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Message-ID: <20120608173253.GA11962@debian-saurabh-64.vyatta.com>
Date: Fri, 8 Jun 2012 10:32:53 -0700
From: Saurabh <saurabh.mohan@...tta.com>
To: netdev@...r.kernel.org
Subject: [net-next PATCH 02/02] net/ipv4: VTI support new module for ip_vti.
New VTI tunnel kernel module, Kconfig and Makefile changes.
Signed-off-by: Saurabh Mohan <saurabh.mohan@...tta.com>
Reviewed-by: Stephen Hemminger <shemminger@...tta.com>
---
diff --git a/include/linux/if_tunnel.h b/include/linux/if_tunnel.h
index 16b92d0..4b4ce17 100644
--- a/include/linux/if_tunnel.h
+++ b/include/linux/if_tunnel.h
@@ -80,4 +80,15 @@ enum {
#define IFLA_GRE_MAX (__IFLA_GRE_MAX - 1)
+enum {
+ IFLA_VTI_UNSPEC,
+ IFLA_VTI_LINK,
+ IFLA_VTI_IKEY,
+ IFLA_VTI_OKEY,
+ IFLA_VTI_LOCAL,
+ IFLA_VTI_REMOTE,
+ __IFLA_VTI_MAX,
+};
+
+#define IFLA_VTI_MAX (__IFLA_VTI_MAX - 1)
#endif /* _IF_TUNNEL_H_ */
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 20f1cb5..3a95308 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -310,6 +310,20 @@ config SYN_COOKIES
If unsure, say N.
+config NET_IPVTI
+ tristate "Virtual (secure) IP: tunneling"
+ select INET_TUNNEL
+ ---help---
+ Tunneling means encapsulating data of one protocol type within
+ another protocol and sending it over a channel that understands the
+ Pencapsulating protocol. This particular tunneling driver implements
+ encapsulation of IP within IP-ESP. This can be used with xfrm to give
+ the notion of a secure tunnel and then use routing protocol on top.
+
+ Saying Y to this option will produce one module ( = code which can
+ be inserted in and removed from the running kernel whenever you
+ want). Most people won't need this and can say N.
+
config INET_AH
tristate "IP: AH transformation"
select XFRM_ALGO
diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index ff75d3b..3999ce9 100644
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_IP_MROUTE) += ipmr.o
obj-$(CONFIG_NET_IPIP) += ipip.o
obj-$(CONFIG_NET_IPGRE_DEMUX) += gre.o
obj-$(CONFIG_NET_IPGRE) += ip_gre.o
+obj-$(CONFIG_NET_IPVTI) += ip_vti.o
obj-$(CONFIG_SYN_COOKIES) += syncookies.o
obj-$(CONFIG_INET_AH) += ah4.o
obj-$(CONFIG_INET_ESP) += esp4.o
diff --git a/net/ipv4/ip_vti.c b/net/ipv4/ip_vti.c
new file mode 100644
index 0000000..3eaa47c
--- /dev/null
+++ b/net/ipv4/ip_vti.c
@@ -0,0 +1,980 @@
+/*
+ * Linux NET3: IP/IP protocol decoder modified to support virtual tunnel interface
+ *
+ * Authors:
+ * Sam Lantinga (slouken@...ucdavis.edu) 02/01/95
+ * Saurabh Mohan (saurabh.mohan@...tta.com) 05/07/2012
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+/*
+ This version of net/ipv4/ip_vti.c is cloned of net/ipv4/ipip.c
+
+ For comments look at net/ipv4/ip_gre.c --ANK
+ */
+
+
+#include <linux/capability.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/uaccess.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/in.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/if_arp.h>
+#include <linux/mroute.h>
+#include <linux/init.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/if_ether.h>
+
+#include <net/sock.h>
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/ipip.h>
+#include <net/inet_ecn.h>
+#include <net/xfrm.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+
+#define HASH_SIZE 16
+#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
+
+static struct rtnl_link_ops vti_link_ops __read_mostly;
+
+static int vti_net_id __read_mostly;
+struct vti_net {
+ struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
+ struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
+ struct ip_tunnel __rcu *tunnels_l[HASH_SIZE];
+ struct ip_tunnel __rcu *tunnels_wc[1];
+ struct ip_tunnel **tunnels[4];
+
+ struct net_device *fb_tunnel_dev;
+};
+
+static int vti_fb_tunnel_init(struct net_device *dev);
+static int vti_tunnel_init(struct net_device *dev);
+static void vti_tunnel_setup(struct net_device *dev);
+static void vti_dev_free(struct net_device *dev);
+static int vti_tunnel_bind_dev(struct net_device *dev);
+
+/*
+ * Locking : hash tables are protected by RCU and RTNL
+ */
+
+#define for_each_ip_tunnel_rcu(start) \
+ for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
+
+/* often modified stats are per cpu, other are shared (netdev->stats) */
+struct pcpu_tstats {
+ u64 rx_packets;
+ u64 rx_bytes;
+ u64 tx_packets;
+ u64 tx_bytes;
+ struct u64_stats_sync syncp;
+};
+
+#define VTI_XMIT(stats1, stats2) do { \
+ int err; \
+ int pkt_len = skb->len; \
+ err = dst_output(skb); \
+ if (net_xmit_eval(err) == 0) { \
+ (stats1)->tx_bytes += pkt_len; \
+ (stats1)->tx_packets++; \
+ } else { \
+ (stats2)->tx_errors++; \
+ (stats2)->tx_aborted_errors++; \
+ } \
+} while (0)
+
+
+static struct rtnl_link_stats64 *vti_get_stats64(struct net_device *dev,
+ struct rtnl_link_stats64 *tot)
+{
+ int i;
+
+ for_each_possible_cpu(i) {
+ const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
+ u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
+ unsigned int start;
+
+ do {
+ start = u64_stats_fetch_begin_bh(&tstats->syncp);
+ rx_packets = tstats->rx_packets;
+ tx_packets = tstats->tx_packets;
+ rx_bytes = tstats->rx_bytes;
+ tx_bytes = tstats->tx_bytes;
+ } while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
+
+ tot->rx_packets += rx_packets;
+ tot->tx_packets += tx_packets;
+ tot->rx_bytes += rx_bytes;
+ tot->tx_bytes += tx_bytes;
+ }
+
+ tot->multicast = dev->stats.multicast;
+ tot->rx_crc_errors = dev->stats.rx_crc_errors;
+ tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
+ tot->rx_length_errors = dev->stats.rx_length_errors;
+ tot->rx_errors = dev->stats.rx_errors;
+ tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
+ tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
+ tot->tx_dropped = dev->stats.tx_dropped;
+ tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
+ tot->tx_errors = dev->stats.tx_errors;
+
+ return tot;
+}
+
+static struct ip_tunnel *vti_tunnel_lookup(struct net *net,
+ __be32 remote, __be32 local)
+{
+ unsigned h0 = HASH(remote);
+ unsigned h1 = HASH(local);
+ struct ip_tunnel *t;
+ struct vti_net *ipn = net_generic(net, vti_net_id);
+
+ for_each_ip_tunnel_rcu(ipn->tunnels_r_l[h0 ^ h1])
+ if (local == t->parms.iph.saddr &&
+ remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
+ return t;
+ for_each_ip_tunnel_rcu(ipn->tunnels_r[h0])
+ if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
+ return t;
+
+ for_each_ip_tunnel_rcu(ipn->tunnels_l[h1])
+ if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
+ return t;
+
+ for_each_ip_tunnel_rcu(ipn->tunnels_wc[0])
+ if (t && (t->dev->flags&IFF_UP))
+ return t;
+ return NULL;
+}
+
+static struct ip_tunnel **__vti_bucket(struct vti_net *ipn,
+ struct ip_tunnel_parm *parms)
+{
+ __be32 remote = parms->iph.daddr;
+ __be32 local = parms->iph.saddr;
+ unsigned h = 0;
+ int prio = 0;
+
+ if (remote) {
+ prio |= 2;
+ h ^= HASH(remote);
+ }
+ if (local) {
+ prio |= 1;
+ h ^= HASH(local);
+ }
+ return &ipn->tunnels[prio][h];
+}
+
+static inline struct ip_tunnel **vti_bucket(struct vti_net *ipn,
+ struct ip_tunnel *t)
+{
+ return __vti_bucket(ipn, &t->parms);
+}
+
+static void vti_tunnel_unlink(struct vti_net *ipn, struct ip_tunnel *t)
+{
+ struct ip_tunnel __rcu **tp;
+ struct ip_tunnel *iter;
+
+ for (tp = vti_bucket(ipn, t);
+ (iter = rtnl_dereference(*tp)) != NULL;
+ tp = &iter->next) {
+ if (t == iter) {
+ rcu_assign_pointer(*tp, t->next);
+ break;
+ }
+ }
+}
+
+static void vti_tunnel_link(struct vti_net *ipn, struct ip_tunnel *t)
+{
+ struct ip_tunnel __rcu **tp = vti_bucket(ipn, t);
+
+ rcu_assign_pointer(t->next, rtnl_dereference(*tp));
+ rcu_assign_pointer(*tp, t);
+}
+
+static struct ip_tunnel *vti_tunnel_locate(struct net *net,
+ struct ip_tunnel_parm *parms,
+ int create)
+{
+ __be32 remote = parms->iph.daddr;
+ __be32 local = parms->iph.saddr;
+ struct ip_tunnel *t, *nt;
+ struct ip_tunnel __rcu **tp;
+ struct net_device *dev;
+ char name[IFNAMSIZ];
+ struct vti_net *ipn = net_generic(net, vti_net_id);
+
+ for (tp = __vti_bucket(ipn, parms);
+ (t = rtnl_dereference(*tp)) != NULL;
+ tp = &t->next) {
+ if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
+ return t;
+ }
+ if (!create)
+ return NULL;
+
+ if (parms->name[0])
+ strlcpy(name, parms->name, IFNAMSIZ);
+ else
+ strcpy(name, "vti%d");
+
+ dev = alloc_netdev(sizeof(*t), name, vti_tunnel_setup);
+ if (dev == NULL)
+ return NULL;
+
+ dev_net_set(dev, net);
+
+ nt = netdev_priv(dev);
+ nt->parms = *parms;
+ dev->rtnl_link_ops = &vti_link_ops;
+
+ vti_tunnel_bind_dev(dev);
+
+ if (register_netdevice(dev) < 0)
+ goto failed_free;
+
+ dev_hold(dev);
+ vti_tunnel_link(ipn, nt);
+ return nt;
+
+ failed_free:
+ free_netdev(dev);
+ return NULL;
+}
+
+static void vti_tunnel_uninit(struct net_device *dev)
+{
+ struct net *net = dev_net(dev);
+ struct vti_net *ipn = net_generic(net, vti_net_id);
+
+ if (dev == ipn->fb_tunnel_dev)
+ RCU_INIT_POINTER(ipn->tunnels_wc[0], NULL);
+ else
+ vti_tunnel_unlink(ipn, netdev_priv(dev));
+ dev_put(dev);
+}
+
+static int vti_err(struct sk_buff *skb, u32 info)
+{
+
+ /* All the routers (except for Linux) return only
+ * 8 bytes of packet payload. It means, that precise relaying of
+ * ICMP in the real Internet is absolutely infeasible.
+ */
+ struct iphdr *iph = (struct iphdr *)skb->data;
+ const int type = icmp_hdr(skb)->type;
+ const int code = icmp_hdr(skb)->code;
+ struct ip_tunnel *t;
+ int err;
+
+ switch (type) {
+ default:
+ case ICMP_PARAMETERPROB:
+ return 0;
+
+ case ICMP_DEST_UNREACH:
+ switch (code) {
+ case ICMP_SR_FAILED:
+ case ICMP_PORT_UNREACH:
+ /* Impossible event. */
+ return 0;
+ case ICMP_FRAG_NEEDED:
+ /* Soft state for pmtu is maintained by IP core. */
+ return 0;
+ default:
+ /* All others are translated to HOST_UNREACH. */
+ break;
+ }
+ break;
+ case ICMP_TIME_EXCEEDED:
+ if (code != ICMP_EXC_TTL)
+ return 0;
+ break;
+ }
+
+ err = -ENOENT;
+
+ rcu_read_lock();
+ t = vti_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr);
+ if (t == NULL || t->parms.iph.daddr == 0)
+ goto out;
+
+ err = 0;
+ if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
+ goto out;
+
+ if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
+ t->err_count++;
+ else
+ t->err_count = 1;
+ t->err_time = jiffies;
+out:
+ rcu_read_unlock();
+ return err;
+}
+
+static inline void vti_ecn_decapsulate(const struct iphdr *outer_iph,
+ struct sk_buff *skb)
+{
+ struct iphdr *inner_iph = ip_hdr(skb);
+
+ if (INET_ECN_is_ce(outer_iph->tos))
+ IP_ECN_set_ce(inner_iph);
+}
+
+/*
+ * We dont digest the packet therefore let the packet pass.
+ */
+static int vti_rcv(struct sk_buff *skb)
+{
+ struct ip_tunnel *tunnel;
+ const struct iphdr *iph = ip_hdr(skb);
+
+ rcu_read_lock();
+ tunnel = vti_tunnel_lookup(dev_net(skb->dev), iph->saddr, iph->daddr);
+ if (tunnel != NULL) {
+ struct pcpu_tstats *tstats;
+
+ tstats = this_cpu_ptr(tunnel->dev->tstats);
+ tstats->rx_packets++;
+ tstats->rx_bytes += skb->len;
+
+ skb->dev = tunnel->dev;
+ skb_dst_drop(skb);
+ nf_reset(skb);
+ rcu_read_unlock();
+ /* We do not eat the packet here therefore return 1 */
+ return 1;
+ }
+ rcu_read_unlock();
+
+ return -1;
+}
+
+/*
+ * This function assumes it is being called from dev_queue_xmit()
+ * and that skb is filled properly by that function.
+ */
+
+static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ struct pcpu_tstats *tstats;
+ struct net_device_stats *stats = &tunnel->dev->stats;
+ struct iphdr *tiph = &tunnel->parms.iph;
+ u8 tos = tunnel->parms.iph.tos;
+ struct rtable *rt; /* Route to the other host */
+ struct net_device *tdev; /* Device to other host */
+ struct iphdr *old_iph = ip_hdr(skb);
+ __be32 dst = tiph->daddr;
+ struct flowi4 fl4;
+
+ if (skb->protocol != htons(ETH_P_IP))
+ goto tx_error;
+
+ if (tos&1)
+ tos = old_iph->tos;
+
+ if (!dst) {
+ /* NBMA tunnel */
+ rt = skb_rtable(skb);
+ if (rt == NULL) {
+ stats->tx_fifo_errors++;
+ goto tx_error;
+ }
+ dst = rt->rt_gateway;
+ if (dst == 0)
+ goto tx_error_icmp;
+ }
+
+ memset(&fl4, 0, sizeof(fl4));
+ flowi4_init_output(&fl4, tunnel->parms.link,
+ htonl(tunnel->parms.i_key), RT_TOS(tos), RT_SCOPE_UNIVERSE,
+ IPPROTO_IPIP, 0,
+ dst, tiph->saddr, 0, 0);
+ rt = ip_route_output_key(dev_net(dev), &fl4);
+ if (IS_ERR(rt)) {
+ dev->stats.tx_carrier_errors++;
+ goto tx_error_icmp;
+ }
+#ifdef CONFIG_XFRM
+ /* if there is no transform then this tunnel is not functional. */
+ if (!rt->dst.xfrm) {
+ stats->tx_carrier_errors++;
+ goto tx_error_icmp;
+ }
+#endif
+ tdev = rt->dst.dev;
+
+ if (tdev == dev) {
+ ip_rt_put(rt);
+ stats->collisions++;
+ 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;
+ }
+
+
+ IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
+ IPSKB_REROUTED);
+ skb_dst_drop(skb);
+ skb_dst_set(skb, &rt->dst);
+ nf_reset(skb);
+ skb->dev = skb_dst(skb)->dev;
+
+ tstats = this_cpu_ptr(dev->tstats);
+ VTI_XMIT(tstats, &dev->stats);
+ return NETDEV_TX_OK;
+
+tx_error_icmp:
+ dst_link_failure(skb);
+tx_error:
+ stats->tx_errors++;
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+static int vti_tunnel_bind_dev(struct net_device *dev)
+{
+ struct net_device *tdev = NULL;
+ struct ip_tunnel *tunnel;
+ struct iphdr *iph;
+
+ tunnel = netdev_priv(dev);
+ iph = &tunnel->parms.iph;
+
+ if (iph->daddr) {
+ struct rtable *rt;
+ struct flowi4 fl4;
+ memset(&fl4, 0, sizeof(fl4));
+ flowi4_init_output(&fl4, tunnel->parms.link,
+ htonl(tunnel->parms.i_key), RT_TOS(iph->tos), RT_SCOPE_UNIVERSE,
+ IPPROTO_IPIP, 0,
+ iph->daddr, iph->saddr, 0, 0);
+ rt = ip_route_output_key(dev_net(dev), &fl4);
+ if (!IS_ERR(rt)) {
+ tdev = rt->dst.dev;
+ ip_rt_put(rt);
+ }
+ dev->flags |= IFF_POINTOPOINT;
+ }
+
+ if (!tdev && tunnel->parms.link)
+ tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
+
+ if (tdev) {
+ dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
+ dev->mtu = tdev->mtu;
+ }
+ dev->iflink = tunnel->parms.link;
+ return dev->mtu;
+}
+
+static int
+vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+ int err = 0;
+ struct ip_tunnel_parm p;
+ struct ip_tunnel *t;
+ struct net *net = dev_net(dev);
+ struct vti_net *ipn = net_generic(net, vti_net_id);
+
+ switch (cmd) {
+ case SIOCGETTUNNEL:
+ t = NULL;
+ if (dev == ipn->fb_tunnel_dev) {
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
+ err = -EFAULT;
+ break;
+ }
+ t = vti_tunnel_locate(net, &p, 0);
+ }
+ if (t == NULL)
+ t = netdev_priv(dev);
+ memcpy(&p, &t->parms, sizeof(p));
+ p.i_flags |= GRE_KEY;
+ 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_ESP ||
+ 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 = 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_ESP;
+ 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.iph.ttl = p.iph.ttl;
+ t->parms.iph.tos = p.iph.tos;
+ t->parms.iph.frag_off = p.iph.frag_off;
+ 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);
+ }
+ }
+ 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_ESP;
+ 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_ESP;
+
+ 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;
+ return 0;
+}
+
+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 ESP tunneling driver v4\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");
--
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