void
ospf_lsack_receive(struct ospf_packet *ps_i, struct ospf_iface *ifa,
struct ospf_neighbor *n)
{
struct proto *p = &ifa->oa->po->proto;
struct ospf_lsa_header lsa;
struct top_hash_entry *en;
unsigned int i, lsano;
unsigned int size = ntohs(ps_i->length);
if (size < sizeof(struct ospf_lsack_packet))
{
log(L_ERR "Bad OSPF LSACK packet from %I - too short (%u B)", n->ip, size);
return;
}
struct ospf_lsack_packet *ps = (void *) ps_i;
OSPF_PACKET(ospf_dump_lsack, ps, "LSACK packet received from %I via %s", n->ip, ifa->iface->name);
ospf_neigh_sm(n, INM_HELLOREC);
if (n->state < NEIGHBOR_EXCHANGE)
return;
lsano = (size - sizeof(struct ospf_lsack_packet)) /
sizeof(struct ospf_lsa_header);
for (i = 0; i < lsano; i++)
{
ntohlsah(ps->lsh + i, &lsa);
u32 dom = ospf_lsa_domain(lsa.type, n->ifa);
if ((en = ospf_hash_find_header(n->lsrth, dom, &lsa)) == NULL)
continue; /* pg 155 */
if (lsa_comp(&lsa, &en->lsa) != CMP_SAME) /* pg 156 */
{
if ((lsa.sn == LSA_MAXSEQNO) && (lsa.age == LSA_MAXAGE))
continue;
OSPF_TRACE(D_PACKETS, "Strange LSACK from %I", n->ip);
OSPF_TRACE(D_PACKETS, "Type: %04x, Id: %R, Rt: %R",
lsa.type, lsa.id, lsa.rt);
OSPF_TRACE(D_PACKETS, "I have: Age: %4u, Seq: %08x, Sum: %04x",
en->lsa.age, en->lsa.sn, en->lsa.checksum);
OSPF_TRACE(D_PACKETS, "He has: Age: %4u, Seq: %08x, Sum: %04x",
lsa.age, lsa.sn, lsa.checksum);
continue;
}
DBG("Deleting LS Id: %R RT: %R Type: %u from LS Retl for neighbor %R\n",
lsa.id, lsa.rt, lsa.type, n->rid);
s_rem_node(SNODE en);
if (en->lsa_body != NULL)
mb_free(en->lsa_body);
en->lsa_body = NULL;
ospf_hash_delete(n->lsrth, en);
}
}
void ospf_rxmt_dbdes(struct ospf_proto *p, struct ospf_neighbor *n)
{
ASSERT(n->state > NEIGHBOR_EXSTART);
if (!n->ldd_buffer) {
log(L_WARN "%s: No DBDES packet for retransmit", p->p.name);
ospf_neigh_sm(n, INM_SEQMIS);
return;
}
/* Send last packet */
ospf_do_send_dbdes(p, n);
}
void
ospf_receive_dbdes(struct ospf_packet *pkt, struct ospf_iface *ifa,
struct ospf_neighbor *n)
{
struct ospf_proto *p = ifa->oa->po;
const char *err_dsc = NULL;
u32 rcv_ddseq, rcv_options;
u16 rcv_iface_mtu;
u8 rcv_imms;
uint plen, err_val = 0;
/* RFC 2328 10.6 */
plen = ntohs(pkt->length);
if (plen < ospf_dbdes_hdrlen(p))
{
LOG_PKT("Bad DBDES packet from nbr %R on %s - %s (%u)", n->rid, ifa->ifname, "too short", plen);
return;
}
OSPF_PACKET(ospf_dump_dbdes, pkt, "DBDES packet received from nbr %R on %s", n->rid, ifa->ifname);
ospf_neigh_sm(n, INM_HELLOREC);
if (ospf_is_v2(p))
{
struct ospf_dbdes2_packet *ps = (void *) pkt;
rcv_iface_mtu = ntohs(ps->iface_mtu);
rcv_options = ps->options;
rcv_imms = ps->imms;
rcv_ddseq = ntohl(ps->ddseq);
}
else /* OSPFv3 */
{
struct ospf_dbdes3_packet *ps = (void *) pkt;
rcv_options = ntohl(ps->options);
rcv_iface_mtu = ntohs(ps->iface_mtu);
rcv_imms = ps->imms;
rcv_ddseq = ntohl(ps->ddseq);
}
switch (n->state)
{
case NEIGHBOR_DOWN:
case NEIGHBOR_ATTEMPT:
case NEIGHBOR_2WAY:
OSPF_TRACE(D_PACKETS, "DBDES packet ignored - lesser state than ExStart");
return;
case NEIGHBOR_INIT:
ospf_neigh_sm(n, INM_2WAYREC);
if (n->state != NEIGHBOR_EXSTART)
return;
case NEIGHBOR_EXSTART:
if ((ifa->type != OSPF_IT_VLINK) &&
(rcv_iface_mtu != ifa->iface->mtu) &&
(rcv_iface_mtu != 0) &&
(ifa->iface->mtu != 0))
LOG_PKT_WARN("MTU mismatch with nbr %R on %s (remote %d, local %d)",
n->rid, ifa->ifname, rcv_iface_mtu, ifa->iface->mtu);
if ((rcv_imms == DBDES_IMMS) &&
(n->rid > p->router_id) &&
(plen == ospf_dbdes_hdrlen(p)))
{
/* I'm slave! */
n->dds = rcv_ddseq;
n->ddr = rcv_ddseq;
n->options = rcv_options;
n->myimms &= ~DBDES_MS;
n->imms = rcv_imms;
tm_stop(n->dbdes_timer);
ospf_neigh_sm(n, INM_NEGDONE);
ospf_send_dbdes(p, n);
break;
}
if (!(rcv_imms & DBDES_I) &&
!(rcv_imms & DBDES_MS) &&
(n->rid < p->router_id) &&
(n->dds == rcv_ddseq))
{
/* I'm master! */
n->options = rcv_options;
n->ddr = rcv_ddseq - 1; /* It will be set corectly a few lines down */
n->imms = rcv_imms;
ospf_neigh_sm(n, INM_NEGDONE);
/* Continue to the NEIGHBOR_EXCHANGE case */
}
else
{
DBG("%s: Nothing happend to %I (imms=%d)\n", p->name, n->ip, rcv_imms);
break;
}
case NEIGHBOR_EXCHANGE:
if ((rcv_imms == n->imms) &&
(rcv_options == n->options) &&
(rcv_ddseq == n->ddr))
goto duplicate;
if ((rcv_imms & DBDES_MS) != (n->imms & DBDES_MS))
DROP("MS-bit mismatch", rcv_imms);
if (rcv_imms & DBDES_I)
DROP("I-bit mismatch", rcv_imms);
if (rcv_options != n->options)
DROP("options mismatch", rcv_options);
n->ddr = rcv_ddseq;
n->imms = rcv_imms;
if (n->myimms & DBDES_MS)
{
/* MASTER */
if (rcv_ddseq != n->dds)
DROP("DD sequence number mismatch", rcv_ddseq);
n->dds++;
if (ospf_process_dbdes(p, pkt, n) < 0)
return;
if (!(n->myimms & DBDES_M) && !(n->imms & DBDES_M))
{
tm_stop(n->dbdes_timer);
ospf_neigh_sm(n, INM_EXDONE);
break;
}
ospf_send_dbdes(p, n);
tm_start(n->dbdes_timer, n->ifa->rxmtint);
}
else
{
/* SLAVE */
if (rcv_ddseq != (n->dds + 1))
DROP("DD sequence number mismatch", rcv_ddseq);
n->ddr = rcv_ddseq;
n->dds = rcv_ddseq;
if (ospf_process_dbdes(p, pkt, n) < 0)
return;
ospf_send_dbdes(p, n);
if (!(n->myimms & DBDES_M) && !(n->imms & DBDES_M))
ospf_neigh_sm(n, INM_EXDONE);
}
break;
case NEIGHBOR_LOADING:
case NEIGHBOR_FULL:
if ((rcv_imms == n->imms) &&
(rcv_options == n->options) &&
(rcv_ddseq == n->ddr))
goto duplicate;
DROP("too late for DD exchange", n->state);
default:
bug("Undefined interface state");
}
return;
duplicate:
OSPF_TRACE(D_PACKETS, "DBDES packet is duplicate");
/* Slave should retransmit DBDES packet */
if (!(n->myimms & DBDES_MS))
ospf_rxmt_dbdes(p, n);
return;
drop:
LOG_PKT("Bad DBDES packet from nbr %R on %s - %s (%u)",
n->rid, ifa->ifname, err_dsc, err_val);
ospf_neigh_sm(n, INM_SEQMIS);
return;
}
static int
ospf_process_dbdes(struct ospf_proto *p, struct ospf_packet *pkt, struct ospf_neighbor *n)
{
struct ospf_iface *ifa = n->ifa;
struct ospf_lsa_header *lsas, lsa;
struct top_hash_entry *en, *req;
const char *err_dsc = NULL;
u32 lsa_type, lsa_domain;
uint i, lsa_count;
ospf_dbdes_body(p, pkt, &lsas, &lsa_count);
for (i = 0; i < lsa_count; i++)
{
lsa_ntoh_hdr(lsas + i, &lsa);
lsa_get_type_domain(&lsa, ifa, &lsa_type, &lsa_domain);
/* RFC 2328 10.6 and RFC 5340 4.2.2 */
if (!lsa_type)
DROP1("LSA of unknown type");
if (!oa_is_ext(ifa->oa) && (LSA_SCOPE(lsa_type) == LSA_SCOPE_AS))
DROP1("LSA with AS scope in stub area");
/* Errata 3746 to RFC 2328 - rt-summary-LSAs forbidden in stub areas */
if (!oa_is_ext(ifa->oa) && (lsa_type == LSA_T_SUM_RT))
DROP1("rt-summary-LSA in stub area");
/* Not explicitly mentioned in RFC 5340 4.2.2 but makes sense */
if (LSA_SCOPE(lsa_type) == LSA_SCOPE_RES)
DROP1("LSA with invalid scope");
en = ospf_hash_find(p->gr, lsa_domain, lsa.id, lsa.rt, lsa_type);
if (!en || (lsa_comp(&lsa, &(en->lsa)) == CMP_NEWER))
{
/* This should be splitted to ospf_lsa_lsrq_up() */
req = ospf_hash_get(n->lsrqh, lsa_domain, lsa.id, lsa.rt, lsa_type);
if (!SNODE_VALID(req))
s_add_tail(&n->lsrql, SNODE req);
if (!SNODE_VALID(n->lsrqi))
n->lsrqi = req;
req->lsa = lsa;
req->lsa_body = LSA_BODY_DUMMY;
if (!tm_active(n->lsrq_timer))
tm_start(n->lsrq_timer, 0);
}
}
return 0;
drop:
LOG_LSA1("Bad LSA (Type: %04x, Id: %R, Rt: %R) in DBDES", lsa_type, lsa.id, lsa.rt);
LOG_LSA2(" received from nbr %R on %s - %s", n->rid, ifa->ifname, err_dsc);
ospf_neigh_sm(n, INM_SEQMIS);
return -1;
}
/**
* ospf_dbdes_send - transmit database description packet
* @n: neighbor
* @next: whether to send a next packet in a sequence (1) or to retransmit the old one (0)
*
* Sending of a database description packet is described in 10.8 of RFC 2328.
* Reception of each packet is acknowledged in the sequence number of another.
* When I send a packet to a neighbor I keep a copy in a buffer. If the neighbor
* does not reply, I don't create a new packet but just send the content
* of the buffer.
*/
void
ospf_dbdes_send(struct ospf_neighbor *n, int next)
{
struct ospf_dbdes_packet *pkt;
struct ospf_packet *op;
struct ospf_iface *ifa = n->ifa;
struct ospf_area *oa = ifa->oa;
struct proto_ospf *po = oa->po;
struct proto *p = &po->proto;
u16 length, i, j;
/* FIXME ??? */
if ((oa->rt == NULL) || (EMPTY_LIST(po->lsal)))
update_rt_lsa(oa);
switch (n->state)
{
case NEIGHBOR_EXSTART: /* Send empty packets */
n->myimms.bit.i = 1;
pkt = ospf_tx_buffer(ifa);
op = &pkt->ospf_packet;
ospf_pkt_fill_hdr(ifa, pkt, DBDES_P);
pkt->iface_mtu = (ifa->type == OSPF_IT_VLINK) ? 0 : htons(ifa->iface->mtu);
pkt->options = hton_opt(oa->options);
pkt->imms = n->myimms;
pkt->ddseq = htonl(n->dds);
length = sizeof(struct ospf_dbdes_packet);
op->length = htons(length);
OSPF_PACKET(ospf_dump_dbdes, pkt, "DBDES packet sent to %I via %s", n->ip, ifa->iface->name);
ospf_send_to(ifa, n->ip);
break;
case NEIGHBOR_EXCHANGE:
n->myimms.bit.i = 0;
if (next)
{
snode *sn;
struct ospf_lsa_header *lsa;
pkt = n->ldbdes;
op = (struct ospf_packet *) pkt;
ospf_pkt_fill_hdr(ifa, pkt, DBDES_P);
pkt->iface_mtu = (ifa->type == OSPF_IT_VLINK) ? 0 : htons(ifa->iface->mtu);
pkt->ddseq = htonl(n->dds);
pkt->options = hton_opt(oa->options);
j = i = (ospf_pkt_maxsize(ifa) - sizeof(struct ospf_dbdes_packet)) / sizeof(struct ospf_lsa_header); /* Number of possible lsaheaders to send */
lsa = (n->ldbdes + sizeof(struct ospf_dbdes_packet));
if (n->myimms.bit.m)
{
sn = s_get(&(n->dbsi));
DBG("Number of LSA: %d\n", j);
for (; i > 0; i--)
{
struct top_hash_entry *en= (struct top_hash_entry *) sn;
if (ospf_lsa_flooding_allowed(&en->lsa, en->domain, ifa))
{
htonlsah(&(en->lsa), lsa);
DBG("Working on: %d\n", i);
DBG("\tX%01x %-1R %-1R %p\n", en->lsa.type, en->lsa.id, en->lsa.rt, en->lsa_body);
lsa++;
}
else i++; /* No lsa added */
if (sn == STAIL(po->lsal))
{
i--;
break;
}
sn = sn->next;
}
if (sn == STAIL(po->lsal))
{
DBG("Number of LSA NOT sent: %d\n", i);
DBG("M bit unset.\n");
n->myimms.bit.m = 0; /* Unset more bit */
}
s_put(&(n->dbsi), sn);
}
pkt->imms.byte = n->myimms.byte;
length = (j - i) * sizeof(struct ospf_lsa_header) +
sizeof(struct ospf_dbdes_packet);
op->length = htons(length);
DBG("%s: DB_DES (M) prepared for %I.\n", p->name, n->ip);
}
case NEIGHBOR_LOADING:
case NEIGHBOR_FULL:
length = ntohs(((struct ospf_packet *) n->ldbdes)->length);
if (!length)
{
OSPF_TRACE(D_PACKETS, "No packet in my buffer for repeating");
ospf_neigh_sm(n, INM_KILLNBR);
return;
}
/* Copy last sent packet again */
pkt = ospf_tx_buffer(ifa);
memcpy(pkt, n->ldbdes, length);
OSPF_PACKET(ospf_dump_dbdes, pkt, "DBDES packet sent to %I via %s", n->ip, ifa->iface->name);
ospf_send_to(ifa, n->ip);
if(n->myimms.bit.ms) tm_start(n->rxmt_timer, n->ifa->rxmtint); /* Restart timer */
if (!n->myimms.bit.ms)
{
if ((n->myimms.bit.m == 0) && (n->imms.bit.m == 0) &&
(n->state == NEIGHBOR_EXCHANGE))
{
ospf_neigh_sm(n, INM_EXDONE);
}
}
break;
default: /* Ignore it */
break;
}
}
void
ospf_dbdes_receive(struct ospf_packet *ps_i, struct ospf_iface *ifa,
struct ospf_neighbor *n)
{
struct proto_ospf *po = ifa->oa->po;
struct proto *p = &po->proto;
unsigned int size = ntohs(ps_i->length);
if (size < sizeof(struct ospf_dbdes_packet))
{
log(L_ERR "Bad OSPF DBDES packet from %I - too short (%u B)", n->ip, size);
return;
}
struct ospf_dbdes_packet *ps = (void *) ps_i;
u32 ps_ddseq = ntohl(ps->ddseq);
u32 ps_options = ntoh_opt(ps->options);
u16 ps_iface_mtu = ntohs(ps->iface_mtu);
OSPF_PACKET(ospf_dump_dbdes, ps, "DBDES packet received from %I via %s", n->ip, ifa->iface->name);
ospf_neigh_sm(n, INM_HELLOREC);
switch (n->state)
{
case NEIGHBOR_DOWN:
case NEIGHBOR_ATTEMPT:
case NEIGHBOR_2WAY:
return;
break;
case NEIGHBOR_INIT:
ospf_neigh_sm(n, INM_2WAYREC);
if (n->state != NEIGHBOR_EXSTART)
return;
case NEIGHBOR_EXSTART:
if ((ps_iface_mtu != ifa->iface->mtu) && (ifa->type != OSPF_IT_VLINK)
&& (ps_iface_mtu != 0) && (ifa->iface->mtu != 0))
log(L_WARN "OSPF: MTU mismatch with neighbour %I on interface %s (remote %d, local %d)",
n->ip, ifa->iface->name, ps_iface_mtu, ifa->iface->mtu);
if ((ps->imms.bit.m && ps->imms.bit.ms && ps->imms.bit.i)
&& (n->rid > po->router_id) && (size == sizeof(struct ospf_dbdes_packet)))
{
/* I'm slave! */
n->dds = ps_ddseq;
n->ddr = ps_ddseq;
n->options = ps_options;
n->myimms.bit.ms = 0;
n->imms.byte = ps->imms.byte;
OSPF_TRACE(D_PACKETS, "I'm slave to %I.", n->ip);
ospf_neigh_sm(n, INM_NEGDONE);
ospf_dbdes_send(n, 1);
break;
}
if (((ps->imms.bit.i == 0) && (ps->imms.bit.ms == 0)) &&
(n->rid < po->router_id) && (n->dds == ps_ddseq))
{
/* I'm master! */
n->options = ps_options;
n->ddr = ps_ddseq - 1; /* It will be set corectly a few lines down */
n->imms.byte = ps->imms.byte;
OSPF_TRACE(D_PACKETS, "I'm master to %I.", n->ip);
ospf_neigh_sm(n, INM_NEGDONE);
}
else
{
DBG("%s: Nothing happend to %I (imms=%u)\n", p->name, n->ip,
ps->imms.byte);
break;
}
case NEIGHBOR_EXCHANGE:
if ((ps->imms.byte == n->imms.byte) && (ps_options == n->options) &&
(ps_ddseq == n->ddr))
{
/* Duplicate packet */
OSPF_TRACE(D_PACKETS, "Received duplicate dbdes from %I.", n->ip);
if (n->myimms.bit.ms == 0)
{
/* Slave should retransmit dbdes packet */
ospf_dbdes_send(n, 0);
}
return;
}
n->ddr = ps_ddseq;
if (ps->imms.bit.ms != n->imms.bit.ms) /* M/S bit differs */
{
OSPF_TRACE(D_PACKETS, "dbdes - sequence mismatch neighbor %I (bit MS)",
n->ip);
ospf_neigh_sm(n, INM_SEQMIS);
break;
}
if (ps->imms.bit.i) /* I bit is set */
{
OSPF_TRACE(D_PACKETS, "dbdes - sequence mismatch neighbor %I (bit I)",
n->ip);
ospf_neigh_sm(n, INM_SEQMIS);
break;
}
n->imms.byte = ps->imms.byte;
if (ps_options != n->options) /* Options differs */
{
OSPF_TRACE(D_PACKETS, "dbdes - sequence mismatch neighbor %I (options)",
n->ip);
ospf_neigh_sm(n, INM_SEQMIS);
break;
}
if (n->myimms.bit.ms)
{
if (ps_ddseq != n->dds) /* MASTER */
{
OSPF_TRACE(D_PACKETS,
"dbdes - sequence mismatch neighbor %I (master)", n->ip);
ospf_neigh_sm(n, INM_SEQMIS);
break;
}
n->dds++;
DBG("Incrementing dds\n");
ospf_dbdes_reqladd(ps, n);
if ((n->myimms.bit.m == 0) && (ps->imms.bit.m == 0))
{
ospf_neigh_sm(n, INM_EXDONE);
}
else
{
ospf_dbdes_send(n, 1);
}
}
else
{
if (ps_ddseq != (n->dds + 1)) /* SLAVE */
{
OSPF_TRACE(D_PACKETS, "dbdes - sequence mismatch neighbor %I (slave)",
n->ip);
ospf_neigh_sm(n, INM_SEQMIS);
break;
}
n->ddr = ps_ddseq;
n->dds = ps_ddseq;
ospf_dbdes_reqladd(ps, n);
ospf_dbdes_send(n, 1);
}
break;
case NEIGHBOR_LOADING:
case NEIGHBOR_FULL:
if ((ps->imms.byte == n->imms.byte) && (ps_options == n->options)
&& (ps_ddseq == n->ddr))
/* Only duplicate are accepted */
{
OSPF_TRACE(D_PACKETS, "Received duplicate dbdes from %I.", n->ip);
if (n->myimms.bit.ms == 0)
{
/* Slave should retransmit dbdes packet */
ospf_dbdes_send(n, 0);
}
return;
}
else
{
OSPF_TRACE(D_PACKETS, "dbdes - sequence mismatch neighbor %I (full)",
n->ip);
DBG("PS=%u, DDR=%u, DDS=%u\n", ps_ddseq, n->ddr, n->dds);
ospf_neigh_sm(n, INM_SEQMIS);
}
break;
default:
bug("Received dbdes from %I in undefined state.", n->ip);
}
}
