bird/proto/ospf/lsreq.c
Ondrej Zajicek (work) 5a50a98980 OSPF: Opaque LSAs and Router Information LSA
Add support for OSPFv2 Opaque LSAs (RFC 5250) and for Router Information
LSA (RFC 7770). The second part is here mainly for testing opaque LSAs.
2019-01-24 22:45:27 +01:00

146 lines
3.5 KiB
C

/*
* BIRD -- OSPF
*
* (c) 2000--2004 Ondrej Filip <feela@network.cz>
* (c) 2009--2014 Ondrej Zajicek <santiago@crfreenet.org>
* (c) 2009--2014 CZ.NIC z.s.p.o.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "ospf.h"
/*
struct ospf_lsreq_packet
{
struct ospf_packet hdr;
// union ospf_auth auth;
struct ospf_lsreq_header lsrs[];
};
*/
static inline void
ospf_lsreq_body(struct ospf_proto *p, struct ospf_packet *pkt,
struct ospf_lsreq_header **body, uint *count)
{
uint plen = ntohs(pkt->length);
uint hlen = ospf_pkt_hdrlen(p);
*body = ((void *) pkt) + hlen;
*count = (plen - hlen) / sizeof(struct ospf_lsreq_header);
}
static void
ospf_dump_lsreq(struct ospf_proto *p, struct ospf_packet *pkt)
{
struct ospf_lsreq_header *lsrs;
uint i, lsr_count;
ASSERT(pkt->type == LSREQ_P);
ospf_dump_common(p, pkt);
ospf_lsreq_body(p, pkt, &lsrs, &lsr_count);
for (i = 0; i < lsr_count; i++)
log(L_TRACE "%s: LSR Type: %04x, Id: %R, Rt: %R", p->p.name,
ntohl(lsrs[i].type), ntohl(lsrs[i].id), ntohl(lsrs[i].rt));
}
void
ospf_send_lsreq(struct ospf_proto *p, struct ospf_neighbor *n)
{
struct ospf_iface *ifa = n->ifa;
struct ospf_lsreq_header *lsrs;
struct top_hash_entry *req;
struct ospf_packet *pkt;
uint i, lsr_max, length;
/* RFC 2328 10.9 */
/* ASSERT((n->state >= NEIGHBOR_EXCHANGE) && !EMPTY_SLIST(n->lsrql)); */
pkt = ospf_tx_buffer(ifa);
ospf_pkt_fill_hdr(ifa, pkt, LSREQ_P);
ospf_lsreq_body(p, pkt, &lsrs, &lsr_max);
i = 0;
WALK_SLIST(req, n->lsrql)
{
if (i == lsr_max)
break;
DBG("Requesting %uth LSA: Type: %04u, ID: %R, RT: %R, SN: 0x%x, Age %u\n",
i, req->lsa_type, req->lsa.id, req->lsa.rt, req->lsa.sn, req->lsa.age);
u32 etype = lsa_get_etype(&req->lsa, p);
lsrs[i].type = htonl(etype);
lsrs[i].rt = htonl(req->lsa.rt);
lsrs[i].id = htonl(req->lsa.id);
i++;
}
/* We store the position to see whether requested LSAs have been received */
n->lsrqi = req;
length = ospf_pkt_hdrlen(p) + i * sizeof(struct ospf_lsreq_header);
pkt->length = htons(length);
OSPF_PACKET(ospf_dump_lsreq, pkt, "LSREQ packet sent to nbr %R on %s", n->rid, ifa->ifname);
ospf_send_to(ifa, n->ip);
}
void
ospf_receive_lsreq(struct ospf_packet *pkt, struct ospf_iface *ifa,
struct ospf_neighbor *n)
{
struct ospf_proto *p = ifa->oa->po;
struct ospf_lsreq_header *lsrs;
uint i, lsr_count;
/* RFC 2328 10.7 */
/* No need to check length, lsreq has only basic header */
OSPF_PACKET(ospf_dump_lsreq, pkt, "LSREQ packet received from nbr %R on %s", n->rid, ifa->ifname);
if (n->state < NEIGHBOR_EXCHANGE)
{
OSPF_TRACE(D_PACKETS, "LSREQ packet ignored - lesser state than Exchange");
return;
}
ospf_neigh_sm(n, INM_HELLOREC); /* Not in RFC */
ospf_lsreq_body(p, pkt, &lsrs, &lsr_count);
struct top_hash_entry *en, *entries[lsr_count];
for (i = 0; i < lsr_count; i++)
{
u32 id, rt, type, domain;
id = ntohl(lsrs[i].id);
rt = ntohl(lsrs[i].rt);
lsa_get_type_domain_(ntohl(lsrs[i].type), id, ifa, &type, &domain);
DBG("Processing requested LSA: Type: %04x, Id: %R, Rt: %R\n", type, id, rt);
en = ospf_hash_find(p->gr, domain, id, rt, type);
if (!en)
{
LOG_LSA1("Bad LSR (Type: %04x, Id: %R, Rt: %R) in LSREQ", type, id, rt);
LOG_LSA2(" received from nbr %R on %s - LSA is missing", n->rid, ifa->ifname);
ospf_neigh_sm(n, INM_BADLSREQ);
return;
}
entries[i] = en;
}
ospf_send_lsupd(p, entries, lsr_count, n);
}