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 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