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-rw-r--r--net/ipv4/ip_vti.c726
1 files changed, 726 insertions, 0 deletions
diff --git a/net/ipv4/ip_vti.c b/net/ipv4/ip_vti.c
new file mode 100644
index 000000000..615c1dcf3
--- /dev/null
+++ b/net/ipv4/ip_vti.c
@@ -0,0 +1,726 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Linux NET3: IP/IP protocol decoder modified to support
+ * virtual tunnel interface
+ *
+ * Authors:
+ * Saurabh Mohan (saurabh.mohan@vyatta.com) 05/07/2012
+ */
+
+/*
+ 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/init.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/if_ether.h>
+#include <linux/icmpv6.h>
+
+#include <net/sock.h>
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/ip_tunnels.h>
+#include <net/inet_ecn.h>
+#include <net/xfrm.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+
+static struct rtnl_link_ops vti_link_ops __read_mostly;
+
+static unsigned int vti_net_id __read_mostly;
+static int vti_tunnel_init(struct net_device *dev);
+
+static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi,
+ int encap_type, bool update_skb_dev)
+{
+ struct ip_tunnel *tunnel;
+ const struct iphdr *iph = ip_hdr(skb);
+ struct net *net = dev_net(skb->dev);
+ struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
+
+ tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
+ iph->saddr, iph->daddr, 0);
+ if (tunnel) {
+ if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
+ goto drop;
+
+ XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel;
+
+ if (update_skb_dev)
+ skb->dev = tunnel->dev;
+
+ return xfrm_input(skb, nexthdr, spi, encap_type);
+ }
+
+ return -EINVAL;
+drop:
+ kfree_skb(skb);
+ return 0;
+}
+
+static int vti_input_proto(struct sk_buff *skb, int nexthdr, __be32 spi,
+ int encap_type)
+{
+ return vti_input(skb, nexthdr, spi, encap_type, false);
+}
+
+static int vti_rcv(struct sk_buff *skb, __be32 spi, bool update_skb_dev)
+{
+ XFRM_SPI_SKB_CB(skb)->family = AF_INET;
+ XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
+
+ return vti_input(skb, ip_hdr(skb)->protocol, spi, 0, update_skb_dev);
+}
+
+static int vti_rcv_proto(struct sk_buff *skb)
+{
+ return vti_rcv(skb, 0, false);
+}
+
+static int vti_rcv_cb(struct sk_buff *skb, int err)
+{
+ unsigned short family;
+ struct net_device *dev;
+ struct xfrm_state *x;
+ const struct xfrm_mode *inner_mode;
+ struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
+ u32 orig_mark = skb->mark;
+ int ret;
+
+ if (!tunnel)
+ return 1;
+
+ dev = tunnel->dev;
+
+ if (err) {
+ dev->stats.rx_errors++;
+ dev->stats.rx_dropped++;
+
+ return 0;
+ }
+
+ x = xfrm_input_state(skb);
+
+ inner_mode = &x->inner_mode;
+
+ if (x->sel.family == AF_UNSPEC) {
+ inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
+ if (inner_mode == NULL) {
+ XFRM_INC_STATS(dev_net(skb->dev),
+ LINUX_MIB_XFRMINSTATEMODEERROR);
+ return -EINVAL;
+ }
+ }
+
+ family = inner_mode->family;
+
+ skb->mark = be32_to_cpu(tunnel->parms.i_key);
+ ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
+ skb->mark = orig_mark;
+
+ if (!ret)
+ return -EPERM;
+
+ skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev)));
+ skb->dev = dev;
+ dev_sw_netstats_rx_add(dev, skb->len);
+
+ return 0;
+}
+
+static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src)
+{
+ xfrm_address_t *daddr = (xfrm_address_t *)&dst;
+ xfrm_address_t *saddr = (xfrm_address_t *)&src;
+
+ /* if there is no transform then this tunnel is not functional.
+ * Or if the xfrm is not mode tunnel.
+ */
+ if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
+ x->props.family != AF_INET)
+ return false;
+
+ if (!dst)
+ return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET);
+
+ if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET))
+ return false;
+
+ return true;
+}
+
+static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
+ struct flowi *fl)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ struct ip_tunnel_parm *parms = &tunnel->parms;
+ struct dst_entry *dst = skb_dst(skb);
+ struct net_device *tdev; /* Device to other host */
+ int pkt_len = skb->len;
+ int err;
+ int mtu;
+
+ if (!dst) {
+ switch (skb->protocol) {
+ case htons(ETH_P_IP): {
+ struct rtable *rt;
+
+ fl->u.ip4.flowi4_oif = dev->ifindex;
+ fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
+ rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4);
+ if (IS_ERR(rt)) {
+ dev->stats.tx_carrier_errors++;
+ goto tx_error_icmp;
+ }
+ dst = &rt->dst;
+ skb_dst_set(skb, dst);
+ break;
+ }
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ fl->u.ip6.flowi6_oif = dev->ifindex;
+ fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
+ dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6);
+ if (dst->error) {
+ dst_release(dst);
+ dst = NULL;
+ dev->stats.tx_carrier_errors++;
+ goto tx_error_icmp;
+ }
+ skb_dst_set(skb, dst);
+ break;
+#endif
+ default:
+ dev->stats.tx_carrier_errors++;
+ goto tx_error_icmp;
+ }
+ }
+
+ dst_hold(dst);
+ dst = xfrm_lookup_route(tunnel->net, dst, fl, NULL, 0);
+ if (IS_ERR(dst)) {
+ dev->stats.tx_carrier_errors++;
+ goto tx_error_icmp;
+ }
+
+ if (dst->flags & DST_XFRM_QUEUE)
+ goto xmit;
+
+ if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
+ dev->stats.tx_carrier_errors++;
+ dst_release(dst);
+ goto tx_error_icmp;
+ }
+
+ tdev = dst->dev;
+
+ if (tdev == dev) {
+ dst_release(dst);
+ dev->stats.collisions++;
+ goto tx_error;
+ }
+
+ mtu = dst_mtu(dst);
+ if (skb->len > mtu) {
+ skb_dst_update_pmtu_no_confirm(skb, mtu);
+ if (skb->protocol == htons(ETH_P_IP)) {
+ if (!(ip_hdr(skb)->frag_off & htons(IP_DF)))
+ goto xmit;
+ icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
+ htonl(mtu));
+ } else {
+ if (mtu < IPV6_MIN_MTU)
+ mtu = IPV6_MIN_MTU;
+
+ icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+ }
+
+ dst_release(dst);
+ goto tx_error;
+ }
+
+xmit:
+ skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
+ skb_dst_set(skb, dst);
+ skb->dev = skb_dst(skb)->dev;
+
+ err = dst_output(tunnel->net, skb->sk, skb);
+ if (net_xmit_eval(err) == 0)
+ err = pkt_len;
+ iptunnel_xmit_stats(dev, err);
+ return NETDEV_TX_OK;
+
+tx_error_icmp:
+ dst_link_failure(skb);
+tx_error:
+ dev->stats.tx_errors++;
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+/* 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 flowi fl;
+
+ if (!pskb_inet_may_pull(skb))
+ goto tx_err;
+
+ memset(&fl, 0, sizeof(fl));
+
+ switch (skb->protocol) {
+ case htons(ETH_P_IP):
+ memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
+ xfrm_decode_session(skb, &fl, AF_INET);
+ break;
+ case htons(ETH_P_IPV6):
+ memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
+ xfrm_decode_session(skb, &fl, AF_INET6);
+ break;
+ default:
+ goto tx_err;
+ }
+
+ /* override mark with tunnel output key */
+ fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key);
+
+ return vti_xmit(skb, dev, &fl);
+
+tx_err:
+ dev->stats.tx_errors++;
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+static int vti4_err(struct sk_buff *skb, u32 info)
+{
+ __be32 spi;
+ __u32 mark;
+ struct xfrm_state *x;
+ struct ip_tunnel *tunnel;
+ struct ip_esp_hdr *esph;
+ struct ip_auth_hdr *ah ;
+ struct ip_comp_hdr *ipch;
+ struct net *net = dev_net(skb->dev);
+ const struct iphdr *iph = (const struct iphdr *)skb->data;
+ int protocol = iph->protocol;
+ struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
+
+ tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
+ iph->daddr, iph->saddr, 0);
+ if (!tunnel)
+ return -1;
+
+ mark = be32_to_cpu(tunnel->parms.o_key);
+
+ switch (protocol) {
+ case IPPROTO_ESP:
+ esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
+ spi = esph->spi;
+ break;
+ case IPPROTO_AH:
+ ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
+ spi = ah->spi;
+ break;
+ case IPPROTO_COMP:
+ ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
+ spi = htonl(ntohs(ipch->cpi));
+ break;
+ default:
+ return 0;
+ }
+
+ switch (icmp_hdr(skb)->type) {
+ case ICMP_DEST_UNREACH:
+ if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
+ return 0;
+ break;
+ case ICMP_REDIRECT:
+ break;
+ default:
+ return 0;
+ }
+
+ x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
+ spi, protocol, AF_INET);
+ if (!x)
+ return 0;
+
+ if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
+ ipv4_update_pmtu(skb, net, info, 0, protocol);
+ else
+ ipv4_redirect(skb, net, 0, protocol);
+ xfrm_state_put(x);
+
+ return 0;
+}
+
+static int
+vti_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
+{
+ int err = 0;
+
+ if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
+ if (p->iph.version != 4 || p->iph.protocol != IPPROTO_IPIP ||
+ p->iph.ihl != 5)
+ return -EINVAL;
+ }
+
+ if (!(p->i_flags & GRE_KEY))
+ p->i_key = 0;
+ if (!(p->o_flags & GRE_KEY))
+ p->o_key = 0;
+
+ p->i_flags = VTI_ISVTI;
+
+ err = ip_tunnel_ctl(dev, p, cmd);
+ if (err)
+ return err;
+
+ if (cmd != SIOCDELTUNNEL) {
+ p->i_flags |= GRE_KEY;
+ p->o_flags |= GRE_KEY;
+ }
+ return 0;
+}
+
+static const struct net_device_ops vti_netdev_ops = {
+ .ndo_init = vti_tunnel_init,
+ .ndo_uninit = ip_tunnel_uninit,
+ .ndo_start_xmit = vti_tunnel_xmit,
+ .ndo_siocdevprivate = ip_tunnel_siocdevprivate,
+ .ndo_change_mtu = ip_tunnel_change_mtu,
+ .ndo_get_stats64 = dev_get_tstats64,
+ .ndo_get_iflink = ip_tunnel_get_iflink,
+ .ndo_tunnel_ctl = vti_tunnel_ctl,
+};
+
+static void vti_tunnel_setup(struct net_device *dev)
+{
+ dev->netdev_ops = &vti_netdev_ops;
+ dev->header_ops = &ip_tunnel_header_ops;
+ dev->type = ARPHRD_TUNNEL;
+ ip_tunnel_setup(dev, vti_net_id);
+}
+
+static int vti_tunnel_init(struct net_device *dev)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ struct iphdr *iph = &tunnel->parms.iph;
+
+ __dev_addr_set(dev, &iph->saddr, 4);
+ memcpy(dev->broadcast, &iph->daddr, 4);
+
+ dev->flags = IFF_NOARP;
+ dev->addr_len = 4;
+ dev->features |= NETIF_F_LLTX;
+ netif_keep_dst(dev);
+
+ return ip_tunnel_init(dev);
+}
+
+static void __net_init vti_fb_tunnel_init(struct net_device *dev)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ struct iphdr *iph = &tunnel->parms.iph;
+
+ iph->version = 4;
+ iph->protocol = IPPROTO_IPIP;
+ iph->ihl = 5;
+}
+
+static struct xfrm4_protocol vti_esp4_protocol __read_mostly = {
+ .handler = vti_rcv_proto,
+ .input_handler = vti_input_proto,
+ .cb_handler = vti_rcv_cb,
+ .err_handler = vti4_err,
+ .priority = 100,
+};
+
+static struct xfrm4_protocol vti_ah4_protocol __read_mostly = {
+ .handler = vti_rcv_proto,
+ .input_handler = vti_input_proto,
+ .cb_handler = vti_rcv_cb,
+ .err_handler = vti4_err,
+ .priority = 100,
+};
+
+static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = {
+ .handler = vti_rcv_proto,
+ .input_handler = vti_input_proto,
+ .cb_handler = vti_rcv_cb,
+ .err_handler = vti4_err,
+ .priority = 100,
+};
+
+#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
+static int vti_rcv_tunnel(struct sk_buff *skb)
+{
+ XFRM_SPI_SKB_CB(skb)->family = AF_INET;
+ XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
+
+ return vti_input(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr, 0, false);
+}
+
+static struct xfrm_tunnel vti_ipip_handler __read_mostly = {
+ .handler = vti_rcv_tunnel,
+ .cb_handler = vti_rcv_cb,
+ .err_handler = vti4_err,
+ .priority = 0,
+};
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct xfrm_tunnel vti_ipip6_handler __read_mostly = {
+ .handler = vti_rcv_tunnel,
+ .cb_handler = vti_rcv_cb,
+ .err_handler = vti4_err,
+ .priority = 0,
+};
+#endif
+#endif
+
+static int __net_init vti_init_net(struct net *net)
+{
+ int err;
+ struct ip_tunnel_net *itn;
+
+ err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
+ if (err)
+ return err;
+ itn = net_generic(net, vti_net_id);
+ if (itn->fb_tunnel_dev)
+ vti_fb_tunnel_init(itn->fb_tunnel_dev);
+ return 0;
+}
+
+static void __net_exit vti_exit_batch_net(struct list_head *list_net)
+{
+ ip_tunnel_delete_nets(list_net, vti_net_id, &vti_link_ops);
+}
+
+static struct pernet_operations vti_net_ops = {
+ .init = vti_init_net,
+ .exit_batch = vti_exit_batch_net,
+ .id = &vti_net_id,
+ .size = sizeof(struct ip_tunnel_net),
+};
+
+static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ return 0;
+}
+
+static void vti_netlink_parms(struct nlattr *data[],
+ struct ip_tunnel_parm *parms,
+ __u32 *fwmark)
+{
+ memset(parms, 0, sizeof(*parms));
+
+ parms->iph.protocol = IPPROTO_IPIP;
+
+ if (!data)
+ return;
+
+ parms->i_flags = VTI_ISVTI;
+
+ 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_in_addr(data[IFLA_VTI_LOCAL]);
+
+ if (data[IFLA_VTI_REMOTE])
+ parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]);
+
+ if (data[IFLA_VTI_FWMARK])
+ *fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
+}
+
+static int vti_newlink(struct net *src_net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct ip_tunnel_parm parms;
+ __u32 fwmark = 0;
+
+ vti_netlink_parms(data, &parms, &fwmark);
+ return ip_tunnel_newlink(dev, tb, &parms, fwmark);
+}
+
+static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
+ struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct ip_tunnel *t = netdev_priv(dev);
+ __u32 fwmark = t->fwmark;
+ struct ip_tunnel_parm p;
+
+ vti_netlink_parms(data, &p, &fwmark);
+ return ip_tunnel_changelink(dev, tb, &p, fwmark);
+}
+
+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) +
+ /* IFLA_VTI_FWMARK */
+ 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;
+
+ if (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_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) ||
+ nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) ||
+ nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark))
+ return -EMSGSIZE;
+
+ 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 = sizeof_field(struct iphdr, saddr) },
+ [IFLA_VTI_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) },
+ [IFLA_VTI_FWMARK] = { .type = NLA_U32 },
+};
+
+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,
+ .dellink = ip_tunnel_dellink,
+ .get_size = vti_get_size,
+ .fill_info = vti_fill_info,
+ .get_link_net = ip_tunnel_get_link_net,
+};
+
+static int __init vti_init(void)
+{
+ const char *msg;
+ int err;
+
+ pr_info("IPv4 over IPsec tunneling driver\n");
+
+ msg = "tunnel device";
+ err = register_pernet_device(&vti_net_ops);
+ if (err < 0)
+ goto pernet_dev_failed;
+
+ msg = "tunnel protocols";
+ err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
+ if (err < 0)
+ goto xfrm_proto_esp_failed;
+ err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
+ if (err < 0)
+ goto xfrm_proto_ah_failed;
+ err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
+ if (err < 0)
+ goto xfrm_proto_comp_failed;
+
+#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
+ msg = "ipip tunnel";
+ err = xfrm4_tunnel_register(&vti_ipip_handler, AF_INET);
+ if (err < 0)
+ goto xfrm_tunnel_ipip_failed;
+#if IS_ENABLED(CONFIG_IPV6)
+ err = xfrm4_tunnel_register(&vti_ipip6_handler, AF_INET6);
+ if (err < 0)
+ goto xfrm_tunnel_ipip6_failed;
+#endif
+#endif
+
+ msg = "netlink interface";
+ err = rtnl_link_register(&vti_link_ops);
+ if (err < 0)
+ goto rtnl_link_failed;
+
+ return err;
+
+rtnl_link_failed:
+#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
+#if IS_ENABLED(CONFIG_IPV6)
+ xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6);
+xfrm_tunnel_ipip6_failed:
+#endif
+ xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET);
+xfrm_tunnel_ipip_failed:
+#endif
+ xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
+xfrm_proto_comp_failed:
+ xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
+xfrm_proto_ah_failed:
+ xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
+xfrm_proto_esp_failed:
+ unregister_pernet_device(&vti_net_ops);
+pernet_dev_failed:
+ pr_err("vti init: failed to register %s\n", msg);
+ return err;
+}
+
+static void __exit vti_fini(void)
+{
+ rtnl_link_unregister(&vti_link_ops);
+#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
+#if IS_ENABLED(CONFIG_IPV6)
+ xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6);
+#endif
+ xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET);
+#endif
+ xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
+ xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
+ xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
+ 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");