eigrp: Initial Commit

Please Note, I will be redoing this commit message with
more information.

Additionally I will rework the lib/* changes into their
own commits.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>

1 files changed, 249 insertions, 0 deletions

diff --git a/eigrpd/eigrp_reply.c b/eigrpd/eigrp_reply.c
new file mode 100644
index 000000000..ff40e2e5c
--- /dev/null
+++ b/eigrpd/eigrp_reply.c
@@ -0,0 +1,249 @@
+/*
+ * EIGRP Sending and Receiving EIGRP Reply Packets.
+ * Copyright (C) 2013-2016
+ * Authors:
+ *   Donnie Savage
+ *   Jan Janovic
+ *   Matej Perina
+ *   Peter Orsag
+ *   Peter Paluch
+ *   Frantisek Gazo
+ *   Tomas Hvorkovy
+ *   Martin Kontsek
+ *   Lukas Koribsky
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * GNU Zebra is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Zebra; see the file COPYING.  If not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#include <zebra.h>
+
+#include "thread.h"
+#include "memory.h"
+#include "linklist.h"
+#include "prefix.h"
+#include "if.h"
+#include "table.h"
+#include "sockunion.h"
+#include "stream.h"
+#include "log.h"
+#include "sockopt.h"
+#include "checksum.h"
+#include "md5.h"
+#include "vty.h"
+#include "keychain.h"
+#include "plist.h"
+
+#include "eigrpd/eigrp_structs.h"
+#include "eigrpd/eigrpd.h"
+#include "eigrpd/eigrp_interface.h"
+#include "eigrpd/eigrp_neighbor.h"
+#include "eigrpd/eigrp_packet.h"
+#include "eigrpd/eigrp_zebra.h"
+#include "eigrpd/eigrp_vty.h"
+#include "eigrpd/eigrp_dump.h"
+#include "eigrpd/eigrp_macros.h"
+#include "eigrpd/eigrp_topology.h"
+#include "eigrpd/eigrp_fsm.h"
+#include "eigrpd/eigrp_memory.h"
+
+void
+eigrp_send_reply (struct eigrp_neighbor *nbr, struct eigrp_prefix_entry *pe)
+{
+  struct eigrp_packet *ep;
+  u_int16_t length = EIGRP_HEADER_LEN;
+
+  struct access_list *alist;
+  struct prefix_list *plist;
+  struct access_list *alist_i;
+  struct prefix_list *plist_i;
+  struct eigrp *e;
+  struct eigrp_prefix_entry *pe2;
+
+  //TODO: Work in progress
+  /* Filtering */
+  /* get list from eigrp process */
+  e = eigrp_lookup();
+  pe2 = XCALLOC(MTYPE_EIGRP_PREFIX_ENTRY, sizeof(struct eigrp_prefix_entry));
+  memcpy(pe2,pe,sizeof(struct eigrp_prefix_entry));
+  /* Get access-lists and prefix-lists from process and interface */
+  alist = e->list[EIGRP_FILTER_OUT];
+  plist = e->prefix[EIGRP_FILTER_OUT];
+  alist_i = nbr->ei->list[EIGRP_FILTER_OUT];
+  plist_i = nbr->ei->prefix[EIGRP_FILTER_OUT];
+  zlog_info("REPLY Send: Filtering");
+
+  zlog_info("REPLY SEND Prefix: %s", inet_ntoa(nbr->src));
+  /* Check if any list fits */
+  if ((alist && access_list_apply (alist, (struct prefix *) pe2->destination_ipv4) == FILTER_DENY)||
+	  (plist && prefix_list_apply (plist, (struct prefix *) pe2->destination_ipv4) == FILTER_DENY)||
+	  (alist_i && access_list_apply (alist_i, (struct prefix *) pe2->destination_ipv4) == FILTER_DENY)||
+	  (plist_i && prefix_list_apply (plist_i, (struct prefix *) pe2->destination_ipv4) == FILTER_DENY))
+  {
+    zlog_info("REPLY SEND: Setting Metric to max");
+    pe2->reported_metric.delay = EIGRP_MAX_METRIC;
+
+  } else {
+    zlog_info("REPLY SEND: Not setting metric");
+  }
+
+
+  /*
+   * End of filtering
+   */
+
+  ep = eigrp_packet_new(nbr->ei->ifp->mtu);
+
+  /* Prepare EIGRP INIT UPDATE header */
+  eigrp_packet_header_init(EIGRP_OPC_REPLY, nbr->ei, ep->s, 0,
+                           nbr->ei->eigrp->sequence_number, 0);
+
+  // encode Authentication TLV, if needed
+  if((IF_DEF_PARAMS (nbr->ei->ifp)->auth_type == EIGRP_AUTH_TYPE_MD5) && (IF_DEF_PARAMS (nbr->ei->ifp)->auth_keychain != NULL))
+    {
+      length += eigrp_add_authTLV_MD5_to_stream(ep->s,nbr->ei);
+    }
+
+
+  length += eigrp_add_internalTLV_to_stream(ep->s, pe2);
+
+  if((IF_DEF_PARAMS (nbr->ei->ifp)->auth_type == EIGRP_AUTH_TYPE_MD5) && (IF_DEF_PARAMS (nbr->ei->ifp)->auth_keychain != NULL))
+    {
+      eigrp_make_md5_digest(nbr->ei,ep->s, EIGRP_AUTH_UPDATE_FLAG);
+    }
+
+  /* EIGRP Checksum */
+  eigrp_packet_checksum(nbr->ei, ep->s, length);
+
+  ep->length = length;
+  ep->dst.s_addr = nbr->src.s_addr;
+
+  /*This ack number we await from neighbor*/
+  ep->sequence_number = nbr->ei->eigrp->sequence_number;
+
+  /*Put packet to retransmission queue*/
+  eigrp_fifo_push_head(nbr->retrans_queue, ep);
+
+  if (nbr->retrans_queue->count == 1)
+    {
+      eigrp_send_packet_reliably(nbr);
+    }
+}
+
+/*EIGRP REPLY read function*/
+void
+eigrp_reply_receive (struct eigrp *eigrp, struct ip *iph, struct eigrp_header *eigrph,
+                     struct stream * s, struct eigrp_interface *ei, int size)
+{
+  struct eigrp_neighbor *nbr;
+  struct TLV_IPv4_Internal_type *tlv;
+
+  struct access_list *alist;
+  struct prefix_list *plist;
+  struct access_list *alist_i;
+  struct prefix_list *plist_i;
+  struct eigrp *e;
+
+  u_int16_t type;
+
+  /* increment statistics. */
+  ei->reply_in++;
+
+  /* get neighbor struct */
+  nbr = eigrp_nbr_get(ei, eigrph, iph);
+
+  /* neighbor must be valid, eigrp_nbr_get creates if none existed */
+  assert(nbr);
+
+  nbr->recv_sequence_number = ntohl(eigrph->sequence);
+
+  while (s->endp > s->getp)
+    {
+      type = stream_getw(s);
+      if (type == EIGRP_TLV_IPv4_INT)
+        {
+          stream_set_getp(s, s->getp - sizeof(u_int16_t));
+
+          tlv = eigrp_read_ipv4_tlv(s);
+
+          struct prefix_ipv4 *dest_addr;
+          dest_addr = prefix_ipv4_new();
+          dest_addr->prefix = tlv->destination;
+          dest_addr->prefixlen = tlv->prefix_length;
+          struct eigrp_prefix_entry *dest = eigrp_topology_table_lookup_ipv4(
+              eigrp->topology_table, dest_addr);
+          /*
+           * Destination must exists
+           */
+          assert(dest);
+
+          struct eigrp_fsm_action_message *msg;
+          msg = XCALLOC(MTYPE_EIGRP_FSM_MSG,
+              sizeof(struct eigrp_fsm_action_message));
+          struct eigrp_neighbor_entry *entry = eigrp_prefix_entry_lookup(
+              dest->entries, nbr);
+
+          /*
+           * Filtering
+           */
+          //TODO: Work in progress
+          /* get list from eigrp process */
+          e = eigrp_lookup();
+          /* Get access-lists and prefix-lists from process and interface */
+          alist = e->list[EIGRP_FILTER_IN];
+          plist = e->prefix[EIGRP_FILTER_IN];
+          alist_i = ei->list[EIGRP_FILTER_IN];
+          plist_i = ei->prefix[EIGRP_FILTER_IN];
+          zlog_info("REPLY Receive: Filtering");
+          zlog_info("REPLY RECEIVE Prefix: %s", inet_ntoa(dest_addr->prefix));
+		  /* Check if any list fits */
+		  if ((alist && access_list_apply (alist,
+					 (struct prefix *) dest_addr) == FILTER_DENY)||
+				  (plist && prefix_list_apply (plist,
+							(struct prefix *) dest_addr) == FILTER_DENY)||
+				  (alist_i && access_list_apply (alist_i,
+							(struct prefix *) dest_addr) == FILTER_DENY)||
+				  (plist_i && prefix_list_apply (plist_i,
+							(struct prefix *) dest_addr) == FILTER_DENY))
+		  {
+			  zlog_info("REPLY RECEIVE: Setting metric to max");
+			  tlv->metric.delay = EIGRP_MAX_METRIC;
+			  zlog_info("REPLY RECEIVE Prefix: %s", inet_ntoa(dest_addr->prefix));
+		  } else {
+			  zlog_info("REPLY RECEIVE: Not setting metric");
+		  }
+		  /*
+		   * End of filtering
+		   */
+
+		  msg->packet_type = EIGRP_OPC_REPLY;
+		  msg->eigrp = eigrp;
+		  msg->data_type = EIGRP_TLV_IPv4_INT;
+		  msg->adv_router = nbr;
+		  msg->data.ipv4_int_type = tlv;
+		  msg->entry = entry;
+		  msg->prefix = dest;
+		  int event = eigrp_get_fsm_event(msg);
+		  eigrp_fsm_event(msg, event);
+
+
+          eigrp_IPv4_InternalTLV_free (tlv);
+        }
+    }
+  eigrp_hello_send_ack(nbr);
+}
+