IABSD.fr/src/usr.sbin/eigrpd/reply.c

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• Author : renato
  Date : 2016-09-02 16:46:29
  Hash : a7928e1e
  Message : Minor tweaks

• usr.sbin/eigrpd/reply.c

• /*	$OpenBSD: reply.c,v 1.5 2016/09/02 16:46:29 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 <sys/types.h>
  #include <netinet/in.h>
  #include <netinet/ip.h>
  #include <netinet/ip6.h>
  
  #include <stdlib.h>
  
  #include "eigrpd.h"
  #include "eigrpe.h"
  #include "log.h"
  
  /* 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;
  
  	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:
  			fatalx("send_reply: unknown af");
  		}
  		size += sizeof(struct eigrp_hdr);
  
  		while ((re = TAILQ_FIRST(rinfo_list)) != NULL) {
  			route_len = len_route_tlv(&re->rinfo);
  			/* don't exceed the MTU to avoid IP fragmentation */
  			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));
  }