Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2013 Nicira, Inc.
 */
 
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/in.h>
#include <linux/if_arp.h>
#include <linux/init.h>
#include <linux/in6.h>
#include <linux/inetdevice.h>
#include <linux/netfilter_ipv4.h>
#include <linux/etherdevice.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/static_key.h>
 
#include <net/ip.h>
#include <net/icmp.h>
#include <net/protocol.h>
#include <net/ip_tunnels.h>
#include <net/ip6_tunnel.h>
#include <net/ip6_checksum.h>
#include <net/arp.h>
#include <net/checksum.h>
#include <net/dsfield.h>
#include <net/inet_ecn.h>
#include <net/xfrm.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/rtnetlink.h>
#include <net/dst_metadata.h>
#include <net/geneve.h>
#include <net/vxlan.h>
#include <net/erspan.h>
 
const struct ip_tunnel_encap_ops __rcu *
<------><------>iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
EXPORT_SYMBOL(iptun_encaps);
 
const struct ip6_tnl_encap_ops __rcu *
<------><------>ip6tun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
EXPORT_SYMBOL(ip6tun_encaps);
 
void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
<------><------>   __be32 src, __be32 dst, __u8 proto,
<------><------>   __u8 tos, __u8 ttl, __be16 df, bool xnet)
{
<------>int pkt_len = skb->len - skb_inner_network_offset(skb);
<------>struct net *net = dev_net(rt->dst.dev);
<------>struct net_device *dev = skb->dev;
<------>struct iphdr *iph;
<------>int err;
 
<------>skb_scrub_packet(skb, xnet);
 
<------>skb_clear_hash_if_not_l4(skb);
<------>skb_dst_set(skb, &rt->dst);
<------>memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
 
<------>/* Push down and install the IP header. */
<------>skb_push(skb, sizeof(struct iphdr));
<------>skb_reset_network_header(skb);
 
<------>iph = ip_hdr(skb);
 
<------>iph->version	=	4;
<------>iph->ihl	=	sizeof(struct iphdr) >> 2;
<------>iph->frag_off	=	ip_mtu_locked(&rt->dst) ? 0 : df;
<------>iph->protocol	=	proto;
<------>iph->tos	=	tos;
<------>iph->daddr	=	dst;
<------>iph->saddr	=	src;
<------>iph->ttl	=	ttl;
<------>__ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1);
 
<------>err = ip_local_out(net, sk, skb);
 
<------>if (dev) {
<------><------>if (unlikely(net_xmit_eval(err)))
<------><------><------>pkt_len = 0;
<------><------>iptunnel_xmit_stats(dev, pkt_len);
<------>}
}
EXPORT_SYMBOL_GPL(iptunnel_xmit);
 
int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
<------><------><------>   __be16 inner_proto, bool raw_proto, bool xnet)
{
<------>if (unlikely(!pskb_may_pull(skb, hdr_len)))
<------><------>return -ENOMEM;
 
<------>skb_pull_rcsum(skb, hdr_len);
 
<------>if (!raw_proto && inner_proto == htons(ETH_P_TEB)) {
<------><------>struct ethhdr *eh;
 
<------><------>if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
<------><------><------>return -ENOMEM;
 
<------><------>eh = (struct ethhdr *)skb->data;
<------><------>if (likely(eth_proto_is_802_3(eh->h_proto)))
<------><------><------>skb->protocol = eh->h_proto;
<------><------>else
<------><------><------>skb->protocol = htons(ETH_P_802_2);
 
<------>} else {
<------><------>skb->protocol = inner_proto;
<------>}
 
<------>skb_clear_hash_if_not_l4(skb);
<------>__vlan_hwaccel_clear_tag(skb);
<------>skb_set_queue_mapping(skb, 0);
<------>skb_scrub_packet(skb, xnet);
 
<------>return iptunnel_pull_offloads(skb);
}
EXPORT_SYMBOL_GPL(__iptunnel_pull_header);
 
struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
<------><------><------><------><------>     gfp_t flags)
{
<------>struct metadata_dst *res;
<------>struct ip_tunnel_info *dst, *src;
 
<------>if (!md || md->type != METADATA_IP_TUNNEL ||
<------>    md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
<------><------>return NULL;
 
<------>src = &md->u.tun_info;
<------>res = metadata_dst_alloc(src->options_len, METADATA_IP_TUNNEL, flags);
<------>if (!res)
<------><------>return NULL;
 
<------>dst = &res->u.tun_info;
<------>dst->key.tun_id = src->key.tun_id;
<------>if (src->mode & IP_TUNNEL_INFO_IPV6)
<------><------>memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src,
<------><------>       sizeof(struct in6_addr));
<------>else
<------><------>dst->key.u.ipv4.dst = src->key.u.ipv4.src;
<------>dst->key.tun_flags = src->key.tun_flags;
<------>dst->mode = src->mode | IP_TUNNEL_INFO_TX;
<------>ip_tunnel_info_opts_set(dst, ip_tunnel_info_opts(src),
<------><------><------><------>src->options_len, 0);
 
<------>return res;
}
EXPORT_SYMBOL_GPL(iptunnel_metadata_reply);
 
int iptunnel_handle_offloads(struct sk_buff *skb,
<------><------><------>     int gso_type_mask)
{
<------>int err;
 
<------>if (likely(!skb->encapsulation)) {
<------><------>skb_reset_inner_headers(skb);
<------><------>skb->encapsulation = 1;
<------>}
 
<------>if (skb_is_gso(skb)) {
<------><------>err = skb_header_unclone(skb, GFP_ATOMIC);
<------><------>if (unlikely(err))
<------><------><------>return err;
<------><------>skb_shinfo(skb)->gso_type |= gso_type_mask;
<------><------>return 0;
<------>}
 
<------>if (skb->ip_summed != CHECKSUM_PARTIAL) {
<------><------>skb->ip_summed = CHECKSUM_NONE;
<------><------>/* We clear encapsulation here to prevent badly-written
<------><------> * drivers potentially deciding to offload an inner checksum
<------><------> * if we set CHECKSUM_PARTIAL on the outer header.
<------><------> * This should go away when the drivers are all fixed.
<------><------> */
<------><------>skb->encapsulation = 0;
<------>}
 
<------>return 0;
}
EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
 
/**
 * iptunnel_pmtud_build_icmp() - Build ICMP error message for PMTUD
 * @skb:	Original packet with L2 header
 * @mtu:	MTU value for ICMP error
 *
 * Return: length on success, negative error code if message couldn't be built.
 */
static int iptunnel_pmtud_build_icmp(struct sk_buff *skb, int mtu)
{
<------>const struct iphdr *iph = ip_hdr(skb);
<------>struct icmphdr *icmph;
<------>struct iphdr *niph;
<------>struct ethhdr eh;
<------>int len, err;
 
<------>if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr)))
<------><------>return -EINVAL;
 
<------>skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN);
<------>pskb_pull(skb, ETH_HLEN);
<------>skb_reset_network_header(skb);
 
<------>err = pskb_trim(skb, 576 - sizeof(*niph) - sizeof(*icmph));
<------>if (err)
<------><------>return err;
 
<------>len = skb->len + sizeof(*icmph);
<------>err = skb_cow(skb, sizeof(*niph) + sizeof(*icmph) + ETH_HLEN);
<------>if (err)
<------><------>return err;
 
<------>icmph = skb_push(skb, sizeof(*icmph));
<------>*icmph = (struct icmphdr) {
<------><------>.type			= ICMP_DEST_UNREACH,
<------><------>.code			= ICMP_FRAG_NEEDED,
<------><------>.checksum		= 0,
<------><------>.un.frag.__unused	= 0,
<------><------>.un.frag.mtu		= ntohs(mtu),
<------>};
<------>icmph->checksum = ip_compute_csum(icmph, len);
<------>skb_reset_transport_header(skb);
 
<------>niph = skb_push(skb, sizeof(*niph));
<------>*niph = (struct iphdr) {
<------><------>.ihl			= sizeof(*niph) / 4u,
<------><------>.version 		= 4,
<------><------>.tos 			= 0,
<------><------>.tot_len		= htons(len + sizeof(*niph)),
<------><------>.id			= 0,
<------><------>.frag_off		= htons(IP_DF),
<------><------>.ttl			= iph->ttl,
<------><------>.protocol		= IPPROTO_ICMP,
<------><------>.saddr			= iph->daddr,
<------><------>.daddr			= iph->saddr,
<------>};
<------>ip_send_check(niph);
<------>skb_reset_network_header(skb);
 
<------>skb->ip_summed = CHECKSUM_NONE;
 
<------>eth_header(skb, skb->dev, htons(eh.h_proto), eh.h_source, eh.h_dest, 0);
<------>skb_reset_mac_header(skb);
 
<------>return skb->len;
}
 
/**
 * iptunnel_pmtud_check_icmp() - Trigger ICMP reply if needed and allowed
 * @skb:	Buffer being sent by encapsulation, L2 headers expected
 * @mtu:	Network MTU for path
 *
 * Return: 0 for no ICMP reply, length if built, negative value on error.
 */
static int iptunnel_pmtud_check_icmp(struct sk_buff *skb, int mtu)
{
<------>const struct icmphdr *icmph = icmp_hdr(skb);
<------>const struct iphdr *iph = ip_hdr(skb);
 
<------>if (mtu < 576 || iph->frag_off != htons(IP_DF))
<------><------>return 0;
 
<------>if (ipv4_is_lbcast(iph->daddr)  || ipv4_is_multicast(iph->daddr) ||
<------>    ipv4_is_zeronet(iph->saddr) || ipv4_is_loopback(iph->saddr)  ||
<------>    ipv4_is_lbcast(iph->saddr)  || ipv4_is_multicast(iph->saddr))
<------><------>return 0;
 
<------>if (iph->protocol == IPPROTO_ICMP && icmp_is_err(icmph->type))
<------><------>return 0;
 
<------>return iptunnel_pmtud_build_icmp(skb, mtu);
}
 
#if IS_ENABLED(CONFIG_IPV6)
/**
 * iptunnel_pmtud_build_icmpv6() - Build ICMPv6 error message for PMTUD
 * @skb:	Original packet with L2 header
 * @mtu:	MTU value for ICMPv6 error
 *
 * Return: length on success, negative error code if message couldn't be built.
 */
static int iptunnel_pmtud_build_icmpv6(struct sk_buff *skb, int mtu)
{
<------>const struct ipv6hdr *ip6h = ipv6_hdr(skb);
<------>struct icmp6hdr *icmp6h;
<------>struct ipv6hdr *nip6h;
<------>struct ethhdr eh;
<------>int len, err;
<------>__wsum csum;
 
<------>if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr)))
<------><------>return -EINVAL;
 
<------>skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN);
<------>pskb_pull(skb, ETH_HLEN);
<------>skb_reset_network_header(skb);
 
<------>err = pskb_trim(skb, IPV6_MIN_MTU - sizeof(*nip6h) - sizeof(*icmp6h));
<------>if (err)
<------><------>return err;
 
<------>len = skb->len + sizeof(*icmp6h);
<------>err = skb_cow(skb, sizeof(*nip6h) + sizeof(*icmp6h) + ETH_HLEN);
<------>if (err)
<------><------>return err;
 
<------>icmp6h = skb_push(skb, sizeof(*icmp6h));
<------>*icmp6h = (struct icmp6hdr) {
<------><------>.icmp6_type		= ICMPV6_PKT_TOOBIG,
<------><------>.icmp6_code		= 0,
<------><------>.icmp6_cksum		= 0,
<------><------>.icmp6_mtu		= htonl(mtu),
<------>};
<------>skb_reset_transport_header(skb);
 
<------>nip6h = skb_push(skb, sizeof(*nip6h));
<------>*nip6h = (struct ipv6hdr) {
<------><------>.priority		= 0,
<------><------>.version		= 6,
<------><------>.flow_lbl		= { 0 },
<------><------>.payload_len		= htons(len),
<------><------>.nexthdr		= IPPROTO_ICMPV6,
<------><------>.hop_limit		= ip6h->hop_limit,
<------><------>.saddr			= ip6h->daddr,
<------><------>.daddr			= ip6h->saddr,
<------>};
<------>skb_reset_network_header(skb);
 
<------>csum = csum_partial(icmp6h, len, 0);
<------>icmp6h->icmp6_cksum = csum_ipv6_magic(&nip6h->saddr, &nip6h->daddr, len,
<------><------><------><------><------>      IPPROTO_ICMPV6, csum);
 
<------>skb->ip_summed = CHECKSUM_NONE;
 
<------>eth_header(skb, skb->dev, htons(eh.h_proto), eh.h_source, eh.h_dest, 0);
<------>skb_reset_mac_header(skb);
 
<------>return skb->len;
}
 
/**
 * iptunnel_pmtud_check_icmpv6() - Trigger ICMPv6 reply if needed and allowed
 * @skb:	Buffer being sent by encapsulation, L2 headers expected
 * @mtu:	Network MTU for path
 *
 * Return: 0 for no ICMPv6 reply, length if built, negative value on error.
 */
static int iptunnel_pmtud_check_icmpv6(struct sk_buff *skb, int mtu)
{
<------>const struct ipv6hdr *ip6h = ipv6_hdr(skb);
<------>int stype = ipv6_addr_type(&ip6h->saddr);
<------>u8 proto = ip6h->nexthdr;
<------>__be16 frag_off;
<------>int offset;
 
<------>if (mtu < IPV6_MIN_MTU)
<------><------>return 0;
 
<------>if (stype == IPV6_ADDR_ANY || stype == IPV6_ADDR_MULTICAST ||
<------>    stype == IPV6_ADDR_LOOPBACK)
<------><------>return 0;
 
<------>offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &proto,
<------><------><------><------>  &frag_off);
<------>if (offset < 0 || (frag_off & htons(~0x7)))
<------><------>return 0;
 
<------>if (proto == IPPROTO_ICMPV6) {
<------><------>struct icmp6hdr *icmp6h;
 
<------><------>if (!pskb_may_pull(skb, skb_network_header(skb) +
<------><------><------><------><------>offset + 1 - skb->data))
<------><------><------>return 0;
 
<------><------>icmp6h = (struct icmp6hdr *)(skb_network_header(skb) + offset);
<------><------>if (icmpv6_is_err(icmp6h->icmp6_type) ||
<------><------>    icmp6h->icmp6_type == NDISC_REDIRECT)
<------><------><------>return 0;
<------>}
 
<------>return iptunnel_pmtud_build_icmpv6(skb, mtu);
}
#endif /* IS_ENABLED(CONFIG_IPV6) */
 
/**
 * skb_tunnel_check_pmtu() - Check, update PMTU and trigger ICMP reply as needed
 * @skb:	Buffer being sent by encapsulation, L2 headers expected
 * @encap_dst:	Destination for tunnel encapsulation (outer IP)
 * @headroom:	Encapsulation header size, bytes
 * @reply:	Build matching ICMP or ICMPv6 message as a result
 *
 * L2 tunnel implementations that can carry IP and can be directly bridged
 * (currently UDP tunnels) can't always rely on IP forwarding paths to handle
 * PMTU discovery. In the bridged case, ICMP or ICMPv6 messages need to be built
 * based on payload and sent back by the encapsulation itself.
 *
 * For routable interfaces, we just need to update the PMTU for the destination.
 *
 * Return: 0 if ICMP error not needed, length if built, negative value on error
 */
int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst,
<------><------><------>  int headroom, bool reply)
{
<------>u32 mtu = dst_mtu(encap_dst) - headroom;
 
<------>if ((skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) ||
<------>    (!skb_is_gso(skb) && (skb->len - skb_mac_header_len(skb)) <= mtu))
<------><------>return 0;
 
<------>skb_dst_update_pmtu_no_confirm(skb, mtu);
 
<------>if (!reply || skb->pkt_type == PACKET_HOST)
<------><------>return 0;
 
<------>if (skb->protocol == htons(ETH_P_IP))
<------><------>return iptunnel_pmtud_check_icmp(skb, mtu);
 
#if IS_ENABLED(CONFIG_IPV6)
<------>if (skb->protocol == htons(ETH_P_IPV6))
<------><------>return iptunnel_pmtud_check_icmpv6(skb, mtu);
#endif
<------>return 0;
}
EXPORT_SYMBOL(skb_tunnel_check_pmtu);
 
/* Often modified stats are per cpu, other are shared (netdev->stats) */
void ip_tunnel_get_stats64(struct net_device *dev,
<------><------><------>   struct rtnl_link_stats64 *tot)
{
<------>netdev_stats_to_stats64(tot, &dev->stats);
<------>dev_fetch_sw_netstats(tot, dev->tstats);
}
EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
 
static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
<------>[LWTUNNEL_IP_UNSPEC]	= { .strict_start_type = LWTUNNEL_IP_OPTS },
<------>[LWTUNNEL_IP_ID]	= { .type = NLA_U64 },
<------>[LWTUNNEL_IP_DST]	= { .type = NLA_U32 },
<------>[LWTUNNEL_IP_SRC]	= { .type = NLA_U32 },
<------>[LWTUNNEL_IP_TTL]	= { .type = NLA_U8 },
<------>[LWTUNNEL_IP_TOS]	= { .type = NLA_U8 },
<------>[LWTUNNEL_IP_FLAGS]	= { .type = NLA_U16 },
<------>[LWTUNNEL_IP_OPTS]	= { .type = NLA_NESTED },
};
 
static const struct nla_policy ip_opts_policy[LWTUNNEL_IP_OPTS_MAX + 1] = {
<------>[LWTUNNEL_IP_OPTS_GENEVE]	= { .type = NLA_NESTED },
<------>[LWTUNNEL_IP_OPTS_VXLAN]	= { .type = NLA_NESTED },
<------>[LWTUNNEL_IP_OPTS_ERSPAN]	= { .type = NLA_NESTED },
};
 
static const struct nla_policy
geneve_opt_policy[LWTUNNEL_IP_OPT_GENEVE_MAX + 1] = {
<------>[LWTUNNEL_IP_OPT_GENEVE_CLASS]	= { .type = NLA_U16 },
<------>[LWTUNNEL_IP_OPT_GENEVE_TYPE]	= { .type = NLA_U8 },
<------>[LWTUNNEL_IP_OPT_GENEVE_DATA]	= { .type = NLA_BINARY, .len = 128 },
};
 
static const struct nla_policy
vxlan_opt_policy[LWTUNNEL_IP_OPT_VXLAN_MAX + 1] = {
<------>[LWTUNNEL_IP_OPT_VXLAN_GBP]	= { .type = NLA_U32 },
};
 
static const struct nla_policy
erspan_opt_policy[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1] = {
<------>[LWTUNNEL_IP_OPT_ERSPAN_VER]	= { .type = NLA_U8 },
<------>[LWTUNNEL_IP_OPT_ERSPAN_INDEX]	= { .type = NLA_U32 },
<------>[LWTUNNEL_IP_OPT_ERSPAN_DIR]	= { .type = NLA_U8 },
<------>[LWTUNNEL_IP_OPT_ERSPAN_HWID]	= { .type = NLA_U8 },
};
 
static int ip_tun_parse_opts_geneve(struct nlattr *attr,
<------><------><------><------>    struct ip_tunnel_info *info, int opts_len,
<------><------><------><------>    struct netlink_ext_ack *extack)
{
<------>struct nlattr *tb[LWTUNNEL_IP_OPT_GENEVE_MAX + 1];
<------>int data_len, err;
 
<------>err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_GENEVE_MAX, attr,
<------><------><------>       geneve_opt_policy, extack);
<------>if (err)
<------><------>return err;
 
<------>if (!tb[LWTUNNEL_IP_OPT_GENEVE_CLASS] ||
<------>    !tb[LWTUNNEL_IP_OPT_GENEVE_TYPE] ||
<------>    !tb[LWTUNNEL_IP_OPT_GENEVE_DATA])
<------><------>return -EINVAL;
 
<------>attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA];
<------>data_len = nla_len(attr);
<------>if (data_len % 4)
<------><------>return -EINVAL;
 
<------>if (info) {
<------><------>struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len;
 
<------><------>memcpy(opt->opt_data, nla_data(attr), data_len);
<------><------>opt->length = data_len / 4;
<------><------>attr = tb[LWTUNNEL_IP_OPT_GENEVE_CLASS];
<------><------>opt->opt_class = nla_get_be16(attr);
<------><------>attr = tb[LWTUNNEL_IP_OPT_GENEVE_TYPE];
<------><------>opt->type = nla_get_u8(attr);
<------><------>info->key.tun_flags |= TUNNEL_GENEVE_OPT;
<------>}
 
<------>return sizeof(struct geneve_opt) + data_len;
}
 
static int ip_tun_parse_opts_vxlan(struct nlattr *attr,
<------><------><------><------>   struct ip_tunnel_info *info, int opts_len,
<------><------><------><------>   struct netlink_ext_ack *extack)
{
<------>struct nlattr *tb[LWTUNNEL_IP_OPT_VXLAN_MAX + 1];
<------>int err;
 
<------>err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_VXLAN_MAX, attr,
<------><------><------>       vxlan_opt_policy, extack);
<------>if (err)
<------><------>return err;
 
<------>if (!tb[LWTUNNEL_IP_OPT_VXLAN_GBP])
<------><------>return -EINVAL;
 
<------>if (info) {
<------><------>struct vxlan_metadata *md =
<------><------><------>ip_tunnel_info_opts(info) + opts_len;
 
<------><------>attr = tb[LWTUNNEL_IP_OPT_VXLAN_GBP];
<------><------>md->gbp = nla_get_u32(attr);
<------><------>md->gbp &= VXLAN_GBP_MASK;
<------><------>info->key.tun_flags |= TUNNEL_VXLAN_OPT;
<------>}
 
<------>return sizeof(struct vxlan_metadata);
}
 
static int ip_tun_parse_opts_erspan(struct nlattr *attr,
<------><------><------><------>    struct ip_tunnel_info *info, int opts_len,
<------><------><------><------>    struct netlink_ext_ack *extack)
{
<------>struct nlattr *tb[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1];
<------>int err;
<------>u8 ver;
 
<------>err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_ERSPAN_MAX, attr,
<------><------><------>       erspan_opt_policy, extack);
<------>if (err)
<------><------>return err;
 
<------>if (!tb[LWTUNNEL_IP_OPT_ERSPAN_VER])
<------><------>return -EINVAL;
 
<------>ver = nla_get_u8(tb[LWTUNNEL_IP_OPT_ERSPAN_VER]);
<------>if (ver == 1) {
<------><------>if (!tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX])
<------><------><------>return -EINVAL;
<------>} else if (ver == 2) {
<------><------>if (!tb[LWTUNNEL_IP_OPT_ERSPAN_DIR] ||
<------><------>    !tb[LWTUNNEL_IP_OPT_ERSPAN_HWID])
<------><------><------>return -EINVAL;
<------>} else {
<------><------>return -EINVAL;
<------>}
 
<------>if (info) {
<------><------>struct erspan_metadata *md =
<------><------><------>ip_tunnel_info_opts(info) + opts_len;
 
<------><------>md->version = ver;
<------><------>if (ver == 1) {
<------><------><------>attr = tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX];
<------><------><------>md->u.index = nla_get_be32(attr);
<------><------>} else {
<------><------><------>attr = tb[LWTUNNEL_IP_OPT_ERSPAN_DIR];
<------><------><------>md->u.md2.dir = nla_get_u8(attr);
<------><------><------>attr = tb[LWTUNNEL_IP_OPT_ERSPAN_HWID];
<------><------><------>set_hwid(&md->u.md2, nla_get_u8(attr));
<------><------>}
 
<------><------>info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
<------>}
 
<------>return sizeof(struct erspan_metadata);
}
 
static int ip_tun_parse_opts(struct nlattr *attr, struct ip_tunnel_info *info,
<------><------><------>     struct netlink_ext_ack *extack)
{
<------>int err, rem, opt_len, opts_len = 0, type = 0;
<------>struct nlattr *nla;
 
<------>if (!attr)
<------><------>return 0;
 
<------>err = nla_validate(nla_data(attr), nla_len(attr), LWTUNNEL_IP_OPTS_MAX,
<------><------><------>   ip_opts_policy, extack);
<------>if (err)
<------><------>return err;
 
<------>nla_for_each_attr(nla, nla_data(attr), nla_len(attr), rem) {
<------><------>switch (nla_type(nla)) {
<------><------>case LWTUNNEL_IP_OPTS_GENEVE:
<------><------><------>if (type && type != TUNNEL_GENEVE_OPT)
<------><------><------><------>return -EINVAL;
<------><------><------>opt_len = ip_tun_parse_opts_geneve(nla, info, opts_len,
<------><------><------><------><------><------><------>   extack);
<------><------><------>if (opt_len < 0)
<------><------><------><------>return opt_len;
<------><------><------>opts_len += opt_len;
<------><------><------>if (opts_len > IP_TUNNEL_OPTS_MAX)
<------><------><------><------>return -EINVAL;
<------><------><------>type = TUNNEL_GENEVE_OPT;
<------><------><------>break;
<------><------>case LWTUNNEL_IP_OPTS_VXLAN:
<------><------><------>if (type)
<------><------><------><------>return -EINVAL;
<------><------><------>opt_len = ip_tun_parse_opts_vxlan(nla, info, opts_len,
<------><------><------><------><------><------><------>  extack);
<------><------><------>if (opt_len < 0)
<------><------><------><------>return opt_len;
<------><------><------>opts_len += opt_len;
<------><------><------>type = TUNNEL_VXLAN_OPT;
<------><------><------>break;
<------><------>case LWTUNNEL_IP_OPTS_ERSPAN:
<------><------><------>if (type)
<------><------><------><------>return -EINVAL;
<------><------><------>opt_len = ip_tun_parse_opts_erspan(nla, info, opts_len,
<------><------><------><------><------><------><------>   extack);
<------><------><------>if (opt_len < 0)
<------><------><------><------>return opt_len;
<------><------><------>opts_len += opt_len;
<------><------><------>type = TUNNEL_ERSPAN_OPT;
<------><------><------>break;
<------><------>default:
<------><------><------>return -EINVAL;
<------><------>}
<------>}
 
<------>return opts_len;
}
 
static int ip_tun_get_optlen(struct nlattr *attr,
<------><------><------>     struct netlink_ext_ack *extack)
{
<------>return ip_tun_parse_opts(attr, NULL, extack);
}
 
static int ip_tun_set_opts(struct nlattr *attr, struct ip_tunnel_info *info,
<------><------><------>   struct netlink_ext_ack *extack)
{
<------>return ip_tun_parse_opts(attr, info, extack);
}
 
static int ip_tun_build_state(struct net *net, struct nlattr *attr,
<------><------><------>      unsigned int family, const void *cfg,
<------><------><------>      struct lwtunnel_state **ts,
<------><------><------>      struct netlink_ext_ack *extack)
{
<------>struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
<------>struct lwtunnel_state *new_state;
<------>struct ip_tunnel_info *tun_info;
<------>int err, opt_len;
 
<------>err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_MAX, attr,
<------><------><------><------><------>  ip_tun_policy, extack);
<------>if (err < 0)
<------><------>return err;
 
<------>opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP_OPTS], extack);
<------>if (opt_len < 0)
<------><------>return opt_len;
 
<------>new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
<------>if (!new_state)
<------><------>return -ENOMEM;
 
<------>new_state->type = LWTUNNEL_ENCAP_IP;
 
<------>tun_info = lwt_tun_info(new_state);
 
<------>err = ip_tun_set_opts(tb[LWTUNNEL_IP_OPTS], tun_info, extack);
<------>if (err < 0) {
<------><------>lwtstate_free(new_state);
<------><------>return err;
<------>}
 
#ifdef CONFIG_DST_CACHE
<------>err = dst_cache_init(&tun_info->dst_cache, GFP_KERNEL);
<------>if (err) {
<------><------>lwtstate_free(new_state);
<------><------>return err;
<------>}
#endif
 
<------>if (tb[LWTUNNEL_IP_ID])
<------><------>tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]);
 
<------>if (tb[LWTUNNEL_IP_DST])
<------><------>tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]);
 
<------>if (tb[LWTUNNEL_IP_SRC])
<------><------>tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]);
 
<------>if (tb[LWTUNNEL_IP_TTL])
<------><------>tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]);
 
<------>if (tb[LWTUNNEL_IP_TOS])
<------><------>tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);
 
<------>if (tb[LWTUNNEL_IP_FLAGS])
<------><------>tun_info->key.tun_flags |=
<------><------><------><------>(nla_get_be16(tb[LWTUNNEL_IP_FLAGS]) &
<------><------><------><------> ~TUNNEL_OPTIONS_PRESENT);
 
<------>tun_info->mode = IP_TUNNEL_INFO_TX;
<------>tun_info->options_len = opt_len;
 
<------>*ts = new_state;
 
<------>return 0;
}
 
static void ip_tun_destroy_state(struct lwtunnel_state *lwtstate)
{
#ifdef CONFIG_DST_CACHE
<------>struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
 
<------>dst_cache_destroy(&tun_info->dst_cache);
#endif
}
 
static int ip_tun_fill_encap_opts_geneve(struct sk_buff *skb,
<------><------><------><------><------> struct ip_tunnel_info *tun_info)
{
<------>struct geneve_opt *opt;
<------>struct nlattr *nest;
<------>int offset = 0;
 
<------>nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_GENEVE);
<------>if (!nest)
<------><------>return -ENOMEM;
 
<------>while (tun_info->options_len > offset) {
<------><------>opt = ip_tunnel_info_opts(tun_info) + offset;
<------><------>if (nla_put_be16(skb, LWTUNNEL_IP_OPT_GENEVE_CLASS,
<------><------><------><------> opt->opt_class) ||
<------><------>    nla_put_u8(skb, LWTUNNEL_IP_OPT_GENEVE_TYPE, opt->type) ||
<------><------>    nla_put(skb, LWTUNNEL_IP_OPT_GENEVE_DATA, opt->length * 4,
<------><------><------>    opt->opt_data)) {
<------><------><------>nla_nest_cancel(skb, nest);
<------><------><------>return -ENOMEM;
<------><------>}
<------><------>offset += sizeof(*opt) + opt->length * 4;
<------>}
 
<------>nla_nest_end(skb, nest);
<------>return 0;
}
 
static int ip_tun_fill_encap_opts_vxlan(struct sk_buff *skb,
<------><------><------><------><------>struct ip_tunnel_info *tun_info)
{
<------>struct vxlan_metadata *md;
<------>struct nlattr *nest;
 
<------>nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_VXLAN);
<------>if (!nest)
<------><------>return -ENOMEM;
 
<------>md = ip_tunnel_info_opts(tun_info);
<------>if (nla_put_u32(skb, LWTUNNEL_IP_OPT_VXLAN_GBP, md->gbp)) {
<------><------>nla_nest_cancel(skb, nest);
<------><------>return -ENOMEM;
<------>}
 
<------>nla_nest_end(skb, nest);
<------>return 0;
}
 
static int ip_tun_fill_encap_opts_erspan(struct sk_buff *skb,
<------><------><------><------><------> struct ip_tunnel_info *tun_info)
{
<------>struct erspan_metadata *md;
<------>struct nlattr *nest;
 
<------>nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_ERSPAN);
<------>if (!nest)
<------><------>return -ENOMEM;
 
<------>md = ip_tunnel_info_opts(tun_info);
<------>if (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_VER, md->version))
<------><------>goto err;
 
<------>if (md->version == 1 &&
<------>    nla_put_be32(skb, LWTUNNEL_IP_OPT_ERSPAN_INDEX, md->u.index))
<------><------>goto err;
 
<------>if (md->version == 2 &&
<------>    (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_DIR, md->u.md2.dir) ||
<------>     nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_HWID,
<------><------><------>get_hwid(&md->u.md2))))
<------><------>goto err;
 
<------>nla_nest_end(skb, nest);
<------>return 0;
err:
<------>nla_nest_cancel(skb, nest);
<------>return -ENOMEM;
}
 
static int ip_tun_fill_encap_opts(struct sk_buff *skb, int type,
<------><------><------><------>  struct ip_tunnel_info *tun_info)
{
<------>struct nlattr *nest;
<------>int err = 0;
 
<------>if (!(tun_info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))
<------><------>return 0;
 
<------>nest = nla_nest_start_noflag(skb, type);
<------>if (!nest)
<------><------>return -ENOMEM;
 
<------>if (tun_info->key.tun_flags & TUNNEL_GENEVE_OPT)
<------><------>err = ip_tun_fill_encap_opts_geneve(skb, tun_info);
<------>else if (tun_info->key.tun_flags & TUNNEL_VXLAN_OPT)
<------><------>err = ip_tun_fill_encap_opts_vxlan(skb, tun_info);
<------>else if (tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)
<------><------>err = ip_tun_fill_encap_opts_erspan(skb, tun_info);
 
<------>if (err) {
<------><------>nla_nest_cancel(skb, nest);
<------><------>return err;
<------>}
 
<------>nla_nest_end(skb, nest);
<------>return 0;
}
 
static int ip_tun_fill_encap_info(struct sk_buff *skb,
<------><------><------><------>  struct lwtunnel_state *lwtstate)
{
<------>struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
 
<------>if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id,
<------><------><------> LWTUNNEL_IP_PAD) ||
<------>    nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) ||
<------>    nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) ||
<------>    nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) ||
<------>    nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) ||
<------>    nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags) ||
<------>    ip_tun_fill_encap_opts(skb, LWTUNNEL_IP_OPTS, tun_info))
<------><------>return -ENOMEM;
 
<------>return 0;
}
 
static int ip_tun_opts_nlsize(struct ip_tunnel_info *info)
{
<------>int opt_len;
 
<------>if (!(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))
<------><------>return 0;
 
<------>opt_len = nla_total_size(0);		/* LWTUNNEL_IP_OPTS */
<------>if (info->key.tun_flags & TUNNEL_GENEVE_OPT) {
<------><------>struct geneve_opt *opt;
<------><------>int offset = 0;
 
<------><------>opt_len += nla_total_size(0);	/* LWTUNNEL_IP_OPTS_GENEVE */
<------><------>while (info->options_len > offset) {
<------><------><------>opt = ip_tunnel_info_opts(info) + offset;
<------><------><------>opt_len += nla_total_size(2)	/* OPT_GENEVE_CLASS */
<------><------><------><------>   + nla_total_size(1)	/* OPT_GENEVE_TYPE */
<------><------><------><------>   + nla_total_size(opt->length * 4);
<------><------><------><------><------><------><------>/* OPT_GENEVE_DATA */
<------><------><------>offset += sizeof(*opt) + opt->length * 4;
<------><------>}
<------>} else if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
<------><------>opt_len += nla_total_size(0)	/* LWTUNNEL_IP_OPTS_VXLAN */
<------><------><------>   + nla_total_size(4);	/* OPT_VXLAN_GBP */
<------>} else if (info->key.tun_flags & TUNNEL_ERSPAN_OPT) {
<------><------>struct erspan_metadata *md = ip_tunnel_info_opts(info);
 
<------><------>opt_len += nla_total_size(0)	/* LWTUNNEL_IP_OPTS_ERSPAN */
<------><------><------>   + nla_total_size(1)	/* OPT_ERSPAN_VER */
<------><------><------>   + (md->version == 1 ? nla_total_size(4)
<------><------><------><------><------><------>/* OPT_ERSPAN_INDEX (v1) */
<------><------><------><------><------>       : nla_total_size(1) +
<------><------><------><------><------><------> nla_total_size(1));
<------><------><------><------><------><------>/* OPT_ERSPAN_DIR + HWID (v2) */
<------>}
 
<------>return opt_len;
}
 
static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
{
<------>return nla_total_size_64bit(8)	/* LWTUNNEL_IP_ID */
<------><------>+ nla_total_size(4)	/* LWTUNNEL_IP_DST */
<------><------>+ nla_total_size(4)	/* LWTUNNEL_IP_SRC */
<------><------>+ nla_total_size(1)	/* LWTUNNEL_IP_TOS */
<------><------>+ nla_total_size(1)	/* LWTUNNEL_IP_TTL */
<------><------>+ nla_total_size(2)	/* LWTUNNEL_IP_FLAGS */
<------><------>+ ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
<------><------><------><------><------>/* LWTUNNEL_IP_OPTS */
}
 
static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
{
<------>struct ip_tunnel_info *info_a = lwt_tun_info(a);
<------>struct ip_tunnel_info *info_b = lwt_tun_info(b);
 
<------>return memcmp(info_a, info_b, sizeof(info_a->key)) ||
<------>       info_a->mode != info_b->mode ||
<------>       info_a->options_len != info_b->options_len ||
<------>       memcmp(ip_tunnel_info_opts(info_a),
<------><------>      ip_tunnel_info_opts(info_b), info_a->options_len);
}
 
static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
<------>.build_state = ip_tun_build_state,
<------>.destroy_state = ip_tun_destroy_state,
<------>.fill_encap = ip_tun_fill_encap_info,
<------>.get_encap_size = ip_tun_encap_nlsize,
<------>.cmp_encap = ip_tun_cmp_encap,
<------>.owner = THIS_MODULE,
};
 
static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
<------>[LWTUNNEL_IP6_UNSPEC]	= { .strict_start_type = LWTUNNEL_IP6_OPTS },
<------>[LWTUNNEL_IP6_ID]		= { .type = NLA_U64 },
<------>[LWTUNNEL_IP6_DST]		= { .len = sizeof(struct in6_addr) },
<------>[LWTUNNEL_IP6_SRC]		= { .len = sizeof(struct in6_addr) },
<------>[LWTUNNEL_IP6_HOPLIMIT]		= { .type = NLA_U8 },
<------>[LWTUNNEL_IP6_TC]		= { .type = NLA_U8 },
<------>[LWTUNNEL_IP6_FLAGS]		= { .type = NLA_U16 },
<------>[LWTUNNEL_IP6_OPTS]		= { .type = NLA_NESTED },
};
 
static int ip6_tun_build_state(struct net *net, struct nlattr *attr,
<------><------><------>       unsigned int family, const void *cfg,
<------><------><------>       struct lwtunnel_state **ts,
<------><------><------>       struct netlink_ext_ack *extack)
{
<------>struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
<------>struct lwtunnel_state *new_state;
<------>struct ip_tunnel_info *tun_info;
<------>int err, opt_len;
 
<------>err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP6_MAX, attr,
<------><------><------><------><------>  ip6_tun_policy, extack);
<------>if (err < 0)
<------><------>return err;
 
<------>opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP6_OPTS], extack);
<------>if (opt_len < 0)
<------><------>return opt_len;
 
<------>new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
<------>if (!new_state)
<------><------>return -ENOMEM;
 
<------>new_state->type = LWTUNNEL_ENCAP_IP6;
 
<------>tun_info = lwt_tun_info(new_state);
 
<------>err = ip_tun_set_opts(tb[LWTUNNEL_IP6_OPTS], tun_info, extack);
<------>if (err < 0) {
<------><------>lwtstate_free(new_state);
<------><------>return err;
<------>}
 
<------>if (tb[LWTUNNEL_IP6_ID])
<------><------>tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]);
 
<------>if (tb[LWTUNNEL_IP6_DST])
<------><------>tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]);
 
<------>if (tb[LWTUNNEL_IP6_SRC])
<------><------>tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]);
 
<------>if (tb[LWTUNNEL_IP6_HOPLIMIT])
<------><------>tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]);
 
<------>if (tb[LWTUNNEL_IP6_TC])
<------><------>tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);
 
<------>if (tb[LWTUNNEL_IP6_FLAGS])
<------><------>tun_info->key.tun_flags |=
<------><------><------><------>(nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]) &
<------><------><------><------> ~TUNNEL_OPTIONS_PRESENT);
 
<------>tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6;
<------>tun_info->options_len = opt_len;
 
<------>*ts = new_state;
 
<------>return 0;
}
 
static int ip6_tun_fill_encap_info(struct sk_buff *skb,
<------><------><------><------>   struct lwtunnel_state *lwtstate)
{
<------>struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
 
<------>if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id,
<------><------><------> LWTUNNEL_IP6_PAD) ||
<------>    nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) ||
<------>    nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) ||
<------>    nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) ||
<------>    nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) ||
<------>    nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags) ||
<------>    ip_tun_fill_encap_opts(skb, LWTUNNEL_IP6_OPTS, tun_info))
<------><------>return -ENOMEM;
 
<------>return 0;
}
 
static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
{
<------>return nla_total_size_64bit(8)	/* LWTUNNEL_IP6_ID */
<------><------>+ nla_total_size(16)	/* LWTUNNEL_IP6_DST */
<------><------>+ nla_total_size(16)	/* LWTUNNEL_IP6_SRC */
<------><------>+ nla_total_size(1)	/* LWTUNNEL_IP6_HOPLIMIT */
<------><------>+ nla_total_size(1)	/* LWTUNNEL_IP6_TC */
<------><------>+ nla_total_size(2)	/* LWTUNNEL_IP6_FLAGS */
<------><------>+ ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
<------><------><------><------><------>/* LWTUNNEL_IP6_OPTS */
}
 
static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
<------>.build_state = ip6_tun_build_state,
<------>.fill_encap = ip6_tun_fill_encap_info,
<------>.get_encap_size = ip6_tun_encap_nlsize,
<------>.cmp_encap = ip_tun_cmp_encap,
<------>.owner = THIS_MODULE,
};
 
void __init ip_tunnel_core_init(void)
{
<------>/* If you land here, make sure whether increasing ip_tunnel_info's
<------> * options_len is a reasonable choice with its usage in front ends
<------> * (f.e., it's part of flow keys, etc).
<------> */
<------>BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255);
 
<------>lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
<------>lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
}
 
DEFINE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt);
EXPORT_SYMBOL(ip_tunnel_metadata_cnt);
 
void ip_tunnel_need_metadata(void)
{
<------>static_branch_inc(&ip_tunnel_metadata_cnt);
}
EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);
 
void ip_tunnel_unneed_metadata(void)
{
<------>static_branch_dec(&ip_tunnel_metadata_cnt);
}
EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);
 
/* Returns either the correct skb->protocol value, or 0 if invalid. */
__be16 ip_tunnel_parse_protocol(const struct sk_buff *skb)
{
<------>if (skb_network_header(skb) >= skb->head &&
<------>    (skb_network_header(skb) + sizeof(struct iphdr)) <= skb_tail_pointer(skb) &&
<------>    ip_hdr(skb)->version == 4)
<------><------>return htons(ETH_P_IP);
<------>if (skb_network_header(skb) >= skb->head &&
<------>    (skb_network_header(skb) + sizeof(struct ipv6hdr)) <= skb_tail_pointer(skb) &&
<------>    ipv6_hdr(skb)->version == 6)
<------><------>return htons(ETH_P_IPV6);
<------>return 0;
}
EXPORT_SYMBOL(ip_tunnel_parse_protocol);
 
const struct header_ops ip_tunnel_header_ops = { .parse_protocol = ip_tunnel_parse_protocol };
EXPORT_SYMBOL(ip_tunnel_header_ops);