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/* $OpenBSD: hello.c,v 1.12 2011/03/12 01:57:13 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"
int tlv_decode_hello_prms(char *, u_int16_t, u_int16_t *, 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 ibuf *, u_int16_t);
int
send_hello(struct iface *iface)
{
struct sockaddr_in dst;
struct ibuf *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 = ibuf_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);
ibuf_free(buf);
return (0);
}
void
recv_hello(struct iface *iface, struct in_addr src, char *buf, u_int16_t len)
{
struct ldp_msg hello;
struct ldp_hdr ldp;
struct nbr *nbr = NULL;
struct in_addr address;
u_int32_t conf_number;
u_int16_t holdtime, flags;
int r;
bcopy(buf, &ldp, sizeof(ldp));
buf += LDP_HDR_SIZE;
len -= LDP_HDR_SIZE;
bcopy(buf, &hello, sizeof(hello));
buf += sizeof(struct ldp_msg);
len -= sizeof(struct ldp_msg);
r = tlv_decode_hello_prms(buf, len, &holdtime, &flags);
if (r == -1) {
address.s_addr = ldp.lsr_id;
log_debug("recv_hello: neighbor %s: failed to decode params",
inet_ntoa(address));
return;
}
buf += r;
len -= r;
r = tlv_decode_opt_hello_prms(buf, len, &address, &conf_number);
if (r == -1) {
address.s_addr = ldp.lsr_id;
log_debug("recv_hello: neighbor %s: failed to decode "
"optional params", inet_ntoa(address));
return;
}
if (r != len) {
address.s_addr = ldp.lsr_id;
log_debug("recv_hello: neighbor %s: unexpected data in message",
inet_ntoa(address));
return;
}
nbr = nbr_find_ldpid(ldp.lsr_id, ldp.lspace_id);
if (!nbr) {
struct in_addr a;
if (address.s_addr == INADDR_ANY)
a = src;
else
a = address;
nbr = nbr_new(ldp.lsr_id, ldp.lspace_id, iface, a);
/* set neighbor parameters */
nbr->hello_type = flags;
if (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 (holdtime == INFINITE_HOLDTIME) {
/* No timeout for this neighbor */
nbr->holdtime = iface->holdtime;
} else {
if (iface->holdtime < holdtime)
nbr->holdtime = iface->holdtime;
else
nbr->holdtime = 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 ibuf *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.flags = 0;
return (ibuf_add(buf, &parms, sizeof(parms)));
}
int
tlv_decode_hello_prms(char *buf, u_int16_t len, u_int16_t *holdtime,
u_int16_t *flags)
{
struct hello_prms_tlv tlv;
if (len < sizeof(tlv))
return (-1);
bcopy(buf, &tlv, sizeof(tlv));
if (ntohs(tlv.length) != sizeof(tlv) - TLV_HDR_LEN)
return (-1);
if (tlv.type != htons(TLV_TYPE_COMMONHELLO))
return (-1);
*holdtime = ntohs(tlv.holdtime);
*flags = ntohs(tlv.flags);
return (sizeof(tlv));
}
int
tlv_decode_opt_hello_prms(char *buf, u_int16_t len, struct in_addr *addr,
u_int32_t *conf_number)
{
struct tlv tlv;
int cons = 0;
u_int16_t tlv_len;
bzero(addr, sizeof(*addr));
*conf_number = 0;
while (len >= sizeof(tlv)) {
bcopy(buf, &tlv, sizeof(tlv));
tlv_len = ntohs(tlv.length);
switch (ntohs(tlv.type)) {
case TLV_TYPE_IPV4TRANSADDR:
if (tlv_len != sizeof(u_int32_t))
return (-1);
bcopy(buf + TLV_HDR_LEN, addr, sizeof(u_int32_t));
break;
case TLV_TYPE_CONFIG:
if (tlv_len != sizeof(u_int32_t))
return (-1);
bcopy(buf + TLV_HDR_LEN, conf_number,
sizeof(u_int32_t));
break;
default:
/* if unknown flag set, ignore TLV */
if (!(ntohs(tlv.type) & UNKNOWN_FLAG))
return (-1);
break;
}
buf += TLV_HDR_LEN + tlv_len;
len -= TLV_HDR_LEN + tlv_len;
cons += TLV_HDR_LEN + tlv_len;
}
return (cons);
}
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