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/* $OpenBSD: hello.c,v 1.5 2010/05/19 15:28:51 claudio Exp $ */
/*
* Copyright (c) 2009 Michele Marchetto <michele@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 <sys/socket.h>
#include <sys/uio.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <net/if_dl.h>
#include <errno.h>
#include <event.h>
#include <stdlib.h>
#include <string.h>
#include "ldpd.h"
#include "ldp.h"
#include "log.h"
#include "ldpe.h"
struct hello_prms_tlv *tlv_decode_hello_prms(char *, u_int16_t);
int tlv_decode_opt_hello_prms(char *, u_int16_t,
struct in_addr *, u_int32_t *);
int gen_hello_prms_tlv(struct iface *, struct buf *,
u_int16_t);
int
send_hello(struct iface *iface)
{
struct sockaddr_in dst;
struct buf *buf;
u_int16_t size;
dst.sin_port = htons(LDP_PORT);
dst.sin_family = AF_INET;
dst.sin_len = sizeof(struct sockaddr_in);
inet_aton(AllRouters, &dst.sin_addr);
if (iface->passive)
return (0);
if ((buf = buf_open(LDP_MAX_LEN)) == NULL)
fatal("send_hello");
size = LDP_HDR_SIZE + sizeof(struct ldp_msg) +
sizeof(struct hello_prms_tlv);
gen_ldp_hdr(buf, iface, size);
size -= LDP_HDR_SIZE;
gen_msg_tlv(buf, MSG_TYPE_HELLO, size);
size -= sizeof(struct ldp_msg);
gen_hello_prms_tlv(iface, buf, size);
send_packet(iface, buf->buf, buf->wpos, &dst);
buf_free(buf);
return (0);
}
void
recv_hello(struct iface *iface, struct in_addr src, char *buf, u_int16_t len)
{
struct ldp_msg *hello;
u_int32_t messageid;
struct nbr *nbr = NULL;
struct hello_prms_tlv *cpt;
struct ldp_hdr *ldp;
struct in_addr address;
u_int32_t conf_number;
ldp = (struct ldp_hdr *)buf;
buf += LDP_HDR_SIZE;
len -= LDP_HDR_SIZE;
hello = (struct ldp_msg *)buf;
if ((len - TLV_HDR_LEN) < ntohs(hello->length))
return;
messageid = hello->msgid;
buf += sizeof(struct ldp_msg);
len -= sizeof(struct ldp_msg);
cpt = tlv_decode_hello_prms(buf, len);
if (cpt == NULL)
return;
buf += sizeof(struct hello_prms_tlv);
len -= sizeof(struct hello_prms_tlv);
tlv_decode_opt_hello_prms(buf, len, &address, &conf_number);
nbr = nbr_find_ldpid(iface, ldp->lsr_id, ldp->lspace_id);
if (!nbr) {
nbr = nbr_new(ldp->lsr_id, ldp->lspace_id, iface);
/* set neighbor parameters */
if (address.s_addr == INADDR_ANY)
nbr->addr.s_addr = src.s_addr;
else
nbr->addr.s_addr = address.s_addr;
nbr->hello_type = cpt->reserved;
if (cpt->holdtime == 0) {
/* XXX: lacks support for targeted hellos */
if (iface->holdtime < LINK_DFLT_HOLDTIME)
nbr->holdtime = iface->holdtime;
else
nbr->holdtime = LINK_DFLT_HOLDTIME;
} else if (cpt->holdtime == INFINITE_HOLDTIME) {
/* No timeout for this neighbor */
nbr->holdtime = iface->holdtime;
} else {
if (iface->holdtime < ntohs(cpt->holdtime))
nbr->holdtime = iface->holdtime;
else
nbr->holdtime = ntohs(cpt->holdtime);
}
}
nbr_fsm(nbr, NBR_EVT_HELLO_RCVD);
if (ntohl(nbr->addr.s_addr) < ntohl(nbr->iface->addr.s_addr) &&
nbr->state == NBR_STA_PRESENT && !nbr_pending_idtimer(nbr))
nbr_act_session_establish(nbr, 1);
}
int
gen_hello_prms_tlv(struct iface *iface, struct buf *buf, u_int16_t size)
{
struct hello_prms_tlv parms;
/* We want just the size of the value */
size -= TLV_HDR_LEN;
bzero(&parms, sizeof(parms));
parms.type = htons(TLV_TYPE_COMMONHELLO);
parms.length = htons(size);
/* XXX */
parms.holdtime = htons(iface->holdtime);
parms.reserved = 0;
return (buf_add(buf, &parms, sizeof(parms)));
}
struct hello_prms_tlv *
tlv_decode_hello_prms(char *buf, u_int16_t len)
{
struct hello_prms_tlv *tlv;
tlv = (struct hello_prms_tlv *)buf;
if (len < sizeof(*tlv) || ntohs(tlv->length) !=
(sizeof(tlv->holdtime) + sizeof(tlv->reserved)))
return (NULL);
if ((tlv->type & ~UNKNOWN_FLAGS_MASK) != htons(TLV_TYPE_COMMONHELLO))
return (NULL);
if ((tlv->type & UNKNOWN_FLAGS_MASK) != 0)
return (NULL);
return (tlv);
}
int
tlv_decode_opt_hello_prms(char *buf, u_int16_t len, struct in_addr *addr,
u_int32_t *conf_number)
{
struct hello_opt_parms_tlv *tlv;
bzero(addr, sizeof(*addr));
*conf_number = 0;
while (len >= sizeof(*tlv)) {
tlv = (struct hello_opt_parms_tlv *)buf;
if (tlv->length < sizeof(u_int32_t))
return (-1);
switch (ntohs(tlv->type)) {
case TLV_TYPE_IPV4TRANSADDR:
addr->s_addr = tlv->value;
break;
case TLV_TYPE_CONFIG:
*conf_number = ntohl(tlv->value);
break;
default:
return (-1);
}
len -= sizeof(*tlv);
buf += sizeof(*tlv);
}
return (0);
}
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