IABSD.fr/src/sys/netinet/ip_gre.c

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• Author : bluhm
  Date : 2023-12-15 00:24:56
  Hash : 990f2b24
  Message : Use inpcb table mutex to set addresses. Protect all remaining write access to inp_faddr and inp_laddr with inpcb table mutex. Document inpcb locking for foreign and local address and port and routing table id. Reading will be made MP safe by adding per socket rw-locks in a next step. OK sashan@ mvs@

• sys/netinet/ip_gre.c

• /*      $OpenBSD: ip_gre.c,v 1.87 2023/12/15 00:24:56 bluhm Exp $ */
  /*	$NetBSD: ip_gre.c,v 1.9 1999/10/25 19:18:11 drochner Exp $ */
  
  /*
   * Copyright (c) 1998 The NetBSD Foundation, Inc.
   * All rights reserved.
   *
   * This code is derived from software contributed to The NetBSD Foundation
   * by Heiko W.Rupp <hwr@pilhuhn.de>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   */
  
  /*
   * decapsulate tunneled packets and send them on
   * output half is in net/if_gre.[ch]
   * This currently handles IPPROTO_GRE, IPPROTO_MOBILE
   */
  
  
  #include "gre.h"
  #if NGRE > 0
  
  #include <sys/param.h>
  #include <sys/systm.h>
  #include <sys/mbuf.h>
  #include <sys/protosw.h>
  #include <sys/socket.h>
  #include <sys/socketvar.h>
  #include <sys/sysctl.h>
  
  #include <net/if.h>
  #include <net/if_var.h>
  #include <net/route.h>
  
  #include <netinet/in.h>
  #include <netinet/ip.h>
  #include <netinet/ip_gre.h>
  #include <netinet/ip_var.h>
  #include <netinet/in_pcb.h>
  #include <netinet/in_var.h>
  
  #ifdef PIPEX
  #include <net/pipex.h>
  #endif
  
  const struct pr_usrreqs gre_usrreqs = {
  	.pru_attach	= rip_attach,
  	.pru_detach	= rip_detach,
  	.pru_bind	= rip_bind,
  	.pru_connect	= rip_connect,
  	.pru_disconnect	= rip_disconnect,
  	.pru_shutdown	= rip_shutdown,
  	.pru_send	= gre_send,
  	.pru_control	= in_control,
  	.pru_sockaddr	= in_sockaddr,
  	.pru_peeraddr	= in_peeraddr,
  };
  
  int
  gre_send(struct socket *so, struct mbuf *m, struct mbuf *nam,
      struct mbuf *control)
  {
  #ifdef  PIPEX 
  	struct inpcb *inp = sotoinpcb(so);
  
  	if (inp->inp_pipex) {
  		struct sockaddr_in *sin4;
  		const struct in_addr *ina_dst;
  
  		ina_dst = NULL;
  		if ((so->so_state & SS_ISCONNECTED) != 0)
  			ina_dst = &inp->inp_laddr;
  		else if (nam) {
  			if (in_nam2sin(nam, &sin4) == 0)
  				ina_dst = &sin4->sin_addr;
  		}
  		if (ina_dst != NULL) {
  			struct pipex_session *session;
  
  			session = pipex_pptp_userland_lookup_session_ipv4(m,
  			    *ina_dst);
  
  			if(session != NULL) {
  				m = pipex_pptp_userland_output(m, session);
  				pipex_rele_session(session);
  			}
  		}
  
  		if (m == NULL) {
  			m_freem(control);
  			return (ENOMEM);
  		}
  	}
  #endif
  	return rip_send(so, m, nam, control);
  }
  
  #endif /* if NGRE > 0 */