ubgpsuite/lonetix/bgp/mrt.c

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2021-06-07 16:55:13 +02:00
// SPDX-License-Identifier: LGPL-3.0-or-later
/**
* \file bgp/mrt.c
*
* Deals with Multi-Threaded Routing Toolkit (MRT) format.
*
* \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
* \author Lorenzo Cogotti
*/
#include "bgp/bgp_local.h"
#include "sys/endian.h"
#include "sys/interlocked.h"
#include <assert.h>
#include <string.h>
static void *MRT_DATAPTR(const Mrtrecord *rec)
{
return rec->buf + MRT_HDRSIZ + (MRT_ISEXHDRTYPE(MRT_HDR(rec)->type) << 2);
}
Judgement Bgp_MrtFromBuf(Mrtrecord *rec, const void *buf, size_t nbytes)
{
if (nbytes < MRT_HDRSIZ)
return Bgp_SetErrStat(BGPETRUNCMRT);
const Mrthdr *hdr = (const Mrthdr *) buf;
size_t left = beswap32(hdr->len);
if (MRT_ISEXHDRTYPE(hdr->type))
left += 4; // account for extended timestamp
size_t siz = sizeof(*hdr) + left;
if (siz > nbytes)
return Bgp_SetErrStat(BGPETRUNCMRT);
const MemOps *memOps = MRT_MEMOPS(rec);
rec->buf = (Uint8 *) memOps->Alloc(rec->allocp, siz, NULL);
if (!rec->buf)
return Bgp_SetErrStat(BGPENOMEM);
rec->peerOffTab = NULL;
memcpy(rec->buf, buf, siz);
return Bgp_SetErrStat(BGPENOERR);
}
Judgement Bgp_ReadMrt(Mrtrecord *rec, void *streamp, const StmOps *ops)
{
Mrthdr hdr;
// Read header
Sint64 n = ops->Read(streamp, &hdr, sizeof(hdr));
if (n == 0) {
// Precisely at end of file, no error, just no more records
Bgp_SetErrStat(BGPENOERR);
return NG;
}
if (n < 0)
return Bgp_SetErrStat(BGPEIO);
if ((size_t) n != sizeof(hdr))
return Bgp_SetErrStat(BGPEIO);
size_t left = beswap32(hdr.len);
if (MRT_ISEXHDRTYPE(hdr.type))
left += 4; // account for extended timestamp
// Allocate buffer
// NOTE: MRT header length doesn't account for header size itself
size_t siz = sizeof(hdr) + left;
const MemOps *memOps = MRT_MEMOPS(rec);
rec->buf = (Uint8 *) memOps->Alloc(rec->allocp, siz, NULL);
if (!rec->buf)
return Bgp_SetErrStat(BGPENOMEM);
// Populate buffer
memcpy(rec->buf, &hdr, sizeof(hdr));
n = ops->Read(streamp, rec->buf + sizeof(hdr), left);
if (n < 0) {
Bgp_SetErrStat(BGPEIO);
goto fail;
}
if ((size_t) n != left) {
Bgp_SetErrStat(BGPEIO);
goto fail;
}
rec->peerOffTab = NULL;
return Bgp_SetErrStat(BGPENOERR);
fail:
memOps->Free(rec->allocp, rec->buf);
return NG;
}
#define MRT_PEERIDX_MINSIZ (4 + 2 + 2)
Mrtpeeridx *Bgp_GetMrtPeerIndex(Mrtrecord *rec)
{
const Mrthdr *hdr = MRT_HDR(rec);
if (hdr->type != MRT_TABLE_DUMPV2 || hdr->subtype != TABLE_DUMPV2_PEER_INDEX_TABLE) {
Bgp_SetErrStat(BGPEBADMRTTYPE);
return NULL;
}
// Basic size check (only for fixed size portion)
size_t len = beswap32(hdr->len);
size_t siz = MRT_PEERIDX_MINSIZ;
if (len < siz) {
Bgp_SetErrStat(BGPETRUNCMRT);
return NULL;
}
// NOTE: PEER_INDEX_TABLE cannot have extended timestamp
assert(!MRT_ISEXHDRTYPE(hdr->subtype));
Mrtpeeridx *peerIdx = (Mrtpeeridx *) (hdr + 1);
// View Name field size check
siz += beswap16(peerIdx->viewNameLen);
if (len < siz) {
Bgp_SetErrStat(BGPETRUNCMRT);
return NULL;
}
Bgp_SetErrStat(BGPENOERR);
return peerIdx;
}
void *Bgp_GetMrtPeerIndexPeers(Mrtrecord *rec, size_t *peersCount, size_t *nbytes)
{
const Mrthdr *hdr = MRT_HDR(rec);
if (hdr->type != MRT_TABLE_DUMPV2 || hdr->subtype != TABLE_DUMPV2_PEER_INDEX_TABLE) {
Bgp_SetErrStat(BGPEBADMRTTYPE);
return NULL;
}
// Basic size check
size_t len = beswap32(hdr->len);
size_t off = 4; // BGP Identifier
if (len < off + 2) { // view name length
Bgp_SetErrStat(BGPETRUNCMRT);
return NULL;
}
// NOTE: PEER_INDEX_TABLE cannot have extended timestamp
assert(!MRT_ISEXHDRTYPE(hdr->subtype));
Mrtpeeridx *peerIdx = (Mrtpeeridx *) (hdr + 1);
// View Name size check
off += 2 + beswap16(peerIdx->viewNameLen); // skip view name
if (len < off + 2) { // entry count
Bgp_SetErrStat(BGPETRUNCMRT);
return NULL;
}
Bgp_SetErrStat(BGPENOERR);
// Calculate relevant sizes and return peers chunk
if (peersCount) {
Uint16 count;
memcpy(&count, (Uint8 *) peerIdx + off, sizeof(count));
*peersCount = beswap16(count);
}
off += 2; // skip peers count
if (nbytes)
*nbytes = len - off;
return (Uint8 *) peerIdx + off;
}
static size_t MRT_PEERENTSIZ(const Mrtpeerentv2 *ent)
{
size_t len = 1 + 4;
len += MRT_ISPEERASN32BIT(ent->type) ? 4 : 2;
len += MRT_ISPEERIPV6(ent->type) ? IPV6_SIZE : IPV4_SIZE;
return len;
}
static Mrtpeertabv2 *Bgp_GetPeerOffsetTable(Mrtrecord *rec)
{
Mrtpeertabv2 *tab;
while (TRUE) {
tab = (Mrtpeertabv2 *) Smp_AtomicLoadPtrAcq(&rec->peerOffTab);
if (tab)
break; // already allocated
// Must allocate the table anew
size_t peerCount;
if (!Bgp_GetMrtPeerIndexPeers(rec, &peerCount, /*nbytes=*/NULL))
return NULL; // bad record type or corrupted PEER_INDEX_TABLE
const MemOps *memOps = MRT_MEMOPS(rec);
tab = (Mrtpeertabv2 *) memOps->Alloc(rec->allocp, offsetof(Mrtpeertabv2, offsets[peerCount]), NULL);
if (!tab) {
Bgp_SetErrStat(BGPENOMEM);
return NULL;
}
Smp_AtomicStore16Rx(&tab->validCount, 0);
Smp_AtomicStore16Rx(&tab->peerCount, peerCount);
if (Smp_AtomicCasPtrRel(&rec->peerOffTab, NULL, tab))
break; // all good
memOps->Free(rec->allocp, tab); // ...somebody just allocated the table for us
}
return tab;
}
Mrtpeerentv2 *Bgp_GetMrtPeerByIndex(Mrtrecord *rec, Uint16 idx)
{
// NOTE: no extended timestamp TABLE_DUMPV2 exists, so we can simplify
// record access
Mrtpeertabv2 *tab = Bgp_GetPeerOffsetTable(rec);
if (!tab)
return NULL;
// If we have a `Mrtpeertabv2` we're positively sure that `Mrtpeeridx`
// is well formed.
const Mrthdr *hdr = MRT_HDR(rec);
const Mrtpeeridx *peerIdx = (const Mrtpeeridx *) (hdr + 1);
size_t baseOff = MRT_HDRSIZ + MRT_PEERIDX_MINSIZ + beswap16(peerIdx->viewNameLen);
// IMPORTANT INVARIANT: `tab->validCount` may change, but will only ever be
// incremented.
Uint16 validCount = Smp_AtomicLoad16Acq(&tab->validCount);
if (idx < validCount) {
// FAST PATH: Offset was cached
Uint32 off = Smp_AtomicLoad32Rx(&tab->offsets[idx]);
Bgp_SetErrStat(BGPENOERR);
return (Mrtpeerentv2 *) (rec->buf + baseOff + off);
}
// SLOW PATH: Must scan PEER_INDEX_TABLE and update offsets
// Check that a valid peer was actually requested
Uint16 peerCount = Smp_AtomicLoad16Rx(&tab->peerCount);
if (idx >= peerCount) {
Bgp_SetErrStat(BGPEBADPEERIDX);
return NULL;
}
/* NOTE: We cheat a bit:
* - if we have a `peerOffTab`, then we know PEER_INDEX_TABLE header is
* well formed, so we can build a `Mrtpeeriterv2` confidently
* without checking data integrity;
* - we know the data was well formed at least up to the last valid
* peer entry, so we can resume iteration there;
*/
Mrtpeeriterv2 it;
Mrtpeerentv2 *ent;
Uint32 lastOff;
// Initialize iterator to last known offset
if (validCount == 0)
lastOff = 0;
else {
lastOff = Smp_AtomicLoad32Rx(&tab->offsets[validCount - 1]);
ent = (Mrtpeerentv2 *) (rec->buf + baseOff + lastOff);
lastOff += MRT_PEERENTSIZ(ent);
}
it.base = rec->buf + baseOff;
it.lim = rec->buf + MRT_HDRSIZ + beswap32(hdr->len);
it.ptr = it.base + lastOff;
it.peerCount = peerCount;
it.nextIdx = validCount;
// Keep iterating to find the new entry, update table in the process
/* NOTE: We don't care if we concurrently write offsets to the table
* while some other thread also updates that, we know we'll be writing
* the same offsets in the same slots there.
*/
Uint16 newValidCount = validCount;
do {
ent = Bgp_NextMrtPeerv2(&it);
if (!ent)
return NULL; // error status already set by iterator
Uint32 off = (Uint8 *) ent - it.base;
Smp_AtomicStore32Rx(&tab->offsets[newValidCount], off);
newValidCount++;
} while (idx >= newValidCount);
// Signal what we've done to the world, don't update anything
// if somebody else changed the table under our feet.
Smp_AtomicCas16Rel(&tab->validCount, validCount, newValidCount);
return ent; // success status already set by iterator
}
Judgement Bgp_StartMrtPeersv2(Mrtpeeriterv2 *it, Mrtrecord *rec)
{
size_t peerCount, nbytes;
void *peers = (Uint8 *) Bgp_GetMrtPeerIndexPeers(rec, &peerCount, &nbytes);
if (!peers)
return NG;
it->base = (Uint8 *) peers;
it->lim = it->base + nbytes;
it->ptr = it->base;
it->peerCount = peerCount;
it->nextIdx = 0;
return OK; // success already set
}
Mrtpeerentv2 *Bgp_NextMrtPeerv2(Mrtpeeriterv2 *it)
{
if (it->ptr >= it->lim) {
// End of iteration, check for correct peer count
if (it->nextIdx == it->peerCount)
Bgp_SetErrStat(BGPENOERR);
else
Bgp_SetErrStat(BGPEBADPEERIDXCNT);
return NULL;
}
size_t left = it->lim - it->ptr;
assert(left > 0);
Mrtpeerentv2 *ent = (Mrtpeerentv2 *) it->ptr;
size_t len = MRT_PEERENTSIZ(ent);
if (left < len) {
Bgp_SetErrStat(BGPETRUNCPEERV2);
return NULL;
}
Bgp_SetErrStat(BGPENOERR);
it->ptr += len;
it->nextIdx++;
return ent;
}
Mrtribhdrv2 *Bgp_GetMrtRibHdrv2(Mrtrecord *rec, size_t *nbytes)
{
const Mrthdr *hdr = MRT_HDR(rec);
if (hdr->type != MRT_TABLE_DUMPV2) {
Bgp_SetErrStat(BGPEBADMRTTYPE);
return NULL;
}
Mrtribhdrv2 *rib = RIBV2_HDR(hdr);
size_t len = beswap32(hdr->len);
size_t offset = 0;
offset += 4; // sequence number
size_t maxPfxWidth;
if (TABLE_DUMPV2_ISGENERICRIB(hdr->subtype)) {
offset += 2 + 1; // AFI, SAFI
if (len < offset) {
Bgp_SetErrStat(BGPETRUNCMRT);
return NULL;
}
switch (rib->gen.afi) {
case AFI_IP: maxPfxWidth = IPV4_WIDTH; break;
case AFI_IP6: maxPfxWidth = IPV6_WIDTH; break;
default:
Bgp_SetErrStat(BGPEAFIUNSUP);
return NULL;
}
if (rib->gen.safi != SAFI_UNICAST && rib->gen.safi != SAFI_MULTICAST) {
Bgp_SetErrStat(BGPESAFIUNSUP);
return NULL;
}
} else if (TABLE_DUMPV2_ISIPV4RIB(hdr->subtype)) {
maxPfxWidth = IPV4_WIDTH;
} else if (TABLE_DUMPV2_ISIPV6RIB(hdr->subtype)) {
maxPfxWidth = IPV6_WIDTH;
} else {
Bgp_SetErrStat(BGPEBADMRTTYPE);
return NULL;
}
const RawPrefix *pfx = (const RawPrefix *) ((Uint8 *) rib + offset);
offset++; // prefix width
if (len < offset) {
Bgp_SetErrStat(BGPETRUNCMRT);
return NULL;
}
if (pfx->width > maxPfxWidth) {
Bgp_SetErrStat(BGPEBADPFXWIDTH);
return NULL;
}
offset += PFXLEN(pfx->width);
if (len < offset) {
Bgp_SetErrStat(BGPETRUNCMRT);
return NULL;
}
Bgp_SetErrStat(BGPENOERR);
if (nbytes)
*nbytes = offset;
return rib;
}
Mrtribentriesv2 *Bgp_GetMrtRibEntriesv2(Mrtrecord *rec, size_t *nbytes)
{
const Mrthdr *hdr = MRT_HDR(rec);
if (hdr->type != MRT_TABLE_DUMPV2) {
Bgp_SetErrStat(BGPEBADMRTTYPE);
return NULL;
}
if (!TABLE_DUMPV2_ISRIB(hdr->subtype)) {
Bgp_SetErrStat(BGPEBADMRTTYPE);
return NULL;
}
size_t len = beswap32(hdr->len);
size_t offset;
Mrtribhdrv2 *rib = Bgp_GetMrtRibHdrv2(rec, &offset);
if (!rib)
return NULL; // error already set
Mrtribentriesv2 *ents = (Mrtribentriesv2 *) ((Uint8 *) rib + offset);
offset += 2; // entries count
if (len < offset) {
Bgp_SetErrStat(BGPETRUNCMRT);
return NULL;
}
if (nbytes)
*nbytes = len - offset;
return ents;
}
Judgement Bgp_StartMrtRibEntriesv2(Mrtribiterv2 *it, Mrtrecord *rec)
{
size_t nbytes;
Mrtribentriesv2 *ents = Bgp_GetMrtRibEntriesv2(rec, &nbytes);
if (!ents)
return NG;
it->base = ents->entries;
it->lim = it->base + nbytes;
it->ptr = it->base;
it->isAddPath = TABLE_DUMPV2_ISADDPATHRIB(MRT_HDR(rec)->subtype);
it->entryCount = beswap16(ents->entryCount);
it->nextIdx = 0;
return OK;
}
Mrtribentv2 *Bgp_NextRibEntryv2(Mrtribiterv2 *it)
{
if (it->ptr >= it->lim) {
if (it->nextIdx == it->entryCount)
Bgp_SetErrStat(BGPENOERR);
else
Bgp_SetErrStat(BGPEBADRIBV2CNT);
return NULL;
}
size_t left = it->lim - it->ptr;
assert(left > 0);
Mrtribentv2 *ent = (Mrtribentv2 *) it->ptr;
size_t offset = 2 + 4; // peer index, originated time
if (it->isAddPath)
offset += 4; // path id
if (left < offset + 2) { // attributes length
Bgp_SetErrStat(BGPETRUNCRIBV2);
return NULL;
}
Bgpattrseg *tpa = (Bgpattrseg *) ((Uint8 *) ent + offset);
offset += 2 + beswap16(tpa->len);
if (left < offset) {
Bgp_SetErrStat(BGPETRUNCRIBV2);
return NULL;
}
Bgp_SetErrStat(BGPENOERR);
it->ptr += offset;
it->nextIdx++;
return ent;
}
Bgp4mphdr *Bgp_GetBgp4mpHdr(Mrtrecord *rec, size_t *nbytes)
{
const Mrthdr *hdr = MRT_HDR(rec);
if (!MRT_ISBGP4MP(hdr->type)) {
Bgp_SetErrStat(BGPEBADMRTTYPE);
return NULL;
}
size_t len = beswap32(hdr->len);
size_t offset = 0;
Afi afi;
Bgp4mphdr *bgp4mp = (Bgp4mphdr *) MRT_DATAPTR(rec);
if (BGP4MP_ISASN32BIT(hdr->subtype)) {
offset += 2 * 4;
offset += 2 + 2;
if (len < offset) {
Bgp_SetErrStat(BGPETRUNCMRT);
return NULL;
}
afi = bgp4mp->a32.afi;
} else {
offset += 2 * 2;
offset += 2 + 2;
if (len < offset) {
Bgp_SetErrStat(BGPETRUNCMRT);
return NULL;
}
afi = bgp4mp->a16.afi;
}
switch (afi) {
case AFI_IP: offset += 2 * IPV4_SIZE; break;
case AFI_IP6: offset += 2 * IPV6_SIZE; break;
default:
Bgp_SetErrStat(BGPEAFIUNSUP);
return NULL;
}
if (BGP4MP_ISSTATECHANGE(hdr->subtype))
offset += 2 * 2;
if (len < offset) {
Bgp_SetErrStat(BGPETRUNCMRT);
return NULL;
}
Bgp_SetErrStat(BGPENOERR);
if (nbytes)
*nbytes = offset;
return bgp4mp;
}
Judgement Bgp_UnwrapBgp4mp(Mrtrecord *rec, Bgpmsg *dest, unsigned flags)
{
const Mrthdr *hdr = MRT_HDR(rec);
if (!MRT_ISBGP4MP(hdr->type))
return Bgp_SetErrStat(BGPEBADMRTTYPE);
if (!BGP4MP_ISMESSAGE(hdr->subtype))
return Bgp_SetErrStat(BGPEBADMRTTYPE);
Uint32 len = beswap32(hdr->len);
Uint8 *base = (Uint8 *) MRT_DATAPTR(rec);
// Skip header
size_t siz = BGP4MP_ISASN32BIT(hdr->subtype) ? 2*4 : 2*2; // skip ASN
siz += 2; // skip interface index
Afi afi;
if (len < siz + sizeof(afi))
return Bgp_SetErrStat(BGPETRUNCMRT);
// Skip AFI and addresses
memcpy(&afi, base + siz, sizeof(afi));
siz += sizeof(afi);
switch (afi) {
case AFI_IP:
siz += 2 * sizeof(Ipv4adr);
break;
case AFI_IP6:
siz += 2 * sizeof(Ipv6adr);
break;
default:
return Bgp_SetErrStat(BGPEAFIUNSUP);
}
if (len < siz)
return Bgp_SetErrStat(BGPETRUNCMRT);
size_t msgsiz = len - siz;
void *buf = base + siz;
// Mask away ignored flags
flags &= ~(BGPF_ADDPATH|BGPF_ASN32BIT);
// ...and automatically reset them as defined by BGP4MP subtype
if (BGP4MP_ISASN32BIT(hdr->subtype))
flags |= BGPF_ASN32BIT;
if (BGP4MP_ISADDPATH(hdr->subtype))
flags |= BGPF_ADDPATH;
// Unwrap BGP message
return Bgp_MsgFromBuf(dest, buf, msgsiz, flags);
}
#define TABLE_DUMP_MINSIZ (2 + 2 /*+ PFX*/ + 1 + 1 + 4 /*+ IP*/ + 2 + 2)
Mrtribent *Bgp_GetMrtRibHdr(Mrtrecord *rec)
{
Mrthdr *hdr = MRT_HDR(rec);
if (hdr->type != MRT_TABLE_DUMP) {
Bgp_SetErrStat(BGPEBADMRTTYPE);
return NULL;
}
size_t len = beswap32(hdr->len);
size_t siz = TABLE_DUMP_MINSIZ - 2; // do not include attribute length
switch (hdr->subtype) {
case AFI_IP: siz += 2 * IPV4_SIZE; break;
case AFI_IP6: siz += 2 * IPV6_SIZE; break;
default:
Bgp_SetErrStat(BGPEAFIUNSUP);
return NULL;
}
if (len < siz + 2) { // include attribute length in size check
Bgp_SetErrStat(BGPETRUNCMRT);
return NULL;
}
// NOTE: TABLE_DUMP has no extended timestamp variant
Mrtribent *ent = (Mrtribent *) (hdr + 1);
Uint16 attrLen;
memcpy(&attrLen, (Uint8 *) ent + siz, sizeof(attrLen));
siz += 2; // now include offset
siz += beswap16(attrLen);
if (len < siz) {
Bgp_SetErrStat(BGPETRUNCMRT);
return NULL;
}
Bgp_SetErrStat(BGPENOERR);
return (Mrtribent *) (hdr + 1);
}
Zebrahdr *Bgp_GetZebraHdr(Mrtrecord *rec, size_t *nbytes)
{
Mrthdr *hdr = MRT_HDR(rec);
if (hdr->type != MRT_BGP) {
Bgp_SetErrStat(BGPEBADMRTTYPE);
return NULL;
}
size_t len = beswap32(hdr->len);
size_t offset = 2 + IPV4_SIZE;
if (ZEBRA_ISMESSAGE(hdr->subtype))
offset += 2 + IPV4_SIZE;
else if (hdr->subtype == ZEBRA_STATE_CHANGE)
offset += 2 * 2;
if (len < offset) {
Bgp_SetErrStat(BGPETRUNCMRT);
return NULL;
}
Bgp_SetErrStat(BGPENOERR);
if (nbytes)
*nbytes = offset;
// NOTE: Legacy ZEBRA type doesn't have extended timestamp variants
return (Zebrahdr *) (hdr + 1);
}
#define ZEBRA_MSGSIZ (2uLL + IPV4_SIZE + 2uLL + IPV4_SIZE)
Judgement Bgp_UnwrapZebra(Mrtrecord *rec, Bgpmsg *dest, unsigned flags)
{
Mrthdr *hdr = MRT_HDR(rec);
if (hdr->type != MRT_BGP)
return Bgp_SetErrStat(BGPEBADMRTTYPE);
// Resolve BGP type from ZEBRA subtype
BgpType type;
switch (hdr->subtype) {
case ZEBRA_UPDATE: type = BGP_UPDATE; break;
case ZEBRA_OPEN: type = BGP_OPEN; break;
case ZEBRA_KEEPALIVE: type = BGP_KEEPALIVE; break;
case ZEBRA_NOTIFY: type = BGP_NOTIFICATION; break;
default: return Bgp_SetErrStat(BGPEBADMRTTYPE);
}
Zebramsghdr *zebra = (Zebramsghdr *) (hdr + 1); // NOTE: ZEBRA doesn't have extended timestamp variants
size_t len = beswap32(hdr->len);
if (len < ZEBRA_MSGSIZ)
return Bgp_SetErrStat(BGPETRUNCMRT);
// ZEBRA dumps don't include BGP message header
size_t zebralen = len - ZEBRA_MSGSIZ;
size_t msglen = BGP_HDRSIZ + zebralen;
// Validate message size
if (msglen > BGP_EXMSGSIZ || (msglen > BGP_MSGSIZ && !BGP_ISEXMSG(flags)))
return Bgp_SetErrStat(BGPEOVRSIZ);
// Allocate new message
const MemOps *ops = BGP_MEMOPS(dest);
Bgphdr *msg = (Bgphdr *) ops->Alloc(dest->allocp, msglen, NULL);
if (!msg)
return Bgp_SetErrStat(BGPENOMEM);
// Build a valid BGP header
memset(msg->marker, 0xff, sizeof(msg->marker));
msg->len = beswap16(msglen);
msg->type = type;
memcpy(msg + 1, zebra->msg, zebralen);
// Populate `dest`
dest->buf = (Uint8 *) msg;
dest->flags = flags & BGPF_EXMSG; // only acceptable flag
BGP_CLRATTRTAB(dest->table);
return Bgp_SetErrStat(BGPENOERR);
}
void Bgp_ClearMrt(Mrtrecord *rec)
{
const MemOps *memOps = MRT_MEMOPS(rec);
memOps->Free(rec->allocp, rec->buf);
memOps->Free(rec->allocp, rec->peerOffTab);
rec->buf = NULL;
rec->peerOffTab = NULL;
}