1/* $OpenBSD: ip_ipip.h,v 1.15 2025/03/02 21:28:32 bluhm Exp $ */
2/*
3 * The authors of this code are John Ioannidis (ji@tla.org),
4 * Angelos D. Keromytis (kermit@csd.uch.gr) and
5 * Niels Provos (provos@physnet.uni-hamburg.de).
6 *
7 * The original version of this code was written by John Ioannidis
8 * for BSD/OS in Athens, Greece, in November 1995.
9 *
10 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
11 * by Angelos D. Keromytis.
12 *
13 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
14 * and Niels Provos.
15 *
16 * Additional features in 1999 by Angelos D. Keromytis.
17 *
18 * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
19 * Angelos D. Keromytis and Niels Provos.
20 * Copyright (c) 2001, Angelos D. Keromytis.
21 *
22 * Permission to use, copy, and modify this software with or without fee
23 * is hereby granted, provided that this entire notice is included in
24 * all copies of any software which is or includes a copy or
25 * modification of this software.
26 * You may use this code under the GNU public license if you so wish. Please
27 * contribute changes back to the authors under this freer than GPL license
28 * so that we may further the use of strong encryption without limitations to
29 * all.
30 *
31 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
32 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
33 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
34 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
35 * PURPOSE.
36 */
37
38#ifndef _NETINET_IPIP_H_
39#define _NETINET_IPIP_H_
40
41/*
42 * IP-inside-IP processing.
43 * Not quite all the functionality of RFC-1853, but the main idea is there.
44 */
45
46struct ipipstat {
47 u_int64_t ipips_ipackets; /* total input packets */
48 u_int64_t ipips_opackets; /* total output packets */
49 u_int64_t ipips_hdrops; /* packet shorter than header shows */
50 u_int64_t ipips_qfull;
51 u_int64_t ipips_ibytes;
52 u_int64_t ipips_obytes;
53 u_int64_t ipips_pdrops; /* packet dropped due to policy */
54 u_int64_t ipips_spoof; /* IP spoofing attempts */
55 u_int64_t ipips_family; /* Protocol family mismatch */
56 u_int64_t ipips_unspec; /* Missing tunnel endpoint address */
57};
58
59#define IP4_DEFAULT_TTL 0
60#define IP4_SAME_TTL -1
61
62/*
63 * Names for IPIP sysctl objects
64 */
65#define IPIPCTL_ALLOW 1 /* accept incoming IP4 packets */
66#define IPIPCTL_STATS 2 /* IPIP stats */
67#define IPIPCTL_MAXID 3
68
69#define IPIPCTL_NAMES { \
70 { 0, 0 }, \
71 { "allow", CTLTYPE_INT }, \
72 { "stats", CTLTYPE_STRUCT }, \
73}
74
75#ifdef _KERNEL
76
77#include <sys/percpu.h>
78
79enum ipipstat_counters {
80 ipips_ipackets,
81 ipips_opackets,
82 ipips_hdrops,
83 ipips_qfull,
84 ipips_ibytes,
85 ipips_obytes,
86 ipips_pdrops,
87 ipips_spoof,
88 ipips_family,
89 ipips_unspec,
90 ipips_ncounters
91};
92
93extern struct cpumem *ipipcounters;
94
95static inline void
96ipipstat_inc(enum ipipstat_counters c)
97{
98 counters_inc(ipipcounters, c);
99}
100
101static inline void
102ipipstat_add(enum ipipstat_counters c, uint64_t v)
103{
104 counters_add(ipipcounters, c, v);
105}
106
107static inline void
108ipipstat_pkt(enum ipipstat_counters p, enum ipipstat_counters b, uint64_t v)
109{
110 counters_pkt(ipipcounters, p, b, v);
111}
112
113struct tdb;
114
115void ipip_init(void);
116int ipip_input(struct mbuf **, int *, int, int, struct netstack *);
117int ipip_input_if(struct mbuf **, int *, int, int, int, struct ifnet *,
118 struct netstack *);
119int ipip_output(struct mbuf **, struct tdb *);
120int ipip_sysctl(int *, u_int, void *, size_t *, void *, size_t);
121
122extern int ipip_allow;
123#endif /* _KERNEL */
124#endif /* _NETINET_IPIP_H_ */