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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (c) 2013 Nicira, Inc.
0004  */
0005 
0006 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0007 
0008 #include <linux/types.h>
0009 #include <linux/kernel.h>
0010 #include <linux/skbuff.h>
0011 #include <linux/netdevice.h>
0012 #include <linux/in.h>
0013 #include <linux/if_arp.h>
0014 #include <linux/init.h>
0015 #include <linux/in6.h>
0016 #include <linux/inetdevice.h>
0017 #include <linux/netfilter_ipv4.h>
0018 #include <linux/etherdevice.h>
0019 #include <linux/if_ether.h>
0020 #include <linux/if_vlan.h>
0021 #include <linux/static_key.h>
0022 
0023 #include <net/ip.h>
0024 #include <net/icmp.h>
0025 #include <net/protocol.h>
0026 #include <net/ip_tunnels.h>
0027 #include <net/ip6_tunnel.h>
0028 #include <net/ip6_checksum.h>
0029 #include <net/arp.h>
0030 #include <net/checksum.h>
0031 #include <net/dsfield.h>
0032 #include <net/inet_ecn.h>
0033 #include <net/xfrm.h>
0034 #include <net/net_namespace.h>
0035 #include <net/netns/generic.h>
0036 #include <net/rtnetlink.h>
0037 #include <net/dst_metadata.h>
0038 #include <net/geneve.h>
0039 #include <net/vxlan.h>
0040 #include <net/erspan.h>
0041 
0042 const struct ip_tunnel_encap_ops __rcu *
0043         iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
0044 EXPORT_SYMBOL(iptun_encaps);
0045 
0046 const struct ip6_tnl_encap_ops __rcu *
0047         ip6tun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
0048 EXPORT_SYMBOL(ip6tun_encaps);
0049 
0050 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
0051            __be32 src, __be32 dst, __u8 proto,
0052            __u8 tos, __u8 ttl, __be16 df, bool xnet)
0053 {
0054     int pkt_len = skb->len - skb_inner_network_offset(skb);
0055     struct net *net = dev_net(rt->dst.dev);
0056     struct net_device *dev = skb->dev;
0057     struct iphdr *iph;
0058     int err;
0059 
0060     skb_scrub_packet(skb, xnet);
0061 
0062     skb_clear_hash_if_not_l4(skb);
0063     skb_dst_set(skb, &rt->dst);
0064     memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
0065 
0066     /* Push down and install the IP header. */
0067     skb_push(skb, sizeof(struct iphdr));
0068     skb_reset_network_header(skb);
0069 
0070     iph = ip_hdr(skb);
0071 
0072     iph->version    =   4;
0073     iph->ihl    =   sizeof(struct iphdr) >> 2;
0074     iph->frag_off   =   ip_mtu_locked(&rt->dst) ? 0 : df;
0075     iph->protocol   =   proto;
0076     iph->tos    =   tos;
0077     iph->daddr  =   dst;
0078     iph->saddr  =   src;
0079     iph->ttl    =   ttl;
0080     __ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1);
0081 
0082     err = ip_local_out(net, sk, skb);
0083 
0084     if (dev) {
0085         if (unlikely(net_xmit_eval(err)))
0086             pkt_len = 0;
0087         iptunnel_xmit_stats(dev, pkt_len);
0088     }
0089 }
0090 EXPORT_SYMBOL_GPL(iptunnel_xmit);
0091 
0092 int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
0093                __be16 inner_proto, bool raw_proto, bool xnet)
0094 {
0095     if (unlikely(!pskb_may_pull(skb, hdr_len)))
0096         return -ENOMEM;
0097 
0098     skb_pull_rcsum(skb, hdr_len);
0099 
0100     if (!raw_proto && inner_proto == htons(ETH_P_TEB)) {
0101         struct ethhdr *eh;
0102 
0103         if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
0104             return -ENOMEM;
0105 
0106         eh = (struct ethhdr *)skb->data;
0107         if (likely(eth_proto_is_802_3(eh->h_proto)))
0108             skb->protocol = eh->h_proto;
0109         else
0110             skb->protocol = htons(ETH_P_802_2);
0111 
0112     } else {
0113         skb->protocol = inner_proto;
0114     }
0115 
0116     skb_clear_hash_if_not_l4(skb);
0117     __vlan_hwaccel_clear_tag(skb);
0118     skb_set_queue_mapping(skb, 0);
0119     skb_scrub_packet(skb, xnet);
0120 
0121     return iptunnel_pull_offloads(skb);
0122 }
0123 EXPORT_SYMBOL_GPL(__iptunnel_pull_header);
0124 
0125 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
0126                          gfp_t flags)
0127 {
0128     struct metadata_dst *res;
0129     struct ip_tunnel_info *dst, *src;
0130 
0131     if (!md || md->type != METADATA_IP_TUNNEL ||
0132         md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
0133         return NULL;
0134 
0135     src = &md->u.tun_info;
0136     res = metadata_dst_alloc(src->options_len, METADATA_IP_TUNNEL, flags);
0137     if (!res)
0138         return NULL;
0139 
0140     dst = &res->u.tun_info;
0141     dst->key.tun_id = src->key.tun_id;
0142     if (src->mode & IP_TUNNEL_INFO_IPV6)
0143         memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src,
0144                sizeof(struct in6_addr));
0145     else
0146         dst->key.u.ipv4.dst = src->key.u.ipv4.src;
0147     dst->key.tun_flags = src->key.tun_flags;
0148     dst->mode = src->mode | IP_TUNNEL_INFO_TX;
0149     ip_tunnel_info_opts_set(dst, ip_tunnel_info_opts(src),
0150                 src->options_len, 0);
0151 
0152     return res;
0153 }
0154 EXPORT_SYMBOL_GPL(iptunnel_metadata_reply);
0155 
0156 int iptunnel_handle_offloads(struct sk_buff *skb,
0157                  int gso_type_mask)
0158 {
0159     int err;
0160 
0161     if (likely(!skb->encapsulation)) {
0162         skb_reset_inner_headers(skb);
0163         skb->encapsulation = 1;
0164     }
0165 
0166     if (skb_is_gso(skb)) {
0167         err = skb_header_unclone(skb, GFP_ATOMIC);
0168         if (unlikely(err))
0169             return err;
0170         skb_shinfo(skb)->gso_type |= gso_type_mask;
0171         return 0;
0172     }
0173 
0174     if (skb->ip_summed != CHECKSUM_PARTIAL) {
0175         skb->ip_summed = CHECKSUM_NONE;
0176         /* We clear encapsulation here to prevent badly-written
0177          * drivers potentially deciding to offload an inner checksum
0178          * if we set CHECKSUM_PARTIAL on the outer header.
0179          * This should go away when the drivers are all fixed.
0180          */
0181         skb->encapsulation = 0;
0182     }
0183 
0184     return 0;
0185 }
0186 EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
0187 
0188 /**
0189  * iptunnel_pmtud_build_icmp() - Build ICMP error message for PMTUD
0190  * @skb:    Original packet with L2 header
0191  * @mtu:    MTU value for ICMP error
0192  *
0193  * Return: length on success, negative error code if message couldn't be built.
0194  */
0195 static int iptunnel_pmtud_build_icmp(struct sk_buff *skb, int mtu)
0196 {
0197     const struct iphdr *iph = ip_hdr(skb);
0198     struct icmphdr *icmph;
0199     struct iphdr *niph;
0200     struct ethhdr eh;
0201     int len, err;
0202 
0203     if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr)))
0204         return -EINVAL;
0205 
0206     skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN);
0207     pskb_pull(skb, ETH_HLEN);
0208     skb_reset_network_header(skb);
0209 
0210     err = pskb_trim(skb, 576 - sizeof(*niph) - sizeof(*icmph));
0211     if (err)
0212         return err;
0213 
0214     len = skb->len + sizeof(*icmph);
0215     err = skb_cow(skb, sizeof(*niph) + sizeof(*icmph) + ETH_HLEN);
0216     if (err)
0217         return err;
0218 
0219     icmph = skb_push(skb, sizeof(*icmph));
0220     *icmph = (struct icmphdr) {
0221         .type           = ICMP_DEST_UNREACH,
0222         .code           = ICMP_FRAG_NEEDED,
0223         .checksum       = 0,
0224         .un.frag.__unused   = 0,
0225         .un.frag.mtu        = htons(mtu),
0226     };
0227     icmph->checksum = ip_compute_csum(icmph, len);
0228     skb_reset_transport_header(skb);
0229 
0230     niph = skb_push(skb, sizeof(*niph));
0231     *niph = (struct iphdr) {
0232         .ihl            = sizeof(*niph) / 4u,
0233         .version        = 4,
0234         .tos            = 0,
0235         .tot_len        = htons(len + sizeof(*niph)),
0236         .id         = 0,
0237         .frag_off       = htons(IP_DF),
0238         .ttl            = iph->ttl,
0239         .protocol       = IPPROTO_ICMP,
0240         .saddr          = iph->daddr,
0241         .daddr          = iph->saddr,
0242     };
0243     ip_send_check(niph);
0244     skb_reset_network_header(skb);
0245 
0246     skb->ip_summed = CHECKSUM_NONE;
0247 
0248     eth_header(skb, skb->dev, ntohs(eh.h_proto), eh.h_source, eh.h_dest, 0);
0249     skb_reset_mac_header(skb);
0250 
0251     return skb->len;
0252 }
0253 
0254 /**
0255  * iptunnel_pmtud_check_icmp() - Trigger ICMP reply if needed and allowed
0256  * @skb:    Buffer being sent by encapsulation, L2 headers expected
0257  * @mtu:    Network MTU for path
0258  *
0259  * Return: 0 for no ICMP reply, length if built, negative value on error.
0260  */
0261 static int iptunnel_pmtud_check_icmp(struct sk_buff *skb, int mtu)
0262 {
0263     const struct icmphdr *icmph = icmp_hdr(skb);
0264     const struct iphdr *iph = ip_hdr(skb);
0265 
0266     if (mtu < 576 || iph->frag_off != htons(IP_DF))
0267         return 0;
0268 
0269     if (ipv4_is_lbcast(iph->daddr)  || ipv4_is_multicast(iph->daddr) ||
0270         ipv4_is_zeronet(iph->saddr) || ipv4_is_loopback(iph->saddr)  ||
0271         ipv4_is_lbcast(iph->saddr)  || ipv4_is_multicast(iph->saddr))
0272         return 0;
0273 
0274     if (iph->protocol == IPPROTO_ICMP && icmp_is_err(icmph->type))
0275         return 0;
0276 
0277     return iptunnel_pmtud_build_icmp(skb, mtu);
0278 }
0279 
0280 #if IS_ENABLED(CONFIG_IPV6)
0281 /**
0282  * iptunnel_pmtud_build_icmpv6() - Build ICMPv6 error message for PMTUD
0283  * @skb:    Original packet with L2 header
0284  * @mtu:    MTU value for ICMPv6 error
0285  *
0286  * Return: length on success, negative error code if message couldn't be built.
0287  */
0288 static int iptunnel_pmtud_build_icmpv6(struct sk_buff *skb, int mtu)
0289 {
0290     const struct ipv6hdr *ip6h = ipv6_hdr(skb);
0291     struct icmp6hdr *icmp6h;
0292     struct ipv6hdr *nip6h;
0293     struct ethhdr eh;
0294     int len, err;
0295     __wsum csum;
0296 
0297     if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr)))
0298         return -EINVAL;
0299 
0300     skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN);
0301     pskb_pull(skb, ETH_HLEN);
0302     skb_reset_network_header(skb);
0303 
0304     err = pskb_trim(skb, IPV6_MIN_MTU - sizeof(*nip6h) - sizeof(*icmp6h));
0305     if (err)
0306         return err;
0307 
0308     len = skb->len + sizeof(*icmp6h);
0309     err = skb_cow(skb, sizeof(*nip6h) + sizeof(*icmp6h) + ETH_HLEN);
0310     if (err)
0311         return err;
0312 
0313     icmp6h = skb_push(skb, sizeof(*icmp6h));
0314     *icmp6h = (struct icmp6hdr) {
0315         .icmp6_type     = ICMPV6_PKT_TOOBIG,
0316         .icmp6_code     = 0,
0317         .icmp6_cksum        = 0,
0318         .icmp6_mtu      = htonl(mtu),
0319     };
0320     skb_reset_transport_header(skb);
0321 
0322     nip6h = skb_push(skb, sizeof(*nip6h));
0323     *nip6h = (struct ipv6hdr) {
0324         .priority       = 0,
0325         .version        = 6,
0326         .flow_lbl       = { 0 },
0327         .payload_len        = htons(len),
0328         .nexthdr        = IPPROTO_ICMPV6,
0329         .hop_limit      = ip6h->hop_limit,
0330         .saddr          = ip6h->daddr,
0331         .daddr          = ip6h->saddr,
0332     };
0333     skb_reset_network_header(skb);
0334 
0335     csum = csum_partial(icmp6h, len, 0);
0336     icmp6h->icmp6_cksum = csum_ipv6_magic(&nip6h->saddr, &nip6h->daddr, len,
0337                           IPPROTO_ICMPV6, csum);
0338 
0339     skb->ip_summed = CHECKSUM_NONE;
0340 
0341     eth_header(skb, skb->dev, ntohs(eh.h_proto), eh.h_source, eh.h_dest, 0);
0342     skb_reset_mac_header(skb);
0343 
0344     return skb->len;
0345 }
0346 
0347 /**
0348  * iptunnel_pmtud_check_icmpv6() - Trigger ICMPv6 reply if needed and allowed
0349  * @skb:    Buffer being sent by encapsulation, L2 headers expected
0350  * @mtu:    Network MTU for path
0351  *
0352  * Return: 0 for no ICMPv6 reply, length if built, negative value on error.
0353  */
0354 static int iptunnel_pmtud_check_icmpv6(struct sk_buff *skb, int mtu)
0355 {
0356     const struct ipv6hdr *ip6h = ipv6_hdr(skb);
0357     int stype = ipv6_addr_type(&ip6h->saddr);
0358     u8 proto = ip6h->nexthdr;
0359     __be16 frag_off;
0360     int offset;
0361 
0362     if (mtu < IPV6_MIN_MTU)
0363         return 0;
0364 
0365     if (stype == IPV6_ADDR_ANY || stype == IPV6_ADDR_MULTICAST ||
0366         stype == IPV6_ADDR_LOOPBACK)
0367         return 0;
0368 
0369     offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &proto,
0370                   &frag_off);
0371     if (offset < 0 || (frag_off & htons(~0x7)))
0372         return 0;
0373 
0374     if (proto == IPPROTO_ICMPV6) {
0375         struct icmp6hdr *icmp6h;
0376 
0377         if (!pskb_may_pull(skb, skb_network_header(skb) +
0378                     offset + 1 - skb->data))
0379             return 0;
0380 
0381         icmp6h = (struct icmp6hdr *)(skb_network_header(skb) + offset);
0382         if (icmpv6_is_err(icmp6h->icmp6_type) ||
0383             icmp6h->icmp6_type == NDISC_REDIRECT)
0384             return 0;
0385     }
0386 
0387     return iptunnel_pmtud_build_icmpv6(skb, mtu);
0388 }
0389 #endif /* IS_ENABLED(CONFIG_IPV6) */
0390 
0391 /**
0392  * skb_tunnel_check_pmtu() - Check, update PMTU and trigger ICMP reply as needed
0393  * @skb:    Buffer being sent by encapsulation, L2 headers expected
0394  * @encap_dst:  Destination for tunnel encapsulation (outer IP)
0395  * @headroom:   Encapsulation header size, bytes
0396  * @reply:  Build matching ICMP or ICMPv6 message as a result
0397  *
0398  * L2 tunnel implementations that can carry IP and can be directly bridged
0399  * (currently UDP tunnels) can't always rely on IP forwarding paths to handle
0400  * PMTU discovery. In the bridged case, ICMP or ICMPv6 messages need to be built
0401  * based on payload and sent back by the encapsulation itself.
0402  *
0403  * For routable interfaces, we just need to update the PMTU for the destination.
0404  *
0405  * Return: 0 if ICMP error not needed, length if built, negative value on error
0406  */
0407 int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst,
0408               int headroom, bool reply)
0409 {
0410     u32 mtu = dst_mtu(encap_dst) - headroom;
0411 
0412     if ((skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) ||
0413         (!skb_is_gso(skb) && (skb->len - skb_network_offset(skb)) <= mtu))
0414         return 0;
0415 
0416     skb_dst_update_pmtu_no_confirm(skb, mtu);
0417 
0418     if (!reply || skb->pkt_type == PACKET_HOST)
0419         return 0;
0420 
0421     if (skb->protocol == htons(ETH_P_IP))
0422         return iptunnel_pmtud_check_icmp(skb, mtu);
0423 
0424 #if IS_ENABLED(CONFIG_IPV6)
0425     if (skb->protocol == htons(ETH_P_IPV6))
0426         return iptunnel_pmtud_check_icmpv6(skb, mtu);
0427 #endif
0428     return 0;
0429 }
0430 EXPORT_SYMBOL(skb_tunnel_check_pmtu);
0431 
0432 static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
0433     [LWTUNNEL_IP_UNSPEC]    = { .strict_start_type = LWTUNNEL_IP_OPTS },
0434     [LWTUNNEL_IP_ID]    = { .type = NLA_U64 },
0435     [LWTUNNEL_IP_DST]   = { .type = NLA_U32 },
0436     [LWTUNNEL_IP_SRC]   = { .type = NLA_U32 },
0437     [LWTUNNEL_IP_TTL]   = { .type = NLA_U8 },
0438     [LWTUNNEL_IP_TOS]   = { .type = NLA_U8 },
0439     [LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 },
0440     [LWTUNNEL_IP_OPTS]  = { .type = NLA_NESTED },
0441 };
0442 
0443 static const struct nla_policy ip_opts_policy[LWTUNNEL_IP_OPTS_MAX + 1] = {
0444     [LWTUNNEL_IP_OPTS_GENEVE]   = { .type = NLA_NESTED },
0445     [LWTUNNEL_IP_OPTS_VXLAN]    = { .type = NLA_NESTED },
0446     [LWTUNNEL_IP_OPTS_ERSPAN]   = { .type = NLA_NESTED },
0447 };
0448 
0449 static const struct nla_policy
0450 geneve_opt_policy[LWTUNNEL_IP_OPT_GENEVE_MAX + 1] = {
0451     [LWTUNNEL_IP_OPT_GENEVE_CLASS]  = { .type = NLA_U16 },
0452     [LWTUNNEL_IP_OPT_GENEVE_TYPE]   = { .type = NLA_U8 },
0453     [LWTUNNEL_IP_OPT_GENEVE_DATA]   = { .type = NLA_BINARY, .len = 128 },
0454 };
0455 
0456 static const struct nla_policy
0457 vxlan_opt_policy[LWTUNNEL_IP_OPT_VXLAN_MAX + 1] = {
0458     [LWTUNNEL_IP_OPT_VXLAN_GBP] = { .type = NLA_U32 },
0459 };
0460 
0461 static const struct nla_policy
0462 erspan_opt_policy[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1] = {
0463     [LWTUNNEL_IP_OPT_ERSPAN_VER]    = { .type = NLA_U8 },
0464     [LWTUNNEL_IP_OPT_ERSPAN_INDEX]  = { .type = NLA_U32 },
0465     [LWTUNNEL_IP_OPT_ERSPAN_DIR]    = { .type = NLA_U8 },
0466     [LWTUNNEL_IP_OPT_ERSPAN_HWID]   = { .type = NLA_U8 },
0467 };
0468 
0469 static int ip_tun_parse_opts_geneve(struct nlattr *attr,
0470                     struct ip_tunnel_info *info, int opts_len,
0471                     struct netlink_ext_ack *extack)
0472 {
0473     struct nlattr *tb[LWTUNNEL_IP_OPT_GENEVE_MAX + 1];
0474     int data_len, err;
0475 
0476     err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_GENEVE_MAX, attr,
0477                    geneve_opt_policy, extack);
0478     if (err)
0479         return err;
0480 
0481     if (!tb[LWTUNNEL_IP_OPT_GENEVE_CLASS] ||
0482         !tb[LWTUNNEL_IP_OPT_GENEVE_TYPE] ||
0483         !tb[LWTUNNEL_IP_OPT_GENEVE_DATA])
0484         return -EINVAL;
0485 
0486     attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA];
0487     data_len = nla_len(attr);
0488     if (data_len % 4)
0489         return -EINVAL;
0490 
0491     if (info) {
0492         struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len;
0493 
0494         memcpy(opt->opt_data, nla_data(attr), data_len);
0495         opt->length = data_len / 4;
0496         attr = tb[LWTUNNEL_IP_OPT_GENEVE_CLASS];
0497         opt->opt_class = nla_get_be16(attr);
0498         attr = tb[LWTUNNEL_IP_OPT_GENEVE_TYPE];
0499         opt->type = nla_get_u8(attr);
0500         info->key.tun_flags |= TUNNEL_GENEVE_OPT;
0501     }
0502 
0503     return sizeof(struct geneve_opt) + data_len;
0504 }
0505 
0506 static int ip_tun_parse_opts_vxlan(struct nlattr *attr,
0507                    struct ip_tunnel_info *info, int opts_len,
0508                    struct netlink_ext_ack *extack)
0509 {
0510     struct nlattr *tb[LWTUNNEL_IP_OPT_VXLAN_MAX + 1];
0511     int err;
0512 
0513     err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_VXLAN_MAX, attr,
0514                    vxlan_opt_policy, extack);
0515     if (err)
0516         return err;
0517 
0518     if (!tb[LWTUNNEL_IP_OPT_VXLAN_GBP])
0519         return -EINVAL;
0520 
0521     if (info) {
0522         struct vxlan_metadata *md =
0523             ip_tunnel_info_opts(info) + opts_len;
0524 
0525         attr = tb[LWTUNNEL_IP_OPT_VXLAN_GBP];
0526         md->gbp = nla_get_u32(attr);
0527         md->gbp &= VXLAN_GBP_MASK;
0528         info->key.tun_flags |= TUNNEL_VXLAN_OPT;
0529     }
0530 
0531     return sizeof(struct vxlan_metadata);
0532 }
0533 
0534 static int ip_tun_parse_opts_erspan(struct nlattr *attr,
0535                     struct ip_tunnel_info *info, int opts_len,
0536                     struct netlink_ext_ack *extack)
0537 {
0538     struct nlattr *tb[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1];
0539     int err;
0540     u8 ver;
0541 
0542     err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_ERSPAN_MAX, attr,
0543                    erspan_opt_policy, extack);
0544     if (err)
0545         return err;
0546 
0547     if (!tb[LWTUNNEL_IP_OPT_ERSPAN_VER])
0548         return -EINVAL;
0549 
0550     ver = nla_get_u8(tb[LWTUNNEL_IP_OPT_ERSPAN_VER]);
0551     if (ver == 1) {
0552         if (!tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX])
0553             return -EINVAL;
0554     } else if (ver == 2) {
0555         if (!tb[LWTUNNEL_IP_OPT_ERSPAN_DIR] ||
0556             !tb[LWTUNNEL_IP_OPT_ERSPAN_HWID])
0557             return -EINVAL;
0558     } else {
0559         return -EINVAL;
0560     }
0561 
0562     if (info) {
0563         struct erspan_metadata *md =
0564             ip_tunnel_info_opts(info) + opts_len;
0565 
0566         md->version = ver;
0567         if (ver == 1) {
0568             attr = tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX];
0569             md->u.index = nla_get_be32(attr);
0570         } else {
0571             attr = tb[LWTUNNEL_IP_OPT_ERSPAN_DIR];
0572             md->u.md2.dir = nla_get_u8(attr);
0573             attr = tb[LWTUNNEL_IP_OPT_ERSPAN_HWID];
0574             set_hwid(&md->u.md2, nla_get_u8(attr));
0575         }
0576 
0577         info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
0578     }
0579 
0580     return sizeof(struct erspan_metadata);
0581 }
0582 
0583 static int ip_tun_parse_opts(struct nlattr *attr, struct ip_tunnel_info *info,
0584                  struct netlink_ext_ack *extack)
0585 {
0586     int err, rem, opt_len, opts_len = 0;
0587     struct nlattr *nla;
0588     __be16 type = 0;
0589 
0590     if (!attr)
0591         return 0;
0592 
0593     err = nla_validate(nla_data(attr), nla_len(attr), LWTUNNEL_IP_OPTS_MAX,
0594                ip_opts_policy, extack);
0595     if (err)
0596         return err;
0597 
0598     nla_for_each_attr(nla, nla_data(attr), nla_len(attr), rem) {
0599         switch (nla_type(nla)) {
0600         case LWTUNNEL_IP_OPTS_GENEVE:
0601             if (type && type != TUNNEL_GENEVE_OPT)
0602                 return -EINVAL;
0603             opt_len = ip_tun_parse_opts_geneve(nla, info, opts_len,
0604                                extack);
0605             if (opt_len < 0)
0606                 return opt_len;
0607             opts_len += opt_len;
0608             if (opts_len > IP_TUNNEL_OPTS_MAX)
0609                 return -EINVAL;
0610             type = TUNNEL_GENEVE_OPT;
0611             break;
0612         case LWTUNNEL_IP_OPTS_VXLAN:
0613             if (type)
0614                 return -EINVAL;
0615             opt_len = ip_tun_parse_opts_vxlan(nla, info, opts_len,
0616                               extack);
0617             if (opt_len < 0)
0618                 return opt_len;
0619             opts_len += opt_len;
0620             type = TUNNEL_VXLAN_OPT;
0621             break;
0622         case LWTUNNEL_IP_OPTS_ERSPAN:
0623             if (type)
0624                 return -EINVAL;
0625             opt_len = ip_tun_parse_opts_erspan(nla, info, opts_len,
0626                                extack);
0627             if (opt_len < 0)
0628                 return opt_len;
0629             opts_len += opt_len;
0630             type = TUNNEL_ERSPAN_OPT;
0631             break;
0632         default:
0633             return -EINVAL;
0634         }
0635     }
0636 
0637     return opts_len;
0638 }
0639 
0640 static int ip_tun_get_optlen(struct nlattr *attr,
0641                  struct netlink_ext_ack *extack)
0642 {
0643     return ip_tun_parse_opts(attr, NULL, extack);
0644 }
0645 
0646 static int ip_tun_set_opts(struct nlattr *attr, struct ip_tunnel_info *info,
0647                struct netlink_ext_ack *extack)
0648 {
0649     return ip_tun_parse_opts(attr, info, extack);
0650 }
0651 
0652 static int ip_tun_build_state(struct net *net, struct nlattr *attr,
0653                   unsigned int family, const void *cfg,
0654                   struct lwtunnel_state **ts,
0655                   struct netlink_ext_ack *extack)
0656 {
0657     struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
0658     struct lwtunnel_state *new_state;
0659     struct ip_tunnel_info *tun_info;
0660     int err, opt_len;
0661 
0662     err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_MAX, attr,
0663                       ip_tun_policy, extack);
0664     if (err < 0)
0665         return err;
0666 
0667     opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP_OPTS], extack);
0668     if (opt_len < 0)
0669         return opt_len;
0670 
0671     new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
0672     if (!new_state)
0673         return -ENOMEM;
0674 
0675     new_state->type = LWTUNNEL_ENCAP_IP;
0676 
0677     tun_info = lwt_tun_info(new_state);
0678 
0679     err = ip_tun_set_opts(tb[LWTUNNEL_IP_OPTS], tun_info, extack);
0680     if (err < 0) {
0681         lwtstate_free(new_state);
0682         return err;
0683     }
0684 
0685 #ifdef CONFIG_DST_CACHE
0686     err = dst_cache_init(&tun_info->dst_cache, GFP_KERNEL);
0687     if (err) {
0688         lwtstate_free(new_state);
0689         return err;
0690     }
0691 #endif
0692 
0693     if (tb[LWTUNNEL_IP_ID])
0694         tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]);
0695 
0696     if (tb[LWTUNNEL_IP_DST])
0697         tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]);
0698 
0699     if (tb[LWTUNNEL_IP_SRC])
0700         tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]);
0701 
0702     if (tb[LWTUNNEL_IP_TTL])
0703         tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]);
0704 
0705     if (tb[LWTUNNEL_IP_TOS])
0706         tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);
0707 
0708     if (tb[LWTUNNEL_IP_FLAGS])
0709         tun_info->key.tun_flags |=
0710                 (nla_get_be16(tb[LWTUNNEL_IP_FLAGS]) &
0711                  ~TUNNEL_OPTIONS_PRESENT);
0712 
0713     tun_info->mode = IP_TUNNEL_INFO_TX;
0714     tun_info->options_len = opt_len;
0715 
0716     *ts = new_state;
0717 
0718     return 0;
0719 }
0720 
0721 static void ip_tun_destroy_state(struct lwtunnel_state *lwtstate)
0722 {
0723 #ifdef CONFIG_DST_CACHE
0724     struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
0725 
0726     dst_cache_destroy(&tun_info->dst_cache);
0727 #endif
0728 }
0729 
0730 static int ip_tun_fill_encap_opts_geneve(struct sk_buff *skb,
0731                      struct ip_tunnel_info *tun_info)
0732 {
0733     struct geneve_opt *opt;
0734     struct nlattr *nest;
0735     int offset = 0;
0736 
0737     nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_GENEVE);
0738     if (!nest)
0739         return -ENOMEM;
0740 
0741     while (tun_info->options_len > offset) {
0742         opt = ip_tunnel_info_opts(tun_info) + offset;
0743         if (nla_put_be16(skb, LWTUNNEL_IP_OPT_GENEVE_CLASS,
0744                  opt->opt_class) ||
0745             nla_put_u8(skb, LWTUNNEL_IP_OPT_GENEVE_TYPE, opt->type) ||
0746             nla_put(skb, LWTUNNEL_IP_OPT_GENEVE_DATA, opt->length * 4,
0747                 opt->opt_data)) {
0748             nla_nest_cancel(skb, nest);
0749             return -ENOMEM;
0750         }
0751         offset += sizeof(*opt) + opt->length * 4;
0752     }
0753 
0754     nla_nest_end(skb, nest);
0755     return 0;
0756 }
0757 
0758 static int ip_tun_fill_encap_opts_vxlan(struct sk_buff *skb,
0759                     struct ip_tunnel_info *tun_info)
0760 {
0761     struct vxlan_metadata *md;
0762     struct nlattr *nest;
0763 
0764     nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_VXLAN);
0765     if (!nest)
0766         return -ENOMEM;
0767 
0768     md = ip_tunnel_info_opts(tun_info);
0769     if (nla_put_u32(skb, LWTUNNEL_IP_OPT_VXLAN_GBP, md->gbp)) {
0770         nla_nest_cancel(skb, nest);
0771         return -ENOMEM;
0772     }
0773 
0774     nla_nest_end(skb, nest);
0775     return 0;
0776 }
0777 
0778 static int ip_tun_fill_encap_opts_erspan(struct sk_buff *skb,
0779                      struct ip_tunnel_info *tun_info)
0780 {
0781     struct erspan_metadata *md;
0782     struct nlattr *nest;
0783 
0784     nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_ERSPAN);
0785     if (!nest)
0786         return -ENOMEM;
0787 
0788     md = ip_tunnel_info_opts(tun_info);
0789     if (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_VER, md->version))
0790         goto err;
0791 
0792     if (md->version == 1 &&
0793         nla_put_be32(skb, LWTUNNEL_IP_OPT_ERSPAN_INDEX, md->u.index))
0794         goto err;
0795 
0796     if (md->version == 2 &&
0797         (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_DIR, md->u.md2.dir) ||
0798          nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_HWID,
0799             get_hwid(&md->u.md2))))
0800         goto err;
0801 
0802     nla_nest_end(skb, nest);
0803     return 0;
0804 err:
0805     nla_nest_cancel(skb, nest);
0806     return -ENOMEM;
0807 }
0808 
0809 static int ip_tun_fill_encap_opts(struct sk_buff *skb, int type,
0810                   struct ip_tunnel_info *tun_info)
0811 {
0812     struct nlattr *nest;
0813     int err = 0;
0814 
0815     if (!(tun_info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))
0816         return 0;
0817 
0818     nest = nla_nest_start_noflag(skb, type);
0819     if (!nest)
0820         return -ENOMEM;
0821 
0822     if (tun_info->key.tun_flags & TUNNEL_GENEVE_OPT)
0823         err = ip_tun_fill_encap_opts_geneve(skb, tun_info);
0824     else if (tun_info->key.tun_flags & TUNNEL_VXLAN_OPT)
0825         err = ip_tun_fill_encap_opts_vxlan(skb, tun_info);
0826     else if (tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)
0827         err = ip_tun_fill_encap_opts_erspan(skb, tun_info);
0828 
0829     if (err) {
0830         nla_nest_cancel(skb, nest);
0831         return err;
0832     }
0833 
0834     nla_nest_end(skb, nest);
0835     return 0;
0836 }
0837 
0838 static int ip_tun_fill_encap_info(struct sk_buff *skb,
0839                   struct lwtunnel_state *lwtstate)
0840 {
0841     struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
0842 
0843     if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id,
0844              LWTUNNEL_IP_PAD) ||
0845         nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) ||
0846         nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) ||
0847         nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) ||
0848         nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) ||
0849         nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags) ||
0850         ip_tun_fill_encap_opts(skb, LWTUNNEL_IP_OPTS, tun_info))
0851         return -ENOMEM;
0852 
0853     return 0;
0854 }
0855 
0856 static int ip_tun_opts_nlsize(struct ip_tunnel_info *info)
0857 {
0858     int opt_len;
0859 
0860     if (!(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))
0861         return 0;
0862 
0863     opt_len = nla_total_size(0);        /* LWTUNNEL_IP_OPTS */
0864     if (info->key.tun_flags & TUNNEL_GENEVE_OPT) {
0865         struct geneve_opt *opt;
0866         int offset = 0;
0867 
0868         opt_len += nla_total_size(0);   /* LWTUNNEL_IP_OPTS_GENEVE */
0869         while (info->options_len > offset) {
0870             opt = ip_tunnel_info_opts(info) + offset;
0871             opt_len += nla_total_size(2)    /* OPT_GENEVE_CLASS */
0872                    + nla_total_size(1)  /* OPT_GENEVE_TYPE */
0873                    + nla_total_size(opt->length * 4);
0874                             /* OPT_GENEVE_DATA */
0875             offset += sizeof(*opt) + opt->length * 4;
0876         }
0877     } else if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
0878         opt_len += nla_total_size(0)    /* LWTUNNEL_IP_OPTS_VXLAN */
0879                + nla_total_size(4); /* OPT_VXLAN_GBP */
0880     } else if (info->key.tun_flags & TUNNEL_ERSPAN_OPT) {
0881         struct erspan_metadata *md = ip_tunnel_info_opts(info);
0882 
0883         opt_len += nla_total_size(0)    /* LWTUNNEL_IP_OPTS_ERSPAN */
0884                + nla_total_size(1)  /* OPT_ERSPAN_VER */
0885                + (md->version == 1 ? nla_total_size(4)
0886                         /* OPT_ERSPAN_INDEX (v1) */
0887                            : nla_total_size(1) +
0888                          nla_total_size(1));
0889                         /* OPT_ERSPAN_DIR + HWID (v2) */
0890     }
0891 
0892     return opt_len;
0893 }
0894 
0895 static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
0896 {
0897     return nla_total_size_64bit(8)  /* LWTUNNEL_IP_ID */
0898         + nla_total_size(4) /* LWTUNNEL_IP_DST */
0899         + nla_total_size(4) /* LWTUNNEL_IP_SRC */
0900         + nla_total_size(1) /* LWTUNNEL_IP_TOS */
0901         + nla_total_size(1) /* LWTUNNEL_IP_TTL */
0902         + nla_total_size(2) /* LWTUNNEL_IP_FLAGS */
0903         + ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
0904                     /* LWTUNNEL_IP_OPTS */
0905 }
0906 
0907 static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
0908 {
0909     struct ip_tunnel_info *info_a = lwt_tun_info(a);
0910     struct ip_tunnel_info *info_b = lwt_tun_info(b);
0911 
0912     return memcmp(info_a, info_b, sizeof(info_a->key)) ||
0913            info_a->mode != info_b->mode ||
0914            info_a->options_len != info_b->options_len ||
0915            memcmp(ip_tunnel_info_opts(info_a),
0916               ip_tunnel_info_opts(info_b), info_a->options_len);
0917 }
0918 
0919 static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
0920     .build_state = ip_tun_build_state,
0921     .destroy_state = ip_tun_destroy_state,
0922     .fill_encap = ip_tun_fill_encap_info,
0923     .get_encap_size = ip_tun_encap_nlsize,
0924     .cmp_encap = ip_tun_cmp_encap,
0925     .owner = THIS_MODULE,
0926 };
0927 
0928 static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
0929     [LWTUNNEL_IP6_UNSPEC]   = { .strict_start_type = LWTUNNEL_IP6_OPTS },
0930     [LWTUNNEL_IP6_ID]       = { .type = NLA_U64 },
0931     [LWTUNNEL_IP6_DST]      = { .len = sizeof(struct in6_addr) },
0932     [LWTUNNEL_IP6_SRC]      = { .len = sizeof(struct in6_addr) },
0933     [LWTUNNEL_IP6_HOPLIMIT]     = { .type = NLA_U8 },
0934     [LWTUNNEL_IP6_TC]       = { .type = NLA_U8 },
0935     [LWTUNNEL_IP6_FLAGS]        = { .type = NLA_U16 },
0936     [LWTUNNEL_IP6_OPTS]     = { .type = NLA_NESTED },
0937 };
0938 
0939 static int ip6_tun_build_state(struct net *net, struct nlattr *attr,
0940                    unsigned int family, const void *cfg,
0941                    struct lwtunnel_state **ts,
0942                    struct netlink_ext_ack *extack)
0943 {
0944     struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
0945     struct lwtunnel_state *new_state;
0946     struct ip_tunnel_info *tun_info;
0947     int err, opt_len;
0948 
0949     err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP6_MAX, attr,
0950                       ip6_tun_policy, extack);
0951     if (err < 0)
0952         return err;
0953 
0954     opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP6_OPTS], extack);
0955     if (opt_len < 0)
0956         return opt_len;
0957 
0958     new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
0959     if (!new_state)
0960         return -ENOMEM;
0961 
0962     new_state->type = LWTUNNEL_ENCAP_IP6;
0963 
0964     tun_info = lwt_tun_info(new_state);
0965 
0966     err = ip_tun_set_opts(tb[LWTUNNEL_IP6_OPTS], tun_info, extack);
0967     if (err < 0) {
0968         lwtstate_free(new_state);
0969         return err;
0970     }
0971 
0972     if (tb[LWTUNNEL_IP6_ID])
0973         tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]);
0974 
0975     if (tb[LWTUNNEL_IP6_DST])
0976         tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]);
0977 
0978     if (tb[LWTUNNEL_IP6_SRC])
0979         tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]);
0980 
0981     if (tb[LWTUNNEL_IP6_HOPLIMIT])
0982         tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]);
0983 
0984     if (tb[LWTUNNEL_IP6_TC])
0985         tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);
0986 
0987     if (tb[LWTUNNEL_IP6_FLAGS])
0988         tun_info->key.tun_flags |=
0989                 (nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]) &
0990                  ~TUNNEL_OPTIONS_PRESENT);
0991 
0992     tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6;
0993     tun_info->options_len = opt_len;
0994 
0995     *ts = new_state;
0996 
0997     return 0;
0998 }
0999 
1000 static int ip6_tun_fill_encap_info(struct sk_buff *skb,
1001                    struct lwtunnel_state *lwtstate)
1002 {
1003     struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
1004 
1005     if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id,
1006              LWTUNNEL_IP6_PAD) ||
1007         nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) ||
1008         nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) ||
1009         nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) ||
1010         nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) ||
1011         nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags) ||
1012         ip_tun_fill_encap_opts(skb, LWTUNNEL_IP6_OPTS, tun_info))
1013         return -ENOMEM;
1014 
1015     return 0;
1016 }
1017 
1018 static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
1019 {
1020     return nla_total_size_64bit(8)  /* LWTUNNEL_IP6_ID */
1021         + nla_total_size(16)    /* LWTUNNEL_IP6_DST */
1022         + nla_total_size(16)    /* LWTUNNEL_IP6_SRC */
1023         + nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */
1024         + nla_total_size(1) /* LWTUNNEL_IP6_TC */
1025         + nla_total_size(2) /* LWTUNNEL_IP6_FLAGS */
1026         + ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
1027                     /* LWTUNNEL_IP6_OPTS */
1028 }
1029 
1030 static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
1031     .build_state = ip6_tun_build_state,
1032     .fill_encap = ip6_tun_fill_encap_info,
1033     .get_encap_size = ip6_tun_encap_nlsize,
1034     .cmp_encap = ip_tun_cmp_encap,
1035     .owner = THIS_MODULE,
1036 };
1037 
1038 void __init ip_tunnel_core_init(void)
1039 {
1040     /* If you land here, make sure whether increasing ip_tunnel_info's
1041      * options_len is a reasonable choice with its usage in front ends
1042      * (f.e., it's part of flow keys, etc).
1043      */
1044     BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255);
1045 
1046     lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
1047     lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
1048 }
1049 
1050 DEFINE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt);
1051 EXPORT_SYMBOL(ip_tunnel_metadata_cnt);
1052 
1053 void ip_tunnel_need_metadata(void)
1054 {
1055     static_branch_inc(&ip_tunnel_metadata_cnt);
1056 }
1057 EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);
1058 
1059 void ip_tunnel_unneed_metadata(void)
1060 {
1061     static_branch_dec(&ip_tunnel_metadata_cnt);
1062 }
1063 EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);
1064 
1065 /* Returns either the correct skb->protocol value, or 0 if invalid. */
1066 __be16 ip_tunnel_parse_protocol(const struct sk_buff *skb)
1067 {
1068     if (skb_network_header(skb) >= skb->head &&
1069         (skb_network_header(skb) + sizeof(struct iphdr)) <= skb_tail_pointer(skb) &&
1070         ip_hdr(skb)->version == 4)
1071         return htons(ETH_P_IP);
1072     if (skb_network_header(skb) >= skb->head &&
1073         (skb_network_header(skb) + sizeof(struct ipv6hdr)) <= skb_tail_pointer(skb) &&
1074         ipv6_hdr(skb)->version == 6)
1075         return htons(ETH_P_IPV6);
1076     return 0;
1077 }
1078 EXPORT_SYMBOL(ip_tunnel_parse_protocol);
1079 
1080 const struct header_ops ip_tunnel_header_ops = { .parse_protocol = ip_tunnel_parse_protocol };
1081 EXPORT_SYMBOL(ip_tunnel_header_ops);
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