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Real broadcast mode for OSPFv2.

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This commit is contained in:
Ondrej Zajicek 2012-05-14 11:47:41 +02:00
parent 0ec031f740
commit 95127cbbb7
9 changed files with 68 additions and 25 deletions
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11
doc/bird.sgml
View File

@ -1825,6 +1825,7 @@ protocol ospf <name> {
type [broadcast|bcast|pointopoint|ptp|
nonbroadcast|nbma|pointomultipoint|ptmp];
strict nonbroadcast <switch>;
real broadcast <switch>;
check link <switch>;
ecmp weight <num>;
authentication [none|simple|cryptographic];
@ -2058,6 +2059,16 @@ protocol ospf <name> {
If set, don't send hello to any undefined neighbor. This switch
is ignored on other than NBMA or PtMP networks. Default value is no.
<tag>real broadcast <m/switch/</tag>
In <cf/type broadcast/ or <cf/type ptp/ network
configuration, OSPF packets are sent as IP multicast
packets. This option changes the behavior to using
old-fashioned IP broadcast packets. This may be useful as a
workaround if IP multicast for some reason does not work or
does not work reliably. This is a non-standard option and
probably is not interoperable with other OSPF
implementations. Default value is no.
<tag>check link <M>switch</M></tag>
If set, a hardware link state (reported by OS) is taken into
consideration. When a link disappears (e.g. an ethernet cable is

3
proto/ospf/config.Y
View File

@ -130,7 +130,7 @@ CF_KEYWORDS(NONE, SIMPLE, AUTHENTICATION, STRICT, CRYPTOGRAPHIC)
CF_KEYWORDS(ELIGIBLE, POLL, NETWORKS, HIDDEN, VIRTUAL, CHECK, LINK)
CF_KEYWORDS(RX, BUFFER, LARGE, NORMAL, STUBNET, HIDDEN, SUMMARY, TAG, EXTERNAL)
CF_KEYWORDS(WAIT, DELAY, LSADB, ECMP, LIMIT, WEIGHT, NSSA, TRANSLATOR, STABILITY)
CF_KEYWORDS(GLOBAL, LSID, ROUTER, SELF, INSTANCE)
CF_KEYWORDS(GLOBAL, LSID, ROUTER, SELF, INSTANCE, REAL)
%type <t> opttext
%type <ld> lsadb_args
@ -287,6 +287,7 @@ ospf_iface_item:
| TYPE PTP { OSPF_PATT->type = OSPF_IT_PTP ; }
| TYPE POINTOMULTIPOINT { OSPF_PATT->type = OSPF_IT_PTMP ; }
| TYPE PTMP { OSPF_PATT->type = OSPF_IT_PTMP ; }
| REAL BROADCAST bool { OSPF_PATT->real_bcast = $3; if (OSPF_VERSION != 2) cf_error("Real broadcast option requires OSPFv2"); }
| TRANSMIT DELAY expr { OSPF_PATT->inftransdelay = $3 ; if (($3<=0) || ($3>65535)) cf_error("Transmit delay must be in range 1-65535"); }
| PRIORITY expr { OSPF_PATT->priority = $2 ; if (($2<0) || ($2>255)) cf_error("Priority must be in range 0-255"); }
| STRICT NONBROADCAST bool { OSPF_PATT->strictnbma = $3 ; }

2
proto/ospf/hello.c
View File

@ -303,7 +303,7 @@ ospf_hello_send(struct ospf_iface *ifa, int kind, struct ospf_neighbor *dirn)
{
case OSPF_IT_BCAST:
case OSPF_IT_PTP:
ospf_send_to(ifa, AllSPFRouters);
ospf_send_to_all(ifa);
break;
case OSPF_IT_NBMA:

44
proto/ospf/iface.c
View File

@ -120,13 +120,24 @@ ospf_sk_open(struct ospf_iface *ifa)
sk->saddr = ifa->addr->ip;
if ((ifa->type == OSPF_IT_BCAST) || (ifa->type == OSPF_IT_PTP))
{
sk->ttl = 1; /* Hack, this will affect just multicast packets */
if (ifa->cf->real_bcast)
{
ifa->all_routers = ifa->addr->brd;
if (sk_setup_multicast(sk) < 0)
goto err;
if (sk_set_broadcast(sk, 1) < 0)
goto err;
}
else
{
ifa->all_routers = AllSPFRouters;
sk->ttl = 1; /* Hack, this will affect just multicast packets */
if (sk_join_group(sk, AllSPFRouters) < 0)
goto err;
if (sk_setup_multicast(sk) < 0)
goto err;
if (sk_join_group(sk, ifa->all_routers) < 0)
goto err;
}
}
ifa->sk = sk;
@ -265,7 +276,7 @@ ospf_iface_chstate(struct ospf_iface *ifa, u8 state)
OSPF_TRACE(D_EVENTS, "Changing state of iface %s from %s to %s",
ifa->iface->name, ospf_is[oldstate], ospf_is[state]);
if ((ifa->type == OSPF_IT_BCAST) && ifa->sk)
if ((ifa->type == OSPF_IT_BCAST) && !ifa->cf->real_bcast && ifa->sk)
{
if ((state == OSPF_IS_BACKUP) || (state == OSPF_IS_DR))
ospf_sk_join_dr(ifa);
@ -536,6 +547,7 @@ ospf_iface_new(struct ospf_area *oa, struct ifa *addr, struct ospf_iface_patt *i
/* Check validity of interface type */
int old_type = ifa->type;
u32 if_multi_flag = ip->real_bcast ? IF_BROADCAST : IF_MULTICAST;
#ifdef OSPFv2
if ((ifa->type == OSPF_IT_BCAST) && (addr->flags & IA_PEER))
@ -545,10 +557,10 @@ ospf_iface_new(struct ospf_area *oa, struct ifa *addr, struct ospf_iface_patt *i
ifa->type = OSPF_IT_PTMP;
#endif
if ((ifa->type == OSPF_IT_BCAST) && !(iface->flags & IF_MULTICAST))
if ((ifa->type == OSPF_IT_BCAST) && !(iface->flags & if_multi_flag))
ifa->type = OSPF_IT_NBMA;
if ((ifa->type == OSPF_IT_PTP) && !(iface->flags & IF_MULTICAST))
if ((ifa->type == OSPF_IT_PTP) && !(iface->flags & if_multi_flag))
ifa->type = OSPF_IT_PTMP;
if (ifa->type != old_type)
@ -628,6 +640,9 @@ ospf_iface_reconfigure(struct ospf_iface *ifa, struct ospf_iface_patt *new)
if (ifa->stub != new_stub)
return 0;
if (new->real_bcast != ifa->cf->real_bcast)
return 0;
ifa->cf = new;
ifa->marked = 0;
@ -1099,11 +1114,15 @@ ospf_if_notify(struct proto *p, unsigned flags, struct iface *iface)
void
ospf_iface_info(struct ospf_iface *ifa)
{
char *strict = "";
char *more = "";
if (ifa->strictnbma &&
((ifa->type == OSPF_IT_NBMA) || (ifa->type == OSPF_IT_PTMP)))
strict = "(strict)";
more = " (strict)";
if (ifa->cf->real_bcast &&
((ifa->type == OSPF_IT_BCAST) || (ifa->type == OSPF_IT_PTP)))
more = " (real)";
if (ifa->type == OSPF_IT_VLINK)
{
@ -1124,11 +1143,10 @@ ospf_iface_info(struct ospf_iface *ifa)
#else /* OSPFv3 */
cli_msg(-1015, "Interface %s (IID %d)", ifa->iface->name, ifa->instance_id);
#endif
cli_msg(-1015, "\tType: %s %s", ospf_it[ifa->type], strict);
cli_msg(-1015, "\tType: %s%s", ospf_it[ifa->type], more);
cli_msg(-1015, "\tArea: %R (%u)", ifa->oa->areaid, ifa->oa->areaid);
}
cli_msg(-1015, "\tState: %s %s", ospf_is[ifa->state],
ifa->stub ? "(stub)" : "");
cli_msg(-1015, "\tState: %s%s", ospf_is[ifa->state], ifa->stub ? " (stub)" : "");
cli_msg(-1015, "\tPriority: %u", ifa->priority);
cli_msg(-1015, "\tCost: %u", ifa->cost);
if (ifa->oa->po->ecmp)

8
proto/ospf/lsack.c
View File

@ -97,7 +97,9 @@ ospf_lsack_send(struct ospf_neighbor *n, int queue)
if (ifa->type == OSPF_IT_BCAST)
{
if ((ifa->state == OSPF_IS_DR) || (ifa->state == OSPF_IS_BACKUP))
ospf_send_to(ifa, AllSPFRouters);
ospf_send_to_all(ifa);
else if (ifa->cf->real_bcast)
ospf_send_to_bdr(ifa);
else
ospf_send_to(ifa, AllDRouters);
}
@ -124,7 +126,9 @@ ospf_lsack_send(struct ospf_neighbor *n, int queue)
if (ifa->type == OSPF_IT_BCAST)
{
if ((ifa->state == OSPF_IS_DR) || (ifa->state == OSPF_IS_BACKUP))
ospf_send_to(ifa, AllSPFRouters);
ospf_send_to_all(ifa);
else if (ifa->cf->real_bcast)
ospf_send_to_bdr(ifa);
else
ospf_send_to(ifa, AllDRouters);
}

6
proto/ospf/lsupd.c
View File

@ -314,7 +314,9 @@ ospf_lsupd_flood(struct proto_ospf *po,
{
case OSPF_IT_BCAST:
if ((ifa->state == OSPF_IS_BACKUP) || (ifa->state == OSPF_IS_DR))
ospf_send_to(ifa, AllSPFRouters);
ospf_send_to_all(ifa);
else if (ifa->cf->real_bcast)
ospf_send_to_bdr(ifa);
else
ospf_send_to(ifa, AllDRouters);
break;
@ -327,7 +329,7 @@ ospf_lsupd_flood(struct proto_ospf *po,
break;
case OSPF_IT_PTP:
ospf_send_to(ifa, AllSPFRouters);
ospf_send_to_all(ifa);
break;
case OSPF_IT_PTMP:

12
proto/ospf/ospf.h
View File

@ -205,6 +205,7 @@ struct ospf_iface
bird_clock_t csn_use; /* Last time when packet with that CSN was sent */
#endif
ip_addr all_routers; /* */
ip_addr drip; /* Designated router */
ip_addr bdrip; /* Backup DR */
u32 drid;
@ -790,22 +791,23 @@ struct ospf_iface_patt
u32 deadc;
u32 deadint;
u32 inftransdelay;
u32 priority;
u32 strictnbma;
list nbma_list;
u32 priority;
u32 voa;
u32 vid;
u16 rxbuf;
u8 check_link;
u8 ecmp_weight;
#define OSPF_RXBUF_NORMAL 0
#define OSPF_RXBUF_LARGE 1
#define OSPF_RXBUF_MINSIZE 256 /* Minimal allowed size */
u32 autype; /* Not really used in OSPFv3 */
u16 autype; /* Not really used in OSPFv3 */
#define OSPF_AUTH_NONE 0
#define OSPF_AUTH_SIMPLE 1
#define OSPF_AUTH_CRYPT 2
#define OSPF_AUTH_CRYPT_SIZE 16
u8 strictnbma;
u8 check_link;
u8 ecmp_weight;
u8 real_bcast; /* Not really used in OSPFv3 */
#ifdef OSPFv2
list *passwords;

5
proto/ospf/packet.c
View File

@ -273,7 +273,7 @@ ospf_rx_hook(sock *sk, int size)
int src_local, dst_local UNUSED, dst_mcast;
src_local = ipa_in_net(sk->faddr, ifa->addr->prefix, ifa->addr->pxlen);
dst_local = ipa_equal(sk->laddr, ifa->addr->ip);
dst_mcast = ipa_equal(sk->laddr, AllSPFRouters) || ipa_equal(sk->laddr, AllDRouters);
dst_mcast = ipa_equal(sk->laddr, ifa->all_routers) || ipa_equal(sk->laddr, AllDRouters);
#ifdef OSPFv2
/* First, we eliminate packets with strange address combinations.
@ -287,6 +287,9 @@ ospf_rx_hook(sock *sk, int size)
if (!dst_mcast && !dst_local)
return 1;
/* Ignore my own broadcast packets */
if (ifa->cf->real_bcast && ipa_equal(sk->faddr, ifa->addr->ip))
return 1;
#else /* OSPFv3 */
/* In OSPFv3, src_local and dst_local mean link-local.

2
proto/ospf/packet.h
View File

@ -19,6 +19,8 @@ void ospf_send_to_agt(struct ospf_iface *ifa, u8 state);
void ospf_send_to_bdr(struct ospf_iface *ifa);
void ospf_send_to(struct ospf_iface *ifa, ip_addr ip);
static inline void ospf_send_to_all(struct ospf_iface *ifa) { ospf_send_to(ifa, ifa->all_routers); }
static inline void * ospf_tx_buffer(struct ospf_iface *ifa) { return ifa->sk->tbuf; }
static inline unsigned