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
66 const 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
79 int
gre_send(struct socket * so,struct mbuf * m,struct mbuf * nam,struct mbuf * control)80 gre_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