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/* $OpenBSD: address.c,v 1.4 2010/02/25 17:40:46 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 <unistd.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"
extern struct ldpd_conf *leconf;
void gen_address_list_tlv(struct buf *, struct iface *, u_int16_t);
void
send_address(struct nbr *nbr, struct iface *iface)
{
struct buf *buf;
struct iface *niface;
u_int16_t size, iface_count = 0;
if (nbr->iface->passive)
return;
log_debug("send_address: neighbor ID %s", inet_ntoa(nbr->id));
if ((buf = buf_open(LDP_MAX_LEN)) == NULL)
fatal("send_address");
/* XXX: multiple address on the same iface? */
if (iface == NULL)
LIST_FOREACH(niface, &leconf->iface_list, entry)
iface_count++;
else
iface_count = 1;
size = LDP_HDR_SIZE + sizeof(struct ldp_msg) +
sizeof(struct address_list_tlv) +
iface_count * sizeof(struct in_addr);
gen_ldp_hdr(buf, nbr->iface, size);
size -= LDP_HDR_SIZE;
gen_msg_tlv(buf, MSG_TYPE_ADDR, size);
size -= sizeof(struct ldp_msg);
gen_address_list_tlv(buf, iface, size);
evbuf_enqueue(&nbr->wbuf, buf);
}
int
recv_address(struct nbr *nbr, char *buf, u_int16_t len)
{
struct ldp_msg *addr;
struct address_list_tlv *alt;
struct in_addr *address;
u_int32_t addrs_len;
log_debug("recv_address: neighbor ID %s", inet_ntoa(nbr->id));
if (nbr->state != NBR_STA_OPER)
return (-1);
addr = (struct ldp_msg *)buf;
if ((len - TLV_HDR_LEN) < ntohs(addr->length)) {
session_shutdown(nbr, S_BAD_MSG_LEN, addr->msgid, addr->type);
return (-1);
}
buf += sizeof(struct ldp_msg);
len -= sizeof(struct ldp_msg);
alt = (struct address_list_tlv *)buf;
if (len < sizeof(*alt) ||
(len - TLV_HDR_LEN) < ntohs(alt->length)) {
session_shutdown(nbr, S_BAD_TLV_LEN, addr->msgid, addr->type);
return (-1);
}
addrs_len = (ntohs(alt->length) - sizeof(alt->family));
if (alt->type != TLV_TYPE_ADDRLIST) {
session_shutdown(nbr, S_UNKNOWN_TLV, addr->msgid, addr->type);
return (-1);
}
/* For now we only support IPv4 */
if (alt->family != htons(ADDR_IPV4)) {
send_notification_nbr(nbr, S_UNSUP_ADDR, addr->msgid,
addr->type);
return (-1);
}
buf += sizeof(*alt);
len -= sizeof(*alt);
address = (struct in_addr *)buf;
while (addrs_len >= sizeof(address)) {
ldpe_imsg_compose_lde(IMSG_ADDRESS_ADD, nbr->peerid, 0,
address, sizeof(*address));
address++;
addrs_len -= sizeof(*address);
}
return (ntohs(addr->length));
}
void
gen_address_list_tlv(struct buf *buf, struct iface *iface, u_int16_t size)
{
struct address_list_tlv alt;
struct iface *niface;
/* We want just the size of the value */
size -= TLV_HDR_LEN;
bzero(&alt, sizeof(alt));
alt.type = TLV_TYPE_ADDRLIST;
alt.length = htons(size);
/* XXX: just ipv4 for now */
alt.family = htons(ADDR_IPV4);
buf_add(buf, &alt, sizeof(alt));
if (iface == NULL)
LIST_FOREACH(niface, &leconf->iface_list, entry)
buf_add(buf, &niface->addr, sizeof(niface->addr));
else
buf_add(buf, &iface->addr, sizeof(iface->addr));
}
void
send_address_withdraw(struct nbr *nbr, struct iface *iface)
{
struct buf *buf;
u_int16_t size;
if (nbr->iface->passive)
return;
log_debug("send_address_withdraw: neighbor ID %s", inet_ntoa(nbr->id));
if ((buf = buf_open(LDP_MAX_LEN)) == NULL)
fatal("send_address_withdraw");
/* XXX: multiple address on the same iface? */
size = LDP_HDR_SIZE + sizeof(struct ldp_msg) + sizeof(struct in_addr);
gen_ldp_hdr(buf, nbr->iface, size);
size -= LDP_HDR_SIZE;
gen_msg_tlv(buf, MSG_TYPE_ADDRWITHDRAW, size);
size -= sizeof(struct ldp_msg);
gen_address_list_tlv(buf, iface, size);
evbuf_enqueue(&nbr->wbuf, buf);
}
int
recv_address_withdraw(struct nbr *nbr, char *buf, u_int16_t len)
{
struct ldp_msg *aw;
struct address_list_tlv *alt;
struct in_addr *address;
log_debug("recv_address_withdraw: neighbor ID %s", inet_ntoa(nbr->id));
aw = (struct ldp_msg *)buf;
if ((len - TLV_HDR_LEN) < ntohs(aw->length)) {
session_shutdown(nbr, S_BAD_MSG_LEN, aw->msgid, aw->type);
return (-1);
}
buf += sizeof(struct ldp_msg);
len -= sizeof(struct ldp_msg);
alt = (struct address_list_tlv *)buf;
if (len < sizeof(*alt) ||
(len - TLV_HDR_LEN) < ntohs(alt->length)) {
session_shutdown(nbr, S_BAD_TLV_LEN, aw->msgid, aw->type);
return (-1);
}
if (alt->type != TLV_TYPE_ADDRLIST) {
session_shutdown(nbr, S_UNKNOWN_TLV, aw->msgid, aw->type);
return (-1);
}
/* For now we just support IPv4 */
if (alt->family != AF_INET) {
send_notification_nbr(nbr, S_UNSUP_ADDR, aw->msgid, aw->type);
return (-1);
}
buf += sizeof(*alt);
len -= sizeof(*alt);
address = (struct in_addr *)buf;
while (len >= sizeof(address)) {
ldpe_imsg_compose_lde(IMSG_ADDRESS_DEL, nbr->peerid, 0,
address, sizeof(*address));
address++;
len -= sizeof(*address);
}
return (ntohs(aw->length));
}
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