1 files changed, 120 insertions, 0 deletions
diff --git a/usr.sbin/eigrpd/reply.c b/usr.sbin/eigrpd/reply.c
new file mode 100644
index 00000000000..98dab8d54cf
--- /dev/null
+++ b/usr.sbin/eigrpd/reply.c
@@ -0,0 +1,120 @@
+/*	$OpenBSD: reply.c,v 1.1 2015/10/02 04:26:47 renato Exp $ */
+
+/*
+ * Copyright (c) 2015 Renato Westphal <renato@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <netinet/in.h>
+#include <netinet/ip6.h>
+
+#include "eigrpd.h"
+#include "eigrp.h"
+#include "log.h"
+#include "eigrpe.h"
+
+extern struct eigrpd_conf	*econf;
+
+/* reply packet handling */
+
+void
+send_reply(struct nbr *nbr, struct rinfo_head *rinfo_list, int siareply)
+{
+	struct eigrp		*eigrp = nbr->ei->eigrp;
+	struct ibuf		*buf;
+	uint16_t		 opcode;
+	struct rinfo_entry	*re;
+	int			 size;
+	int			 route_len;
+
+	if (rinfo_list == NULL || TAILQ_EMPTY(rinfo_list))
+		return;
+
+	/* don't exceed the interface's mtu */
+	do {
+		if ((buf = ibuf_dynamic(PKG_DEF_SIZE,
+		    IP_MAXPACKET - sizeof(struct ip))) == NULL)
+			fatal("send_reply");
+
+		if (!siareply)
+			 opcode = EIGRP_OPC_REPLY;
+		else
+			 opcode = EIGRP_OPC_SIAREPLY;
+
+		/* EIGRP header */
+		if (gen_eigrp_hdr(buf, opcode, 0, eigrp->seq_num, eigrp->as))
+			goto fail;
+
+		switch (eigrp->af) {
+		case AF_INET:
+			size = sizeof(struct ip);
+			break;
+		case AF_INET6:
+			size = sizeof(struct ip6_hdr);
+			break;
+		default:
+			break;
+		}
+		size += sizeof(struct eigrp_hdr);
+
+		while ((re = TAILQ_FIRST(rinfo_list)) != NULL) {
+			route_len = len_route_tlv(&re->rinfo);
+			if (size + route_len > nbr->ei->iface->mtu) {
+				rtp_send_ucast(nbr, buf);
+				break;
+			}
+			size += route_len;
+
+			if (gen_route_tlv(buf, &re->rinfo))
+				goto fail;
+			TAILQ_REMOVE(rinfo_list, re, entry);
+			free(re);
+		}
+	} while (!TAILQ_EMPTY(rinfo_list));
+
+	/* reply packets are always unicast */
+	rtp_send_ucast(nbr, buf);
+	return;
+fail:
+	log_warnx("%s: failed to send message", __func__);
+	if (rinfo_list)
+		message_list_clr(rinfo_list);
+	ibuf_free(buf);
+	return;
+}
+
+void
+recv_reply(struct nbr *nbr, struct rinfo_head *rinfo_list, int siareply)
+{
+	int			 type;
+	struct rinfo_entry	*re;
+
+	/*
+	 * draft-savage-eigrp-02 - Section 4.3:
+	 * "When a REPLY packet is received, there is no reason to process
+	 * the packet before an acknowledgment is sent. Therefore, an Ack
+	 * packet is sent immediately and then the packet is processed."
+	 */
+	rtp_send_ack(nbr);
+
+	if (!siareply)
+		type = IMSG_RECV_REPLY;
+	else
+		type = IMSG_RECV_SIAREPLY;
+
+	TAILQ_FOREACH(re, rinfo_list, entry)
+		eigrpe_imsg_compose_rde(type, nbr->peerid, 0, &re->rinfo,
+		    sizeof(re->rinfo));
+}