OXIESEC PANEL

Name	Size	Modified	Perms
📁 ..	-	11/17/2022 06:42:18 AM	rwxr-xr-x
📄 6lowpan.h	10.03 KB	01/28/2018 09:20:33 PM	rw-r--r--
📁 9p	-	11/17/2022 06:42:23 AM	rwxr-xr-x
📄 Space.h	1.15 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 act_api.h	6.38 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 addrconf.h	12.63 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 af_ieee802154.h	1.55 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 af_rxrpc.h	2.79 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 af_unix.h	2.22 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 af_vsock.h	7.21 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 ah.h	382 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 arp.h	2 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 atmclip.h	1.48 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 ax25.h	15.02 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 ax88796.h	998 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📁 bluetooth	-	11/17/2022 06:42:23 AM	rwxr-xr-x
📄 bond_3ad.h	9.79 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 bond_alb.h	6.6 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 bond_options.h	3.92 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 bonding.h	19.1 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 busy_poll.h	3.8 KB	11/01/2022 04:52:05 PM	rw-r--r--
📁 caif	-	11/17/2022 06:42:23 AM	rwxr-xr-x
📄 calipso.h	2.15 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 cfg80211-wext.h	1.95 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 cfg80211.h	221.24 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 cfg802154.h	10.89 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 checksum.h	4.76 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 cipso_ipv4.h	8.2 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 cls_cgroup.h	2.15 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 codel.h	5.65 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 codel_impl.h	7.98 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 codel_qdisc.h	2.9 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 compat.h	2.11 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 datalink.h	619 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 dcbevent.h	1.26 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 dcbnl.h	4.2 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 devlink.h	13.25 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 dn.h	6.88 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 dn_dev.h	5.36 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 dn_fib.h	3.98 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 dn_neigh.h	968 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 dn_nsp.h	5.83 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 dn_route.h	4.36 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 dsa.h	13.94 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 dsfield.h	1.11 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 dst.h	13.48 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 dst_cache.h	2.53 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 dst_metadata.h	5.39 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 dst_ops.h	2 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 erspan.h	2.11 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 esp.h	877 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 ethoc.h	538 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 fib_notifier.h	1.29 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 fib_rules.h	4.18 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 firewire.h	636 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 flow.h	6.16 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 flow_dissector.h	7.55 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 fou.h	549 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 fq.h	2.67 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 fq_impl.h	6.9 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 garp.h	2.62 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 gen_stats.h	2.34 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 genetlink.h	11.3 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 geneve.h	1.67 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 gre.h	2.99 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 gro_cells.h	443 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 gtp.h	633 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 gue.h	3.23 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 hwbm.h	937 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 icmp.h	2.01 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 ieee80211_radiotap.h	6.63 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 ieee802154_netdev.h	9.14 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 if_inet6.h	6.13 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 ife.h	1.06 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 ila.h	498 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 inet6_connection_sock.h	976 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 inet6_hashtables.h	3.7 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 inet_common.h	1.89 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 inet_connection_sock.h	10.48 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 inet_ecn.h	6.02 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 inet_frag.h	4.51 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 inet_hashtables.h	12.91 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 inet_sock.h	8.25 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 inet_timewait_sock.h	3.82 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 inetpeer.h	3.29 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 ip.h	18.51 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 ip6_checksum.h	2.89 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 ip6_fib.h	10.04 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 ip6_route.h	7.63 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 ip6_tunnel.h	4.72 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 ip_fib.h	10.72 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 ip_tunnels.h	13.61 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 ip_vs.h	46.78 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 ipcomp.h	659 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 ipconfig.h	811 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 ipv6.h	29.97 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 ipv6_frag.h	2.54 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 ipx.h	4.4 KB	01/28/2018 09:20:33 PM	rw-r--r--
📁 iucv	-	11/17/2022 06:42:23 AM	rwxr-xr-x
📄 iw_handler.h	20.91 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 kcm.h	4.96 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 l3mdev.h	5.86 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 lapb.h	4.75 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 lib80211.h	3.92 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 llc.h	4.41 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 llc_c_ac.h	9.31 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 llc_c_ev.h	10.68 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 llc_c_st.h	1.72 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 llc_conn.h	4.06 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 llc_if.h	2.16 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 llc_pdu.h	14.44 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 llc_s_ac.h	1.55 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 llc_s_ev.h	2.2 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 llc_s_st.h	947 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 llc_sap.h	1.08 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 lwtunnel.h	5.84 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 mac80211.h	230.36 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 mac802154.h	15.27 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 mip6.h	1.58 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 mld.h	2.8 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 mpls.h	932 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 mpls_iptunnel.h	827 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 mrp.h	3.03 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 ncsi.h	1.92 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 ndisc.h	13.77 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 neighbour.h	15.06 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 net_namespace.h	10.08 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 net_ratelimit.h	220 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 netevent.h	910 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📁 netfilter	-	11/17/2022 06:42:23 AM	rwxr-xr-x
📄 netlabel.h	20.74 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 netlink.h	40.39 KB	01/28/2018 09:20:33 PM	rw-r--r--
📁 netns	-	11/17/2022 06:42:23 AM	rwxr-xr-x
📄 netprio_cgroup.h	1.24 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 netrom.h	7.68 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 nexthop.h	865 bytes	11/01/2022 04:52:05 PM	rw-r--r--
📁 nfc	-	11/17/2022 06:42:23 AM	rwxr-xr-x
📄 nl802154.h	12.09 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 nsh.h	12.31 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 p8022.h	447 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📁 phonet	-	11/17/2022 06:42:23 AM	rwxr-xr-x
📄 ping.h	3.45 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 pkt_cls.h	17.34 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 pkt_sched.h	4.05 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 pptp.h	557 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 protocol.h	4.08 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 psample.h	860 bytes	11/01/2022 04:52:05 PM	rw-r--r--
📄 psnap.h	351 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 raw.h	2.07 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 rawv6.h	854 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 red.h	10.45 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 regulatory.h	10.12 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 request_sock.h	6.46 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 rose.h	7.62 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 route.h	10.02 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 rtnetlink.h	6.13 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 sch_generic.h	23.3 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 scm.h	3.5 KB	01/28/2018 09:20:33 PM	rw-r--r--
📁 sctp	-	11/17/2022 06:42:23 AM	rwxr-xr-x
📄 secure_seq.h	855 bytes	11/01/2022 04:52:05 PM	rw-r--r--
📄 seg6.h	1.66 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 seg6_hmac.h	1.65 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 slhc_vj.h	6.67 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 smc.h	440 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 snmp.h	5.23 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 sock.h	69.75 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 sock_reuseport.h	863 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 stp.h	383 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 strparser.h	3.75 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 switchdev.h	6.52 KB	01/28/2018 09:20:33 PM	rw-r--r--
📁 tc_act	-	11/17/2022 06:42:23 AM	rwxr-xr-x
📄 tcp.h	62.8 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 tcp_states.h	1.26 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 timewait_sock.h	1.11 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 tipc.h	2.34 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 tls.h	7.12 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 transp_v6.h	2.08 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 tso.h	515 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 tun_proto.h	988 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 udp.h	12.82 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 udp_tunnel.h	5.12 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 udplite.h	3.83 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 vsock_addr.h	1.05 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 vxlan.h	10.43 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 wext.h	1.51 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 wimax.h	19.97 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 x25.h	9.43 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 x25device.h	387 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 xfrm.h	53.72 KB	11/01/2022 04:52:05 PM	rw-r--r--

Editing: nsh.h

#ifndef __NET_NSH_H
#define __NET_NSH_H 1

#include <linux/skbuff.h>

/*
 * Network Service Header:
 *  0                   1                   2                   3
 *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |Ver|O|U|    TTL    |   Length  |U|U|U|U|MD Type| Next Protocol |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |          Service Path Identifier (SPI)        | Service Index |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                                                               |
 * ~               Mandatory/Optional Context Headers              ~
 * |                                                               |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *
 * Version: The version field is used to ensure backward compatibility
 * going forward with future NSH specification updates.  It MUST be set
 * to 0x0 by the sender, in this first revision of NSH.  Given the
 * widespread implementation of existing hardware that uses the first
 * nibble after an MPLS label stack for ECMP decision processing, this
 * document reserves version 01b and this value MUST NOT be used in
 * future versions of the protocol.  Please see [RFC7325] for further
 * discussion of MPLS-related forwarding requirements.
 *
 * O bit: Setting this bit indicates an Operations, Administration, and
 * Maintenance (OAM) packet.  The actual format and processing of SFC
 * OAM packets is outside the scope of this specification (see for
 * example [I-D.ietf-sfc-oam-framework] for one approach).
 *
 * The O bit MUST be set for OAM packets and MUST NOT be set for non-OAM
 * packets.  The O bit MUST NOT be modified along the SFP.
 *
 * SF/SFF/SFC Proxy/Classifier implementations that do not support SFC
 * OAM procedures SHOULD discard packets with O bit set, but MAY support
 * a configurable parameter to enable forwarding received SFC OAM
 * packets unmodified to the next element in the chain.  Forwarding OAM
 * packets unmodified by SFC elements that do not support SFC OAM
 * procedures may be acceptable for a subset of OAM functions, but can
 * result in unexpected outcomes for others, thus it is recommended to
 * analyze the impact of forwarding an OAM packet for all OAM functions
 * prior to enabling this behavior.  The configurable parameter MUST be
 * disabled by default.
 *
 * TTL: Indicates the maximum SFF hops for an SFP.  This field is used
 * for service plane loop detection.  The initial TTL value SHOULD be
 * configurable via the control plane; the configured initial value can
 * be specific to one or more SFPs.  If no initial value is explicitly
 * provided, the default initial TTL value of 63 MUST be used.  Each SFF
 * involved in forwarding an NSH packet MUST decrement the TTL value by
 * 1 prior to NSH forwarding lookup.  Decrementing by 1 from an incoming
 * value of 0 shall result in a TTL value of 63.  The packet MUST NOT be
 * forwarded if TTL is, after decrement, 0.
 *
 * All other flag fields, marked U, are unassigned and available for
 * future use, see Section 11.2.1.  Unassigned bits MUST be set to zero
 * upon origination, and MUST be ignored and preserved unmodified by
 * other NSH supporting elements.  Elements which do not understand the
 * meaning of any of these bits MUST NOT modify their actions based on
 * those unknown bits.
 *
 * Length: The total length, in 4-byte words, of NSH including the Base
 * Header, the Service Path Header, the Fixed Length Context Header or
 * Variable Length Context Header(s).  The length MUST be 0x6 for MD
 * Type equal to 0x1, and MUST be 0x2 or greater for MD Type equal to
 * 0x2.  The length of the NSH header MUST be an integer multiple of 4
 * bytes, thus variable length metadata is always padded out to a
 * multiple of 4 bytes.
 *
 * MD Type: Indicates the format of NSH beyond the mandatory Base Header
 * and the Service Path Header.  MD Type defines the format of the
 * metadata being carried.
 *
 * 0x0 - This is a reserved value.  Implementations SHOULD silently
 * discard packets with MD Type 0x0.
 *
 * 0x1 - This indicates that the format of the header includes a fixed
 * length Context Header (see Figure 4 below).
 *
 * 0x2 - This does not mandate any headers beyond the Base Header and
 * Service Path Header, but may contain optional variable length Context
 * Header(s).  The semantics of the variable length Context Header(s)
 * are not defined in this document.  The format of the optional
 * variable length Context Headers is provided in Section 2.5.1.
 *
 * 0xF - This value is reserved for experimentation and testing, as per
 * [RFC3692].  Implementations not explicitly configured to be part of
 * an experiment SHOULD silently discard packets with MD Type 0xF.
 *
 * Next Protocol: indicates the protocol type of the encapsulated data.
 * NSH does not alter the inner payload, and the semantics on the inner
 * protocol remain unchanged due to NSH service function chaining.
 * Please see the IANA Considerations section below, Section 11.2.5.
 *
 * This document defines the following Next Protocol values:
 *
 * 0x1: IPv4
 * 0x2: IPv6
 * 0x3: Ethernet
 * 0x4: NSH
 * 0x5: MPLS
 * 0xFE: Experiment 1
 * 0xFF: Experiment 2
 *
 * Packets with Next Protocol values not supported SHOULD be silently
 * dropped by default, although an implementation MAY provide a
 * configuration parameter to forward them.  Additionally, an
 * implementation not explicitly configured for a specific experiment
 * [RFC3692] SHOULD silently drop packets with Next Protocol values 0xFE
 * and 0xFF.
 *
 * Service Path Identifier (SPI): Identifies a service path.
 * Participating nodes MUST use this identifier for Service Function
 * Path selection.  The initial classifier MUST set the appropriate SPI
 * for a given classification result.
 *
 * Service Index (SI): Provides location within the SFP.  The initial
 * classifier for a given SFP SHOULD set the SI to 255, however the
 * control plane MAY configure the initial value of SI as appropriate
 * (i.e., taking into account the length of the service function path).
 * The Service Index MUST be decremented by a value of 1 by Service
 * Functions or by SFC Proxy nodes after performing required services
 * and the new decremented SI value MUST be used in the egress packet's
 * NSH.  The initial Classifier MUST send the packet to the first SFF in
 * the identified SFP for forwarding along an SFP.  If re-classification
 * occurs, and that re-classification results in a new SPI, the
 * (re)classifier is, in effect, the initial classifier for the
 * resultant SPI.
 *
 * The SI is used in conjunction the with Service Path Identifier for
 * Service Function Path Selection and for determining the next SFF/SF
 * in the path.  The SI is also valuable when troubleshooting or
 * reporting service paths.  Additionally, while the TTL field is the
 * main mechanism for service plane loop detection, the SI can also be
 * used for detecting service plane loops.
 *
 * When the Base Header specifies MD Type = 0x1, a Fixed Length Context
 * Header (16-bytes) MUST be present immediately following the Service
 * Path Header. The value of a Fixed Length Context
 * Header that carries no metadata MUST be set to zero.
 *
 * When the base header specifies MD Type = 0x2, zero or more Variable
 * Length Context Headers MAY be added, immediately following the
 * Service Path Header (see Figure 5).  Therefore, Length = 0x2,
 * indicates that only the Base Header followed by the Service Path
 * Header are present.  The optional Variable Length Context Headers
 * MUST be of an integer number of 4-bytes.  The base header Length
 * field MUST be used to determine the offset to locate the original
 * packet or frame for SFC nodes that require access to that
 * information.
 *
 * The format of the optional variable length Context Headers
 *
 *  0                   1                   2                   3
 *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |          Metadata Class       |      Type     |U|    Length   |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                      Variable Metadata                        |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *
 * Metadata Class (MD Class): Defines the scope of the 'Type' field to
 * provide a hierarchical namespace.  The IANA Considerations
 * Section 11.2.4 defines how the MD Class values can be allocated to
 * standards bodies, vendors, and others.
 *
 * Type: Indicates the explicit type of metadata being carried.  The
 * definition of the Type is the responsibility of the MD Class owner.
 *
 * Unassigned bit: One unassigned bit is available for future use. This
 * bit MUST NOT be set, and MUST be ignored on receipt.
 *
 * Length: Indicates the length of the variable metadata, in bytes.  In
 * case the metadata length is not an integer number of 4-byte words,
 * the sender MUST add pad bytes immediately following the last metadata
 * byte to extend the metadata to an integer number of 4-byte words.
 * The receiver MUST round up the length field to the nearest 4-byte
 * word boundary, to locate and process the next field in the packet.
 * The receiver MUST access only those bytes in the metadata indicated
 * by the length field (i.e., actual number of bytes) and MUST ignore
 * the remaining bytes up to the nearest 4-byte word boundary.  The
 * Length may be 0 or greater.
 *
 * A value of 0 denotes a Context Header without a Variable Metadata
 * field.
 *
 * [0] https://datatracker.ietf.org/doc/draft-ietf-sfc-nsh/
 */

/**
 * struct nsh_md1_ctx - Keeps track of NSH context data
 * @nshc<1-4>: NSH Contexts.
 */
struct nsh_md1_ctx {
	__be32 context[4];
};

struct nsh_md2_tlv {
	__be16 md_class;
	u8 type;
	u8 length;
	u8 md_value[];
};

struct nshhdr {
	__be16 ver_flags_ttl_len;
	u8 mdtype;
	u8 np;
	__be32 path_hdr;
	union {
	    struct nsh_md1_ctx md1;
	    struct nsh_md2_tlv md2;
	};
};

/* Masking NSH header fields. */
#define NSH_VER_MASK       0xc000
#define NSH_VER_SHIFT      14
#define NSH_FLAGS_MASK     0x3000
#define NSH_FLAGS_SHIFT    12
#define NSH_TTL_MASK       0x0fc0
#define NSH_TTL_SHIFT      6
#define NSH_LEN_MASK       0x003f
#define NSH_LEN_SHIFT      0

#define NSH_MDTYPE_MASK    0x0f
#define NSH_MDTYPE_SHIFT   0

#define NSH_SPI_MASK       0xffffff00
#define NSH_SPI_SHIFT      8
#define NSH_SI_MASK        0x000000ff
#define NSH_SI_SHIFT       0

/* MD Type Registry. */
#define NSH_M_TYPE1     0x01
#define NSH_M_TYPE2     0x02
#define NSH_M_EXP1      0xFE
#define NSH_M_EXP2      0xFF

/* NSH Base Header Length */
#define NSH_BASE_HDR_LEN  8

/* NSH MD Type 1 header Length. */
#define NSH_M_TYPE1_LEN   24

/* NSH header maximum Length. */
#define NSH_HDR_MAX_LEN 256

/* NSH context headers maximum Length. */
#define NSH_CTX_HDRS_MAX_LEN 248

static inline struct nshhdr *nsh_hdr(struct sk_buff *skb)
{
	return (struct nshhdr *)skb_network_header(skb);
}

static inline u16 nsh_hdr_len(const struct nshhdr *nsh)
{
	return ((ntohs(nsh->ver_flags_ttl_len) & NSH_LEN_MASK)
		>> NSH_LEN_SHIFT) << 2;
}

static inline u8 nsh_get_ver(const struct nshhdr *nsh)
{
	return (ntohs(nsh->ver_flags_ttl_len) & NSH_VER_MASK)
		>> NSH_VER_SHIFT;
}

static inline u8 nsh_get_flags(const struct nshhdr *nsh)
{
	return (ntohs(nsh->ver_flags_ttl_len) & NSH_FLAGS_MASK)
		>> NSH_FLAGS_SHIFT;
}

static inline u8 nsh_get_ttl(const struct nshhdr *nsh)
{
	return (ntohs(nsh->ver_flags_ttl_len) & NSH_TTL_MASK)
		>> NSH_TTL_SHIFT;
}

static inline void __nsh_set_xflag(struct nshhdr *nsh, u16 xflag, u16 xmask)
{
	nsh->ver_flags_ttl_len
		= (nsh->ver_flags_ttl_len & ~htons(xmask)) | htons(xflag);
}

static inline void nsh_set_flags_and_ttl(struct nshhdr *nsh, u8 flags, u8 ttl)
{
	__nsh_set_xflag(nsh, ((flags << NSH_FLAGS_SHIFT) & NSH_FLAGS_MASK) |
			     ((ttl << NSH_TTL_SHIFT) & NSH_TTL_MASK),
			NSH_FLAGS_MASK | NSH_TTL_MASK);
}

static inline void nsh_set_flags_ttl_len(struct nshhdr *nsh, u8 flags,
					 u8 ttl, u8 len)
{
	len = len >> 2;
	__nsh_set_xflag(nsh, ((flags << NSH_FLAGS_SHIFT) & NSH_FLAGS_MASK) |
			     ((ttl << NSH_TTL_SHIFT) & NSH_TTL_MASK) |
			     ((len << NSH_LEN_SHIFT) & NSH_LEN_MASK),
			NSH_FLAGS_MASK | NSH_TTL_MASK | NSH_LEN_MASK);
}

int nsh_push(struct sk_buff *skb, const struct nshhdr *pushed_nh);
int nsh_pop(struct sk_buff *skb);

#endif /* __NET_NSH_H */