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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *  IPv6 virtual tunneling interface
0004  *
0005  *  Copyright (C) 2013 secunet Security Networks AG
0006  *
0007  *  Author:
0008  *  Steffen Klassert <steffen.klassert@secunet.com>
0009  *
0010  *  Based on:
0011  *  net/ipv6/ip6_tunnel.c
0012  */
0013 
0014 #include <linux/module.h>
0015 #include <linux/capability.h>
0016 #include <linux/errno.h>
0017 #include <linux/types.h>
0018 #include <linux/sockios.h>
0019 #include <linux/icmp.h>
0020 #include <linux/if.h>
0021 #include <linux/in.h>
0022 #include <linux/ip.h>
0023 #include <linux/net.h>
0024 #include <linux/in6.h>
0025 #include <linux/netdevice.h>
0026 #include <linux/if_arp.h>
0027 #include <linux/icmpv6.h>
0028 #include <linux/init.h>
0029 #include <linux/route.h>
0030 #include <linux/rtnetlink.h>
0031 #include <linux/netfilter_ipv6.h>
0032 #include <linux/slab.h>
0033 #include <linux/hash.h>
0034 
0035 #include <linux/uaccess.h>
0036 #include <linux/atomic.h>
0037 
0038 #include <net/icmp.h>
0039 #include <net/ip.h>
0040 #include <net/ip_tunnels.h>
0041 #include <net/ipv6.h>
0042 #include <net/ip6_route.h>
0043 #include <net/addrconf.h>
0044 #include <net/ip6_tunnel.h>
0045 #include <net/xfrm.h>
0046 #include <net/net_namespace.h>
0047 #include <net/netns/generic.h>
0048 #include <linux/etherdevice.h>
0049 
0050 #define IP6_VTI_HASH_SIZE_SHIFT  5
0051 #define IP6_VTI_HASH_SIZE (1 << IP6_VTI_HASH_SIZE_SHIFT)
0052 
0053 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
0054 {
0055     u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
0056 
0057     return hash_32(hash, IP6_VTI_HASH_SIZE_SHIFT);
0058 }
0059 
0060 static int vti6_dev_init(struct net_device *dev);
0061 static void vti6_dev_setup(struct net_device *dev);
0062 static struct rtnl_link_ops vti6_link_ops __read_mostly;
0063 
0064 static unsigned int vti6_net_id __read_mostly;
0065 struct vti6_net {
0066     /* the vti6 tunnel fallback device */
0067     struct net_device *fb_tnl_dev;
0068     /* lists for storing tunnels in use */
0069     struct ip6_tnl __rcu *tnls_r_l[IP6_VTI_HASH_SIZE];
0070     struct ip6_tnl __rcu *tnls_wc[1];
0071     struct ip6_tnl __rcu **tnls[2];
0072 };
0073 
0074 #define for_each_vti6_tunnel_rcu(start) \
0075     for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
0076 
0077 /**
0078  * vti6_tnl_lookup - fetch tunnel matching the end-point addresses
0079  *   @net: network namespace
0080  *   @remote: the address of the tunnel exit-point
0081  *   @local: the address of the tunnel entry-point
0082  *
0083  * Return:
0084  *   tunnel matching given end-points if found,
0085  *   else fallback tunnel if its device is up,
0086  *   else %NULL
0087  **/
0088 static struct ip6_tnl *
0089 vti6_tnl_lookup(struct net *net, const struct in6_addr *remote,
0090         const struct in6_addr *local)
0091 {
0092     unsigned int hash = HASH(remote, local);
0093     struct ip6_tnl *t;
0094     struct vti6_net *ip6n = net_generic(net, vti6_net_id);
0095     struct in6_addr any;
0096 
0097     for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
0098         if (ipv6_addr_equal(local, &t->parms.laddr) &&
0099             ipv6_addr_equal(remote, &t->parms.raddr) &&
0100             (t->dev->flags & IFF_UP))
0101             return t;
0102     }
0103 
0104     memset(&any, 0, sizeof(any));
0105     hash = HASH(&any, local);
0106     for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
0107         if (ipv6_addr_equal(local, &t->parms.laddr) &&
0108             (t->dev->flags & IFF_UP))
0109             return t;
0110     }
0111 
0112     hash = HASH(remote, &any);
0113     for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
0114         if (ipv6_addr_equal(remote, &t->parms.raddr) &&
0115             (t->dev->flags & IFF_UP))
0116             return t;
0117     }
0118 
0119     t = rcu_dereference(ip6n->tnls_wc[0]);
0120     if (t && (t->dev->flags & IFF_UP))
0121         return t;
0122 
0123     return NULL;
0124 }
0125 
0126 /**
0127  * vti6_tnl_bucket - get head of list matching given tunnel parameters
0128  *   @ip6n: the private data for ip6_vti in the netns
0129  *   @p: parameters containing tunnel end-points
0130  *
0131  * Description:
0132  *   vti6_tnl_bucket() returns the head of the list matching the
0133  *   &struct in6_addr entries laddr and raddr in @p.
0134  *
0135  * Return: head of IPv6 tunnel list
0136  **/
0137 static struct ip6_tnl __rcu **
0138 vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
0139 {
0140     const struct in6_addr *remote = &p->raddr;
0141     const struct in6_addr *local = &p->laddr;
0142     unsigned int h = 0;
0143     int prio = 0;
0144 
0145     if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
0146         prio = 1;
0147         h = HASH(remote, local);
0148     }
0149     return &ip6n->tnls[prio][h];
0150 }
0151 
0152 static void
0153 vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
0154 {
0155     struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
0156 
0157     rcu_assign_pointer(t->next , rtnl_dereference(*tp));
0158     rcu_assign_pointer(*tp, t);
0159 }
0160 
0161 static void
0162 vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
0163 {
0164     struct ip6_tnl __rcu **tp;
0165     struct ip6_tnl *iter;
0166 
0167     for (tp = vti6_tnl_bucket(ip6n, &t->parms);
0168          (iter = rtnl_dereference(*tp)) != NULL;
0169          tp = &iter->next) {
0170         if (t == iter) {
0171             rcu_assign_pointer(*tp, t->next);
0172             break;
0173         }
0174     }
0175 }
0176 
0177 static void vti6_dev_free(struct net_device *dev)
0178 {
0179     free_percpu(dev->tstats);
0180 }
0181 
0182 static int vti6_tnl_create2(struct net_device *dev)
0183 {
0184     struct ip6_tnl *t = netdev_priv(dev);
0185     struct net *net = dev_net(dev);
0186     struct vti6_net *ip6n = net_generic(net, vti6_net_id);
0187     int err;
0188 
0189     dev->rtnl_link_ops = &vti6_link_ops;
0190     err = register_netdevice(dev);
0191     if (err < 0)
0192         goto out;
0193 
0194     strcpy(t->parms.name, dev->name);
0195 
0196     vti6_tnl_link(ip6n, t);
0197 
0198     return 0;
0199 
0200 out:
0201     return err;
0202 }
0203 
0204 static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
0205 {
0206     struct net_device *dev;
0207     struct ip6_tnl *t;
0208     char name[IFNAMSIZ];
0209     int err;
0210 
0211     if (p->name[0]) {
0212         if (!dev_valid_name(p->name))
0213             goto failed;
0214         strlcpy(name, p->name, IFNAMSIZ);
0215     } else {
0216         sprintf(name, "ip6_vti%%d");
0217     }
0218 
0219     dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
0220     if (!dev)
0221         goto failed;
0222 
0223     dev_net_set(dev, net);
0224 
0225     t = netdev_priv(dev);
0226     t->parms = *p;
0227     t->net = dev_net(dev);
0228 
0229     err = vti6_tnl_create2(dev);
0230     if (err < 0)
0231         goto failed_free;
0232 
0233     return t;
0234 
0235 failed_free:
0236     free_netdev(dev);
0237 failed:
0238     return NULL;
0239 }
0240 
0241 /**
0242  * vti6_locate - find or create tunnel matching given parameters
0243  *   @net: network namespace
0244  *   @p: tunnel parameters
0245  *   @create: != 0 if allowed to create new tunnel if no match found
0246  *
0247  * Description:
0248  *   vti6_locate() first tries to locate an existing tunnel
0249  *   based on @parms. If this is unsuccessful, but @create is set a new
0250  *   tunnel device is created and registered for use.
0251  *
0252  * Return:
0253  *   matching tunnel or NULL
0254  **/
0255 static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
0256                    int create)
0257 {
0258     const struct in6_addr *remote = &p->raddr;
0259     const struct in6_addr *local = &p->laddr;
0260     struct ip6_tnl __rcu **tp;
0261     struct ip6_tnl *t;
0262     struct vti6_net *ip6n = net_generic(net, vti6_net_id);
0263 
0264     for (tp = vti6_tnl_bucket(ip6n, p);
0265          (t = rtnl_dereference(*tp)) != NULL;
0266          tp = &t->next) {
0267         if (ipv6_addr_equal(local, &t->parms.laddr) &&
0268             ipv6_addr_equal(remote, &t->parms.raddr)) {
0269             if (create)
0270                 return NULL;
0271 
0272             return t;
0273         }
0274     }
0275     if (!create)
0276         return NULL;
0277     return vti6_tnl_create(net, p);
0278 }
0279 
0280 /**
0281  * vti6_dev_uninit - tunnel device uninitializer
0282  *   @dev: the device to be destroyed
0283  *
0284  * Description:
0285  *   vti6_dev_uninit() removes tunnel from its list
0286  **/
0287 static void vti6_dev_uninit(struct net_device *dev)
0288 {
0289     struct ip6_tnl *t = netdev_priv(dev);
0290     struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
0291 
0292     if (dev == ip6n->fb_tnl_dev)
0293         RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
0294     else
0295         vti6_tnl_unlink(ip6n, t);
0296     netdev_put(dev, &t->dev_tracker);
0297 }
0298 
0299 static int vti6_input_proto(struct sk_buff *skb, int nexthdr, __be32 spi,
0300                 int encap_type)
0301 {
0302     struct ip6_tnl *t;
0303     const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
0304 
0305     rcu_read_lock();
0306     t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
0307     if (t) {
0308         if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
0309             rcu_read_unlock();
0310             goto discard;
0311         }
0312 
0313         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
0314             rcu_read_unlock();
0315             goto discard;
0316         }
0317 
0318         ipv6h = ipv6_hdr(skb);
0319         if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
0320             t->dev->stats.rx_dropped++;
0321             rcu_read_unlock();
0322             goto discard;
0323         }
0324 
0325         rcu_read_unlock();
0326 
0327         XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
0328         XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
0329         XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
0330         return xfrm_input(skb, nexthdr, spi, encap_type);
0331     }
0332     rcu_read_unlock();
0333     return -EINVAL;
0334 discard:
0335     kfree_skb(skb);
0336     return 0;
0337 }
0338 
0339 static int vti6_rcv(struct sk_buff *skb)
0340 {
0341     int nexthdr = skb_network_header(skb)[IP6CB(skb)->nhoff];
0342 
0343     return vti6_input_proto(skb, nexthdr, 0, 0);
0344 }
0345 
0346 static int vti6_rcv_cb(struct sk_buff *skb, int err)
0347 {
0348     unsigned short family;
0349     struct net_device *dev;
0350     struct xfrm_state *x;
0351     const struct xfrm_mode *inner_mode;
0352     struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
0353     u32 orig_mark = skb->mark;
0354     int ret;
0355 
0356     if (!t)
0357         return 1;
0358 
0359     dev = t->dev;
0360 
0361     if (err) {
0362         dev->stats.rx_errors++;
0363         dev->stats.rx_dropped++;
0364 
0365         return 0;
0366     }
0367 
0368     x = xfrm_input_state(skb);
0369 
0370     inner_mode = &x->inner_mode;
0371 
0372     if (x->sel.family == AF_UNSPEC) {
0373         inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
0374         if (inner_mode == NULL) {
0375             XFRM_INC_STATS(dev_net(skb->dev),
0376                        LINUX_MIB_XFRMINSTATEMODEERROR);
0377             return -EINVAL;
0378         }
0379     }
0380 
0381     family = inner_mode->family;
0382 
0383     skb->mark = be32_to_cpu(t->parms.i_key);
0384     ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
0385     skb->mark = orig_mark;
0386 
0387     if (!ret)
0388         return -EPERM;
0389 
0390     skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
0391     skb->dev = dev;
0392     dev_sw_netstats_rx_add(dev, skb->len);
0393 
0394     return 0;
0395 }
0396 
0397 /**
0398  * vti6_addr_conflict - compare packet addresses to tunnel's own
0399  *   @t: the outgoing tunnel device
0400  *   @hdr: IPv6 header from the incoming packet
0401  *
0402  * Description:
0403  *   Avoid trivial tunneling loop by checking that tunnel exit-point
0404  *   doesn't match source of incoming packet.
0405  *
0406  * Return:
0407  *   1 if conflict,
0408  *   0 else
0409  **/
0410 static inline bool
0411 vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
0412 {
0413     return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
0414 }
0415 
0416 static bool vti6_state_check(const struct xfrm_state *x,
0417                  const struct in6_addr *dst,
0418                  const struct in6_addr *src)
0419 {
0420     xfrm_address_t *daddr = (xfrm_address_t *)dst;
0421     xfrm_address_t *saddr = (xfrm_address_t *)src;
0422 
0423     /* if there is no transform then this tunnel is not functional.
0424      * Or if the xfrm is not mode tunnel.
0425      */
0426     if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
0427         x->props.family != AF_INET6)
0428         return false;
0429 
0430     if (ipv6_addr_any(dst))
0431         return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
0432 
0433     if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
0434         return false;
0435 
0436     return true;
0437 }
0438 
0439 /**
0440  * vti6_xmit - send a packet
0441  *   @skb: the outgoing socket buffer
0442  *   @dev: the outgoing tunnel device
0443  *   @fl: the flow informations for the xfrm_lookup
0444  **/
0445 static int
0446 vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
0447 {
0448     struct ip6_tnl *t = netdev_priv(dev);
0449     struct net_device_stats *stats = &t->dev->stats;
0450     struct dst_entry *dst = skb_dst(skb);
0451     struct net_device *tdev;
0452     struct xfrm_state *x;
0453     int pkt_len = skb->len;
0454     int err = -1;
0455     int mtu;
0456 
0457     if (!dst) {
0458         switch (skb->protocol) {
0459         case htons(ETH_P_IP): {
0460             struct rtable *rt;
0461 
0462             fl->u.ip4.flowi4_oif = dev->ifindex;
0463             fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
0464             rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4);
0465             if (IS_ERR(rt))
0466                 goto tx_err_link_failure;
0467             dst = &rt->dst;
0468             skb_dst_set(skb, dst);
0469             break;
0470         }
0471         case htons(ETH_P_IPV6):
0472             fl->u.ip6.flowi6_oif = dev->ifindex;
0473             fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
0474             dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6);
0475             if (dst->error) {
0476                 dst_release(dst);
0477                 dst = NULL;
0478                 goto tx_err_link_failure;
0479             }
0480             skb_dst_set(skb, dst);
0481             break;
0482         default:
0483             goto tx_err_link_failure;
0484         }
0485     }
0486 
0487     dst_hold(dst);
0488     dst = xfrm_lookup_route(t->net, dst, fl, NULL, 0);
0489     if (IS_ERR(dst)) {
0490         err = PTR_ERR(dst);
0491         dst = NULL;
0492         goto tx_err_link_failure;
0493     }
0494 
0495     if (dst->flags & DST_XFRM_QUEUE)
0496         goto xmit;
0497 
0498     x = dst->xfrm;
0499     if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr))
0500         goto tx_err_link_failure;
0501 
0502     if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr,
0503                   (const struct in6_addr *)&x->id.daddr))
0504         goto tx_err_link_failure;
0505 
0506     tdev = dst->dev;
0507 
0508     if (tdev == dev) {
0509         stats->collisions++;
0510         net_warn_ratelimited("%s: Local routing loop detected!\n",
0511                      t->parms.name);
0512         goto tx_err_dst_release;
0513     }
0514 
0515     mtu = dst_mtu(dst);
0516     if (skb->len > mtu) {
0517         skb_dst_update_pmtu_no_confirm(skb, mtu);
0518 
0519         if (skb->protocol == htons(ETH_P_IPV6)) {
0520             if (mtu < IPV6_MIN_MTU)
0521                 mtu = IPV6_MIN_MTU;
0522 
0523             icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
0524         } else {
0525             if (!(ip_hdr(skb)->frag_off & htons(IP_DF)))
0526                 goto xmit;
0527             icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
0528                       htonl(mtu));
0529         }
0530 
0531         err = -EMSGSIZE;
0532         goto tx_err_dst_release;
0533     }
0534 
0535 xmit:
0536     skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
0537     skb_dst_set(skb, dst);
0538     skb->dev = skb_dst(skb)->dev;
0539 
0540     err = dst_output(t->net, skb->sk, skb);
0541     if (net_xmit_eval(err) == 0)
0542         err = pkt_len;
0543     iptunnel_xmit_stats(dev, err);
0544 
0545     return 0;
0546 tx_err_link_failure:
0547     stats->tx_carrier_errors++;
0548     dst_link_failure(skb);
0549 tx_err_dst_release:
0550     dst_release(dst);
0551     return err;
0552 }
0553 
0554 static netdev_tx_t
0555 vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
0556 {
0557     struct ip6_tnl *t = netdev_priv(dev);
0558     struct net_device_stats *stats = &t->dev->stats;
0559     struct flowi fl;
0560     int ret;
0561 
0562     if (!pskb_inet_may_pull(skb))
0563         goto tx_err;
0564 
0565     memset(&fl, 0, sizeof(fl));
0566 
0567     switch (skb->protocol) {
0568     case htons(ETH_P_IPV6):
0569         if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
0570             vti6_addr_conflict(t, ipv6_hdr(skb)))
0571             goto tx_err;
0572 
0573         xfrm_decode_session(skb, &fl, AF_INET6);
0574         memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
0575         break;
0576     case htons(ETH_P_IP):
0577         xfrm_decode_session(skb, &fl, AF_INET);
0578         memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
0579         break;
0580     default:
0581         goto tx_err;
0582     }
0583 
0584     /* override mark with tunnel output key */
0585     fl.flowi_mark = be32_to_cpu(t->parms.o_key);
0586 
0587     ret = vti6_xmit(skb, dev, &fl);
0588     if (ret < 0)
0589         goto tx_err;
0590 
0591     return NETDEV_TX_OK;
0592 
0593 tx_err:
0594     stats->tx_errors++;
0595     stats->tx_dropped++;
0596     kfree_skb(skb);
0597     return NETDEV_TX_OK;
0598 }
0599 
0600 static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
0601             u8 type, u8 code, int offset, __be32 info)
0602 {
0603     __be32 spi;
0604     __u32 mark;
0605     struct xfrm_state *x;
0606     struct ip6_tnl *t;
0607     struct ip_esp_hdr *esph;
0608     struct ip_auth_hdr *ah;
0609     struct ip_comp_hdr *ipch;
0610     struct net *net = dev_net(skb->dev);
0611     const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
0612     int protocol = iph->nexthdr;
0613 
0614     t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
0615     if (!t)
0616         return -1;
0617 
0618     mark = be32_to_cpu(t->parms.o_key);
0619 
0620     switch (protocol) {
0621     case IPPROTO_ESP:
0622         esph = (struct ip_esp_hdr *)(skb->data + offset);
0623         spi = esph->spi;
0624         break;
0625     case IPPROTO_AH:
0626         ah = (struct ip_auth_hdr *)(skb->data + offset);
0627         spi = ah->spi;
0628         break;
0629     case IPPROTO_COMP:
0630         ipch = (struct ip_comp_hdr *)(skb->data + offset);
0631         spi = htonl(ntohs(ipch->cpi));
0632         break;
0633     default:
0634         return 0;
0635     }
0636 
0637     if (type != ICMPV6_PKT_TOOBIG &&
0638         type != NDISC_REDIRECT)
0639         return 0;
0640 
0641     x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
0642                   spi, protocol, AF_INET6);
0643     if (!x)
0644         return 0;
0645 
0646     if (type == NDISC_REDIRECT)
0647         ip6_redirect(skb, net, skb->dev->ifindex, 0,
0648                  sock_net_uid(net, NULL));
0649     else
0650         ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
0651     xfrm_state_put(x);
0652 
0653     return 0;
0654 }
0655 
0656 static void vti6_link_config(struct ip6_tnl *t, bool keep_mtu)
0657 {
0658     struct net_device *dev = t->dev;
0659     struct __ip6_tnl_parm *p = &t->parms;
0660     struct net_device *tdev = NULL;
0661     int mtu;
0662 
0663     __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
0664     memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
0665 
0666     p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
0667               IP6_TNL_F_CAP_PER_PACKET);
0668     p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
0669 
0670     if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
0671         dev->flags |= IFF_POINTOPOINT;
0672     else
0673         dev->flags &= ~IFF_POINTOPOINT;
0674 
0675     if (keep_mtu && dev->mtu) {
0676         dev->mtu = clamp(dev->mtu, dev->min_mtu, dev->max_mtu);
0677         return;
0678     }
0679 
0680     if (p->flags & IP6_TNL_F_CAP_XMIT) {
0681         int strict = (ipv6_addr_type(&p->raddr) &
0682                   (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
0683         struct rt6_info *rt = rt6_lookup(t->net,
0684                          &p->raddr, &p->laddr,
0685                          p->link, NULL, strict);
0686 
0687         if (rt)
0688             tdev = rt->dst.dev;
0689         ip6_rt_put(rt);
0690     }
0691 
0692     if (!tdev && p->link)
0693         tdev = __dev_get_by_index(t->net, p->link);
0694 
0695     if (tdev)
0696         mtu = tdev->mtu - sizeof(struct ipv6hdr);
0697     else
0698         mtu = ETH_DATA_LEN - LL_MAX_HEADER - sizeof(struct ipv6hdr);
0699 
0700     dev->mtu = max_t(int, mtu, IPV4_MIN_MTU);
0701 }
0702 
0703 /**
0704  * vti6_tnl_change - update the tunnel parameters
0705  *   @t: tunnel to be changed
0706  *   @p: tunnel configuration parameters
0707  *   @keep_mtu: MTU was set from userspace, don't re-compute it
0708  *
0709  * Description:
0710  *   vti6_tnl_change() updates the tunnel parameters
0711  **/
0712 static int
0713 vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
0714         bool keep_mtu)
0715 {
0716     t->parms.laddr = p->laddr;
0717     t->parms.raddr = p->raddr;
0718     t->parms.link = p->link;
0719     t->parms.i_key = p->i_key;
0720     t->parms.o_key = p->o_key;
0721     t->parms.proto = p->proto;
0722     t->parms.fwmark = p->fwmark;
0723     dst_cache_reset(&t->dst_cache);
0724     vti6_link_config(t, keep_mtu);
0725     return 0;
0726 }
0727 
0728 static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p,
0729                bool keep_mtu)
0730 {
0731     struct net *net = dev_net(t->dev);
0732     struct vti6_net *ip6n = net_generic(net, vti6_net_id);
0733     int err;
0734 
0735     vti6_tnl_unlink(ip6n, t);
0736     synchronize_net();
0737     err = vti6_tnl_change(t, p, keep_mtu);
0738     vti6_tnl_link(ip6n, t);
0739     netdev_state_change(t->dev);
0740     return err;
0741 }
0742 
0743 static void
0744 vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
0745 {
0746     p->laddr = u->laddr;
0747     p->raddr = u->raddr;
0748     p->link = u->link;
0749     p->i_key = u->i_key;
0750     p->o_key = u->o_key;
0751     p->proto = u->proto;
0752 
0753     memcpy(p->name, u->name, sizeof(u->name));
0754 }
0755 
0756 static void
0757 vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
0758 {
0759     u->laddr = p->laddr;
0760     u->raddr = p->raddr;
0761     u->link = p->link;
0762     u->i_key = p->i_key;
0763     u->o_key = p->o_key;
0764     if (u->i_key)
0765         u->i_flags |= GRE_KEY;
0766     if (u->o_key)
0767         u->o_flags |= GRE_KEY;
0768     u->proto = p->proto;
0769 
0770     memcpy(u->name, p->name, sizeof(u->name));
0771 }
0772 
0773 /**
0774  * vti6_siocdevprivate - configure vti6 tunnels from userspace
0775  *   @dev: virtual device associated with tunnel
0776  *   @ifr: unused
0777  *   @data: parameters passed from userspace
0778  *   @cmd: command to be performed
0779  *
0780  * Description:
0781  *   vti6_siocdevprivate() is used for managing vti6 tunnels
0782  *   from userspace.
0783  *
0784  *   The possible commands are the following:
0785  *     %SIOCGETTUNNEL: get tunnel parameters for device
0786  *     %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
0787  *     %SIOCCHGTUNNEL: change tunnel parameters to those given
0788  *     %SIOCDELTUNNEL: delete tunnel
0789  *
0790  *   The fallback device "ip6_vti0", created during module
0791  *   initialization, can be used for creating other tunnel devices.
0792  *
0793  * Return:
0794  *   0 on success,
0795  *   %-EFAULT if unable to copy data to or from userspace,
0796  *   %-EPERM if current process hasn't %CAP_NET_ADMIN set
0797  *   %-EINVAL if passed tunnel parameters are invalid,
0798  *   %-EEXIST if changing a tunnel's parameters would cause a conflict
0799  *   %-ENODEV if attempting to change or delete a nonexisting device
0800  **/
0801 static int
0802 vti6_siocdevprivate(struct net_device *dev, struct ifreq *ifr, void __user *data, int cmd)
0803 {
0804     int err = 0;
0805     struct ip6_tnl_parm2 p;
0806     struct __ip6_tnl_parm p1;
0807     struct ip6_tnl *t = NULL;
0808     struct net *net = dev_net(dev);
0809     struct vti6_net *ip6n = net_generic(net, vti6_net_id);
0810 
0811     memset(&p1, 0, sizeof(p1));
0812 
0813     switch (cmd) {
0814     case SIOCGETTUNNEL:
0815         if (dev == ip6n->fb_tnl_dev) {
0816             if (copy_from_user(&p, data, sizeof(p))) {
0817                 err = -EFAULT;
0818                 break;
0819             }
0820             vti6_parm_from_user(&p1, &p);
0821             t = vti6_locate(net, &p1, 0);
0822         } else {
0823             memset(&p, 0, sizeof(p));
0824         }
0825         if (!t)
0826             t = netdev_priv(dev);
0827         vti6_parm_to_user(&p, &t->parms);
0828         if (copy_to_user(data, &p, sizeof(p)))
0829             err = -EFAULT;
0830         break;
0831     case SIOCADDTUNNEL:
0832     case SIOCCHGTUNNEL:
0833         err = -EPERM;
0834         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
0835             break;
0836         err = -EFAULT;
0837         if (copy_from_user(&p, data, sizeof(p)))
0838             break;
0839         err = -EINVAL;
0840         if (p.proto != IPPROTO_IPV6  && p.proto != 0)
0841             break;
0842         vti6_parm_from_user(&p1, &p);
0843         t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
0844         if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
0845             if (t) {
0846                 if (t->dev != dev) {
0847                     err = -EEXIST;
0848                     break;
0849                 }
0850             } else
0851                 t = netdev_priv(dev);
0852 
0853             err = vti6_update(t, &p1, false);
0854         }
0855         if (t) {
0856             err = 0;
0857             vti6_parm_to_user(&p, &t->parms);
0858             if (copy_to_user(data, &p, sizeof(p)))
0859                 err = -EFAULT;
0860 
0861         } else
0862             err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
0863         break;
0864     case SIOCDELTUNNEL:
0865         err = -EPERM;
0866         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
0867             break;
0868 
0869         if (dev == ip6n->fb_tnl_dev) {
0870             err = -EFAULT;
0871             if (copy_from_user(&p, data, sizeof(p)))
0872                 break;
0873             err = -ENOENT;
0874             vti6_parm_from_user(&p1, &p);
0875             t = vti6_locate(net, &p1, 0);
0876             if (!t)
0877                 break;
0878             err = -EPERM;
0879             if (t->dev == ip6n->fb_tnl_dev)
0880                 break;
0881             dev = t->dev;
0882         }
0883         err = 0;
0884         unregister_netdevice(dev);
0885         break;
0886     default:
0887         err = -EINVAL;
0888     }
0889     return err;
0890 }
0891 
0892 static const struct net_device_ops vti6_netdev_ops = {
0893     .ndo_init   = vti6_dev_init,
0894     .ndo_uninit = vti6_dev_uninit,
0895     .ndo_start_xmit = vti6_tnl_xmit,
0896     .ndo_siocdevprivate = vti6_siocdevprivate,
0897     .ndo_get_stats64 = dev_get_tstats64,
0898     .ndo_get_iflink = ip6_tnl_get_iflink,
0899 };
0900 
0901 /**
0902  * vti6_dev_setup - setup virtual tunnel device
0903  *   @dev: virtual device associated with tunnel
0904  *
0905  * Description:
0906  *   Initialize function pointers and device parameters
0907  **/
0908 static void vti6_dev_setup(struct net_device *dev)
0909 {
0910     dev->netdev_ops = &vti6_netdev_ops;
0911     dev->header_ops = &ip_tunnel_header_ops;
0912     dev->needs_free_netdev = true;
0913     dev->priv_destructor = vti6_dev_free;
0914 
0915     dev->type = ARPHRD_TUNNEL6;
0916     dev->min_mtu = IPV4_MIN_MTU;
0917     dev->max_mtu = IP_MAX_MTU - sizeof(struct ipv6hdr);
0918     dev->flags |= IFF_NOARP;
0919     dev->addr_len = sizeof(struct in6_addr);
0920     netif_keep_dst(dev);
0921     /* This perm addr will be used as interface identifier by IPv6 */
0922     dev->addr_assign_type = NET_ADDR_RANDOM;
0923     eth_random_addr(dev->perm_addr);
0924 }
0925 
0926 /**
0927  * vti6_dev_init_gen - general initializer for all tunnel devices
0928  *   @dev: virtual device associated with tunnel
0929  **/
0930 static inline int vti6_dev_init_gen(struct net_device *dev)
0931 {
0932     struct ip6_tnl *t = netdev_priv(dev);
0933 
0934     t->dev = dev;
0935     t->net = dev_net(dev);
0936     dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
0937     if (!dev->tstats)
0938         return -ENOMEM;
0939     netdev_hold(dev, &t->dev_tracker, GFP_KERNEL);
0940     return 0;
0941 }
0942 
0943 /**
0944  * vti6_dev_init - initializer for all non fallback tunnel devices
0945  *   @dev: virtual device associated with tunnel
0946  **/
0947 static int vti6_dev_init(struct net_device *dev)
0948 {
0949     struct ip6_tnl *t = netdev_priv(dev);
0950     int err = vti6_dev_init_gen(dev);
0951 
0952     if (err)
0953         return err;
0954     vti6_link_config(t, true);
0955     return 0;
0956 }
0957 
0958 /**
0959  * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
0960  *   @dev: fallback device
0961  *
0962  * Return: 0
0963  **/
0964 static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
0965 {
0966     struct ip6_tnl *t = netdev_priv(dev);
0967     struct net *net = dev_net(dev);
0968     struct vti6_net *ip6n = net_generic(net, vti6_net_id);
0969 
0970     t->parms.proto = IPPROTO_IPV6;
0971 
0972     rcu_assign_pointer(ip6n->tnls_wc[0], t);
0973     return 0;
0974 }
0975 
0976 static int vti6_validate(struct nlattr *tb[], struct nlattr *data[],
0977              struct netlink_ext_ack *extack)
0978 {
0979     return 0;
0980 }
0981 
0982 static void vti6_netlink_parms(struct nlattr *data[],
0983                    struct __ip6_tnl_parm *parms)
0984 {
0985     memset(parms, 0, sizeof(*parms));
0986 
0987     if (!data)
0988         return;
0989 
0990     if (data[IFLA_VTI_LINK])
0991         parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
0992 
0993     if (data[IFLA_VTI_LOCAL])
0994         parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]);
0995 
0996     if (data[IFLA_VTI_REMOTE])
0997         parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]);
0998 
0999     if (data[IFLA_VTI_IKEY])
1000         parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
1001 
1002     if (data[IFLA_VTI_OKEY])
1003         parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
1004 
1005     if (data[IFLA_VTI_FWMARK])
1006         parms->fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
1007 }
1008 
1009 static int vti6_newlink(struct net *src_net, struct net_device *dev,
1010             struct nlattr *tb[], struct nlattr *data[],
1011             struct netlink_ext_ack *extack)
1012 {
1013     struct net *net = dev_net(dev);
1014     struct ip6_tnl *nt;
1015 
1016     nt = netdev_priv(dev);
1017     vti6_netlink_parms(data, &nt->parms);
1018 
1019     nt->parms.proto = IPPROTO_IPV6;
1020 
1021     if (vti6_locate(net, &nt->parms, 0))
1022         return -EEXIST;
1023 
1024     return vti6_tnl_create2(dev);
1025 }
1026 
1027 static void vti6_dellink(struct net_device *dev, struct list_head *head)
1028 {
1029     struct net *net = dev_net(dev);
1030     struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1031 
1032     if (dev != ip6n->fb_tnl_dev)
1033         unregister_netdevice_queue(dev, head);
1034 }
1035 
1036 static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
1037                struct nlattr *data[],
1038                struct netlink_ext_ack *extack)
1039 {
1040     struct ip6_tnl *t;
1041     struct __ip6_tnl_parm p;
1042     struct net *net = dev_net(dev);
1043     struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1044 
1045     if (dev == ip6n->fb_tnl_dev)
1046         return -EINVAL;
1047 
1048     vti6_netlink_parms(data, &p);
1049 
1050     t = vti6_locate(net, &p, 0);
1051 
1052     if (t) {
1053         if (t->dev != dev)
1054             return -EEXIST;
1055     } else
1056         t = netdev_priv(dev);
1057 
1058     return vti6_update(t, &p, tb && tb[IFLA_MTU]);
1059 }
1060 
1061 static size_t vti6_get_size(const struct net_device *dev)
1062 {
1063     return
1064         /* IFLA_VTI_LINK */
1065         nla_total_size(4) +
1066         /* IFLA_VTI_LOCAL */
1067         nla_total_size(sizeof(struct in6_addr)) +
1068         /* IFLA_VTI_REMOTE */
1069         nla_total_size(sizeof(struct in6_addr)) +
1070         /* IFLA_VTI_IKEY */
1071         nla_total_size(4) +
1072         /* IFLA_VTI_OKEY */
1073         nla_total_size(4) +
1074         /* IFLA_VTI_FWMARK */
1075         nla_total_size(4) +
1076         0;
1077 }
1078 
1079 static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1080 {
1081     struct ip6_tnl *tunnel = netdev_priv(dev);
1082     struct __ip6_tnl_parm *parm = &tunnel->parms;
1083 
1084     if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
1085         nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
1086         nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
1087         nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
1088         nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key) ||
1089         nla_put_u32(skb, IFLA_VTI_FWMARK, parm->fwmark))
1090         goto nla_put_failure;
1091     return 0;
1092 
1093 nla_put_failure:
1094     return -EMSGSIZE;
1095 }
1096 
1097 static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
1098     [IFLA_VTI_LINK]     = { .type = NLA_U32 },
1099     [IFLA_VTI_LOCAL]    = { .len = sizeof(struct in6_addr) },
1100     [IFLA_VTI_REMOTE]   = { .len = sizeof(struct in6_addr) },
1101     [IFLA_VTI_IKEY]     = { .type = NLA_U32 },
1102     [IFLA_VTI_OKEY]     = { .type = NLA_U32 },
1103     [IFLA_VTI_FWMARK]   = { .type = NLA_U32 },
1104 };
1105 
1106 static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1107     .kind       = "vti6",
1108     .maxtype    = IFLA_VTI_MAX,
1109     .policy     = vti6_policy,
1110     .priv_size  = sizeof(struct ip6_tnl),
1111     .setup      = vti6_dev_setup,
1112     .validate   = vti6_validate,
1113     .newlink    = vti6_newlink,
1114     .dellink    = vti6_dellink,
1115     .changelink = vti6_changelink,
1116     .get_size   = vti6_get_size,
1117     .fill_info  = vti6_fill_info,
1118     .get_link_net   = ip6_tnl_get_link_net,
1119 };
1120 
1121 static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n,
1122                         struct list_head *list)
1123 {
1124     int h;
1125     struct ip6_tnl *t;
1126 
1127     for (h = 0; h < IP6_VTI_HASH_SIZE; h++) {
1128         t = rtnl_dereference(ip6n->tnls_r_l[h]);
1129         while (t) {
1130             unregister_netdevice_queue(t->dev, list);
1131             t = rtnl_dereference(t->next);
1132         }
1133     }
1134 
1135     t = rtnl_dereference(ip6n->tnls_wc[0]);
1136     if (t)
1137         unregister_netdevice_queue(t->dev, list);
1138 }
1139 
1140 static int __net_init vti6_init_net(struct net *net)
1141 {
1142     struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1143     struct ip6_tnl *t = NULL;
1144     int err;
1145 
1146     ip6n->tnls[0] = ip6n->tnls_wc;
1147     ip6n->tnls[1] = ip6n->tnls_r_l;
1148 
1149     if (!net_has_fallback_tunnels(net))
1150         return 0;
1151     err = -ENOMEM;
1152     ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1153                     NET_NAME_UNKNOWN, vti6_dev_setup);
1154 
1155     if (!ip6n->fb_tnl_dev)
1156         goto err_alloc_dev;
1157     dev_net_set(ip6n->fb_tnl_dev, net);
1158     ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
1159 
1160     err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1161     if (err < 0)
1162         goto err_register;
1163 
1164     err = register_netdev(ip6n->fb_tnl_dev);
1165     if (err < 0)
1166         goto err_register;
1167 
1168     t = netdev_priv(ip6n->fb_tnl_dev);
1169 
1170     strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1171     return 0;
1172 
1173 err_register:
1174     free_netdev(ip6n->fb_tnl_dev);
1175 err_alloc_dev:
1176     return err;
1177 }
1178 
1179 static void __net_exit vti6_exit_batch_net(struct list_head *net_list)
1180 {
1181     struct vti6_net *ip6n;
1182     struct net *net;
1183     LIST_HEAD(list);
1184 
1185     rtnl_lock();
1186     list_for_each_entry(net, net_list, exit_list) {
1187         ip6n = net_generic(net, vti6_net_id);
1188         vti6_destroy_tunnels(ip6n, &list);
1189     }
1190     unregister_netdevice_many(&list);
1191     rtnl_unlock();
1192 }
1193 
1194 static struct pernet_operations vti6_net_ops = {
1195     .init = vti6_init_net,
1196     .exit_batch = vti6_exit_batch_net,
1197     .id   = &vti6_net_id,
1198     .size = sizeof(struct vti6_net),
1199 };
1200 
1201 static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1202     .handler    =   vti6_rcv,
1203     .input_handler  =   vti6_input_proto,
1204     .cb_handler =   vti6_rcv_cb,
1205     .err_handler    =   vti6_err,
1206     .priority   =   100,
1207 };
1208 
1209 static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1210     .handler    =   vti6_rcv,
1211     .input_handler  =   vti6_input_proto,
1212     .cb_handler =   vti6_rcv_cb,
1213     .err_handler    =   vti6_err,
1214     .priority   =   100,
1215 };
1216 
1217 static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1218     .handler    =   vti6_rcv,
1219     .input_handler  =   vti6_input_proto,
1220     .cb_handler =   vti6_rcv_cb,
1221     .err_handler    =   vti6_err,
1222     .priority   =   100,
1223 };
1224 
1225 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1226 static int vti6_rcv_tunnel(struct sk_buff *skb)
1227 {
1228     const xfrm_address_t *saddr;
1229     __be32 spi;
1230 
1231     saddr = (const xfrm_address_t *)&ipv6_hdr(skb)->saddr;
1232     spi = xfrm6_tunnel_spi_lookup(dev_net(skb->dev), saddr);
1233 
1234     return vti6_input_proto(skb, IPPROTO_IPV6, spi, 0);
1235 }
1236 
1237 static struct xfrm6_tunnel vti_ipv6_handler __read_mostly = {
1238     .handler    =   vti6_rcv_tunnel,
1239     .cb_handler =   vti6_rcv_cb,
1240     .err_handler    =   vti6_err,
1241     .priority   =   0,
1242 };
1243 
1244 static struct xfrm6_tunnel vti_ip6ip_handler __read_mostly = {
1245     .handler    =   vti6_rcv_tunnel,
1246     .cb_handler =   vti6_rcv_cb,
1247     .err_handler    =   vti6_err,
1248     .priority   =   0,
1249 };
1250 #endif
1251 
1252 /**
1253  * vti6_tunnel_init - register protocol and reserve needed resources
1254  *
1255  * Return: 0 on success
1256  **/
1257 static int __init vti6_tunnel_init(void)
1258 {
1259     const char *msg;
1260     int err;
1261 
1262     msg = "tunnel device";
1263     err = register_pernet_device(&vti6_net_ops);
1264     if (err < 0)
1265         goto pernet_dev_failed;
1266 
1267     msg = "tunnel protocols";
1268     err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1269     if (err < 0)
1270         goto xfrm_proto_esp_failed;
1271     err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1272     if (err < 0)
1273         goto xfrm_proto_ah_failed;
1274     err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1275     if (err < 0)
1276         goto xfrm_proto_comp_failed;
1277 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1278     msg = "ipv6 tunnel";
1279     err = xfrm6_tunnel_register(&vti_ipv6_handler, AF_INET6);
1280     if (err < 0)
1281         goto vti_tunnel_ipv6_failed;
1282     err = xfrm6_tunnel_register(&vti_ip6ip_handler, AF_INET);
1283     if (err < 0)
1284         goto vti_tunnel_ip6ip_failed;
1285 #endif
1286 
1287     msg = "netlink interface";
1288     err = rtnl_link_register(&vti6_link_ops);
1289     if (err < 0)
1290         goto rtnl_link_failed;
1291 
1292     return 0;
1293 
1294 rtnl_link_failed:
1295 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1296     err = xfrm6_tunnel_deregister(&vti_ip6ip_handler, AF_INET);
1297 vti_tunnel_ip6ip_failed:
1298     err = xfrm6_tunnel_deregister(&vti_ipv6_handler, AF_INET6);
1299 vti_tunnel_ipv6_failed:
1300 #endif
1301     xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1302 xfrm_proto_comp_failed:
1303     xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1304 xfrm_proto_ah_failed:
1305     xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1306 xfrm_proto_esp_failed:
1307     unregister_pernet_device(&vti6_net_ops);
1308 pernet_dev_failed:
1309     pr_err("vti6 init: failed to register %s\n", msg);
1310     return err;
1311 }
1312 
1313 /**
1314  * vti6_tunnel_cleanup - free resources and unregister protocol
1315  **/
1316 static void __exit vti6_tunnel_cleanup(void)
1317 {
1318     rtnl_link_unregister(&vti6_link_ops);
1319 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1320     xfrm6_tunnel_deregister(&vti_ip6ip_handler, AF_INET);
1321     xfrm6_tunnel_deregister(&vti_ipv6_handler, AF_INET6);
1322 #endif
1323     xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1324     xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1325     xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1326     unregister_pernet_device(&vti6_net_ops);
1327 }
1328 
1329 module_init(vti6_tunnel_init);
1330 module_exit(vti6_tunnel_cleanup);
1331 MODULE_LICENSE("GPL");
1332 MODULE_ALIAS_RTNL_LINK("vti6");
1333 MODULE_ALIAS_NETDEV("ip6_vti0");
1334 MODULE_AUTHOR("Steffen Klassert");
1335 MODULE_DESCRIPTION("IPv6 virtual tunnel interface");
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