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frr/ldpd/labelmapping.c

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// SPDX-License-Identifier: ISC
/* $OpenBSD$ */
/*
* Copyright (c) 2014, 2015 Renato Westphal <renato@openbsd.org>
* Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
*/
#include <zebra.h>
#include "ldpd.h"
#include "ldpe.h"
#include "log.h"
#include "ldp_debug.h"
#include "mpls.h"
static void enqueue_pdu(struct nbr *, uint16_t, struct ibuf *, uint16_t);
static int gen_label_tlv(struct ibuf *, uint32_t);
static int gen_reqid_tlv(struct ibuf *, uint32_t);
static void log_msg_mapping(int, uint16_t, struct nbr *, struct map *);
static void
enqueue_pdu(struct nbr *nbr, uint16_t type, struct ibuf *buf, uint16_t size)
{
struct ldp_hdr *ldp_hdr;
ldp_hdr = ibuf_seek(buf, 0, sizeof(struct ldp_hdr));
ldp_hdr->length = htons(size - LDP_HDR_DEAD_LEN);
evbuf_enqueue(&nbr->tcp->wbuf, buf);
}
/* Generic function that handles all Label Message types */
void
send_labelmessage(struct nbr *nbr, uint16_t type, struct mapping_head *mh)
{
struct ibuf *buf = NULL;
struct mapping_entry *me;
uint16_t msg_size, size = 0;
int first = 1;
int err = 0;
/* nothing to send */
if (TAILQ_EMPTY(mh))
return;
while ((me = TAILQ_FIRST(mh)) != NULL) {
/* generate pdu */
if (first) {
if ((buf = ibuf_open(nbr->max_pdu_len + LDP_HDR_DEAD_LEN)) == NULL)
fatal(__func__);
/* real size will be set up later */
SET_FLAG(err, gen_ldp_hdr(buf, 0));
size = LDP_HDR_SIZE;
first = 0;
}
/* calculate size */
msg_size = LDP_MSG_SIZE;
msg_size += len_fec_tlv(&me->map);
if (me->map.label != NO_LABEL)
msg_size += LABEL_TLV_SIZE;
if (CHECK_FLAG(me->map.flags, F_MAP_REQ_ID))
msg_size += REQID_TLV_SIZE;
if (CHECK_FLAG(me->map.flags, F_MAP_STATUS))
msg_size += STATUS_SIZE;
/* maximum pdu length exceeded, we need a new ldp pdu */
if (size + msg_size > nbr->max_pdu_len) {
enqueue_pdu(nbr, type, buf, size);
first = 1;
continue;
}
size += msg_size;
/* append message and tlvs */
SET_FLAG(err, gen_msg_hdr(buf, type, msg_size));
SET_FLAG(err, gen_fec_tlv(buf, &me->map));
if (me->map.label != NO_LABEL)
SET_FLAG(err, gen_label_tlv(buf, me->map.label));
if (CHECK_FLAG(me->map.flags, F_MAP_REQ_ID))
SET_FLAG(err, gen_reqid_tlv(buf, me->map.requestid));
if (CHECK_FLAG(me->map.flags, F_MAP_PW_STATUS))
SET_FLAG(err, gen_pw_status_tlv(buf, me->map.pw_status));
if (CHECK_FLAG(me->map.flags, F_MAP_STATUS))
SET_FLAG(err, gen_status_tlv(buf, me->map.st.status_code,
me->map.st.msg_id, me->map.st.msg_type));
if (err) {
ibuf_free(buf);
mapping_list_clr(mh);
return;
}
log_msg_mapping(1, type, nbr, &me->map);
/* no errors - update per neighbor message counters */
switch (type) {
case MSG_TYPE_LABELMAPPING:
nbr->stats.labelmap_sent++;
break;
case MSG_TYPE_LABELREQUEST:
nbr->stats.labelreq_sent++;
break;
case MSG_TYPE_LABELWITHDRAW:
nbr->stats.labelwdraw_sent++;
break;
case MSG_TYPE_LABELRELEASE:
nbr->stats.labelrel_sent++;
break;
case MSG_TYPE_LABELABORTREQ:
nbr->stats.labelabreq_sent++;
break;
default:
break;
}
TAILQ_REMOVE(mh, me, entry);
assert(me != TAILQ_FIRST(mh));
free(me);
}
enqueue_pdu(nbr, type, buf, size);
nbr_fsm(nbr, NBR_EVT_PDU_SENT);
}
/* Generic function that handles all Label Message types */
int
recv_labelmessage(struct nbr *nbr, char *buf, uint16_t len, uint16_t type)
{
struct ldp_msg msg;
struct tlv ft;
uint32_t label = NO_LABEL, reqid = 0;
uint32_t pw_status = 0;
uint8_t flags = 0;
int feclen, tlen;
uint16_t current_tlv = 1;
struct mapping_entry *me;
struct mapping_head mh;
struct map map;
memcpy(&msg, buf, sizeof(msg));
buf += LDP_MSG_SIZE;
len -= LDP_MSG_SIZE;
/* FEC TLV */
if (len < sizeof(ft)) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
return (-1);
}
memcpy(&ft, buf, sizeof(ft));
if (ntohs(ft.type) != TLV_TYPE_FEC) {
send_notification(nbr->tcp, S_MISS_MSG, msg.id, msg.type);
return (-1);
}
feclen = ntohs(ft.length);
if (feclen > len - TLV_HDR_SIZE) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
return (-1);
}
buf += TLV_HDR_SIZE; /* just advance to the end of the fec header */
len -= TLV_HDR_SIZE;
TAILQ_INIT(&mh);
do {
memset(&map, 0, sizeof(map));
map.msg_id = msg.id;
if ((tlen = tlv_decode_fec_elm(nbr, &msg, buf, feclen, &map)) == -1)
goto err;
if (map.type == MAP_TYPE_PWID &&
!CHECK_FLAG(map.flags, F_MAP_PW_ID) &&
type != MSG_TYPE_LABELWITHDRAW &&
type != MSG_TYPE_LABELRELEASE) {
send_notification(nbr->tcp, S_MISS_MSG, msg.id, msg.type);
goto err;
}
/*
* The Wildcard FEC Element can be used only in the
* Label Withdraw and Label Release messages.
*/
if (map.type == MAP_TYPE_WILDCARD) {
switch (type) {
case MSG_TYPE_LABELMAPPING:
case MSG_TYPE_LABELREQUEST:
case MSG_TYPE_LABELABORTREQ:
session_shutdown(nbr, S_UNKNOWN_FEC, msg.id, msg.type);
goto err;
default:
break;
}
}
/*
* RFC 5561 - Section 4:
* "An LDP implementation that supports the Typed Wildcard
* FEC Element MUST support its use in Label Request, Label
* Withdraw, and Label Release messages".
*/
if (map.type == MAP_TYPE_TYPED_WCARD) {
switch (type) {
case MSG_TYPE_LABELMAPPING:
case MSG_TYPE_LABELABORTREQ:
session_shutdown(nbr, S_UNKNOWN_FEC, msg.id, msg.type);
goto err;
default:
break;
}
}
/*
* LDP supports the use of multiple FEC Elements per
* FEC for the Label Mapping message only.
*/
if (type != MSG_TYPE_LABELMAPPING && tlen != feclen) {
session_shutdown(nbr, S_BAD_TLV_VAL, msg.id, msg.type);
goto err;
}
mapping_list_add(&mh, &map);
buf += tlen;
len -= tlen;
feclen -= tlen;
} while (feclen > 0);
/* Optional Parameters */
while (len > 0) {
struct tlv tlv;
uint16_t tlv_type;
uint16_t tlv_len;
uint32_t reqbuf, labelbuf, statusbuf;
if (len < sizeof(tlv)) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
goto err;
}
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);
goto err;
}
buf += TLV_HDR_SIZE;
len -= TLV_HDR_SIZE;
/*
* For Label Mapping messages the Label TLV is mandatory and
* should appear right after the FEC TLV.
*/
if (current_tlv == 1 &&
type == MSG_TYPE_LABELMAPPING &&
!CHECK_FLAG(tlv_type, TLV_TYPE_GENERICLABEL)) {
send_notification(nbr->tcp, S_MISS_MSG, msg.id, msg.type);
goto err;
}
switch (tlv_type) {
case TLV_TYPE_LABELREQUEST:
switch (type) {
case MSG_TYPE_LABELMAPPING:
case MSG_TYPE_LABELREQUEST:
if (tlv_len != REQID_TLV_LEN) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
goto err;
}
SET_FLAG(flags, F_MAP_REQ_ID);
memcpy(&reqbuf, buf, sizeof(reqbuf));
reqid = ntohl(reqbuf);
break;
default:
/* ignore */
break;
}
break;
case TLV_TYPE_HOPCOUNT:
case TLV_TYPE_PATHVECTOR:
/* ignore */
break;
case TLV_TYPE_GENERICLABEL:
switch (type) {
case MSG_TYPE_LABELMAPPING:
case MSG_TYPE_LABELWITHDRAW:
case MSG_TYPE_LABELRELEASE:
if (tlv_len != LABEL_TLV_LEN) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
goto err;
}
memcpy(&labelbuf, buf, sizeof(labelbuf));
label = ntohl(labelbuf);
/* do not accept invalid labels */
if (label > MPLS_LABEL_MAX ||
(label <= MPLS_LABEL_RESERVED_MAX &&
label != MPLS_LABEL_IPV4_EXPLICIT_NULL &&
label != MPLS_LABEL_IPV6_EXPLICIT_NULL &&
label != MPLS_LABEL_IMPLICIT_NULL)) {
session_shutdown(nbr, S_BAD_TLV_VAL, msg.id, msg.type);
goto err;
}
break;
default:
/* ignore */
break;
}
break;
case TLV_TYPE_ATMLABEL:
case TLV_TYPE_FRLABEL:
switch (type) {
case MSG_TYPE_LABELMAPPING:
case MSG_TYPE_LABELWITHDRAW:
case MSG_TYPE_LABELRELEASE:
/* unsupported */
session_shutdown(nbr, S_BAD_TLV_VAL, msg.id, msg.type);
goto err;
break;
default:
/* ignore */
break;
}
break;
case TLV_TYPE_STATUS:
if (tlv_len != STATUS_TLV_LEN) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
goto err;
}
/* ignore */
break;
case TLV_TYPE_PW_STATUS:
switch (type) {
case MSG_TYPE_LABELMAPPING:
if (tlv_len != PW_STATUS_TLV_LEN) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
goto err;
}
SET_FLAG(flags, F_MAP_PW_STATUS);
memcpy(&statusbuf, buf, sizeof(statusbuf));
pw_status = ntohl(statusbuf);
break;
default:
/* ignore */
break;
}
break;
default:
if (!CHECK_FLAG(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;
current_tlv++;
}
/* notify lde about the received message. */
while ((me = TAILQ_FIRST(&mh)) != NULL) {
int imsg_type = IMSG_NONE;
SET_FLAG(me->map.flags, flags);
switch (me->map.type) {
case MAP_TYPE_PREFIX:
switch (me->map.fec.prefix.af) {
case AF_INET:
if (label == MPLS_LABEL_IPV6_EXPLICIT_NULL) {
session_shutdown(nbr, S_BAD_TLV_VAL, msg.id, msg.type);
goto err;
}
if (!nbr->v4_enabled)
goto next;
break;
case AF_INET6:
if (label == MPLS_LABEL_IPV4_EXPLICIT_NULL) {
session_shutdown(nbr, S_BAD_TLV_VAL, msg.id, msg.type);
goto err;
}
if (!nbr->v6_enabled)
goto next;
break;
default:
fatalx("recv_labelmessage: unknown af");
}
break;
case MAP_TYPE_PWID:
if (label <= MPLS_LABEL_RESERVED_MAX) {
session_shutdown(nbr, S_BAD_TLV_VAL, msg.id, msg.type);
goto err;
}
if (CHECK_FLAG(me->map.flags, F_MAP_PW_STATUS))
me->map.pw_status = pw_status;
break;
default:
break;
}
me->map.label = label;
if (CHECK_FLAG(me->map.flags, F_MAP_REQ_ID))
me->map.requestid = reqid;
log_msg_mapping(0, type, nbr, &me->map);
switch (type) {
case MSG_TYPE_LABELMAPPING:
imsg_type = IMSG_LABEL_MAPPING;
break;
case MSG_TYPE_LABELREQUEST:
imsg_type = IMSG_LABEL_REQUEST;
break;
case MSG_TYPE_LABELWITHDRAW:
imsg_type = IMSG_LABEL_WITHDRAW;
break;
case MSG_TYPE_LABELRELEASE:
imsg_type = IMSG_LABEL_RELEASE;
break;
case MSG_TYPE_LABELABORTREQ:
imsg_type = IMSG_LABEL_ABORT;
break;
default:
break;
}
ldpe_imsg_compose_lde(imsg_type, nbr->peerid, 0, &me->map,
sizeof(struct map));
next:
TAILQ_REMOVE(&mh, me, entry);
assert(me != TAILQ_FIRST(&mh));
free(me);
}
return (0);
err:
mapping_list_clr(&mh);
return (-1);
}
/* Other TLV related functions */
static int
gen_label_tlv(struct ibuf *buf, uint32_t label)
{
struct label_tlv lt;
lt.type = htons(TLV_TYPE_GENERICLABEL);
lt.length = htons(LABEL_TLV_LEN);
lt.label = htonl(label);
return (ibuf_add(buf, &lt, sizeof(lt)));
}
static int
gen_reqid_tlv(struct ibuf *buf, uint32_t reqid)
{
struct reqid_tlv rt;
rt.type = htons(TLV_TYPE_LABELREQUEST);
rt.length = htons(REQID_TLV_LEN);
rt.reqid = htonl(reqid);
return (ibuf_add(buf, &rt, sizeof(rt)));
}
int
gen_pw_status_tlv(struct ibuf *buf, uint32_t status)
{
struct pw_status_tlv st;
st.type = htons(TLV_TYPE_PW_STATUS);
st.length = htons(PW_STATUS_TLV_LEN);
st.value = htonl(status);
return (ibuf_add(buf, &st, sizeof(st)));
}
uint16_t
len_fec_tlv(struct map *map)
{
uint16_t len = TLV_HDR_SIZE;
switch (map->type) {
case MAP_TYPE_WILDCARD:
len += FEC_ELM_WCARD_LEN;
break;
case MAP_TYPE_PREFIX:
len += FEC_ELM_PREFIX_MIN_LEN +
PREFIX_SIZE(map->fec.prefix.prefixlen);
break;
case MAP_TYPE_PWID:
len += FEC_PWID_ELM_MIN_LEN;
if (CHECK_FLAG(map->flags, F_MAP_PW_ID))
len += PW_STATUS_TLV_LEN;
if (CHECK_FLAG(map->flags, F_MAP_PW_IFMTU))
len += FEC_SUBTLV_IFMTU_SIZE;
if (CHECK_FLAG(map->flags, F_MAP_PW_STATUS))
len += PW_STATUS_TLV_SIZE;
break;
case MAP_TYPE_TYPED_WCARD:
len += FEC_ELM_TWCARD_MIN_LEN;
switch (map->fec.twcard.type) {
case MAP_TYPE_PREFIX:
case MAP_TYPE_PWID:
len += sizeof(uint16_t);
break;
default:
fatalx("len_fec_tlv: unexpected fec type");
}
break;
default:
fatalx("len_fec_tlv: unexpected fec type");
}
return (len);
}
int
gen_fec_tlv(struct ibuf *buf, struct map *map)
{
struct tlv ft;
uint16_t family, len, pw_type, ifmtu;
uint8_t pw_len = 0, twcard_len;
uint32_t group_id, pwid;
int err = 0;
ft.type = htons(TLV_TYPE_FEC);
switch (map->type) {
case MAP_TYPE_WILDCARD:
ft.length = htons(sizeof(uint8_t));
SET_FLAG(err, ibuf_add(buf, &ft, sizeof(ft)));
SET_FLAG(err, ibuf_add(buf, &map->type, sizeof(map->type)));
break;
case MAP_TYPE_PREFIX:
len = PREFIX_SIZE(map->fec.prefix.prefixlen);
ft.length = htons(sizeof(map->type) + sizeof(family) +
sizeof(map->fec.prefix.prefixlen) + len);
SET_FLAG(err, ibuf_add(buf, &ft, sizeof(ft)));
SET_FLAG(err, ibuf_add(buf, &map->type, sizeof(map->type)));
switch (map->fec.prefix.af) {
case AF_INET:
family = htons(AF_IPV4);
break;
case AF_INET6:
family = htons(AF_IPV6);
break;
default:
fatalx("gen_fec_tlv: unknown af");
break;
}
SET_FLAG(err, ibuf_add(buf, &family, sizeof(family)));
SET_FLAG(err, ibuf_add(buf, &map->fec.prefix.prefixlen,
sizeof(map->fec.prefix.prefixlen)));
if (len)
SET_FLAG(err, ibuf_add(buf, &map->fec.prefix.prefix, len));
break;
case MAP_TYPE_PWID:
if (CHECK_FLAG(map->flags, F_MAP_PW_ID))
pw_len += FEC_PWID_SIZE;
if (CHECK_FLAG(map->flags, F_MAP_PW_IFMTU))
pw_len += FEC_SUBTLV_IFMTU_SIZE;
len = FEC_PWID_ELM_MIN_LEN + pw_len;
ft.length = htons(len);
SET_FLAG(err, ibuf_add(buf, &ft, sizeof(ft)));
SET_FLAG(err, ibuf_add(buf, &map->type, sizeof(uint8_t)));
pw_type = map->fec.pwid.type;
if (CHECK_FLAG(map->flags, F_MAP_PW_CWORD))
SET_FLAG(pw_type, CONTROL_WORD_FLAG);
pw_type = htons(pw_type);
SET_FLAG(err, ibuf_add(buf, &pw_type, sizeof(uint16_t)));
SET_FLAG(err, ibuf_add(buf, &pw_len, sizeof(uint8_t)));
group_id = htonl(map->fec.pwid.group_id);
SET_FLAG(err, ibuf_add(buf, &group_id, sizeof(uint32_t)));
if (CHECK_FLAG(map->flags, F_MAP_PW_ID)) {
pwid = htonl(map->fec.pwid.pwid);
SET_FLAG(err, ibuf_add(buf, &pwid, sizeof(uint32_t)));
}
if (CHECK_FLAG(map->flags, F_MAP_PW_IFMTU)) {
struct subtlv stlv;
stlv.type = SUBTLV_IFMTU;
stlv.length = FEC_SUBTLV_IFMTU_SIZE;
SET_FLAG(err, ibuf_add(buf, &stlv, sizeof(uint16_t)));
ifmtu = htons(map->fec.pwid.ifmtu);
SET_FLAG(err, ibuf_add(buf, &ifmtu, sizeof(uint16_t)));
}
break;
case MAP_TYPE_TYPED_WCARD:
len = FEC_ELM_TWCARD_MIN_LEN;
switch (map->fec.twcard.type) {
case MAP_TYPE_PREFIX:
case MAP_TYPE_PWID:
len += sizeof(uint16_t);
break;
default:
fatalx("gen_fec_tlv: unexpected fec type");
}
ft.length = htons(len);
SET_FLAG(err, ibuf_add(buf, &ft, sizeof(ft)));
SET_FLAG(err, ibuf_add(buf, &map->type, sizeof(uint8_t)));
SET_FLAG(err, ibuf_add(buf, &map->fec.twcard.type, sizeof(uint8_t)));
switch (map->fec.twcard.type) {
case MAP_TYPE_PREFIX:
twcard_len = sizeof(uint16_t);
SET_FLAG(err, ibuf_add(buf, &twcard_len, sizeof(uint8_t)));
switch (map->fec.twcard.u.prefix_af) {
case AF_INET:
family = htons(AF_IPV4);
break;
case AF_INET6:
family = htons(AF_IPV6);
break;
default:
fatalx("gen_fec_tlv: unknown af");
break;
}
SET_FLAG(err, ibuf_add(buf, &family, sizeof(uint16_t)));
break;
case MAP_TYPE_PWID:
twcard_len = sizeof(uint16_t);
SET_FLAG(err, ibuf_add(buf, &twcard_len, sizeof(uint8_t)));
pw_type = htons(map->fec.twcard.u.pw_type);
SET_FLAG(err, ibuf_add(buf, &pw_type, sizeof(uint16_t)));
break;
default:
fatalx("gen_fec_tlv: unexpected fec type");
}
break;
default:
break;
}
return (err);
}
int
tlv_decode_fec_elm(struct nbr *nbr, struct ldp_msg *msg, char *buf,
uint16_t len, struct map *map)
{
uint16_t off = 0;
uint8_t pw_len, twcard_len;
map->type = *buf;
off += sizeof(uint8_t);
switch (map->type) {
case MAP_TYPE_WILDCARD:
if (len == FEC_ELM_WCARD_LEN)
return (off);
else {
session_shutdown(nbr, S_BAD_TLV_VAL, msg->id, msg->type);
return (-1);
}
break;
case MAP_TYPE_PREFIX:
if (len < FEC_ELM_PREFIX_MIN_LEN) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg->id, msg->type);
return (-1);
}
/* Address Family */
memcpy(&map->fec.prefix.af, buf + off, sizeof(map->fec.prefix.af));
off += sizeof(map->fec.prefix.af);
map->fec.prefix.af = ntohs(map->fec.prefix.af);
switch (map->fec.prefix.af) {
case AF_IPV4:
map->fec.prefix.af = AF_INET;
break;
case AF_IPV6:
map->fec.prefix.af = AF_INET6;
break;
default:
send_notification(nbr->tcp, S_UNSUP_ADDR, msg->id, msg->type);
return (-1);
}
/* Prefix Length */
map->fec.prefix.prefixlen = buf[off];
off += sizeof(uint8_t);
if ((map->fec.prefix.af == AF_IPV4
&& map->fec.prefix.prefixlen > IPV4_MAX_BITLEN)
|| (map->fec.prefix.af == AF_IPV6
&& map->fec.prefix.prefixlen > IPV6_MAX_BITLEN)) {
session_shutdown(nbr, S_BAD_TLV_VAL, msg->id, msg->type);
return (-1);
}
if (len < off + PREFIX_SIZE(map->fec.prefix.prefixlen)) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg->id, msg->type);
return (-1);
}
/* Prefix */
memset(&map->fec.prefix.prefix, 0, sizeof(map->fec.prefix.prefix));
memcpy(&map->fec.prefix.prefix, buf + off,
PREFIX_SIZE(map->fec.prefix.prefixlen));
/* Just in case... */
ldp_applymask(map->fec.prefix.af, &map->fec.prefix.prefix,
&map->fec.prefix.prefix, map->fec.prefix.prefixlen);
return (off + PREFIX_SIZE(map->fec.prefix.prefixlen));
case MAP_TYPE_PWID:
if (len < FEC_PWID_ELM_MIN_LEN) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg->id, msg->type);
return (-1);
}
/* PW type */
memcpy(&map->fec.pwid.type, buf + off, sizeof(uint16_t));
map->fec.pwid.type = ntohs(map->fec.pwid.type);
if (CHECK_FLAG(map->fec.pwid.type, CONTROL_WORD_FLAG)) {
SET_FLAG(map->flags, F_MAP_PW_CWORD);
UNSET_FLAG(map->fec.pwid.type, CONTROL_WORD_FLAG);
}
off += sizeof(uint16_t);
/* PW info Length */
pw_len = buf[off];
off += sizeof(uint8_t);
if (len != FEC_PWID_ELM_MIN_LEN + pw_len) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg->id, msg->type);
return (-1);
}
/* Group ID */
memcpy(&map->fec.pwid.group_id, buf + off, sizeof(uint32_t));
map->fec.pwid.group_id = ntohl(map->fec.pwid.group_id);
off += sizeof(uint32_t);
/* PW ID */
if (pw_len == 0)
return (off);
if (pw_len < sizeof(uint32_t)) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg->id, msg->type);
return (-1);
}
memcpy(&map->fec.pwid.pwid, buf + off, sizeof(uint32_t));
map->fec.pwid.pwid = ntohl(map->fec.pwid.pwid);
SET_FLAG(map->flags, F_MAP_PW_ID);
off += sizeof(uint32_t);
pw_len -= sizeof(uint32_t);
/* Optional Interface Parameter Sub-TLVs */
while (pw_len > 0) {
struct subtlv stlv;
if (pw_len < sizeof(stlv)) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg->id, msg->type);
return (-1);
}
memcpy(&stlv, buf + off, sizeof(stlv));
if (stlv.length > pw_len) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg->id, msg->type);
return (-1);
}
switch (stlv.type) {
case SUBTLV_IFMTU:
if (stlv.length != FEC_SUBTLV_IFMTU_SIZE) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg->id, msg->type);
return (-1);
}
memcpy(&map->fec.pwid.ifmtu, buf + off +
SUBTLV_HDR_SIZE, sizeof(uint16_t));
map->fec.pwid.ifmtu = ntohs(map->fec.pwid.ifmtu);
SET_FLAG(map->flags, F_MAP_PW_IFMTU);
break;
default:
/* ignore */
break;
}
off += stlv.length;
pw_len -= stlv.length;
}
return (off);
case MAP_TYPE_TYPED_WCARD:
if (len < FEC_ELM_TWCARD_MIN_LEN) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg->id, msg->type);
return (-1);
}
memcpy(&map->fec.twcard.type, buf + off, sizeof(uint8_t));
off += sizeof(uint8_t);
memcpy(&twcard_len, buf + off, sizeof(uint8_t));
off += sizeof(uint8_t);
if (len != FEC_ELM_TWCARD_MIN_LEN + twcard_len) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg->id, msg->type);
return (-1);
}
switch (map->fec.twcard.type) {
case MAP_TYPE_PREFIX:
if (twcard_len != sizeof(uint16_t)) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg->id, msg->type);
return (-1);
}
memcpy(&map->fec.twcard.u.prefix_af, buf + off, sizeof(uint16_t));
map->fec.twcard.u.prefix_af = ntohs(map->fec.twcard.u.prefix_af);
off += sizeof(uint16_t);
switch (map->fec.twcard.u.prefix_af) {
case AF_IPV4:
map->fec.twcard.u.prefix_af = AF_INET;
break;
case AF_IPV6:
map->fec.twcard.u.prefix_af = AF_INET6;
break;
default:
session_shutdown(nbr, S_BAD_TLV_VAL, msg->id, msg->type);
return (-1);
}
break;
case MAP_TYPE_PWID:
if (twcard_len != sizeof(uint16_t)) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg->id, msg->type);
return (-1);
}
memcpy(&map->fec.twcard.u.pw_type, buf + off, sizeof(uint16_t));
map->fec.twcard.u.pw_type = ntohs(map->fec.twcard.u.pw_type);
/* ignore the reserved bit as per RFC 6667 */
map->fec.twcard.u.pw_type &= ~PW_TWCARD_RESERVED_BIT;
off += sizeof(uint16_t);
break;
default:
send_notification(nbr->tcp, S_UNKNOWN_FEC, msg->id, msg->type);
return (-1);
}
return (off);
default:
send_notification(nbr->tcp, S_UNKNOWN_FEC, msg->id, msg->type);
break;
}
return (-1);
}
static void
log_msg_mapping(int out, uint16_t msg_type, struct nbr *nbr, struct map *map)
{
debug_msg(out, "%s: lsr-id %pI4, fec %s, label %s", msg_name(msg_type),
&nbr->id, log_map(map), log_label(map->label));
}
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