1/*      $OpenBSD: ip_gre.c,v 1.87 2023/12/15 00:24:56 bluhm Exp $ */
2/*	$NetBSD: ip_gre.c,v 1.9 1999/10/25 19:18:11 drochner Exp $ */
3
4/*
5 * Copyright (c) 1998 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Heiko W.Rupp <hwr@pilhuhn.de>
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33/*
34 * decapsulate tunneled packets and send them on
35 * output half is in net/if_gre.[ch]
36 * This currently handles IPPROTO_GRE, IPPROTO_MOBILE
37 */
38
39
40#include "gre.h"
41#if NGRE > 0
42
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/mbuf.h>
46#include <sys/protosw.h>
47#include <sys/socket.h>
48#include <sys/socketvar.h>
49#include <sys/sysctl.h>
50
51#include <net/if.h>
52#include <net/if_var.h>
53#include <net/route.h>
54
55#include <netinet/in.h>
56#include <netinet/ip.h>
57#include <netinet/ip_gre.h>
58#include <netinet/ip_var.h>
59#include <netinet/in_pcb.h>
60#include <netinet/in_var.h>
61
62#ifdef PIPEX
63#include <net/pipex.h>
64#endif
65
66const struct pr_usrreqs gre_usrreqs = {
67	.pru_attach	= rip_attach,
68	.pru_detach	= rip_detach,
69	.pru_bind	= rip_bind,
70	.pru_connect	= rip_connect,
71	.pru_disconnect	= rip_disconnect,
72	.pru_shutdown	= rip_shutdown,
73	.pru_send	= gre_send,
74	.pru_control	= in_control,
75	.pru_sockaddr	= in_sockaddr,
76	.pru_peeraddr	= in_peeraddr,
77};
78
79int
80gre_send(struct socket *so, struct mbuf *m, struct mbuf *nam,
81    struct mbuf *control)
82{
83#ifdef  PIPEX
84	struct inpcb *inp = sotoinpcb(so);
85
86	if (inp->inp_pipex) {
87		struct sockaddr_in *sin4;
88		const struct in_addr *ina_dst;
89
90		ina_dst = NULL;
91		if ((so->so_state & SS_ISCONNECTED) != 0)
92			ina_dst = &inp->inp_laddr;
93		else if (nam) {
94			if (in_nam2sin(nam, &sin4) == 0)
95				ina_dst = &sin4->sin_addr;
96		}
97		if (ina_dst != NULL) {
98			struct pipex_session *session;
99
100			session = pipex_pptp_userland_lookup_session_ipv4(m,
101			    *ina_dst);
102
103			if(session != NULL) {
104				m = pipex_pptp_userland_output(m, session);
105				pipex_rele_session(session);
106			}
107		}
108
109		if (m == NULL) {
110			m_freem(control);
111			return (ENOMEM);
112		}
113	}
114#endif
115	return rip_send(so, m, nam, control);
116}
117
118#endif /* if NGRE > 0 */
119