if (df) {
|
|
mtu = dst_mtu(&rt->dst) - t_hlen;
|
|
|
|
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 && !skb_is_gso(skb)) {
|
|
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) + t_hlen;
|
|
|
|
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++;
|
|
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);
|
|
}
|
|
ttl = tiph->ttl;
|
|
if (ttl == 0)
|
|
ttl = iph6->hop_limit;
|
|
tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
|
|
|
|
if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) {
|
|
ip_rt_put(rt);
|
|
goto tx_error;
|
|
}
|
|
|
|
skb_set_inner_ipproto(skb, IPPROTO_IPV6);
|
|
|
|
iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl,
|
|
df, !net_eq(tunnel->net, dev_net(dev)));
|
|
return NETDEV_TX_OK;
|
|
|
|
tx_error_icmp:
|
|
dst_link_failure(skb);
|
|
tx_error:
|
|
kfree_skb(skb);
|
|
dev->stats.tx_errors++;
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb,
|
|
struct net_device *dev, u8 ipproto)
|
|
{
|
|
struct ip_tunnel *tunnel = netdev_priv(dev);
|
|
const struct iphdr *tiph = &tunnel->parms.iph;
|
|
|
|
if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
|
|
goto tx_error;
|
|
|
|
skb_set_inner_ipproto(skb, ipproto);
|
|
|
|
ip_tunnel_xmit(skb, dev, tiph, ipproto);
|
|
return NETDEV_TX_OK;
|
|
tx_error:
|
|
kfree_skb(skb);
|
|
dev->stats.tx_errors++;
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
|
|
struct net_device *dev)
|
|
{
|
|
switch (skb->protocol) {
|
|
case htons(ETH_P_IP):
|
|
sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP);
|
|
break;
|
|
case htons(ETH_P_IPV6):
|
|
ipip6_tunnel_xmit(skb, dev);
|
|
break;
|
|
#if IS_ENABLED(CONFIG_MPLS)
|
|
case htons(ETH_P_MPLS_UC):
|
|
sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS);
|
|
break;
|
|
#endif
|
|
default:
|
|
goto tx_err;
|
|
}
|
|
|
|
return NETDEV_TX_OK;
|
|
|
|
tx_err:
|
|
dev->stats.tx_errors++;
|
|
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(tunnel->net, &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(tunnel->net, tunnel->parms.link);
|
|
|
|
if (tdev) {
|
|
int t_hlen = tunnel->hlen + sizeof(struct iphdr);
|
|
|
|
dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
|
|
dev->mtu = tdev->mtu - t_hlen;
|
|
if (dev->mtu < IPV6_MIN_MTU)
|
|
dev->mtu = IPV6_MIN_MTU;
|
|
}
|
|
}
|
|
|
|
static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p,
|
|
__u32 fwmark)
|
|
{
|
|
struct net *net = t->net;
|
|
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->fwmark != fwmark) {
|
|
t->parms.link = p->link;
|
|
t->fwmark = fwmark;
|
|
ipip6_tunnel_bind_dev(t->dev);
|
|
}
|
|
dst_cache_reset(&t->dst_cache);
|
|
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;
|
|
dst_cache_reset(&t->dst_cache);
|
|
netdev_state_change(t->dev);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static bool ipip6_valid_ip_proto(u8 ipproto)
|
|
{
|
|
return ipproto == IPPROTO_IPV6 ||
|
|
ipproto == IPPROTO_IPIP ||
|
|
#if IS_ENABLED(CONFIG_MPLS)
|
|
ipproto == IPPROTO_MPLS ||
|
|
#endif
|
|
ipproto == 0;
|
|
}
|
|
|
|
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 = netdev_priv(dev);
|
|
struct net *net = t->net;
|
|
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
|
|
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)
|
|
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 (!ipip6_valid_ip_proto(p.iph.protocol))
|
|
goto done;
|
|
if (p.iph.version != 4 ||
|
|
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) {
|
|
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, t->fwmark);
|
|
}
|
|
|
|
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;
|
|
t = ipip6_tunnel_locate(net, &p, 0);
|
|
if (!t)
|
|
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 = 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;
|
|
|
|
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;
|
|
}
|
|
dst_cache_reset(&t->dst_cache);
|
|
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;
|
|
|
|
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 const struct net_device_ops ipip6_netdev_ops = {
|
|
.ndo_init = ipip6_tunnel_init,
|
|
.ndo_uninit = ipip6_tunnel_uninit,
|
|
.ndo_start_xmit = sit_tunnel_xmit,
|
|
.ndo_do_ioctl = ipip6_tunnel_ioctl,
|
|
.ndo_get_stats64 = ip_tunnel_get_stats64,
|
|
.ndo_get_iflink = ip_tunnel_get_iflink,
|
|
};
|
|
|
|
static void ipip6_dev_free(struct net_device *dev)
|
|
{
|
|
struct ip_tunnel *tunnel = netdev_priv(dev);
|
|
|
|
dst_cache_destroy(&tunnel->dst_cache);
|
|
free_percpu(dev->tstats);
|
|
}
|
|
|
|
#define SIT_FEATURES (NETIF_F_SG | \
|
|
NETIF_F_FRAGLIST | \
|
|
NETIF_F_HIGHDMA | \
|
|
NETIF_F_GSO_SOFTWARE | \
|
|
NETIF_F_HW_CSUM)
|
|
|
|
static void ipip6_tunnel_setup(struct net_device *dev)
|
|
{
|
|
struct ip_tunnel *tunnel = netdev_priv(dev);
|
|
int t_hlen = tunnel->hlen + sizeof(struct iphdr);
|
|
|
|
dev->netdev_ops = &ipip6_netdev_ops;
|
|
dev->needs_free_netdev = true;
|
|
dev->priv_destructor = ipip6_dev_free;
|
|
|
|
dev->type = ARPHRD_SIT;
|
|
dev->hard_header_len = LL_MAX_HEADER + t_hlen;
|
|
dev->mtu = ETH_DATA_LEN - t_hlen;
|
|
dev->min_mtu = IPV6_MIN_MTU;
|
|
dev->max_mtu = 0xFFF8 - t_hlen;
|
|
dev->flags = IFF_NOARP;
|
|
netif_keep_dst(dev);
|
|
dev->addr_len = 4;
|
|
dev->features |= NETIF_F_LLTX;
|
|
dev->features |= SIT_FEATURES;
|
|
dev->hw_features |= SIT_FEATURES;
|
|
}
|
|
|
|
static int ipip6_tunnel_init(struct net_device *dev)
|
|
{
|
|
struct ip_tunnel *tunnel = netdev_priv(dev);
|
|
int err;
|
|
|
|
tunnel->dev = dev;
|
|
tunnel->net = dev_net(dev);
|
|
strcpy(tunnel->parms.name, dev->name);
|
|
|
|
ipip6_tunnel_bind_dev(dev);
|
|
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
|
|
if (!dev->tstats)
|
|
return -ENOMEM;
|
|
|
|
err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
|
|
if (err) {
|
|
free_percpu(dev->tstats);
|
|
dev->tstats = NULL;
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __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);
|
|
|
|
iph->version = 4;
|
|
iph->protocol = IPPROTO_IPV6;
|
|
iph->ihl = 5;
|
|
iph->ttl = 64;
|
|
|
|
dev_hold(dev);
|
|
rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
|
|
}
|
|
|
|
static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
u8 proto;
|
|
|
|
if (!data || !data[IFLA_IPTUN_PROTO])
|
|
return 0;
|
|
|
|
proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
|
|
if (!ipip6_valid_ip_proto(proto))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ipip6_netlink_parms(struct nlattr *data[],
|
|
struct ip_tunnel_parm *parms,
|
|
__u32 *fwmark)
|
|
{
|
|
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]);
|
|
|
|
if (data[IFLA_IPTUN_PROTO])
|
|
parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
|
|
|
|
if (data[IFLA_IPTUN_FWMARK])
|
|
*fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
|
|
}
|
|
|
|
/* This function returns true when ENCAP attributes are present in the nl msg */
|
|
static bool ipip6_netlink_encap_parms(struct nlattr *data[],
|
|
struct ip_tunnel_encap *ipencap)
|
|
{
|
|
bool ret = false;
|
|
|
|
memset(ipencap, 0, sizeof(*ipencap));
|
|
|
|
if (!data)
|
|
return ret;
|
|
|
|
if (data[IFLA_IPTUN_ENCAP_TYPE]) {
|
|
ret = true;
|
|
ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
|
|
}
|
|
|
|
if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
|
|
ret = true;
|
|
ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
|
|
}
|
|
|
|
if (data[IFLA_IPTUN_ENCAP_SPORT]) {
|
|
ret = true;
|
|
ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
|
|
}
|
|
|
|
if (data[IFLA_IPTUN_ENCAP_DPORT]) {
|
|
ret = true;
|
|
ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#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;
|
|
ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]);
|
|
}
|
|
|
|
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;
|
|
struct ip_tunnel_encap ipencap;
|
|
#ifdef CONFIG_IPV6_SIT_6RD
|
|
struct ip_tunnel_6rd ip6rd;
|
|
#endif
|
|
int err;
|
|
|
|
nt = netdev_priv(dev);
|
|
|
|
if (ipip6_netlink_encap_parms(data, &ipencap)) {
|
|
err = ip_tunnel_encap_setup(nt, &ipencap);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
ipip6_netlink_parms(data, &nt->parms, &nt->fwmark);
|
|
|
|
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 = netdev_priv(dev);
|
|
struct ip_tunnel_parm p;
|
|
struct ip_tunnel_encap ipencap;
|
|
struct net *net = t->net;
|
|
struct sit_net *sitn = net_generic(net, sit_net_id);
|
|
#ifdef CONFIG_IPV6_SIT_6RD
|
|
struct ip_tunnel_6rd ip6rd;
|
|
#endif
|
|
__u32 fwmark = t->fwmark;
|
|
int err;
|
|
|
|
if (dev == sitn->fb_tunnel_dev)
|
|
return -EINVAL;
|
|
|
|
if (ipip6_netlink_encap_parms(data, &ipencap)) {
|
|
err = ip_tunnel_encap_setup(t, &ipencap);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
ipip6_netlink_parms(data, &p, &fwmark);
|
|
|
|
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, fwmark);
|
|
|
|
#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) +
|
|
/* IFLA_IPTUN_PROTO */
|
|
nla_total_size(1) +
|
|
#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
|
|
/* IFLA_IPTUN_ENCAP_TYPE */
|
|
nla_total_size(2) +
|
|
/* IFLA_IPTUN_ENCAP_FLAGS */
|
|
nla_total_size(2) +
|
|
/* IFLA_IPTUN_ENCAP_SPORT */
|
|
nla_total_size(2) +
|
|
/* IFLA_IPTUN_ENCAP_DPORT */
|
|
nla_total_size(2) +
|
|
/* IFLA_IPTUN_FWMARK */
|
|
nla_total_size(4) +
|
|
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_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
|
|
nla_put_in_addr(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_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
|
|
nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) ||
|
|
nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
|
|
goto nla_put_failure;
|
|
|
|
#ifdef CONFIG_IPV6_SIT_6RD
|
|
if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX,
|
|
&tunnel->ip6rd.prefix) ||
|
|
nla_put_in_addr(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
|
|
|
|
if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
|
|
tunnel->encap.type) ||
|
|
nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
|
|
tunnel->encap.sport) ||
|
|
nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
|
|
tunnel->encap.dport) ||
|
|
nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
|
|
tunnel->encap.flags))
|
|
goto nla_put_failure;
|
|
|
|
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 },
|
|
[IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
|
|
#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
|
|
[IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
|
|
[IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
|
|
[IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
|
|
[IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
|
|
[IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static void ipip6_dellink(struct net_device *dev, struct list_head *head)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
struct sit_net *sitn = net_generic(net, sit_net_id);
|
|
|
|
if (dev != sitn->fb_tunnel_dev)
|
|
unregister_netdevice_queue(dev, head);
|
|
}
|
|
|
|
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,
|
|
.validate = ipip6_validate,
|
|
.newlink = ipip6_newlink,
|
|
.changelink = ipip6_changelink,
|
|
.get_size = ipip6_get_size,
|
|
.fill_info = ipip6_fill_info,
|
|
.dellink = ipip6_dellink,
|
|
.get_link_net = ip_tunnel_get_link_net,
|
|
};
|
|
|
|
static struct xfrm_tunnel sit_handler __read_mostly = {
|
|
.handler = ipip6_rcv,
|
|
.err_handler = ipip6_err,
|
|
.priority = 1,
|
|
};
|
|
|
|
static struct xfrm_tunnel ipip_handler __read_mostly = {
|
|
.handler = ipip_rcv,
|
|
.err_handler = ipip6_err,
|
|
.priority = 2,
|
|
};
|
|
|
|
#if IS_ENABLED(CONFIG_MPLS)
|
|
static struct xfrm_tunnel mplsip_handler __read_mostly = {
|
|
.handler = mplsip_rcv,
|
|
.err_handler = ipip6_err,
|
|
.priority = 2,
|
|
};
|
|
#endif
|
|
|
|
static void __net_exit sit_destroy_tunnels(struct net *net,
|
|
struct list_head *head)
|
|
{
|
|
struct sit_net *sitn = net_generic(net, sit_net_id);
|
|
struct net_device *dev, *aux;
|
|
int prio;
|
|
|
|
for_each_netdev_safe(net, dev, aux)
|
|
if (dev->rtnl_link_ops == &sit_link_ops)
|
|
unregister_netdevice_queue(dev, head);
|
|
|
|
for (prio = 1; prio < 4; prio++) {
|
|
int h;
|
|
for (h = 0; h < IP6_SIT_HASH_SIZE; h++) {
|
|
struct ip_tunnel *t;
|
|
|
|
t = rtnl_dereference(sitn->tunnels[prio][h]);
|
|
while (t) {
|
|
/* If dev is in the same netns, it has already
|
|
* been added to the list by the previous loop.
|
|
*/
|
|
if (!net_eq(dev_net(t->dev), net))
|
|
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",
|
|
NET_NAME_UNKNOWN,
|
|
ipip6_tunnel_setup);
|
|
if (!sitn->fb_tunnel_dev) {
|
|
err = -ENOMEM;
|
|
goto err_alloc_dev;
|
|
}
|
|
dev_net_set(sitn->fb_tunnel_dev, net);
|
|
sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops;
|
|
/* FB netdevice is special: we have one, and only one per netns.
|
|
* Allowing to move it to another netns is clearly unsafe.
|
|
*/
|
|
sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
|
|
|
|
err = register_netdev(sitn->fb_tunnel_dev);
|
|
if (err)
|
|
goto err_reg_dev;
|
|
|
|
ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
|
|
ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
|
|
|
|
t = netdev_priv(sitn->fb_tunnel_dev);
|
|
|
|
strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
|
|
return 0;
|
|
|
|
err_reg_dev:
|
|
ipip6_dev_free(sitn->fb_tunnel_dev);
|
|
err_alloc_dev:
|
|
return err;
|
|
}
|
|
|
|
static void __net_exit sit_exit_net(struct net *net)
|
|
{
|
|
LIST_HEAD(list);
|
|
|
|
rtnl_lock();
|
|
sit_destroy_tunnels(net, &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);
|
|
xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
|
|
#if IS_ENABLED(CONFIG_MPLS)
|
|
xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
|
|
#endif
|
|
|
|
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, IPv4 and MPLS 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 register ip6ip4\n", __func__);
|
|
goto xfrm_tunnel_failed;
|
|
}
|
|
err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
|
|
if (err < 0) {
|
|
pr_info("%s: can't register ip4ip4\n", __func__);
|
|
goto xfrm_tunnel4_failed;
|
|
}
|
|
#if IS_ENABLED(CONFIG_MPLS)
|
|
err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
|
|
if (err < 0) {
|
|
pr_info("%s: can't register mplsip\n", __func__);
|
|
goto xfrm_tunnel_mpls_failed;
|
|
}
|
|
#endif
|
|
err = rtnl_link_register(&sit_link_ops);
|
|
if (err < 0)
|
|
goto rtnl_link_failed;
|
|
|
|
out:
|
|
return err;
|
|
|
|
rtnl_link_failed:
|
|
#if IS_ENABLED(CONFIG_MPLS)
|
|
xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
|
|
xfrm_tunnel_mpls_failed:
|
|
#endif
|
|
xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
|
|
xfrm_tunnel4_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_RTNL_LINK("sit");
|
|
MODULE_ALIAS_NETDEV("sit0");
|