ip_gre.c

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    1 /*      $OpenBSD: ip_gre.c,v 1.85 2022/10/17 14:49:02 mvs 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
   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                 struct in_addr *ina_dst;
   89 
   90                 ina_dst = NULL;
   91                 if ((so->so_state & SS_ISCONNECTED) != 0) {
   92                         inp = sotoinpcb(so);
   93                         if (inp)
   94                                 ina_dst = &inp->inp_laddr;
   95                 } else if (nam) {
   96                         if (in_nam2sin(nam, &sin4) == 0)
   97                                 ina_dst = &sin4->sin_addr;
   98                 }
   99                 if (ina_dst != NULL) {
  100                         struct pipex_session *session;
  101 
  102                         session = pipex_pptp_userland_lookup_session_ipv4(m,
  103                             *ina_dst);
  104 
  105                         if(session != NULL) {
  106                                 m = pipex_pptp_userland_output(m, session);
  107                                 pipex_rele_session(session);
  108                         }
  109                 }
  110 
  111                 if (m == NULL) {
  112                         m_freem(control);
  113                         return (ENOMEM);
  114                 }
  115         }
  116 #endif
  117         return rip_send(so, m, nam, control);
  118 }
  119 
  120 #endif /* if NGRE > 0 */

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FreeBSD/Linux Kernel Cross Reference sys/netinet/ip_gre.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_gre.c