Esempi in C++ (Cpp) per TUN_MTU_SIZE_DYNAMIC

Esempio n. 1

File: forward.c Progetto: ThomasHabets/openvpn

void
process_ipv4_header (struct context *c, unsigned int flags, struct buffer *buf)
{
  if (!c->options.ce.mssfix)
    flags &= ~PIPV4_MSSFIX;
#if PASSTOS_CAPABILITY
  if (!c->options.passtos)
    flags &= ~PIPV4_PASSTOS;
#endif
  if (!c->options.route_gateway_via_dhcp)
    flags &= ~PIPV4_EXTRACT_DHCP_ROUTER;

  if (buf->len > 0)
    {
      /*
       * The --passtos and --mssfix options require
       * us to examine the IPv4 header.
       */
#if PASSTOS_CAPABILITY
      if (flags & (PIPV4_PASSTOS|PIPV4_MSSFIX))
#else
      if (flags & PIPV4_MSSFIX)
#endif
	{
	  struct buffer ipbuf = *buf;
	  if (is_ipv4 (TUNNEL_TYPE (c->c1.tuntap), &ipbuf))
	    {
#if PASSTOS_CAPABILITY
	      /* extract TOS from IP header */
	      if (flags & PIPV4_PASSTOS)
		link_socket_extract_tos (c->c2.link_socket, &ipbuf);
#endif
			  
	      /* possibly alter the TCP MSS */
	      if (flags & PIPV4_MSSFIX)
		mss_fixup (&ipbuf, MTU_TO_MSS (TUN_MTU_SIZE_DYNAMIC (&c->c2.frame)));

#ifdef ENABLE_CLIENT_NAT
	      /* possibly do NAT on packet */
	      if ((flags & PIPV4_CLIENT_NAT) && c->options.client_nat)
		{
		  const int direction = (flags & PIPV4_OUTGOING) ? CN_INCOMING : CN_OUTGOING;
		  client_nat_transform (c->options.client_nat, &ipbuf, direction);
		}
#endif
	      /* possibly extract a DHCP router message */
	      if (flags & PIPV4_EXTRACT_DHCP_ROUTER)
		{
		  const in_addr_t dhcp_router = dhcp_extract_router_msg (&ipbuf);
		  if (dhcp_router)
		    route_list_add_vpn_gateway (c->c1.route_list, c->c2.es, dhcp_router);
		}
	    }
	}
    }
}

Esempio n. 2

File: forward.c Progetto: jmadhav/lib

void
process_ipv4_header (struct context *c, unsigned int flags, struct buffer *buf)
{
  if (!c->options.mssfix)
    flags &= ~PIPV4_MSSFIX;
#if PASSTOS_CAPABILITY
  if (!c->options.passtos)
    flags &= ~PIPV4_PASSTOS;
#endif
  if (!c->options.route_gateway_via_dhcp || !route_list_default_gateway_needed (c->c1.route_list))
    flags &= ~PIPV4_EXTRACT_DHCP_ROUTER;

  if (buf->len > 0)
    {
      /*
       * The --passtos and --mssfix options require
       * us to examine the IPv4 header.
       */
#if PASSTOS_CAPABILITY
      if (flags & (PIPV4_PASSTOS|PIPV4_MSSFIX))
#else
      if (flags & PIPV4_MSSFIX)
#endif
	{
	  struct buffer ipbuf = *buf;
	  if (is_ipv4 (TUNNEL_TYPE (c->c1.tuntap), &ipbuf))
	    {
#if PASSTOS_CAPABILITY
	      /* extract TOS from IP header */
	      if (flags & PIPV4_PASSTOS)
		link_socket_extract_tos (c->c2.link_socket, &ipbuf);
#endif
			  
	      /* possibly alter the TCP MSS */
	      if (flags & PIPV4_MSSFIX)
		mss_fixup (&ipbuf, MTU_TO_MSS (TUN_MTU_SIZE_DYNAMIC (&c->c2.frame)));

	      /* possibly extract a DHCP router message */
	      if (flags & PIPV4_EXTRACT_DHCP_ROUTER)
		{
		  const in_addr_t dhcp_router = dhcp_extract_router_msg (&ipbuf);
		  route_list_add_default_gateway (c->c1.route_list, c->c2.es, dhcp_router);
		}
	    }
	}
    }
}