![stephen hemminger](/assets/img/avatar_default.png)
Use be32_to_cpu instead of htonl to keep sparse happy. Signed-off-by: Stephen Hemminger <shemminger@vyatta.org> Signed-off-by: David S. Miller <davem@davemloft.net>
952 lines
22 KiB
C
952 lines
22 KiB
C
/*
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* Linux NET3: IP/IP protocol decoder modified to support
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* virtual tunnel interface
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*
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* Authors:
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* Saurabh Mohan (saurabh.mohan@vyatta.com) 05/07/2012
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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/*
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This version of net/ipv4/ip_vti.c is cloned of net/ipv4/ipip.c
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For comments look at net/ipv4/ip_gre.c --ANK
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*/
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#include <linux/capability.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/uaccess.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/in.h>
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#include <linux/tcp.h>
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#include <linux/udp.h>
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#include <linux/if_arp.h>
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#include <linux/mroute.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/ip.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/net_namespace.h>
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#include <net/netns/generic.h>
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#define HASH_SIZE 16
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#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&(HASH_SIZE-1))
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static struct rtnl_link_ops vti_link_ops __read_mostly;
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static int vti_net_id __read_mostly;
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struct vti_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 int vti_fb_tunnel_init(struct net_device *dev);
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static int vti_tunnel_init(struct net_device *dev);
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static void vti_tunnel_setup(struct net_device *dev);
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static void vti_dev_free(struct net_device *dev);
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static int vti_tunnel_bind_dev(struct net_device *dev);
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/* Locking : hash tables are protected by RCU and RTNL */
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#define for_each_ip_tunnel_rcu(start) \
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for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
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/* often modified stats are per cpu, other are shared (netdev->stats) */
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struct pcpu_tstats {
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u64 rx_packets;
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u64 rx_bytes;
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u64 tx_packets;
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u64 tx_bytes;
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struct u64_stats_sync syncp;
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};
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#define VTI_XMIT(stats1, stats2) do { \
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int err; \
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int pkt_len = skb->len; \
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err = dst_output(skb); \
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if (net_xmit_eval(err) == 0) { \
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u64_stats_update_begin(&(stats1)->syncp); \
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(stats1)->tx_bytes += pkt_len; \
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(stats1)->tx_packets++; \
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u64_stats_update_end(&(stats1)->syncp); \
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} else { \
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(stats2)->tx_errors++; \
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(stats2)->tx_aborted_errors++; \
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} \
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} while (0)
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static struct rtnl_link_stats64 *vti_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->multicast = dev->stats.multicast;
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tot->rx_crc_errors = dev->stats.rx_crc_errors;
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tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
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tot->rx_length_errors = dev->stats.rx_length_errors;
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tot->rx_errors = dev->stats.rx_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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static struct ip_tunnel *vti_tunnel_lookup(struct net *net,
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__be32 remote, __be32 local)
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{
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unsigned h0 = HASH(remote);
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unsigned h1 = HASH(local);
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struct ip_tunnel *t;
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struct vti_net *ipn = net_generic(net, vti_net_id);
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for_each_ip_tunnel_rcu(ipn->tunnels_r_l[h0 ^ h1])
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if (local == t->parms.iph.saddr &&
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remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
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return t;
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for_each_ip_tunnel_rcu(ipn->tunnels_r[h0])
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if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
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return t;
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for_each_ip_tunnel_rcu(ipn->tunnels_l[h1])
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if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
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return t;
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for_each_ip_tunnel_rcu(ipn->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 **__vti_bucket(struct vti_net *ipn,
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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 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 &ipn->tunnels[prio][h];
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}
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static inline struct ip_tunnel __rcu **vti_bucket(struct vti_net *ipn,
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struct ip_tunnel *t)
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{
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return __vti_bucket(ipn, &t->parms);
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}
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static void vti_tunnel_unlink(struct vti_net *ipn, 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 = vti_bucket(ipn, 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 vti_tunnel_link(struct vti_net *ipn, struct ip_tunnel *t)
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{
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struct ip_tunnel __rcu **tp = vti_bucket(ipn, 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 struct ip_tunnel *vti_tunnel_locate(struct net *net,
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struct ip_tunnel_parm *parms,
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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 vti_net *ipn = net_generic(net, vti_net_id);
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for (tp = __vti_bucket(ipn, 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 && remote == t->parms.iph.daddr)
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return t;
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}
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if (!create)
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return NULL;
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if (parms->name[0])
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strlcpy(name, parms->name, IFNAMSIZ);
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else
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strcpy(name, "vti%d");
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dev = alloc_netdev(sizeof(*t), name, vti_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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dev->rtnl_link_ops = &vti_link_ops;
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vti_tunnel_bind_dev(dev);
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if (register_netdevice(dev) < 0)
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goto failed_free;
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dev_hold(dev);
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vti_tunnel_link(ipn, nt);
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return nt;
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failed_free:
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free_netdev(dev);
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return NULL;
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}
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static void vti_tunnel_uninit(struct net_device *dev)
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{
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struct net *net = dev_net(dev);
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struct vti_net *ipn = net_generic(net, vti_net_id);
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vti_tunnel_unlink(ipn, netdev_priv(dev));
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dev_put(dev);
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}
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static int vti_err(struct sk_buff *skb, u32 info)
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{
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/* All the routers (except for Linux) return only
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* 8 bytes of packet payload. It means, that precise relaying of
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* ICMP in the real Internet is absolutely infeasible.
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*/
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struct iphdr *iph = (struct iphdr *)skb->data;
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const int type = icmp_hdr(skb)->type;
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const int code = icmp_hdr(skb)->code;
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struct ip_tunnel *t;
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int err;
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switch (type) {
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default:
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case ICMP_PARAMETERPROB:
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return 0;
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case ICMP_DEST_UNREACH:
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switch (code) {
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case ICMP_SR_FAILED:
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case ICMP_PORT_UNREACH:
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/* Impossible event. */
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return 0;
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default:
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/* All others are translated to HOST_UNREACH. */
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break;
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}
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break;
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case ICMP_TIME_EXCEEDED:
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if (code != ICMP_EXC_TTL)
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return 0;
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break;
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}
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err = -ENOENT;
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t = vti_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr);
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if (t == NULL)
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goto out;
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if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
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ipv4_update_pmtu(skb, dev_net(skb->dev), info,
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t->parms.link, 0, IPPROTO_IPIP, 0);
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err = 0;
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goto out;
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}
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err = 0;
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if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
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goto out;
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if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
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t->err_count++;
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else
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t->err_count = 1;
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t->err_time = jiffies;
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out:
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return err;
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}
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/* We dont digest the packet therefore let the packet pass */
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static int vti_rcv(struct sk_buff *skb)
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{
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struct ip_tunnel *tunnel;
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const struct iphdr *iph = ip_hdr(skb);
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tunnel = vti_tunnel_lookup(dev_net(skb->dev), iph->saddr, iph->daddr);
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if (tunnel != NULL) {
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struct pcpu_tstats *tstats;
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tstats = this_cpu_ptr(tunnel->dev->tstats);
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u64_stats_update_begin(&tstats->syncp);
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tstats->rx_packets++;
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tstats->rx_bytes += skb->len;
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u64_stats_update_end(&tstats->syncp);
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skb->dev = tunnel->dev;
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return 1;
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}
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return -1;
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}
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/* This function assumes it is being called from dev_queue_xmit()
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* and that skb is filled properly by that function.
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*/
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static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct ip_tunnel *tunnel = netdev_priv(dev);
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struct pcpu_tstats *tstats;
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struct iphdr *tiph = &tunnel->parms.iph;
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u8 tos;
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struct rtable *rt; /* Route to the other host */
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struct net_device *tdev; /* Device to other host */
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struct iphdr *old_iph = ip_hdr(skb);
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__be32 dst = tiph->daddr;
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struct flowi4 fl4;
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if (skb->protocol != htons(ETH_P_IP))
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goto tx_error;
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tos = old_iph->tos;
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memset(&fl4, 0, sizeof(fl4));
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flowi4_init_output(&fl4, tunnel->parms.link,
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be32_to_cpu(tunnel->parms.i_key), RT_TOS(tos),
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RT_SCOPE_UNIVERSE,
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IPPROTO_IPIP, 0,
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dst, tiph->saddr, 0, 0);
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rt = ip_route_output_key(dev_net(dev), &fl4);
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if (IS_ERR(rt)) {
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dev->stats.tx_carrier_errors++;
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goto tx_error_icmp;
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}
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/* if there is no transform then this tunnel is not functional.
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* Or if the xfrm is not mode tunnel.
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*/
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if (!rt->dst.xfrm ||
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rt->dst.xfrm->props.mode != XFRM_MODE_TUNNEL) {
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dev->stats.tx_carrier_errors++;
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goto tx_error_icmp;
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}
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tdev = rt->dst.dev;
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if (tdev == dev) {
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ip_rt_put(rt);
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dev->stats.collisions++;
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goto tx_error;
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}
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if (tunnel->err_count > 0) {
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if (time_before(jiffies,
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tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
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tunnel->err_count--;
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dst_link_failure(skb);
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} else
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tunnel->err_count = 0;
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}
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IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
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IPSKB_REROUTED);
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skb_dst_drop(skb);
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skb_dst_set(skb, &rt->dst);
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nf_reset(skb);
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skb->dev = skb_dst(skb)->dev;
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tstats = this_cpu_ptr(dev->tstats);
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VTI_XMIT(tstats, &dev->stats);
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return NETDEV_TX_OK;
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tx_error_icmp:
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dst_link_failure(skb);
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tx_error:
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dev->stats.tx_errors++;
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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static int vti_tunnel_bind_dev(struct net_device *dev)
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{
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struct net_device *tdev = NULL;
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struct ip_tunnel *tunnel;
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struct iphdr *iph;
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tunnel = netdev_priv(dev);
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iph = &tunnel->parms.iph;
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if (iph->daddr) {
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struct rtable *rt;
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struct flowi4 fl4;
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memset(&fl4, 0, sizeof(fl4));
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flowi4_init_output(&fl4, tunnel->parms.link,
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be32_to_cpu(tunnel->parms.i_key),
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RT_TOS(iph->tos), RT_SCOPE_UNIVERSE,
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IPPROTO_IPIP, 0,
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iph->daddr, iph->saddr, 0, 0);
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rt = ip_route_output_key(dev_net(dev), &fl4);
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if (!IS_ERR(rt)) {
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tdev = rt->dst.dev;
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ip_rt_put(rt);
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}
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dev->flags |= IFF_POINTOPOINT;
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}
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if (!tdev && tunnel->parms.link)
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tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
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if (tdev) {
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dev->hard_header_len = tdev->hard_header_len +
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sizeof(struct iphdr);
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dev->mtu = tdev->mtu;
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}
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dev->iflink = tunnel->parms.link;
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return dev->mtu;
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}
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static int
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vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
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{
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int err = 0;
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struct ip_tunnel_parm p;
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struct ip_tunnel *t;
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struct net *net = dev_net(dev);
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struct vti_net *ipn = net_generic(net, vti_net_id);
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switch (cmd) {
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case SIOCGETTUNNEL:
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t = NULL;
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if (dev == ipn->fb_tunnel_dev) {
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if (copy_from_user(&p, ifr->ifr_ifru.ifru_data,
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sizeof(p))) {
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err = -EFAULT;
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break;
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}
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t = vti_tunnel_locate(net, &p, 0);
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}
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if (t == NULL)
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t = netdev_priv(dev);
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memcpy(&p, &t->parms, sizeof(p));
|
|
p.i_flags |= GRE_KEY | VTI_ISVTI;
|
|
p.o_flags |= GRE_KEY;
|
|
if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
|
|
err = -EFAULT;
|
|
break;
|
|
|
|
case SIOCADDTUNNEL:
|
|
case SIOCCHGTUNNEL:
|
|
err = -EPERM;
|
|
if (!capable(CAP_NET_ADMIN))
|
|
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_IPIP ||
|
|
p.iph.ihl != 5)
|
|
goto done;
|
|
|
|
t = vti_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
|
|
|
|
if (dev != ipn->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);
|
|
vti_tunnel_unlink(ipn, t);
|
|
synchronize_net();
|
|
t->parms.iph.saddr = p.iph.saddr;
|
|
t->parms.iph.daddr = p.iph.daddr;
|
|
t->parms.i_key = p.i_key;
|
|
t->parms.o_key = p.o_key;
|
|
t->parms.iph.protocol = IPPROTO_IPIP;
|
|
memcpy(dev->dev_addr, &p.iph.saddr, 4);
|
|
memcpy(dev->broadcast, &p.iph.daddr, 4);
|
|
vti_tunnel_link(ipn, t);
|
|
netdev_state_change(dev);
|
|
}
|
|
}
|
|
|
|
if (t) {
|
|
err = 0;
|
|
if (cmd == SIOCCHGTUNNEL) {
|
|
t->parms.i_key = p.i_key;
|
|
t->parms.o_key = p.o_key;
|
|
if (t->parms.link != p.link) {
|
|
t->parms.link = p.link;
|
|
vti_tunnel_bind_dev(dev);
|
|
netdev_state_change(dev);
|
|
}
|
|
}
|
|
p.i_flags |= GRE_KEY | VTI_ISVTI;
|
|
p.o_flags |= GRE_KEY;
|
|
if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms,
|
|
sizeof(p)))
|
|
err = -EFAULT;
|
|
} else
|
|
err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
|
|
break;
|
|
|
|
case SIOCDELTUNNEL:
|
|
err = -EPERM;
|
|
if (!capable(CAP_NET_ADMIN))
|
|
goto done;
|
|
|
|
if (dev == ipn->fb_tunnel_dev) {
|
|
err = -EFAULT;
|
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data,
|
|
sizeof(p)))
|
|
goto done;
|
|
err = -ENOENT;
|
|
|
|
t = vti_tunnel_locate(net, &p, 0);
|
|
if (t == NULL)
|
|
goto done;
|
|
err = -EPERM;
|
|
if (t->dev == ipn->fb_tunnel_dev)
|
|
goto done;
|
|
dev = t->dev;
|
|
}
|
|
unregister_netdevice(dev);
|
|
err = 0;
|
|
break;
|
|
|
|
default:
|
|
err = -EINVAL;
|
|
}
|
|
|
|
done:
|
|
return err;
|
|
}
|
|
|
|
static int vti_tunnel_change_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
if (new_mtu < 68 || new_mtu > 0xFFF8)
|
|
return -EINVAL;
|
|
dev->mtu = new_mtu;
|
|
return 0;
|
|
}
|
|
|
|
static const struct net_device_ops vti_netdev_ops = {
|
|
.ndo_init = vti_tunnel_init,
|
|
.ndo_uninit = vti_tunnel_uninit,
|
|
.ndo_start_xmit = vti_tunnel_xmit,
|
|
.ndo_do_ioctl = vti_tunnel_ioctl,
|
|
.ndo_change_mtu = vti_tunnel_change_mtu,
|
|
.ndo_get_stats64 = vti_get_stats64,
|
|
};
|
|
|
|
static void vti_dev_free(struct net_device *dev)
|
|
{
|
|
free_percpu(dev->tstats);
|
|
free_netdev(dev);
|
|
}
|
|
|
|
static void vti_tunnel_setup(struct net_device *dev)
|
|
{
|
|
dev->netdev_ops = &vti_netdev_ops;
|
|
dev->destructor = vti_dev_free;
|
|
|
|
dev->type = ARPHRD_TUNNEL;
|
|
dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
|
|
dev->mtu = ETH_DATA_LEN;
|
|
dev->flags = IFF_NOARP;
|
|
dev->iflink = 0;
|
|
dev->addr_len = 4;
|
|
dev->features |= NETIF_F_NETNS_LOCAL;
|
|
dev->features |= NETIF_F_LLTX;
|
|
dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
|
|
}
|
|
|
|
static int vti_tunnel_init(struct net_device *dev)
|
|
{
|
|
struct ip_tunnel *tunnel = netdev_priv(dev);
|
|
|
|
tunnel->dev = dev;
|
|
strcpy(tunnel->parms.name, dev->name);
|
|
|
|
memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
|
|
memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
|
|
|
|
dev->tstats = alloc_percpu(struct pcpu_tstats);
|
|
if (!dev->tstats)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __net_init vti_fb_tunnel_init(struct net_device *dev)
|
|
{
|
|
struct ip_tunnel *tunnel = netdev_priv(dev);
|
|
struct iphdr *iph = &tunnel->parms.iph;
|
|
struct vti_net *ipn = net_generic(dev_net(dev), vti_net_id);
|
|
|
|
tunnel->dev = dev;
|
|
strcpy(tunnel->parms.name, dev->name);
|
|
|
|
iph->version = 4;
|
|
iph->protocol = IPPROTO_IPIP;
|
|
iph->ihl = 5;
|
|
|
|
dev->tstats = alloc_percpu(struct pcpu_tstats);
|
|
if (!dev->tstats)
|
|
return -ENOMEM;
|
|
|
|
dev_hold(dev);
|
|
rcu_assign_pointer(ipn->tunnels_wc[0], tunnel);
|
|
return 0;
|
|
}
|
|
|
|
static struct xfrm_tunnel vti_handler __read_mostly = {
|
|
.handler = vti_rcv,
|
|
.err_handler = vti_err,
|
|
.priority = 1,
|
|
};
|
|
|
|
static void vti_destroy_tunnels(struct vti_net *ipn, 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(ipn->tunnels[prio][h]);
|
|
while (t != NULL) {
|
|
unregister_netdevice_queue(t->dev, head);
|
|
t = rtnl_dereference(t->next);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int __net_init vti_init_net(struct net *net)
|
|
{
|
|
int err;
|
|
struct vti_net *ipn = net_generic(net, vti_net_id);
|
|
|
|
ipn->tunnels[0] = ipn->tunnels_wc;
|
|
ipn->tunnels[1] = ipn->tunnels_l;
|
|
ipn->tunnels[2] = ipn->tunnels_r;
|
|
ipn->tunnels[3] = ipn->tunnels_r_l;
|
|
|
|
ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel),
|
|
"ip_vti0",
|
|
vti_tunnel_setup);
|
|
if (!ipn->fb_tunnel_dev) {
|
|
err = -ENOMEM;
|
|
goto err_alloc_dev;
|
|
}
|
|
dev_net_set(ipn->fb_tunnel_dev, net);
|
|
|
|
err = vti_fb_tunnel_init(ipn->fb_tunnel_dev);
|
|
if (err)
|
|
goto err_reg_dev;
|
|
ipn->fb_tunnel_dev->rtnl_link_ops = &vti_link_ops;
|
|
|
|
err = register_netdev(ipn->fb_tunnel_dev);
|
|
if (err)
|
|
goto err_reg_dev;
|
|
return 0;
|
|
|
|
err_reg_dev:
|
|
vti_dev_free(ipn->fb_tunnel_dev);
|
|
err_alloc_dev:
|
|
/* nothing */
|
|
return err;
|
|
}
|
|
|
|
static void __net_exit vti_exit_net(struct net *net)
|
|
{
|
|
struct vti_net *ipn = net_generic(net, vti_net_id);
|
|
LIST_HEAD(list);
|
|
|
|
rtnl_lock();
|
|
vti_destroy_tunnels(ipn, &list);
|
|
unregister_netdevice_many(&list);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static struct pernet_operations vti_net_ops = {
|
|
.init = vti_init_net,
|
|
.exit = vti_exit_net,
|
|
.id = &vti_net_id,
|
|
.size = sizeof(struct vti_net),
|
|
};
|
|
|
|
static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void vti_netlink_parms(struct nlattr *data[],
|
|
struct ip_tunnel_parm *parms)
|
|
{
|
|
memset(parms, 0, sizeof(*parms));
|
|
|
|
parms->iph.protocol = IPPROTO_IPIP;
|
|
|
|
if (!data)
|
|
return;
|
|
|
|
if (data[IFLA_VTI_LINK])
|
|
parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
|
|
|
|
if (data[IFLA_VTI_IKEY])
|
|
parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
|
|
|
|
if (data[IFLA_VTI_OKEY])
|
|
parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
|
|
|
|
if (data[IFLA_VTI_LOCAL])
|
|
parms->iph.saddr = nla_get_be32(data[IFLA_VTI_LOCAL]);
|
|
|
|
if (data[IFLA_VTI_REMOTE])
|
|
parms->iph.daddr = nla_get_be32(data[IFLA_VTI_REMOTE]);
|
|
|
|
}
|
|
|
|
static int vti_newlink(struct net *src_net, struct net_device *dev,
|
|
struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
struct ip_tunnel *nt;
|
|
struct net *net = dev_net(dev);
|
|
struct vti_net *ipn = net_generic(net, vti_net_id);
|
|
int mtu;
|
|
int err;
|
|
|
|
nt = netdev_priv(dev);
|
|
vti_netlink_parms(data, &nt->parms);
|
|
|
|
if (vti_tunnel_locate(net, &nt->parms, 0))
|
|
return -EEXIST;
|
|
|
|
mtu = vti_tunnel_bind_dev(dev);
|
|
if (!tb[IFLA_MTU])
|
|
dev->mtu = mtu;
|
|
|
|
err = register_netdevice(dev);
|
|
if (err)
|
|
goto out;
|
|
|
|
dev_hold(dev);
|
|
vti_tunnel_link(ipn, nt);
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
|
|
struct nlattr *data[])
|
|
{
|
|
struct ip_tunnel *t, *nt;
|
|
struct net *net = dev_net(dev);
|
|
struct vti_net *ipn = net_generic(net, vti_net_id);
|
|
struct ip_tunnel_parm p;
|
|
int mtu;
|
|
|
|
if (dev == ipn->fb_tunnel_dev)
|
|
return -EINVAL;
|
|
|
|
nt = netdev_priv(dev);
|
|
vti_netlink_parms(data, &p);
|
|
|
|
t = vti_tunnel_locate(net, &p, 0);
|
|
|
|
if (t) {
|
|
if (t->dev != dev)
|
|
return -EEXIST;
|
|
} else {
|
|
t = nt;
|
|
|
|
vti_tunnel_unlink(ipn, t);
|
|
t->parms.iph.saddr = p.iph.saddr;
|
|
t->parms.iph.daddr = p.iph.daddr;
|
|
t->parms.i_key = p.i_key;
|
|
t->parms.o_key = p.o_key;
|
|
if (dev->type != ARPHRD_ETHER) {
|
|
memcpy(dev->dev_addr, &p.iph.saddr, 4);
|
|
memcpy(dev->broadcast, &p.iph.daddr, 4);
|
|
}
|
|
vti_tunnel_link(ipn, t);
|
|
netdev_state_change(dev);
|
|
}
|
|
|
|
if (t->parms.link != p.link) {
|
|
t->parms.link = p.link;
|
|
mtu = vti_tunnel_bind_dev(dev);
|
|
if (!tb[IFLA_MTU])
|
|
dev->mtu = mtu;
|
|
netdev_state_change(dev);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static size_t vti_get_size(const struct net_device *dev)
|
|
{
|
|
return
|
|
/* IFLA_VTI_LINK */
|
|
nla_total_size(4) +
|
|
/* IFLA_VTI_IKEY */
|
|
nla_total_size(4) +
|
|
/* IFLA_VTI_OKEY */
|
|
nla_total_size(4) +
|
|
/* IFLA_VTI_LOCAL */
|
|
nla_total_size(4) +
|
|
/* IFLA_VTI_REMOTE */
|
|
nla_total_size(4) +
|
|
0;
|
|
}
|
|
|
|
static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
|
|
{
|
|
struct ip_tunnel *t = netdev_priv(dev);
|
|
struct ip_tunnel_parm *p = &t->parms;
|
|
|
|
nla_put_u32(skb, IFLA_VTI_LINK, p->link);
|
|
nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key);
|
|
nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key);
|
|
nla_put_be32(skb, IFLA_VTI_LOCAL, p->iph.saddr);
|
|
nla_put_be32(skb, IFLA_VTI_REMOTE, p->iph.daddr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
|
|
[IFLA_VTI_LINK] = { .type = NLA_U32 },
|
|
[IFLA_VTI_IKEY] = { .type = NLA_U32 },
|
|
[IFLA_VTI_OKEY] = { .type = NLA_U32 },
|
|
[IFLA_VTI_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
|
|
[IFLA_VTI_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
|
|
};
|
|
|
|
static struct rtnl_link_ops vti_link_ops __read_mostly = {
|
|
.kind = "vti",
|
|
.maxtype = IFLA_VTI_MAX,
|
|
.policy = vti_policy,
|
|
.priv_size = sizeof(struct ip_tunnel),
|
|
.setup = vti_tunnel_setup,
|
|
.validate = vti_tunnel_validate,
|
|
.newlink = vti_newlink,
|
|
.changelink = vti_changelink,
|
|
.get_size = vti_get_size,
|
|
.fill_info = vti_fill_info,
|
|
};
|
|
|
|
static int __init vti_init(void)
|
|
{
|
|
int err;
|
|
|
|
pr_info("IPv4 over IPSec tunneling driver\n");
|
|
|
|
err = register_pernet_device(&vti_net_ops);
|
|
if (err < 0)
|
|
return err;
|
|
err = xfrm4_mode_tunnel_input_register(&vti_handler);
|
|
if (err < 0) {
|
|
unregister_pernet_device(&vti_net_ops);
|
|
pr_info(KERN_INFO "vti init: can't register tunnel\n");
|
|
}
|
|
|
|
err = rtnl_link_register(&vti_link_ops);
|
|
if (err < 0)
|
|
goto rtnl_link_failed;
|
|
|
|
return err;
|
|
|
|
rtnl_link_failed:
|
|
xfrm4_mode_tunnel_input_deregister(&vti_handler);
|
|
unregister_pernet_device(&vti_net_ops);
|
|
return err;
|
|
}
|
|
|
|
static void __exit vti_fini(void)
|
|
{
|
|
rtnl_link_unregister(&vti_link_ops);
|
|
if (xfrm4_mode_tunnel_input_deregister(&vti_handler))
|
|
pr_info("vti close: can't deregister tunnel\n");
|
|
|
|
unregister_pernet_device(&vti_net_ops);
|
|
}
|
|
|
|
module_init(vti_init);
|
|
module_exit(vti_fini);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_RTNL_LINK("vti");
|
|
MODULE_ALIAS_NETDEV("ip_vti0");
|