More IGMP logic

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2783 42af7a65-404d-4744-a932-0658087f49c3

2 files changed, 278 insertions, 2 deletions

diff --git a/nuttx/net/uip/Make.defs b/nuttx/net/uip/Make.defs
index f3686dfd2..f113ec3a7 100644
--- a/nuttx/net/uip/Make.defs
+++ b/nuttx/net/uip/Make.defs
@@ -81,8 +81,8 @@ endif
 # IGMP source files
 
 ifeq ($(CONFIG_NET_IGMP),y)
-UIP_CSRCS += uip_igmpinit.c uip_igmpgroup.c uip_igmpjoin.c uip_igmpleave.c \
-	     uip_igmpmsg.c uip_igmptimer.c
+UIP_CSRCS += uip_igmpinit.c uip_igmpgroup.c uip_igmpinput.c uip_igmpjoin.c \
+	     uip_igmpleave.c uip_igmpmsg.c uip_igmptimer.c
 endif
 
 endif
diff --git a/nuttx/net/uip/uip_igmpinput.c b/nuttx/net/uip/uip_igmpinput.c
new file mode 100755
index 000000000..e2c143fc7
--- /dev/null
+++ b/nuttx/net/uip/uip_igmpinput.c
@@ -0,0 +1,276 @@
+/****************************************************************************

+ * net/uip/uip_igminput.c

+ *

+ *   Copyright (C) 2010 Gregory Nutt. All rights reserved.

+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>

+ *

+ * The NuttX implementation of IGMP was inspired by the IGMP add-on for the

+ * lwIP TCP/IP stack by Steve Reynolds:

+ *

+ *   Copyright (c) 2002 CITEL Technologies Ltd.

+ *   All rights reserved.

+ *

+ * 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. 

+ * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors 

+ *    may be used to endorse or promote products derived from this software 

+ *    without specific prior written permission. 

+ *

+ * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES 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 CITEL TECHNOLOGIES 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. 

+ *

+ ****************************************************************************/

+

+/****************************************************************************

+ * Included Files

+ ****************************************************************************/

+

+#include <nuttx/config.h>

+

+#include <wdog.h>

+#include <assert.h>

+#include <debug.h>

+

+#include <net/uip/uipopt.h>

+#include <net/uip/uip.h>

+#include <net/uip/uip-igmp.h>

+

+#include "uip_internal.h"

+

+#ifdef CONFIG_NET_IGMP

+

+/****************************************************************************

+ * Pre-processor Definitions

+ ****************************************************************************/

+

+#define IGMPBUF     ((struct uip_igmphdr_s *)&dev->d_buf[UIP_LLH_LEN])

+

+/****************************************************************************

+ * Private Functions

+ ****************************************************************************/

+

+/****************************************************************************

+ * Public Functions

+ ****************************************************************************/

+

+/****************************************************************************

+ * Name:  uip_igmpinput

+ *

+ * Description:

+ *   An IGMP packet has been received.

+ *

+ *                              ________________

+ *                             |                |

+ *                             |                |

+ *                             |                |

+ *                             |                |

+ *                  +--------->|   Non-Member   |<---------+

+ *                  |          |                |          |

+ *                  |          |                |          |

+ *                  |          |                |          |

+ *                  |          |________________|          |

+ *                  |                   |                  |

+ *                  | leave group       | join group       | leave group

+ *                  | (stop timer,      |(send report,     | (send leave

+ *                  |  send leave if    | set flag,        |  if flag set)

+ *                  |  flag set)        | start timer)     |

+ *          ________|________           |          ________|________

+ *         |                 |<---------+         |                 |

+ *         |                 |                    |                 |

+ *         |                 |<-------------------|                 |

+ *         |                 |   query received   |                 |

+ *         | Delaying Member |    (start timer)   |   Idle Member   |

+ *   +---->|                 |------------------->|                 |

+ *   |     |                 |   report received  |                 |

+ *   |     |                 |    (stop timer,    |                 |

+ *   |     |                 |     clear flag)    |                 |

+ *   |     |_________________|------------------->|_________________|

+ *   | query received    |        timer expired

+ *   | (reset timer if   |        (send report,

+ *   |  Max Resp Time    |         set flag)

+ *   |  < current timer) |

+ *   +-------------------+

+ *

+ * NOTE: This is most likely executing from an interrupt handler.

+ *

+ ****************************************************************************/

+

+void uip_igmpinput(struct uip_driver_s *dev)

+{

+  FAR struct igmp_group_s *group;

+  uip_ipaddr_t destipaddr;

+  uip_ipaddr_t grpaddr;

+  unsigned int ticks;

+

+  nvdbg("IGMP message: %04x%04x\n", IGMPBUF->destipaddr[1], IGMPBUF->destipaddr[0]);

+

+  /* Verify the message length */

+

+  if (dev->d_len < UIP_LLH_LEN+UIP_IPIGMPH_LEN)

+    {

+      IGMP_STATINCR(uip_stat.igmp.length_errors);

+      ndbg("Length error\n");

+      return;

+    }

+

+  /* Calculate and check the IGMP checksum */

+

+  if (uip_chksum((uint16_t*)&IGMPBUF->type, UIP_IGMPH_LEN) != 0)

+    {

+      IGMP_STATINCR(uip_stat.igmp.chksum_errors);

+      ndbg("Checksum error\n");

+      return;

+    }

+

+  /* Find the group (or create a new one) using the incoming IP address*/

+

+  destipaddr = uip_ip4addr_conv(IGMPBUF->destipaddr);

+  group = uip_grpallocfind(dev, &destipaddr);

+

+  /* Now handle the message based on the IGMP message type */

+

+  switch (IGMPBUF->type)

+    {

+      case IGMP_MEMBERSHIP_QUERY:

+        /* RFC 2236, 2.2.  ax Response Time

+         *  "The Max Response Time field is meaningful only in Membership Query

+         *   messages, and specifies the maximum allowed time before sending a

+         *   responding report in units of 1/10 second.  In all other messages, it

+         *   is set to zero by the sender and ignored by receivers.

+         */

+

+        /* Check if the query was sent to all systems */

+

+        if (uip_ipaddr_cmp(destipaddr, g_allsystems))

+          {

+            /* Yes... Now check the if this this is a general or a group

+             * specific query.

+             *

+             * RFC 2236, 2.1.  Type

+             * There are two sub-types of Membership Query messages:

+             * - General Query, used to learn which groups have members on an

+             *   attached network.

+             * - Group-Specific Query, used to learn if a particular group

+             *   has any members on an attached network.

+             *

+             * RFC 2236, 2.4. Group Address

+             *   "In a Membership Query message, the group address field is

+             *    set to zero when sending a General Query, and set to the

+             *    group address being queried when sending a Group-Specific

+             *    Query."

+             */

+

+            if (IGMPBUF->grpaddr == 0)

+              {

+                FAR struct igmp_group_s *member;

+

+                /* This is the general query */

+

+                nvdbg("General multicast query\n");

+                if (IGMPBUF->maxresp == 0)

+                  {

+                    IGMP_STATINCR(uip_stat.igmp.v1_received);

+                    IGMPBUF->maxresp = 10;

+

+                    ndbg("V1 not implemented\n");

+                  }

+

+                IGMP_STATINCR(uip_stat.igmp.query_received);

+                for (member = (FAR struct igmp_group_s *)dev->grplist.head;

+                     member;

+                     member = member->next)

+                  {

+                    /* Skip over the all systems group entry */

+

+                    if (!uip_ipaddr_cmp(member->grpaddr, g_allsystems))

+                      {

+                        ticks = uip_decisec2tick((int)IGMPBUF->maxresp);

+                        if (IS_IDLEMEMBER(member->flags) ||

+                            uip_igmpcmptimer(member, ticks))

+                          {

+                            uip_igmpstartticks(member, ticks);

+                            CLR_IDLEMEMBER(member->flags);

+                          }

+                      }

+                  }

+              }

+            else /* if (group->grpaddr != 0) */

+              {

+                nvdbg("Group-specific multicast queury\n");

+

+                /* We first need to re-lookup the group since we used dest last time.

+                 * Use the incoming IPaddress!

+                 */

+

+                IGMP_STATINCR(uip_stat.igmp.ucast_query);

+                grpaddr = uip_ip4addr_conv(IGMPBUF->grpaddr);

+                group   = uip_grpallocfind(dev, &grpaddr);

+                ticks   = uip_decisec2tick((int)IGMPBUF->maxresp);

+                if (IS_IDLEMEMBER(group->flags) || uip_igmpcmptimer(group, ticks))

+                  {

+                    uip_igmpstartticks(group, ticks);

+                    CLR_IDLEMEMBER(group->flags);

+                  }

+              }

+          }

+

+        /* Not sent to all systems -- Unicast query */

+

+        else if (group->grpaddr != 0)

+          {

+            nvdbg("Unitcast queury\n");

+            IGMP_STATINCR(uip_stat.igmp.ucast_query);

+

+            ndbg("Query to a specific group with the group address as destination\n");

+

+            ticks = uip_decisec2tick((int)IGMPBUF->maxresp);

+            if (IS_IDLEMEMBER(group->flags) || uip_igmpcmptimer(group, ticks))

+              {

+                uip_igmpstartticks(group, ticks);

+                CLR_IDLEMEMBER(group->flags);

+              }

+          }

+        break;

+

+      case IGMPv2_MEMBERSHIP_REPORT:

+        {

+          nvdbg("Membership report\n");

+

+          IGMP_STATINCR(uip_stat.igmp.report_received);

+          if (!IS_IDLEMEMBER(group->flags))

+            {

+              /* This is on a specific group we have already looked up */

+

+              wd_cancel(group->wdog);

+              SET_IDLEMEMBER(group->flags);

+              CLR_LASTREPORT(group->flags);

+            }

+        }

+      break;

+

+      default:

+        {

+          nvdbg("Unexpected msg %02x in state %d on group %p at dev %p\n",

+                IGMPBUF->type, group->state, &group, dev);

+        }

+      break;

+    }

+}

+

+#endif /* CONFIG_NET_IGMP */