1 /* $OpenBSD: ip_gre.c,v 1.71 2018/02/07 22:30:59 dlg 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/route.h> 53 54 #include <netinet/in.h> 55 #include <netinet/ip.h> 56 #include <netinet/ip_var.h> 57 #include <netinet/in_pcb.h> 58 59 #ifdef PIPEX 60 #include <net/pipex.h> 61 #endif 62 63 int 64 gre_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 65 struct mbuf *control, struct proc *p) 66 { 67 #ifdef PIPEX 68 struct inpcb *inp = sotoinpcb(so); 69 70 if (inp != NULL && inp->inp_pipex && req == PRU_SEND) { 71 struct sockaddr_in *sin4; 72 struct in_addr *ina_dst; 73 struct pipex_session *session; 74 75 ina_dst = NULL; 76 if ((so->so_state & SS_ISCONNECTED) != 0) { 77 inp = sotoinpcb(so); 78 if (inp) 79 ina_dst = &inp->inp_laddr; 80 } else if (nam) { 81 if (in_nam2sin(nam, &sin4) == 0) 82 ina_dst = &sin4->sin_addr; 83 } 84 if (ina_dst != NULL && 85 (session = pipex_pptp_userland_lookup_session_ipv4(m, 86 *ina_dst))) 87 m = pipex_pptp_userland_output(m, session); 88 89 if (m == NULL) 90 return (ENOMEM); 91 } 92 #endif 93 return rip_usrreq(so, req, m, nam, control, p); 94 } 95 #endif /* if NGRE > 0 */ 96