#define BIT32_CLR(b,p) ((b)[(p)/32] &= ~BIT32_VAL(p))
#define BIT32_ZERO(b,l) memset((b), 0, (l)/8)
+/* The same, but counting bits from MSB */
+#define BIT32R_VAL(p) ((((u32) 1) << 31) >> ((p) % 32))
+#define BIT32R_TEST(b,p) ((b)[(p)/32] & BIT32R_VAL(p))
+#define BIT32R_SET(b,p) ((b)[(p)/32] |= BIT32R_VAL(p))
+#define BIT32R_CLR(b,p) ((b)[(p)/32] &= ~BIT32R_VAL(p))
+#define BIT32R_ZERO(b,l) memset((b), 0, (l)/8)
+
#ifndef NULL
#define NULL ((void *) 0)
#endif
{
struct ospf_dbdes2_packet *ps = (void *) pkt;
ps->iface_mtu = htons(iface_mtu);
- ps->options = ifa->oa->options;
+ ps->options = ifa->oa->options | OPT_O;
ps->imms = 0; /* Will be set later */
ps->ddseq = htonl(n->dds);
length = sizeof(struct ospf_dbdes2_packet);
}
if ((en->lsa.age < LSA_MAXAGE) &&
- lsa_flooding_allowed(en->lsa_type, en->domain, ifa))
+ lsa_flooding_allowed(en->lsa_type, en->domain, ifa) &&
+ lsa_is_acceptable(en->lsa_type, n, p))
{
lsa_hton_hdr(&(en->lsa), lsas + i);
i++;
}
}
+int
+lsa_is_acceptable(u32 type, struct ospf_neighbor *n, struct ospf_proto *p)
+{
+ if (ospf_is_v2(p))
+ {
+ if (type == LSA_T_NSSA)
+ return !!(n->options & OPT_N);
+
+ if (lsa_is_opaque(type))
+ return !!(n->options & OPT_O);
+
+ return 1;
+ }
+ else
+ {
+ /*
+ * There should be check whether receiving router understands that type
+ * of LSA (for LSA types with U-bit == 0). But as we do not support any
+ * optional LSA types, this is not needed yet.
+ */
+
+ return 1;
+ }
+}
static int
unknown_lsa_type(u32 type)
case LSA_T_NSSA:
case LSA_T_LINK:
case LSA_T_PREFIX:
+ case LSA_T_RI_LINK:
+ case LSA_T_RI_AREA:
+ case LSA_T_RI_AS:
return 0;
default:
}
}
-#define LSA_V2_TMAX 8
-static const u16 lsa_v2_types[LSA_V2_TMAX] =
- {0, LSA_T_RT, LSA_T_NET, LSA_T_SUM_NET, LSA_T_SUM_RT, LSA_T_EXT, 0, LSA_T_NSSA};
+/* Maps OSPFv2 types to OSPFv3 types */
+static const u16 lsa_v2_types[] = {
+ 0, LSA_T_RT, LSA_T_NET, LSA_T_SUM_NET, LSA_T_SUM_RT, LSA_T_EXT, 0, LSA_T_NSSA,
+ 0, LSA_T_OPAQUE_LINK, LSA_T_OPAQUE_AREA, LSA_T_OPAQUE_AS
+};
+
+/* Maps OSPFv2 opaque types to OSPFv3 function codes */
+static const u16 opaque_lsa_types[] = {
+ [LSA_OT_RI] = LSA_T_RI_,
+};
+
+/* Maps (subset of) OSPFv3 function codes to OSPFv2 opaque types */
+static const u8 opaque_lsa_types_inv[] = {
+ [LSA_T_RI_] = LSA_OT_RI,
+};
+
+#define LOOKUP(a, i) ({ uint _i = (i); (_i < ARRAY_SIZE(a)) ? a[_i] : 0; })
void
-lsa_get_type_domain_(u32 itype, struct ospf_iface *ifa, u32 *otype, u32 *domain)
+lsa_get_type_domain_(u32 type, u32 id, struct ospf_iface *ifa, u32 *otype, u32 *domain)
{
if (ospf_is_v2(ifa->oa->po))
{
- itype = itype & LSA_T_V2_MASK;
- itype = (itype < LSA_V2_TMAX) ? lsa_v2_types[itype] : 0;
+ type = type & LSA_T_V2_MASK;
+ type = LOOKUP(lsa_v2_types, type);
+
+ uint code;
+ if (LSA_FUNCTION(type) == LSA_T_OPAQUE_)
+ if (code = LOOKUP(opaque_lsa_types, id >> 24))
+ type = code | LSA_UBIT | LSA_SCOPE(type);
}
else
{
/* For unkown LSAs without U-bit change scope to LSA_SCOPE_LINK */
- if (unknown_lsa_type(itype) && !(itype & LSA_UBIT))
- itype = itype & ~LSA_SCOPE_MASK;
+ if (unknown_lsa_type(type) && !(type & LSA_UBIT))
+ type = type & ~LSA_SCOPE_MASK;
}
- *otype = itype;
+ *otype = type;
- switch (LSA_SCOPE(itype))
+ switch (LSA_SCOPE(type))
{
case LSA_SCOPE_LINK:
*domain = ifa->iface_id;
}
}
+u32
+lsa_get_opaque_type(u32 type)
+{
+ return LOOKUP(opaque_lsa_types_inv, LSA_FUNCTION(type));
+}
+
void
lsa_generate_checksum(struct ospf_lsa_header *lsa, const u8 *body)
return lsa_validate_pxlist(lsa, body->pxcount, sizeof(struct ospf_lsa_prefix), (u8 *) body);
}
+static int
+lsa_validate_ri(struct ospf_lsa_header *lsa UNUSED, struct ospf_lsa_net *body UNUSED)
+{
+ /*
+ * There should be proper validation. But we do not really process RI LSAs, so
+ * we can just accept them like another unknown opaque LSAs.
+ */
+
+ return 1;
+}
+
/**
* lsa_validate - check whether given LSA is valid
case LSA_T_EXT:
case LSA_T_NSSA:
return lsa_validate_ext2(lsa, body);
+ case LSA_T_RI_LINK:
+ case LSA_T_RI_AREA:
+ case LSA_T_RI_AS:
+ return lsa_validate_ri(lsa, body);
+ case LSA_T_OPAQUE_LINK:
+ case LSA_T_OPAQUE_AREA:
+ case LSA_T_OPAQUE_AS:
+ return 1; /* Unknown Opaque LSAs */
default:
return 0; /* Should not happen, unknown LSAs are already rejected */
}
return lsa_validate_link(lsa, body);
case LSA_T_PREFIX:
return lsa_validate_prefix(lsa, body);
+ case LSA_T_RI_LINK:
+ case LSA_T_RI_AREA:
+ case LSA_T_RI_AS:
+ return lsa_validate_ri(lsa, body);
default:
return 1; /* Unknown LSAs are OK in OSPFv3 */
}
};
-void lsa_get_type_domain_(u32 itype, struct ospf_iface *ifa, u32 *otype, u32 *domain);
+void lsa_get_type_domain_(u32 type, u32 id, struct ospf_iface *ifa, u32 *otype, u32 *domain);
static inline void lsa_get_type_domain(struct ospf_lsa_header *lsa, struct ospf_iface *ifa, u32 *otype, u32 *domain)
-{ lsa_get_type_domain_(lsa->type_raw, ifa, otype, domain); }
+{ lsa_get_type_domain_(lsa->type_raw, lsa->id, ifa, otype, domain); }
static inline u32 lsa_get_etype(struct ospf_lsa_header *h, struct ospf_proto *p)
{ return ospf_is_v2(p) ? (h->type_raw & LSA_T_V2_MASK) : h->type_raw; }
+/* Assuming OSPFv2 - All U-bit LSAs are mapped to Opaque LSAs */
+static inline int lsa_is_opaque(u32 type)
+{ return !!(type & LSA_UBIT); }
+u32 lsa_get_opaque_type(u32 type);
int lsa_flooding_allowed(u32 type, u32 domain, struct ospf_iface *ifa);
+int lsa_is_acceptable(u32 type, struct ospf_neighbor *n, struct ospf_proto *p);
void lsa_generate_checksum(struct ospf_lsa_header *lsa, const u8 *body);
u16 lsa_verify_checksum(const void *lsa_n, int lsa_len);
id = ntohl(lsrs[i].id);
rt = ntohl(lsrs[i].rt);
- lsa_get_type_domain_(ntohl(lsrs[i].type), ifa, &type, &domain);
+ 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);
WALK_SLIST(en, p->lsal)
if ((en->lsa.age == LSA_MAXAGE) && (en->lsa_body != NULL) &&
- lsa_flooding_allowed(en->lsa_type, en->domain, n->ifa))
+ lsa_flooding_allowed(en->lsa_type, en->domain, n->ifa) &&
+ lsa_is_acceptable(en->lsa_type, n, p))
ospf_lsa_lsrt_up(en, n);
/* If we found any flushed LSA, we send them ASAP */
if (n == from)
continue;
- /* In OSPFv3, there should be check whether receiving router understand
- that type of LSA (for LSA types with U-bit == 0). But as we do not support
- any optional LSA types, this is not needed yet */
+ /* Check whether optional LSAs are supported by neighbor */
+ if (!lsa_is_acceptable(en->lsa_type, n, p))
+ continue;
/* 13.3 (1d) - add LSA to the link state retransmission list */
ospf_lsa_lsrt_up(en, n);
* - RFC 2328 - main OSPFv2 standard
* - RFC 5340 - main OSPFv3 standard
* - RFC 3101 - OSPFv2 NSSA areas
+ * - RFC 5250 - OSPFv2 Opaque LSAs
* - RFC 5709 - OSPFv2 HMAC-SHA Cryptographic Authentication
* - RFC 5838 - OSPFv3 Support of Address Families
* - RFC 6549 - OSPFv2 Multi-Instance Extensions
* - RFC 6987 - OSPF Stub Router Advertisement
* - RFC 7166 - OSPFv3 Authentication Trailer
+ * - RFC 7770 - OSPF Router Information LSA
*/
#include <stdlib.h>
p->rfc1583 = c->rfc1583;
p->stub_router = c->stub_router;
p->merge_external = c->merge_external;
+ p->instance_id = c->instance_id;
p->asbr = c->asbr;
p->ecmp = c->ecmp;
p->tick = c->tick;
if (p->rfc1583 != new->rfc1583)
return 0;
+ if (p->instance_id != new->instance_id)
+ return 0;
+
if (old->abr != new->abr)
return 0;
u8 rfc1583; /* RFC1583 compatibility */
u8 stub_router; /* Do not forward transit traffic */
u8 merge_external; /* Should i merge external routes? */
+ u8 instance_id; /* Differentiate between more OSPF instances */
u8 asbr; /* May i originate any ext/NSSA lsa? */
u8 ecmp; /* Maximal number of nexthops in ECMP route, or 0 */
u64 csn64; /* Last used cryptographic sequence number */
#define OPT_L_V2 0x0010 /* OSPFv2, link-local signaling, not used */
#define OPT_R 0x0010 /* OSPFv3, originator is active router */
#define OPT_DC 0x0020 /* Related to demand circuits, not used */
+#define OPT_O 0x0040 /* OSPFv2 Opaque LSA (RFC 5250) */
#define OPT_AF 0x0100 /* OSPFv3 Address Families (RFC 5838) */
#define OPT_L_V3 0x0200 /* OSPFv3, link-local signaling */
#define OPT_AT 0x0400 /* OSPFv3, authentication trailer */
#define DBDES_IMMS (DBDES_I | DBDES_M | DBDES_MS)
-#define LSA_T_RT 0x2001
-#define LSA_T_NET 0x2002
-#define LSA_T_SUM_NET 0x2003
-#define LSA_T_SUM_RT 0x2004
-#define LSA_T_EXT 0x4005
-#define LSA_T_NSSA 0x2007
-#define LSA_T_LINK 0x0008
-#define LSA_T_PREFIX 0x2009
-
-#define LSA_T_V2_MASK 0x00ff
-
-#define LSA_UBIT 0x8000
-
-#define LSA_SCOPE_LINK 0x0000
-#define LSA_SCOPE_AREA 0x2000
-#define LSA_SCOPE_AS 0x4000
-#define LSA_SCOPE_RES 0x6000
-#define LSA_SCOPE_MASK 0x6000
-#define LSA_SCOPE(type) ((type) & LSA_SCOPE_MASK)
+/* OSPFv3 LSA Types / LSA Function Codes */
+/* https://www.iana.org/assignments/ospfv3-parameters/ospfv3-parameters.xhtml#ospfv3-parameters-3 */
+#define LSA_T_RT 0x2001
+#define LSA_T_NET 0x2002
+#define LSA_T_SUM_NET 0x2003
+#define LSA_T_SUM_RT 0x2004
+#define LSA_T_EXT 0x4005
+#define LSA_T_NSSA 0x2007
+#define LSA_T_LINK 0x0008
+#define LSA_T_PREFIX 0x2009
+#define LSA_T_RI_ 0x000C
+#define LSA_T_RI_LINK 0x800C
+#define LSA_T_RI_AREA 0xA00C
+#define LSA_T_RI_AS 0xC00C
+#define LSA_T_OPAQUE_ 0x1FFF
+#define LSA_T_OPAQUE_LINK 0x9FFF
+#define LSA_T_OPAQUE_AREA 0xBFFF
+#define LSA_T_OPAQUE_AS 0xDFFF
+
+#define LSA_T_V2_OPAQUE_ 0x0009
+#define LSA_T_V2_MASK 0x00ff
+
+/* OSPFv2 Opaque LSA Types */
+/* https://www.iana.org/assignments/ospf-opaque-types/ospf-opaque-types.xhtml#ospf-opaque-types-2 */
+#define LSA_OT_RI 0x04
+
+#define LSA_FUNCTION_MASK 0x1FFF
+#define LSA_FUNCTION(type) ((type) & LSA_FUNCTION_MASK)
+
+#define LSA_UBIT 0x8000
+
+#define LSA_SCOPE_LINK 0x0000
+#define LSA_SCOPE_AREA 0x2000
+#define LSA_SCOPE_AS 0x4000
+#define LSA_SCOPE_RES 0x6000
+#define LSA_SCOPE_MASK 0x6000
+#define LSA_SCOPE(type) ((type) & LSA_SCOPE_MASK)
+#define LSA_SCOPE_ORDER(type) (((type) >> 13) & 0x3)
#define LSA_MAXAGE 3600 /* 1 hour */
#define LSA_EXT2_TOS 0x7F000000
#define LSA_EXT2_EBIT 0x80000000
-#define LSA_EXT3_EBIT 0x4000000
-#define LSA_EXT3_FBIT 0x2000000
-#define LSA_EXT3_TBIT 0x1000000
+#define LSA_EXT3_EBIT 0x04000000
+#define LSA_EXT3_FBIT 0x02000000
+#define LSA_EXT3_TBIT 0x01000000
+
+/* OSPF Router Information (RI) TLVs */
+/* https://www.iana.org/assignments/ospf-parameters/ospf-parameters.xhtml#ri-tlv */
+#define LSA_RI_RIC 1
+#define LSA_RI_RFC 2
+
+/* OSPF Router Informational Capability Bits */
+/* https://www.iana.org/assignments/ospf-parameters/ospf-parameters.xhtml#router-informational-capability */
+#define LSA_RIC_GR_CAPABLE 0
+#define LSA_RIC_GR_HELPER 1
+#define LSA_RIC_STUB_ROUTER 2
struct ospf_lsa_header
u32 rest[];
};
+struct ospf_tlv
+{
+#ifdef CPU_BIG_ENDIAN
+ u16 type;
+ u16 length;
+#else
+ u16 length;
+ u16 type;
+#endif
+ u32 data[];
+};
+
static inline uint
lsa_net_count(struct ospf_lsa_header *lsa)
/*
* lsa.type_raw is initialized by ospf_hash_get() to OSPFv3 LSA type.
* lsa_set_options() implicitly converts it to OSPFv2 LSA type, assuming that
- * old type is just new type masked by 0xff. That is not universally true,
- * but it holds for all OSPFv2 types currently supported by BIRD.
+ * old type is just new type masked by 0xff. That holds for most OSPFv2 types,
+ * but we have to fix it for opaque LSAs.
*/
if (ospf_is_v2(p))
+ {
+ if (lsa_is_opaque(en->lsa_type))
+ en->lsa.type_raw = LSA_T_V2_OPAQUE_ + LSA_SCOPE_ORDER(en->lsa_type);
+
lsa_set_options(&en->lsa, lsa_opts);
+ }
mb_free(en->lsa_body);
en->lsa_body = lsa_body;
u16 lsa_blen = p->lsab_used;
u16 lsa_length = sizeof(struct ospf_lsa_header) + lsa_blen;
+ /* For OSPFv2 Opaque LSAs, LS ID consists of Opaque Type and Opaque ID */
+ if (ospf_is_v2(p) && lsa_is_opaque(lsa->type))
+ lsa->id |= (u32) lsa_get_opaque_type(lsa->type) << 24;
+
en = ospf_hash_get(p->gr, lsa->dom, lsa->id, p->router_id, lsa->type);
if (!SNODE_VALID(en))
ifa->pxn_lsa = ospf_originate_lsa(p, &lsa);
}
+
+/*
+ * Router Information LSA handling
+ * Type = LSA_T_RI_AREA, opaque type = LSA_OT_RI
+ */
+
+void
+ospf_add_ric_tlv(struct ospf_proto *p)
+{
+ struct ospf_tlv *ri = lsab_allocz(p, sizeof(struct ospf_tlv) + sizeof(u32));
+ ri->type = LSA_RI_RIC;
+ ri->length = sizeof(struct ospf_tlv) + sizeof(u32);
+
+ BIT32R_SET(ri->data, LSA_RIC_STUB_ROUTER);
+}
+
+void
+ospf_originate_ri_lsa(struct ospf_proto *p, struct ospf_area *oa)
+{
+ struct ospf_new_lsa lsa = {
+ .type = LSA_T_RI_AREA,
+ .dom = oa->areaid,
+ .id = p->instance_id
+ };
+
+ ospf_add_ric_tlv(p);
+
+ ospf_originate_lsa(p, &lsa);
+}
+
+
+/*
+ * Generic topology code
+ */
+
static inline int breaks_minlsinterval(struct top_hash_entry *en)
{ return en && (en->lsa.age < LSA_MAXAGE) && (lsa_inst_age(en) < MINLSINTERVAL); }
ospf_originate_rt_lsa(p, oa);
ospf_originate_prefix_rt_lsa(p, oa);
+ ospf_originate_ri_lsa(p, oa);
oa->update_rt_lsa = 0;
}
}
projects / thirdparty / bird.git / commitdiff
