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      1 /* $NetBSD: pdu.c,v 1.5 2013/07/11 05:45:23 kefren Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2010 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Mihai Chelaru <kefren (at) NetBSD.org>
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <arpa/inet.h>
     33 
     34 #include <stdio.h>
     35 #include <strings.h>
     36 #include <stdlib.h>
     37 
     38 #include "socketops.h"
     39 #include "ldp_errors.h"
     40 #include "ldp.h"
     41 #include "ldp_peer.h"
     42 #include "notifications.h"
     43 #include "pdu.h"
     44 
     45 uint
     46 get_pdu(const unsigned char *s, struct ldp_pdu * p)
     47 {
     48 	const struct ldp_pdu *p1 = (const struct ldp_pdu *) s;
     49 
     50 	p->version = ntohs(p1->version);
     51 	p->length = ntohs(p1->length);
     52 	memcpy(&p->ldp_id, &p1->ldp_id, sizeof(struct in_addr));
     53 	p->label_space = ntohs(p1->label_space);
     54 
     55 	return MIN_PDU_SIZE;
     56 }
     57 
     58 /* Checks an incoming PDU for size and version */
     59 int
     60 check_recv_pdu(const struct ldp_peer * p, const struct ldp_pdu * rpdu, int c)
     61 {
     62 	struct notification_tlv *notiftlv;
     63 
     64 	/* Avoid underflow */
     65 	if (c < MIN_PDU_SIZE)
     66 		return LDP_E_BAD_LENGTH;
     67 
     68 	if (p->ldp_id.s_addr != rpdu->ldp_id.s_addr) {
     69 		fatalp("Invalid LDP ID %s received from ",
     70 		    inet_ntoa(rpdu->ldp_id));
     71 		fatalp("%s\n", inet_ntoa(p->ldp_id));
     72 		notiftlv = build_notification(0,
     73 		    NOTIF_FATAL | NOTIF_BAD_LDP_ID);
     74 		send_tlv(p, (struct tlv *) notiftlv);
     75 		free(notiftlv);
     76 		return LDP_E_BAD_ID;
     77 	}
     78 
     79 	/* Check PDU for right LDP version */
     80 	if (ntohs(rpdu->version) != LDP_VERSION) {
     81 		fatalp("Invalid PDU version received from %s (%d)\n",
     82 		       satos(p->address), ntohs(rpdu->version));
     83 		notiftlv = build_notification(0,
     84 		    NOTIF_FATAL | NOTIF_BAD_LDP_VER);
     85 		send_tlv(p, (struct tlv *) notiftlv);
     86 		free(notiftlv);
     87 		return LDP_E_BAD_VERSION;
     88 	}
     89 	/* Check PDU for length validity */
     90 	if (ntohs(rpdu->length) > c - PDU_VER_LENGTH) {
     91 		fatalp("Invalid PDU length received from %s (announced %d, "
     92 		    "received %d)\n", satos(p->address),
     93 		    ntohs(rpdu->length), (int) (c - PDU_VER_LENGTH));
     94 		notiftlv = build_notification(0,
     95 		    NOTIF_FATAL | NOTIF_BAD_PDU_LEN);
     96 		send_tlv(p, (struct tlv *) notiftlv);
     97 		free(notiftlv);
     98 		return LDP_E_BAD_LENGTH;
     99 	}
    100 	return LDP_E_OK;
    101 }
    102