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|
/* $OpenBSD$ */
/*
* 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 <zebra.h>
#include "ldpd.h"
#include "ldpe.h"
#include "lde.h"
#include "log.h"
#include "ldp_debug.h"
static void send_address(struct nbr *, int, struct if_addr_head *,
unsigned int, int);
static int gen_address_list_tlv(struct ibuf *, int, struct if_addr_head *,
unsigned int);
static int gen_mac_list_tlv(struct ibuf *, uint8_t *);
static void address_list_add(struct if_addr_head *, struct if_addr *);
static void address_list_clr(struct if_addr_head *);
static void log_msg_address(int, uint16_t, struct nbr *, int,
union ldpd_addr *);
static void log_msg_mac_withdrawal(int, struct nbr *, uint8_t *);
static void
send_address(struct nbr *nbr, int af, struct if_addr_head *addr_list,
unsigned int addr_count, int withdraw)
{
struct ibuf *buf;
uint16_t msg_type;
uint8_t addr_size;
struct if_addr *if_addr;
uint16_t size;
unsigned int tlv_addr_count = 0;
int err = 0;
/* nothing to send */
if (LIST_EMPTY(addr_list))
return;
if (!withdraw)
msg_type = MSG_TYPE_ADDR;
else
msg_type = MSG_TYPE_ADDRWITHDRAW;
switch (af) {
case AF_INET:
addr_size = sizeof(struct in_addr);
break;
case AF_INET6:
addr_size = sizeof(struct in6_addr);
break;
default:
fatalx("send_address: unknown af");
}
while ((if_addr = LIST_FIRST(addr_list)) != NULL) {
/*
* Send as many addresses as possible - respect the session's
* negotiated maximum pdu length.
*/
size = LDP_HDR_SIZE + LDP_MSG_SIZE + ADDR_LIST_SIZE;
if (size + addr_count * addr_size <= nbr->max_pdu_len)
tlv_addr_count = addr_count;
else
tlv_addr_count = (nbr->max_pdu_len - size) / addr_size;
size += tlv_addr_count * addr_size;
addr_count -= tlv_addr_count;
if ((buf = ibuf_open(size)) == NULL)
fatal(__func__);
err |= gen_ldp_hdr(buf, size);
size -= LDP_HDR_SIZE;
err |= gen_msg_hdr(buf, msg_type, size);
size -= LDP_MSG_SIZE;
err |= gen_address_list_tlv(buf, af, addr_list, tlv_addr_count);
if (err) {
address_list_clr(addr_list);
ibuf_free(buf);
return;
}
while ((if_addr = LIST_FIRST(addr_list)) != NULL) {
log_msg_address(1, msg_type, nbr, af, &if_addr->addr);
LIST_REMOVE(if_addr, entry);
free(if_addr);
if (--tlv_addr_count == 0)
break;
}
evbuf_enqueue(&nbr->tcp->wbuf, buf);
}
nbr_fsm(nbr, NBR_EVT_PDU_SENT);
}
void
send_address_single(struct nbr *nbr, struct if_addr *if_addr, int withdraw)
{
struct if_addr_head addr_list;
LIST_INIT(&addr_list);
address_list_add(&addr_list, if_addr);
send_address(nbr, if_addr->af, &addr_list, 1, withdraw);
}
void
send_address_all(struct nbr *nbr, int af)
{
struct if_addr_head addr_list;
struct if_addr *if_addr;
unsigned int addr_count = 0;
LIST_INIT(&addr_list);
LIST_FOREACH(if_addr, &global.addr_list, entry) {
if (if_addr->af != af)
continue;
address_list_add(&addr_list, if_addr);
addr_count++;
}
send_address(nbr, af, &addr_list, addr_count, 0);
}
void
send_mac_withdrawal(struct nbr *nbr, struct map *fec, uint8_t *mac)
{
struct ibuf *buf;
uint16_t size;
int err;
size = LDP_HDR_SIZE + LDP_MSG_SIZE + ADDR_LIST_SIZE + len_fec_tlv(fec) +
TLV_HDR_SIZE;
if (mac)
size += ETHER_ADDR_LEN;
if ((buf = ibuf_open(size)) == NULL)
fatal(__func__);
err = gen_ldp_hdr(buf, size);
size -= LDP_HDR_SIZE;
err |= gen_msg_hdr(buf, MSG_TYPE_ADDRWITHDRAW, size);
size -= LDP_MSG_SIZE;
err |= gen_address_list_tlv(buf, AF_INET, NULL, 0);
err |= gen_fec_tlv(buf, fec);
err |= gen_mac_list_tlv(buf, mac);
if (err) {
ibuf_free(buf);
return;
}
log_msg_mac_withdrawal(1, nbr, mac);
evbuf_enqueue(&nbr->tcp->wbuf, buf);
nbr_fsm(nbr, NBR_EVT_PDU_SENT);
}
int
recv_address(struct nbr *nbr, char *buf, uint16_t len)
{
struct ldp_msg msg;
uint16_t msg_type;
enum imsg_type type;
struct address_list_tlv alt;
uint16_t alt_len;
uint16_t alt_family;
struct lde_addr lde_addr;
memcpy(&msg, buf, sizeof(msg));
msg_type = ntohs(msg.type);
switch (msg_type) {
case MSG_TYPE_ADDR:
type = IMSG_ADDRESS_ADD;
break;
case MSG_TYPE_ADDRWITHDRAW:
type = IMSG_ADDRESS_DEL;
break;
default:
fatalx("recv_address: unexpected msg type");
}
buf += LDP_MSG_SIZE;
len -= LDP_MSG_SIZE;
/* Address List TLV */
if (len < ADDR_LIST_SIZE) {
session_shutdown(nbr, S_BAD_MSG_LEN, msg.id, msg.type);
return (-1);
}
memcpy(&alt, buf, sizeof(alt));
alt_len = ntohs(alt.length);
alt_family = ntohs(alt.family);
if (alt_len > len - TLV_HDR_SIZE) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
return (-1);
}
if (ntohs(alt.type) != TLV_TYPE_ADDRLIST) {
send_notification(nbr->tcp, S_MISS_MSG, msg.id, msg.type);
return (-1);
}
switch (alt_family) {
case AF_IPV4:
if (!nbr->v4_enabled)
/* just ignore the message */
return (0);
break;
case AF_IPV6:
if (!nbr->v6_enabled)
/* just ignore the message */
return (0);
break;
default:
send_notification(nbr->tcp, S_UNSUP_ADDR, msg.id, msg.type);
return (-1);
}
alt_len -= sizeof(alt.family);
buf += sizeof(alt);
len -= sizeof(alt);
/* Process all received addresses */
while (alt_len > 0) {
switch (alt_family) {
case AF_IPV4:
if (alt_len < sizeof(struct in_addr)) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg.id,
msg.type);
return (-1);
}
memset(&lde_addr, 0, sizeof(lde_addr));
lde_addr.af = AF_INET;
memcpy(&lde_addr.addr, buf, sizeof(struct in_addr));
buf += sizeof(struct in_addr);
len -= sizeof(struct in_addr);
alt_len -= sizeof(struct in_addr);
break;
case AF_IPV6:
if (alt_len < sizeof(struct in6_addr)) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg.id,
msg.type);
return (-1);
}
memset(&lde_addr, 0, sizeof(lde_addr));
lde_addr.af = AF_INET6;
memcpy(&lde_addr.addr, buf, sizeof(struct in6_addr));
buf += sizeof(struct in6_addr);
len -= sizeof(struct in6_addr);
alt_len -= sizeof(struct in6_addr);
break;
default:
fatalx("recv_address: unknown af");
}
log_msg_address(0, msg_type, nbr, lde_addr.af, &lde_addr.addr);
ldpe_imsg_compose_lde(type, nbr->peerid, 0, &lde_addr,
sizeof(lde_addr));
}
/* Optional Parameters */
while (len > 0) {
struct tlv tlv;
uint16_t tlv_type;
uint16_t tlv_len;
if (len < sizeof(tlv)) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
return (-1);
}
memcpy(&tlv, buf, TLV_HDR_SIZE);
tlv_type = ntohs(tlv.type);
tlv_len = ntohs(tlv.length);
if (tlv_len + TLV_HDR_SIZE > len) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
return (-1);
}
buf += TLV_HDR_SIZE;
len -= TLV_HDR_SIZE;
switch (tlv_type) {
default:
if (!(ntohs(tlv.type) & UNKNOWN_FLAG))
send_notification_rtlvs(nbr, S_UNKNOWN_TLV,
msg.id, msg.type, tlv_type, tlv_len, buf);
/* ignore unknown tlv */
break;
}
buf += tlv_len;
len -= tlv_len;
}
return (0);
}
static int
gen_address_list_tlv(struct ibuf *buf, int af, struct if_addr_head *addr_list,
unsigned int tlv_addr_count)
{
struct address_list_tlv alt;
uint16_t addr_size;
struct if_addr *if_addr;
int err = 0;
memset(&alt, 0, sizeof(alt));
alt.type = htons(TLV_TYPE_ADDRLIST);
switch (af) {
case AF_INET:
alt.family = htons(AF_IPV4);
addr_size = sizeof(struct in_addr);
break;
case AF_INET6:
alt.family = htons(AF_IPV6);
addr_size = sizeof(struct in6_addr);
break;
default:
fatalx("gen_address_list_tlv: unknown af");
}
alt.length = htons(sizeof(alt.family) + addr_size * tlv_addr_count);
err |= ibuf_add(buf, &alt, sizeof(alt));
if (addr_list == NULL)
return (err);
LIST_FOREACH(if_addr, addr_list, entry) {
err |= ibuf_add(buf, &if_addr->addr, addr_size);
if (--tlv_addr_count == 0)
break;
}
return (err);
}
static int
gen_mac_list_tlv(struct ibuf *buf, uint8_t *mac)
{
struct tlv tlv;
int err;
memset(&tlv, 0, sizeof(tlv));
tlv.type = htons(TLV_TYPE_MAC_LIST);
if (mac)
tlv.length = htons(ETHER_ADDR_LEN);
err = ibuf_add(buf, &tlv, sizeof(tlv));
if (mac)
err |= ibuf_add(buf, mac, ETHER_ADDR_LEN);
return (err);
}
static void
address_list_add(struct if_addr_head *addr_list, struct if_addr *if_addr)
{
struct if_addr *new;
new = malloc(sizeof(*new));
if (new == NULL)
fatal(__func__);
*new = *if_addr;
LIST_INSERT_HEAD(addr_list, new, entry);
}
static void
address_list_clr(struct if_addr_head *addr_list)
{
struct if_addr *if_addr;
while ((if_addr = LIST_FIRST(addr_list)) != NULL) {
LIST_REMOVE(if_addr, entry);
free(if_addr);
}
}
static void
log_msg_address(int out, uint16_t msg_type, struct nbr *nbr, int af,
union ldpd_addr *addr)
{
debug_msg(out, "%s: lsr-id %s, address %s", msg_name(msg_type),
inet_ntoa(nbr->id), log_addr(af, addr));
}
static void
log_msg_mac_withdrawal(int out, struct nbr *nbr, uint8_t *mac)
{
char buf[ETHER_ADDR_STRLEN];
debug_msg(out, "mac withdrawal: lsr-id %s, mac %s", inet_ntoa(nbr->id),
(mac) ? prefix_mac2str((struct ethaddr *)mac, buf, sizeof(buf)) :
"wildcard");
}
|