1 /* $OpenBSD: ip_gre.c,v 1.89 2025/01/01 13:44:22 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 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/mbuf.h>
42 #include <sys/protosw.h>
43 #include <sys/socket.h>
44 #include <sys/socketvar.h>
45 #include <sys/sysctl.h>
46
47 #include <net/if.h>
48 #include <net/if_var.h>
49 #include <net/route.h>
50
51 #include <netinet/in.h>
52 #include <netinet/ip.h>
53 #include <netinet/ip_gre.h>
54 #include <netinet/ip_var.h>
55 #include <netinet/in_pcb.h>
56 #include <netinet/in_var.h>
57
58 #ifdef PIPEX
59 #include <net/pipex.h>
60 #endif
61
62 const struct pr_usrreqs gre_usrreqs = {
63 .pru_attach = rip_attach,
64 .pru_detach = rip_detach,
65 .pru_bind = rip_bind,
66 .pru_connect = rip_connect,
67 .pru_disconnect = rip_disconnect,
68 .pru_shutdown = rip_shutdown,
69 .pru_send = gre_send,
70 .pru_control = in_control,
71 .pru_sockaddr = in_sockaddr,
72 .pru_peeraddr = in_peeraddr,
73 };
74
75 int
gre_send(struct socket * so,struct mbuf * m,struct mbuf * nam,struct mbuf * control)76 gre_send(struct socket *so, struct mbuf *m, struct mbuf *nam,
77 struct mbuf *control)
78 {
79 #ifdef PIPEX
80 struct inpcb *inp = sotoinpcb(so);
81
82 if (inp->inp_pipex) {
83 struct sockaddr_in *sin4;
84 const struct in_addr *ina_dst;
85
86 ina_dst = NULL;
87 if ((so->so_state & SS_ISCONNECTED) != 0)
88 ina_dst = &inp->inp_laddr;
89 else if (nam) {
90 if (in_nam2sin(nam, &sin4) == 0)
91 ina_dst = &sin4->sin_addr;
92 }
93 if (ina_dst != NULL) {
94 struct pipex_session *session;
95
96 session = pipex_pptp_userland_lookup_session_ipv4(m,
97 *ina_dst);
98
99 if(session != NULL) {
100 m = pipex_pptp_userland_output(m, session);
101 pipex_rele_session(session);
102 }
103 }
104
105 if (m == NULL) {
106 m_freem(control);
107 return (ENOMEM);
108 }
109 }
110 #endif
111 return rip_send(so, m, nam, control);
112 }
113