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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *  GRE over IPv6 protocol decoder.
0004  *
0005  *  Authors: Dmitry Kozlov (xeb@mail.ru)
0006  */
0007 
0008 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0009 
0010 #include <linux/capability.h>
0011 #include <linux/module.h>
0012 #include <linux/types.h>
0013 #include <linux/kernel.h>
0014 #include <linux/slab.h>
0015 #include <linux/uaccess.h>
0016 #include <linux/skbuff.h>
0017 #include <linux/netdevice.h>
0018 #include <linux/in.h>
0019 #include <linux/tcp.h>
0020 #include <linux/udp.h>
0021 #include <linux/if_arp.h>
0022 #include <linux/init.h>
0023 #include <linux/in6.h>
0024 #include <linux/inetdevice.h>
0025 #include <linux/igmp.h>
0026 #include <linux/netfilter_ipv4.h>
0027 #include <linux/etherdevice.h>
0028 #include <linux/if_ether.h>
0029 #include <linux/hash.h>
0030 #include <linux/if_tunnel.h>
0031 #include <linux/ip6_tunnel.h>
0032 
0033 #include <net/sock.h>
0034 #include <net/ip.h>
0035 #include <net/ip_tunnels.h>
0036 #include <net/icmp.h>
0037 #include <net/protocol.h>
0038 #include <net/addrconf.h>
0039 #include <net/arp.h>
0040 #include <net/checksum.h>
0041 #include <net/dsfield.h>
0042 #include <net/inet_ecn.h>
0043 #include <net/xfrm.h>
0044 #include <net/net_namespace.h>
0045 #include <net/netns/generic.h>
0046 #include <net/rtnetlink.h>
0047 
0048 #include <net/ipv6.h>
0049 #include <net/ip6_fib.h>
0050 #include <net/ip6_route.h>
0051 #include <net/ip6_tunnel.h>
0052 #include <net/gre.h>
0053 #include <net/erspan.h>
0054 #include <net/dst_metadata.h>
0055 
0056 
0057 static bool log_ecn_error = true;
0058 module_param(log_ecn_error, bool, 0644);
0059 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
0060 
0061 #define IP6_GRE_HASH_SIZE_SHIFT  5
0062 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
0063 
0064 static unsigned int ip6gre_net_id __read_mostly;
0065 struct ip6gre_net {
0066     struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
0067 
0068     struct ip6_tnl __rcu *collect_md_tun;
0069     struct ip6_tnl __rcu *collect_md_tun_erspan;
0070     struct net_device *fb_tunnel_dev;
0071 };
0072 
0073 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
0074 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
0075 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
0076 static int ip6gre_tunnel_init(struct net_device *dev);
0077 static void ip6gre_tunnel_setup(struct net_device *dev);
0078 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
0079 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
0080 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
0081 
0082 /* Tunnel hash table */
0083 
0084 /*
0085    4 hash tables:
0086 
0087    3: (remote,local)
0088    2: (remote,*)
0089    1: (*,local)
0090    0: (*,*)
0091 
0092    We require exact key match i.e. if a key is present in packet
0093    it will match only tunnel with the same key; if it is not present,
0094    it will match only keyless tunnel.
0095 
0096    All keysless packets, if not matched configured keyless tunnels
0097    will match fallback tunnel.
0098  */
0099 
0100 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
0101 static u32 HASH_ADDR(const struct in6_addr *addr)
0102 {
0103     u32 hash = ipv6_addr_hash(addr);
0104 
0105     return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
0106 }
0107 
0108 #define tunnels_r_l tunnels[3]
0109 #define tunnels_r   tunnels[2]
0110 #define tunnels_l   tunnels[1]
0111 #define tunnels_wc  tunnels[0]
0112 
0113 /* Given src, dst and key, find appropriate for input tunnel. */
0114 
0115 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
0116         const struct in6_addr *remote, const struct in6_addr *local,
0117         __be32 key, __be16 gre_proto)
0118 {
0119     struct net *net = dev_net(dev);
0120     int link = dev->ifindex;
0121     unsigned int h0 = HASH_ADDR(remote);
0122     unsigned int h1 = HASH_KEY(key);
0123     struct ip6_tnl *t, *cand = NULL;
0124     struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
0125     int dev_type = (gre_proto == htons(ETH_P_TEB) ||
0126             gre_proto == htons(ETH_P_ERSPAN) ||
0127             gre_proto == htons(ETH_P_ERSPAN2)) ?
0128                ARPHRD_ETHER : ARPHRD_IP6GRE;
0129     int score, cand_score = 4;
0130     struct net_device *ndev;
0131 
0132     for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
0133         if (!ipv6_addr_equal(local, &t->parms.laddr) ||
0134             !ipv6_addr_equal(remote, &t->parms.raddr) ||
0135             key != t->parms.i_key ||
0136             !(t->dev->flags & IFF_UP))
0137             continue;
0138 
0139         if (t->dev->type != ARPHRD_IP6GRE &&
0140             t->dev->type != dev_type)
0141             continue;
0142 
0143         score = 0;
0144         if (t->parms.link != link)
0145             score |= 1;
0146         if (t->dev->type != dev_type)
0147             score |= 2;
0148         if (score == 0)
0149             return t;
0150 
0151         if (score < cand_score) {
0152             cand = t;
0153             cand_score = score;
0154         }
0155     }
0156 
0157     for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
0158         if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
0159             key != t->parms.i_key ||
0160             !(t->dev->flags & IFF_UP))
0161             continue;
0162 
0163         if (t->dev->type != ARPHRD_IP6GRE &&
0164             t->dev->type != dev_type)
0165             continue;
0166 
0167         score = 0;
0168         if (t->parms.link != link)
0169             score |= 1;
0170         if (t->dev->type != dev_type)
0171             score |= 2;
0172         if (score == 0)
0173             return t;
0174 
0175         if (score < cand_score) {
0176             cand = t;
0177             cand_score = score;
0178         }
0179     }
0180 
0181     for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
0182         if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
0183               (!ipv6_addr_equal(local, &t->parms.raddr) ||
0184                  !ipv6_addr_is_multicast(local))) ||
0185             key != t->parms.i_key ||
0186             !(t->dev->flags & IFF_UP))
0187             continue;
0188 
0189         if (t->dev->type != ARPHRD_IP6GRE &&
0190             t->dev->type != dev_type)
0191             continue;
0192 
0193         score = 0;
0194         if (t->parms.link != link)
0195             score |= 1;
0196         if (t->dev->type != dev_type)
0197             score |= 2;
0198         if (score == 0)
0199             return t;
0200 
0201         if (score < cand_score) {
0202             cand = t;
0203             cand_score = score;
0204         }
0205     }
0206 
0207     for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
0208         if (t->parms.i_key != key ||
0209             !(t->dev->flags & IFF_UP))
0210             continue;
0211 
0212         if (t->dev->type != ARPHRD_IP6GRE &&
0213             t->dev->type != dev_type)
0214             continue;
0215 
0216         score = 0;
0217         if (t->parms.link != link)
0218             score |= 1;
0219         if (t->dev->type != dev_type)
0220             score |= 2;
0221         if (score == 0)
0222             return t;
0223 
0224         if (score < cand_score) {
0225             cand = t;
0226             cand_score = score;
0227         }
0228     }
0229 
0230     if (cand)
0231         return cand;
0232 
0233     if (gre_proto == htons(ETH_P_ERSPAN) ||
0234         gre_proto == htons(ETH_P_ERSPAN2))
0235         t = rcu_dereference(ign->collect_md_tun_erspan);
0236     else
0237         t = rcu_dereference(ign->collect_md_tun);
0238 
0239     if (t && t->dev->flags & IFF_UP)
0240         return t;
0241 
0242     ndev = READ_ONCE(ign->fb_tunnel_dev);
0243     if (ndev && ndev->flags & IFF_UP)
0244         return netdev_priv(ndev);
0245 
0246     return NULL;
0247 }
0248 
0249 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
0250         const struct __ip6_tnl_parm *p)
0251 {
0252     const struct in6_addr *remote = &p->raddr;
0253     const struct in6_addr *local = &p->laddr;
0254     unsigned int h = HASH_KEY(p->i_key);
0255     int prio = 0;
0256 
0257     if (!ipv6_addr_any(local))
0258         prio |= 1;
0259     if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
0260         prio |= 2;
0261         h ^= HASH_ADDR(remote);
0262     }
0263 
0264     return &ign->tunnels[prio][h];
0265 }
0266 
0267 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
0268 {
0269     if (t->parms.collect_md)
0270         rcu_assign_pointer(ign->collect_md_tun, t);
0271 }
0272 
0273 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
0274 {
0275     if (t->parms.collect_md)
0276         rcu_assign_pointer(ign->collect_md_tun_erspan, t);
0277 }
0278 
0279 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
0280 {
0281     if (t->parms.collect_md)
0282         rcu_assign_pointer(ign->collect_md_tun, NULL);
0283 }
0284 
0285 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
0286                        struct ip6_tnl *t)
0287 {
0288     if (t->parms.collect_md)
0289         rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
0290 }
0291 
0292 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
0293         const struct ip6_tnl *t)
0294 {
0295     return __ip6gre_bucket(ign, &t->parms);
0296 }
0297 
0298 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
0299 {
0300     struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
0301 
0302     rcu_assign_pointer(t->next, rtnl_dereference(*tp));
0303     rcu_assign_pointer(*tp, t);
0304 }
0305 
0306 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
0307 {
0308     struct ip6_tnl __rcu **tp;
0309     struct ip6_tnl *iter;
0310 
0311     for (tp = ip6gre_bucket(ign, t);
0312          (iter = rtnl_dereference(*tp)) != NULL;
0313          tp = &iter->next) {
0314         if (t == iter) {
0315             rcu_assign_pointer(*tp, t->next);
0316             break;
0317         }
0318     }
0319 }
0320 
0321 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
0322                        const struct __ip6_tnl_parm *parms,
0323                        int type)
0324 {
0325     const struct in6_addr *remote = &parms->raddr;
0326     const struct in6_addr *local = &parms->laddr;
0327     __be32 key = parms->i_key;
0328     int link = parms->link;
0329     struct ip6_tnl *t;
0330     struct ip6_tnl __rcu **tp;
0331     struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
0332 
0333     for (tp = __ip6gre_bucket(ign, parms);
0334          (t = rtnl_dereference(*tp)) != NULL;
0335          tp = &t->next)
0336         if (ipv6_addr_equal(local, &t->parms.laddr) &&
0337             ipv6_addr_equal(remote, &t->parms.raddr) &&
0338             key == t->parms.i_key &&
0339             link == t->parms.link &&
0340             type == t->dev->type)
0341             break;
0342 
0343     return t;
0344 }
0345 
0346 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
0347         const struct __ip6_tnl_parm *parms, int create)
0348 {
0349     struct ip6_tnl *t, *nt;
0350     struct net_device *dev;
0351     char name[IFNAMSIZ];
0352     struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
0353 
0354     t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
0355     if (t && create)
0356         return NULL;
0357     if (t || !create)
0358         return t;
0359 
0360     if (parms->name[0]) {
0361         if (!dev_valid_name(parms->name))
0362             return NULL;
0363         strlcpy(name, parms->name, IFNAMSIZ);
0364     } else {
0365         strcpy(name, "ip6gre%d");
0366     }
0367     dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
0368                ip6gre_tunnel_setup);
0369     if (!dev)
0370         return NULL;
0371 
0372     dev_net_set(dev, net);
0373 
0374     nt = netdev_priv(dev);
0375     nt->parms = *parms;
0376     dev->rtnl_link_ops = &ip6gre_link_ops;
0377 
0378     nt->dev = dev;
0379     nt->net = dev_net(dev);
0380 
0381     if (register_netdevice(dev) < 0)
0382         goto failed_free;
0383 
0384     ip6gre_tnl_link_config(nt, 1);
0385     ip6gre_tunnel_link(ign, nt);
0386     return nt;
0387 
0388 failed_free:
0389     free_netdev(dev);
0390     return NULL;
0391 }
0392 
0393 static void ip6erspan_tunnel_uninit(struct net_device *dev)
0394 {
0395     struct ip6_tnl *t = netdev_priv(dev);
0396     struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
0397 
0398     ip6erspan_tunnel_unlink_md(ign, t);
0399     ip6gre_tunnel_unlink(ign, t);
0400     dst_cache_reset(&t->dst_cache);
0401     netdev_put(dev, &t->dev_tracker);
0402 }
0403 
0404 static void ip6gre_tunnel_uninit(struct net_device *dev)
0405 {
0406     struct ip6_tnl *t = netdev_priv(dev);
0407     struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
0408 
0409     ip6gre_tunnel_unlink_md(ign, t);
0410     ip6gre_tunnel_unlink(ign, t);
0411     if (ign->fb_tunnel_dev == dev)
0412         WRITE_ONCE(ign->fb_tunnel_dev, NULL);
0413     dst_cache_reset(&t->dst_cache);
0414     netdev_put(dev, &t->dev_tracker);
0415 }
0416 
0417 
0418 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
0419                u8 type, u8 code, int offset, __be32 info)
0420 {
0421     struct net *net = dev_net(skb->dev);
0422     const struct ipv6hdr *ipv6h;
0423     struct tnl_ptk_info tpi;
0424     struct ip6_tnl *t;
0425 
0426     if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
0427                  offset) < 0)
0428         return -EINVAL;
0429 
0430     ipv6h = (const struct ipv6hdr *)skb->data;
0431     t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
0432                  tpi.key, tpi.proto);
0433     if (!t)
0434         return -ENOENT;
0435 
0436     switch (type) {
0437     case ICMPV6_DEST_UNREACH:
0438         net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
0439                     t->parms.name);
0440         if (code != ICMPV6_PORT_UNREACH)
0441             break;
0442         return 0;
0443     case ICMPV6_TIME_EXCEED:
0444         if (code == ICMPV6_EXC_HOPLIMIT) {
0445             net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
0446                         t->parms.name);
0447             break;
0448         }
0449         return 0;
0450     case ICMPV6_PARAMPROB: {
0451         struct ipv6_tlv_tnl_enc_lim *tel;
0452         __u32 teli;
0453 
0454         teli = 0;
0455         if (code == ICMPV6_HDR_FIELD)
0456             teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
0457 
0458         if (teli && teli == be32_to_cpu(info) - 2) {
0459             tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
0460             if (tel->encap_limit == 0) {
0461                 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
0462                             t->parms.name);
0463             }
0464         } else {
0465             net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
0466                         t->parms.name);
0467         }
0468         return 0;
0469     }
0470     case ICMPV6_PKT_TOOBIG:
0471         ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
0472         return 0;
0473     case NDISC_REDIRECT:
0474         ip6_redirect(skb, net, skb->dev->ifindex, 0,
0475                  sock_net_uid(net, NULL));
0476         return 0;
0477     }
0478 
0479     if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
0480         t->err_count++;
0481     else
0482         t->err_count = 1;
0483     t->err_time = jiffies;
0484 
0485     return 0;
0486 }
0487 
0488 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
0489 {
0490     const struct ipv6hdr *ipv6h;
0491     struct ip6_tnl *tunnel;
0492 
0493     ipv6h = ipv6_hdr(skb);
0494     tunnel = ip6gre_tunnel_lookup(skb->dev,
0495                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
0496                       tpi->proto);
0497     if (tunnel) {
0498         if (tunnel->parms.collect_md) {
0499             struct metadata_dst *tun_dst;
0500             __be64 tun_id;
0501             __be16 flags;
0502 
0503             flags = tpi->flags;
0504             tun_id = key32_to_tunnel_id(tpi->key);
0505 
0506             tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
0507             if (!tun_dst)
0508                 return PACKET_REJECT;
0509 
0510             ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
0511         } else {
0512             ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
0513         }
0514 
0515         return PACKET_RCVD;
0516     }
0517 
0518     return PACKET_REJECT;
0519 }
0520 
0521 static int ip6erspan_rcv(struct sk_buff *skb,
0522              struct tnl_ptk_info *tpi,
0523              int gre_hdr_len)
0524 {
0525     struct erspan_base_hdr *ershdr;
0526     const struct ipv6hdr *ipv6h;
0527     struct erspan_md2 *md2;
0528     struct ip6_tnl *tunnel;
0529     u8 ver;
0530 
0531     ipv6h = ipv6_hdr(skb);
0532     ershdr = (struct erspan_base_hdr *)skb->data;
0533     ver = ershdr->ver;
0534 
0535     tunnel = ip6gre_tunnel_lookup(skb->dev,
0536                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
0537                       tpi->proto);
0538     if (tunnel) {
0539         int len = erspan_hdr_len(ver);
0540 
0541         if (unlikely(!pskb_may_pull(skb, len)))
0542             return PACKET_REJECT;
0543 
0544         if (__iptunnel_pull_header(skb, len,
0545                        htons(ETH_P_TEB),
0546                        false, false) < 0)
0547             return PACKET_REJECT;
0548 
0549         if (tunnel->parms.collect_md) {
0550             struct erspan_metadata *pkt_md, *md;
0551             struct metadata_dst *tun_dst;
0552             struct ip_tunnel_info *info;
0553             unsigned char *gh;
0554             __be64 tun_id;
0555             __be16 flags;
0556 
0557             tpi->flags |= TUNNEL_KEY;
0558             flags = tpi->flags;
0559             tun_id = key32_to_tunnel_id(tpi->key);
0560 
0561             tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
0562                           sizeof(*md));
0563             if (!tun_dst)
0564                 return PACKET_REJECT;
0565 
0566             /* skb can be uncloned in __iptunnel_pull_header, so
0567              * old pkt_md is no longer valid and we need to reset
0568              * it
0569              */
0570             gh = skb_network_header(skb) +
0571                  skb_network_header_len(skb);
0572             pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
0573                                 sizeof(*ershdr));
0574             info = &tun_dst->u.tun_info;
0575             md = ip_tunnel_info_opts(info);
0576             md->version = ver;
0577             md2 = &md->u.md2;
0578             memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
0579                                ERSPAN_V2_MDSIZE);
0580             info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
0581             info->options_len = sizeof(*md);
0582 
0583             ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
0584 
0585         } else {
0586             ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
0587         }
0588 
0589         return PACKET_RCVD;
0590     }
0591 
0592     return PACKET_REJECT;
0593 }
0594 
0595 static int gre_rcv(struct sk_buff *skb)
0596 {
0597     struct tnl_ptk_info tpi;
0598     bool csum_err = false;
0599     int hdr_len;
0600 
0601     hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
0602     if (hdr_len < 0)
0603         goto drop;
0604 
0605     if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
0606         goto drop;
0607 
0608     if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
0609              tpi.proto == htons(ETH_P_ERSPAN2))) {
0610         if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
0611             return 0;
0612         goto out;
0613     }
0614 
0615     if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
0616         return 0;
0617 
0618 out:
0619     icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
0620 drop:
0621     kfree_skb(skb);
0622     return 0;
0623 }
0624 
0625 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
0626 {
0627     return iptunnel_handle_offloads(skb,
0628                     csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
0629 }
0630 
0631 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
0632                      struct net_device *dev,
0633                      struct flowi6 *fl6, __u8 *dsfield,
0634                      int *encap_limit)
0635 {
0636     const struct iphdr *iph = ip_hdr(skb);
0637     struct ip6_tnl *t = netdev_priv(dev);
0638 
0639     if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
0640         *encap_limit = t->parms.encap_limit;
0641 
0642     memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
0643 
0644     if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
0645         *dsfield = ipv4_get_dsfield(iph);
0646     else
0647         *dsfield = ip6_tclass(t->parms.flowinfo);
0648 
0649     if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
0650         fl6->flowi6_mark = skb->mark;
0651     else
0652         fl6->flowi6_mark = t->parms.fwmark;
0653 
0654     fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
0655 }
0656 
0657 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
0658                     struct net_device *dev,
0659                     struct flowi6 *fl6, __u8 *dsfield,
0660                     int *encap_limit)
0661 {
0662     struct ipv6hdr *ipv6h;
0663     struct ip6_tnl *t = netdev_priv(dev);
0664     __u16 offset;
0665 
0666     offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
0667     /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
0668     ipv6h = ipv6_hdr(skb);
0669 
0670     if (offset > 0) {
0671         struct ipv6_tlv_tnl_enc_lim *tel;
0672 
0673         tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
0674         if (tel->encap_limit == 0) {
0675             icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
0676                     ICMPV6_HDR_FIELD, offset + 2);
0677             return -1;
0678         }
0679         *encap_limit = tel->encap_limit - 1;
0680     } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
0681         *encap_limit = t->parms.encap_limit;
0682     }
0683 
0684     memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
0685 
0686     if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
0687         *dsfield = ipv6_get_dsfield(ipv6h);
0688     else
0689         *dsfield = ip6_tclass(t->parms.flowinfo);
0690 
0691     if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
0692         fl6->flowlabel |= ip6_flowlabel(ipv6h);
0693 
0694     if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
0695         fl6->flowi6_mark = skb->mark;
0696     else
0697         fl6->flowi6_mark = t->parms.fwmark;
0698 
0699     fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
0700 
0701     return 0;
0702 }
0703 
0704 static int prepare_ip6gre_xmit_other(struct sk_buff *skb,
0705                      struct net_device *dev,
0706                      struct flowi6 *fl6, __u8 *dsfield,
0707                      int *encap_limit)
0708 {
0709     struct ip6_tnl *t = netdev_priv(dev);
0710 
0711     if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
0712         *encap_limit = t->parms.encap_limit;
0713 
0714     memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
0715 
0716     if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
0717         *dsfield = 0;
0718     else
0719         *dsfield = ip6_tclass(t->parms.flowinfo);
0720 
0721     if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
0722         fl6->flowi6_mark = skb->mark;
0723     else
0724         fl6->flowi6_mark = t->parms.fwmark;
0725 
0726     fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
0727 
0728     return 0;
0729 }
0730 
0731 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
0732 {
0733     struct ip_tunnel_info *tun_info;
0734 
0735     tun_info = skb_tunnel_info(skb);
0736     if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
0737         return ERR_PTR(-EINVAL);
0738 
0739     return tun_info;
0740 }
0741 
0742 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
0743                    struct net_device *dev, __u8 dsfield,
0744                    struct flowi6 *fl6, int encap_limit,
0745                    __u32 *pmtu, __be16 proto)
0746 {
0747     struct ip6_tnl *tunnel = netdev_priv(dev);
0748     __be16 protocol;
0749     __be16 flags;
0750 
0751     if (dev->type == ARPHRD_ETHER)
0752         IPCB(skb)->flags = 0;
0753 
0754     if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
0755         fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
0756     else
0757         fl6->daddr = tunnel->parms.raddr;
0758 
0759     /* Push GRE header. */
0760     protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
0761 
0762     if (tunnel->parms.collect_md) {
0763         struct ip_tunnel_info *tun_info;
0764         const struct ip_tunnel_key *key;
0765         int tun_hlen;
0766 
0767         tun_info = skb_tunnel_info_txcheck(skb);
0768         if (IS_ERR(tun_info) ||
0769             unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
0770             return -EINVAL;
0771 
0772         key = &tun_info->key;
0773         memset(fl6, 0, sizeof(*fl6));
0774         fl6->flowi6_proto = IPPROTO_GRE;
0775         fl6->daddr = key->u.ipv6.dst;
0776         fl6->flowlabel = key->label;
0777         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
0778         fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
0779 
0780         dsfield = key->tos;
0781         flags = key->tun_flags &
0782             (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
0783         tun_hlen = gre_calc_hlen(flags);
0784 
0785         if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
0786             return -ENOMEM;
0787 
0788         gre_build_header(skb, tun_hlen,
0789                  flags, protocol,
0790                  tunnel_id_to_key32(tun_info->key.tun_id),
0791                  (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
0792                               : 0);
0793 
0794     } else {
0795         if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
0796             return -ENOMEM;
0797 
0798         flags = tunnel->parms.o_flags;
0799 
0800         gre_build_header(skb, tunnel->tun_hlen, flags,
0801                  protocol, tunnel->parms.o_key,
0802                  (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
0803                               : 0);
0804     }
0805 
0806     return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
0807                 NEXTHDR_GRE);
0808 }
0809 
0810 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
0811 {
0812     struct ip6_tnl *t = netdev_priv(dev);
0813     int encap_limit = -1;
0814     struct flowi6 fl6;
0815     __u8 dsfield = 0;
0816     __u32 mtu;
0817     int err;
0818 
0819     memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
0820 
0821     if (!t->parms.collect_md)
0822         prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
0823                      &dsfield, &encap_limit);
0824 
0825     err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
0826     if (err)
0827         return -1;
0828 
0829     err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
0830               skb->protocol);
0831     if (err != 0) {
0832         /* XXX: send ICMP error even if DF is not set. */
0833         if (err == -EMSGSIZE)
0834             icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
0835                       htonl(mtu));
0836         return -1;
0837     }
0838 
0839     return 0;
0840 }
0841 
0842 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
0843 {
0844     struct ip6_tnl *t = netdev_priv(dev);
0845     struct ipv6hdr *ipv6h = ipv6_hdr(skb);
0846     int encap_limit = -1;
0847     struct flowi6 fl6;
0848     __u8 dsfield = 0;
0849     __u32 mtu;
0850     int err;
0851 
0852     if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
0853         return -1;
0854 
0855     if (!t->parms.collect_md &&
0856         prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
0857         return -1;
0858 
0859     if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
0860         return -1;
0861 
0862     err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
0863               &mtu, skb->protocol);
0864     if (err != 0) {
0865         if (err == -EMSGSIZE)
0866             icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
0867         return -1;
0868     }
0869 
0870     return 0;
0871 }
0872 
0873 /**
0874  * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
0875  *   @t: the outgoing tunnel device
0876  *   @hdr: IPv6 header from the incoming packet
0877  *
0878  * Description:
0879  *   Avoid trivial tunneling loop by checking that tunnel exit-point
0880  *   doesn't match source of incoming packet.
0881  *
0882  * Return:
0883  *   1 if conflict,
0884  *   0 else
0885  **/
0886 
0887 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
0888     const struct ipv6hdr *hdr)
0889 {
0890     return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
0891 }
0892 
0893 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
0894 {
0895     struct ip6_tnl *t = netdev_priv(dev);
0896     int encap_limit = -1;
0897     struct flowi6 fl6;
0898     __u8 dsfield = 0;
0899     __u32 mtu;
0900     int err;
0901 
0902     if (!t->parms.collect_md &&
0903         prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit))
0904         return -1;
0905 
0906     err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
0907     if (err)
0908         return err;
0909     err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol);
0910 
0911     return err;
0912 }
0913 
0914 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
0915     struct net_device *dev)
0916 {
0917     struct ip6_tnl *t = netdev_priv(dev);
0918     struct net_device_stats *stats = &t->dev->stats;
0919     __be16 payload_protocol;
0920     int ret;
0921 
0922     if (!pskb_inet_may_pull(skb))
0923         goto tx_err;
0924 
0925     if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
0926         goto tx_err;
0927 
0928     payload_protocol = skb_protocol(skb, true);
0929     switch (payload_protocol) {
0930     case htons(ETH_P_IP):
0931         ret = ip6gre_xmit_ipv4(skb, dev);
0932         break;
0933     case htons(ETH_P_IPV6):
0934         ret = ip6gre_xmit_ipv6(skb, dev);
0935         break;
0936     default:
0937         ret = ip6gre_xmit_other(skb, dev);
0938         break;
0939     }
0940 
0941     if (ret < 0)
0942         goto tx_err;
0943 
0944     return NETDEV_TX_OK;
0945 
0946 tx_err:
0947     if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
0948         stats->tx_errors++;
0949     stats->tx_dropped++;
0950     kfree_skb(skb);
0951     return NETDEV_TX_OK;
0952 }
0953 
0954 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
0955                      struct net_device *dev)
0956 {
0957     struct ip_tunnel_info *tun_info = NULL;
0958     struct ip6_tnl *t = netdev_priv(dev);
0959     struct dst_entry *dst = skb_dst(skb);
0960     struct net_device_stats *stats;
0961     bool truncate = false;
0962     int encap_limit = -1;
0963     __u8 dsfield = false;
0964     struct flowi6 fl6;
0965     int err = -EINVAL;
0966     __be16 proto;
0967     __u32 mtu;
0968     int nhoff;
0969 
0970     if (!pskb_inet_may_pull(skb))
0971         goto tx_err;
0972 
0973     if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
0974         goto tx_err;
0975 
0976     if (gre_handle_offloads(skb, false))
0977         goto tx_err;
0978 
0979     if (skb->len > dev->mtu + dev->hard_header_len) {
0980         pskb_trim(skb, dev->mtu + dev->hard_header_len);
0981         truncate = true;
0982     }
0983 
0984     nhoff = skb_network_header(skb) - skb_mac_header(skb);
0985     if (skb->protocol == htons(ETH_P_IP) &&
0986         (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
0987         truncate = true;
0988 
0989     if (skb->protocol == htons(ETH_P_IPV6)) {
0990         int thoff;
0991 
0992         if (skb_transport_header_was_set(skb))
0993             thoff = skb_transport_header(skb) - skb_mac_header(skb);
0994         else
0995             thoff = nhoff + sizeof(struct ipv6hdr);
0996         if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
0997             truncate = true;
0998     }
0999 
1000     if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
1001         goto tx_err;
1002 
1003     t->parms.o_flags &= ~TUNNEL_KEY;
1004     IPCB(skb)->flags = 0;
1005 
1006     /* For collect_md mode, derive fl6 from the tunnel key,
1007      * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
1008      */
1009     if (t->parms.collect_md) {
1010         const struct ip_tunnel_key *key;
1011         struct erspan_metadata *md;
1012         __be32 tun_id;
1013 
1014         tun_info = skb_tunnel_info_txcheck(skb);
1015         if (IS_ERR(tun_info) ||
1016             unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
1017             goto tx_err;
1018 
1019         key = &tun_info->key;
1020         memset(&fl6, 0, sizeof(fl6));
1021         fl6.flowi6_proto = IPPROTO_GRE;
1022         fl6.daddr = key->u.ipv6.dst;
1023         fl6.flowlabel = key->label;
1024         fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1025         fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
1026 
1027         dsfield = key->tos;
1028         if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
1029             goto tx_err;
1030         if (tun_info->options_len < sizeof(*md))
1031             goto tx_err;
1032         md = ip_tunnel_info_opts(tun_info);
1033 
1034         tun_id = tunnel_id_to_key32(key->tun_id);
1035         if (md->version == 1) {
1036             erspan_build_header(skb,
1037                         ntohl(tun_id),
1038                         ntohl(md->u.index), truncate,
1039                         false);
1040         } else if (md->version == 2) {
1041             erspan_build_header_v2(skb,
1042                            ntohl(tun_id),
1043                            md->u.md2.dir,
1044                            get_hwid(&md->u.md2),
1045                            truncate, false);
1046         } else {
1047             goto tx_err;
1048         }
1049     } else {
1050         switch (skb->protocol) {
1051         case htons(ETH_P_IP):
1052             memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1053             prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1054                          &dsfield, &encap_limit);
1055             break;
1056         case htons(ETH_P_IPV6):
1057             if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1058                 goto tx_err;
1059             if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1060                              &dsfield, &encap_limit))
1061                 goto tx_err;
1062             break;
1063         default:
1064             memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1065             break;
1066         }
1067 
1068         if (t->parms.erspan_ver == 1)
1069             erspan_build_header(skb, ntohl(t->parms.o_key),
1070                         t->parms.index,
1071                         truncate, false);
1072         else if (t->parms.erspan_ver == 2)
1073             erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1074                            t->parms.dir,
1075                            t->parms.hwid,
1076                            truncate, false);
1077         else
1078             goto tx_err;
1079 
1080         fl6.daddr = t->parms.raddr;
1081     }
1082 
1083     /* Push GRE header. */
1084     proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1085                        : htons(ETH_P_ERSPAN2);
1086     gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno)));
1087 
1088     /* TooBig packet may have updated dst->dev's mtu */
1089     if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1090         dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1091 
1092     err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1093                NEXTHDR_GRE);
1094     if (err != 0) {
1095         /* XXX: send ICMP error even if DF is not set. */
1096         if (err == -EMSGSIZE) {
1097             if (skb->protocol == htons(ETH_P_IP))
1098                 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1099                           ICMP_FRAG_NEEDED, htonl(mtu));
1100             else
1101                 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1102         }
1103 
1104         goto tx_err;
1105     }
1106     return NETDEV_TX_OK;
1107 
1108 tx_err:
1109     stats = &t->dev->stats;
1110     if (!IS_ERR(tun_info))
1111         stats->tx_errors++;
1112     stats->tx_dropped++;
1113     kfree_skb(skb);
1114     return NETDEV_TX_OK;
1115 }
1116 
1117 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1118 {
1119     struct net_device *dev = t->dev;
1120     struct __ip6_tnl_parm *p = &t->parms;
1121     struct flowi6 *fl6 = &t->fl.u.ip6;
1122 
1123     if (dev->type != ARPHRD_ETHER) {
1124         __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1125         memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1126     }
1127 
1128     /* Set up flowi template */
1129     fl6->saddr = p->laddr;
1130     fl6->daddr = p->raddr;
1131     fl6->flowi6_oif = p->link;
1132     fl6->flowlabel = 0;
1133     fl6->flowi6_proto = IPPROTO_GRE;
1134     fl6->fl6_gre_key = t->parms.o_key;
1135 
1136     if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1137         fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1138     if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1139         fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1140 
1141     p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1142     p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1143 
1144     if (p->flags&IP6_TNL_F_CAP_XMIT &&
1145             p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1146         dev->flags |= IFF_POINTOPOINT;
1147     else
1148         dev->flags &= ~IFF_POINTOPOINT;
1149 }
1150 
1151 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1152                      int t_hlen)
1153 {
1154     const struct __ip6_tnl_parm *p = &t->parms;
1155     struct net_device *dev = t->dev;
1156 
1157     if (p->flags & IP6_TNL_F_CAP_XMIT) {
1158         int strict = (ipv6_addr_type(&p->raddr) &
1159                   (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1160 
1161         struct rt6_info *rt = rt6_lookup(t->net,
1162                          &p->raddr, &p->laddr,
1163                          p->link, NULL, strict);
1164 
1165         if (!rt)
1166             return;
1167 
1168         if (rt->dst.dev) {
1169             unsigned short dst_len = rt->dst.dev->hard_header_len +
1170                          t_hlen;
1171 
1172             if (t->dev->header_ops)
1173                 dev->hard_header_len = dst_len;
1174             else
1175                 dev->needed_headroom = dst_len;
1176 
1177             if (set_mtu) {
1178                 dev->mtu = rt->dst.dev->mtu - t_hlen;
1179                 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1180                     dev->mtu -= 8;
1181                 if (dev->type == ARPHRD_ETHER)
1182                     dev->mtu -= ETH_HLEN;
1183 
1184                 if (dev->mtu < IPV6_MIN_MTU)
1185                     dev->mtu = IPV6_MIN_MTU;
1186             }
1187         }
1188         ip6_rt_put(rt);
1189     }
1190 }
1191 
1192 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1193 {
1194     int t_hlen;
1195 
1196     tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1197     tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1198 
1199     t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1200 
1201     if (tunnel->dev->header_ops)
1202         tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1203     else
1204         tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1205 
1206     return t_hlen;
1207 }
1208 
1209 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1210 {
1211     ip6gre_tnl_link_config_common(t);
1212     ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1213 }
1214 
1215 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1216                      const struct __ip6_tnl_parm *p)
1217 {
1218     t->parms.laddr = p->laddr;
1219     t->parms.raddr = p->raddr;
1220     t->parms.flags = p->flags;
1221     t->parms.hop_limit = p->hop_limit;
1222     t->parms.encap_limit = p->encap_limit;
1223     t->parms.flowinfo = p->flowinfo;
1224     t->parms.link = p->link;
1225     t->parms.proto = p->proto;
1226     t->parms.i_key = p->i_key;
1227     t->parms.o_key = p->o_key;
1228     t->parms.i_flags = p->i_flags;
1229     t->parms.o_flags = p->o_flags;
1230     t->parms.fwmark = p->fwmark;
1231     t->parms.erspan_ver = p->erspan_ver;
1232     t->parms.index = p->index;
1233     t->parms.dir = p->dir;
1234     t->parms.hwid = p->hwid;
1235     dst_cache_reset(&t->dst_cache);
1236 }
1237 
1238 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1239                  int set_mtu)
1240 {
1241     ip6gre_tnl_copy_tnl_parm(t, p);
1242     ip6gre_tnl_link_config(t, set_mtu);
1243     return 0;
1244 }
1245 
1246 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1247     const struct ip6_tnl_parm2 *u)
1248 {
1249     p->laddr = u->laddr;
1250     p->raddr = u->raddr;
1251     p->flags = u->flags;
1252     p->hop_limit = u->hop_limit;
1253     p->encap_limit = u->encap_limit;
1254     p->flowinfo = u->flowinfo;
1255     p->link = u->link;
1256     p->i_key = u->i_key;
1257     p->o_key = u->o_key;
1258     p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1259     p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1260     memcpy(p->name, u->name, sizeof(u->name));
1261 }
1262 
1263 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1264     const struct __ip6_tnl_parm *p)
1265 {
1266     u->proto = IPPROTO_GRE;
1267     u->laddr = p->laddr;
1268     u->raddr = p->raddr;
1269     u->flags = p->flags;
1270     u->hop_limit = p->hop_limit;
1271     u->encap_limit = p->encap_limit;
1272     u->flowinfo = p->flowinfo;
1273     u->link = p->link;
1274     u->i_key = p->i_key;
1275     u->o_key = p->o_key;
1276     u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1277     u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1278     memcpy(u->name, p->name, sizeof(u->name));
1279 }
1280 
1281 static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1282                     struct ifreq *ifr, void __user *data,
1283                     int cmd)
1284 {
1285     int err = 0;
1286     struct ip6_tnl_parm2 p;
1287     struct __ip6_tnl_parm p1;
1288     struct ip6_tnl *t = netdev_priv(dev);
1289     struct net *net = t->net;
1290     struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1291 
1292     memset(&p1, 0, sizeof(p1));
1293 
1294     switch (cmd) {
1295     case SIOCGETTUNNEL:
1296         if (dev == ign->fb_tunnel_dev) {
1297             if (copy_from_user(&p, data, sizeof(p))) {
1298                 err = -EFAULT;
1299                 break;
1300             }
1301             ip6gre_tnl_parm_from_user(&p1, &p);
1302             t = ip6gre_tunnel_locate(net, &p1, 0);
1303             if (!t)
1304                 t = netdev_priv(dev);
1305         }
1306         memset(&p, 0, sizeof(p));
1307         ip6gre_tnl_parm_to_user(&p, &t->parms);
1308         if (copy_to_user(data, &p, sizeof(p)))
1309             err = -EFAULT;
1310         break;
1311 
1312     case SIOCADDTUNNEL:
1313     case SIOCCHGTUNNEL:
1314         err = -EPERM;
1315         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1316             goto done;
1317 
1318         err = -EFAULT;
1319         if (copy_from_user(&p, data, sizeof(p)))
1320             goto done;
1321 
1322         err = -EINVAL;
1323         if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1324             goto done;
1325 
1326         if (!(p.i_flags&GRE_KEY))
1327             p.i_key = 0;
1328         if (!(p.o_flags&GRE_KEY))
1329             p.o_key = 0;
1330 
1331         ip6gre_tnl_parm_from_user(&p1, &p);
1332         t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1333 
1334         if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1335             if (t) {
1336                 if (t->dev != dev) {
1337                     err = -EEXIST;
1338                     break;
1339                 }
1340             } else {
1341                 t = netdev_priv(dev);
1342 
1343                 ip6gre_tunnel_unlink(ign, t);
1344                 synchronize_net();
1345                 ip6gre_tnl_change(t, &p1, 1);
1346                 ip6gre_tunnel_link(ign, t);
1347                 netdev_state_change(dev);
1348             }
1349         }
1350 
1351         if (t) {
1352             err = 0;
1353 
1354             memset(&p, 0, sizeof(p));
1355             ip6gre_tnl_parm_to_user(&p, &t->parms);
1356             if (copy_to_user(data, &p, sizeof(p)))
1357                 err = -EFAULT;
1358         } else
1359             err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1360         break;
1361 
1362     case SIOCDELTUNNEL:
1363         err = -EPERM;
1364         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1365             goto done;
1366 
1367         if (dev == ign->fb_tunnel_dev) {
1368             err = -EFAULT;
1369             if (copy_from_user(&p, data, sizeof(p)))
1370                 goto done;
1371             err = -ENOENT;
1372             ip6gre_tnl_parm_from_user(&p1, &p);
1373             t = ip6gre_tunnel_locate(net, &p1, 0);
1374             if (!t)
1375                 goto done;
1376             err = -EPERM;
1377             if (t == netdev_priv(ign->fb_tunnel_dev))
1378                 goto done;
1379             dev = t->dev;
1380         }
1381         unregister_netdevice(dev);
1382         err = 0;
1383         break;
1384 
1385     default:
1386         err = -EINVAL;
1387     }
1388 
1389 done:
1390     return err;
1391 }
1392 
1393 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1394              unsigned short type, const void *daddr,
1395              const void *saddr, unsigned int len)
1396 {
1397     struct ip6_tnl *t = netdev_priv(dev);
1398     struct ipv6hdr *ipv6h;
1399     __be16 *p;
1400 
1401     ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1402     ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1403                           t->fl.u.ip6.flowlabel,
1404                           true, &t->fl.u.ip6));
1405     ipv6h->hop_limit = t->parms.hop_limit;
1406     ipv6h->nexthdr = NEXTHDR_GRE;
1407     ipv6h->saddr = t->parms.laddr;
1408     ipv6h->daddr = t->parms.raddr;
1409 
1410     p = (__be16 *)(ipv6h + 1);
1411     p[0] = t->parms.o_flags;
1412     p[1] = htons(type);
1413 
1414     /*
1415      *  Set the source hardware address.
1416      */
1417 
1418     if (saddr)
1419         memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1420     if (daddr)
1421         memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1422     if (!ipv6_addr_any(&ipv6h->daddr))
1423         return t->hlen;
1424 
1425     return -t->hlen;
1426 }
1427 
1428 static const struct header_ops ip6gre_header_ops = {
1429     .create = ip6gre_header,
1430 };
1431 
1432 static const struct net_device_ops ip6gre_netdev_ops = {
1433     .ndo_init       = ip6gre_tunnel_init,
1434     .ndo_uninit     = ip6gre_tunnel_uninit,
1435     .ndo_start_xmit     = ip6gre_tunnel_xmit,
1436     .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate,
1437     .ndo_change_mtu     = ip6_tnl_change_mtu,
1438     .ndo_get_stats64    = dev_get_tstats64,
1439     .ndo_get_iflink     = ip6_tnl_get_iflink,
1440 };
1441 
1442 static void ip6gre_dev_free(struct net_device *dev)
1443 {
1444     struct ip6_tnl *t = netdev_priv(dev);
1445 
1446     gro_cells_destroy(&t->gro_cells);
1447     dst_cache_destroy(&t->dst_cache);
1448     free_percpu(dev->tstats);
1449 }
1450 
1451 static void ip6gre_tunnel_setup(struct net_device *dev)
1452 {
1453     dev->netdev_ops = &ip6gre_netdev_ops;
1454     dev->needs_free_netdev = true;
1455     dev->priv_destructor = ip6gre_dev_free;
1456 
1457     dev->type = ARPHRD_IP6GRE;
1458 
1459     dev->flags |= IFF_NOARP;
1460     dev->addr_len = sizeof(struct in6_addr);
1461     netif_keep_dst(dev);
1462     /* This perm addr will be used as interface identifier by IPv6 */
1463     dev->addr_assign_type = NET_ADDR_RANDOM;
1464     eth_random_addr(dev->perm_addr);
1465 }
1466 
1467 #define GRE6_FEATURES (NETIF_F_SG |     \
1468                NETIF_F_FRAGLIST |   \
1469                NETIF_F_HIGHDMA |    \
1470                NETIF_F_HW_CSUM)
1471 
1472 static void ip6gre_tnl_init_features(struct net_device *dev)
1473 {
1474     struct ip6_tnl *nt = netdev_priv(dev);
1475     __be16 flags;
1476 
1477     dev->features       |= GRE6_FEATURES | NETIF_F_LLTX;
1478     dev->hw_features    |= GRE6_FEATURES;
1479 
1480     flags = nt->parms.o_flags;
1481 
1482     /* TCP offload with GRE SEQ is not supported, nor can we support 2
1483      * levels of outer headers requiring an update.
1484      */
1485     if (flags & TUNNEL_SEQ)
1486         return;
1487     if (flags & TUNNEL_CSUM && nt->encap.type != TUNNEL_ENCAP_NONE)
1488         return;
1489 
1490     dev->features |= NETIF_F_GSO_SOFTWARE;
1491     dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1492 }
1493 
1494 static int ip6gre_tunnel_init_common(struct net_device *dev)
1495 {
1496     struct ip6_tnl *tunnel;
1497     int ret;
1498     int t_hlen;
1499 
1500     tunnel = netdev_priv(dev);
1501 
1502     tunnel->dev = dev;
1503     tunnel->net = dev_net(dev);
1504     strcpy(tunnel->parms.name, dev->name);
1505 
1506     dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1507     if (!dev->tstats)
1508         return -ENOMEM;
1509 
1510     ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1511     if (ret)
1512         goto cleanup_alloc_pcpu_stats;
1513 
1514     ret = gro_cells_init(&tunnel->gro_cells, dev);
1515     if (ret)
1516         goto cleanup_dst_cache_init;
1517 
1518     t_hlen = ip6gre_calc_hlen(tunnel);
1519     dev->mtu = ETH_DATA_LEN - t_hlen;
1520     if (dev->type == ARPHRD_ETHER)
1521         dev->mtu -= ETH_HLEN;
1522     if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1523         dev->mtu -= 8;
1524 
1525     if (tunnel->parms.collect_md) {
1526         netif_keep_dst(dev);
1527     }
1528     ip6gre_tnl_init_features(dev);
1529 
1530     netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1531     return 0;
1532 
1533 cleanup_dst_cache_init:
1534     dst_cache_destroy(&tunnel->dst_cache);
1535 cleanup_alloc_pcpu_stats:
1536     free_percpu(dev->tstats);
1537     dev->tstats = NULL;
1538     return ret;
1539 }
1540 
1541 static int ip6gre_tunnel_init(struct net_device *dev)
1542 {
1543     struct ip6_tnl *tunnel;
1544     int ret;
1545 
1546     ret = ip6gre_tunnel_init_common(dev);
1547     if (ret)
1548         return ret;
1549 
1550     tunnel = netdev_priv(dev);
1551 
1552     if (tunnel->parms.collect_md)
1553         return 0;
1554 
1555     __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
1556     memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1557 
1558     if (ipv6_addr_any(&tunnel->parms.raddr))
1559         dev->header_ops = &ip6gre_header_ops;
1560 
1561     return 0;
1562 }
1563 
1564 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1565 {
1566     struct ip6_tnl *tunnel = netdev_priv(dev);
1567 
1568     tunnel->dev = dev;
1569     tunnel->net = dev_net(dev);
1570     strcpy(tunnel->parms.name, dev->name);
1571 
1572     tunnel->hlen        = sizeof(struct ipv6hdr) + 4;
1573 }
1574 
1575 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1576     .handler     = gre_rcv,
1577     .err_handler = ip6gre_err,
1578     .flags       = INET6_PROTO_FINAL,
1579 };
1580 
1581 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1582 {
1583     struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1584     struct net_device *dev, *aux;
1585     int prio;
1586 
1587     for_each_netdev_safe(net, dev, aux)
1588         if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1589             dev->rtnl_link_ops == &ip6gre_tap_ops ||
1590             dev->rtnl_link_ops == &ip6erspan_tap_ops)
1591             unregister_netdevice_queue(dev, head);
1592 
1593     for (prio = 0; prio < 4; prio++) {
1594         int h;
1595         for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1596             struct ip6_tnl *t;
1597 
1598             t = rtnl_dereference(ign->tunnels[prio][h]);
1599 
1600             while (t) {
1601                 /* If dev is in the same netns, it has already
1602                  * been added to the list by the previous loop.
1603                  */
1604                 if (!net_eq(dev_net(t->dev), net))
1605                     unregister_netdevice_queue(t->dev,
1606                                    head);
1607                 t = rtnl_dereference(t->next);
1608             }
1609         }
1610     }
1611 }
1612 
1613 static int __net_init ip6gre_init_net(struct net *net)
1614 {
1615     struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1616     struct net_device *ndev;
1617     int err;
1618 
1619     if (!net_has_fallback_tunnels(net))
1620         return 0;
1621     ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1622                 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1623     if (!ndev) {
1624         err = -ENOMEM;
1625         goto err_alloc_dev;
1626     }
1627     ign->fb_tunnel_dev = ndev;
1628     dev_net_set(ign->fb_tunnel_dev, net);
1629     /* FB netdevice is special: we have one, and only one per netns.
1630      * Allowing to move it to another netns is clearly unsafe.
1631      */
1632     ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1633 
1634 
1635     ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1636     ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1637 
1638     err = register_netdev(ign->fb_tunnel_dev);
1639     if (err)
1640         goto err_reg_dev;
1641 
1642     rcu_assign_pointer(ign->tunnels_wc[0],
1643                netdev_priv(ign->fb_tunnel_dev));
1644     return 0;
1645 
1646 err_reg_dev:
1647     free_netdev(ndev);
1648 err_alloc_dev:
1649     return err;
1650 }
1651 
1652 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1653 {
1654     struct net *net;
1655     LIST_HEAD(list);
1656 
1657     rtnl_lock();
1658     list_for_each_entry(net, net_list, exit_list)
1659         ip6gre_destroy_tunnels(net, &list);
1660     unregister_netdevice_many(&list);
1661     rtnl_unlock();
1662 }
1663 
1664 static struct pernet_operations ip6gre_net_ops = {
1665     .init = ip6gre_init_net,
1666     .exit_batch = ip6gre_exit_batch_net,
1667     .id   = &ip6gre_net_id,
1668     .size = sizeof(struct ip6gre_net),
1669 };
1670 
1671 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1672                   struct netlink_ext_ack *extack)
1673 {
1674     __be16 flags;
1675 
1676     if (!data)
1677         return 0;
1678 
1679     flags = 0;
1680     if (data[IFLA_GRE_IFLAGS])
1681         flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1682     if (data[IFLA_GRE_OFLAGS])
1683         flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1684     if (flags & (GRE_VERSION|GRE_ROUTING))
1685         return -EINVAL;
1686 
1687     return 0;
1688 }
1689 
1690 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1691                    struct netlink_ext_ack *extack)
1692 {
1693     struct in6_addr daddr;
1694 
1695     if (tb[IFLA_ADDRESS]) {
1696         if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1697             return -EINVAL;
1698         if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1699             return -EADDRNOTAVAIL;
1700     }
1701 
1702     if (!data)
1703         goto out;
1704 
1705     if (data[IFLA_GRE_REMOTE]) {
1706         daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1707         if (ipv6_addr_any(&daddr))
1708             return -EINVAL;
1709     }
1710 
1711 out:
1712     return ip6gre_tunnel_validate(tb, data, extack);
1713 }
1714 
1715 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1716                   struct netlink_ext_ack *extack)
1717 {
1718     __be16 flags = 0;
1719     int ret, ver = 0;
1720 
1721     if (!data)
1722         return 0;
1723 
1724     ret = ip6gre_tap_validate(tb, data, extack);
1725     if (ret)
1726         return ret;
1727 
1728     /* ERSPAN should only have GRE sequence and key flag */
1729     if (data[IFLA_GRE_OFLAGS])
1730         flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1731     if (data[IFLA_GRE_IFLAGS])
1732         flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1733     if (!data[IFLA_GRE_COLLECT_METADATA] &&
1734         flags != (GRE_SEQ | GRE_KEY))
1735         return -EINVAL;
1736 
1737     /* ERSPAN Session ID only has 10-bit. Since we reuse
1738      * 32-bit key field as ID, check it's range.
1739      */
1740     if (data[IFLA_GRE_IKEY] &&
1741         (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1742         return -EINVAL;
1743 
1744     if (data[IFLA_GRE_OKEY] &&
1745         (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1746         return -EINVAL;
1747 
1748     if (data[IFLA_GRE_ERSPAN_VER]) {
1749         ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1750         if (ver != 1 && ver != 2)
1751             return -EINVAL;
1752     }
1753 
1754     if (ver == 1) {
1755         if (data[IFLA_GRE_ERSPAN_INDEX]) {
1756             u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1757 
1758             if (index & ~INDEX_MASK)
1759                 return -EINVAL;
1760         }
1761     } else if (ver == 2) {
1762         if (data[IFLA_GRE_ERSPAN_DIR]) {
1763             u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1764 
1765             if (dir & ~(DIR_MASK >> DIR_OFFSET))
1766                 return -EINVAL;
1767         }
1768 
1769         if (data[IFLA_GRE_ERSPAN_HWID]) {
1770             u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1771 
1772             if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1773                 return -EINVAL;
1774         }
1775     }
1776 
1777     return 0;
1778 }
1779 
1780 static void ip6erspan_set_version(struct nlattr *data[],
1781                   struct __ip6_tnl_parm *parms)
1782 {
1783     if (!data)
1784         return;
1785 
1786     parms->erspan_ver = 1;
1787     if (data[IFLA_GRE_ERSPAN_VER])
1788         parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1789 
1790     if (parms->erspan_ver == 1) {
1791         if (data[IFLA_GRE_ERSPAN_INDEX])
1792             parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1793     } else if (parms->erspan_ver == 2) {
1794         if (data[IFLA_GRE_ERSPAN_DIR])
1795             parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1796         if (data[IFLA_GRE_ERSPAN_HWID])
1797             parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1798     }
1799 }
1800 
1801 static void ip6gre_netlink_parms(struct nlattr *data[],
1802                 struct __ip6_tnl_parm *parms)
1803 {
1804     memset(parms, 0, sizeof(*parms));
1805 
1806     if (!data)
1807         return;
1808 
1809     if (data[IFLA_GRE_LINK])
1810         parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1811 
1812     if (data[IFLA_GRE_IFLAGS])
1813         parms->i_flags = gre_flags_to_tnl_flags(
1814                 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1815 
1816     if (data[IFLA_GRE_OFLAGS])
1817         parms->o_flags = gre_flags_to_tnl_flags(
1818                 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1819 
1820     if (data[IFLA_GRE_IKEY])
1821         parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1822 
1823     if (data[IFLA_GRE_OKEY])
1824         parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1825 
1826     if (data[IFLA_GRE_LOCAL])
1827         parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1828 
1829     if (data[IFLA_GRE_REMOTE])
1830         parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1831 
1832     if (data[IFLA_GRE_TTL])
1833         parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1834 
1835     if (data[IFLA_GRE_ENCAP_LIMIT])
1836         parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1837 
1838     if (data[IFLA_GRE_FLOWINFO])
1839         parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1840 
1841     if (data[IFLA_GRE_FLAGS])
1842         parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1843 
1844     if (data[IFLA_GRE_FWMARK])
1845         parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1846 
1847     if (data[IFLA_GRE_COLLECT_METADATA])
1848         parms->collect_md = true;
1849 }
1850 
1851 static int ip6gre_tap_init(struct net_device *dev)
1852 {
1853     int ret;
1854 
1855     ret = ip6gre_tunnel_init_common(dev);
1856     if (ret)
1857         return ret;
1858 
1859     dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1860 
1861     return 0;
1862 }
1863 
1864 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1865     .ndo_init = ip6gre_tap_init,
1866     .ndo_uninit = ip6gre_tunnel_uninit,
1867     .ndo_start_xmit = ip6gre_tunnel_xmit,
1868     .ndo_set_mac_address = eth_mac_addr,
1869     .ndo_validate_addr = eth_validate_addr,
1870     .ndo_change_mtu = ip6_tnl_change_mtu,
1871     .ndo_get_stats64 = dev_get_tstats64,
1872     .ndo_get_iflink = ip6_tnl_get_iflink,
1873 };
1874 
1875 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1876 {
1877     int t_hlen;
1878 
1879     tunnel->tun_hlen = 8;
1880     tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1881                erspan_hdr_len(tunnel->parms.erspan_ver);
1882 
1883     t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1884     tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1885     return t_hlen;
1886 }
1887 
1888 static int ip6erspan_tap_init(struct net_device *dev)
1889 {
1890     struct ip6_tnl *tunnel;
1891     int t_hlen;
1892     int ret;
1893 
1894     tunnel = netdev_priv(dev);
1895 
1896     tunnel->dev = dev;
1897     tunnel->net = dev_net(dev);
1898     strcpy(tunnel->parms.name, dev->name);
1899 
1900     dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1901     if (!dev->tstats)
1902         return -ENOMEM;
1903 
1904     ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1905     if (ret)
1906         goto cleanup_alloc_pcpu_stats;
1907 
1908     ret = gro_cells_init(&tunnel->gro_cells, dev);
1909     if (ret)
1910         goto cleanup_dst_cache_init;
1911 
1912     t_hlen = ip6erspan_calc_hlen(tunnel);
1913     dev->mtu = ETH_DATA_LEN - t_hlen;
1914     if (dev->type == ARPHRD_ETHER)
1915         dev->mtu -= ETH_HLEN;
1916     if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1917         dev->mtu -= 8;
1918 
1919     dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1920     ip6erspan_tnl_link_config(tunnel, 1);
1921 
1922     netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1923     return 0;
1924 
1925 cleanup_dst_cache_init:
1926     dst_cache_destroy(&tunnel->dst_cache);
1927 cleanup_alloc_pcpu_stats:
1928     free_percpu(dev->tstats);
1929     dev->tstats = NULL;
1930     return ret;
1931 }
1932 
1933 static const struct net_device_ops ip6erspan_netdev_ops = {
1934     .ndo_init =     ip6erspan_tap_init,
1935     .ndo_uninit =       ip6erspan_tunnel_uninit,
1936     .ndo_start_xmit =   ip6erspan_tunnel_xmit,
1937     .ndo_set_mac_address =  eth_mac_addr,
1938     .ndo_validate_addr =    eth_validate_addr,
1939     .ndo_change_mtu =   ip6_tnl_change_mtu,
1940     .ndo_get_stats64 =  dev_get_tstats64,
1941     .ndo_get_iflink =   ip6_tnl_get_iflink,
1942 };
1943 
1944 static void ip6gre_tap_setup(struct net_device *dev)
1945 {
1946 
1947     ether_setup(dev);
1948 
1949     dev->max_mtu = 0;
1950     dev->netdev_ops = &ip6gre_tap_netdev_ops;
1951     dev->needs_free_netdev = true;
1952     dev->priv_destructor = ip6gre_dev_free;
1953 
1954     dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1955     dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1956     netif_keep_dst(dev);
1957 }
1958 
1959 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1960                        struct ip_tunnel_encap *ipencap)
1961 {
1962     bool ret = false;
1963 
1964     memset(ipencap, 0, sizeof(*ipencap));
1965 
1966     if (!data)
1967         return ret;
1968 
1969     if (data[IFLA_GRE_ENCAP_TYPE]) {
1970         ret = true;
1971         ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1972     }
1973 
1974     if (data[IFLA_GRE_ENCAP_FLAGS]) {
1975         ret = true;
1976         ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1977     }
1978 
1979     if (data[IFLA_GRE_ENCAP_SPORT]) {
1980         ret = true;
1981         ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1982     }
1983 
1984     if (data[IFLA_GRE_ENCAP_DPORT]) {
1985         ret = true;
1986         ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1987     }
1988 
1989     return ret;
1990 }
1991 
1992 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1993                  struct nlattr *tb[], struct nlattr *data[],
1994                  struct netlink_ext_ack *extack)
1995 {
1996     struct ip6_tnl *nt;
1997     struct ip_tunnel_encap ipencap;
1998     int err;
1999 
2000     nt = netdev_priv(dev);
2001 
2002     if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2003         int err = ip6_tnl_encap_setup(nt, &ipencap);
2004 
2005         if (err < 0)
2006             return err;
2007     }
2008 
2009     if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
2010         eth_hw_addr_random(dev);
2011 
2012     nt->dev = dev;
2013     nt->net = dev_net(dev);
2014 
2015     err = register_netdevice(dev);
2016     if (err)
2017         goto out;
2018 
2019     if (tb[IFLA_MTU])
2020         ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2021 
2022 out:
2023     return err;
2024 }
2025 
2026 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
2027               struct nlattr *tb[], struct nlattr *data[],
2028               struct netlink_ext_ack *extack)
2029 {
2030     struct ip6_tnl *nt = netdev_priv(dev);
2031     struct net *net = dev_net(dev);
2032     struct ip6gre_net *ign;
2033     int err;
2034 
2035     ip6gre_netlink_parms(data, &nt->parms);
2036     ign = net_generic(net, ip6gre_net_id);
2037 
2038     if (nt->parms.collect_md) {
2039         if (rtnl_dereference(ign->collect_md_tun))
2040             return -EEXIST;
2041     } else {
2042         if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2043             return -EEXIST;
2044     }
2045 
2046     err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2047     if (!err) {
2048         ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2049         ip6gre_tunnel_link_md(ign, nt);
2050         ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2051     }
2052     return err;
2053 }
2054 
2055 static struct ip6_tnl *
2056 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2057              struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2058              struct netlink_ext_ack *extack)
2059 {
2060     struct ip6_tnl *t, *nt = netdev_priv(dev);
2061     struct net *net = nt->net;
2062     struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2063     struct ip_tunnel_encap ipencap;
2064 
2065     if (dev == ign->fb_tunnel_dev)
2066         return ERR_PTR(-EINVAL);
2067 
2068     if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2069         int err = ip6_tnl_encap_setup(nt, &ipencap);
2070 
2071         if (err < 0)
2072             return ERR_PTR(err);
2073     }
2074 
2075     ip6gre_netlink_parms(data, p_p);
2076 
2077     t = ip6gre_tunnel_locate(net, p_p, 0);
2078 
2079     if (t) {
2080         if (t->dev != dev)
2081             return ERR_PTR(-EEXIST);
2082     } else {
2083         t = nt;
2084     }
2085 
2086     return t;
2087 }
2088 
2089 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2090                  struct nlattr *data[],
2091                  struct netlink_ext_ack *extack)
2092 {
2093     struct ip6_tnl *t = netdev_priv(dev);
2094     struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2095     struct __ip6_tnl_parm p;
2096 
2097     t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2098     if (IS_ERR(t))
2099         return PTR_ERR(t);
2100 
2101     ip6gre_tunnel_unlink_md(ign, t);
2102     ip6gre_tunnel_unlink(ign, t);
2103     ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2104     ip6gre_tunnel_link_md(ign, t);
2105     ip6gre_tunnel_link(ign, t);
2106     return 0;
2107 }
2108 
2109 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2110 {
2111     struct net *net = dev_net(dev);
2112     struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2113 
2114     if (dev != ign->fb_tunnel_dev)
2115         unregister_netdevice_queue(dev, head);
2116 }
2117 
2118 static size_t ip6gre_get_size(const struct net_device *dev)
2119 {
2120     return
2121         /* IFLA_GRE_LINK */
2122         nla_total_size(4) +
2123         /* IFLA_GRE_IFLAGS */
2124         nla_total_size(2) +
2125         /* IFLA_GRE_OFLAGS */
2126         nla_total_size(2) +
2127         /* IFLA_GRE_IKEY */
2128         nla_total_size(4) +
2129         /* IFLA_GRE_OKEY */
2130         nla_total_size(4) +
2131         /* IFLA_GRE_LOCAL */
2132         nla_total_size(sizeof(struct in6_addr)) +
2133         /* IFLA_GRE_REMOTE */
2134         nla_total_size(sizeof(struct in6_addr)) +
2135         /* IFLA_GRE_TTL */
2136         nla_total_size(1) +
2137         /* IFLA_GRE_ENCAP_LIMIT */
2138         nla_total_size(1) +
2139         /* IFLA_GRE_FLOWINFO */
2140         nla_total_size(4) +
2141         /* IFLA_GRE_FLAGS */
2142         nla_total_size(4) +
2143         /* IFLA_GRE_ENCAP_TYPE */
2144         nla_total_size(2) +
2145         /* IFLA_GRE_ENCAP_FLAGS */
2146         nla_total_size(2) +
2147         /* IFLA_GRE_ENCAP_SPORT */
2148         nla_total_size(2) +
2149         /* IFLA_GRE_ENCAP_DPORT */
2150         nla_total_size(2) +
2151         /* IFLA_GRE_COLLECT_METADATA */
2152         nla_total_size(0) +
2153         /* IFLA_GRE_FWMARK */
2154         nla_total_size(4) +
2155         /* IFLA_GRE_ERSPAN_INDEX */
2156         nla_total_size(4) +
2157         0;
2158 }
2159 
2160 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2161 {
2162     struct ip6_tnl *t = netdev_priv(dev);
2163     struct __ip6_tnl_parm *p = &t->parms;
2164     __be16 o_flags = p->o_flags;
2165 
2166     if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2167         if (!p->collect_md)
2168             o_flags |= TUNNEL_KEY;
2169 
2170         if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2171             goto nla_put_failure;
2172 
2173         if (p->erspan_ver == 1) {
2174             if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2175                 goto nla_put_failure;
2176         } else {
2177             if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2178                 goto nla_put_failure;
2179             if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2180                 goto nla_put_failure;
2181         }
2182     }
2183 
2184     if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2185         nla_put_be16(skb, IFLA_GRE_IFLAGS,
2186              gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2187         nla_put_be16(skb, IFLA_GRE_OFLAGS,
2188              gre_tnl_flags_to_gre_flags(o_flags)) ||
2189         nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2190         nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2191         nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2192         nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2193         nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2194         nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2195         nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2196         nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2197         nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2198         goto nla_put_failure;
2199 
2200     if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2201             t->encap.type) ||
2202         nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2203              t->encap.sport) ||
2204         nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2205              t->encap.dport) ||
2206         nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2207             t->encap.flags))
2208         goto nla_put_failure;
2209 
2210     if (p->collect_md) {
2211         if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2212             goto nla_put_failure;
2213     }
2214 
2215     return 0;
2216 
2217 nla_put_failure:
2218     return -EMSGSIZE;
2219 }
2220 
2221 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2222     [IFLA_GRE_LINK]        = { .type = NLA_U32 },
2223     [IFLA_GRE_IFLAGS]      = { .type = NLA_U16 },
2224     [IFLA_GRE_OFLAGS]      = { .type = NLA_U16 },
2225     [IFLA_GRE_IKEY]        = { .type = NLA_U32 },
2226     [IFLA_GRE_OKEY]        = { .type = NLA_U32 },
2227     [IFLA_GRE_LOCAL]       = { .len = sizeof_field(struct ipv6hdr, saddr) },
2228     [IFLA_GRE_REMOTE]      = { .len = sizeof_field(struct ipv6hdr, daddr) },
2229     [IFLA_GRE_TTL]         = { .type = NLA_U8 },
2230     [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2231     [IFLA_GRE_FLOWINFO]    = { .type = NLA_U32 },
2232     [IFLA_GRE_FLAGS]       = { .type = NLA_U32 },
2233     [IFLA_GRE_ENCAP_TYPE]   = { .type = NLA_U16 },
2234     [IFLA_GRE_ENCAP_FLAGS]  = { .type = NLA_U16 },
2235     [IFLA_GRE_ENCAP_SPORT]  = { .type = NLA_U16 },
2236     [IFLA_GRE_ENCAP_DPORT]  = { .type = NLA_U16 },
2237     [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2238     [IFLA_GRE_FWMARK]       = { .type = NLA_U32 },
2239     [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2240     [IFLA_GRE_ERSPAN_VER]   = { .type = NLA_U8 },
2241     [IFLA_GRE_ERSPAN_DIR]   = { .type = NLA_U8 },
2242     [IFLA_GRE_ERSPAN_HWID]  = { .type = NLA_U16 },
2243 };
2244 
2245 static void ip6erspan_tap_setup(struct net_device *dev)
2246 {
2247     ether_setup(dev);
2248 
2249     dev->max_mtu = 0;
2250     dev->netdev_ops = &ip6erspan_netdev_ops;
2251     dev->needs_free_netdev = true;
2252     dev->priv_destructor = ip6gre_dev_free;
2253 
2254     dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2255     dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2256     netif_keep_dst(dev);
2257 }
2258 
2259 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2260                  struct nlattr *tb[], struct nlattr *data[],
2261                  struct netlink_ext_ack *extack)
2262 {
2263     struct ip6_tnl *nt = netdev_priv(dev);
2264     struct net *net = dev_net(dev);
2265     struct ip6gre_net *ign;
2266     int err;
2267 
2268     ip6gre_netlink_parms(data, &nt->parms);
2269     ip6erspan_set_version(data, &nt->parms);
2270     ign = net_generic(net, ip6gre_net_id);
2271 
2272     if (nt->parms.collect_md) {
2273         if (rtnl_dereference(ign->collect_md_tun_erspan))
2274             return -EEXIST;
2275     } else {
2276         if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2277             return -EEXIST;
2278     }
2279 
2280     err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2281     if (!err) {
2282         ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2283         ip6erspan_tunnel_link_md(ign, nt);
2284         ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2285     }
2286     return err;
2287 }
2288 
2289 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2290 {
2291     ip6gre_tnl_link_config_common(t);
2292     ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2293 }
2294 
2295 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2296                 const struct __ip6_tnl_parm *p, int set_mtu)
2297 {
2298     ip6gre_tnl_copy_tnl_parm(t, p);
2299     ip6erspan_tnl_link_config(t, set_mtu);
2300     return 0;
2301 }
2302 
2303 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2304                 struct nlattr *data[],
2305                 struct netlink_ext_ack *extack)
2306 {
2307     struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2308     struct __ip6_tnl_parm p;
2309     struct ip6_tnl *t;
2310 
2311     t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2312     if (IS_ERR(t))
2313         return PTR_ERR(t);
2314 
2315     ip6erspan_set_version(data, &p);
2316     ip6gre_tunnel_unlink_md(ign, t);
2317     ip6gre_tunnel_unlink(ign, t);
2318     ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2319     ip6erspan_tunnel_link_md(ign, t);
2320     ip6gre_tunnel_link(ign, t);
2321     return 0;
2322 }
2323 
2324 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2325     .kind       = "ip6gre",
2326     .maxtype    = IFLA_GRE_MAX,
2327     .policy     = ip6gre_policy,
2328     .priv_size  = sizeof(struct ip6_tnl),
2329     .setup      = ip6gre_tunnel_setup,
2330     .validate   = ip6gre_tunnel_validate,
2331     .newlink    = ip6gre_newlink,
2332     .changelink = ip6gre_changelink,
2333     .dellink    = ip6gre_dellink,
2334     .get_size   = ip6gre_get_size,
2335     .fill_info  = ip6gre_fill_info,
2336     .get_link_net   = ip6_tnl_get_link_net,
2337 };
2338 
2339 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2340     .kind       = "ip6gretap",
2341     .maxtype    = IFLA_GRE_MAX,
2342     .policy     = ip6gre_policy,
2343     .priv_size  = sizeof(struct ip6_tnl),
2344     .setup      = ip6gre_tap_setup,
2345     .validate   = ip6gre_tap_validate,
2346     .newlink    = ip6gre_newlink,
2347     .changelink = ip6gre_changelink,
2348     .get_size   = ip6gre_get_size,
2349     .fill_info  = ip6gre_fill_info,
2350     .get_link_net   = ip6_tnl_get_link_net,
2351 };
2352 
2353 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2354     .kind       = "ip6erspan",
2355     .maxtype    = IFLA_GRE_MAX,
2356     .policy     = ip6gre_policy,
2357     .priv_size  = sizeof(struct ip6_tnl),
2358     .setup      = ip6erspan_tap_setup,
2359     .validate   = ip6erspan_tap_validate,
2360     .newlink    = ip6erspan_newlink,
2361     .changelink = ip6erspan_changelink,
2362     .get_size   = ip6gre_get_size,
2363     .fill_info  = ip6gre_fill_info,
2364     .get_link_net   = ip6_tnl_get_link_net,
2365 };
2366 
2367 /*
2368  *  And now the modules code and kernel interface.
2369  */
2370 
2371 static int __init ip6gre_init(void)
2372 {
2373     int err;
2374 
2375     pr_info("GRE over IPv6 tunneling driver\n");
2376 
2377     err = register_pernet_device(&ip6gre_net_ops);
2378     if (err < 0)
2379         return err;
2380 
2381     err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2382     if (err < 0) {
2383         pr_info("%s: can't add protocol\n", __func__);
2384         goto add_proto_failed;
2385     }
2386 
2387     err = rtnl_link_register(&ip6gre_link_ops);
2388     if (err < 0)
2389         goto rtnl_link_failed;
2390 
2391     err = rtnl_link_register(&ip6gre_tap_ops);
2392     if (err < 0)
2393         goto tap_ops_failed;
2394 
2395     err = rtnl_link_register(&ip6erspan_tap_ops);
2396     if (err < 0)
2397         goto erspan_link_failed;
2398 
2399 out:
2400     return err;
2401 
2402 erspan_link_failed:
2403     rtnl_link_unregister(&ip6gre_tap_ops);
2404 tap_ops_failed:
2405     rtnl_link_unregister(&ip6gre_link_ops);
2406 rtnl_link_failed:
2407     inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2408 add_proto_failed:
2409     unregister_pernet_device(&ip6gre_net_ops);
2410     goto out;
2411 }
2412 
2413 static void __exit ip6gre_fini(void)
2414 {
2415     rtnl_link_unregister(&ip6gre_tap_ops);
2416     rtnl_link_unregister(&ip6gre_link_ops);
2417     rtnl_link_unregister(&ip6erspan_tap_ops);
2418     inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2419     unregister_pernet_device(&ip6gre_net_ops);
2420 }
2421 
2422 module_init(ip6gre_init);
2423 module_exit(ip6gre_fini);
2424 MODULE_LICENSE("GPL");
2425 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2426 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2427 MODULE_ALIAS_RTNL_LINK("ip6gre");
2428 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2429 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2430 MODULE_ALIAS_NETDEV("ip6gre0");
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